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