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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>
Pavel Emelyanov852566f2008-07-18 04:01:24 -070012#include <net/netns/mib.h>
Denis V. Luneva0a53c82007-12-11 04:19:17 -080013#include <net/netns/unix.h>
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -080014#include <net/netns/packet.h>
Pavel Emelyanov8afd3512007-12-16 13:29:36 -080015#include <net/netns/ipv4.h>
Daniel Lezcanob0f159d2008-01-10 02:49:06 -080016#include <net/netns/ipv6.h>
Pavel Emelyanov67019cc2008-04-13 22:28:42 -070017#include <net/netns/dccp.h>
Alexey Dobriyan8d870052008-01-31 04:02:13 -080018#include <net/netns/x_tables.h>
Alexey Dobriyandfdb8d72008-10-08 11:35:02 +020019#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
20#include <net/netns/conntrack.h>
21#endif
Alexey Dobriyand62ddc22008-11-25 17:14:31 -080022#include <net/netns/xfrm.h>
Hans Schillstrom61b1ab42011-01-03 14:44:42 +010023#include <net/netns/ip_vs.h>
Denis V. Luneva0a53c82007-12-11 04:19:17 -080024
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020025struct proc_dir_entry;
Eric W. Biederman2774c7a2007-09-26 22:10:56 -070026struct net_device;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080027struct sock;
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110028struct ctl_table_header;
Pavel Emelyanovdec827d2008-04-15 00:36:08 -070029struct net_generic;
Johannes Berg134e6372009-07-10 09:51:34 +000030struct sock;
Pavel Emelyanov1597fbc2007-12-01 23:51:01 +110031
Eric Dumazet7c28bd02009-10-24 06:13:17 -070032
33#define NETDEV_HASHBITS 8
34#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
35
Eric W. Biederman5f256be2007-09-12 11:50:50 +020036struct net {
37 atomic_t count; /* To decided when the network
38 * namespace should be freed.
39 */
Denis V. Lunev5d1e4462008-04-16 01:58:04 -070040#ifdef NETNS_REFCNT_DEBUG
Eric W. Biederman5f256be2007-09-12 11:50:50 +020041 atomic_t use_count; /* To track references we
42 * destroy on demand
43 */
Denis V. Lunev5d1e4462008-04-16 01:58:04 -070044#endif
Eric Dumazet8e602ce2010-10-14 05:56:18 +000045 spinlock_t rules_mod_lock;
46
Eric W. Biederman5f256be2007-09-12 11:50:50 +020047 struct list_head list; /* list of network namespaces */
Eric W. Biederman2b035b32009-11-29 22:25:27 +000048 struct list_head cleanup_list; /* namespaces on death row */
Eric W. Biederman72ad9372009-12-03 02:29:03 +000049 struct list_head exit_list; /* Use only net_mutex */
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020050
51 struct proc_dir_entry *proc_net;
52 struct proc_dir_entry *proc_net_stat;
Eric W. Biederman881d9662007-09-17 11:56:21 -070053
Al Viro73455092008-07-14 21:22:20 -040054#ifdef CONFIG_SYSCTL
55 struct ctl_table_set sysctls;
56#endif
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110057
Eric Dumazet8e602ce2010-10-14 05:56:18 +000058 struct sock *rtnl; /* rtnetlink socket */
59 struct sock *genl_sock;
Eric W. Biederman2774c7a2007-09-26 22:10:56 -070060
Eric W. Biederman881d9662007-09-17 11:56:21 -070061 struct list_head dev_base_head;
62 struct hlist_head *dev_name_head;
63 struct hlist_head *dev_index_head;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080064
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080065 /* core fib_rules */
66 struct list_head rules_ops;
Denis V. Lunev5fd30ee2008-01-10 03:20:28 -080067
Denis V. Lunevd12d01d2007-11-19 22:28:35 -080068
Eric Dumazet8e602ce2010-10-14 05:56:18 +000069 struct net_device *loopback_dev; /* The loopback */
Pavel Emelyanov8efa6e92008-03-31 19:41:14 -070070 struct netns_core core;
Pavel Emelyanov852566f2008-07-18 04:01:24 -070071 struct netns_mib mib;
Denis V. Lunev2aaef4e2007-12-11 04:19:54 -080072 struct netns_packet packet;
Denis V. Luneva0a53c82007-12-11 04:19:17 -080073 struct netns_unix unx;
Pavel Emelyanov8afd3512007-12-16 13:29:36 -080074 struct netns_ipv4 ipv4;
Daniel Lezcanob0f159d2008-01-10 02:49:06 -080075#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
76 struct netns_ipv6 ipv6;
77#endif
Pavel Emelyanov67019cc2008-04-13 22:28:42 -070078#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
79 struct netns_dccp dccp;
80#endif
Alexey Dobriyan8d870052008-01-31 04:02:13 -080081#ifdef CONFIG_NETFILTER
82 struct netns_xt xt;
Alexey Dobriyandfdb8d72008-10-08 11:35:02 +020083#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
84 struct netns_ct ct;
85#endif
Alexey Dobriyancd8c20b2010-01-13 16:02:14 +010086 struct sock *nfnl;
87 struct sock *nfnl_stash;
Alexey Dobriyan8d870052008-01-31 04:02:13 -080088#endif
Johannes Berg3d23e342009-09-29 23:27:28 +020089#ifdef CONFIG_WEXT_CORE
Johannes Bergb333b3d222009-06-24 01:34:48 +000090 struct sk_buff_head wext_nlevents;
91#endif
Eric Dumazet1c877332010-10-25 03:20:11 +000092 struct net_generic __rcu *gen;
Eric Dumazet8e602ce2010-10-14 05:56:18 +000093
94 /* Note : following structs are cache line aligned */
95#ifdef CONFIG_XFRM
96 struct netns_xfrm xfrm;
97#endif
Hans Schillstrom61b1ab42011-01-03 14:44:42 +010098 struct netns_ipvs *ipvs;
Eric W. Biederman5f256be2007-09-12 11:50:50 +020099};
100
Denis V. Lunev225c0a02008-04-02 00:09:29 -0700101
Denis V. Lunevc0f39322008-04-02 00:10:28 -0700102#include <linux/seq_file_net.h>
103
Daniel Lezcano4fabcd72007-09-13 09:16:29 +0200104/* Init's network namespace */
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200105extern struct net init_net;
Denis V. Luneva4aa8342008-04-03 13:04:33 -0700106
107#ifdef CONFIG_NET
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700108extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
Denis V. Lunev225c0a02008-04-02 00:09:29 -0700109
110#else /* CONFIG_NET */
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700111static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
112{
113 /* There is nothing to copy so this is a noop */
114 return net_ns;
115}
Denis V. Lunev225c0a02008-04-02 00:09:29 -0700116#endif /* CONFIG_NET */
117
118
119extern struct list_head net_namespace_list;
Eric W. Biederman9dd776b2007-09-26 22:04:26 -0700120
Johannes Berg30ffee82009-07-10 09:51:35 +0000121extern struct net *get_net_ns_by_pid(pid_t pid);
122
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700123#ifdef CONFIG_NET_NS
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200124extern void __put_net(struct net *net);
125
126static inline struct net *get_net(struct net *net)
127{
128 atomic_inc(&net->count);
129 return net;
130}
131
Eric W. Biederman077130c2007-09-13 09:18:57 +0200132static inline struct net *maybe_get_net(struct net *net)
133{
134 /* Used when we know struct net exists but we
135 * aren't guaranteed a previous reference count
136 * exists. If the reference count is zero this
137 * function fails and returns NULL.
138 */
139 if (!atomic_inc_not_zero(&net->count))
140 net = NULL;
141 return net;
142}
143
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200144static inline void put_net(struct net *net)
145{
146 if (atomic_dec_and_test(&net->count))
147 __put_net(net);
148}
149
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +0900150static inline
151int net_eq(const struct net *net1, const struct net *net2)
152{
153 return net1 == net2;
154}
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700155#else
Eric W. Biedermanb9f75f42008-06-20 22:16:51 -0700156
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700157static inline struct net *get_net(struct net *net)
158{
159 return net;
160}
161
162static inline void put_net(struct net *net)
163{
164}
165
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700166static inline struct net *maybe_get_net(struct net *net)
167{
168 return net;
169}
YOSHIFUJI Hideaki878628f2008-03-26 03:57:35 +0900170
171static inline
172int net_eq(const struct net *net1, const struct net *net2)
173{
174 return 1;
175}
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700176#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200177
Denis V. Lunev5d1e4462008-04-16 01:58:04 -0700178
179#ifdef NETNS_REFCNT_DEBUG
180static inline struct net *hold_net(struct net *net)
181{
182 if (net)
183 atomic_inc(&net->use_count);
184 return net;
185}
186
187static inline void release_net(struct net *net)
188{
189 if (net)
190 atomic_dec(&net->use_count);
191}
192#else
193static inline struct net *hold_net(struct net *net)
194{
195 return net;
196}
197
198static inline void release_net(struct net *net)
199{
200}
201#endif
202
Eric Dumazet8f424b52008-11-12 00:53:30 -0800203#ifdef CONFIG_NET_NS
204
205static inline void write_pnet(struct net **pnet, struct net *net)
206{
207 *pnet = net;
208}
209
210static inline struct net *read_pnet(struct net * const *pnet)
211{
212 return *pnet;
213}
214
215#else
216
217#define write_pnet(pnet, net) do { (void)(net);} while (0)
218#define read_pnet(pnet) (&init_net)
219
220#endif
Denis V. Lunev5d1e4462008-04-16 01:58:04 -0700221
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200222#define for_each_net(VAR) \
223 list_for_each_entry(VAR, &net_namespace_list, list)
224
Johannes Berg11a28d32009-07-10 09:51:33 +0000225#define for_each_net_rcu(VAR) \
226 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
227
Pavel Emelyanov46650792007-10-08 20:38:39 -0700228#ifdef CONFIG_NET_NS
229#define __net_init
230#define __net_exit
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800231#define __net_initdata
Pavel Emelyanov46650792007-10-08 20:38:39 -0700232#else
233#define __net_init __init
234#define __net_exit __exit_refok
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800235#define __net_initdata __initdata
Pavel Emelyanov46650792007-10-08 20:38:39 -0700236#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200237
238struct pernet_operations {
239 struct list_head list;
240 int (*init)(struct net *net);
241 void (*exit)(struct net *net);
Eric W. Biederman72ad9372009-12-03 02:29:03 +0000242 void (*exit_batch)(struct list_head *net_exit_list);
Eric W. Biedermanf875bae2009-11-29 22:25:28 +0000243 int *id;
244 size_t size;
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200245};
246
Eric W. Biederman17edde52009-02-22 00:11:09 -0800247/*
248 * Use these carefully. If you implement a network device and it
249 * needs per network namespace operations use device pernet operations,
250 * otherwise use pernet subsys operations.
251 *
Johannes Berg4edf5472009-07-15 06:16:34 +0000252 * Network interfaces need to be removed from a dying netns _before_
253 * subsys notifiers can be called, as most of the network code cleanup
254 * (which is done from subsys notifiers) runs with the assumption that
255 * dev_remove_pack has been called so no new packets will arrive during
256 * and after the cleanup functions have been called. dev_remove_pack
257 * is not per namespace so instead the guarantee of no more packets
258 * arriving in a network namespace is provided by ensuring that all
259 * network devices and all sockets have left the network namespace
260 * before the cleanup methods are called.
Eric W. Biederman17edde52009-02-22 00:11:09 -0800261 *
262 * For the longest time the ipv4 icmp code was registered as a pernet
263 * device which caused kernel oops, and panics during network
264 * namespace cleanup. So please don't get this wrong.
265 */
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200266extern int register_pernet_subsys(struct pernet_operations *);
267extern void unregister_pernet_subsys(struct pernet_operations *);
268extern int register_pernet_device(struct pernet_operations *);
269extern void unregister_pernet_device(struct pernet_operations *);
Eric W. Biedermanf875bae2009-11-29 22:25:28 +0000270
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100271struct ctl_path;
272struct ctl_table;
273struct ctl_table_header;
Pavel Emelyanovd62c6122008-05-19 13:45:33 -0700274
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100275extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
276 const struct ctl_path *path, struct ctl_table *table);
Pavel Emelyanovd62c6122008-05-19 13:45:33 -0700277extern struct ctl_table_header *register_net_sysctl_rotable(
278 const struct ctl_path *path, struct ctl_table *table);
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100279extern void unregister_net_sysctl_table(struct ctl_table_header *header);
280
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200281#endif /* __NET_NET_NAMESPACE_H */