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1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3
4void test_bpf_obj_id(void)
5{
6 const __u64 array_magic_value = 0xfaceb00c;
7 const __u32 array_key = 0;
8 const int nr_iters = 2;
9 const char *file = "./test_obj_id.o";
10 const char *expected_prog_name = "test_obj_id";
11 const char *expected_map_name = "test_map_id";
12 const __u64 nsec_per_sec = 1000000000;
13
14 struct bpf_object *objs[nr_iters];
15 int prog_fds[nr_iters], map_fds[nr_iters];
16 /* +1 to test for the info_len returned by kernel */
17 struct bpf_prog_info prog_infos[nr_iters + 1];
18 struct bpf_map_info map_infos[nr_iters + 1];
19 /* Each prog only uses one map. +1 to test nr_map_ids
20 * returned by kernel.
21 */
22 __u32 map_ids[nr_iters + 1];
23 char jited_insns[128], xlated_insns[128], zeros[128];
24 __u32 i, next_id, info_len, nr_id_found, duration = 0;
25 struct timespec real_time_ts, boot_time_ts;
26 int err = 0;
27 __u64 array_value;
28 uid_t my_uid = getuid();
29 time_t now, load_time;
30
31 err = bpf_prog_get_fd_by_id(0);
32 CHECK(err >= 0 || errno != ENOENT,
33 "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno);
34
35 err = bpf_map_get_fd_by_id(0);
36 CHECK(err >= 0 || errno != ENOENT,
37 "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);
38
39 for (i = 0; i < nr_iters; i++)
40 objs[i] = NULL;
41
42 /* Check bpf_obj_get_info_by_fd() */
43 bzero(zeros, sizeof(zeros));
44 for (i = 0; i < nr_iters; i++) {
45 now = time(NULL);
46 err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
47 &objs[i], &prog_fds[i]);
48 /* test_obj_id.o is a dumb prog. It should never fail
49 * to load.
50 */
51 if (CHECK_FAIL(err))
52 continue;
53
54 /* Insert a magic value to the map */
55 map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
56 if (CHECK_FAIL(map_fds[i] < 0))
57 goto done;
58 err = bpf_map_update_elem(map_fds[i], &array_key,
59 &array_magic_value, 0);
60 if (CHECK_FAIL(err))
61 goto done;
62
63 /* Check getting map info */
64 info_len = sizeof(struct bpf_map_info) * 2;
65 bzero(&map_infos[i], info_len);
66 err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i],
67 &info_len);
68 if (CHECK(err ||
69 map_infos[i].type != BPF_MAP_TYPE_ARRAY ||
70 map_infos[i].key_size != sizeof(__u32) ||
71 map_infos[i].value_size != sizeof(__u64) ||
72 map_infos[i].max_entries != 1 ||
73 map_infos[i].map_flags != 0 ||
74 info_len != sizeof(struct bpf_map_info) ||
75 strcmp((char *)map_infos[i].name, expected_map_name),
76 "get-map-info(fd)",
77 "err %d errno %d type %d(%d) info_len %u(%zu) key_size %u value_size %u max_entries %u map_flags %X name %s(%s)\n",
78 err, errno,
79 map_infos[i].type, BPF_MAP_TYPE_ARRAY,
80 info_len, sizeof(struct bpf_map_info),
81 map_infos[i].key_size,
82 map_infos[i].value_size,
83 map_infos[i].max_entries,
84 map_infos[i].map_flags,
85 map_infos[i].name, expected_map_name))
86 goto done;
87
88 /* Check getting prog info */
89 info_len = sizeof(struct bpf_prog_info) * 2;
90 bzero(&prog_infos[i], info_len);
91 bzero(jited_insns, sizeof(jited_insns));
92 bzero(xlated_insns, sizeof(xlated_insns));
93 prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns);
94 prog_infos[i].jited_prog_len = sizeof(jited_insns);
95 prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
96 prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
97 prog_infos[i].map_ids = ptr_to_u64(map_ids + i);
98 prog_infos[i].nr_map_ids = 2;
99 err = clock_gettime(CLOCK_REALTIME, &real_time_ts);
100 if (CHECK_FAIL(err))
101 goto done;
102 err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts);
103 if (CHECK_FAIL(err))
104 goto done;
105 err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
106 &info_len);
107 load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec)
108 + (prog_infos[i].load_time / nsec_per_sec);
109 if (CHECK(err ||
110 prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
111 info_len != sizeof(struct bpf_prog_info) ||
112 (env.jit_enabled && !prog_infos[i].jited_prog_len) ||
113 (env.jit_enabled &&
114 !memcmp(jited_insns, zeros, sizeof(zeros))) ||
115 !prog_infos[i].xlated_prog_len ||
116 !memcmp(xlated_insns, zeros, sizeof(zeros)) ||
117 load_time < now - 60 || load_time > now + 60 ||
118 prog_infos[i].created_by_uid != my_uid ||
119 prog_infos[i].nr_map_ids != 1 ||
120 *(int *)(long)prog_infos[i].map_ids != map_infos[i].id ||
121 strcmp((char *)prog_infos[i].name, expected_prog_name),
122 "get-prog-info(fd)",
123 "err %d errno %d i %d type %d(%d) info_len %u(%zu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d load_time %lu(%lu) uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) name %s(%s)\n",
124 err, errno, i,
125 prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
126 info_len, sizeof(struct bpf_prog_info),
127 env.jit_enabled,
128 prog_infos[i].jited_prog_len,
129 prog_infos[i].xlated_prog_len,
130 !!memcmp(jited_insns, zeros, sizeof(zeros)),
131 !!memcmp(xlated_insns, zeros, sizeof(zeros)),
132 load_time, now,
133 prog_infos[i].created_by_uid, my_uid,
134 prog_infos[i].nr_map_ids, 1,
135 *(int *)(long)prog_infos[i].map_ids, map_infos[i].id,
136 prog_infos[i].name, expected_prog_name))
137 goto done;
138 }
139
140 /* Check bpf_prog_get_next_id() */
141 nr_id_found = 0;
142 next_id = 0;
143 while (!bpf_prog_get_next_id(next_id, &next_id)) {
144 struct bpf_prog_info prog_info = {};
145 __u32 saved_map_id;
146 int prog_fd;
147
148 info_len = sizeof(prog_info);
149
150 prog_fd = bpf_prog_get_fd_by_id(next_id);
151 if (prog_fd < 0 && errno == ENOENT)
152 /* The bpf_prog is in the dead row */
153 continue;
154 if (CHECK(prog_fd < 0, "get-prog-fd(next_id)",
155 "prog_fd %d next_id %d errno %d\n",
156 prog_fd, next_id, errno))
157 break;
158
159 for (i = 0; i < nr_iters; i++)
160 if (prog_infos[i].id == next_id)
161 break;
162
163 if (i == nr_iters)
164 continue;
165
166 nr_id_found++;
167
168 /* Negative test:
169 * prog_info.nr_map_ids = 1
170 * prog_info.map_ids = NULL
171 */
172 prog_info.nr_map_ids = 1;
173 err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
174 if (CHECK(!err || errno != EFAULT,
175 "get-prog-fd-bad-nr-map-ids", "err %d errno %d(%d)",
176 err, errno, EFAULT))
177 break;
178 bzero(&prog_info, sizeof(prog_info));
179 info_len = sizeof(prog_info);
180
181 saved_map_id = *(int *)((long)prog_infos[i].map_ids);
182 prog_info.map_ids = prog_infos[i].map_ids;
183 prog_info.nr_map_ids = 2;
184 err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
185 prog_infos[i].jited_prog_insns = 0;
186 prog_infos[i].xlated_prog_insns = 0;
187 CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
188 memcmp(&prog_info, &prog_infos[i], info_len) ||
189 *(int *)(long)prog_info.map_ids != saved_map_id,
190 "get-prog-info(next_id->fd)",
191 "err %d errno %d info_len %u(%zu) memcmp %d map_id %u(%u)\n",
192 err, errno, info_len, sizeof(struct bpf_prog_info),
193 memcmp(&prog_info, &prog_infos[i], info_len),
194 *(int *)(long)prog_info.map_ids, saved_map_id);
195 close(prog_fd);
196 }
197 CHECK(nr_id_found != nr_iters,
198 "check total prog id found by get_next_id",
199 "nr_id_found %u(%u)\n",
200 nr_id_found, nr_iters);
201
202 /* Check bpf_map_get_next_id() */
203 nr_id_found = 0;
204 next_id = 0;
205 while (!bpf_map_get_next_id(next_id, &next_id)) {
206 struct bpf_map_info map_info = {};
207 int map_fd;
208
209 info_len = sizeof(map_info);
210
211 map_fd = bpf_map_get_fd_by_id(next_id);
212 if (map_fd < 0 && errno == ENOENT)
213 /* The bpf_map is in the dead row */
214 continue;
215 if (CHECK(map_fd < 0, "get-map-fd(next_id)",
216 "map_fd %d next_id %u errno %d\n",
217 map_fd, next_id, errno))
218 break;
219
220 for (i = 0; i < nr_iters; i++)
221 if (map_infos[i].id == next_id)
222 break;
223
224 if (i == nr_iters)
225 continue;
226
227 nr_id_found++;
228
229 err = bpf_map_lookup_elem(map_fd, &array_key, &array_value);
230 if (CHECK_FAIL(err))
231 goto done;
232
233 err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
234 CHECK(err || info_len != sizeof(struct bpf_map_info) ||
235 memcmp(&map_info, &map_infos[i], info_len) ||
236 array_value != array_magic_value,
237 "check get-map-info(next_id->fd)",
238 "err %d errno %d info_len %u(%zu) memcmp %d array_value %llu(%llu)\n",
239 err, errno, info_len, sizeof(struct bpf_map_info),
240 memcmp(&map_info, &map_infos[i], info_len),
241 array_value, array_magic_value);
242
243 close(map_fd);
244 }
245 CHECK(nr_id_found != nr_iters,
246 "check total map id found by get_next_id",
247 "nr_id_found %u(%u)\n",
248 nr_id_found, nr_iters);
249
250done:
251 for (i = 0; i < nr_iters; i++)
252 bpf_object__close(objs[i]);
253}