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
ptr_to_u64(const void * ptr)57 static inline __u64 ptr_to_u64(const void *ptr)
58 {
59 return (__u64) (unsigned long) ptr;
60 }
61
sys_bpf(enum bpf_cmd cmd,union bpf_attr * attr,unsigned int size)62 static 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
sys_bpf_prog_load(union bpf_attr * attr,unsigned int size)68 static 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
bpf_create_map_xattr(const struct bpf_create_map_attr * create_attr)80 int 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
bpf_create_map_node(enum bpf_map_type map_type,const char * name,int key_size,int value_size,int max_entries,__u32 map_flags,int node)110 int 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
bpf_create_map(enum bpf_map_type map_type,int key_size,int value_size,int max_entries,__u32 map_flags)130 int 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
bpf_create_map_name(enum bpf_map_type map_type,const char * name,int key_size,int value_size,int max_entries,__u32 map_flags)144 int 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
bpf_create_map_in_map_node(enum bpf_map_type map_type,const char * name,int key_size,int inner_map_fd,int max_entries,__u32 map_flags,int node)160 int 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
bpf_create_map_in_map(enum bpf_map_type map_type,const char * name,int key_size,int inner_map_fd,int max_entries,__u32 map_flags)188 int 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
197 static void *
alloc_zero_tailing_info(const void * orecord,__u32 cnt,__u32 actual_rec_size,__u32 expected_rec_size)198 alloc_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
libbpf__bpf_prog_load(const struct bpf_prog_load_params * load_attr)222 int 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));
328 done:
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
bpf_load_program_xattr(const struct bpf_load_program_attr * load_attr,char * log_buf,size_t log_buf_sz)335 int 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
bpf_load_program(enum bpf_prog_type type,const struct bpf_insn * insns,size_t insns_cnt,const char * license,__u32 kern_version,char * log_buf,size_t log_buf_sz)378 int 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
bpf_verify_program(enum bpf_prog_type type,const struct bpf_insn * insns,size_t insns_cnt,__u32 prog_flags,const char * license,__u32 kern_version,char * log_buf,size_t log_buf_sz,int log_level)397 int 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
bpf_map_update_elem(int fd,const void * key,const void * value,__u64 flags)421 int 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
bpf_map_lookup_elem(int fd,const void * key,void * value)437 int 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
bpf_map_lookup_elem_flags(int fd,const void * key,void * value,__u64 flags)451 int 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
bpf_map_lookup_and_delete_elem(int fd,const void * key,void * value)466 int 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
bpf_map_lookup_and_delete_elem_flags(int fd,const void * key,void * value,__u64 flags)480 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags)
481 {
482 union bpf_attr attr;
483 int ret;
484
485 memset(&attr, 0, sizeof(attr));
486 attr.map_fd = fd;
487 attr.key = ptr_to_u64(key);
488 attr.value = ptr_to_u64(value);
489 attr.flags = flags;
490
491 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
492 return libbpf_err_errno(ret);
493 }
494
bpf_map_delete_elem(int fd,const void * key)495 int bpf_map_delete_elem(int fd, const void *key)
496 {
497 union bpf_attr attr;
498 int ret;
499
500 memset(&attr, 0, sizeof(attr));
501 attr.map_fd = fd;
502 attr.key = ptr_to_u64(key);
503
504 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
505 return libbpf_err_errno(ret);
506 }
507
bpf_map_get_next_key(int fd,const void * key,void * next_key)508 int bpf_map_get_next_key(int fd, const void *key, void *next_key)
509 {
510 union bpf_attr attr;
511 int ret;
512
513 memset(&attr, 0, sizeof(attr));
514 attr.map_fd = fd;
515 attr.key = ptr_to_u64(key);
516 attr.next_key = ptr_to_u64(next_key);
517
518 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
519 return libbpf_err_errno(ret);
520 }
521
bpf_map_freeze(int fd)522 int bpf_map_freeze(int fd)
523 {
524 union bpf_attr attr;
525 int ret;
526
527 memset(&attr, 0, sizeof(attr));
528 attr.map_fd = fd;
529
530 ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
531 return libbpf_err_errno(ret);
532 }
533
bpf_map_batch_common(int cmd,int fd,void * in_batch,void * out_batch,void * keys,void * values,__u32 * count,const struct bpf_map_batch_opts * opts)534 static int bpf_map_batch_common(int cmd, int fd, void *in_batch,
535 void *out_batch, void *keys, void *values,
536 __u32 *count,
537 const struct bpf_map_batch_opts *opts)
538 {
539 union bpf_attr attr;
540 int ret;
541
542 if (!OPTS_VALID(opts, bpf_map_batch_opts))
543 return libbpf_err(-EINVAL);
544
545 memset(&attr, 0, sizeof(attr));
546 attr.batch.map_fd = fd;
547 attr.batch.in_batch = ptr_to_u64(in_batch);
548 attr.batch.out_batch = ptr_to_u64(out_batch);
549 attr.batch.keys = ptr_to_u64(keys);
550 attr.batch.values = ptr_to_u64(values);
551 attr.batch.count = *count;
552 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0);
553 attr.batch.flags = OPTS_GET(opts, flags, 0);
554
555 ret = sys_bpf(cmd, &attr, sizeof(attr));
556 *count = attr.batch.count;
557
558 return libbpf_err_errno(ret);
559 }
560
bpf_map_delete_batch(int fd,void * keys,__u32 * count,const struct bpf_map_batch_opts * opts)561 int bpf_map_delete_batch(int fd, void *keys, __u32 *count,
562 const struct bpf_map_batch_opts *opts)
563 {
564 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL,
565 NULL, keys, NULL, count, opts);
566 }
567
bpf_map_lookup_batch(int fd,void * in_batch,void * out_batch,void * keys,void * values,__u32 * count,const struct bpf_map_batch_opts * opts)568 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys,
569 void *values, __u32 *count,
570 const struct bpf_map_batch_opts *opts)
571 {
572 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch,
573 out_batch, keys, values, count, opts);
574 }
575
bpf_map_lookup_and_delete_batch(int fd,void * in_batch,void * out_batch,void * keys,void * values,__u32 * count,const struct bpf_map_batch_opts * opts)576 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch,
577 void *keys, void *values, __u32 *count,
578 const struct bpf_map_batch_opts *opts)
579 {
580 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH,
581 fd, in_batch, out_batch, keys, values,
582 count, opts);
583 }
584
bpf_map_update_batch(int fd,void * keys,void * values,__u32 * count,const struct bpf_map_batch_opts * opts)585 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count,
586 const struct bpf_map_batch_opts *opts)
587 {
588 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL,
589 keys, values, count, opts);
590 }
591
bpf_obj_pin(int fd,const char * pathname)592 int bpf_obj_pin(int fd, const char *pathname)
593 {
594 union bpf_attr attr;
595 int ret;
596
597 memset(&attr, 0, sizeof(attr));
598 attr.pathname = ptr_to_u64((void *)pathname);
599 attr.bpf_fd = fd;
600
601 ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
602 return libbpf_err_errno(ret);
603 }
604
bpf_obj_get(const char * pathname)605 int bpf_obj_get(const char *pathname)
606 {
607 union bpf_attr attr;
608 int fd;
609
610 memset(&attr, 0, sizeof(attr));
611 attr.pathname = ptr_to_u64((void *)pathname);
612
613 fd = sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
614 return libbpf_err_errno(fd);
615 }
616
bpf_prog_attach(int prog_fd,int target_fd,enum bpf_attach_type type,unsigned int flags)617 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
618 unsigned int flags)
619 {
620 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts,
621 .flags = flags,
622 );
623
624 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts);
625 }
626
bpf_prog_attach_xattr(int prog_fd,int target_fd,enum bpf_attach_type type,const struct bpf_prog_attach_opts * opts)627 int bpf_prog_attach_xattr(int prog_fd, int target_fd,
628 enum bpf_attach_type type,
629 const struct bpf_prog_attach_opts *opts)
630 {
631 union bpf_attr attr;
632 int ret;
633
634 if (!OPTS_VALID(opts, bpf_prog_attach_opts))
635 return libbpf_err(-EINVAL);
636
637 memset(&attr, 0, sizeof(attr));
638 attr.target_fd = target_fd;
639 attr.attach_bpf_fd = prog_fd;
640 attr.attach_type = type;
641 attr.attach_flags = OPTS_GET(opts, flags, 0);
642 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0);
643
644 ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
645 return libbpf_err_errno(ret);
646 }
647
bpf_prog_detach(int target_fd,enum bpf_attach_type type)648 int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
649 {
650 union bpf_attr attr;
651 int ret;
652
653 memset(&attr, 0, sizeof(attr));
654 attr.target_fd = target_fd;
655 attr.attach_type = type;
656
657 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
658 return libbpf_err_errno(ret);
659 }
660
bpf_prog_detach2(int prog_fd,int target_fd,enum bpf_attach_type type)661 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
662 {
663 union bpf_attr attr;
664 int ret;
665
666 memset(&attr, 0, sizeof(attr));
667 attr.target_fd = target_fd;
668 attr.attach_bpf_fd = prog_fd;
669 attr.attach_type = type;
670
671 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
672 return libbpf_err_errno(ret);
673 }
674
bpf_link_create(int prog_fd,int target_fd,enum bpf_attach_type attach_type,const struct bpf_link_create_opts * opts)675 int bpf_link_create(int prog_fd, int target_fd,
676 enum bpf_attach_type attach_type,
677 const struct bpf_link_create_opts *opts)
678 {
679 __u32 target_btf_id, iter_info_len;
680 union bpf_attr attr;
681 int fd;
682
683 if (!OPTS_VALID(opts, bpf_link_create_opts))
684 return libbpf_err(-EINVAL);
685
686 iter_info_len = OPTS_GET(opts, iter_info_len, 0);
687 target_btf_id = OPTS_GET(opts, target_btf_id, 0);
688
689 /* validate we don't have unexpected combinations of non-zero fields */
690 if (iter_info_len || target_btf_id) {
691 if (iter_info_len && target_btf_id)
692 return libbpf_err(-EINVAL);
693 if (!OPTS_ZEROED(opts, target_btf_id))
694 return libbpf_err(-EINVAL);
695 }
696
697 memset(&attr, 0, sizeof(attr));
698 attr.link_create.prog_fd = prog_fd;
699 attr.link_create.target_fd = target_fd;
700 attr.link_create.attach_type = attach_type;
701 attr.link_create.flags = OPTS_GET(opts, flags, 0);
702
703 if (target_btf_id) {
704 attr.link_create.target_btf_id = target_btf_id;
705 goto proceed;
706 }
707
708 switch (attach_type) {
709 case BPF_TRACE_ITER:
710 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0));
711 attr.link_create.iter_info_len = iter_info_len;
712 break;
713 case BPF_PERF_EVENT:
714 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0);
715 if (!OPTS_ZEROED(opts, perf_event))
716 return libbpf_err(-EINVAL);
717 break;
718 default:
719 if (!OPTS_ZEROED(opts, flags))
720 return libbpf_err(-EINVAL);
721 break;
722 }
723 proceed:
724 fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr));
725 return libbpf_err_errno(fd);
726 }
727
bpf_link_detach(int link_fd)728 int bpf_link_detach(int link_fd)
729 {
730 union bpf_attr attr;
731 int ret;
732
733 memset(&attr, 0, sizeof(attr));
734 attr.link_detach.link_fd = link_fd;
735
736 ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr));
737 return libbpf_err_errno(ret);
738 }
739
bpf_link_update(int link_fd,int new_prog_fd,const struct bpf_link_update_opts * opts)740 int bpf_link_update(int link_fd, int new_prog_fd,
741 const struct bpf_link_update_opts *opts)
742 {
743 union bpf_attr attr;
744 int ret;
745
746 if (!OPTS_VALID(opts, bpf_link_update_opts))
747 return libbpf_err(-EINVAL);
748
749 memset(&attr, 0, sizeof(attr));
750 attr.link_update.link_fd = link_fd;
751 attr.link_update.new_prog_fd = new_prog_fd;
752 attr.link_update.flags = OPTS_GET(opts, flags, 0);
753 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0);
754
755 ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr));
756 return libbpf_err_errno(ret);
757 }
758
bpf_iter_create(int link_fd)759 int bpf_iter_create(int link_fd)
760 {
761 union bpf_attr attr;
762 int fd;
763
764 memset(&attr, 0, sizeof(attr));
765 attr.iter_create.link_fd = link_fd;
766
767 fd = sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr));
768 return libbpf_err_errno(fd);
769 }
770
bpf_prog_query(int target_fd,enum bpf_attach_type type,__u32 query_flags,__u32 * attach_flags,__u32 * prog_ids,__u32 * prog_cnt)771 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
772 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
773 {
774 union bpf_attr attr;
775 int ret;
776
777 memset(&attr, 0, sizeof(attr));
778 attr.query.target_fd = target_fd;
779 attr.query.attach_type = type;
780 attr.query.query_flags = query_flags;
781 attr.query.prog_cnt = *prog_cnt;
782 attr.query.prog_ids = ptr_to_u64(prog_ids);
783
784 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
785
786 if (attach_flags)
787 *attach_flags = attr.query.attach_flags;
788 *prog_cnt = attr.query.prog_cnt;
789
790 return libbpf_err_errno(ret);
791 }
792
bpf_prog_test_run(int prog_fd,int repeat,void * data,__u32 size,void * data_out,__u32 * size_out,__u32 * retval,__u32 * duration)793 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
794 void *data_out, __u32 *size_out, __u32 *retval,
795 __u32 *duration)
796 {
797 union bpf_attr attr;
798 int ret;
799
800 memset(&attr, 0, sizeof(attr));
801 attr.test.prog_fd = prog_fd;
802 attr.test.data_in = ptr_to_u64(data);
803 attr.test.data_out = ptr_to_u64(data_out);
804 attr.test.data_size_in = size;
805 attr.test.repeat = repeat;
806
807 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
808
809 if (size_out)
810 *size_out = attr.test.data_size_out;
811 if (retval)
812 *retval = attr.test.retval;
813 if (duration)
814 *duration = attr.test.duration;
815
816 return libbpf_err_errno(ret);
817 }
818
bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr * test_attr)819 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
820 {
821 union bpf_attr attr;
822 int ret;
823
824 if (!test_attr->data_out && test_attr->data_size_out > 0)
825 return libbpf_err(-EINVAL);
826
827 memset(&attr, 0, sizeof(attr));
828 attr.test.prog_fd = test_attr->prog_fd;
829 attr.test.data_in = ptr_to_u64(test_attr->data_in);
830 attr.test.data_out = ptr_to_u64(test_attr->data_out);
831 attr.test.data_size_in = test_attr->data_size_in;
832 attr.test.data_size_out = test_attr->data_size_out;
833 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in);
834 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out);
835 attr.test.ctx_size_in = test_attr->ctx_size_in;
836 attr.test.ctx_size_out = test_attr->ctx_size_out;
837 attr.test.repeat = test_attr->repeat;
838
839 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
840
841 test_attr->data_size_out = attr.test.data_size_out;
842 test_attr->ctx_size_out = attr.test.ctx_size_out;
843 test_attr->retval = attr.test.retval;
844 test_attr->duration = attr.test.duration;
845
846 return libbpf_err_errno(ret);
847 }
848
bpf_prog_test_run_opts(int prog_fd,struct bpf_test_run_opts * opts)849 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts)
850 {
851 union bpf_attr attr;
852 int ret;
853
854 if (!OPTS_VALID(opts, bpf_test_run_opts))
855 return libbpf_err(-EINVAL);
856
857 memset(&attr, 0, sizeof(attr));
858 attr.test.prog_fd = prog_fd;
859 attr.test.cpu = OPTS_GET(opts, cpu, 0);
860 attr.test.flags = OPTS_GET(opts, flags, 0);
861 attr.test.repeat = OPTS_GET(opts, repeat, 0);
862 attr.test.duration = OPTS_GET(opts, duration, 0);
863 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0);
864 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0);
865 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0);
866 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0);
867 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL));
868 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL));
869 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL));
870 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL));
871
872 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
873
874 OPTS_SET(opts, data_size_out, attr.test.data_size_out);
875 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out);
876 OPTS_SET(opts, duration, attr.test.duration);
877 OPTS_SET(opts, retval, attr.test.retval);
878
879 return libbpf_err_errno(ret);
880 }
881
bpf_obj_get_next_id(__u32 start_id,__u32 * next_id,int cmd)882 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd)
883 {
884 union bpf_attr attr;
885 int err;
886
887 memset(&attr, 0, sizeof(attr));
888 attr.start_id = start_id;
889
890 err = sys_bpf(cmd, &attr, sizeof(attr));
891 if (!err)
892 *next_id = attr.next_id;
893
894 return libbpf_err_errno(err);
895 }
896
bpf_prog_get_next_id(__u32 start_id,__u32 * next_id)897 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
898 {
899 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID);
900 }
901
bpf_map_get_next_id(__u32 start_id,__u32 * next_id)902 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
903 {
904 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID);
905 }
906
bpf_btf_get_next_id(__u32 start_id,__u32 * next_id)907 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id)
908 {
909 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID);
910 }
911
bpf_link_get_next_id(__u32 start_id,__u32 * next_id)912 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id)
913 {
914 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID);
915 }
916
bpf_prog_get_fd_by_id(__u32 id)917 int bpf_prog_get_fd_by_id(__u32 id)
918 {
919 union bpf_attr attr;
920 int fd;
921
922 memset(&attr, 0, sizeof(attr));
923 attr.prog_id = id;
924
925 fd = sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
926 return libbpf_err_errno(fd);
927 }
928
bpf_map_get_fd_by_id(__u32 id)929 int bpf_map_get_fd_by_id(__u32 id)
930 {
931 union bpf_attr attr;
932 int fd;
933
934 memset(&attr, 0, sizeof(attr));
935 attr.map_id = id;
936
937 fd = sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
938 return libbpf_err_errno(fd);
939 }
940
bpf_btf_get_fd_by_id(__u32 id)941 int bpf_btf_get_fd_by_id(__u32 id)
942 {
943 union bpf_attr attr;
944 int fd;
945
946 memset(&attr, 0, sizeof(attr));
947 attr.btf_id = id;
948
949 fd = sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
950 return libbpf_err_errno(fd);
951 }
952
bpf_link_get_fd_by_id(__u32 id)953 int bpf_link_get_fd_by_id(__u32 id)
954 {
955 union bpf_attr attr;
956 int fd;
957
958 memset(&attr, 0, sizeof(attr));
959 attr.link_id = id;
960
961 fd = sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr));
962 return libbpf_err_errno(fd);
963 }
964
bpf_obj_get_info_by_fd(int bpf_fd,void * info,__u32 * info_len)965 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len)
966 {
967 union bpf_attr attr;
968 int err;
969
970 memset(&attr, 0, sizeof(attr));
971 attr.info.bpf_fd = bpf_fd;
972 attr.info.info_len = *info_len;
973 attr.info.info = ptr_to_u64(info);
974
975 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
976
977 if (!err)
978 *info_len = attr.info.info_len;
979
980 return libbpf_err_errno(err);
981 }
982
bpf_raw_tracepoint_open(const char * name,int prog_fd)983 int bpf_raw_tracepoint_open(const char *name, int prog_fd)
984 {
985 union bpf_attr attr;
986 int fd;
987
988 memset(&attr, 0, sizeof(attr));
989 attr.raw_tracepoint.name = ptr_to_u64(name);
990 attr.raw_tracepoint.prog_fd = prog_fd;
991
992 fd = sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
993 return libbpf_err_errno(fd);
994 }
995
bpf_load_btf(const void * btf,__u32 btf_size,char * log_buf,__u32 log_buf_size,bool do_log)996 int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
997 bool do_log)
998 {
999 union bpf_attr attr = {};
1000 int fd;
1001
1002 attr.btf = ptr_to_u64(btf);
1003 attr.btf_size = btf_size;
1004
1005 retry:
1006 if (do_log && log_buf && log_buf_size) {
1007 attr.btf_log_level = 1;
1008 attr.btf_log_size = log_buf_size;
1009 attr.btf_log_buf = ptr_to_u64(log_buf);
1010 }
1011
1012 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
1013
1014 if (fd < 0 && !do_log && log_buf && log_buf_size) {
1015 do_log = true;
1016 goto retry;
1017 }
1018
1019 return libbpf_err_errno(fd);
1020 }
1021
bpf_task_fd_query(int pid,int fd,__u32 flags,char * buf,__u32 * buf_len,__u32 * prog_id,__u32 * fd_type,__u64 * probe_offset,__u64 * probe_addr)1022 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len,
1023 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset,
1024 __u64 *probe_addr)
1025 {
1026 union bpf_attr attr = {};
1027 int err;
1028
1029 attr.task_fd_query.pid = pid;
1030 attr.task_fd_query.fd = fd;
1031 attr.task_fd_query.flags = flags;
1032 attr.task_fd_query.buf = ptr_to_u64(buf);
1033 attr.task_fd_query.buf_len = *buf_len;
1034
1035 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
1036
1037 *buf_len = attr.task_fd_query.buf_len;
1038 *prog_id = attr.task_fd_query.prog_id;
1039 *fd_type = attr.task_fd_query.fd_type;
1040 *probe_offset = attr.task_fd_query.probe_offset;
1041 *probe_addr = attr.task_fd_query.probe_addr;
1042
1043 return libbpf_err_errno(err);
1044 }
1045
bpf_enable_stats(enum bpf_stats_type type)1046 int bpf_enable_stats(enum bpf_stats_type type)
1047 {
1048 union bpf_attr attr;
1049 int fd;
1050
1051 memset(&attr, 0, sizeof(attr));
1052 attr.enable_stats.type = type;
1053
1054 fd = sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr));
1055 return libbpf_err_errno(fd);
1056 }
1057
bpf_prog_bind_map(int prog_fd,int map_fd,const struct bpf_prog_bind_opts * opts)1058 int bpf_prog_bind_map(int prog_fd, int map_fd,
1059 const struct bpf_prog_bind_opts *opts)
1060 {
1061 union bpf_attr attr;
1062 int ret;
1063
1064 if (!OPTS_VALID(opts, bpf_prog_bind_opts))
1065 return libbpf_err(-EINVAL);
1066
1067 memset(&attr, 0, sizeof(attr));
1068 attr.prog_bind_map.prog_fd = prog_fd;
1069 attr.prog_bind_map.map_fd = map_fd;
1070 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0);
1071
1072 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr));
1073 return libbpf_err_errno(ret);
1074 }
1075