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;
80 struct timer_list query_timer;
85 struct net_bridge_mdb_entry
87 struct hlist_node hlist[2];
88 struct net_bridge *br;
89 struct net_bridge_port_group __rcu *ports;
91 struct timer_list timer;
92 struct timer_list query_timer;
98 struct net_bridge_mdb_htable
100 struct hlist_head *mhash;
102 struct net_bridge_mdb_htable *old;
109 struct net_bridge_port
111 struct net_bridge *br;
112 struct net_device *dev;
113 struct list_head list;
119 unsigned char topology_change_ack;
120 unsigned char config_pending;
122 port_id designated_port;
123 bridge_id designated_root;
124 bridge_id designated_bridge;
128 struct timer_list forward_delay_timer;
129 struct timer_list hold_timer;
130 struct timer_list message_age_timer;
135 #define BR_HAIRPIN_MODE 0x00000001
137 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
138 u32 multicast_startup_queries_sent;
139 unsigned char multicast_router;
140 struct timer_list multicast_router_timer;
141 struct timer_list multicast_query_timer;
142 struct hlist_head mglist;
143 struct hlist_node rlist;
147 char sysfs_name[IFNAMSIZ];
150 #ifdef CONFIG_NET_POLL_CONTROLLER
155 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
157 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
159 struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data);
160 return br_port_exists(dev) ? port : NULL;
163 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
165 return br_port_exists(dev) ?
166 rtnl_dereference(dev->rx_handler_data) : NULL;
169 struct br_cpu_netstats {
174 struct u64_stats_sync syncp;
180 struct list_head port_list;
181 struct net_device *dev;
183 struct br_cpu_netstats __percpu *stats;
184 spinlock_t hash_lock;
185 struct hlist_head hash[BR_HASH_SIZE];
187 #ifdef CONFIG_BRIDGE_NETFILTER
188 struct rtable fake_rtable;
189 bool nf_call_iptables;
190 bool nf_call_ip6tables;
191 bool nf_call_arptables;
194 #define BR_SET_MAC_ADDR 0x00000001
197 bridge_id designated_root;
200 unsigned long max_age;
201 unsigned long hello_time;
202 unsigned long forward_delay;
203 unsigned long bridge_max_age;
204 unsigned long ageing_time;
205 unsigned long bridge_hello_time;
206 unsigned long bridge_forward_delay;
208 u8 group_addr[ETH_ALEN];
212 BR_NO_STP, /* no spanning tree */
213 BR_KERNEL_STP, /* old STP in kernel */
214 BR_USER_STP, /* new RSTP in userspace */
217 unsigned char topology_change;
218 unsigned char topology_change_detected;
220 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
221 unsigned char multicast_router;
223 u8 multicast_disabled:1;
228 u32 multicast_last_member_count;
229 u32 multicast_startup_queries_sent;
230 u32 multicast_startup_query_count;
232 unsigned long multicast_last_member_interval;
233 unsigned long multicast_membership_interval;
234 unsigned long multicast_querier_interval;
235 unsigned long multicast_query_interval;
236 unsigned long multicast_query_response_interval;
237 unsigned long multicast_startup_query_interval;
239 spinlock_t multicast_lock;
240 struct net_bridge_mdb_htable __rcu *mdb;
241 struct hlist_head router_list;
243 struct timer_list multicast_router_timer;
244 struct timer_list multicast_querier_timer;
245 struct timer_list multicast_query_timer;
248 struct timer_list hello_timer;
249 struct timer_list tcn_timer;
250 struct timer_list topology_change_timer;
251 struct timer_list gc_timer;
252 struct kobject *ifobj;
255 struct br_input_skb_cb {
256 struct net_device *brdev;
257 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
263 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
265 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
266 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
268 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
271 #define br_printk(level, br, format, args...) \
272 printk(level "%s: " format, (br)->dev->name, ##args)
274 #define br_err(__br, format, args...) \
275 br_printk(KERN_ERR, __br, format, ##args)
276 #define br_warn(__br, format, args...) \
277 br_printk(KERN_WARNING, __br, format, ##args)
278 #define br_notice(__br, format, args...) \
279 br_printk(KERN_NOTICE, __br, format, ##args)
280 #define br_info(__br, format, args...) \
281 br_printk(KERN_INFO, __br, format, ##args)
283 #define br_debug(br, format, args...) \
284 pr_debug("%s: " format, (br)->dev->name, ##args)
286 extern struct notifier_block br_device_notifier;
287 extern const u8 br_group_address[ETH_ALEN];
289 /* called under bridge lock */
290 static inline int br_is_root_bridge(const struct net_bridge *br)
292 return !memcmp(&br->bridge_id, &br->designated_root, 8);
296 extern void br_dev_setup(struct net_device *dev);
297 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
298 struct net_device *dev);
299 #ifdef CONFIG_NET_POLL_CONTROLLER
300 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
302 return br->dev->npinfo;
305 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
308 struct netpoll *np = p->np;
311 netpoll_send_skb(np, skb);
314 extern int br_netpoll_enable(struct net_bridge_port *p);
315 extern void br_netpoll_disable(struct net_bridge_port *p);
317 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
322 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
327 static inline int br_netpoll_enable(struct net_bridge_port *p)
332 static inline void br_netpoll_disable(struct net_bridge_port *p)
338 extern int br_fdb_init(void);
339 extern void br_fdb_fini(void);
340 extern void br_fdb_flush(struct net_bridge *br);
341 extern void br_fdb_changeaddr(struct net_bridge_port *p,
342 const unsigned char *newaddr);
343 extern void br_fdb_cleanup(unsigned long arg);
344 extern void br_fdb_delete_by_port(struct net_bridge *br,
345 const struct net_bridge_port *p, int do_all);
346 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
347 const unsigned char *addr);
348 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
349 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
350 unsigned long count, unsigned long off);
351 extern int br_fdb_insert(struct net_bridge *br,
352 struct net_bridge_port *source,
353 const unsigned char *addr);
354 extern void br_fdb_update(struct net_bridge *br,
355 struct net_bridge_port *source,
356 const unsigned char *addr);
357 extern int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb);
360 extern void br_deliver(const struct net_bridge_port *to,
361 struct sk_buff *skb);
362 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
363 extern void br_forward(const struct net_bridge_port *to,
364 struct sk_buff *skb, struct sk_buff *skb0);
365 extern int br_forward_finish(struct sk_buff *skb);
366 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
367 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
368 struct sk_buff *skb2);
371 extern void br_port_carrier_check(struct net_bridge_port *p);
372 extern int br_add_bridge(struct net *net, const char *name);
373 extern int br_del_bridge(struct net *net, const char *name);
374 extern void br_net_exit(struct net *net);
375 extern int br_add_if(struct net_bridge *br,
376 struct net_device *dev);
377 extern int br_del_if(struct net_bridge *br,
378 struct net_device *dev);
379 extern int br_min_mtu(const struct net_bridge *br);
380 extern void br_features_recompute(struct net_bridge *br);
383 extern int br_handle_frame_finish(struct sk_buff *skb);
384 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
387 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
388 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
391 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
392 extern int br_multicast_rcv(struct net_bridge *br,
393 struct net_bridge_port *port,
394 struct sk_buff *skb);
395 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
396 struct sk_buff *skb);
397 extern void br_multicast_add_port(struct net_bridge_port *port);
398 extern void br_multicast_del_port(struct net_bridge_port *port);
399 extern void br_multicast_enable_port(struct net_bridge_port *port);
400 extern void br_multicast_disable_port(struct net_bridge_port *port);
401 extern void br_multicast_init(struct net_bridge *br);
402 extern void br_multicast_open(struct net_bridge *br);
403 extern void br_multicast_stop(struct net_bridge *br);
404 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
405 struct sk_buff *skb);
406 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
407 struct sk_buff *skb, struct sk_buff *skb2);
408 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
409 extern int br_multicast_set_port_router(struct net_bridge_port *p,
411 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
412 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
414 static inline bool br_multicast_is_router(struct net_bridge *br)
416 return br->multicast_router == 2 ||
417 (br->multicast_router == 1 &&
418 timer_pending(&br->multicast_router_timer));
421 static inline int br_multicast_rcv(struct net_bridge *br,
422 struct net_bridge_port *port,
428 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
434 static inline void br_multicast_add_port(struct net_bridge_port *port)
438 static inline void br_multicast_del_port(struct net_bridge_port *port)
442 static inline void br_multicast_enable_port(struct net_bridge_port *port)
446 static inline void br_multicast_disable_port(struct net_bridge_port *port)
450 static inline void br_multicast_init(struct net_bridge *br)
454 static inline void br_multicast_open(struct net_bridge *br)
458 static inline void br_multicast_stop(struct net_bridge *br)
462 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
467 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
469 struct sk_buff *skb2)
472 static inline bool br_multicast_is_router(struct net_bridge *br)
479 #ifdef CONFIG_BRIDGE_NETFILTER
480 extern int br_netfilter_init(void);
481 extern void br_netfilter_fini(void);
482 extern void br_netfilter_rtable_init(struct net_bridge *);
484 #define br_netfilter_init() (0)
485 #define br_netfilter_fini() do { } while(0)
486 #define br_netfilter_rtable_init(x)
490 extern void br_log_state(const struct net_bridge_port *p);
491 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
493 extern void br_init_port(struct net_bridge_port *p);
494 extern void br_become_designated_port(struct net_bridge_port *p);
497 extern void br_stp_enable_bridge(struct net_bridge *br);
498 extern void br_stp_disable_bridge(struct net_bridge *br);
499 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
500 extern void br_stp_enable_port(struct net_bridge_port *p);
501 extern void br_stp_disable_port(struct net_bridge_port *p);
502 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
503 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
504 extern void br_stp_set_bridge_priority(struct net_bridge *br,
506 extern void br_stp_set_port_priority(struct net_bridge_port *p,
508 extern void br_stp_set_path_cost(struct net_bridge_port *p,
510 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
514 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
515 struct net_device *dev);
518 extern void br_stp_timer_init(struct net_bridge *br);
519 extern void br_stp_port_timer_init(struct net_bridge_port *p);
520 extern unsigned long br_timer_value(const struct timer_list *timer);
523 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
524 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
528 extern int br_netlink_init(void);
529 extern void br_netlink_fini(void);
530 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
534 extern const struct sysfs_ops brport_sysfs_ops;
535 extern int br_sysfs_addif(struct net_bridge_port *p);
536 extern int br_sysfs_renameif(struct net_bridge_port *p);
539 extern int br_sysfs_addbr(struct net_device *dev);
540 extern void br_sysfs_delbr(struct net_device *dev);
544 #define br_sysfs_addif(p) (0)
545 #define br_sysfs_renameif(p) (0)
546 #define br_sysfs_addbr(dev) (0)
547 #define br_sysfs_delbr(dev) do { } while(0)
548 #endif /* CONFIG_SYSFS */