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Linux/include/net/net_namespace.h

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  1 /*
  2  * Operations on the network namespace
  3  */
  4 #ifndef __NET_NET_NAMESPACE_H
  5 #define __NET_NET_NAMESPACE_H
  6 
  7 #include <linux/atomic.h>
  8 #include <linux/workqueue.h>
  9 #include <linux/list.h>
 10 #include <linux/sysctl.h>
 11 
 12 #include <net/flow.h>
 13 #include <net/netns/core.h>
 14 #include <net/netns/mib.h>
 15 #include <net/netns/unix.h>
 16 #include <net/netns/packet.h>
 17 #include <net/netns/ipv4.h>
 18 #include <net/netns/ipv6.h>
 19 #include <net/netns/ieee802154_6lowpan.h>
 20 #include <net/netns/sctp.h>
 21 #include <net/netns/dccp.h>
 22 #include <net/netns/netfilter.h>
 23 #include <net/netns/x_tables.h>
 24 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 25 #include <net/netns/conntrack.h>
 26 #endif
 27 #include <net/netns/nftables.h>
 28 #include <net/netns/xfrm.h>
 29 #include <linux/ns_common.h>
 30 
 31 struct user_namespace;
 32 struct proc_dir_entry;
 33 struct net_device;
 34 struct sock;
 35 struct ctl_table_header;
 36 struct net_generic;
 37 struct sock;
 38 struct netns_ipvs;
 39 
 40 
 41 #define NETDEV_HASHBITS    8
 42 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
 43 
 44 struct net {
 45         atomic_t                passive;        /* To decided when the network
 46                                                  * namespace should be freed.
 47                                                  */
 48         atomic_t                count;          /* To decided when the network
 49                                                  *  namespace should be shut down.
 50                                                  */
 51 #ifdef NETNS_REFCNT_DEBUG
 52         atomic_t                use_count;      /* To track references we
 53                                                  * destroy on demand
 54                                                  */
 55 #endif
 56         spinlock_t              rules_mod_lock;
 57 
 58         struct list_head        list;           /* list of network namespaces */
 59         struct list_head        cleanup_list;   /* namespaces on death row */
 60         struct list_head        exit_list;      /* Use only net_mutex */
 61 
 62         struct user_namespace   *user_ns;       /* Owning user namespace */
 63         struct idr              netns_ids;
 64 
 65         struct ns_common        ns;
 66 
 67         struct proc_dir_entry   *proc_net;
 68         struct proc_dir_entry   *proc_net_stat;
 69 
 70 #ifdef CONFIG_SYSCTL
 71         struct ctl_table_set    sysctls;
 72 #endif
 73 
 74         struct sock             *rtnl;                  /* rtnetlink socket */
 75         struct sock             *genl_sock;
 76 
 77         struct list_head        dev_base_head;
 78         struct hlist_head       *dev_name_head;
 79         struct hlist_head       *dev_index_head;
 80         unsigned int            dev_base_seq;   /* protected by rtnl_mutex */
 81         int                     ifindex;
 82         unsigned int            dev_unreg_count;
 83 
 84         /* core fib_rules */
 85         struct list_head        rules_ops;
 86 
 87 
 88         struct net_device       *loopback_dev;          /* The loopback */
 89         struct netns_core       core;
 90         struct netns_mib        mib;
 91         struct netns_packet     packet;
 92         struct netns_unix       unx;
 93         struct netns_ipv4       ipv4;
 94 #if IS_ENABLED(CONFIG_IPV6)
 95         struct netns_ipv6       ipv6;
 96 #endif
 97 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
 98         struct netns_ieee802154_lowpan  ieee802154_lowpan;
 99 #endif
100 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
101         struct netns_sctp       sctp;
102 #endif
103 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
104         struct netns_dccp       dccp;
105 #endif
106 #ifdef CONFIG_NETFILTER
107         struct netns_nf         nf;
108         struct netns_xt         xt;
109 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
110         struct netns_ct         ct;
111 #endif
112 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
113         struct netns_nftables   nft;
114 #endif
115 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
116         struct netns_nf_frag    nf_frag;
117 #endif
118         struct sock             *nfnl;
119         struct sock             *nfnl_stash;
120 #endif
121 #ifdef CONFIG_WEXT_CORE
122         struct sk_buff_head     wext_nlevents;
123 #endif
124         struct net_generic __rcu        *gen;
125 
126         /* Note : following structs are cache line aligned */
127 #ifdef CONFIG_XFRM
128         struct netns_xfrm       xfrm;
129 #endif
130 #if IS_ENABLED(CONFIG_IP_VS)
131         struct netns_ipvs       *ipvs;
132 #endif
133         struct sock             *diag_nlsk;
134         atomic_t                fnhe_genid;
135 };
136 
137 #include <linux/seq_file_net.h>
138 
139 /* Init's network namespace */
140 extern struct net init_net;
141 
142 #ifdef CONFIG_NET_NS
143 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
144                         struct net *old_net);
145 
146 #else /* CONFIG_NET_NS */
147 #include <linux/sched.h>
148 #include <linux/nsproxy.h>
149 static inline struct net *copy_net_ns(unsigned long flags,
150         struct user_namespace *user_ns, struct net *old_net)
151 {
152         if (flags & CLONE_NEWNET)
153                 return ERR_PTR(-EINVAL);
154         return old_net;
155 }
156 #endif /* CONFIG_NET_NS */
157 
158 
159 extern struct list_head net_namespace_list;
160 
161 struct net *get_net_ns_by_pid(pid_t pid);
162 struct net *get_net_ns_by_fd(int pid);
163 
164 #ifdef CONFIG_SYSCTL
165 void ipx_register_sysctl(void);
166 void ipx_unregister_sysctl(void);
167 #else
168 #define ipx_register_sysctl()
169 #define ipx_unregister_sysctl()
170 #endif
171 
172 #ifdef CONFIG_NET_NS
173 void __put_net(struct net *net);
174 
175 static inline struct net *get_net(struct net *net)
176 {
177         atomic_inc(&net->count);
178         return net;
179 }
180 
181 static inline struct net *maybe_get_net(struct net *net)
182 {
183         /* Used when we know struct net exists but we
184          * aren't guaranteed a previous reference count
185          * exists.  If the reference count is zero this
186          * function fails and returns NULL.
187          */
188         if (!atomic_inc_not_zero(&net->count))
189                 net = NULL;
190         return net;
191 }
192 
193 static inline void put_net(struct net *net)
194 {
195         if (atomic_dec_and_test(&net->count))
196                 __put_net(net);
197 }
198 
199 static inline
200 int net_eq(const struct net *net1, const struct net *net2)
201 {
202         return net1 == net2;
203 }
204 
205 void net_drop_ns(void *);
206 
207 #else
208 
209 static inline struct net *get_net(struct net *net)
210 {
211         return net;
212 }
213 
214 static inline void put_net(struct net *net)
215 {
216 }
217 
218 static inline struct net *maybe_get_net(struct net *net)
219 {
220         return net;
221 }
222 
223 static inline
224 int net_eq(const struct net *net1, const struct net *net2)
225 {
226         return 1;
227 }
228 
229 #define net_drop_ns NULL
230 #endif
231 
232 
233 #ifdef NETNS_REFCNT_DEBUG
234 static inline struct net *hold_net(struct net *net)
235 {
236         if (net)
237                 atomic_inc(&net->use_count);
238         return net;
239 }
240 
241 static inline void release_net(struct net *net)
242 {
243         if (net)
244                 atomic_dec(&net->use_count);
245 }
246 #else
247 static inline struct net *hold_net(struct net *net)
248 {
249         return net;
250 }
251 
252 static inline void release_net(struct net *net)
253 {
254 }
255 #endif
256 
257 #ifdef CONFIG_NET_NS
258 
259 static inline void write_pnet(struct net **pnet, struct net *net)
260 {
261         *pnet = net;
262 }
263 
264 static inline struct net *read_pnet(struct net * const *pnet)
265 {
266         return *pnet;
267 }
268 
269 #else
270 
271 #define write_pnet(pnet, net)   do { (void)(net);} while (0)
272 #define read_pnet(pnet)         (&init_net)
273 
274 #endif
275 
276 #define for_each_net(VAR)                               \
277         list_for_each_entry(VAR, &net_namespace_list, list)
278 
279 #define for_each_net_rcu(VAR)                           \
280         list_for_each_entry_rcu(VAR, &net_namespace_list, list)
281 
282 #ifdef CONFIG_NET_NS
283 #define __net_init
284 #define __net_exit
285 #define __net_initdata
286 #define __net_initconst
287 #else
288 #define __net_init      __init
289 #define __net_exit      __exit_refok
290 #define __net_initdata  __initdata
291 #define __net_initconst __initconst
292 #endif
293 
294 int peernet2id(struct net *net, struct net *peer);
295 struct net *get_net_ns_by_id(struct net *net, int id);
296 
297 struct pernet_operations {
298         struct list_head list;
299         int (*init)(struct net *net);
300         void (*exit)(struct net *net);
301         void (*exit_batch)(struct list_head *net_exit_list);
302         int *id;
303         size_t size;
304 };
305 
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  *
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.
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  */
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 *);
329 
330 struct ctl_table;
331 struct ctl_table_header;
332 
333 #ifdef CONFIG_SYSCTL
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);
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 
350 static inline int rt_genid_ipv4(struct net *net)
351 {
352         return atomic_read(&net->ipv4.rt_genid);
353 }
354 
355 static inline void rt_genid_bump_ipv4(struct net *net)
356 {
357         atomic_inc(&net->ipv4.rt_genid);
358 }
359 
360 extern void (*__fib6_flush_trees)(struct net *net);
361 static inline void rt_genid_bump_ipv6(struct net *net)
362 {
363         if (__fib6_flush_trees)
364                 __fib6_flush_trees(net);
365 }
366 
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 }
373 #endif
374 
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);
380 }
381 
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 
392 #endif /* __NET_NET_NAMESPACE_H */
393 

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