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/unix.h>
12 #include <net/netns/packet.h>
13 #include <net/netns/ipv4.h>
14 #include <net/netns/ipv6.h>
15 #include <net/netns/x_tables.h>
17 struct proc_dir_entry;
20 struct ctl_table_header;
23 atomic_t count; /* To decided when the network
24 * namespace should be freed.
26 atomic_t use_count; /* To track references we
29 struct list_head list; /* list of network namespaces */
30 struct work_struct work; /* work struct for freeing */
32 struct proc_dir_entry *proc_net;
33 struct proc_dir_entry *proc_net_stat;
35 struct list_head sysctl_table_headers;
37 struct net_device *loopback_dev; /* The loopback */
39 struct list_head dev_base_head;
40 struct hlist_head *dev_name_head;
41 struct hlist_head *dev_index_head;
44 struct list_head rules_ops;
45 spinlock_t rules_mod_lock;
47 struct sock *rtnl; /* rtnetlink socket */
50 struct ctl_table_header *sysctl_core_hdr;
53 struct netns_packet packet;
54 struct netns_unix unx;
55 struct netns_ipv4 ipv4;
56 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
57 struct netns_ipv6 ipv6;
59 #ifdef CONFIG_NETFILTER
65 /* Init's network namespace */
66 extern struct net init_net;
67 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
69 #define INIT_NET_NS(net_ns)
72 extern struct list_head net_namespace_list;
75 extern struct net *copy_net_ns(unsigned long flags, struct net *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 */
85 extern void __put_net(struct net *net);
87 static inline struct net *get_net(struct net *net)
89 atomic_inc(&net->count);
93 static inline struct net *maybe_get_net(struct net *net)
95 /* Used when we know struct net exists but we
96 * aren't guaranteed a previous reference count
97 * exists. If the reference count is zero this
98 * function fails and returns NULL.
100 if (!atomic_inc_not_zero(&net->count))
105 static inline void put_net(struct net *net)
107 if (atomic_dec_and_test(&net->count))
111 static inline struct net *hold_net(struct net *net)
113 atomic_inc(&net->use_count);
117 static inline void release_net(struct net *net)
119 atomic_dec(&net->use_count);
122 static inline struct net *get_net(struct net *net)
127 static inline void put_net(struct net *net)
131 static inline struct net *hold_net(struct net *net)
136 static inline void release_net(struct net *net)
140 static inline struct net *maybe_get_net(struct net *net)
146 #define for_each_net(VAR) \
147 list_for_each_entry(VAR, &net_namespace_list, list)
152 #define __net_initdata
154 #define __net_init __init
155 #define __net_exit __exit_refok
156 #define __net_initdata __initdata
159 struct pernet_operations {
160 struct list_head list;
161 int (*init)(struct net *net);
162 void (*exit)(struct net *net);
165 extern int register_pernet_subsys(struct pernet_operations *);
166 extern void unregister_pernet_subsys(struct pernet_operations *);
167 extern int register_pernet_device(struct pernet_operations *);
168 extern void unregister_pernet_device(struct pernet_operations *);
172 struct ctl_table_header;
173 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
174 const struct ctl_path *path, struct ctl_table *table);
175 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
177 #endif /* __NET_NET_NAMESPACE_H */