1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2
3 /*
4 * common eBPF ELF operations.
5 *
6 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
7 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
8 * Copyright (C) 2015 Huawei Inc.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation;
13 * version 2.1 of the License (not later!)
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with this program; if not, see <http://www.gnu.org/licenses>
22 */
23
24 #include <stdlib.h>
25 #include <string.h>
26 #include <memory.h>
27 #include <unistd.h>
28 #include <asm/unistd.h>
29 #include <errno.h>
30 #include <linux/bpf.h>
31 #include <linux/filter.h>
32 #include <linux/kernel.h>
33 #include <limits.h>
34 #include <sys/resource.h>
35 #include "bpf.h"
36 #include "libbpf.h"
37 #include "libbpf_internal.h"
38
39 /*
40 * When building perf, unistd.h is overridden. __NR_bpf is
41 * required to be defined explicitly.
42 */
43 #ifndef __NR_bpf
44 # if defined(__i386__)
45 # define __NR_bpf 357
46 # elif defined(__x86_64__)
47 # define __NR_bpf 321
48 # elif defined(__aarch64__)
49 # define __NR_bpf 280
50 # elif defined(__sparc__)
51 # define __NR_bpf 349
52 # elif defined(__s390__)
53 # define __NR_bpf 351
54 # elif defined(__arc__)
55 # define __NR_bpf 280
56 # elif defined(__mips__) && defined(_ABIO32)
57 # define __NR_bpf 4355
58 # elif defined(__mips__) && defined(_ABIN32)
59 # define __NR_bpf 6319
60 # elif defined(__mips__) && defined(_ABI64)
61 # define __NR_bpf 5315
62 # else
63 # error __NR_bpf not defined. libbpf does not support your arch.
64 # endif
65 #endif
66
67 static inline __u64 ptr_to_u64(const void *ptr)
68 {
69 return (__u64) (unsigned long) ptr;
70 }
71
72 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
73 unsigned int size)
74 {
75 return syscall(__NR_bpf, cmd, attr, size);
76 }
77
78 static inline int sys_bpf_fd(enum bpf_cmd cmd, union bpf_attr *attr,
79 unsigned int size)
80 {
81 int fd;
82
83 fd = sys_bpf(cmd, attr, size);
84 return ensure_good_fd(fd);
85 }
86
87 int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts)
88 {
89 int fd;
90
91 do {
92 fd = sys_bpf_fd(BPF_PROG_LOAD, attr, size);
93 } while (fd < 0 && errno == EAGAIN && --attempts > 0);
94
95 return fd;
96 }
97
98 /* Probe whether kernel switched from memlock-based (RLIMIT_MEMLOCK) to
99 * memcg-based memory accounting for BPF maps and progs. This was done in [0].
100 * We use the support for bpf_ktime_get_coarse_ns() helper, which was added in
101 * the same 5.11 Linux release ([1]), to detect memcg-based accounting for BPF.
102 *
103 * [0] https://lore.kernel.org/bpf/20201201215900.3569844-1-guro@fb.com/
104 * [1] d05512618056 ("bpf: Add bpf_ktime_get_coarse_ns helper")
105 */
106 int probe_memcg_account(int token_fd)
107 {
108 const size_t attr_sz = offsetofend(union bpf_attr, 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
135 static bool memlock_bumped;
136 static rlim_t memlock_rlim = RLIM_INFINITY;
137
138 int libbpf_set_memlock_rlim(size_t memlock_bytes)
139 {
140 if (memlock_bumped)
141 return libbpf_err(-EBUSY);
142
143 memlock_rlim = memlock_bytes;
144 return 0;
145 }
146
147 int bump_rlimit_memlock(void)
148 {
149 struct rlimit rlim;
150
151 /* if kernel supports memcg-based accounting, skip bumping RLIMIT_MEMLOCK */
152 if (memlock_bumped || feat_supported(NULL, FEAT_MEMCG_ACCOUNT))
153 return 0;
154
155 memlock_bumped = true;
156
157 /* zero memlock_rlim_max disables auto-bumping RLIMIT_MEMLOCK */
158 if (memlock_rlim == 0)
159 return 0;
160
161 rlim.rlim_cur = rlim.rlim_max = memlock_rlim;
162 if (setrlimit(RLIMIT_MEMLOCK, &rlim))
163 return -errno;
164
165 return 0;
166 }
167
168 int bpf_map_create(enum bpf_map_type map_type,
169 const char *map_name,
170 __u32 key_size,
171 __u32 value_size,
172 __u32 max_entries,
173 const struct bpf_map_create_opts *opts)
174 {
175 const size_t attr_sz = offsetofend(union bpf_attr, map_token_fd);
176 union bpf_attr attr;
177 int fd;
178
179 bump_rlimit_memlock();
180
181 memset(&attr, 0, attr_sz);
182
183 if (!OPTS_VALID(opts, bpf_map_create_opts))
184 return libbpf_err(-EINVAL);
185
186 attr.map_type = map_type;
187 if (map_name && feat_supported(NULL, FEAT_PROG_NAME))
188 libbpf_strlcpy(attr.map_name, map_name, sizeof(attr.map_name));
189 attr.key_size = key_size;
190 attr.value_size = value_size;
191 attr.max_entries = max_entries;
192
193 attr.btf_fd = OPTS_GET(opts, btf_fd, 0);
194 attr.btf_key_type_id = OPTS_GET(opts, btf_key_type_id, 0);
195 attr.btf_value_type_id = OPTS_GET(opts, btf_value_type_id, 0);
196 attr.btf_vmlinux_value_type_id = OPTS_GET(opts, btf_vmlinux_value_type_id, 0);
197 attr.value_type_btf_obj_fd = OPTS_GET(opts, value_type_btf_obj_fd, 0);
198
199 attr.inner_map_fd = OPTS_GET(opts, inner_map_fd, 0);
200 attr.map_flags = OPTS_GET(opts, map_flags, 0);
201 attr.map_extra = OPTS_GET(opts, map_extra, 0);
202 attr.numa_node = OPTS_GET(opts, numa_node, 0);
203 attr.map_ifindex = OPTS_GET(opts, map_ifindex, 0);
204
205 attr.map_token_fd = OPTS_GET(opts, token_fd, 0);
206
207 fd = sys_bpf_fd(BPF_MAP_CREATE, &attr, attr_sz);
208 return libbpf_err_errno(fd);
209 }
210
211 static void *
212 alloc_zero_tailing_info(const void *orecord, __u32 cnt,
213 __u32 actual_rec_size, __u32 expected_rec_size)
214 {
215 __u64 info_len = (__u64)actual_rec_size * cnt;
216 void *info, *nrecord;
217 int i;
218
219 info = malloc(info_len);
220 if (!info)
221 return NULL;
222
223 /* zero out bytes kernel does not understand */
224 nrecord = info;
225 for (i = 0; i < cnt; i++) {
226 memcpy(nrecord, orecord, expected_rec_size);
227 memset(nrecord + expected_rec_size, 0,
228 actual_rec_size - expected_rec_size);
229 orecord += actual_rec_size;
230 nrecord += actual_rec_size;
231 }
232
233 return info;
234 }
235
236 int bpf_prog_load(enum bpf_prog_type prog_type,
237 const char *prog_name, const char *license,
238 const struct bpf_insn *insns, size_t insn_cnt,
239 struct bpf_prog_load_opts *opts)
240 {
241 const size_t attr_sz = offsetofend(union bpf_attr, prog_token_fd);
242 void *finfo = NULL, *linfo = NULL;
243 const char *func_info, *line_info;
244 __u32 log_size, log_level, attach_prog_fd, attach_btf_obj_fd;
245 __u32 func_info_rec_size, line_info_rec_size;
246 int fd, attempts;
247 union bpf_attr attr;
248 char *log_buf;
249
250 bump_rlimit_memlock();
251
252 if (!OPTS_VALID(opts, bpf_prog_load_opts))
253 return libbpf_err(-EINVAL);
254
255 attempts = OPTS_GET(opts, attempts, 0);
256 if (attempts < 0)
257 return libbpf_err(-EINVAL);
258 if (attempts == 0)
259 attempts = PROG_LOAD_ATTEMPTS;
260
261 memset(&attr, 0, attr_sz);
262
263 attr.prog_type = prog_type;
264 attr.expected_attach_type = OPTS_GET(opts, expected_attach_type, 0);
265
266 attr.prog_btf_fd = OPTS_GET(opts, prog_btf_fd, 0);
267 attr.prog_flags = OPTS_GET(opts, prog_flags, 0);
268 attr.prog_ifindex = OPTS_GET(opts, prog_ifindex, 0);
269 attr.kern_version = OPTS_GET(opts, kern_version, 0);
270 attr.prog_token_fd = OPTS_GET(opts, token_fd, 0);
271
272 if (prog_name && feat_supported(NULL, FEAT_PROG_NAME))
273 libbpf_strlcpy(attr.prog_name, prog_name, sizeof(attr.prog_name));
274 attr.license = ptr_to_u64(license);
275
276 if (insn_cnt > UINT_MAX)
277 return libbpf_err(-E2BIG);
278
279 attr.insns = ptr_to_u64(insns);
280 attr.insn_cnt = (__u32)insn_cnt;
281
282 attach_prog_fd = OPTS_GET(opts, attach_prog_fd, 0);
283 attach_btf_obj_fd = OPTS_GET(opts, attach_btf_obj_fd, 0);
284
285 if (attach_prog_fd && attach_btf_obj_fd)
286 return libbpf_err(-EINVAL);
287
288 attr.attach_btf_id = OPTS_GET(opts, attach_btf_id, 0);
289 if (attach_prog_fd)
290 attr.attach_prog_fd = attach_prog_fd;
291 else
292 attr.attach_btf_obj_fd = attach_btf_obj_fd;
293
294 log_buf = OPTS_GET(opts, log_buf, NULL);
295 log_size = OPTS_GET(opts, log_size, 0);
296 log_level = OPTS_GET(opts, log_level, 0);
297
298 if (!!log_buf != !!log_size)
299 return libbpf_err(-EINVAL);
300
301 func_info_rec_size = OPTS_GET(opts, func_info_rec_size, 0);
302 func_info = OPTS_GET(opts, func_info, NULL);
303 attr.func_info_rec_size = func_info_rec_size;
304 attr.func_info = ptr_to_u64(func_info);
305 attr.func_info_cnt = OPTS_GET(opts, func_info_cnt, 0);
306
307 line_info_rec_size = OPTS_GET(opts, line_info_rec_size, 0);
308 line_info = OPTS_GET(opts, line_info, NULL);
309 attr.line_info_rec_size = line_info_rec_size;
310 attr.line_info = ptr_to_u64(line_info);
311 attr.line_info_cnt = OPTS_GET(opts, line_info_cnt, 0);
312
313 attr.fd_array = ptr_to_u64(OPTS_GET(opts, fd_array, NULL));
314
315 if (log_level) {
316 attr.log_buf = ptr_to_u64(log_buf);
317 attr.log_size = log_size;
318 attr.log_level = log_level;
319 }
320
321 fd = sys_bpf_prog_load(&attr, attr_sz, attempts);
322 OPTS_SET(opts, log_true_size, attr.log_true_size);
323 if (fd >= 0)
324 return fd;
325
326 /* After bpf_prog_load, the kernel may modify certain attributes
327 * to give user space a hint how to deal with loading failure.
328 * Check to see whether we can make some changes and load again.
329 */
330 while (errno == E2BIG && (!finfo || !linfo)) {
331 if (!finfo && attr.func_info_cnt &&
332 attr.func_info_rec_size < func_info_rec_size) {
333 /* try with corrected func info records */
334 finfo = alloc_zero_tailing_info(func_info,
335 attr.func_info_cnt,
336 func_info_rec_size,
337 attr.func_info_rec_size);
338 if (!finfo) {
339 errno = E2BIG;
340 goto done;
341 }
342
343 attr.func_info = ptr_to_u64(finfo);
344 attr.func_info_rec_size = func_info_rec_size;
345 } else if (!linfo && attr.line_info_cnt &&
346 attr.line_info_rec_size < line_info_rec_size) {
347 linfo = alloc_zero_tailing_info(line_info,
348 attr.line_info_cnt,
349 line_info_rec_size,
350 attr.line_info_rec_size);
351 if (!linfo) {
352 errno = E2BIG;
353 goto done;
354 }
355
356 attr.line_info = ptr_to_u64(linfo);
357 attr.line_info_rec_size = line_info_rec_size;
358 } else {
359 break;
360 }
361
362 fd = sys_bpf_prog_load(&attr, attr_sz, attempts);
363 OPTS_SET(opts, log_true_size, attr.log_true_size);
364 if (fd >= 0)
365 goto done;
366 }
367
368 if (log_level == 0 && log_buf) {
369 /* log_level == 0 with non-NULL log_buf requires retrying on error
370 * with log_level == 1 and log_buf/log_buf_size set, to get details of
371 * failure
372 */
373 attr.log_buf = ptr_to_u64(log_buf);
374 attr.log_size = log_size;
375 attr.log_level = 1;
376
377 fd = sys_bpf_prog_load(&attr, attr_sz, attempts);
378 OPTS_SET(opts, log_true_size, attr.log_true_size);
379 }
380 done:
381 /* free() doesn't affect errno, so we don't need to restore it */
382 free(finfo);
383 free(linfo);
384 return libbpf_err_errno(fd);
385 }
386
387 int bpf_map_update_elem(int fd, const void *key, const void *value,
388 __u64 flags)
389 {
390 const size_t attr_sz = offsetofend(union bpf_attr, flags);
391 union bpf_attr attr;
392 int ret;
393
394 memset(&attr, 0, attr_sz);
395 attr.map_fd = fd;
396 attr.key = ptr_to_u64(key);
397 attr.value = ptr_to_u64(value);
398 attr.flags = flags;
399
400 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, attr_sz);
401 return libbpf_err_errno(ret);
402 }
403
404 int bpf_map_lookup_elem(int fd, const void *key, void *value)
405 {
406 const size_t attr_sz = offsetofend(union bpf_attr, flags);
407 union bpf_attr attr;
408 int ret;
409
410 memset(&attr, 0, attr_sz);
411 attr.map_fd = fd;
412 attr.key = ptr_to_u64(key);
413 attr.value = ptr_to_u64(value);
414
415 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz);
416 return libbpf_err_errno(ret);
417 }
418
419 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
420 {
421 const size_t attr_sz = offsetofend(union bpf_attr, flags);
422 union bpf_attr attr;
423 int ret;
424
425 memset(&attr, 0, attr_sz);
426 attr.map_fd = fd;
427 attr.key = ptr_to_u64(key);
428 attr.value = ptr_to_u64(value);
429 attr.flags = flags;
430
431 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, attr_sz);
432 return libbpf_err_errno(ret);
433 }
434
435 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
436 {
437 const size_t attr_sz = offsetofend(union bpf_attr, flags);
438 union bpf_attr attr;
439 int ret;
440
441 memset(&attr, 0, attr_sz);
442 attr.map_fd = fd;
443 attr.key = ptr_to_u64(key);
444 attr.value = ptr_to_u64(value);
445
446 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz);
447 return libbpf_err_errno(ret);
448 }
449
450 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags)
451 {
452 const size_t attr_sz = offsetofend(union bpf_attr, flags);
453 union bpf_attr attr;
454 int ret;
455
456 memset(&attr, 0, attr_sz);
457 attr.map_fd = fd;
458 attr.key = ptr_to_u64(key);
459 attr.value = ptr_to_u64(value);
460 attr.flags = flags;
461
462 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, attr_sz);
463 return libbpf_err_errno(ret);
464 }
465
466 int bpf_map_delete_elem(int fd, const void *key)
467 {
468 const size_t attr_sz = offsetofend(union bpf_attr, flags);
469 union bpf_attr attr;
470 int ret;
471
472 memset(&attr, 0, attr_sz);
473 attr.map_fd = fd;
474 attr.key = ptr_to_u64(key);
475
476 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz);
477 return libbpf_err_errno(ret);
478 }
479
480 int bpf_map_delete_elem_flags(int fd, const void *key, __u64 flags)
481 {
482 const size_t attr_sz = offsetofend(union bpf_attr, flags);
483 union bpf_attr attr;
484 int ret;
485
486 memset(&attr, 0, attr_sz);
487 attr.map_fd = fd;
488 attr.key = ptr_to_u64(key);
489 attr.flags = flags;
490
491 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, attr_sz);
492 return libbpf_err_errno(ret);
493 }
494
495 int bpf_map_get_next_key(int fd, const void *key, void *next_key)
496 {
497 const size_t attr_sz = offsetofend(union bpf_attr, next_key);
498 union bpf_attr attr;
499 int ret;
500
501 memset(&attr, 0, attr_sz);
502 attr.map_fd = fd;
503 attr.key = ptr_to_u64(key);
504 attr.next_key = ptr_to_u64(next_key);
505
506 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, attr_sz);
507 return libbpf_err_errno(ret);
508 }
509
510 int bpf_map_freeze(int fd)
511 {
512 const size_t attr_sz = offsetofend(union bpf_attr, map_fd);
513 union bpf_attr attr;
514 int ret;
515
516 memset(&attr, 0, attr_sz);
517 attr.map_fd = fd;
518
519 ret = sys_bpf(BPF_MAP_FREEZE, &attr, attr_sz);
520 return libbpf_err_errno(ret);
521 }
522
523 static int bpf_map_batch_common(int cmd, int fd, void *in_batch,
524 void *out_batch, void *keys, void *values,
525 __u32 *count,
526 const struct bpf_map_batch_opts *opts)
527 {
528 const size_t attr_sz = offsetofend(union bpf_attr, batch);
529 union bpf_attr attr;
530 int ret;
531
532 if (!OPTS_VALID(opts, bpf_map_batch_opts))
533 return libbpf_err(-EINVAL);
534
535 memset(&attr, 0, attr_sz);
536 attr.batch.map_fd = fd;
537 attr.batch.in_batch = ptr_to_u64(in_batch);
538 attr.batch.out_batch = ptr_to_u64(out_batch);
539 attr.batch.keys = ptr_to_u64(keys);
540 attr.batch.values = ptr_to_u64(values);
541 attr.batch.count = *count;
542 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0);
543 attr.batch.flags = OPTS_GET(opts, flags, 0);
544
545 ret = sys_bpf(cmd, &attr, attr_sz);
546 *count = attr.batch.count;
547
548 return libbpf_err_errno(ret);
549 }
550
551 int bpf_map_delete_batch(int fd, const void *keys, __u32 *count,
552 const struct bpf_map_batch_opts *opts)
553 {
554 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
555 NULL, (void *)keys, NULL, count, opts);
556 }
557
558 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
559 void *values, __u32 *count,
560 const struct bpf_map_batch_opts *opts)
561 {
562 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
563 out_batch, keys, values, count, opts);
564 }
565
566 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
567 void *keys, void *values, __u32 *count,
568 const struct bpf_map_batch_opts *opts)
569 {
570 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
571 fd, in_batch, out_batch, keys, values,
572 count, opts);
573 }
574
575 int bpf_map_update_batch(int fd, const void *keys, const void *values, __u32 *count,
576 const struct bpf_map_batch_opts *opts)
577 {
578 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
579 (void *)keys, (void *)values, count, opts);
580 }
581
582 int bpf_obj_pin_opts(int fd, const char *pathname, const struct bpf_obj_pin_opts *opts)
583 {
584 const size_t attr_sz = offsetofend(union bpf_attr, path_fd);
585 union bpf_attr attr;
586 int ret;
587
588 if (!OPTS_VALID(opts, bpf_obj_pin_opts))
589 return libbpf_err(-EINVAL);
590
591 memset(&attr, 0, attr_sz);
592 attr.path_fd = OPTS_GET(opts, path_fd, 0);
593 attr.pathname = ptr_to_u64((void *)pathname);
594 attr.file_flags = OPTS_GET(opts, file_flags, 0);
595 attr.bpf_fd = fd;
596
597 ret = sys_bpf(BPF_OBJ_PIN, &attr, attr_sz);
598 return libbpf_err_errno(ret);
599 }
600
601 int bpf_obj_pin(int fd, const char *pathname)
602 {
603 return bpf_obj_pin_opts(fd, pathname, NULL);
604 }
605
606 int bpf_obj_get(const char *pathname)
607 {
608 return bpf_obj_get_opts(pathname, NULL);
609 }
610
611 int bpf_obj_get_opts(const char *pathname, const struct bpf_obj_get_opts *opts)
612 {
613 const size_t attr_sz = offsetofend(union bpf_attr, path_fd);
614 union bpf_attr attr;
615 int fd;
616
617 if (!OPTS_VALID(opts, bpf_obj_get_opts))
618 return libbpf_err(-EINVAL);
619
620 memset(&attr, 0, attr_sz);
621 attr.path_fd = OPTS_GET(opts, path_fd, 0);
622 attr.pathname = ptr_to_u64((void *)pathname);
623 attr.file_flags = OPTS_GET(opts, file_flags, 0);
624
625 fd = sys_bpf_fd(BPF_OBJ_GET, &attr, attr_sz);
626 return libbpf_err_errno(fd);
627 }
628
629 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
630 unsigned int flags)
631 {
632 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts,
633 .flags = flags,
634 );
635
636 return bpf_prog_attach_opts(prog_fd, target_fd, type, &opts);
637 }
638
639 int bpf_prog_attach_opts(int prog_fd, int target, enum bpf_attach_type type,
640 const struct bpf_prog_attach_opts *opts)
641 {
642 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision);
643 __u32 relative_id, flags;
644 int ret, relative_fd;
645 union bpf_attr attr;
646
647 if (!OPTS_VALID(opts, bpf_prog_attach_opts))
648 return libbpf_err(-EINVAL);
649
650 relative_id = OPTS_GET(opts, relative_id, 0);
651 relative_fd = OPTS_GET(opts, relative_fd, 0);
652 flags = OPTS_GET(opts, flags, 0);
653
654 /* validate we don't have unexpected combinations of non-zero fields */
655 if (relative_fd && relative_id)
656 return libbpf_err(-EINVAL);
657
658 memset(&attr, 0, attr_sz);
659 attr.target_fd = target;
660 attr.attach_bpf_fd = prog_fd;
661 attr.attach_type = type;
662 attr.replace_bpf_fd = OPTS_GET(opts, replace_fd, 0);
663 attr.expected_revision = OPTS_GET(opts, expected_revision, 0);
664
665 if (relative_id) {
666 attr.attach_flags = flags | BPF_F_ID;
667 attr.relative_id = relative_id;
668 } else {
669 attr.attach_flags = flags;
670 attr.relative_fd = relative_fd;
671 }
672
673 ret = sys_bpf(BPF_PROG_ATTACH, &attr, attr_sz);
674 return libbpf_err_errno(ret);
675 }
676
677 int bpf_prog_detach_opts(int prog_fd, int target, enum bpf_attach_type type,
678 const struct bpf_prog_detach_opts *opts)
679 {
680 const size_t attr_sz = offsetofend(union bpf_attr, expected_revision);
681 __u32 relative_id, flags;
682 int ret, relative_fd;
683 union bpf_attr attr;
684
685 if (!OPTS_VALID(opts, bpf_prog_detach_opts))
686 return libbpf_err(-EINVAL);
687
688 relative_id = OPTS_GET(opts, relative_id, 0);
689 relative_fd = OPTS_GET(opts, relative_fd, 0);
690 flags = OPTS_GET(opts, flags, 0);
691
692 /* validate we don't have unexpected combinations of non-zero fields */
693 if (relative_fd && relative_id)
694 return libbpf_err(-EINVAL);
695
696 memset(&attr, 0, attr_sz);
697 attr.target_fd = target;
698 attr.attach_bpf_fd = prog_fd;
699 attr.attach_type = type;
700 attr.expected_revision = OPTS_GET(opts, expected_revision, 0);
701
702 if (relative_id) {
703 attr.attach_flags = flags | BPF_F_ID;
704 attr.relative_id = relative_id;
705 } else {
706 attr.attach_flags = flags;
707 attr.relative_fd = relative_fd;
708 }
709
710 ret = sys_bpf(BPF_PROG_DETACH, &attr, attr_sz);
711 return libbpf_err_errno(ret);
712 }
713
714 int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
715 {
716 return bpf_prog_detach_opts(0, target_fd, type, NULL);
717 }
718
719 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
720 {
721 return bpf_prog_detach_opts(prog_fd, target_fd, type, NULL);
722 }
723
724 int bpf_link_create(int prog_fd, int target_fd,
725 enum bpf_attach_type attach_type,
726 const struct bpf_link_create_opts *opts)
727 {
728 const size_t attr_sz = offsetofend(union bpf_attr, link_create);
729 __u32 target_btf_id, iter_info_len, relative_id;
730 int fd, err, relative_fd;
731 union bpf_attr attr;
732
733 if (!OPTS_VALID(opts, bpf_link_create_opts))
734 return libbpf_err(-EINVAL);
735
736 iter_info_len = OPTS_GET(opts, iter_info_len, 0);
737 target_btf_id = OPTS_GET(opts, target_btf_id, 0);
738
739 /* validate we don't have unexpected combinations of non-zero fields */
740 if (iter_info_len || target_btf_id) {
741 if (iter_info_len && target_btf_id)
742 return libbpf_err(-EINVAL);
743 if (!OPTS_ZEROED(opts, target_btf_id))
744 return libbpf_err(-EINVAL);
745 }
746
747 memset(&attr, 0, attr_sz);
748 attr.link_create.prog_fd = prog_fd;
749 attr.link_create.target_fd = target_fd;
750 attr.link_create.attach_type = attach_type;
751 attr.link_create.flags = OPTS_GET(opts, flags, 0);
752
753 if (target_btf_id) {
754 attr.link_create.target_btf_id = target_btf_id;
755 goto proceed;
756 }
757
758 switch (attach_type) {
759 case BPF_TRACE_ITER:
760 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0));
761 attr.link_create.iter_info_len = iter_info_len;
762 break;
763 case BPF_PERF_EVENT:
764 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0);
765 if (!OPTS_ZEROED(opts, perf_event))
766 return libbpf_err(-EINVAL);
767 break;
768 case BPF_TRACE_KPROBE_MULTI:
769 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 }
843 proceed:
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 fentry
848 * and other similar programs
849 */
850 err = -errno;
851 if (err != -EINVAL)
852 return libbpf_err(err);
853
854 /* if user used features not supported by
855 * BPF_RAW_TRACEPOINT_OPEN command, then just give up immediately
856 */
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 be
863 * attached using BPF_RAW_TRACEPOINT_OPEN command, try that as
864 * a fallback for older kernels
865 */
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
878 int 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
891 int 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
917 int 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
930 int 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
959 int 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
978 int 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
1013 static 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
1029 int 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
1034 int 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
1039 int 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
1044 int 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
1049 int 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
1067 int bpf_prog_get_fd_by_id(__u32 id)
1068 {
1069 return bpf_prog_get_fd_by_id_opts(id, NULL);
1070 }
1071
1072 int 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
1090 int bpf_map_get_fd_by_id(__u32 id)
1091 {
1092 return bpf_map_get_fd_by_id_opts(id, NULL);
1093 }
1094
1095 int 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
1113 int bpf_btf_get_fd_by_id(__u32 id)
1114 {
1115 return bpf_btf_get_fd_by_id_opts(id, NULL);
1116 }
1117
1118 int 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
1136 int bpf_link_get_fd_by_id(__u32 id)
1137 {
1138 return bpf_link_get_fd_by_id_opts(id, NULL);
1139 }
1140
1141 int 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
1158 int 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
1163 int 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
1168 int 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
1173 int 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
1178 int 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
1196 int 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
1203 int 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 without
1235 * log_buf, but retry with log_buf and log_level=1 on error", which is
1236 * consistent across low-level and high-level BTF and program loading
1237 * APIs within libbpf and provides a sensible behavior in practice
1238 */
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
1257 int 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
1283 int 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
1296 int 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
1315 int 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
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