// SPDX-License-Identifier: GPL-2.0 #include void test_bpf_obj_id(void) { const __u64 array_magic_value = 0xfaceb00c; const __u32 array_key = 0; const int nr_iters = 2; const char *file = "./test_obj_id.o"; const char *expected_prog_name = "test_obj_id"; const char *expected_map_name = "test_map_id"; const __u64 nsec_per_sec = 1000000000; struct bpf_object *objs[nr_iters]; int prog_fds[nr_iters], map_fds[nr_iters]; /* +1 to test for the info_len returned by kernel */ struct bpf_prog_info prog_infos[nr_iters + 1]; struct bpf_map_info map_infos[nr_iters + 1]; /* Each prog only uses one map. +1 to test nr_map_ids * returned by kernel. */ __u32 map_ids[nr_iters + 1]; char jited_insns[128], xlated_insns[128], zeros[128]; __u32 i, next_id, info_len, nr_id_found, duration = 0; struct timespec real_time_ts, boot_time_ts; int err = 0; __u64 array_value; uid_t my_uid = getuid(); time_t now, load_time; err = bpf_prog_get_fd_by_id(0); CHECK(err >= 0 || errno != ENOENT, "get-fd-by-notexist-prog-id", "err %d errno %d\n", err, errno); err = bpf_map_get_fd_by_id(0); CHECK(err >= 0 || errno != ENOENT, "get-fd-by-notexist-map-id", "err %d errno %d\n", err, errno); for (i = 0; i < nr_iters; i++) objs[i] = NULL; /* Check bpf_obj_get_info_by_fd() */ bzero(zeros, sizeof(zeros)); for (i = 0; i < nr_iters; i++) { now = time(NULL); err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER, &objs[i], &prog_fds[i]); /* test_obj_id.o is a dumb prog. It should never fail * to load. */ if (err) error_cnt++; assert(!err); /* Insert a magic value to the map */ map_fds[i] = bpf_find_map(__func__, objs[i], "test_map_id"); assert(map_fds[i] >= 0); err = bpf_map_update_elem(map_fds[i], &array_key, &array_magic_value, 0); assert(!err); /* Check getting map info */ info_len = sizeof(struct bpf_map_info) * 2; bzero(&map_infos[i], info_len); err = bpf_obj_get_info_by_fd(map_fds[i], &map_infos[i], &info_len); if (CHECK(err || map_infos[i].type != BPF_MAP_TYPE_ARRAY || map_infos[i].key_size != sizeof(__u32) || map_infos[i].value_size != sizeof(__u64) || map_infos[i].max_entries != 1 || map_infos[i].map_flags != 0 || info_len != sizeof(struct bpf_map_info) || strcmp((char *)map_infos[i].name, expected_map_name), "get-map-info(fd)", "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", err, errno, map_infos[i].type, BPF_MAP_TYPE_ARRAY, info_len, sizeof(struct bpf_map_info), map_infos[i].key_size, map_infos[i].value_size, map_infos[i].max_entries, map_infos[i].map_flags, map_infos[i].name, expected_map_name)) goto done; /* Check getting prog info */ info_len = sizeof(struct bpf_prog_info) * 2; bzero(&prog_infos[i], info_len); bzero(jited_insns, sizeof(jited_insns)); bzero(xlated_insns, sizeof(xlated_insns)); prog_infos[i].jited_prog_insns = ptr_to_u64(jited_insns); prog_infos[i].jited_prog_len = sizeof(jited_insns); prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns); prog_infos[i].xlated_prog_len = sizeof(xlated_insns); prog_infos[i].map_ids = ptr_to_u64(map_ids + i); prog_infos[i].nr_map_ids = 2; err = clock_gettime(CLOCK_REALTIME, &real_time_ts); assert(!err); err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts); assert(!err); err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i], &info_len); load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec) + (prog_infos[i].load_time / nsec_per_sec); if (CHECK(err || prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER || info_len != sizeof(struct bpf_prog_info) || (env.jit_enabled && !prog_infos[i].jited_prog_len) || (env.jit_enabled && !memcmp(jited_insns, zeros, sizeof(zeros))) || !prog_infos[i].xlated_prog_len || !memcmp(xlated_insns, zeros, sizeof(zeros)) || load_time < now - 60 || load_time > now + 60 || prog_infos[i].created_by_uid != my_uid || prog_infos[i].nr_map_ids != 1 || *(int *)(long)prog_infos[i].map_ids != map_infos[i].id || strcmp((char *)prog_infos[i].name, expected_prog_name), "get-prog-info(fd)", "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", err, errno, i, prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER, info_len, sizeof(struct bpf_prog_info), env.jit_enabled, prog_infos[i].jited_prog_len, prog_infos[i].xlated_prog_len, !!memcmp(jited_insns, zeros, sizeof(zeros)), !!memcmp(xlated_insns, zeros, sizeof(zeros)), load_time, now, prog_infos[i].created_by_uid, my_uid, prog_infos[i].nr_map_ids, 1, *(int *)(long)prog_infos[i].map_ids, map_infos[i].id, prog_infos[i].name, expected_prog_name)) goto done; } /* Check bpf_prog_get_next_id() */ nr_id_found = 0; next_id = 0; while (!bpf_prog_get_next_id(next_id, &next_id)) { struct bpf_prog_info prog_info = {}; __u32 saved_map_id; int prog_fd; info_len = sizeof(prog_info); prog_fd = bpf_prog_get_fd_by_id(next_id); if (prog_fd < 0 && errno == ENOENT) /* The bpf_prog is in the dead row */ continue; if (CHECK(prog_fd < 0, "get-prog-fd(next_id)", "prog_fd %d next_id %d errno %d\n", prog_fd, next_id, errno)) break; for (i = 0; i < nr_iters; i++) if (prog_infos[i].id == next_id) break; if (i == nr_iters) continue; nr_id_found++; /* Negative test: * prog_info.nr_map_ids = 1 * prog_info.map_ids = NULL */ prog_info.nr_map_ids = 1; err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len); if (CHECK(!err || errno != EFAULT, "get-prog-fd-bad-nr-map-ids", "err %d errno %d(%d)", err, errno, EFAULT)) break; bzero(&prog_info, sizeof(prog_info)); info_len = sizeof(prog_info); saved_map_id = *(int *)((long)prog_infos[i].map_ids); prog_info.map_ids = prog_infos[i].map_ids; prog_info.nr_map_ids = 2; err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len); prog_infos[i].jited_prog_insns = 0; prog_infos[i].xlated_prog_insns = 0; CHECK(err || info_len != sizeof(struct bpf_prog_info) || memcmp(&prog_info, &prog_infos[i], info_len) || *(int *)(long)prog_info.map_ids != saved_map_id, "get-prog-info(next_id->fd)", "err %d errno %d info_len %u(%zu) memcmp %d map_id %u(%u)\n", err, errno, info_len, sizeof(struct bpf_prog_info), memcmp(&prog_info, &prog_infos[i], info_len), *(int *)(long)prog_info.map_ids, saved_map_id); close(prog_fd); } CHECK(nr_id_found != nr_iters, "check total prog id found by get_next_id", "nr_id_found %u(%u)\n", nr_id_found, nr_iters); /* Check bpf_map_get_next_id() */ nr_id_found = 0; next_id = 0; while (!bpf_map_get_next_id(next_id, &next_id)) { struct bpf_map_info map_info = {}; int map_fd; info_len = sizeof(map_info); map_fd = bpf_map_get_fd_by_id(next_id); if (map_fd < 0 && errno == ENOENT) /* The bpf_map is in the dead row */ continue; if (CHECK(map_fd < 0, "get-map-fd(next_id)", "map_fd %d next_id %u errno %d\n", map_fd, next_id, errno)) break; for (i = 0; i < nr_iters; i++) if (map_infos[i].id == next_id) break; if (i == nr_iters) continue; nr_id_found++; err = bpf_map_lookup_elem(map_fd, &array_key, &array_value); assert(!err); err = bpf_obj_get_info_by_fd(map_fd, &map_info, &info_len); CHECK(err || info_len != sizeof(struct bpf_map_info) || memcmp(&map_info, &map_infos[i], info_len) || array_value != array_magic_value, "check get-map-info(next_id->fd)", "err %d errno %d info_len %u(%zu) memcmp %d array_value %llu(%llu)\n", err, errno, info_len, sizeof(struct bpf_map_info), memcmp(&map_info, &map_infos[i], info_len), array_value, array_magic_value); close(map_fd); } CHECK(nr_id_found != nr_iters, "check total map id found by get_next_id", "nr_id_found %u(%u)\n", nr_id_found, nr_iters); done: for (i = 0; i < nr_iters; i++) bpf_object__close(objs[i]); }