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> |
8d870052 | 20 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
21 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
22 | #include <net/netns/conntrack.h> | |
23 | #endif | |
d62ddc21 | 24 | #include <net/netns/xfrm.h> |
a0a53c8b | 25 | |
038e7332 | 26 | struct user_namespace; |
457c4cbc | 27 | struct proc_dir_entry; |
2774c7ab | 28 | struct net_device; |
97c53cac | 29 | struct sock; |
1597fbc0 | 30 | struct ctl_table_header; |
dec827d1 | 31 | struct net_generic; |
134e6375 | 32 | struct sock; |
2553d064 | 33 | struct netns_ipvs; |
1597fbc0 | 34 | |
7c28bd0b ED |
35 | |
36 | #define NETDEV_HASHBITS 8 | |
37 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
38 | ||
5f256bec | 39 | struct net { |
a685e089 AV |
40 | atomic_t passive; /* To decided when the network |
41 | * namespace should be freed. | |
42 | */ | |
5f256bec | 43 | atomic_t count; /* To decided when the network |
a685e089 | 44 | * namespace should be shut down. |
5f256bec | 45 | */ |
5d1e4468 | 46 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
47 | atomic_t use_count; /* To track references we |
48 | * destroy on demand | |
49 | */ | |
5d1e4468 | 50 | #endif |
8e602ce2 ED |
51 | spinlock_t rules_mod_lock; |
52 | ||
5f256bec | 53 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 54 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 55 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc | 56 | |
038e7332 EB |
57 | struct user_namespace *user_ns; /* Owning user namespace */ |
58 | ||
98f842e6 EB |
59 | unsigned int proc_inum; |
60 | ||
457c4cbc EB |
61 | struct proc_dir_entry *proc_net; |
62 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 63 | |
73455092 AV |
64 | #ifdef CONFIG_SYSCTL |
65 | struct ctl_table_set sysctls; | |
66 | #endif | |
95bdfccb | 67 | |
8e602ce2 ED |
68 | struct sock *rtnl; /* rtnetlink socket */ |
69 | struct sock *genl_sock; | |
2774c7ab | 70 | |
881d966b EB |
71 | struct list_head dev_base_head; |
72 | struct hlist_head *dev_name_head; | |
73 | struct hlist_head *dev_index_head; | |
4e985ada | 74 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
aa79e66e | 75 | int ifindex; |
97c53cac | 76 | |
5fd30ee7 DL |
77 | /* core fib_rules */ |
78 | struct list_head rules_ops; | |
5fd30ee7 | 79 | |
d12d01d6 | 80 | |
8e602ce2 | 81 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 82 | struct netns_core core; |
852566f5 | 83 | struct netns_mib mib; |
2aaef4e4 | 84 | struct netns_packet packet; |
a0a53c8b | 85 | struct netns_unix unx; |
8afd351c | 86 | struct netns_ipv4 ipv4; |
dfd56b8b | 87 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
88 | struct netns_ipv6 ipv6; |
89 | #endif | |
4db67e80 EB |
90 | #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE) |
91 | struct netns_sctp sctp; | |
92 | #endif | |
67019cc9 PE |
93 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
94 | struct netns_dccp dccp; | |
95 | #endif | |
8d870052 AD |
96 | #ifdef CONFIG_NETFILTER |
97 | struct netns_xt xt; | |
dfdb8d79 AD |
98 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
99 | struct netns_ct ct; | |
c038a767 AW |
100 | #endif |
101 | #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6) | |
102 | struct netns_nf_frag nf_frag; | |
dfdb8d79 | 103 | #endif |
cd8c20b6 AD |
104 | struct sock *nfnl; |
105 | struct sock *nfnl_stash; | |
d62ddc21 | 106 | #endif |
3d23e349 | 107 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 108 | struct sk_buff_head wext_nlevents; |
8d870052 | 109 | #endif |
1c87733d | 110 | struct net_generic __rcu *gen; |
8e602ce2 ED |
111 | |
112 | /* Note : following structs are cache line aligned */ | |
113 | #ifdef CONFIG_XFRM | |
114 | struct netns_xfrm xfrm; | |
115 | #endif | |
61b1ab45 | 116 | struct netns_ipvs *ipvs; |
51d7cccf | 117 | struct sock *diag_nlsk; |
b42664f8 | 118 | atomic_t rt_genid; |
5f256bec EB |
119 | }; |
120 | ||
1fb9489b PE |
121 | /* |
122 | * ifindex generation is per-net namespace, and loopback is | |
123 | * always the 1st device in ns (see net_dev_init), thus any | |
124 | * loopback device should get ifindex 1 | |
125 | */ | |
126 | ||
127 | #define LOOPBACK_IFINDEX 1 | |
225c0a01 | 128 | |
c0f39322 DL |
129 | #include <linux/seq_file_net.h> |
130 | ||
4fabcd71 | 131 | /* Init's network namespace */ |
5f256bec | 132 | extern struct net init_net; |
a4aa834a | 133 | |
d727abcb | 134 | #ifdef CONFIG_NET_NS |
038e7332 EB |
135 | extern struct net *copy_net_ns(unsigned long flags, |
136 | struct user_namespace *user_ns, struct net *old_net); | |
225c0a01 | 137 | |
d727abcb EB |
138 | #else /* CONFIG_NET_NS */ |
139 | #include <linux/sched.h> | |
140 | #include <linux/nsproxy.h> | |
038e7332 EB |
141 | static inline struct net *copy_net_ns(unsigned long flags, |
142 | struct user_namespace *user_ns, struct net *old_net) | |
9dd776b6 | 143 | { |
d727abcb EB |
144 | if (flags & CLONE_NEWNET) |
145 | return ERR_PTR(-EINVAL); | |
146 | return old_net; | |
9dd776b6 | 147 | } |
d727abcb | 148 | #endif /* CONFIG_NET_NS */ |
225c0a01 DL |
149 | |
150 | ||
151 | extern struct list_head net_namespace_list; | |
9dd776b6 | 152 | |
30ffee84 | 153 | extern struct net *get_net_ns_by_pid(pid_t pid); |
f0630529 | 154 | extern struct net *get_net_ns_by_fd(int pid); |
30ffee84 | 155 | |
d4655795 | 156 | #ifdef CONFIG_NET_NS |
5f256bec EB |
157 | extern void __put_net(struct net *net); |
158 | ||
159 | static inline struct net *get_net(struct net *net) | |
160 | { | |
161 | atomic_inc(&net->count); | |
162 | return net; | |
163 | } | |
164 | ||
077130c0 EB |
165 | static inline struct net *maybe_get_net(struct net *net) |
166 | { | |
167 | /* Used when we know struct net exists but we | |
168 | * aren't guaranteed a previous reference count | |
169 | * exists. If the reference count is zero this | |
170 | * function fails and returns NULL. | |
171 | */ | |
172 | if (!atomic_inc_not_zero(&net->count)) | |
173 | net = NULL; | |
174 | return net; | |
175 | } | |
176 | ||
5f256bec EB |
177 | static inline void put_net(struct net *net) |
178 | { | |
179 | if (atomic_dec_and_test(&net->count)) | |
180 | __put_net(net); | |
181 | } | |
182 | ||
878628fb YH |
183 | static inline |
184 | int net_eq(const struct net *net1, const struct net *net2) | |
185 | { | |
186 | return net1 == net2; | |
187 | } | |
a685e089 AV |
188 | |
189 | extern void net_drop_ns(void *); | |
190 | ||
d4655795 | 191 | #else |
b9f75f45 | 192 | |
d4655795 PE |
193 | static inline struct net *get_net(struct net *net) |
194 | { | |
195 | return net; | |
196 | } | |
197 | ||
198 | static inline void put_net(struct net *net) | |
199 | { | |
200 | } | |
201 | ||
5d1e4468 DL |
202 | static inline struct net *maybe_get_net(struct net *net) |
203 | { | |
204 | return net; | |
205 | } | |
206 | ||
207 | static inline | |
208 | int net_eq(const struct net *net1, const struct net *net2) | |
209 | { | |
210 | return 1; | |
211 | } | |
a685e089 AV |
212 | |
213 | #define net_drop_ns NULL | |
5d1e4468 DL |
214 | #endif |
215 | ||
216 | ||
217 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
218 | static inline struct net *hold_net(struct net *net) |
219 | { | |
5d1e4468 DL |
220 | if (net) |
221 | atomic_inc(&net->use_count); | |
d4655795 PE |
222 | return net; |
223 | } | |
224 | ||
225 | static inline void release_net(struct net *net) | |
226 | { | |
5d1e4468 DL |
227 | if (net) |
228 | atomic_dec(&net->use_count); | |
d4655795 | 229 | } |
5d1e4468 DL |
230 | #else |
231 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
232 | { |
233 | return net; | |
234 | } | |
878628fb | 235 | |
5d1e4468 | 236 | static inline void release_net(struct net *net) |
878628fb | 237 | { |
878628fb | 238 | } |
d4655795 | 239 | #endif |
5f256bec | 240 | |
8f424b5f ED |
241 | #ifdef CONFIG_NET_NS |
242 | ||
243 | static inline void write_pnet(struct net **pnet, struct net *net) | |
244 | { | |
245 | *pnet = net; | |
246 | } | |
247 | ||
248 | static inline struct net *read_pnet(struct net * const *pnet) | |
249 | { | |
250 | return *pnet; | |
251 | } | |
252 | ||
253 | #else | |
254 | ||
255 | #define write_pnet(pnet, net) do { (void)(net);} while (0) | |
256 | #define read_pnet(pnet) (&init_net) | |
257 | ||
258 | #endif | |
5d1e4468 | 259 | |
5f256bec EB |
260 | #define for_each_net(VAR) \ |
261 | list_for_each_entry(VAR, &net_namespace_list, list) | |
262 | ||
11a28d37 JB |
263 | #define for_each_net_rcu(VAR) \ |
264 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
265 | ||
4665079c PE |
266 | #ifdef CONFIG_NET_NS |
267 | #define __net_init | |
268 | #define __net_exit | |
022cbae6 | 269 | #define __net_initdata |
04a6f82c | 270 | #define __net_initconst |
4665079c PE |
271 | #else |
272 | #define __net_init __init | |
273 | #define __net_exit __exit_refok | |
022cbae6 | 274 | #define __net_initdata __initdata |
04a6f82c | 275 | #define __net_initconst __initconst |
4665079c | 276 | #endif |
5f256bec EB |
277 | |
278 | struct pernet_operations { | |
279 | struct list_head list; | |
280 | int (*init)(struct net *net); | |
281 | void (*exit)(struct net *net); | |
72ad937a | 282 | void (*exit_batch)(struct list_head *net_exit_list); |
f875bae0 EB |
283 | int *id; |
284 | size_t size; | |
5f256bec EB |
285 | }; |
286 | ||
17edde52 EB |
287 | /* |
288 | * Use these carefully. If you implement a network device and it | |
289 | * needs per network namespace operations use device pernet operations, | |
290 | * otherwise use pernet subsys operations. | |
291 | * | |
4edf547b JB |
292 | * Network interfaces need to be removed from a dying netns _before_ |
293 | * subsys notifiers can be called, as most of the network code cleanup | |
294 | * (which is done from subsys notifiers) runs with the assumption that | |
295 | * dev_remove_pack has been called so no new packets will arrive during | |
296 | * and after the cleanup functions have been called. dev_remove_pack | |
297 | * is not per namespace so instead the guarantee of no more packets | |
298 | * arriving in a network namespace is provided by ensuring that all | |
299 | * network devices and all sockets have left the network namespace | |
300 | * before the cleanup methods are called. | |
17edde52 EB |
301 | * |
302 | * For the longest time the ipv4 icmp code was registered as a pernet | |
303 | * device which caused kernel oops, and panics during network | |
304 | * namespace cleanup. So please don't get this wrong. | |
305 | */ | |
5f256bec EB |
306 | extern int register_pernet_subsys(struct pernet_operations *); |
307 | extern void unregister_pernet_subsys(struct pernet_operations *); | |
308 | extern int register_pernet_device(struct pernet_operations *); | |
309 | extern void unregister_pernet_device(struct pernet_operations *); | |
f875bae0 | 310 | |
95bdfccb EB |
311 | struct ctl_table; |
312 | struct ctl_table_header; | |
d62c612e | 313 | |
2ca794e5 EB |
314 | #ifdef CONFIG_SYSCTL |
315 | extern int net_sysctl_init(void); | |
ab41a2ca EB |
316 | extern struct ctl_table_header *register_net_sysctl(struct net *net, |
317 | const char *path, struct ctl_table *table); | |
95bdfccb | 318 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
48c74958 EB |
319 | #else |
320 | static inline int net_sysctl_init(void) { return 0; } | |
321 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, | |
322 | const char *path, struct ctl_table *table) | |
323 | { | |
324 | return NULL; | |
325 | } | |
326 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) | |
327 | { | |
328 | } | |
329 | #endif | |
330 | ||
b42664f8 ND |
331 | static inline int rt_genid(struct net *net) |
332 | { | |
333 | return atomic_read(&net->rt_genid); | |
334 | } | |
335 | ||
336 | static inline void rt_genid_bump(struct net *net) | |
337 | { | |
338 | atomic_inc(&net->rt_genid); | |
339 | } | |
95bdfccb | 340 | |
5f256bec | 341 | #endif /* __NET_NET_NAMESPACE_H */ |