include/linux/filter.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Linux Socket Filter Data Structures
   4  */
   5 #ifndef __LINUX_FILTER_H__
   6 #define __LINUX_FILTER_H__
   7
   8 #include <stdarg.h>
   9
  10 #include <linux/atomic.h>
  11 #include <linux/refcount.h>
  12 #include <linux/compat.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/linkage.h>
  15 #include <linux/printk.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/sched.h>
  18 #include <linux/capability.h>
  19 #include <linux/cryptohash.h>
  20 #include <linux/set_memory.h>
  21 #include <linux/kallsyms.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/vmalloc.h>
  24
  25 #include <net/sch_generic.h>
  26
  27 #include <asm/byteorder.h>
  28 #include <uapi/linux/filter.h>
  29 #include <uapi/linux/bpf.h>
  30
  31 struct sk_buff;
  32 struct sock;
  33 struct seccomp_data;
  34 struct bpf_prog_aux;
  35 struct xdp_rxq_info;
  36 struct xdp_buff;
  37 struct sock_reuseport;
  38 struct ctl_table;
  39 struct ctl_table_header;
  40
  41 /* ArgX, context and stack frame pointer register positions. Note,
  42  * Arg1, Arg2, Arg3, etc are used as argument mappings of function
  43  * calls in BPF_CALL instruction.
  44  */
  45 #define BPF_REG_ARG1    BPF_REG_1
  46 #define BPF_REG_ARG2    BPF_REG_2
  47 #define BPF_REG_ARG3    BPF_REG_3
  48 #define BPF_REG_ARG4    BPF_REG_4
  49 #define BPF_REG_ARG5    BPF_REG_5
  50 #define BPF_REG_CTX     BPF_REG_6
  51 #define BPF_REG_FP      BPF_REG_10
  52
  53 /* Additional register mappings for converted user programs. */
  54 #define BPF_REG_A       BPF_REG_0
  55 #define BPF_REG_X       BPF_REG_7
  56 #define BPF_REG_TMP     BPF_REG_2       /* scratch reg */
  57 #define BPF_REG_D       BPF_REG_8       /* data, callee-saved */
  58 #define BPF_REG_H       BPF_REG_9       /* hlen, callee-saved */
  59
  60 /* Kernel hidden auxiliary/helper register. */
  61 #define BPF_REG_AX              MAX_BPF_REG
  62 #define MAX_BPF_EXT_REG         (MAX_BPF_REG + 1)
  63 #define MAX_BPF_JIT_REG         MAX_BPF_EXT_REG
  64
  65 /* unused opcode to mark special call to bpf_tail_call() helper */
  66 #define BPF_TAIL_CALL   0xf0
  67
  68 /* unused opcode to mark special load instruction. Same as BPF_ABS */
  69 #define BPF_PROBE_MEM   0x20
  70
  71 /* unused opcode to mark call to interpreter with arguments */
  72 #define BPF_CALL_ARGS   0xe0
  73
  74 /* As per nm, we expose JITed images as text (code) section for
  75  * kallsyms. That way, tools like perf can find it to match
  76  * addresses.
  77  */
  78 #define BPF_SYM_ELF_TYPE        't'
  79
  80 /* BPF program can access up to 512 bytes of stack space. */
  81 #define MAX_BPF_STACK   512
  82
  83 /* Helper macros for filter block array initializers. */
  84
  85 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
  86
  87 #define BPF_ALU64_REG(OP, DST, SRC)                             \
  88         ((struct bpf_insn) {                                    \
  89                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
  90                 .dst_reg = DST,                                 \
  91                 .src_reg = SRC,                                 \
  92                 .off   = 0,                                     \
  93                 .imm   = 0 })
  94
  95 #define BPF_ALU32_REG(OP, DST, SRC)                             \
  96         ((struct bpf_insn) {                                    \
  97                 .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
  98                 .dst_reg = DST,                                 \
  99                 .src_reg = SRC,                                 \
 100                 .off   = 0,                                     \
 101                 .imm   = 0 })
 102
 103 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 104
 105 #define BPF_ALU64_IMM(OP, DST, IMM)                             \
 106         ((struct bpf_insn) {                                    \
 107                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
 108                 .dst_reg = DST,                                 \
 109                 .src_reg = 0,                                   \
 110                 .off   = 0,                                     \
 111                 .imm   = IMM })
 112
 113 #define BPF_ALU32_IMM(OP, DST, IMM)                             \
 114         ((struct bpf_insn) {                                    \
 115                 .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
 116                 .dst_reg = DST,                                 \
 117                 .src_reg = 0,                                   \
 118                 .off   = 0,                                     \
 119                 .imm   = IMM })
 120
 121 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
 122
 123 #define BPF_ENDIAN(TYPE, DST, LEN)                              \
 124         ((struct bpf_insn) {                                    \
 125                 .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
 126                 .dst_reg = DST,                                 \
 127                 .src_reg = 0,                                   \
 128                 .off   = 0,                                     \
 129                 .imm   = LEN })
 130
 131 /* Short form of mov, dst_reg = src_reg */
 132
 133 #define BPF_MOV64_REG(DST, SRC)                                 \
 134         ((struct bpf_insn) {                                    \
 135                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 136                 .dst_reg = DST,                                 \
 137                 .src_reg = SRC,                                 \
 138                 .off   = 0,                                     \
 139                 .imm   = 0 })
 140
 141 #define BPF_MOV32_REG(DST, SRC)                                 \
 142         ((struct bpf_insn) {                                    \
 143                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 144                 .dst_reg = DST,                                 \
 145                 .src_reg = SRC,                                 \
 146                 .off   = 0,                                     \
 147                 .imm   = 0 })
 148
 149 /* Short form of mov, dst_reg = imm32 */
 150
 151 #define BPF_MOV64_IMM(DST, IMM)                                 \
 152         ((struct bpf_insn) {                                    \
 153                 .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
 154                 .dst_reg = DST,                                 \
 155                 .src_reg = 0,                                   \
 156                 .off   = 0,                                     \
 157                 .imm   = IMM })
 158
 159 #define BPF_MOV32_IMM(DST, IMM)                                 \
 160         ((struct bpf_insn) {                                    \
 161                 .code  = BPF_ALU | BPF_MOV | BPF_K,             \
 162                 .dst_reg = DST,                                 \
 163                 .src_reg = 0,                                   \
 164                 .off   = 0,                                     \
 165                 .imm   = IMM })
 166
 167 /* Special form of mov32, used for doing explicit zero extension on dst. */
 168 #define BPF_ZEXT_REG(DST)                                       \
 169         ((struct bpf_insn) {                                    \
 170                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 171                 .dst_reg = DST,                                 \
 172                 .src_reg = DST,                                 \
 173                 .off   = 0,                                     \
 174                 .imm   = 1 })
 175
 176 static inline bool insn_is_zext(const struct bpf_insn *insn)
 177 {
 178         return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
 179 }
 180
 181 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
 182 #define BPF_LD_IMM64(DST, IMM)                                  \
 183         BPF_LD_IMM64_RAW(DST, 0, IMM)
 184
 185 #define BPF_LD_IMM64_RAW(DST, SRC, IMM)                         \
 186         ((struct bpf_insn) {                                    \
 187                 .code  = BPF_LD | BPF_DW | BPF_IMM,             \
 188                 .dst_reg = DST,                                 \
 189                 .src_reg = SRC,                                 \
 190                 .off   = 0,                                     \
 191                 .imm   = (__u32) (IMM) }),                      \
 192         ((struct bpf_insn) {                                    \
 193                 .code  = 0, /* zero is reserved opcode */       \
 194                 .dst_reg = 0,                                   \
 195                 .src_reg = 0,                                   \
 196                 .off   = 0,                                     \
 197                 .imm   = ((__u64) (IMM)) >> 32 })
 198
 199 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
 200 #define BPF_LD_MAP_FD(DST, MAP_FD)                              \
 201         BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
 202
 203 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
 204
 205 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)                      \
 206         ((struct bpf_insn) {                                    \
 207                 .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
 208                 .dst_reg = DST,                                 \
 209                 .src_reg = SRC,                                 \
 210                 .off   = 0,                                     \
 211                 .imm   = IMM })
 212
 213 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)                      \
 214         ((struct bpf_insn) {                                    \
 215                 .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
 216                 .dst_reg = DST,                                 \
 217                 .src_reg = SRC,                                 \
 218                 .off   = 0,                                     \
 219                 .imm   = IMM })
 220
 221 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
 222
 223 #define BPF_LD_ABS(SIZE, IMM)                                   \
 224         ((struct bpf_insn) {                                    \
 225                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
 226                 .dst_reg = 0,                                   \
 227                 .src_reg = 0,                                   \
 228                 .off   = 0,                                     \
 229                 .imm   = IMM })
 230
 231 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
 232
 233 #define BPF_LD_IND(SIZE, SRC, IMM)                              \
 234         ((struct bpf_insn) {                                    \
 235                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
 236                 .dst_reg = 0,                                   \
 237                 .src_reg = SRC,                                 \
 238                 .off   = 0,                                     \
 239                 .imm   = IMM })
 240
 241 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
 242
 243 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)                        \
 244         ((struct bpf_insn) {                                    \
 245                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
 246                 .dst_reg = DST,                                 \
 247                 .src_reg = SRC,                                 \
 248                 .off   = OFF,                                   \
 249                 .imm   = 0 })
 250
 251 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
 252
 253 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)                        \
 254         ((struct bpf_insn) {                                    \
 255                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
 256                 .dst_reg = DST,                                 \
 257                 .src_reg = SRC,                                 \
 258                 .off   = OFF,                                   \
 259                 .imm   = 0 })
 260
 261 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
 262
 263 #define BPF_STX_XADD(SIZE, DST, SRC, OFF)                       \
 264         ((struct bpf_insn) {                                    \
 265                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,   \
 266                 .dst_reg = DST,                                 \
 267                 .src_reg = SRC,                                 \
 268                 .off   = OFF,                                   \
 269                 .imm   = 0 })
 270
 271 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
 272
 273 #define BPF_ST_MEM(SIZE, DST, OFF, IMM)                         \
 274         ((struct bpf_insn) {                                    \
 275                 .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
 276                 .dst_reg = DST,                                 \
 277                 .src_reg = 0,                                   \
 278                 .off   = OFF,                                   \
 279                 .imm   = IMM })
 280
 281 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
 282
 283 #define BPF_JMP_REG(OP, DST, SRC, OFF)                          \
 284         ((struct bpf_insn) {                                    \
 285                 .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
 286                 .dst_reg = DST,                                 \
 287                 .src_reg = SRC,                                 \
 288                 .off   = OFF,                                   \
 289                 .imm   = 0 })
 290
 291 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
 292
 293 #define BPF_JMP_IMM(OP, DST, IMM, OFF)                          \
 294         ((struct bpf_insn) {                                    \
 295                 .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
 296                 .dst_reg = DST,                                 \
 297                 .src_reg = 0,                                   \
 298                 .off   = OFF,                                   \
 299                 .imm   = IMM })
 300
 301 /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
 302
 303 #define BPF_JMP32_REG(OP, DST, SRC, OFF)                        \
 304         ((struct bpf_insn) {                                    \
 305                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_X,        \
 306                 .dst_reg = DST,                                 \
 307                 .src_reg = SRC,                                 \
 308                 .off   = OFF,                                   \
 309                 .imm   = 0 })
 310
 311 /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
 312
 313 #define BPF_JMP32_IMM(OP, DST, IMM, OFF)                        \
 314         ((struct bpf_insn) {                                    \
 315                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_K,        \
 316                 .dst_reg = DST,                                 \
 317                 .src_reg = 0,                                   \
 318                 .off   = OFF,                                   \
 319                 .imm   = IMM })
 320
 321 /* Unconditional jumps, goto pc + off16 */
 322
 323 #define BPF_JMP_A(OFF)                                          \
 324         ((struct bpf_insn) {                                    \
 325                 .code  = BPF_JMP | BPF_JA,                      \
 326                 .dst_reg = 0,                                   \
 327                 .src_reg = 0,                                   \
 328                 .off   = OFF,                                   \
 329                 .imm   = 0 })
 330
 331 /* Relative call */
 332
 333 #define BPF_CALL_REL(TGT)                                       \
 334         ((struct bpf_insn) {                                    \
 335                 .code  = BPF_JMP | BPF_CALL,                    \
 336                 .dst_reg = 0,                                   \
 337                 .src_reg = BPF_PSEUDO_CALL,                     \
 338                 .off   = 0,                                     \
 339                 .imm   = TGT })
 340
 341 /* Function call */
 342
 343 #define BPF_CAST_CALL(x)                                        \
 344                 ((u64 (*)(u64, u64, u64, u64, u64))(x))
 345
 346 #define BPF_EMIT_CALL(FUNC)                                     \
 347         ((struct bpf_insn) {                                    \
 348                 .code  = BPF_JMP | BPF_CALL,                    \
 349                 .dst_reg = 0,                                   \
 350                 .src_reg = 0,                                   \
 351                 .off   = 0,                                     \
 352                 .imm   = ((FUNC) - __bpf_call_base) })
 353
 354 /* Raw code statement block */
 355
 356 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)                  \
 357         ((struct bpf_insn) {                                    \
 358                 .code  = CODE,                                  \
 359                 .dst_reg = DST,                                 \
 360                 .src_reg = SRC,                                 \
 361                 .off   = OFF,                                   \
 362                 .imm   = IMM })
 363
 364 /* Program exit */
 365
 366 #define BPF_EXIT_INSN()                                         \
 367         ((struct bpf_insn) {                                    \
 368                 .code  = BPF_JMP | BPF_EXIT,                    \
 369                 .dst_reg = 0,                                   \
 370                 .src_reg = 0,                                   \
 371                 .off   = 0,                                     \
 372                 .imm   = 0 })
 373
 374 /* Internal classic blocks for direct assignment */
 375
 376 #define __BPF_STMT(CODE, K)                                     \
 377         ((struct sock_filter) BPF_STMT(CODE, K))
 378
 379 #define __BPF_JUMP(CODE, K, JT, JF)                             \
 380         ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
 381
 382 #define bytes_to_bpf_size(bytes)                                \
 383 ({                                                              \
 384         int bpf_size = -EINVAL;                                 \
 385                                                                 \
 386         if (bytes == sizeof(u8))                                \
 387                 bpf_size = BPF_B;                               \
 388         else if (bytes == sizeof(u16))                          \
 389                 bpf_size = BPF_H;                               \
 390         else if (bytes == sizeof(u32))                          \
 391                 bpf_size = BPF_W;                               \
 392         else if (bytes == sizeof(u64))                          \
 393                 bpf_size = BPF_DW;                              \
 394                                                                 \
 395         bpf_size;                                               \
 396 })
 397
 398 #define bpf_size_to_bytes(bpf_size)                             \
 399 ({                                                              \
 400         int bytes = -EINVAL;                                    \
 401                                                                 \
 402         if (bpf_size == BPF_B)                                  \
 403                 bytes = sizeof(u8);                             \
 404         else if (bpf_size == BPF_H)                             \
 405                 bytes = sizeof(u16);                            \
 406         else if (bpf_size == BPF_W)                             \
 407                 bytes = sizeof(u32);                            \
 408         else if (bpf_size == BPF_DW)                            \
 409                 bytes = sizeof(u64);                            \
 410                                                                 \
 411         bytes;                                                  \
 412 })
 413
 414 #define BPF_SIZEOF(type)                                        \
 415         ({                                                      \
 416                 const int __size = bytes_to_bpf_size(sizeof(type)); \
 417                 BUILD_BUG_ON(__size < 0);                       \
 418                 __size;                                         \
 419         })
 420
 421 #define BPF_FIELD_SIZEOF(type, field)                           \
 422         ({                                                      \
 423                 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
 424                 BUILD_BUG_ON(__size < 0);                       \
 425                 __size;                                         \
 426         })
 427
 428 #define BPF_LDST_BYTES(insn)                                    \
 429         ({                                                      \
 430                 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
 431                 WARN_ON(__size < 0);                            \
 432                 __size;                                         \
 433         })
 434
 435 #define __BPF_MAP_0(m, v, ...) v
 436 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
 437 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
 438 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
 439 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
 440 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
 441
 442 #define __BPF_REG_0(...) __BPF_PAD(5)
 443 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
 444 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
 445 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
 446 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
 447 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
 448
 449 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
 450 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
 451
 452 #define __BPF_CAST(t, a)                                                       \
 453         (__force t)                                                            \
 454         (__force                                                               \
 455          typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
 456                                       (unsigned long)0, (t)0))) a
 457 #define __BPF_V void
 458 #define __BPF_N
 459
 460 #define __BPF_DECL_ARGS(t, a) t   a
 461 #define __BPF_DECL_REGS(t, a) u64 a
 462
 463 #define __BPF_PAD(n)                                                           \
 464         __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
 465                   u64, __ur_3, u64, __ur_4, u64, __ur_5)
 466
 467 #define BPF_CALL_x(x, name, ...)                                               \
 468         static __always_inline                                                 \
 469         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
 470         typedef u64 (*btf_##name)(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
 471         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));         \
 472         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))          \
 473         {                                                                      \
 474                 return ((btf_##name)____##name)(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
 475         }                                                                      \
 476         static __always_inline                                                 \
 477         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
 478
 479 #define BPF_CALL_0(name, ...)   BPF_CALL_x(0, name, __VA_ARGS__)
 480 #define BPF_CALL_1(name, ...)   BPF_CALL_x(1, name, __VA_ARGS__)
 481 #define BPF_CALL_2(name, ...)   BPF_CALL_x(2, name, __VA_ARGS__)
 482 #define BPF_CALL_3(name, ...)   BPF_CALL_x(3, name, __VA_ARGS__)
 483 #define BPF_CALL_4(name, ...)   BPF_CALL_x(4, name, __VA_ARGS__)
 484 #define BPF_CALL_5(name, ...)   BPF_CALL_x(5, name, __VA_ARGS__)
 485
 486 #define bpf_ctx_range(TYPE, MEMBER)                                             \
 487         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 488 #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2)                              \
 489         offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
 490 #if BITS_PER_LONG == 64
 491 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 492         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 493 #else
 494 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 495         offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
 496 #endif /* BITS_PER_LONG == 64 */
 497
 498 #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE)                            \
 499         ({                                                                      \
 500                 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE));             \
 501                 *(PTR_SIZE) = (SIZE);                                           \
 502                 offsetof(TYPE, MEMBER);                                         \
 503         })
 504
 505 #ifdef CONFIG_COMPAT
 506 /* A struct sock_filter is architecture independent. */
 507 struct compat_sock_fprog {
 508         u16             len;
 509         compat_uptr_t   filter; /* struct sock_filter * */
 510 };
 511 #endif
 512
 513 struct sock_fprog_kern {
 514         u16                     len;
 515         struct sock_filter      *filter;
 516 };
 517
 518 /* Some arches need doubleword alignment for their instructions and/or data */
 519 #define BPF_IMAGE_ALIGNMENT 8
 520
 521 struct bpf_binary_header {
 522         u32 pages;
 523         u8 image[] __aligned(BPF_IMAGE_ALIGNMENT);
 524 };
 525
 526 struct bpf_prog {
 527         u16                     pages;          /* Number of allocated pages */
 528         u16                     jited:1,        /* Is our filter JIT'ed? */
 529                                 jit_requested:1,/* archs need to JIT the prog */
 530                                 gpl_compatible:1, /* Is filter GPL compatible? */
 531                                 cb_access:1,    /* Is control block accessed? */
 532                                 dst_needed:1,   /* Do we need dst entry? */
 533                                 blinded:1,      /* Was blinded */
 534                                 is_func:1,      /* program is a bpf function */
 535                                 kprobe_override:1, /* Do we override a kprobe? */
 536                                 has_callchain_buf:1, /* callchain buffer allocated? */
 537                                 enforce_expected_attach_type:1; /* Enforce expected_attach_type checking at attach time */
 538         enum bpf_prog_type      type;           /* Type of BPF program */
 539         enum bpf_attach_type    expected_attach_type; /* For some prog types */
 540         u32                     len;            /* Number of filter blocks */
 541         u32                     jited_len;      /* Size of jited insns in bytes */
 542         u8                      tag[BPF_TAG_SIZE];
 543         struct bpf_prog_aux     *aux;           /* Auxiliary fields */
 544         struct sock_fprog_kern  *orig_prog;     /* Original BPF program */
 545         unsigned int            (*bpf_func)(const void *ctx,
 546                                             const struct bpf_insn *insn);
 547         /* Instructions for interpreter */
 548         union {
 549                 struct sock_filter      insns[0];
 550                 struct bpf_insn         insnsi[0];
 551         };
 552 };
 553
 554 struct sk_filter {
 555         refcount_t      refcnt;
 556         struct rcu_head rcu;
 557         struct bpf_prog *prog;
 558 };
 559
 560 DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
 561
 562 #define BPF_PROG_RUN(prog, ctx) ({                              \
 563         u32 ret;                                                \
 564         cant_sleep();                                           \
 565         if (static_branch_unlikely(&bpf_stats_enabled_key)) {   \
 566                 struct bpf_prog_stats *stats;                   \
 567                 u64 start = sched_clock();                      \
 568                 ret = (*(prog)->bpf_func)(ctx, (prog)->insnsi); \
 569                 stats = this_cpu_ptr(prog->aux->stats);         \
 570                 u64_stats_update_begin(&stats->syncp);          \
 571                 stats->cnt++;                                   \
 572                 stats->nsecs += sched_clock() - start;          \
 573                 u64_stats_update_end(&stats->syncp);            \
 574         } else {                                                \
 575                 ret = (*(prog)->bpf_func)(ctx, (prog)->insnsi); \
 576         }                                                       \
 577         ret; })
 578
 579 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
 580
 581 struct bpf_skb_data_end {
 582         struct qdisc_skb_cb qdisc_cb;
 583         void *data_meta;
 584         void *data_end;
 585 };
 586
 587 struct bpf_redirect_info {
 588         u32 flags;
 589         u32 tgt_index;
 590         void *tgt_value;
 591         struct bpf_map *map;
 592         struct bpf_map *map_to_flush;
 593         u32 kern_flags;
 594 };
 595
 596 DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
 597
 598 /* flags for bpf_redirect_info kern_flags */
 599 #define BPF_RI_F_RF_NO_DIRECT   BIT(0)  /* no napi_direct on return_frame */
 600
 601 /* Compute the linear packet data range [data, data_end) which
 602  * will be accessed by various program types (cls_bpf, act_bpf,
 603  * lwt, ...). Subsystems allowing direct data access must (!)
 604  * ensure that cb[] area can be written to when BPF program is
 605  * invoked (otherwise cb[] save/restore is necessary).
 606  */
 607 static inline void bpf_compute_data_pointers(struct sk_buff *skb)
 608 {
 609         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 610
 611         BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
 612         cb->data_meta = skb->data - skb_metadata_len(skb);
 613         cb->data_end  = skb->data + skb_headlen(skb);
 614 }
 615
 616 /* Similar to bpf_compute_data_pointers(), except that save orginal
 617  * data in cb->data and cb->meta_data for restore.
 618  */
 619 static inline void bpf_compute_and_save_data_end(
 620         struct sk_buff *skb, void **saved_data_end)
 621 {
 622         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 623
 624         *saved_data_end = cb->data_end;
 625         cb->data_end  = skb->data + skb_headlen(skb);
 626 }
 627
 628 /* Restore data saved by bpf_compute_data_pointers(). */
 629 static inline void bpf_restore_data_end(
 630         struct sk_buff *skb, void *saved_data_end)
 631 {
 632         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 633
 634         cb->data_end = saved_data_end;
 635 }
 636
 637 static inline u8 *bpf_skb_cb(struct sk_buff *skb)
 638 {
 639         /* eBPF programs may read/write skb->cb[] area to transfer meta
 640          * data between tail calls. Since this also needs to work with
 641          * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
 642          *
 643          * In some socket filter cases, the cb unfortunately needs to be
 644          * saved/restored so that protocol specific skb->cb[] data won't
 645          * be lost. In any case, due to unpriviledged eBPF programs
 646          * attached to sockets, we need to clear the bpf_skb_cb() area
 647          * to not leak previous contents to user space.
 648          */
 649         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
 650         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
 651                      FIELD_SIZEOF(struct qdisc_skb_cb, data));
 652
 653         return qdisc_skb_cb(skb)->data;
 654 }
 655
 656 static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
 657                                          struct sk_buff *skb)
 658 {
 659         u8 *cb_data = bpf_skb_cb(skb);
 660         u8 cb_saved[BPF_SKB_CB_LEN];
 661         u32 res;
 662
 663         if (unlikely(prog->cb_access)) {
 664                 memcpy(cb_saved, cb_data, sizeof(cb_saved));
 665                 memset(cb_data, 0, sizeof(cb_saved));
 666         }
 667
 668         res = BPF_PROG_RUN(prog, skb);
 669
 670         if (unlikely(prog->cb_access))
 671                 memcpy(cb_data, cb_saved, sizeof(cb_saved));
 672
 673         return res;
 674 }
 675
 676 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
 677                                        struct sk_buff *skb)
 678 {
 679         u32 res;
 680
 681         preempt_disable();
 682         res = __bpf_prog_run_save_cb(prog, skb);
 683         preempt_enable();
 684         return res;
 685 }
 686
 687 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
 688                                         struct sk_buff *skb)
 689 {
 690         u8 *cb_data = bpf_skb_cb(skb);
 691         u32 res;
 692
 693         if (unlikely(prog->cb_access))
 694                 memset(cb_data, 0, BPF_SKB_CB_LEN);
 695
 696         preempt_disable();
 697         res = BPF_PROG_RUN(prog, skb);
 698         preempt_enable();
 699         return res;
 700 }
 701
 702 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
 703                                             struct xdp_buff *xdp)
 704 {
 705         /* Caller needs to hold rcu_read_lock() (!), otherwise program
 706          * can be released while still running, or map elements could be
 707          * freed early while still having concurrent users. XDP fastpath
 708          * already takes rcu_read_lock() when fetching the program, so
 709          * it's not necessary here anymore.
 710          */
 711         return BPF_PROG_RUN(prog, xdp);
 712 }
 713
 714 static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
 715 {
 716         return prog->len * sizeof(struct bpf_insn);
 717 }
 718
 719 static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
 720 {
 721         return round_up(bpf_prog_insn_size(prog) +
 722                         sizeof(__be64) + 1, SHA_MESSAGE_BYTES);
 723 }
 724
 725 static inline unsigned int bpf_prog_size(unsigned int proglen)
 726 {
 727         return max(sizeof(struct bpf_prog),
 728                    offsetof(struct bpf_prog, insns[proglen]));
 729 }
 730
 731 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
 732 {
 733         /* When classic BPF programs have been loaded and the arch
 734          * does not have a classic BPF JIT (anymore), they have been
 735          * converted via bpf_migrate_filter() to eBPF and thus always
 736          * have an unspec program type.
 737          */
 738         return prog->type == BPF_PROG_TYPE_UNSPEC;
 739 }
 740
 741 static inline u32 bpf_ctx_off_adjust_machine(u32 size)
 742 {
 743         const u32 size_machine = sizeof(unsigned long);
 744
 745         if (size > size_machine && size % size_machine == 0)
 746                 size = size_machine;
 747
 748         return size;
 749 }
 750
 751 static inline bool
 752 bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
 753 {
 754         return size <= size_default && (size & (size - 1)) == 0;
 755 }
 756
 757 static inline u8
 758 bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
 759 {
 760         u8 access_off = off & (size_default - 1);
 761
 762 #ifdef __LITTLE_ENDIAN
 763         return access_off;
 764 #else
 765         return size_default - (access_off + size);
 766 #endif
 767 }
 768
 769 #define bpf_ctx_wide_access_ok(off, size, type, field)                  \
 770         (size == sizeof(__u64) &&                                       \
 771         off >= offsetof(type, field) &&                                 \
 772         off + sizeof(__u64) <= offsetofend(type, field) &&              \
 773         off % sizeof(__u64) == 0)
 774
 775 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
 776
 777 static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
 778 {
 779         set_vm_flush_reset_perms(fp);
 780         set_memory_ro((unsigned long)fp, fp->pages);
 781 }
 782
 783 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
 784 {
 785         set_vm_flush_reset_perms(hdr);
 786         set_memory_ro((unsigned long)hdr, hdr->pages);
 787         set_memory_x((unsigned long)hdr, hdr->pages);
 788 }
 789
 790 static inline struct bpf_binary_header *
 791 bpf_jit_binary_hdr(const struct bpf_prog *fp)
 792 {
 793         unsigned long real_start = (unsigned long)fp->bpf_func;
 794         unsigned long addr = real_start & PAGE_MASK;
 795
 796         return (void *)addr;
 797 }
 798
 799 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
 800 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
 801 {
 802         return sk_filter_trim_cap(sk, skb, 1);
 803 }
 804
 805 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
 806 void bpf_prog_free(struct bpf_prog *fp);
 807
 808 bool bpf_opcode_in_insntable(u8 code);
 809
 810 void bpf_prog_free_linfo(struct bpf_prog *prog);
 811 void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
 812                                const u32 *insn_to_jit_off);
 813 int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
 814 void bpf_prog_free_jited_linfo(struct bpf_prog *prog);
 815 void bpf_prog_free_unused_jited_linfo(struct bpf_prog *prog);
 816
 817 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
 818 struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
 819 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
 820                                   gfp_t gfp_extra_flags);
 821 void __bpf_prog_free(struct bpf_prog *fp);
 822
 823 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
 824 {
 825         __bpf_prog_free(fp);
 826 }
 827
 828 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
 829                                        unsigned int flen);
 830
 831 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
 832 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
 833                               bpf_aux_classic_check_t trans, bool save_orig);
 834 void bpf_prog_destroy(struct bpf_prog *fp);
 835
 836 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 837 int sk_attach_bpf(u32 ufd, struct sock *sk);
 838 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 839 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
 840 void sk_reuseport_prog_free(struct bpf_prog *prog);
 841 int sk_detach_filter(struct sock *sk);
 842 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
 843                   unsigned int len);
 844
 845 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
 846 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
 847
 848 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 849 #define __bpf_call_base_args \
 850         ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
 851          __bpf_call_base)
 852
 853 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
 854 void bpf_jit_compile(struct bpf_prog *prog);
 855 bool bpf_jit_needs_zext(void);
 856 bool bpf_helper_changes_pkt_data(void *func);
 857
 858 static inline bool bpf_dump_raw_ok(void)
 859 {
 860         /* Reconstruction of call-sites is dependent on kallsyms,
 861          * thus make dump the same restriction.
 862          */
 863         return kallsyms_show_value() == 1;
 864 }
 865
 866 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
 867                                        const struct bpf_insn *patch, u32 len);
 868 int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
 869
 870 void bpf_clear_redirect_map(struct bpf_map *map);
 871
 872 static inline bool xdp_return_frame_no_direct(void)
 873 {
 874         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 875
 876         return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
 877 }
 878
 879 static inline void xdp_set_return_frame_no_direct(void)
 880 {
 881         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 882
 883         ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
 884 }
 885
 886 static inline void xdp_clear_return_frame_no_direct(void)
 887 {
 888         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 889
 890         ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
 891 }
 892
 893 static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
 894                                  unsigned int pktlen)
 895 {
 896         unsigned int len;
 897
 898         if (unlikely(!(fwd->flags & IFF_UP)))
 899                 return -ENETDOWN;
 900
 901         len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
 902         if (pktlen > len)
 903                 return -EMSGSIZE;
 904
 905         return 0;
 906 }
 907
 908 /* The pair of xdp_do_redirect and xdp_do_flush_map MUST be called in the
 909  * same cpu context. Further for best results no more than a single map
 910  * for the do_redirect/do_flush pair should be used. This limitation is
 911  * because we only track one map and force a flush when the map changes.
 912  * This does not appear to be a real limitation for existing software.
 913  */
 914 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
 915                             struct xdp_buff *xdp, struct bpf_prog *prog);
 916 int xdp_do_redirect(struct net_device *dev,
 917                     struct xdp_buff *xdp,
 918                     struct bpf_prog *prog);
 919 void xdp_do_flush_map(void);
 920
 921 void bpf_warn_invalid_xdp_action(u32 act);
 922
 923 #ifdef CONFIG_INET
 924 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 925                                   struct bpf_prog *prog, struct sk_buff *skb,
 926                                   u32 hash);
 927 #else
 928 static inline struct sock *
 929 bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 930                      struct bpf_prog *prog, struct sk_buff *skb,
 931                      u32 hash)
 932 {
 933         return NULL;
 934 }
 935 #endif
 936
 937 #ifdef CONFIG_BPF_JIT
 938 extern int bpf_jit_enable;
 939 extern int bpf_jit_harden;
 940 extern int bpf_jit_kallsyms;
 941 extern long bpf_jit_limit;
 942
 943 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
 944
 945 struct bpf_binary_header *
 946 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
 947                      unsigned int alignment,
 948                      bpf_jit_fill_hole_t bpf_fill_ill_insns);
 949 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
 950 u64 bpf_jit_alloc_exec_limit(void);
 951 void *bpf_jit_alloc_exec(unsigned long size);
 952 void bpf_jit_free_exec(void *addr);
 953 void bpf_jit_free(struct bpf_prog *fp);
 954
 955 int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
 956                                 struct bpf_jit_poke_descriptor *poke);
 957
 958 int bpf_jit_get_func_addr(const struct bpf_prog *prog,
 959                           const struct bpf_insn *insn, bool extra_pass,
 960                           u64 *func_addr, bool *func_addr_fixed);
 961
 962 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
 963 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
 964
 965 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
 966                                 u32 pass, void *image)
 967 {
 968         pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
 969                proglen, pass, image, current->comm, task_pid_nr(current));
 970
 971         if (image)
 972                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
 973                                16, 1, image, proglen, false);
 974 }
 975
 976 static inline bool bpf_jit_is_ebpf(void)
 977 {
 978 # ifdef CONFIG_HAVE_EBPF_JIT
 979         return true;
 980 # else
 981         return false;
 982 # endif
 983 }
 984
 985 static inline bool ebpf_jit_enabled(void)
 986 {
 987         return bpf_jit_enable && bpf_jit_is_ebpf();
 988 }
 989
 990 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
 991 {
 992         return fp->jited && bpf_jit_is_ebpf();
 993 }
 994
 995 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
 996 {
 997         /* These are the prerequisites, should someone ever have the
 998          * idea to call blinding outside of them, we make sure to
 999          * bail out.
1000          */
1001         if (!bpf_jit_is_ebpf())
1002                 return false;
1003         if (!prog->jit_requested)
1004                 return false;
1005         if (!bpf_jit_harden)
1006                 return false;
1007         if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
1008                 return false;
1009
1010         return true;
1011 }
1012
1013 static inline bool bpf_jit_kallsyms_enabled(void)
1014 {
1015         /* There are a couple of corner cases where kallsyms should
1016          * not be enabled f.e. on hardening.
1017          */
1018         if (bpf_jit_harden)
1019                 return false;
1020         if (!bpf_jit_kallsyms)
1021                 return false;
1022         if (bpf_jit_kallsyms == 1)
1023                 return true;
1024
1025         return false;
1026 }
1027
1028 const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
1029                                  unsigned long *off, char *sym);
1030 bool is_bpf_text_address(unsigned long addr);
1031 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
1032                     char *sym);
1033
1034 static inline const char *
1035 bpf_address_lookup(unsigned long addr, unsigned long *size,
1036                    unsigned long *off, char **modname, char *sym)
1037 {
1038         const char *ret = __bpf_address_lookup(addr, size, off, sym);
1039
1040         if (ret && modname)
1041                 *modname = NULL;
1042         return ret;
1043 }
1044
1045 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1046 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1047 void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
1048
1049 #else /* CONFIG_BPF_JIT */
1050
1051 static inline bool ebpf_jit_enabled(void)
1052 {
1053         return false;
1054 }
1055
1056 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1057 {
1058         return false;
1059 }
1060
1061 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1062 {
1063         return false;
1064 }
1065
1066 static inline int
1067 bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1068                             struct bpf_jit_poke_descriptor *poke)
1069 {
1070         return -ENOTSUPP;
1071 }
1072
1073 static inline void bpf_jit_free(struct bpf_prog *fp)
1074 {
1075         bpf_prog_unlock_free(fp);
1076 }
1077
1078 static inline bool bpf_jit_kallsyms_enabled(void)
1079 {
1080         return false;
1081 }
1082
1083 static inline const char *
1084 __bpf_address_lookup(unsigned long addr, unsigned long *size,
1085                      unsigned long *off, char *sym)
1086 {
1087         return NULL;
1088 }
1089
1090 static inline bool is_bpf_text_address(unsigned long addr)
1091 {
1092         return false;
1093 }
1094
1095 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1096                                   char *type, char *sym)
1097 {
1098         return -ERANGE;
1099 }
1100
1101 static inline const char *
1102 bpf_address_lookup(unsigned long addr, unsigned long *size,
1103                    unsigned long *off, char **modname, char *sym)
1104 {
1105         return NULL;
1106 }
1107
1108 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1109 {
1110 }
1111
1112 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1113 {
1114 }
1115
1116 static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
1117 {
1118         sym[0] = '\0';
1119 }
1120
1121 #endif /* CONFIG_BPF_JIT */
1122
1123 void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1124
1125 #define BPF_ANC         BIT(15)
1126
1127 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1128 {
1129         switch (first->code) {
1130         case BPF_RET | BPF_K:
1131         case BPF_LD | BPF_W | BPF_LEN:
1132                 return false;
1133
1134         case BPF_LD | BPF_W | BPF_ABS:
1135         case BPF_LD | BPF_H | BPF_ABS:
1136         case BPF_LD | BPF_B | BPF_ABS:
1137                 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1138                         return true;
1139                 return false;
1140
1141         default:
1142                 return true;
1143         }
1144 }
1145
1146 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1147 {
1148         BUG_ON(ftest->code & BPF_ANC);
1149
1150         switch (ftest->code) {
1151         case BPF_LD | BPF_W | BPF_ABS:
1152         case BPF_LD | BPF_H | BPF_ABS:
1153         case BPF_LD | BPF_B | BPF_ABS:
1154 #define BPF_ANCILLARY(CODE)     case SKF_AD_OFF + SKF_AD_##CODE:        \
1155                                 return BPF_ANC | SKF_AD_##CODE
1156                 switch (ftest->k) {
1157                 BPF_ANCILLARY(PROTOCOL);
1158                 BPF_ANCILLARY(PKTTYPE);
1159                 BPF_ANCILLARY(IFINDEX);
1160                 BPF_ANCILLARY(NLATTR);
1161                 BPF_ANCILLARY(NLATTR_NEST);
1162                 BPF_ANCILLARY(MARK);
1163                 BPF_ANCILLARY(QUEUE);
1164                 BPF_ANCILLARY(HATYPE);
1165                 BPF_ANCILLARY(RXHASH);
1166                 BPF_ANCILLARY(CPU);
1167                 BPF_ANCILLARY(ALU_XOR_X);
1168                 BPF_ANCILLARY(VLAN_TAG);
1169                 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1170                 BPF_ANCILLARY(PAY_OFFSET);
1171                 BPF_ANCILLARY(RANDOM);
1172                 BPF_ANCILLARY(VLAN_TPID);
1173                 }
1174                 /* Fallthrough. */
1175         default:
1176                 return ftest->code;
1177         }
1178 }
1179
1180 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1181                                            int k, unsigned int size);
1182
1183 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
1184                                      unsigned int size, void *buffer)
1185 {
1186         if (k >= 0)
1187                 return skb_header_pointer(skb, k, size, buffer);
1188
1189         return bpf_internal_load_pointer_neg_helper(skb, k, size);
1190 }
1191
1192 static inline int bpf_tell_extensions(void)
1193 {
1194         return SKF_AD_MAX;
1195 }
1196
1197 struct bpf_sock_addr_kern {
1198         struct sock *sk;
1199         struct sockaddr *uaddr;
1200         /* Temporary "register" to make indirect stores to nested structures
1201          * defined above. We need three registers to make such a store, but
1202          * only two (src and dst) are available at convert_ctx_access time
1203          */
1204         u64 tmp_reg;
1205         void *t_ctx;    /* Attach type specific context. */
1206 };
1207
1208 struct bpf_sock_ops_kern {
1209         struct  sock *sk;
1210         u32     op;
1211         union {
1212                 u32 args[4];
1213                 u32 reply;
1214                 u32 replylong[4];
1215         };
1216         u32     is_fullsock;
1217         u64     temp;                   /* temp and everything after is not
1218                                          * initialized to 0 before calling
1219                                          * the BPF program. New fields that
1220                                          * should be initialized to 0 should
1221                                          * be inserted before temp.
1222                                          * temp is scratch storage used by
1223                                          * sock_ops_convert_ctx_access
1224                                          * as temporary storage of a register.
1225                                          */
1226 };
1227
1228 struct bpf_sysctl_kern {
1229         struct ctl_table_header *head;
1230         struct ctl_table *table;
1231         void *cur_val;
1232         size_t cur_len;
1233         void *new_val;
1234         size_t new_len;
1235         int new_updated;
1236         int write;
1237         loff_t *ppos;
1238         /* Temporary "register" for indirect stores to ppos. */
1239         u64 tmp_reg;
1240 };
1241
1242 struct bpf_sockopt_kern {
1243         struct sock     *sk;
1244         u8              *optval;
1245         u8              *optval_end;
1246         s32             level;
1247         s32             optname;
1248         s32             optlen;
1249         s32             retval;
1250 };
1251
1252 #endif /* __LINUX_FILTER_H__ */