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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/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 "bpf.h"
32#include "libbpf.h"
33#include "libbpf_internal.h"
34
35/*
36 * When building perf, unistd.h is overridden. __NR_bpf is
37 * required to be defined explicitly.
38 */
39#ifndef __NR_bpf
40# if defined(__i386__)
41# define __NR_bpf 357
42# elif defined(__x86_64__)
43# define __NR_bpf 321
44# elif defined(__aarch64__)
45# define __NR_bpf 280
46# elif defined(__sparc__)
47# define __NR_bpf 349
48# elif defined(__s390__)
49# define __NR_bpf 351
50# elif defined(__arc__)
51# define __NR_bpf 280
52# else
53# error __NR_bpf not defined. libbpf does not support your arch.
54# endif
55#endif
56
57static inline __u64 ptr_to_u64(const void *ptr)
58{
59 return (__u64) (unsigned long) ptr;
60}
61
62static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
63 unsigned int size)
64{
65 return syscall(__NR_bpf, cmd, attr, size);
66}
67
68static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
69{
70 int fd;
71
72 do {
73 fd = sys_bpf(BPF_PROG_LOAD, attr, size);
74 } while (fd < 0 && errno == EAGAIN);
75
76 return fd;
77}
78
79int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
80{
81 union bpf_attr attr;
82
83 memset(&attr, '\0', sizeof(attr));
84
85 attr.map_type = create_attr->map_type;
86 attr.key_size = create_attr->key_size;
87 attr.value_size = create_attr->value_size;
88 attr.max_entries = create_attr->max_entries;
89 attr.map_flags = create_attr->map_flags;
90 if (create_attr->name)
91 memcpy(attr.map_name, create_attr->name,
92 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
93 attr.numa_node = create_attr->numa_node;
94 attr.btf_fd = create_attr->btf_fd;
95 attr.btf_key_type_id = create_attr->btf_key_type_id;
96 attr.btf_value_type_id = create_attr->btf_value_type_id;
97 attr.map_ifindex = create_attr->map_ifindex;
98 attr.inner_map_fd = create_attr->inner_map_fd;
99
100 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
101}
102
103int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
104 int key_size, int value_size, int max_entries,
105 __u32 map_flags, int node)
106{
107 struct bpf_create_map_attr map_attr = {};
108
109 map_attr.name = name;
110 map_attr.map_type = map_type;
111 map_attr.map_flags = map_flags;
112 map_attr.key_size = key_size;
113 map_attr.value_size = value_size;
114 map_attr.max_entries = max_entries;
115 if (node >= 0) {
116 map_attr.numa_node = node;
117 map_attr.map_flags |= BPF_F_NUMA_NODE;
118 }
119
120 return bpf_create_map_xattr(&map_attr);
121}
122
123int bpf_create_map(enum bpf_map_type map_type, int key_size,
124 int value_size, int max_entries, __u32 map_flags)
125{
126 struct bpf_create_map_attr map_attr = {};
127
128 map_attr.map_type = map_type;
129 map_attr.map_flags = map_flags;
130 map_attr.key_size = key_size;
131 map_attr.value_size = value_size;
132 map_attr.max_entries = max_entries;
133
134 return bpf_create_map_xattr(&map_attr);
135}
136
137int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
138 int key_size, int value_size, int max_entries,
139 __u32 map_flags)
140{
141 struct bpf_create_map_attr map_attr = {};
142
143 map_attr.name = name;
144 map_attr.map_type = map_type;
145 map_attr.map_flags = map_flags;
146 map_attr.key_size = key_size;
147 map_attr.value_size = value_size;
148 map_attr.max_entries = max_entries;
149
150 return bpf_create_map_xattr(&map_attr);
151}
152
153int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
154 int key_size, int inner_map_fd, int max_entries,
155 __u32 map_flags, int node)
156{
157 union bpf_attr attr;
158
159 memset(&attr, '\0', sizeof(attr));
160
161 attr.map_type = map_type;
162 attr.key_size = key_size;
163 attr.value_size = 4;
164 attr.inner_map_fd = inner_map_fd;
165 attr.max_entries = max_entries;
166 attr.map_flags = map_flags;
167 if (name)
168 memcpy(attr.map_name, name,
169 min(strlen(name), BPF_OBJ_NAME_LEN - 1));
170
171 if (node >= 0) {
172 attr.map_flags |= BPF_F_NUMA_NODE;
173 attr.numa_node = node;
174 }
175
176 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
177}
178
179int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
180 int key_size, int inner_map_fd, int max_entries,
181 __u32 map_flags)
182{
183 return bpf_create_map_in_map_node(map_type, name, key_size,
184 inner_map_fd, max_entries, map_flags,
185 -1);
186}
187
188static void *
189alloc_zero_tailing_info(const void *orecord, __u32 cnt,
190 __u32 actual_rec_size, __u32 expected_rec_size)
191{
192 __u64 info_len = actual_rec_size * cnt;
193 void *info, *nrecord;
194 int i;
195
196 info = malloc(info_len);
197 if (!info)
198 return NULL;
199
200 /* zero out bytes kernel does not understand */
201 nrecord = info;
202 for (i = 0; i < cnt; i++) {
203 memcpy(nrecord, orecord, expected_rec_size);
204 memset(nrecord + expected_rec_size, 0,
205 actual_rec_size - expected_rec_size);
206 orecord += actual_rec_size;
207 nrecord += actual_rec_size;
208 }
209
210 return info;
211}
212
213int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
214 char *log_buf, size_t log_buf_sz)
215{
216 void *finfo = NULL, *linfo = NULL;
217 union bpf_attr attr;
218 __u32 log_level;
219 int fd;
220
221 if (!load_attr || !log_buf != !log_buf_sz)
222 return -EINVAL;
223
224 log_level = load_attr->log_level;
225 if (log_level > (4 | 2 | 1) || (log_level && !log_buf))
226 return -EINVAL;
227
228 memset(&attr, 0, sizeof(attr));
229 attr.prog_type = load_attr->prog_type;
230 attr.expected_attach_type = load_attr->expected_attach_type;
231 attr.insn_cnt = (__u32)load_attr->insns_cnt;
232 attr.insns = ptr_to_u64(load_attr->insns);
233 attr.license = ptr_to_u64(load_attr->license);
234
235 attr.log_level = log_level;
236 if (log_level) {
237 attr.log_buf = ptr_to_u64(log_buf);
238 attr.log_size = log_buf_sz;
239 } else {
240 attr.log_buf = ptr_to_u64(NULL);
241 attr.log_size = 0;
242 }
243
244 attr.kern_version = load_attr->kern_version;
245 attr.prog_ifindex = load_attr->prog_ifindex;
246 attr.prog_btf_fd = load_attr->prog_btf_fd;
247 attr.func_info_rec_size = load_attr->func_info_rec_size;
248 attr.func_info_cnt = load_attr->func_info_cnt;
249 attr.func_info = ptr_to_u64(load_attr->func_info);
250 attr.line_info_rec_size = load_attr->line_info_rec_size;
251 attr.line_info_cnt = load_attr->line_info_cnt;
252 attr.line_info = ptr_to_u64(load_attr->line_info);
253 if (load_attr->name)
254 memcpy(attr.prog_name, load_attr->name,
255 min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1));
256 attr.prog_flags = load_attr->prog_flags;
257
258 fd = sys_bpf_prog_load(&attr, sizeof(attr));
259 if (fd >= 0)
260 return fd;
261
262 /* After bpf_prog_load, the kernel may modify certain attributes
263 * to give user space a hint how to deal with loading failure.
264 * Check to see whether we can make some changes and load again.
265 */
266 while (errno == E2BIG && (!finfo || !linfo)) {
267 if (!finfo && attr.func_info_cnt &&
268 attr.func_info_rec_size < load_attr->func_info_rec_size) {
269 /* try with corrected func info records */
270 finfo = alloc_zero_tailing_info(load_attr->func_info,
271 load_attr->func_info_cnt,
272 load_attr->func_info_rec_size,
273 attr.func_info_rec_size);
274 if (!finfo)
275 goto done;
276
277 attr.func_info = ptr_to_u64(finfo);
278 attr.func_info_rec_size = load_attr->func_info_rec_size;
279 } else if (!linfo && attr.line_info_cnt &&
280 attr.line_info_rec_size <
281 load_attr->line_info_rec_size) {
282 linfo = alloc_zero_tailing_info(load_attr->line_info,
283 load_attr->line_info_cnt,
284 load_attr->line_info_rec_size,
285 attr.line_info_rec_size);
286 if (!linfo)
287 goto done;
288
289 attr.line_info = ptr_to_u64(linfo);
290 attr.line_info_rec_size = load_attr->line_info_rec_size;
291 } else {
292 break;
293 }
294
295 fd = sys_bpf_prog_load(&attr, sizeof(attr));
296
297 if (fd >= 0)
298 goto done;
299 }
300
301 if (log_level || !log_buf)
302 goto done;
303
304 /* Try again with log */
305 attr.log_buf = ptr_to_u64(log_buf);
306 attr.log_size = log_buf_sz;
307 attr.log_level = 1;
308 log_buf[0] = 0;
309 fd = sys_bpf_prog_load(&attr, sizeof(attr));
310done:
311 free(finfo);
312 free(linfo);
313 return fd;
314}
315
316int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
317 size_t insns_cnt, const char *license,
318 __u32 kern_version, char *log_buf,
319 size_t log_buf_sz)
320{
321 struct bpf_load_program_attr load_attr;
322
323 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
324 load_attr.prog_type = type;
325 load_attr.expected_attach_type = 0;
326 load_attr.name = NULL;
327 load_attr.insns = insns;
328 load_attr.insns_cnt = insns_cnt;
329 load_attr.license = license;
330 load_attr.kern_version = kern_version;
331
332 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
333}
334
335int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
336 size_t insns_cnt, __u32 prog_flags, const char *license,
337 __u32 kern_version, char *log_buf, size_t log_buf_sz,
338 int log_level)
339{
340 union bpf_attr attr;
341
342 memset(&attr, 0, sizeof(attr));
343 attr.prog_type = type;
344 attr.insn_cnt = (__u32)insns_cnt;
345 attr.insns = ptr_to_u64(insns);
346 attr.license = ptr_to_u64(license);
347 attr.log_buf = ptr_to_u64(log_buf);
348 attr.log_size = log_buf_sz;
349 attr.log_level = log_level;
350 log_buf[0] = 0;
351 attr.kern_version = kern_version;
352 attr.prog_flags = prog_flags;
353
354 return sys_bpf_prog_load(&attr, sizeof(attr));
355}
356
357int bpf_map_update_elem(int fd, const void *key, const void *value,
358 __u64 flags)
359{
360 union bpf_attr attr;
361
362 memset(&attr, 0, sizeof(attr));
363 attr.map_fd = fd;
364 attr.key = ptr_to_u64(key);
365 attr.value = ptr_to_u64(value);
366 attr.flags = flags;
367
368 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
369}
370
371int bpf_map_lookup_elem(int fd, const void *key, void *value)
372{
373 union bpf_attr attr;
374
375 memset(&attr, 0, sizeof(attr));
376 attr.map_fd = fd;
377 attr.key = ptr_to_u64(key);
378 attr.value = ptr_to_u64(value);
379
380 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
381}
382
383int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
384{
385 union bpf_attr attr;
386
387 memset(&attr, 0, sizeof(attr));
388 attr.map_fd = fd;
389 attr.key = ptr_to_u64(key);
390 attr.value = ptr_to_u64(value);
391 attr.flags = flags;
392
393 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
394}
395
396int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
397{
398 union bpf_attr attr;
399
400 memset(&attr, 0, sizeof(attr));
401 attr.map_fd = fd;
402 attr.key = ptr_to_u64(key);
403 attr.value = ptr_to_u64(value);
404
405 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
406}
407
408int bpf_map_delete_elem(int fd, const void *key)
409{
410 union bpf_attr attr;
411
412 memset(&attr, 0, sizeof(attr));
413 attr.map_fd = fd;
414 attr.key = ptr_to_u64(key);
415
416 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
417}
418
419int bpf_map_get_next_key(int fd, const void *key, void *next_key)
420{
421 union bpf_attr attr;
422
423 memset(&attr, 0, sizeof(attr));
424 attr.map_fd = fd;
425 attr.key = ptr_to_u64(key);
426 attr.next_key = ptr_to_u64(next_key);
427
428 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
429}
430
431int bpf_map_freeze(int fd)
432{
433 union bpf_attr attr;
434
435 memset(&attr, 0, sizeof(attr));
436 attr.map_fd = fd;
437
438 return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
439}
440
441int bpf_obj_pin(int fd, const char *pathname)
442{
443 union bpf_attr attr;
444
445 memset(&attr, 0, sizeof(attr));
446 attr.pathname = ptr_to_u64((void *)pathname);
447 attr.bpf_fd = fd;
448
449 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
450}
451
452int bpf_obj_get(const char *pathname)
453{
454 union bpf_attr attr;
455
456 memset(&attr, 0, sizeof(attr));
457 attr.pathname = ptr_to_u64((void *)pathname);
458
459 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
460}
461
462int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
463 unsigned int flags)
464{
465 union bpf_attr attr;
466
467 memset(&attr, 0, sizeof(attr));
468 attr.target_fd = target_fd;
469 attr.attach_bpf_fd = prog_fd;
470 attr.attach_type = type;
471 attr.attach_flags = flags;
472
473 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
474}
475
476int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
477{
478 union bpf_attr attr;
479
480 memset(&attr, 0, sizeof(attr));
481 attr.target_fd = target_fd;
482 attr.attach_type = type;
483
484 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
485}
486
487int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
488{
489 union bpf_attr attr;
490
491 memset(&attr, 0, sizeof(attr));
492 attr.target_fd = target_fd;
493 attr.attach_bpf_fd = prog_fd;
494 attr.attach_type = type;
495
496 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
497}
498
499int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
500 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
501{
502 union bpf_attr attr;
503 int ret;
504
505 memset(&attr, 0, sizeof(attr));
506 attr.query.target_fd = target_fd;
507 attr.query.attach_type = type;
508 attr.query.query_flags = query_flags;
509 attr.query.prog_cnt = *prog_cnt;
510 attr.query.prog_ids = ptr_to_u64(prog_ids);
511
512 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
513 if (attach_flags)
514 *attach_flags = attr.query.attach_flags;
515 *prog_cnt = attr.query.prog_cnt;
516 return ret;
517}
518
519int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
520 void *data_out, __u32 *size_out, __u32 *retval,
521 __u32 *duration)
522{
523 union bpf_attr attr;
524 int ret;
525
526 memset(&attr, 0, sizeof(attr));
527 attr.test.prog_fd = prog_fd;
528 attr.test.data_in = ptr_to_u64(data);
529 attr.test.data_out = ptr_to_u64(data_out);
530 attr.test.data_size_in = size;
531 attr.test.repeat = repeat;
532
533 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
534 if (size_out)
535 *size_out = attr.test.data_size_out;
536 if (retval)
537 *retval = attr.test.retval;
538 if (duration)
539 *duration = attr.test.duration;
540 return ret;
541}
542
543int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
544{
545 union bpf_attr attr;
546 int ret;
547
548 if (!test_attr->data_out && test_attr->data_size_out > 0)
549 return -EINVAL;
550
551 memset(&attr, 0, sizeof(attr));
552 attr.test.prog_fd = test_attr->prog_fd;
553 attr.test.data_in = ptr_to_u64(test_attr->data_in);
554 attr.test.data_out = ptr_to_u64(test_attr->data_out);
555 attr.test.data_size_in = test_attr->data_size_in;
556 attr.test.data_size_out = test_attr->data_size_out;
557 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in);
558 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out);
559 attr.test.ctx_size_in = test_attr->ctx_size_in;
560 attr.test.ctx_size_out = test_attr->ctx_size_out;
561 attr.test.repeat = test_attr->repeat;
562
563 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
564 test_attr->data_size_out = attr.test.data_size_out;
565 test_attr->ctx_size_out = attr.test.ctx_size_out;
566 test_attr->retval = attr.test.retval;
567 test_attr->duration = attr.test.duration;
568 return ret;
569}
570
571static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)
572{
573 union bpf_attr attr;
574 int err;
575
576 memset(&attr, 0, sizeof(attr));
577 attr.start_id = start_id;
578
579 err = sys_bpf(cmd, &attr, sizeof(attr));
580 if (!err)
581 *next_id = attr.next_id;
582
583 return err;
584}
585
586int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
587{
588 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID);
589}
590
591int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
592{
593 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);
594}
595
596int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
597{
598 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
599}
600
601int bpf_prog_get_fd_by_id(__u32 id)
602{
603 union bpf_attr attr;
604
605 memset(&attr, 0, sizeof(attr));
606 attr.prog_id = id;
607
608 return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
609}
610
611int bpf_map_get_fd_by_id(__u32 id)
612{
613 union bpf_attr attr;
614
615 memset(&attr, 0, sizeof(attr));
616 attr.map_id = id;
617
618 return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
619}
620
621int bpf_btf_get_fd_by_id(__u32 id)
622{
623 union bpf_attr attr;
624
625 memset(&attr, 0, sizeof(attr));
626 attr.btf_id = id;
627
628 return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
629}
630
631int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
632{
633 union bpf_attr attr;
634 int err;
635
636 memset(&attr, 0, sizeof(attr));
637 attr.info.bpf_fd = prog_fd;
638 attr.info.info_len = *info_len;
639 attr.info.info = ptr_to_u64(info);
640
641 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
642 if (!err)
643 *info_len = attr.info.info_len;
644
645 return err;
646}
647
648int bpf_raw_tracepoint_open(const char *name, int prog_fd)
649{
650 union bpf_attr attr;
651
652 memset(&attr, 0, sizeof(attr));
653 attr.raw_tracepoint.name = ptr_to_u64(name);
654 attr.raw_tracepoint.prog_fd = prog_fd;
655
656 return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
657}
658
659int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
660 bool do_log)
661{
662 union bpf_attr attr = {};
663 int fd;
664
665 attr.btf = ptr_to_u64(btf);
666 attr.btf_size = btf_size;
667
668retry:
669 if (do_log && log_buf && log_buf_size) {
670 attr.btf_log_level = 1;
671 attr.btf_log_size = log_buf_size;
672 attr.btf_log_buf = ptr_to_u64(log_buf);
673 }
674
675 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
676 if (fd == -1 && !do_log && log_buf && log_buf_size) {
677 do_log = true;
678 goto retry;
679 }
680
681 return fd;
682}
683
684int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
685 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,
686 __u64 *probe_addr)
687{
688 union bpf_attr attr = {};
689 int err;
690
691 attr.task_fd_query.pid = pid;
692 attr.task_fd_query.fd = fd;
693 attr.task_fd_query.flags = flags;
694 attr.task_fd_query.buf = ptr_to_u64(buf);
695 attr.task_fd_query.buf_len = *buf_len;
696
697 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
698 *buf_len = attr.task_fd_query.buf_len;
699 *prog_id = attr.task_fd_query.prog_id;
700 *fd_type = attr.task_fd_query.fd_type;
701 *probe_offset = attr.task_fd_query.probe_offset;
702 *probe_addr = attr.task_fd_query.probe_addr;
703
704 return err;
705}
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 "bpf.h"
32#include "libbpf.h"
33#include "libbpf_internal.h"
34
35/*
36 * When building perf, unistd.h is overridden. __NR_bpf is
37 * required to be defined explicitly.
38 */
39#ifndef __NR_bpf
40# if defined(__i386__)
41# define __NR_bpf 357
42# elif defined(__x86_64__)
43# define __NR_bpf 321
44# elif defined(__aarch64__)
45# define __NR_bpf 280
46# elif defined(__sparc__)
47# define __NR_bpf 349
48# elif defined(__s390__)
49# define __NR_bpf 351
50# elif defined(__arc__)
51# define __NR_bpf 280
52# else
53# error __NR_bpf not defined. libbpf does not support your arch.
54# endif
55#endif
56
57static inline __u64 ptr_to_u64(const void *ptr)
58{
59 return (__u64) (unsigned long) ptr;
60}
61
62static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
63 unsigned int size)
64{
65 return syscall(__NR_bpf, cmd, attr, size);
66}
67
68static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
69{
70 int retries = 5;
71 int fd;
72
73 do {
74 fd = sys_bpf(BPF_PROG_LOAD, attr, size);
75 } while (fd < 0 && errno == EAGAIN && retries-- > 0);
76
77 return fd;
78}
79
80int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
81{
82 union bpf_attr attr;
83 int fd;
84
85 memset(&attr, '\0', sizeof(attr));
86
87 attr.map_type = create_attr->map_type;
88 attr.key_size = create_attr->key_size;
89 attr.value_size = create_attr->value_size;
90 attr.max_entries = create_attr->max_entries;
91 attr.map_flags = create_attr->map_flags;
92 if (create_attr->name)
93 memcpy(attr.map_name, create_attr->name,
94 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
95 attr.numa_node = create_attr->numa_node;
96 attr.btf_fd = create_attr->btf_fd;
97 attr.btf_key_type_id = create_attr->btf_key_type_id;
98 attr.btf_value_type_id = create_attr->btf_value_type_id;
99 attr.map_ifindex = create_attr->map_ifindex;
100 if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS)
101 attr.btf_vmlinux_value_type_id =
102 create_attr->btf_vmlinux_value_type_id;
103 else
104 attr.inner_map_fd = create_attr->inner_map_fd;
105
106 fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
107 return libbpf_err_errno(fd);
108}
109
110int bpf_create_map_node(enum bpf_map_type map_type, const char *name,
111 int key_size, int value_size, int max_entries,
112 __u32 map_flags, int node)
113{
114 struct bpf_create_map_attr map_attr = {};
115
116 map_attr.name = name;
117 map_attr.map_type = map_type;
118 map_attr.map_flags = map_flags;
119 map_attr.key_size = key_size;
120 map_attr.value_size = value_size;
121 map_attr.max_entries = max_entries;
122 if (node >= 0) {
123 map_attr.numa_node = node;
124 map_attr.map_flags |= BPF_F_NUMA_NODE;
125 }
126
127 return bpf_create_map_xattr(&map_attr);
128}
129
130int bpf_create_map(enum bpf_map_type map_type, int key_size,
131 int value_size, int max_entries, __u32 map_flags)
132{
133 struct bpf_create_map_attr map_attr = {};
134
135 map_attr.map_type = map_type;
136 map_attr.map_flags = map_flags;
137 map_attr.key_size = key_size;
138 map_attr.value_size = value_size;
139 map_attr.max_entries = max_entries;
140
141 return bpf_create_map_xattr(&map_attr);
142}
143
144int bpf_create_map_name(enum bpf_map_type map_type, const char *name,
145 int key_size, int value_size, int max_entries,
146 __u32 map_flags)
147{
148 struct bpf_create_map_attr map_attr = {};
149
150 map_attr.name = name;
151 map_attr.map_type = map_type;
152 map_attr.map_flags = map_flags;
153 map_attr.key_size = key_size;
154 map_attr.value_size = value_size;
155 map_attr.max_entries = max_entries;
156
157 return bpf_create_map_xattr(&map_attr);
158}
159
160int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name,
161 int key_size, int inner_map_fd, int max_entries,
162 __u32 map_flags, int node)
163{
164 union bpf_attr attr;
165 int fd;
166
167 memset(&attr, '\0', sizeof(attr));
168
169 attr.map_type = map_type;
170 attr.key_size = key_size;
171 attr.value_size = 4;
172 attr.inner_map_fd = inner_map_fd;
173 attr.max_entries = max_entries;
174 attr.map_flags = map_flags;
175 if (name)
176 memcpy(attr.map_name, name,
177 min(strlen(name), BPF_OBJ_NAME_LEN - 1));
178
179 if (node >= 0) {
180 attr.map_flags |= BPF_F_NUMA_NODE;
181 attr.numa_node = node;
182 }
183
184 fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
185 return libbpf_err_errno(fd);
186}
187
188int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name,
189 int key_size, int inner_map_fd, int max_entries,
190 __u32 map_flags)
191{
192 return bpf_create_map_in_map_node(map_type, name, key_size,
193 inner_map_fd, max_entries, map_flags,
194 -1);
195}
196
197static void *
198alloc_zero_tailing_info(const void *orecord, __u32 cnt,
199 __u32 actual_rec_size, __u32 expected_rec_size)
200{
201 __u64 info_len = (__u64)actual_rec_size * cnt;
202 void *info, *nrecord;
203 int i;
204
205 info = malloc(info_len);
206 if (!info)
207 return NULL;
208
209 /* zero out bytes kernel does not understand */
210 nrecord = info;
211 for (i = 0; i < cnt; i++) {
212 memcpy(nrecord, orecord, expected_rec_size);
213 memset(nrecord + expected_rec_size, 0,
214 actual_rec_size - expected_rec_size);
215 orecord += actual_rec_size;
216 nrecord += actual_rec_size;
217 }
218
219 return info;
220}
221
222int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr)
223{
224 void *finfo = NULL, *linfo = NULL;
225 union bpf_attr attr;
226 int fd;
227
228 if (!load_attr->log_buf != !load_attr->log_buf_sz)
229 return libbpf_err(-EINVAL);
230
231 if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf))
232 return libbpf_err(-EINVAL);
233
234 memset(&attr, 0, sizeof(attr));
235 attr.prog_type = load_attr->prog_type;
236 attr.expected_attach_type = load_attr->expected_attach_type;
237
238 if (load_attr->attach_prog_fd)
239 attr.attach_prog_fd = load_attr->attach_prog_fd;
240 else
241 attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd;
242 attr.attach_btf_id = load_attr->attach_btf_id;
243
244 attr.prog_ifindex = load_attr->prog_ifindex;
245 attr.kern_version = load_attr->kern_version;
246
247 attr.insn_cnt = (__u32)load_attr->insn_cnt;
248 attr.insns = ptr_to_u64(load_attr->insns);
249 attr.license = ptr_to_u64(load_attr->license);
250
251 attr.log_level = load_attr->log_level;
252 if (attr.log_level) {
253 attr.log_buf = ptr_to_u64(load_attr->log_buf);
254 attr.log_size = load_attr->log_buf_sz;
255 }
256
257 attr.prog_btf_fd = load_attr->prog_btf_fd;
258 attr.prog_flags = load_attr->prog_flags;
259
260 attr.func_info_rec_size = load_attr->func_info_rec_size;
261 attr.func_info_cnt = load_attr->func_info_cnt;
262 attr.func_info = ptr_to_u64(load_attr->func_info);
263
264 attr.line_info_rec_size = load_attr->line_info_rec_size;
265 attr.line_info_cnt = load_attr->line_info_cnt;
266 attr.line_info = ptr_to_u64(load_attr->line_info);
267
268 if (load_attr->name)
269 memcpy(attr.prog_name, load_attr->name,
270 min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1));
271
272 fd = sys_bpf_prog_load(&attr, sizeof(attr));
273 if (fd >= 0)
274 return fd;
275
276 /* After bpf_prog_load, the kernel may modify certain attributes
277 * to give user space a hint how to deal with loading failure.
278 * Check to see whether we can make some changes and load again.
279 */
280 while (errno == E2BIG && (!finfo || !linfo)) {
281 if (!finfo && attr.func_info_cnt &&
282 attr.func_info_rec_size < load_attr->func_info_rec_size) {
283 /* try with corrected func info records */
284 finfo = alloc_zero_tailing_info(load_attr->func_info,
285 load_attr->func_info_cnt,
286 load_attr->func_info_rec_size,
287 attr.func_info_rec_size);
288 if (!finfo) {
289 errno = E2BIG;
290 goto done;
291 }
292
293 attr.func_info = ptr_to_u64(finfo);
294 attr.func_info_rec_size = load_attr->func_info_rec_size;
295 } else if (!linfo && attr.line_info_cnt &&
296 attr.line_info_rec_size <
297 load_attr->line_info_rec_size) {
298 linfo = alloc_zero_tailing_info(load_attr->line_info,
299 load_attr->line_info_cnt,
300 load_attr->line_info_rec_size,
301 attr.line_info_rec_size);
302 if (!linfo) {
303 errno = E2BIG;
304 goto done;
305 }
306
307 attr.line_info = ptr_to_u64(linfo);
308 attr.line_info_rec_size = load_attr->line_info_rec_size;
309 } else {
310 break;
311 }
312
313 fd = sys_bpf_prog_load(&attr, sizeof(attr));
314 if (fd >= 0)
315 goto done;
316 }
317
318 if (load_attr->log_level || !load_attr->log_buf)
319 goto done;
320
321 /* Try again with log */
322 attr.log_buf = ptr_to_u64(load_attr->log_buf);
323 attr.log_size = load_attr->log_buf_sz;
324 attr.log_level = 1;
325 load_attr->log_buf[0] = 0;
326
327 fd = sys_bpf_prog_load(&attr, sizeof(attr));
328done:
329 /* free() doesn't affect errno, so we don't need to restore it */
330 free(finfo);
331 free(linfo);
332 return libbpf_err_errno(fd);
333}
334
335int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
336 char *log_buf, size_t log_buf_sz)
337{
338 struct bpf_prog_load_params p = {};
339
340 if (!load_attr || !log_buf != !log_buf_sz)
341 return libbpf_err(-EINVAL);
342
343 p.prog_type = load_attr->prog_type;
344 p.expected_attach_type = load_attr->expected_attach_type;
345 switch (p.prog_type) {
346 case BPF_PROG_TYPE_STRUCT_OPS:
347 case BPF_PROG_TYPE_LSM:
348 p.attach_btf_id = load_attr->attach_btf_id;
349 break;
350 case BPF_PROG_TYPE_TRACING:
351 case BPF_PROG_TYPE_EXT:
352 p.attach_btf_id = load_attr->attach_btf_id;
353 p.attach_prog_fd = load_attr->attach_prog_fd;
354 break;
355 default:
356 p.prog_ifindex = load_attr->prog_ifindex;
357 p.kern_version = load_attr->kern_version;
358 }
359 p.insn_cnt = load_attr->insns_cnt;
360 p.insns = load_attr->insns;
361 p.license = load_attr->license;
362 p.log_level = load_attr->log_level;
363 p.log_buf = log_buf;
364 p.log_buf_sz = log_buf_sz;
365 p.prog_btf_fd = load_attr->prog_btf_fd;
366 p.func_info_rec_size = load_attr->func_info_rec_size;
367 p.func_info_cnt = load_attr->func_info_cnt;
368 p.func_info = load_attr->func_info;
369 p.line_info_rec_size = load_attr->line_info_rec_size;
370 p.line_info_cnt = load_attr->line_info_cnt;
371 p.line_info = load_attr->line_info;
372 p.name = load_attr->name;
373 p.prog_flags = load_attr->prog_flags;
374
375 return libbpf__bpf_prog_load(&p);
376}
377
378int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns,
379 size_t insns_cnt, const char *license,
380 __u32 kern_version, char *log_buf,
381 size_t log_buf_sz)
382{
383 struct bpf_load_program_attr load_attr;
384
385 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
386 load_attr.prog_type = type;
387 load_attr.expected_attach_type = 0;
388 load_attr.name = NULL;
389 load_attr.insns = insns;
390 load_attr.insns_cnt = insns_cnt;
391 load_attr.license = license;
392 load_attr.kern_version = kern_version;
393
394 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
395}
396
397int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns,
398 size_t insns_cnt, __u32 prog_flags, const char *license,
399 __u32 kern_version, char *log_buf, size_t log_buf_sz,
400 int log_level)
401{
402 union bpf_attr attr;
403 int fd;
404
405 memset(&attr, 0, sizeof(attr));
406 attr.prog_type = type;
407 attr.insn_cnt = (__u32)insns_cnt;
408 attr.insns = ptr_to_u64(insns);
409 attr.license = ptr_to_u64(license);
410 attr.log_buf = ptr_to_u64(log_buf);
411 attr.log_size = log_buf_sz;
412 attr.log_level = log_level;
413 log_buf[0] = 0;
414 attr.kern_version = kern_version;
415 attr.prog_flags = prog_flags;
416
417 fd = sys_bpf_prog_load(&attr, sizeof(attr));
418 return libbpf_err_errno(fd);
419}
420
421int bpf_map_update_elem(int fd, const void *key, const void *value,
422 __u64 flags)
423{
424 union bpf_attr attr;
425 int ret;
426
427 memset(&attr, 0, sizeof(attr));
428 attr.map_fd = fd;
429 attr.key = ptr_to_u64(key);
430 attr.value = ptr_to_u64(value);
431 attr.flags = flags;
432
433 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
434 return libbpf_err_errno(ret);
435}
436
437int bpf_map_lookup_elem(int fd, const void *key, void *value)
438{
439 union bpf_attr attr;
440 int ret;
441
442 memset(&attr, 0, sizeof(attr));
443 attr.map_fd = fd;
444 attr.key = ptr_to_u64(key);
445 attr.value = ptr_to_u64(value);
446
447 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
448 return libbpf_err_errno(ret);
449}
450
451int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
452{
453 union bpf_attr attr;
454 int ret;
455
456 memset(&attr, 0, sizeof(attr));
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_ELEM, &attr, sizeof(attr));
463 return libbpf_err_errno(ret);
464}
465
466int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
467{
468 union bpf_attr attr;
469 int ret;
470
471 memset(&attr, 0, sizeof(attr));
472 attr.map_fd = fd;
473 attr.key = ptr_to_u64(key);
474 attr.value = ptr_to_u64(value);
475
476 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
477 return libbpf_err_errno(ret);
478}
479
480int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags)
481{
482 union bpf_attr attr;
483
484 memset(&attr, 0, sizeof(attr));
485 attr.map_fd = fd;
486 attr.key = ptr_to_u64(key);
487 attr.value = ptr_to_u64(value);
488 attr.flags = flags;
489
490 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
491}
492
493int bpf_map_delete_elem(int fd, const void *key)
494{
495 union bpf_attr attr;
496 int ret;
497
498 memset(&attr, 0, sizeof(attr));
499 attr.map_fd = fd;
500 attr.key = ptr_to_u64(key);
501
502 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
503 return libbpf_err_errno(ret);
504}
505
506int bpf_map_get_next_key(int fd, const void *key, void *next_key)
507{
508 union bpf_attr attr;
509 int ret;
510
511 memset(&attr, 0, sizeof(attr));
512 attr.map_fd = fd;
513 attr.key = ptr_to_u64(key);
514 attr.next_key = ptr_to_u64(next_key);
515
516 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
517 return libbpf_err_errno(ret);
518}
519
520int bpf_map_freeze(int fd)
521{
522 union bpf_attr attr;
523 int ret;
524
525 memset(&attr, 0, sizeof(attr));
526 attr.map_fd = fd;
527
528 ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
529 return libbpf_err_errno(ret);
530}
531
532static int bpf_map_batch_common(int cmd, int fd, void *in_batch,
533 void *out_batch, void *keys, void *values,
534 __u32 *count,
535 const struct bpf_map_batch_opts *opts)
536{
537 union bpf_attr attr;
538 int ret;
539
540 if (!OPTS_VALID(opts, bpf_map_batch_opts))
541 return libbpf_err(-EINVAL);
542
543 memset(&attr, 0, sizeof(attr));
544 attr.batch.map_fd = fd;
545 attr.batch.in_batch = ptr_to_u64(in_batch);
546 attr.batch.out_batch = ptr_to_u64(out_batch);
547 attr.batch.keys = ptr_to_u64(keys);
548 attr.batch.values = ptr_to_u64(values);
549 attr.batch.count = *count;
550 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0);
551 attr.batch.flags = OPTS_GET(opts, flags, 0);
552
553 ret = sys_bpf(cmd, &attr, sizeof(attr));
554 *count = attr.batch.count;
555
556 return libbpf_err_errno(ret);
557}
558
559int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
560 const struct bpf_map_batch_opts *opts)
561{
562 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
563 NULL, keys, NULL, count, opts);
564}
565
566int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
567 void *values, __u32 *count,
568 const struct bpf_map_batch_opts *opts)
569{
570 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
571 out_batch, keys, values, count, opts);
572}
573
574int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
575 void *keys, void *values, __u32 *count,
576 const struct bpf_map_batch_opts *opts)
577{
578 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
579 fd, in_batch, out_batch, keys, values,
580 count, opts);
581}
582
583int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
584 const struct bpf_map_batch_opts *opts)
585{
586 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
587 keys, values, count, opts);
588}
589
590int bpf_obj_pin(int fd, const char *pathname)
591{
592 union bpf_attr attr;
593 int ret;
594
595 memset(&attr, 0, sizeof(attr));
596 attr.pathname = ptr_to_u64((void *)pathname);
597 attr.bpf_fd = fd;
598
599 ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
600 return libbpf_err_errno(ret);
601}
602
603int bpf_obj_get(const char *pathname)
604{
605 union bpf_attr attr;
606 int fd;
607
608 memset(&attr, 0, sizeof(attr));
609 attr.pathname = ptr_to_u64((void *)pathname);
610
611 fd = sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
612 return libbpf_err_errno(fd);
613}
614
615int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
616 unsigned int flags)
617{
618 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts,
619 .flags = flags,
620 );
621
622 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts);
623}
624
625int bpf_prog_attach_xattr(int prog_fd, int target_fd,
626 enum bpf_attach_type type,
627 const struct bpf_prog_attach_opts *opts)
628{
629 union bpf_attr attr;
630 int ret;
631
632 if (!OPTS_VALID(opts, bpf_prog_attach_opts))
633 return libbpf_err(-EINVAL);
634
635 memset(&attr, 0, sizeof(attr));
636 attr.target_fd = target_fd;
637 attr.attach_bpf_fd = prog_fd;
638 attr.attach_type = type;
639 attr.attach_flags = OPTS_GET(opts, flags, 0);
640 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0);
641
642 ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
643 return libbpf_err_errno(ret);
644}
645
646int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
647{
648 union bpf_attr attr;
649 int ret;
650
651 memset(&attr, 0, sizeof(attr));
652 attr.target_fd = target_fd;
653 attr.attach_type = type;
654
655 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
656 return libbpf_err_errno(ret);
657}
658
659int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
660{
661 union bpf_attr attr;
662 int ret;
663
664 memset(&attr, 0, sizeof(attr));
665 attr.target_fd = target_fd;
666 attr.attach_bpf_fd = prog_fd;
667 attr.attach_type = type;
668
669 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
670 return libbpf_err_errno(ret);
671}
672
673int bpf_link_create(int prog_fd, int target_fd,
674 enum bpf_attach_type attach_type,
675 const struct bpf_link_create_opts *opts)
676{
677 __u32 target_btf_id, iter_info_len;
678 union bpf_attr attr;
679 int fd;
680
681 if (!OPTS_VALID(opts, bpf_link_create_opts))
682 return libbpf_err(-EINVAL);
683
684 iter_info_len = OPTS_GET(opts, iter_info_len, 0);
685 target_btf_id = OPTS_GET(opts, target_btf_id, 0);
686
687 if (iter_info_len && target_btf_id)
688 return libbpf_err(-EINVAL);
689
690 memset(&attr, 0, sizeof(attr));
691 attr.link_create.prog_fd = prog_fd;
692 attr.link_create.target_fd = target_fd;
693 attr.link_create.attach_type = attach_type;
694 attr.link_create.flags = OPTS_GET(opts, flags, 0);
695
696 if (iter_info_len) {
697 attr.link_create.iter_info =
698 ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0));
699 attr.link_create.iter_info_len = iter_info_len;
700 } else if (target_btf_id) {
701 attr.link_create.target_btf_id = target_btf_id;
702 }
703
704 fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
705 return libbpf_err_errno(fd);
706}
707
708int bpf_link_detach(int link_fd)
709{
710 union bpf_attr attr;
711 int ret;
712
713 memset(&attr, 0, sizeof(attr));
714 attr.link_detach.link_fd = link_fd;
715
716 ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));
717 return libbpf_err_errno(ret);
718}
719
720int bpf_link_update(int link_fd, int new_prog_fd,
721 const struct bpf_link_update_opts *opts)
722{
723 union bpf_attr attr;
724 int ret;
725
726 if (!OPTS_VALID(opts, bpf_link_update_opts))
727 return libbpf_err(-EINVAL);
728
729 memset(&attr, 0, sizeof(attr));
730 attr.link_update.link_fd = link_fd;
731 attr.link_update.new_prog_fd = new_prog_fd;
732 attr.link_update.flags = OPTS_GET(opts, flags, 0);
733 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);
734
735 ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));
736 return libbpf_err_errno(ret);
737}
738
739int bpf_iter_create(int link_fd)
740{
741 union bpf_attr attr;
742 int fd;
743
744 memset(&attr, 0, sizeof(attr));
745 attr.iter_create.link_fd = link_fd;
746
747 fd = sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));
748 return libbpf_err_errno(fd);
749}
750
751int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
752 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
753{
754 union bpf_attr attr;
755 int ret;
756
757 memset(&attr, 0, sizeof(attr));
758 attr.query.target_fd = target_fd;
759 attr.query.attach_type = type;
760 attr.query.query_flags = query_flags;
761 attr.query.prog_cnt = *prog_cnt;
762 attr.query.prog_ids = ptr_to_u64(prog_ids);
763
764 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
765
766 if (attach_flags)
767 *attach_flags = attr.query.attach_flags;
768 *prog_cnt = attr.query.prog_cnt;
769
770 return libbpf_err_errno(ret);
771}
772
773int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
774 void *data_out, __u32 *size_out, __u32 *retval,
775 __u32 *duration)
776{
777 union bpf_attr attr;
778 int ret;
779
780 memset(&attr, 0, sizeof(attr));
781 attr.test.prog_fd = prog_fd;
782 attr.test.data_in = ptr_to_u64(data);
783 attr.test.data_out = ptr_to_u64(data_out);
784 attr.test.data_size_in = size;
785 attr.test.repeat = repeat;
786
787 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
788
789 if (size_out)
790 *size_out = attr.test.data_size_out;
791 if (retval)
792 *retval = attr.test.retval;
793 if (duration)
794 *duration = attr.test.duration;
795
796 return libbpf_err_errno(ret);
797}
798
799int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
800{
801 union bpf_attr attr;
802 int ret;
803
804 if (!test_attr->data_out && test_attr->data_size_out > 0)
805 return libbpf_err(-EINVAL);
806
807 memset(&attr, 0, sizeof(attr));
808 attr.test.prog_fd = test_attr->prog_fd;
809 attr.test.data_in = ptr_to_u64(test_attr->data_in);
810 attr.test.data_out = ptr_to_u64(test_attr->data_out);
811 attr.test.data_size_in = test_attr->data_size_in;
812 attr.test.data_size_out = test_attr->data_size_out;
813 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in);
814 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out);
815 attr.test.ctx_size_in = test_attr->ctx_size_in;
816 attr.test.ctx_size_out = test_attr->ctx_size_out;
817 attr.test.repeat = test_attr->repeat;
818
819 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
820
821 test_attr->data_size_out = attr.test.data_size_out;
822 test_attr->ctx_size_out = attr.test.ctx_size_out;
823 test_attr->retval = attr.test.retval;
824 test_attr->duration = attr.test.duration;
825
826 return libbpf_err_errno(ret);
827}
828
829int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)
830{
831 union bpf_attr attr;
832 int ret;
833
834 if (!OPTS_VALID(opts, bpf_test_run_opts))
835 return libbpf_err(-EINVAL);
836
837 memset(&attr, 0, sizeof(attr));
838 attr.test.prog_fd = prog_fd;
839 attr.test.cpu = OPTS_GET(opts, cpu, 0);
840 attr.test.flags = OPTS_GET(opts, flags, 0);
841 attr.test.repeat = OPTS_GET(opts, repeat, 0);
842 attr.test.duration = OPTS_GET(opts, duration, 0);
843 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0);
844 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0);
845 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0);
846 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0);
847 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL));
848 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL));
849 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL));
850 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));
851
852 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
853
854 OPTS_SET(opts, data_size_out, attr.test.data_size_out);
855 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);
856 OPTS_SET(opts, duration, attr.test.duration);
857 OPTS_SET(opts, retval, attr.test.retval);
858
859 return libbpf_err_errno(ret);
860}
861
862static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)
863{
864 union bpf_attr attr;
865 int err;
866
867 memset(&attr, 0, sizeof(attr));
868 attr.start_id = start_id;
869
870 err = sys_bpf(cmd, &attr, sizeof(attr));
871 if (!err)
872 *next_id = attr.next_id;
873
874 return libbpf_err_errno(err);
875}
876
877int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
878{
879 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID);
880}
881
882int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
883{
884 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);
885}
886
887int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
888{
889 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
890}
891
892int bpf_link_get_next_id(__u32 start_id, __u32 *next_id)
893{
894 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID);
895}
896
897int bpf_prog_get_fd_by_id(__u32 id)
898{
899 union bpf_attr attr;
900 int fd;
901
902 memset(&attr, 0, sizeof(attr));
903 attr.prog_id = id;
904
905 fd = sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
906 return libbpf_err_errno(fd);
907}
908
909int bpf_map_get_fd_by_id(__u32 id)
910{
911 union bpf_attr attr;
912 int fd;
913
914 memset(&attr, 0, sizeof(attr));
915 attr.map_id = id;
916
917 fd = sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
918 return libbpf_err_errno(fd);
919}
920
921int bpf_btf_get_fd_by_id(__u32 id)
922{
923 union bpf_attr attr;
924 int fd;
925
926 memset(&attr, 0, sizeof(attr));
927 attr.btf_id = id;
928
929 fd = sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
930 return libbpf_err_errno(fd);
931}
932
933int bpf_link_get_fd_by_id(__u32 id)
934{
935 union bpf_attr attr;
936 int fd;
937
938 memset(&attr, 0, sizeof(attr));
939 attr.link_id = id;
940
941 fd = sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));
942 return libbpf_err_errno(fd);
943}
944
945int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
946{
947 union bpf_attr attr;
948 int err;
949
950 memset(&attr, 0, sizeof(attr));
951 attr.info.bpf_fd = bpf_fd;
952 attr.info.info_len = *info_len;
953 attr.info.info = ptr_to_u64(info);
954
955 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
956
957 if (!err)
958 *info_len = attr.info.info_len;
959
960 return libbpf_err_errno(err);
961}
962
963int bpf_raw_tracepoint_open(const char *name, int prog_fd)
964{
965 union bpf_attr attr;
966 int fd;
967
968 memset(&attr, 0, sizeof(attr));
969 attr.raw_tracepoint.name = ptr_to_u64(name);
970 attr.raw_tracepoint.prog_fd = prog_fd;
971
972 fd = sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
973 return libbpf_err_errno(fd);
974}
975
976int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
977 bool do_log)
978{
979 union bpf_attr attr = {};
980 int fd;
981
982 attr.btf = ptr_to_u64(btf);
983 attr.btf_size = btf_size;
984
985retry:
986 if (do_log && log_buf && log_buf_size) {
987 attr.btf_log_level = 1;
988 attr.btf_log_size = log_buf_size;
989 attr.btf_log_buf = ptr_to_u64(log_buf);
990 }
991
992 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
993
994 if (fd < 0 && !do_log && log_buf && log_buf_size) {
995 do_log = true;
996 goto retry;
997 }
998
999 return libbpf_err_errno(fd);
1000}
1001
1002int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
1003 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,
1004 __u64 *probe_addr)
1005{
1006 union bpf_attr attr = {};
1007 int err;
1008
1009 attr.task_fd_query.pid = pid;
1010 attr.task_fd_query.fd = fd;
1011 attr.task_fd_query.flags = flags;
1012 attr.task_fd_query.buf = ptr_to_u64(buf);
1013 attr.task_fd_query.buf_len = *buf_len;
1014
1015 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
1016
1017 *buf_len = attr.task_fd_query.buf_len;
1018 *prog_id = attr.task_fd_query.prog_id;
1019 *fd_type = attr.task_fd_query.fd_type;
1020 *probe_offset = attr.task_fd_query.probe_offset;
1021 *probe_addr = attr.task_fd_query.probe_addr;
1022
1023 return libbpf_err_errno(err);
1024}
1025
1026int bpf_enable_stats(enum bpf_stats_type type)
1027{
1028 union bpf_attr attr;
1029 int fd;
1030
1031 memset(&attr, 0, sizeof(attr));
1032 attr.enable_stats.type = type;
1033
1034 fd = sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));
1035 return libbpf_err_errno(fd);
1036}
1037
1038int bpf_prog_bind_map(int prog_fd, int map_fd,
1039 const struct bpf_prog_bind_opts *opts)
1040{
1041 union bpf_attr attr;
1042 int ret;
1043
1044 if (!OPTS_VALID(opts, bpf_prog_bind_opts))
1045 return libbpf_err(-EINVAL);
1046
1047 memset(&attr, 0, sizeof(attr));
1048 attr.prog_bind_map.prog_fd = prog_fd;
1049 attr.prog_bind_map.map_fd = map_fd;
1050 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);
1051
1052 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));
1053 return libbpf_err_errno(ret);
1054}