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 #define BR_FDB_NOTIFY_SETTABLE_BITS (FDB_NOTIFY_BIT | FDB_NOTIFY_INACTIVE_BIT)
53 typedef struct bridge_id bridge_id;
54 typedef struct mac_addr mac_addr;
55 typedef __u16 port_id;
58 unsigned char prio[2];
59 unsigned char addr[ETH_ALEN];
63 unsigned char addr[ETH_ALEN];
66 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
68 struct bridge_mcast_own_query {
69 struct timer_list timer;
74 struct bridge_mcast_other_query {
75 struct timer_list timer;
76 unsigned long delay_time;
79 /* selected querier */
80 struct bridge_mcast_querier {
82 struct net_bridge_port __rcu *port;
85 /* IGMP/MLD statistics */
86 struct bridge_mcast_stats {
87 struct br_mcast_stats mstats;
88 struct u64_stats_sync syncp;
92 struct br_vlan_stats {
97 struct u64_stats_sync syncp;
100 struct br_tunnel_info {
102 struct metadata_dst *tunnel_dst;
105 /* private vlan flags */
107 BR_VLFLAG_PER_PORT_STATS = BIT(0),
108 BR_VLFLAG_ADDED_BY_SWITCHDEV = BIT(1),
112 * struct net_bridge_vlan - per-vlan entry
114 * @vnode: rhashtable member
116 * @flags: bridge vlan flags
117 * @priv_flags: private (in-kernel) bridge vlan flags
118 * @state: STP state (e.g. blocking, learning, forwarding)
119 * @stats: per-cpu VLAN statistics
120 * @br: if MASTER flag set, this points to a bridge struct
121 * @port: if MASTER flag unset, this points to a port struct
122 * @refcnt: if MASTER flag set, this is bumped for each port referencing it
123 * @brvlan: if MASTER flag unset, this points to the global per-VLAN context
124 * for this VLAN entry
125 * @vlist: sorted list of VLAN entries
126 * @rcu: used for entry destruction
128 * This structure is shared between the global per-VLAN entries contained in
129 * the bridge rhashtable and the local per-port per-VLAN entries contained in
130 * the port's rhashtable. The union entries should be interpreted depending on
131 * the entry flags that are set.
133 struct net_bridge_vlan {
134 struct rhash_head vnode;
135 struct rhash_head tnode;
140 struct br_vlan_stats __percpu *stats;
142 struct net_bridge *br;
143 struct net_bridge_port *port;
147 struct net_bridge_vlan *brvlan;
150 struct br_tunnel_info tinfo;
152 struct list_head vlist;
158 * struct net_bridge_vlan_group
160 * @vlan_hash: VLAN entry rhashtable
161 * @vlan_list: sorted VLAN entry list
162 * @num_vlans: number of total VLAN entries
163 * @pvid: PVID VLAN id
164 * @pvid_state: PVID's STP state (e.g. forwarding, learning, blocking)
166 * IMPORTANT: Be careful when checking if there're VLAN entries using list
167 * primitives because the bridge can have entries in its list which
168 * are just for global context but not for filtering, i.e. they have
169 * the master flag set but not the brentry flag. If you have to check
170 * if there're "real" entries in the bridge please test @num_vlans
172 struct net_bridge_vlan_group {
173 struct rhashtable vlan_hash;
174 struct rhashtable tunnel_hash;
175 struct list_head vlan_list;
181 /* bridge fdb flags */
186 BR_FDB_ADDED_BY_USER,
187 BR_FDB_ADDED_BY_EXT_LEARN,
190 BR_FDB_NOTIFY_INACTIVE
193 struct net_bridge_fdb_key {
198 struct net_bridge_fdb_entry {
199 struct rhash_head rhnode;
200 struct net_bridge_port *dst;
202 struct net_bridge_fdb_key key;
203 struct hlist_node fdb_node;
206 /* write-heavy members should not affect lookups */
207 unsigned long updated ____cacheline_aligned_in_smp;
213 #define MDB_PG_FLAGS_PERMANENT BIT(0)
214 #define MDB_PG_FLAGS_OFFLOAD BIT(1)
215 #define MDB_PG_FLAGS_FAST_LEAVE BIT(2)
216 #define MDB_PG_FLAGS_STAR_EXCL BIT(3)
217 #define MDB_PG_FLAGS_BLOCKED BIT(4)
219 #define PG_SRC_ENT_LIMIT 32
221 #define BR_SGRP_F_DELETE BIT(0)
222 #define BR_SGRP_F_SEND BIT(1)
223 #define BR_SGRP_F_INSTALLED BIT(2)
225 struct net_bridge_mcast_gc {
226 struct hlist_node gc_node;
227 void (*destroy)(struct net_bridge_mcast_gc *gc);
230 struct net_bridge_group_src {
231 struct hlist_node node;
234 struct net_bridge_port_group *pg;
236 u8 src_query_rexmit_cnt;
237 struct timer_list timer;
239 struct net_bridge *br;
240 struct net_bridge_mcast_gc mcast_gc;
244 struct net_bridge_port_group_sg_key {
245 struct net_bridge_port *port;
249 struct net_bridge_port_group {
250 struct net_bridge_port_group __rcu *next;
251 struct net_bridge_port_group_sg_key key;
252 unsigned char eth_addr[ETH_ALEN] __aligned(2);
254 unsigned char filter_mode;
255 unsigned char grp_query_rexmit_cnt;
256 unsigned char rt_protocol;
258 struct hlist_head src_list;
259 unsigned int src_ents;
260 struct timer_list timer;
261 struct timer_list rexmit_timer;
262 struct hlist_node mglist;
264 struct rhash_head rhnode;
265 struct net_bridge_mcast_gc mcast_gc;
269 struct net_bridge_mdb_entry {
270 struct rhash_head rhnode;
271 struct net_bridge *br;
272 struct net_bridge_port_group __rcu *ports;
276 struct timer_list timer;
277 struct hlist_node mdb_node;
279 struct net_bridge_mcast_gc mcast_gc;
283 struct net_bridge_port {
284 struct net_bridge *br;
285 struct net_device *dev;
286 struct list_head list;
289 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
290 struct net_bridge_vlan_group __rcu *vlgrp;
292 struct net_bridge_port __rcu *backup_port;
298 unsigned char topology_change_ack;
299 unsigned char config_pending;
301 port_id designated_port;
302 bridge_id designated_root;
303 bridge_id designated_bridge;
306 unsigned long designated_age;
308 struct timer_list forward_delay_timer;
309 struct timer_list hold_timer;
310 struct timer_list message_age_timer;
314 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
315 struct bridge_mcast_own_query ip4_own_query;
316 #if IS_ENABLED(CONFIG_IPV6)
317 struct bridge_mcast_own_query ip6_own_query;
318 #endif /* IS_ENABLED(CONFIG_IPV6) */
319 unsigned char multicast_router;
320 struct bridge_mcast_stats __percpu *mcast_stats;
321 struct timer_list multicast_router_timer;
322 struct hlist_head mglist;
323 struct hlist_node rlist;
327 char sysfs_name[IFNAMSIZ];
330 #ifdef CONFIG_NET_POLL_CONTROLLER
333 #ifdef CONFIG_NET_SWITCHDEV
334 int offload_fwd_mark;
337 u16 backup_redirected_cnt;
339 struct bridge_stp_xstats stp_xstats;
342 #define kobj_to_brport(obj) container_of(obj, struct net_bridge_port, kobj)
344 #define br_auto_port(p) ((p)->flags & BR_AUTO_MASK)
345 #define br_promisc_port(p) ((p)->flags & BR_PROMISC)
347 static inline struct net_bridge_port *br_port_get_rcu(const struct net_device *dev)
349 return rcu_dereference(dev->rx_handler_data);
352 static inline struct net_bridge_port *br_port_get_rtnl(const struct net_device *dev)
354 return netif_is_bridge_port(dev) ?
355 rtnl_dereference(dev->rx_handler_data) : NULL;
358 static inline struct net_bridge_port *br_port_get_rtnl_rcu(const struct net_device *dev)
360 return netif_is_bridge_port(dev) ?
361 rcu_dereference_rtnl(dev->rx_handler_data) : NULL;
364 enum net_bridge_opts {
366 BROPT_VLAN_STATS_ENABLED,
367 BROPT_NF_CALL_IPTABLES,
368 BROPT_NF_CALL_IP6TABLES,
369 BROPT_NF_CALL_ARPTABLES,
370 BROPT_GROUP_ADDR_SET,
371 BROPT_MULTICAST_ENABLED,
372 BROPT_MULTICAST_QUERIER,
373 BROPT_MULTICAST_QUERY_USE_IFADDR,
374 BROPT_MULTICAST_STATS_ENABLED,
376 BROPT_NEIGH_SUPPRESS_ENABLED,
377 BROPT_MTU_SET_BY_USER,
378 BROPT_VLAN_STATS_PER_PORT,
380 BROPT_VLAN_BRIDGE_BINDING,
385 spinlock_t hash_lock;
386 struct list_head port_list;
387 struct net_device *dev;
388 struct pcpu_sw_netstats __percpu *stats;
389 unsigned long options;
390 /* These fields are accessed on each packet */
391 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
394 struct net_bridge_vlan_group __rcu *vlgrp;
397 struct rhashtable fdb_hash_tbl;
398 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
400 struct rtable fake_rtable;
401 struct rt6_info fake_rt6_info;
405 u16 group_fwd_mask_required;
408 bridge_id designated_root;
410 unsigned char topology_change;
411 unsigned char topology_change_detected;
413 unsigned long max_age;
414 unsigned long hello_time;
415 unsigned long forward_delay;
416 unsigned long ageing_time;
417 unsigned long bridge_max_age;
418 unsigned long bridge_hello_time;
419 unsigned long bridge_forward_delay;
420 unsigned long bridge_ageing_time;
423 u8 group_addr[ETH_ALEN];
426 BR_NO_STP, /* no spanning tree */
427 BR_KERNEL_STP, /* old STP in kernel */
428 BR_USER_STP, /* new RSTP in userspace */
431 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
435 u32 multicast_last_member_count;
436 u32 multicast_startup_query_count;
438 u8 multicast_igmp_version;
440 #if IS_ENABLED(CONFIG_IPV6)
441 u8 multicast_mld_version;
443 spinlock_t multicast_lock;
444 unsigned long multicast_last_member_interval;
445 unsigned long multicast_membership_interval;
446 unsigned long multicast_querier_interval;
447 unsigned long multicast_query_interval;
448 unsigned long multicast_query_response_interval;
449 unsigned long multicast_startup_query_interval;
451 struct rhashtable mdb_hash_tbl;
452 struct rhashtable sg_port_tbl;
454 struct hlist_head mcast_gc_list;
455 struct hlist_head mdb_list;
456 struct hlist_head router_list;
458 struct timer_list multicast_router_timer;
459 struct bridge_mcast_other_query ip4_other_query;
460 struct bridge_mcast_own_query ip4_own_query;
461 struct bridge_mcast_querier ip4_querier;
462 struct bridge_mcast_stats __percpu *mcast_stats;
463 #if IS_ENABLED(CONFIG_IPV6)
464 struct bridge_mcast_other_query ip6_other_query;
465 struct bridge_mcast_own_query ip6_own_query;
466 struct bridge_mcast_querier ip6_querier;
467 #endif /* IS_ENABLED(CONFIG_IPV6) */
468 struct work_struct mcast_gc_work;
471 struct timer_list hello_timer;
472 struct timer_list tcn_timer;
473 struct timer_list topology_change_timer;
474 struct delayed_work gc_work;
475 struct kobject *ifobj;
478 #ifdef CONFIG_NET_SWITCHDEV
479 int offload_fwd_mark;
481 struct hlist_head fdb_list;
483 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
484 struct list_head mrp_list;
488 struct br_input_skb_cb {
489 struct net_device *brdev;
492 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
496 u8 proxyarp_replied:1;
497 u8 src_port_isolated:1;
498 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
501 #ifdef CONFIG_NETFILTER_FAMILY_BRIDGE
502 u8 br_netfilter_broute:1;
505 #ifdef CONFIG_NET_SWITCHDEV
506 int offload_fwd_mark;
510 #define BR_INPUT_SKB_CB(__skb) ((struct br_input_skb_cb *)(__skb)->cb)
512 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
513 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (BR_INPUT_SKB_CB(__skb)->mrouters_only)
515 # define BR_INPUT_SKB_CB_MROUTERS_ONLY(__skb) (0)
518 #define br_printk(level, br, format, args...) \
519 printk(level "%s: " format, (br)->dev->name, ##args)
521 #define br_err(__br, format, args...) \
522 br_printk(KERN_ERR, __br, format, ##args)
523 #define br_warn(__br, format, args...) \
524 br_printk(KERN_WARNING, __br, format, ##args)
525 #define br_notice(__br, format, args...) \
526 br_printk(KERN_NOTICE, __br, format, ##args)
527 #define br_info(__br, format, args...) \
528 br_printk(KERN_INFO, __br, format, ##args)
530 #define br_debug(br, format, args...) \
531 pr_debug("%s: " format, (br)->dev->name, ##args)
533 /* called under bridge lock */
534 static inline int br_is_root_bridge(const struct net_bridge *br)
536 return !memcmp(&br->bridge_id, &br->designated_root, 8);
539 /* check if a VLAN entry is global */
540 static inline bool br_vlan_is_master(const struct net_bridge_vlan *v)
542 return v->flags & BRIDGE_VLAN_INFO_MASTER;
545 /* check if a VLAN entry is used by the bridge */
546 static inline bool br_vlan_is_brentry(const struct net_bridge_vlan *v)
548 return v->flags & BRIDGE_VLAN_INFO_BRENTRY;
551 /* check if we should use the vlan entry, returns false if it's only context */
552 static inline bool br_vlan_should_use(const struct net_bridge_vlan *v)
554 if (br_vlan_is_master(v)) {
555 if (br_vlan_is_brentry(v))
564 static inline bool nbp_state_should_learn(const struct net_bridge_port *p)
566 return p->state == BR_STATE_LEARNING || p->state == BR_STATE_FORWARDING;
569 static inline bool br_vlan_valid_id(u16 vid, struct netlink_ext_ack *extack)
571 bool ret = vid > 0 && vid < VLAN_VID_MASK;
574 NL_SET_ERR_MSG_MOD(extack, "Vlan id is invalid");
579 static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur,
580 const struct bridge_vlan_info *last,
581 struct netlink_ext_ack *extack)
583 /* pvid flag is not allowed in ranges */
584 if (cur->flags & BRIDGE_VLAN_INFO_PVID) {
585 NL_SET_ERR_MSG_MOD(extack, "Pvid isn't allowed in a range");
589 /* when cur is the range end, check if:
590 * - it has range start flag
591 * - range ids are invalid (end is equal to or before start)
594 if (cur->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
595 NL_SET_ERR_MSG_MOD(extack, "Found a new vlan range start while processing one");
597 } else if (!(cur->flags & BRIDGE_VLAN_INFO_RANGE_END)) {
598 NL_SET_ERR_MSG_MOD(extack, "Vlan range end flag is missing");
600 } else if (cur->vid <= last->vid) {
601 NL_SET_ERR_MSG_MOD(extack, "End vlan id is less than or equal to start vlan id");
606 /* check for required range flags */
607 if (!(cur->flags & (BRIDGE_VLAN_INFO_RANGE_BEGIN |
608 BRIDGE_VLAN_INFO_RANGE_END))) {
609 NL_SET_ERR_MSG_MOD(extack, "Both vlan range flags are missing");
616 static inline int br_afspec_cmd_to_rtm(int cmd)
628 static inline int br_opt_get(const struct net_bridge *br,
629 enum net_bridge_opts opt)
631 return test_bit(opt, &br->options);
634 int br_boolopt_toggle(struct net_bridge *br, enum br_boolopt_id opt, bool on,
635 struct netlink_ext_ack *extack);
636 int br_boolopt_get(const struct net_bridge *br, enum br_boolopt_id opt);
637 int br_boolopt_multi_toggle(struct net_bridge *br,
638 struct br_boolopt_multi *bm,
639 struct netlink_ext_ack *extack);
640 void br_boolopt_multi_get(const struct net_bridge *br,
641 struct br_boolopt_multi *bm);
642 void br_opt_toggle(struct net_bridge *br, enum net_bridge_opts opt, bool on);
645 void br_dev_setup(struct net_device *dev);
646 void br_dev_delete(struct net_device *dev, struct list_head *list);
647 netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
648 #ifdef CONFIG_NET_POLL_CONTROLLER
649 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
652 netpoll_send_skb(p->np, skb);
655 int br_netpoll_enable(struct net_bridge_port *p);
656 void br_netpoll_disable(struct net_bridge_port *p);
658 static inline void br_netpoll_send_skb(const struct net_bridge_port *p,
663 static inline int br_netpoll_enable(struct net_bridge_port *p)
668 static inline void br_netpoll_disable(struct net_bridge_port *p)
674 int br_fdb_init(void);
675 void br_fdb_fini(void);
676 int br_fdb_hash_init(struct net_bridge *br);
677 void br_fdb_hash_fini(struct net_bridge *br);
678 void br_fdb_flush(struct net_bridge *br);
679 void br_fdb_find_delete_local(struct net_bridge *br,
680 const struct net_bridge_port *p,
681 const unsigned char *addr, u16 vid);
682 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr);
683 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr);
684 void br_fdb_cleanup(struct work_struct *work);
685 void br_fdb_delete_by_port(struct net_bridge *br,
686 const struct net_bridge_port *p, u16 vid, int do_all);
687 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
688 const unsigned char *addr,
690 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
691 int br_fdb_fillbuf(struct net_bridge *br, void *buf, unsigned long count,
693 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
694 const unsigned char *addr, u16 vid);
695 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
696 const unsigned char *addr, u16 vid, unsigned long flags);
698 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
699 struct net_device *dev, const unsigned char *addr, u16 vid);
700 int br_fdb_add(struct ndmsg *nlh, struct nlattr *tb[], struct net_device *dev,
701 const unsigned char *addr, u16 vid, u16 nlh_flags,
702 struct netlink_ext_ack *extack);
703 int br_fdb_dump(struct sk_buff *skb, struct netlink_callback *cb,
704 struct net_device *dev, struct net_device *fdev, int *idx);
705 int br_fdb_get(struct sk_buff *skb, struct nlattr *tb[], struct net_device *dev,
706 const unsigned char *addr, u16 vid, u32 portid, u32 seq,
707 struct netlink_ext_ack *extack);
708 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p);
709 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p);
710 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
711 const unsigned char *addr, u16 vid,
713 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
714 const unsigned char *addr, u16 vid,
716 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
717 const unsigned char *addr, u16 vid, bool offloaded);
725 int br_dev_queue_push_xmit(struct net *net, struct sock *sk, struct sk_buff *skb);
726 void br_forward(const struct net_bridge_port *to, struct sk_buff *skb,
727 bool local_rcv, bool local_orig);
728 int br_forward_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
729 void br_flood(struct net_bridge *br, struct sk_buff *skb,
730 enum br_pkt_type pkt_type, bool local_rcv, bool local_orig);
732 /* return true if both source port and dest port are isolated */
733 static inline bool br_skb_isolated(const struct net_bridge_port *to,
734 const struct sk_buff *skb)
736 return BR_INPUT_SKB_CB(skb)->src_port_isolated &&
737 (to->flags & BR_ISOLATED);
741 void br_port_carrier_check(struct net_bridge_port *p, bool *notified);
742 int br_add_bridge(struct net *net, const char *name);
743 int br_del_bridge(struct net *net, const char *name);
744 int br_add_if(struct net_bridge *br, struct net_device *dev,
745 struct netlink_ext_ack *extack);
746 int br_del_if(struct net_bridge *br, struct net_device *dev);
747 void br_mtu_auto_adjust(struct net_bridge *br);
748 netdev_features_t br_features_recompute(struct net_bridge *br,
749 netdev_features_t features);
750 void br_port_flags_change(struct net_bridge_port *port, unsigned long mask);
751 void br_manage_promisc(struct net_bridge *br);
752 int nbp_backup_change(struct net_bridge_port *p, struct net_device *backup_dev);
755 int br_handle_frame_finish(struct net *net, struct sock *sk, struct sk_buff *skb);
756 rx_handler_func_t *br_get_rx_handler(const struct net_device *dev);
758 static inline bool br_rx_handler_check_rcu(const struct net_device *dev)
760 return rcu_dereference(dev->rx_handler) == br_get_rx_handler(dev);
763 static inline bool br_rx_handler_check_rtnl(const struct net_device *dev)
765 return rcu_dereference_rtnl(dev->rx_handler) == br_get_rx_handler(dev);
768 static inline struct net_bridge_port *br_port_get_check_rcu(const struct net_device *dev)
770 return br_rx_handler_check_rcu(dev) ? br_port_get_rcu(dev) : NULL;
773 static inline struct net_bridge_port *
774 br_port_get_check_rtnl(const struct net_device *dev)
776 return br_rx_handler_check_rtnl(dev) ? br_port_get_rtnl_rcu(dev) : NULL;
780 int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
781 int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd,
785 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
786 int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
787 struct sk_buff *skb, u16 vid);
788 struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
789 struct sk_buff *skb, u16 vid);
790 int br_multicast_add_port(struct net_bridge_port *port);
791 void br_multicast_del_port(struct net_bridge_port *port);
792 void br_multicast_enable_port(struct net_bridge_port *port);
793 void br_multicast_disable_port(struct net_bridge_port *port);
794 void br_multicast_init(struct net_bridge *br);
795 void br_multicast_open(struct net_bridge *br);
796 void br_multicast_stop(struct net_bridge *br);
797 void br_multicast_dev_del(struct net_bridge *br);
798 void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
799 struct sk_buff *skb, bool local_rcv, bool local_orig);
800 int br_multicast_set_router(struct net_bridge *br, unsigned long val);
801 int br_multicast_set_port_router(struct net_bridge_port *p, unsigned long val);
802 int br_multicast_toggle(struct net_bridge *br, unsigned long val);
803 int br_multicast_set_querier(struct net_bridge *br, unsigned long val);
804 int br_multicast_set_hash_max(struct net_bridge *br, unsigned long val);
805 int br_multicast_set_igmp_version(struct net_bridge *br, unsigned long val);
806 #if IS_ENABLED(CONFIG_IPV6)
807 int br_multicast_set_mld_version(struct net_bridge *br, unsigned long val);
809 struct net_bridge_mdb_entry *
810 br_mdb_ip_get(struct net_bridge *br, struct br_ip *dst);
811 struct net_bridge_mdb_entry *
812 br_multicast_new_group(struct net_bridge *br, struct br_ip *group);
813 struct net_bridge_port_group *
814 br_multicast_new_port_group(struct net_bridge_port *port, struct br_ip *group,
815 struct net_bridge_port_group __rcu *next,
816 unsigned char flags, const unsigned char *src,
817 u8 filter_mode, u8 rt_protocol);
818 int br_mdb_hash_init(struct net_bridge *br);
819 void br_mdb_hash_fini(struct net_bridge *br);
820 void br_mdb_notify(struct net_device *dev, struct net_bridge_mdb_entry *mp,
821 struct net_bridge_port_group *pg, int type);
822 void br_rtr_notify(struct net_device *dev, struct net_bridge_port *port,
824 void br_multicast_del_pg(struct net_bridge_mdb_entry *mp,
825 struct net_bridge_port_group *pg,
826 struct net_bridge_port_group __rcu **pp);
827 void br_multicast_count(struct net_bridge *br, const struct net_bridge_port *p,
828 const struct sk_buff *skb, u8 type, u8 dir);
829 int br_multicast_init_stats(struct net_bridge *br);
830 void br_multicast_uninit_stats(struct net_bridge *br);
831 void br_multicast_get_stats(const struct net_bridge *br,
832 const struct net_bridge_port *p,
833 struct br_mcast_stats *dest);
834 void br_mdb_init(void);
835 void br_mdb_uninit(void);
836 void br_multicast_host_join(struct net_bridge_mdb_entry *mp, bool notify);
837 void br_multicast_host_leave(struct net_bridge_mdb_entry *mp, bool notify);
838 void br_multicast_star_g_handle_mode(struct net_bridge_port_group *pg,
840 void br_multicast_sg_add_exclude_ports(struct net_bridge_mdb_entry *star_mp,
841 struct net_bridge_port_group *sg);
843 #define mlock_dereference(X, br) \
844 rcu_dereference_protected(X, lockdep_is_held(&br->multicast_lock))
846 static inline bool br_multicast_is_router(struct net_bridge *br)
848 return br->multicast_router == 2 ||
849 (br->multicast_router == 1 &&
850 timer_pending(&br->multicast_router_timer));
854 __br_multicast_querier_exists(struct net_bridge *br,
855 struct bridge_mcast_other_query *querier,
858 bool own_querier_enabled;
860 if (br_opt_get(br, BROPT_MULTICAST_QUERIER)) {
861 if (is_ipv6 && !br_opt_get(br, BROPT_HAS_IPV6_ADDR))
862 own_querier_enabled = false;
864 own_querier_enabled = true;
866 own_querier_enabled = false;
869 return time_is_before_jiffies(querier->delay_time) &&
870 (own_querier_enabled || timer_pending(&querier->timer));
873 static inline bool br_multicast_querier_exists(struct net_bridge *br,
876 switch (eth->h_proto) {
877 case (htons(ETH_P_IP)):
878 return __br_multicast_querier_exists(br,
879 &br->ip4_other_query, false);
880 #if IS_ENABLED(CONFIG_IPV6)
881 case (htons(ETH_P_IPV6)):
882 return __br_multicast_querier_exists(br,
883 &br->ip6_other_query, true);
890 static inline bool br_multicast_is_star_g(const struct br_ip *ip)
893 case htons(ETH_P_IP):
894 return ipv4_is_zeronet(ip->src.ip4);
895 #if IS_ENABLED(CONFIG_IPV6)
896 case htons(ETH_P_IPV6):
897 return ipv6_addr_any(&ip->src.ip6);
904 static inline bool br_multicast_should_handle_mode(const struct net_bridge *br,
908 case htons(ETH_P_IP):
909 return !!(br->multicast_igmp_version == 3);
910 #if IS_ENABLED(CONFIG_IPV6)
911 case htons(ETH_P_IPV6):
912 return !!(br->multicast_mld_version == 2);
919 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
921 return BR_INPUT_SKB_CB(skb)->igmp;
924 static inline unsigned long br_multicast_lmqt(const struct net_bridge *br)
926 return br->multicast_last_member_interval *
927 br->multicast_last_member_count;
930 static inline unsigned long br_multicast_gmi(const struct net_bridge *br)
932 /* use the RFC default of 2 for QRV */
933 return 2 * br->multicast_query_interval +
934 br->multicast_query_response_interval;
937 static inline int br_multicast_rcv(struct net_bridge *br,
938 struct net_bridge_port *port,
945 static inline struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
946 struct sk_buff *skb, u16 vid)
951 static inline int br_multicast_add_port(struct net_bridge_port *port)
956 static inline void br_multicast_del_port(struct net_bridge_port *port)
960 static inline void br_multicast_enable_port(struct net_bridge_port *port)
964 static inline void br_multicast_disable_port(struct net_bridge_port *port)
968 static inline void br_multicast_init(struct net_bridge *br)
972 static inline void br_multicast_open(struct net_bridge *br)
976 static inline void br_multicast_stop(struct net_bridge *br)
980 static inline void br_multicast_dev_del(struct net_bridge *br)
984 static inline void br_multicast_flood(struct net_bridge_mdb_entry *mdst,
986 bool local_rcv, bool local_orig)
990 static inline bool br_multicast_is_router(struct net_bridge *br)
995 static inline bool br_multicast_querier_exists(struct net_bridge *br,
1001 static inline void br_mdb_init(void)
1005 static inline void br_mdb_uninit(void)
1009 static inline int br_mdb_hash_init(struct net_bridge *br)
1014 static inline void br_mdb_hash_fini(struct net_bridge *br)
1018 static inline void br_multicast_count(struct net_bridge *br,
1019 const struct net_bridge_port *p,
1020 const struct sk_buff *skb,
1025 static inline int br_multicast_init_stats(struct net_bridge *br)
1030 static inline void br_multicast_uninit_stats(struct net_bridge *br)
1034 static inline int br_multicast_igmp_type(const struct sk_buff *skb)
1041 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1042 bool br_allowed_ingress(const struct net_bridge *br,
1043 struct net_bridge_vlan_group *vg, struct sk_buff *skb,
1044 u16 *vid, u8 *state);
1045 bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1046 const struct sk_buff *skb);
1047 bool br_should_learn(struct net_bridge_port *p, struct sk_buff *skb, u16 *vid);
1048 struct sk_buff *br_handle_vlan(struct net_bridge *br,
1049 const struct net_bridge_port *port,
1050 struct net_bridge_vlan_group *vg,
1051 struct sk_buff *skb);
1052 int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1053 bool *changed, struct netlink_ext_ack *extack);
1054 int br_vlan_delete(struct net_bridge *br, u16 vid);
1055 void br_vlan_flush(struct net_bridge *br);
1056 struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg, u16 vid);
1057 void br_recalculate_fwd_mask(struct net_bridge *br);
1058 int __br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
1059 int br_vlan_filter_toggle(struct net_bridge *br, unsigned long val);
1060 int __br_vlan_set_proto(struct net_bridge *br, __be16 proto);
1061 int br_vlan_set_proto(struct net_bridge *br, unsigned long val);
1062 int br_vlan_set_stats(struct net_bridge *br, unsigned long val);
1063 int br_vlan_set_stats_per_port(struct net_bridge *br, unsigned long val);
1064 int br_vlan_init(struct net_bridge *br);
1065 int br_vlan_set_default_pvid(struct net_bridge *br, unsigned long val);
1066 int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid,
1067 struct netlink_ext_ack *extack);
1068 int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1069 bool *changed, struct netlink_ext_ack *extack);
1070 int nbp_vlan_delete(struct net_bridge_port *port, u16 vid);
1071 void nbp_vlan_flush(struct net_bridge_port *port);
1072 int nbp_vlan_init(struct net_bridge_port *port, struct netlink_ext_ack *extack);
1073 int nbp_get_num_vlan_infos(struct net_bridge_port *p, u32 filter_mask);
1074 void br_vlan_get_stats(const struct net_bridge_vlan *v,
1075 struct br_vlan_stats *stats);
1076 void br_vlan_port_event(struct net_bridge_port *p, unsigned long event);
1077 int br_vlan_bridge_event(struct net_device *dev, unsigned long event,
1079 void br_vlan_rtnl_init(void);
1080 void br_vlan_rtnl_uninit(void);
1081 void br_vlan_notify(const struct net_bridge *br,
1082 const struct net_bridge_port *p,
1083 u16 vid, u16 vid_range,
1085 bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1086 const struct net_bridge_vlan *range_end);
1088 static inline struct net_bridge_vlan_group *br_vlan_group(
1089 const struct net_bridge *br)
1091 return rtnl_dereference(br->vlgrp);
1094 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1095 const struct net_bridge_port *p)
1097 return rtnl_dereference(p->vlgrp);
1100 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1101 const struct net_bridge *br)
1103 return rcu_dereference(br->vlgrp);
1106 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1107 const struct net_bridge_port *p)
1109 return rcu_dereference(p->vlgrp);
1112 /* Since bridge now depends on 8021Q module, but the time bridge sees the
1113 * skb, the vlan tag will always be present if the frame was tagged.
1115 static inline int br_vlan_get_tag(const struct sk_buff *skb, u16 *vid)
1119 if (skb_vlan_tag_present(skb)) {
1120 *vid = skb_vlan_tag_get_id(skb);
1129 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1138 static inline u16 br_vlan_flags(const struct net_bridge_vlan *v, u16 pvid)
1140 return v->vid == pvid ? v->flags | BRIDGE_VLAN_INFO_PVID : v->flags;
1143 static inline bool br_allowed_ingress(const struct net_bridge *br,
1144 struct net_bridge_vlan_group *vg,
1145 struct sk_buff *skb,
1146 u16 *vid, u8 *state)
1151 static inline bool br_allowed_egress(struct net_bridge_vlan_group *vg,
1152 const struct sk_buff *skb)
1157 static inline bool br_should_learn(struct net_bridge_port *p,
1158 struct sk_buff *skb, u16 *vid)
1163 static inline struct sk_buff *br_handle_vlan(struct net_bridge *br,
1164 const struct net_bridge_port *port,
1165 struct net_bridge_vlan_group *vg,
1166 struct sk_buff *skb)
1171 static inline int br_vlan_add(struct net_bridge *br, u16 vid, u16 flags,
1172 bool *changed, struct netlink_ext_ack *extack)
1178 static inline int br_vlan_delete(struct net_bridge *br, u16 vid)
1183 static inline void br_vlan_flush(struct net_bridge *br)
1187 static inline void br_recalculate_fwd_mask(struct net_bridge *br)
1191 static inline int br_vlan_init(struct net_bridge *br)
1196 static inline int nbp_vlan_add(struct net_bridge_port *port, u16 vid, u16 flags,
1197 bool *changed, struct netlink_ext_ack *extack)
1203 static inline int nbp_vlan_delete(struct net_bridge_port *port, u16 vid)
1208 static inline void nbp_vlan_flush(struct net_bridge_port *port)
1212 static inline struct net_bridge_vlan *br_vlan_find(struct net_bridge_vlan_group *vg,
1218 static inline int nbp_vlan_init(struct net_bridge_port *port,
1219 struct netlink_ext_ack *extack)
1224 static inline u16 br_vlan_get_tag(const struct sk_buff *skb, u16 *tag)
1229 static inline u16 br_get_pvid(const struct net_bridge_vlan_group *vg)
1234 static inline int __br_vlan_filter_toggle(struct net_bridge *br,
1240 static inline int nbp_get_num_vlan_infos(struct net_bridge_port *p,
1246 static inline struct net_bridge_vlan_group *br_vlan_group(
1247 const struct net_bridge *br)
1252 static inline struct net_bridge_vlan_group *nbp_vlan_group(
1253 const struct net_bridge_port *p)
1258 static inline struct net_bridge_vlan_group *br_vlan_group_rcu(
1259 const struct net_bridge *br)
1264 static inline struct net_bridge_vlan_group *nbp_vlan_group_rcu(
1265 const struct net_bridge_port *p)
1270 static inline void br_vlan_get_stats(const struct net_bridge_vlan *v,
1271 struct br_vlan_stats *stats)
1275 static inline void br_vlan_port_event(struct net_bridge_port *p,
1276 unsigned long event)
1280 static inline int br_vlan_bridge_event(struct net_device *dev,
1281 unsigned long event, void *ptr)
1286 static inline void br_vlan_rtnl_init(void)
1290 static inline void br_vlan_rtnl_uninit(void)
1294 static inline void br_vlan_notify(const struct net_bridge *br,
1295 const struct net_bridge_port *p,
1296 u16 vid, u16 vid_range,
1301 static inline bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr,
1302 const struct net_bridge_vlan *range_end)
1308 /* br_vlan_options.c */
1309 #ifdef CONFIG_BRIDGE_VLAN_FILTERING
1310 bool br_vlan_opts_eq_range(const struct net_bridge_vlan *v_curr,
1311 const struct net_bridge_vlan *range_end);
1312 bool br_vlan_opts_fill(struct sk_buff *skb, const struct net_bridge_vlan *v);
1313 size_t br_vlan_opts_nl_size(void);
1314 int br_vlan_process_options(const struct net_bridge *br,
1315 const struct net_bridge_port *p,
1316 struct net_bridge_vlan *range_start,
1317 struct net_bridge_vlan *range_end,
1319 struct netlink_ext_ack *extack);
1321 /* vlan state manipulation helpers using *_ONCE to annotate lock-free access */
1322 static inline u8 br_vlan_get_state(const struct net_bridge_vlan *v)
1324 return READ_ONCE(v->state);
1327 static inline void br_vlan_set_state(struct net_bridge_vlan *v, u8 state)
1329 WRITE_ONCE(v->state, state);
1332 static inline u8 br_vlan_get_pvid_state(const struct net_bridge_vlan_group *vg)
1334 return READ_ONCE(vg->pvid_state);
1337 static inline void br_vlan_set_pvid_state(struct net_bridge_vlan_group *vg,
1340 WRITE_ONCE(vg->pvid_state, state);
1343 /* learn_allow is true at ingress and false at egress */
1344 static inline bool br_vlan_state_allowed(u8 state, bool learn_allow)
1347 case BR_STATE_LEARNING:
1349 case BR_STATE_FORWARDING:
1358 int (*br_dev_xmit_hook)(struct sk_buff *skb);
1360 extern const struct nf_br_ops __rcu *nf_br_ops;
1362 /* br_netfilter.c */
1363 #if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
1364 int br_nf_core_init(void);
1365 void br_nf_core_fini(void);
1366 void br_netfilter_rtable_init(struct net_bridge *);
1368 static inline int br_nf_core_init(void) { return 0; }
1369 static inline void br_nf_core_fini(void) {}
1370 #define br_netfilter_rtable_init(x)
1374 void br_set_state(struct net_bridge_port *p, unsigned int state);
1375 struct net_bridge_port *br_get_port(struct net_bridge *br, u16 port_no);
1376 void br_init_port(struct net_bridge_port *p);
1377 void br_become_designated_port(struct net_bridge_port *p);
1379 void __br_set_forward_delay(struct net_bridge *br, unsigned long t);
1380 int br_set_forward_delay(struct net_bridge *br, unsigned long x);
1381 int br_set_hello_time(struct net_bridge *br, unsigned long x);
1382 int br_set_max_age(struct net_bridge *br, unsigned long x);
1383 int __set_ageing_time(struct net_device *dev, unsigned long t);
1384 int br_set_ageing_time(struct net_bridge *br, clock_t ageing_time);
1388 void br_stp_enable_bridge(struct net_bridge *br);
1389 void br_stp_disable_bridge(struct net_bridge *br);
1390 int br_stp_set_enabled(struct net_bridge *br, unsigned long val,
1391 struct netlink_ext_ack *extack);
1392 void br_stp_enable_port(struct net_bridge_port *p);
1393 void br_stp_disable_port(struct net_bridge_port *p);
1394 bool br_stp_recalculate_bridge_id(struct net_bridge *br);
1395 void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
1396 void br_stp_set_bridge_priority(struct net_bridge *br, u16 newprio);
1397 int br_stp_set_port_priority(struct net_bridge_port *p, unsigned long newprio);
1398 int br_stp_set_path_cost(struct net_bridge_port *p, unsigned long path_cost);
1399 ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
1403 void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
1404 struct net_device *dev);
1406 /* br_stp_timer.c */
1407 void br_stp_timer_init(struct net_bridge *br);
1408 void br_stp_port_timer_init(struct net_bridge_port *p);
1409 unsigned long br_timer_value(const struct timer_list *timer);
1412 #if IS_ENABLED(CONFIG_ATM_LANE)
1413 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
1417 #if IS_ENABLED(CONFIG_BRIDGE_MRP)
1418 int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1419 struct nlattr *attr, int cmd, struct netlink_ext_ack *extack);
1420 int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb);
1421 bool br_mrp_enabled(struct net_bridge *br);
1422 void br_mrp_port_del(struct net_bridge *br, struct net_bridge_port *p);
1423 int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br);
1425 static inline int br_mrp_parse(struct net_bridge *br, struct net_bridge_port *p,
1426 struct nlattr *attr, int cmd,
1427 struct netlink_ext_ack *extack)
1432 static inline int br_mrp_process(struct net_bridge_port *p, struct sk_buff *skb)
1437 static inline bool br_mrp_enabled(struct net_bridge *br)
1442 static inline void br_mrp_port_del(struct net_bridge *br,
1443 struct net_bridge_port *p)
1447 static inline int br_mrp_fill_info(struct sk_buff *skb, struct net_bridge *br)
1455 extern struct rtnl_link_ops br_link_ops;
1456 int br_netlink_init(void);
1457 void br_netlink_fini(void);
1458 void br_ifinfo_notify(int event, const struct net_bridge *br,
1459 const struct net_bridge_port *port);
1460 int br_setlink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags,
1461 struct netlink_ext_ack *extack);
1462 int br_dellink(struct net_device *dev, struct nlmsghdr *nlmsg, u16 flags);
1463 int br_getlink(struct sk_buff *skb, u32 pid, u32 seq, struct net_device *dev,
1464 u32 filter_mask, int nlflags);
1465 int br_process_vlan_info(struct net_bridge *br,
1466 struct net_bridge_port *p, int cmd,
1467 struct bridge_vlan_info *vinfo_curr,
1468 struct bridge_vlan_info **vinfo_last,
1470 struct netlink_ext_ack *extack);
1474 extern const struct sysfs_ops brport_sysfs_ops;
1475 int br_sysfs_addif(struct net_bridge_port *p);
1476 int br_sysfs_renameif(struct net_bridge_port *p);
1479 int br_sysfs_addbr(struct net_device *dev);
1480 void br_sysfs_delbr(struct net_device *dev);
1484 static inline int br_sysfs_addif(struct net_bridge_port *p) { return 0; }
1485 static inline int br_sysfs_renameif(struct net_bridge_port *p) { return 0; }
1486 static inline int br_sysfs_addbr(struct net_device *dev) { return 0; }
1487 static inline void br_sysfs_delbr(struct net_device *dev) { return; }
1488 #endif /* CONFIG_SYSFS */
1490 /* br_switchdev.c */
1491 #ifdef CONFIG_NET_SWITCHDEV
1492 int nbp_switchdev_mark_set(struct net_bridge_port *p);
1493 void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1494 struct sk_buff *skb);
1495 bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1496 const struct sk_buff *skb);
1497 int br_switchdev_set_port_flag(struct net_bridge_port *p,
1498 unsigned long flags,
1499 unsigned long mask);
1500 void br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb,
1502 int br_switchdev_port_vlan_add(struct net_device *dev, u16 vid, u16 flags,
1503 struct netlink_ext_ack *extack);
1504 int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid);
1506 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1508 skb->offload_fwd_mark = 0;
1511 static inline int nbp_switchdev_mark_set(struct net_bridge_port *p)
1516 static inline void nbp_switchdev_frame_mark(const struct net_bridge_port *p,
1517 struct sk_buff *skb)
1521 static inline bool nbp_switchdev_allowed_egress(const struct net_bridge_port *p,
1522 const struct sk_buff *skb)
1527 static inline int br_switchdev_set_port_flag(struct net_bridge_port *p,
1528 unsigned long flags,
1534 static inline int br_switchdev_port_vlan_add(struct net_device *dev,
1536 struct netlink_ext_ack *extack)
1541 static inline int br_switchdev_port_vlan_del(struct net_device *dev, u16 vid)
1547 br_switchdev_fdb_notify(const struct net_bridge_fdb_entry *fdb, int type)
1551 static inline void br_switchdev_frame_unmark(struct sk_buff *skb)
1554 #endif /* CONFIG_NET_SWITCHDEV */
1556 /* br_arp_nd_proxy.c */
1557 void br_recalculate_neigh_suppress_enabled(struct net_bridge *br);
1558 void br_do_proxy_suppress_arp(struct sk_buff *skb, struct net_bridge *br,
1559 u16 vid, struct net_bridge_port *p);
1560 void br_do_suppress_nd(struct sk_buff *skb, struct net_bridge *br,
1561 u16 vid, struct net_bridge_port *p, struct nd_msg *msg);
1562 struct nd_msg *br_is_nd_neigh_msg(struct sk_buff *skb, struct nd_msg *m);