selftests: net/psock_fanout: unbound socket fanout

Add a test that validates that an unbound packet socket cannot create/join
a fanout group.

Signed-off-by: Gur Stavi <gur.stavi@huawei.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/7612fa90f613100e2b64c563cab3d7fdf36010db.1728802323.git.gur.stavi@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/tools/testing/selftests/net/psock_fanout.c b/tools/testing/selftests/net/psock_fanout.c
index acdfae8f8a9a18bec0af50cedc8df0c898811670..84c5243570759b1c259c81aedaa13daa878703d9 100644 (file)
--- a/tools/testing/selftests/net/psock_fanout.c
+++ b/tools/testing/selftests/net/psock_fanout.c
@@ -279,6 +279,41 @@ static int sock_fanout_read(int fds[], char *rings[], const int expect[])
        return 0;
 }
 
+/* Test that creating/joining a fanout group fails for unbound socket without
+ * a specified protocol
+ */
+static void test_unbound_fanout(void)
+{
+       int val, fd0, fd1, err;
+
+       fprintf(stderr, "test: unbound fanout\n");
+       fd0 = socket(PF_PACKET, SOCK_RAW, 0);
+       if (fd0 < 0) {
+               perror("socket packet");
+               exit(1);
+       }
+       /* Try to create a new fanout group. Should fail. */
+       val = (PACKET_FANOUT_HASH << 16) | 1;
+       err = setsockopt(fd0, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val));
+       if (!err) {
+               fprintf(stderr, "ERROR: unbound socket fanout create\n");
+               exit(1);
+       }
+       fd1 = sock_fanout_open(PACKET_FANOUT_HASH, 1);
+       if (fd1 == -1) {
+               fprintf(stderr, "ERROR: failed to open HASH socket\n");
+               exit(1);
+       }
+       /* Try to join an existing fanout group. Should fail. */
+       err = setsockopt(fd0, SOL_PACKET, PACKET_FANOUT, &val, sizeof(val));
+       if (!err) {
+               fprintf(stderr, "ERROR: unbound socket fanout join\n");
+               exit(1);
+       }
+       close(fd0);
+       close(fd1);
+}
+
 /* Test illegal mode + flag combination */
 static void test_control_single(void)
 {
@@ -523,6 +558,7 @@ int main(int argc, char **argv)
        const int expect_uniqueid[2][2] = { { 20, 20},  { 20, 20 } };
        int port_off = 2, tries = 20, ret;
 
+       test_unbound_fanout();
        test_control_single();
        test_control_group(0);
        test_control_group(1);