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 */