tools/bpf/bpftool/map.c

   1 /*
   2  * Copyright (C) 2017-2018 Netronome Systems, Inc.
   3  *
   4  * This software is dual licensed under the GNU General License Version 2,
   5  * June 1991 as shown in the file COPYING in the top-level directory of this
   6  * source tree or the BSD 2-Clause License provided below.  You have the
   7  * option to license this software under the complete terms of either license.
   8  *
   9  * The BSD 2-Clause License:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      1. Redistributions of source code must retain the above
  16  *         copyright notice, this list of conditions and the following
  17  *         disclaimer.
  18  *
  19  *      2. Redistributions in binary form must reproduce the above
  20  *         copyright notice, this list of conditions and the following
  21  *         disclaimer in the documentation and/or other materials
  22  *         provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  */
  33
  34 /* Author: Jakub Kicinski <kubakici@wp.pl> */
  35
  36 #include <assert.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <fcntl.h>
  40 #include <stdbool.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <sys/types.h>
  46 #include <sys/stat.h>
  47
  48 #include <bpf.h>
  49
  50 #include "main.h"
  51
  52 static const char * const map_type_name[] = {
  53         [BPF_MAP_TYPE_UNSPEC]           = "unspec",
  54         [BPF_MAP_TYPE_HASH]             = "hash",
  55         [BPF_MAP_TYPE_ARRAY]            = "array",
  56         [BPF_MAP_TYPE_PROG_ARRAY]       = "prog_array",
  57         [BPF_MAP_TYPE_PERF_EVENT_ARRAY] = "perf_event_array",
  58         [BPF_MAP_TYPE_PERCPU_HASH]      = "percpu_hash",
  59         [BPF_MAP_TYPE_PERCPU_ARRAY]     = "percpu_array",
  60         [BPF_MAP_TYPE_STACK_TRACE]      = "stack_trace",
  61         [BPF_MAP_TYPE_CGROUP_ARRAY]     = "cgroup_array",
  62         [BPF_MAP_TYPE_LRU_HASH]         = "lru_hash",
  63         [BPF_MAP_TYPE_LRU_PERCPU_HASH]  = "lru_percpu_hash",
  64         [BPF_MAP_TYPE_LPM_TRIE]         = "lpm_trie",
  65         [BPF_MAP_TYPE_ARRAY_OF_MAPS]    = "array_of_maps",
  66         [BPF_MAP_TYPE_HASH_OF_MAPS]     = "hash_of_maps",
  67         [BPF_MAP_TYPE_DEVMAP]           = "devmap",
  68         [BPF_MAP_TYPE_SOCKMAP]          = "sockmap",
  69         [BPF_MAP_TYPE_CPUMAP]           = "cpumap",
  70 };
  71
  72 static unsigned int get_possible_cpus(void)
  73 {
  74         static unsigned int result;
  75         char buf[128];
  76         long int n;
  77         char *ptr;
  78         int fd;
  79
  80         if (result)
  81                 return result;
  82
  83         fd = open("/sys/devices/system/cpu/possible", O_RDONLY);
  84         if (fd < 0) {
  85                 p_err("can't open sysfs possible cpus");
  86                 exit(-1);
  87         }
  88
  89         n = read(fd, buf, sizeof(buf));
  90         if (n < 2) {
  91                 p_err("can't read sysfs possible cpus");
  92                 exit(-1);
  93         }
  94         close(fd);
  95
  96         if (n == sizeof(buf)) {
  97                 p_err("read sysfs possible cpus overflow");
  98                 exit(-1);
  99         }
 100
 101         ptr = buf;
 102         n = 0;
 103         while (*ptr && *ptr != '\n') {
 104                 unsigned int a, b;
 105
 106                 if (sscanf(ptr, "%u-%u", &a, &b) == 2) {
 107                         n += b - a + 1;
 108
 109                         ptr = strchr(ptr, '-') + 1;
 110                 } else if (sscanf(ptr, "%u", &a) == 1) {
 111                         n++;
 112                 } else {
 113                         assert(0);
 114                 }
 115
 116                 while (isdigit(*ptr))
 117                         ptr++;
 118                 if (*ptr == ',')
 119                         ptr++;
 120         }
 121
 122         result = n;
 123
 124         return result;
 125 }
 126
 127 static bool map_is_per_cpu(__u32 type)
 128 {
 129         return type == BPF_MAP_TYPE_PERCPU_HASH ||
 130                type == BPF_MAP_TYPE_PERCPU_ARRAY ||
 131                type == BPF_MAP_TYPE_LRU_PERCPU_HASH;
 132 }
 133
 134 static bool map_is_map_of_maps(__u32 type)
 135 {
 136         return type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
 137                type == BPF_MAP_TYPE_HASH_OF_MAPS;
 138 }
 139
 140 static bool map_is_map_of_progs(__u32 type)
 141 {
 142         return type == BPF_MAP_TYPE_PROG_ARRAY;
 143 }
 144
 145 static void *alloc_value(struct bpf_map_info *info)
 146 {
 147         if (map_is_per_cpu(info->type))
 148                 return malloc(info->value_size * get_possible_cpus());
 149         else
 150                 return malloc(info->value_size);
 151 }
 152
 153 static int map_parse_fd(int *argc, char ***argv)
 154 {
 155         int fd;
 156
 157         if (is_prefix(**argv, "id")) {
 158                 unsigned int id;
 159                 char *endptr;
 160
 161                 NEXT_ARGP();
 162
 163                 id = strtoul(**argv, &endptr, 0);
 164                 if (*endptr) {
 165                         p_err("can't parse %s as ID", **argv);
 166                         return -1;
 167                 }
 168                 NEXT_ARGP();
 169
 170                 fd = bpf_map_get_fd_by_id(id);
 171                 if (fd < 0)
 172                         p_err("get map by id (%u): %s", id, strerror(errno));
 173                 return fd;
 174         } else if (is_prefix(**argv, "pinned")) {
 175                 char *path;
 176
 177                 NEXT_ARGP();
 178
 179                 path = **argv;
 180                 NEXT_ARGP();
 181
 182                 return open_obj_pinned_any(path, BPF_OBJ_MAP);
 183         }
 184
 185         p_err("expected 'id' or 'pinned', got: '%s'?", **argv);
 186         return -1;
 187 }
 188
 189 static int
 190 map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
 191 {
 192         int err;
 193         int fd;
 194
 195         fd = map_parse_fd(argc, argv);
 196         if (fd < 0)
 197                 return -1;
 198
 199         err = bpf_obj_get_info_by_fd(fd, info, info_len);
 200         if (err) {
 201                 p_err("can't get map info: %s", strerror(errno));
 202                 close(fd);
 203                 return err;
 204         }
 205
 206         return fd;
 207 }
 208
 209 static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
 210                              unsigned char *value)
 211 {
 212         jsonw_start_object(json_wtr);
 213
 214         if (!map_is_per_cpu(info->type)) {
 215                 jsonw_name(json_wtr, "key");
 216                 print_hex_data_json(key, info->key_size);
 217                 jsonw_name(json_wtr, "value");
 218                 print_hex_data_json(value, info->value_size);
 219         } else {
 220                 unsigned int i, n;
 221
 222                 n = get_possible_cpus();
 223
 224                 jsonw_name(json_wtr, "key");
 225                 print_hex_data_json(key, info->key_size);
 226
 227                 jsonw_name(json_wtr, "values");
 228                 jsonw_start_array(json_wtr);
 229                 for (i = 0; i < n; i++) {
 230                         jsonw_start_object(json_wtr);
 231
 232                         jsonw_int_field(json_wtr, "cpu", i);
 233
 234                         jsonw_name(json_wtr, "value");
 235                         print_hex_data_json(value + i * info->value_size,
 236                                             info->value_size);
 237
 238                         jsonw_end_object(json_wtr);
 239                 }
 240                 jsonw_end_array(json_wtr);
 241         }
 242
 243         jsonw_end_object(json_wtr);
 244 }
 245
 246 static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
 247                               unsigned char *value)
 248 {
 249         if (!map_is_per_cpu(info->type)) {
 250                 bool single_line, break_names;
 251
 252                 break_names = info->key_size > 16 || info->value_size > 16;
 253                 single_line = info->key_size + info->value_size <= 24 &&
 254                         !break_names;
 255
 256                 printf("key:%c", break_names ? '\n' : ' ');
 257                 fprint_hex(stdout, key, info->key_size, " ");
 258
 259                 printf(single_line ? "  " : "\n");
 260
 261                 printf("value:%c", break_names ? '\n' : ' ');
 262                 fprint_hex(stdout, value, info->value_size, " ");
 263
 264                 printf("\n");
 265         } else {
 266                 unsigned int i, n;
 267
 268                 n = get_possible_cpus();
 269
 270                 printf("key:\n");
 271                 fprint_hex(stdout, key, info->key_size, " ");
 272                 printf("\n");
 273                 for (i = 0; i < n; i++) {
 274                         printf("value (CPU %02d):%c",
 275                                i, info->value_size > 16 ? '\n' : ' ');
 276                         fprint_hex(stdout, value + i * info->value_size,
 277                                    info->value_size, " ");
 278                         printf("\n");
 279                 }
 280         }
 281 }
 282
 283 static char **parse_bytes(char **argv, const char *name, unsigned char *val,
 284                           unsigned int n)
 285 {
 286         unsigned int i = 0, base = 0;
 287         char *endptr;
 288
 289         if (is_prefix(*argv, "hex")) {
 290                 base = 16;
 291                 argv++;
 292         }
 293
 294         while (i < n && argv[i]) {
 295                 val[i] = strtoul(argv[i], &endptr, base);
 296                 if (*endptr) {
 297                         p_err("error parsing byte: %s", argv[i]);
 298                         return NULL;
 299                 }
 300                 i++;
 301         }
 302
 303         if (i != n) {
 304                 p_err("%s expected %d bytes got %d", name, n, i);
 305                 return NULL;
 306         }
 307
 308         return argv + i;
 309 }
 310
 311 static int parse_elem(char **argv, struct bpf_map_info *info,
 312                       void *key, void *value, __u32 key_size, __u32 value_size,
 313                       __u32 *flags, __u32 **value_fd)
 314 {
 315         if (!*argv) {
 316                 if (!key && !value)
 317                         return 0;
 318                 p_err("did not find %s", key ? "key" : "value");
 319                 return -1;
 320         }
 321
 322         if (is_prefix(*argv, "key")) {
 323                 if (!key) {
 324                         if (key_size)
 325                                 p_err("duplicate key");
 326                         else
 327                                 p_err("unnecessary key");
 328                         return -1;
 329                 }
 330
 331                 argv = parse_bytes(argv + 1, "key", key, key_size);
 332                 if (!argv)
 333                         return -1;
 334
 335                 return parse_elem(argv, info, NULL, value, key_size, value_size,
 336                                   flags, value_fd);
 337         } else if (is_prefix(*argv, "value")) {
 338                 int fd;
 339
 340                 if (!value) {
 341                         if (value_size)
 342                                 p_err("duplicate value");
 343                         else
 344                                 p_err("unnecessary value");
 345                         return -1;
 346                 }
 347
 348                 argv++;
 349
 350                 if (map_is_map_of_maps(info->type)) {
 351                         int argc = 2;
 352
 353                         if (value_size != 4) {
 354                                 p_err("value smaller than 4B for map in map?");
 355                                 return -1;
 356                         }
 357                         if (!argv[0] || !argv[1]) {
 358                                 p_err("not enough value arguments for map in map");
 359                                 return -1;
 360                         }
 361
 362                         fd = map_parse_fd(&argc, &argv);
 363                         if (fd < 0)
 364                                 return -1;
 365
 366                         *value_fd = value;
 367                         **value_fd = fd;
 368                 } else if (map_is_map_of_progs(info->type)) {
 369                         int argc = 2;
 370
 371                         if (value_size != 4) {
 372                                 p_err("value smaller than 4B for map of progs?");
 373                                 return -1;
 374                         }
 375                         if (!argv[0] || !argv[1]) {
 376                                 p_err("not enough value arguments for map of progs");
 377                                 return -1;
 378                         }
 379
 380                         fd = prog_parse_fd(&argc, &argv);
 381                         if (fd < 0)
 382                                 return -1;
 383
 384                         *value_fd = value;
 385                         **value_fd = fd;
 386                 } else {
 387                         argv = parse_bytes(argv, "value", value, value_size);
 388                         if (!argv)
 389                                 return -1;
 390                 }
 391
 392                 return parse_elem(argv, info, key, NULL, key_size, value_size,
 393                                   flags, NULL);
 394         } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") ||
 395                    is_prefix(*argv, "exist")) {
 396                 if (!flags) {
 397                         p_err("flags specified multiple times: %s", *argv);
 398                         return -1;
 399                 }
 400
 401                 if (is_prefix(*argv, "any"))
 402                         *flags = BPF_ANY;
 403                 else if (is_prefix(*argv, "noexist"))
 404                         *flags = BPF_NOEXIST;
 405                 else if (is_prefix(*argv, "exist"))
 406                         *flags = BPF_EXIST;
 407
 408                 return parse_elem(argv + 1, info, key, value, key_size,
 409                                   value_size, NULL, value_fd);
 410         }
 411
 412         p_err("expected key or value, got: %s", *argv);
 413         return -1;
 414 }
 415
 416 static int show_map_close_json(int fd, struct bpf_map_info *info)
 417 {
 418         char *memlock;
 419
 420         memlock = get_fdinfo(fd, "memlock");
 421         close(fd);
 422
 423         jsonw_start_object(json_wtr);
 424
 425         jsonw_uint_field(json_wtr, "id", info->id);
 426         if (info->type < ARRAY_SIZE(map_type_name))
 427                 jsonw_string_field(json_wtr, "type",
 428                                    map_type_name[info->type]);
 429         else
 430                 jsonw_uint_field(json_wtr, "type", info->type);
 431
 432         if (*info->name)
 433                 jsonw_string_field(json_wtr, "name", info->name);
 434
 435         jsonw_name(json_wtr, "flags");
 436         jsonw_printf(json_wtr, "%d", info->map_flags);
 437
 438         print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
 439
 440         jsonw_uint_field(json_wtr, "bytes_key", info->key_size);
 441         jsonw_uint_field(json_wtr, "bytes_value", info->value_size);
 442         jsonw_uint_field(json_wtr, "max_entries", info->max_entries);
 443
 444         if (memlock)
 445                 jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
 446         free(memlock);
 447
 448         if (!hash_empty(map_table.table)) {
 449                 struct pinned_obj *obj;
 450
 451                 jsonw_name(json_wtr, "pinned");
 452                 jsonw_start_array(json_wtr);
 453                 hash_for_each_possible(map_table.table, obj, hash, info->id) {
 454                         if (obj->id == info->id)
 455                                 jsonw_string(json_wtr, obj->path);
 456                 }
 457                 jsonw_end_array(json_wtr);
 458         }
 459
 460         jsonw_end_object(json_wtr);
 461
 462         return 0;
 463 }
 464
 465 static int show_map_close_plain(int fd, struct bpf_map_info *info)
 466 {
 467         char *memlock;
 468
 469         memlock = get_fdinfo(fd, "memlock");
 470         close(fd);
 471
 472         printf("%u: ", info->id);
 473         if (info->type < ARRAY_SIZE(map_type_name))
 474                 printf("%s  ", map_type_name[info->type]);
 475         else
 476                 printf("type %u  ", info->type);
 477
 478         if (*info->name)
 479                 printf("name %s  ", info->name);
 480
 481         printf("flags 0x%x", info->map_flags);
 482         print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
 483         printf("\n");
 484         printf("\tkey %uB  value %uB  max_entries %u",
 485                info->key_size, info->value_size, info->max_entries);
 486
 487         if (memlock)
 488                 printf("  memlock %sB", memlock);
 489         free(memlock);
 490
 491         printf("\n");
 492         if (!hash_empty(map_table.table)) {
 493                 struct pinned_obj *obj;
 494
 495                 hash_for_each_possible(map_table.table, obj, hash, info->id) {
 496                         if (obj->id == info->id)
 497                                 printf("\tpinned %s\n", obj->path);
 498                 }
 499         }
 500         return 0;
 501 }
 502
 503 static int do_show(int argc, char **argv)
 504 {
 505         struct bpf_map_info info = {};
 506         __u32 len = sizeof(info);
 507         __u32 id = 0;
 508         int err;
 509         int fd;
 510
 511         if (show_pinned)
 512                 build_pinned_obj_table(&map_table, BPF_OBJ_MAP);
 513
 514         if (argc == 2) {
 515                 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 516                 if (fd < 0)
 517                         return -1;
 518
 519                 if (json_output)
 520                         return show_map_close_json(fd, &info);
 521                 else
 522                         return show_map_close_plain(fd, &info);
 523         }
 524
 525         if (argc)
 526                 return BAD_ARG();
 527
 528         if (json_output)
 529                 jsonw_start_array(json_wtr);
 530         while (true) {
 531                 err = bpf_map_get_next_id(id, &id);
 532                 if (err) {
 533                         if (errno == ENOENT)
 534                                 break;
 535                         p_err("can't get next map: %s%s", strerror(errno),
 536                               errno == EINVAL ? " -- kernel too old?" : "");
 537                         break;
 538                 }
 539
 540                 fd = bpf_map_get_fd_by_id(id);
 541                 if (fd < 0) {
 542                         if (errno == ENOENT)
 543                                 continue;
 544                         p_err("can't get map by id (%u): %s",
 545                               id, strerror(errno));
 546                         break;
 547                 }
 548
 549                 err = bpf_obj_get_info_by_fd(fd, &info, &len);
 550                 if (err) {
 551                         p_err("can't get map info: %s", strerror(errno));
 552                         close(fd);
 553                         break;
 554                 }
 555
 556                 if (json_output)
 557                         show_map_close_json(fd, &info);
 558                 else
 559                         show_map_close_plain(fd, &info);
 560         }
 561         if (json_output)
 562                 jsonw_end_array(json_wtr);
 563
 564         return errno == ENOENT ? 0 : -1;
 565 }
 566
 567 static int do_dump(int argc, char **argv)
 568 {
 569         void *key, *value, *prev_key;
 570         unsigned int num_elems = 0;
 571         struct bpf_map_info info = {};
 572         __u32 len = sizeof(info);
 573         int err;
 574         int fd;
 575
 576         if (argc != 2)
 577                 usage();
 578
 579         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 580         if (fd < 0)
 581                 return -1;
 582
 583         if (map_is_map_of_maps(info.type) || map_is_map_of_progs(info.type)) {
 584                 p_err("Dumping maps of maps and program maps not supported");
 585                 close(fd);
 586                 return -1;
 587         }
 588
 589         key = malloc(info.key_size);
 590         value = alloc_value(&info);
 591         if (!key || !value) {
 592                 p_err("mem alloc failed");
 593                 err = -1;
 594                 goto exit_free;
 595         }
 596
 597         prev_key = NULL;
 598         if (json_output)
 599                 jsonw_start_array(json_wtr);
 600         while (true) {
 601                 err = bpf_map_get_next_key(fd, prev_key, key);
 602                 if (err) {
 603                         if (errno == ENOENT)
 604                                 err = 0;
 605                         break;
 606                 }
 607
 608                 if (!bpf_map_lookup_elem(fd, key, value)) {
 609                         if (json_output)
 610                                 print_entry_json(&info, key, value);
 611                         else
 612                                 print_entry_plain(&info, key, value);
 613                 } else {
 614                         if (json_output) {
 615                                 jsonw_name(json_wtr, "key");
 616                                 print_hex_data_json(key, info.key_size);
 617                                 jsonw_name(json_wtr, "value");
 618                                 jsonw_start_object(json_wtr);
 619                                 jsonw_string_field(json_wtr, "error",
 620                                                    "can't lookup element");
 621                                 jsonw_end_object(json_wtr);
 622                         } else {
 623                                 p_info("can't lookup element with key: ");
 624                                 fprint_hex(stderr, key, info.key_size, " ");
 625                                 fprintf(stderr, "\n");
 626                         }
 627                 }
 628
 629                 prev_key = key;
 630                 num_elems++;
 631         }
 632
 633         if (json_output)
 634                 jsonw_end_array(json_wtr);
 635         else
 636                 printf("Found %u element%s\n", num_elems,
 637                        num_elems != 1 ? "s" : "");
 638
 639 exit_free:
 640         free(key);
 641         free(value);
 642         close(fd);
 643
 644         return err;
 645 }
 646
 647 static int do_update(int argc, char **argv)
 648 {
 649         struct bpf_map_info info = {};
 650         __u32 len = sizeof(info);
 651         __u32 *value_fd = NULL;
 652         __u32 flags = BPF_ANY;
 653         void *key, *value;
 654         int fd, err;
 655
 656         if (argc < 2)
 657                 usage();
 658
 659         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 660         if (fd < 0)
 661                 return -1;
 662
 663         key = malloc(info.key_size);
 664         value = alloc_value(&info);
 665         if (!key || !value) {
 666                 p_err("mem alloc failed");
 667                 err = -1;
 668                 goto exit_free;
 669         }
 670
 671         err = parse_elem(argv, &info, key, value, info.key_size,
 672                          info.value_size, &flags, &value_fd);
 673         if (err)
 674                 goto exit_free;
 675
 676         err = bpf_map_update_elem(fd, key, value, flags);
 677         if (err) {
 678                 p_err("update failed: %s", strerror(errno));
 679                 goto exit_free;
 680         }
 681
 682 exit_free:
 683         if (value_fd)
 684                 close(*value_fd);
 685         free(key);
 686         free(value);
 687         close(fd);
 688
 689         if (!err && json_output)
 690                 jsonw_null(json_wtr);
 691         return err;
 692 }
 693
 694 static int do_lookup(int argc, char **argv)
 695 {
 696         struct bpf_map_info info = {};
 697         __u32 len = sizeof(info);
 698         void *key, *value;
 699         int err;
 700         int fd;
 701
 702         if (argc < 2)
 703                 usage();
 704
 705         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 706         if (fd < 0)
 707                 return -1;
 708
 709         key = malloc(info.key_size);
 710         value = alloc_value(&info);
 711         if (!key || !value) {
 712                 p_err("mem alloc failed");
 713                 err = -1;
 714                 goto exit_free;
 715         }
 716
 717         err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
 718         if (err)
 719                 goto exit_free;
 720
 721         err = bpf_map_lookup_elem(fd, key, value);
 722         if (!err) {
 723                 if (json_output)
 724                         print_entry_json(&info, key, value);
 725                 else
 726                         print_entry_plain(&info, key, value);
 727         } else if (errno == ENOENT) {
 728                 if (json_output) {
 729                         jsonw_null(json_wtr);
 730                 } else {
 731                         printf("key:\n");
 732                         fprint_hex(stdout, key, info.key_size, " ");
 733                         printf("\n\nNot found\n");
 734                 }
 735         } else {
 736                 p_err("lookup failed: %s", strerror(errno));
 737         }
 738
 739 exit_free:
 740         free(key);
 741         free(value);
 742         close(fd);
 743
 744         return err;
 745 }
 746
 747 static int do_getnext(int argc, char **argv)
 748 {
 749         struct bpf_map_info info = {};
 750         __u32 len = sizeof(info);
 751         void *key, *nextkey;
 752         int err;
 753         int fd;
 754
 755         if (argc < 2)
 756                 usage();
 757
 758         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 759         if (fd < 0)
 760                 return -1;
 761
 762         key = malloc(info.key_size);
 763         nextkey = malloc(info.key_size);
 764         if (!key || !nextkey) {
 765                 p_err("mem alloc failed");
 766                 err = -1;
 767                 goto exit_free;
 768         }
 769
 770         if (argc) {
 771                 err = parse_elem(argv, &info, key, NULL, info.key_size, 0,
 772                                  NULL, NULL);
 773                 if (err)
 774                         goto exit_free;
 775         } else {
 776                 free(key);
 777                 key = NULL;
 778         }
 779
 780         err = bpf_map_get_next_key(fd, key, nextkey);
 781         if (err) {
 782                 p_err("can't get next key: %s", strerror(errno));
 783                 goto exit_free;
 784         }
 785
 786         if (json_output) {
 787                 jsonw_start_object(json_wtr);
 788                 if (key) {
 789                         jsonw_name(json_wtr, "key");
 790                         print_hex_data_json(key, info.key_size);
 791                 } else {
 792                         jsonw_null_field(json_wtr, "key");
 793                 }
 794                 jsonw_name(json_wtr, "next_key");
 795                 print_hex_data_json(nextkey, info.key_size);
 796                 jsonw_end_object(json_wtr);
 797         } else {
 798                 if (key) {
 799                         printf("key:\n");
 800                         fprint_hex(stdout, key, info.key_size, " ");
 801                         printf("\n");
 802                 } else {
 803                         printf("key: None\n");
 804                 }
 805                 printf("next key:\n");
 806                 fprint_hex(stdout, nextkey, info.key_size, " ");
 807                 printf("\n");
 808         }
 809
 810 exit_free:
 811         free(nextkey);
 812         free(key);
 813         close(fd);
 814
 815         return err;
 816 }
 817
 818 static int do_delete(int argc, char **argv)
 819 {
 820         struct bpf_map_info info = {};
 821         __u32 len = sizeof(info);
 822         void *key;
 823         int err;
 824         int fd;
 825
 826         if (argc < 2)
 827                 usage();
 828
 829         fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
 830         if (fd < 0)
 831                 return -1;
 832
 833         key = malloc(info.key_size);
 834         if (!key) {
 835                 p_err("mem alloc failed");
 836                 err = -1;
 837                 goto exit_free;
 838         }
 839
 840         err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
 841         if (err)
 842                 goto exit_free;
 843
 844         err = bpf_map_delete_elem(fd, key);
 845         if (err)
 846                 p_err("delete failed: %s", strerror(errno));
 847
 848 exit_free:
 849         free(key);
 850         close(fd);
 851
 852         if (!err && json_output)
 853                 jsonw_null(json_wtr);
 854         return err;
 855 }
 856
 857 static int do_pin(int argc, char **argv)
 858 {
 859         int err;
 860
 861         err = do_pin_any(argc, argv, bpf_map_get_fd_by_id);
 862         if (!err && json_output)
 863                 jsonw_null(json_wtr);
 864         return err;
 865 }
 866
 867 static int do_help(int argc, char **argv)
 868 {
 869         if (json_output) {
 870                 jsonw_null(json_wtr);
 871                 return 0;
 872         }
 873
 874         fprintf(stderr,
 875                 "Usage: %s %s { show | list }   [MAP]\n"
 876                 "       %s %s dump    MAP\n"
 877                 "       %s %s update  MAP  key DATA value VALUE [UPDATE_FLAGS]\n"
 878                 "       %s %s lookup  MAP  key DATA\n"
 879                 "       %s %s getnext MAP [key DATA]\n"
 880                 "       %s %s delete  MAP  key DATA\n"
 881                 "       %s %s pin     MAP  FILE\n"
 882                 "       %s %s help\n"
 883                 "\n"
 884                 "       MAP := { id MAP_ID | pinned FILE }\n"
 885                 "       DATA := { [hex] BYTES }\n"
 886                 "       " HELP_SPEC_PROGRAM "\n"
 887                 "       VALUE := { DATA | MAP | PROG }\n"
 888                 "       UPDATE_FLAGS := { any | exist | noexist }\n"
 889                 "       " HELP_SPEC_OPTIONS "\n"
 890                 "",
 891                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
 892                 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
 893                 bin_name, argv[-2], bin_name, argv[-2]);
 894
 895         return 0;
 896 }
 897
 898 static const struct cmd cmds[] = {
 899         { "show",       do_show },
 900         { "list",       do_show },
 901         { "help",       do_help },
 902         { "dump",       do_dump },
 903         { "update",     do_update },
 904         { "lookup",     do_lookup },
 905         { "getnext",    do_getnext },
 906         { "delete",     do_delete },
 907         { "pin",        do_pin },
 908         { 0 }
 909 };
 910
 911 int do_map(int argc, char **argv)
 912 {
 913         return cmd_select(cmds, argc, argv, do_help);
 914 }