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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> |
c122e14d | 8 | #include <linux/refcount.h> |
5f256bec EB |
9 | #include <linux/workqueue.h> |
10 | #include <linux/list.h> | |
bee95250 | 11 | #include <linux/sysctl.h> |
5f256bec | 12 | |
6a662719 | 13 | #include <net/flow.h> |
8efa6e93 | 14 | #include <net/netns/core.h> |
852566f5 | 15 | #include <net/netns/mib.h> |
a0a53c8b | 16 | #include <net/netns/unix.h> |
2aaef4e4 | 17 | #include <net/netns/packet.h> |
8afd351c | 18 | #include <net/netns/ipv4.h> |
b0f159db | 19 | #include <net/netns/ipv6.h> |
633fc86f | 20 | #include <net/netns/ieee802154_6lowpan.h> |
4db67e80 | 21 | #include <net/netns/sctp.h> |
67019cc9 | 22 | #include <net/netns/dccp.h> |
f3c1a44a | 23 | #include <net/netns/netfilter.h> |
8d870052 | 24 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
25 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
26 | #include <net/netns/conntrack.h> | |
27 | #endif | |
99633ab2 | 28 | #include <net/netns/nftables.h> |
d62ddc21 | 29 | #include <net/netns/xfrm.h> |
0189197f | 30 | #include <net/netns/mpls.h> |
8e8cda6d | 31 | #include <net/netns/can.h> |
435d5f4b | 32 | #include <linux/ns_common.h> |
04c52dec PNA |
33 | #include <linux/idr.h> |
34 | #include <linux/skbuff.h> | |
a0a53c8b | 35 | |
038e7332 | 36 | struct user_namespace; |
457c4cbc | 37 | struct proc_dir_entry; |
2774c7ab | 38 | struct net_device; |
97c53cac | 39 | struct sock; |
1597fbc0 | 40 | struct ctl_table_header; |
dec827d1 | 41 | struct net_generic; |
134e6375 | 42 | struct sock; |
2553d064 | 43 | struct netns_ipvs; |
1597fbc0 | 44 | |
7c28bd0b ED |
45 | |
46 | #define NETDEV_HASHBITS 8 | |
47 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
48 | ||
5f256bec | 49 | struct net { |
c122e14d | 50 | refcount_t passive; /* To decided when the network |
a685e089 AV |
51 | * namespace should be freed. |
52 | */ | |
5f256bec | 53 | atomic_t count; /* To decided when the network |
a685e089 | 54 | * namespace should be shut down. |
5f256bec | 55 | */ |
8e602ce2 ED |
56 | spinlock_t rules_mod_lock; |
57 | ||
33cf7c90 ED |
58 | atomic64_t cookie_gen; |
59 | ||
5f256bec | 60 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 61 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 62 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc | 63 | |
038e7332 | 64 | struct user_namespace *user_ns; /* Owning user namespace */ |
70328660 | 65 | struct ucounts *ucounts; |
de133464 | 66 | spinlock_t nsid_lock; |
0c7aecd4 | 67 | struct idr netns_ids; |
038e7332 | 68 | |
435d5f4b | 69 | struct ns_common ns; |
98f842e6 | 70 | |
457c4cbc EB |
71 | struct proc_dir_entry *proc_net; |
72 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 73 | |
73455092 AV |
74 | #ifdef CONFIG_SYSCTL |
75 | struct ctl_table_set sysctls; | |
76 | #endif | |
95bdfccb | 77 | |
8e602ce2 ED |
78 | struct sock *rtnl; /* rtnetlink socket */ |
79 | struct sock *genl_sock; | |
2774c7ab | 80 | |
881d966b EB |
81 | struct list_head dev_base_head; |
82 | struct hlist_head *dev_name_head; | |
83 | struct hlist_head *dev_index_head; | |
4e985ada | 84 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
aa79e66e | 85 | int ifindex; |
50624c93 | 86 | unsigned int dev_unreg_count; |
97c53cac | 87 | |
5fd30ee7 DL |
88 | /* core fib_rules */ |
89 | struct list_head rules_ops; | |
5fd30ee7 | 90 | |
d12d01d6 | 91 | |
8e602ce2 | 92 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 93 | struct netns_core core; |
852566f5 | 94 | struct netns_mib mib; |
2aaef4e4 | 95 | struct netns_packet packet; |
a0a53c8b | 96 | struct netns_unix unx; |
8afd351c | 97 | struct netns_ipv4 ipv4; |
dfd56b8b | 98 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
99 | struct netns_ipv6 ipv6; |
100 | #endif | |
633fc86f AA |
101 | #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
102 | struct netns_ieee802154_lowpan ieee802154_lowpan; | |
103 | #endif | |
4db67e80 EB |
104 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
105 | struct netns_sctp sctp; | |
106 | #endif | |
67019cc9 PE |
107 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
108 | struct netns_dccp dccp; | |
109 | #endif | |
8d870052 | 110 | #ifdef CONFIG_NETFILTER |
f3c1a44a | 111 | struct netns_nf nf; |
8d870052 | 112 | struct netns_xt xt; |
dfdb8d79 AD |
113 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
114 | struct netns_ct ct; | |
c038a767 | 115 | #endif |
99633ab2 PNA |
116 | #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) |
117 | struct netns_nftables nft; | |
118 | #endif | |
c038a767 AW |
119 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
120 | struct netns_nf_frag nf_frag; | |
dfdb8d79 | 121 | #endif |
cd8c20b6 AD |
122 | struct sock *nfnl; |
123 | struct sock *nfnl_stash; | |
3499abb2 AS |
124 | #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT) |
125 | struct list_head nfnl_acct_list; | |
126 | #endif | |
19576c94 PN |
127 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
128 | struct list_head nfct_timeout_list; | |
129 | #endif | |
d62ddc21 | 130 | #endif |
3d23e349 | 131 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 132 | struct sk_buff_head wext_nlevents; |
8d870052 | 133 | #endif |
1c87733d | 134 | struct net_generic __rcu *gen; |
8e602ce2 ED |
135 | |
136 | /* Note : following structs are cache line aligned */ | |
137 | #ifdef CONFIG_XFRM | |
138 | struct netns_xfrm xfrm; | |
139 | #endif | |
8b4d14d8 | 140 | #if IS_ENABLED(CONFIG_IP_VS) |
61b1ab45 | 141 | struct netns_ipvs *ipvs; |
0189197f EB |
142 | #endif |
143 | #if IS_ENABLED(CONFIG_MPLS) | |
144 | struct netns_mpls mpls; | |
8e8cda6d MK |
145 | #endif |
146 | #if IS_ENABLED(CONFIG_CAN) | |
147 | struct netns_can can; | |
8b4d14d8 | 148 | #endif |
51d7cccf | 149 | struct sock *diag_nlsk; |
5aad1de5 | 150 | atomic_t fnhe_genid; |
3859a271 | 151 | } __randomize_layout; |
5f256bec | 152 | |
c0f39322 DL |
153 | #include <linux/seq_file_net.h> |
154 | ||
4fabcd71 | 155 | /* Init's network namespace */ |
5f256bec | 156 | extern struct net init_net; |
a4aa834a | 157 | |
d727abcb | 158 | #ifdef CONFIG_NET_NS |
e67e16ea JP |
159 | struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, |
160 | struct net *old_net); | |
225c0a01 | 161 | |
7866cc57 | 162 | void net_ns_barrier(void); |
d727abcb EB |
163 | #else /* CONFIG_NET_NS */ |
164 | #include <linux/sched.h> | |
165 | #include <linux/nsproxy.h> | |
038e7332 EB |
166 | static inline struct net *copy_net_ns(unsigned long flags, |
167 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 168 | { |
d727abcb EB |
169 | if (flags & CLONE_NEWNET) |
170 | return ERR_PTR(-EINVAL); | |
171 | return old_net; | |
9dd776b6 | 172 | } |
7866cc57 FW |
173 | |
174 | static inline void net_ns_barrier(void) {} | |
d727abcb | 175 | #endif /* CONFIG_NET_NS */ |
225c0a01 DL |
176 | |
177 | ||
178 | extern struct list_head net_namespace_list; | |
9dd776b6 | 179 | |
e67e16ea | 180 | struct net *get_net_ns_by_pid(pid_t pid); |
0f5258cd | 181 | struct net *get_net_ns_by_fd(int fd); |
30ffee84 | 182 | |
535d3ae9 RK |
183 | #ifdef CONFIG_SYSCTL |
184 | void ipx_register_sysctl(void); | |
185 | void ipx_unregister_sysctl(void); | |
186 | #else | |
187 | #define ipx_register_sysctl() | |
188 | #define ipx_unregister_sysctl() | |
189 | #endif | |
190 | ||
d4655795 | 191 | #ifdef CONFIG_NET_NS |
e67e16ea | 192 | void __put_net(struct net *net); |
5f256bec EB |
193 | |
194 | static inline struct net *get_net(struct net *net) | |
195 | { | |
196 | atomic_inc(&net->count); | |
197 | return net; | |
198 | } | |
199 | ||
077130c0 EB |
200 | static inline struct net *maybe_get_net(struct net *net) |
201 | { | |
202 | /* Used when we know struct net exists but we | |
203 | * aren't guaranteed a previous reference count | |
204 | * exists. If the reference count is zero this | |
205 | * function fails and returns NULL. | |
206 | */ | |
207 | if (!atomic_inc_not_zero(&net->count)) | |
208 | net = NULL; | |
209 | return net; | |
210 | } | |
211 | ||
5f256bec EB |
212 | static inline void put_net(struct net *net) |
213 | { | |
214 | if (atomic_dec_and_test(&net->count)) | |
215 | __put_net(net); | |
216 | } | |
217 | ||
878628fb YH |
218 | static inline |
219 | int net_eq(const struct net *net1, const struct net *net2) | |
220 | { | |
221 | return net1 == net2; | |
222 | } | |
a685e089 | 223 | |
e67e16ea | 224 | void net_drop_ns(void *); |
a685e089 | 225 | |
d4655795 | 226 | #else |
b9f75f45 | 227 | |
d4655795 PE |
228 | static inline struct net *get_net(struct net *net) |
229 | { | |
230 | return net; | |
231 | } | |
232 | ||
233 | static inline void put_net(struct net *net) | |
234 | { | |
235 | } | |
236 | ||
5d1e4468 DL |
237 | static inline struct net *maybe_get_net(struct net *net) |
238 | { | |
239 | return net; | |
240 | } | |
241 | ||
242 | static inline | |
243 | int net_eq(const struct net *net1, const struct net *net2) | |
244 | { | |
245 | return 1; | |
246 | } | |
a685e089 AV |
247 | |
248 | #define net_drop_ns NULL | |
5d1e4468 DL |
249 | #endif |
250 | ||
251 | ||
0c5c9fb5 | 252 | typedef struct { |
8f424b5f | 253 | #ifdef CONFIG_NET_NS |
0c5c9fb5 EB |
254 | struct net *net; |
255 | #endif | |
256 | } possible_net_t; | |
8f424b5f | 257 | |
0c5c9fb5 | 258 | static inline void write_pnet(possible_net_t *pnet, struct net *net) |
8f424b5f | 259 | { |
0c5c9fb5 EB |
260 | #ifdef CONFIG_NET_NS |
261 | pnet->net = net; | |
262 | #endif | |
8f424b5f ED |
263 | } |
264 | ||
0c5c9fb5 | 265 | static inline struct net *read_pnet(const possible_net_t *pnet) |
8f424b5f | 266 | { |
0c5c9fb5 EB |
267 | #ifdef CONFIG_NET_NS |
268 | return pnet->net; | |
8f424b5f | 269 | #else |
0c5c9fb5 | 270 | return &init_net; |
8f424b5f | 271 | #endif |
0c5c9fb5 | 272 | } |
5d1e4468 | 273 | |
5f256bec EB |
274 | #define for_each_net(VAR) \ |
275 | list_for_each_entry(VAR, &net_namespace_list, list) | |
276 | ||
11a28d37 JB |
277 | #define for_each_net_rcu(VAR) \ |
278 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
279 | ||
4665079c PE |
280 | #ifdef CONFIG_NET_NS |
281 | #define __net_init | |
282 | #define __net_exit | |
022cbae6 | 283 | #define __net_initdata |
04a6f82c | 284 | #define __net_initconst |
4665079c PE |
285 | #else |
286 | #define __net_init __init | |
bd721ea7 | 287 | #define __net_exit __ref |
022cbae6 | 288 | #define __net_initdata __initdata |
04a6f82c | 289 | #define __net_initconst __initconst |
4665079c | 290 | #endif |
5f256bec | 291 | |
7a0877d4 | 292 | int peernet2id_alloc(struct net *net, struct net *peer); |
59324cf3 ND |
293 | int peernet2id(struct net *net, struct net *peer); |
294 | bool peernet_has_id(struct net *net, struct net *peer); | |
0c7aecd4 ND |
295 | struct net *get_net_ns_by_id(struct net *net, int id); |
296 | ||
5f256bec EB |
297 | struct pernet_operations { |
298 | struct list_head list; | |
299 | int (*init)(struct net *net); | |
300 | void (*exit)(struct net *net); | |
72ad937a | 301 | void (*exit_batch)(struct list_head *net_exit_list); |
c7d03a00 | 302 | unsigned int *id; |
f875bae0 | 303 | size_t size; |
5f256bec EB |
304 | }; |
305 | ||
17edde52 EB |
306 | /* |
307 | * Use these carefully. If you implement a network device and it | |
308 | * needs per network namespace operations use device pernet operations, | |
309 | * otherwise use pernet subsys operations. | |
310 | * | |
4edf547b JB |
311 | * Network interfaces need to be removed from a dying netns _before_ |
312 | * subsys notifiers can be called, as most of the network code cleanup | |
313 | * (which is done from subsys notifiers) runs with the assumption that | |
314 | * dev_remove_pack has been called so no new packets will arrive during | |
315 | * and after the cleanup functions have been called. dev_remove_pack | |
316 | * is not per namespace so instead the guarantee of no more packets | |
317 | * arriving in a network namespace is provided by ensuring that all | |
318 | * network devices and all sockets have left the network namespace | |
319 | * before the cleanup methods are called. | |
17edde52 EB |
320 | * |
321 | * For the longest time the ipv4 icmp code was registered as a pernet | |
322 | * device which caused kernel oops, and panics during network | |
323 | * namespace cleanup. So please don't get this wrong. | |
324 | */ | |
e67e16ea JP |
325 | int register_pernet_subsys(struct pernet_operations *); |
326 | void unregister_pernet_subsys(struct pernet_operations *); | |
327 | int register_pernet_device(struct pernet_operations *); | |
328 | void unregister_pernet_device(struct pernet_operations *); | |
f875bae0 | 329 | |
95bdfccb EB |
330 | struct ctl_table; |
331 | struct ctl_table_header; | |
d62c612e | 332 | |
2ca794e5 | 333 | #ifdef CONFIG_SYSCTL |
e67e16ea JP |
334 | int net_sysctl_init(void); |
335 | struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, | |
336 | struct ctl_table *table); | |
337 | void unregister_net_sysctl_table(struct ctl_table_header *header); | |
48c74958 EB |
338 | #else |
339 | static inline int net_sysctl_init(void) { return 0; } | |
340 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, | |
341 | const char *path, struct ctl_table *table) | |
342 | { | |
343 | return NULL; | |
344 | } | |
345 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) | |
346 | { | |
347 | } | |
348 | #endif | |
349 | ||
ca4c3fc2 | 350 | static inline int rt_genid_ipv4(struct net *net) |
b42664f8 | 351 | { |
ca4c3fc2 | 352 | return atomic_read(&net->ipv4.rt_genid); |
b42664f8 ND |
353 | } |
354 | ||
ca4c3fc2 | 355 | static inline void rt_genid_bump_ipv4(struct net *net) |
b42664f8 | 356 | { |
ca4c3fc2 | 357 | atomic_inc(&net->ipv4.rt_genid); |
358 | } | |
359 | ||
705f1c86 | 360 | extern void (*__fib6_flush_trees)(struct net *net); |
ca4c3fc2 | 361 | static inline void rt_genid_bump_ipv6(struct net *net) |
362 | { | |
705f1c86 HFS |
363 | if (__fib6_flush_trees) |
364 | __fib6_flush_trees(net); | |
ca4c3fc2 | 365 | } |
ca4c3fc2 | 366 | |
599018a7 LR |
367 | #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
368 | static inline struct netns_ieee802154_lowpan * | |
369 | net_ieee802154_lowpan(struct net *net) | |
370 | { | |
371 | return &net->ieee802154_lowpan; | |
372 | } | |
599018a7 LR |
373 | #endif |
374 | ||
ca4c3fc2 | 375 | /* For callers who don't really care about whether it's IPv4 or IPv6 */ |
376 | static inline void rt_genid_bump_all(struct net *net) | |
377 | { | |
378 | rt_genid_bump_ipv4(net); | |
379 | rt_genid_bump_ipv6(net); | |
b42664f8 | 380 | } |
95bdfccb | 381 | |
5aad1de5 TT |
382 | static inline int fnhe_genid(struct net *net) |
383 | { | |
384 | return atomic_read(&net->fnhe_genid); | |
385 | } | |
386 | ||
387 | static inline void fnhe_genid_bump(struct net *net) | |
388 | { | |
389 | atomic_inc(&net->fnhe_genid); | |
390 | } | |
391 | ||
5f256bec | 392 | #endif /* __NET_NET_NAMESPACE_H */ |