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