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selftests/bpf: Add a test case for unix sockmap

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Add a test case to ensure redirection between two AF_UNIX
datagram sockets work.

Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210704190252.11866-11-xiyou.wangcong@gmail.com
This commit is contained in:
Cong Wang
2021-07-04 12:02:51 -07:00
committed by Alexei Starovoitov
parent 0626bc2ff6
commit 5ea905dd43
1 changed files with 97 additions and 0 deletions
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97
tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
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@@ -1435,6 +1435,8 @@ static const char *family_str(sa_family_t family)
return "IPv4";
case AF_INET6:
return "IPv6";
case AF_UNIX:
return "Unix";
default:
return "unknown";
}
@@ -1557,6 +1559,99 @@ static void test_redir(struct test_sockmap_listen *skel, struct bpf_map *map,
}
}
static void unix_redir_to_connected(int sotype, 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, sotype | SOCK_NONBLOCK, 0, sfd))
return;
c0 = sfd[0], p0 = sfd[1];
if (socketpair(AF_UNIX, sotype | SOCK_NONBLOCK, 0, sfd))
goto close0;
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);
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:
xclose(c1);
xclose(p1);
close0:
xclose(c0);
xclose(p0);
}
static void unix_skb_redir_to_connected(struct test_sockmap_listen *skel,
struct bpf_map *inner_map, int sotype)
{
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_redir_to_connected(sotype, sock_map, verdict_map, REDIR_EGRESS);
skel->bss->test_ingress = true;
unix_redir_to_connected(sotype, sock_map, verdict_map, REDIR_INGRESS);
xbpf_prog_detach2(verdict, sock_map, BPF_SK_SKB_VERDICT);
}
static void test_unix_redir(struct test_sockmap_listen *skel, struct bpf_map *map,
int sotype)
{
const char *family_name, *map_name;
char s[MAX_TEST_NAME];
family_name = family_str(AF_UNIX);
map_name = map_type_str(map);
snprintf(s, sizeof(s), "%s %s %s", map_name, family_name, __func__);
if (!test__start_subtest(s))
return;
unix_skb_redir_to_connected(skel, map, sotype);
}
static void test_reuseport(struct test_sockmap_listen *skel,
struct bpf_map *map, int family, int sotype)
{
@@ -1754,10 +1849,12 @@ void test_sockmap_listen(void)
skel->bss->test_sockmap = true;
run_tests(skel, skel->maps.sock_map, AF_INET);
run_tests(skel, skel->maps.sock_map, AF_INET6);
test_unix_redir(skel, skel->maps.sock_map, SOCK_DGRAM);
skel->bss->test_sockmap = false;
run_tests(skel, skel->maps.sock_hash, AF_INET);
run_tests(skel, skel->maps.sock_hash, AF_INET6);
test_unix_redir(skel, skel->maps.sock_hash, SOCK_DGRAM);
test_sockmap_listen__destroy(skel);
}