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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> |
633fc86f | 18 | #include <net/netns/ieee802154_6lowpan.h> |
4db67e80 | 19 | #include <net/netns/sctp.h> |
67019cc9 | 20 | #include <net/netns/dccp.h> |
f3c1a44a | 21 | #include <net/netns/netfilter.h> |
8d870052 | 22 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
23 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
24 | #include <net/netns/conntrack.h> | |
25 | #endif | |
99633ab2 | 26 | #include <net/netns/nftables.h> |
d62ddc21 | 27 | #include <net/netns/xfrm.h> |
a0a53c8b | 28 | |
038e7332 | 29 | struct user_namespace; |
457c4cbc | 30 | struct proc_dir_entry; |
2774c7ab | 31 | struct net_device; |
97c53cac | 32 | struct sock; |
1597fbc0 | 33 | struct ctl_table_header; |
dec827d1 | 34 | struct net_generic; |
134e6375 | 35 | struct sock; |
2553d064 | 36 | struct netns_ipvs; |
1597fbc0 | 37 | |
7c28bd0b ED |
38 | |
39 | #define NETDEV_HASHBITS 8 | |
40 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
41 | ||
5f256bec | 42 | struct net { |
a685e089 AV |
43 | atomic_t passive; /* To decided when the network |
44 | * namespace should be freed. | |
45 | */ | |
5f256bec | 46 | atomic_t count; /* To decided when the network |
a685e089 | 47 | * namespace should be shut down. |
5f256bec | 48 | */ |
5d1e4468 | 49 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
50 | atomic_t use_count; /* To track references we |
51 | * destroy on demand | |
52 | */ | |
5d1e4468 | 53 | #endif |
8e602ce2 ED |
54 | spinlock_t rules_mod_lock; |
55 | ||
5f256bec | 56 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 57 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 58 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc | 59 | |
038e7332 EB |
60 | struct user_namespace *user_ns; /* Owning user namespace */ |
61 | ||
98f842e6 EB |
62 | unsigned int proc_inum; |
63 | ||
457c4cbc EB |
64 | struct proc_dir_entry *proc_net; |
65 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 66 | |
73455092 AV |
67 | #ifdef CONFIG_SYSCTL |
68 | struct ctl_table_set sysctls; | |
69 | #endif | |
95bdfccb | 70 | |
8e602ce2 ED |
71 | struct sock *rtnl; /* rtnetlink socket */ |
72 | struct sock *genl_sock; | |
2774c7ab | 73 | |
881d966b EB |
74 | struct list_head dev_base_head; |
75 | struct hlist_head *dev_name_head; | |
76 | struct hlist_head *dev_index_head; | |
4e985ada | 77 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
aa79e66e | 78 | int ifindex; |
50624c93 | 79 | unsigned int dev_unreg_count; |
97c53cac | 80 | |
5fd30ee7 DL |
81 | /* core fib_rules */ |
82 | struct list_head rules_ops; | |
5fd30ee7 | 83 | |
d12d01d6 | 84 | |
8e602ce2 | 85 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 86 | struct netns_core core; |
852566f5 | 87 | struct netns_mib mib; |
2aaef4e4 | 88 | struct netns_packet packet; |
a0a53c8b | 89 | struct netns_unix unx; |
8afd351c | 90 | struct netns_ipv4 ipv4; |
dfd56b8b | 91 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
92 | struct netns_ipv6 ipv6; |
93 | #endif | |
633fc86f AA |
94 | #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
95 | struct netns_ieee802154_lowpan ieee802154_lowpan; | |
96 | #endif | |
4db67e80 EB |
97 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
98 | struct netns_sctp sctp; | |
99 | #endif | |
67019cc9 PE |
100 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
101 | struct netns_dccp dccp; | |
102 | #endif | |
8d870052 | 103 | #ifdef CONFIG_NETFILTER |
f3c1a44a | 104 | struct netns_nf nf; |
8d870052 | 105 | struct netns_xt xt; |
dfdb8d79 AD |
106 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
107 | struct netns_ct ct; | |
c038a767 | 108 | #endif |
99633ab2 PNA |
109 | #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) |
110 | struct netns_nftables nft; | |
111 | #endif | |
c038a767 AW |
112 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
113 | struct netns_nf_frag nf_frag; | |
dfdb8d79 | 114 | #endif |
cd8c20b6 AD |
115 | struct sock *nfnl; |
116 | struct sock *nfnl_stash; | |
d62ddc21 | 117 | #endif |
3d23e349 | 118 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 119 | struct sk_buff_head wext_nlevents; |
8d870052 | 120 | #endif |
1c87733d | 121 | struct net_generic __rcu *gen; |
8e602ce2 ED |
122 | |
123 | /* Note : following structs are cache line aligned */ | |
124 | #ifdef CONFIG_XFRM | |
125 | struct netns_xfrm xfrm; | |
126 | #endif | |
8b4d14d8 | 127 | #if IS_ENABLED(CONFIG_IP_VS) |
61b1ab45 | 128 | struct netns_ipvs *ipvs; |
8b4d14d8 | 129 | #endif |
51d7cccf | 130 | struct sock *diag_nlsk; |
5aad1de5 | 131 | atomic_t fnhe_genid; |
5f256bec EB |
132 | }; |
133 | ||
1fb9489b PE |
134 | /* |
135 | * ifindex generation is per-net namespace, and loopback is | |
136 | * always the 1st device in ns (see net_dev_init), thus any | |
137 | * loopback device should get ifindex 1 | |
138 | */ | |
139 | ||
140 | #define LOOPBACK_IFINDEX 1 | |
225c0a01 | 141 | |
c0f39322 DL |
142 | #include <linux/seq_file_net.h> |
143 | ||
4fabcd71 | 144 | /* Init's network namespace */ |
5f256bec | 145 | extern struct net init_net; |
a4aa834a | 146 | |
d727abcb | 147 | #ifdef CONFIG_NET_NS |
e67e16ea JP |
148 | struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, |
149 | struct net *old_net); | |
225c0a01 | 150 | |
d727abcb EB |
151 | #else /* CONFIG_NET_NS */ |
152 | #include <linux/sched.h> | |
153 | #include <linux/nsproxy.h> | |
038e7332 EB |
154 | static inline struct net *copy_net_ns(unsigned long flags, |
155 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 156 | { |
d727abcb EB |
157 | if (flags & CLONE_NEWNET) |
158 | return ERR_PTR(-EINVAL); | |
159 | return old_net; | |
9dd776b6 | 160 | } |
d727abcb | 161 | #endif /* CONFIG_NET_NS */ |
225c0a01 DL |
162 | |
163 | ||
164 | extern struct list_head net_namespace_list; | |
9dd776b6 | 165 | |
e67e16ea JP |
166 | struct net *get_net_ns_by_pid(pid_t pid); |
167 | struct net *get_net_ns_by_fd(int pid); | |
30ffee84 | 168 | |
535d3ae9 RK |
169 | #ifdef CONFIG_SYSCTL |
170 | void ipx_register_sysctl(void); | |
171 | void ipx_unregister_sysctl(void); | |
172 | #else | |
173 | #define ipx_register_sysctl() | |
174 | #define ipx_unregister_sysctl() | |
175 | #endif | |
176 | ||
d4655795 | 177 | #ifdef CONFIG_NET_NS |
e67e16ea | 178 | void __put_net(struct net *net); |
5f256bec EB |
179 | |
180 | static inline struct net *get_net(struct net *net) | |
181 | { | |
182 | atomic_inc(&net->count); | |
183 | return net; | |
184 | } | |
185 | ||
077130c0 EB |
186 | static inline struct net *maybe_get_net(struct net *net) |
187 | { | |
188 | /* Used when we know struct net exists but we | |
189 | * aren't guaranteed a previous reference count | |
190 | * exists. If the reference count is zero this | |
191 | * function fails and returns NULL. | |
192 | */ | |
193 | if (!atomic_inc_not_zero(&net->count)) | |
194 | net = NULL; | |
195 | return net; | |
196 | } | |
197 | ||
5f256bec EB |
198 | static inline void put_net(struct net *net) |
199 | { | |
200 | if (atomic_dec_and_test(&net->count)) | |
201 | __put_net(net); | |
202 | } | |
203 | ||
878628fb YH |
204 | static inline |
205 | int net_eq(const struct net *net1, const struct net *net2) | |
206 | { | |
207 | return net1 == net2; | |
208 | } | |
a685e089 | 209 | |
e67e16ea | 210 | void net_drop_ns(void *); |
a685e089 | 211 | |
d4655795 | 212 | #else |
b9f75f45 | 213 | |
d4655795 PE |
214 | static inline struct net *get_net(struct net *net) |
215 | { | |
216 | return net; | |
217 | } | |
218 | ||
219 | static inline void put_net(struct net *net) | |
220 | { | |
221 | } | |
222 | ||
5d1e4468 DL |
223 | static inline struct net *maybe_get_net(struct net *net) |
224 | { | |
225 | return net; | |
226 | } | |
227 | ||
228 | static inline | |
229 | int net_eq(const struct net *net1, const struct net *net2) | |
230 | { | |
231 | return 1; | |
232 | } | |
a685e089 AV |
233 | |
234 | #define net_drop_ns NULL | |
5d1e4468 DL |
235 | #endif |
236 | ||
237 | ||
238 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
239 | static inline struct net *hold_net(struct net *net) |
240 | { | |
5d1e4468 DL |
241 | if (net) |
242 | atomic_inc(&net->use_count); | |
d4655795 PE |
243 | return net; |
244 | } | |
245 | ||
246 | static inline void release_net(struct net *net) | |
247 | { | |
5d1e4468 DL |
248 | if (net) |
249 | atomic_dec(&net->use_count); | |
d4655795 | 250 | } |
5d1e4468 DL |
251 | #else |
252 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
253 | { |
254 | return net; | |
255 | } | |
878628fb | 256 | |
5d1e4468 | 257 | static inline void release_net(struct net *net) |
878628fb | 258 | { |
878628fb | 259 | } |
d4655795 | 260 | #endif |
5f256bec | 261 | |
8f424b5f ED |
262 | #ifdef CONFIG_NET_NS |
263 | ||
264 | static inline void write_pnet(struct net **pnet, struct net *net) | |
265 | { | |
266 | *pnet = net; | |
267 | } | |
268 | ||
269 | static inline struct net *read_pnet(struct net * const *pnet) | |
270 | { | |
271 | return *pnet; | |
272 | } | |
273 | ||
274 | #else | |
275 | ||
276 | #define write_pnet(pnet, net) do { (void)(net);} while (0) | |
277 | #define read_pnet(pnet) (&init_net) | |
278 | ||
279 | #endif | |
5d1e4468 | 280 | |
5f256bec EB |
281 | #define for_each_net(VAR) \ |
282 | list_for_each_entry(VAR, &net_namespace_list, list) | |
283 | ||
11a28d37 JB |
284 | #define for_each_net_rcu(VAR) \ |
285 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
286 | ||
4665079c PE |
287 | #ifdef CONFIG_NET_NS |
288 | #define __net_init | |
289 | #define __net_exit | |
022cbae6 | 290 | #define __net_initdata |
04a6f82c | 291 | #define __net_initconst |
4665079c PE |
292 | #else |
293 | #define __net_init __init | |
294 | #define __net_exit __exit_refok | |
022cbae6 | 295 | #define __net_initdata __initdata |
04a6f82c | 296 | #define __net_initconst __initconst |
4665079c | 297 | #endif |
5f256bec EB |
298 | |
299 | struct pernet_operations { | |
300 | struct list_head list; | |
301 | int (*init)(struct net *net); | |
302 | void (*exit)(struct net *net); | |
72ad937a | 303 | void (*exit_batch)(struct list_head *net_exit_list); |
f875bae0 EB |
304 | int *id; |
305 | size_t size; | |
5f256bec EB |
306 | }; |
307 | ||
17edde52 EB |
308 | /* |
309 | * Use these carefully. If you implement a network device and it | |
310 | * needs per network namespace operations use device pernet operations, | |
311 | * otherwise use pernet subsys operations. | |
312 | * | |
4edf547b JB |
313 | * Network interfaces need to be removed from a dying netns _before_ |
314 | * subsys notifiers can be called, as most of the network code cleanup | |
315 | * (which is done from subsys notifiers) runs with the assumption that | |
316 | * dev_remove_pack has been called so no new packets will arrive during | |
317 | * and after the cleanup functions have been called. dev_remove_pack | |
318 | * is not per namespace so instead the guarantee of no more packets | |
319 | * arriving in a network namespace is provided by ensuring that all | |
320 | * network devices and all sockets have left the network namespace | |
321 | * before the cleanup methods are called. | |
17edde52 EB |
322 | * |
323 | * For the longest time the ipv4 icmp code was registered as a pernet | |
324 | * device which caused kernel oops, and panics during network | |
325 | * namespace cleanup. So please don't get this wrong. | |
326 | */ | |
e67e16ea JP |
327 | int register_pernet_subsys(struct pernet_operations *); |
328 | void unregister_pernet_subsys(struct pernet_operations *); | |
329 | int register_pernet_device(struct pernet_operations *); | |
330 | void unregister_pernet_device(struct pernet_operations *); | |
f875bae0 | 331 | |
95bdfccb EB |
332 | struct ctl_table; |
333 | struct ctl_table_header; | |
d62c612e | 334 | |
2ca794e5 | 335 | #ifdef CONFIG_SYSCTL |
e67e16ea JP |
336 | int net_sysctl_init(void); |
337 | struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, | |
338 | struct ctl_table *table); | |
339 | void unregister_net_sysctl_table(struct ctl_table_header *header); | |
48c74958 EB |
340 | #else |
341 | static inline int net_sysctl_init(void) { return 0; } | |
342 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, | |
343 | const char *path, struct ctl_table *table) | |
344 | { | |
345 | return NULL; | |
346 | } | |
347 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) | |
348 | { | |
349 | } | |
350 | #endif | |
351 | ||
ca4c3fc2 | 352 | static inline int rt_genid_ipv4(struct net *net) |
b42664f8 | 353 | { |
ca4c3fc2 | 354 | return atomic_read(&net->ipv4.rt_genid); |
b42664f8 ND |
355 | } |
356 | ||
ca4c3fc2 | 357 | static inline void rt_genid_bump_ipv4(struct net *net) |
b42664f8 | 358 | { |
ca4c3fc2 | 359 | atomic_inc(&net->ipv4.rt_genid); |
360 | } | |
361 | ||
362 | #if IS_ENABLED(CONFIG_IPV6) | |
363 | static inline int rt_genid_ipv6(struct net *net) | |
364 | { | |
365 | return atomic_read(&net->ipv6.rt_genid); | |
366 | } | |
367 | ||
368 | static inline void rt_genid_bump_ipv6(struct net *net) | |
369 | { | |
370 | atomic_inc(&net->ipv6.rt_genid); | |
371 | } | |
372 | #else | |
373 | static inline int rt_genid_ipv6(struct net *net) | |
374 | { | |
375 | return 0; | |
376 | } | |
377 | ||
378 | static inline void rt_genid_bump_ipv6(struct net *net) | |
379 | { | |
380 | } | |
381 | #endif | |
382 | ||
383 | /* For callers who don't really care about whether it's IPv4 or IPv6 */ | |
384 | static inline void rt_genid_bump_all(struct net *net) | |
385 | { | |
386 | rt_genid_bump_ipv4(net); | |
387 | rt_genid_bump_ipv6(net); | |
b42664f8 | 388 | } |
95bdfccb | 389 | |
5aad1de5 TT |
390 | static inline int fnhe_genid(struct net *net) |
391 | { | |
392 | return atomic_read(&net->fnhe_genid); | |
393 | } | |
394 | ||
395 | static inline void fnhe_genid_bump(struct net *net) | |
396 | { | |
397 | atomic_inc(&net->fnhe_genid); | |
398 | } | |
399 | ||
5f256bec | 400 | #endif /* __NET_NET_NAMESPACE_H */ |