2 * Linux ethernet bridge
5 * Lennert Buytenhek <buytenh@gnu.org>
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.
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 <linux/if_vlan.h>
23 #define BR_HASH_BITS 8
24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
26 #define BR_HOLD_TIME (1*HZ)
28 #define BR_PORT_BITS 10
29 #define BR_MAX_PORTS (1<<BR_PORT_BITS)
30 #define BR_VLAN_BITMAP_LEN BITS_TO_LONGS(VLAN_N_VID)
32 #define BR_VERSION "2.3"
34 /* Control of forwarding link local multicast */
35 #define BR_GROUPFWD_DEFAULT 0
36 /* Don't allow forwarding control protocols like STP and LLDP */
37 #define BR_GROUPFWD_RESTRICTED 0x4007u
39 /* Path to usermode spanning tree program */
40 #define BR_STP_PROG "/sbin/bridge-stp"
42 typedef struct bridge_id bridge_id;
43 typedef struct mac_addr mac_addr;
44 typedef __u16 port_id;
48 unsigned char prio[2];
49 unsigned char addr[ETH_ALEN];
54 unsigned char addr[ETH_ALEN];
57 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
59 struct bridge_mcast_own_query {
60 struct timer_list timer;
65 struct bridge_mcast_other_query {
66 struct timer_list timer;
67 unsigned long delay_time;
70 /* selected querier */
71 struct bridge_mcast_querier {
73 struct net_bridge_port __rcu *port;
77 struct net_port_vlans {
81 struct net_bridge_port *port;
82 struct net_bridge *br;
85 unsigned long vlan_bitmap[BR_VLAN_BITMAP_LEN];
86 unsigned long untagged_bitmap[BR_VLAN_BITMAP_LEN];
90 struct net_bridge_fdb_entry
92 struct hlist_node hlist;
93 struct net_bridge_port *dst;
96 unsigned long updated;
99 unsigned char is_local;
100 unsigned char is_static;
101 unsigned char added_by_user;
105 struct net_bridge_port_group {
106 struct net_bridge_port *port;
107 struct net_bridge_port_group __rcu *next;
108 struct hlist_node mglist;
110 struct timer_list timer;
115 struct net_bridge_mdb_entry
117 struct hlist_node hlist[2];
118 struct net_bridge *br;
119 struct net_bridge_port_group __rcu *ports;
121 struct timer_list timer;
126 struct net_bridge_mdb_htable
128 struct hlist_head *mhash;
130 struct net_bridge_mdb_htable *old;
137 struct net_bridge_port
139 struct net_bridge *br;
140 struct net_device *dev;
141 struct list_head list;
147 unsigned char topology_change_ack;
148 unsigned char config_pending;
150 port_id designated_port;
151 bridge_id designated_root;
152 bridge_id designated_bridge;
155 unsigned long designated_age;
157 struct timer_list forward_delay_timer;
158 struct timer_list hold_timer;
159 struct timer_list message_age_timer;
164 #define BR_HAIRPIN_MODE 0x00000001
165 #define BR_BPDU_GUARD 0x00000002
166 #define BR_ROOT_BLOCK 0x00000004
167 #define BR_MULTICAST_FAST_LEAVE 0x00000008
168 #define BR_ADMIN_COST 0x00000010
169 #define BR_LEARNING 0x00000020
170 #define BR_FLOOD 0x00000040
171 #define BR_AUTO_MASK (BR_FLOOD | BR_LEARNING)
172 #define BR_PROMISC 0x00000080
174 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
175 struct bridge_mcast_own_query ip4_own_query;
176 #if IS_ENABLED(CONFIG_IPV6)
177 struct bridge_mcast_own_query ip6_own_query;
178 #endif /* IS_ENABLED(CONFIG_IPV6) */
179 unsigned char multicast_router;
180 struct timer_list multicast_router_timer;
181 struct hlist_head mglist;
182 struct hlist_node rlist;
186 char sysfs_name[IFNAMSIZ];
189 #ifdef CONFIG_NET_POLL_CONTROLLER
192 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
193 struct net_port_vlans __rcu *vlan_info;
197 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
198 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
200 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
202 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
204 return rcu_dereference(dev->rx_handler_data);
207 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
209 return br_port_exists(dev) ?
210 rtnl_dereference(dev->rx_handler_data) : NULL;
216 struct list_head port_list;
217 struct net_device *dev;
219 struct pcpu_sw_netstats __percpu *stats;
220 spinlock_t hash_lock;
221 struct hlist_head hash[BR_HASH_SIZE];
222 #ifdef CONFIG_BRIDGE_NETFILTER
223 struct rtable fake_rtable;
224 bool nf_call_iptables;
225 bool nf_call_ip6tables;
226 bool nf_call_arptables;
231 bridge_id designated_root;
234 unsigned long max_age;
235 unsigned long hello_time;
236 unsigned long forward_delay;
237 unsigned long bridge_max_age;
238 unsigned long ageing_time;
239 unsigned long bridge_hello_time;
240 unsigned long bridge_forward_delay;
242 u8 group_addr[ETH_ALEN];
246 BR_NO_STP, /* no spanning tree */
247 BR_KERNEL_STP, /* old STP in kernel */
248 BR_USER_STP, /* new RSTP in userspace */
251 unsigned char topology_change;
252 unsigned char topology_change_detected;
254 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
255 unsigned char multicast_router;
257 u8 multicast_disabled:1;
258 u8 multicast_querier:1;
259 u8 multicast_query_use_ifaddr:1;
264 u32 multicast_last_member_count;
265 u32 multicast_startup_query_count;
267 unsigned long multicast_last_member_interval;
268 unsigned long multicast_membership_interval;
269 unsigned long multicast_querier_interval;
270 unsigned long multicast_query_interval;
271 unsigned long multicast_query_response_interval;
272 unsigned long multicast_startup_query_interval;
274 spinlock_t multicast_lock;
275 struct net_bridge_mdb_htable __rcu *mdb;
276 struct hlist_head router_list;
278 struct timer_list multicast_router_timer;
279 struct bridge_mcast_other_query ip4_other_query;
280 struct bridge_mcast_own_query ip4_own_query;
281 struct bridge_mcast_querier ip4_querier;
282 #if IS_ENABLED(CONFIG_IPV6)
283 struct bridge_mcast_other_query ip6_other_query;
284 struct bridge_mcast_own_query ip6_own_query;
285 struct bridge_mcast_querier ip6_querier;
286 #endif /* IS_ENABLED(CONFIG_IPV6) */
289 struct timer_list hello_timer;
290 struct timer_list tcn_timer;
291 struct timer_list topology_change_timer;
292 struct timer_list gc_timer;
293 struct kobject *ifobj;
295 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
297 struct net_port_vlans __rcu *vlan_info;
301 struct br_input_skb_cb {
302 struct net_device *brdev;
303 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
309 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
311 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
312 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
314 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
317 #define br_printk(level, br, format, args...) \
318 printk(level "%s: " format, (br)->dev->name, ##args)
320 #define br_err(__br, format, args...) \
321 br_printk(KERN_ERR, __br, format, ##args)
322 #define br_warn(__br, format, args...) \
323 br_printk(KERN_WARNING, __br, format, ##args)
324 #define br_notice(__br, format, args...) \
325 br_printk(KERN_NOTICE, __br, format, ##args)
326 #define br_info(__br, format, args...) \
327 br_printk(KERN_INFO, __br, format, ##args)
329 #define br_debug(br, format, args...) \
330 pr_debug("%s: " format, (br)->dev->name, ##args)
332 /* called under bridge lock */
333 static inline int br_is_root_bridge(const struct net_bridge *br)
335 return !memcmp(&br->bridge_id, &br->designated_root, 8);
339 void br_dev_setup(struct net_device *dev);
340 void br_dev_delete(struct net_device *dev, struct list_head *list);
341 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
342 #ifdef CONFIG_NET_POLL_CONTROLLER
343 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
346 struct netpoll *np = p->np;
349 netpoll_send_skb(np, skb);
352 int br_netpoll_enable(struct net_bridge_port *p);
353 void br_netpoll_disable(struct net_bridge_port *p);
355 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
360 static inline int br_netpoll_enable(struct net_bridge_port *p)
365 static inline void br_netpoll_disable(struct net_bridge_port *p)
371 int br_fdb_init(void);
372 void br_fdb_fini(void);
373 void br_fdb_flush(struct net_bridge *br);
374 void br_fdb_find_delete_local(struct net_bridge *br,
375 const struct net_bridge_port *p,
376 const unsigned char *addr, u16 vid);
377 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
378 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
379 void br_fdb_cleanup(unsigned long arg);
380 void br_fdb_delete_by_port(struct net_bridge *br,
381 const struct net_bridge_port *p, int do_all);
382 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
383 const unsigned char *addr, __u16 vid);
384 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
385 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
387 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
388 const unsigned char *addr, u16 vid);
389 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
390 const unsigned char *addr, u16 vid, bool added_by_user);
392 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
393 struct net_device *dev, const unsigned char *addr);
394 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
395 const unsigned char *addr, u16 nlh_flags);
396 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
397 struct net_device *dev, int idx);
398 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
399 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
402 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
403 int br_dev_queue_push_xmit(struct sk_buff *skb);
404 void br_forward(const struct net_bridge_port *to,
405 struct sk_buff *skb, struct sk_buff *skb0);
406 int br_forward_finish(struct sk_buff *skb);
407 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
408 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
409 struct sk_buff *skb2, bool unicast);
412 void br_port_carrier_check(struct net_bridge_port *p);
413 int br_add_bridge(struct net *net, const char *name);
414 int br_del_bridge(struct net *net, const char *name);
415 int br_add_if(struct net_bridge *br, struct net_device *dev);
416 int br_del_if(struct net_bridge *br, struct net_device *dev);
417 int br_min_mtu(const struct net_bridge *br);
418 netdev_features_t br_features_recompute(struct net_bridge *br,
419 netdev_features_t features);
420 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
421 void br_manage_promisc(struct net_bridge *br);
424 int br_handle_frame_finish(struct sk_buff *skb);
425 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
427 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
429 return rcu_dereference(dev->rx_handler) == br_handle_frame;
432 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
434 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
438 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
439 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
443 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
444 extern unsigned int br_mdb_rehash_seq;
445 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
446 struct sk_buff *skb, u16 vid);
447 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
448 struct sk_buff *skb, u16 vid);
449 void br_multicast_add_port(struct net_bridge_port *port);
450 void br_multicast_del_port(struct net_bridge_port *port);
451 void br_multicast_enable_port(struct net_bridge_port *port);
452 void br_multicast_disable_port(struct net_bridge_port *port);
453 void br_multicast_init(struct net_bridge *br);
454 void br_multicast_open(struct net_bridge *br);
455 void br_multicast_stop(struct net_bridge *br);
456 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
457 struct sk_buff *skb);
458 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
459 struct sk_buff *skb, struct sk_buff *skb2);
460 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
461 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
462 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
463 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
464 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
465 struct net_bridge_mdb_entry *
466 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
467 struct net_bridge_mdb_entry *
468 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
469 struct br_ip *group);
470 void br_multicast_free_pg(struct rcu_head *head);
471 struct net_bridge_port_group *
472 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
473 struct net_bridge_port_group __rcu *next,
474 unsigned char state);
475 void br_mdb_init(void);
476 void br_mdb_uninit(void);
477 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
478 struct br_ip *group, int type);
480 #define mlock_dereference(X, br) \
481 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
483 static inline bool br_multicast_is_router(struct net_bridge *br)
485 return br->multicast_router == 2 ||
486 (br->multicast_router == 1 &&
487 timer_pending(&br->multicast_router_timer));
491 __br_multicast_querier_exists(struct net_bridge *br,
492 struct bridge_mcast_other_query *querier)
494 return time_is_before_jiffies(querier->delay_time) &&
495 (br->multicast_querier || timer_pending(&querier->timer));
498 static inline bool br_multicast_querier_exists(struct net_bridge *br,
501 switch (eth->h_proto) {
502 case (htons(ETH_P_IP)):
503 return __br_multicast_querier_exists(br, &br->ip4_other_query);
504 #if IS_ENABLED(CONFIG_IPV6)
505 case (htons(ETH_P_IPV6)):
506 return __br_multicast_querier_exists(br, &br->ip6_other_query);
513 static inline int br_multicast_rcv(struct net_bridge *br,
514 struct net_bridge_port *port,
521 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
522 struct sk_buff *skb, u16 vid)
527 static inline void br_multicast_add_port(struct net_bridge_port *port)
531 static inline void br_multicast_del_port(struct net_bridge_port *port)
535 static inline void br_multicast_enable_port(struct net_bridge_port *port)
539 static inline void br_multicast_disable_port(struct net_bridge_port *port)
543 static inline void br_multicast_init(struct net_bridge *br)
547 static inline void br_multicast_open(struct net_bridge *br)
551 static inline void br_multicast_stop(struct net_bridge *br)
555 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
560 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
562 struct sk_buff *skb2)
565 static inline bool br_multicast_is_router(struct net_bridge *br)
569 static inline bool br_multicast_querier_exists(struct net_bridge *br,
574 static inline void br_mdb_init(void)
577 static inline void br_mdb_uninit(void)
583 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
584 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
585 struct sk_buff *skb, u16 *vid);
586 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
587 const struct sk_buff *skb);
588 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
589 struct sk_buff *br_handle_vlan(struct net_bridge *br,
590 const struct net_port_vlans *v,
591 struct sk_buff *skb);
592 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
593 int br_vlan_delete(struct net_bridge *br, u16 vid);
594 void br_vlan_flush(struct net_bridge *br);
595 bool br_vlan_find(struct net_bridge *br, u16 vid);
596 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
597 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
598 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
599 void nbp_vlan_flush(struct net_bridge_port *port);
600 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
602 static inline struct net_port_vlans *br_get_vlan_info(
603 const struct net_bridge *br)
605 return rcu_dereference_rtnl(br->vlan_info);
608 static inline struct net_port_vlans *nbp_get_vlan_info(
609 const struct net_bridge_port *p)
611 return rcu_dereference_rtnl(p->vlan_info);
614 /* Since bridge now depends on 8021Q module, but the time bridge sees the
615 * skb, the vlan tag will always be present if the frame was tagged.
617 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
621 if (vlan_tx_tag_present(skb))
622 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
631 static inline u16 br_get_pvid(const struct net_port_vlans *v)
633 /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
637 return v->pvid ?: VLAN_N_VID;
640 static inline int br_vlan_enabled(struct net_bridge *br)
642 return br->vlan_enabled;
645 static inline bool br_allowed_ingress(struct net_bridge *br,
646 struct net_port_vlans *v,
653 static inline bool br_allowed_egress(struct net_bridge *br,
654 const struct net_port_vlans *v,
655 const struct sk_buff *skb)
660 static inline bool br_should_learn(struct net_bridge_port *p,
661 struct sk_buff *skb, u16 *vid)
666 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
667 const struct net_port_vlans *v,
673 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
678 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
683 static inline void br_vlan_flush(struct net_bridge *br)
687 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
692 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
697 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
702 static inline void nbp_vlan_flush(struct net_bridge_port *port)
706 static inline struct net_port_vlans *br_get_vlan_info(
707 const struct net_bridge *br)
711 static inline struct net_port_vlans *nbp_get_vlan_info(
712 const struct net_bridge_port *p)
717 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
722 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
726 static inline u16 br_get_pvid(const struct net_port_vlans *v)
728 return VLAN_N_VID; /* Returns invalid vid */
731 static inline int br_vlan_enabled(struct net_bridge *br)
738 #ifdef CONFIG_BRIDGE_NETFILTER
739 int br_netfilter_init(void);
740 void br_netfilter_fini(void);
741 void br_netfilter_rtable_init(struct net_bridge *);
743 #define br_netfilter_init() (0)
744 #define br_netfilter_fini() do { } while (0)
745 #define br_netfilter_rtable_init(x)
749 void br_log_state(const struct net_bridge_port *p);
750 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
751 void br_init_port(struct net_bridge_port *p);
752 void br_become_designated_port(struct net_bridge_port *p);
754 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
755 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
756 int br_set_hello_time(struct net_bridge *br, unsigned long x);
757 int br_set_max_age(struct net_bridge *br, unsigned long x);
761 void br_stp_enable_bridge(struct net_bridge *br);
762 void br_stp_disable_bridge(struct net_bridge *br);
763 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
764 void br_stp_enable_port(struct net_bridge_port *p);
765 void br_stp_disable_port(struct net_bridge_port *p);
766 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
767 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
768 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
769 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
770 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
771 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
775 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
776 struct net_device *dev);
779 void br_stp_timer_init(struct net_bridge *br);
780 void br_stp_port_timer_init(struct net_bridge_port *p);
781 unsigned long br_timer_value(const struct timer_list *timer);
784 #if IS_ENABLED(CONFIG_ATM_LANE)
785 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
789 extern struct rtnl_link_ops br_link_ops;
790 int br_netlink_init(void);
791 void br_netlink_fini(void);
792 void br_ifinfo_notify(int event, struct net_bridge_port *port);
793 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
794 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
795 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
800 extern const struct sysfs_ops brport_sysfs_ops;
801 int br_sysfs_addif(struct net_bridge_port *p);
802 int br_sysfs_renameif(struct net_bridge_port *p);
805 int br_sysfs_addbr(struct net_device *dev);
806 void br_sysfs_delbr(struct net_device *dev);
810 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
811 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
812 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
813 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
814 #endif /* CONFIG_SYSFS */