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