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/unix.h>
13#include <net/netns/packet.h>
14#include <net/netns/ipv4.h>
15#include <net/netns/ipv6.h>
16#include <net/netns/dccp.h>
17#include <net/netns/x_tables.h>
18
19struct proc_dir_entry;
20struct net_device;
21struct sock;
22struct ctl_table_header;
23struct net_generic;
24
25struct net {
26 atomic_t count; /* To decided when the network
27 * namespace should be freed.
28 */
29#ifdef NETNS_REFCNT_DEBUG
30 atomic_t use_count; /* To track references we
31 * destroy on demand
32 */
33#endif
34 struct list_head list; /* list of network namespaces */
35 struct work_struct work; /* work struct for freeing */
36
37 struct proc_dir_entry *proc_net;
38 struct proc_dir_entry *proc_net_stat;
39
40 struct list_head sysctl_table_headers;
41
42 struct net_device *loopback_dev; /* The loopback */
43
44 struct list_head dev_base_head;
45 struct hlist_head *dev_name_head;
46 struct hlist_head *dev_index_head;
47
48 /* core fib_rules */
49 struct list_head rules_ops;
50 spinlock_t rules_mod_lock;
51
52 struct sock *rtnl; /* rtnetlink socket */
53
54 struct netns_core core;
55 struct netns_packet packet;
56 struct netns_unix unx;
57 struct netns_ipv4 ipv4;
58#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
59 struct netns_ipv6 ipv6;
60#endif
61#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
62 struct netns_dccp dccp;
63#endif
64#ifdef CONFIG_NETFILTER
65 struct netns_xt xt;
66#endif
67 struct net_generic *gen;
68};
69
70
71#include <linux/seq_file_net.h>
72
73/* Init's network namespace */
74extern struct net init_net;
75
76#ifdef CONFIG_NET
77#define INIT_NET_NS(net_ns) .net_ns = &init_net,
78
79extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
80
81#else /* CONFIG_NET */
82
83#define INIT_NET_NS(net_ns)
84
85static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
86{
87 /* There is nothing to copy so this is a noop */
88 return net_ns;
89}
90#endif /* CONFIG_NET */
91
92
93extern struct list_head net_namespace_list;
94
95#ifdef CONFIG_NET_NS
96extern void __put_net(struct net *net);
97
98static inline struct net *get_net(struct net *net)
99{
100 atomic_inc(&net->count);
101 return net;
102}
103
104static inline struct net *maybe_get_net(struct net *net)
105{
106 /* Used when we know struct net exists but we
107 * aren't guaranteed a previous reference count
108 * exists. If the reference count is zero this
109 * function fails and returns NULL.
110 */
111 if (!atomic_inc_not_zero(&net->count))
112 net = NULL;
113 return net;
114}
115
116static inline void put_net(struct net *net)
117{
118 if (atomic_dec_and_test(&net->count))
119 __put_net(net);
120}
121
122static inline
123int net_eq(const struct net *net1, const struct net *net2)
124{
125 return net1 == net2;
126}
127#else
128static inline struct net *get_net(struct net *net)
129{
130 return net;
131}
132
133static inline void put_net(struct net *net)
134{
135}
136
137static inline struct net *maybe_get_net(struct net *net)
138{
139 return net;
140}
141
142static inline
143int net_eq(const struct net *net1, const struct net *net2)
144{
145 return 1;
146}
147#endif
148
149
150#ifdef NETNS_REFCNT_DEBUG
151static inline struct net *hold_net(struct net *net)
152{
153 if (net)
154 atomic_inc(&net->use_count);
155 return net;
156}
157
158static inline void release_net(struct net *net)
159{
160 if (net)
161 atomic_dec(&net->use_count);
162}
163#else
164static inline struct net *hold_net(struct net *net)
165{
166 return net;
167}
168
169static inline void release_net(struct net *net)
170{
171}
172#endif
173
174
175#define for_each_net(VAR) \
176 list_for_each_entry(VAR, &net_namespace_list, list)
177
178#ifdef CONFIG_NET_NS
179#define __net_init
180#define __net_exit
181#define __net_initdata
182#else
183#define __net_init __init
184#define __net_exit __exit_refok
185#define __net_initdata __initdata
186#endif
187
188struct pernet_operations {
189 struct list_head list;
190 int (*init)(struct net *net);
191 void (*exit)(struct net *net);
192};
193
194extern int register_pernet_subsys(struct pernet_operations *);
195extern void unregister_pernet_subsys(struct pernet_operations *);
196extern int register_pernet_device(struct pernet_operations *);
197extern void unregister_pernet_device(struct pernet_operations *);
198extern int register_pernet_gen_device(int *id, struct pernet_operations *);
199extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
200
201struct ctl_path;
202struct ctl_table;
203struct ctl_table_header;
204extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
205 const struct ctl_path *path, struct ctl_table *table);
206extern void unregister_net_sysctl_table(struct ctl_table_header *header);
207
208#endif /* __NET_NET_NAMESPACE_H */