include/linux/filter.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Linux Socket Filter Data Structures
   4  */
   5 #ifndef __LINUX_FILTER_H__
   6 #define __LINUX_FILTER_H__
   7
   8 #include <stdarg.h>
   9
  10 #include <linux/atomic.h>
  11 #include <linux/refcount.h>
  12 #include <linux/compat.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/linkage.h>
  15 #include <linux/printk.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/sched.h>
  18 #include <linux/capability.h>
  19 #include <linux/cryptohash.h>
  20 #include <linux/set_memory.h>
  21 #include <linux/kallsyms.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/vmalloc.h>
  24
  25 #include <net/sch_generic.h>
  26
  27 #include <uapi/linux/filter.h>
  28 #include <uapi/linux/bpf.h>
  29
  30 struct sk_buff;
  31 struct sock;
  32 struct seccomp_data;
  33 struct bpf_prog_aux;
  34 struct xdp_rxq_info;
  35 struct xdp_buff;
  36 struct sock_reuseport;
  37 struct ctl_table;
  38 struct ctl_table_header;
  39
  40 /* ArgX, context and stack frame pointer register positions. Note,
  41  * Arg1, Arg2, Arg3, etc are used as argument mappings of function
  42  * calls in BPF_CALL instruction.
  43  */
  44 #define BPF_REG_ARG1    BPF_REG_1
  45 #define BPF_REG_ARG2    BPF_REG_2
  46 #define BPF_REG_ARG3    BPF_REG_3
  47 #define BPF_REG_ARG4    BPF_REG_4
  48 #define BPF_REG_ARG5    BPF_REG_5
  49 #define BPF_REG_CTX     BPF_REG_6
  50 #define BPF_REG_FP      BPF_REG_10
  51
  52 /* Additional register mappings for converted user programs. */
  53 #define BPF_REG_A       BPF_REG_0
  54 #define BPF_REG_X       BPF_REG_7
  55 #define BPF_REG_TMP     BPF_REG_2       /* scratch reg */
  56 #define BPF_REG_D       BPF_REG_8       /* data, callee-saved */
  57 #define BPF_REG_H       BPF_REG_9       /* hlen, callee-saved */
  58
  59 /* Kernel hidden auxiliary/helper register. */
  60 #define BPF_REG_AX              MAX_BPF_REG
  61 #define MAX_BPF_EXT_REG         (MAX_BPF_REG + 1)
  62 #define MAX_BPF_JIT_REG         MAX_BPF_EXT_REG
  63
  64 /* unused opcode to mark special call to bpf_tail_call() helper */
  65 #define BPF_TAIL_CALL   0xf0
  66
  67 /* unused opcode to mark call to interpreter with arguments */
  68 #define BPF_CALL_ARGS   0xe0
  69
  70 /* As per nm, we expose JITed images as text (code) section for
  71  * kallsyms. That way, tools like perf can find it to match
  72  * addresses.
  73  */
  74 #define BPF_SYM_ELF_TYPE        't'
  75
  76 /* BPF program can access up to 512 bytes of stack space. */
  77 #define MAX_BPF_STACK   512
  78
  79 /* Helper macros for filter block array initializers. */
  80
  81 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
  82
  83 #define BPF_ALU64_REG(OP, DST, SRC)                             \
  84         ((struct bpf_insn) {                                    \
  85                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
  86                 .dst_reg = DST,                                 \
  87                 .src_reg = SRC,                                 \
  88                 .off   = 0,                                     \
  89                 .imm   = 0 })
  90
  91 #define BPF_ALU32_REG(OP, DST, SRC)                             \
  92         ((struct bpf_insn) {                                    \
  93                 .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
  94                 .dst_reg = DST,                                 \
  95                 .src_reg = SRC,                                 \
  96                 .off   = 0,                                     \
  97                 .imm   = 0 })
  98
  99 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 100
 101 #define BPF_ALU64_IMM(OP, DST, IMM)                             \
 102         ((struct bpf_insn) {                                    \
 103                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
 104                 .dst_reg = DST,                                 \
 105                 .src_reg = 0,                                   \
 106                 .off   = 0,                                     \
 107                 .imm   = IMM })
 108
 109 #define BPF_ALU32_IMM(OP, DST, IMM)                             \
 110         ((struct bpf_insn) {                                    \
 111                 .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
 112                 .dst_reg = DST,                                 \
 113                 .src_reg = 0,                                   \
 114                 .off   = 0,                                     \
 115                 .imm   = IMM })
 116
 117 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
 118
 119 #define BPF_ENDIAN(TYPE, DST, LEN)                              \
 120         ((struct bpf_insn) {                                    \
 121                 .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
 122                 .dst_reg = DST,                                 \
 123                 .src_reg = 0,                                   \
 124                 .off   = 0,                                     \
 125                 .imm   = LEN })
 126
 127 /* Short form of mov, dst_reg = src_reg */
 128
 129 #define BPF_MOV64_REG(DST, SRC)                                 \
 130         ((struct bpf_insn) {                                    \
 131                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 132                 .dst_reg = DST,                                 \
 133                 .src_reg = SRC,                                 \
 134                 .off   = 0,                                     \
 135                 .imm   = 0 })
 136
 137 #define BPF_MOV32_REG(DST, SRC)                                 \
 138         ((struct bpf_insn) {                                    \
 139                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 140                 .dst_reg = DST,                                 \
 141                 .src_reg = SRC,                                 \
 142                 .off   = 0,                                     \
 143                 .imm   = 0 })
 144
 145 /* Short form of mov, dst_reg = imm32 */
 146
 147 #define BPF_MOV64_IMM(DST, IMM)                                 \
 148         ((struct bpf_insn) {                                    \
 149                 .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
 150                 .dst_reg = DST,                                 \
 151                 .src_reg = 0,                                   \
 152                 .off   = 0,                                     \
 153                 .imm   = IMM })
 154
 155 #define BPF_MOV32_IMM(DST, IMM)                                 \
 156         ((struct bpf_insn) {                                    \
 157                 .code  = BPF_ALU | BPF_MOV | BPF_K,             \
 158                 .dst_reg = DST,                                 \
 159                 .src_reg = 0,                                   \
 160                 .off   = 0,                                     \
 161                 .imm   = IMM })
 162
 163 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
 164 #define BPF_LD_IMM64(DST, IMM)                                  \
 165         BPF_LD_IMM64_RAW(DST, 0, IMM)
 166
 167 #define BPF_LD_IMM64_RAW(DST, SRC, IMM)                         \
 168         ((struct bpf_insn) {                                    \
 169                 .code  = BPF_LD | BPF_DW | BPF_IMM,             \
 170                 .dst_reg = DST,                                 \
 171                 .src_reg = SRC,                                 \
 172                 .off   = 0,                                     \
 173                 .imm   = (__u32) (IMM) }),                      \
 174         ((struct bpf_insn) {                                    \
 175                 .code  = 0, /* zero is reserved opcode */       \
 176                 .dst_reg = 0,                                   \
 177                 .src_reg = 0,                                   \
 178                 .off   = 0,                                     \
 179                 .imm   = ((__u64) (IMM)) >> 32 })
 180
 181 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
 182 #define BPF_LD_MAP_FD(DST, MAP_FD)                              \
 183         BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
 184
 185 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
 186
 187 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)                      \
 188         ((struct bpf_insn) {                                    \
 189                 .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
 190                 .dst_reg = DST,                                 \
 191                 .src_reg = SRC,                                 \
 192                 .off   = 0,                                     \
 193                 .imm   = IMM })
 194
 195 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)                      \
 196         ((struct bpf_insn) {                                    \
 197                 .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
 198                 .dst_reg = DST,                                 \
 199                 .src_reg = SRC,                                 \
 200                 .off   = 0,                                     \
 201                 .imm   = IMM })
 202
 203 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
 204
 205 #define BPF_LD_ABS(SIZE, IMM)                                   \
 206         ((struct bpf_insn) {                                    \
 207                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
 208                 .dst_reg = 0,                                   \
 209                 .src_reg = 0,                                   \
 210                 .off   = 0,                                     \
 211                 .imm   = IMM })
 212
 213 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
 214
 215 #define BPF_LD_IND(SIZE, SRC, IMM)                              \
 216         ((struct bpf_insn) {                                    \
 217                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
 218                 .dst_reg = 0,                                   \
 219                 .src_reg = SRC,                                 \
 220                 .off   = 0,                                     \
 221                 .imm   = IMM })
 222
 223 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
 224
 225 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)                        \
 226         ((struct bpf_insn) {                                    \
 227                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
 228                 .dst_reg = DST,                                 \
 229                 .src_reg = SRC,                                 \
 230                 .off   = OFF,                                   \
 231                 .imm   = 0 })
 232
 233 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
 234
 235 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)                        \
 236         ((struct bpf_insn) {                                    \
 237                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
 238                 .dst_reg = DST,                                 \
 239                 .src_reg = SRC,                                 \
 240                 .off   = OFF,                                   \
 241                 .imm   = 0 })
 242
 243 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
 244
 245 #define BPF_STX_XADD(SIZE, DST, SRC, OFF)                       \
 246         ((struct bpf_insn) {                                    \
 247                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,   \
 248                 .dst_reg = DST,                                 \
 249                 .src_reg = SRC,                                 \
 250                 .off   = OFF,                                   \
 251                 .imm   = 0 })
 252
 253 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
 254
 255 #define BPF_ST_MEM(SIZE, DST, OFF, IMM)                         \
 256         ((struct bpf_insn) {                                    \
 257                 .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
 258                 .dst_reg = DST,                                 \
 259                 .src_reg = 0,                                   \
 260                 .off   = OFF,                                   \
 261                 .imm   = IMM })
 262
 263 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
 264
 265 #define BPF_JMP_REG(OP, DST, SRC, OFF)                          \
 266         ((struct bpf_insn) {                                    \
 267                 .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
 268                 .dst_reg = DST,                                 \
 269                 .src_reg = SRC,                                 \
 270                 .off   = OFF,                                   \
 271                 .imm   = 0 })
 272
 273 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
 274
 275 #define BPF_JMP_IMM(OP, DST, IMM, OFF)                          \
 276         ((struct bpf_insn) {                                    \
 277                 .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
 278                 .dst_reg = DST,                                 \
 279                 .src_reg = 0,                                   \
 280                 .off   = OFF,                                   \
 281                 .imm   = IMM })
 282
 283 /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
 284
 285 #define BPF_JMP32_REG(OP, DST, SRC, OFF)                        \
 286         ((struct bpf_insn) {                                    \
 287                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_X,        \
 288                 .dst_reg = DST,                                 \
 289                 .src_reg = SRC,                                 \
 290                 .off   = OFF,                                   \
 291                 .imm   = 0 })
 292
 293 /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
 294
 295 #define BPF_JMP32_IMM(OP, DST, IMM, OFF)                        \
 296         ((struct bpf_insn) {                                    \
 297                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_K,        \
 298                 .dst_reg = DST,                                 \
 299                 .src_reg = 0,                                   \
 300                 .off   = OFF,                                   \
 301                 .imm   = IMM })
 302
 303 /* Unconditional jumps, goto pc + off16 */
 304
 305 #define BPF_JMP_A(OFF)                                          \
 306         ((struct bpf_insn) {                                    \
 307                 .code  = BPF_JMP | BPF_JA,                      \
 308                 .dst_reg = 0,                                   \
 309                 .src_reg = 0,                                   \
 310                 .off   = OFF,                                   \
 311                 .imm   = 0 })
 312
 313 /* Relative call */
 314
 315 #define BPF_CALL_REL(TGT)                                       \
 316         ((struct bpf_insn) {                                    \
 317                 .code  = BPF_JMP | BPF_CALL,                    \
 318                 .dst_reg = 0,                                   \
 319                 .src_reg = BPF_PSEUDO_CALL,                     \
 320                 .off   = 0,                                     \
 321                 .imm   = TGT })
 322
 323 /* Function call */
 324
 325 #define BPF_CAST_CALL(x)                                        \
 326                 ((u64 (*)(u64, u64, u64, u64, u64))(x))
 327
 328 #define BPF_EMIT_CALL(FUNC)                                     \
 329         ((struct bpf_insn) {                                    \
 330                 .code  = BPF_JMP | BPF_CALL,                    \
 331                 .dst_reg = 0,                                   \
 332                 .src_reg = 0,                                   \
 333                 .off   = 0,                                     \
 334                 .imm   = ((FUNC) - __bpf_call_base) })
 335
 336 /* Raw code statement block */
 337
 338 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)                  \
 339         ((struct bpf_insn) {                                    \
 340                 .code  = CODE,                                  \
 341                 .dst_reg = DST,                                 \
 342                 .src_reg = SRC,                                 \
 343                 .off   = OFF,                                   \
 344                 .imm   = IMM })
 345
 346 /* Program exit */
 347
 348 #define BPF_EXIT_INSN()                                         \
 349         ((struct bpf_insn) {                                    \
 350                 .code  = BPF_JMP | BPF_EXIT,                    \
 351                 .dst_reg = 0,                                   \
 352                 .src_reg = 0,                                   \
 353                 .off   = 0,                                     \
 354                 .imm   = 0 })
 355
 356 /* Internal classic blocks for direct assignment */
 357
 358 #define __BPF_STMT(CODE, K)                                     \
 359         ((struct sock_filter) BPF_STMT(CODE, K))
 360
 361 #define __BPF_JUMP(CODE, K, JT, JF)                             \
 362         ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
 363
 364 #define bytes_to_bpf_size(bytes)                                \
 365 ({                                                              \
 366         int bpf_size = -EINVAL;                                 \
 367                                                                 \
 368         if (bytes == sizeof(u8))                                \
 369                 bpf_size = BPF_B;                               \
 370         else if (bytes == sizeof(u16))                          \
 371                 bpf_size = BPF_H;                               \
 372         else if (bytes == sizeof(u32))                          \
 373                 bpf_size = BPF_W;                               \
 374         else if (bytes == sizeof(u64))                          \
 375                 bpf_size = BPF_DW;                              \
 376                                                                 \
 377         bpf_size;                                               \
 378 })
 379
 380 #define bpf_size_to_bytes(bpf_size)                             \
 381 ({                                                              \
 382         int bytes = -EINVAL;                                    \
 383                                                                 \
 384         if (bpf_size == BPF_B)                                  \
 385                 bytes = sizeof(u8);                             \
 386         else if (bpf_size == BPF_H)                             \
 387                 bytes = sizeof(u16);                            \
 388         else if (bpf_size == BPF_W)                             \
 389                 bytes = sizeof(u32);                            \
 390         else if (bpf_size == BPF_DW)                            \
 391                 bytes = sizeof(u64);                            \
 392                                                                 \
 393         bytes;                                                  \
 394 })
 395
 396 #define BPF_SIZEOF(type)                                        \
 397         ({                                                      \
 398                 const int __size = bytes_to_bpf_size(sizeof(type)); \
 399                 BUILD_BUG_ON(__size < 0);                       \
 400                 __size;                                         \
 401         })
 402
 403 #define BPF_FIELD_SIZEOF(type, field)                           \
 404         ({                                                      \
 405                 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
 406                 BUILD_BUG_ON(__size < 0);                       \
 407                 __size;                                         \
 408         })
 409
 410 #define BPF_LDST_BYTES(insn)                                    \
 411         ({                                                      \
 412                 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
 413                 WARN_ON(__size < 0);                            \
 414                 __size;                                         \
 415         })
 416
 417 #define __BPF_MAP_0(m, v, ...) v
 418 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
 419 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
 420 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
 421 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
 422 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
 423
 424 #define __BPF_REG_0(...) __BPF_PAD(5)
 425 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
 426 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
 427 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
 428 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
 429 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
 430
 431 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
 432 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
 433
 434 #define __BPF_CAST(t, a)                                                       \
 435         (__force t)                                                            \
 436         (__force                                                               \
 437          typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
 438                                       (unsigned long)0, (t)0))) a
 439 #define __BPF_V void
 440 #define __BPF_N
 441
 442 #define __BPF_DECL_ARGS(t, a) t   a
 443 #define __BPF_DECL_REGS(t, a) u64 a
 444
 445 #define __BPF_PAD(n)                                                           \
 446         __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
 447                   u64, __ur_3, u64, __ur_4, u64, __ur_5)
 448
 449 #define BPF_CALL_x(x, name, ...)                                               \
 450         static __always_inline                                                 \
 451         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
 452         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));         \
 453         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))          \
 454         {                                                                      \
 455                 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
 456         }                                                                      \
 457         static __always_inline                                                 \
 458         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
 459
 460 #define BPF_CALL_0(name, ...)   BPF_CALL_x(0, name, __VA_ARGS__)
 461 #define BPF_CALL_1(name, ...)   BPF_CALL_x(1, name, __VA_ARGS__)
 462 #define BPF_CALL_2(name, ...)   BPF_CALL_x(2, name, __VA_ARGS__)
 463 #define BPF_CALL_3(name, ...)   BPF_CALL_x(3, name, __VA_ARGS__)
 464 #define BPF_CALL_4(name, ...)   BPF_CALL_x(4, name, __VA_ARGS__)
 465 #define BPF_CALL_5(name, ...)   BPF_CALL_x(5, name, __VA_ARGS__)
 466
 467 #define bpf_ctx_range(TYPE, MEMBER)                                             \
 468         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 469 #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2)                              \
 470         offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
 471 #if BITS_PER_LONG == 64
 472 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 473         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 474 #else
 475 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 476         offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
 477 #endif /* BITS_PER_LONG == 64 */
 478
 479 #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE)                            \
 480         ({                                                                      \
 481                 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE));             \
 482                 *(PTR_SIZE) = (SIZE);                                           \
 483                 offsetof(TYPE, MEMBER);                                         \
 484         })
 485
 486 #ifdef CONFIG_COMPAT
 487 /* A struct sock_filter is architecture independent. */
 488 struct compat_sock_fprog {
 489         u16             len;
 490         compat_uptr_t   filter; /* struct sock_filter * */
 491 };
 492 #endif
 493
 494 struct sock_fprog_kern {
 495         u16                     len;
 496         struct sock_filter      *filter;
 497 };
 498
 499 struct bpf_binary_header {
 500         u32 pages;
 501         /* Some arches need word alignment for their instructions */
 502         u8 image[] __aligned(4);
 503 };
 504
 505 struct bpf_prog {
 506         u16                     pages;          /* Number of allocated pages */
 507         u16                     jited:1,        /* Is our filter JIT'ed? */
 508                                 jit_requested:1,/* archs need to JIT the prog */
 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         set_vm_flush_reset_perms(fp);
 739         set_memory_ro((unsigned long)fp, fp->pages);
 740 }
 741
 742 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
 743 {
 744         set_vm_flush_reset_perms(hdr);
 745         set_memory_ro((unsigned long)hdr, hdr->pages);
 746         set_memory_x((unsigned long)hdr, hdr->pages);
 747 }
 748
 749 static inline struct bpf_binary_header *
 750 bpf_jit_binary_hdr(const struct bpf_prog *fp)
 751 {
 752         unsigned long real_start = (unsigned long)fp->bpf_func;
 753         unsigned long addr = real_start & PAGE_MASK;
 754
 755         return (void *)addr;
 756 }
 757
 758 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
 759 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
 760 {
 761         return sk_filter_trim_cap(sk, skb, 1);
 762 }
 763
 764 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
 765 void bpf_prog_free(struct bpf_prog *fp);
 766
 767 bool bpf_opcode_in_insntable(u8 code);
 768
 769 void bpf_prog_free_linfo(struct bpf_prog *prog);
 770 void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
 771                                const u32 *insn_to_jit_off);
 772 int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
 773 void bpf_prog_free_jited_linfo(struct bpf_prog *prog);
 774 void bpf_prog_free_unused_jited_linfo(struct bpf_prog *prog);
 775
 776 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
 777 struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
 778 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
 779                                   gfp_t gfp_extra_flags);
 780 void __bpf_prog_free(struct bpf_prog *fp);
 781
 782 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
 783 {
 784         __bpf_prog_free(fp);
 785 }
 786
 787 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
 788                                        unsigned int flen);
 789
 790 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
 791 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
 792                               bpf_aux_classic_check_t trans, bool save_orig);
 793 void bpf_prog_destroy(struct bpf_prog *fp);
 794
 795 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 796 int sk_attach_bpf(u32 ufd, struct sock *sk);
 797 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 798 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
 799 void sk_reuseport_prog_free(struct bpf_prog *prog);
 800 int sk_detach_filter(struct sock *sk);
 801 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
 802                   unsigned int len);
 803
 804 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
 805 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
 806
 807 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 808 #define __bpf_call_base_args \
 809         ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
 810          __bpf_call_base)
 811
 812 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
 813 void bpf_jit_compile(struct bpf_prog *prog);
 814 bool bpf_helper_changes_pkt_data(void *func);
 815
 816 static inline bool bpf_dump_raw_ok(void)
 817 {
 818         /* Reconstruction of call-sites is dependent on kallsyms,
 819          * thus make dump the same restriction.
 820          */
 821         return kallsyms_show_value() == 1;
 822 }
 823
 824 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
 825                                        const struct bpf_insn *patch, u32 len);
 826 int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
 827
 828 void bpf_clear_redirect_map(struct bpf_map *map);
 829
 830 static inline bool xdp_return_frame_no_direct(void)
 831 {
 832         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 833
 834         return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
 835 }
 836
 837 static inline void xdp_set_return_frame_no_direct(void)
 838 {
 839         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 840
 841         ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
 842 }
 843
 844 static inline void xdp_clear_return_frame_no_direct(void)
 845 {
 846         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 847
 848         ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
 849 }
 850
 851 static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
 852                                  unsigned int pktlen)
 853 {
 854         unsigned int len;
 855
 856         if (unlikely(!(fwd->flags & IFF_UP)))
 857                 return -ENETDOWN;
 858
 859         len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
 860         if (pktlen > len)
 861                 return -EMSGSIZE;
 862
 863         return 0;
 864 }
 865
 866 /* The pair of xdp_do_redirect and xdp_do_flush_map MUST be called in the
 867  * same cpu context. Further for best results no more than a single map
 868  * for the do_redirect/do_flush pair should be used. This limitation is
 869  * because we only track one map and force a flush when the map changes.
 870  * This does not appear to be a real limitation for existing software.
 871  */
 872 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
 873                             struct xdp_buff *xdp, struct bpf_prog *prog);
 874 int xdp_do_redirect(struct net_device *dev,
 875                     struct xdp_buff *xdp,
 876                     struct bpf_prog *prog);
 877 void xdp_do_flush_map(void);
 878
 879 void bpf_warn_invalid_xdp_action(u32 act);
 880
 881 #ifdef CONFIG_INET
 882 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 883                                   struct bpf_prog *prog, struct sk_buff *skb,
 884                                   u32 hash);
 885 #else
 886 static inline struct sock *
 887 bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 888                      struct bpf_prog *prog, struct sk_buff *skb,
 889                      u32 hash)
 890 {
 891         return NULL;
 892 }
 893 #endif
 894
 895 #ifdef CONFIG_BPF_JIT
 896 extern int bpf_jit_enable;
 897 extern int bpf_jit_harden;
 898 extern int bpf_jit_kallsyms;
 899 extern long bpf_jit_limit;
 900
 901 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
 902
 903 struct bpf_binary_header *
 904 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
 905                      unsigned int alignment,
 906                      bpf_jit_fill_hole_t bpf_fill_ill_insns);
 907 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
 908 u64 bpf_jit_alloc_exec_limit(void);
 909 void *bpf_jit_alloc_exec(unsigned long size);
 910 void bpf_jit_free_exec(void *addr);
 911 void bpf_jit_free(struct bpf_prog *fp);
 912
 913 int bpf_jit_get_func_addr(const struct bpf_prog *prog,
 914                           const struct bpf_insn *insn, bool extra_pass,
 915                           u64 *func_addr, bool *func_addr_fixed);
 916
 917 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
 918 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
 919
 920 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
 921                                 u32 pass, void *image)
 922 {
 923         pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
 924                proglen, pass, image, current->comm, task_pid_nr(current));
 925
 926         if (image)
 927                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
 928                                16, 1, image, proglen, false);
 929 }
 930
 931 static inline bool bpf_jit_is_ebpf(void)
 932 {
 933 # ifdef CONFIG_HAVE_EBPF_JIT
 934         return true;
 935 # else
 936         return false;
 937 # endif
 938 }
 939
 940 static inline bool ebpf_jit_enabled(void)
 941 {
 942         return bpf_jit_enable && bpf_jit_is_ebpf();
 943 }
 944
 945 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
 946 {
 947         return fp->jited && bpf_jit_is_ebpf();
 948 }
 949
 950 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
 951 {
 952         /* These are the prerequisites, should someone ever have the
 953          * idea to call blinding outside of them, we make sure to
 954          * bail out.
 955          */
 956         if (!bpf_jit_is_ebpf())
 957                 return false;
 958         if (!prog->jit_requested)
 959                 return false;
 960         if (!bpf_jit_harden)
 961                 return false;
 962         if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
 963                 return false;
 964
 965         return true;
 966 }
 967
 968 static inline bool bpf_jit_kallsyms_enabled(void)
 969 {
 970         /* There are a couple of corner cases where kallsyms should
 971          * not be enabled f.e. on hardening.
 972          */
 973         if (bpf_jit_harden)
 974                 return false;
 975         if (!bpf_jit_kallsyms)
 976                 return false;
 977         if (bpf_jit_kallsyms == 1)
 978                 return true;
 979
 980         return false;
 981 }
 982
 983 const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
 984                                  unsigned long *off, char *sym);
 985 bool is_bpf_text_address(unsigned long addr);
 986 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
 987                     char *sym);
 988
 989 static inline const char *
 990 bpf_address_lookup(unsigned long addr, unsigned long *size,
 991                    unsigned long *off, char **modname, char *sym)
 992 {
 993         const char *ret = __bpf_address_lookup(addr, size, off, sym);
 994
 995         if (ret && modname)
 996                 *modname = NULL;
 997         return ret;
 998 }
 999
1000 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1001 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1002 void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
1003
1004 #else /* CONFIG_BPF_JIT */
1005
1006 static inline bool ebpf_jit_enabled(void)
1007 {
1008         return false;
1009 }
1010
1011 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1012 {
1013         return false;
1014 }
1015
1016 static inline void bpf_jit_free(struct bpf_prog *fp)
1017 {
1018         bpf_prog_unlock_free(fp);
1019 }
1020
1021 static inline bool bpf_jit_kallsyms_enabled(void)
1022 {
1023         return false;
1024 }
1025
1026 static inline const char *
1027 __bpf_address_lookup(unsigned long addr, unsigned long *size,
1028                      unsigned long *off, char *sym)
1029 {
1030         return NULL;
1031 }
1032
1033 static inline bool is_bpf_text_address(unsigned long addr)
1034 {
1035         return false;
1036 }
1037
1038 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1039                                   char *type, char *sym)
1040 {
1041         return -ERANGE;
1042 }
1043
1044 static inline const char *
1045 bpf_address_lookup(unsigned long addr, unsigned long *size,
1046                    unsigned long *off, char **modname, char *sym)
1047 {
1048         return NULL;
1049 }
1050
1051 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1052 {
1053 }
1054
1055 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1056 {
1057 }
1058
1059 static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
1060 {
1061         sym[0] = '\0';
1062 }
1063
1064 #endif /* CONFIG_BPF_JIT */
1065
1066 void bpf_prog_kallsyms_del_subprogs(struct bpf_prog *fp);
1067 void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1068
1069 #define BPF_ANC         BIT(15)
1070
1071 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1072 {
1073         switch (first->code) {
1074         case BPF_RET | BPF_K:
1075         case BPF_LD | BPF_W | BPF_LEN:
1076                 return false;
1077
1078         case BPF_LD | BPF_W | BPF_ABS:
1079         case BPF_LD | BPF_H | BPF_ABS:
1080         case BPF_LD | BPF_B | BPF_ABS:
1081                 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1082                         return true;
1083                 return false;
1084
1085         default:
1086                 return true;
1087         }
1088 }
1089
1090 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1091 {
1092         BUG_ON(ftest->code & BPF_ANC);
1093
1094         switch (ftest->code) {
1095         case BPF_LD | BPF_W | BPF_ABS:
1096         case BPF_LD | BPF_H | BPF_ABS:
1097         case BPF_LD | BPF_B | BPF_ABS:
1098 #define BPF_ANCILLARY(CODE)     case SKF_AD_OFF + SKF_AD_##CODE:        \
1099                                 return BPF_ANC | SKF_AD_##CODE
1100                 switch (ftest->k) {
1101                 BPF_ANCILLARY(PROTOCOL);
1102                 BPF_ANCILLARY(PKTTYPE);
1103                 BPF_ANCILLARY(IFINDEX);
1104                 BPF_ANCILLARY(NLATTR);
1105                 BPF_ANCILLARY(NLATTR_NEST);
1106                 BPF_ANCILLARY(MARK);
1107                 BPF_ANCILLARY(QUEUE);
1108                 BPF_ANCILLARY(HATYPE);
1109                 BPF_ANCILLARY(RXHASH);
1110                 BPF_ANCILLARY(CPU);
1111                 BPF_ANCILLARY(ALU_XOR_X);
1112                 BPF_ANCILLARY(VLAN_TAG);
1113                 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1114                 BPF_ANCILLARY(PAY_OFFSET);
1115                 BPF_ANCILLARY(RANDOM);
1116                 BPF_ANCILLARY(VLAN_TPID);
1117                 }
1118                 /* Fallthrough. */
1119         default:
1120                 return ftest->code;
1121         }
1122 }
1123
1124 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1125                                            int k, unsigned int size);
1126
1127 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
1128                                      unsigned int size, void *buffer)
1129 {
1130         if (k >= 0)
1131                 return skb_header_pointer(skb, k, size, buffer);
1132
1133         return bpf_internal_load_pointer_neg_helper(skb, k, size);
1134 }
1135
1136 static inline int bpf_tell_extensions(void)
1137 {
1138         return SKF_AD_MAX;
1139 }
1140
1141 struct bpf_sock_addr_kern {
1142         struct sock *sk;
1143         struct sockaddr *uaddr;
1144         /* Temporary "register" to make indirect stores to nested structures
1145          * defined above. We need three registers to make such a store, but
1146          * only two (src and dst) are available at convert_ctx_access time
1147          */
1148         u64 tmp_reg;
1149         void *t_ctx;    /* Attach type specific context. */
1150 };
1151
1152 struct bpf_sock_ops_kern {
1153         struct  sock *sk;
1154         u32     op;
1155         union {
1156                 u32 args[4];
1157                 u32 reply;
1158                 u32 replylong[4];
1159         };
1160         u32     is_fullsock;
1161         u64     temp;                   /* temp and everything after is not
1162                                          * initialized to 0 before calling
1163                                          * the BPF program. New fields that
1164                                          * should be initialized to 0 should
1165                                          * be inserted before temp.
1166                                          * temp is scratch storage used by
1167                                          * sock_ops_convert_ctx_access
1168                                          * as temporary storage of a register.
1169                                          */
1170 };
1171
1172 struct bpf_sysctl_kern {
1173         struct ctl_table_header *head;
1174         struct ctl_table *table;
1175         void *cur_val;
1176         size_t cur_len;
1177         void *new_val;
1178         size_t new_len;
1179         int new_updated;
1180         int write;
1181         loff_t *ppos;
1182         /* Temporary "register" for indirect stores to ppos. */
1183         u64 tmp_reg;
1184 };
1185
1186 #endif /* __LINUX_FILTER_H__ */