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>
10 #include <linux/sysctl.h>
12 #include <net/netns/core.h>
13 #include <net/netns/mib.h>
14 #include <net/netns/unix.h>
15 #include <net/netns/packet.h>
16 #include <net/netns/ipv4.h>
17 #include <net/netns/ipv6.h>
18 #include <net/netns/dccp.h>
19 #include <net/netns/x_tables.h>
20 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
21 #include <net/netns/conntrack.h>
23 #include <net/netns/xfrm.h>
25 struct proc_dir_entry;
28 struct ctl_table_header;
34 #define NETDEV_HASHBITS 8
35 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
38 atomic_t count; /* To decided when the network
39 * namespace should be freed.
41 #ifdef NETNS_REFCNT_DEBUG
42 atomic_t use_count; /* To track references we
46 spinlock_t rules_mod_lock;
48 struct list_head list; /* list of network namespaces */
49 struct list_head cleanup_list; /* namespaces on death row */
50 struct list_head exit_list; /* Use only net_mutex */
52 struct proc_dir_entry *proc_net;
53 struct proc_dir_entry *proc_net_stat;
56 struct ctl_table_set sysctls;
59 struct sock *rtnl; /* rtnetlink socket */
60 struct sock *genl_sock;
62 struct list_head dev_base_head;
63 struct hlist_head *dev_name_head;
64 struct hlist_head *dev_index_head;
67 struct list_head rules_ops;
70 struct net_device *loopback_dev; /* The loopback */
71 struct netns_core core;
73 struct netns_packet packet;
74 struct netns_unix unx;
75 struct netns_ipv4 ipv4;
76 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
77 struct netns_ipv6 ipv6;
79 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
80 struct netns_dccp dccp;
82 #ifdef CONFIG_NETFILTER
84 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
88 struct sock *nfnl_stash;
90 #ifdef CONFIG_WEXT_CORE
91 struct sk_buff_head wext_nlevents;
93 struct net_generic __rcu *gen;
95 /* Note : following structs are cache line aligned */
97 struct netns_xfrm xfrm;
99 struct netns_ipvs *ipvs;
103 #include <linux/seq_file_net.h>
105 /* Init's network namespace */
106 extern struct net init_net;
109 extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
111 #else /* CONFIG_NET */
112 static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
114 /* There is nothing to copy so this is a noop */
117 #endif /* CONFIG_NET */
120 extern struct list_head net_namespace_list;
122 extern struct net *get_net_ns_by_pid(pid_t pid);
123 extern struct net *get_net_ns_by_fd(int pid);
126 extern void __put_net(struct net *net);
128 static inline struct net *get_net(struct net *net)
130 atomic_inc(&net->count);
134 static inline struct net *maybe_get_net(struct net *net)
136 /* Used when we know struct net exists but we
137 * aren't guaranteed a previous reference count
138 * exists. If the reference count is zero this
139 * function fails and returns NULL.
141 if (!atomic_inc_not_zero(&net->count))
146 static inline void put_net(struct net *net)
148 if (atomic_dec_and_test(&net->count))
153 int net_eq(const struct net *net1, const struct net *net2)
159 static inline struct net *get_net(struct net *net)
164 static inline void put_net(struct net *net)
168 static inline struct net *maybe_get_net(struct net *net)
174 int net_eq(const struct net *net1, const struct net *net2)
181 #ifdef NETNS_REFCNT_DEBUG
182 static inline struct net *hold_net(struct net *net)
185 atomic_inc(&net->use_count);
189 static inline void release_net(struct net *net)
192 atomic_dec(&net->use_count);
195 static inline struct net *hold_net(struct net *net)
200 static inline void release_net(struct net *net)
207 static inline void write_pnet(struct net **pnet, struct net *net)
212 static inline struct net *read_pnet(struct net * const *pnet)
219 #define write_pnet(pnet, net) do { (void)(net);} while (0)
220 #define read_pnet(pnet) (&init_net)
224 #define for_each_net(VAR) \
225 list_for_each_entry(VAR, &net_namespace_list, list)
227 #define for_each_net_rcu(VAR) \
228 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
233 #define __net_initdata
235 #define __net_init __init
236 #define __net_exit __exit_refok
237 #define __net_initdata __initdata
240 struct pernet_operations {
241 struct list_head list;
242 int (*init)(struct net *net);
243 void (*exit)(struct net *net);
244 void (*exit_batch)(struct list_head *net_exit_list);
250 * Use these carefully. If you implement a network device and it
251 * needs per network namespace operations use device pernet operations,
252 * otherwise use pernet subsys operations.
254 * Network interfaces need to be removed from a dying netns _before_
255 * subsys notifiers can be called, as most of the network code cleanup
256 * (which is done from subsys notifiers) runs with the assumption that
257 * dev_remove_pack has been called so no new packets will arrive during
258 * and after the cleanup functions have been called. dev_remove_pack
259 * is not per namespace so instead the guarantee of no more packets
260 * arriving in a network namespace is provided by ensuring that all
261 * network devices and all sockets have left the network namespace
262 * before the cleanup methods are called.
264 * For the longest time the ipv4 icmp code was registered as a pernet
265 * device which caused kernel oops, and panics during network
266 * namespace cleanup. So please don't get this wrong.
268 extern int register_pernet_subsys(struct pernet_operations *);
269 extern void unregister_pernet_subsys(struct pernet_operations *);
270 extern int register_pernet_device(struct pernet_operations *);
271 extern void unregister_pernet_device(struct pernet_operations *);
275 struct ctl_table_header;
277 extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
278 const struct ctl_path *path, struct ctl_table *table);
279 extern struct ctl_table_header *register_net_sysctl_rotable(
280 const struct ctl_path *path, struct ctl_table *table);
281 extern void unregister_net_sysctl_table(struct ctl_table_header *header);
283 #endif /* __NET_NET_NAMESPACE_H */