Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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kernel
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linux
1/*
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
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
20struct proc_dir_entry;
21struct net_device;
22struct sock;
23struct ctl_table_header;
24struct net_generic;
25
26struct net {
27 atomic_t count; /* To decided when the network
28 * namespace should be freed.
29 */
30#ifdef NETNS_REFCNT_DEBUG
31 atomic_t use_count; /* To track references we
32 * destroy on demand
33 */
34#endif
35 struct list_head list; /* list of network namespaces */
36 struct work_struct work; /* work struct for freeing */
37
38 struct proc_dir_entry *proc_net;
39 struct proc_dir_entry *proc_net_stat;
40
41#ifdef CONFIG_SYSCTL
42 struct ctl_table_set sysctls;
43#endif
44
45 struct net_device *loopback_dev; /* The loopback */
46
47 struct list_head dev_base_head;
48 struct hlist_head *dev_name_head;
49 struct hlist_head *dev_index_head;
50
51 /* core fib_rules */
52 struct list_head rules_ops;
53 spinlock_t rules_mod_lock;
54
55 struct sock *rtnl; /* rtnetlink socket */
56
57 struct netns_core core;
58 struct netns_mib mib;
59 struct netns_packet packet;
60 struct netns_unix unx;
61 struct netns_ipv4 ipv4;
62#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
63 struct netns_ipv6 ipv6;
64#endif
65#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
66 struct netns_dccp dccp;
67#endif
68#ifdef CONFIG_NETFILTER
69 struct netns_xt xt;
70#endif
71 struct net_generic *gen;
72};
73
74
75#include <linux/seq_file_net.h>
76
77/* Init's network namespace */
78extern struct net init_net;
79
80#ifdef CONFIG_NET
81#define INIT_NET_NS(net_ns) .net_ns = &init_net,
82
83extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
84
85#else /* CONFIG_NET */
86
87#define INIT_NET_NS(net_ns)
88
89static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
90{
91 /* There is nothing to copy so this is a noop */
92 return net_ns;
93}
94#endif /* CONFIG_NET */
95
96
97extern struct list_head net_namespace_list;
98
99#ifdef CONFIG_NET_NS
100extern void __put_net(struct net *net);
101
102static inline int net_alive(struct net *net)
103{
104 return net && atomic_read(&net->count);
105}
106
107static inline struct net *get_net(struct net *net)
108{
109 atomic_inc(&net->count);
110 return net;
111}
112
113static inline struct net *maybe_get_net(struct net *net)
114{
115 /* Used when we know struct net exists but we
116 * aren't guaranteed a previous reference count
117 * exists. If the reference count is zero this
118 * function fails and returns NULL.
119 */
120 if (!atomic_inc_not_zero(&net->count))
121 net = NULL;
122 return net;
123}
124
125static inline void put_net(struct net *net)
126{
127 if (atomic_dec_and_test(&net->count))
128 __put_net(net);
129}
130
131static inline
132int net_eq(const struct net *net1, const struct net *net2)
133{
134 return net1 == net2;
135}
136#else
137
138static inline int net_alive(struct net *net)
139{
140 return 1;
141}
142
143static inline struct net *get_net(struct net *net)
144{
145 return net;
146}
147
148static inline void put_net(struct net *net)
149{
150}
151
152static inline struct net *maybe_get_net(struct net *net)
153{
154 return net;
155}
156
157static inline
158int net_eq(const struct net *net1, const struct net *net2)
159{
160 return 1;
161}
162#endif
163
164
165#ifdef NETNS_REFCNT_DEBUG
166static inline struct net *hold_net(struct net *net)
167{
168 if (net)
169 atomic_inc(&net->use_count);
170 return net;
171}
172
173static inline void release_net(struct net *net)
174{
175 if (net)
176 atomic_dec(&net->use_count);
177}
178#else
179static inline struct net *hold_net(struct net *net)
180{
181 return net;
182}
183
184static inline void release_net(struct net *net)
185{
186}
187#endif
188
189
190#define for_each_net(VAR) \
191 list_for_each_entry(VAR, &net_namespace_list, list)
192
193#ifdef CONFIG_NET_NS
194#define __net_init
195#define __net_exit
196#define __net_initdata
197#else
198#define __net_init __init
199#define __net_exit __exit_refok
200#define __net_initdata __initdata
201#endif
202
203struct pernet_operations {
204 struct list_head list;
205 int (*init)(struct net *net);
206 void (*exit)(struct net *net);
207};
208
209extern int register_pernet_subsys(struct pernet_operations *);
210extern void unregister_pernet_subsys(struct pernet_operations *);
211extern int register_pernet_device(struct pernet_operations *);
212extern void unregister_pernet_device(struct pernet_operations *);
213extern int register_pernet_gen_device(int *id, struct pernet_operations *);
214extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
215
216struct ctl_path;
217struct ctl_table;
218struct ctl_table_header;
219
220extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
221 const struct ctl_path *path, struct ctl_table *table);
222extern struct ctl_table_header *register_net_sysctl_rotable(
223 const struct ctl_path *path, struct ctl_table *table);
224extern void unregister_net_sysctl_table(struct ctl_table_header *header);
225
226#endif /* __NET_NET_NAMESPACE_H */