Loading...
1/*
2 * Linux ethernet bridge
3 *
4 * Authors:
5 * Lennert Buytenhek <buytenh@gnu.org>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13#ifndef _BR_PRIVATE_H
14#define _BR_PRIVATE_H
15
16#include <linux/netdevice.h>
17#include <linux/if_bridge.h>
18#include <linux/netpoll.h>
19#include <linux/u64_stats_sync.h>
20#include <net/route.h>
21#include <net/ip6_fib.h>
22#include <linux/if_vlan.h>
23#include <linux/rhashtable.h>
24
25#define BR_HASH_BITS 8
26#define BR_HASH_SIZE (1 << BR_HASH_BITS)
27
28#define BR_HOLD_TIME (1*HZ)
29
30#define BR_PORT_BITS 10
31#define BR_MAX_PORTS (1<<BR_PORT_BITS)
32
33#define BR_VERSION "2.3"
34
35/* Control of forwarding link local multicast */
36#define BR_GROUPFWD_DEFAULT 0
37/* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
38#define BR_GROUPFWD_RESTRICTED 0x0007u
39/* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
40#define BR_GROUPFWD_8021AD 0xB801u
41
42/* Path to usermode spanning tree program */
43#define BR_STP_PROG "/sbin/bridge-stp"
44
45typedef struct bridge_id bridge_id;
46typedef struct mac_addr mac_addr;
47typedef __u16 port_id;
48
49struct bridge_id
50{
51 unsigned char prio[2];
52 unsigned char addr[ETH_ALEN];
53};
54
55struct mac_addr
56{
57 unsigned char addr[ETH_ALEN];
58};
59
60#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
61/* our own querier */
62struct bridge_mcast_own_query {
63 struct timer_list timer;
64 u32 startup_sent;
65};
66
67/* other querier */
68struct bridge_mcast_other_query {
69 struct timer_list timer;
70 unsigned long delay_time;
71};
72
73/* selected querier */
74struct bridge_mcast_querier {
75 struct br_ip addr;
76 struct net_bridge_port __rcu *port;
77};
78#endif
79
80/**
81 * struct net_bridge_vlan - per-vlan entry
82 *
83 * @vnode: rhashtable member
84 * @vid: VLAN id
85 * @flags: bridge vlan flags
86 * @br: if MASTER flag set, this points to a bridge struct
87 * @port: if MASTER flag unset, this points to a port struct
88 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
89 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
90 * for this VLAN entry
91 * @vlist: sorted list of VLAN entries
92 * @rcu: used for entry destruction
93 *
94 * This structure is shared between the global per-VLAN entries contained in
95 * the bridge rhashtable and the local per-port per-VLAN entries contained in
96 * the port's rhashtable. The union entries should be interpreted depending on
97 * the entry flags that are set.
98 */
99struct net_bridge_vlan {
100 struct rhash_head vnode;
101 u16 vid;
102 u16 flags;
103 union {
104 struct net_bridge *br;
105 struct net_bridge_port *port;
106 };
107 union {
108 atomic_t refcnt;
109 struct net_bridge_vlan *brvlan;
110 };
111 struct list_head vlist;
112
113 struct rcu_head rcu;
114};
115
116/**
117 * struct net_bridge_vlan_group
118 *
119 * @vlan_hash: VLAN entry rhashtable
120 * @vlan_list: sorted VLAN entry list
121 * @num_vlans: number of total VLAN entries
122 * @pvid: PVID VLAN id
123 *
124 * IMPORTANT: Be careful when checking if there're VLAN entries using list
125 * primitives because the bridge can have entries in its list which
126 * are just for global context but not for filtering, i.e. they have
127 * the master flag set but not the brentry flag. If you have to check
128 * if there're "real" entries in the bridge please test @num_vlans
129 */
130struct net_bridge_vlan_group {
131 struct rhashtable vlan_hash;
132 struct list_head vlan_list;
133 u16 num_vlans;
134 u16 pvid;
135};
136
137struct net_bridge_fdb_entry
138{
139 struct hlist_node hlist;
140 struct net_bridge_port *dst;
141
142 unsigned long updated;
143 unsigned long used;
144 mac_addr addr;
145 __u16 vlan_id;
146 unsigned char is_local:1,
147 is_static:1,
148 added_by_user:1,
149 added_by_external_learn:1;
150 struct rcu_head rcu;
151};
152
153#define MDB_PG_FLAGS_PERMANENT BIT(0)
154#define MDB_PG_FLAGS_OFFLOAD BIT(1)
155
156struct net_bridge_port_group {
157 struct net_bridge_port *port;
158 struct net_bridge_port_group __rcu *next;
159 struct hlist_node mglist;
160 struct rcu_head rcu;
161 struct timer_list timer;
162 struct br_ip addr;
163 unsigned char flags;
164};
165
166struct net_bridge_mdb_entry
167{
168 struct hlist_node hlist[2];
169 struct net_bridge *br;
170 struct net_bridge_port_group __rcu *ports;
171 struct rcu_head rcu;
172 struct timer_list timer;
173 struct br_ip addr;
174 bool mglist;
175};
176
177struct net_bridge_mdb_htable
178{
179 struct hlist_head *mhash;
180 struct rcu_head rcu;
181 struct net_bridge_mdb_htable *old;
182 u32 size;
183 u32 max;
184 u32 secret;
185 u32 ver;
186};
187
188struct net_bridge_port
189{
190 struct net_bridge *br;
191 struct net_device *dev;
192 struct list_head list;
193
194 /* STP */
195 u8 priority;
196 u8 state;
197 u16 port_no;
198 unsigned char topology_change_ack;
199 unsigned char config_pending;
200 port_id port_id;
201 port_id designated_port;
202 bridge_id designated_root;
203 bridge_id designated_bridge;
204 u32 path_cost;
205 u32 designated_cost;
206 unsigned long designated_age;
207
208 struct timer_list forward_delay_timer;
209 struct timer_list hold_timer;
210 struct timer_list message_age_timer;
211 struct kobject kobj;
212 struct rcu_head rcu;
213
214 unsigned long flags;
215
216#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
217 struct bridge_mcast_own_query ip4_own_query;
218#if IS_ENABLED(CONFIG_IPV6)
219 struct bridge_mcast_own_query ip6_own_query;
220#endif /* IS_ENABLED(CONFIG_IPV6) */
221 unsigned char multicast_router;
222 struct timer_list multicast_router_timer;
223 struct hlist_head mglist;
224 struct hlist_node rlist;
225#endif
226
227#ifdef CONFIG_SYSFS
228 char sysfs_name[IFNAMSIZ];
229#endif
230
231#ifdef CONFIG_NET_POLL_CONTROLLER
232 struct netpoll *np;
233#endif
234#ifdef CONFIG_BRIDGE_VLAN_FILTERING
235 struct net_bridge_vlan_group __rcu *vlgrp;
236#endif
237};
238
239#define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
240#define br_promisc_port(p) ((p)->flags & BR_PROMISC)
241
242#define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
243
244static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
245{
246 return rcu_dereference(dev->rx_handler_data);
247}
248
249static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
250{
251 return br_port_exists(dev) ?
252 rtnl_dereference(dev->rx_handler_data) : NULL;
253}
254
255struct net_bridge
256{
257 spinlock_t lock;
258 struct list_head port_list;
259 struct net_device *dev;
260
261 struct pcpu_sw_netstats __percpu *stats;
262 spinlock_t hash_lock;
263 struct hlist_head hash[BR_HASH_SIZE];
264#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
265 union {
266 struct rtable fake_rtable;
267 struct rt6_info fake_rt6_info;
268 };
269 bool nf_call_iptables;
270 bool nf_call_ip6tables;
271 bool nf_call_arptables;
272#endif
273 u16 group_fwd_mask;
274 u16 group_fwd_mask_required;
275
276 /* STP */
277 bridge_id designated_root;
278 bridge_id bridge_id;
279 u32 root_path_cost;
280 unsigned long max_age;
281 unsigned long hello_time;
282 unsigned long forward_delay;
283 unsigned long bridge_max_age;
284 unsigned long ageing_time;
285 unsigned long bridge_hello_time;
286 unsigned long bridge_forward_delay;
287
288 u8 group_addr[ETH_ALEN];
289 bool group_addr_set;
290 u16 root_port;
291
292 enum {
293 BR_NO_STP, /* no spanning tree */
294 BR_KERNEL_STP, /* old STP in kernel */
295 BR_USER_STP, /* new RSTP in userspace */
296 } stp_enabled;
297
298 unsigned char topology_change;
299 unsigned char topology_change_detected;
300
301#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
302 unsigned char multicast_router;
303
304 u8 multicast_disabled:1;
305 u8 multicast_querier:1;
306 u8 multicast_query_use_ifaddr:1;
307
308 u32 hash_elasticity;
309 u32 hash_max;
310
311 u32 multicast_last_member_count;
312 u32 multicast_startup_query_count;
313
314 unsigned long multicast_last_member_interval;
315 unsigned long multicast_membership_interval;
316 unsigned long multicast_querier_interval;
317 unsigned long multicast_query_interval;
318 unsigned long multicast_query_response_interval;
319 unsigned long multicast_startup_query_interval;
320
321 spinlock_t multicast_lock;
322 struct net_bridge_mdb_htable __rcu *mdb;
323 struct hlist_head router_list;
324
325 struct timer_list multicast_router_timer;
326 struct bridge_mcast_other_query ip4_other_query;
327 struct bridge_mcast_own_query ip4_own_query;
328 struct bridge_mcast_querier ip4_querier;
329#if IS_ENABLED(CONFIG_IPV6)
330 struct bridge_mcast_other_query ip6_other_query;
331 struct bridge_mcast_own_query ip6_own_query;
332 struct bridge_mcast_querier ip6_querier;
333#endif /* IS_ENABLED(CONFIG_IPV6) */
334#endif
335
336 struct timer_list hello_timer;
337 struct timer_list tcn_timer;
338 struct timer_list topology_change_timer;
339 struct timer_list gc_timer;
340 struct kobject *ifobj;
341 u32 auto_cnt;
342#ifdef CONFIG_BRIDGE_VLAN_FILTERING
343 struct net_bridge_vlan_group __rcu *vlgrp;
344 u8 vlan_enabled;
345 __be16 vlan_proto;
346 u16 default_pvid;
347#endif
348};
349
350struct br_input_skb_cb {
351 struct net_device *brdev;
352
353#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
354 int igmp;
355 int mrouters_only;
356#endif
357
358 bool proxyarp_replied;
359
360#ifdef CONFIG_BRIDGE_VLAN_FILTERING
361 bool vlan_filtered;
362#endif
363};
364
365#define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
366
367#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
368# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
369#else
370# define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
371#endif
372
373#define br_printk(level, br, format, args...) \
374 printk(level "%s: " format, (br)->dev->name, ##args)
375
376#define br_err(__br, format, args...) \
377 br_printk(KERN_ERR, __br, format, ##args)
378#define br_warn(__br, format, args...) \
379 br_printk(KERN_WARNING, __br, format, ##args)
380#define br_notice(__br, format, args...) \
381 br_printk(KERN_NOTICE, __br, format, ##args)
382#define br_info(__br, format, args...) \
383 br_printk(KERN_INFO, __br, format, ##args)
384
385#define br_debug(br, format, args...) \
386 pr_debug("%s: " format, (br)->dev->name, ##args)
387
388/* called under bridge lock */
389static inline int br_is_root_bridge(const struct net_bridge *br)
390{
391 return !memcmp(&br->bridge_id, &br->designated_root, 8);
392}
393
394/* check if a VLAN entry is global */
395static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
396{
397 return v->flags & BRIDGE_VLAN_INFO_MASTER;
398}
399
400/* check if a VLAN entry is used by the bridge */
401static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
402{
403 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
404}
405
406/* check if we should use the vlan entry, returns false if it's only context */
407static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
408{
409 if (br_vlan_is_master(v)) {
410 if (br_vlan_is_brentry(v))
411 return true;
412 else
413 return false;
414 }
415
416 return true;
417}
418
419/* br_device.c */
420void br_dev_setup(struct net_device *dev);
421void br_dev_delete(struct net_device *dev, struct list_head *list);
422netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
423#ifdef CONFIG_NET_POLL_CONTROLLER
424static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
425 struct sk_buff *skb)
426{
427 struct netpoll *np = p->np;
428
429 if (np)
430 netpoll_send_skb(np, skb);
431}
432
433int br_netpoll_enable(struct net_bridge_port *p);
434void br_netpoll_disable(struct net_bridge_port *p);
435#else
436static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
437 struct sk_buff *skb)
438{
439}
440
441static inline int br_netpoll_enable(struct net_bridge_port *p)
442{
443 return 0;
444}
445
446static inline void br_netpoll_disable(struct net_bridge_port *p)
447{
448}
449#endif
450
451/* br_fdb.c */
452int br_fdb_init(void);
453void br_fdb_fini(void);
454void br_fdb_flush(struct net_bridge *br);
455void br_fdb_find_delete_local(struct net_bridge *br,
456 const struct net_bridge_port *p,
457 const unsigned char *addr, u16 vid);
458void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
459void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
460void br_fdb_cleanup(unsigned long arg);
461void br_fdb_delete_by_port(struct net_bridge *br,
462 const struct net_bridge_port *p, u16 vid, int do_all);
463struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
464 const unsigned char *addr, __u16 vid);
465int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
466int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
467 unsigned long off);
468int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
469 const unsigned char *addr, u16 vid);
470void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
471 const unsigned char *addr, u16 vid, bool added_by_user);
472
473int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
474 struct net_device *dev, const unsigned char *addr, u16 vid);
475int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
476 const unsigned char *addr, u16 vid, u16 nlh_flags);
477int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
478 struct net_device *dev, struct net_device *fdev, int idx);
479int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
480void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
481int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
482 const unsigned char *addr, u16 vid);
483int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
484 const unsigned char *addr, u16 vid);
485
486/* br_forward.c */
487void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
488int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
489void br_forward(const struct net_bridge_port *to,
490 struct sk_buff *skb, struct sk_buff *skb0);
491int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
492void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
493void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
494 struct sk_buff *skb2, bool unicast);
495
496/* br_if.c */
497void br_port_carrier_check(struct net_bridge_port *p);
498int br_add_bridge(struct net *net, const char *name);
499int br_del_bridge(struct net *net, const char *name);
500int br_add_if(struct net_bridge *br, struct net_device *dev);
501int br_del_if(struct net_bridge *br, struct net_device *dev);
502int br_min_mtu(const struct net_bridge *br);
503netdev_features_t br_features_recompute(struct net_bridge *br,
504 netdev_features_t features);
505void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
506void br_manage_promisc(struct net_bridge *br);
507
508/* br_input.c */
509int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
510rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
511
512static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
513{
514 return rcu_dereference(dev->rx_handler) == br_handle_frame;
515}
516
517static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
518{
519 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
520}
521
522/* br_ioctl.c */
523int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
524int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
525 void __user *arg);
526
527/* br_multicast.c */
528#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
529extern unsigned int br_mdb_rehash_seq;
530int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
531 struct sk_buff *skb, u16 vid);
532struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
533 struct sk_buff *skb, u16 vid);
534void br_multicast_add_port(struct net_bridge_port *port);
535void br_multicast_del_port(struct net_bridge_port *port);
536void br_multicast_enable_port(struct net_bridge_port *port);
537void br_multicast_disable_port(struct net_bridge_port *port);
538void br_multicast_init(struct net_bridge *br);
539void br_multicast_open(struct net_bridge *br);
540void br_multicast_stop(struct net_bridge *br);
541void br_multicast_dev_del(struct net_bridge *br);
542void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
543 struct sk_buff *skb);
544void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
545 struct sk_buff *skb, struct sk_buff *skb2);
546int br_multicast_set_router(struct net_bridge *br, unsigned long val);
547int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
548int br_multicast_toggle(struct net_bridge *br, unsigned long val);
549int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
550int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
551struct net_bridge_mdb_entry *
552br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
553struct net_bridge_mdb_entry *
554br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
555 struct br_ip *group);
556void br_multicast_free_pg(struct rcu_head *head);
557struct net_bridge_port_group *
558br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
559 struct net_bridge_port_group __rcu *next,
560 unsigned char flags);
561void br_mdb_init(void);
562void br_mdb_uninit(void);
563void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
564 struct br_ip *group, int type, u8 flags);
565void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
566 int type);
567
568#define mlock_dereference(X, br) \
569 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
570
571static inline bool br_multicast_is_router(struct net_bridge *br)
572{
573 return br->multicast_router == 2 ||
574 (br->multicast_router == 1 &&
575 timer_pending(&br->multicast_router_timer));
576}
577
578static inline bool
579__br_multicast_querier_exists(struct net_bridge *br,
580 struct bridge_mcast_other_query *querier)
581{
582 return time_is_before_jiffies(querier->delay_time) &&
583 (br->multicast_querier || timer_pending(&querier->timer));
584}
585
586static inline bool br_multicast_querier_exists(struct net_bridge *br,
587 struct ethhdr *eth)
588{
589 switch (eth->h_proto) {
590 case (htons(ETH_P_IP)):
591 return __br_multicast_querier_exists(br, &br->ip4_other_query);
592#if IS_ENABLED(CONFIG_IPV6)
593 case (htons(ETH_P_IPV6)):
594 return __br_multicast_querier_exists(br, &br->ip6_other_query);
595#endif
596 default:
597 return false;
598 }
599}
600#else
601static inline int br_multicast_rcv(struct net_bridge *br,
602 struct net_bridge_port *port,
603 struct sk_buff *skb,
604 u16 vid)
605{
606 return 0;
607}
608
609static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
610 struct sk_buff *skb, u16 vid)
611{
612 return NULL;
613}
614
615static inline void br_multicast_add_port(struct net_bridge_port *port)
616{
617}
618
619static inline void br_multicast_del_port(struct net_bridge_port *port)
620{
621}
622
623static inline void br_multicast_enable_port(struct net_bridge_port *port)
624{
625}
626
627static inline void br_multicast_disable_port(struct net_bridge_port *port)
628{
629}
630
631static inline void br_multicast_init(struct net_bridge *br)
632{
633}
634
635static inline void br_multicast_open(struct net_bridge *br)
636{
637}
638
639static inline void br_multicast_stop(struct net_bridge *br)
640{
641}
642
643static inline void br_multicast_dev_del(struct net_bridge *br)
644{
645}
646
647static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
648 struct sk_buff *skb)
649{
650}
651
652static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
653 struct sk_buff *skb,
654 struct sk_buff *skb2)
655{
656}
657static inline bool br_multicast_is_router(struct net_bridge *br)
658{
659 return 0;
660}
661static inline bool br_multicast_querier_exists(struct net_bridge *br,
662 struct ethhdr *eth)
663{
664 return false;
665}
666static inline void br_mdb_init(void)
667{
668}
669static inline void br_mdb_uninit(void)
670{
671}
672#endif
673
674/* br_vlan.c */
675#ifdef CONFIG_BRIDGE_VLAN_FILTERING
676bool br_allowed_ingress(const struct net_bridge *br,
677 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
678 u16 *vid);
679bool br_allowed_egress(struct net_bridge_vlan_group *vg,
680 const struct sk_buff *skb);
681bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
682struct sk_buff *br_handle_vlan(struct net_bridge *br,
683 struct net_bridge_vlan_group *vg,
684 struct sk_buff *skb);
685int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
686int br_vlan_delete(struct net_bridge *br, u16 vid);
687void br_vlan_flush(struct net_bridge *br);
688struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
689void br_recalculate_fwd_mask(struct net_bridge *br);
690int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
691int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
692int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
693int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
694int br_vlan_init(struct net_bridge *br);
695int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
696int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
697int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
698int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
699void nbp_vlan_flush(struct net_bridge_port *port);
700int nbp_vlan_init(struct net_bridge_port *port);
701int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
702
703static inline struct net_bridge_vlan_group *br_vlan_group(
704 const struct net_bridge *br)
705{
706 return rtnl_dereference(br->vlgrp);
707}
708
709static inline struct net_bridge_vlan_group *nbp_vlan_group(
710 const struct net_bridge_port *p)
711{
712 return rtnl_dereference(p->vlgrp);
713}
714
715static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
716 const struct net_bridge *br)
717{
718 return rcu_dereference(br->vlgrp);
719}
720
721static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
722 const struct net_bridge_port *p)
723{
724 return rcu_dereference(p->vlgrp);
725}
726
727/* Since bridge now depends on 8021Q module, but the time bridge sees the
728 * skb, the vlan tag will always be present if the frame was tagged.
729 */
730static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
731{
732 int err = 0;
733
734 if (skb_vlan_tag_present(skb)) {
735 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
736 } else {
737 *vid = 0;
738 err = -EINVAL;
739 }
740
741 return err;
742}
743
744static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
745{
746 if (!vg)
747 return 0;
748
749 smp_rmb();
750 return vg->pvid;
751}
752
753static inline int br_vlan_enabled(struct net_bridge *br)
754{
755 return br->vlan_enabled;
756}
757#else
758static inline bool br_allowed_ingress(const struct net_bridge *br,
759 struct net_bridge_vlan_group *vg,
760 struct sk_buff *skb,
761 u16 *vid)
762{
763 return true;
764}
765
766static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
767 const struct sk_buff *skb)
768{
769 return true;
770}
771
772static inline bool br_should_learn(struct net_bridge_port *p,
773 struct sk_buff *skb, u16 *vid)
774{
775 return true;
776}
777
778static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
779 struct net_bridge_vlan_group *vg,
780 struct sk_buff *skb)
781{
782 return skb;
783}
784
785static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
786{
787 return -EOPNOTSUPP;
788}
789
790static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
791{
792 return -EOPNOTSUPP;
793}
794
795static inline void br_vlan_flush(struct net_bridge *br)
796{
797}
798
799static inline void br_recalculate_fwd_mask(struct net_bridge *br)
800{
801}
802
803static inline int br_vlan_init(struct net_bridge *br)
804{
805 return 0;
806}
807
808static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
809{
810 return -EOPNOTSUPP;
811}
812
813static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
814{
815 return -EOPNOTSUPP;
816}
817
818static inline void nbp_vlan_flush(struct net_bridge_port *port)
819{
820}
821
822static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
823 u16 vid)
824{
825 return NULL;
826}
827
828static inline int nbp_vlan_init(struct net_bridge_port *port)
829{
830 return 0;
831}
832
833static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
834{
835 return 0;
836}
837
838static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
839{
840 return 0;
841}
842
843static inline int br_vlan_enabled(struct net_bridge *br)
844{
845 return 0;
846}
847
848static inline int __br_vlan_filter_toggle(struct net_bridge *br,
849 unsigned long val)
850{
851 return -EOPNOTSUPP;
852}
853
854static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
855 u32 filter_mask)
856{
857 return 0;
858}
859
860static inline struct net_bridge_vlan_group *br_vlan_group(
861 const struct net_bridge *br)
862{
863 return NULL;
864}
865
866static inline struct net_bridge_vlan_group *nbp_vlan_group(
867 const struct net_bridge_port *p)
868{
869 return NULL;
870}
871
872static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
873 const struct net_bridge *br)
874{
875 return NULL;
876}
877
878static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
879 const struct net_bridge_port *p)
880{
881 return NULL;
882}
883
884#endif
885
886struct nf_br_ops {
887 int (*br_dev_xmit_hook)(struct sk_buff *skb);
888};
889extern const struct nf_br_ops __rcu *nf_br_ops;
890
891/* br_netfilter.c */
892#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
893int br_nf_core_init(void);
894void br_nf_core_fini(void);
895void br_netfilter_rtable_init(struct net_bridge *);
896#else
897static inline int br_nf_core_init(void) { return 0; }
898static inline void br_nf_core_fini(void) {}
899#define br_netfilter_rtable_init(x)
900#endif
901
902/* br_stp.c */
903void br_set_state(struct net_bridge_port *p, unsigned int state);
904struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
905void br_init_port(struct net_bridge_port *p);
906void br_become_designated_port(struct net_bridge_port *p);
907
908void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
909int br_set_forward_delay(struct net_bridge *br, unsigned long x);
910int br_set_hello_time(struct net_bridge *br, unsigned long x);
911int br_set_max_age(struct net_bridge *br, unsigned long x);
912int br_set_ageing_time(struct net_bridge *br, u32 ageing_time);
913
914
915/* br_stp_if.c */
916void br_stp_enable_bridge(struct net_bridge *br);
917void br_stp_disable_bridge(struct net_bridge *br);
918void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
919void br_stp_enable_port(struct net_bridge_port *p);
920void br_stp_disable_port(struct net_bridge_port *p);
921bool br_stp_recalculate_bridge_id(struct net_bridge *br);
922void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
923void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
924int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
925int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
926ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
927
928/* br_stp_bpdu.c */
929struct stp_proto;
930void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
931 struct net_device *dev);
932
933/* br_stp_timer.c */
934void br_stp_timer_init(struct net_bridge *br);
935void br_stp_port_timer_init(struct net_bridge_port *p);
936unsigned long br_timer_value(const struct timer_list *timer);
937
938/* br.c */
939#if IS_ENABLED(CONFIG_ATM_LANE)
940extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
941#endif
942
943/* br_netlink.c */
944extern struct rtnl_link_ops br_link_ops;
945int br_netlink_init(void);
946void br_netlink_fini(void);
947void br_ifinfo_notify(int event, struct net_bridge_port *port);
948int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
949int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
950int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
951 u32 filter_mask, int nlflags);
952
953#ifdef CONFIG_SYSFS
954/* br_sysfs_if.c */
955extern const struct sysfs_ops brport_sysfs_ops;
956int br_sysfs_addif(struct net_bridge_port *p);
957int br_sysfs_renameif(struct net_bridge_port *p);
958
959/* br_sysfs_br.c */
960int br_sysfs_addbr(struct net_device *dev);
961void br_sysfs_delbr(struct net_device *dev);
962
963#else
964
965static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
966static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
967static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
968static inline void br_sysfs_delbr(struct net_device *dev) { return; }
969#endif /* CONFIG_SYSFS */
970
971#endif
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
42typedef struct bridge_id bridge_id;
43typedef struct mac_addr mac_addr;
44typedef __u16 port_id;
45
46struct bridge_id
47{
48 unsigned char prio[2];
49 unsigned char addr[ETH_ALEN];
50};
51
52struct mac_addr
53{
54 unsigned char addr[ETH_ALEN];
55};
56
57struct 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 */
71struct bridge_mcast_query {
72 struct timer_list timer;
73 u32 startup_sent;
74};
75
76/* other querier */
77struct bridge_mcast_querier {
78 struct timer_list timer;
79 unsigned long delay_time;
80};
81#endif
82
83struct 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
96struct 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
111struct 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
121struct 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
132struct 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
143struct 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
203static 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
208static 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
214struct 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
299struct 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
330extern struct notifier_block br_device_notifier;
331
332/* called under bridge lock */
333static 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 */
339void br_dev_setup(struct net_device *dev);
340void br_dev_delete(struct net_device *dev, struct list_head *list);
341netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
342#ifdef CONFIG_NET_POLL_CONTROLLER
343static 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
352int br_netpoll_enable(struct net_bridge_port *p);
353void br_netpoll_disable(struct net_bridge_port *p);
354#else
355static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
356 struct sk_buff *skb)
357{
358}
359
360static inline int br_netpoll_enable(struct net_bridge_port *p)
361{
362 return 0;
363}
364
365static inline void br_netpoll_disable(struct net_bridge_port *p)
366{
367}
368#endif
369
370/* br_fdb.c */
371int br_fdb_init(void);
372void br_fdb_fini(void);
373void br_fdb_flush(struct net_bridge *br);
374void br_fdb_find_delete_local(struct net_bridge *br,
375 const struct net_bridge_port *p,
376 const unsigned char *addr, u16 vid);
377void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
378void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
379void br_fdb_cleanup(unsigned long arg);
380void br_fdb_delete_by_port(struct net_bridge *br,
381 const struct net_bridge_port *p, int do_all);
382struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
383 const unsigned char *addr, __u16 vid);
384int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
385int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
386 unsigned long off);
387int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
388 const unsigned char *addr, u16 vid);
389void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
390 const unsigned char *addr, u16 vid, bool added_by_user);
391
392int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
393 struct net_device *dev, const unsigned char *addr);
394int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
395 const unsigned char *addr, u16 nlh_flags);
396int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
397 struct net_device *dev, int idx);
398
399/* br_forward.c */
400void br_deliver(const struct net_bridge_port *to, struct sk_buff *skb);
401int br_dev_queue_push_xmit(struct sk_buff *skb);
402void br_forward(const struct net_bridge_port *to,
403 struct sk_buff *skb, struct sk_buff *skb0);
404int br_forward_finish(struct sk_buff *skb);
405void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb, bool unicast);
406void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
407 struct sk_buff *skb2, bool unicast);
408
409/* br_if.c */
410void br_port_carrier_check(struct net_bridge_port *p);
411int br_add_bridge(struct net *net, const char *name);
412int br_del_bridge(struct net *net, const char *name);
413int br_add_if(struct net_bridge *br, struct net_device *dev);
414int br_del_if(struct net_bridge *br, struct net_device *dev);
415int br_min_mtu(const struct net_bridge *br);
416netdev_features_t br_features_recompute(struct net_bridge *br,
417 netdev_features_t features);
418
419/* br_input.c */
420int br_handle_frame_finish(struct sk_buff *skb);
421rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
422
423static 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
428static 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 */
434int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
435int 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
440extern unsigned int br_mdb_rehash_seq;
441int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
442 struct sk_buff *skb, u16 vid);
443struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
444 struct sk_buff *skb, u16 vid);
445void br_multicast_add_port(struct net_bridge_port *port);
446void br_multicast_del_port(struct net_bridge_port *port);
447void br_multicast_enable_port(struct net_bridge_port *port);
448void br_multicast_disable_port(struct net_bridge_port *port);
449void br_multicast_init(struct net_bridge *br);
450void br_multicast_open(struct net_bridge *br);
451void br_multicast_stop(struct net_bridge *br);
452void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
453 struct sk_buff *skb);
454void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
455 struct sk_buff *skb, struct sk_buff *skb2);
456int br_multicast_set_router(struct net_bridge *br, unsigned long val);
457int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
458int br_multicast_toggle(struct net_bridge *br, unsigned long val);
459int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
460int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
461struct net_bridge_mdb_entry *
462br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
463struct net_bridge_mdb_entry *
464br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
465 struct br_ip *group);
466void br_multicast_free_pg(struct rcu_head *head);
467struct net_bridge_port_group *
468br_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);
471void br_mdb_init(void);
472void br_mdb_uninit(void);
473void 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
479static 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
486static 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
494static 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
509static 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
517static 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
523static inline void br_multicast_add_port(struct net_bridge_port *port)
524{
525}
526
527static inline void br_multicast_del_port(struct net_bridge_port *port)
528{
529}
530
531static inline void br_multicast_enable_port(struct net_bridge_port *port)
532{
533}
534
535static inline void br_multicast_disable_port(struct net_bridge_port *port)
536{
537}
538
539static inline void br_multicast_init(struct net_bridge *br)
540{
541}
542
543static inline void br_multicast_open(struct net_bridge *br)
544{
545}
546
547static inline void br_multicast_stop(struct net_bridge *br)
548{
549}
550
551static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
552 struct sk_buff *skb)
553{
554}
555
556static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
557 struct sk_buff *skb,
558 struct sk_buff *skb2)
559{
560}
561static inline bool br_multicast_is_router(struct net_bridge *br)
562{
563 return 0;
564}
565static inline bool br_multicast_querier_exists(struct net_bridge *br,
566 struct ethhdr *eth)
567{
568 return false;
569}
570static inline void br_mdb_init(void)
571{
572}
573static inline void br_mdb_uninit(void)
574{
575}
576#endif
577
578/* br_vlan.c */
579#ifdef CONFIG_BRIDGE_VLAN_FILTERING
580bool br_allowed_ingress(struct net_bridge *br, struct net_port_vlans *v,
581 struct sk_buff *skb, u16 *vid);
582bool br_allowed_egress(struct net_bridge *br, const struct net_port_vlans *v,
583 const struct sk_buff *skb);
584bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
585struct sk_buff *br_handle_vlan(struct net_bridge *br,
586 const struct net_port_vlans *v,
587 struct sk_buff *skb);
588int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
589int br_vlan_delete(struct net_bridge *br, u16 vid);
590void br_vlan_flush(struct net_bridge *br);
591bool br_vlan_find(struct net_bridge *br, u16 vid);
592int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
593int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
594int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
595void nbp_vlan_flush(struct net_bridge_port *port);
596bool nbp_vlan_find(struct net_bridge_port *port, u16 vid);
597
598static inline struct net_port_vlans *br_get_vlan_info(
599 const struct net_bridge *br)
600{
601 return rcu_dereference_rtnl(br->vlan_info);
602}
603
604static inline struct net_port_vlans *nbp_get_vlan_info(
605 const struct net_bridge_port *p)
606{
607 return rcu_dereference_rtnl(p->vlan_info);
608}
609
610/* Since bridge now depends on 8021Q module, but the time bridge sees the
611 * skb, the vlan tag will always be present if the frame was tagged.
612 */
613static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
614{
615 int err = 0;
616
617 if (vlan_tx_tag_present(skb))
618 *vid = vlan_tx_tag_get(skb) & VLAN_VID_MASK;
619 else {
620 *vid = 0;
621 err = -EINVAL;
622 }
623
624 return err;
625}
626
627static inline u16 br_get_pvid(const struct net_port_vlans *v)
628{
629 /* Return just the VID if it is set, or VLAN_N_VID (invalid vid) if
630 * vid wasn't set
631 */
632 smp_rmb();
633 return v->pvid ?: VLAN_N_VID;
634}
635
636#else
637static inline bool br_allowed_ingress(struct net_bridge *br,
638 struct net_port_vlans *v,
639 struct sk_buff *skb,
640 u16 *vid)
641{
642 return true;
643}
644
645static inline bool br_allowed_egress(struct net_bridge *br,
646 const struct net_port_vlans *v,
647 const struct sk_buff *skb)
648{
649 return true;
650}
651
652static inline bool br_should_learn(struct net_bridge_port *p,
653 struct sk_buff *skb, u16 *vid)
654{
655 return true;
656}
657
658static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
659 const struct net_port_vlans *v,
660 struct sk_buff *skb)
661{
662 return skb;
663}
664
665static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
666{
667 return -EOPNOTSUPP;
668}
669
670static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
671{
672 return -EOPNOTSUPP;
673}
674
675static inline void br_vlan_flush(struct net_bridge *br)
676{
677}
678
679static inline bool br_vlan_find(struct net_bridge *br, u16 vid)
680{
681 return false;
682}
683
684static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
685{
686 return -EOPNOTSUPP;
687}
688
689static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
690{
691 return -EOPNOTSUPP;
692}
693
694static inline void nbp_vlan_flush(struct net_bridge_port *port)
695{
696}
697
698static inline struct net_port_vlans *br_get_vlan_info(
699 const struct net_bridge *br)
700{
701 return NULL;
702}
703static inline struct net_port_vlans *nbp_get_vlan_info(
704 const struct net_bridge_port *p)
705{
706 return NULL;
707}
708
709static inline bool nbp_vlan_find(struct net_bridge_port *port, u16 vid)
710{
711 return false;
712}
713
714static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
715{
716 return 0;
717}
718static inline u16 br_get_pvid(const struct net_port_vlans *v)
719{
720 return VLAN_N_VID; /* Returns invalid vid */
721}
722#endif
723
724/* br_netfilter.c */
725#ifdef CONFIG_BRIDGE_NETFILTER
726int br_netfilter_init(void);
727void br_netfilter_fini(void);
728void br_netfilter_rtable_init(struct net_bridge *);
729#else
730#define br_netfilter_init() (0)
731#define br_netfilter_fini() do { } while (0)
732#define br_netfilter_rtable_init(x)
733#endif
734
735/* br_stp.c */
736void br_log_state(const struct net_bridge_port *p);
737struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
738void br_init_port(struct net_bridge_port *p);
739void br_become_designated_port(struct net_bridge_port *p);
740
741void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
742int br_set_forward_delay(struct net_bridge *br, unsigned long x);
743int br_set_hello_time(struct net_bridge *br, unsigned long x);
744int br_set_max_age(struct net_bridge *br, unsigned long x);
745
746
747/* br_stp_if.c */
748void br_stp_enable_bridge(struct net_bridge *br);
749void br_stp_disable_bridge(struct net_bridge *br);
750void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
751void br_stp_enable_port(struct net_bridge_port *p);
752void br_stp_disable_port(struct net_bridge_port *p);
753bool br_stp_recalculate_bridge_id(struct net_bridge *br);
754void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
755void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
756int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
757int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
758ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
759
760/* br_stp_bpdu.c */
761struct stp_proto;
762void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
763 struct net_device *dev);
764
765/* br_stp_timer.c */
766void br_stp_timer_init(struct net_bridge *br);
767void br_stp_port_timer_init(struct net_bridge_port *p);
768unsigned long br_timer_value(const struct timer_list *timer);
769
770/* br.c */
771#if IS_ENABLED(CONFIG_ATM_LANE)
772extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
773#endif
774
775/* br_netlink.c */
776extern struct rtnl_link_ops br_link_ops;
777int br_netlink_init(void);
778void br_netlink_fini(void);
779void br_ifinfo_notify(int event, struct net_bridge_port *port);
780int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg);
781int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg);
782int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
783 u32 filter_mask);
784
785#ifdef CONFIG_SYSFS
786/* br_sysfs_if.c */
787extern const struct sysfs_ops brport_sysfs_ops;
788int br_sysfs_addif(struct net_bridge_port *p);
789int br_sysfs_renameif(struct net_bridge_port *p);
790
791/* br_sysfs_br.c */
792int br_sysfs_addbr(struct net_device *dev);
793void br_sysfs_delbr(struct net_device *dev);
794
795#else
796
797static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
798static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
799static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
800static inline void br_sysfs_delbr(struct net_device *dev) { return; }
801#endif /* CONFIG_SYSFS */
802
803#endif