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 <linux/atomic.h>
   9 #include <linux/bpf.h>
  10 #include <linux/refcount.h>
  11 #include <linux/compat.h>
  12 #include <linux/skbuff.h>
  13 #include <linux/linkage.h>
  14 #include <linux/printk.h>
  15 #include <linux/workqueue.h>
  16 #include <linux/sched.h>
  17 #include <linux/sched/clock.h>
  18 #include <linux/capability.h>
  19 #include <linux/set_memory.h>
  20 #include <linux/kallsyms.h>
  21 #include <linux/if_vlan.h>
  22 #include <linux/vmalloc.h>
  23 #include <linux/sockptr.h>
  24 #include <crypto/sha1.h>
  25 #include <linux/u64_stats_sync.h>
  26
  27 #include <net/sch_generic.h>
  28
  29 #include <asm/byteorder.h>
  30 #include <uapi/linux/filter.h>
  31
  32 struct sk_buff;
  33 struct sock;
  34 struct seccomp_data;
  35 struct bpf_prog_aux;
  36 struct xdp_rxq_info;
  37 struct xdp_buff;
  38 struct sock_reuseport;
  39 struct ctl_table;
  40 struct ctl_table_header;
  41
  42 /* ArgX, context and stack frame pointer register positions. Note,
  43  * Arg1, Arg2, Arg3, etc are used as argument mappings of function
  44  * calls in BPF_CALL instruction.
  45  */
  46 #define BPF_REG_ARG1    BPF_REG_1
  47 #define BPF_REG_ARG2    BPF_REG_2
  48 #define BPF_REG_ARG3    BPF_REG_3
  49 #define BPF_REG_ARG4    BPF_REG_4
  50 #define BPF_REG_ARG5    BPF_REG_5
  51 #define BPF_REG_CTX     BPF_REG_6
  52 #define BPF_REG_FP      BPF_REG_10
  53
  54 /* Additional register mappings for converted user programs. */
  55 #define BPF_REG_A       BPF_REG_0
  56 #define BPF_REG_X       BPF_REG_7
  57 #define BPF_REG_TMP     BPF_REG_2       /* scratch reg */
  58 #define BPF_REG_D       BPF_REG_8       /* data, callee-saved */
  59 #define BPF_REG_H       BPF_REG_9       /* hlen, callee-saved */
  60
  61 /* Kernel hidden auxiliary/helper register. */
  62 #define BPF_REG_AX              MAX_BPF_REG
  63 #define MAX_BPF_EXT_REG         (MAX_BPF_REG + 1)
  64 #define MAX_BPF_JIT_REG         MAX_BPF_EXT_REG
  65
  66 /* unused opcode to mark special call to bpf_tail_call() helper */
  67 #define BPF_TAIL_CALL   0xf0
  68
  69 /* unused opcode to mark special load instruction. Same as BPF_ABS */
  70 #define BPF_PROBE_MEM   0x20
  71
  72 /* unused opcode to mark special ldsx instruction. Same as BPF_IND */
  73 #define BPF_PROBE_MEMSX 0x40
  74
  75 /* unused opcode to mark special load instruction. Same as BPF_MSH */
  76 #define BPF_PROBE_MEM32 0xa0
  77
  78 /* unused opcode to mark special atomic instruction */
  79 #define BPF_PROBE_ATOMIC 0xe0
  80
  81 /* unused opcode to mark call to interpreter with arguments */
  82 #define BPF_CALL_ARGS   0xe0
  83
  84 /* unused opcode to mark speculation barrier for mitigating
  85  * Speculative Store Bypass
  86  */
  87 #define BPF_NOSPEC      0xc0
  88
  89 /* As per nm, we expose JITed images as text (code) section for
  90  * kallsyms. That way, tools like perf can find it to match
  91  * addresses.
  92  */
  93 #define BPF_SYM_ELF_TYPE        't'
  94
  95 /* BPF program can access up to 512 bytes of stack space. */
  96 #define MAX_BPF_STACK   512
  97
  98 /* Helper macros for filter block array initializers. */
  99
 100 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */
 101
 102 #define BPF_ALU64_REG_OFF(OP, DST, SRC, OFF)                    \
 103         ((struct bpf_insn) {                                    \
 104                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_X,        \
 105                 .dst_reg = DST,                                 \
 106                 .src_reg = SRC,                                 \
 107                 .off   = OFF,                                   \
 108                 .imm   = 0 })
 109
 110 #define BPF_ALU64_REG(OP, DST, SRC)                             \
 111         BPF_ALU64_REG_OFF(OP, DST, SRC, 0)
 112
 113 #define BPF_ALU32_REG_OFF(OP, DST, SRC, OFF)                    \
 114         ((struct bpf_insn) {                                    \
 115                 .code  = BPF_ALU | BPF_OP(OP) | BPF_X,          \
 116                 .dst_reg = DST,                                 \
 117                 .src_reg = SRC,                                 \
 118                 .off   = OFF,                                   \
 119                 .imm   = 0 })
 120
 121 #define BPF_ALU32_REG(OP, DST, SRC)                             \
 122         BPF_ALU32_REG_OFF(OP, DST, SRC, 0)
 123
 124 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */
 125
 126 #define BPF_ALU64_IMM_OFF(OP, DST, IMM, OFF)                    \
 127         ((struct bpf_insn) {                                    \
 128                 .code  = BPF_ALU64 | BPF_OP(OP) | BPF_K,        \
 129                 .dst_reg = DST,                                 \
 130                 .src_reg = 0,                                   \
 131                 .off   = OFF,                                   \
 132                 .imm   = IMM })
 133 #define BPF_ALU64_IMM(OP, DST, IMM)                             \
 134         BPF_ALU64_IMM_OFF(OP, DST, IMM, 0)
 135
 136 #define BPF_ALU32_IMM_OFF(OP, DST, IMM, OFF)                    \
 137         ((struct bpf_insn) {                                    \
 138                 .code  = BPF_ALU | BPF_OP(OP) | BPF_K,          \
 139                 .dst_reg = DST,                                 \
 140                 .src_reg = 0,                                   \
 141                 .off   = OFF,                                   \
 142                 .imm   = IMM })
 143 #define BPF_ALU32_IMM(OP, DST, IMM)                             \
 144         BPF_ALU32_IMM_OFF(OP, DST, IMM, 0)
 145
 146 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */
 147
 148 #define BPF_ENDIAN(TYPE, DST, LEN)                              \
 149         ((struct bpf_insn) {                                    \
 150                 .code  = BPF_ALU | BPF_END | BPF_SRC(TYPE),     \
 151                 .dst_reg = DST,                                 \
 152                 .src_reg = 0,                                   \
 153                 .off   = 0,                                     \
 154                 .imm   = LEN })
 155
 156 /* Byte Swap, bswap16/32/64 */
 157
 158 #define BPF_BSWAP(DST, LEN)                                     \
 159         ((struct bpf_insn) {                                    \
 160                 .code  = BPF_ALU64 | BPF_END | BPF_SRC(BPF_TO_LE),      \
 161                 .dst_reg = DST,                                 \
 162                 .src_reg = 0,                                   \
 163                 .off   = 0,                                     \
 164                 .imm   = LEN })
 165
 166 /* Short form of mov, dst_reg = src_reg */
 167
 168 #define BPF_MOV64_REG(DST, SRC)                                 \
 169         ((struct bpf_insn) {                                    \
 170                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 171                 .dst_reg = DST,                                 \
 172                 .src_reg = SRC,                                 \
 173                 .off   = 0,                                     \
 174                 .imm   = 0 })
 175
 176 #define BPF_MOV32_REG(DST, SRC)                                 \
 177         ((struct bpf_insn) {                                    \
 178                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 179                 .dst_reg = DST,                                 \
 180                 .src_reg = SRC,                                 \
 181                 .off   = 0,                                     \
 182                 .imm   = 0 })
 183
 184 /* Special (internal-only) form of mov, used to resolve per-CPU addrs:
 185  * dst_reg = src_reg + <percpu_base_off>
 186  * BPF_ADDR_PERCPU is used as a special insn->off value.
 187  */
 188 #define BPF_ADDR_PERCPU (-1)
 189
 190 #define BPF_MOV64_PERCPU_REG(DST, SRC)                          \
 191         ((struct bpf_insn) {                                    \
 192                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 193                 .dst_reg = DST,                                 \
 194                 .src_reg = SRC,                                 \
 195                 .off   = BPF_ADDR_PERCPU,                       \
 196                 .imm   = 0 })
 197
 198 static inline bool insn_is_mov_percpu_addr(const struct bpf_insn *insn)
 199 {
 200         return insn->code == (BPF_ALU64 | BPF_MOV | BPF_X) && insn->off == BPF_ADDR_PERCPU;
 201 }
 202
 203 /* Short form of mov, dst_reg = imm32 */
 204
 205 #define BPF_MOV64_IMM(DST, IMM)                                 \
 206         ((struct bpf_insn) {                                    \
 207                 .code  = BPF_ALU64 | BPF_MOV | BPF_K,           \
 208                 .dst_reg = DST,                                 \
 209                 .src_reg = 0,                                   \
 210                 .off   = 0,                                     \
 211                 .imm   = IMM })
 212
 213 #define BPF_MOV32_IMM(DST, IMM)                                 \
 214         ((struct bpf_insn) {                                    \
 215                 .code  = BPF_ALU | BPF_MOV | BPF_K,             \
 216                 .dst_reg = DST,                                 \
 217                 .src_reg = 0,                                   \
 218                 .off   = 0,                                     \
 219                 .imm   = IMM })
 220
 221 /* Short form of movsx, dst_reg = (s8,s16,s32)src_reg */
 222
 223 #define BPF_MOVSX64_REG(DST, SRC, OFF)                          \
 224         ((struct bpf_insn) {                                    \
 225                 .code  = BPF_ALU64 | BPF_MOV | BPF_X,           \
 226                 .dst_reg = DST,                                 \
 227                 .src_reg = SRC,                                 \
 228                 .off   = OFF,                                   \
 229                 .imm   = 0 })
 230
 231 #define BPF_MOVSX32_REG(DST, SRC, OFF)                          \
 232         ((struct bpf_insn) {                                    \
 233                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 234                 .dst_reg = DST,                                 \
 235                 .src_reg = SRC,                                 \
 236                 .off   = OFF,                                   \
 237                 .imm   = 0 })
 238
 239 /* Special form of mov32, used for doing explicit zero extension on dst. */
 240 #define BPF_ZEXT_REG(DST)                                       \
 241         ((struct bpf_insn) {                                    \
 242                 .code  = BPF_ALU | BPF_MOV | BPF_X,             \
 243                 .dst_reg = DST,                                 \
 244                 .src_reg = DST,                                 \
 245                 .off   = 0,                                     \
 246                 .imm   = 1 })
 247
 248 static inline bool insn_is_zext(const struct bpf_insn *insn)
 249 {
 250         return insn->code == (BPF_ALU | BPF_MOV | BPF_X) && insn->imm == 1;
 251 }
 252
 253 /* addr_space_cast from as(0) to as(1) is for converting bpf arena pointers
 254  * to pointers in user vma.
 255  */
 256 static inline bool insn_is_cast_user(const struct bpf_insn *insn)
 257 {
 258         return insn->code == (BPF_ALU64 | BPF_MOV | BPF_X) &&
 259                               insn->off == BPF_ADDR_SPACE_CAST &&
 260                               insn->imm == 1U << 16;
 261 }
 262
 263 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */
 264 #define BPF_LD_IMM64(DST, IMM)                                  \
 265         BPF_LD_IMM64_RAW(DST, 0, IMM)
 266
 267 #define BPF_LD_IMM64_RAW(DST, SRC, IMM)                         \
 268         ((struct bpf_insn) {                                    \
 269                 .code  = BPF_LD | BPF_DW | BPF_IMM,             \
 270                 .dst_reg = DST,                                 \
 271                 .src_reg = SRC,                                 \
 272                 .off   = 0,                                     \
 273                 .imm   = (__u32) (IMM) }),                      \
 274         ((struct bpf_insn) {                                    \
 275                 .code  = 0, /* zero is reserved opcode */       \
 276                 .dst_reg = 0,                                   \
 277                 .src_reg = 0,                                   \
 278                 .off   = 0,                                     \
 279                 .imm   = ((__u64) (IMM)) >> 32 })
 280
 281 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */
 282 #define BPF_LD_MAP_FD(DST, MAP_FD)                              \
 283         BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD)
 284
 285 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */
 286
 287 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM)                      \
 288         ((struct bpf_insn) {                                    \
 289                 .code  = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE),   \
 290                 .dst_reg = DST,                                 \
 291                 .src_reg = SRC,                                 \
 292                 .off   = 0,                                     \
 293                 .imm   = IMM })
 294
 295 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM)                      \
 296         ((struct bpf_insn) {                                    \
 297                 .code  = BPF_ALU | BPF_MOV | BPF_SRC(TYPE),     \
 298                 .dst_reg = DST,                                 \
 299                 .src_reg = SRC,                                 \
 300                 .off   = 0,                                     \
 301                 .imm   = IMM })
 302
 303 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */
 304
 305 #define BPF_LD_ABS(SIZE, IMM)                                   \
 306         ((struct bpf_insn) {                                    \
 307                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS,     \
 308                 .dst_reg = 0,                                   \
 309                 .src_reg = 0,                                   \
 310                 .off   = 0,                                     \
 311                 .imm   = IMM })
 312
 313 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */
 314
 315 #define BPF_LD_IND(SIZE, SRC, IMM)                              \
 316         ((struct bpf_insn) {                                    \
 317                 .code  = BPF_LD | BPF_SIZE(SIZE) | BPF_IND,     \
 318                 .dst_reg = 0,                                   \
 319                 .src_reg = SRC,                                 \
 320                 .off   = 0,                                     \
 321                 .imm   = IMM })
 322
 323 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */
 324
 325 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF)                        \
 326         ((struct bpf_insn) {                                    \
 327                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM,    \
 328                 .dst_reg = DST,                                 \
 329                 .src_reg = SRC,                                 \
 330                 .off   = OFF,                                   \
 331                 .imm   = 0 })
 332
 333 /* Memory load, dst_reg = *(signed size *) (src_reg + off16) */
 334
 335 #define BPF_LDX_MEMSX(SIZE, DST, SRC, OFF)                      \
 336         ((struct bpf_insn) {                                    \
 337                 .code  = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEMSX,  \
 338                 .dst_reg = DST,                                 \
 339                 .src_reg = SRC,                                 \
 340                 .off   = OFF,                                   \
 341                 .imm   = 0 })
 342
 343 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */
 344
 345 #define BPF_STX_MEM(SIZE, DST, SRC, OFF)                        \
 346         ((struct bpf_insn) {                                    \
 347                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM,    \
 348                 .dst_reg = DST,                                 \
 349                 .src_reg = SRC,                                 \
 350                 .off   = OFF,                                   \
 351                 .imm   = 0 })
 352
 353
 354 /*
 355  * Atomic operations:
 356  *
 357  *   BPF_ADD                  *(uint *) (dst_reg + off16) += src_reg
 358  *   BPF_AND                  *(uint *) (dst_reg + off16) &= src_reg
 359  *   BPF_OR                   *(uint *) (dst_reg + off16) |= src_reg
 360  *   BPF_XOR                  *(uint *) (dst_reg + off16) ^= src_reg
 361  *   BPF_ADD | BPF_FETCH      src_reg = atomic_fetch_add(dst_reg + off16, src_reg);
 362  *   BPF_AND | BPF_FETCH      src_reg = atomic_fetch_and(dst_reg + off16, src_reg);
 363  *   BPF_OR | BPF_FETCH       src_reg = atomic_fetch_or(dst_reg + off16, src_reg);
 364  *   BPF_XOR | BPF_FETCH      src_reg = atomic_fetch_xor(dst_reg + off16, src_reg);
 365  *   BPF_XCHG                 src_reg = atomic_xchg(dst_reg + off16, src_reg)
 366  *   BPF_CMPXCHG              r0 = atomic_cmpxchg(dst_reg + off16, r0, src_reg)
 367  */
 368
 369 #define BPF_ATOMIC_OP(SIZE, OP, DST, SRC, OFF)                  \
 370         ((struct bpf_insn) {                                    \
 371                 .code  = BPF_STX | BPF_SIZE(SIZE) | BPF_ATOMIC, \
 372                 .dst_reg = DST,                                 \
 373                 .src_reg = SRC,                                 \
 374                 .off   = OFF,                                   \
 375                 .imm   = OP })
 376
 377 /* Legacy alias */
 378 #define BPF_STX_XADD(SIZE, DST, SRC, OFF) BPF_ATOMIC_OP(SIZE, BPF_ADD, DST, SRC, OFF)
 379
 380 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */
 381
 382 #define BPF_ST_MEM(SIZE, DST, OFF, IMM)                         \
 383         ((struct bpf_insn) {                                    \
 384                 .code  = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM,     \
 385                 .dst_reg = DST,                                 \
 386                 .src_reg = 0,                                   \
 387                 .off   = OFF,                                   \
 388                 .imm   = IMM })
 389
 390 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */
 391
 392 #define BPF_JMP_REG(OP, DST, SRC, OFF)                          \
 393         ((struct bpf_insn) {                                    \
 394                 .code  = BPF_JMP | BPF_OP(OP) | BPF_X,          \
 395                 .dst_reg = DST,                                 \
 396                 .src_reg = SRC,                                 \
 397                 .off   = OFF,                                   \
 398                 .imm   = 0 })
 399
 400 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */
 401
 402 #define BPF_JMP_IMM(OP, DST, IMM, OFF)                          \
 403         ((struct bpf_insn) {                                    \
 404                 .code  = BPF_JMP | BPF_OP(OP) | BPF_K,          \
 405                 .dst_reg = DST,                                 \
 406                 .src_reg = 0,                                   \
 407                 .off   = OFF,                                   \
 408                 .imm   = IMM })
 409
 410 /* Like BPF_JMP_REG, but with 32-bit wide operands for comparison. */
 411
 412 #define BPF_JMP32_REG(OP, DST, SRC, OFF)                        \
 413         ((struct bpf_insn) {                                    \
 414                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_X,        \
 415                 .dst_reg = DST,                                 \
 416                 .src_reg = SRC,                                 \
 417                 .off   = OFF,                                   \
 418                 .imm   = 0 })
 419
 420 /* Like BPF_JMP_IMM, but with 32-bit wide operands for comparison. */
 421
 422 #define BPF_JMP32_IMM(OP, DST, IMM, OFF)                        \
 423         ((struct bpf_insn) {                                    \
 424                 .code  = BPF_JMP32 | BPF_OP(OP) | BPF_K,        \
 425                 .dst_reg = DST,                                 \
 426                 .src_reg = 0,                                   \
 427                 .off   = OFF,                                   \
 428                 .imm   = IMM })
 429
 430 /* Unconditional jumps, goto pc + off16 */
 431
 432 #define BPF_JMP_A(OFF)                                          \
 433         ((struct bpf_insn) {                                    \
 434                 .code  = BPF_JMP | BPF_JA,                      \
 435                 .dst_reg = 0,                                   \
 436                 .src_reg = 0,                                   \
 437                 .off   = OFF,                                   \
 438                 .imm   = 0 })
 439
 440 /* Unconditional jumps, gotol pc + imm32 */
 441
 442 #define BPF_JMP32_A(IMM)                                        \
 443         ((struct bpf_insn) {                                    \
 444                 .code  = BPF_JMP32 | BPF_JA,                    \
 445                 .dst_reg = 0,                                   \
 446                 .src_reg = 0,                                   \
 447                 .off   = 0,                                     \
 448                 .imm   = IMM })
 449
 450 /* Relative call */
 451
 452 #define BPF_CALL_REL(TGT)                                       \
 453         ((struct bpf_insn) {                                    \
 454                 .code  = BPF_JMP | BPF_CALL,                    \
 455                 .dst_reg = 0,                                   \
 456                 .src_reg = BPF_PSEUDO_CALL,                     \
 457                 .off   = 0,                                     \
 458                 .imm   = TGT })
 459
 460 /* Convert function address to BPF immediate */
 461
 462 #define BPF_CALL_IMM(x) ((void *)(x) - (void *)__bpf_call_base)
 463
 464 #define BPF_EMIT_CALL(FUNC)                                     \
 465         ((struct bpf_insn) {                                    \
 466                 .code  = BPF_JMP | BPF_CALL,                    \
 467                 .dst_reg = 0,                                   \
 468                 .src_reg = 0,                                   \
 469                 .off   = 0,                                     \
 470                 .imm   = BPF_CALL_IMM(FUNC) })
 471
 472 /* Raw code statement block */
 473
 474 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM)                  \
 475         ((struct bpf_insn) {                                    \
 476                 .code  = CODE,                                  \
 477                 .dst_reg = DST,                                 \
 478                 .src_reg = SRC,                                 \
 479                 .off   = OFF,                                   \
 480                 .imm   = IMM })
 481
 482 /* Program exit */
 483
 484 #define BPF_EXIT_INSN()                                         \
 485         ((struct bpf_insn) {                                    \
 486                 .code  = BPF_JMP | BPF_EXIT,                    \
 487                 .dst_reg = 0,                                   \
 488                 .src_reg = 0,                                   \
 489                 .off   = 0,                                     \
 490                 .imm   = 0 })
 491
 492 /* Speculation barrier */
 493
 494 #define BPF_ST_NOSPEC()                                         \
 495         ((struct bpf_insn) {                                    \
 496                 .code  = BPF_ST | BPF_NOSPEC,                   \
 497                 .dst_reg = 0,                                   \
 498                 .src_reg = 0,                                   \
 499                 .off   = 0,                                     \
 500                 .imm   = 0 })
 501
 502 /* Internal classic blocks for direct assignment */
 503
 504 #define __BPF_STMT(CODE, K)                                     \
 505         ((struct sock_filter) BPF_STMT(CODE, K))
 506
 507 #define __BPF_JUMP(CODE, K, JT, JF)                             \
 508         ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF))
 509
 510 #define bytes_to_bpf_size(bytes)                                \
 511 ({                                                              \
 512         int bpf_size = -EINVAL;                                 \
 513                                                                 \
 514         if (bytes == sizeof(u8))                                \
 515                 bpf_size = BPF_B;                               \
 516         else if (bytes == sizeof(u16))                          \
 517                 bpf_size = BPF_H;                               \
 518         else if (bytes == sizeof(u32))                          \
 519                 bpf_size = BPF_W;                               \
 520         else if (bytes == sizeof(u64))                          \
 521                 bpf_size = BPF_DW;                              \
 522                                                                 \
 523         bpf_size;                                               \
 524 })
 525
 526 #define bpf_size_to_bytes(bpf_size)                             \
 527 ({                                                              \
 528         int bytes = -EINVAL;                                    \
 529                                                                 \
 530         if (bpf_size == BPF_B)                                  \
 531                 bytes = sizeof(u8);                             \
 532         else if (bpf_size == BPF_H)                             \
 533                 bytes = sizeof(u16);                            \
 534         else if (bpf_size == BPF_W)                             \
 535                 bytes = sizeof(u32);                            \
 536         else if (bpf_size == BPF_DW)                            \
 537                 bytes = sizeof(u64);                            \
 538                                                                 \
 539         bytes;                                                  \
 540 })
 541
 542 #define BPF_SIZEOF(type)                                        \
 543         ({                                                      \
 544                 const int __size = bytes_to_bpf_size(sizeof(type)); \
 545                 BUILD_BUG_ON(__size < 0);                       \
 546                 __size;                                         \
 547         })
 548
 549 #define BPF_FIELD_SIZEOF(type, field)                           \
 550         ({                                                      \
 551                 const int __size = bytes_to_bpf_size(sizeof_field(type, field)); \
 552                 BUILD_BUG_ON(__size < 0);                       \
 553                 __size;                                         \
 554         })
 555
 556 #define BPF_LDST_BYTES(insn)                                    \
 557         ({                                                      \
 558                 const int __size = bpf_size_to_bytes(BPF_SIZE((insn)->code)); \
 559                 WARN_ON(__size < 0);                            \
 560                 __size;                                         \
 561         })
 562
 563 #define __BPF_MAP_0(m, v, ...) v
 564 #define __BPF_MAP_1(m, v, t, a, ...) m(t, a)
 565 #define __BPF_MAP_2(m, v, t, a, ...) m(t, a), __BPF_MAP_1(m, v, __VA_ARGS__)
 566 #define __BPF_MAP_3(m, v, t, a, ...) m(t, a), __BPF_MAP_2(m, v, __VA_ARGS__)
 567 #define __BPF_MAP_4(m, v, t, a, ...) m(t, a), __BPF_MAP_3(m, v, __VA_ARGS__)
 568 #define __BPF_MAP_5(m, v, t, a, ...) m(t, a), __BPF_MAP_4(m, v, __VA_ARGS__)
 569
 570 #define __BPF_REG_0(...) __BPF_PAD(5)
 571 #define __BPF_REG_1(...) __BPF_MAP(1, __VA_ARGS__), __BPF_PAD(4)
 572 #define __BPF_REG_2(...) __BPF_MAP(2, __VA_ARGS__), __BPF_PAD(3)
 573 #define __BPF_REG_3(...) __BPF_MAP(3, __VA_ARGS__), __BPF_PAD(2)
 574 #define __BPF_REG_4(...) __BPF_MAP(4, __VA_ARGS__), __BPF_PAD(1)
 575 #define __BPF_REG_5(...) __BPF_MAP(5, __VA_ARGS__)
 576
 577 #define __BPF_MAP(n, ...) __BPF_MAP_##n(__VA_ARGS__)
 578 #define __BPF_REG(n, ...) __BPF_REG_##n(__VA_ARGS__)
 579
 580 #define __BPF_CAST(t, a)                                                       \
 581         (__force t)                                                            \
 582         (__force                                                               \
 583          typeof(__builtin_choose_expr(sizeof(t) == sizeof(unsigned long),      \
 584                                       (unsigned long)0, (t)0))) a
 585 #define __BPF_V void
 586 #define __BPF_N
 587
 588 #define __BPF_DECL_ARGS(t, a) t   a
 589 #define __BPF_DECL_REGS(t, a) u64 a
 590
 591 #define __BPF_PAD(n)                                                           \
 592         __BPF_MAP(n, __BPF_DECL_ARGS, __BPF_N, u64, __ur_1, u64, __ur_2,       \
 593                   u64, __ur_3, u64, __ur_4, u64, __ur_5)
 594
 595 #define BPF_CALL_x(x, attr, name, ...)                                         \
 596         static __always_inline                                                 \
 597         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__));   \
 598         typedef u64 (*btf_##name)(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__)); \
 599         attr u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__));    \
 600         attr u64 name(__BPF_REG(x, __BPF_DECL_REGS, __BPF_N, __VA_ARGS__))     \
 601         {                                                                      \
 602                 return ((btf_##name)____##name)(__BPF_MAP(x,__BPF_CAST,__BPF_N,__VA_ARGS__));\
 603         }                                                                      \
 604         static __always_inline                                                 \
 605         u64 ____##name(__BPF_MAP(x, __BPF_DECL_ARGS, __BPF_V, __VA_ARGS__))
 606
 607 #define __NOATTR
 608 #define BPF_CALL_0(name, ...)   BPF_CALL_x(0, __NOATTR, name, __VA_ARGS__)
 609 #define BPF_CALL_1(name, ...)   BPF_CALL_x(1, __NOATTR, name, __VA_ARGS__)
 610 #define BPF_CALL_2(name, ...)   BPF_CALL_x(2, __NOATTR, name, __VA_ARGS__)
 611 #define BPF_CALL_3(name, ...)   BPF_CALL_x(3, __NOATTR, name, __VA_ARGS__)
 612 #define BPF_CALL_4(name, ...)   BPF_CALL_x(4, __NOATTR, name, __VA_ARGS__)
 613 #define BPF_CALL_5(name, ...)   BPF_CALL_x(5, __NOATTR, name, __VA_ARGS__)
 614
 615 #define NOTRACE_BPF_CALL_1(name, ...)   BPF_CALL_x(1, notrace, name, __VA_ARGS__)
 616
 617 #define bpf_ctx_range(TYPE, MEMBER)                                             \
 618         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 619 #define bpf_ctx_range_till(TYPE, MEMBER1, MEMBER2)                              \
 620         offsetof(TYPE, MEMBER1) ... offsetofend(TYPE, MEMBER2) - 1
 621 #if BITS_PER_LONG == 64
 622 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 623         offsetof(TYPE, MEMBER) ... offsetofend(TYPE, MEMBER) - 1
 624 #else
 625 # define bpf_ctx_range_ptr(TYPE, MEMBER)                                        \
 626         offsetof(TYPE, MEMBER) ... offsetof(TYPE, MEMBER) + 8 - 1
 627 #endif /* BITS_PER_LONG == 64 */
 628
 629 #define bpf_target_off(TYPE, MEMBER, SIZE, PTR_SIZE)                            \
 630         ({                                                                      \
 631                 BUILD_BUG_ON(sizeof_field(TYPE, MEMBER) != (SIZE));             \
 632                 *(PTR_SIZE) = (SIZE);                                           \
 633                 offsetof(TYPE, MEMBER);                                         \
 634         })
 635
 636 /* A struct sock_filter is architecture independent. */
 637 struct compat_sock_fprog {
 638         u16             len;
 639         compat_uptr_t   filter; /* struct sock_filter * */
 640 };
 641
 642 struct sock_fprog_kern {
 643         u16                     len;
 644         struct sock_filter      *filter;
 645 };
 646
 647 /* Some arches need doubleword alignment for their instructions and/or data */
 648 #define BPF_IMAGE_ALIGNMENT 8
 649
 650 struct bpf_binary_header {
 651         u32 size;
 652         u8 image[] __aligned(BPF_IMAGE_ALIGNMENT);
 653 };
 654
 655 struct bpf_prog_stats {
 656         u64_stats_t cnt;
 657         u64_stats_t nsecs;
 658         u64_stats_t misses;
 659         struct u64_stats_sync syncp;
 660 } __aligned(2 * sizeof(u64));
 661
 662 struct sk_filter {
 663         refcount_t      refcnt;
 664         struct rcu_head rcu;
 665         struct bpf_prog *prog;
 666 };
 667
 668 DECLARE_STATIC_KEY_FALSE(bpf_stats_enabled_key);
 669
 670 extern struct mutex nf_conn_btf_access_lock;
 671 extern int (*nfct_btf_struct_access)(struct bpf_verifier_log *log,
 672                                      const struct bpf_reg_state *reg,
 673                                      int off, int size);
 674
 675 typedef unsigned int (*bpf_dispatcher_fn)(const void *ctx,
 676                                           const struct bpf_insn *insnsi,
 677                                           unsigned int (*bpf_func)(const void *,
 678                                                                    const struct bpf_insn *));
 679
 680 static __always_inline u32 __bpf_prog_run(const struct bpf_prog *prog,
 681                                           const void *ctx,
 682                                           bpf_dispatcher_fn dfunc)
 683 {
 684         u32 ret;
 685
 686         cant_migrate();
 687         if (static_branch_unlikely(&bpf_stats_enabled_key)) {
 688                 struct bpf_prog_stats *stats;
 689                 u64 duration, start = sched_clock();
 690                 unsigned long flags;
 691
 692                 ret = dfunc(ctx, prog->insnsi, prog->bpf_func);
 693
 694                 duration = sched_clock() - start;
 695                 stats = this_cpu_ptr(prog->stats);
 696                 flags = u64_stats_update_begin_irqsave(&stats->syncp);
 697                 u64_stats_inc(&stats->cnt);
 698                 u64_stats_add(&stats->nsecs, duration);
 699                 u64_stats_update_end_irqrestore(&stats->syncp, flags);
 700         } else {
 701                 ret = dfunc(ctx, prog->insnsi, prog->bpf_func);
 702         }
 703         return ret;
 704 }
 705
 706 static __always_inline u32 bpf_prog_run(const struct bpf_prog *prog, const void *ctx)
 707 {
 708         return __bpf_prog_run(prog, ctx, bpf_dispatcher_nop_func);
 709 }
 710
 711 /*
 712  * Use in preemptible and therefore migratable context to make sure that
 713  * the execution of the BPF program runs on one CPU.
 714  *
 715  * This uses migrate_disable/enable() explicitly to document that the
 716  * invocation of a BPF program does not require reentrancy protection
 717  * against a BPF program which is invoked from a preempting task.
 718  */
 719 static inline u32 bpf_prog_run_pin_on_cpu(const struct bpf_prog *prog,
 720                                           const void *ctx)
 721 {
 722         u32 ret;
 723
 724         migrate_disable();
 725         ret = bpf_prog_run(prog, ctx);
 726         migrate_enable();
 727         return ret;
 728 }
 729
 730 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN
 731
 732 struct bpf_skb_data_end {
 733         struct qdisc_skb_cb qdisc_cb;
 734         void *data_meta;
 735         void *data_end;
 736 };
 737
 738 struct bpf_nh_params {
 739         u32 nh_family;
 740         union {
 741                 u32 ipv4_nh;
 742                 struct in6_addr ipv6_nh;
 743         };
 744 };
 745
 746 /* flags for bpf_redirect_info kern_flags */
 747 #define BPF_RI_F_RF_NO_DIRECT   BIT(0)  /* no napi_direct on return_frame */
 748 #define BPF_RI_F_RI_INIT        BIT(1)
 749 #define BPF_RI_F_CPU_MAP_INIT   BIT(2)
 750 #define BPF_RI_F_DEV_MAP_INIT   BIT(3)
 751 #define BPF_RI_F_XSK_MAP_INIT   BIT(4)
 752
 753 struct bpf_redirect_info {
 754         u64 tgt_index;
 755         void *tgt_value;
 756         struct bpf_map *map;
 757         u32 flags;
 758         u32 map_id;
 759         enum bpf_map_type map_type;
 760         struct bpf_nh_params nh;
 761         u32 kern_flags;
 762 };
 763
 764 struct bpf_net_context {
 765         struct bpf_redirect_info ri;
 766         struct list_head cpu_map_flush_list;
 767         struct list_head dev_map_flush_list;
 768         struct list_head xskmap_map_flush_list;
 769 };
 770
 771 static inline struct bpf_net_context *bpf_net_ctx_set(struct bpf_net_context *bpf_net_ctx)
 772 {
 773         struct task_struct *tsk = current;
 774
 775         if (tsk->bpf_net_context != NULL)
 776                 return NULL;
 777         bpf_net_ctx->ri.kern_flags = 0;
 778
 779         tsk->bpf_net_context = bpf_net_ctx;
 780         return bpf_net_ctx;
 781 }
 782
 783 static inline void bpf_net_ctx_clear(struct bpf_net_context *bpf_net_ctx)
 784 {
 785         if (bpf_net_ctx)
 786                 current->bpf_net_context = NULL;
 787 }
 788
 789 static inline struct bpf_net_context *bpf_net_ctx_get(void)
 790 {
 791         return current->bpf_net_context;
 792 }
 793
 794 static inline struct bpf_redirect_info *bpf_net_ctx_get_ri(void)
 795 {
 796         struct bpf_net_context *bpf_net_ctx = bpf_net_ctx_get();
 797
 798         if (!(bpf_net_ctx->ri.kern_flags & BPF_RI_F_RI_INIT)) {
 799                 memset(&bpf_net_ctx->ri, 0, offsetof(struct bpf_net_context, ri.nh));
 800                 bpf_net_ctx->ri.kern_flags |= BPF_RI_F_RI_INIT;
 801         }
 802
 803         return &bpf_net_ctx->ri;
 804 }
 805
 806 static inline struct list_head *bpf_net_ctx_get_cpu_map_flush_list(void)
 807 {
 808         struct bpf_net_context *bpf_net_ctx = bpf_net_ctx_get();
 809
 810         if (!(bpf_net_ctx->ri.kern_flags & BPF_RI_F_CPU_MAP_INIT)) {
 811                 INIT_LIST_HEAD(&bpf_net_ctx->cpu_map_flush_list);
 812                 bpf_net_ctx->ri.kern_flags |= BPF_RI_F_CPU_MAP_INIT;
 813         }
 814
 815         return &bpf_net_ctx->cpu_map_flush_list;
 816 }
 817
 818 static inline struct list_head *bpf_net_ctx_get_dev_flush_list(void)
 819 {
 820         struct bpf_net_context *bpf_net_ctx = bpf_net_ctx_get();
 821
 822         if (!(bpf_net_ctx->ri.kern_flags & BPF_RI_F_DEV_MAP_INIT)) {
 823                 INIT_LIST_HEAD(&bpf_net_ctx->dev_map_flush_list);
 824                 bpf_net_ctx->ri.kern_flags |= BPF_RI_F_DEV_MAP_INIT;
 825         }
 826
 827         return &bpf_net_ctx->dev_map_flush_list;
 828 }
 829
 830 static inline struct list_head *bpf_net_ctx_get_xskmap_flush_list(void)
 831 {
 832         struct bpf_net_context *bpf_net_ctx = bpf_net_ctx_get();
 833
 834         if (!(bpf_net_ctx->ri.kern_flags & BPF_RI_F_XSK_MAP_INIT)) {
 835                 INIT_LIST_HEAD(&bpf_net_ctx->xskmap_map_flush_list);
 836                 bpf_net_ctx->ri.kern_flags |= BPF_RI_F_XSK_MAP_INIT;
 837         }
 838
 839         return &bpf_net_ctx->xskmap_map_flush_list;
 840 }
 841
 842 static inline void bpf_net_ctx_get_all_used_flush_lists(struct list_head **lh_map,
 843                                                         struct list_head **lh_dev,
 844                                                         struct list_head **lh_xsk)
 845 {
 846         struct bpf_net_context *bpf_net_ctx = bpf_net_ctx_get();
 847         u32 kern_flags = bpf_net_ctx->ri.kern_flags;
 848         struct list_head *lh;
 849
 850         *lh_map = *lh_dev = *lh_xsk = NULL;
 851
 852         if (!IS_ENABLED(CONFIG_BPF_SYSCALL))
 853                 return;
 854
 855         lh = &bpf_net_ctx->dev_map_flush_list;
 856         if (kern_flags & BPF_RI_F_DEV_MAP_INIT && !list_empty(lh))
 857                 *lh_dev = lh;
 858
 859         lh = &bpf_net_ctx->cpu_map_flush_list;
 860         if (kern_flags & BPF_RI_F_CPU_MAP_INIT && !list_empty(lh))
 861                 *lh_map = lh;
 862
 863         lh = &bpf_net_ctx->xskmap_map_flush_list;
 864         if (IS_ENABLED(CONFIG_XDP_SOCKETS) &&
 865             kern_flags & BPF_RI_F_XSK_MAP_INIT && !list_empty(lh))
 866                 *lh_xsk = lh;
 867 }
 868
 869 /* Compute the linear packet data range [data, data_end) which
 870  * will be accessed by various program types (cls_bpf, act_bpf,
 871  * lwt, ...). Subsystems allowing direct data access must (!)
 872  * ensure that cb[] area can be written to when BPF program is
 873  * invoked (otherwise cb[] save/restore is necessary).
 874  */
 875 static inline void bpf_compute_data_pointers(struct sk_buff *skb)
 876 {
 877         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 878
 879         BUILD_BUG_ON(sizeof(*cb) > sizeof_field(struct sk_buff, cb));
 880         cb->data_meta = skb->data - skb_metadata_len(skb);
 881         cb->data_end  = skb->data + skb_headlen(skb);
 882 }
 883
 884 /* Similar to bpf_compute_data_pointers(), except that save orginal
 885  * data in cb->data and cb->meta_data for restore.
 886  */
 887 static inline void bpf_compute_and_save_data_end(
 888         struct sk_buff *skb, void **saved_data_end)
 889 {
 890         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 891
 892         *saved_data_end = cb->data_end;
 893         cb->data_end  = skb->data + skb_headlen(skb);
 894 }
 895
 896 /* Restore data saved by bpf_compute_and_save_data_end(). */
 897 static inline void bpf_restore_data_end(
 898         struct sk_buff *skb, void *saved_data_end)
 899 {
 900         struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb;
 901
 902         cb->data_end = saved_data_end;
 903 }
 904
 905 static inline u8 *bpf_skb_cb(const struct sk_buff *skb)
 906 {
 907         /* eBPF programs may read/write skb->cb[] area to transfer meta
 908          * data between tail calls. Since this also needs to work with
 909          * tc, that scratch memory is mapped to qdisc_skb_cb's data area.
 910          *
 911          * In some socket filter cases, the cb unfortunately needs to be
 912          * saved/restored so that protocol specific skb->cb[] data won't
 913          * be lost. In any case, due to unpriviledged eBPF programs
 914          * attached to sockets, we need to clear the bpf_skb_cb() area
 915          * to not leak previous contents to user space.
 916          */
 917         BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) != BPF_SKB_CB_LEN);
 918         BUILD_BUG_ON(sizeof_field(struct __sk_buff, cb) !=
 919                      sizeof_field(struct qdisc_skb_cb, data));
 920
 921         return qdisc_skb_cb(skb)->data;
 922 }
 923
 924 /* Must be invoked with migration disabled */
 925 static inline u32 __bpf_prog_run_save_cb(const struct bpf_prog *prog,
 926                                          const void *ctx)
 927 {
 928         const struct sk_buff *skb = ctx;
 929         u8 *cb_data = bpf_skb_cb(skb);
 930         u8 cb_saved[BPF_SKB_CB_LEN];
 931         u32 res;
 932
 933         if (unlikely(prog->cb_access)) {
 934                 memcpy(cb_saved, cb_data, sizeof(cb_saved));
 935                 memset(cb_data, 0, sizeof(cb_saved));
 936         }
 937
 938         res = bpf_prog_run(prog, skb);
 939
 940         if (unlikely(prog->cb_access))
 941                 memcpy(cb_data, cb_saved, sizeof(cb_saved));
 942
 943         return res;
 944 }
 945
 946 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog,
 947                                        struct sk_buff *skb)
 948 {
 949         u32 res;
 950
 951         migrate_disable();
 952         res = __bpf_prog_run_save_cb(prog, skb);
 953         migrate_enable();
 954         return res;
 955 }
 956
 957 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog,
 958                                         struct sk_buff *skb)
 959 {
 960         u8 *cb_data = bpf_skb_cb(skb);
 961         u32 res;
 962
 963         if (unlikely(prog->cb_access))
 964                 memset(cb_data, 0, BPF_SKB_CB_LEN);
 965
 966         res = bpf_prog_run_pin_on_cpu(prog, skb);
 967         return res;
 968 }
 969
 970 DECLARE_BPF_DISPATCHER(xdp)
 971
 972 DECLARE_STATIC_KEY_FALSE(bpf_master_redirect_enabled_key);
 973
 974 u32 xdp_master_redirect(struct xdp_buff *xdp);
 975
 976 void bpf_prog_change_xdp(struct bpf_prog *prev_prog, struct bpf_prog *prog);
 977
 978 static inline u32 bpf_prog_insn_size(const struct bpf_prog *prog)
 979 {
 980         return prog->len * sizeof(struct bpf_insn);
 981 }
 982
 983 static inline u32 bpf_prog_tag_scratch_size(const struct bpf_prog *prog)
 984 {
 985         return round_up(bpf_prog_insn_size(prog) +
 986                         sizeof(__be64) + 1, SHA1_BLOCK_SIZE);
 987 }
 988
 989 static inline unsigned int bpf_prog_size(unsigned int proglen)
 990 {
 991         return max(sizeof(struct bpf_prog),
 992                    offsetof(struct bpf_prog, insns[proglen]));
 993 }
 994
 995 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog)
 996 {
 997         /* When classic BPF programs have been loaded and the arch
 998          * does not have a classic BPF JIT (anymore), they have been
 999          * converted via bpf_migrate_filter() to eBPF and thus always
1000          * have an unspec program type.
1001          */
1002         return prog->type == BPF_PROG_TYPE_UNSPEC;
1003 }
1004
1005 static inline u32 bpf_ctx_off_adjust_machine(u32 size)
1006 {
1007         const u32 size_machine = sizeof(unsigned long);
1008
1009         if (size > size_machine && size % size_machine == 0)
1010                 size = size_machine;
1011
1012         return size;
1013 }
1014
1015 static inline bool
1016 bpf_ctx_narrow_access_ok(u32 off, u32 size, u32 size_default)
1017 {
1018         return size <= size_default && (size & (size - 1)) == 0;
1019 }
1020
1021 static inline u8
1022 bpf_ctx_narrow_access_offset(u32 off, u32 size, u32 size_default)
1023 {
1024         u8 access_off = off & (size_default - 1);
1025
1026 #ifdef __LITTLE_ENDIAN
1027         return access_off;
1028 #else
1029         return size_default - (access_off + size);
1030 #endif
1031 }
1032
1033 #define bpf_ctx_wide_access_ok(off, size, type, field)                  \
1034         (size == sizeof(__u64) &&                                       \
1035         off >= offsetof(type, field) &&                                 \
1036         off + sizeof(__u64) <= offsetofend(type, field) &&              \
1037         off % sizeof(__u64) == 0)
1038
1039 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0]))
1040
1041 static inline int __must_check bpf_prog_lock_ro(struct bpf_prog *fp)
1042 {
1043 #ifndef CONFIG_BPF_JIT_ALWAYS_ON
1044         if (!fp->jited) {
1045                 set_vm_flush_reset_perms(fp);
1046                 return set_memory_ro((unsigned long)fp, fp->pages);
1047         }
1048 #endif
1049         return 0;
1050 }
1051
1052 static inline int __must_check
1053 bpf_jit_binary_lock_ro(struct bpf_binary_header *hdr)
1054 {
1055         set_vm_flush_reset_perms(hdr);
1056         return set_memory_rox((unsigned long)hdr, hdr->size >> PAGE_SHIFT);
1057 }
1058
1059 int sk_filter_trim_cap(struct sock *sk, struct sk_buff *skb, unsigned int cap);
1060 static inline int sk_filter(struct sock *sk, struct sk_buff *skb)
1061 {
1062         return sk_filter_trim_cap(sk, skb, 1);
1063 }
1064
1065 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err);
1066 void bpf_prog_free(struct bpf_prog *fp);
1067
1068 bool bpf_opcode_in_insntable(u8 code);
1069
1070 void bpf_prog_fill_jited_linfo(struct bpf_prog *prog,
1071                                const u32 *insn_to_jit_off);
1072 int bpf_prog_alloc_jited_linfo(struct bpf_prog *prog);
1073 void bpf_prog_jit_attempt_done(struct bpf_prog *prog);
1074
1075 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags);
1076 struct bpf_prog *bpf_prog_alloc_no_stats(unsigned int size, gfp_t gfp_extra_flags);
1077 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size,
1078                                   gfp_t gfp_extra_flags);
1079 void __bpf_prog_free(struct bpf_prog *fp);
1080
1081 static inline void bpf_prog_unlock_free(struct bpf_prog *fp)
1082 {
1083         __bpf_prog_free(fp);
1084 }
1085
1086 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter,
1087                                        unsigned int flen);
1088
1089 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog);
1090 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog,
1091                               bpf_aux_classic_check_t trans, bool save_orig);
1092 void bpf_prog_destroy(struct bpf_prog *fp);
1093
1094 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk);
1095 int sk_attach_bpf(u32 ufd, struct sock *sk);
1096 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
1097 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
1098 void sk_reuseport_prog_free(struct bpf_prog *prog);
1099 int sk_detach_filter(struct sock *sk);
1100 int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len);
1101
1102 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
1103 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
1104
1105 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
1106 #define __bpf_call_base_args \
1107         ((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
1108          (void *)__bpf_call_base)
1109
1110 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
1111 void bpf_jit_compile(struct bpf_prog *prog);
1112 bool bpf_jit_needs_zext(void);
1113 bool bpf_jit_inlines_helper_call(s32 imm);
1114 bool bpf_jit_supports_subprog_tailcalls(void);
1115 bool bpf_jit_supports_percpu_insn(void);
1116 bool bpf_jit_supports_kfunc_call(void);
1117 bool bpf_jit_supports_far_kfunc_call(void);
1118 bool bpf_jit_supports_exceptions(void);
1119 bool bpf_jit_supports_ptr_xchg(void);
1120 bool bpf_jit_supports_arena(void);
1121 bool bpf_jit_supports_insn(struct bpf_insn *insn, bool in_arena);
1122 u64 bpf_arch_uaddress_limit(void);
1123 void arch_bpf_stack_walk(bool (*consume_fn)(void *cookie, u64 ip, u64 sp, u64 bp), void *cookie);
1124 bool bpf_helper_changes_pkt_data(void *func);
1125
1126 static inline bool bpf_dump_raw_ok(const struct cred *cred)
1127 {
1128         /* Reconstruction of call-sites is dependent on kallsyms,
1129          * thus make dump the same restriction.
1130          */
1131         return kallsyms_show_value(cred);
1132 }
1133
1134 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off,
1135                                        const struct bpf_insn *patch, u32 len);
1136 int bpf_remove_insns(struct bpf_prog *prog, u32 off, u32 cnt);
1137
1138 static inline bool xdp_return_frame_no_direct(void)
1139 {
1140         struct bpf_redirect_info *ri = bpf_net_ctx_get_ri();
1141
1142         return ri->kern_flags & BPF_RI_F_RF_NO_DIRECT;
1143 }
1144
1145 static inline void xdp_set_return_frame_no_direct(void)
1146 {
1147         struct bpf_redirect_info *ri = bpf_net_ctx_get_ri();
1148
1149         ri->kern_flags |= BPF_RI_F_RF_NO_DIRECT;
1150 }
1151
1152 static inline void xdp_clear_return_frame_no_direct(void)
1153 {
1154         struct bpf_redirect_info *ri = bpf_net_ctx_get_ri();
1155
1156         ri->kern_flags &= ~BPF_RI_F_RF_NO_DIRECT;
1157 }
1158
1159 static inline int xdp_ok_fwd_dev(const struct net_device *fwd,
1160                                  unsigned int pktlen)
1161 {
1162         unsigned int len;
1163
1164         if (unlikely(!(fwd->flags & IFF_UP)))
1165                 return -ENETDOWN;
1166
1167         len = fwd->mtu + fwd->hard_header_len + VLAN_HLEN;
1168         if (pktlen > len)
1169                 return -EMSGSIZE;
1170
1171         return 0;
1172 }
1173
1174 /* The pair of xdp_do_redirect and xdp_do_flush MUST be called in the
1175  * same cpu context. Further for best results no more than a single map
1176  * for the do_redirect/do_flush pair should be used. This limitation is
1177  * because we only track one map and force a flush when the map changes.
1178  * This does not appear to be a real limitation for existing software.
1179  */
1180 int xdp_do_generic_redirect(struct net_device *dev, struct sk_buff *skb,
1181                             struct xdp_buff *xdp, struct bpf_prog *prog);
1182 int xdp_do_redirect(struct net_device *dev,
1183                     struct xdp_buff *xdp,
1184                     struct bpf_prog *prog);
1185 int xdp_do_redirect_frame(struct net_device *dev,
1186                           struct xdp_buff *xdp,
1187                           struct xdp_frame *xdpf,
1188                           struct bpf_prog *prog);
1189 void xdp_do_flush(void);
1190
1191 void bpf_warn_invalid_xdp_action(struct net_device *dev, struct bpf_prog *prog, u32 act);
1192
1193 #ifdef CONFIG_INET
1194 struct sock *bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
1195                                   struct bpf_prog *prog, struct sk_buff *skb,
1196                                   struct sock *migrating_sk,
1197                                   u32 hash);
1198 #else
1199 static inline struct sock *
1200 bpf_run_sk_reuseport(struct sock_reuseport *reuse, struct sock *sk,
1201                      struct bpf_prog *prog, struct sk_buff *skb,
1202                      struct sock *migrating_sk,
1203                      u32 hash)
1204 {
1205         return NULL;
1206 }
1207 #endif
1208
1209 #ifdef CONFIG_BPF_JIT
1210 extern int bpf_jit_enable;
1211 extern int bpf_jit_harden;
1212 extern int bpf_jit_kallsyms;
1213 extern long bpf_jit_limit;
1214 extern long bpf_jit_limit_max;
1215
1216 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size);
1217
1218 void bpf_jit_fill_hole_with_zero(void *area, unsigned int size);
1219
1220 struct bpf_binary_header *
1221 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
1222                      unsigned int alignment,
1223                      bpf_jit_fill_hole_t bpf_fill_ill_insns);
1224 void bpf_jit_binary_free(struct bpf_binary_header *hdr);
1225 u64 bpf_jit_alloc_exec_limit(void);
1226 void *bpf_jit_alloc_exec(unsigned long size);
1227 void bpf_jit_free_exec(void *addr);
1228 void bpf_jit_free(struct bpf_prog *fp);
1229 struct bpf_binary_header *
1230 bpf_jit_binary_pack_hdr(const struct bpf_prog *fp);
1231
1232 void *bpf_prog_pack_alloc(u32 size, bpf_jit_fill_hole_t bpf_fill_ill_insns);
1233 void bpf_prog_pack_free(void *ptr, u32 size);
1234
1235 static inline bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp)
1236 {
1237         return list_empty(&fp->aux->ksym.lnode) ||
1238                fp->aux->ksym.lnode.prev == LIST_POISON2;
1239 }
1240
1241 struct bpf_binary_header *
1242 bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **ro_image,
1243                           unsigned int alignment,
1244                           struct bpf_binary_header **rw_hdr,
1245                           u8 **rw_image,
1246                           bpf_jit_fill_hole_t bpf_fill_ill_insns);
1247 int bpf_jit_binary_pack_finalize(struct bpf_binary_header *ro_header,
1248                                  struct bpf_binary_header *rw_header);
1249 void bpf_jit_binary_pack_free(struct bpf_binary_header *ro_header,
1250                               struct bpf_binary_header *rw_header);
1251
1252 int bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1253                                 struct bpf_jit_poke_descriptor *poke);
1254
1255 int bpf_jit_get_func_addr(const struct bpf_prog *prog,
1256                           const struct bpf_insn *insn, bool extra_pass,
1257                           u64 *func_addr, bool *func_addr_fixed);
1258
1259 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp);
1260 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other);
1261
1262 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen,
1263                                 u32 pass, void *image)
1264 {
1265         pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen,
1266                proglen, pass, image, current->comm, task_pid_nr(current));
1267
1268         if (image)
1269                 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET,
1270                                16, 1, image, proglen, false);
1271 }
1272
1273 static inline bool bpf_jit_is_ebpf(void)
1274 {
1275 # ifdef CONFIG_HAVE_EBPF_JIT
1276         return true;
1277 # else
1278         return false;
1279 # endif
1280 }
1281
1282 static inline bool ebpf_jit_enabled(void)
1283 {
1284         return bpf_jit_enable && bpf_jit_is_ebpf();
1285 }
1286
1287 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1288 {
1289         return fp->jited && bpf_jit_is_ebpf();
1290 }
1291
1292 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1293 {
1294         /* These are the prerequisites, should someone ever have the
1295          * idea to call blinding outside of them, we make sure to
1296          * bail out.
1297          */
1298         if (!bpf_jit_is_ebpf())
1299                 return false;
1300         if (!prog->jit_requested)
1301                 return false;
1302         if (!bpf_jit_harden)
1303                 return false;
1304         if (bpf_jit_harden == 1 && bpf_token_capable(prog->aux->token, CAP_BPF))
1305                 return false;
1306
1307         return true;
1308 }
1309
1310 static inline bool bpf_jit_kallsyms_enabled(void)
1311 {
1312         /* There are a couple of corner cases where kallsyms should
1313          * not be enabled f.e. on hardening.
1314          */
1315         if (bpf_jit_harden)
1316                 return false;
1317         if (!bpf_jit_kallsyms)
1318                 return false;
1319         if (bpf_jit_kallsyms == 1)
1320                 return true;
1321
1322         return false;
1323 }
1324
1325 int __bpf_address_lookup(unsigned long addr, unsigned long *size,
1326                                  unsigned long *off, char *sym);
1327 bool is_bpf_text_address(unsigned long addr);
1328 int bpf_get_kallsym(unsigned int symnum, unsigned long *value, char *type,
1329                     char *sym);
1330 struct bpf_prog *bpf_prog_ksym_find(unsigned long addr);
1331
1332 static inline int
1333 bpf_address_lookup(unsigned long addr, unsigned long *size,
1334                    unsigned long *off, char **modname, char *sym)
1335 {
1336         int ret = __bpf_address_lookup(addr, size, off, sym);
1337
1338         if (ret && modname)
1339                 *modname = NULL;
1340         return ret;
1341 }
1342
1343 void bpf_prog_kallsyms_add(struct bpf_prog *fp);
1344 void bpf_prog_kallsyms_del(struct bpf_prog *fp);
1345
1346 #else /* CONFIG_BPF_JIT */
1347
1348 static inline bool ebpf_jit_enabled(void)
1349 {
1350         return false;
1351 }
1352
1353 static inline bool bpf_jit_blinding_enabled(struct bpf_prog *prog)
1354 {
1355         return false;
1356 }
1357
1358 static inline bool bpf_prog_ebpf_jited(const struct bpf_prog *fp)
1359 {
1360         return false;
1361 }
1362
1363 static inline int
1364 bpf_jit_add_poke_descriptor(struct bpf_prog *prog,
1365                             struct bpf_jit_poke_descriptor *poke)
1366 {
1367         return -ENOTSUPP;
1368 }
1369
1370 static inline void bpf_jit_free(struct bpf_prog *fp)
1371 {
1372         bpf_prog_unlock_free(fp);
1373 }
1374
1375 static inline bool bpf_jit_kallsyms_enabled(void)
1376 {
1377         return false;
1378 }
1379
1380 static inline int
1381 __bpf_address_lookup(unsigned long addr, unsigned long *size,
1382                      unsigned long *off, char *sym)
1383 {
1384         return 0;
1385 }
1386
1387 static inline bool is_bpf_text_address(unsigned long addr)
1388 {
1389         return false;
1390 }
1391
1392 static inline int bpf_get_kallsym(unsigned int symnum, unsigned long *value,
1393                                   char *type, char *sym)
1394 {
1395         return -ERANGE;
1396 }
1397
1398 static inline struct bpf_prog *bpf_prog_ksym_find(unsigned long addr)
1399 {
1400         return NULL;
1401 }
1402
1403 static inline int
1404 bpf_address_lookup(unsigned long addr, unsigned long *size,
1405                    unsigned long *off, char **modname, char *sym)
1406 {
1407         return 0;
1408 }
1409
1410 static inline void bpf_prog_kallsyms_add(struct bpf_prog *fp)
1411 {
1412 }
1413
1414 static inline void bpf_prog_kallsyms_del(struct bpf_prog *fp)
1415 {
1416 }
1417
1418 #endif /* CONFIG_BPF_JIT */
1419
1420 void bpf_prog_kallsyms_del_all(struct bpf_prog *fp);
1421
1422 #define BPF_ANC         BIT(15)
1423
1424 static inline bool bpf_needs_clear_a(const struct sock_filter *first)
1425 {
1426         switch (first->code) {
1427         case BPF_RET | BPF_K:
1428         case BPF_LD | BPF_W | BPF_LEN:
1429                 return false;
1430
1431         case BPF_LD | BPF_W | BPF_ABS:
1432         case BPF_LD | BPF_H | BPF_ABS:
1433         case BPF_LD | BPF_B | BPF_ABS:
1434                 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X)
1435                         return true;
1436                 return false;
1437
1438         default:
1439                 return true;
1440         }
1441 }
1442
1443 static inline u16 bpf_anc_helper(const struct sock_filter *ftest)
1444 {
1445         BUG_ON(ftest->code & BPF_ANC);
1446
1447         switch (ftest->code) {
1448         case BPF_LD | BPF_W | BPF_ABS:
1449         case BPF_LD | BPF_H | BPF_ABS:
1450         case BPF_LD | BPF_B | BPF_ABS:
1451 #define BPF_ANCILLARY(CODE)     case SKF_AD_OFF + SKF_AD_##CODE:        \
1452                                 return BPF_ANC | SKF_AD_##CODE
1453                 switch (ftest->k) {
1454                 BPF_ANCILLARY(PROTOCOL);
1455                 BPF_ANCILLARY(PKTTYPE);
1456                 BPF_ANCILLARY(IFINDEX);
1457                 BPF_ANCILLARY(NLATTR);
1458                 BPF_ANCILLARY(NLATTR_NEST);
1459                 BPF_ANCILLARY(MARK);
1460                 BPF_ANCILLARY(QUEUE);
1461                 BPF_ANCILLARY(HATYPE);
1462                 BPF_ANCILLARY(RXHASH);
1463                 BPF_ANCILLARY(CPU);
1464                 BPF_ANCILLARY(ALU_XOR_X);
1465                 BPF_ANCILLARY(VLAN_TAG);
1466                 BPF_ANCILLARY(VLAN_TAG_PRESENT);
1467                 BPF_ANCILLARY(PAY_OFFSET);
1468                 BPF_ANCILLARY(RANDOM);
1469                 BPF_ANCILLARY(VLAN_TPID);
1470                 }
1471                 fallthrough;
1472         default:
1473                 return ftest->code;
1474         }
1475 }
1476
1477 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb,
1478                                            int k, unsigned int size);
1479
1480 static inline int bpf_tell_extensions(void)
1481 {
1482         return SKF_AD_MAX;
1483 }
1484
1485 struct bpf_sock_addr_kern {
1486         struct sock *sk;
1487         struct sockaddr *uaddr;
1488         /* Temporary "register" to make indirect stores to nested structures
1489          * defined above. We need three registers to make such a store, but
1490          * only two (src and dst) are available at convert_ctx_access time
1491          */
1492         u64 tmp_reg;
1493         void *t_ctx;    /* Attach type specific context. */
1494         u32 uaddrlen;
1495 };
1496
1497 struct bpf_sock_ops_kern {
1498         struct  sock *sk;
1499         union {
1500                 u32 args[4];
1501                 u32 reply;
1502                 u32 replylong[4];
1503         };
1504         struct sk_buff  *syn_skb;
1505         struct sk_buff  *skb;
1506         void    *skb_data_end;
1507         u8      op;
1508         u8      is_fullsock;
1509         u8      remaining_opt_len;
1510         u64     temp;                   /* temp and everything after is not
1511                                          * initialized to 0 before calling
1512                                          * the BPF program. New fields that
1513                                          * should be initialized to 0 should
1514                                          * be inserted before temp.
1515                                          * temp is scratch storage used by
1516                                          * sock_ops_convert_ctx_access
1517                                          * as temporary storage of a register.
1518                                          */
1519 };
1520
1521 struct bpf_sysctl_kern {
1522         struct ctl_table_header *head;
1523         const struct ctl_table *table;
1524         void *cur_val;
1525         size_t cur_len;
1526         void *new_val;
1527         size_t new_len;
1528         int new_updated;
1529         int write;
1530         loff_t *ppos;
1531         /* Temporary "register" for indirect stores to ppos. */
1532         u64 tmp_reg;
1533 };
1534
1535 #define BPF_SOCKOPT_KERN_BUF_SIZE       32
1536 struct bpf_sockopt_buf {
1537         u8              data[BPF_SOCKOPT_KERN_BUF_SIZE];
1538 };
1539
1540 struct bpf_sockopt_kern {
1541         struct sock     *sk;
1542         u8              *optval;
1543         u8              *optval_end;
1544         s32             level;
1545         s32             optname;
1546         s32             optlen;
1547         /* for retval in struct bpf_cg_run_ctx */
1548         struct task_struct *current_task;
1549         /* Temporary "register" for indirect stores to ppos. */
1550         u64             tmp_reg;
1551 };
1552
1553 int copy_bpf_fprog_from_user(struct sock_fprog *dst, sockptr_t src, int len);
1554
1555 struct bpf_sk_lookup_kern {
1556         u16             family;
1557         u16             protocol;
1558         __be16          sport;
1559         u16             dport;
1560         struct {
1561                 __be32 saddr;
1562                 __be32 daddr;
1563         } v4;
1564         struct {
1565                 const struct in6_addr *saddr;
1566                 const struct in6_addr *daddr;
1567         } v6;
1568         struct sock     *selected_sk;
1569         u32             ingress_ifindex;
1570         bool            no_reuseport;
1571 };
1572
1573 extern struct static_key_false bpf_sk_lookup_enabled;
1574
1575 /* Runners for BPF_SK_LOOKUP programs to invoke on socket lookup.
1576  *
1577  * Allowed return values for a BPF SK_LOOKUP program are SK_PASS and
1578  * SK_DROP. Their meaning is as follows:
1579  *
1580  *  SK_PASS && ctx.selected_sk != NULL: use selected_sk as lookup result
1581  *  SK_PASS && ctx.selected_sk == NULL: continue to htable-based socket lookup
1582  *  SK_DROP                           : terminate lookup with -ECONNREFUSED
1583  *
1584  * This macro aggregates return values and selected sockets from
1585  * multiple BPF programs according to following rules in order:
1586  *
1587  *  1. If any program returned SK_PASS and a non-NULL ctx.selected_sk,
1588  *     macro result is SK_PASS and last ctx.selected_sk is used.
1589  *  2. If any program returned SK_DROP return value,
1590  *     macro result is SK_DROP.
1591  *  3. Otherwise result is SK_PASS and ctx.selected_sk is NULL.
1592  *
1593  * Caller must ensure that the prog array is non-NULL, and that the
1594  * array as well as the programs it contains remain valid.
1595  */
1596 #define BPF_PROG_SK_LOOKUP_RUN_ARRAY(array, ctx, func)                  \
1597         ({                                                              \
1598                 struct bpf_sk_lookup_kern *_ctx = &(ctx);               \
1599                 struct bpf_prog_array_item *_item;                      \
1600                 struct sock *_selected_sk = NULL;                       \
1601                 bool _no_reuseport = false;                             \
1602                 struct bpf_prog *_prog;                                 \
1603                 bool _all_pass = true;                                  \
1604                 u32 _ret;                                               \
1605                                                                         \
1606                 migrate_disable();                                      \
1607                 _item = &(array)->items[0];                             \
1608                 while ((_prog = READ_ONCE(_item->prog))) {              \
1609                         /* restore most recent selection */             \
1610                         _ctx->selected_sk = _selected_sk;               \
1611                         _ctx->no_reuseport = _no_reuseport;             \
1612                                                                         \
1613                         _ret = func(_prog, _ctx);                       \
1614                         if (_ret == SK_PASS && _ctx->selected_sk) {     \
1615                                 /* remember last non-NULL socket */     \
1616                                 _selected_sk = _ctx->selected_sk;       \
1617                                 _no_reuseport = _ctx->no_reuseport;     \
1618                         } else if (_ret == SK_DROP && _all_pass) {      \
1619                                 _all_pass = false;                      \
1620                         }                                               \
1621                         _item++;                                        \
1622                 }                                                       \
1623                 _ctx->selected_sk = _selected_sk;                       \
1624                 _ctx->no_reuseport = _no_reuseport;                     \
1625                 migrate_enable();                                       \
1626                 _all_pass || _selected_sk ? SK_PASS : SK_DROP;          \
1627          })
1628
1629 static inline bool bpf_sk_lookup_run_v4(const struct net *net, int protocol,
1630                                         const __be32 saddr, const __be16 sport,
1631                                         const __be32 daddr, const u16 dport,
1632                                         const int ifindex, struct sock **psk)
1633 {
1634         struct bpf_prog_array *run_array;
1635         struct sock *selected_sk = NULL;
1636         bool no_reuseport = false;
1637
1638         rcu_read_lock();
1639         run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
1640         if (run_array) {
1641                 struct bpf_sk_lookup_kern ctx = {
1642                         .family         = AF_INET,
1643                         .protocol       = protocol,
1644                         .v4.saddr       = saddr,
1645                         .v4.daddr       = daddr,
1646                         .sport          = sport,
1647                         .dport          = dport,
1648                         .ingress_ifindex        = ifindex,
1649                 };
1650                 u32 act;
1651
1652                 act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run);
1653                 if (act == SK_PASS) {
1654                         selected_sk = ctx.selected_sk;
1655                         no_reuseport = ctx.no_reuseport;
1656                 } else {
1657                         selected_sk = ERR_PTR(-ECONNREFUSED);
1658                 }
1659         }
1660         rcu_read_unlock();
1661         *psk = selected_sk;
1662         return no_reuseport;
1663 }
1664
1665 #if IS_ENABLED(CONFIG_IPV6)
1666 static inline bool bpf_sk_lookup_run_v6(const struct net *net, int protocol,
1667                                         const struct in6_addr *saddr,
1668                                         const __be16 sport,
1669                                         const struct in6_addr *daddr,
1670                                         const u16 dport,
1671                                         const int ifindex, struct sock **psk)
1672 {
1673         struct bpf_prog_array *run_array;
1674         struct sock *selected_sk = NULL;
1675         bool no_reuseport = false;
1676
1677         rcu_read_lock();
1678         run_array = rcu_dereference(net->bpf.run_array[NETNS_BPF_SK_LOOKUP]);
1679         if (run_array) {
1680                 struct bpf_sk_lookup_kern ctx = {
1681                         .family         = AF_INET6,
1682                         .protocol       = protocol,
1683                         .v6.saddr       = saddr,
1684                         .v6.daddr       = daddr,
1685                         .sport          = sport,
1686                         .dport          = dport,
1687                         .ingress_ifindex        = ifindex,
1688                 };
1689                 u32 act;
1690
1691                 act = BPF_PROG_SK_LOOKUP_RUN_ARRAY(run_array, ctx, bpf_prog_run);
1692                 if (act == SK_PASS) {
1693                         selected_sk = ctx.selected_sk;
1694                         no_reuseport = ctx.no_reuseport;
1695                 } else {
1696                         selected_sk = ERR_PTR(-ECONNREFUSED);
1697                 }
1698         }
1699         rcu_read_unlock();
1700         *psk = selected_sk;
1701         return no_reuseport;
1702 }
1703 #endif /* IS_ENABLED(CONFIG_IPV6) */
1704
1705 static __always_inline long __bpf_xdp_redirect_map(struct bpf_map *map, u64 index,
1706                                                    u64 flags, const u64 flag_mask,
1707                                                    void *lookup_elem(struct bpf_map *map, u32 key))
1708 {
1709         struct bpf_redirect_info *ri = bpf_net_ctx_get_ri();
1710         const u64 action_mask = XDP_ABORTED | XDP_DROP | XDP_PASS | XDP_TX;
1711
1712         /* Lower bits of the flags are used as return code on lookup failure */
1713         if (unlikely(flags & ~(action_mask | flag_mask)))
1714                 return XDP_ABORTED;
1715
1716         ri->tgt_value = lookup_elem(map, index);
1717         if (unlikely(!ri->tgt_value) && !(flags & BPF_F_BROADCAST)) {
1718                 /* If the lookup fails we want to clear out the state in the
1719                  * redirect_info struct completely, so that if an eBPF program
1720                  * performs multiple lookups, the last one always takes
1721                  * precedence.
1722                  */
1723                 ri->map_id = INT_MAX; /* Valid map id idr range: [1,INT_MAX[ */
1724                 ri->map_type = BPF_MAP_TYPE_UNSPEC;
1725                 return flags & action_mask;
1726         }
1727
1728         ri->tgt_index = index;
1729         ri->map_id = map->id;
1730         ri->map_type = map->map_type;
1731
1732         if (flags & BPF_F_BROADCAST) {
1733                 WRITE_ONCE(ri->map, map);
1734                 ri->flags = flags;
1735         } else {
1736                 WRITE_ONCE(ri->map, NULL);
1737                 ri->flags = 0;
1738         }
1739
1740         return XDP_REDIRECT;
1741 }
1742
1743 #ifdef CONFIG_NET
1744 int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset, void *to, u32 len);
1745 int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset, const void *from,
1746                           u32 len, u64 flags);
1747 int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len);
1748 int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset, void *buf, u32 len);
1749 void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len);
1750 void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off,
1751                       void *buf, unsigned long len, bool flush);
1752 #else /* CONFIG_NET */
1753 static inline int __bpf_skb_load_bytes(const struct sk_buff *skb, u32 offset,
1754                                        void *to, u32 len)
1755 {
1756         return -EOPNOTSUPP;
1757 }
1758
1759 static inline int __bpf_skb_store_bytes(struct sk_buff *skb, u32 offset,
1760                                         const void *from, u32 len, u64 flags)
1761 {
1762         return -EOPNOTSUPP;
1763 }
1764
1765 static inline int __bpf_xdp_load_bytes(struct xdp_buff *xdp, u32 offset,
1766                                        void *buf, u32 len)
1767 {
1768         return -EOPNOTSUPP;
1769 }
1770
1771 static inline int __bpf_xdp_store_bytes(struct xdp_buff *xdp, u32 offset,
1772                                         void *buf, u32 len)
1773 {
1774         return -EOPNOTSUPP;
1775 }
1776
1777 static inline void *bpf_xdp_pointer(struct xdp_buff *xdp, u32 offset, u32 len)
1778 {
1779         return NULL;
1780 }
1781
1782 static inline void bpf_xdp_copy_buf(struct xdp_buff *xdp, unsigned long off, void *buf,
1783                                     unsigned long len, bool flush)
1784 {
1785 }
1786 #endif /* CONFIG_NET */
1787
1788 #endif /* __LINUX_FILTER_H__ */