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 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command 147 * to the given target_fd cgroup the descendent cgroup will be able to 148 * override effective bpf program that was inherited from this cgroup 149 */ 150 #define BPF_F_ALLOW_OVERRIDE (1U << 0) 151 152 /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the 153 * verifier will perform strict alignment checking as if the kernel 154 * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set, 155 * and NET_IP_ALIGN defined to 2. 156 */ 157 #define BPF_F_STRICT_ALIGNMENT (1U << 0) 158 159 #define BPF_PSEUDO_MAP_FD 1 160 161 /* flags for BPF_MAP_UPDATE_ELEM command */ 162 #define BPF_ANY 0 /* create new element or update existing */ 163 #define BPF_NOEXIST 1 /* create new element if it didn't exist */ 164 #define BPF_EXIST 2 /* update existing element */ 165 166 /* flags for BPF_MAP_CREATE command */ 167 #define BPF_F_NO_PREALLOC (1U << 0) 168 /* Instead of having one common LRU list in the 169 * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list 170 * which can scale and perform better. 171 * Note, the LRU nodes (including free nodes) cannot be moved 172 * across different LRU lists. 173 */ 174 #define BPF_F_NO_COMMON_LRU (1U << 1) 175 /* Specify numa node during map creation */ 176 #define BPF_F_NUMA_NODE (1U << 2) 177 178 union bpf_attr { 179 struct { /* anonymous struct used by BPF_MAP_CREATE command */ 180 __u32 map_type; /* one of enum bpf_map_type */ 181 __u32 key_size; /* size of key in bytes */ 182 __u32 value_size; /* size of value in bytes */ 183 __u32 max_entries; /* max number of entries in a map */ 184 __u32 map_flags; /* BPF_MAP_CREATE related 185 * flags defined above. 186 */ 187 __u32 inner_map_fd; /* fd pointing to the inner map */ 188 __u32 numa_node; /* numa node (effective only if 189 * BPF_F_NUMA_NODE is set). 190 */ 191 }; 192 193 struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ 194 __u32 map_fd; 195 __aligned_u64 key; 196 union { 197 __aligned_u64 value; 198 __aligned_u64 next_key; 199 }; 200 __u64 flags; 201 }; 202 203 struct { /* anonymous struct used by BPF_PROG_LOAD command */ 204 __u32 prog_type; /* one of enum bpf_prog_type */ 205 __u32 insn_cnt; 206 __aligned_u64 insns; 207 __aligned_u64 license; 208 __u32 log_level; /* verbosity level of verifier */ 209 __u32 log_size; /* size of user buffer */ 210 __aligned_u64 log_buf; /* user supplied buffer */ 211 __u32 kern_version; /* checked when prog_type=kprobe */ 212 __u32 prog_flags; 213 }; 214 215 struct { /* anonymous struct used by BPF_OBJ_* commands */ 216 __aligned_u64 pathname; 217 __u32 bpf_fd; 218 }; 219 220 struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ 221 __u32 target_fd; /* container object to attach to */ 222 __u32 attach_bpf_fd; /* eBPF program to attach */ 223 __u32 attach_type; 224 __u32 attach_flags; 225 }; 226 227 struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ 228 __u32 prog_fd; 229 __u32 retval; 230 __u32 data_size_in; 231 __u32 data_size_out; 232 __aligned_u64 data_in; 233 __aligned_u64 data_out; 234 __u32 repeat; 235 __u32 duration; 236 } test; 237 238 struct { /* anonymous struct used by BPF_*_GET_*_ID */ 239 union { 240 __u32 start_id; 241 __u32 prog_id; 242 __u32 map_id; 243 }; 244 __u32 next_id; 245 }; 246 247 struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ 248 __u32 bpf_fd; 249 __u32 info_len; 250 __aligned_u64 info; 251 } info; 252 } __attribute__((aligned(8))); 253 254 /* BPF helper function descriptions: 255 * 256 * void *bpf_map_lookup_elem(&map, &key) 257 * Return: Map value or NULL 258 * 259 * int bpf_map_update_elem(&map, &key, &value, flags) 260 * Return: 0 on success or negative error 261 * 262 * int bpf_map_delete_elem(&map, &key) 263 * Return: 0 on success or negative error 264 * 265 * int bpf_probe_read(void *dst, int size, void *src) 266 * Return: 0 on success or negative error 267 * 268 * u64 bpf_ktime_get_ns(void) 269 * Return: current ktime 270 * 271 * int bpf_trace_printk(const char *fmt, int fmt_size, ...) 272 * Return: length of buffer written or negative error 273 * 274 * u32 bpf_prandom_u32(void) 275 * Return: random value 276 * 277 * u32 bpf_raw_smp_processor_id(void) 278 * Return: SMP processor ID 279 * 280 * int bpf_skb_store_bytes(skb, offset, from, len, flags) 281 * store bytes into packet 282 * @skb: pointer to skb 283 * @offset: offset within packet from skb->mac_header 284 * @from: pointer where to copy bytes from 285 * @len: number of bytes to store into packet 286 * @flags: bit 0 - if true, recompute skb->csum 287 * other bits - reserved 288 * Return: 0 on success or negative error 289 * 290 * int bpf_l3_csum_replace(skb, offset, from, to, flags) 291 * recompute IP checksum 292 * @skb: pointer to skb 293 * @offset: offset within packet where IP checksum is located 294 * @from: old value of header field 295 * @to: new value of header field 296 * @flags: bits 0-3 - size of header field 297 * other bits - reserved 298 * Return: 0 on success or negative error 299 * 300 * int bpf_l4_csum_replace(skb, offset, from, to, flags) 301 * recompute TCP/UDP checksum 302 * @skb: pointer to skb 303 * @offset: offset within packet where TCP/UDP checksum is located 304 * @from: old value of header field 305 * @to: new value of header field 306 * @flags: bits 0-3 - size of header field 307 * bit 4 - is pseudo header 308 * other bits - reserved 309 * Return: 0 on success or negative error 310 * 311 * int bpf_tail_call(ctx, prog_array_map, index) 312 * jump into another BPF program 313 * @ctx: context pointer passed to next program 314 * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY 315 * @index: 32-bit index inside array that selects specific program to run 316 * Return: 0 on success or negative error 317 * 318 * int bpf_clone_redirect(skb, ifindex, flags) 319 * redirect to another netdev 320 * @skb: pointer to skb 321 * @ifindex: ifindex of the net device 322 * @flags: bit 0 - if set, redirect to ingress instead of egress 323 * other bits - reserved 324 * Return: 0 on success or negative error 325 * 326 * u64 bpf_get_current_pid_tgid(void) 327 * Return: current->tgid << 32 | current->pid 328 * 329 * u64 bpf_get_current_uid_gid(void) 330 * Return: current_gid << 32 | current_uid 331 * 332 * int bpf_get_current_comm(char *buf, int size_of_buf) 333 * stores current->comm into buf 334 * Return: 0 on success or negative error 335 * 336 * u32 bpf_get_cgroup_classid(skb) 337 * retrieve a proc's classid 338 * @skb: pointer to skb 339 * Return: classid if != 0 340 * 341 * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) 342 * Return: 0 on success or negative error 343 * 344 * int bpf_skb_vlan_pop(skb) 345 * Return: 0 on success or negative error 346 * 347 * int bpf_skb_get_tunnel_key(skb, key, size, flags) 348 * int bpf_skb_set_tunnel_key(skb, key, size, flags) 349 * retrieve or populate tunnel metadata 350 * @skb: pointer to skb 351 * @key: pointer to 'struct bpf_tunnel_key' 352 * @size: size of 'struct bpf_tunnel_key' 353 * @flags: room for future extensions 354 * Return: 0 on success or negative error 355 * 356 * u64 bpf_perf_event_read(map, flags) 357 * read perf event counter value 358 * @map: pointer to perf_event_array map 359 * @flags: index of event in the map or bitmask flags 360 * Return: value of perf event counter read or error code 361 * 362 * int bpf_redirect(ifindex, flags) 363 * redirect to another netdev 364 * @ifindex: ifindex of the net device 365 * @flags: 366 * cls_bpf: 367 * bit 0 - if set, redirect to ingress instead of egress 368 * other bits - reserved 369 * xdp_bpf: 370 * all bits - reserved 371 * Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error 372 * xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error 373 * int bpf_redirect_map(map, key, flags) 374 * redirect to endpoint in map 375 * @map: pointer to dev map 376 * @key: index in map to lookup 377 * @flags: -- 378 * Return: XDP_REDIRECT on success or XDP_ABORT on error 379 * 380 * u32 bpf_get_route_realm(skb) 381 * retrieve a dst's tclassid 382 * @skb: pointer to skb 383 * Return: realm if != 0 384 * 385 * int bpf_perf_event_output(ctx, map, flags, data, size) 386 * output perf raw sample 387 * @ctx: struct pt_regs* 388 * @map: pointer to perf_event_array map 389 * @flags: index of event in the map or bitmask flags 390 * @data: data on stack to be output as raw data 391 * @size: size of data 392 * Return: 0 on success or negative error 393 * 394 * int bpf_get_stackid(ctx, map, flags) 395 * walk user or kernel stack and return id 396 * @ctx: struct pt_regs* 397 * @map: pointer to stack_trace map 398 * @flags: bits 0-7 - numer of stack frames to skip 399 * bit 8 - collect user stack instead of kernel 400 * bit 9 - compare stacks by hash only 401 * bit 10 - if two different stacks hash into the same stackid 402 * discard old 403 * other bits - reserved 404 * Return: >= 0 stackid on success or negative error 405 * 406 * s64 bpf_csum_diff(from, from_size, to, to_size, seed) 407 * calculate csum diff 408 * @from: raw from buffer 409 * @from_size: length of from buffer 410 * @to: raw to buffer 411 * @to_size: length of to buffer 412 * @seed: optional seed 413 * Return: csum result or negative error code 414 * 415 * int bpf_skb_get_tunnel_opt(skb, opt, size) 416 * retrieve tunnel options metadata 417 * @skb: pointer to skb 418 * @opt: pointer to raw tunnel option data 419 * @size: size of @opt 420 * Return: option size 421 * 422 * int bpf_skb_set_tunnel_opt(skb, opt, size) 423 * populate tunnel options metadata 424 * @skb: pointer to skb 425 * @opt: pointer to raw tunnel option data 426 * @size: size of @opt 427 * Return: 0 on success or negative error 428 * 429 * int bpf_skb_change_proto(skb, proto, flags) 430 * Change protocol of the skb. Currently supported is v4 -> v6, 431 * v6 -> v4 transitions. The helper will also resize the skb. eBPF 432 * program is expected to fill the new headers via skb_store_bytes 433 * and lX_csum_replace. 434 * @skb: pointer to skb 435 * @proto: new skb->protocol type 436 * @flags: reserved 437 * Return: 0 on success or negative error 438 * 439 * int bpf_skb_change_type(skb, type) 440 * Change packet type of skb. 441 * @skb: pointer to skb 442 * @type: new skb->pkt_type type 443 * Return: 0 on success or negative error 444 * 445 * int bpf_skb_under_cgroup(skb, map, index) 446 * Check cgroup2 membership of skb 447 * @skb: pointer to skb 448 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 449 * @index: index of the cgroup in the bpf_map 450 * Return: 451 * == 0 skb failed the cgroup2 descendant test 452 * == 1 skb succeeded the cgroup2 descendant test 453 * < 0 error 454 * 455 * u32 bpf_get_hash_recalc(skb) 456 * Retrieve and possibly recalculate skb->hash. 457 * @skb: pointer to skb 458 * Return: hash 459 * 460 * u64 bpf_get_current_task(void) 461 * Returns current task_struct 462 * Return: current 463 * 464 * int bpf_probe_write_user(void *dst, void *src, int len) 465 * safely attempt to write to a location 466 * @dst: destination address in userspace 467 * @src: source address on stack 468 * @len: number of bytes to copy 469 * Return: 0 on success or negative error 470 * 471 * int bpf_current_task_under_cgroup(map, index) 472 * Check cgroup2 membership of current task 473 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 474 * @index: index of the cgroup in the bpf_map 475 * Return: 476 * == 0 current failed the cgroup2 descendant test 477 * == 1 current succeeded the cgroup2 descendant test 478 * < 0 error 479 * 480 * int bpf_skb_change_tail(skb, len, flags) 481 * The helper will resize the skb to the given new size, to be used f.e. 482 * with control messages. 483 * @skb: pointer to skb 484 * @len: new skb length 485 * @flags: reserved 486 * Return: 0 on success or negative error 487 * 488 * int bpf_skb_pull_data(skb, len) 489 * The helper will pull in non-linear data in case the skb is non-linear 490 * and not all of len are part of the linear section. Only needed for 491 * read/write with direct packet access. 492 * @skb: pointer to skb 493 * @len: len to make read/writeable 494 * Return: 0 on success or negative error 495 * 496 * s64 bpf_csum_update(skb, csum) 497 * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. 498 * @skb: pointer to skb 499 * @csum: csum to add 500 * Return: csum on success or negative error 501 * 502 * void bpf_set_hash_invalid(skb) 503 * Invalidate current skb->hash. 504 * @skb: pointer to skb 505 * 506 * int bpf_get_numa_node_id() 507 * Return: Id of current NUMA node. 508 * 509 * int bpf_skb_change_head() 510 * Grows headroom of skb and adjusts MAC header offset accordingly. 511 * Will extends/reallocae as required automatically. 512 * May change skb data pointer and will thus invalidate any check 513 * performed for direct packet access. 514 * @skb: pointer to skb 515 * @len: length of header to be pushed in front 516 * @flags: Flags (unused for now) 517 * Return: 0 on success or negative error 518 * 519 * int bpf_xdp_adjust_head(xdp_md, delta) 520 * Adjust the xdp_md.data by delta 521 * @xdp_md: pointer to xdp_md 522 * @delta: An positive/negative integer to be added to xdp_md.data 523 * Return: 0 on success or negative on error 524 * 525 * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) 526 * Copy a NUL terminated string from unsafe address. In case the string 527 * length is smaller than size, the target is not padded with further NUL 528 * bytes. In case the string length is larger than size, just count-1 529 * bytes are copied and the last byte is set to NUL. 530 * @dst: destination address 531 * @size: maximum number of bytes to copy, including the trailing NUL 532 * @unsafe_ptr: unsafe address 533 * Return: 534 * > 0 length of the string including the trailing NUL on success 535 * < 0 error 536 * 537 * u64 bpf_get_socket_cookie(skb) 538 * Get the cookie for the socket stored inside sk_buff. 539 * @skb: pointer to skb 540 * Return: 8 Bytes non-decreasing number on success or 0 if the socket 541 * field is missing inside sk_buff 542 * 543 * u32 bpf_get_socket_uid(skb) 544 * Get the owner uid of the socket stored inside sk_buff. 545 * @skb: pointer to skb 546 * Return: uid of the socket owner on success or overflowuid if failed. 547 * 548 * u32 bpf_set_hash(skb, hash) 549 * Set full skb->hash. 550 * @skb: pointer to skb 551 * @hash: hash to set 552 * 553 * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen) 554 * Calls setsockopt. Not all opts are available, only those with 555 * integer optvals plus TCP_CONGESTION. 556 * Supported levels: SOL_SOCKET and IPROTO_TCP 557 * @bpf_socket: pointer to bpf_socket 558 * @level: SOL_SOCKET or IPROTO_TCP 559 * @optname: option name 560 * @optval: pointer to option value 561 * @optlen: length of optval in byes 562 * Return: 0 or negative error 563 * 564 * int bpf_skb_adjust_room(skb, len_diff, mode, flags) 565 * Grow or shrink room in sk_buff. 566 * @skb: pointer to skb 567 * @len_diff: (signed) amount of room to grow/shrink 568 * @mode: operation mode (enum bpf_adj_room_mode) 569 * @flags: reserved for future use 570 * Return: 0 on success or negative error code 571 * 572 * int bpf_sk_redirect_map(map, key, flags) 573 * Redirect skb to a sock in map using key as a lookup key for the 574 * sock in map. 575 * @map: pointer to sockmap 576 * @key: key to lookup sock in map 577 * @flags: reserved for future use 578 * Return: SK_REDIRECT 579 * 580 * int bpf_sock_map_update(skops, map, key, flags) 581 * @skops: pointer to bpf_sock_ops 582 * @map: pointer to sockmap to update 583 * @key: key to insert/update sock in map 584 * @flags: same flags as map update elem 585 */ 586 #define __BPF_FUNC_MAPPER(FN) \ 587 FN(unspec), \ 588 FN(map_lookup_elem), \ 589 FN(map_update_elem), \ 590 FN(map_delete_elem), \ 591 FN(probe_read), \ 592 FN(ktime_get_ns), \ 593 FN(trace_printk), \ 594 FN(get_prandom_u32), \ 595 FN(get_smp_processor_id), \ 596 FN(skb_store_bytes), \ 597 FN(l3_csum_replace), \ 598 FN(l4_csum_replace), \ 599 FN(tail_call), \ 600 FN(clone_redirect), \ 601 FN(get_current_pid_tgid), \ 602 FN(get_current_uid_gid), \ 603 FN(get_current_comm), \ 604 FN(get_cgroup_classid), \ 605 FN(skb_vlan_push), \ 606 FN(skb_vlan_pop), \ 607 FN(skb_get_tunnel_key), \ 608 FN(skb_set_tunnel_key), \ 609 FN(perf_event_read), \ 610 FN(redirect), \ 611 FN(get_route_realm), \ 612 FN(perf_event_output), \ 613 FN(skb_load_bytes), \ 614 FN(get_stackid), \ 615 FN(csum_diff), \ 616 FN(skb_get_tunnel_opt), \ 617 FN(skb_set_tunnel_opt), \ 618 FN(skb_change_proto), \ 619 FN(skb_change_type), \ 620 FN(skb_under_cgroup), \ 621 FN(get_hash_recalc), \ 622 FN(get_current_task), \ 623 FN(probe_write_user), \ 624 FN(current_task_under_cgroup), \ 625 FN(skb_change_tail), \ 626 FN(skb_pull_data), \ 627 FN(csum_update), \ 628 FN(set_hash_invalid), \ 629 FN(get_numa_node_id), \ 630 FN(skb_change_head), \ 631 FN(xdp_adjust_head), \ 632 FN(probe_read_str), \ 633 FN(get_socket_cookie), \ 634 FN(get_socket_uid), \ 635 FN(set_hash), \ 636 FN(setsockopt), \ 637 FN(skb_adjust_room), \ 638 FN(redirect_map), \ 639 FN(sk_redirect_map), \ 640 FN(sock_map_update), \ 641 642 /* integer value in 'imm' field of BPF_CALL instruction selects which helper 643 * function eBPF program intends to call 644 */ 645 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x 646 enum bpf_func_id { 647 __BPF_FUNC_MAPPER(__BPF_ENUM_FN) 648 __BPF_FUNC_MAX_ID, 649 }; 650 #undef __BPF_ENUM_FN 651 652 /* All flags used by eBPF helper functions, placed here. */ 653 654 /* BPF_FUNC_skb_store_bytes flags. */ 655 #define BPF_F_RECOMPUTE_CSUM (1ULL << 0) 656 #define BPF_F_INVALIDATE_HASH (1ULL << 1) 657 658 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. 659 * First 4 bits are for passing the header field size. 660 */ 661 #define BPF_F_HDR_FIELD_MASK 0xfULL 662 663 /* BPF_FUNC_l4_csum_replace flags. */ 664 #define BPF_F_PSEUDO_HDR (1ULL << 4) 665 #define BPF_F_MARK_MANGLED_0 (1ULL << 5) 666 #define BPF_F_MARK_ENFORCE (1ULL << 6) 667 668 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ 669 #define BPF_F_INGRESS (1ULL << 0) 670 671 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ 672 #define BPF_F_TUNINFO_IPV6 (1ULL << 0) 673 674 /* BPF_FUNC_get_stackid flags. */ 675 #define BPF_F_SKIP_FIELD_MASK 0xffULL 676 #define BPF_F_USER_STACK (1ULL << 8) 677 #define BPF_F_FAST_STACK_CMP (1ULL << 9) 678 #define BPF_F_REUSE_STACKID (1ULL << 10) 679 680 /* BPF_FUNC_skb_set_tunnel_key flags. */ 681 #define BPF_F_ZERO_CSUM_TX (1ULL << 1) 682 #define BPF_F_DONT_FRAGMENT (1ULL << 2) 683 684 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ 685 #define BPF_F_INDEX_MASK 0xffffffffULL 686 #define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK 687 /* BPF_FUNC_perf_event_output for sk_buff input context. */ 688 #define BPF_F_CTXLEN_MASK (0xfffffULL << 32) 689 690 /* Mode for BPF_FUNC_skb_adjust_room helper. */ 691 enum bpf_adj_room_mode { 692 BPF_ADJ_ROOM_NET, 693 }; 694 695 /* user accessible mirror of in-kernel sk_buff. 696 * new fields can only be added to the end of this structure 697 */ 698 struct __sk_buff { 699 __u32 len; 700 __u32 pkt_type; 701 __u32 mark; 702 __u32 queue_mapping; 703 __u32 protocol; 704 __u32 vlan_present; 705 __u32 vlan_tci; 706 __u32 vlan_proto; 707 __u32 priority; 708 __u32 ingress_ifindex; 709 __u32 ifindex; 710 __u32 tc_index; 711 __u32 cb[5]; 712 __u32 hash; 713 __u32 tc_classid; 714 __u32 data; 715 __u32 data_end; 716 __u32 napi_id; 717 718 /* accessed by BPF_PROG_TYPE_sk_skb types */ 719 __u32 family; 720 __u32 remote_ip4; /* Stored in network byte order */ 721 __u32 local_ip4; /* Stored in network byte order */ 722 __u32 remote_ip6[4]; /* Stored in network byte order */ 723 __u32 local_ip6[4]; /* Stored in network byte order */ 724 __u32 remote_port; /* Stored in network byte order */ 725 __u32 local_port; /* stored in host byte order */ 726 }; 727 728 struct bpf_tunnel_key { 729 __u32 tunnel_id; 730 union { 731 __u32 remote_ipv4; 732 __u32 remote_ipv6[4]; 733 }; 734 __u8 tunnel_tos; 735 __u8 tunnel_ttl; 736 __u16 tunnel_ext; 737 __u32 tunnel_label; 738 }; 739 740 /* Generic BPF return codes which all BPF program types may support. 741 * The values are binary compatible with their TC_ACT_* counter-part to 742 * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT 743 * programs. 744 * 745 * XDP is handled seprately, see XDP_*. 746 */ 747 enum bpf_ret_code { 748 BPF_OK = 0, 749 /* 1 reserved */ 750 BPF_DROP = 2, 751 /* 3-6 reserved */ 752 BPF_REDIRECT = 7, 753 /* >127 are reserved for prog type specific return codes */ 754 }; 755 756 struct bpf_sock { 757 __u32 bound_dev_if; 758 __u32 family; 759 __u32 type; 760 __u32 protocol; 761 __u32 mark; 762 __u32 priority; 763 }; 764 765 #define XDP_PACKET_HEADROOM 256 766 767 /* User return codes for XDP prog type. 768 * A valid XDP program must return one of these defined values. All other 769 * return codes are reserved for future use. Unknown return codes will 770 * result in packet drops and a warning via bpf_warn_invalid_xdp_action(). 771 */ 772 enum xdp_action { 773 XDP_ABORTED = 0, 774 XDP_DROP, 775 XDP_PASS, 776 XDP_TX, 777 XDP_REDIRECT, 778 }; 779 780 /* user accessible metadata for XDP packet hook 781 * new fields must be added to the end of this structure 782 */ 783 struct xdp_md { 784 __u32 data; 785 __u32 data_end; 786 }; 787 788 enum sk_action { 789 SK_ABORTED = 0, 790 SK_DROP, 791 SK_REDIRECT, 792 }; 793 794 #define BPF_TAG_SIZE 8 795 796 struct bpf_prog_info { 797 __u32 type; 798 __u32 id; 799 __u8 tag[BPF_TAG_SIZE]; 800 __u32 jited_prog_len; 801 __u32 xlated_prog_len; 802 __aligned_u64 jited_prog_insns; 803 __aligned_u64 xlated_prog_insns; 804 } __attribute__((aligned(8))); 805 806 struct bpf_map_info { 807 __u32 type; 808 __u32 id; 809 __u32 key_size; 810 __u32 value_size; 811 __u32 max_entries; 812 __u32 map_flags; 813 } __attribute__((aligned(8))); 814 815 /* User bpf_sock_ops struct to access socket values and specify request ops 816 * and their replies. 817 * Some of this fields are in network (bigendian) byte order and may need 818 * to be converted before use (bpf_ntohl() defined in samples/bpf/bpf_endian.h). 819 * New fields can only be added at the end of this structure 820 */ 821 struct bpf_sock_ops { 822 __u32 op; 823 union { 824 __u32 reply; 825 __u32 replylong[4]; 826 }; 827 __u32 family; 828 __u32 remote_ip4; /* Stored in network byte order */ 829 __u32 local_ip4; /* Stored in network byte order */ 830 __u32 remote_ip6[4]; /* Stored in network byte order */ 831 __u32 local_ip6[4]; /* Stored in network byte order */ 832 __u32 remote_port; /* Stored in network byte order */ 833 __u32 local_port; /* stored in host byte order */ 834 }; 835 836 /* List of known BPF sock_ops operators. 837 * New entries can only be added at the end 838 */ 839 enum { 840 BPF_SOCK_OPS_VOID, 841 BPF_SOCK_OPS_TIMEOUT_INIT, /* Should return SYN-RTO value to use or 842 * -1 if default value should be used 843 */ 844 BPF_SOCK_OPS_RWND_INIT, /* Should return initial advertized 845 * window (in packets) or -1 if default 846 * value should be used 847 */ 848 BPF_SOCK_OPS_TCP_CONNECT_CB, /* Calls BPF program right before an 849 * active connection is initialized 850 */ 851 BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB, /* Calls BPF program when an 852 * active connection is 853 * established 854 */ 855 BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB, /* Calls BPF program when a 856 * passive connection is 857 * established 858 */ 859 BPF_SOCK_OPS_NEEDS_ECN, /* If connection's congestion control 860 * needs ECN 861 */ 862 }; 863 864 #define TCP_BPF_IW 1001 /* Set TCP initial congestion window */ 865 #define TCP_BPF_SNDCWND_CLAMP 1002 /* Set sndcwnd_clamp */ 866 867 #endif /* _UAPI__LINUX_BPF_H__ */ 868