root/tools/lib/bpf/bpf.c

DEFINITIONS

1. ptr_to_u64
2. sys_bpf
3. sys_bpf_prog_load
4. bpf_create_map_xattr
5. bpf_create_map_node
6. bpf_create_map
7. bpf_create_map_name
8. bpf_create_map_in_map_node
9. bpf_create_map_in_map
10. alloc_zero_tailing_info
11. bpf_load_program_xattr
12. bpf_load_program
13. bpf_verify_program
14. bpf_map_update_elem
15. bpf_map_lookup_elem
16. bpf_map_lookup_elem_flags
17. bpf_map_lookup_and_delete_elem
18. bpf_map_delete_elem
19. bpf_map_get_next_key
20. bpf_map_freeze
21. bpf_obj_pin
22. bpf_obj_get
23. bpf_prog_attach
24. bpf_prog_detach
25. bpf_prog_detach2
26. bpf_prog_query
27. bpf_prog_test_run
28. bpf_prog_test_run_xattr
29. bpf_obj_get_next_id
30. bpf_prog_get_next_id
31. bpf_map_get_next_id
32. bpf_btf_get_next_id
33. bpf_prog_get_fd_by_id
34. bpf_map_get_fd_by_id
35. bpf_btf_get_fd_by_id
36. bpf_obj_get_info_by_fd
37. bpf_raw_tracepoint_open
38. bpf_load_btf
39. bpf_task_fd_query

   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 
  57 static inline __u64 ptr_to_u64(const void *ptr)
  58 {
  59         return (__u64) (unsigned long) ptr;
  60 }
  61 
  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 
  68 static 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 
  79 int 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 
 103 int 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 
 123 int 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 
 137 int 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 
 153 int 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 
 179 int 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 
 188 static void *
 189 alloc_zero_tailing_info(const void *orecord, __u32 cnt,
 190                         __u32 actual_rec_size, __u32 expected_rec_size)
 191 {
 192         __u64 info_len = (__u64)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 
 213 int 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));
 310 done:
 311         free(finfo);
 312         free(linfo);
 313         return fd;
 314 }
 315 
 316 int 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 
 335 int 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 
 357 int 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 
 371 int 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 
 383 int 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 
 396 int 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 
 408 int 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 
 419 int 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 
 431 int 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 
 441 int 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 
 452 int 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 
 462 int 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 
 476 int 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 
 487 int 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 
 499 int 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 
 519 int 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 
 543 int 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 
 571 static 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 
 586 int 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 
 591 int 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 
 596 int 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 
 601 int 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 
 611 int 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 
 621 int 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 
 631 int 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 
 648 int 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 
 659 int 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 
 668 retry:
 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 
 684 int 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 }