Bluetooth: Disallow usage of L2CAP CID setting for now

In the future the L2CAP layer will have full support for fixed channels
and right now it already can export the channel assignment, but for the
functions bind() and connect() the usage of only CID 0 is allowed. This
allows an easy detection if the kernel supports fixed channels or not,
because otherwise it would impossible for application to tell.
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap.c

@@ -799,6 +799,9 @@ static int l2cap_sock_bind(struct socket *sock, struct sockaddr *addr, int alen)
 	len = min_t(unsigned int, sizeof(la), alen);
 	memcpy(&la, addr, len);
 
+	if (la.l2_cid)
+		return -EINVAL;
+
 	lock_sock(sk);
 
 	if (sk->sk_state != BT_OPEN) {
@@ -929,19 +932,20 @@ static int l2cap_sock_connect(struct socket *sock, struct sockaddr *addr, int al
 	struct sockaddr_l2 la;
 	int len, err = 0;
 
-	lock_sock(sk);
-
 	BT_DBG("sk %p", sk);
 
-	if (!addr || addr->sa_family != AF_BLUETOOTH) {
-		err = -EINVAL;
-		goto done;
-	}
+	if (!addr || addr->sa_family != AF_BLUETOOTH)
+		return -EINVAL;
 
 	memset(&la, 0, sizeof(la));
 	len = min_t(unsigned int, sizeof(la), alen);
 	memcpy(&la, addr, len);
 
+	if (la.l2_cid)
+		return -EINVAL;
+
+	lock_sock(sk);
+
 	if (sk->sk_type == SOCK_SEQPACKET && !la.l2_psm) {
 		err = -EINVAL;
 		goto done;