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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
5f256bec EB |
2 | /* |
3 | * Operations on the network namespace | |
4 | */ | |
5 | #ifndef __NET_NET_NAMESPACE_H | |
6 | #define __NET_NET_NAMESPACE_H | |
7 | ||
60063497 | 8 | #include <linux/atomic.h> |
c122e14d | 9 | #include <linux/refcount.h> |
5f256bec EB |
10 | #include <linux/workqueue.h> |
11 | #include <linux/list.h> | |
bee95250 | 12 | #include <linux/sysctl.h> |
de645b47 | 13 | #include <linux/uidgid.h> |
5f256bec | 14 | |
6a662719 | 15 | #include <net/flow.h> |
8efa6e93 | 16 | #include <net/netns/core.h> |
852566f5 | 17 | #include <net/netns/mib.h> |
a0a53c8b | 18 | #include <net/netns/unix.h> |
2aaef4e4 | 19 | #include <net/netns/packet.h> |
8afd351c | 20 | #include <net/netns/ipv4.h> |
b0f159db | 21 | #include <net/netns/ipv6.h> |
633fc86f | 22 | #include <net/netns/ieee802154_6lowpan.h> |
4db67e80 | 23 | #include <net/netns/sctp.h> |
67019cc9 | 24 | #include <net/netns/dccp.h> |
f3c1a44a | 25 | #include <net/netns/netfilter.h> |
8d870052 | 26 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
27 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
28 | #include <net/netns/conntrack.h> | |
29 | #endif | |
99633ab2 | 30 | #include <net/netns/nftables.h> |
d62ddc21 | 31 | #include <net/netns/xfrm.h> |
0189197f | 32 | #include <net/netns/mpls.h> |
8e8cda6d | 33 | #include <net/netns/can.h> |
435d5f4b | 34 | #include <linux/ns_common.h> |
04c52dec PNA |
35 | #include <linux/idr.h> |
36 | #include <linux/skbuff.h> | |
a0a53c8b | 37 | |
038e7332 | 38 | struct user_namespace; |
457c4cbc | 39 | struct proc_dir_entry; |
2774c7ab | 40 | struct net_device; |
97c53cac | 41 | struct sock; |
1597fbc0 | 42 | struct ctl_table_header; |
dec827d1 | 43 | struct net_generic; |
134e6375 | 44 | struct sock; |
2553d064 | 45 | struct netns_ipvs; |
1597fbc0 | 46 | |
7c28bd0b ED |
47 | |
48 | #define NETDEV_HASHBITS 8 | |
49 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
50 | ||
5f256bec | 51 | struct net { |
c122e14d | 52 | refcount_t passive; /* To decided when the network |
a685e089 AV |
53 | * namespace should be freed. |
54 | */ | |
5f256bec | 55 | atomic_t count; /* To decided when the network |
a685e089 | 56 | * namespace should be shut down. |
5f256bec | 57 | */ |
8e602ce2 ED |
58 | spinlock_t rules_mod_lock; |
59 | ||
33cf7c90 ED |
60 | atomic64_t cookie_gen; |
61 | ||
5f256bec | 62 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 63 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 64 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc | 65 | |
038e7332 | 66 | struct user_namespace *user_ns; /* Owning user namespace */ |
70328660 | 67 | struct ucounts *ucounts; |
de133464 | 68 | spinlock_t nsid_lock; |
0c7aecd4 | 69 | struct idr netns_ids; |
038e7332 | 70 | |
435d5f4b | 71 | struct ns_common ns; |
98f842e6 | 72 | |
457c4cbc EB |
73 | struct proc_dir_entry *proc_net; |
74 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 75 | |
73455092 AV |
76 | #ifdef CONFIG_SYSCTL |
77 | struct ctl_table_set sysctls; | |
78 | #endif | |
95bdfccb | 79 | |
8e602ce2 ED |
80 | struct sock *rtnl; /* rtnetlink socket */ |
81 | struct sock *genl_sock; | |
2774c7ab | 82 | |
881d966b EB |
83 | struct list_head dev_base_head; |
84 | struct hlist_head *dev_name_head; | |
85 | struct hlist_head *dev_index_head; | |
4e985ada | 86 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
aa79e66e | 87 | int ifindex; |
50624c93 | 88 | unsigned int dev_unreg_count; |
97c53cac | 89 | |
5fd30ee7 DL |
90 | /* core fib_rules */ |
91 | struct list_head rules_ops; | |
5fd30ee7 | 92 | |
04b1d4e5 | 93 | struct list_head fib_notifier_ops; /* protected by net_mutex */ |
d12d01d6 | 94 | |
8e602ce2 | 95 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 96 | struct netns_core core; |
852566f5 | 97 | struct netns_mib mib; |
2aaef4e4 | 98 | struct netns_packet packet; |
a0a53c8b | 99 | struct netns_unix unx; |
8afd351c | 100 | struct netns_ipv4 ipv4; |
dfd56b8b | 101 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
102 | struct netns_ipv6 ipv6; |
103 | #endif | |
633fc86f AA |
104 | #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
105 | struct netns_ieee802154_lowpan ieee802154_lowpan; | |
106 | #endif | |
4db67e80 EB |
107 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
108 | struct netns_sctp sctp; | |
109 | #endif | |
67019cc9 PE |
110 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
111 | struct netns_dccp dccp; | |
112 | #endif | |
8d870052 | 113 | #ifdef CONFIG_NETFILTER |
f3c1a44a | 114 | struct netns_nf nf; |
8d870052 | 115 | struct netns_xt xt; |
dfdb8d79 AD |
116 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
117 | struct netns_ct ct; | |
c038a767 | 118 | #endif |
99633ab2 PNA |
119 | #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE) |
120 | struct netns_nftables nft; | |
121 | #endif | |
c038a767 AW |
122 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) |
123 | struct netns_nf_frag nf_frag; | |
dfdb8d79 | 124 | #endif |
cd8c20b6 AD |
125 | struct sock *nfnl; |
126 | struct sock *nfnl_stash; | |
3499abb2 AS |
127 | #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT) |
128 | struct list_head nfnl_acct_list; | |
129 | #endif | |
19576c94 PN |
130 | #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT) |
131 | struct list_head nfct_timeout_list; | |
132 | #endif | |
d62ddc21 | 133 | #endif |
3d23e349 | 134 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 135 | struct sk_buff_head wext_nlevents; |
8d870052 | 136 | #endif |
1c87733d | 137 | struct net_generic __rcu *gen; |
8e602ce2 ED |
138 | |
139 | /* Note : following structs are cache line aligned */ | |
140 | #ifdef CONFIG_XFRM | |
141 | struct netns_xfrm xfrm; | |
142 | #endif | |
8b4d14d8 | 143 | #if IS_ENABLED(CONFIG_IP_VS) |
61b1ab45 | 144 | struct netns_ipvs *ipvs; |
0189197f EB |
145 | #endif |
146 | #if IS_ENABLED(CONFIG_MPLS) | |
147 | struct netns_mpls mpls; | |
8e8cda6d MK |
148 | #endif |
149 | #if IS_ENABLED(CONFIG_CAN) | |
150 | struct netns_can can; | |
8b4d14d8 | 151 | #endif |
51d7cccf | 152 | struct sock *diag_nlsk; |
5aad1de5 | 153 | atomic_t fnhe_genid; |
3859a271 | 154 | } __randomize_layout; |
5f256bec | 155 | |
c0f39322 DL |
156 | #include <linux/seq_file_net.h> |
157 | ||
4fabcd71 | 158 | /* Init's network namespace */ |
5f256bec | 159 | extern struct net init_net; |
a4aa834a | 160 | |
d727abcb | 161 | #ifdef CONFIG_NET_NS |
e67e16ea JP |
162 | struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns, |
163 | struct net *old_net); | |
225c0a01 | 164 | |
de645b47 TH |
165 | void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid); |
166 | ||
7866cc57 | 167 | void net_ns_barrier(void); |
d727abcb EB |
168 | #else /* CONFIG_NET_NS */ |
169 | #include <linux/sched.h> | |
170 | #include <linux/nsproxy.h> | |
038e7332 EB |
171 | static inline struct net *copy_net_ns(unsigned long flags, |
172 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 173 | { |
d727abcb EB |
174 | if (flags & CLONE_NEWNET) |
175 | return ERR_PTR(-EINVAL); | |
176 | return old_net; | |
9dd776b6 | 177 | } |
7866cc57 | 178 | |
de645b47 TH |
179 | static inline void net_ns_get_ownership(const struct net *net, |
180 | kuid_t *uid, kgid_t *gid) | |
181 | { | |
182 | *uid = GLOBAL_ROOT_UID; | |
183 | *gid = GLOBAL_ROOT_GID; | |
184 | } | |
185 | ||
7866cc57 | 186 | static inline void net_ns_barrier(void) {} |
d727abcb | 187 | #endif /* CONFIG_NET_NS */ |
225c0a01 DL |
188 | |
189 | ||
190 | extern struct list_head net_namespace_list; | |
9dd776b6 | 191 | |
e67e16ea | 192 | struct net *get_net_ns_by_pid(pid_t pid); |
0f5258cd | 193 | struct net *get_net_ns_by_fd(int fd); |
30ffee84 | 194 | |
535d3ae9 RK |
195 | #ifdef CONFIG_SYSCTL |
196 | void ipx_register_sysctl(void); | |
197 | void ipx_unregister_sysctl(void); | |
198 | #else | |
199 | #define ipx_register_sysctl() | |
200 | #define ipx_unregister_sysctl() | |
201 | #endif | |
202 | ||
d4655795 | 203 | #ifdef CONFIG_NET_NS |
e67e16ea | 204 | void __put_net(struct net *net); |
5f256bec EB |
205 | |
206 | static inline struct net *get_net(struct net *net) | |
207 | { | |
208 | atomic_inc(&net->count); | |
209 | return net; | |
210 | } | |
211 | ||
077130c0 EB |
212 | static inline struct net *maybe_get_net(struct net *net) |
213 | { | |
214 | /* Used when we know struct net exists but we | |
215 | * aren't guaranteed a previous reference count | |
216 | * exists. If the reference count is zero this | |
217 | * function fails and returns NULL. | |
218 | */ | |
219 | if (!atomic_inc_not_zero(&net->count)) | |
220 | net = NULL; | |
221 | return net; | |
222 | } | |
223 | ||
5f256bec EB |
224 | static inline void put_net(struct net *net) |
225 | { | |
226 | if (atomic_dec_and_test(&net->count)) | |
227 | __put_net(net); | |
228 | } | |
229 | ||
878628fb YH |
230 | static inline |
231 | int net_eq(const struct net *net1, const struct net *net2) | |
232 | { | |
233 | return net1 == net2; | |
234 | } | |
a685e089 | 235 | |
4ee806d5 DS |
236 | static inline int check_net(const struct net *net) |
237 | { | |
238 | return atomic_read(&net->count) != 0; | |
239 | } | |
240 | ||
e67e16ea | 241 | void net_drop_ns(void *); |
a685e089 | 242 | |
d4655795 | 243 | #else |
b9f75f45 | 244 | |
d4655795 PE |
245 | static inline struct net *get_net(struct net *net) |
246 | { | |
247 | return net; | |
248 | } | |
249 | ||
250 | static inline void put_net(struct net *net) | |
251 | { | |
252 | } | |
253 | ||
5d1e4468 DL |
254 | static inline struct net *maybe_get_net(struct net *net) |
255 | { | |
256 | return net; | |
257 | } | |
258 | ||
259 | static inline | |
260 | int net_eq(const struct net *net1, const struct net *net2) | |
261 | { | |
262 | return 1; | |
263 | } | |
a685e089 | 264 | |
4ee806d5 DS |
265 | static inline int check_net(const struct net *net) |
266 | { | |
267 | return 1; | |
268 | } | |
269 | ||
a685e089 | 270 | #define net_drop_ns NULL |
5d1e4468 DL |
271 | #endif |
272 | ||
273 | ||
0c5c9fb5 | 274 | typedef struct { |
8f424b5f | 275 | #ifdef CONFIG_NET_NS |
0c5c9fb5 EB |
276 | struct net *net; |
277 | #endif | |
278 | } possible_net_t; | |
8f424b5f | 279 | |
0c5c9fb5 | 280 | static inline void write_pnet(possible_net_t *pnet, struct net *net) |
8f424b5f | 281 | { |
0c5c9fb5 EB |
282 | #ifdef CONFIG_NET_NS |
283 | pnet->net = net; | |
284 | #endif | |
8f424b5f ED |
285 | } |
286 | ||
0c5c9fb5 | 287 | static inline struct net *read_pnet(const possible_net_t *pnet) |
8f424b5f | 288 | { |
0c5c9fb5 EB |
289 | #ifdef CONFIG_NET_NS |
290 | return pnet->net; | |
8f424b5f | 291 | #else |
0c5c9fb5 | 292 | return &init_net; |
8f424b5f | 293 | #endif |
0c5c9fb5 | 294 | } |
5d1e4468 | 295 | |
5f256bec EB |
296 | #define for_each_net(VAR) \ |
297 | list_for_each_entry(VAR, &net_namespace_list, list) | |
298 | ||
11a28d37 JB |
299 | #define for_each_net_rcu(VAR) \ |
300 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
301 | ||
4665079c PE |
302 | #ifdef CONFIG_NET_NS |
303 | #define __net_init | |
304 | #define __net_exit | |
022cbae6 | 305 | #define __net_initdata |
04a6f82c | 306 | #define __net_initconst |
4665079c PE |
307 | #else |
308 | #define __net_init __init | |
bd721ea7 | 309 | #define __net_exit __ref |
022cbae6 | 310 | #define __net_initdata __initdata |
04a6f82c | 311 | #define __net_initconst __initconst |
4665079c | 312 | #endif |
5f256bec | 313 | |
7a0877d4 | 314 | int peernet2id_alloc(struct net *net, struct net *peer); |
59324cf3 ND |
315 | int peernet2id(struct net *net, struct net *peer); |
316 | bool peernet_has_id(struct net *net, struct net *peer); | |
0c7aecd4 ND |
317 | struct net *get_net_ns_by_id(struct net *net, int id); |
318 | ||
5f256bec EB |
319 | struct pernet_operations { |
320 | struct list_head list; | |
321 | int (*init)(struct net *net); | |
322 | void (*exit)(struct net *net); | |
72ad937a | 323 | void (*exit_batch)(struct list_head *net_exit_list); |
c7d03a00 | 324 | unsigned int *id; |
f875bae0 | 325 | size_t size; |
5f256bec EB |
326 | }; |
327 | ||
17edde52 EB |
328 | /* |
329 | * Use these carefully. If you implement a network device and it | |
330 | * needs per network namespace operations use device pernet operations, | |
331 | * otherwise use pernet subsys operations. | |
332 | * | |
4edf547b JB |
333 | * Network interfaces need to be removed from a dying netns _before_ |
334 | * subsys notifiers can be called, as most of the network code cleanup | |
335 | * (which is done from subsys notifiers) runs with the assumption that | |
336 | * dev_remove_pack has been called so no new packets will arrive during | |
337 | * and after the cleanup functions have been called. dev_remove_pack | |
338 | * is not per namespace so instead the guarantee of no more packets | |
339 | * arriving in a network namespace is provided by ensuring that all | |
340 | * network devices and all sockets have left the network namespace | |
341 | * before the cleanup methods are called. | |
17edde52 EB |
342 | * |
343 | * For the longest time the ipv4 icmp code was registered as a pernet | |
344 | * device which caused kernel oops, and panics during network | |
345 | * namespace cleanup. So please don't get this wrong. | |
346 | */ | |
e67e16ea JP |
347 | int register_pernet_subsys(struct pernet_operations *); |
348 | void unregister_pernet_subsys(struct pernet_operations *); | |
349 | int register_pernet_device(struct pernet_operations *); | |
350 | void unregister_pernet_device(struct pernet_operations *); | |
f875bae0 | 351 | |
95bdfccb EB |
352 | struct ctl_table; |
353 | struct ctl_table_header; | |
d62c612e | 354 | |
2ca794e5 | 355 | #ifdef CONFIG_SYSCTL |
e67e16ea JP |
356 | int net_sysctl_init(void); |
357 | struct ctl_table_header *register_net_sysctl(struct net *net, const char *path, | |
358 | struct ctl_table *table); | |
359 | void unregister_net_sysctl_table(struct ctl_table_header *header); | |
48c74958 EB |
360 | #else |
361 | static inline int net_sysctl_init(void) { return 0; } | |
362 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, | |
363 | const char *path, struct ctl_table *table) | |
364 | { | |
365 | return NULL; | |
366 | } | |
367 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) | |
368 | { | |
369 | } | |
370 | #endif | |
371 | ||
ca4c3fc2 | 372 | static inline int rt_genid_ipv4(struct net *net) |
b42664f8 | 373 | { |
ca4c3fc2 | 374 | return atomic_read(&net->ipv4.rt_genid); |
b42664f8 ND |
375 | } |
376 | ||
ca4c3fc2 | 377 | static inline void rt_genid_bump_ipv4(struct net *net) |
b42664f8 | 378 | { |
ca4c3fc2 | 379 | atomic_inc(&net->ipv4.rt_genid); |
380 | } | |
381 | ||
705f1c86 | 382 | extern void (*__fib6_flush_trees)(struct net *net); |
ca4c3fc2 | 383 | static inline void rt_genid_bump_ipv6(struct net *net) |
384 | { | |
705f1c86 HFS |
385 | if (__fib6_flush_trees) |
386 | __fib6_flush_trees(net); | |
ca4c3fc2 | 387 | } |
ca4c3fc2 | 388 | |
599018a7 LR |
389 | #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN) |
390 | static inline struct netns_ieee802154_lowpan * | |
391 | net_ieee802154_lowpan(struct net *net) | |
392 | { | |
393 | return &net->ieee802154_lowpan; | |
394 | } | |
599018a7 LR |
395 | #endif |
396 | ||
ca4c3fc2 | 397 | /* For callers who don't really care about whether it's IPv4 or IPv6 */ |
398 | static inline void rt_genid_bump_all(struct net *net) | |
399 | { | |
400 | rt_genid_bump_ipv4(net); | |
401 | rt_genid_bump_ipv6(net); | |
b42664f8 | 402 | } |
95bdfccb | 403 | |
5aad1de5 TT |
404 | static inline int fnhe_genid(struct net *net) |
405 | { | |
406 | return atomic_read(&net->fnhe_genid); | |
407 | } | |
408 | ||
409 | static inline void fnhe_genid_bump(struct net *net) | |
410 | { | |
411 | atomic_inc(&net->fnhe_genid); | |
412 | } | |
413 | ||
5f256bec | 414 | #endif /* __NET_NET_NAMESPACE_H */ |