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

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  1 /* SPDX-License-Identifier: GPL-2.0-or-later */
  2 /*
  3  *      Linux ethernet bridge
  4  *
  5  *      Authors:
  6  *      Lennert Buytenhek               <buytenh@gnu.org>
  7  */
  8 
  9 #ifndef _BR_PRIVATE_H
 10 #define _BR_PRIVATE_H
 11 
 12 #include <linux/netdevice.h>
 13 #include <linux/if_bridge.h>
 14 #include <linux/netpoll.h>
 15 #include <linux/u64_stats_sync.h>
 16 #include <net/route.h>
 17 #include <net/ip6_fib.h>
 18 #include <linux/if_vlan.h>
 19 #include <linux/rhashtable.h>
 20 #include <linux/refcount.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_MULTICAST_DEFAULT_HASH_MAX 4096
 31 
 32 #define BR_VERSION      "2.3"
 33 
 34 /* Control of forwarding link local multicast */
 35 #define BR_GROUPFWD_DEFAULT     0
 36 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
 37 enum {
 38         BR_GROUPFWD_STP         = BIT(0),
 39         BR_GROUPFWD_MACPAUSE    = BIT(1),
 40         BR_GROUPFWD_LACP        = BIT(2),
 41 };
 42 
 43 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
 44                                 BR_GROUPFWD_LACP)
 45 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
 46 #define BR_GROUPFWD_8021AD      0xB801u
 47 
 48 /* Path to usermode spanning tree program */
 49 #define BR_STP_PROG     "/sbin/bridge-stp"
 50 
 51 typedef struct bridge_id bridge_id;
 52 typedef struct mac_addr mac_addr;
 53 typedef __u16 port_id;
 54 
 55 struct bridge_id {
 56         unsigned char   prio[2];
 57         unsigned char   addr[ETH_ALEN];
 58 };
 59 
 60 struct mac_addr {
 61         unsigned char   addr[ETH_ALEN];
 62 };
 63 
 64 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 65 /* our own querier */
 66 struct bridge_mcast_own_query {
 67         struct timer_list       timer;
 68         u32                     startup_sent;
 69 };
 70 
 71 /* other querier */
 72 struct bridge_mcast_other_query {
 73         struct timer_list               timer;
 74         unsigned long                   delay_time;
 75 };
 76 
 77 /* selected querier */
 78 struct bridge_mcast_querier {
 79         struct br_ip addr;
 80         struct net_bridge_port __rcu    *port;
 81 };
 82 
 83 /* IGMP/MLD statistics */
 84 struct bridge_mcast_stats {
 85         struct br_mcast_stats mstats;
 86         struct u64_stats_sync syncp;
 87 };
 88 #endif
 89 
 90 struct br_vlan_stats {
 91         u64 rx_bytes;
 92         u64 rx_packets;
 93         u64 tx_bytes;
 94         u64 tx_packets;
 95         struct u64_stats_sync syncp;
 96 };
 97 
 98 struct br_tunnel_info {
 99         __be64                  tunnel_id;
100         struct metadata_dst     *tunnel_dst;
101 };
102 
103 /* private vlan flags */
104 enum {
105         BR_VLFLAG_PER_PORT_STATS = BIT(0),
106         BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
107 };
108 
109 /**
110  * struct net_bridge_vlan - per-vlan entry
111  *
112  * @vnode: rhashtable member
113  * @vid: VLAN id
114  * @flags: bridge vlan flags
115  * @priv_flags: private (in-kernel) bridge vlan flags
116  * @stats: per-cpu VLAN statistics
117  * @br: if MASTER flag set, this points to a bridge struct
118  * @port: if MASTER flag unset, this points to a port struct
119  * @refcnt: if MASTER flag set, this is bumped for each port referencing it
120  * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
121  *          for this VLAN entry
122  * @vlist: sorted list of VLAN entries
123  * @rcu: used for entry destruction
124  *
125  * This structure is shared between the global per-VLAN entries contained in
126  * the bridge rhashtable and the local per-port per-VLAN entries contained in
127  * the port's rhashtable. The union entries should be interpreted depending on
128  * the entry flags that are set.
129  */
130 struct net_bridge_vlan {
131         struct rhash_head               vnode;
132         struct rhash_head               tnode;
133         u16                             vid;
134         u16                             flags;
135         u16                             priv_flags;
136         struct br_vlan_stats __percpu   *stats;
137         union {
138                 struct net_bridge       *br;
139                 struct net_bridge_port  *port;
140         };
141         union {
142                 refcount_t              refcnt;
143                 struct net_bridge_vlan  *brvlan;
144         };
145 
146         struct br_tunnel_info           tinfo;
147 
148         struct list_head                vlist;
149 
150         struct rcu_head                 rcu;
151 };
152 
153 /**
154  * struct net_bridge_vlan_group
155  *
156  * @vlan_hash: VLAN entry rhashtable
157  * @vlan_list: sorted VLAN entry list
158  * @num_vlans: number of total VLAN entries
159  * @pvid: PVID VLAN id
160  *
161  * IMPORTANT: Be careful when checking if there're VLAN entries using list
162  *            primitives because the bridge can have entries in its list which
163  *            are just for global context but not for filtering, i.e. they have
164  *            the master flag set but not the brentry flag. If you have to check
165  *            if there're "real" entries in the bridge please test @num_vlans
166  */
167 struct net_bridge_vlan_group {
168         struct rhashtable               vlan_hash;
169         struct rhashtable               tunnel_hash;
170         struct list_head                vlan_list;
171         u16                             num_vlans;
172         u16                             pvid;
173 };
174 
175 struct net_bridge_fdb_key {
176         mac_addr addr;
177         u16 vlan_id;
178 };
179 
180 struct net_bridge_fdb_entry {
181         struct rhash_head               rhnode;
182         struct net_bridge_port          *dst;
183 
184         struct net_bridge_fdb_key       key;
185         struct hlist_node               fdb_node;
186         unsigned char                   is_local:1,
187                                         is_static:1,
188                                         is_sticky:1,
189                                         added_by_user:1,
190                                         added_by_external_learn:1,
191                                         offloaded:1;
192 
193         /* write-heavy members should not affect lookups */
194         unsigned long                   updated ____cacheline_aligned_in_smp;
195         unsigned long                   used;
196 
197         struct rcu_head                 rcu;
198 };
199 
200 #define MDB_PG_FLAGS_PERMANENT  BIT(0)
201 #define MDB_PG_FLAGS_OFFLOAD    BIT(1)
202 
203 struct net_bridge_port_group {
204         struct net_bridge_port          *port;
205         struct net_bridge_port_group __rcu *next;
206         struct hlist_node               mglist;
207         struct rcu_head                 rcu;
208         struct timer_list               timer;
209         struct br_ip                    addr;
210         unsigned char                   flags;
211         unsigned char                   eth_addr[ETH_ALEN];
212 };
213 
214 struct net_bridge_mdb_entry {
215         struct rhash_head               rhnode;
216         struct net_bridge               *br;
217         struct net_bridge_port_group __rcu *ports;
218         struct rcu_head                 rcu;
219         struct timer_list               timer;
220         struct br_ip                    addr;
221         bool                            host_joined;
222         struct hlist_node               mdb_node;
223 };
224 
225 struct net_bridge_port {
226         struct net_bridge               *br;
227         struct net_device               *dev;
228         struct list_head                list;
229 
230         unsigned long                   flags;
231 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
232         struct net_bridge_vlan_group    __rcu *vlgrp;
233 #endif
234         struct net_bridge_port          __rcu *backup_port;
235 
236         /* STP */
237         u8                              priority;
238         u8                              state;
239         u16                             port_no;
240         unsigned char                   topology_change_ack;
241         unsigned char                   config_pending;
242         port_id                         port_id;
243         port_id                         designated_port;
244         bridge_id                       designated_root;
245         bridge_id                       designated_bridge;
246         u32                             path_cost;
247         u32                             designated_cost;
248         unsigned long                   designated_age;
249 
250         struct timer_list               forward_delay_timer;
251         struct timer_list               hold_timer;
252         struct timer_list               message_age_timer;
253         struct kobject                  kobj;
254         struct rcu_head                 rcu;
255 
256 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
257         struct bridge_mcast_own_query   ip4_own_query;
258 #if IS_ENABLED(CONFIG_IPV6)
259         struct bridge_mcast_own_query   ip6_own_query;
260 #endif /* IS_ENABLED(CONFIG_IPV6) */
261         unsigned char                   multicast_router;
262         struct bridge_mcast_stats       __percpu *mcast_stats;
263         struct timer_list               multicast_router_timer;
264         struct hlist_head               mglist;
265         struct hlist_node               rlist;
266 #endif
267 
268 #ifdef CONFIG_SYSFS
269         char                            sysfs_name[IFNAMSIZ];
270 #endif
271 
272 #ifdef CONFIG_NET_POLL_CONTROLLER
273         struct netpoll                  *np;
274 #endif
275 #ifdef CONFIG_NET_SWITCHDEV
276         int                             offload_fwd_mark;
277 #endif
278         u16                             group_fwd_mask;
279         u16                             backup_redirected_cnt;
280 };
281 
282 #define kobj_to_brport(obj)     container_of(obj, struct net_bridge_port, kobj)
283 
284 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
285 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
286 
287 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
288 {
289         return rcu_dereference(dev->rx_handler_data);
290 }
291 
292 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
293 {
294         return netif_is_bridge_port(dev) ?
295                 rtnl_dereference(dev->rx_handler_data) : NULL;
296 }
297 
298 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
299 {
300         return netif_is_bridge_port(dev) ?
301                 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
302 }
303 
304 enum net_bridge_opts {
305         BROPT_VLAN_ENABLED,
306         BROPT_VLAN_STATS_ENABLED,
307         BROPT_NF_CALL_IPTABLES,
308         BROPT_NF_CALL_IP6TABLES,
309         BROPT_NF_CALL_ARPTABLES,
310         BROPT_GROUP_ADDR_SET,
311         BROPT_MULTICAST_ENABLED,
312         BROPT_MULTICAST_QUERIER,
313         BROPT_MULTICAST_QUERY_USE_IFADDR,
314         BROPT_MULTICAST_STATS_ENABLED,
315         BROPT_HAS_IPV6_ADDR,
316         BROPT_NEIGH_SUPPRESS_ENABLED,
317         BROPT_MTU_SET_BY_USER,
318         BROPT_VLAN_STATS_PER_PORT,
319         BROPT_NO_LL_LEARN,
320         BROPT_VLAN_BRIDGE_BINDING,
321 };
322 
323 struct net_bridge {
324         spinlock_t                      lock;
325         spinlock_t                      hash_lock;
326         struct list_head                port_list;
327         struct net_device               *dev;
328         struct pcpu_sw_netstats         __percpu *stats;
329         unsigned long                   options;
330         /* These fields are accessed on each packet */
331 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
332         __be16                          vlan_proto;
333         u16                             default_pvid;
334         struct net_bridge_vlan_group    __rcu *vlgrp;
335 #endif
336 
337         struct rhashtable               fdb_hash_tbl;
338 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
339         union {
340                 struct rtable           fake_rtable;
341                 struct rt6_info         fake_rt6_info;
342         };
343 #endif
344         u16                             group_fwd_mask;
345         u16                             group_fwd_mask_required;
346 
347         /* STP */
348         bridge_id                       designated_root;
349         bridge_id                       bridge_id;
350         unsigned char                   topology_change;
351         unsigned char                   topology_change_detected;
352         u16                             root_port;
353         unsigned long                   max_age;
354         unsigned long                   hello_time;
355         unsigned long                   forward_delay;
356         unsigned long                   ageing_time;
357         unsigned long                   bridge_max_age;
358         unsigned long                   bridge_hello_time;
359         unsigned long                   bridge_forward_delay;
360         unsigned long                   bridge_ageing_time;
361         u32                             root_path_cost;
362 
363         u8                              group_addr[ETH_ALEN];
364 
365         enum {
366                 BR_NO_STP,              /* no spanning tree */
367                 BR_KERNEL_STP,          /* old STP in kernel */
368                 BR_USER_STP,            /* new RSTP in userspace */
369         } stp_enabled;
370 
371 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
372 
373         u32                             hash_max;
374 
375         u32                             multicast_last_member_count;
376         u32                             multicast_startup_query_count;
377 
378         u8                              multicast_igmp_version;
379         u8                              multicast_router;
380 #if IS_ENABLED(CONFIG_IPV6)
381         u8                              multicast_mld_version;
382 #endif
383         spinlock_t                      multicast_lock;
384         unsigned long                   multicast_last_member_interval;
385         unsigned long                   multicast_membership_interval;
386         unsigned long                   multicast_querier_interval;
387         unsigned long                   multicast_query_interval;
388         unsigned long                   multicast_query_response_interval;
389         unsigned long                   multicast_startup_query_interval;
390 
391         struct rhashtable               mdb_hash_tbl;
392 
393         struct hlist_head               mdb_list;
394         struct hlist_head               router_list;
395 
396         struct timer_list               multicast_router_timer;
397         struct bridge_mcast_other_query ip4_other_query;
398         struct bridge_mcast_own_query   ip4_own_query;
399         struct bridge_mcast_querier     ip4_querier;
400         struct bridge_mcast_stats       __percpu *mcast_stats;
401 #if IS_ENABLED(CONFIG_IPV6)
402         struct bridge_mcast_other_query ip6_other_query;
403         struct bridge_mcast_own_query   ip6_own_query;
404         struct bridge_mcast_querier     ip6_querier;
405 #endif /* IS_ENABLED(CONFIG_IPV6) */
406 #endif
407 
408         struct timer_list               hello_timer;
409         struct timer_list               tcn_timer;
410         struct timer_list               topology_change_timer;
411         struct delayed_work             gc_work;
412         struct kobject                  *ifobj;
413         u32                             auto_cnt;
414 
415 #ifdef CONFIG_NET_SWITCHDEV
416         int offload_fwd_mark;
417 #endif
418         struct hlist_head               fdb_list;
419 };
420 
421 struct br_input_skb_cb {
422         struct net_device *brdev;
423 
424         u16 frag_max_size;
425 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
426         u8 igmp;
427         u8 mrouters_only:1;
428 #endif
429         u8 proxyarp_replied:1;
430         u8 src_port_isolated:1;
431 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
432         u8 vlan_filtered:1;
433 #endif
434 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
435         u8 br_netfilter_broute:1;
436 #endif
437 
438 #ifdef CONFIG_NET_SWITCHDEV
439         int offload_fwd_mark;
440 #endif
441 };
442 
443 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
444 
445 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
446 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (BR_INPUT_SKB_CB(__skb)->mrouters_only)
447 #else
448 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)   (0)
449 #endif
450 
451 #define br_printk(level, br, format, args...)   \
452         printk(level "%s: " format, (br)->dev->name, ##args)
453 
454 #define br_err(__br, format, args...)                   \
455         br_printk(KERN_ERR, __br, format, ##args)
456 #define br_warn(__br, format, args...)                  \
457         br_printk(KERN_WARNING, __br, format, ##args)
458 #define br_notice(__br, format, args...)                \
459         br_printk(KERN_NOTICE, __br, format, ##args)
460 #define br_info(__br, format, args...)                  \
461         br_printk(KERN_INFO, __br, format, ##args)
462 
463 #define br_debug(br, format, args...)                   \
464         pr_debug("%s: " format,  (br)->dev->name, ##args)
465 
466 /* called under bridge lock */
467 static inline int br_is_root_bridge(const struct net_bridge *br)
468 {
469         return !memcmp(&br->bridge_id, &br->designated_root, 8);
470 }
471 
472 /* check if a VLAN entry is global */
473 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
474 {
475         return v->flags & BRIDGE_VLAN_INFO_MASTER;
476 }
477 
478 /* check if a VLAN entry is used by the bridge */
479 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
480 {
481         return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
482 }
483 
484 /* check if we should use the vlan entry, returns false if it's only context */
485 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
486 {
487         if (br_vlan_is_master(v)) {
488                 if (br_vlan_is_brentry(v))
489                         return true;
490                 else
491                         return false;
492         }
493 
494         return true;
495 }
496 
497 static inline int br_opt_get(const struct net_bridge *br,
498                              enum net_bridge_opts opt)
499 {
500         return test_bit(opt, &br->options);
501 }
502 
503 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
504                       struct netlink_ext_ack *extack);
505 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
506 int br_boolopt_multi_toggle(struct net_bridge *br,
507                             struct br_boolopt_multi *bm,
508                             struct netlink_ext_ack *extack);
509 void br_boolopt_multi_get(const struct net_bridge *br,
510                           struct br_boolopt_multi *bm);
511 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
512 
513 /* br_device.c */
514 void br_dev_setup(struct net_device *dev);
515 void br_dev_delete(struct net_device *dev, struct list_head *list);
516 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
517 #ifdef CONFIG_NET_POLL_CONTROLLER
518 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
519                                        struct sk_buff *skb)
520 {
521         struct netpoll *np = p->np;
522 
523         if (np)
524                 netpoll_send_skb(np, skb);
525 }
526 
527 int br_netpoll_enable(struct net_bridge_port *p);
528 void br_netpoll_disable(struct net_bridge_port *p);
529 #else
530 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
531                                        struct sk_buff *skb)
532 {
533 }
534 
535 static inline int br_netpoll_enable(struct net_bridge_port *p)
536 {
537         return 0;
538 }
539 
540 static inline void br_netpoll_disable(struct net_bridge_port *p)
541 {
542 }
543 #endif
544 
545 /* br_fdb.c */
546 int br_fdb_init(void);
547 void br_fdb_fini(void);
548 int br_fdb_hash_init(struct net_bridge *br);
549 void br_fdb_hash_fini(struct net_bridge *br);
550 void br_fdb_flush(struct net_bridge *br);
551 void br_fdb_find_delete_local(struct net_bridge *br,
552                               const struct net_bridge_port *p,
553                               const unsigned char *addr, u16 vid);
554 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
555 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
556 void br_fdb_cleanup(struct work_struct *work);
557 void br_fdb_delete_by_port(struct net_bridge *br,
558                            const struct net_bridge_port *p, u16 vid, int do_all);
559 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
560                                              const unsigned char *addr,
561                                              __u16 vid);
562 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
563 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
564                    unsigned long off);
565 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
566                   const unsigned char *addr, u16 vid);
567 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
568                    const unsigned char *addr, u16 vid, bool added_by_user);
569 
570 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
571                   struct net_device *dev, const unsigned char *addr, u16 vid);
572 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
573                const unsigned char *addr, u16 vid, u16 nlh_flags,
574                struct netlink_ext_ack *extack);
575 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
576                 struct net_device *dev, struct net_device *fdev, int *idx);
577 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
578                const unsigned char *addr, u16 vid, u32 portid, u32 seq,
579                struct netlink_ext_ack *extack);
580 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
581 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
582 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
583                               const unsigned char *addr, u16 vid,
584                               bool swdev_notify);
585 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
586                               const unsigned char *addr, u16 vid,
587                               bool swdev_notify);
588 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
589                           const unsigned char *addr, u16 vid, bool offloaded);
590 
591 /* br_forward.c */
592 enum br_pkt_type {
593         BR_PKT_UNICAST,
594         BR_PKT_MULTICAST,
595         BR_PKT_BROADCAST
596 };
597 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
598 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
599                 bool local_rcv, bool local_orig);
600 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
601 void br_flood(struct net_bridge *br, struct sk_buff *skb,
602               enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
603 
604 /* return true if both source port and dest port are isolated */
605 static inline bool br_skb_isolated(const struct net_bridge_port *to,
606                                    const struct sk_buff *skb)
607 {
608         return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
609                (to->flags & BR_ISOLATED);
610 }
611 
612 /* br_if.c */
613 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
614 int br_add_bridge(struct net *net, const char *name);
615 int br_del_bridge(struct net *net, const char *name);
616 int br_add_if(struct net_bridge *br, struct net_device *dev,
617               struct netlink_ext_ack *extack);
618 int br_del_if(struct net_bridge *br, struct net_device *dev);
619 void br_mtu_auto_adjust(struct net_bridge *br);
620 netdev_features_t br_features_recompute(struct net_bridge *br,
621                                         netdev_features_t features);
622 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
623 void br_manage_promisc(struct net_bridge *br);
624 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
625 
626 /* br_input.c */
627 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
628 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
629 
630 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
631 {
632         return rcu_dereference(dev->rx_handler) == br_handle_frame;
633 }
634 
635 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
636 {
637         return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
638 }
639 
640 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
641 {
642         return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
643 }
644 
645 static inline struct net_bridge_port *
646 br_port_get_check_rtnl(const struct net_device *dev)
647 {
648         return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
649 }
650 
651 /* br_ioctl.c */
652 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
653 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
654                              void __user *arg);
655 
656 /* br_multicast.c */
657 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
658 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
659                      struct sk_buff *skb, u16 vid);
660 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
661                                         struct sk_buff *skb, u16 vid);
662 int br_multicast_add_port(struct net_bridge_port *port);
663 void br_multicast_del_port(struct net_bridge_port *port);
664 void br_multicast_enable_port(struct net_bridge_port *port);
665 void br_multicast_disable_port(struct net_bridge_port *port);
666 void br_multicast_init(struct net_bridge *br);
667 void br_multicast_open(struct net_bridge *br);
668 void br_multicast_stop(struct net_bridge *br);
669 void br_multicast_dev_del(struct net_bridge *br);
670 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
671                         struct sk_buff *skb, bool local_rcv, bool local_orig);
672 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
673 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
674 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
675 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
676 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
677 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
678 #if IS_ENABLED(CONFIG_IPV6)
679 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
680 #endif
681 struct net_bridge_mdb_entry *
682 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
683 struct net_bridge_mdb_entry *
684 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
685 struct net_bridge_port_group *
686 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
687                             struct net_bridge_port_group __rcu *next,
688                             unsigned char flags, const unsigned char *src);
689 int br_mdb_hash_init(struct net_bridge *br);
690 void br_mdb_hash_fini(struct net_bridge *br);
691 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
692                    struct br_ip *group, int type, u8 flags);
693 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
694                    int type);
695 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
696                         const struct sk_buff *skb, u8 type, u8 dir);
697 int br_multicast_init_stats(struct net_bridge *br);
698 void br_multicast_uninit_stats(struct net_bridge *br);
699 void br_multicast_get_stats(const struct net_bridge *br,
700                             const struct net_bridge_port *p,
701                             struct br_mcast_stats *dest);
702 void br_mdb_init(void);
703 void br_mdb_uninit(void);
704 
705 #define mlock_dereference(X, br) \
706         rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
707 
708 static inline bool br_multicast_is_router(struct net_bridge *br)
709 {
710         return br->multicast_router == 2 ||
711                (br->multicast_router == 1 &&
712                 timer_pending(&br->multicast_router_timer));
713 }
714 
715 static inline bool
716 __br_multicast_querier_exists(struct net_bridge *br,
717                                 struct bridge_mcast_other_query *querier,
718                                 const bool is_ipv6)
719 {
720         bool own_querier_enabled;
721 
722         if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
723                 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
724                         own_querier_enabled = false;
725                 else
726                         own_querier_enabled = true;
727         } else {
728                 own_querier_enabled = false;
729         }
730 
731         return time_is_before_jiffies(querier->delay_time) &&
732                (own_querier_enabled || timer_pending(&querier->timer));
733 }
734 
735 static inline bool br_multicast_querier_exists(struct net_bridge *br,
736                                                struct ethhdr *eth)
737 {
738         switch (eth->h_proto) {
739         case (htons(ETH_P_IP)):
740                 return __br_multicast_querier_exists(br,
741                         &br->ip4_other_query, false);
742 #if IS_ENABLED(CONFIG_IPV6)
743         case (htons(ETH_P_IPV6)):
744                 return __br_multicast_querier_exists(br,
745                         &br->ip6_other_query, true);
746 #endif
747         default:
748                 return false;
749         }
750 }
751 
752 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
753 {
754         return BR_INPUT_SKB_CB(skb)->igmp;
755 }
756 #else
757 static inline int br_multicast_rcv(struct net_bridge *br,
758                                    struct net_bridge_port *port,
759                                    struct sk_buff *skb,
760                                    u16 vid)
761 {
762         return 0;
763 }
764 
765 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
766                                                       struct sk_buff *skb, u16 vid)
767 {
768         return NULL;
769 }
770 
771 static inline int br_multicast_add_port(struct net_bridge_port *port)
772 {
773         return 0;
774 }
775 
776 static inline void br_multicast_del_port(struct net_bridge_port *port)
777 {
778 }
779 
780 static inline void br_multicast_enable_port(struct net_bridge_port *port)
781 {
782 }
783 
784 static inline void br_multicast_disable_port(struct net_bridge_port *port)
785 {
786 }
787 
788 static inline void br_multicast_init(struct net_bridge *br)
789 {
790 }
791 
792 static inline void br_multicast_open(struct net_bridge *br)
793 {
794 }
795 
796 static inline void br_multicast_stop(struct net_bridge *br)
797 {
798 }
799 
800 static inline void br_multicast_dev_del(struct net_bridge *br)
801 {
802 }
803 
804 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
805                                       struct sk_buff *skb,
806                                       bool local_rcv, bool local_orig)
807 {
808 }
809 
810 static inline bool br_multicast_is_router(struct net_bridge *br)
811 {
812         return false;
813 }
814 
815 static inline bool br_multicast_querier_exists(struct net_bridge *br,
816                                                struct ethhdr *eth)
817 {
818         return false;
819 }
820 
821 static inline void br_mdb_init(void)
822 {
823 }
824 
825 static inline void br_mdb_uninit(void)
826 {
827 }
828 
829 static inline int br_mdb_hash_init(struct net_bridge *br)
830 {
831         return 0;
832 }
833 
834 static inline void br_mdb_hash_fini(struct net_bridge *br)
835 {
836 }
837 
838 static inline void br_multicast_count(struct net_bridge *br,
839                                       const struct net_bridge_port *p,
840                                       const struct sk_buff *skb,
841                                       u8 type, u8 dir)
842 {
843 }
844 
845 static inline int br_multicast_init_stats(struct net_bridge *br)
846 {
847         return 0;
848 }
849 
850 static inline void br_multicast_uninit_stats(struct net_bridge *br)
851 {
852 }
853 
854 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
855 {
856         return 0;
857 }
858 #endif
859 
860 /* br_vlan.c */
861 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
862 bool br_allowed_ingress(const struct net_bridge *br,
863                         struct net_bridge_vlan_group *vg, struct sk_buff *skb,
864                         u16 *vid);
865 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
866                        const struct sk_buff *skb);
867 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
868 struct sk_buff *br_handle_vlan(struct net_bridge *br,
869                                const struct net_bridge_port *port,
870                                struct net_bridge_vlan_group *vg,
871                                struct sk_buff *skb);
872 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
873                 bool *changed, struct netlink_ext_ack *extack);
874 int br_vlan_delete(struct net_bridge *br, u16 vid);
875 void br_vlan_flush(struct net_bridge *br);
876 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
877 void br_recalculate_fwd_mask(struct net_bridge *br);
878 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
879 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
880 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
881 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
882 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
883 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
884 int br_vlan_init(struct net_bridge *br);
885 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
886 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
887                                struct netlink_ext_ack *extack);
888 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
889                  bool *changed, struct netlink_ext_ack *extack);
890 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
891 void nbp_vlan_flush(struct net_bridge_port *port);
892 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
893 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
894 void br_vlan_get_stats(const struct net_bridge_vlan *v,
895                        struct br_vlan_stats *stats);
896 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
897 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
898                          void *ptr);
899 
900 static inline struct net_bridge_vlan_group *br_vlan_group(
901                                         const struct net_bridge *br)
902 {
903         return rtnl_dereference(br->vlgrp);
904 }
905 
906 static inline struct net_bridge_vlan_group *nbp_vlan_group(
907                                         const struct net_bridge_port *p)
908 {
909         return rtnl_dereference(p->vlgrp);
910 }
911 
912 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
913                                         const struct net_bridge *br)
914 {
915         return rcu_dereference(br->vlgrp);
916 }
917 
918 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
919                                         const struct net_bridge_port *p)
920 {
921         return rcu_dereference(p->vlgrp);
922 }
923 
924 /* Since bridge now depends on 8021Q module, but the time bridge sees the
925  * skb, the vlan tag will always be present if the frame was tagged.
926  */
927 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
928 {
929         int err = 0;
930 
931         if (skb_vlan_tag_present(skb)) {
932                 *vid = skb_vlan_tag_get_id(skb);
933         } else {
934                 *vid = 0;
935                 err = -EINVAL;
936         }
937 
938         return err;
939 }
940 
941 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
942 {
943         if (!vg)
944                 return 0;
945 
946         smp_rmb();
947         return vg->pvid;
948 }
949 
950 #else
951 static inline bool br_allowed_ingress(const struct net_bridge *br,
952                                       struct net_bridge_vlan_group *vg,
953                                       struct sk_buff *skb,
954                                       u16 *vid)
955 {
956         return true;
957 }
958 
959 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
960                                      const struct sk_buff *skb)
961 {
962         return true;
963 }
964 
965 static inline bool br_should_learn(struct net_bridge_port *p,
966                                    struct sk_buff *skb, u16 *vid)
967 {
968         return true;
969 }
970 
971 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
972                                              const struct net_bridge_port *port,
973                                              struct net_bridge_vlan_group *vg,
974                                              struct sk_buff *skb)
975 {
976         return skb;
977 }
978 
979 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
980                               bool *changed, struct netlink_ext_ack *extack)
981 {
982         *changed = false;
983         return -EOPNOTSUPP;
984 }
985 
986 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
987 {
988         return -EOPNOTSUPP;
989 }
990 
991 static inline void br_vlan_flush(struct net_bridge *br)
992 {
993 }
994 
995 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
996 {
997 }
998 
999 static inline int br_vlan_init(struct net_bridge *br)
1000 {
1001         return 0;
1002 }
1003 
1004 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1005                                bool *changed, struct netlink_ext_ack *extack)
1006 {
1007         *changed = false;
1008         return -EOPNOTSUPP;
1009 }
1010 
1011 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1012 {
1013         return -EOPNOTSUPP;
1014 }
1015 
1016 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1017 {
1018 }
1019 
1020 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1021                                                    u16 vid)
1022 {
1023         return NULL;
1024 }
1025 
1026 static inline int nbp_vlan_init(struct net_bridge_port *port,
1027                                 struct netlink_ext_ack *extack)
1028 {
1029         return 0;
1030 }
1031 
1032 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1033 {
1034         return 0;
1035 }
1036 
1037 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1038 {
1039         return 0;
1040 }
1041 
1042 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1043                                           unsigned long val)
1044 {
1045         return -EOPNOTSUPP;
1046 }
1047 
1048 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1049                                          u32 filter_mask)
1050 {
1051         return 0;
1052 }
1053 
1054 static inline struct net_bridge_vlan_group *br_vlan_group(
1055                                         const struct net_bridge *br)
1056 {
1057         return NULL;
1058 }
1059 
1060 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1061                                         const struct net_bridge_port *p)
1062 {
1063         return NULL;
1064 }
1065 
1066 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1067                                         const struct net_bridge *br)
1068 {
1069         return NULL;
1070 }
1071 
1072 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1073                                         const struct net_bridge_port *p)
1074 {
1075         return NULL;
1076 }
1077 
1078 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1079                                      struct br_vlan_stats *stats)
1080 {
1081 }
1082 
1083 static inline void br_vlan_port_event(struct net_bridge_port *p,
1084                                       unsigned long event)
1085 {
1086 }
1087 
1088 static inline int br_vlan_bridge_event(struct net_device *dev,
1089                                        unsigned long event, void *ptr)
1090 {
1091         return 0;
1092 }
1093 #endif
1094 
1095 struct nf_br_ops {
1096         int (*br_dev_xmit_hook)(struct sk_buff *skb);
1097 };
1098 extern const struct nf_br_ops __rcu *nf_br_ops;
1099 
1100 /* br_netfilter.c */
1101 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1102 int br_nf_core_init(void);
1103 void br_nf_core_fini(void);
1104 void br_netfilter_rtable_init(struct net_bridge *);
1105 #else
1106 static inline int br_nf_core_init(void) { return 0; }
1107 static inline void br_nf_core_fini(void) {}
1108 #define br_netfilter_rtable_init(x)
1109 #endif
1110 
1111 /* br_stp.c */
1112 void br_set_state(struct net_bridge_port *p, unsigned int state);
1113 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1114 void br_init_port(struct net_bridge_port *p);
1115 void br_become_designated_port(struct net_bridge_port *p);
1116 
1117 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1118 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1119 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1120 int br_set_max_age(struct net_bridge *br, unsigned long x);
1121 int __set_ageing_time(struct net_device *dev, unsigned long t);
1122 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1123 
1124 
1125 /* br_stp_if.c */
1126 void br_stp_enable_bridge(struct net_bridge *br);
1127 void br_stp_disable_bridge(struct net_bridge *br);
1128 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1129 void br_stp_enable_port(struct net_bridge_port *p);
1130 void br_stp_disable_port(struct net_bridge_port *p);
1131 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1132 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1133 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1134 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1135 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1136 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1137 
1138 /* br_stp_bpdu.c */
1139 struct stp_proto;
1140 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1141                 struct net_device *dev);
1142 
1143 /* br_stp_timer.c */
1144 void br_stp_timer_init(struct net_bridge *br);
1145 void br_stp_port_timer_init(struct net_bridge_port *p);
1146 unsigned long br_timer_value(const struct timer_list *timer);
1147 
1148 /* br.c */
1149 #if IS_ENABLED(CONFIG_ATM_LANE)
1150 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1151 #endif
1152 
1153 /* br_netlink.c */
1154 extern struct rtnl_link_ops br_link_ops;
1155 int br_netlink_init(void);
1156 void br_netlink_fini(void);
1157 void br_ifinfo_notify(int event, const struct net_bridge *br,
1158                       const struct net_bridge_port *port);
1159 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1160                struct netlink_ext_ack *extack);
1161 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1162 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1163                u32 filter_mask, int nlflags);
1164 
1165 #ifdef CONFIG_SYSFS
1166 /* br_sysfs_if.c */
1167 extern const struct sysfs_ops brport_sysfs_ops;
1168 int br_sysfs_addif(struct net_bridge_port *p);
1169 int br_sysfs_renameif(struct net_bridge_port *p);
1170 
1171 /* br_sysfs_br.c */
1172 int br_sysfs_addbr(struct net_device *dev);
1173 void br_sysfs_delbr(struct net_device *dev);
1174 
1175 #else
1176 
1177 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1178 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1179 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1180 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1181 #endif /* CONFIG_SYSFS */
1182 
1183 /* br_switchdev.c */
1184 #ifdef CONFIG_NET_SWITCHDEV
1185 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1186 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1187                               struct sk_buff *skb);
1188 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1189                                   const struct sk_buff *skb);
1190 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1191                                unsigned long flags,
1192                                unsigned long mask);
1193 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1194                              int type);
1195 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1196                                struct netlink_ext_ack *extack);
1197 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1198 
1199 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1200 {
1201         skb->offload_fwd_mark = 0;
1202 }
1203 #else
1204 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1205 {
1206         return 0;
1207 }
1208 
1209 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1210                                             struct sk_buff *skb)
1211 {
1212 }
1213 
1214 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1215                                                 const struct sk_buff *skb)
1216 {
1217         return true;
1218 }
1219 
1220 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1221                                              unsigned long flags,
1222                                              unsigned long mask)
1223 {
1224         return 0;
1225 }
1226 
1227 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1228                                              u16 vid, u16 flags,
1229                                              struct netlink_ext_ack *extack)
1230 {
1231         return -EOPNOTSUPP;
1232 }
1233 
1234 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1235 {
1236         return -EOPNOTSUPP;
1237 }
1238 
1239 static inline void
1240 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1241 {
1242 }
1243 
1244 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1245 {
1246 }
1247 #endif /* CONFIG_NET_SWITCHDEV */
1248 
1249 /* br_arp_nd_proxy.c */
1250 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1251 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1252                               u16 vid, struct net_bridge_port *p);
1253 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1254                        u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1255 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);
1256 #endif
1257 

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