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Linux/include/net/net_namespace.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * Operations on the network namespace
  4  */
  5 #ifndef __NET_NET_NAMESPACE_H
  6 #define __NET_NET_NAMESPACE_H
  7 
  8 #include <linux/atomic.h>
  9 #include <linux/refcount.h>
 10 #include <linux/workqueue.h>
 11 #include <linux/list.h>
 12 #include <linux/sysctl.h>
 13 #include <linux/uidgid.h>
 14 
 15 #include <net/flow.h>
 16 #include <net/netns/core.h>
 17 #include <net/netns/mib.h>
 18 #include <net/netns/unix.h>
 19 #include <net/netns/packet.h>
 20 #include <net/netns/ipv4.h>
 21 #include <net/netns/ipv6.h>
 22 #include <net/netns/nexthop.h>
 23 #include <net/netns/ieee802154_6lowpan.h>
 24 #include <net/netns/sctp.h>
 25 #include <net/netns/dccp.h>
 26 #include <net/netns/netfilter.h>
 27 #include <net/netns/x_tables.h>
 28 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
 29 #include <net/netns/conntrack.h>
 30 #endif
 31 #include <net/netns/nftables.h>
 32 #include <net/netns/xfrm.h>
 33 #include <net/netns/mpls.h>
 34 #include <net/netns/can.h>
 35 #include <net/netns/xdp.h>
 36 #include <linux/ns_common.h>
 37 #include <linux/idr.h>
 38 #include <linux/skbuff.h>
 39 #include <linux/notifier.h>
 40 
 41 struct user_namespace;
 42 struct proc_dir_entry;
 43 struct net_device;
 44 struct sock;
 45 struct ctl_table_header;
 46 struct net_generic;
 47 struct uevent_sock;
 48 struct netns_ipvs;
 49 struct bpf_prog;
 50 
 51 
 52 #define NETDEV_HASHBITS    8
 53 #define NETDEV_HASHENTRIES (1 << NETDEV_HASHBITS)
 54 
 55 struct net {
 56         /* First cache line can be often dirtied.
 57          * Do not place here read-mostly fields.
 58          */
 59         refcount_t              passive;        /* To decide when the network
 60                                                  * namespace should be freed.
 61                                                  */
 62         refcount_t              count;          /* To decided when the network
 63                                                  *  namespace should be shut down.
 64                                                  */
 65         spinlock_t              rules_mod_lock;
 66 
 67         unsigned int            dev_unreg_count;
 68 
 69         unsigned int            dev_base_seq;   /* protected by rtnl_mutex */
 70         int                     ifindex;
 71 
 72         spinlock_t              nsid_lock;
 73         atomic_t                fnhe_genid;
 74 
 75         struct list_head        list;           /* list of network namespaces */
 76         struct list_head        exit_list;      /* To linked to call pernet exit
 77                                                  * methods on dead net (
 78                                                  * pernet_ops_rwsem read locked),
 79                                                  * or to unregister pernet ops
 80                                                  * (pernet_ops_rwsem write locked).
 81                                                  */
 82         struct llist_node       cleanup_list;   /* namespaces on death row */
 83 
 84 #ifdef CONFIG_KEYS
 85         struct key_tag          *key_domain;    /* Key domain of operation tag */
 86 #endif
 87         struct user_namespace   *user_ns;       /* Owning user namespace */
 88         struct ucounts          *ucounts;
 89         struct idr              netns_ids;
 90 
 91         struct ns_common        ns;
 92 
 93         struct list_head        dev_base_head;
 94         struct proc_dir_entry   *proc_net;
 95         struct proc_dir_entry   *proc_net_stat;
 96 
 97 #ifdef CONFIG_SYSCTL
 98         struct ctl_table_set    sysctls;
 99 #endif
100 
101         struct sock             *rtnl;                  /* rtnetlink socket */
102         struct sock             *genl_sock;
103 
104         struct uevent_sock      *uevent_sock;           /* uevent socket */
105 
106         struct hlist_head       *dev_name_head;
107         struct hlist_head       *dev_index_head;
108         struct raw_notifier_head        netdev_chain;
109 
110         /* Note that @hash_mix can be read millions times per second,
111          * it is critical that it is on a read_mostly cache line.
112          */
113         u32                     hash_mix;
114 
115         struct net_device       *loopback_dev;          /* The loopback */
116 
117         /* core fib_rules */
118         struct list_head        rules_ops;
119 
120         struct netns_core       core;
121         struct netns_mib        mib;
122         struct netns_packet     packet;
123         struct netns_unix       unx;
124         struct netns_nexthop    nexthop;
125         struct netns_ipv4       ipv4;
126 #if IS_ENABLED(CONFIG_IPV6)
127         struct netns_ipv6       ipv6;
128 #endif
129 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
130         struct netns_ieee802154_lowpan  ieee802154_lowpan;
131 #endif
132 #if defined(CONFIG_IP_SCTP) || defined(CONFIG_IP_SCTP_MODULE)
133         struct netns_sctp       sctp;
134 #endif
135 #if defined(CONFIG_IP_DCCP) || defined(CONFIG_IP_DCCP_MODULE)
136         struct netns_dccp       dccp;
137 #endif
138 #ifdef CONFIG_NETFILTER
139         struct netns_nf         nf;
140         struct netns_xt         xt;
141 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
142         struct netns_ct         ct;
143 #endif
144 #if defined(CONFIG_NF_TABLES) || defined(CONFIG_NF_TABLES_MODULE)
145         struct netns_nftables   nft;
146 #endif
147 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
148         struct netns_nf_frag    nf_frag;
149         struct ctl_table_header *nf_frag_frags_hdr;
150 #endif
151         struct sock             *nfnl;
152         struct sock             *nfnl_stash;
153 #if IS_ENABLED(CONFIG_NETFILTER_NETLINK_ACCT)
154         struct list_head        nfnl_acct_list;
155 #endif
156 #if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
157         struct list_head        nfct_timeout_list;
158 #endif
159 #endif
160 #ifdef CONFIG_WEXT_CORE
161         struct sk_buff_head     wext_nlevents;
162 #endif
163         struct net_generic __rcu        *gen;
164 
165         struct bpf_prog __rcu   *flow_dissector_prog;
166 
167         /* Note : following structs are cache line aligned */
168 #ifdef CONFIG_XFRM
169         struct netns_xfrm       xfrm;
170 #endif
171 
172         atomic64_t              net_cookie; /* written once */
173 
174 #if IS_ENABLED(CONFIG_IP_VS)
175         struct netns_ipvs       *ipvs;
176 #endif
177 #if IS_ENABLED(CONFIG_MPLS)
178         struct netns_mpls       mpls;
179 #endif
180 #if IS_ENABLED(CONFIG_CAN)
181         struct netns_can        can;
182 #endif
183 #ifdef CONFIG_XDP_SOCKETS
184         struct netns_xdp        xdp;
185 #endif
186 #if IS_ENABLED(CONFIG_CRYPTO_USER)
187         struct sock             *crypto_nlsk;
188 #endif
189         struct sock             *diag_nlsk;
190 } __randomize_layout;
191 
192 #include <linux/seq_file_net.h>
193 
194 /* Init's network namespace */
195 extern struct net init_net;
196 
197 #ifdef CONFIG_NET_NS
198 struct net *copy_net_ns(unsigned long flags, struct user_namespace *user_ns,
199                         struct net *old_net);
200 
201 void net_ns_get_ownership(const struct net *net, kuid_t *uid, kgid_t *gid);
202 
203 void net_ns_barrier(void);
204 #else /* CONFIG_NET_NS */
205 #include <linux/sched.h>
206 #include <linux/nsproxy.h>
207 static inline struct net *copy_net_ns(unsigned long flags,
208         struct user_namespace *user_ns, struct net *old_net)
209 {
210         if (flags & CLONE_NEWNET)
211                 return ERR_PTR(-EINVAL);
212         return old_net;
213 }
214 
215 static inline void net_ns_get_ownership(const struct net *net,
216                                         kuid_t *uid, kgid_t *gid)
217 {
218         *uid = GLOBAL_ROOT_UID;
219         *gid = GLOBAL_ROOT_GID;
220 }
221 
222 static inline void net_ns_barrier(void) {}
223 #endif /* CONFIG_NET_NS */
224 
225 
226 extern struct list_head net_namespace_list;
227 
228 struct net *get_net_ns_by_pid(pid_t pid);
229 struct net *get_net_ns_by_fd(int fd);
230 
231 u64 net_gen_cookie(struct net *net);
232 
233 #ifdef CONFIG_SYSCTL
234 void ipx_register_sysctl(void);
235 void ipx_unregister_sysctl(void);
236 #else
237 #define ipx_register_sysctl()
238 #define ipx_unregister_sysctl()
239 #endif
240 
241 #ifdef CONFIG_NET_NS
242 void __put_net(struct net *net);
243 
244 static inline struct net *get_net(struct net *net)
245 {
246         refcount_inc(&net->count);
247         return net;
248 }
249 
250 static inline struct net *maybe_get_net(struct net *net)
251 {
252         /* Used when we know struct net exists but we
253          * aren't guaranteed a previous reference count
254          * exists.  If the reference count is zero this
255          * function fails and returns NULL.
256          */
257         if (!refcount_inc_not_zero(&net->count))
258                 net = NULL;
259         return net;
260 }
261 
262 static inline void put_net(struct net *net)
263 {
264         if (refcount_dec_and_test(&net->count))
265                 __put_net(net);
266 }
267 
268 static inline
269 int net_eq(const struct net *net1, const struct net *net2)
270 {
271         return net1 == net2;
272 }
273 
274 static inline int check_net(const struct net *net)
275 {
276         return refcount_read(&net->count) != 0;
277 }
278 
279 void net_drop_ns(void *);
280 
281 #else
282 
283 static inline struct net *get_net(struct net *net)
284 {
285         return net;
286 }
287 
288 static inline void put_net(struct net *net)
289 {
290 }
291 
292 static inline struct net *maybe_get_net(struct net *net)
293 {
294         return net;
295 }
296 
297 static inline
298 int net_eq(const struct net *net1, const struct net *net2)
299 {
300         return 1;
301 }
302 
303 static inline int check_net(const struct net *net)
304 {
305         return 1;
306 }
307 
308 #define net_drop_ns NULL
309 #endif
310 
311 
312 typedef struct {
313 #ifdef CONFIG_NET_NS
314         struct net *net;
315 #endif
316 } possible_net_t;
317 
318 static inline void write_pnet(possible_net_t *pnet, struct net *net)
319 {
320 #ifdef CONFIG_NET_NS
321         pnet->net = net;
322 #endif
323 }
324 
325 static inline struct net *read_pnet(const possible_net_t *pnet)
326 {
327 #ifdef CONFIG_NET_NS
328         return pnet->net;
329 #else
330         return &init_net;
331 #endif
332 }
333 
334 /* Protected by net_rwsem */
335 #define for_each_net(VAR)                               \
336         list_for_each_entry(VAR, &net_namespace_list, list)
337 #define for_each_net_continue_reverse(VAR)              \
338         list_for_each_entry_continue_reverse(VAR, &net_namespace_list, list)
339 #define for_each_net_rcu(VAR)                           \
340         list_for_each_entry_rcu(VAR, &net_namespace_list, list)
341 
342 #ifdef CONFIG_NET_NS
343 #define __net_init
344 #define __net_exit
345 #define __net_initdata
346 #define __net_initconst
347 #else
348 #define __net_init      __init
349 #define __net_exit      __ref
350 #define __net_initdata  __initdata
351 #define __net_initconst __initconst
352 #endif
353 
354 int peernet2id_alloc(struct net *net, struct net *peer, gfp_t gfp);
355 int peernet2id(const struct net *net, struct net *peer);
356 bool peernet_has_id(const struct net *net, struct net *peer);
357 struct net *get_net_ns_by_id(const struct net *net, int id);
358 
359 struct pernet_operations {
360         struct list_head list;
361         /*
362          * Below methods are called without any exclusive locks.
363          * More than one net may be constructed and destructed
364          * in parallel on several cpus. Every pernet_operations
365          * have to keep in mind all other pernet_operations and
366          * to introduce a locking, if they share common resources.
367          *
368          * The only time they are called with exclusive lock is
369          * from register_pernet_subsys(), unregister_pernet_subsys()
370          * register_pernet_device() and unregister_pernet_device().
371          *
372          * Exit methods using blocking RCU primitives, such as
373          * synchronize_rcu(), should be implemented via exit_batch.
374          * Then, destruction of a group of net requires single
375          * synchronize_rcu() related to these pernet_operations,
376          * instead of separate synchronize_rcu() for every net.
377          * Please, avoid synchronize_rcu() at all, where it's possible.
378          *
379          * Note that a combination of pre_exit() and exit() can
380          * be used, since a synchronize_rcu() is guaranteed between
381          * the calls.
382          */
383         int (*init)(struct net *net);
384         void (*pre_exit)(struct net *net);
385         void (*exit)(struct net *net);
386         void (*exit_batch)(struct list_head *net_exit_list);
387         unsigned int *id;
388         size_t size;
389 };
390 
391 /*
392  * Use these carefully.  If you implement a network device and it
393  * needs per network namespace operations use device pernet operations,
394  * otherwise use pernet subsys operations.
395  *
396  * Network interfaces need to be removed from a dying netns _before_
397  * subsys notifiers can be called, as most of the network code cleanup
398  * (which is done from subsys notifiers) runs with the assumption that
399  * dev_remove_pack has been called so no new packets will arrive during
400  * and after the cleanup functions have been called.  dev_remove_pack
401  * is not per namespace so instead the guarantee of no more packets
402  * arriving in a network namespace is provided by ensuring that all
403  * network devices and all sockets have left the network namespace
404  * before the cleanup methods are called.
405  *
406  * For the longest time the ipv4 icmp code was registered as a pernet
407  * device which caused kernel oops, and panics during network
408  * namespace cleanup.   So please don't get this wrong.
409  */
410 int register_pernet_subsys(struct pernet_operations *);
411 void unregister_pernet_subsys(struct pernet_operations *);
412 int register_pernet_device(struct pernet_operations *);
413 void unregister_pernet_device(struct pernet_operations *);
414 
415 struct ctl_table;
416 struct ctl_table_header;
417 
418 #ifdef CONFIG_SYSCTL
419 int net_sysctl_init(void);
420 struct ctl_table_header *register_net_sysctl(struct net *net, const char *path,
421                                              struct ctl_table *table);
422 void unregister_net_sysctl_table(struct ctl_table_header *header);
423 #else
424 static inline int net_sysctl_init(void) { return 0; }
425 static inline struct ctl_table_header *register_net_sysctl(struct net *net,
426         const char *path, struct ctl_table *table)
427 {
428         return NULL;
429 }
430 static inline void unregister_net_sysctl_table(struct ctl_table_header *header)
431 {
432 }
433 #endif
434 
435 static inline int rt_genid_ipv4(const struct net *net)
436 {
437         return atomic_read(&net->ipv4.rt_genid);
438 }
439 
440 #if IS_ENABLED(CONFIG_IPV6)
441 static inline int rt_genid_ipv6(const struct net *net)
442 {
443         return atomic_read(&net->ipv6.fib6_sernum);
444 }
445 #endif
446 
447 static inline void rt_genid_bump_ipv4(struct net *net)
448 {
449         atomic_inc(&net->ipv4.rt_genid);
450 }
451 
452 extern void (*__fib6_flush_trees)(struct net *net);
453 static inline void rt_genid_bump_ipv6(struct net *net)
454 {
455         if (__fib6_flush_trees)
456                 __fib6_flush_trees(net);
457 }
458 
459 #if IS_ENABLED(CONFIG_IEEE802154_6LOWPAN)
460 static inline struct netns_ieee802154_lowpan *
461 net_ieee802154_lowpan(struct net *net)
462 {
463         return &net->ieee802154_lowpan;
464 }
465 #endif
466 
467 /* For callers who don't really care about whether it's IPv4 or IPv6 */
468 static inline void rt_genid_bump_all(struct net *net)
469 {
470         rt_genid_bump_ipv4(net);
471         rt_genid_bump_ipv6(net);
472 }
473 
474 static inline int fnhe_genid(const struct net *net)
475 {
476         return atomic_read(&net->fnhe_genid);
477 }
478 
479 static inline void fnhe_genid_bump(struct net *net)
480 {
481         atomic_inc(&net->fnhe_genid);
482 }
483 
484 #endif /* __NET_NET_NAMESPACE_H */
485 

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