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 /* Control of forwarding link local multicast */
33 #define BR_GROUPFWD_DEFAULT 0
34 /* Don't allow forwarding control protocols like STP and LLDP */
35 #define BR_GROUPFWD_RESTRICTED 0x4007u
37 /* Path to usermode spanning tree program */
38 #define BR_STP_PROG "/sbin/bridge-stp"
40 typedef struct bridge_id bridge_id;
41 typedef struct mac_addr mac_addr;
42 typedef __u16 port_id;
46 unsigned char prio[2];
47 unsigned char addr[6];
52 unsigned char addr[6];
59 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
66 struct net_bridge_fdb_entry
68 struct hlist_node hlist;
69 struct net_bridge_port *dst;
72 unsigned long updated;
75 unsigned char is_local;
76 unsigned char is_static;
79 struct net_bridge_port_group {
80 struct net_bridge_port *port;
81 struct net_bridge_port_group __rcu *next;
82 struct hlist_node mglist;
84 struct timer_list timer;
85 struct timer_list query_timer;
90 struct net_bridge_mdb_entry
92 struct hlist_node hlist[2];
93 struct net_bridge *br;
94 struct net_bridge_port_group __rcu *ports;
96 struct timer_list timer;
97 struct timer_list query_timer;
103 struct net_bridge_mdb_htable
105 struct hlist_head *mhash;
107 struct net_bridge_mdb_htable *old;
114 struct net_bridge_port
116 struct net_bridge *br;
117 struct net_device *dev;
118 struct list_head list;
124 unsigned char topology_change_ack;
125 unsigned char config_pending;
127 port_id designated_port;
128 bridge_id designated_root;
129 bridge_id designated_bridge;
132 unsigned long designated_age;
134 struct timer_list forward_delay_timer;
135 struct timer_list hold_timer;
136 struct timer_list message_age_timer;
141 #define BR_HAIRPIN_MODE 0x00000001
143 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
144 u32 multicast_startup_queries_sent;
145 unsigned char multicast_router;
146 struct timer_list multicast_router_timer;
147 struct timer_list multicast_query_timer;
148 struct hlist_head mglist;
149 struct hlist_node rlist;
153 char sysfs_name[IFNAMSIZ];
156 #ifdef CONFIG_NET_POLL_CONTROLLER
161 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
163 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
165 struct net_bridge_port *port = rcu_dereference(dev->rx_handler_data);
166 return br_port_exists(dev) ? port : NULL;
169 static inline struct net_bridge_port *br_port_get_rtnl(struct net_device *dev)
171 return br_port_exists(dev) ?
172 rtnl_dereference(dev->rx_handler_data) : NULL;
175 struct br_cpu_netstats {
180 struct u64_stats_sync syncp;
186 struct list_head port_list;
187 struct net_device *dev;
189 struct br_cpu_netstats __percpu *stats;
190 spinlock_t hash_lock;
191 struct hlist_head hash[BR_HASH_SIZE];
192 #ifdef CONFIG_BRIDGE_NETFILTER
193 struct rtable fake_rtable;
194 bool nf_call_iptables;
195 bool nf_call_ip6tables;
196 bool nf_call_arptables;
199 #define BR_SET_MAC_ADDR 0x00000001
204 bridge_id designated_root;
207 unsigned long max_age;
208 unsigned long hello_time;
209 unsigned long forward_delay;
210 unsigned long bridge_max_age;
211 unsigned long ageing_time;
212 unsigned long bridge_hello_time;
213 unsigned long bridge_forward_delay;
215 u8 group_addr[ETH_ALEN];
219 BR_NO_STP, /* no spanning tree */
220 BR_KERNEL_STP, /* old STP in kernel */
221 BR_USER_STP, /* new RSTP in userspace */
224 unsigned char topology_change;
225 unsigned char topology_change_detected;
227 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
228 unsigned char multicast_router;
230 u8 multicast_disabled:1;
235 u32 multicast_last_member_count;
236 u32 multicast_startup_queries_sent;
237 u32 multicast_startup_query_count;
239 unsigned long multicast_last_member_interval;
240 unsigned long multicast_membership_interval;
241 unsigned long multicast_querier_interval;
242 unsigned long multicast_query_interval;
243 unsigned long multicast_query_response_interval;
244 unsigned long multicast_startup_query_interval;
246 spinlock_t multicast_lock;
247 struct net_bridge_mdb_htable __rcu *mdb;
248 struct hlist_head router_list;
250 struct timer_list multicast_router_timer;
251 struct timer_list multicast_querier_timer;
252 struct timer_list multicast_query_timer;
255 struct timer_list hello_timer;
256 struct timer_list tcn_timer;
257 struct timer_list topology_change_timer;
258 struct timer_list gc_timer;
259 struct kobject *ifobj;
262 struct br_input_skb_cb {
263 struct net_device *brdev;
264 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
270 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
272 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
273 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
275 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
278 #define br_printk(level, br, format, args...) \
279 printk(level "%s: " format, (br)->dev->name, ##args)
281 #define br_err(__br, format, args...) \
282 br_printk(KERN_ERR, __br, format, ##args)
283 #define br_warn(__br, format, args...) \
284 br_printk(KERN_WARNING, __br, format, ##args)
285 #define br_notice(__br, format, args...) \
286 br_printk(KERN_NOTICE, __br, format, ##args)
287 #define br_info(__br, format, args...) \
288 br_printk(KERN_INFO, __br, format, ##args)
290 #define br_debug(br, format, args...) \
291 pr_debug("%s: " format, (br)->dev->name, ##args)
293 extern struct notifier_block br_device_notifier;
294 extern const u8 br_group_address[ETH_ALEN];
296 /* called under bridge lock */
297 static inline int br_is_root_bridge(const struct net_bridge *br)
299 return !memcmp(&br->bridge_id, &br->designated_root, 8);
303 extern void br_dev_setup(struct net_device *dev);
304 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
305 struct net_device *dev);
306 #ifdef CONFIG_NET_POLL_CONTROLLER
307 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
309 return br->dev->npinfo;
312 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
315 struct netpoll *np = p->np;
318 netpoll_send_skb(np, skb);
321 extern int br_netpoll_enable(struct net_bridge_port *p);
322 extern void br_netpoll_disable(struct net_bridge_port *p);
324 static inline struct netpoll_info *br_netpoll_info(struct net_bridge *br)
329 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
334 static inline int br_netpoll_enable(struct net_bridge_port *p)
339 static inline void br_netpoll_disable(struct net_bridge_port *p)
345 extern int br_fdb_init(void);
346 extern void br_fdb_fini(void);
347 extern void br_fdb_flush(struct net_bridge *br);
348 extern void br_fdb_changeaddr(struct net_bridge_port *p,
349 const unsigned char *newaddr);
350 extern void br_fdb_cleanup(unsigned long arg);
351 extern void br_fdb_delete_by_port(struct net_bridge *br,
352 const struct net_bridge_port *p, int do_all);
353 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
354 const unsigned char *addr);
355 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
356 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
357 unsigned long count, unsigned long off);
358 extern int br_fdb_insert(struct net_bridge *br,
359 struct net_bridge_port *source,
360 const unsigned char *addr);
361 extern void br_fdb_update(struct net_bridge *br,
362 struct net_bridge_port *source,
363 const unsigned char *addr);
364 extern int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb);
365 extern int br_fdb_add(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
366 extern int br_fdb_delete(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg);
369 extern void br_deliver(const struct net_bridge_port *to,
370 struct sk_buff *skb);
371 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
372 extern void br_forward(const struct net_bridge_port *to,
373 struct sk_buff *skb, struct sk_buff *skb0);
374 extern int br_forward_finish(struct sk_buff *skb);
375 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
376 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
377 struct sk_buff *skb2);
380 extern void br_port_carrier_check(struct net_bridge_port *p);
381 extern int br_add_bridge(struct net *net, const char *name);
382 extern int br_del_bridge(struct net *net, const char *name);
383 extern void br_net_exit(struct net *net);
384 extern int br_add_if(struct net_bridge *br,
385 struct net_device *dev);
386 extern int br_del_if(struct net_bridge *br,
387 struct net_device *dev);
388 extern int br_min_mtu(const struct net_bridge *br);
389 extern u32 br_features_recompute(struct net_bridge *br, u32 features);
392 extern int br_handle_frame_finish(struct sk_buff *skb);
393 extern rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
396 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
397 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
400 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
401 extern int br_multicast_rcv(struct net_bridge *br,
402 struct net_bridge_port *port,
403 struct sk_buff *skb);
404 extern struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
405 struct sk_buff *skb);
406 extern void br_multicast_add_port(struct net_bridge_port *port);
407 extern void br_multicast_del_port(struct net_bridge_port *port);
408 extern void br_multicast_enable_port(struct net_bridge_port *port);
409 extern void br_multicast_disable_port(struct net_bridge_port *port);
410 extern void br_multicast_init(struct net_bridge *br);
411 extern void br_multicast_open(struct net_bridge *br);
412 extern void br_multicast_stop(struct net_bridge *br);
413 extern void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
414 struct sk_buff *skb);
415 extern void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
416 struct sk_buff *skb, struct sk_buff *skb2);
417 extern int br_multicast_set_router(struct net_bridge *br, unsigned long val);
418 extern int br_multicast_set_port_router(struct net_bridge_port *p,
420 extern int br_multicast_toggle(struct net_bridge *br, unsigned long val);
421 extern int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
423 static inline bool br_multicast_is_router(struct net_bridge *br)
425 return br->multicast_router == 2 ||
426 (br->multicast_router == 1 &&
427 timer_pending(&br->multicast_router_timer));
430 static inline int br_multicast_rcv(struct net_bridge *br,
431 struct net_bridge_port *port,
437 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
443 static inline void br_multicast_add_port(struct net_bridge_port *port)
447 static inline void br_multicast_del_port(struct net_bridge_port *port)
451 static inline void br_multicast_enable_port(struct net_bridge_port *port)
455 static inline void br_multicast_disable_port(struct net_bridge_port *port)
459 static inline void br_multicast_init(struct net_bridge *br)
463 static inline void br_multicast_open(struct net_bridge *br)
467 static inline void br_multicast_stop(struct net_bridge *br)
471 static inline void br_multicast_deliver(struct net_bridge_mdb_entry *mdst,
476 static inline void br_multicast_forward(struct net_bridge_mdb_entry *mdst,
478 struct sk_buff *skb2)
481 static inline bool br_multicast_is_router(struct net_bridge *br)
488 #ifdef CONFIG_BRIDGE_NETFILTER
489 extern int br_netfilter_init(void);
490 extern void br_netfilter_fini(void);
491 extern void br_netfilter_rtable_init(struct net_bridge *);
493 #define br_netfilter_init() (0)
494 #define br_netfilter_fini() do { } while(0)
495 #define br_netfilter_rtable_init(x)
499 extern void br_log_state(const struct net_bridge_port *p);
500 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
502 extern void br_init_port(struct net_bridge_port *p);
503 extern void br_become_designated_port(struct net_bridge_port *p);
505 extern int br_set_forward_delay(struct net_bridge *br, unsigned long x);
506 extern int br_set_hello_time(struct net_bridge *br, unsigned long x);
507 extern int br_set_max_age(struct net_bridge *br, unsigned long x);
511 extern void br_stp_enable_bridge(struct net_bridge *br);
512 extern void br_stp_disable_bridge(struct net_bridge *br);
513 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
514 extern void br_stp_enable_port(struct net_bridge_port *p);
515 extern void br_stp_disable_port(struct net_bridge_port *p);
516 extern bool br_stp_recalculate_bridge_id(struct net_bridge *br);
517 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
518 extern void br_stp_set_bridge_priority(struct net_bridge *br,
520 extern int br_stp_set_port_priority(struct net_bridge_port *p,
521 unsigned long newprio);
522 extern int br_stp_set_path_cost(struct net_bridge_port *p,
523 unsigned long path_cost);
524 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
528 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
529 struct net_device *dev);
532 extern void br_stp_timer_init(struct net_bridge *br);
533 extern void br_stp_port_timer_init(struct net_bridge_port *p);
534 extern unsigned long br_timer_value(const struct timer_list *timer);
537 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
538 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
542 extern int br_netlink_init(void);
543 extern void br_netlink_fini(void);
544 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
548 extern const struct sysfs_ops brport_sysfs_ops;
549 extern int br_sysfs_addif(struct net_bridge_port *p);
550 extern int br_sysfs_renameif(struct net_bridge_port *p);
553 extern int br_sysfs_addbr(struct net_device *dev);
554 extern void br_sysfs_delbr(struct net_device *dev);
558 #define br_sysfs_addif(p) (0)
559 #define br_sysfs_renameif(p) (0)
560 #define br_sysfs_addbr(dev) (0)
561 #define br_sysfs_delbr(dev) do { } while(0)
562 #endif /* CONFIG_SYSFS */