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1/*
2 * Operations on the network namespace
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; /* To decided when the network
39 * namespace should be freed.
40 */
41 atomic_t count; /* To decided when the network
42 * namespace should be shut down.
43 */
44#ifdef NETNS_REFCNT_DEBUG
45 atomic_t use_count; /* To track references we
46 * destroy on demand
47 */
48#endif
49 spinlock_t rules_mod_lock;
50
51 struct list_head list; /* list of network namespaces */
52 struct list_head cleanup_list; /* namespaces on death row */
53 struct list_head exit_list; /* Use only net_mutex */
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; /* rtnetlink socket */
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; /* protected by rtnl_mutex */
69
70 /* core fib_rules */
71 struct list_head rules_ops;
72
73
74 struct net_device *loopback_dev; /* The loopback */
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 defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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 /* Note : following structs are cache line aligned */
100#ifdef CONFIG_XFRM
101 struct netns_xfrm xfrm;
102#endif
103 struct netns_ipvs *ipvs;
104};
105
106
107#include <linux/seq_file_net.h>
108
109/* Init's network namespace */
110extern struct net init_net;
111
112#ifdef CONFIG_NET
113extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
114
115#else /* CONFIG_NET */
116static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
117{
118 /* There is nothing to copy so this is a noop */
119 return net_ns;
120}
121#endif /* CONFIG_NET */
122
123
124extern struct list_head net_namespace_list;
125
126extern struct net *get_net_ns_by_pid(pid_t pid);
127extern struct net *get_net_ns_by_fd(int pid);
128
129#ifdef CONFIG_NET_NS
130extern void __put_net(struct net *net);
131
132static inline struct net *get_net(struct net *net)
133{
134 atomic_inc(&net->count);
135 return net;
136}
137
138static inline struct net *maybe_get_net(struct net *net)
139{
140 /* Used when we know struct net exists but we
141 * aren't guaranteed a previous reference count
142 * exists. If the reference count is zero this
143 * function fails and returns NULL.
144 */
145 if (!atomic_inc_not_zero(&net->count))
146 net = NULL;
147 return net;
148}
149
150static inline void put_net(struct net *net)
151{
152 if (atomic_dec_and_test(&net->count))
153 __put_net(net);
154}
155
156static inline
157int net_eq(const struct net *net1, const struct net *net2)
158{
159 return net1 == net2;
160}
161
162extern void net_drop_ns(void *);
163
164#else
165
166static inline struct net *get_net(struct net *net)
167{
168 return net;
169}
170
171static inline void put_net(struct net *net)
172{
173}
174
175static inline struct net *maybe_get_net(struct net *net)
176{
177 return net;
178}
179
180static inline
181int net_eq(const struct net *net1, const struct net *net2)
182{
183 return 1;
184}
185
186#define net_drop_ns NULL
187#endif
188
189
190#ifdef NETNS_REFCNT_DEBUG
191static inline struct net *hold_net(struct net *net)
192{
193 if (net)
194 atomic_inc(&net->use_count);
195 return net;
196}
197
198static inline void release_net(struct net *net)
199{
200 if (net)
201 atomic_dec(&net->use_count);
202}
203#else
204static inline struct net *hold_net(struct net *net)
205{
206 return net;
207}
208
209static inline void release_net(struct net *net)
210{
211}
212#endif
213
214#ifdef CONFIG_NET_NS
215
216static inline void write_pnet(struct net **pnet, struct net *net)
217{
218 *pnet = net;
219}
220
221static inline struct net *read_pnet(struct net * const *pnet)
222{
223 return *pnet;
224}
225
226#else
227
228#define write_pnet(pnet, net) do { (void)(net);} while (0)
229#define read_pnet(pnet) (&init_net)
230
231#endif
232
233#define for_each_net(VAR) \
234 list_for_each_entry(VAR, &net_namespace_list, list)
235
236#define for_each_net_rcu(VAR) \
237 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
238
239#ifdef CONFIG_NET_NS
240#define __net_init
241#define __net_exit
242#define __net_initdata
243#else
244#define __net_init __init
245#define __net_exit __exit_refok
246#define __net_initdata __initdata
247#endif
248
249struct pernet_operations {
250 struct list_head list;
251 int (*init)(struct net *net);
252 void (*exit)(struct net *net);
253 void (*exit_batch)(struct list_head *net_exit_list);
254 int *id;
255 size_t size;
256};
257
258/*
259 * Use these carefully. If you implement a network device and it
260 * needs per network namespace operations use device pernet operations,
261 * otherwise use pernet subsys operations.
262 *
263 * Network interfaces need to be removed from a dying netns _before_
264 * subsys notifiers can be called, as most of the network code cleanup
265 * (which is done from subsys notifiers) runs with the assumption that
266 * dev_remove_pack has been called so no new packets will arrive during
267 * and after the cleanup functions have been called. dev_remove_pack
268 * is not per namespace so instead the guarantee of no more packets
269 * arriving in a network namespace is provided by ensuring that all
270 * network devices and all sockets have left the network namespace
271 * before the cleanup methods are called.
272 *
273 * For the longest time the ipv4 icmp code was registered as a pernet
274 * device which caused kernel oops, and panics during network
275 * namespace cleanup. So please don't get this wrong.
276 */
277extern int register_pernet_subsys(struct pernet_operations *);
278extern void unregister_pernet_subsys(struct pernet_operations *);
279extern int register_pernet_device(struct pernet_operations *);
280extern void unregister_pernet_device(struct pernet_operations *);
281
282struct ctl_path;
283struct ctl_table;
284struct ctl_table_header;
285
286extern struct ctl_table_header *register_net_sysctl_table(struct net *net,
287 const struct ctl_path *path, struct ctl_table *table);
288extern struct ctl_table_header *register_net_sysctl_rotable(
289 const struct ctl_path *path, struct ctl_table *table);
290extern void unregister_net_sysctl_table(struct ctl_table_header *header);
291
292#endif /* __NET_NET_NAMESPACE_H */
1/*
2 * Operations on the network namespace
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; /* To decided when the network
39 * namespace should be freed.
40 */
41 atomic_t count; /* To decided when the network
42 * namespace should be shut down.
43 */
44#ifdef NETNS_REFCNT_DEBUG
45 atomic_t use_count; /* To track references we
46 * destroy on demand
47 */
48#endif
49 spinlock_t rules_mod_lock;
50
51 struct list_head list; /* list of network namespaces */
52 struct list_head cleanup_list; /* namespaces on death row */
53 struct list_head exit_list; /* Use only net_mutex */
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; /* rtnetlink socket */
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; /* protected by rtnl_mutex */
69
70 /* core fib_rules */
71 struct list_head rules_ops;
72
73
74 struct net_device *loopback_dev; /* The loopback */
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 /* Note : following structs are cache line aligned */
100#ifdef CONFIG_XFRM
101 struct netns_xfrm xfrm;
102#endif
103 struct netns_ipvs *ipvs;
104};
105
106
107#include <linux/seq_file_net.h>
108
109/* Init's network namespace */
110extern struct net init_net;
111
112#ifdef CONFIG_NET
113extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns);
114
115#else /* CONFIG_NET */
116static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns)
117{
118 /* There is nothing to copy so this is a noop */
119 return net_ns;
120}
121#endif /* CONFIG_NET */
122
123
124extern struct list_head net_namespace_list;
125
126extern struct net *get_net_ns_by_pid(pid_t pid);
127extern struct net *get_net_ns_by_fd(int pid);
128
129#ifdef CONFIG_NET_NS
130extern void __put_net(struct net *net);
131
132static inline struct net *get_net(struct net *net)
133{
134 atomic_inc(&net->count);
135 return net;
136}
137
138static inline struct net *maybe_get_net(struct net *net)
139{
140 /* Used when we know struct net exists but we
141 * aren't guaranteed a previous reference count
142 * exists. If the reference count is zero this
143 * function fails and returns NULL.
144 */
145 if (!atomic_inc_not_zero(&net->count))
146 net = NULL;
147 return net;
148}
149
150static inline void put_net(struct net *net)
151{
152 if (atomic_dec_and_test(&net->count))
153 __put_net(net);
154}
155
156static inline
157int net_eq(const struct net *net1, const struct net *net2)
158{
159 return net1 == net2;
160}
161
162extern void net_drop_ns(void *);
163
164#else
165
166static inline struct net *get_net(struct net *net)
167{
168 return net;
169}
170
171static inline void put_net(struct net *net)
172{
173}
174
175static inline struct net *maybe_get_net(struct net *net)
176{
177 return net;
178}
179
180static inline
181int net_eq(const struct net *net1, const struct net *net2)
182{
183 return 1;
184}
185
186#define net_drop_ns NULL
187#endif
188
189
190#ifdef NETNS_REFCNT_DEBUG
191static inline struct net *hold_net(struct net *net)
192{
193 if (net)
194 atomic_inc(&net->use_count);
195 return net;
196}
197
198static inline void release_net(struct net *net)
199{
200 if (net)
201 atomic_dec(&net->use_count);
202}
203#else
204static inline struct net *hold_net(struct net *net)
205{
206 return net;
207}
208
209static inline void release_net(struct net *net)
210{
211}
212#endif
213
214#ifdef CONFIG_NET_NS
215
216static inline void write_pnet(struct net **pnet, struct net *net)
217{
218 *pnet = net;
219}
220
221static inline struct net *read_pnet(struct net * const *pnet)
222{
223 return *pnet;
224}
225
226#else
227
228#define write_pnet(pnet, net) do { (void)(net);} while (0)
229#define read_pnet(pnet) (&init_net)
230
231#endif
232
233#define for_each_net(VAR) \
234 list_for_each_entry(VAR, &net_namespace_list, list)
235
236#define for_each_net_rcu(VAR) \
237 list_for_each_entry_rcu(VAR, &net_namespace_list, list)
238
239#ifdef CONFIG_NET_NS
240#define __net_init
241#define __net_exit
242#define __net_initdata
243#else
244#define __net_init __init
245#define __net_exit __exit_refok
246#define __net_initdata __initdata
247#endif
248
249struct pernet_operations {
250 struct list_head list;
251 int (*init)(struct net *net);
252 void (*exit)(struct net *net);
253 void (*exit_batch)(struct list_head *net_exit_list);
254 int *id;
255 size_t size;
256};
257
258/*
259 * Use these carefully. If you implement a network device and it
260 * needs per network namespace operations use device pernet operations,
261 * otherwise use pernet subsys operations.
262 *
263 * Network interfaces need to be removed from a dying netns _before_
264 * subsys notifiers can be called, as most of the network code cleanup
265 * (which is done from subsys notifiers) runs with the assumption that
266 * dev_remove_pack has been called so no new packets will arrive during
267 * and after the cleanup functions have been called. dev_remove_pack
268 * is not per namespace so instead the guarantee of no more packets
269 * arriving in a network namespace is provided by ensuring that all
270 * network devices and all sockets have left the network namespace
271 * before the cleanup methods are called.
272 *
273 * For the longest time the ipv4 icmp code was registered as a pernet
274 * device which caused kernel oops, and panics during network
275 * namespace cleanup. So please don't get this wrong.
276 */
277extern int register_pernet_subsys(struct pernet_operations *);
278extern void unregister_pernet_subsys(struct pernet_operations *);
279extern int register_pernet_device(struct pernet_operations *);
280extern void unregister_pernet_device(struct pernet_operations *);
281
282struct ctl_table;
283struct ctl_table_header;
284
285#ifdef CONFIG_SYSCTL
286extern int net_sysctl_init(void);
287extern struct ctl_table_header *register_net_sysctl(struct net *net,
288 const char *path, struct ctl_table *table);
289extern void unregister_net_sysctl_table(struct ctl_table_header *header);
290#else
291static inline int net_sysctl_init(void) { return 0; }
292static inline struct ctl_table_header *register_net_sysctl(struct net *net,
293 const char *path, struct ctl_table *table)
294{
295 return NULL;
296}
297static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
298{
299}
300#endif
301
302
303#endif /* __NET_NET_NAMESPACE_H */