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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 <asm/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 | |
25 | struct proc_dir_entry; |
26 | struct net_device; |
27 | struct sock; |
28 | struct ctl_table_header; |
29 | struct net_generic; |
30 | struct sock; |
31 | struct netns_ipvs; |
32 | |
33 | |
34 | #define NETDEV_HASHBITS 8 |
35 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) |
36 | |
37 | struct 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 | |
69 | /* core fib_rules */ |
70 | struct list_head rules_ops; |
71 | |
72 | |
73 | struct net_device *loopback_dev; /* The loopback */ |
74 | struct netns_core core; |
75 | struct netns_mib mib; |
76 | struct netns_packet packet; |
77 | struct netns_unix unx; |
78 | struct netns_ipv4 ipv4; |
79 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
80 | struct netns_ipv6 ipv6; |
81 | #endif |
82 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
83 | struct netns_dccp dccp; |
84 | #endif |
85 | #ifdef CONFIG_NETFILTER |
86 | struct netns_xt xt; |
87 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
88 | struct netns_ct ct; |
89 | #endif |
90 | struct sock *nfnl; |
91 | struct sock *nfnl_stash; |
92 | #endif |
93 | #ifdef CONFIG_WEXT_CORE |
94 | struct sk_buff_head wext_nlevents; |
95 | #endif |
96 | struct net_generic __rcu *gen; |
97 | |
98 | /* Note : following structs are cache line aligned */ |
99 | #ifdef CONFIG_XFRM |
100 | struct netns_xfrm xfrm; |
101 | #endif |
102 | struct netns_ipvs *ipvs; |
103 | }; |
104 | |
105 | |
106 | #include <linux/seq_file_net.h> |
107 | |
108 | /* Init's network namespace */ |
109 | extern struct net init_net; |
110 | |
111 | #ifdef CONFIG_NET |
112 | extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); |
113 | |
114 | #else /* CONFIG_NET */ |
115 | static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) |
116 | { |
117 | /* There is nothing to copy so this is a noop */ |
118 | return net_ns; |
119 | } |
120 | #endif /* CONFIG_NET */ |
121 | |
122 | |
123 | extern struct list_head net_namespace_list; |
124 | |
125 | extern struct net *get_net_ns_by_pid(pid_t pid); |
126 | extern struct net *get_net_ns_by_fd(int pid); |
127 | |
128 | #ifdef CONFIG_NET_NS |
129 | extern void __put_net(struct net *net); |
130 | |
131 | static inline struct net *get_net(struct net *net) |
132 | { |
133 | atomic_inc(&net->count); |
134 | return net; |
135 | } |
136 | |
137 | static inline struct net *maybe_get_net(struct net *net) |
138 | { |
139 | /* Used when we know struct net exists but we |
140 | * aren't guaranteed a previous reference count |
141 | * exists. If the reference count is zero this |
142 | * function fails and returns NULL. |
143 | */ |
144 | if (!atomic_inc_not_zero(&net->count)) |
145 | net = NULL; |
146 | return net; |
147 | } |
148 | |
149 | static inline void put_net(struct net *net) |
150 | { |
151 | if (atomic_dec_and_test(&net->count)) |
152 | __put_net(net); |
153 | } |
154 | |
155 | static inline |
156 | int net_eq(const struct net *net1, const struct net *net2) |
157 | { |
158 | return net1 == net2; |
159 | } |
160 | |
161 | extern void net_drop_ns(void *); |
162 | |
163 | #else |
164 | |
165 | static inline struct net *get_net(struct net *net) |
166 | { |
167 | return net; |
168 | } |
169 | |
170 | static inline void put_net(struct net *net) |
171 | { |
172 | } |
173 | |
174 | static inline struct net *maybe_get_net(struct net *net) |
175 | { |
176 | return net; |
177 | } |
178 | |
179 | static inline |
180 | int net_eq(const struct net *net1, const struct net *net2) |
181 | { |
182 | return 1; |
183 | } |
184 | |
185 | #define net_drop_ns NULL |
186 | #endif |
187 | |
188 | |
189 | #ifdef NETNS_REFCNT_DEBUG |
190 | static inline struct net *hold_net(struct net *net) |
191 | { |
192 | if (net) |
193 | atomic_inc(&net->use_count); |
194 | return net; |
195 | } |
196 | |
197 | static inline void release_net(struct net *net) |
198 | { |
199 | if (net) |
200 | atomic_dec(&net->use_count); |
201 | } |
202 | #else |
203 | static inline struct net *hold_net(struct net *net) |
204 | { |
205 | return net; |
206 | } |
207 | |
208 | static inline void release_net(struct net *net) |
209 | { |
210 | } |
211 | #endif |
212 | |
213 | #ifdef CONFIG_NET_NS |
214 | |
215 | static inline void write_pnet(struct net **pnet, struct net *net) |
216 | { |
217 | *pnet = net; |
218 | } |
219 | |
220 | static inline struct net *read_pnet(struct net * const *pnet) |
221 | { |
222 | return *pnet; |
223 | } |
224 | |
225 | #else |
226 | |
227 | #define write_pnet(pnet, net) do { (void)(net);} while (0) |
228 | #define read_pnet(pnet) (&init_net) |
229 | |
230 | #endif |
231 | |
232 | #define for_each_net(VAR) \ |
233 | list_for_each_entry(VAR, &net_namespace_list, list) |
234 | |
235 | #define for_each_net_rcu(VAR) \ |
236 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) |
237 | |
238 | #ifdef CONFIG_NET_NS |
239 | #define __net_init |
240 | #define __net_exit |
241 | #define __net_initdata |
242 | #else |
243 | #define __net_init __init |
244 | #define __net_exit __exit_refok |
245 | #define __net_initdata __initdata |
246 | #endif |
247 | |
248 | struct pernet_operations { |
249 | struct list_head list; |
250 | int (*init)(struct net *net); |
251 | void (*exit)(struct net *net); |
252 | void (*exit_batch)(struct list_head *net_exit_list); |
253 | int *id; |
254 | size_t size; |
255 | }; |
256 | |
257 | /* |
258 | * Use these carefully. If you implement a network device and it |
259 | * needs per network namespace operations use device pernet operations, |
260 | * otherwise use pernet subsys operations. |
261 | * |
262 | * Network interfaces need to be removed from a dying netns _before_ |
263 | * subsys notifiers can be called, as most of the network code cleanup |
264 | * (which is done from subsys notifiers) runs with the assumption that |
265 | * dev_remove_pack has been called so no new packets will arrive during |
266 | * and after the cleanup functions have been called. dev_remove_pack |
267 | * is not per namespace so instead the guarantee of no more packets |
268 | * arriving in a network namespace is provided by ensuring that all |
269 | * network devices and all sockets have left the network namespace |
270 | * before the cleanup methods are called. |
271 | * |
272 | * For the longest time the ipv4 icmp code was registered as a pernet |
273 | * device which caused kernel oops, and panics during network |
274 | * namespace cleanup. So please don't get this wrong. |
275 | */ |
276 | extern int register_pernet_subsys(struct pernet_operations *); |
277 | extern void unregister_pernet_subsys(struct pernet_operations *); |
278 | extern int register_pernet_device(struct pernet_operations *); |
279 | extern void unregister_pernet_device(struct pernet_operations *); |
280 | |
281 | struct ctl_path; |
282 | struct ctl_table; |
283 | struct ctl_table_header; |
284 | |
285 | extern struct ctl_table_header *register_net_sysctl_table(struct net *net, |
286 | const struct ctl_path *path, struct ctl_table *table); |
287 | extern struct ctl_table_header *register_net_sysctl_rotable( |
288 | const struct ctl_path *path, struct ctl_table *table); |
289 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
290 | |
291 | #endif /* __NET_NET_NAMESPACE_H */ |
292 |
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