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TOMOYO Linux Cross Reference
Linux/net/bridge/br_private.h

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  1 /*
  2  *      Linux ethernet bridge
  3  *
  4  *      Authors:
  5  *      Lennert Buytenhek               <buytenh@gnu.org>
  6  *
  7  *      This program is free software; you can redistribute it and/or
  8  *      modify it under the terms of the GNU General Public License
  9  *      as published by the Free Software Foundation; either version
 10  *      2 of the License, or (at your option) any later version.
 11  */
 12 
 13 #ifndef _BR_PRIVATE_H
 14 #define _BR_PRIVATE_H
 15 
 16 #include <linux/netdevice.h>
 17 #include <linux/if_bridge.h>
 18 #include <linux/netpoll.h>
 19 #include <linux/u64_stats_sync.h>
 20 #include <net/route.h>
 21 
 22 #define BR_HASH_BITS 8
 23 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
 24 
 25 #define BR_HOLD_TIME (1*HZ)
 26 
 27 #define BR_PORT_BITS    10
 28 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
 29 
 30 #define BR_VERSION      "2.3"
 31 
 32 /* Control of forwarding link local multicast */
 33 #define BR_GROUPFWD_DEFAULT     0
 34 /* Don't allow forwarding control protocols like STP and LLDP */
 35 #define BR_GROUPFWD_RESTRICTED  0x4007u
 36 
 37 /* Path to usermode spanning tree program */
 38 #define BR_STP_PROG     "/sbin/bridge-stp"
 39 
 40 typedef struct bridge_id bridge_id;
 41 typedef struct mac_addr mac_addr;
 42 typedef __u16 port_id;
 43 
 44 struct bridge_id
 45 {
 46         unsigned char   prio[2];
 47         unsigned char   addr[6];
 48 };
 49 
 50 struct mac_addr
 51 {
 52         unsigned char   addr[6];
 53 };
 54 
 55 struct br_ip
 56 {
 57         union {
 58                 __be32  ip4;
 59 #if IS_ENABLED(CONFIG_IPV6)
 60                 struct in6_addr ip6;
 61 #endif
 62         } u;
 63         __be16          proto;
 64 };
 65 
 66 struct net_bridge_fdb_entry
 67 {
 68         struct hlist_node               hlist;
 69         struct net_bridge_port          *dst;
 70 
 71         struct rcu_head                 rcu;
 72         unsigned long                   updated;
 73         unsigned long                   used;
 74         mac_addr                        addr;
 75         unsigned char                   is_local;
 76         unsigned char                   is_static;
 77 };
 78 
 79 struct net_bridge_port_group {
 80         struct net_bridge_port          *port;
 81         struct net_bridge_port_group __rcu *next;
 82         struct hlist_node               mglist;
 83         struct rcu_head                 rcu;
 84         struct timer_list               timer;
 85         struct br_ip                    addr;
 86         unsigned char                   state;
 87 };
 88 
 89 struct net_bridge_mdb_entry
 90 {
 91         struct hlist_node               hlist[2];
 92         struct net_bridge               *br;
 93         struct net_bridge_port_group __rcu *ports;
 94         struct rcu_head                 rcu;
 95         struct timer_list               timer;
 96         struct br_ip                    addr;
 97         bool                            mglist;
 98 };
 99 
100 struct net_bridge_mdb_htable
101 {
102         struct hlist_head               *mhash;
103         struct rcu_head                 rcu;
104         struct net_bridge_mdb_htable    *old;
105         u32                             size;
106         u32                             max;
107         u32                             secret;
108         u32                             ver;
109 };
110 
111 struct net_bridge_port
112 {
113         struct net_bridge               *br;
114         struct net_device               *dev;
115         struct list_head                list;
116 
117         /* STP */
118         u8                              priority;
119         u8                              state;
120         u16                             port_no;
121         unsigned char                   topology_change_ack;
122         unsigned char                   config_pending;
123         port_id                         port_id;
124         port_id                         designated_port;
125         bridge_id                       designated_root;
126         bridge_id                       designated_bridge;
127         u32                             path_cost;
128         u32                             designated_cost;
129         unsigned long                   designated_age;
130 
131         struct timer_list               forward_delay_timer;
132         struct timer_list               hold_timer;
133         struct timer_list               message_age_timer;
134         struct kobject                  kobj;
135         struct rcu_head                 rcu;
136 
137         unsigned long                   flags;
138 #define BR_HAIRPIN_MODE         0x00000001
139 #define BR_BPDU_GUARD           0x00000002
140 #define BR_ROOT_BLOCK           0x00000004
141 #define BR_MULTICAST_FAST_LEAVE 0x00000008
142 
143 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
144         u32                             multicast_startup_queries_sent;
145         unsigned char                   multicast_router;
146         struct timer_list               multicast_router_timer;
147         struct timer_list               multicast_query_timer;
148         struct hlist_head               mglist;
149         struct hlist_node               rlist;
150 #endif
151 
152 #ifdef CONFIG_SYSFS
153         char                            sysfs_name[IFNAMSIZ];
154 #endif
155 
156 #ifdef CONFIG_NET_POLL_CONTROLLER
157         struct netpoll                  *np;
158 #endif
159 };
160 
161 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
162 
163 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
164 {
165         struct net_bridge_port *port =
166                         rcu_dereference_rtnl(dev->rx_handler_data);
167 
168         return br_port_exists(dev) ? port : NULL;
169 }
170 
171 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
172 {
173         return br_port_exists(dev) ?
174                 rtnl_dereference(dev->rx_handler_data) : NULL;
175 }
176 
177 struct br_cpu_netstats {
178         u64                     rx_packets;
179         u64                     rx_bytes;
180         u64                     tx_packets;
181         u64                     tx_bytes;
182         struct u64_stats_sync   syncp;
183 };
184 
185 struct net_bridge
186 {
187         spinlock_t                      lock;
188         struct list_head                port_list;
189         struct net_device               *dev;
190 
191         struct br_cpu_netstats __percpu *stats;
192         spinlock_t                      hash_lock;
193         struct hlist_head               hash[BR_HASH_SIZE];
194 #ifdef CONFIG_BRIDGE_NETFILTER
195         struct rtable                   fake_rtable;
196         bool                            nf_call_iptables;
197         bool                            nf_call_ip6tables;
198         bool                            nf_call_arptables;
199 #endif
200         unsigned long                   flags;
201 #define BR_SET_MAC_ADDR         0x00000001
202 
203         u16                             group_fwd_mask;
204 
205         /* STP */
206         bridge_id                       designated_root;
207         bridge_id                       bridge_id;
208         u32                             root_path_cost;
209         unsigned long                   max_age;
210         unsigned long                   hello_time;
211         unsigned long                   forward_delay;
212         unsigned long                   bridge_max_age;
213         unsigned long                   ageing_time;
214         unsigned long                   bridge_hello_time;
215         unsigned long                   bridge_forward_delay;
216 
217         u8                              group_addr[ETH_ALEN];
218         u16                             root_port;
219 
220         enum {
221                 BR_NO_STP,              /* no spanning tree */
222                 BR_KERNEL_STP,          /* old STP in kernel */
223                 BR_USER_STP,            /* new RSTP in userspace */
224         } stp_enabled;
225 
226         unsigned char                   topology_change;
227         unsigned char                   topology_change_detected;
228 
229 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
230         unsigned char                   multicast_router;
231 
232         u8                              multicast_disabled:1;
233         u8                              multicast_querier:1;
234 
235         u32                             hash_elasticity;
236         u32                             hash_max;
237 
238         u32                             multicast_last_member_count;
239         u32                             multicast_startup_queries_sent;
240         u32                             multicast_startup_query_count;
241 
242         unsigned long                   multicast_last_member_interval;
243         unsigned long                   multicast_membership_interval;
244         unsigned long                   multicast_querier_interval;
245         unsigned long                   multicast_query_interval;
246         unsigned long                   multicast_query_response_interval;
247         unsigned long                   multicast_startup_query_interval;
248 
249         spinlock_t                      multicast_lock;
250         struct net_bridge_mdb_htable __rcu *mdb;
251         struct hlist_head               router_list;
252 
253         struct timer_list               multicast_router_timer;
254         struct timer_list               multicast_querier_timer;
255         struct timer_list               multicast_query_timer;
256 #endif
257 
258         struct timer_list               hello_timer;
259         struct timer_list               tcn_timer;
260         struct timer_list               topology_change_timer;
261         struct timer_list               gc_timer;
262         struct kobject                  *ifobj;
263 };
264 
265 struct br_input_skb_cb {
266         struct net_device *brdev;
267 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
268         int igmp;
269         int mrouters_only;
270 #endif
271 };
272 
273 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
274 
275 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
276 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
277 #else
278 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
279 #endif
280 
281 #define br_printk(level, br, format, args...)   \
282         printk(level "%s: " format, (br)->dev->name, ##args)
283 
284 #define br_err(__br, format, args...)                   \
285         br_printk(KERN_ERR, __br, format, ##args)
286 #define br_warn(__br, format, args...)                  \
287         br_printk(KERN_WARNING, __br, format, ##args)
288 #define br_notice(__br, format, args...)                \
289         br_printk(KERN_NOTICE, __br, format, ##args)
290 #define br_info(__br, format, args...)                  \
291         br_printk(KERN_INFO, __br, format, ##args)
292 
293 #define br_debug(br, format, args...)                   \
294         pr_debug("%s: " format,  (br)->dev->name, ##args)
295 
296 extern struct notifier_block br_device_notifier;
297 
298 /* called under bridge lock */
299 static inline int br_is_root_bridge(const struct net_bridge *br)
300 {
301         return !memcmp(&br->bridge_id, &br->designated_root, 8);
302 }
303 
304 /* br_device.c */
305 extern void br_dev_setup(struct net_device *dev);
306 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
307 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
308                                struct net_device *dev);
309 #ifdef CONFIG_NET_POLL_CONTROLLER
310 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
311 {
312         return br->dev->npinfo;
313 }
314 
315 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
316                                        struct sk_buff *skb)
317 {
318         struct netpoll *np = p->np;
319 
320         if (np)
321                 netpoll_send_skb(np, skb);
322 }
323 
324 extern int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp);
325 extern void br_netpoll_disable(struct net_bridge_port *p);
326 #else
327 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
328 {
329         return NULL;
330 }
331 
332 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
333                                        struct sk_buff *skb)
334 {
335 }
336 
337 static inline int br_netpoll_enable(struct net_bridge_port *p, gfp_t gfp)
338 {
339         return 0;
340 }
341 
342 static inline void br_netpoll_disable(struct net_bridge_port *p)
343 {
344 }
345 #endif
346 
347 /* br_fdb.c */
348 extern int br_fdb_init(void);
349 extern void br_fdb_fini(void);
350 extern void br_fdb_flush(struct net_bridge *br);
351 extern void br_fdb_changeaddr(struct net_bridge_port *p,
352                               const unsigned char *newaddr);
353 extern void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
354 extern void br_fdb_cleanup(unsigned long arg);
355 extern void br_fdb_delete_by_port(struct net_bridge *br,
356                                   const struct net_bridge_port *p, int do_all);
357 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
358                                                  const unsigned char *addr);
359 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
360 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
361                           unsigned long count, unsigned long off);
362 extern int br_fdb_insert(struct net_bridge *br,
363                          struct net_bridge_port *source,
364                          const unsigned char *addr);
365 extern void br_fdb_update(struct net_bridge *br,
366                           struct net_bridge_port *source,
367                           const unsigned char *addr);
368 
369 extern int br_fdb_delete(struct ndmsg *ndm,
370                          struct net_device *dev,
371                          const unsigned char *addr);
372 extern int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[],
373                       struct net_device *dev,
374                       const unsigned char *addr,
375                       u16 nlh_flags);
376 extern int br_fdb_dump(struct sk_buff *skb,
377                        struct netlink_callback *cb,
378                        struct net_device *dev,
379                        int idx);
380 
381 /* br_forward.c */
382 extern void br_deliver(const struct net_bridge_port *to,
383                 struct sk_buff *skb);
384 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
385 extern void br_forward(const struct net_bridge_port *to,
386                 struct sk_buff *skb, struct sk_buff *skb0);
387 extern int br_forward_finish(struct sk_buff *skb);
388 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
389 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
390                              struct sk_buff *skb2);
391 
392 /* br_if.c */
393 extern void br_port_carrier_check(struct net_bridge_port *p);
394 extern int br_add_bridge(struct net *net, const char *name);
395 extern int br_del_bridge(struct net *net, const char *name);
396 extern void br_net_exit(struct net *net);
397 extern int br_add_if(struct net_bridge *br,
398               struct net_device *dev);
399 extern int br_del_if(struct net_bridge *br,
400               struct net_device *dev);
401 extern int br_min_mtu(const struct net_bridge *br);
402 extern netdev_features_t br_features_recompute(struct net_bridge *br,
403         netdev_features_t features);
404 
405 /* br_input.c */
406 extern int br_handle_frame_finish(struct sk_buff *skb);
407 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
408 
409 /* br_ioctl.c */
410 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
411 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
412 
413 /* br_multicast.c */
414 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
415 extern unsigned int br_mdb_rehash_seq;
416 extern int br_multicast_rcv(struct net_bridge *br,
417                             struct net_bridge_port *port,
418                             struct sk_buff *skb);
419 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
420                                                struct sk_buff *skb);
421 extern void br_multicast_add_port(struct net_bridge_port *port);
422 extern void br_multicast_del_port(struct net_bridge_port *port);
423 extern void br_multicast_enable_port(struct net_bridge_port *port);
424 extern void br_multicast_disable_port(struct net_bridge_port *port);
425 extern void br_multicast_init(struct net_bridge *br);
426 extern void br_multicast_open(struct net_bridge *br);
427 extern void br_multicast_stop(struct net_bridge *br);
428 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
429                                  struct sk_buff *skb);
430 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
431                                  struct sk_buff *skb, struct sk_buff *skb2);
432 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
433 extern int br_multicast_set_port_router(struct net_bridge_port *p,
434                                         unsigned long val);
435 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
436 extern int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
437 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
438 extern struct net_bridge_mdb_entry *br_mdb_ip_get(
439                                 struct net_bridge_mdb_htable *mdb,
440                                 struct br_ip *dst);
441 extern struct net_bridge_mdb_entry *br_multicast_new_group(struct net_bridge *br,
442                                 struct net_bridge_port *port, struct br_ip *group);
443 extern void br_multicast_free_pg(struct rcu_head *head);
444 extern struct net_bridge_port_group *br_multicast_new_port_group(
445                                 struct net_bridge_port *port,
446                                 struct br_ip *group,
447                                 struct net_bridge_port_group *next,
448                                 unsigned char state);
449 extern void br_mdb_init(void);
450 extern void br_mdb_uninit(void);
451 extern void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
452                           struct br_ip *group, int type);
453 
454 #define mlock_dereference(X, br) \
455         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
456 
457 #if IS_ENABLED(CONFIG_IPV6)
458 #include <net/addrconf.h>
459 static inline int ipv6_is_transient_multicast(const struct in6_addr *addr)
460 {
461         if (ipv6_addr_is_multicast(addr) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr))
462                 return 1;
463         return 0;
464 }
465 #endif
466 
467 static inline bool br_multicast_is_router(struct net_bridge *br)
468 {
469         return br->multicast_router == 2 ||
470                (br->multicast_router == 1 &&
471                 timer_pending(&br->multicast_router_timer));
472 }
473 #else
474 static inline int br_multicast_rcv(struct net_bridge *br,
475                                    struct net_bridge_port *port,
476                                    struct sk_buff *skb)
477 {
478         return 0;
479 }
480 
481 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
482                                                       struct sk_buff *skb)
483 {
484         return NULL;
485 }
486 
487 static inline void br_multicast_add_port(struct net_bridge_port *port)
488 {
489 }
490 
491 static inline void br_multicast_del_port(struct net_bridge_port *port)
492 {
493 }
494 
495 static inline void br_multicast_enable_port(struct net_bridge_port *port)
496 {
497 }
498 
499 static inline void br_multicast_disable_port(struct net_bridge_port *port)
500 {
501 }
502 
503 static inline void br_multicast_init(struct net_bridge *br)
504 {
505 }
506 
507 static inline void br_multicast_open(struct net_bridge *br)
508 {
509 }
510 
511 static inline void br_multicast_stop(struct net_bridge *br)
512 {
513 }
514 
515 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
516                                         struct sk_buff *skb)
517 {
518 }
519 
520 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
521                                         struct sk_buff *skb,
522                                         struct sk_buff *skb2)
523 {
524 }
525 static inline bool br_multicast_is_router(struct net_bridge *br)
526 {
527         return 0;
528 }
529 static inline void br_mdb_init(void)
530 {
531 }
532 static inline void br_mdb_uninit(void)
533 {
534 }
535 #endif
536 
537 /* br_netfilter.c */
538 #ifdef CONFIG_BRIDGE_NETFILTER
539 extern int br_netfilter_init(void);
540 extern void br_netfilter_fini(void);
541 extern void br_netfilter_rtable_init(struct net_bridge *);
542 #else
543 #define br_netfilter_init()     (0)
544 #define br_netfilter_fini()     do { } while(0)
545 #define br_netfilter_rtable_init(x)
546 #endif
547 
548 /* br_stp.c */
549 extern void br_log_state(const struct net_bridge_port *p);
550 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
551                                            u16 port_no);
552 extern void br_init_port(struct net_bridge_port *p);
553 extern void br_become_designated_port(struct net_bridge_port *p);
554 
555 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
556 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
557 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
558 
559 
560 /* br_stp_if.c */
561 extern void br_stp_enable_bridge(struct net_bridge *br);
562 extern void br_stp_disable_bridge(struct net_bridge *br);
563 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
564 extern void br_stp_enable_port(struct net_bridge_port *p);
565 extern void br_stp_disable_port(struct net_bridge_port *p);
566 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
567 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
568 extern void br_stp_set_bridge_priority(struct net_bridge *br,
569                                        u16 newprio);
570 extern int br_stp_set_port_priority(struct net_bridge_port *p,
571                                     unsigned long newprio);
572 extern int br_stp_set_path_cost(struct net_bridge_port *p,
573                                 unsigned long path_cost);
574 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
575 
576 /* br_stp_bpdu.c */
577 struct stp_proto;
578 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
579                        struct net_device *dev);
580 
581 /* br_stp_timer.c */
582 extern void br_stp_timer_init(struct net_bridge *br);
583 extern void br_stp_port_timer_init(struct net_bridge_port *p);
584 extern unsigned long br_timer_value(const struct timer_list *timer);
585 
586 /* br.c */
587 #if IS_ENABLED(CONFIG_ATM_LANE)
588 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
589 #endif
590 
591 /* br_netlink.c */
592 extern struct rtnl_link_ops br_link_ops;
593 extern int br_netlink_init(void);
594 extern void br_netlink_fini(void);
595 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
596 extern int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
597 extern int br_getlink(struct sk_buff *skb, u32 pid, u32 seq,
598                       struct net_device *dev);
599 
600 #ifdef CONFIG_SYSFS
601 /* br_sysfs_if.c */
602 extern const struct sysfs_ops brport_sysfs_ops;
603 extern int br_sysfs_addif(struct net_bridge_port *p);
604 extern int br_sysfs_renameif(struct net_bridge_port *p);
605 
606 /* br_sysfs_br.c */
607 extern int br_sysfs_addbr(struct net_device *dev);
608 extern void br_sysfs_delbr(struct net_device *dev);
609 
610 #else
611 
612 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
613 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
614 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
615 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
616 #endif /* CONFIG_SYSFS */
617 
618 #endif
619 

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