1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
12 #include <linux/netdevice.h>
13 #include <linux/if_bridge.h>
14 #include <linux/netpoll.h>
15 #include <linux/u64_stats_sync.h>
16 #include <net/route.h>
17 #include <net/ip6_fib.h>
18 #include <linux/if_vlan.h>
19 #include <linux/rhashtable.h>
20 #include <linux/refcount.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_MULTICAST_DEFAULT_HASH_MAX 4096
32 #define BR_VERSION "2.3"
34 /* Control of forwarding link local multicast */
35 #define BR_GROUPFWD_DEFAULT 0
36 /* Don't allow forwarding of control protocols like STP, MAC PAUSE and LACP */
38 BR_GROUPFWD_STP = BIT(0),
39 BR_GROUPFWD_MACPAUSE = BIT(1),
40 BR_GROUPFWD_LACP = BIT(2),
43 #define BR_GROUPFWD_RESTRICTED (BR_GROUPFWD_STP | BR_GROUPFWD_MACPAUSE | \
45 /* The Nearest Customer Bridge Group Address, 01-80-C2-00-00-[00,0B,0C,0D,0F] */
46 #define BR_GROUPFWD_8021AD 0xB801u
48 /* Path to usermode spanning tree program */
49 #define BR_STP_PROG "/sbin/bridge-stp"
51 typedef struct bridge_id bridge_id;
52 typedef struct mac_addr mac_addr;
53 typedef __u16 port_id;
56 unsigned char prio[2];
57 unsigned char addr[ETH_ALEN];
61 unsigned char addr[ETH_ALEN];
64 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
66 struct bridge_mcast_own_query {
67 struct timer_list timer;
72 struct bridge_mcast_other_query {
73 struct timer_list timer;
74 unsigned long delay_time;
77 /* selected querier */
78 struct bridge_mcast_querier {
80 struct net_bridge_port __rcu *port;
83 /* IGMP/MLD statistics */
84 struct bridge_mcast_stats {
85 struct br_mcast_stats mstats;
86 struct u64_stats_sync syncp;
90 struct br_vlan_stats {
95 struct u64_stats_sync syncp;
98 struct br_tunnel_info {
100 struct metadata_dst *tunnel_dst;
103 /* private vlan flags */
105 BR_VLFLAG_PER_PORT_STATS = BIT(0),
106 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
110 * struct net_bridge_vlan - per-vlan entry
112 * @vnode: rhashtable member
114 * @flags: bridge vlan flags
115 * @priv_flags: private (in-kernel) bridge vlan flags
116 * @state: STP state (e.g. blocking, learning, forwarding)
117 * @stats: per-cpu VLAN statistics
118 * @br: if MASTER flag set, this points to a bridge struct
119 * @port: if MASTER flag unset, this points to a port struct
120 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
121 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
122 * for this VLAN entry
123 * @vlist: sorted list of VLAN entries
124 * @rcu: used for entry destruction
126 * This structure is shared between the global per-VLAN entries contained in
127 * the bridge rhashtable and the local per-port per-VLAN entries contained in
128 * the port's rhashtable. The union entries should be interpreted depending on
129 * the entry flags that are set.
131 struct net_bridge_vlan {
132 struct rhash_head vnode;
133 struct rhash_head tnode;
138 struct br_vlan_stats __percpu *stats;
140 struct net_bridge *br;
141 struct net_bridge_port *port;
145 struct net_bridge_vlan *brvlan;
148 struct br_tunnel_info tinfo;
150 struct list_head vlist;
156 * struct net_bridge_vlan_group
158 * @vlan_hash: VLAN entry rhashtable
159 * @vlan_list: sorted VLAN entry list
160 * @num_vlans: number of total VLAN entries
161 * @pvid: PVID VLAN id
162 * @pvid_state: PVID's STP state (e.g. forwarding, learning, blocking)
164 * IMPORTANT: Be careful when checking if there're VLAN entries using list
165 * primitives because the bridge can have entries in its list which
166 * are just for global context but not for filtering, i.e. they have
167 * the master flag set but not the brentry flag. If you have to check
168 * if there're "real" entries in the bridge please test @num_vlans
170 struct net_bridge_vlan_group {
171 struct rhashtable vlan_hash;
172 struct rhashtable tunnel_hash;
173 struct list_head vlan_list;
179 /* bridge fdb flags */
184 BR_FDB_ADDED_BY_USER,
185 BR_FDB_ADDED_BY_EXT_LEARN,
189 struct net_bridge_fdb_key {
194 struct net_bridge_fdb_entry {
195 struct rhash_head rhnode;
196 struct net_bridge_port *dst;
198 struct net_bridge_fdb_key key;
199 struct hlist_node fdb_node;
202 /* write-heavy members should not affect lookups */
203 unsigned long updated ____cacheline_aligned_in_smp;
209 #define MDB_PG_FLAGS_PERMANENT BIT(0)
210 #define MDB_PG_FLAGS_OFFLOAD BIT(1)
211 #define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
213 struct net_bridge_port_group {
214 struct net_bridge_port *port;
215 struct net_bridge_port_group __rcu *next;
216 struct hlist_node mglist;
218 struct timer_list timer;
221 unsigned char eth_addr[ETH_ALEN];
224 struct net_bridge_mdb_entry {
225 struct rhash_head rhnode;
226 struct net_bridge *br;
227 struct net_bridge_port_group __rcu *ports;
229 struct timer_list timer;
232 struct hlist_node mdb_node;
235 struct net_bridge_port {
236 struct net_bridge *br;
237 struct net_device *dev;
238 struct list_head list;
241 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
242 struct net_bridge_vlan_group __rcu *vlgrp;
244 struct net_bridge_port __rcu *backup_port;
250 unsigned char topology_change_ack;
251 unsigned char config_pending;
253 port_id designated_port;
254 bridge_id designated_root;
255 bridge_id designated_bridge;
258 unsigned long designated_age;
260 struct timer_list forward_delay_timer;
261 struct timer_list hold_timer;
262 struct timer_list message_age_timer;
266 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
267 struct bridge_mcast_own_query ip4_own_query;
268 #if IS_ENABLED(CONFIG_IPV6)
269 struct bridge_mcast_own_query ip6_own_query;
270 #endif /* IS_ENABLED(CONFIG_IPV6) */
271 unsigned char multicast_router;
272 struct bridge_mcast_stats __percpu *mcast_stats;
273 struct timer_list multicast_router_timer;
274 struct hlist_head mglist;
275 struct hlist_node rlist;
279 char sysfs_name[IFNAMSIZ];
282 #ifdef CONFIG_NET_POLL_CONTROLLER
285 #ifdef CONFIG_NET_SWITCHDEV
286 int offload_fwd_mark;
289 u16 backup_redirected_cnt;
291 struct bridge_stp_xstats stp_xstats;
294 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
296 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
297 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
299 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
301 return rcu_dereference(dev->rx_handler_data);
304 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
306 return netif_is_bridge_port(dev) ?
307 rtnl_dereference(dev->rx_handler_data) : NULL;
310 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
312 return netif_is_bridge_port(dev) ?
313 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
316 enum net_bridge_opts {
318 BROPT_VLAN_STATS_ENABLED,
319 BROPT_NF_CALL_IPTABLES,
320 BROPT_NF_CALL_IP6TABLES,
321 BROPT_NF_CALL_ARPTABLES,
322 BROPT_GROUP_ADDR_SET,
323 BROPT_MULTICAST_ENABLED,
324 BROPT_MULTICAST_QUERIER,
325 BROPT_MULTICAST_QUERY_USE_IFADDR,
326 BROPT_MULTICAST_STATS_ENABLED,
328 BROPT_NEIGH_SUPPRESS_ENABLED,
329 BROPT_MTU_SET_BY_USER,
330 BROPT_VLAN_STATS_PER_PORT,
332 BROPT_VLAN_BRIDGE_BINDING,
337 spinlock_t hash_lock;
338 struct list_head port_list;
339 struct net_device *dev;
340 struct pcpu_sw_netstats __percpu *stats;
341 unsigned long options;
342 /* These fields are accessed on each packet */
343 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
346 struct net_bridge_vlan_group __rcu *vlgrp;
349 struct rhashtable fdb_hash_tbl;
350 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
352 struct rtable fake_rtable;
353 struct rt6_info fake_rt6_info;
357 u16 group_fwd_mask_required;
360 bridge_id designated_root;
362 unsigned char topology_change;
363 unsigned char topology_change_detected;
365 unsigned long max_age;
366 unsigned long hello_time;
367 unsigned long forward_delay;
368 unsigned long ageing_time;
369 unsigned long bridge_max_age;
370 unsigned long bridge_hello_time;
371 unsigned long bridge_forward_delay;
372 unsigned long bridge_ageing_time;
375 u8 group_addr[ETH_ALEN];
378 BR_NO_STP, /* no spanning tree */
379 BR_KERNEL_STP, /* old STP in kernel */
380 BR_USER_STP, /* new RSTP in userspace */
383 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
387 u32 multicast_last_member_count;
388 u32 multicast_startup_query_count;
390 u8 multicast_igmp_version;
392 #if IS_ENABLED(CONFIG_IPV6)
393 u8 multicast_mld_version;
395 spinlock_t multicast_lock;
396 unsigned long multicast_last_member_interval;
397 unsigned long multicast_membership_interval;
398 unsigned long multicast_querier_interval;
399 unsigned long multicast_query_interval;
400 unsigned long multicast_query_response_interval;
401 unsigned long multicast_startup_query_interval;
403 struct rhashtable mdb_hash_tbl;
405 struct hlist_head mdb_list;
406 struct hlist_head router_list;
408 struct timer_list multicast_router_timer;
409 struct bridge_mcast_other_query ip4_other_query;
410 struct bridge_mcast_own_query ip4_own_query;
411 struct bridge_mcast_querier ip4_querier;
412 struct bridge_mcast_stats __percpu *mcast_stats;
413 #if IS_ENABLED(CONFIG_IPV6)
414 struct bridge_mcast_other_query ip6_other_query;
415 struct bridge_mcast_own_query ip6_own_query;
416 struct bridge_mcast_querier ip6_querier;
417 #endif /* IS_ENABLED(CONFIG_IPV6) */
420 struct timer_list hello_timer;
421 struct timer_list tcn_timer;
422 struct timer_list topology_change_timer;
423 struct delayed_work gc_work;
424 struct kobject *ifobj;
427 #ifdef CONFIG_NET_SWITCHDEV
428 int offload_fwd_mark;
430 struct hlist_head fdb_list;
433 struct br_input_skb_cb {
434 struct net_device *brdev;
437 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
441 u8 proxyarp_replied:1;
442 u8 src_port_isolated:1;
443 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
446 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
447 u8 br_netfilter_broute:1;
450 #ifdef CONFIG_NET_SWITCHDEV
451 int offload_fwd_mark;
455 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
457 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
458 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
460 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
463 #define br_printk(level, br, format, args...) \
464 printk(level "%s: " format, (br)->dev->name, ##args)
466 #define br_err(__br, format, args...) \
467 br_printk(KERN_ERR, __br, format, ##args)
468 #define br_warn(__br, format, args...) \
469 br_printk(KERN_WARNING, __br, format, ##args)
470 #define br_notice(__br, format, args...) \
471 br_printk(KERN_NOTICE, __br, format, ##args)
472 #define br_info(__br, format, args...) \
473 br_printk(KERN_INFO, __br, format, ##args)
475 #define br_debug(br, format, args...) \
476 pr_debug("%s: " format, (br)->dev->name, ##args)
478 /* called under bridge lock */
479 static inline int br_is_root_bridge(const struct net_bridge *br)
481 return !memcmp(&br->bridge_id, &br->designated_root, 8);
484 /* check if a VLAN entry is global */
485 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
487 return v->flags & BRIDGE_VLAN_INFO_MASTER;
490 /* check if a VLAN entry is used by the bridge */
491 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
493 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
496 /* check if we should use the vlan entry, returns false if it's only context */
497 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
499 if (br_vlan_is_master(v)) {
500 if (br_vlan_is_brentry(v))
509 static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
511 return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
514 static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
516 bool ret = vid > 0 && vid < VLAN_VID_MASK;
519 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
524 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
525 const struct bridge_vlan_info *last,
526 struct netlink_ext_ack *extack)
528 /* pvid flag is not allowed in ranges */
529 if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
530 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
534 /* when cur is the range end, check if:
535 * - it has range start flag
536 * - range ids are invalid (end is equal to or before start)
539 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
540 NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
542 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
543 NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
545 } else if (cur->vid <= last->vid) {
546 NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
551 /* check for required range flags */
552 if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
553 BRIDGE_VLAN_INFO_RANGE_END))) {
554 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
561 static inline int br_afspec_cmd_to_rtm(int cmd)
573 static inline int br_opt_get(const struct net_bridge *br,
574 enum net_bridge_opts opt)
576 return test_bit(opt, &br->options);
579 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
580 struct netlink_ext_ack *extack);
581 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
582 int br_boolopt_multi_toggle(struct net_bridge *br,
583 struct br_boolopt_multi *bm,
584 struct netlink_ext_ack *extack);
585 void br_boolopt_multi_get(const struct net_bridge *br,
586 struct br_boolopt_multi *bm);
587 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
590 void br_dev_setup(struct net_device *dev);
591 void br_dev_delete(struct net_device *dev, struct list_head *list);
592 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
593 #ifdef CONFIG_NET_POLL_CONTROLLER
594 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
597 struct netpoll *np = p->np;
600 netpoll_send_skb(np, skb);
603 int br_netpoll_enable(struct net_bridge_port *p);
604 void br_netpoll_disable(struct net_bridge_port *p);
606 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
611 static inline int br_netpoll_enable(struct net_bridge_port *p)
616 static inline void br_netpoll_disable(struct net_bridge_port *p)
622 int br_fdb_init(void);
623 void br_fdb_fini(void);
624 int br_fdb_hash_init(struct net_bridge *br);
625 void br_fdb_hash_fini(struct net_bridge *br);
626 void br_fdb_flush(struct net_bridge *br);
627 void br_fdb_find_delete_local(struct net_bridge *br,
628 const struct net_bridge_port *p,
629 const unsigned char *addr, u16 vid);
630 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
631 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
632 void br_fdb_cleanup(struct work_struct *work);
633 void br_fdb_delete_by_port(struct net_bridge *br,
634 const struct net_bridge_port *p, u16 vid, int do_all);
635 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
636 const unsigned char *addr,
638 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
639 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
641 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
642 const unsigned char *addr, u16 vid);
643 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
644 const unsigned char *addr, u16 vid, unsigned long flags);
646 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
647 struct net_device *dev, const unsigned char *addr, u16 vid);
648 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
649 const unsigned char *addr, u16 vid, u16 nlh_flags,
650 struct netlink_ext_ack *extack);
651 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
652 struct net_device *dev, struct net_device *fdev, int *idx);
653 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
654 const unsigned char *addr, u16 vid, u32 portid, u32 seq,
655 struct netlink_ext_ack *extack);
656 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
657 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
658 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
659 const unsigned char *addr, u16 vid,
661 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
662 const unsigned char *addr, u16 vid,
664 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
665 const unsigned char *addr, u16 vid, bool offloaded);
673 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
674 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
675 bool local_rcv, bool local_orig);
676 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
677 void br_flood(struct net_bridge *br, struct sk_buff *skb,
678 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
680 /* return true if both source port and dest port are isolated */
681 static inline bool br_skb_isolated(const struct net_bridge_port *to,
682 const struct sk_buff *skb)
684 return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
685 (to->flags & BR_ISOLATED);
689 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
690 int br_add_bridge(struct net *net, const char *name);
691 int br_del_bridge(struct net *net, const char *name);
692 int br_add_if(struct net_bridge *br, struct net_device *dev,
693 struct netlink_ext_ack *extack);
694 int br_del_if(struct net_bridge *br, struct net_device *dev);
695 void br_mtu_auto_adjust(struct net_bridge *br);
696 netdev_features_t br_features_recompute(struct net_bridge *br,
697 netdev_features_t features);
698 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
699 void br_manage_promisc(struct net_bridge *br);
700 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
703 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
704 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
706 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
708 return rcu_dereference(dev->rx_handler) == br_handle_frame;
711 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
713 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
716 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
718 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
721 static inline struct net_bridge_port *
722 br_port_get_check_rtnl(const struct net_device *dev)
724 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
728 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
729 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
733 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
734 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
735 struct sk_buff *skb, u16 vid);
736 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
737 struct sk_buff *skb, u16 vid);
738 int br_multicast_add_port(struct net_bridge_port *port);
739 void br_multicast_del_port(struct net_bridge_port *port);
740 void br_multicast_enable_port(struct net_bridge_port *port);
741 void br_multicast_disable_port(struct net_bridge_port *port);
742 void br_multicast_init(struct net_bridge *br);
743 void br_multicast_open(struct net_bridge *br);
744 void br_multicast_stop(struct net_bridge *br);
745 void br_multicast_dev_del(struct net_bridge *br);
746 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
747 struct sk_buff *skb, bool local_rcv, bool local_orig);
748 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
749 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
750 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
751 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
752 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
753 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
754 #if IS_ENABLED(CONFIG_IPV6)
755 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
757 struct net_bridge_mdb_entry *
758 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
759 struct net_bridge_mdb_entry *
760 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
761 struct net_bridge_port_group *
762 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
763 struct net_bridge_port_group __rcu *next,
764 unsigned char flags, const unsigned char *src);
765 int br_mdb_hash_init(struct net_bridge *br);
766 void br_mdb_hash_fini(struct net_bridge *br);
767 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
768 struct br_ip *group, int type, u8 flags);
769 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
771 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
772 const struct sk_buff *skb, u8 type, u8 dir);
773 int br_multicast_init_stats(struct net_bridge *br);
774 void br_multicast_uninit_stats(struct net_bridge *br);
775 void br_multicast_get_stats(const struct net_bridge *br,
776 const struct net_bridge_port *p,
777 struct br_mcast_stats *dest);
778 void br_mdb_init(void);
779 void br_mdb_uninit(void);
780 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
781 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
783 #define mlock_dereference(X, br) \
784 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
786 static inline bool br_multicast_is_router(struct net_bridge *br)
788 return br->multicast_router == 2 ||
789 (br->multicast_router == 1 &&
790 timer_pending(&br->multicast_router_timer));
794 __br_multicast_querier_exists(struct net_bridge *br,
795 struct bridge_mcast_other_query *querier,
798 bool own_querier_enabled;
800 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
801 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
802 own_querier_enabled = false;
804 own_querier_enabled = true;
806 own_querier_enabled = false;
809 return time_is_before_jiffies(querier->delay_time) &&
810 (own_querier_enabled || timer_pending(&querier->timer));
813 static inline bool br_multicast_querier_exists(struct net_bridge *br,
816 switch (eth->h_proto) {
817 case (htons(ETH_P_IP)):
818 return __br_multicast_querier_exists(br,
819 &br->ip4_other_query, false);
820 #if IS_ENABLED(CONFIG_IPV6)
821 case (htons(ETH_P_IPV6)):
822 return __br_multicast_querier_exists(br,
823 &br->ip6_other_query, true);
830 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
832 return BR_INPUT_SKB_CB(skb)->igmp;
835 static inline int br_multicast_rcv(struct net_bridge *br,
836 struct net_bridge_port *port,
843 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
844 struct sk_buff *skb, u16 vid)
849 static inline int br_multicast_add_port(struct net_bridge_port *port)
854 static inline void br_multicast_del_port(struct net_bridge_port *port)
858 static inline void br_multicast_enable_port(struct net_bridge_port *port)
862 static inline void br_multicast_disable_port(struct net_bridge_port *port)
866 static inline void br_multicast_init(struct net_bridge *br)
870 static inline void br_multicast_open(struct net_bridge *br)
874 static inline void br_multicast_stop(struct net_bridge *br)
878 static inline void br_multicast_dev_del(struct net_bridge *br)
882 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
884 bool local_rcv, bool local_orig)
888 static inline bool br_multicast_is_router(struct net_bridge *br)
893 static inline bool br_multicast_querier_exists(struct net_bridge *br,
899 static inline void br_mdb_init(void)
903 static inline void br_mdb_uninit(void)
907 static inline int br_mdb_hash_init(struct net_bridge *br)
912 static inline void br_mdb_hash_fini(struct net_bridge *br)
916 static inline void br_multicast_count(struct net_bridge *br,
917 const struct net_bridge_port *p,
918 const struct sk_buff *skb,
923 static inline int br_multicast_init_stats(struct net_bridge *br)
928 static inline void br_multicast_uninit_stats(struct net_bridge *br)
932 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
939 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
940 bool br_allowed_ingress(const struct net_bridge *br,
941 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
942 u16 *vid, u8 *state);
943 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
944 const struct sk_buff *skb);
945 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
946 struct sk_buff *br_handle_vlan(struct net_bridge *br,
947 const struct net_bridge_port *port,
948 struct net_bridge_vlan_group *vg,
949 struct sk_buff *skb);
950 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
951 bool *changed, struct netlink_ext_ack *extack);
952 int br_vlan_delete(struct net_bridge *br, u16 vid);
953 void br_vlan_flush(struct net_bridge *br);
954 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
955 void br_recalculate_fwd_mask(struct net_bridge *br);
956 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
957 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
958 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
959 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
960 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
961 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
962 int br_vlan_init(struct net_bridge *br);
963 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
964 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
965 struct netlink_ext_ack *extack);
966 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
967 bool *changed, struct netlink_ext_ack *extack);
968 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
969 void nbp_vlan_flush(struct net_bridge_port *port);
970 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
971 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
972 void br_vlan_get_stats(const struct net_bridge_vlan *v,
973 struct br_vlan_stats *stats);
974 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
975 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
977 void br_vlan_rtnl_init(void);
978 void br_vlan_rtnl_uninit(void);
979 void br_vlan_notify(const struct net_bridge *br,
980 const struct net_bridge_port *p,
981 u16 vid, u16 vid_range,
983 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
984 const struct net_bridge_vlan *range_end);
986 static inline struct net_bridge_vlan_group *br_vlan_group(
987 const struct net_bridge *br)
989 return rtnl_dereference(br->vlgrp);
992 static inline struct net_bridge_vlan_group *nbp_vlan_group(
993 const struct net_bridge_port *p)
995 return rtnl_dereference(p->vlgrp);
998 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
999 const struct net_bridge *br)
1001 return rcu_dereference(br->vlgrp);
1004 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1005 const struct net_bridge_port *p)
1007 return rcu_dereference(p->vlgrp);
1010 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1011 * skb, the vlan tag will always be present if the frame was tagged.
1013 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1017 if (skb_vlan_tag_present(skb)) {
1018 *vid = skb_vlan_tag_get_id(skb);
1027 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1036 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1038 return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1041 static inline bool br_allowed_ingress(const struct net_bridge *br,
1042 struct net_bridge_vlan_group *vg,
1043 struct sk_buff *skb,
1044 u16 *vid, u8 *state)
1049 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1050 const struct sk_buff *skb)
1055 static inline bool br_should_learn(struct net_bridge_port *p,
1056 struct sk_buff *skb, u16 *vid)
1061 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1062 const struct net_bridge_port *port,
1063 struct net_bridge_vlan_group *vg,
1064 struct sk_buff *skb)
1069 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1070 bool *changed, struct netlink_ext_ack *extack)
1076 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1081 static inline void br_vlan_flush(struct net_bridge *br)
1085 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1089 static inline int br_vlan_init(struct net_bridge *br)
1094 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1095 bool *changed, struct netlink_ext_ack *extack)
1101 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1106 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1110 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1116 static inline int nbp_vlan_init(struct net_bridge_port *port,
1117 struct netlink_ext_ack *extack)
1122 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1127 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1132 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1138 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1144 static inline struct net_bridge_vlan_group *br_vlan_group(
1145 const struct net_bridge *br)
1150 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1151 const struct net_bridge_port *p)
1156 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1157 const struct net_bridge *br)
1162 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1163 const struct net_bridge_port *p)
1168 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1169 struct br_vlan_stats *stats)
1173 static inline void br_vlan_port_event(struct net_bridge_port *p,
1174 unsigned long event)
1178 static inline int br_vlan_bridge_event(struct net_device *dev,
1179 unsigned long event, void *ptr)
1184 static inline void br_vlan_rtnl_init(void)
1188 static inline void br_vlan_rtnl_uninit(void)
1192 static inline void br_vlan_notify(const struct net_bridge *br,
1193 const struct net_bridge_port *p,
1194 u16 vid, u16 vid_range,
1200 /* br_vlan_options.c */
1201 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1202 bool br_vlan_opts_eq(const struct net_bridge_vlan *v1,
1203 const struct net_bridge_vlan *v2);
1204 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1205 size_t br_vlan_opts_nl_size(void);
1206 int br_vlan_process_options(const struct net_bridge *br,
1207 const struct net_bridge_port *p,
1208 struct net_bridge_vlan *range_start,
1209 struct net_bridge_vlan *range_end,
1211 struct netlink_ext_ack *extack);
1213 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1214 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1216 return READ_ONCE(v->state);
1219 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1221 WRITE_ONCE(v->state, state);
1224 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1226 return READ_ONCE(vg->pvid_state);
1229 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1232 WRITE_ONCE(vg->pvid_state, state);
1235 /* learn_allow is true at ingress and false at egress */
1236 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1239 case BR_STATE_LEARNING:
1241 case BR_STATE_FORWARDING:
1250 int (*br_dev_xmit_hook)(struct sk_buff *skb);
1252 extern const struct nf_br_ops __rcu *nf_br_ops;
1254 /* br_netfilter.c */
1255 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1256 int br_nf_core_init(void);
1257 void br_nf_core_fini(void);
1258 void br_netfilter_rtable_init(struct net_bridge *);
1260 static inline int br_nf_core_init(void) { return 0; }
1261 static inline void br_nf_core_fini(void) {}
1262 #define br_netfilter_rtable_init(x)
1266 void br_set_state(struct net_bridge_port *p, unsigned int state);
1267 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1268 void br_init_port(struct net_bridge_port *p);
1269 void br_become_designated_port(struct net_bridge_port *p);
1271 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1272 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1273 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1274 int br_set_max_age(struct net_bridge *br, unsigned long x);
1275 int __set_ageing_time(struct net_device *dev, unsigned long t);
1276 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1280 void br_stp_enable_bridge(struct net_bridge *br);
1281 void br_stp_disable_bridge(struct net_bridge *br);
1282 void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
1283 void br_stp_enable_port(struct net_bridge_port *p);
1284 void br_stp_disable_port(struct net_bridge_port *p);
1285 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1286 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1287 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1288 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1289 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1290 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1294 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1295 struct net_device *dev);
1297 /* br_stp_timer.c */
1298 void br_stp_timer_init(struct net_bridge *br);
1299 void br_stp_port_timer_init(struct net_bridge_port *p);
1300 unsigned long br_timer_value(const struct timer_list *timer);
1303 #if IS_ENABLED(CONFIG_ATM_LANE)
1304 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1308 extern struct rtnl_link_ops br_link_ops;
1309 int br_netlink_init(void);
1310 void br_netlink_fini(void);
1311 void br_ifinfo_notify(int event, const struct net_bridge *br,
1312 const struct net_bridge_port *port);
1313 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1314 struct netlink_ext_ack *extack);
1315 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1316 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1317 u32 filter_mask, int nlflags);
1318 int br_process_vlan_info(struct net_bridge *br,
1319 struct net_bridge_port *p, int cmd,
1320 struct bridge_vlan_info *vinfo_curr,
1321 struct bridge_vlan_info **vinfo_last,
1323 struct netlink_ext_ack *extack);
1327 extern const struct sysfs_ops brport_sysfs_ops;
1328 int br_sysfs_addif(struct net_bridge_port *p);
1329 int br_sysfs_renameif(struct net_bridge_port *p);
1332 int br_sysfs_addbr(struct net_device *dev);
1333 void br_sysfs_delbr(struct net_device *dev);
1337 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1338 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1339 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1340 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1341 #endif /* CONFIG_SYSFS */
1343 /* br_switchdev.c */
1344 #ifdef CONFIG_NET_SWITCHDEV
1345 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1346 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1347 struct sk_buff *skb);
1348 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1349 const struct sk_buff *skb);
1350 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1351 unsigned long flags,
1352 unsigned long mask);
1353 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1355 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1356 struct netlink_ext_ack *extack);
1357 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1359 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1361 skb->offload_fwd_mark = 0;
1364 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1369 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1370 struct sk_buff *skb)
1374 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1375 const struct sk_buff *skb)
1380 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1381 unsigned long flags,
1387 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1389 struct netlink_ext_ack *extack)
1394 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1400 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1404 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1407 #endif /* CONFIG_NET_SWITCHDEV */
1409 /* br_arp_nd_proxy.c */
1410 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1411 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1412 u16 vid, struct net_bridge_port *p);
1413 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1414 u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1415 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);