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selftests/bpf: add a test case for vsock sockmap 

Add a test case testing the redirection from connectible AF_VSOCK
sockets to connectible AF_UNIX sockets.

Signed-off-by: Bobby Eshleman <bobby.eshleman@bytedance.com>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bobby Eshleman 2023-03-27 19:11:53 +00:00 committed by David S. Miller
parent c7c605c982
commit d61bd8c1fd
1 changed files with 163 additions and 0 deletions
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163
tools/testing/selftests/bpf/prog_tests/sockmap_listen.c
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@ -18,6 +18,7 @@
#include <string.h>
#include <sys/select.h>
#include <unistd.h>
#include <linux/vm_sockets.h>
#include <bpf/bpf.h>
#include <bpf/libbpf.h>
@ -251,6 +252,16 @@ static void init_addr_loopback6(struct sockaddr_storage *ss, socklen_t *len)
*len = sizeof(*addr6);
}
static void init_addr_loopback_vsock(struct sockaddr_storage *ss, socklen_t *len)
{
struct sockaddr_vm *addr = memset(ss, 0, sizeof(*ss));
addr->svm_family = AF_VSOCK;
addr->svm_port = VMADDR_PORT_ANY;
addr->svm_cid = VMADDR_CID_LOCAL;
*len = sizeof(*addr);
}
static void init_addr_loopback(int family, struct sockaddr_storage *ss,
socklen_t *len)
{
@ -261,6 +272,9 @@ static void init_addr_loopback(int family, struct sockaddr_storage *ss,
case AF_INET6:
init_addr_loopback6(ss, len);
return;
case AF_VSOCK:
init_addr_loopback_vsock(ss, len);
return;
default:
FAIL("unsupported address family %d", family);
}
@ -1478,6 +1492,8 @@ static const char *family_str(sa_family_t family)
return "IPv6";
case AF_UNIX:
return "Unix";
case AF_VSOCK:
return "VSOCK";
default:
return "unknown";
}
@ -1689,6 +1705,151 @@ static void test_unix_redir(struct test_sockmap_listen *skel, struct bpf_map *ma
unix_skb_redir_to_connected(skel, map, sotype);
}
/* Returns two connected loopback vsock sockets */
static int vsock_socketpair_connectible(int sotype, int *v0, int *v1)
{
struct sockaddr_storage addr;
socklen_t len = sizeof(addr);
int s, p, c;
s = socket_loopback(AF_VSOCK, sotype);
if (s < 0)
return -1;
c = xsocket(AF_VSOCK, sotype | SOCK_NONBLOCK, 0);
if (c == -1)
goto close_srv;
if (getsockname(s, sockaddr(&addr), &len) < 0)
goto close_cli;
if (connect(c, sockaddr(&addr), len) < 0 && errno != EINPROGRESS) {
FAIL_ERRNO("connect");
goto close_cli;
}
len = sizeof(addr);
p = accept_timeout(s, sockaddr(&addr), &len, IO_TIMEOUT_SEC);
if (p < 0)
goto close_cli;
*v0 = p;
*v1 = c;
return 0;
close_cli:
close(c);
close_srv:
close(s);
return -1;
}
static void vsock_unix_redir_connectible(int sock_mapfd, int verd_mapfd,
enum redir_mode mode, int sotype)
{
const char *log_prefix = redir_mode_str(mode);
char a = 'a', b = 'b';
int u0, u1, v0, v1;
int sfd[2];
unsigned int pass;
int err, n;
u32 key;
zero_verdict_count(verd_mapfd);
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK, 0, sfd))
return;
u0 = sfd[0];
u1 = sfd[1];
err = vsock_socketpair_connectible(sotype, &v0, &v1);
if (err) {
FAIL("vsock_socketpair_connectible() failed");
goto close_uds;
}
err = add_to_sockmap(sock_mapfd, u0, v0);
if (err) {
FAIL("add_to_sockmap failed");
goto close_vsock;
}
n = write(v1, &a, sizeof(a));
if (n < 0)
FAIL_ERRNO("%s: write", log_prefix);
if (n == 0)
FAIL("%s: incomplete write", log_prefix);
if (n < 1)
goto out;
n = recv(mode == REDIR_INGRESS ? u0 : u1, &b, sizeof(b), MSG_DONTWAIT);
if (n < 0)
FAIL("%s: recv() err, errno=%d", log_prefix, errno);
if (n == 0)
FAIL("%s: incomplete recv", log_prefix);
if (b != a)
FAIL("%s: vsock socket map failed, %c != %c", log_prefix, a, b);
key = SK_PASS;
err = xbpf_map_lookup_elem(verd_mapfd, &key, &pass);
if (err)
goto out;
if (pass != 1)
FAIL("%s: want pass count 1, have %d", log_prefix, pass);
out:
key = 0;
bpf_map_delete_elem(sock_mapfd, &key);
key = 1;
bpf_map_delete_elem(sock_mapfd, &key);
close_vsock:
close(v0);
close(v1);
close_uds:
close(u0);
close(u1);
}
static void vsock_unix_skb_redir_connectible(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;
vsock_unix_redir_connectible(sock_map, verdict_map, REDIR_EGRESS, sotype);
skel->bss->test_ingress = true;
vsock_unix_redir_connectible(sock_map, verdict_map, REDIR_INGRESS, sotype);
xbpf_prog_detach2(verdict, sock_map, BPF_SK_SKB_VERDICT);
}
static void test_vsock_redir(struct test_sockmap_listen *skel, struct bpf_map *map)
{
const char *family_name, *map_name;
char s[MAX_TEST_NAME];
family_name = family_str(AF_VSOCK);
map_name = map_type_str(map);
snprintf(s, sizeof(s), "%s %s %s", map_name, family_name, __func__);
if (!test__start_subtest(s))
return;
vsock_unix_skb_redir_connectible(skel, map, SOCK_STREAM);
vsock_unix_skb_redir_connectible(skel, map, SOCK_SEQPACKET);
}
static void test_reuseport(struct test_sockmap_listen *skel,
struct bpf_map *map, int family, int sotype)
{
@ -2060,12 +2221,14 @@ void serial_test_sockmap_listen(void)
run_tests(skel, skel->maps.sock_map, AF_INET6);
test_unix_redir(skel, skel->maps.sock_map, SOCK_DGRAM);
test_unix_redir(skel, skel->maps.sock_map, SOCK_STREAM);
test_vsock_redir(skel, skel->maps.sock_map);
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_unix_redir(skel, skel->maps.sock_hash, SOCK_STREAM);
test_vsock_redir(skel, skel->maps.sock_hash);
test_sockmap_listen__destroy(skel);
}