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Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / tools / bpf / bpftool / map.c
blobb89bd792c1d510ab69b1c255639eba56a8722023
1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
3
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <linux/err.h>
7 #include <linux/kernel.h>
8 #include <net/if.h>
9 #include <stdbool.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <unistd.h>
14 #include <sys/types.h>
15 #include <sys/stat.h>
16
17 #include <bpf/bpf.h>
18 #include <bpf/btf.h>
19 #include <bpf/hashmap.h>
20
21 #include "json_writer.h"
22 #include "main.h"
23
24 static struct hashmap *map_table;
25
26 static bool map_is_per_cpu(__u32 type)
27 {
28 return type == BPF_MAP_TYPE_PERCPU_HASH ||
29 type == BPF_MAP_TYPE_PERCPU_ARRAY ||
30 type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
31 type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
32 }
33
34 static bool map_is_map_of_maps(__u32 type)
35 {
36 return type == BPF_MAP_TYPE_ARRAY_OF_MAPS ||
37 type == BPF_MAP_TYPE_HASH_OF_MAPS;
38 }
39
40 static bool map_is_map_of_progs(__u32 type)
41 {
42 return type == BPF_MAP_TYPE_PROG_ARRAY;
43 }
44
45 static int map_type_from_str(const char *type)
46 {
47 const char *map_type_str;
48 unsigned int i;
49
50 for (i = 0; ; i++) {
51 map_type_str = libbpf_bpf_map_type_str(i);
52 if (!map_type_str)
53 break;
54
55 /* Don't allow prefixing in case of possible future shadowing */
56 if (!strcmp(map_type_str, type))
57 return i;
58 }
59 return -1;
60 }
61
62 static void *alloc_value(struct bpf_map_info *info)
63 {
64 if (map_is_per_cpu(info->type))
65 return malloc(round_up(info->value_size, 8) *
66 get_possible_cpus());
67 else
68 return malloc(info->value_size);
69 }
70
71 static int do_dump_btf(const struct btf_dumper *d,
72 struct bpf_map_info *map_info, void *key,
73 void *value)
74 {
75 __u32 value_id;
76 int ret = 0;
77
78 /* start of key-value pair */
79 jsonw_start_object(d->jw);
80
81 if (map_info->btf_key_type_id) {
82 jsonw_name(d->jw, "key");
83
84 ret = btf_dumper_type(d, map_info->btf_key_type_id, key);
85 if (ret)
86 goto err_end_obj;
87 }
88
89 value_id = map_info->btf_vmlinux_value_type_id ?
90 : map_info->btf_value_type_id;
91
92 if (!map_is_per_cpu(map_info->type)) {
93 jsonw_name(d->jw, "value");
94 ret = btf_dumper_type(d, value_id, value);
95 } else {
96 unsigned int i, n, step;
97
98 jsonw_name(d->jw, "values");
99 jsonw_start_array(d->jw);
100 n = get_possible_cpus();
101 step = round_up(map_info->value_size, 8);
102 for (i = 0; i < n; i++) {
103 jsonw_start_object(d->jw);
104 jsonw_int_field(d->jw, "cpu", i);
105 jsonw_name(d->jw, "value");
106 ret = btf_dumper_type(d, value_id, value + i * step);
107 jsonw_end_object(d->jw);
108 if (ret)
109 break;
110 }
111 jsonw_end_array(d->jw);
112 }
113
114 err_end_obj:
115 /* end of key-value pair */
116 jsonw_end_object(d->jw);
117
118 return ret;
119 }
120
121 static json_writer_t *get_btf_writer(void)
122 {
123 json_writer_t *jw = jsonw_new(stdout);
124
125 if (!jw)
126 return NULL;
127 jsonw_pretty(jw, true);
128
129 return jw;
130 }
131
132 static void print_entry_json(struct bpf_map_info *info, unsigned char *key,
133 unsigned char *value, struct btf *btf)
134 {
135 jsonw_start_object(json_wtr);
136
137 if (!map_is_per_cpu(info->type)) {
138 jsonw_name(json_wtr, "key");
139 print_hex_data_json(key, info->key_size);
140 jsonw_name(json_wtr, "value");
141 print_hex_data_json(value, info->value_size);
142 if (map_is_map_of_maps(info->type))
143 jsonw_uint_field(json_wtr, "inner_map_id",
144 *(unsigned int *)value);
145 if (btf) {
146 struct btf_dumper d = {
147 .btf = btf,
148 .jw = json_wtr,
149 .is_plain_text = false,
150 };
151
152 jsonw_name(json_wtr, "formatted");
153 do_dump_btf(&d, info, key, value);
154 }
155 } else {
156 unsigned int i, n, step;
157
158 n = get_possible_cpus();
159 step = round_up(info->value_size, 8);
160
161 jsonw_name(json_wtr, "key");
162 print_hex_data_json(key, info->key_size);
163
164 jsonw_name(json_wtr, "values");
165 jsonw_start_array(json_wtr);
166 for (i = 0; i < n; i++) {
167 jsonw_start_object(json_wtr);
168
169 jsonw_int_field(json_wtr, "cpu", i);
170
171 jsonw_name(json_wtr, "value");
172 print_hex_data_json(value + i * step,
173 info->value_size);
174
175 jsonw_end_object(json_wtr);
176 }
177 jsonw_end_array(json_wtr);
178 if (btf) {
179 struct btf_dumper d = {
180 .btf = btf,
181 .jw = json_wtr,
182 .is_plain_text = false,
183 };
184
185 jsonw_name(json_wtr, "formatted");
186 do_dump_btf(&d, info, key, value);
187 }
188 }
189
190 jsonw_end_object(json_wtr);
191 }
192
193 static void
194 print_entry_error_msg(struct bpf_map_info *info, unsigned char *key,
195 const char *error_msg)
196 {
197 int msg_size = strlen(error_msg);
198 bool single_line, break_names;
199
200 break_names = info->key_size > 16 || msg_size > 16;
201 single_line = info->key_size + msg_size <= 24 && !break_names;
202
203 printf("key:%c", break_names ? '\n' : ' ');
204 fprint_hex(stdout, key, info->key_size, " ");
205
206 printf(single_line ? " " : "\n");
207
208 printf("value:%c%s", break_names ? '\n' : ' ', error_msg);
209
210 printf("\n");
211 }
212
213 static void
214 print_entry_error(struct bpf_map_info *map_info, void *key, int lookup_errno)
215 {
216 /* For prog_array maps or arrays of maps, failure to lookup the value
217 * means there is no entry for that key. Do not print an error message
218 * in that case.
219 */
220 if ((map_is_map_of_maps(map_info->type) ||
221 map_is_map_of_progs(map_info->type)) && lookup_errno == ENOENT)
222 return;
223
224 if (json_output) {
225 jsonw_start_object(json_wtr); /* entry */
226 jsonw_name(json_wtr, "key");
227 print_hex_data_json(key, map_info->key_size);
228 jsonw_name(json_wtr, "value");
229 jsonw_start_object(json_wtr); /* error */
230 jsonw_string_field(json_wtr, "error", strerror(lookup_errno));
231 jsonw_end_object(json_wtr); /* error */
232 jsonw_end_object(json_wtr); /* entry */
233 } else {
234 const char *msg = NULL;
235
236 if (lookup_errno == ENOENT)
237 msg = "<no entry>";
238 else if (lookup_errno == ENOSPC &&
239 map_info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY)
240 msg = "<cannot read>";
241
242 print_entry_error_msg(map_info, key,
243 msg ? : strerror(lookup_errno));
244 }
245 }
246
247 static void print_entry_plain(struct bpf_map_info *info, unsigned char *key,
248 unsigned char *value)
249 {
250 if (!map_is_per_cpu(info->type)) {
251 bool single_line, break_names;
252
253 break_names = info->key_size > 16 || info->value_size > 16;
254 single_line = info->key_size + info->value_size <= 24 &&
255 !break_names;
256
257 if (info->key_size) {
258 printf("key:%c", break_names ? '\n' : ' ');
259 fprint_hex(stdout, key, info->key_size, " ");
260
261 printf(single_line ? " " : "\n");
262 }
263
264 if (info->value_size) {
265 if (map_is_map_of_maps(info->type)) {
266 printf("inner_map_id:%c", break_names ? '\n' : ' ');
267 printf("%u ", *(unsigned int *)value);
268 } else {
269 printf("value:%c", break_names ? '\n' : ' ');
270 fprint_hex(stdout, value, info->value_size, " ");
271 }
272 }
273
274 printf("\n");
275 } else {
276 unsigned int i, n, step;
277
278 n = get_possible_cpus();
279 step = round_up(info->value_size, 8);
280
281 if (info->key_size) {
282 printf("key:\n");
283 fprint_hex(stdout, key, info->key_size, " ");
284 printf("\n");
285 }
286 if (info->value_size) {
287 for (i = 0; i < n; i++) {
288 printf("value (CPU %02d):%c",
289 i, info->value_size > 16 ? '\n' : ' ');
290 fprint_hex(stdout, value + i * step,
291 info->value_size, " ");
292 printf("\n");
293 }
294 }
295 }
296 }
297
298 static char **parse_bytes(char **argv, const char *name, unsigned char *val,
299 unsigned int n)
300 {
301 unsigned int i = 0, base = 0;
302 char *endptr;
303
304 if (is_prefix(*argv, "hex")) {
305 base = 16;
306 argv++;
307 }
308
309 while (i < n && argv[i]) {
310 val[i] = strtoul(argv[i], &endptr, base);
311 if (*endptr) {
312 p_err("error parsing byte: %s", argv[i]);
313 return NULL;
314 }
315 i++;
316 }
317
318 if (i != n) {
319 p_err("%s expected %d bytes got %d", name, n, i);
320 return NULL;
321 }
322
323 return argv + i;
324 }
325
326 /* on per cpu maps we must copy the provided value on all value instances */
327 static void fill_per_cpu_value(struct bpf_map_info *info, void *value)
328 {
329 unsigned int i, n, step;
330
331 if (!map_is_per_cpu(info->type))
332 return;
333
334 n = get_possible_cpus();
335 step = round_up(info->value_size, 8);
336 for (i = 1; i < n; i++)
337 memcpy(value + i * step, value, info->value_size);
338 }
339
340 static int parse_elem(char **argv, struct bpf_map_info *info,
341 void *key, void *value, __u32 key_size, __u32 value_size,
342 __u32 *flags, __u32 **value_fd)
343 {
344 if (!*argv) {
345 if (!key && !value)
346 return 0;
347 p_err("did not find %s", key ? "key" : "value");
348 return -1;
349 }
350
351 if (is_prefix(*argv, "key")) {
352 if (!key) {
353 if (key_size)
354 p_err("duplicate key");
355 else
356 p_err("unnecessary key");
357 return -1;
358 }
359
360 argv = parse_bytes(argv + 1, "key", key, key_size);
361 if (!argv)
362 return -1;
363
364 return parse_elem(argv, info, NULL, value, key_size, value_size,
365 flags, value_fd);
366 } else if (is_prefix(*argv, "value")) {
367 int fd;
368
369 if (!value) {
370 if (value_size)
371 p_err("duplicate value");
372 else
373 p_err("unnecessary value");
374 return -1;
375 }
376
377 argv++;
378
379 if (map_is_map_of_maps(info->type)) {
380 int argc = 2;
381
382 if (value_size != 4) {
383 p_err("value smaller than 4B for map in map?");
384 return -1;
385 }
386 if (!argv[0] || !argv[1]) {
387 p_err("not enough value arguments for map in map");
388 return -1;
389 }
390
391 fd = map_parse_fd(&argc, &argv);
392 if (fd < 0)
393 return -1;
394
395 *value_fd = value;
396 **value_fd = fd;
397 } else if (map_is_map_of_progs(info->type)) {
398 int argc = 2;
399
400 if (value_size != 4) {
401 p_err("value smaller than 4B for map of progs?");
402 return -1;
403 }
404 if (!argv[0] || !argv[1]) {
405 p_err("not enough value arguments for map of progs");
406 return -1;
407 }
408 if (is_prefix(*argv, "id"))
409 p_info("Warning: updating program array via MAP_ID, make sure this map is kept open\n"
410 " by some process or pinned otherwise update will be lost");
411
412 fd = prog_parse_fd(&argc, &argv);
413 if (fd < 0)
414 return -1;
415
416 *value_fd = value;
417 **value_fd = fd;
418 } else {
419 argv = parse_bytes(argv, "value", value, value_size);
420 if (!argv)
421 return -1;
422
423 fill_per_cpu_value(info, value);
424 }
425
426 return parse_elem(argv, info, key, NULL, key_size, value_size,
427 flags, NULL);
428 } else if (is_prefix(*argv, "any") || is_prefix(*argv, "noexist") ||
429 is_prefix(*argv, "exist")) {
430 if (!flags) {
431 p_err("flags specified multiple times: %s", *argv);
432 return -1;
433 }
434
435 if (is_prefix(*argv, "any"))
436 *flags = BPF_ANY;
437 else if (is_prefix(*argv, "noexist"))
438 *flags = BPF_NOEXIST;
439 else if (is_prefix(*argv, "exist"))
440 *flags = BPF_EXIST;
441
442 return parse_elem(argv + 1, info, key, value, key_size,
443 value_size, NULL, value_fd);
444 }
445
446 p_err("expected key or value, got: %s", *argv);
447 return -1;
448 }
449
450 static void show_map_header_json(struct bpf_map_info *info, json_writer_t *wtr)
451 {
452 const char *map_type_str;
453
454 jsonw_uint_field(wtr, "id", info->id);
455 map_type_str = libbpf_bpf_map_type_str(info->type);
456 if (map_type_str)
457 jsonw_string_field(wtr, "type", map_type_str);
458 else
459 jsonw_uint_field(wtr, "type", info->type);
460
461 if (*info->name)
462 jsonw_string_field(wtr, "name", info->name);
463
464 jsonw_name(wtr, "flags");
465 jsonw_printf(wtr, "%d", info->map_flags);
466 }
467
468 static int show_map_close_json(int fd, struct bpf_map_info *info)
469 {
470 char *memlock, *frozen_str;
471 int frozen = 0;
472
473 memlock = get_fdinfo(fd, "memlock");
474 frozen_str = get_fdinfo(fd, "frozen");
475
476 jsonw_start_object(json_wtr);
477
478 show_map_header_json(info, json_wtr);
479
480 print_dev_json(info->ifindex, info->netns_dev, info->netns_ino);
481
482 jsonw_uint_field(json_wtr, "bytes_key", info->key_size);
483 jsonw_uint_field(json_wtr, "bytes_value", info->value_size);
484 jsonw_uint_field(json_wtr, "max_entries", info->max_entries);
485
486 if (memlock)
487 jsonw_int_field(json_wtr, "bytes_memlock", atoll(memlock));
488 free(memlock);
489
490 if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
491 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
492 char *owner_jited = get_fdinfo(fd, "owner_jited");
493
494 if (owner_prog_type) {
495 unsigned int prog_type = atoi(owner_prog_type);
496 const char *prog_type_str;
497
498 prog_type_str = libbpf_bpf_prog_type_str(prog_type);
499 if (prog_type_str)
500 jsonw_string_field(json_wtr, "owner_prog_type",
501 prog_type_str);
502 else
503 jsonw_uint_field(json_wtr, "owner_prog_type",
504 prog_type);
505 }
506 if (owner_jited)
507 jsonw_bool_field(json_wtr, "owner_jited",
508 !!atoi(owner_jited));
509
510 free(owner_prog_type);
511 free(owner_jited);
512 }
513 close(fd);
514
515 if (frozen_str) {
516 frozen = atoi(frozen_str);
517 free(frozen_str);
518 }
519 jsonw_int_field(json_wtr, "frozen", frozen);
520
521 if (info->btf_id)
522 jsonw_int_field(json_wtr, "btf_id", info->btf_id);
523
524 if (!hashmap__empty(map_table)) {
525 struct hashmap_entry *entry;
526
527 jsonw_name(json_wtr, "pinned");
528 jsonw_start_array(json_wtr);
529 hashmap__for_each_key_entry(map_table, entry, info->id)
530 jsonw_string(json_wtr, entry->pvalue);
531 jsonw_end_array(json_wtr);
532 }
533
534 emit_obj_refs_json(refs_table, info->id, json_wtr);
535
536 jsonw_end_object(json_wtr);
537
538 return 0;
539 }
540
541 static void show_map_header_plain(struct bpf_map_info *info)
542 {
543 const char *map_type_str;
544
545 printf("%u: ", info->id);
546
547 map_type_str = libbpf_bpf_map_type_str(info->type);
548 if (map_type_str)
549 printf("%s ", map_type_str);
550 else
551 printf("type %u ", info->type);
552
553 if (*info->name)
554 printf("name %s ", info->name);
555
556 printf("flags 0x%x", info->map_flags);
557 print_dev_plain(info->ifindex, info->netns_dev, info->netns_ino);
558 printf("\n");
559 }
560
561 static int show_map_close_plain(int fd, struct bpf_map_info *info)
562 {
563 char *memlock, *frozen_str;
564 int frozen = 0;
565
566 memlock = get_fdinfo(fd, "memlock");
567 frozen_str = get_fdinfo(fd, "frozen");
568
569 show_map_header_plain(info);
570 printf("\tkey %uB value %uB max_entries %u",
571 info->key_size, info->value_size, info->max_entries);
572
573 if (memlock)
574 printf(" memlock %sB", memlock);
575 free(memlock);
576
577 if (info->type == BPF_MAP_TYPE_PROG_ARRAY) {
578 char *owner_prog_type = get_fdinfo(fd, "owner_prog_type");
579 char *owner_jited = get_fdinfo(fd, "owner_jited");
580
581 if (owner_prog_type || owner_jited)
582 printf("\n\t");
583 if (owner_prog_type) {
584 unsigned int prog_type = atoi(owner_prog_type);
585 const char *prog_type_str;
586
587 prog_type_str = libbpf_bpf_prog_type_str(prog_type);
588 if (prog_type_str)
589 printf("owner_prog_type %s ", prog_type_str);
590 else
591 printf("owner_prog_type %d ", prog_type);
592 }
593 if (owner_jited)
594 printf("owner%s jited",
595 atoi(owner_jited) ? "" : " not");
596
597 free(owner_prog_type);
598 free(owner_jited);
599 }
600 close(fd);
601
602 if (!hashmap__empty(map_table)) {
603 struct hashmap_entry *entry;
604
605 hashmap__for_each_key_entry(map_table, entry, info->id)
606 printf("\n\tpinned %s", (char *)entry->pvalue);
607 }
608
609 if (frozen_str) {
610 frozen = atoi(frozen_str);
611 free(frozen_str);
612 }
613
614 if (info->btf_id || frozen)
615 printf("\n\t");
616
617 if (info->btf_id)
618 printf("btf_id %d", info->btf_id);
619
620 if (frozen)
621 printf("%sfrozen", info->btf_id ? " " : "");
622
623 emit_obj_refs_plain(refs_table, info->id, "\n\tpids ");
624
625 printf("\n");
626 return 0;
627 }
628
629 static int do_show_subset(int argc, char **argv)
630 {
631 struct bpf_map_info info = {};
632 __u32 len = sizeof(info);
633 int *fds = NULL;
634 int nb_fds, i;
635 int err = -1;
636
637 fds = malloc(sizeof(int));
638 if (!fds) {
639 p_err("mem alloc failed");
640 return -1;
641 }
642 nb_fds = map_parse_fds(&argc, &argv, &fds);
643 if (nb_fds < 1)
644 goto exit_free;
645
646 if (json_output && nb_fds > 1)
647 jsonw_start_array(json_wtr); /* root array */
648 for (i = 0; i < nb_fds; i++) {
649 err = bpf_map_get_info_by_fd(fds[i], &info, &len);
650 if (err) {
651 p_err("can't get map info: %s",
652 strerror(errno));
653 for (; i < nb_fds; i++)
654 close(fds[i]);
655 break;
656 }
657
658 if (json_output)
659 show_map_close_json(fds[i], &info);
660 else
661 show_map_close_plain(fds[i], &info);
662
663 close(fds[i]);
664 }
665 if (json_output && nb_fds > 1)
666 jsonw_end_array(json_wtr); /* root array */
667
668 exit_free:
669 free(fds);
670 return err;
671 }
672
673 static int do_show(int argc, char **argv)
674 {
675 struct bpf_map_info info = {};
676 __u32 len = sizeof(info);
677 __u32 id = 0;
678 int err;
679 int fd;
680
681 if (show_pinned) {
682 map_table = hashmap__new(hash_fn_for_key_as_id,
683 equal_fn_for_key_as_id, NULL);
684 if (IS_ERR(map_table)) {
685 p_err("failed to create hashmap for pinned paths");
686 return -1;
687 }
688 build_pinned_obj_table(map_table, BPF_OBJ_MAP);
689 }
690 build_obj_refs_table(&refs_table, BPF_OBJ_MAP);
691
692 if (argc == 2)
693 return do_show_subset(argc, argv);
694
695 if (argc)
696 return BAD_ARG();
697
698 if (json_output)
699 jsonw_start_array(json_wtr);
700 while (true) {
701 err = bpf_map_get_next_id(id, &id);
702 if (err) {
703 if (errno == ENOENT)
704 break;
705 p_err("can't get next map: %s%s", strerror(errno),
706 errno == EINVAL ? " -- kernel too old?" : "");
707 break;
708 }
709
710 fd = bpf_map_get_fd_by_id(id);
711 if (fd < 0) {
712 if (errno == ENOENT)
713 continue;
714 p_err("can't get map by id (%u): %s",
715 id, strerror(errno));
716 break;
717 }
718
719 err = bpf_map_get_info_by_fd(fd, &info, &len);
720 if (err) {
721 p_err("can't get map info: %s", strerror(errno));
722 close(fd);
723 break;
724 }
725
726 if (json_output)
727 show_map_close_json(fd, &info);
728 else
729 show_map_close_plain(fd, &info);
730 }
731 if (json_output)
732 jsonw_end_array(json_wtr);
733
734 delete_obj_refs_table(refs_table);
735
736 if (show_pinned)
737 delete_pinned_obj_table(map_table);
738
739 return errno == ENOENT ? 0 : -1;
740 }
741
742 static int dump_map_elem(int fd, void *key, void *value,
743 struct bpf_map_info *map_info, struct btf *btf,
744 json_writer_t *btf_wtr)
745 {
746 if (bpf_map_lookup_elem(fd, key, value)) {
747 print_entry_error(map_info, key, errno);
748 return -1;
749 }
750
751 if (json_output) {
752 print_entry_json(map_info, key, value, btf);
753 } else if (btf) {
754 struct btf_dumper d = {
755 .btf = btf,
756 .jw = btf_wtr,
757 .is_plain_text = true,
758 };
759
760 do_dump_btf(&d, map_info, key, value);
761 } else {
762 print_entry_plain(map_info, key, value);
763 }
764
765 return 0;
766 }
767
768 static int maps_have_btf(int *fds, int nb_fds)
769 {
770 struct bpf_map_info info = {};
771 __u32 len = sizeof(info);
772 int err, i;
773
774 for (i = 0; i < nb_fds; i++) {
775 err = bpf_map_get_info_by_fd(fds[i], &info, &len);
776 if (err) {
777 p_err("can't get map info: %s", strerror(errno));
778 return -1;
779 }
780
781 if (!info.btf_id)
782 return 0;
783 }
784
785 return 1;
786 }
787
788 static struct btf *btf_vmlinux;
789
790 static int get_map_kv_btf(const struct bpf_map_info *info, struct btf **btf)
791 {
792 int err = 0;
793
794 if (info->btf_vmlinux_value_type_id) {
795 if (!btf_vmlinux) {
796 btf_vmlinux = libbpf_find_kernel_btf();
797 if (!btf_vmlinux) {
798 p_err("failed to get kernel btf");
799 return -errno;
800 }
801 }
802 *btf = btf_vmlinux;
803 } else if (info->btf_value_type_id) {
804 *btf = btf__load_from_kernel_by_id(info->btf_id);
805 if (!*btf) {
806 err = -errno;
807 p_err("failed to get btf");
808 }
809 } else {
810 *btf = NULL;
811 }
812
813 return err;
814 }
815
816 static void free_map_kv_btf(struct btf *btf)
817 {
818 if (btf != btf_vmlinux)
819 btf__free(btf);
820 }
821
822 static int
823 map_dump(int fd, struct bpf_map_info *info, json_writer_t *wtr,
824 bool show_header)
825 {
826 void *key, *value, *prev_key;
827 unsigned int num_elems = 0;
828 struct btf *btf = NULL;
829 int err;
830
831 key = malloc(info->key_size);
832 value = alloc_value(info);
833 if (!key || !value) {
834 p_err("mem alloc failed");
835 err = -1;
836 goto exit_free;
837 }
838
839 prev_key = NULL;
840
841 if (wtr) {
842 err = get_map_kv_btf(info, &btf);
843 if (err) {
844 goto exit_free;
845 }
846
847 if (show_header) {
848 jsonw_start_object(wtr); /* map object */
849 show_map_header_json(info, wtr);
850 jsonw_name(wtr, "elements");
851 }
852 jsonw_start_array(wtr); /* elements */
853 } else if (show_header) {
854 show_map_header_plain(info);
855 }
856
857 if (info->type == BPF_MAP_TYPE_REUSEPORT_SOCKARRAY &&
858 info->value_size != 8) {
859 const char *map_type_str;
860
861 map_type_str = libbpf_bpf_map_type_str(info->type);
862 p_info("Warning: cannot read values from %s map with value_size != 8",
863 map_type_str);
864 }
865 while (true) {
866 err = bpf_map_get_next_key(fd, prev_key, key);
867 if (err) {
868 if (errno == ENOENT)
869 err = 0;
870 break;
871 }
872 if (!dump_map_elem(fd, key, value, info, btf, wtr))
873 num_elems++;
874 prev_key = key;
875 }
876
877 if (wtr) {
878 jsonw_end_array(wtr); /* elements */
879 if (show_header)
880 jsonw_end_object(wtr); /* map object */
881 } else {
882 printf("Found %u element%s\n", num_elems,
883 num_elems != 1 ? "s" : "");
884 }
885
886 exit_free:
887 free(key);
888 free(value);
889 close(fd);
890 free_map_kv_btf(btf);
891
892 return err;
893 }
894
895 static int do_dump(int argc, char **argv)
896 {
897 json_writer_t *wtr = NULL, *btf_wtr = NULL;
898 struct bpf_map_info info = {};
899 int nb_fds, i = 0;
900 __u32 len = sizeof(info);
901 int *fds = NULL;
902 int err = -1;
903
904 if (argc != 2)
905 usage();
906
907 fds = malloc(sizeof(int));
908 if (!fds) {
909 p_err("mem alloc failed");
910 return -1;
911 }
912 nb_fds = map_parse_fds(&argc, &argv, &fds);
913 if (nb_fds < 1)
914 goto exit_free;
915
916 if (json_output) {
917 wtr = json_wtr;
918 } else {
919 int do_plain_btf;
920
921 do_plain_btf = maps_have_btf(fds, nb_fds);
922 if (do_plain_btf < 0)
923 goto exit_close;
924
925 if (do_plain_btf) {
926 btf_wtr = get_btf_writer();
927 wtr = btf_wtr;
928 if (!btf_wtr)
929 p_info("failed to create json writer for btf. falling back to plain output");
930 }
931 }
932
933 if (wtr && nb_fds > 1)
934 jsonw_start_array(wtr); /* root array */
935 for (i = 0; i < nb_fds; i++) {
936 if (bpf_map_get_info_by_fd(fds[i], &info, &len)) {
937 p_err("can't get map info: %s", strerror(errno));
938 break;
939 }
940 err = map_dump(fds[i], &info, wtr, nb_fds > 1);
941 if (!wtr && i != nb_fds - 1)
942 printf("\n");
943
944 if (err)
945 break;
946 close(fds[i]);
947 }
948 if (wtr && nb_fds > 1)
949 jsonw_end_array(wtr); /* root array */
950
951 if (btf_wtr)
952 jsonw_destroy(&btf_wtr);
953 exit_close:
954 for (; i < nb_fds; i++)
955 close(fds[i]);
956 exit_free:
957 free(fds);
958 btf__free(btf_vmlinux);
959 return err;
960 }
961
962 static int alloc_key_value(struct bpf_map_info *info, void **key, void **value)
963 {
964 *key = NULL;
965 *value = NULL;
966
967 if (info->key_size) {
968 *key = malloc(info->key_size);
969 if (!*key) {
970 p_err("key mem alloc failed");
971 return -1;
972 }
973 }
974
975 if (info->value_size) {
976 *value = alloc_value(info);
977 if (!*value) {
978 p_err("value mem alloc failed");
979 free(*key);
980 *key = NULL;
981 return -1;
982 }
983 }
984
985 return 0;
986 }
987
988 static int do_update(int argc, char **argv)
989 {
990 struct bpf_map_info info = {};
991 __u32 len = sizeof(info);
992 __u32 *value_fd = NULL;
993 __u32 flags = BPF_ANY;
994 void *key, *value;
995 int fd, err;
996
997 if (argc < 2)
998 usage();
999
1000 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1001 if (fd < 0)
1002 return -1;
1003
1004 err = alloc_key_value(&info, &key, &value);
1005 if (err)
1006 goto exit_free;
1007
1008 err = parse_elem(argv, &info, key, value, info.key_size,
1009 info.value_size, &flags, &value_fd);
1010 if (err)
1011 goto exit_free;
1012
1013 err = bpf_map_update_elem(fd, key, value, flags);
1014 if (err) {
1015 p_err("update failed: %s", strerror(errno));
1016 goto exit_free;
1017 }
1018
1019 exit_free:
1020 if (value_fd)
1021 close(*value_fd);
1022 free(key);
1023 free(value);
1024 close(fd);
1025
1026 if (!err && json_output)
1027 jsonw_null(json_wtr);
1028 return err;
1029 }
1030
1031 static void print_key_value(struct bpf_map_info *info, void *key,
1032 void *value)
1033 {
1034 json_writer_t *btf_wtr;
1035 struct btf *btf;
1036
1037 if (get_map_kv_btf(info, &btf))
1038 return;
1039
1040 if (json_output) {
1041 print_entry_json(info, key, value, btf);
1042 } else if (btf) {
1043 /* if here json_wtr wouldn't have been initialised,
1044 * so let's create separate writer for btf
1045 */
1046 btf_wtr = get_btf_writer();
1047 if (!btf_wtr) {
1048 p_info("failed to create json writer for btf. falling back to plain output");
1049 btf__free(btf);
1050 btf = NULL;
1051 print_entry_plain(info, key, value);
1052 } else {
1053 struct btf_dumper d = {
1054 .btf = btf,
1055 .jw = btf_wtr,
1056 .is_plain_text = true,
1057 };
1058
1059 do_dump_btf(&d, info, key, value);
1060 jsonw_destroy(&btf_wtr);
1061 }
1062 } else {
1063 print_entry_plain(info, key, value);
1064 }
1065 btf__free(btf);
1066 }
1067
1068 static int do_lookup(int argc, char **argv)
1069 {
1070 struct bpf_map_info info = {};
1071 __u32 len = sizeof(info);
1072 void *key, *value;
1073 int err;
1074 int fd;
1075
1076 if (argc < 2)
1077 usage();
1078
1079 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1080 if (fd < 0)
1081 return -1;
1082
1083 err = alloc_key_value(&info, &key, &value);
1084 if (err)
1085 goto exit_free;
1086
1087 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
1088 if (err)
1089 goto exit_free;
1090
1091 err = bpf_map_lookup_elem(fd, key, value);
1092 if (err) {
1093 if (errno == ENOENT) {
1094 if (json_output) {
1095 jsonw_null(json_wtr);
1096 } else {
1097 printf("key:\n");
1098 fprint_hex(stdout, key, info.key_size, " ");
1099 printf("\n\nNot found\n");
1100 }
1101 } else {
1102 p_err("lookup failed: %s", strerror(errno));
1103 }
1104
1105 goto exit_free;
1106 }
1107
1108 /* here means bpf_map_lookup_elem() succeeded */
1109 print_key_value(&info, key, value);
1110
1111 exit_free:
1112 free(key);
1113 free(value);
1114 close(fd);
1115
1116 return err;
1117 }
1118
1119 static int do_getnext(int argc, char **argv)
1120 {
1121 struct bpf_map_info info = {};
1122 __u32 len = sizeof(info);
1123 void *key, *nextkey;
1124 int err;
1125 int fd;
1126
1127 if (argc < 2)
1128 usage();
1129
1130 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1131 if (fd < 0)
1132 return -1;
1133
1134 key = malloc(info.key_size);
1135 nextkey = malloc(info.key_size);
1136 if (!key || !nextkey) {
1137 p_err("mem alloc failed");
1138 err = -1;
1139 goto exit_free;
1140 }
1141
1142 if (argc) {
1143 err = parse_elem(argv, &info, key, NULL, info.key_size, 0,
1144 NULL, NULL);
1145 if (err)
1146 goto exit_free;
1147 } else {
1148 free(key);
1149 key = NULL;
1150 }
1151
1152 err = bpf_map_get_next_key(fd, key, nextkey);
1153 if (err) {
1154 p_err("can't get next key: %s", strerror(errno));
1155 goto exit_free;
1156 }
1157
1158 if (json_output) {
1159 jsonw_start_object(json_wtr);
1160 if (key) {
1161 jsonw_name(json_wtr, "key");
1162 print_hex_data_json(key, info.key_size);
1163 } else {
1164 jsonw_null_field(json_wtr, "key");
1165 }
1166 jsonw_name(json_wtr, "next_key");
1167 print_hex_data_json(nextkey, info.key_size);
1168 jsonw_end_object(json_wtr);
1169 } else {
1170 if (key) {
1171 printf("key:\n");
1172 fprint_hex(stdout, key, info.key_size, " ");
1173 printf("\n");
1174 } else {
1175 printf("key: None\n");
1176 }
1177 printf("next key:\n");
1178 fprint_hex(stdout, nextkey, info.key_size, " ");
1179 printf("\n");
1180 }
1181
1182 exit_free:
1183 free(nextkey);
1184 free(key);
1185 close(fd);
1186
1187 return err;
1188 }
1189
1190 static int do_delete(int argc, char **argv)
1191 {
1192 struct bpf_map_info info = {};
1193 __u32 len = sizeof(info);
1194 void *key;
1195 int err;
1196 int fd;
1197
1198 if (argc < 2)
1199 usage();
1200
1201 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1202 if (fd < 0)
1203 return -1;
1204
1205 key = malloc(info.key_size);
1206 if (!key) {
1207 p_err("mem alloc failed");
1208 err = -1;
1209 goto exit_free;
1210 }
1211
1212 err = parse_elem(argv, &info, key, NULL, info.key_size, 0, NULL, NULL);
1213 if (err)
1214 goto exit_free;
1215
1216 err = bpf_map_delete_elem(fd, key);
1217 if (err)
1218 p_err("delete failed: %s", strerror(errno));
1219
1220 exit_free:
1221 free(key);
1222 close(fd);
1223
1224 if (!err && json_output)
1225 jsonw_null(json_wtr);
1226 return err;
1227 }
1228
1229 static int do_pin(int argc, char **argv)
1230 {
1231 int err;
1232
1233 err = do_pin_any(argc, argv, map_parse_fd);
1234 if (!err && json_output)
1235 jsonw_null(json_wtr);
1236 return err;
1237 }
1238
1239 static int do_create(int argc, char **argv)
1240 {
1241 LIBBPF_OPTS(bpf_map_create_opts, attr);
1242 enum bpf_map_type map_type = BPF_MAP_TYPE_UNSPEC;
1243 __u32 key_size = 0, value_size = 0, max_entries = 0;
1244 const char *map_name = NULL;
1245 const char *pinfile;
1246 int err = -1, fd;
1247
1248 if (!REQ_ARGS(7))
1249 return -1;
1250 pinfile = GET_ARG();
1251
1252 while (argc) {
1253 if (!REQ_ARGS(2))
1254 return -1;
1255
1256 if (is_prefix(*argv, "type")) {
1257 NEXT_ARG();
1258
1259 if (map_type) {
1260 p_err("map type already specified");
1261 goto exit;
1262 }
1263
1264 map_type = map_type_from_str(*argv);
1265 if ((int)map_type < 0) {
1266 p_err("unrecognized map type: %s", *argv);
1267 goto exit;
1268 }
1269 NEXT_ARG();
1270 } else if (is_prefix(*argv, "name")) {
1271 NEXT_ARG();
1272 map_name = GET_ARG();
1273 } else if (is_prefix(*argv, "key")) {
1274 if (parse_u32_arg(&argc, &argv, &key_size,
1275 "key size"))
1276 goto exit;
1277 } else if (is_prefix(*argv, "value")) {
1278 if (parse_u32_arg(&argc, &argv, &value_size,
1279 "value size"))
1280 goto exit;
1281 } else if (is_prefix(*argv, "entries")) {
1282 if (parse_u32_arg(&argc, &argv, &max_entries,
1283 "max entries"))
1284 goto exit;
1285 } else if (is_prefix(*argv, "flags")) {
1286 if (parse_u32_arg(&argc, &argv, &attr.map_flags,
1287 "flags"))
1288 goto exit;
1289 } else if (is_prefix(*argv, "dev")) {
1290 p_info("Warning: 'bpftool map create [...] dev <ifname>' syntax is deprecated.\n"
1291 "Going further, please use 'offload_dev <ifname>' to request hardware offload for the map.");
1292 goto offload_dev;
1293 } else if (is_prefix(*argv, "offload_dev")) {
1294 offload_dev:
1295 NEXT_ARG();
1296
1297 if (attr.map_ifindex) {
1298 p_err("offload device already specified");
1299 goto exit;
1300 }
1301
1302 attr.map_ifindex = if_nametoindex(*argv);
1303 if (!attr.map_ifindex) {
1304 p_err("unrecognized netdevice '%s': %s",
1305 *argv, strerror(errno));
1306 goto exit;
1307 }
1308 NEXT_ARG();
1309 } else if (is_prefix(*argv, "inner_map")) {
1310 struct bpf_map_info info = {};
1311 __u32 len = sizeof(info);
1312 int inner_map_fd;
1313
1314 NEXT_ARG();
1315 if (!REQ_ARGS(2))
1316 usage();
1317 inner_map_fd = map_parse_fd_and_info(&argc, &argv,
1318 &info, &len);
1319 if (inner_map_fd < 0)
1320 return -1;
1321 attr.inner_map_fd = inner_map_fd;
1322 } else {
1323 p_err("unknown arg %s", *argv);
1324 goto exit;
1325 }
1326 }
1327
1328 if (!map_name) {
1329 p_err("map name not specified");
1330 goto exit;
1331 }
1332
1333 set_max_rlimit();
1334
1335 fd = bpf_map_create(map_type, map_name, key_size, value_size, max_entries, &attr);
1336 if (fd < 0) {
1337 p_err("map create failed: %s", strerror(errno));
1338 goto exit;
1339 }
1340
1341 err = do_pin_fd(fd, pinfile);
1342 close(fd);
1343 if (err)
1344 goto exit;
1345
1346 if (json_output)
1347 jsonw_null(json_wtr);
1348
1349 exit:
1350 if (attr.inner_map_fd > 0)
1351 close(attr.inner_map_fd);
1352
1353 return err;
1354 }
1355
1356 static int do_pop_dequeue(int argc, char **argv)
1357 {
1358 struct bpf_map_info info = {};
1359 __u32 len = sizeof(info);
1360 void *key, *value;
1361 int err;
1362 int fd;
1363
1364 if (argc < 2)
1365 usage();
1366
1367 fd = map_parse_fd_and_info(&argc, &argv, &info, &len);
1368 if (fd < 0)
1369 return -1;
1370
1371 err = alloc_key_value(&info, &key, &value);
1372 if (err)
1373 goto exit_free;
1374
1375 err = bpf_map_lookup_and_delete_elem(fd, key, value);
1376 if (err) {
1377 if (errno == ENOENT) {
1378 if (json_output)
1379 jsonw_null(json_wtr);
1380 else
1381 printf("Error: empty map\n");
1382 } else {
1383 p_err("pop failed: %s", strerror(errno));
1384 }
1385
1386 goto exit_free;
1387 }
1388
1389 print_key_value(&info, key, value);
1390
1391 exit_free:
1392 free(key);
1393 free(value);
1394 close(fd);
1395
1396 return err;
1397 }
1398
1399 static int do_freeze(int argc, char **argv)
1400 {
1401 int err, fd;
1402
1403 if (!REQ_ARGS(2))
1404 return -1;
1405
1406 fd = map_parse_fd(&argc, &argv);
1407 if (fd < 0)
1408 return -1;
1409
1410 if (argc) {
1411 close(fd);
1412 return BAD_ARG();
1413 }
1414
1415 err = bpf_map_freeze(fd);
1416 close(fd);
1417 if (err) {
1418 p_err("failed to freeze map: %s", strerror(errno));
1419 return err;
1420 }
1421
1422 if (json_output)
1423 jsonw_null(json_wtr);
1424
1425 return 0;
1426 }
1427
1428 static int do_help(int argc, char **argv)
1429 {
1430 if (json_output) {
1431 jsonw_null(json_wtr);
1432 return 0;
1433 }
1434
1435 fprintf(stderr,
1436 "Usage: %1$s %2$s { show | list } [MAP]\n"
1437 " %1$s %2$s create FILE type TYPE key KEY_SIZE value VALUE_SIZE \\\n"
1438 " entries MAX_ENTRIES name NAME [flags FLAGS] \\\n"
1439 " [inner_map MAP] [offload_dev NAME]\n"
1440 " %1$s %2$s dump MAP\n"
1441 " %1$s %2$s update MAP [key DATA] [value VALUE] [UPDATE_FLAGS]\n"
1442 " %1$s %2$s lookup MAP [key DATA]\n"
1443 " %1$s %2$s getnext MAP [key DATA]\n"
1444 " %1$s %2$s delete MAP key DATA\n"
1445 " %1$s %2$s pin MAP FILE\n"
1446 " %1$s %2$s event_pipe MAP [cpu N index M]\n"
1447 " %1$s %2$s peek MAP\n"
1448 " %1$s %2$s push MAP value VALUE\n"
1449 " %1$s %2$s pop MAP\n"
1450 " %1$s %2$s enqueue MAP value VALUE\n"
1451 " %1$s %2$s dequeue MAP\n"
1452 " %1$s %2$s freeze MAP\n"
1453 " %1$s %2$s help\n"
1454 "\n"
1455 " " HELP_SPEC_MAP "\n"
1456 " DATA := { [hex] BYTES }\n"
1457 " " HELP_SPEC_PROGRAM "\n"
1458 " VALUE := { DATA | MAP | PROG }\n"
1459 " UPDATE_FLAGS := { any | exist | noexist }\n"
1460 " TYPE := { hash | array | prog_array | perf_event_array | percpu_hash |\n"
1461 " percpu_array | stack_trace | cgroup_array | lru_hash |\n"
1462 " lru_percpu_hash | lpm_trie | array_of_maps | hash_of_maps |\n"
1463 " devmap | devmap_hash | sockmap | cpumap | xskmap | sockhash |\n"
1464 " cgroup_storage | reuseport_sockarray | percpu_cgroup_storage |\n"
1465 " queue | stack | sk_storage | struct_ops | ringbuf | inode_storage |\n"
1466 " task_storage | bloom_filter | user_ringbuf | cgrp_storage | arena }\n"
1467 " " HELP_SPEC_OPTIONS " |\n"
1468 " {-f|--bpffs} | {-n|--nomount} }\n"
1469 "",
1470 bin_name, argv[-2]);
1471
1472 return 0;
1473 }
1474
1475 static const struct cmd cmds[] = {
1476 { "show", do_show },
1477 { "list", do_show },
1478 { "help", do_help },
1479 { "dump", do_dump },
1480 { "update", do_update },
1481 { "lookup", do_lookup },
1482 { "getnext", do_getnext },
1483 { "delete", do_delete },
1484 { "pin", do_pin },
1485 { "event_pipe", do_event_pipe },
1486 { "create", do_create },
1487 { "peek", do_lookup },
1488 { "push", do_update },
1489 { "enqueue", do_update },
1490 { "pop", do_pop_dequeue },
1491 { "dequeue", do_pop_dequeue },
1492 { "freeze", do_freeze },
1493 { 0 }
1494 };
1495
1496 int do_map(int argc, char **argv)
1497 {
1498 return cmd_select(cmds, argc, argv, do_help);
1499 }
Kernel DRM miscellaneous fixes and cross-tree changes