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-rw-r--r--include/net/net_namespace.h68
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 00000000000..6344b77f81a
--- /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 */