1 /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2 /* Copyright (c) 2011-2014 PLUMgrid, http://plumgrid.com 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of version 2 of the GNU General Public 6 * License as published by the Free Software Foundation. 7 */ 8 #ifndef __LINUX_BPF_H__ 9 #define __LINUX_BPF_H__ 10 11 #include <linux/types.h> 12 #include <linux/bpf_common.h> 13 14 /* Extended instruction set based on top of classic BPF */ 15 16 /* instruction classes */ 17 #define BPF_ALU64 0x07 /* alu mode in double word width */ 18 19 /* ld/ldx fields */ 20 #define BPF_DW 0x18 /* double word */ 21 #define BPF_XADD 0xc0 /* exclusive add */ 22 23 /* alu/jmp fields */ 24 #define BPF_MOV 0xb0 /* mov reg to reg */ 25 #define BPF_ARSH 0xc0 /* sign extending arithmetic shift right */ 26 27 /* change endianness of a register */ 28 #define BPF_END 0xd0 /* flags for endianness conversion: */ 29 #define BPF_TO_LE 0x00 /* convert to little-endian */ 30 #define BPF_TO_BE 0x08 /* convert to big-endian */ 31 #define BPF_FROM_LE BPF_TO_LE 32 #define BPF_FROM_BE BPF_TO_BE 33 34 /* jmp encodings */ 35 #define BPF_JNE 0x50 /* jump != */ 36 #define BPF_JLT 0xa0 /* LT is unsigned, '<' */ 37 #define BPF_JLE 0xb0 /* LE is unsigned, '<=' */ 38 #define BPF_JSGT 0x60 /* SGT is signed '>', GT in x86 */ 39 #define BPF_JSGE 0x70 /* SGE is signed '>=', GE in x86 */ 40 #define BPF_JSLT 0xc0 /* SLT is signed, '<' */ 41 #define BPF_JSLE 0xd0 /* SLE is signed, '<=' */ 42 #define BPF_CALL 0x80 /* function call */ 43 #define BPF_EXIT 0x90 /* function return */ 44 45 /* Register numbers */ 46 enum { 47 BPF_REG_0 = 0, 48 BPF_REG_1, 49 BPF_REG_2, 50 BPF_REG_3, 51 BPF_REG_4, 52 BPF_REG_5, 53 BPF_REG_6, 54 BPF_REG_7, 55 BPF_REG_8, 56 BPF_REG_9, 57 BPF_REG_10, 58 __MAX_BPF_REG, 59 }; 60 61 /* BPF has 10 general purpose 64-bit registers and stack frame. */ 62 #define MAX_BPF_REG __MAX_BPF_REG 63 64 struct bpf_insn { 65 __u8 code; /* opcode */ 66 __u8 dst_reg:4; /* dest register */ 67 __u8 src_reg:4; /* source register */ 68 __s16 off; /* signed offset */ 69 __s32 imm; /* signed immediate constant */ 70 }; 71 72 /* Key of an a BPF_MAP_TYPE_LPM_TRIE entry */ 73 struct bpf_lpm_trie_key { 74 __u32 prefixlen; /* up to 32 for AF_INET, 128 for AF_INET6 */ 75 __u8 data[0]; /* Arbitrary size */ 76 }; 77 78 /* BPF syscall commands, see bpf(2) man-page for details. */ 79 enum bpf_cmd { 80 BPF_MAP_CREATE, 81 BPF_MAP_LOOKUP_ELEM, 82 BPF_MAP_UPDATE_ELEM, 83 BPF_MAP_DELETE_ELEM, 84 BPF_MAP_GET_NEXT_KEY, 85 BPF_PROG_LOAD, 86 BPF_OBJ_PIN, 87 BPF_OBJ_GET, 88 BPF_PROG_ATTACH, 89 BPF_PROG_DETACH, 90 BPF_PROG_TEST_RUN, 91 BPF_PROG_GET_NEXT_ID, 92 BPF_MAP_GET_NEXT_ID, 93 BPF_PROG_GET_FD_BY_ID, 94 BPF_MAP_GET_FD_BY_ID, 95 BPF_OBJ_GET_INFO_BY_FD, 96 }; 97 98 enum bpf_map_type { 99 BPF_MAP_TYPE_UNSPEC, 100 BPF_MAP_TYPE_HASH, 101 BPF_MAP_TYPE_ARRAY, 102 BPF_MAP_TYPE_PROG_ARRAY, 103 BPF_MAP_TYPE_PERF_EVENT_ARRAY, 104 BPF_MAP_TYPE_PERCPU_HASH, 105 BPF_MAP_TYPE_PERCPU_ARRAY, 106 BPF_MAP_TYPE_STACK_TRACE, 107 BPF_MAP_TYPE_CGROUP_ARRAY, 108 BPF_MAP_TYPE_LRU_HASH, 109 BPF_MAP_TYPE_LRU_PERCPU_HASH, 110 BPF_MAP_TYPE_LPM_TRIE, 111 BPF_MAP_TYPE_ARRAY_OF_MAPS, 112 BPF_MAP_TYPE_HASH_OF_MAPS, 113 BPF_MAP_TYPE_DEVMAP, 114 BPF_MAP_TYPE_SOCKMAP, 115 }; 116 117 enum bpf_prog_type { 118 BPF_PROG_TYPE_UNSPEC, 119 BPF_PROG_TYPE_SOCKET_FILTER, 120 BPF_PROG_TYPE_KPROBE, 121 BPF_PROG_TYPE_SCHED_CLS, 122 BPF_PROG_TYPE_SCHED_ACT, 123 BPF_PROG_TYPE_TRACEPOINT, 124 BPF_PROG_TYPE_XDP, 125 BPF_PROG_TYPE_PERF_EVENT, 126 BPF_PROG_TYPE_CGROUP_SKB, 127 BPF_PROG_TYPE_CGROUP_SOCK, 128 BPF_PROG_TYPE_LWT_IN, 129 BPF_PROG_TYPE_LWT_OUT, 130 BPF_PROG_TYPE_LWT_XMIT, 131 BPF_PROG_TYPE_SOCK_OPS, 132 BPF_PROG_TYPE_SK_SKB, 133 }; 134 135 enum bpf_attach_type { 136 BPF_CGROUP_INET_INGRESS, 137 BPF_CGROUP_INET_EGRESS, 138 BPF_CGROUP_INET_SOCK_CREATE, 139 BPF_CGROUP_SOCK_OPS, 140 BPF_SK_SKB_STREAM_PARSER, 141 BPF_SK_SKB_STREAM_VERDICT, 142 __MAX_BPF_ATTACH_TYPE 143 }; 144 145 #define MAX_BPF_ATTACH_TYPE __MAX_BPF_ATTACH_TYPE 146 147 /* If BPF_F_ALLOW_OVERRIDE flag is used in BPF_PROG_ATTACH command 148 * to the given target_fd cgroup the descendent cgroup will be able to 149 * override effective bpf program that was inherited from this cgroup 150 */ 151 #define BPF_F_ALLOW_OVERRIDE (1U << 0) 152 153 /* If BPF_F_STRICT_ALIGNMENT is used in BPF_PROG_LOAD command, the 154 * verifier will perform strict alignment checking as if the kernel 155 * has been built with CONFIG_EFFICIENT_UNALIGNED_ACCESS not set, 156 * and NET_IP_ALIGN defined to 2. 157 */ 158 #define BPF_F_STRICT_ALIGNMENT (1U << 0) 159 160 #define BPF_PSEUDO_MAP_FD 1 161 162 /* flags for BPF_MAP_UPDATE_ELEM command */ 163 #define BPF_ANY 0 /* create new element or update existing */ 164 #define BPF_NOEXIST 1 /* create new element if it didn't exist */ 165 #define BPF_EXIST 2 /* update existing element */ 166 167 /* flags for BPF_MAP_CREATE command */ 168 #define BPF_F_NO_PREALLOC (1U << 0) 169 /* Instead of having one common LRU list in the 170 * BPF_MAP_TYPE_LRU_[PERCPU_]HASH map, use a percpu LRU list 171 * which can scale and perform better. 172 * Note, the LRU nodes (including free nodes) cannot be moved 173 * across different LRU lists. 174 */ 175 #define BPF_F_NO_COMMON_LRU (1U << 1) 176 /* Specify numa node during map creation */ 177 #define BPF_F_NUMA_NODE (1U << 2) 178 179 union bpf_attr { 180 struct { /* anonymous struct used by BPF_MAP_CREATE command */ 181 __u32 map_type; /* one of enum bpf_map_type */ 182 __u32 key_size; /* size of key in bytes */ 183 __u32 value_size; /* size of value in bytes */ 184 __u32 max_entries; /* max number of entries in a map */ 185 __u32 map_flags; /* BPF_MAP_CREATE related 186 * flags defined above. 187 */ 188 __u32 inner_map_fd; /* fd pointing to the inner map */ 189 __u32 numa_node; /* numa node (effective only if 190 * BPF_F_NUMA_NODE is set). 191 */ 192 }; 193 194 struct { /* anonymous struct used by BPF_MAP_*_ELEM commands */ 195 __u32 map_fd; 196 __aligned_u64 key; 197 union { 198 __aligned_u64 value; 199 __aligned_u64 next_key; 200 }; 201 __u64 flags; 202 }; 203 204 struct { /* anonymous struct used by BPF_PROG_LOAD command */ 205 __u32 prog_type; /* one of enum bpf_prog_type */ 206 __u32 insn_cnt; 207 __aligned_u64 insns; 208 __aligned_u64 license; 209 __u32 log_level; /* verbosity level of verifier */ 210 __u32 log_size; /* size of user buffer */ 211 __aligned_u64 log_buf; /* user supplied buffer */ 212 __u32 kern_version; /* checked when prog_type=kprobe */ 213 __u32 prog_flags; 214 }; 215 216 struct { /* anonymous struct used by BPF_OBJ_* commands */ 217 __aligned_u64 pathname; 218 __u32 bpf_fd; 219 }; 220 221 struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */ 222 __u32 target_fd; /* container object to attach to */ 223 __u32 attach_bpf_fd; /* eBPF program to attach */ 224 __u32 attach_type; 225 __u32 attach_flags; 226 }; 227 228 struct { /* anonymous struct used by BPF_PROG_TEST_RUN command */ 229 __u32 prog_fd; 230 __u32 retval; 231 __u32 data_size_in; 232 __u32 data_size_out; 233 __aligned_u64 data_in; 234 __aligned_u64 data_out; 235 __u32 repeat; 236 __u32 duration; 237 } test; 238 239 struct { /* anonymous struct used by BPF_*_GET_*_ID */ 240 union { 241 __u32 start_id; 242 __u32 prog_id; 243 __u32 map_id; 244 }; 245 __u32 next_id; 246 }; 247 248 struct { /* anonymous struct used by BPF_OBJ_GET_INFO_BY_FD */ 249 __u32 bpf_fd; 250 __u32 info_len; 251 __aligned_u64 info; 252 } info; 253 } __attribute__((aligned(8))); 254 255 /* BPF helper function descriptions: 256 * 257 * void *bpf_map_lookup_elem(&map, &key) 258 * Return: Map value or NULL 259 * 260 * int bpf_map_update_elem(&map, &key, &value, flags) 261 * Return: 0 on success or negative error 262 * 263 * int bpf_map_delete_elem(&map, &key) 264 * Return: 0 on success or negative error 265 * 266 * int bpf_probe_read(void *dst, int size, void *src) 267 * Return: 0 on success or negative error 268 * 269 * u64 bpf_ktime_get_ns(void) 270 * Return: current ktime 271 * 272 * int bpf_trace_printk(const char *fmt, int fmt_size, ...) 273 * Return: length of buffer written or negative error 274 * 275 * u32 bpf_prandom_u32(void) 276 * Return: random value 277 * 278 * u32 bpf_raw_smp_processor_id(void) 279 * Return: SMP processor ID 280 * 281 * int bpf_skb_store_bytes(skb, offset, from, len, flags) 282 * store bytes into packet 283 * @skb: pointer to skb 284 * @offset: offset within packet from skb->mac_header 285 * @from: pointer where to copy bytes from 286 * @len: number of bytes to store into packet 287 * @flags: bit 0 - if true, recompute skb->csum 288 * other bits - reserved 289 * Return: 0 on success or negative error 290 * 291 * int bpf_l3_csum_replace(skb, offset, from, to, flags) 292 * recompute IP checksum 293 * @skb: pointer to skb 294 * @offset: offset within packet where IP checksum is located 295 * @from: old value of header field 296 * @to: new value of header field 297 * @flags: bits 0-3 - size of header field 298 * other bits - reserved 299 * Return: 0 on success or negative error 300 * 301 * int bpf_l4_csum_replace(skb, offset, from, to, flags) 302 * recompute TCP/UDP checksum 303 * @skb: pointer to skb 304 * @offset: offset within packet where TCP/UDP checksum is located 305 * @from: old value of header field 306 * @to: new value of header field 307 * @flags: bits 0-3 - size of header field 308 * bit 4 - is pseudo header 309 * other bits - reserved 310 * Return: 0 on success or negative error 311 * 312 * int bpf_tail_call(ctx, prog_array_map, index) 313 * jump into another BPF program 314 * @ctx: context pointer passed to next program 315 * @prog_array_map: pointer to map which type is BPF_MAP_TYPE_PROG_ARRAY 316 * @index: 32-bit index inside array that selects specific program to run 317 * Return: 0 on success or negative error 318 * 319 * int bpf_clone_redirect(skb, ifindex, flags) 320 * redirect to another netdev 321 * @skb: pointer to skb 322 * @ifindex: ifindex of the net device 323 * @flags: bit 0 - if set, redirect to ingress instead of egress 324 * other bits - reserved 325 * Return: 0 on success or negative error 326 * 327 * u64 bpf_get_current_pid_tgid(void) 328 * Return: current->tgid << 32 | current->pid 329 * 330 * u64 bpf_get_current_uid_gid(void) 331 * Return: current_gid << 32 | current_uid 332 * 333 * int bpf_get_current_comm(char *buf, int size_of_buf) 334 * stores current->comm into buf 335 * Return: 0 on success or negative error 336 * 337 * u32 bpf_get_cgroup_classid(skb) 338 * retrieve a proc's classid 339 * @skb: pointer to skb 340 * Return: classid if != 0 341 * 342 * int bpf_skb_vlan_push(skb, vlan_proto, vlan_tci) 343 * Return: 0 on success or negative error 344 * 345 * int bpf_skb_vlan_pop(skb) 346 * Return: 0 on success or negative error 347 * 348 * int bpf_skb_get_tunnel_key(skb, key, size, flags) 349 * int bpf_skb_set_tunnel_key(skb, key, size, flags) 350 * retrieve or populate tunnel metadata 351 * @skb: pointer to skb 352 * @key: pointer to 'struct bpf_tunnel_key' 353 * @size: size of 'struct bpf_tunnel_key' 354 * @flags: room for future extensions 355 * Return: 0 on success or negative error 356 * 357 * u64 bpf_perf_event_read(map, flags) 358 * read perf event counter value 359 * @map: pointer to perf_event_array map 360 * @flags: index of event in the map or bitmask flags 361 * Return: value of perf event counter read or error code 362 * 363 * int bpf_redirect(ifindex, flags) 364 * redirect to another netdev 365 * @ifindex: ifindex of the net device 366 * @flags: 367 * cls_bpf: 368 * bit 0 - if set, redirect to ingress instead of egress 369 * other bits - reserved 370 * xdp_bpf: 371 * all bits - reserved 372 * Return: cls_bpf: TC_ACT_REDIRECT on success or TC_ACT_SHOT on error 373 * xdp_bfp: XDP_REDIRECT on success or XDP_ABORT on error 374 * int bpf_redirect_map(map, key, flags) 375 * redirect to endpoint in map 376 * @map: pointer to dev map 377 * @key: index in map to lookup 378 * @flags: -- 379 * Return: XDP_REDIRECT on success or XDP_ABORT on error 380 * 381 * u32 bpf_get_route_realm(skb) 382 * retrieve a dst's tclassid 383 * @skb: pointer to skb 384 * Return: realm if != 0 385 * 386 * int bpf_perf_event_output(ctx, map, flags, data, size) 387 * output perf raw sample 388 * @ctx: struct pt_regs* 389 * @map: pointer to perf_event_array map 390 * @flags: index of event in the map or bitmask flags 391 * @data: data on stack to be output as raw data 392 * @size: size of data 393 * Return: 0 on success or negative error 394 * 395 * int bpf_get_stackid(ctx, map, flags) 396 * walk user or kernel stack and return id 397 * @ctx: struct pt_regs* 398 * @map: pointer to stack_trace map 399 * @flags: bits 0-7 - numer of stack frames to skip 400 * bit 8 - collect user stack instead of kernel 401 * bit 9 - compare stacks by hash only 402 * bit 10 - if two different stacks hash into the same stackid 403 * discard old 404 * other bits - reserved 405 * Return: >= 0 stackid on success or negative error 406 * 407 * s64 bpf_csum_diff(from, from_size, to, to_size, seed) 408 * calculate csum diff 409 * @from: raw from buffer 410 * @from_size: length of from buffer 411 * @to: raw to buffer 412 * @to_size: length of to buffer 413 * @seed: optional seed 414 * Return: csum result or negative error code 415 * 416 * int bpf_skb_get_tunnel_opt(skb, opt, size) 417 * retrieve tunnel options metadata 418 * @skb: pointer to skb 419 * @opt: pointer to raw tunnel option data 420 * @size: size of @opt 421 * Return: option size 422 * 423 * int bpf_skb_set_tunnel_opt(skb, opt, size) 424 * populate tunnel options metadata 425 * @skb: pointer to skb 426 * @opt: pointer to raw tunnel option data 427 * @size: size of @opt 428 * Return: 0 on success or negative error 429 * 430 * int bpf_skb_change_proto(skb, proto, flags) 431 * Change protocol of the skb. Currently supported is v4 -> v6, 432 * v6 -> v4 transitions. The helper will also resize the skb. eBPF 433 * program is expected to fill the new headers via skb_store_bytes 434 * and lX_csum_replace. 435 * @skb: pointer to skb 436 * @proto: new skb->protocol type 437 * @flags: reserved 438 * Return: 0 on success or negative error 439 * 440 * int bpf_skb_change_type(skb, type) 441 * Change packet type of skb. 442 * @skb: pointer to skb 443 * @type: new skb->pkt_type type 444 * Return: 0 on success or negative error 445 * 446 * int bpf_skb_under_cgroup(skb, map, index) 447 * Check cgroup2 membership of skb 448 * @skb: pointer to skb 449 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 450 * @index: index of the cgroup in the bpf_map 451 * Return: 452 * == 0 skb failed the cgroup2 descendant test 453 * == 1 skb succeeded the cgroup2 descendant test 454 * < 0 error 455 * 456 * u32 bpf_get_hash_recalc(skb) 457 * Retrieve and possibly recalculate skb->hash. 458 * @skb: pointer to skb 459 * Return: hash 460 * 461 * u64 bpf_get_current_task(void) 462 * Returns current task_struct 463 * Return: current 464 * 465 * int bpf_probe_write_user(void *dst, void *src, int len) 466 * safely attempt to write to a location 467 * @dst: destination address in userspace 468 * @src: source address on stack 469 * @len: number of bytes to copy 470 * Return: 0 on success or negative error 471 * 472 * int bpf_current_task_under_cgroup(map, index) 473 * Check cgroup2 membership of current task 474 * @map: pointer to bpf_map in BPF_MAP_TYPE_CGROUP_ARRAY type 475 * @index: index of the cgroup in the bpf_map 476 * Return: 477 * == 0 current failed the cgroup2 descendant test 478 * == 1 current succeeded the cgroup2 descendant test 479 * < 0 error 480 * 481 * int bpf_skb_change_tail(skb, len, flags) 482 * The helper will resize the skb to the given new size, to be used f.e. 483 * with control messages. 484 * @skb: pointer to skb 485 * @len: new skb length 486 * @flags: reserved 487 * Return: 0 on success or negative error 488 * 489 * int bpf_skb_pull_data(skb, len) 490 * The helper will pull in non-linear data in case the skb is non-linear 491 * and not all of len are part of the linear section. Only needed for 492 * read/write with direct packet access. 493 * @skb: pointer to skb 494 * @len: len to make read/writeable 495 * Return: 0 on success or negative error 496 * 497 * s64 bpf_csum_update(skb, csum) 498 * Adds csum into skb->csum in case of CHECKSUM_COMPLETE. 499 * @skb: pointer to skb 500 * @csum: csum to add 501 * Return: csum on success or negative error 502 * 503 * void bpf_set_hash_invalid(skb) 504 * Invalidate current skb->hash. 505 * @skb: pointer to skb 506 * 507 * int bpf_get_numa_node_id() 508 * Return: Id of current NUMA node. 509 * 510 * int bpf_skb_change_head() 511 * Grows headroom of skb and adjusts MAC header offset accordingly. 512 * Will extends/reallocae as required automatically. 513 * May change skb data pointer and will thus invalidate any check 514 * performed for direct packet access. 515 * @skb: pointer to skb 516 * @len: length of header to be pushed in front 517 * @flags: Flags (unused for now) 518 * Return: 0 on success or negative error 519 * 520 * int bpf_xdp_adjust_head(xdp_md, delta) 521 * Adjust the xdp_md.data by delta 522 * @xdp_md: pointer to xdp_md 523 * @delta: An positive/negative integer to be added to xdp_md.data 524 * Return: 0 on success or negative on error 525 * 526 * int bpf_probe_read_str(void *dst, int size, const void *unsafe_ptr) 527 * Copy a NUL terminated string from unsafe address. In case the string 528 * length is smaller than size, the target is not padded with further NUL 529 * bytes. In case the string length is larger than size, just count-1 530 * bytes are copied and the last byte is set to NUL. 531 * @dst: destination address 532 * @size: maximum number of bytes to copy, including the trailing NUL 533 * @unsafe_ptr: unsafe address 534 * Return: 535 * > 0 length of the string including the trailing NUL on success 536 * < 0 error 537 * 538 * u64 bpf_get_socket_cookie(skb) 539 * Get the cookie for the socket stored inside sk_buff. 540 * @skb: pointer to skb 541 * Return: 8 Bytes non-decreasing number on success or 0 if the socket 542 * field is missing inside sk_buff 543 * 544 * u32 bpf_get_socket_uid(skb) 545 * Get the owner uid of the socket stored inside sk_buff. 546 * @skb: pointer to skb 547 * Return: uid of the socket owner on success or overflowuid if failed. 548 * 549 * u32 bpf_set_hash(skb, hash) 550 * Set full skb->hash. 551 * @skb: pointer to skb 552 * @hash: hash to set 553 * 554 * int bpf_setsockopt(bpf_socket, level, optname, optval, optlen) 555 * Calls setsockopt. Not all opts are available, only those with 556 * integer optvals plus TCP_CONGESTION. 557 * Supported levels: SOL_SOCKET and IPROTO_TCP 558 * @bpf_socket: pointer to bpf_socket 559 * @level: SOL_SOCKET or IPROTO_TCP 560 * @optname: option name 561 * @optval: pointer to option value 562 * @optlen: length of optval in byes 563 * Return: 0 or negative error 564 * 565 * int bpf_skb_adjust_room(skb, len_diff, mode, flags) 566 * Grow or shrink room in sk_buff. 567 * @skb: pointer to skb 568 * @len_diff: (signed) amount of room to grow/shrink 569 * @mode: operation mode (enum bpf_adj_room_mode) 570 * @flags: reserved for future use 571 * Return: 0 on success or negative error code 572 * 573 * int bpf_sk_redirect_map(map, key, flags) 574 * Redirect skb to a sock in map using key as a lookup key for the 575 * sock in map. 576 * @map: pointer to sockmap 577 * @key: key to lookup sock in map 578 * @flags: reserved for future use 579 * Return: SK_PASS 580 * 581 * int bpf_sock_map_update(skops, map, key, flags) 582 * @skops: pointer to bpf_sock_ops 583 * @map: pointer to sockmap to update 584 * @key: key to insert/update sock in map 585 * @flags: same flags as map update elem 586 */ 587 #define __BPF_FUNC_MAPPER(FN) \ 588 FN(unspec), \ 589 FN(map_lookup_elem), \ 590 FN(map_update_elem), \ 591 FN(map_delete_elem), \ 592 FN(probe_read), \ 593 FN(ktime_get_ns), \ 594 FN(trace_printk), \ 595 FN(get_prandom_u32), \ 596 FN(get_smp_processor_id), \ 597 FN(skb_store_bytes), \ 598 FN(l3_csum_replace), \ 599 FN(l4_csum_replace), \ 600 FN(tail_call), \ 601 FN(clone_redirect), \ 602 FN(get_current_pid_tgid), \ 603 FN(get_current_uid_gid), \ 604 FN(get_current_comm), \ 605 FN(get_cgroup_classid), \ 606 FN(skb_vlan_push), \ 607 FN(skb_vlan_pop), \ 608 FN(skb_get_tunnel_key), \ 609 FN(skb_set_tunnel_key), \ 610 FN(perf_event_read), \ 611 FN(redirect), \ 612 FN(get_route_realm), \ 613 FN(perf_event_output), \ 614 FN(skb_load_bytes), \ 615 FN(get_stackid), \ 616 FN(csum_diff), \ 617 FN(skb_get_tunnel_opt), \ 618 FN(skb_set_tunnel_opt), \ 619 FN(skb_change_proto), \ 620 FN(skb_change_type), \ 621 FN(skb_under_cgroup), \ 622 FN(get_hash_recalc), \ 623 FN(get_current_task), \ 624 FN(probe_write_user), \ 625 FN(current_task_under_cgroup), \ 626 FN(skb_change_tail), \ 627 FN(skb_pull_data), \ 628 FN(csum_update), \ 629 FN(set_hash_invalid), \ 630 FN(get_numa_node_id), \ 631 FN(skb_change_head), \ 632 FN(xdp_adjust_head), \ 633 FN(probe_read_str), \ 634 FN(get_socket_cookie), \ 635 FN(get_socket_uid), \ 636 FN(set_hash), \ 637 FN(setsockopt), \ 638 FN(skb_adjust_room), \ 639 FN(redirect_map), \ 640 FN(sk_redirect_map), \ 641 FN(sock_map_update), \ 642 643 /* integer value in 'imm' field of BPF_CALL instruction selects which helper 644 * function eBPF program intends to call 645 */ 646 #define __BPF_ENUM_FN(x) BPF_FUNC_ ## x 647 enum bpf_func_id { 648 __BPF_FUNC_MAPPER(__BPF_ENUM_FN) 649 __BPF_FUNC_MAX_ID, 650 }; 651 #undef __BPF_ENUM_FN 652 653 /* All flags used by eBPF helper functions, placed here. */ 654 655 /* BPF_FUNC_skb_store_bytes flags. */ 656 #define BPF_F_RECOMPUTE_CSUM (1ULL << 0) 657 #define BPF_F_INVALIDATE_HASH (1ULL << 1) 658 659 /* BPF_FUNC_l3_csum_replace and BPF_FUNC_l4_csum_replace flags. 660 * First 4 bits are for passing the header field size. 661 */ 662 #define BPF_F_HDR_FIELD_MASK 0xfULL 663 664 /* BPF_FUNC_l4_csum_replace flags. */ 665 #define BPF_F_PSEUDO_HDR (1ULL << 4) 666 #define BPF_F_MARK_MANGLED_0 (1ULL << 5) 667 #define BPF_F_MARK_ENFORCE (1ULL << 6) 668 669 /* BPF_FUNC_clone_redirect and BPF_FUNC_redirect flags. */ 670 #define BPF_F_INGRESS (1ULL << 0) 671 672 /* BPF_FUNC_skb_set_tunnel_key and BPF_FUNC_skb_get_tunnel_key flags. */ 673 #define BPF_F_TUNINFO_IPV6 (1ULL << 0) 674 675 /* BPF_FUNC_get_stackid flags. */ 676 #define BPF_F_SKIP_FIELD_MASK 0xffULL 677 #define BPF_F_USER_STACK (1ULL << 8) 678 #define BPF_F_FAST_STACK_CMP (1ULL << 9) 679 #define BPF_F_REUSE_STACKID (1ULL << 10) 680 681 /* BPF_FUNC_skb_set_tunnel_key flags. */ 682 #define BPF_F_ZERO_CSUM_TX (1ULL << 1) 683 #define BPF_F_DONT_FRAGMENT (1ULL << 2) 684 685 /* BPF_FUNC_perf_event_output and BPF_FUNC_perf_event_read flags. */ 686 #define BPF_F_INDEX_MASK 0xffffffffULL 687 #define BPF_F_CURRENT_CPU BPF_F_INDEX_MASK 688 /* BPF_FUNC_perf_event_output for sk_buff input context. */ 689 #define BPF_F_CTXLEN_MASK (0xfffffULL << 32) 690 691 /* Mode for BPF_FUNC_skb_adjust_room helper. */ 692 enum bpf_adj_room_mode { 693 BPF_ADJ_ROOM_NET, 694 }; 695 696 /* user accessible mirror of in-kernel sk_buff. 697 * new fields can only be added to the end of this structure 698 */ 699 struct __sk_buff { 700 __u32 len; 701 __u32 pkt_type; 702 __u32 mark; 703 __u32 queue_mapping; 704 __u32 protocol; 705 __u32 vlan_present; 706 __u32 vlan_tci; 707 __u32 vlan_proto; 708 __u32 priority; 709 __u32 ingress_ifindex; 710 __u32 ifindex; 711 __u32 tc_index; 712 __u32 cb[5]; 713 __u32 hash; 714 __u32 tc_classid; 715 __u32 data; 716 __u32 data_end; 717 __u32 napi_id; 718 719 /* accessed by BPF_PROG_TYPE_sk_skb types */ 720 __u32 family; 721 __u32 remote_ip4; /* Stored in network byte order */ 722 __u32 local_ip4; /* Stored in network byte order */ 723 __u32 remote_ip6[4]; /* Stored in network byte order */ 724 __u32 local_ip6[4]; /* Stored in network byte order */ 725 __u32 remote_port; /* Stored in network byte order */ 726 __u32 local_port; /* stored in host byte order */ 727 }; 728 729 struct bpf_tunnel_key { 730 __u32 tunnel_id; 731 union { 732 __u32 remote_ipv4; 733 __u32 remote_ipv6[4]; 734 }; 735 __u8 tunnel_tos; 736 __u8 tunnel_ttl; 737 __u16 tunnel_ext; 738 __u32 tunnel_label; 739 }; 740 741 /* Generic BPF return codes which all BPF program types may support. 742 * The values are binary compatible with their TC_ACT_* counter-part to 743 * provide backwards compatibility with existing SCHED_CLS and SCHED_ACT 744 * programs. 745 * 746 * XDP is handled seprately, see XDP_*. 747 */ 748 enum bpf_ret_code { 749 BPF_OK = 0, 750 /* 1 reserved */ 751 BPF_DROP = 2, 752 /* 3-6 reserved */ 753 BPF_REDIRECT = 7, 754 /* >127 are reserved for prog type specific return codes */ 755 }; 756 757 struct bpf_sock { 758 __u32 bound_dev_if; 759 __u32 family; 760 __u32 type; 761 __u32 protocol; 762 __u32 mark; 763 __u32 priority; 764 }; 765 766 #define XDP_PACKET_HEADROOM 256 767 768 /* User return codes for XDP prog type. 769 * A valid XDP program must return one of these defined values. All other 770 * return codes are reserved for future use. Unknown return codes will 771 * result in packet drops and a warning via bpf_warn_invalid_xdp_action(). 772 */ 773 enum xdp_action { 774 XDP_ABORTED = 0, 775 XDP_DROP, 776 XDP_PASS, 777 XDP_TX, 778 XDP_REDIRECT, 779 }; 780 781 /* user accessible metadata for XDP packet hook 782 * new fields must be added to the end of this structure 783 */ 784 struct xdp_md { 785 __u32 data; 786 __u32 data_end; 787 }; 788 789 enum sk_action { 790 SK_DROP = 0, 791 SK_PASS, 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 /* __LINUX_BPF_H__ */ 868