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selftests/bpf: Add test cases for redirection between udp and unix

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Add two test cases to ensure redirection between udp and unix
work bidirectionally.

Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210704190252.11866-12-xiyou.wangcong@gmail.com
This commit is contained in:
Cong Wang 2021-07-04 12:02:52 -07:00 committed by Alexei Starovoitov
parent 5ea905dd43
commit a2ffda38dc
1 changed files with 170 additions and 0 deletions
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170
tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
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@ -1825,6 +1825,175 @@ static void test_udp_redir(struct test_sockmap_listen *skel, struct bpf_map *map
udp_skb_redir_to_connected(skel, map, family);
}
static void udp_unix_redir_to_connected(int family, int sock_mapfd,
int verd_mapfd, enum redir_mode mode)
{
const char *log_prefix = redir_mode_str(mode);
int c0, c1, p0, p1;
unsigned int pass;
int retries = 100;
int err, n;
int sfd[2];
u32 key;
char b;
zero_verdict_count(verd_mapfd);
if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0, sfd))
return;
c0 = sfd[0], p0 = sfd[1];
err = udp_socketpair(family, &p1, &c1);
if (err)
goto close;
err = add_to_sockmap(sock_mapfd, p0, p1);
if (err)
goto close_cli1;
n = write(c1, "a", 1);
if (n < 0)
FAIL_ERRNO("%s: write", log_prefix);
if (n == 0)
FAIL("%s: incomplete write", log_prefix);
if (n < 1)
goto close_cli1;
key = SK_PASS;
err = xbpf_map_lookup_elem(verd_mapfd, &key, &pass);
if (err)
goto close_cli1;
if (pass != 1)
FAIL("%s: want pass count 1, have %d", log_prefix, pass);
again:
n = read(mode == REDIR_INGRESS ? p0 : c0, &b, 1);
if (n < 0) {
if (errno == EAGAIN && retries--)
goto again;
FAIL_ERRNO("%s: read", log_prefix);
}
if (n == 0)
FAIL("%s: incomplete read", log_prefix);
close_cli1:
xclose(c1);
xclose(p1);
close:
xclose(c0);
xclose(p0);
}
static void udp_unix_skb_redir_to_connected(struct test_sockmap_listen *skel,
struct bpf_map *inner_map, int family)
{
int verdict = bpf_program__fd(skel->progs.prog_skb_verdict);
int verdict_map = bpf_map__fd(skel->maps.verdict_map);
int sock_map = bpf_map__fd(inner_map);
int err;
err = xbpf_prog_attach(verdict, sock_map, BPF_SK_SKB_VERDICT, 0);
if (err)
return;
skel->bss->test_ingress = false;
udp_unix_redir_to_connected(family, sock_map, verdict_map, REDIR_EGRESS);
skel->bss->test_ingress = true;
udp_unix_redir_to_connected(family, sock_map, verdict_map, REDIR_INGRESS);
xbpf_prog_detach2(verdict, sock_map, BPF_SK_SKB_VERDICT);
}
static void unix_udp_redir_to_connected(int family, int sock_mapfd,
int verd_mapfd, enum redir_mode mode)
{
const char *log_prefix = redir_mode_str(mode);
int c0, c1, p0, p1;
unsigned int pass;
int err, n;
int sfd[2];
u32 key;
char b;
zero_verdict_count(verd_mapfd);
err = udp_socketpair(family, &p0, &c0);
if (err)
return;
if (socketpair(AF_UNIX, SOCK_DGRAM | SOCK_NONBLOCK, 0, sfd))
goto close_cli0;
c1 = sfd[0], p1 = sfd[1];
err = add_to_sockmap(sock_mapfd, p0, p1);
if (err)
goto close;
n = write(c1, "a", 1);
if (n < 0)
FAIL_ERRNO("%s: write", log_prefix);
if (n == 0)
FAIL("%s: incomplete write", log_prefix);
if (n < 1)
goto close;
key = SK_PASS;
err = xbpf_map_lookup_elem(verd_mapfd, &key, &pass);
if (err)
goto close;
if (pass != 1)
FAIL("%s: want pass count 1, have %d", log_prefix, pass);
n = read(mode == REDIR_INGRESS ? p0 : c0, &b, 1);
if (n < 0)
FAIL_ERRNO("%s: read", log_prefix);
if (n == 0)
FAIL("%s: incomplete read", log_prefix);
close:
xclose(c1);
xclose(p1);
close_cli0:
xclose(c0);
xclose(p0);
}
static void unix_udp_skb_redir_to_connected(struct test_sockmap_listen *skel,
struct bpf_map *inner_map, int family)
{
int verdict = bpf_program__fd(skel->progs.prog_skb_verdict);
int verdict_map = bpf_map__fd(skel->maps.verdict_map);
int sock_map = bpf_map__fd(inner_map);
int err;
err = xbpf_prog_attach(verdict, sock_map, BPF_SK_SKB_VERDICT, 0);
if (err)
return;
skel->bss->test_ingress = false;
unix_udp_redir_to_connected(family, sock_map, verdict_map, REDIR_EGRESS);
skel->bss->test_ingress = true;
unix_udp_redir_to_connected(family, sock_map, verdict_map, REDIR_INGRESS);
xbpf_prog_detach2(verdict, sock_map, BPF_SK_SKB_VERDICT);
}
static void test_udp_unix_redir(struct test_sockmap_listen *skel, struct bpf_map *map,
int family)
{
const char *family_name, *map_name;
char s[MAX_TEST_NAME];
family_name = family_str(family);
map_name = map_type_str(map);
snprintf(s, sizeof(s), "%s %s %s", map_name, family_name, __func__);
if (!test__start_subtest(s))
return;
udp_unix_skb_redir_to_connected(skel, map, family);
unix_udp_skb_redir_to_connected(skel, map, family);
}
static void run_tests(struct test_sockmap_listen *skel, struct bpf_map *map,
int family)
{
@ -1834,6 +2003,7 @@ static void run_tests(struct test_sockmap_listen *skel, struct bpf_map *map,
test_reuseport(skel, map, family, SOCK_STREAM);
test_reuseport(skel, map, family, SOCK_DGRAM);
test_udp_redir(skel, map, family);
test_udp_unix_redir(skel, map, family);
}
void test_sockmap_listen(void)