1 files changed, 123 insertions, 0 deletions
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
new file mode 100644
index 000000000000..93aa87d32804
--- /dev/null
+++ b/include/net/net_namespace.h
@@ -0,0 +1,123 @@
+/*
+ * 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 proc_dir_entry;
+struct net_device;
+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 */
+
+	struct proc_dir_entry 	*proc_net;
+	struct proc_dir_entry 	*proc_net_stat;
+	struct proc_dir_entry 	*proc_net_root;
+
+	struct net_device       *loopback_dev;          /* The loopback */
+
+	struct list_head 	dev_base_head;
+	struct hlist_head 	*dev_name_head;
+	struct hlist_head	*dev_index_head;
+};
+
+#ifdef CONFIG_NET
+/* Init's network namespace */
+extern struct net init_net;
+#define INIT_NET_NS(net_ns) .net_ns = &init_net,
+#else
+#define INIT_NET_NS(net_ns)
+#endif
+
+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;
+}
+
+static inline struct net *maybe_get_net(struct net *net)
+{
+	/* Used when we know struct net exists but we
+	 * aren't guaranteed a previous reference count
+	 * exists.  If the reference count is zero this
+	 * function fails and returns NULL.
+	 */
+	if (!atomic_inc_not_zero(&net->count))
+		net = NULL;
+	return 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
+}
+
+#define for_each_net(VAR)				\
+	list_for_each_entry(VAR, &net_namespace_list, list)
+
+#ifdef CONFIG_NET_NS
+#define __net_init
+#define __net_exit
+#define __net_initdata
+#else
+#define __net_init	__init
+#define __net_exit	__exit_refok
+#define __net_initdata	__initdata
+#endif
+
+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 */