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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 | |
7c28bd0b ED |
31 | |
32 | #define NETDEV_HASHBITS 8 | |
33 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
34 | ||
5f256bec EB |
35 | struct net { |
36 | atomic_t count; /* To decided when the network | |
37 | * namespace should be freed. | |
38 | */ | |
5d1e4468 | 39 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
40 | atomic_t use_count; /* To track references we |
41 | * destroy on demand | |
42 | */ | |
5d1e4468 | 43 | #endif |
5f256bec EB |
44 | struct list_head list; /* list of network namespaces */ |
45 | struct work_struct work; /* work struct for freeing */ | |
457c4cbc EB |
46 | |
47 | struct proc_dir_entry *proc_net; | |
48 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 49 | |
73455092 AV |
50 | #ifdef CONFIG_SYSCTL |
51 | struct ctl_table_set sysctls; | |
52 | #endif | |
95bdfccb | 53 | |
2774c7ab EB |
54 | struct net_device *loopback_dev; /* The loopback */ |
55 | ||
881d966b EB |
56 | struct list_head dev_base_head; |
57 | struct hlist_head *dev_name_head; | |
58 | struct hlist_head *dev_index_head; | |
97c53cac | 59 | |
5fd30ee7 DL |
60 | /* core fib_rules */ |
61 | struct list_head rules_ops; | |
62 | spinlock_t rules_mod_lock; | |
63 | ||
97c53cac | 64 | struct sock *rtnl; /* rtnetlink socket */ |
134e6375 | 65 | struct sock *genl_sock; |
d12d01d6 | 66 | |
8efa6e93 | 67 | struct netns_core core; |
852566f5 | 68 | struct netns_mib mib; |
2aaef4e4 | 69 | struct netns_packet packet; |
a0a53c8b | 70 | struct netns_unix unx; |
8afd351c | 71 | struct netns_ipv4 ipv4; |
b0f159db DL |
72 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
73 | struct netns_ipv6 ipv6; | |
74 | #endif | |
67019cc9 PE |
75 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
76 | struct netns_dccp dccp; | |
77 | #endif | |
8d870052 AD |
78 | #ifdef CONFIG_NETFILTER |
79 | struct netns_xt xt; | |
dfdb8d79 AD |
80 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
81 | struct netns_ct ct; | |
82 | #endif | |
d62ddc21 AD |
83 | #endif |
84 | #ifdef CONFIG_XFRM | |
85 | struct netns_xfrm xfrm; | |
b333b3d2 | 86 | #endif |
3d23e349 | 87 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 88 | struct sk_buff_head wext_nlevents; |
8d870052 | 89 | #endif |
dec827d1 | 90 | struct net_generic *gen; |
5f256bec EB |
91 | }; |
92 | ||
225c0a01 | 93 | |
c0f39322 DL |
94 | #include <linux/seq_file_net.h> |
95 | ||
4fabcd71 | 96 | /* Init's network namespace */ |
5f256bec | 97 | extern struct net init_net; |
a4aa834a DL |
98 | |
99 | #ifdef CONFIG_NET | |
4fabcd71 | 100 | #define INIT_NET_NS(net_ns) .net_ns = &init_net, |
4fabcd71 | 101 | |
9dd776b6 | 102 | extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); |
225c0a01 DL |
103 | |
104 | #else /* CONFIG_NET */ | |
105 | ||
106 | #define INIT_NET_NS(net_ns) | |
107 | ||
9dd776b6 EB |
108 | static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) |
109 | { | |
110 | /* There is nothing to copy so this is a noop */ | |
111 | return net_ns; | |
112 | } | |
225c0a01 DL |
113 | #endif /* CONFIG_NET */ |
114 | ||
115 | ||
116 | extern struct list_head net_namespace_list; | |
9dd776b6 | 117 | |
30ffee84 JB |
118 | extern struct net *get_net_ns_by_pid(pid_t pid); |
119 | ||
d4655795 | 120 | #ifdef CONFIG_NET_NS |
5f256bec EB |
121 | extern void __put_net(struct net *net); |
122 | ||
123 | static inline struct net *get_net(struct net *net) | |
124 | { | |
125 | atomic_inc(&net->count); | |
126 | return net; | |
127 | } | |
128 | ||
077130c0 EB |
129 | static inline struct net *maybe_get_net(struct net *net) |
130 | { | |
131 | /* Used when we know struct net exists but we | |
132 | * aren't guaranteed a previous reference count | |
133 | * exists. If the reference count is zero this | |
134 | * function fails and returns NULL. | |
135 | */ | |
136 | if (!atomic_inc_not_zero(&net->count)) | |
137 | net = NULL; | |
138 | return net; | |
139 | } | |
140 | ||
5f256bec EB |
141 | static inline void put_net(struct net *net) |
142 | { | |
143 | if (atomic_dec_and_test(&net->count)) | |
144 | __put_net(net); | |
145 | } | |
146 | ||
878628fb YH |
147 | static inline |
148 | int net_eq(const struct net *net1, const struct net *net2) | |
149 | { | |
150 | return net1 == net2; | |
151 | } | |
d4655795 | 152 | #else |
b9f75f45 | 153 | |
d4655795 PE |
154 | static inline struct net *get_net(struct net *net) |
155 | { | |
156 | return net; | |
157 | } | |
158 | ||
159 | static inline void put_net(struct net *net) | |
160 | { | |
161 | } | |
162 | ||
5d1e4468 DL |
163 | static inline struct net *maybe_get_net(struct net *net) |
164 | { | |
165 | return net; | |
166 | } | |
167 | ||
168 | static inline | |
169 | int net_eq(const struct net *net1, const struct net *net2) | |
170 | { | |
171 | return 1; | |
172 | } | |
173 | #endif | |
174 | ||
175 | ||
176 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
177 | static inline struct net *hold_net(struct net *net) |
178 | { | |
5d1e4468 DL |
179 | if (net) |
180 | atomic_inc(&net->use_count); | |
d4655795 PE |
181 | return net; |
182 | } | |
183 | ||
184 | static inline void release_net(struct net *net) | |
185 | { | |
5d1e4468 DL |
186 | if (net) |
187 | atomic_dec(&net->use_count); | |
d4655795 | 188 | } |
5d1e4468 DL |
189 | #else |
190 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
191 | { |
192 | return net; | |
193 | } | |
878628fb | 194 | |
5d1e4468 | 195 | static inline void release_net(struct net *net) |
878628fb | 196 | { |
878628fb | 197 | } |
d4655795 | 198 | #endif |
5f256bec | 199 | |
8f424b5f ED |
200 | #ifdef CONFIG_NET_NS |
201 | ||
202 | static inline void write_pnet(struct net **pnet, struct net *net) | |
203 | { | |
204 | *pnet = net; | |
205 | } | |
206 | ||
207 | static inline struct net *read_pnet(struct net * const *pnet) | |
208 | { | |
209 | return *pnet; | |
210 | } | |
211 | ||
212 | #else | |
213 | ||
214 | #define write_pnet(pnet, net) do { (void)(net);} while (0) | |
215 | #define read_pnet(pnet) (&init_net) | |
216 | ||
217 | #endif | |
5d1e4468 | 218 | |
5f256bec EB |
219 | #define for_each_net(VAR) \ |
220 | list_for_each_entry(VAR, &net_namespace_list, list) | |
221 | ||
11a28d37 JB |
222 | #define for_each_net_rcu(VAR) \ |
223 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
224 | ||
4665079c PE |
225 | #ifdef CONFIG_NET_NS |
226 | #define __net_init | |
227 | #define __net_exit | |
022cbae6 | 228 | #define __net_initdata |
4665079c PE |
229 | #else |
230 | #define __net_init __init | |
231 | #define __net_exit __exit_refok | |
022cbae6 | 232 | #define __net_initdata __initdata |
4665079c | 233 | #endif |
5f256bec EB |
234 | |
235 | struct pernet_operations { | |
236 | struct list_head list; | |
237 | int (*init)(struct net *net); | |
238 | void (*exit)(struct net *net); | |
239 | }; | |
240 | ||
17edde52 EB |
241 | /* |
242 | * Use these carefully. If you implement a network device and it | |
243 | * needs per network namespace operations use device pernet operations, | |
244 | * otherwise use pernet subsys operations. | |
245 | * | |
4edf547b JB |
246 | * Network interfaces need to be removed from a dying netns _before_ |
247 | * subsys notifiers can be called, as most of the network code cleanup | |
248 | * (which is done from subsys notifiers) runs with the assumption that | |
249 | * dev_remove_pack has been called so no new packets will arrive during | |
250 | * and after the cleanup functions have been called. dev_remove_pack | |
251 | * is not per namespace so instead the guarantee of no more packets | |
252 | * arriving in a network namespace is provided by ensuring that all | |
253 | * network devices and all sockets have left the network namespace | |
254 | * before the cleanup methods are called. | |
17edde52 EB |
255 | * |
256 | * For the longest time the ipv4 icmp code was registered as a pernet | |
257 | * device which caused kernel oops, and panics during network | |
258 | * namespace cleanup. So please don't get this wrong. | |
259 | */ | |
5f256bec EB |
260 | extern int register_pernet_subsys(struct pernet_operations *); |
261 | extern void unregister_pernet_subsys(struct pernet_operations *); | |
485ac57b AD |
262 | extern int register_pernet_gen_subsys(int *id, struct pernet_operations *); |
263 | extern void unregister_pernet_gen_subsys(int id, struct pernet_operations *); | |
5f256bec EB |
264 | extern int register_pernet_device(struct pernet_operations *); |
265 | extern void unregister_pernet_device(struct pernet_operations *); | |
c93cf61f PE |
266 | extern int register_pernet_gen_device(int *id, struct pernet_operations *); |
267 | extern void unregister_pernet_gen_device(int id, struct pernet_operations *); | |
5f256bec | 268 | |
95bdfccb EB |
269 | struct ctl_path; |
270 | struct ctl_table; | |
271 | struct ctl_table_header; | |
d62c612e | 272 | |
95bdfccb EB |
273 | extern struct ctl_table_header *register_net_sysctl_table(struct net *net, |
274 | const struct ctl_path *path, struct ctl_table *table); | |
d62c612e PE |
275 | extern struct ctl_table_header *register_net_sysctl_rotable( |
276 | const struct ctl_path *path, struct ctl_table *table); | |
95bdfccb EB |
277 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
278 | ||
5f256bec | 279 | #endif /* __NET_NET_NAMESPACE_H */ |