include/linux/filter.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Linux Socket Filter Data Structures
   4  */
   5 #ifndef __LINUX_FILTER_H__
   6 #define __LINUX_FILTER_H__
   7
   8 #include <stdarg.h>
   9
  10 #include <linux/atomic.h>
  11 #include <linux/refcount.h>
  12 #include <linux/compat.h>
  13 #include <linux/skbuff.h>
  14 #include <linux/linkage.h>
  15 #include <linux/printk.h>
  16 #include <linux/workqueue.h>
  17 #include <linux/sched.h>
  18 #include <linux/capability.h>
  19 #include <linux/cryptohash.h>
  20 #include <linux/set_memory.h>
  21 #include <linux/kallsyms.h>
  22 #include <linux/if_vlan.h>
  23 #include <linux/vmalloc.h>
  24
  25 #include <net/sch_generic.h>
  26
  27 #include <asm/byteorder.h>
  28 #include <uapi/linux/filter.h>
  29 #include <uapi/linux/bpf.h>
  30
  31 struct sk_buff;
  32 struct sock;
  33 struct seccomp_data;
  34 struct bpf_prog_aux;
  35 struct xdp_rxq_info;
  36 struct xdp_buff;
  37 struct sock_reuseport;
  38 struct ctl_table;
  39 struct ctl_table_header;
  40
  41 /* ArgX, context and stack frame pointer register positions. Note,
  42  * Arg1, Arg2, Arg3, etc are used as argument mappings of function
  43  * calls in BPF_CALL instruction.
  44  */
  45 #define BPF_REG_ARG1    BPF_REG_1
  46 #define BPF_REG_ARG2    BPF_REG_2
  47 #define BPF_REG_ARG3    BPF_REG_3
  48 #define BPF_REG_ARG4    BPF_REG_4
  49 #define BPF_REG_ARG5    BPF_REG_5
  50 #define BPF_REG_CTX     BPF_REG_6
  51 #define BPF_REG_FP      BPF_REG_10
  52
  53 /* Additional register mappings for converted user programs. */
  54 #define BPF_REG_A       BPF_REG_0
  55 #define BPF_REG_X       BPF_REG_7
  56 #define BPF_REG_TMP     BPF_REG_2       /* scratch reg */
  57 #define BPF_REG_D       BPF_REG_8       /* data, callee-saved */
  58 #define BPF_REG_H       BPF_REG_9       /* hlen, callee-saved */
  59
  60 /* Kernel hidden auxiliary/helper register. */
  61 #define BPF_REG_AX              MAX_BPF_REG
  62 #define MAX_BPF_EXT_REG         (MAX_BPF_REG + 1)
  63 #define MAX_BPF_JIT_REG         MAX_BPF_EXT_REG
  64
  65 /* unused opcode to mark special call to bpf_tail_call() helper */
  66 #define BPF_TAIL_CALL   0xf0
  67
  68 /* unused opcode to mark call to interpreter with arguments */
  69 #define BPF_CALL_ARGS   0xe0
  70
  71 /* unused opcode to mark speculation barrier for mitigating
  72  * Speculative Store Bypass
  73  */
  74 #define BPF_NOSPEC      0xc0
  75
  76 /* As per nm, we expose JITed images as text (code) section for
  77  * kallsyms. That way, tools like perf can find it to match
  78  * addresses.
  79  */
  80 #define BPF_SYM_ELF_TYPE        't'
  81
  82 /* BPF program can access up to 512 bytes of stack space. */
  83 #define MAX_BPF_STACK   512
  84
  85 /* Helper macros for filter block array initializers. */
  86
  87 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
  88
  89 #define BPF_ALU64_REG(OP, DST, SRC)                             \
  90         ((struct bpf_insn) {                                    \
  91                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
  92                 .dst_reg = DST,                                 \
  93                 .src_reg = SRC,                                 \
  94                 .off   = 0,                                     \
  95                 .imm   = 0 })
  96
  97 #define BPF_ALU32_REG(OP, DST, SRC)                             \
  98         ((struct bpf_insn) {                                    \
  99                 .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
 100                 .dst_reg = DST,                                 \
 101                 .src_reg = SRC,                                 \
 102                 .off   = 0,                                     \
 103                 .imm   = 0 })
 104
 105 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 106
 107 #define BPF_ALU64_IMM(OP, DST, IMM)                             \
 108         ((struct bpf_insn) {                                    \
 109                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
 110                 .dst_reg = DST,                                 \
 111                 .src_reg = 0,                                   \
 112                 .off   = 0,                                     \
 113                 .imm   = IMM })
 114
 115 #define BPF_ALU32_IMM(OP, DST, IMM)                             \
 116         ((struct bpf_insn) {                                    \
 117                 .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
 118                 .dst_reg = DST,                                 \
 119                 .src_reg = 0,                                   \
 120                 .off   = 0,                                     \
 121                 .imm   = IMM })
 122
 123 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
 124
 125 #define BPF_ENDIAN(TYPE, DST, LEN)                              \
 126         ((struct bpf_insn) {                                    \
 127                 .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
 128                 .dst_reg = DST,                                 \
 129                 .src_reg = 0,                                   \
 130                 .off   = 0,                                     \
 131                 .imm   = LEN })
 132
 133 /* Short form of mov, dst_reg = src_reg */
 134
 135 #define BPF_MOV64_REG(DST, SRC)                                 \
 136         ((struct bpf_insn) {                                    \
 137                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 138                 .dst_reg = DST,                                 \
 139                 .src_reg = SRC,                                 \
 140                 .off   = 0,                                     \
 141                 .imm   = 0 })
 142
 143 #define BPF_MOV32_REG(DST, SRC)                                 \
 144         ((struct bpf_insn) {                                    \
 145                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 146                 .dst_reg = DST,                                 \
 147                 .src_reg = SRC,                                 \
 148                 .off   = 0,                                     \
 149                 .imm   = 0 })
 150
 151 /* Short form of mov, dst_reg = imm32 */
 152
 153 #define BPF_MOV64_IMM(DST, IMM)                                 \
 154         ((struct bpf_insn) {                                    \
 155                 .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
 156                 .dst_reg = DST,                                 \
 157                 .src_reg = 0,                                   \
 158                 .off   = 0,                                     \
 159                 .imm   = IMM })
 160
 161 #define BPF_MOV32_IMM(DST, IMM)                                 \
 162         ((struct bpf_insn) {                                    \
 163                 .code  = BPF_ALU | BPF_MOV | BPF_K,             \
 164                 .dst_reg = DST,                                 \
 165                 .src_reg = 0,                                   \
 166                 .off   = 0,                                     \
 167                 .imm   = IMM })
 168
 169 /* Special form of mov32, used for doing explicit zero extension on dst. */
 170 #define BPF_ZEXT_REG(DST)                                       \
 171         ((struct bpf_insn) {                                    \
 172                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 173                 .dst_reg = DST,                                 \
 174                 .src_reg = DST,                                 \
 175                 .off   = 0,                                     \
 176                 .imm   = 1 })
 177
 178 static inline bool insn_is_zext(const struct bpf_insn *insn)
 179 {
 180         return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
 181 }
 182
 183 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
 184 #define BPF_LD_IMM64(DST, IMM)                                  \
 185         BPF_LD_IMM64_RAW(DST, 0, IMM)
 186
 187 #define BPF_LD_IMM64_RAW(DST, SRC, IMM)                         \
 188         ((struct bpf_insn) {                                    \
 189                 .code  = BPF_LD | BPF_DW | BPF_IMM,             \
 190                 .dst_reg = DST,                                 \
 191                 .src_reg = SRC,                                 \
 192                 .off   = 0,                                     \
 193                 .imm   = (__u32) (IMM) }),                      \
 194         ((struct bpf_insn) {                                    \
 195                 .code  = 0, /* zero is reserved opcode */       \
 196                 .dst_reg = 0,                                   \
 197                 .src_reg = 0,                                   \
 198                 .off   = 0,                                     \
 199                 .imm   = ((__u64) (IMM)) >> 32 })
 200
 201 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
 202 #define BPF_LD_MAP_FD(DST, MAP_FD)                              \
 203         BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
 204
 205 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
 206
 207 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)                      \
 208         ((struct bpf_insn) {                                    \
 209                 .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
 210                 .dst_reg = DST,                                 \
 211                 .src_reg = SRC,                                 \
 212                 .off   = 0,                                     \
 213                 .imm   = IMM })
 214
 215 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)                      \
 216         ((struct bpf_insn) {                                    \
 217                 .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
 218                 .dst_reg = DST,                                 \
 219                 .src_reg = SRC,                                 \
 220                 .off   = 0,                                     \
 221                 .imm   = IMM })
 222
 223 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
 224
 225 #define BPF_LD_ABS(SIZE, IMM)                                   \
 226         ((struct bpf_insn) {                                    \
 227                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
 228                 .dst_reg = 0,                                   \
 229                 .src_reg = 0,                                   \
 230                 .off   = 0,                                     \
 231                 .imm   = IMM })
 232
 233 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
 234
 235 #define BPF_LD_IND(SIZE, SRC, IMM)                              \
 236         ((struct bpf_insn) {                                    \
 237                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
 238                 .dst_reg = 0,                                   \
 239                 .src_reg = SRC,                                 \
 240                 .off   = 0,                                     \
 241                 .imm   = IMM })
 242
 243 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
 244
 245 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)                        \
 246         ((struct bpf_insn) {                                    \
 247                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
 248                 .dst_reg = DST,                                 \
 249                 .src_reg = SRC,                                 \
 250                 .off   = OFF,                                   \
 251                 .imm   = 0 })
 252
 253 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
 254
 255 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)                        \
 256         ((struct bpf_insn) {                                    \
 257                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
 258                 .dst_reg = DST,                                 \
 259                 .src_reg = SRC,                                 \
 260                 .off   = OFF,                                   \
 261                 .imm   = 0 })
 262
 263 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */
 264
 265 #define BPF_STX_XADD(SIZE, DST, SRC, OFF)                       \
 266         ((struct bpf_insn) {                                    \
 267                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD,   \
 268                 .dst_reg = DST,                                 \
 269                 .src_reg = SRC,                                 \
 270                 .off   = OFF,                                   \
 271                 .imm   = 0 })
 272
 273 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
 274
 275 #define BPF_ST_MEM(SIZE, DST, OFF, IMM)                         \
 276         ((struct bpf_insn) {                                    \
 277                 .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
 278                 .dst_reg = DST,                                 \
 279                 .src_reg = 0,                                   \
 280                 .off   = OFF,                                   \
 281                 .imm   = IMM })
 282
 283 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
 284
 285 #define BPF_JMP_REG(OP, DST, SRC, OFF)                          \
 286         ((struct bpf_insn) {                                    \
 287                 .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
 288                 .dst_reg = DST,                                 \
 289                 .src_reg = SRC,                                 \
 290                 .off   = OFF,                                   \
 291                 .imm   = 0 })
 292
 293 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
 294
 295 #define BPF_JMP_IMM(OP, DST, IMM, OFF)                          \
 296         ((struct bpf_insn) {                                    \
 297                 .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
 298                 .dst_reg = DST,                                 \
 299                 .src_reg = 0,                                   \
 300                 .off   = OFF,                                   \
 301                 .imm   = IMM })
 302
 303 /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
 304
 305 #define BPF_JMP32_REG(OP, DST, SRC, OFF)                        \
 306         ((struct bpf_insn) {                                    \
 307                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_X,        \
 308                 .dst_reg = DST,                                 \
 309                 .src_reg = SRC,                                 \
 310                 .off   = OFF,                                   \
 311                 .imm   = 0 })
 312
 313 /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
 314
 315 #define BPF_JMP32_IMM(OP, DST, IMM, OFF)                        \
 316         ((struct bpf_insn) {                                    \
 317                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_K,        \
 318                 .dst_reg = DST,                                 \
 319                 .src_reg = 0,                                   \
 320                 .off   = OFF,                                   \
 321                 .imm   = IMM })
 322
 323 /* Unconditional jumps, goto pc + off16 */
 324
 325 #define BPF_JMP_A(OFF)                                          \
 326         ((struct bpf_insn) {                                    \
 327                 .code  = BPF_JMP | BPF_JA,                      \
 328                 .dst_reg = 0,                                   \
 329                 .src_reg = 0,                                   \
 330                 .off   = OFF,                                   \
 331                 .imm   = 0 })
 332
 333 /* Relative call */
 334
 335 #define BPF_CALL_REL(TGT)                                       \
 336         ((struct bpf_insn) {                                    \
 337                 .code  = BPF_JMP | BPF_CALL,                    \
 338                 .dst_reg = 0,                                   \
 339                 .src_reg = BPF_PSEUDO_CALL,                     \
 340                 .off   = 0,                                     \
 341                 .imm   = TGT })
 342
 343 /* Function call */
 344
 345 #define BPF_CAST_CALL(x)                                        \
 346                 ((u64 (*)(u64, u64, u64, u64, u64))(x))
 347
 348 #define BPF_EMIT_CALL(FUNC)                                     \
 349         ((struct bpf_insn) {                                    \
 350                 .code  = BPF_JMP | BPF_CALL,                    \
 351                 .dst_reg = 0,                                   \
 352                 .src_reg = 0,                                   \
 353                 .off   = 0,                                     \
 354                 .imm   = ((FUNC) - __bpf_call_base) })
 355
 356 /* Raw code statement block */
 357
 358 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)                  \
 359         ((struct bpf_insn) {                                    \
 360                 .code  = CODE,                                  \
 361                 .dst_reg = DST,                                 \
 362                 .src_reg = SRC,                                 \
 363                 .off   = OFF,                                   \
 364                 .imm   = IMM })
 365
 366 /* Program exit */
 367
 368 #define BPF_EXIT_INSN()                                         \
 369         ((struct bpf_insn) {                                    \
 370                 .code  = BPF_JMP | BPF_EXIT,                    \
 371                 .dst_reg = 0,                                   \
 372                 .src_reg = 0,                                   \
 373                 .off   = 0,                                     \
 374                 .imm   = 0 })
 375
 376 /* Speculation barrier */
 377
 378 #define BPF_ST_NOSPEC()                                         \
 379         ((struct bpf_insn) {                                    \
 380                 .code  = BPF_ST | BPF_NOSPEC,                   \
 381                 .dst_reg = 0,                                   \
 382                 .src_reg = 0,                                   \
 383                 .off   = 0,                                     \
 384                 .imm   = 0 })
 385
 386 /* Internal classic blocks for direct assignment */
 387
 388 #define __BPF_STMT(CODE, K)                                     \
 389         ((struct sock_filter) BPF_STMT(CODE, K))
 390
 391 #define __BPF_JUMP(CODE, K, JT, JF)                             \
 392         ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
 393
 394 #define bytes_to_bpf_size(bytes)                                \
 395 ({                                                              \
 396         int bpf_size = -EINVAL;                                 \
 397                                                                 \
 398         if (bytes == sizeof(u8))                                \
 399                 bpf_size = BPF_B;                               \
 400         else if (bytes == sizeof(u16))                          \
 401                 bpf_size = BPF_H;                               \
 402         else if (bytes == sizeof(u32))                          \
 403                 bpf_size = BPF_W;                               \
 404         else if (bytes == sizeof(u64))                          \
 405                 bpf_size = BPF_DW;                              \
 406                                                                 \
 407         bpf_size;                                               \
 408 })
 409
 410 #define bpf_size_to_bytes(bpf_size)                             \
 411 ({                                                              \
 412         int bytes = -EINVAL;                                    \
 413                                                                 \
 414         if (bpf_size == BPF_B)                                  \
 415                 bytes = sizeof(u8);                             \
 416         else if (bpf_size == BPF_H)                             \
 417                 bytes = sizeof(u16);                            \
 418         else if (bpf_size == BPF_W)                             \
 419                 bytes = sizeof(u32);                            \
 420         else if (bpf_size == BPF_DW)                            \
 421                 bytes = sizeof(u64);                            \
 422                                                                 \
 423         bytes;                                                  \
 424 })
 425
 426 #define BPF_SIZEOF(type)                                        \
 427         ({                                                      \
 428                 const int __size = bytes_to_bpf_size(sizeof(type)); \
 429                 BUILD_BUG_ON(__size < 0);                       \
 430                 __size;                                         \
 431         })
 432
 433 #define BPF_FIELD_SIZEOF(type, field)                           \
 434         ({                                                      \
 435                 const int __size = bytes_to_bpf_size(FIELD_SIZEOF(type, field)); \
 436                 BUILD_BUG_ON(__size < 0);                       \
 437                 __size;                                         \
 438         })
 439
 440 #define BPF_LDST_BYTES(insn)                                    \
 441         ({                                                      \
 442                 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
 443                 WARN_ON(__size < 0);                            \
 444                 __size;                                         \
 445         })
 446
 447 #define __BPF_MAP_0(m, v, ...) v
 448 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
 449 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
 450 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
 451 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
 452 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
 453
 454 #define __BPF_REG_0(...) __BPF_PAD(5)
 455 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
 456 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
 457 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
 458 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
 459 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
 460
 461 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
 462 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
 463
 464 #define __BPF_CAST(t, a)                                                       \
 465         (__force t)                                                            \
 466         (__force                                                               \
 467          typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
 468                                       (unsigned long)0, (t)0))) a
 469 #define __BPF_V void
 470 #define __BPF_N
 471
 472 #define __BPF_DECL_ARGS(t, a) t   a
 473 #define __BPF_DECL_REGS(t, a) u64 a
 474
 475 #define __BPF_PAD(n)                                                           \
 476         __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
 477                   u64, __ur_3, u64, __ur_4, u64, __ur_5)
 478
 479 #define BPF_CALL_x(x, name, ...)                                               \
 480         static __always_inline                                                 \
 481         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
 482         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));         \
 483         u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))          \
 484         {                                                                      \
 485                 return ____##name(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
 486         }                                                                      \
 487         static __always_inline                                                 \
 488         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
 489
 490 #define BPF_CALL_0(name, ...)   BPF_CALL_x(0, name, __VA_ARGS__)
 491 #define BPF_CALL_1(name, ...)   BPF_CALL_x(1, name, __VA_ARGS__)
 492 #define BPF_CALL_2(name, ...)   BPF_CALL_x(2, name, __VA_ARGS__)
 493 #define BPF_CALL_3(name, ...)   BPF_CALL_x(3, name, __VA_ARGS__)
 494 #define BPF_CALL_4(name, ...)   BPF_CALL_x(4, name, __VA_ARGS__)
 495 #define BPF_CALL_5(name, ...)   BPF_CALL_x(5, name, __VA_ARGS__)
 496
 497 #define bpf_ctx_range(TYPE, MEMBER)                                             \
 498         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 499 #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2)                              \
 500         offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
 501 #if BITS_PER_LONG == 64
 502 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 503         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 504 #else
 505 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 506         offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
 507 #endif /* BITS_PER_LONG == 64 */
 508
 509 #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE)                            \
 510         ({                                                                      \
 511                 BUILD_BUG_ON(FIELD_SIZEOF(TYPE, MEMBER) != (SIZE));             \
 512                 *(PTR_SIZE) = (SIZE);                                           \
 513                 offsetof(TYPE, MEMBER);                                         \
 514         })
 515
 516 #ifdef CONFIG_COMPAT
 517 /* A struct sock_filter is architecture independent. */
 518 struct compat_sock_fprog {
 519         u16             len;
 520         compat_uptr_t   filter; /* struct sock_filter * */
 521 };
 522 #endif
 523
 524 struct sock_fprog_kern {
 525         u16                     len;
 526         struct sock_filter      *filter;
 527 };
 528
 529 struct bpf_binary_header {
 530         u32 pages;
 531         /* Some arches need word alignment for their instructions */
 532         u8 image[] __aligned(4);
 533 };
 534
 535 struct bpf_prog {
 536         u16                     pages;          /* Number of allocated pages */
 537         u16                     jited:1,        /* Is our filter JIT'ed? */
 538                                 jit_requested:1,/* archs need to JIT the prog */
 539                                 gpl_compatible:1, /* Is filter GPL compatible? */
 540                                 cb_access:1,    /* Is control block accessed? */
 541                                 dst_needed:1,   /* Do we need dst entry? */
 542                                 blinded:1,      /* Was blinded */
 543                                 is_func:1,      /* program is a bpf function */
 544                                 kprobe_override:1, /* Do we override a kprobe? */
 545                                 has_callchain_buf:1, /* callchain buffer allocated? */
 546                                 enforce_expected_attach_type:1; /* Enforce expected_attach_type checking at attach time */
 547         enum bpf_prog_type      type;           /* Type of BPF program */
 548         enum bpf_attach_type    expected_attach_type; /* For some prog types */
 549         u32                     len;            /* Number of filter blocks */
 550         u32                     jited_len;      /* Size of jited insns in bytes */
 551         u8                      tag[BPF_TAG_SIZE];
 552         struct bpf_prog_aux     *aux;           /* Auxiliary fields */
 553         struct sock_fprog_kern  *orig_prog;     /* Original BPF program */
 554         unsigned int            (*bpf_func)(const void *ctx,
 555                                             const struct bpf_insn *insn);
 556         /* Instructions for interpreter */
 557         union {
 558                 struct sock_filter      insns[0];
 559                 struct bpf_insn         insnsi[0];
 560         };
 561 };
 562
 563 struct sk_filter {
 564         refcount_t      refcnt;
 565         struct rcu_head rcu;
 566         struct bpf_prog *prog;
 567 };
 568
 569 DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
 570
 571 #define BPF_PROG_RUN(prog, ctx) ({                              \
 572         u32 ret;                                                \
 573         cant_sleep();                                           \
 574         if (static_branch_unlikely(&bpf_stats_enabled_key)) {   \
 575                 struct bpf_prog_stats *stats;                   \
 576                 u64 start = sched_clock();                      \
 577                 ret = (*(prog)->bpf_func)(ctx, (prog)->insnsi); \
 578                 stats = this_cpu_ptr(prog->aux->stats);         \
 579                 u64_stats_update_begin(&stats->syncp);          \
 580                 stats->cnt++;                                   \
 581                 stats->nsecs += sched_clock() - start;          \
 582                 u64_stats_update_end(&stats->syncp);            \
 583         } else {                                                \
 584                 ret = (*(prog)->bpf_func)(ctx, (prog)->insnsi); \
 585         }                                                       \
 586         ret; })
 587
 588 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
 589
 590 struct bpf_skb_data_end {
 591         struct qdisc_skb_cb qdisc_cb;
 592         void *data_meta;
 593         void *data_end;
 594 };
 595
 596 struct bpf_redirect_info {
 597         u32 flags;
 598         u32 tgt_index;
 599         void *tgt_value;
 600         struct bpf_map *map;
 601         struct bpf_map *map_to_flush;
 602         u32 kern_flags;
 603 };
 604
 605 DECLARE_PER_CPU(struct bpf_redirect_info, bpf_redirect_info);
 606
 607 /* flags for bpf_redirect_info kern_flags */
 608 #define BPF_RI_F_RF_NO_DIRECT   BIT(0)  /* no napi_direct on return_frame */
 609
 610 /* Compute the linear packet data range [data, data_end) which
 611  * will be accessed by various program types (cls_bpf, act_bpf,
 612  * lwt, ...). Subsystems allowing direct data access must (!)
 613  * ensure that cb[] area can be written to when BPF program is
 614  * invoked (otherwise cb[] save/restore is necessary).
 615  */
 616 static inline void bpf_compute_data_pointers(struct sk_buff *skb)
 617 {
 618         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 619
 620         BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb));
 621         cb->data_meta = skb->data - skb_metadata_len(skb);
 622         cb->data_end  = skb->data + skb_headlen(skb);
 623 }
 624
 625 /* Similar to bpf_compute_data_pointers(), except that save orginal
 626  * data in cb->data and cb->meta_data for restore.
 627  */
 628 static inline void bpf_compute_and_save_data_end(
 629         struct sk_buff *skb, void **saved_data_end)
 630 {
 631         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 632
 633         *saved_data_end = cb->data_end;
 634         cb->data_end  = skb->data + skb_headlen(skb);
 635 }
 636
 637 /* Restore data saved by bpf_compute_data_pointers(). */
 638 static inline void bpf_restore_data_end(
 639         struct sk_buff *skb, void *saved_data_end)
 640 {
 641         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 642
 643         cb->data_end = saved_data_end;
 644 }
 645
 646 static inline u8 *bpf_skb_cb(struct sk_buff *skb)
 647 {
 648         /* eBPF programs may read/write skb->cb[] area to transfer meta
 649          * data between tail calls. Since this also needs to work with
 650          * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
 651          *
 652          * In some socket filter cases, the cb unfortunately needs to be
 653          * saved/restored so that protocol specific skb->cb[] data won't
 654          * be lost. In any case, due to unpriviledged eBPF programs
 655          * attached to sockets, we need to clear the bpf_skb_cb() area
 656          * to not leak previous contents to user space.
 657          */
 658         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
 659         BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) !=
 660                      FIELD_SIZEOF(struct qdisc_skb_cb, data));
 661
 662         return qdisc_skb_cb(skb)->data;
 663 }
 664
 665 static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
 666                                          struct sk_buff *skb)
 667 {
 668         u8 *cb_data = bpf_skb_cb(skb);
 669         u8 cb_saved[BPF_SKB_CB_LEN];
 670         u32 res;
 671
 672         if (unlikely(prog->cb_access)) {
 673                 memcpy(cb_saved, cb_data, sizeof(cb_saved));
 674                 memset(cb_data, 0, sizeof(cb_saved));
 675         }
 676
 677         res = BPF_PROG_RUN(prog, skb);
 678
 679         if (unlikely(prog->cb_access))
 680                 memcpy(cb_data, cb_saved, sizeof(cb_saved));
 681
 682         return res;
 683 }
 684
 685 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
 686                                        struct sk_buff *skb)
 687 {
 688         u32 res;
 689
 690         preempt_disable();
 691         res = __bpf_prog_run_save_cb(prog, skb);
 692         preempt_enable();
 693         return res;
 694 }
 695
 696 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
 697                                         struct sk_buff *skb)
 698 {
 699         u8 *cb_data = bpf_skb_cb(skb);
 700         u32 res;
 701
 702         if (unlikely(prog->cb_access))
 703                 memset(cb_data, 0, BPF_SKB_CB_LEN);
 704
 705         preempt_disable();
 706         res = BPF_PROG_RUN(prog, skb);
 707         preempt_enable();
 708         return res;
 709 }
 710
 711 static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
 712                                             struct xdp_buff *xdp)
 713 {
 714         /* Caller needs to hold rcu_read_lock() (!), otherwise program
 715          * can be released while still running, or map elements could be
 716          * freed early while still having concurrent users. XDP fastpath
 717          * already takes rcu_read_lock() when fetching the program, so
 718          * it's not necessary here anymore.
 719          */
 720         return BPF_PROG_RUN(prog, xdp);
 721 }
 722
 723 static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
 724 {
 725         return prog->len * sizeof(struct bpf_insn);
 726 }
 727
 728 static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
 729 {
 730         return round_up(bpf_prog_insn_size(prog) +
 731                         sizeof(__be64) + 1, SHA_MESSAGE_BYTES);
 732 }
 733
 734 static inline unsigned int bpf_prog_size(unsigned int proglen)
 735 {
 736         return max(sizeof(struct bpf_prog),
 737                    offsetof(struct bpf_prog, insns[proglen]));
 738 }
 739
 740 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
 741 {
 742         /* When classic BPF programs have been loaded and the arch
 743          * does not have a classic BPF JIT (anymore), they have been
 744          * converted via bpf_migrate_filter() to eBPF and thus always
 745          * have an unspec program type.
 746          */
 747         return prog->type == BPF_PROG_TYPE_UNSPEC;
 748 }
 749
 750 static inline u32 bpf_ctx_off_adjust_machine(u32 size)
 751 {
 752         const u32 size_machine = sizeof(unsigned long);
 753
 754         if (size > size_machine && size % size_machine == 0)
 755                 size = size_machine;
 756
 757         return size;
 758 }
 759
 760 static inline bool
 761 bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
 762 {
 763         return size <= size_default && (size & (size - 1)) == 0;
 764 }
 765
 766 static inline u8
 767 bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
 768 {
 769         u8 access_off = off & (size_default - 1);
 770
 771 #ifdef __LITTLE_ENDIAN
 772         return access_off;
 773 #else
 774         return size_default - (access_off + size);
 775 #endif
 776 }
 777
 778 #define bpf_ctx_wide_access_ok(off, size, type, field)                  \
 779         (size == sizeof(__u64) &&                                       \
 780         off >= offsetof(type, field) &&                                 \
 781         off + sizeof(__u64) <= offsetofend(type, field) &&              \
 782         off % sizeof(__u64) == 0)
 783
 784 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
 785
 786 static inline void bpf_prog_lock_ro(struct bpf_prog *fp)
 787 {
 788 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
 789         if (!fp->jited) {
 790                 set_vm_flush_reset_perms(fp);
 791                 set_memory_ro((unsigned long)fp, fp->pages);
 792         }
 793 #endif
 794 }
 795
 796 static inline void bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
 797 {
 798         set_vm_flush_reset_perms(hdr);
 799         set_memory_ro((unsigned long)hdr, hdr->pages);
 800         set_memory_x((unsigned long)hdr, hdr->pages);
 801 }
 802
 803 static inline struct bpf_binary_header *
 804 bpf_jit_binary_hdr(const struct bpf_prog *fp)
 805 {
 806         unsigned long real_start = (unsigned long)fp->bpf_func;
 807         unsigned long addr = real_start & PAGE_MASK;
 808
 809         return (void *)addr;
 810 }
 811
 812 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
 813 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
 814 {
 815         return sk_filter_trim_cap(sk, skb, 1);
 816 }
 817
 818 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
 819 void bpf_prog_free(struct bpf_prog *fp);
 820
 821 bool bpf_opcode_in_insntable(u8 code);
 822
 823 void bpf_prog_free_linfo(struct bpf_prog *prog);
 824 void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
 825                                const u32 *insn_to_jit_off);
 826 int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
 827 void bpf_prog_free_jited_linfo(struct bpf_prog *prog);
 828 void bpf_prog_free_unused_jited_linfo(struct bpf_prog *prog);
 829
 830 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
 831 struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
 832 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
 833                                   gfp_t gfp_extra_flags);
 834 void __bpf_prog_free(struct bpf_prog *fp);
 835
 836 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
 837 {
 838         __bpf_prog_free(fp);
 839 }
 840
 841 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
 842                                        unsigned int flen);
 843
 844 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
 845 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
 846                               bpf_aux_classic_check_t trans, bool save_orig);
 847 void bpf_prog_destroy(struct bpf_prog *fp);
 848
 849 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 850 int sk_attach_bpf(u32 ufd, struct sock *sk);
 851 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
 852 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
 853 void sk_reuseport_prog_free(struct bpf_prog *prog);
 854 int sk_detach_filter(struct sock *sk);
 855 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
 856                   unsigned int len);
 857
 858 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
 859 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
 860
 861 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 862 #define __bpf_call_base_args \
 863         ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
 864          (void *)__bpf_call_base)
 865
 866 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
 867 void bpf_jit_compile(struct bpf_prog *prog);
 868 bool bpf_jit_needs_zext(void);
 869 bool bpf_helper_changes_pkt_data(void *func);
 870
 871 static inline bool bpf_dump_raw_ok(const struct cred *cred)
 872 {
 873         /* Reconstruction of call-sites is dependent on kallsyms,
 874          * thus make dump the same restriction.
 875          */
 876         return kallsyms_show_value(cred);
 877 }
 878
 879 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
 880                                        const struct bpf_insn *patch, u32 len);
 881 int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
 882
 883 void bpf_clear_redirect_map(struct bpf_map *map);
 884
 885 static inline bool xdp_return_frame_no_direct(void)
 886 {
 887         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 888
 889         return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
 890 }
 891
 892 static inline void xdp_set_return_frame_no_direct(void)
 893 {
 894         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 895
 896         ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
 897 }
 898
 899 static inline void xdp_clear_return_frame_no_direct(void)
 900 {
 901         struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
 902
 903         ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
 904 }
 905
 906 static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
 907                                  unsigned int pktlen)
 908 {
 909         unsigned int len;
 910
 911         if (unlikely(!(fwd->flags & IFF_UP)))
 912                 return -ENETDOWN;
 913
 914         len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
 915         if (pktlen > len)
 916                 return -EMSGSIZE;
 917
 918         return 0;
 919 }
 920
 921 /* The pair of xdp_do_redirect and xdp_do_flush_map MUST be called in the
 922  * same cpu context. Further for best results no more than a single map
 923  * for the do_redirect/do_flush pair should be used. This limitation is
 924  * because we only track one map and force a flush when the map changes.
 925  * This does not appear to be a real limitation for existing software.
 926  */
 927 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
 928                             struct xdp_buff *xdp, struct bpf_prog *prog);
 929 int xdp_do_redirect(struct net_device *dev,
 930                     struct xdp_buff *xdp,
 931                     struct bpf_prog *prog);
 932 void xdp_do_flush_map(void);
 933
 934 void bpf_warn_invalid_xdp_action(u32 act);
 935
 936 #ifdef CONFIG_INET
 937 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 938                                   struct bpf_prog *prog, struct sk_buff *skb,
 939                                   u32 hash);
 940 #else
 941 static inline struct sock *
 942 bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
 943                      struct bpf_prog *prog, struct sk_buff *skb,
 944                      u32 hash)
 945 {
 946         return NULL;
 947 }
 948 #endif
 949
 950 #ifdef CONFIG_BPF_JIT
 951 extern int bpf_jit_enable;
 952 extern int bpf_jit_harden;
 953 extern int bpf_jit_kallsyms;
 954 extern long bpf_jit_limit;
 955 extern long bpf_jit_limit_max;
 956
 957 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
 958
 959 struct bpf_binary_header *
 960 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
 961                      unsigned int alignment,
 962                      bpf_jit_fill_hole_t bpf_fill_ill_insns);
 963 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
 964 u64 bpf_jit_alloc_exec_limit(void);
 965 void *bpf_jit_alloc_exec(unsigned long size);
 966 void bpf_jit_free_exec(void *addr);
 967 void bpf_jit_free(struct bpf_prog *fp);
 968
 969 int bpf_jit_get_func_addr(const struct bpf_prog *prog,
 970                           const struct bpf_insn *insn, bool extra_pass,
 971                           u64 *func_addr, bool *func_addr_fixed);
 972
 973 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
 974 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
 975
 976 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
 977                                 u32 pass, void *image)
 978 {
 979         pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
 980                proglen, pass, image, current->comm, task_pid_nr(current));
 981
 982         if (image)
 983                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
 984                                16, 1, image, proglen, false);
 985 }
 986
 987 static inline bool bpf_jit_is_ebpf(void)
 988 {
 989 # ifdef CONFIG_HAVE_EBPF_JIT
 990         return true;
 991 # else
 992         return false;
 993 # endif
 994 }
 995
 996 static inline bool ebpf_jit_enabled(void)
 997 {
 998         return bpf_jit_enable && bpf_jit_is_ebpf();
 999 }
1000
1001 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1002 {
1003         return fp->jited && bpf_jit_is_ebpf();
1004 }
1005
1006 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1007 {
1008         /* These are the prerequisites, should someone ever have the
1009          * idea to call blinding outside of them, we make sure to
1010          * bail out.
1011          */
1012         if (!bpf_jit_is_ebpf())
1013                 return false;
1014         if (!prog->jit_requested)
1015                 return false;
1016         if (!bpf_jit_harden)
1017                 return false;
1018         if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN))
1019                 return false;
1020
1021         return true;
1022 }
1023
1024 static inline bool bpf_jit_kallsyms_enabled(void)
1025 {
1026         /* There are a couple of corner cases where kallsyms should
1027          * not be enabled f.e. on hardening.
1028          */
1029         if (bpf_jit_harden)
1030                 return false;
1031         if (!bpf_jit_kallsyms)
1032                 return false;
1033         if (bpf_jit_kallsyms == 1)
1034                 return true;
1035
1036         return false;
1037 }
1038
1039 const char *__bpf_address_lookup(unsigned long addr, unsigned long *size,
1040                                  unsigned long *off, char *sym);
1041 bool is_bpf_text_address(unsigned long addr);
1042 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
1043                     char *sym);
1044
1045 static inline const char *
1046 bpf_address_lookup(unsigned long addr, unsigned long *size,
1047                    unsigned long *off, char **modname, char *sym)
1048 {
1049         const char *ret = __bpf_address_lookup(addr, size, off, sym);
1050
1051         if (ret && modname)
1052                 *modname = NULL;
1053         return ret;
1054 }
1055
1056 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1057 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1058 void bpf_get_prog_name(const struct bpf_prog *prog, char *sym);
1059
1060 #else /* CONFIG_BPF_JIT */
1061
1062 static inline bool ebpf_jit_enabled(void)
1063 {
1064         return false;
1065 }
1066
1067 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1068 {
1069         return false;
1070 }
1071
1072 static inline void bpf_jit_free(struct bpf_prog *fp)
1073 {
1074         bpf_prog_unlock_free(fp);
1075 }
1076
1077 static inline bool bpf_jit_kallsyms_enabled(void)
1078 {
1079         return false;
1080 }
1081
1082 static inline const char *
1083 __bpf_address_lookup(unsigned long addr, unsigned long *size,
1084                      unsigned long *off, char *sym)
1085 {
1086         return NULL;
1087 }
1088
1089 static inline bool is_bpf_text_address(unsigned long addr)
1090 {
1091         return false;
1092 }
1093
1094 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1095                                   char *type, char *sym)
1096 {
1097         return -ERANGE;
1098 }
1099
1100 static inline const char *
1101 bpf_address_lookup(unsigned long addr, unsigned long *size,
1102                    unsigned long *off, char **modname, char *sym)
1103 {
1104         return NULL;
1105 }
1106
1107 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1108 {
1109 }
1110
1111 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1112 {
1113 }
1114
1115 static inline void bpf_get_prog_name(const struct bpf_prog *prog, char *sym)
1116 {
1117         sym[0] = '\0';
1118 }
1119
1120 #endif /* CONFIG_BPF_JIT */
1121
1122 void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1123
1124 #define BPF_ANC         BIT(15)
1125
1126 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1127 {
1128         switch (first->code) {
1129         case BPF_RET | BPF_K:
1130         case BPF_LD | BPF_W | BPF_LEN:
1131                 return false;
1132
1133         case BPF_LD | BPF_W | BPF_ABS:
1134         case BPF_LD | BPF_H | BPF_ABS:
1135         case BPF_LD | BPF_B | BPF_ABS:
1136                 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1137                         return true;
1138                 return false;
1139
1140         default:
1141                 return true;
1142         }
1143 }
1144
1145 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1146 {
1147         BUG_ON(ftest->code & BPF_ANC);
1148
1149         switch (ftest->code) {
1150         case BPF_LD | BPF_W | BPF_ABS:
1151         case BPF_LD | BPF_H | BPF_ABS:
1152         case BPF_LD | BPF_B | BPF_ABS:
1153 #define BPF_ANCILLARY(CODE)     case SKF_AD_OFF + SKF_AD_##CODE:        \
1154                                 return BPF_ANC | SKF_AD_##CODE
1155                 switch (ftest->k) {
1156                 BPF_ANCILLARY(PROTOCOL);
1157                 BPF_ANCILLARY(PKTTYPE);
1158                 BPF_ANCILLARY(IFINDEX);
1159                 BPF_ANCILLARY(NLATTR);
1160                 BPF_ANCILLARY(NLATTR_NEST);
1161                 BPF_ANCILLARY(MARK);
1162                 BPF_ANCILLARY(QUEUE);
1163                 BPF_ANCILLARY(HATYPE);
1164                 BPF_ANCILLARY(RXHASH);
1165                 BPF_ANCILLARY(CPU);
1166                 BPF_ANCILLARY(ALU_XOR_X);
1167                 BPF_ANCILLARY(VLAN_TAG);
1168                 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1169                 BPF_ANCILLARY(PAY_OFFSET);
1170                 BPF_ANCILLARY(RANDOM);
1171                 BPF_ANCILLARY(VLAN_TPID);
1172                 }
1173                 /* Fallthrough. */
1174         default:
1175                 return ftest->code;
1176         }
1177 }
1178
1179 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1180                                            int k, unsigned int size);
1181
1182 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k,
1183                                      unsigned int size, void *buffer)
1184 {
1185         if (k >= 0)
1186                 return skb_header_pointer(skb, k, size, buffer);
1187
1188         return bpf_internal_load_pointer_neg_helper(skb, k, size);
1189 }
1190
1191 static inline int bpf_tell_extensions(void)
1192 {
1193         return SKF_AD_MAX;
1194 }
1195
1196 struct bpf_sock_addr_kern {
1197         struct sock *sk;
1198         struct sockaddr *uaddr;
1199         /* Temporary "register" to make indirect stores to nested structures
1200          * defined above. We need three registers to make such a store, but
1201          * only two (src and dst) are available at convert_ctx_access time
1202          */
1203         u64 tmp_reg;
1204         void *t_ctx;    /* Attach type specific context. */
1205 };
1206
1207 struct bpf_sock_ops_kern {
1208         struct  sock *sk;
1209         u32     op;
1210         union {
1211                 u32 args[4];
1212                 u32 reply;
1213                 u32 replylong[4];
1214         };
1215         u32     is_fullsock;
1216         u64     temp;                   /* temp and everything after is not
1217                                          * initialized to 0 before calling
1218                                          * the BPF program. New fields that
1219                                          * should be initialized to 0 should
1220                                          * be inserted before temp.
1221                                          * temp is scratch storage used by
1222                                          * sock_ops_convert_ctx_access
1223                                          * as temporary storage of a register.
1224                                          */
1225 };
1226
1227 struct bpf_sysctl_kern {
1228         struct ctl_table_header *head;
1229         struct ctl_table *table;
1230         void *cur_val;
1231         size_t cur_len;
1232         void *new_val;
1233         size_t new_len;
1234         int new_updated;
1235         int write;
1236         loff_t *ppos;
1237         /* Temporary "register" for indirect stores to ppos. */
1238         u64 tmp_reg;
1239 };
1240
1241 struct bpf_sockopt_kern {
1242         struct sock     *sk;
1243         u8              *optval;
1244         u8              *optval_end;
1245         s32             level;
1246         s32             optname;
1247         s32             optlen;
1248         s32             retval;
1249 };
1250
1251 #endif /* __LINUX_FILTER_H__ */