/* Copyright (c) 2017 Facebook * * This program is free software; you can redistribute it and/or * modify it under the terms of version 2 of the GNU General Public * License as published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include typedef __u16 __sum16; #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "test_iptunnel_common.h" #include "bpf_util.h" #include "bpf_endian.h" #include "bpf_rlimit.h" #include "trace_helpers.h" static int error_cnt, pass_cnt; static bool jit_enabled; #define MAGIC_BYTES 123 /* ipv4 test vector */ static struct { struct ethhdr eth; struct iphdr iph; struct tcphdr tcp; } __packed pkt_v4 = { .eth.h_proto = __bpf_constant_htons(ETH_P_IP), .iph.ihl = 5, .iph.protocol = 6, .iph.tot_len = __bpf_constant_htons(MAGIC_BYTES), .tcp.urg_ptr = 123, }; /* ipv6 test vector */ static struct { struct ethhdr eth; struct ipv6hdr iph; struct tcphdr tcp; } __packed pkt_v6 = { .eth.h_proto = __bpf_constant_htons(ETH_P_IPV6), .iph.nexthdr = 6, .iph.payload_len = __bpf_constant_htons(MAGIC_BYTES), .tcp.urg_ptr = 123, }; #define CHECK(condition, tag, format...) ({ \ int __ret = !!(condition); \ if (__ret) { \ error_cnt++; \ printf("%s:FAIL:%s ", __func__, tag); \ printf(format); \ } else { \ pass_cnt++; \ printf("%s:PASS:%s %d nsec\n", __func__, tag, duration);\ } \ __ret; \ }) static int bpf_find_map(const char *test, struct bpf_object *obj, const char *name) { struct bpf_map *map; map = bpf_object__find_map_by_name(obj, name); if (!map) { printf("%s:FAIL:map '%s' not found\n", test, name); error_cnt++; return -1; } return bpf_map__fd(map); } static void test_pkt_access(void) { const char *file = "./test_pkt_access.o"; struct bpf_object *obj; __u32 duration, retval; int err, prog_fd; err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd); if (err) { error_cnt++; return; } err = bpf_prog_test_run(prog_fd, 100000, &pkt_v4, sizeof(pkt_v4), NULL, NULL, &retval, &duration); CHECK(err || errno || retval, "ipv4", "err %d errno %d retval %d duration %d\n", err, errno, retval, duration); err = bpf_prog_test_run(prog_fd, 100000, &pkt_v6, sizeof(pkt_v6), NULL, NULL, &retval, &duration); CHECK(err || errno || retval, "ipv6", "err %d errno %d retval %d duration %d\n", err, errno, retval, duration); bpf_object__close(obj); } static void test_xdp(void) { struct vip key4 = {.protocol = 6, .family = AF_INET}; struct vip key6 = {.protocol = 6, .family = AF_INET6}; struct iptnl_info value4 = {.family = AF_INET}; struct iptnl_info value6 = {.family = AF_INET6}; const char *file = "./test_xdp.o"; struct bpf_object *obj; char buf[128]; struct ipv6hdr *iph6 = (void *)buf + sizeof(struct ethhdr); struct iphdr *iph = (void *)buf + sizeof(struct ethhdr); __u32 duration, retval, size; int err, prog_fd, map_fd; err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); if (err) { error_cnt++; return; } map_fd = bpf_find_map(__func__, obj, "vip2tnl"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &key4, &value4, 0); bpf_map_update_elem(map_fd, &key6, &value6, 0); err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4), buf, &size, &retval, &duration); CHECK(err || errno || retval != XDP_TX || size != 74 || iph->protocol != IPPROTO_IPIP, "ipv4", "err %d errno %d retval %d size %d\n", err, errno, retval, size); err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6), buf, &size, &retval, &duration); CHECK(err || errno || retval != XDP_TX || size != 114 || iph6->nexthdr != IPPROTO_IPV6, "ipv6", "err %d errno %d retval %d size %d\n", err, errno, retval, size); out: bpf_object__close(obj); } static void test_xdp_adjust_tail(void) { const char *file = "./test_adjust_tail.o"; struct bpf_object *obj; char buf[128]; __u32 duration, retval, size; int err, prog_fd; err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); if (err) { error_cnt++; return; } err = bpf_prog_test_run(prog_fd, 1, &pkt_v4, sizeof(pkt_v4), buf, &size, &retval, &duration); CHECK(err || errno || retval != XDP_DROP, "ipv4", "err %d errno %d retval %d size %d\n", err, errno, retval, size); err = bpf_prog_test_run(prog_fd, 1, &pkt_v6, sizeof(pkt_v6), buf, &size, &retval, &duration); CHECK(err || errno || retval != XDP_TX || size != 54, "ipv6", "err %d errno %d retval %d size %d\n", err, errno, retval, size); bpf_object__close(obj); } #define MAGIC_VAL 0x1234 #define NUM_ITER 100000 #define VIP_NUM 5 static void test_l4lb(const char *file) { unsigned int nr_cpus = bpf_num_possible_cpus(); struct vip key = {.protocol = 6}; struct vip_meta { __u32 flags; __u32 vip_num; } value = {.vip_num = VIP_NUM}; __u32 stats_key = VIP_NUM; struct vip_stats { __u64 bytes; __u64 pkts; } stats[nr_cpus]; struct real_definition { union { __be32 dst; __be32 dstv6[4]; }; __u8 flags; } real_def = {.dst = MAGIC_VAL}; __u32 ch_key = 11, real_num = 3; __u32 duration, retval, size; int err, i, prog_fd, map_fd; __u64 bytes = 0, pkts = 0; struct bpf_object *obj; char buf[128]; u32 *magic = (u32 *)buf; err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd); if (err) { error_cnt++; return; } map_fd = bpf_find_map(__func__, obj, "vip_map"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &key, &value, 0); map_fd = bpf_find_map(__func__, obj, "ch_rings"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &ch_key, &real_num, 0); map_fd = bpf_find_map(__func__, obj, "reals"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &real_num, &real_def, 0); err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4), buf, &size, &retval, &duration); CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 54 || *magic != MAGIC_VAL, "ipv4", "err %d errno %d retval %d size %d magic %x\n", err, errno, retval, size, *magic); err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6), buf, &size, &retval, &duration); CHECK(err || errno || retval != 7/*TC_ACT_REDIRECT*/ || size != 74 || *magic != MAGIC_VAL, "ipv6", "err %d errno %d retval %d size %d magic %x\n", err, errno, retval, size, *magic); map_fd = bpf_find_map(__func__, obj, "stats"); if (map_fd < 0) goto out; bpf_map_lookup_elem(map_fd, &stats_key, stats); for (i = 0; i < nr_cpus; i++) { bytes += stats[i].bytes; pkts += stats[i].pkts; } if (bytes != MAGIC_BYTES * NUM_ITER * 2 || pkts != NUM_ITER * 2) { error_cnt++; printf("test_l4lb:FAIL:stats %lld %lld\n", bytes, pkts); } out: bpf_object__close(obj); } static void test_l4lb_all(void) { const char *file1 = "./test_l4lb.o"; const char *file2 = "./test_l4lb_noinline.o"; test_l4lb(file1); test_l4lb(file2); } static void test_xdp_noinline(void) { const char *file = "./test_xdp_noinline.o"; unsigned int nr_cpus = bpf_num_possible_cpus(); struct vip key = {.protocol = 6}; struct vip_meta { __u32 flags; __u32 vip_num; } value = {.vip_num = VIP_NUM}; __u32 stats_key = VIP_NUM; struct vip_stats { __u64 bytes; __u64 pkts; } stats[nr_cpus]; struct real_definition { union { __be32 dst; __be32 dstv6[4]; }; __u8 flags; } real_def = {.dst = MAGIC_VAL}; __u32 ch_key = 11, real_num = 3; __u32 duration, retval, size; int err, i, prog_fd, map_fd; __u64 bytes = 0, pkts = 0; struct bpf_object *obj; char buf[128]; u32 *magic = (u32 *)buf; err = bpf_prog_load(file, BPF_PROG_TYPE_XDP, &obj, &prog_fd); if (err) { error_cnt++; return; } map_fd = bpf_find_map(__func__, obj, "vip_map"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &key, &value, 0); map_fd = bpf_find_map(__func__, obj, "ch_rings"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &ch_key, &real_num, 0); map_fd = bpf_find_map(__func__, obj, "reals"); if (map_fd < 0) goto out; bpf_map_update_elem(map_fd, &real_num, &real_def, 0); err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v4, sizeof(pkt_v4), buf, &size, &retval, &duration); CHECK(err || errno || retval != 1 || size != 54 || *magic != MAGIC_VAL, "ipv4", "err %d errno %d retval %d size %d magic %x\n", err, errno, retval, size, *magic); err = bpf_prog_test_run(prog_fd, NUM_ITER, &pkt_v6, sizeof(pkt_v6), buf, &size, &retval, &duration); CHECK(err || errno || retval != 1 || size != 74 || *magic != MAGIC_VAL, "ipv6", "err %d errno %d retval %d size %d magic %x\n", err, errno, retval, size, *magic); map_fd = bpf_find_map(__func__, obj, "stats"); if (map_fd < 0) goto out; bpf_map_lookup_elem(map_fd, &stats_key, stats); for (i = 0; i < nr_cpus; i++) { bytes += stats[i].bytes; pkts += stats[i].pkts; } if (bytes != MAGIC_BYTES * NUM_ITER * 2 || pkts != NUM_ITER * 2) { error_cnt++; printf("test_xdp_noinline:FAIL:stats %lld %lld\n", bytes, pkts); } out: bpf_object__close(obj); } static void test_tcp_estats(void) { const char *file = "./test_tcp_estats.o"; int err, prog_fd; struct bpf_object *obj; __u32 duration = 0; err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); CHECK(err, "", "err %d errno %d\n", err, errno); if (err) { error_cnt++; return; } bpf_object__close(obj); } static inline __u64 ptr_to_u64(const void *ptr) { return (__u64) (unsigned long) ptr; } static bool is_jit_enabled(void) { const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable"; bool enabled = false; int sysctl_fd; sysctl_fd = open(jit_sysctl, 0, O_RDONLY); if (sysctl_fd != -1) { char tmpc; if (read(sysctl_fd, &tmpc, sizeof(tmpc)) == 1) enabled = (tmpc != '0'); close(sysctl_fd); } return enabled; } static 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) || (jit_enabled && !prog_infos[i].jited_prog_len) || (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 *)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), 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 *)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 *)(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 *)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 *)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]); } static void test_pkt_md_access(void) { const char *file = "./test_pkt_md_access.o"; struct bpf_object *obj; __u32 duration, retval; int err, prog_fd; err = bpf_prog_load(file, BPF_PROG_TYPE_SCHED_CLS, &obj, &prog_fd); if (err) { error_cnt++; return; } err = bpf_prog_test_run(prog_fd, 10, &pkt_v4, sizeof(pkt_v4), NULL, NULL, &retval, &duration); CHECK(err || retval, "", "err %d errno %d retval %d duration %d\n", err, errno, retval, duration); bpf_object__close(obj); } static void test_obj_name(void) { struct { const char *name; int success; int expected_errno; } tests[] = { { "", 1, 0 }, { "_123456789ABCDE", 1, 0 }, { "_123456789ABCDEF", 0, EINVAL }, { "_123456789ABCD\n", 0, EINVAL }, }; struct bpf_insn prog[] = { BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0), BPF_EXIT_INSN(), }; __u32 duration = 0; int i; for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) { size_t name_len = strlen(tests[i].name) + 1; union bpf_attr attr; size_t ncopy; int fd; /* test different attr.prog_name during BPF_PROG_LOAD */ ncopy = name_len < sizeof(attr.prog_name) ? name_len : sizeof(attr.prog_name); bzero(&attr, sizeof(attr)); attr.prog_type = BPF_PROG_TYPE_SCHED_CLS; attr.insn_cnt = 2; attr.insns = ptr_to_u64(prog); attr.license = ptr_to_u64(""); memcpy(attr.prog_name, tests[i].name, ncopy); fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr)); CHECK((tests[i].success && fd < 0) || (!tests[i].success && fd != -1) || (!tests[i].success && errno != tests[i].expected_errno), "check-bpf-prog-name", "fd %d(%d) errno %d(%d)\n", fd, tests[i].success, errno, tests[i].expected_errno); if (fd != -1) close(fd); /* test different attr.map_name during BPF_MAP_CREATE */ ncopy = name_len < sizeof(attr.map_name) ? name_len : sizeof(attr.map_name); bzero(&attr, sizeof(attr)); attr.map_type = BPF_MAP_TYPE_ARRAY; attr.key_size = 4; attr.value_size = 4; attr.max_entries = 1; attr.map_flags = 0; memcpy(attr.map_name, tests[i].name, ncopy); fd = syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr)); CHECK((tests[i].success && fd < 0) || (!tests[i].success && fd != -1) || (!tests[i].success && errno != tests[i].expected_errno), "check-bpf-map-name", "fd %d(%d) errno %d(%d)\n", fd, tests[i].success, errno, tests[i].expected_errno); if (fd != -1) close(fd); } } static void test_tp_attach_query(void) { const int num_progs = 3; int i, j, bytes, efd, err, prog_fd[num_progs], pmu_fd[num_progs]; __u32 duration = 0, info_len, saved_prog_ids[num_progs]; const char *file = "./test_tracepoint.o"; struct perf_event_query_bpf *query; struct perf_event_attr attr = {}; struct bpf_object *obj[num_progs]; struct bpf_prog_info prog_info; char buf[256]; snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/sched/sched_switch/id"); efd = open(buf, O_RDONLY, 0); if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) return; bytes = read(efd, buf, sizeof(buf)); close(efd); if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read", "bytes %d errno %d\n", bytes, errno)) return; attr.config = strtol(buf, NULL, 0); attr.type = PERF_TYPE_TRACEPOINT; attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN; attr.sample_period = 1; attr.wakeup_events = 1; query = malloc(sizeof(*query) + sizeof(__u32) * num_progs); for (i = 0; i < num_progs; i++) { err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj[i], &prog_fd[i]); if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) goto cleanup1; bzero(&prog_info, sizeof(prog_info)); prog_info.jited_prog_len = 0; prog_info.xlated_prog_len = 0; prog_info.nr_map_ids = 0; info_len = sizeof(prog_info); err = bpf_obj_get_info_by_fd(prog_fd[i], &prog_info, &info_len); if (CHECK(err, "bpf_obj_get_info_by_fd", "err %d errno %d\n", err, errno)) goto cleanup1; saved_prog_ids[i] = prog_info.id; pmu_fd[i] = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */, -1 /* group id */, 0 /* flags */); if (CHECK(pmu_fd[i] < 0, "perf_event_open", "err %d errno %d\n", pmu_fd[i], errno)) goto cleanup2; err = ioctl(pmu_fd[i], PERF_EVENT_IOC_ENABLE, 0); if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err, errno)) goto cleanup3; if (i == 0) { /* check NULL prog array query */ query->ids_len = num_progs; err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); if (CHECK(err || query->prog_cnt != 0, "perf_event_ioc_query_bpf", "err %d errno %d query->prog_cnt %u\n", err, errno, query->prog_cnt)) goto cleanup3; } err = ioctl(pmu_fd[i], PERF_EVENT_IOC_SET_BPF, prog_fd[i]); if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err, errno)) goto cleanup3; if (i == 1) { /* try to get # of programs only */ query->ids_len = 0; err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); if (CHECK(err || query->prog_cnt != 2, "perf_event_ioc_query_bpf", "err %d errno %d query->prog_cnt %u\n", err, errno, query->prog_cnt)) goto cleanup3; /* try a few negative tests */ /* invalid query pointer */ err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, (struct perf_event_query_bpf *)0x1); if (CHECK(!err || errno != EFAULT, "perf_event_ioc_query_bpf", "err %d errno %d\n", err, errno)) goto cleanup3; /* no enough space */ query->ids_len = 1; err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); if (CHECK(!err || errno != ENOSPC || query->prog_cnt != 2, "perf_event_ioc_query_bpf", "err %d errno %d query->prog_cnt %u\n", err, errno, query->prog_cnt)) goto cleanup3; } query->ids_len = num_progs; err = ioctl(pmu_fd[i], PERF_EVENT_IOC_QUERY_BPF, query); if (CHECK(err || query->prog_cnt != (i + 1), "perf_event_ioc_query_bpf", "err %d errno %d query->prog_cnt %u\n", err, errno, query->prog_cnt)) goto cleanup3; for (j = 0; j < i + 1; j++) if (CHECK(saved_prog_ids[j] != query->ids[j], "perf_event_ioc_query_bpf", "#%d saved_prog_id %x query prog_id %x\n", j, saved_prog_ids[j], query->ids[j])) goto cleanup3; } i = num_progs - 1; for (; i >= 0; i--) { cleanup3: ioctl(pmu_fd[i], PERF_EVENT_IOC_DISABLE); cleanup2: close(pmu_fd[i]); cleanup1: bpf_object__close(obj[i]); } free(query); } static int compare_map_keys(int map1_fd, int map2_fd) { __u32 key, next_key; char val_buf[PERF_MAX_STACK_DEPTH * sizeof(struct bpf_stack_build_id)]; int err; err = bpf_map_get_next_key(map1_fd, NULL, &key); if (err) return err; err = bpf_map_lookup_elem(map2_fd, &key, val_buf); if (err) return err; while (bpf_map_get_next_key(map1_fd, &key, &next_key) == 0) { err = bpf_map_lookup_elem(map2_fd, &next_key, val_buf); if (err) return err; key = next_key; } if (errno != ENOENT) return -1; return 0; } static int compare_stack_ips(int smap_fd, int amap_fd, int stack_trace_len) { __u32 key, next_key, *cur_key_p, *next_key_p; char *val_buf1, *val_buf2; int i, err = 0; val_buf1 = malloc(stack_trace_len); val_buf2 = malloc(stack_trace_len); cur_key_p = NULL; next_key_p = &key; while (bpf_map_get_next_key(smap_fd, cur_key_p, next_key_p) == 0) { err = bpf_map_lookup_elem(smap_fd, next_key_p, val_buf1); if (err) goto out; err = bpf_map_lookup_elem(amap_fd, next_key_p, val_buf2); if (err) goto out; for (i = 0; i < stack_trace_len; i++) { if (val_buf1[i] != val_buf2[i]) { err = -1; goto out; } } key = *next_key_p; cur_key_p = &key; next_key_p = &next_key; } if (errno != ENOENT) err = -1; out: free(val_buf1); free(val_buf2); return err; } static void test_stacktrace_map() { int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd; const char *file = "./test_stacktrace_map.o"; int bytes, efd, err, pmu_fd, prog_fd, stack_trace_len; struct perf_event_attr attr = {}; __u32 key, val, duration = 0; struct bpf_object *obj; char buf[256]; err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) return; /* Get the ID for the sched/sched_switch tracepoint */ snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/sched/sched_switch/id"); efd = open(buf, O_RDONLY, 0); if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) goto close_prog; bytes = read(efd, buf, sizeof(buf)); close(efd); if (bytes <= 0 || bytes >= sizeof(buf)) goto close_prog; /* Open the perf event and attach bpf progrram */ attr.config = strtol(buf, NULL, 0); attr.type = PERF_TYPE_TRACEPOINT; attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN; attr.sample_period = 1; attr.wakeup_events = 1; pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */, -1 /* group id */, 0 /* flags */); if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd, errno)) goto close_prog; err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); if (err) goto disable_pmu; err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); if (err) goto disable_pmu; /* find map fds */ control_map_fd = bpf_find_map(__func__, obj, "control_map"); if (control_map_fd < 0) goto disable_pmu; stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap"); if (stackid_hmap_fd < 0) goto disable_pmu; stackmap_fd = bpf_find_map(__func__, obj, "stackmap"); if (stackmap_fd < 0) goto disable_pmu; stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap"); if (stack_amap_fd < 0) goto disable_pmu; /* give some time for bpf program run */ sleep(1); /* disable stack trace collection */ key = 0; val = 1; bpf_map_update_elem(control_map_fd, &key, &val, 0); /* for every element in stackid_hmap, we can find a corresponding one * in stackmap, and vise versa. */ err = compare_map_keys(stackid_hmap_fd, stackmap_fd); if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap", "err %d errno %d\n", err, errno)) goto disable_pmu_noerr; err = compare_map_keys(stackmap_fd, stackid_hmap_fd); if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap", "err %d errno %d\n", err, errno)) goto disable_pmu_noerr; stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(__u64); err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len); if (CHECK(err, "compare_stack_ips stackmap vs. stack_amap", "err %d errno %d\n", err, errno)) goto disable_pmu_noerr; goto disable_pmu_noerr; disable_pmu: error_cnt++; disable_pmu_noerr: ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); close(pmu_fd); close_prog: bpf_object__close(obj); } static void test_stacktrace_map_raw_tp() { int control_map_fd, stackid_hmap_fd, stackmap_fd; const char *file = "./test_stacktrace_map.o"; int efd, err, prog_fd; __u32 key, val, duration = 0; struct bpf_object *obj; err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno)) return; efd = bpf_raw_tracepoint_open("sched_switch", prog_fd); if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno)) goto close_prog; /* find map fds */ control_map_fd = bpf_find_map(__func__, obj, "control_map"); if (control_map_fd < 0) goto close_prog; stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap"); if (stackid_hmap_fd < 0) goto close_prog; stackmap_fd = bpf_find_map(__func__, obj, "stackmap"); if (stackmap_fd < 0) goto close_prog; /* give some time for bpf program run */ sleep(1); /* disable stack trace collection */ key = 0; val = 1; bpf_map_update_elem(control_map_fd, &key, &val, 0); /* for every element in stackid_hmap, we can find a corresponding one * in stackmap, and vise versa. */ err = compare_map_keys(stackid_hmap_fd, stackmap_fd); if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap", "err %d errno %d\n", err, errno)) goto close_prog; err = compare_map_keys(stackmap_fd, stackid_hmap_fd); if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap", "err %d errno %d\n", err, errno)) goto close_prog; goto close_prog_noerr; close_prog: error_cnt++; close_prog_noerr: bpf_object__close(obj); } static int extract_build_id(char *build_id, size_t size) { FILE *fp; char *line = NULL; size_t len = 0; fp = popen("readelf -n ./urandom_read | grep 'Build ID'", "r"); if (fp == NULL) return -1; if (getline(&line, &len, fp) == -1) goto err; pclose(fp); if (len > size) len = size; memcpy(build_id, line, len); build_id[len] = '\0'; free(line); return 0; err: pclose(fp); return -1; } static void test_stacktrace_build_id(void) { int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd; const char *file = "./test_stacktrace_build_id.o"; int bytes, efd, err, pmu_fd, prog_fd, stack_trace_len; struct perf_event_attr attr = {}; __u32 key, previous_key, val, duration = 0; struct bpf_object *obj; char buf[256]; int i, j; struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH]; int build_id_matches = 0; int retry = 1; retry: err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) goto out; /* Get the ID for the sched/sched_switch tracepoint */ snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/random/urandom_read/id"); efd = open(buf, O_RDONLY, 0); if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) goto close_prog; bytes = read(efd, buf, sizeof(buf)); close(efd); if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read", "bytes %d errno %d\n", bytes, errno)) goto close_prog; /* Open the perf event and attach bpf progrram */ attr.config = strtol(buf, NULL, 0); attr.type = PERF_TYPE_TRACEPOINT; attr.sample_type = PERF_SAMPLE_RAW | PERF_SAMPLE_CALLCHAIN; attr.sample_period = 1; attr.wakeup_events = 1; pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */, -1 /* group id */, 0 /* flags */); if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd, errno)) goto close_prog; err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err, errno)) goto close_pmu; err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err, errno)) goto disable_pmu; /* find map fds */ control_map_fd = bpf_find_map(__func__, obj, "control_map"); if (CHECK(control_map_fd < 0, "bpf_find_map control_map", "err %d errno %d\n", err, errno)) goto disable_pmu; stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap"); if (CHECK(stackid_hmap_fd < 0, "bpf_find_map stackid_hmap", "err %d errno %d\n", err, errno)) goto disable_pmu; stackmap_fd = bpf_find_map(__func__, obj, "stackmap"); if (CHECK(stackmap_fd < 0, "bpf_find_map stackmap", "err %d errno %d\n", err, errno)) goto disable_pmu; stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap"); if (CHECK(stack_amap_fd < 0, "bpf_find_map stack_amap", "err %d errno %d\n", err, errno)) goto disable_pmu; assert(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null") == 0); assert(system("./urandom_read") == 0); /* disable stack trace collection */ key = 0; val = 1; bpf_map_update_elem(control_map_fd, &key, &val, 0); /* for every element in stackid_hmap, we can find a corresponding one * in stackmap, and vise versa. */ err = compare_map_keys(stackid_hmap_fd, stackmap_fd); if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap", "err %d errno %d\n", err, errno)) goto disable_pmu; err = compare_map_keys(stackmap_fd, stackid_hmap_fd); if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap", "err %d errno %d\n", err, errno)) goto disable_pmu; err = extract_build_id(buf, 256); if (CHECK(err, "get build_id with readelf", "err %d errno %d\n", err, errno)) goto disable_pmu; err = bpf_map_get_next_key(stackmap_fd, NULL, &key); if (CHECK(err, "get_next_key from stackmap", "err %d, errno %d\n", err, errno)) goto disable_pmu; do { char build_id[64]; err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs); if (CHECK(err, "lookup_elem from stackmap", "err %d, errno %d\n", err, errno)) goto disable_pmu; for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i) if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID && id_offs[i].offset != 0) { for (j = 0; j < 20; ++j) sprintf(build_id + 2 * j, "%02x", id_offs[i].build_id[j] & 0xff); if (strstr(buf, build_id) != NULL) build_id_matches = 1; } previous_key = key; } while (bpf_map_get_next_key(stackmap_fd, &previous_key, &key) == 0); /* stack_map_get_build_id_offset() is racy and sometimes can return * BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID; * try it one more time. */ if (build_id_matches < 1 && retry--) { ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); close(pmu_fd); bpf_object__close(obj); printf("%s:WARN:Didn't find expected build ID from the map, retrying\n", __func__); goto retry; } if (CHECK(build_id_matches < 1, "build id match", "Didn't find expected build ID from the map\n")) goto disable_pmu; stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(struct bpf_stack_build_id); err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len); CHECK(err, "compare_stack_ips stackmap vs. stack_amap", "err %d errno %d\n", err, errno); disable_pmu: ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); close_pmu: close(pmu_fd); close_prog: bpf_object__close(obj); out: return; } static void test_stacktrace_build_id_nmi(void) { int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd; const char *file = "./test_stacktrace_build_id.o"; int err, pmu_fd, prog_fd; struct perf_event_attr attr = { .sample_freq = 5000, .freq = 1, .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_CPU_CYCLES, }; __u32 key, previous_key, val, duration = 0; struct bpf_object *obj; char buf[256]; int i, j; struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH]; int build_id_matches = 0; int retry = 1; retry: err = bpf_prog_load(file, BPF_PROG_TYPE_PERF_EVENT, &obj, &prog_fd); if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno)) return; pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */, -1 /* group id */, 0 /* flags */); if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d. Does the test host support PERF_COUNT_HW_CPU_CYCLES?\n", pmu_fd, errno)) goto close_prog; err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err, errno)) goto close_pmu; err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err, errno)) goto disable_pmu; /* find map fds */ control_map_fd = bpf_find_map(__func__, obj, "control_map"); if (CHECK(control_map_fd < 0, "bpf_find_map control_map", "err %d errno %d\n", err, errno)) goto disable_pmu; stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap"); if (CHECK(stackid_hmap_fd < 0, "bpf_find_map stackid_hmap", "err %d errno %d\n", err, errno)) goto disable_pmu; stackmap_fd = bpf_find_map(__func__, obj, "stackmap"); if (CHECK(stackmap_fd < 0, "bpf_find_map stackmap", "err %d errno %d\n", err, errno)) goto disable_pmu; stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap"); if (CHECK(stack_amap_fd < 0, "bpf_find_map stack_amap", "err %d errno %d\n", err, errno)) goto disable_pmu; assert(system("dd if=/dev/urandom of=/dev/zero count=4 2> /dev/null") == 0); assert(system("taskset 0x1 ./urandom_read 100000") == 0); /* disable stack trace collection */ key = 0; val = 1; bpf_map_update_elem(control_map_fd, &key, &val, 0); /* for every element in stackid_hmap, we can find a corresponding one * in stackmap, and vise versa. */ err = compare_map_keys(stackid_hmap_fd, stackmap_fd); if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap", "err %d errno %d\n", err, errno)) goto disable_pmu; err = compare_map_keys(stackmap_fd, stackid_hmap_fd); if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap", "err %d errno %d\n", err, errno)) goto disable_pmu; err = extract_build_id(buf, 256); if (CHECK(err, "get build_id with readelf", "err %d errno %d\n", err, errno)) goto disable_pmu; err = bpf_map_get_next_key(stackmap_fd, NULL, &key); if (CHECK(err, "get_next_key from stackmap", "err %d, errno %d\n", err, errno)) goto disable_pmu; do { char build_id[64]; err = bpf_map_lookup_elem(stackmap_fd, &key, id_offs); if (CHECK(err, "lookup_elem from stackmap", "err %d, errno %d\n", err, errno)) goto disable_pmu; for (i = 0; i < PERF_MAX_STACK_DEPTH; ++i) if (id_offs[i].status == BPF_STACK_BUILD_ID_VALID && id_offs[i].offset != 0) { for (j = 0; j < 20; ++j) sprintf(build_id + 2 * j, "%02x", id_offs[i].build_id[j] & 0xff); if (strstr(buf, build_id) != NULL) build_id_matches = 1; } previous_key = key; } while (bpf_map_get_next_key(stackmap_fd, &previous_key, &key) == 0); /* stack_map_get_build_id_offset() is racy and sometimes can return * BPF_STACK_BUILD_ID_IP instead of BPF_STACK_BUILD_ID_VALID; * try it one more time. */ if (build_id_matches < 1 && retry--) { ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); close(pmu_fd); bpf_object__close(obj); printf("%s:WARN:Didn't find expected build ID from the map, retrying\n", __func__); goto retry; } if (CHECK(build_id_matches < 1, "build id match", "Didn't find expected build ID from the map\n")) goto disable_pmu; /* * We intentionally skip compare_stack_ips(). This is because we * only support one in_nmi() ips-to-build_id translation per cpu * at any time, thus stack_amap here will always fallback to * BPF_STACK_BUILD_ID_IP; */ disable_pmu: ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE); close_pmu: close(pmu_fd); close_prog: bpf_object__close(obj); } #define MAX_CNT_RAWTP 10ull #define MAX_STACK_RAWTP 100 struct get_stack_trace_t { int pid; int kern_stack_size; int user_stack_size; int user_stack_buildid_size; __u64 kern_stack[MAX_STACK_RAWTP]; __u64 user_stack[MAX_STACK_RAWTP]; struct bpf_stack_build_id user_stack_buildid[MAX_STACK_RAWTP]; }; static int get_stack_print_output(void *data, int size) { bool good_kern_stack = false, good_user_stack = false; const char *nonjit_func = "___bpf_prog_run"; struct get_stack_trace_t *e = data; int i, num_stack; static __u64 cnt; struct ksym *ks; cnt++; if (size < sizeof(struct get_stack_trace_t)) { __u64 *raw_data = data; bool found = false; num_stack = size / sizeof(__u64); /* If jit is enabled, we do not have a good way to * verify the sanity of the kernel stack. So we * just assume it is good if the stack is not empty. * This could be improved in the future. */ if (jit_enabled) { found = num_stack > 0; } else { for (i = 0; i < num_stack; i++) { ks = ksym_search(raw_data[i]); if (strcmp(ks->name, nonjit_func) == 0) { found = true; break; } } } if (found) { good_kern_stack = true; good_user_stack = true; } } else { num_stack = e->kern_stack_size / sizeof(__u64); if (jit_enabled) { good_kern_stack = num_stack > 0; } else { for (i = 0; i < num_stack; i++) { ks = ksym_search(e->kern_stack[i]); if (strcmp(ks->name, nonjit_func) == 0) { good_kern_stack = true; break; } } } if (e->user_stack_size > 0 && e->user_stack_buildid_size > 0) good_user_stack = true; } if (!good_kern_stack || !good_user_stack) return LIBBPF_PERF_EVENT_ERROR; if (cnt == MAX_CNT_RAWTP) return LIBBPF_PERF_EVENT_DONE; return LIBBPF_PERF_EVENT_CONT; } static void test_get_stack_raw_tp(void) { const char *file = "./test_get_stack_rawtp.o"; int i, efd, err, prog_fd, pmu_fd, perfmap_fd; struct perf_event_attr attr = {}; struct timespec tv = {0, 10}; __u32 key = 0, duration = 0; struct bpf_object *obj; err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno)) return; efd = bpf_raw_tracepoint_open("sys_enter", prog_fd); if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno)) goto close_prog; perfmap_fd = bpf_find_map(__func__, obj, "perfmap"); if (CHECK(perfmap_fd < 0, "bpf_find_map", "err %d errno %d\n", perfmap_fd, errno)) goto close_prog; err = load_kallsyms(); if (CHECK(err < 0, "load_kallsyms", "err %d errno %d\n", err, errno)) goto close_prog; attr.sample_type = PERF_SAMPLE_RAW; attr.type = PERF_TYPE_SOFTWARE; attr.config = PERF_COUNT_SW_BPF_OUTPUT; pmu_fd = syscall(__NR_perf_event_open, &attr, getpid()/*pid*/, -1/*cpu*/, -1/*group_fd*/, 0); if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n", pmu_fd, errno)) goto close_prog; err = bpf_map_update_elem(perfmap_fd, &key, &pmu_fd, BPF_ANY); if (CHECK(err < 0, "bpf_map_update_elem", "err %d errno %d\n", err, errno)) goto close_prog; err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); if (CHECK(err < 0, "ioctl PERF_EVENT_IOC_ENABLE", "err %d errno %d\n", err, errno)) goto close_prog; err = perf_event_mmap(pmu_fd); if (CHECK(err < 0, "perf_event_mmap", "err %d errno %d\n", err, errno)) goto close_prog; /* trigger some syscall action */ for (i = 0; i < MAX_CNT_RAWTP; i++) nanosleep(&tv, NULL); err = perf_event_poller(pmu_fd, get_stack_print_output); if (CHECK(err < 0, "perf_event_poller", "err %d errno %d\n", err, errno)) goto close_prog; goto close_prog_noerr; close_prog: error_cnt++; close_prog_noerr: bpf_object__close(obj); } static void test_task_fd_query_rawtp(void) { const char *file = "./test_get_stack_rawtp.o"; __u64 probe_offset, probe_addr; __u32 len, prog_id, fd_type; struct bpf_object *obj; int efd, err, prog_fd; __u32 duration = 0; char buf[256]; err = bpf_prog_load(file, BPF_PROG_TYPE_RAW_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "prog_load raw tp", "err %d errno %d\n", err, errno)) return; efd = bpf_raw_tracepoint_open("sys_enter", prog_fd); if (CHECK(efd < 0, "raw_tp_open", "err %d errno %d\n", efd, errno)) goto close_prog; /* query (getpid(), efd) */ len = sizeof(buf); err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id, &fd_type, &probe_offset, &probe_addr); if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err, errno)) goto close_prog; err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT && strcmp(buf, "sys_enter") == 0; if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n", fd_type, buf)) goto close_prog; /* test zero len */ len = 0; err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id, &fd_type, &probe_offset, &probe_addr); if (CHECK(err < 0, "bpf_task_fd_query (len = 0)", "err %d errno %d\n", err, errno)) goto close_prog; err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT && len == strlen("sys_enter"); if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len)) goto close_prog; /* test empty buffer */ len = sizeof(buf); err = bpf_task_fd_query(getpid(), efd, 0, 0, &len, &prog_id, &fd_type, &probe_offset, &probe_addr); if (CHECK(err < 0, "bpf_task_fd_query (buf = 0)", "err %d errno %d\n", err, errno)) goto close_prog; err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT && len == strlen("sys_enter"); if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len)) goto close_prog; /* test smaller buffer */ len = 3; err = bpf_task_fd_query(getpid(), efd, 0, buf, &len, &prog_id, &fd_type, &probe_offset, &probe_addr); if (CHECK(err >= 0 || errno != ENOSPC, "bpf_task_fd_query (len = 3)", "err %d errno %d\n", err, errno)) goto close_prog; err = fd_type == BPF_FD_TYPE_RAW_TRACEPOINT && len == strlen("sys_enter") && strcmp(buf, "sy") == 0; if (CHECK(!err, "check_results", "fd_type %d len %u\n", fd_type, len)) goto close_prog; goto close_prog_noerr; close_prog: error_cnt++; close_prog_noerr: bpf_object__close(obj); } static void test_task_fd_query_tp_core(const char *probe_name, const char *tp_name) { const char *file = "./test_tracepoint.o"; int err, bytes, efd, prog_fd, pmu_fd; struct perf_event_attr attr = {}; __u64 probe_offset, probe_addr; __u32 len, prog_id, fd_type; struct bpf_object *obj; __u32 duration = 0; char buf[256]; err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd); if (CHECK(err, "bpf_prog_load", "err %d errno %d\n", err, errno)) goto close_prog; snprintf(buf, sizeof(buf), "/sys/kernel/debug/tracing/events/%s/id", probe_name); efd = open(buf, O_RDONLY, 0); if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno)) goto close_prog; bytes = read(efd, buf, sizeof(buf)); close(efd); if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read", "bytes %d errno %d\n", bytes, errno)) goto close_prog; attr.config = strtol(buf, NULL, 0); attr.type = PERF_TYPE_TRACEPOINT; attr.sample_type = PERF_SAMPLE_RAW; attr.sample_period = 1; attr.wakeup_events = 1; pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */, 0 /* cpu 0 */, -1 /* group id */, 0 /* flags */); if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno)) goto close_pmu; err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0); if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err, errno)) goto close_pmu; err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd); if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err, errno)) goto close_pmu; /* query (getpid(), pmu_fd) */ len = sizeof(buf); err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id, &fd_type, &probe_offset, &probe_addr); if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err, errno)) goto close_pmu; err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name); if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n", fd_type, buf)) goto close_pmu; close(pmu_fd); goto close_prog_noerr; close_pmu: close(pmu_fd); close_prog: error_cnt++; close_prog_noerr: bpf_object__close(obj); } static void test_task_fd_query_tp(void) { test_task_fd_query_tp_core("sched/sched_switch", "sched_switch"); test_task_fd_query_tp_core("syscalls/sys_enter_read", "sys_enter_read"); } int main(void) { jit_enabled = is_jit_enabled(); test_pkt_access(); test_xdp(); test_xdp_adjust_tail(); test_l4lb_all(); test_xdp_noinline(); test_tcp_estats(); test_bpf_obj_id(); test_pkt_md_access(); test_obj_name(); test_tp_attach_query(); test_stacktrace_map(); test_stacktrace_build_id(); test_stacktrace_build_id_nmi(); test_stacktrace_map_raw_tp(); test_get_stack_raw_tp(); test_task_fd_query_rawtp(); test_task_fd_query_tp(); printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt); return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS; }