2 * Operations on the network namespace
4 #ifndef __NET_NET_NAMESPACE_H
5 #define __NET_NET_NAMESPACE_H
7 #include <asm/atomic.h>
8 #include <linux/workqueue.h>
9 #include <linux/list.h>
11 struct proc_dir_entry;
14 atomic_t count; /* To decided when the network
15 * namespace should be freed.
17 atomic_t use_count; /* To track references we
20 struct list_head list; /* list of network namespaces */
21 struct work_struct work; /* work struct for freeing */
23 struct proc_dir_entry *proc_net;
24 struct proc_dir_entry *proc_net_stat;
25 struct proc_dir_entry *proc_net_root;
27 struct net_device *loopback_dev; /* The loopback */
29 struct list_head dev_base_head;
30 struct hlist_head *dev_name_head;
31 struct hlist_head *dev_index_head;
35 /* Init's network namespace */
36 extern struct net init_net;
37 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
39 #define INIT_NET_NS(net_ns)
42 extern struct list_head net_namespace_list;
45 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
47 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
49 /* There is nothing to copy so this is a noop */
54 extern void __put_net(struct net *net);
56 static inline struct net *get_net(struct net *net)
59 atomic_inc(&net->count);
64 static inline struct net *maybe_get_net(struct net *net)
66 /* Used when we know struct net exists but we
67 * aren't guaranteed a previous reference count
68 * exists. If the reference count is zero this
69 * function fails and returns NULL.
71 if (!atomic_inc_not_zero(&net->count))
76 static inline void put_net(struct net *net)
79 if (atomic_dec_and_test(&net->count))
84 static inline struct net *hold_net(struct net *net)
87 atomic_inc(&net->use_count);
92 static inline void release_net(struct net *net)
95 atomic_dec(&net->use_count);
99 #define for_each_net(VAR) \
100 list_for_each_entry(VAR, &net_namespace_list, list)
106 #define __net_init __init
107 #define __net_exit __exit_refok
110 struct pernet_operations {
111 struct list_head list;
112 int (*init)(struct net *net);
113 void (*exit)(struct net *net);
116 extern int register_pernet_subsys(struct pernet_operations *);
117 extern void unregister_pernet_subsys(struct pernet_operations *);
118 extern int register_pernet_device(struct pernet_operations *);
119 extern void unregister_pernet_device(struct pernet_operations *);
121 #endif /* __NET_NET_NAMESPACE_H */