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 struct netpoll *np = p->np;
604 netpoll_send_skb(np, skb);
607 int br_netpoll_enable(struct net_bridge_port *p);
608 void br_netpoll_disable(struct net_bridge_port *p);
610 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
615 static inline int br_netpoll_enable(struct net_bridge_port *p)
620 static inline void br_netpoll_disable(struct net_bridge_port *p)
626 int br_fdb_init(void);
627 void br_fdb_fini(void);
628 int br_fdb_hash_init(struct net_bridge *br);
629 void br_fdb_hash_fini(struct net_bridge *br);
630 void br_fdb_flush(struct net_bridge *br);
631 void br_fdb_find_delete_local(struct net_bridge *br,
632 const struct net_bridge_port *p,
633 const unsigned char *addr, u16 vid);
634 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
635 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
636 void br_fdb_cleanup(struct work_struct *work);
637 void br_fdb_delete_by_port(struct net_bridge *br,
638 const struct net_bridge_port *p, u16 vid, int do_all);
639 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
640 const unsigned char *addr,
642 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
643 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
645 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
646 const unsigned char *addr, u16 vid);
647 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
648 const unsigned char *addr, u16 vid, unsigned long flags);
650 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
651 struct net_device *dev, const unsigned char *addr, u16 vid);
652 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
653 const unsigned char *addr, u16 vid, u16 nlh_flags,
654 struct netlink_ext_ack *extack);
655 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
656 struct net_device *dev, struct net_device *fdev, int *idx);
657 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
658 const unsigned char *addr, u16 vid, u32 portid, u32 seq,
659 struct netlink_ext_ack *extack);
660 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
661 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
662 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
663 const unsigned char *addr, u16 vid,
665 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
666 const unsigned char *addr, u16 vid,
668 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
669 const unsigned char *addr, u16 vid, bool offloaded);
677 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
678 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
679 bool local_rcv, bool local_orig);
680 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
681 void br_flood(struct net_bridge *br, struct sk_buff *skb,
682 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
684 /* return true if both source port and dest port are isolated */
685 static inline bool br_skb_isolated(const struct net_bridge_port *to,
686 const struct sk_buff *skb)
688 return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
689 (to->flags & BR_ISOLATED);
693 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
694 int br_add_bridge(struct net *net, const char *name);
695 int br_del_bridge(struct net *net, const char *name);
696 int br_add_if(struct net_bridge *br, struct net_device *dev,
697 struct netlink_ext_ack *extack);
698 int br_del_if(struct net_bridge *br, struct net_device *dev);
699 void br_mtu_auto_adjust(struct net_bridge *br);
700 netdev_features_t br_features_recompute(struct net_bridge *br,
701 netdev_features_t features);
702 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
703 void br_manage_promisc(struct net_bridge *br);
704 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
707 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
708 rx_handler_result_t br_handle_frame(struct sk_buff **pskb);
710 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
712 return rcu_dereference(dev->rx_handler) == br_handle_frame;
715 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
717 return rcu_dereference_rtnl(dev->rx_handler) == br_handle_frame;
720 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
722 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
725 static inline struct net_bridge_port *
726 br_port_get_check_rtnl(const struct net_device *dev)
728 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
732 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
733 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
737 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
738 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
739 struct sk_buff *skb, u16 vid);
740 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
741 struct sk_buff *skb, u16 vid);
742 int br_multicast_add_port(struct net_bridge_port *port);
743 void br_multicast_del_port(struct net_bridge_port *port);
744 void br_multicast_enable_port(struct net_bridge_port *port);
745 void br_multicast_disable_port(struct net_bridge_port *port);
746 void br_multicast_init(struct net_bridge *br);
747 void br_multicast_open(struct net_bridge *br);
748 void br_multicast_stop(struct net_bridge *br);
749 void br_multicast_dev_del(struct net_bridge *br);
750 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
751 struct sk_buff *skb, bool local_rcv, bool local_orig);
752 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
753 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
754 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
755 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
756 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
757 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
758 #if IS_ENABLED(CONFIG_IPV6)
759 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
761 struct net_bridge_mdb_entry *
762 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
763 struct net_bridge_mdb_entry *
764 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
765 struct net_bridge_port_group *
766 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
767 struct net_bridge_port_group __rcu *next,
768 unsigned char flags, const unsigned char *src);
769 int br_mdb_hash_init(struct net_bridge *br);
770 void br_mdb_hash_fini(struct net_bridge *br);
771 void br_mdb_notify(struct net_device *dev, struct net_bridge_port *port,
772 struct br_ip *group, int type, u8 flags);
773 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
775 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
776 const struct sk_buff *skb, u8 type, u8 dir);
777 int br_multicast_init_stats(struct net_bridge *br);
778 void br_multicast_uninit_stats(struct net_bridge *br);
779 void br_multicast_get_stats(const struct net_bridge *br,
780 const struct net_bridge_port *p,
781 struct br_mcast_stats *dest);
782 void br_mdb_init(void);
783 void br_mdb_uninit(void);
784 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
785 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
787 #define mlock_dereference(X, br) \
788 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
790 static inline bool br_multicast_is_router(struct net_bridge *br)
792 return br->multicast_router == 2 ||
793 (br->multicast_router == 1 &&
794 timer_pending(&br->multicast_router_timer));
798 __br_multicast_querier_exists(struct net_bridge *br,
799 struct bridge_mcast_other_query *querier,
802 bool own_querier_enabled;
804 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
805 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
806 own_querier_enabled = false;
808 own_querier_enabled = true;
810 own_querier_enabled = false;
813 return time_is_before_jiffies(querier->delay_time) &&
814 (own_querier_enabled || timer_pending(&querier->timer));
817 static inline bool br_multicast_querier_exists(struct net_bridge *br,
820 switch (eth->h_proto) {
821 case (htons(ETH_P_IP)):
822 return __br_multicast_querier_exists(br,
823 &br->ip4_other_query, false);
824 #if IS_ENABLED(CONFIG_IPV6)
825 case (htons(ETH_P_IPV6)):
826 return __br_multicast_querier_exists(br,
827 &br->ip6_other_query, true);
834 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
836 return BR_INPUT_SKB_CB(skb)->igmp;
839 static inline int br_multicast_rcv(struct net_bridge *br,
840 struct net_bridge_port *port,
847 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
848 struct sk_buff *skb, u16 vid)
853 static inline int br_multicast_add_port(struct net_bridge_port *port)
858 static inline void br_multicast_del_port(struct net_bridge_port *port)
862 static inline void br_multicast_enable_port(struct net_bridge_port *port)
866 static inline void br_multicast_disable_port(struct net_bridge_port *port)
870 static inline void br_multicast_init(struct net_bridge *br)
874 static inline void br_multicast_open(struct net_bridge *br)
878 static inline void br_multicast_stop(struct net_bridge *br)
882 static inline void br_multicast_dev_del(struct net_bridge *br)
886 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
888 bool local_rcv, bool local_orig)
892 static inline bool br_multicast_is_router(struct net_bridge *br)
897 static inline bool br_multicast_querier_exists(struct net_bridge *br,
903 static inline void br_mdb_init(void)
907 static inline void br_mdb_uninit(void)
911 static inline int br_mdb_hash_init(struct net_bridge *br)
916 static inline void br_mdb_hash_fini(struct net_bridge *br)
920 static inline void br_multicast_count(struct net_bridge *br,
921 const struct net_bridge_port *p,
922 const struct sk_buff *skb,
927 static inline int br_multicast_init_stats(struct net_bridge *br)
932 static inline void br_multicast_uninit_stats(struct net_bridge *br)
936 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
943 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
944 bool br_allowed_ingress(const struct net_bridge *br,
945 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
946 u16 *vid, u8 *state);
947 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
948 const struct sk_buff *skb);
949 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
950 struct sk_buff *br_handle_vlan(struct net_bridge *br,
951 const struct net_bridge_port *port,
952 struct net_bridge_vlan_group *vg,
953 struct sk_buff *skb);
954 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
955 bool *changed, struct netlink_ext_ack *extack);
956 int br_vlan_delete(struct net_bridge *br, u16 vid);
957 void br_vlan_flush(struct net_bridge *br);
958 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
959 void br_recalculate_fwd_mask(struct net_bridge *br);
960 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
961 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
962 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
963 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
964 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
965 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
966 int br_vlan_init(struct net_bridge *br);
967 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
968 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
969 struct netlink_ext_ack *extack);
970 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
971 bool *changed, struct netlink_ext_ack *extack);
972 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
973 void nbp_vlan_flush(struct net_bridge_port *port);
974 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
975 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
976 void br_vlan_get_stats(const struct net_bridge_vlan *v,
977 struct br_vlan_stats *stats);
978 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
979 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
981 void br_vlan_rtnl_init(void);
982 void br_vlan_rtnl_uninit(void);
983 void br_vlan_notify(const struct net_bridge *br,
984 const struct net_bridge_port *p,
985 u16 vid, u16 vid_range,
987 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
988 const struct net_bridge_vlan *range_end);
990 static inline struct net_bridge_vlan_group *br_vlan_group(
991 const struct net_bridge *br)
993 return rtnl_dereference(br->vlgrp);
996 static inline struct net_bridge_vlan_group *nbp_vlan_group(
997 const struct net_bridge_port *p)
999 return rtnl_dereference(p->vlgrp);
1002 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1003 const struct net_bridge *br)
1005 return rcu_dereference(br->vlgrp);
1008 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1009 const struct net_bridge_port *p)
1011 return rcu_dereference(p->vlgrp);
1014 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1015 * skb, the vlan tag will always be present if the frame was tagged.
1017 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1021 if (skb_vlan_tag_present(skb)) {
1022 *vid = skb_vlan_tag_get_id(skb);
1031 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1040 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1042 return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1045 static inline bool br_allowed_ingress(const struct net_bridge *br,
1046 struct net_bridge_vlan_group *vg,
1047 struct sk_buff *skb,
1048 u16 *vid, u8 *state)
1053 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1054 const struct sk_buff *skb)
1059 static inline bool br_should_learn(struct net_bridge_port *p,
1060 struct sk_buff *skb, u16 *vid)
1065 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1066 const struct net_bridge_port *port,
1067 struct net_bridge_vlan_group *vg,
1068 struct sk_buff *skb)
1073 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1074 bool *changed, struct netlink_ext_ack *extack)
1080 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1085 static inline void br_vlan_flush(struct net_bridge *br)
1089 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1093 static inline int br_vlan_init(struct net_bridge *br)
1098 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1099 bool *changed, struct netlink_ext_ack *extack)
1105 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1110 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1114 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1120 static inline int nbp_vlan_init(struct net_bridge_port *port,
1121 struct netlink_ext_ack *extack)
1126 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1131 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1136 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1142 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1148 static inline struct net_bridge_vlan_group *br_vlan_group(
1149 const struct net_bridge *br)
1154 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1155 const struct net_bridge_port *p)
1160 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1161 const struct net_bridge *br)
1166 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1167 const struct net_bridge_port *p)
1172 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1173 struct br_vlan_stats *stats)
1177 static inline void br_vlan_port_event(struct net_bridge_port *p,
1178 unsigned long event)
1182 static inline int br_vlan_bridge_event(struct net_device *dev,
1183 unsigned long event, void *ptr)
1188 static inline void br_vlan_rtnl_init(void)
1192 static inline void br_vlan_rtnl_uninit(void)
1196 static inline void br_vlan_notify(const struct net_bridge *br,
1197 const struct net_bridge_port *p,
1198 u16 vid, u16 vid_range,
1204 /* br_vlan_options.c */
1205 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1206 bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1207 const struct net_bridge_vlan *range_end);
1208 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1209 size_t br_vlan_opts_nl_size(void);
1210 int br_vlan_process_options(const struct net_bridge *br,
1211 const struct net_bridge_port *p,
1212 struct net_bridge_vlan *range_start,
1213 struct net_bridge_vlan *range_end,
1215 struct netlink_ext_ack *extack);
1217 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1218 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1220 return READ_ONCE(v->state);
1223 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1225 WRITE_ONCE(v->state, state);
1228 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1230 return READ_ONCE(vg->pvid_state);
1233 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1236 WRITE_ONCE(vg->pvid_state, state);
1239 /* learn_allow is true at ingress and false at egress */
1240 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1243 case BR_STATE_LEARNING:
1245 case BR_STATE_FORWARDING:
1254 int (*br_dev_xmit_hook)(struct sk_buff *skb);
1256 extern const struct nf_br_ops __rcu *nf_br_ops;
1258 /* br_netfilter.c */
1259 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1260 int br_nf_core_init(void);
1261 void br_nf_core_fini(void);
1262 void br_netfilter_rtable_init(struct net_bridge *);
1264 static inline int br_nf_core_init(void) { return 0; }
1265 static inline void br_nf_core_fini(void) {}
1266 #define br_netfilter_rtable_init(x)
1270 void br_set_state(struct net_bridge_port *p, unsigned int state);
1271 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1272 void br_init_port(struct net_bridge_port *p);
1273 void br_become_designated_port(struct net_bridge_port *p);
1275 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1276 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1277 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1278 int br_set_max_age(struct net_bridge *br, unsigned long x);
1279 int __set_ageing_time(struct net_device *dev, unsigned long t);
1280 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1284 void br_stp_enable_bridge(struct net_bridge *br);
1285 void br_stp_disable_bridge(struct net_bridge *br);
1286 int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1287 struct netlink_ext_ack *extack);
1288 void br_stp_enable_port(struct net_bridge_port *p);
1289 void br_stp_disable_port(struct net_bridge_port *p);
1290 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1291 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1292 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1293 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1294 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1295 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1299 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1300 struct net_device *dev);
1302 /* br_stp_timer.c */
1303 void br_stp_timer_init(struct net_bridge *br);
1304 void br_stp_port_timer_init(struct net_bridge_port *p);
1305 unsigned long br_timer_value(const struct timer_list *timer);
1308 #if IS_ENABLED(CONFIG_ATM_LANE)
1309 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1313 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
1314 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1315 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1316 int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
1317 bool br_mrp_enabled(struct net_bridge *br);
1318 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1320 static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1321 struct nlattr *attr, int cmd,
1322 struct netlink_ext_ack *extack)
1327 static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1332 static inline bool br_mrp_enabled(struct net_bridge *br)
1337 static inline void br_mrp_port_del(struct net_bridge *br,
1338 struct net_bridge_port *p)
1344 extern struct rtnl_link_ops br_link_ops;
1345 int br_netlink_init(void);
1346 void br_netlink_fini(void);
1347 void br_ifinfo_notify(int event, const struct net_bridge *br,
1348 const struct net_bridge_port *port);
1349 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1350 struct netlink_ext_ack *extack);
1351 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1352 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1353 u32 filter_mask, int nlflags);
1354 int br_process_vlan_info(struct net_bridge *br,
1355 struct net_bridge_port *p, int cmd,
1356 struct bridge_vlan_info *vinfo_curr,
1357 struct bridge_vlan_info **vinfo_last,
1359 struct netlink_ext_ack *extack);
1363 extern const struct sysfs_ops brport_sysfs_ops;
1364 int br_sysfs_addif(struct net_bridge_port *p);
1365 int br_sysfs_renameif(struct net_bridge_port *p);
1368 int br_sysfs_addbr(struct net_device *dev);
1369 void br_sysfs_delbr(struct net_device *dev);
1373 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1374 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1375 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1376 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1377 #endif /* CONFIG_SYSFS */
1379 /* br_switchdev.c */
1380 #ifdef CONFIG_NET_SWITCHDEV
1381 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1382 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1383 struct sk_buff *skb);
1384 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1385 const struct sk_buff *skb);
1386 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1387 unsigned long flags,
1388 unsigned long mask);
1389 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1391 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1392 struct netlink_ext_ack *extack);
1393 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1395 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1397 skb->offload_fwd_mark = 0;
1400 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1405 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1406 struct sk_buff *skb)
1410 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1411 const struct sk_buff *skb)
1416 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1417 unsigned long flags,
1423 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1425 struct netlink_ext_ack *extack)
1430 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1436 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1440 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1443 #endif /* CONFIG_NET_SWITCHDEV */
1445 /* br_arp_nd_proxy.c */
1446 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1447 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1448 u16 vid, struct net_bridge_port *p);
1449 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1450 u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1451 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);