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(void) 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"); 123 124 prog_fd = sys_bpf_fd(BPF_PROG_LOAD, &attr, attr_sz); 125 if (prog_fd >= 0) { 126 close(prog_fd); 127 return 1; 128 } 129 return 0; 130 } 131 132 static bool memlock_bumped; 133 static rlim_t memlock_rlim = RLIM_INFINITY; 134 135 int libbpf_set_memlock_rlim(size_t memlock_bytes) 136 { 137 if (memlock_bumped) 138 return libbpf_err(-EBUSY); 139 140 memlock_rlim = memlock_bytes; 141 return 0; 142 } 143 144 int bump_rlimit_memlock(void) 145 { 146 struct rlimit rlim; 147 148 /* if kernel supports memcg-based accounting, skip bumping RLIMIT_MEMLOCK */ 149 if (memlock_bumped || kernel_supports(NULL, FEAT_MEMCG_ACCOUNT)) 150 return 0; 151 152 memlock_bumped = true; 153 154 /* zero memlock_rlim_max disables auto-bumping RLIMIT_MEMLOCK */ 155 if (memlock_rlim == 0) 156 return 0; 157 158 rlim.rlim_cur = rlim.rlim_max = memlock_rlim; 159 if (setrlimit(RLIMIT_MEMLOCK, &rlim)) 160 return -errno; 161 162 return 0; 163 } 164 165 int bpf_map_create(enum bpf_map_type map_type, 166 const char *map_name, 167 __u32 key_size, 168 __u32 value_size, 169 __u32 max_entries, 170 const struct bpf_map_create_opts *opts) 171 { 172 const size_t attr_sz = offsetofend(union bpf_attr, map_extra); 173 union bpf_attr attr; 174 int fd; 175 176 bump_rlimit_memlock(); 177 178 memset(&attr, 0, attr_sz); 179 180 if (!OPTS_VALID(opts, bpf_map_create_opts)) 181 return libbpf_err(-EINVAL); 182 183 attr.map_type = map_type; 184 if (map_name && kernel_supports(NULL, FEAT_PROG_NAME)) 185 libbpf_strlcpy(attr.map_name, map_name, sizeof(attr.map_name)); 186 attr.key_size = key_size; 187 attr.value_size = value_size; 188 attr.max_entries = max_entries; 189 190 attr.btf_fd = OPTS_GET(opts, btf_fd, 0); 191 attr.btf_key_type_id = OPTS_GET(opts, btf_key_type_id, 0); 192 attr.btf_value_type_id = OPTS_GET(opts, btf_value_type_id, 0); 193 attr.btf_vmlinux_value_type_id = OPTS_GET(opts, btf_vmlinux_value_type_id, 0); 194 195 attr.inner_map_fd = OPTS_GET(opts, inner_map_fd, 0); 196 attr.map_flags = OPTS_GET(opts, map_flags, 0); 197 attr.map_extra = OPTS_GET(opts, map_extra, 0); 198 attr.numa_node = OPTS_GET(opts, numa_node, 0); 199 attr.map_ifindex = OPTS_GET(opts, map_ifindex, 0); 200 201 fd = sys_bpf_fd(BPF_MAP_CREATE, &attr, attr_sz); 202 return libbpf_err_errno(fd); 203 } 204 205 static void * 206 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 207 __u32 actual_rec_size, __u32 expected_rec_size) 208 { 209 __u64 info_len = (__u64)actual_rec_size * cnt; 210 void *info, *nrecord; 211 int i; 212 213 info = malloc(info_len); 214 if (!info) 215 return NULL; 216 217 /* zero out bytes kernel does not understand */ 218 nrecord = info; 219 for (i = 0; i < cnt; i++) { 220 memcpy(nrecord, orecord, expected_rec_size); 221 memset(nrecord + expected_rec_size, 0, 222 actual_rec_size - expected_rec_size); 223 orecord += actual_rec_size; 224 nrecord += actual_rec_size; 225 } 226 227 return info; 228 } 229 230 int bpf_prog_load(enum bpf_prog_type prog_type, 231 const char *prog_name, const char *license, 232 const struct bpf_insn *insns, size_t insn_cnt, 233 struct bpf_prog_load_opts *opts) 234 { 235 const size_t attr_sz = offsetofend(union bpf_attr, log_true_size); 236 void *finfo = NULL, *linfo = NULL; 237 const char *func_info, *line_info; 238 __u32 log_size, log_level, attach_prog_fd, attach_btf_obj_fd; 239 __u32 func_info_rec_size, line_info_rec_size; 240 int fd, attempts; 241 union bpf_attr attr; 242 char *log_buf; 243 244 bump_rlimit_memlock(); 245 246 if (!OPTS_VALID(opts, bpf_prog_load_opts)) 247 return libbpf_err(-EINVAL); 248 249 attempts = OPTS_GET(opts, attempts, 0); 250 if (attempts < 0) 251 return libbpf_err(-EINVAL); 252 if (attempts == 0) 253 attempts = PROG_LOAD_ATTEMPTS; 254 255 memset(&attr, 0, attr_sz); 256 257 attr.prog_type = prog_type; 258 attr.expected_attach_type = OPTS_GET(opts, expected_attach_type, 0); 259 260 attr.prog_btf_fd = OPTS_GET(opts, prog_btf_fd, 0); 261 attr.prog_flags = OPTS_GET(opts, prog_flags, 0); 262 attr.prog_ifindex = OPTS_GET(opts, prog_ifindex, 0); 263 attr.kern_version = OPTS_GET(opts, kern_version, 0); 264 265 if (prog_name && kernel_supports(NULL, FEAT_PROG_NAME)) 266 libbpf_strlcpy(attr.prog_name, prog_name, sizeof(attr.prog_name)); 267 attr.license = ptr_to_u64(license); 268 269 if (insn_cnt > UINT_MAX) 270 return libbpf_err(-E2BIG); 271 272 attr.insns = ptr_to_u64(insns); 273 attr.insn_cnt = (__u32)insn_cnt; 274 275 attach_prog_fd = OPTS_GET(opts, attach_prog_fd, 0); 276 attach_btf_obj_fd = OPTS_GET(opts, attach_btf_obj_fd, 0); 277 278 if (attach_prog_fd && attach_btf_obj_fd) 279 return libbpf_err(-EINVAL); 280 281 attr.attach_btf_id = OPTS_GET(opts, attach_btf_id, 0); 282 if (attach_prog_fd) 283 attr.attach_prog_fd = attach_prog_fd; 284 else 285 attr.attach_btf_obj_fd = attach_btf_obj_fd; 286 287 log_buf = OPTS_GET(opts, log_buf, NULL); 288 log_size = OPTS_GET(opts, log_size, 0); 289 log_level = OPTS_GET(opts, log_level, 0); 290 291 if (!!log_buf != !!log_size) 292 return libbpf_err(-EINVAL); 293 294 func_info_rec_size = OPTS_GET(opts, func_info_rec_size, 0); 295 func_info = OPTS_GET(opts, func_info, NULL); 296 attr.func_info_rec_size = func_info_rec_size; 297 attr.func_info = ptr_to_u64(func_info); 298 attr.func_info_cnt = OPTS_GET(opts, func_info_cnt, 0); 299 300 line_info_rec_size = OPTS_GET(opts, line_info_rec_size, 0); 301 line_info = OPTS_GET(opts, line_info, NULL); 302 attr.line_info_rec_size = line_info_rec_size; 303 attr.line_info = ptr_to_u64(line_info); 304 attr.line_info_cnt = OPTS_GET(opts, line_info_cnt, 0); 305 306 attr.fd_array = ptr_to_u64(OPTS_GET(opts, fd_array, NULL)); 307 308 if (log_level) { 309 attr.log_buf = ptr_to_u64(log_buf); 310 attr.log_size = log_size; 311 attr.log_level = log_level; 312 } 313 314 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 315 OPTS_SET(opts, log_true_size, attr.log_true_size); 316 if (fd >= 0) 317 return fd; 318 319 /* After bpf_prog_load, the kernel may modify certain attributes 320 * to give user space a hint how to deal with loading failure. 321 * Check to see whether we can make some changes and load again. 322 */ 323 while (errno == E2BIG && (!finfo || !linfo)) { 324 if (!finfo && attr.func_info_cnt && 325 attr.func_info_rec_size < func_info_rec_size) { 326 /* try with corrected func info records */ 327 finfo = alloc_zero_tailing_info(func_info, 328 attr.func_info_cnt, 329 func_info_rec_size, 330 attr.func_info_rec_size); 331 if (!finfo) { 332 errno = E2BIG; 333 goto done; 334 } 335 336 attr.func_info = ptr_to_u64(finfo); 337 attr.func_info_rec_size = func_info_rec_size; 338 } else if (!linfo && attr.line_info_cnt && 339 attr.line_info_rec_size < line_info_rec_size) { 340 linfo = alloc_zero_tailing_info(line_info, 341 attr.line_info_cnt, 342 line_info_rec_size, 343 attr.line_info_rec_size); 344 if (!linfo) { 345 errno = E2BIG; 346 goto done; 347 } 348 349 attr.line_info = ptr_to_u64(linfo); 350 attr.line_info_rec_size = line_info_rec_size; 351 } else { 352 break; 353 } 354 355 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 356 OPTS_SET(opts, log_true_size, attr.log_true_size); 357 if (fd >= 0) 358 goto done; 359 } 360 361 if (log_level == 0 && log_buf) { 362 /* log_level == 0 with non-NULL log_buf requires retrying on error 363 * with log_level == 1 and log_buf/log_buf_size set, to get details of 364 * failure 365 */ 366 attr.log_buf = ptr_to_u64(log_buf); 367 attr.log_size = log_size; 368 attr.log_level = 1; 369 370 fd = sys_bpf_prog_load(&attr, attr_sz, attempts); 371 OPTS_SET(opts, log_true_size, attr.log_true_size); 372 } 373 done: 374 /* free() doesn't affect errno, so we don't need to restore it */ 375 free(finfo); 376 free(linfo); 377 return libbpf_err_errno(fd); 378 } 379 380 int bpf_map_update_elem(int fd, const void *key, const void *value, 381 __u64 flags) 382 { 383 const size_t attr_sz = offsetofend(union bpf_attr, flags); 384 union bpf_attr attr; 385 int ret; 386 387 memset(&attr, 0, attr_sz); 388 attr.map_fd = fd; 389 attr.key = ptr_to_u64(key); 390 attr.value = ptr_to_u64(value); 391 attr.flags = flags; 392 393 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, attr_sz); 394 return libbpf_err_errno(ret); 395 } 396 397 int bpf_map_lookup_elem(int fd, const void *key, void *value) 398 { 399 const size_t attr_sz = offsetofend(union bpf_attr, flags); 400 union bpf_attr attr; 401 int ret; 402 403 memset(&attr, 0, attr_sz); 404 attr.map_fd = fd; 405 attr.key = ptr_to_u64(key); 406 attr.value = ptr_to_u64(value); 407 408 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz); 409 return libbpf_err_errno(ret); 410 } 411 412 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 413 { 414 const size_t attr_sz = offsetofend(union bpf_attr, flags); 415 union bpf_attr attr; 416 int ret; 417 418 memset(&attr, 0, attr_sz); 419 attr.map_fd = fd; 420 attr.key = ptr_to_u64(key); 421 attr.value = ptr_to_u64(value); 422 attr.flags = flags; 423 424 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz); 425 return libbpf_err_errno(ret); 426 } 427 428 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 429 { 430 const size_t attr_sz = offsetofend(union bpf_attr, flags); 431 union bpf_attr attr; 432 int ret; 433 434 memset(&attr, 0, attr_sz); 435 attr.map_fd = fd; 436 attr.key = ptr_to_u64(key); 437 attr.value = ptr_to_u64(value); 438 439 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz); 440 return libbpf_err_errno(ret); 441 } 442 443 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags) 444 { 445 const size_t attr_sz = offsetofend(union bpf_attr, flags); 446 union bpf_attr attr; 447 int ret; 448 449 memset(&attr, 0, attr_sz); 450 attr.map_fd = fd; 451 attr.key = ptr_to_u64(key); 452 attr.value = ptr_to_u64(value); 453 attr.flags = flags; 454 455 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz); 456 return libbpf_err_errno(ret); 457 } 458 459 int bpf_map_delete_elem(int fd, const void *key) 460 { 461 const size_t attr_sz = offsetofend(union bpf_attr, flags); 462 union bpf_attr attr; 463 int ret; 464 465 memset(&attr, 0, attr_sz); 466 attr.map_fd = fd; 467 attr.key = ptr_to_u64(key); 468 469 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz); 470 return libbpf_err_errno(ret); 471 } 472 473 int bpf_map_delete_elem_flags(int fd, const void *key, __u64 flags) 474 { 475 const size_t attr_sz = offsetofend(union bpf_attr, flags); 476 union bpf_attr attr; 477 int ret; 478 479 memset(&attr, 0, attr_sz); 480 attr.map_fd = fd; 481 attr.key = ptr_to_u64(key); 482 attr.flags = flags; 483 484 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz); 485 return libbpf_err_errno(ret); 486 } 487 488 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 489 { 490 const size_t attr_sz = offsetofend(union bpf_attr, next_key); 491 union bpf_attr attr; 492 int ret; 493 494 memset(&attr, 0, attr_sz); 495 attr.map_fd = fd; 496 attr.key = ptr_to_u64(key); 497 attr.next_key = ptr_to_u64(next_key); 498 499 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, attr_sz); 500 return libbpf_err_errno(ret); 501 } 502 503 int bpf_map_freeze(int fd) 504 { 505 const size_t attr_sz = offsetofend(union bpf_attr, map_fd); 506 union bpf_attr attr; 507 int ret; 508 509 memset(&attr, 0, attr_sz); 510 attr.map_fd = fd; 511 512 ret = sys_bpf(BPF_MAP_FREEZE, &attr, attr_sz); 513 return libbpf_err_errno(ret); 514 } 515 516 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 517 void *out_batch, void *keys, void *values, 518 __u32 *count, 519 const struct bpf_map_batch_opts *opts) 520 { 521 const size_t attr_sz = offsetofend(union bpf_attr, batch); 522 union bpf_attr attr; 523 int ret; 524 525 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 526 return libbpf_err(-EINVAL); 527 528 memset(&attr, 0, attr_sz); 529 attr.batch.map_fd = fd; 530 attr.batch.in_batch = ptr_to_u64(in_batch); 531 attr.batch.out_batch = ptr_to_u64(out_batch); 532 attr.batch.keys = ptr_to_u64(keys); 533 attr.batch.values = ptr_to_u64(values); 534 attr.batch.count = *count; 535 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 536 attr.batch.flags = OPTS_GET(opts, flags, 0); 537 538 ret = sys_bpf(cmd, &attr, attr_sz); 539 *count = attr.batch.count; 540 541 return libbpf_err_errno(ret); 542 } 543 544 int bpf_map_delete_batch(int fd, const void *keys, __u32 *count, 545 const struct bpf_map_batch_opts *opts) 546 { 547 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 548 NULL, (void *)keys, NULL, count, opts); 549 } 550 551 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 552 void *values, __u32 *count, 553 const struct bpf_map_batch_opts *opts) 554 { 555 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 556 out_batch, keys, values, count, opts); 557 } 558 559 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 560 void *keys, void *values, __u32 *count, 561 const struct bpf_map_batch_opts *opts) 562 { 563 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 564 fd, in_batch, out_batch, keys, values, 565 count, opts); 566 } 567 568 int bpf_map_update_batch(int fd, const void *keys, const void *values, __u32 *count, 569 const struct bpf_map_batch_opts *opts) 570 { 571 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 572 (void *)keys, (void *)values, count, opts); 573 } 574 575 int bpf_obj_pin_opts(int fd, const char *pathname, const struct bpf_obj_pin_opts *opts) 576 { 577 const size_t attr_sz = offsetofend(union bpf_attr, path_fd); 578 union bpf_attr attr; 579 int ret; 580 581 if (!OPTS_VALID(opts, bpf_obj_pin_opts)) 582 return libbpf_err(-EINVAL); 583 584 memset(&attr, 0, attr_sz); 585 attr.path_fd = OPTS_GET(opts, path_fd, 0); 586 attr.pathname = ptr_to_u64((void *)pathname); 587 attr.file_flags = OPTS_GET(opts, file_flags, 0); 588 attr.bpf_fd = fd; 589 590 ret = sys_bpf(BPF_OBJ_PIN, &attr, attr_sz); 591 return libbpf_err_errno(ret); 592 } 593 594 int bpf_obj_pin(int fd, const char *pathname) 595 { 596 return bpf_obj_pin_opts(fd, pathname, NULL); 597 } 598 599 int bpf_obj_get(const char *pathname) 600 { 601 return bpf_obj_get_opts(pathname, NULL); 602 } 603 604 int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts) 605 { 606 const size_t attr_sz = offsetofend(union bpf_attr, path_fd); 607 union bpf_attr attr; 608 int fd; 609 610 if (!OPTS_VALID(opts, bpf_obj_get_opts)) 611 return libbpf_err(-EINVAL); 612 613 memset(&attr, 0, attr_sz); 614 attr.path_fd = OPTS_GET(opts, path_fd, 0); 615 attr.pathname = ptr_to_u64((void *)pathname); 616 attr.file_flags = OPTS_GET(opts, file_flags, 0); 617 618 fd = sys_bpf_fd(BPF_OBJ_GET, &attr, attr_sz); 619 return libbpf_err_errno(fd); 620 } 621 622 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 623 unsigned int flags) 624 { 625 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 626 .flags = flags, 627 ); 628 629 return bpf_prog_attach_opts(prog_fd, target_fd, type, &opts); 630 } 631 632 int bpf_prog_attach_opts(int prog_fd, int target, enum bpf_attach_type type, 633 const struct bpf_prog_attach_opts *opts) 634 { 635 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision); 636 __u32 relative_id, flags; 637 int ret, relative_fd; 638 union bpf_attr attr; 639 640 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 641 return libbpf_err(-EINVAL); 642 643 relative_id = OPTS_GET(opts, relative_id, 0); 644 relative_fd = OPTS_GET(opts, relative_fd, 0); 645 flags = OPTS_GET(opts, flags, 0); 646 647 /* validate we don't have unexpected combinations of non-zero fields */ 648 if (relative_fd && relative_id) 649 return libbpf_err(-EINVAL); 650 651 memset(&attr, 0, attr_sz); 652 attr.target_fd = target; 653 attr.attach_bpf_fd = prog_fd; 654 attr.attach_type = type; 655 attr.replace_bpf_fd = OPTS_GET(opts, replace_fd, 0); 656 attr.expected_revision = OPTS_GET(opts, expected_revision, 0); 657 658 if (relative_id) { 659 attr.attach_flags = flags | BPF_F_ID; 660 attr.relative_id = relative_id; 661 } else { 662 attr.attach_flags = flags; 663 attr.relative_fd = relative_fd; 664 } 665 666 ret = sys_bpf(BPF_PROG_ATTACH, &attr, attr_sz); 667 return libbpf_err_errno(ret); 668 } 669 670 int bpf_prog_detach_opts(int prog_fd, int target, enum bpf_attach_type type, 671 const struct bpf_prog_detach_opts *opts) 672 { 673 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision); 674 __u32 relative_id, flags; 675 int ret, relative_fd; 676 union bpf_attr attr; 677 678 if (!OPTS_VALID(opts, bpf_prog_detach_opts)) 679 return libbpf_err(-EINVAL); 680 681 relative_id = OPTS_GET(opts, relative_id, 0); 682 relative_fd = OPTS_GET(opts, relative_fd, 0); 683 flags = OPTS_GET(opts, flags, 0); 684 685 /* validate we don't have unexpected combinations of non-zero fields */ 686 if (relative_fd && relative_id) 687 return libbpf_err(-EINVAL); 688 689 memset(&attr, 0, attr_sz); 690 attr.target_fd = target; 691 attr.attach_bpf_fd = prog_fd; 692 attr.attach_type = type; 693 attr.expected_revision = OPTS_GET(opts, expected_revision, 0); 694 695 if (relative_id) { 696 attr.attach_flags = flags | BPF_F_ID; 697 attr.relative_id = relative_id; 698 } else { 699 attr.attach_flags = flags; 700 attr.relative_fd = relative_fd; 701 } 702 703 ret = sys_bpf(BPF_PROG_DETACH, &attr, attr_sz); 704 return libbpf_err_errno(ret); 705 } 706 707 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 708 { 709 return bpf_prog_detach_opts(0, target_fd, type, NULL); 710 } 711 712 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 713 { 714 return bpf_prog_detach_opts(prog_fd, target_fd, type, NULL); 715 } 716 717 int bpf_link_create(int prog_fd, int target_fd, 718 enum bpf_attach_type attach_type, 719 const struct bpf_link_create_opts *opts) 720 { 721 const size_t attr_sz = offsetofend(union bpf_attr, link_create); 722 __u32 target_btf_id, iter_info_len, relative_id; 723 int fd, err, relative_fd; 724 union bpf_attr attr; 725 726 if (!OPTS_VALID(opts, bpf_link_create_opts)) 727 return libbpf_err(-EINVAL); 728 729 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 730 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 731 732 /* validate we don't have unexpected combinations of non-zero fields */ 733 if (iter_info_len || target_btf_id) { 734 if (iter_info_len && target_btf_id) 735 return libbpf_err(-EINVAL); 736 if (!OPTS_ZEROED(opts, target_btf_id)) 737 return libbpf_err(-EINVAL); 738 } 739 740 memset(&attr, 0, attr_sz); 741 attr.link_create.prog_fd = prog_fd; 742 attr.link_create.target_fd = target_fd; 743 attr.link_create.attach_type = attach_type; 744 attr.link_create.flags = OPTS_GET(opts, flags, 0); 745 746 if (target_btf_id) { 747 attr.link_create.target_btf_id = target_btf_id; 748 goto proceed; 749 } 750 751 switch (attach_type) { 752 case BPF_TRACE_ITER: 753 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 754 attr.link_create.iter_info_len = iter_info_len; 755 break; 756 case BPF_PERF_EVENT: 757 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0); 758 if (!OPTS_ZEROED(opts, perf_event)) 759 return libbpf_err(-EINVAL); 760 break; 761 case BPF_TRACE_KPROBE_MULTI: 762 attr.link_create.kprobe_multi.flags = OPTS_GET(opts, kprobe_multi.flags, 0); 763 attr.link_create.kprobe_multi.cnt = OPTS_GET(opts, kprobe_multi.cnt, 0); 764 attr.link_create.kprobe_multi.syms = ptr_to_u64(OPTS_GET(opts, kprobe_multi.syms, 0)); 765 attr.link_create.kprobe_multi.addrs = ptr_to_u64(OPTS_GET(opts, kprobe_multi.addrs, 0)); 766 attr.link_create.kprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, kprobe_multi.cookies, 0)); 767 if (!OPTS_ZEROED(opts, kprobe_multi)) 768 return libbpf_err(-EINVAL); 769 break; 770 case BPF_TRACE_UPROBE_MULTI: 771 attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0); 772 attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0); 773 attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0)); 774 attr.link_create.uprobe_multi.offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.offsets, 0)); 775 attr.link_create.uprobe_multi.ref_ctr_offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.ref_ctr_offsets, 0)); 776 attr.link_create.uprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, uprobe_multi.cookies, 0)); 777 attr.link_create.uprobe_multi.pid = OPTS_GET(opts, uprobe_multi.pid, 0); 778 if (!OPTS_ZEROED(opts, uprobe_multi)) 779 return libbpf_err(-EINVAL); 780 break; 781 case BPF_TRACE_FENTRY: 782 case BPF_TRACE_FEXIT: 783 case BPF_MODIFY_RETURN: 784 case BPF_LSM_MAC: 785 attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0); 786 if (!OPTS_ZEROED(opts, tracing)) 787 return libbpf_err(-EINVAL); 788 break; 789 case BPF_NETFILTER: 790 attr.link_create.netfilter.pf = OPTS_GET(opts, netfilter.pf, 0); 791 attr.link_create.netfilter.hooknum = OPTS_GET(opts, netfilter.hooknum, 0); 792 attr.link_create.netfilter.priority = OPTS_GET(opts, netfilter.priority, 0); 793 attr.link_create.netfilter.flags = OPTS_GET(opts, netfilter.flags, 0); 794 if (!OPTS_ZEROED(opts, netfilter)) 795 return libbpf_err(-EINVAL); 796 break; 797 case BPF_TCX_INGRESS: 798 case BPF_TCX_EGRESS: 799 relative_fd = OPTS_GET(opts, tcx.relative_fd, 0); 800 relative_id = OPTS_GET(opts, tcx.relative_id, 0); 801 if (relative_fd && relative_id) 802 return libbpf_err(-EINVAL); 803 if (relative_id) { 804 attr.link_create.tcx.relative_id = relative_id; 805 attr.link_create.flags |= BPF_F_ID; 806 } else { 807 attr.link_create.tcx.relative_fd = relative_fd; 808 } 809 attr.link_create.tcx.expected_revision = OPTS_GET(opts, tcx.expected_revision, 0); 810 if (!OPTS_ZEROED(opts, tcx)) 811 return libbpf_err(-EINVAL); 812 break; 813 case BPF_NETKIT_PRIMARY: 814 case BPF_NETKIT_PEER: 815 relative_fd = OPTS_GET(opts, netkit.relative_fd, 0); 816 relative_id = OPTS_GET(opts, netkit.relative_id, 0); 817 if (relative_fd && relative_id) 818 return libbpf_err(-EINVAL); 819 if (relative_id) { 820 attr.link_create.netkit.relative_id = relative_id; 821 attr.link_create.flags |= BPF_F_ID; 822 } else { 823 attr.link_create.netkit.relative_fd = relative_fd; 824 } 825 attr.link_create.netkit.expected_revision = OPTS_GET(opts, netkit.expected_revision, 0); 826 if (!OPTS_ZEROED(opts, netkit)) 827 return libbpf_err(-EINVAL); 828 break; 829 default: 830 if (!OPTS_ZEROED(opts, flags)) 831 return libbpf_err(-EINVAL); 832 break; 833 } 834 proceed: 835 fd = sys_bpf_fd(BPF_LINK_CREATE, &attr, attr_sz); 836 if (fd >= 0) 837 return fd; 838 /* we'll get EINVAL if LINK_CREATE doesn't support attaching fentry 839 * and other similar programs 840 */ 841 err = -errno; 842 if (err != -EINVAL) 843 return libbpf_err(err); 844 845 /* if user used features not supported by 846 * BPF_RAW_TRACEPOINT_OPEN command, then just give up immediately 847 */ 848 if (attr.link_create.target_fd || attr.link_create.target_btf_id) 849 return libbpf_err(err); 850 if (!OPTS_ZEROED(opts, sz)) 851 return libbpf_err(err); 852 853 /* otherwise, for few select kinds of programs that can be 854 * attached using BPF_RAW_TRACEPOINT_OPEN command, try that as 855 * a fallback for older kernels 856 */ 857 switch (attach_type) { 858 case BPF_TRACE_RAW_TP: 859 case BPF_LSM_MAC: 860 case BPF_TRACE_FENTRY: 861 case BPF_TRACE_FEXIT: 862 case BPF_MODIFY_RETURN: 863 return bpf_raw_tracepoint_open(NULL, prog_fd); 864 default: 865 return libbpf_err(err); 866 } 867 } 868 869 int bpf_link_detach(int link_fd) 870 { 871 const size_t attr_sz = offsetofend(union bpf_attr, link_detach); 872 union bpf_attr attr; 873 int ret; 874 875 memset(&attr, 0, attr_sz); 876 attr.link_detach.link_fd = link_fd; 877 878 ret = sys_bpf(BPF_LINK_DETACH, &attr, attr_sz); 879 return libbpf_err_errno(ret); 880 } 881 882 int bpf_link_update(int link_fd, int new_prog_fd, 883 const struct bpf_link_update_opts *opts) 884 { 885 const size_t attr_sz = offsetofend(union bpf_attr, link_update); 886 union bpf_attr attr; 887 int ret; 888 889 if (!OPTS_VALID(opts, bpf_link_update_opts)) 890 return libbpf_err(-EINVAL); 891 892 if (OPTS_GET(opts, old_prog_fd, 0) && OPTS_GET(opts, old_map_fd, 0)) 893 return libbpf_err(-EINVAL); 894 895 memset(&attr, 0, attr_sz); 896 attr.link_update.link_fd = link_fd; 897 attr.link_update.new_prog_fd = new_prog_fd; 898 attr.link_update.flags = OPTS_GET(opts, flags, 0); 899 if (OPTS_GET(opts, old_prog_fd, 0)) 900 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 901 else if (OPTS_GET(opts, old_map_fd, 0)) 902 attr.link_update.old_map_fd = OPTS_GET(opts, old_map_fd, 0); 903 904 ret = sys_bpf(BPF_LINK_UPDATE, &attr, attr_sz); 905 return libbpf_err_errno(ret); 906 } 907 908 int bpf_iter_create(int link_fd) 909 { 910 const size_t attr_sz = offsetofend(union bpf_attr, iter_create); 911 union bpf_attr attr; 912 int fd; 913 914 memset(&attr, 0, attr_sz); 915 attr.iter_create.link_fd = link_fd; 916 917 fd = sys_bpf_fd(BPF_ITER_CREATE, &attr, attr_sz); 918 return libbpf_err_errno(fd); 919 } 920 921 int bpf_prog_query_opts(int target, enum bpf_attach_type type, 922 struct bpf_prog_query_opts *opts) 923 { 924 const size_t attr_sz = offsetofend(union bpf_attr, query); 925 union bpf_attr attr; 926 int ret; 927 928 if (!OPTS_VALID(opts, bpf_prog_query_opts)) 929 return libbpf_err(-EINVAL); 930 931 memset(&attr, 0, attr_sz); 932 attr.query.target_fd = target; 933 attr.query.attach_type = type; 934 attr.query.query_flags = OPTS_GET(opts, query_flags, 0); 935 attr.query.count = OPTS_GET(opts, count, 0); 936 attr.query.prog_ids = ptr_to_u64(OPTS_GET(opts, prog_ids, NULL)); 937 attr.query.link_ids = ptr_to_u64(OPTS_GET(opts, link_ids, NULL)); 938 attr.query.prog_attach_flags = ptr_to_u64(OPTS_GET(opts, prog_attach_flags, NULL)); 939 attr.query.link_attach_flags = ptr_to_u64(OPTS_GET(opts, link_attach_flags, NULL)); 940 941 ret = sys_bpf(BPF_PROG_QUERY, &attr, attr_sz); 942 943 OPTS_SET(opts, attach_flags, attr.query.attach_flags); 944 OPTS_SET(opts, revision, attr.query.revision); 945 OPTS_SET(opts, count, attr.query.count); 946 947 return libbpf_err_errno(ret); 948 } 949 950 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 951 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 952 { 953 LIBBPF_OPTS(bpf_prog_query_opts, opts); 954 int ret; 955 956 opts.query_flags = query_flags; 957 opts.prog_ids = prog_ids; 958 opts.prog_cnt = *prog_cnt; 959 960 ret = bpf_prog_query_opts(target_fd, type, &opts); 961 962 if (attach_flags) 963 *attach_flags = opts.attach_flags; 964 *prog_cnt = opts.prog_cnt; 965 966 return libbpf_err_errno(ret); 967 } 968 969 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 970 { 971 const size_t attr_sz = offsetofend(union bpf_attr, test); 972 union bpf_attr attr; 973 int ret; 974 975 if (!OPTS_VALID(opts, bpf_test_run_opts)) 976 return libbpf_err(-EINVAL); 977 978 memset(&attr, 0, attr_sz); 979 attr.test.prog_fd = prog_fd; 980 attr.test.batch_size = OPTS_GET(opts, batch_size, 0); 981 attr.test.cpu = OPTS_GET(opts, cpu, 0); 982 attr.test.flags = OPTS_GET(opts, flags, 0); 983 attr.test.repeat = OPTS_GET(opts, repeat, 0); 984 attr.test.duration = OPTS_GET(opts, duration, 0); 985 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 986 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 987 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 988 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 989 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 990 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 991 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 992 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 993 994 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, attr_sz); 995 996 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 997 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 998 OPTS_SET(opts, duration, attr.test.duration); 999 OPTS_SET(opts, retval, attr.test.retval); 1000 1001 return libbpf_err_errno(ret); 1002 } 1003 1004 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 1005 { 1006 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1007 union bpf_attr attr; 1008 int err; 1009 1010 memset(&attr, 0, attr_sz); 1011 attr.start_id = start_id; 1012 1013 err = sys_bpf(cmd, &attr, attr_sz); 1014 if (!err) 1015 *next_id = attr.next_id; 1016 1017 return libbpf_err_errno(err); 1018 } 1019 1020 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 1021 { 1022 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 1023 } 1024 1025 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 1026 { 1027 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 1028 } 1029 1030 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 1031 { 1032 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 1033 } 1034 1035 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 1036 { 1037 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 1038 } 1039 1040 int bpf_prog_get_fd_by_id_opts(__u32 id, 1041 const struct bpf_get_fd_by_id_opts *opts) 1042 { 1043 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1044 union bpf_attr attr; 1045 int fd; 1046 1047 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1048 return libbpf_err(-EINVAL); 1049 1050 memset(&attr, 0, attr_sz); 1051 attr.prog_id = id; 1052 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1053 1054 fd = sys_bpf_fd(BPF_PROG_GET_FD_BY_ID, &attr, attr_sz); 1055 return libbpf_err_errno(fd); 1056 } 1057 1058 int bpf_prog_get_fd_by_id(__u32 id) 1059 { 1060 return bpf_prog_get_fd_by_id_opts(id, NULL); 1061 } 1062 1063 int bpf_map_get_fd_by_id_opts(__u32 id, 1064 const struct bpf_get_fd_by_id_opts *opts) 1065 { 1066 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1067 union bpf_attr attr; 1068 int fd; 1069 1070 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1071 return libbpf_err(-EINVAL); 1072 1073 memset(&attr, 0, attr_sz); 1074 attr.map_id = id; 1075 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1076 1077 fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, attr_sz); 1078 return libbpf_err_errno(fd); 1079 } 1080 1081 int bpf_map_get_fd_by_id(__u32 id) 1082 { 1083 return bpf_map_get_fd_by_id_opts(id, NULL); 1084 } 1085 1086 int bpf_btf_get_fd_by_id_opts(__u32 id, 1087 const struct bpf_get_fd_by_id_opts *opts) 1088 { 1089 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1090 union bpf_attr attr; 1091 int fd; 1092 1093 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1094 return libbpf_err(-EINVAL); 1095 1096 memset(&attr, 0, attr_sz); 1097 attr.btf_id = id; 1098 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1099 1100 fd = sys_bpf_fd(BPF_BTF_GET_FD_BY_ID, &attr, attr_sz); 1101 return libbpf_err_errno(fd); 1102 } 1103 1104 int bpf_btf_get_fd_by_id(__u32 id) 1105 { 1106 return bpf_btf_get_fd_by_id_opts(id, NULL); 1107 } 1108 1109 int bpf_link_get_fd_by_id_opts(__u32 id, 1110 const struct bpf_get_fd_by_id_opts *opts) 1111 { 1112 const size_t attr_sz = offsetofend(union bpf_attr, open_flags); 1113 union bpf_attr attr; 1114 int fd; 1115 1116 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts)) 1117 return libbpf_err(-EINVAL); 1118 1119 memset(&attr, 0, attr_sz); 1120 attr.link_id = id; 1121 attr.open_flags = OPTS_GET(opts, open_flags, 0); 1122 1123 fd = sys_bpf_fd(BPF_LINK_GET_FD_BY_ID, &attr, attr_sz); 1124 return libbpf_err_errno(fd); 1125 } 1126 1127 int bpf_link_get_fd_by_id(__u32 id) 1128 { 1129 return bpf_link_get_fd_by_id_opts(id, NULL); 1130 } 1131 1132 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 1133 { 1134 const size_t attr_sz = offsetofend(union bpf_attr, info); 1135 union bpf_attr attr; 1136 int err; 1137 1138 memset(&attr, 0, attr_sz); 1139 attr.info.bpf_fd = bpf_fd; 1140 attr.info.info_len = *info_len; 1141 attr.info.info = ptr_to_u64(info); 1142 1143 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, attr_sz); 1144 if (!err) 1145 *info_len = attr.info.info_len; 1146 return libbpf_err_errno(err); 1147 } 1148 1149 int bpf_prog_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, __u32 *info_len) 1150 { 1151 return bpf_obj_get_info_by_fd(prog_fd, info, info_len); 1152 } 1153 1154 int bpf_map_get_info_by_fd(int map_fd, struct bpf_map_info *info, __u32 *info_len) 1155 { 1156 return bpf_obj_get_info_by_fd(map_fd, info, info_len); 1157 } 1158 1159 int bpf_btf_get_info_by_fd(int btf_fd, struct bpf_btf_info *info, __u32 *info_len) 1160 { 1161 return bpf_obj_get_info_by_fd(btf_fd, info, info_len); 1162 } 1163 1164 int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len) 1165 { 1166 return bpf_obj_get_info_by_fd(link_fd, info, info_len); 1167 } 1168 1169 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 1170 { 1171 const size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint); 1172 union bpf_attr attr; 1173 int fd; 1174 1175 memset(&attr, 0, attr_sz); 1176 attr.raw_tracepoint.name = ptr_to_u64(name); 1177 attr.raw_tracepoint.prog_fd = prog_fd; 1178 1179 fd = sys_bpf_fd(BPF_RAW_TRACEPOINT_OPEN, &attr, attr_sz); 1180 return libbpf_err_errno(fd); 1181 } 1182 1183 int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts) 1184 { 1185 const size_t attr_sz = offsetofend(union bpf_attr, btf_log_true_size); 1186 union bpf_attr attr; 1187 char *log_buf; 1188 size_t log_size; 1189 __u32 log_level; 1190 int fd; 1191 1192 bump_rlimit_memlock(); 1193 1194 memset(&attr, 0, attr_sz); 1195 1196 if (!OPTS_VALID(opts, bpf_btf_load_opts)) 1197 return libbpf_err(-EINVAL); 1198 1199 log_buf = OPTS_GET(opts, log_buf, NULL); 1200 log_size = OPTS_GET(opts, log_size, 0); 1201 log_level = OPTS_GET(opts, log_level, 0); 1202 1203 if (log_size > UINT_MAX) 1204 return libbpf_err(-EINVAL); 1205 if (log_size && !log_buf) 1206 return libbpf_err(-EINVAL); 1207 1208 attr.btf = ptr_to_u64(btf_data); 1209 attr.btf_size = btf_size; 1210 /* log_level == 0 and log_buf != NULL means "try loading without 1211 * log_buf, but retry with log_buf and log_level=1 on error", which is 1212 * consistent across low-level and high-level BTF and program loading 1213 * APIs within libbpf and provides a sensible behavior in practice 1214 */ 1215 if (log_level) { 1216 attr.btf_log_buf = ptr_to_u64(log_buf); 1217 attr.btf_log_size = (__u32)log_size; 1218 attr.btf_log_level = log_level; 1219 } 1220 1221 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz); 1222 if (fd < 0 && log_buf && log_level == 0) { 1223 attr.btf_log_buf = ptr_to_u64(log_buf); 1224 attr.btf_log_size = (__u32)log_size; 1225 attr.btf_log_level = 1; 1226 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz); 1227 } 1228 1229 OPTS_SET(opts, log_true_size, attr.btf_log_true_size); 1230 return libbpf_err_errno(fd); 1231 } 1232 1233 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 1234 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 1235 __u64 *probe_addr) 1236 { 1237 const size_t attr_sz = offsetofend(union bpf_attr, task_fd_query); 1238 union bpf_attr attr; 1239 int err; 1240 1241 memset(&attr, 0, attr_sz); 1242 attr.task_fd_query.pid = pid; 1243 attr.task_fd_query.fd = fd; 1244 attr.task_fd_query.flags = flags; 1245 attr.task_fd_query.buf = ptr_to_u64(buf); 1246 attr.task_fd_query.buf_len = *buf_len; 1247 1248 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, attr_sz); 1249 1250 *buf_len = attr.task_fd_query.buf_len; 1251 *prog_id = attr.task_fd_query.prog_id; 1252 *fd_type = attr.task_fd_query.fd_type; 1253 *probe_offset = attr.task_fd_query.probe_offset; 1254 *probe_addr = attr.task_fd_query.probe_addr; 1255 1256 return libbpf_err_errno(err); 1257 } 1258 1259 int bpf_enable_stats(enum bpf_stats_type type) 1260 { 1261 const size_t attr_sz = offsetofend(union bpf_attr, enable_stats); 1262 union bpf_attr attr; 1263 int fd; 1264 1265 memset(&attr, 0, attr_sz); 1266 attr.enable_stats.type = type; 1267 1268 fd = sys_bpf_fd(BPF_ENABLE_STATS, &attr, attr_sz); 1269 return libbpf_err_errno(fd); 1270 } 1271 1272 int bpf_prog_bind_map(int prog_fd, int map_fd, 1273 const struct bpf_prog_bind_opts *opts) 1274 { 1275 const size_t attr_sz = offsetofend(union bpf_attr, prog_bind_map); 1276 union bpf_attr attr; 1277 int ret; 1278 1279 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 1280 return libbpf_err(-EINVAL); 1281 1282 memset(&attr, 0, attr_sz); 1283 attr.prog_bind_map.prog_fd = prog_fd; 1284 attr.prog_bind_map.map_fd = map_fd; 1285 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 1286 1287 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz); 1288 return libbpf_err_errno(ret); 1289 } 1290