Commit | Line | Data |
---|---|---|
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 | |
99633ab2 | 25 | #include <net/netns/nftables.h> |
d62ddc21 | 26 | #include <net/netns/xfrm.h> |
a0a53c8b | 27 | |
038e7332 | 28 | struct user_namespace; |
457c4cbc | 29 | struct proc_dir_entry; |
2774c7ab | 30 | struct net_device; |
97c53cac | 31 | struct sock; |
1597fbc0 | 32 | struct ctl_table_header; |
dec827d1 | 33 | struct net_generic; |
134e6375 | 34 | struct sock; |
2553d064 | 35 | struct netns_ipvs; |
1597fbc0 | 36 | |
7c28bd0b ED |
37 | |
38 | #define NETDEV_HASHBITS 8 | |
39 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
40 | ||
5f256bec | 41 | struct net { |
a685e089 AV |
42 | atomic_t passive; /* To decided when the network |
43 | * namespace should be freed. | |
44 | */ | |
5f256bec | 45 | atomic_t count; /* To decided when the network |
a685e089 | 46 | * namespace should be shut down. |
5f256bec | 47 | */ |
5d1e4468 | 48 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
49 | atomic_t use_count; /* To track references we |
50 | * destroy on demand | |
51 | */ | |
5d1e4468 | 52 | #endif |
8e602ce2 ED |
53 | spinlock_t rules_mod_lock; |
54 | ||
5f256bec | 55 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 56 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 57 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc | 58 | |
038e7332 EB |
59 | struct user_namespace *user_ns; /* Owning user namespace */ |
60 | ||
98f842e6 EB |
61 | unsigned int proc_inum; |
62 | ||
457c4cbc EB |
63 | struct proc_dir_entry *proc_net; |
64 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 65 | |
73455092 AV |
66 | #ifdef CONFIG_SYSCTL |
67 | struct ctl_table_set sysctls; | |
68 | #endif | |
95bdfccb | 69 | |
8e602ce2 ED |
70 | struct sock *rtnl; /* rtnetlink socket */ |
71 | struct sock *genl_sock; | |
2774c7ab | 72 | |
881d966b EB |
73 | struct list_head dev_base_head; |
74 | struct hlist_head *dev_name_head; | |
75 | struct hlist_head *dev_index_head; | |
4e985ada | 76 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
aa79e66e | 77 | int ifindex; |
50624c93 | 78 | unsigned int dev_unreg_count; |
97c53cac | 79 | |
5fd30ee7 DL |
80 | /* core fib_rules */ |
81 | struct list_head rules_ops; | |
5fd30ee7 | 82 | |
d12d01d6 | 83 | |
8e602ce2 | 84 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 85 | struct netns_core core; |
852566f5 | 86 | struct netns_mib mib; |
2aaef4e4 | 87 | struct netns_packet packet; |
a0a53c8b | 88 | struct netns_unix unx; |
8afd351c | 89 | struct netns_ipv4 ipv4; |
dfd56b8b | 90 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
91 | struct netns_ipv6 ipv6; |
92 | #endif | |
4db67e80 EB |
93 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
94 | struct netns_sctp sctp; | |
95 | #endif | |
67019cc9 PE |
96 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
97 | struct netns_dccp dccp; | |
98 | #endif | |
8d870052 | 99 | #ifdef CONFIG_NETFILTER |
f3c1a44a | 100 | struct netns_nf nf; |
8d870052 | 101 | struct netns_xt xt; |
dfdb8d79 AD |
102 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
103 | struct netns_ct ct; | |
c038a767 | 104 | #endif |
99633ab2 PNA |
105 | #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) |
106 | struct netns_nftables nft; | |
107 | #endif | |
c038a767 AW |
108 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
109 | struct netns_nf_frag nf_frag; | |
dfdb8d79 | 110 | #endif |
cd8c20b6 AD |
111 | struct sock *nfnl; |
112 | struct sock *nfnl_stash; | |
d62ddc21 | 113 | #endif |
3d23e349 | 114 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 115 | struct sk_buff_head wext_nlevents; |
8d870052 | 116 | #endif |
1c87733d | 117 | struct net_generic __rcu *gen; |
8e602ce2 ED |
118 | |
119 | /* Note : following structs are cache line aligned */ | |
120 | #ifdef CONFIG_XFRM | |
121 | struct netns_xfrm xfrm; | |
122 | #endif | |
8b4d14d8 | 123 | #if IS_ENABLED(CONFIG_IP_VS) |
61b1ab45 | 124 | struct netns_ipvs *ipvs; |
8b4d14d8 | 125 | #endif |
51d7cccf | 126 | struct sock *diag_nlsk; |
5aad1de5 | 127 | atomic_t fnhe_genid; |
5f256bec EB |
128 | }; |
129 | ||
1fb9489b PE |
130 | /* |
131 | * ifindex generation is per-net namespace, and loopback is | |
132 | * always the 1st device in ns (see net_dev_init), thus any | |
133 | * loopback device should get ifindex 1 | |
134 | */ | |
135 | ||
136 | #define LOOPBACK_IFINDEX 1 | |
225c0a01 | 137 | |
c0f39322 DL |
138 | #include <linux/seq_file_net.h> |
139 | ||
4fabcd71 | 140 | /* Init's network namespace */ |
5f256bec | 141 | extern struct net init_net; |
a4aa834a | 142 | |
d727abcb | 143 | #ifdef CONFIG_NET_NS |
e67e16ea JP |
144 | struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, |
145 | struct net *old_net); | |
225c0a01 | 146 | |
d727abcb EB |
147 | #else /* CONFIG_NET_NS */ |
148 | #include <linux/sched.h> | |
149 | #include <linux/nsproxy.h> | |
038e7332 EB |
150 | static inline struct net *copy_net_ns(unsigned long flags, |
151 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 152 | { |
d727abcb EB |
153 | if (flags & CLONE_NEWNET) |
154 | return ERR_PTR(-EINVAL); | |
155 | return old_net; | |
9dd776b6 | 156 | } |
d727abcb | 157 | #endif /* CONFIG_NET_NS */ |
225c0a01 DL |
158 | |
159 | ||
160 | extern struct list_head net_namespace_list; | |
9dd776b6 | 161 | |
e67e16ea JP |
162 | struct net *get_net_ns_by_pid(pid_t pid); |
163 | struct net *get_net_ns_by_fd(int pid); | |
30ffee84 | 164 | |
d4655795 | 165 | #ifdef CONFIG_NET_NS |
e67e16ea | 166 | void __put_net(struct net *net); |
5f256bec EB |
167 | |
168 | static inline struct net *get_net(struct net *net) | |
169 | { | |
170 | atomic_inc(&net->count); | |
171 | return net; | |
172 | } | |
173 | ||
077130c0 EB |
174 | static inline struct net *maybe_get_net(struct net *net) |
175 | { | |
176 | /* Used when we know struct net exists but we | |
177 | * aren't guaranteed a previous reference count | |
178 | * exists. If the reference count is zero this | |
179 | * function fails and returns NULL. | |
180 | */ | |
181 | if (!atomic_inc_not_zero(&net->count)) | |
182 | net = NULL; | |
183 | return net; | |
184 | } | |
185 | ||
5f256bec EB |
186 | static inline void put_net(struct net *net) |
187 | { | |
188 | if (atomic_dec_and_test(&net->count)) | |
189 | __put_net(net); | |
190 | } | |
191 | ||
878628fb YH |
192 | static inline |
193 | int net_eq(const struct net *net1, const struct net *net2) | |
194 | { | |
195 | return net1 == net2; | |
196 | } | |
a685e089 | 197 | |
e67e16ea | 198 | void net_drop_ns(void *); |
a685e089 | 199 | |
d4655795 | 200 | #else |
b9f75f45 | 201 | |
d4655795 PE |
202 | static inline struct net *get_net(struct net *net) |
203 | { | |
204 | return net; | |
205 | } | |
206 | ||
207 | static inline void put_net(struct net *net) | |
208 | { | |
209 | } | |
210 | ||
5d1e4468 DL |
211 | static inline struct net *maybe_get_net(struct net *net) |
212 | { | |
213 | return net; | |
214 | } | |
215 | ||
216 | static inline | |
217 | int net_eq(const struct net *net1, const struct net *net2) | |
218 | { | |
219 | return 1; | |
220 | } | |
a685e089 AV |
221 | |
222 | #define net_drop_ns NULL | |
5d1e4468 DL |
223 | #endif |
224 | ||
225 | ||
226 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
227 | static inline struct net *hold_net(struct net *net) |
228 | { | |
5d1e4468 DL |
229 | if (net) |
230 | atomic_inc(&net->use_count); | |
d4655795 PE |
231 | return net; |
232 | } | |
233 | ||
234 | static inline void release_net(struct net *net) | |
235 | { | |
5d1e4468 DL |
236 | if (net) |
237 | atomic_dec(&net->use_count); | |
d4655795 | 238 | } |
5d1e4468 DL |
239 | #else |
240 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
241 | { |
242 | return net; | |
243 | } | |
878628fb | 244 | |
5d1e4468 | 245 | static inline void release_net(struct net *net) |
878628fb | 246 | { |
878628fb | 247 | } |
d4655795 | 248 | #endif |
5f256bec | 249 | |
8f424b5f ED |
250 | #ifdef CONFIG_NET_NS |
251 | ||
252 | static inline void write_pnet(struct net **pnet, struct net *net) | |
253 | { | |
254 | *pnet = net; | |
255 | } | |
256 | ||
257 | static inline struct net *read_pnet(struct net * const *pnet) | |
258 | { | |
259 | return *pnet; | |
260 | } | |
261 | ||
262 | #else | |
263 | ||
264 | #define write_pnet(pnet, net) do { (void)(net);} while (0) | |
265 | #define read_pnet(pnet) (&init_net) | |
266 | ||
267 | #endif | |
5d1e4468 | 268 | |
5f256bec EB |
269 | #define for_each_net(VAR) \ |
270 | list_for_each_entry(VAR, &net_namespace_list, list) | |
271 | ||
11a28d37 JB |
272 | #define for_each_net_rcu(VAR) \ |
273 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
274 | ||
4665079c PE |
275 | #ifdef CONFIG_NET_NS |
276 | #define __net_init | |
277 | #define __net_exit | |
022cbae6 | 278 | #define __net_initdata |
04a6f82c | 279 | #define __net_initconst |
4665079c PE |
280 | #else |
281 | #define __net_init __init | |
282 | #define __net_exit __exit_refok | |
022cbae6 | 283 | #define __net_initdata __initdata |
04a6f82c | 284 | #define __net_initconst __initconst |
4665079c | 285 | #endif |
5f256bec EB |
286 | |
287 | struct pernet_operations { | |
288 | struct list_head list; | |
289 | int (*init)(struct net *net); | |
290 | void (*exit)(struct net *net); | |
72ad937a | 291 | void (*exit_batch)(struct list_head *net_exit_list); |
f875bae0 EB |
292 | int *id; |
293 | size_t size; | |
5f256bec EB |
294 | }; |
295 | ||
17edde52 EB |
296 | /* |
297 | * Use these carefully. If you implement a network device and it | |
298 | * needs per network namespace operations use device pernet operations, | |
299 | * otherwise use pernet subsys operations. | |
300 | * | |
4edf547b JB |
301 | * Network interfaces need to be removed from a dying netns _before_ |
302 | * subsys notifiers can be called, as most of the network code cleanup | |
303 | * (which is done from subsys notifiers) runs with the assumption that | |
304 | * dev_remove_pack has been called so no new packets will arrive during | |
305 | * and after the cleanup functions have been called. dev_remove_pack | |
306 | * is not per namespace so instead the guarantee of no more packets | |
307 | * arriving in a network namespace is provided by ensuring that all | |
308 | * network devices and all sockets have left the network namespace | |
309 | * before the cleanup methods are called. | |
17edde52 EB |
310 | * |
311 | * For the longest time the ipv4 icmp code was registered as a pernet | |
312 | * device which caused kernel oops, and panics during network | |
313 | * namespace cleanup. So please don't get this wrong. | |
314 | */ | |
e67e16ea JP |
315 | int register_pernet_subsys(struct pernet_operations *); |
316 | void unregister_pernet_subsys(struct pernet_operations *); | |
317 | int register_pernet_device(struct pernet_operations *); | |
318 | void unregister_pernet_device(struct pernet_operations *); | |
f875bae0 | 319 | |
95bdfccb EB |
320 | struct ctl_table; |
321 | struct ctl_table_header; | |
d62c612e | 322 | |
2ca794e5 | 323 | #ifdef CONFIG_SYSCTL |
e67e16ea JP |
324 | int net_sysctl_init(void); |
325 | struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, | |
326 | struct ctl_table *table); | |
327 | void unregister_net_sysctl_table(struct ctl_table_header *header); | |
48c74958 EB |
328 | #else |
329 | static inline int net_sysctl_init(void) { return 0; } | |
330 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, | |
331 | const char *path, struct ctl_table *table) | |
332 | { | |
333 | return NULL; | |
334 | } | |
335 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) | |
336 | { | |
337 | } | |
338 | #endif | |
339 | ||
ca4c3fc2 | 340 | static inline int rt_genid_ipv4(struct net *net) |
b42664f8 | 341 | { |
ca4c3fc2 | 342 | return atomic_read(&net->ipv4.rt_genid); |
b42664f8 ND |
343 | } |
344 | ||
ca4c3fc2 | 345 | static inline void rt_genid_bump_ipv4(struct net *net) |
b42664f8 | 346 | { |
ca4c3fc2 | 347 | atomic_inc(&net->ipv4.rt_genid); |
348 | } | |
349 | ||
350 | #if IS_ENABLED(CONFIG_IPV6) | |
351 | static inline int rt_genid_ipv6(struct net *net) | |
352 | { | |
353 | return atomic_read(&net->ipv6.rt_genid); | |
354 | } | |
355 | ||
356 | static inline void rt_genid_bump_ipv6(struct net *net) | |
357 | { | |
358 | atomic_inc(&net->ipv6.rt_genid); | |
359 | } | |
360 | #else | |
361 | static inline int rt_genid_ipv6(struct net *net) | |
362 | { | |
363 | return 0; | |
364 | } | |
365 | ||
366 | static inline void rt_genid_bump_ipv6(struct net *net) | |
367 | { | |
368 | } | |
369 | #endif | |
370 | ||
371 | /* For callers who don't really care about whether it's IPv4 or IPv6 */ | |
372 | static inline void rt_genid_bump_all(struct net *net) | |
373 | { | |
374 | rt_genid_bump_ipv4(net); | |
375 | rt_genid_bump_ipv6(net); | |
b42664f8 | 376 | } |
95bdfccb | 377 | |
5aad1de5 TT |
378 | static inline int fnhe_genid(struct net *net) |
379 | { | |
380 | return atomic_read(&net->fnhe_genid); | |
381 | } | |
382 | ||
383 | static inline void fnhe_genid_bump(struct net *net) | |
384 | { | |
385 | atomic_inc(&net->fnhe_genid); | |
386 | } | |
387 | ||
5f256bec | 388 | #endif /* __NET_NET_NAMESPACE_H */ |