1 /* 2 * Linux Socket Filter Data Structures 3 */ 4 #ifndef __LINUX_FILTER_H__ 5 #define __LINUX_FILTER_H__ 6 7 #include <stdarg.h> 8 9 #include <linux/atomic.h> 10 #include <linux/compat.h> 11 #include <linux/skbuff.h> 12 #include <linux/linkage.h> 13 #include <linux/printk.h> 14 #include <linux/workqueue.h> 15 #include <linux/sched.h> 16 #include <linux/capability.h> 17 18 #include <net/sch_generic.h> 19 20 #include <asm/cacheflush.h> 21 22 #include <uapi/linux/filter.h> 23 #include <uapi/linux/bpf.h> 24 25 struct sk_buff; 26 struct sock; 27 struct seccomp_data; 28 struct bpf_prog_aux; 29 30 /* ArgX, context and stack frame pointer register positions. Note, 31 * Arg1, Arg2, Arg3, etc are used as argument mappings of function 32 * calls in BPF_CALL instruction. 33 */ 34 #define BPF_REG_ARG1 BPF_REG_1 35 #define BPF_REG_ARG2 BPF_REG_2 36 #define BPF_REG_ARG3 BPF_REG_3 37 #define BPF_REG_ARG4 BPF_REG_4 38 #define BPF_REG_ARG5 BPF_REG_5 39 #define BPF_REG_CTX BPF_REG_6 40 #define BPF_REG_FP BPF_REG_10 41 42 /* Additional register mappings for converted user programs. */ 43 #define BPF_REG_A BPF_REG_0 44 #define BPF_REG_X BPF_REG_7 45 #define BPF_REG_TMP BPF_REG_8 46 47 /* Kernel hidden auxiliary/helper register for hardening step. 48 * Only used by eBPF JITs. It's nothing more than a temporary 49 * register that JITs use internally, only that here it's part 50 * of eBPF instructions that have been rewritten for blinding 51 * constants. See JIT pre-step in bpf_jit_blind_constants(). 52 */ 53 #define BPF_REG_AX MAX_BPF_REG 54 #define MAX_BPF_JIT_REG (MAX_BPF_REG + 1) 55 56 /* BPF program can access up to 512 bytes of stack space. */ 57 #define MAX_BPF_STACK 512 58 59 /* Helper macros for filter block array initializers. */ 60 61 /* ALU ops on registers, bpf_add|sub|...: dst_reg += src_reg */ 62 63 #define BPF_ALU64_REG(OP, DST, SRC) \ 64 ((struct bpf_insn) { \ 65 .code = BPF_ALU64 | BPF_OP(OP) | BPF_X, \ 66 .dst_reg = DST, \ 67 .src_reg = SRC, \ 68 .off = 0, \ 69 .imm = 0 }) 70 71 #define BPF_ALU32_REG(OP, DST, SRC) \ 72 ((struct bpf_insn) { \ 73 .code = BPF_ALU | BPF_OP(OP) | BPF_X, \ 74 .dst_reg = DST, \ 75 .src_reg = SRC, \ 76 .off = 0, \ 77 .imm = 0 }) 78 79 /* ALU ops on immediates, bpf_add|sub|...: dst_reg += imm32 */ 80 81 #define BPF_ALU64_IMM(OP, DST, IMM) \ 82 ((struct bpf_insn) { \ 83 .code = BPF_ALU64 | BPF_OP(OP) | BPF_K, \ 84 .dst_reg = DST, \ 85 .src_reg = 0, \ 86 .off = 0, \ 87 .imm = IMM }) 88 89 #define BPF_ALU32_IMM(OP, DST, IMM) \ 90 ((struct bpf_insn) { \ 91 .code = BPF_ALU | BPF_OP(OP) | BPF_K, \ 92 .dst_reg = DST, \ 93 .src_reg = 0, \ 94 .off = 0, \ 95 .imm = IMM }) 96 97 /* Endianess conversion, cpu_to_{l,b}e(), {l,b}e_to_cpu() */ 98 99 #define BPF_ENDIAN(TYPE, DST, LEN) \ 100 ((struct bpf_insn) { \ 101 .code = BPF_ALU | BPF_END | BPF_SRC(TYPE), \ 102 .dst_reg = DST, \ 103 .src_reg = 0, \ 104 .off = 0, \ 105 .imm = LEN }) 106 107 /* Short form of mov, dst_reg = src_reg */ 108 109 #define BPF_MOV64_REG(DST, SRC) \ 110 ((struct bpf_insn) { \ 111 .code = BPF_ALU64 | BPF_MOV | BPF_X, \ 112 .dst_reg = DST, \ 113 .src_reg = SRC, \ 114 .off = 0, \ 115 .imm = 0 }) 116 117 #define BPF_MOV32_REG(DST, SRC) \ 118 ((struct bpf_insn) { \ 119 .code = BPF_ALU | BPF_MOV | BPF_X, \ 120 .dst_reg = DST, \ 121 .src_reg = SRC, \ 122 .off = 0, \ 123 .imm = 0 }) 124 125 /* Short form of mov, dst_reg = imm32 */ 126 127 #define BPF_MOV64_IMM(DST, IMM) \ 128 ((struct bpf_insn) { \ 129 .code = BPF_ALU64 | BPF_MOV | BPF_K, \ 130 .dst_reg = DST, \ 131 .src_reg = 0, \ 132 .off = 0, \ 133 .imm = IMM }) 134 135 #define BPF_MOV32_IMM(DST, IMM) \ 136 ((struct bpf_insn) { \ 137 .code = BPF_ALU | BPF_MOV | BPF_K, \ 138 .dst_reg = DST, \ 139 .src_reg = 0, \ 140 .off = 0, \ 141 .imm = IMM }) 142 143 /* BPF_LD_IMM64 macro encodes single 'load 64-bit immediate' insn */ 144 #define BPF_LD_IMM64(DST, IMM) \ 145 BPF_LD_IMM64_RAW(DST, 0, IMM) 146 147 #define BPF_LD_IMM64_RAW(DST, SRC, IMM) \ 148 ((struct bpf_insn) { \ 149 .code = BPF_LD | BPF_DW | BPF_IMM, \ 150 .dst_reg = DST, \ 151 .src_reg = SRC, \ 152 .off = 0, \ 153 .imm = (__u32) (IMM) }), \ 154 ((struct bpf_insn) { \ 155 .code = 0, /* zero is reserved opcode */ \ 156 .dst_reg = 0, \ 157 .src_reg = 0, \ 158 .off = 0, \ 159 .imm = ((__u64) (IMM)) >> 32 }) 160 161 /* pseudo BPF_LD_IMM64 insn used to refer to process-local map_fd */ 162 #define BPF_LD_MAP_FD(DST, MAP_FD) \ 163 BPF_LD_IMM64_RAW(DST, BPF_PSEUDO_MAP_FD, MAP_FD) 164 165 /* Short form of mov based on type, BPF_X: dst_reg = src_reg, BPF_K: dst_reg = imm32 */ 166 167 #define BPF_MOV64_RAW(TYPE, DST, SRC, IMM) \ 168 ((struct bpf_insn) { \ 169 .code = BPF_ALU64 | BPF_MOV | BPF_SRC(TYPE), \ 170 .dst_reg = DST, \ 171 .src_reg = SRC, \ 172 .off = 0, \ 173 .imm = IMM }) 174 175 #define BPF_MOV32_RAW(TYPE, DST, SRC, IMM) \ 176 ((struct bpf_insn) { \ 177 .code = BPF_ALU | BPF_MOV | BPF_SRC(TYPE), \ 178 .dst_reg = DST, \ 179 .src_reg = SRC, \ 180 .off = 0, \ 181 .imm = IMM }) 182 183 /* Direct packet access, R0 = *(uint *) (skb->data + imm32) */ 184 185 #define BPF_LD_ABS(SIZE, IMM) \ 186 ((struct bpf_insn) { \ 187 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_ABS, \ 188 .dst_reg = 0, \ 189 .src_reg = 0, \ 190 .off = 0, \ 191 .imm = IMM }) 192 193 /* Indirect packet access, R0 = *(uint *) (skb->data + src_reg + imm32) */ 194 195 #define BPF_LD_IND(SIZE, SRC, IMM) \ 196 ((struct bpf_insn) { \ 197 .code = BPF_LD | BPF_SIZE(SIZE) | BPF_IND, \ 198 .dst_reg = 0, \ 199 .src_reg = SRC, \ 200 .off = 0, \ 201 .imm = IMM }) 202 203 /* Memory load, dst_reg = *(uint *) (src_reg + off16) */ 204 205 #define BPF_LDX_MEM(SIZE, DST, SRC, OFF) \ 206 ((struct bpf_insn) { \ 207 .code = BPF_LDX | BPF_SIZE(SIZE) | BPF_MEM, \ 208 .dst_reg = DST, \ 209 .src_reg = SRC, \ 210 .off = OFF, \ 211 .imm = 0 }) 212 213 /* Memory store, *(uint *) (dst_reg + off16) = src_reg */ 214 215 #define BPF_STX_MEM(SIZE, DST, SRC, OFF) \ 216 ((struct bpf_insn) { \ 217 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_MEM, \ 218 .dst_reg = DST, \ 219 .src_reg = SRC, \ 220 .off = OFF, \ 221 .imm = 0 }) 222 223 /* Atomic memory add, *(uint *)(dst_reg + off16) += src_reg */ 224 225 #define BPF_STX_XADD(SIZE, DST, SRC, OFF) \ 226 ((struct bpf_insn) { \ 227 .code = BPF_STX | BPF_SIZE(SIZE) | BPF_XADD, \ 228 .dst_reg = DST, \ 229 .src_reg = SRC, \ 230 .off = OFF, \ 231 .imm = 0 }) 232 233 /* Memory store, *(uint *) (dst_reg + off16) = imm32 */ 234 235 #define BPF_ST_MEM(SIZE, DST, OFF, IMM) \ 236 ((struct bpf_insn) { \ 237 .code = BPF_ST | BPF_SIZE(SIZE) | BPF_MEM, \ 238 .dst_reg = DST, \ 239 .src_reg = 0, \ 240 .off = OFF, \ 241 .imm = IMM }) 242 243 /* Conditional jumps against registers, if (dst_reg 'op' src_reg) goto pc + off16 */ 244 245 #define BPF_JMP_REG(OP, DST, SRC, OFF) \ 246 ((struct bpf_insn) { \ 247 .code = BPF_JMP | BPF_OP(OP) | BPF_X, \ 248 .dst_reg = DST, \ 249 .src_reg = SRC, \ 250 .off = OFF, \ 251 .imm = 0 }) 252 253 /* Conditional jumps against immediates, if (dst_reg 'op' imm32) goto pc + off16 */ 254 255 #define BPF_JMP_IMM(OP, DST, IMM, OFF) \ 256 ((struct bpf_insn) { \ 257 .code = BPF_JMP | BPF_OP(OP) | BPF_K, \ 258 .dst_reg = DST, \ 259 .src_reg = 0, \ 260 .off = OFF, \ 261 .imm = IMM }) 262 263 /* Function call */ 264 265 #define BPF_EMIT_CALL(FUNC) \ 266 ((struct bpf_insn) { \ 267 .code = BPF_JMP | BPF_CALL, \ 268 .dst_reg = 0, \ 269 .src_reg = 0, \ 270 .off = 0, \ 271 .imm = ((FUNC) - __bpf_call_base) }) 272 273 /* Raw code statement block */ 274 275 #define BPF_RAW_INSN(CODE, DST, SRC, OFF, IMM) \ 276 ((struct bpf_insn) { \ 277 .code = CODE, \ 278 .dst_reg = DST, \ 279 .src_reg = SRC, \ 280 .off = OFF, \ 281 .imm = IMM }) 282 283 /* Program exit */ 284 285 #define BPF_EXIT_INSN() \ 286 ((struct bpf_insn) { \ 287 .code = BPF_JMP | BPF_EXIT, \ 288 .dst_reg = 0, \ 289 .src_reg = 0, \ 290 .off = 0, \ 291 .imm = 0 }) 292 293 /* Internal classic blocks for direct assignment */ 294 295 #define __BPF_STMT(CODE, K) \ 296 ((struct sock_filter) BPF_STMT(CODE, K)) 297 298 #define __BPF_JUMP(CODE, K, JT, JF) \ 299 ((struct sock_filter) BPF_JUMP(CODE, K, JT, JF)) 300 301 #define bytes_to_bpf_size(bytes) \ 302 ({ \ 303 int bpf_size = -EINVAL; \ 304 \ 305 if (bytes == sizeof(u8)) \ 306 bpf_size = BPF_B; \ 307 else if (bytes == sizeof(u16)) \ 308 bpf_size = BPF_H; \ 309 else if (bytes == sizeof(u32)) \ 310 bpf_size = BPF_W; \ 311 else if (bytes == sizeof(u64)) \ 312 bpf_size = BPF_DW; \ 313 \ 314 bpf_size; \ 315 }) 316 317 #ifdef CONFIG_COMPAT 318 /* A struct sock_filter is architecture independent. */ 319 struct compat_sock_fprog { 320 u16 len; 321 compat_uptr_t filter; /* struct sock_filter * */ 322 }; 323 #endif 324 325 struct sock_fprog_kern { 326 u16 len; 327 struct sock_filter *filter; 328 }; 329 330 struct bpf_binary_header { 331 unsigned int pages; 332 u8 image[]; 333 }; 334 335 struct bpf_prog { 336 u16 pages; /* Number of allocated pages */ 337 kmemcheck_bitfield_begin(meta); 338 u16 jited:1, /* Is our filter JIT'ed? */ 339 gpl_compatible:1, /* Is filter GPL compatible? */ 340 cb_access:1, /* Is control block accessed? */ 341 dst_needed:1; /* Do we need dst entry? */ 342 kmemcheck_bitfield_end(meta); 343 u32 len; /* Number of filter blocks */ 344 enum bpf_prog_type type; /* Type of BPF program */ 345 struct bpf_prog_aux *aux; /* Auxiliary fields */ 346 struct sock_fprog_kern *orig_prog; /* Original BPF program */ 347 unsigned int (*bpf_func)(const struct sk_buff *skb, 348 const struct bpf_insn *filter); 349 /* Instructions for interpreter */ 350 union { 351 struct sock_filter insns[0]; 352 struct bpf_insn insnsi[0]; 353 }; 354 }; 355 356 struct sk_filter { 357 atomic_t refcnt; 358 struct rcu_head rcu; 359 struct bpf_prog *prog; 360 }; 361 362 #define BPF_PROG_RUN(filter, ctx) (*filter->bpf_func)(ctx, filter->insnsi) 363 364 #define BPF_SKB_CB_LEN QDISC_CB_PRIV_LEN 365 366 struct bpf_skb_data_end { 367 struct qdisc_skb_cb qdisc_cb; 368 void *data_end; 369 }; 370 371 /* compute the linear packet data range [data, data_end) which 372 * will be accessed by cls_bpf and act_bpf programs 373 */ 374 static inline void bpf_compute_data_end(struct sk_buff *skb) 375 { 376 struct bpf_skb_data_end *cb = (struct bpf_skb_data_end *)skb->cb; 377 378 BUILD_BUG_ON(sizeof(*cb) > FIELD_SIZEOF(struct sk_buff, cb)); 379 cb->data_end = skb->data + skb_headlen(skb); 380 } 381 382 static inline u8 *bpf_skb_cb(struct sk_buff *skb) 383 { 384 /* eBPF programs may read/write skb->cb[] area to transfer meta 385 * data between tail calls. Since this also needs to work with 386 * tc, that scratch memory is mapped to qdisc_skb_cb's data area. 387 * 388 * In some socket filter cases, the cb unfortunately needs to be 389 * saved/restored so that protocol specific skb->cb[] data won't 390 * be lost. In any case, due to unpriviledged eBPF programs 391 * attached to sockets, we need to clear the bpf_skb_cb() area 392 * to not leak previous contents to user space. 393 */ 394 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != BPF_SKB_CB_LEN); 395 BUILD_BUG_ON(FIELD_SIZEOF(struct __sk_buff, cb) != 396 FIELD_SIZEOF(struct qdisc_skb_cb, data)); 397 398 return qdisc_skb_cb(skb)->data; 399 } 400 401 static inline u32 bpf_prog_run_save_cb(const struct bpf_prog *prog, 402 struct sk_buff *skb) 403 { 404 u8 *cb_data = bpf_skb_cb(skb); 405 u8 cb_saved[BPF_SKB_CB_LEN]; 406 u32 res; 407 408 if (unlikely(prog->cb_access)) { 409 memcpy(cb_saved, cb_data, sizeof(cb_saved)); 410 memset(cb_data, 0, sizeof(cb_saved)); 411 } 412 413 res = BPF_PROG_RUN(prog, skb); 414 415 if (unlikely(prog->cb_access)) 416 memcpy(cb_data, cb_saved, sizeof(cb_saved)); 417 418 return res; 419 } 420 421 static inline u32 bpf_prog_run_clear_cb(const struct bpf_prog *prog, 422 struct sk_buff *skb) 423 { 424 u8 *cb_data = bpf_skb_cb(skb); 425 426 if (unlikely(prog->cb_access)) 427 memset(cb_data, 0, BPF_SKB_CB_LEN); 428 429 return BPF_PROG_RUN(prog, skb); 430 } 431 432 static inline unsigned int bpf_prog_size(unsigned int proglen) 433 { 434 return max(sizeof(struct bpf_prog), 435 offsetof(struct bpf_prog, insns[proglen])); 436 } 437 438 static inline bool bpf_prog_was_classic(const struct bpf_prog *prog) 439 { 440 /* When classic BPF programs have been loaded and the arch 441 * does not have a classic BPF JIT (anymore), they have been 442 * converted via bpf_migrate_filter() to eBPF and thus always 443 * have an unspec program type. 444 */ 445 return prog->type == BPF_PROG_TYPE_UNSPEC; 446 } 447 448 #define bpf_classic_proglen(fprog) (fprog->len * sizeof(fprog->filter[0])) 449 450 #ifdef CONFIG_DEBUG_SET_MODULE_RONX 451 static inline void bpf_prog_lock_ro(struct bpf_prog *fp) 452 { 453 set_memory_ro((unsigned long)fp, fp->pages); 454 } 455 456 static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) 457 { 458 set_memory_rw((unsigned long)fp, fp->pages); 459 } 460 #else 461 static inline void bpf_prog_lock_ro(struct bpf_prog *fp) 462 { 463 } 464 465 static inline void bpf_prog_unlock_ro(struct bpf_prog *fp) 466 { 467 } 468 #endif /* CONFIG_DEBUG_SET_MODULE_RONX */ 469 470 int sk_filter(struct sock *sk, struct sk_buff *skb); 471 472 struct bpf_prog *bpf_prog_select_runtime(struct bpf_prog *fp, int *err); 473 void bpf_prog_free(struct bpf_prog *fp); 474 475 struct bpf_prog *bpf_prog_alloc(unsigned int size, gfp_t gfp_extra_flags); 476 struct bpf_prog *bpf_prog_realloc(struct bpf_prog *fp_old, unsigned int size, 477 gfp_t gfp_extra_flags); 478 void __bpf_prog_free(struct bpf_prog *fp); 479 480 static inline void bpf_prog_unlock_free(struct bpf_prog *fp) 481 { 482 bpf_prog_unlock_ro(fp); 483 __bpf_prog_free(fp); 484 } 485 486 typedef int (*bpf_aux_classic_check_t)(struct sock_filter *filter, 487 unsigned int flen); 488 489 int bpf_prog_create(struct bpf_prog **pfp, struct sock_fprog_kern *fprog); 490 int bpf_prog_create_from_user(struct bpf_prog **pfp, struct sock_fprog *fprog, 491 bpf_aux_classic_check_t trans, bool save_orig); 492 void bpf_prog_destroy(struct bpf_prog *fp); 493 494 int sk_attach_filter(struct sock_fprog *fprog, struct sock *sk); 495 int sk_attach_bpf(u32 ufd, struct sock *sk); 496 int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk); 497 int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk); 498 int sk_detach_filter(struct sock *sk); 499 int sk_get_filter(struct sock *sk, struct sock_filter __user *filter, 500 unsigned int len); 501 502 bool sk_filter_charge(struct sock *sk, struct sk_filter *fp); 503 void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp); 504 505 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5); 506 507 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog); 508 bool bpf_helper_changes_skb_data(void *func); 509 510 struct bpf_prog *bpf_patch_insn_single(struct bpf_prog *prog, u32 off, 511 const struct bpf_insn *patch, u32 len); 512 513 #ifdef CONFIG_BPF_JIT 514 extern int bpf_jit_enable; 515 extern int bpf_jit_harden; 516 517 typedef void (*bpf_jit_fill_hole_t)(void *area, unsigned int size); 518 519 struct bpf_binary_header * 520 bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr, 521 unsigned int alignment, 522 bpf_jit_fill_hole_t bpf_fill_ill_insns); 523 void bpf_jit_binary_free(struct bpf_binary_header *hdr); 524 525 void bpf_jit_compile(struct bpf_prog *fp); 526 void bpf_jit_free(struct bpf_prog *fp); 527 528 struct bpf_prog *bpf_jit_blind_constants(struct bpf_prog *fp); 529 void bpf_jit_prog_release_other(struct bpf_prog *fp, struct bpf_prog *fp_other); 530 531 static inline void bpf_jit_dump(unsigned int flen, unsigned int proglen, 532 u32 pass, void *image) 533 { 534 pr_err("flen=%u proglen=%u pass=%u image=%pK from=%s pid=%d\n", flen, 535 proglen, pass, image, current->comm, task_pid_nr(current)); 536 537 if (image) 538 print_hex_dump(KERN_ERR, "JIT code: ", DUMP_PREFIX_OFFSET, 539 16, 1, image, proglen, false); 540 } 541 542 static inline bool bpf_jit_is_ebpf(void) 543 { 544 # ifdef CONFIG_HAVE_EBPF_JIT 545 return true; 546 # else 547 return false; 548 # endif 549 } 550 551 static inline bool bpf_jit_blinding_enabled(void) 552 { 553 /* These are the prerequisites, should someone ever have the 554 * idea to call blinding outside of them, we make sure to 555 * bail out. 556 */ 557 if (!bpf_jit_is_ebpf()) 558 return false; 559 if (!bpf_jit_enable) 560 return false; 561 if (!bpf_jit_harden) 562 return false; 563 if (bpf_jit_harden == 1 && capable(CAP_SYS_ADMIN)) 564 return false; 565 566 return true; 567 } 568 #else 569 static inline void bpf_jit_compile(struct bpf_prog *fp) 570 { 571 } 572 573 static inline void bpf_jit_free(struct bpf_prog *fp) 574 { 575 bpf_prog_unlock_free(fp); 576 } 577 #endif /* CONFIG_BPF_JIT */ 578 579 #define BPF_ANC BIT(15) 580 581 static inline bool bpf_needs_clear_a(const struct sock_filter *first) 582 { 583 switch (first->code) { 584 case BPF_RET | BPF_K: 585 case BPF_LD | BPF_W | BPF_LEN: 586 return false; 587 588 case BPF_LD | BPF_W | BPF_ABS: 589 case BPF_LD | BPF_H | BPF_ABS: 590 case BPF_LD | BPF_B | BPF_ABS: 591 if (first->k == SKF_AD_OFF + SKF_AD_ALU_XOR_X) 592 return true; 593 return false; 594 595 default: 596 return true; 597 } 598 } 599 600 static inline u16 bpf_anc_helper(const struct sock_filter *ftest) 601 { 602 BUG_ON(ftest->code & BPF_ANC); 603 604 switch (ftest->code) { 605 case BPF_LD | BPF_W | BPF_ABS: 606 case BPF_LD | BPF_H | BPF_ABS: 607 case BPF_LD | BPF_B | BPF_ABS: 608 #define BPF_ANCILLARY(CODE) case SKF_AD_OFF + SKF_AD_##CODE: \ 609 return BPF_ANC | SKF_AD_##CODE 610 switch (ftest->k) { 611 BPF_ANCILLARY(PROTOCOL); 612 BPF_ANCILLARY(PKTTYPE); 613 BPF_ANCILLARY(IFINDEX); 614 BPF_ANCILLARY(NLATTR); 615 BPF_ANCILLARY(NLATTR_NEST); 616 BPF_ANCILLARY(MARK); 617 BPF_ANCILLARY(QUEUE); 618 BPF_ANCILLARY(HATYPE); 619 BPF_ANCILLARY(RXHASH); 620 BPF_ANCILLARY(CPU); 621 BPF_ANCILLARY(ALU_XOR_X); 622 BPF_ANCILLARY(VLAN_TAG); 623 BPF_ANCILLARY(VLAN_TAG_PRESENT); 624 BPF_ANCILLARY(PAY_OFFSET); 625 BPF_ANCILLARY(RANDOM); 626 BPF_ANCILLARY(VLAN_TPID); 627 } 628 /* Fallthrough. */ 629 default: 630 return ftest->code; 631 } 632 } 633 634 void *bpf_internal_load_pointer_neg_helper(const struct sk_buff *skb, 635 int k, unsigned int size); 636 637 static inline void *bpf_load_pointer(const struct sk_buff *skb, int k, 638 unsigned int size, void *buffer) 639 { 640 if (k >= 0) 641 return skb_header_pointer(skb, k, size, buffer); 642 643 return bpf_internal_load_pointer_neg_helper(skb, k, size); 644 } 645 646 static inline int bpf_tell_extensions(void) 647 { 648 return SKF_AD_MAX; 649 } 650 651 #endif /* __LINUX_FILTER_H__ */ 652