1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 3 4 #include <errno.h> 5 #include <fcntl.h> 6 #include <linux/err.h> 7 #include <linux/kernel.h> 8 #include <net/if.h> 9 #include <stdbool.h> 10 #include <stdio.h> 11 #include <stdlib.h> 12 #include <string.h> 13 #include <unistd.h> 14 #include <sys/types.h> 15 #include <sys/stat.h> 16 17 #include <bpf/bpf.h> 18 #include <bpf/btf.h> 19 #include <bpf/hashmap.h> 20 21 #include "json_writer.h" 22 #include "main.h" 23 24 static struct hashmap *map_table; 25 26 static bool map_is_per_cpu(__u32 type) 27 { 28 return type == BPF_MAP_TYPE_PERCPU_HASH || 29 type == BPF_MAP_TYPE_PERCPU_ARRAY || 30 type == BPF_MAP_TYPE_LRU_PERCPU_HASH || 31 type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE; 32 } 33 34 static bool map_is_map_of_maps(__u32 type) 35 { 36 return type == BPF_MAP_TYPE_ARRAY_OF_MAPS || 37 type == BPF_MAP_TYPE_HASH_OF_MAPS; 38 } 39 40 static bool map_is_map_of_progs(__u32 type) 41 { 42 return type == BPF_MAP_TYPE_PROG_ARRAY; 43 } 44 45 static int map_type_from_str(const char *type) 46 { 47 const char *map_type_str; 48 unsigned int i; 49 50 for (i = 0; ; i++) { 51 map_type_str = libbpf_bpf_map_type_str(i); 52 if (!map_type_str) 53 break; 54 55 /* Don't allow prefixing in case of possible future shadowing */ 56 if (!strcmp(map_type_str, type)) 57 return i; 58 } 59 return -1; 60 } 61 62 static void *alloc_value(struct bpf_map_info *info) 63 { 64 if (map_is_per_cpu(info->type)) 65 return malloc(round_up(info->value_size, 8) * 66 get_possible_cpus()); 67 else 68 return malloc(info->value_size); 69 } 70 71 static int do_dump_btf(const struct btf_dumper *d, 72 struct bpf_map_info *map_info, void *key, 73 void *value) 74 { 75 __u32 value_id; 76 int ret = 0; 77 78 /* start of key-value pair */ 79 jsonw_start_object(d->jw); 80 81 if (map_info->btf_key_type_id) { 82 jsonw_name(d->jw, "key"); 83 84 ret = btf_dumper_type(d, map_info->btf_key_type_id, key); 85 if (ret) 86 goto err_end_obj; 87 } 88 89 value_id = map_info->btf_vmlinux_value_type_id ? 90 : map_info->btf_value_type_id; 91 92 if (!map_is_per_cpu(map_info->type)) { 93 jsonw_name(d->jw, "value"); 94 ret = btf_dumper_type(d, value_id, value); 95 } else { 96 unsigned int i, n, step; 97 98 jsonw_name(d->jw, "values"); 99 jsonw_start_array(d->jw); 100 n = get_possible_cpus(); 101 step = round_up(map_info->value_size, 8); 102 for (i = 0; i < n; i++) { 103 jsonw_start_object(d->jw); 104 jsonw_int_field(d->jw, "cpu", i); 105 jsonw_name(d->jw, "value"); 106 ret = btf_dumper_type(d, value_id, value + i * step); 107 jsonw_end_object(d->jw); 108 if (ret) 109 break; 110 } 111 jsonw_end_array(d->jw); 112 } 113 114 err_end_obj: 115 /* end of key-value pair */ 116 jsonw_end_object(d->jw); 117 118 return ret; 119 } 120 121 static json_writer_t *get_btf_writer(void) 122 { 123 json_writer_t *jw = jsonw_new(stdout); 124 125 if (!jw) 126 return NULL; 127 jsonw_pretty(jw, true); 128 129 return jw; 130 } 131 132 static void print_entry_json(struct bpf_map_info *info, unsigned char *key, 133 unsigned char *value, struct btf *btf) 134 { 135 jsonw_start_object(json_wtr); 136 137 if (!map_is_per_cpu(info->type)) { 138 jsonw_name(json_wtr, "key"); 139 print_hex_data_json(key, info->key_size); 140 jsonw_name(json_wtr, "value"); 141 print_hex_data_json(value, info->value_size); 142 if (map_is_map_of_maps(info->type)) 143 jsonw_uint_field(json_wtr, "inner_map_id", 144 *(unsigned int *)value); 145 if (btf) { 146 struct btf_dumper d = { 147 .btf = btf, 148 .jw = json_wtr, 149 .is_plain_text = false, 150 }; 151 152 jsonw_name(json_wtr, "formatted"); 153 do_dump_btf(&d, info, key, value); 154 } 155 } else { 156 unsigned int i, n, step; 157 158 n = get_possible_cpus(); 159 step = round_up(info->value_size, 8); 160 161 jsonw_name(json_wtr, "key"); 162 print_hex_data_json(key, info->key_size); 163 164 jsonw_name(json_wtr, "values"); 165 jsonw_start_array(json_wtr); 166 for (i = 0; i < n; i++) { 167 jsonw_start_object(json_wtr); 168 169 jsonw_int_field(json_wtr, "cpu", i); 170 171 jsonw_name(json_wtr, "value"); 172 print_hex_data_json(value + i * step, 173 info->value_size); 174 175 jsonw_end_object(json_wtr); 176 } 177 jsonw_end_array(json_wtr); 178 if (btf) { 179 struct btf_dumper d = { 180 .btf = btf, 181 .jw = json_wtr, 182 .is_plain_text = false, 183 }; 184 185 jsonw_name(json_wtr, "formatted"); 186 do_dump_btf(&d, info, key, value); 187 } 188 } 189 190 jsonw_end_object(json_wtr); 191 } 192 193 static void 194 print_entry_error_msg(struct bpf_map_info *info, unsigned char *key, 195 const char *error_msg) 196 { 197 int msg_size = strlen(error_msg); 198 bool single_line, break_names; 199 200 break_names = info->key_size > 16 || msg_size > 16; 201 single_line = info->key_size + msg_size <= 24 && !break_names; 202 203 printf("key:%c", break_names ? '\n' : ' '); 204 fprint_hex(stdout, key, info->key_size, " "); 205 206 printf(single_line ? " " : "\n"); 207 208 printf("value:%c%s", break_names ? '\n' : ' ', error_msg); 209 210 printf("\n"); 211 } 212 213 static void 214 print_entry_error(struct bpf_map_info *map_info, void *key, int lookup_errno) 215 { 216 /* For prog_array maps or arrays of maps, failure to lookup the value 217 * means there is no entry for that key. Do not print an error message 218 * in that case. 219 */ 220 if ((map_is_map_of_maps(map_info->type) || 221 map_is_map_of_progs(map_info->type)) && lookup_errno == ENOENT) 222 return; 223 224 if (json_output) { 225 jsonw_start_object(json_wtr); /* entry */ 226 jsonw_name(json_wtr, "key"); 227 print_hex_data_json(key, map_info->key_size); 228 jsonw_name(json_wtr, "value"); 229 jsonw_start_object(json_wtr); /* error */ 230 jsonw_string_field(json_wtr, "error", strerror(lookup_errno)); 231 jsonw_end_object(json_wtr); /* error */ 232 jsonw_end_object(json_wtr); /* entry */ 233 } else { 234 const char *msg = NULL; 235 236 if (lookup_errno == ENOENT) 237 msg = "<no entry>"; 238 else if (lookup_errno == ENOSPC && 239 map_info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY) 240 msg = "<cannot read>"; 241 242 print_entry_error_msg(map_info, key, 243 msg ? : strerror(lookup_errno)); 244 } 245 } 246 247 static void print_entry_plain(struct bpf_map_info *info, unsigned char *key, 248 unsigned char *value) 249 { 250 if (!map_is_per_cpu(info->type)) { 251 bool single_line, break_names; 252 253 break_names = info->key_size > 16 || info->value_size > 16; 254 single_line = info->key_size + info->value_size <= 24 && 255 !break_names; 256 257 if (info->key_size) { 258 printf("key:%c", break_names ? '\n' : ' '); 259 fprint_hex(stdout, key, info->key_size, " "); 260 261 printf(single_line ? " " : "\n"); 262 } 263 264 if (info->value_size) { 265 if (map_is_map_of_maps(info->type)) { 266 printf("inner_map_id:%c", break_names ? '\n' : ' '); 267 printf("%u ", *(unsigned int *)value); 268 } else { 269 printf("value:%c", break_names ? '\n' : ' '); 270 fprint_hex(stdout, value, info->value_size, " "); 271 } 272 } 273 274 printf("\n"); 275 } else { 276 unsigned int i, n, step; 277 278 n = get_possible_cpus(); 279 step = round_up(info->value_size, 8); 280 281 if (info->key_size) { 282 printf("key:\n"); 283 fprint_hex(stdout, key, info->key_size, " "); 284 printf("\n"); 285 } 286 if (info->value_size) { 287 for (i = 0; i < n; i++) { 288 printf("value (CPU %02d):%c", 289 i, info->value_size > 16 ? '\n' : ' '); 290 fprint_hex(stdout, value + i * step, 291 info->value_size, " "); 292 printf("\n"); 293 } 294 } 295 } 296 } 297 298 static char **parse_bytes(char **argv, const char *name, unsigned char *val, 299 unsigned int n) 300 { 301 unsigned int i = 0, base = 0; 302 char *endptr; 303 304 if (is_prefix(*argv, "hex")) { 305 base = 16; 306 argv++; 307 } 308 309 while (i < n && argv[i]) { 310 val[i] = strtoul(argv[i], &endptr, base); 311 if (*endptr) { 312 p_err("error parsing byte: %s", argv[i]); 313 return NULL; 314 } 315 i++; 316 } 317 318 if (i != n) { 319 p_err("%s expected %d bytes got %d", name, n, i); 320 return NULL; 321 } 322 323 return argv + i; 324 } 325 326 /* on per cpu maps we must copy the provided value on all value instances */ 327 static void fill_per_cpu_value(struct bpf_map_info *info, void *value) 328 { 329 unsigned int i, n, step; 330 331 if (!map_is_per_cpu(info->type)) 332 return; 333 334 n = get_possible_cpus(); 335 step = round_up(info->value_size, 8); 336 for (i = 1; i < n; i++) 337 memcpy(value + i * step, value, info->value_size); 338 } 339 340 static int parse_elem(char **argv, struct bpf_map_info *info, 341 void *key, void *value, __u32 key_size, __u32 value_size, 342 __u32 *flags, __u32 **value_fd) 343 { 344 if (!*argv) { 345 if (!key && !value) 346 return 0; 347 p_err("did not find %s", key ? "key" : "value"); 348 return -1; 349 } 350 351 if (is_prefix(*argv, "key")) { 352 if (!key) { 353 if (key_size) 354 p_err("duplicate key"); 355 else 356 p_err("unnecessary key"); 357 return -1; 358 } 359 360 argv = parse_bytes(argv + 1, "key", key, key_size); 361 if (!argv) 362 return -1; 363 364 return parse_elem(argv, info, NULL, value, key_size, value_size, 365 flags, value_fd); 366 } else if (is_prefix(*argv, "value")) { 367 int fd; 368 369 if (!value) { 370 if (value_size) 371 p_err("duplicate value"); 372 else 373 p_err("unnecessary value"); 374 return -1; 375 } 376 377 argv++; 378 379 if (map_is_map_of_maps(info->type)) { 380 int argc = 2; 381 382 if (value_size != 4) { 383 p_err("value smaller than 4B for map in map?"); 384 return -1; 385 } 386 if (!argv[0] || !argv[1]) { 387 p_err("not enough value arguments for map in map"); 388 return -1; 389 } 390 391 fd = map_parse_fd(&argc, &argv); 392 if (fd < 0) 393 return -1; 394 395 *value_fd = value; 396 **value_fd = fd; 397 } else if (map_is_map_of_progs(info->type)) { 398 int argc = 2; 399 400 if (value_size != 4) { 401 p_err("value smaller than 4B for map of progs?"); 402 return -1; 403 } 404 if (!argv[0] || !argv[1]) { 405 p_err("not enough value arguments for map of progs"); 406 return -1; 407 } 408 if (is_prefix(*argv, "id")) 409 p_info("Warning: updating program array via MAP_ID, make sure this map is kept open\n" 410 " by some process or pinned otherwise update will be lost"); 411 412 fd = prog_parse_fd(&argc, &argv); 413 if (fd < 0) 414 return -1; 415 416 *value_fd = value; 417 **value_fd = fd; 418 } else { 419 argv = parse_bytes(argv, "value", value, value_size); 420 if (!argv) 421 return -1; 422 423 fill_per_cpu_value(info, value); 424 } 425 426 return parse_elem(argv, info, key, NULL, key_size, value_size, 427 flags, NULL); 428 } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") || 429 is_prefix(*argv, "exist")) { 430 if (!flags) { 431 p_err("flags specified multiple times: %s", *argv); 432 return -1; 433 } 434 435 if (is_prefix(*argv, "any")) 436 *flags = BPF_ANY; 437 else if (is_prefix(*argv, "noexist")) 438 *flags = BPF_NOEXIST; 439 else if (is_prefix(*argv, "exist")) 440 *flags = BPF_EXIST; 441 442 return parse_elem(argv + 1, info, key, value, key_size, 443 value_size, NULL, value_fd); 444 } 445 446 p_err("expected key or value, got: %s", *argv); 447 return -1; 448 } 449 450 static void show_map_header_json(struct bpf_map_info *info, json_writer_t *wtr) 451 { 452 const char *map_type_str; 453 454 jsonw_uint_field(wtr, "id", info->id); 455 map_type_str = libbpf_bpf_map_type_str(info->type); 456 if (map_type_str) 457 jsonw_string_field(wtr, "type", map_type_str); 458 else 459 jsonw_uint_field(wtr, "type", info->type); 460 461 if (*info->name) 462 jsonw_string_field(wtr, "name", info->name); 463 464 jsonw_name(wtr, "flags"); 465 jsonw_printf(wtr, "%d", info->map_flags); 466 } 467 468 static int show_map_close_json(int fd, struct bpf_map_info *info) 469 { 470 char *memlock, *frozen_str; 471 int frozen = 0; 472 473 memlock = get_fdinfo(fd, "memlock"); 474 frozen_str = get_fdinfo(fd, "frozen"); 475 476 jsonw_start_object(json_wtr); 477 478 show_map_header_json(info, json_wtr); 479 480 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino); 481 482 jsonw_uint_field(json_wtr, "bytes_key", info->key_size); 483 jsonw_uint_field(json_wtr, "bytes_value", info->value_size); 484 jsonw_uint_field(json_wtr, "max_entries", info->max_entries); 485 486 if (memlock) 487 jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock)); 488 free(memlock); 489 490 if (info->type == BPF_MAP_TYPE_PROG_ARRAY) { 491 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type"); 492 char *owner_jited = get_fdinfo(fd, "owner_jited"); 493 494 if (owner_prog_type) { 495 unsigned int prog_type = atoi(owner_prog_type); 496 const char *prog_type_str; 497 498 prog_type_str = libbpf_bpf_prog_type_str(prog_type); 499 if (prog_type_str) 500 jsonw_string_field(json_wtr, "owner_prog_type", 501 prog_type_str); 502 else 503 jsonw_uint_field(json_wtr, "owner_prog_type", 504 prog_type); 505 } 506 if (owner_jited) 507 jsonw_bool_field(json_wtr, "owner_jited", 508 !!atoi(owner_jited)); 509 510 free(owner_prog_type); 511 free(owner_jited); 512 } 513 close(fd); 514 515 if (frozen_str) { 516 frozen = atoi(frozen_str); 517 free(frozen_str); 518 } 519 jsonw_int_field(json_wtr, "frozen", frozen); 520 521 if (info->btf_id) 522 jsonw_int_field(json_wtr, "btf_id", info->btf_id); 523 524 if (!hashmap__empty(map_table)) { 525 struct hashmap_entry *entry; 526 527 jsonw_name(json_wtr, "pinned"); 528 jsonw_start_array(json_wtr); 529 hashmap__for_each_key_entry(map_table, entry, info->id) 530 jsonw_string(json_wtr, entry->pvalue); 531 jsonw_end_array(json_wtr); 532 } 533 534 emit_obj_refs_json(refs_table, info->id, json_wtr); 535 536 jsonw_end_object(json_wtr); 537 538 return 0; 539 } 540 541 static void show_map_header_plain(struct bpf_map_info *info) 542 { 543 const char *map_type_str; 544 545 printf("%u: ", info->id); 546 547 map_type_str = libbpf_bpf_map_type_str(info->type); 548 if (map_type_str) 549 printf("%s ", map_type_str); 550 else 551 printf("type %u ", info->type); 552 553 if (*info->name) 554 printf("name %s ", info->name); 555 556 printf("flags 0x%x", info->map_flags); 557 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino); 558 printf("\n"); 559 } 560 561 static int show_map_close_plain(int fd, struct bpf_map_info *info) 562 { 563 char *memlock, *frozen_str; 564 int frozen = 0; 565 566 memlock = get_fdinfo(fd, "memlock"); 567 frozen_str = get_fdinfo(fd, "frozen"); 568 569 show_map_header_plain(info); 570 printf("\tkey %uB value %uB max_entries %u", 571 info->key_size, info->value_size, info->max_entries); 572 573 if (memlock) 574 printf(" memlock %sB", memlock); 575 free(memlock); 576 577 if (info->type == BPF_MAP_TYPE_PROG_ARRAY) { 578 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type"); 579 char *owner_jited = get_fdinfo(fd, "owner_jited"); 580 581 if (owner_prog_type || owner_jited) 582 printf("\n\t"); 583 if (owner_prog_type) { 584 unsigned int prog_type = atoi(owner_prog_type); 585 const char *prog_type_str; 586 587 prog_type_str = libbpf_bpf_prog_type_str(prog_type); 588 if (prog_type_str) 589 printf("owner_prog_type %s ", prog_type_str); 590 else 591 printf("owner_prog_type %d ", prog_type); 592 } 593 if (owner_jited) 594 printf("owner%s jited", 595 atoi(owner_jited) ? "" : " not"); 596 597 free(owner_prog_type); 598 free(owner_jited); 599 } 600 close(fd); 601 602 if (!hashmap__empty(map_table)) { 603 struct hashmap_entry *entry; 604 605 hashmap__for_each_key_entry(map_table, entry, info->id) 606 printf("\n\tpinned %s", (char *)entry->pvalue); 607 } 608 609 if (frozen_str) { 610 frozen = atoi(frozen_str); 611 free(frozen_str); 612 } 613 614 if (info->btf_id || frozen) 615 printf("\n\t"); 616 617 if (info->btf_id) 618 printf("btf_id %d", info->btf_id); 619 620 if (frozen) 621 printf("%sfrozen", info->btf_id ? " " : ""); 622 623 emit_obj_refs_plain(refs_table, info->id, "\n\tpids "); 624 625 printf("\n"); 626 return 0; 627 } 628 629 static int do_show_subset(int argc, char **argv) 630 { 631 struct bpf_map_info info = {}; 632 __u32 len = sizeof(info); 633 int *fds = NULL; 634 int nb_fds, i; 635 int err = -1; 636 637 fds = malloc(sizeof(int)); 638 if (!fds) { 639 p_err("mem alloc failed"); 640 return -1; 641 } 642 nb_fds = map_parse_fds(&argc, &argv, &fds); 643 if (nb_fds < 1) 644 goto exit_free; 645 646 if (json_output && nb_fds > 1) 647 jsonw_start_array(json_wtr); /* root array */ 648 for (i = 0; i < nb_fds; i++) { 649 err = bpf_map_get_info_by_fd(fds[i], &info, &len); 650 if (err) { 651 p_err("can't get map info: %s", 652 strerror(errno)); 653 for (; i < nb_fds; i++) 654 close(fds[i]); 655 break; 656 } 657 658 if (json_output) 659 show_map_close_json(fds[i], &info); 660 else 661 show_map_close_plain(fds[i], &info); 662 663 close(fds[i]); 664 } 665 if (json_output && nb_fds > 1) 666 jsonw_end_array(json_wtr); /* root array */ 667 668 exit_free: 669 free(fds); 670 return err; 671 } 672 673 static int do_show(int argc, char **argv) 674 { 675 struct bpf_map_info info = {}; 676 __u32 len = sizeof(info); 677 __u32 id = 0; 678 int err; 679 int fd; 680 681 if (show_pinned) { 682 map_table = hashmap__new(hash_fn_for_key_as_id, 683 equal_fn_for_key_as_id, NULL); 684 if (IS_ERR(map_table)) { 685 p_err("failed to create hashmap for pinned paths"); 686 return -1; 687 } 688 build_pinned_obj_table(map_table, BPF_OBJ_MAP); 689 } 690 build_obj_refs_table(&refs_table, BPF_OBJ_MAP); 691 692 if (argc == 2) 693 return do_show_subset(argc, argv); 694 695 if (argc) 696 return BAD_ARG(); 697 698 if (json_output) 699 jsonw_start_array(json_wtr); 700 while (true) { 701 err = bpf_map_get_next_id(id, &id); 702 if (err) { 703 if (errno == ENOENT) 704 break; 705 p_err("can't get next map: %s%s", strerror(errno), 706 errno == EINVAL ? " -- kernel too old?" : ""); 707 break; 708 } 709 710 fd = bpf_map_get_fd_by_id(id); 711 if (fd < 0) { 712 if (errno == ENOENT) 713 continue; 714 p_err("can't get map by id (%u): %s", 715 id, strerror(errno)); 716 break; 717 } 718 719 err = bpf_map_get_info_by_fd(fd, &info, &len); 720 if (err) { 721 p_err("can't get map info: %s", strerror(errno)); 722 close(fd); 723 break; 724 } 725 726 if (json_output) 727 show_map_close_json(fd, &info); 728 else 729 show_map_close_plain(fd, &info); 730 } 731 if (json_output) 732 jsonw_end_array(json_wtr); 733 734 delete_obj_refs_table(refs_table); 735 736 if (show_pinned) 737 delete_pinned_obj_table(map_table); 738 739 return errno == ENOENT ? 0 : -1; 740 } 741 742 static int dump_map_elem(int fd, void *key, void *value, 743 struct bpf_map_info *map_info, struct btf *btf, 744 json_writer_t *btf_wtr) 745 { 746 if (bpf_map_lookup_elem(fd, key, value)) { 747 print_entry_error(map_info, key, errno); 748 return -1; 749 } 750 751 if (json_output) { 752 print_entry_json(map_info, key, value, btf); 753 } else if (btf) { 754 struct btf_dumper d = { 755 .btf = btf, 756 .jw = btf_wtr, 757 .is_plain_text = true, 758 }; 759 760 do_dump_btf(&d, map_info, key, value); 761 } else { 762 print_entry_plain(map_info, key, value); 763 } 764 765 return 0; 766 } 767 768 static int maps_have_btf(int *fds, int nb_fds) 769 { 770 struct bpf_map_info info = {}; 771 __u32 len = sizeof(info); 772 int err, i; 773 774 for (i = 0; i < nb_fds; i++) { 775 err = bpf_map_get_info_by_fd(fds[i], &info, &len); 776 if (err) { 777 p_err("can't get map info: %s", strerror(errno)); 778 return -1; 779 } 780 781 if (!info.btf_id) 782 return 0; 783 } 784 785 return 1; 786 } 787 788 static struct btf *btf_vmlinux; 789 790 static int get_map_kv_btf(const struct bpf_map_info *info, struct btf **btf) 791 { 792 int err = 0; 793 794 if (info->btf_vmlinux_value_type_id) { 795 if (!btf_vmlinux) { 796 btf_vmlinux = libbpf_find_kernel_btf(); 797 if (!btf_vmlinux) { 798 p_err("failed to get kernel btf"); 799 return -errno; 800 } 801 } 802 *btf = btf_vmlinux; 803 } else if (info->btf_value_type_id) { 804 *btf = btf__load_from_kernel_by_id(info->btf_id); 805 if (!*btf) { 806 err = -errno; 807 p_err("failed to get btf"); 808 } 809 } else { 810 *btf = NULL; 811 } 812 813 return err; 814 } 815 816 static void free_map_kv_btf(struct btf *btf) 817 { 818 if (btf != btf_vmlinux) 819 btf__free(btf); 820 } 821 822 static int 823 map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr, 824 bool show_header) 825 { 826 void *key, *value, *prev_key; 827 unsigned int num_elems = 0; 828 struct btf *btf = NULL; 829 int err; 830 831 key = malloc(info->key_size); 832 value = alloc_value(info); 833 if (!key || !value) { 834 p_err("mem alloc failed"); 835 err = -1; 836 goto exit_free; 837 } 838 839 prev_key = NULL; 840 841 if (wtr) { 842 err = get_map_kv_btf(info, &btf); 843 if (err) { 844 goto exit_free; 845 } 846 847 if (show_header) { 848 jsonw_start_object(wtr); /* map object */ 849 show_map_header_json(info, wtr); 850 jsonw_name(wtr, "elements"); 851 } 852 jsonw_start_array(wtr); /* elements */ 853 } else if (show_header) { 854 show_map_header_plain(info); 855 } 856 857 if (info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY && 858 info->value_size != 8) { 859 const char *map_type_str; 860 861 map_type_str = libbpf_bpf_map_type_str(info->type); 862 p_info("Warning: cannot read values from %s map with value_size != 8", 863 map_type_str); 864 } 865 while (true) { 866 err = bpf_map_get_next_key(fd, prev_key, key); 867 if (err) { 868 if (errno == ENOENT) 869 err = 0; 870 break; 871 } 872 if (!dump_map_elem(fd, key, value, info, btf, wtr)) 873 num_elems++; 874 prev_key = key; 875 } 876 877 if (wtr) { 878 jsonw_end_array(wtr); /* elements */ 879 if (show_header) 880 jsonw_end_object(wtr); /* map object */ 881 } else { 882 printf("Found %u element%s\n", num_elems, 883 num_elems != 1 ? "s" : ""); 884 } 885 886 exit_free: 887 free(key); 888 free(value); 889 close(fd); 890 free_map_kv_btf(btf); 891 892 return err; 893 } 894 895 static int do_dump(int argc, char **argv) 896 { 897 json_writer_t *wtr = NULL, *btf_wtr = NULL; 898 struct bpf_map_info info = {}; 899 int nb_fds, i = 0; 900 __u32 len = sizeof(info); 901 int *fds = NULL; 902 int err = -1; 903 904 if (argc != 2) 905 usage(); 906 907 fds = malloc(sizeof(int)); 908 if (!fds) { 909 p_err("mem alloc failed"); 910 return -1; 911 } 912 nb_fds = map_parse_fds(&argc, &argv, &fds); 913 if (nb_fds < 1) 914 goto exit_free; 915 916 if (json_output) { 917 wtr = json_wtr; 918 } else { 919 int do_plain_btf; 920 921 do_plain_btf = maps_have_btf(fds, nb_fds); 922 if (do_plain_btf < 0) 923 goto exit_close; 924 925 if (do_plain_btf) { 926 btf_wtr = get_btf_writer(); 927 wtr = btf_wtr; 928 if (!btf_wtr) 929 p_info("failed to create json writer for btf. falling back to plain output"); 930 } 931 } 932 933 if (wtr && nb_fds > 1) 934 jsonw_start_array(wtr); /* root array */ 935 for (i = 0; i < nb_fds; i++) { 936 if (bpf_map_get_info_by_fd(fds[i], &info, &len)) { 937 p_err("can't get map info: %s", strerror(errno)); 938 break; 939 } 940 err = map_dump(fds[i], &info, wtr, nb_fds > 1); 941 if (!wtr && i != nb_fds - 1) 942 printf("\n"); 943 944 if (err) 945 break; 946 close(fds[i]); 947 } 948 if (wtr && nb_fds > 1) 949 jsonw_end_array(wtr); /* root array */ 950 951 if (btf_wtr) 952 jsonw_destroy(&btf_wtr); 953 exit_close: 954 for (; i < nb_fds; i++) 955 close(fds[i]); 956 exit_free: 957 free(fds); 958 btf__free(btf_vmlinux); 959 return err; 960 } 961 962 static int alloc_key_value(struct bpf_map_info *info, void **key, void **value) 963 { 964 *key = NULL; 965 *value = NULL; 966 967 if (info->key_size) { 968 *key = malloc(info->key_size); 969 if (!*key) { 970 p_err("key mem alloc failed"); 971 return -1; 972 } 973 } 974 975 if (info->value_size) { 976 *value = alloc_value(info); 977 if (!*value) { 978 p_err("value mem alloc failed"); 979 free(*key); 980 *key = NULL; 981 return -1; 982 } 983 } 984 985 return 0; 986 } 987 988 static int do_update(int argc, char **argv) 989 { 990 struct bpf_map_info info = {}; 991 __u32 len = sizeof(info); 992 __u32 *value_fd = NULL; 993 __u32 flags = BPF_ANY; 994 void *key, *value; 995 int fd, err; 996 997 if (argc < 2) 998 usage(); 999 1000 fd = map_parse_fd_and_info(&argc, &argv, &info, &len); 1001 if (fd < 0) 1002 return -1; 1003 1004 err = alloc_key_value(&info, &key, &value); 1005 if (err) 1006 goto exit_free; 1007 1008 err = parse_elem(argv, &info, key, value, info.key_size, 1009 info.value_size, &flags, &value_fd); 1010 if (err) 1011 goto exit_free; 1012 1013 err = bpf_map_update_elem(fd, key, value, flags); 1014 if (err) { 1015 p_err("update failed: %s", strerror(errno)); 1016 goto exit_free; 1017 } 1018 1019 exit_free: 1020 if (value_fd) 1021 close(*value_fd); 1022 free(key); 1023 free(value); 1024 close(fd); 1025 1026 if (!err && json_output) 1027 jsonw_null(json_wtr); 1028 return err; 1029 } 1030 1031 static void print_key_value(struct bpf_map_info *info, void *key, 1032 void *value) 1033 { 1034 json_writer_t *btf_wtr; 1035 struct btf *btf; 1036 1037 if (get_map_kv_btf(info, &btf)) 1038 return; 1039 1040 if (json_output) { 1041 print_entry_json(info, key, value, btf); 1042 } else if (btf) { 1043 /* if here json_wtr wouldn't have been initialised, 1044 * so let's create separate writer for btf 1045 */ 1046 btf_wtr = get_btf_writer(); 1047 if (!btf_wtr) { 1048 p_info("failed to create json writer for btf. falling back to plain output"); 1049 btf__free(btf); 1050 btf = NULL; 1051 print_entry_plain(info, key, value); 1052 } else { 1053 struct btf_dumper d = { 1054 .btf = btf, 1055 .jw = btf_wtr, 1056 .is_plain_text = true, 1057 }; 1058 1059 do_dump_btf(&d, info, key, value); 1060 jsonw_destroy(&btf_wtr); 1061 } 1062 } else { 1063 print_entry_plain(info, key, value); 1064 } 1065 btf__free(btf); 1066 } 1067 1068 static int do_lookup(int argc, char **argv) 1069 { 1070 struct bpf_map_info info = {}; 1071 __u32 len = sizeof(info); 1072 void *key, *value; 1073 int err; 1074 int fd; 1075 1076 if (argc < 2) 1077 usage(); 1078 1079 fd = map_parse_fd_and_info(&argc, &argv, &info, &len); 1080 if (fd < 0) 1081 return -1; 1082 1083 err = alloc_key_value(&info, &key, &value); 1084 if (err) 1085 goto exit_free; 1086 1087 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL); 1088 if (err) 1089 goto exit_free; 1090 1091 err = bpf_map_lookup_elem(fd, key, value); 1092 if (err) { 1093 if (errno == ENOENT) { 1094 if (json_output) { 1095 jsonw_null(json_wtr); 1096 } else { 1097 printf("key:\n"); 1098 fprint_hex(stdout, key, info.key_size, " "); 1099 printf("\n\nNot found\n"); 1100 } 1101 } else { 1102 p_err("lookup failed: %s", strerror(errno)); 1103 } 1104 1105 goto exit_free; 1106 } 1107 1108 /* here means bpf_map_lookup_elem() succeeded */ 1109 print_key_value(&info, key, value); 1110 1111 exit_free: 1112 free(key); 1113 free(value); 1114 close(fd); 1115 1116 return err; 1117 } 1118 1119 static int do_getnext(int argc, char **argv) 1120 { 1121 struct bpf_map_info info = {}; 1122 __u32 len = sizeof(info); 1123 void *key, *nextkey; 1124 int err; 1125 int fd; 1126 1127 if (argc < 2) 1128 usage(); 1129 1130 fd = map_parse_fd_and_info(&argc, &argv, &info, &len); 1131 if (fd < 0) 1132 return -1; 1133 1134 key = malloc(info.key_size); 1135 nextkey = malloc(info.key_size); 1136 if (!key || !nextkey) { 1137 p_err("mem alloc failed"); 1138 err = -1; 1139 goto exit_free; 1140 } 1141 1142 if (argc) { 1143 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, 1144 NULL, NULL); 1145 if (err) 1146 goto exit_free; 1147 } else { 1148 free(key); 1149 key = NULL; 1150 } 1151 1152 err = bpf_map_get_next_key(fd, key, nextkey); 1153 if (err) { 1154 p_err("can't get next key: %s", strerror(errno)); 1155 goto exit_free; 1156 } 1157 1158 if (json_output) { 1159 jsonw_start_object(json_wtr); 1160 if (key) { 1161 jsonw_name(json_wtr, "key"); 1162 print_hex_data_json(key, info.key_size); 1163 } else { 1164 jsonw_null_field(json_wtr, "key"); 1165 } 1166 jsonw_name(json_wtr, "next_key"); 1167 print_hex_data_json(nextkey, info.key_size); 1168 jsonw_end_object(json_wtr); 1169 } else { 1170 if (key) { 1171 printf("key:\n"); 1172 fprint_hex(stdout, key, info.key_size, " "); 1173 printf("\n"); 1174 } else { 1175 printf("key: None\n"); 1176 } 1177 printf("next key:\n"); 1178 fprint_hex(stdout, nextkey, info.key_size, " "); 1179 printf("\n"); 1180 } 1181 1182 exit_free: 1183 free(nextkey); 1184 free(key); 1185 close(fd); 1186 1187 return err; 1188 } 1189 1190 static int do_delete(int argc, char **argv) 1191 { 1192 struct bpf_map_info info = {}; 1193 __u32 len = sizeof(info); 1194 void *key; 1195 int err; 1196 int fd; 1197 1198 if (argc < 2) 1199 usage(); 1200 1201 fd = map_parse_fd_and_info(&argc, &argv, &info, &len); 1202 if (fd < 0) 1203 return -1; 1204 1205 key = malloc(info.key_size); 1206 if (!key) { 1207 p_err("mem alloc failed"); 1208 err = -1; 1209 goto exit_free; 1210 } 1211 1212 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL); 1213 if (err) 1214 goto exit_free; 1215 1216 err = bpf_map_delete_elem(fd, key); 1217 if (err) 1218 p_err("delete failed: %s", strerror(errno)); 1219 1220 exit_free: 1221 free(key); 1222 close(fd); 1223 1224 if (!err && json_output) 1225 jsonw_null(json_wtr); 1226 return err; 1227 } 1228 1229 static int do_pin(int argc, char **argv) 1230 { 1231 int err; 1232 1233 err = do_pin_any(argc, argv, map_parse_fd); 1234 if (!err && json_output) 1235 jsonw_null(json_wtr); 1236 return err; 1237 } 1238 1239 static int do_create(int argc, char **argv) 1240 { 1241 LIBBPF_OPTS(bpf_map_create_opts, attr); 1242 enum bpf_map_type map_type = BPF_MAP_TYPE_UNSPEC; 1243 __u32 key_size = 0, value_size = 0, max_entries = 0; 1244 const char *map_name = NULL; 1245 const char *pinfile; 1246 int err = -1, fd; 1247 1248 if (!REQ_ARGS(7)) 1249 return -1; 1250 pinfile = GET_ARG(); 1251 1252 while (argc) { 1253 if (!REQ_ARGS(2)) 1254 return -1; 1255 1256 if (is_prefix(*argv, "type")) { 1257 NEXT_ARG(); 1258 1259 if (map_type) { 1260 p_err("map type already specified"); 1261 goto exit; 1262 } 1263 1264 map_type = map_type_from_str(*argv); 1265 if ((int)map_type < 0) { 1266 p_err("unrecognized map type: %s", *argv); 1267 goto exit; 1268 } 1269 NEXT_ARG(); 1270 } else if (is_prefix(*argv, "name")) { 1271 NEXT_ARG(); 1272 map_name = GET_ARG(); 1273 } else if (is_prefix(*argv, "key")) { 1274 if (parse_u32_arg(&argc, &argv, &key_size, 1275 "key size")) 1276 goto exit; 1277 } else if (is_prefix(*argv, "value")) { 1278 if (parse_u32_arg(&argc, &argv, &value_size, 1279 "value size")) 1280 goto exit; 1281 } else if (is_prefix(*argv, "entries")) { 1282 if (parse_u32_arg(&argc, &argv, &max_entries, 1283 "max entries")) 1284 goto exit; 1285 } else if (is_prefix(*argv, "flags")) { 1286 if (parse_u32_arg(&argc, &argv, &attr.map_flags, 1287 "flags")) 1288 goto exit; 1289 } else if (is_prefix(*argv, "dev")) { 1290 p_info("Warning: 'bpftool map create [...] dev <ifname>' syntax is deprecated.\n" 1291 "Going further, please use 'offload_dev <ifname>' to request hardware offload for the map."); 1292 goto offload_dev; 1293 } else if (is_prefix(*argv, "offload_dev")) { 1294 offload_dev: 1295 NEXT_ARG(); 1296 1297 if (attr.map_ifindex) { 1298 p_err("offload device already specified"); 1299 goto exit; 1300 } 1301 1302 attr.map_ifindex = if_nametoindex(*argv); 1303 if (!attr.map_ifindex) { 1304 p_err("unrecognized netdevice '%s': %s", 1305 *argv, strerror(errno)); 1306 goto exit; 1307 } 1308 NEXT_ARG(); 1309 } else if (is_prefix(*argv, "inner_map")) { 1310 struct bpf_map_info info = {}; 1311 __u32 len = sizeof(info); 1312 int inner_map_fd; 1313 1314 NEXT_ARG(); 1315 if (!REQ_ARGS(2)) 1316 usage(); 1317 inner_map_fd = map_parse_fd_and_info(&argc, &argv, 1318 &info, &len); 1319 if (inner_map_fd < 0) 1320 return -1; 1321 attr.inner_map_fd = inner_map_fd; 1322 } else { 1323 p_err("unknown arg %s", *argv); 1324 goto exit; 1325 } 1326 } 1327 1328 if (!map_name) { 1329 p_err("map name not specified"); 1330 goto exit; 1331 } 1332 1333 set_max_rlimit(); 1334 1335 fd = bpf_map_create(map_type, map_name, key_size, value_size, max_entries, &attr); 1336 if (fd < 0) { 1337 p_err("map create failed: %s", strerror(errno)); 1338 goto exit; 1339 } 1340 1341 err = do_pin_fd(fd, pinfile); 1342 close(fd); 1343 if (err) 1344 goto exit; 1345 1346 if (json_output) 1347 jsonw_null(json_wtr); 1348 1349 exit: 1350 if (attr.inner_map_fd > 0) 1351 close(attr.inner_map_fd); 1352 1353 return err; 1354 } 1355 1356 static int do_pop_dequeue(int argc, char **argv) 1357 { 1358 struct bpf_map_info info = {}; 1359 __u32 len = sizeof(info); 1360 void *key, *value; 1361 int err; 1362 int fd; 1363 1364 if (argc < 2) 1365 usage(); 1366 1367 fd = map_parse_fd_and_info(&argc, &argv, &info, &len); 1368 if (fd < 0) 1369 return -1; 1370 1371 err = alloc_key_value(&info, &key, &value); 1372 if (err) 1373 goto exit_free; 1374 1375 err = bpf_map_lookup_and_delete_elem(fd, key, value); 1376 if (err) { 1377 if (errno == ENOENT) { 1378 if (json_output) 1379 jsonw_null(json_wtr); 1380 else 1381 printf("Error: empty map\n"); 1382 } else { 1383 p_err("pop failed: %s", strerror(errno)); 1384 } 1385 1386 goto exit_free; 1387 } 1388 1389 print_key_value(&info, key, value); 1390 1391 exit_free: 1392 free(key); 1393 free(value); 1394 close(fd); 1395 1396 return err; 1397 } 1398 1399 static int do_freeze(int argc, char **argv) 1400 { 1401 int err, fd; 1402 1403 if (!REQ_ARGS(2)) 1404 return -1; 1405 1406 fd = map_parse_fd(&argc, &argv); 1407 if (fd < 0) 1408 return -1; 1409 1410 if (argc) { 1411 close(fd); 1412 return BAD_ARG(); 1413 } 1414 1415 err = bpf_map_freeze(fd); 1416 close(fd); 1417 if (err) { 1418 p_err("failed to freeze map: %s", strerror(errno)); 1419 return err; 1420 } 1421 1422 if (json_output) 1423 jsonw_null(json_wtr); 1424 1425 return 0; 1426 } 1427 1428 static int do_help(int argc, char **argv) 1429 { 1430 if (json_output) { 1431 jsonw_null(json_wtr); 1432 return 0; 1433 } 1434 1435 fprintf(stderr, 1436 "Usage: %1$s %2$s { show | list } [MAP]\n" 1437 " %1$s %2$s create FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n" 1438 " entries MAX_ENTRIES name NAME [flags FLAGS] \\\n" 1439 " [inner_map MAP] [offload_dev NAME]\n" 1440 " %1$s %2$s dump MAP\n" 1441 " %1$s %2$s update MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n" 1442 " %1$s %2$s lookup MAP [key DATA]\n" 1443 " %1$s %2$s getnext MAP [key DATA]\n" 1444 " %1$s %2$s delete MAP key DATA\n" 1445 " %1$s %2$s pin MAP FILE\n" 1446 " %1$s %2$s event_pipe MAP [cpu N index M]\n" 1447 " %1$s %2$s peek MAP\n" 1448 " %1$s %2$s push MAP value VALUE\n" 1449 " %1$s %2$s pop MAP\n" 1450 " %1$s %2$s enqueue MAP value VALUE\n" 1451 " %1$s %2$s dequeue MAP\n" 1452 " %1$s %2$s freeze MAP\n" 1453 " %1$s %2$s help\n" 1454 "\n" 1455 " " HELP_SPEC_MAP "\n" 1456 " DATA := { [hex] BYTES }\n" 1457 " " HELP_SPEC_PROGRAM "\n" 1458 " VALUE := { DATA | MAP | PROG }\n" 1459 " UPDATE_FLAGS := { any | exist | noexist }\n" 1460 " TYPE := { hash | array | prog_array | perf_event_array | percpu_hash |\n" 1461 " percpu_array | stack_trace | cgroup_array | lru_hash |\n" 1462 " lru_percpu_hash | lpm_trie | array_of_maps | hash_of_maps |\n" 1463 " devmap | devmap_hash | sockmap | cpumap | xskmap | sockhash |\n" 1464 " cgroup_storage | reuseport_sockarray | percpu_cgroup_storage |\n" 1465 " queue | stack | sk_storage | struct_ops | ringbuf | inode_storage |\n" 1466 " task_storage | bloom_filter | user_ringbuf | cgrp_storage }\n" 1467 " " HELP_SPEC_OPTIONS " |\n" 1468 " {-f|--bpffs} | {-n|--nomount} }\n" 1469 "", 1470 bin_name, argv[-2]); 1471 1472 return 0; 1473 } 1474 1475 static const struct cmd cmds[] = { 1476 { "show", do_show }, 1477 { "list", do_show }, 1478 { "help", do_help }, 1479 { "dump", do_dump }, 1480 { "update", do_update }, 1481 { "lookup", do_lookup }, 1482 { "getnext", do_getnext }, 1483 { "delete", do_delete }, 1484 { "pin", do_pin }, 1485 { "event_pipe", do_event_pipe }, 1486 { "create", do_create }, 1487 { "peek", do_lookup }, 1488 { "push", do_update }, 1489 { "enqueue", do_update }, 1490 { "pop", do_pop_dequeue }, 1491 { "dequeue", do_pop_dequeue }, 1492 { "freeze", do_freeze }, 1493 { 0 } 1494 }; 1495 1496 int do_map(int argc, char **argv) 1497 { 1498 return cmd_select(cmds, argc, argv, do_help); 1499 } 1500