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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 <linux/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/sctp.h> |
19 | #include <net/netns/dccp.h> |
20 | #include <net/netns/netfilter.h> |
21 | #include <net/netns/x_tables.h> |
22 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
23 | #include <net/netns/conntrack.h> |
24 | #endif |
25 | #include <net/netns/xfrm.h> |
26 | |
27 | struct user_namespace; |
28 | struct proc_dir_entry; |
29 | struct net_device; |
30 | struct sock; |
31 | struct ctl_table_header; |
32 | struct net_generic; |
33 | struct sock; |
34 | struct netns_ipvs; |
35 | |
36 | |
37 | #define NETDEV_HASHBITS 8 |
38 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) |
39 | |
40 | struct net { |
41 | atomic_t passive; /* To decided when the network |
42 | * namespace should be freed. |
43 | */ |
44 | atomic_t count; /* To decided when the network |
45 | * namespace should be shut down. |
46 | */ |
47 | #ifdef NETNS_REFCNT_DEBUG |
48 | atomic_t use_count; /* To track references we |
49 | * destroy on demand |
50 | */ |
51 | #endif |
52 | spinlock_t rules_mod_lock; |
53 | |
54 | struct list_head list; /* list of network namespaces */ |
55 | struct list_head cleanup_list; /* namespaces on death row */ |
56 | struct list_head exit_list; /* Use only net_mutex */ |
57 | |
58 | struct user_namespace *user_ns; /* Owning user namespace */ |
59 | |
60 | unsigned int proc_inum; |
61 | |
62 | struct proc_dir_entry *proc_net; |
63 | struct proc_dir_entry *proc_net_stat; |
64 | |
65 | #ifdef CONFIG_SYSCTL |
66 | struct ctl_table_set sysctls; |
67 | #endif |
68 | |
69 | struct sock *rtnl; /* rtnetlink socket */ |
70 | struct sock *genl_sock; |
71 | |
72 | struct list_head dev_base_head; |
73 | struct hlist_head *dev_name_head; |
74 | struct hlist_head *dev_index_head; |
75 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
76 | int ifindex; |
77 | |
78 | /* core fib_rules */ |
79 | struct list_head rules_ops; |
80 | |
81 | |
82 | struct net_device *loopback_dev; /* The loopback */ |
83 | struct netns_core core; |
84 | struct netns_mib mib; |
85 | struct netns_packet packet; |
86 | struct netns_unix unx; |
87 | struct netns_ipv4 ipv4; |
88 | #if IS_ENABLED(CONFIG_IPV6) |
89 | struct netns_ipv6 ipv6; |
90 | #endif |
91 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
92 | struct netns_sctp sctp; |
93 | #endif |
94 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
95 | struct netns_dccp dccp; |
96 | #endif |
97 | #ifdef CONFIG_NETFILTER |
98 | struct netns_nf nf; |
99 | struct netns_xt xt; |
100 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
101 | struct netns_ct ct; |
102 | #endif |
103 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
104 | struct netns_nf_frag nf_frag; |
105 | #endif |
106 | struct sock *nfnl; |
107 | struct sock *nfnl_stash; |
108 | #endif |
109 | #ifdef CONFIG_WEXT_CORE |
110 | struct sk_buff_head wext_nlevents; |
111 | #endif |
112 | struct net_generic __rcu *gen; |
113 | |
114 | /* Note : following structs are cache line aligned */ |
115 | #ifdef CONFIG_XFRM |
116 | struct netns_xfrm xfrm; |
117 | #endif |
118 | #if IS_ENABLED(CONFIG_IP_VS) |
119 | struct netns_ipvs *ipvs; |
120 | #endif |
121 | struct sock *diag_nlsk; |
122 | atomic_t rt_genid; |
123 | atomic_t fnhe_genid; |
124 | }; |
125 | |
126 | /* |
127 | * ifindex generation is per-net namespace, and loopback is |
128 | * always the 1st device in ns (see net_dev_init), thus any |
129 | * loopback device should get ifindex 1 |
130 | */ |
131 | |
132 | #define LOOPBACK_IFINDEX 1 |
133 | |
134 | #include <linux/seq_file_net.h> |
135 | |
136 | /* Init's network namespace */ |
137 | extern struct net init_net; |
138 | |
139 | #ifdef CONFIG_NET_NS |
140 | extern struct net *copy_net_ns(unsigned long flags, |
141 | struct user_namespace *user_ns, struct net *old_net); |
142 | |
143 | #else /* CONFIG_NET_NS */ |
144 | #include <linux/sched.h> |
145 | #include <linux/nsproxy.h> |
146 | static inline struct net *copy_net_ns(unsigned long flags, |
147 | struct user_namespace *user_ns, struct net *old_net) |
148 | { |
149 | if (flags & CLONE_NEWNET) |
150 | return ERR_PTR(-EINVAL); |
151 | return old_net; |
152 | } |
153 | #endif /* CONFIG_NET_NS */ |
154 | |
155 | |
156 | extern struct list_head net_namespace_list; |
157 | |
158 | extern struct net *get_net_ns_by_pid(pid_t pid); |
159 | extern struct net *get_net_ns_by_fd(int pid); |
160 | |
161 | #ifdef CONFIG_NET_NS |
162 | extern void __put_net(struct net *net); |
163 | |
164 | static inline struct net *get_net(struct net *net) |
165 | { |
166 | atomic_inc(&net->count); |
167 | return net; |
168 | } |
169 | |
170 | static inline struct net *maybe_get_net(struct net *net) |
171 | { |
172 | /* Used when we know struct net exists but we |
173 | * aren't guaranteed a previous reference count |
174 | * exists. If the reference count is zero this |
175 | * function fails and returns NULL. |
176 | */ |
177 | if (!atomic_inc_not_zero(&net->count)) |
178 | net = NULL; |
179 | return net; |
180 | } |
181 | |
182 | static inline void put_net(struct net *net) |
183 | { |
184 | if (atomic_dec_and_test(&net->count)) |
185 | __put_net(net); |
186 | } |
187 | |
188 | static inline |
189 | int net_eq(const struct net *net1, const struct net *net2) |
190 | { |
191 | return net1 == net2; |
192 | } |
193 | |
194 | extern void net_drop_ns(void *); |
195 | |
196 | #else |
197 | |
198 | static inline struct net *get_net(struct net *net) |
199 | { |
200 | return net; |
201 | } |
202 | |
203 | static inline void put_net(struct net *net) |
204 | { |
205 | } |
206 | |
207 | static inline struct net *maybe_get_net(struct net *net) |
208 | { |
209 | return net; |
210 | } |
211 | |
212 | static inline |
213 | int net_eq(const struct net *net1, const struct net *net2) |
214 | { |
215 | return 1; |
216 | } |
217 | |
218 | #define net_drop_ns NULL |
219 | #endif |
220 | |
221 | |
222 | #ifdef NETNS_REFCNT_DEBUG |
223 | static inline struct net *hold_net(struct net *net) |
224 | { |
225 | if (net) |
226 | atomic_inc(&net->use_count); |
227 | return net; |
228 | } |
229 | |
230 | static inline void release_net(struct net *net) |
231 | { |
232 | if (net) |
233 | atomic_dec(&net->use_count); |
234 | } |
235 | #else |
236 | static inline struct net *hold_net(struct net *net) |
237 | { |
238 | return net; |
239 | } |
240 | |
241 | static inline void release_net(struct net *net) |
242 | { |
243 | } |
244 | #endif |
245 | |
246 | #ifdef CONFIG_NET_NS |
247 | |
248 | static inline void write_pnet(struct net **pnet, struct net *net) |
249 | { |
250 | *pnet = net; |
251 | } |
252 | |
253 | static inline struct net *read_pnet(struct net * const *pnet) |
254 | { |
255 | return *pnet; |
256 | } |
257 | |
258 | #else |
259 | |
260 | #define write_pnet(pnet, net) do { (void)(net);} while (0) |
261 | #define read_pnet(pnet) (&init_net) |
262 | |
263 | #endif |
264 | |
265 | #define for_each_net(VAR) \ |
266 | list_for_each_entry(VAR, &net_namespace_list, list) |
267 | |
268 | #define for_each_net_rcu(VAR) \ |
269 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) |
270 | |
271 | #ifdef CONFIG_NET_NS |
272 | #define __net_init |
273 | #define __net_exit |
274 | #define __net_initdata |
275 | #define __net_initconst |
276 | #else |
277 | #define __net_init __init |
278 | #define __net_exit __exit_refok |
279 | #define __net_initdata __initdata |
280 | #define __net_initconst __initconst |
281 | #endif |
282 | |
283 | struct pernet_operations { |
284 | struct list_head list; |
285 | int (*init)(struct net *net); |
286 | void (*exit)(struct net *net); |
287 | void (*exit_batch)(struct list_head *net_exit_list); |
288 | int *id; |
289 | size_t size; |
290 | }; |
291 | |
292 | /* |
293 | * Use these carefully. If you implement a network device and it |
294 | * needs per network namespace operations use device pernet operations, |
295 | * otherwise use pernet subsys operations. |
296 | * |
297 | * Network interfaces need to be removed from a dying netns _before_ |
298 | * subsys notifiers can be called, as most of the network code cleanup |
299 | * (which is done from subsys notifiers) runs with the assumption that |
300 | * dev_remove_pack has been called so no new packets will arrive during |
301 | * and after the cleanup functions have been called. dev_remove_pack |
302 | * is not per namespace so instead the guarantee of no more packets |
303 | * arriving in a network namespace is provided by ensuring that all |
304 | * network devices and all sockets have left the network namespace |
305 | * before the cleanup methods are called. |
306 | * |
307 | * For the longest time the ipv4 icmp code was registered as a pernet |
308 | * device which caused kernel oops, and panics during network |
309 | * namespace cleanup. So please don't get this wrong. |
310 | */ |
311 | extern int register_pernet_subsys(struct pernet_operations *); |
312 | extern void unregister_pernet_subsys(struct pernet_operations *); |
313 | extern int register_pernet_device(struct pernet_operations *); |
314 | extern void unregister_pernet_device(struct pernet_operations *); |
315 | |
316 | struct ctl_table; |
317 | struct ctl_table_header; |
318 | |
319 | #ifdef CONFIG_SYSCTL |
320 | extern int net_sysctl_init(void); |
321 | extern struct ctl_table_header *register_net_sysctl(struct net *net, |
322 | const char *path, struct ctl_table *table); |
323 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
324 | #else |
325 | static inline int net_sysctl_init(void) { return 0; } |
326 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, |
327 | const char *path, struct ctl_table *table) |
328 | { |
329 | return NULL; |
330 | } |
331 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) |
332 | { |
333 | } |
334 | #endif |
335 | |
336 | static inline int rt_genid(struct net *net) |
337 | { |
338 | return atomic_read(&net->rt_genid); |
339 | } |
340 | |
341 | static inline void rt_genid_bump(struct net *net) |
342 | { |
343 | atomic_inc(&net->rt_genid); |
344 | } |
345 | |
346 | static inline int fnhe_genid(struct net *net) |
347 | { |
348 | return atomic_read(&net->fnhe_genid); |
349 | } |
350 | |
351 | static inline void fnhe_genid_bump(struct net *net) |
352 | { |
353 | atomic_inc(&net->fnhe_genid); |
354 | } |
355 | |
356 | #endif /* __NET_NET_NAMESPACE_H */ |
357 |
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