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, attach_btf_obj_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, map_token_fd); 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); 206 207 fd = sys_bpf_fd(BPF_MAP_CREATE, &attr, attr_sz); 208 return libbpf_err_errno(fd); 209 } 210 211 static void * 212 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 213 __u32 actual_rec_size, __u32 expected_rec_size) 214 { 215 __u64 info_len = (__u64)actual_rec_size * cnt; 216 void *info, *nrecord; 217 int i; 218 219 info = malloc(info_len); 220 if (!info) 221 return NULL; 222 223 /* zero out bytes kernel does not understand */ 224 nrecord = info; 225 for (i = 0; i < cnt; i++) { 226 memcpy(nrecord, orecord, expected_rec_size); 227 memset(nrecord + expected_rec_size, 0, 228 actual_rec_size - expected_rec_size); 229 orecord += actual_rec_size; 230 nrecord += actual_rec_size; 231 } 232 233 return info; 234 } 235 236 int bpf_prog_load(enum bpf_prog_type prog_type, 237 const char *prog_name, const char *license, 238 const struct bpf_insn *insns, size_t insn_cnt, 239 struct bpf_prog_load_opts *opts) 240 { 241 const size_t attr_sz = offsetofend(union bpf_attr, prog_token_fd); 242 void *finfo = NULL, *linfo = NULL; 243 const char *func_info, *line_info; 244 __u32 log_size, log_level, attach_prog_fd, attach_btf_obj_fd; 245 __u32 func_info_rec_size, line_info_rec_size; 246 int fd, attempts; 247 union bpf_attr attr; 248 char *log_buf; 249 250 bump_rlimit_memlock(); 251 252 if (!OPTS_VALID(opts, bpf_prog_load_opts)) 253 return libbpf_err(-EINVAL); 254 255 attempts = OPTS_GET(opts, attempts, 0); 256 if (attempts < 0) 257 return libbpf_err(-EINVAL); 258 if (attempts == 0) 259 attempts = PROG_LOAD_ATTEMPTS; 260 261 memset(&attr, 0, attr_sz); 262 263 attr.prog_type = prog_type; 264 attr.expected_attach_type = OPTS_GET(opts, expected_attach_type, 0); 265 266 attr.prog_btf_fd = OPTS_GET(opts, prog_btf_fd, 0); 267 attr.prog_flags = OPTS_GET(opts, prog_flags, 0); 268 attr.prog_ifindex = OPTS_GET(opts, prog_ifindex, 0); 269 attr.kern_version = OPTS_GET(opts, kern_version, 0); 270 attr.prog_token_fd = OPTS_GET(opts, token_fd, 0); 271 272 if (prog_name && feat_supported(NULL, FEAT_PROG_NAME)) 273 libbpf_strlcpy(attr.prog_name, prog_name, sizeof(attr.prog_name)); 274 attr.license = ptr_to_u64(license); 275 276 if (insn_cnt > UINT_MAX) 277 return libbpf_err(-E2BIG); 278 279 attr.insns = ptr_to_u64(insns); 280 attr.insn_cnt = (__u32)insn_cnt; 281 282 attach_prog_fd = OPTS_GET(opts, attach_prog_fd, 0); 283 attach_btf_obj_fd = OPTS_GET(opts, attach_btf_obj_fd, 0); 284 285 if (attach_prog_fd && attach_btf_obj_fd) 286 return libbpf_err(-EINVAL); 287 288 attr.attach_btf_id = OPTS_GET(opts, attach_btf_id, 0); 289 if (attach_prog_fd) 290 attr.attach_prog_fd = attach_prog_fd; 291 else 292 attr.attach_btf_obj_fd = attach_btf_obj_fd; 293 294 log_buf = OPTS_GET(opts, log_buf, NULL); 295 log_size = OPTS_GET(opts, log_size, 0); 296 log_level = OPTS_GET(opts, log_level, 0); 297 298 if (!!log_buf != !!log_size) 299 return libbpf_err(-EINVAL); 300 301 func_info_rec_size = OPTS_GET(opts, func_info_rec_size, 0); 302 func_info = OPTS_GET(opts, func_info, NULL); 303 attr.func_info_rec_size = func_info_rec_size; 304 attr.func_info = ptr_to_u64(func_info); 305 attr.func_info_cnt = OPTS_GET(opts, func_info_cnt, 0); 306 307 line_info_rec_size = OPTS_GET(opts, line_info_rec_size, 0); 308 line_info = OPTS_GET(opts, line_info, NULL); 309 attr.line_info_rec_size = line_info_rec_size; 310 attr.line_info = ptr_to_u64(line_info); 311 attr.line_info_cnt = OPTS_GET(opts, line_info_cnt, 0); 312 313 attr.fd_array = ptr_to_u64(OPTS_GET(opts, fd_array, NULL)); 314 315 if (log_level) { 316 attr.log_buf = ptr_to_u64(log_buf); 317 attr.log_size = log_size; 318 attr.log_level = log_level; 319 } 320 321 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 322 OPTS_SET(opts, log_true_size, attr.log_true_size); 323 if (fd >= 0) 324 return fd; 325 326 /* After bpf_prog_load, the kernel may modify certain attributes 327 * to give user space a hint how to deal with loading failure. 328 * Check to see whether we can make some changes and load again. 329 */ 330 while (errno == E2BIG && (!finfo || !linfo)) { 331 if (!finfo && attr.func_info_cnt && 332 attr.func_info_rec_size < func_info_rec_size) { 333 /* try with corrected func info records */ 334 finfo = alloc_zero_tailing_info(func_info, 335 attr.func_info_cnt, 336 func_info_rec_size, 337 attr.func_info_rec_size); 338 if (!finfo) { 339 errno = E2BIG; 340 goto done; 341 } 342 343 attr.func_info = ptr_to_u64(finfo); 344 attr.func_info_rec_size = func_info_rec_size; 345 } else if (!linfo && attr.line_info_cnt && 346 attr.line_info_rec_size < line_info_rec_size) { 347 linfo = alloc_zero_tailing_info(line_info, 348 attr.line_info_cnt, 349 line_info_rec_size, 350 attr.line_info_rec_size); 351 if (!linfo) { 352 errno = E2BIG; 353 goto done; 354 } 355 356 attr.line_info = ptr_to_u64(linfo); 357 attr.line_info_rec_size = line_info_rec_size; 358 } else { 359 break; 360 } 361 362 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 363 OPTS_SET(opts, log_true_size, attr.log_true_size); 364 if (fd >= 0) 365 goto done; 366 } 367 368 if (log_level == 0 && log_buf) { 369 /* log_level == 0 with non-NULL log_buf requires retrying on error 370 * with log_level == 1 and log_buf/log_buf_size set, to get details of 371 * failure 372 */ 373 attr.log_buf = ptr_to_u64(log_buf); 374 attr.log_size = log_size; 375 attr.log_level = 1; 376 377 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 378 OPTS_SET(opts, log_true_size, attr.log_true_size); 379 } 380 done: 381 /* free() doesn't affect errno, so we don't need to restore it */ 382 free(finfo); 383 free(linfo); 384 return libbpf_err_errno(fd); 385 } 386 387 int bpf_map_update_elem(int fd, const void *key, const void *value, 388 __u64 flags) 389 { 390 const size_t attr_sz = offsetofend(union bpf_attr, flags); 391 union bpf_attr attr; 392 int ret; 393 394 memset(&attr, 0, attr_sz); 395 attr.map_fd = fd; 396 attr.key = ptr_to_u64(key); 397 attr.value = ptr_to_u64(value); 398 attr.flags = flags; 399 400 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, attr_sz); 401 return libbpf_err_errno(ret); 402 } 403 404 int bpf_map_lookup_elem(int fd, const void *key, void *value) 405 { 406 const size_t attr_sz = offsetofend(union bpf_attr, flags); 407 union bpf_attr attr; 408 int ret; 409 410 memset(&attr, 0, attr_sz); 411 attr.map_fd = fd; 412 attr.key = ptr_to_u64(key); 413 attr.value = ptr_to_u64(value); 414 415 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz); 416 return libbpf_err_errno(ret); 417 } 418 419 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 420 { 421 const size_t attr_sz = offsetofend(union bpf_attr, flags); 422 union bpf_attr attr; 423 int ret; 424 425 memset(&attr, 0, attr_sz); 426 attr.map_fd = fd; 427 attr.key = ptr_to_u64(key); 428 attr.value = ptr_to_u64(value); 429 attr.flags = flags; 430 431 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz); 432 return libbpf_err_errno(ret); 433 } 434 435 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 436 { 437 const size_t attr_sz = offsetofend(union bpf_attr, flags); 438 union bpf_attr attr; 439 int ret; 440 441 memset(&attr, 0, attr_sz); 442 attr.map_fd = fd; 443 attr.key = ptr_to_u64(key); 444 attr.value = ptr_to_u64(value); 445 446 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz); 447 return libbpf_err_errno(ret); 448 } 449 450 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags) 451 { 452 const size_t attr_sz = offsetofend(union bpf_attr, flags); 453 union bpf_attr attr; 454 int ret; 455 456 memset(&attr, 0, attr_sz); 457 attr.map_fd = fd; 458 attr.key = ptr_to_u64(key); 459 attr.value = ptr_to_u64(value); 460 attr.flags = flags; 461 462 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz); 463 return libbpf_err_errno(ret); 464 } 465 466 int bpf_map_delete_elem(int fd, const void *key) 467 { 468 const size_t attr_sz = offsetofend(union bpf_attr, flags); 469 union bpf_attr attr; 470 int ret; 471 472 memset(&attr, 0, attr_sz); 473 attr.map_fd = fd; 474 attr.key = ptr_to_u64(key); 475 476 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz); 477 return libbpf_err_errno(ret); 478 } 479 480 int bpf_map_delete_elem_flags(int fd, const void *key, __u64 flags) 481 { 482 const size_t attr_sz = offsetofend(union bpf_attr, flags); 483 union bpf_attr attr; 484 int ret; 485 486 memset(&attr, 0, attr_sz); 487 attr.map_fd = fd; 488 attr.key = ptr_to_u64(key); 489 attr.flags = flags; 490 491 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz); 492 return libbpf_err_errno(ret); 493 } 494 495 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 496 { 497 const size_t attr_sz = offsetofend(union bpf_attr, next_key); 498 union bpf_attr attr; 499 int ret; 500 501 memset(&attr, 0, attr_sz); 502 attr.map_fd = fd; 503 attr.key = ptr_to_u64(key); 504 attr.next_key = ptr_to_u64(next_key); 505 506 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, attr_sz); 507 return libbpf_err_errno(ret); 508 } 509 510 int bpf_map_freeze(int fd) 511 { 512 const size_t attr_sz = offsetofend(union bpf_attr, map_fd); 513 union bpf_attr attr; 514 int ret; 515 516 memset(&attr, 0, attr_sz); 517 attr.map_fd = fd; 518 519 ret = sys_bpf(BPF_MAP_FREEZE, &attr, attr_sz); 520 return libbpf_err_errno(ret); 521 } 522 523 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 524 void *out_batch, void *keys, void *values, 525 __u32 *count, 526 const struct bpf_map_batch_opts *opts) 527 { 528 const size_t attr_sz = offsetofend(union bpf_attr, batch); 529 union bpf_attr attr; 530 int ret; 531 532 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 533 return libbpf_err(-EINVAL); 534 535 memset(&attr, 0, attr_sz); 536 attr.batch.map_fd = fd; 537 attr.batch.in_batch = ptr_to_u64(in_batch); 538 attr.batch.out_batch = ptr_to_u64(out_batch); 539 attr.batch.keys = ptr_to_u64(keys); 540 attr.batch.values = ptr_to_u64(values); 541 attr.batch.count = *count; 542 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 543 attr.batch.flags = OPTS_GET(opts, flags, 0); 544 545 ret = sys_bpf(cmd, &attr, attr_sz); 546 *count = attr.batch.count; 547 548 return libbpf_err_errno(ret); 549 } 550 551 int bpf_map_delete_batch(int fd, const void *keys, __u32 *count, 552 const struct bpf_map_batch_opts *opts) 553 { 554 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 555 NULL, (void *)keys, NULL, count, opts); 556 } 557 558 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 559 void *values, __u32 *count, 560 const struct bpf_map_batch_opts *opts) 561 { 562 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 563 out_batch, keys, values, count, opts); 564 } 565 566 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 567 void *keys, void *values, __u32 *count, 568 const struct bpf_map_batch_opts *opts) 569 { 570 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 571 fd, in_batch, out_batch, keys, values, 572 count, opts); 573 } 574 575 int bpf_map_update_batch(int fd, const void *keys, const void *values, __u32 *count, 576 const struct bpf_map_batch_opts *opts) 577 { 578 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 579 (void *)keys, (void *)values, count, opts); 580 } 581 582 int bpf_obj_pin_opts(int fd, const char *pathname, const struct bpf_obj_pin_opts *opts) 583 { 584 const size_t attr_sz = offsetofend(union bpf_attr, path_fd); 585 union bpf_attr attr; 586 int ret; 587 588 if (!OPTS_VALID(opts, bpf_obj_pin_opts)) 589 return libbpf_err(-EINVAL); 590 591 memset(&attr, 0, attr_sz); 592 attr.path_fd = OPTS_GET(opts, path_fd, 0); 593 attr.pathname = ptr_to_u64((void *)pathname); 594 attr.file_flags = OPTS_GET(opts, file_flags, 0); 595 attr.bpf_fd = fd; 596 597 ret = sys_bpf(BPF_OBJ_PIN, &attr, attr_sz); 598 return libbpf_err_errno(ret); 599 } 600 601 int bpf_obj_pin(int fd, const char *pathname) 602 { 603 return bpf_obj_pin_opts(fd, pathname, NULL); 604 } 605 606 int bpf_obj_get(const char *pathname) 607 { 608 return bpf_obj_get_opts(pathname, NULL); 609 } 610 611 int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts) 612 { 613 const size_t attr_sz = offsetofend(union bpf_attr, path_fd); 614 union bpf_attr attr; 615 int fd; 616 617 if (!OPTS_VALID(opts, bpf_obj_get_opts)) 618 return libbpf_err(-EINVAL); 619 620 memset(&attr, 0, attr_sz); 621 attr.path_fd = OPTS_GET(opts, path_fd, 0); 622 attr.pathname = ptr_to_u64((void *)pathname); 623 attr.file_flags = OPTS_GET(opts, file_flags, 0); 624 625 fd = sys_bpf_fd(BPF_OBJ_GET, &attr, attr_sz); 626 return libbpf_err_errno(fd); 627 } 628 629 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 630 unsigned int flags) 631 { 632 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 633 .flags = flags, 634 ); 635 636 return bpf_prog_attach_opts(prog_fd, target_fd, type, &opts); 637 } 638 639 int bpf_prog_attach_opts(int prog_fd, int target, enum bpf_attach_type type, 640 const struct bpf_prog_attach_opts *opts) 641 { 642 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision); 643 __u32 relative_id, flags; 644 int ret, relative_fd; 645 union bpf_attr attr; 646 647 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 648 return libbpf_err(-EINVAL); 649 650 relative_id = OPTS_GET(opts, relative_id, 0); 651 relative_fd = OPTS_GET(opts, relative_fd, 0); 652 flags = OPTS_GET(opts, flags, 0); 653 654 /* validate we don't have unexpected combinations of non-zero fields */ 655 if (relative_fd && relative_id) 656 return libbpf_err(-EINVAL); 657 658 memset(&attr, 0, attr_sz); 659 attr.target_fd = target; 660 attr.attach_bpf_fd = prog_fd; 661 attr.attach_type = type; 662 attr.replace_bpf_fd = OPTS_GET(opts, replace_fd, 0); 663 attr.expected_revision = OPTS_GET(opts, expected_revision, 0); 664 665 if (relative_id) { 666 attr.attach_flags = flags | BPF_F_ID; 667 attr.relative_id = relative_id; 668 } else { 669 attr.attach_flags = flags; 670 attr.relative_fd = relative_fd; 671 } 672 673 ret = sys_bpf(BPF_PROG_ATTACH, &attr, attr_sz); 674 return libbpf_err_errno(ret); 675 } 676 677 int bpf_prog_detach_opts(int prog_fd, int target, enum bpf_attach_type type, 678 const struct bpf_prog_detach_opts *opts) 679 { 680 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision); 681 __u32 relative_id, flags; 682 int ret, relative_fd; 683 union bpf_attr attr; 684 685 if (!OPTS_VALID(opts, bpf_prog_detach_opts)) 686 return libbpf_err(-EINVAL); 687 688 relative_id = OPTS_GET(opts, relative_id, 0); 689 relative_fd = OPTS_GET(opts, relative_fd, 0); 690 flags = OPTS_GET(opts, flags, 0); 691 692 /* validate we don't have unexpected combinations of non-zero fields */ 693 if (relative_fd && relative_id) 694 return libbpf_err(-EINVAL); 695 696 memset(&attr, 0, attr_sz); 697 attr.target_fd = target; 698 attr.attach_bpf_fd = prog_fd; 699 attr.attach_type = type; 700 attr.expected_revision = OPTS_GET(opts, expected_revision, 0); 701 702 if (relative_id) { 703 attr.attach_flags = flags | BPF_F_ID; 704 attr.relative_id = relative_id; 705 } else { 706 attr.attach_flags = flags; 707 attr.relative_fd = relative_fd; 708 } 709 710 ret = sys_bpf(BPF_PROG_DETACH, &attr, attr_sz); 711 return libbpf_err_errno(ret); 712 } 713 714 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 715 { 716 return bpf_prog_detach_opts(0, target_fd, type, NULL); 717 } 718 719 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 720 { 721 return bpf_prog_detach_opts(prog_fd, target_fd, type, NULL); 722 } 723 724 int bpf_link_create(int prog_fd, int target_fd, 725 enum bpf_attach_type attach_type, 726 const struct bpf_link_create_opts *opts) 727 { 728 const size_t attr_sz = offsetofend(union bpf_attr, link_create); 729 __u32 target_btf_id, iter_info_len, relative_id; 730 int fd, err, relative_fd; 731 union bpf_attr attr; 732 733 if (!OPTS_VALID(opts, bpf_link_create_opts)) 734 return libbpf_err(-EINVAL); 735 736 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 737 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 738 739 /* validate we don't have unexpected combinations of non-zero fields */ 740 if (iter_info_len || target_btf_id) { 741 if (iter_info_len && target_btf_id) 742 return libbpf_err(-EINVAL); 743 if (!OPTS_ZEROED(opts, target_btf_id)) 744 return libbpf_err(-EINVAL); 745 } 746 747 memset(&attr, 0, attr_sz); 748 attr.link_create.prog_fd = prog_fd; 749 attr.link_create.target_fd = target_fd; 750 attr.link_create.attach_type = attach_type; 751 attr.link_create.flags = OPTS_GET(opts, flags, 0); 752 753 if (target_btf_id) { 754 attr.link_create.target_btf_id = target_btf_id; 755 goto proceed; 756 } 757 758 switch (attach_type) { 759 case BPF_TRACE_ITER: 760 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 761 attr.link_create.iter_info_len = iter_info_len; 762 break; 763 case BPF_PERF_EVENT: 764 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0); 765 if (!OPTS_ZEROED(opts, perf_event)) 766 return libbpf_err(-EINVAL); 767 break; 768 case BPF_TRACE_KPROBE_MULTI: 769 attr.link_create.kprobe_multi.flags = OPTS_GET(opts, kprobe_multi.flags, 0); 770 attr.link_create.kprobe_multi.cnt = OPTS_GET(opts, kprobe_multi.cnt, 0); 771 attr.link_create.kprobe_multi.syms = ptr_to_u64(OPTS_GET(opts, kprobe_multi.syms, 0)); 772 attr.link_create.kprobe_multi.addrs = ptr_to_u64(OPTS_GET(opts, kprobe_multi.addrs, 0)); 773 attr.link_create.kprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, kprobe_multi.cookies, 0)); 774 if (!OPTS_ZEROED(opts, kprobe_multi)) 775 return libbpf_err(-EINVAL); 776 break; 777 case BPF_TRACE_UPROBE_MULTI: 778 attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0); 779 attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0); 780 attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0)); 781 attr.link_create.uprobe_multi.offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.offsets, 0)); 782 attr.link_create.uprobe_multi.ref_ctr_offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.ref_ctr_offsets, 0)); 783 attr.link_create.uprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, uprobe_multi.cookies, 0)); 784 attr.link_create.uprobe_multi.pid = OPTS_GET(opts, uprobe_multi.pid, 0); 785 if (!OPTS_ZEROED(opts, uprobe_multi)) 786 return libbpf_err(-EINVAL); 787 break; 788 case BPF_TRACE_FENTRY: 789 case BPF_TRACE_FEXIT: 790 case BPF_MODIFY_RETURN: 791 case BPF_LSM_MAC: 792 attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0); 793 if (!OPTS_ZEROED(opts, tracing)) 794 return libbpf_err(-EINVAL); 795 break; 796 case BPF_NETFILTER: 797 attr.link_create.netfilter.pf = OPTS_GET(opts, netfilter.pf, 0); 798 attr.link_create.netfilter.hooknum = OPTS_GET(opts, netfilter.hooknum, 0); 799 attr.link_create.netfilter.priority = OPTS_GET(opts, netfilter.priority, 0); 800 attr.link_create.netfilter.flags = OPTS_GET(opts, netfilter.flags, 0); 801 if (!OPTS_ZEROED(opts, netfilter)) 802 return libbpf_err(-EINVAL); 803 break; 804 case BPF_TCX_INGRESS: 805 case BPF_TCX_EGRESS: 806 relative_fd = OPTS_GET(opts, tcx.relative_fd, 0); 807 relative_id = OPTS_GET(opts, tcx.relative_id, 0); 808 if (relative_fd && relative_id) 809 return libbpf_err(-EINVAL); 810 if (relative_id) { 811 attr.link_create.tcx.relative_id = relative_id; 812 attr.link_create.flags |= BPF_F_ID; 813 } else { 814 attr.link_create.tcx.relative_fd = relative_fd; 815 } 816 attr.link_create.tcx.expected_revision = OPTS_GET(opts, tcx.expected_revision, 0); 817 if (!OPTS_ZEROED(opts, tcx)) 818 return libbpf_err(-EINVAL); 819 break; 820 case BPF_NETKIT_PRIMARY: 821 case BPF_NETKIT_PEER: 822 relative_fd = OPTS_GET(opts, netkit.relative_fd, 0); 823 relative_id = OPTS_GET(opts, netkit.relative_id, 0); 824 if (relative_fd && relative_id) 825 return libbpf_err(-EINVAL); 826 if (relative_id) { 827 attr.link_create.netkit.relative_id = relative_id; 828 attr.link_create.flags |= BPF_F_ID; 829 } else { 830 attr.link_create.netkit.relative_fd = relative_fd; 831 } 832 attr.link_create.netkit.expected_revision = OPTS_GET(opts, netkit.expected_revision, 0); 833 if (!OPTS_ZEROED(opts, netkit)) 834 return libbpf_err(-EINVAL); 835 break; 836 default: 837 if (!OPTS_ZEROED(opts, flags)) 838 return libbpf_err(-EINVAL); 839 break; 840 } 841 proceed: 842 fd = sys_bpf_fd(BPF_LINK_CREATE, &attr, attr_sz); 843 if (fd >= 0) 844 return fd; 845 /* we'll get EINVAL if LINK_CREATE doesn't support attaching fentry 846 * and other similar programs 847 */ 848 err = -errno; 849 if (err != -EINVAL) 850 return libbpf_err(err); 851 852 /* if user used features not supported by 853 * BPF_RAW_TRACEPOINT_OPEN command, then just give up immediately 854 */ 855 if (attr.link_create.target_fd || attr.link_create.target_btf_id) 856 return libbpf_err(err); 857 if (!OPTS_ZEROED(opts, sz)) 858 return libbpf_err(err); 859 860 /* otherwise, for few select kinds of programs that can be 861 * attached using BPF_RAW_TRACEPOINT_OPEN command, try that as 862 * a fallback for older kernels 863 */ 864 switch (attach_type) { 865 case BPF_TRACE_RAW_TP: 866 case BPF_LSM_MAC: 867 case BPF_TRACE_FENTRY: 868 case BPF_TRACE_FEXIT: 869 case BPF_MODIFY_RETURN: 870 return bpf_raw_tracepoint_open(NULL, prog_fd); 871 default: 872 return libbpf_err(err); 873 } 874 } 875 876 int bpf_link_detach(int link_fd) 877 { 878 const size_t attr_sz = offsetofend(union bpf_attr, link_detach); 879 union bpf_attr attr; 880 int ret; 881 882 memset(&attr, 0, attr_sz); 883 attr.link_detach.link_fd = link_fd; 884 885 ret = sys_bpf(BPF_LINK_DETACH, &attr, attr_sz); 886 return libbpf_err_errno(ret); 887 } 888 889 int bpf_link_update(int link_fd, int new_prog_fd, 890 const struct bpf_link_update_opts *opts) 891 { 892 const size_t attr_sz = offsetofend(union bpf_attr, link_update); 893 union bpf_attr attr; 894 int ret; 895 896 if (!OPTS_VALID(opts, bpf_link_update_opts)) 897 return libbpf_err(-EINVAL); 898 899 if (OPTS_GET(opts, old_prog_fd, 0) && OPTS_GET(opts, old_map_fd, 0)) 900 return libbpf_err(-EINVAL); 901 902 memset(&attr, 0, attr_sz); 903 attr.link_update.link_fd = link_fd; 904 attr.link_update.new_prog_fd = new_prog_fd; 905 attr.link_update.flags = OPTS_GET(opts, flags, 0); 906 if (OPTS_GET(opts, old_prog_fd, 0)) 907 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 908 else if (OPTS_GET(opts, old_map_fd, 0)) 909 attr.link_update.old_map_fd = OPTS_GET(opts, old_map_fd, 0); 910 911 ret = sys_bpf(BPF_LINK_UPDATE, &attr, attr_sz); 912 return libbpf_err_errno(ret); 913 } 914 915 int bpf_iter_create(int link_fd) 916 { 917 const size_t attr_sz = offsetofend(union bpf_attr, iter_create); 918 union bpf_attr attr; 919 int fd; 920 921 memset(&attr, 0, attr_sz); 922 attr.iter_create.link_fd = link_fd; 923 924 fd = sys_bpf_fd(BPF_ITER_CREATE, &attr, attr_sz); 925 return libbpf_err_errno(fd); 926 } 927 928 int bpf_prog_query_opts(int target, enum bpf_attach_type type, 929 struct bpf_prog_query_opts *opts) 930 { 931 const size_t attr_sz = offsetofend(union bpf_attr, query); 932 union bpf_attr attr; 933 int ret; 934 935 if (!OPTS_VALID(opts, bpf_prog_query_opts)) 936 return libbpf_err(-EINVAL); 937 938 memset(&attr, 0, attr_sz); 939 attr.query.target_fd = target; 940 attr.query.attach_type = type; 941 attr.query.query_flags = OPTS_GET(opts, query_flags, 0); 942 attr.query.count = OPTS_GET(opts, count, 0); 943 attr.query.prog_ids = ptr_to_u64(OPTS_GET(opts, prog_ids, NULL)); 944 attr.query.link_ids = ptr_to_u64(OPTS_GET(opts, link_ids, NULL)); 945 attr.query.prog_attach_flags = ptr_to_u64(OPTS_GET(opts, prog_attach_flags, NULL)); 946 attr.query.link_attach_flags = ptr_to_u64(OPTS_GET(opts, link_attach_flags, NULL)); 947 948 ret = sys_bpf(BPF_PROG_QUERY, &attr, attr_sz); 949 950 OPTS_SET(opts, attach_flags, attr.query.attach_flags); 951 OPTS_SET(opts, revision, attr.query.revision); 952 OPTS_SET(opts, count, attr.query.count); 953 954 return libbpf_err_errno(ret); 955 } 956 957 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 958 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 959 { 960 LIBBPF_OPTS(bpf_prog_query_opts, opts); 961 int ret; 962 963 opts.query_flags = query_flags; 964 opts.prog_ids = prog_ids; 965 opts.prog_cnt = *prog_cnt; 966 967 ret = bpf_prog_query_opts(target_fd, type, &opts); 968 969 if (attach_flags) 970 *attach_flags = opts.attach_flags; 971 *prog_cnt = opts.prog_cnt; 972 973 return libbpf_err_errno(ret); 974 } 975 976 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 977 { 978 const size_t attr_sz = offsetofend(union bpf_attr, test); 979 union bpf_attr attr; 980 int ret; 981 982 if (!OPTS_VALID(opts, bpf_test_run_opts)) 983 return libbpf_err(-EINVAL); 984 985 memset(&attr, 0, attr_sz); 986 attr.test.prog_fd = prog_fd; 987 attr.test.batch_size = OPTS_GET(opts, batch_size, 0); 988 attr.test.cpu = OPTS_GET(opts, cpu, 0); 989 attr.test.flags = OPTS_GET(opts, flags, 0); 990 attr.test.repeat = OPTS_GET(opts, repeat, 0); 991 attr.test.duration = OPTS_GET(opts, duration, 0); 992 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 993 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 994 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 995 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 996 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 997 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 998 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 999 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 1000 1001 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, attr_sz); 1002 1003 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 1004 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 1005 OPTS_SET(opts, duration, attr.test.duration); 1006 OPTS_SET(opts, retval, attr.test.retval); 1007 1008 return libbpf_err_errno(ret); 1009 } 1010 1011 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 1012 { 1013 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1014 union bpf_attr attr; 1015 int err; 1016 1017 memset(&attr, 0, attr_sz); 1018 attr.start_id = start_id; 1019 1020 err = sys_bpf(cmd, &attr, attr_sz); 1021 if (!err) 1022 *next_id = attr.next_id; 1023 1024 return libbpf_err_errno(err); 1025 } 1026 1027 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 1028 { 1029 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 1030 } 1031 1032 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 1033 { 1034 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 1035 } 1036 1037 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 1038 { 1039 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 1040 } 1041 1042 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 1043 { 1044 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 1045 } 1046 1047 int bpf_prog_get_fd_by_id_opts(__u32 id, 1048 const struct bpf_get_fd_by_id_opts *opts) 1049 { 1050 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1051 union bpf_attr attr; 1052 int fd; 1053 1054 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1055 return libbpf_err(-EINVAL); 1056 1057 memset(&attr, 0, attr_sz); 1058 attr.prog_id = id; 1059 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1060 1061 fd = sys_bpf_fd(BPF_PROG_GET_FD_BY_ID, &attr, attr_sz); 1062 return libbpf_err_errno(fd); 1063 } 1064 1065 int bpf_prog_get_fd_by_id(__u32 id) 1066 { 1067 return bpf_prog_get_fd_by_id_opts(id, NULL); 1068 } 1069 1070 int bpf_map_get_fd_by_id_opts(__u32 id, 1071 const struct bpf_get_fd_by_id_opts *opts) 1072 { 1073 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1074 union bpf_attr attr; 1075 int fd; 1076 1077 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1078 return libbpf_err(-EINVAL); 1079 1080 memset(&attr, 0, attr_sz); 1081 attr.map_id = id; 1082 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1083 1084 fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, attr_sz); 1085 return libbpf_err_errno(fd); 1086 } 1087 1088 int bpf_map_get_fd_by_id(__u32 id) 1089 { 1090 return bpf_map_get_fd_by_id_opts(id, NULL); 1091 } 1092 1093 int bpf_btf_get_fd_by_id_opts(__u32 id, 1094 const struct bpf_get_fd_by_id_opts *opts) 1095 { 1096 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1097 union bpf_attr attr; 1098 int fd; 1099 1100 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1101 return libbpf_err(-EINVAL); 1102 1103 memset(&attr, 0, attr_sz); 1104 attr.btf_id = id; 1105 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1106 1107 fd = sys_bpf_fd(BPF_BTF_GET_FD_BY_ID, &attr, attr_sz); 1108 return libbpf_err_errno(fd); 1109 } 1110 1111 int bpf_btf_get_fd_by_id(__u32 id) 1112 { 1113 return bpf_btf_get_fd_by_id_opts(id, NULL); 1114 } 1115 1116 int bpf_link_get_fd_by_id_opts(__u32 id, 1117 const struct bpf_get_fd_by_id_opts *opts) 1118 { 1119 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1120 union bpf_attr attr; 1121 int fd; 1122 1123 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1124 return libbpf_err(-EINVAL); 1125 1126 memset(&attr, 0, attr_sz); 1127 attr.link_id = id; 1128 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1129 1130 fd = sys_bpf_fd(BPF_LINK_GET_FD_BY_ID, &attr, attr_sz); 1131 return libbpf_err_errno(fd); 1132 } 1133 1134 int bpf_link_get_fd_by_id(__u32 id) 1135 { 1136 return bpf_link_get_fd_by_id_opts(id, NULL); 1137 } 1138 1139 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 1140 { 1141 const size_t attr_sz = offsetofend(union bpf_attr, info); 1142 union bpf_attr attr; 1143 int err; 1144 1145 memset(&attr, 0, attr_sz); 1146 attr.info.bpf_fd = bpf_fd; 1147 attr.info.info_len = *info_len; 1148 attr.info.info = ptr_to_u64(info); 1149 1150 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, attr_sz); 1151 if (!err) 1152 *info_len = attr.info.info_len; 1153 return libbpf_err_errno(err); 1154 } 1155 1156 int bpf_prog_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, __u32 *info_len) 1157 { 1158 return bpf_obj_get_info_by_fd(prog_fd, info, info_len); 1159 } 1160 1161 int bpf_map_get_info_by_fd(int map_fd, struct bpf_map_info *info, __u32 *info_len) 1162 { 1163 return bpf_obj_get_info_by_fd(map_fd, info, info_len); 1164 } 1165 1166 int bpf_btf_get_info_by_fd(int btf_fd, struct bpf_btf_info *info, __u32 *info_len) 1167 { 1168 return bpf_obj_get_info_by_fd(btf_fd, info, info_len); 1169 } 1170 1171 int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len) 1172 { 1173 return bpf_obj_get_info_by_fd(link_fd, info, info_len); 1174 } 1175 1176 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 1177 { 1178 const size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint); 1179 union bpf_attr attr; 1180 int fd; 1181 1182 memset(&attr, 0, attr_sz); 1183 attr.raw_tracepoint.name = ptr_to_u64(name); 1184 attr.raw_tracepoint.prog_fd = prog_fd; 1185 1186 fd = sys_bpf_fd(BPF_RAW_TRACEPOINT_OPEN, &attr, attr_sz); 1187 return libbpf_err_errno(fd); 1188 } 1189 1190 int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts) 1191 { 1192 const size_t attr_sz = offsetofend(union bpf_attr, btf_token_fd); 1193 union bpf_attr attr; 1194 char *log_buf; 1195 size_t log_size; 1196 __u32 log_level; 1197 int fd; 1198 1199 bump_rlimit_memlock(); 1200 1201 memset(&attr, 0, attr_sz); 1202 1203 if (!OPTS_VALID(opts, bpf_btf_load_opts)) 1204 return libbpf_err(-EINVAL); 1205 1206 log_buf = OPTS_GET(opts, log_buf, NULL); 1207 log_size = OPTS_GET(opts, log_size, 0); 1208 log_level = OPTS_GET(opts, log_level, 0); 1209 1210 if (log_size > UINT_MAX) 1211 return libbpf_err(-EINVAL); 1212 if (log_size && !log_buf) 1213 return libbpf_err(-EINVAL); 1214 1215 attr.btf = ptr_to_u64(btf_data); 1216 attr.btf_size = btf_size; 1217 1218 attr.btf_flags = OPTS_GET(opts, btf_flags, 0); 1219 attr.btf_token_fd = OPTS_GET(opts, token_fd, 0); 1220 1221 /* log_level == 0 and log_buf != NULL means "try loading without 1222 * log_buf, but retry with log_buf and log_level=1 on error", which is 1223 * consistent across low-level and high-level BTF and program loading 1224 * APIs within libbpf and provides a sensible behavior in practice 1225 */ 1226 if (log_level) { 1227 attr.btf_log_buf = ptr_to_u64(log_buf); 1228 attr.btf_log_size = (__u32)log_size; 1229 attr.btf_log_level = log_level; 1230 } 1231 1232 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz); 1233 if (fd < 0 && log_buf && log_level == 0) { 1234 attr.btf_log_buf = ptr_to_u64(log_buf); 1235 attr.btf_log_size = (__u32)log_size; 1236 attr.btf_log_level = 1; 1237 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz); 1238 } 1239 1240 OPTS_SET(opts, log_true_size, attr.btf_log_true_size); 1241 return libbpf_err_errno(fd); 1242 } 1243 1244 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 1245 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 1246 __u64 *probe_addr) 1247 { 1248 const size_t attr_sz = offsetofend(union bpf_attr, task_fd_query); 1249 union bpf_attr attr; 1250 int err; 1251 1252 memset(&attr, 0, attr_sz); 1253 attr.task_fd_query.pid = pid; 1254 attr.task_fd_query.fd = fd; 1255 attr.task_fd_query.flags = flags; 1256 attr.task_fd_query.buf = ptr_to_u64(buf); 1257 attr.task_fd_query.buf_len = *buf_len; 1258 1259 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, attr_sz); 1260 1261 *buf_len = attr.task_fd_query.buf_len; 1262 *prog_id = attr.task_fd_query.prog_id; 1263 *fd_type = attr.task_fd_query.fd_type; 1264 *probe_offset = attr.task_fd_query.probe_offset; 1265 *probe_addr = attr.task_fd_query.probe_addr; 1266 1267 return libbpf_err_errno(err); 1268 } 1269 1270 int bpf_enable_stats(enum bpf_stats_type type) 1271 { 1272 const size_t attr_sz = offsetofend(union bpf_attr, enable_stats); 1273 union bpf_attr attr; 1274 int fd; 1275 1276 memset(&attr, 0, attr_sz); 1277 attr.enable_stats.type = type; 1278 1279 fd = sys_bpf_fd(BPF_ENABLE_STATS, &attr, attr_sz); 1280 return libbpf_err_errno(fd); 1281 } 1282 1283 int bpf_prog_bind_map(int prog_fd, int map_fd, 1284 const struct bpf_prog_bind_opts *opts) 1285 { 1286 const size_t attr_sz = offsetofend(union bpf_attr, prog_bind_map); 1287 union bpf_attr attr; 1288 int ret; 1289 1290 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 1291 return libbpf_err(-EINVAL); 1292 1293 memset(&attr, 0, attr_sz); 1294 attr.prog_bind_map.prog_fd = prog_fd; 1295 attr.prog_bind_map.map_fd = map_fd; 1296 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 1297 1298 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz); 1299 return libbpf_err_errno(ret); 1300 } 1301 1302 int bpf_token_create(int bpffs_fd, struct bpf_token_create_opts *opts) 1303 { 1304 const size_t attr_sz = offsetofend(union bpf_attr, token_create); 1305 union bpf_attr attr; 1306 int fd; 1307 1308 if (!OPTS_VALID(opts, bpf_token_create_opts)) 1309 return libbpf_err(-EINVAL); 1310 1311 memset(&attr, 0, attr_sz); 1312 attr.token_create.bpffs_fd = bpffs_fd; 1313 attr.token_create.flags = OPTS_GET(opts, flags, 0); 1314 1315 fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz); 1316 return libbpf_err_errno(fd); 1317 } 1318