net/core/filter.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Linux Socket Filter - Kernel level socket filtering
   4  *
   5  * Based on the design of the Berkeley Packet Filter. The new
   6  * internal format has been designed by PLUMgrid:
   7  *
   8  *      Copyright (c) 2011 - 2014 PLUMgrid, http://plumgrid.com
   9  *
  10  * Authors:
  11  *
  12  *      Jay Schulist <jschlst@samba.org>
  13  *      Alexei Starovoitov <ast@plumgrid.com>
  14  *      Daniel Borkmann <dborkman@redhat.com>
  15  *
  16  * Andi Kleen - Fix a few bad bugs and races.
  17  * Kris Katterjohn - Added many additional checks in bpf_check_classic()
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/mm.h>
  23 #include <linux/fcntl.h>
  24 #include <linux/socket.h>
  25 #include <linux/sock_diag.h>
  26 #include <linux/in.h>
  27 #include <linux/inet.h>
  28 #include <linux/netdevice.h>
  29 #include <linux/if_packet.h>
  30 #include <linux/if_arp.h>
  31 #include <linux/gfp.h>
  32 #include <net/inet_common.h>
  33 #include <net/ip.h>
  34 #include <net/protocol.h>
  35 #include <net/netlink.h>
  36 #include <linux/skbuff.h>
  37 #include <linux/skmsg.h>
  38 #include <net/sock.h>
  39 #include <net/flow_dissector.h>
  40 #include <linux/errno.h>
  41 #include <linux/timer.h>
  42 #include <linux/uaccess.h>
  43 #include <asm/unaligned.h>
  44 #include <asm/cmpxchg.h>
  45 #include <linux/filter.h>
  46 #include <linux/ratelimit.h>
  47 #include <linux/seccomp.h>
  48 #include <linux/if_vlan.h>
  49 #include <linux/bpf.h>
  50 #include <linux/btf.h>
  51 #include <net/sch_generic.h>
  52 #include <net/cls_cgroup.h>
  53 #include <net/dst_metadata.h>
  54 #include <net/dst.h>
  55 #include <net/sock_reuseport.h>
  56 #include <net/busy_poll.h>
  57 #include <net/tcp.h>
  58 #include <net/xfrm.h>
  59 #include <net/udp.h>
  60 #include <linux/bpf_trace.h>
  61 #include <net/xdp_sock.h>
  62 #include <linux/inetdevice.h>
  63 #include <net/inet_hashtables.h>
  64 #include <net/inet6_hashtables.h>
  65 #include <net/ip_fib.h>
  66 #include <net/nexthop.h>
  67 #include <net/flow.h>
  68 #include <net/arp.h>
  69 #include <net/ipv6.h>
  70 #include <net/net_namespace.h>
  71 #include <linux/seg6_local.h>
  72 #include <net/seg6.h>
  73 #include <net/seg6_local.h>
  74 #include <net/lwtunnel.h>
  75 #include <net/ipv6_stubs.h>
  76 #include <net/bpf_sk_storage.h>
  77 #include <net/transp_v6.h>
  78 #include <linux/btf_ids.h>
  79 #include <net/tls.h>
  80
  81 static const struct bpf_func_proto *
  82 bpf_sk_base_func_proto(enum bpf_func_id func_id);
  83
  84 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len)
  85 {
  86         if (in_compat_syscall()) {
  87                 struct compat_sock_fprog f32;
  88
  89                 if (len != sizeof(f32))
  90                         return -EINVAL;
  91                 if (copy_from_sockptr(&f32, src, sizeof(f32)))
  92                         return -EFAULT;
  93                 memset(dst, 0, sizeof(*dst));
  94                 dst->len = f32.len;
  95                 dst->filter = compat_ptr(f32.filter);
  96         } else {
  97                 if (len != sizeof(*dst))
  98                         return -EINVAL;
  99                 if (copy_from_sockptr(dst, src, sizeof(*dst)))
 100                         return -EFAULT;
 101         }
 102
 103         return 0;
 104 }
 105 EXPORT_SYMBOL_GPL(copy_bpf_fprog_from_user);
 106
 107 /**
 108  *      sk_filter_trim_cap - run a packet through a socket filter
 109  *      @sk: sock associated with &sk_buff
 110  *      @skb: buffer to filter
 111  *      @cap: limit on how short the eBPF program may trim the packet
 112  *
 113  * Run the eBPF program and then cut skb->data to correct size returned by
 114  * the program. If pkt_len is 0 we toss packet. If skb->len is smaller
 115  * than pkt_len we keep whole skb->data. This is the socket level
 116  * wrapper to BPF_PROG_RUN. It returns 0 if the packet should
 117  * be accepted or -EPERM if the packet should be tossed.
 118  *
 119  */
 120 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap)
 121 {
 122         int err;
 123         struct sk_filter *filter;
 124
 125         /*
 126          * If the skb was allocated from pfmemalloc reserves, only
 127          * allow SOCK_MEMALLOC sockets to use it as this socket is
 128          * helping free memory
 129          */
 130         if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC)) {
 131                 NET_INC_STATS(sock_net(sk), LINUX_MIB_PFMEMALLOCDROP);
 132                 return -ENOMEM;
 133         }
 134         err = BPF_CGROUP_RUN_PROG_INET_INGRESS(sk, skb);
 135         if (err)
 136                 return err;
 137
 138         err = security_sock_rcv_skb(sk, skb);
 139         if (err)
 140                 return err;
 141
 142         rcu_read_lock();
 143         filter = rcu_dereference(sk->sk_filter);
 144         if (filter) {
 145                 struct sock *save_sk = skb->sk;
 146                 unsigned int pkt_len;
 147
 148                 skb->sk = sk;
 149                 pkt_len = bpf_prog_run_save_cb(filter->prog, skb);
 150                 skb->sk = save_sk;
 151                 err = pkt_len ? pskb_trim(skb, max(cap, pkt_len)) : -EPERM;
 152         }
 153         rcu_read_unlock();
 154
 155         return err;
 156 }
 157 EXPORT_SYMBOL(sk_filter_trim_cap);
 158
 159 BPF_CALL_1(bpf_skb_get_pay_offset, struct sk_buff *, skb)
 160 {
 161         return skb_get_poff(skb);
 162 }
 163
 164 BPF_CALL_3(bpf_skb_get_nlattr, struct sk_buff *, skb, u32, a, u32, x)
 165 {
 166         struct nlattr *nla;
 167
 168         if (skb_is_nonlinear(skb))
 169                 return 0;
 170
 171         if (skb->len < sizeof(struct nlattr))
 172                 return 0;
 173
 174         if (a > skb->len - sizeof(struct nlattr))
 175                 return 0;
 176
 177         nla = nla_find((struct nlattr *) &skb->data[a], skb->len - a, x);
 178         if (nla)
 179                 return (void *) nla - (void *) skb->data;
 180
 181         return 0;
 182 }
 183
 184 BPF_CALL_3(bpf_skb_get_nlattr_nest, struct sk_buff *, skb, u32, a, u32, x)
 185 {
 186         struct nlattr *nla;
 187
 188         if (skb_is_nonlinear(skb))
 189                 return 0;
 190
 191         if (skb->len < sizeof(struct nlattr))
 192                 return 0;
 193
 194         if (a > skb->len - sizeof(struct nlattr))
 195                 return 0;
 196
 197         nla = (struct nlattr *) &skb->data[a];
 198         if (nla->nla_len > skb->len - a)
 199                 return 0;
 200
 201         nla = nla_find_nested(nla, x);
 202         if (nla)
 203                 return (void *) nla - (void *) skb->data;
 204
 205         return 0;
 206 }
 207
 208 BPF_CALL_4(bpf_skb_load_helper_8, const struct sk_buff *, skb, const void *,
 209            data, int, headlen, int, offset)
 210 {
 211         u8 tmp, *ptr;
 212         const int len = sizeof(tmp);
 213
 214         if (offset >= 0) {
 215                 if (headlen - offset >= len)
 216                         return *(u8 *)(data + offset);
 217                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 218                         return tmp;
 219         } else {
 220                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 221                 if (likely(ptr))
 222                         return *(u8 *)ptr;
 223         }
 224
 225         return -EFAULT;
 226 }
 227
 228 BPF_CALL_2(bpf_skb_load_helper_8_no_cache, const struct sk_buff *, skb,
 229            int, offset)
 230 {
 231         return ____bpf_skb_load_helper_8(skb, skb->data, skb->len - skb->data_len,
 232                                          offset);
 233 }
 234
 235 BPF_CALL_4(bpf_skb_load_helper_16, const struct sk_buff *, skb, const void *,
 236            data, int, headlen, int, offset)
 237 {
 238         u16 tmp, *ptr;
 239         const int len = sizeof(tmp);
 240
 241         if (offset >= 0) {
 242                 if (headlen - offset >= len)
 243                         return get_unaligned_be16(data + offset);
 244                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 245                         return be16_to_cpu(tmp);
 246         } else {
 247                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 248                 if (likely(ptr))
 249                         return get_unaligned_be16(ptr);
 250         }
 251
 252         return -EFAULT;
 253 }
 254
 255 BPF_CALL_2(bpf_skb_load_helper_16_no_cache, const struct sk_buff *, skb,
 256            int, offset)
 257 {
 258         return ____bpf_skb_load_helper_16(skb, skb->data, skb->len - skb->data_len,
 259                                           offset);
 260 }
 261
 262 BPF_CALL_4(bpf_skb_load_helper_32, const struct sk_buff *, skb, const void *,
 263            data, int, headlen, int, offset)
 264 {
 265         u32 tmp, *ptr;
 266         const int len = sizeof(tmp);
 267
 268         if (likely(offset >= 0)) {
 269                 if (headlen - offset >= len)
 270                         return get_unaligned_be32(data + offset);
 271                 if (!skb_copy_bits(skb, offset, &tmp, sizeof(tmp)))
 272                         return be32_to_cpu(tmp);
 273         } else {
 274                 ptr = bpf_internal_load_pointer_neg_helper(skb, offset, len);
 275                 if (likely(ptr))
 276                         return get_unaligned_be32(ptr);
 277         }
 278
 279         return -EFAULT;
 280 }
 281
 282 BPF_CALL_2(bpf_skb_load_helper_32_no_cache, const struct sk_buff *, skb,
 283            int, offset)
 284 {
 285         return ____bpf_skb_load_helper_32(skb, skb->data, skb->len - skb->data_len,
 286                                           offset);
 287 }
 288
 289 static u32 convert_skb_access(int skb_field, int dst_reg, int src_reg,
 290                               struct bpf_insn *insn_buf)
 291 {
 292         struct bpf_insn *insn = insn_buf;
 293
 294         switch (skb_field) {
 295         case SKF_AD_MARK:
 296                 BUILD_BUG_ON(sizeof_field(struct sk_buff, mark) != 4);
 297
 298                 *insn++ = BPF_LDX_MEM(BPF_W, dst_reg, src_reg,
 299                                       offsetof(struct sk_buff, mark));
 300                 break;
 301
 302         case SKF_AD_PKTTYPE:
 303                 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_TYPE_OFFSET());
 304                 *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, PKT_TYPE_MAX);
 305 #ifdef __BIG_ENDIAN_BITFIELD
 306                 *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, 5);
 307 #endif
 308                 break;
 309
 310         case SKF_AD_QUEUE:
 311                 BUILD_BUG_ON(sizeof_field(struct sk_buff, queue_mapping) != 2);
 312
 313                 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
 314                                       offsetof(struct sk_buff, queue_mapping));
 315                 break;
 316
 317         case SKF_AD_VLAN_TAG:
 318                 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_tci) != 2);
 319
 320                 /* dst_reg = *(u16 *) (src_reg + offsetof(vlan_tci)) */
 321                 *insn++ = BPF_LDX_MEM(BPF_H, dst_reg, src_reg,
 322                                       offsetof(struct sk_buff, vlan_tci));
 323                 break;
 324         case SKF_AD_VLAN_TAG_PRESENT:
 325                 *insn++ = BPF_LDX_MEM(BPF_B, dst_reg, src_reg, PKT_VLAN_PRESENT_OFFSET());
 326                 if (PKT_VLAN_PRESENT_BIT)
 327                         *insn++ = BPF_ALU32_IMM(BPF_RSH, dst_reg, PKT_VLAN_PRESENT_BIT);
 328                 if (PKT_VLAN_PRESENT_BIT < 7)
 329                         *insn++ = BPF_ALU32_IMM(BPF_AND, dst_reg, 1);
 330                 break;
 331         }
 332
 333         return insn - insn_buf;
 334 }
 335
 336 static bool convert_bpf_extensions(struct sock_filter *fp,
 337                                    struct bpf_insn **insnp)
 338 {
 339         struct bpf_insn *insn = *insnp;
 340         u32 cnt;
 341
 342         switch (fp->k) {
 343         case SKF_AD_OFF + SKF_AD_PROTOCOL:
 344                 BUILD_BUG_ON(sizeof_field(struct sk_buff, protocol) != 2);
 345
 346                 /* A = *(u16 *) (CTX + offsetof(protocol)) */
 347                 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
 348                                       offsetof(struct sk_buff, protocol));
 349                 /* A = ntohs(A) [emitting a nop or swap16] */
 350                 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
 351                 break;
 352
 353         case SKF_AD_OFF + SKF_AD_PKTTYPE:
 354                 cnt = convert_skb_access(SKF_AD_PKTTYPE, BPF_REG_A, BPF_REG_CTX, insn);
 355                 insn += cnt - 1;
 356                 break;
 357
 358         case SKF_AD_OFF + SKF_AD_IFINDEX:
 359         case SKF_AD_OFF + SKF_AD_HATYPE:
 360                 BUILD_BUG_ON(sizeof_field(struct net_device, ifindex) != 4);
 361                 BUILD_BUG_ON(sizeof_field(struct net_device, type) != 2);
 362
 363                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
 364                                       BPF_REG_TMP, BPF_REG_CTX,
 365                                       offsetof(struct sk_buff, dev));
 366                 /* if (tmp != 0) goto pc + 1 */
 367                 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_TMP, 0, 1);
 368                 *insn++ = BPF_EXIT_INSN();
 369                 if (fp->k == SKF_AD_OFF + SKF_AD_IFINDEX)
 370                         *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_TMP,
 371                                             offsetof(struct net_device, ifindex));
 372                 else
 373                         *insn = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_TMP,
 374                                             offsetof(struct net_device, type));
 375                 break;
 376
 377         case SKF_AD_OFF + SKF_AD_MARK:
 378                 cnt = convert_skb_access(SKF_AD_MARK, BPF_REG_A, BPF_REG_CTX, insn);
 379                 insn += cnt - 1;
 380                 break;
 381
 382         case SKF_AD_OFF + SKF_AD_RXHASH:
 383                 BUILD_BUG_ON(sizeof_field(struct sk_buff, hash) != 4);
 384
 385                 *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX,
 386                                     offsetof(struct sk_buff, hash));
 387                 break;
 388
 389         case SKF_AD_OFF + SKF_AD_QUEUE:
 390                 cnt = convert_skb_access(SKF_AD_QUEUE, BPF_REG_A, BPF_REG_CTX, insn);
 391                 insn += cnt - 1;
 392                 break;
 393
 394         case SKF_AD_OFF + SKF_AD_VLAN_TAG:
 395                 cnt = convert_skb_access(SKF_AD_VLAN_TAG,
 396                                          BPF_REG_A, BPF_REG_CTX, insn);
 397                 insn += cnt - 1;
 398                 break;
 399
 400         case SKF_AD_OFF + SKF_AD_VLAN_TAG_PRESENT:
 401                 cnt = convert_skb_access(SKF_AD_VLAN_TAG_PRESENT,
 402                                          BPF_REG_A, BPF_REG_CTX, insn);
 403                 insn += cnt - 1;
 404                 break;
 405
 406         case SKF_AD_OFF + SKF_AD_VLAN_TPID:
 407                 BUILD_BUG_ON(sizeof_field(struct sk_buff, vlan_proto) != 2);
 408
 409                 /* A = *(u16 *) (CTX + offsetof(vlan_proto)) */
 410                 *insn++ = BPF_LDX_MEM(BPF_H, BPF_REG_A, BPF_REG_CTX,
 411                                       offsetof(struct sk_buff, vlan_proto));
 412                 /* A = ntohs(A) [emitting a nop or swap16] */
 413                 *insn = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, 16);
 414                 break;
 415
 416         case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
 417         case SKF_AD_OFF + SKF_AD_NLATTR:
 418         case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
 419         case SKF_AD_OFF + SKF_AD_CPU:
 420         case SKF_AD_OFF + SKF_AD_RANDOM:
 421                 /* arg1 = CTX */
 422                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
 423                 /* arg2 = A */
 424                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_A);
 425                 /* arg3 = X */
 426                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_X);
 427                 /* Emit call(arg1=CTX, arg2=A, arg3=X) */
 428                 switch (fp->k) {
 429                 case SKF_AD_OFF + SKF_AD_PAY_OFFSET:
 430                         *insn = BPF_EMIT_CALL(bpf_skb_get_pay_offset);
 431                         break;
 432                 case SKF_AD_OFF + SKF_AD_NLATTR:
 433                         *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr);
 434                         break;
 435                 case SKF_AD_OFF + SKF_AD_NLATTR_NEST:
 436                         *insn = BPF_EMIT_CALL(bpf_skb_get_nlattr_nest);
 437                         break;
 438                 case SKF_AD_OFF + SKF_AD_CPU:
 439                         *insn = BPF_EMIT_CALL(bpf_get_raw_cpu_id);
 440                         break;
 441                 case SKF_AD_OFF + SKF_AD_RANDOM:
 442                         *insn = BPF_EMIT_CALL(bpf_user_rnd_u32);
 443                         bpf_user_rnd_init_once();
 444                         break;
 445                 }
 446                 break;
 447
 448         case SKF_AD_OFF + SKF_AD_ALU_XOR_X:
 449                 /* A ^= X */
 450                 *insn = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_X);
 451                 break;
 452
 453         default:
 454                 /* This is just a dummy call to avoid letting the compiler
 455                  * evict __bpf_call_base() as an optimization. Placed here
 456                  * where no-one bothers.
 457                  */
 458                 BUG_ON(__bpf_call_base(0, 0, 0, 0, 0) != 0);
 459                 return false;
 460         }
 461
 462         *insnp = insn;
 463         return true;
 464 }
 465
 466 static bool convert_bpf_ld_abs(struct sock_filter *fp, struct bpf_insn **insnp)
 467 {
 468         const bool unaligned_ok = IS_BUILTIN(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS);
 469         int size = bpf_size_to_bytes(BPF_SIZE(fp->code));
 470         bool endian = BPF_SIZE(fp->code) == BPF_H ||
 471                       BPF_SIZE(fp->code) == BPF_W;
 472         bool indirect = BPF_MODE(fp->code) == BPF_IND;
 473         const int ip_align = NET_IP_ALIGN;
 474         struct bpf_insn *insn = *insnp;
 475         int offset = fp->k;
 476
 477         if (!indirect &&
 478             ((unaligned_ok && offset >= 0) ||
 479              (!unaligned_ok && offset >= 0 &&
 480               offset + ip_align >= 0 &&
 481               offset + ip_align % size == 0))) {
 482                 bool ldx_off_ok = offset <= S16_MAX;
 483
 484                 *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_H);
 485                 if (offset)
 486                         *insn++ = BPF_ALU64_IMM(BPF_SUB, BPF_REG_TMP, offset);
 487                 *insn++ = BPF_JMP_IMM(BPF_JSLT, BPF_REG_TMP,
 488                                       size, 2 + endian + (!ldx_off_ok * 2));
 489                 if (ldx_off_ok) {
 490                         *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
 491                                               BPF_REG_D, offset);
 492                 } else {
 493                         *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_D);
 494                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_TMP, offset);
 495                         *insn++ = BPF_LDX_MEM(BPF_SIZE(fp->code), BPF_REG_A,
 496                                               BPF_REG_TMP, 0);
 497                 }
 498                 if (endian)
 499                         *insn++ = BPF_ENDIAN(BPF_FROM_BE, BPF_REG_A, size * 8);
 500                 *insn++ = BPF_JMP_A(8);
 501         }
 502
 503         *insn++ = BPF_MOV64_REG(BPF_REG_ARG1, BPF_REG_CTX);
 504         *insn++ = BPF_MOV64_REG(BPF_REG_ARG2, BPF_REG_D);
 505         *insn++ = BPF_MOV64_REG(BPF_REG_ARG3, BPF_REG_H);
 506         if (!indirect) {
 507                 *insn++ = BPF_MOV64_IMM(BPF_REG_ARG4, offset);
 508         } else {
 509                 *insn++ = BPF_MOV64_REG(BPF_REG_ARG4, BPF_REG_X);
 510                 if (fp->k)
 511                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_ARG4, offset);
 512         }
 513
 514         switch (BPF_SIZE(fp->code)) {
 515         case BPF_B:
 516                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8);
 517                 break;
 518         case BPF_H:
 519                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16);
 520                 break;
 521         case BPF_W:
 522                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32);
 523                 break;
 524         default:
 525                 return false;
 526         }
 527
 528         *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_A, 0, 2);
 529         *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 530         *insn   = BPF_EXIT_INSN();
 531
 532         *insnp = insn;
 533         return true;
 534 }
 535
 536 /**
 537  *      bpf_convert_filter - convert filter program
 538  *      @prog: the user passed filter program
 539  *      @len: the length of the user passed filter program
 540  *      @new_prog: allocated 'struct bpf_prog' or NULL
 541  *      @new_len: pointer to store length of converted program
 542  *      @seen_ld_abs: bool whether we've seen ld_abs/ind
 543  *
 544  * Remap 'sock_filter' style classic BPF (cBPF) instruction set to 'bpf_insn'
 545  * style extended BPF (eBPF).
 546  * Conversion workflow:
 547  *
 548  * 1) First pass for calculating the new program length:
 549  *   bpf_convert_filter(old_prog, old_len, NULL, &new_len, &seen_ld_abs)
 550  *
 551  * 2) 2nd pass to remap in two passes: 1st pass finds new
 552  *    jump offsets, 2nd pass remapping:
 553  *   bpf_convert_filter(old_prog, old_len, new_prog, &new_len, &seen_ld_abs)
 554  */
 555 static int bpf_convert_filter(struct sock_filter *prog, int len,
 556                               struct bpf_prog *new_prog, int *new_len,
 557                               bool *seen_ld_abs)
 558 {
 559         int new_flen = 0, pass = 0, target, i, stack_off;
 560         struct bpf_insn *new_insn, *first_insn = NULL;
 561         struct sock_filter *fp;
 562         int *addrs = NULL;
 563         u8 bpf_src;
 564
 565         BUILD_BUG_ON(BPF_MEMWORDS * sizeof(u32) > MAX_BPF_STACK);
 566         BUILD_BUG_ON(BPF_REG_FP + 1 != MAX_BPF_REG);
 567
 568         if (len <= 0 || len > BPF_MAXINSNS)
 569                 return -EINVAL;
 570
 571         if (new_prog) {
 572                 first_insn = new_prog->insnsi;
 573                 addrs = kcalloc(len, sizeof(*addrs),
 574                                 GFP_KERNEL | __GFP_NOWARN);
 575                 if (!addrs)
 576                         return -ENOMEM;
 577         }
 578
 579 do_pass:
 580         new_insn = first_insn;
 581         fp = prog;
 582
 583         /* Classic BPF related prologue emission. */
 584         if (new_prog) {
 585                 /* Classic BPF expects A and X to be reset first. These need
 586                  * to be guaranteed to be the first two instructions.
 587                  */
 588                 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 589                 *new_insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_X, BPF_REG_X);
 590
 591                 /* All programs must keep CTX in callee saved BPF_REG_CTX.
 592                  * In eBPF case it's done by the compiler, here we need to
 593                  * do this ourself. Initial CTX is present in BPF_REG_ARG1.
 594                  */
 595                 *new_insn++ = BPF_MOV64_REG(BPF_REG_CTX, BPF_REG_ARG1);
 596                 if (*seen_ld_abs) {
 597                         /* For packet access in classic BPF, cache skb->data
 598                          * in callee-saved BPF R8 and skb->len - skb->data_len
 599                          * (headlen) in BPF R9. Since classic BPF is read-only
 600                          * on CTX, we only need to cache it once.
 601                          */
 602                         *new_insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
 603                                                   BPF_REG_D, BPF_REG_CTX,
 604                                                   offsetof(struct sk_buff, data));
 605                         *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_H, BPF_REG_CTX,
 606                                                   offsetof(struct sk_buff, len));
 607                         *new_insn++ = BPF_LDX_MEM(BPF_W, BPF_REG_TMP, BPF_REG_CTX,
 608                                                   offsetof(struct sk_buff, data_len));
 609                         *new_insn++ = BPF_ALU32_REG(BPF_SUB, BPF_REG_H, BPF_REG_TMP);
 610                 }
 611         } else {
 612                 new_insn += 3;
 613         }
 614
 615         for (i = 0; i < len; fp++, i++) {
 616                 struct bpf_insn tmp_insns[32] = { };
 617                 struct bpf_insn *insn = tmp_insns;
 618
 619                 if (addrs)
 620                         addrs[i] = new_insn - first_insn;
 621
 622                 switch (fp->code) {
 623                 /* All arithmetic insns and skb loads map as-is. */
 624                 case BPF_ALU | BPF_ADD | BPF_X:
 625                 case BPF_ALU | BPF_ADD | BPF_K:
 626                 case BPF_ALU | BPF_SUB | BPF_X:
 627                 case BPF_ALU | BPF_SUB | BPF_K:
 628                 case BPF_ALU | BPF_AND | BPF_X:
 629                 case BPF_ALU | BPF_AND | BPF_K:
 630                 case BPF_ALU | BPF_OR | BPF_X:
 631                 case BPF_ALU | BPF_OR | BPF_K:
 632                 case BPF_ALU | BPF_LSH | BPF_X:
 633                 case BPF_ALU | BPF_LSH | BPF_K:
 634                 case BPF_ALU | BPF_RSH | BPF_X:
 635                 case BPF_ALU | BPF_RSH | BPF_K:
 636                 case BPF_ALU | BPF_XOR | BPF_X:
 637                 case BPF_ALU | BPF_XOR | BPF_K:
 638                 case BPF_ALU | BPF_MUL | BPF_X:
 639                 case BPF_ALU | BPF_MUL | BPF_K:
 640                 case BPF_ALU | BPF_DIV | BPF_X:
 641                 case BPF_ALU | BPF_DIV | BPF_K:
 642                 case BPF_ALU | BPF_MOD | BPF_X:
 643                 case BPF_ALU | BPF_MOD | BPF_K:
 644                 case BPF_ALU | BPF_NEG:
 645                 case BPF_LD | BPF_ABS | BPF_W:
 646                 case BPF_LD | BPF_ABS | BPF_H:
 647                 case BPF_LD | BPF_ABS | BPF_B:
 648                 case BPF_LD | BPF_IND | BPF_W:
 649                 case BPF_LD | BPF_IND | BPF_H:
 650                 case BPF_LD | BPF_IND | BPF_B:
 651                         /* Check for overloaded BPF extension and
 652                          * directly convert it if found, otherwise
 653                          * just move on with mapping.
 654                          */
 655                         if (BPF_CLASS(fp->code) == BPF_LD &&
 656                             BPF_MODE(fp->code) == BPF_ABS &&
 657                             convert_bpf_extensions(fp, &insn))
 658                                 break;
 659                         if (BPF_CLASS(fp->code) == BPF_LD &&
 660                             convert_bpf_ld_abs(fp, &insn)) {
 661                                 *seen_ld_abs = true;
 662                                 break;
 663                         }
 664
 665                         if (fp->code == (BPF_ALU | BPF_DIV | BPF_X) ||
 666                             fp->code == (BPF_ALU | BPF_MOD | BPF_X)) {
 667                                 *insn++ = BPF_MOV32_REG(BPF_REG_X, BPF_REG_X);
 668                                 /* Error with exception code on div/mod by 0.
 669                                  * For cBPF programs, this was always return 0.
 670                                  */
 671                                 *insn++ = BPF_JMP_IMM(BPF_JNE, BPF_REG_X, 0, 2);
 672                                 *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_A, BPF_REG_A);
 673                                 *insn++ = BPF_EXIT_INSN();
 674                         }
 675
 676                         *insn = BPF_RAW_INSN(fp->code, BPF_REG_A, BPF_REG_X, 0, fp->k);
 677                         break;
 678
 679                 /* Jump transformation cannot use BPF block macros
 680                  * everywhere as offset calculation and target updates
 681                  * require a bit more work than the rest, i.e. jump
 682                  * opcodes map as-is, but offsets need adjustment.
 683                  */
 684
 685 #define BPF_EMIT_JMP                                                    \
 686         do {                                                            \
 687                 const s32 off_min = S16_MIN, off_max = S16_MAX;         \
 688                 s32 off;                                                \
 689                                                                         \
 690                 if (target >= len || target < 0)                        \
 691                         goto err;                                       \
 692                 off = addrs ? addrs[target] - addrs[i] - 1 : 0;         \
 693                 /* Adjust pc relative offset for 2nd or 3rd insn. */    \
 694                 off -= insn - tmp_insns;                                \
 695                 /* Reject anything not fitting into insn->off. */       \
 696                 if (off < off_min || off > off_max)                     \
 697                         goto err;                                       \
 698                 insn->off = off;                                        \
 699         } while (0)
 700
 701                 case BPF_JMP | BPF_JA:
 702                         target = i + fp->k + 1;
 703                         insn->code = fp->code;
 704                         BPF_EMIT_JMP;
 705                         break;
 706
 707                 case BPF_JMP | BPF_JEQ | BPF_K:
 708                 case BPF_JMP | BPF_JEQ | BPF_X:
 709                 case BPF_JMP | BPF_JSET | BPF_K:
 710                 case BPF_JMP | BPF_JSET | BPF_X:
 711                 case BPF_JMP | BPF_JGT | BPF_K:
 712                 case BPF_JMP | BPF_JGT | BPF_X:
 713                 case BPF_JMP | BPF_JGE | BPF_K:
 714                 case BPF_JMP | BPF_JGE | BPF_X:
 715                         if (BPF_SRC(fp->code) == BPF_K && (int) fp->k < 0) {
 716                                 /* BPF immediates are signed, zero extend
 717                                  * immediate into tmp register and use it
 718                                  * in compare insn.
 719                                  */
 720                                 *insn++ = BPF_MOV32_IMM(BPF_REG_TMP, fp->k);
 721
 722                                 insn->dst_reg = BPF_REG_A;
 723                                 insn->src_reg = BPF_REG_TMP;
 724                                 bpf_src = BPF_X;
 725                         } else {
 726                                 insn->dst_reg = BPF_REG_A;
 727                                 insn->imm = fp->k;
 728                                 bpf_src = BPF_SRC(fp->code);
 729                                 insn->src_reg = bpf_src == BPF_X ? BPF_REG_X : 0;
 730                         }
 731
 732                         /* Common case where 'jump_false' is next insn. */
 733                         if (fp->jf == 0) {
 734                                 insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
 735                                 target = i + fp->jt + 1;
 736                                 BPF_EMIT_JMP;
 737                                 break;
 738                         }
 739
 740                         /* Convert some jumps when 'jump_true' is next insn. */
 741                         if (fp->jt == 0) {
 742                                 switch (BPF_OP(fp->code)) {
 743                                 case BPF_JEQ:
 744                                         insn->code = BPF_JMP | BPF_JNE | bpf_src;
 745                                         break;
 746                                 case BPF_JGT:
 747                                         insn->code = BPF_JMP | BPF_JLE | bpf_src;
 748                                         break;
 749                                 case BPF_JGE:
 750                                         insn->code = BPF_JMP | BPF_JLT | bpf_src;
 751                                         break;
 752                                 default:
 753                                         goto jmp_rest;
 754                                 }
 755
 756                                 target = i + fp->jf + 1;
 757                                 BPF_EMIT_JMP;
 758                                 break;
 759                         }
 760 jmp_rest:
 761                         /* Other jumps are mapped into two insns: Jxx and JA. */
 762                         target = i + fp->jt + 1;
 763                         insn->code = BPF_JMP | BPF_OP(fp->code) | bpf_src;
 764                         BPF_EMIT_JMP;
 765                         insn++;
 766
 767                         insn->code = BPF_JMP | BPF_JA;
 768                         target = i + fp->jf + 1;
 769                         BPF_EMIT_JMP;
 770                         break;
 771
 772                 /* ldxb 4 * ([14] & 0xf) is remaped into 6 insns. */
 773                 case BPF_LDX | BPF_MSH | BPF_B: {
 774                         struct sock_filter tmp = {
 775                                 .code   = BPF_LD | BPF_ABS | BPF_B,
 776                                 .k      = fp->k,
 777                         };
 778
 779                         *seen_ld_abs = true;
 780
 781                         /* X = A */
 782                         *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 783                         /* A = BPF_R0 = *(u8 *) (skb->data + K) */
 784                         convert_bpf_ld_abs(&tmp, &insn);
 785                         insn++;
 786                         /* A &= 0xf */
 787                         *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_A, 0xf);
 788                         /* A <<= 2 */
 789                         *insn++ = BPF_ALU32_IMM(BPF_LSH, BPF_REG_A, 2);
 790                         /* tmp = X */
 791                         *insn++ = BPF_MOV64_REG(BPF_REG_TMP, BPF_REG_X);
 792                         /* X = A */
 793                         *insn++ = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 794                         /* A = tmp */
 795                         *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_TMP);
 796                         break;
 797                 }
 798                 /* RET_K is remaped into 2 insns. RET_A case doesn't need an
 799                  * extra mov as BPF_REG_0 is already mapped into BPF_REG_A.
 800                  */
 801                 case BPF_RET | BPF_A:
 802                 case BPF_RET | BPF_K:
 803                         if (BPF_RVAL(fp->code) == BPF_K)
 804                                 *insn++ = BPF_MOV32_RAW(BPF_K, BPF_REG_0,
 805                                                         0, fp->k);
 806                         *insn = BPF_EXIT_INSN();
 807                         break;
 808
 809                 /* Store to stack. */
 810                 case BPF_ST:
 811                 case BPF_STX:
 812                         stack_off = fp->k * 4  + 4;
 813                         *insn = BPF_STX_MEM(BPF_W, BPF_REG_FP, BPF_CLASS(fp->code) ==
 814                                             BPF_ST ? BPF_REG_A : BPF_REG_X,
 815                                             -stack_off);
 816                         /* check_load_and_stores() verifies that classic BPF can
 817                          * load from stack only after write, so tracking
 818                          * stack_depth for ST|STX insns is enough
 819                          */
 820                         if (new_prog && new_prog->aux->stack_depth < stack_off)
 821                                 new_prog->aux->stack_depth = stack_off;
 822                         break;
 823
 824                 /* Load from stack. */
 825                 case BPF_LD | BPF_MEM:
 826                 case BPF_LDX | BPF_MEM:
 827                         stack_off = fp->k * 4  + 4;
 828                         *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD  ?
 829                                             BPF_REG_A : BPF_REG_X, BPF_REG_FP,
 830                                             -stack_off);
 831                         break;
 832
 833                 /* A = K or X = K */
 834                 case BPF_LD | BPF_IMM:
 835                 case BPF_LDX | BPF_IMM:
 836                         *insn = BPF_MOV32_IMM(BPF_CLASS(fp->code) == BPF_LD ?
 837                                               BPF_REG_A : BPF_REG_X, fp->k);
 838                         break;
 839
 840                 /* X = A */
 841                 case BPF_MISC | BPF_TAX:
 842                         *insn = BPF_MOV64_REG(BPF_REG_X, BPF_REG_A);
 843                         break;
 844
 845                 /* A = X */
 846                 case BPF_MISC | BPF_TXA:
 847                         *insn = BPF_MOV64_REG(BPF_REG_A, BPF_REG_X);
 848                         break;
 849
 850                 /* A = skb->len or X = skb->len */
 851                 case BPF_LD | BPF_W | BPF_LEN:
 852                 case BPF_LDX | BPF_W | BPF_LEN:
 853                         *insn = BPF_LDX_MEM(BPF_W, BPF_CLASS(fp->code) == BPF_LD ?
 854                                             BPF_REG_A : BPF_REG_X, BPF_REG_CTX,
 855                                             offsetof(struct sk_buff, len));
 856                         break;
 857
 858                 /* Access seccomp_data fields. */
 859                 case BPF_LDX | BPF_ABS | BPF_W:
 860                         /* A = *(u32 *) (ctx + K) */
 861                         *insn = BPF_LDX_MEM(BPF_W, BPF_REG_A, BPF_REG_CTX, fp->k);
 862                         break;
 863
 864                 /* Unknown instruction. */
 865                 default:
 866                         goto err;
 867                 }
 868
 869                 insn++;
 870                 if (new_prog)
 871                         memcpy(new_insn, tmp_insns,
 872                                sizeof(*insn) * (insn - tmp_insns));
 873                 new_insn += insn - tmp_insns;
 874         }
 875
 876         if (!new_prog) {
 877                 /* Only calculating new length. */
 878                 *new_len = new_insn - first_insn;
 879                 if (*seen_ld_abs)
 880                         *new_len += 4; /* Prologue bits. */
 881                 return 0;
 882         }
 883
 884         pass++;
 885         if (new_flen != new_insn - first_insn) {
 886                 new_flen = new_insn - first_insn;
 887                 if (pass > 2)
 888                         goto err;
 889                 goto do_pass;
 890         }
 891
 892         kfree(addrs);
 893         BUG_ON(*new_len != new_flen);
 894         return 0;
 895 err:
 896         kfree(addrs);
 897         return -EINVAL;
 898 }
 899
 900 /* Security:
 901  *
 902  * As we dont want to clear mem[] array for each packet going through
 903  * __bpf_prog_run(), we check that filter loaded by user never try to read
 904  * a cell if not previously written, and we check all branches to be sure
 905  * a malicious user doesn't try to abuse us.
 906  */
 907 static int check_load_and_stores(const struct sock_filter *filter, int flen)
 908 {
 909         u16 *masks, memvalid = 0; /* One bit per cell, 16 cells */
 910         int pc, ret = 0;
 911
 912         BUILD_BUG_ON(BPF_MEMWORDS > 16);
 913
 914         masks = kmalloc_array(flen, sizeof(*masks), GFP_KERNEL);
 915         if (!masks)
 916                 return -ENOMEM;
 917
 918         memset(masks, 0xff, flen * sizeof(*masks));
 919
 920         for (pc = 0; pc < flen; pc++) {
 921                 memvalid &= masks[pc];
 922
 923                 switch (filter[pc].code) {
 924                 case BPF_ST:
 925                 case BPF_STX:
 926                         memvalid |= (1 << filter[pc].k);
 927                         break;
 928                 case BPF_LD | BPF_MEM:
 929                 case BPF_LDX | BPF_MEM:
 930                         if (!(memvalid & (1 << filter[pc].k))) {
 931                                 ret = -EINVAL;
 932                                 goto error;
 933                         }
 934                         break;
 935                 case BPF_JMP | BPF_JA:
 936                         /* A jump must set masks on target */
 937                         masks[pc + 1 + filter[pc].k] &= memvalid;
 938                         memvalid = ~0;
 939                         break;
 940                 case BPF_JMP | BPF_JEQ | BPF_K:
 941                 case BPF_JMP | BPF_JEQ | BPF_X:
 942                 case BPF_JMP | BPF_JGE | BPF_K:
 943                 case BPF_JMP | BPF_JGE | BPF_X:
 944                 case BPF_JMP | BPF_JGT | BPF_K:
 945                 case BPF_JMP | BPF_JGT | BPF_X:
 946                 case BPF_JMP | BPF_JSET | BPF_K:
 947                 case BPF_JMP | BPF_JSET | BPF_X:
 948                         /* A jump must set masks on targets */
 949                         masks[pc + 1 + filter[pc].jt] &= memvalid;
 950                         masks[pc + 1 + filter[pc].jf] &= memvalid;
 951                         memvalid = ~0;
 952                         break;
 953                 }
 954         }
 955 error:
 956         kfree(masks);
 957         return ret;
 958 }
 959
 960 static bool chk_code_allowed(u16 code_to_probe)
 961 {
 962         static const bool codes[] = {
 963                 /* 32 bit ALU operations */
 964                 [BPF_ALU | BPF_ADD | BPF_K] = true,
 965                 [BPF_ALU | BPF_ADD | BPF_X] = true,
 966                 [BPF_ALU | BPF_SUB | BPF_K] = true,
 967                 [BPF_ALU | BPF_SUB | BPF_X] = true,
 968                 [BPF_ALU | BPF_MUL | BPF_K] = true,
 969                 [BPF_ALU | BPF_MUL | BPF_X] = true,
 970                 [BPF_ALU | BPF_DIV | BPF_K] = true,
 971                 [BPF_ALU | BPF_DIV | BPF_X] = true,
 972                 [BPF_ALU | BPF_MOD | BPF_K] = true,
 973                 [BPF_ALU | BPF_MOD | BPF_X] = true,
 974                 [BPF_ALU | BPF_AND | BPF_K] = true,
 975                 [BPF_ALU | BPF_AND | BPF_X] = true,
 976                 [BPF_ALU | BPF_OR | BPF_K] = true,
 977                 [BPF_ALU | BPF_OR | BPF_X] = true,
 978                 [BPF_ALU | BPF_XOR | BPF_K] = true,
 979                 [BPF_ALU | BPF_XOR | BPF_X] = true,
 980                 [BPF_ALU | BPF_LSH | BPF_K] = true,
 981                 [BPF_ALU | BPF_LSH | BPF_X] = true,
 982                 [BPF_ALU | BPF_RSH | BPF_K] = true,
 983                 [BPF_ALU | BPF_RSH | BPF_X] = true,
 984                 [BPF_ALU | BPF_NEG] = true,
 985                 /* Load instructions */
 986                 [BPF_LD | BPF_W | BPF_ABS] = true,
 987                 [BPF_LD | BPF_H | BPF_ABS] = true,
 988                 [BPF_LD | BPF_B | BPF_ABS] = true,
 989                 [BPF_LD | BPF_W | BPF_LEN] = true,
 990                 [BPF_LD | BPF_W | BPF_IND] = true,
 991                 [BPF_LD | BPF_H | BPF_IND] = true,
 992                 [BPF_LD | BPF_B | BPF_IND] = true,
 993                 [BPF_LD | BPF_IMM] = true,
 994                 [BPF_LD | BPF_MEM] = true,
 995                 [BPF_LDX | BPF_W | BPF_LEN] = true,
 996                 [BPF_LDX | BPF_B | BPF_MSH] = true,
 997                 [BPF_LDX | BPF_IMM] = true,
 998                 [BPF_LDX | BPF_MEM] = true,
 999                 /* Store instructions */
1000                 [BPF_ST] = true,
1001                 [BPF_STX] = true,
1002                 /* Misc instructions */
1003                 [BPF_MISC | BPF_TAX] = true,
1004                 [BPF_MISC | BPF_TXA] = true,
1005                 /* Return instructions */
1006                 [BPF_RET | BPF_K] = true,
1007                 [BPF_RET | BPF_A] = true,
1008                 /* Jump instructions */
1009                 [BPF_JMP | BPF_JA] = true,
1010                 [BPF_JMP | BPF_JEQ | BPF_K] = true,
1011                 [BPF_JMP | BPF_JEQ | BPF_X] = true,
1012                 [BPF_JMP | BPF_JGE | BPF_K] = true,
1013                 [BPF_JMP | BPF_JGE | BPF_X] = true,
1014                 [BPF_JMP | BPF_JGT | BPF_K] = true,
1015                 [BPF_JMP | BPF_JGT | BPF_X] = true,
1016                 [BPF_JMP | BPF_JSET | BPF_K] = true,
1017                 [BPF_JMP | BPF_JSET | BPF_X] = true,
1018         };
1019
1020         if (code_to_probe >= ARRAY_SIZE(codes))
1021                 return false;
1022
1023         return codes[code_to_probe];
1024 }
1025
1026 static bool bpf_check_basics_ok(const struct sock_filter *filter,
1027                                 unsigned int flen)
1028 {
1029         if (filter == NULL)
1030                 return false;
1031         if (flen == 0 || flen > BPF_MAXINSNS)
1032                 return false;
1033
1034         return true;
1035 }
1036
1037 /**
1038  *      bpf_check_classic - verify socket filter code
1039  *      @filter: filter to verify
1040  *      @flen: length of filter
1041  *
1042  * Check the user's filter code. If we let some ugly
1043  * filter code slip through kaboom! The filter must contain
1044  * no references or jumps that are out of range, no illegal
1045  * instructions, and must end with a RET instruction.
1046  *
1047  * All jumps are forward as they are not signed.
1048  *
1049  * Returns 0 if the rule set is legal or -EINVAL if not.
1050  */
1051 static int bpf_check_classic(const struct sock_filter *filter,
1052                              unsigned int flen)
1053 {
1054         bool anc_found;
1055         int pc;
1056
1057         /* Check the filter code now */
1058         for (pc = 0; pc < flen; pc++) {
1059                 const struct sock_filter *ftest = &filter[pc];
1060
1061                 /* May we actually operate on this code? */
1062                 if (!chk_code_allowed(ftest->code))
1063                         return -EINVAL;
1064
1065                 /* Some instructions need special checks */
1066                 switch (ftest->code) {
1067                 case BPF_ALU | BPF_DIV | BPF_K:
1068                 case BPF_ALU | BPF_MOD | BPF_K:
1069                         /* Check for division by zero */
1070                         if (ftest->k == 0)
1071                                 return -EINVAL;
1072                         break;
1073                 case BPF_ALU | BPF_LSH | BPF_K:
1074                 case BPF_ALU | BPF_RSH | BPF_K:
1075                         if (ftest->k >= 32)
1076                                 return -EINVAL;
1077                         break;
1078                 case BPF_LD | BPF_MEM:
1079                 case BPF_LDX | BPF_MEM:
1080                 case BPF_ST:
1081                 case BPF_STX:
1082                         /* Check for invalid memory addresses */
1083                         if (ftest->k >= BPF_MEMWORDS)
1084                                 return -EINVAL;
1085                         break;
1086                 case BPF_JMP | BPF_JA:
1087                         /* Note, the large ftest->k might cause loops.
1088                          * Compare this with conditional jumps below,
1089                          * where offsets are limited. --ANK (981016)
1090                          */
1091                         if (ftest->k >= (unsigned int)(flen - pc - 1))
1092                                 return -EINVAL;
1093                         break;
1094                 case BPF_JMP | BPF_JEQ | BPF_K:
1095                 case BPF_JMP | BPF_JEQ | BPF_X:
1096                 case BPF_JMP | BPF_JGE | BPF_K:
1097                 case BPF_JMP | BPF_JGE | BPF_X:
1098                 case BPF_JMP | BPF_JGT | BPF_K:
1099                 case BPF_JMP | BPF_JGT | BPF_X:
1100                 case BPF_JMP | BPF_JSET | BPF_K:
1101                 case BPF_JMP | BPF_JSET | BPF_X:
1102                         /* Both conditionals must be safe */
1103                         if (pc + ftest->jt + 1 >= flen ||
1104                             pc + ftest->jf + 1 >= flen)
1105                                 return -EINVAL;
1106                         break;
1107                 case BPF_LD | BPF_W | BPF_ABS:
1108                 case BPF_LD | BPF_H | BPF_ABS:
1109                 case BPF_LD | BPF_B | BPF_ABS:
1110                         anc_found = false;
1111                         if (bpf_anc_helper(ftest) & BPF_ANC)
1112                                 anc_found = true;
1113                         /* Ancillary operation unknown or unsupported */
1114                         if (anc_found == false && ftest->k >= SKF_AD_OFF)
1115                                 return -EINVAL;
1116                 }
1117         }
1118
1119         /* Last instruction must be a RET code */
1120         switch (filter[flen - 1].code) {
1121         case BPF_RET | BPF_K:
1122         case BPF_RET | BPF_A:
1123                 return check_load_and_stores(filter, flen);
1124         }
1125
1126         return -EINVAL;
1127 }
1128
1129 static int bpf_prog_store_orig_filter(struct bpf_prog *fp,
1130                                       const struct sock_fprog *fprog)
1131 {
1132         unsigned int fsize = bpf_classic_proglen(fprog);
1133         struct sock_fprog_kern *fkprog;
1134
1135         fp->orig_prog = kmalloc(sizeof(*fkprog), GFP_KERNEL);
1136         if (!fp->orig_prog)
1137                 return -ENOMEM;
1138
1139         fkprog = fp->orig_prog;
1140         fkprog->len = fprog->len;
1141
1142         fkprog->filter = kmemdup(fp->insns, fsize,
1143                                  GFP_KERNEL | __GFP_NOWARN);
1144         if (!fkprog->filter) {
1145                 kfree(fp->orig_prog);
1146                 return -ENOMEM;
1147         }
1148
1149         return 0;
1150 }
1151
1152 static void bpf_release_orig_filter(struct bpf_prog *fp)
1153 {
1154         struct sock_fprog_kern *fprog = fp->orig_prog;
1155
1156         if (fprog) {
1157                 kfree(fprog->filter);
1158                 kfree(fprog);
1159         }
1160 }
1161
1162 static void __bpf_prog_release(struct bpf_prog *prog)
1163 {
1164         if (prog->type == BPF_PROG_TYPE_SOCKET_FILTER) {
1165                 bpf_prog_put(prog);
1166         } else {
1167                 bpf_release_orig_filter(prog);
1168                 bpf_prog_free(prog);
1169         }
1170 }
1171
1172 static void __sk_filter_release(struct sk_filter *fp)
1173 {
1174         __bpf_prog_release(fp->prog);
1175         kfree(fp);
1176 }
1177
1178 /**
1179  *      sk_filter_release_rcu - Release a socket filter by rcu_head
1180  *      @rcu: rcu_head that contains the sk_filter to free
1181  */
1182 static void sk_filter_release_rcu(struct rcu_head *rcu)
1183 {
1184         struct sk_filter *fp = container_of(rcu, struct sk_filter, rcu);
1185
1186         __sk_filter_release(fp);
1187 }
1188
1189 /**
1190  *      sk_filter_release - release a socket filter
1191  *      @fp: filter to remove
1192  *
1193  *      Remove a filter from a socket and release its resources.
1194  */
1195 static void sk_filter_release(struct sk_filter *fp)
1196 {
1197         if (refcount_dec_and_test(&fp->refcnt))
1198                 call_rcu(&fp->rcu, sk_filter_release_rcu);
1199 }
1200
1201 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp)
1202 {
1203         u32 filter_size = bpf_prog_size(fp->prog->len);
1204
1205         atomic_sub(filter_size, &sk->sk_omem_alloc);
1206         sk_filter_release(fp);
1207 }
1208
1209 /* try to charge the socket memory if there is space available
1210  * return true on success
1211  */
1212 static bool __sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1213 {
1214         u32 filter_size = bpf_prog_size(fp->prog->len);
1215
1216         /* same check as in sock_kmalloc() */
1217         if (filter_size <= sysctl_optmem_max &&
1218             atomic_read(&sk->sk_omem_alloc) + filter_size < sysctl_optmem_max) {
1219                 atomic_add(filter_size, &sk->sk_omem_alloc);
1220                 return true;
1221         }
1222         return false;
1223 }
1224
1225 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp)
1226 {
1227         if (!refcount_inc_not_zero(&fp->refcnt))
1228                 return false;
1229
1230         if (!__sk_filter_charge(sk, fp)) {
1231                 sk_filter_release(fp);
1232                 return false;
1233         }
1234         return true;
1235 }
1236
1237 static struct bpf_prog *bpf_migrate_filter(struct bpf_prog *fp)
1238 {
1239         struct sock_filter *old_prog;
1240         struct bpf_prog *old_fp;
1241         int err, new_len, old_len = fp->len;
1242         bool seen_ld_abs = false;
1243
1244         /* We are free to overwrite insns et al right here as it
1245          * won't be used at this point in time anymore internally
1246          * after the migration to the internal BPF instruction
1247          * representation.
1248          */
1249         BUILD_BUG_ON(sizeof(struct sock_filter) !=
1250                      sizeof(struct bpf_insn));
1251
1252         /* Conversion cannot happen on overlapping memory areas,
1253          * so we need to keep the user BPF around until the 2nd
1254          * pass. At this time, the user BPF is stored in fp->insns.
1255          */
1256         old_prog = kmemdup(fp->insns, old_len * sizeof(struct sock_filter),
1257                            GFP_KERNEL | __GFP_NOWARN);
1258         if (!old_prog) {
1259                 err = -ENOMEM;
1260                 goto out_err;
1261         }
1262
1263         /* 1st pass: calculate the new program length. */
1264         err = bpf_convert_filter(old_prog, old_len, NULL, &new_len,
1265                                  &seen_ld_abs);
1266         if (err)
1267                 goto out_err_free;
1268
1269         /* Expand fp for appending the new filter representation. */
1270         old_fp = fp;
1271         fp = bpf_prog_realloc(old_fp, bpf_prog_size(new_len), 0);
1272         if (!fp) {
1273                 /* The old_fp is still around in case we couldn't
1274                  * allocate new memory, so uncharge on that one.
1275                  */
1276                 fp = old_fp;
1277                 err = -ENOMEM;
1278                 goto out_err_free;
1279         }
1280
1281         fp->len = new_len;
1282
1283         /* 2nd pass: remap sock_filter insns into bpf_insn insns. */
1284         err = bpf_convert_filter(old_prog, old_len, fp, &new_len,
1285                                  &seen_ld_abs);
1286         if (err)
1287                 /* 2nd bpf_convert_filter() can fail only if it fails
1288                  * to allocate memory, remapping must succeed. Note,
1289                  * that at this time old_fp has already been released
1290                  * by krealloc().
1291                  */
1292                 goto out_err_free;
1293
1294         fp = bpf_prog_select_runtime(fp, &err);
1295         if (err)
1296                 goto out_err_free;
1297
1298         kfree(old_prog);
1299         return fp;
1300
1301 out_err_free:
1302         kfree(old_prog);
1303 out_err:
1304         __bpf_prog_release(fp);
1305         return ERR_PTR(err);
1306 }
1307
1308 static struct bpf_prog *bpf_prepare_filter(struct bpf_prog *fp,
1309                                            bpf_aux_classic_check_t trans)
1310 {
1311         int err;
1312
1313         fp->bpf_func = NULL;
1314         fp->jited = 0;
1315
1316         err = bpf_check_classic(fp->insns, fp->len);
1317         if (err) {
1318                 __bpf_prog_release(fp);
1319                 return ERR_PTR(err);
1320         }
1321
1322         /* There might be additional checks and transformations
1323          * needed on classic filters, f.e. in case of seccomp.
1324          */
1325         if (trans) {
1326                 err = trans(fp->insns, fp->len);
1327                 if (err) {
1328                         __bpf_prog_release(fp);
1329                         return ERR_PTR(err);
1330                 }
1331         }
1332
1333         /* Probe if we can JIT compile the filter and if so, do
1334          * the compilation of the filter.
1335          */
1336         bpf_jit_compile(fp);
1337
1338         /* JIT compiler couldn't process this filter, so do the
1339          * internal BPF translation for the optimized interpreter.
1340          */
1341         if (!fp->jited)
1342                 fp = bpf_migrate_filter(fp);
1343
1344         return fp;
1345 }
1346
1347 /**
1348  *      bpf_prog_create - create an unattached filter
1349  *      @pfp: the unattached filter that is created
1350  *      @fprog: the filter program
1351  *
1352  * Create a filter independent of any socket. We first run some
1353  * sanity checks on it to make sure it does not explode on us later.
1354  * If an error occurs or there is insufficient memory for the filter
1355  * a negative errno code is returned. On success the return is zero.
1356  */
1357 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog)
1358 {
1359         unsigned int fsize = bpf_classic_proglen(fprog);
1360         struct bpf_prog *fp;
1361
1362         /* Make sure new filter is there and in the right amounts. */
1363         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1364                 return -EINVAL;
1365
1366         fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1367         if (!fp)
1368                 return -ENOMEM;
1369
1370         memcpy(fp->insns, fprog->filter, fsize);
1371
1372         fp->len = fprog->len;
1373         /* Since unattached filters are not copied back to user
1374          * space through sk_get_filter(), we do not need to hold
1375          * a copy here, and can spare us the work.
1376          */
1377         fp->orig_prog = NULL;
1378
1379         /* bpf_prepare_filter() already takes care of freeing
1380          * memory in case something goes wrong.
1381          */
1382         fp = bpf_prepare_filter(fp, NULL);
1383         if (IS_ERR(fp))
1384                 return PTR_ERR(fp);
1385
1386         *pfp = fp;
1387         return 0;
1388 }
1389 EXPORT_SYMBOL_GPL(bpf_prog_create);
1390
1391 /**
1392  *      bpf_prog_create_from_user - create an unattached filter from user buffer
1393  *      @pfp: the unattached filter that is created
1394  *      @fprog: the filter program
1395  *      @trans: post-classic verifier transformation handler
1396  *      @save_orig: save classic BPF program
1397  *
1398  * This function effectively does the same as bpf_prog_create(), only
1399  * that it builds up its insns buffer from user space provided buffer.
1400  * It also allows for passing a bpf_aux_classic_check_t handler.
1401  */
1402 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1403                               bpf_aux_classic_check_t trans, bool save_orig)
1404 {
1405         unsigned int fsize = bpf_classic_proglen(fprog);
1406         struct bpf_prog *fp;
1407         int err;
1408
1409         /* Make sure new filter is there and in the right amounts. */
1410         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1411                 return -EINVAL;
1412
1413         fp = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1414         if (!fp)
1415                 return -ENOMEM;
1416
1417         if (copy_from_user(fp->insns, fprog->filter, fsize)) {
1418                 __bpf_prog_free(fp);
1419                 return -EFAULT;
1420         }
1421
1422         fp->len = fprog->len;
1423         fp->orig_prog = NULL;
1424
1425         if (save_orig) {
1426                 err = bpf_prog_store_orig_filter(fp, fprog);
1427                 if (err) {
1428                         __bpf_prog_free(fp);
1429                         return -ENOMEM;
1430                 }
1431         }
1432
1433         /* bpf_prepare_filter() already takes care of freeing
1434          * memory in case something goes wrong.
1435          */
1436         fp = bpf_prepare_filter(fp, trans);
1437         if (IS_ERR(fp))
1438                 return PTR_ERR(fp);
1439
1440         *pfp = fp;
1441         return 0;
1442 }
1443 EXPORT_SYMBOL_GPL(bpf_prog_create_from_user);
1444
1445 void bpf_prog_destroy(struct bpf_prog *fp)
1446 {
1447         __bpf_prog_release(fp);
1448 }
1449 EXPORT_SYMBOL_GPL(bpf_prog_destroy);
1450
1451 static int __sk_attach_prog(struct bpf_prog *prog, struct sock *sk)
1452 {
1453         struct sk_filter *fp, *old_fp;
1454
1455         fp = kmalloc(sizeof(*fp), GFP_KERNEL);
1456         if (!fp)
1457                 return -ENOMEM;
1458
1459         fp->prog = prog;
1460
1461         if (!__sk_filter_charge(sk, fp)) {
1462                 kfree(fp);
1463                 return -ENOMEM;
1464         }
1465         refcount_set(&fp->refcnt, 1);
1466
1467         old_fp = rcu_dereference_protected(sk->sk_filter,
1468                                            lockdep_sock_is_held(sk));
1469         rcu_assign_pointer(sk->sk_filter, fp);
1470
1471         if (old_fp)
1472                 sk_filter_uncharge(sk, old_fp);
1473
1474         return 0;
1475 }
1476
1477 static
1478 struct bpf_prog *__get_filter(struct sock_fprog *fprog, struct sock *sk)
1479 {
1480         unsigned int fsize = bpf_classic_proglen(fprog);
1481         struct bpf_prog *prog;
1482         int err;
1483
1484         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1485                 return ERR_PTR(-EPERM);
1486
1487         /* Make sure new filter is there and in the right amounts. */
1488         if (!bpf_check_basics_ok(fprog->filter, fprog->len))
1489                 return ERR_PTR(-EINVAL);
1490
1491         prog = bpf_prog_alloc(bpf_prog_size(fprog->len), 0);
1492         if (!prog)
1493                 return ERR_PTR(-ENOMEM);
1494
1495         if (copy_from_user(prog->insns, fprog->filter, fsize)) {
1496                 __bpf_prog_free(prog);
1497                 return ERR_PTR(-EFAULT);
1498         }
1499
1500         prog->len = fprog->len;
1501
1502         err = bpf_prog_store_orig_filter(prog, fprog);
1503         if (err) {
1504                 __bpf_prog_free(prog);
1505                 return ERR_PTR(-ENOMEM);
1506         }
1507
1508         /* bpf_prepare_filter() already takes care of freeing
1509          * memory in case something goes wrong.
1510          */
1511         return bpf_prepare_filter(prog, NULL);
1512 }
1513
1514 /**
1515  *      sk_attach_filter - attach a socket filter
1516  *      @fprog: the filter program
1517  *      @sk: the socket to use
1518  *
1519  * Attach the user's filter code. We first run some sanity checks on
1520  * it to make sure it does not explode on us later. If an error
1521  * occurs or there is insufficient memory for the filter a negative
1522  * errno code is returned. On success the return is zero.
1523  */
1524 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1525 {
1526         struct bpf_prog *prog = __get_filter(fprog, sk);
1527         int err;
1528
1529         if (IS_ERR(prog))
1530                 return PTR_ERR(prog);
1531
1532         err = __sk_attach_prog(prog, sk);
1533         if (err < 0) {
1534                 __bpf_prog_release(prog);
1535                 return err;
1536         }
1537
1538         return 0;
1539 }
1540 EXPORT_SYMBOL_GPL(sk_attach_filter);
1541
1542 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk)
1543 {
1544         struct bpf_prog *prog = __get_filter(fprog, sk);
1545         int err;
1546
1547         if (IS_ERR(prog))
1548                 return PTR_ERR(prog);
1549
1550         if (bpf_prog_size(prog->len) > sysctl_optmem_max)
1551                 err = -ENOMEM;
1552         else
1553                 err = reuseport_attach_prog(sk, prog);
1554
1555         if (err)
1556                 __bpf_prog_release(prog);
1557
1558         return err;
1559 }
1560
1561 static struct bpf_prog *__get_bpf(u32 ufd, struct sock *sk)
1562 {
1563         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1564                 return ERR_PTR(-EPERM);
1565
1566         return bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1567 }
1568
1569 int sk_attach_bpf(u32 ufd, struct sock *sk)
1570 {
1571         struct bpf_prog *prog = __get_bpf(ufd, sk);
1572         int err;
1573
1574         if (IS_ERR(prog))
1575                 return PTR_ERR(prog);
1576
1577         err = __sk_attach_prog(prog, sk);
1578         if (err < 0) {
1579                 bpf_prog_put(prog);
1580                 return err;
1581         }
1582
1583         return 0;
1584 }
1585
1586 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk)
1587 {
1588         struct bpf_prog *prog;
1589         int err;
1590
1591         if (sock_flag(sk, SOCK_FILTER_LOCKED))
1592                 return -EPERM;
1593
1594         prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SOCKET_FILTER);
1595         if (PTR_ERR(prog) == -EINVAL)
1596                 prog = bpf_prog_get_type(ufd, BPF_PROG_TYPE_SK_REUSEPORT);
1597         if (IS_ERR(prog))
1598                 return PTR_ERR(prog);
1599
1600         if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT) {
1601                 /* Like other non BPF_PROG_TYPE_SOCKET_FILTER
1602                  * bpf prog (e.g. sockmap).  It depends on the
1603                  * limitation imposed by bpf_prog_load().
1604                  * Hence, sysctl_optmem_max is not checked.
1605                  */
1606                 if ((sk->sk_type != SOCK_STREAM &&
1607                      sk->sk_type != SOCK_DGRAM) ||
1608                     (sk->sk_protocol != IPPROTO_UDP &&
1609                      sk->sk_protocol != IPPROTO_TCP) ||
1610                     (sk->sk_family != AF_INET &&
1611                      sk->sk_family != AF_INET6)) {
1612                         err = -ENOTSUPP;
1613                         goto err_prog_put;
1614                 }
1615         } else {
1616                 /* BPF_PROG_TYPE_SOCKET_FILTER */
1617                 if (bpf_prog_size(prog->len) > sysctl_optmem_max) {
1618                         err = -ENOMEM;
1619                         goto err_prog_put;
1620                 }
1621         }
1622
1623         err = reuseport_attach_prog(sk, prog);
1624 err_prog_put:
1625         if (err)
1626                 bpf_prog_put(prog);
1627
1628         return err;
1629 }
1630
1631 void sk_reuseport_prog_free(struct bpf_prog *prog)
1632 {
1633         if (!prog)
1634                 return;
1635
1636         if (prog->type == BPF_PROG_TYPE_SK_REUSEPORT)
1637                 bpf_prog_put(prog);
1638         else
1639                 bpf_prog_destroy(prog);
1640 }
1641
1642 struct bpf_scratchpad {
1643         union {
1644                 __be32 diff[MAX_BPF_STACK / sizeof(__be32)];
1645                 u8     buff[MAX_BPF_STACK];
1646         };
1647 };
1648
1649 static DEFINE_PER_CPU(struct bpf_scratchpad, bpf_sp);
1650
1651 static inline int __bpf_try_make_writable(struct sk_buff *skb,
1652                                           unsigned int write_len)
1653 {
1654         return skb_ensure_writable(skb, write_len);
1655 }
1656
1657 static inline int bpf_try_make_writable(struct sk_buff *skb,
1658                                         unsigned int write_len)
1659 {
1660         int err = __bpf_try_make_writable(skb, write_len);
1661
1662         bpf_compute_data_pointers(skb);
1663         return err;
1664 }
1665
1666 static int bpf_try_make_head_writable(struct sk_buff *skb)
1667 {
1668         return bpf_try_make_writable(skb, skb_headlen(skb));
1669 }
1670
1671 static inline void bpf_push_mac_rcsum(struct sk_buff *skb)
1672 {
1673         if (skb_at_tc_ingress(skb))
1674                 skb_postpush_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1675 }
1676
1677 static inline void bpf_pull_mac_rcsum(struct sk_buff *skb)
1678 {
1679         if (skb_at_tc_ingress(skb))
1680                 skb_postpull_rcsum(skb, skb_mac_header(skb), skb->mac_len);
1681 }
1682
1683 BPF_CALL_5(bpf_skb_store_bytes, struct sk_buff *, skb, u32, offset,
1684            const void *, from, u32, len, u64, flags)
1685 {
1686         void *ptr;
1687
1688         if (unlikely(flags & ~(BPF_F_RECOMPUTE_CSUM | BPF_F_INVALIDATE_HASH)))
1689                 return -EINVAL;
1690         if (unlikely(offset > 0xffff))
1691                 return -EFAULT;
1692         if (unlikely(bpf_try_make_writable(skb, offset + len)))
1693                 return -EFAULT;
1694
1695         ptr = skb->data + offset;
1696         if (flags & BPF_F_RECOMPUTE_CSUM)
1697                 __skb_postpull_rcsum(skb, ptr, len, offset);
1698
1699         memcpy(ptr, from, len);
1700
1701         if (flags & BPF_F_RECOMPUTE_CSUM)
1702                 __skb_postpush_rcsum(skb, ptr, len, offset);
1703         if (flags & BPF_F_INVALIDATE_HASH)
1704                 skb_clear_hash(skb);
1705
1706         return 0;
1707 }
1708
1709 static const struct bpf_func_proto bpf_skb_store_bytes_proto = {
1710         .func           = bpf_skb_store_bytes,
1711         .gpl_only       = false,
1712         .ret_type       = RET_INTEGER,
1713         .arg1_type      = ARG_PTR_TO_CTX,
1714         .arg2_type      = ARG_ANYTHING,
1715         .arg3_type      = ARG_PTR_TO_MEM,
1716         .arg4_type      = ARG_CONST_SIZE,
1717         .arg5_type      = ARG_ANYTHING,
1718 };
1719
1720 BPF_CALL_4(bpf_skb_load_bytes, const struct sk_buff *, skb, u32, offset,
1721            void *, to, u32, len)
1722 {
1723         void *ptr;
1724
1725         if (unlikely(offset > 0xffff))
1726                 goto err_clear;
1727
1728         ptr = skb_header_pointer(skb, offset, len, to);
1729         if (unlikely(!ptr))
1730                 goto err_clear;
1731         if (ptr != to)
1732                 memcpy(to, ptr, len);
1733
1734         return 0;
1735 err_clear:
1736         memset(to, 0, len);
1737         return -EFAULT;
1738 }
1739
1740 static const struct bpf_func_proto bpf_skb_load_bytes_proto = {
1741         .func           = bpf_skb_load_bytes,
1742         .gpl_only       = false,
1743         .ret_type       = RET_INTEGER,
1744         .arg1_type      = ARG_PTR_TO_CTX,
1745         .arg2_type      = ARG_ANYTHING,
1746         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1747         .arg4_type      = ARG_CONST_SIZE,
1748 };
1749
1750 BPF_CALL_4(bpf_flow_dissector_load_bytes,
1751            const struct bpf_flow_dissector *, ctx, u32, offset,
1752            void *, to, u32, len)
1753 {
1754         void *ptr;
1755
1756         if (unlikely(offset > 0xffff))
1757                 goto err_clear;
1758
1759         if (unlikely(!ctx->skb))
1760                 goto err_clear;
1761
1762         ptr = skb_header_pointer(ctx->skb, offset, len, to);
1763         if (unlikely(!ptr))
1764                 goto err_clear;
1765         if (ptr != to)
1766                 memcpy(to, ptr, len);
1767
1768         return 0;
1769 err_clear:
1770         memset(to, 0, len);
1771         return -EFAULT;
1772 }
1773
1774 static const struct bpf_func_proto bpf_flow_dissector_load_bytes_proto = {
1775         .func           = bpf_flow_dissector_load_bytes,
1776         .gpl_only       = false,
1777         .ret_type       = RET_INTEGER,
1778         .arg1_type      = ARG_PTR_TO_CTX,
1779         .arg2_type      = ARG_ANYTHING,
1780         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1781         .arg4_type      = ARG_CONST_SIZE,
1782 };
1783
1784 BPF_CALL_5(bpf_skb_load_bytes_relative, const struct sk_buff *, skb,
1785            u32, offset, void *, to, u32, len, u32, start_header)
1786 {
1787         u8 *end = skb_tail_pointer(skb);
1788         u8 *start, *ptr;
1789
1790         if (unlikely(offset > 0xffff))
1791                 goto err_clear;
1792
1793         switch (start_header) {
1794         case BPF_HDR_START_MAC:
1795                 if (unlikely(!skb_mac_header_was_set(skb)))
1796                         goto err_clear;
1797                 start = skb_mac_header(skb);
1798                 break;
1799         case BPF_HDR_START_NET:
1800                 start = skb_network_header(skb);
1801                 break;
1802         default:
1803                 goto err_clear;
1804         }
1805
1806         ptr = start + offset;
1807
1808         if (likely(ptr + len <= end)) {
1809                 memcpy(to, ptr, len);
1810                 return 0;
1811         }
1812
1813 err_clear:
1814         memset(to, 0, len);
1815         return -EFAULT;
1816 }
1817
1818 static const struct bpf_func_proto bpf_skb_load_bytes_relative_proto = {
1819         .func           = bpf_skb_load_bytes_relative,
1820         .gpl_only       = false,
1821         .ret_type       = RET_INTEGER,
1822         .arg1_type      = ARG_PTR_TO_CTX,
1823         .arg2_type      = ARG_ANYTHING,
1824         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
1825         .arg4_type      = ARG_CONST_SIZE,
1826         .arg5_type      = ARG_ANYTHING,
1827 };
1828
1829 BPF_CALL_2(bpf_skb_pull_data, struct sk_buff *, skb, u32, len)
1830 {
1831         /* Idea is the following: should the needed direct read/write
1832          * test fail during runtime, we can pull in more data and redo
1833          * again, since implicitly, we invalidate previous checks here.
1834          *
1835          * Or, since we know how much we need to make read/writeable,
1836          * this can be done once at the program beginning for direct
1837          * access case. By this we overcome limitations of only current
1838          * headroom being accessible.
1839          */
1840         return bpf_try_make_writable(skb, len ? : skb_headlen(skb));
1841 }
1842
1843 static const struct bpf_func_proto bpf_skb_pull_data_proto = {
1844         .func           = bpf_skb_pull_data,
1845         .gpl_only       = false,
1846         .ret_type       = RET_INTEGER,
1847         .arg1_type      = ARG_PTR_TO_CTX,
1848         .arg2_type      = ARG_ANYTHING,
1849 };
1850
1851 BPF_CALL_1(bpf_sk_fullsock, struct sock *, sk)
1852 {
1853         return sk_fullsock(sk) ? (unsigned long)sk : (unsigned long)NULL;
1854 }
1855
1856 static const struct bpf_func_proto bpf_sk_fullsock_proto = {
1857         .func           = bpf_sk_fullsock,
1858         .gpl_only       = false,
1859         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
1860         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
1861 };
1862
1863 static inline int sk_skb_try_make_writable(struct sk_buff *skb,
1864                                            unsigned int write_len)
1865 {
1866         int err = __bpf_try_make_writable(skb, write_len);
1867
1868         bpf_compute_data_end_sk_skb(skb);
1869         return err;
1870 }
1871
1872 BPF_CALL_2(sk_skb_pull_data, struct sk_buff *, skb, u32, len)
1873 {
1874         /* Idea is the following: should the needed direct read/write
1875          * test fail during runtime, we can pull in more data and redo
1876          * again, since implicitly, we invalidate previous checks here.
1877          *
1878          * Or, since we know how much we need to make read/writeable,
1879          * this can be done once at the program beginning for direct
1880          * access case. By this we overcome limitations of only current
1881          * headroom being accessible.
1882          */
1883         return sk_skb_try_make_writable(skb, len ? : skb_headlen(skb));
1884 }
1885
1886 static const struct bpf_func_proto sk_skb_pull_data_proto = {
1887         .func           = sk_skb_pull_data,
1888         .gpl_only       = false,
1889         .ret_type       = RET_INTEGER,
1890         .arg1_type      = ARG_PTR_TO_CTX,
1891         .arg2_type      = ARG_ANYTHING,
1892 };
1893
1894 BPF_CALL_5(bpf_l3_csum_replace, struct sk_buff *, skb, u32, offset,
1895            u64, from, u64, to, u64, flags)
1896 {
1897         __sum16 *ptr;
1898
1899         if (unlikely(flags & ~(BPF_F_HDR_FIELD_MASK)))
1900                 return -EINVAL;
1901         if (unlikely(offset > 0xffff || offset & 1))
1902                 return -EFAULT;
1903         if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1904                 return -EFAULT;
1905
1906         ptr = (__sum16 *)(skb->data + offset);
1907         switch (flags & BPF_F_HDR_FIELD_MASK) {
1908         case 0:
1909                 if (unlikely(from != 0))
1910                         return -EINVAL;
1911
1912                 csum_replace_by_diff(ptr, to);
1913                 break;
1914         case 2:
1915                 csum_replace2(ptr, from, to);
1916                 break;
1917         case 4:
1918                 csum_replace4(ptr, from, to);
1919                 break;
1920         default:
1921                 return -EINVAL;
1922         }
1923
1924         return 0;
1925 }
1926
1927 static const struct bpf_func_proto bpf_l3_csum_replace_proto = {
1928         .func           = bpf_l3_csum_replace,
1929         .gpl_only       = false,
1930         .ret_type       = RET_INTEGER,
1931         .arg1_type      = ARG_PTR_TO_CTX,
1932         .arg2_type      = ARG_ANYTHING,
1933         .arg3_type      = ARG_ANYTHING,
1934         .arg4_type      = ARG_ANYTHING,
1935         .arg5_type      = ARG_ANYTHING,
1936 };
1937
1938 BPF_CALL_5(bpf_l4_csum_replace, struct sk_buff *, skb, u32, offset,
1939            u64, from, u64, to, u64, flags)
1940 {
1941         bool is_pseudo = flags & BPF_F_PSEUDO_HDR;
1942         bool is_mmzero = flags & BPF_F_MARK_MANGLED_0;
1943         bool do_mforce = flags & BPF_F_MARK_ENFORCE;
1944         __sum16 *ptr;
1945
1946         if (unlikely(flags & ~(BPF_F_MARK_MANGLED_0 | BPF_F_MARK_ENFORCE |
1947                                BPF_F_PSEUDO_HDR | BPF_F_HDR_FIELD_MASK)))
1948                 return -EINVAL;
1949         if (unlikely(offset > 0xffff || offset & 1))
1950                 return -EFAULT;
1951         if (unlikely(bpf_try_make_writable(skb, offset + sizeof(*ptr))))
1952                 return -EFAULT;
1953
1954         ptr = (__sum16 *)(skb->data + offset);
1955         if (is_mmzero && !do_mforce && !*ptr)
1956                 return 0;
1957
1958         switch (flags & BPF_F_HDR_FIELD_MASK) {
1959         case 0:
1960                 if (unlikely(from != 0))
1961                         return -EINVAL;
1962
1963                 inet_proto_csum_replace_by_diff(ptr, skb, to, is_pseudo);
1964                 break;
1965         case 2:
1966                 inet_proto_csum_replace2(ptr, skb, from, to, is_pseudo);
1967                 break;
1968         case 4:
1969                 inet_proto_csum_replace4(ptr, skb, from, to, is_pseudo);
1970                 break;
1971         default:
1972                 return -EINVAL;
1973         }
1974
1975         if (is_mmzero && !*ptr)
1976                 *ptr = CSUM_MANGLED_0;
1977         return 0;
1978 }
1979
1980 static const struct bpf_func_proto bpf_l4_csum_replace_proto = {
1981         .func           = bpf_l4_csum_replace,
1982         .gpl_only       = false,
1983         .ret_type       = RET_INTEGER,
1984         .arg1_type      = ARG_PTR_TO_CTX,
1985         .arg2_type      = ARG_ANYTHING,
1986         .arg3_type      = ARG_ANYTHING,
1987         .arg4_type      = ARG_ANYTHING,
1988         .arg5_type      = ARG_ANYTHING,
1989 };
1990
1991 BPF_CALL_5(bpf_csum_diff, __be32 *, from, u32, from_size,
1992            __be32 *, to, u32, to_size, __wsum, seed)
1993 {
1994         struct bpf_scratchpad *sp = this_cpu_ptr(&bpf_sp);
1995         u32 diff_size = from_size + to_size;
1996         int i, j = 0;
1997
1998         /* This is quite flexible, some examples:
1999          *
2000          * from_size == 0, to_size > 0,  seed := csum --> pushing data
2001          * from_size > 0,  to_size == 0, seed := csum --> pulling data
2002          * from_size > 0,  to_size > 0,  seed := 0    --> diffing data
2003          *
2004          * Even for diffing, from_size and to_size don't need to be equal.
2005          */
2006         if (unlikely(((from_size | to_size) & (sizeof(__be32) - 1)) ||
2007                      diff_size > sizeof(sp->diff)))
2008                 return -EINVAL;
2009
2010         for (i = 0; i < from_size / sizeof(__be32); i++, j++)
2011                 sp->diff[j] = ~from[i];
2012         for (i = 0; i <   to_size / sizeof(__be32); i++, j++)
2013                 sp->diff[j] = to[i];
2014
2015         return csum_partial(sp->diff, diff_size, seed);
2016 }
2017
2018 static const struct bpf_func_proto bpf_csum_diff_proto = {
2019         .func           = bpf_csum_diff,
2020         .gpl_only       = false,
2021         .pkt_access     = true,
2022         .ret_type       = RET_INTEGER,
2023         .arg1_type      = ARG_PTR_TO_MEM_OR_NULL,
2024         .arg2_type      = ARG_CONST_SIZE_OR_ZERO,
2025         .arg3_type      = ARG_PTR_TO_MEM_OR_NULL,
2026         .arg4_type      = ARG_CONST_SIZE_OR_ZERO,
2027         .arg5_type      = ARG_ANYTHING,
2028 };
2029
2030 BPF_CALL_2(bpf_csum_update, struct sk_buff *, skb, __wsum, csum)
2031 {
2032         /* The interface is to be used in combination with bpf_csum_diff()
2033          * for direct packet writes. csum rotation for alignment as well
2034          * as emulating csum_sub() can be done from the eBPF program.
2035          */
2036         if (skb->ip_summed == CHECKSUM_COMPLETE)
2037                 return (skb->csum = csum_add(skb->csum, csum));
2038
2039         return -ENOTSUPP;
2040 }
2041
2042 static const struct bpf_func_proto bpf_csum_update_proto = {
2043         .func           = bpf_csum_update,
2044         .gpl_only       = false,
2045         .ret_type       = RET_INTEGER,
2046         .arg1_type      = ARG_PTR_TO_CTX,
2047         .arg2_type      = ARG_ANYTHING,
2048 };
2049
2050 BPF_CALL_2(bpf_csum_level, struct sk_buff *, skb, u64, level)
2051 {
2052         /* The interface is to be used in combination with bpf_skb_adjust_room()
2053          * for encap/decap of packet headers when BPF_F_ADJ_ROOM_NO_CSUM_RESET
2054          * is passed as flags, for example.
2055          */
2056         switch (level) {
2057         case BPF_CSUM_LEVEL_INC:
2058                 __skb_incr_checksum_unnecessary(skb);
2059                 break;
2060         case BPF_CSUM_LEVEL_DEC:
2061                 __skb_decr_checksum_unnecessary(skb);
2062                 break;
2063         case BPF_CSUM_LEVEL_RESET:
2064                 __skb_reset_checksum_unnecessary(skb);
2065                 break;
2066         case BPF_CSUM_LEVEL_QUERY:
2067                 return skb->ip_summed == CHECKSUM_UNNECESSARY ?
2068                        skb->csum_level : -EACCES;
2069         default:
2070                 return -EINVAL;
2071         }
2072
2073         return 0;
2074 }
2075
2076 static const struct bpf_func_proto bpf_csum_level_proto = {
2077         .func           = bpf_csum_level,
2078         .gpl_only       = false,
2079         .ret_type       = RET_INTEGER,
2080         .arg1_type      = ARG_PTR_TO_CTX,
2081         .arg2_type      = ARG_ANYTHING,
2082 };
2083
2084 static inline int __bpf_rx_skb(struct net_device *dev, struct sk_buff *skb)
2085 {
2086         return dev_forward_skb(dev, skb);
2087 }
2088
2089 static inline int __bpf_rx_skb_no_mac(struct net_device *dev,
2090                                       struct sk_buff *skb)
2091 {
2092         int ret = ____dev_forward_skb(dev, skb);
2093
2094         if (likely(!ret)) {
2095                 skb->dev = dev;
2096                 ret = netif_rx(skb);
2097         }
2098
2099         return ret;
2100 }
2101
2102 static inline int __bpf_tx_skb(struct net_device *dev, struct sk_buff *skb)
2103 {
2104         int ret;
2105
2106         if (dev_xmit_recursion()) {
2107                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2108                 kfree_skb(skb);
2109                 return -ENETDOWN;
2110         }
2111
2112         skb->dev = dev;
2113         skb->tstamp = 0;
2114
2115         dev_xmit_recursion_inc();
2116         ret = dev_queue_xmit(skb);
2117         dev_xmit_recursion_dec();
2118
2119         return ret;
2120 }
2121
2122 static int __bpf_redirect_no_mac(struct sk_buff *skb, struct net_device *dev,
2123                                  u32 flags)
2124 {
2125         unsigned int mlen = skb_network_offset(skb);
2126
2127         if (mlen) {
2128                 __skb_pull(skb, mlen);
2129
2130                 /* At ingress, the mac header has already been pulled once.
2131                  * At egress, skb_pospull_rcsum has to be done in case that
2132                  * the skb is originated from ingress (i.e. a forwarded skb)
2133                  * to ensure that rcsum starts at net header.
2134                  */
2135                 if (!skb_at_tc_ingress(skb))
2136                         skb_postpull_rcsum(skb, skb_mac_header(skb), mlen);
2137         }
2138         skb_pop_mac_header(skb);
2139         skb_reset_mac_len(skb);
2140         return flags & BPF_F_INGRESS ?
2141                __bpf_rx_skb_no_mac(dev, skb) : __bpf_tx_skb(dev, skb);
2142 }
2143
2144 static int __bpf_redirect_common(struct sk_buff *skb, struct net_device *dev,
2145                                  u32 flags)
2146 {
2147         /* Verify that a link layer header is carried */
2148         if (unlikely(skb->mac_header >= skb->network_header)) {
2149                 kfree_skb(skb);
2150                 return -ERANGE;
2151         }
2152
2153         bpf_push_mac_rcsum(skb);
2154         return flags & BPF_F_INGRESS ?
2155                __bpf_rx_skb(dev, skb) : __bpf_tx_skb(dev, skb);
2156 }
2157
2158 static int __bpf_redirect(struct sk_buff *skb, struct net_device *dev,
2159                           u32 flags)
2160 {
2161         if (dev_is_mac_header_xmit(dev))
2162                 return __bpf_redirect_common(skb, dev, flags);
2163         else
2164                 return __bpf_redirect_no_mac(skb, dev, flags);
2165 }
2166
2167 #if IS_ENABLED(CONFIG_IPV6)
2168 static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb,
2169                             struct net_device *dev, struct bpf_nh_params *nh)
2170 {
2171         u32 hh_len = LL_RESERVED_SPACE(dev);
2172         const struct in6_addr *nexthop;
2173         struct dst_entry *dst = NULL;
2174         struct neighbour *neigh;
2175
2176         if (dev_xmit_recursion()) {
2177                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2178                 goto out_drop;
2179         }
2180
2181         skb->dev = dev;
2182         skb->tstamp = 0;
2183
2184         if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
2185                 struct sk_buff *skb2;
2186
2187                 skb2 = skb_realloc_headroom(skb, hh_len);
2188                 if (unlikely(!skb2)) {
2189                         kfree_skb(skb);
2190                         return -ENOMEM;
2191                 }
2192                 if (skb->sk)
2193                         skb_set_owner_w(skb2, skb->sk);
2194                 consume_skb(skb);
2195                 skb = skb2;
2196         }
2197
2198         rcu_read_lock_bh();
2199         if (!nh) {
2200                 dst = skb_dst(skb);
2201                 nexthop = rt6_nexthop(container_of(dst, struct rt6_info, dst),
2202                                       &ipv6_hdr(skb)->daddr);
2203         } else {
2204                 nexthop = &nh->ipv6_nh;
2205         }
2206         neigh = ip_neigh_gw6(dev, nexthop);
2207         if (likely(!IS_ERR(neigh))) {
2208                 int ret;
2209
2210                 sock_confirm_neigh(skb, neigh);
2211                 dev_xmit_recursion_inc();
2212                 ret = neigh_output(neigh, skb, false);
2213                 dev_xmit_recursion_dec();
2214                 rcu_read_unlock_bh();
2215                 return ret;
2216         }
2217         rcu_read_unlock_bh();
2218         if (dst)
2219                 IP6_INC_STATS(dev_net(dst->dev),
2220                               ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
2221 out_drop:
2222         kfree_skb(skb);
2223         return -ENETDOWN;
2224 }
2225
2226 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev,
2227                                    struct bpf_nh_params *nh)
2228 {
2229         const struct ipv6hdr *ip6h = ipv6_hdr(skb);
2230         struct net *net = dev_net(dev);
2231         int err, ret = NET_XMIT_DROP;
2232
2233         if (!nh) {
2234                 struct dst_entry *dst;
2235                 struct flowi6 fl6 = {
2236                         .flowi6_flags = FLOWI_FLAG_ANYSRC,
2237                         .flowi6_mark  = skb->mark,
2238                         .flowlabel    = ip6_flowinfo(ip6h),
2239                         .flowi6_oif   = dev->ifindex,
2240                         .flowi6_proto = ip6h->nexthdr,
2241                         .daddr        = ip6h->daddr,
2242                         .saddr        = ip6h->saddr,
2243                 };
2244
2245                 dst = ipv6_stub->ipv6_dst_lookup_flow(net, NULL, &fl6, NULL);
2246                 if (IS_ERR(dst))
2247                         goto out_drop;
2248
2249                 skb_dst_set(skb, dst);
2250         } else if (nh->nh_family != AF_INET6) {
2251                 goto out_drop;
2252         }
2253
2254         err = bpf_out_neigh_v6(net, skb, dev, nh);
2255         if (unlikely(net_xmit_eval(err)))
2256                 dev->stats.tx_errors++;
2257         else
2258                 ret = NET_XMIT_SUCCESS;
2259         goto out_xmit;
2260 out_drop:
2261         dev->stats.tx_errors++;
2262         kfree_skb(skb);
2263 out_xmit:
2264         return ret;
2265 }
2266 #else
2267 static int __bpf_redirect_neigh_v6(struct sk_buff *skb, struct net_device *dev,
2268                                    struct bpf_nh_params *nh)
2269 {
2270         kfree_skb(skb);
2271         return NET_XMIT_DROP;
2272 }
2273 #endif /* CONFIG_IPV6 */
2274
2275 #if IS_ENABLED(CONFIG_INET)
2276 static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb,
2277                             struct net_device *dev, struct bpf_nh_params *nh)
2278 {
2279         u32 hh_len = LL_RESERVED_SPACE(dev);
2280         struct neighbour *neigh;
2281         bool is_v6gw = false;
2282
2283         if (dev_xmit_recursion()) {
2284                 net_crit_ratelimited("bpf: recursion limit reached on datapath, buggy bpf program?\n");
2285                 goto out_drop;
2286         }
2287
2288         skb->dev = dev;
2289         skb->tstamp = 0;
2290
2291         if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
2292                 struct sk_buff *skb2;
2293
2294                 skb2 = skb_realloc_headroom(skb, hh_len);
2295                 if (unlikely(!skb2)) {
2296                         kfree_skb(skb);
2297                         return -ENOMEM;
2298                 }
2299                 if (skb->sk)
2300                         skb_set_owner_w(skb2, skb->sk);
2301                 consume_skb(skb);
2302                 skb = skb2;
2303         }
2304
2305         rcu_read_lock_bh();
2306         if (!nh) {
2307                 struct dst_entry *dst = skb_dst(skb);
2308                 struct rtable *rt = container_of(dst, struct rtable, dst);
2309
2310                 neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
2311         } else if (nh->nh_family == AF_INET6) {
2312                 neigh = ip_neigh_gw6(dev, &nh->ipv6_nh);
2313                 is_v6gw = true;
2314         } else if (nh->nh_family == AF_INET) {
2315                 neigh = ip_neigh_gw4(dev, nh->ipv4_nh);
2316         } else {
2317                 rcu_read_unlock_bh();
2318                 goto out_drop;
2319         }
2320
2321         if (likely(!IS_ERR(neigh))) {
2322                 int ret;
2323
2324                 sock_confirm_neigh(skb, neigh);
2325                 dev_xmit_recursion_inc();
2326                 ret = neigh_output(neigh, skb, is_v6gw);
2327                 dev_xmit_recursion_dec();
2328                 rcu_read_unlock_bh();
2329                 return ret;
2330         }
2331         rcu_read_unlock_bh();
2332 out_drop:
2333         kfree_skb(skb);
2334         return -ENETDOWN;
2335 }
2336
2337 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev,
2338                                    struct bpf_nh_params *nh)
2339 {
2340         const struct iphdr *ip4h = ip_hdr(skb);
2341         struct net *net = dev_net(dev);
2342         int err, ret = NET_XMIT_DROP;
2343
2344         if (!nh) {
2345                 struct flowi4 fl4 = {
2346                         .flowi4_flags = FLOWI_FLAG_ANYSRC,
2347                         .flowi4_mark  = skb->mark,
2348                         .flowi4_tos   = RT_TOS(ip4h->tos),
2349                         .flowi4_oif   = dev->ifindex,
2350                         .flowi4_proto = ip4h->protocol,
2351                         .daddr        = ip4h->daddr,
2352                         .saddr        = ip4h->saddr,
2353                 };
2354                 struct rtable *rt;
2355
2356                 rt = ip_route_output_flow(net, &fl4, NULL);
2357                 if (IS_ERR(rt))
2358                         goto out_drop;
2359                 if (rt->rt_type != RTN_UNICAST && rt->rt_type != RTN_LOCAL) {
2360                         ip_rt_put(rt);
2361                         goto out_drop;
2362                 }
2363
2364                 skb_dst_set(skb, &rt->dst);
2365         }
2366
2367         err = bpf_out_neigh_v4(net, skb, dev, nh);
2368         if (unlikely(net_xmit_eval(err)))
2369                 dev->stats.tx_errors++;
2370         else
2371                 ret = NET_XMIT_SUCCESS;
2372         goto out_xmit;
2373 out_drop:
2374         dev->stats.tx_errors++;
2375         kfree_skb(skb);
2376 out_xmit:
2377         return ret;
2378 }
2379 #else
2380 static int __bpf_redirect_neigh_v4(struct sk_buff *skb, struct net_device *dev,
2381                                    struct bpf_nh_params *nh)
2382 {
2383         kfree_skb(skb);
2384         return NET_XMIT_DROP;
2385 }
2386 #endif /* CONFIG_INET */
2387
2388 static int __bpf_redirect_neigh(struct sk_buff *skb, struct net_device *dev,
2389                                 struct bpf_nh_params *nh)
2390 {
2391         struct ethhdr *ethh = eth_hdr(skb);
2392
2393         if (unlikely(skb->mac_header >= skb->network_header))
2394                 goto out;
2395         bpf_push_mac_rcsum(skb);
2396         if (is_multicast_ether_addr(ethh->h_dest))
2397                 goto out;
2398
2399         skb_pull(skb, sizeof(*ethh));
2400         skb_unset_mac_header(skb);
2401         skb_reset_network_header(skb);
2402
2403         if (skb->protocol == htons(ETH_P_IP))
2404                 return __bpf_redirect_neigh_v4(skb, dev, nh);
2405         else if (skb->protocol == htons(ETH_P_IPV6))
2406                 return __bpf_redirect_neigh_v6(skb, dev, nh);
2407 out:
2408         kfree_skb(skb);
2409         return -ENOTSUPP;
2410 }
2411
2412 /* Internal, non-exposed redirect flags. */
2413 enum {
2414         BPF_F_NEIGH     = (1ULL << 1),
2415         BPF_F_PEER      = (1ULL << 2),
2416         BPF_F_NEXTHOP   = (1ULL << 3),
2417 #define BPF_F_REDIRECT_INTERNAL (BPF_F_NEIGH | BPF_F_PEER | BPF_F_NEXTHOP)
2418 };
2419
2420 BPF_CALL_3(bpf_clone_redirect, struct sk_buff *, skb, u32, ifindex, u64, flags)
2421 {
2422         struct net_device *dev;
2423         struct sk_buff *clone;
2424         int ret;
2425
2426         if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL)))
2427                 return -EINVAL;
2428
2429         dev = dev_get_by_index_rcu(dev_net(skb->dev), ifindex);
2430         if (unlikely(!dev))
2431                 return -EINVAL;
2432
2433         clone = skb_clone(skb, GFP_ATOMIC);
2434         if (unlikely(!clone))
2435                 return -ENOMEM;
2436
2437         /* For direct write, we need to keep the invariant that the skbs
2438          * we're dealing with need to be uncloned. Should uncloning fail
2439          * here, we need to free the just generated clone to unclone once
2440          * again.
2441          */
2442         ret = bpf_try_make_head_writable(skb);
2443         if (unlikely(ret)) {
2444                 kfree_skb(clone);
2445                 return -ENOMEM;
2446         }
2447
2448         return __bpf_redirect(clone, dev, flags);
2449 }
2450
2451 static const struct bpf_func_proto bpf_clone_redirect_proto = {
2452         .func           = bpf_clone_redirect,
2453         .gpl_only       = false,
2454         .ret_type       = RET_INTEGER,
2455         .arg1_type      = ARG_PTR_TO_CTX,
2456         .arg2_type      = ARG_ANYTHING,
2457         .arg3_type      = ARG_ANYTHING,
2458 };
2459
2460 DEFINE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
2461 EXPORT_PER_CPU_SYMBOL_GPL(bpf_redirect_info);
2462
2463 int skb_do_redirect(struct sk_buff *skb)
2464 {
2465         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2466         struct net *net = dev_net(skb->dev);
2467         struct net_device *dev;
2468         u32 flags = ri->flags;
2469
2470         dev = dev_get_by_index_rcu(net, ri->tgt_index);
2471         ri->tgt_index = 0;
2472         ri->flags = 0;
2473         if (unlikely(!dev))
2474                 goto out_drop;
2475         if (flags & BPF_F_PEER) {
2476                 const struct net_device_ops *ops = dev->netdev_ops;
2477
2478                 if (unlikely(!ops->ndo_get_peer_dev ||
2479                              !skb_at_tc_ingress(skb)))
2480                         goto out_drop;
2481                 dev = ops->ndo_get_peer_dev(dev);
2482                 if (unlikely(!dev ||
2483                              !is_skb_forwardable(dev, skb) ||
2484                              net_eq(net, dev_net(dev))))
2485                         goto out_drop;
2486                 skb->dev = dev;
2487                 return -EAGAIN;
2488         }
2489         return flags & BPF_F_NEIGH ?
2490                __bpf_redirect_neigh(skb, dev, flags & BPF_F_NEXTHOP ?
2491                                     &ri->nh : NULL) :
2492                __bpf_redirect(skb, dev, flags);
2493 out_drop:
2494         kfree_skb(skb);
2495         return -EINVAL;
2496 }
2497
2498 BPF_CALL_2(bpf_redirect, u32, ifindex, u64, flags)
2499 {
2500         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2501
2502         if (unlikely(flags & (~(BPF_F_INGRESS) | BPF_F_REDIRECT_INTERNAL)))
2503                 return TC_ACT_SHOT;
2504
2505         ri->flags = flags;
2506         ri->tgt_index = ifindex;
2507
2508         return TC_ACT_REDIRECT;
2509 }
2510
2511 static const struct bpf_func_proto bpf_redirect_proto = {
2512         .func           = bpf_redirect,
2513         .gpl_only       = false,
2514         .ret_type       = RET_INTEGER,
2515         .arg1_type      = ARG_ANYTHING,
2516         .arg2_type      = ARG_ANYTHING,
2517 };
2518
2519 BPF_CALL_2(bpf_redirect_peer, u32, ifindex, u64, flags)
2520 {
2521         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2522
2523         if (unlikely(flags))
2524                 return TC_ACT_SHOT;
2525
2526         ri->flags = BPF_F_PEER;
2527         ri->tgt_index = ifindex;
2528
2529         return TC_ACT_REDIRECT;
2530 }
2531
2532 static const struct bpf_func_proto bpf_redirect_peer_proto = {
2533         .func           = bpf_redirect_peer,
2534         .gpl_only       = false,
2535         .ret_type       = RET_INTEGER,
2536         .arg1_type      = ARG_ANYTHING,
2537         .arg2_type      = ARG_ANYTHING,
2538 };
2539
2540 BPF_CALL_4(bpf_redirect_neigh, u32, ifindex, struct bpf_redir_neigh *, params,
2541            int, plen, u64, flags)
2542 {
2543         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
2544
2545         if (unlikely((plen && plen < sizeof(*params)) || flags))
2546                 return TC_ACT_SHOT;
2547
2548         ri->flags = BPF_F_NEIGH | (plen ? BPF_F_NEXTHOP : 0);
2549         ri->tgt_index = ifindex;
2550
2551         BUILD_BUG_ON(sizeof(struct bpf_redir_neigh) != sizeof(struct bpf_nh_params));
2552         if (plen)
2553                 memcpy(&ri->nh, params, sizeof(ri->nh));
2554
2555         return TC_ACT_REDIRECT;
2556 }
2557
2558 static const struct bpf_func_proto bpf_redirect_neigh_proto = {
2559         .func           = bpf_redirect_neigh,
2560         .gpl_only       = false,
2561         .ret_type       = RET_INTEGER,
2562         .arg1_type      = ARG_ANYTHING,
2563         .arg2_type      = ARG_PTR_TO_MEM_OR_NULL,
2564         .arg3_type      = ARG_CONST_SIZE_OR_ZERO,
2565         .arg4_type      = ARG_ANYTHING,
2566 };
2567
2568 BPF_CALL_2(bpf_msg_apply_bytes, struct sk_msg *, msg, u32, bytes)
2569 {
2570         msg->apply_bytes = bytes;
2571         return 0;
2572 }
2573
2574 static const struct bpf_func_proto bpf_msg_apply_bytes_proto = {
2575         .func           = bpf_msg_apply_bytes,
2576         .gpl_only       = false,
2577         .ret_type       = RET_INTEGER,
2578         .arg1_type      = ARG_PTR_TO_CTX,
2579         .arg2_type      = ARG_ANYTHING,
2580 };
2581
2582 BPF_CALL_2(bpf_msg_cork_bytes, struct sk_msg *, msg, u32, bytes)
2583 {
2584         msg->cork_bytes = bytes;
2585         return 0;
2586 }
2587
2588 static const struct bpf_func_proto bpf_msg_cork_bytes_proto = {
2589         .func           = bpf_msg_cork_bytes,
2590         .gpl_only       = false,
2591         .ret_type       = RET_INTEGER,
2592         .arg1_type      = ARG_PTR_TO_CTX,
2593         .arg2_type      = ARG_ANYTHING,
2594 };
2595
2596 BPF_CALL_4(bpf_msg_pull_data, struct sk_msg *, msg, u32, start,
2597            u32, end, u64, flags)
2598 {
2599         u32 len = 0, offset = 0, copy = 0, poffset = 0, bytes = end - start;
2600         u32 first_sge, last_sge, i, shift, bytes_sg_total;
2601         struct scatterlist *sge;
2602         u8 *raw, *to, *from;
2603         struct page *page;
2604
2605         if (unlikely(flags || end <= start))
2606                 return -EINVAL;
2607
2608         /* First find the starting scatterlist element */
2609         i = msg->sg.start;
2610         do {
2611                 offset += len;
2612                 len = sk_msg_elem(msg, i)->length;
2613                 if (start < offset + len)
2614                         break;
2615                 sk_msg_iter_var_next(i);
2616         } while (i != msg->sg.end);
2617
2618         if (unlikely(start >= offset + len))
2619                 return -EINVAL;
2620
2621         first_sge = i;
2622         /* The start may point into the sg element so we need to also
2623          * account for the headroom.
2624          */
2625         bytes_sg_total = start - offset + bytes;
2626         if (!test_bit(i, &msg->sg.copy) && bytes_sg_total <= len)
2627                 goto out;
2628
2629         /* At this point we need to linearize multiple scatterlist
2630          * elements or a single shared page. Either way we need to
2631          * copy into a linear buffer exclusively owned by BPF. Then
2632          * place the buffer in the scatterlist and fixup the original
2633          * entries by removing the entries now in the linear buffer
2634          * and shifting the remaining entries. For now we do not try
2635          * to copy partial entries to avoid complexity of running out
2636          * of sg_entry slots. The downside is reading a single byte
2637          * will copy the entire sg entry.
2638          */
2639         do {
2640                 copy += sk_msg_elem(msg, i)->length;
2641                 sk_msg_iter_var_next(i);
2642                 if (bytes_sg_total <= copy)
2643                         break;
2644         } while (i != msg->sg.end);
2645         last_sge = i;
2646
2647         if (unlikely(bytes_sg_total > copy))
2648                 return -EINVAL;
2649
2650         page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2651                            get_order(copy));
2652         if (unlikely(!page))
2653                 return -ENOMEM;
2654
2655         raw = page_address(page);
2656         i = first_sge;
2657         do {
2658                 sge = sk_msg_elem(msg, i);
2659                 from = sg_virt(sge);
2660                 len = sge->length;
2661                 to = raw + poffset;
2662
2663                 memcpy(to, from, len);
2664                 poffset += len;
2665                 sge->length = 0;
2666                 put_page(sg_page(sge));
2667
2668                 sk_msg_iter_var_next(i);
2669         } while (i != last_sge);
2670
2671         sg_set_page(&msg->sg.data[first_sge], page, copy, 0);
2672
2673         /* To repair sg ring we need to shift entries. If we only
2674          * had a single entry though we can just replace it and
2675          * be done. Otherwise walk the ring and shift the entries.
2676          */
2677         WARN_ON_ONCE(last_sge == first_sge);
2678         shift = last_sge > first_sge ?
2679                 last_sge - first_sge - 1 :
2680                 NR_MSG_FRAG_IDS - first_sge + last_sge - 1;
2681         if (!shift)
2682                 goto out;
2683
2684         i = first_sge;
2685         sk_msg_iter_var_next(i);
2686         do {
2687                 u32 move_from;
2688
2689                 if (i + shift >= NR_MSG_FRAG_IDS)
2690                         move_from = i + shift - NR_MSG_FRAG_IDS;
2691                 else
2692                         move_from = i + shift;
2693                 if (move_from == msg->sg.end)
2694                         break;
2695
2696                 msg->sg.data[i] = msg->sg.data[move_from];
2697                 msg->sg.data[move_from].length = 0;
2698                 msg->sg.data[move_from].page_link = 0;
2699                 msg->sg.data[move_from].offset = 0;
2700                 sk_msg_iter_var_next(i);
2701         } while (1);
2702
2703         msg->sg.end = msg->sg.end - shift > msg->sg.end ?
2704                       msg->sg.end - shift + NR_MSG_FRAG_IDS :
2705                       msg->sg.end - shift;
2706 out:
2707         msg->data = sg_virt(&msg->sg.data[first_sge]) + start - offset;
2708         msg->data_end = msg->data + bytes;
2709         return 0;
2710 }
2711
2712 static const struct bpf_func_proto bpf_msg_pull_data_proto = {
2713         .func           = bpf_msg_pull_data,
2714         .gpl_only       = false,
2715         .ret_type       = RET_INTEGER,
2716         .arg1_type      = ARG_PTR_TO_CTX,
2717         .arg2_type      = ARG_ANYTHING,
2718         .arg3_type      = ARG_ANYTHING,
2719         .arg4_type      = ARG_ANYTHING,
2720 };
2721
2722 BPF_CALL_4(bpf_msg_push_data, struct sk_msg *, msg, u32, start,
2723            u32, len, u64, flags)
2724 {
2725         struct scatterlist sge, nsge, nnsge, rsge = {0}, *psge;
2726         u32 new, i = 0, l = 0, space, copy = 0, offset = 0;
2727         u8 *raw, *to, *from;
2728         struct page *page;
2729
2730         if (unlikely(flags))
2731                 return -EINVAL;
2732
2733         /* First find the starting scatterlist element */
2734         i = msg->sg.start;
2735         do {
2736                 offset += l;
2737                 l = sk_msg_elem(msg, i)->length;
2738
2739                 if (start < offset + l)
2740                         break;
2741                 sk_msg_iter_var_next(i);
2742         } while (i != msg->sg.end);
2743
2744         if (start >= offset + l)
2745                 return -EINVAL;
2746
2747         space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2748
2749         /* If no space available will fallback to copy, we need at
2750          * least one scatterlist elem available to push data into
2751          * when start aligns to the beginning of an element or two
2752          * when it falls inside an element. We handle the start equals
2753          * offset case because its the common case for inserting a
2754          * header.
2755          */
2756         if (!space || (space == 1 && start != offset))
2757                 copy = msg->sg.data[i].length;
2758
2759         page = alloc_pages(__GFP_NOWARN | GFP_ATOMIC | __GFP_COMP,
2760                            get_order(copy + len));
2761         if (unlikely(!page))
2762                 return -ENOMEM;
2763
2764         if (copy) {
2765                 int front, back;
2766
2767                 raw = page_address(page);
2768
2769                 psge = sk_msg_elem(msg, i);
2770                 front = start - offset;
2771                 back = psge->length - front;
2772                 from = sg_virt(psge);
2773
2774                 if (front)
2775                         memcpy(raw, from, front);
2776
2777                 if (back) {
2778                         from += front;
2779                         to = raw + front + len;
2780
2781                         memcpy(to, from, back);
2782                 }
2783
2784                 put_page(sg_page(psge));
2785         } else if (start - offset) {
2786                 psge = sk_msg_elem(msg, i);
2787                 rsge = sk_msg_elem_cpy(msg, i);
2788
2789                 psge->length = start - offset;
2790                 rsge.length -= psge->length;
2791                 rsge.offset += start;
2792
2793                 sk_msg_iter_var_next(i);
2794                 sg_unmark_end(psge);
2795                 sg_unmark_end(&rsge);
2796                 sk_msg_iter_next(msg, end);
2797         }
2798
2799         /* Slot(s) to place newly allocated data */
2800         new = i;
2801
2802         /* Shift one or two slots as needed */
2803         if (!copy) {
2804                 sge = sk_msg_elem_cpy(msg, i);
2805
2806                 sk_msg_iter_var_next(i);
2807                 sg_unmark_end(&sge);
2808                 sk_msg_iter_next(msg, end);
2809
2810                 nsge = sk_msg_elem_cpy(msg, i);
2811                 if (rsge.length) {
2812                         sk_msg_iter_var_next(i);
2813                         nnsge = sk_msg_elem_cpy(msg, i);
2814                 }
2815
2816                 while (i != msg->sg.end) {
2817                         msg->sg.data[i] = sge;
2818                         sge = nsge;
2819                         sk_msg_iter_var_next(i);
2820                         if (rsge.length) {
2821                                 nsge = nnsge;
2822                                 nnsge = sk_msg_elem_cpy(msg, i);
2823                         } else {
2824                                 nsge = sk_msg_elem_cpy(msg, i);
2825                         }
2826                 }
2827         }
2828
2829         /* Place newly allocated data buffer */
2830         sk_mem_charge(msg->sk, len);
2831         msg->sg.size += len;
2832         __clear_bit(new, &msg->sg.copy);
2833         sg_set_page(&msg->sg.data[new], page, len + copy, 0);
2834         if (rsge.length) {
2835                 get_page(sg_page(&rsge));
2836                 sk_msg_iter_var_next(new);
2837                 msg->sg.data[new] = rsge;
2838         }
2839
2840         sk_msg_compute_data_pointers(msg);
2841         return 0;
2842 }
2843
2844 static const struct bpf_func_proto bpf_msg_push_data_proto = {
2845         .func           = bpf_msg_push_data,
2846         .gpl_only       = false,
2847         .ret_type       = RET_INTEGER,
2848         .arg1_type      = ARG_PTR_TO_CTX,
2849         .arg2_type      = ARG_ANYTHING,
2850         .arg3_type      = ARG_ANYTHING,
2851         .arg4_type      = ARG_ANYTHING,
2852 };
2853
2854 static void sk_msg_shift_left(struct sk_msg *msg, int i)
2855 {
2856         int prev;
2857
2858         do {
2859                 prev = i;
2860                 sk_msg_iter_var_next(i);
2861                 msg->sg.data[prev] = msg->sg.data[i];
2862         } while (i != msg->sg.end);
2863
2864         sk_msg_iter_prev(msg, end);
2865 }
2866
2867 static void sk_msg_shift_right(struct sk_msg *msg, int i)
2868 {
2869         struct scatterlist tmp, sge;
2870
2871         sk_msg_iter_next(msg, end);
2872         sge = sk_msg_elem_cpy(msg, i);
2873         sk_msg_iter_var_next(i);
2874         tmp = sk_msg_elem_cpy(msg, i);
2875
2876         while (i != msg->sg.end) {
2877                 msg->sg.data[i] = sge;
2878                 sk_msg_iter_var_next(i);
2879                 sge = tmp;
2880                 tmp = sk_msg_elem_cpy(msg, i);
2881         }
2882 }
2883
2884 BPF_CALL_4(bpf_msg_pop_data, struct sk_msg *, msg, u32, start,
2885            u32, len, u64, flags)
2886 {
2887         u32 i = 0, l = 0, space, offset = 0;
2888         u64 last = start + len;
2889         int pop;
2890
2891         if (unlikely(flags))
2892                 return -EINVAL;
2893
2894         /* First find the starting scatterlist element */
2895         i = msg->sg.start;
2896         do {
2897                 offset += l;
2898                 l = sk_msg_elem(msg, i)->length;
2899
2900                 if (start < offset + l)
2901                         break;
2902                 sk_msg_iter_var_next(i);
2903         } while (i != msg->sg.end);
2904
2905         /* Bounds checks: start and pop must be inside message */
2906         if (start >= offset + l || last >= msg->sg.size)
2907                 return -EINVAL;
2908
2909         space = MAX_MSG_FRAGS - sk_msg_elem_used(msg);
2910
2911         pop = len;
2912         /* --------------| offset
2913          * -| start      |-------- len -------|
2914          *
2915          *  |----- a ----|-------- pop -------|----- b ----|
2916          *  |______________________________________________| length
2917          *
2918          *
2919          * a:   region at front of scatter element to save
2920          * b:   region at back of scatter element to save when length > A + pop
2921          * pop: region to pop from element, same as input 'pop' here will be
2922          *      decremented below per iteration.
2923          *
2924          * Two top-level cases to handle when start != offset, first B is non
2925          * zero and second B is zero corresponding to when a pop includes more
2926          * than one element.
2927          *
2928          * Then if B is non-zero AND there is no space allocate space and
2929          * compact A, B regions into page. If there is space shift ring to
2930          * the rigth free'ing the next element in ring to place B, leaving
2931          * A untouched except to reduce length.
2932          */
2933         if (start != offset) {
2934                 struct scatterlist *nsge, *sge = sk_msg_elem(msg, i);
2935                 int a = start;
2936                 int b = sge->length - pop - a;
2937
2938                 sk_msg_iter_var_next(i);
2939
2940                 if (pop < sge->length - a) {
2941                         if (space) {
2942                                 sge->length = a;
2943                                 sk_msg_shift_right(msg, i);
2944                                 nsge = sk_msg_elem(msg, i);
2945                                 get_page(sg_page(sge));
2946                                 sg_set_page(nsge,
2947                                             sg_page(sge),
2948                                             b, sge->offset + pop + a);
2949                         } else {
2950                                 struct page *page, *orig;
2951                                 u8 *to, *from;
2952
2953                                 page = alloc_pages(__GFP_NOWARN |
2954                                                    __GFP_COMP   | GFP_ATOMIC,
2955                                                    get_order(a + b));
2956                                 if (unlikely(!page))
2957                                         return -ENOMEM;
2958
2959                                 sge->length = a;
2960                                 orig = sg_page(sge);
2961                                 from = sg_virt(sge);
2962                                 to = page_address(page);
2963                                 memcpy(to, from, a);
2964                                 memcpy(to + a, from + a + pop, b);
2965                                 sg_set_page(sge, page, a + b, 0);
2966                                 put_page(orig);
2967                         }
2968                         pop = 0;
2969                 } else if (pop >= sge->length - a) {
2970                         pop -= (sge->length - a);
2971                         sge->length = a;
2972                 }
2973         }
2974
2975         /* From above the current layout _must_ be as follows,
2976          *
2977          * -| offset
2978          * -| start
2979          *
2980          *  |---- pop ---|---------------- b ------------|
2981          *  |____________________________________________| length
2982          *
2983          * Offset and start of the current msg elem are equal because in the
2984          * previous case we handled offset != start and either consumed the
2985          * entire element and advanced to the next element OR pop == 0.
2986          *
2987          * Two cases to handle here are first pop is less than the length
2988          * leaving some remainder b above. Simply adjust the element's layout
2989          * in this case. Or pop >= length of the element so that b = 0. In this
2990          * case advance to next element decrementing pop.
2991          */
2992         while (pop) {
2993                 struct scatterlist *sge = sk_msg_elem(msg, i);
2994
2995                 if (pop < sge->length) {
2996                         sge->length -= pop;
2997                         sge->offset += pop;
2998                         pop = 0;
2999                 } else {
3000                         pop -= sge->length;
3001                         sk_msg_shift_left(msg, i);
3002                 }
3003                 sk_msg_iter_var_next(i);
3004         }
3005
3006         sk_mem_uncharge(msg->sk, len - pop);
3007         msg->sg.size -= (len - pop);
3008         sk_msg_compute_data_pointers(msg);
3009         return 0;
3010 }
3011
3012 static const struct bpf_func_proto bpf_msg_pop_data_proto = {
3013         .func           = bpf_msg_pop_data,
3014         .gpl_only       = false,
3015         .ret_type       = RET_INTEGER,
3016         .arg1_type      = ARG_PTR_TO_CTX,
3017         .arg2_type      = ARG_ANYTHING,
3018         .arg3_type      = ARG_ANYTHING,
3019         .arg4_type      = ARG_ANYTHING,
3020 };
3021
3022 #ifdef CONFIG_CGROUP_NET_CLASSID
3023 BPF_CALL_0(bpf_get_cgroup_classid_curr)
3024 {
3025         return __task_get_classid(current);
3026 }
3027
3028 static const struct bpf_func_proto bpf_get_cgroup_classid_curr_proto = {
3029         .func           = bpf_get_cgroup_classid_curr,
3030         .gpl_only       = false,
3031         .ret_type       = RET_INTEGER,
3032 };
3033
3034 BPF_CALL_1(bpf_skb_cgroup_classid, const struct sk_buff *, skb)
3035 {
3036         struct sock *sk = skb_to_full_sk(skb);
3037
3038         if (!sk || !sk_fullsock(sk))
3039                 return 0;
3040
3041         return sock_cgroup_classid(&sk->sk_cgrp_data);
3042 }
3043
3044 static const struct bpf_func_proto bpf_skb_cgroup_classid_proto = {
3045         .func           = bpf_skb_cgroup_classid,
3046         .gpl_only       = false,
3047         .ret_type       = RET_INTEGER,
3048         .arg1_type      = ARG_PTR_TO_CTX,
3049 };
3050 #endif
3051
3052 BPF_CALL_1(bpf_get_cgroup_classid, const struct sk_buff *, skb)
3053 {
3054         return task_get_classid(skb);
3055 }
3056
3057 static const struct bpf_func_proto bpf_get_cgroup_classid_proto = {
3058         .func           = bpf_get_cgroup_classid,
3059         .gpl_only       = false,
3060         .ret_type       = RET_INTEGER,
3061         .arg1_type      = ARG_PTR_TO_CTX,
3062 };
3063
3064 BPF_CALL_1(bpf_get_route_realm, const struct sk_buff *, skb)
3065 {
3066         return dst_tclassid(skb);
3067 }
3068
3069 static const struct bpf_func_proto bpf_get_route_realm_proto = {
3070         .func           = bpf_get_route_realm,
3071         .gpl_only       = false,
3072         .ret_type       = RET_INTEGER,
3073         .arg1_type      = ARG_PTR_TO_CTX,
3074 };
3075
3076 BPF_CALL_1(bpf_get_hash_recalc, struct sk_buff *, skb)
3077 {
3078         /* If skb_clear_hash() was called due to mangling, we can
3079          * trigger SW recalculation here. Later access to hash
3080          * can then use the inline skb->hash via context directly
3081          * instead of calling this helper again.
3082          */
3083         return skb_get_hash(skb);
3084 }
3085
3086 static const struct bpf_func_proto bpf_get_hash_recalc_proto = {
3087         .func           = bpf_get_hash_recalc,
3088         .gpl_only       = false,
3089         .ret_type       = RET_INTEGER,
3090         .arg1_type      = ARG_PTR_TO_CTX,
3091 };
3092
3093 BPF_CALL_1(bpf_set_hash_invalid, struct sk_buff *, skb)
3094 {
3095         /* After all direct packet write, this can be used once for
3096          * triggering a lazy recalc on next skb_get_hash() invocation.
3097          */
3098         skb_clear_hash(skb);
3099         return 0;
3100 }
3101
3102 static const struct bpf_func_proto bpf_set_hash_invalid_proto = {
3103         .func           = bpf_set_hash_invalid,
3104         .gpl_only       = false,
3105         .ret_type       = RET_INTEGER,
3106         .arg1_type      = ARG_PTR_TO_CTX,
3107 };
3108
3109 BPF_CALL_2(bpf_set_hash, struct sk_buff *, skb, u32, hash)
3110 {
3111         /* Set user specified hash as L4(+), so that it gets returned
3112          * on skb_get_hash() call unless BPF prog later on triggers a
3113          * skb_clear_hash().
3114          */
3115         __skb_set_sw_hash(skb, hash, true);
3116         return 0;
3117 }
3118
3119 static const struct bpf_func_proto bpf_set_hash_proto = {
3120         .func           = bpf_set_hash,
3121         .gpl_only       = false,
3122         .ret_type       = RET_INTEGER,
3123         .arg1_type      = ARG_PTR_TO_CTX,
3124         .arg2_type      = ARG_ANYTHING,
3125 };
3126
3127 BPF_CALL_3(bpf_skb_vlan_push, struct sk_buff *, skb, __be16, vlan_proto,
3128            u16, vlan_tci)
3129 {
3130         int ret;
3131
3132         if (unlikely(vlan_proto != htons(ETH_P_8021Q) &&
3133                      vlan_proto != htons(ETH_P_8021AD)))
3134                 vlan_proto = htons(ETH_P_8021Q);
3135
3136         bpf_push_mac_rcsum(skb);
3137         ret = skb_vlan_push(skb, vlan_proto, vlan_tci);
3138         bpf_pull_mac_rcsum(skb);
3139
3140         bpf_compute_data_pointers(skb);
3141         return ret;
3142 }
3143
3144 static const struct bpf_func_proto bpf_skb_vlan_push_proto = {
3145         .func           = bpf_skb_vlan_push,
3146         .gpl_only       = false,
3147         .ret_type       = RET_INTEGER,
3148         .arg1_type      = ARG_PTR_TO_CTX,
3149         .arg2_type      = ARG_ANYTHING,
3150         .arg3_type      = ARG_ANYTHING,
3151 };
3152
3153 BPF_CALL_1(bpf_skb_vlan_pop, struct sk_buff *, skb)
3154 {
3155         int ret;
3156
3157         bpf_push_mac_rcsum(skb);
3158         ret = skb_vlan_pop(skb);
3159         bpf_pull_mac_rcsum(skb);
3160
3161         bpf_compute_data_pointers(skb);
3162         return ret;
3163 }
3164
3165 static const struct bpf_func_proto bpf_skb_vlan_pop_proto = {
3166         .func           = bpf_skb_vlan_pop,
3167         .gpl_only       = false,
3168         .ret_type       = RET_INTEGER,
3169         .arg1_type      = ARG_PTR_TO_CTX,
3170 };
3171
3172 static int bpf_skb_generic_push(struct sk_buff *skb, u32 off, u32 len)
3173 {
3174         /* Caller already did skb_cow() with len as headroom,
3175          * so no need to do it here.
3176          */
3177         skb_push(skb, len);
3178         memmove(skb->data, skb->data + len, off);
3179         memset(skb->data + off, 0, len);
3180
3181         /* No skb_postpush_rcsum(skb, skb->data + off, len)
3182          * needed here as it does not change the skb->csum
3183          * result for checksum complete when summing over
3184          * zeroed blocks.
3185          */
3186         return 0;
3187 }
3188
3189 static int bpf_skb_generic_pop(struct sk_buff *skb, u32 off, u32 len)
3190 {
3191         /* skb_ensure_writable() is not needed here, as we're
3192          * already working on an uncloned skb.
3193          */
3194         if (unlikely(!pskb_may_pull(skb, off + len)))
3195                 return -ENOMEM;
3196
3197         skb_postpull_rcsum(skb, skb->data + off, len);
3198         memmove(skb->data + len, skb->data, off);
3199         __skb_pull(skb, len);
3200
3201         return 0;
3202 }
3203
3204 static int bpf_skb_net_hdr_push(struct sk_buff *skb, u32 off, u32 len)
3205 {
3206         bool trans_same = skb->transport_header == skb->network_header;
3207         int ret;
3208
3209         /* There's no need for __skb_push()/__skb_pull() pair to
3210          * get to the start of the mac header as we're guaranteed
3211          * to always start from here under eBPF.
3212          */
3213         ret = bpf_skb_generic_push(skb, off, len);
3214         if (likely(!ret)) {
3215                 skb->mac_header -= len;
3216                 skb->network_header -= len;
3217                 if (trans_same)
3218                         skb->transport_header = skb->network_header;
3219         }
3220
3221         return ret;
3222 }
3223
3224 static int bpf_skb_net_hdr_pop(struct sk_buff *skb, u32 off, u32 len)
3225 {
3226         bool trans_same = skb->transport_header == skb->network_header;
3227         int ret;
3228
3229         /* Same here, __skb_push()/__skb_pull() pair not needed. */
3230         ret = bpf_skb_generic_pop(skb, off, len);
3231         if (likely(!ret)) {
3232                 skb->mac_header += len;
3233                 skb->network_header += len;
3234                 if (trans_same)
3235                         skb->transport_header = skb->network_header;
3236         }
3237
3238         return ret;
3239 }
3240
3241 static int bpf_skb_proto_4_to_6(struct sk_buff *skb)
3242 {
3243         const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
3244         u32 off = skb_mac_header_len(skb);
3245         int ret;
3246
3247         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb))
3248                 return -ENOTSUPP;
3249
3250         ret = skb_cow(skb, len_diff);
3251         if (unlikely(ret < 0))
3252                 return ret;
3253
3254         ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3255         if (unlikely(ret < 0))
3256                 return ret;
3257
3258         if (skb_is_gso(skb)) {
3259                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3260
3261                 /* SKB_GSO_TCPV4 needs to be changed into
3262                  * SKB_GSO_TCPV6.
3263                  */
3264                 if (shinfo->gso_type & SKB_GSO_TCPV4) {
3265                         shinfo->gso_type &= ~SKB_GSO_TCPV4;
3266                         shinfo->gso_type |=  SKB_GSO_TCPV6;
3267                 }
3268
3269                 /* Due to IPv6 header, MSS needs to be downgraded. */
3270                 skb_decrease_gso_size(shinfo, len_diff);
3271                 /* Header must be checked, and gso_segs recomputed. */
3272                 shinfo->gso_type |= SKB_GSO_DODGY;
3273                 shinfo->gso_segs = 0;
3274         }
3275
3276         skb->protocol = htons(ETH_P_IPV6);
3277         skb_clear_hash(skb);
3278
3279         return 0;
3280 }
3281
3282 static int bpf_skb_proto_6_to_4(struct sk_buff *skb)
3283 {
3284         const u32 len_diff = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
3285         u32 off = skb_mac_header_len(skb);
3286         int ret;
3287
3288         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb))
3289                 return -ENOTSUPP;
3290
3291         ret = skb_unclone(skb, GFP_ATOMIC);
3292         if (unlikely(ret < 0))
3293                 return ret;
3294
3295         ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3296         if (unlikely(ret < 0))
3297                 return ret;
3298
3299         if (skb_is_gso(skb)) {
3300                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3301
3302                 /* SKB_GSO_TCPV6 needs to be changed into
3303                  * SKB_GSO_TCPV4.
3304                  */
3305                 if (shinfo->gso_type & SKB_GSO_TCPV6) {
3306                         shinfo->gso_type &= ~SKB_GSO_TCPV6;
3307                         shinfo->gso_type |=  SKB_GSO_TCPV4;
3308                 }
3309
3310                 /* Due to IPv4 header, MSS can be upgraded. */
3311                 skb_increase_gso_size(shinfo, len_diff);
3312                 /* Header must be checked, and gso_segs recomputed. */
3313                 shinfo->gso_type |= SKB_GSO_DODGY;
3314                 shinfo->gso_segs = 0;
3315         }
3316
3317         skb->protocol = htons(ETH_P_IP);
3318         skb_clear_hash(skb);
3319
3320         return 0;
3321 }
3322
3323 static int bpf_skb_proto_xlat(struct sk_buff *skb, __be16 to_proto)
3324 {
3325         __be16 from_proto = skb->protocol;
3326
3327         if (from_proto == htons(ETH_P_IP) &&
3328               to_proto == htons(ETH_P_IPV6))
3329                 return bpf_skb_proto_4_to_6(skb);
3330
3331         if (from_proto == htons(ETH_P_IPV6) &&
3332               to_proto == htons(ETH_P_IP))
3333                 return bpf_skb_proto_6_to_4(skb);
3334
3335         return -ENOTSUPP;
3336 }
3337
3338 BPF_CALL_3(bpf_skb_change_proto, struct sk_buff *, skb, __be16, proto,
3339            u64, flags)
3340 {
3341         int ret;
3342
3343         if (unlikely(flags))
3344                 return -EINVAL;
3345
3346         /* General idea is that this helper does the basic groundwork
3347          * needed for changing the protocol, and eBPF program fills the
3348          * rest through bpf_skb_store_bytes(), bpf_lX_csum_replace()
3349          * and other helpers, rather than passing a raw buffer here.
3350          *
3351          * The rationale is to keep this minimal and without a need to
3352          * deal with raw packet data. F.e. even if we would pass buffers
3353          * here, the program still needs to call the bpf_lX_csum_replace()
3354          * helpers anyway. Plus, this way we keep also separation of
3355          * concerns, since f.e. bpf_skb_store_bytes() should only take
3356          * care of stores.
3357          *
3358          * Currently, additional options and extension header space are
3359          * not supported, but flags register is reserved so we can adapt
3360          * that. For offloads, we mark packet as dodgy, so that headers
3361          * need to be verified first.
3362          */
3363         ret = bpf_skb_proto_xlat(skb, proto);
3364         bpf_compute_data_pointers(skb);
3365         return ret;
3366 }
3367
3368 static const struct bpf_func_proto bpf_skb_change_proto_proto = {
3369         .func           = bpf_skb_change_proto,
3370         .gpl_only       = false,
3371         .ret_type       = RET_INTEGER,
3372         .arg1_type      = ARG_PTR_TO_CTX,
3373         .arg2_type      = ARG_ANYTHING,
3374         .arg3_type      = ARG_ANYTHING,
3375 };
3376
3377 BPF_CALL_2(bpf_skb_change_type, struct sk_buff *, skb, u32, pkt_type)
3378 {
3379         /* We only allow a restricted subset to be changed for now. */
3380         if (unlikely(!skb_pkt_type_ok(skb->pkt_type) ||
3381                      !skb_pkt_type_ok(pkt_type)))
3382                 return -EINVAL;
3383
3384         skb->pkt_type = pkt_type;
3385         return 0;
3386 }
3387
3388 static const struct bpf_func_proto bpf_skb_change_type_proto = {
3389         .func           = bpf_skb_change_type,
3390         .gpl_only       = false,
3391         .ret_type       = RET_INTEGER,
3392         .arg1_type      = ARG_PTR_TO_CTX,
3393         .arg2_type      = ARG_ANYTHING,
3394 };
3395
3396 static u32 bpf_skb_net_base_len(const struct sk_buff *skb)
3397 {
3398         switch (skb->protocol) {
3399         case htons(ETH_P_IP):
3400                 return sizeof(struct iphdr);
3401         case htons(ETH_P_IPV6):
3402                 return sizeof(struct ipv6hdr);
3403         default:
3404                 return ~0U;
3405         }
3406 }
3407
3408 #define BPF_F_ADJ_ROOM_ENCAP_L3_MASK    (BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 | \
3409                                          BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3410
3411 #define BPF_F_ADJ_ROOM_MASK             (BPF_F_ADJ_ROOM_FIXED_GSO | \
3412                                          BPF_F_ADJ_ROOM_ENCAP_L3_MASK | \
3413                                          BPF_F_ADJ_ROOM_ENCAP_L4_GRE | \
3414                                          BPF_F_ADJ_ROOM_ENCAP_L4_UDP | \
3415                                          BPF_F_ADJ_ROOM_ENCAP_L2( \
3416                                           BPF_ADJ_ROOM_ENCAP_L2_MASK))
3417
3418 static int bpf_skb_net_grow(struct sk_buff *skb, u32 off, u32 len_diff,
3419                             u64 flags)
3420 {
3421         u8 inner_mac_len = flags >> BPF_ADJ_ROOM_ENCAP_L2_SHIFT;
3422         bool encap = flags & BPF_F_ADJ_ROOM_ENCAP_L3_MASK;
3423         u16 mac_len = 0, inner_net = 0, inner_trans = 0;
3424         unsigned int gso_type = SKB_GSO_DODGY;
3425         int ret;
3426
3427         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3428                 /* udp gso_size delineates datagrams, only allow if fixed */
3429                 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3430                     !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3431                         return -ENOTSUPP;
3432         }
3433
3434         ret = skb_cow_head(skb, len_diff);
3435         if (unlikely(ret < 0))
3436                 return ret;
3437
3438         if (encap) {
3439                 if (skb->protocol != htons(ETH_P_IP) &&
3440                     skb->protocol != htons(ETH_P_IPV6))
3441                         return -ENOTSUPP;
3442
3443                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4 &&
3444                     flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3445                         return -EINVAL;
3446
3447                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE &&
3448                     flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3449                         return -EINVAL;
3450
3451                 if (skb->encapsulation)
3452                         return -EALREADY;
3453
3454                 mac_len = skb->network_header - skb->mac_header;
3455                 inner_net = skb->network_header;
3456                 if (inner_mac_len > len_diff)
3457                         return -EINVAL;
3458                 inner_trans = skb->transport_header;
3459         }
3460
3461         ret = bpf_skb_net_hdr_push(skb, off, len_diff);
3462         if (unlikely(ret < 0))
3463                 return ret;
3464
3465         if (encap) {
3466                 skb->inner_mac_header = inner_net - inner_mac_len;
3467                 skb->inner_network_header = inner_net;
3468                 skb->inner_transport_header = inner_trans;
3469                 skb_set_inner_protocol(skb, skb->protocol);
3470
3471                 skb->encapsulation = 1;
3472                 skb_set_network_header(skb, mac_len);
3473
3474                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP)
3475                         gso_type |= SKB_GSO_UDP_TUNNEL;
3476                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE)
3477                         gso_type |= SKB_GSO_GRE;
3478                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3479                         gso_type |= SKB_GSO_IPXIP6;
3480                 else if (flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3481                         gso_type |= SKB_GSO_IPXIP4;
3482
3483                 if (flags & BPF_F_ADJ_ROOM_ENCAP_L4_GRE ||
3484                     flags & BPF_F_ADJ_ROOM_ENCAP_L4_UDP) {
3485                         int nh_len = flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6 ?
3486                                         sizeof(struct ipv6hdr) :
3487                                         sizeof(struct iphdr);
3488
3489                         skb_set_transport_header(skb, mac_len + nh_len);
3490                 }
3491
3492                 /* Match skb->protocol to new outer l3 protocol */
3493                 if (skb->protocol == htons(ETH_P_IP) &&
3494                     flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV6)
3495                         skb->protocol = htons(ETH_P_IPV6);
3496                 else if (skb->protocol == htons(ETH_P_IPV6) &&
3497                          flags & BPF_F_ADJ_ROOM_ENCAP_L3_IPV4)
3498                         skb->protocol = htons(ETH_P_IP);
3499         }
3500
3501         if (skb_is_gso(skb)) {
3502                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3503
3504                 /* Due to header grow, MSS needs to be downgraded. */
3505                 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3506                         skb_decrease_gso_size(shinfo, len_diff);
3507
3508                 /* Header must be checked, and gso_segs recomputed. */
3509                 shinfo->gso_type |= gso_type;
3510                 shinfo->gso_segs = 0;
3511         }
3512
3513         return 0;
3514 }
3515
3516 static int bpf_skb_net_shrink(struct sk_buff *skb, u32 off, u32 len_diff,
3517                               u64 flags)
3518 {
3519         int ret;
3520
3521         if (unlikely(flags & ~(BPF_F_ADJ_ROOM_FIXED_GSO |
3522                                BPF_F_ADJ_ROOM_NO_CSUM_RESET)))
3523                 return -EINVAL;
3524
3525         if (skb_is_gso(skb) && !skb_is_gso_tcp(skb)) {
3526                 /* udp gso_size delineates datagrams, only allow if fixed */
3527                 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) ||
3528                     !(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3529                         return -ENOTSUPP;
3530         }
3531
3532         ret = skb_unclone(skb, GFP_ATOMIC);
3533         if (unlikely(ret < 0))
3534                 return ret;
3535
3536         ret = bpf_skb_net_hdr_pop(skb, off, len_diff);
3537         if (unlikely(ret < 0))
3538                 return ret;
3539
3540         if (skb_is_gso(skb)) {
3541                 struct skb_shared_info *shinfo = skb_shinfo(skb);
3542
3543                 /* Due to header shrink, MSS can be upgraded. */
3544                 if (!(flags & BPF_F_ADJ_ROOM_FIXED_GSO))
3545                         skb_increase_gso_size(shinfo, len_diff);
3546
3547                 /* Header must be checked, and gso_segs recomputed. */
3548                 shinfo->gso_type |= SKB_GSO_DODGY;
3549                 shinfo->gso_segs = 0;
3550         }
3551
3552         return 0;
3553 }
3554
3555 static u32 __bpf_skb_max_len(const struct sk_buff *skb)
3556 {
3557         return skb->dev ? skb->dev->mtu + skb->dev->hard_header_len :
3558                           SKB_MAX_ALLOC;
3559 }
3560
3561 BPF_CALL_4(sk_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
3562            u32, mode, u64, flags)
3563 {
3564         u32 len_diff_abs = abs(len_diff);
3565         bool shrink = len_diff < 0;
3566         int ret = 0;
3567
3568         if (unlikely(flags || mode))
3569                 return -EINVAL;
3570         if (unlikely(len_diff_abs > 0xfffU))
3571                 return -EFAULT;
3572
3573         if (!shrink) {
3574                 ret = skb_cow(skb, len_diff);
3575                 if (unlikely(ret < 0))
3576                         return ret;
3577                 __skb_push(skb, len_diff_abs);
3578                 memset(skb->data, 0, len_diff_abs);
3579         } else {
3580                 if (unlikely(!pskb_may_pull(skb, len_diff_abs)))
3581                         return -ENOMEM;
3582                 __skb_pull(skb, len_diff_abs);
3583         }
3584         bpf_compute_data_end_sk_skb(skb);
3585         if (tls_sw_has_ctx_rx(skb->sk)) {
3586                 struct strp_msg *rxm = strp_msg(skb);
3587
3588                 rxm->full_len += len_diff;
3589         }
3590         return ret;
3591 }
3592
3593 static const struct bpf_func_proto sk_skb_adjust_room_proto = {
3594         .func           = sk_skb_adjust_room,
3595         .gpl_only       = false,
3596         .ret_type       = RET_INTEGER,
3597         .arg1_type      = ARG_PTR_TO_CTX,
3598         .arg2_type      = ARG_ANYTHING,
3599         .arg3_type      = ARG_ANYTHING,
3600         .arg4_type      = ARG_ANYTHING,
3601 };
3602
3603 BPF_CALL_4(bpf_skb_adjust_room, struct sk_buff *, skb, s32, len_diff,
3604            u32, mode, u64, flags)
3605 {
3606         u32 len_cur, len_diff_abs = abs(len_diff);
3607         u32 len_min = bpf_skb_net_base_len(skb);
3608         u32 len_max = __bpf_skb_max_len(skb);
3609         __be16 proto = skb->protocol;
3610         bool shrink = len_diff < 0;
3611         u32 off;
3612         int ret;
3613
3614         if (unlikely(flags & ~(BPF_F_ADJ_ROOM_MASK |
3615                                BPF_F_ADJ_ROOM_NO_CSUM_RESET)))
3616                 return -EINVAL;
3617         if (unlikely(len_diff_abs > 0xfffU))
3618                 return -EFAULT;
3619         if (unlikely(proto != htons(ETH_P_IP) &&
3620                      proto != htons(ETH_P_IPV6)))
3621                 return -ENOTSUPP;
3622
3623         off = skb_mac_header_len(skb);
3624         switch (mode) {
3625         case BPF_ADJ_ROOM_NET:
3626                 off += bpf_skb_net_base_len(skb);
3627                 break;
3628         case BPF_ADJ_ROOM_MAC:
3629                 break;
3630         default:
3631                 return -ENOTSUPP;
3632         }
3633
3634         len_cur = skb->len - skb_network_offset(skb);
3635         if ((shrink && (len_diff_abs >= len_cur ||
3636                         len_cur - len_diff_abs < len_min)) ||
3637             (!shrink && (skb->len + len_diff_abs > len_max &&
3638                          !skb_is_gso(skb))))
3639                 return -ENOTSUPP;
3640
3641         ret = shrink ? bpf_skb_net_shrink(skb, off, len_diff_abs, flags) :
3642                        bpf_skb_net_grow(skb, off, len_diff_abs, flags);
3643         if (!ret && !(flags & BPF_F_ADJ_ROOM_NO_CSUM_RESET))
3644                 __skb_reset_checksum_unnecessary(skb);
3645
3646         bpf_compute_data_pointers(skb);
3647         return ret;
3648 }
3649
3650 static const struct bpf_func_proto bpf_skb_adjust_room_proto = {
3651         .func           = bpf_skb_adjust_room,
3652         .gpl_only       = false,
3653         .ret_type       = RET_INTEGER,
3654         .arg1_type      = ARG_PTR_TO_CTX,
3655         .arg2_type      = ARG_ANYTHING,
3656         .arg3_type      = ARG_ANYTHING,
3657         .arg4_type      = ARG_ANYTHING,
3658 };
3659
3660 static u32 __bpf_skb_min_len(const struct sk_buff *skb)
3661 {
3662         u32 min_len = skb_network_offset(skb);
3663
3664         if (skb_transport_header_was_set(skb))
3665                 min_len = skb_transport_offset(skb);
3666         if (skb->ip_summed == CHECKSUM_PARTIAL)
3667                 min_len = skb_checksum_start_offset(skb) +
3668                           skb->csum_offset + sizeof(__sum16);
3669         return min_len;
3670 }
3671
3672 static int bpf_skb_grow_rcsum(struct sk_buff *skb, unsigned int new_len)
3673 {
3674         unsigned int old_len = skb->len;
3675         int ret;
3676
3677         ret = __skb_grow_rcsum(skb, new_len);
3678         if (!ret)
3679                 memset(skb->data + old_len, 0, new_len - old_len);
3680         return ret;
3681 }
3682
3683 static int bpf_skb_trim_rcsum(struct sk_buff *skb, unsigned int new_len)
3684 {
3685         return __skb_trim_rcsum(skb, new_len);
3686 }
3687
3688 static inline int __bpf_skb_change_tail(struct sk_buff *skb, u32 new_len,
3689                                         u64 flags)
3690 {
3691         u32 max_len = __bpf_skb_max_len(skb);
3692         u32 min_len = __bpf_skb_min_len(skb);
3693         int ret;
3694
3695         if (unlikely(flags || new_len > max_len || new_len < min_len))
3696                 return -EINVAL;
3697         if (skb->encapsulation)
3698                 return -ENOTSUPP;
3699
3700         /* The basic idea of this helper is that it's performing the
3701          * needed work to either grow or trim an skb, and eBPF program
3702          * rewrites the rest via helpers like bpf_skb_store_bytes(),
3703          * bpf_lX_csum_replace() and others rather than passing a raw
3704          * buffer here. This one is a slow path helper and intended
3705          * for replies with control messages.
3706          *
3707          * Like in bpf_skb_change_proto(), we want to keep this rather
3708          * minimal and without protocol specifics so that we are able
3709          * to separate concerns as in bpf_skb_store_bytes() should only
3710          * be the one responsible for writing buffers.
3711          *
3712          * It's really expected to be a slow path operation here for
3713          * control message replies, so we're implicitly linearizing,
3714          * uncloning and drop offloads from the skb by this.
3715          */
3716         ret = __bpf_try_make_writable(skb, skb->len);
3717         if (!ret) {
3718                 if (new_len > skb->len)
3719                         ret = bpf_skb_grow_rcsum(skb, new_len);
3720                 else if (new_len < skb->len)
3721                         ret = bpf_skb_trim_rcsum(skb, new_len);
3722                 if (!ret && skb_is_gso(skb))
3723                         skb_gso_reset(skb);
3724         }
3725         return ret;
3726 }
3727
3728 BPF_CALL_3(bpf_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3729            u64, flags)
3730 {
3731         int ret = __bpf_skb_change_tail(skb, new_len, flags);
3732
3733         bpf_compute_data_pointers(skb);
3734         return ret;
3735 }
3736
3737 static const struct bpf_func_proto bpf_skb_change_tail_proto = {
3738         .func           = bpf_skb_change_tail,
3739         .gpl_only       = false,
3740         .ret_type       = RET_INTEGER,
3741         .arg1_type      = ARG_PTR_TO_CTX,
3742         .arg2_type      = ARG_ANYTHING,
3743         .arg3_type      = ARG_ANYTHING,
3744 };
3745
3746 BPF_CALL_3(sk_skb_change_tail, struct sk_buff *, skb, u32, new_len,
3747            u64, flags)
3748 {
3749         int ret = __bpf_skb_change_tail(skb, new_len, flags);
3750
3751         bpf_compute_data_end_sk_skb(skb);
3752         return ret;
3753 }
3754
3755 static const struct bpf_func_proto sk_skb_change_tail_proto = {
3756         .func           = sk_skb_change_tail,
3757         .gpl_only       = false,
3758         .ret_type       = RET_INTEGER,
3759         .arg1_type      = ARG_PTR_TO_CTX,
3760         .arg2_type      = ARG_ANYTHING,
3761         .arg3_type      = ARG_ANYTHING,
3762 };
3763
3764 static inline int __bpf_skb_change_head(struct sk_buff *skb, u32 head_room,
3765                                         u64 flags)
3766 {
3767         u32 max_len = __bpf_skb_max_len(skb);
3768         u32 new_len = skb->len + head_room;
3769         int ret;
3770
3771         if (unlikely(flags || (!skb_is_gso(skb) && new_len > max_len) ||
3772                      new_len < skb->len))
3773                 return -EINVAL;
3774
3775         ret = skb_cow(skb, head_room);
3776         if (likely(!ret)) {
3777                 /* Idea for this helper is that we currently only
3778                  * allow to expand on mac header. This means that
3779                  * skb->protocol network header, etc, stay as is.
3780                  * Compared to bpf_skb_change_tail(), we're more
3781                  * flexible due to not needing to linearize or
3782                  * reset GSO. Intention for this helper is to be
3783                  * used by an L3 skb that needs to push mac header
3784                  * for redirection into L2 device.
3785                  */
3786                 __skb_push(skb, head_room);
3787                 memset(skb->data, 0, head_room);
3788                 skb_reset_mac_header(skb);
3789         }
3790
3791         return ret;
3792 }
3793
3794 BPF_CALL_3(bpf_skb_change_head, struct sk_buff *, skb, u32, head_room,
3795            u64, flags)
3796 {
3797         int ret = __bpf_skb_change_head(skb, head_room, flags);
3798
3799         bpf_compute_data_pointers(skb);
3800         return ret;
3801 }
3802
3803 static const struct bpf_func_proto bpf_skb_change_head_proto = {
3804         .func           = bpf_skb_change_head,
3805         .gpl_only       = false,
3806         .ret_type       = RET_INTEGER,
3807         .arg1_type      = ARG_PTR_TO_CTX,
3808         .arg2_type      = ARG_ANYTHING,
3809         .arg3_type      = ARG_ANYTHING,
3810 };
3811
3812 BPF_CALL_3(sk_skb_change_head, struct sk_buff *, skb, u32, head_room,
3813            u64, flags)
3814 {
3815         int ret = __bpf_skb_change_head(skb, head_room, flags);
3816
3817         bpf_compute_data_end_sk_skb(skb);
3818         return ret;
3819 }
3820
3821 static const struct bpf_func_proto sk_skb_change_head_proto = {
3822         .func           = sk_skb_change_head,
3823         .gpl_only       = false,
3824         .ret_type       = RET_INTEGER,
3825         .arg1_type      = ARG_PTR_TO_CTX,
3826         .arg2_type      = ARG_ANYTHING,
3827         .arg3_type      = ARG_ANYTHING,
3828 };
3829 static unsigned long xdp_get_metalen(const struct xdp_buff *xdp)
3830 {
3831         return xdp_data_meta_unsupported(xdp) ? 0 :
3832                xdp->data - xdp->data_meta;
3833 }
3834
3835 BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
3836 {
3837         void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3838         unsigned long metalen = xdp_get_metalen(xdp);
3839         void *data_start = xdp_frame_end + metalen;
3840         void *data = xdp->data + offset;
3841
3842         if (unlikely(data < data_start ||
3843                      data > xdp->data_end - ETH_HLEN))
3844                 return -EINVAL;
3845
3846         if (metalen)
3847                 memmove(xdp->data_meta + offset,
3848                         xdp->data_meta, metalen);
3849         xdp->data_meta += offset;
3850         xdp->data = data;
3851
3852         return 0;
3853 }
3854
3855 static const struct bpf_func_proto bpf_xdp_adjust_head_proto = {
3856         .func           = bpf_xdp_adjust_head,
3857         .gpl_only       = false,
3858         .ret_type       = RET_INTEGER,
3859         .arg1_type      = ARG_PTR_TO_CTX,
3860         .arg2_type      = ARG_ANYTHING,
3861 };
3862
3863 BPF_CALL_2(bpf_xdp_adjust_tail, struct xdp_buff *, xdp, int, offset)
3864 {
3865         void *data_hard_end = xdp_data_hard_end(xdp); /* use xdp->frame_sz */
3866         void *data_end = xdp->data_end + offset;
3867
3868         /* Notice that xdp_data_hard_end have reserved some tailroom */
3869         if (unlikely(data_end > data_hard_end))
3870                 return -EINVAL;
3871
3872         /* ALL drivers MUST init xdp->frame_sz, chicken check below */
3873         if (unlikely(xdp->frame_sz > PAGE_SIZE)) {
3874                 WARN_ONCE(1, "Too BIG xdp->frame_sz = %d\n", xdp->frame_sz);
3875                 return -EINVAL;
3876         }
3877
3878         if (unlikely(data_end < xdp->data + ETH_HLEN))
3879                 return -EINVAL;
3880
3881         /* Clear memory area on grow, can contain uninit kernel memory */
3882         if (offset > 0)
3883                 memset(xdp->data_end, 0, offset);
3884
3885         xdp->data_end = data_end;
3886
3887         return 0;
3888 }
3889
3890 static const struct bpf_func_proto bpf_xdp_adjust_tail_proto = {
3891         .func           = bpf_xdp_adjust_tail,
3892         .gpl_only       = false,
3893         .ret_type       = RET_INTEGER,
3894         .arg1_type      = ARG_PTR_TO_CTX,
3895         .arg2_type      = ARG_ANYTHING,
3896 };
3897
3898 BPF_CALL_2(bpf_xdp_adjust_meta, struct xdp_buff *, xdp, int, offset)
3899 {
3900         void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
3901         void *meta = xdp->data_meta + offset;
3902         unsigned long metalen = xdp->data - meta;
3903
3904         if (xdp_data_meta_unsupported(xdp))
3905                 return -ENOTSUPP;
3906         if (unlikely(meta < xdp_frame_end ||
3907                      meta > xdp->data))
3908                 return -EINVAL;
3909         if (unlikely((metalen & (sizeof(__u32) - 1)) ||
3910                      (metalen > 32)))
3911                 return -EACCES;
3912
3913         xdp->data_meta = meta;
3914
3915         return 0;
3916 }
3917
3918 static const struct bpf_func_proto bpf_xdp_adjust_meta_proto = {
3919         .func           = bpf_xdp_adjust_meta,
3920         .gpl_only       = false,
3921         .ret_type       = RET_INTEGER,
3922         .arg1_type      = ARG_PTR_TO_CTX,
3923         .arg2_type      = ARG_ANYTHING,
3924 };
3925
3926 static int __bpf_tx_xdp_map(struct net_device *dev_rx, void *fwd,
3927                             struct bpf_map *map, struct xdp_buff *xdp)
3928 {
3929         switch (map->map_type) {
3930         case BPF_MAP_TYPE_DEVMAP:
3931         case BPF_MAP_TYPE_DEVMAP_HASH:
3932                 return dev_map_enqueue(fwd, xdp, dev_rx);
3933         case BPF_MAP_TYPE_CPUMAP:
3934                 return cpu_map_enqueue(fwd, xdp, dev_rx);
3935         case BPF_MAP_TYPE_XSKMAP:
3936                 return __xsk_map_redirect(fwd, xdp);
3937         default:
3938                 return -EBADRQC;
3939         }
3940         return 0;
3941 }
3942
3943 void xdp_do_flush(void)
3944 {
3945         __dev_flush();
3946         __cpu_map_flush();
3947         __xsk_map_flush();
3948 }
3949 EXPORT_SYMBOL_GPL(xdp_do_flush);
3950
3951 static inline void *__xdp_map_lookup_elem(struct bpf_map *map, u32 index)
3952 {
3953         switch (map->map_type) {
3954         case BPF_MAP_TYPE_DEVMAP:
3955                 return __dev_map_lookup_elem(map, index);
3956         case BPF_MAP_TYPE_DEVMAP_HASH:
3957                 return __dev_map_hash_lookup_elem(map, index);
3958         case BPF_MAP_TYPE_CPUMAP:
3959                 return __cpu_map_lookup_elem(map, index);
3960         case BPF_MAP_TYPE_XSKMAP:
3961                 return __xsk_map_lookup_elem(map, index);
3962         default:
3963                 return NULL;
3964         }
3965 }
3966
3967 void bpf_clear_redirect_map(struct bpf_map *map)
3968 {
3969         struct bpf_redirect_info *ri;
3970         int cpu;
3971
3972         for_each_possible_cpu(cpu) {
3973                 ri = per_cpu_ptr(&bpf_redirect_info, cpu);
3974                 /* Avoid polluting remote cacheline due to writes if
3975                  * not needed. Once we pass this test, we need the
3976                  * cmpxchg() to make sure it hasn't been changed in
3977                  * the meantime by remote CPU.
3978                  */
3979                 if (unlikely(READ_ONCE(ri->map) == map))
3980                         cmpxchg(&ri->map, map, NULL);
3981         }
3982 }
3983
3984 int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp,
3985                     struct bpf_prog *xdp_prog)
3986 {
3987         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
3988         struct bpf_map *map = READ_ONCE(ri->map);
3989         u32 index = ri->tgt_index;
3990         void *fwd = ri->tgt_value;
3991         int err;
3992
3993         ri->tgt_index = 0;
3994         ri->tgt_value = NULL;
3995         WRITE_ONCE(ri->map, NULL);
3996
3997         if (unlikely(!map)) {
3998                 fwd = dev_get_by_index_rcu(dev_net(dev), index);
3999                 if (unlikely(!fwd)) {
4000                         err = -EINVAL;
4001                         goto err;
4002                 }
4003
4004                 err = dev_xdp_enqueue(fwd, xdp, dev);
4005         } else {
4006                 err = __bpf_tx_xdp_map(dev, fwd, map, xdp);
4007         }
4008
4009         if (unlikely(err))
4010                 goto err;
4011
4012         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
4013         return 0;
4014 err:
4015         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
4016         return err;
4017 }
4018 EXPORT_SYMBOL_GPL(xdp_do_redirect);
4019
4020 static int xdp_do_generic_redirect_map(struct net_device *dev,
4021                                        struct sk_buff *skb,
4022                                        struct xdp_buff *xdp,
4023                                        struct bpf_prog *xdp_prog,
4024                                        struct bpf_map *map)
4025 {
4026         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4027         u32 index = ri->tgt_index;
4028         void *fwd = ri->tgt_value;
4029         int err = 0;
4030
4031         ri->tgt_index = 0;
4032         ri->tgt_value = NULL;
4033         WRITE_ONCE(ri->map, NULL);
4034
4035         if (map->map_type == BPF_MAP_TYPE_DEVMAP ||
4036             map->map_type == BPF_MAP_TYPE_DEVMAP_HASH) {
4037                 struct bpf_dtab_netdev *dst = fwd;
4038
4039                 err = dev_map_generic_redirect(dst, skb, xdp_prog);
4040                 if (unlikely(err))
4041                         goto err;
4042         } else if (map->map_type == BPF_MAP_TYPE_XSKMAP) {
4043                 struct xdp_sock *xs = fwd;
4044
4045                 err = xsk_generic_rcv(xs, xdp);
4046                 if (err)
4047                         goto err;
4048                 consume_skb(skb);
4049         } else {
4050                 /* TODO: Handle BPF_MAP_TYPE_CPUMAP */
4051                 err = -EBADRQC;
4052                 goto err;
4053         }
4054
4055         _trace_xdp_redirect_map(dev, xdp_prog, fwd, map, index);
4056         return 0;
4057 err:
4058         _trace_xdp_redirect_map_err(dev, xdp_prog, fwd, map, index, err);
4059         return err;
4060 }
4061
4062 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
4063                             struct xdp_buff *xdp, struct bpf_prog *xdp_prog)
4064 {
4065         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4066         struct bpf_map *map = READ_ONCE(ri->map);
4067         u32 index = ri->tgt_index;
4068         struct net_device *fwd;
4069         int err = 0;
4070
4071         if (map)
4072                 return xdp_do_generic_redirect_map(dev, skb, xdp, xdp_prog,
4073                                                    map);
4074         ri->tgt_index = 0;
4075         fwd = dev_get_by_index_rcu(dev_net(dev), index);
4076         if (unlikely(!fwd)) {
4077                 err = -EINVAL;
4078                 goto err;
4079         }
4080
4081         err = xdp_ok_fwd_dev(fwd, skb->len);
4082         if (unlikely(err))
4083                 goto err;
4084
4085         skb->dev = fwd;
4086         _trace_xdp_redirect(dev, xdp_prog, index);
4087         generic_xdp_tx(skb, xdp_prog);
4088         return 0;
4089 err:
4090         _trace_xdp_redirect_err(dev, xdp_prog, index, err);
4091         return err;
4092 }
4093
4094 BPF_CALL_2(bpf_xdp_redirect, u32, ifindex, u64, flags)
4095 {
4096         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4097
4098         if (unlikely(flags))
4099                 return XDP_ABORTED;
4100
4101         ri->flags = flags;
4102         ri->tgt_index = ifindex;
4103         ri->tgt_value = NULL;
4104         WRITE_ONCE(ri->map, NULL);
4105
4106         return XDP_REDIRECT;
4107 }
4108
4109 static const struct bpf_func_proto bpf_xdp_redirect_proto = {
4110         .func           = bpf_xdp_redirect,
4111         .gpl_only       = false,
4112         .ret_type       = RET_INTEGER,
4113         .arg1_type      = ARG_ANYTHING,
4114         .arg2_type      = ARG_ANYTHING,
4115 };
4116
4117 BPF_CALL_3(bpf_xdp_redirect_map, struct bpf_map *, map, u32, ifindex,
4118            u64, flags)
4119 {
4120         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
4121
4122         /* Lower bits of the flags are used as return code on lookup failure */
4123         if (unlikely(flags > XDP_TX))
4124                 return XDP_ABORTED;
4125
4126         ri->tgt_value = __xdp_map_lookup_elem(map, ifindex);
4127         if (unlikely(!ri->tgt_value)) {
4128                 /* If the lookup fails we want to clear out the state in the
4129                  * redirect_info struct completely, so that if an eBPF program
4130                  * performs multiple lookups, the last one always takes
4131                  * precedence.
4132                  */
4133                 WRITE_ONCE(ri->map, NULL);
4134                 return flags;
4135         }
4136
4137         ri->flags = flags;
4138         ri->tgt_index = ifindex;
4139         WRITE_ONCE(ri->map, map);
4140
4141         return XDP_REDIRECT;
4142 }
4143
4144 static const struct bpf_func_proto bpf_xdp_redirect_map_proto = {
4145         .func           = bpf_xdp_redirect_map,
4146         .gpl_only       = false,
4147         .ret_type       = RET_INTEGER,
4148         .arg1_type      = ARG_CONST_MAP_PTR,
4149         .arg2_type      = ARG_ANYTHING,
4150         .arg3_type      = ARG_ANYTHING,
4151 };
4152
4153 static unsigned long bpf_skb_copy(void *dst_buff, const void *skb,
4154                                   unsigned long off, unsigned long len)
4155 {
4156         void *ptr = skb_header_pointer(skb, off, len, dst_buff);
4157
4158         if (unlikely(!ptr))
4159                 return len;
4160         if (ptr != dst_buff)
4161                 memcpy(dst_buff, ptr, len);
4162
4163         return 0;
4164 }
4165
4166 BPF_CALL_5(bpf_skb_event_output, struct sk_buff *, skb, struct bpf_map *, map,
4167            u64, flags, void *, meta, u64, meta_size)
4168 {
4169         u64 skb_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4170
4171         if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4172                 return -EINVAL;
4173         if (unlikely(!skb || skb_size > skb->len))
4174                 return -EFAULT;
4175
4176         return bpf_event_output(map, flags, meta, meta_size, skb, skb_size,
4177                                 bpf_skb_copy);
4178 }
4179
4180 static const struct bpf_func_proto bpf_skb_event_output_proto = {
4181         .func           = bpf_skb_event_output,
4182         .gpl_only       = true,
4183         .ret_type       = RET_INTEGER,
4184         .arg1_type      = ARG_PTR_TO_CTX,
4185         .arg2_type      = ARG_CONST_MAP_PTR,
4186         .arg3_type      = ARG_ANYTHING,
4187         .arg4_type      = ARG_PTR_TO_MEM,
4188         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4189 };
4190
4191 BTF_ID_LIST_SINGLE(bpf_skb_output_btf_ids, struct, sk_buff)
4192
4193 const struct bpf_func_proto bpf_skb_output_proto = {
4194         .func           = bpf_skb_event_output,
4195         .gpl_only       = true,
4196         .ret_type       = RET_INTEGER,
4197         .arg1_type      = ARG_PTR_TO_BTF_ID,
4198         .arg1_btf_id    = &bpf_skb_output_btf_ids[0],
4199         .arg2_type      = ARG_CONST_MAP_PTR,
4200         .arg3_type      = ARG_ANYTHING,
4201         .arg4_type      = ARG_PTR_TO_MEM,
4202         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4203 };
4204
4205 static unsigned short bpf_tunnel_key_af(u64 flags)
4206 {
4207         return flags & BPF_F_TUNINFO_IPV6 ? AF_INET6 : AF_INET;
4208 }
4209
4210 BPF_CALL_4(bpf_skb_get_tunnel_key, struct sk_buff *, skb, struct bpf_tunnel_key *, to,
4211            u32, size, u64, flags)
4212 {
4213         const struct ip_tunnel_info *info = skb_tunnel_info(skb);
4214         u8 compat[sizeof(struct bpf_tunnel_key)];
4215         void *to_orig = to;
4216         int err;
4217
4218         if (unlikely(!info || (flags & ~(BPF_F_TUNINFO_IPV6)))) {
4219                 err = -EINVAL;
4220                 goto err_clear;
4221         }
4222         if (ip_tunnel_info_af(info) != bpf_tunnel_key_af(flags)) {
4223                 err = -EPROTO;
4224                 goto err_clear;
4225         }
4226         if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
4227                 err = -EINVAL;
4228                 switch (size) {
4229                 case offsetof(struct bpf_tunnel_key, tunnel_label):
4230                 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4231                         goto set_compat;
4232                 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
4233                         /* Fixup deprecated structure layouts here, so we have
4234                          * a common path later on.
4235                          */
4236                         if (ip_tunnel_info_af(info) != AF_INET)
4237                                 goto err_clear;
4238 set_compat:
4239                         to = (struct bpf_tunnel_key *)compat;
4240                         break;
4241                 default:
4242                         goto err_clear;
4243                 }
4244         }
4245
4246         to->tunnel_id = be64_to_cpu(info->key.tun_id);
4247         to->tunnel_tos = info->key.tos;
4248         to->tunnel_ttl = info->key.ttl;
4249         to->tunnel_ext = 0;
4250
4251         if (flags & BPF_F_TUNINFO_IPV6) {
4252                 memcpy(to->remote_ipv6, &info->key.u.ipv6.src,
4253                        sizeof(to->remote_ipv6));
4254                 to->tunnel_label = be32_to_cpu(info->key.label);
4255         } else {
4256                 to->remote_ipv4 = be32_to_cpu(info->key.u.ipv4.src);
4257                 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
4258                 to->tunnel_label = 0;
4259         }
4260
4261         if (unlikely(size != sizeof(struct bpf_tunnel_key)))
4262                 memcpy(to_orig, to, size);
4263
4264         return 0;
4265 err_clear:
4266         memset(to_orig, 0, size);
4267         return err;
4268 }
4269
4270 static const struct bpf_func_proto bpf_skb_get_tunnel_key_proto = {
4271         .func           = bpf_skb_get_tunnel_key,
4272         .gpl_only       = false,
4273         .ret_type       = RET_INTEGER,
4274         .arg1_type      = ARG_PTR_TO_CTX,
4275         .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
4276         .arg3_type      = ARG_CONST_SIZE,
4277         .arg4_type      = ARG_ANYTHING,
4278 };
4279
4280 BPF_CALL_3(bpf_skb_get_tunnel_opt, struct sk_buff *, skb, u8 *, to, u32, size)
4281 {
4282         const struct ip_tunnel_info *info = skb_tunnel_info(skb);
4283         int err;
4284
4285         if (unlikely(!info ||
4286                      !(info->key.tun_flags & TUNNEL_OPTIONS_PRESENT))) {
4287                 err = -ENOENT;
4288                 goto err_clear;
4289         }
4290         if (unlikely(size < info->options_len)) {
4291                 err = -ENOMEM;
4292                 goto err_clear;
4293         }
4294
4295         ip_tunnel_info_opts_get(to, info);
4296         if (size > info->options_len)
4297                 memset(to + info->options_len, 0, size - info->options_len);
4298
4299         return info->options_len;
4300 err_clear:
4301         memset(to, 0, size);
4302         return err;
4303 }
4304
4305 static const struct bpf_func_proto bpf_skb_get_tunnel_opt_proto = {
4306         .func           = bpf_skb_get_tunnel_opt,
4307         .gpl_only       = false,
4308         .ret_type       = RET_INTEGER,
4309         .arg1_type      = ARG_PTR_TO_CTX,
4310         .arg2_type      = ARG_PTR_TO_UNINIT_MEM,
4311         .arg3_type      = ARG_CONST_SIZE,
4312 };
4313
4314 static struct metadata_dst __percpu *md_dst;
4315
4316 BPF_CALL_4(bpf_skb_set_tunnel_key, struct sk_buff *, skb,
4317            const struct bpf_tunnel_key *, from, u32, size, u64, flags)
4318 {
4319         struct metadata_dst *md = this_cpu_ptr(md_dst);
4320         u8 compat[sizeof(struct bpf_tunnel_key)];
4321         struct ip_tunnel_info *info;
4322
4323         if (unlikely(flags & ~(BPF_F_TUNINFO_IPV6 | BPF_F_ZERO_CSUM_TX |
4324                                BPF_F_DONT_FRAGMENT | BPF_F_SEQ_NUMBER)))
4325                 return -EINVAL;
4326         if (unlikely(size != sizeof(struct bpf_tunnel_key))) {
4327                 switch (size) {
4328                 case offsetof(struct bpf_tunnel_key, tunnel_label):
4329                 case offsetof(struct bpf_tunnel_key, tunnel_ext):
4330                 case offsetof(struct bpf_tunnel_key, remote_ipv6[1]):
4331                         /* Fixup deprecated structure layouts here, so we have
4332                          * a common path later on.
4333                          */
4334                         memcpy(compat, from, size);
4335                         memset(compat + size, 0, sizeof(compat) - size);
4336                         from = (const struct bpf_tunnel_key *) compat;
4337                         break;
4338                 default:
4339                         return -EINVAL;
4340                 }
4341         }
4342         if (unlikely((!(flags & BPF_F_TUNINFO_IPV6) && from->tunnel_label) ||
4343                      from->tunnel_ext))
4344                 return -EINVAL;
4345
4346         skb_dst_drop(skb);
4347         dst_hold((struct dst_entry *) md);
4348         skb_dst_set(skb, (struct dst_entry *) md);
4349
4350         info = &md->u.tun_info;
4351         memset(info, 0, sizeof(*info));
4352         info->mode = IP_TUNNEL_INFO_TX;
4353
4354         info->key.tun_flags = TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_NOCACHE;
4355         if (flags & BPF_F_DONT_FRAGMENT)
4356                 info->key.tun_flags |= TUNNEL_DONT_FRAGMENT;
4357         if (flags & BPF_F_ZERO_CSUM_TX)
4358                 info->key.tun_flags &= ~TUNNEL_CSUM;
4359         if (flags & BPF_F_SEQ_NUMBER)
4360                 info->key.tun_flags |= TUNNEL_SEQ;
4361
4362         info->key.tun_id = cpu_to_be64(from->tunnel_id);
4363         info->key.tos = from->tunnel_tos;
4364         info->key.ttl = from->tunnel_ttl;
4365
4366         if (flags & BPF_F_TUNINFO_IPV6) {
4367                 info->mode |= IP_TUNNEL_INFO_IPV6;
4368                 memcpy(&info->key.u.ipv6.dst, from->remote_ipv6,
4369                        sizeof(from->remote_ipv6));
4370                 info->key.label = cpu_to_be32(from->tunnel_label) &
4371                                   IPV6_FLOWLABEL_MASK;
4372         } else {
4373                 info->key.u.ipv4.dst = cpu_to_be32(from->remote_ipv4);
4374         }
4375
4376         return 0;
4377 }
4378
4379 static const struct bpf_func_proto bpf_skb_set_tunnel_key_proto = {
4380         .func           = bpf_skb_set_tunnel_key,
4381         .gpl_only       = false,
4382         .ret_type       = RET_INTEGER,
4383         .arg1_type      = ARG_PTR_TO_CTX,
4384         .arg2_type      = ARG_PTR_TO_MEM,
4385         .arg3_type      = ARG_CONST_SIZE,
4386         .arg4_type      = ARG_ANYTHING,
4387 };
4388
4389 BPF_CALL_3(bpf_skb_set_tunnel_opt, struct sk_buff *, skb,
4390            const u8 *, from, u32, size)
4391 {
4392         struct ip_tunnel_info *info = skb_tunnel_info(skb);
4393         const struct metadata_dst *md = this_cpu_ptr(md_dst);
4394
4395         if (unlikely(info != &md->u.tun_info || (size & (sizeof(u32) - 1))))
4396                 return -EINVAL;
4397         if (unlikely(size > IP_TUNNEL_OPTS_MAX))
4398                 return -ENOMEM;
4399
4400         ip_tunnel_info_opts_set(info, from, size, TUNNEL_OPTIONS_PRESENT);
4401
4402         return 0;
4403 }
4404
4405 static const struct bpf_func_proto bpf_skb_set_tunnel_opt_proto = {
4406         .func           = bpf_skb_set_tunnel_opt,
4407         .gpl_only       = false,
4408         .ret_type       = RET_INTEGER,
4409         .arg1_type      = ARG_PTR_TO_CTX,
4410         .arg2_type      = ARG_PTR_TO_MEM,
4411         .arg3_type      = ARG_CONST_SIZE,
4412 };
4413
4414 static const struct bpf_func_proto *
4415 bpf_get_skb_set_tunnel_proto(enum bpf_func_id which)
4416 {
4417         if (!md_dst) {
4418                 struct metadata_dst __percpu *tmp;
4419
4420                 tmp = metadata_dst_alloc_percpu(IP_TUNNEL_OPTS_MAX,
4421                                                 METADATA_IP_TUNNEL,
4422                                                 GFP_KERNEL);
4423                 if (!tmp)
4424                         return NULL;
4425                 if (cmpxchg(&md_dst, NULL, tmp))
4426                         metadata_dst_free_percpu(tmp);
4427         }
4428
4429         switch (which) {
4430         case BPF_FUNC_skb_set_tunnel_key:
4431                 return &bpf_skb_set_tunnel_key_proto;
4432         case BPF_FUNC_skb_set_tunnel_opt:
4433                 return &bpf_skb_set_tunnel_opt_proto;
4434         default:
4435                 return NULL;
4436         }
4437 }
4438
4439 BPF_CALL_3(bpf_skb_under_cgroup, struct sk_buff *, skb, struct bpf_map *, map,
4440            u32, idx)
4441 {
4442         struct bpf_array *array = container_of(map, struct bpf_array, map);
4443         struct cgroup *cgrp;
4444         struct sock *sk;
4445
4446         sk = skb_to_full_sk(skb);
4447         if (!sk || !sk_fullsock(sk))
4448                 return -ENOENT;
4449         if (unlikely(idx >= array->map.max_entries))
4450                 return -E2BIG;
4451
4452         cgrp = READ_ONCE(array->ptrs[idx]);
4453         if (unlikely(!cgrp))
4454                 return -EAGAIN;
4455
4456         return sk_under_cgroup_hierarchy(sk, cgrp);
4457 }
4458
4459 static const struct bpf_func_proto bpf_skb_under_cgroup_proto = {
4460         .func           = bpf_skb_under_cgroup,
4461         .gpl_only       = false,
4462         .ret_type       = RET_INTEGER,
4463         .arg1_type      = ARG_PTR_TO_CTX,
4464         .arg2_type      = ARG_CONST_MAP_PTR,
4465         .arg3_type      = ARG_ANYTHING,
4466 };
4467
4468 #ifdef CONFIG_SOCK_CGROUP_DATA
4469 static inline u64 __bpf_sk_cgroup_id(struct sock *sk)
4470 {
4471         struct cgroup *cgrp;
4472
4473         sk = sk_to_full_sk(sk);
4474         if (!sk || !sk_fullsock(sk))
4475                 return 0;
4476
4477         cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4478         return cgroup_id(cgrp);
4479 }
4480
4481 BPF_CALL_1(bpf_skb_cgroup_id, const struct sk_buff *, skb)
4482 {
4483         return __bpf_sk_cgroup_id(skb->sk);
4484 }
4485
4486 static const struct bpf_func_proto bpf_skb_cgroup_id_proto = {
4487         .func           = bpf_skb_cgroup_id,
4488         .gpl_only       = false,
4489         .ret_type       = RET_INTEGER,
4490         .arg1_type      = ARG_PTR_TO_CTX,
4491 };
4492
4493 static inline u64 __bpf_sk_ancestor_cgroup_id(struct sock *sk,
4494                                               int ancestor_level)
4495 {
4496         struct cgroup *ancestor;
4497         struct cgroup *cgrp;
4498
4499         sk = sk_to_full_sk(sk);
4500         if (!sk || !sk_fullsock(sk))
4501                 return 0;
4502
4503         cgrp = sock_cgroup_ptr(&sk->sk_cgrp_data);
4504         ancestor = cgroup_ancestor(cgrp, ancestor_level);
4505         if (!ancestor)
4506                 return 0;
4507
4508         return cgroup_id(ancestor);
4509 }
4510
4511 BPF_CALL_2(bpf_skb_ancestor_cgroup_id, const struct sk_buff *, skb, int,
4512            ancestor_level)
4513 {
4514         return __bpf_sk_ancestor_cgroup_id(skb->sk, ancestor_level);
4515 }
4516
4517 static const struct bpf_func_proto bpf_skb_ancestor_cgroup_id_proto = {
4518         .func           = bpf_skb_ancestor_cgroup_id,
4519         .gpl_only       = false,
4520         .ret_type       = RET_INTEGER,
4521         .arg1_type      = ARG_PTR_TO_CTX,
4522         .arg2_type      = ARG_ANYTHING,
4523 };
4524
4525 BPF_CALL_1(bpf_sk_cgroup_id, struct sock *, sk)
4526 {
4527         return __bpf_sk_cgroup_id(sk);
4528 }
4529
4530 static const struct bpf_func_proto bpf_sk_cgroup_id_proto = {
4531         .func           = bpf_sk_cgroup_id,
4532         .gpl_only       = false,
4533         .ret_type       = RET_INTEGER,
4534         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4535 };
4536
4537 BPF_CALL_2(bpf_sk_ancestor_cgroup_id, struct sock *, sk, int, ancestor_level)
4538 {
4539         return __bpf_sk_ancestor_cgroup_id(sk, ancestor_level);
4540 }
4541
4542 static const struct bpf_func_proto bpf_sk_ancestor_cgroup_id_proto = {
4543         .func           = bpf_sk_ancestor_cgroup_id,
4544         .gpl_only       = false,
4545         .ret_type       = RET_INTEGER,
4546         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
4547         .arg2_type      = ARG_ANYTHING,
4548 };
4549 #endif
4550
4551 static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
4552                                   unsigned long off, unsigned long len)
4553 {
4554         memcpy(dst_buff, src_buff + off, len);
4555         return 0;
4556 }
4557
4558 BPF_CALL_5(bpf_xdp_event_output, struct xdp_buff *, xdp, struct bpf_map *, map,
4559            u64, flags, void *, meta, u64, meta_size)
4560 {
4561         u64 xdp_size = (flags & BPF_F_CTXLEN_MASK) >> 32;
4562
4563         if (unlikely(flags & ~(BPF_F_CTXLEN_MASK | BPF_F_INDEX_MASK)))
4564                 return -EINVAL;
4565         if (unlikely(!xdp ||
4566                      xdp_size > (unsigned long)(xdp->data_end - xdp->data)))
4567                 return -EFAULT;
4568
4569         return bpf_event_output(map, flags, meta, meta_size, xdp->data,
4570                                 xdp_size, bpf_xdp_copy);
4571 }
4572
4573 static const struct bpf_func_proto bpf_xdp_event_output_proto = {
4574         .func           = bpf_xdp_event_output,
4575         .gpl_only       = true,
4576         .ret_type       = RET_INTEGER,
4577         .arg1_type      = ARG_PTR_TO_CTX,
4578         .arg2_type      = ARG_CONST_MAP_PTR,
4579         .arg3_type      = ARG_ANYTHING,
4580         .arg4_type      = ARG_PTR_TO_MEM,
4581         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4582 };
4583
4584 BTF_ID_LIST_SINGLE(bpf_xdp_output_btf_ids, struct, xdp_buff)
4585
4586 const struct bpf_func_proto bpf_xdp_output_proto = {
4587         .func           = bpf_xdp_event_output,
4588         .gpl_only       = true,
4589         .ret_type       = RET_INTEGER,
4590         .arg1_type      = ARG_PTR_TO_BTF_ID,
4591         .arg1_btf_id    = &bpf_xdp_output_btf_ids[0],
4592         .arg2_type      = ARG_CONST_MAP_PTR,
4593         .arg3_type      = ARG_ANYTHING,
4594         .arg4_type      = ARG_PTR_TO_MEM,
4595         .arg5_type      = ARG_CONST_SIZE_OR_ZERO,
4596 };
4597
4598 BPF_CALL_1(bpf_get_socket_cookie, struct sk_buff *, skb)
4599 {
4600         return skb->sk ? __sock_gen_cookie(skb->sk) : 0;
4601 }
4602
4603 static const struct bpf_func_proto bpf_get_socket_cookie_proto = {
4604         .func           = bpf_get_socket_cookie,
4605         .gpl_only       = false,
4606         .ret_type       = RET_INTEGER,
4607         .arg1_type      = ARG_PTR_TO_CTX,
4608 };
4609
4610 BPF_CALL_1(bpf_get_socket_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4611 {
4612         return __sock_gen_cookie(ctx->sk);
4613 }
4614
4615 static const struct bpf_func_proto bpf_get_socket_cookie_sock_addr_proto = {
4616         .func           = bpf_get_socket_cookie_sock_addr,
4617         .gpl_only       = false,
4618         .ret_type       = RET_INTEGER,
4619         .arg1_type      = ARG_PTR_TO_CTX,
4620 };
4621
4622 BPF_CALL_1(bpf_get_socket_cookie_sock, struct sock *, ctx)
4623 {
4624         return __sock_gen_cookie(ctx);
4625 }
4626
4627 static const struct bpf_func_proto bpf_get_socket_cookie_sock_proto = {
4628         .func           = bpf_get_socket_cookie_sock,
4629         .gpl_only       = false,
4630         .ret_type       = RET_INTEGER,
4631         .arg1_type      = ARG_PTR_TO_CTX,
4632 };
4633
4634 BPF_CALL_1(bpf_get_socket_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
4635 {
4636         return __sock_gen_cookie(ctx->sk);
4637 }
4638
4639 static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
4640         .func           = bpf_get_socket_cookie_sock_ops,
4641         .gpl_only       = false,
4642         .ret_type       = RET_INTEGER,
4643         .arg1_type      = ARG_PTR_TO_CTX,
4644 };
4645
4646 static u64 __bpf_get_netns_cookie(struct sock *sk)
4647 {
4648 #ifdef CONFIG_NET_NS
4649         return __net_gen_cookie(sk ? sk->sk_net.net : &init_net);
4650 #else
4651         return 0;
4652 #endif
4653 }
4654
4655 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx)
4656 {
4657         return __bpf_get_netns_cookie(ctx);
4658 }
4659
4660 static const struct bpf_func_proto bpf_get_netns_cookie_sock_proto = {
4661         .func           = bpf_get_netns_cookie_sock,
4662         .gpl_only       = false,
4663         .ret_type       = RET_INTEGER,
4664         .arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
4665 };
4666
4667 BPF_CALL_1(bpf_get_netns_cookie_sock_addr, struct bpf_sock_addr_kern *, ctx)
4668 {
4669         return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
4670 }
4671
4672 static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = {
4673         .func           = bpf_get_netns_cookie_sock_addr,
4674         .gpl_only       = false,
4675         .ret_type       = RET_INTEGER,
4676         .arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
4677 };
4678
4679 BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
4680 {
4681         struct sock *sk = sk_to_full_sk(skb->sk);
4682         kuid_t kuid;
4683
4684         if (!sk || !sk_fullsock(sk))
4685                 return overflowuid;
4686         kuid = sock_net_uid(sock_net(sk), sk);
4687         return from_kuid_munged(sock_net(sk)->user_ns, kuid);
4688 }
4689
4690 static const struct bpf_func_proto bpf_get_socket_uid_proto = {
4691         .func           = bpf_get_socket_uid,
4692         .gpl_only       = false,
4693         .ret_type       = RET_INTEGER,
4694         .arg1_type      = ARG_PTR_TO_CTX,
4695 };
4696
4697 static int _bpf_setsockopt(struct sock *sk, int level, int optname,
4698                            char *optval, int optlen)
4699 {
4700         char devname[IFNAMSIZ];
4701         int val, valbool;
4702         struct net *net;
4703         int ifindex;
4704         int ret = 0;
4705
4706         if (!sk_fullsock(sk))
4707                 return -EINVAL;
4708
4709         sock_owned_by_me(sk);
4710
4711         if (level == SOL_SOCKET) {
4712                 if (optlen != sizeof(int) && optname != SO_BINDTODEVICE)
4713                         return -EINVAL;
4714                 val = *((int *)optval);
4715                 valbool = val ? 1 : 0;
4716
4717                 /* Only some socketops are supported */
4718                 switch (optname) {
4719                 case SO_RCVBUF:
4720                         val = min_t(u32, val, sysctl_rmem_max);
4721                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
4722                         WRITE_ONCE(sk->sk_rcvbuf,
4723                                    max_t(int, val * 2, SOCK_MIN_RCVBUF));
4724                         break;
4725                 case SO_SNDBUF:
4726                         val = min_t(u32, val, sysctl_wmem_max);
4727                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
4728                         WRITE_ONCE(sk->sk_sndbuf,
4729                                    max_t(int, val * 2, SOCK_MIN_SNDBUF));
4730                         break;
4731                 case SO_MAX_PACING_RATE: /* 32bit version */
4732                         if (val != ~0U)
4733                                 cmpxchg(&sk->sk_pacing_status,
4734                                         SK_PACING_NONE,
4735                                         SK_PACING_NEEDED);
4736                         sk->sk_max_pacing_rate = (val == ~0U) ?
4737                                                  ~0UL : (unsigned int)val;
4738                         sk->sk_pacing_rate = min(sk->sk_pacing_rate,
4739                                                  sk->sk_max_pacing_rate);
4740                         break;
4741                 case SO_PRIORITY:
4742                         sk->sk_priority = val;
4743                         break;
4744                 case SO_RCVLOWAT:
4745                         if (val < 0)
4746                                 val = INT_MAX;
4747                         WRITE_ONCE(sk->sk_rcvlowat, val ? : 1);
4748                         break;
4749                 case SO_MARK:
4750                         if (sk->sk_mark != val) {
4751                                 sk->sk_mark = val;
4752                                 sk_dst_reset(sk);
4753                         }
4754                         break;
4755                 case SO_BINDTODEVICE:
4756                         optlen = min_t(long, optlen, IFNAMSIZ - 1);
4757                         strncpy(devname, optval, optlen);
4758                         devname[optlen] = 0;
4759
4760                         ifindex = 0;
4761                         if (devname[0] != '\0') {
4762                                 struct net_device *dev;
4763
4764                                 ret = -ENODEV;
4765
4766                                 net = sock_net(sk);
4767                                 dev = dev_get_by_name(net, devname);
4768                                 if (!dev)
4769                                         break;
4770                                 ifindex = dev->ifindex;
4771                                 dev_put(dev);
4772                         }
4773                         ret = sock_bindtoindex(sk, ifindex, false);
4774                         break;
4775                 case SO_KEEPALIVE:
4776                         if (sk->sk_prot->keepalive)
4777                                 sk->sk_prot->keepalive(sk, valbool);
4778                         sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
4779                         break;
4780                 default:
4781                         ret = -EINVAL;
4782                 }
4783 #ifdef CONFIG_INET
4784         } else if (level == SOL_IP) {
4785                 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4786                         return -EINVAL;
4787
4788                 val = *((int *)optval);
4789                 /* Only some options are supported */
4790                 switch (optname) {
4791                 case IP_TOS:
4792                         if (val < -1 || val > 0xff) {
4793                                 ret = -EINVAL;
4794                         } else {
4795                                 struct inet_sock *inet = inet_sk(sk);
4796
4797                                 if (val == -1)
4798                                         val = 0;
4799                                 inet->tos = val;
4800                         }
4801                         break;
4802                 default:
4803                         ret = -EINVAL;
4804                 }
4805 #if IS_ENABLED(CONFIG_IPV6)
4806         } else if (level == SOL_IPV6) {
4807                 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4808                         return -EINVAL;
4809
4810                 val = *((int *)optval);
4811                 /* Only some options are supported */
4812                 switch (optname) {
4813                 case IPV6_TCLASS:
4814                         if (val < -1 || val > 0xff) {
4815                                 ret = -EINVAL;
4816                         } else {
4817                                 struct ipv6_pinfo *np = inet6_sk(sk);
4818
4819                                 if (val == -1)
4820                                         val = 0;
4821                                 np->tclass = val;
4822                         }
4823                         break;
4824                 default:
4825                         ret = -EINVAL;
4826                 }
4827 #endif
4828         } else if (level == SOL_TCP &&
4829                    sk->sk_prot->setsockopt == tcp_setsockopt) {
4830                 if (optname == TCP_CONGESTION) {
4831                         char name[TCP_CA_NAME_MAX];
4832
4833                         strncpy(name, optval, min_t(long, optlen,
4834                                                     TCP_CA_NAME_MAX-1));
4835                         name[TCP_CA_NAME_MAX-1] = 0;
4836                         ret = tcp_set_congestion_control(sk, name, false, true);
4837                 } else {
4838                         struct inet_connection_sock *icsk = inet_csk(sk);
4839                         struct tcp_sock *tp = tcp_sk(sk);
4840                         unsigned long timeout;
4841
4842                         if (optlen != sizeof(int))
4843                                 return -EINVAL;
4844
4845                         val = *((int *)optval);
4846                         /* Only some options are supported */
4847                         switch (optname) {
4848                         case TCP_BPF_IW:
4849                                 if (val <= 0 || tp->data_segs_out > tp->syn_data)
4850                                         ret = -EINVAL;
4851                                 else
4852                                         tp->snd_cwnd = val;
4853                                 break;
4854                         case TCP_BPF_SNDCWND_CLAMP:
4855                                 if (val <= 0) {
4856                                         ret = -EINVAL;
4857                                 } else {
4858                                         tp->snd_cwnd_clamp = val;
4859                                         tp->snd_ssthresh = val;
4860                                 }
4861                                 break;
4862                         case TCP_BPF_DELACK_MAX:
4863                                 timeout = usecs_to_jiffies(val);
4864                                 if (timeout > TCP_DELACK_MAX ||
4865                                     timeout < TCP_TIMEOUT_MIN)
4866                                         return -EINVAL;
4867                                 inet_csk(sk)->icsk_delack_max = timeout;
4868                                 break;
4869                         case TCP_BPF_RTO_MIN:
4870                                 timeout = usecs_to_jiffies(val);
4871                                 if (timeout > TCP_RTO_MIN ||
4872                                     timeout < TCP_TIMEOUT_MIN)
4873                                         return -EINVAL;
4874                                 inet_csk(sk)->icsk_rto_min = timeout;
4875                                 break;
4876                         case TCP_SAVE_SYN:
4877                                 if (val < 0 || val > 1)
4878                                         ret = -EINVAL;
4879                                 else
4880                                         tp->save_syn = val;
4881                                 break;
4882                         case TCP_KEEPIDLE:
4883                                 ret = tcp_sock_set_keepidle_locked(sk, val);
4884                                 break;
4885                         case TCP_KEEPINTVL:
4886                                 if (val < 1 || val > MAX_TCP_KEEPINTVL)
4887                                         ret = -EINVAL;
4888                                 else
4889                                         tp->keepalive_intvl = val * HZ;
4890                                 break;
4891                         case TCP_KEEPCNT:
4892                                 if (val < 1 || val > MAX_TCP_KEEPCNT)
4893                                         ret = -EINVAL;
4894                                 else
4895                                         tp->keepalive_probes = val;
4896                                 break;
4897                         case TCP_SYNCNT:
4898                                 if (val < 1 || val > MAX_TCP_SYNCNT)
4899                                         ret = -EINVAL;
4900                                 else
4901                                         icsk->icsk_syn_retries = val;
4902                                 break;
4903                         case TCP_USER_TIMEOUT:
4904                                 if (val < 0)
4905                                         ret = -EINVAL;
4906                                 else
4907                                         icsk->icsk_user_timeout = val;
4908                                 break;
4909                         case TCP_NOTSENT_LOWAT:
4910                                 tp->notsent_lowat = val;
4911                                 sk->sk_write_space(sk);
4912                                 break;
4913                         case TCP_WINDOW_CLAMP:
4914                                 ret = tcp_set_window_clamp(sk, val);
4915                                 break;
4916                         default:
4917                                 ret = -EINVAL;
4918                         }
4919                 }
4920 #endif
4921         } else {
4922                 ret = -EINVAL;
4923         }
4924         return ret;
4925 }
4926
4927 static int _bpf_getsockopt(struct sock *sk, int level, int optname,
4928                            char *optval, int optlen)
4929 {
4930         if (!sk_fullsock(sk))
4931                 goto err_clear;
4932
4933         sock_owned_by_me(sk);
4934
4935 #ifdef CONFIG_INET
4936         if (level == SOL_TCP && sk->sk_prot->getsockopt == tcp_getsockopt) {
4937                 struct inet_connection_sock *icsk;
4938                 struct tcp_sock *tp;
4939
4940                 switch (optname) {
4941                 case TCP_CONGESTION:
4942                         icsk = inet_csk(sk);
4943
4944                         if (!icsk->icsk_ca_ops || optlen <= 1)
4945                                 goto err_clear;
4946                         strncpy(optval, icsk->icsk_ca_ops->name, optlen);
4947                         optval[optlen - 1] = 0;
4948                         break;
4949                 case TCP_SAVED_SYN:
4950                         tp = tcp_sk(sk);
4951
4952                         if (optlen <= 0 || !tp->saved_syn ||
4953                             optlen > tcp_saved_syn_len(tp->saved_syn))
4954                                 goto err_clear;
4955                         memcpy(optval, tp->saved_syn->data, optlen);
4956                         break;
4957                 default:
4958                         goto err_clear;
4959                 }
4960         } else if (level == SOL_IP) {
4961                 struct inet_sock *inet = inet_sk(sk);
4962
4963                 if (optlen != sizeof(int) || sk->sk_family != AF_INET)
4964                         goto err_clear;
4965
4966                 /* Only some options are supported */
4967                 switch (optname) {
4968                 case IP_TOS:
4969                         *((int *)optval) = (int)inet->tos;
4970                         break;
4971                 default:
4972                         goto err_clear;
4973                 }
4974 #if IS_ENABLED(CONFIG_IPV6)
4975         } else if (level == SOL_IPV6) {
4976                 struct ipv6_pinfo *np = inet6_sk(sk);
4977
4978                 if (optlen != sizeof(int) || sk->sk_family != AF_INET6)
4979                         goto err_clear;
4980
4981                 /* Only some options are supported */
4982                 switch (optname) {
4983                 case IPV6_TCLASS:
4984                         *((int *)optval) = (int)np->tclass;
4985                         break;
4986                 default:
4987                         goto err_clear;
4988                 }
4989 #endif
4990         } else {
4991                 goto err_clear;
4992         }
4993         return 0;
4994 #endif
4995 err_clear:
4996         memset(optval, 0, optlen);
4997         return -EINVAL;
4998 }
4999
5000 BPF_CALL_5(bpf_sock_addr_setsockopt, struct bpf_sock_addr_kern *, ctx,
5001            int, level, int, optname, char *, optval, int, optlen)
5002 {
5003         return _bpf_setsockopt(ctx->sk, level, optname, optval, optlen);
5004 }
5005
5006 static const struct bpf_func_proto bpf_sock_addr_setsockopt_proto = {
5007         .func           = bpf_sock_addr_setsockopt,
5008         .gpl_only       = false,
5009         .ret_type       = RET_INTEGER,
5010         .arg1_type      = ARG_PTR_TO_CTX,
5011         .arg2_type      = ARG_ANYTHING,
5012         .arg3_type      = ARG_ANYTHING,
5013         .arg4_type      = ARG_PTR_TO_MEM,
5014         .arg5_type      = ARG_CONST_SIZE,
5015 };
5016
5017 BPF_CALL_5(bpf_sock_addr_getsockopt, struct bpf_sock_addr_kern *, ctx,
5018            int, level, int, optname, char *, optval, int, optlen)
5019 {
5020         return _bpf_getsockopt(ctx->sk, level, optname, optval, optlen);
5021 }
5022
5023 static const struct bpf_func_proto bpf_sock_addr_getsockopt_proto = {
5024         .func           = bpf_sock_addr_getsockopt,
5025         .gpl_only       = false,
5026         .ret_type       = RET_INTEGER,
5027         .arg1_type      = ARG_PTR_TO_CTX,
5028         .arg2_type      = ARG_ANYTHING,
5029         .arg3_type      = ARG_ANYTHING,
5030         .arg4_type      = ARG_PTR_TO_UNINIT_MEM,
5031         .arg5_type      = ARG_CONST_SIZE,
5032 };
5033
5034 BPF_CALL_5(bpf_sock_ops_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
5035            int, level, int, optname, char *, optval, int, optlen)
5036 {
5037         return _bpf_setsockopt(bpf_sock->sk, level, optname, optval, optlen);
5038 }
5039
5040 static const struct bpf_func_proto bpf_sock_ops_setsockopt_proto = {
5041         .func           = bpf_sock_ops_setsockopt,
5042         .gpl_only       = false,
5043         .ret_type       = RET_INTEGER,
5044         .arg1_type      = ARG_PTR_TO_CTX,
5045         .arg2_type      = ARG_ANYTHING,
5046         .arg3_type      = ARG_ANYTHING,
5047         .arg4_type      = ARG_PTR_TO_MEM,
5048         .arg5_type      = ARG_CONST_SIZE,
5049 };
5050
5051 static int bpf_sock_ops_get_syn(struct bpf_sock_ops_kern *bpf_sock,
5052                                 int optname, const u8 **start)
5053 {
5054         struct sk_buff *syn_skb = bpf_sock->syn_skb;
5055         const u8 *hdr_start;
5056         int ret;
5057
5058         if (syn_skb) {
5059                 /* sk is a request_sock here */
5060
5061                 if (optname == TCP_BPF_SYN) {
5062                         hdr_start = syn_skb->data;
5063                         ret = tcp_hdrlen(syn_skb);
5064                 } else if (optname == TCP_BPF_SYN_IP) {
5065                         hdr_start = skb_network_header(syn_skb);
5066                         ret = skb_network_header_len(syn_skb) +
5067                                 tcp_hdrlen(syn_skb);
5068                 } else {
5069                         /* optname == TCP_BPF_SYN_MAC */
5070                         hdr_start = skb_mac_header(syn_skb);
5071                         ret = skb_mac_header_len(syn_skb) +
5072                                 skb_network_header_len(syn_skb) +
5073                                 tcp_hdrlen(syn_skb);
5074                 }
5075         } else {
5076                 struct sock *sk = bpf_sock->sk;
5077                 struct saved_syn *saved_syn;
5078
5079                 if (sk->sk_state == TCP_NEW_SYN_RECV)
5080                         /* synack retransmit. bpf_sock->syn_skb will
5081                          * not be available.  It has to resort to
5082                          * saved_syn (if it is saved).
5083                          */
5084                         saved_syn = inet_reqsk(sk)->saved_syn;
5085                 else
5086                         saved_syn = tcp_sk(sk)->saved_syn;
5087
5088                 if (!saved_syn)
5089                         return -ENOENT;
5090
5091                 if (optname == TCP_BPF_SYN) {
5092                         hdr_start = saved_syn->data +
5093                                 saved_syn->mac_hdrlen +
5094                                 saved_syn->network_hdrlen;
5095                         ret = saved_syn->tcp_hdrlen;
5096                 } else if (optname == TCP_BPF_SYN_IP) {
5097                         hdr_start = saved_syn->data +
5098                                 saved_syn->mac_hdrlen;
5099                         ret = saved_syn->network_hdrlen +
5100                                 saved_syn->tcp_hdrlen;
5101                 } else {
5102                         /* optname == TCP_BPF_SYN_MAC */
5103
5104                         /* TCP_SAVE_SYN may not have saved the mac hdr */
5105                         if (!saved_syn->mac_hdrlen)
5106                                 return -ENOENT;
5107
5108                         hdr_start = saved_syn->data;
5109                         ret = saved_syn->mac_hdrlen +
5110                                 saved_syn->network_hdrlen +
5111                                 saved_syn->tcp_hdrlen;
5112                 }
5113         }
5114
5115         *start = hdr_start;
5116         return ret;
5117 }
5118
5119 BPF_CALL_5(bpf_sock_ops_getsockopt, struct bpf_sock_ops_kern *, bpf_sock,
5120            int, level, int, optname, char *, optval, int, optlen)
5121 {
5122         if (IS_ENABLED(CONFIG_INET) && level == SOL_TCP &&
5123             optname >= TCP_BPF_SYN && optname <= TCP_BPF_SYN_MAC) {
5124                 int ret, copy_len = 0;
5125                 const u8 *start;
5126
5127                 ret = bpf_sock_ops_get_syn(bpf_sock, optname, &start);
5128                 if (ret > 0) {
5129                         copy_len = ret;
5130                         if (optlen < copy_len) {
5131                                 copy_len = optlen;
5132                                 ret = -ENOSPC;
5133                         }
5134
5135                         memcpy(optval, start, copy_len);
5136                 }
5137
5138                 /* Zero out unused buffer at the end */
5139                 memset(optval + copy_len, 0, optlen - copy_len);
5140
5141                 return ret;
5142         }
5143
5144         return _bpf_getsockopt(bpf_sock->sk, level, optname, optval, optlen);
5145 }
5146
5147 static const struct bpf_func_proto bpf_sock_ops_getsockopt_proto = {
5148         .func           = bpf_sock_ops_getsockopt,
5149         .gpl_only       = false,
5150         .ret_type       = RET_INTEGER,
5151         .arg1_type      = ARG_PTR_TO_CTX,
5152         .arg2_type      = ARG_ANYTHING,
5153         .arg3_type      = ARG_ANYTHING,
5154         .arg4_type      = ARG_PTR_TO_UNINIT_MEM,
5155         .arg5_type      = ARG_CONST_SIZE,
5156 };
5157
5158 BPF_CALL_2(bpf_sock_ops_cb_flags_set, struct bpf_sock_ops_kern *, bpf_sock,
5159            int, argval)
5160 {
5161         struct sock *sk = bpf_sock->sk;
5162         int val = argval & BPF_SOCK_OPS_ALL_CB_FLAGS;
5163
5164         if (!IS_ENABLED(CONFIG_INET) || !sk_fullsock(sk))
5165                 return -EINVAL;
5166
5167         tcp_sk(sk)->bpf_sock_ops_cb_flags = val;
5168
5169         return argval & (~BPF_SOCK_OPS_ALL_CB_FLAGS);
5170 }
5171
5172 static const struct bpf_func_proto bpf_sock_ops_cb_flags_set_proto = {
5173         .func           = bpf_sock_ops_cb_flags_set,
5174         .gpl_only       = false,
5175         .ret_type       = RET_INTEGER,
5176         .arg1_type      = ARG_PTR_TO_CTX,
5177         .arg2_type      = ARG_ANYTHING,
5178 };
5179
5180 const struct ipv6_bpf_stub *ipv6_bpf_stub __read_mostly;
5181 EXPORT_SYMBOL_GPL(ipv6_bpf_stub);
5182
5183 BPF_CALL_3(bpf_bind, struct bpf_sock_addr_kern *, ctx, struct sockaddr *, addr,
5184            int, addr_len)
5185 {
5186 #ifdef CONFIG_INET
5187         struct sock *sk = ctx->sk;
5188         u32 flags = BIND_FROM_BPF;
5189         int err;
5190
5191         err = -EINVAL;
5192         if (addr_len < offsetofend(struct sockaddr, sa_family))
5193                 return err;
5194         if (addr->sa_family == AF_INET) {
5195                 if (addr_len < sizeof(struct sockaddr_in))
5196                         return err;
5197                 if (((struct sockaddr_in *)addr)->sin_port == htons(0))
5198                         flags |= BIND_FORCE_ADDRESS_NO_PORT;
5199                 return __inet_bind(sk, addr, addr_len, flags);
5200 #if IS_ENABLED(CONFIG_IPV6)
5201         } else if (addr->sa_family == AF_INET6) {
5202                 if (addr_len < SIN6_LEN_RFC2133)
5203                         return err;
5204                 if (((struct sockaddr_in6 *)addr)->sin6_port == htons(0))
5205                         flags |= BIND_FORCE_ADDRESS_NO_PORT;
5206                 /* ipv6_bpf_stub cannot be NULL, since it's called from
5207                  * bpf_cgroup_inet6_connect hook and ipv6 is already loaded
5208                  */
5209                 return ipv6_bpf_stub->inet6_bind(sk, addr, addr_len, flags);
5210 #endif /* CONFIG_IPV6 */
5211         }
5212 #endif /* CONFIG_INET */
5213
5214         return -EAFNOSUPPORT;
5215 }
5216
5217 static const struct bpf_func_proto bpf_bind_proto = {
5218         .func           = bpf_bind,
5219         .gpl_only       = false,
5220         .ret_type       = RET_INTEGER,
5221         .arg1_type      = ARG_PTR_TO_CTX,
5222         .arg2_type      = ARG_PTR_TO_MEM,
5223         .arg3_type      = ARG_CONST_SIZE,
5224 };
5225
5226 #ifdef CONFIG_XFRM
5227 BPF_CALL_5(bpf_skb_get_xfrm_state, struct sk_buff *, skb, u32, index,
5228            struct bpf_xfrm_state *, to, u32, size, u64, flags)
5229 {
5230         const struct sec_path *sp = skb_sec_path(skb);
5231         const struct xfrm_state *x;
5232
5233         if (!sp || unlikely(index >= sp->len || flags))
5234                 goto err_clear;
5235
5236         x = sp->xvec[index];
5237
5238         if (unlikely(size != sizeof(struct bpf_xfrm_state)))
5239                 goto err_clear;
5240
5241         to->reqid = x->props.reqid;
5242         to->spi = x->id.spi;
5243         to->family = x->props.family;
5244         to->ext = 0;
5245
5246         if (to->family == AF_INET6) {
5247                 memcpy(to->remote_ipv6, x->props.saddr.a6,
5248                        sizeof(to->remote_ipv6));
5249         } else {
5250                 to->remote_ipv4 = x->props.saddr.a4;
5251                 memset(&to->remote_ipv6[1], 0, sizeof(__u32) * 3);
5252         }
5253
5254         return 0;
5255 err_clear:
5256         memset(to, 0, size);
5257         return -EINVAL;
5258 }
5259
5260 static const struct bpf_func_proto bpf_skb_get_xfrm_state_proto = {
5261         .func           = bpf_skb_get_xfrm_state,
5262         .gpl_only       = false,
5263         .ret_type       = RET_INTEGER,
5264         .arg1_type      = ARG_PTR_TO_CTX,
5265         .arg2_type      = ARG_ANYTHING,
5266         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
5267         .arg4_type      = ARG_CONST_SIZE,
5268         .arg5_type      = ARG_ANYTHING,
5269 };
5270 #endif
5271
5272 #if IS_ENABLED(CONFIG_INET) || IS_ENABLED(CONFIG_IPV6)
5273 static int bpf_fib_set_fwd_params(struct bpf_fib_lookup *params,
5274                                   const struct neighbour *neigh,
5275                                   const struct net_device *dev)
5276 {
5277         memcpy(params->dmac, neigh->ha, ETH_ALEN);
5278         memcpy(params->smac, dev->dev_addr, ETH_ALEN);
5279         params->h_vlan_TCI = 0;
5280         params->h_vlan_proto = 0;
5281
5282         return 0;
5283 }
5284 #endif
5285
5286 #if IS_ENABLED(CONFIG_INET)
5287 static int bpf_ipv4_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
5288                                u32 flags, bool check_mtu)
5289 {
5290         struct fib_nh_common *nhc;
5291         struct in_device *in_dev;
5292         struct neighbour *neigh;
5293         struct net_device *dev;
5294         struct fib_result res;
5295         struct flowi4 fl4;
5296         int err;
5297         u32 mtu;
5298
5299         dev = dev_get_by_index_rcu(net, params->ifindex);
5300         if (unlikely(!dev))
5301                 return -ENODEV;
5302
5303         /* verify forwarding is enabled on this interface */
5304         in_dev = __in_dev_get_rcu(dev);
5305         if (unlikely(!in_dev || !IN_DEV_FORWARD(in_dev)))
5306                 return BPF_FIB_LKUP_RET_FWD_DISABLED;
5307
5308         if (flags & BPF_FIB_LOOKUP_OUTPUT) {
5309                 fl4.flowi4_iif = 1;
5310                 fl4.flowi4_oif = params->ifindex;
5311         } else {
5312                 fl4.flowi4_iif = params->ifindex;
5313                 fl4.flowi4_oif = 0;
5314         }
5315         fl4.flowi4_tos = params->tos & IPTOS_RT_MASK;
5316         fl4.flowi4_scope = RT_SCOPE_UNIVERSE;
5317         fl4.flowi4_flags = 0;
5318
5319         fl4.flowi4_proto = params->l4_protocol;
5320         fl4.daddr = params->ipv4_dst;
5321         fl4.saddr = params->ipv4_src;
5322         fl4.fl4_sport = params->sport;
5323         fl4.fl4_dport = params->dport;
5324         fl4.flowi4_multipath_hash = 0;
5325
5326         if (flags & BPF_FIB_LOOKUP_DIRECT) {
5327                 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
5328                 struct fib_table *tb;
5329
5330                 tb = fib_get_table(net, tbid);
5331                 if (unlikely(!tb))
5332                         return BPF_FIB_LKUP_RET_NOT_FWDED;
5333
5334                 err = fib_table_lookup(tb, &fl4, &res, FIB_LOOKUP_NOREF);
5335         } else {
5336                 fl4.flowi4_mark = 0;
5337                 fl4.flowi4_secid = 0;
5338                 fl4.flowi4_tun_key.tun_id = 0;
5339                 fl4.flowi4_uid = sock_net_uid(net, NULL);
5340
5341                 err = fib_lookup(net, &fl4, &res, FIB_LOOKUP_NOREF);
5342         }
5343
5344         if (err) {
5345                 /* map fib lookup errors to RTN_ type */
5346                 if (err == -EINVAL)
5347                         return BPF_FIB_LKUP_RET_BLACKHOLE;
5348                 if (err == -EHOSTUNREACH)
5349                         return BPF_FIB_LKUP_RET_UNREACHABLE;
5350                 if (err == -EACCES)
5351                         return BPF_FIB_LKUP_RET_PROHIBIT;
5352
5353                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5354         }
5355
5356         if (res.type != RTN_UNICAST)
5357                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5358
5359         if (fib_info_num_path(res.fi) > 1)
5360                 fib_select_path(net, &res, &fl4, NULL);
5361
5362         if (check_mtu) {
5363                 mtu = ip_mtu_from_fib_result(&res, params->ipv4_dst);
5364                 if (params->tot_len > mtu)
5365                         return BPF_FIB_LKUP_RET_FRAG_NEEDED;
5366         }
5367
5368         nhc = res.nhc;
5369
5370         /* do not handle lwt encaps right now */
5371         if (nhc->nhc_lwtstate)
5372                 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
5373
5374         dev = nhc->nhc_dev;
5375
5376         params->rt_metric = res.fi->fib_priority;
5377         params->ifindex = dev->ifindex;
5378
5379         /* xdp and cls_bpf programs are run in RCU-bh so
5380          * rcu_read_lock_bh is not needed here
5381          */
5382         if (likely(nhc->nhc_gw_family != AF_INET6)) {
5383                 if (nhc->nhc_gw_family)
5384                         params->ipv4_dst = nhc->nhc_gw.ipv4;
5385
5386                 neigh = __ipv4_neigh_lookup_noref(dev,
5387                                                  (__force u32)params->ipv4_dst);
5388         } else {
5389                 struct in6_addr *dst = (struct in6_addr *)params->ipv6_dst;
5390
5391                 params->family = AF_INET6;
5392                 *dst = nhc->nhc_gw.ipv6;
5393                 neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
5394         }
5395
5396         if (!neigh)
5397                 return BPF_FIB_LKUP_RET_NO_NEIGH;
5398
5399         return bpf_fib_set_fwd_params(params, neigh, dev);
5400 }
5401 #endif
5402
5403 #if IS_ENABLED(CONFIG_IPV6)
5404 static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
5405                                u32 flags, bool check_mtu)
5406 {
5407         struct in6_addr *src = (struct in6_addr *) params->ipv6_src;
5408         struct in6_addr *dst = (struct in6_addr *) params->ipv6_dst;
5409         struct fib6_result res = {};
5410         struct neighbour *neigh;
5411         struct net_device *dev;
5412         struct inet6_dev *idev;
5413         struct flowi6 fl6;
5414         int strict = 0;
5415         int oif, err;
5416         u32 mtu;
5417
5418         /* link local addresses are never forwarded */
5419         if (rt6_need_strict(dst) || rt6_need_strict(src))
5420                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5421
5422         dev = dev_get_by_index_rcu(net, params->ifindex);
5423         if (unlikely(!dev))
5424                 return -ENODEV;
5425
5426         idev = __in6_dev_get_safely(dev);
5427         if (unlikely(!idev || !idev->cnf.forwarding))
5428                 return BPF_FIB_LKUP_RET_FWD_DISABLED;
5429
5430         if (flags & BPF_FIB_LOOKUP_OUTPUT) {
5431                 fl6.flowi6_iif = 1;
5432                 oif = fl6.flowi6_oif = params->ifindex;
5433         } else {
5434                 oif = fl6.flowi6_iif = params->ifindex;
5435                 fl6.flowi6_oif = 0;
5436                 strict = RT6_LOOKUP_F_HAS_SADDR;
5437         }
5438         fl6.flowlabel = params->flowinfo;
5439         fl6.flowi6_scope = 0;
5440         fl6.flowi6_flags = 0;
5441         fl6.mp_hash = 0;
5442
5443         fl6.flowi6_proto = params->l4_protocol;
5444         fl6.daddr = *dst;
5445         fl6.saddr = *src;
5446         fl6.fl6_sport = params->sport;
5447         fl6.fl6_dport = params->dport;
5448
5449         if (flags & BPF_FIB_LOOKUP_DIRECT) {
5450                 u32 tbid = l3mdev_fib_table_rcu(dev) ? : RT_TABLE_MAIN;
5451                 struct fib6_table *tb;
5452
5453                 tb = ipv6_stub->fib6_get_table(net, tbid);
5454                 if (unlikely(!tb))
5455                         return BPF_FIB_LKUP_RET_NOT_FWDED;
5456
5457                 err = ipv6_stub->fib6_table_lookup(net, tb, oif, &fl6, &res,
5458                                                    strict);
5459         } else {
5460                 fl6.flowi6_mark = 0;
5461                 fl6.flowi6_secid = 0;
5462                 fl6.flowi6_tun_key.tun_id = 0;
5463                 fl6.flowi6_uid = sock_net_uid(net, NULL);
5464
5465                 err = ipv6_stub->fib6_lookup(net, oif, &fl6, &res, strict);
5466         }
5467
5468         if (unlikely(err || IS_ERR_OR_NULL(res.f6i) ||
5469                      res.f6i == net->ipv6.fib6_null_entry))
5470                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5471
5472         switch (res.fib6_type) {
5473         /* only unicast is forwarded */
5474         case RTN_UNICAST:
5475                 break;
5476         case RTN_BLACKHOLE:
5477                 return BPF_FIB_LKUP_RET_BLACKHOLE;
5478         case RTN_UNREACHABLE:
5479                 return BPF_FIB_LKUP_RET_UNREACHABLE;
5480         case RTN_PROHIBIT:
5481                 return BPF_FIB_LKUP_RET_PROHIBIT;
5482         default:
5483                 return BPF_FIB_LKUP_RET_NOT_FWDED;
5484         }
5485
5486         ipv6_stub->fib6_select_path(net, &res, &fl6, fl6.flowi6_oif,
5487                                     fl6.flowi6_oif != 0, NULL, strict);
5488
5489         if (check_mtu) {
5490                 mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src);
5491                 if (params->tot_len > mtu)
5492                         return BPF_FIB_LKUP_RET_FRAG_NEEDED;
5493         }
5494
5495         if (res.nh->fib_nh_lws)
5496                 return BPF_FIB_LKUP_RET_UNSUPP_LWT;
5497
5498         if (res.nh->fib_nh_gw_family)
5499                 *dst = res.nh->fib_nh_gw6;
5500
5501         dev = res.nh->fib_nh_dev;
5502         params->rt_metric = res.f6i->fib6_metric;
5503         params->ifindex = dev->ifindex;
5504
5505         /* xdp and cls_bpf programs are run in RCU-bh so rcu_read_lock_bh is
5506          * not needed here.
5507          */
5508         neigh = __ipv6_neigh_lookup_noref_stub(dev, dst);
5509         if (!neigh)
5510                 return BPF_FIB_LKUP_RET_NO_NEIGH;
5511
5512         return bpf_fib_set_fwd_params(params, neigh, dev);
5513 }
5514 #endif
5515
5516 BPF_CALL_4(bpf_xdp_fib_lookup, struct xdp_buff *, ctx,
5517            struct bpf_fib_lookup *, params, int, plen, u32, flags)
5518 {
5519         if (plen < sizeof(*params))
5520                 return -EINVAL;
5521
5522         if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
5523                 return -EINVAL;
5524
5525         switch (params->family) {
5526 #if IS_ENABLED(CONFIG_INET)
5527         case AF_INET:
5528                 return bpf_ipv4_fib_lookup(dev_net(ctx->rxq->dev), params,
5529                                            flags, true);
5530 #endif
5531 #if IS_ENABLED(CONFIG_IPV6)
5532         case AF_INET6:
5533                 return bpf_ipv6_fib_lookup(dev_net(ctx->rxq->dev), params,
5534                                            flags, true);
5535 #endif
5536         }
5537         return -EAFNOSUPPORT;
5538 }
5539
5540 static const struct bpf_func_proto bpf_xdp_fib_lookup_proto = {
5541         .func           = bpf_xdp_fib_lookup,
5542         .gpl_only       = true,
5543         .ret_type       = RET_INTEGER,
5544         .arg1_type      = ARG_PTR_TO_CTX,
5545         .arg2_type      = ARG_PTR_TO_MEM,
5546         .arg3_type      = ARG_CONST_SIZE,
5547         .arg4_type      = ARG_ANYTHING,
5548 };
5549
5550 BPF_CALL_4(bpf_skb_fib_lookup, struct sk_buff *, skb,
5551            struct bpf_fib_lookup *, params, int, plen, u32, flags)
5552 {
5553         struct net *net = dev_net(skb->dev);
5554         int rc = -EAFNOSUPPORT;
5555
5556         if (plen < sizeof(*params))
5557                 return -EINVAL;
5558
5559         if (flags & ~(BPF_FIB_LOOKUP_DIRECT | BPF_FIB_LOOKUP_OUTPUT))
5560                 return -EINVAL;
5561
5562         switch (params->family) {
5563 #if IS_ENABLED(CONFIG_INET)
5564         case AF_INET:
5565                 rc = bpf_ipv4_fib_lookup(net, params, flags, false);
5566                 break;
5567 #endif
5568 #if IS_ENABLED(CONFIG_IPV6)
5569         case AF_INET6:
5570                 rc = bpf_ipv6_fib_lookup(net, params, flags, false);
5571                 break;
5572 #endif
5573         }
5574
5575         if (!rc) {
5576                 struct net_device *dev;
5577
5578                 dev = dev_get_by_index_rcu(net, params->ifindex);
5579                 if (!is_skb_forwardable(dev, skb))
5580                         rc = BPF_FIB_LKUP_RET_FRAG_NEEDED;
5581         }
5582
5583         return rc;
5584 }
5585
5586 static const struct bpf_func_proto bpf_skb_fib_lookup_proto = {
5587         .func           = bpf_skb_fib_lookup,
5588         .gpl_only       = true,
5589         .ret_type       = RET_INTEGER,
5590         .arg1_type      = ARG_PTR_TO_CTX,
5591         .arg2_type      = ARG_PTR_TO_MEM,
5592         .arg3_type      = ARG_CONST_SIZE,
5593         .arg4_type      = ARG_ANYTHING,
5594 };
5595
5596 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5597 static int bpf_push_seg6_encap(struct sk_buff *skb, u32 type, void *hdr, u32 len)
5598 {
5599         int err;
5600         struct ipv6_sr_hdr *srh = (struct ipv6_sr_hdr *)hdr;
5601
5602         if (!seg6_validate_srh(srh, len, false))
5603                 return -EINVAL;
5604
5605         switch (type) {
5606         case BPF_LWT_ENCAP_SEG6_INLINE:
5607                 if (skb->protocol != htons(ETH_P_IPV6))
5608                         return -EBADMSG;
5609
5610                 err = seg6_do_srh_inline(skb, srh);
5611                 break;
5612         case BPF_LWT_ENCAP_SEG6:
5613                 skb_reset_inner_headers(skb);
5614                 skb->encapsulation = 1;
5615                 err = seg6_do_srh_encap(skb, srh, IPPROTO_IPV6);
5616                 break;
5617         default:
5618                 return -EINVAL;
5619         }
5620
5621         bpf_compute_data_pointers(skb);
5622         if (err)
5623                 return err;
5624
5625         ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
5626         skb_set_transport_header(skb, sizeof(struct ipv6hdr));
5627
5628         return seg6_lookup_nexthop(skb, NULL, 0);
5629 }
5630 #endif /* CONFIG_IPV6_SEG6_BPF */
5631
5632 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
5633 static int bpf_push_ip_encap(struct sk_buff *skb, void *hdr, u32 len,
5634                              bool ingress)
5635 {
5636         return bpf_lwt_push_ip_encap(skb, hdr, len, ingress);
5637 }
5638 #endif
5639
5640 BPF_CALL_4(bpf_lwt_in_push_encap, struct sk_buff *, skb, u32, type, void *, hdr,
5641            u32, len)
5642 {
5643         switch (type) {
5644 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5645         case BPF_LWT_ENCAP_SEG6:
5646         case BPF_LWT_ENCAP_SEG6_INLINE:
5647                 return bpf_push_seg6_encap(skb, type, hdr, len);
5648 #endif
5649 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
5650         case BPF_LWT_ENCAP_IP:
5651                 return bpf_push_ip_encap(skb, hdr, len, true /* ingress */);
5652 #endif
5653         default:
5654                 return -EINVAL;
5655         }
5656 }
5657
5658 BPF_CALL_4(bpf_lwt_xmit_push_encap, struct sk_buff *, skb, u32, type,
5659            void *, hdr, u32, len)
5660 {
5661         switch (type) {
5662 #if IS_ENABLED(CONFIG_LWTUNNEL_BPF)
5663         case BPF_LWT_ENCAP_IP:
5664                 return bpf_push_ip_encap(skb, hdr, len, false /* egress */);
5665 #endif
5666         default:
5667                 return -EINVAL;
5668         }
5669 }
5670
5671 static const struct bpf_func_proto bpf_lwt_in_push_encap_proto = {
5672         .func           = bpf_lwt_in_push_encap,
5673         .gpl_only       = false,
5674         .ret_type       = RET_INTEGER,
5675         .arg1_type      = ARG_PTR_TO_CTX,
5676         .arg2_type      = ARG_ANYTHING,
5677         .arg3_type      = ARG_PTR_TO_MEM,
5678         .arg4_type      = ARG_CONST_SIZE
5679 };
5680
5681 static const struct bpf_func_proto bpf_lwt_xmit_push_encap_proto = {
5682         .func           = bpf_lwt_xmit_push_encap,
5683         .gpl_only       = false,
5684         .ret_type       = RET_INTEGER,
5685         .arg1_type      = ARG_PTR_TO_CTX,
5686         .arg2_type      = ARG_ANYTHING,
5687         .arg3_type      = ARG_PTR_TO_MEM,
5688         .arg4_type      = ARG_CONST_SIZE
5689 };
5690
5691 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
5692 BPF_CALL_4(bpf_lwt_seg6_store_bytes, struct sk_buff *, skb, u32, offset,
5693            const void *, from, u32, len)
5694 {
5695         struct seg6_bpf_srh_state *srh_state =
5696                 this_cpu_ptr(&seg6_bpf_srh_states);
5697         struct ipv6_sr_hdr *srh = srh_state->srh;
5698         void *srh_tlvs, *srh_end, *ptr;
5699         int srhoff = 0;
5700
5701         if (srh == NULL)
5702                 return -EINVAL;
5703
5704         srh_tlvs = (void *)((char *)srh + ((srh->first_segment + 1) << 4));
5705         srh_end = (void *)((char *)srh + sizeof(*srh) + srh_state->hdrlen);
5706
5707         ptr = skb->data + offset;
5708         if (ptr >= srh_tlvs && ptr + len <= srh_end)
5709                 srh_state->valid = false;
5710         else if (ptr < (void *)&srh->flags ||
5711                  ptr + len > (void *)&srh->segments)
5712                 return -EFAULT;
5713
5714         if (unlikely(bpf_try_make_writable(skb, offset + len)))
5715                 return -EFAULT;
5716         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
5717                 return -EINVAL;
5718         srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5719
5720         memcpy(skb->data + offset, from, len);
5721         return 0;
5722 }
5723
5724 static const struct bpf_func_proto bpf_lwt_seg6_store_bytes_proto = {
5725         .func           = bpf_lwt_seg6_store_bytes,
5726         .gpl_only       = false,
5727         .ret_type       = RET_INTEGER,
5728         .arg1_type      = ARG_PTR_TO_CTX,
5729         .arg2_type      = ARG_ANYTHING,
5730         .arg3_type      = ARG_PTR_TO_MEM,
5731         .arg4_type      = ARG_CONST_SIZE
5732 };
5733
5734 static void bpf_update_srh_state(struct sk_buff *skb)
5735 {
5736         struct seg6_bpf_srh_state *srh_state =
5737                 this_cpu_ptr(&seg6_bpf_srh_states);
5738         int srhoff = 0;
5739
5740         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0) {
5741                 srh_state->srh = NULL;
5742         } else {
5743                 srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5744                 srh_state->hdrlen = srh_state->srh->hdrlen << 3;
5745                 srh_state->valid = true;
5746         }
5747 }
5748
5749 BPF_CALL_4(bpf_lwt_seg6_action, struct sk_buff *, skb,
5750            u32, action, void *, param, u32, param_len)
5751 {
5752         struct seg6_bpf_srh_state *srh_state =
5753                 this_cpu_ptr(&seg6_bpf_srh_states);
5754         int hdroff = 0;
5755         int err;
5756
5757         switch (action) {
5758         case SEG6_LOCAL_ACTION_END_X:
5759                 if (!seg6_bpf_has_valid_srh(skb))
5760                         return -EBADMSG;
5761                 if (param_len != sizeof(struct in6_addr))
5762                         return -EINVAL;
5763                 return seg6_lookup_nexthop(skb, (struct in6_addr *)param, 0);
5764         case SEG6_LOCAL_ACTION_END_T:
5765                 if (!seg6_bpf_has_valid_srh(skb))
5766                         return -EBADMSG;
5767                 if (param_len != sizeof(int))
5768                         return -EINVAL;
5769                 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
5770         case SEG6_LOCAL_ACTION_END_DT6:
5771                 if (!seg6_bpf_has_valid_srh(skb))
5772                         return -EBADMSG;
5773                 if (param_len != sizeof(int))
5774                         return -EINVAL;
5775
5776                 if (ipv6_find_hdr(skb, &hdroff, IPPROTO_IPV6, NULL, NULL) < 0)
5777                         return -EBADMSG;
5778                 if (!pskb_pull(skb, hdroff))
5779                         return -EBADMSG;
5780
5781                 skb_postpull_rcsum(skb, skb_network_header(skb), hdroff);
5782                 skb_reset_network_header(skb);
5783                 skb_reset_transport_header(skb);
5784                 skb->encapsulation = 0;
5785
5786                 bpf_compute_data_pointers(skb);
5787                 bpf_update_srh_state(skb);
5788                 return seg6_lookup_nexthop(skb, NULL, *(int *)param);
5789         case SEG6_LOCAL_ACTION_END_B6:
5790                 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
5791                         return -EBADMSG;
5792                 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6_INLINE,
5793                                           param, param_len);
5794                 if (!err)
5795                         bpf_update_srh_state(skb);
5796
5797                 return err;
5798         case SEG6_LOCAL_ACTION_END_B6_ENCAP:
5799                 if (srh_state->srh && !seg6_bpf_has_valid_srh(skb))
5800                         return -EBADMSG;
5801                 err = bpf_push_seg6_encap(skb, BPF_LWT_ENCAP_SEG6,
5802                                           param, param_len);
5803                 if (!err)
5804                         bpf_update_srh_state(skb);
5805
5806                 return err;
5807         default:
5808                 return -EINVAL;
5809         }
5810 }
5811
5812 static const struct bpf_func_proto bpf_lwt_seg6_action_proto = {
5813         .func           = bpf_lwt_seg6_action,
5814         .gpl_only       = false,
5815         .ret_type       = RET_INTEGER,
5816         .arg1_type      = ARG_PTR_TO_CTX,
5817         .arg2_type      = ARG_ANYTHING,
5818         .arg3_type      = ARG_PTR_TO_MEM,
5819         .arg4_type      = ARG_CONST_SIZE
5820 };
5821
5822 BPF_CALL_3(bpf_lwt_seg6_adjust_srh, struct sk_buff *, skb, u32, offset,
5823            s32, len)
5824 {
5825         struct seg6_bpf_srh_state *srh_state =
5826                 this_cpu_ptr(&seg6_bpf_srh_states);
5827         struct ipv6_sr_hdr *srh = srh_state->srh;
5828         void *srh_end, *srh_tlvs, *ptr;
5829         struct ipv6hdr *hdr;
5830         int srhoff = 0;
5831         int ret;
5832
5833         if (unlikely(srh == NULL))
5834                 return -EINVAL;
5835
5836         srh_tlvs = (void *)((unsigned char *)srh + sizeof(*srh) +
5837                         ((srh->first_segment + 1) << 4));
5838         srh_end = (void *)((unsigned char *)srh + sizeof(*srh) +
5839                         srh_state->hdrlen);
5840         ptr = skb->data + offset;
5841
5842         if (unlikely(ptr < srh_tlvs || ptr > srh_end))
5843                 return -EFAULT;
5844         if (unlikely(len < 0 && (void *)((char *)ptr - len) > srh_end))
5845                 return -EFAULT;
5846
5847         if (len > 0) {
5848                 ret = skb_cow_head(skb, len);
5849                 if (unlikely(ret < 0))
5850                         return ret;
5851
5852                 ret = bpf_skb_net_hdr_push(skb, offset, len);
5853         } else {
5854                 ret = bpf_skb_net_hdr_pop(skb, offset, -1 * len);
5855         }
5856
5857         bpf_compute_data_pointers(skb);
5858         if (unlikely(ret < 0))
5859                 return ret;
5860
5861         hdr = (struct ipv6hdr *)skb->data;
5862         hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
5863
5864         if (ipv6_find_hdr(skb, &srhoff, IPPROTO_ROUTING, NULL, NULL) < 0)
5865                 return -EINVAL;
5866         srh_state->srh = (struct ipv6_sr_hdr *)(skb->data + srhoff);
5867         srh_state->hdrlen += len;
5868         srh_state->valid = false;
5869         return 0;
5870 }
5871
5872 static const struct bpf_func_proto bpf_lwt_seg6_adjust_srh_proto = {
5873         .func           = bpf_lwt_seg6_adjust_srh,
5874         .gpl_only       = false,
5875         .ret_type       = RET_INTEGER,
5876         .arg1_type      = ARG_PTR_TO_CTX,
5877         .arg2_type      = ARG_ANYTHING,
5878         .arg3_type      = ARG_ANYTHING,
5879 };
5880 #endif /* CONFIG_IPV6_SEG6_BPF */
5881
5882 #ifdef CONFIG_INET
5883 static struct sock *sk_lookup(struct net *net, struct bpf_sock_tuple *tuple,
5884                               int dif, int sdif, u8 family, u8 proto)
5885 {
5886         bool refcounted = false;
5887         struct sock *sk = NULL;
5888
5889         if (family == AF_INET) {
5890                 __be32 src4 = tuple->ipv4.saddr;
5891                 __be32 dst4 = tuple->ipv4.daddr;
5892
5893                 if (proto == IPPROTO_TCP)
5894                         sk = __inet_lookup(net, &tcp_hashinfo, NULL, 0,
5895                                            src4, tuple->ipv4.sport,
5896                                            dst4, tuple->ipv4.dport,
5897                                            dif, sdif, &refcounted);
5898                 else
5899                         sk = __udp4_lib_lookup(net, src4, tuple->ipv4.sport,
5900                                                dst4, tuple->ipv4.dport,
5901                                                dif, sdif, &udp_table, NULL);
5902 #if IS_ENABLED(CONFIG_IPV6)
5903         } else {
5904                 struct in6_addr *src6 = (struct in6_addr *)&tuple->ipv6.saddr;
5905                 struct in6_addr *dst6 = (struct in6_addr *)&tuple->ipv6.daddr;
5906
5907                 if (proto == IPPROTO_TCP)
5908                         sk = __inet6_lookup(net, &tcp_hashinfo, NULL, 0,
5909                                             src6, tuple->ipv6.sport,
5910                                             dst6, ntohs(tuple->ipv6.dport),
5911                                             dif, sdif, &refcounted);
5912                 else if (likely(ipv6_bpf_stub))
5913                         sk = ipv6_bpf_stub->udp6_lib_lookup(net,
5914                                                             src6, tuple->ipv6.sport,
5915                                                             dst6, tuple->ipv6.dport,
5916                                                             dif, sdif,
5917                                                             &udp_table, NULL);
5918 #endif
5919         }
5920
5921         if (unlikely(sk && !refcounted && !sock_flag(sk, SOCK_RCU_FREE))) {
5922                 WARN_ONCE(1, "Found non-RCU, unreferenced socket!");
5923                 sk = NULL;
5924         }
5925         return sk;
5926 }
5927
5928 /* bpf_skc_lookup performs the core lookup for different types of sockets,
5929  * taking a reference on the socket if it doesn't have the flag SOCK_RCU_FREE.
5930  * Returns the socket as an 'unsigned long' to simplify the casting in the
5931  * callers to satisfy BPF_CALL declarations.
5932  */
5933 static struct sock *
5934 __bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5935                  struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
5936                  u64 flags)
5937 {
5938         struct sock *sk = NULL;
5939         u8 family = AF_UNSPEC;
5940         struct net *net;
5941         int sdif;
5942
5943         if (len == sizeof(tuple->ipv4))
5944                 family = AF_INET;
5945         else if (len == sizeof(tuple->ipv6))
5946                 family = AF_INET6;
5947         else
5948                 return NULL;
5949
5950         if (unlikely(family == AF_UNSPEC || flags ||
5951                      !((s32)netns_id < 0 || netns_id <= S32_MAX)))
5952                 goto out;
5953
5954         if (family == AF_INET)
5955                 sdif = inet_sdif(skb);
5956         else
5957                 sdif = inet6_sdif(skb);
5958
5959         if ((s32)netns_id < 0) {
5960                 net = caller_net;
5961                 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
5962         } else {
5963                 net = get_net_ns_by_id(caller_net, netns_id);
5964                 if (unlikely(!net))
5965                         goto out;
5966                 sk = sk_lookup(net, tuple, ifindex, sdif, family, proto);
5967                 put_net(net);
5968         }
5969
5970 out:
5971         return sk;
5972 }
5973
5974 static struct sock *
5975 __bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5976                 struct net *caller_net, u32 ifindex, u8 proto, u64 netns_id,
5977                 u64 flags)
5978 {
5979         struct sock *sk = __bpf_skc_lookup(skb, tuple, len, caller_net,
5980                                            ifindex, proto, netns_id, flags);
5981
5982         if (sk) {
5983                 sk = sk_to_full_sk(sk);
5984                 if (!sk_fullsock(sk)) {
5985                         sock_gen_put(sk);
5986                         return NULL;
5987                 }
5988         }
5989
5990         return sk;
5991 }
5992
5993 static struct sock *
5994 bpf_skc_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
5995                u8 proto, u64 netns_id, u64 flags)
5996 {
5997         struct net *caller_net;
5998         int ifindex;
5999
6000         if (skb->dev) {
6001                 caller_net = dev_net(skb->dev);
6002                 ifindex = skb->dev->ifindex;
6003         } else {
6004                 caller_net = sock_net(skb->sk);
6005                 ifindex = 0;
6006         }
6007
6008         return __bpf_skc_lookup(skb, tuple, len, caller_net, ifindex, proto,
6009                                 netns_id, flags);
6010 }
6011
6012 static struct sock *
6013 bpf_sk_lookup(struct sk_buff *skb, struct bpf_sock_tuple *tuple, u32 len,
6014               u8 proto, u64 netns_id, u64 flags)
6015 {
6016         struct sock *sk = bpf_skc_lookup(skb, tuple, len, proto, netns_id,
6017                                          flags);
6018
6019         if (sk) {
6020                 sk = sk_to_full_sk(sk);
6021                 if (!sk_fullsock(sk)) {
6022                         sock_gen_put(sk);
6023                         return NULL;
6024                 }
6025         }
6026
6027         return sk;
6028 }
6029
6030 BPF_CALL_5(bpf_skc_lookup_tcp, struct sk_buff *, skb,
6031            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6032 {
6033         return (unsigned long)bpf_skc_lookup(skb, tuple, len, IPPROTO_TCP,
6034                                              netns_id, flags);
6035 }
6036
6037 static const struct bpf_func_proto bpf_skc_lookup_tcp_proto = {
6038         .func           = bpf_skc_lookup_tcp,
6039         .gpl_only       = false,
6040         .pkt_access     = true,
6041         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6042         .arg1_type      = ARG_PTR_TO_CTX,
6043         .arg2_type      = ARG_PTR_TO_MEM,
6044         .arg3_type      = ARG_CONST_SIZE,
6045         .arg4_type      = ARG_ANYTHING,
6046         .arg5_type      = ARG_ANYTHING,
6047 };
6048
6049 BPF_CALL_5(bpf_sk_lookup_tcp, struct sk_buff *, skb,
6050            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6051 {
6052         return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_TCP,
6053                                             netns_id, flags);
6054 }
6055
6056 static const struct bpf_func_proto bpf_sk_lookup_tcp_proto = {
6057         .func           = bpf_sk_lookup_tcp,
6058         .gpl_only       = false,
6059         .pkt_access     = true,
6060         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6061         .arg1_type      = ARG_PTR_TO_CTX,
6062         .arg2_type      = ARG_PTR_TO_MEM,
6063         .arg3_type      = ARG_CONST_SIZE,
6064         .arg4_type      = ARG_ANYTHING,
6065         .arg5_type      = ARG_ANYTHING,
6066 };
6067
6068 BPF_CALL_5(bpf_sk_lookup_udp, struct sk_buff *, skb,
6069            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6070 {
6071         return (unsigned long)bpf_sk_lookup(skb, tuple, len, IPPROTO_UDP,
6072                                             netns_id, flags);
6073 }
6074
6075 static const struct bpf_func_proto bpf_sk_lookup_udp_proto = {
6076         .func           = bpf_sk_lookup_udp,
6077         .gpl_only       = false,
6078         .pkt_access     = true,
6079         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6080         .arg1_type      = ARG_PTR_TO_CTX,
6081         .arg2_type      = ARG_PTR_TO_MEM,
6082         .arg3_type      = ARG_CONST_SIZE,
6083         .arg4_type      = ARG_ANYTHING,
6084         .arg5_type      = ARG_ANYTHING,
6085 };
6086
6087 BPF_CALL_1(bpf_sk_release, struct sock *, sk)
6088 {
6089         if (sk && sk_is_refcounted(sk))
6090                 sock_gen_put(sk);
6091         return 0;
6092 }
6093
6094 static const struct bpf_func_proto bpf_sk_release_proto = {
6095         .func           = bpf_sk_release,
6096         .gpl_only       = false,
6097         .ret_type       = RET_INTEGER,
6098         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6099 };
6100
6101 BPF_CALL_5(bpf_xdp_sk_lookup_udp, struct xdp_buff *, ctx,
6102            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6103 {
6104         struct net *caller_net = dev_net(ctx->rxq->dev);
6105         int ifindex = ctx->rxq->dev->ifindex;
6106
6107         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
6108                                               ifindex, IPPROTO_UDP, netns_id,
6109                                               flags);
6110 }
6111
6112 static const struct bpf_func_proto bpf_xdp_sk_lookup_udp_proto = {
6113         .func           = bpf_xdp_sk_lookup_udp,
6114         .gpl_only       = false,
6115         .pkt_access     = true,
6116         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6117         .arg1_type      = ARG_PTR_TO_CTX,
6118         .arg2_type      = ARG_PTR_TO_MEM,
6119         .arg3_type      = ARG_CONST_SIZE,
6120         .arg4_type      = ARG_ANYTHING,
6121         .arg5_type      = ARG_ANYTHING,
6122 };
6123
6124 BPF_CALL_5(bpf_xdp_skc_lookup_tcp, struct xdp_buff *, ctx,
6125            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6126 {
6127         struct net *caller_net = dev_net(ctx->rxq->dev);
6128         int ifindex = ctx->rxq->dev->ifindex;
6129
6130         return (unsigned long)__bpf_skc_lookup(NULL, tuple, len, caller_net,
6131                                                ifindex, IPPROTO_TCP, netns_id,
6132                                                flags);
6133 }
6134
6135 static const struct bpf_func_proto bpf_xdp_skc_lookup_tcp_proto = {
6136         .func           = bpf_xdp_skc_lookup_tcp,
6137         .gpl_only       = false,
6138         .pkt_access     = true,
6139         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6140         .arg1_type      = ARG_PTR_TO_CTX,
6141         .arg2_type      = ARG_PTR_TO_MEM,
6142         .arg3_type      = ARG_CONST_SIZE,
6143         .arg4_type      = ARG_ANYTHING,
6144         .arg5_type      = ARG_ANYTHING,
6145 };
6146
6147 BPF_CALL_5(bpf_xdp_sk_lookup_tcp, struct xdp_buff *, ctx,
6148            struct bpf_sock_tuple *, tuple, u32, len, u32, netns_id, u64, flags)
6149 {
6150         struct net *caller_net = dev_net(ctx->rxq->dev);
6151         int ifindex = ctx->rxq->dev->ifindex;
6152
6153         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len, caller_net,
6154                                               ifindex, IPPROTO_TCP, netns_id,
6155                                               flags);
6156 }
6157
6158 static const struct bpf_func_proto bpf_xdp_sk_lookup_tcp_proto = {
6159         .func           = bpf_xdp_sk_lookup_tcp,
6160         .gpl_only       = false,
6161         .pkt_access     = true,
6162         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6163         .arg1_type      = ARG_PTR_TO_CTX,
6164         .arg2_type      = ARG_PTR_TO_MEM,
6165         .arg3_type      = ARG_CONST_SIZE,
6166         .arg4_type      = ARG_ANYTHING,
6167         .arg5_type      = ARG_ANYTHING,
6168 };
6169
6170 BPF_CALL_5(bpf_sock_addr_skc_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
6171            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6172 {
6173         return (unsigned long)__bpf_skc_lookup(NULL, tuple, len,
6174                                                sock_net(ctx->sk), 0,
6175                                                IPPROTO_TCP, netns_id, flags);
6176 }
6177
6178 static const struct bpf_func_proto bpf_sock_addr_skc_lookup_tcp_proto = {
6179         .func           = bpf_sock_addr_skc_lookup_tcp,
6180         .gpl_only       = false,
6181         .ret_type       = RET_PTR_TO_SOCK_COMMON_OR_NULL,
6182         .arg1_type      = ARG_PTR_TO_CTX,
6183         .arg2_type      = ARG_PTR_TO_MEM,
6184         .arg3_type      = ARG_CONST_SIZE,
6185         .arg4_type      = ARG_ANYTHING,
6186         .arg5_type      = ARG_ANYTHING,
6187 };
6188
6189 BPF_CALL_5(bpf_sock_addr_sk_lookup_tcp, struct bpf_sock_addr_kern *, ctx,
6190            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6191 {
6192         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
6193                                               sock_net(ctx->sk), 0, IPPROTO_TCP,
6194                                               netns_id, flags);
6195 }
6196
6197 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_tcp_proto = {
6198         .func           = bpf_sock_addr_sk_lookup_tcp,
6199         .gpl_only       = false,
6200         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6201         .arg1_type      = ARG_PTR_TO_CTX,
6202         .arg2_type      = ARG_PTR_TO_MEM,
6203         .arg3_type      = ARG_CONST_SIZE,
6204         .arg4_type      = ARG_ANYTHING,
6205         .arg5_type      = ARG_ANYTHING,
6206 };
6207
6208 BPF_CALL_5(bpf_sock_addr_sk_lookup_udp, struct bpf_sock_addr_kern *, ctx,
6209            struct bpf_sock_tuple *, tuple, u32, len, u64, netns_id, u64, flags)
6210 {
6211         return (unsigned long)__bpf_sk_lookup(NULL, tuple, len,
6212                                               sock_net(ctx->sk), 0, IPPROTO_UDP,
6213                                               netns_id, flags);
6214 }
6215
6216 static const struct bpf_func_proto bpf_sock_addr_sk_lookup_udp_proto = {
6217         .func           = bpf_sock_addr_sk_lookup_udp,
6218         .gpl_only       = false,
6219         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6220         .arg1_type      = ARG_PTR_TO_CTX,
6221         .arg2_type      = ARG_PTR_TO_MEM,
6222         .arg3_type      = ARG_CONST_SIZE,
6223         .arg4_type      = ARG_ANYTHING,
6224         .arg5_type      = ARG_ANYTHING,
6225 };
6226
6227 bool bpf_tcp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6228                                   struct bpf_insn_access_aux *info)
6229 {
6230         if (off < 0 || off >= offsetofend(struct bpf_tcp_sock,
6231                                           icsk_retransmits))
6232                 return false;
6233
6234         if (off % size != 0)
6235                 return false;
6236
6237         switch (off) {
6238         case offsetof(struct bpf_tcp_sock, bytes_received):
6239         case offsetof(struct bpf_tcp_sock, bytes_acked):
6240                 return size == sizeof(__u64);
6241         default:
6242                 return size == sizeof(__u32);
6243         }
6244 }
6245
6246 u32 bpf_tcp_sock_convert_ctx_access(enum bpf_access_type type,
6247                                     const struct bpf_insn *si,
6248                                     struct bpf_insn *insn_buf,
6249                                     struct bpf_prog *prog, u32 *target_size)
6250 {
6251         struct bpf_insn *insn = insn_buf;
6252
6253 #define BPF_TCP_SOCK_GET_COMMON(FIELD)                                  \
6254         do {                                                            \
6255                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, FIELD) >     \
6256                              sizeof_field(struct bpf_tcp_sock, FIELD)); \
6257                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_sock, FIELD),\
6258                                       si->dst_reg, si->src_reg,         \
6259                                       offsetof(struct tcp_sock, FIELD)); \
6260         } while (0)
6261
6262 #define BPF_INET_SOCK_GET_COMMON(FIELD)                                 \
6263         do {                                                            \
6264                 BUILD_BUG_ON(sizeof_field(struct inet_connection_sock,  \
6265                                           FIELD) >                      \
6266                              sizeof_field(struct bpf_tcp_sock, FIELD)); \
6267                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                 \
6268                                         struct inet_connection_sock,    \
6269                                         FIELD),                         \
6270                                       si->dst_reg, si->src_reg,         \
6271                                       offsetof(                         \
6272                                         struct inet_connection_sock,    \
6273                                         FIELD));                        \
6274         } while (0)
6275
6276         if (insn > insn_buf)
6277                 return insn - insn_buf;
6278
6279         switch (si->off) {
6280         case offsetof(struct bpf_tcp_sock, rtt_min):
6281                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
6282                              sizeof(struct minmax));
6283                 BUILD_BUG_ON(sizeof(struct minmax) <
6284                              sizeof(struct minmax_sample));
6285
6286                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
6287                                       offsetof(struct tcp_sock, rtt_min) +
6288                                       offsetof(struct minmax_sample, v));
6289                 break;
6290         case offsetof(struct bpf_tcp_sock, snd_cwnd):
6291                 BPF_TCP_SOCK_GET_COMMON(snd_cwnd);
6292                 break;
6293         case offsetof(struct bpf_tcp_sock, srtt_us):
6294                 BPF_TCP_SOCK_GET_COMMON(srtt_us);
6295                 break;
6296         case offsetof(struct bpf_tcp_sock, snd_ssthresh):
6297                 BPF_TCP_SOCK_GET_COMMON(snd_ssthresh);
6298                 break;
6299         case offsetof(struct bpf_tcp_sock, rcv_nxt):
6300                 BPF_TCP_SOCK_GET_COMMON(rcv_nxt);
6301                 break;
6302         case offsetof(struct bpf_tcp_sock, snd_nxt):
6303                 BPF_TCP_SOCK_GET_COMMON(snd_nxt);
6304                 break;
6305         case offsetof(struct bpf_tcp_sock, snd_una):
6306                 BPF_TCP_SOCK_GET_COMMON(snd_una);
6307                 break;
6308         case offsetof(struct bpf_tcp_sock, mss_cache):
6309                 BPF_TCP_SOCK_GET_COMMON(mss_cache);
6310                 break;
6311         case offsetof(struct bpf_tcp_sock, ecn_flags):
6312                 BPF_TCP_SOCK_GET_COMMON(ecn_flags);
6313                 break;
6314         case offsetof(struct bpf_tcp_sock, rate_delivered):
6315                 BPF_TCP_SOCK_GET_COMMON(rate_delivered);
6316                 break;
6317         case offsetof(struct bpf_tcp_sock, rate_interval_us):
6318                 BPF_TCP_SOCK_GET_COMMON(rate_interval_us);
6319                 break;
6320         case offsetof(struct bpf_tcp_sock, packets_out):
6321                 BPF_TCP_SOCK_GET_COMMON(packets_out);
6322                 break;
6323         case offsetof(struct bpf_tcp_sock, retrans_out):
6324                 BPF_TCP_SOCK_GET_COMMON(retrans_out);
6325                 break;
6326         case offsetof(struct bpf_tcp_sock, total_retrans):
6327                 BPF_TCP_SOCK_GET_COMMON(total_retrans);
6328                 break;
6329         case offsetof(struct bpf_tcp_sock, segs_in):
6330                 BPF_TCP_SOCK_GET_COMMON(segs_in);
6331                 break;
6332         case offsetof(struct bpf_tcp_sock, data_segs_in):
6333                 BPF_TCP_SOCK_GET_COMMON(data_segs_in);
6334                 break;
6335         case offsetof(struct bpf_tcp_sock, segs_out):
6336                 BPF_TCP_SOCK_GET_COMMON(segs_out);
6337                 break;
6338         case offsetof(struct bpf_tcp_sock, data_segs_out):
6339                 BPF_TCP_SOCK_GET_COMMON(data_segs_out);
6340                 break;
6341         case offsetof(struct bpf_tcp_sock, lost_out):
6342                 BPF_TCP_SOCK_GET_COMMON(lost_out);
6343                 break;
6344         case offsetof(struct bpf_tcp_sock, sacked_out):
6345                 BPF_TCP_SOCK_GET_COMMON(sacked_out);
6346                 break;
6347         case offsetof(struct bpf_tcp_sock, bytes_received):
6348                 BPF_TCP_SOCK_GET_COMMON(bytes_received);
6349                 break;
6350         case offsetof(struct bpf_tcp_sock, bytes_acked):
6351                 BPF_TCP_SOCK_GET_COMMON(bytes_acked);
6352                 break;
6353         case offsetof(struct bpf_tcp_sock, dsack_dups):
6354                 BPF_TCP_SOCK_GET_COMMON(dsack_dups);
6355                 break;
6356         case offsetof(struct bpf_tcp_sock, delivered):
6357                 BPF_TCP_SOCK_GET_COMMON(delivered);
6358                 break;
6359         case offsetof(struct bpf_tcp_sock, delivered_ce):
6360                 BPF_TCP_SOCK_GET_COMMON(delivered_ce);
6361                 break;
6362         case offsetof(struct bpf_tcp_sock, icsk_retransmits):
6363                 BPF_INET_SOCK_GET_COMMON(icsk_retransmits);
6364                 break;
6365         }
6366
6367         return insn - insn_buf;
6368 }
6369
6370 BPF_CALL_1(bpf_tcp_sock, struct sock *, sk)
6371 {
6372         if (sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
6373                 return (unsigned long)sk;
6374
6375         return (unsigned long)NULL;
6376 }
6377
6378 const struct bpf_func_proto bpf_tcp_sock_proto = {
6379         .func           = bpf_tcp_sock,
6380         .gpl_only       = false,
6381         .ret_type       = RET_PTR_TO_TCP_SOCK_OR_NULL,
6382         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
6383 };
6384
6385 BPF_CALL_1(bpf_get_listener_sock, struct sock *, sk)
6386 {
6387         sk = sk_to_full_sk(sk);
6388
6389         if (sk->sk_state == TCP_LISTEN && sock_flag(sk, SOCK_RCU_FREE))
6390                 return (unsigned long)sk;
6391
6392         return (unsigned long)NULL;
6393 }
6394
6395 static const struct bpf_func_proto bpf_get_listener_sock_proto = {
6396         .func           = bpf_get_listener_sock,
6397         .gpl_only       = false,
6398         .ret_type       = RET_PTR_TO_SOCKET_OR_NULL,
6399         .arg1_type      = ARG_PTR_TO_SOCK_COMMON,
6400 };
6401
6402 BPF_CALL_1(bpf_skb_ecn_set_ce, struct sk_buff *, skb)
6403 {
6404         unsigned int iphdr_len;
6405
6406         switch (skb_protocol(skb, true)) {
6407         case cpu_to_be16(ETH_P_IP):
6408                 iphdr_len = sizeof(struct iphdr);
6409                 break;
6410         case cpu_to_be16(ETH_P_IPV6):
6411                 iphdr_len = sizeof(struct ipv6hdr);
6412                 break;
6413         default:
6414                 return 0;
6415         }
6416
6417         if (skb_headlen(skb) < iphdr_len)
6418                 return 0;
6419
6420         if (skb_cloned(skb) && !skb_clone_writable(skb, iphdr_len))
6421                 return 0;
6422
6423         return INET_ECN_set_ce(skb);
6424 }
6425
6426 bool bpf_xdp_sock_is_valid_access(int off, int size, enum bpf_access_type type,
6427                                   struct bpf_insn_access_aux *info)
6428 {
6429         if (off < 0 || off >= offsetofend(struct bpf_xdp_sock, queue_id))
6430                 return false;
6431
6432         if (off % size != 0)
6433                 return false;
6434
6435         switch (off) {
6436         default:
6437                 return size == sizeof(__u32);
6438         }
6439 }
6440
6441 u32 bpf_xdp_sock_convert_ctx_access(enum bpf_access_type type,
6442                                     const struct bpf_insn *si,
6443                                     struct bpf_insn *insn_buf,
6444                                     struct bpf_prog *prog, u32 *target_size)
6445 {
6446         struct bpf_insn *insn = insn_buf;
6447
6448 #define BPF_XDP_SOCK_GET(FIELD)                                         \
6449         do {                                                            \
6450                 BUILD_BUG_ON(sizeof_field(struct xdp_sock, FIELD) >     \
6451                              sizeof_field(struct bpf_xdp_sock, FIELD)); \
6452                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_sock, FIELD),\
6453                                       si->dst_reg, si->src_reg,         \
6454                                       offsetof(struct xdp_sock, FIELD)); \
6455         } while (0)
6456
6457         switch (si->off) {
6458         case offsetof(struct bpf_xdp_sock, queue_id):
6459                 BPF_XDP_SOCK_GET(queue_id);
6460                 break;
6461         }
6462
6463         return insn - insn_buf;
6464 }
6465
6466 static const struct bpf_func_proto bpf_skb_ecn_set_ce_proto = {
6467         .func           = bpf_skb_ecn_set_ce,
6468         .gpl_only       = false,
6469         .ret_type       = RET_INTEGER,
6470         .arg1_type      = ARG_PTR_TO_CTX,
6471 };
6472
6473 BPF_CALL_5(bpf_tcp_check_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
6474            struct tcphdr *, th, u32, th_len)
6475 {
6476 #ifdef CONFIG_SYN_COOKIES
6477         u32 cookie;
6478         int ret;
6479
6480         if (unlikely(!sk || th_len < sizeof(*th)))
6481                 return -EINVAL;
6482
6483         /* sk_listener() allows TCP_NEW_SYN_RECV, which makes no sense here. */
6484         if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
6485                 return -EINVAL;
6486
6487         if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies)
6488                 return -EINVAL;
6489
6490         if (!th->ack || th->rst || th->syn)
6491                 return -ENOENT;
6492
6493         if (tcp_synq_no_recent_overflow(sk))
6494                 return -ENOENT;
6495
6496         cookie = ntohl(th->ack_seq) - 1;
6497
6498         switch (sk->sk_family) {
6499         case AF_INET:
6500                 if (unlikely(iph_len < sizeof(struct iphdr)))
6501                         return -EINVAL;
6502
6503                 ret = __cookie_v4_check((struct iphdr *)iph, th, cookie);
6504                 break;
6505
6506 #if IS_BUILTIN(CONFIG_IPV6)
6507         case AF_INET6:
6508                 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
6509                         return -EINVAL;
6510
6511                 ret = __cookie_v6_check((struct ipv6hdr *)iph, th, cookie);
6512                 break;
6513 #endif /* CONFIG_IPV6 */
6514
6515         default:
6516                 return -EPROTONOSUPPORT;
6517         }
6518
6519         if (ret > 0)
6520                 return 0;
6521
6522         return -ENOENT;
6523 #else
6524         return -ENOTSUPP;
6525 #endif
6526 }
6527
6528 static const struct bpf_func_proto bpf_tcp_check_syncookie_proto = {
6529         .func           = bpf_tcp_check_syncookie,
6530         .gpl_only       = true,
6531         .pkt_access     = true,
6532         .ret_type       = RET_INTEGER,
6533         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6534         .arg2_type      = ARG_PTR_TO_MEM,
6535         .arg3_type      = ARG_CONST_SIZE,
6536         .arg4_type      = ARG_PTR_TO_MEM,
6537         .arg5_type      = ARG_CONST_SIZE,
6538 };
6539
6540 BPF_CALL_5(bpf_tcp_gen_syncookie, struct sock *, sk, void *, iph, u32, iph_len,
6541            struct tcphdr *, th, u32, th_len)
6542 {
6543 #ifdef CONFIG_SYN_COOKIES
6544         u32 cookie;
6545         u16 mss;
6546
6547         if (unlikely(!sk || th_len < sizeof(*th) || th_len != th->doff * 4))
6548                 return -EINVAL;
6549
6550         if (sk->sk_protocol != IPPROTO_TCP || sk->sk_state != TCP_LISTEN)
6551                 return -EINVAL;
6552
6553         if (!sock_net(sk)->ipv4.sysctl_tcp_syncookies)
6554                 return -ENOENT;
6555
6556         if (!th->syn || th->ack || th->fin || th->rst)
6557                 return -EINVAL;
6558
6559         if (unlikely(iph_len < sizeof(struct iphdr)))
6560                 return -EINVAL;
6561
6562         /* Both struct iphdr and struct ipv6hdr have the version field at the
6563          * same offset so we can cast to the shorter header (struct iphdr).
6564          */
6565         switch (((struct iphdr *)iph)->version) {
6566         case 4:
6567                 if (sk->sk_family == AF_INET6 && sk->sk_ipv6only)
6568                         return -EINVAL;
6569
6570                 mss = tcp_v4_get_syncookie(sk, iph, th, &cookie);
6571                 break;
6572
6573 #if IS_BUILTIN(CONFIG_IPV6)
6574         case 6:
6575                 if (unlikely(iph_len < sizeof(struct ipv6hdr)))
6576                         return -EINVAL;
6577
6578                 if (sk->sk_family != AF_INET6)
6579                         return -EINVAL;
6580
6581                 mss = tcp_v6_get_syncookie(sk, iph, th, &cookie);
6582                 break;
6583 #endif /* CONFIG_IPV6 */
6584
6585         default:
6586                 return -EPROTONOSUPPORT;
6587         }
6588         if (mss == 0)
6589                 return -ENOENT;
6590
6591         return cookie | ((u64)mss << 32);
6592 #else
6593         return -EOPNOTSUPP;
6594 #endif /* CONFIG_SYN_COOKIES */
6595 }
6596
6597 static const struct bpf_func_proto bpf_tcp_gen_syncookie_proto = {
6598         .func           = bpf_tcp_gen_syncookie,
6599         .gpl_only       = true, /* __cookie_v*_init_sequence() is GPL */
6600         .pkt_access     = true,
6601         .ret_type       = RET_INTEGER,
6602         .arg1_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6603         .arg2_type      = ARG_PTR_TO_MEM,
6604         .arg3_type      = ARG_CONST_SIZE,
6605         .arg4_type      = ARG_PTR_TO_MEM,
6606         .arg5_type      = ARG_CONST_SIZE,
6607 };
6608
6609 BPF_CALL_3(bpf_sk_assign, struct sk_buff *, skb, struct sock *, sk, u64, flags)
6610 {
6611         if (!sk || flags != 0)
6612                 return -EINVAL;
6613         if (!skb_at_tc_ingress(skb))
6614                 return -EOPNOTSUPP;
6615         if (unlikely(dev_net(skb->dev) != sock_net(sk)))
6616                 return -ENETUNREACH;
6617         if (unlikely(sk_fullsock(sk) && sk->sk_reuseport))
6618                 return -ESOCKTNOSUPPORT;
6619         if (sk_is_refcounted(sk) &&
6620             unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
6621                 return -ENOENT;
6622
6623         skb_orphan(skb);
6624         skb->sk = sk;
6625         skb->destructor = sock_pfree;
6626
6627         return 0;
6628 }
6629
6630 static const struct bpf_func_proto bpf_sk_assign_proto = {
6631         .func           = bpf_sk_assign,
6632         .gpl_only       = false,
6633         .ret_type       = RET_INTEGER,
6634         .arg1_type      = ARG_PTR_TO_CTX,
6635         .arg2_type      = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
6636         .arg3_type      = ARG_ANYTHING,
6637 };
6638
6639 static const u8 *bpf_search_tcp_opt(const u8 *op, const u8 *opend,
6640                                     u8 search_kind, const u8 *magic,
6641                                     u8 magic_len, bool *eol)
6642 {
6643         u8 kind, kind_len;
6644
6645         *eol = false;
6646
6647         while (op < opend) {
6648                 kind = op[0];
6649
6650                 if (kind == TCPOPT_EOL) {
6651                         *eol = true;
6652                         return ERR_PTR(-ENOMSG);
6653                 } else if (kind == TCPOPT_NOP) {
6654                         op++;
6655                         continue;
6656                 }
6657
6658                 if (opend - op < 2 || opend - op < op[1] || op[1] < 2)
6659                         /* Something is wrong in the received header.
6660                          * Follow the TCP stack's tcp_parse_options()
6661                          * and just bail here.
6662                          */
6663                         return ERR_PTR(-EFAULT);
6664
6665                 kind_len = op[1];
6666                 if (search_kind == kind) {
6667                         if (!magic_len)
6668                                 return op;
6669
6670                         if (magic_len > kind_len - 2)
6671                                 return ERR_PTR(-ENOMSG);
6672
6673                         if (!memcmp(&op[2], magic, magic_len))
6674                                 return op;
6675                 }
6676
6677                 op += kind_len;
6678         }
6679
6680         return ERR_PTR(-ENOMSG);
6681 }
6682
6683 BPF_CALL_4(bpf_sock_ops_load_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
6684            void *, search_res, u32, len, u64, flags)
6685 {
6686         bool eol, load_syn = flags & BPF_LOAD_HDR_OPT_TCP_SYN;
6687         const u8 *op, *opend, *magic, *search = search_res;
6688         u8 search_kind, search_len, copy_len, magic_len;
6689         int ret;
6690
6691         /* 2 byte is the minimal option len except TCPOPT_NOP and
6692          * TCPOPT_EOL which are useless for the bpf prog to learn
6693          * and this helper disallow loading them also.
6694          */
6695         if (len < 2 || flags & ~BPF_LOAD_HDR_OPT_TCP_SYN)
6696                 return -EINVAL;
6697
6698         search_kind = search[0];
6699         search_len = search[1];
6700
6701         if (search_len > len || search_kind == TCPOPT_NOP ||
6702             search_kind == TCPOPT_EOL)
6703                 return -EINVAL;
6704
6705         if (search_kind == TCPOPT_EXP || search_kind == 253) {
6706                 /* 16 or 32 bit magic.  +2 for kind and kind length */
6707                 if (search_len != 4 && search_len != 6)
6708                         return -EINVAL;
6709                 magic = &search[2];
6710                 magic_len = search_len - 2;
6711         } else {
6712                 if (search_len)
6713                         return -EINVAL;
6714                 magic = NULL;
6715                 magic_len = 0;
6716         }
6717
6718         if (load_syn) {
6719                 ret = bpf_sock_ops_get_syn(bpf_sock, TCP_BPF_SYN, &op);
6720                 if (ret < 0)
6721                         return ret;
6722
6723                 opend = op + ret;
6724                 op += sizeof(struct tcphdr);
6725         } else {
6726                 if (!bpf_sock->skb ||
6727                     bpf_sock->op == BPF_SOCK_OPS_HDR_OPT_LEN_CB)
6728                         /* This bpf_sock->op cannot call this helper */
6729                         return -EPERM;
6730
6731                 opend = bpf_sock->skb_data_end;
6732                 op = bpf_sock->skb->data + sizeof(struct tcphdr);
6733         }
6734
6735         op = bpf_search_tcp_opt(op, opend, search_kind, magic, magic_len,
6736                                 &eol);
6737         if (IS_ERR(op))
6738                 return PTR_ERR(op);
6739
6740         copy_len = op[1];
6741         ret = copy_len;
6742         if (copy_len > len) {
6743                 ret = -ENOSPC;
6744                 copy_len = len;
6745         }
6746
6747         memcpy(search_res, op, copy_len);
6748         return ret;
6749 }
6750
6751 static const struct bpf_func_proto bpf_sock_ops_load_hdr_opt_proto = {
6752         .func           = bpf_sock_ops_load_hdr_opt,
6753         .gpl_only       = false,
6754         .ret_type       = RET_INTEGER,
6755         .arg1_type      = ARG_PTR_TO_CTX,
6756         .arg2_type      = ARG_PTR_TO_MEM,
6757         .arg3_type      = ARG_CONST_SIZE,
6758         .arg4_type      = ARG_ANYTHING,
6759 };
6760
6761 BPF_CALL_4(bpf_sock_ops_store_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
6762            const void *, from, u32, len, u64, flags)
6763 {
6764         u8 new_kind, new_kind_len, magic_len = 0, *opend;
6765         const u8 *op, *new_op, *magic = NULL;
6766         struct sk_buff *skb;
6767         bool eol;
6768
6769         if (bpf_sock->op != BPF_SOCK_OPS_WRITE_HDR_OPT_CB)
6770                 return -EPERM;
6771
6772         if (len < 2 || flags)
6773                 return -EINVAL;
6774
6775         new_op = from;
6776         new_kind = new_op[0];
6777         new_kind_len = new_op[1];
6778
6779         if (new_kind_len > len || new_kind == TCPOPT_NOP ||
6780             new_kind == TCPOPT_EOL)
6781                 return -EINVAL;
6782
6783         if (new_kind_len > bpf_sock->remaining_opt_len)
6784                 return -ENOSPC;
6785
6786         /* 253 is another experimental kind */
6787         if (new_kind == TCPOPT_EXP || new_kind == 253)  {
6788                 if (new_kind_len < 4)
6789                         return -EINVAL;
6790                 /* Match for the 2 byte magic also.
6791                  * RFC 6994: the magic could be 2 or 4 bytes.
6792                  * Hence, matching by 2 byte only is on the
6793                  * conservative side but it is the right
6794                  * thing to do for the 'search-for-duplication'
6795                  * purpose.
6796                  */
6797                 magic = &new_op[2];
6798                 magic_len = 2;
6799         }
6800
6801         /* Check for duplication */
6802         skb = bpf_sock->skb;
6803         op = skb->data + sizeof(struct tcphdr);
6804         opend = bpf_sock->skb_data_end;
6805
6806         op = bpf_search_tcp_opt(op, opend, new_kind, magic, magic_len,
6807                                 &eol);
6808         if (!IS_ERR(op))
6809                 return -EEXIST;
6810
6811         if (PTR_ERR(op) != -ENOMSG)
6812                 return PTR_ERR(op);
6813
6814         if (eol)
6815                 /* The option has been ended.  Treat it as no more
6816                  * header option can be written.
6817                  */
6818                 return -ENOSPC;
6819
6820         /* No duplication found.  Store the header option. */
6821         memcpy(opend, from, new_kind_len);
6822
6823         bpf_sock->remaining_opt_len -= new_kind_len;
6824         bpf_sock->skb_data_end += new_kind_len;
6825
6826         return 0;
6827 }
6828
6829 static const struct bpf_func_proto bpf_sock_ops_store_hdr_opt_proto = {
6830         .func           = bpf_sock_ops_store_hdr_opt,
6831         .gpl_only       = false,
6832         .ret_type       = RET_INTEGER,
6833         .arg1_type      = ARG_PTR_TO_CTX,
6834         .arg2_type      = ARG_PTR_TO_MEM,
6835         .arg3_type      = ARG_CONST_SIZE,
6836         .arg4_type      = ARG_ANYTHING,
6837 };
6838
6839 BPF_CALL_3(bpf_sock_ops_reserve_hdr_opt, struct bpf_sock_ops_kern *, bpf_sock,
6840            u32, len, u64, flags)
6841 {
6842         if (bpf_sock->op != BPF_SOCK_OPS_HDR_OPT_LEN_CB)
6843                 return -EPERM;
6844
6845         if (flags || len < 2)
6846                 return -EINVAL;
6847
6848         if (len > bpf_sock->remaining_opt_len)
6849                 return -ENOSPC;
6850
6851         bpf_sock->remaining_opt_len -= len;
6852
6853         return 0;
6854 }
6855
6856 static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = {
6857         .func           = bpf_sock_ops_reserve_hdr_opt,
6858         .gpl_only       = false,
6859         .ret_type       = RET_INTEGER,
6860         .arg1_type      = ARG_PTR_TO_CTX,
6861         .arg2_type      = ARG_ANYTHING,
6862         .arg3_type      = ARG_ANYTHING,
6863 };
6864
6865 #endif /* CONFIG_INET */
6866
6867 bool bpf_helper_changes_pkt_data(void *func)
6868 {
6869         if (func == bpf_skb_vlan_push ||
6870             func == bpf_skb_vlan_pop ||
6871             func == bpf_skb_store_bytes ||
6872             func == bpf_skb_change_proto ||
6873             func == bpf_skb_change_head ||
6874             func == sk_skb_change_head ||
6875             func == bpf_skb_change_tail ||
6876             func == sk_skb_change_tail ||
6877             func == bpf_skb_adjust_room ||
6878             func == sk_skb_adjust_room ||
6879             func == bpf_skb_pull_data ||
6880             func == sk_skb_pull_data ||
6881             func == bpf_clone_redirect ||
6882             func == bpf_l3_csum_replace ||
6883             func == bpf_l4_csum_replace ||
6884             func == bpf_xdp_adjust_head ||
6885             func == bpf_xdp_adjust_meta ||
6886             func == bpf_msg_pull_data ||
6887             func == bpf_msg_push_data ||
6888             func == bpf_msg_pop_data ||
6889             func == bpf_xdp_adjust_tail ||
6890 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
6891             func == bpf_lwt_seg6_store_bytes ||
6892             func == bpf_lwt_seg6_adjust_srh ||
6893             func == bpf_lwt_seg6_action ||
6894 #endif
6895 #ifdef CONFIG_INET
6896             func == bpf_sock_ops_store_hdr_opt ||
6897 #endif
6898             func == bpf_lwt_in_push_encap ||
6899             func == bpf_lwt_xmit_push_encap)
6900                 return true;
6901
6902         return false;
6903 }
6904
6905 const struct bpf_func_proto bpf_event_output_data_proto __weak;
6906 const struct bpf_func_proto bpf_sk_storage_get_cg_sock_proto __weak;
6907
6908 static const struct bpf_func_proto *
6909 sock_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6910 {
6911         switch (func_id) {
6912         /* inet and inet6 sockets are created in a process
6913          * context so there is always a valid uid/gid
6914          */
6915         case BPF_FUNC_get_current_uid_gid:
6916                 return &bpf_get_current_uid_gid_proto;
6917         case BPF_FUNC_get_local_storage:
6918                 return &bpf_get_local_storage_proto;
6919         case BPF_FUNC_get_socket_cookie:
6920                 return &bpf_get_socket_cookie_sock_proto;
6921         case BPF_FUNC_get_netns_cookie:
6922                 return &bpf_get_netns_cookie_sock_proto;
6923         case BPF_FUNC_perf_event_output:
6924                 return &bpf_event_output_data_proto;
6925         case BPF_FUNC_get_current_pid_tgid:
6926                 return &bpf_get_current_pid_tgid_proto;
6927         case BPF_FUNC_get_current_comm:
6928                 return &bpf_get_current_comm_proto;
6929 #ifdef CONFIG_CGROUPS
6930         case BPF_FUNC_get_current_cgroup_id:
6931                 return &bpf_get_current_cgroup_id_proto;
6932         case BPF_FUNC_get_current_ancestor_cgroup_id:
6933                 return &bpf_get_current_ancestor_cgroup_id_proto;
6934 #endif
6935 #ifdef CONFIG_CGROUP_NET_CLASSID
6936         case BPF_FUNC_get_cgroup_classid:
6937                 return &bpf_get_cgroup_classid_curr_proto;
6938 #endif
6939         case BPF_FUNC_sk_storage_get:
6940                 return &bpf_sk_storage_get_cg_sock_proto;
6941         default:
6942                 return bpf_base_func_proto(func_id);
6943         }
6944 }
6945
6946 static const struct bpf_func_proto *
6947 sock_addr_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
6948 {
6949         switch (func_id) {
6950         /* inet and inet6 sockets are created in a process
6951          * context so there is always a valid uid/gid
6952          */
6953         case BPF_FUNC_get_current_uid_gid:
6954                 return &bpf_get_current_uid_gid_proto;
6955         case BPF_FUNC_bind:
6956                 switch (prog->expected_attach_type) {
6957                 case BPF_CGROUP_INET4_CONNECT:
6958                 case BPF_CGROUP_INET6_CONNECT:
6959                         return &bpf_bind_proto;
6960                 default:
6961                         return NULL;
6962                 }
6963         case BPF_FUNC_get_socket_cookie:
6964                 return &bpf_get_socket_cookie_sock_addr_proto;
6965         case BPF_FUNC_get_netns_cookie:
6966                 return &bpf_get_netns_cookie_sock_addr_proto;
6967         case BPF_FUNC_get_local_storage:
6968                 return &bpf_get_local_storage_proto;
6969         case BPF_FUNC_perf_event_output:
6970                 return &bpf_event_output_data_proto;
6971         case BPF_FUNC_get_current_pid_tgid:
6972                 return &bpf_get_current_pid_tgid_proto;
6973         case BPF_FUNC_get_current_comm:
6974                 return &bpf_get_current_comm_proto;
6975 #ifdef CONFIG_CGROUPS
6976         case BPF_FUNC_get_current_cgroup_id:
6977                 return &bpf_get_current_cgroup_id_proto;
6978         case BPF_FUNC_get_current_ancestor_cgroup_id:
6979                 return &bpf_get_current_ancestor_cgroup_id_proto;
6980 #endif
6981 #ifdef CONFIG_CGROUP_NET_CLASSID
6982         case BPF_FUNC_get_cgroup_classid:
6983                 return &bpf_get_cgroup_classid_curr_proto;
6984 #endif
6985 #ifdef CONFIG_INET
6986         case BPF_FUNC_sk_lookup_tcp:
6987                 return &bpf_sock_addr_sk_lookup_tcp_proto;
6988         case BPF_FUNC_sk_lookup_udp:
6989                 return &bpf_sock_addr_sk_lookup_udp_proto;
6990         case BPF_FUNC_sk_release:
6991                 return &bpf_sk_release_proto;
6992         case BPF_FUNC_skc_lookup_tcp:
6993                 return &bpf_sock_addr_skc_lookup_tcp_proto;
6994 #endif /* CONFIG_INET */
6995         case BPF_FUNC_sk_storage_get:
6996                 return &bpf_sk_storage_get_proto;
6997         case BPF_FUNC_sk_storage_delete:
6998                 return &bpf_sk_storage_delete_proto;
6999         case BPF_FUNC_setsockopt:
7000                 switch (prog->expected_attach_type) {
7001                 case BPF_CGROUP_INET4_BIND:
7002                 case BPF_CGROUP_INET6_BIND:
7003                 case BPF_CGROUP_INET4_CONNECT:
7004                 case BPF_CGROUP_INET6_CONNECT:
7005                         return &bpf_sock_addr_setsockopt_proto;
7006                 default:
7007                         return NULL;
7008                 }
7009         case BPF_FUNC_getsockopt:
7010                 switch (prog->expected_attach_type) {
7011                 case BPF_CGROUP_INET4_BIND:
7012                 case BPF_CGROUP_INET6_BIND:
7013                 case BPF_CGROUP_INET4_CONNECT:
7014                 case BPF_CGROUP_INET6_CONNECT:
7015                         return &bpf_sock_addr_getsockopt_proto;
7016                 default:
7017                         return NULL;
7018                 }
7019         default:
7020                 return bpf_sk_base_func_proto(func_id);
7021         }
7022 }
7023
7024 static const struct bpf_func_proto *
7025 sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7026 {
7027         switch (func_id) {
7028         case BPF_FUNC_skb_load_bytes:
7029                 return &bpf_skb_load_bytes_proto;
7030         case BPF_FUNC_skb_load_bytes_relative:
7031                 return &bpf_skb_load_bytes_relative_proto;
7032         case BPF_FUNC_get_socket_cookie:
7033                 return &bpf_get_socket_cookie_proto;
7034         case BPF_FUNC_get_socket_uid:
7035                 return &bpf_get_socket_uid_proto;
7036         case BPF_FUNC_perf_event_output:
7037                 return &bpf_skb_event_output_proto;
7038         default:
7039                 return bpf_sk_base_func_proto(func_id);
7040         }
7041 }
7042
7043 const struct bpf_func_proto bpf_sk_storage_get_proto __weak;
7044 const struct bpf_func_proto bpf_sk_storage_delete_proto __weak;
7045
7046 static const struct bpf_func_proto *
7047 cg_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7048 {
7049         switch (func_id) {
7050         case BPF_FUNC_get_local_storage:
7051                 return &bpf_get_local_storage_proto;
7052         case BPF_FUNC_sk_fullsock:
7053                 return &bpf_sk_fullsock_proto;
7054         case BPF_FUNC_sk_storage_get:
7055                 return &bpf_sk_storage_get_proto;
7056         case BPF_FUNC_sk_storage_delete:
7057                 return &bpf_sk_storage_delete_proto;
7058         case BPF_FUNC_perf_event_output:
7059                 return &bpf_skb_event_output_proto;
7060 #ifdef CONFIG_SOCK_CGROUP_DATA
7061         case BPF_FUNC_skb_cgroup_id:
7062                 return &bpf_skb_cgroup_id_proto;
7063         case BPF_FUNC_skb_ancestor_cgroup_id:
7064                 return &bpf_skb_ancestor_cgroup_id_proto;
7065         case BPF_FUNC_sk_cgroup_id:
7066                 return &bpf_sk_cgroup_id_proto;
7067         case BPF_FUNC_sk_ancestor_cgroup_id:
7068                 return &bpf_sk_ancestor_cgroup_id_proto;
7069 #endif
7070 #ifdef CONFIG_INET
7071         case BPF_FUNC_sk_lookup_tcp:
7072                 return &bpf_sk_lookup_tcp_proto;
7073         case BPF_FUNC_sk_lookup_udp:
7074                 return &bpf_sk_lookup_udp_proto;
7075         case BPF_FUNC_sk_release:
7076                 return &bpf_sk_release_proto;
7077         case BPF_FUNC_skc_lookup_tcp:
7078                 return &bpf_skc_lookup_tcp_proto;
7079         case BPF_FUNC_tcp_sock:
7080                 return &bpf_tcp_sock_proto;
7081         case BPF_FUNC_get_listener_sock:
7082                 return &bpf_get_listener_sock_proto;
7083         case BPF_FUNC_skb_ecn_set_ce:
7084                 return &bpf_skb_ecn_set_ce_proto;
7085 #endif
7086         default:
7087                 return sk_filter_func_proto(func_id, prog);
7088         }
7089 }
7090
7091 static const struct bpf_func_proto *
7092 tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7093 {
7094         switch (func_id) {
7095         case BPF_FUNC_skb_store_bytes:
7096                 return &bpf_skb_store_bytes_proto;
7097         case BPF_FUNC_skb_load_bytes:
7098                 return &bpf_skb_load_bytes_proto;
7099         case BPF_FUNC_skb_load_bytes_relative:
7100                 return &bpf_skb_load_bytes_relative_proto;
7101         case BPF_FUNC_skb_pull_data:
7102                 return &bpf_skb_pull_data_proto;
7103         case BPF_FUNC_csum_diff:
7104                 return &bpf_csum_diff_proto;
7105         case BPF_FUNC_csum_update:
7106                 return &bpf_csum_update_proto;
7107         case BPF_FUNC_csum_level:
7108                 return &bpf_csum_level_proto;
7109         case BPF_FUNC_l3_csum_replace:
7110                 return &bpf_l3_csum_replace_proto;
7111         case BPF_FUNC_l4_csum_replace:
7112                 return &bpf_l4_csum_replace_proto;
7113         case BPF_FUNC_clone_redirect:
7114                 return &bpf_clone_redirect_proto;
7115         case BPF_FUNC_get_cgroup_classid:
7116                 return &bpf_get_cgroup_classid_proto;
7117         case BPF_FUNC_skb_vlan_push:
7118                 return &bpf_skb_vlan_push_proto;
7119         case BPF_FUNC_skb_vlan_pop:
7120                 return &bpf_skb_vlan_pop_proto;
7121         case BPF_FUNC_skb_change_proto:
7122                 return &bpf_skb_change_proto_proto;
7123         case BPF_FUNC_skb_change_type:
7124                 return &bpf_skb_change_type_proto;
7125         case BPF_FUNC_skb_adjust_room:
7126                 return &bpf_skb_adjust_room_proto;
7127         case BPF_FUNC_skb_change_tail:
7128                 return &bpf_skb_change_tail_proto;
7129         case BPF_FUNC_skb_change_head:
7130                 return &bpf_skb_change_head_proto;
7131         case BPF_FUNC_skb_get_tunnel_key:
7132                 return &bpf_skb_get_tunnel_key_proto;
7133         case BPF_FUNC_skb_set_tunnel_key:
7134                 return bpf_get_skb_set_tunnel_proto(func_id);
7135         case BPF_FUNC_skb_get_tunnel_opt:
7136                 return &bpf_skb_get_tunnel_opt_proto;
7137         case BPF_FUNC_skb_set_tunnel_opt:
7138                 return bpf_get_skb_set_tunnel_proto(func_id);
7139         case BPF_FUNC_redirect:
7140                 return &bpf_redirect_proto;
7141         case BPF_FUNC_redirect_neigh:
7142                 return &bpf_redirect_neigh_proto;
7143         case BPF_FUNC_redirect_peer:
7144                 return &bpf_redirect_peer_proto;
7145         case BPF_FUNC_get_route_realm:
7146                 return &bpf_get_route_realm_proto;
7147         case BPF_FUNC_get_hash_recalc:
7148                 return &bpf_get_hash_recalc_proto;
7149         case BPF_FUNC_set_hash_invalid:
7150                 return &bpf_set_hash_invalid_proto;
7151         case BPF_FUNC_set_hash:
7152                 return &bpf_set_hash_proto;
7153         case BPF_FUNC_perf_event_output:
7154                 return &bpf_skb_event_output_proto;
7155         case BPF_FUNC_get_smp_processor_id:
7156                 return &bpf_get_smp_processor_id_proto;
7157         case BPF_FUNC_skb_under_cgroup:
7158                 return &bpf_skb_under_cgroup_proto;
7159         case BPF_FUNC_get_socket_cookie:
7160                 return &bpf_get_socket_cookie_proto;
7161         case BPF_FUNC_get_socket_uid:
7162                 return &bpf_get_socket_uid_proto;
7163         case BPF_FUNC_fib_lookup:
7164                 return &bpf_skb_fib_lookup_proto;
7165         case BPF_FUNC_sk_fullsock:
7166                 return &bpf_sk_fullsock_proto;
7167         case BPF_FUNC_sk_storage_get:
7168                 return &bpf_sk_storage_get_proto;
7169         case BPF_FUNC_sk_storage_delete:
7170                 return &bpf_sk_storage_delete_proto;
7171 #ifdef CONFIG_XFRM
7172         case BPF_FUNC_skb_get_xfrm_state:
7173                 return &bpf_skb_get_xfrm_state_proto;
7174 #endif
7175 #ifdef CONFIG_CGROUP_NET_CLASSID
7176         case BPF_FUNC_skb_cgroup_classid:
7177                 return &bpf_skb_cgroup_classid_proto;
7178 #endif
7179 #ifdef CONFIG_SOCK_CGROUP_DATA
7180         case BPF_FUNC_skb_cgroup_id:
7181                 return &bpf_skb_cgroup_id_proto;
7182         case BPF_FUNC_skb_ancestor_cgroup_id:
7183                 return &bpf_skb_ancestor_cgroup_id_proto;
7184 #endif
7185 #ifdef CONFIG_INET
7186         case BPF_FUNC_sk_lookup_tcp:
7187                 return &bpf_sk_lookup_tcp_proto;
7188         case BPF_FUNC_sk_lookup_udp:
7189                 return &bpf_sk_lookup_udp_proto;
7190         case BPF_FUNC_sk_release:
7191                 return &bpf_sk_release_proto;
7192         case BPF_FUNC_tcp_sock:
7193                 return &bpf_tcp_sock_proto;
7194         case BPF_FUNC_get_listener_sock:
7195                 return &bpf_get_listener_sock_proto;
7196         case BPF_FUNC_skc_lookup_tcp:
7197                 return &bpf_skc_lookup_tcp_proto;
7198         case BPF_FUNC_tcp_check_syncookie:
7199                 return &bpf_tcp_check_syncookie_proto;
7200         case BPF_FUNC_skb_ecn_set_ce:
7201                 return &bpf_skb_ecn_set_ce_proto;
7202         case BPF_FUNC_tcp_gen_syncookie:
7203                 return &bpf_tcp_gen_syncookie_proto;
7204         case BPF_FUNC_sk_assign:
7205                 return &bpf_sk_assign_proto;
7206 #endif
7207         default:
7208                 return bpf_sk_base_func_proto(func_id);
7209         }
7210 }
7211
7212 static const struct bpf_func_proto *
7213 xdp_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7214 {
7215         switch (func_id) {
7216         case BPF_FUNC_perf_event_output:
7217                 return &bpf_xdp_event_output_proto;
7218         case BPF_FUNC_get_smp_processor_id:
7219                 return &bpf_get_smp_processor_id_proto;
7220         case BPF_FUNC_csum_diff:
7221                 return &bpf_csum_diff_proto;
7222         case BPF_FUNC_xdp_adjust_head:
7223                 return &bpf_xdp_adjust_head_proto;
7224         case BPF_FUNC_xdp_adjust_meta:
7225                 return &bpf_xdp_adjust_meta_proto;
7226         case BPF_FUNC_redirect:
7227                 return &bpf_xdp_redirect_proto;
7228         case BPF_FUNC_redirect_map:
7229                 return &bpf_xdp_redirect_map_proto;
7230         case BPF_FUNC_xdp_adjust_tail:
7231                 return &bpf_xdp_adjust_tail_proto;
7232         case BPF_FUNC_fib_lookup:
7233                 return &bpf_xdp_fib_lookup_proto;
7234 #ifdef CONFIG_INET
7235         case BPF_FUNC_sk_lookup_udp:
7236                 return &bpf_xdp_sk_lookup_udp_proto;
7237         case BPF_FUNC_sk_lookup_tcp:
7238                 return &bpf_xdp_sk_lookup_tcp_proto;
7239         case BPF_FUNC_sk_release:
7240                 return &bpf_sk_release_proto;
7241         case BPF_FUNC_skc_lookup_tcp:
7242                 return &bpf_xdp_skc_lookup_tcp_proto;
7243         case BPF_FUNC_tcp_check_syncookie:
7244                 return &bpf_tcp_check_syncookie_proto;
7245         case BPF_FUNC_tcp_gen_syncookie:
7246                 return &bpf_tcp_gen_syncookie_proto;
7247 #endif
7248         default:
7249                 return bpf_sk_base_func_proto(func_id);
7250         }
7251 }
7252
7253 const struct bpf_func_proto bpf_sock_map_update_proto __weak;
7254 const struct bpf_func_proto bpf_sock_hash_update_proto __weak;
7255
7256 static const struct bpf_func_proto *
7257 sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7258 {
7259         switch (func_id) {
7260         case BPF_FUNC_setsockopt:
7261                 return &bpf_sock_ops_setsockopt_proto;
7262         case BPF_FUNC_getsockopt:
7263                 return &bpf_sock_ops_getsockopt_proto;
7264         case BPF_FUNC_sock_ops_cb_flags_set:
7265                 return &bpf_sock_ops_cb_flags_set_proto;
7266         case BPF_FUNC_sock_map_update:
7267                 return &bpf_sock_map_update_proto;
7268         case BPF_FUNC_sock_hash_update:
7269                 return &bpf_sock_hash_update_proto;
7270         case BPF_FUNC_get_socket_cookie:
7271                 return &bpf_get_socket_cookie_sock_ops_proto;
7272         case BPF_FUNC_get_local_storage:
7273                 return &bpf_get_local_storage_proto;
7274         case BPF_FUNC_perf_event_output:
7275                 return &bpf_event_output_data_proto;
7276         case BPF_FUNC_sk_storage_get:
7277                 return &bpf_sk_storage_get_proto;
7278         case BPF_FUNC_sk_storage_delete:
7279                 return &bpf_sk_storage_delete_proto;
7280 #ifdef CONFIG_INET
7281         case BPF_FUNC_load_hdr_opt:
7282                 return &bpf_sock_ops_load_hdr_opt_proto;
7283         case BPF_FUNC_store_hdr_opt:
7284                 return &bpf_sock_ops_store_hdr_opt_proto;
7285         case BPF_FUNC_reserve_hdr_opt:
7286                 return &bpf_sock_ops_reserve_hdr_opt_proto;
7287         case BPF_FUNC_tcp_sock:
7288                 return &bpf_tcp_sock_proto;
7289 #endif /* CONFIG_INET */
7290         default:
7291                 return bpf_sk_base_func_proto(func_id);
7292         }
7293 }
7294
7295 const struct bpf_func_proto bpf_msg_redirect_map_proto __weak;
7296 const struct bpf_func_proto bpf_msg_redirect_hash_proto __weak;
7297
7298 static const struct bpf_func_proto *
7299 sk_msg_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7300 {
7301         switch (func_id) {
7302         case BPF_FUNC_msg_redirect_map:
7303                 return &bpf_msg_redirect_map_proto;
7304         case BPF_FUNC_msg_redirect_hash:
7305                 return &bpf_msg_redirect_hash_proto;
7306         case BPF_FUNC_msg_apply_bytes:
7307                 return &bpf_msg_apply_bytes_proto;
7308         case BPF_FUNC_msg_cork_bytes:
7309                 return &bpf_msg_cork_bytes_proto;
7310         case BPF_FUNC_msg_pull_data:
7311                 return &bpf_msg_pull_data_proto;
7312         case BPF_FUNC_msg_push_data:
7313                 return &bpf_msg_push_data_proto;
7314         case BPF_FUNC_msg_pop_data:
7315                 return &bpf_msg_pop_data_proto;
7316         case BPF_FUNC_perf_event_output:
7317                 return &bpf_event_output_data_proto;
7318         case BPF_FUNC_get_current_uid_gid:
7319                 return &bpf_get_current_uid_gid_proto;
7320         case BPF_FUNC_get_current_pid_tgid:
7321                 return &bpf_get_current_pid_tgid_proto;
7322         case BPF_FUNC_sk_storage_get:
7323                 return &bpf_sk_storage_get_proto;
7324         case BPF_FUNC_sk_storage_delete:
7325                 return &bpf_sk_storage_delete_proto;
7326 #ifdef CONFIG_CGROUPS
7327         case BPF_FUNC_get_current_cgroup_id:
7328                 return &bpf_get_current_cgroup_id_proto;
7329         case BPF_FUNC_get_current_ancestor_cgroup_id:
7330                 return &bpf_get_current_ancestor_cgroup_id_proto;
7331 #endif
7332 #ifdef CONFIG_CGROUP_NET_CLASSID
7333         case BPF_FUNC_get_cgroup_classid:
7334                 return &bpf_get_cgroup_classid_curr_proto;
7335 #endif
7336         default:
7337                 return bpf_sk_base_func_proto(func_id);
7338         }
7339 }
7340
7341 const struct bpf_func_proto bpf_sk_redirect_map_proto __weak;
7342 const struct bpf_func_proto bpf_sk_redirect_hash_proto __weak;
7343
7344 static const struct bpf_func_proto *
7345 sk_skb_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7346 {
7347         switch (func_id) {
7348         case BPF_FUNC_skb_store_bytes:
7349                 return &bpf_skb_store_bytes_proto;
7350         case BPF_FUNC_skb_load_bytes:
7351                 return &bpf_skb_load_bytes_proto;
7352         case BPF_FUNC_skb_pull_data:
7353                 return &sk_skb_pull_data_proto;
7354         case BPF_FUNC_skb_change_tail:
7355                 return &sk_skb_change_tail_proto;
7356         case BPF_FUNC_skb_change_head:
7357                 return &sk_skb_change_head_proto;
7358         case BPF_FUNC_skb_adjust_room:
7359                 return &sk_skb_adjust_room_proto;
7360         case BPF_FUNC_get_socket_cookie:
7361                 return &bpf_get_socket_cookie_proto;
7362         case BPF_FUNC_get_socket_uid:
7363                 return &bpf_get_socket_uid_proto;
7364         case BPF_FUNC_sk_redirect_map:
7365                 return &bpf_sk_redirect_map_proto;
7366         case BPF_FUNC_sk_redirect_hash:
7367                 return &bpf_sk_redirect_hash_proto;
7368         case BPF_FUNC_perf_event_output:
7369                 return &bpf_skb_event_output_proto;
7370 #ifdef CONFIG_INET
7371         case BPF_FUNC_sk_lookup_tcp:
7372                 return &bpf_sk_lookup_tcp_proto;
7373         case BPF_FUNC_sk_lookup_udp:
7374                 return &bpf_sk_lookup_udp_proto;
7375         case BPF_FUNC_sk_release:
7376                 return &bpf_sk_release_proto;
7377         case BPF_FUNC_skc_lookup_tcp:
7378                 return &bpf_skc_lookup_tcp_proto;
7379 #endif
7380         default:
7381                 return bpf_sk_base_func_proto(func_id);
7382         }
7383 }
7384
7385 static const struct bpf_func_proto *
7386 flow_dissector_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7387 {
7388         switch (func_id) {
7389         case BPF_FUNC_skb_load_bytes:
7390                 return &bpf_flow_dissector_load_bytes_proto;
7391         default:
7392                 return bpf_sk_base_func_proto(func_id);
7393         }
7394 }
7395
7396 static const struct bpf_func_proto *
7397 lwt_out_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7398 {
7399         switch (func_id) {
7400         case BPF_FUNC_skb_load_bytes:
7401                 return &bpf_skb_load_bytes_proto;
7402         case BPF_FUNC_skb_pull_data:
7403                 return &bpf_skb_pull_data_proto;
7404         case BPF_FUNC_csum_diff:
7405                 return &bpf_csum_diff_proto;
7406         case BPF_FUNC_get_cgroup_classid:
7407                 return &bpf_get_cgroup_classid_proto;
7408         case BPF_FUNC_get_route_realm:
7409                 return &bpf_get_route_realm_proto;
7410         case BPF_FUNC_get_hash_recalc:
7411                 return &bpf_get_hash_recalc_proto;
7412         case BPF_FUNC_perf_event_output:
7413                 return &bpf_skb_event_output_proto;
7414         case BPF_FUNC_get_smp_processor_id:
7415                 return &bpf_get_smp_processor_id_proto;
7416         case BPF_FUNC_skb_under_cgroup:
7417                 return &bpf_skb_under_cgroup_proto;
7418         default:
7419                 return bpf_sk_base_func_proto(func_id);
7420         }
7421 }
7422
7423 static const struct bpf_func_proto *
7424 lwt_in_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7425 {
7426         switch (func_id) {
7427         case BPF_FUNC_lwt_push_encap:
7428                 return &bpf_lwt_in_push_encap_proto;
7429         default:
7430                 return lwt_out_func_proto(func_id, prog);
7431         }
7432 }
7433
7434 static const struct bpf_func_proto *
7435 lwt_xmit_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7436 {
7437         switch (func_id) {
7438         case BPF_FUNC_skb_get_tunnel_key:
7439                 return &bpf_skb_get_tunnel_key_proto;
7440         case BPF_FUNC_skb_set_tunnel_key:
7441                 return bpf_get_skb_set_tunnel_proto(func_id);
7442         case BPF_FUNC_skb_get_tunnel_opt:
7443                 return &bpf_skb_get_tunnel_opt_proto;
7444         case BPF_FUNC_skb_set_tunnel_opt:
7445                 return bpf_get_skb_set_tunnel_proto(func_id);
7446         case BPF_FUNC_redirect:
7447                 return &bpf_redirect_proto;
7448         case BPF_FUNC_clone_redirect:
7449                 return &bpf_clone_redirect_proto;
7450         case BPF_FUNC_skb_change_tail:
7451                 return &bpf_skb_change_tail_proto;
7452         case BPF_FUNC_skb_change_head:
7453                 return &bpf_skb_change_head_proto;
7454         case BPF_FUNC_skb_store_bytes:
7455                 return &bpf_skb_store_bytes_proto;
7456         case BPF_FUNC_csum_update:
7457                 return &bpf_csum_update_proto;
7458         case BPF_FUNC_csum_level:
7459                 return &bpf_csum_level_proto;
7460         case BPF_FUNC_l3_csum_replace:
7461                 return &bpf_l3_csum_replace_proto;
7462         case BPF_FUNC_l4_csum_replace:
7463                 return &bpf_l4_csum_replace_proto;
7464         case BPF_FUNC_set_hash_invalid:
7465                 return &bpf_set_hash_invalid_proto;
7466         case BPF_FUNC_lwt_push_encap:
7467                 return &bpf_lwt_xmit_push_encap_proto;
7468         default:
7469                 return lwt_out_func_proto(func_id, prog);
7470         }
7471 }
7472
7473 static const struct bpf_func_proto *
7474 lwt_seg6local_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
7475 {
7476         switch (func_id) {
7477 #if IS_ENABLED(CONFIG_IPV6_SEG6_BPF)
7478         case BPF_FUNC_lwt_seg6_store_bytes:
7479                 return &bpf_lwt_seg6_store_bytes_proto;
7480         case BPF_FUNC_lwt_seg6_action:
7481                 return &bpf_lwt_seg6_action_proto;
7482         case BPF_FUNC_lwt_seg6_adjust_srh:
7483                 return &bpf_lwt_seg6_adjust_srh_proto;
7484 #endif
7485         default:
7486                 return lwt_out_func_proto(func_id, prog);
7487         }
7488 }
7489
7490 static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type,
7491                                     const struct bpf_prog *prog,
7492                                     struct bpf_insn_access_aux *info)
7493 {
7494         const int size_default = sizeof(__u32);
7495
7496         if (off < 0 || off >= sizeof(struct __sk_buff))
7497                 return false;
7498
7499         /* The verifier guarantees that size > 0. */
7500         if (off % size != 0)
7501                 return false;
7502
7503         switch (off) {
7504         case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7505                 if (off + size > offsetofend(struct __sk_buff, cb[4]))
7506                         return false;
7507                 break;
7508         case bpf_ctx_range_till(struct __sk_buff, remote_ip6[0], remote_ip6[3]):
7509         case bpf_ctx_range_till(struct __sk_buff, local_ip6[0], local_ip6[3]):
7510         case bpf_ctx_range_till(struct __sk_buff, remote_ip4, remote_ip4):
7511         case bpf_ctx_range_till(struct __sk_buff, local_ip4, local_ip4):
7512         case bpf_ctx_range(struct __sk_buff, data):
7513         case bpf_ctx_range(struct __sk_buff, data_meta):
7514         case bpf_ctx_range(struct __sk_buff, data_end):
7515                 if (size != size_default)
7516                         return false;
7517                 break;
7518         case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
7519                 return false;
7520         case bpf_ctx_range(struct __sk_buff, tstamp):
7521                 if (size != sizeof(__u64))
7522                         return false;
7523                 break;
7524         case offsetof(struct __sk_buff, sk):
7525                 if (type == BPF_WRITE || size != sizeof(__u64))
7526                         return false;
7527                 info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
7528                 break;
7529         default:
7530                 /* Only narrow read access allowed for now. */
7531                 if (type == BPF_WRITE) {
7532                         if (size != size_default)
7533                                 return false;
7534                 } else {
7535                         bpf_ctx_record_field_size(info, size_default);
7536                         if (!bpf_ctx_narrow_access_ok(off, size, size_default))
7537                                 return false;
7538                 }
7539         }
7540
7541         return true;
7542 }
7543
7544 static bool sk_filter_is_valid_access(int off, int size,
7545                                       enum bpf_access_type type,
7546                                       const struct bpf_prog *prog,
7547                                       struct bpf_insn_access_aux *info)
7548 {
7549         switch (off) {
7550         case bpf_ctx_range(struct __sk_buff, tc_classid):
7551         case bpf_ctx_range(struct __sk_buff, data):
7552         case bpf_ctx_range(struct __sk_buff, data_meta):
7553         case bpf_ctx_range(struct __sk_buff, data_end):
7554         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
7555         case bpf_ctx_range(struct __sk_buff, tstamp):
7556         case bpf_ctx_range(struct __sk_buff, wire_len):
7557                 return false;
7558         }
7559
7560         if (type == BPF_WRITE) {
7561                 switch (off) {
7562                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7563                         break;
7564                 default:
7565                         return false;
7566                 }
7567         }
7568
7569         return bpf_skb_is_valid_access(off, size, type, prog, info);
7570 }
7571
7572 static bool cg_skb_is_valid_access(int off, int size,
7573                                    enum bpf_access_type type,
7574                                    const struct bpf_prog *prog,
7575                                    struct bpf_insn_access_aux *info)
7576 {
7577         switch (off) {
7578         case bpf_ctx_range(struct __sk_buff, tc_classid):
7579         case bpf_ctx_range(struct __sk_buff, data_meta):
7580         case bpf_ctx_range(struct __sk_buff, wire_len):
7581                 return false;
7582         case bpf_ctx_range(struct __sk_buff, data):
7583         case bpf_ctx_range(struct __sk_buff, data_end):
7584                 if (!bpf_capable())
7585                         return false;
7586                 break;
7587         }
7588
7589         if (type == BPF_WRITE) {
7590                 switch (off) {
7591                 case bpf_ctx_range(struct __sk_buff, mark):
7592                 case bpf_ctx_range(struct __sk_buff, priority):
7593                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7594                         break;
7595                 case bpf_ctx_range(struct __sk_buff, tstamp):
7596                         if (!bpf_capable())
7597                                 return false;
7598                         break;
7599                 default:
7600                         return false;
7601                 }
7602         }
7603
7604         switch (off) {
7605         case bpf_ctx_range(struct __sk_buff, data):
7606                 info->reg_type = PTR_TO_PACKET;
7607                 break;
7608         case bpf_ctx_range(struct __sk_buff, data_end):
7609                 info->reg_type = PTR_TO_PACKET_END;
7610                 break;
7611         }
7612
7613         return bpf_skb_is_valid_access(off, size, type, prog, info);
7614 }
7615
7616 static bool lwt_is_valid_access(int off, int size,
7617                                 enum bpf_access_type type,
7618                                 const struct bpf_prog *prog,
7619                                 struct bpf_insn_access_aux *info)
7620 {
7621         switch (off) {
7622         case bpf_ctx_range(struct __sk_buff, tc_classid):
7623         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
7624         case bpf_ctx_range(struct __sk_buff, data_meta):
7625         case bpf_ctx_range(struct __sk_buff, tstamp):
7626         case bpf_ctx_range(struct __sk_buff, wire_len):
7627                 return false;
7628         }
7629
7630         if (type == BPF_WRITE) {
7631                 switch (off) {
7632                 case bpf_ctx_range(struct __sk_buff, mark):
7633                 case bpf_ctx_range(struct __sk_buff, priority):
7634                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7635                         break;
7636                 default:
7637                         return false;
7638                 }
7639         }
7640
7641         switch (off) {
7642         case bpf_ctx_range(struct __sk_buff, data):
7643                 info->reg_type = PTR_TO_PACKET;
7644                 break;
7645         case bpf_ctx_range(struct __sk_buff, data_end):
7646                 info->reg_type = PTR_TO_PACKET_END;
7647                 break;
7648         }
7649
7650         return bpf_skb_is_valid_access(off, size, type, prog, info);
7651 }
7652
7653 /* Attach type specific accesses */
7654 static bool __sock_filter_check_attach_type(int off,
7655                                             enum bpf_access_type access_type,
7656                                             enum bpf_attach_type attach_type)
7657 {
7658         switch (off) {
7659         case offsetof(struct bpf_sock, bound_dev_if):
7660         case offsetof(struct bpf_sock, mark):
7661         case offsetof(struct bpf_sock, priority):
7662                 switch (attach_type) {
7663                 case BPF_CGROUP_INET_SOCK_CREATE:
7664                 case BPF_CGROUP_INET_SOCK_RELEASE:
7665                         goto full_access;
7666                 default:
7667                         return false;
7668                 }
7669         case bpf_ctx_range(struct bpf_sock, src_ip4):
7670                 switch (attach_type) {
7671                 case BPF_CGROUP_INET4_POST_BIND:
7672                         goto read_only;
7673                 default:
7674                         return false;
7675                 }
7676         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
7677                 switch (attach_type) {
7678                 case BPF_CGROUP_INET6_POST_BIND:
7679                         goto read_only;
7680                 default:
7681                         return false;
7682                 }
7683         case bpf_ctx_range(struct bpf_sock, src_port):
7684                 switch (attach_type) {
7685                 case BPF_CGROUP_INET4_POST_BIND:
7686                 case BPF_CGROUP_INET6_POST_BIND:
7687                         goto read_only;
7688                 default:
7689                         return false;
7690                 }
7691         }
7692 read_only:
7693         return access_type == BPF_READ;
7694 full_access:
7695         return true;
7696 }
7697
7698 bool bpf_sock_common_is_valid_access(int off, int size,
7699                                      enum bpf_access_type type,
7700                                      struct bpf_insn_access_aux *info)
7701 {
7702         switch (off) {
7703         case bpf_ctx_range_till(struct bpf_sock, type, priority):
7704                 return false;
7705         default:
7706                 return bpf_sock_is_valid_access(off, size, type, info);
7707         }
7708 }
7709
7710 bool bpf_sock_is_valid_access(int off, int size, enum bpf_access_type type,
7711                               struct bpf_insn_access_aux *info)
7712 {
7713         const int size_default = sizeof(__u32);
7714
7715         if (off < 0 || off >= sizeof(struct bpf_sock))
7716                 return false;
7717         if (off % size != 0)
7718                 return false;
7719
7720         switch (off) {
7721         case offsetof(struct bpf_sock, state):
7722         case offsetof(struct bpf_sock, family):
7723         case offsetof(struct bpf_sock, type):
7724         case offsetof(struct bpf_sock, protocol):
7725         case offsetof(struct bpf_sock, dst_port):
7726         case offsetof(struct bpf_sock, src_port):
7727         case offsetof(struct bpf_sock, rx_queue_mapping):
7728         case bpf_ctx_range(struct bpf_sock, src_ip4):
7729         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
7730         case bpf_ctx_range(struct bpf_sock, dst_ip4):
7731         case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
7732                 bpf_ctx_record_field_size(info, size_default);
7733                 return bpf_ctx_narrow_access_ok(off, size, size_default);
7734         }
7735
7736         return size == size_default;
7737 }
7738
7739 static bool sock_filter_is_valid_access(int off, int size,
7740                                         enum bpf_access_type type,
7741                                         const struct bpf_prog *prog,
7742                                         struct bpf_insn_access_aux *info)
7743 {
7744         if (!bpf_sock_is_valid_access(off, size, type, info))
7745                 return false;
7746         return __sock_filter_check_attach_type(off, type,
7747                                                prog->expected_attach_type);
7748 }
7749
7750 static int bpf_noop_prologue(struct bpf_insn *insn_buf, bool direct_write,
7751                              const struct bpf_prog *prog)
7752 {
7753         /* Neither direct read nor direct write requires any preliminary
7754          * action.
7755          */
7756         return 0;
7757 }
7758
7759 static int bpf_unclone_prologue(struct bpf_insn *insn_buf, bool direct_write,
7760                                 const struct bpf_prog *prog, int drop_verdict)
7761 {
7762         struct bpf_insn *insn = insn_buf;
7763
7764         if (!direct_write)
7765                 return 0;
7766
7767         /* if (!skb->cloned)
7768          *       goto start;
7769          *
7770          * (Fast-path, otherwise approximation that we might be
7771          *  a clone, do the rest in helper.)
7772          */
7773         *insn++ = BPF_LDX_MEM(BPF_B, BPF_REG_6, BPF_REG_1, CLONED_OFFSET());
7774         *insn++ = BPF_ALU32_IMM(BPF_AND, BPF_REG_6, CLONED_MASK);
7775         *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_6, 0, 7);
7776
7777         /* ret = bpf_skb_pull_data(skb, 0); */
7778         *insn++ = BPF_MOV64_REG(BPF_REG_6, BPF_REG_1);
7779         *insn++ = BPF_ALU64_REG(BPF_XOR, BPF_REG_2, BPF_REG_2);
7780         *insn++ = BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
7781                                BPF_FUNC_skb_pull_data);
7782         /* if (!ret)
7783          *      goto restore;
7784          * return TC_ACT_SHOT;
7785          */
7786         *insn++ = BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2);
7787         *insn++ = BPF_ALU32_IMM(BPF_MOV, BPF_REG_0, drop_verdict);
7788         *insn++ = BPF_EXIT_INSN();
7789
7790         /* restore: */
7791         *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_6);
7792         /* start: */
7793         *insn++ = prog->insnsi[0];
7794
7795         return insn - insn_buf;
7796 }
7797
7798 static int bpf_gen_ld_abs(const struct bpf_insn *orig,
7799                           struct bpf_insn *insn_buf)
7800 {
7801         bool indirect = BPF_MODE(orig->code) == BPF_IND;
7802         struct bpf_insn *insn = insn_buf;
7803
7804         if (!indirect) {
7805                 *insn++ = BPF_MOV64_IMM(BPF_REG_2, orig->imm);
7806         } else {
7807                 *insn++ = BPF_MOV64_REG(BPF_REG_2, orig->src_reg);
7808                 if (orig->imm)
7809                         *insn++ = BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, orig->imm);
7810         }
7811         /* We're guaranteed here that CTX is in R6. */
7812         *insn++ = BPF_MOV64_REG(BPF_REG_1, BPF_REG_CTX);
7813
7814         switch (BPF_SIZE(orig->code)) {
7815         case BPF_B:
7816                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_8_no_cache);
7817                 break;
7818         case BPF_H:
7819                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_16_no_cache);
7820                 break;
7821         case BPF_W:
7822                 *insn++ = BPF_EMIT_CALL(bpf_skb_load_helper_32_no_cache);
7823                 break;
7824         }
7825
7826         *insn++ = BPF_JMP_IMM(BPF_JSGE, BPF_REG_0, 0, 2);
7827         *insn++ = BPF_ALU32_REG(BPF_XOR, BPF_REG_0, BPF_REG_0);
7828         *insn++ = BPF_EXIT_INSN();
7829
7830         return insn - insn_buf;
7831 }
7832
7833 static int tc_cls_act_prologue(struct bpf_insn *insn_buf, bool direct_write,
7834                                const struct bpf_prog *prog)
7835 {
7836         return bpf_unclone_prologue(insn_buf, direct_write, prog, TC_ACT_SHOT);
7837 }
7838
7839 static bool tc_cls_act_is_valid_access(int off, int size,
7840                                        enum bpf_access_type type,
7841                                        const struct bpf_prog *prog,
7842                                        struct bpf_insn_access_aux *info)
7843 {
7844         if (type == BPF_WRITE) {
7845                 switch (off) {
7846                 case bpf_ctx_range(struct __sk_buff, mark):
7847                 case bpf_ctx_range(struct __sk_buff, tc_index):
7848                 case bpf_ctx_range(struct __sk_buff, priority):
7849                 case bpf_ctx_range(struct __sk_buff, tc_classid):
7850                 case bpf_ctx_range_till(struct __sk_buff, cb[0], cb[4]):
7851                 case bpf_ctx_range(struct __sk_buff, tstamp):
7852                 case bpf_ctx_range(struct __sk_buff, queue_mapping):
7853                         break;
7854                 default:
7855                         return false;
7856                 }
7857         }
7858
7859         switch (off) {
7860         case bpf_ctx_range(struct __sk_buff, data):
7861                 info->reg_type = PTR_TO_PACKET;
7862                 break;
7863         case bpf_ctx_range(struct __sk_buff, data_meta):
7864                 info->reg_type = PTR_TO_PACKET_META;
7865                 break;
7866         case bpf_ctx_range(struct __sk_buff, data_end):
7867                 info->reg_type = PTR_TO_PACKET_END;
7868                 break;
7869         case bpf_ctx_range_till(struct __sk_buff, family, local_port):
7870                 return false;
7871         }
7872
7873         return bpf_skb_is_valid_access(off, size, type, prog, info);
7874 }
7875
7876 static bool __is_valid_xdp_access(int off, int size)
7877 {
7878         if (off < 0 || off >= sizeof(struct xdp_md))
7879                 return false;
7880         if (off % size != 0)
7881                 return false;
7882         if (size != sizeof(__u32))
7883                 return false;
7884
7885         return true;
7886 }
7887
7888 static bool xdp_is_valid_access(int off, int size,
7889                                 enum bpf_access_type type,
7890                                 const struct bpf_prog *prog,
7891                                 struct bpf_insn_access_aux *info)
7892 {
7893         if (prog->expected_attach_type != BPF_XDP_DEVMAP) {
7894                 switch (off) {
7895                 case offsetof(struct xdp_md, egress_ifindex):
7896                         return false;
7897                 }
7898         }
7899
7900         if (type == BPF_WRITE) {
7901                 if (bpf_prog_is_dev_bound(prog->aux)) {
7902                         switch (off) {
7903                         case offsetof(struct xdp_md, rx_queue_index):
7904                                 return __is_valid_xdp_access(off, size);
7905                         }
7906                 }
7907                 return false;
7908         }
7909
7910         switch (off) {
7911         case offsetof(struct xdp_md, data):
7912                 info->reg_type = PTR_TO_PACKET;
7913                 break;
7914         case offsetof(struct xdp_md, data_meta):
7915                 info->reg_type = PTR_TO_PACKET_META;
7916                 break;
7917         case offsetof(struct xdp_md, data_end):
7918                 info->reg_type = PTR_TO_PACKET_END;
7919                 break;
7920         }
7921
7922         return __is_valid_xdp_access(off, size);
7923 }
7924
7925 void bpf_warn_invalid_xdp_action(u32 act)
7926 {
7927         const u32 act_max = XDP_REDIRECT;
7928
7929         WARN_ONCE(1, "%s XDP return value %u, expect packet loss!\n",
7930                   act > act_max ? "Illegal" : "Driver unsupported",
7931                   act);
7932 }
7933 EXPORT_SYMBOL_GPL(bpf_warn_invalid_xdp_action);
7934
7935 static bool sock_addr_is_valid_access(int off, int size,
7936                                       enum bpf_access_type type,
7937                                       const struct bpf_prog *prog,
7938                                       struct bpf_insn_access_aux *info)
7939 {
7940         const int size_default = sizeof(__u32);
7941
7942         if (off < 0 || off >= sizeof(struct bpf_sock_addr))
7943                 return false;
7944         if (off % size != 0)
7945                 return false;
7946
7947         /* Disallow access to IPv6 fields from IPv4 contex and vise
7948          * versa.
7949          */
7950         switch (off) {
7951         case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
7952                 switch (prog->expected_attach_type) {
7953                 case BPF_CGROUP_INET4_BIND:
7954                 case BPF_CGROUP_INET4_CONNECT:
7955                 case BPF_CGROUP_INET4_GETPEERNAME:
7956                 case BPF_CGROUP_INET4_GETSOCKNAME:
7957                 case BPF_CGROUP_UDP4_SENDMSG:
7958                 case BPF_CGROUP_UDP4_RECVMSG:
7959                         break;
7960                 default:
7961                         return false;
7962                 }
7963                 break;
7964         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
7965                 switch (prog->expected_attach_type) {
7966                 case BPF_CGROUP_INET6_BIND:
7967                 case BPF_CGROUP_INET6_CONNECT:
7968                 case BPF_CGROUP_INET6_GETPEERNAME:
7969                 case BPF_CGROUP_INET6_GETSOCKNAME:
7970                 case BPF_CGROUP_UDP6_SENDMSG:
7971                 case BPF_CGROUP_UDP6_RECVMSG:
7972                         break;
7973                 default:
7974                         return false;
7975                 }
7976                 break;
7977         case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
7978                 switch (prog->expected_attach_type) {
7979                 case BPF_CGROUP_UDP4_SENDMSG:
7980                         break;
7981                 default:
7982                         return false;
7983                 }
7984                 break;
7985         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
7986                                 msg_src_ip6[3]):
7987                 switch (prog->expected_attach_type) {
7988                 case BPF_CGROUP_UDP6_SENDMSG:
7989                         break;
7990                 default:
7991                         return false;
7992                 }
7993                 break;
7994         }
7995
7996         switch (off) {
7997         case bpf_ctx_range(struct bpf_sock_addr, user_ip4):
7998         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
7999         case bpf_ctx_range(struct bpf_sock_addr, msg_src_ip4):
8000         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
8001                                 msg_src_ip6[3]):
8002         case bpf_ctx_range(struct bpf_sock_addr, user_port):
8003                 if (type == BPF_READ) {
8004                         bpf_ctx_record_field_size(info, size_default);
8005
8006                         if (bpf_ctx_wide_access_ok(off, size,
8007                                                    struct bpf_sock_addr,
8008                                                    user_ip6))
8009                                 return true;
8010
8011                         if (bpf_ctx_wide_access_ok(off, size,
8012                                                    struct bpf_sock_addr,
8013                                                    msg_src_ip6))
8014                                 return true;
8015
8016                         if (!bpf_ctx_narrow_access_ok(off, size, size_default))
8017                                 return false;
8018                 } else {
8019                         if (bpf_ctx_wide_access_ok(off, size,
8020                                                    struct bpf_sock_addr,
8021                                                    user_ip6))
8022                                 return true;
8023
8024                         if (bpf_ctx_wide_access_ok(off, size,
8025                                                    struct bpf_sock_addr,
8026                                                    msg_src_ip6))
8027                                 return true;
8028
8029                         if (size != size_default)
8030                                 return false;
8031                 }
8032                 break;
8033         case offsetof(struct bpf_sock_addr, sk):
8034                 if (type != BPF_READ)
8035                         return false;
8036                 if (size != sizeof(__u64))
8037                         return false;
8038                 info->reg_type = PTR_TO_SOCKET;
8039                 break;
8040         default:
8041                 if (type == BPF_READ) {
8042                         if (size != size_default)
8043                                 return false;
8044                 } else {
8045                         return false;
8046                 }
8047         }
8048
8049         return true;
8050 }
8051
8052 static bool sock_ops_is_valid_access(int off, int size,
8053                                      enum bpf_access_type type,
8054                                      const struct bpf_prog *prog,
8055                                      struct bpf_insn_access_aux *info)
8056 {
8057         const int size_default = sizeof(__u32);
8058
8059         if (off < 0 || off >= sizeof(struct bpf_sock_ops))
8060                 return false;
8061
8062         /* The verifier guarantees that size > 0. */
8063         if (off % size != 0)
8064                 return false;
8065
8066         if (type == BPF_WRITE) {
8067                 switch (off) {
8068                 case offsetof(struct bpf_sock_ops, reply):
8069                 case offsetof(struct bpf_sock_ops, sk_txhash):
8070                         if (size != size_default)
8071                                 return false;
8072                         break;
8073                 default:
8074                         return false;
8075                 }
8076         } else {
8077                 switch (off) {
8078                 case bpf_ctx_range_till(struct bpf_sock_ops, bytes_received,
8079                                         bytes_acked):
8080                         if (size != sizeof(__u64))
8081                                 return false;
8082                         break;
8083                 case offsetof(struct bpf_sock_ops, sk):
8084                         if (size != sizeof(__u64))
8085                                 return false;
8086                         info->reg_type = PTR_TO_SOCKET_OR_NULL;
8087                         break;
8088                 case offsetof(struct bpf_sock_ops, skb_data):
8089                         if (size != sizeof(__u64))
8090                                 return false;
8091                         info->reg_type = PTR_TO_PACKET;
8092                         break;
8093                 case offsetof(struct bpf_sock_ops, skb_data_end):
8094                         if (size != sizeof(__u64))
8095                                 return false;
8096                         info->reg_type = PTR_TO_PACKET_END;
8097                         break;
8098                 case offsetof(struct bpf_sock_ops, skb_tcp_flags):
8099                         bpf_ctx_record_field_size(info, size_default);
8100                         return bpf_ctx_narrow_access_ok(off, size,
8101                                                         size_default);
8102                 default:
8103                         if (size != size_default)
8104                                 return false;
8105                         break;
8106                 }
8107         }
8108
8109         return true;
8110 }
8111
8112 static int sk_skb_prologue(struct bpf_insn *insn_buf, bool direct_write,
8113                            const struct bpf_prog *prog)
8114 {
8115         return bpf_unclone_prologue(insn_buf, direct_write, prog, SK_DROP);
8116 }
8117
8118 static bool sk_skb_is_valid_access(int off, int size,
8119                                    enum bpf_access_type type,
8120                                    const struct bpf_prog *prog,
8121                                    struct bpf_insn_access_aux *info)
8122 {
8123         switch (off) {
8124         case bpf_ctx_range(struct __sk_buff, tc_classid):
8125         case bpf_ctx_range(struct __sk_buff, data_meta):
8126         case bpf_ctx_range(struct __sk_buff, tstamp):
8127         case bpf_ctx_range(struct __sk_buff, wire_len):
8128                 return false;
8129         }
8130
8131         if (type == BPF_WRITE) {
8132                 switch (off) {
8133                 case bpf_ctx_range(struct __sk_buff, tc_index):
8134                 case bpf_ctx_range(struct __sk_buff, priority):
8135                         break;
8136                 default:
8137                         return false;
8138                 }
8139         }
8140
8141         switch (off) {
8142         case bpf_ctx_range(struct __sk_buff, mark):
8143                 return false;
8144         case bpf_ctx_range(struct __sk_buff, data):
8145                 info->reg_type = PTR_TO_PACKET;
8146                 break;
8147         case bpf_ctx_range(struct __sk_buff, data_end):
8148                 info->reg_type = PTR_TO_PACKET_END;
8149                 break;
8150         }
8151
8152         return bpf_skb_is_valid_access(off, size, type, prog, info);
8153 }
8154
8155 static bool sk_msg_is_valid_access(int off, int size,
8156                                    enum bpf_access_type type,
8157                                    const struct bpf_prog *prog,
8158                                    struct bpf_insn_access_aux *info)
8159 {
8160         if (type == BPF_WRITE)
8161                 return false;
8162
8163         if (off % size != 0)
8164                 return false;
8165
8166         switch (off) {
8167         case offsetof(struct sk_msg_md, data):
8168                 info->reg_type = PTR_TO_PACKET;
8169                 if (size != sizeof(__u64))
8170                         return false;
8171                 break;
8172         case offsetof(struct sk_msg_md, data_end):
8173                 info->reg_type = PTR_TO_PACKET_END;
8174                 if (size != sizeof(__u64))
8175                         return false;
8176                 break;
8177         case offsetof(struct sk_msg_md, sk):
8178                 if (size != sizeof(__u64))
8179                         return false;
8180                 info->reg_type = PTR_TO_SOCKET;
8181                 break;
8182         case bpf_ctx_range(struct sk_msg_md, family):
8183         case bpf_ctx_range(struct sk_msg_md, remote_ip4):
8184         case bpf_ctx_range(struct sk_msg_md, local_ip4):
8185         case bpf_ctx_range_till(struct sk_msg_md, remote_ip6[0], remote_ip6[3]):
8186         case bpf_ctx_range_till(struct sk_msg_md, local_ip6[0], local_ip6[3]):
8187         case bpf_ctx_range(struct sk_msg_md, remote_port):
8188         case bpf_ctx_range(struct sk_msg_md, local_port):
8189         case bpf_ctx_range(struct sk_msg_md, size):
8190                 if (size != sizeof(__u32))
8191                         return false;
8192                 break;
8193         default:
8194                 return false;
8195         }
8196         return true;
8197 }
8198
8199 static bool flow_dissector_is_valid_access(int off, int size,
8200                                            enum bpf_access_type type,
8201                                            const struct bpf_prog *prog,
8202                                            struct bpf_insn_access_aux *info)
8203 {
8204         const int size_default = sizeof(__u32);
8205
8206         if (off < 0 || off >= sizeof(struct __sk_buff))
8207                 return false;
8208
8209         if (type == BPF_WRITE)
8210                 return false;
8211
8212         switch (off) {
8213         case bpf_ctx_range(struct __sk_buff, data):
8214                 if (size != size_default)
8215                         return false;
8216                 info->reg_type = PTR_TO_PACKET;
8217                 return true;
8218         case bpf_ctx_range(struct __sk_buff, data_end):
8219                 if (size != size_default)
8220                         return false;
8221                 info->reg_type = PTR_TO_PACKET_END;
8222                 return true;
8223         case bpf_ctx_range_ptr(struct __sk_buff, flow_keys):
8224                 if (size != sizeof(__u64))
8225                         return false;
8226                 info->reg_type = PTR_TO_FLOW_KEYS;
8227                 return true;
8228         default:
8229                 return false;
8230         }
8231 }
8232
8233 static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type,
8234                                              const struct bpf_insn *si,
8235                                              struct bpf_insn *insn_buf,
8236                                              struct bpf_prog *prog,
8237                                              u32 *target_size)
8238
8239 {
8240         struct bpf_insn *insn = insn_buf;
8241
8242         switch (si->off) {
8243         case offsetof(struct __sk_buff, data):
8244                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data),
8245                                       si->dst_reg, si->src_reg,
8246                                       offsetof(struct bpf_flow_dissector, data));
8247                 break;
8248
8249         case offsetof(struct __sk_buff, data_end):
8250                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, data_end),
8251                                       si->dst_reg, si->src_reg,
8252                                       offsetof(struct bpf_flow_dissector, data_end));
8253                 break;
8254
8255         case offsetof(struct __sk_buff, flow_keys):
8256                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_flow_dissector, flow_keys),
8257                                       si->dst_reg, si->src_reg,
8258                                       offsetof(struct bpf_flow_dissector, flow_keys));
8259                 break;
8260         }
8261
8262         return insn - insn_buf;
8263 }
8264
8265 static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si,
8266                                                   struct bpf_insn *insn)
8267 {
8268         /* si->dst_reg = skb_shinfo(SKB); */
8269 #ifdef NET_SKBUFF_DATA_USES_OFFSET
8270         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
8271                               BPF_REG_AX, si->src_reg,
8272                               offsetof(struct sk_buff, end));
8273         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, head),
8274                               si->dst_reg, si->src_reg,
8275                               offsetof(struct sk_buff, head));
8276         *insn++ = BPF_ALU64_REG(BPF_ADD, si->dst_reg, BPF_REG_AX);
8277 #else
8278         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, end),
8279                               si->dst_reg, si->src_reg,
8280                               offsetof(struct sk_buff, end));
8281 #endif
8282
8283         return insn;
8284 }
8285
8286 static u32 bpf_convert_ctx_access(enum bpf_access_type type,
8287                                   const struct bpf_insn *si,
8288                                   struct bpf_insn *insn_buf,
8289                                   struct bpf_prog *prog, u32 *target_size)
8290 {
8291         struct bpf_insn *insn = insn_buf;
8292         int off;
8293
8294         switch (si->off) {
8295         case offsetof(struct __sk_buff, len):
8296                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8297                                       bpf_target_off(struct sk_buff, len, 4,
8298                                                      target_size));
8299                 break;
8300
8301         case offsetof(struct __sk_buff, protocol):
8302                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8303                                       bpf_target_off(struct sk_buff, protocol, 2,
8304                                                      target_size));
8305                 break;
8306
8307         case offsetof(struct __sk_buff, vlan_proto):
8308                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8309                                       bpf_target_off(struct sk_buff, vlan_proto, 2,
8310                                                      target_size));
8311                 break;
8312
8313         case offsetof(struct __sk_buff, priority):
8314                 if (type == BPF_WRITE)
8315                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8316                                               bpf_target_off(struct sk_buff, priority, 4,
8317                                                              target_size));
8318                 else
8319                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8320                                               bpf_target_off(struct sk_buff, priority, 4,
8321                                                              target_size));
8322                 break;
8323
8324         case offsetof(struct __sk_buff, ingress_ifindex):
8325                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8326                                       bpf_target_off(struct sk_buff, skb_iif, 4,
8327                                                      target_size));
8328                 break;
8329
8330         case offsetof(struct __sk_buff, ifindex):
8331                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
8332                                       si->dst_reg, si->src_reg,
8333                                       offsetof(struct sk_buff, dev));
8334                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
8335                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8336                                       bpf_target_off(struct net_device, ifindex, 4,
8337                                                      target_size));
8338                 break;
8339
8340         case offsetof(struct __sk_buff, hash):
8341                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8342                                       bpf_target_off(struct sk_buff, hash, 4,
8343                                                      target_size));
8344                 break;
8345
8346         case offsetof(struct __sk_buff, mark):
8347                 if (type == BPF_WRITE)
8348                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8349                                               bpf_target_off(struct sk_buff, mark, 4,
8350                                                              target_size));
8351                 else
8352                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8353                                               bpf_target_off(struct sk_buff, mark, 4,
8354                                                              target_size));
8355                 break;
8356
8357         case offsetof(struct __sk_buff, pkt_type):
8358                 *target_size = 1;
8359                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
8360                                       PKT_TYPE_OFFSET());
8361                 *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, PKT_TYPE_MAX);
8362 #ifdef __BIG_ENDIAN_BITFIELD
8363                 *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, 5);
8364 #endif
8365                 break;
8366
8367         case offsetof(struct __sk_buff, queue_mapping):
8368                 if (type == BPF_WRITE) {
8369                         *insn++ = BPF_JMP_IMM(BPF_JGE, si->src_reg, NO_QUEUE_MAPPING, 1);
8370                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
8371                                               bpf_target_off(struct sk_buff,
8372                                                              queue_mapping,
8373                                                              2, target_size));
8374                 } else {
8375                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8376                                               bpf_target_off(struct sk_buff,
8377                                                              queue_mapping,
8378                                                              2, target_size));
8379                 }
8380                 break;
8381
8382         case offsetof(struct __sk_buff, vlan_present):
8383                 *target_size = 1;
8384                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->src_reg,
8385                                       PKT_VLAN_PRESENT_OFFSET());
8386                 if (PKT_VLAN_PRESENT_BIT)
8387                         *insn++ = BPF_ALU32_IMM(BPF_RSH, si->dst_reg, PKT_VLAN_PRESENT_BIT);
8388                 if (PKT_VLAN_PRESENT_BIT < 7)
8389                         *insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, 1);
8390                 break;
8391
8392         case offsetof(struct __sk_buff, vlan_tci):
8393                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8394                                       bpf_target_off(struct sk_buff, vlan_tci, 2,
8395                                                      target_size));
8396                 break;
8397
8398         case offsetof(struct __sk_buff, cb[0]) ...
8399              offsetofend(struct __sk_buff, cb[4]) - 1:
8400                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, data) < 20);
8401                 BUILD_BUG_ON((offsetof(struct sk_buff, cb) +
8402                               offsetof(struct qdisc_skb_cb, data)) %
8403                              sizeof(__u64));
8404
8405                 prog->cb_access = 1;
8406                 off  = si->off;
8407                 off -= offsetof(struct __sk_buff, cb[0]);
8408                 off += offsetof(struct sk_buff, cb);
8409                 off += offsetof(struct qdisc_skb_cb, data);
8410                 if (type == BPF_WRITE)
8411                         *insn++ = BPF_STX_MEM(BPF_SIZE(si->code), si->dst_reg,
8412                                               si->src_reg, off);
8413                 else
8414                         *insn++ = BPF_LDX_MEM(BPF_SIZE(si->code), si->dst_reg,
8415                                               si->src_reg, off);
8416                 break;
8417
8418         case offsetof(struct __sk_buff, tc_classid):
8419                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, tc_classid) != 2);
8420
8421                 off  = si->off;
8422                 off -= offsetof(struct __sk_buff, tc_classid);
8423                 off += offsetof(struct sk_buff, cb);
8424                 off += offsetof(struct qdisc_skb_cb, tc_classid);
8425                 *target_size = 2;
8426                 if (type == BPF_WRITE)
8427                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg,
8428                                               si->src_reg, off);
8429                 else
8430                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg,
8431                                               si->src_reg, off);
8432                 break;
8433
8434         case offsetof(struct __sk_buff, data):
8435                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
8436                                       si->dst_reg, si->src_reg,
8437                                       offsetof(struct sk_buff, data));
8438                 break;
8439
8440         case offsetof(struct __sk_buff, data_meta):
8441                 off  = si->off;
8442                 off -= offsetof(struct __sk_buff, data_meta);
8443                 off += offsetof(struct sk_buff, cb);
8444                 off += offsetof(struct bpf_skb_data_end, data_meta);
8445                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
8446                                       si->src_reg, off);
8447                 break;
8448
8449         case offsetof(struct __sk_buff, data_end):
8450                 off  = si->off;
8451                 off -= offsetof(struct __sk_buff, data_end);
8452                 off += offsetof(struct sk_buff, cb);
8453                 off += offsetof(struct bpf_skb_data_end, data_end);
8454                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
8455                                       si->src_reg, off);
8456                 break;
8457
8458         case offsetof(struct __sk_buff, tc_index):
8459 #ifdef CONFIG_NET_SCHED
8460                 if (type == BPF_WRITE)
8461                         *insn++ = BPF_STX_MEM(BPF_H, si->dst_reg, si->src_reg,
8462                                               bpf_target_off(struct sk_buff, tc_index, 2,
8463                                                              target_size));
8464                 else
8465                         *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
8466                                               bpf_target_off(struct sk_buff, tc_index, 2,
8467                                                              target_size));
8468 #else
8469                 *target_size = 2;
8470                 if (type == BPF_WRITE)
8471                         *insn++ = BPF_MOV64_REG(si->dst_reg, si->dst_reg);
8472                 else
8473                         *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
8474 #endif
8475                 break;
8476
8477         case offsetof(struct __sk_buff, napi_id):
8478 #if defined(CONFIG_NET_RX_BUSY_POLL)
8479                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8480                                       bpf_target_off(struct sk_buff, napi_id, 4,
8481                                                      target_size));
8482                 *insn++ = BPF_JMP_IMM(BPF_JGE, si->dst_reg, MIN_NAPI_ID, 1);
8483                 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
8484 #else
8485                 *target_size = 4;
8486                 *insn++ = BPF_MOV64_IMM(si->dst_reg, 0);
8487 #endif
8488                 break;
8489         case offsetof(struct __sk_buff, family):
8490                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
8491
8492                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8493                                       si->dst_reg, si->src_reg,
8494                                       offsetof(struct sk_buff, sk));
8495                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8496                                       bpf_target_off(struct sock_common,
8497                                                      skc_family,
8498                                                      2, target_size));
8499                 break;
8500         case offsetof(struct __sk_buff, remote_ip4):
8501                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
8502
8503                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8504                                       si->dst_reg, si->src_reg,
8505                                       offsetof(struct sk_buff, sk));
8506                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8507                                       bpf_target_off(struct sock_common,
8508                                                      skc_daddr,
8509                                                      4, target_size));
8510                 break;
8511         case offsetof(struct __sk_buff, local_ip4):
8512                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8513                                           skc_rcv_saddr) != 4);
8514
8515                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8516                                       si->dst_reg, si->src_reg,
8517                                       offsetof(struct sk_buff, sk));
8518                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8519                                       bpf_target_off(struct sock_common,
8520                                                      skc_rcv_saddr,
8521                                                      4, target_size));
8522                 break;
8523         case offsetof(struct __sk_buff, remote_ip6[0]) ...
8524              offsetof(struct __sk_buff, remote_ip6[3]):
8525 #if IS_ENABLED(CONFIG_IPV6)
8526                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8527                                           skc_v6_daddr.s6_addr32[0]) != 4);
8528
8529                 off = si->off;
8530                 off -= offsetof(struct __sk_buff, remote_ip6[0]);
8531
8532                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8533                                       si->dst_reg, si->src_reg,
8534                                       offsetof(struct sk_buff, sk));
8535                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8536                                       offsetof(struct sock_common,
8537                                                skc_v6_daddr.s6_addr32[0]) +
8538                                       off);
8539 #else
8540                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8541 #endif
8542                 break;
8543         case offsetof(struct __sk_buff, local_ip6[0]) ...
8544              offsetof(struct __sk_buff, local_ip6[3]):
8545 #if IS_ENABLED(CONFIG_IPV6)
8546                 BUILD_BUG_ON(sizeof_field(struct sock_common,
8547                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
8548
8549                 off = si->off;
8550                 off -= offsetof(struct __sk_buff, local_ip6[0]);
8551
8552                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8553                                       si->dst_reg, si->src_reg,
8554                                       offsetof(struct sk_buff, sk));
8555                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8556                                       offsetof(struct sock_common,
8557                                                skc_v6_rcv_saddr.s6_addr32[0]) +
8558                                       off);
8559 #else
8560                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8561 #endif
8562                 break;
8563
8564         case offsetof(struct __sk_buff, remote_port):
8565                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
8566
8567                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8568                                       si->dst_reg, si->src_reg,
8569                                       offsetof(struct sk_buff, sk));
8570                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8571                                       bpf_target_off(struct sock_common,
8572                                                      skc_dport,
8573                                                      2, target_size));
8574 #ifndef __BIG_ENDIAN_BITFIELD
8575                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
8576 #endif
8577                 break;
8578
8579         case offsetof(struct __sk_buff, local_port):
8580                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
8581
8582                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8583                                       si->dst_reg, si->src_reg,
8584                                       offsetof(struct sk_buff, sk));
8585                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
8586                                       bpf_target_off(struct sock_common,
8587                                                      skc_num, 2, target_size));
8588                 break;
8589
8590         case offsetof(struct __sk_buff, tstamp):
8591                 BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8);
8592
8593                 if (type == BPF_WRITE)
8594                         *insn++ = BPF_STX_MEM(BPF_DW,
8595                                               si->dst_reg, si->src_reg,
8596                                               bpf_target_off(struct sk_buff,
8597                                                              tstamp, 8,
8598                                                              target_size));
8599                 else
8600                         *insn++ = BPF_LDX_MEM(BPF_DW,
8601                                               si->dst_reg, si->src_reg,
8602                                               bpf_target_off(struct sk_buff,
8603                                                              tstamp, 8,
8604                                                              target_size));
8605                 break;
8606
8607         case offsetof(struct __sk_buff, gso_segs):
8608                 insn = bpf_convert_shinfo_access(si, insn);
8609                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_segs),
8610                                       si->dst_reg, si->dst_reg,
8611                                       bpf_target_off(struct skb_shared_info,
8612                                                      gso_segs, 2,
8613                                                      target_size));
8614                 break;
8615         case offsetof(struct __sk_buff, gso_size):
8616                 insn = bpf_convert_shinfo_access(si, insn);
8617                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct skb_shared_info, gso_size),
8618                                       si->dst_reg, si->dst_reg,
8619                                       bpf_target_off(struct skb_shared_info,
8620                                                      gso_size, 2,
8621                                                      target_size));
8622                 break;
8623         case offsetof(struct __sk_buff, wire_len):
8624                 BUILD_BUG_ON(sizeof_field(struct qdisc_skb_cb, pkt_len) != 4);
8625
8626                 off = si->off;
8627                 off -= offsetof(struct __sk_buff, wire_len);
8628                 off += offsetof(struct sk_buff, cb);
8629                 off += offsetof(struct qdisc_skb_cb, pkt_len);
8630                 *target_size = 4;
8631                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg, off);
8632                 break;
8633
8634         case offsetof(struct __sk_buff, sk):
8635                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, sk),
8636                                       si->dst_reg, si->src_reg,
8637                                       offsetof(struct sk_buff, sk));
8638                 break;
8639         }
8640
8641         return insn - insn_buf;
8642 }
8643
8644 u32 bpf_sock_convert_ctx_access(enum bpf_access_type type,
8645                                 const struct bpf_insn *si,
8646                                 struct bpf_insn *insn_buf,
8647                                 struct bpf_prog *prog, u32 *target_size)
8648 {
8649         struct bpf_insn *insn = insn_buf;
8650         int off;
8651
8652         switch (si->off) {
8653         case offsetof(struct bpf_sock, bound_dev_if):
8654                 BUILD_BUG_ON(sizeof_field(struct sock, sk_bound_dev_if) != 4);
8655
8656                 if (type == BPF_WRITE)
8657                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8658                                         offsetof(struct sock, sk_bound_dev_if));
8659                 else
8660                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8661                                       offsetof(struct sock, sk_bound_dev_if));
8662                 break;
8663
8664         case offsetof(struct bpf_sock, mark):
8665                 BUILD_BUG_ON(sizeof_field(struct sock, sk_mark) != 4);
8666
8667                 if (type == BPF_WRITE)
8668                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8669                                         offsetof(struct sock, sk_mark));
8670                 else
8671                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8672                                       offsetof(struct sock, sk_mark));
8673                 break;
8674
8675         case offsetof(struct bpf_sock, priority):
8676                 BUILD_BUG_ON(sizeof_field(struct sock, sk_priority) != 4);
8677
8678                 if (type == BPF_WRITE)
8679                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
8680                                         offsetof(struct sock, sk_priority));
8681                 else
8682                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
8683                                       offsetof(struct sock, sk_priority));
8684                 break;
8685
8686         case offsetof(struct bpf_sock, family):
8687                 *insn++ = BPF_LDX_MEM(
8688                         BPF_FIELD_SIZEOF(struct sock_common, skc_family),
8689                         si->dst_reg, si->src_reg,
8690                         bpf_target_off(struct sock_common,
8691                                        skc_family,
8692                                        sizeof_field(struct sock_common,
8693                                                     skc_family),
8694                                        target_size));
8695                 break;
8696
8697         case offsetof(struct bpf_sock, type):
8698                 *insn++ = BPF_LDX_MEM(
8699                         BPF_FIELD_SIZEOF(struct sock, sk_type),
8700                         si->dst_reg, si->src_reg,
8701                         bpf_target_off(struct sock, sk_type,
8702                                        sizeof_field(struct sock, sk_type),
8703                                        target_size));
8704                 break;
8705
8706         case offsetof(struct bpf_sock, protocol):
8707                 *insn++ = BPF_LDX_MEM(
8708                         BPF_FIELD_SIZEOF(struct sock, sk_protocol),
8709                         si->dst_reg, si->src_reg,
8710                         bpf_target_off(struct sock, sk_protocol,
8711                                        sizeof_field(struct sock, sk_protocol),
8712                                        target_size));
8713                 break;
8714
8715         case offsetof(struct bpf_sock, src_ip4):
8716                 *insn++ = BPF_LDX_MEM(
8717                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8718                         bpf_target_off(struct sock_common, skc_rcv_saddr,
8719                                        sizeof_field(struct sock_common,
8720                                                     skc_rcv_saddr),
8721                                        target_size));
8722                 break;
8723
8724         case offsetof(struct bpf_sock, dst_ip4):
8725                 *insn++ = BPF_LDX_MEM(
8726                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8727                         bpf_target_off(struct sock_common, skc_daddr,
8728                                        sizeof_field(struct sock_common,
8729                                                     skc_daddr),
8730                                        target_size));
8731                 break;
8732
8733         case bpf_ctx_range_till(struct bpf_sock, src_ip6[0], src_ip6[3]):
8734 #if IS_ENABLED(CONFIG_IPV6)
8735                 off = si->off;
8736                 off -= offsetof(struct bpf_sock, src_ip6[0]);
8737                 *insn++ = BPF_LDX_MEM(
8738                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8739                         bpf_target_off(
8740                                 struct sock_common,
8741                                 skc_v6_rcv_saddr.s6_addr32[0],
8742                                 sizeof_field(struct sock_common,
8743                                              skc_v6_rcv_saddr.s6_addr32[0]),
8744                                 target_size) + off);
8745 #else
8746                 (void)off;
8747                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8748 #endif
8749                 break;
8750
8751         case bpf_ctx_range_till(struct bpf_sock, dst_ip6[0], dst_ip6[3]):
8752 #if IS_ENABLED(CONFIG_IPV6)
8753                 off = si->off;
8754                 off -= offsetof(struct bpf_sock, dst_ip6[0]);
8755                 *insn++ = BPF_LDX_MEM(
8756                         BPF_SIZE(si->code), si->dst_reg, si->src_reg,
8757                         bpf_target_off(struct sock_common,
8758                                        skc_v6_daddr.s6_addr32[0],
8759                                        sizeof_field(struct sock_common,
8760                                                     skc_v6_daddr.s6_addr32[0]),
8761                                        target_size) + off);
8762 #else
8763                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
8764                 *target_size = 4;
8765 #endif
8766                 break;
8767
8768         case offsetof(struct bpf_sock, src_port):
8769                 *insn++ = BPF_LDX_MEM(
8770                         BPF_FIELD_SIZEOF(struct sock_common, skc_num),
8771                         si->dst_reg, si->src_reg,
8772                         bpf_target_off(struct sock_common, skc_num,
8773                                        sizeof_field(struct sock_common,
8774                                                     skc_num),
8775                                        target_size));
8776                 break;
8777
8778         case offsetof(struct bpf_sock, dst_port):
8779                 *insn++ = BPF_LDX_MEM(
8780                         BPF_FIELD_SIZEOF(struct sock_common, skc_dport),
8781                         si->dst_reg, si->src_reg,
8782                         bpf_target_off(struct sock_common, skc_dport,
8783                                        sizeof_field(struct sock_common,
8784                                                     skc_dport),
8785                                        target_size));
8786                 break;
8787
8788         case offsetof(struct bpf_sock, state):
8789                 *insn++ = BPF_LDX_MEM(
8790                         BPF_FIELD_SIZEOF(struct sock_common, skc_state),
8791                         si->dst_reg, si->src_reg,
8792                         bpf_target_off(struct sock_common, skc_state,
8793                                        sizeof_field(struct sock_common,
8794                                                     skc_state),
8795                                        target_size));
8796                 break;
8797         case offsetof(struct bpf_sock, rx_queue_mapping):
8798 #ifdef CONFIG_XPS
8799                 *insn++ = BPF_LDX_MEM(
8800                         BPF_FIELD_SIZEOF(struct sock, sk_rx_queue_mapping),
8801                         si->dst_reg, si->src_reg,
8802                         bpf_target_off(struct sock, sk_rx_queue_mapping,
8803                                        sizeof_field(struct sock,
8804                                                     sk_rx_queue_mapping),
8805                                        target_size));
8806                 *insn++ = BPF_JMP_IMM(BPF_JNE, si->dst_reg, NO_QUEUE_MAPPING,
8807                                       1);
8808                 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
8809 #else
8810                 *insn++ = BPF_MOV64_IMM(si->dst_reg, -1);
8811                 *target_size = 2;
8812 #endif
8813                 break;
8814         }
8815
8816         return insn - insn_buf;
8817 }
8818
8819 static u32 tc_cls_act_convert_ctx_access(enum bpf_access_type type,
8820                                          const struct bpf_insn *si,
8821                                          struct bpf_insn *insn_buf,
8822                                          struct bpf_prog *prog, u32 *target_size)
8823 {
8824         struct bpf_insn *insn = insn_buf;
8825
8826         switch (si->off) {
8827         case offsetof(struct __sk_buff, ifindex):
8828                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, dev),
8829                                       si->dst_reg, si->src_reg,
8830                                       offsetof(struct sk_buff, dev));
8831                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8832                                       bpf_target_off(struct net_device, ifindex, 4,
8833                                                      target_size));
8834                 break;
8835         default:
8836                 return bpf_convert_ctx_access(type, si, insn_buf, prog,
8837                                               target_size);
8838         }
8839
8840         return insn - insn_buf;
8841 }
8842
8843 static u32 xdp_convert_ctx_access(enum bpf_access_type type,
8844                                   const struct bpf_insn *si,
8845                                   struct bpf_insn *insn_buf,
8846                                   struct bpf_prog *prog, u32 *target_size)
8847 {
8848         struct bpf_insn *insn = insn_buf;
8849
8850         switch (si->off) {
8851         case offsetof(struct xdp_md, data):
8852                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data),
8853                                       si->dst_reg, si->src_reg,
8854                                       offsetof(struct xdp_buff, data));
8855                 break;
8856         case offsetof(struct xdp_md, data_meta):
8857                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_meta),
8858                                       si->dst_reg, si->src_reg,
8859                                       offsetof(struct xdp_buff, data_meta));
8860                 break;
8861         case offsetof(struct xdp_md, data_end):
8862                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, data_end),
8863                                       si->dst_reg, si->src_reg,
8864                                       offsetof(struct xdp_buff, data_end));
8865                 break;
8866         case offsetof(struct xdp_md, ingress_ifindex):
8867                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
8868                                       si->dst_reg, si->src_reg,
8869                                       offsetof(struct xdp_buff, rxq));
8870                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_rxq_info, dev),
8871                                       si->dst_reg, si->dst_reg,
8872                                       offsetof(struct xdp_rxq_info, dev));
8873                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8874                                       offsetof(struct net_device, ifindex));
8875                 break;
8876         case offsetof(struct xdp_md, rx_queue_index):
8877                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, rxq),
8878                                       si->dst_reg, si->src_reg,
8879                                       offsetof(struct xdp_buff, rxq));
8880                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8881                                       offsetof(struct xdp_rxq_info,
8882                                                queue_index));
8883                 break;
8884         case offsetof(struct xdp_md, egress_ifindex):
8885                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_buff, txq),
8886                                       si->dst_reg, si->src_reg,
8887                                       offsetof(struct xdp_buff, txq));
8888                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct xdp_txq_info, dev),
8889                                       si->dst_reg, si->dst_reg,
8890                                       offsetof(struct xdp_txq_info, dev));
8891                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
8892                                       offsetof(struct net_device, ifindex));
8893                 break;
8894         }
8895
8896         return insn - insn_buf;
8897 }
8898
8899 /* SOCK_ADDR_LOAD_NESTED_FIELD() loads Nested Field S.F.NF where S is type of
8900  * context Structure, F is Field in context structure that contains a pointer
8901  * to Nested Structure of type NS that has the field NF.
8902  *
8903  * SIZE encodes the load size (BPF_B, BPF_H, etc). It's up to caller to make
8904  * sure that SIZE is not greater than actual size of S.F.NF.
8905  *
8906  * If offset OFF is provided, the load happens from that offset relative to
8907  * offset of NF.
8908  */
8909 #define SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF)          \
8910         do {                                                                   \
8911                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), si->dst_reg,     \
8912                                       si->src_reg, offsetof(S, F));            \
8913                 *insn++ = BPF_LDX_MEM(                                         \
8914                         SIZE, si->dst_reg, si->dst_reg,                        \
8915                         bpf_target_off(NS, NF, sizeof_field(NS, NF),           \
8916                                        target_size)                            \
8917                                 + OFF);                                        \
8918         } while (0)
8919
8920 #define SOCK_ADDR_LOAD_NESTED_FIELD(S, NS, F, NF)                              \
8921         SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(S, NS, F, NF,                     \
8922                                              BPF_FIELD_SIZEOF(NS, NF), 0)
8923
8924 /* SOCK_ADDR_STORE_NESTED_FIELD_OFF() has semantic similar to
8925  * SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF() but for store operation.
8926  *
8927  * In addition it uses Temporary Field TF (member of struct S) as the 3rd
8928  * "register" since two registers available in convert_ctx_access are not
8929  * enough: we can't override neither SRC, since it contains value to store, nor
8930  * DST since it contains pointer to context that may be used by later
8931  * instructions. But we need a temporary place to save pointer to nested
8932  * structure whose field we want to store to.
8933  */
8934 #define SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE, OFF, TF)          \
8935         do {                                                                   \
8936                 int tmp_reg = BPF_REG_9;                                       \
8937                 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg)          \
8938                         --tmp_reg;                                             \
8939                 if (si->src_reg == tmp_reg || si->dst_reg == tmp_reg)          \
8940                         --tmp_reg;                                             \
8941                 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, tmp_reg,            \
8942                                       offsetof(S, TF));                        \
8943                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(S, F), tmp_reg,         \
8944                                       si->dst_reg, offsetof(S, F));            \
8945                 *insn++ = BPF_STX_MEM(SIZE, tmp_reg, si->src_reg,              \
8946                         bpf_target_off(NS, NF, sizeof_field(NS, NF),           \
8947                                        target_size)                            \
8948                                 + OFF);                                        \
8949                 *insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, si->dst_reg,            \
8950                                       offsetof(S, TF));                        \
8951         } while (0)
8952
8953 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(S, NS, F, NF, SIZE, OFF, \
8954                                                       TF)                      \
8955         do {                                                                   \
8956                 if (type == BPF_WRITE) {                                       \
8957                         SOCK_ADDR_STORE_NESTED_FIELD_OFF(S, NS, F, NF, SIZE,   \
8958                                                          OFF, TF);             \
8959                 } else {                                                       \
8960                         SOCK_ADDR_LOAD_NESTED_FIELD_SIZE_OFF(                  \
8961                                 S, NS, F, NF, SIZE, OFF);  \
8962                 }                                                              \
8963         } while (0)
8964
8965 #define SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD(S, NS, F, NF, TF)                 \
8966         SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(                         \
8967                 S, NS, F, NF, BPF_FIELD_SIZEOF(NS, NF), 0, TF)
8968
8969 static u32 sock_addr_convert_ctx_access(enum bpf_access_type type,
8970                                         const struct bpf_insn *si,
8971                                         struct bpf_insn *insn_buf,
8972                                         struct bpf_prog *prog, u32 *target_size)
8973 {
8974         int off, port_size = sizeof_field(struct sockaddr_in6, sin6_port);
8975         struct bpf_insn *insn = insn_buf;
8976
8977         switch (si->off) {
8978         case offsetof(struct bpf_sock_addr, user_family):
8979                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
8980                                             struct sockaddr, uaddr, sa_family);
8981                 break;
8982
8983         case offsetof(struct bpf_sock_addr, user_ip4):
8984                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8985                         struct bpf_sock_addr_kern, struct sockaddr_in, uaddr,
8986                         sin_addr, BPF_SIZE(si->code), 0, tmp_reg);
8987                 break;
8988
8989         case bpf_ctx_range_till(struct bpf_sock_addr, user_ip6[0], user_ip6[3]):
8990                 off = si->off;
8991                 off -= offsetof(struct bpf_sock_addr, user_ip6[0]);
8992                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
8993                         struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
8994                         sin6_addr.s6_addr32[0], BPF_SIZE(si->code), off,
8995                         tmp_reg);
8996                 break;
8997
8998         case offsetof(struct bpf_sock_addr, user_port):
8999                 /* To get port we need to know sa_family first and then treat
9000                  * sockaddr as either sockaddr_in or sockaddr_in6.
9001                  * Though we can simplify since port field has same offset and
9002                  * size in both structures.
9003                  * Here we check this invariant and use just one of the
9004                  * structures if it's true.
9005                  */
9006                 BUILD_BUG_ON(offsetof(struct sockaddr_in, sin_port) !=
9007                              offsetof(struct sockaddr_in6, sin6_port));
9008                 BUILD_BUG_ON(sizeof_field(struct sockaddr_in, sin_port) !=
9009                              sizeof_field(struct sockaddr_in6, sin6_port));
9010                 /* Account for sin6_port being smaller than user_port. */
9011                 port_size = min(port_size, BPF_LDST_BYTES(si));
9012                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9013                         struct bpf_sock_addr_kern, struct sockaddr_in6, uaddr,
9014                         sin6_port, bytes_to_bpf_size(port_size), 0, tmp_reg);
9015                 break;
9016
9017         case offsetof(struct bpf_sock_addr, family):
9018                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9019                                             struct sock, sk, sk_family);
9020                 break;
9021
9022         case offsetof(struct bpf_sock_addr, type):
9023                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9024                                             struct sock, sk, sk_type);
9025                 break;
9026
9027         case offsetof(struct bpf_sock_addr, protocol):
9028                 SOCK_ADDR_LOAD_NESTED_FIELD(struct bpf_sock_addr_kern,
9029                                             struct sock, sk, sk_protocol);
9030                 break;
9031
9032         case offsetof(struct bpf_sock_addr, msg_src_ip4):
9033                 /* Treat t_ctx as struct in_addr for msg_src_ip4. */
9034                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9035                         struct bpf_sock_addr_kern, struct in_addr, t_ctx,
9036                         s_addr, BPF_SIZE(si->code), 0, tmp_reg);
9037                 break;
9038
9039         case bpf_ctx_range_till(struct bpf_sock_addr, msg_src_ip6[0],
9040                                 msg_src_ip6[3]):
9041                 off = si->off;
9042                 off -= offsetof(struct bpf_sock_addr, msg_src_ip6[0]);
9043                 /* Treat t_ctx as struct in6_addr for msg_src_ip6. */
9044                 SOCK_ADDR_LOAD_OR_STORE_NESTED_FIELD_SIZE_OFF(
9045                         struct bpf_sock_addr_kern, struct in6_addr, t_ctx,
9046                         s6_addr32[0], BPF_SIZE(si->code), off, tmp_reg);
9047                 break;
9048         case offsetof(struct bpf_sock_addr, sk):
9049                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_addr_kern, sk),
9050                                       si->dst_reg, si->src_reg,
9051                                       offsetof(struct bpf_sock_addr_kern, sk));
9052                 break;
9053         }
9054
9055         return insn - insn_buf;
9056 }
9057
9058 static u32 sock_ops_convert_ctx_access(enum bpf_access_type type,
9059                                        const struct bpf_insn *si,
9060                                        struct bpf_insn *insn_buf,
9061                                        struct bpf_prog *prog,
9062                                        u32 *target_size)
9063 {
9064         struct bpf_insn *insn = insn_buf;
9065         int off;
9066
9067 /* Helper macro for adding read access to tcp_sock or sock fields. */
9068 #define SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ)                         \
9069         do {                                                                  \
9070                 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 2;     \
9071                 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) >                   \
9072                              sizeof_field(struct bpf_sock_ops, BPF_FIELD));   \
9073                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9074                         reg--;                                                \
9075                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9076                         reg--;                                                \
9077                 if (si->dst_reg == si->src_reg) {                             \
9078                         *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg,       \
9079                                           offsetof(struct bpf_sock_ops_kern,  \
9080                                           temp));                             \
9081                         fullsock_reg = reg;                                   \
9082                         jmp += 2;                                             \
9083                 }                                                             \
9084                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9085                                                 struct bpf_sock_ops_kern,     \
9086                                                 is_fullsock),                 \
9087                                       fullsock_reg, si->src_reg,              \
9088                                       offsetof(struct bpf_sock_ops_kern,      \
9089                                                is_fullsock));                 \
9090                 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp);         \
9091                 if (si->dst_reg == si->src_reg)                               \
9092                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
9093                                       offsetof(struct bpf_sock_ops_kern,      \
9094                                       temp));                                 \
9095                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9096                                                 struct bpf_sock_ops_kern, sk),\
9097                                       si->dst_reg, si->src_reg,               \
9098                                       offsetof(struct bpf_sock_ops_kern, sk));\
9099                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(OBJ,                   \
9100                                                        OBJ_FIELD),            \
9101                                       si->dst_reg, si->dst_reg,               \
9102                                       offsetof(OBJ, OBJ_FIELD));              \
9103                 if (si->dst_reg == si->src_reg) {                             \
9104                         *insn++ = BPF_JMP_A(1);                               \
9105                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
9106                                       offsetof(struct bpf_sock_ops_kern,      \
9107                                       temp));                                 \
9108                 }                                                             \
9109         } while (0)
9110
9111 #define SOCK_OPS_GET_SK()                                                             \
9112         do {                                                                  \
9113                 int fullsock_reg = si->dst_reg, reg = BPF_REG_9, jmp = 1;     \
9114                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9115                         reg--;                                                \
9116                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9117                         reg--;                                                \
9118                 if (si->dst_reg == si->src_reg) {                             \
9119                         *insn++ = BPF_STX_MEM(BPF_DW, si->src_reg, reg,       \
9120                                           offsetof(struct bpf_sock_ops_kern,  \
9121                                           temp));                             \
9122                         fullsock_reg = reg;                                   \
9123                         jmp += 2;                                             \
9124                 }                                                             \
9125                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9126                                                 struct bpf_sock_ops_kern,     \
9127                                                 is_fullsock),                 \
9128                                       fullsock_reg, si->src_reg,              \
9129                                       offsetof(struct bpf_sock_ops_kern,      \
9130                                                is_fullsock));                 \
9131                 *insn++ = BPF_JMP_IMM(BPF_JEQ, fullsock_reg, 0, jmp);         \
9132                 if (si->dst_reg == si->src_reg)                               \
9133                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
9134                                       offsetof(struct bpf_sock_ops_kern,      \
9135                                       temp));                                 \
9136                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9137                                                 struct bpf_sock_ops_kern, sk),\
9138                                       si->dst_reg, si->src_reg,               \
9139                                       offsetof(struct bpf_sock_ops_kern, sk));\
9140                 if (si->dst_reg == si->src_reg) {                             \
9141                         *insn++ = BPF_JMP_A(1);                               \
9142                         *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->src_reg,       \
9143                                       offsetof(struct bpf_sock_ops_kern,      \
9144                                       temp));                                 \
9145                 }                                                             \
9146         } while (0)
9147
9148 #define SOCK_OPS_GET_TCP_SOCK_FIELD(FIELD) \
9149                 SOCK_OPS_GET_FIELD(FIELD, FIELD, struct tcp_sock)
9150
9151 /* Helper macro for adding write access to tcp_sock or sock fields.
9152  * The macro is called with two registers, dst_reg which contains a pointer
9153  * to ctx (context) and src_reg which contains the value that should be
9154  * stored. However, we need an additional register since we cannot overwrite
9155  * dst_reg because it may be used later in the program.
9156  * Instead we "borrow" one of the other register. We first save its value
9157  * into a new (temp) field in bpf_sock_ops_kern, use it, and then restore
9158  * it at the end of the macro.
9159  */
9160 #define SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ)                         \
9161         do {                                                                  \
9162                 int reg = BPF_REG_9;                                          \
9163                 BUILD_BUG_ON(sizeof_field(OBJ, OBJ_FIELD) >                   \
9164                              sizeof_field(struct bpf_sock_ops, BPF_FIELD));   \
9165                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9166                         reg--;                                                \
9167                 if (si->dst_reg == reg || si->src_reg == reg)                 \
9168                         reg--;                                                \
9169                 *insn++ = BPF_STX_MEM(BPF_DW, si->dst_reg, reg,               \
9170                                       offsetof(struct bpf_sock_ops_kern,      \
9171                                                temp));                        \
9172                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9173                                                 struct bpf_sock_ops_kern,     \
9174                                                 is_fullsock),                 \
9175                                       reg, si->dst_reg,                       \
9176                                       offsetof(struct bpf_sock_ops_kern,      \
9177                                                is_fullsock));                 \
9178                 *insn++ = BPF_JMP_IMM(BPF_JEQ, reg, 0, 2);                    \
9179                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(                       \
9180                                                 struct bpf_sock_ops_kern, sk),\
9181                                       reg, si->dst_reg,                       \
9182                                       offsetof(struct bpf_sock_ops_kern, sk));\
9183                 *insn++ = BPF_STX_MEM(BPF_FIELD_SIZEOF(OBJ, OBJ_FIELD),       \
9184                                       reg, si->src_reg,                       \
9185                                       offsetof(OBJ, OBJ_FIELD));              \
9186                 *insn++ = BPF_LDX_MEM(BPF_DW, reg, si->dst_reg,               \
9187                                       offsetof(struct bpf_sock_ops_kern,      \
9188                                                temp));                        \
9189         } while (0)
9190
9191 #define SOCK_OPS_GET_OR_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ, TYPE)            \
9192         do {                                                                  \
9193                 if (TYPE == BPF_WRITE)                                        \
9194                         SOCK_OPS_SET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);        \
9195                 else                                                          \
9196                         SOCK_OPS_GET_FIELD(BPF_FIELD, OBJ_FIELD, OBJ);        \
9197         } while (0)
9198
9199         if (insn > insn_buf)
9200                 return insn - insn_buf;
9201
9202         switch (si->off) {
9203         case offsetof(struct bpf_sock_ops, op):
9204                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9205                                                        op),
9206                                       si->dst_reg, si->src_reg,
9207                                       offsetof(struct bpf_sock_ops_kern, op));
9208                 break;
9209
9210         case offsetof(struct bpf_sock_ops, replylong[0]) ...
9211              offsetof(struct bpf_sock_ops, replylong[3]):
9212                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, reply) !=
9213                              sizeof_field(struct bpf_sock_ops_kern, reply));
9214                 BUILD_BUG_ON(sizeof_field(struct bpf_sock_ops, replylong) !=
9215                              sizeof_field(struct bpf_sock_ops_kern, replylong));
9216                 off = si->off;
9217                 off -= offsetof(struct bpf_sock_ops, replylong[0]);
9218                 off += offsetof(struct bpf_sock_ops_kern, replylong[0]);
9219                 if (type == BPF_WRITE)
9220                         *insn++ = BPF_STX_MEM(BPF_W, si->dst_reg, si->src_reg,
9221                                               off);
9222                 else
9223                         *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
9224                                               off);
9225                 break;
9226
9227         case offsetof(struct bpf_sock_ops, family):
9228                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
9229
9230                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9231                                               struct bpf_sock_ops_kern, sk),
9232                                       si->dst_reg, si->src_reg,
9233                                       offsetof(struct bpf_sock_ops_kern, sk));
9234                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9235                                       offsetof(struct sock_common, skc_family));
9236                 break;
9237
9238         case offsetof(struct bpf_sock_ops, remote_ip4):
9239                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
9240
9241                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9242                                                 struct bpf_sock_ops_kern, sk),
9243                                       si->dst_reg, si->src_reg,
9244                                       offsetof(struct bpf_sock_ops_kern, sk));
9245                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9246                                       offsetof(struct sock_common, skc_daddr));
9247                 break;
9248
9249         case offsetof(struct bpf_sock_ops, local_ip4):
9250                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9251                                           skc_rcv_saddr) != 4);
9252
9253                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9254                                               struct bpf_sock_ops_kern, sk),
9255                                       si->dst_reg, si->src_reg,
9256                                       offsetof(struct bpf_sock_ops_kern, sk));
9257                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9258                                       offsetof(struct sock_common,
9259                                                skc_rcv_saddr));
9260                 break;
9261
9262         case offsetof(struct bpf_sock_ops, remote_ip6[0]) ...
9263              offsetof(struct bpf_sock_ops, remote_ip6[3]):
9264 #if IS_ENABLED(CONFIG_IPV6)
9265                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9266                                           skc_v6_daddr.s6_addr32[0]) != 4);
9267
9268                 off = si->off;
9269                 off -= offsetof(struct bpf_sock_ops, remote_ip6[0]);
9270                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9271                                                 struct bpf_sock_ops_kern, sk),
9272                                       si->dst_reg, si->src_reg,
9273                                       offsetof(struct bpf_sock_ops_kern, sk));
9274                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9275                                       offsetof(struct sock_common,
9276                                                skc_v6_daddr.s6_addr32[0]) +
9277                                       off);
9278 #else
9279                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9280 #endif
9281                 break;
9282
9283         case offsetof(struct bpf_sock_ops, local_ip6[0]) ...
9284              offsetof(struct bpf_sock_ops, local_ip6[3]):
9285 #if IS_ENABLED(CONFIG_IPV6)
9286                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9287                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
9288
9289                 off = si->off;
9290                 off -= offsetof(struct bpf_sock_ops, local_ip6[0]);
9291                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9292                                                 struct bpf_sock_ops_kern, sk),
9293                                       si->dst_reg, si->src_reg,
9294                                       offsetof(struct bpf_sock_ops_kern, sk));
9295                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9296                                       offsetof(struct sock_common,
9297                                                skc_v6_rcv_saddr.s6_addr32[0]) +
9298                                       off);
9299 #else
9300                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9301 #endif
9302                 break;
9303
9304         case offsetof(struct bpf_sock_ops, remote_port):
9305                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
9306
9307                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9308                                                 struct bpf_sock_ops_kern, sk),
9309                                       si->dst_reg, si->src_reg,
9310                                       offsetof(struct bpf_sock_ops_kern, sk));
9311                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9312                                       offsetof(struct sock_common, skc_dport));
9313 #ifndef __BIG_ENDIAN_BITFIELD
9314                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
9315 #endif
9316                 break;
9317
9318         case offsetof(struct bpf_sock_ops, local_port):
9319                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
9320
9321                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9322                                                 struct bpf_sock_ops_kern, sk),
9323                                       si->dst_reg, si->src_reg,
9324                                       offsetof(struct bpf_sock_ops_kern, sk));
9325                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9326                                       offsetof(struct sock_common, skc_num));
9327                 break;
9328
9329         case offsetof(struct bpf_sock_ops, is_fullsock):
9330                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9331                                                 struct bpf_sock_ops_kern,
9332                                                 is_fullsock),
9333                                       si->dst_reg, si->src_reg,
9334                                       offsetof(struct bpf_sock_ops_kern,
9335                                                is_fullsock));
9336                 break;
9337
9338         case offsetof(struct bpf_sock_ops, state):
9339                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_state) != 1);
9340
9341                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9342                                                 struct bpf_sock_ops_kern, sk),
9343                                       si->dst_reg, si->src_reg,
9344                                       offsetof(struct bpf_sock_ops_kern, sk));
9345                 *insn++ = BPF_LDX_MEM(BPF_B, si->dst_reg, si->dst_reg,
9346                                       offsetof(struct sock_common, skc_state));
9347                 break;
9348
9349         case offsetof(struct bpf_sock_ops, rtt_min):
9350                 BUILD_BUG_ON(sizeof_field(struct tcp_sock, rtt_min) !=
9351                              sizeof(struct minmax));
9352                 BUILD_BUG_ON(sizeof(struct minmax) <
9353                              sizeof(struct minmax_sample));
9354
9355                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9356                                                 struct bpf_sock_ops_kern, sk),
9357                                       si->dst_reg, si->src_reg,
9358                                       offsetof(struct bpf_sock_ops_kern, sk));
9359                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9360                                       offsetof(struct tcp_sock, rtt_min) +
9361                                       sizeof_field(struct minmax_sample, t));
9362                 break;
9363
9364         case offsetof(struct bpf_sock_ops, bpf_sock_ops_cb_flags):
9365                 SOCK_OPS_GET_FIELD(bpf_sock_ops_cb_flags, bpf_sock_ops_cb_flags,
9366                                    struct tcp_sock);
9367                 break;
9368
9369         case offsetof(struct bpf_sock_ops, sk_txhash):
9370                 SOCK_OPS_GET_OR_SET_FIELD(sk_txhash, sk_txhash,
9371                                           struct sock, type);
9372                 break;
9373         case offsetof(struct bpf_sock_ops, snd_cwnd):
9374                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_cwnd);
9375                 break;
9376         case offsetof(struct bpf_sock_ops, srtt_us):
9377                 SOCK_OPS_GET_TCP_SOCK_FIELD(srtt_us);
9378                 break;
9379         case offsetof(struct bpf_sock_ops, snd_ssthresh):
9380                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_ssthresh);
9381                 break;
9382         case offsetof(struct bpf_sock_ops, rcv_nxt):
9383                 SOCK_OPS_GET_TCP_SOCK_FIELD(rcv_nxt);
9384                 break;
9385         case offsetof(struct bpf_sock_ops, snd_nxt):
9386                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_nxt);
9387                 break;
9388         case offsetof(struct bpf_sock_ops, snd_una):
9389                 SOCK_OPS_GET_TCP_SOCK_FIELD(snd_una);
9390                 break;
9391         case offsetof(struct bpf_sock_ops, mss_cache):
9392                 SOCK_OPS_GET_TCP_SOCK_FIELD(mss_cache);
9393                 break;
9394         case offsetof(struct bpf_sock_ops, ecn_flags):
9395                 SOCK_OPS_GET_TCP_SOCK_FIELD(ecn_flags);
9396                 break;
9397         case offsetof(struct bpf_sock_ops, rate_delivered):
9398                 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_delivered);
9399                 break;
9400         case offsetof(struct bpf_sock_ops, rate_interval_us):
9401                 SOCK_OPS_GET_TCP_SOCK_FIELD(rate_interval_us);
9402                 break;
9403         case offsetof(struct bpf_sock_ops, packets_out):
9404                 SOCK_OPS_GET_TCP_SOCK_FIELD(packets_out);
9405                 break;
9406         case offsetof(struct bpf_sock_ops, retrans_out):
9407                 SOCK_OPS_GET_TCP_SOCK_FIELD(retrans_out);
9408                 break;
9409         case offsetof(struct bpf_sock_ops, total_retrans):
9410                 SOCK_OPS_GET_TCP_SOCK_FIELD(total_retrans);
9411                 break;
9412         case offsetof(struct bpf_sock_ops, segs_in):
9413                 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_in);
9414                 break;
9415         case offsetof(struct bpf_sock_ops, data_segs_in):
9416                 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_in);
9417                 break;
9418         case offsetof(struct bpf_sock_ops, segs_out):
9419                 SOCK_OPS_GET_TCP_SOCK_FIELD(segs_out);
9420                 break;
9421         case offsetof(struct bpf_sock_ops, data_segs_out):
9422                 SOCK_OPS_GET_TCP_SOCK_FIELD(data_segs_out);
9423                 break;
9424         case offsetof(struct bpf_sock_ops, lost_out):
9425                 SOCK_OPS_GET_TCP_SOCK_FIELD(lost_out);
9426                 break;
9427         case offsetof(struct bpf_sock_ops, sacked_out):
9428                 SOCK_OPS_GET_TCP_SOCK_FIELD(sacked_out);
9429                 break;
9430         case offsetof(struct bpf_sock_ops, bytes_received):
9431                 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_received);
9432                 break;
9433         case offsetof(struct bpf_sock_ops, bytes_acked):
9434                 SOCK_OPS_GET_TCP_SOCK_FIELD(bytes_acked);
9435                 break;
9436         case offsetof(struct bpf_sock_ops, sk):
9437                 SOCK_OPS_GET_SK();
9438                 break;
9439         case offsetof(struct bpf_sock_ops, skb_data_end):
9440                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9441                                                        skb_data_end),
9442                                       si->dst_reg, si->src_reg,
9443                                       offsetof(struct bpf_sock_ops_kern,
9444                                                skb_data_end));
9445                 break;
9446         case offsetof(struct bpf_sock_ops, skb_data):
9447                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9448                                                        skb),
9449                                       si->dst_reg, si->src_reg,
9450                                       offsetof(struct bpf_sock_ops_kern,
9451                                                skb));
9452                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9453                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, data),
9454                                       si->dst_reg, si->dst_reg,
9455                                       offsetof(struct sk_buff, data));
9456                 break;
9457         case offsetof(struct bpf_sock_ops, skb_len):
9458                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9459                                                        skb),
9460                                       si->dst_reg, si->src_reg,
9461                                       offsetof(struct bpf_sock_ops_kern,
9462                                                skb));
9463                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9464                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_buff, len),
9465                                       si->dst_reg, si->dst_reg,
9466                                       offsetof(struct sk_buff, len));
9467                 break;
9468         case offsetof(struct bpf_sock_ops, skb_tcp_flags):
9469                 off = offsetof(struct sk_buff, cb);
9470                 off += offsetof(struct tcp_skb_cb, tcp_flags);
9471                 *target_size = sizeof_field(struct tcp_skb_cb, tcp_flags);
9472                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct bpf_sock_ops_kern,
9473                                                        skb),
9474                                       si->dst_reg, si->src_reg,
9475                                       offsetof(struct bpf_sock_ops_kern,
9476                                                skb));
9477                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
9478                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct tcp_skb_cb,
9479                                                        tcp_flags),
9480                                       si->dst_reg, si->dst_reg, off);
9481                 break;
9482         }
9483         return insn - insn_buf;
9484 }
9485
9486 static u32 sk_skb_convert_ctx_access(enum bpf_access_type type,
9487                                      const struct bpf_insn *si,
9488                                      struct bpf_insn *insn_buf,
9489                                      struct bpf_prog *prog, u32 *target_size)
9490 {
9491         struct bpf_insn *insn = insn_buf;
9492         int off;
9493
9494         switch (si->off) {
9495         case offsetof(struct __sk_buff, data_end):
9496                 off  = si->off;
9497                 off -= offsetof(struct __sk_buff, data_end);
9498                 off += offsetof(struct sk_buff, cb);
9499                 off += offsetof(struct tcp_skb_cb, bpf.data_end);
9500                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg,
9501                                       si->src_reg, off);
9502                 break;
9503         default:
9504                 return bpf_convert_ctx_access(type, si, insn_buf, prog,
9505                                               target_size);
9506         }
9507
9508         return insn - insn_buf;
9509 }
9510
9511 static u32 sk_msg_convert_ctx_access(enum bpf_access_type type,
9512                                      const struct bpf_insn *si,
9513                                      struct bpf_insn *insn_buf,
9514                                      struct bpf_prog *prog, u32 *target_size)
9515 {
9516         struct bpf_insn *insn = insn_buf;
9517 #if IS_ENABLED(CONFIG_IPV6)
9518         int off;
9519 #endif
9520
9521         /* convert ctx uses the fact sg element is first in struct */
9522         BUILD_BUG_ON(offsetof(struct sk_msg, sg) != 0);
9523
9524         switch (si->off) {
9525         case offsetof(struct sk_msg_md, data):
9526                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data),
9527                                       si->dst_reg, si->src_reg,
9528                                       offsetof(struct sk_msg, data));
9529                 break;
9530         case offsetof(struct sk_msg_md, data_end):
9531                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, data_end),
9532                                       si->dst_reg, si->src_reg,
9533                                       offsetof(struct sk_msg, data_end));
9534                 break;
9535         case offsetof(struct sk_msg_md, family):
9536                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_family) != 2);
9537
9538                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9539                                               struct sk_msg, sk),
9540                                       si->dst_reg, si->src_reg,
9541                                       offsetof(struct sk_msg, sk));
9542                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9543                                       offsetof(struct sock_common, skc_family));
9544                 break;
9545
9546         case offsetof(struct sk_msg_md, remote_ip4):
9547                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_daddr) != 4);
9548
9549                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9550                                                 struct sk_msg, sk),
9551                                       si->dst_reg, si->src_reg,
9552                                       offsetof(struct sk_msg, sk));
9553                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9554                                       offsetof(struct sock_common, skc_daddr));
9555                 break;
9556
9557         case offsetof(struct sk_msg_md, local_ip4):
9558                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9559                                           skc_rcv_saddr) != 4);
9560
9561                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9562                                               struct sk_msg, sk),
9563                                       si->dst_reg, si->src_reg,
9564                                       offsetof(struct sk_msg, sk));
9565                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9566                                       offsetof(struct sock_common,
9567                                                skc_rcv_saddr));
9568                 break;
9569
9570         case offsetof(struct sk_msg_md, remote_ip6[0]) ...
9571              offsetof(struct sk_msg_md, remote_ip6[3]):
9572 #if IS_ENABLED(CONFIG_IPV6)
9573                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9574                                           skc_v6_daddr.s6_addr32[0]) != 4);
9575
9576                 off = si->off;
9577                 off -= offsetof(struct sk_msg_md, remote_ip6[0]);
9578                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9579                                                 struct sk_msg, sk),
9580                                       si->dst_reg, si->src_reg,
9581                                       offsetof(struct sk_msg, sk));
9582                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9583                                       offsetof(struct sock_common,
9584                                                skc_v6_daddr.s6_addr32[0]) +
9585                                       off);
9586 #else
9587                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9588 #endif
9589                 break;
9590
9591         case offsetof(struct sk_msg_md, local_ip6[0]) ...
9592              offsetof(struct sk_msg_md, local_ip6[3]):
9593 #if IS_ENABLED(CONFIG_IPV6)
9594                 BUILD_BUG_ON(sizeof_field(struct sock_common,
9595                                           skc_v6_rcv_saddr.s6_addr32[0]) != 4);
9596
9597                 off = si->off;
9598                 off -= offsetof(struct sk_msg_md, local_ip6[0]);
9599                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9600                                                 struct sk_msg, sk),
9601                                       si->dst_reg, si->src_reg,
9602                                       offsetof(struct sk_msg, sk));
9603                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg,
9604                                       offsetof(struct sock_common,
9605                                                skc_v6_rcv_saddr.s6_addr32[0]) +
9606                                       off);
9607 #else
9608                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
9609 #endif
9610                 break;
9611
9612         case offsetof(struct sk_msg_md, remote_port):
9613                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_dport) != 2);
9614
9615                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9616                                                 struct sk_msg, sk),
9617                                       si->dst_reg, si->src_reg,
9618                                       offsetof(struct sk_msg, sk));
9619                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9620                                       offsetof(struct sock_common, skc_dport));
9621 #ifndef __BIG_ENDIAN_BITFIELD
9622                 *insn++ = BPF_ALU32_IMM(BPF_LSH, si->dst_reg, 16);
9623 #endif
9624                 break;
9625
9626         case offsetof(struct sk_msg_md, local_port):
9627                 BUILD_BUG_ON(sizeof_field(struct sock_common, skc_num) != 2);
9628
9629                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(
9630                                                 struct sk_msg, sk),
9631                                       si->dst_reg, si->src_reg,
9632                                       offsetof(struct sk_msg, sk));
9633                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->dst_reg,
9634                                       offsetof(struct sock_common, skc_num));
9635                 break;
9636
9637         case offsetof(struct sk_msg_md, size):
9638                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg_sg, size),
9639                                       si->dst_reg, si->src_reg,
9640                                       offsetof(struct sk_msg_sg, size));
9641                 break;
9642
9643         case offsetof(struct sk_msg_md, sk):
9644                 *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_msg, sk),
9645                                       si->dst_reg, si->src_reg,
9646                                       offsetof(struct sk_msg, sk));
9647                 break;
9648         }
9649
9650         return insn - insn_buf;
9651 }
9652
9653 const struct bpf_verifier_ops sk_filter_verifier_ops = {
9654         .get_func_proto         = sk_filter_func_proto,
9655         .is_valid_access        = sk_filter_is_valid_access,
9656         .convert_ctx_access     = bpf_convert_ctx_access,
9657         .gen_ld_abs             = bpf_gen_ld_abs,
9658 };
9659
9660 const struct bpf_prog_ops sk_filter_prog_ops = {
9661         .test_run               = bpf_prog_test_run_skb,
9662 };
9663
9664 const struct bpf_verifier_ops tc_cls_act_verifier_ops = {
9665         .get_func_proto         = tc_cls_act_func_proto,
9666         .is_valid_access        = tc_cls_act_is_valid_access,
9667         .convert_ctx_access     = tc_cls_act_convert_ctx_access,
9668         .gen_prologue           = tc_cls_act_prologue,
9669         .gen_ld_abs             = bpf_gen_ld_abs,
9670 };
9671
9672 const struct bpf_prog_ops tc_cls_act_prog_ops = {
9673         .test_run               = bpf_prog_test_run_skb,
9674 };
9675
9676 const struct bpf_verifier_ops xdp_verifier_ops = {
9677         .get_func_proto         = xdp_func_proto,
9678         .is_valid_access        = xdp_is_valid_access,
9679         .convert_ctx_access     = xdp_convert_ctx_access,
9680         .gen_prologue           = bpf_noop_prologue,
9681 };
9682
9683 const struct bpf_prog_ops xdp_prog_ops = {
9684         .test_run               = bpf_prog_test_run_xdp,
9685 };
9686
9687 const struct bpf_verifier_ops cg_skb_verifier_ops = {
9688         .get_func_proto         = cg_skb_func_proto,
9689         .is_valid_access        = cg_skb_is_valid_access,
9690         .convert_ctx_access     = bpf_convert_ctx_access,
9691 };
9692
9693 const struct bpf_prog_ops cg_skb_prog_ops = {
9694         .test_run               = bpf_prog_test_run_skb,
9695 };
9696
9697 const struct bpf_verifier_ops lwt_in_verifier_ops = {
9698         .get_func_proto         = lwt_in_func_proto,
9699         .is_valid_access        = lwt_is_valid_access,
9700         .convert_ctx_access     = bpf_convert_ctx_access,
9701 };
9702
9703 const struct bpf_prog_ops lwt_in_prog_ops = {
9704         .test_run               = bpf_prog_test_run_skb,
9705 };
9706
9707 const struct bpf_verifier_ops lwt_out_verifier_ops = {
9708         .get_func_proto         = lwt_out_func_proto,
9709         .is_valid_access        = lwt_is_valid_access,
9710         .convert_ctx_access     = bpf_convert_ctx_access,
9711 };
9712
9713 const struct bpf_prog_ops lwt_out_prog_ops = {
9714         .test_run               = bpf_prog_test_run_skb,
9715 };
9716
9717 const struct bpf_verifier_ops lwt_xmit_verifier_ops = {
9718         .get_func_proto         = lwt_xmit_func_proto,
9719         .is_valid_access        = lwt_is_valid_access,
9720         .convert_ctx_access     = bpf_convert_ctx_access,
9721         .gen_prologue           = tc_cls_act_prologue,
9722 };
9723
9724 const struct bpf_prog_ops lwt_xmit_prog_ops = {
9725         .test_run               = bpf_prog_test_run_skb,
9726 };
9727
9728 const struct bpf_verifier_ops lwt_seg6local_verifier_ops = {
9729         .get_func_proto         = lwt_seg6local_func_proto,
9730         .is_valid_access        = lwt_is_valid_access,
9731         .convert_ctx_access     = bpf_convert_ctx_access,
9732 };
9733
9734 const struct bpf_prog_ops lwt_seg6local_prog_ops = {
9735         .test_run               = bpf_prog_test_run_skb,
9736 };
9737
9738 const struct bpf_verifier_ops cg_sock_verifier_ops = {
9739         .get_func_proto         = sock_filter_func_proto,
9740         .is_valid_access        = sock_filter_is_valid_access,
9741         .convert_ctx_access     = bpf_sock_convert_ctx_access,
9742 };
9743
9744 const struct bpf_prog_ops cg_sock_prog_ops = {
9745 };
9746
9747 const struct bpf_verifier_ops cg_sock_addr_verifier_ops = {
9748         .get_func_proto         = sock_addr_func_proto,
9749         .is_valid_access        = sock_addr_is_valid_access,
9750         .convert_ctx_access     = sock_addr_convert_ctx_access,
9751 };
9752
9753 const struct bpf_prog_ops cg_sock_addr_prog_ops = {
9754 };
9755
9756 const struct bpf_verifier_ops sock_ops_verifier_ops = {
9757         .get_func_proto         = sock_ops_func_proto,
9758         .is_valid_access        = sock_ops_is_valid_access,
9759         .convert_ctx_access     = sock_ops_convert_ctx_access,
9760 };
9761
9762 const struct bpf_prog_ops sock_ops_prog_ops = {
9763 };
9764
9765 const struct bpf_verifier_ops sk_skb_verifier_ops = {
9766         .get_func_proto         = sk_skb_func_proto,
9767         .is_valid_access        = sk_skb_is_valid_access,
9768         .convert_ctx_access     = sk_skb_convert_ctx_access,
9769         .gen_prologue           = sk_skb_prologue,
9770 };
9771
9772 const struct bpf_prog_ops sk_skb_prog_ops = {
9773 };
9774
9775 const struct bpf_verifier_ops sk_msg_verifier_ops = {
9776         .get_func_proto         = sk_msg_func_proto,
9777         .is_valid_access        = sk_msg_is_valid_access,
9778         .convert_ctx_access     = sk_msg_convert_ctx_access,
9779         .gen_prologue           = bpf_noop_prologue,
9780 };
9781
9782 const struct bpf_prog_ops sk_msg_prog_ops = {
9783 };
9784
9785 const struct bpf_verifier_ops flow_dissector_verifier_ops = {
9786         .get_func_proto         = flow_dissector_func_proto,
9787         .is_valid_access        = flow_dissector_is_valid_access,
9788         .convert_ctx_access     = flow_dissector_convert_ctx_access,
9789 };
9790
9791 const struct bpf_prog_ops flow_dissector_prog_ops = {
9792         .test_run               = bpf_prog_test_run_flow_dissector,
9793 };
9794
9795 int sk_detach_filter(struct sock *sk)
9796 {
9797         int ret = -ENOENT;
9798         struct sk_filter *filter;
9799
9800         if (sock_flag(sk, SOCK_FILTER_LOCKED))
9801                 return -EPERM;
9802
9803         filter = rcu_dereference_protected(sk->sk_filter,
9804                                            lockdep_sock_is_held(sk));
9805         if (filter) {
9806                 RCU_INIT_POINTER(sk->sk_filter, NULL);
9807                 sk_filter_uncharge(sk, filter);
9808                 ret = 0;
9809         }
9810
9811         return ret;
9812 }
9813 EXPORT_SYMBOL_GPL(sk_detach_filter);
9814
9815 int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
9816                   unsigned int len)
9817 {
9818         struct sock_fprog_kern *fprog;
9819         struct sk_filter *filter;
9820         int ret = 0;
9821
9822         lock_sock(sk);
9823         filter = rcu_dereference_protected(sk->sk_filter,
9824                                            lockdep_sock_is_held(sk));
9825         if (!filter)
9826                 goto out;
9827
9828         /* We're copying the filter that has been originally attached,
9829          * so no conversion/decode needed anymore. eBPF programs that
9830          * have no original program cannot be dumped through this.
9831          */
9832         ret = -EACCES;
9833         fprog = filter->prog->orig_prog;
9834         if (!fprog)
9835                 goto out;
9836
9837         ret = fprog->len;
9838         if (!len)
9839                 /* User space only enquires number of filter blocks. */
9840                 goto out;
9841
9842         ret = -EINVAL;
9843         if (len < fprog->len)
9844                 goto out;
9845
9846         ret = -EFAULT;
9847         if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
9848                 goto out;
9849
9850         /* Instead of bytes, the API requests to return the number
9851          * of filter blocks.
9852          */
9853         ret = fprog->len;
9854 out:
9855         release_sock(sk);
9856         return ret;
9857 }
9858
9859 #ifdef CONFIG_INET
9860 static void bpf_init_reuseport_kern(struct sk_reuseport_kern *reuse_kern,
9861                                     struct sock_reuseport *reuse,
9862                                     struct sock *sk, struct sk_buff *skb,
9863                                     u32 hash)
9864 {
9865         reuse_kern->skb = skb;
9866         reuse_kern->sk = sk;
9867         reuse_kern->selected_sk = NULL;
9868         reuse_kern->data_end = skb->data + skb_headlen(skb);
9869         reuse_kern->hash = hash;
9870         reuse_kern->reuseport_id = reuse->reuseport_id;
9871         reuse_kern->bind_inany = reuse->bind_inany;
9872 }
9873
9874 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
9875                                   struct bpf_prog *prog, struct sk_buff *skb,
9876                                   u32 hash)
9877 {
9878         struct sk_reuseport_kern reuse_kern;
9879         enum sk_action action;
9880
9881         bpf_init_reuseport_kern(&reuse_kern, reuse, sk, skb, hash);
9882         action = BPF_PROG_RUN(prog, &reuse_kern);
9883
9884         if (action == SK_PASS)
9885                 return reuse_kern.selected_sk;
9886         else
9887                 return ERR_PTR(-ECONNREFUSED);
9888 }
9889
9890 BPF_CALL_4(sk_select_reuseport, struct sk_reuseport_kern *, reuse_kern,
9891            struct bpf_map *, map, void *, key, u32, flags)
9892 {
9893         bool is_sockarray = map->map_type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY;
9894         struct sock_reuseport *reuse;
9895         struct sock *selected_sk;
9896
9897         selected_sk = map->ops->map_lookup_elem(map, key);
9898         if (!selected_sk)
9899                 return -ENOENT;
9900
9901         reuse = rcu_dereference(selected_sk->sk_reuseport_cb);
9902         if (!reuse) {
9903                 /* Lookup in sock_map can return TCP ESTABLISHED sockets. */
9904                 if (sk_is_refcounted(selected_sk))
9905                         sock_put(selected_sk);
9906
9907                 /* reuseport_array has only sk with non NULL sk_reuseport_cb.
9908                  * The only (!reuse) case here is - the sk has already been
9909                  * unhashed (e.g. by close()), so treat it as -ENOENT.
9910                  *
9911                  * Other maps (e.g. sock_map) do not provide this guarantee and
9912                  * the sk may never be in the reuseport group to begin with.
9913                  */
9914                 return is_sockarray ? -ENOENT : -EINVAL;
9915         }
9916
9917         if (unlikely(reuse->reuseport_id != reuse_kern->reuseport_id)) {
9918                 struct sock *sk = reuse_kern->sk;
9919
9920                 if (sk->sk_protocol != selected_sk->sk_protocol)
9921                         return -EPROTOTYPE;
9922                 else if (sk->sk_family != selected_sk->sk_family)
9923                         return -EAFNOSUPPORT;
9924
9925                 /* Catch all. Likely bound to a different sockaddr. */
9926                 return -EBADFD;
9927         }
9928
9929         reuse_kern->selected_sk = selected_sk;
9930
9931         return 0;
9932 }
9933
9934 static const struct bpf_func_proto sk_select_reuseport_proto = {
9935         .func           = sk_select_reuseport,
9936         .gpl_only       = false,
9937         .ret_type       = RET_INTEGER,
9938         .arg1_type      = ARG_PTR_TO_CTX,
9939         .arg2_type      = ARG_CONST_MAP_PTR,
9940         .arg3_type      = ARG_PTR_TO_MAP_KEY,
9941         .arg4_type      = ARG_ANYTHING,
9942 };
9943
9944 BPF_CALL_4(sk_reuseport_load_bytes,
9945            const struct sk_reuseport_kern *, reuse_kern, u32, offset,
9946            void *, to, u32, len)
9947 {
9948         return ____bpf_skb_load_bytes(reuse_kern->skb, offset, to, len);
9949 }
9950
9951 static const struct bpf_func_proto sk_reuseport_load_bytes_proto = {
9952         .func           = sk_reuseport_load_bytes,
9953         .gpl_only       = false,
9954         .ret_type       = RET_INTEGER,
9955         .arg1_type      = ARG_PTR_TO_CTX,
9956         .arg2_type      = ARG_ANYTHING,
9957         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
9958         .arg4_type      = ARG_CONST_SIZE,
9959 };
9960
9961 BPF_CALL_5(sk_reuseport_load_bytes_relative,
9962            const struct sk_reuseport_kern *, reuse_kern, u32, offset,
9963            void *, to, u32, len, u32, start_header)
9964 {
9965         return ____bpf_skb_load_bytes_relative(reuse_kern->skb, offset, to,
9966                                                len, start_header);
9967 }
9968
9969 static const struct bpf_func_proto sk_reuseport_load_bytes_relative_proto = {
9970         .func           = sk_reuseport_load_bytes_relative,
9971         .gpl_only       = false,
9972         .ret_type       = RET_INTEGER,
9973         .arg1_type      = ARG_PTR_TO_CTX,
9974         .arg2_type      = ARG_ANYTHING,
9975         .arg3_type      = ARG_PTR_TO_UNINIT_MEM,
9976         .arg4_type      = ARG_CONST_SIZE,
9977         .arg5_type      = ARG_ANYTHING,
9978 };
9979
9980 static const struct bpf_func_proto *
9981 sk_reuseport_func_proto(enum bpf_func_id func_id,
9982                         const struct bpf_prog *prog)
9983 {
9984         switch (func_id) {
9985         case BPF_FUNC_sk_select_reuseport:
9986                 return &sk_select_reuseport_proto;
9987         case BPF_FUNC_skb_load_bytes:
9988                 return &sk_reuseport_load_bytes_proto;
9989         case BPF_FUNC_skb_load_bytes_relative:
9990                 return &sk_reuseport_load_bytes_relative_proto;
9991         default:
9992                 return bpf_base_func_proto(func_id);
9993         }
9994 }
9995
9996 static bool
9997 sk_reuseport_is_valid_access(int off, int size,
9998                              enum bpf_access_type type,
9999                              const struct bpf_prog *prog,
10000                              struct bpf_insn_access_aux *info)
10001 {
10002         const u32 size_default = sizeof(__u32);
10003
10004         if (off < 0 || off >= sizeof(struct sk_reuseport_md) ||
10005             off % size || type != BPF_READ)
10006                 return false;
10007
10008         switch (off) {
10009         case offsetof(struct sk_reuseport_md, data):
10010                 info->reg_type = PTR_TO_PACKET;
10011                 return size == sizeof(__u64);
10012
10013         case offsetof(struct sk_reuseport_md, data_end):
10014                 info->reg_type = PTR_TO_PACKET_END;
10015                 return size == sizeof(__u64);
10016
10017         case offsetof(struct sk_reuseport_md, hash):
10018                 return size == size_default;
10019
10020         /* Fields that allow narrowing */
10021         case bpf_ctx_range(struct sk_reuseport_md, eth_protocol):
10022                 if (size < sizeof_field(struct sk_buff, protocol))
10023                         return false;
10024                 fallthrough;
10025         case bpf_ctx_range(struct sk_reuseport_md, ip_protocol):
10026         case bpf_ctx_range(struct sk_reuseport_md, bind_inany):
10027         case bpf_ctx_range(struct sk_reuseport_md, len):
10028                 bpf_ctx_record_field_size(info, size_default);
10029                 return bpf_ctx_narrow_access_ok(off, size, size_default);
10030
10031         default:
10032                 return false;
10033         }
10034 }
10035
10036 #define SK_REUSEPORT_LOAD_FIELD(F) ({                                   \
10037         *insn++ = BPF_LDX_MEM(BPF_FIELD_SIZEOF(struct sk_reuseport_kern, F), \
10038                               si->dst_reg, si->src_reg,                 \
10039                               bpf_target_off(struct sk_reuseport_kern, F, \
10040                                              sizeof_field(struct sk_reuseport_kern, F), \
10041                                              target_size));             \
10042         })
10043
10044 #define SK_REUSEPORT_LOAD_SKB_FIELD(SKB_FIELD)                          \
10045         SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern,           \
10046                                     struct sk_buff,                     \
10047                                     skb,                                \
10048                                     SKB_FIELD)
10049
10050 #define SK_REUSEPORT_LOAD_SK_FIELD(SK_FIELD)                            \
10051         SOCK_ADDR_LOAD_NESTED_FIELD(struct sk_reuseport_kern,           \
10052                                     struct sock,                        \
10053                                     sk,                                 \
10054                                     SK_FIELD)
10055
10056 static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
10057                                            const struct bpf_insn *si,
10058                                            struct bpf_insn *insn_buf,
10059                                            struct bpf_prog *prog,
10060                                            u32 *target_size)
10061 {
10062         struct bpf_insn *insn = insn_buf;
10063
10064         switch (si->off) {
10065         case offsetof(struct sk_reuseport_md, data):
10066                 SK_REUSEPORT_LOAD_SKB_FIELD(data);
10067                 break;
10068
10069         case offsetof(struct sk_reuseport_md, len):
10070                 SK_REUSEPORT_LOAD_SKB_FIELD(len);
10071                 break;
10072
10073         case offsetof(struct sk_reuseport_md, eth_protocol):
10074                 SK_REUSEPORT_LOAD_SKB_FIELD(protocol);
10075                 break;
10076
10077         case offsetof(struct sk_reuseport_md, ip_protocol):
10078                 SK_REUSEPORT_LOAD_SK_FIELD(sk_protocol);
10079                 break;
10080
10081         case offsetof(struct sk_reuseport_md, data_end):
10082                 SK_REUSEPORT_LOAD_FIELD(data_end);
10083                 break;
10084
10085         case offsetof(struct sk_reuseport_md, hash):
10086                 SK_REUSEPORT_LOAD_FIELD(hash);
10087                 break;
10088
10089         case offsetof(struct sk_reuseport_md, bind_inany):
10090                 SK_REUSEPORT_LOAD_FIELD(bind_inany);
10091                 break;
10092         }
10093
10094         return insn - insn_buf;
10095 }
10096
10097 const struct bpf_verifier_ops sk_reuseport_verifier_ops = {
10098         .get_func_proto         = sk_reuseport_func_proto,
10099         .is_valid_access        = sk_reuseport_is_valid_access,
10100         .convert_ctx_access     = sk_reuseport_convert_ctx_access,
10101 };
10102
10103 const struct bpf_prog_ops sk_reuseport_prog_ops = {
10104 };
10105
10106 DEFINE_STATIC_KEY_FALSE(bpf_sk_lookup_enabled);
10107 EXPORT_SYMBOL(bpf_sk_lookup_enabled);
10108
10109 BPF_CALL_3(bpf_sk_lookup_assign, struct bpf_sk_lookup_kern *, ctx,
10110            struct sock *, sk, u64, flags)
10111 {
10112         if (unlikely(flags & ~(BPF_SK_LOOKUP_F_REPLACE |
10113                                BPF_SK_LOOKUP_F_NO_REUSEPORT)))
10114                 return -EINVAL;
10115         if (unlikely(sk && sk_is_refcounted(sk)))
10116                 return -ESOCKTNOSUPPORT; /* reject non-RCU freed sockets */
10117         if (unlikely(sk && sk->sk_state == TCP_ESTABLISHED))
10118                 return -ESOCKTNOSUPPORT; /* reject connected sockets */
10119
10120         /* Check if socket is suitable for packet L3/L4 protocol */
10121         if (sk && sk->sk_protocol != ctx->protocol)
10122                 return -EPROTOTYPE;
10123         if (sk && sk->sk_family != ctx->family &&
10124             (sk->sk_family == AF_INET || ipv6_only_sock(sk)))
10125                 return -EAFNOSUPPORT;
10126
10127         if (ctx->selected_sk && !(flags & BPF_SK_LOOKUP_F_REPLACE))
10128                 return -EEXIST;
10129
10130         /* Select socket as lookup result */
10131         ctx->selected_sk = sk;
10132         ctx->no_reuseport = flags & BPF_SK_LOOKUP_F_NO_REUSEPORT;
10133         return 0;
10134 }
10135
10136 static const struct bpf_func_proto bpf_sk_lookup_assign_proto = {
10137         .func           = bpf_sk_lookup_assign,
10138         .gpl_only       = false,
10139         .ret_type       = RET_INTEGER,
10140         .arg1_type      = ARG_PTR_TO_CTX,
10141         .arg2_type      = ARG_PTR_TO_SOCKET_OR_NULL,
10142         .arg3_type      = ARG_ANYTHING,
10143 };
10144
10145 static const struct bpf_func_proto *
10146 sk_lookup_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
10147 {
10148         switch (func_id) {
10149         case BPF_FUNC_perf_event_output:
10150                 return &bpf_event_output_data_proto;
10151         case BPF_FUNC_sk_assign:
10152                 return &bpf_sk_lookup_assign_proto;
10153         case BPF_FUNC_sk_release:
10154                 return &bpf_sk_release_proto;
10155         default:
10156                 return bpf_sk_base_func_proto(func_id);
10157         }
10158 }
10159
10160 static bool sk_lookup_is_valid_access(int off, int size,
10161                                       enum bpf_access_type type,
10162                                       const struct bpf_prog *prog,
10163                                       struct bpf_insn_access_aux *info)
10164 {
10165         if (off < 0 || off >= sizeof(struct bpf_sk_lookup))
10166                 return false;
10167         if (off % size != 0)
10168                 return false;
10169         if (type != BPF_READ)
10170                 return false;
10171
10172         switch (off) {
10173         case offsetof(struct bpf_sk_lookup, sk):
10174                 info->reg_type = PTR_TO_SOCKET_OR_NULL;
10175                 return size == sizeof(__u64);
10176
10177         case bpf_ctx_range(struct bpf_sk_lookup, family):
10178         case bpf_ctx_range(struct bpf_sk_lookup, protocol):
10179         case bpf_ctx_range(struct bpf_sk_lookup, remote_ip4):
10180         case bpf_ctx_range(struct bpf_sk_lookup, local_ip4):
10181         case bpf_ctx_range_till(struct bpf_sk_lookup, remote_ip6[0], remote_ip6[3]):
10182         case bpf_ctx_range_till(struct bpf_sk_lookup, local_ip6[0], local_ip6[3]):
10183         case bpf_ctx_range(struct bpf_sk_lookup, remote_port):
10184         case bpf_ctx_range(struct bpf_sk_lookup, local_port):
10185                 bpf_ctx_record_field_size(info, sizeof(__u32));
10186                 return bpf_ctx_narrow_access_ok(off, size, sizeof(__u32));
10187
10188         default:
10189                 return false;
10190         }
10191 }
10192
10193 static u32 sk_lookup_convert_ctx_access(enum bpf_access_type type,
10194                                         const struct bpf_insn *si,
10195                                         struct bpf_insn *insn_buf,
10196                                         struct bpf_prog *prog,
10197                                         u32 *target_size)
10198 {
10199         struct bpf_insn *insn = insn_buf;
10200
10201         switch (si->off) {
10202         case offsetof(struct bpf_sk_lookup, sk):
10203                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
10204                                       offsetof(struct bpf_sk_lookup_kern, selected_sk));
10205                 break;
10206
10207         case offsetof(struct bpf_sk_lookup, family):
10208                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10209                                       bpf_target_off(struct bpf_sk_lookup_kern,
10210                                                      family, 2, target_size));
10211                 break;
10212
10213         case offsetof(struct bpf_sk_lookup, protocol):
10214                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10215                                       bpf_target_off(struct bpf_sk_lookup_kern,
10216                                                      protocol, 2, target_size));
10217                 break;
10218
10219         case offsetof(struct bpf_sk_lookup, remote_ip4):
10220                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
10221                                       bpf_target_off(struct bpf_sk_lookup_kern,
10222                                                      v4.saddr, 4, target_size));
10223                 break;
10224
10225         case offsetof(struct bpf_sk_lookup, local_ip4):
10226                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->src_reg,
10227                                       bpf_target_off(struct bpf_sk_lookup_kern,
10228                                                      v4.daddr, 4, target_size));
10229                 break;
10230
10231         case bpf_ctx_range_till(struct bpf_sk_lookup,
10232                                 remote_ip6[0], remote_ip6[3]): {
10233 #if IS_ENABLED(CONFIG_IPV6)
10234                 int off = si->off;
10235
10236                 off -= offsetof(struct bpf_sk_lookup, remote_ip6[0]);
10237                 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size);
10238                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
10239                                       offsetof(struct bpf_sk_lookup_kern, v6.saddr));
10240                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10241                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off);
10242 #else
10243                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10244 #endif
10245                 break;
10246         }
10247         case bpf_ctx_range_till(struct bpf_sk_lookup,
10248                                 local_ip6[0], local_ip6[3]): {
10249 #if IS_ENABLED(CONFIG_IPV6)
10250                 int off = si->off;
10251
10252                 off -= offsetof(struct bpf_sk_lookup, local_ip6[0]);
10253                 off += bpf_target_off(struct in6_addr, s6_addr32[0], 4, target_size);
10254                 *insn++ = BPF_LDX_MEM(BPF_SIZEOF(void *), si->dst_reg, si->src_reg,
10255                                       offsetof(struct bpf_sk_lookup_kern, v6.daddr));
10256                 *insn++ = BPF_JMP_IMM(BPF_JEQ, si->dst_reg, 0, 1);
10257                 *insn++ = BPF_LDX_MEM(BPF_W, si->dst_reg, si->dst_reg, off);
10258 #else
10259                 *insn++ = BPF_MOV32_IMM(si->dst_reg, 0);
10260 #endif
10261                 break;
10262         }
10263         case offsetof(struct bpf_sk_lookup, remote_port):
10264                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10265                                       bpf_target_off(struct bpf_sk_lookup_kern,
10266                                                      sport, 2, target_size));
10267                 break;
10268
10269         case offsetof(struct bpf_sk_lookup, local_port):
10270                 *insn++ = BPF_LDX_MEM(BPF_H, si->dst_reg, si->src_reg,
10271                                       bpf_target_off(struct bpf_sk_lookup_kern,
10272                                                      dport, 2, target_size));
10273                 break;
10274         }
10275
10276         return insn - insn_buf;
10277 }
10278
10279 const struct bpf_prog_ops sk_lookup_prog_ops = {
10280 };
10281
10282 const struct bpf_verifier_ops sk_lookup_verifier_ops = {
10283         .get_func_proto         = sk_lookup_func_proto,
10284         .is_valid_access        = sk_lookup_is_valid_access,
10285         .convert_ctx_access     = sk_lookup_convert_ctx_access,
10286 };
10287
10288 #endif /* CONFIG_INET */
10289
10290 DEFINE_BPF_DISPATCHER(xdp)
10291
10292 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog)
10293 {
10294         bpf_dispatcher_change_prog(BPF_DISPATCHER_PTR(xdp), prev_prog, prog);
10295 }
10296
10297 #ifdef CONFIG_DEBUG_INFO_BTF
10298 BTF_ID_LIST_GLOBAL(btf_sock_ids)
10299 #define BTF_SOCK_TYPE(name, type) BTF_ID(struct, type)
10300 BTF_SOCK_TYPE_xxx
10301 #undef BTF_SOCK_TYPE
10302 #else
10303 u32 btf_sock_ids[MAX_BTF_SOCK_TYPE];
10304 #endif
10305
10306 BPF_CALL_1(bpf_skc_to_tcp6_sock, struct sock *, sk)
10307 {
10308         /* tcp6_sock type is not generated in dwarf and hence btf,
10309          * trigger an explicit type generation here.
10310          */
10311         BTF_TYPE_EMIT(struct tcp6_sock);
10312         if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP &&
10313             sk->sk_family == AF_INET6)
10314                 return (unsigned long)sk;
10315
10316         return (unsigned long)NULL;
10317 }
10318
10319 const struct bpf_func_proto bpf_skc_to_tcp6_sock_proto = {
10320         .func                   = bpf_skc_to_tcp6_sock,
10321         .gpl_only               = false,
10322         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10323         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10324         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP6],
10325 };
10326
10327 BPF_CALL_1(bpf_skc_to_tcp_sock, struct sock *, sk)
10328 {
10329         if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_TCP)
10330                 return (unsigned long)sk;
10331
10332         return (unsigned long)NULL;
10333 }
10334
10335 const struct bpf_func_proto bpf_skc_to_tcp_sock_proto = {
10336         .func                   = bpf_skc_to_tcp_sock,
10337         .gpl_only               = false,
10338         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10339         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10340         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP],
10341 };
10342
10343 BPF_CALL_1(bpf_skc_to_tcp_timewait_sock, struct sock *, sk)
10344 {
10345         /* BTF types for tcp_timewait_sock and inet_timewait_sock are not
10346          * generated if CONFIG_INET=n. Trigger an explicit generation here.
10347          */
10348         BTF_TYPE_EMIT(struct inet_timewait_sock);
10349         BTF_TYPE_EMIT(struct tcp_timewait_sock);
10350
10351 #ifdef CONFIG_INET
10352         if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_TIME_WAIT)
10353                 return (unsigned long)sk;
10354 #endif
10355
10356 #if IS_BUILTIN(CONFIG_IPV6)
10357         if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_TIME_WAIT)
10358                 return (unsigned long)sk;
10359 #endif
10360
10361         return (unsigned long)NULL;
10362 }
10363
10364 const struct bpf_func_proto bpf_skc_to_tcp_timewait_sock_proto = {
10365         .func                   = bpf_skc_to_tcp_timewait_sock,
10366         .gpl_only               = false,
10367         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10368         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10369         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP_TW],
10370 };
10371
10372 BPF_CALL_1(bpf_skc_to_tcp_request_sock, struct sock *, sk)
10373 {
10374 #ifdef CONFIG_INET
10375         if (sk && sk->sk_prot == &tcp_prot && sk->sk_state == TCP_NEW_SYN_RECV)
10376                 return (unsigned long)sk;
10377 #endif
10378
10379 #if IS_BUILTIN(CONFIG_IPV6)
10380         if (sk && sk->sk_prot == &tcpv6_prot && sk->sk_state == TCP_NEW_SYN_RECV)
10381                 return (unsigned long)sk;
10382 #endif
10383
10384         return (unsigned long)NULL;
10385 }
10386
10387 const struct bpf_func_proto bpf_skc_to_tcp_request_sock_proto = {
10388         .func                   = bpf_skc_to_tcp_request_sock,
10389         .gpl_only               = false,
10390         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10391         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10392         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_TCP_REQ],
10393 };
10394
10395 BPF_CALL_1(bpf_skc_to_udp6_sock, struct sock *, sk)
10396 {
10397         /* udp6_sock type is not generated in dwarf and hence btf,
10398          * trigger an explicit type generation here.
10399          */
10400         BTF_TYPE_EMIT(struct udp6_sock);
10401         if (sk && sk_fullsock(sk) && sk->sk_protocol == IPPROTO_UDP &&
10402             sk->sk_type == SOCK_DGRAM && sk->sk_family == AF_INET6)
10403                 return (unsigned long)sk;
10404
10405         return (unsigned long)NULL;
10406 }
10407
10408 const struct bpf_func_proto bpf_skc_to_udp6_sock_proto = {
10409         .func                   = bpf_skc_to_udp6_sock,
10410         .gpl_only               = false,
10411         .ret_type               = RET_PTR_TO_BTF_ID_OR_NULL,
10412         .arg1_type              = ARG_PTR_TO_BTF_ID_SOCK_COMMON,
10413         .ret_btf_id             = &btf_sock_ids[BTF_SOCK_TYPE_UDP6],
10414 };
10415
10416 BPF_CALL_1(bpf_sock_from_file, struct file *, file)
10417 {
10418         return (unsigned long)sock_from_file(file);
10419 }
10420
10421 BTF_ID_LIST(bpf_sock_from_file_btf_ids)
10422 BTF_ID(struct, socket)
10423 BTF_ID(struct, file)
10424
10425 const struct bpf_func_proto bpf_sock_from_file_proto = {
10426         .func           = bpf_sock_from_file,
10427         .gpl_only       = false,
10428         .ret_type       = RET_PTR_TO_BTF_ID_OR_NULL,
10429         .ret_btf_id     = &bpf_sock_from_file_btf_ids[0],
10430         .arg1_type      = ARG_PTR_TO_BTF_ID,
10431         .arg1_btf_id    = &bpf_sock_from_file_btf_ids[1],
10432 };
10433
10434 static const struct bpf_func_proto *
10435 bpf_sk_base_func_proto(enum bpf_func_id func_id)
10436 {
10437         const struct bpf_func_proto *func;
10438
10439         switch (func_id) {
10440         case BPF_FUNC_skc_to_tcp6_sock:
10441                 func = &bpf_skc_to_tcp6_sock_proto;
10442                 break;
10443         case BPF_FUNC_skc_to_tcp_sock:
10444                 func = &bpf_skc_to_tcp_sock_proto;
10445                 break;
10446         case BPF_FUNC_skc_to_tcp_timewait_sock:
10447                 func = &bpf_skc_to_tcp_timewait_sock_proto;
10448                 break;
10449         case BPF_FUNC_skc_to_tcp_request_sock:
10450                 func = &bpf_skc_to_tcp_request_sock_proto;
10451                 break;
10452         case BPF_FUNC_skc_to_udp6_sock:
10453                 func = &bpf_skc_to_udp6_sock_proto;
10454                 break;
10455         default:
10456                 return bpf_base_func_proto(func_id);
10457         }
10458
10459         if (!perfmon_capable())
10460                 return NULL;
10461
10462         return func;
10463 }