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selftest/bpf: Add vsock test for sockmap rejecting unconnected

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Verify that for a connectible AF_VSOCK socket, merely having a transport
assigned is insufficient; socket must be connected for the sockmap to
accept.

This does not test datagram vsocks. Even though it hardly matters. VMCI is
the only transport that features VSOCK_TRANSPORT_F_DGRAM, but it has an
unimplemented vsock_transport::readskb() callback, making it unsupported by
BPF/sockmap.

Signed-off-by: Michal Luczaj <mhal@rbox.co>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Michal Luczaj 2025-02-13 12:58:52 +01:00 • committed by Paolo Abeni
parent 8350695bfb
commit 85928e9c43
1 changed files with 30 additions and 0 deletions
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30
tools/testing/selftests/bpf/prog_tests/sockmap_basic.c
View file

@ -1065,6 +1065,34 @@ destroy:
test_sockmap_pass_prog__destroy(skel);
}
static void test_sockmap_vsock_unconnected(void)
{
struct sockaddr_storage addr;
int map, s, zero = 0;
socklen_t alen;
map = bpf_map_create(BPF_MAP_TYPE_SOCKMAP, NULL, sizeof(int),
sizeof(int), 1, NULL);
if (!ASSERT_OK_FD(map, "bpf_map_create"))
return;
s = xsocket(AF_VSOCK, SOCK_STREAM, 0);
if (s < 0)
goto close_map;
/* Fail connect(), but trigger transport assignment. */
init_addr_loopback(AF_VSOCK, &addr, &alen);
if (!ASSERT_ERR(connect(s, sockaddr(&addr), alen), "connect"))
goto close_sock;
ASSERT_ERR(bpf_map_update_elem(map, &zero, &s, BPF_ANY), "map_update");
close_sock:
xclose(s);
close_map:
xclose(map);
}
void test_sockmap_basic(void)
{
if (test__start_subtest("sockmap create_update_free"))
@ -1131,4 +1159,6 @@ void test_sockmap_basic(void)
test_skmsg_helpers_with_link(BPF_MAP_TYPE_SOCKHASH);
if (test__start_subtest("sockmap skb_verdict vsock poll"))
test_sockmap_skb_verdict_vsock_poll();
if (test__start_subtest("sockmap vsock unconnected"))
test_sockmap_vsock_unconnected();
}