1
2
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/bpf.h>
19#include <bpf/btf.h>
20
21#include "json_writer.h"
22#include "main.h"
23
24const 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_DEVMAP_HASH] = "devmap_hash",
41 [BPF_MAP_TYPE_SOCKMAP] = "sockmap",
42 [BPF_MAP_TYPE_CPUMAP] = "cpumap",
43 [BPF_MAP_TYPE_XSKMAP] = "xskmap",
44 [BPF_MAP_TYPE_SOCKHASH] = "sockhash",
45 [BPF_MAP_TYPE_CGROUP_STORAGE] = "cgroup_storage",
46 [BPF_MAP_TYPE_REUSEPORT_SOCKARRAY] = "reuseport_sockarray",
47 [BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE] = "percpu_cgroup_storage",
48 [BPF_MAP_TYPE_QUEUE] = "queue",
49 [BPF_MAP_TYPE_STACK] = "stack",
50 [BPF_MAP_TYPE_SK_STORAGE] = "sk_storage",
51 [BPF_MAP_TYPE_STRUCT_OPS] = "struct_ops",
52};
53
54const size_t map_type_name_size = ARRAY_SIZE(map_type_name);
55
56static bool map_is_per_cpu(__u32 type)
57{
58 return type == BPF_MAP_TYPE_PERCPU_HASH ||
59 type == BPF_MAP_TYPE_PERCPU_ARRAY ||
60 type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
61 type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
62}
63
64static bool map_is_map_of_maps(__u32 type)
65{
66 return type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
67 type == BPF_MAP_TYPE_HASH_OF_MAPS;
68}
69
70static bool map_is_map_of_progs(__u32 type)
71{
72 return type == BPF_MAP_TYPE_PROG_ARRAY;
73}
74
75static int map_type_from_str(const char *type)
76{
77 unsigned int i;
78
79 for (i = 0; i < ARRAY_SIZE(map_type_name); i++)
80
81 if (map_type_name[i] && !strcmp(map_type_name[i], type))
82 return i;
83 return -1;
84}
85
86static void *alloc_value(struct bpf_map_info *info)
87{
88 if (map_is_per_cpu(info->type))
89 return malloc(round_up(info->value_size, 8) *
90 get_possible_cpus());
91 else
92 return malloc(info->value_size);
93}
94
95static int map_fd_by_name(char *name, int **fds)
96{
97 unsigned int id = 0;
98 int fd, nb_fds = 0;
99 void *tmp;
100 int err;
101
102 while (true) {
103 struct bpf_map_info info = {};
104 __u32 len = sizeof(info);
105
106 err = bpf_map_get_next_id(id, &id);
107 if (err) {
108 if (errno != ENOENT) {
109 p_err("%s", strerror(errno));
110 goto err_close_fds;
111 }
112 return nb_fds;
113 }
114
115 fd = bpf_map_get_fd_by_id(id);
116 if (fd < 0) {
117 p_err("can't get map by id (%u): %s",
118 id, strerror(errno));
119 goto err_close_fds;
120 }
121
122 err = bpf_obj_get_info_by_fd(fd, &info, &len);
123 if (err) {
124 p_err("can't get map info (%u): %s",
125 id, strerror(errno));
126 goto err_close_fd;
127 }
128
129 if (strncmp(name, info.name, BPF_OBJ_NAME_LEN)) {
130 close(fd);
131 continue;
132 }
133
134 if (nb_fds > 0) {
135 tmp = realloc(*fds, (nb_fds + 1) * sizeof(int));
136 if (!tmp) {
137 p_err("failed to realloc");
138 goto err_close_fd;
139 }
140 *fds = tmp;
141 }
142 (*fds)[nb_fds++] = fd;
143 }
144
145err_close_fd:
146 close(fd);
147err_close_fds:
148 while (--nb_fds >= 0)
149 close((*fds)[nb_fds]);
150 return -1;
151}
152
153static int map_parse_fds(int *argc, char ***argv, int **fds)
154{
155 if (is_prefix(**argv, "id")) {
156 unsigned int id;
157 char *endptr;
158
159 NEXT_ARGP();
160
161 id = strtoul(**argv, &endptr, 0);
162 if (*endptr) {
163 p_err("can't parse %s as ID", **argv);
164 return -1;
165 }
166 NEXT_ARGP();
167
168 (*fds)[0] = bpf_map_get_fd_by_id(id);
169 if ((*fds)[0] < 0) {
170 p_err("get map by id (%u): %s", id, strerror(errno));
171 return -1;
172 }
173 return 1;
174 } else if (is_prefix(**argv, "name")) {
175 char *name;
176
177 NEXT_ARGP();
178
179 name = **argv;
180 if (strlen(name) > BPF_OBJ_NAME_LEN - 1) {
181 p_err("can't parse name");
182 return -1;
183 }
184 NEXT_ARGP();
185
186 return map_fd_by_name(name, fds);
187 } else if (is_prefix(**argv, "pinned")) {
188 char *path;
189
190 NEXT_ARGP();
191
192 path = **argv;
193 NEXT_ARGP();
194
195 (*fds)[0] = open_obj_pinned_any(path, BPF_OBJ_MAP);
196 if ((*fds)[0] < 0)
197 return -1;
198 return 1;
199 }
200
201 p_err("expected 'id', 'name' or 'pinned', got: '%s'?", **argv);
202 return -1;
203}
204
205int map_parse_fd(int *argc, char ***argv)
206{
207 int *fds = NULL;
208 int nb_fds, fd;
209
210 fds = malloc(sizeof(int));
211 if (!fds) {
212 p_err("mem alloc failed");
213 return -1;
214 }
215 nb_fds = map_parse_fds(argc, argv, &fds);
216 if (nb_fds != 1) {
217 if (nb_fds > 1) {
218 p_err("several maps match this handle");
219 while (nb_fds--)
220 close(fds[nb_fds]);
221 }
222 fd = -1;
223 goto exit_free;
224 }
225
226 fd = fds[0];
227exit_free:
228 free(fds);
229 return fd;
230}
231
232int map_parse_fd_and_info(int *argc, char ***argv, void *info, __u32 *info_len)
233{
234 int err;
235 int fd;
236
237 fd = map_parse_fd(argc, argv);
238 if (fd < 0)
239 return -1;
240
241 err = bpf_obj_get_info_by_fd(fd, info, info_len);
242 if (err) {
243 p_err("can't get map info: %s", strerror(errno));
244 close(fd);
245 return err;
246 }
247
248 return fd;
249}
250
251static int do_dump_btf(const struct btf_dumper *d,
252 struct bpf_map_info *map_info, void *key,
253 void *value)
254{
255 __u32 value_id;
256 int ret;
257
258
259 jsonw_start_object(d->jw);
260
261 if (map_info->btf_key_type_id) {
262 jsonw_name(d->jw, "key");
263
264 ret = btf_dumper_type(d, map_info->btf_key_type_id, key);
265 if (ret)
266 goto err_end_obj;
267 }
268
269 value_id = map_info->btf_vmlinux_value_type_id ?
270 : map_info->btf_value_type_id;
271
272 if (!map_is_per_cpu(map_info->type)) {
273 jsonw_name(d->jw, "value");
274 ret = btf_dumper_type(d, value_id, value);
275 } else {
276 unsigned int i, n, step;
277
278 jsonw_name(d->jw, "values");
279 jsonw_start_array(d->jw);
280 n = get_possible_cpus();
281 step = round_up(map_info->value_size, 8);
282 for (i = 0; i < n; i++) {
283 jsonw_start_object(d->jw);
284 jsonw_int_field(d->jw, "cpu", i);
285 jsonw_name(d->jw, "value");
286 ret = btf_dumper_type(d, value_id, value + i * step);
287 jsonw_end_object(d->jw);
288 if (ret)
289 break;
290 }
291 jsonw_end_array(d->jw);
292 }
293
294err_end_obj:
295
296 jsonw_end_object(d->jw);
297
298 return ret;
299}
300
301static json_writer_t *get_btf_writer(void)
302{
303 json_writer_t *jw = jsonw_new(stdout);
304
305 if (!jw)
306 return NULL;
307 jsonw_pretty(jw, true);
308
309 return jw;
310}
311
312static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
313 unsigned char *value, struct btf *btf)
314{
315 jsonw_start_object(json_wtr);
316
317 if (!map_is_per_cpu(info->type)) {
318 jsonw_name(json_wtr, "key");
319 print_hex_data_json(key, info->key_size);
320 jsonw_name(json_wtr, "value");
321 print_hex_data_json(value, info->value_size);
322 if (btf) {
323 struct btf_dumper d = {
324 .btf = btf,
325 .jw = json_wtr,
326 .is_plain_text = false,
327 };
328
329 jsonw_name(json_wtr, "formatted");
330 do_dump_btf(&d, info, key, value);
331 }
332 } else {
333 unsigned int i, n, step;
334
335 n = get_possible_cpus();
336 step = round_up(info->value_size, 8);
337
338 jsonw_name(json_wtr, "key");
339 print_hex_data_json(key, info->key_size);
340
341 jsonw_name(json_wtr, "values");
342 jsonw_start_array(json_wtr);
343 for (i = 0; i < n; i++) {
344 jsonw_start_object(json_wtr);
345
346 jsonw_int_field(json_wtr, "cpu", i);
347
348 jsonw_name(json_wtr, "value");
349 print_hex_data_json(value + i * step,
350 info->value_size);
351
352 jsonw_end_object(json_wtr);
353 }
354 jsonw_end_array(json_wtr);
355 if (btf) {
356 struct btf_dumper d = {
357 .btf = btf,
358 .jw = json_wtr,
359 .is_plain_text = false,
360 };
361
362 jsonw_name(json_wtr, "formatted");
363 do_dump_btf(&d, info, key, value);
364 }
365 }
366
367 jsonw_end_object(json_wtr);
368}
369
370static void print_entry_error(struct bpf_map_info *info, unsigned char *key,
371 const char *error_msg)
372{
373 int msg_size = strlen(error_msg);
374 bool single_line, break_names;
375
376 break_names = info->key_size > 16 || msg_size > 16;
377 single_line = info->key_size + msg_size <= 24 && !break_names;
378
379 printf("key:%c", break_names ? '\n' : ' ');
380 fprint_hex(stdout, key, info->key_size, " ");
381
382 printf(single_line ? " " : "\n");
383
384 printf("value:%c%s", break_names ? '\n' : ' ', error_msg);
385
386 printf("\n");
387}
388
389static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
390 unsigned char *value)
391{
392 if (!map_is_per_cpu(info->type)) {
393 bool single_line, break_names;
394
395 break_names = info->key_size > 16 || info->value_size > 16;
396 single_line = info->key_size + info->value_size <= 24 &&
397 !break_names;
398
399 if (info->key_size) {
400 printf("key:%c", break_names ? '\n' : ' ');
401 fprint_hex(stdout, key, info->key_size, " ");
402
403 printf(single_line ? " " : "\n");
404 }
405
406 if (info->value_size) {
407 printf("value:%c", break_names ? '\n' : ' ');
408 fprint_hex(stdout, value, info->value_size, " ");
409 }
410
411 printf("\n");
412 } else {
413 unsigned int i, n, step;
414
415 n = get_possible_cpus();
416 step = round_up(info->value_size, 8);
417
418 if (info->key_size) {
419 printf("key:\n");
420 fprint_hex(stdout, key, info->key_size, " ");
421 printf("\n");
422 }
423 if (info->value_size) {
424 for (i = 0; i < n; i++) {
425 printf("value (CPU %02d):%c",
426 i, info->value_size > 16 ? '\n' : ' ');
427 fprint_hex(stdout, value + i * step,
428 info->value_size, " ");
429 printf("\n");
430 }
431 }
432 }
433}
434
435static char **parse_bytes(char **argv, const char *name, unsigned char *val,
436 unsigned int n)
437{
438 unsigned int i = 0, base = 0;
439 char *endptr;
440
441 if (is_prefix(*argv, "hex")) {
442 base = 16;
443 argv++;
444 }
445
446 while (i < n && argv[i]) {
447 val[i] = strtoul(argv[i], &endptr, base);
448 if (*endptr) {
449 p_err("error parsing byte: %s", argv[i]);
450 return NULL;
451 }
452 i++;
453 }
454
455 if (i != n) {
456 p_err("%s expected %d bytes got %d", name, n, i);
457 return NULL;
458 }
459
460 return argv + i;
461}
462
463
464static void fill_per_cpu_value(struct bpf_map_info *info, void *value)
465{
466 unsigned int i, n, step;
467
468 if (!map_is_per_cpu(info->type))
469 return;
470
471 n = get_possible_cpus();
472 step = round_up(info->value_size, 8);
473 for (i = 1; i < n; i++)
474 memcpy(value + i * step, value, info->value_size);
475}
476
477static int parse_elem(char **argv, struct bpf_map_info *info,
478 void *key, void *value, __u32 key_size, __u32 value_size,
479 __u32 *flags, __u32 **value_fd)
480{
481 if (!*argv) {
482 if (!key && !value)
483 return 0;
484 p_err("did not find %s", key ? "key" : "value");
485 return -1;
486 }
487
488 if (is_prefix(*argv, "key")) {
489 if (!key) {
490 if (key_size)
491 p_err("duplicate key");
492 else
493 p_err("unnecessary key");
494 return -1;
495 }
496
497 argv = parse_bytes(argv + 1, "key", key, key_size);
498 if (!argv)
499 return -1;
500
501 return parse_elem(argv, info, NULL, value, key_size, value_size,
502 flags, value_fd);
503 } else if (is_prefix(*argv, "value")) {
504 int fd;
505
506 if (!value) {
507 if (value_size)
508 p_err("duplicate value");
509 else
510 p_err("unnecessary value");
511 return -1;
512 }
513
514 argv++;
515
516 if (map_is_map_of_maps(info->type)) {
517 int argc = 2;
518
519 if (value_size != 4) {
520 p_err("value smaller than 4B for map in map?");
521 return -1;
522 }
523 if (!argv[0] || !argv[1]) {
524 p_err("not enough value arguments for map in map");
525 return -1;
526 }
527
528 fd = map_parse_fd(&argc, &argv);
529 if (fd < 0)
530 return -1;
531
532 *value_fd = value;
533 **value_fd = fd;
534 } else if (map_is_map_of_progs(info->type)) {
535 int argc = 2;
536
537 if (value_size != 4) {
538 p_err("value smaller than 4B for map of progs?");
539 return -1;
540 }
541 if (!argv[0] || !argv[1]) {
542 p_err("not enough value arguments for map of progs");
543 return -1;
544 }
545 if (is_prefix(*argv, "id"))
546 p_info("Warning: updating program array via MAP_ID, make sure this map is kept open\n"
547 " by some process or pinned otherwise update will be lost");
548
549 fd = prog_parse_fd(&argc, &argv);
550 if (fd < 0)
551 return -1;
552
553 *value_fd = value;
554 **value_fd = fd;
555 } else {
556 argv = parse_bytes(argv, "value", value, value_size);
557 if (!argv)
558 return -1;
559
560 fill_per_cpu_value(info, value);
561 }
562
563 return parse_elem(argv, info, key, NULL, key_size, value_size,
564 flags, NULL);
565 } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") ||
566 is_prefix(*argv, "exist")) {
567 if (!flags) {
568 p_err("flags specified multiple times: %s", *argv);
569 return -1;
570 }
571
572 if (is_prefix(*argv, "any"))
573 *flags = BPF_ANY;
574 else if (is_prefix(*argv, "noexist"))
575 *flags = BPF_NOEXIST;
576 else if (is_prefix(*argv, "exist"))
577 *flags = BPF_EXIST;
578
579 return parse_elem(argv + 1, info, key, value, key_size,
580 value_size, NULL, value_fd);
581 }
582
583 p_err("expected key or value, got: %s", *argv);
584 return -1;
585}
586
587static void show_map_header_json(struct bpf_map_info *info, json_writer_t *wtr)
588{
589 jsonw_uint_field(wtr, "id", info->id);
590 if (info->type < ARRAY_SIZE(map_type_name))
591 jsonw_string_field(wtr, "type", map_type_name[info->type]);
592 else
593 jsonw_uint_field(wtr, "type", info->type);
594
595 if (*info->name)
596 jsonw_string_field(wtr, "name", info->name);
597
598 jsonw_name(wtr, "flags");
599 jsonw_printf(wtr, "%d", info->map_flags);
600}
601
602static int show_map_close_json(int fd, struct bpf_map_info *info)
603{
604 char *memlock, *frozen_str;
605 int frozen = 0;
606
607 memlock = get_fdinfo(fd, "memlock");
608 frozen_str = get_fdinfo(fd, "frozen");
609
610 jsonw_start_object(json_wtr);
611
612 show_map_header_json(info, json_wtr);
613
614 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
615
616 jsonw_uint_field(json_wtr, "bytes_key", info->key_size);
617 jsonw_uint_field(json_wtr, "bytes_value", info->value_size);
618 jsonw_uint_field(json_wtr, "max_entries", info->max_entries);
619
620 if (memlock)
621 jsonw_int_field(json_wtr, "bytes_memlock", atoi(memlock));
622 free(memlock);
623
624 if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
625 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
626 char *owner_jited = get_fdinfo(fd, "owner_jited");
627
628 if (owner_prog_type) {
629 unsigned int prog_type = atoi(owner_prog_type);
630
631 if (prog_type < ARRAY_SIZE(prog_type_name))
632 jsonw_string_field(json_wtr, "owner_prog_type",
633 prog_type_name[prog_type]);
634 else
635 jsonw_uint_field(json_wtr, "owner_prog_type",
636 prog_type);
637 }
638 if (owner_jited)
639 jsonw_bool_field(json_wtr, "owner_jited",
640 !!atoi(owner_jited));
641
642 free(owner_prog_type);
643 free(owner_jited);
644 }
645 close(fd);
646
647 if (frozen_str) {
648 frozen = atoi(frozen_str);
649 free(frozen_str);
650 }
651 jsonw_int_field(json_wtr, "frozen", frozen);
652
653 if (info->btf_id)
654 jsonw_int_field(json_wtr, "btf_id", info->btf_id);
655
656 if (!hash_empty(map_table.table)) {
657 struct pinned_obj *obj;
658
659 jsonw_name(json_wtr, "pinned");
660 jsonw_start_array(json_wtr);
661 hash_for_each_possible(map_table.table, obj, hash, info->id) {
662 if (obj->id == info->id)
663 jsonw_string(json_wtr, obj->path);
664 }
665 jsonw_end_array(json_wtr);
666 }
667
668 jsonw_end_object(json_wtr);
669
670 return 0;
671}
672
673static void show_map_header_plain(struct bpf_map_info *info)
674{
675 printf("%u: ", info->id);
676 if (info->type < ARRAY_SIZE(map_type_name))
677 printf("%s ", map_type_name[info->type]);
678 else
679 printf("type %u ", info->type);
680
681 if (*info->name)
682 printf("name %s ", info->name);
683
684 printf("flags 0x%x", info->map_flags);
685 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
686 printf("\n");
687}
688
689static int show_map_close_plain(int fd, struct bpf_map_info *info)
690{
691 char *memlock, *frozen_str;
692 int frozen = 0;
693
694 memlock = get_fdinfo(fd, "memlock");
695 frozen_str = get_fdinfo(fd, "frozen");
696
697 show_map_header_plain(info);
698 printf("\tkey %uB value %uB max_entries %u",
699 info->key_size, info->value_size, info->max_entries);
700
701 if (memlock)
702 printf(" memlock %sB", memlock);
703 free(memlock);
704
705 if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
706 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
707 char *owner_jited = get_fdinfo(fd, "owner_jited");
708
709 if (owner_prog_type || owner_jited)
710 printf("\n\t");
711 if (owner_prog_type) {
712 unsigned int prog_type = atoi(owner_prog_type);
713
714 if (prog_type < ARRAY_SIZE(prog_type_name))
715 printf("owner_prog_type %s ",
716 prog_type_name[prog_type]);
717 else
718 printf("owner_prog_type %d ", prog_type);
719 }
720 if (owner_jited)
721 printf("owner%s jited",
722 atoi(owner_jited) ? "" : " not");
723
724 free(owner_prog_type);
725 free(owner_jited);
726 }
727 close(fd);
728
729 if (!hash_empty(map_table.table)) {
730 struct pinned_obj *obj;
731
732 hash_for_each_possible(map_table.table, obj, hash, info->id) {
733 if (obj->id == info->id)
734 printf("\n\tpinned %s", obj->path);
735 }
736 }
737 printf("\n");
738
739 if (frozen_str) {
740 frozen = atoi(frozen_str);
741 free(frozen_str);
742 }
743
744 if (!info->btf_id && !frozen)
745 return 0;
746
747 printf("\t");
748
749 if (info->btf_id)
750 printf("btf_id %d", info->btf_id);
751
752 if (frozen)
753 printf("%sfrozen", info->btf_id ? " " : "");
754
755 printf("\n");
756 return 0;
757}
758
759static int do_show_subset(int argc, char **argv)
760{
761 struct bpf_map_info info = {};
762 __u32 len = sizeof(info);
763 int *fds = NULL;
764 int nb_fds, i;
765 int err = -1;
766
767 fds = malloc(sizeof(int));
768 if (!fds) {
769 p_err("mem alloc failed");
770 return -1;
771 }
772 nb_fds = map_parse_fds(&argc, &argv, &fds);
773 if (nb_fds < 1)
774 goto exit_free;
775
776 if (json_output && nb_fds > 1)
777 jsonw_start_array(json_wtr);
778 for (i = 0; i < nb_fds; i++) {
779 err = bpf_obj_get_info_by_fd(fds[i], &info, &len);
780 if (err) {
781 p_err("can't get map info: %s",
782 strerror(errno));
783 for (; i < nb_fds; i++)
784 close(fds[i]);
785 break;
786 }
787
788 if (json_output)
789 show_map_close_json(fds[i], &info);
790 else
791 show_map_close_plain(fds[i], &info);
792
793 close(fds[i]);
794 }
795 if (json_output && nb_fds > 1)
796 jsonw_end_array(json_wtr);
797
798exit_free:
799 free(fds);
800 return err;
801}
802
803static int do_show(int argc, char **argv)
804{
805 struct bpf_map_info info = {};
806 __u32 len = sizeof(info);
807 __u32 id = 0;
808 int err;
809 int fd;
810
811 if (show_pinned)
812 build_pinned_obj_table(&map_table, BPF_OBJ_MAP);
813
814 if (argc == 2)
815 return do_show_subset(argc, argv);
816
817 if (argc)
818 return BAD_ARG();
819
820 if (json_output)
821 jsonw_start_array(json_wtr);
822 while (true) {
823 err = bpf_map_get_next_id(id, &id);
824 if (err) {
825 if (errno == ENOENT)
826 break;
827 p_err("can't get next map: %s%s", strerror(errno),
828 errno == EINVAL ? " -- kernel too old?" : "");
829 break;
830 }
831
832 fd = bpf_map_get_fd_by_id(id);
833 if (fd < 0) {
834 if (errno == ENOENT)
835 continue;
836 p_err("can't get map by id (%u): %s",
837 id, strerror(errno));
838 break;
839 }
840
841 err = bpf_obj_get_info_by_fd(fd, &info, &len);
842 if (err) {
843 p_err("can't get map info: %s", strerror(errno));
844 close(fd);
845 break;
846 }
847
848 if (json_output)
849 show_map_close_json(fd, &info);
850 else
851 show_map_close_plain(fd, &info);
852 }
853 if (json_output)
854 jsonw_end_array(json_wtr);
855
856 return errno == ENOENT ? 0 : -1;
857}
858
859static int dump_map_elem(int fd, void *key, void *value,
860 struct bpf_map_info *map_info, struct btf *btf,
861 json_writer_t *btf_wtr)
862{
863 int num_elems = 0;
864 int lookup_errno;
865
866 if (!bpf_map_lookup_elem(fd, key, value)) {
867 if (json_output) {
868 print_entry_json(map_info, key, value, btf);
869 } else {
870 if (btf) {
871 struct btf_dumper d = {
872 .btf = btf,
873 .jw = btf_wtr,
874 .is_plain_text = true,
875 };
876
877 do_dump_btf(&d, map_info, key, value);
878 } else {
879 print_entry_plain(map_info, key, value);
880 }
881 num_elems++;
882 }
883 return num_elems;
884 }
885
886
887 lookup_errno = errno;
888
889 if (map_is_map_of_maps(map_info->type) ||
890 map_is_map_of_progs(map_info->type))
891 return 0;
892
893 if (json_output) {
894 jsonw_start_object(json_wtr);
895 jsonw_name(json_wtr, "key");
896 print_hex_data_json(key, map_info->key_size);
897 jsonw_name(json_wtr, "value");
898 jsonw_start_object(json_wtr);
899 jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
900 jsonw_end_object(json_wtr);
901 jsonw_end_object(json_wtr);
902 } else {
903 const char *msg = NULL;
904
905 if (lookup_errno == ENOENT)
906 msg = "<no entry>";
907 else if (lookup_errno == ENOSPC &&
908 map_info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY)
909 msg = "<cannot read>";
910
911 print_entry_error(map_info, key,
912 msg ? : strerror(lookup_errno));
913 }
914
915 return 0;
916}
917
918static int maps_have_btf(int *fds, int nb_fds)
919{
920 struct bpf_map_info info = {};
921 __u32 len = sizeof(info);
922 int err, i;
923
924 for (i = 0; i < nb_fds; i++) {
925 err = bpf_obj_get_info_by_fd(fds[i], &info, &len);
926 if (err) {
927 p_err("can't get map info: %s", strerror(errno));
928 return -1;
929 }
930
931 if (!info.btf_id)
932 return 0;
933 }
934
935 return 1;
936}
937
938static struct btf *btf_vmlinux;
939
940static struct btf *get_map_kv_btf(const struct bpf_map_info *info)
941{
942 struct btf *btf = NULL;
943
944 if (info->btf_vmlinux_value_type_id) {
945 if (!btf_vmlinux) {
946 btf_vmlinux = libbpf_find_kernel_btf();
947 if (IS_ERR(btf_vmlinux))
948 p_err("failed to get kernel btf");
949 }
950 return btf_vmlinux;
951 } else if (info->btf_value_type_id) {
952 int err;
953
954 err = btf__get_from_id(info->btf_id, &btf);
955 if (err || !btf) {
956 p_err("failed to get btf");
957 btf = err ? ERR_PTR(err) : ERR_PTR(-ESRCH);
958 }
959 }
960
961 return btf;
962}
963
964static void free_map_kv_btf(struct btf *btf)
965{
966 if (!IS_ERR(btf) && btf != btf_vmlinux)
967 btf__free(btf);
968}
969
970static void free_btf_vmlinux(void)
971{
972 if (!IS_ERR(btf_vmlinux))
973 btf__free(btf_vmlinux);
974}
975
976static int
977map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr,
978 bool show_header)
979{
980 void *key, *value, *prev_key;
981 unsigned int num_elems = 0;
982 struct btf *btf = NULL;
983 int err;
984
985 key = malloc(info->key_size);
986 value = alloc_value(info);
987 if (!key || !value) {
988 p_err("mem alloc failed");
989 err = -1;
990 goto exit_free;
991 }
992
993 prev_key = NULL;
994
995 if (wtr) {
996 btf = get_map_kv_btf(info);
997 if (IS_ERR(btf)) {
998 err = PTR_ERR(btf);
999 goto exit_free;
1000 }
1001
1002 if (show_header) {
1003 jsonw_start_object(wtr);
1004 show_map_header_json(info, wtr);
1005 jsonw_name(wtr, "elements");
1006 }
1007 jsonw_start_array(wtr);
1008 } else if (show_header) {
1009 show_map_header_plain(info);
1010 }
1011
1012 if (info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY &&
1013 info->value_size != 8)
1014 p_info("Warning: cannot read values from %s map with value_size != 8",
1015 map_type_name[info->type]);
1016 while (true) {
1017 err = bpf_map_get_next_key(fd, prev_key, key);
1018 if (err) {
1019 if (errno == ENOENT)
1020 err = 0;
1021 break;
1022 }
1023 num_elems += dump_map_elem(fd, key, value, info, btf, wtr);
1024 prev_key = key;
1025 }
1026
1027 if (wtr) {
1028 jsonw_end_array(wtr);
1029 if (show_header)
1030 jsonw_end_object(wtr);
1031 } else {
1032 printf("Found %u element%s\n", num_elems,
1033 num_elems != 1 ? "s" : "");
1034 }
1035
1036exit_free:
1037 free(key);
1038 free(value);
1039 close(fd);
1040 free_map_kv_btf(btf);
1041
1042 return err;
1043}
1044
1045static int do_dump(int argc, char **argv)
1046{
1047 json_writer_t *wtr = NULL, *btf_wtr = NULL;
1048 struct bpf_map_info info = {};
1049 int nb_fds, i = 0;
1050 __u32 len = sizeof(info);
1051 int *fds = NULL;
1052 int err = -1;
1053
1054 if (argc != 2)
1055 usage();
1056
1057 fds = malloc(sizeof(int));
1058 if (!fds) {
1059 p_err("mem alloc failed");
1060 return -1;
1061 }
1062 nb_fds = map_parse_fds(&argc, &argv, &fds);
1063 if (nb_fds < 1)
1064 goto exit_free;
1065
1066 if (json_output) {
1067 wtr = json_wtr;
1068 } else {
1069 int do_plain_btf;
1070
1071 do_plain_btf = maps_have_btf(fds, nb_fds);
1072 if (do_plain_btf < 0)
1073 goto exit_close;
1074
1075 if (do_plain_btf) {
1076 btf_wtr = get_btf_writer();
1077 wtr = btf_wtr;
1078 if (!btf_wtr)
1079 p_info("failed to create json writer for btf. falling back to plain output");
1080 }
1081 }
1082
1083 if (wtr && nb_fds > 1)
1084 jsonw_start_array(wtr);
1085 for (i = 0; i < nb_fds; i++) {
1086 if (bpf_obj_get_info_by_fd(fds[i], &info, &len)) {
1087 p_err("can't get map info: %s", strerror(errno));
1088 break;
1089 }
1090 err = map_dump(fds[i], &info, wtr, nb_fds > 1);
1091 if (!wtr && i != nb_fds - 1)
1092 printf("\n");
1093
1094 if (err)
1095 break;
1096 close(fds[i]);
1097 }
1098 if (wtr && nb_fds > 1)
1099 jsonw_end_array(wtr);
1100
1101 if (btf_wtr)
1102 jsonw_destroy(&btf_wtr);
1103exit_close:
1104 for (; i < nb_fds; i++)
1105 close(fds[i]);
1106exit_free:
1107 free(fds);
1108 free_btf_vmlinux();
1109 return err;
1110}
1111
1112static int alloc_key_value(struct bpf_map_info *info, void **key, void **value)
1113{
1114 *key = NULL;
1115 *value = NULL;
1116
1117 if (info->key_size) {
1118 *key = malloc(info->key_size);
1119 if (!*key) {
1120 p_err("key mem alloc failed");
1121 return -1;
1122 }
1123 }
1124
1125 if (info->value_size) {
1126 *value = alloc_value(info);
1127 if (!*value) {
1128 p_err("value mem alloc failed");
1129 free(*key);
1130 *key = NULL;
1131 return -1;
1132 }
1133 }
1134
1135 return 0;
1136}
1137
1138static int do_update(int argc, char **argv)
1139{
1140 struct bpf_map_info info = {};
1141 __u32 len = sizeof(info);
1142 __u32 *value_fd = NULL;
1143 __u32 flags = BPF_ANY;
1144 void *key, *value;
1145 int fd, err;
1146
1147 if (argc < 2)
1148 usage();
1149
1150 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1151 if (fd < 0)
1152 return -1;
1153
1154 err = alloc_key_value(&info, &key, &value);
1155 if (err)
1156 goto exit_free;
1157
1158 err = parse_elem(argv, &info, key, value, info.key_size,
1159 info.value_size, &flags, &value_fd);
1160 if (err)
1161 goto exit_free;
1162
1163 err = bpf_map_update_elem(fd, key, value, flags);
1164 if (err) {
1165 p_err("update failed: %s", strerror(errno));
1166 goto exit_free;
1167 }
1168
1169exit_free:
1170 if (value_fd)
1171 close(*value_fd);
1172 free(key);
1173 free(value);
1174 close(fd);
1175
1176 if (!err && json_output)
1177 jsonw_null(json_wtr);
1178 return err;
1179}
1180
1181static void print_key_value(struct bpf_map_info *info, void *key,
1182 void *value)
1183{
1184 json_writer_t *btf_wtr;
1185 struct btf *btf = NULL;
1186 int err;
1187
1188 err = btf__get_from_id(info->btf_id, &btf);
1189 if (err) {
1190 p_err("failed to get btf");
1191 return;
1192 }
1193
1194 if (json_output) {
1195 print_entry_json(info, key, value, btf);
1196 } else if (btf) {
1197
1198
1199
1200 btf_wtr = get_btf_writer();
1201 if (!btf_wtr) {
1202 p_info("failed to create json writer for btf. falling back to plain output");
1203 btf__free(btf);
1204 btf = NULL;
1205 print_entry_plain(info, key, value);
1206 } else {
1207 struct btf_dumper d = {
1208 .btf = btf,
1209 .jw = btf_wtr,
1210 .is_plain_text = true,
1211 };
1212
1213 do_dump_btf(&d, info, key, value);
1214 jsonw_destroy(&btf_wtr);
1215 }
1216 } else {
1217 print_entry_plain(info, key, value);
1218 }
1219 btf__free(btf);
1220}
1221
1222static int do_lookup(int argc, char **argv)
1223{
1224 struct bpf_map_info info = {};
1225 __u32 len = sizeof(info);
1226 void *key, *value;
1227 int err;
1228 int fd;
1229
1230 if (argc < 2)
1231 usage();
1232
1233 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1234 if (fd < 0)
1235 return -1;
1236
1237 err = alloc_key_value(&info, &key, &value);
1238 if (err)
1239 goto exit_free;
1240
1241 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
1242 if (err)
1243 goto exit_free;
1244
1245 err = bpf_map_lookup_elem(fd, key, value);
1246 if (err) {
1247 if (errno == ENOENT) {
1248 if (json_output) {
1249 jsonw_null(json_wtr);
1250 } else {
1251 printf("key:\n");
1252 fprint_hex(stdout, key, info.key_size, " ");
1253 printf("\n\nNot found\n");
1254 }
1255 } else {
1256 p_err("lookup failed: %s", strerror(errno));
1257 }
1258
1259 goto exit_free;
1260 }
1261
1262
1263 print_key_value(&info, key, value);
1264
1265exit_free:
1266 free(key);
1267 free(value);
1268 close(fd);
1269
1270 return err;
1271}
1272
1273static int do_getnext(int argc, char **argv)
1274{
1275 struct bpf_map_info info = {};
1276 __u32 len = sizeof(info);
1277 void *key, *nextkey;
1278 int err;
1279 int fd;
1280
1281 if (argc < 2)
1282 usage();
1283
1284 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1285 if (fd < 0)
1286 return -1;
1287
1288 key = malloc(info.key_size);
1289 nextkey = malloc(info.key_size);
1290 if (!key || !nextkey) {
1291 p_err("mem alloc failed");
1292 err = -1;
1293 goto exit_free;
1294 }
1295
1296 if (argc) {
1297 err = parse_elem(argv, &info, key, NULL, info.key_size, 0,
1298 NULL, NULL);
1299 if (err)
1300 goto exit_free;
1301 } else {
1302 free(key);
1303 key = NULL;
1304 }
1305
1306 err = bpf_map_get_next_key(fd, key, nextkey);
1307 if (err) {
1308 p_err("can't get next key: %s", strerror(errno));
1309 goto exit_free;
1310 }
1311
1312 if (json_output) {
1313 jsonw_start_object(json_wtr);
1314 if (key) {
1315 jsonw_name(json_wtr, "key");
1316 print_hex_data_json(key, info.key_size);
1317 } else {
1318 jsonw_null_field(json_wtr, "key");
1319 }
1320 jsonw_name(json_wtr, "next_key");
1321 print_hex_data_json(nextkey, info.key_size);
1322 jsonw_end_object(json_wtr);
1323 } else {
1324 if (key) {
1325 printf("key:\n");
1326 fprint_hex(stdout, key, info.key_size, " ");
1327 printf("\n");
1328 } else {
1329 printf("key: None\n");
1330 }
1331 printf("next key:\n");
1332 fprint_hex(stdout, nextkey, info.key_size, " ");
1333 printf("\n");
1334 }
1335
1336exit_free:
1337 free(nextkey);
1338 free(key);
1339 close(fd);
1340
1341 return err;
1342}
1343
1344static int do_delete(int argc, char **argv)
1345{
1346 struct bpf_map_info info = {};
1347 __u32 len = sizeof(info);
1348 void *key;
1349 int err;
1350 int fd;
1351
1352 if (argc < 2)
1353 usage();
1354
1355 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1356 if (fd < 0)
1357 return -1;
1358
1359 key = malloc(info.key_size);
1360 if (!key) {
1361 p_err("mem alloc failed");
1362 err = -1;
1363 goto exit_free;
1364 }
1365
1366 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
1367 if (err)
1368 goto exit_free;
1369
1370 err = bpf_map_delete_elem(fd, key);
1371 if (err)
1372 p_err("delete failed: %s", strerror(errno));
1373
1374exit_free:
1375 free(key);
1376 close(fd);
1377
1378 if (!err && json_output)
1379 jsonw_null(json_wtr);
1380 return err;
1381}
1382
1383static int do_pin(int argc, char **argv)
1384{
1385 int err;
1386
1387 err = do_pin_any(argc, argv, map_parse_fd);
1388 if (!err && json_output)
1389 jsonw_null(json_wtr);
1390 return err;
1391}
1392
1393static int do_create(int argc, char **argv)
1394{
1395 struct bpf_create_map_attr attr = { NULL, };
1396 const char *pinfile;
1397 int err, fd;
1398
1399 if (!REQ_ARGS(7))
1400 return -1;
1401 pinfile = GET_ARG();
1402
1403 while (argc) {
1404 if (!REQ_ARGS(2))
1405 return -1;
1406
1407 if (is_prefix(*argv, "type")) {
1408 NEXT_ARG();
1409
1410 if (attr.map_type) {
1411 p_err("map type already specified");
1412 return -1;
1413 }
1414
1415 attr.map_type = map_type_from_str(*argv);
1416 if ((int)attr.map_type < 0) {
1417 p_err("unrecognized map type: %s", *argv);
1418 return -1;
1419 }
1420 NEXT_ARG();
1421 } else if (is_prefix(*argv, "name")) {
1422 NEXT_ARG();
1423 attr.name = GET_ARG();
1424 } else if (is_prefix(*argv, "key")) {
1425 if (parse_u32_arg(&argc, &argv, &attr.key_size,
1426 "key size"))
1427 return -1;
1428 } else if (is_prefix(*argv, "value")) {
1429 if (parse_u32_arg(&argc, &argv, &attr.value_size,
1430 "value size"))
1431 return -1;
1432 } else if (is_prefix(*argv, "entries")) {
1433 if (parse_u32_arg(&argc, &argv, &attr.max_entries,
1434 "max entries"))
1435 return -1;
1436 } else if (is_prefix(*argv, "flags")) {
1437 if (parse_u32_arg(&argc, &argv, &attr.map_flags,
1438 "flags"))
1439 return -1;
1440 } else if (is_prefix(*argv, "dev")) {
1441 NEXT_ARG();
1442
1443 if (attr.map_ifindex) {
1444 p_err("offload device already specified");
1445 return -1;
1446 }
1447
1448 attr.map_ifindex = if_nametoindex(*argv);
1449 if (!attr.map_ifindex) {
1450 p_err("unrecognized netdevice '%s': %s",
1451 *argv, strerror(errno));
1452 return -1;
1453 }
1454 NEXT_ARG();
1455 } else {
1456 p_err("unknown arg %s", *argv);
1457 return -1;
1458 }
1459 }
1460
1461 if (!attr.name) {
1462 p_err("map name not specified");
1463 return -1;
1464 }
1465
1466 set_max_rlimit();
1467
1468 fd = bpf_create_map_xattr(&attr);
1469 if (fd < 0) {
1470 p_err("map create failed: %s", strerror(errno));
1471 return -1;
1472 }
1473
1474 err = do_pin_fd(fd, pinfile);
1475 close(fd);
1476 if (err)
1477 return err;
1478
1479 if (json_output)
1480 jsonw_null(json_wtr);
1481 return 0;
1482}
1483
1484static int do_pop_dequeue(int argc, char **argv)
1485{
1486 struct bpf_map_info info = {};
1487 __u32 len = sizeof(info);
1488 void *key, *value;
1489 int err;
1490 int fd;
1491
1492 if (argc < 2)
1493 usage();
1494
1495 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1496 if (fd < 0)
1497 return -1;
1498
1499 err = alloc_key_value(&info, &key, &value);
1500 if (err)
1501 goto exit_free;
1502
1503 err = bpf_map_lookup_and_delete_elem(fd, key, value);
1504 if (err) {
1505 if (errno == ENOENT) {
1506 if (json_output)
1507 jsonw_null(json_wtr);
1508 else
1509 printf("Error: empty map\n");
1510 } else {
1511 p_err("pop failed: %s", strerror(errno));
1512 }
1513
1514 goto exit_free;
1515 }
1516
1517 print_key_value(&info, key, value);
1518
1519exit_free:
1520 free(key);
1521 free(value);
1522 close(fd);
1523
1524 return err;
1525}
1526
1527static int do_freeze(int argc, char **argv)
1528{
1529 int err, fd;
1530
1531 if (!REQ_ARGS(2))
1532 return -1;
1533
1534 fd = map_parse_fd(&argc, &argv);
1535 if (fd < 0)
1536 return -1;
1537
1538 if (argc) {
1539 close(fd);
1540 return BAD_ARG();
1541 }
1542
1543 err = bpf_map_freeze(fd);
1544 close(fd);
1545 if (err) {
1546 p_err("failed to freeze map: %s", strerror(errno));
1547 return err;
1548 }
1549
1550 if (json_output)
1551 jsonw_null(json_wtr);
1552
1553 return 0;
1554}
1555
1556static int do_help(int argc, char **argv)
1557{
1558 if (json_output) {
1559 jsonw_null(json_wtr);
1560 return 0;
1561 }
1562
1563 fprintf(stderr,
1564 "Usage: %s %s { show | list } [MAP]\n"
1565 " %s %s create FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
1566 " entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
1567 " [dev NAME]\n"
1568 " %s %s dump MAP\n"
1569 " %s %s update MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
1570 " %s %s lookup MAP [key DATA]\n"
1571 " %s %s getnext MAP [key DATA]\n"
1572 " %s %s delete MAP key DATA\n"
1573 " %s %s pin MAP FILE\n"
1574 " %s %s event_pipe MAP [cpu N index M]\n"
1575 " %s %s peek MAP\n"
1576 " %s %s push MAP value VALUE\n"
1577 " %s %s pop MAP\n"
1578 " %s %s enqueue MAP value VALUE\n"
1579 " %s %s dequeue MAP\n"
1580 " %s %s freeze MAP\n"
1581 " %s %s help\n"
1582 "\n"
1583 " " HELP_SPEC_MAP "\n"
1584 " DATA := { [hex] BYTES }\n"
1585 " " HELP_SPEC_PROGRAM "\n"
1586 " VALUE := { DATA | MAP | PROG }\n"
1587 " UPDATE_FLAGS := { any | exist | noexist }\n"
1588 " TYPE := { hash | array | prog_array | perf_event_array | percpu_hash |\n"
1589 " percpu_array | stack_trace | cgroup_array | lru_hash |\n"
1590 " lru_percpu_hash | lpm_trie | array_of_maps | hash_of_maps |\n"
1591 " devmap | devmap_hash | sockmap | cpumap | xskmap | sockhash |\n"
1592 " cgroup_storage | reuseport_sockarray | percpu_cgroup_storage }\n"
1593 " " HELP_SPEC_OPTIONS "\n"
1594 "",
1595 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1596 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1597 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1598 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1599 bin_name, argv[-2], bin_name, argv[-2], bin_name, argv[-2],
1600 bin_name, argv[-2]);
1601
1602 return 0;
1603}
1604
1605static const struct cmd cmds[] = {
1606 { "show", do_show },
1607 { "list", do_show },
1608 { "help", do_help },
1609 { "dump", do_dump },
1610 { "update", do_update },
1611 { "lookup", do_lookup },
1612 { "getnext", do_getnext },
1613 { "delete", do_delete },
1614 { "pin", do_pin },
1615 { "event_pipe", do_event_pipe },
1616 { "create", do_create },
1617 { "peek", do_lookup },
1618 { "push", do_update },
1619 { "enqueue", do_update },
1620 { "pop", do_pop_dequeue },
1621 { "dequeue", do_pop_dequeue },
1622 { "freeze", do_freeze },
1623 { 0 }
1624};
1625
1626int do_map(int argc, char **argv)
1627{
1628 return cmd_select(cmds, argc, argv, do_help);
1629}
1630
