2 * Linux ethernet bridge
5 * Lennert Buytenhek <buytenh@gnu.org>
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
16 #include <linux/netdevice.h>
17 #include <linux/if_bridge.h>
18 #include <linux/netpoll.h>
19 #include <linux/u64_stats_sync.h>
20 #include <net/route.h>
22 #define BR_HASH_BITS 8
23 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
25 #define BR_HOLD_TIME (1*HZ)
27 #define BR_PORT_BITS 10
28 #define BR_MAX_PORTS (1<<BR_PORT_BITS)
30 #define BR_VERSION "2.3"
32 /* Path to usermode spanning tree program */
33 #define BR_STP_PROG "/sbin/bridge-stp"
35 typedef struct bridge_id bridge_id;
36 typedef struct mac_addr mac_addr;
37 typedef __u16 port_id;
41 unsigned char prio[2];
42 unsigned char addr[6];
47 unsigned char addr[6];
54 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
61 struct net_bridge_fdb_entry
63 struct hlist_node hlist;
64 struct net_bridge_port *dst;
67 unsigned long updated;
70 unsigned char is_local;
71 unsigned char is_static;
74 struct net_bridge_port_group {
75 struct net_bridge_port *port;
76 struct net_bridge_port_group __rcu *next;
77 struct hlist_node mglist;
79 struct timer_list timer;
83 struct net_bridge_mdb_entry
85 struct hlist_node hlist[2];
86 struct net_bridge *br;
87 struct net_bridge_port_group __rcu *ports;
89 struct timer_list timer;
94 struct net_bridge_mdb_htable
96 struct hlist_head *mhash;
98 struct net_bridge_mdb_htable *old;
105 struct net_bridge_port
107 struct net_bridge *br;
108 struct net_device *dev;
109 struct list_head list;
115 unsigned char topology_change_ack;
116 unsigned char config_pending;
118 port_id designated_port;
119 bridge_id designated_root;
120 bridge_id designated_bridge;
123 unsigned long designated_age;
125 struct timer_list forward_delay_timer;
126 struct timer_list hold_timer;
127 struct timer_list message_age_timer;
132 #define BR_HAIRPIN_MODE 0x00000001
134 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
135 u32 multicast_startup_queries_sent;
136 unsigned char multicast_router;
137 struct timer_list multicast_router_timer;
138 struct timer_list multicast_query_timer;
139 struct hlist_head mglist;
140 struct hlist_node rlist;
144 char sysfs_name[IFNAMSIZ];
147 #ifdef CONFIG_NET_POLL_CONTROLLER
152 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
154 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
156 struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data);
157 return br_port_exists(dev) ? port : NULL;
160 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
162 return br_port_exists(dev) ?
163 rtnl_dereference(dev->rx_handler_data) : NULL;
166 struct br_cpu_netstats {
171 struct u64_stats_sync syncp;
177 struct list_head port_list;
178 struct net_device *dev;
180 struct br_cpu_netstats __percpu *stats;
181 spinlock_t hash_lock;
182 struct hlist_head hash[BR_HASH_SIZE];
183 #ifdef CONFIG_BRIDGE_NETFILTER
184 struct rtable fake_rtable;
185 bool nf_call_iptables;
186 bool nf_call_ip6tables;
187 bool nf_call_arptables;
190 #define BR_SET_MAC_ADDR 0x00000001
193 bridge_id designated_root;
196 unsigned long max_age;
197 unsigned long hello_time;
198 unsigned long forward_delay;
199 unsigned long bridge_max_age;
200 unsigned long ageing_time;
201 unsigned long bridge_hello_time;
202 unsigned long bridge_forward_delay;
204 u8 group_addr[ETH_ALEN];
208 BR_NO_STP, /* no spanning tree */
209 BR_KERNEL_STP, /* old STP in kernel */
210 BR_USER_STP, /* new RSTP in userspace */
213 unsigned char topology_change;
214 unsigned char topology_change_detected;
216 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
217 unsigned char multicast_router;
219 u8 multicast_disabled:1;
224 u32 multicast_last_member_count;
225 u32 multicast_startup_queries_sent;
226 u32 multicast_startup_query_count;
228 unsigned long multicast_last_member_interval;
229 unsigned long multicast_membership_interval;
230 unsigned long multicast_querier_interval;
231 unsigned long multicast_query_interval;
232 unsigned long multicast_query_response_interval;
233 unsigned long multicast_startup_query_interval;
235 spinlock_t multicast_lock;
236 struct net_bridge_mdb_htable __rcu *mdb;
237 struct hlist_head router_list;
239 struct timer_list multicast_router_timer;
240 struct timer_list multicast_querier_timer;
241 struct timer_list multicast_query_timer;
244 struct timer_list hello_timer;
245 struct timer_list tcn_timer;
246 struct timer_list topology_change_timer;
247 struct timer_list gc_timer;
248 struct kobject *ifobj;
251 struct br_input_skb_cb {
252 struct net_device *brdev;
253 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
259 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
261 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
262 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
264 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
267 #define br_printk(level, br, format, args...) \
268 printk(level "%s: " format, (br)->dev->name, ##args)
270 #define br_err(__br, format, args...) \
271 br_printk(KERN_ERR, __br, format, ##args)
272 #define br_warn(__br, format, args...) \
273 br_printk(KERN_WARNING, __br, format, ##args)
274 #define br_notice(__br, format, args...) \
275 br_printk(KERN_NOTICE, __br, format, ##args)
276 #define br_info(__br, format, args...) \
277 br_printk(KERN_INFO, __br, format, ##args)
279 #define br_debug(br, format, args...) \
280 pr_debug("%s: " format, (br)->dev->name, ##args)
282 extern struct notifier_block br_device_notifier;
283 extern const u8 br_group_address[ETH_ALEN];
285 /* called under bridge lock */
286 static inline int br_is_root_bridge(const struct net_bridge *br)
288 return !memcmp(&br->bridge_id, &br->designated_root, 8);
292 extern void br_dev_setup(struct net_device *dev);
293 extern void br_dev_delete(struct net_device *dev, struct list_head *list);
294 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
295 struct net_device *dev);
296 #ifdef CONFIG_NET_POLL_CONTROLLER
297 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
299 return br->dev->npinfo;
302 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
305 struct netpoll *np = p->np;
308 netpoll_send_skb(np, skb);
311 extern int br_netpoll_enable(struct net_bridge_port *p);
312 extern void br_netpoll_disable(struct net_bridge_port *p);
314 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
319 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
324 static inline int br_netpoll_enable(struct net_bridge_port *p)
329 static inline void br_netpoll_disable(struct net_bridge_port *p)
335 extern int br_fdb_init(void);
336 extern void br_fdb_fini(void);
337 extern void br_fdb_flush(struct net_bridge *br);
338 extern void br_fdb_changeaddr(struct net_bridge_port *p,
339 const unsigned char *newaddr);
340 extern void br_fdb_cleanup(unsigned long arg);
341 extern void br_fdb_delete_by_port(struct net_bridge *br,
342 const struct net_bridge_port *p, int do_all);
343 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
344 const unsigned char *addr);
345 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
346 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
347 unsigned long count, unsigned long off);
348 extern int br_fdb_insert(struct net_bridge *br,
349 struct net_bridge_port *source,
350 const unsigned char *addr);
351 extern void br_fdb_update(struct net_bridge *br,
352 struct net_bridge_port *source,
353 const unsigned char *addr);
354 extern int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb);
355 extern int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
356 extern int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
359 extern void br_deliver(const struct net_bridge_port *to,
360 struct sk_buff *skb);
361 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
362 extern void br_forward(const struct net_bridge_port *to,
363 struct sk_buff *skb, struct sk_buff *skb0);
364 extern int br_forward_finish(struct sk_buff *skb);
365 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
366 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
367 struct sk_buff *skb2);
370 extern void br_port_carrier_check(struct net_bridge_port *p);
371 extern int br_add_bridge(struct net *net, const char *name);
372 extern int br_del_bridge(struct net *net, const char *name);
373 extern void br_net_exit(struct net *net);
374 extern int br_add_if(struct net_bridge *br,
375 struct net_device *dev);
376 extern int br_del_if(struct net_bridge *br,
377 struct net_device *dev);
378 extern int br_min_mtu(const struct net_bridge *br);
379 extern u32 br_features_recompute(struct net_bridge *br, u32 features);
382 extern int br_handle_frame_finish(struct sk_buff *skb);
383 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
386 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
387 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
390 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
391 extern int br_multicast_rcv(struct net_bridge *br,
392 struct net_bridge_port *port,
393 struct sk_buff *skb);
394 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
395 struct sk_buff *skb);
396 extern void br_multicast_add_port(struct net_bridge_port *port);
397 extern void br_multicast_del_port(struct net_bridge_port *port);
398 extern void br_multicast_enable_port(struct net_bridge_port *port);
399 extern void br_multicast_disable_port(struct net_bridge_port *port);
400 extern void br_multicast_init(struct net_bridge *br);
401 extern void br_multicast_open(struct net_bridge *br);
402 extern void br_multicast_stop(struct net_bridge *br);
403 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
404 struct sk_buff *skb);
405 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
406 struct sk_buff *skb, struct sk_buff *skb2);
407 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
408 extern int br_multicast_set_port_router(struct net_bridge_port *p,
410 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
411 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
413 static inline bool br_multicast_is_router(struct net_bridge *br)
415 return br->multicast_router == 2 ||
416 (br->multicast_router == 1 &&
417 timer_pending(&br->multicast_router_timer));
420 static inline int br_multicast_rcv(struct net_bridge *br,
421 struct net_bridge_port *port,
427 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
433 static inline void br_multicast_add_port(struct net_bridge_port *port)
437 static inline void br_multicast_del_port(struct net_bridge_port *port)
441 static inline void br_multicast_enable_port(struct net_bridge_port *port)
445 static inline void br_multicast_disable_port(struct net_bridge_port *port)
449 static inline void br_multicast_init(struct net_bridge *br)
453 static inline void br_multicast_open(struct net_bridge *br)
457 static inline void br_multicast_stop(struct net_bridge *br)
461 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
466 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
468 struct sk_buff *skb2)
471 static inline bool br_multicast_is_router(struct net_bridge *br)
478 #ifdef CONFIG_BRIDGE_NETFILTER
479 extern int br_netfilter_init(void);
480 extern void br_netfilter_fini(void);
481 extern void br_netfilter_rtable_init(struct net_bridge *);
483 #define br_netfilter_init() (0)
484 #define br_netfilter_fini() do { } while(0)
485 #define br_netfilter_rtable_init(x)
489 extern void br_log_state(const struct net_bridge_port *p);
490 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
492 extern void br_init_port(struct net_bridge_port *p);
493 extern void br_become_designated_port(struct net_bridge_port *p);
495 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
496 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
497 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
501 extern void br_stp_enable_bridge(struct net_bridge *br);
502 extern void br_stp_disable_bridge(struct net_bridge *br);
503 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
504 extern void br_stp_enable_port(struct net_bridge_port *p);
505 extern void br_stp_disable_port(struct net_bridge_port *p);
506 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
507 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
508 extern void br_stp_set_bridge_priority(struct net_bridge *br,
510 extern int br_stp_set_port_priority(struct net_bridge_port *p,
511 unsigned long newprio);
512 extern int br_stp_set_path_cost(struct net_bridge_port *p,
513 unsigned long path_cost);
514 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
518 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
519 struct net_device *dev);
522 extern void br_stp_timer_init(struct net_bridge *br);
523 extern void br_stp_port_timer_init(struct net_bridge_port *p);
524 extern unsigned long br_timer_value(const struct timer_list *timer);
527 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
528 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
532 extern int br_netlink_init(void);
533 extern void br_netlink_fini(void);
534 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
538 extern const struct sysfs_ops brport_sysfs_ops;
539 extern int br_sysfs_addif(struct net_bridge_port *p);
540 extern int br_sysfs_renameif(struct net_bridge_port *p);
543 extern int br_sysfs_addbr(struct net_device *dev);
544 extern void br_sysfs_delbr(struct net_device *dev);
548 #define br_sysfs_addif(p) (0)
549 #define br_sysfs_renameif(p) (0)
550 #define br_sysfs_addbr(dev) (0)
551 #define br_sysfs_delbr(dev) do { } while(0)
552 #endif /* CONFIG_SYSFS */