1
2
3
4#ifndef __NET_NET_NAMESPACE_H
5#define __NET_NET_NAMESPACE_H
6
7#include <linux/atomic.h>
8#include <linux/workqueue.h>
9#include <linux/list.h>
10#include <linux/sysctl.h>
11
12#include <net/netns/core.h>
13#include <net/netns/mib.h>
14#include <net/netns/unix.h>
15#include <net/netns/packet.h>
16#include <net/netns/ipv4.h>
17#include <net/netns/ipv6.h>
18#include <net/netns/dccp.h>
19#include <net/netns/x_tables.h>
20#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
21#include <net/netns/conntrack.h>
22#endif
23#include <net/netns/xfrm.h>
24
25struct proc_dir_entry;
26struct net_device;
27struct sock;
28struct ctl_table_header;
29struct net_generic;
30struct sock;
31struct netns_ipvs;
32
33
34#define NETDEV_HASHBITS 8
35#define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
36
37struct net {
38 atomic_t passive;
39
40
41 atomic_t count;
42
43
44#ifdef NETNS_REFCNT_DEBUG
45 atomic_t use_count;
46
47
48#endif
49 spinlock_t rules_mod_lock;
50
51 struct list_head list;
52 struct list_head cleanup_list;
53 struct list_head exit_list;
54
55 struct proc_dir_entry *proc_net;
56 struct proc_dir_entry *proc_net_stat;
57
58#ifdef CONFIG_SYSCTL
59 struct ctl_table_set sysctls;
60#endif
61
62 struct sock *rtnl;
63 struct sock *genl_sock;
64
65 struct list_head dev_base_head;
66 struct hlist_head *dev_name_head;
67 struct hlist_head *dev_index_head;
68 unsigned int dev_base_seq;
69
70
71 struct list_head rules_ops;
72
73
74 struct net_device *loopback_dev;
75 struct netns_core core;
76 struct netns_mib mib;
77 struct netns_packet packet;
78 struct netns_unix unx;
79 struct netns_ipv4 ipv4;
80#if IS_ENABLED(CONFIG_IPV6)
81 struct netns_ipv6 ipv6;
82#endif
83#if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
84 struct netns_dccp dccp;
85#endif
86#ifdef CONFIG_NETFILTER
87 struct netns_xt xt;
88#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
89 struct netns_ct ct;
90#endif
91 struct sock *nfnl;
92 struct sock *nfnl_stash;
93#endif
94#ifdef CONFIG_WEXT_CORE
95 struct sk_buff_head wext_nlevents;
96#endif
97 struct net_generic __rcu *gen;
98
99
100#ifdef CONFIG_XFRM
101 struct netns_xfrm xfrm;
102#endif
103 struct netns_ipvs *ipvs;
104 struct sock *diag_nlsk;
105 atomic_t rt_genid;
106};
107
108
109#include <linux/seq_file_net.h>
110
111
112extern struct net init_net;
113
114#ifdef CONFIG_NET
115extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
116
117#else
118static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
119{
120
121 return net_ns;
122}
123#endif
124
125
126extern struct list_head net_namespace_list;
127
128extern struct net *get_net_ns_by_pid(pid_t pid);
129extern struct net *get_net_ns_by_fd(int pid);
130
131#ifdef CONFIG_NET_NS
132extern void __put_net(struct net *net);
133
134static inline struct net *get_net(struct net *net)
135{
136 atomic_inc(&net->count);
137 return net;
138}
139
140static inline struct net *maybe_get_net(struct net *net)
141{
142
143
144
145
146
147 if (!atomic_inc_not_zero(&net->count))
148 net = NULL;
149 return net;
150}
151
152static inline void put_net(struct net *net)
153{
154 if (atomic_dec_and_test(&net->count))
155 __put_net(net);
156}
157
158static inline
159int net_eq(const struct net *net1, const struct net *net2)
160{
161 return net1 == net2;
162}
163
164extern void net_drop_ns(void *);
165
166#else
167
168static inline struct net *get_net(struct net *net)
169{
170 return net;
171}
172
173static inline void put_net(struct net *net)
174{
175}
176
177static inline struct net *maybe_get_net(struct net *net)
178{
179 return net;
180}
181
182static inline
183int net_eq(const struct net *net1, const struct net *net2)
184{
185 return 1;
186}
187
188#define net_drop_ns NULL
189#endif
190
191
192#ifdef NETNS_REFCNT_DEBUG
193static inline struct net *hold_net(struct net *net)
194{
195 if (net)
196 atomic_inc(&net->use_count);
197 return net;
198}
199
200static inline void release_net(struct net *net)
201{
202 if (net)
203 atomic_dec(&net->use_count);
204}
205#else
206static inline struct net *hold_net(struct net *net)
207{
208 return net;
209}
210
211static inline void release_net(struct net *net)
212{
213}
214#endif
215
216#ifdef CONFIG_NET_NS
217
218static inline void write_pnet(struct net **pnet, struct net *net)
219{
220 *pnet = net;
221}
222
223static inline struct net *read_pnet(struct net * const *pnet)
224{
225 return *pnet;
226}
227
228#else
229
230#define write_pnet(pnet, net) do { (void)(net);} while (0)
231#define read_pnet(pnet) (&init_net)
232
233#endif
234
235#define for_each_net(VAR) \
236 list_for_each_entry(VAR, &net_namespace_list, list)
237
238#define for_each_net_rcu(VAR) \
239 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
240
241#ifdef CONFIG_NET_NS
242#define __net_init
243#define __net_exit
244#define __net_initdata
245#else
246#define __net_init __init
247#define __net_exit __exit_refok
248#define __net_initdata __initdata
249#endif
250
251struct pernet_operations {
252 struct list_head list;
253 int (*init)(struct net *net);
254 void (*exit)(struct net *net);
255 void (*exit_batch)(struct list_head *net_exit_list);
256 int *id;
257 size_t size;
258};
259
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277
278
279extern int register_pernet_subsys(struct pernet_operations *);
280extern void unregister_pernet_subsys(struct pernet_operations *);
281extern int register_pernet_device(struct pernet_operations *);
282extern void unregister_pernet_device(struct pernet_operations *);
283
284struct ctl_table;
285struct ctl_table_header;
286
287#ifdef CONFIG_SYSCTL
288extern int net_sysctl_init(void);
289extern struct ctl_table_header *register_net_sysctl(struct net *net,
290 const char *path, struct ctl_table *table);
291extern void unregister_net_sysctl_table(struct ctl_table_header *header);
292#else
293static inline int net_sysctl_init(void) { return 0; }
294static inline struct ctl_table_header *register_net_sysctl(struct net *net,
295 const char *path, struct ctl_table *table)
296{
297 return NULL;
298}
299static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
300{
301}
302#endif
303
304static inline int rt_genid(struct net *net)
305{
306 return atomic_read(&net->rt_genid);
307}
308
309static inline void rt_genid_bump(struct net *net)
310{
311 atomic_inc(&net->rt_genid);
312}
313
314#endif
315