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/mib.h>
13 #include <net/netns/unix.h>
14 #include <net/netns/packet.h>
15 #include <net/netns/ipv4.h>
16 #include <net/netns/ipv6.h>
17 #include <net/netns/dccp.h>
18 #include <net/netns/x_tables.h>
19 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
20 #include <net/netns/conntrack.h>
22 #include <net/netns/xfrm.h>
24 struct proc_dir_entry;
27 struct ctl_table_header;
32 atomic_t count; /* To decided when the network
33 * namespace should be freed.
35 #ifdef NETNS_REFCNT_DEBUG
36 atomic_t use_count; /* To track references we
40 struct list_head list; /* list of network namespaces */
41 struct work_struct work; /* work struct for freeing */
43 struct proc_dir_entry *proc_net;
44 struct proc_dir_entry *proc_net_stat;
47 struct ctl_table_set sysctls;
50 struct net_device *loopback_dev; /* The loopback */
52 struct list_head dev_base_head;
53 struct hlist_head *dev_name_head;
54 struct hlist_head *dev_index_head;
57 struct list_head rules_ops;
58 spinlock_t rules_mod_lock;
60 struct sock *rtnl; /* rtnetlink socket */
61 struct sock *genl_sock;
63 struct netns_core core;
65 struct netns_packet packet;
66 struct netns_unix unx;
67 struct netns_ipv4 ipv4;
68 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
69 struct netns_ipv6 ipv6;
71 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
72 struct netns_dccp dccp;
74 #ifdef CONFIG_NETFILTER
76 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
81 struct netns_xfrm xfrm;
83 #ifdef CONFIG_WIRELESS_EXT
84 struct sk_buff_head wext_nlevents;
86 struct net_generic *gen;
90 #include <linux/seq_file_net.h>
92 /* Init's network namespace */
93 extern struct net init_net;
96 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
98 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
100 #else /* CONFIG_NET */
102 #define INIT_NET_NS(net_ns)
104 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
106 /* There is nothing to copy so this is a noop */
109 #endif /* CONFIG_NET */
112 extern struct list_head net_namespace_list;
114 extern struct net *get_net_ns_by_pid(pid_t pid);
117 extern void __put_net(struct net *net);
119 static inline struct net *get_net(struct net *net)
121 atomic_inc(&net->count);
125 static inline struct net *maybe_get_net(struct net *net)
127 /* Used when we know struct net exists but we
128 * aren't guaranteed a previous reference count
129 * exists. If the reference count is zero this
130 * function fails and returns NULL.
132 if (!atomic_inc_not_zero(&net->count))
137 static inline void put_net(struct net *net)
139 if (atomic_dec_and_test(&net->count))
144 int net_eq(const struct net *net1, const struct net *net2)
150 static inline struct net *get_net(struct net *net)
155 static inline void put_net(struct net *net)
159 static inline struct net *maybe_get_net(struct net *net)
165 int net_eq(const struct net *net1, const struct net *net2)
172 #ifdef NETNS_REFCNT_DEBUG
173 static inline struct net *hold_net(struct net *net)
176 atomic_inc(&net->use_count);
180 static inline void release_net(struct net *net)
183 atomic_dec(&net->use_count);
186 static inline struct net *hold_net(struct net *net)
191 static inline void release_net(struct net *net)
198 static inline void write_pnet(struct net **pnet, struct net *net)
203 static inline struct net *read_pnet(struct net * const *pnet)
210 #define write_pnet(pnet, net) do { (void)(net);} while (0)
211 #define read_pnet(pnet) (&init_net)
215 #define for_each_net(VAR) \
216 list_for_each_entry(VAR, &net_namespace_list, list)
218 #define for_each_net_rcu(VAR) \
219 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
224 #define __net_initdata
226 #define __net_init __init
227 #define __net_exit __exit_refok
228 #define __net_initdata __initdata
231 struct pernet_operations {
232 struct list_head list;
233 int (*init)(struct net *net);
234 void (*exit)(struct net *net);
238 * Use these carefully. If you implement a network device and it
239 * needs per network namespace operations use device pernet operations,
240 * otherwise use pernet subsys operations.
242 * Network interfaces need to be removed from a dying netns _before_
243 * subsys notifiers can be called, as most of the network code cleanup
244 * (which is done from subsys notifiers) runs with the assumption that
245 * dev_remove_pack has been called so no new packets will arrive during
246 * and after the cleanup functions have been called. dev_remove_pack
247 * is not per namespace so instead the guarantee of no more packets
248 * arriving in a network namespace is provided by ensuring that all
249 * network devices and all sockets have left the network namespace
250 * before the cleanup methods are called.
252 * For the longest time the ipv4 icmp code was registered as a pernet
253 * device which caused kernel oops, and panics during network
254 * namespace cleanup. So please don't get this wrong.
256 extern int register_pernet_subsys(struct pernet_operations *);
257 extern void unregister_pernet_subsys(struct pernet_operations *);
258 extern int register_pernet_gen_subsys(int *id, struct pernet_operations *);
259 extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *);
260 extern int register_pernet_device(struct pernet_operations *);
261 extern void unregister_pernet_device(struct pernet_operations *);
262 extern int register_pernet_gen_device(int *id, struct pernet_operations *);
263 extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
267 struct ctl_table_header;
269 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
270 const struct ctl_path *path, struct ctl_table *table);
271 extern struct ctl_table_header *register_net_sysctl_rotable(
272 const struct ctl_path *path, struct ctl_table *table);
273 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
275 #endif /* __NET_NET_NAMESPACE_H */