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); 267 268 if (load_attr->name) 269 memcpy(attr.prog_name, load_attr->name, 270 min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1)); 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 errno = E2BIG; 290 goto done; 291 } 292 293 attr.func_info = ptr_to_u64(finfo); 294 attr.func_info_rec_size = load_attr->func_info_rec_size; 295 } else if (!linfo && attr.line_info_cnt && 296 attr.line_info_rec_size < 297 load_attr->line_info_rec_size) { 298 linfo = alloc_zero_tailing_info(load_attr->line_info, 299 load_attr->line_info_cnt, 300 load_attr->line_info_rec_size, 301 attr.line_info_rec_size); 302 if (!linfo) { 303 errno = E2BIG; 304 goto done; 305 } 306 307 attr.line_info = ptr_to_u64(linfo); 308 attr.line_info_rec_size = load_attr->line_info_rec_size; 309 } else { 310 break; 311 } 312 313 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 314 if (fd >= 0) 315 goto done; 316 } 317 318 if (load_attr->log_level || !load_attr->log_buf) 319 goto done; 320 321 /* Try again with log */ 322 attr.log_buf = ptr_to_u64(load_attr->log_buf); 323 attr.log_size = load_attr->log_buf_sz; 324 attr.log_level = 1; 325 load_attr->log_buf[0] = 0; 326 327 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 328 done: 329 /* free() doesn't affect errno, so we don't need to restore it */ 330 free(finfo); 331 free(linfo); 332 return libbpf_err_errno(fd); 333 } 334 335 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 336 char *log_buf, size_t log_buf_sz) 337 { 338 struct bpf_prog_load_params p = {}; 339 340 if (!load_attr || !log_buf != !log_buf_sz) 341 return libbpf_err(-EINVAL); 342 343 p.prog_type = load_attr->prog_type; 344 p.expected_attach_type = load_attr->expected_attach_type; 345 switch (p.prog_type) { 346 case BPF_PROG_TYPE_STRUCT_OPS: 347 case BPF_PROG_TYPE_LSM: 348 p.attach_btf_id = load_attr->attach_btf_id; 349 break; 350 case BPF_PROG_TYPE_TRACING: 351 case BPF_PROG_TYPE_EXT: 352 p.attach_btf_id = load_attr->attach_btf_id; 353 p.attach_prog_fd = load_attr->attach_prog_fd; 354 break; 355 default: 356 p.prog_ifindex = load_attr->prog_ifindex; 357 p.kern_version = load_attr->kern_version; 358 } 359 p.insn_cnt = load_attr->insns_cnt; 360 p.insns = load_attr->insns; 361 p.license = load_attr->license; 362 p.log_level = load_attr->log_level; 363 p.log_buf = log_buf; 364 p.log_buf_sz = log_buf_sz; 365 p.prog_btf_fd = load_attr->prog_btf_fd; 366 p.func_info_rec_size = load_attr->func_info_rec_size; 367 p.func_info_cnt = load_attr->func_info_cnt; 368 p.func_info = load_attr->func_info; 369 p.line_info_rec_size = load_attr->line_info_rec_size; 370 p.line_info_cnt = load_attr->line_info_cnt; 371 p.line_info = load_attr->line_info; 372 p.name = load_attr->name; 373 p.prog_flags = load_attr->prog_flags; 374 375 return libbpf__bpf_prog_load(&p); 376 } 377 378 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 379 size_t insns_cnt, const char *license, 380 __u32 kern_version, char *log_buf, 381 size_t log_buf_sz) 382 { 383 struct bpf_load_program_attr load_attr; 384 385 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 386 load_attr.prog_type = type; 387 load_attr.expected_attach_type = 0; 388 load_attr.name = NULL; 389 load_attr.insns = insns; 390 load_attr.insns_cnt = insns_cnt; 391 load_attr.license = license; 392 load_attr.kern_version = kern_version; 393 394 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 395 } 396 397 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 398 size_t insns_cnt, __u32 prog_flags, const char *license, 399 __u32 kern_version, char *log_buf, size_t log_buf_sz, 400 int log_level) 401 { 402 union bpf_attr attr; 403 int fd; 404 405 memset(&attr, 0, sizeof(attr)); 406 attr.prog_type = type; 407 attr.insn_cnt = (__u32)insns_cnt; 408 attr.insns = ptr_to_u64(insns); 409 attr.license = ptr_to_u64(license); 410 attr.log_buf = ptr_to_u64(log_buf); 411 attr.log_size = log_buf_sz; 412 attr.log_level = log_level; 413 log_buf[0] = 0; 414 attr.kern_version = kern_version; 415 attr.prog_flags = prog_flags; 416 417 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 418 return libbpf_err_errno(fd); 419 } 420 421 int bpf_map_update_elem(int fd, const void *key, const void *value, 422 __u64 flags) 423 { 424 union bpf_attr attr; 425 int ret; 426 427 memset(&attr, 0, sizeof(attr)); 428 attr.map_fd = fd; 429 attr.key = ptr_to_u64(key); 430 attr.value = ptr_to_u64(value); 431 attr.flags = flags; 432 433 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 434 return libbpf_err_errno(ret); 435 } 436 437 int bpf_map_lookup_elem(int fd, const void *key, void *value) 438 { 439 union bpf_attr attr; 440 int ret; 441 442 memset(&attr, 0, sizeof(attr)); 443 attr.map_fd = fd; 444 attr.key = ptr_to_u64(key); 445 attr.value = ptr_to_u64(value); 446 447 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 448 return libbpf_err_errno(ret); 449 } 450 451 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 452 { 453 union bpf_attr attr; 454 int ret; 455 456 memset(&attr, 0, sizeof(attr)); 457 attr.map_fd = fd; 458 attr.key = ptr_to_u64(key); 459 attr.value = ptr_to_u64(value); 460 attr.flags = flags; 461 462 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 463 return libbpf_err_errno(ret); 464 } 465 466 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 467 { 468 union bpf_attr attr; 469 int ret; 470 471 memset(&attr, 0, sizeof(attr)); 472 attr.map_fd = fd; 473 attr.key = ptr_to_u64(key); 474 attr.value = ptr_to_u64(value); 475 476 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 477 return libbpf_err_errno(ret); 478 } 479 480 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags) 481 { 482 union bpf_attr attr; 483 484 memset(&attr, 0, sizeof(attr)); 485 attr.map_fd = fd; 486 attr.key = ptr_to_u64(key); 487 attr.value = ptr_to_u64(value); 488 attr.flags = flags; 489 490 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 491 } 492 493 int bpf_map_delete_elem(int fd, const void *key) 494 { 495 union bpf_attr attr; 496 int ret; 497 498 memset(&attr, 0, sizeof(attr)); 499 attr.map_fd = fd; 500 attr.key = ptr_to_u64(key); 501 502 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 503 return libbpf_err_errno(ret); 504 } 505 506 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 507 { 508 union bpf_attr attr; 509 int ret; 510 511 memset(&attr, 0, sizeof(attr)); 512 attr.map_fd = fd; 513 attr.key = ptr_to_u64(key); 514 attr.next_key = ptr_to_u64(next_key); 515 516 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 517 return libbpf_err_errno(ret); 518 } 519 520 int bpf_map_freeze(int fd) 521 { 522 union bpf_attr attr; 523 int ret; 524 525 memset(&attr, 0, sizeof(attr)); 526 attr.map_fd = fd; 527 528 ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 529 return libbpf_err_errno(ret); 530 } 531 532 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 533 void *out_batch, void *keys, void *values, 534 __u32 *count, 535 const struct bpf_map_batch_opts *opts) 536 { 537 union bpf_attr attr; 538 int ret; 539 540 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 541 return libbpf_err(-EINVAL); 542 543 memset(&attr, 0, sizeof(attr)); 544 attr.batch.map_fd = fd; 545 attr.batch.in_batch = ptr_to_u64(in_batch); 546 attr.batch.out_batch = ptr_to_u64(out_batch); 547 attr.batch.keys = ptr_to_u64(keys); 548 attr.batch.values = ptr_to_u64(values); 549 attr.batch.count = *count; 550 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 551 attr.batch.flags = OPTS_GET(opts, flags, 0); 552 553 ret = sys_bpf(cmd, &attr, sizeof(attr)); 554 *count = attr.batch.count; 555 556 return libbpf_err_errno(ret); 557 } 558 559 int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 560 const struct bpf_map_batch_opts *opts) 561 { 562 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 563 NULL, keys, NULL, count, opts); 564 } 565 566 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 567 void *values, __u32 *count, 568 const struct bpf_map_batch_opts *opts) 569 { 570 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 571 out_batch, keys, values, count, opts); 572 } 573 574 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 575 void *keys, void *values, __u32 *count, 576 const struct bpf_map_batch_opts *opts) 577 { 578 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 579 fd, in_batch, out_batch, keys, values, 580 count, opts); 581 } 582 583 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 584 const struct bpf_map_batch_opts *opts) 585 { 586 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 587 keys, values, count, opts); 588 } 589 590 int bpf_obj_pin(int fd, const char *pathname) 591 { 592 union bpf_attr attr; 593 int ret; 594 595 memset(&attr, 0, sizeof(attr)); 596 attr.pathname = ptr_to_u64((void *)pathname); 597 attr.bpf_fd = fd; 598 599 ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 600 return libbpf_err_errno(ret); 601 } 602 603 int bpf_obj_get(const char *pathname) 604 { 605 union bpf_attr attr; 606 int fd; 607 608 memset(&attr, 0, sizeof(attr)); 609 attr.pathname = ptr_to_u64((void *)pathname); 610 611 fd = sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 612 return libbpf_err_errno(fd); 613 } 614 615 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 616 unsigned int flags) 617 { 618 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 619 .flags = flags, 620 ); 621 622 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 623 } 624 625 int bpf_prog_attach_xattr(int prog_fd, int target_fd, 626 enum bpf_attach_type type, 627 const struct bpf_prog_attach_opts *opts) 628 { 629 union bpf_attr attr; 630 int ret; 631 632 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 633 return libbpf_err(-EINVAL); 634 635 memset(&attr, 0, sizeof(attr)); 636 attr.target_fd = target_fd; 637 attr.attach_bpf_fd = prog_fd; 638 attr.attach_type = type; 639 attr.attach_flags = OPTS_GET(opts, flags, 0); 640 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 641 642 ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 643 return libbpf_err_errno(ret); 644 } 645 646 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 647 { 648 union bpf_attr attr; 649 int ret; 650 651 memset(&attr, 0, sizeof(attr)); 652 attr.target_fd = target_fd; 653 attr.attach_type = type; 654 655 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 656 return libbpf_err_errno(ret); 657 } 658 659 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 660 { 661 union bpf_attr attr; 662 int ret; 663 664 memset(&attr, 0, sizeof(attr)); 665 attr.target_fd = target_fd; 666 attr.attach_bpf_fd = prog_fd; 667 attr.attach_type = type; 668 669 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 670 return libbpf_err_errno(ret); 671 } 672 673 int bpf_link_create(int prog_fd, int target_fd, 674 enum bpf_attach_type attach_type, 675 const struct bpf_link_create_opts *opts) 676 { 677 __u32 target_btf_id, iter_info_len; 678 union bpf_attr attr; 679 int fd; 680 681 if (!OPTS_VALID(opts, bpf_link_create_opts)) 682 return libbpf_err(-EINVAL); 683 684 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 685 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 686 687 /* validate we don't have unexpected combinations of non-zero fields */ 688 if (iter_info_len || target_btf_id) { 689 if (iter_info_len && target_btf_id) 690 return libbpf_err(-EINVAL); 691 if (!OPTS_ZEROED(opts, target_btf_id)) 692 return libbpf_err(-EINVAL); 693 } 694 695 memset(&attr, 0, sizeof(attr)); 696 attr.link_create.prog_fd = prog_fd; 697 attr.link_create.target_fd = target_fd; 698 attr.link_create.attach_type = attach_type; 699 attr.link_create.flags = OPTS_GET(opts, flags, 0); 700 701 if (target_btf_id) { 702 attr.link_create.target_btf_id = target_btf_id; 703 goto proceed; 704 } 705 706 switch (attach_type) { 707 case BPF_TRACE_ITER: 708 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 709 attr.link_create.iter_info_len = iter_info_len; 710 break; 711 case BPF_PERF_EVENT: 712 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0); 713 if (!OPTS_ZEROED(opts, perf_event)) 714 return libbpf_err(-EINVAL); 715 break; 716 default: 717 if (!OPTS_ZEROED(opts, flags)) 718 return libbpf_err(-EINVAL); 719 break; 720 } 721 proceed: 722 fd = sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr)); 723 return libbpf_err_errno(fd); 724 } 725 726 int bpf_link_detach(int link_fd) 727 { 728 union bpf_attr attr; 729 int ret; 730 731 memset(&attr, 0, sizeof(attr)); 732 attr.link_detach.link_fd = link_fd; 733 734 ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr)); 735 return libbpf_err_errno(ret); 736 } 737 738 int bpf_link_update(int link_fd, int new_prog_fd, 739 const struct bpf_link_update_opts *opts) 740 { 741 union bpf_attr attr; 742 int ret; 743 744 if (!OPTS_VALID(opts, bpf_link_update_opts)) 745 return libbpf_err(-EINVAL); 746 747 memset(&attr, 0, sizeof(attr)); 748 attr.link_update.link_fd = link_fd; 749 attr.link_update.new_prog_fd = new_prog_fd; 750 attr.link_update.flags = OPTS_GET(opts, flags, 0); 751 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 752 753 ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr)); 754 return libbpf_err_errno(ret); 755 } 756 757 int bpf_iter_create(int link_fd) 758 { 759 union bpf_attr attr; 760 int fd; 761 762 memset(&attr, 0, sizeof(attr)); 763 attr.iter_create.link_fd = link_fd; 764 765 fd = sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr)); 766 return libbpf_err_errno(fd); 767 } 768 769 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 770 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 771 { 772 union bpf_attr attr; 773 int ret; 774 775 memset(&attr, 0, sizeof(attr)); 776 attr.query.target_fd = target_fd; 777 attr.query.attach_type = type; 778 attr.query.query_flags = query_flags; 779 attr.query.prog_cnt = *prog_cnt; 780 attr.query.prog_ids = ptr_to_u64(prog_ids); 781 782 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 783 784 if (attach_flags) 785 *attach_flags = attr.query.attach_flags; 786 *prog_cnt = attr.query.prog_cnt; 787 788 return libbpf_err_errno(ret); 789 } 790 791 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 792 void *data_out, __u32 *size_out, __u32 *retval, 793 __u32 *duration) 794 { 795 union bpf_attr attr; 796 int ret; 797 798 memset(&attr, 0, sizeof(attr)); 799 attr.test.prog_fd = prog_fd; 800 attr.test.data_in = ptr_to_u64(data); 801 attr.test.data_out = ptr_to_u64(data_out); 802 attr.test.data_size_in = size; 803 attr.test.repeat = repeat; 804 805 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 806 807 if (size_out) 808 *size_out = attr.test.data_size_out; 809 if (retval) 810 *retval = attr.test.retval; 811 if (duration) 812 *duration = attr.test.duration; 813 814 return libbpf_err_errno(ret); 815 } 816 817 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 818 { 819 union bpf_attr attr; 820 int ret; 821 822 if (!test_attr->data_out && test_attr->data_size_out > 0) 823 return libbpf_err(-EINVAL); 824 825 memset(&attr, 0, sizeof(attr)); 826 attr.test.prog_fd = test_attr->prog_fd; 827 attr.test.data_in = ptr_to_u64(test_attr->data_in); 828 attr.test.data_out = ptr_to_u64(test_attr->data_out); 829 attr.test.data_size_in = test_attr->data_size_in; 830 attr.test.data_size_out = test_attr->data_size_out; 831 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 832 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 833 attr.test.ctx_size_in = test_attr->ctx_size_in; 834 attr.test.ctx_size_out = test_attr->ctx_size_out; 835 attr.test.repeat = test_attr->repeat; 836 837 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 838 839 test_attr->data_size_out = attr.test.data_size_out; 840 test_attr->ctx_size_out = attr.test.ctx_size_out; 841 test_attr->retval = attr.test.retval; 842 test_attr->duration = attr.test.duration; 843 844 return libbpf_err_errno(ret); 845 } 846 847 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 848 { 849 union bpf_attr attr; 850 int ret; 851 852 if (!OPTS_VALID(opts, bpf_test_run_opts)) 853 return libbpf_err(-EINVAL); 854 855 memset(&attr, 0, sizeof(attr)); 856 attr.test.prog_fd = prog_fd; 857 attr.test.cpu = OPTS_GET(opts, cpu, 0); 858 attr.test.flags = OPTS_GET(opts, flags, 0); 859 attr.test.repeat = OPTS_GET(opts, repeat, 0); 860 attr.test.duration = OPTS_GET(opts, duration, 0); 861 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 862 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 863 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 864 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 865 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 866 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 867 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 868 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 869 870 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 871 872 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 873 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 874 OPTS_SET(opts, duration, attr.test.duration); 875 OPTS_SET(opts, retval, attr.test.retval); 876 877 return libbpf_err_errno(ret); 878 } 879 880 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 881 { 882 union bpf_attr attr; 883 int err; 884 885 memset(&attr, 0, sizeof(attr)); 886 attr.start_id = start_id; 887 888 err = sys_bpf(cmd, &attr, sizeof(attr)); 889 if (!err) 890 *next_id = attr.next_id; 891 892 return libbpf_err_errno(err); 893 } 894 895 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 896 { 897 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 898 } 899 900 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 901 { 902 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 903 } 904 905 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 906 { 907 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 908 } 909 910 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 911 { 912 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 913 } 914 915 int bpf_prog_get_fd_by_id(__u32 id) 916 { 917 union bpf_attr attr; 918 int fd; 919 920 memset(&attr, 0, sizeof(attr)); 921 attr.prog_id = id; 922 923 fd = sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 924 return libbpf_err_errno(fd); 925 } 926 927 int bpf_map_get_fd_by_id(__u32 id) 928 { 929 union bpf_attr attr; 930 int fd; 931 932 memset(&attr, 0, sizeof(attr)); 933 attr.map_id = id; 934 935 fd = sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 936 return libbpf_err_errno(fd); 937 } 938 939 int bpf_btf_get_fd_by_id(__u32 id) 940 { 941 union bpf_attr attr; 942 int fd; 943 944 memset(&attr, 0, sizeof(attr)); 945 attr.btf_id = id; 946 947 fd = sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 948 return libbpf_err_errno(fd); 949 } 950 951 int bpf_link_get_fd_by_id(__u32 id) 952 { 953 union bpf_attr attr; 954 int fd; 955 956 memset(&attr, 0, sizeof(attr)); 957 attr.link_id = id; 958 959 fd = sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr)); 960 return libbpf_err_errno(fd); 961 } 962 963 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 964 { 965 union bpf_attr attr; 966 int err; 967 968 memset(&attr, 0, sizeof(attr)); 969 attr.info.bpf_fd = bpf_fd; 970 attr.info.info_len = *info_len; 971 attr.info.info = ptr_to_u64(info); 972 973 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 974 975 if (!err) 976 *info_len = attr.info.info_len; 977 978 return libbpf_err_errno(err); 979 } 980 981 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 982 { 983 union bpf_attr attr; 984 int fd; 985 986 memset(&attr, 0, sizeof(attr)); 987 attr.raw_tracepoint.name = ptr_to_u64(name); 988 attr.raw_tracepoint.prog_fd = prog_fd; 989 990 fd = sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 991 return libbpf_err_errno(fd); 992 } 993 994 int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 995 bool do_log) 996 { 997 union bpf_attr attr = {}; 998 int fd; 999 1000 attr.btf = ptr_to_u64(btf); 1001 attr.btf_size = btf_size; 1002 1003 retry: 1004 if (do_log && log_buf && log_buf_size) { 1005 attr.btf_log_level = 1; 1006 attr.btf_log_size = log_buf_size; 1007 attr.btf_log_buf = ptr_to_u64(log_buf); 1008 } 1009 1010 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 1011 1012 if (fd < 0 && !do_log && log_buf && log_buf_size) { 1013 do_log = true; 1014 goto retry; 1015 } 1016 1017 return libbpf_err_errno(fd); 1018 } 1019 1020 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 1021 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 1022 __u64 *probe_addr) 1023 { 1024 union bpf_attr attr = {}; 1025 int err; 1026 1027 attr.task_fd_query.pid = pid; 1028 attr.task_fd_query.fd = fd; 1029 attr.task_fd_query.flags = flags; 1030 attr.task_fd_query.buf = ptr_to_u64(buf); 1031 attr.task_fd_query.buf_len = *buf_len; 1032 1033 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 1034 1035 *buf_len = attr.task_fd_query.buf_len; 1036 *prog_id = attr.task_fd_query.prog_id; 1037 *fd_type = attr.task_fd_query.fd_type; 1038 *probe_offset = attr.task_fd_query.probe_offset; 1039 *probe_addr = attr.task_fd_query.probe_addr; 1040 1041 return libbpf_err_errno(err); 1042 } 1043 1044 int bpf_enable_stats(enum bpf_stats_type type) 1045 { 1046 union bpf_attr attr; 1047 int fd; 1048 1049 memset(&attr, 0, sizeof(attr)); 1050 attr.enable_stats.type = type; 1051 1052 fd = sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr)); 1053 return libbpf_err_errno(fd); 1054 } 1055 1056 int bpf_prog_bind_map(int prog_fd, int map_fd, 1057 const struct bpf_prog_bind_opts *opts) 1058 { 1059 union bpf_attr attr; 1060 int ret; 1061 1062 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 1063 return libbpf_err(-EINVAL); 1064 1065 memset(&attr, 0, sizeof(attr)); 1066 attr.prog_bind_map.prog_fd = prog_fd; 1067 attr.prog_bind_map.map_fd = map_fd; 1068 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 1069 1070 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr)); 1071 return libbpf_err_errno(ret); 1072 } 1073