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