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Eric W. Biederman5f256be2007-09-12 11:50:50 +02001/*
2 * Operations on the network namespace
3 */
4#ifndef __NET_NET_NAMESPACE_H
5#define __NET_NET_NAMESPACE_H
6
7#include <asm/atomic.h>
8#include <linux/workqueue.h>
9#include <linux/list.h>
10
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -070011#include <net/netns/core.h>
Denis V. Luneva0a53c82007-12-11 04:19:17 -080012#include <net/netns/unix.h>
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -080013#include <net/netns/packet.h>
Pavel Emelyanov8afd3512007-12-16 13:29:36 -080014#include <net/netns/ipv4.h>
Daniel Lezcanob0f159d2008-01-10 02:49:06 -080015#include <net/netns/ipv6.h>
Pavel Emelyanov67019cc2008-04-13 22:28:42 -070016#include <net/netns/dccp.h>
Alexey Dobriyan8d870052008-01-31 04:02:13 -080017#include <net/netns/x_tables.h>
Denis V. Luneva0a53c82007-12-11 04:19:17 -080018
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020019struct proc_dir_entry;
Eric W. Biederman2774c7a2007-09-26 22:10:56 -070020struct net_device;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080021struct sock;
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110022struct ctl_table_header;
Pavel Emelyanovdec827d2008-04-15 00:36:08 -070023struct net_generic;
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110024
Eric W. Biederman5f256be2007-09-12 11:50:50 +020025struct net {
26 atomic_t count; /* To decided when the network
27 * namespace should be freed.
28 */
Denis V. Lunev5d1e4462008-04-16 01:58:04 -070029#ifdef NETNS_REFCNT_DEBUG
Eric W. Biederman5f256be2007-09-12 11:50:50 +020030 atomic_t use_count; /* To track references we
31 * destroy on demand
32 */
Denis V. Lunev5d1e4462008-04-16 01:58:04 -070033#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +020034 struct list_head list; /* list of network namespaces */
35 struct work_struct work; /* work struct for freeing */
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020036
37 struct proc_dir_entry *proc_net;
38 struct proc_dir_entry *proc_net_stat;
Eric W. Biederman881d9662007-09-17 11:56:21 -070039
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110040 struct list_head sysctl_table_headers;
41
Eric W. Biederman2774c7a2007-09-26 22:10:56 -070042 struct net_device *loopback_dev; /* The loopback */
43
Eric W. Biederman881d9662007-09-17 11:56:21 -070044 struct list_head dev_base_head;
45 struct hlist_head *dev_name_head;
46 struct hlist_head *dev_index_head;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080047
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080048 /* core fib_rules */
49 struct list_head rules_ops;
50 spinlock_t rules_mod_lock;
51
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080052 struct sock *rtnl; /* rtnetlink socket */
Denis V. Lunevd12d01d2007-11-19 22:28:35 -080053
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -070054 struct netns_core core;
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -080055 struct netns_packet packet;
Denis V. Luneva0a53c82007-12-11 04:19:17 -080056 struct netns_unix unx;
Pavel Emelyanov8afd3512007-12-16 13:29:36 -080057 struct netns_ipv4 ipv4;
Daniel Lezcanob0f159d2008-01-10 02:49:06 -080058#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
59 struct netns_ipv6 ipv6;
60#endif
Pavel Emelyanov67019cc2008-04-13 22:28:42 -070061#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
62 struct netns_dccp dccp;
63#endif
Alexey Dobriyan8d870052008-01-31 04:02:13 -080064#ifdef CONFIG_NETFILTER
65 struct netns_xt xt;
66#endif
Pavel Emelyanovdec827d2008-04-15 00:36:08 -070067 struct net_generic *gen;
Eric W. Biederman5f256be2007-09-12 11:50:50 +020068};
69
Denis V. Lunev225c0a02008-04-02 00:09:29 -070070
Denis V. Lunevc0f39322008-04-02 00:10:28 -070071#include <linux/seq_file_net.h>
72
Daniel Lezcano4fabcd72007-09-13 09:16:29 +020073/* Init's network namespace */
Eric W. Biederman5f256be2007-09-12 11:50:50 +020074extern struct net init_net;
Denis V. Luneva4aa8342008-04-03 13:04:33 -070075
76#ifdef CONFIG_NET
Daniel Lezcano4fabcd72007-09-13 09:16:29 +020077#define INIT_NET_NS(net_ns) .net_ns = &init_net,
Daniel Lezcano4fabcd72007-09-13 09:16:29 +020078
Eric W. Biederman9dd776b2007-09-26 22:04:26 -070079extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
Denis V. Lunev225c0a02008-04-02 00:09:29 -070080
81#else /* CONFIG_NET */
82
83#define INIT_NET_NS(net_ns)
84
Eric W. Biederman9dd776b2007-09-26 22:04:26 -070085static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
86{
87 /* There is nothing to copy so this is a noop */
88 return net_ns;
89}
Denis V. Lunev225c0a02008-04-02 00:09:29 -070090#endif /* CONFIG_NET */
91
92
93extern struct list_head net_namespace_list;
Eric W. Biederman9dd776b2007-09-26 22:04:26 -070094
Pavel Emelyanovd4655792007-11-01 00:43:49 -070095#ifdef CONFIG_NET_NS
Eric W. Biederman5f256be2007-09-12 11:50:50 +020096extern void __put_net(struct net *net);
97
Eric W. Biedermanb9f75f42008-06-20 22:16:51 -070098static inline int net_alive(struct net *net)
99{
100 return net && atomic_read(&net->count);
101}
102
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200103static inline struct net *get_net(struct net *net)
104{
105 atomic_inc(&net->count);
106 return net;
107}
108
Eric W. Biederman077130c2007-09-13 09:18:57 +0200109static inline struct net *maybe_get_net(struct net *net)
110{
111 /* Used when we know struct net exists but we
112 * aren't guaranteed a previous reference count
113 * exists. If the reference count is zero this
114 * function fails and returns NULL.
115 */
116 if (!atomic_inc_not_zero(&net->count))
117 net = NULL;
118 return net;
119}
120
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200121static inline void put_net(struct net *net)
122{
123 if (atomic_dec_and_test(&net->count))
124 __put_net(net);
125}
126
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +0900127static inline
128int net_eq(const struct net *net1, const struct net *net2)
129{
130 return net1 == net2;
131}
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700132#else
Eric W. Biedermanb9f75f42008-06-20 22:16:51 -0700133
134static inline int net_alive(struct net *net)
135{
136 return 1;
137}
138
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700139static inline struct net *get_net(struct net *net)
140{
141 return net;
142}
143
144static inline void put_net(struct net *net)
145{
146}
147
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700148static inline struct net *maybe_get_net(struct net *net)
149{
150 return net;
151}
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +0900152
153static inline
154int net_eq(const struct net *net1, const struct net *net2)
155{
156 return 1;
157}
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700158#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200159
Denis V. Lunev5d1e4462008-04-16 01:58:04 -0700160
161#ifdef NETNS_REFCNT_DEBUG
162static inline struct net *hold_net(struct net *net)
163{
164 if (net)
165 atomic_inc(&net->use_count);
166 return net;
167}
168
169static inline void release_net(struct net *net)
170{
171 if (net)
172 atomic_dec(&net->use_count);
173}
174#else
175static inline struct net *hold_net(struct net *net)
176{
177 return net;
178}
179
180static inline void release_net(struct net *net)
181{
182}
183#endif
184
185
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200186#define for_each_net(VAR) \
187 list_for_each_entry(VAR, &net_namespace_list, list)
188
Pavel Emelyanov46650792007-10-08 20:38:39 -0700189#ifdef CONFIG_NET_NS
190#define __net_init
191#define __net_exit
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800192#define __net_initdata
Pavel Emelyanov46650792007-10-08 20:38:39 -0700193#else
194#define __net_init __init
195#define __net_exit __exit_refok
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800196#define __net_initdata __initdata
Pavel Emelyanov46650792007-10-08 20:38:39 -0700197#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200198
199struct pernet_operations {
200 struct list_head list;
201 int (*init)(struct net *net);
202 void (*exit)(struct net *net);
203};
204
205extern int register_pernet_subsys(struct pernet_operations *);
206extern void unregister_pernet_subsys(struct pernet_operations *);
207extern int register_pernet_device(struct pernet_operations *);
208extern void unregister_pernet_device(struct pernet_operations *);
Pavel Emelyanovc93cf612008-04-15 00:35:23 -0700209extern int register_pernet_gen_device(int *id, struct pernet_operations *);
210extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200211
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100212struct ctl_path;
213struct ctl_table;
214struct ctl_table_header;
215extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
216 const struct ctl_path *path, struct ctl_table *table);
217extern void unregister_net_sysctl_table(struct ctl_table_header *header);
218
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200219#endif /* __NET_NET_NAMESPACE_H */