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 int net_alive(struct net *net)
99{
100 return net && atomic_read(&net->count);
101}
102
103static inline struct net *get_net(struct net *net)
104{
105 atomic_inc(&net->count);
106 return net;
107}
108
109static inline struct net *maybe_get_net(struct net *net)
110{
111 /* Used when we know struct net exists but we
112 * aren't guaranteed a previous reference count
113 * exists. If the reference count is zero this
114 * function fails and returns NULL.
115 */
116 if (!atomic_inc_not_zero(&net->count))
117 net = NULL;
118 return net;
119}
120
121static inline void put_net(struct net *net)
122{
123 if (atomic_dec_and_test(&net->count))
124 __put_net(net);
125}
126
127static inline
128int net_eq(const struct net *net1, const struct net *net2)
129{
130 return net1 == net2;
131}
132#else
133
134static inline int net_alive(struct net *net)
135{
136 return 1;
137}
138
139static inline struct net *get_net(struct net *net)
140{
141 return net;
142}
143
144static inline void put_net(struct net *net)
145{
146}
147
148static inline struct net *maybe_get_net(struct net *net)
149{
150 return net;
151}
152
153static inline
154int net_eq(const struct net *net1, const struct net *net2)
155{
156 return 1;
157}
158#endif
159
160
161#ifdef NETNS_REFCNT_DEBUG
162static inline struct net *hold_net(struct net *net)
163{
164 if (net)
165 atomic_inc(&net->use_count);
166 return net;
167}
168
169static inline void release_net(struct net *net)
170{
171 if (net)
172 atomic_dec(&net->use_count);
173}
174#else
175static inline struct net *hold_net(struct net *net)
176{
177 return net;
178}
179
180static inline void release_net(struct net *net)
181{
182}
183#endif
184
185
186#define for_each_net(VAR) \
187 list_for_each_entry(VAR, &net_namespace_list, list)
188
189#ifdef CONFIG_NET_NS
190#define __net_init
191#define __net_exit
192#define __net_initdata
193#else
194#define __net_init __init
195#define __net_exit __exit_refok
196#define __net_initdata __initdata
197#endif
198
199struct pernet_operations {
200 struct list_head list;
201 int (*init)(struct net *net);
202 void (*exit)(struct net *net);
203};
204
205extern int register_pernet_subsys(struct pernet_operations *);
206extern void unregister_pernet_subsys(struct pernet_operations *);
207extern int register_pernet_device(struct pernet_operations *);
208extern void unregister_pernet_device(struct pernet_operations *);
209extern int register_pernet_gen_device(int *id, struct pernet_operations *);
210extern void unregister_pernet_gen_device(int id, struct pernet_operations *);
211
212struct ctl_path;
213struct ctl_table;
214struct ctl_table_header;
215extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
216 const struct ctl_path *path, struct ctl_table *table);
217extern void unregister_net_sysctl_table(struct ctl_table_header *header);
218
219#endif /* __NET_NET_NAMESPACE_H */