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

source code of linux/tools/lib/bpf/bpf.c