1 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 2 * 3 * This program is free software; you can redistribute it and/or 4 * modify it under the terms of version 2 of the GNU General Public 5 * License as published by the Free Software Foundation. 6 */ 7 #ifndef _UAPI__LINUX_BPF_H__ 8 #define _UAPI__LINUX_BPF_H__ 9 10 #include <linux/types.h> 11 #include <linux/bpf_common.h> 12 13 /* Extended instruction set based on top of classic BPF */ 14 15 /* instruction classes */ 16 #define BPF_ALU64 0x07 /* alu mode in double word width */ 17 18 /* ld/ldx fields */ 19 #define BPF_DW 0x18 /* double word */ 20 #define BPF_XADD 0xc0 /* exclusive add */ 21 22 /* alu/jmp fields */ 23 #define BPF_MOV 0xb0 /* mov reg to reg */ 24 #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ 25 26 /* change endianness of a register */ 27 #define BPF_END 0xd0 /* flags for endianness conversion: */ 28 #define BPF_TO_LE 0x00 /* convert to little-endian */ 29 #define BPF_TO_BE 0x08 /* convert to big-endian */ 30 #define BPF_FROM_LE BPF_TO_LE 31 #define BPF_FROM_BE BPF_TO_BE 32 33 #define BPF_JNE 0x50 /* jump != */ 34 #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ 35 #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ 36 #define BPF_CALL 0x80 /* function call */ 37 #define BPF_EXIT 0x90 /* function return */ 38 39 /* Register numbers */ 40 enum { 41 BPF_REG_0 = 0, 42 BPF_REG_1, 43 BPF_REG_2, 44 BPF_REG_3, 45 BPF_REG_4, 46 BPF_REG_5, 47 BPF_REG_6, 48 BPF_REG_7, 49 BPF_REG_8, 50 BPF_REG_9, 51 BPF_REG_10, 52 __MAX_BPF_REG, 53 }; 54 55 /* BPF has 10 general purpose 64-bit registers and stack frame. */ 56 #define MAX_BPF_REG __MAX_BPF_REG 57 58 struct bpf_insn { 59 __u8 code; /* opcode */ 60 __u8 dst_reg:4; /* dest register */ 61 __u8 src_reg:4; /* source register */ 62 __s16 off; /* signed offset */ 63 __s32 imm; /* signed immediate constant */ 64 }; 65 66 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ 67 struct bpf_lpm_trie_key { 68 __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ 69 __u8 data[0]; /* Arbitrary size */ 70 }; 71 72 /* BPF syscall commands, see bpf(2) man-page for details. */ 73 enum bpf_cmd { 74 BPF_MAP_CREATE, 75 BPF_MAP_LOOKUP_ELEM, 76 BPF_MAP_UPDATE_ELEM, 77 BPF_MAP_DELETE_ELEM, 78 BPF_MAP_GET_NEXT_KEY, 79 BPF_PROG_LOAD, 80 BPF_OBJ_PIN, 81 BPF_OBJ_GET, 82 BPF_PROG_ATTACH, 83 BPF_PROG_DETACH, 84 BPF_PROG_TEST_RUN, 85 }; 86 87 enum bpf_map_type { 88 BPF_MAP_TYPE_UNSPEC, 89 BPF_MAP_TYPE_HASH, 90 BPF_MAP_TYPE_ARRAY, 91 BPF_MAP_TYPE_PROG_ARRAY, 92 BPF_MAP_TYPE_PERF_EVENT_ARRAY, 93 BPF_MAP_TYPE_PERCPU_HASH, 94 BPF_MAP_TYPE_PERCPU_ARRAY, 95 BPF_MAP_TYPE_STACK_TRACE, 96 BPF_MAP_TYPE_CGROUP_ARRAY, 97 BPF_MAP_TYPE_LRU_HASH, 98 BPF_MAP_TYPE_LRU_PERCPU_HASH, 99 BPF_MAP_TYPE_LPM_TRIE, 100 BPF_MAP_TYPE_ARRAY_OF_MAPS, 101 BPF_MAP_TYPE_HASH_OF_MAPS, 102 }; 103 104 enum bpf_prog_type { 105 BPF_PROG_TYPE_UNSPEC, 106 BPF_PROG_TYPE_SOCKET_FILTER, 107 BPF_PROG_TYPE_KPROBE, 108 BPF_PROG_TYPE_SCHED_CLS, 109 BPF_PROG_TYPE_SCHED_ACT, 110 BPF_PROG_TYPE_TRACEPOINT, 111 BPF_PROG_TYPE_XDP, 112 BPF_PROG_TYPE_PERF_EVENT, 113 BPF_PROG_TYPE_CGROUP_SKB, 114 BPF_PROG_TYPE_CGROUP_SOCK, 115 BPF_PROG_TYPE_LWT_IN, 116 BPF_PROG_TYPE_LWT_OUT, 117 BPF_PROG_TYPE_LWT_XMIT, 118 }; 119 120 enum bpf_attach_type { 121 BPF_CGROUP_INET_INGRESS, 122 BPF_CGROUP_INET_EGRESS, 123 BPF_CGROUP_INET_SOCK_CREATE, 124 __MAX_BPF_ATTACH_TYPE 125 }; 126 127 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE 128 129 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command 130 * to the given target_fd cgroup the descendent cgroup will be able to 131 * override effective bpf program that was inherited from this cgroup 132 */ 133 #define BPF_F_ALLOW_OVERRIDE (1U << 0) 134 135 #define BPF_PSEUDO_MAP_FD 1 136 137 /* flags for BPF_MAP_UPDATE_ELEM command */ 138 #define BPF_ANY 0 /* create new element or update existing */ 139 #define BPF_NOEXIST 1 /* create new element if it didn't exist */ 140 #define BPF_EXIST 2 /* update existing element */ 141 142 #define BPF_F_NO_PREALLOC (1U << 0) 143 /* Instead of having one common LRU list in the 144 * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list 145 * which can scale and perform better. 146 * Note, the LRU nodes (including free nodes) cannot be moved 147 * across different LRU lists. 148 */ 149 #define BPF_F_NO_COMMON_LRU (1U << 1) 150 151 union bpf_attr { 152 struct { /* anonymous struct used by BPF_MAP_CREATE command */ 153 __u32 map_type; /* one of enum bpf_map_type */ 154 __u32 key_size; /* size of key in bytes */ 155 __u32 value_size; /* size of value in bytes */ 156 __u32 max_entries; /* max number of entries in a map */ 157 __u32 map_flags; /* prealloc or not */ 158 __u32 inner_map_fd; /* fd pointing to the inner map */ 159 }; 160 161 struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ 162 __u32 map_fd; 163 __aligned_u64 key; 164 union { 165 __aligned_u64 value; 166 __aligned_u64 next_key; 167 }; 168 __u64 flags; 169 }; 170 171 struct { /* anonymous struct used by BPF_PROG_LOAD command */ 172 __u32 prog_type; /* one of enum bpf_prog_type */ 173 __u32 insn_cnt; 174 __aligned_u64 insns; 175 __aligned_u64 license; 176 __u32 log_level; /* verbosity level of verifier */ 177 __u32 log_size; /* size of user buffer */ 178 __aligned_u64 log_buf; /* user supplied buffer */ 179 __u32 kern_version; /* checked when prog_type=kprobe */ 180 }; 181 182 struct { /* anonymous struct used by BPF_OBJ_* commands */ 183 __aligned_u64 pathname; 184 __u32 bpf_fd; 185 }; 186 187 struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ 188 __u32 target_fd; /* container object to attach to */ 189 __u32 attach_bpf_fd; /* eBPF program to attach */ 190 __u32 attach_type; 191 __u32 attach_flags; 192 }; 193 194 struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ 195 __u32 prog_fd; 196 __u32 retval; 197 __u32 data_size_in; 198 __u32 data_size_out; 199 __aligned_u64 data_in; 200 __aligned_u64 data_out; 201 __u32 repeat; 202 __u32 duration; 203 } test; 204 } __attribute__((aligned(8))); 205 206 /* BPF helper function descriptions: 207 * 208 * void *bpf_map_lookup_elem(&map, &key) 209 * Return: Map value or NULL 210 * 211 * int bpf_map_update_elem(&map, &key, &value, flags) 212 * Return: 0 on success or negative error 213 * 214 * int bpf_map_delete_elem(&map, &key) 215 * Return: 0 on success or negative error 216 * 217 * int bpf_probe_read(void *dst, int size, void *src) 218 * Return: 0 on success or negative error 219 * 220 * u64 bpf_ktime_get_ns(void) 221 * Return: current ktime 222 * 223 * int bpf_trace_printk(const char *fmt, int fmt_size, ...) 224 * Return: length of buffer written or negative error 225 * 226 * u32 bpf_prandom_u32(void) 227 * Return: random value 228 * 229 * u32 bpf_raw_smp_processor_id(void) 230 * Return: SMP processor ID 231 * 232 * int bpf_skb_store_bytes(skb, offset, from, len, flags) 233 * store bytes into packet 234 * @skb: pointer to skb 235 * @offset: offset within packet from skb->mac_header 236 * @from: pointer where to copy bytes from 237 * @len: number of bytes to store into packet 238 * @flags: bit 0 - if true, recompute skb->csum 239 * other bits - reserved 240 * Return: 0 on success or negative error 241 * 242 * int bpf_l3_csum_replace(skb, offset, from, to, flags) 243 * recompute IP checksum 244 * @skb: pointer to skb 245 * @offset: offset within packet where IP checksum is located 246 * @from: old value of header field 247 * @to: new value of header field 248 * @flags: bits 0-3 - size of header field 249 * other bits - reserved 250 * Return: 0 on success or negative error 251 * 252 * int bpf_l4_csum_replace(skb, offset, from, to, flags) 253 * recompute TCP/UDP checksum 254 * @skb: pointer to skb 255 * @offset: offset within packet where TCP/UDP checksum is located 256 * @from: old value of header field 257 * @to: new value of header field 258 * @flags: bits 0-3 - size of header field 259 * bit 4 - is pseudo header 260 * other bits - reserved 261 * Return: 0 on success or negative error 262 * 263 * int bpf_tail_call(ctx, prog_array_map, index) 264 * jump into another BPF program 265 * @ctx: context pointer passed to next program 266 * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY 267 * @index: index inside array that selects specific program to run 268 * Return: 0 on success or negative error 269 * 270 * int bpf_clone_redirect(skb, ifindex, flags) 271 * redirect to another netdev 272 * @skb: pointer to skb 273 * @ifindex: ifindex of the net device 274 * @flags: bit 0 - if set, redirect to ingress instead of egress 275 * other bits - reserved 276 * Return: 0 on success or negative error 277 * 278 * u64 bpf_get_current_pid_tgid(void) 279 * Return: current->tgid << 32 | current->pid 280 * 281 * u64 bpf_get_current_uid_gid(void) 282 * Return: current_gid << 32 | current_uid 283 * 284 * int bpf_get_current_comm(char *buf, int size_of_buf) 285 * stores current->comm into buf 286 * Return: 0 on success or negative error 287 * 288 * u32 bpf_get_cgroup_classid(skb) 289 * retrieve a proc's classid 290 * @skb: pointer to skb 291 * Return: classid if != 0 292 * 293 * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) 294 * Return: 0 on success or negative error 295 * 296 * int bpf_skb_vlan_pop(skb) 297 * Return: 0 on success or negative error 298 * 299 * int bpf_skb_get_tunnel_key(skb, key, size, flags) 300 * int bpf_skb_set_tunnel_key(skb, key, size, flags) 301 * retrieve or populate tunnel metadata 302 * @skb: pointer to skb 303 * @key: pointer to 'struct bpf_tunnel_key' 304 * @size: size of 'struct bpf_tunnel_key' 305 * @flags: room for future extensions 306 * Return: 0 on success or negative error 307 * 308 * u64 bpf_perf_event_read(&map, index) 309 * Return: Number events read or error code 310 * 311 * int bpf_redirect(ifindex, flags) 312 * redirect to another netdev 313 * @ifindex: ifindex of the net device 314 * @flags: bit 0 - if set, redirect to ingress instead of egress 315 * other bits - reserved 316 * Return: TC_ACT_REDIRECT 317 * 318 * u32 bpf_get_route_realm(skb) 319 * retrieve a dst's tclassid 320 * @skb: pointer to skb 321 * Return: realm if != 0 322 * 323 * int bpf_perf_event_output(ctx, map, index, data, size) 324 * output perf raw sample 325 * @ctx: struct pt_regs* 326 * @map: pointer to perf_event_array map 327 * @index: index of event in the map 328 * @data: data on stack to be output as raw data 329 * @size: size of data 330 * Return: 0 on success or negative error 331 * 332 * int bpf_get_stackid(ctx, map, flags) 333 * walk user or kernel stack and return id 334 * @ctx: struct pt_regs* 335 * @map: pointer to stack_trace map 336 * @flags: bits 0-7 - numer of stack frames to skip 337 * bit 8 - collect user stack instead of kernel 338 * bit 9 - compare stacks by hash only 339 * bit 10 - if two different stacks hash into the same stackid 340 * discard old 341 * other bits - reserved 342 * Return: >= 0 stackid on success or negative error 343 * 344 * s64 bpf_csum_diff(from, from_size, to, to_size, seed) 345 * calculate csum diff 346 * @from: raw from buffer 347 * @from_size: length of from buffer 348 * @to: raw to buffer 349 * @to_size: length of to buffer 350 * @seed: optional seed 351 * Return: csum result or negative error code 352 * 353 * int bpf_skb_get_tunnel_opt(skb, opt, size) 354 * retrieve tunnel options metadata 355 * @skb: pointer to skb 356 * @opt: pointer to raw tunnel option data 357 * @size: size of @opt 358 * Return: option size 359 * 360 * int bpf_skb_set_tunnel_opt(skb, opt, size) 361 * populate tunnel options metadata 362 * @skb: pointer to skb 363 * @opt: pointer to raw tunnel option data 364 * @size: size of @opt 365 * Return: 0 on success or negative error 366 * 367 * int bpf_skb_change_proto(skb, proto, flags) 368 * Change protocol of the skb. Currently supported is v4 -> v6, 369 * v6 -> v4 transitions. The helper will also resize the skb. eBPF 370 * program is expected to fill the new headers via skb_store_bytes 371 * and lX_csum_replace. 372 * @skb: pointer to skb 373 * @proto: new skb->protocol type 374 * @flags: reserved 375 * Return: 0 on success or negative error 376 * 377 * int bpf_skb_change_type(skb, type) 378 * Change packet type of skb. 379 * @skb: pointer to skb 380 * @type: new skb->pkt_type type 381 * Return: 0 on success or negative error 382 * 383 * int bpf_skb_under_cgroup(skb, map, index) 384 * Check cgroup2 membership of skb 385 * @skb: pointer to skb 386 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 387 * @index: index of the cgroup in the bpf_map 388 * Return: 389 * == 0 skb failed the cgroup2 descendant test 390 * == 1 skb succeeded the cgroup2 descendant test 391 * < 0 error 392 * 393 * u32 bpf_get_hash_recalc(skb) 394 * Retrieve and possibly recalculate skb->hash. 395 * @skb: pointer to skb 396 * Return: hash 397 * 398 * u64 bpf_get_current_task(void) 399 * Returns current task_struct 400 * Return: current 401 * 402 * int bpf_probe_write_user(void *dst, void *src, int len) 403 * safely attempt to write to a location 404 * @dst: destination address in userspace 405 * @src: source address on stack 406 * @len: number of bytes to copy 407 * Return: 0 on success or negative error 408 * 409 * int bpf_current_task_under_cgroup(map, index) 410 * Check cgroup2 membership of current task 411 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 412 * @index: index of the cgroup in the bpf_map 413 * Return: 414 * == 0 current failed the cgroup2 descendant test 415 * == 1 current succeeded the cgroup2 descendant test 416 * < 0 error 417 * 418 * int bpf_skb_change_tail(skb, len, flags) 419 * The helper will resize the skb to the given new size, to be used f.e. 420 * with control messages. 421 * @skb: pointer to skb 422 * @len: new skb length 423 * @flags: reserved 424 * Return: 0 on success or negative error 425 * 426 * int bpf_skb_pull_data(skb, len) 427 * The helper will pull in non-linear data in case the skb is non-linear 428 * and not all of len are part of the linear section. Only needed for 429 * read/write with direct packet access. 430 * @skb: pointer to skb 431 * @len: len to make read/writeable 432 * Return: 0 on success or negative error 433 * 434 * s64 bpf_csum_update(skb, csum) 435 * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. 436 * @skb: pointer to skb 437 * @csum: csum to add 438 * Return: csum on success or negative error 439 * 440 * void bpf_set_hash_invalid(skb) 441 * Invalidate current skb->hash. 442 * @skb: pointer to skb 443 * 444 * int bpf_get_numa_node_id() 445 * Return: Id of current NUMA node. 446 * 447 * int bpf_skb_change_head() 448 * Grows headroom of skb and adjusts MAC header offset accordingly. 449 * Will extends/reallocae as required automatically. 450 * May change skb data pointer and will thus invalidate any check 451 * performed for direct packet access. 452 * @skb: pointer to skb 453 * @len: length of header to be pushed in front 454 * @flags: Flags (unused for now) 455 * Return: 0 on success or negative error 456 * 457 * int bpf_xdp_adjust_head(xdp_md, delta) 458 * Adjust the xdp_md.data by delta 459 * @xdp_md: pointer to xdp_md 460 * @delta: An positive/negative integer to be added to xdp_md.data 461 * Return: 0 on success or negative on error 462 * 463 * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) 464 * Copy a NUL terminated string from unsafe address. In case the string 465 * length is smaller than size, the target is not padded with further NUL 466 * bytes. In case the string length is larger than size, just count-1 467 * bytes are copied and the last byte is set to NUL. 468 * @dst: destination address 469 * @size: maximum number of bytes to copy, including the trailing NUL 470 * @unsafe_ptr: unsafe address 471 * Return: 472 * > 0 length of the string including the trailing NUL on success 473 * < 0 error 474 * 475 * u64 bpf_get_socket_cookie(skb) 476 * Get the cookie for the socket stored inside sk_buff. 477 * @skb: pointer to skb 478 * Return: 8 Bytes non-decreasing number on success or 0 if the socket 479 * field is missing inside sk_buff 480 * 481 * u32 bpf_get_socket_uid(skb) 482 * Get the owner uid of the socket stored inside sk_buff. 483 * @skb: pointer to skb 484 * Return: uid of the socket owner on success or overflowuid if failed. 485 */ 486 #define __BPF_FUNC_MAPPER(FN) \ 487 FN(unspec), \ 488 FN(map_lookup_elem), \ 489 FN(map_update_elem), \ 490 FN(map_delete_elem), \ 491 FN(probe_read), \ 492 FN(ktime_get_ns), \ 493 FN(trace_printk), \ 494 FN(get_prandom_u32), \ 495 FN(get_smp_processor_id), \ 496 FN(skb_store_bytes), \ 497 FN(l3_csum_replace), \ 498 FN(l4_csum_replace), \ 499 FN(tail_call), \ 500 FN(clone_redirect), \ 501 FN(get_current_pid_tgid), \ 502 FN(get_current_uid_gid), \ 503 FN(get_current_comm), \ 504 FN(get_cgroup_classid), \ 505 FN(skb_vlan_push), \ 506 FN(skb_vlan_pop), \ 507 FN(skb_get_tunnel_key), \ 508 FN(skb_set_tunnel_key), \ 509 FN(perf_event_read), \ 510 FN(redirect), \ 511 FN(get_route_realm), \ 512 FN(perf_event_output), \ 513 FN(skb_load_bytes), \ 514 FN(get_stackid), \ 515 FN(csum_diff), \ 516 FN(skb_get_tunnel_opt), \ 517 FN(skb_set_tunnel_opt), \ 518 FN(skb_change_proto), \ 519 FN(skb_change_type), \ 520 FN(skb_under_cgroup), \ 521 FN(get_hash_recalc), \ 522 FN(get_current_task), \ 523 FN(probe_write_user), \ 524 FN(current_task_under_cgroup), \ 525 FN(skb_change_tail), \ 526 FN(skb_pull_data), \ 527 FN(csum_update), \ 528 FN(set_hash_invalid), \ 529 FN(get_numa_node_id), \ 530 FN(skb_change_head), \ 531 FN(xdp_adjust_head), \ 532 FN(probe_read_str), \ 533 FN(get_socket_cookie), \ 534 FN(get_socket_uid), 535 536 /* integer value in 'imm' field of BPF_CALL instruction selects which helper 537 * function eBPF program intends to call 538 */ 539 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x 540 enum bpf_func_id { 541 __BPF_FUNC_MAPPER(__BPF_ENUM_FN) 542 __BPF_FUNC_MAX_ID, 543 }; 544 #undef __BPF_ENUM_FN 545 546 /* All flags used by eBPF helper functions, placed here. */ 547 548 /* BPF_FUNC_skb_store_bytes flags. */ 549 #define BPF_F_RECOMPUTE_CSUM (1ULL << 0) 550 #define BPF_F_INVALIDATE_HASH (1ULL << 1) 551 552 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. 553 * First 4 bits are for passing the header field size. 554 */ 555 #define BPF_F_HDR_FIELD_MASK 0xfULL 556 557 /* BPF_FUNC_l4_csum_replace flags. */ 558 #define BPF_F_PSEUDO_HDR (1ULL << 4) 559 #define BPF_F_MARK_MANGLED_0 (1ULL << 5) 560 #define BPF_F_MARK_ENFORCE (1ULL << 6) 561 562 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ 563 #define BPF_F_INGRESS (1ULL << 0) 564 565 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ 566 #define BPF_F_TUNINFO_IPV6 (1ULL << 0) 567 568 /* BPF_FUNC_get_stackid flags. */ 569 #define BPF_F_SKIP_FIELD_MASK 0xffULL 570 #define BPF_F_USER_STACK (1ULL << 8) 571 #define BPF_F_FAST_STACK_CMP (1ULL << 9) 572 #define BPF_F_REUSE_STACKID (1ULL << 10) 573 574 /* BPF_FUNC_skb_set_tunnel_key flags. */ 575 #define BPF_F_ZERO_CSUM_TX (1ULL << 1) 576 #define BPF_F_DONT_FRAGMENT (1ULL << 2) 577 578 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ 579 #define BPF_F_INDEX_MASK 0xffffffffULL 580 #define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK 581 /* BPF_FUNC_perf_event_output for sk_buff input context. */ 582 #define BPF_F_CTXLEN_MASK (0xfffffULL << 32) 583 584 /* user accessible mirror of in-kernel sk_buff. 585 * new fields can only be added to the end of this structure 586 */ 587 struct __sk_buff { 588 __u32 len; 589 __u32 pkt_type; 590 __u32 mark; 591 __u32 queue_mapping; 592 __u32 protocol; 593 __u32 vlan_present; 594 __u32 vlan_tci; 595 __u32 vlan_proto; 596 __u32 priority; 597 __u32 ingress_ifindex; 598 __u32 ifindex; 599 __u32 tc_index; 600 __u32 cb[5]; 601 __u32 hash; 602 __u32 tc_classid; 603 __u32 data; 604 __u32 data_end; 605 __u32 napi_id; 606 }; 607 608 struct bpf_tunnel_key { 609 __u32 tunnel_id; 610 union { 611 __u32 remote_ipv4; 612 __u32 remote_ipv6[4]; 613 }; 614 __u8 tunnel_tos; 615 __u8 tunnel_ttl; 616 __u16 tunnel_ext; 617 __u32 tunnel_label; 618 }; 619 620 /* Generic BPF return codes which all BPF program types may support. 621 * The values are binary compatible with their TC_ACT_* counter-part to 622 * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT 623 * programs. 624 * 625 * XDP is handled seprately, see XDP_*. 626 */ 627 enum bpf_ret_code { 628 BPF_OK = 0, 629 /* 1 reserved */ 630 BPF_DROP = 2, 631 /* 3-6 reserved */ 632 BPF_REDIRECT = 7, 633 /* >127 are reserved for prog type specific return codes */ 634 }; 635 636 struct bpf_sock { 637 __u32 bound_dev_if; 638 __u32 family; 639 __u32 type; 640 __u32 protocol; 641 }; 642 643 #define XDP_PACKET_HEADROOM 256 644 645 /* User return codes for XDP prog type. 646 * A valid XDP program must return one of these defined values. All other 647 * return codes are reserved for future use. Unknown return codes will result 648 * in packet drop. 649 */ 650 enum xdp_action { 651 XDP_ABORTED = 0, 652 XDP_DROP, 653 XDP_PASS, 654 XDP_TX, 655 }; 656 657 /* user accessible metadata for XDP packet hook 658 * new fields must be added to the end of this structure 659 */ 660 struct xdp_md { 661 __u32 data; 662 __u32 data_end; 663 }; 664 665 #endif /* _UAPI__LINUX_BPF_H__ */ 666