forked from Minki/linux
bpf: Test new fields in bpf_attr and bpf_{prog, map}_info
This patch tests newly added fields of the bpf_attr, bpf_prog_info and bpf_map_info. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Alexei Starovoitov <ast@fb.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau
David S. Miller
parent
6e525d0667
commit
3a8ad560a9
@ -10,6 +10,7 @@
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#include <string.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <time.h>
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#include <linux/types.h>
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typedef __u16 __sum16;
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@ -19,6 +20,8 @@ typedef __u16 __sum16;
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/tcp.h>
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#include <linux/filter.h>
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#include <linux/unistd.h>
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#include <sys/wait.h>
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#include <sys/resource.h>
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@ -273,16 +276,26 @@ static void test_bpf_obj_id(void)
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const int nr_iters = 2;
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const char *file = "./test_obj_id.o";
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const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";
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const char *expected_prog_name = "test_obj_id";
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const char *expected_map_name = "test_map_id";
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const __u64 nsec_per_sec = 1000000000;
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struct bpf_object *objs[nr_iters];
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int prog_fds[nr_iters], map_fds[nr_iters];
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/* +1 to test for the info_len returned by kernel */
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struct bpf_prog_info prog_infos[nr_iters + 1];
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struct bpf_map_info map_infos[nr_iters + 1];
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/* Each prog only uses one map. +1 to test nr_map_ids
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* returned by kernel.
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*/
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__u32 map_ids[nr_iters + 1];
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char jited_insns[128], xlated_insns[128], zeros[128];
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__u32 i, next_id, info_len, nr_id_found, duration = 0;
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struct timespec real_time_ts, boot_time_ts;
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int sysctl_fd, jit_enabled = 0, err = 0;
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__u64 array_value;
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uid_t my_uid = getuid();
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time_t now, load_time;
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sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
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if (sysctl_fd != -1) {
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@ -307,6 +320,7 @@ static void test_bpf_obj_id(void)
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/* Check bpf_obj_get_info_by_fd() */
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bzero(zeros, sizeof(zeros));
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for (i = 0; i < nr_iters; i++) {
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now = time(NULL);
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err = bpf_prog_load(file, BPF_PROG_TYPE_SOCKET_FILTER,
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&objs[i], &prog_fds[i]);
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/* test_obj_id.o is a dumb prog. It should never fail
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@ -334,16 +348,18 @@ static void test_bpf_obj_id(void)
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map_infos[i].value_size != sizeof(__u64) ||
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map_infos[i].max_entries != 1 ||
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map_infos[i].map_flags != 0 ||
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info_len != sizeof(struct bpf_map_info),
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info_len != sizeof(struct bpf_map_info) ||
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strcmp((char *)map_infos[i].name, expected_map_name),
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"get-map-info(fd)",
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"err %d errno %d type %d(%d) info_len %u(%lu) key_size %u value_size %u max_entries %u map_flags %X\n",
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"err %d errno %d type %d(%d) info_len %u(%lu) key_size %u value_size %u max_entries %u map_flags %X name %s(%s)\n",
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err, errno,
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map_infos[i].type, BPF_MAP_TYPE_ARRAY,
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info_len, sizeof(struct bpf_map_info),
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map_infos[i].key_size,
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map_infos[i].value_size,
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map_infos[i].max_entries,
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map_infos[i].map_flags))
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map_infos[i].map_flags,
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map_infos[i].name, expected_map_name))
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goto done;
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/* Check getting prog info */
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@ -355,8 +371,16 @@ static void test_bpf_obj_id(void)
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prog_infos[i].jited_prog_len = sizeof(jited_insns);
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prog_infos[i].xlated_prog_insns = ptr_to_u64(xlated_insns);
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prog_infos[i].xlated_prog_len = sizeof(xlated_insns);
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prog_infos[i].map_ids = ptr_to_u64(map_ids + i);
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prog_infos[i].nr_map_ids = 2;
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err = clock_gettime(CLOCK_REALTIME, &real_time_ts);
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assert(!err);
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err = clock_gettime(CLOCK_BOOTTIME, &boot_time_ts);
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assert(!err);
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err = bpf_obj_get_info_by_fd(prog_fds[i], &prog_infos[i],
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&info_len);
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load_time = (real_time_ts.tv_sec - boot_time_ts.tv_sec)
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+ (prog_infos[i].load_time / nsec_per_sec);
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if (CHECK(err ||
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prog_infos[i].type != BPF_PROG_TYPE_SOCKET_FILTER ||
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info_len != sizeof(struct bpf_prog_info) ||
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@ -364,9 +388,14 @@ static void test_bpf_obj_id(void)
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(jit_enabled &&
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!memcmp(jited_insns, zeros, sizeof(zeros))) ||
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!prog_infos[i].xlated_prog_len ||
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!memcmp(xlated_insns, zeros, sizeof(zeros)),
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!memcmp(xlated_insns, zeros, sizeof(zeros)) ||
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load_time < now - 60 || load_time > now + 60 ||
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prog_infos[i].created_by_uid != my_uid ||
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prog_infos[i].nr_map_ids != 1 ||
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*(int *)prog_infos[i].map_ids != map_infos[i].id ||
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strcmp((char *)prog_infos[i].name, expected_prog_name),
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"get-prog-info(fd)",
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"err %d errno %d i %d type %d(%d) info_len %u(%lu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d\n",
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"err %d errno %d i %d type %d(%d) info_len %u(%lu) 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",
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err, errno, i,
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prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
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info_len, sizeof(struct bpf_prog_info),
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@ -374,9 +403,13 @@ static void test_bpf_obj_id(void)
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prog_infos[i].jited_prog_len,
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prog_infos[i].xlated_prog_len,
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!!memcmp(jited_insns, zeros, sizeof(zeros)),
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!!memcmp(xlated_insns, zeros, sizeof(zeros))))
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!!memcmp(xlated_insns, zeros, sizeof(zeros)),
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load_time, now,
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prog_infos[i].created_by_uid, my_uid,
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prog_infos[i].nr_map_ids, 1,
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*(int *)prog_infos[i].map_ids, map_infos[i].id,
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prog_infos[i].name, expected_prog_name))
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goto done;
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}
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/* Check bpf_prog_get_next_id() */
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@ -384,6 +417,7 @@ static void test_bpf_obj_id(void)
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next_id = 0;
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while (!bpf_prog_get_next_id(next_id, &next_id)) {
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struct bpf_prog_info prog_info = {};
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__u32 saved_map_id;
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int prog_fd;
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info_len = sizeof(prog_info);
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@ -406,16 +440,33 @@ static void test_bpf_obj_id(void)
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nr_id_found++;
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/* Negative test:
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* prog_info.nr_map_ids = 1
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* prog_info.map_ids = NULL
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*/
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prog_info.nr_map_ids = 1;
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err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
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if (CHECK(!err || errno != EFAULT,
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"get-prog-fd-bad-nr-map-ids", "err %d errno %d(%d)",
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err, errno, EFAULT))
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break;
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bzero(&prog_info, sizeof(prog_info));
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info_len = sizeof(prog_info);
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saved_map_id = *(int *)(prog_infos[i].map_ids);
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prog_info.map_ids = prog_infos[i].map_ids;
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prog_info.nr_map_ids = 2;
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err = bpf_obj_get_info_by_fd(prog_fd, &prog_info, &info_len);
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prog_infos[i].jited_prog_insns = 0;
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prog_infos[i].xlated_prog_insns = 0;
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CHECK(err || info_len != sizeof(struct bpf_prog_info) ||
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memcmp(&prog_info, &prog_infos[i], info_len),
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memcmp(&prog_info, &prog_infos[i], info_len) ||
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*(int *)prog_info.map_ids != saved_map_id,
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"get-prog-info(next_id->fd)",
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"err %d errno %d info_len %u(%lu) memcmp %d\n",
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"err %d errno %d info_len %u(%lu) memcmp %d map_id %u(%u)\n",
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err, errno, info_len, sizeof(struct bpf_prog_info),
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memcmp(&prog_info, &prog_infos[i], info_len));
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memcmp(&prog_info, &prog_infos[i], info_len),
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*(int *)prog_info.map_ids, saved_map_id);
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close(prog_fd);
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}
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CHECK(nr_id_found != nr_iters,
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@ -497,6 +548,75 @@ static void test_pkt_md_access(void)
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bpf_object__close(obj);
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}
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static void test_obj_name(void)
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{
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struct {
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const char *name;
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int success;
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int expected_errno;
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} tests[] = {
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{ "", 1, 0 },
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{ "_123456789ABCDE", 1, 0 },
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{ "_123456789ABCDEF", 0, EINVAL },
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{ "_123456789ABCD\n", 0, EINVAL },
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};
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struct bpf_insn prog[] = {
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BPF_ALU64_IMM(BPF_MOV, BPF_REG_0, 0),
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BPF_EXIT_INSN(),
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};
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__u32 duration = 0;
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int i;
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for (i = 0; i < sizeof(tests) / sizeof(tests[0]); i++) {
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size_t name_len = strlen(tests[i].name) + 1;
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union bpf_attr attr;
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size_t ncopy;
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int fd;
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/* test different attr.prog_name during BPF_PROG_LOAD */
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ncopy = name_len < sizeof(attr.prog_name) ?
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name_len : sizeof(attr.prog_name);
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bzero(&attr, sizeof(attr));
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attr.prog_type = BPF_PROG_TYPE_SCHED_CLS;
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attr.insn_cnt = 2;
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attr.insns = ptr_to_u64(prog);
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attr.license = ptr_to_u64("");
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memcpy(attr.prog_name, tests[i].name, ncopy);
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fd = syscall(__NR_bpf, BPF_PROG_LOAD, &attr, sizeof(attr));
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CHECK((tests[i].success && fd < 0) ||
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(!tests[i].success && fd != -1) ||
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(!tests[i].success && errno != tests[i].expected_errno),
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"check-bpf-prog-name",
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"fd %d(%d) errno %d(%d)\n",
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fd, tests[i].success, errno, tests[i].expected_errno);
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if (fd != -1)
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close(fd);
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/* test different attr.map_name during BPF_MAP_CREATE */
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ncopy = name_len < sizeof(attr.map_name) ?
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name_len : sizeof(attr.map_name);
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bzero(&attr, sizeof(attr));
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attr.map_type = BPF_MAP_TYPE_ARRAY;
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attr.key_size = 4;
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attr.value_size = 4;
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attr.max_entries = 1;
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attr.map_flags = 0;
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memcpy(attr.map_name, tests[i].name, ncopy);
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fd = syscall(__NR_bpf, BPF_MAP_CREATE, &attr, sizeof(attr));
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CHECK((tests[i].success && fd < 0) ||
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(!tests[i].success && fd != -1) ||
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(!tests[i].success && errno != tests[i].expected_errno),
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"check-bpf-map-name",
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"fd %d(%d) errno %d(%d)\n",
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fd, tests[i].success, errno, tests[i].expected_errno);
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if (fd != -1)
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close(fd);
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}
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}
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int main(void)
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{
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struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
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@ -509,6 +629,7 @@ int main(void)
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test_tcp_estats();
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test_bpf_obj_id();
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test_pkt_md_access();
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test_obj_name();
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printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
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return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;
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