xref: /openbmc/linux/net/bridge/br_private.h (revision b34e08d5)
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 <linux/if_vlan.h>
22 
23 #define BR_HASH_BITS 8
24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
25 
26 #define BR_HOLD_TIME (1*HZ)
27 
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)
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 control protocols like STP and LLDP */
37 #define BR_GROUPFWD_RESTRICTED	0x4007u
38 
39 /* Path to usermode spanning tree program */
40 #define BR_STP_PROG	"/sbin/bridge-stp"
41 
42 typedef struct bridge_id bridge_id;
43 typedef struct mac_addr mac_addr;
44 typedef __u16 port_id;
45 
46 struct bridge_id
47 {
48 	unsigned char	prio[2];
49 	unsigned char	addr[ETH_ALEN];
50 };
51 
52 struct mac_addr
53 {
54 	unsigned char	addr[ETH_ALEN];
55 };
56 
57 struct br_ip
58 {
59 	union {
60 		__be32	ip4;
61 #if IS_ENABLED(CONFIG_IPV6)
62 		struct in6_addr ip6;
63 #endif
64 	} u;
65 	__be16		proto;
66 	__u16		vid;
67 };
68 
69 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
70 /* our own querier */
71 struct bridge_mcast_query {
72 	struct timer_list	timer;
73 	u32			startup_sent;
74 };
75 
76 /* other querier */
77 struct bridge_mcast_querier {
78 	struct timer_list		timer;
79 	unsigned long			delay_time;
80 };
81 #endif
82 
83 struct net_port_vlans {
84 	u16				port_idx;
85 	u16				pvid;
86 	union {
87 		struct net_bridge_port		*port;
88 		struct net_bridge		*br;
89 	}				parent;
90 	struct rcu_head			rcu;
91 	unsigned long			vlan_bitmap[BR_VLAN_BITMAP_LEN];
92 	unsigned long			untagged_bitmap[BR_VLAN_BITMAP_LEN];
93 	u16				num_vlans;
94 };
95 
96 struct net_bridge_fdb_entry
97 {
98 	struct hlist_node		hlist;
99 	struct net_bridge_port		*dst;
100 
101 	struct rcu_head			rcu;
102 	unsigned long			updated;
103 	unsigned long			used;
104 	mac_addr			addr;
105 	unsigned char			is_local;
106 	unsigned char			is_static;
107 	unsigned char			added_by_user;
108 	__u16				vlan_id;
109 };
110 
111 struct net_bridge_port_group {
112 	struct net_bridge_port		*port;
113 	struct net_bridge_port_group __rcu *next;
114 	struct hlist_node		mglist;
115 	struct rcu_head			rcu;
116 	struct timer_list		timer;
117 	struct br_ip			addr;
118 	unsigned char			state;
119 };
120 
121 struct net_bridge_mdb_entry
122 {
123 	struct hlist_node		hlist[2];
124 	struct net_bridge		*br;
125 	struct net_bridge_port_group __rcu *ports;
126 	struct rcu_head			rcu;
127 	struct timer_list		timer;
128 	struct br_ip			addr;
129 	bool				mglist;
130 };
131 
132 struct net_bridge_mdb_htable
133 {
134 	struct hlist_head		*mhash;
135 	struct rcu_head			rcu;
136 	struct net_bridge_mdb_htable	*old;
137 	u32				size;
138 	u32				max;
139 	u32				secret;
140 	u32				ver;
141 };
142 
143 struct net_bridge_port
144 {
145 	struct net_bridge		*br;
146 	struct net_device		*dev;
147 	struct list_head		list;
148 
149 	/* STP */
150 	u8				priority;
151 	u8				state;
152 	u16				port_no;
153 	unsigned char			topology_change_ack;
154 	unsigned char			config_pending;
155 	port_id				port_id;
156 	port_id				designated_port;
157 	bridge_id			designated_root;
158 	bridge_id			designated_bridge;
159 	u32				path_cost;
160 	u32				designated_cost;
161 	unsigned long			designated_age;
162 
163 	struct timer_list		forward_delay_timer;
164 	struct timer_list		hold_timer;
165 	struct timer_list		message_age_timer;
166 	struct kobject			kobj;
167 	struct rcu_head			rcu;
168 
169 	unsigned long 			flags;
170 #define BR_HAIRPIN_MODE		0x00000001
171 #define BR_BPDU_GUARD           0x00000002
172 #define BR_ROOT_BLOCK		0x00000004
173 #define BR_MULTICAST_FAST_LEAVE	0x00000008
174 #define BR_ADMIN_COST		0x00000010
175 #define BR_LEARNING		0x00000020
176 #define BR_FLOOD		0x00000040
177 
178 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
179 	struct bridge_mcast_query	ip4_query;
180 #if IS_ENABLED(CONFIG_IPV6)
181 	struct bridge_mcast_query	ip6_query;
182 #endif /* IS_ENABLED(CONFIG_IPV6) */
183 	unsigned char			multicast_router;
184 	struct timer_list		multicast_router_timer;
185 	struct hlist_head		mglist;
186 	struct hlist_node		rlist;
187 #endif
188 
189 #ifdef CONFIG_SYSFS
190 	char				sysfs_name[IFNAMSIZ];
191 #endif
192 
193 #ifdef CONFIG_NET_POLL_CONTROLLER
194 	struct netpoll			*np;
195 #endif
196 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
197 	struct net_port_vlans __rcu	*vlan_info;
198 #endif
199 };
200 
201 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
202 
203 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
204 {
205 	return rcu_dereference(dev->rx_handler_data);
206 }
207 
208 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
209 {
210 	return br_port_exists(dev) ?
211 		rtnl_dereference(dev->rx_handler_data) : NULL;
212 }
213 
214 struct net_bridge
215 {
216 	spinlock_t			lock;
217 	struct list_head		port_list;
218 	struct net_device		*dev;
219 
220 	struct pcpu_sw_netstats		__percpu *stats;
221 	spinlock_t			hash_lock;
222 	struct hlist_head		hash[BR_HASH_SIZE];
223 #ifdef CONFIG_BRIDGE_NETFILTER
224 	struct rtable 			fake_rtable;
225 	bool				nf_call_iptables;
226 	bool				nf_call_ip6tables;
227 	bool				nf_call_arptables;
228 #endif
229 	u16				group_fwd_mask;
230 
231 	/* STP */
232 	bridge_id			designated_root;
233 	bridge_id			bridge_id;
234 	u32				root_path_cost;
235 	unsigned long			max_age;
236 	unsigned long			hello_time;
237 	unsigned long			forward_delay;
238 	unsigned long			bridge_max_age;
239 	unsigned long			ageing_time;
240 	unsigned long			bridge_hello_time;
241 	unsigned long			bridge_forward_delay;
242 
243 	u8				group_addr[ETH_ALEN];
244 	u16				root_port;
245 
246 	enum {
247 		BR_NO_STP, 		/* no spanning tree */
248 		BR_KERNEL_STP,		/* old STP in kernel */
249 		BR_USER_STP,		/* new RSTP in userspace */
250 	} stp_enabled;
251 
252 	unsigned char			topology_change;
253 	unsigned char			topology_change_detected;
254 
255 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
256 	unsigned char			multicast_router;
257 
258 	u8				multicast_disabled:1;
259 	u8				multicast_querier:1;
260 	u8				multicast_query_use_ifaddr:1;
261 
262 	u32				hash_elasticity;
263 	u32				hash_max;
264 
265 	u32				multicast_last_member_count;
266 	u32				multicast_startup_query_count;
267 
268 	unsigned long			multicast_last_member_interval;
269 	unsigned long			multicast_membership_interval;
270 	unsigned long			multicast_querier_interval;
271 	unsigned long			multicast_query_interval;
272 	unsigned long			multicast_query_response_interval;
273 	unsigned long			multicast_startup_query_interval;
274 
275 	spinlock_t			multicast_lock;
276 	struct net_bridge_mdb_htable __rcu *mdb;
277 	struct hlist_head		router_list;
278 
279 	struct timer_list		multicast_router_timer;
280 	struct bridge_mcast_querier	ip4_querier;
281 	struct bridge_mcast_query	ip4_query;
282 #if IS_ENABLED(CONFIG_IPV6)
283 	struct bridge_mcast_querier	ip6_querier;
284 	struct bridge_mcast_query	ip6_query;
285 #endif /* IS_ENABLED(CONFIG_IPV6) */
286 #endif
287 
288 	struct timer_list		hello_timer;
289 	struct timer_list		tcn_timer;
290 	struct timer_list		topology_change_timer;
291 	struct timer_list		gc_timer;
292 	struct kobject			*ifobj;
293 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
294 	u8				vlan_enabled;
295 	struct net_port_vlans __rcu	*vlan_info;
296 #endif
297 };
298 
299 struct br_input_skb_cb {
300 	struct net_device *brdev;
301 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
302 	int igmp;
303 	int mrouters_only;
304 #endif
305 };
306 
307 #define BR_INPUT_SKB_CB(__skb)	((struct br_input_skb_cb *)(__skb)->cb)
308 
309 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
310 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)	(BR_INPUT_SKB_CB(__skb)->mrouters_only)
311 #else
312 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb)	(0)
313 #endif
314 
315 #define br_printk(level, br, format, args...)	\
316 	printk(level "%s: " format, (br)->dev->name, ##args)
317 
318 #define br_err(__br, format, args...)			\
319 	br_printk(KERN_ERR, __br, format, ##args)
320 #define br_warn(__br, format, args...)			\
321 	br_printk(KERN_WARNING, __br, format, ##args)
322 #define br_notice(__br, format, args...)		\
323 	br_printk(KERN_NOTICE, __br, format, ##args)
324 #define br_info(__br, format, args...)			\
325 	br_printk(KERN_INFO, __br, format, ##args)
326 
327 #define br_debug(br, format, args...)			\
328 	pr_debug("%s: " format,  (br)->dev->name, ##args)
329 
330 extern struct notifier_block br_device_notifier;
331 
332 /* called under bridge lock */
333 static inline int br_is_root_bridge(const struct net_bridge *br)
334 {
335 	return !memcmp(&br->bridge_id, &br->designated_root, 8);
336 }
337 
338 /* br_device.c */
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,
344 				       struct sk_buff *skb)
345 {
346 	struct netpoll *np = p->np;
347 
348 	if (np)
349 		netpoll_send_skb(np, skb);
350 }
351 
352 int br_netpoll_enable(struct net_bridge_port *p);
353 void br_netpoll_disable(struct net_bridge_port *p);
354 #else
355 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
356 				       struct sk_buff *skb)
357 {
358 }
359 
360 static inline int br_netpoll_enable(struct net_bridge_port *p)
361 {
362 	return 0;
363 }
364 
365 static inline void br_netpoll_disable(struct net_bridge_port *p)
366 {
367 }
368 #endif
369 
370 /* br_fdb.c */
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,
386 		   unsigned long off);
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);
391 
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 
399 /* br_forward.c */
400 void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
401 int br_dev_queue_push_xmit(struct sk_buff *skb);
402 void br_forward(const struct net_bridge_port *to,
403 		struct sk_buff *skb, struct sk_buff *skb0);
404 int br_forward_finish(struct sk_buff *skb);
405 void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
406 void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
407 		      struct sk_buff *skb2, bool unicast);
408 
409 /* br_if.c */
410 void br_port_carrier_check(struct net_bridge_port *p);
411 int br_add_bridge(struct net *net, const char *name);
412 int br_del_bridge(struct net *net, const char *name);
413 int br_add_if(struct net_bridge *br, struct net_device *dev);
414 int br_del_if(struct net_bridge *br, struct net_device *dev);
415 int br_min_mtu(const struct net_bridge *br);
416 netdev_features_t br_features_recompute(struct net_bridge *br,
417 					netdev_features_t features);
418 
419 /* br_input.c */
420 int br_handle_frame_finish(struct sk_buff *skb);
421 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
422 
423 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
424 {
425 	return rcu_dereference(dev->rx_handler) == br_handle_frame;
426 }
427 
428 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
429 {
430 	return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
431 }
432 
433 /* br_ioctl.c */
434 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
435 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
436 			     void __user *arg);
437 
438 /* br_multicast.c */
439 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
440 extern unsigned int br_mdb_rehash_seq;
441 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
442 		     struct sk_buff *skb, u16 vid);
443 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
444 					struct sk_buff *skb, u16 vid);
445 void br_multicast_add_port(struct net_bridge_port *port);
446 void br_multicast_del_port(struct net_bridge_port *port);
447 void br_multicast_enable_port(struct net_bridge_port *port);
448 void br_multicast_disable_port(struct net_bridge_port *port);
449 void br_multicast_init(struct net_bridge *br);
450 void br_multicast_open(struct net_bridge *br);
451 void br_multicast_stop(struct net_bridge *br);
452 void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
453 			  struct sk_buff *skb);
454 void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
455 			  struct sk_buff *skb, struct sk_buff *skb2);
456 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
457 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
458 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
459 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
460 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
461 struct net_bridge_mdb_entry *
462 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
463 struct net_bridge_mdb_entry *
464 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
465 		       struct br_ip *group);
466 void br_multicast_free_pg(struct rcu_head *head);
467 struct net_bridge_port_group *
468 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
469 			    struct net_bridge_port_group __rcu *next,
470 			    unsigned char state);
471 void br_mdb_init(void);
472 void br_mdb_uninit(void);
473 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
474 		   struct br_ip *group, int type);
475 
476 #define mlock_dereference(X, br) \
477 	rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
478 
479 static inline bool br_multicast_is_router(struct net_bridge *br)
480 {
481 	return br->multicast_router == 2 ||
482 	       (br->multicast_router == 1 &&
483 		timer_pending(&br->multicast_router_timer));
484 }
485 
486 static inline bool
487 __br_multicast_querier_exists(struct net_bridge *br,
488 			      struct bridge_mcast_querier *querier)
489 {
490 	return time_is_before_jiffies(querier->delay_time) &&
491 	       (br->multicast_querier || timer_pending(&querier->timer));
492 }
493 
494 static inline bool br_multicast_querier_exists(struct net_bridge *br,
495 					       struct ethhdr *eth)
496 {
497 	switch (eth->h_proto) {
498 	case (htons(ETH_P_IP)):
499 		return __br_multicast_querier_exists(br, &br->ip4_querier);
500 #if IS_ENABLED(CONFIG_IPV6)
501 	case (htons(ETH_P_IPV6)):
502 		return __br_multicast_querier_exists(br, &br->ip6_querier);
503 #endif
504 	default:
505 		return false;
506 	}
507 }
508 #else
509 static inline int br_multicast_rcv(struct net_bridge *br,
510 				   struct net_bridge_port *port,
511 				   struct sk_buff *skb,
512 				   u16 vid)
513 {
514 	return 0;
515 }
516 
517 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
518 						      struct sk_buff *skb, u16 vid)
519 {
520 	return NULL;
521 }
522 
523 static inline void br_multicast_add_port(struct net_bridge_port *port)
524 {
525 }
526 
527 static inline void br_multicast_del_port(struct net_bridge_port *port)
528 {
529 }
530 
531 static inline void br_multicast_enable_port(struct net_bridge_port *port)
532 {
533 }
534 
535 static inline void br_multicast_disable_port(struct net_bridge_port *port)
536 {
537 }
538 
539 static inline void br_multicast_init(struct net_bridge *br)
540 {
541 }
542 
543 static inline void br_multicast_open(struct net_bridge *br)
544 {
545 }
546 
547 static inline void br_multicast_stop(struct net_bridge *br)
548 {
549 }
550 
551 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
552 					struct sk_buff *skb)
553 {
554 }
555 
556 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
557 					struct sk_buff *skb,
558 					struct sk_buff *skb2)
559 {
560 }
561 static inline bool br_multicast_is_router(struct net_bridge *br)
562 {
563 	return 0;
564 }
565 static inline bool br_multicast_querier_exists(struct net_bridge *br,
566 					       struct ethhdr *eth)
567 {
568 	return false;
569 }
570 static inline void br_mdb_init(void)
571 {
572 }
573 static inline void br_mdb_uninit(void)
574 {
575 }
576 #endif
577 
578 /* br_vlan.c */
579 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
580 bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
581 			struct sk_buff *skb, u16 *vid);
582 bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
583 		       const struct sk_buff *skb);
584 struct sk_buff *br_handle_vlan(struct net_bridge *br,
585 			       const struct net_port_vlans *v,
586 			       struct sk_buff *skb);
587 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
588 int br_vlan_delete(struct net_bridge *br, u16 vid);
589 void br_vlan_flush(struct net_bridge *br);
590 bool br_vlan_find(struct net_bridge *br, u16 vid);
591 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
592 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
593 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
594 void nbp_vlan_flush(struct net_bridge_port *port);
595 bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
596 
597 static inline struct net_port_vlans *br_get_vlan_info(
598 						const struct net_bridge *br)
599 {
600 	return rcu_dereference_rtnl(br->vlan_info);
601 }
602 
603 static inline struct net_port_vlans *nbp_get_vlan_info(
604 						const struct net_bridge_port *p)
605 {
606 	return rcu_dereference_rtnl(p->vlan_info);
607 }
608 
609 /* Since bridge now depends on 8021Q module, but the time bridge sees the
610  * skb, the vlan tag will always be present if the frame was tagged.
611  */
612 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
613 {
614 	int err = 0;
615 
616 	if (vlan_tx_tag_present(skb))
617 		*vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
618 	else {
619 		*vid = 0;
620 		err = -EINVAL;
621 	}
622 
623 	return err;
624 }
625 
626 static inline u16 br_get_pvid(const struct net_port_vlans *v)
627 {
628 	/* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
629 	 * vid wasn't set
630 	 */
631 	smp_rmb();
632 	return v->pvid ?: VLAN_N_VID;
633 }
634 
635 #else
636 static inline bool br_allowed_ingress(struct net_bridge *br,
637 				      struct net_port_vlans *v,
638 				      struct sk_buff *skb,
639 				      u16 *vid)
640 {
641 	return true;
642 }
643 
644 static inline bool br_allowed_egress(struct net_bridge *br,
645 				     const struct net_port_vlans *v,
646 				     const struct sk_buff *skb)
647 {
648 	return true;
649 }
650 
651 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
652 					     const struct net_port_vlans *v,
653 					     struct sk_buff *skb)
654 {
655 	return skb;
656 }
657 
658 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
659 {
660 	return -EOPNOTSUPP;
661 }
662 
663 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
664 {
665 	return -EOPNOTSUPP;
666 }
667 
668 static inline void br_vlan_flush(struct net_bridge *br)
669 {
670 }
671 
672 static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
673 {
674 	return false;
675 }
676 
677 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
678 {
679 	return -EOPNOTSUPP;
680 }
681 
682 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
683 {
684 	return -EOPNOTSUPP;
685 }
686 
687 static inline void nbp_vlan_flush(struct net_bridge_port *port)
688 {
689 }
690 
691 static inline struct net_port_vlans *br_get_vlan_info(
692 						const struct net_bridge *br)
693 {
694 	return NULL;
695 }
696 static inline struct net_port_vlans *nbp_get_vlan_info(
697 						const struct net_bridge_port *p)
698 {
699 	return NULL;
700 }
701 
702 static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
703 {
704 	return false;
705 }
706 
707 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
708 {
709 	return 0;
710 }
711 static inline u16 br_get_pvid(const struct net_port_vlans *v)
712 {
713 	return VLAN_N_VID;	/* Returns invalid vid */
714 }
715 #endif
716 
717 /* br_netfilter.c */
718 #ifdef CONFIG_BRIDGE_NETFILTER
719 int br_netfilter_init(void);
720 void br_netfilter_fini(void);
721 void br_netfilter_rtable_init(struct net_bridge *);
722 #else
723 #define br_netfilter_init()	(0)
724 #define br_netfilter_fini()	do { } while (0)
725 #define br_netfilter_rtable_init(x)
726 #endif
727 
728 /* br_stp.c */
729 void br_log_state(const struct net_bridge_port *p);
730 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
731 void br_init_port(struct net_bridge_port *p);
732 void br_become_designated_port(struct net_bridge_port *p);
733 
734 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
735 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
736 int br_set_hello_time(struct net_bridge *br, unsigned long x);
737 int br_set_max_age(struct net_bridge *br, unsigned long x);
738 
739 
740 /* br_stp_if.c */
741 void br_stp_enable_bridge(struct net_bridge *br);
742 void br_stp_disable_bridge(struct net_bridge *br);
743 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
744 void br_stp_enable_port(struct net_bridge_port *p);
745 void br_stp_disable_port(struct net_bridge_port *p);
746 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
747 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
748 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
749 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
750 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
751 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
752 
753 /* br_stp_bpdu.c */
754 struct stp_proto;
755 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
756 		struct net_device *dev);
757 
758 /* br_stp_timer.c */
759 void br_stp_timer_init(struct net_bridge *br);
760 void br_stp_port_timer_init(struct net_bridge_port *p);
761 unsigned long br_timer_value(const struct timer_list *timer);
762 
763 /* br.c */
764 #if IS_ENABLED(CONFIG_ATM_LANE)
765 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
766 #endif
767 
768 /* br_netlink.c */
769 extern struct rtnl_link_ops br_link_ops;
770 int br_netlink_init(void);
771 void br_netlink_fini(void);
772 void br_ifinfo_notify(int event, struct net_bridge_port *port);
773 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
774 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
775 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
776 	       u32 filter_mask);
777 
778 #ifdef CONFIG_SYSFS
779 /* br_sysfs_if.c */
780 extern const struct sysfs_ops brport_sysfs_ops;
781 int br_sysfs_addif(struct net_bridge_port *p);
782 int br_sysfs_renameif(struct net_bridge_port *p);
783 
784 /* br_sysfs_br.c */
785 int br_sysfs_addbr(struct net_device *dev);
786 void br_sysfs_delbr(struct net_device *dev);
787 
788 #else
789 
790 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
791 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
792 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
793 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
794 #endif /* CONFIG_SYSFS */
795 
796 #endif
797