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/unix.h>
12#include <net/netns/packet.h>
13#include <net/netns/ipv4.h>
14#include <net/netns/ipv6.h>
15#include <net/netns/x_tables.h>
16
17struct proc_dir_entry;
18struct net_device;
19struct sock;
20struct ctl_table_header;
21
22struct net {
23 atomic_t count; /* To decided when the network
24 * namespace should be freed.
25 */
26 atomic_t use_count; /* To track references we
27 * destroy on demand
28 */
29 struct list_head list; /* list of network namespaces */
30 struct work_struct work; /* work struct for freeing */
31
32 struct proc_dir_entry *proc_net;
33 struct proc_dir_entry *proc_net_stat;
34 struct proc_dir_entry *proc_net_root;
35
36 struct list_head sysctl_table_headers;
37
38 struct net_device *loopback_dev; /* The loopback */
39
40 struct list_head dev_base_head;
41 struct hlist_head *dev_name_head;
42 struct hlist_head *dev_index_head;
43
44 /* core fib_rules */
45 struct list_head rules_ops;
46 spinlock_t rules_mod_lock;
47
48 struct sock *rtnl; /* rtnetlink socket */
49
50 /* core sysctls */
51 struct ctl_table_header *sysctl_core_hdr;
52 int sysctl_somaxconn;
53
54 struct netns_packet packet;
55 struct netns_unix unx;
56 struct netns_ipv4 ipv4;
57#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
58 struct netns_ipv6 ipv6;
59#endif
60#ifdef CONFIG_NETFILTER
61 struct netns_xt xt;
62#endif
63};
64
65#ifdef CONFIG_NET
66/* Init's network namespace */
67extern struct net init_net;
68#define INIT_NET_NS(net_ns) .net_ns = &init_net,
69#else
70#define INIT_NET_NS(net_ns)
71#endif
72
73extern struct list_head net_namespace_list;
74
75#ifdef CONFIG_NET
76extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
77#else
78static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
79{
80 /* There is nothing to copy so this is a noop */
81 return net_ns;
82}
83#endif
84
85#ifdef CONFIG_NET_NS
86extern void __put_net(struct net *net);
87
88static inline struct net *get_net(struct net *net)
89{
90 atomic_inc(&net->count);
91 return net;
92}
93
94static inline struct net *maybe_get_net(struct net *net)
95{
96 /* Used when we know struct net exists but we
97 * aren't guaranteed a previous reference count
98 * exists. If the reference count is zero this
99 * function fails and returns NULL.
100 */
101 if (!atomic_inc_not_zero(&net->count))
102 net = NULL;
103 return net;
104}
105
106static inline void put_net(struct net *net)
107{
108 if (atomic_dec_and_test(&net->count))
109 __put_net(net);
110}
111
112static inline struct net *hold_net(struct net *net)
113{
114 atomic_inc(&net->use_count);
115 return net;
116}
117
118static inline void release_net(struct net *net)
119{
120 atomic_dec(&net->use_count);
121}
122#else
123static inline struct net *get_net(struct net *net)
124{
125 return net;
126}
127
128static inline void put_net(struct net *net)
129{
130}
131
132static inline struct net *hold_net(struct net *net)
133{
134 return net;
135}
136
137static inline void release_net(struct net *net)
138{
139}
140
141static inline struct net *maybe_get_net(struct net *net)
142{
143 return net;
144}
145#endif
146
147#define for_each_net(VAR) \
148 list_for_each_entry(VAR, &net_namespace_list, list)
149
150#ifdef CONFIG_NET_NS
151#define __net_init
152#define __net_exit
153#define __net_initdata
154#else
155#define __net_init __init
156#define __net_exit __exit_refok
157#define __net_initdata __initdata
158#endif
159
160struct pernet_operations {
161 struct list_head list;
162 int (*init)(struct net *net);
163 void (*exit)(struct net *net);
164};
165
166extern int register_pernet_subsys(struct pernet_operations *);
167extern void unregister_pernet_subsys(struct pernet_operations *);
168extern int register_pernet_device(struct pernet_operations *);
169extern void unregister_pernet_device(struct pernet_operations *);
170
171struct ctl_path;
172struct ctl_table;
173struct ctl_table_header;
174extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
175 const struct ctl_path *path, struct ctl_table *table);
176extern void unregister_net_sysctl_table(struct ctl_table_header *header);
177
178#endif /* __NET_NET_NAMESPACE_H */