tools/bpf/bpftool/map.c

   1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
   2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
   3
   4 #include <assert.h>
   5 #include <errno.h>
   6 #include <fcntl.h>
   7 #include <linux/err.h>
   8 #include <linux/kernel.h>
   9 #include <net/if.h>
  10 #include <stdbool.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <unistd.h>
  15 #include <sys/types.h>
  16 #include <sys/stat.h>
  17
  18 #include <bpf.h>
  19
  20 #include "btf.h"
  21 #include "json_writer.h"
  22 #include "main.h"
  23
  24 static const char * const map_type_name[] = {
  25         [BPF_MAP_TYPE_UNSPEC]                   = "unspec",
  26         [BPF_MAP_TYPE_HASH]                     = "hash",
  27         [BPF_MAP_TYPE_ARRAY]                    = "array",
  28         [BPF_MAP_TYPE_PROG_ARRAY]               = "prog_array",
  29         [BPF_MAP_TYPE_PERF_EVENT_ARRAY]         = "perf_event_array",
  30         [BPF_MAP_TYPE_PERCPU_HASH]              = "percpu_hash",
  31         [BPF_MAP_TYPE_PERCPU_ARRAY]             = "percpu_array",
  32         [BPF_MAP_TYPE_STACK_TRACE]              = "stack_trace",
  33         [BPF_MAP_TYPE_CGROUP_ARRAY]             = "cgroup_array",
  34         [BPF_MAP_TYPE_LRU_HASH]                 = "lru_hash",
  35         [BPF_MAP_TYPE_LRU_PERCPU_HASH]          = "lru_percpu_hash",
  36         [BPF_MAP_TYPE_LPM_TRIE]                 = "lpm_trie",
  37         [BPF_MAP_TYPE_ARRAY_OF_MAPS]            = "array_of_maps",
  38         [BPF_MAP_TYPE_HASH_OF_MAPS]             = "hash_of_maps",
  39         [BPF_MAP_TYPE_DEVMAP]                   = "devmap",
  40         [BPF_MAP_TYPE_SOCKMAP]                  = "sockmap",
  41         [BPF_MAP_TYPE_CPUMAP]                   = "cpumap",
  42         [BPF_MAP_TYPE_XSKMAP]                   = "xskmap",
  43         [BPF_MAP_TYPE_SOCKHASH]                 = "sockhash",
  44         [BPF_MAP_TYPE_CGROUP_STORAGE]           = "cgroup_storage",
  45         [BPF_MAP_TYPE_REUSEPORT_SOCKARRAY]      = "reuseport_sockarray",
  46         [BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE]    = "percpu_cgroup_storage",
  47         [BPF_MAP_TYPE_QUEUE]                    = "queue",
  48         [BPF_MAP_TYPE_STACK]                    = "stack",
  49 };
  50
  51 static bool map_is_per_cpu(__u32 type)
  52 {
  53         return type == BPF_MAP_TYPE_PERCPU_HASH ||
  54                type == BPF_MAP_TYPE_PERCPU_ARRAY ||
  55                type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
  56                type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
  57 }
  58
  59 static bool map_is_map_of_maps(__u32 type)
  60 {
  61         return type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
  62                type == BPF_MAP_TYPE_HASH_OF_MAPS;
  63 }
  64
  65 static bool map_is_map_of_progs(__u32 type)
  66 {
  67         return type == BPF_MAP_TYPE_PROG_ARRAY;
  68 }
  69
  70 static int map_type_from_str(const char *type)
  71 {
  72         unsigned int i;
  73
  74         for (i = 0; i < ARRAY_SIZE(map_type_name); i++)
  75                 /* Don't allow prefixing in case of possible future shadowing */
  76                 if (map_type_name[i] && !strcmp(map_type_name[i], type))
  77                         return i;
  78         return -1;
  79 }
  80
  81 static void *alloc_value(struct bpf_map_info *info)
  82 {
  83         if (map_is_per_cpu(info->type))
  84                 return malloc(round_up(info->value_size, 8) *
  85                               get_possible_cpus());
  86         else
  87                 return malloc(info->value_size);
  88 }
  89
  90 int map_parse_fd(int *argc, char ***argv)
  91 {
  92         int fd;
  93
  94         if (is_prefix(**argv, "id")) {
  95                 unsigned int id;
  96                 char *endptr;
  97
  98                 NEXT_ARGP();
  99
 100                 id = strtoul(**argv, &endptr, 0);
 101                 if (*endptr) {
 102                         p_err("can't parse %s as ID", **argv);
 103                         return -1;
 104                 }
 105                 NEXT_ARGP();
 106
 107                 fd = bpf_map_get_fd_by_id(id);
 108                 if (fd < 0)
 109                         p_err("get map by id (%u): %s", id, strerror(errno));
 110                 return fd;
 111         } else if (is_prefix(**argv, "pinned")) {
 112                 char *path;
 113
 114                 NEXT_ARGP();
 115
 116                 path = **argv;
 117                 NEXT_ARGP();
 118
 119                 return open_obj_pinned_any(path, BPF_OBJ_MAP);
 120         }
 121
 122         p_err("expected 'id' or 'pinned', got: '%s'?", **argv);
 123         return -1;
 124 }
 125
 126 int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
 127 {
 128         int err;
 129         int fd;
 130
 131         fd = map_parse_fd(argc, argv);
 132         if (fd < 0)
 133                 return -1;
 134
 135         err = bpf_obj_get_info_by_fd(fd, info, info_len);
 136         if (err) {
 137                 p_err("can't get map info: %s", strerror(errno));
 138                 close(fd);
 139                 return err;
 140         }
 141
 142         return fd;
 143 }
 144
 145 static int do_dump_btf(const struct btf_dumper *d,
 146                        struct bpf_map_info *map_info, void *key,
 147                        void *value)
 148 {
 149         int ret;
 150
 151         /* start of key-value pair */
 152         jsonw_start_object(d->jw);
 153
 154         jsonw_name(d->jw, "key");
 155
 156         ret = btf_dumper_type(d, map_info->btf_key_type_id, key);
 157         if (ret)
 158                 goto err_end_obj;
 159
 160         if (!map_is_per_cpu(map_info->type)) {
 161                 jsonw_name(d->jw, "value");
 162                 ret = btf_dumper_type(d, map_info->btf_value_type_id, value);
 163         } else {
 164                 unsigned int i, n, step;
 165
 166                 jsonw_name(d->jw, "values");
 167                 jsonw_start_array(d->jw);
 168                 n = get_possible_cpus();
 169                 step = round_up(map_info->value_size, 8);
 170                 for (i = 0; i < n; i++) {
 171                         jsonw_start_object(d->jw);
 172                         jsonw_int_field(d->jw, "cpu", i);
 173                         jsonw_name(d->jw, "value");
 174                         ret = btf_dumper_type(d, map_info->btf_value_type_id,
 175                                               value + i * step);
 176                         jsonw_end_object(d->jw);
 177                         if (ret)
 178                                 break;
 179                 }
 180                 jsonw_end_array(d->jw);
 181         }
 182
 183 err_end_obj:
 184         /* end of key-value pair */
 185         jsonw_end_object(d->jw);
 186
 187         return ret;
 188 }
 189
 190 static json_writer_t *get_btf_writer(void)
 191 {
 192         json_writer_t *jw = jsonw_new(stdout);
 193
 194         if (!jw)
 195                 return NULL;
 196         jsonw_pretty(jw, true);
 197
 198         return jw;
 199 }
 200
 201 static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
 202                              unsigned char *value, struct btf *btf)
 203 {
 204         jsonw_start_object(json_wtr);
 205
 206         if (!map_is_per_cpu(info->type)) {
 207                 jsonw_name(json_wtr, "key");
 208                 print_hex_data_json(key, info->key_size);
 209                 jsonw_name(json_wtr, "value");
 210                 print_hex_data_json(value, info->value_size);
 211                 if (btf) {
 212                         struct btf_dumper d = {
 213                                 .btf = btf,
 214                                 .jw = json_wtr,
 215                                 .is_plain_text = false,
 216                         };
 217
 218                         jsonw_name(json_wtr, "formatted");
 219                         do_dump_btf(&d, info, key, value);
 220                 }
 221         } else {
 222                 unsigned int i, n, step;
 223
 224                 n = get_possible_cpus();
 225                 step = round_up(info->value_size, 8);
 226
 227                 jsonw_name(json_wtr, "key");
 228                 print_hex_data_json(key, info->key_size);
 229
 230                 jsonw_name(json_wtr, "values");
 231                 jsonw_start_array(json_wtr);
 232                 for (i = 0; i < n; i++) {
 233                         jsonw_start_object(json_wtr);
 234
 235                         jsonw_int_field(json_wtr, "cpu", i);
 236
 237                         jsonw_name(json_wtr, "value");
 238                         print_hex_data_json(value + i * step,
 239                                             info->value_size);
 240
 241                         jsonw_end_object(json_wtr);
 242                 }
 243                 jsonw_end_array(json_wtr);
 244                 if (btf) {
 245                         struct btf_dumper d = {
 246                                 .btf = btf,
 247                                 .jw = json_wtr,
 248                                 .is_plain_text = false,
 249                         };
 250
 251                         jsonw_name(json_wtr, "formatted");
 252                         do_dump_btf(&d, info, key, value);
 253                 }
 254         }
 255
 256         jsonw_end_object(json_wtr);
 257 }
 258
 259 static void print_entry_error(struct bpf_map_info *info, unsigned char *key,
 260                               const char *value)
 261 {
 262         int value_size = strlen(value);
 263         bool single_line, break_names;
 264
 265         break_names = info->key_size > 16 || value_size > 16;
 266         single_line = info->key_size + value_size <= 24 && !break_names;
 267
 268         printf("key:%c", break_names ? '\n' : ' ');
 269         fprint_hex(stdout, key, info->key_size, " ");
 270
 271         printf(single_line ? "  " : "\n");
 272
 273         printf("value:%c%s", break_names ? '\n' : ' ', value);
 274
 275         printf("\n");
 276 }
 277
 278 static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
 279                               unsigned char *value)
 280 {
 281         if (!map_is_per_cpu(info->type)) {
 282                 bool single_line, break_names;
 283
 284                 break_names = info->key_size > 16 || info->value_size > 16;
 285                 single_line = info->key_size + info->value_size <= 24 &&
 286                         !break_names;
 287
 288                 printf("key:%c", break_names ? '\n' : ' ');
 289                 fprint_hex(stdout, key, info->key_size, " ");
 290
 291                 printf(single_line ? "  " : "\n");
 292
 293                 printf("value:%c", break_names ? '\n' : ' ');
 294                 if (value)
 295                         fprint_hex(stdout, value, info->value_size, " ");
 296                 else
 297                         printf("<no entry>");
 298
 299                 printf("\n");
 300         } else {
 301                 unsigned int i, n, step;
 302
 303                 n = get_possible_cpus();
 304                 step = round_up(info->value_size, 8);
 305
 306                 printf("key:\n");
 307                 fprint_hex(stdout, key, info->key_size, " ");
 308                 printf("\n");
 309                 for (i = 0; i < n; i++) {
 310                         printf("value (CPU %02d):%c",
 311                                i, info->value_size > 16 ? '\n' : ' ');
 312                         if (value)
 313                                 fprint_hex(stdout, value + i * step,
 314                                            info->value_size, " ");
 315                         else
 316                                 printf("<no entry>");
 317                         printf("\n");
 318                 }
 319         }
 320 }
 321
 322 static char **parse_bytes(char **argv, const char *name, unsigned char *val,
 323                           unsigned int n)
 324 {
 325         unsigned int i = 0, base = 0;
 326         char *endptr;
 327
 328         if (is_prefix(*argv, "hex")) {
 329                 base = 16;
 330                 argv++;
 331         }
 332
 333         while (i < n && argv[i]) {
 334                 val[i] = strtoul(argv[i], &endptr, base);
 335                 if (*endptr) {
 336                         p_err("error parsing byte: %s", argv[i]);
 337                         return NULL;
 338                 }
 339                 i++;
 340         }
 341
 342         if (i != n) {
 343                 p_err("%s expected %d bytes got %d", name, n, i);
 344                 return NULL;
 345         }
 346
 347         return argv + i;
 348 }
 349
 350 /* on per cpu maps we must copy the provided value on all value instances */
 351 static void fill_per_cpu_value(struct bpf_map_info *info, void *value)
 352 {
 353         unsigned int i, n, step;
 354
 355         if (!map_is_per_cpu(info->type))
 356                 return;
 357
 358         n = get_possible_cpus();
 359         step = round_up(info->value_size, 8);
 360         for (i = 1; i < n; i++)
 361                 memcpy(value + i * step, value, info->value_size);
 362 }
 363
 364 static int parse_elem(char **argv, struct bpf_map_info *info,
 365                       void *key, void *value, __u32 key_size, __u32 value_size,
 366                       __u32 *flags, __u32 **value_fd)
 367 {
 368         if (!*argv) {
 369                 if (!key && !value)
 370                         return 0;
 371                 p_err("did not find %s", key ? "key" : "value");
 372                 return -1;
 373         }
 374
 375         if (is_prefix(*argv, "key")) {
 376                 if (!key) {
 377                         if (key_size)
 378                                 p_err("duplicate key");
 379                         else
 380                                 p_err("unnecessary key");
 381                         return -1;
 382                 }
 383
 384                 argv = parse_bytes(argv + 1, "key", key, key_size);
 385                 if (!argv)
 386                         return -1;
 387
 388                 return parse_elem(argv, info, NULL, value, key_size, value_size,
 389                                   flags, value_fd);
 390         } else if (is_prefix(*argv, "value")) {
 391                 int fd;
 392
 393                 if (!value) {
 394                         if (value_size)
 395                                 p_err("duplicate value");
 396                         else
 397                                 p_err("unnecessary value");
 398                         return -1;
 399                 }
 400
 401                 argv++;
 402
 403                 if (map_is_map_of_maps(info->type)) {
 404                         int argc = 2;
 405
 406                         if (value_size != 4) {
 407                                 p_err("value smaller than 4B for map in map?");
 408                                 return -1;
 409                         }
 410                         if (!argv[0] || !argv[1]) {
 411                                 p_err("not enough value arguments for map in map");
 412                                 return -1;
 413                         }
 414
 415                         fd = map_parse_fd(&argc, &argv);
 416                         if (fd < 0)
 417                                 return -1;
 418
 419                         *value_fd = value;
 420                         **value_fd = fd;
 421                 } else if (map_is_map_of_progs(info->type)) {
 422                         int argc = 2;
 423
 424                         if (value_size != 4) {
 425                                 p_err("value smaller than 4B for map of progs?");
 426                                 return -1;
 427                         }
 428                         if (!argv[0] || !argv[1]) {
 429                                 p_err("not enough value arguments for map of progs");
 430                                 return -1;
 431                         }
 432
 433                         fd = prog_parse_fd(&argc, &argv);
 434                         if (fd < 0)
 435                                 return -1;
 436
 437                         *value_fd = value;
 438                         **value_fd = fd;
 439                 } else {
 440                         argv = parse_bytes(argv, "value", value, value_size);
 441                         if (!argv)
 442                                 return -1;
 443
 444                         fill_per_cpu_value(info, value);
 445                 }
 446
 447                 return parse_elem(argv, info, key, NULL, key_size, value_size,
 448                                   flags, NULL);
 449         } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") ||
 450                    is_prefix(*argv, "exist")) {
 451                 if (!flags) {
 452                         p_err("flags specified multiple times: %s", *argv);
 453                         return -1;
 454                 }
 455
 456                 if (is_prefix(*argv, "any"))
 457                         *flags = BPF_ANY;
 458                 else if (is_prefix(*argv, "noexist"))
 459                         *flags = BPF_NOEXIST;
 460                 else if (is_prefix(*argv, "exist"))
 461                         *flags = BPF_EXIST;
 462
 463                 return parse_elem(argv + 1, info, key, value, key_size,
 464                                   value_size, NULL, value_fd);
 465         }
 466
 467         p_err("expected key or value, got: %s", *argv);
 468         return -1;
 469 }
 470
 471 static int show_map_close_json(int fd, struct bpf_map_info *info)
 472 {
 473         char *memlock;
 474
 475         memlock = get_fdinfo(fd, "memlock");
 476
 477         jsonw_start_object(json_wtr);
 478
 479         jsonw_uint_field(json_wtr, "id", info->id);
 480         if (info->type < ARRAY_SIZE(map_type_name))
 481                 jsonw_string_field(json_wtr, "type",
 482                                    map_type_name[info->type]);
 483         else
 484                 jsonw_uint_field(json_wtr, "type", info->type);
 485
 486         if (*info->name)
 487                 jsonw_string_field(json_wtr, "name", info->name);
 488
 489         jsonw_name(json_wtr, "flags");
 490         jsonw_printf(json_wtr, "%d", info->map_flags);
 491
 492         print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
 493
 494         jsonw_uint_field(json_wtr, "bytes_key", info->key_size);
 495         jsonw_uint_field(json_wtr, "bytes_value", info->value_size);
 496         jsonw_uint_field(json_wtr, "max_entries", info->max_entries);
 497
 498         if (memlock)
 499                 jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
 500         free(memlock);
 501
 502         if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
 503                 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
 504                 char *owner_jited = get_fdinfo(fd, "owner_jited");
 505
 506                 if (owner_prog_type) {
 507                         unsigned int prog_type = atoi(owner_prog_type);
 508
 509                         if (prog_type < ARRAY_SIZE(prog_type_name))
 510                                 jsonw_string_field(json_wtr, "owner_prog_type",
 511                                                    prog_type_name[prog_type]);
 512                         else
 513                                 jsonw_uint_field(json_wtr, "owner_prog_type",
 514                                                  prog_type);
 515                 }
 516                 if (owner_jited)
 517                         jsonw_bool_field(json_wtr, "owner_jited",
 518                                          !!atoi(owner_jited));
 519
 520                 free(owner_prog_type);
 521                 free(owner_jited);
 522         }
 523         close(fd);
 524
 525         if (!hash_empty(map_table.table)) {
 526                 struct pinned_obj *obj;
 527
 528                 jsonw_name(json_wtr, "pinned");
 529                 jsonw_start_array(json_wtr);
 530                 hash_for_each_possible(map_table.table, obj, hash, info->id) {
 531                         if (obj->id == info->id)
 532                                 jsonw_string(json_wtr, obj->path);
 533                 }
 534                 jsonw_end_array(json_wtr);
 535         }
 536
 537         jsonw_end_object(json_wtr);
 538
 539         return 0;
 540 }
 541
 542 static int show_map_close_plain(int fd, struct bpf_map_info *info)
 543 {
 544         char *memlock;
 545
 546         memlock = get_fdinfo(fd, "memlock");
 547
 548         printf("%u: ", info->id);
 549         if (info->type < ARRAY_SIZE(map_type_name))
 550                 printf("%s  ", map_type_name[info->type]);
 551         else
 552                 printf("type %u  ", info->type);
 553
 554         if (*info->name)
 555                 printf("name %s  ", info->name);
 556
 557         printf("flags 0x%x", info->map_flags);
 558         print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
 559         printf("\n");
 560         printf("\tkey %uB  value %uB  max_entries %u",
 561                info->key_size, info->value_size, info->max_entries);
 562
 563         if (memlock)
 564                 printf("  memlock %sB", memlock);
 565         free(memlock);
 566
 567         if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
 568                 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
 569                 char *owner_jited = get_fdinfo(fd, "owner_jited");
 570
 571                 if (owner_prog_type || owner_jited)
 572                         printf("\n\t");
 573                 if (owner_prog_type) {
 574                         unsigned int prog_type = atoi(owner_prog_type);
 575
 576                         if (prog_type < ARRAY_SIZE(prog_type_name))
 577                                 printf("owner_prog_type %s  ",
 578                                        prog_type_name[prog_type]);
 579                         else
 580                                 printf("owner_prog_type %d  ", prog_type);
 581                 }
 582                 if (owner_jited)
 583                         printf("owner%s jited",
 584                                atoi(owner_jited) ? "" : " not");
 585
 586                 free(owner_prog_type);
 587                 free(owner_jited);
 588         }
 589         close(fd);
 590
 591         printf("\n");
 592         if (!hash_empty(map_table.table)) {
 593                 struct pinned_obj *obj;
 594
 595                 hash_for_each_possible(map_table.table, obj, hash, info->id) {
 596                         if (obj->id == info->id)
 597                                 printf("\tpinned %s\n", obj->path);
 598                 }
 599         }
 600         return 0;
 601 }
 602
 603 static int do_show(int argc, char **argv)
 604 {
 605         struct bpf_map_info info = {};
 606         __u32 len = sizeof(info);
 607         __u32 id = 0;
 608         int err;
 609         int fd;
 610
 611         if (show_pinned)
 612                 build_pinned_obj_table(&map_table, BPF_OBJ_MAP);
 613
 614         if (argc == 2) {
 615                 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 616                 if (fd < 0)
 617                         return -1;
 618
 619                 if (json_output)
 620                         return show_map_close_json(fd, &info);
 621                 else
 622                         return show_map_close_plain(fd, &info);
 623         }
 624
 625         if (argc)
 626                 return BAD_ARG();
 627
 628         if (json_output)
 629                 jsonw_start_array(json_wtr);
 630         while (true) {
 631                 err = bpf_map_get_next_id(id, &id);
 632                 if (err) {
 633                         if (errno == ENOENT)
 634                                 break;
 635                         p_err("can't get next map: %s%s", strerror(errno),
 636                               errno == EINVAL ? " -- kernel too old?" : "");
 637                         break;
 638                 }
 639
 640                 fd = bpf_map_get_fd_by_id(id);
 641                 if (fd < 0) {
 642                         if (errno == ENOENT)
 643                                 continue;
 644                         p_err("can't get map by id (%u): %s",
 645                               id, strerror(errno));
 646                         break;
 647                 }
 648
 649                 err = bpf_obj_get_info_by_fd(fd, &info, &len);
 650                 if (err) {
 651                         p_err("can't get map info: %s", strerror(errno));
 652                         close(fd);
 653                         break;
 654                 }
 655
 656                 if (json_output)
 657                         show_map_close_json(fd, &info);
 658                 else
 659                         show_map_close_plain(fd, &info);
 660         }
 661         if (json_output)
 662                 jsonw_end_array(json_wtr);
 663
 664         return errno == ENOENT ? 0 : -1;
 665 }
 666
 667 static int dump_map_elem(int fd, void *key, void *value,
 668                          struct bpf_map_info *map_info, struct btf *btf,
 669                          json_writer_t *btf_wtr)
 670 {
 671         int num_elems = 0;
 672         int lookup_errno;
 673
 674         if (!bpf_map_lookup_elem(fd, key, value)) {
 675                 if (json_output) {
 676                         print_entry_json(map_info, key, value, btf);
 677                 } else {
 678                         if (btf) {
 679                                 struct btf_dumper d = {
 680                                         .btf = btf,
 681                                         .jw = btf_wtr,
 682                                         .is_plain_text = true,
 683                                 };
 684
 685                                 do_dump_btf(&d, map_info, key, value);
 686                         } else {
 687                                 print_entry_plain(map_info, key, value);
 688                         }
 689                         num_elems++;
 690                 }
 691                 return num_elems;
 692         }
 693
 694         /* lookup error handling */
 695         lookup_errno = errno;
 696
 697         if (map_is_map_of_maps(map_info->type) ||
 698             map_is_map_of_progs(map_info->type))
 699                 return 0;
 700
 701         if (json_output) {
 702                 jsonw_name(json_wtr, "key");
 703                 print_hex_data_json(key, map_info->key_size);
 704                 jsonw_name(json_wtr, "value");
 705                 jsonw_start_object(json_wtr);
 706                 jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
 707                 jsonw_end_object(json_wtr);
 708         } else {
 709                 if (errno == ENOENT)
 710                         print_entry_plain(map_info, key, NULL);
 711                 else
 712                         print_entry_error(map_info, key,
 713                                           strerror(lookup_errno));
 714         }
 715
 716         return 0;
 717 }
 718
 719 static int do_dump(int argc, char **argv)
 720 {
 721         struct bpf_map_info info = {};
 722         void *key, *value, *prev_key;
 723         unsigned int num_elems = 0;
 724         __u32 len = sizeof(info);
 725         json_writer_t *btf_wtr;
 726         struct btf *btf = NULL;
 727         int err;
 728         int fd;
 729
 730         if (argc != 2)
 731                 usage();
 732
 733         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 734         if (fd < 0)
 735                 return -1;
 736
 737         key = malloc(info.key_size);
 738         value = alloc_value(&info);
 739         if (!key || !value) {
 740                 p_err("mem alloc failed");
 741                 err = -1;
 742                 goto exit_free;
 743         }
 744
 745         prev_key = NULL;
 746
 747         err = btf__get_from_id(info.btf_id, &btf);
 748         if (err) {
 749                 p_err("failed to get btf");
 750                 goto exit_free;
 751         }
 752
 753         if (json_output)
 754                 jsonw_start_array(json_wtr);
 755         else
 756                 if (btf) {
 757                         btf_wtr = get_btf_writer();
 758                         if (!btf_wtr) {
 759                                 p_info("failed to create json writer for btf. falling back to plain output");
 760                                 btf__free(btf);
 761                                 btf = NULL;
 762                         } else {
 763                                 jsonw_start_array(btf_wtr);
 764                         }
 765                 }
 766
 767         while (true) {
 768                 err = bpf_map_get_next_key(fd, prev_key, key);
 769                 if (err) {
 770                         if (errno == ENOENT)
 771                                 err = 0;
 772                         break;
 773                 }
 774                 num_elems += dump_map_elem(fd, key, value, &info, btf, btf_wtr);
 775                 prev_key = key;
 776         }
 777
 778         if (json_output)
 779                 jsonw_end_array(json_wtr);
 780         else if (btf) {
 781                 jsonw_end_array(btf_wtr);
 782                 jsonw_destroy(&btf_wtr);
 783         } else {
 784                 printf("Found %u element%s\n", num_elems,
 785                        num_elems != 1 ? "s" : "");
 786         }
 787
 788 exit_free:
 789         free(key);
 790         free(value);
 791         close(fd);
 792         btf__free(btf);
 793
 794         return err;
 795 }
 796
 797 static int do_update(int argc, char **argv)
 798 {
 799         struct bpf_map_info info = {};
 800         __u32 len = sizeof(info);
 801         __u32 *value_fd = NULL;
 802         __u32 flags = BPF_ANY;
 803         void *key, *value;
 804         int fd, err;
 805
 806         if (argc < 2)
 807                 usage();
 808
 809         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 810         if (fd < 0)
 811                 return -1;
 812
 813         key = malloc(info.key_size);
 814         value = alloc_value(&info);
 815         if (!key || !value) {
 816                 p_err("mem alloc failed");
 817                 err = -1;
 818                 goto exit_free;
 819         }
 820
 821         err = parse_elem(argv, &info, key, value, info.key_size,
 822                          info.value_size, &flags, &value_fd);
 823         if (err)
 824                 goto exit_free;
 825
 826         err = bpf_map_update_elem(fd, key, value, flags);
 827         if (err) {
 828                 p_err("update failed: %s", strerror(errno));
 829                 goto exit_free;
 830         }
 831
 832 exit_free:
 833         if (value_fd)
 834                 close(*value_fd);
 835         free(key);
 836         free(value);
 837         close(fd);
 838
 839         if (!err && json_output)
 840                 jsonw_null(json_wtr);
 841         return err;
 842 }
 843
 844 static int do_lookup(int argc, char **argv)
 845 {
 846         struct bpf_map_info info = {};
 847         __u32 len = sizeof(info);
 848         json_writer_t *btf_wtr;
 849         struct btf *btf = NULL;
 850         void *key, *value;
 851         int err;
 852         int fd;
 853
 854         if (argc < 2)
 855                 usage();
 856
 857         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 858         if (fd < 0)
 859                 return -1;
 860
 861         key = malloc(info.key_size);
 862         value = alloc_value(&info);
 863         if (!key || !value) {
 864                 p_err("mem alloc failed");
 865                 err = -1;
 866                 goto exit_free;
 867         }
 868
 869         err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
 870         if (err)
 871                 goto exit_free;
 872
 873         err = bpf_map_lookup_elem(fd, key, value);
 874         if (err) {
 875                 if (errno == ENOENT) {
 876                         if (json_output) {
 877                                 jsonw_null(json_wtr);
 878                         } else {
 879                                 printf("key:\n");
 880                                 fprint_hex(stdout, key, info.key_size, " ");
 881                                 printf("\n\nNot found\n");
 882                         }
 883                 } else {
 884                         p_err("lookup failed: %s", strerror(errno));
 885                 }
 886
 887                 goto exit_free;
 888         }
 889
 890         /* here means bpf_map_lookup_elem() succeeded */
 891         err = btf__get_from_id(info.btf_id, &btf);
 892         if (err) {
 893                 p_err("failed to get btf");
 894                 goto exit_free;
 895         }
 896
 897         if (json_output) {
 898                 print_entry_json(&info, key, value, btf);
 899         } else if (btf) {
 900                 /* if here json_wtr wouldn't have been initialised,
 901                  * so let's create separate writer for btf
 902                  */
 903                 btf_wtr = get_btf_writer();
 904                 if (!btf_wtr) {
 905                         p_info("failed to create json writer for btf. falling back to plain output");
 906                         btf__free(btf);
 907                         btf = NULL;
 908                         print_entry_plain(&info, key, value);
 909                 } else {
 910                         struct btf_dumper d = {
 911                                 .btf = btf,
 912                                 .jw = btf_wtr,
 913                                 .is_plain_text = true,
 914                         };
 915
 916                         do_dump_btf(&d, &info, key, value);
 917                         jsonw_destroy(&btf_wtr);
 918                 }
 919         } else {
 920                 print_entry_plain(&info, key, value);
 921         }
 922
 923 exit_free:
 924         free(key);
 925         free(value);
 926         close(fd);
 927         btf__free(btf);
 928
 929         return err;
 930 }
 931
 932 static int do_getnext(int argc, char **argv)
 933 {
 934         struct bpf_map_info info = {};
 935         __u32 len = sizeof(info);
 936         void *key, *nextkey;
 937         int err;
 938         int fd;
 939
 940         if (argc < 2)
 941                 usage();
 942
 943         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 944         if (fd < 0)
 945                 return -1;
 946
 947         key = malloc(info.key_size);
 948         nextkey = malloc(info.key_size);
 949         if (!key || !nextkey) {
 950                 p_err("mem alloc failed");
 951                 err = -1;
 952                 goto exit_free;
 953         }
 954
 955         if (argc) {
 956                 err = parse_elem(argv, &info, key, NULL, info.key_size, 0,
 957                                  NULL, NULL);
 958                 if (err)
 959                         goto exit_free;
 960         } else {
 961                 free(key);
 962                 key = NULL;
 963         }
 964
 965         err = bpf_map_get_next_key(fd, key, nextkey);
 966         if (err) {
 967                 p_err("can't get next key: %s", strerror(errno));
 968                 goto exit_free;
 969         }
 970
 971         if (json_output) {
 972                 jsonw_start_object(json_wtr);
 973                 if (key) {
 974                         jsonw_name(json_wtr, "key");
 975                         print_hex_data_json(key, info.key_size);
 976                 } else {
 977                         jsonw_null_field(json_wtr, "key");
 978                 }
 979                 jsonw_name(json_wtr, "next_key");
 980                 print_hex_data_json(nextkey, info.key_size);
 981                 jsonw_end_object(json_wtr);
 982         } else {
 983                 if (key) {
 984                         printf("key:\n");
 985                         fprint_hex(stdout, key, info.key_size, " ");
 986                         printf("\n");
 987                 } else {
 988                         printf("key: None\n");
 989                 }
 990                 printf("next key:\n");
 991                 fprint_hex(stdout, nextkey, info.key_size, " ");
 992                 printf("\n");
 993         }
 994
 995 exit_free:
 996         free(nextkey);
 997         free(key);
 998         close(fd);
 999
1000         return err;
1001 }
1002
1003 static int do_delete(int argc, char **argv)
1004 {
1005         struct bpf_map_info info = {};
1006         __u32 len = sizeof(info);
1007         void *key;
1008         int err;
1009         int fd;
1010
1011         if (argc < 2)
1012                 usage();
1013
1014         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1015         if (fd < 0)
1016                 return -1;
1017
1018         key = malloc(info.key_size);
1019         if (!key) {
1020                 p_err("mem alloc failed");
1021                 err = -1;
1022                 goto exit_free;
1023         }
1024
1025         err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
1026         if (err)
1027                 goto exit_free;
1028
1029         err = bpf_map_delete_elem(fd, key);
1030         if (err)
1031                 p_err("delete failed: %s", strerror(errno));
1032
1033 exit_free:
1034         free(key);
1035         close(fd);
1036
1037         if (!err && json_output)
1038                 jsonw_null(json_wtr);
1039         return err;
1040 }
1041
1042 static int do_pin(int argc, char **argv)
1043 {
1044         int err;
1045
1046         err = do_pin_any(argc, argv, bpf_map_get_fd_by_id);
1047         if (!err && json_output)
1048                 jsonw_null(json_wtr);
1049         return err;
1050 }
1051
1052 static int do_create(int argc, char **argv)
1053 {
1054         struct bpf_create_map_attr attr = { NULL, };
1055         const char *pinfile;
1056         int err, fd;
1057
1058         if (!REQ_ARGS(7))
1059                 return -1;
1060         pinfile = GET_ARG();
1061
1062         while (argc) {
1063                 if (!REQ_ARGS(2))
1064                         return -1;
1065
1066                 if (is_prefix(*argv, "type")) {
1067                         NEXT_ARG();
1068
1069                         if (attr.map_type) {
1070                                 p_err("map type already specified");
1071                                 return -1;
1072                         }
1073
1074                         attr.map_type = map_type_from_str(*argv);
1075                         if ((int)attr.map_type < 0) {
1076                                 p_err("unrecognized map type: %s", *argv);
1077                                 return -1;
1078                         }
1079                         NEXT_ARG();
1080                 } else if (is_prefix(*argv, "name")) {
1081                         NEXT_ARG();
1082                         attr.name = GET_ARG();
1083                 } else if (is_prefix(*argv, "key")) {
1084                         if (parse_u32_arg(&argc, &argv, &attr.key_size,
1085                                           "key size"))
1086                                 return -1;
1087                 } else if (is_prefix(*argv, "value")) {
1088                         if (parse_u32_arg(&argc, &argv, &attr.value_size,
1089                                           "value size"))
1090                                 return -1;
1091                 } else if (is_prefix(*argv, "entries")) {
1092                         if (parse_u32_arg(&argc, &argv, &attr.max_entries,
1093                                           "max entries"))
1094                                 return -1;
1095                 } else if (is_prefix(*argv, "flags")) {
1096                         if (parse_u32_arg(&argc, &argv, &attr.map_flags,
1097                                           "flags"))
1098                                 return -1;
1099                 } else if (is_prefix(*argv, "dev")) {
1100                         NEXT_ARG();
1101
1102                         if (attr.map_ifindex) {
1103                                 p_err("offload device already specified");
1104                                 return -1;
1105                         }
1106
1107                         attr.map_ifindex = if_nametoindex(*argv);
1108                         if (!attr.map_ifindex) {
1109                                 p_err("unrecognized netdevice '%s': %s",
1110                                       *argv, strerror(errno));
1111                                 return -1;
1112                         }
1113                         NEXT_ARG();
1114                 }
1115         }
1116
1117         if (!attr.name) {
1118                 p_err("map name not specified");
1119                 return -1;
1120         }
1121
1122         set_max_rlimit();
1123
1124         fd = bpf_create_map_xattr(&attr);
1125         if (fd < 0) {
1126                 p_err("map create failed: %s", strerror(errno));
1127                 return -1;
1128         }
1129
1130         err = do_pin_fd(fd, pinfile);
1131         close(fd);
1132         if (err)
1133                 return err;
1134
1135         if (json_output)
1136                 jsonw_null(json_wtr);
1137         return 0;
1138 }
1139
1140 static int do_help(int argc, char **argv)
1141 {
1142         if (json_output) {
1143                 jsonw_null(json_wtr);
1144                 return 0;
1145         }
1146
1147         fprintf(stderr,
1148                 "Usage: %s %s { show | list }   [MAP]\n"
1149                 "       %s %s create     FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
1150                 "                              entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
1151                 "                              [dev NAME]\n"
1152                 "       %s %s dump       MAP\n"
1153                 "       %s %s update     MAP  key DATA value VALUE [UPDATE_FLAGS]\n"
1154                 "       %s %s lookup     MAP  key DATA\n"
1155                 "       %s %s getnext    MAP [key DATA]\n"
1156                 "       %s %s delete     MAP  key DATA\n"
1157                 "       %s %s pin        MAP  FILE\n"
1158                 "       %s %s event_pipe MAP [cpu N index M]\n"
1159                 "       %s %s help\n"
1160                 "\n"
1161                 "       " HELP_SPEC_MAP "\n"
1162                 "       DATA := { [hex] BYTES }\n"
1163                 "       " HELP_SPEC_PROGRAM "\n"
1164                 "       VALUE := { DATA | MAP | PROG }\n"
1165                 "       UPDATE_FLAGS := { any | exist | noexist }\n"
1166                 "       TYPE := { hash | array | prog_array | perf_event_array | percpu_hash |\n"
1167                 "                 percpu_array | stack_trace | cgroup_array | lru_hash |\n"
1168                 "                 lru_percpu_hash | lpm_trie | array_of_maps | hash_of_maps |\n"
1169                 "                 devmap | sockmap | cpumap | xskmap | sockhash |\n"
1170                 "                 cgroup_storage | reuseport_sockarray | percpu_cgroup_storage }\n"
1171                 "       " HELP_SPEC_OPTIONS "\n"
1172                 "",
1173                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1174                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1175                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1176                 bin_name, argv[-2]);
1177
1178         return 0;
1179 }
1180
1181 static const struct cmd cmds[] = {
1182         { "show",       do_show },
1183         { "list",       do_show },
1184         { "help",       do_help },
1185         { "dump",       do_dump },
1186         { "update",     do_update },
1187         { "lookup",     do_lookup },
1188         { "getnext",    do_getnext },
1189         { "delete",     do_delete },
1190         { "pin",        do_pin },
1191         { "event_pipe", do_event_pipe },
1192         { "create",     do_create },
1193         { 0 }
1194 };
1195
1196 int do_map(int argc, char **argv)
1197 {
1198         return cmd_select(cmds, argc, argv, do_help);
1199 }