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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
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020011struct proc_dir_entry;
Eric W. Biederman2774c7a2007-09-26 22:10:56 -070012struct net_device;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080013struct sock;
Eric W. Biederman5f256be2007-09-12 11:50:50 +020014struct net {
15 atomic_t count; /* To decided when the network
16 * namespace should be freed.
17 */
18 atomic_t use_count; /* To track references we
19 * destroy on demand
20 */
21 struct list_head list; /* list of network namespaces */
22 struct work_struct work; /* work struct for freeing */
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020023
24 struct proc_dir_entry *proc_net;
25 struct proc_dir_entry *proc_net_stat;
26 struct proc_dir_entry *proc_net_root;
Eric W. Biederman881d9662007-09-17 11:56:21 -070027
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +110028 struct list_head sysctl_table_headers;
29
Eric W. Biederman2774c7a2007-09-26 22:10:56 -070030 struct net_device *loopback_dev; /* The loopback */
31
Eric W. Biederman881d9662007-09-17 11:56:21 -070032 struct list_head dev_base_head;
33 struct hlist_head *dev_name_head;
34 struct hlist_head *dev_index_head;
Denis V. Lunev97c53ca2007-11-19 22:26:51 -080035
36 struct sock *rtnl; /* rtnetlink socket */
Denis V. Lunevd12d01d2007-11-19 22:28:35 -080037
38 /* List of all packet sockets. */
39 rwlock_t packet_sklist_lock;
40 struct hlist_head packet_sklist;
Eric W. Biederman5f256be2007-09-12 11:50:50 +020041};
42
Daniel Lezcano4fabcd72007-09-13 09:16:29 +020043#ifdef CONFIG_NET
44/* Init's network namespace */
Eric W. Biederman5f256be2007-09-12 11:50:50 +020045extern struct net init_net;
Daniel Lezcano4fabcd72007-09-13 09:16:29 +020046#define INIT_NET_NS(net_ns) .net_ns = &init_net,
47#else
48#define INIT_NET_NS(net_ns)
49#endif
50
Eric W. Biederman5f256be2007-09-12 11:50:50 +020051extern struct list_head net_namespace_list;
52
Eric W. Biederman9dd776b2007-09-26 22:04:26 -070053#ifdef CONFIG_NET
54extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
55#else
56static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
57{
58 /* There is nothing to copy so this is a noop */
59 return net_ns;
60}
61#endif
62
Pavel Emelyanovd4655792007-11-01 00:43:49 -070063#ifdef CONFIG_NET_NS
Eric W. Biederman5f256be2007-09-12 11:50:50 +020064extern void __put_net(struct net *net);
65
66static inline struct net *get_net(struct net *net)
67{
68 atomic_inc(&net->count);
69 return net;
70}
71
Eric W. Biederman077130c2007-09-13 09:18:57 +020072static inline struct net *maybe_get_net(struct net *net)
73{
74 /* Used when we know struct net exists but we
75 * aren't guaranteed a previous reference count
76 * exists. If the reference count is zero this
77 * function fails and returns NULL.
78 */
79 if (!atomic_inc_not_zero(&net->count))
80 net = NULL;
81 return net;
82}
83
Eric W. Biederman5f256be2007-09-12 11:50:50 +020084static inline void put_net(struct net *net)
85{
86 if (atomic_dec_and_test(&net->count))
87 __put_net(net);
88}
89
90static inline struct net *hold_net(struct net *net)
91{
92 atomic_inc(&net->use_count);
93 return net;
94}
95
96static inline void release_net(struct net *net)
97{
98 atomic_dec(&net->use_count);
Eric W. Biederman5f256be2007-09-12 11:50:50 +020099}
Pavel Emelyanovd4655792007-11-01 00:43:49 -0700100#else
101static inline struct net *get_net(struct net *net)
102{
103 return net;
104}
105
106static inline void put_net(struct net *net)
107{
108}
109
110static inline struct net *hold_net(struct net *net)
111{
112 return net;
113}
114
115static inline void release_net(struct net *net)
116{
117}
118
119static inline struct net *maybe_get_net(struct net *net)
120{
121 return net;
122}
123#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200124
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200125#define for_each_net(VAR) \
126 list_for_each_entry(VAR, &net_namespace_list, list)
127
Pavel Emelyanov46650792007-10-08 20:38:39 -0700128#ifdef CONFIG_NET_NS
129#define __net_init
130#define __net_exit
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800131#define __net_initdata
Pavel Emelyanov46650792007-10-08 20:38:39 -0700132#else
133#define __net_init __init
134#define __net_exit __exit_refok
Denis V. Lunev022cbae2007-11-13 03:23:50 -0800135#define __net_initdata __initdata
Pavel Emelyanov46650792007-10-08 20:38:39 -0700136#endif
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200137
138struct pernet_operations {
139 struct list_head list;
140 int (*init)(struct net *net);
141 void (*exit)(struct net *net);
142};
143
144extern int register_pernet_subsys(struct pernet_operations *);
145extern void unregister_pernet_subsys(struct pernet_operations *);
146extern int register_pernet_device(struct pernet_operations *);
147extern void unregister_pernet_device(struct pernet_operations *);
148
Eric W. Biederman95bdfcc2007-11-30 23:55:42 +1100149struct ctl_path;
150struct ctl_table;
151struct ctl_table_header;
152extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
153 const struct ctl_path *path, struct ctl_table *table);
154extern void unregister_net_sysctl_table(struct ctl_table_header *header);
155
Eric W. Biederman5f256be2007-09-12 11:50:50 +0200156#endif /* __NET_NET_NAMESPACE_H */