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 | ||
60063497 | 7 | #include <linux/atomic.h> |
5f256bec EB |
8 | #include <linux/workqueue.h> |
9 | #include <linux/list.h> | |
bee95250 | 10 | #include <linux/sysctl.h> |
5f256bec | 11 | |
8efa6e93 | 12 | #include <net/netns/core.h> |
852566f5 | 13 | #include <net/netns/mib.h> |
a0a53c8b | 14 | #include <net/netns/unix.h> |
2aaef4e4 | 15 | #include <net/netns/packet.h> |
8afd351c | 16 | #include <net/netns/ipv4.h> |
b0f159db | 17 | #include <net/netns/ipv6.h> |
4db67e80 | 18 | #include <net/netns/sctp.h> |
67019cc9 | 19 | #include <net/netns/dccp.h> |
f3c1a44a | 20 | #include <net/netns/netfilter.h> |
8d870052 | 21 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
22 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
23 | #include <net/netns/conntrack.h> | |
24 | #endif | |
d62ddc21 | 25 | #include <net/netns/xfrm.h> |
a0a53c8b | 26 | |
038e7332 | 27 | struct user_namespace; |
457c4cbc | 28 | struct proc_dir_entry; |
2774c7ab | 29 | struct net_device; |
97c53cac | 30 | struct sock; |
1597fbc0 | 31 | struct ctl_table_header; |
dec827d1 | 32 | struct net_generic; |
134e6375 | 33 | struct sock; |
2553d064 | 34 | struct netns_ipvs; |
1597fbc0 | 35 | |
7c28bd0b ED |
36 | |
37 | #define NETDEV_HASHBITS 8 | |
38 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
39 | ||
5f256bec | 40 | struct net { |
a685e089 AV |
41 | atomic_t passive; /* To decided when the network |
42 | * namespace should be freed. | |
43 | */ | |
5f256bec | 44 | atomic_t count; /* To decided when the network |
a685e089 | 45 | * namespace should be shut down. |
5f256bec | 46 | */ |
5d1e4468 | 47 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
48 | atomic_t use_count; /* To track references we |
49 | * destroy on demand | |
50 | */ | |
5d1e4468 | 51 | #endif |
8e602ce2 ED |
52 | spinlock_t rules_mod_lock; |
53 | ||
5f256bec | 54 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 55 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 56 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc | 57 | |
038e7332 EB |
58 | struct user_namespace *user_ns; /* Owning user namespace */ |
59 | ||
98f842e6 EB |
60 | unsigned int proc_inum; |
61 | ||
457c4cbc EB |
62 | struct proc_dir_entry *proc_net; |
63 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 64 | |
73455092 AV |
65 | #ifdef CONFIG_SYSCTL |
66 | struct ctl_table_set sysctls; | |
67 | #endif | |
95bdfccb | 68 | |
8e602ce2 ED |
69 | struct sock *rtnl; /* rtnetlink socket */ |
70 | struct sock *genl_sock; | |
2774c7ab | 71 | |
881d966b EB |
72 | struct list_head dev_base_head; |
73 | struct hlist_head *dev_name_head; | |
74 | struct hlist_head *dev_index_head; | |
4e985ada | 75 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
aa79e66e | 76 | int ifindex; |
50624c93 | 77 | unsigned int dev_unreg_count; |
97c53cac | 78 | |
5fd30ee7 DL |
79 | /* core fib_rules */ |
80 | struct list_head rules_ops; | |
5fd30ee7 | 81 | |
d12d01d6 | 82 | |
8e602ce2 | 83 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 84 | struct netns_core core; |
852566f5 | 85 | struct netns_mib mib; |
2aaef4e4 | 86 | struct netns_packet packet; |
a0a53c8b | 87 | struct netns_unix unx; |
8afd351c | 88 | struct netns_ipv4 ipv4; |
dfd56b8b | 89 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
90 | struct netns_ipv6 ipv6; |
91 | #endif | |
4db67e80 EB |
92 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
93 | struct netns_sctp sctp; | |
94 | #endif | |
67019cc9 PE |
95 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
96 | struct netns_dccp dccp; | |
97 | #endif | |
8d870052 | 98 | #ifdef CONFIG_NETFILTER |
f3c1a44a | 99 | struct netns_nf nf; |
8d870052 | 100 | struct netns_xt xt; |
dfdb8d79 AD |
101 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
102 | struct netns_ct ct; | |
c038a767 AW |
103 | #endif |
104 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) | |
105 | struct netns_nf_frag nf_frag; | |
dfdb8d79 | 106 | #endif |
cd8c20b6 AD |
107 | struct sock *nfnl; |
108 | struct sock *nfnl_stash; | |
d62ddc21 | 109 | #endif |
3d23e349 | 110 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 111 | struct sk_buff_head wext_nlevents; |
8d870052 | 112 | #endif |
1c87733d | 113 | struct net_generic __rcu *gen; |
8e602ce2 ED |
114 | |
115 | /* Note : following structs are cache line aligned */ | |
116 | #ifdef CONFIG_XFRM | |
117 | struct netns_xfrm xfrm; | |
118 | #endif | |
8b4d14d8 | 119 | #if IS_ENABLED(CONFIG_IP_VS) |
61b1ab45 | 120 | struct netns_ipvs *ipvs; |
8b4d14d8 | 121 | #endif |
51d7cccf | 122 | struct sock *diag_nlsk; |
5aad1de5 | 123 | atomic_t fnhe_genid; |
5f256bec EB |
124 | }; |
125 | ||
1fb9489b PE |
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 | |
225c0a01 | 133 | |
c0f39322 DL |
134 | #include <linux/seq_file_net.h> |
135 | ||
4fabcd71 | 136 | /* Init's network namespace */ |
5f256bec | 137 | extern struct net init_net; |
a4aa834a | 138 | |
d727abcb | 139 | #ifdef CONFIG_NET_NS |
038e7332 EB |
140 | extern struct net *copy_net_ns(unsigned long flags, |
141 | struct user_namespace *user_ns, struct net *old_net); | |
225c0a01 | 142 | |
d727abcb EB |
143 | #else /* CONFIG_NET_NS */ |
144 | #include <linux/sched.h> | |
145 | #include <linux/nsproxy.h> | |
038e7332 EB |
146 | static inline struct net *copy_net_ns(unsigned long flags, |
147 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 148 | { |
d727abcb EB |
149 | if (flags & CLONE_NEWNET) |
150 | return ERR_PTR(-EINVAL); | |
151 | return old_net; | |
9dd776b6 | 152 | } |
d727abcb | 153 | #endif /* CONFIG_NET_NS */ |
225c0a01 DL |
154 | |
155 | ||
156 | extern struct list_head net_namespace_list; | |
9dd776b6 | 157 | |
30ffee84 | 158 | extern struct net *get_net_ns_by_pid(pid_t pid); |
f0630529 | 159 | extern struct net *get_net_ns_by_fd(int pid); |
30ffee84 | 160 | |
d4655795 | 161 | #ifdef CONFIG_NET_NS |
5f256bec EB |
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 | ||
077130c0 EB |
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 | ||
5f256bec EB |
182 | static inline void put_net(struct net *net) |
183 | { | |
184 | if (atomic_dec_and_test(&net->count)) | |
185 | __put_net(net); | |
186 | } | |
187 | ||
878628fb YH |
188 | static inline |
189 | int net_eq(const struct net *net1, const struct net *net2) | |
190 | { | |
191 | return net1 == net2; | |
192 | } | |
a685e089 AV |
193 | |
194 | extern void net_drop_ns(void *); | |
195 | ||
d4655795 | 196 | #else |
b9f75f45 | 197 | |
d4655795 PE |
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 | ||
5d1e4468 DL |
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 | } | |
a685e089 AV |
217 | |
218 | #define net_drop_ns NULL | |
5d1e4468 DL |
219 | #endif |
220 | ||
221 | ||
222 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
223 | static inline struct net *hold_net(struct net *net) |
224 | { | |
5d1e4468 DL |
225 | if (net) |
226 | atomic_inc(&net->use_count); | |
d4655795 PE |
227 | return net; |
228 | } | |
229 | ||
230 | static inline void release_net(struct net *net) | |
231 | { | |
5d1e4468 DL |
232 | if (net) |
233 | atomic_dec(&net->use_count); | |
d4655795 | 234 | } |
5d1e4468 DL |
235 | #else |
236 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
237 | { |
238 | return net; | |
239 | } | |
878628fb | 240 | |
5d1e4468 | 241 | static inline void release_net(struct net *net) |
878628fb | 242 | { |
878628fb | 243 | } |
d4655795 | 244 | #endif |
5f256bec | 245 | |
8f424b5f ED |
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 | |
5d1e4468 | 264 | |
5f256bec EB |
265 | #define for_each_net(VAR) \ |
266 | list_for_each_entry(VAR, &net_namespace_list, list) | |
267 | ||
11a28d37 JB |
268 | #define for_each_net_rcu(VAR) \ |
269 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
270 | ||
4665079c PE |
271 | #ifdef CONFIG_NET_NS |
272 | #define __net_init | |
273 | #define __net_exit | |
022cbae6 | 274 | #define __net_initdata |
04a6f82c | 275 | #define __net_initconst |
4665079c PE |
276 | #else |
277 | #define __net_init __init | |
278 | #define __net_exit __exit_refok | |
022cbae6 | 279 | #define __net_initdata __initdata |
04a6f82c | 280 | #define __net_initconst __initconst |
4665079c | 281 | #endif |
5f256bec EB |
282 | |
283 | struct pernet_operations { | |
284 | struct list_head list; | |
285 | int (*init)(struct net *net); | |
286 | void (*exit)(struct net *net); | |
72ad937a | 287 | void (*exit_batch)(struct list_head *net_exit_list); |
f875bae0 EB |
288 | int *id; |
289 | size_t size; | |
5f256bec EB |
290 | }; |
291 | ||
17edde52 EB |
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 | * | |
4edf547b JB |
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. | |
17edde52 EB |
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 | */ | |
5f256bec EB |
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 *); | |
f875bae0 | 315 | |
95bdfccb EB |
316 | struct ctl_table; |
317 | struct ctl_table_header; | |
d62c612e | 318 | |
2ca794e5 EB |
319 | #ifdef CONFIG_SYSCTL |
320 | extern int net_sysctl_init(void); | |
ab41a2ca EB |
321 | extern struct ctl_table_header *register_net_sysctl(struct net *net, |
322 | const char *path, struct ctl_table *table); | |
95bdfccb | 323 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
48c74958 EB |
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 | ||
ca4c3fc2 | 336 | static inline int rt_genid_ipv4(struct net *net) |
b42664f8 | 337 | { |
ca4c3fc2 | 338 | return atomic_read(&net->ipv4.rt_genid); |
b42664f8 ND |
339 | } |
340 | ||
ca4c3fc2 | 341 | static inline void rt_genid_bump_ipv4(struct net *net) |
b42664f8 | 342 | { |
ca4c3fc2 | 343 | atomic_inc(&net->ipv4.rt_genid); |
344 | } | |
345 | ||
346 | #if IS_ENABLED(CONFIG_IPV6) | |
347 | static inline int rt_genid_ipv6(struct net *net) | |
348 | { | |
349 | return atomic_read(&net->ipv6.rt_genid); | |
350 | } | |
351 | ||
352 | static inline void rt_genid_bump_ipv6(struct net *net) | |
353 | { | |
354 | atomic_inc(&net->ipv6.rt_genid); | |
355 | } | |
356 | #else | |
357 | static inline int rt_genid_ipv6(struct net *net) | |
358 | { | |
359 | return 0; | |
360 | } | |
361 | ||
362 | static inline void rt_genid_bump_ipv6(struct net *net) | |
363 | { | |
364 | } | |
365 | #endif | |
366 | ||
367 | /* For callers who don't really care about whether it's IPv4 or IPv6 */ | |
368 | static inline void rt_genid_bump_all(struct net *net) | |
369 | { | |
370 | rt_genid_bump_ipv4(net); | |
371 | rt_genid_bump_ipv6(net); | |
b42664f8 | 372 | } |
95bdfccb | 373 | |
5aad1de5 TT |
374 | static inline int fnhe_genid(struct net *net) |
375 | { | |
376 | return atomic_read(&net->fnhe_genid); | |
377 | } | |
378 | ||
379 | static inline void fnhe_genid_bump(struct net *net) | |
380 | { | |
381 | atomic_inc(&net->fnhe_genid); | |
382 | } | |
383 | ||
5f256bec | 384 | #endif /* __NET_NET_NAMESPACE_H */ |