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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/or11 * modify it under the terms of the GNU Lesser General Public12 * 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 of17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the18 * GNU Lesser General Public License for more details.19 *20 * You should have received a copy of the GNU Lesser General Public21 * 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 is41 * required to be defined explicitly.42 */43#ifndef __NR_bpf44# if defined(__i386__)45# define __NR_bpf 35746# elif defined(__x86_64__)47# define __NR_bpf 32148# elif defined(__aarch64__)49# define __NR_bpf 28050# elif defined(__sparc__)51# define __NR_bpf 34952# elif defined(__s390__)53# define __NR_bpf 35154# elif defined(__arc__)55# define __NR_bpf 28056# elif defined(__mips__) && defined(_ABIO32)57# define __NR_bpf 435558# elif defined(__mips__) && defined(_ABIN32)59# define __NR_bpf 631960# elif defined(__mips__) && defined(_ABI64)61# define __NR_bpf 531562# else63# error __NR_bpf not defined. libbpf does not support your arch.64# endif65#endif66 67static inline __u64 ptr_to_u64(const void *ptr)68{69 return (__u64) (unsigned long) ptr;70}71 72static 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 78static 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 87int 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) to99 * 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 in101 * 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 */106int probe_memcg_account(int token_fd)107{108 const size_t attr_sz = offsetofend(union bpf_attr, prog_token_fd);109 struct bpf_insn insns[] = {110 BPF_EMIT_CALL(BPF_FUNC_ktime_get_coarse_ns),111 BPF_EXIT_INSN(),112 };113 size_t insn_cnt = ARRAY_SIZE(insns);114 union bpf_attr attr;115 int prog_fd;116 117 /* attempt loading freplace trying to use custom BTF */118 memset(&attr, 0, attr_sz);119 attr.prog_type = BPF_PROG_TYPE_SOCKET_FILTER;120 attr.insns = ptr_to_u64(insns);121 attr.insn_cnt = insn_cnt;122 attr.license = ptr_to_u64("GPL");123 attr.prog_token_fd = token_fd;124 if (token_fd)125 attr.prog_flags |= BPF_F_TOKEN_FD;126 127 prog_fd = sys_bpf_fd(BPF_PROG_LOAD, &attr, attr_sz);128 if (prog_fd >= 0) {129 close(prog_fd);130 return 1;131 }132 return 0;133}134 135static bool memlock_bumped;136static rlim_t memlock_rlim = RLIM_INFINITY;137 138int 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 147int 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 168int 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 211static void *212alloc_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 236int 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 else292 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 attributes327 * 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 error370 * with log_level == 1 and log_buf/log_buf_size set, to get details of371 * failure372 */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 }380done: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 387int 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 404int 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 419int 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 435int 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 450int 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 466int 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 480int 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 495int 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 510int 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 523static 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 551int 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 558int 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 566int 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 575int 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 582int 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 601int bpf_obj_pin(int fd, const char *pathname)602{603 return bpf_obj_pin_opts(fd, pathname, NULL);604}605 606int bpf_obj_get(const char *pathname)607{608 return bpf_obj_get_opts(pathname, NULL);609}610 611int 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 629int 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 639int 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 677int 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 714int 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 719int 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 724int 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 case BPF_TRACE_KPROBE_SESSION:770 attr.link_create.kprobe_multi.flags = OPTS_GET(opts, kprobe_multi.flags, 0);771 attr.link_create.kprobe_multi.cnt = OPTS_GET(opts, kprobe_multi.cnt, 0);772 attr.link_create.kprobe_multi.syms = ptr_to_u64(OPTS_GET(opts, kprobe_multi.syms, 0));773 attr.link_create.kprobe_multi.addrs = ptr_to_u64(OPTS_GET(opts, kprobe_multi.addrs, 0));774 attr.link_create.kprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, kprobe_multi.cookies, 0));775 if (!OPTS_ZEROED(opts, kprobe_multi))776 return libbpf_err(-EINVAL);777 break;778 case BPF_TRACE_UPROBE_MULTI:779 attr.link_create.uprobe_multi.flags = OPTS_GET(opts, uprobe_multi.flags, 0);780 attr.link_create.uprobe_multi.cnt = OPTS_GET(opts, uprobe_multi.cnt, 0);781 attr.link_create.uprobe_multi.path = ptr_to_u64(OPTS_GET(opts, uprobe_multi.path, 0));782 attr.link_create.uprobe_multi.offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.offsets, 0));783 attr.link_create.uprobe_multi.ref_ctr_offsets = ptr_to_u64(OPTS_GET(opts, uprobe_multi.ref_ctr_offsets, 0));784 attr.link_create.uprobe_multi.cookies = ptr_to_u64(OPTS_GET(opts, uprobe_multi.cookies, 0));785 attr.link_create.uprobe_multi.pid = OPTS_GET(opts, uprobe_multi.pid, 0);786 if (!OPTS_ZEROED(opts, uprobe_multi))787 return libbpf_err(-EINVAL);788 break;789 case BPF_TRACE_RAW_TP:790 case BPF_TRACE_FENTRY:791 case BPF_TRACE_FEXIT:792 case BPF_MODIFY_RETURN:793 case BPF_LSM_MAC:794 attr.link_create.tracing.cookie = OPTS_GET(opts, tracing.cookie, 0);795 if (!OPTS_ZEROED(opts, tracing))796 return libbpf_err(-EINVAL);797 break;798 case BPF_NETFILTER:799 attr.link_create.netfilter.pf = OPTS_GET(opts, netfilter.pf, 0);800 attr.link_create.netfilter.hooknum = OPTS_GET(opts, netfilter.hooknum, 0);801 attr.link_create.netfilter.priority = OPTS_GET(opts, netfilter.priority, 0);802 attr.link_create.netfilter.flags = OPTS_GET(opts, netfilter.flags, 0);803 if (!OPTS_ZEROED(opts, netfilter))804 return libbpf_err(-EINVAL);805 break;806 case BPF_TCX_INGRESS:807 case BPF_TCX_EGRESS:808 relative_fd = OPTS_GET(opts, tcx.relative_fd, 0);809 relative_id = OPTS_GET(opts, tcx.relative_id, 0);810 if (relative_fd && relative_id)811 return libbpf_err(-EINVAL);812 if (relative_id) {813 attr.link_create.tcx.relative_id = relative_id;814 attr.link_create.flags |= BPF_F_ID;815 } else {816 attr.link_create.tcx.relative_fd = relative_fd;817 }818 attr.link_create.tcx.expected_revision = OPTS_GET(opts, tcx.expected_revision, 0);819 if (!OPTS_ZEROED(opts, tcx))820 return libbpf_err(-EINVAL);821 break;822 case BPF_NETKIT_PRIMARY:823 case BPF_NETKIT_PEER:824 relative_fd = OPTS_GET(opts, netkit.relative_fd, 0);825 relative_id = OPTS_GET(opts, netkit.relative_id, 0);826 if (relative_fd && relative_id)827 return libbpf_err(-EINVAL);828 if (relative_id) {829 attr.link_create.netkit.relative_id = relative_id;830 attr.link_create.flags |= BPF_F_ID;831 } else {832 attr.link_create.netkit.relative_fd = relative_fd;833 }834 attr.link_create.netkit.expected_revision = OPTS_GET(opts, netkit.expected_revision, 0);835 if (!OPTS_ZEROED(opts, netkit))836 return libbpf_err(-EINVAL);837 break;838 default:839 if (!OPTS_ZEROED(opts, flags))840 return libbpf_err(-EINVAL);841 break;842 }843proceed:844 fd = sys_bpf_fd(BPF_LINK_CREATE, &attr, attr_sz);845 if (fd >= 0)846 return fd;847 /* we'll get EINVAL if LINK_CREATE doesn't support attaching fentry848 * and other similar programs849 */850 err = -errno;851 if (err != -EINVAL)852 return libbpf_err(err);853 854 /* if user used features not supported by855 * BPF_RAW_TRACEPOINT_OPEN command, then just give up immediately856 */857 if (attr.link_create.target_fd || attr.link_create.target_btf_id)858 return libbpf_err(err);859 if (!OPTS_ZEROED(opts, sz))860 return libbpf_err(err);861 862 /* otherwise, for few select kinds of programs that can be863 * attached using BPF_RAW_TRACEPOINT_OPEN command, try that as864 * a fallback for older kernels865 */866 switch (attach_type) {867 case BPF_TRACE_RAW_TP:868 case BPF_LSM_MAC:869 case BPF_TRACE_FENTRY:870 case BPF_TRACE_FEXIT:871 case BPF_MODIFY_RETURN:872 return bpf_raw_tracepoint_open(NULL, prog_fd);873 default:874 return libbpf_err(err);875 }876}877 878int bpf_link_detach(int link_fd)879{880 const size_t attr_sz = offsetofend(union bpf_attr, link_detach);881 union bpf_attr attr;882 int ret;883 884 memset(&attr, 0, attr_sz);885 attr.link_detach.link_fd = link_fd;886 887 ret = sys_bpf(BPF_LINK_DETACH, &attr, attr_sz);888 return libbpf_err_errno(ret);889}890 891int bpf_link_update(int link_fd, int new_prog_fd,892 const struct bpf_link_update_opts *opts)893{894 const size_t attr_sz = offsetofend(union bpf_attr, link_update);895 union bpf_attr attr;896 int ret;897 898 if (!OPTS_VALID(opts, bpf_link_update_opts))899 return libbpf_err(-EINVAL);900 901 if (OPTS_GET(opts, old_prog_fd, 0) && OPTS_GET(opts, old_map_fd, 0))902 return libbpf_err(-EINVAL);903 904 memset(&attr, 0, attr_sz);905 attr.link_update.link_fd = link_fd;906 attr.link_update.new_prog_fd = new_prog_fd;907 attr.link_update.flags = OPTS_GET(opts, flags, 0);908 if (OPTS_GET(opts, old_prog_fd, 0))909 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);910 else if (OPTS_GET(opts, old_map_fd, 0))911 attr.link_update.old_map_fd = OPTS_GET(opts, old_map_fd, 0);912 913 ret = sys_bpf(BPF_LINK_UPDATE, &attr, attr_sz);914 return libbpf_err_errno(ret);915}916 917int bpf_iter_create(int link_fd)918{919 const size_t attr_sz = offsetofend(union bpf_attr, iter_create);920 union bpf_attr attr;921 int fd;922 923 memset(&attr, 0, attr_sz);924 attr.iter_create.link_fd = link_fd;925 926 fd = sys_bpf_fd(BPF_ITER_CREATE, &attr, attr_sz);927 return libbpf_err_errno(fd);928}929 930int bpf_prog_query_opts(int target, enum bpf_attach_type type,931 struct bpf_prog_query_opts *opts)932{933 const size_t attr_sz = offsetofend(union bpf_attr, query);934 union bpf_attr attr;935 int ret;936 937 if (!OPTS_VALID(opts, bpf_prog_query_opts))938 return libbpf_err(-EINVAL);939 940 memset(&attr, 0, attr_sz);941 attr.query.target_fd = target;942 attr.query.attach_type = type;943 attr.query.query_flags = OPTS_GET(opts, query_flags, 0);944 attr.query.count = OPTS_GET(opts, count, 0);945 attr.query.prog_ids = ptr_to_u64(OPTS_GET(opts, prog_ids, NULL));946 attr.query.link_ids = ptr_to_u64(OPTS_GET(opts, link_ids, NULL));947 attr.query.prog_attach_flags = ptr_to_u64(OPTS_GET(opts, prog_attach_flags, NULL));948 attr.query.link_attach_flags = ptr_to_u64(OPTS_GET(opts, link_attach_flags, NULL));949 950 ret = sys_bpf(BPF_PROG_QUERY, &attr, attr_sz);951 952 OPTS_SET(opts, attach_flags, attr.query.attach_flags);953 OPTS_SET(opts, revision, attr.query.revision);954 OPTS_SET(opts, count, attr.query.count);955 956 return libbpf_err_errno(ret);957}958 959int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,960 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)961{962 LIBBPF_OPTS(bpf_prog_query_opts, opts);963 int ret;964 965 opts.query_flags = query_flags;966 opts.prog_ids = prog_ids;967 opts.prog_cnt = *prog_cnt;968 969 ret = bpf_prog_query_opts(target_fd, type, &opts);970 971 if (attach_flags)972 *attach_flags = opts.attach_flags;973 *prog_cnt = opts.prog_cnt;974 975 return libbpf_err_errno(ret);976}977 978int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)979{980 const size_t attr_sz = offsetofend(union bpf_attr, test);981 union bpf_attr attr;982 int ret;983 984 if (!OPTS_VALID(opts, bpf_test_run_opts))985 return libbpf_err(-EINVAL);986 987 memset(&attr, 0, attr_sz);988 attr.test.prog_fd = prog_fd;989 attr.test.batch_size = OPTS_GET(opts, batch_size, 0);990 attr.test.cpu = OPTS_GET(opts, cpu, 0);991 attr.test.flags = OPTS_GET(opts, flags, 0);992 attr.test.repeat = OPTS_GET(opts, repeat, 0);993 attr.test.duration = OPTS_GET(opts, duration, 0);994 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0);995 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0);996 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0);997 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0);998 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL));999 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL));1000 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL));1001 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));1002 1003 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, attr_sz);1004 1005 OPTS_SET(opts, data_size_out, attr.test.data_size_out);1006 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);1007 OPTS_SET(opts, duration, attr.test.duration);1008 OPTS_SET(opts, retval, attr.test.retval);1009 1010 return libbpf_err_errno(ret);1011}1012 1013static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)1014{1015 const size_t attr_sz = offsetofend(union bpf_attr, open_flags);1016 union bpf_attr attr;1017 int err;1018 1019 memset(&attr, 0, attr_sz);1020 attr.start_id = start_id;1021 1022 err = sys_bpf(cmd, &attr, attr_sz);1023 if (!err)1024 *next_id = attr.next_id;1025 1026 return libbpf_err_errno(err);1027}1028 1029int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)1030{1031 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID);1032}1033 1034int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)1035{1036 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);1037}1038 1039int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)1040{1041 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);1042}1043 1044int bpf_link_get_next_id(__u32 start_id, __u32 *next_id)1045{1046 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID);1047}1048 1049int bpf_prog_get_fd_by_id_opts(__u32 id,1050 const struct bpf_get_fd_by_id_opts *opts)1051{1052 const size_t attr_sz = offsetofend(union bpf_attr, open_flags);1053 union bpf_attr attr;1054 int fd;1055 1056 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts))1057 return libbpf_err(-EINVAL);1058 1059 memset(&attr, 0, attr_sz);1060 attr.prog_id = id;1061 attr.open_flags = OPTS_GET(opts, open_flags, 0);1062 1063 fd = sys_bpf_fd(BPF_PROG_GET_FD_BY_ID, &attr, attr_sz);1064 return libbpf_err_errno(fd);1065}1066 1067int bpf_prog_get_fd_by_id(__u32 id)1068{1069 return bpf_prog_get_fd_by_id_opts(id, NULL);1070}1071 1072int bpf_map_get_fd_by_id_opts(__u32 id,1073 const struct bpf_get_fd_by_id_opts *opts)1074{1075 const size_t attr_sz = offsetofend(union bpf_attr, open_flags);1076 union bpf_attr attr;1077 int fd;1078 1079 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts))1080 return libbpf_err(-EINVAL);1081 1082 memset(&attr, 0, attr_sz);1083 attr.map_id = id;1084 attr.open_flags = OPTS_GET(opts, open_flags, 0);1085 1086 fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, attr_sz);1087 return libbpf_err_errno(fd);1088}1089 1090int bpf_map_get_fd_by_id(__u32 id)1091{1092 return bpf_map_get_fd_by_id_opts(id, NULL);1093}1094 1095int bpf_btf_get_fd_by_id_opts(__u32 id,1096 const struct bpf_get_fd_by_id_opts *opts)1097{1098 const size_t attr_sz = offsetofend(union bpf_attr, open_flags);1099 union bpf_attr attr;1100 int fd;1101 1102 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts))1103 return libbpf_err(-EINVAL);1104 1105 memset(&attr, 0, attr_sz);1106 attr.btf_id = id;1107 attr.open_flags = OPTS_GET(opts, open_flags, 0);1108 1109 fd = sys_bpf_fd(BPF_BTF_GET_FD_BY_ID, &attr, attr_sz);1110 return libbpf_err_errno(fd);1111}1112 1113int bpf_btf_get_fd_by_id(__u32 id)1114{1115 return bpf_btf_get_fd_by_id_opts(id, NULL);1116}1117 1118int bpf_link_get_fd_by_id_opts(__u32 id,1119 const struct bpf_get_fd_by_id_opts *opts)1120{1121 const size_t attr_sz = offsetofend(union bpf_attr, open_flags);1122 union bpf_attr attr;1123 int fd;1124 1125 if (!OPTS_VALID(opts, bpf_get_fd_by_id_opts))1126 return libbpf_err(-EINVAL);1127 1128 memset(&attr, 0, attr_sz);1129 attr.link_id = id;1130 attr.open_flags = OPTS_GET(opts, open_flags, 0);1131 1132 fd = sys_bpf_fd(BPF_LINK_GET_FD_BY_ID, &attr, attr_sz);1133 return libbpf_err_errno(fd);1134}1135 1136int bpf_link_get_fd_by_id(__u32 id)1137{1138 return bpf_link_get_fd_by_id_opts(id, NULL);1139}1140 1141int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)1142{1143 const size_t attr_sz = offsetofend(union bpf_attr, info);1144 union bpf_attr attr;1145 int err;1146 1147 memset(&attr, 0, attr_sz);1148 attr.info.bpf_fd = bpf_fd;1149 attr.info.info_len = *info_len;1150 attr.info.info = ptr_to_u64(info);1151 1152 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, attr_sz);1153 if (!err)1154 *info_len = attr.info.info_len;1155 return libbpf_err_errno(err);1156}1157 1158int bpf_prog_get_info_by_fd(int prog_fd, struct bpf_prog_info *info, __u32 *info_len)1159{1160 return bpf_obj_get_info_by_fd(prog_fd, info, info_len);1161}1162 1163int bpf_map_get_info_by_fd(int map_fd, struct bpf_map_info *info, __u32 *info_len)1164{1165 return bpf_obj_get_info_by_fd(map_fd, info, info_len);1166}1167 1168int bpf_btf_get_info_by_fd(int btf_fd, struct bpf_btf_info *info, __u32 *info_len)1169{1170 return bpf_obj_get_info_by_fd(btf_fd, info, info_len);1171}1172 1173int bpf_link_get_info_by_fd(int link_fd, struct bpf_link_info *info, __u32 *info_len)1174{1175 return bpf_obj_get_info_by_fd(link_fd, info, info_len);1176}1177 1178int bpf_raw_tracepoint_open_opts(int prog_fd, struct bpf_raw_tp_opts *opts)1179{1180 const size_t attr_sz = offsetofend(union bpf_attr, raw_tracepoint);1181 union bpf_attr attr;1182 int fd;1183 1184 if (!OPTS_VALID(opts, bpf_raw_tp_opts))1185 return libbpf_err(-EINVAL);1186 1187 memset(&attr, 0, attr_sz);1188 attr.raw_tracepoint.prog_fd = prog_fd;1189 attr.raw_tracepoint.name = ptr_to_u64(OPTS_GET(opts, tp_name, NULL));1190 attr.raw_tracepoint.cookie = OPTS_GET(opts, cookie, 0);1191 1192 fd = sys_bpf_fd(BPF_RAW_TRACEPOINT_OPEN, &attr, attr_sz);1193 return libbpf_err_errno(fd);1194}1195 1196int bpf_raw_tracepoint_open(const char *name, int prog_fd)1197{1198 LIBBPF_OPTS(bpf_raw_tp_opts, opts, .tp_name = name);1199 1200 return bpf_raw_tracepoint_open_opts(prog_fd, &opts);1201}1202 1203int bpf_btf_load(const void *btf_data, size_t btf_size, struct bpf_btf_load_opts *opts)1204{1205 const size_t attr_sz = offsetofend(union bpf_attr, btf_token_fd);1206 union bpf_attr attr;1207 char *log_buf;1208 size_t log_size;1209 __u32 log_level;1210 int fd;1211 1212 bump_rlimit_memlock();1213 1214 memset(&attr, 0, attr_sz);1215 1216 if (!OPTS_VALID(opts, bpf_btf_load_opts))1217 return libbpf_err(-EINVAL);1218 1219 log_buf = OPTS_GET(opts, log_buf, NULL);1220 log_size = OPTS_GET(opts, log_size, 0);1221 log_level = OPTS_GET(opts, log_level, 0);1222 1223 if (log_size > UINT_MAX)1224 return libbpf_err(-EINVAL);1225 if (log_size && !log_buf)1226 return libbpf_err(-EINVAL);1227 1228 attr.btf = ptr_to_u64(btf_data);1229 attr.btf_size = btf_size;1230 1231 attr.btf_flags = OPTS_GET(opts, btf_flags, 0);1232 attr.btf_token_fd = OPTS_GET(opts, token_fd, 0);1233 1234 /* log_level == 0 and log_buf != NULL means "try loading without1235 * log_buf, but retry with log_buf and log_level=1 on error", which is1236 * consistent across low-level and high-level BTF and program loading1237 * APIs within libbpf and provides a sensible behavior in practice1238 */1239 if (log_level) {1240 attr.btf_log_buf = ptr_to_u64(log_buf);1241 attr.btf_log_size = (__u32)log_size;1242 attr.btf_log_level = log_level;1243 }1244 1245 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz);1246 if (fd < 0 && log_buf && log_level == 0) {1247 attr.btf_log_buf = ptr_to_u64(log_buf);1248 attr.btf_log_size = (__u32)log_size;1249 attr.btf_log_level = 1;1250 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, attr_sz);1251 }1252 1253 OPTS_SET(opts, log_true_size, attr.btf_log_true_size);1254 return libbpf_err_errno(fd);1255}1256 1257int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,1258 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,1259 __u64 *probe_addr)1260{1261 const size_t attr_sz = offsetofend(union bpf_attr, task_fd_query);1262 union bpf_attr attr;1263 int err;1264 1265 memset(&attr, 0, attr_sz);1266 attr.task_fd_query.pid = pid;1267 attr.task_fd_query.fd = fd;1268 attr.task_fd_query.flags = flags;1269 attr.task_fd_query.buf = ptr_to_u64(buf);1270 attr.task_fd_query.buf_len = *buf_len;1271 1272 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, attr_sz);1273 1274 *buf_len = attr.task_fd_query.buf_len;1275 *prog_id = attr.task_fd_query.prog_id;1276 *fd_type = attr.task_fd_query.fd_type;1277 *probe_offset = attr.task_fd_query.probe_offset;1278 *probe_addr = attr.task_fd_query.probe_addr;1279 1280 return libbpf_err_errno(err);1281}1282 1283int bpf_enable_stats(enum bpf_stats_type type)1284{1285 const size_t attr_sz = offsetofend(union bpf_attr, enable_stats);1286 union bpf_attr attr;1287 int fd;1288 1289 memset(&attr, 0, attr_sz);1290 attr.enable_stats.type = type;1291 1292 fd = sys_bpf_fd(BPF_ENABLE_STATS, &attr, attr_sz);1293 return libbpf_err_errno(fd);1294}1295 1296int bpf_prog_bind_map(int prog_fd, int map_fd,1297 const struct bpf_prog_bind_opts *opts)1298{1299 const size_t attr_sz = offsetofend(union bpf_attr, prog_bind_map);1300 union bpf_attr attr;1301 int ret;1302 1303 if (!OPTS_VALID(opts, bpf_prog_bind_opts))1304 return libbpf_err(-EINVAL);1305 1306 memset(&attr, 0, attr_sz);1307 attr.prog_bind_map.prog_fd = prog_fd;1308 attr.prog_bind_map.map_fd = map_fd;1309 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);1310 1311 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, attr_sz);1312 return libbpf_err_errno(ret);1313}1314 1315int bpf_token_create(int bpffs_fd, struct bpf_token_create_opts *opts)1316{1317 const size_t attr_sz = offsetofend(union bpf_attr, token_create);1318 union bpf_attr attr;1319 int fd;1320 1321 if (!OPTS_VALID(opts, bpf_token_create_opts))1322 return libbpf_err(-EINVAL);1323 1324 memset(&attr, 0, attr_sz);1325 attr.token_create.bpffs_fd = bpffs_fd;1326 attr.token_create.flags = OPTS_GET(opts, flags, 0);1327 1328 fd = sys_bpf_fd(BPF_TOKEN_CREATE, &attr, attr_sz);1329 return libbpf_err_errno(fd);1330}1331