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 84 memset(&attr, '\0', sizeof(attr)); 85 86 attr.map_type = create_attr->map_type; 87 attr.key_size = create_attr->key_size; 88 attr.value_size = create_attr->value_size; 89 attr.max_entries = create_attr->max_entries; 90 attr.map_flags = create_attr->map_flags; 91 if (create_attr->name) 92 memcpy(attr.map_name, create_attr->name, 93 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1)); 94 attr.numa_node = create_attr->numa_node; 95 attr.btf_fd = create_attr->btf_fd; 96 attr.btf_key_type_id = create_attr->btf_key_type_id; 97 attr.btf_value_type_id = create_attr->btf_value_type_id; 98 attr.map_ifindex = create_attr->map_ifindex; 99 if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS) 100 attr.btf_vmlinux_value_type_id = 101 create_attr->btf_vmlinux_value_type_id; 102 else 103 attr.inner_map_fd = create_attr->inner_map_fd; 104 105 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 106 } 107 108 int bpf_create_map_node(enum bpf_map_type map_type, const char *name, 109 int key_size, int value_size, int max_entries, 110 __u32 map_flags, int node) 111 { 112 struct bpf_create_map_attr map_attr = {}; 113 114 map_attr.name = name; 115 map_attr.map_type = map_type; 116 map_attr.map_flags = map_flags; 117 map_attr.key_size = key_size; 118 map_attr.value_size = value_size; 119 map_attr.max_entries = max_entries; 120 if (node >= 0) { 121 map_attr.numa_node = node; 122 map_attr.map_flags |= BPF_F_NUMA_NODE; 123 } 124 125 return bpf_create_map_xattr(&map_attr); 126 } 127 128 int bpf_create_map(enum bpf_map_type map_type, int key_size, 129 int value_size, int max_entries, __u32 map_flags) 130 { 131 struct bpf_create_map_attr map_attr = {}; 132 133 map_attr.map_type = map_type; 134 map_attr.map_flags = map_flags; 135 map_attr.key_size = key_size; 136 map_attr.value_size = value_size; 137 map_attr.max_entries = max_entries; 138 139 return bpf_create_map_xattr(&map_attr); 140 } 141 142 int bpf_create_map_name(enum bpf_map_type map_type, const char *name, 143 int key_size, int value_size, int max_entries, 144 __u32 map_flags) 145 { 146 struct bpf_create_map_attr map_attr = {}; 147 148 map_attr.name = name; 149 map_attr.map_type = map_type; 150 map_attr.map_flags = map_flags; 151 map_attr.key_size = key_size; 152 map_attr.value_size = value_size; 153 map_attr.max_entries = max_entries; 154 155 return bpf_create_map_xattr(&map_attr); 156 } 157 158 int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name, 159 int key_size, int inner_map_fd, int max_entries, 160 __u32 map_flags, int node) 161 { 162 union bpf_attr attr; 163 164 memset(&attr, '\0', sizeof(attr)); 165 166 attr.map_type = map_type; 167 attr.key_size = key_size; 168 attr.value_size = 4; 169 attr.inner_map_fd = inner_map_fd; 170 attr.max_entries = max_entries; 171 attr.map_flags = map_flags; 172 if (name) 173 memcpy(attr.map_name, name, 174 min(strlen(name), BPF_OBJ_NAME_LEN - 1)); 175 176 if (node >= 0) { 177 attr.map_flags |= BPF_F_NUMA_NODE; 178 attr.numa_node = node; 179 } 180 181 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 182 } 183 184 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, 185 int key_size, int inner_map_fd, int max_entries, 186 __u32 map_flags) 187 { 188 return bpf_create_map_in_map_node(map_type, name, key_size, 189 inner_map_fd, max_entries, map_flags, 190 -1); 191 } 192 193 static void * 194 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 195 __u32 actual_rec_size, __u32 expected_rec_size) 196 { 197 __u64 info_len = (__u64)actual_rec_size * cnt; 198 void *info, *nrecord; 199 int i; 200 201 info = malloc(info_len); 202 if (!info) 203 return NULL; 204 205 /* zero out bytes kernel does not understand */ 206 nrecord = info; 207 for (i = 0; i < cnt; i++) { 208 memcpy(nrecord, orecord, expected_rec_size); 209 memset(nrecord + expected_rec_size, 0, 210 actual_rec_size - expected_rec_size); 211 orecord += actual_rec_size; 212 nrecord += actual_rec_size; 213 } 214 215 return info; 216 } 217 218 int libbpf__bpf_prog_load(const struct bpf_prog_load_params *load_attr) 219 { 220 void *finfo = NULL, *linfo = NULL; 221 union bpf_attr attr; 222 int fd; 223 224 if (!load_attr->log_buf != !load_attr->log_buf_sz) 225 return -EINVAL; 226 227 if (load_attr->log_level > (4 | 2 | 1) || (load_attr->log_level && !load_attr->log_buf)) 228 return -EINVAL; 229 230 memset(&attr, 0, sizeof(attr)); 231 attr.prog_type = load_attr->prog_type; 232 attr.expected_attach_type = load_attr->expected_attach_type; 233 234 if (load_attr->attach_prog_fd) 235 attr.attach_prog_fd = load_attr->attach_prog_fd; 236 else 237 attr.attach_btf_obj_fd = load_attr->attach_btf_obj_fd; 238 attr.attach_btf_id = load_attr->attach_btf_id; 239 240 attr.prog_ifindex = load_attr->prog_ifindex; 241 attr.kern_version = load_attr->kern_version; 242 243 attr.insn_cnt = (__u32)load_attr->insn_cnt; 244 attr.insns = ptr_to_u64(load_attr->insns); 245 attr.license = ptr_to_u64(load_attr->license); 246 247 attr.log_level = load_attr->log_level; 248 if (attr.log_level) { 249 attr.log_buf = ptr_to_u64(load_attr->log_buf); 250 attr.log_size = load_attr->log_buf_sz; 251 } 252 253 attr.prog_btf_fd = load_attr->prog_btf_fd; 254 attr.prog_flags = load_attr->prog_flags; 255 256 attr.func_info_rec_size = load_attr->func_info_rec_size; 257 attr.func_info_cnt = load_attr->func_info_cnt; 258 attr.func_info = ptr_to_u64(load_attr->func_info); 259 260 attr.line_info_rec_size = load_attr->line_info_rec_size; 261 attr.line_info_cnt = load_attr->line_info_cnt; 262 attr.line_info = ptr_to_u64(load_attr->line_info); 263 264 if (load_attr->name) 265 memcpy(attr.prog_name, load_attr->name, 266 min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1)); 267 268 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 269 if (fd >= 0) 270 return fd; 271 272 /* After bpf_prog_load, the kernel may modify certain attributes 273 * to give user space a hint how to deal with loading failure. 274 * Check to see whether we can make some changes and load again. 275 */ 276 while (errno == E2BIG && (!finfo || !linfo)) { 277 if (!finfo && attr.func_info_cnt && 278 attr.func_info_rec_size < load_attr->func_info_rec_size) { 279 /* try with corrected func info records */ 280 finfo = alloc_zero_tailing_info(load_attr->func_info, 281 load_attr->func_info_cnt, 282 load_attr->func_info_rec_size, 283 attr.func_info_rec_size); 284 if (!finfo) 285 goto done; 286 287 attr.func_info = ptr_to_u64(finfo); 288 attr.func_info_rec_size = load_attr->func_info_rec_size; 289 } else if (!linfo && attr.line_info_cnt && 290 attr.line_info_rec_size < 291 load_attr->line_info_rec_size) { 292 linfo = alloc_zero_tailing_info(load_attr->line_info, 293 load_attr->line_info_cnt, 294 load_attr->line_info_rec_size, 295 attr.line_info_rec_size); 296 if (!linfo) 297 goto done; 298 299 attr.line_info = ptr_to_u64(linfo); 300 attr.line_info_rec_size = load_attr->line_info_rec_size; 301 } else { 302 break; 303 } 304 305 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 306 if (fd >= 0) 307 goto done; 308 } 309 310 if (load_attr->log_level || !load_attr->log_buf) 311 goto done; 312 313 /* Try again with log */ 314 attr.log_buf = ptr_to_u64(load_attr->log_buf); 315 attr.log_size = load_attr->log_buf_sz; 316 attr.log_level = 1; 317 load_attr->log_buf[0] = 0; 318 319 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 320 done: 321 free(finfo); 322 free(linfo); 323 return fd; 324 } 325 326 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 327 char *log_buf, size_t log_buf_sz) 328 { 329 struct bpf_prog_load_params p = {}; 330 331 if (!load_attr || !log_buf != !log_buf_sz) 332 return -EINVAL; 333 334 p.prog_type = load_attr->prog_type; 335 p.expected_attach_type = load_attr->expected_attach_type; 336 switch (p.prog_type) { 337 case BPF_PROG_TYPE_STRUCT_OPS: 338 case BPF_PROG_TYPE_LSM: 339 p.attach_btf_id = load_attr->attach_btf_id; 340 break; 341 case BPF_PROG_TYPE_TRACING: 342 case BPF_PROG_TYPE_EXT: 343 p.attach_btf_id = load_attr->attach_btf_id; 344 p.attach_prog_fd = load_attr->attach_prog_fd; 345 break; 346 default: 347 p.prog_ifindex = load_attr->prog_ifindex; 348 p.kern_version = load_attr->kern_version; 349 } 350 p.insn_cnt = load_attr->insns_cnt; 351 p.insns = load_attr->insns; 352 p.license = load_attr->license; 353 p.log_level = load_attr->log_level; 354 p.log_buf = log_buf; 355 p.log_buf_sz = log_buf_sz; 356 p.prog_btf_fd = load_attr->prog_btf_fd; 357 p.func_info_rec_size = load_attr->func_info_rec_size; 358 p.func_info_cnt = load_attr->func_info_cnt; 359 p.func_info = load_attr->func_info; 360 p.line_info_rec_size = load_attr->line_info_rec_size; 361 p.line_info_cnt = load_attr->line_info_cnt; 362 p.line_info = load_attr->line_info; 363 p.name = load_attr->name; 364 p.prog_flags = load_attr->prog_flags; 365 366 return libbpf__bpf_prog_load(&p); 367 } 368 369 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 370 size_t insns_cnt, const char *license, 371 __u32 kern_version, char *log_buf, 372 size_t log_buf_sz) 373 { 374 struct bpf_load_program_attr load_attr; 375 376 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 377 load_attr.prog_type = type; 378 load_attr.expected_attach_type = 0; 379 load_attr.name = NULL; 380 load_attr.insns = insns; 381 load_attr.insns_cnt = insns_cnt; 382 load_attr.license = license; 383 load_attr.kern_version = kern_version; 384 385 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 386 } 387 388 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 389 size_t insns_cnt, __u32 prog_flags, const char *license, 390 __u32 kern_version, char *log_buf, size_t log_buf_sz, 391 int log_level) 392 { 393 union bpf_attr attr; 394 395 memset(&attr, 0, sizeof(attr)); 396 attr.prog_type = type; 397 attr.insn_cnt = (__u32)insns_cnt; 398 attr.insns = ptr_to_u64(insns); 399 attr.license = ptr_to_u64(license); 400 attr.log_buf = ptr_to_u64(log_buf); 401 attr.log_size = log_buf_sz; 402 attr.log_level = log_level; 403 log_buf[0] = 0; 404 attr.kern_version = kern_version; 405 attr.prog_flags = prog_flags; 406 407 return sys_bpf_prog_load(&attr, sizeof(attr)); 408 } 409 410 int bpf_map_update_elem(int fd, const void *key, const void *value, 411 __u64 flags) 412 { 413 union bpf_attr attr; 414 415 memset(&attr, 0, sizeof(attr)); 416 attr.map_fd = fd; 417 attr.key = ptr_to_u64(key); 418 attr.value = ptr_to_u64(value); 419 attr.flags = flags; 420 421 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 422 } 423 424 int bpf_map_lookup_elem(int fd, const void *key, void *value) 425 { 426 union bpf_attr attr; 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); 432 433 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 434 } 435 436 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 437 { 438 union bpf_attr attr; 439 440 memset(&attr, 0, sizeof(attr)); 441 attr.map_fd = fd; 442 attr.key = ptr_to_u64(key); 443 attr.value = ptr_to_u64(value); 444 attr.flags = flags; 445 446 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 447 } 448 449 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 450 { 451 union bpf_attr attr; 452 453 memset(&attr, 0, sizeof(attr)); 454 attr.map_fd = fd; 455 attr.key = ptr_to_u64(key); 456 attr.value = ptr_to_u64(value); 457 458 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 459 } 460 461 int bpf_map_delete_elem(int fd, const void *key) 462 { 463 union bpf_attr attr; 464 465 memset(&attr, 0, sizeof(attr)); 466 attr.map_fd = fd; 467 attr.key = ptr_to_u64(key); 468 469 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 470 } 471 472 int bpf_map_get_next_key(int fd, const void *key, void *next_key) 473 { 474 union bpf_attr attr; 475 476 memset(&attr, 0, sizeof(attr)); 477 attr.map_fd = fd; 478 attr.key = ptr_to_u64(key); 479 attr.next_key = ptr_to_u64(next_key); 480 481 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 482 } 483 484 int bpf_map_freeze(int fd) 485 { 486 union bpf_attr attr; 487 488 memset(&attr, 0, sizeof(attr)); 489 attr.map_fd = fd; 490 491 return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 492 } 493 494 static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 495 void *out_batch, void *keys, void *values, 496 __u32 *count, 497 const struct bpf_map_batch_opts *opts) 498 { 499 union bpf_attr attr; 500 int ret; 501 502 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 503 return -EINVAL; 504 505 memset(&attr, 0, sizeof(attr)); 506 attr.batch.map_fd = fd; 507 attr.batch.in_batch = ptr_to_u64(in_batch); 508 attr.batch.out_batch = ptr_to_u64(out_batch); 509 attr.batch.keys = ptr_to_u64(keys); 510 attr.batch.values = ptr_to_u64(values); 511 attr.batch.count = *count; 512 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 513 attr.batch.flags = OPTS_GET(opts, flags, 0); 514 515 ret = sys_bpf(cmd, &attr, sizeof(attr)); 516 *count = attr.batch.count; 517 518 return ret; 519 } 520 521 int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 522 const struct bpf_map_batch_opts *opts) 523 { 524 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 525 NULL, keys, NULL, count, opts); 526 } 527 528 int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 529 void *values, __u32 *count, 530 const struct bpf_map_batch_opts *opts) 531 { 532 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 533 out_batch, keys, values, count, opts); 534 } 535 536 int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 537 void *keys, void *values, __u32 *count, 538 const struct bpf_map_batch_opts *opts) 539 { 540 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 541 fd, in_batch, out_batch, keys, values, 542 count, opts); 543 } 544 545 int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 546 const struct bpf_map_batch_opts *opts) 547 { 548 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 549 keys, values, count, opts); 550 } 551 552 int bpf_obj_pin(int fd, const char *pathname) 553 { 554 union bpf_attr attr; 555 556 memset(&attr, 0, sizeof(attr)); 557 attr.pathname = ptr_to_u64((void *)pathname); 558 attr.bpf_fd = fd; 559 560 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 561 } 562 563 int bpf_obj_get(const char *pathname) 564 { 565 union bpf_attr attr; 566 567 memset(&attr, 0, sizeof(attr)); 568 attr.pathname = ptr_to_u64((void *)pathname); 569 570 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 571 } 572 573 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 574 unsigned int flags) 575 { 576 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 577 .flags = flags, 578 ); 579 580 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 581 } 582 583 int bpf_prog_attach_xattr(int prog_fd, int target_fd, 584 enum bpf_attach_type type, 585 const struct bpf_prog_attach_opts *opts) 586 { 587 union bpf_attr attr; 588 589 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 590 return -EINVAL; 591 592 memset(&attr, 0, sizeof(attr)); 593 attr.target_fd = target_fd; 594 attr.attach_bpf_fd = prog_fd; 595 attr.attach_type = type; 596 attr.attach_flags = OPTS_GET(opts, flags, 0); 597 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 598 599 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 600 } 601 602 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 603 { 604 union bpf_attr attr; 605 606 memset(&attr, 0, sizeof(attr)); 607 attr.target_fd = target_fd; 608 attr.attach_type = type; 609 610 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 611 } 612 613 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 614 { 615 union bpf_attr attr; 616 617 memset(&attr, 0, sizeof(attr)); 618 attr.target_fd = target_fd; 619 attr.attach_bpf_fd = prog_fd; 620 attr.attach_type = type; 621 622 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 623 } 624 625 int bpf_link_create(int prog_fd, int target_fd, 626 enum bpf_attach_type attach_type, 627 const struct bpf_link_create_opts *opts) 628 { 629 __u32 target_btf_id, iter_info_len; 630 union bpf_attr attr; 631 632 if (!OPTS_VALID(opts, bpf_link_create_opts)) 633 return -EINVAL; 634 635 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 636 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 637 638 if (iter_info_len && target_btf_id) 639 return -EINVAL; 640 641 memset(&attr, 0, sizeof(attr)); 642 attr.link_create.prog_fd = prog_fd; 643 attr.link_create.target_fd = target_fd; 644 attr.link_create.attach_type = attach_type; 645 attr.link_create.flags = OPTS_GET(opts, flags, 0); 646 647 if (iter_info_len) { 648 attr.link_create.iter_info = 649 ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 650 attr.link_create.iter_info_len = iter_info_len; 651 } else if (target_btf_id) { 652 attr.link_create.target_btf_id = target_btf_id; 653 } 654 655 return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr)); 656 } 657 658 int bpf_link_detach(int link_fd) 659 { 660 union bpf_attr attr; 661 662 memset(&attr, 0, sizeof(attr)); 663 attr.link_detach.link_fd = link_fd; 664 665 return sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr)); 666 } 667 668 int bpf_link_update(int link_fd, int new_prog_fd, 669 const struct bpf_link_update_opts *opts) 670 { 671 union bpf_attr attr; 672 673 if (!OPTS_VALID(opts, bpf_link_update_opts)) 674 return -EINVAL; 675 676 memset(&attr, 0, sizeof(attr)); 677 attr.link_update.link_fd = link_fd; 678 attr.link_update.new_prog_fd = new_prog_fd; 679 attr.link_update.flags = OPTS_GET(opts, flags, 0); 680 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 681 682 return sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr)); 683 } 684 685 int bpf_iter_create(int link_fd) 686 { 687 union bpf_attr attr; 688 689 memset(&attr, 0, sizeof(attr)); 690 attr.iter_create.link_fd = link_fd; 691 692 return sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr)); 693 } 694 695 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 696 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 697 { 698 union bpf_attr attr; 699 int ret; 700 701 memset(&attr, 0, sizeof(attr)); 702 attr.query.target_fd = target_fd; 703 attr.query.attach_type = type; 704 attr.query.query_flags = query_flags; 705 attr.query.prog_cnt = *prog_cnt; 706 attr.query.prog_ids = ptr_to_u64(prog_ids); 707 708 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 709 if (attach_flags) 710 *attach_flags = attr.query.attach_flags; 711 *prog_cnt = attr.query.prog_cnt; 712 return ret; 713 } 714 715 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 716 void *data_out, __u32 *size_out, __u32 *retval, 717 __u32 *duration) 718 { 719 union bpf_attr attr; 720 int ret; 721 722 memset(&attr, 0, sizeof(attr)); 723 attr.test.prog_fd = prog_fd; 724 attr.test.data_in = ptr_to_u64(data); 725 attr.test.data_out = ptr_to_u64(data_out); 726 attr.test.data_size_in = size; 727 attr.test.repeat = repeat; 728 729 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 730 if (size_out) 731 *size_out = attr.test.data_size_out; 732 if (retval) 733 *retval = attr.test.retval; 734 if (duration) 735 *duration = attr.test.duration; 736 return ret; 737 } 738 739 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 740 { 741 union bpf_attr attr; 742 int ret; 743 744 if (!test_attr->data_out && test_attr->data_size_out > 0) 745 return -EINVAL; 746 747 memset(&attr, 0, sizeof(attr)); 748 attr.test.prog_fd = test_attr->prog_fd; 749 attr.test.data_in = ptr_to_u64(test_attr->data_in); 750 attr.test.data_out = ptr_to_u64(test_attr->data_out); 751 attr.test.data_size_in = test_attr->data_size_in; 752 attr.test.data_size_out = test_attr->data_size_out; 753 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 754 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 755 attr.test.ctx_size_in = test_attr->ctx_size_in; 756 attr.test.ctx_size_out = test_attr->ctx_size_out; 757 attr.test.repeat = test_attr->repeat; 758 759 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 760 test_attr->data_size_out = attr.test.data_size_out; 761 test_attr->ctx_size_out = attr.test.ctx_size_out; 762 test_attr->retval = attr.test.retval; 763 test_attr->duration = attr.test.duration; 764 return ret; 765 } 766 767 int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 768 { 769 union bpf_attr attr; 770 int ret; 771 772 if (!OPTS_VALID(opts, bpf_test_run_opts)) 773 return -EINVAL; 774 775 memset(&attr, 0, sizeof(attr)); 776 attr.test.prog_fd = prog_fd; 777 attr.test.cpu = OPTS_GET(opts, cpu, 0); 778 attr.test.flags = OPTS_GET(opts, flags, 0); 779 attr.test.repeat = OPTS_GET(opts, repeat, 0); 780 attr.test.duration = OPTS_GET(opts, duration, 0); 781 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 782 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 783 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 784 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 785 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 786 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 787 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 788 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 789 790 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 791 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 792 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 793 OPTS_SET(opts, duration, attr.test.duration); 794 OPTS_SET(opts, retval, attr.test.retval); 795 return ret; 796 } 797 798 static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 799 { 800 union bpf_attr attr; 801 int err; 802 803 memset(&attr, 0, sizeof(attr)); 804 attr.start_id = start_id; 805 806 err = sys_bpf(cmd, &attr, sizeof(attr)); 807 if (!err) 808 *next_id = attr.next_id; 809 810 return err; 811 } 812 813 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 814 { 815 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 816 } 817 818 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 819 { 820 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 821 } 822 823 int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 824 { 825 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 826 } 827 828 int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 829 { 830 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 831 } 832 833 int bpf_prog_get_fd_by_id(__u32 id) 834 { 835 union bpf_attr attr; 836 837 memset(&attr, 0, sizeof(attr)); 838 attr.prog_id = id; 839 840 return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 841 } 842 843 int bpf_map_get_fd_by_id(__u32 id) 844 { 845 union bpf_attr attr; 846 847 memset(&attr, 0, sizeof(attr)); 848 attr.map_id = id; 849 850 return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 851 } 852 853 int bpf_btf_get_fd_by_id(__u32 id) 854 { 855 union bpf_attr attr; 856 857 memset(&attr, 0, sizeof(attr)); 858 attr.btf_id = id; 859 860 return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 861 } 862 863 int bpf_link_get_fd_by_id(__u32 id) 864 { 865 union bpf_attr attr; 866 867 memset(&attr, 0, sizeof(attr)); 868 attr.link_id = id; 869 870 return sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr)); 871 } 872 873 int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 874 { 875 union bpf_attr attr; 876 int err; 877 878 memset(&attr, 0, sizeof(attr)); 879 attr.info.bpf_fd = bpf_fd; 880 attr.info.info_len = *info_len; 881 attr.info.info = ptr_to_u64(info); 882 883 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 884 if (!err) 885 *info_len = attr.info.info_len; 886 887 return err; 888 } 889 890 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 891 { 892 union bpf_attr attr; 893 894 memset(&attr, 0, sizeof(attr)); 895 attr.raw_tracepoint.name = ptr_to_u64(name); 896 attr.raw_tracepoint.prog_fd = prog_fd; 897 898 return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 899 } 900 901 int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 902 bool do_log) 903 { 904 union bpf_attr attr = {}; 905 int fd; 906 907 attr.btf = ptr_to_u64(btf); 908 attr.btf_size = btf_size; 909 910 retry: 911 if (do_log && log_buf && log_buf_size) { 912 attr.btf_log_level = 1; 913 attr.btf_log_size = log_buf_size; 914 attr.btf_log_buf = ptr_to_u64(log_buf); 915 } 916 917 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 918 if (fd == -1 && !do_log && log_buf && log_buf_size) { 919 do_log = true; 920 goto retry; 921 } 922 923 return fd; 924 } 925 926 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 927 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 928 __u64 *probe_addr) 929 { 930 union bpf_attr attr = {}; 931 int err; 932 933 attr.task_fd_query.pid = pid; 934 attr.task_fd_query.fd = fd; 935 attr.task_fd_query.flags = flags; 936 attr.task_fd_query.buf = ptr_to_u64(buf); 937 attr.task_fd_query.buf_len = *buf_len; 938 939 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 940 *buf_len = attr.task_fd_query.buf_len; 941 *prog_id = attr.task_fd_query.prog_id; 942 *fd_type = attr.task_fd_query.fd_type; 943 *probe_offset = attr.task_fd_query.probe_offset; 944 *probe_addr = attr.task_fd_query.probe_addr; 945 946 return err; 947 } 948 949 int bpf_enable_stats(enum bpf_stats_type type) 950 { 951 union bpf_attr attr; 952 953 memset(&attr, 0, sizeof(attr)); 954 attr.enable_stats.type = type; 955 956 return sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr)); 957 } 958 959 int bpf_prog_bind_map(int prog_fd, int map_fd, 960 const struct bpf_prog_bind_opts *opts) 961 { 962 union bpf_attr attr; 963 964 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 965 return -EINVAL; 966 967 memset(&attr, 0, sizeof(attr)); 968 attr.prog_bind_map.prog_fd = prog_fd; 969 attr.prog_bind_map.map_fd = map_fd; 970 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 971 972 return sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr)); 973 } 974