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 #include <net/netns/core.h>
12 #include <net/netns/unix.h>
13 #include <net/netns/packet.h>
14 #include <net/netns/ipv4.h>
15 #include <net/netns/ipv6.h>
16 #include <net/netns/x_tables.h>
18 struct proc_dir_entry
;
21 struct ctl_table_header
;
24 atomic_t count
; /* To decided when the network
25 * namespace should be freed.
27 atomic_t use_count
; /* To track references we
30 struct list_head list
; /* list of network namespaces */
31 struct work_struct work
; /* work struct for freeing */
33 struct proc_dir_entry
*proc_net
;
34 struct proc_dir_entry
*proc_net_stat
;
36 struct list_head sysctl_table_headers
;
38 struct net_device
*loopback_dev
; /* The loopback */
40 struct list_head dev_base_head
;
41 struct hlist_head
*dev_name_head
;
42 struct hlist_head
*dev_index_head
;
45 struct list_head rules_ops
;
46 spinlock_t rules_mod_lock
;
48 struct sock
*rtnl
; /* rtnetlink socket */
50 struct netns_core core
;
51 struct netns_packet packet
;
52 struct netns_unix unx
;
53 struct netns_ipv4 ipv4
;
54 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
55 struct netns_ipv6 ipv6
;
57 #ifdef CONFIG_NETFILTER
63 #include <linux/seq_file_net.h>
65 /* Init's network namespace */
66 extern struct net init_net
;
69 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
71 extern struct net
*copy_net_ns(unsigned long flags
, struct net
*net_ns
);
73 #else /* CONFIG_NET */
75 #define INIT_NET_NS(net_ns)
77 static inline struct net
*copy_net_ns(unsigned long flags
, struct net
*net_ns
)
79 /* There is nothing to copy so this is a noop */
82 #endif /* CONFIG_NET */
85 extern struct list_head net_namespace_list
;
88 extern void __put_net(struct net
*net
);
90 static inline struct net
*get_net(struct net
*net
)
92 atomic_inc(&net
->count
);
96 static inline struct net
*maybe_get_net(struct net
*net
)
98 /* Used when we know struct net exists but we
99 * aren't guaranteed a previous reference count
100 * exists. If the reference count is zero this
101 * function fails and returns NULL.
103 if (!atomic_inc_not_zero(&net
->count
))
108 static inline void put_net(struct net
*net
)
110 if (atomic_dec_and_test(&net
->count
))
114 static inline struct net
*hold_net(struct net
*net
)
116 atomic_inc(&net
->use_count
);
120 static inline void release_net(struct net
*net
)
122 atomic_dec(&net
->use_count
);
126 int net_eq(const struct net
*net1
, const struct net
*net2
)
131 static inline struct net
*get_net(struct net
*net
)
136 static inline void put_net(struct net
*net
)
140 static inline struct net
*hold_net(struct net
*net
)
145 static inline void release_net(struct net
*net
)
149 static inline struct net
*maybe_get_net(struct net
*net
)
155 int net_eq(const struct net
*net1
, const struct net
*net2
)
161 #define for_each_net(VAR) \
162 list_for_each_entry(VAR, &net_namespace_list, list)
167 #define __net_initdata
169 #define __net_init __init
170 #define __net_exit __exit_refok
171 #define __net_initdata __initdata
174 struct pernet_operations
{
175 struct list_head list
;
176 int (*init
)(struct net
*net
);
177 void (*exit
)(struct net
*net
);
180 extern int register_pernet_subsys(struct pernet_operations
*);
181 extern void unregister_pernet_subsys(struct pernet_operations
*);
182 extern int register_pernet_device(struct pernet_operations
*);
183 extern void unregister_pernet_device(struct pernet_operations
*);
187 struct ctl_table_header
;
188 extern struct ctl_table_header
*register_net_sysctl_table(struct net
*net
,
189 const struct ctl_path
*path
, struct ctl_table
*table
);
190 extern void unregister_net_sysctl_table(struct ctl_table_header
*header
);
192 #endif /* __NET_NET_NAMESPACE_H */