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 #define NETDEV_HASHBITS 8
33 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
36 atomic_t count; /* To decided when the network
37 * namespace should be freed.
39 #ifdef NETNS_REFCNT_DEBUG
40 atomic_t use_count; /* To track references we
44 struct list_head list; /* list of network namespaces */
45 struct list_head cleanup_list; /* namespaces on death row */
46 struct list_head exit_list; /* Use only net_mutex */
48 struct proc_dir_entry *proc_net;
49 struct proc_dir_entry *proc_net_stat;
52 struct ctl_table_set sysctls;
55 struct net_device *loopback_dev; /* The loopback */
57 struct list_head dev_base_head;
58 struct hlist_head *dev_name_head;
59 struct hlist_head *dev_index_head;
62 struct list_head rules_ops;
63 spinlock_t rules_mod_lock;
65 struct sock *rtnl; /* rtnetlink socket */
66 struct sock *genl_sock;
68 struct netns_core core;
70 struct netns_packet packet;
71 struct netns_unix unx;
72 struct netns_ipv4 ipv4;
73 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
74 struct netns_ipv6 ipv6;
76 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
77 struct netns_dccp dccp;
79 #ifdef CONFIG_NETFILTER
81 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
85 struct sock *nfnl_stash;
88 struct netns_xfrm xfrm;
90 #ifdef CONFIG_WEXT_CORE
91 struct sk_buff_head wext_nlevents;
93 struct net_generic *gen;
97 #include <linux/seq_file_net.h>
99 /* Init's network namespace */
100 extern struct net init_net;
103 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
105 #else /* CONFIG_NET */
106 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
108 /* There is nothing to copy so this is a noop */
111 #endif /* CONFIG_NET */
114 extern struct list_head net_namespace_list;
116 extern struct net *get_net_ns_by_pid(pid_t pid);
119 extern void __put_net(struct net *net);
121 static inline struct net *get_net(struct net *net)
123 atomic_inc(&net->count);
127 static inline struct net *maybe_get_net(struct net *net)
129 /* Used when we know struct net exists but we
130 * aren't guaranteed a previous reference count
131 * exists. If the reference count is zero this
132 * function fails and returns NULL.
134 if (!atomic_inc_not_zero(&net->count))
139 static inline void put_net(struct net *net)
141 if (atomic_dec_and_test(&net->count))
146 int net_eq(const struct net *net1, const struct net *net2)
152 static inline struct net *get_net(struct net *net)
157 static inline void put_net(struct net *net)
161 static inline struct net *maybe_get_net(struct net *net)
167 int net_eq(const struct net *net1, const struct net *net2)
174 #ifdef NETNS_REFCNT_DEBUG
175 static inline struct net *hold_net(struct net *net)
178 atomic_inc(&net->use_count);
182 static inline void release_net(struct net *net)
185 atomic_dec(&net->use_count);
188 static inline struct net *hold_net(struct net *net)
193 static inline void release_net(struct net *net)
200 static inline void write_pnet(struct net **pnet, struct net *net)
205 static inline struct net *read_pnet(struct net * const *pnet)
212 #define write_pnet(pnet, net) do { (void)(net);} while (0)
213 #define read_pnet(pnet) (&init_net)
217 #define for_each_net(VAR) \
218 list_for_each_entry(VAR, &net_namespace_list, list)
220 #define for_each_net_rcu(VAR) \
221 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
226 #define __net_initdata
228 #define __net_init __init
229 #define __net_exit __exit_refok
230 #define __net_initdata __initdata
233 struct pernet_operations {
234 struct list_head list;
235 int (*init)(struct net *net);
236 void (*exit)(struct net *net);
237 void (*exit_batch)(struct list_head *net_exit_list);
243 * Use these carefully. If you implement a network device and it
244 * needs per network namespace operations use device pernet operations,
245 * otherwise use pernet subsys operations.
247 * Network interfaces need to be removed from a dying netns _before_
248 * subsys notifiers can be called, as most of the network code cleanup
249 * (which is done from subsys notifiers) runs with the assumption that
250 * dev_remove_pack has been called so no new packets will arrive during
251 * and after the cleanup functions have been called. dev_remove_pack
252 * is not per namespace so instead the guarantee of no more packets
253 * arriving in a network namespace is provided by ensuring that all
254 * network devices and all sockets have left the network namespace
255 * before the cleanup methods are called.
257 * For the longest time the ipv4 icmp code was registered as a pernet
258 * device which caused kernel oops, and panics during network
259 * namespace cleanup. So please don't get this wrong.
261 extern int register_pernet_subsys(struct pernet_operations *);
262 extern void unregister_pernet_subsys(struct pernet_operations *);
263 extern int register_pernet_device(struct pernet_operations *);
264 extern void unregister_pernet_device(struct pernet_operations *);
268 struct ctl_table_header;
270 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
271 const struct ctl_path *path, struct ctl_table *table);
272 extern struct ctl_table_header *register_net_sysctl_rotable(
273 const struct ctl_path *path, struct ctl_table *table);
274 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
276 #endif /* __NET_NET_NAMESPACE_H */