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
;
15 atomic_t count
; /* To decided when the network
16 * namespace should be freed.
18 atomic_t use_count
; /* To track references we
21 struct list_head list
; /* list of network namespaces */
22 struct work_struct work
; /* work struct for freeing */
24 struct proc_dir_entry
*proc_net
;
25 struct proc_dir_entry
*proc_net_stat
;
26 struct proc_dir_entry
*proc_net_root
;
28 struct list_head sysctl_table_headers
;
30 struct net_device
*loopback_dev
; /* The loopback */
32 struct list_head dev_base_head
;
33 struct hlist_head
*dev_name_head
;
34 struct hlist_head
*dev_index_head
;
36 struct sock
*rtnl
; /* rtnetlink socket */
38 /* List of all packet sockets. */
39 rwlock_t packet_sklist_lock
;
40 struct hlist_head packet_sklist
;
44 /* Init's network namespace */
45 extern struct net init_net
;
46 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
48 #define INIT_NET_NS(net_ns)
51 extern struct list_head net_namespace_list
;
54 extern struct net
*copy_net_ns(unsigned long flags
, struct net
*net_ns
);
56 static inline struct net
*copy_net_ns(unsigned long flags
, struct net
*net_ns
)
58 /* There is nothing to copy so this is a noop */
64 extern void __put_net(struct net
*net
);
66 static inline struct net
*get_net(struct net
*net
)
68 atomic_inc(&net
->count
);
72 static inline struct net
*maybe_get_net(struct net
*net
)
74 /* Used when we know struct net exists but we
75 * aren't guaranteed a previous reference count
76 * exists. If the reference count is zero this
77 * function fails and returns NULL.
79 if (!atomic_inc_not_zero(&net
->count
))
84 static inline void put_net(struct net
*net
)
86 if (atomic_dec_and_test(&net
->count
))
90 static inline struct net
*hold_net(struct net
*net
)
92 atomic_inc(&net
->use_count
);
96 static inline void release_net(struct net
*net
)
98 atomic_dec(&net
->use_count
);
101 static inline struct net
*get_net(struct net
*net
)
106 static inline void put_net(struct net
*net
)
110 static inline struct net
*hold_net(struct net
*net
)
115 static inline void release_net(struct net
*net
)
119 static inline struct net
*maybe_get_net(struct net
*net
)
125 #define for_each_net(VAR) \
126 list_for_each_entry(VAR, &net_namespace_list, list)
131 #define __net_initdata
133 #define __net_init __init
134 #define __net_exit __exit_refok
135 #define __net_initdata __initdata
138 struct pernet_operations
{
139 struct list_head list
;
140 int (*init
)(struct net
*net
);
141 void (*exit
)(struct net
*net
);
144 extern int register_pernet_subsys(struct pernet_operations
*);
145 extern void unregister_pernet_subsys(struct pernet_operations
*);
146 extern int register_pernet_device(struct pernet_operations
*);
147 extern void unregister_pernet_device(struct pernet_operations
*);
151 struct ctl_table_header
;
152 extern struct ctl_table_header
*register_net_sysctl_table(struct net
*net
,
153 const struct ctl_path
*path
, struct ctl_table
*table
);
154 extern void unregister_net_sysctl_table(struct ctl_table_header
*header
);
156 #endif /* __NET_NET_NAMESPACE_H */