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