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_fd(enum bpf_cmd cmd, union bpf_attr *attr, 69 unsigned int size) 70 { 71 int fd; 72 73 fd = sys_bpf(cmd, attr, size); 74 return ensure_good_fd(fd); 75 } 76 77 static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size) 78 { 79 int retries = 5; 80 int fd; 81 82 do { 83 fd = sys_bpf_fd(BPF_PROG_LOAD, attr, size); 84 } while (fd < 0 && errno == EAGAIN && retries-- > 0); 85 86 return fd; 87 } 88 89 int libbpf__bpf_create_map_xattr(const struct bpf_create_map_params *create_attr) 90 { 91 union bpf_attr attr; 92 int fd; 93 94 memset(&attr, '\0', sizeof(attr)); 95 96 attr.map_type = create_attr->map_type; 97 attr.key_size = create_attr->key_size; 98 attr.value_size = create_attr->value_size; 99 attr.max_entries = create_attr->max_entries; 100 attr.map_flags = create_attr->map_flags; 101 if (create_attr->name) 102 memcpy(attr.map_name, create_attr->name, 103 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1)); 104 attr.numa_node = create_attr->numa_node; 105 attr.btf_fd = create_attr->btf_fd; 106 attr.btf_key_type_id = create_attr->btf_key_type_id; 107 attr.btf_value_type_id = create_attr->btf_value_type_id; 108 attr.map_ifindex = create_attr->map_ifindex; 109 if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS) 110 attr.btf_vmlinux_value_type_id = 111 create_attr->btf_vmlinux_value_type_id; 112 else 113 attr.inner_map_fd = create_attr->inner_map_fd; 114 attr.map_extra = create_attr->map_extra; 115 116 fd = sys_bpf_fd(BPF_MAP_CREATE, &attr, sizeof(attr)); 117 return libbpf_err_errno(fd); 118 } 119 120 int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) 121 { 122 struct bpf_create_map_params p = {}; 123 124 p.map_type = create_attr->map_type; 125 p.key_size = create_attr->key_size; 126 p.value_size = create_attr->value_size; 127 p.max_entries = create_attr->max_entries; 128 p.map_flags = create_attr->map_flags; 129 p.name = create_attr->name; 130 p.numa_node = create_attr->numa_node; 131 p.btf_fd = create_attr->btf_fd; 132 p.btf_key_type_id = create_attr->btf_key_type_id; 133 p.btf_value_type_id = create_attr->btf_value_type_id; 134 p.map_ifindex = create_attr->map_ifindex; 135 if (p.map_type == BPF_MAP_TYPE_STRUCT_OPS) 136 p.btf_vmlinux_value_type_id = 137 create_attr->btf_vmlinux_value_type_id; 138 else 139 p.inner_map_fd = create_attr->inner_map_fd; 140 141 return libbpf__bpf_create_map_xattr(&p); 142 } 143 144 int bpf_create_map_node(enum bpf_map_type map_type, const char *name, 145 int key_size, int value_size, int max_entries, 146 __u32 map_flags, int node) 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 if (node >= 0) { 157 map_attr.numa_node = node; 158 map_attr.map_flags |= BPF_F_NUMA_NODE; 159 } 160 161 return bpf_create_map_xattr(&map_attr); 162 } 163 164 int bpf_create_map(enum bpf_map_type map_type, int key_size, 165 int value_size, int max_entries, __u32 map_flags) 166 { 167 struct bpf_create_map_attr map_attr = {}; 168 169 map_attr.map_type = map_type; 170 map_attr.map_flags = map_flags; 171 map_attr.key_size = key_size; 172 map_attr.value_size = value_size; 173 map_attr.max_entries = max_entries; 174 175 return bpf_create_map_xattr(&map_attr); 176 } 177 178 int bpf_create_map_name(enum bpf_map_type map_type, const char *name, 179 int key_size, int value_size, int max_entries, 180 __u32 map_flags) 181 { 182 struct bpf_create_map_attr map_attr = {}; 183 184 map_attr.name = name; 185 map_attr.map_type = map_type; 186 map_attr.map_flags = map_flags; 187 map_attr.key_size = key_size; 188 map_attr.value_size = value_size; 189 map_attr.max_entries = max_entries; 190 191 return bpf_create_map_xattr(&map_attr); 192 } 193 194 int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name, 195 int key_size, int inner_map_fd, int max_entries, 196 __u32 map_flags, int node) 197 { 198 union bpf_attr attr; 199 int fd; 200 201 memset(&attr, '\0', sizeof(attr)); 202 203 attr.map_type = map_type; 204 attr.key_size = key_size; 205 attr.value_size = 4; 206 attr.inner_map_fd = inner_map_fd; 207 attr.max_entries = max_entries; 208 attr.map_flags = map_flags; 209 if (name) 210 memcpy(attr.map_name, name, 211 min(strlen(name), BPF_OBJ_NAME_LEN - 1)); 212 213 if (node >= 0) { 214 attr.map_flags |= BPF_F_NUMA_NODE; 215 attr.numa_node = node; 216 } 217 218 fd = sys_bpf_fd(BPF_MAP_CREATE, &attr, sizeof(attr)); 219 return libbpf_err_errno(fd); 220 } 221 222 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, 223 int key_size, int inner_map_fd, int max_entries, 224 __u32 map_flags) 225 { 226 return bpf_create_map_in_map_node(map_type, name, key_size, 227 inner_map_fd, max_entries, map_flags, 228 -1); 229 } 230 231 static void * 232 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 233 __u32 actual_rec_size, __u32 expected_rec_size) 234 { 235 __u64 info_len = (__u64)actual_rec_size * cnt; 236 void *info, *nrecord; 237 int i; 238 239 info = malloc(info_len); 240 if (!info) 241 return NULL; 242 243 /* zero out bytes kernel does not understand */ 244 nrecord = info; 245 for (i = 0; i < cnt; i++) { 246 memcpy(nrecord, orecord, expected_rec_size); 247 memset(nrecord + expected_rec_size, 0, 248 actual_rec_size - expected_rec_size); 249 orecord += actual_rec_size; 250 nrecord += actual_rec_size; 251 } 252 253 return info; 254 } 255 256 int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 257 { 258 void *finfo = NULL, *linfo = NULL; 259 union bpf_attr attr; 260 int fd; 261 262 if (!load_attr->log_buf != !load_attr->log_buf_sz) 263 return libbpf_err(-EINVAL); 264 265 if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf)) 266 return libbpf_err(-EINVAL); 267 268 memset(&attr, 0, sizeof(attr)); 269 attr.prog_type = load_attr->prog_type; 270 attr.expected_attach_type = load_attr->expected_attach_type; 271 272 if (load_attr->attach_prog_fd) 273 attr.attach_prog_fd = load_attr->attach_prog_fd; 274 else 275 attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd; 276 attr.attach_btf_id = load_attr->attach_btf_id; 277 278 attr.prog_ifindex = load_attr->prog_ifindex; 279 attr.kern_version = load_attr->kern_version; 280 281 attr.insn_cnt = (__u32)load_attr->insn_cnt; 282 attr.insns = ptr_to_u64(load_attr->insns); 283 attr.license = ptr_to_u64(load_attr->license); 284 285 attr.log_level = load_attr->log_level; 286 if (attr.log_level) { 287 attr.log_buf = ptr_to_u64(load_attr->log_buf); 288 attr.log_size = load_attr->log_buf_sz; 289 } 290 291 attr.prog_btf_fd = load_attr->prog_btf_fd; 292 attr.prog_flags = load_attr->prog_flags; 293 294 attr.func_info_rec_size = load_attr->func_info_rec_size; 295 attr.func_info_cnt = load_attr->func_info_cnt; 296 attr.func_info = ptr_to_u64(load_attr->func_info); 297 298 attr.line_info_rec_size = load_attr->line_info_rec_size; 299 attr.line_info_cnt = load_attr->line_info_cnt; 300 attr.line_info = ptr_to_u64(load_attr->line_info); 301 attr.fd_array = ptr_to_u64(load_attr->fd_array); 302 303 if (load_attr->name) 304 memcpy(attr.prog_name, load_attr->name, 305 min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1)); 306 307 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 308 if (fd >= 0) 309 return fd; 310 311 /* After bpf_prog_load, the kernel may modify certain attributes 312 * to give user space a hint how to deal with loading failure. 313 * Check to see whether we can make some changes and load again. 314 */ 315 while (errno == E2BIG && (!finfo || !linfo)) { 316 if (!finfo && attr.func_info_cnt && 317 attr.func_info_rec_size < load_attr->func_info_rec_size) { 318 /* try with corrected func info records */ 319 finfo = alloc_zero_tailing_info(load_attr->func_info, 320 load_attr->func_info_cnt, 321 load_attr->func_info_rec_size, 322 attr.func_info_rec_size); 323 if (!finfo) { 324 errno = E2BIG; 325 goto done; 326 } 327 328 attr.func_info = ptr_to_u64(finfo); 329 attr.func_info_rec_size = load_attr->func_info_rec_size; 330 } else if (!linfo && attr.line_info_cnt && 331 attr.line_info_rec_size < 332 load_attr->line_info_rec_size) { 333 linfo = alloc_zero_tailing_info(load_attr->line_info, 334 load_attr->line_info_cnt, 335 load_attr->line_info_rec_size, 336 attr.line_info_rec_size); 337 if (!linfo) { 338 errno = E2BIG; 339 goto done; 340 } 341 342 attr.line_info = ptr_to_u64(linfo); 343 attr.line_info_rec_size = load_attr->line_info_rec_size; 344 } else { 345 break; 346 } 347 348 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 349 if (fd >= 0) 350 goto done; 351 } 352 353 if (load_attr->log_level || !load_attr->log_buf) 354 goto done; 355 356 /* Try again with log */ 357 attr.log_buf = ptr_to_u64(load_attr->log_buf); 358 attr.log_size = load_attr->log_buf_sz; 359 attr.log_level = 1; 360 load_attr->log_buf[0] = 0; 361 362 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 363 done: 364 /* free() doesn't affect errno, so we don't need to restore it */ 365 free(finfo); 366 free(linfo); 367 return libbpf_err_errno(fd); 368 } 369 370 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 371 char *log_buf, size_t log_buf_sz) 372 { 373 struct bpf_prog_load_params p = {}; 374 375 if (!load_attr || !log_buf != !log_buf_sz) 376 return libbpf_err(-EINVAL); 377 378 p.prog_type = load_attr->prog_type; 379 p.expected_attach_type = load_attr->expected_attach_type; 380 switch (p.prog_type) { 381 case BPF_PROG_TYPE_STRUCT_OPS: 382 case BPF_PROG_TYPE_LSM: 383 p.attach_btf_id = load_attr->attach_btf_id; 384 break; 385 case BPF_PROG_TYPE_TRACING: 386 case BPF_PROG_TYPE_EXT: 387 p.attach_btf_id = load_attr->attach_btf_id; 388 p.attach_prog_fd = load_attr->attach_prog_fd; 389 break; 390 default: 391 p.prog_ifindex = load_attr->prog_ifindex; 392 p.kern_version = load_attr->kern_version; 393 } 394 p.insn_cnt = load_attr->insns_cnt; 395 p.insns = load_attr->insns; 396 p.license = load_attr->license; 397 p.log_level = load_attr->log_level; 398 p.log_buf = log_buf; 399 p.log_buf_sz = log_buf_sz; 400 p.prog_btf_fd = load_attr->prog_btf_fd; 401 p.func_info_rec_size = load_attr->func_info_rec_size; 402 p.func_info_cnt = load_attr->func_info_cnt; 403 p.func_info = load_attr->func_info; 404 p.line_info_rec_size = load_attr->line_info_rec_size; 405 p.line_info_cnt = load_attr->line_info_cnt; 406 p.line_info = load_attr->line_info; 407 p.name = load_attr->name; 408 p.prog_flags = load_attr->prog_flags; 409 410 return libbpf__bpf_prog_load(&p); 411 } 412 413 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 414 size_t insns_cnt, const char *license, 415 __u32 kern_version, char *log_buf, 416 size_t log_buf_sz) 417 { 418 struct bpf_load_program_attr load_attr; 419 420 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 421 load_attr.prog_type = type; 422 load_attr.expected_attach_type = 0; 423 load_attr.name = NULL; 424 load_attr.insns = insns; 425 load_attr.insns_cnt = insns_cnt; 426 load_attr.license = license; 427 load_attr.kern_version = kern_version; 428 429 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 430 } 431 432 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 433 size_t insns_cnt, __u32 prog_flags, const char *license, 434 __u32 kern_version, char *log_buf, size_t log_buf_sz, 435 int log_level) 436 { 437 union bpf_attr attr; 438 int fd; 439 440 memset(&attr, 0, sizeof(attr)); 441 attr.prog_type = type; 442 attr.insn_cnt = (__u32)insns_cnt; 443 attr.insns = ptr_to_u64(insns); 444 attr.license = ptr_to_u64(license); 445 attr.log_buf = ptr_to_u64(log_buf); 446 attr.log_size = log_buf_sz; 447 attr.log_level = log_level; 448 log_buf[0] = 0; 449 attr.kern_version = kern_version; 450 attr.prog_flags = prog_flags; 451 452 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 453 return libbpf_err_errno(fd); 454 } 455 456 int bpf_map_update_elem(int fd, const void *key, const void *value, 457 __u64 flags) 458 { 459 union bpf_attr attr; 460 int ret; 461 462 memset(&attr, 0, sizeof(attr)); 463 attr.map_fd = fd; 464 attr.key = ptr_to_u64(key); 465 attr.value = ptr_to_u64(value); 466 attr.flags = flags; 467 468 ret = sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 469 return libbpf_err_errno(ret); 470 } 471 472 int bpf_map_lookup_elem(int fd, const void *key, void *value) 473 { 474 union bpf_attr attr; 475 int ret; 476 477 memset(&attr, 0, sizeof(attr)); 478 attr.map_fd = fd; 479 attr.key = ptr_to_u64(key); 480 attr.value = ptr_to_u64(value); 481 482 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 483 return libbpf_err_errno(ret); 484 } 485 486 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 487 { 488 union bpf_attr attr; 489 int ret; 490 491 memset(&attr, 0, sizeof(attr)); 492 attr.map_fd = fd; 493 attr.key = ptr_to_u64(key); 494 attr.value = ptr_to_u64(value); 495 attr.flags = flags; 496 497 ret = sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 498 return libbpf_err_errno(ret); 499 } 500 501 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 502 { 503 union bpf_attr attr; 504 int ret; 505 506 memset(&attr, 0, sizeof(attr)); 507 attr.map_fd = fd; 508 attr.key = ptr_to_u64(key); 509 attr.value = ptr_to_u64(value); 510 511 ret = sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 512 return libbpf_err_errno(ret); 513 } 514 515 int bpf_map_lookup_and_delete_elem_flags(int fd, const void *key, void *value, __u64 flags) 516 { 517 union bpf_attr attr; 518 519 memset(&attr, 0, sizeof(attr)); 520 attr.map_fd = fd; 521 attr.key = ptr_to_u64(key); 522 attr.value = ptr_to_u64(value); 523 attr.flags = flags; 524 525 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 526 } 527 528 int bpf_map_delete_elem(int fd, const void *key) 529 { 530 union bpf_attr attr; 531 int ret; 532 533 memset(&attr, 0, sizeof(attr)); 534 attr.map_fd = fd; 535 attr.key = ptr_to_u64(key); 536 537 ret = sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 538 return libbpf_err_errno(ret); 539 } 540 541 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 542 { 543 union bpf_attr attr; 544 int ret; 545 546 memset(&attr, 0, sizeof(attr)); 547 attr.map_fd = fd; 548 attr.key = ptr_to_u64(key); 549 attr.next_key = ptr_to_u64(next_key); 550 551 ret = sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 552 return libbpf_err_errno(ret); 553 } 554 555 int bpf_map_freeze(int fd) 556 { 557 union bpf_attr attr; 558 int ret; 559 560 memset(&attr, 0, sizeof(attr)); 561 attr.map_fd = fd; 562 563 ret = sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 564 return libbpf_err_errno(ret); 565 } 566 567 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 568 void *out_batch, void *keys, void *values, 569 __u32 *count, 570 const struct bpf_map_batch_opts *opts) 571 { 572 union bpf_attr attr; 573 int ret; 574 575 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 576 return libbpf_err(-EINVAL); 577 578 memset(&attr, 0, sizeof(attr)); 579 attr.batch.map_fd = fd; 580 attr.batch.in_batch = ptr_to_u64(in_batch); 581 attr.batch.out_batch = ptr_to_u64(out_batch); 582 attr.batch.keys = ptr_to_u64(keys); 583 attr.batch.values = ptr_to_u64(values); 584 attr.batch.count = *count; 585 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 586 attr.batch.flags = OPTS_GET(opts, flags, 0); 587 588 ret = sys_bpf(cmd, &attr, sizeof(attr)); 589 *count = attr.batch.count; 590 591 return libbpf_err_errno(ret); 592 } 593 594 int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 595 const struct bpf_map_batch_opts *opts) 596 { 597 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 598 NULL, keys, NULL, count, opts); 599 } 600 601 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 602 void *values, __u32 *count, 603 const struct bpf_map_batch_opts *opts) 604 { 605 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 606 out_batch, keys, values, count, opts); 607 } 608 609 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 610 void *keys, void *values, __u32 *count, 611 const struct bpf_map_batch_opts *opts) 612 { 613 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 614 fd, in_batch, out_batch, keys, values, 615 count, opts); 616 } 617 618 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 619 const struct bpf_map_batch_opts *opts) 620 { 621 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 622 keys, values, count, opts); 623 } 624 625 int bpf_obj_pin(int fd, const char *pathname) 626 { 627 union bpf_attr attr; 628 int ret; 629 630 memset(&attr, 0, sizeof(attr)); 631 attr.pathname = ptr_to_u64((void *)pathname); 632 attr.bpf_fd = fd; 633 634 ret = sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 635 return libbpf_err_errno(ret); 636 } 637 638 int bpf_obj_get(const char *pathname) 639 { 640 union bpf_attr attr; 641 int fd; 642 643 memset(&attr, 0, sizeof(attr)); 644 attr.pathname = ptr_to_u64((void *)pathname); 645 646 fd = sys_bpf_fd(BPF_OBJ_GET, &attr, sizeof(attr)); 647 return libbpf_err_errno(fd); 648 } 649 650 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 651 unsigned int flags) 652 { 653 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 654 .flags = flags, 655 ); 656 657 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 658 } 659 660 int bpf_prog_attach_xattr(int prog_fd, int target_fd, 661 enum bpf_attach_type type, 662 const struct bpf_prog_attach_opts *opts) 663 { 664 union bpf_attr attr; 665 int ret; 666 667 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 668 return libbpf_err(-EINVAL); 669 670 memset(&attr, 0, sizeof(attr)); 671 attr.target_fd = target_fd; 672 attr.attach_bpf_fd = prog_fd; 673 attr.attach_type = type; 674 attr.attach_flags = OPTS_GET(opts, flags, 0); 675 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 676 677 ret = sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 678 return libbpf_err_errno(ret); 679 } 680 681 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 682 { 683 union bpf_attr attr; 684 int ret; 685 686 memset(&attr, 0, sizeof(attr)); 687 attr.target_fd = target_fd; 688 attr.attach_type = type; 689 690 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 691 return libbpf_err_errno(ret); 692 } 693 694 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 695 { 696 union bpf_attr attr; 697 int ret; 698 699 memset(&attr, 0, sizeof(attr)); 700 attr.target_fd = target_fd; 701 attr.attach_bpf_fd = prog_fd; 702 attr.attach_type = type; 703 704 ret = sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 705 return libbpf_err_errno(ret); 706 } 707 708 int bpf_link_create(int prog_fd, int target_fd, 709 enum bpf_attach_type attach_type, 710 const struct bpf_link_create_opts *opts) 711 { 712 __u32 target_btf_id, iter_info_len; 713 union bpf_attr attr; 714 int fd; 715 716 if (!OPTS_VALID(opts, bpf_link_create_opts)) 717 return libbpf_err(-EINVAL); 718 719 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 720 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 721 722 /* validate we don't have unexpected combinations of non-zero fields */ 723 if (iter_info_len || target_btf_id) { 724 if (iter_info_len && target_btf_id) 725 return libbpf_err(-EINVAL); 726 if (!OPTS_ZEROED(opts, target_btf_id)) 727 return libbpf_err(-EINVAL); 728 } 729 730 memset(&attr, 0, sizeof(attr)); 731 attr.link_create.prog_fd = prog_fd; 732 attr.link_create.target_fd = target_fd; 733 attr.link_create.attach_type = attach_type; 734 attr.link_create.flags = OPTS_GET(opts, flags, 0); 735 736 if (target_btf_id) { 737 attr.link_create.target_btf_id = target_btf_id; 738 goto proceed; 739 } 740 741 switch (attach_type) { 742 case BPF_TRACE_ITER: 743 attr.link_create.iter_info = ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 744 attr.link_create.iter_info_len = iter_info_len; 745 break; 746 case BPF_PERF_EVENT: 747 attr.link_create.perf_event.bpf_cookie = OPTS_GET(opts, perf_event.bpf_cookie, 0); 748 if (!OPTS_ZEROED(opts, perf_event)) 749 return libbpf_err(-EINVAL); 750 break; 751 default: 752 if (!OPTS_ZEROED(opts, flags)) 753 return libbpf_err(-EINVAL); 754 break; 755 } 756 proceed: 757 fd = sys_bpf_fd(BPF_LINK_CREATE, &attr, sizeof(attr)); 758 return libbpf_err_errno(fd); 759 } 760 761 int bpf_link_detach(int link_fd) 762 { 763 union bpf_attr attr; 764 int ret; 765 766 memset(&attr, 0, sizeof(attr)); 767 attr.link_detach.link_fd = link_fd; 768 769 ret = sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr)); 770 return libbpf_err_errno(ret); 771 } 772 773 int bpf_link_update(int link_fd, int new_prog_fd, 774 const struct bpf_link_update_opts *opts) 775 { 776 union bpf_attr attr; 777 int ret; 778 779 if (!OPTS_VALID(opts, bpf_link_update_opts)) 780 return libbpf_err(-EINVAL); 781 782 memset(&attr, 0, sizeof(attr)); 783 attr.link_update.link_fd = link_fd; 784 attr.link_update.new_prog_fd = new_prog_fd; 785 attr.link_update.flags = OPTS_GET(opts, flags, 0); 786 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 787 788 ret = sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr)); 789 return libbpf_err_errno(ret); 790 } 791 792 int bpf_iter_create(int link_fd) 793 { 794 union bpf_attr attr; 795 int fd; 796 797 memset(&attr, 0, sizeof(attr)); 798 attr.iter_create.link_fd = link_fd; 799 800 fd = sys_bpf_fd(BPF_ITER_CREATE, &attr, sizeof(attr)); 801 return libbpf_err_errno(fd); 802 } 803 804 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 805 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 806 { 807 union bpf_attr attr; 808 int ret; 809 810 memset(&attr, 0, sizeof(attr)); 811 attr.query.target_fd = target_fd; 812 attr.query.attach_type = type; 813 attr.query.query_flags = query_flags; 814 attr.query.prog_cnt = *prog_cnt; 815 attr.query.prog_ids = ptr_to_u64(prog_ids); 816 817 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 818 819 if (attach_flags) 820 *attach_flags = attr.query.attach_flags; 821 *prog_cnt = attr.query.prog_cnt; 822 823 return libbpf_err_errno(ret); 824 } 825 826 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 827 void *data_out, __u32 *size_out, __u32 *retval, 828 __u32 *duration) 829 { 830 union bpf_attr attr; 831 int ret; 832 833 memset(&attr, 0, sizeof(attr)); 834 attr.test.prog_fd = prog_fd; 835 attr.test.data_in = ptr_to_u64(data); 836 attr.test.data_out = ptr_to_u64(data_out); 837 attr.test.data_size_in = size; 838 attr.test.repeat = repeat; 839 840 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 841 842 if (size_out) 843 *size_out = attr.test.data_size_out; 844 if (retval) 845 *retval = attr.test.retval; 846 if (duration) 847 *duration = attr.test.duration; 848 849 return libbpf_err_errno(ret); 850 } 851 852 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 853 { 854 union bpf_attr attr; 855 int ret; 856 857 if (!test_attr->data_out && test_attr->data_size_out > 0) 858 return libbpf_err(-EINVAL); 859 860 memset(&attr, 0, sizeof(attr)); 861 attr.test.prog_fd = test_attr->prog_fd; 862 attr.test.data_in = ptr_to_u64(test_attr->data_in); 863 attr.test.data_out = ptr_to_u64(test_attr->data_out); 864 attr.test.data_size_in = test_attr->data_size_in; 865 attr.test.data_size_out = test_attr->data_size_out; 866 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 867 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 868 attr.test.ctx_size_in = test_attr->ctx_size_in; 869 attr.test.ctx_size_out = test_attr->ctx_size_out; 870 attr.test.repeat = test_attr->repeat; 871 872 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 873 874 test_attr->data_size_out = attr.test.data_size_out; 875 test_attr->ctx_size_out = attr.test.ctx_size_out; 876 test_attr->retval = attr.test.retval; 877 test_attr->duration = attr.test.duration; 878 879 return libbpf_err_errno(ret); 880 } 881 882 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 883 { 884 union bpf_attr attr; 885 int ret; 886 887 if (!OPTS_VALID(opts, bpf_test_run_opts)) 888 return libbpf_err(-EINVAL); 889 890 memset(&attr, 0, sizeof(attr)); 891 attr.test.prog_fd = prog_fd; 892 attr.test.cpu = OPTS_GET(opts, cpu, 0); 893 attr.test.flags = OPTS_GET(opts, flags, 0); 894 attr.test.repeat = OPTS_GET(opts, repeat, 0); 895 attr.test.duration = OPTS_GET(opts, duration, 0); 896 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 897 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 898 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 899 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 900 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 901 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 902 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 903 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 904 905 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 906 907 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 908 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 909 OPTS_SET(opts, duration, attr.test.duration); 910 OPTS_SET(opts, retval, attr.test.retval); 911 912 return libbpf_err_errno(ret); 913 } 914 915 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 916 { 917 union bpf_attr attr; 918 int err; 919 920 memset(&attr, 0, sizeof(attr)); 921 attr.start_id = start_id; 922 923 err = sys_bpf(cmd, &attr, sizeof(attr)); 924 if (!err) 925 *next_id = attr.next_id; 926 927 return libbpf_err_errno(err); 928 } 929 930 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 931 { 932 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 933 } 934 935 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 936 { 937 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 938 } 939 940 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 941 { 942 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 943 } 944 945 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 946 { 947 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 948 } 949 950 int bpf_prog_get_fd_by_id(__u32 id) 951 { 952 union bpf_attr attr; 953 int fd; 954 955 memset(&attr, 0, sizeof(attr)); 956 attr.prog_id = id; 957 958 fd = sys_bpf_fd(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 959 return libbpf_err_errno(fd); 960 } 961 962 int bpf_map_get_fd_by_id(__u32 id) 963 { 964 union bpf_attr attr; 965 int fd; 966 967 memset(&attr, 0, sizeof(attr)); 968 attr.map_id = id; 969 970 fd = sys_bpf_fd(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 971 return libbpf_err_errno(fd); 972 } 973 974 int bpf_btf_get_fd_by_id(__u32 id) 975 { 976 union bpf_attr attr; 977 int fd; 978 979 memset(&attr, 0, sizeof(attr)); 980 attr.btf_id = id; 981 982 fd = sys_bpf_fd(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 983 return libbpf_err_errno(fd); 984 } 985 986 int bpf_link_get_fd_by_id(__u32 id) 987 { 988 union bpf_attr attr; 989 int fd; 990 991 memset(&attr, 0, sizeof(attr)); 992 attr.link_id = id; 993 994 fd = sys_bpf_fd(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr)); 995 return libbpf_err_errno(fd); 996 } 997 998 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 999 { 1000 union bpf_attr attr; 1001 int err; 1002 1003 memset(&attr, 0, sizeof(attr)); 1004 attr.info.bpf_fd = bpf_fd; 1005 attr.info.info_len = *info_len; 1006 attr.info.info = ptr_to_u64(info); 1007 1008 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 1009 1010 if (!err) 1011 *info_len = attr.info.info_len; 1012 1013 return libbpf_err_errno(err); 1014 } 1015 1016 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 1017 { 1018 union bpf_attr attr; 1019 int fd; 1020 1021 memset(&attr, 0, sizeof(attr)); 1022 attr.raw_tracepoint.name = ptr_to_u64(name); 1023 attr.raw_tracepoint.prog_fd = prog_fd; 1024 1025 fd = sys_bpf_fd(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 1026 return libbpf_err_errno(fd); 1027 } 1028 1029 int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 1030 bool do_log) 1031 { 1032 union bpf_attr attr = {}; 1033 int fd; 1034 1035 attr.btf = ptr_to_u64(btf); 1036 attr.btf_size = btf_size; 1037 1038 retry: 1039 if (do_log && log_buf && log_buf_size) { 1040 attr.btf_log_level = 1; 1041 attr.btf_log_size = log_buf_size; 1042 attr.btf_log_buf = ptr_to_u64(log_buf); 1043 } 1044 1045 fd = sys_bpf_fd(BPF_BTF_LOAD, &attr, sizeof(attr)); 1046 1047 if (fd < 0 && !do_log && log_buf && log_buf_size) { 1048 do_log = true; 1049 goto retry; 1050 } 1051 1052 return libbpf_err_errno(fd); 1053 } 1054 1055 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 1056 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 1057 __u64 *probe_addr) 1058 { 1059 union bpf_attr attr = {}; 1060 int err; 1061 1062 attr.task_fd_query.pid = pid; 1063 attr.task_fd_query.fd = fd; 1064 attr.task_fd_query.flags = flags; 1065 attr.task_fd_query.buf = ptr_to_u64(buf); 1066 attr.task_fd_query.buf_len = *buf_len; 1067 1068 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 1069 1070 *buf_len = attr.task_fd_query.buf_len; 1071 *prog_id = attr.task_fd_query.prog_id; 1072 *fd_type = attr.task_fd_query.fd_type; 1073 *probe_offset = attr.task_fd_query.probe_offset; 1074 *probe_addr = attr.task_fd_query.probe_addr; 1075 1076 return libbpf_err_errno(err); 1077 } 1078 1079 int bpf_enable_stats(enum bpf_stats_type type) 1080 { 1081 union bpf_attr attr; 1082 int fd; 1083 1084 memset(&attr, 0, sizeof(attr)); 1085 attr.enable_stats.type = type; 1086 1087 fd = sys_bpf_fd(BPF_ENABLE_STATS, &attr, sizeof(attr)); 1088 return libbpf_err_errno(fd); 1089 } 1090 1091 int bpf_prog_bind_map(int prog_fd, int map_fd, 1092 const struct bpf_prog_bind_opts *opts) 1093 { 1094 union bpf_attr attr; 1095 int ret; 1096 1097 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 1098 return libbpf_err(-EINVAL); 1099 1100 memset(&attr, 0, sizeof(attr)); 1101 attr.prog_bind_map.prog_fd = prog_fd; 1102 attr.prog_bind_map.map_fd = map_fd; 1103 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 1104 1105 ret = sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr)); 1106 return libbpf_err_errno(ret); 1107 } 1108