Commit | Line | Data |
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5f256bec EB |
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 | ||
8efa6e93 | 11 | #include <net/netns/core.h> |
852566f5 | 12 | #include <net/netns/mib.h> |
a0a53c8b | 13 | #include <net/netns/unix.h> |
2aaef4e4 | 14 | #include <net/netns/packet.h> |
8afd351c | 15 | #include <net/netns/ipv4.h> |
b0f159db | 16 | #include <net/netns/ipv6.h> |
67019cc9 | 17 | #include <net/netns/dccp.h> |
8d870052 | 18 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
19 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
20 | #include <net/netns/conntrack.h> | |
21 | #endif | |
d62ddc21 | 22 | #include <net/netns/xfrm.h> |
a0a53c8b | 23 | |
457c4cbc | 24 | struct proc_dir_entry; |
2774c7ab | 25 | struct net_device; |
97c53cac | 26 | struct sock; |
1597fbc0 | 27 | struct ctl_table_header; |
dec827d1 | 28 | struct net_generic; |
134e6375 | 29 | struct sock; |
1597fbc0 | 30 | |
5f256bec EB |
31 | struct net { |
32 | atomic_t count; /* To decided when the network | |
33 | * namespace should be freed. | |
34 | */ | |
5d1e4468 | 35 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
36 | atomic_t use_count; /* To track references we |
37 | * destroy on demand | |
38 | */ | |
5d1e4468 | 39 | #endif |
5f256bec EB |
40 | struct list_head list; /* list of network namespaces */ |
41 | struct work_struct work; /* work struct for freeing */ | |
457c4cbc EB |
42 | |
43 | struct proc_dir_entry *proc_net; | |
44 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 45 | |
73455092 AV |
46 | #ifdef CONFIG_SYSCTL |
47 | struct ctl_table_set sysctls; | |
48 | #endif | |
95bdfccb | 49 | |
2774c7ab EB |
50 | struct net_device *loopback_dev; /* The loopback */ |
51 | ||
881d966b EB |
52 | struct list_head dev_base_head; |
53 | struct hlist_head *dev_name_head; | |
54 | struct hlist_head *dev_index_head; | |
97c53cac | 55 | |
5fd30ee7 DL |
56 | /* core fib_rules */ |
57 | struct list_head rules_ops; | |
58 | spinlock_t rules_mod_lock; | |
59 | ||
97c53cac | 60 | struct sock *rtnl; /* rtnetlink socket */ |
134e6375 | 61 | struct sock *genl_sock; |
d12d01d6 | 62 | |
8efa6e93 | 63 | struct netns_core core; |
852566f5 | 64 | struct netns_mib mib; |
2aaef4e4 | 65 | struct netns_packet packet; |
a0a53c8b | 66 | struct netns_unix unx; |
8afd351c | 67 | struct netns_ipv4 ipv4; |
b0f159db DL |
68 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
69 | struct netns_ipv6 ipv6; | |
70 | #endif | |
67019cc9 PE |
71 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
72 | struct netns_dccp dccp; | |
73 | #endif | |
8d870052 AD |
74 | #ifdef CONFIG_NETFILTER |
75 | struct netns_xt xt; | |
dfdb8d79 AD |
76 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
77 | struct netns_ct ct; | |
78 | #endif | |
d62ddc21 AD |
79 | #endif |
80 | #ifdef CONFIG_XFRM | |
81 | struct netns_xfrm xfrm; | |
8d870052 | 82 | #endif |
dec827d1 | 83 | struct net_generic *gen; |
5f256bec EB |
84 | }; |
85 | ||
225c0a01 | 86 | |
c0f39322 DL |
87 | #include <linux/seq_file_net.h> |
88 | ||
4fabcd71 | 89 | /* Init's network namespace */ |
5f256bec | 90 | extern struct net init_net; |
a4aa834a DL |
91 | |
92 | #ifdef CONFIG_NET | |
4fabcd71 | 93 | #define INIT_NET_NS(net_ns) .net_ns = &init_net, |
4fabcd71 | 94 | |
9dd776b6 | 95 | extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); |
225c0a01 DL |
96 | |
97 | #else /* CONFIG_NET */ | |
98 | ||
99 | #define INIT_NET_NS(net_ns) | |
100 | ||
9dd776b6 EB |
101 | static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) |
102 | { | |
103 | /* There is nothing to copy so this is a noop */ | |
104 | return net_ns; | |
105 | } | |
225c0a01 DL |
106 | #endif /* CONFIG_NET */ |
107 | ||
108 | ||
109 | extern struct list_head net_namespace_list; | |
9dd776b6 | 110 | |
d4655795 | 111 | #ifdef CONFIG_NET_NS |
5f256bec EB |
112 | extern void __put_net(struct net *net); |
113 | ||
114 | static inline struct net *get_net(struct net *net) | |
115 | { | |
116 | atomic_inc(&net->count); | |
117 | return net; | |
118 | } | |
119 | ||
077130c0 EB |
120 | static inline struct net *maybe_get_net(struct net *net) |
121 | { | |
122 | /* Used when we know struct net exists but we | |
123 | * aren't guaranteed a previous reference count | |
124 | * exists. If the reference count is zero this | |
125 | * function fails and returns NULL. | |
126 | */ | |
127 | if (!atomic_inc_not_zero(&net->count)) | |
128 | net = NULL; | |
129 | return net; | |
130 | } | |
131 | ||
5f256bec EB |
132 | static inline void put_net(struct net *net) |
133 | { | |
134 | if (atomic_dec_and_test(&net->count)) | |
135 | __put_net(net); | |
136 | } | |
137 | ||
878628fb YH |
138 | static inline |
139 | int net_eq(const struct net *net1, const struct net *net2) | |
140 | { | |
141 | return net1 == net2; | |
142 | } | |
d4655795 | 143 | #else |
b9f75f45 | 144 | |
d4655795 PE |
145 | static inline struct net *get_net(struct net *net) |
146 | { | |
147 | return net; | |
148 | } | |
149 | ||
150 | static inline void put_net(struct net *net) | |
151 | { | |
152 | } | |
153 | ||
5d1e4468 DL |
154 | static inline struct net *maybe_get_net(struct net *net) |
155 | { | |
156 | return net; | |
157 | } | |
158 | ||
159 | static inline | |
160 | int net_eq(const struct net *net1, const struct net *net2) | |
161 | { | |
162 | return 1; | |
163 | } | |
164 | #endif | |
165 | ||
166 | ||
167 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
168 | static inline struct net *hold_net(struct net *net) |
169 | { | |
5d1e4468 DL |
170 | if (net) |
171 | atomic_inc(&net->use_count); | |
d4655795 PE |
172 | return net; |
173 | } | |
174 | ||
175 | static inline void release_net(struct net *net) | |
176 | { | |
5d1e4468 DL |
177 | if (net) |
178 | atomic_dec(&net->use_count); | |
d4655795 | 179 | } |
5d1e4468 DL |
180 | #else |
181 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
182 | { |
183 | return net; | |
184 | } | |
878628fb | 185 | |
5d1e4468 | 186 | static inline void release_net(struct net *net) |
878628fb | 187 | { |
878628fb | 188 | } |
d4655795 | 189 | #endif |
5f256bec | 190 | |
8f424b5f ED |
191 | #ifdef CONFIG_NET_NS |
192 | ||
193 | static inline void write_pnet(struct net **pnet, struct net *net) | |
194 | { | |
195 | *pnet = net; | |
196 | } | |
197 | ||
198 | static inline struct net *read_pnet(struct net * const *pnet) | |
199 | { | |
200 | return *pnet; | |
201 | } | |
202 | ||
203 | #else | |
204 | ||
205 | #define write_pnet(pnet, net) do { (void)(net);} while (0) | |
206 | #define read_pnet(pnet) (&init_net) | |
207 | ||
208 | #endif | |
5d1e4468 | 209 | |
5f256bec EB |
210 | #define for_each_net(VAR) \ |
211 | list_for_each_entry(VAR, &net_namespace_list, list) | |
212 | ||
11a28d37 JB |
213 | #define for_each_net_rcu(VAR) \ |
214 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
215 | ||
4665079c PE |
216 | #ifdef CONFIG_NET_NS |
217 | #define __net_init | |
218 | #define __net_exit | |
022cbae6 | 219 | #define __net_initdata |
4665079c PE |
220 | #else |
221 | #define __net_init __init | |
222 | #define __net_exit __exit_refok | |
022cbae6 | 223 | #define __net_initdata __initdata |
4665079c | 224 | #endif |
5f256bec EB |
225 | |
226 | struct pernet_operations { | |
227 | struct list_head list; | |
228 | int (*init)(struct net *net); | |
229 | void (*exit)(struct net *net); | |
230 | }; | |
231 | ||
17edde52 EB |
232 | /* |
233 | * Use these carefully. If you implement a network device and it | |
234 | * needs per network namespace operations use device pernet operations, | |
235 | * otherwise use pernet subsys operations. | |
236 | * | |
237 | * This is critically important. Most of the network code cleanup | |
238 | * runs with the assumption that dev_remove_pack has been called so no | |
239 | * new packets will arrive during and after the cleanup functions have | |
240 | * been called. dev_remove_pack is not per namespace so instead the | |
241 | * guarantee of no more packets arriving in a network namespace is | |
242 | * provided by ensuring that all network devices and all sockets have | |
243 | * left the network namespace before the cleanup methods are called. | |
244 | * | |
245 | * For the longest time the ipv4 icmp code was registered as a pernet | |
246 | * device which caused kernel oops, and panics during network | |
247 | * namespace cleanup. So please don't get this wrong. | |
248 | */ | |
5f256bec EB |
249 | extern int register_pernet_subsys(struct pernet_operations *); |
250 | extern void unregister_pernet_subsys(struct pernet_operations *); | |
485ac57b AD |
251 | extern int register_pernet_gen_subsys(int *id, struct pernet_operations *); |
252 | extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *); | |
5f256bec EB |
253 | extern int register_pernet_device(struct pernet_operations *); |
254 | extern void unregister_pernet_device(struct pernet_operations *); | |
c93cf61f PE |
255 | extern int register_pernet_gen_device(int *id, struct pernet_operations *); |
256 | extern void unregister_pernet_gen_device(int id, struct pernet_operations *); | |
5f256bec | 257 | |
95bdfccb EB |
258 | struct ctl_path; |
259 | struct ctl_table; | |
260 | struct ctl_table_header; | |
d62c612e | 261 | |
95bdfccb EB |
262 | extern struct ctl_table_header *register_net_sysctl_table(struct net *net, |
263 | const struct ctl_path *path, struct ctl_table *table); | |
d62c612e PE |
264 | extern struct ctl_table_header *register_net_sysctl_rotable( |
265 | const struct ctl_path *path, struct ctl_table *table); | |
95bdfccb EB |
266 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
267 | ||
5f256bec | 268 | #endif /* __NET_NET_NAMESPACE_H */ |