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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 2017-09-27 14:37:56 -07:00 committed by David S. Miller
parent 6e525d0667
commit 3a8ad560a9
1 changed files with 132 additions and 11 deletions
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143
tools/testing/selftests/bpf/test_progs.c
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@ -10,6 +10,7 @@
#include <string.h>
#include <assert.h>
#include <stdlib.h>
#include <time.h>
#include <linux/types.h>
typedef __u16 __sum16;
@ -19,6 +20,8 @@ typedef __u16 __sum16;
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/tcp.h>
#include <linux/filter.h>
#include <linux/unistd.h>
#include <sys/wait.h>
#include <sys/resource.h>
@ -273,16 +276,26 @@ static void test_bpf_obj_id(void)
const int nr_iters = 2;
const char *file = "./test_obj_id.o";
const char *jit_sysctl = "/proc/sys/net/core/bpf_jit_enable";
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 sysctl_fd, jit_enabled = 0, err = 0;
__u64 array_value;
uid_t my_uid = getuid();
time_t now, load_time;
sysctl_fd = open(jit_sysctl, 0, O_RDONLY);
if (sysctl_fd != -1) {
@ -307,6 +320,7 @@ static void test_bpf_obj_id(void)
/* 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
@ -334,16 +348,18 @@ static void test_bpf_obj_id(void)
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),
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(%lu) key_size %u value_size %u max_entries %u map_flags %X\n",
"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",
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].map_flags,
map_infos[i].name, expected_map_name))
goto done;
/* Check getting prog info */
@ -355,8 +371,16 @@ static void test_bpf_obj_id(void)
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) ||
@ -364,9 +388,14 @@ static void test_bpf_obj_id(void)
(jit_enabled &&
!memcmp(jited_insns, zeros, sizeof(zeros))) ||
!prog_infos[i].xlated_prog_len ||
!memcmp(xlated_insns, zeros, sizeof(zeros)),
!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(%lu) jit_enabled %d jited_prog_len %u xlated_prog_len %u jited_prog %d xlated_prog %d\n",
"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",
err, errno, i,
prog_infos[i].type, BPF_PROG_TYPE_SOCKET_FILTER,
info_len, sizeof(struct bpf_prog_info),
@ -374,9 +403,13 @@ static void test_bpf_obj_id(void)
prog_infos[i].jited_prog_len,
prog_infos[i].xlated_prog_len,
!!memcmp(jited_insns, zeros, sizeof(zeros)),
!!memcmp(xlated_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() */
@ -384,6 +417,7 @@ static void test_bpf_obj_id(void)
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);
@ -406,16 +440,33 @@ static void test_bpf_obj_id(void)
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),
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(%lu) memcmp %d\n",
"err %d errno %d info_len %u(%lu) memcmp %d map_id %u(%u)\n",
err, errno, info_len, sizeof(struct bpf_prog_info),
memcmp(&prog_info, &prog_infos[i], info_len));
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,
@ -497,6 +548,75 @@ static void test_pkt_md_access(void)
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);
}
}
int main(void)
{
struct rlimit rinf = { RLIM_INFINITY, RLIM_INFINITY };
@ -509,6 +629,7 @@ int main(void)
test_tcp_estats();
test_bpf_obj_id();
test_pkt_md_access();
test_obj_name();
printf("Summary: %d PASSED, %d FAILED\n", pass_cnt, error_cnt);
return error_cnt ? EXIT_FAILURE : EXIT_SUCCESS;