bareudp: Fixed bareudp receive handling

Reverted commit "2baecda bareudp: remove unnecessary udp_encap_enable() in
bareudp_socket_create()"

An explicit call to udp_encap_enable is needed as the setup_udp_tunnel_sock
does not call udp_encap_enable if the if the socket is of type v6.

Bareudp device uses v6 socket to receive v4 & v6 traffic

CC: Taehee Yoo <ap420073@gmail.com>
Fixes: 2baecda ("bareudp: remove unnecessary udp_encap_enable() in bareudp_socket_create()")
Signed-off-by: Martin Varghese <martin.varghese@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/bareudp.c

@@ -250,6 +250,12 @@ static int bareudp_socket_create(struct bareudp_dev *bareudp, __be16 port)
 	tunnel_cfg.encap_destroy = NULL;
 	setup_udp_tunnel_sock(bareudp->net, sock, &tunnel_cfg);
 
+	/* As the setup_udp_tunnel_sock does not call udp_encap_enable if the
+	 * socket type is v6 an explicit call to udp_encap_enable is needed.
+	 */
+	if (sock->sk->sk_family == AF_INET6)
+		udp_encap_enable();
+
 	rcu_assign_pointer(bareudp->sock, sock);
 	return 0;
 }