summaryrefslogtreecommitdiffstats
path: root/tools/lib/bpf/bpf.c
blob: c7d7993c44bb0e1b6f7cdef1dc747050fdd0dbe9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)

/*
 * common eBPF ELF operations.
 *
 * Copyright (C) 2013-2015 Alexei Starovoitov <ast@kernel.org>
 * Copyright (C) 2015 Wang Nan <wangnan0@huawei.com>
 * Copyright (C) 2015 Huawei Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License (not later!)
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not,  see <http://www.gnu.org/licenses>
 */

#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <unistd.h>
#include <asm/unistd.h>
#include <errno.h>
#include <linux/bpf.h>
#include "bpf.h"
#include "libbpf.h"
#include "libbpf_internal.h"

/*
 * When building perf, unistd.h is overridden. __NR_bpf is
 * required to be defined explicitly.
 */
#ifndef __NR_bpf
# if defined(__i386__)
#  define __NR_bpf 357
# elif defined(__x86_64__)
#  define __NR_bpf 321
# elif defined(__aarch64__)
#  define __NR_bpf 280
# elif defined(__sparc__)
#  define __NR_bpf 349
# elif defined(__s390__)
#  define __NR_bpf 351
# elif defined(__arc__)
#  define __NR_bpf 280
# else
#  error __NR_bpf not defined. libbpf does not support your arch.
# endif
#endif

static inline __u64 ptr_to_u64(const void *ptr)
{
	return (__u64) (unsigned long) ptr;
}

static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr,
			  unsigned int size)
{
	return syscall(__NR_bpf, cmd, attr, size);
}

static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
{
	int fd;

	do {
		fd = sys_bpf(BPF_PROG_LOAD, attr, size);
	} while (fd < 0 && errno == EAGAIN);

	return fd;
}

int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr)
{
	union bpf_attr attr;

	memset(&attr, '\0', sizeof(attr));

	attr.map_type = create_attr->map_type;
	attr.key_size = create_attr->key_size;
	attr.value_size = create_attr->value_size;
	attr.max_entries = create_attr->max_entries;
	attr.map_flags = create_attr->map_flags;
	if (create_attr->name)
		memcpy(attr.map_name, create_attr->name,
		       min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1));
	attr.numa_node = create_attr->numa_node;
	attr.btf_fd = create_attr->btf_fd;
	attr.btf_key_type_id = create_attr->btf_key_type_id;
	attr.btf_value_type_id = create_attr->btf_value_type_id;
	attr.map_ifindex = create_attr->map_ifindex;
	attr.inner_map_fd = create_attr->inner_map_fd;

	return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
}

int 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)
{
	struct bpf_create_map_attr map_attr = {};

	map_attr.name = name;
	map_attr.map_type = map_type;
	map_attr.map_flags = map_flags;
	map_attr.key_size = key_size;
	map_attr.value_size = value_size;
	map_attr.max_entries = max_entries;
	if (node >= 0) {
		map_attr.numa_node = node;
		map_attr.map_flags |= BPF_F_NUMA_NODE;
	}

	return bpf_create_map_xattr(&map_attr);
}

int bpf_create_map(enum bpf_map_type map_type, int key_size,
		   int value_size, int max_entries, __u32 map_flags)
{
	struct bpf_create_map_attr map_attr = {};

	map_attr.map_type = map_type;
	map_attr.map_flags = map_flags;
	map_attr.key_size = key_size;
	map_attr.value_size = value_size;
	map_attr.max_entries = max_entries;

	return bpf_create_map_xattr(&map_attr);
}

int 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)
{
	struct bpf_create_map_attr map_attr = {};

	map_attr.name = name;
	map_attr.map_type = map_type;
	map_attr.map_flags = map_flags;
	map_attr.key_size = key_size;
	map_attr.value_size = value_size;
	map_attr.max_entries = max_entries;

	return bpf_create_map_xattr(&map_attr);
}

int 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)
{
	union bpf_attr attr;

	memset(&attr, '\0', sizeof(attr));

	attr.map_type = map_type;
	attr.key_size = key_size;
	attr.value_size = 4;
	attr.inner_map_fd = inner_map_fd;
	attr.max_entries = max_entries;
	attr.map_flags = map_flags;
	if (name)
		memcpy(attr.map_name, name,
		       min(strlen(name), BPF_OBJ_NAME_LEN - 1));

	if (node >= 0) {
		attr.map_flags |= BPF_F_NUMA_NODE;
		attr.numa_node = node;
	}

	return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr));
}

int 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)
{
	return bpf_create_map_in_map_node(map_type, name, key_size,
					  inner_map_fd, max_entries, map_flags,
					  -1);
}

static void *
alloc_zero_tailing_info(const void *orecord, __u32 cnt,
			__u32 actual_rec_size, __u32 expected_rec_size)
{
	__u64 info_len = actual_rec_size * cnt;
	void *info, *nrecord;
	int i;

	info = malloc(info_len);
	if (!info)
		return NULL;

	/* zero out bytes kernel does not understand */
	nrecord = info;
	for (i = 0; i < cnt; i++) {
		memcpy(nrecord, orecord, expected_rec_size);
		memset(nrecord + expected_rec_size, 0,
		       actual_rec_size - expected_rec_size);
		orecord += actual_rec_size;
		nrecord += actual_rec_size;
	}

	return info;
}

int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr,
			   char *log_buf, size_t log_buf_sz)
{
	void *finfo = NULL, *linfo = NULL;
	union bpf_attr attr;
	__u32 log_level;
	int fd;

	if (!load_attr || !log_buf != !log_buf_sz)
		return -EINVAL;

	log_level = load_attr->log_level;
	if (log_level > (4 | 2 | 1) || (log_level && !log_buf))
		return -EINVAL;

	memset(&attr, 0, sizeof(attr));
	attr.prog_type = load_attr->prog_type;
	attr.expected_attach_type = load_attr->expected_attach_type;
	attr.insn_cnt = (__u32)load_attr->insns_cnt;
	attr.insns = ptr_to_u64(load_attr->insns);
	attr.license = ptr_to_u64(load_attr->license);

	attr.log_level = log_level;
	if (log_level) {
		attr.log_buf = ptr_to_u64(log_buf);
		attr.log_size = log_buf_sz;
	} else {
		attr.log_buf = ptr_to_u64(NULL);
		attr.log_size = 0;
	}

	attr.kern_version = load_attr->kern_version;
	attr.prog_ifindex = load_attr->prog_ifindex;
	attr.prog_btf_fd = load_attr->prog_btf_fd;
	attr.func_info_rec_size = load_attr->func_info_rec_size;
	attr.func_info_cnt = load_attr->func_info_cnt;
	attr.func_info = ptr_to_u64(load_attr->func_info);
	attr.line_info_rec_size = load_attr->line_info_rec_size;
	attr.line_info_cnt = load_attr->line_info_cnt;
	attr.line_info = ptr_to_u64(load_attr->line_info);
	if (load_attr->name)
		memcpy(attr.prog_name, load_attr->name,
		       min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1));
	attr.prog_flags = load_attr->prog_flags;

	fd = sys_bpf_prog_load(&attr, sizeof(attr));
	if (fd >= 0)
		return fd;

	/* After bpf_prog_load, the kernel may modify certain attributes
	 * to give user space a hint how to deal with loading failure.
	 * Check to see whether we can make some changes and load again.
	 */
	while (errno == E2BIG && (!finfo || !linfo)) {
		if (!finfo && attr.func_info_cnt &&
		    attr.func_info_rec_size < load_attr->func_info_rec_size) {
			/* try with corrected func info records */
			finfo = alloc_zero_tailing_info(load_attr->func_info,
							load_attr->func_info_cnt,
							load_attr->func_info_rec_size,
							attr.func_info_rec_size);
			if (!finfo)
				goto done;

			attr.func_info = ptr_to_u64(finfo);
			attr.func_info_rec_size = load_attr->func_info_rec_size;
		} else if (!linfo && attr.line_info_cnt &&
			   attr.line_info_rec_size <
			   load_attr->line_info_rec_size) {
			linfo = alloc_zero_tailing_info(load_attr->line_info,
							load_attr->line_info_cnt,
							load_attr->line_info_rec_size,
							attr.line_info_rec_size);
			if (!linfo)
				goto done;

			attr.line_info = ptr_to_u64(linfo);
			attr.line_info_rec_size = load_attr->line_info_rec_size;
		} else {
			break;
		}

		fd = sys_bpf_prog_load(&attr, sizeof(attr));

		if (fd >= 0)
			goto done;
	}

	if (log_level || !log_buf)
		goto done;

	/* Try again with log */
	attr.log_buf = ptr_to_u64(log_buf);
	attr.log_size = log_buf_sz;
	attr.log_level = 1;
	log_buf[0] = 0;
	fd = sys_bpf_prog_load(&attr, sizeof(attr));
done:
	free(finfo);
	free(linfo);
	return fd;
}

int 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)
{
	struct bpf_load_program_attr load_attr;

	memset(&load_attr, 0, sizeof(struct bpf_load_program_attr));
	load_attr.prog_type = type;
	load_attr.expected_attach_type = 0;
	load_attr.name = NULL;
	load_attr.insns = insns;
	load_attr.insns_cnt = insns_cnt;
	load_attr.license = license;
	load_attr.kern_version = kern_version;

	return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz);
}

int 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)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.prog_type = type;
	attr.insn_cnt = (__u32)insns_cnt;
	attr.insns = ptr_to_u64(insns);
	attr.license = ptr_to_u64(license);
	attr.log_buf = ptr_to_u64(log_buf);
	attr.log_size = log_buf_sz;
	attr.log_level = log_level;
	log_buf[0] = 0;
	attr.kern_version = kern_version;
	attr.prog_flags = prog_flags;

	return sys_bpf_prog_load(&attr, sizeof(attr));
}

int bpf_map_update_elem(int fd, const void *key, const void *value,
			__u64 flags)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;
	attr.key = ptr_to_u64(key);
	attr.value = ptr_to_u64(value);
	attr.flags = flags;

	return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr));
}

int bpf_map_lookup_elem(int fd, const void *key, void *value)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;
	attr.key = ptr_to_u64(key);
	attr.value = ptr_to_u64(value);

	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
}

int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;
	attr.key = ptr_to_u64(key);
	attr.value = ptr_to_u64(value);
	attr.flags = flags;

	return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr));
}

int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;
	attr.key = ptr_to_u64(key);
	attr.value = ptr_to_u64(value);

	return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr));
}

int bpf_map_delete_elem(int fd, const void *key)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;
	attr.key = ptr_to_u64(key);

	return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr));
}

int bpf_map_get_next_key(int fd, const void *key, void *next_key)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;
	attr.key = ptr_to_u64(key);
	attr.next_key = ptr_to_u64(next_key);

	return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr));
}

int bpf_map_freeze(int fd)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_fd = fd;

	return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr));
}

int bpf_obj_pin(int fd, const char *pathname)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.pathname = ptr_to_u64((void *)pathname);
	attr.bpf_fd = fd;

	return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr));
}

int bpf_obj_get(const char *pathname)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.pathname = ptr_to_u64((void *)pathname);

	return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr));
}

int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type,
		    unsigned int flags)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.target_fd	   = target_fd;
	attr.attach_bpf_fd = prog_fd;
	attr.attach_type   = type;
	attr.attach_flags  = flags;

	return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr));
}

int bpf_prog_detach(int target_fd, enum bpf_attach_type type)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.target_fd	 = target_fd;
	attr.attach_type = type;

	return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
}

int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.target_fd	 = target_fd;
	attr.attach_bpf_fd = prog_fd;
	attr.attach_type = type;

	return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr));
}

int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags,
		   __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt)
{
	union bpf_attr attr;
	int ret;

	memset(&attr, 0, sizeof(attr));
	attr.query.target_fd	= target_fd;
	attr.query.attach_type	= type;
	attr.query.query_flags	= query_flags;
	attr.query.prog_cnt	= *prog_cnt;
	attr.query.prog_ids	= ptr_to_u64(prog_ids);

	ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr));
	if (attach_flags)
		*attach_flags = attr.query.attach_flags;
	*prog_cnt = attr.query.prog_cnt;
	return ret;
}

int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size,
		      void *data_out, __u32 *size_out, __u32 *retval,
		      __u32 *duration)
{
	union bpf_attr attr;
	int ret;

	memset(&attr, 0, sizeof(attr));
	attr.test.prog_fd = prog_fd;
	attr.test.data_in = ptr_to_u64(data);
	attr.test.data_out = ptr_to_u64(data_out);
	attr.test.data_size_in = size;
	attr.test.repeat = repeat;

	ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
	if (size_out)
		*size_out = attr.test.data_size_out;
	if (retval)
		*retval = attr.test.retval;
	if (duration)
		*duration = attr.test.duration;
	return ret;
}

int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr)
{
	union bpf_attr attr;
	int ret;

	if (!test_attr->data_out && test_attr->data_size_out > 0)
		return -EINVAL;

	memset(&attr, 0, sizeof(attr));
	attr.test.prog_fd = test_attr->prog_fd;
	attr.test.data_in = ptr_to_u64(test_attr->data_in);
	attr.test.data_out = ptr_to_u64(test_attr->data_out);
	attr.test.data_size_in = test_attr->data_size_in;
	attr.test.data_size_out = test_attr->data_size_out;
	attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in);
	attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out);
	attr.test.ctx_size_in = test_attr->ctx_size_in;
	attr.test.ctx_size_out = test_attr->ctx_size_out;
	attr.test.repeat = test_attr->repeat;

	ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr));
	test_attr->data_size_out = attr.test.data_size_out;
	test_attr->ctx_size_out = attr.test.ctx_size_out;
	test_attr->retval = attr.test.retval;
	test_attr->duration = attr.test.duration;
	return ret;
}

int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id)
{
	union bpf_attr attr;
	int err;

	memset(&attr, 0, sizeof(attr));
	attr.start_id = start_id;

	err = sys_bpf(BPF_PROG_GET_NEXT_ID, &attr, sizeof(attr));
	if (!err)
		*next_id = attr.next_id;

	return err;
}

int bpf_map_get_next_id(__u32 start_id, __u32 *next_id)
{
	union bpf_attr attr;
	int err;

	memset(&attr, 0, sizeof(attr));
	attr.start_id = start_id;

	err = sys_bpf(BPF_MAP_GET_NEXT_ID, &attr, sizeof(attr));
	if (!err)
		*next_id = attr.next_id;

	return err;
}

int bpf_prog_get_fd_by_id(__u32 id)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.prog_id = id;

	return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr));
}

int bpf_map_get_fd_by_id(__u32 id)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.map_id = id;

	return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr));
}

int bpf_btf_get_fd_by_id(__u32 id)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.btf_id = id;

	return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr));
}

int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len)
{
	union bpf_attr attr;
	int err;

	memset(&attr, 0, sizeof(attr));
	attr.info.bpf_fd = prog_fd;
	attr.info.info_len = *info_len;
	attr.info.info = ptr_to_u64(info);

	err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr));
	if (!err)
		*info_len = attr.info.info_len;

	return err;
}

int bpf_raw_tracepoint_open(const char *name, int prog_fd)
{
	union bpf_attr attr;

	memset(&attr, 0, sizeof(attr));
	attr.raw_tracepoint.name = ptr_to_u64(name);
	attr.raw_tracepoint.prog_fd = prog_fd;

	return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr));
}

int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size,
		 bool do_log)
{
	union bpf_attr attr = {};
	int fd;

	attr.btf = ptr_to_u64(btf);
	attr.btf_size = btf_size;

retry:
	if (do_log && log_buf && log_buf_size) {
		attr.btf_log_level = 1;
		attr.btf_log_size = log_buf_size;
		attr.btf_log_buf = ptr_to_u64(log_buf);
	}

	fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr));
	if (fd == -1 && !do_log && log_buf && log_buf_size) {
		do_log = true;
		goto retry;
	}

	return fd;
}

int 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)
{
	union bpf_attr attr = {};
	int err;

	attr.task_fd_query.pid = pid;
	attr.task_fd_query.fd = fd;
	attr.task_fd_query.flags = flags;
	attr.task_fd_query.buf = ptr_to_u64(buf);
	attr.task_fd_query.buf_len = *buf_len;

	err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr));
	*buf_len = attr.task_fd_query.buf_len;
	*prog_id = attr.task_fd_query.prog_id;
	*fd_type = attr.task_fd_query.fd_type;
	*probe_offset = attr.task_fd_query.probe_offset;
	*probe_addr = attr.task_fd_query.probe_addr;

	return err;
}