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>
16 struct proc_dir_entry;
19 struct ctl_table_header;
22 atomic_t count; /* To decided when the network
23 * namespace should be freed.
25 atomic_t use_count; /* To track references we
28 struct list_head list; /* list of network namespaces */
29 struct work_struct work; /* work struct for freeing */
31 struct proc_dir_entry *proc_net;
32 struct proc_dir_entry *proc_net_stat;
33 struct proc_dir_entry *proc_net_root;
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;
62 /* Init's network namespace */
63 extern struct net init_net;
64 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
66 #define INIT_NET_NS(net_ns)
69 extern struct list_head net_namespace_list;
72 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
74 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
76 /* There is nothing to copy so this is a noop */
82 extern void __put_net(struct net *net);
84 static inline struct net *get_net(struct net *net)
86 atomic_inc(&net->count);
90 static inline struct net *maybe_get_net(struct net *net)
92 /* Used when we know struct net exists but we
93 * aren't guaranteed a previous reference count
94 * exists. If the reference count is zero this
95 * function fails and returns NULL.
97 if (!atomic_inc_not_zero(&net->count))
102 static inline void put_net(struct net *net)
104 if (atomic_dec_and_test(&net->count))
108 static inline struct net *hold_net(struct net *net)
110 atomic_inc(&net->use_count);
114 static inline void release_net(struct net *net)
116 atomic_dec(&net->use_count);
119 static inline struct net *get_net(struct net *net)
124 static inline void put_net(struct net *net)
128 static inline struct net *hold_net(struct net *net)
133 static inline void release_net(struct net *net)
137 static inline struct net *maybe_get_net(struct net *net)
143 #define for_each_net(VAR) \
144 list_for_each_entry(VAR, &net_namespace_list, list)
149 #define __net_initdata
151 #define __net_init __init
152 #define __net_exit __exit_refok
153 #define __net_initdata __initdata
156 struct pernet_operations {
157 struct list_head list;
158 int (*init)(struct net *net);
159 void (*exit)(struct net *net);
162 extern int register_pernet_subsys(struct pernet_operations *);
163 extern void unregister_pernet_subsys(struct pernet_operations *);
164 extern int register_pernet_device(struct pernet_operations *);
165 extern void unregister_pernet_device(struct pernet_operations *);
169 struct ctl_table_header;
170 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
171 const struct ctl_path *path, struct ctl_table *table);
172 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
174 #endif /* __NET_NET_NAMESPACE_H */