[NET]: Add network namespace clone & unshare support.

This patch allows you to create a new network namespace
using sys_clone, or sys_unshare.

As the network namespace is still experimental and under development
clone and unshare support is only made available when CONFIG_NET_NS is
selected at compile time.

As this patch introduces network namespace support into code paths
that exist when the CONFIG_NET is not selected there are a few
additions made to net_namespace.h to allow a few more functions
to be used when the networking stack is not compiled in.

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

2 files changed, 19 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 313c6b6..a4a1410 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -27,6 +27,7 @@
 #define CLONE_NEWUTS		0x04000000	/* New utsname group? */
 #define CLONE_NEWIPC		0x08000000	/* New ipcs */
 #define CLONE_NEWUSER		0x10000000	/* New user namespace */
+#define CLONE_NEWNET		0x20000000	/* New network namespace */
 
 /*
  * Scheduling policies
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index ac8f8304..3ea4194 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -38,11 +38,23 @@ extern struct net init_net;
 
 extern struct list_head net_namespace_list;
 
+#ifdef CONFIG_NET
+extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
+#else
+static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
+{
+	/* There is nothing to copy so this is a noop */
+	return net_ns;
+}
+#endif
+
 extern void __put_net(struct net *net);
 
 static inline struct net *get_net(struct net *net)
 {
+#ifdef CONFIG_NET
 	atomic_inc(&net->count);
+#endif
 	return net;
 }
 
@@ -60,19 +72,25 @@ static inline struct net *maybe_get_net(struct net *net)
 
 static inline void put_net(struct net *net)
 {
+#ifdef CONFIG_NET
 	if (atomic_dec_and_test(&net->count))
 		__put_net(net);
+#endif
 }
 
 static inline struct net *hold_net(struct net *net)
 {
+#ifdef CONFIG_NET
 	atomic_inc(&net->use_count);
+#endif
 	return net;
 }
 
 static inline void release_net(struct net *net)
 {
+#ifdef CONFIG_NET
 	atomic_dec(&net->use_count);
+#endif
 }
 
 extern void net_lock(void);