1 // SPDX-License-Identifier: GPL-2.0-only
2
3 /*
4 * Copyright 2020 Google LLC.
5 */
6
7 #include <test_progs.h>
8 #include <cgroup_helpers.h>
9 #include <network_helpers.h>
10
11 #include "metadata_unused.skel.h"
12 #include "metadata_used.skel.h"
13
14 static int duration;
15
16 static int prog_holds_map(int prog_fd, int map_fd)
17 {
18 struct bpf_prog_info prog_info = {};
19 struct bpf_map_info map_info = {};
20 __u32 prog_info_len;
21 __u32 map_info_len;
22 __u32 *map_ids;
23 int nr_maps;
24 int ret;
25 int i;
26
27 map_info_len = sizeof(map_info);
28 ret = bpf_map_get_info_by_fd(map_fd, &map_info, &map_info_len);
29 if (ret)
30 return -errno;
31
32 prog_info_len = sizeof(prog_info);
33 ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
34 if (ret)
35 return -errno;
36
37 map_ids = calloc(prog_info.nr_map_ids, sizeof(__u32));
38 if (!map_ids)
39 return -ENOMEM;
40
41 nr_maps = prog_info.nr_map_ids;
42 memset(&prog_info, 0, sizeof(prog_info));
43 prog_info.nr_map_ids = nr_maps;
44 prog_info.map_ids = ptr_to_u64(map_ids);
45 prog_info_len = sizeof(prog_info);
46
47 ret = bpf_prog_get_info_by_fd(prog_fd, &prog_info, &prog_info_len);
48 if (ret) {
49 ret = -errno;
50 goto free_map_ids;
51 }
52
53 ret = -ENOENT;
54 for (i = 0; i < prog_info.nr_map_ids; i++) {
55 if (map_ids[i] == map_info.id) {
56 ret = 0;
57 break;
58 }
59 }
60
61 free_map_ids:
62 free(map_ids);
63 return ret;
64 }
65
66 static void test_metadata_unused(void)
67 {
68 struct metadata_unused *obj;
69 int err;
70
71 obj = metadata_unused__open_and_load();
72 if (CHECK(!obj, "skel-load", "errno %d", errno))
73 return;
74
75 err = prog_holds_map(bpf_program__fd(obj->progs.prog),
76 bpf_map__fd(obj->maps.rodata));
77 if (CHECK(err, "prog-holds-rodata", "errno: %d", err))
78 return;
79
80 /* Assert that we can access the metadata in skel and the values are
81 * what we expect.
82 */
83 if (CHECK(strncmp(obj->rodata->bpf_metadata_a, "foo",
84 sizeof(obj->rodata->bpf_metadata_a)),
85 "bpf_metadata_a", "expected \"foo\", value differ"))
86 goto close_bpf_object;
87 if (CHECK(obj->rodata->bpf_metadata_b != 1, "bpf_metadata_b",
88 "expected 1, got %d", obj->rodata->bpf_metadata_b))
89 goto close_bpf_object;
90
91 /* Assert that binding metadata map to prog again succeeds. */
92 err = bpf_prog_bind_map(bpf_program__fd(obj->progs.prog),
93 bpf_map__fd(obj->maps.rodata), NULL);
94 CHECK(err, "rebind_map", "errno %d, expected 0", errno);
95
96 close_bpf_object:
97 metadata_unused__destroy(obj);
98 }
99
100 static void test_metadata_used(void)
101 {
102 struct metadata_used *obj;
103 int err;
104
105 obj = metadata_used__open_and_load();
106 if (CHECK(!obj, "skel-load", "errno %d", errno))
107 return;
108
109 err = prog_holds_map(bpf_program__fd(obj->progs.prog),
110 bpf_map__fd(obj->maps.rodata));
111 if (CHECK(err, "prog-holds-rodata", "errno: %d", err))
112 return;
113
114 /* Assert that we can access the metadata in skel and the values are
115 * what we expect.
116 */
117 if (CHECK(strncmp(obj->rodata->bpf_metadata_a, "bar",
118 sizeof(obj->rodata->bpf_metadata_a)),
119 "metadata_a", "expected \"bar\", value differ"))
120 goto close_bpf_object;
121 if (CHECK(obj->rodata->bpf_metadata_b != 2, "metadata_b",
122 "expected 2, got %d", obj->rodata->bpf_metadata_b))
123 goto close_bpf_object;
124
125 /* Assert that binding metadata map to prog again succeeds. */
126 err = bpf_prog_bind_map(bpf_program__fd(obj->progs.prog),
127 bpf_map__fd(obj->maps.rodata), NULL);
128 CHECK(err, "rebind_map", "errno %d, expected 0", errno);
129
130 close_bpf_object:
131 metadata_used__destroy(obj);
132 }
133
134 void test_metadata(void)
135 {
136 if (test__start_subtest("unused"))
137 test_metadata_unused();
138
139 if (test__start_subtest("used"))
140 test_metadata_used();
141 }
142
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