V4L/DVB (6653): Add support for the DViCO FusionHDTV NANO2 w/ZL10353 and firmware
[linux-2.6/verdex.git] / include / net / net_namespace.h
blob5dd6d90b37eb778dfffde65e4998b0bdb8c8d13b
1 /*
2 * Operations on the network namespace
3 */
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;
12 struct net_device;
13 struct net {
14 atomic_t count; /* To decided when the network
15 * namespace should be freed.
17 atomic_t use_count; /* To track references we
18 * destroy on demand
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;
34 #ifdef CONFIG_NET
35 /* Init's network namespace */
36 extern struct net init_net;
37 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
38 #else
39 #define INIT_NET_NS(net_ns)
40 #endif
42 extern struct list_head net_namespace_list;
44 #ifdef CONFIG_NET
45 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
46 #else
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 */
50 return net_ns;
52 #endif
54 #ifdef CONFIG_NET_NS
55 extern void __put_net(struct net *net);
57 static inline struct net *get_net(struct net *net)
59 atomic_inc(&net->count);
60 return net;
63 static inline struct net *maybe_get_net(struct net *net)
65 /* Used when we know struct net exists but we
66 * aren't guaranteed a previous reference count
67 * exists. If the reference count is zero this
68 * function fails and returns NULL.
70 if (!atomic_inc_not_zero(&net->count))
71 net = NULL;
72 return net;
75 static inline void put_net(struct net *net)
77 if (atomic_dec_and_test(&net->count))
78 __put_net(net);
81 static inline struct net *hold_net(struct net *net)
83 atomic_inc(&net->use_count);
84 return net;
87 static inline void release_net(struct net *net)
89 atomic_dec(&net->use_count);
91 #else
92 static inline struct net *get_net(struct net *net)
94 return net;
97 static inline void put_net(struct net *net)
101 static inline struct net *hold_net(struct net *net)
103 return net;
106 static inline void release_net(struct net *net)
110 static inline struct net *maybe_get_net(struct net *net)
112 return net;
114 #endif
116 #define for_each_net(VAR) \
117 list_for_each_entry(VAR, &net_namespace_list, list)
119 #ifdef CONFIG_NET_NS
120 #define __net_init
121 #define __net_exit
122 #define __net_initdata
123 #else
124 #define __net_init __init
125 #define __net_exit __exit_refok
126 #define __net_initdata __initdata
127 #endif
129 struct pernet_operations {
130 struct list_head list;
131 int (*init)(struct net *net);
132 void (*exit)(struct net *net);
135 extern int register_pernet_subsys(struct pernet_operations *);
136 extern void unregister_pernet_subsys(struct pernet_operations *);
137 extern int register_pernet_device(struct pernet_operations *);
138 extern void unregister_pernet_device(struct pernet_operations *);
140 #endif /* __NET_NET_NAMESPACE_H */