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

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