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> |
67019cc9 | 18 | #include <net/netns/dccp.h> |
8d870052 | 19 | #include <net/netns/x_tables.h> |
dfdb8d79 AD |
20 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
21 | #include <net/netns/conntrack.h> | |
22 | #endif | |
d62ddc21 | 23 | #include <net/netns/xfrm.h> |
a0a53c8b | 24 | |
457c4cbc | 25 | struct proc_dir_entry; |
2774c7ab | 26 | struct net_device; |
97c53cac | 27 | struct sock; |
1597fbc0 | 28 | struct ctl_table_header; |
dec827d1 | 29 | struct net_generic; |
134e6375 | 30 | struct sock; |
2553d064 | 31 | struct netns_ipvs; |
1597fbc0 | 32 | |
7c28bd0b ED |
33 | |
34 | #define NETDEV_HASHBITS 8 | |
35 | #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS) | |
36 | ||
5f256bec | 37 | struct net { |
a685e089 AV |
38 | atomic_t passive; /* To decided when the network |
39 | * namespace should be freed. | |
40 | */ | |
5f256bec | 41 | atomic_t count; /* To decided when the network |
a685e089 | 42 | * namespace should be shut down. |
5f256bec | 43 | */ |
5d1e4468 | 44 | #ifdef NETNS_REFCNT_DEBUG |
5f256bec EB |
45 | atomic_t use_count; /* To track references we |
46 | * destroy on demand | |
47 | */ | |
5d1e4468 | 48 | #endif |
8e602ce2 ED |
49 | spinlock_t rules_mod_lock; |
50 | ||
5f256bec | 51 | struct list_head list; /* list of network namespaces */ |
2b035b39 | 52 | struct list_head cleanup_list; /* namespaces on death row */ |
72ad937a | 53 | struct list_head exit_list; /* Use only net_mutex */ |
457c4cbc EB |
54 | |
55 | struct proc_dir_entry *proc_net; | |
56 | struct proc_dir_entry *proc_net_stat; | |
881d966b | 57 | |
73455092 AV |
58 | #ifdef CONFIG_SYSCTL |
59 | struct ctl_table_set sysctls; | |
60 | #endif | |
95bdfccb | 61 | |
8e602ce2 ED |
62 | struct sock *rtnl; /* rtnetlink socket */ |
63 | struct sock *genl_sock; | |
2774c7ab | 64 | |
881d966b EB |
65 | struct list_head dev_base_head; |
66 | struct hlist_head *dev_name_head; | |
67 | struct hlist_head *dev_index_head; | |
4e985ada | 68 | unsigned int dev_base_seq; /* protected by rtnl_mutex */ |
97c53cac | 69 | |
5fd30ee7 DL |
70 | /* core fib_rules */ |
71 | struct list_head rules_ops; | |
5fd30ee7 | 72 | |
d12d01d6 | 73 | |
8e602ce2 | 74 | struct net_device *loopback_dev; /* The loopback */ |
8efa6e93 | 75 | struct netns_core core; |
852566f5 | 76 | struct netns_mib mib; |
2aaef4e4 | 77 | struct netns_packet packet; |
a0a53c8b | 78 | struct netns_unix unx; |
8afd351c | 79 | struct netns_ipv4 ipv4; |
dfd56b8b | 80 | #if IS_ENABLED(CONFIG_IPV6) |
b0f159db DL |
81 | struct netns_ipv6 ipv6; |
82 | #endif | |
67019cc9 PE |
83 | #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE) |
84 | struct netns_dccp dccp; | |
85 | #endif | |
8d870052 AD |
86 | #ifdef CONFIG_NETFILTER |
87 | struct netns_xt xt; | |
dfdb8d79 AD |
88 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
89 | struct netns_ct ct; | |
90 | #endif | |
cd8c20b6 AD |
91 | struct sock *nfnl; |
92 | struct sock *nfnl_stash; | |
d62ddc21 | 93 | #endif |
3d23e349 | 94 | #ifdef CONFIG_WEXT_CORE |
b333b3d2 | 95 | struct sk_buff_head wext_nlevents; |
8d870052 | 96 | #endif |
1c87733d | 97 | struct net_generic __rcu *gen; |
8e602ce2 ED |
98 | |
99 | /* Note : following structs are cache line aligned */ | |
100 | #ifdef CONFIG_XFRM | |
101 | struct netns_xfrm xfrm; | |
102 | #endif | |
61b1ab45 | 103 | struct netns_ipvs *ipvs; |
5f256bec EB |
104 | }; |
105 | ||
225c0a01 | 106 | |
c0f39322 DL |
107 | #include <linux/seq_file_net.h> |
108 | ||
4fabcd71 | 109 | /* Init's network namespace */ |
5f256bec | 110 | extern struct net init_net; |
a4aa834a DL |
111 | |
112 | #ifdef CONFIG_NET | |
9dd776b6 | 113 | extern struct net *copy_net_ns(unsigned long flags, struct net *net_ns); |
225c0a01 DL |
114 | |
115 | #else /* CONFIG_NET */ | |
9dd776b6 EB |
116 | static inline struct net *copy_net_ns(unsigned long flags, struct net *net_ns) |
117 | { | |
118 | /* There is nothing to copy so this is a noop */ | |
119 | return net_ns; | |
120 | } | |
225c0a01 DL |
121 | #endif /* CONFIG_NET */ |
122 | ||
123 | ||
124 | extern struct list_head net_namespace_list; | |
9dd776b6 | 125 | |
30ffee84 | 126 | extern struct net *get_net_ns_by_pid(pid_t pid); |
f0630529 | 127 | extern struct net *get_net_ns_by_fd(int pid); |
30ffee84 | 128 | |
d4655795 | 129 | #ifdef CONFIG_NET_NS |
5f256bec EB |
130 | extern void __put_net(struct net *net); |
131 | ||
132 | static inline struct net *get_net(struct net *net) | |
133 | { | |
134 | atomic_inc(&net->count); | |
135 | return net; | |
136 | } | |
137 | ||
077130c0 EB |
138 | static inline struct net *maybe_get_net(struct net *net) |
139 | { | |
140 | /* Used when we know struct net exists but we | |
141 | * aren't guaranteed a previous reference count | |
142 | * exists. If the reference count is zero this | |
143 | * function fails and returns NULL. | |
144 | */ | |
145 | if (!atomic_inc_not_zero(&net->count)) | |
146 | net = NULL; | |
147 | return net; | |
148 | } | |
149 | ||
5f256bec EB |
150 | static inline void put_net(struct net *net) |
151 | { | |
152 | if (atomic_dec_and_test(&net->count)) | |
153 | __put_net(net); | |
154 | } | |
155 | ||
878628fb YH |
156 | static inline |
157 | int net_eq(const struct net *net1, const struct net *net2) | |
158 | { | |
159 | return net1 == net2; | |
160 | } | |
a685e089 AV |
161 | |
162 | extern void net_drop_ns(void *); | |
163 | ||
d4655795 | 164 | #else |
b9f75f45 | 165 | |
d4655795 PE |
166 | static inline struct net *get_net(struct net *net) |
167 | { | |
168 | return net; | |
169 | } | |
170 | ||
171 | static inline void put_net(struct net *net) | |
172 | { | |
173 | } | |
174 | ||
5d1e4468 DL |
175 | static inline struct net *maybe_get_net(struct net *net) |
176 | { | |
177 | return net; | |
178 | } | |
179 | ||
180 | static inline | |
181 | int net_eq(const struct net *net1, const struct net *net2) | |
182 | { | |
183 | return 1; | |
184 | } | |
a685e089 AV |
185 | |
186 | #define net_drop_ns NULL | |
5d1e4468 DL |
187 | #endif |
188 | ||
189 | ||
190 | #ifdef NETNS_REFCNT_DEBUG | |
d4655795 PE |
191 | static inline struct net *hold_net(struct net *net) |
192 | { | |
5d1e4468 DL |
193 | if (net) |
194 | atomic_inc(&net->use_count); | |
d4655795 PE |
195 | return net; |
196 | } | |
197 | ||
198 | static inline void release_net(struct net *net) | |
199 | { | |
5d1e4468 DL |
200 | if (net) |
201 | atomic_dec(&net->use_count); | |
d4655795 | 202 | } |
5d1e4468 DL |
203 | #else |
204 | static inline struct net *hold_net(struct net *net) | |
d4655795 PE |
205 | { |
206 | return net; | |
207 | } | |
878628fb | 208 | |
5d1e4468 | 209 | static inline void release_net(struct net *net) |
878628fb | 210 | { |
878628fb | 211 | } |
d4655795 | 212 | #endif |
5f256bec | 213 | |
8f424b5f ED |
214 | #ifdef CONFIG_NET_NS |
215 | ||
216 | static inline void write_pnet(struct net **pnet, struct net *net) | |
217 | { | |
218 | *pnet = net; | |
219 | } | |
220 | ||
221 | static inline struct net *read_pnet(struct net * const *pnet) | |
222 | { | |
223 | return *pnet; | |
224 | } | |
225 | ||
226 | #else | |
227 | ||
228 | #define write_pnet(pnet, net) do { (void)(net);} while (0) | |
229 | #define read_pnet(pnet) (&init_net) | |
230 | ||
231 | #endif | |
5d1e4468 | 232 | |
5f256bec EB |
233 | #define for_each_net(VAR) \ |
234 | list_for_each_entry(VAR, &net_namespace_list, list) | |
235 | ||
11a28d37 JB |
236 | #define for_each_net_rcu(VAR) \ |
237 | list_for_each_entry_rcu(VAR, &net_namespace_list, list) | |
238 | ||
4665079c PE |
239 | #ifdef CONFIG_NET_NS |
240 | #define __net_init | |
241 | #define __net_exit | |
022cbae6 | 242 | #define __net_initdata |
4665079c PE |
243 | #else |
244 | #define __net_init __init | |
245 | #define __net_exit __exit_refok | |
022cbae6 | 246 | #define __net_initdata __initdata |
4665079c | 247 | #endif |
5f256bec EB |
248 | |
249 | struct pernet_operations { | |
250 | struct list_head list; | |
251 | int (*init)(struct net *net); | |
252 | void (*exit)(struct net *net); | |
72ad937a | 253 | void (*exit_batch)(struct list_head *net_exit_list); |
f875bae0 EB |
254 | int *id; |
255 | size_t size; | |
5f256bec EB |
256 | }; |
257 | ||
17edde52 EB |
258 | /* |
259 | * Use these carefully. If you implement a network device and it | |
260 | * needs per network namespace operations use device pernet operations, | |
261 | * otherwise use pernet subsys operations. | |
262 | * | |
4edf547b JB |
263 | * Network interfaces need to be removed from a dying netns _before_ |
264 | * subsys notifiers can be called, as most of the network code cleanup | |
265 | * (which is done from subsys notifiers) runs with the assumption that | |
266 | * dev_remove_pack has been called so no new packets will arrive during | |
267 | * and after the cleanup functions have been called. dev_remove_pack | |
268 | * is not per namespace so instead the guarantee of no more packets | |
269 | * arriving in a network namespace is provided by ensuring that all | |
270 | * network devices and all sockets have left the network namespace | |
271 | * before the cleanup methods are called. | |
17edde52 EB |
272 | * |
273 | * For the longest time the ipv4 icmp code was registered as a pernet | |
274 | * device which caused kernel oops, and panics during network | |
275 | * namespace cleanup. So please don't get this wrong. | |
276 | */ | |
5f256bec EB |
277 | extern int register_pernet_subsys(struct pernet_operations *); |
278 | extern void unregister_pernet_subsys(struct pernet_operations *); | |
279 | extern int register_pernet_device(struct pernet_operations *); | |
280 | extern void unregister_pernet_device(struct pernet_operations *); | |
f875bae0 | 281 | |
95bdfccb EB |
282 | struct ctl_table; |
283 | struct ctl_table_header; | |
d62c612e | 284 | |
2ca794e5 EB |
285 | #ifdef CONFIG_SYSCTL |
286 | extern int net_sysctl_init(void); | |
ab41a2ca EB |
287 | extern struct ctl_table_header *register_net_sysctl(struct net *net, |
288 | const char *path, struct ctl_table *table); | |
95bdfccb | 289 | extern void unregister_net_sysctl_table(struct ctl_table_header *header); |
48c74958 EB |
290 | #else |
291 | static inline int net_sysctl_init(void) { return 0; } | |
292 | static inline struct ctl_table_header *register_net_sysctl(struct net *net, | |
293 | const char *path, struct ctl_table *table) | |
294 | { | |
295 | return NULL; | |
296 | } | |
297 | static inline void unregister_net_sysctl_table(struct ctl_table_header *header) | |
298 | { | |
299 | } | |
300 | #endif | |
301 | ||
95bdfccb | 302 | |
5f256bec | 303 | #endif /* __NET_NET_NAMESPACE_H */ |