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 struct net_generic *gen;
87 #include <linux/seq_file_net.h>
89 /* Init's network namespace */
90 extern struct net init_net;
93 #define INIT_NET_NS(net_ns) .net_ns = &init_net,
95 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
97 #else /* CONFIG_NET */
99 #define INIT_NET_NS(net_ns)
101 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
103 /* There is nothing to copy so this is a noop */
106 #endif /* CONFIG_NET */
109 extern struct list_head net_namespace_list;
112 extern void __put_net(struct net *net);
114 static inline struct net *get_net(struct net *net)
116 atomic_inc(&net->count);
120 static inline struct net *maybe_get_net(struct net *net)
122 /* Used when we know struct net exists but we
123 * aren't guaranteed a previous reference count
124 * exists. If the reference count is zero this
125 * function fails and returns NULL.
127 if (!atomic_inc_not_zero(&net->count))
132 static inline void put_net(struct net *net)
134 if (atomic_dec_and_test(&net->count))
139 int net_eq(const struct net *net1, const struct net *net2)
145 static inline struct net *get_net(struct net *net)
150 static inline void put_net(struct net *net)
154 static inline struct net *maybe_get_net(struct net *net)
160 int net_eq(const struct net *net1, const struct net *net2)
167 #ifdef NETNS_REFCNT_DEBUG
168 static inline struct net *hold_net(struct net *net)
171 atomic_inc(&net->use_count);
175 static inline void release_net(struct net *net)
178 atomic_dec(&net->use_count);
181 static inline struct net *hold_net(struct net *net)
186 static inline void release_net(struct net *net)
193 static inline void write_pnet(struct net **pnet, struct net *net)
198 static inline struct net *read_pnet(struct net * const *pnet)
205 #define write_pnet(pnet, net) do { (void)(net);} while (0)
206 #define read_pnet(pnet) (&init_net)
210 #define for_each_net(VAR) \
211 list_for_each_entry(VAR, &net_namespace_list, list)
213 #define for_each_net_rcu(VAR) \
214 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
219 #define __net_initdata
221 #define __net_init __init
222 #define __net_exit __exit_refok
223 #define __net_initdata __initdata
226 struct pernet_operations {
227 struct list_head list;
228 int (*init)(struct net *net);
229 void (*exit)(struct net *net);
233 * Use these carefully. If you implement a network device and it
234 * needs per network namespace operations use device pernet operations,
235 * otherwise use pernet subsys operations.
237 * This is critically important. Most of the network code cleanup
238 * runs with the assumption that dev_remove_pack has been called so no
239 * new packets will arrive during and after the cleanup functions have
240 * been called. dev_remove_pack is not per namespace so instead the
241 * guarantee of no more packets arriving in a network namespace is
242 * provided by ensuring that all network devices and all sockets have
243 * left the network namespace before the cleanup methods are called.
245 * For the longest time the ipv4 icmp code was registered as a pernet
246 * device which caused kernel oops, and panics during network
247 * namespace cleanup. So please don't get this wrong.
249 extern int register_pernet_subsys(struct pernet_operations *);
250 extern void unregister_pernet_subsys(struct pernet_operations *);
251 extern int register_pernet_gen_subsys(int *id, struct pernet_operations *);
252 extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *);
253 extern int register_pernet_device(struct pernet_operations *);
254 extern void unregister_pernet_device(struct pernet_operations *);
255 extern int register_pernet_gen_device(int *id, struct pernet_operations *);
256 extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
260 struct ctl_table_header;
262 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
263 const struct ctl_path *path, struct ctl_table *table);
264 extern struct ctl_table_header *register_net_sysctl_rotable(
265 const struct ctl_path *path, struct ctl_table *table);
266 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
268 #endif /* __NET_NET_NAMESPACE_H */