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>
21 #include <linux/if_vlan.h>
23 #define BR_HASH_BITS 8
24 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
26 #define BR_HOLD_TIME (1*HZ)
28 #define BR_PORT_BITS 10
29 #define BR_MAX_PORTS (1<<BR_PORT_BITS)
30 #define BR_VLAN_BITMAP_LEN BITS_TO_LONGS(VLAN_N_VID)
32 #define BR_VERSION "2.3"
34 /* Control of forwarding link local multicast */
35 #define BR_GROUPFWD_DEFAULT 0
36 /* Don't allow forwarding control protocols like STP and LLDP */
37 #define BR_GROUPFWD_RESTRICTED 0x4007u
39 /* Path to usermode spanning tree program */
40 #define BR_STP_PROG "/sbin/bridge-stp"
42 typedef struct bridge_id bridge_id
;
43 typedef struct mac_addr mac_addr
;
44 typedef __u16 port_id
;
48 unsigned char prio
[2];
49 unsigned char addr
[6];
54 unsigned char addr
[6];
61 #if IS_ENABLED(CONFIG_IPV6)
68 struct net_port_vlans
{
71 struct net_bridge_port
*port
;
72 struct net_bridge
*br
;
75 unsigned long vlan_bitmap
[BR_VLAN_BITMAP_LEN
];
78 struct net_bridge_fdb_entry
80 struct hlist_node hlist
;
81 struct net_bridge_port
*dst
;
84 unsigned long updated
;
87 unsigned char is_local
;
88 unsigned char is_static
;
91 struct net_bridge_port_group
{
92 struct net_bridge_port
*port
;
93 struct net_bridge_port_group __rcu
*next
;
94 struct hlist_node mglist
;
96 struct timer_list timer
;
101 struct net_bridge_mdb_entry
103 struct hlist_node hlist
[2];
104 struct net_bridge
*br
;
105 struct net_bridge_port_group __rcu
*ports
;
107 struct timer_list timer
;
112 struct net_bridge_mdb_htable
114 struct hlist_head
*mhash
;
116 struct net_bridge_mdb_htable
*old
;
123 struct net_bridge_port
125 struct net_bridge
*br
;
126 struct net_device
*dev
;
127 struct list_head list
;
133 unsigned char topology_change_ack
;
134 unsigned char config_pending
;
136 port_id designated_port
;
137 bridge_id designated_root
;
138 bridge_id designated_bridge
;
141 unsigned long designated_age
;
143 struct timer_list forward_delay_timer
;
144 struct timer_list hold_timer
;
145 struct timer_list message_age_timer
;
150 #define BR_HAIRPIN_MODE 0x00000001
151 #define BR_BPDU_GUARD 0x00000002
152 #define BR_ROOT_BLOCK 0x00000004
153 #define BR_MULTICAST_FAST_LEAVE 0x00000008
155 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
156 u32 multicast_startup_queries_sent
;
157 unsigned char multicast_router
;
158 struct timer_list multicast_router_timer
;
159 struct timer_list multicast_query_timer
;
160 struct hlist_head mglist
;
161 struct hlist_node rlist
;
165 char sysfs_name
[IFNAMSIZ
];
168 #ifdef CONFIG_NET_POLL_CONTROLLER
171 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
172 struct net_port_vlans __rcu
*vlan_info
;
176 #define br_port_exists(dev) (dev->priv_flags & IFF_BRIDGE_PORT)
178 static inline struct net_bridge_port
*br_port_get_rcu(const struct net_device
*dev
)
180 struct net_bridge_port
*port
=
181 rcu_dereference_rtnl(dev
->rx_handler_data
);
183 return br_port_exists(dev
) ? port
: NULL
;
186 static inline struct net_bridge_port
*br_port_get_rtnl(struct net_device
*dev
)
188 return br_port_exists(dev
) ?
189 rtnl_dereference(dev
->rx_handler_data
) : NULL
;
192 struct br_cpu_netstats
{
197 struct u64_stats_sync syncp
;
203 struct list_head port_list
;
204 struct net_device
*dev
;
206 struct br_cpu_netstats __percpu
*stats
;
207 spinlock_t hash_lock
;
208 struct hlist_head hash
[BR_HASH_SIZE
];
209 #ifdef CONFIG_BRIDGE_NETFILTER
210 struct rtable fake_rtable
;
211 bool nf_call_iptables
;
212 bool nf_call_ip6tables
;
213 bool nf_call_arptables
;
218 bridge_id designated_root
;
221 unsigned long max_age
;
222 unsigned long hello_time
;
223 unsigned long forward_delay
;
224 unsigned long bridge_max_age
;
225 unsigned long ageing_time
;
226 unsigned long bridge_hello_time
;
227 unsigned long bridge_forward_delay
;
229 u8 group_addr
[ETH_ALEN
];
233 BR_NO_STP
, /* no spanning tree */
234 BR_KERNEL_STP
, /* old STP in kernel */
235 BR_USER_STP
, /* new RSTP in userspace */
238 unsigned char topology_change
;
239 unsigned char topology_change_detected
;
241 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
242 unsigned char multicast_router
;
244 u8 multicast_disabled
:1;
245 u8 multicast_querier
:1;
250 u32 multicast_last_member_count
;
251 u32 multicast_startup_queries_sent
;
252 u32 multicast_startup_query_count
;
254 unsigned long multicast_last_member_interval
;
255 unsigned long multicast_membership_interval
;
256 unsigned long multicast_querier_interval
;
257 unsigned long multicast_query_interval
;
258 unsigned long multicast_query_response_interval
;
259 unsigned long multicast_startup_query_interval
;
261 spinlock_t multicast_lock
;
262 struct net_bridge_mdb_htable __rcu
*mdb
;
263 struct hlist_head router_list
;
265 struct timer_list multicast_router_timer
;
266 struct timer_list multicast_querier_timer
;
267 struct timer_list multicast_query_timer
;
270 struct timer_list hello_timer
;
271 struct timer_list tcn_timer
;
272 struct timer_list topology_change_timer
;
273 struct timer_list gc_timer
;
274 struct kobject
*ifobj
;
275 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
277 struct net_port_vlans __rcu
*vlan_info
;
281 struct br_input_skb_cb
{
282 struct net_device
*brdev
;
283 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
289 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
291 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
292 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
294 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
297 #define br_printk(level, br, format, args...) \
298 printk(level "%s: " format, (br)->dev->name, ##args)
300 #define br_err(__br, format, args...) \
301 br_printk(KERN_ERR, __br, format, ##args)
302 #define br_warn(__br, format, args...) \
303 br_printk(KERN_WARNING, __br, format, ##args)
304 #define br_notice(__br, format, args...) \
305 br_printk(KERN_NOTICE, __br, format, ##args)
306 #define br_info(__br, format, args...) \
307 br_printk(KERN_INFO, __br, format, ##args)
309 #define br_debug(br, format, args...) \
310 pr_debug("%s: " format, (br)->dev->name, ##args)
312 extern struct notifier_block br_device_notifier
;
314 /* called under bridge lock */
315 static inline int br_is_root_bridge(const struct net_bridge
*br
)
317 return !memcmp(&br
->bridge_id
, &br
->designated_root
, 8);
321 extern void br_dev_setup(struct net_device
*dev
);
322 extern void br_dev_delete(struct net_device
*dev
, struct list_head
*list
);
323 extern netdev_tx_t
br_dev_xmit(struct sk_buff
*skb
,
324 struct net_device
*dev
);
325 #ifdef CONFIG_NET_POLL_CONTROLLER
326 static inline struct netpoll_info
*br_netpoll_info(struct net_bridge
*br
)
328 return br
->dev
->npinfo
;
331 static inline void br_netpoll_send_skb(const struct net_bridge_port
*p
,
334 struct netpoll
*np
= p
->np
;
337 netpoll_send_skb(np
, skb
);
340 extern int br_netpoll_enable(struct net_bridge_port
*p
, gfp_t gfp
);
341 extern void br_netpoll_disable(struct net_bridge_port
*p
);
343 static inline struct netpoll_info
*br_netpoll_info(struct net_bridge
*br
)
348 static inline void br_netpoll_send_skb(const struct net_bridge_port
*p
,
353 static inline int br_netpoll_enable(struct net_bridge_port
*p
, gfp_t gfp
)
358 static inline void br_netpoll_disable(struct net_bridge_port
*p
)
364 extern int br_fdb_init(void);
365 extern void br_fdb_fini(void);
366 extern void br_fdb_flush(struct net_bridge
*br
);
367 extern void br_fdb_changeaddr(struct net_bridge_port
*p
,
368 const unsigned char *newaddr
);
369 extern void br_fdb_change_mac_address(struct net_bridge
*br
, const u8
*newaddr
);
370 extern void br_fdb_cleanup(unsigned long arg
);
371 extern void br_fdb_delete_by_port(struct net_bridge
*br
,
372 const struct net_bridge_port
*p
, int do_all
);
373 extern struct net_bridge_fdb_entry
*__br_fdb_get(struct net_bridge
*br
,
374 const unsigned char *addr
);
375 extern int br_fdb_test_addr(struct net_device
*dev
, unsigned char *addr
);
376 extern int br_fdb_fillbuf(struct net_bridge
*br
, void *buf
,
377 unsigned long count
, unsigned long off
);
378 extern int br_fdb_insert(struct net_bridge
*br
,
379 struct net_bridge_port
*source
,
380 const unsigned char *addr
);
381 extern void br_fdb_update(struct net_bridge
*br
,
382 struct net_bridge_port
*source
,
383 const unsigned char *addr
);
385 extern int br_fdb_delete(struct ndmsg
*ndm
,
386 struct net_device
*dev
,
387 const unsigned char *addr
);
388 extern int br_fdb_add(struct ndmsg
*nlh
, struct nlattr
*tb
[],
389 struct net_device
*dev
,
390 const unsigned char *addr
,
392 extern int br_fdb_dump(struct sk_buff
*skb
,
393 struct netlink_callback
*cb
,
394 struct net_device
*dev
,
398 extern void br_deliver(const struct net_bridge_port
*to
,
399 struct sk_buff
*skb
);
400 extern int br_dev_queue_push_xmit(struct sk_buff
*skb
);
401 extern void br_forward(const struct net_bridge_port
*to
,
402 struct sk_buff
*skb
, struct sk_buff
*skb0
);
403 extern int br_forward_finish(struct sk_buff
*skb
);
404 extern void br_flood_deliver(struct net_bridge
*br
, struct sk_buff
*skb
);
405 extern void br_flood_forward(struct net_bridge
*br
, struct sk_buff
*skb
,
406 struct sk_buff
*skb2
);
409 extern void br_port_carrier_check(struct net_bridge_port
*p
);
410 extern int br_add_bridge(struct net
*net
, const char *name
);
411 extern int br_del_bridge(struct net
*net
, const char *name
);
412 extern void br_net_exit(struct net
*net
);
413 extern int br_add_if(struct net_bridge
*br
,
414 struct net_device
*dev
);
415 extern int br_del_if(struct net_bridge
*br
,
416 struct net_device
*dev
);
417 extern int br_min_mtu(const struct net_bridge
*br
);
418 extern netdev_features_t
br_features_recompute(struct net_bridge
*br
,
419 netdev_features_t features
);
422 extern int br_handle_frame_finish(struct sk_buff
*skb
);
423 extern rx_handler_result_t
br_handle_frame(struct sk_buff
**pskb
);
426 extern int br_dev_ioctl(struct net_device
*dev
, struct ifreq
*rq
, int cmd
);
427 extern int br_ioctl_deviceless_stub(struct net
*net
, unsigned int cmd
, void __user
*arg
);
430 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
431 extern unsigned int br_mdb_rehash_seq
;
432 extern int br_multicast_rcv(struct net_bridge
*br
,
433 struct net_bridge_port
*port
,
434 struct sk_buff
*skb
);
435 extern struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
436 struct sk_buff
*skb
);
437 extern void br_multicast_add_port(struct net_bridge_port
*port
);
438 extern void br_multicast_del_port(struct net_bridge_port
*port
);
439 extern void br_multicast_enable_port(struct net_bridge_port
*port
);
440 extern void br_multicast_disable_port(struct net_bridge_port
*port
);
441 extern void br_multicast_init(struct net_bridge
*br
);
442 extern void br_multicast_open(struct net_bridge
*br
);
443 extern void br_multicast_stop(struct net_bridge
*br
);
444 extern void br_multicast_deliver(struct net_bridge_mdb_entry
*mdst
,
445 struct sk_buff
*skb
);
446 extern void br_multicast_forward(struct net_bridge_mdb_entry
*mdst
,
447 struct sk_buff
*skb
, struct sk_buff
*skb2
);
448 extern int br_multicast_set_router(struct net_bridge
*br
, unsigned long val
);
449 extern int br_multicast_set_port_router(struct net_bridge_port
*p
,
451 extern int br_multicast_toggle(struct net_bridge
*br
, unsigned long val
);
452 extern int br_multicast_set_querier(struct net_bridge
*br
, unsigned long val
);
453 extern int br_multicast_set_hash_max(struct net_bridge
*br
, unsigned long val
);
454 extern struct net_bridge_mdb_entry
*br_mdb_ip_get(
455 struct net_bridge_mdb_htable
*mdb
,
457 extern struct net_bridge_mdb_entry
*br_multicast_new_group(struct net_bridge
*br
,
458 struct net_bridge_port
*port
, struct br_ip
*group
);
459 extern void br_multicast_free_pg(struct rcu_head
*head
);
460 extern struct net_bridge_port_group
*br_multicast_new_port_group(
461 struct net_bridge_port
*port
,
463 struct net_bridge_port_group
*next
,
464 unsigned char state
);
465 extern void br_mdb_init(void);
466 extern void br_mdb_uninit(void);
467 extern void br_mdb_notify(struct net_device
*dev
, struct net_bridge_port
*port
,
468 struct br_ip
*group
, int type
);
470 #define mlock_dereference(X, br) \
471 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
473 #if IS_ENABLED(CONFIG_IPV6)
474 #include <net/addrconf.h>
475 static inline int ipv6_is_transient_multicast(const struct in6_addr
*addr
)
477 if (ipv6_addr_is_multicast(addr
) && IPV6_ADDR_MC_FLAG_TRANSIENT(addr
))
483 static inline bool br_multicast_is_router(struct net_bridge
*br
)
485 return br
->multicast_router
== 2 ||
486 (br
->multicast_router
== 1 &&
487 timer_pending(&br
->multicast_router_timer
));
490 static inline int br_multicast_rcv(struct net_bridge
*br
,
491 struct net_bridge_port
*port
,
497 static inline struct net_bridge_mdb_entry
*br_mdb_get(struct net_bridge
*br
,
503 static inline void br_multicast_add_port(struct net_bridge_port
*port
)
507 static inline void br_multicast_del_port(struct net_bridge_port
*port
)
511 static inline void br_multicast_enable_port(struct net_bridge_port
*port
)
515 static inline void br_multicast_disable_port(struct net_bridge_port
*port
)
519 static inline void br_multicast_init(struct net_bridge
*br
)
523 static inline void br_multicast_open(struct net_bridge
*br
)
527 static inline void br_multicast_stop(struct net_bridge
*br
)
531 static inline void br_multicast_deliver(struct net_bridge_mdb_entry
*mdst
,
536 static inline void br_multicast_forward(struct net_bridge_mdb_entry
*mdst
,
538 struct sk_buff
*skb2
)
541 static inline bool br_multicast_is_router(struct net_bridge
*br
)
545 static inline void br_mdb_init(void)
548 static inline void br_mdb_uninit(void)
554 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
555 extern bool br_allowed_ingress(struct net_bridge
*br
, struct net_port_vlans
*v
,
556 struct sk_buff
*skb
);
557 extern bool br_allowed_egress(struct net_bridge
*br
,
558 const struct net_port_vlans
*v
,
559 const struct sk_buff
*skb
);
560 extern int br_vlan_add(struct net_bridge
*br
, u16 vid
);
561 extern int br_vlan_delete(struct net_bridge
*br
, u16 vid
);
562 extern void br_vlan_flush(struct net_bridge
*br
);
563 extern int br_vlan_filter_toggle(struct net_bridge
*br
, unsigned long val
);
564 extern int nbp_vlan_add(struct net_bridge_port
*port
, u16 vid
);
565 extern int nbp_vlan_delete(struct net_bridge_port
*port
, u16 vid
);
566 extern void nbp_vlan_flush(struct net_bridge_port
*port
);
568 static inline struct net_port_vlans
*br_get_vlan_info(
569 const struct net_bridge
*br
)
571 return rcu_dereference(br
->vlan_info
);
574 static inline struct net_port_vlans
*nbp_get_vlan_info(
575 const struct net_bridge_port
*p
)
577 return rcu_dereference(p
->vlan_info
);
580 /* Since bridge now depends on 8021Q module, but the time bridge sees the
581 * skb, the vlan tag will always be present if the frame was tagged.
583 static inline int br_vlan_get_tag(const struct sk_buff
*skb
, u16
*vid
)
587 if (vlan_tx_tag_present(skb
))
588 *vid
= vlan_tx_tag_get(skb
) & VLAN_VID_MASK
;
597 static inline bool br_allowed_ingress(struct net_bridge
*br
,
598 struct net_port_vlans
*v
,
604 static inline bool br_allowed_egress(struct net_bridge
*br
,
605 const struct net_port_vlans
*v
,
606 const struct sk_buff
*skb
)
611 static inline int br_vlan_add(struct net_bridge
*br
, u16 vid
)
616 static inline int br_vlan_delete(struct net_bridge
*br
, u16 vid
)
621 static inline void br_vlan_flush(struct net_bridge
*br
)
625 static inline int nbp_vlan_add(struct net_bridge_port
*port
, u16 vid
)
630 static inline int nbp_vlan_delete(struct net_bridge_port
*port
, u16 vid
)
635 static inline void nbp_vlan_flush(struct net_bridge_port
*port
)
639 static inline struct net_port_vlans
*br_get_vlan_info(
640 const struct net_bridge
*br
)
644 static inline struct net_port_vlans
*nbp_get_vlan_info(
645 const struct net_bridge_port
*p
)
650 static inline u16
br_vlan_get_tag(const struct sk_buff
*skb
)
657 #ifdef CONFIG_BRIDGE_NETFILTER
658 extern int br_netfilter_init(void);
659 extern void br_netfilter_fini(void);
660 extern void br_netfilter_rtable_init(struct net_bridge
*);
662 #define br_netfilter_init() (0)
663 #define br_netfilter_fini() do { } while(0)
664 #define br_netfilter_rtable_init(x)
668 extern void br_log_state(const struct net_bridge_port
*p
);
669 extern struct net_bridge_port
*br_get_port(struct net_bridge
*br
,
671 extern void br_init_port(struct net_bridge_port
*p
);
672 extern void br_become_designated_port(struct net_bridge_port
*p
);
674 extern int br_set_forward_delay(struct net_bridge
*br
, unsigned long x
);
675 extern int br_set_hello_time(struct net_bridge
*br
, unsigned long x
);
676 extern int br_set_max_age(struct net_bridge
*br
, unsigned long x
);
680 extern void br_stp_enable_bridge(struct net_bridge
*br
);
681 extern void br_stp_disable_bridge(struct net_bridge
*br
);
682 extern void br_stp_set_enabled(struct net_bridge
*br
, unsigned long val
);
683 extern void br_stp_enable_port(struct net_bridge_port
*p
);
684 extern void br_stp_disable_port(struct net_bridge_port
*p
);
685 extern bool br_stp_recalculate_bridge_id(struct net_bridge
*br
);
686 extern void br_stp_change_bridge_id(struct net_bridge
*br
, const unsigned char *a
);
687 extern void br_stp_set_bridge_priority(struct net_bridge
*br
,
689 extern int br_stp_set_port_priority(struct net_bridge_port
*p
,
690 unsigned long newprio
);
691 extern int br_stp_set_path_cost(struct net_bridge_port
*p
,
692 unsigned long path_cost
);
693 extern ssize_t
br_show_bridge_id(char *buf
, const struct bridge_id
*id
);
697 extern void br_stp_rcv(const struct stp_proto
*proto
, struct sk_buff
*skb
,
698 struct net_device
*dev
);
701 extern void br_stp_timer_init(struct net_bridge
*br
);
702 extern void br_stp_port_timer_init(struct net_bridge_port
*p
);
703 extern unsigned long br_timer_value(const struct timer_list
*timer
);
706 #if IS_ENABLED(CONFIG_ATM_LANE)
707 extern int (*br_fdb_test_addr_hook
)(struct net_device
*dev
, unsigned char *addr
);
711 extern struct rtnl_link_ops br_link_ops
;
712 extern int br_netlink_init(void);
713 extern void br_netlink_fini(void);
714 extern void br_ifinfo_notify(int event
, struct net_bridge_port
*port
);
715 extern int br_setlink(struct net_device
*dev
, struct nlmsghdr
*nlmsg
);
716 extern int br_dellink(struct net_device
*dev
, struct nlmsghdr
*nlmsg
);
717 extern int br_getlink(struct sk_buff
*skb
, u32 pid
, u32 seq
,
718 struct net_device
*dev
);
722 extern const struct sysfs_ops brport_sysfs_ops
;
723 extern int br_sysfs_addif(struct net_bridge_port
*p
);
724 extern int br_sysfs_renameif(struct net_bridge_port
*p
);
727 extern int br_sysfs_addbr(struct net_device
*dev
);
728 extern void br_sysfs_delbr(struct net_device
*dev
);
732 static inline int br_sysfs_addif(struct net_bridge_port
*p
) { return 0; }
733 static inline int br_sysfs_renameif(struct net_bridge_port
*p
) { return 0; }
734 static inline int br_sysfs_addbr(struct net_device
*dev
) { return 0; }
735 static inline void br_sysfs_delbr(struct net_device
*dev
) { return; }
736 #endif /* CONFIG_SYSFS */