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;
432 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
433 struct list_head __rcu mrp_list;
437 struct br_input_skb_cb {
438 struct net_device *brdev;
441 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
445 u8 proxyarp_replied:1;
446 u8 src_port_isolated:1;
447 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
450 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
451 u8 br_netfilter_broute:1;
454 #ifdef CONFIG_NET_SWITCHDEV
455 int offload_fwd_mark;
459 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
461 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
462 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
464 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
467 #define br_printk(level, br, format, args...) \
468 printk(level "%s: " format, (br)->dev->name, ##args)
470 #define br_err(__br, format, args...) \
471 br_printk(KERN_ERR, __br, format, ##args)
472 #define br_warn(__br, format, args...) \
473 br_printk(KERN_WARNING, __br, format, ##args)
474 #define br_notice(__br, format, args...) \
475 br_printk(KERN_NOTICE, __br, format, ##args)
476 #define br_info(__br, format, args...) \
477 br_printk(KERN_INFO, __br, format, ##args)
479 #define br_debug(br, format, args...) \
480 pr_debug("%s: " format, (br)->dev->name, ##args)
482 /* called under bridge lock */
483 static inline int br_is_root_bridge(const struct net_bridge *br)
485 return !memcmp(&br->bridge_id, &br->designated_root, 8);
488 /* check if a VLAN entry is global */
489 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
491 return v->flags & BRIDGE_VLAN_INFO_MASTER;
494 /* check if a VLAN entry is used by the bridge */
495 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
497 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
500 /* check if we should use the vlan entry, returns false if it's only context */
501 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
503 if (br_vlan_is_master(v)) {
504 if (br_vlan_is_brentry(v))
513 static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
515 return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
518 static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
520 bool ret = vid > 0 && vid < VLAN_VID_MASK;
523 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
528 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
529 const struct bridge_vlan_info *last,
530 struct netlink_ext_ack *extack)
532 /* pvid flag is not allowed in ranges */
533 if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
534 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
538 /* when cur is the range end, check if:
539 * - it has range start flag
540 * - range ids are invalid (end is equal to or before start)
543 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
544 NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
546 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
547 NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
549 } else if (cur->vid <= last->vid) {
550 NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
555 /* check for required range flags */
556 if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
557 BRIDGE_VLAN_INFO_RANGE_END))) {
558 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
565 static inline int br_afspec_cmd_to_rtm(int cmd)
577 static inline int br_opt_get(const struct net_bridge *br,
578 enum net_bridge_opts opt)
580 return test_bit(opt, &br->options);
583 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
584 struct netlink_ext_ack *extack);
585 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
586 int br_boolopt_multi_toggle(struct net_bridge *br,
587 struct br_boolopt_multi *bm,
588 struct netlink_ext_ack *extack);
589 void br_boolopt_multi_get(const struct net_bridge *br,
590 struct br_boolopt_multi *bm);
591 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
594 void br_dev_setup(struct net_device *dev);
595 void br_dev_delete(struct net_device *dev, struct list_head *list);
596 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
597 #ifdef CONFIG_NET_POLL_CONTROLLER
598 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
601 netpoll_send_skb(p->np, skb);
604 int br_netpoll_enable(struct net_bridge_port *p);
605 void br_netpoll_disable(struct net_bridge_port *p);
607 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
612 static inline int br_netpoll_enable(struct net_bridge_port *p)
617 static inline void br_netpoll_disable(struct net_bridge_port *p)
623 int br_fdb_init(void);
624 void br_fdb_fini(void);
625 int br_fdb_hash_init(struct net_bridge *br);
626 void br_fdb_hash_fini(struct net_bridge *br);
627 void br_fdb_flush(struct net_bridge *br);
628 void br_fdb_find_delete_local(struct net_bridge *br,
629 const struct net_bridge_port *p,
630 const unsigned char *addr, u16 vid);
631 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
632 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
633 void br_fdb_cleanup(struct work_struct *work);
634 void br_fdb_delete_by_port(struct net_bridge *br,
635 const struct net_bridge_port *p, u16 vid, int do_all);
636 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
637 const unsigned char *addr,
639 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
640 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
642 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
643 const unsigned char *addr, u16 vid);
644 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
645 const unsigned char *addr, u16 vid, unsigned long flags);
647 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
648 struct net_device *dev, const unsigned char *addr, u16 vid);
649 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
650 const unsigned char *addr, u16 vid, u16 nlh_flags,
651 struct netlink_ext_ack *extack);
652 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
653 struct net_device *dev, struct net_device *fdev, int *idx);
654 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
655 const unsigned char *addr, u16 vid, u32 portid, u32 seq,
656 struct netlink_ext_ack *extack);
657 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
658 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
659 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
660 const unsigned char *addr, u16 vid,
662 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
663 const unsigned char *addr, u16 vid,
665 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
666 const unsigned char *addr, u16 vid, bool offloaded);
674 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
675 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
676 bool local_rcv, bool local_orig);
677 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
678 void br_flood(struct net_bridge *br, struct sk_buff *skb,
679 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
681 /* return true if both source port and dest port are isolated */
682 static inline bool br_skb_isolated(const struct net_bridge_port *to,
683 const struct sk_buff *skb)
685 return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
686 (to->flags & BR_ISOLATED);
690 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
691 int br_add_bridge(struct net *net, const char *name);
692 int br_del_bridge(struct net *net, const char *name);
693 int br_add_if(struct net_bridge *br, struct net_device *dev,
694 struct netlink_ext_ack *extack);
695 int br_del_if(struct net_bridge *br, struct net_device *dev);
696 void br_mtu_auto_adjust(struct net_bridge *br);
697 netdev_features_t br_features_recompute(struct net_bridge *br,
698 netdev_features_t features);
699 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
700 void br_manage_promisc(struct net_bridge *br);
701 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
704 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
705 rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
707 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
709 return rcu_dereference(dev->rx_handler) == br_get_rx_handler(dev);
712 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
714 return rcu_dereference_rtnl(dev->rx_handler) == br_get_rx_handler(dev);
717 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
719 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
722 static inline struct net_bridge_port *
723 br_port_get_check_rtnl(const struct net_device *dev)
725 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
729 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
730 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
734 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
735 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
736 struct sk_buff *skb, u16 vid);
737 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
738 struct sk_buff *skb, u16 vid);
739 int br_multicast_add_port(struct net_bridge_port *port);
740 void br_multicast_del_port(struct net_bridge_port *port);
741 void br_multicast_enable_port(struct net_bridge_port *port);
742 void br_multicast_disable_port(struct net_bridge_port *port);
743 void br_multicast_init(struct net_bridge *br);
744 void br_multicast_open(struct net_bridge *br);
745 void br_multicast_stop(struct net_bridge *br);
746 void br_multicast_dev_del(struct net_bridge *br);
747 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
748 struct sk_buff *skb, bool local_rcv, bool local_orig);
749 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
750 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
751 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
752 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
753 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
754 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
755 #if IS_ENABLED(CONFIG_IPV6)
756 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
758 struct net_bridge_mdb_entry *
759 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
760 struct net_bridge_mdb_entry *
761 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
762 struct net_bridge_port_group *
763 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
764 struct net_bridge_port_group __rcu *next,
765 unsigned char flags, const unsigned char *src);
766 int br_mdb_hash_init(struct net_bridge *br);
767 void br_mdb_hash_fini(struct net_bridge *br);
768 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
769 struct br_ip *group, int type, u8 flags);
770 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
772 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
773 const struct sk_buff *skb, u8 type, u8 dir);
774 int br_multicast_init_stats(struct net_bridge *br);
775 void br_multicast_uninit_stats(struct net_bridge *br);
776 void br_multicast_get_stats(const struct net_bridge *br,
777 const struct net_bridge_port *p,
778 struct br_mcast_stats *dest);
779 void br_mdb_init(void);
780 void br_mdb_uninit(void);
781 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
782 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
784 #define mlock_dereference(X, br) \
785 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
787 static inline bool br_multicast_is_router(struct net_bridge *br)
789 return br->multicast_router == 2 ||
790 (br->multicast_router == 1 &&
791 timer_pending(&br->multicast_router_timer));
795 __br_multicast_querier_exists(struct net_bridge *br,
796 struct bridge_mcast_other_query *querier,
799 bool own_querier_enabled;
801 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
802 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
803 own_querier_enabled = false;
805 own_querier_enabled = true;
807 own_querier_enabled = false;
810 return time_is_before_jiffies(querier->delay_time) &&
811 (own_querier_enabled || timer_pending(&querier->timer));
814 static inline bool br_multicast_querier_exists(struct net_bridge *br,
817 switch (eth->h_proto) {
818 case (htons(ETH_P_IP)):
819 return __br_multicast_querier_exists(br,
820 &br->ip4_other_query, false);
821 #if IS_ENABLED(CONFIG_IPV6)
822 case (htons(ETH_P_IPV6)):
823 return __br_multicast_querier_exists(br,
824 &br->ip6_other_query, true);
831 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
833 return BR_INPUT_SKB_CB(skb)->igmp;
836 static inline int br_multicast_rcv(struct net_bridge *br,
837 struct net_bridge_port *port,
844 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
845 struct sk_buff *skb, u16 vid)
850 static inline int br_multicast_add_port(struct net_bridge_port *port)
855 static inline void br_multicast_del_port(struct net_bridge_port *port)
859 static inline void br_multicast_enable_port(struct net_bridge_port *port)
863 static inline void br_multicast_disable_port(struct net_bridge_port *port)
867 static inline void br_multicast_init(struct net_bridge *br)
871 static inline void br_multicast_open(struct net_bridge *br)
875 static inline void br_multicast_stop(struct net_bridge *br)
879 static inline void br_multicast_dev_del(struct net_bridge *br)
883 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
885 bool local_rcv, bool local_orig)
889 static inline bool br_multicast_is_router(struct net_bridge *br)
894 static inline bool br_multicast_querier_exists(struct net_bridge *br,
900 static inline void br_mdb_init(void)
904 static inline void br_mdb_uninit(void)
908 static inline int br_mdb_hash_init(struct net_bridge *br)
913 static inline void br_mdb_hash_fini(struct net_bridge *br)
917 static inline void br_multicast_count(struct net_bridge *br,
918 const struct net_bridge_port *p,
919 const struct sk_buff *skb,
924 static inline int br_multicast_init_stats(struct net_bridge *br)
929 static inline void br_multicast_uninit_stats(struct net_bridge *br)
933 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
940 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
941 bool br_allowed_ingress(const struct net_bridge *br,
942 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
943 u16 *vid, u8 *state);
944 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
945 const struct sk_buff *skb);
946 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
947 struct sk_buff *br_handle_vlan(struct net_bridge *br,
948 const struct net_bridge_port *port,
949 struct net_bridge_vlan_group *vg,
950 struct sk_buff *skb);
951 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
952 bool *changed, struct netlink_ext_ack *extack);
953 int br_vlan_delete(struct net_bridge *br, u16 vid);
954 void br_vlan_flush(struct net_bridge *br);
955 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
956 void br_recalculate_fwd_mask(struct net_bridge *br);
957 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
958 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
959 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
960 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
961 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
962 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
963 int br_vlan_init(struct net_bridge *br);
964 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
965 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
966 struct netlink_ext_ack *extack);
967 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
968 bool *changed, struct netlink_ext_ack *extack);
969 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
970 void nbp_vlan_flush(struct net_bridge_port *port);
971 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
972 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
973 void br_vlan_get_stats(const struct net_bridge_vlan *v,
974 struct br_vlan_stats *stats);
975 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
976 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
978 void br_vlan_rtnl_init(void);
979 void br_vlan_rtnl_uninit(void);
980 void br_vlan_notify(const struct net_bridge *br,
981 const struct net_bridge_port *p,
982 u16 vid, u16 vid_range,
984 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
985 const struct net_bridge_vlan *range_end);
987 static inline struct net_bridge_vlan_group *br_vlan_group(
988 const struct net_bridge *br)
990 return rtnl_dereference(br->vlgrp);
993 static inline struct net_bridge_vlan_group *nbp_vlan_group(
994 const struct net_bridge_port *p)
996 return rtnl_dereference(p->vlgrp);
999 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1000 const struct net_bridge *br)
1002 return rcu_dereference(br->vlgrp);
1005 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1006 const struct net_bridge_port *p)
1008 return rcu_dereference(p->vlgrp);
1011 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1012 * skb, the vlan tag will always be present if the frame was tagged.
1014 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1018 if (skb_vlan_tag_present(skb)) {
1019 *vid = skb_vlan_tag_get_id(skb);
1028 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1037 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1039 return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1042 static inline bool br_allowed_ingress(const struct net_bridge *br,
1043 struct net_bridge_vlan_group *vg,
1044 struct sk_buff *skb,
1045 u16 *vid, u8 *state)
1050 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1051 const struct sk_buff *skb)
1056 static inline bool br_should_learn(struct net_bridge_port *p,
1057 struct sk_buff *skb, u16 *vid)
1062 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1063 const struct net_bridge_port *port,
1064 struct net_bridge_vlan_group *vg,
1065 struct sk_buff *skb)
1070 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1071 bool *changed, struct netlink_ext_ack *extack)
1077 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1082 static inline void br_vlan_flush(struct net_bridge *br)
1086 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1090 static inline int br_vlan_init(struct net_bridge *br)
1095 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1096 bool *changed, struct netlink_ext_ack *extack)
1102 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1107 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1111 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1117 static inline int nbp_vlan_init(struct net_bridge_port *port,
1118 struct netlink_ext_ack *extack)
1123 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1128 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1133 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1139 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1145 static inline struct net_bridge_vlan_group *br_vlan_group(
1146 const struct net_bridge *br)
1151 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1152 const struct net_bridge_port *p)
1157 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1158 const struct net_bridge *br)
1163 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1164 const struct net_bridge_port *p)
1169 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1170 struct br_vlan_stats *stats)
1174 static inline void br_vlan_port_event(struct net_bridge_port *p,
1175 unsigned long event)
1179 static inline int br_vlan_bridge_event(struct net_device *dev,
1180 unsigned long event, void *ptr)
1185 static inline void br_vlan_rtnl_init(void)
1189 static inline void br_vlan_rtnl_uninit(void)
1193 static inline void br_vlan_notify(const struct net_bridge *br,
1194 const struct net_bridge_port *p,
1195 u16 vid, u16 vid_range,
1201 /* br_vlan_options.c */
1202 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1203 bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1204 const struct net_bridge_vlan *range_end);
1205 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1206 size_t br_vlan_opts_nl_size(void);
1207 int br_vlan_process_options(const struct net_bridge *br,
1208 const struct net_bridge_port *p,
1209 struct net_bridge_vlan *range_start,
1210 struct net_bridge_vlan *range_end,
1212 struct netlink_ext_ack *extack);
1214 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1215 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1217 return READ_ONCE(v->state);
1220 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1222 WRITE_ONCE(v->state, state);
1225 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1227 return READ_ONCE(vg->pvid_state);
1230 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1233 WRITE_ONCE(vg->pvid_state, state);
1236 /* learn_allow is true at ingress and false at egress */
1237 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1240 case BR_STATE_LEARNING:
1242 case BR_STATE_FORWARDING:
1251 int (*br_dev_xmit_hook)(struct sk_buff *skb);
1253 extern const struct nf_br_ops __rcu *nf_br_ops;
1255 /* br_netfilter.c */
1256 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1257 int br_nf_core_init(void);
1258 void br_nf_core_fini(void);
1259 void br_netfilter_rtable_init(struct net_bridge *);
1261 static inline int br_nf_core_init(void) { return 0; }
1262 static inline void br_nf_core_fini(void) {}
1263 #define br_netfilter_rtable_init(x)
1267 void br_set_state(struct net_bridge_port *p, unsigned int state);
1268 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1269 void br_init_port(struct net_bridge_port *p);
1270 void br_become_designated_port(struct net_bridge_port *p);
1272 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1273 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1274 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1275 int br_set_max_age(struct net_bridge *br, unsigned long x);
1276 int __set_ageing_time(struct net_device *dev, unsigned long t);
1277 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1281 void br_stp_enable_bridge(struct net_bridge *br);
1282 void br_stp_disable_bridge(struct net_bridge *br);
1283 int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1284 struct netlink_ext_ack *extack);
1285 void br_stp_enable_port(struct net_bridge_port *p);
1286 void br_stp_disable_port(struct net_bridge_port *p);
1287 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1288 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1289 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1290 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1291 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1292 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1296 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1297 struct net_device *dev);
1299 /* br_stp_timer.c */
1300 void br_stp_timer_init(struct net_bridge *br);
1301 void br_stp_port_timer_init(struct net_bridge_port *p);
1302 unsigned long br_timer_value(const struct timer_list *timer);
1305 #if IS_ENABLED(CONFIG_ATM_LANE)
1306 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1310 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
1311 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1312 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1313 int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
1314 bool br_mrp_enabled(struct net_bridge *br);
1315 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1317 static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1318 struct nlattr *attr, int cmd,
1319 struct netlink_ext_ack *extack)
1324 static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1329 static inline bool br_mrp_enabled(struct net_bridge *br)
1334 static inline void br_mrp_port_del(struct net_bridge *br,
1335 struct net_bridge_port *p)
1341 extern struct rtnl_link_ops br_link_ops;
1342 int br_netlink_init(void);
1343 void br_netlink_fini(void);
1344 void br_ifinfo_notify(int event, const struct net_bridge *br,
1345 const struct net_bridge_port *port);
1346 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1347 struct netlink_ext_ack *extack);
1348 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1349 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1350 u32 filter_mask, int nlflags);
1351 int br_process_vlan_info(struct net_bridge *br,
1352 struct net_bridge_port *p, int cmd,
1353 struct bridge_vlan_info *vinfo_curr,
1354 struct bridge_vlan_info **vinfo_last,
1356 struct netlink_ext_ack *extack);
1360 extern const struct sysfs_ops brport_sysfs_ops;
1361 int br_sysfs_addif(struct net_bridge_port *p);
1362 int br_sysfs_renameif(struct net_bridge_port *p);
1365 int br_sysfs_addbr(struct net_device *dev);
1366 void br_sysfs_delbr(struct net_device *dev);
1370 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1371 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1372 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1373 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1374 #endif /* CONFIG_SYSFS */
1376 /* br_switchdev.c */
1377 #ifdef CONFIG_NET_SWITCHDEV
1378 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1379 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1380 struct sk_buff *skb);
1381 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1382 const struct sk_buff *skb);
1383 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1384 unsigned long flags,
1385 unsigned long mask);
1386 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1388 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1389 struct netlink_ext_ack *extack);
1390 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1392 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1394 skb->offload_fwd_mark = 0;
1397 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1402 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1403 struct sk_buff *skb)
1407 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1408 const struct sk_buff *skb)
1413 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1414 unsigned long flags,
1420 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1422 struct netlink_ext_ack *extack)
1427 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1433 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1437 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1440 #endif /* CONFIG_NET_SWITCHDEV */
1442 /* br_arp_nd_proxy.c */
1443 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1444 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1445 u16 vid, struct net_bridge_port *p);
1446 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1447 u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1448 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);