1 /*
2 * Linux ethernet bridge
3 *
4 * Authors:
5 * Lennert Buytenhek <buytenh@gnu.org>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
11 */
12
13 #ifndef _BR_PRIVATE_H
14 #define _BR_PRIVATE_H
15
16 #include <linux/netdevice.h>
17 #include <linux/if_bridge.h>
18 #include <linux/netpoll.h>
19 #include <linux/u64_stats_sync.h>
20 #include <net/route.h>
21 #include <net/ip6_fib.h>
22 #include <linux/if_vlan.h>
23 #include <linux/rhashtable.h>
24
25 #define BR_HASH_BITS 8
26 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
27
28 #define BR_HOLD_TIME (1*HZ)
29
30 #define BR_PORT_BITS 10
31 #define BR_MAX_PORTS (1<<BR_PORT_BITS)
32
33 #define BR_VERSION "2.3"
34
35 /* Control of forwarding link local multicast */
36 #define BR_GROUPFWD_DEFAULT 0
37 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
38 #define BR_GROUPFWD_RESTRICTED 0x0007u
39 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
40 #define BR_GROUPFWD_8021AD 0xB801u
41
42 /* Path to usermode spanning tree program */
43 #define BR_STP_PROG "/sbin/bridge-stp"
44
45 typedef struct bridge_id bridge_id;
46 typedef struct mac_addr mac_addr;
47 typedef __u16 port_id;
48
49 struct bridge_id
50 {
51 unsigned char prio[2];
52 unsigned char addr[ETH_ALEN];
53 };
54
55 struct mac_addr
56 {
57 unsigned char addr[ETH_ALEN];
58 };
59
60 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
61 /* our own querier */
62 struct bridge_mcast_own_query {
63 struct timer_list timer;
64 u32 startup_sent;
65 };
66
67 /* other querier */
68 struct bridge_mcast_other_query {
69 struct timer_list timer;
70 unsigned long delay_time;
71 };
72
73 /* selected querier */
74 struct bridge_mcast_querier {
75 struct br_ip addr;
76 struct net_bridge_port __rcu *port;
77 };
78
79 /* IGMP/MLD statistics */
80 struct bridge_mcast_stats {
81 struct br_mcast_stats mstats;
82 struct u64_stats_sync syncp;
83 };
84 #endif
85
86 struct br_vlan_stats {
87 u64 rx_bytes;
88 u64 rx_packets;
89 u64 tx_bytes;
90 u64 tx_packets;
91 struct u64_stats_sync syncp;
92 };
93
94 /**
95 * struct net_bridge_vlan - per-vlan entry
96 *
97 * @vnode: rhashtable member
98 * @vid: VLAN id
99 * @flags: bridge vlan flags
100 * @stats: per-cpu VLAN statistics
101 * @br: if MASTER flag set, this points to a bridge struct
102 * @port: if MASTER flag unset, this points to a port struct
103 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
104 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
105 * for this VLAN entry
106 * @vlist: sorted list of VLAN entries
107 * @rcu: used for entry destruction
108 *
109 * This structure is shared between the global per-VLAN entries contained in
110 * the bridge rhashtable and the local per-port per-VLAN entries contained in
111 * the port's rhashtable. The union entries should be interpreted depending on
112 * the entry flags that are set.
113 */
114 struct net_bridge_vlan {
115 struct rhash_head vnode;
116 u16 vid;
117 u16 flags;
118 struct br_vlan_stats __percpu *stats;
119 union {
120 struct net_bridge *br;
121 struct net_bridge_port *port;
122 };
123 union {
124 atomic_t refcnt;
125 struct net_bridge_vlan *brvlan;
126 };
127 struct list_head vlist;
128
129 struct rcu_head rcu;
130 };
131
132 /**
133 * struct net_bridge_vlan_group
134 *
135 * @vlan_hash: VLAN entry rhashtable
136 * @vlan_list: sorted VLAN entry list
137 * @num_vlans: number of total VLAN entries
138 * @pvid: PVID VLAN id
139 *
140 * IMPORTANT: Be careful when checking if there're VLAN entries using list
141 * primitives because the bridge can have entries in its list which
142 * are just for global context but not for filtering, i.e. they have
143 * the master flag set but not the brentry flag. If you have to check
144 * if there're "real" entries in the bridge please test @num_vlans
145 */
146 struct net_bridge_vlan_group {
147 struct rhashtable vlan_hash;
148 struct list_head vlan_list;
149 u16 num_vlans;
150 u16 pvid;
151 };
152
153 struct net_bridge_fdb_entry
154 {
155 struct hlist_node hlist;
156 struct net_bridge_port *dst;
157
158 unsigned long updated;
159 unsigned long used;
160 mac_addr addr;
161 __u16 vlan_id;
162 unsigned char is_local:1,
163 is_static:1,
164 added_by_user:1,
165 added_by_external_learn:1;
166 struct rcu_head rcu;
167 };
168
169 #define MDB_PG_FLAGS_PERMANENT BIT(0)
170 #define MDB_PG_FLAGS_OFFLOAD BIT(1)
171
172 struct net_bridge_port_group {
173 struct net_bridge_port *port;
174 struct net_bridge_port_group __rcu *next;
175 struct hlist_node mglist;
176 struct rcu_head rcu;
177 struct timer_list timer;
178 struct br_ip addr;
179 unsigned char flags;
180 };
181
182 struct net_bridge_mdb_entry
183 {
184 struct hlist_node hlist[2];
185 struct net_bridge *br;
186 struct net_bridge_port_group __rcu *ports;
187 struct rcu_head rcu;
188 struct timer_list timer;
189 struct br_ip addr;
190 bool mglist;
191 };
192
193 struct net_bridge_mdb_htable
194 {
195 struct hlist_head *mhash;
196 struct rcu_head rcu;
197 struct net_bridge_mdb_htable *old;
198 u32 size;
199 u32 max;
200 u32 secret;
201 u32 ver;
202 };
203
204 struct net_bridge_port
205 {
206 struct net_bridge *br;
207 struct net_device *dev;
208 struct list_head list;
209
210 /* STP */
211 u8 priority;
212 u8 state;
213 u16 port_no;
214 unsigned char topology_change_ack;
215 unsigned char config_pending;
216 port_id port_id;
217 port_id designated_port;
218 bridge_id designated_root;
219 bridge_id designated_bridge;
220 u32 path_cost;
221 u32 designated_cost;
222 unsigned long designated_age;
223
224 struct timer_list forward_delay_timer;
225 struct timer_list hold_timer;
226 struct timer_list message_age_timer;
227 struct kobject kobj;
228 struct rcu_head rcu;
229
230 unsigned long flags;
231
232 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
233 struct bridge_mcast_own_query ip4_own_query;
234 #if IS_ENABLED(CONFIG_IPV6)
235 struct bridge_mcast_own_query ip6_own_query;
236 #endif /* IS_ENABLED(CONFIG_IPV6) */
237 unsigned char multicast_router;
238 struct bridge_mcast_stats __percpu *mcast_stats;
239 struct timer_list multicast_router_timer;
240 struct hlist_head mglist;
241 struct hlist_node rlist;
242 #endif
243
244 #ifdef CONFIG_SYSFS
245 char sysfs_name[IFNAMSIZ];
246 #endif
247
248 #ifdef CONFIG_NET_POLL_CONTROLLER
249 struct netpoll *np;
250 #endif
251 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
252 struct net_bridge_vlan_group __rcu *vlgrp;
253 #endif
254 #ifdef CONFIG_NET_SWITCHDEV
255 int offload_fwd_mark;
256 #endif
257 };
258
259 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
260 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
261
262 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
263
br_port_get_rcu(const struct net_device * dev)264 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
265 {
266 return rcu_dereference(dev->rx_handler_data);
267 }
268
br_port_get_rtnl(const struct net_device * dev)269 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
270 {
271 return br_port_exists(dev) ?
272 rtnl_dereference(dev->rx_handler_data) : NULL;
273 }
274
275 struct net_bridge
276 {
277 spinlock_t lock;
278 struct list_head port_list;
279 struct net_device *dev;
280
281 struct pcpu_sw_netstats __percpu *stats;
282 spinlock_t hash_lock;
283 struct hlist_head hash[BR_HASH_SIZE];
284 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
285 union {
286 struct rtable fake_rtable;
287 struct rt6_info fake_rt6_info;
288 };
289 bool nf_call_iptables;
290 bool nf_call_ip6tables;
291 bool nf_call_arptables;
292 #endif
293 u16 group_fwd_mask;
294 u16 group_fwd_mask_required;
295
296 /* STP */
297 bridge_id designated_root;
298 bridge_id bridge_id;
299 u32 root_path_cost;
300 unsigned long max_age;
301 unsigned long hello_time;
302 unsigned long forward_delay;
303 unsigned long bridge_max_age;
304 unsigned long ageing_time;
305 unsigned long bridge_hello_time;
306 unsigned long bridge_forward_delay;
307
308 u8 group_addr[ETH_ALEN];
309 bool group_addr_set;
310 u16 root_port;
311
312 enum {
313 BR_NO_STP, /* no spanning tree */
314 BR_KERNEL_STP, /* old STP in kernel */
315 BR_USER_STP, /* new RSTP in userspace */
316 } stp_enabled;
317
318 unsigned char topology_change;
319 unsigned char topology_change_detected;
320
321 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
322 unsigned char multicast_router;
323
324 u8 multicast_disabled:1;
325 u8 multicast_querier:1;
326 u8 multicast_query_use_ifaddr:1;
327 u8 has_ipv6_addr:1;
328 u8 multicast_stats_enabled:1;
329
330 u32 hash_elasticity;
331 u32 hash_max;
332
333 u32 multicast_last_member_count;
334 u32 multicast_startup_query_count;
335
336 unsigned long multicast_last_member_interval;
337 unsigned long multicast_membership_interval;
338 unsigned long multicast_querier_interval;
339 unsigned long multicast_query_interval;
340 unsigned long multicast_query_response_interval;
341 unsigned long multicast_startup_query_interval;
342
343 spinlock_t multicast_lock;
344 struct net_bridge_mdb_htable __rcu *mdb;
345 struct hlist_head router_list;
346
347 struct timer_list multicast_router_timer;
348 struct bridge_mcast_other_query ip4_other_query;
349 struct bridge_mcast_own_query ip4_own_query;
350 struct bridge_mcast_querier ip4_querier;
351 struct bridge_mcast_stats __percpu *mcast_stats;
352 #if IS_ENABLED(CONFIG_IPV6)
353 struct bridge_mcast_other_query ip6_other_query;
354 struct bridge_mcast_own_query ip6_own_query;
355 struct bridge_mcast_querier ip6_querier;
356 #endif /* IS_ENABLED(CONFIG_IPV6) */
357 #endif
358
359 struct timer_list hello_timer;
360 struct timer_list tcn_timer;
361 struct timer_list topology_change_timer;
362 struct timer_list gc_timer;
363 struct kobject *ifobj;
364 u32 auto_cnt;
365
366 #ifdef CONFIG_NET_SWITCHDEV
367 int offload_fwd_mark;
368 #endif
369
370 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
371 struct net_bridge_vlan_group __rcu *vlgrp;
372 u8 vlan_enabled;
373 u8 vlan_stats_enabled;
374 __be16 vlan_proto;
375 u16 default_pvid;
376 #endif
377 };
378
379 struct br_input_skb_cb {
380 struct net_device *brdev;
381
382 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
383 int igmp;
384 int mrouters_only;
385 #endif
386
387 bool proxyarp_replied;
388
389 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
390 bool vlan_filtered;
391 #endif
392
393 #ifdef CONFIG_NET_SWITCHDEV
394 int offload_fwd_mark;
395 #endif
396 };
397
398 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
399
400 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
401 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
402 #else
403 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
404 #endif
405
406 #define br_printk(level, br, format, args...) \
407 printk(level "%s: " format, (br)->dev->name, ##args)
408
409 #define br_err(__br, format, args...) \
410 br_printk(KERN_ERR, __br, format, ##args)
411 #define br_warn(__br, format, args...) \
412 br_printk(KERN_WARNING, __br, format, ##args)
413 #define br_notice(__br, format, args...) \
414 br_printk(KERN_NOTICE, __br, format, ##args)
415 #define br_info(__br, format, args...) \
416 br_printk(KERN_INFO, __br, format, ##args)
417
418 #define br_debug(br, format, args...) \
419 pr_debug("%s: " format, (br)->dev->name, ##args)
420
421 /* called under bridge lock */
br_is_root_bridge(const struct net_bridge * br)422 static inline int br_is_root_bridge(const struct net_bridge *br)
423 {
424 return !memcmp(&br->bridge_id, &br->designated_root, 8);
425 }
426
427 /* check if a VLAN entry is global */
br_vlan_is_master(const struct net_bridge_vlan * v)428 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
429 {
430 return v->flags & BRIDGE_VLAN_INFO_MASTER;
431 }
432
433 /* check if a VLAN entry is used by the bridge */
br_vlan_is_brentry(const struct net_bridge_vlan * v)434 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
435 {
436 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
437 }
438
439 /* check if we should use the vlan entry, returns false if it's only context */
br_vlan_should_use(const struct net_bridge_vlan * v)440 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
441 {
442 if (br_vlan_is_master(v)) {
443 if (br_vlan_is_brentry(v))
444 return true;
445 else
446 return false;
447 }
448
449 return true;
450 }
451
452 /* br_device.c */
453 void br_dev_setup(struct net_device *dev);
454 void br_dev_delete(struct net_device *dev, struct list_head *list);
455 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
456 #ifdef CONFIG_NET_POLL_CONTROLLER
br_netpoll_send_skb(const struct net_bridge_port * p,struct sk_buff * skb)457 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
458 struct sk_buff *skb)
459 {
460 struct netpoll *np = p->np;
461
462 if (np)
463 netpoll_send_skb(np, skb);
464 }
465
466 int br_netpoll_enable(struct net_bridge_port *p);
467 void br_netpoll_disable(struct net_bridge_port *p);
468 #else
br_netpoll_send_skb(const struct net_bridge_port * p,struct sk_buff * skb)469 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
470 struct sk_buff *skb)
471 {
472 }
473
br_netpoll_enable(struct net_bridge_port * p)474 static inline int br_netpoll_enable(struct net_bridge_port *p)
475 {
476 return 0;
477 }
478
br_netpoll_disable(struct net_bridge_port * p)479 static inline void br_netpoll_disable(struct net_bridge_port *p)
480 {
481 }
482 #endif
483
484 /* br_fdb.c */
485 int br_fdb_init(void);
486 void br_fdb_fini(void);
487 void br_fdb_flush(struct net_bridge *br);
488 void br_fdb_find_delete_local(struct net_bridge *br,
489 const struct net_bridge_port *p,
490 const unsigned char *addr, u16 vid);
491 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
492 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
493 void br_fdb_cleanup(unsigned long arg);
494 void br_fdb_delete_by_port(struct net_bridge *br,
495 const struct net_bridge_port *p, u16 vid, int do_all);
496 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
497 const unsigned char *addr, __u16 vid);
498 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
499 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
500 unsigned long off);
501 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
502 const unsigned char *addr, u16 vid);
503 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
504 const unsigned char *addr, u16 vid, bool added_by_user);
505
506 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
507 struct net_device *dev, const unsigned char *addr, u16 vid);
508 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
509 const unsigned char *addr, u16 vid, u16 nlh_flags);
510 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
511 struct net_device *dev, struct net_device *fdev, int *idx);
512 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
513 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
514 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
515 const unsigned char *addr, u16 vid);
516 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
517 const unsigned char *addr, u16 vid);
518
519 /* br_forward.c */
520 enum br_pkt_type {
521 BR_PKT_UNICAST,
522 BR_PKT_MULTICAST,
523 BR_PKT_BROADCAST
524 };
525 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
526 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
527 bool local_rcv, bool local_orig);
528 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
529 void br_flood(struct net_bridge *br, struct sk_buff *skb,
530 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
531
532 /* br_if.c */
533 void br_port_carrier_check(struct net_bridge_port *p);
534 int br_add_bridge(struct net *net, const char *name);
535 int br_del_bridge(struct net *net, const char *name);
536 int br_add_if(struct net_bridge *br, struct net_device *dev);
537 int br_del_if(struct net_bridge *br, struct net_device *dev);
538 int br_min_mtu(const struct net_bridge *br);
539 netdev_features_t br_features_recompute(struct net_bridge *br,
540 netdev_features_t features);
541 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
542 void br_manage_promisc(struct net_bridge *br);
543
544 /* br_input.c */
545 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
546 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
547
br_rx_handler_check_rcu(const struct net_device * dev)548 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
549 {
550 return rcu_dereference(dev->rx_handler) == br_handle_frame;
551 }
552
br_port_get_check_rcu(const struct net_device * dev)553 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
554 {
555 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
556 }
557
558 /* br_ioctl.c */
559 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
560 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
561 void __user *arg);
562
563 /* br_multicast.c */
564 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
565 extern unsigned int br_mdb_rehash_seq;
566 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
567 struct sk_buff *skb, u16 vid);
568 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
569 struct sk_buff *skb, u16 vid);
570 int br_multicast_add_port(struct net_bridge_port *port);
571 void br_multicast_del_port(struct net_bridge_port *port);
572 void br_multicast_enable_port(struct net_bridge_port *port);
573 void br_multicast_disable_port(struct net_bridge_port *port);
574 void br_multicast_init(struct net_bridge *br);
575 void br_multicast_open(struct net_bridge *br);
576 void br_multicast_stop(struct net_bridge *br);
577 void br_multicast_dev_del(struct net_bridge *br);
578 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
579 struct sk_buff *skb, bool local_rcv, bool local_orig);
580 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
581 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
582 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
583 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
584 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
585 struct net_bridge_mdb_entry *
586 br_mdb_ip_get(struct net_bridge_mdb_htable *mdb, struct br_ip *dst);
587 struct net_bridge_mdb_entry *
588 br_multicast_new_group(struct net_bridge *br, struct net_bridge_port *port,
589 struct br_ip *group);
590 void br_multicast_free_pg(struct rcu_head *head);
591 struct net_bridge_port_group *
592 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
593 struct net_bridge_port_group __rcu *next,
594 unsigned char flags);
595 void br_mdb_init(void);
596 void br_mdb_uninit(void);
597 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
598 struct br_ip *group, int type, u8 flags);
599 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
600 int type);
601 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
602 const struct sk_buff *skb, u8 type, u8 dir);
603 int br_multicast_init_stats(struct net_bridge *br);
604 void br_multicast_get_stats(const struct net_bridge *br,
605 const struct net_bridge_port *p,
606 struct br_mcast_stats *dest);
607
608 #define mlock_dereference(X, br) \
609 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
610
br_multicast_is_router(struct net_bridge * br)611 static inline bool br_multicast_is_router(struct net_bridge *br)
612 {
613 return br->multicast_router == 2 ||
614 (br->multicast_router == 1 &&
615 timer_pending(&br->multicast_router_timer));
616 }
617
618 static inline bool
__br_multicast_querier_exists(struct net_bridge * br,struct bridge_mcast_other_query * querier,const bool is_ipv6)619 __br_multicast_querier_exists(struct net_bridge *br,
620 struct bridge_mcast_other_query *querier,
621 const bool is_ipv6)
622 {
623 bool own_querier_enabled;
624
625 if (br->multicast_querier) {
626 if (is_ipv6 && !br->has_ipv6_addr)
627 own_querier_enabled = false;
628 else
629 own_querier_enabled = true;
630 } else {
631 own_querier_enabled = false;
632 }
633
634 return time_is_before_jiffies(querier->delay_time) &&
635 (own_querier_enabled || timer_pending(&querier->timer));
636 }
637
br_multicast_querier_exists(struct net_bridge * br,struct ethhdr * eth)638 static inline bool br_multicast_querier_exists(struct net_bridge *br,
639 struct ethhdr *eth)
640 {
641 switch (eth->h_proto) {
642 case (htons(ETH_P_IP)):
643 return __br_multicast_querier_exists(br,
644 &br->ip4_other_query, false);
645 #if IS_ENABLED(CONFIG_IPV6)
646 case (htons(ETH_P_IPV6)):
647 return __br_multicast_querier_exists(br,
648 &br->ip6_other_query, true);
649 #endif
650 default:
651 return false;
652 }
653 }
654
br_multicast_igmp_type(const struct sk_buff * skb)655 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
656 {
657 return BR_INPUT_SKB_CB(skb)->igmp;
658 }
659 #else
br_multicast_rcv(struct net_bridge * br,struct net_bridge_port * port,struct sk_buff * skb,u16 vid)660 static inline int br_multicast_rcv(struct net_bridge *br,
661 struct net_bridge_port *port,
662 struct sk_buff *skb,
663 u16 vid)
664 {
665 return 0;
666 }
667
br_mdb_get(struct net_bridge * br,struct sk_buff * skb,u16 vid)668 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
669 struct sk_buff *skb, u16 vid)
670 {
671 return NULL;
672 }
673
br_multicast_add_port(struct net_bridge_port * port)674 static inline int br_multicast_add_port(struct net_bridge_port *port)
675 {
676 return 0;
677 }
678
br_multicast_del_port(struct net_bridge_port * port)679 static inline void br_multicast_del_port(struct net_bridge_port *port)
680 {
681 }
682
br_multicast_enable_port(struct net_bridge_port * port)683 static inline void br_multicast_enable_port(struct net_bridge_port *port)
684 {
685 }
686
br_multicast_disable_port(struct net_bridge_port * port)687 static inline void br_multicast_disable_port(struct net_bridge_port *port)
688 {
689 }
690
br_multicast_init(struct net_bridge * br)691 static inline void br_multicast_init(struct net_bridge *br)
692 {
693 }
694
br_multicast_open(struct net_bridge * br)695 static inline void br_multicast_open(struct net_bridge *br)
696 {
697 }
698
br_multicast_stop(struct net_bridge * br)699 static inline void br_multicast_stop(struct net_bridge *br)
700 {
701 }
702
br_multicast_dev_del(struct net_bridge * br)703 static inline void br_multicast_dev_del(struct net_bridge *br)
704 {
705 }
706
br_multicast_flood(struct net_bridge_mdb_entry * mdst,struct sk_buff * skb,bool local_rcv,bool local_orig)707 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
708 struct sk_buff *skb,
709 bool local_rcv, bool local_orig)
710 {
711 }
712
br_multicast_is_router(struct net_bridge * br)713 static inline bool br_multicast_is_router(struct net_bridge *br)
714 {
715 return 0;
716 }
717
br_multicast_querier_exists(struct net_bridge * br,struct ethhdr * eth)718 static inline bool br_multicast_querier_exists(struct net_bridge *br,
719 struct ethhdr *eth)
720 {
721 return false;
722 }
723
br_mdb_init(void)724 static inline void br_mdb_init(void)
725 {
726 }
727
br_mdb_uninit(void)728 static inline void br_mdb_uninit(void)
729 {
730 }
731
br_multicast_count(struct net_bridge * br,const struct net_bridge_port * p,const struct sk_buff * skb,u8 type,u8 dir)732 static inline void br_multicast_count(struct net_bridge *br,
733 const struct net_bridge_port *p,
734 const struct sk_buff *skb,
735 u8 type, u8 dir)
736 {
737 }
738
br_multicast_init_stats(struct net_bridge * br)739 static inline int br_multicast_init_stats(struct net_bridge *br)
740 {
741 return 0;
742 }
743
br_multicast_igmp_type(const struct sk_buff * skb)744 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
745 {
746 return 0;
747 }
748 #endif
749
750 /* br_vlan.c */
751 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
752 bool br_allowed_ingress(const struct net_bridge *br,
753 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
754 u16 *vid);
755 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
756 const struct sk_buff *skb);
757 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
758 struct sk_buff *br_handle_vlan(struct net_bridge *br,
759 struct net_bridge_vlan_group *vg,
760 struct sk_buff *skb);
761 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags);
762 int br_vlan_delete(struct net_bridge *br, u16 vid);
763 void br_vlan_flush(struct net_bridge *br);
764 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
765 void br_recalculate_fwd_mask(struct net_bridge *br);
766 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
767 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
768 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
769 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
770 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
771 int br_vlan_init(struct net_bridge *br);
772 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
773 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid);
774 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags);
775 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
776 void nbp_vlan_flush(struct net_bridge_port *port);
777 int nbp_vlan_init(struct net_bridge_port *port);
778 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
779 void br_vlan_get_stats(const struct net_bridge_vlan *v,
780 struct br_vlan_stats *stats);
781
br_vlan_group(const struct net_bridge * br)782 static inline struct net_bridge_vlan_group *br_vlan_group(
783 const struct net_bridge *br)
784 {
785 return rtnl_dereference(br->vlgrp);
786 }
787
nbp_vlan_group(const struct net_bridge_port * p)788 static inline struct net_bridge_vlan_group *nbp_vlan_group(
789 const struct net_bridge_port *p)
790 {
791 return rtnl_dereference(p->vlgrp);
792 }
793
br_vlan_group_rcu(const struct net_bridge * br)794 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
795 const struct net_bridge *br)
796 {
797 return rcu_dereference(br->vlgrp);
798 }
799
nbp_vlan_group_rcu(const struct net_bridge_port * p)800 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
801 const struct net_bridge_port *p)
802 {
803 return rcu_dereference(p->vlgrp);
804 }
805
806 /* Since bridge now depends on 8021Q module, but the time bridge sees the
807 * skb, the vlan tag will always be present if the frame was tagged.
808 */
br_vlan_get_tag(const struct sk_buff * skb,u16 * vid)809 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
810 {
811 int err = 0;
812
813 if (skb_vlan_tag_present(skb)) {
814 *vid = skb_vlan_tag_get(skb) & VLAN_VID_MASK;
815 } else {
816 *vid = 0;
817 err = -EINVAL;
818 }
819
820 return err;
821 }
822
br_get_pvid(const struct net_bridge_vlan_group * vg)823 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
824 {
825 if (!vg)
826 return 0;
827
828 smp_rmb();
829 return vg->pvid;
830 }
831
br_vlan_enabled(struct net_bridge * br)832 static inline int br_vlan_enabled(struct net_bridge *br)
833 {
834 return br->vlan_enabled;
835 }
836 #else
br_allowed_ingress(const struct net_bridge * br,struct net_bridge_vlan_group * vg,struct sk_buff * skb,u16 * vid)837 static inline bool br_allowed_ingress(const struct net_bridge *br,
838 struct net_bridge_vlan_group *vg,
839 struct sk_buff *skb,
840 u16 *vid)
841 {
842 return true;
843 }
844
br_allowed_egress(struct net_bridge_vlan_group * vg,const struct sk_buff * skb)845 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
846 const struct sk_buff *skb)
847 {
848 return true;
849 }
850
br_should_learn(struct net_bridge_port * p,struct sk_buff * skb,u16 * vid)851 static inline bool br_should_learn(struct net_bridge_port *p,
852 struct sk_buff *skb, u16 *vid)
853 {
854 return true;
855 }
856
br_handle_vlan(struct net_bridge * br,struct net_bridge_vlan_group * vg,struct sk_buff * skb)857 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
858 struct net_bridge_vlan_group *vg,
859 struct sk_buff *skb)
860 {
861 return skb;
862 }
863
br_vlan_add(struct net_bridge * br,u16 vid,u16 flags)864 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags)
865 {
866 return -EOPNOTSUPP;
867 }
868
br_vlan_delete(struct net_bridge * br,u16 vid)869 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
870 {
871 return -EOPNOTSUPP;
872 }
873
br_vlan_flush(struct net_bridge * br)874 static inline void br_vlan_flush(struct net_bridge *br)
875 {
876 }
877
br_recalculate_fwd_mask(struct net_bridge * br)878 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
879 {
880 }
881
br_vlan_init(struct net_bridge * br)882 static inline int br_vlan_init(struct net_bridge *br)
883 {
884 return 0;
885 }
886
nbp_vlan_add(struct net_bridge_port * port,u16 vid,u16 flags)887 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags)
888 {
889 return -EOPNOTSUPP;
890 }
891
nbp_vlan_delete(struct net_bridge_port * port,u16 vid)892 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
893 {
894 return -EOPNOTSUPP;
895 }
896
nbp_vlan_flush(struct net_bridge_port * port)897 static inline void nbp_vlan_flush(struct net_bridge_port *port)
898 {
899 }
900
br_vlan_find(struct net_bridge_vlan_group * vg,u16 vid)901 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
902 u16 vid)
903 {
904 return NULL;
905 }
906
nbp_vlan_init(struct net_bridge_port * port)907 static inline int nbp_vlan_init(struct net_bridge_port *port)
908 {
909 return 0;
910 }
911
br_vlan_get_tag(const struct sk_buff * skb,u16 * tag)912 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
913 {
914 return 0;
915 }
916
br_get_pvid(const struct net_bridge_vlan_group * vg)917 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
918 {
919 return 0;
920 }
921
br_vlan_enabled(struct net_bridge * br)922 static inline int br_vlan_enabled(struct net_bridge *br)
923 {
924 return 0;
925 }
926
__br_vlan_filter_toggle(struct net_bridge * br,unsigned long val)927 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
928 unsigned long val)
929 {
930 return -EOPNOTSUPP;
931 }
932
nbp_get_num_vlan_infos(struct net_bridge_port * p,u32 filter_mask)933 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
934 u32 filter_mask)
935 {
936 return 0;
937 }
938
br_vlan_group(const struct net_bridge * br)939 static inline struct net_bridge_vlan_group *br_vlan_group(
940 const struct net_bridge *br)
941 {
942 return NULL;
943 }
944
nbp_vlan_group(const struct net_bridge_port * p)945 static inline struct net_bridge_vlan_group *nbp_vlan_group(
946 const struct net_bridge_port *p)
947 {
948 return NULL;
949 }
950
br_vlan_group_rcu(const struct net_bridge * br)951 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
952 const struct net_bridge *br)
953 {
954 return NULL;
955 }
956
nbp_vlan_group_rcu(const struct net_bridge_port * p)957 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
958 const struct net_bridge_port *p)
959 {
960 return NULL;
961 }
962
br_vlan_get_stats(const struct net_bridge_vlan * v,struct br_vlan_stats * stats)963 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
964 struct br_vlan_stats *stats)
965 {
966 }
967 #endif
968
969 struct nf_br_ops {
970 int (*br_dev_xmit_hook)(struct sk_buff *skb);
971 };
972 extern const struct nf_br_ops __rcu *nf_br_ops;
973
974 /* br_netfilter.c */
975 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
976 int br_nf_core_init(void);
977 void br_nf_core_fini(void);
978 void br_netfilter_rtable_init(struct net_bridge *);
979 #else
br_nf_core_init(void)980 static inline int br_nf_core_init(void) { return 0; }
br_nf_core_fini(void)981 static inline void br_nf_core_fini(void) {}
982 #define br_netfilter_rtable_init(x)
983 #endif
984
985 /* br_stp.c */
986 void br_set_state(struct net_bridge_port *p, unsigned int state);
987 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
988 void br_init_port(struct net_bridge_port *p);
989 void br_become_designated_port(struct net_bridge_port *p);
990
991 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
992 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
993 int br_set_hello_time(struct net_bridge *br, unsigned long x);
994 int br_set_max_age(struct net_bridge *br, unsigned long x);
995 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
996
997
998 /* br_stp_if.c */
999 void br_stp_enable_bridge(struct net_bridge *br);
1000 void br_stp_disable_bridge(struct net_bridge *br);
1001 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1002 void br_stp_enable_port(struct net_bridge_port *p);
1003 void br_stp_disable_port(struct net_bridge_port *p);
1004 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1005 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1006 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1007 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1008 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1009 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1010
1011 /* br_stp_bpdu.c */
1012 struct stp_proto;
1013 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1014 struct net_device *dev);
1015
1016 /* br_stp_timer.c */
1017 void br_stp_timer_init(struct net_bridge *br);
1018 void br_stp_port_timer_init(struct net_bridge_port *p);
1019 unsigned long br_timer_value(const struct timer_list *timer);
1020
1021 /* br.c */
1022 #if IS_ENABLED(CONFIG_ATM_LANE)
1023 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1024 #endif
1025
1026 /* br_netlink.c */
1027 extern struct rtnl_link_ops br_link_ops;
1028 int br_netlink_init(void);
1029 void br_netlink_fini(void);
1030 void br_ifinfo_notify(int event, struct net_bridge_port *port);
1031 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1032 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1033 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1034 u32 filter_mask, int nlflags);
1035
1036 #ifdef CONFIG_SYSFS
1037 /* br_sysfs_if.c */
1038 extern const struct sysfs_ops brport_sysfs_ops;
1039 int br_sysfs_addif(struct net_bridge_port *p);
1040 int br_sysfs_renameif(struct net_bridge_port *p);
1041
1042 /* br_sysfs_br.c */
1043 int br_sysfs_addbr(struct net_device *dev);
1044 void br_sysfs_delbr(struct net_device *dev);
1045
1046 #else
1047
br_sysfs_addif(struct net_bridge_port * p)1048 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
br_sysfs_renameif(struct net_bridge_port * p)1049 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
br_sysfs_addbr(struct net_device * dev)1050 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
br_sysfs_delbr(struct net_device * dev)1051 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1052 #endif /* CONFIG_SYSFS */
1053
1054 /* br_switchdev.c */
1055 #ifdef CONFIG_NET_SWITCHDEV
1056 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1057 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1058 struct sk_buff *skb);
1059 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1060 const struct sk_buff *skb);
1061 #else
nbp_switchdev_mark_set(struct net_bridge_port * p)1062 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1063 {
1064 return 0;
1065 }
1066
nbp_switchdev_frame_mark(const struct net_bridge_port * p,struct sk_buff * skb)1067 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1068 struct sk_buff *skb)
1069 {
1070 }
1071
nbp_switchdev_allowed_egress(const struct net_bridge_port * p,const struct sk_buff * skb)1072 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1073 const struct sk_buff *skb)
1074 {
1075 return true;
1076 }
1077 #endif /* CONFIG_NET_SWITCHDEV */
1078
1079 #endif
1080