1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) 2 3 /* 4 * common eBPF ELF operations. 5 * 6 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org> 7 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com> 8 * Copyright (C) 2015 Huawei Inc. 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU Lesser General Public 12 * License as published by the Free Software Foundation; 13 * version 2.1 of the License (not later!) 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU Lesser General Public License for more details. 19 * 20 * You should have received a copy of the GNU Lesser General Public 21 * License along with this program; if not, see <http://www.gnu.org/licenses> 22 */ 23 24 #include <stdlib.h> 25 #include <string.h> 26 #include <memory.h> 27 #include <unistd.h> 28 #include <asm/unistd.h> 29 #include <errno.h> 30 #include <linux/bpf.h> 31 #include <linux/filter.h> 32 #include <linux/kernel.h> 33 #include <limits.h> 34 #include <sys/resource.h> 35 #include "bpf.h" 36 #include "libbpf.h" 37 #include "libbpf_internal.h" 38 39 /* 40 * When building perf, unistd.h is overridden. __NR_bpf is 41 * required to be defined explicitly. 42 */ 43 #ifndef __NR_bpf 44 # if defined(__i386__) 45 # define __NR_bpf 357 46 # elif defined(__x86_64__) 47 # define __NR_bpf 321 48 # elif defined(__aarch64__) 49 # define __NR_bpf 280 50 # elif defined(__sparc__) 51 # define __NR_bpf 349 52 # elif defined(__s390__) 53 # define __NR_bpf 351 54 # elif defined(__arc__) 55 # define __NR_bpf 280 56 # elif defined(__mips__) && defined(_ABIO32) 57 # define __NR_bpf 4355 58 # elif defined(__mips__) && defined(_ABIN32) 59 # define __NR_bpf 6319 60 # elif defined(__mips__) && defined(_ABI64) 61 # define __NR_bpf 5315 62 # else 63 # error __NR_bpf not defined. libbpf does not support your arch. 64 # endif 65 #endif 66 67 static inline __u64 ptr_to_u64(const void *ptr) 68 { 69 return (__u64) (unsigned long) ptr; 70 } 71 72 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, 73 unsigned int size) 74 { 75 return syscall(__NR_bpf, cmd, attr, size); 76 } 77 78 static inline int sys_bpf_fd(enum bpf_cmd cmd, union bpf_attr *attr, 79 unsigned int size) 80 { 81 int fd; 82 83 fd = sys_bpf(cmd, attr, size); 84 return ensure_good_fd(fd); 85 } 86 87 int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts) 88 { 89 int fd; 90 91 do { 92 fd = sys_bpf_fd(BPF_PROG_LOAD, attr, size); 93 } while (fd < 0 && errno == EAGAIN && --attempts > 0); 94 95 return fd; 96 } 97 98 /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to 99 * memcg-based memory accounting for BPF maps and progs. This was done in [0]. 100 * We use the support for bpf_ktime_get_coarse_ns() helper, which was added in 101 * the same 5.11 Linux release ([1]), to detect memcg-based accounting for BPF. 102 * 103 * [0] https://lore.kernel.org/bpf/20201201215900.3569844-1-guro@fb.com/ 104 * [1] d05512618056 ("bpf: Add bpf_ktime_get_coarse_ns helper") 105 */ 106 int probe_memcg_account(int token_fd) 107 { 108 const size_t attr_sz = offsetofend(union bpf_attr, prog_token_fd); 109 struct bpf_insn insns[] = { 110 BPF_EMIT_CALL(BPF_FUNC_ktime_get_coarse_ns), 111 BPF_EXIT_INSN(), 112 }; 113 size_t insn_cnt = ARRAY_SIZE(insns); 114 union bpf_attr attr; 115 int prog_fd; 116 117 /* attempt loading freplace trying to use custom BTF */ 118 memset(&attr, 0, attr_sz); 119 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER; 120 attr.insns = ptr_to_u64(insns); 121 attr.insn_cnt = insn_cnt; 122 attr.license = ptr_to_u64("GPL"); 123 attr.prog_token_fd = token_fd; 124 if (token_fd) 125 attr.prog_flags |= BPF_F_TOKEN_FD; 126 127 prog_fd = sys_bpf_fd(BPF_PROG_LOAD, &attr, attr_sz); 128 if (prog_fd >= 0) { 129 close(prog_fd); 130 return 1; 131 } 132 return 0; 133 } 134 135 static bool memlock_bumped; 136 static rlim_t memlock_rlim = RLIM_INFINITY; 137 138 int libbpf_set_memlock_rlim(size_t memlock_bytes) 139 { 140 if (memlock_bumped) 141 return libbpf_err(-EBUSY); 142 143 memlock_rlim = memlock_bytes; 144 return 0; 145 } 146 147 int bump_rlimit_memlock(void) 148 { 149 struct rlimit rlim; 150 151 /* if kernel supports memcg-based accounting, skip bumping RLIMIT_MEMLOCK */ 152 if (memlock_bumped || feat_supported(NULL, FEAT_MEMCG_ACCOUNT)) 153 return 0; 154 155 memlock_bumped = true; 156 157 /* zero memlock_rlim_max disables auto-bumping RLIMIT_MEMLOCK */ 158 if (memlock_rlim == 0) 159 return 0; 160 161 rlim.rlim_cur = rlim.rlim_max = memlock_rlim; 162 if (setrlimit(RLIMIT_MEMLOCK, &rlim)) 163 return -errno; 164 165 return 0; 166 } 167 168 int bpf_map_create(enum bpf_map_type map_type, 169 const char *map_name, 170 __u32 key_size, 171 __u32 value_size, 172 __u32 max_entries, 173 const struct bpf_map_create_opts *opts) 174 { 175 const size_t attr_sz = offsetofend(union bpf_attr, excl_prog_hash_size); 176 union bpf_attr attr; 177 int fd; 178 179 bump_rlimit_memlock(); 180 181 memset(&attr, 0, attr_sz); 182 183 if (!OPTS_VALID(opts, bpf_map_create_opts)) 184 return libbpf_err(-EINVAL); 185 186 attr.map_type = map_type; 187 if (map_name && feat_supported(NULL, FEAT_PROG_NAME)) 188 libbpf_strlcpy(attr.map_name, map_name, sizeof(attr.map_name)); 189 attr.key_size = key_size; 190 attr.value_size = value_size; 191 attr.max_entries = max_entries; 192 193 attr.btf_fd = OPTS_GET(opts, btf_fd, 0); 194 attr.btf_key_type_id = OPTS_GET(opts, btf_key_type_id, 0); 195 attr.btf_value_type_id = OPTS_GET(opts, btf_value_type_id, 0); 196 attr.btf_vmlinux_value_type_id = OPTS_GET(opts, btf_vmlinux_value_type_id, 0); 197 attr.value_type_btf_obj_fd = OPTS_GET(opts, value_type_btf_obj_fd, 0); 198 199 attr.inner_map_fd = OPTS_GET(opts, inner_map_fd, 0); 200 attr.map_flags = OPTS_GET(opts, map_flags, 0); 201 attr.map_extra = OPTS_GET(opts, map_extra, 0); 202 attr.numa_node = OPTS_GET(opts, numa_node, 0); 203 attr.map_ifindex = OPTS_GET(opts, map_ifindex, 0); 204 205 attr.map_token_fd = OPTS_GET(opts, token_fd, 0); 206 attr.excl_prog_hash = ptr_to_u64(OPTS_GET(opts, excl_prog_hash, NULL)); 207 attr.excl_prog_hash_size = OPTS_GET(opts, excl_prog_hash_size, 0); 208 209 fd = sys_bpf_fd(BPF_MAP_CREATE, &attr, attr_sz); 210 return libbpf_err_errno(fd); 211 } 212 213 static void * 214 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 215 __u32 actual_rec_size, __u32 expected_rec_size) 216 { 217 __u64 info_len = (__u64)actual_rec_size * cnt; 218 void *info, *nrecord; 219 int i; 220 221 info = malloc(info_len); 222 if (!info) 223 return NULL; 224 225 /* zero out bytes kernel does not understand */ 226 nrecord = info; 227 for (i = 0; i < cnt; i++) { 228 memcpy(nrecord, orecord, expected_rec_size); 229 memset(nrecord + expected_rec_size, 0, 230 actual_rec_size - expected_rec_size); 231 orecord += actual_rec_size; 232 nrecord += actual_rec_size; 233 } 234 235 return info; 236 } 237 238 int bpf_prog_load(enum bpf_prog_type prog_type, 239 const char *prog_name, const char *license, 240 const struct bpf_insn *insns, size_t insn_cnt, 241 struct bpf_prog_load_opts *opts) 242 { 243 const size_t attr_sz = offsetofend(union bpf_attr, keyring_id); 244 void *finfo = NULL, *linfo = NULL; 245 const char *func_info, *line_info; 246 __u32 log_size, log_level, attach_prog_fd, attach_btf_obj_fd; 247 __u32 func_info_rec_size, line_info_rec_size; 248 int fd, attempts; 249 union bpf_attr attr; 250 char *log_buf; 251 252 bump_rlimit_memlock(); 253 254 if (!OPTS_VALID(opts, bpf_prog_load_opts)) 255 return libbpf_err(-EINVAL); 256 257 attempts = OPTS_GET(opts, attempts, 0); 258 if (attempts < 0) 259 return libbpf_err(-EINVAL); 260 if (attempts == 0) 261 attempts = PROG_LOAD_ATTEMPTS; 262 263 memset(&attr, 0, attr_sz); 264 265 attr.prog_type = prog_type; 266 attr.expected_attach_type = OPTS_GET(opts, expected_attach_type, 0); 267 268 attr.prog_btf_fd = OPTS_GET(opts, prog_btf_fd, 0); 269 attr.prog_flags = OPTS_GET(opts, prog_flags, 0); 270 attr.prog_ifindex = OPTS_GET(opts, prog_ifindex, 0); 271 attr.kern_version = OPTS_GET(opts, kern_version, 0); 272 attr.prog_token_fd = OPTS_GET(opts, token_fd, 0); 273 274 if (prog_name && feat_supported(NULL, FEAT_PROG_NAME)) 275 libbpf_strlcpy(attr.prog_name, prog_name, sizeof(attr.prog_name)); 276 attr.license = ptr_to_u64(license); 277 278 if (insn_cnt > UINT_MAX) 279 return libbpf_err(-E2BIG); 280 281 attr.insns = ptr_to_u64(insns); 282 attr.insn_cnt = (__u32)insn_cnt; 283 284 attach_prog_fd = OPTS_GET(opts, attach_prog_fd, 0); 285 attach_btf_obj_fd = OPTS_GET(opts, attach_btf_obj_fd, 0); 286 287 if (attach_prog_fd && attach_btf_obj_fd) 288 return libbpf_err(-EINVAL); 289 290 attr.attach_btf_id = OPTS_GET(opts, attach_btf_id, 0); 291 if (attach_prog_fd) 292 attr.attach_prog_fd = attach_prog_fd; 293 else 294 attr.attach_btf_obj_fd = attach_btf_obj_fd; 295 296 log_buf = OPTS_GET(opts, log_buf, NULL); 297 log_size = OPTS_GET(opts, log_size, 0); 298 log_level = OPTS_GET(opts, log_level, 0); 299 300 if (!!log_buf != !!log_size) 301 return libbpf_err(-EINVAL); 302 303 func_info_rec_size = OPTS_GET(opts, func_info_rec_size, 0); 304 func_info = OPTS_GET(opts, func_info, NULL); 305 attr.func_info_rec_size = func_info_rec_size; 306 attr.func_info = ptr_to_u64(func_info); 307 attr.func_info_cnt = OPTS_GET(opts, func_info_cnt, 0); 308 309 line_info_rec_size = OPTS_GET(opts, line_info_rec_size, 0); 310 line_info = OPTS_GET(opts, line_info, NULL); 311 attr.line_info_rec_size = line_info_rec_size; 312 attr.line_info = ptr_to_u64(line_info); 313 attr.line_info_cnt = OPTS_GET(opts, line_info_cnt, 0); 314 315 attr.fd_array = ptr_to_u64(OPTS_GET(opts, fd_array, NULL)); 316 attr.fd_array_cnt = OPTS_GET(opts, fd_array_cnt, 0); 317 318 if (log_level) { 319 attr.log_buf = ptr_to_u64(log_buf); 320 attr.log_size = log_size; 321 attr.log_level = log_level; 322 } 323 324 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 325 OPTS_SET(opts, log_true_size, attr.log_true_size); 326 if (fd >= 0) 327 return fd; 328 329 /* After bpf_prog_load, the kernel may modify certain attributes 330 * to give user space a hint how to deal with loading failure. 331 * Check to see whether we can make some changes and load again. 332 */ 333 while (errno == E2BIG && (!finfo || !linfo)) { 334 if (!finfo && attr.func_info_cnt && 335 attr.func_info_rec_size < func_info_rec_size) { 336 /* try with corrected func info records */ 337 finfo = alloc_zero_tailing_info(func_info, 338 attr.func_info_cnt, 339 func_info_rec_size, 340 attr.func_info_rec_size); 341 if (!finfo) { 342 errno = E2BIG; 343 goto done; 344 } 345 346 attr.func_info = ptr_to_u64(finfo); 347 attr.func_info_rec_size = func_info_rec_size; 348 } else if (!linfo && attr.line_info_cnt && 349 attr.line_info_rec_size < line_info_rec_size) { 350 linfo = alloc_zero_tailing_info(line_info, 351 attr.line_info_cnt, 352 line_info_rec_size, 353 attr.line_info_rec_size); 354 if (!linfo) { 355 errno = E2BIG; 356 goto done; 357 } 358 359 attr.line_info = ptr_to_u64(linfo); 360 attr.line_info_rec_size = line_info_rec_size; 361 } else { 362 break; 363 } 364 365 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 366 OPTS_SET(opts, log_true_size, attr.log_true_size); 367 if (fd >= 0) 368 goto done; 369 } 370 371 if (log_level == 0 && log_buf) { 372 /* log_level == 0 with non-NULL log_buf requires retrying on error 373 * with log_level == 1 and log_buf/log_buf_size set, to get details of 374 * failure 375 */ 376 attr.log_buf = ptr_to_u64(log_buf); 377 attr.log_size = log_size; 378 attr.log_level = 1; 379 380 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 381 OPTS_SET(opts, log_true_size, attr.log_true_size); 382 } 383 done: 384 /* free() doesn't affect errno, so we don't need to restore it */ 385 free(finfo); 386 free(linfo); 387 return libbpf_err_errno(fd); 388 } 389 390 int bpf_map_update_elem(int fd, const void *key, const void *value, 391 __u64 flags) 392 { 393 const size_t attr_sz = offsetofend(union bpf_attr, flags); 394 union bpf_attr attr; 395 int ret; 396 397 memset(&attr, 0, attr_sz); 398 attr.map_fd = fd; 399 attr.key = ptr_to_u64(key); 400 attr.value = ptr_to_u64(value); 401 attr.flags = flags; 402 403 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, attr_sz); 404 return libbpf_err_errno(ret); 405 } 406 407 int bpf_map_lookup_elem(int fd, const void *key, void *value) 408 { 409 const size_t attr_sz = offsetofend(union bpf_attr, flags); 410 union bpf_attr attr; 411 int ret; 412 413 memset(&attr, 0, attr_sz); 414 attr.map_fd = fd; 415 attr.key = ptr_to_u64(key); 416 attr.value = ptr_to_u64(value); 417 418 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz); 419 return libbpf_err_errno(ret); 420 } 421 422 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 423 { 424 const size_t attr_sz = offsetofend(union bpf_attr, flags); 425 union bpf_attr attr; 426 int ret; 427 428 memset(&attr, 0, attr_sz); 429 attr.map_fd = fd; 430 attr.key = ptr_to_u64(key); 431 attr.value = ptr_to_u64(value); 432 attr.flags = flags; 433 434 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz); 435 return libbpf_err_errno(ret); 436 } 437 438 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 439 { 440 const size_t attr_sz = offsetofend(union bpf_attr, flags); 441 union bpf_attr attr; 442 int ret; 443 444 memset(&attr, 0, attr_sz); 445 attr.map_fd = fd; 446 attr.key = ptr_to_u64(key); 447 attr.value = ptr_to_u64(value); 448 449 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz); 450 return libbpf_err_errno(ret); 451 } 452 453 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags) 454 { 455 const size_t attr_sz = offsetofend(union bpf_attr, flags); 456 union bpf_attr attr; 457 int ret; 458 459 memset(&attr, 0, attr_sz); 460 attr.map_fd = fd; 461 attr.key = ptr_to_u64(key); 462 attr.value = ptr_to_u64(value); 463 attr.flags = flags; 464 465 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz); 466 return libbpf_err_errno(ret); 467 } 468 469 int bpf_map_delete_elem(int fd, const void *key) 470 { 471 const size_t attr_sz = offsetofend(union bpf_attr, flags); 472 union bpf_attr attr; 473 int ret; 474 475 memset(&attr, 0, attr_sz); 476 attr.map_fd = fd; 477 attr.key = ptr_to_u64(key); 478 479 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz); 480 return libbpf_err_errno(ret); 481 } 482 483 int bpf_map_delete_elem_flags(int fd, const void *key, __u64 flags) 484 { 485 const size_t attr_sz = offsetofend(union bpf_attr, flags); 486 union bpf_attr attr; 487 int ret; 488 489 memset(&attr, 0, attr_sz); 490 attr.map_fd = fd; 491 attr.key = ptr_to_u64(key); 492 attr.flags = flags; 493 494 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz); 495 return libbpf_err_errno(ret); 496 } 497 498 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 499 { 500 const size_t attr_sz = offsetofend(union bpf_attr, next_key); 501 union bpf_attr attr; 502 int ret; 503 504 memset(&attr, 0, attr_sz); 505 attr.map_fd = fd; 506 attr.key = ptr_to_u64(key); 507 attr.next_key = ptr_to_u64(next_key); 508 509 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, attr_sz); 510 return libbpf_err_errno(ret); 511 } 512 513 int bpf_map_freeze(int fd) 514 { 515 const size_t attr_sz = offsetofend(union bpf_attr, map_fd); 516 union bpf_attr attr; 517 int ret; 518 519 memset(&attr, 0, attr_sz); 520 attr.map_fd = fd; 521 522 ret = sys_bpf(BPF_MAP_FREEZE, &attr, attr_sz); 523 return libbpf_err_errno(ret); 524 } 525 526 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 527 void *out_batch, void *keys, void *values, 528 __u32 *count, 529 const struct bpf_map_batch_opts *opts) 530 { 531 const size_t attr_sz = offsetofend(union bpf_attr, batch); 532 union bpf_attr attr; 533 int ret; 534 535 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 536 return libbpf_err(-EINVAL); 537 538 memset(&attr, 0, attr_sz); 539 attr.batch.map_fd = fd; 540 attr.batch.in_batch = ptr_to_u64(in_batch); 541 attr.batch.out_batch = ptr_to_u64(out_batch); 542 attr.batch.keys = ptr_to_u64(keys); 543 attr.batch.values = ptr_to_u64(values); 544 attr.batch.count = *count; 545 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 546 attr.batch.flags = OPTS_GET(opts, flags, 0); 547 548 ret = sys_bpf(cmd, &attr, attr_sz); 549 *count = attr.batch.count; 550 551 return libbpf_err_errno(ret); 552 } 553 554 int bpf_map_delete_batch(int fd, const void *keys, __u32 *count, 555 const struct bpf_map_batch_opts *opts) 556 { 557 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 558 NULL, (void *)keys, NULL, count, opts); 559 } 560 561 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 562 void *values, __u32 *count, 563 const struct bpf_map_batch_opts *opts) 564 { 565 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 566 out_batch, keys, values, count, opts); 567 } 568 569 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 570 void *keys, void *values, __u32 *count, 571 const struct bpf_map_batch_opts *opts) 572 { 573 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 574 fd, in_batch, out_batch, keys, values, 575 count, opts); 576 } 577 578 int bpf_map_update_batch(int fd, const void *keys, const void *values, __u32 *count, 579 const struct bpf_map_batch_opts *opts) 580 { 581 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 582 (void *)keys, (void *)values, count, opts); 583 } 584 585 int bpf_obj_pin_opts(int fd, const char *pathname, const struct bpf_obj_pin_opts *opts) 586 { 587 const size_t attr_sz = offsetofend(union bpf_attr, path_fd); 588 union bpf_attr attr; 589 int ret; 590 591 if (!OPTS_VALID(opts, bpf_obj_pin_opts)) 592 return libbpf_err(-EINVAL); 593 594 memset(&attr, 0, attr_sz); 595 attr.path_fd = OPTS_GET(opts, path_fd, 0); 596 attr.pathname = ptr_to_u64((void *)pathname); 597 attr.file_flags = OPTS_GET(opts, file_flags, 0); 598 attr.bpf_fd = fd; 599 600 ret = sys_bpf(BPF_OBJ_PIN, &attr, attr_sz); 601 return libbpf_err_errno(ret); 602 } 603 604 int bpf_obj_pin(int fd, const char *pathname) 605 { 606 return bpf_obj_pin_opts(fd, pathname, NULL); 607 } 608 609 int bpf_obj_get(const char *pathname) 610 { 611 return bpf_obj_get_opts(pathname, NULL); 612 } 613 614 int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts) 615 { 616 const size_t attr_sz = offsetofend(union bpf_attr, path_fd); 617 union bpf_attr attr; 618 int fd; 619 620 if (!OPTS_VALID(opts, bpf_obj_get_opts)) 621 return libbpf_err(-EINVAL); 622 623 memset(&attr, 0, attr_sz); 624 attr.path_fd = OPTS_GET(opts, path_fd, 0); 625 attr.pathname = ptr_to_u64((void *)pathname); 626 attr.file_flags = OPTS_GET(opts, file_flags, 0); 627 628 fd = sys_bpf_fd(BPF_OBJ_GET, &attr, attr_sz); 629 return libbpf_err_errno(fd); 630 } 631 632 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 633 unsigned int flags) 634 { 635 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 636 .flags = flags, 637 ); 638 639 return bpf_prog_attach_opts(prog_fd, target_fd, type, &opts); 640 } 641 642 int bpf_prog_attach_opts(int prog_fd, int target, enum bpf_attach_type type, 643 const struct bpf_prog_attach_opts *opts) 644 { 645 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision); 646 __u32 relative_id, flags; 647 int ret, relative_fd; 648 union bpf_attr attr; 649 650 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 651 return libbpf_err(-EINVAL); 652 653 relative_id = OPTS_GET(opts, relative_id, 0); 654 relative_fd = OPTS_GET(opts, relative_fd, 0); 655 flags = OPTS_GET(opts, flags, 0); 656 657 /* validate we don't have unexpected combinations of non-zero fields */ 658 if (relative_fd && relative_id) 659 return libbpf_err(-EINVAL); 660 661 memset(&attr, 0, attr_sz); 662 attr.target_fd = target; 663 attr.attach_bpf_fd = prog_fd; 664 attr.attach_type = type; 665 attr.replace_bpf_fd = OPTS_GET(opts, replace_fd, 0); 666 attr.expected_revision = OPTS_GET(opts, expected_revision, 0); 667 668 if (relative_id) { 669 attr.attach_flags = flags | BPF_F_ID; 670 attr.relative_id = relative_id; 671 } else { 672 attr.attach_flags = flags; 673 attr.relative_fd = relative_fd; 674 } 675 676 ret = sys_bpf(BPF_PROG_ATTACH, &attr, attr_sz); 677 return libbpf_err_errno(ret); 678 } 679 680 int bpf_prog_detach_opts(int prog_fd, int target, enum bpf_attach_type type, 681 const struct bpf_prog_detach_opts *opts) 682 { 683 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision); 684 __u32 relative_id, flags; 685 int ret, relative_fd; 686 union bpf_attr attr; 687 688 if (!OPTS_VALID(opts, bpf_prog_detach_opts)) 689 return libbpf_err(-EINVAL); 690 691 relative_id = OPTS_GET(opts, relative_id, 0); 692 relative_fd = OPTS_GET(opts, relative_fd, 0); 693 flags = OPTS_GET(opts, flags, 0); 694 695 /* validate we don't have unexpected combinations of non-zero fields */ 696 if (relative_fd && relative_id) 697 return libbpf_err(-EINVAL); 698 699 memset(&attr, 0, attr_sz); 700 attr.target_fd = target; 701 attr.attach_bpf_fd = prog_fd; 702 attr.attach_type = type; 703 attr.expected_revision = OPTS_GET(opts, expected_revision, 0); 704 705 if (relative_id) { 706 attr.attach_flags = flags | BPF_F_ID; 707 attr.relative_id = relative_id; 708 } else { 709 attr.attach_flags = flags; 710 attr.relative_fd = relative_fd; 711 } 712 713 ret = sys_bpf(BPF_PROG_DETACH, &attr, attr_sz); 714 return libbpf_err_errno(ret); 715 } 716 717 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 718 { 719 return bpf_prog_detach_opts(0, target_fd, type, NULL); 720 } 721 722 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 723 { 724 return bpf_prog_detach_opts(prog_fd, target_fd, type, NULL); 725 } 726 727 int bpf_link_create(int prog_fd, int target_fd, 728 enum bpf_attach_type attach_type, 729 const struct bpf_link_create_opts *opts) 730 { 731 const size_t attr_sz = offsetofend(union bpf_attr, link_create); 732 __u32 target_btf_id, iter_info_len, relative_id; 733 int fd, err, relative_fd; 734 union bpf_attr attr; 735 736 if (!OPTS_VALID(opts, bpf_link_create_opts)) 737 return libbpf_err(-EINVAL); 738 739 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 740 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 741 742 /* validate we don't have unexpected combinations of non-zero fields */ 743 if (iter_info_len || target_btf_id) { 744 if (iter_info_len && target_btf_id) 745 return libbpf_err(-EINVAL); 746 if (!OPTS_ZEROED(opts, target_btf_id)) 747 return libbpf_err(-EINVAL); 748 } 749 750 memset(&attr, 0, attr_sz); 751 attr.link_create.prog_fd = prog_fd; 752 attr.link_create.target_fd = target_fd; 753 attr.link_create.attach_type = attach_type; 754 attr.link_create.flags = OPTS_GET(opts, flags, 0); 755 756 if (target_btf_id) { 757 attr.link_create.target_btf_id = target_btf_id; 758 goto proceed; 759 } 760 761 switch (attach_type) { 762 case BPF_TRACE_ITER: 763 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 764 attr.link_create.iter_info_len = iter_info_len; 765 break; 766 case BPF_PERF_EVENT: 767 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0); 768 if (!OPTS_ZEROED(opts, perf_event)) 769 return libbpf_err(-EINVAL); 770 break; 771 case BPF_TRACE_KPROBE_MULTI: 772 case BPF_TRACE_KPROBE_SESSION: 773 attr.link_create.kprobe_multi.flags = OPTS_GET(opts, kprobe_multi.flags, 0); 774 attr.link_create.kprobe_multi.cnt = OPTS_GET(opts, kprobe_multi.cnt, 0); 775 attr.link_create.kprobe_multi.syms = ptr_to_u64(OPTS_GET(opts, kprobe_multi.syms, 0)); 776 attr.link_create.kprobe_multi.addrs = ptr_to_u64(OPTS_GET(opts, kprobe_multi.addrs, 0)); 777 attr.link_create.kprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, kprobe_multi.cookies, 0)); 778 if (!OPTS_ZEROED(opts, kprobe_multi)) 779 return libbpf_err(-EINVAL); 780 break; 781 case BPF_TRACE_UPROBE_MULTI: 782 case BPF_TRACE_UPROBE_SESSION: 783 attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0); 784 attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0); 785 attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0)); 786 attr.link_create.uprobe_multi.offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.offsets, 0)); 787 attr.link_create.uprobe_multi.ref_ctr_offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.ref_ctr_offsets, 0)); 788 attr.link_create.uprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, uprobe_multi.cookies, 0)); 789 attr.link_create.uprobe_multi.pid = OPTS_GET(opts, uprobe_multi.pid, 0); 790 if (!OPTS_ZEROED(opts, uprobe_multi)) 791 return libbpf_err(-EINVAL); 792 break; 793 case BPF_TRACE_RAW_TP: 794 case BPF_TRACE_FENTRY: 795 case BPF_TRACE_FEXIT: 796 case BPF_MODIFY_RETURN: 797 case BPF_LSM_MAC: 798 attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0); 799 if (!OPTS_ZEROED(opts, tracing)) 800 return libbpf_err(-EINVAL); 801 break; 802 case BPF_NETFILTER: 803 attr.link_create.netfilter.pf = OPTS_GET(opts, netfilter.pf, 0); 804 attr.link_create.netfilter.hooknum = OPTS_GET(opts, netfilter.hooknum, 0); 805 attr.link_create.netfilter.priority = OPTS_GET(opts, netfilter.priority, 0); 806 attr.link_create.netfilter.flags = OPTS_GET(opts, netfilter.flags, 0); 807 if (!OPTS_ZEROED(opts, netfilter)) 808 return libbpf_err(-EINVAL); 809 break; 810 case BPF_TCX_INGRESS: 811 case BPF_TCX_EGRESS: 812 relative_fd = OPTS_GET(opts, tcx.relative_fd, 0); 813 relative_id = OPTS_GET(opts, tcx.relative_id, 0); 814 if (relative_fd && relative_id) 815 return libbpf_err(-EINVAL); 816 if (relative_id) { 817 attr.link_create.tcx.relative_id = relative_id; 818 attr.link_create.flags |= BPF_F_ID; 819 } else { 820 attr.link_create.tcx.relative_fd = relative_fd; 821 } 822 attr.link_create.tcx.expected_revision = OPTS_GET(opts, tcx.expected_revision, 0); 823 if (!OPTS_ZEROED(opts, tcx)) 824 return libbpf_err(-EINVAL); 825 break; 826 case BPF_NETKIT_PRIMARY: 827 case BPF_NETKIT_PEER: 828 relative_fd = OPTS_GET(opts, netkit.relative_fd, 0); 829 relative_id = OPTS_GET(opts, netkit.relative_id, 0); 830 if (relative_fd && relative_id) 831 return libbpf_err(-EINVAL); 832 if (relative_id) { 833 attr.link_create.netkit.relative_id = relative_id; 834 attr.link_create.flags |= BPF_F_ID; 835 } else { 836 attr.link_create.netkit.relative_fd = relative_fd; 837 } 838 attr.link_create.netkit.expected_revision = OPTS_GET(opts, netkit.expected_revision, 0); 839 if (!OPTS_ZEROED(opts, netkit)) 840 return libbpf_err(-EINVAL); 841 break; 842 case BPF_CGROUP_INET_INGRESS: 843 case BPF_CGROUP_INET_EGRESS: 844 case BPF_CGROUP_INET_SOCK_CREATE: 845 case BPF_CGROUP_INET_SOCK_RELEASE: 846 case BPF_CGROUP_INET4_BIND: 847 case BPF_CGROUP_INET6_BIND: 848 case BPF_CGROUP_INET4_POST_BIND: 849 case BPF_CGROUP_INET6_POST_BIND: 850 case BPF_CGROUP_INET4_CONNECT: 851 case BPF_CGROUP_INET6_CONNECT: 852 case BPF_CGROUP_UNIX_CONNECT: 853 case BPF_CGROUP_INET4_GETPEERNAME: 854 case BPF_CGROUP_INET6_GETPEERNAME: 855 case BPF_CGROUP_UNIX_GETPEERNAME: 856 case BPF_CGROUP_INET4_GETSOCKNAME: 857 case BPF_CGROUP_INET6_GETSOCKNAME: 858 case BPF_CGROUP_UNIX_GETSOCKNAME: 859 case BPF_CGROUP_UDP4_SENDMSG: 860 case BPF_CGROUP_UDP6_SENDMSG: 861 case BPF_CGROUP_UNIX_SENDMSG: 862 case BPF_CGROUP_UDP4_RECVMSG: 863 case BPF_CGROUP_UDP6_RECVMSG: 864 case BPF_CGROUP_UNIX_RECVMSG: 865 case BPF_CGROUP_SOCK_OPS: 866 case BPF_CGROUP_DEVICE: 867 case BPF_CGROUP_SYSCTL: 868 case BPF_CGROUP_GETSOCKOPT: 869 case BPF_CGROUP_SETSOCKOPT: 870 case BPF_LSM_CGROUP: 871 relative_fd = OPTS_GET(opts, cgroup.relative_fd, 0); 872 relative_id = OPTS_GET(opts, cgroup.relative_id, 0); 873 if (relative_fd && relative_id) 874 return libbpf_err(-EINVAL); 875 if (relative_id) { 876 attr.link_create.cgroup.relative_id = relative_id; 877 attr.link_create.flags |= BPF_F_ID; 878 } else { 879 attr.link_create.cgroup.relative_fd = relative_fd; 880 } 881 attr.link_create.cgroup.expected_revision = 882 OPTS_GET(opts, cgroup.expected_revision, 0); 883 if (!OPTS_ZEROED(opts, cgroup)) 884 return libbpf_err(-EINVAL); 885 break; 886 default: 887 if (!OPTS_ZEROED(opts, flags)) 888 return libbpf_err(-EINVAL); 889 break; 890 } 891 proceed: 892 fd = sys_bpf_fd(BPF_LINK_CREATE, &attr, attr_sz); 893 if (fd >= 0) 894 return fd; 895 /* we'll get EINVAL if LINK_CREATE doesn't support attaching fentry 896 * and other similar programs 897 */ 898 err = -errno; 899 if (err != -EINVAL) 900 return libbpf_err(err); 901 902 /* if user used features not supported by 903 * BPF_RAW_TRACEPOINT_OPEN command, then just give up immediately 904 */ 905 if (attr.link_create.target_fd || attr.link_create.target_btf_id) 906 return libbpf_err(err); 907 if (!OPTS_ZEROED(opts, sz)) 908 return libbpf_err(err); 909 910 /* otherwise, for few select kinds of programs that can be 911 * attached using BPF_RAW_TRACEPOINT_OPEN command, try that as 912 * a fallback for older kernels 913 */ 914 switch (attach_type) { 915 case BPF_TRACE_RAW_TP: 916 case BPF_LSM_MAC: 917 case BPF_TRACE_FENTRY: 918 case BPF_TRACE_FEXIT: 919 case BPF_MODIFY_RETURN: 920 return bpf_raw_tracepoint_open(NULL, prog_fd); 921 default: 922 return libbpf_err(err); 923 } 924 } 925 926 int bpf_link_detach(int link_fd) 927 { 928 const size_t attr_sz = offsetofend(union bpf_attr, link_detach); 929 union bpf_attr attr; 930 int ret; 931 932 memset(&attr, 0, attr_sz); 933 attr.link_detach.link_fd = link_fd; 934 935 ret = sys_bpf(BPF_LINK_DETACH, &attr, attr_sz); 936 return libbpf_err_errno(ret); 937 } 938 939 int bpf_link_update(int link_fd, int new_prog_fd, 940 const struct bpf_link_update_opts *opts) 941 { 942 const size_t attr_sz = offsetofend(union bpf_attr, link_update); 943 union bpf_attr attr; 944 int ret; 945 946 if (!OPTS_VALID(opts, bpf_link_update_opts)) 947 return libbpf_err(-EINVAL); 948 949 if (OPTS_GET(opts, old_prog_fd, 0) && OPTS_GET(opts, old_map_fd, 0)) 950 return libbpf_err(-EINVAL); 951 952 memset(&attr, 0, attr_sz); 953 attr.link_update.link_fd = link_fd; 954 attr.link_update.new_prog_fd = new_prog_fd; 955 attr.link_update.flags = OPTS_GET(opts, flags, 0); 956 if (OPTS_GET(opts, old_prog_fd, 0)) 957 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 958 else if (OPTS_GET(opts, old_map_fd, 0)) 959 attr.link_update.old_map_fd = OPTS_GET(opts, old_map_fd, 0); 960 961 ret = sys_bpf(BPF_LINK_UPDATE, &attr, attr_sz); 962 return libbpf_err_errno(ret); 963 } 964 965 int bpf_iter_create(int link_fd) 966 { 967 const size_t attr_sz = offsetofend(union bpf_attr, iter_create); 968 union bpf_attr attr; 969 int fd; 970 971 memset(&attr, 0, attr_sz); 972 attr.iter_create.link_fd = link_fd; 973 974 fd = sys_bpf_fd(BPF_ITER_CREATE, &attr, attr_sz); 975 return libbpf_err_errno(fd); 976 } 977 978 int bpf_prog_query_opts(int target, enum bpf_attach_type type, 979 struct bpf_prog_query_opts *opts) 980 { 981 const size_t attr_sz = offsetofend(union bpf_attr, query); 982 union bpf_attr attr; 983 int ret; 984 985 if (!OPTS_VALID(opts, bpf_prog_query_opts)) 986 return libbpf_err(-EINVAL); 987 988 memset(&attr, 0, attr_sz); 989 attr.query.target_fd = target; 990 attr.query.attach_type = type; 991 attr.query.query_flags = OPTS_GET(opts, query_flags, 0); 992 attr.query.count = OPTS_GET(opts, count, 0); 993 attr.query.prog_ids = ptr_to_u64(OPTS_GET(opts, prog_ids, NULL)); 994 attr.query.link_ids = ptr_to_u64(OPTS_GET(opts, link_ids, NULL)); 995 attr.query.prog_attach_flags = ptr_to_u64(OPTS_GET(opts, prog_attach_flags, NULL)); 996 attr.query.link_attach_flags = ptr_to_u64(OPTS_GET(opts, link_attach_flags, NULL)); 997 998 ret = sys_bpf(BPF_PROG_QUERY, &attr, attr_sz); 999 1000 OPTS_SET(opts, attach_flags, attr.query.attach_flags); 1001 OPTS_SET(opts, revision, attr.query.revision); 1002 OPTS_SET(opts, count, attr.query.count); 1003 1004 return libbpf_err_errno(ret); 1005 } 1006 1007 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 1008 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 1009 { 1010 LIBBPF_OPTS(bpf_prog_query_opts, opts); 1011 int ret; 1012 1013 opts.query_flags = query_flags; 1014 opts.prog_ids = prog_ids; 1015 opts.prog_cnt = *prog_cnt; 1016 1017 ret = bpf_prog_query_opts(target_fd, type, &opts); 1018 1019 if (attach_flags) 1020 *attach_flags = opts.attach_flags; 1021 *prog_cnt = opts.prog_cnt; 1022 1023 return libbpf_err_errno(ret); 1024 } 1025 1026 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 1027 { 1028 const size_t attr_sz = offsetofend(union bpf_attr, test); 1029 union bpf_attr attr; 1030 int ret; 1031 1032 if (!OPTS_VALID(opts, bpf_test_run_opts)) 1033 return libbpf_err(-EINVAL); 1034 1035 memset(&attr, 0, attr_sz); 1036 attr.test.prog_fd = prog_fd; 1037 attr.test.batch_size = OPTS_GET(opts, batch_size, 0); 1038 attr.test.cpu = OPTS_GET(opts, cpu, 0); 1039 attr.test.flags = OPTS_GET(opts, flags, 0); 1040 attr.test.repeat = OPTS_GET(opts, repeat, 0); 1041 attr.test.duration = OPTS_GET(opts, duration, 0); 1042 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 1043 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 1044 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 1045 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 1046 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 1047 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 1048 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 1049 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 1050 1051 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, attr_sz); 1052 1053 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 1054 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 1055 OPTS_SET(opts, duration, attr.test.duration); 1056 OPTS_SET(opts, retval, attr.test.retval); 1057 1058 return libbpf_err_errno(ret); 1059 } 1060 1061 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 1062 { 1063 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1064 union bpf_attr attr; 1065 int err; 1066 1067 memset(&attr, 0, attr_sz); 1068 attr.start_id = start_id; 1069 1070 err = sys_bpf(cmd, &attr, attr_sz); 1071 if (!err) 1072 *next_id = attr.next_id; 1073 1074 return libbpf_err_errno(err); 1075 } 1076 1077 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 1078 { 1079 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 1080 } 1081 1082 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 1083 { 1084 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 1085 } 1086 1087 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 1088 { 1089 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 1090 } 1091 1092 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 1093 { 1094 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 1095 } 1096 1097 int bpf_prog_get_fd_by_id_opts(__u32 id, 1098 const struct bpf_get_fd_by_id_opts *opts) 1099 { 1100 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1101 union bpf_attr attr; 1102 int fd; 1103 1104 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1105 return libbpf_err(-EINVAL); 1106 1107 memset(&attr, 0, attr_sz); 1108 attr.prog_id = id; 1109 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1110 1111 fd = sys_bpf_fd(BPF_PROG_GET_FD_BY_ID, &attr, attr_sz); 1112 return libbpf_err_errno(fd); 1113 } 1114 1115 int bpf_prog_get_fd_by_id(__u32 id) 1116 { 1117 return bpf_prog_get_fd_by_id_opts(id, NULL); 1118 } 1119 1120 int bpf_map_get_fd_by_id_opts(__u32 id, 1121 const struct bpf_get_fd_by_id_opts *opts) 1122 { 1123 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1124 union bpf_attr attr; 1125 int fd; 1126 1127 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1128 return libbpf_err(-EINVAL); 1129 1130 memset(&attr, 0, attr_sz); 1131 attr.map_id = id; 1132 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1133 1134 fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, attr_sz); 1135 return libbpf_err_errno(fd); 1136 } 1137 1138 int bpf_map_get_fd_by_id(__u32 id) 1139 { 1140 return bpf_map_get_fd_by_id_opts(id, NULL); 1141 } 1142 1143 int bpf_btf_get_fd_by_id_opts(__u32 id, 1144 const struct bpf_get_fd_by_id_opts *opts) 1145 { 1146 const size_t attr_sz = offsetofend(union bpf_attr, fd_by_id_token_fd); 1147 union bpf_attr attr; 1148 int fd; 1149 1150 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1151 return libbpf_err(-EINVAL); 1152 1153 memset(&attr, 0, attr_sz); 1154 attr.btf_id = id; 1155 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1156 attr.fd_by_id_token_fd = OPTS_GET(opts, token_fd, 0); 1157 1158 fd = sys_bpf_fd(BPF_BTF_GET_FD_BY_ID, &attr, attr_sz); 1159 return libbpf_err_errno(fd); 1160 } 1161 1162 int bpf_btf_get_fd_by_id(__u32 id) 1163 { 1164 return bpf_btf_get_fd_by_id_opts(id, NULL); 1165 } 1166 1167 int bpf_link_get_fd_by_id_opts(__u32 id, 1168 const struct bpf_get_fd_by_id_opts *opts) 1169 { 1170 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1171 union bpf_attr attr; 1172 int fd; 1173 1174 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1175 return libbpf_err(-EINVAL); 1176 1177 memset(&attr, 0, attr_sz); 1178 attr.link_id = id; 1179 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1180 1181 fd = sys_bpf_fd(BPF_LINK_GET_FD_BY_ID, &attr, attr_sz); 1182 return libbpf_err_errno(fd); 1183 } 1184 1185 int bpf_link_get_fd_by_id(__u32 id) 1186 { 1187 return bpf_link_get_fd_by_id_opts(id, NULL); 1188 } 1189 1190 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 1191 { 1192 const size_t attr_sz = offsetofend(union bpf_attr, info); 1193 union bpf_attr attr; 1194 int err; 1195 1196 memset(&attr, 0, attr_sz); 1197 attr.info.bpf_fd = bpf_fd; 1198 attr.info.info_len = *info_len; 1199 attr.info.info = ptr_to_u64(info); 1200 1201 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, attr_sz); 1202 if (!err) 1203 *info_len = attr.info.info_len; 1204 return libbpf_err_errno(err); 1205 } 1206 1207 int bpf_prog_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, __u32 *info_len) 1208 { 1209 return bpf_obj_get_info_by_fd(prog_fd, info, info_len); 1210 } 1211 1212 int bpf_map_get_info_by_fd(int map_fd, struct bpf_map_info *info, __u32 *info_len) 1213 { 1214 return bpf_obj_get_info_by_fd(map_fd, info, info_len); 1215 } 1216 1217 int bpf_btf_get_info_by_fd(int btf_fd, struct bpf_btf_info *info, __u32 *info_len) 1218 { 1219 return bpf_obj_get_info_by_fd(btf_fd, info, info_len); 1220 } 1221 1222 int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len) 1223 { 1224 return bpf_obj_get_info_by_fd(link_fd, info, info_len); 1225 } 1226 1227 int bpf_raw_tracepoint_open_opts(int prog_fd, struct bpf_raw_tp_opts *opts) 1228 { 1229 const size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint); 1230 union bpf_attr attr; 1231 int fd; 1232 1233 if (!OPTS_VALID(opts, bpf_raw_tp_opts)) 1234 return libbpf_err(-EINVAL); 1235 1236 memset(&attr, 0, attr_sz); 1237 attr.raw_tracepoint.prog_fd = prog_fd; 1238 attr.raw_tracepoint.name = ptr_to_u64(OPTS_GET(opts, tp_name, NULL)); 1239 attr.raw_tracepoint.cookie = OPTS_GET(opts, cookie, 0); 1240 1241 fd = sys_bpf_fd(BPF_RAW_TRACEPOINT_OPEN, &attr, attr_sz); 1242 return libbpf_err_errno(fd); 1243 } 1244 1245 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 1246 { 1247 LIBBPF_OPTS(bpf_raw_tp_opts, opts, .tp_name = name); 1248 1249 return bpf_raw_tracepoint_open_opts(prog_fd, &opts); 1250 } 1251 1252 int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts) 1253 { 1254 const size_t attr_sz = offsetofend(union bpf_attr, btf_token_fd); 1255 union bpf_attr attr; 1256 char *log_buf; 1257 size_t log_size; 1258 __u32 log_level; 1259 int fd; 1260 1261 bump_rlimit_memlock(); 1262 1263 memset(&attr, 0, attr_sz); 1264 1265 if (!OPTS_VALID(opts, bpf_btf_load_opts)) 1266 return libbpf_err(-EINVAL); 1267 1268 log_buf = OPTS_GET(opts, log_buf, NULL); 1269 log_size = OPTS_GET(opts, log_size, 0); 1270 log_level = OPTS_GET(opts, log_level, 0); 1271 1272 if (log_size > UINT_MAX) 1273 return libbpf_err(-EINVAL); 1274 if (log_size && !log_buf) 1275 return libbpf_err(-EINVAL); 1276 1277 attr.btf = ptr_to_u64(btf_data); 1278 attr.btf_size = btf_size; 1279 1280 attr.btf_flags = OPTS_GET(opts, btf_flags, 0); 1281 attr.btf_token_fd = OPTS_GET(opts, token_fd, 0); 1282 1283 /* log_level == 0 and log_buf != NULL means "try loading without 1284 * log_buf, but retry with log_buf and log_level=1 on error", which is 1285 * consistent across low-level and high-level BTF and program loading 1286 * APIs within libbpf and provides a sensible behavior in practice 1287 */ 1288 if (log_level) { 1289 attr.btf_log_buf = ptr_to_u64(log_buf); 1290 attr.btf_log_size = (__u32)log_size; 1291 attr.btf_log_level = log_level; 1292 } 1293 1294 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz); 1295 if (fd < 0 && log_buf && log_level == 0) { 1296 attr.btf_log_buf = ptr_to_u64(log_buf); 1297 attr.btf_log_size = (__u32)log_size; 1298 attr.btf_log_level = 1; 1299 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz); 1300 } 1301 1302 OPTS_SET(opts, log_true_size, attr.btf_log_true_size); 1303 return libbpf_err_errno(fd); 1304 } 1305 1306 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 1307 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 1308 __u64 *probe_addr) 1309 { 1310 const size_t attr_sz = offsetofend(union bpf_attr, task_fd_query); 1311 union bpf_attr attr; 1312 int err; 1313 1314 memset(&attr, 0, attr_sz); 1315 attr.task_fd_query.pid = pid; 1316 attr.task_fd_query.fd = fd; 1317 attr.task_fd_query.flags = flags; 1318 attr.task_fd_query.buf = ptr_to_u64(buf); 1319 attr.task_fd_query.buf_len = *buf_len; 1320 1321 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, attr_sz); 1322 1323 *buf_len = attr.task_fd_query.buf_len; 1324 *prog_id = attr.task_fd_query.prog_id; 1325 *fd_type = attr.task_fd_query.fd_type; 1326 *probe_offset = attr.task_fd_query.probe_offset; 1327 *probe_addr = attr.task_fd_query.probe_addr; 1328 1329 return libbpf_err_errno(err); 1330 } 1331 1332 int bpf_enable_stats(enum bpf_stats_type type) 1333 { 1334 const size_t attr_sz = offsetofend(union bpf_attr, enable_stats); 1335 union bpf_attr attr; 1336 int fd; 1337 1338 memset(&attr, 0, attr_sz); 1339 attr.enable_stats.type = type; 1340 1341 fd = sys_bpf_fd(BPF_ENABLE_STATS, &attr, attr_sz); 1342 return libbpf_err_errno(fd); 1343 } 1344 1345 int bpf_prog_bind_map(int prog_fd, int map_fd, 1346 const struct bpf_prog_bind_opts *opts) 1347 { 1348 const size_t attr_sz = offsetofend(union bpf_attr, prog_bind_map); 1349 union bpf_attr attr; 1350 int ret; 1351 1352 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 1353 return libbpf_err(-EINVAL); 1354 1355 memset(&attr, 0, attr_sz); 1356 attr.prog_bind_map.prog_fd = prog_fd; 1357 attr.prog_bind_map.map_fd = map_fd; 1358 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 1359 1360 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz); 1361 return libbpf_err_errno(ret); 1362 } 1363 1364 int bpf_token_create(int bpffs_fd, struct bpf_token_create_opts *opts) 1365 { 1366 const size_t attr_sz = offsetofend(union bpf_attr, token_create); 1367 union bpf_attr attr; 1368 int fd; 1369 1370 if (!OPTS_VALID(opts, bpf_token_create_opts)) 1371 return libbpf_err(-EINVAL); 1372 1373 memset(&attr, 0, attr_sz); 1374 attr.token_create.bpffs_fd = bpffs_fd; 1375 attr.token_create.flags = OPTS_GET(opts, flags, 0); 1376 1377 fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz); 1378 return libbpf_err_errno(fd); 1379 } 1380 1381 int bpf_prog_stream_read(int prog_fd, __u32 stream_id, void *buf, __u32 buf_len, 1382 struct bpf_prog_stream_read_opts *opts) 1383 { 1384 const size_t attr_sz = offsetofend(union bpf_attr, prog_stream_read); 1385 union bpf_attr attr; 1386 int err; 1387 1388 if (!OPTS_VALID(opts, bpf_prog_stream_read_opts)) 1389 return libbpf_err(-EINVAL); 1390 1391 memset(&attr, 0, attr_sz); 1392 attr.prog_stream_read.stream_buf = ptr_to_u64(buf); 1393 attr.prog_stream_read.stream_buf_len = buf_len; 1394 attr.prog_stream_read.stream_id = stream_id; 1395 attr.prog_stream_read.prog_fd = prog_fd; 1396 1397 err = sys_bpf(BPF_PROG_STREAM_READ_BY_FD, &attr, attr_sz); 1398 return libbpf_err_errno(err); 1399 } 1400