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 IS_ENABLED(CONFIG_IPV6)
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
;
88 struct net_bridge_mdb_entry
90 struct hlist_node hlist
[2];
91 struct net_bridge
*br
;
92 struct net_bridge_port_group __rcu
*ports
;
94 struct timer_list timer
;
99 struct net_bridge_mdb_htable
101 struct hlist_head
*mhash
;
103 struct net_bridge_mdb_htable
*old
;
110 struct net_bridge_port
112 struct net_bridge
*br
;
113 struct net_device
*dev
;
114 struct list_head list
;
120 unsigned char topology_change_ack
;
121 unsigned char config_pending
;
123 port_id designated_port
;
124 bridge_id designated_root
;
125 bridge_id designated_bridge
;
128 unsigned long designated_age
;
130 struct timer_list forward_delay_timer
;
131 struct timer_list hold_timer
;
132 struct timer_list message_age_timer
;
137 #define BR_HAIRPIN_MODE 0x00000001
138 #define BR_BPDU_GUARD 0x00000002
139 #define BR_ROOT_BLOCK 0x00000004
140 #define BR_MULTICAST_FAST_LEAVE 0x00000008
142 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
143 u32 multicast_startup_queries_sent
;
144 unsigned char multicast_router
;
145 struct timer_list multicast_router_timer
;
146 struct timer_list multicast_query_timer
;
147 struct hlist_head mglist
;
148 struct hlist_node rlist
;
152 char sysfs_name
[IFNAMSIZ
];
155 #ifdef CONFIG_NET_POLL_CONTROLLER
160 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
162 static inline struct net_bridge_port
*br_port_get_rcu(const struct net_device
*dev
)
164 struct net_bridge_port
*port
=
165 rcu_dereference_rtnl(dev
->rx_handler_data
);
167 return br_port_exists(dev
) ? port
: NULL
;
170 static inline struct net_bridge_port
*br_port_get_rtnl(struct net_device
*dev
)
172 return br_port_exists(dev
) ?
173 rtnl_dereference(dev
->rx_handler_data
) : NULL
;
176 struct br_cpu_netstats
{
181 struct u64_stats_sync syncp
;
187 struct list_head port_list
;
188 struct net_device
*dev
;
190 struct br_cpu_netstats __percpu
*stats
;
191 spinlock_t hash_lock
;
192 struct hlist_head hash
[BR_HASH_SIZE
];
193 #ifdef CONFIG_BRIDGE_NETFILTER
194 struct rtable fake_rtable
;
195 bool nf_call_iptables
;
196 bool nf_call_ip6tables
;
197 bool nf_call_arptables
;
200 #define BR_SET_MAC_ADDR 0x00000001
205 bridge_id designated_root
;
208 unsigned long max_age
;
209 unsigned long hello_time
;
210 unsigned long forward_delay
;
211 unsigned long bridge_max_age
;
212 unsigned long ageing_time
;
213 unsigned long bridge_hello_time
;
214 unsigned long bridge_forward_delay
;
216 u8 group_addr
[ETH_ALEN
];
220 BR_NO_STP
, /* no spanning tree */
221 BR_KERNEL_STP
, /* old STP in kernel */
222 BR_USER_STP
, /* new RSTP in userspace */
225 unsigned char topology_change
;
226 unsigned char topology_change_detected
;
228 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
229 unsigned char multicast_router
;
231 u8 multicast_disabled
:1;
232 u8 multicast_querier
:1;
237 u32 multicast_last_member_count
;
238 u32 multicast_startup_queries_sent
;
239 u32 multicast_startup_query_count
;
241 unsigned long multicast_last_member_interval
;
242 unsigned long multicast_membership_interval
;
243 unsigned long multicast_querier_interval
;
244 unsigned long multicast_query_interval
;
245 unsigned long multicast_query_response_interval
;
246 unsigned long multicast_startup_query_interval
;
248 spinlock_t multicast_lock
;
249 struct net_bridge_mdb_htable __rcu
*mdb
;
250 struct hlist_head router_list
;
252 struct timer_list multicast_router_timer
;
253 struct timer_list multicast_querier_timer
;
254 struct timer_list multicast_query_timer
;
257 struct timer_list hello_timer
;
258 struct timer_list tcn_timer
;
259 struct timer_list topology_change_timer
;
260 struct timer_list gc_timer
;
261 struct kobject
*ifobj
;
264 struct br_input_skb_cb
{
265 struct net_device
*brdev
;
266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
272 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
274 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
275 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
277 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
280 #define br_printk(level, br, format, args...) \
281 printk(level "%s: " format, (br)->dev->name, ##args)
283 #define br_err(__br, format, args...) \
284 br_printk(KERN_ERR, __br, format, ##args)
285 #define br_warn(__br, format, args...) \
286 br_printk(KERN_WARNING, __br, format, ##args)
287 #define br_notice(__br, format, args...) \
288 br_printk(KERN_NOTICE, __br, format, ##args)
289 #define br_info(__br, format, args...) \
290 br_printk(KERN_INFO, __br, format, ##args)
292 #define br_debug(br, format, args...) \
293 pr_debug("%s: " format, (br)->dev->name, ##args)
295 extern struct notifier_block br_device_notifier
;
297 /* called under bridge lock */
298 static inline int br_is_root_bridge(const struct net_bridge
*br
)
300 return !memcmp(&br
->bridge_id
, &br
->designated_root
, 8);
304 extern void br_dev_setup(struct net_device
*dev
);
305 extern void br_dev_delete(struct net_device
*dev
, struct list_head
*list
);
306 extern netdev_tx_t
br_dev_xmit(struct sk_buff
*skb
,
307 struct net_device
*dev
);
308 #ifdef CONFIG_NET_POLL_CONTROLLER
309 static inline struct netpoll_info
*br_netpoll_info(struct net_bridge
*br
)
311 return br
->dev
->npinfo
;
314 static inline void br_netpoll_send_skb(const struct net_bridge_port
*p
,
317 struct netpoll
*np
= p
->np
;
320 netpoll_send_skb(np
, skb
);
323 extern int br_netpoll_enable(struct net_bridge_port
*p
, gfp_t gfp
);
324 extern void br_netpoll_disable(struct net_bridge_port
*p
);
326 static inline struct netpoll_info
*br_netpoll_info(struct net_bridge
*br
)
331 static inline void br_netpoll_send_skb(const struct net_bridge_port
*p
,
336 static inline int br_netpoll_enable(struct net_bridge_port
*p
, gfp_t gfp
)
341 static inline void br_netpoll_disable(struct net_bridge_port
*p
)
347 extern int br_fdb_init(void);
348 extern void br_fdb_fini(void);
349 extern void br_fdb_flush(struct net_bridge
*br
);
350 extern void br_fdb_changeaddr(struct net_bridge_port
*p
,
351 const unsigned char *newaddr
);
352 extern void br_fdb_change_mac_address(struct net_bridge
*br
, const u8
*newaddr
);
353 extern void br_fdb_cleanup(unsigned long arg
);
354 extern void br_fdb_delete_by_port(struct net_bridge
*br
,
355 const struct net_bridge_port
*p
, int do_all
);
356 extern struct net_bridge_fdb_entry
*__br_fdb_get(struct net_bridge
*br
,
357 const unsigned char *addr
);
358 extern int br_fdb_test_addr(struct net_device
*dev
, unsigned char *addr
);
359 extern int br_fdb_fillbuf(struct net_bridge
*br
, void *buf
,
360 unsigned long count
, unsigned long off
);
361 extern int br_fdb_insert(struct net_bridge
*br
,
362 struct net_bridge_port
*source
,
363 const unsigned char *addr
);
364 extern void br_fdb_update(struct net_bridge
*br
,
365 struct net_bridge_port
*source
,
366 const unsigned char *addr
);
368 extern int br_fdb_delete(struct ndmsg
*ndm
,
369 struct net_device
*dev
,
370 const unsigned char *addr
);
371 extern int br_fdb_add(struct ndmsg
*nlh
, struct nlattr
*tb
[],
372 struct net_device
*dev
,
373 const unsigned char *addr
,
375 extern int br_fdb_dump(struct sk_buff
*skb
,
376 struct netlink_callback
*cb
,
377 struct net_device
*dev
,
381 extern void br_deliver(const struct net_bridge_port
*to
,
382 struct sk_buff
*skb
);
383 extern int br_dev_queue_push_xmit(struct sk_buff
*skb
);
384 extern void br_forward(const struct net_bridge_port
*to
,
385 struct sk_buff
*skb
, struct sk_buff
*skb0
);
386 extern int br_forward_finish(struct sk_buff
*skb
);
387 extern void br_flood_deliver(struct net_bridge
*br
, struct sk_buff
*skb
);
388 extern void br_flood_forward(struct net_bridge
*br
, struct sk_buff
*skb
,
389 struct sk_buff
*skb2
);
392 extern void br_port_carrier_check(struct net_bridge_port
*p
);
393 extern int br_add_bridge(struct net
*net
, const char *name
);
394 extern int br_del_bridge(struct net
*net
, const char *name
);
395 extern void br_net_exit(struct net
*net
);
396 extern int br_add_if(struct net_bridge
*br
,
397 struct net_device
*dev
);
398 extern int br_del_if(struct net_bridge
*br
,
399 struct net_device
*dev
);
400 extern int br_min_mtu(const struct net_bridge
*br
);
401 extern netdev_features_t
br_features_recompute(struct net_bridge
*br
,
402 netdev_features_t features
);
405 extern int br_handle_frame_finish(struct sk_buff
*skb
);
406 extern rx_handler_result_t
br_handle_frame(struct sk_buff
**pskb
);
409 extern int br_dev_ioctl(struct net_device
*dev
, struct ifreq
*rq
, int cmd
);
410 extern int br_ioctl_deviceless_stub(struct net
*net
, unsigned int cmd
, void __user
*arg
);
413 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
414 extern unsigned int br_mdb_rehash_seq
;
415 extern int br_multicast_rcv(struct net_bridge
*br
,
416 struct net_bridge_port
*port
,
417 struct sk_buff
*skb
);
418 extern struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
419 struct sk_buff
*skb
);
420 extern void br_multicast_add_port(struct net_bridge_port
*port
);
421 extern void br_multicast_del_port(struct net_bridge_port
*port
);
422 extern void br_multicast_enable_port(struct net_bridge_port
*port
);
423 extern void br_multicast_disable_port(struct net_bridge_port
*port
);
424 extern void br_multicast_init(struct net_bridge
*br
);
425 extern void br_multicast_open(struct net_bridge
*br
);
426 extern void br_multicast_stop(struct net_bridge
*br
);
427 extern void br_multicast_deliver(struct net_bridge_mdb_entry
*mdst
,
428 struct sk_buff
*skb
);
429 extern void br_multicast_forward(struct net_bridge_mdb_entry
*mdst
,
430 struct sk_buff
*skb
, struct sk_buff
*skb2
);
431 extern int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
);
432 extern int br_multicast_set_port_router(struct net_bridge_port
*p
,
434 extern int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
);
435 extern int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
);
436 extern int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
);
437 extern void br_mdb_init(void);
439 static inline bool br_multicast_is_router(struct net_bridge
*br
)
441 return br
->multicast_router
== 2 ||
442 (br
->multicast_router
== 1 &&
443 timer_pending(&br
->multicast_router_timer
));
446 static inline int br_multicast_rcv(struct net_bridge
*br
,
447 struct net_bridge_port
*port
,
453 static inline struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
459 static inline void br_multicast_add_port(struct net_bridge_port
*port
)
463 static inline void br_multicast_del_port(struct net_bridge_port
*port
)
467 static inline void br_multicast_enable_port(struct net_bridge_port
*port
)
471 static inline void br_multicast_disable_port(struct net_bridge_port
*port
)
475 static inline void br_multicast_init(struct net_bridge
*br
)
479 static inline void br_multicast_open(struct net_bridge
*br
)
483 static inline void br_multicast_stop(struct net_bridge
*br
)
487 static inline void br_multicast_deliver(struct net_bridge_mdb_entry
*mdst
,
492 static inline void br_multicast_forward(struct net_bridge_mdb_entry
*mdst
,
494 struct sk_buff
*skb2
)
497 static inline bool br_multicast_is_router(struct net_bridge
*br
)
504 #ifdef CONFIG_BRIDGE_NETFILTER
505 extern int br_netfilter_init(void);
506 extern void br_netfilter_fini(void);
507 extern void br_netfilter_rtable_init(struct net_bridge
*);
509 #define br_netfilter_init() (0)
510 #define br_netfilter_fini() do { } while(0)
511 #define br_netfilter_rtable_init(x)
515 extern void br_log_state(const struct net_bridge_port
*p
);
516 extern struct net_bridge_port
*br_get_port(struct net_bridge
*br
,
518 extern void br_init_port(struct net_bridge_port
*p
);
519 extern void br_become_designated_port(struct net_bridge_port
*p
);
521 extern int br_set_forward_delay(struct net_bridge
*br
, unsigned long x
);
522 extern int br_set_hello_time(struct net_bridge
*br
, unsigned long x
);
523 extern int br_set_max_age(struct net_bridge
*br
, unsigned long x
);
527 extern void br_stp_enable_bridge(struct net_bridge
*br
);
528 extern void br_stp_disable_bridge(struct net_bridge
*br
);
529 extern void br_stp_set_enabled(struct net_bridge
*br
, unsigned long val
);
530 extern void br_stp_enable_port(struct net_bridge_port
*p
);
531 extern void br_stp_disable_port(struct net_bridge_port
*p
);
532 extern bool br_stp_recalculate_bridge_id(struct net_bridge
*br
);
533 extern void br_stp_change_bridge_id(struct net_bridge
*br
, const unsigned char *a
);
534 extern void br_stp_set_bridge_priority(struct net_bridge
*br
,
536 extern int br_stp_set_port_priority(struct net_bridge_port
*p
,
537 unsigned long newprio
);
538 extern int br_stp_set_path_cost(struct net_bridge_port
*p
,
539 unsigned long path_cost
);
540 extern ssize_t
br_show_bridge_id(char *buf
, const struct bridge_id
*id
);
544 extern void br_stp_rcv(const struct stp_proto
*proto
, struct sk_buff
*skb
,
545 struct net_device
*dev
);
548 extern void br_stp_timer_init(struct net_bridge
*br
);
549 extern void br_stp_port_timer_init(struct net_bridge_port
*p
);
550 extern unsigned long br_timer_value(const struct timer_list
*timer
);
553 #if IS_ENABLED(CONFIG_ATM_LANE)
554 extern int (*br_fdb_test_addr_hook
)(struct net_device
*dev
, unsigned char *addr
);
558 extern struct rtnl_link_ops br_link_ops
;
559 extern int br_netlink_init(void);
560 extern void br_netlink_fini(void);
561 extern void br_ifinfo_notify(int event
, struct net_bridge_port
*port
);
562 extern int br_setlink(struct net_device
*dev
, struct nlmsghdr
*nlmsg
);
563 extern int br_getlink(struct sk_buff
*skb
, u32 pid
, u32 seq
,
564 struct net_device
*dev
);
568 extern const struct sysfs_ops brport_sysfs_ops
;
569 extern int br_sysfs_addif(struct net_bridge_port
*p
);
570 extern int br_sysfs_renameif(struct net_bridge_port
*p
);
573 extern int br_sysfs_addbr(struct net_device
*dev
);
574 extern void br_sysfs_delbr(struct net_device
*dev
);
578 static inline int br_sysfs_addif(struct net_bridge_port
*p
) { return 0; }
579 static inline int br_sysfs_renameif(struct net_bridge_port
*p
) { return 0; }
580 static inline int br_sysfs_addbr(struct net_device
*dev
) { return 0; }
581 static inline void br_sysfs_delbr(struct net_device
*dev
) { return; }
582 #endif /* CONFIG_SYSFS */