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

[mirror_ubuntu-bionic-kernel.git] / include / net / net_namespace.h

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index ac8f8304094ed62e25c4f35eb1a9203fe89f386c..3ea4194613edfa434f18c903510733b4ba4cc329 100644 (file)
--- 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);