[NETNS]: Introduce a netns_core structure.

There's already some stuff on the struct net, that should better
be folded into netns_core structure. I'm making the per-proto inuse 
counter be per-net also, which is also a candidate for this, so 
introduce this structure and populate it a bit.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index f8f3d1a..c01d45f 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -8,6 +8,7 @@
 #include <linux/workqueue.h>
 #include <linux/list.h>
 
+#include <net/netns/core.h>
 #include <net/netns/unix.h>
 #include <net/netns/packet.h>
 #include <net/netns/ipv4.h>
@@ -46,10 +47,7 @@
 
 	struct sock 		*rtnl;			/* rtnetlink socket */
 
-	/* core sysctls */
-	struct ctl_table_header	*sysctl_core_hdr;
-	int			sysctl_somaxconn;
-
+	struct netns_core	core;
 	struct netns_packet	packet;
 	struct netns_unix	unx;
 	struct netns_ipv4	ipv4;
diff --git a/include/net/netns/core.h b/include/net/netns/core.h
new file mode 100644
index 0000000..0e8c0f8
--- /dev/null
+++ b/include/net/netns/core.h
@@ -0,0 +1,13 @@
+#ifndef __NETNS_CORE_H__
+#define __NETNS_CORE_H__
+
+struct ctl_table_header;
+
+struct netns_core {
+	/* core sysctls */
+	struct ctl_table_header	*sysctl_hdr;
+
+	int	sysctl_somaxconn;
+};
+
+#endif