[NET]: Add a network namespace parameter to tasks

This is the network namespace from which all which all sockets
and anything else under user control ultimately get their network
namespace parameters.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/init_task.h

@@ -9,6 +9,7 @@
 #include <linux/ipc.h>
 #include <linux/pid_namespace.h>
 #include <linux/user_namespace.h>
+#include <net/net_namespace.h>
 
 #define INIT_FDTABLE \
 {							\
@@ -78,6 +79,7 @@ extern struct nsproxy init_nsproxy;
 	.nslock		= __SPIN_LOCK_UNLOCKED(nsproxy.nslock),		\
 	.uts_ns		= &init_uts_ns,					\
 	.mnt_ns		= NULL,						\
+	.net_ns		= &init_net,					\
 	INIT_IPC_NS(ipc_ns)						\
 	.user_ns	= &init_user_ns,				\
 }

include/linux/nsproxy.h

@@ -29,6 +29,7 @@ struct nsproxy {
 	struct mnt_namespace *mnt_ns;
 	struct pid_namespace *pid_ns;
 	struct user_namespace *user_ns;
+	struct net 	     *net_ns;
 };
 extern struct nsproxy init_nsproxy;