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 <linux/bpf.h> 30 #include "bpf.h" 31 #include "libbpf.h" 32 #include <errno.h> 33 34 /* 35 * When building perf, unistd.h is overridden. __NR_bpf is 36 * required to be defined explicitly. 37 */ 38 #ifndef __NR_bpf 39 # if defined(__i386__) 40 # define __NR_bpf 357 41 # elif defined(__x86_64__) 42 # define __NR_bpf 321 43 # elif defined(__aarch64__) 44 # define __NR_bpf 280 45 # elif defined(__sparc__) 46 # define __NR_bpf 349 47 # elif defined(__s390__) 48 # define __NR_bpf 351 49 # elif defined(__arc__) 50 # define __NR_bpf 280 51 # else 52 # error __NR_bpf not defined. libbpf does not support your arch. 53 # endif 54 #endif 55 56 #ifndef min 57 #define min(x, y) ((x) < (y) ? (x) : (y)) 58 #endif 59 60 static inline __u64 ptr_to_u64(const void *ptr) 61 { 62 return (__u64) (unsigned long) ptr; 63 } 64 65 static inline int sys_bpf(enum bpf_cmd cmd, union bpf_attr *attr, 66 unsigned int size) 67 { 68 return syscall(__NR_bpf, cmd, attr, size); 69 } 70 71 static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size) 72 { 73 int fd; 74 75 do { 76 fd = sys_bpf(BPF_PROG_LOAD, attr, size); 77 } while (fd < 0 && errno == EAGAIN); 78 79 return fd; 80 } 81 82 int bpf_create_map_xattr(const struct bpf_create_map_attr *create_attr) 83 { 84 union bpf_attr attr; 85 86 memset(&attr, '\0', sizeof(attr)); 87 88 attr.map_type = create_attr->map_type; 89 attr.key_size = create_attr->key_size; 90 attr.value_size = create_attr->value_size; 91 attr.max_entries = create_attr->max_entries; 92 attr.map_flags = create_attr->map_flags; 93 if (create_attr->name) 94 memcpy(attr.map_name, create_attr->name, 95 min(strlen(create_attr->name), BPF_OBJ_NAME_LEN - 1)); 96 attr.numa_node = create_attr->numa_node; 97 attr.btf_fd = create_attr->btf_fd; 98 attr.btf_key_type_id = create_attr->btf_key_type_id; 99 attr.btf_value_type_id = create_attr->btf_value_type_id; 100 attr.map_ifindex = create_attr->map_ifindex; 101 attr.inner_map_fd = create_attr->inner_map_fd; 102 103 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 104 } 105 106 int bpf_create_map_node(enum bpf_map_type map_type, const char *name, 107 int key_size, int value_size, int max_entries, 108 __u32 map_flags, int node) 109 { 110 struct bpf_create_map_attr map_attr = {}; 111 112 map_attr.name = name; 113 map_attr.map_type = map_type; 114 map_attr.map_flags = map_flags; 115 map_attr.key_size = key_size; 116 map_attr.value_size = value_size; 117 map_attr.max_entries = max_entries; 118 if (node >= 0) { 119 map_attr.numa_node = node; 120 map_attr.map_flags |= BPF_F_NUMA_NODE; 121 } 122 123 return bpf_create_map_xattr(&map_attr); 124 } 125 126 int bpf_create_map(enum bpf_map_type map_type, int key_size, 127 int value_size, int max_entries, __u32 map_flags) 128 { 129 struct bpf_create_map_attr map_attr = {}; 130 131 map_attr.map_type = map_type; 132 map_attr.map_flags = map_flags; 133 map_attr.key_size = key_size; 134 map_attr.value_size = value_size; 135 map_attr.max_entries = max_entries; 136 137 return bpf_create_map_xattr(&map_attr); 138 } 139 140 int bpf_create_map_name(enum bpf_map_type map_type, const char *name, 141 int key_size, int value_size, int max_entries, 142 __u32 map_flags) 143 { 144 struct bpf_create_map_attr map_attr = {}; 145 146 map_attr.name = name; 147 map_attr.map_type = map_type; 148 map_attr.map_flags = map_flags; 149 map_attr.key_size = key_size; 150 map_attr.value_size = value_size; 151 map_attr.max_entries = max_entries; 152 153 return bpf_create_map_xattr(&map_attr); 154 } 155 156 int bpf_create_map_in_map_node(enum bpf_map_type map_type, const char *name, 157 int key_size, int inner_map_fd, int max_entries, 158 __u32 map_flags, int node) 159 { 160 union bpf_attr attr; 161 162 memset(&attr, '\0', sizeof(attr)); 163 164 attr.map_type = map_type; 165 attr.key_size = key_size; 166 attr.value_size = 4; 167 attr.inner_map_fd = inner_map_fd; 168 attr.max_entries = max_entries; 169 attr.map_flags = map_flags; 170 if (name) 171 memcpy(attr.map_name, name, 172 min(strlen(name), BPF_OBJ_NAME_LEN - 1)); 173 174 if (node >= 0) { 175 attr.map_flags |= BPF_F_NUMA_NODE; 176 attr.numa_node = node; 177 } 178 179 return sys_bpf(BPF_MAP_CREATE, &attr, sizeof(attr)); 180 } 181 182 int bpf_create_map_in_map(enum bpf_map_type map_type, const char *name, 183 int key_size, int inner_map_fd, int max_entries, 184 __u32 map_flags) 185 { 186 return bpf_create_map_in_map_node(map_type, name, key_size, 187 inner_map_fd, max_entries, map_flags, 188 -1); 189 } 190 191 static void * 192 alloc_zero_tailing_info(const void *orecord, __u32 cnt, 193 __u32 actual_rec_size, __u32 expected_rec_size) 194 { 195 __u64 info_len = actual_rec_size * cnt; 196 void *info, *nrecord; 197 int i; 198 199 info = malloc(info_len); 200 if (!info) 201 return NULL; 202 203 /* zero out bytes kernel does not understand */ 204 nrecord = info; 205 for (i = 0; i < cnt; i++) { 206 memcpy(nrecord, orecord, expected_rec_size); 207 memset(nrecord + expected_rec_size, 0, 208 actual_rec_size - expected_rec_size); 209 orecord += actual_rec_size; 210 nrecord += actual_rec_size; 211 } 212 213 return info; 214 } 215 216 int bpf_load_program_xattr(const struct bpf_load_program_attr *load_attr, 217 char *log_buf, size_t log_buf_sz) 218 { 219 void *finfo = NULL, *linfo = NULL; 220 union bpf_attr attr; 221 __u32 log_level; 222 int fd; 223 224 if (!load_attr || !log_buf != !log_buf_sz) 225 return -EINVAL; 226 227 log_level = load_attr->log_level; 228 if (log_level > (4 | 2 | 1) || (log_level && !log_buf)) 229 return -EINVAL; 230 231 memset(&attr, 0, sizeof(attr)); 232 attr.prog_type = load_attr->prog_type; 233 attr.expected_attach_type = load_attr->expected_attach_type; 234 attr.insn_cnt = (__u32)load_attr->insns_cnt; 235 attr.insns = ptr_to_u64(load_attr->insns); 236 attr.license = ptr_to_u64(load_attr->license); 237 238 attr.log_level = log_level; 239 if (log_level) { 240 attr.log_buf = ptr_to_u64(log_buf); 241 attr.log_size = log_buf_sz; 242 } else { 243 attr.log_buf = ptr_to_u64(NULL); 244 attr.log_size = 0; 245 } 246 247 attr.kern_version = load_attr->kern_version; 248 attr.prog_ifindex = load_attr->prog_ifindex; 249 attr.prog_btf_fd = load_attr->prog_btf_fd; 250 attr.func_info_rec_size = load_attr->func_info_rec_size; 251 attr.func_info_cnt = load_attr->func_info_cnt; 252 attr.func_info = ptr_to_u64(load_attr->func_info); 253 attr.line_info_rec_size = load_attr->line_info_rec_size; 254 attr.line_info_cnt = load_attr->line_info_cnt; 255 attr.line_info = ptr_to_u64(load_attr->line_info); 256 if (load_attr->name) 257 memcpy(attr.prog_name, load_attr->name, 258 min(strlen(load_attr->name), BPF_OBJ_NAME_LEN - 1)); 259 260 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 261 if (fd >= 0) 262 return fd; 263 264 /* After bpf_prog_load, the kernel may modify certain attributes 265 * to give user space a hint how to deal with loading failure. 266 * Check to see whether we can make some changes and load again. 267 */ 268 while (errno == E2BIG && (!finfo || !linfo)) { 269 if (!finfo && attr.func_info_cnt && 270 attr.func_info_rec_size < load_attr->func_info_rec_size) { 271 /* try with corrected func info records */ 272 finfo = alloc_zero_tailing_info(load_attr->func_info, 273 load_attr->func_info_cnt, 274 load_attr->func_info_rec_size, 275 attr.func_info_rec_size); 276 if (!finfo) 277 goto done; 278 279 attr.func_info = ptr_to_u64(finfo); 280 attr.func_info_rec_size = load_attr->func_info_rec_size; 281 } else if (!linfo && attr.line_info_cnt && 282 attr.line_info_rec_size < 283 load_attr->line_info_rec_size) { 284 linfo = alloc_zero_tailing_info(load_attr->line_info, 285 load_attr->line_info_cnt, 286 load_attr->line_info_rec_size, 287 attr.line_info_rec_size); 288 if (!linfo) 289 goto done; 290 291 attr.line_info = ptr_to_u64(linfo); 292 attr.line_info_rec_size = load_attr->line_info_rec_size; 293 } else { 294 break; 295 } 296 297 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 298 299 if (fd >= 0) 300 goto done; 301 } 302 303 if (log_level || !log_buf) 304 goto done; 305 306 /* Try again with log */ 307 attr.log_buf = ptr_to_u64(log_buf); 308 attr.log_size = log_buf_sz; 309 attr.log_level = 1; 310 log_buf[0] = 0; 311 fd = sys_bpf_prog_load(&attr, sizeof(attr)); 312 done: 313 free(finfo); 314 free(linfo); 315 return fd; 316 } 317 318 int bpf_load_program(enum bpf_prog_type type, const struct bpf_insn *insns, 319 size_t insns_cnt, const char *license, 320 __u32 kern_version, char *log_buf, 321 size_t log_buf_sz) 322 { 323 struct bpf_load_program_attr load_attr; 324 325 memset(&load_attr, 0, sizeof(struct bpf_load_program_attr)); 326 load_attr.prog_type = type; 327 load_attr.expected_attach_type = 0; 328 load_attr.name = NULL; 329 load_attr.insns = insns; 330 load_attr.insns_cnt = insns_cnt; 331 load_attr.license = license; 332 load_attr.kern_version = kern_version; 333 334 return bpf_load_program_xattr(&load_attr, log_buf, log_buf_sz); 335 } 336 337 int bpf_verify_program(enum bpf_prog_type type, const struct bpf_insn *insns, 338 size_t insns_cnt, __u32 prog_flags, const char *license, 339 __u32 kern_version, char *log_buf, size_t log_buf_sz, 340 int log_level) 341 { 342 union bpf_attr attr; 343 344 memset(&attr, 0, sizeof(attr)); 345 attr.prog_type = type; 346 attr.insn_cnt = (__u32)insns_cnt; 347 attr.insns = ptr_to_u64(insns); 348 attr.license = ptr_to_u64(license); 349 attr.log_buf = ptr_to_u64(log_buf); 350 attr.log_size = log_buf_sz; 351 attr.log_level = log_level; 352 log_buf[0] = 0; 353 attr.kern_version = kern_version; 354 attr.prog_flags = prog_flags; 355 356 return sys_bpf_prog_load(&attr, sizeof(attr)); 357 } 358 359 int bpf_map_update_elem(int fd, const void *key, const void *value, 360 __u64 flags) 361 { 362 union bpf_attr attr; 363 364 memset(&attr, 0, sizeof(attr)); 365 attr.map_fd = fd; 366 attr.key = ptr_to_u64(key); 367 attr.value = ptr_to_u64(value); 368 attr.flags = flags; 369 370 return sys_bpf(BPF_MAP_UPDATE_ELEM, &attr, sizeof(attr)); 371 } 372 373 int bpf_map_lookup_elem(int fd, const void *key, void *value) 374 { 375 union bpf_attr attr; 376 377 memset(&attr, 0, sizeof(attr)); 378 attr.map_fd = fd; 379 attr.key = ptr_to_u64(key); 380 attr.value = ptr_to_u64(value); 381 382 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 383 } 384 385 int bpf_map_lookup_elem_flags(int fd, const void *key, void *value, __u64 flags) 386 { 387 union bpf_attr attr; 388 389 memset(&attr, 0, sizeof(attr)); 390 attr.map_fd = fd; 391 attr.key = ptr_to_u64(key); 392 attr.value = ptr_to_u64(value); 393 attr.flags = flags; 394 395 return sys_bpf(BPF_MAP_LOOKUP_ELEM, &attr, sizeof(attr)); 396 } 397 398 int bpf_map_lookup_and_delete_elem(int fd, const void *key, void *value) 399 { 400 union bpf_attr attr; 401 402 memset(&attr, 0, sizeof(attr)); 403 attr.map_fd = fd; 404 attr.key = ptr_to_u64(key); 405 attr.value = ptr_to_u64(value); 406 407 return sys_bpf(BPF_MAP_LOOKUP_AND_DELETE_ELEM, &attr, sizeof(attr)); 408 } 409 410 int bpf_map_delete_elem(int fd, const void *key) 411 { 412 union bpf_attr attr; 413 414 memset(&attr, 0, sizeof(attr)); 415 attr.map_fd = fd; 416 attr.key = ptr_to_u64(key); 417 418 return sys_bpf(BPF_MAP_DELETE_ELEM, &attr, sizeof(attr)); 419 } 420 421 int bpf_map_get_next_key(int fd, const void *key, void *next_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 attr.next_key = ptr_to_u64(next_key); 429 430 return sys_bpf(BPF_MAP_GET_NEXT_KEY, &attr, sizeof(attr)); 431 } 432 433 int bpf_map_freeze(int fd) 434 { 435 union bpf_attr attr; 436 437 memset(&attr, 0, sizeof(attr)); 438 attr.map_fd = fd; 439 440 return sys_bpf(BPF_MAP_FREEZE, &attr, sizeof(attr)); 441 } 442 443 int bpf_obj_pin(int fd, const char *pathname) 444 { 445 union bpf_attr attr; 446 447 memset(&attr, 0, sizeof(attr)); 448 attr.pathname = ptr_to_u64((void *)pathname); 449 attr.bpf_fd = fd; 450 451 return sys_bpf(BPF_OBJ_PIN, &attr, sizeof(attr)); 452 } 453 454 int bpf_obj_get(const char *pathname) 455 { 456 union bpf_attr attr; 457 458 memset(&attr, 0, sizeof(attr)); 459 attr.pathname = ptr_to_u64((void *)pathname); 460 461 return sys_bpf(BPF_OBJ_GET, &attr, sizeof(attr)); 462 } 463 464 int bpf_prog_attach(int prog_fd, int target_fd, enum bpf_attach_type type, 465 unsigned int flags) 466 { 467 union bpf_attr attr; 468 469 memset(&attr, 0, sizeof(attr)); 470 attr.target_fd = target_fd; 471 attr.attach_bpf_fd = prog_fd; 472 attr.attach_type = type; 473 attr.attach_flags = flags; 474 475 return sys_bpf(BPF_PROG_ATTACH, &attr, sizeof(attr)); 476 } 477 478 int bpf_prog_detach(int target_fd, enum bpf_attach_type type) 479 { 480 union bpf_attr attr; 481 482 memset(&attr, 0, sizeof(attr)); 483 attr.target_fd = target_fd; 484 attr.attach_type = type; 485 486 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 487 } 488 489 int bpf_prog_detach2(int prog_fd, int target_fd, enum bpf_attach_type type) 490 { 491 union bpf_attr attr; 492 493 memset(&attr, 0, sizeof(attr)); 494 attr.target_fd = target_fd; 495 attr.attach_bpf_fd = prog_fd; 496 attr.attach_type = type; 497 498 return sys_bpf(BPF_PROG_DETACH, &attr, sizeof(attr)); 499 } 500 501 int bpf_prog_query(int target_fd, enum bpf_attach_type type, __u32 query_flags, 502 __u32 *attach_flags, __u32 *prog_ids, __u32 *prog_cnt) 503 { 504 union bpf_attr attr; 505 int ret; 506 507 memset(&attr, 0, sizeof(attr)); 508 attr.query.target_fd = target_fd; 509 attr.query.attach_type = type; 510 attr.query.query_flags = query_flags; 511 attr.query.prog_cnt = *prog_cnt; 512 attr.query.prog_ids = ptr_to_u64(prog_ids); 513 514 ret = sys_bpf(BPF_PROG_QUERY, &attr, sizeof(attr)); 515 if (attach_flags) 516 *attach_flags = attr.query.attach_flags; 517 *prog_cnt = attr.query.prog_cnt; 518 return ret; 519 } 520 521 int bpf_prog_test_run(int prog_fd, int repeat, void *data, __u32 size, 522 void *data_out, __u32 *size_out, __u32 *retval, 523 __u32 *duration) 524 { 525 union bpf_attr attr; 526 int ret; 527 528 memset(&attr, 0, sizeof(attr)); 529 attr.test.prog_fd = prog_fd; 530 attr.test.data_in = ptr_to_u64(data); 531 attr.test.data_out = ptr_to_u64(data_out); 532 attr.test.data_size_in = size; 533 attr.test.repeat = repeat; 534 535 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 536 if (size_out) 537 *size_out = attr.test.data_size_out; 538 if (retval) 539 *retval = attr.test.retval; 540 if (duration) 541 *duration = attr.test.duration; 542 return ret; 543 } 544 545 int bpf_prog_test_run_xattr(struct bpf_prog_test_run_attr *test_attr) 546 { 547 union bpf_attr attr; 548 int ret; 549 550 if (!test_attr->data_out && test_attr->data_size_out > 0) 551 return -EINVAL; 552 553 memset(&attr, 0, sizeof(attr)); 554 attr.test.prog_fd = test_attr->prog_fd; 555 attr.test.data_in = ptr_to_u64(test_attr->data_in); 556 attr.test.data_out = ptr_to_u64(test_attr->data_out); 557 attr.test.data_size_in = test_attr->data_size_in; 558 attr.test.data_size_out = test_attr->data_size_out; 559 attr.test.ctx_in = ptr_to_u64(test_attr->ctx_in); 560 attr.test.ctx_out = ptr_to_u64(test_attr->ctx_out); 561 attr.test.ctx_size_in = test_attr->ctx_size_in; 562 attr.test.ctx_size_out = test_attr->ctx_size_out; 563 attr.test.repeat = test_attr->repeat; 564 565 ret = sys_bpf(BPF_PROG_TEST_RUN, &attr, sizeof(attr)); 566 test_attr->data_size_out = attr.test.data_size_out; 567 test_attr->ctx_size_out = attr.test.ctx_size_out; 568 test_attr->retval = attr.test.retval; 569 test_attr->duration = attr.test.duration; 570 return ret; 571 } 572 573 int bpf_prog_get_next_id(__u32 start_id, __u32 *next_id) 574 { 575 union bpf_attr attr; 576 int err; 577 578 memset(&attr, 0, sizeof(attr)); 579 attr.start_id = start_id; 580 581 err = sys_bpf(BPF_PROG_GET_NEXT_ID, &attr, sizeof(attr)); 582 if (!err) 583 *next_id = attr.next_id; 584 585 return err; 586 } 587 588 int bpf_map_get_next_id(__u32 start_id, __u32 *next_id) 589 { 590 union bpf_attr attr; 591 int err; 592 593 memset(&attr, 0, sizeof(attr)); 594 attr.start_id = start_id; 595 596 err = sys_bpf(BPF_MAP_GET_NEXT_ID, &attr, sizeof(attr)); 597 if (!err) 598 *next_id = attr.next_id; 599 600 return err; 601 } 602 603 int bpf_prog_get_fd_by_id(__u32 id) 604 { 605 union bpf_attr attr; 606 607 memset(&attr, 0, sizeof(attr)); 608 attr.prog_id = id; 609 610 return sys_bpf(BPF_PROG_GET_FD_BY_ID, &attr, sizeof(attr)); 611 } 612 613 int bpf_map_get_fd_by_id(__u32 id) 614 { 615 union bpf_attr attr; 616 617 memset(&attr, 0, sizeof(attr)); 618 attr.map_id = id; 619 620 return sys_bpf(BPF_MAP_GET_FD_BY_ID, &attr, sizeof(attr)); 621 } 622 623 int bpf_btf_get_fd_by_id(__u32 id) 624 { 625 union bpf_attr attr; 626 627 memset(&attr, 0, sizeof(attr)); 628 attr.btf_id = id; 629 630 return sys_bpf(BPF_BTF_GET_FD_BY_ID, &attr, sizeof(attr)); 631 } 632 633 int bpf_obj_get_info_by_fd(int prog_fd, void *info, __u32 *info_len) 634 { 635 union bpf_attr attr; 636 int err; 637 638 memset(&attr, 0, sizeof(attr)); 639 attr.info.bpf_fd = prog_fd; 640 attr.info.info_len = *info_len; 641 attr.info.info = ptr_to_u64(info); 642 643 err = sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &attr, sizeof(attr)); 644 if (!err) 645 *info_len = attr.info.info_len; 646 647 return err; 648 } 649 650 int bpf_raw_tracepoint_open(const char *name, int prog_fd) 651 { 652 union bpf_attr attr; 653 654 memset(&attr, 0, sizeof(attr)); 655 attr.raw_tracepoint.name = ptr_to_u64(name); 656 attr.raw_tracepoint.prog_fd = prog_fd; 657 658 return sys_bpf(BPF_RAW_TRACEPOINT_OPEN, &attr, sizeof(attr)); 659 } 660 661 int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, __u32 log_buf_size, 662 bool do_log) 663 { 664 union bpf_attr attr = {}; 665 int fd; 666 667 attr.btf = ptr_to_u64(btf); 668 attr.btf_size = btf_size; 669 670 retry: 671 if (do_log && log_buf && log_buf_size) { 672 attr.btf_log_level = 1; 673 attr.btf_log_size = log_buf_size; 674 attr.btf_log_buf = ptr_to_u64(log_buf); 675 } 676 677 fd = sys_bpf(BPF_BTF_LOAD, &attr, sizeof(attr)); 678 if (fd == -1 && !do_log && log_buf && log_buf_size) { 679 do_log = true; 680 goto retry; 681 } 682 683 return fd; 684 } 685 686 int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, 687 __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, 688 __u64 *probe_addr) 689 { 690 union bpf_attr attr = {}; 691 int err; 692 693 attr.task_fd_query.pid = pid; 694 attr.task_fd_query.fd = fd; 695 attr.task_fd_query.flags = flags; 696 attr.task_fd_query.buf = ptr_to_u64(buf); 697 attr.task_fd_query.buf_len = *buf_len; 698 699 err = sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 700 *buf_len = attr.task_fd_query.buf_len; 701 *prog_id = attr.task_fd_query.prog_id; 702 *fd_type = attr.task_fd_query.fd_type; 703 *probe_offset = attr.task_fd_query.probe_offset; 704 *probe_addr = attr.task_fd_query.probe_addr; 705 706 return err; 707 } 708