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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 | |
11 | #include <net/netns/core.h> |
12 | #include <net/netns/mib.h> |
13 | #include <net/netns/unix.h> |
14 | #include <net/netns/packet.h> |
15 | #include <net/netns/ipv4.h> |
16 | #include <net/netns/ipv6.h> |
17 | #include <net/netns/dccp.h> |
18 | #include <net/netns/x_tables.h> |
19 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
20 | #include <net/netns/conntrack.h> |
21 | #endif |
22 | #include <net/netns/xfrm.h> |
23 | |
24 | struct proc_dir_entry; |
25 | struct net_device; |
26 | struct sock; |
27 | struct ctl_table_header; |
28 | struct net_generic; |
29 | struct sock; |
30 | |
31 | |
32 | #define NETDEV_HASHBITS 8 |
33 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) |
34 | |
35 | struct net { |
36 | atomic_t count; /* To decided when the network |
37 | * namespace should be freed. |
38 | */ |
39 | #ifdef NETNS_REFCNT_DEBUG |
40 | atomic_t use_count; /* To track references we |
41 | * destroy on demand |
42 | */ |
43 | #endif |
44 | struct list_head list; /* list of network namespaces */ |
45 | struct list_head cleanup_list; /* namespaces on death row */ |
46 | struct list_head exit_list; /* Use only net_mutex */ |
47 | |
48 | struct proc_dir_entry *proc_net; |
49 | struct proc_dir_entry *proc_net_stat; |
50 | |
51 | #ifdef CONFIG_SYSCTL |
52 | struct ctl_table_set sysctls; |
53 | #endif |
54 | |
55 | struct net_device *loopback_dev; /* The loopback */ |
56 | |
57 | struct list_head dev_base_head; |
58 | struct hlist_head *dev_name_head; |
59 | struct hlist_head *dev_index_head; |
60 | |
61 | /* core fib_rules */ |
62 | struct list_head rules_ops; |
63 | spinlock_t rules_mod_lock; |
64 | |
65 | struct sock *rtnl; /* rtnetlink socket */ |
66 | struct sock *genl_sock; |
67 | |
68 | struct netns_core core; |
69 | struct netns_mib mib; |
70 | struct netns_packet packet; |
71 | struct netns_unix unx; |
72 | struct netns_ipv4 ipv4; |
73 | #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) |
74 | struct netns_ipv6 ipv6; |
75 | #endif |
76 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
77 | struct netns_dccp dccp; |
78 | #endif |
79 | #ifdef CONFIG_NETFILTER |
80 | struct netns_xt xt; |
81 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
82 | struct netns_ct ct; |
83 | #endif |
84 | struct sock *nfnl; |
85 | struct sock *nfnl_stash; |
86 | #endif |
87 | #ifdef CONFIG_XFRM |
88 | struct netns_xfrm xfrm; |
89 | #endif |
90 | #ifdef CONFIG_WEXT_CORE |
91 | struct sk_buff_head wext_nlevents; |
92 | #endif |
93 | struct net_generic *gen; |
94 | }; |
95 | |
96 | |
97 | #include <linux/seq_file_net.h> |
98 | |
99 | /* Init's network namespace */ |
100 | extern struct net init_net; |
101 | |
102 | #ifdef CONFIG_NET |
103 | extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); |
104 | |
105 | #else /* CONFIG_NET */ |
106 | static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) |
107 | { |
108 | /* There is nothing to copy so this is a noop */ |
109 | return net_ns; |
110 | } |
111 | #endif /* CONFIG_NET */ |
112 | |
113 | |
114 | extern struct list_head net_namespace_list; |
115 | |
116 | extern struct net *get_net_ns_by_pid(pid_t pid); |
117 | |
118 | #ifdef CONFIG_NET_NS |
119 | extern void __put_net(struct net *net); |
120 | |
121 | static inline struct net *get_net(struct net *net) |
122 | { |
123 | atomic_inc(&net->count); |
124 | return net; |
125 | } |
126 | |
127 | static inline struct net *maybe_get_net(struct net *net) |
128 | { |
129 | /* Used when we know struct net exists but we |
130 | * aren't guaranteed a previous reference count |
131 | * exists. If the reference count is zero this |
132 | * function fails and returns NULL. |
133 | */ |
134 | if (!atomic_inc_not_zero(&net->count)) |
135 | net = NULL; |
136 | return net; |
137 | } |
138 | |
139 | static inline void put_net(struct net *net) |
140 | { |
141 | if (atomic_dec_and_test(&net->count)) |
142 | __put_net(net); |
143 | } |
144 | |
145 | static inline |
146 | int net_eq(const struct net *net1, const struct net *net2) |
147 | { |
148 | return net1 == net2; |
149 | } |
150 | #else |
151 | |
152 | static inline struct net *get_net(struct net *net) |
153 | { |
154 | return net; |
155 | } |
156 | |
157 | static inline void put_net(struct net *net) |
158 | { |
159 | } |
160 | |
161 | static inline struct net *maybe_get_net(struct net *net) |
162 | { |
163 | return net; |
164 | } |
165 | |
166 | static inline |
167 | int net_eq(const struct net *net1, const struct net *net2) |
168 | { |
169 | return 1; |
170 | } |
171 | #endif |
172 | |
173 | |
174 | #ifdef NETNS_REFCNT_DEBUG |
175 | static inline struct net *hold_net(struct net *net) |
176 | { |
177 | if (net) |
178 | atomic_inc(&net->use_count); |
179 | return net; |
180 | } |
181 | |
182 | static inline void release_net(struct net *net) |
183 | { |
184 | if (net) |
185 | atomic_dec(&net->use_count); |
186 | } |
187 | #else |
188 | static inline struct net *hold_net(struct net *net) |
189 | { |
190 | return net; |
191 | } |
192 | |
193 | static inline void release_net(struct net *net) |
194 | { |
195 | } |
196 | #endif |
197 | |
198 | #ifdef CONFIG_NET_NS |
199 | |
200 | static inline void write_pnet(struct net **pnet, struct net *net) |
201 | { |
202 | *pnet = net; |
203 | } |
204 | |
205 | static inline struct net *read_pnet(struct net * const *pnet) |
206 | { |
207 | return *pnet; |
208 | } |
209 | |
210 | #else |
211 | |
212 | #define write_pnet(pnet, net) do { (void)(net);} while (0) |
213 | #define read_pnet(pnet) (&init_net) |
214 | |
215 | #endif |
216 | |
217 | #define for_each_net(VAR) \ |
218 | list_for_each_entry(VAR, &net_namespace_list, list) |
219 | |
220 | #define for_each_net_rcu(VAR) \ |
221 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) |
222 | |
223 | #ifdef CONFIG_NET_NS |
224 | #define __net_init |
225 | #define __net_exit |
226 | #define __net_initdata |
227 | #else |
228 | #define __net_init __init |
229 | #define __net_exit __exit_refok |
230 | #define __net_initdata __initdata |
231 | #endif |
232 | |
233 | struct pernet_operations { |
234 | struct list_head list; |
235 | int (*init)(struct net *net); |
236 | void (*exit)(struct net *net); |
237 | void (*exit_batch)(struct list_head *net_exit_list); |
238 | int *id; |
239 | size_t size; |
240 | }; |
241 | |
242 | /* |
243 | * Use these carefully. If you implement a network device and it |
244 | * needs per network namespace operations use device pernet operations, |
245 | * otherwise use pernet subsys operations. |
246 | * |
247 | * Network interfaces need to be removed from a dying netns _before_ |
248 | * subsys notifiers can be called, as most of the network code cleanup |
249 | * (which is done from subsys notifiers) runs with the assumption that |
250 | * dev_remove_pack has been called so no new packets will arrive during |
251 | * and after the cleanup functions have been called. dev_remove_pack |
252 | * is not per namespace so instead the guarantee of no more packets |
253 | * arriving in a network namespace is provided by ensuring that all |
254 | * network devices and all sockets have left the network namespace |
255 | * before the cleanup methods are called. |
256 | * |
257 | * For the longest time the ipv4 icmp code was registered as a pernet |
258 | * device which caused kernel oops, and panics during network |
259 | * namespace cleanup. So please don't get this wrong. |
260 | */ |
261 | extern int register_pernet_subsys(struct pernet_operations *); |
262 | extern void unregister_pernet_subsys(struct pernet_operations *); |
263 | extern int register_pernet_device(struct pernet_operations *); |
264 | extern void unregister_pernet_device(struct pernet_operations *); |
265 | |
266 | struct ctl_path; |
267 | struct ctl_table; |
268 | struct ctl_table_header; |
269 | |
270 | extern struct ctl_table_header *register_net_sysctl_table(struct net *net, |
271 | const struct ctl_path *path, struct ctl_table *table); |
272 | extern struct ctl_table_header *register_net_sysctl_rotable( |
273 | const struct ctl_path *path, struct ctl_table *table); |
274 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
275 | |
276 | #endif /* __NET_NET_NAMESPACE_H */ |
277 |
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