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 57static inline __u64 ptr_to_u64(const void *ptr) 58{ 59 return (__u64) (unsigned long) ptr; 60} 61 62static 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 68static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size) 69{ 70 int fd; 71 72 do { 73 fd = sys_bpf(BPF_PROG_LOAD, attr, size); 74 } while (fd < 0 && errno == EAGAIN); 75 76 return fd; 77} 78 79int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) 80{ 81 union bpf_attr attr; 82 83 memset(&attr, '\0', sizeof(attr)); 84 85 attr.map_type = create_attr->map_type; 86 attr.key_size = create_attr->key_size; 87 attr.value_size = create_attr->value_size; 88 attr.max_entries = create_attr->max_entries; 89 attr.map_flags = create_attr->map_flags; 90 if (create_attr->name) 91 memcpy(attr.map_name, create_attr->name, 92 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1)); 93 attr.numa_node = create_attr->numa_node; 94 attr.btf_fd = create_attr->btf_fd; 95 attr.btf_key_type_id = create_attr->btf_key_type_id; 96 attr.btf_value_type_id = create_attr->btf_value_type_id; 97 attr.map_ifindex = create_attr->map_ifindex; 98 if (attr.map_type == BPF_MAP_TYPE_STRUCT_OPS) 99 attr.btf_vmlinux_value_type_id = 100 create_attr->btf_vmlinux_value_type_id; 101 else 102 attr.inner_map_fd = create_attr->inner_map_fd; 103 104 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 105} 106 107int bpf_create_map_node(enum bpf_map_type map_type, const char *name, 108 int key_size, int value_size, int max_entries, 109 __u32 map_flags, int node) 110{ 111 struct bpf_create_map_attr map_attr = {}; 112 113 map_attr.name = name; 114 map_attr.map_type = map_type; 115 map_attr.map_flags = map_flags; 116 map_attr.key_size = key_size; 117 map_attr.value_size = value_size; 118 map_attr.max_entries = max_entries; 119 if (node >= 0) { 120 map_attr.numa_node = node; 121 map_attr.map_flags |= BPF_F_NUMA_NODE; 122 } 123 124 return bpf_create_map_xattr(&map_attr); 125} 126 127int bpf_create_map(enum bpf_map_type map_type, int key_size, 128 int value_size, int max_entries, __u32 map_flags) 129{ 130 struct bpf_create_map_attr map_attr = {}; 131 132 map_attr.map_type = map_type; 133 map_attr.map_flags = map_flags; 134 map_attr.key_size = key_size; 135 map_attr.value_size = value_size; 136 map_attr.max_entries = max_entries; 137 138 return bpf_create_map_xattr(&map_attr); 139} 140 141int bpf_create_map_name(enum bpf_map_type map_type, const char *name, 142 int key_size, int value_size, int max_entries, 143 __u32 map_flags) 144{ 145 struct bpf_create_map_attr map_attr = {}; 146 147 map_attr.name = name; 148 map_attr.map_type = map_type; 149 map_attr.map_flags = map_flags; 150 map_attr.key_size = key_size; 151 map_attr.value_size = value_size; 152 map_attr.max_entries = max_entries; 153 154 return bpf_create_map_xattr(&map_attr); 155} 156 157int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name, 158 int key_size, int inner_map_fd, int max_entries, 159 __u32 map_flags, int node) 160{ 161 union bpf_attr attr; 162 163 memset(&attr, '\0', sizeof(attr)); 164 165 attr.map_type = map_type; 166 attr.key_size = key_size; 167 attr.value_size = 4; 168 attr.inner_map_fd = inner_map_fd; 169 attr.max_entries = max_entries; 170 attr.map_flags = map_flags; 171 if (name) 172 memcpy(attr.map_name, name, 173 min(strlen(name), BPF_OBJ_NAME_LEN - 1)); 174 175 if (node >= 0) { 176 attr.map_flags |= BPF_F_NUMA_NODE; 177 attr.numa_node = node; 178 } 179 180 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 181} 182 183int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, 184 int key_size, int inner_map_fd, int max_entries, 185 __u32 map_flags) 186{ 187 return bpf_create_map_in_map_node(map_type, name, key_size, 188 inner_map_fd, max_entries, map_flags, 189 -1); 190} 191 192static void * 193alloc_zero_tailing_info(const void *orecord, __u32 cnt, 194 __u32 actual_rec_size, __u32 expected_rec_size) 195{ 196 __u64 info_len = (__u64)actual_rec_size * cnt; 197 void *info, *nrecord; 198 int i; 199 200 info = malloc(info_len); 201 if (!info) 202 return NULL; 203 204 /* zero out bytes kernel does not understand */ 205 nrecord = info; 206 for (i = 0; i < cnt; i++) { 207 memcpy(nrecord, orecord, expected_rec_size); 208 memset(nrecord + expected_rec_size, 0, 209 actual_rec_size - expected_rec_size); 210 orecord += actual_rec_size; 211 nrecord += actual_rec_size; 212 } 213 214 return info; 215} 216 217int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 218 char *log_buf, size_t log_buf_sz) 219{ 220 void *finfo = NULL, *linfo = NULL; 221 union bpf_attr attr; 222 __u32 log_level; 223 int fd; 224 225 if (!load_attr || !log_buf != !log_buf_sz) 226 return -EINVAL; 227 228 log_level = load_attr->log_level; 229 if (log_level > (4 | 2 | 1) || (log_level && !log_buf)) 230 return -EINVAL; 231 232 memset(&attr, 0, sizeof(attr)); 233 attr.prog_type = load_attr->prog_type; 234 attr.expected_attach_type = load_attr->expected_attach_type; 235 if (attr.prog_type == BPF_PROG_TYPE_STRUCT_OPS || 236 attr.prog_type == BPF_PROG_TYPE_LSM) { 237 attr.attach_btf_id = load_attr->attach_btf_id; 238 } else if (attr.prog_type == BPF_PROG_TYPE_TRACING || 239 attr.prog_type == BPF_PROG_TYPE_EXT) { 240 attr.attach_btf_id = load_attr->attach_btf_id; 241 attr.attach_prog_fd = load_attr->attach_prog_fd; 242 } else { 243 attr.prog_ifindex = load_attr->prog_ifindex; 244 attr.kern_version = load_attr->kern_version; 245 } 246 attr.insn_cnt = (__u32)load_attr->insns_cnt; 247 attr.insns = ptr_to_u64(load_attr->insns); 248 attr.license = ptr_to_u64(load_attr->license); 249 250 attr.log_level = log_level; 251 if (log_level) { 252 attr.log_buf = ptr_to_u64(log_buf); 253 attr.log_size = log_buf_sz; 254 } else { 255 attr.log_buf = ptr_to_u64(NULL); 256 attr.log_size = 0; 257 } 258 259 attr.prog_btf_fd = load_attr->prog_btf_fd; 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 attr.line_info_rec_size = load_attr->line_info_rec_size; 264 attr.line_info_cnt = load_attr->line_info_cnt; 265 attr.line_info = ptr_to_u64(load_attr->line_info); 266 if (load_attr->name) 267 memcpy(attr.prog_name, load_attr->name, 268 min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1)); 269 attr.prog_flags = load_attr->prog_flags; 270 271 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 272 if (fd >= 0) 273 return fd; 274 275 /* After bpf_prog_load, the kernel may modify certain attributes 276 * to give user space a hint how to deal with loading failure. 277 * Check to see whether we can make some changes and load again. 278 */ 279 while (errno == E2BIG && (!finfo || !linfo)) { 280 if (!finfo && attr.func_info_cnt && 281 attr.func_info_rec_size < load_attr->func_info_rec_size) { 282 /* try with corrected func info records */ 283 finfo = alloc_zero_tailing_info(load_attr->func_info, 284 load_attr->func_info_cnt, 285 load_attr->func_info_rec_size, 286 attr.func_info_rec_size); 287 if (!finfo) 288 goto done; 289 290 attr.func_info = ptr_to_u64(finfo); 291 attr.func_info_rec_size = load_attr->func_info_rec_size; 292 } else if (!linfo && attr.line_info_cnt && 293 attr.line_info_rec_size < 294 load_attr->line_info_rec_size) { 295 linfo = alloc_zero_tailing_info(load_attr->line_info, 296 load_attr->line_info_cnt, 297 load_attr->line_info_rec_size, 298 attr.line_info_rec_size); 299 if (!linfo) 300 goto done; 301 302 attr.line_info = ptr_to_u64(linfo); 303 attr.line_info_rec_size = load_attr->line_info_rec_size; 304 } else { 305 break; 306 } 307 308 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 309 310 if (fd >= 0) 311 goto done; 312 } 313 314 if (log_level || !log_buf) 315 goto done; 316 317 /* Try again with log */ 318 attr.log_buf = ptr_to_u64(log_buf); 319 attr.log_size = log_buf_sz; 320 attr.log_level = 1; 321 log_buf[0] = 0; 322 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 323done: 324 free(finfo); 325 free(linfo); 326 return fd; 327} 328 329int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 330 size_t insns_cnt, const char *license, 331 __u32 kern_version, char *log_buf, 332 size_t log_buf_sz) 333{ 334 struct bpf_load_program_attr load_attr; 335 336 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 337 load_attr.prog_type = type; 338 load_attr.expected_attach_type = 0; 339 load_attr.name = NULL; 340 load_attr.insns = insns; 341 load_attr.insns_cnt = insns_cnt; 342 load_attr.license = license; 343 load_attr.kern_version = kern_version; 344 345 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 346} 347 348int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 349 size_t insns_cnt, __u32 prog_flags, const char *license, 350 __u32 kern_version, char *log_buf, size_t log_buf_sz, 351 int log_level) 352{ 353 union bpf_attr attr; 354 355 memset(&attr, 0, sizeof(attr)); 356 attr.prog_type = type; 357 attr.insn_cnt = (__u32)insns_cnt; 358 attr.insns = ptr_to_u64(insns); 359 attr.license = ptr_to_u64(license); 360 attr.log_buf = ptr_to_u64(log_buf); 361 attr.log_size = log_buf_sz; 362 attr.log_level = log_level; 363 log_buf[0] = 0; 364 attr.kern_version = kern_version; 365 attr.prog_flags = prog_flags; 366 367 return sys_bpf_prog_load(&attr, sizeof(attr)); 368} 369 370int bpf_map_update_elem(int fd, const void *key, const void *value, 371 __u64 flags) 372{ 373 union bpf_attr attr; 374 375 memset(&attr, 0, sizeof(attr)); 376 attr.map_fd = fd; 377 attr.key = ptr_to_u64(key); 378 attr.value = ptr_to_u64(value); 379 attr.flags = flags; 380 381 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 382} 383 384int bpf_map_lookup_elem(int fd, const void *key, void *value) 385{ 386 union bpf_attr attr; 387 388 memset(&attr, 0, sizeof(attr)); 389 attr.map_fd = fd; 390 attr.key = ptr_to_u64(key); 391 attr.value = ptr_to_u64(value); 392 393 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 394} 395 396int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 397{ 398 union bpf_attr attr; 399 400 memset(&attr, 0, sizeof(attr)); 401 attr.map_fd = fd; 402 attr.key = ptr_to_u64(key); 403 attr.value = ptr_to_u64(value); 404 attr.flags = flags; 405 406 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 407} 408 409int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 410{ 411 union bpf_attr attr; 412 413 memset(&attr, 0, sizeof(attr)); 414 attr.map_fd = fd; 415 attr.key = ptr_to_u64(key); 416 attr.value = ptr_to_u64(value); 417 418 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 419} 420 421int bpf_map_delete_elem(int fd, const void *key) 422{ 423 union bpf_attr attr; 424 425 memset(&attr, 0, sizeof(attr)); 426 attr.map_fd = fd; 427 attr.key = ptr_to_u64(key); 428 429 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 430} 431 432int bpf_map_get_next_key(int fd, const void *key, void *next_key) 433{ 434 union bpf_attr attr; 435 436 memset(&attr, 0, sizeof(attr)); 437 attr.map_fd = fd; 438 attr.key = ptr_to_u64(key); 439 attr.next_key = ptr_to_u64(next_key); 440 441 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 442} 443 444int bpf_map_freeze(int fd) 445{ 446 union bpf_attr attr; 447 448 memset(&attr, 0, sizeof(attr)); 449 attr.map_fd = fd; 450 451 return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 452} 453 454static int bpf_map_batch_common(int cmd, int fd, void *in_batch, 455 void *out_batch, void *keys, void *values, 456 __u32 *count, 457 const struct bpf_map_batch_opts *opts) 458{ 459 union bpf_attr attr; 460 int ret; 461 462 if (!OPTS_VALID(opts, bpf_map_batch_opts)) 463 return -EINVAL; 464 465 memset(&attr, 0, sizeof(attr)); 466 attr.batch.map_fd = fd; 467 attr.batch.in_batch = ptr_to_u64(in_batch); 468 attr.batch.out_batch = ptr_to_u64(out_batch); 469 attr.batch.keys = ptr_to_u64(keys); 470 attr.batch.values = ptr_to_u64(values); 471 attr.batch.count = *count; 472 attr.batch.elem_flags = OPTS_GET(opts, elem_flags, 0); 473 attr.batch.flags = OPTS_GET(opts, flags, 0); 474 475 ret = sys_bpf(cmd, &attr, sizeof(attr)); 476 *count = attr.batch.count; 477 478 return ret; 479} 480 481int bpf_map_delete_batch(int fd, void *keys, __u32 *count, 482 const struct bpf_map_batch_opts *opts) 483{ 484 return bpf_map_batch_common(BPF_MAP_DELETE_BATCH, fd, NULL, 485 NULL, keys, NULL, count, opts); 486} 487 488int bpf_map_lookup_batch(int fd, void *in_batch, void *out_batch, void *keys, 489 void *values, __u32 *count, 490 const struct bpf_map_batch_opts *opts) 491{ 492 return bpf_map_batch_common(BPF_MAP_LOOKUP_BATCH, fd, in_batch, 493 out_batch, keys, values, count, opts); 494} 495 496int bpf_map_lookup_and_delete_batch(int fd, void *in_batch, void *out_batch, 497 void *keys, void *values, __u32 *count, 498 const struct bpf_map_batch_opts *opts) 499{ 500 return bpf_map_batch_common(BPF_MAP_LOOKUP_AND_DELETE_BATCH, 501 fd, in_batch, out_batch, keys, values, 502 count, opts); 503} 504 505int bpf_map_update_batch(int fd, void *keys, void *values, __u32 *count, 506 const struct bpf_map_batch_opts *opts) 507{ 508 return bpf_map_batch_common(BPF_MAP_UPDATE_BATCH, fd, NULL, NULL, 509 keys, values, count, opts); 510} 511 512int bpf_obj_pin(int fd, const char *pathname) 513{ 514 union bpf_attr attr; 515 516 memset(&attr, 0, sizeof(attr)); 517 attr.pathname = ptr_to_u64((void *)pathname); 518 attr.bpf_fd = fd; 519 520 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 521} 522 523int bpf_obj_get(const char *pathname) 524{ 525 union bpf_attr attr; 526 527 memset(&attr, 0, sizeof(attr)); 528 attr.pathname = ptr_to_u64((void *)pathname); 529 530 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 531} 532 533int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 534 unsigned int flags) 535{ 536 DECLARE_LIBBPF_OPTS(bpf_prog_attach_opts, opts, 537 .flags = flags, 538 ); 539 540 return bpf_prog_attach_xattr(prog_fd, target_fd, type, &opts); 541} 542 543int bpf_prog_attach_xattr(int prog_fd, int target_fd, 544 enum bpf_attach_type type, 545 const struct bpf_prog_attach_opts *opts) 546{ 547 union bpf_attr attr; 548 549 if (!OPTS_VALID(opts, bpf_prog_attach_opts)) 550 return -EINVAL; 551 552 memset(&attr, 0, sizeof(attr)); 553 attr.target_fd = target_fd; 554 attr.attach_bpf_fd = prog_fd; 555 attr.attach_type = type; 556 attr.attach_flags = OPTS_GET(opts, flags, 0); 557 attr.replace_bpf_fd = OPTS_GET(opts, replace_prog_fd, 0); 558 559 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 560} 561 562int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 563{ 564 union bpf_attr attr; 565 566 memset(&attr, 0, sizeof(attr)); 567 attr.target_fd = target_fd; 568 attr.attach_type = type; 569 570 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 571} 572 573int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 574{ 575 union bpf_attr attr; 576 577 memset(&attr, 0, sizeof(attr)); 578 attr.target_fd = target_fd; 579 attr.attach_bpf_fd = prog_fd; 580 attr.attach_type = type; 581 582 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 583} 584 585int bpf_link_create(int prog_fd, int target_fd, 586 enum bpf_attach_type attach_type, 587 const struct bpf_link_create_opts *opts) 588{ 589 __u32 target_btf_id, iter_info_len; 590 union bpf_attr attr; 591 592 if (!OPTS_VALID(opts, bpf_link_create_opts)) 593 return -EINVAL; 594 595 iter_info_len = OPTS_GET(opts, iter_info_len, 0); 596 target_btf_id = OPTS_GET(opts, target_btf_id, 0); 597 598 if (iter_info_len && target_btf_id) 599 return -EINVAL; 600 601 memset(&attr, 0, sizeof(attr)); 602 attr.link_create.prog_fd = prog_fd; 603 attr.link_create.target_fd = target_fd; 604 attr.link_create.attach_type = attach_type; 605 attr.link_create.flags = OPTS_GET(opts, flags, 0); 606 607 if (iter_info_len) { 608 attr.link_create.iter_info = 609 ptr_to_u64(OPTS_GET(opts, iter_info, (void *)0)); 610 attr.link_create.iter_info_len = iter_info_len; 611 } else if (target_btf_id) { 612 attr.link_create.target_btf_id = target_btf_id; 613 } 614 615 return sys_bpf(BPF_LINK_CREATE, &attr, sizeof(attr)); 616} 617 618int bpf_link_detach(int link_fd) 619{ 620 union bpf_attr attr; 621 622 memset(&attr, 0, sizeof(attr)); 623 attr.link_detach.link_fd = link_fd; 624 625 return sys_bpf(BPF_LINK_DETACH, &attr, sizeof(attr)); 626} 627 628int bpf_link_update(int link_fd, int new_prog_fd, 629 const struct bpf_link_update_opts *opts) 630{ 631 union bpf_attr attr; 632 633 if (!OPTS_VALID(opts, bpf_link_update_opts)) 634 return -EINVAL; 635 636 memset(&attr, 0, sizeof(attr)); 637 attr.link_update.link_fd = link_fd; 638 attr.link_update.new_prog_fd = new_prog_fd; 639 attr.link_update.flags = OPTS_GET(opts, flags, 0); 640 attr.link_update.old_prog_fd = OPTS_GET(opts, old_prog_fd, 0); 641 642 return sys_bpf(BPF_LINK_UPDATE, &attr, sizeof(attr)); 643} 644 645int bpf_iter_create(int link_fd) 646{ 647 union bpf_attr attr; 648 649 memset(&attr, 0, sizeof(attr)); 650 attr.iter_create.link_fd = link_fd; 651 652 return sys_bpf(BPF_ITER_CREATE, &attr, sizeof(attr)); 653} 654 655int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 656 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 657{ 658 union bpf_attr attr; 659 int ret; 660 661 memset(&attr, 0, sizeof(attr)); 662 attr.query.target_fd = target_fd; 663 attr.query.attach_type = type; 664 attr.query.query_flags = query_flags; 665 attr.query.prog_cnt = *prog_cnt; 666 attr.query.prog_ids = ptr_to_u64(prog_ids); 667 668 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 669 if (attach_flags) 670 *attach_flags = attr.query.attach_flags; 671 *prog_cnt = attr.query.prog_cnt; 672 return ret; 673} 674 675int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 676 void *data_out, __u32 *size_out, __u32 *retval, 677 __u32 *duration) 678{ 679 union bpf_attr attr; 680 int ret; 681 682 memset(&attr, 0, sizeof(attr)); 683 attr.test.prog_fd = prog_fd; 684 attr.test.data_in = ptr_to_u64(data); 685 attr.test.data_out = ptr_to_u64(data_out); 686 attr.test.data_size_in = size; 687 attr.test.repeat = repeat; 688 689 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 690 if (size_out) 691 *size_out = attr.test.data_size_out; 692 if (retval) 693 *retval = attr.test.retval; 694 if (duration) 695 *duration = attr.test.duration; 696 return ret; 697} 698 699int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 700{ 701 union bpf_attr attr; 702 int ret; 703 704 if (!test_attr->data_out && test_attr->data_size_out > 0) 705 return -EINVAL; 706 707 memset(&attr, 0, sizeof(attr)); 708 attr.test.prog_fd = test_attr->prog_fd; 709 attr.test.data_in = ptr_to_u64(test_attr->data_in); 710 attr.test.data_out = ptr_to_u64(test_attr->data_out); 711 attr.test.data_size_in = test_attr->data_size_in; 712 attr.test.data_size_out = test_attr->data_size_out; 713 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 714 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 715 attr.test.ctx_size_in = test_attr->ctx_size_in; 716 attr.test.ctx_size_out = test_attr->ctx_size_out; 717 attr.test.repeat = test_attr->repeat; 718 719 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 720 test_attr->data_size_out = attr.test.data_size_out; 721 test_attr->ctx_size_out = attr.test.ctx_size_out; 722 test_attr->retval = attr.test.retval; 723 test_attr->duration = attr.test.duration; 724 return ret; 725} 726 727int bpf_prog_test_run_opts(int prog_fd, struct bpf_test_run_opts *opts) 728{ 729 union bpf_attr attr; 730 int ret; 731 732 if (!OPTS_VALID(opts, bpf_test_run_opts)) 733 return -EINVAL; 734 735 memset(&attr, 0, sizeof(attr)); 736 attr.test.prog_fd = prog_fd; 737 attr.test.cpu = OPTS_GET(opts, cpu, 0); 738 attr.test.flags = OPTS_GET(opts, flags, 0); 739 attr.test.repeat = OPTS_GET(opts, repeat, 0); 740 attr.test.duration = OPTS_GET(opts, duration, 0); 741 attr.test.ctx_size_in = OPTS_GET(opts, ctx_size_in, 0); 742 attr.test.ctx_size_out = OPTS_GET(opts, ctx_size_out, 0); 743 attr.test.data_size_in = OPTS_GET(opts, data_size_in, 0); 744 attr.test.data_size_out = OPTS_GET(opts, data_size_out, 0); 745 attr.test.ctx_in = ptr_to_u64(OPTS_GET(opts, ctx_in, NULL)); 746 attr.test.ctx_out = ptr_to_u64(OPTS_GET(opts, ctx_out, NULL)); 747 attr.test.data_in = ptr_to_u64(OPTS_GET(opts, data_in, NULL)); 748 attr.test.data_out = ptr_to_u64(OPTS_GET(opts, data_out, NULL)); 749 750 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 751 OPTS_SET(opts, data_size_out, attr.test.data_size_out); 752 OPTS_SET(opts, ctx_size_out, attr.test.ctx_size_out); 753 OPTS_SET(opts, duration, attr.test.duration); 754 OPTS_SET(opts, retval, attr.test.retval); 755 return ret; 756} 757 758static int bpf_obj_get_next_id(__u32 start_id, __u32 *next_id, int cmd) 759{ 760 union bpf_attr attr; 761 int err; 762 763 memset(&attr, 0, sizeof(attr)); 764 attr.start_id = start_id; 765 766 err = sys_bpf(cmd, &attr, sizeof(attr)); 767 if (!err) 768 *next_id = attr.next_id; 769 770 return err; 771} 772 773int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 774{ 775 return bpf_obj_get_next_id(start_id, next_id, BPF_PROG_GET_NEXT_ID); 776} 777 778int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 779{ 780 return bpf_obj_get_next_id(start_id, next_id, BPF_MAP_GET_NEXT_ID); 781} 782 783int bpf_btf_get_next_id(__u32 start_id, __u32 *next_id) 784{ 785 return bpf_obj_get_next_id(start_id, next_id, BPF_BTF_GET_NEXT_ID); 786} 787 788int bpf_link_get_next_id(__u32 start_id, __u32 *next_id) 789{ 790 return bpf_obj_get_next_id(start_id, next_id, BPF_LINK_GET_NEXT_ID); 791} 792 793int bpf_prog_get_fd_by_id(__u32 id) 794{ 795 union bpf_attr attr; 796 797 memset(&attr, 0, sizeof(attr)); 798 attr.prog_id = id; 799 800 return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 801} 802 803int bpf_map_get_fd_by_id(__u32 id) 804{ 805 union bpf_attr attr; 806 807 memset(&attr, 0, sizeof(attr)); 808 attr.map_id = id; 809 810 return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 811} 812 813int bpf_btf_get_fd_by_id(__u32 id) 814{ 815 union bpf_attr attr; 816 817 memset(&attr, 0, sizeof(attr)); 818 attr.btf_id = id; 819 820 return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 821} 822 823int bpf_link_get_fd_by_id(__u32 id) 824{ 825 union bpf_attr attr; 826 827 memset(&attr, 0, sizeof(attr)); 828 attr.link_id = id; 829 830 return sys_bpf(BPF_LINK_GET_FD_BY_ID, &attr, sizeof(attr)); 831} 832 833int bpf_obj_get_info_by_fd(int bpf_fd, void *info, __u32 *info_len) 834{ 835 union bpf_attr attr; 836 int err; 837 838 memset(&attr, 0, sizeof(attr)); 839 attr.info.bpf_fd = bpf_fd; 840 attr.info.info_len = *info_len; 841 attr.info.info = ptr_to_u64(info); 842 843 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 844 if (!err) 845 *info_len = attr.info.info_len; 846 847 return err; 848} 849 850int bpf_raw_tracepoint_open(const char *name, int prog_fd) 851{ 852 union bpf_attr attr; 853 854 memset(&attr, 0, sizeof(attr)); 855 attr.raw_tracepoint.name = ptr_to_u64(name); 856 attr.raw_tracepoint.prog_fd = prog_fd; 857 858 return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 859} 860 861int bpf_load_btf(const void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 862 bool do_log) 863{ 864 union bpf_attr attr = {}; 865 int fd; 866 867 attr.btf = ptr_to_u64(btf); 868 attr.btf_size = btf_size; 869 870retry: 871 if (do_log && log_buf && log_buf_size) { 872 attr.btf_log_level = 1; 873 attr.btf_log_size = log_buf_size; 874 attr.btf_log_buf = ptr_to_u64(log_buf); 875 } 876 877 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 878 if (fd == -1 && !do_log && log_buf && log_buf_size) { 879 do_log = true; 880 goto retry; 881 } 882 883 return fd; 884} 885 886int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 887 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 888 __u64 *probe_addr) 889{ 890 union bpf_attr attr = {}; 891 int err; 892 893 attr.task_fd_query.pid = pid; 894 attr.task_fd_query.fd = fd; 895 attr.task_fd_query.flags = flags; 896 attr.task_fd_query.buf = ptr_to_u64(buf); 897 attr.task_fd_query.buf_len = *buf_len; 898 899 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 900 *buf_len = attr.task_fd_query.buf_len; 901 *prog_id = attr.task_fd_query.prog_id; 902 *fd_type = attr.task_fd_query.fd_type; 903 *probe_offset = attr.task_fd_query.probe_offset; 904 *probe_addr = attr.task_fd_query.probe_addr; 905 906 return err; 907} 908 909int bpf_enable_stats(enum bpf_stats_type type) 910{ 911 union bpf_attr attr; 912 913 memset(&attr, 0, sizeof(attr)); 914 attr.enable_stats.type = type; 915 916 return sys_bpf(BPF_ENABLE_STATS, &attr, sizeof(attr)); 917} 918 919int bpf_prog_bind_map(int prog_fd, int map_fd, 920 const struct bpf_prog_bind_opts *opts) 921{ 922 union bpf_attr attr; 923 924 if (!OPTS_VALID(opts, bpf_prog_bind_opts)) 925 return -EINVAL; 926 927 memset(&attr, 0, sizeof(attr)); 928 attr.prog_bind_map.prog_fd = prog_fd; 929 attr.prog_bind_map.map_fd = map_fd; 930 attr.prog_bind_map.flags = OPTS_GET(opts, flags, 0); 931 932 return sys_bpf(BPF_PROG_BIND_MAP, &attr, sizeof(attr)); 933} 934