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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 #include <net/ip6_fib.h>
 22 #include <linux/if_vlan.h>
 23 #include <linux/rhashtable.h>
 24 
 25 #define BR_HASH_BITS 8
 26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
 27 
 28 #define BR_HOLD_TIME (1*HZ)
 29 
 30 #define BR_PORT_BITS    10
 31 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
 32 
 33 #define BR_VERSION      "2.3"
 34 
 35 /* Control of forwarding link local multicast */
 36 #define BR_GROUPFWD_DEFAULT     0
 37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
 38 #define BR_GROUPFWD_RESTRICTED  0x0007u
 39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
 40 #define BR_GROUPFWD_8021AD      0xB801u
 41 
 42 /* Path to usermode spanning tree program */
 43 #define BR_STP_PROG     "/sbin/bridge-stp"
 44 
 45 typedef struct bridge_id bridge_id;
 46 typedef struct mac_addr mac_addr;
 47 typedef __u16 port_id;
 48 
 49 struct bridge_id
 50 {
 51         unsigned char   prio[2];
 52         unsigned char   addr[ETH_ALEN];
 53 };
 54 
 55 struct mac_addr
 56 {
 57         unsigned char   addr[ETH_ALEN];
 58 };
 59 
 60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 61 /* our own querier */
 62 struct bridge_mcast_own_query {
 63         struct timer_list       timer;
 64         u32                     startup_sent;
 65 };
 66 
 67 /* other querier */
 68 struct bridge_mcast_other_query {
 69         struct timer_list               timer;
 70         unsigned long                   delay_time;
 71 };
 72 
 73 /* selected querier */
 74 struct bridge_mcast_querier {
 75         struct br_ip addr;
 76         struct net_bridge_port __rcu    *port;
 77 };
 78 #endif
 79 
 80 /**
 81  * struct net_bridge_vlan - per-vlan entry
 82  *
 83  * @vnode: rhashtable member
 84  * @vid: VLAN id
 85  * @flags: bridge vlan flags
 86  * @br: if MASTER flag set, this points to a bridge struct
 87  * @port: if MASTER flag unset, this points to a port struct
 88  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
 89  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
 90  *          for this VLAN entry
 91  * @vlist: sorted list of VLAN entries
 92  * @rcu: used for entry destruction
 93  *
 94  * This structure is shared between the global per-VLAN entries contained in
 95  * the bridge rhashtable and the local per-port per-VLAN entries contained in
 96  * the port's rhashtable. The union entries should be interpreted depending on
 97  * the entry flags that are set.
 98  */
 99 struct net_bridge_vlan {
100         struct rhash_head               vnode;
101         u16                             vid;
102         u16                             flags;
103         union {
104                 struct net_bridge       *br;
105                 struct net_bridge_port  *port;
106         };
107         union {
108                 atomic_t                refcnt;
109                 struct net_bridge_vlan  *brvlan;
110         };
111         struct list_head                vlist;
112 
113         struct rcu_head                 rcu;
114 };
115 
116 /**
117  * struct net_bridge_vlan_group
118  *
119  * @vlan_hash: VLAN entry rhashtable
120  * @vlan_list: sorted VLAN entry list
121  * @num_vlans: number of total VLAN entries
122  * @pvid: PVID VLAN id
123  *
124  * IMPORTANT: Be careful when checking if there're VLAN entries using list
125  *            primitives because the bridge can have entries in its list which
126  *            are just for global context but not for filtering, i.e. they have
127  *            the master flag set but not the brentry flag. If you have to check
128  *            if there're "real" entries in the bridge please test @num_vlans
129  */
130 struct net_bridge_vlan_group {
131         struct rhashtable               vlan_hash;
132         struct list_head                vlan_list;
133         u16                             num_vlans;
134         u16                             pvid;
135 };
136 
137 struct net_bridge_fdb_entry
138 {
139         struct hlist_node               hlist;
140         struct net_bridge_port          *dst;
141 
142         unsigned long                   updated;
143         unsigned long                   used;
144         mac_addr                        addr;
145         __u16                           vlan_id;
146         unsigned char                   is_local:1,
147                                         is_static:1,
148                                         added_by_user:1,
149                                         added_by_external_learn:1;
150         struct rcu_head                 rcu;
151 };
152 
153 struct net_bridge_port_group {
154         struct net_bridge_port          *port;
155         struct net_bridge_port_group __rcu *next;
156         struct hlist_node               mglist;
157         struct rcu_head                 rcu;
158         struct timer_list               timer;
159         struct br_ip                    addr;
160         unsigned char                   state;
161 };
162 
163 struct net_bridge_mdb_entry
164 {
165         struct hlist_node               hlist[2];
166         struct net_bridge               *br;
167         struct net_bridge_port_group __rcu *ports;
168         struct rcu_head                 rcu;
169         struct timer_list               timer;
170         struct br_ip                    addr;
171         bool                            mglist;
172 };
173 
174 struct net_bridge_mdb_htable
175 {
176         struct hlist_head               *mhash;
177         struct rcu_head                 rcu;
178         struct net_bridge_mdb_htable    *old;
179         u32                             size;
180         u32                             max;
181         u32                             secret;
182         u32                             ver;
183 };
184 
185 struct net_bridge_port
186 {
187         struct net_bridge               *br;
188         struct net_device               *dev;
189         struct list_head                list;
190 
191         /* STP */
192         u8                              priority;
193         u8                              state;
194         u16                             port_no;
195         unsigned char                   topology_change_ack;
196         unsigned char                   config_pending;
197         port_id                         port_id;
198         port_id                         designated_port;
199         bridge_id                       designated_root;
200         bridge_id                       designated_bridge;
201         u32                             path_cost;
202         u32                             designated_cost;
203         unsigned long                   designated_age;
204 
205         struct timer_list               forward_delay_timer;
206         struct timer_list               hold_timer;
207         struct timer_list               message_age_timer;
208         struct kobject                  kobj;
209         struct rcu_head                 rcu;
210 
211         unsigned long                   flags;
212 
213 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
214         struct bridge_mcast_own_query   ip4_own_query;
215 #if IS_ENABLED(CONFIG_IPV6)
216         struct bridge_mcast_own_query   ip6_own_query;
217 #endif /* IS_ENABLED(CONFIG_IPV6) */
218         unsigned char                   multicast_router;
219         struct timer_list               multicast_router_timer;
220         struct hlist_head               mglist;
221         struct hlist_node               rlist;
222 #endif
223 
224 #ifdef CONFIG_SYSFS
225         char                            sysfs_name[IFNAMSIZ];
226 #endif
227 
228 #ifdef CONFIG_NET_POLL_CONTROLLER
229         struct netpoll                  *np;
230 #endif
231 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
232         struct net_bridge_vlan_group    __rcu *vlgrp;
233 #endif
234 };
235 
236 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
237 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
238 
239 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
240 
241 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
242 {
243         return rcu_dereference(dev->rx_handler_data);
244 }
245 
246 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
247 {
248         return br_port_exists(dev) ?
249                 rtnl_dereference(dev->rx_handler_data) : NULL;
250 }
251 
252 struct net_bridge
253 {
254         spinlock_t                      lock;
255         struct list_head                port_list;
256         struct net_device               *dev;
257 
258         struct pcpu_sw_netstats         __percpu *stats;
259         spinlock_t                      hash_lock;
260         struct hlist_head               hash[BR_HASH_SIZE];
261 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
262         union {
263                 struct rtable           fake_rtable;
264                 struct rt6_info         fake_rt6_info;
265         };
266         bool                            nf_call_iptables;
267         bool                            nf_call_ip6tables;
268         bool                            nf_call_arptables;
269 #endif
270         u16                             group_fwd_mask;
271         u16                             group_fwd_mask_required;
272 
273         /* STP */
274         bridge_id                       designated_root;
275         bridge_id                       bridge_id;
276         u32                             root_path_cost;
277         unsigned long                   max_age;
278         unsigned long                   hello_time;
279         unsigned long                   forward_delay;
280         unsigned long                   bridge_max_age;
281         unsigned long                   ageing_time;
282         unsigned long                   bridge_hello_time;
283         unsigned long                   bridge_forward_delay;
284 
285         u8                              group_addr[ETH_ALEN];
286         bool                            group_addr_set;
287         u16                             root_port;
288 
289         enum {
290                 BR_NO_STP,              /* no spanning tree */
291                 BR_KERNEL_STP,          /* old STP in kernel */
292                 BR_USER_STP,            /* new RSTP in userspace */
293         } stp_enabled;
294 
295         unsigned char                   topology_change;
296         unsigned char                   topology_change_detected;
297 
298 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
299         unsigned char                   multicast_router;
300 
301         u8                              multicast_disabled:1;
302         u8                              multicast_querier:1;
303         u8                              multicast_query_use_ifaddr:1;
304 
305         u32                             hash_elasticity;
306         u32                             hash_max;
307 
308         u32                             multicast_last_member_count;
309         u32                             multicast_startup_query_count;
310 
311         unsigned long                   multicast_last_member_interval;
312         unsigned long                   multicast_membership_interval;
313         unsigned long                   multicast_querier_interval;
314         unsigned long                   multicast_query_interval;
315         unsigned long                   multicast_query_response_interval;
316         unsigned long                   multicast_startup_query_interval;
317 
318         spinlock_t                      multicast_lock;
319         struct net_bridge_mdb_htable __rcu *mdb;
320         struct hlist_head               router_list;
321 
322         struct timer_list               multicast_router_timer;
323         struct bridge_mcast_other_query ip4_other_query;
324         struct bridge_mcast_own_query   ip4_own_query;
325         struct bridge_mcast_querier     ip4_querier;
326 #if IS_ENABLED(CONFIG_IPV6)
327         struct bridge_mcast_other_query ip6_other_query;
328         struct bridge_mcast_own_query   ip6_own_query;
329         struct bridge_mcast_querier     ip6_querier;
330 #endif /* IS_ENABLED(CONFIG_IPV6) */
331 #endif
332 
333         struct timer_list               hello_timer;
334         struct timer_list               tcn_timer;
335         struct timer_list               topology_change_timer;
336         struct timer_list               gc_timer;
337         struct kobject                  *ifobj;
338         u32                             auto_cnt;
339 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
340         struct net_bridge_vlan_group    __rcu *vlgrp;
341         u8                              vlan_enabled;
342         __be16                          vlan_proto;
343         u16                             default_pvid;
344 #endif
345 };
346 
347 struct br_input_skb_cb {
348         struct net_device *brdev;
349 
350 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
351         int igmp;
352         int mrouters_only;
353 #endif
354 
355         bool proxyarp_replied;
356 
357 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
358         bool vlan_filtered;
359 #endif
360 };
361 
362 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
363 
364 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
365 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
366 #else
367 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
368 #endif
369 
370 #define br_printk(level, br, format, args...)   \
371         printk(level "%s: " format, (br)->dev->name, ##args)
372 
373 #define br_err(__br, format, args...)                   \
374         br_printk(KERN_ERR, __br, format, ##args)
375 #define br_warn(__br, format, args...)                  \
376         br_printk(KERN_WARNING, __br, format, ##args)
377 #define br_notice(__br, format, args...)                \
378         br_printk(KERN_NOTICE, __br, format, ##args)
379 #define br_info(__br, format, args...)                  \
380         br_printk(KERN_INFO, __br, format, ##args)
381 
382 #define br_debug(br, format, args...)                   \
383         pr_debug("%s: " format,  (br)->dev->name, ##args)
384 
385 /* called under bridge lock */
386 static inline int br_is_root_bridge(const struct net_bridge *br)
387 {
388         return !memcmp(&br->bridge_id, &br->designated_root, 8);
389 }
390 
391 /* check if a VLAN entry is global */
392 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
393 {
394         return v->flags & BRIDGE_VLAN_INFO_MASTER;
395 }
396 
397 /* check if a VLAN entry is used by the bridge */
398 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
399 {
400         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
401 }
402 
403 /* check if we should use the vlan entry, returns false if it's only context */
404 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
405 {
406         if (br_vlan_is_master(v)) {
407                 if (br_vlan_is_brentry(v))
408                         return true;
409                 else
410                         return false;
411         }
412 
413         return true;
414 }
415 
416 /* br_device.c */
417 void br_dev_setup(struct net_device *dev);
418 void br_dev_delete(struct net_device *dev, struct list_head *list);
419 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
420 #ifdef CONFIG_NET_POLL_CONTROLLER
421 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
422                                        struct sk_buff *skb)
423 {
424         struct netpoll *np = p->np;
425 
426         if (np)
427                 netpoll_send_skb(np, skb);
428 }
429 
430 int br_netpoll_enable(struct net_bridge_port *p);
431 void br_netpoll_disable(struct net_bridge_port *p);
432 #else
433 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
434                                        struct sk_buff *skb)
435 {
436 }
437 
438 static inline int br_netpoll_enable(struct net_bridge_port *p)
439 {
440         return 0;
441 }
442 
443 static inline void br_netpoll_disable(struct net_bridge_port *p)
444 {
445 }
446 #endif
447 
448 /* br_fdb.c */
449 int br_fdb_init(void);
450 void br_fdb_fini(void);
451 void br_fdb_flush(struct net_bridge *br);
452 void br_fdb_find_delete_local(struct net_bridge *br,
453                               const struct net_bridge_port *p,
454                               const unsigned char *addr, u16 vid);
455 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
456 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
457 void br_fdb_cleanup(unsigned long arg);
458 void br_fdb_delete_by_port(struct net_bridge *br,
459                            const struct net_bridge_port *p, u16 vid, int do_all);
460 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
461                                           const unsigned char *addr, __u16 vid);
462 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
463 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
464                    unsigned long off);
465 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
466                   const unsigned char *addr, u16 vid);
467 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
468                    const unsigned char *addr, u16 vid, bool added_by_user);
469 
470 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
471                   struct net_device *dev, const unsigned char *addr, u16 vid);
472 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
473                const unsigned char *addr, u16 vid, u16 nlh_flags);
474 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
475                 struct net_device *dev, struct net_device *fdev, int idx);
476 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
477 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
478 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
479                               const unsigned char *addr, u16 vid);
480 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
481                               const unsigned char *addr, u16 vid);
482 
483 /* br_forward.c */
484 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
485 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
486 void br_forward(const struct net_bridge_port *to,
487                 struct sk_buff *skb, struct sk_buff *skb0);
488 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
489 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
490 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
491                       struct sk_buff *skb2, bool unicast);
492 
493 /* br_if.c */
494 void br_port_carrier_check(struct net_bridge_port *p);
495 int br_add_bridge(struct net *net, const char *name);
496 int br_del_bridge(struct net *net, const char *name);
497 int br_add_if(struct net_bridge *br, struct net_device *dev);
498 int br_del_if(struct net_bridge *br, struct net_device *dev);
499 int br_min_mtu(const struct net_bridge *br);
500 netdev_features_t br_features_recompute(struct net_bridge *br,
501                                         netdev_features_t features);
502 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
503 void br_manage_promisc(struct net_bridge *br);
504 
505 /* br_input.c */
506 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
507 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
508 
509 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
510 {
511         return rcu_dereference(dev->rx_handler) == br_handle_frame;
512 }
513 
514 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
515 {
516         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
517 }
518 
519 /* br_ioctl.c */
520 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
521 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
522                              void __user *arg);
523 
524 /* br_multicast.c */
525 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
526 extern unsigned int br_mdb_rehash_seq;
527 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
528                      struct sk_buff *skb, u16 vid);
529 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
530                                         struct sk_buff *skb, u16 vid);
531 void br_multicast_add_port(struct net_bridge_port *port);
532 void br_multicast_del_port(struct net_bridge_port *port);
533 void br_multicast_enable_port(struct net_bridge_port *port);
534 void br_multicast_disable_port(struct net_bridge_port *port);
535 void br_multicast_init(struct net_bridge *br);
536 void br_multicast_open(struct net_bridge *br);
537 void br_multicast_stop(struct net_bridge *br);
538 void br_multicast_dev_del(struct net_bridge *br);
539 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
540                           struct sk_buff *skb);
541 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
542                           struct sk_buff *skb, struct sk_buff *skb2);
543 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
544 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
545 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
546 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
547 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
548 struct net_bridge_mdb_entry *
549 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
550 struct net_bridge_mdb_entry *
551 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
552                        struct br_ip *group);
553 void br_multicast_free_pg(struct rcu_head *head);
554 struct net_bridge_port_group *
555 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
556                             struct net_bridge_port_group __rcu *next,
557                             unsigned char state);
558 void br_mdb_init(void);
559 void br_mdb_uninit(void);
560 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
561                    struct br_ip *group, int type, u8 state);
562 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
563                    int type);
564 
565 #define mlock_dereference(X, br) \
566         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
567 
568 static inline bool br_multicast_is_router(struct net_bridge *br)
569 {
570         return br->multicast_router == 2 ||
571                (br->multicast_router == 1 &&
572                 timer_pending(&br->multicast_router_timer));
573 }
574 
575 static inline bool
576 __br_multicast_querier_exists(struct net_bridge *br,
577                               struct bridge_mcast_other_query *querier)
578 {
579         return time_is_before_jiffies(querier->delay_time) &&
580                (br->multicast_querier || timer_pending(&querier->timer));
581 }
582 
583 static inline bool br_multicast_querier_exists(struct net_bridge *br,
584                                                struct ethhdr *eth)
585 {
586         switch (eth->h_proto) {
587         case (htons(ETH_P_IP)):
588                 return __br_multicast_querier_exists(br, &br->ip4_other_query);
589 #if IS_ENABLED(CONFIG_IPV6)
590         case (htons(ETH_P_IPV6)):
591                 return __br_multicast_querier_exists(br, &br->ip6_other_query);
592 #endif
593         default:
594                 return false;
595         }
596 }
597 #else
598 static inline int br_multicast_rcv(struct net_bridge *br,
599                                    struct net_bridge_port *port,
600                                    struct sk_buff *skb,
601                                    u16 vid)
602 {
603         return 0;
604 }
605 
606 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
607                                                       struct sk_buff *skb, u16 vid)
608 {
609         return NULL;
610 }
611 
612 static inline void br_multicast_add_port(struct net_bridge_port *port)
613 {
614 }
615 
616 static inline void br_multicast_del_port(struct net_bridge_port *port)
617 {
618 }
619 
620 static inline void br_multicast_enable_port(struct net_bridge_port *port)
621 {
622 }
623 
624 static inline void br_multicast_disable_port(struct net_bridge_port *port)
625 {
626 }
627 
628 static inline void br_multicast_init(struct net_bridge *br)
629 {
630 }
631 
632 static inline void br_multicast_open(struct net_bridge *br)
633 {
634 }
635 
636 static inline void br_multicast_stop(struct net_bridge *br)
637 {
638 }
639 
640 static inline void br_multicast_dev_del(struct net_bridge *br)
641 {
642 }
643 
644 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
645                                         struct sk_buff *skb)
646 {
647 }
648 
649 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
650                                         struct sk_buff *skb,
651                                         struct sk_buff *skb2)
652 {
653 }
654 static inline bool br_multicast_is_router(struct net_bridge *br)
655 {
656         return 0;
657 }
658 static inline bool br_multicast_querier_exists(struct net_bridge *br,
659                                                struct ethhdr *eth)
660 {
661         return false;
662 }
663 static inline void br_mdb_init(void)
664 {
665 }
666 static inline void br_mdb_uninit(void)
667 {
668 }
669 #endif
670 
671 /* br_vlan.c */
672 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
673 bool br_allowed_ingress(const struct net_bridge *br,
674                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
675                         u16 *vid);
676 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
677                        const struct sk_buff *skb);
678 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
679 struct sk_buff *br_handle_vlan(struct net_bridge *br,
680                                struct net_bridge_vlan_group *vg,
681                                struct sk_buff *skb);
682 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
683 int br_vlan_delete(struct net_bridge *br, u16 vid);
684 void br_vlan_flush(struct net_bridge *br);
685 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
686 void br_recalculate_fwd_mask(struct net_bridge *br);
687 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
688 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
689 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
690 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
691 int br_vlan_init(struct net_bridge *br);
692 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
693 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
694 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
695 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
696 void nbp_vlan_flush(struct net_bridge_port *port);
697 int nbp_vlan_init(struct net_bridge_port *port);
698 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
699 
700 static inline struct net_bridge_vlan_group *br_vlan_group(
701                                         const struct net_bridge *br)
702 {
703         return rtnl_dereference(br->vlgrp);
704 }
705 
706 static inline struct net_bridge_vlan_group *nbp_vlan_group(
707                                         const struct net_bridge_port *p)
708 {
709         return rtnl_dereference(p->vlgrp);
710 }
711 
712 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
713                                         const struct net_bridge *br)
714 {
715         return rcu_dereference(br->vlgrp);
716 }
717 
718 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
719                                         const struct net_bridge_port *p)
720 {
721         return rcu_dereference(p->vlgrp);
722 }
723 
724 /* Since bridge now depends on 8021Q module, but the time bridge sees the
725  * skb, the vlan tag will always be present if the frame was tagged.
726  */
727 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
728 {
729         int err = 0;
730 
731         if (skb_vlan_tag_present(skb)) {
732                 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
733         } else {
734                 *vid = 0;
735                 err = -EINVAL;
736         }
737 
738         return err;
739 }
740 
741 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
742 {
743         if (!vg)
744                 return 0;
745 
746         smp_rmb();
747         return vg->pvid;
748 }
749 
750 static inline int br_vlan_enabled(struct net_bridge *br)
751 {
752         return br->vlan_enabled;
753 }
754 #else
755 static inline bool br_allowed_ingress(const struct net_bridge *br,
756                                       struct net_bridge_vlan_group *vg,
757                                       struct sk_buff *skb,
758                                       u16 *vid)
759 {
760         return true;
761 }
762 
763 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
764                                      const struct sk_buff *skb)
765 {
766         return true;
767 }
768 
769 static inline bool br_should_learn(struct net_bridge_port *p,
770                                    struct sk_buff *skb, u16 *vid)
771 {
772         return true;
773 }
774 
775 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
776                                              struct net_bridge_vlan_group *vg,
777                                              struct sk_buff *skb)
778 {
779         return skb;
780 }
781 
782 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
783 {
784         return -EOPNOTSUPP;
785 }
786 
787 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
788 {
789         return -EOPNOTSUPP;
790 }
791 
792 static inline void br_vlan_flush(struct net_bridge *br)
793 {
794 }
795 
796 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
797 {
798 }
799 
800 static inline int br_vlan_init(struct net_bridge *br)
801 {
802         return 0;
803 }
804 
805 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
806 {
807         return -EOPNOTSUPP;
808 }
809 
810 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
811 {
812         return -EOPNOTSUPP;
813 }
814 
815 static inline void nbp_vlan_flush(struct net_bridge_port *port)
816 {
817 }
818 
819 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
820                                                    u16 vid)
821 {
822         return NULL;
823 }
824 
825 static inline int nbp_vlan_init(struct net_bridge_port *port)
826 {
827         return 0;
828 }
829 
830 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
831 {
832         return 0;
833 }
834 
835 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
836 {
837         return 0;
838 }
839 
840 static inline int br_vlan_enabled(struct net_bridge *br)
841 {
842         return 0;
843 }
844 
845 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
846                                           unsigned long val)
847 {
848         return -EOPNOTSUPP;
849 }
850 
851 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
852                                          u32 filter_mask)
853 {
854         return 0;
855 }
856 
857 static inline struct net_bridge_vlan_group *br_vlan_group(
858                                         const struct net_bridge *br)
859 {
860         return NULL;
861 }
862 
863 static inline struct net_bridge_vlan_group *nbp_vlan_group(
864                                         const struct net_bridge_port *p)
865 {
866         return NULL;
867 }
868 
869 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
870                                         const struct net_bridge *br)
871 {
872         return NULL;
873 }
874 
875 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
876                                         const struct net_bridge_port *p)
877 {
878         return NULL;
879 }
880 
881 #endif
882 
883 struct nf_br_ops {
884         int (*br_dev_xmit_hook)(struct sk_buff *skb);
885 };
886 extern const struct nf_br_ops __rcu *nf_br_ops;
887 
888 /* br_netfilter.c */
889 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
890 int br_nf_core_init(void);
891 void br_nf_core_fini(void);
892 void br_netfilter_rtable_init(struct net_bridge *);
893 #else
894 static inline int br_nf_core_init(void) { return 0; }
895 static inline void br_nf_core_fini(void) {}
896 #define br_netfilter_rtable_init(x)
897 #endif
898 
899 /* br_stp.c */
900 void br_log_state(const struct net_bridge_port *p);
901 void br_set_state(struct net_bridge_port *p, unsigned int state);
902 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
903 void br_init_port(struct net_bridge_port *p);
904 void br_become_designated_port(struct net_bridge_port *p);
905 
906 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
907 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
908 int br_set_hello_time(struct net_bridge *br, unsigned long x);
909 int br_set_max_age(struct net_bridge *br, unsigned long x);
910 int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
911 
912 
913 /* br_stp_if.c */
914 void br_stp_enable_bridge(struct net_bridge *br);
915 void br_stp_disable_bridge(struct net_bridge *br);
916 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
917 void br_stp_enable_port(struct net_bridge_port *p);
918 void br_stp_disable_port(struct net_bridge_port *p);
919 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
920 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
921 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
922 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
923 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
924 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
925 
926 /* br_stp_bpdu.c */
927 struct stp_proto;
928 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
929                 struct net_device *dev);
930 
931 /* br_stp_timer.c */
932 void br_stp_timer_init(struct net_bridge *br);
933 void br_stp_port_timer_init(struct net_bridge_port *p);
934 unsigned long br_timer_value(const struct timer_list *timer);
935 
936 /* br.c */
937 #if IS_ENABLED(CONFIG_ATM_LANE)
938 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
939 #endif
940 
941 /* br_netlink.c */
942 extern struct rtnl_link_ops br_link_ops;
943 int br_netlink_init(void);
944 void br_netlink_fini(void);
945 void br_ifinfo_notify(int event, struct net_bridge_port *port);
946 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
947 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
948 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
949                u32 filter_mask, int nlflags);
950 
951 #ifdef CONFIG_SYSFS
952 /* br_sysfs_if.c */
953 extern const struct sysfs_ops brport_sysfs_ops;
954 int br_sysfs_addif(struct net_bridge_port *p);
955 int br_sysfs_renameif(struct net_bridge_port *p);
956 
957 /* br_sysfs_br.c */
958 int br_sysfs_addbr(struct net_device *dev);
959 void br_sysfs_delbr(struct net_device *dev);
960 
961 #else
962 
963 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
964 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
965 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
966 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
967 #endif /* CONFIG_SYSFS */
968 
969 #endif
970 

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