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.prog_type == BPF_PROG_TYPE_EXT) { 242 attr.attach_btf_id = load_attr->attach_btf_id; 243 attr.attach_prog_fd = load_attr->attach_prog_fd; 244 } else { 245 attr.prog_ifindex = load_attr->prog_ifindex; 246 attr.kern_version = load_attr->kern_version; 247 } 248 attr.insn_cnt = (__u32)load_attr->insns_cnt; 249 attr.insns = ptr_to_u64(load_attr->insns); 250 attr.license = ptr_to_u64(load_attr->license); 251 252 attr.log_level = log_level; 253 if (log_level) { 254 attr.log_buf = ptr_to_u64(log_buf); 255 attr.log_size = log_buf_sz; 256 } else { 257 attr.log_buf = ptr_to_u64(NULL); 258 attr.log_size = 0; 259 } 260 261 attr.prog_btf_fd = load_attr->prog_btf_fd; 262 attr.func_info_rec_size = load_attr->func_info_rec_size; 263 attr.func_info_cnt = load_attr->func_info_cnt; 264 attr.func_info = ptr_to_u64(load_attr->func_info); 265 attr.line_info_rec_size = load_attr->line_info_rec_size; 266 attr.line_info_cnt = load_attr->line_info_cnt; 267 attr.line_info = ptr_to_u64(load_attr->line_info); 268 if (load_attr->name) 269 memcpy(attr.prog_name, load_attr->name, 270 min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1)); 271 attr.prog_flags = load_attr->prog_flags; 272 273 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 274 if (fd >= 0) 275 return fd; 276 277 /* After bpf_prog_load, the kernel may modify certain attributes 278 * to give user space a hint how to deal with loading failure. 279 * Check to see whether we can make some changes and load again. 280 */ 281 while (errno == E2BIG && (!finfo || !linfo)) { 282 if (!finfo && attr.func_info_cnt && 283 attr.func_info_rec_size < load_attr->func_info_rec_size) { 284 /* try with corrected func info records */ 285 finfo = alloc_zero_tailing_info(load_attr->func_info, 286 load_attr->func_info_cnt, 287 load_attr->func_info_rec_size, 288 attr.func_info_rec_size); 289 if (!finfo) 290 goto done; 291 292 attr.func_info = ptr_to_u64(finfo); 293 attr.func_info_rec_size = load_attr->func_info_rec_size; 294 } else if (!linfo && attr.line_info_cnt && 295 attr.line_info_rec_size < 296 load_attr->line_info_rec_size) { 297 linfo = alloc_zero_tailing_info(load_attr->line_info, 298 load_attr->line_info_cnt, 299 load_attr->line_info_rec_size, 300 attr.line_info_rec_size); 301 if (!linfo) 302 goto done; 303 304 attr.line_info = ptr_to_u64(linfo); 305 attr.line_info_rec_size = load_attr->line_info_rec_size; 306 } else { 307 break; 308 } 309 310 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 311 312 if (fd >= 0) 313 goto done; 314 } 315 316 if (log_level || !log_buf) 317 goto done; 318 319 /* Try again with log */ 320 attr.log_buf = ptr_to_u64(log_buf); 321 attr.log_size = log_buf_sz; 322 attr.log_level = 1; 323 log_buf[0] = 0; 324 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 325 done: 326 free(finfo); 327 free(linfo); 328 return fd; 329 } 330 331 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 332 size_t insns_cnt, const char *license, 333 __u32 kern_version, char *log_buf, 334 size_t log_buf_sz) 335 { 336 struct bpf_load_program_attr load_attr; 337 338 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 339 load_attr.prog_type = type; 340 load_attr.expected_attach_type = 0; 341 load_attr.name = NULL; 342 load_attr.insns = insns; 343 load_attr.insns_cnt = insns_cnt; 344 load_attr.license = license; 345 load_attr.kern_version = kern_version; 346 347 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 348 } 349 350 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 351 size_t insns_cnt, __u32 prog_flags, const char *license, 352 __u32 kern_version, char *log_buf, size_t log_buf_sz, 353 int log_level) 354 { 355 union bpf_attr attr; 356 357 memset(&attr, 0, sizeof(attr)); 358 attr.prog_type = type; 359 attr.insn_cnt = (__u32)insns_cnt; 360 attr.insns = ptr_to_u64(insns); 361 attr.license = ptr_to_u64(license); 362 attr.log_buf = ptr_to_u64(log_buf); 363 attr.log_size = log_buf_sz; 364 attr.log_level = log_level; 365 log_buf[0] = 0; 366 attr.kern_version = kern_version; 367 attr.prog_flags = prog_flags; 368 369 return sys_bpf_prog_load(&attr, sizeof(attr)); 370 } 371 372 int bpf_map_update_elem(int fd, const void *key, const void *value, 373 __u64 flags) 374 { 375 union bpf_attr attr; 376 377 memset(&attr, 0, sizeof(attr)); 378 attr.map_fd = fd; 379 attr.key = ptr_to_u64(key); 380 attr.value = ptr_to_u64(value); 381 attr.flags = flags; 382 383 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 384 } 385 386 int bpf_map_lookup_elem(int fd, const void *key, void *value) 387 { 388 union bpf_attr attr; 389 390 memset(&attr, 0, sizeof(attr)); 391 attr.map_fd = fd; 392 attr.key = ptr_to_u64(key); 393 attr.value = ptr_to_u64(value); 394 395 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 396 } 397 398 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 399 { 400 union bpf_attr attr; 401 402 memset(&attr, 0, sizeof(attr)); 403 attr.map_fd = fd; 404 attr.key = ptr_to_u64(key); 405 attr.value = ptr_to_u64(value); 406 attr.flags = flags; 407 408 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 409 } 410 411 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 412 { 413 union bpf_attr attr; 414 415 memset(&attr, 0, sizeof(attr)); 416 attr.map_fd = fd; 417 attr.key = ptr_to_u64(key); 418 attr.value = ptr_to_u64(value); 419 420 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 421 } 422 423 int bpf_map_delete_elem(int fd, const void *key) 424 { 425 union bpf_attr attr; 426 427 memset(&attr, 0, sizeof(attr)); 428 attr.map_fd = fd; 429 attr.key = ptr_to_u64(key); 430 431 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 432 } 433 434 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 435 { 436 union bpf_attr attr; 437 438 memset(&attr, 0, sizeof(attr)); 439 attr.map_fd = fd; 440 attr.key = ptr_to_u64(key); 441 attr.next_key = ptr_to_u64(next_key); 442 443 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 444 } 445 446 int bpf_map_freeze(int fd) 447 { 448 union bpf_attr attr; 449 450 memset(&attr, 0, sizeof(attr)); 451 attr.map_fd = fd; 452 453 return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 454 } 455 456 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 457 void *out_batch, void *keys, void *values, 458 __u32 *count, 459 const struct bpf_map_batch_opts *opts) 460 { 461 union bpf_attr attr; 462 int ret; 463 464 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 465 return -EINVAL; 466 467 memset(&attr, 0, sizeof(attr)); 468 attr.batch.map_fd = fd; 469 attr.batch.in_batch = ptr_to_u64(in_batch); 470 attr.batch.out_batch = ptr_to_u64(out_batch); 471 attr.batch.keys = ptr_to_u64(keys); 472 attr.batch.values = ptr_to_u64(values); 473 attr.batch.count = *count; 474 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 475 attr.batch.flags = OPTS_GET(opts, flags, 0); 476 477 ret = sys_bpf(cmd, &attr, sizeof(attr)); 478 *count = attr.batch.count; 479 480 return ret; 481 } 482 483 int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 484 const struct bpf_map_batch_opts *opts) 485 { 486 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 487 NULL, keys, NULL, count, opts); 488 } 489 490 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 491 void *values, __u32 *count, 492 const struct bpf_map_batch_opts *opts) 493 { 494 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 495 out_batch, keys, values, count, opts); 496 } 497 498 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 499 void *keys, void *values, __u32 *count, 500 const struct bpf_map_batch_opts *opts) 501 { 502 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 503 fd, in_batch, out_batch, keys, values, 504 count, opts); 505 } 506 507 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 508 const struct bpf_map_batch_opts *opts) 509 { 510 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 511 keys, values, count, opts); 512 } 513 514 int bpf_obj_pin(int fd, const char *pathname) 515 { 516 union bpf_attr attr; 517 518 memset(&attr, 0, sizeof(attr)); 519 attr.pathname = ptr_to_u64((void *)pathname); 520 attr.bpf_fd = fd; 521 522 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 523 } 524 525 int bpf_obj_get(const char *pathname) 526 { 527 union bpf_attr attr; 528 529 memset(&attr, 0, sizeof(attr)); 530 attr.pathname = ptr_to_u64((void *)pathname); 531 532 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 533 } 534 535 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 536 unsigned int flags) 537 { 538 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 539 .flags = flags, 540 ); 541 542 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 543 } 544 545 int bpf_prog_attach_xattr(int prog_fd, int target_fd, 546 enum bpf_attach_type type, 547 const struct bpf_prog_attach_opts *opts) 548 { 549 union bpf_attr attr; 550 551 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 552 return -EINVAL; 553 554 memset(&attr, 0, sizeof(attr)); 555 attr.target_fd = target_fd; 556 attr.attach_bpf_fd = prog_fd; 557 attr.attach_type = type; 558 attr.attach_flags = OPTS_GET(opts, flags, 0); 559 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 560 561 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 562 } 563 564 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 565 { 566 union bpf_attr attr; 567 568 memset(&attr, 0, sizeof(attr)); 569 attr.target_fd = target_fd; 570 attr.attach_type = type; 571 572 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 573 } 574 575 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 576 { 577 union bpf_attr attr; 578 579 memset(&attr, 0, sizeof(attr)); 580 attr.target_fd = target_fd; 581 attr.attach_bpf_fd = prog_fd; 582 attr.attach_type = type; 583 584 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 585 } 586 587 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 588 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 589 { 590 union bpf_attr attr; 591 int ret; 592 593 memset(&attr, 0, sizeof(attr)); 594 attr.query.target_fd = target_fd; 595 attr.query.attach_type = type; 596 attr.query.query_flags = query_flags; 597 attr.query.prog_cnt = *prog_cnt; 598 attr.query.prog_ids = ptr_to_u64(prog_ids); 599 600 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 601 if (attach_flags) 602 *attach_flags = attr.query.attach_flags; 603 *prog_cnt = attr.query.prog_cnt; 604 return ret; 605 } 606 607 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 608 void *data_out, __u32 *size_out, __u32 *retval, 609 __u32 *duration) 610 { 611 union bpf_attr attr; 612 int ret; 613 614 memset(&attr, 0, sizeof(attr)); 615 attr.test.prog_fd = prog_fd; 616 attr.test.data_in = ptr_to_u64(data); 617 attr.test.data_out = ptr_to_u64(data_out); 618 attr.test.data_size_in = size; 619 attr.test.repeat = repeat; 620 621 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 622 if (size_out) 623 *size_out = attr.test.data_size_out; 624 if (retval) 625 *retval = attr.test.retval; 626 if (duration) 627 *duration = attr.test.duration; 628 return ret; 629 } 630 631 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 632 { 633 union bpf_attr attr; 634 int ret; 635 636 if (!test_attr->data_out && test_attr->data_size_out > 0) 637 return -EINVAL; 638 639 memset(&attr, 0, sizeof(attr)); 640 attr.test.prog_fd = test_attr->prog_fd; 641 attr.test.data_in = ptr_to_u64(test_attr->data_in); 642 attr.test.data_out = ptr_to_u64(test_attr->data_out); 643 attr.test.data_size_in = test_attr->data_size_in; 644 attr.test.data_size_out = test_attr->data_size_out; 645 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 646 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 647 attr.test.ctx_size_in = test_attr->ctx_size_in; 648 attr.test.ctx_size_out = test_attr->ctx_size_out; 649 attr.test.repeat = test_attr->repeat; 650 651 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 652 test_attr->data_size_out = attr.test.data_size_out; 653 test_attr->ctx_size_out = attr.test.ctx_size_out; 654 test_attr->retval = attr.test.retval; 655 test_attr->duration = attr.test.duration; 656 return ret; 657 } 658 659 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 660 { 661 union bpf_attr attr; 662 int err; 663 664 memset(&attr, 0, sizeof(attr)); 665 attr.start_id = start_id; 666 667 err = sys_bpf(cmd, &attr, sizeof(attr)); 668 if (!err) 669 *next_id = attr.next_id; 670 671 return err; 672 } 673 674 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 675 { 676 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 677 } 678 679 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 680 { 681 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 682 } 683 684 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 685 { 686 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 687 } 688 689 int bpf_prog_get_fd_by_id(__u32 id) 690 { 691 union bpf_attr attr; 692 693 memset(&attr, 0, sizeof(attr)); 694 attr.prog_id = id; 695 696 return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 697 } 698 699 int bpf_map_get_fd_by_id(__u32 id) 700 { 701 union bpf_attr attr; 702 703 memset(&attr, 0, sizeof(attr)); 704 attr.map_id = id; 705 706 return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 707 } 708 709 int bpf_btf_get_fd_by_id(__u32 id) 710 { 711 union bpf_attr attr; 712 713 memset(&attr, 0, sizeof(attr)); 714 attr.btf_id = id; 715 716 return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 717 } 718 719 int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len) 720 { 721 union bpf_attr attr; 722 int err; 723 724 memset(&attr, 0, sizeof(attr)); 725 attr.info.bpf_fd = prog_fd; 726 attr.info.info_len = *info_len; 727 attr.info.info = ptr_to_u64(info); 728 729 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 730 if (!err) 731 *info_len = attr.info.info_len; 732 733 return err; 734 } 735 736 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 737 { 738 union bpf_attr attr; 739 740 memset(&attr, 0, sizeof(attr)); 741 attr.raw_tracepoint.name = ptr_to_u64(name); 742 attr.raw_tracepoint.prog_fd = prog_fd; 743 744 return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 745 } 746 747 int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 748 bool do_log) 749 { 750 union bpf_attr attr = {}; 751 int fd; 752 753 attr.btf = ptr_to_u64(btf); 754 attr.btf_size = btf_size; 755 756 retry: 757 if (do_log && log_buf && log_buf_size) { 758 attr.btf_log_level = 1; 759 attr.btf_log_size = log_buf_size; 760 attr.btf_log_buf = ptr_to_u64(log_buf); 761 } 762 763 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 764 if (fd == -1 && !do_log && log_buf && log_buf_size) { 765 do_log = true; 766 goto retry; 767 } 768 769 return fd; 770 } 771 772 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 773 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 774 __u64 *probe_addr) 775 { 776 union bpf_attr attr = {}; 777 int err; 778 779 attr.task_fd_query.pid = pid; 780 attr.task_fd_query.fd = fd; 781 attr.task_fd_query.flags = flags; 782 attr.task_fd_query.buf = ptr_to_u64(buf); 783 attr.task_fd_query.buf_len = *buf_len; 784 785 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 786 *buf_len = attr.task_fd_query.buf_len; 787 *prog_id = attr.task_fd_query.prog_id; 788 *fd_type = attr.task_fd_query.fd_type; 789 *probe_offset = attr.task_fd_query.probe_offset; 790 *probe_addr = attr.task_fd_query.probe_addr; 791 792 return err; 793 } 794