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 
prog_holds_map(int prog_fd,int map_fd)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 
test_metadata_unused(void)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 
test_metadata_used(void)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 
test_metadata(void)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