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 retries = 5; 71 int fd; 72 73 do { 74 fd = sys_bpf(BPF_PROG_LOAD, attr, size); 75 } while (fd < 0 && errno == EAGAIN && retries-- > 0); 76 77 return fd; 78 } 79 80 int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) 81 { 82 union bpf_attr attr; 83 int fd; 84 85 memset(&attr, '\0', sizeof(attr)); 86 87 attr.map_type = create_attr->map_type; 88 attr.key_size = create_attr->key_size; 89 attr.value_size = create_attr->value_size; 90 attr.max_entries = create_attr->max_entries; 91 attr.map_flags = create_attr->map_flags; 92 if (create_attr->name) 93 memcpy(attr.map_name, create_attr->name, 94 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1)); 95 attr.numa_node = create_attr->numa_node; 96 attr.btf_fd = create_attr->btf_fd; 97 attr.btf_key_type_id = create_attr->btf_key_type_id; 98 attr.btf_value_type_id = create_attr->btf_value_type_id; 99 attr.map_ifindex = create_attr->map_ifindex; 100 if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS) 101 attr.btf_vmlinux_value_type_id = 102 create_attr->btf_vmlinux_value_type_id; 103 else 104 attr.inner_map_fd = create_attr->inner_map_fd; 105 106 fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 107 return libbpf_err_errno(fd); 108 } 109 110 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 int fd; 166 167 memset(&attr, '\0', sizeof(attr)); 168 169 attr.map_type = map_type; 170 attr.key_size = key_size; 171 attr.value_size = 4; 172 attr.inner_map_fd = inner_map_fd; 173 attr.max_entries = max_entries; 174 attr.map_flags = map_flags; 175 if (name) 176 memcpy(attr.map_name, name, 177 min(strlen(name), BPF_OBJ_NAME_LEN - 1)); 178 179 if (node >= 0) { 180 attr.map_flags |= BPF_F_NUMA_NODE; 181 attr.numa_node = node; 182 } 183 184 fd = sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 185 return libbpf_err_errno(fd); 186 } 187 188 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, 189 int key_size, int inner_map_fd, int max_entries, 190 __u32 map_flags) 191 { 192 return bpf_create_map_in_map_node(map_type, name, key_size, 193 inner_map_fd, max_entries, map_flags, 194 -1); 195 } 196 197 static void * 198 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 199 __u32 actual_rec_size, __u32 expected_rec_size) 200 { 201 __u64 info_len = (__u64)actual_rec_size * cnt; 202 void *info, *nrecord; 203 int i; 204 205 info = malloc(info_len); 206 if (!info) 207 return NULL; 208 209 /* zero out bytes kernel does not understand */ 210 nrecord = info; 211 for (i = 0; i < cnt; i++) { 212 memcpy(nrecord, orecord, expected_rec_size); 213 memset(nrecord + expected_rec_size, 0, 214 actual_rec_size - expected_rec_size); 215 orecord += actual_rec_size; 216 nrecord += actual_rec_size; 217 } 218 219 return info; 220 } 221 222 int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 223 { 224 void *finfo = NULL, *linfo = NULL; 225 union bpf_attr attr; 226 int fd; 227 228 if (!load_attr->log_buf != !load_attr->log_buf_sz) 229 return libbpf_err(-EINVAL); 230 231 if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf)) 232 return libbpf_err(-EINVAL); 233 234 memset(&attr, 0, sizeof(attr)); 235 attr.prog_type = load_attr->prog_type; 236 attr.expected_attach_type = load_attr->expected_attach_type; 237 238 if (load_attr->attach_prog_fd) 239 attr.attach_prog_fd = load_attr->attach_prog_fd; 240 else 241 attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd; 242 attr.attach_btf_id = load_attr->attach_btf_id; 243 244 attr.prog_ifindex = load_attr->prog_ifindex; 245 attr.kern_version = load_attr->kern_version; 246 247 attr.insn_cnt = (__u32)load_attr->insn_cnt; 248 attr.insns = ptr_to_u64(load_attr->insns); 249 attr.license = ptr_to_u64(load_attr->license); 250 251 attr.log_level = load_attr->log_level; 252 if (attr.log_level) { 253 attr.log_buf = ptr_to_u64(load_attr->log_buf); 254 attr.log_size = load_attr->log_buf_sz; 255 } 256 257 attr.prog_btf_fd = load_attr->prog_btf_fd; 258 attr.prog_flags = load_attr->prog_flags; 259 260 attr.func_info_rec_size = load_attr->func_info_rec_size; 261 attr.func_info_cnt = load_attr->func_info_cnt; 262 attr.func_info = ptr_to_u64(load_attr->func_info); 263 264 attr.line_info_rec_size = load_attr->line_info_rec_size; 265 attr.line_info_cnt = load_attr->line_info_cnt; 266 attr.line_info = ptr_to_u64(load_attr->line_info); 267 attr.fd_array = ptr_to_u64(load_attr->fd_array); 268 269 if (load_attr->name) 270 memcpy(attr.prog_name, load_attr->name, 271 min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1)); 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 errno = E2BIG; 291 goto done; 292 } 293 294 attr.func_info = ptr_to_u64(finfo); 295 attr.func_info_rec_size = load_attr->func_info_rec_size; 296 } else if (!linfo && attr.line_info_cnt && 297 attr.line_info_rec_size < 298 load_attr->line_info_rec_size) { 299 linfo = alloc_zero_tailing_info(load_attr->line_info, 300 load_attr->line_info_cnt, 301 load_attr->line_info_rec_size, 302 attr.line_info_rec_size); 303 if (!linfo) { 304 errno = E2BIG; 305 goto done; 306 } 307 308 attr.line_info = ptr_to_u64(linfo); 309 attr.line_info_rec_size = load_attr->line_info_rec_size; 310 } else { 311 break; 312 } 313 314 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 315 if (fd >= 0) 316 goto done; 317 } 318 319 if (load_attr->log_level || !load_attr->log_buf) 320 goto done; 321 322 /* Try again with log */ 323 attr.log_buf = ptr_to_u64(load_attr->log_buf); 324 attr.log_size = load_attr->log_buf_sz; 325 attr.log_level = 1; 326 load_attr->log_buf[0] = 0; 327 328 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 329 done: 330 /* free() doesn't affect errno, so we don't need to restore it */ 331 free(finfo); 332 free(linfo); 333 return libbpf_err_errno(fd); 334 } 335 336 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 337 char *log_buf, size_t log_buf_sz) 338 { 339 struct bpf_prog_load_params p = {}; 340 341 if (!load_attr || !log_buf != !log_buf_sz) 342 return libbpf_err(-EINVAL); 343 344 p.prog_type = load_attr->prog_type; 345 p.expected_attach_type = load_attr->expected_attach_type; 346 switch (p.prog_type) { 347 case BPF_PROG_TYPE_STRUCT_OPS: 348 case BPF_PROG_TYPE_LSM: 349 p.attach_btf_id = load_attr->attach_btf_id; 350 break; 351 case BPF_PROG_TYPE_TRACING: 352 case BPF_PROG_TYPE_EXT: 353 p.attach_btf_id = load_attr->attach_btf_id; 354 p.attach_prog_fd = load_attr->attach_prog_fd; 355 break; 356 default: 357 p.prog_ifindex = load_attr->prog_ifindex; 358 p.kern_version = load_attr->kern_version; 359 } 360 p.insn_cnt = load_attr->insns_cnt; 361 p.insns = load_attr->insns; 362 p.license = load_attr->license; 363 p.log_level = load_attr->log_level; 364 p.log_buf = log_buf; 365 p.log_buf_sz = log_buf_sz; 366 p.prog_btf_fd = load_attr->prog_btf_fd; 367 p.func_info_rec_size = load_attr->func_info_rec_size; 368 p.func_info_cnt = load_attr->func_info_cnt; 369 p.func_info = load_attr->func_info; 370 p.line_info_rec_size = load_attr->line_info_rec_size; 371 p.line_info_cnt = load_attr->line_info_cnt; 372 p.line_info = load_attr->line_info; 373 p.name = load_attr->name; 374 p.prog_flags = load_attr->prog_flags; 375 376 return libbpf__bpf_prog_load(&p); 377 } 378 379 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 380 size_t insns_cnt, const char *license, 381 __u32 kern_version, char *log_buf, 382 size_t log_buf_sz) 383 { 384 struct bpf_load_program_attr load_attr; 385 386 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 387 load_attr.prog_type = type; 388 load_attr.expected_attach_type = 0; 389 load_attr.name = NULL; 390 load_attr.insns = insns; 391 load_attr.insns_cnt = insns_cnt; 392 load_attr.license = license; 393 load_attr.kern_version = kern_version; 394 395 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 396 } 397 398 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 399 size_t insns_cnt, __u32 prog_flags, const char *license, 400 __u32 kern_version, char *log_buf, size_t log_buf_sz, 401 int log_level) 402 { 403 union bpf_attr attr; 404 int fd; 405 406 memset(&attr, 0, sizeof(attr)); 407 attr.prog_type = type; 408 attr.insn_cnt = (__u32)insns_cnt; 409 attr.insns = ptr_to_u64(insns); 410 attr.license = ptr_to_u64(license); 411 attr.log_buf = ptr_to_u64(log_buf); 412 attr.log_size = log_buf_sz; 413 attr.log_level = log_level; 414 log_buf[0] = 0; 415 attr.kern_version = kern_version; 416 attr.prog_flags = prog_flags; 417 418 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 419 return libbpf_err_errno(fd); 420 } 421 422 int bpf_map_update_elem(int fd, const void *key, const void *value, 423 __u64 flags) 424 { 425 union bpf_attr attr; 426 int ret; 427 428 memset(&attr, 0, sizeof(attr)); 429 attr.map_fd = fd; 430 attr.key = ptr_to_u64(key); 431 attr.value = ptr_to_u64(value); 432 attr.flags = flags; 433 434 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 435 return libbpf_err_errno(ret); 436 } 437 438 int bpf_map_lookup_elem(int fd, const void *key, void *value) 439 { 440 union bpf_attr attr; 441 int ret; 442 443 memset(&attr, 0, sizeof(attr)); 444 attr.map_fd = fd; 445 attr.key = ptr_to_u64(key); 446 attr.value = ptr_to_u64(value); 447 448 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 449 return libbpf_err_errno(ret); 450 } 451 452 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 453 { 454 union bpf_attr attr; 455 int ret; 456 457 memset(&attr, 0, sizeof(attr)); 458 attr.map_fd = fd; 459 attr.key = ptr_to_u64(key); 460 attr.value = ptr_to_u64(value); 461 attr.flags = flags; 462 463 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 464 return libbpf_err_errno(ret); 465 } 466 467 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 468 { 469 union bpf_attr attr; 470 int ret; 471 472 memset(&attr, 0, sizeof(attr)); 473 attr.map_fd = fd; 474 attr.key = ptr_to_u64(key); 475 attr.value = ptr_to_u64(value); 476 477 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 478 return libbpf_err_errno(ret); 479 } 480 481 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags) 482 { 483 union bpf_attr attr; 484 485 memset(&attr, 0, sizeof(attr)); 486 attr.map_fd = fd; 487 attr.key = ptr_to_u64(key); 488 attr.value = ptr_to_u64(value); 489 attr.flags = flags; 490 491 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 492 } 493 494 int bpf_map_delete_elem(int fd, const void *key) 495 { 496 union bpf_attr attr; 497 int ret; 498 499 memset(&attr, 0, sizeof(attr)); 500 attr.map_fd = fd; 501 attr.key = ptr_to_u64(key); 502 503 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 504 return libbpf_err_errno(ret); 505 } 506 507 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 508 { 509 union bpf_attr attr; 510 int ret; 511 512 memset(&attr, 0, sizeof(attr)); 513 attr.map_fd = fd; 514 attr.key = ptr_to_u64(key); 515 attr.next_key = ptr_to_u64(next_key); 516 517 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 518 return libbpf_err_errno(ret); 519 } 520 521 int bpf_map_freeze(int fd) 522 { 523 union bpf_attr attr; 524 int ret; 525 526 memset(&attr, 0, sizeof(attr)); 527 attr.map_fd = fd; 528 529 ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 530 return libbpf_err_errno(ret); 531 } 532 533 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 534 void *out_batch, void *keys, void *values, 535 __u32 *count, 536 const struct bpf_map_batch_opts *opts) 537 { 538 union bpf_attr attr; 539 int ret; 540 541 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 542 return libbpf_err(-EINVAL); 543 544 memset(&attr, 0, sizeof(attr)); 545 attr.batch.map_fd = fd; 546 attr.batch.in_batch = ptr_to_u64(in_batch); 547 attr.batch.out_batch = ptr_to_u64(out_batch); 548 attr.batch.keys = ptr_to_u64(keys); 549 attr.batch.values = ptr_to_u64(values); 550 attr.batch.count = *count; 551 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 552 attr.batch.flags = OPTS_GET(opts, flags, 0); 553 554 ret = sys_bpf(cmd, &attr, sizeof(attr)); 555 *count = attr.batch.count; 556 557 return libbpf_err_errno(ret); 558 } 559 560 int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 561 const struct bpf_map_batch_opts *opts) 562 { 563 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 564 NULL, keys, NULL, count, opts); 565 } 566 567 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 568 void *values, __u32 *count, 569 const struct bpf_map_batch_opts *opts) 570 { 571 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 572 out_batch, keys, values, count, opts); 573 } 574 575 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 576 void *keys, void *values, __u32 *count, 577 const struct bpf_map_batch_opts *opts) 578 { 579 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 580 fd, in_batch, out_batch, keys, values, 581 count, opts); 582 } 583 584 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 585 const struct bpf_map_batch_opts *opts) 586 { 587 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 588 keys, values, count, opts); 589 } 590 591 int bpf_obj_pin(int fd, const char *pathname) 592 { 593 union bpf_attr attr; 594 int ret; 595 596 memset(&attr, 0, sizeof(attr)); 597 attr.pathname = ptr_to_u64((void *)pathname); 598 attr.bpf_fd = fd; 599 600 ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 601 return libbpf_err_errno(ret); 602 } 603 604 int bpf_obj_get(const char *pathname) 605 { 606 union bpf_attr attr; 607 int fd; 608 609 memset(&attr, 0, sizeof(attr)); 610 attr.pathname = ptr_to_u64((void *)pathname); 611 612 fd = sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 613 return libbpf_err_errno(fd); 614 } 615 616 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 617 unsigned int flags) 618 { 619 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 620 .flags = flags, 621 ); 622 623 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 624 } 625 626 int bpf_prog_attach_xattr(int prog_fd, int target_fd, 627 enum bpf_attach_type type, 628 const struct bpf_prog_attach_opts *opts) 629 { 630 union bpf_attr attr; 631 int ret; 632 633 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 634 return libbpf_err(-EINVAL); 635 636 memset(&attr, 0, sizeof(attr)); 637 attr.target_fd = target_fd; 638 attr.attach_bpf_fd = prog_fd; 639 attr.attach_type = type; 640 attr.attach_flags = OPTS_GET(opts, flags, 0); 641 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 642 643 ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 644 return libbpf_err_errno(ret); 645 } 646 647 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 648 { 649 union bpf_attr attr; 650 int ret; 651 652 memset(&attr, 0, sizeof(attr)); 653 attr.target_fd = target_fd; 654 attr.attach_type = type; 655 656 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 657 return libbpf_err_errno(ret); 658 } 659 660 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 661 { 662 union bpf_attr attr; 663 int ret; 664 665 memset(&attr, 0, sizeof(attr)); 666 attr.target_fd = target_fd; 667 attr.attach_bpf_fd = prog_fd; 668 attr.attach_type = type; 669 670 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 671 return libbpf_err_errno(ret); 672 } 673 674 int bpf_link_create(int prog_fd, int target_fd, 675 enum bpf_attach_type attach_type, 676 const struct bpf_link_create_opts *opts) 677 { 678 __u32 target_btf_id, iter_info_len; 679 union bpf_attr attr; 680 int fd; 681 682 if (!OPTS_VALID(opts, bpf_link_create_opts)) 683 return libbpf_err(-EINVAL); 684 685 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 686 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 687 688 /* validate we don't have unexpected combinations of non-zero fields */ 689 if (iter_info_len || target_btf_id) { 690 if (iter_info_len && target_btf_id) 691 return libbpf_err(-EINVAL); 692 if (!OPTS_ZEROED(opts, target_btf_id)) 693 return libbpf_err(-EINVAL); 694 } 695 696 memset(&attr, 0, sizeof(attr)); 697 attr.link_create.prog_fd = prog_fd; 698 attr.link_create.target_fd = target_fd; 699 attr.link_create.attach_type = attach_type; 700 attr.link_create.flags = OPTS_GET(opts, flags, 0); 701 702 if (target_btf_id) { 703 attr.link_create.target_btf_id = target_btf_id; 704 goto proceed; 705 } 706 707 switch (attach_type) { 708 case BPF_TRACE_ITER: 709 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 710 attr.link_create.iter_info_len = iter_info_len; 711 break; 712 case BPF_PERF_EVENT: 713 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0); 714 if (!OPTS_ZEROED(opts, perf_event)) 715 return libbpf_err(-EINVAL); 716 break; 717 default: 718 if (!OPTS_ZEROED(opts, flags)) 719 return libbpf_err(-EINVAL); 720 break; 721 } 722 proceed: 723 fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr)); 724 return libbpf_err_errno(fd); 725 } 726 727 int bpf_link_detach(int link_fd) 728 { 729 union bpf_attr attr; 730 int ret; 731 732 memset(&attr, 0, sizeof(attr)); 733 attr.link_detach.link_fd = link_fd; 734 735 ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr)); 736 return libbpf_err_errno(ret); 737 } 738 739 int bpf_link_update(int link_fd, int new_prog_fd, 740 const struct bpf_link_update_opts *opts) 741 { 742 union bpf_attr attr; 743 int ret; 744 745 if (!OPTS_VALID(opts, bpf_link_update_opts)) 746 return libbpf_err(-EINVAL); 747 748 memset(&attr, 0, sizeof(attr)); 749 attr.link_update.link_fd = link_fd; 750 attr.link_update.new_prog_fd = new_prog_fd; 751 attr.link_update.flags = OPTS_GET(opts, flags, 0); 752 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 753 754 ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr)); 755 return libbpf_err_errno(ret); 756 } 757 758 int bpf_iter_create(int link_fd) 759 { 760 union bpf_attr attr; 761 int fd; 762 763 memset(&attr, 0, sizeof(attr)); 764 attr.iter_create.link_fd = link_fd; 765 766 fd = sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr)); 767 return libbpf_err_errno(fd); 768 } 769 770 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 771 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 772 { 773 union bpf_attr attr; 774 int ret; 775 776 memset(&attr, 0, sizeof(attr)); 777 attr.query.target_fd = target_fd; 778 attr.query.attach_type = type; 779 attr.query.query_flags = query_flags; 780 attr.query.prog_cnt = *prog_cnt; 781 attr.query.prog_ids = ptr_to_u64(prog_ids); 782 783 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 784 785 if (attach_flags) 786 *attach_flags = attr.query.attach_flags; 787 *prog_cnt = attr.query.prog_cnt; 788 789 return libbpf_err_errno(ret); 790 } 791 792 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 793 void *data_out, __u32 *size_out, __u32 *retval, 794 __u32 *duration) 795 { 796 union bpf_attr attr; 797 int ret; 798 799 memset(&attr, 0, sizeof(attr)); 800 attr.test.prog_fd = prog_fd; 801 attr.test.data_in = ptr_to_u64(data); 802 attr.test.data_out = ptr_to_u64(data_out); 803 attr.test.data_size_in = size; 804 attr.test.repeat = repeat; 805 806 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 807 808 if (size_out) 809 *size_out = attr.test.data_size_out; 810 if (retval) 811 *retval = attr.test.retval; 812 if (duration) 813 *duration = attr.test.duration; 814 815 return libbpf_err_errno(ret); 816 } 817 818 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 819 { 820 union bpf_attr attr; 821 int ret; 822 823 if (!test_attr->data_out && test_attr->data_size_out > 0) 824 return libbpf_err(-EINVAL); 825 826 memset(&attr, 0, sizeof(attr)); 827 attr.test.prog_fd = test_attr->prog_fd; 828 attr.test.data_in = ptr_to_u64(test_attr->data_in); 829 attr.test.data_out = ptr_to_u64(test_attr->data_out); 830 attr.test.data_size_in = test_attr->data_size_in; 831 attr.test.data_size_out = test_attr->data_size_out; 832 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 833 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 834 attr.test.ctx_size_in = test_attr->ctx_size_in; 835 attr.test.ctx_size_out = test_attr->ctx_size_out; 836 attr.test.repeat = test_attr->repeat; 837 838 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 839 840 test_attr->data_size_out = attr.test.data_size_out; 841 test_attr->ctx_size_out = attr.test.ctx_size_out; 842 test_attr->retval = attr.test.retval; 843 test_attr->duration = attr.test.duration; 844 845 return libbpf_err_errno(ret); 846 } 847 848 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 849 { 850 union bpf_attr attr; 851 int ret; 852 853 if (!OPTS_VALID(opts, bpf_test_run_opts)) 854 return libbpf_err(-EINVAL); 855 856 memset(&attr, 0, sizeof(attr)); 857 attr.test.prog_fd = prog_fd; 858 attr.test.cpu = OPTS_GET(opts, cpu, 0); 859 attr.test.flags = OPTS_GET(opts, flags, 0); 860 attr.test.repeat = OPTS_GET(opts, repeat, 0); 861 attr.test.duration = OPTS_GET(opts, duration, 0); 862 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 863 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 864 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 865 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 866 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 867 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 868 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 869 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 870 871 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 872 873 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 874 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 875 OPTS_SET(opts, duration, attr.test.duration); 876 OPTS_SET(opts, retval, attr.test.retval); 877 878 return libbpf_err_errno(ret); 879 } 880 881 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 882 { 883 union bpf_attr attr; 884 int err; 885 886 memset(&attr, 0, sizeof(attr)); 887 attr.start_id = start_id; 888 889 err = sys_bpf(cmd, &attr, sizeof(attr)); 890 if (!err) 891 *next_id = attr.next_id; 892 893 return libbpf_err_errno(err); 894 } 895 896 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 897 { 898 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 899 } 900 901 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 902 { 903 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 904 } 905 906 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 907 { 908 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 909 } 910 911 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 912 { 913 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 914 } 915 916 int bpf_prog_get_fd_by_id(__u32 id) 917 { 918 union bpf_attr attr; 919 int fd; 920 921 memset(&attr, 0, sizeof(attr)); 922 attr.prog_id = id; 923 924 fd = sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 925 return libbpf_err_errno(fd); 926 } 927 928 int bpf_map_get_fd_by_id(__u32 id) 929 { 930 union bpf_attr attr; 931 int fd; 932 933 memset(&attr, 0, sizeof(attr)); 934 attr.map_id = id; 935 936 fd = sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 937 return libbpf_err_errno(fd); 938 } 939 940 int bpf_btf_get_fd_by_id(__u32 id) 941 { 942 union bpf_attr attr; 943 int fd; 944 945 memset(&attr, 0, sizeof(attr)); 946 attr.btf_id = id; 947 948 fd = sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 949 return libbpf_err_errno(fd); 950 } 951 952 int bpf_link_get_fd_by_id(__u32 id) 953 { 954 union bpf_attr attr; 955 int fd; 956 957 memset(&attr, 0, sizeof(attr)); 958 attr.link_id = id; 959 960 fd = sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr)); 961 return libbpf_err_errno(fd); 962 } 963 964 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 965 { 966 union bpf_attr attr; 967 int err; 968 969 memset(&attr, 0, sizeof(attr)); 970 attr.info.bpf_fd = bpf_fd; 971 attr.info.info_len = *info_len; 972 attr.info.info = ptr_to_u64(info); 973 974 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 975 976 if (!err) 977 *info_len = attr.info.info_len; 978 979 return libbpf_err_errno(err); 980 } 981 982 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 983 { 984 union bpf_attr attr; 985 int fd; 986 987 memset(&attr, 0, sizeof(attr)); 988 attr.raw_tracepoint.name = ptr_to_u64(name); 989 attr.raw_tracepoint.prog_fd = prog_fd; 990 991 fd = sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 992 return libbpf_err_errno(fd); 993 } 994 995 int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 996 bool do_log) 997 { 998 union bpf_attr attr = {}; 999 int fd; 1000 1001 attr.btf = ptr_to_u64(btf); 1002 attr.btf_size = btf_size; 1003 1004 retry: 1005 if (do_log && log_buf && log_buf_size) { 1006 attr.btf_log_level = 1; 1007 attr.btf_log_size = log_buf_size; 1008 attr.btf_log_buf = ptr_to_u64(log_buf); 1009 } 1010 1011 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 1012 1013 if (fd < 0 && !do_log && log_buf && log_buf_size) { 1014 do_log = true; 1015 goto retry; 1016 } 1017 1018 return libbpf_err_errno(fd); 1019 } 1020 1021 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 1022 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 1023 __u64 *probe_addr) 1024 { 1025 union bpf_attr attr = {}; 1026 int err; 1027 1028 attr.task_fd_query.pid = pid; 1029 attr.task_fd_query.fd = fd; 1030 attr.task_fd_query.flags = flags; 1031 attr.task_fd_query.buf = ptr_to_u64(buf); 1032 attr.task_fd_query.buf_len = *buf_len; 1033 1034 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 1035 1036 *buf_len = attr.task_fd_query.buf_len; 1037 *prog_id = attr.task_fd_query.prog_id; 1038 *fd_type = attr.task_fd_query.fd_type; 1039 *probe_offset = attr.task_fd_query.probe_offset; 1040 *probe_addr = attr.task_fd_query.probe_addr; 1041 1042 return libbpf_err_errno(err); 1043 } 1044 1045 int bpf_enable_stats(enum bpf_stats_type type) 1046 { 1047 union bpf_attr attr; 1048 int fd; 1049 1050 memset(&attr, 0, sizeof(attr)); 1051 attr.enable_stats.type = type; 1052 1053 fd = sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr)); 1054 return libbpf_err_errno(fd); 1055 } 1056 1057 int bpf_prog_bind_map(int prog_fd, int map_fd, 1058 const struct bpf_prog_bind_opts *opts) 1059 { 1060 union bpf_attr attr; 1061 int ret; 1062 1063 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 1064 return libbpf_err(-EINVAL); 1065 1066 memset(&attr, 0, sizeof(attr)); 1067 attr.prog_bind_map.prog_fd = prog_fd; 1068 attr.prog_bind_map.map_fd = map_fd; 1069 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 1070 1071 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr)); 1072 return libbpf_err_errno(ret); 1073 } 1074