1 // SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
2
3 #include "util/bpf_map.h"
4 #include <bpf/bpf.h>
5 #include <bpf/libbpf.h>
6 #include <linux/err.h>
7 #include <linux/kernel.h>
8 #include <stdbool.h>
9 #include <stdlib.h>
10 #include <unistd.h>
11
12 static bool bpf_map__is_per_cpu(enum bpf_map_type type)
13 {
14 return type == BPF_MAP_TYPE_PERCPU_HASH ||
15 type == BPF_MAP_TYPE_PERCPU_ARRAY ||
16 type == BPF_MAP_TYPE_LRU_PERCPU_HASH ||
17 type == BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE;
18 }
19
20 static void *bpf_map__alloc_value(const struct bpf_map *map)
21 {
22 if (bpf_map__is_per_cpu(bpf_map__type(map)))
23 return malloc(round_up(bpf_map__value_size(map), 8) *
24 sysconf(_SC_NPROCESSORS_CONF));
25
26 return malloc(bpf_map__value_size(map));
27 }
28
29 int bpf_map__fprintf(struct bpf_map *map, FILE *fp)
30 {
31 void *prev_key = NULL, *key, *value;
32 int fd = bpf_map__fd(map), err;
33 int printed = 0;
34
35 if (fd < 0)
36 return fd;
37
38 if (!map)
39 return PTR_ERR(map);
40
41 err = -ENOMEM;
42 key = malloc(bpf_map__key_size(map));
43 if (key == NULL)
44 goto out;
45
46 value = bpf_map__alloc_value(map);
47 if (value == NULL)
48 goto out_free_key;
49
50 while ((err = bpf_map_get_next_key(fd, prev_key, key) == 0)) {
51 int intkey = *(int *)key;
52
53 if (!bpf_map_lookup_elem(fd, key, value)) {
54 bool boolval = *(bool *)value;
55 if (boolval)
56 printed += fprintf(fp, "[%d] = %d,\n", intkey, boolval);
57 } else {
58 printed += fprintf(fp, "[%d] = ERROR,\n", intkey);
59 }
60
61 prev_key = key;
62 }
63
64 if (err == ENOENT)
65 err = printed;
66
67 free(value);
68 out_free_key:
69 free(key);
70 out:
71 return err;
72 }
73
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.