vsock/test: Test setting SO_ZEROCOPY on accept()ed socket

Make sure setsockopt(SOL_SOCKET, SO_ZEROCOPY) on an accept()ed socket is
handled by vsock's implementation.

Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Michal Luczaj <mhal@rbox.co>
Link: https://patch.msgid.link/20251229-vsock-child-sock-custom-sockopt-v2-2-64778d6c4f88@rbox.co
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

1 files changed, 32 insertions, 0 deletions

diff --git a/tools/testing/vsock/vsock_test.c b/tools/testing/vsock/vsock_test.c
index 9e1250790f33..bbe3723babdc 100644
--- a/tools/testing/vsock/vsock_test.c
+++ b/tools/testing/vsock/vsock_test.c
@@ -2192,6 +2192,33 @@ static void test_stream_nolinger_server(const struct test_opts *opts)
 	close(fd);
 }
 
+static void test_stream_accepted_setsockopt_client(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_stream_connect(opts->peer_cid, opts->peer_port);
+	if (fd < 0) {
+		perror("connect");
+		exit(EXIT_FAILURE);
+	}
+
+	close(fd);
+}
+
+static void test_stream_accepted_setsockopt_server(const struct test_opts *opts)
+{
+	int fd;
+
+	fd = vsock_stream_accept(VMADDR_CID_ANY, opts->peer_port, NULL);
+	if (fd < 0) {
+		perror("accept");
+		exit(EXIT_FAILURE);
+	}
+
+	enable_so_zerocopy_check(fd);
+	close(fd);
+}
+
 static struct test_case test_cases[] = {
 	{
 		.name = "SOCK_STREAM connection reset",
@@ -2371,6 +2398,11 @@ static struct test_case test_cases[] = {
 		.run_client = test_seqpacket_unread_bytes_client,
 		.run_server = test_seqpacket_unread_bytes_server,
 	},
+	{
+		.name = "SOCK_STREAM accept()ed socket custom setsockopt()",
+		.run_client = test_stream_accepted_setsockopt_client,
+		.run_server = test_stream_accepted_setsockopt_server,
+	},
 	{},
 };