[NETNS]: Add an empty netns_dccp structure on struct net.

According to the overall struct net design, it will be
filled with DCCP-related members.
Signed-off-by: NPavel Emelyanov <xemul@openvz.org>
Acked-by: NArnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/net/net_namespace.h

@@ -13,6 +13,7 @@
 #include <net/netns/packet.h>
 #include <net/netns/ipv4.h>
 #include <net/netns/ipv6.h>
+#include <net/netns/dccp.h>
 #include <net/netns/x_tables.h>
 
 struct proc_dir_entry;
@@ -54,6 +55,9 @@ struct net {
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 	struct netns_ipv6	ipv6;
 #endif
+#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
+	struct netns_dccp	dccp;
+#endif
 #ifdef CONFIG_NETFILTER
 	struct netns_xt		xt;
 #endif

include/net/netns/dccp.h

+#ifndef __NETNS_DCCP_H__
+#define __NETNS_DCCP_H__
+
+struct netns_dccp {
+};
+
+#endif