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 /* make sure libbpf doesn't use kernel-only integer typedefs */ 36 #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 37 38 /* 39 * When building perf, unistd.h is overridden. __NR_bpf is 40 * required to be defined explicitly. 41 */ 42 #ifndef __NR_bpf 43 # if defined(__i386__) 44 # define __NR_bpf 357 45 # elif defined(__x86_64__) 46 # define __NR_bpf 321 47 # elif defined(__aarch64__) 48 # define __NR_bpf 280 49 # elif defined(__sparc__) 50 # define __NR_bpf 349 51 # elif defined(__s390__) 52 # define __NR_bpf 351 53 # elif defined(__arc__) 54 # define __NR_bpf 280 55 # else 56 # error __NR_bpf not defined. libbpf does not support your arch. 57 # endif 58 #endif 59 60 static inline __u64 ptr_to_u64(const void *ptr) 61 { 62 return (__u64) (unsigned long) ptr; 63 } 64 65 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, 66 unsigned int size) 67 { 68 return syscall(__NR_bpf, cmd, attr, size); 69 } 70 71 static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size) 72 { 73 int fd; 74 75 do { 76 fd = sys_bpf(BPF_PROG_LOAD, attr, size); 77 } while (fd < 0 && errno == EAGAIN); 78 79 return fd; 80 } 81 82 int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) 83 { 84 union bpf_attr attr; 85 86 memset(&attr, '\0', sizeof(attr)); 87 88 attr.map_type = create_attr->map_type; 89 attr.key_size = create_attr->key_size; 90 attr.value_size = create_attr->value_size; 91 attr.max_entries = create_attr->max_entries; 92 attr.map_flags = create_attr->map_flags; 93 if (create_attr->name) 94 memcpy(attr.map_name, create_attr->name, 95 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1)); 96 attr.numa_node = create_attr->numa_node; 97 attr.btf_fd = create_attr->btf_fd; 98 attr.btf_key_type_id = create_attr->btf_key_type_id; 99 attr.btf_value_type_id = create_attr->btf_value_type_id; 100 attr.map_ifindex = create_attr->map_ifindex; 101 if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS) 102 attr.btf_vmlinux_value_type_id = 103 create_attr->btf_vmlinux_value_type_id; 104 else 105 attr.inner_map_fd = create_attr->inner_map_fd; 106 107 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 108 } 109 110 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 } 129 130 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 } 143 144 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 } 159 160 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; 165 166 memset(&attr, '\0', sizeof(attr)); 167 168 attr.map_type = map_type; 169 attr.key_size = key_size; 170 attr.value_size = 4; 171 attr.inner_map_fd = inner_map_fd; 172 attr.max_entries = max_entries; 173 attr.map_flags = map_flags; 174 if (name) 175 memcpy(attr.map_name, name, 176 min(strlen(name), BPF_OBJ_NAME_LEN - 1)); 177 178 if (node >= 0) { 179 attr.map_flags |= BPF_F_NUMA_NODE; 180 attr.numa_node = node; 181 } 182 183 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 184 } 185 186 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, 187 int key_size, int inner_map_fd, int max_entries, 188 __u32 map_flags) 189 { 190 return bpf_create_map_in_map_node(map_type, name, key_size, 191 inner_map_fd, max_entries, map_flags, 192 -1); 193 } 194 195 static void * 196 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 197 __u32 actual_rec_size, __u32 expected_rec_size) 198 { 199 __u64 info_len = (__u64)actual_rec_size * cnt; 200 void *info, *nrecord; 201 int i; 202 203 info = malloc(info_len); 204 if (!info) 205 return NULL; 206 207 /* zero out bytes kernel does not understand */ 208 nrecord = info; 209 for (i = 0; i < cnt; i++) { 210 memcpy(nrecord, orecord, expected_rec_size); 211 memset(nrecord + expected_rec_size, 0, 212 actual_rec_size - expected_rec_size); 213 orecord += actual_rec_size; 214 nrecord += actual_rec_size; 215 } 216 217 return info; 218 } 219 220 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 221 char *log_buf, size_t log_buf_sz) 222 { 223 void *finfo = NULL, *linfo = NULL; 224 union bpf_attr attr; 225 __u32 log_level; 226 int fd; 227 228 if (!load_attr || !log_buf != !log_buf_sz) 229 return -EINVAL; 230 231 log_level = load_attr->log_level; 232 if (log_level > (4 | 2 | 1) || (log_level && !log_buf)) 233 return -EINVAL; 234 235 memset(&attr, 0, sizeof(attr)); 236 attr.prog_type = load_attr->prog_type; 237 attr.expected_attach_type = load_attr->expected_attach_type; 238 if (attr.prog_type == BPF_PROG_TYPE_STRUCT_OPS) { 239 attr.attach_btf_id = load_attr->attach_btf_id; 240 } else if (attr.prog_type == BPF_PROG_TYPE_TRACING) { 241 attr.attach_btf_id = load_attr->attach_btf_id; 242 attr.attach_prog_fd = load_attr->attach_prog_fd; 243 } else { 244 attr.prog_ifindex = load_attr->prog_ifindex; 245 attr.kern_version = load_attr->kern_version; 246 } 247 attr.insn_cnt = (__u32)load_attr->insns_cnt; 248 attr.insns = ptr_to_u64(load_attr->insns); 249 attr.license = ptr_to_u64(load_attr->license); 250 251 attr.log_level = log_level; 252 if (log_level) { 253 attr.log_buf = ptr_to_u64(log_buf); 254 attr.log_size = log_buf_sz; 255 } else { 256 attr.log_buf = ptr_to_u64(NULL); 257 attr.log_size = 0; 258 } 259 260 attr.prog_btf_fd = load_attr->prog_btf_fd; 261 attr.func_info_rec_size = load_attr->func_info_rec_size; 262 attr.func_info_cnt = load_attr->func_info_cnt; 263 attr.func_info = ptr_to_u64(load_attr->func_info); 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 if (load_attr->name) 268 memcpy(attr.prog_name, load_attr->name, 269 min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1)); 270 attr.prog_flags = load_attr->prog_flags; 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 goto done; 290 291 attr.func_info = ptr_to_u64(finfo); 292 attr.func_info_rec_size = load_attr->func_info_rec_size; 293 } else if (!linfo && attr.line_info_cnt && 294 attr.line_info_rec_size < 295 load_attr->line_info_rec_size) { 296 linfo = alloc_zero_tailing_info(load_attr->line_info, 297 load_attr->line_info_cnt, 298 load_attr->line_info_rec_size, 299 attr.line_info_rec_size); 300 if (!linfo) 301 goto done; 302 303 attr.line_info = ptr_to_u64(linfo); 304 attr.line_info_rec_size = load_attr->line_info_rec_size; 305 } else { 306 break; 307 } 308 309 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 310 311 if (fd >= 0) 312 goto done; 313 } 314 315 if (log_level || !log_buf) 316 goto done; 317 318 /* Try again with log */ 319 attr.log_buf = ptr_to_u64(log_buf); 320 attr.log_size = log_buf_sz; 321 attr.log_level = 1; 322 log_buf[0] = 0; 323 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 324 done: 325 free(finfo); 326 free(linfo); 327 return fd; 328 } 329 330 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 331 size_t insns_cnt, const char *license, 332 __u32 kern_version, char *log_buf, 333 size_t log_buf_sz) 334 { 335 struct bpf_load_program_attr load_attr; 336 337 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 338 load_attr.prog_type = type; 339 load_attr.expected_attach_type = 0; 340 load_attr.name = NULL; 341 load_attr.insns = insns; 342 load_attr.insns_cnt = insns_cnt; 343 load_attr.license = license; 344 load_attr.kern_version = kern_version; 345 346 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 347 } 348 349 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 350 size_t insns_cnt, __u32 prog_flags, const char *license, 351 __u32 kern_version, char *log_buf, size_t log_buf_sz, 352 int log_level) 353 { 354 union bpf_attr attr; 355 356 memset(&attr, 0, sizeof(attr)); 357 attr.prog_type = type; 358 attr.insn_cnt = (__u32)insns_cnt; 359 attr.insns = ptr_to_u64(insns); 360 attr.license = ptr_to_u64(license); 361 attr.log_buf = ptr_to_u64(log_buf); 362 attr.log_size = log_buf_sz; 363 attr.log_level = log_level; 364 log_buf[0] = 0; 365 attr.kern_version = kern_version; 366 attr.prog_flags = prog_flags; 367 368 return sys_bpf_prog_load(&attr, sizeof(attr)); 369 } 370 371 int bpf_map_update_elem(int fd, const void *key, const void *value, 372 __u64 flags) 373 { 374 union bpf_attr attr; 375 376 memset(&attr, 0, sizeof(attr)); 377 attr.map_fd = fd; 378 attr.key = ptr_to_u64(key); 379 attr.value = ptr_to_u64(value); 380 attr.flags = flags; 381 382 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 383 } 384 385 int bpf_map_lookup_elem(int fd, const void *key, void *value) 386 { 387 union bpf_attr attr; 388 389 memset(&attr, 0, sizeof(attr)); 390 attr.map_fd = fd; 391 attr.key = ptr_to_u64(key); 392 attr.value = ptr_to_u64(value); 393 394 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 395 } 396 397 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 398 { 399 union bpf_attr attr; 400 401 memset(&attr, 0, sizeof(attr)); 402 attr.map_fd = fd; 403 attr.key = ptr_to_u64(key); 404 attr.value = ptr_to_u64(value); 405 attr.flags = flags; 406 407 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 408 } 409 410 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 411 { 412 union bpf_attr attr; 413 414 memset(&attr, 0, sizeof(attr)); 415 attr.map_fd = fd; 416 attr.key = ptr_to_u64(key); 417 attr.value = ptr_to_u64(value); 418 419 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 420 } 421 422 int bpf_map_delete_elem(int fd, const void *key) 423 { 424 union bpf_attr attr; 425 426 memset(&attr, 0, sizeof(attr)); 427 attr.map_fd = fd; 428 attr.key = ptr_to_u64(key); 429 430 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 431 } 432 433 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 434 { 435 union bpf_attr attr; 436 437 memset(&attr, 0, sizeof(attr)); 438 attr.map_fd = fd; 439 attr.key = ptr_to_u64(key); 440 attr.next_key = ptr_to_u64(next_key); 441 442 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 443 } 444 445 int bpf_map_freeze(int fd) 446 { 447 union bpf_attr attr; 448 449 memset(&attr, 0, sizeof(attr)); 450 attr.map_fd = fd; 451 452 return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 453 } 454 455 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 456 void *out_batch, void *keys, void *values, 457 __u32 *count, 458 const struct bpf_map_batch_opts *opts) 459 { 460 union bpf_attr attr; 461 int ret; 462 463 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 464 return -EINVAL; 465 466 memset(&attr, 0, sizeof(attr)); 467 attr.batch.map_fd = fd; 468 attr.batch.in_batch = ptr_to_u64(in_batch); 469 attr.batch.out_batch = ptr_to_u64(out_batch); 470 attr.batch.keys = ptr_to_u64(keys); 471 attr.batch.values = ptr_to_u64(values); 472 attr.batch.count = *count; 473 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 474 attr.batch.flags = OPTS_GET(opts, flags, 0); 475 476 ret = sys_bpf(cmd, &attr, sizeof(attr)); 477 *count = attr.batch.count; 478 479 return ret; 480 } 481 482 int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 483 const struct bpf_map_batch_opts *opts) 484 { 485 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 486 NULL, keys, NULL, count, opts); 487 } 488 489 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 490 void *values, __u32 *count, 491 const struct bpf_map_batch_opts *opts) 492 { 493 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 494 out_batch, keys, values, count, opts); 495 } 496 497 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 498 void *keys, void *values, __u32 *count, 499 const struct bpf_map_batch_opts *opts) 500 { 501 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 502 fd, in_batch, out_batch, keys, values, 503 count, opts); 504 } 505 506 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 507 const struct bpf_map_batch_opts *opts) 508 { 509 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 510 keys, values, count, opts); 511 } 512 513 int bpf_obj_pin(int fd, const char *pathname) 514 { 515 union bpf_attr attr; 516 517 memset(&attr, 0, sizeof(attr)); 518 attr.pathname = ptr_to_u64((void *)pathname); 519 attr.bpf_fd = fd; 520 521 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 522 } 523 524 int bpf_obj_get(const char *pathname) 525 { 526 union bpf_attr attr; 527 528 memset(&attr, 0, sizeof(attr)); 529 attr.pathname = ptr_to_u64((void *)pathname); 530 531 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 532 } 533 534 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 535 unsigned int flags) 536 { 537 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 538 .flags = flags, 539 ); 540 541 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 542 } 543 544 int bpf_prog_attach_xattr(int prog_fd, int target_fd, 545 enum bpf_attach_type type, 546 const struct bpf_prog_attach_opts *opts) 547 { 548 union bpf_attr attr; 549 550 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 551 return -EINVAL; 552 553 memset(&attr, 0, sizeof(attr)); 554 attr.target_fd = target_fd; 555 attr.attach_bpf_fd = prog_fd; 556 attr.attach_type = type; 557 attr.attach_flags = OPTS_GET(opts, flags, 0); 558 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 559 560 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 561 } 562 563 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 564 { 565 union bpf_attr attr; 566 567 memset(&attr, 0, sizeof(attr)); 568 attr.target_fd = target_fd; 569 attr.attach_type = type; 570 571 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 572 } 573 574 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 575 { 576 union bpf_attr attr; 577 578 memset(&attr, 0, sizeof(attr)); 579 attr.target_fd = target_fd; 580 attr.attach_bpf_fd = prog_fd; 581 attr.attach_type = type; 582 583 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 584 } 585 586 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 587 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 588 { 589 union bpf_attr attr; 590 int ret; 591 592 memset(&attr, 0, sizeof(attr)); 593 attr.query.target_fd = target_fd; 594 attr.query.attach_type = type; 595 attr.query.query_flags = query_flags; 596 attr.query.prog_cnt = *prog_cnt; 597 attr.query.prog_ids = ptr_to_u64(prog_ids); 598 599 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 600 if (attach_flags) 601 *attach_flags = attr.query.attach_flags; 602 *prog_cnt = attr.query.prog_cnt; 603 return ret; 604 } 605 606 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 607 void *data_out, __u32 *size_out, __u32 *retval, 608 __u32 *duration) 609 { 610 union bpf_attr attr; 611 int ret; 612 613 memset(&attr, 0, sizeof(attr)); 614 attr.test.prog_fd = prog_fd; 615 attr.test.data_in = ptr_to_u64(data); 616 attr.test.data_out = ptr_to_u64(data_out); 617 attr.test.data_size_in = size; 618 attr.test.repeat = repeat; 619 620 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 621 if (size_out) 622 *size_out = attr.test.data_size_out; 623 if (retval) 624 *retval = attr.test.retval; 625 if (duration) 626 *duration = attr.test.duration; 627 return ret; 628 } 629 630 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 631 { 632 union bpf_attr attr; 633 int ret; 634 635 if (!test_attr->data_out && test_attr->data_size_out > 0) 636 return -EINVAL; 637 638 memset(&attr, 0, sizeof(attr)); 639 attr.test.prog_fd = test_attr->prog_fd; 640 attr.test.data_in = ptr_to_u64(test_attr->data_in); 641 attr.test.data_out = ptr_to_u64(test_attr->data_out); 642 attr.test.data_size_in = test_attr->data_size_in; 643 attr.test.data_size_out = test_attr->data_size_out; 644 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 645 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 646 attr.test.ctx_size_in = test_attr->ctx_size_in; 647 attr.test.ctx_size_out = test_attr->ctx_size_out; 648 attr.test.repeat = test_attr->repeat; 649 650 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 651 test_attr->data_size_out = attr.test.data_size_out; 652 test_attr->ctx_size_out = attr.test.ctx_size_out; 653 test_attr->retval = attr.test.retval; 654 test_attr->duration = attr.test.duration; 655 return ret; 656 } 657 658 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 659 { 660 union bpf_attr attr; 661 int err; 662 663 memset(&attr, 0, sizeof(attr)); 664 attr.start_id = start_id; 665 666 err = sys_bpf(cmd, &attr, sizeof(attr)); 667 if (!err) 668 *next_id = attr.next_id; 669 670 return err; 671 } 672 673 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 674 { 675 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 676 } 677 678 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 679 { 680 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 681 } 682 683 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 684 { 685 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 686 } 687 688 int bpf_prog_get_fd_by_id(__u32 id) 689 { 690 union bpf_attr attr; 691 692 memset(&attr, 0, sizeof(attr)); 693 attr.prog_id = id; 694 695 return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 696 } 697 698 int bpf_map_get_fd_by_id(__u32 id) 699 { 700 union bpf_attr attr; 701 702 memset(&attr, 0, sizeof(attr)); 703 attr.map_id = id; 704 705 return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 706 } 707 708 int bpf_btf_get_fd_by_id(__u32 id) 709 { 710 union bpf_attr attr; 711 712 memset(&attr, 0, sizeof(attr)); 713 attr.btf_id = id; 714 715 return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 716 } 717 718 int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len) 719 { 720 union bpf_attr attr; 721 int err; 722 723 memset(&attr, 0, sizeof(attr)); 724 attr.info.bpf_fd = prog_fd; 725 attr.info.info_len = *info_len; 726 attr.info.info = ptr_to_u64(info); 727 728 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 729 if (!err) 730 *info_len = attr.info.info_len; 731 732 return err; 733 } 734 735 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 736 { 737 union bpf_attr attr; 738 739 memset(&attr, 0, sizeof(attr)); 740 attr.raw_tracepoint.name = ptr_to_u64(name); 741 attr.raw_tracepoint.prog_fd = prog_fd; 742 743 return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 744 } 745 746 int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 747 bool do_log) 748 { 749 union bpf_attr attr = {}; 750 int fd; 751 752 attr.btf = ptr_to_u64(btf); 753 attr.btf_size = btf_size; 754 755 retry: 756 if (do_log && log_buf && log_buf_size) { 757 attr.btf_log_level = 1; 758 attr.btf_log_size = log_buf_size; 759 attr.btf_log_buf = ptr_to_u64(log_buf); 760 } 761 762 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 763 if (fd == -1 && !do_log && log_buf && log_buf_size) { 764 do_log = true; 765 goto retry; 766 } 767 768 return fd; 769 } 770 771 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 772 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 773 __u64 *probe_addr) 774 { 775 union bpf_attr attr = {}; 776 int err; 777 778 attr.task_fd_query.pid = pid; 779 attr.task_fd_query.fd = fd; 780 attr.task_fd_query.flags = flags; 781 attr.task_fd_query.buf = ptr_to_u64(buf); 782 attr.task_fd_query.buf_len = *buf_len; 783 784 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 785 *buf_len = attr.task_fd_query.buf_len; 786 *prog_id = attr.task_fd_query.prog_id; 787 *fd_type = attr.task_fd_query.fd_type; 788 *probe_offset = attr.task_fd_query.probe_offset; 789 *probe_addr = attr.task_fd_query.probe_addr; 790 791 return err; 792 } 793