1 files changed, 68 insertions, 0 deletions

diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
new file mode 100644
index 000000000000..6344b77f81a2
--- /dev/null
+++ b/include/net/net_namespace.h
@@ -0,0 +1,68 @@
+/*
+ * Operations on the network namespace
+ */
+#ifndef __NET_NET_NAMESPACE_H
+#define __NET_NET_NAMESPACE_H
+
+#include <asm/atomic.h>
+#include <linux/workqueue.h>
+#include <linux/list.h>
+
+struct net {
+        atomic_t                count;          /* To decided when the network
+                                                 *  namespace should be freed.
+                                                 */
+        atomic_t                use_count;      /* To track references we
+                                                 * destroy on demand
+                                                 */
+        struct list_head        list;           /* list of network namespaces */
+        struct work_struct      work;           /* work struct for freeing */
+};
+
+extern struct net init_net;
+extern struct list_head net_namespace_list;
+
+extern void __put_net(struct net *net);
+
+static inline struct net *get_net(struct net *net)
+{
+        atomic_inc(&net->count);
+        return net;
+}
+
+static inline void put_net(struct net *net)
+{
+        if (atomic_dec_and_test(&net->count))
+                __put_net(net);
+}
+
+static inline struct net *hold_net(struct net *net)
+{
+        atomic_inc(&net->use_count);
+        return net;
+}
+
+static inline void release_net(struct net *net)
+{
+        atomic_dec(&net->use_count);
+}
+
+extern void net_lock(void);
+extern void net_unlock(void);
+
+#define for_each_net(VAR)                               \
+        list_for_each_entry(VAR, &net_namespace_list, list)
+
+
+struct pernet_operations {
+        struct list_head list;
+        int (*init)(struct net *net);
+        void (*exit)(struct net *net);
+};
+
+extern int register_pernet_subsys(struct pernet_operations *);
+extern void unregister_pernet_subsys(struct pernet_operations *);
+extern int register_pernet_device(struct pernet_operations *);
+extern void unregister_pernet_device(struct pernet_operations *);
+
+#endif /* __NET_NET_NAMESPACE_H */