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