bpf/prog_tests/bpf_obj_id.c

0001 // SPDX-License-Identifier: GPL-2.0
0002 #include <test_progs.h>
0003
0004 #define nr_iters 2
0005
0006 void serial_test_bpf_obj_id(void)
0007 {
0008     const __u64 array_magic_value = 0xfaceb00c;
0009     const __u32 array_key = 0;
0010     const char *file = "./test_obj_id.o";
0011     const char *expected_prog_name = "test_obj_id";
0012     const char *expected_map_name = "test_map_id";
0013     const __u64 nsec_per_sec = 1000000000;
0014
0015     struct bpf_object *objs[nr_iters] = {};
0016     struct bpf_link *links[nr_iters] = {};
0017     struct bpf_program *prog;
0018     int prog_fds[nr_iters], map_fds[nr_iters];
0019     /* +1 to test for the info_len returned by kernel */
0020     struct bpf_prog_info prog_infos[nr_iters + 1];
0021     struct bpf_map_info map_infos[nr_iters + 1];
0022     struct bpf_link_info link_infos[nr_iters + 1];
0023     /* Each prog only uses one map. +1 to test nr_map_ids
0024      * returned by kernel.
0025      */
0026     __u32 map_ids[nr_iters + 1];
0027     char jited_insns[128], xlated_insns[128], zeros[128], tp_name[128];
0028     __u32 i, next_id, info_len, nr_id_found, duration = 0;
0029     struct timespec real_time_ts, boot_time_ts;
0030     int err = 0;
0031     __u64 array_value;
0032     uid_t my_uid = getuid();
0033     time_t now, load_time;
0034
0035     err = bpf_prog_get_fd_by_id(0);
0036     CHECK(err >= 0 || errno != ENOENT,
0037           "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno);
0038
0039     err = bpf_map_get_fd_by_id(0);
0040     CHECK(err >= 0 || errno != ENOENT,
0041           "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno);
0042
0043     err = bpf_link_get_fd_by_id(0);
0044     CHECK(err >= 0 || errno != ENOENT,
0045           "get-fd-by-notexist-link-id", "err %d errno %d\n", err, errno);
0046
0047     /* Check bpf_obj_get_info_by_fd() */
0048     bzero(zeros, sizeof(zeros));
0049     for (i = 0; i < nr_iters; i++) {
0050         now = time(NULL);
0051         err = bpf_prog_test_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT,
0052                     &objs[i], &prog_fds[i]);
0053         /* test_obj_id.o is a dumb prog. It should never fail
0054          * to load.
0055          */
0056         if (CHECK_FAIL(err))
0057             continue;
0058
0059         /* Insert a magic value to the map */
0060         map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id");
0061         if (CHECK_FAIL(map_fds[i] < 0))
0062             goto done;
0063         err = bpf_map_update_elem(map_fds[i], &array_key,
0064                       &array_magic_value, 0);
0065         if (CHECK_FAIL(err))
0066             goto done;
0067
0068         prog = bpf_object__find_program_by_name(objs[i],
0069                             "test_obj_id");
0070         if (CHECK_FAIL(!prog))
0071             goto done;
0072         links[i] = bpf_program__attach(prog);
0073         err = libbpf_get_error(links[i]);
0074         if (CHECK(err, "prog_attach", "prog #%d, err %d\n", i, err)) {
0075             links[i] = NULL;
0076             goto done;
0077         }
0078
0079         /* Check getting map info */
0080         info_len = sizeof(struct bpf_map_info) * 2;
0081         bzero(&map_infos[i], info_len);
0082         err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i],
0083                          &info_len);
0084         if (CHECK(err ||
0085               map_infos[i].type != BPF_MAP_TYPE_ARRAY ||
0086               map_infos[i].key_size != sizeof(__u32) ||
0087               map_infos[i].value_size != sizeof(__u64) ||
0088               map_infos[i].max_entries != 1 ||
0089               map_infos[i].map_flags != 0 ||
0090               info_len != sizeof(struct bpf_map_info) ||
0091               strcmp((char *)map_infos[i].name, expected_map_name),
0092               "get-map-info(fd)",
0093               "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",
0094               err, errno,
0095               map_infos[i].type, BPF_MAP_TYPE_ARRAY,
0096               info_len, sizeof(struct bpf_map_info),
0097               map_infos[i].key_size,
0098               map_infos[i].value_size,
0099               map_infos[i].max_entries,
0100               map_infos[i].map_flags,
0101               map_infos[i].name, expected_map_name))
0102             goto done;
0103
0104         /* Check getting prog info */
0105         info_len = sizeof(struct bpf_prog_info) * 2;
0106         bzero(&prog_infos[i], info_len);
0107         bzero(jited_insns, sizeof(jited_insns));
0108         bzero(xlated_insns, sizeof(xlated_insns));
0109         prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns);
0110         prog_infos[i].jited_prog_len = sizeof(jited_insns);
0111         prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
0112         prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
0113         prog_infos[i].map_ids = ptr_to_u64(map_ids + i);
0114         prog_infos[i].nr_map_ids = 2;
0115         err = clock_gettime(CLOCK_REALTIME, &real_time_ts);
0116         if (CHECK_FAIL(err))
0117             goto done;
0118         err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts);
0119         if (CHECK_FAIL(err))
0120             goto done;
0121         err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
0122                          &info_len);
0123         load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec)
0124             + (prog_infos[i].load_time / nsec_per_sec);
0125         if (CHECK(err ||
0126               prog_infos[i].type != BPF_PROG_TYPE_RAW_TRACEPOINT ||
0127               info_len != sizeof(struct bpf_prog_info) ||
0128               (env.jit_enabled && !prog_infos[i].jited_prog_len) ||
0129               (env.jit_enabled &&
0130                !memcmp(jited_insns, zeros, sizeof(zeros))) ||
0131               !prog_infos[i].xlated_prog_len ||
0132               !memcmp(xlated_insns, zeros, sizeof(zeros)) ||
0133               load_time < now - 60 || load_time > now + 60 ||
0134               prog_infos[i].created_by_uid != my_uid ||
0135               prog_infos[i].nr_map_ids != 1 ||
0136               *(int *)(long)prog_infos[i].map_ids != map_infos[i].id ||
0137               strcmp((char *)prog_infos[i].name, expected_prog_name),
0138               "get-prog-info(fd)",
0139               "err %d errno %d i %d type %d(%d) info_len %u(%zu) "
0140               "jit_enabled %d jited_prog_len %u xlated_prog_len %u "
0141               "jited_prog %d xlated_prog %d load_time %lu(%lu) "
0142               "uid %u(%u) nr_map_ids %u(%u) map_id %u(%u) "
0143               "name %s(%s)\n",
0144               err, errno, i,
0145               prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
0146               info_len, sizeof(struct bpf_prog_info),
0147               env.jit_enabled,
0148               prog_infos[i].jited_prog_len,
0149               prog_infos[i].xlated_prog_len,
0150               !!memcmp(jited_insns, zeros, sizeof(zeros)),
0151               !!memcmp(xlated_insns, zeros, sizeof(zeros)),
0152               load_time, now,
0153               prog_infos[i].created_by_uid, my_uid,
0154               prog_infos[i].nr_map_ids, 1,
0155               *(int *)(long)prog_infos[i].map_ids, map_infos[i].id,
0156               prog_infos[i].name, expected_prog_name))
0157             goto done;
0158
0159         /* Check getting link info */
0160         info_len = sizeof(struct bpf_link_info) * 2;
0161         bzero(&link_infos[i], info_len);
0162         link_infos[i].raw_tracepoint.tp_name = ptr_to_u64(&tp_name);
0163         link_infos[i].raw_tracepoint.tp_name_len = sizeof(tp_name);
0164         err = bpf_obj_get_info_by_fd(bpf_link__fd(links[i]),
0165                          &link_infos[i], &info_len);
0166         if (CHECK(err ||
0167               link_infos[i].type != BPF_LINK_TYPE_RAW_TRACEPOINT ||
0168               link_infos[i].prog_id != prog_infos[i].id ||
0169               link_infos[i].raw_tracepoint.tp_name != ptr_to_u64(&tp_name) ||
0170               strcmp(u64_to_ptr(link_infos[i].raw_tracepoint.tp_name),
0171                  "sys_enter") ||
0172               info_len != sizeof(struct bpf_link_info),
0173               "get-link-info(fd)",
0174               "err %d errno %d info_len %u(%zu) type %d(%d) id %d "
0175               "prog_id %d (%d) tp_name %s(%s)\n",
0176               err, errno,
0177               info_len, sizeof(struct bpf_link_info),
0178               link_infos[i].type, BPF_LINK_TYPE_RAW_TRACEPOINT,
0179               link_infos[i].id,
0180               link_infos[i].prog_id, prog_infos[i].id,
0181               (const char *)u64_to_ptr(link_infos[i].raw_tracepoint.tp_name),
0182               "sys_enter"))
0183             goto done;
0184
0185     }
0186
0187     /* Check bpf_prog_get_next_id() */
0188     nr_id_found = 0;
0189     next_id = 0;
0190     while (!bpf_prog_get_next_id(next_id, &next_id)) {
0191         struct bpf_prog_info prog_info = {};
0192         __u32 saved_map_id;
0193         int prog_fd;
0194
0195         info_len = sizeof(prog_info);
0196
0197         prog_fd = bpf_prog_get_fd_by_id(next_id);
0198         if (prog_fd < 0 && errno == ENOENT)
0199             /* The bpf_prog is in the dead row */
0200             continue;
0201         if (CHECK(prog_fd < 0, "get-prog-fd(next_id)",
0202               "prog_fd %d next_id %d errno %d\n",
0203               prog_fd, next_id, errno))
0204             break;
0205
0206         for (i = 0; i < nr_iters; i++)
0207             if (prog_infos[i].id == next_id)
0208                 break;
0209
0210         if (i == nr_iters)
0211             continue;
0212
0213         nr_id_found++;
0214
0215         /* Negative test:
0216          * prog_info.nr_map_ids = 1
0217          * prog_info.map_ids = NULL
0218          */
0219         prog_info.nr_map_ids = 1;
0220         err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
0221         if (CHECK(!err || errno != EFAULT,
0222               "get-prog-fd-bad-nr-map-ids", "err %d errno %d(%d)",
0223               err, errno, EFAULT))
0224             break;
0225         bzero(&prog_info, sizeof(prog_info));
0226         info_len = sizeof(prog_info);
0227
0228         saved_map_id = *(int *)((long)prog_infos[i].map_ids);
0229         prog_info.map_ids = prog_infos[i].map_ids;
0230         prog_info.nr_map_ids = 2;
0231         err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
0232         prog_infos[i].jited_prog_insns = 0;
0233         prog_infos[i].xlated_prog_insns = 0;
0234         CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
0235               memcmp(&prog_info, &prog_infos[i], info_len) ||
0236               *(int *)(long)prog_info.map_ids != saved_map_id,
0237               "get-prog-info(next_id->fd)",
0238               "err %d errno %d info_len %u(%zu) memcmp %d map_id %u(%u)\n",
0239               err, errno, info_len, sizeof(struct bpf_prog_info),
0240               memcmp(&prog_info, &prog_infos[i], info_len),
0241               *(int *)(long)prog_info.map_ids, saved_map_id);
0242         close(prog_fd);
0243     }
0244     CHECK(nr_id_found != nr_iters,
0245           "check total prog id found by get_next_id",
0246           "nr_id_found %u(%u)\n",
0247           nr_id_found, nr_iters);
0248
0249     /* Check bpf_map_get_next_id() */
0250     nr_id_found = 0;
0251     next_id = 0;
0252     while (!bpf_map_get_next_id(next_id, &next_id)) {
0253         struct bpf_map_info map_info = {};
0254         int map_fd;
0255
0256         info_len = sizeof(map_info);
0257
0258         map_fd = bpf_map_get_fd_by_id(next_id);
0259         if (map_fd < 0 && errno == ENOENT)
0260             /* The bpf_map is in the dead row */
0261             continue;
0262         if (CHECK(map_fd < 0, "get-map-fd(next_id)",
0263               "map_fd %d next_id %u errno %d\n",
0264               map_fd, next_id, errno))
0265             break;
0266
0267         for (i = 0; i < nr_iters; i++)
0268             if (map_infos[i].id == next_id)
0269                 break;
0270
0271         if (i == nr_iters)
0272             continue;
0273
0274         nr_id_found++;
0275
0276         err = bpf_map_lookup_elem(map_fd, &array_key, &array_value);
0277         if (CHECK_FAIL(err))
0278             goto done;
0279
0280         err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len);
0281         CHECK(err || info_len != sizeof(struct bpf_map_info) ||
0282               memcmp(&map_info, &map_infos[i], info_len) ||
0283               array_value != array_magic_value,
0284               "check get-map-info(next_id->fd)",
0285               "err %d errno %d info_len %u(%zu) memcmp %d array_value %llu(%llu)\n",
0286               err, errno, info_len, sizeof(struct bpf_map_info),
0287               memcmp(&map_info, &map_infos[i], info_len),
0288               array_value, array_magic_value);
0289
0290         close(map_fd);
0291     }
0292     CHECK(nr_id_found != nr_iters,
0293           "check total map id found by get_next_id",
0294           "nr_id_found %u(%u)\n",
0295           nr_id_found, nr_iters);
0296
0297     /* Check bpf_link_get_next_id() */
0298     nr_id_found = 0;
0299     next_id = 0;
0300     while (!bpf_link_get_next_id(next_id, &next_id)) {
0301         struct bpf_link_info link_info;
0302         int link_fd, cmp_res;
0303
0304         info_len = sizeof(link_info);
0305         memset(&link_info, 0, info_len);
0306
0307         link_fd = bpf_link_get_fd_by_id(next_id);
0308         if (link_fd < 0 && errno == ENOENT)
0309             /* The bpf_link is in the dead row */
0310             continue;
0311         if (CHECK(link_fd < 0, "get-link-fd(next_id)",
0312               "link_fd %d next_id %u errno %d\n",
0313               link_fd, next_id, errno))
0314             break;
0315
0316         for (i = 0; i < nr_iters; i++)
0317             if (link_infos[i].id == next_id)
0318                 break;
0319
0320         if (i == nr_iters)
0321             continue;
0322
0323         nr_id_found++;
0324
0325         err = bpf_obj_get_info_by_fd(link_fd, &link_info, &info_len);
0326         cmp_res = memcmp(&link_info, &link_infos[i],
0327                 offsetof(struct bpf_link_info, raw_tracepoint));
0328         CHECK(err || info_len != sizeof(link_info) || cmp_res,
0329               "check get-link-info(next_id->fd)",
0330               "err %d errno %d info_len %u(%zu) memcmp %d\n",
0331               err, errno, info_len, sizeof(struct bpf_link_info),
0332               cmp_res);
0333
0334         close(link_fd);
0335     }
0336     CHECK(nr_id_found != nr_iters,
0337           "check total link id found by get_next_id",
0338           "nr_id_found %u(%u)\n", nr_id_found, nr_iters);
0339
0340 done:
0341     for (i = 0; i < nr_iters; i++) {
0342         bpf_link__destroy(links[i]);
0343         bpf_object__close(objs[i]);
0344     }
0345 }