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 /* jmp encodings */ 34 #define BPF_JNE 0x50 /* jump != */ 35 #define BPF_JLT 0xa0 /* LT is unsigned, '<' */ 36 #define BPF_JLE 0xb0 /* LE is unsigned, '<=' */ 37 #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ 38 #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ 39 #define BPF_JSLT 0xc0 /* SLT is signed, '<' */ 40 #define BPF_JSLE 0xd0 /* SLE is signed, '<=' */ 41 #define BPF_CALL 0x80 /* function call */ 42 #define BPF_EXIT 0x90 /* function return */ 43 44 /* Register numbers */ 45 enum { 46 BPF_REG_0 = 0, 47 BPF_REG_1, 48 BPF_REG_2, 49 BPF_REG_3, 50 BPF_REG_4, 51 BPF_REG_5, 52 BPF_REG_6, 53 BPF_REG_7, 54 BPF_REG_8, 55 BPF_REG_9, 56 BPF_REG_10, 57 __MAX_BPF_REG, 58 }; 59 60 /* BPF has 10 general purpose 64-bit registers and stack frame. */ 61 #define MAX_BPF_REG __MAX_BPF_REG 62 63 struct bpf_insn { 64 __u8 code; /* opcode */ 65 __u8 dst_reg:4; /* dest register */ 66 __u8 src_reg:4; /* source register */ 67 __s16 off; /* signed offset */ 68 __s32 imm; /* signed immediate constant */ 69 }; 70 71 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ 72 struct bpf_lpm_trie_key { 73 __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ 74 __u8 data[0]; /* Arbitrary size */ 75 }; 76 77 /* BPF syscall commands, see bpf(2) man-page for details. */ 78 enum bpf_cmd { 79 BPF_MAP_CREATE, 80 BPF_MAP_LOOKUP_ELEM, 81 BPF_MAP_UPDATE_ELEM, 82 BPF_MAP_DELETE_ELEM, 83 BPF_MAP_GET_NEXT_KEY, 84 BPF_PROG_LOAD, 85 BPF_OBJ_PIN, 86 BPF_OBJ_GET, 87 BPF_PROG_ATTACH, 88 BPF_PROG_DETACH, 89 BPF_PROG_TEST_RUN, 90 BPF_PROG_GET_NEXT_ID, 91 BPF_MAP_GET_NEXT_ID, 92 BPF_PROG_GET_FD_BY_ID, 93 BPF_MAP_GET_FD_BY_ID, 94 BPF_OBJ_GET_INFO_BY_FD, 95 }; 96 97 enum bpf_map_type { 98 BPF_MAP_TYPE_UNSPEC, 99 BPF_MAP_TYPE_HASH, 100 BPF_MAP_TYPE_ARRAY, 101 BPF_MAP_TYPE_PROG_ARRAY, 102 BPF_MAP_TYPE_PERF_EVENT_ARRAY, 103 BPF_MAP_TYPE_PERCPU_HASH, 104 BPF_MAP_TYPE_PERCPU_ARRAY, 105 BPF_MAP_TYPE_STACK_TRACE, 106 BPF_MAP_TYPE_CGROUP_ARRAY, 107 BPF_MAP_TYPE_LRU_HASH, 108 BPF_MAP_TYPE_LRU_PERCPU_HASH, 109 BPF_MAP_TYPE_LPM_TRIE, 110 BPF_MAP_TYPE_ARRAY_OF_MAPS, 111 BPF_MAP_TYPE_HASH_OF_MAPS, 112 BPF_MAP_TYPE_DEVMAP, 113 BPF_MAP_TYPE_SOCKMAP, 114 }; 115 116 enum bpf_prog_type { 117 BPF_PROG_TYPE_UNSPEC, 118 BPF_PROG_TYPE_SOCKET_FILTER, 119 BPF_PROG_TYPE_KPROBE, 120 BPF_PROG_TYPE_SCHED_CLS, 121 BPF_PROG_TYPE_SCHED_ACT, 122 BPF_PROG_TYPE_TRACEPOINT, 123 BPF_PROG_TYPE_XDP, 124 BPF_PROG_TYPE_PERF_EVENT, 125 BPF_PROG_TYPE_CGROUP_SKB, 126 BPF_PROG_TYPE_CGROUP_SOCK, 127 BPF_PROG_TYPE_LWT_IN, 128 BPF_PROG_TYPE_LWT_OUT, 129 BPF_PROG_TYPE_LWT_XMIT, 130 BPF_PROG_TYPE_SOCK_OPS, 131 BPF_PROG_TYPE_SK_SKB, 132 }; 133 134 enum bpf_attach_type { 135 BPF_CGROUP_INET_INGRESS, 136 BPF_CGROUP_INET_EGRESS, 137 BPF_CGROUP_INET_SOCK_CREATE, 138 BPF_CGROUP_SOCK_OPS, 139 BPF_SK_SKB_STREAM_PARSER, 140 BPF_SK_SKB_STREAM_VERDICT, 141 __MAX_BPF_ATTACH_TYPE 142 }; 143 144 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE 145 146 enum bpf_sockmap_flags { 147 BPF_SOCKMAP_UNSPEC, 148 BPF_SOCKMAP_STRPARSER, 149 __MAX_BPF_SOCKMAP_FLAG 150 }; 151 152 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command 153 * to the given target_fd cgroup the descendent cgroup will be able to 154 * override effective bpf program that was inherited from this cgroup 155 */ 156 #define BPF_F_ALLOW_OVERRIDE (1U << 0) 157 158 /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the 159 * verifier will perform strict alignment checking as if the kernel 160 * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set, 161 * and NET_IP_ALIGN defined to 2. 162 */ 163 #define BPF_F_STRICT_ALIGNMENT (1U << 0) 164 165 #define BPF_PSEUDO_MAP_FD 1 166 167 /* flags for BPF_MAP_UPDATE_ELEM command */ 168 #define BPF_ANY 0 /* create new element or update existing */ 169 #define BPF_NOEXIST 1 /* create new element if it didn't exist */ 170 #define BPF_EXIST 2 /* update existing element */ 171 172 /* flags for BPF_MAP_CREATE command */ 173 #define BPF_F_NO_PREALLOC (1U << 0) 174 /* Instead of having one common LRU list in the 175 * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list 176 * which can scale and perform better. 177 * Note, the LRU nodes (including free nodes) cannot be moved 178 * across different LRU lists. 179 */ 180 #define BPF_F_NO_COMMON_LRU (1U << 1) 181 /* Specify numa node during map creation */ 182 #define BPF_F_NUMA_NODE (1U << 2) 183 184 union bpf_attr { 185 struct { /* anonymous struct used by BPF_MAP_CREATE command */ 186 __u32 map_type; /* one of enum bpf_map_type */ 187 __u32 key_size; /* size of key in bytes */ 188 __u32 value_size; /* size of value in bytes */ 189 __u32 max_entries; /* max number of entries in a map */ 190 __u32 map_flags; /* BPF_MAP_CREATE related 191 * flags defined above. 192 */ 193 __u32 inner_map_fd; /* fd pointing to the inner map */ 194 __u32 numa_node; /* numa node (effective only if 195 * BPF_F_NUMA_NODE is set). 196 */ 197 }; 198 199 struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ 200 __u32 map_fd; 201 __aligned_u64 key; 202 union { 203 __aligned_u64 value; 204 __aligned_u64 next_key; 205 }; 206 __u64 flags; 207 }; 208 209 struct { /* anonymous struct used by BPF_PROG_LOAD command */ 210 __u32 prog_type; /* one of enum bpf_prog_type */ 211 __u32 insn_cnt; 212 __aligned_u64 insns; 213 __aligned_u64 license; 214 __u32 log_level; /* verbosity level of verifier */ 215 __u32 log_size; /* size of user buffer */ 216 __aligned_u64 log_buf; /* user supplied buffer */ 217 __u32 kern_version; /* checked when prog_type=kprobe */ 218 __u32 prog_flags; 219 }; 220 221 struct { /* anonymous struct used by BPF_OBJ_* commands */ 222 __aligned_u64 pathname; 223 __u32 bpf_fd; 224 }; 225 226 struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ 227 __u32 target_fd; /* container object to attach to */ 228 __u32 attach_bpf_fd; /* eBPF program to attach */ 229 __u32 attach_type; 230 __u32 attach_flags; 231 }; 232 233 struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ 234 __u32 prog_fd; 235 __u32 retval; 236 __u32 data_size_in; 237 __u32 data_size_out; 238 __aligned_u64 data_in; 239 __aligned_u64 data_out; 240 __u32 repeat; 241 __u32 duration; 242 } test; 243 244 struct { /* anonymous struct used by BPF_*_GET_*_ID */ 245 union { 246 __u32 start_id; 247 __u32 prog_id; 248 __u32 map_id; 249 }; 250 __u32 next_id; 251 }; 252 253 struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ 254 __u32 bpf_fd; 255 __u32 info_len; 256 __aligned_u64 info; 257 } info; 258 } __attribute__((aligned(8))); 259 260 /* BPF helper function descriptions: 261 * 262 * void *bpf_map_lookup_elem(&map, &key) 263 * Return: Map value or NULL 264 * 265 * int bpf_map_update_elem(&map, &key, &value, flags) 266 * Return: 0 on success or negative error 267 * 268 * int bpf_map_delete_elem(&map, &key) 269 * Return: 0 on success or negative error 270 * 271 * int bpf_probe_read(void *dst, int size, void *src) 272 * Return: 0 on success or negative error 273 * 274 * u64 bpf_ktime_get_ns(void) 275 * Return: current ktime 276 * 277 * int bpf_trace_printk(const char *fmt, int fmt_size, ...) 278 * Return: length of buffer written or negative error 279 * 280 * u32 bpf_prandom_u32(void) 281 * Return: random value 282 * 283 * u32 bpf_raw_smp_processor_id(void) 284 * Return: SMP processor ID 285 * 286 * int bpf_skb_store_bytes(skb, offset, from, len, flags) 287 * store bytes into packet 288 * @skb: pointer to skb 289 * @offset: offset within packet from skb->mac_header 290 * @from: pointer where to copy bytes from 291 * @len: number of bytes to store into packet 292 * @flags: bit 0 - if true, recompute skb->csum 293 * other bits - reserved 294 * Return: 0 on success or negative error 295 * 296 * int bpf_l3_csum_replace(skb, offset, from, to, flags) 297 * recompute IP checksum 298 * @skb: pointer to skb 299 * @offset: offset within packet where IP checksum is located 300 * @from: old value of header field 301 * @to: new value of header field 302 * @flags: bits 0-3 - size of header field 303 * other bits - reserved 304 * Return: 0 on success or negative error 305 * 306 * int bpf_l4_csum_replace(skb, offset, from, to, flags) 307 * recompute TCP/UDP checksum 308 * @skb: pointer to skb 309 * @offset: offset within packet where TCP/UDP checksum is located 310 * @from: old value of header field 311 * @to: new value of header field 312 * @flags: bits 0-3 - size of header field 313 * bit 4 - is pseudo header 314 * other bits - reserved 315 * Return: 0 on success or negative error 316 * 317 * int bpf_tail_call(ctx, prog_array_map, index) 318 * jump into another BPF program 319 * @ctx: context pointer passed to next program 320 * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY 321 * @index: index inside array that selects specific program to run 322 * Return: 0 on success or negative error 323 * 324 * int bpf_clone_redirect(skb, ifindex, flags) 325 * redirect to another netdev 326 * @skb: pointer to skb 327 * @ifindex: ifindex of the net device 328 * @flags: bit 0 - if set, redirect to ingress instead of egress 329 * other bits - reserved 330 * Return: 0 on success or negative error 331 * 332 * u64 bpf_get_current_pid_tgid(void) 333 * Return: current->tgid << 32 | current->pid 334 * 335 * u64 bpf_get_current_uid_gid(void) 336 * Return: current_gid << 32 | current_uid 337 * 338 * int bpf_get_current_comm(char *buf, int size_of_buf) 339 * stores current->comm into buf 340 * Return: 0 on success or negative error 341 * 342 * u32 bpf_get_cgroup_classid(skb) 343 * retrieve a proc's classid 344 * @skb: pointer to skb 345 * Return: classid if != 0 346 * 347 * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) 348 * Return: 0 on success or negative error 349 * 350 * int bpf_skb_vlan_pop(skb) 351 * Return: 0 on success or negative error 352 * 353 * int bpf_skb_get_tunnel_key(skb, key, size, flags) 354 * int bpf_skb_set_tunnel_key(skb, key, size, flags) 355 * retrieve or populate tunnel metadata 356 * @skb: pointer to skb 357 * @key: pointer to 'struct bpf_tunnel_key' 358 * @size: size of 'struct bpf_tunnel_key' 359 * @flags: room for future extensions 360 * Return: 0 on success or negative error 361 * 362 * u64 bpf_perf_event_read(map, flags) 363 * read perf event counter value 364 * @map: pointer to perf_event_array map 365 * @flags: index of event in the map or bitmask flags 366 * Return: value of perf event counter read or error code 367 * 368 * int bpf_redirect(ifindex, flags) 369 * redirect to another netdev 370 * @ifindex: ifindex of the net device 371 * @flags: bit 0 - if set, redirect to ingress instead of egress 372 * other bits - reserved 373 * Return: TC_ACT_REDIRECT 374 * 375 * u32 bpf_get_route_realm(skb) 376 * retrieve a dst's tclassid 377 * @skb: pointer to skb 378 * Return: realm if != 0 379 * 380 * int bpf_perf_event_output(ctx, map, flags, data, size) 381 * output perf raw sample 382 * @ctx: struct pt_regs* 383 * @map: pointer to perf_event_array map 384 * @flags: index of event in the map or bitmask flags 385 * @data: data on stack to be output as raw data 386 * @size: size of data 387 * Return: 0 on success or negative error 388 * 389 * int bpf_get_stackid(ctx, map, flags) 390 * walk user or kernel stack and return id 391 * @ctx: struct pt_regs* 392 * @map: pointer to stack_trace map 393 * @flags: bits 0-7 - numer of stack frames to skip 394 * bit 8 - collect user stack instead of kernel 395 * bit 9 - compare stacks by hash only 396 * bit 10 - if two different stacks hash into the same stackid 397 * discard old 398 * other bits - reserved 399 * Return: >= 0 stackid on success or negative error 400 * 401 * s64 bpf_csum_diff(from, from_size, to, to_size, seed) 402 * calculate csum diff 403 * @from: raw from buffer 404 * @from_size: length of from buffer 405 * @to: raw to buffer 406 * @to_size: length of to buffer 407 * @seed: optional seed 408 * Return: csum result or negative error code 409 * 410 * int bpf_skb_get_tunnel_opt(skb, opt, size) 411 * retrieve tunnel options metadata 412 * @skb: pointer to skb 413 * @opt: pointer to raw tunnel option data 414 * @size: size of @opt 415 * Return: option size 416 * 417 * int bpf_skb_set_tunnel_opt(skb, opt, size) 418 * populate tunnel options metadata 419 * @skb: pointer to skb 420 * @opt: pointer to raw tunnel option data 421 * @size: size of @opt 422 * Return: 0 on success or negative error 423 * 424 * int bpf_skb_change_proto(skb, proto, flags) 425 * Change protocol of the skb. Currently supported is v4 -> v6, 426 * v6 -> v4 transitions. The helper will also resize the skb. eBPF 427 * program is expected to fill the new headers via skb_store_bytes 428 * and lX_csum_replace. 429 * @skb: pointer to skb 430 * @proto: new skb->protocol type 431 * @flags: reserved 432 * Return: 0 on success or negative error 433 * 434 * int bpf_skb_change_type(skb, type) 435 * Change packet type of skb. 436 * @skb: pointer to skb 437 * @type: new skb->pkt_type type 438 * Return: 0 on success or negative error 439 * 440 * int bpf_skb_under_cgroup(skb, map, index) 441 * Check cgroup2 membership of skb 442 * @skb: pointer to skb 443 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 444 * @index: index of the cgroup in the bpf_map 445 * Return: 446 * == 0 skb failed the cgroup2 descendant test 447 * == 1 skb succeeded the cgroup2 descendant test 448 * < 0 error 449 * 450 * u32 bpf_get_hash_recalc(skb) 451 * Retrieve and possibly recalculate skb->hash. 452 * @skb: pointer to skb 453 * Return: hash 454 * 455 * u64 bpf_get_current_task(void) 456 * Returns current task_struct 457 * Return: current 458 * 459 * int bpf_probe_write_user(void *dst, void *src, int len) 460 * safely attempt to write to a location 461 * @dst: destination address in userspace 462 * @src: source address on stack 463 * @len: number of bytes to copy 464 * Return: 0 on success or negative error 465 * 466 * int bpf_current_task_under_cgroup(map, index) 467 * Check cgroup2 membership of current task 468 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 469 * @index: index of the cgroup in the bpf_map 470 * Return: 471 * == 0 current failed the cgroup2 descendant test 472 * == 1 current succeeded the cgroup2 descendant test 473 * < 0 error 474 * 475 * int bpf_skb_change_tail(skb, len, flags) 476 * The helper will resize the skb to the given new size, to be used f.e. 477 * with control messages. 478 * @skb: pointer to skb 479 * @len: new skb length 480 * @flags: reserved 481 * Return: 0 on success or negative error 482 * 483 * int bpf_skb_pull_data(skb, len) 484 * The helper will pull in non-linear data in case the skb is non-linear 485 * and not all of len are part of the linear section. Only needed for 486 * read/write with direct packet access. 487 * @skb: pointer to skb 488 * @len: len to make read/writeable 489 * Return: 0 on success or negative error 490 * 491 * s64 bpf_csum_update(skb, csum) 492 * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. 493 * @skb: pointer to skb 494 * @csum: csum to add 495 * Return: csum on success or negative error 496 * 497 * void bpf_set_hash_invalid(skb) 498 * Invalidate current skb->hash. 499 * @skb: pointer to skb 500 * 501 * int bpf_get_numa_node_id() 502 * Return: Id of current NUMA node. 503 * 504 * int bpf_skb_change_head() 505 * Grows headroom of skb and adjusts MAC header offset accordingly. 506 * Will extends/reallocae as required automatically. 507 * May change skb data pointer and will thus invalidate any check 508 * performed for direct packet access. 509 * @skb: pointer to skb 510 * @len: length of header to be pushed in front 511 * @flags: Flags (unused for now) 512 * Return: 0 on success or negative error 513 * 514 * int bpf_xdp_adjust_head(xdp_md, delta) 515 * Adjust the xdp_md.data by delta 516 * @xdp_md: pointer to xdp_md 517 * @delta: An positive/negative integer to be added to xdp_md.data 518 * Return: 0 on success or negative on error 519 * 520 * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) 521 * Copy a NUL terminated string from unsafe address. In case the string 522 * length is smaller than size, the target is not padded with further NUL 523 * bytes. In case the string length is larger than size, just count-1 524 * bytes are copied and the last byte is set to NUL. 525 * @dst: destination address 526 * @size: maximum number of bytes to copy, including the trailing NUL 527 * @unsafe_ptr: unsafe address 528 * Return: 529 * > 0 length of the string including the trailing NUL on success 530 * < 0 error 531 * 532 * u64 bpf_get_socket_cookie(skb) 533 * Get the cookie for the socket stored inside sk_buff. 534 * @skb: pointer to skb 535 * Return: 8 Bytes non-decreasing number on success or 0 if the socket 536 * field is missing inside sk_buff 537 * 538 * u32 bpf_get_socket_uid(skb) 539 * Get the owner uid of the socket stored inside sk_buff. 540 * @skb: pointer to skb 541 * Return: uid of the socket owner on success or overflowuid if failed. 542 * 543 * u32 bpf_set_hash(skb, hash) 544 * Set full skb->hash. 545 * @skb: pointer to skb 546 * @hash: hash to set 547 * 548 * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen) 549 * Calls setsockopt. Not all opts are available, only those with 550 * integer optvals plus TCP_CONGESTION. 551 * Supported levels: SOL_SOCKET and IPROTO_TCP 552 * @bpf_socket: pointer to bpf_socket 553 * @level: SOL_SOCKET or IPROTO_TCP 554 * @optname: option name 555 * @optval: pointer to option value 556 * @optlen: length of optval in byes 557 * Return: 0 or negative error 558 * 559 * int bpf_skb_adjust_room(skb, len_diff, mode, flags) 560 * Grow or shrink room in sk_buff. 561 * @skb: pointer to skb 562 * @len_diff: (signed) amount of room to grow/shrink 563 * @mode: operation mode (enum bpf_adj_room_mode) 564 * @flags: reserved for future use 565 * Return: 0 on success or negative error code 566 * 567 * int bpf_sk_redirect_map(map, key, flags) 568 * Redirect skb to a sock in map using key as a lookup key for the 569 * sock in map. 570 * @map: pointer to sockmap 571 * @key: key to lookup sock in map 572 * @flags: reserved for future use 573 * Return: SK_REDIRECT 574 * 575 * int bpf_sock_map_update(skops, map, key, flags) 576 * @skops: pointer to bpf_sock_ops 577 * @map: pointer to sockmap to update 578 * @key: key to insert/update sock in map 579 * @flags: same flags as map update elem 580 */ 581 #define __BPF_FUNC_MAPPER(FN) \ 582 FN(unspec), \ 583 FN(map_lookup_elem), \ 584 FN(map_update_elem), \ 585 FN(map_delete_elem), \ 586 FN(probe_read), \ 587 FN(ktime_get_ns), \ 588 FN(trace_printk), \ 589 FN(get_prandom_u32), \ 590 FN(get_smp_processor_id), \ 591 FN(skb_store_bytes), \ 592 FN(l3_csum_replace), \ 593 FN(l4_csum_replace), \ 594 FN(tail_call), \ 595 FN(clone_redirect), \ 596 FN(get_current_pid_tgid), \ 597 FN(get_current_uid_gid), \ 598 FN(get_current_comm), \ 599 FN(get_cgroup_classid), \ 600 FN(skb_vlan_push), \ 601 FN(skb_vlan_pop), \ 602 FN(skb_get_tunnel_key), \ 603 FN(skb_set_tunnel_key), \ 604 FN(perf_event_read), \ 605 FN(redirect), \ 606 FN(get_route_realm), \ 607 FN(perf_event_output), \ 608 FN(skb_load_bytes), \ 609 FN(get_stackid), \ 610 FN(csum_diff), \ 611 FN(skb_get_tunnel_opt), \ 612 FN(skb_set_tunnel_opt), \ 613 FN(skb_change_proto), \ 614 FN(skb_change_type), \ 615 FN(skb_under_cgroup), \ 616 FN(get_hash_recalc), \ 617 FN(get_current_task), \ 618 FN(probe_write_user), \ 619 FN(current_task_under_cgroup), \ 620 FN(skb_change_tail), \ 621 FN(skb_pull_data), \ 622 FN(csum_update), \ 623 FN(set_hash_invalid), \ 624 FN(get_numa_node_id), \ 625 FN(skb_change_head), \ 626 FN(xdp_adjust_head), \ 627 FN(probe_read_str), \ 628 FN(get_socket_cookie), \ 629 FN(get_socket_uid), \ 630 FN(set_hash), \ 631 FN(setsockopt), \ 632 FN(skb_adjust_room), \ 633 FN(redirect_map), \ 634 FN(sk_redirect_map), \ 635 FN(sock_map_update), 636 637 /* integer value in 'imm' field of BPF_CALL instruction selects which helper 638 * function eBPF program intends to call 639 */ 640 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x 641 enum bpf_func_id { 642 __BPF_FUNC_MAPPER(__BPF_ENUM_FN) 643 __BPF_FUNC_MAX_ID, 644 }; 645 #undef __BPF_ENUM_FN 646 647 /* All flags used by eBPF helper functions, placed here. */ 648 649 /* BPF_FUNC_skb_store_bytes flags. */ 650 #define BPF_F_RECOMPUTE_CSUM (1ULL << 0) 651 #define BPF_F_INVALIDATE_HASH (1ULL << 1) 652 653 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. 654 * First 4 bits are for passing the header field size. 655 */ 656 #define BPF_F_HDR_FIELD_MASK 0xfULL 657 658 /* BPF_FUNC_l4_csum_replace flags. */ 659 #define BPF_F_PSEUDO_HDR (1ULL << 4) 660 #define BPF_F_MARK_MANGLED_0 (1ULL << 5) 661 #define BPF_F_MARK_ENFORCE (1ULL << 6) 662 663 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ 664 #define BPF_F_INGRESS (1ULL << 0) 665 666 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ 667 #define BPF_F_TUNINFO_IPV6 (1ULL << 0) 668 669 /* BPF_FUNC_get_stackid flags. */ 670 #define BPF_F_SKIP_FIELD_MASK 0xffULL 671 #define BPF_F_USER_STACK (1ULL << 8) 672 #define BPF_F_FAST_STACK_CMP (1ULL << 9) 673 #define BPF_F_REUSE_STACKID (1ULL << 10) 674 675 /* BPF_FUNC_skb_set_tunnel_key flags. */ 676 #define BPF_F_ZERO_CSUM_TX (1ULL << 1) 677 #define BPF_F_DONT_FRAGMENT (1ULL << 2) 678 679 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ 680 #define BPF_F_INDEX_MASK 0xffffffffULL 681 #define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK 682 /* BPF_FUNC_perf_event_output for sk_buff input context. */ 683 #define BPF_F_CTXLEN_MASK (0xfffffULL << 32) 684 685 /* Mode for BPF_FUNC_skb_adjust_room helper. */ 686 enum bpf_adj_room_mode { 687 BPF_ADJ_ROOM_NET, 688 }; 689 690 /* user accessible mirror of in-kernel sk_buff. 691 * new fields can only be added to the end of this structure 692 */ 693 struct __sk_buff { 694 __u32 len; 695 __u32 pkt_type; 696 __u32 mark; 697 __u32 queue_mapping; 698 __u32 protocol; 699 __u32 vlan_present; 700 __u32 vlan_tci; 701 __u32 vlan_proto; 702 __u32 priority; 703 __u32 ingress_ifindex; 704 __u32 ifindex; 705 __u32 tc_index; 706 __u32 cb[5]; 707 __u32 hash; 708 __u32 tc_classid; 709 __u32 data; 710 __u32 data_end; 711 __u32 napi_id; 712 713 /* accessed by BPF_PROG_TYPE_sk_skb types */ 714 __u32 family; 715 __u32 remote_ip4; /* Stored in network byte order */ 716 __u32 local_ip4; /* Stored in network byte order */ 717 __u32 remote_ip6[4]; /* Stored in network byte order */ 718 __u32 local_ip6[4]; /* Stored in network byte order */ 719 __u32 remote_port; /* Stored in network byte order */ 720 __u32 local_port; /* stored in host byte order */ 721 }; 722 723 struct bpf_tunnel_key { 724 __u32 tunnel_id; 725 union { 726 __u32 remote_ipv4; 727 __u32 remote_ipv6[4]; 728 }; 729 __u8 tunnel_tos; 730 __u8 tunnel_ttl; 731 __u16 tunnel_ext; 732 __u32 tunnel_label; 733 }; 734 735 /* Generic BPF return codes which all BPF program types may support. 736 * The values are binary compatible with their TC_ACT_* counter-part to 737 * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT 738 * programs. 739 * 740 * XDP is handled seprately, see XDP_*. 741 */ 742 enum bpf_ret_code { 743 BPF_OK = 0, 744 /* 1 reserved */ 745 BPF_DROP = 2, 746 /* 3-6 reserved */ 747 BPF_REDIRECT = 7, 748 /* >127 are reserved for prog type specific return codes */ 749 }; 750 751 struct bpf_sock { 752 __u32 bound_dev_if; 753 __u32 family; 754 __u32 type; 755 __u32 protocol; 756 }; 757 758 #define XDP_PACKET_HEADROOM 256 759 760 /* User return codes for XDP prog type. 761 * A valid XDP program must return one of these defined values. All other 762 * return codes are reserved for future use. Unknown return codes will result 763 * in packet drop. 764 */ 765 enum xdp_action { 766 XDP_ABORTED = 0, 767 XDP_DROP, 768 XDP_PASS, 769 XDP_TX, 770 }; 771 772 /* user accessible metadata for XDP packet hook 773 * new fields must be added to the end of this structure 774 */ 775 struct xdp_md { 776 __u32 data; 777 __u32 data_end; 778 }; 779 780 enum sk_action { 781 SK_ABORTED = 0, 782 SK_DROP, 783 SK_REDIRECT, 784 }; 785 786 #define BPF_TAG_SIZE 8 787 788 struct bpf_prog_info { 789 __u32 type; 790 __u32 id; 791 __u8 tag[BPF_TAG_SIZE]; 792 __u32 jited_prog_len; 793 __u32 xlated_prog_len; 794 __aligned_u64 jited_prog_insns; 795 __aligned_u64 xlated_prog_insns; 796 } __attribute__((aligned(8))); 797 798 struct bpf_map_info { 799 __u32 type; 800 __u32 id; 801 __u32 key_size; 802 __u32 value_size; 803 __u32 max_entries; 804 __u32 map_flags; 805 } __attribute__((aligned(8))); 806 807 /* User bpf_sock_ops struct to access socket values and specify request ops 808 * and their replies. 809 * Some of this fields are in network (bigendian) byte order and may need 810 * to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h). 811 * New fields can only be added at the end of this structure 812 */ 813 struct bpf_sock_ops { 814 __u32 op; 815 union { 816 __u32 reply; 817 __u32 replylong[4]; 818 }; 819 __u32 family; 820 __u32 remote_ip4; /* Stored in network byte order */ 821 __u32 local_ip4; /* Stored in network byte order */ 822 __u32 remote_ip6[4]; /* Stored in network byte order */ 823 __u32 local_ip6[4]; /* Stored in network byte order */ 824 __u32 remote_port; /* Stored in network byte order */ 825 __u32 local_port; /* stored in host byte order */ 826 }; 827 828 /* List of known BPF sock_ops operators. 829 * New entries can only be added at the end 830 */ 831 enum { 832 BPF_SOCK_OPS_VOID, 833 BPF_SOCK_OPS_TIMEOUT_INIT, /* Should return SYN-RTO value to use or 834 * -1 if default value should be used 835 */ 836 BPF_SOCK_OPS_RWND_INIT, /* Should return initial advertized 837 * window (in packets) or -1 if default 838 * value should be used 839 */ 840 BPF_SOCK_OPS_TCP_CONNECT_CB, /* Calls BPF program right before an 841 * active connection is initialized 842 */ 843 BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB, /* Calls BPF program when an 844 * active connection is 845 * established 846 */ 847 BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB, /* Calls BPF program when a 848 * passive connection is 849 * established 850 */ 851 BPF_SOCK_OPS_NEEDS_ECN, /* If connection's congestion control 852 * needs ECN 853 */ 854 }; 855 856 #define TCP_BPF_IW 1001 /* Set TCP initial congestion window */ 857 #define TCP_BPF_SNDCWND_CLAMP 1002 /* Set sndcwnd_clamp */ 858 859 #endif /* _UAPI__LINUX_BPF_H__ */ 860