3 * Linux ethernet bridge
6 * Lennert Buytenhek <buytenh@gnu.org>
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License
10 * as published by the Free Software Foundation; either version
11 * 2 of the License, or (at your option) any later version.
14 #include <linux/kernel.h>
15 #include <linux/init.h>
16 #include <linux/rculist.h>
17 #include <linux/spinlock.h>
18 #include <linux/times.h>
19 #include <linux/netdevice.h>
20 #include <linux/etherdevice.h>
21 #include <linux/jhash.h>
22 #include <linux/random.h>
23 #include <linux/slab.h>
24 #include <linux/atomic.h>
25 #include <asm/unaligned.h>
26 #include <linux/if_vlan.h>
27 #include <net/switchdev.h>
28 #include <trace/events/bridge.h>
29 #include "br_private.h"
31 static const struct rhashtable_params br_fdb_rht_params = {
32 .head_offset = offsetof(struct net_bridge_fdb_entry, rhnode),
33 .key_offset = offsetof(struct net_bridge_fdb_entry, key),
34 .key_len = sizeof(struct net_bridge_fdb_key),
35 .automatic_shrinking = true,
39 static struct kmem_cache *br_fdb_cache __read_mostly;
40 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
41 const unsigned char *addr, u16 vid);
42 static void fdb_notify(struct net_bridge *br,
43 const struct net_bridge_fdb_entry *, int, bool);
45 int __init br_fdb_init(void)
47 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
48 sizeof(struct net_bridge_fdb_entry),
50 SLAB_HWCACHE_ALIGN, NULL);
57 void br_fdb_fini(void)
59 kmem_cache_destroy(br_fdb_cache);
62 int br_fdb_hash_init(struct net_bridge *br)
64 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
67 void br_fdb_hash_fini(struct net_bridge *br)
69 rhashtable_destroy(&br->fdb_hash_tbl);
72 /* if topology_changing then use forward_delay (default 15 sec)
73 * otherwise keep longer (default 5 minutes)
75 static inline unsigned long hold_time(const struct net_bridge *br)
77 return br->topology_change ? br->forward_delay : br->ageing_time;
80 static inline int has_expired(const struct net_bridge *br,
81 const struct net_bridge_fdb_entry *fdb)
83 return !fdb->is_static && !fdb->added_by_external_learn &&
84 time_before_eq(fdb->updated + hold_time(br), jiffies);
87 static void fdb_rcu_free(struct rcu_head *head)
89 struct net_bridge_fdb_entry *ent
90 = container_of(head, struct net_bridge_fdb_entry, rcu);
91 kmem_cache_free(br_fdb_cache, ent);
94 static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
95 const unsigned char *addr,
98 struct net_bridge_fdb_key key;
100 WARN_ON_ONCE(!rcu_read_lock_held());
103 memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
105 return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
108 /* requires bridge hash_lock */
109 static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
110 const unsigned char *addr,
113 struct net_bridge_fdb_entry *fdb;
115 lockdep_assert_held_once(&br->hash_lock);
118 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
124 struct net_device *br_fdb_find_port(const struct net_device *br_dev,
125 const unsigned char *addr,
128 struct net_bridge_fdb_entry *f;
129 struct net_device *dev = NULL;
130 struct net_bridge *br;
134 if (!netif_is_bridge_master(br_dev))
137 br = netdev_priv(br_dev);
139 f = br_fdb_find_rcu(br, addr, vid);
146 EXPORT_SYMBOL_GPL(br_fdb_find_port);
148 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
149 const unsigned char *addr,
152 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
155 /* When a static FDB entry is added, the mac address from the entry is
156 * added to the bridge private HW address list and all required ports
157 * are then updated with the new information.
160 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
163 struct net_bridge_port *p;
167 list_for_each_entry(p, &br->port_list, list) {
168 if (!br_promisc_port(p)) {
169 err = dev_uc_add(p->dev, addr);
177 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
178 if (!br_promisc_port(p))
179 dev_uc_del(p->dev, addr);
183 /* When a static FDB entry is deleted, the HW address from that entry is
184 * also removed from the bridge private HW address list and updates all
185 * the ports with needed information.
188 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
190 struct net_bridge_port *p;
194 list_for_each_entry(p, &br->port_list, list) {
195 if (!br_promisc_port(p))
196 dev_uc_del(p->dev, addr);
200 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
203 trace_fdb_delete(br, f);
206 fdb_del_hw_addr(br, f->key.addr.addr);
208 hlist_del_init_rcu(&f->fdb_node);
209 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
211 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
212 call_rcu(&f->rcu, fdb_rcu_free);
215 /* Delete a local entry if no other port had the same address. */
216 static void fdb_delete_local(struct net_bridge *br,
217 const struct net_bridge_port *p,
218 struct net_bridge_fdb_entry *f)
220 const unsigned char *addr = f->key.addr.addr;
221 struct net_bridge_vlan_group *vg;
222 const struct net_bridge_vlan *v;
223 struct net_bridge_port *op;
224 u16 vid = f->key.vlan_id;
226 /* Maybe another port has same hw addr? */
227 list_for_each_entry(op, &br->port_list, list) {
228 vg = nbp_vlan_group(op);
229 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
230 (!vid || br_vlan_find(vg, vid))) {
232 f->added_by_user = 0;
237 vg = br_vlan_group(br);
238 v = br_vlan_find(vg, vid);
239 /* Maybe bridge device has same hw addr? */
240 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
241 (!vid || (v && br_vlan_should_use(v)))) {
243 f->added_by_user = 0;
247 fdb_delete(br, f, true);
250 void br_fdb_find_delete_local(struct net_bridge *br,
251 const struct net_bridge_port *p,
252 const unsigned char *addr, u16 vid)
254 struct net_bridge_fdb_entry *f;
256 spin_lock_bh(&br->hash_lock);
257 f = br_fdb_find(br, addr, vid);
258 if (f && f->is_local && !f->added_by_user && f->dst == p)
259 fdb_delete_local(br, p, f);
260 spin_unlock_bh(&br->hash_lock);
263 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
265 struct net_bridge_vlan_group *vg;
266 struct net_bridge_fdb_entry *f;
267 struct net_bridge *br = p->br;
268 struct net_bridge_vlan *v;
270 spin_lock_bh(&br->hash_lock);
271 vg = nbp_vlan_group(p);
272 hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
273 if (f->dst == p && f->is_local && !f->added_by_user) {
275 fdb_delete_local(br, p, f);
277 /* if this port has no vlan information
278 * configured, we can safely be done at
281 if (!vg || !vg->num_vlans)
287 /* insert new address, may fail if invalid address or dup. */
288 fdb_insert(br, p, newaddr, 0);
290 if (!vg || !vg->num_vlans)
293 /* Now add entries for every VLAN configured on the port.
294 * This function runs under RTNL so the bitmap will not change
297 list_for_each_entry(v, &vg->vlan_list, vlist)
298 fdb_insert(br, p, newaddr, v->vid);
301 spin_unlock_bh(&br->hash_lock);
304 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
306 struct net_bridge_vlan_group *vg;
307 struct net_bridge_fdb_entry *f;
308 struct net_bridge_vlan *v;
310 spin_lock_bh(&br->hash_lock);
312 /* If old entry was unassociated with any port, then delete it. */
313 f = br_fdb_find(br, br->dev->dev_addr, 0);
314 if (f && f->is_local && !f->dst && !f->added_by_user)
315 fdb_delete_local(br, NULL, f);
317 fdb_insert(br, NULL, newaddr, 0);
318 vg = br_vlan_group(br);
319 if (!vg || !vg->num_vlans)
321 /* Now remove and add entries for every VLAN configured on the
322 * bridge. This function runs under RTNL so the bitmap will not
323 * change from under us.
325 list_for_each_entry(v, &vg->vlan_list, vlist) {
326 if (!br_vlan_should_use(v))
328 f = br_fdb_find(br, br->dev->dev_addr, v->vid);
329 if (f && f->is_local && !f->dst && !f->added_by_user)
330 fdb_delete_local(br, NULL, f);
331 fdb_insert(br, NULL, newaddr, v->vid);
334 spin_unlock_bh(&br->hash_lock);
337 void br_fdb_cleanup(struct work_struct *work)
339 struct net_bridge *br = container_of(work, struct net_bridge,
341 struct net_bridge_fdb_entry *f = NULL;
342 unsigned long delay = hold_time(br);
343 unsigned long work_delay = delay;
344 unsigned long now = jiffies;
346 /* this part is tricky, in order to avoid blocking learning and
347 * consequently forwarding, we rely on rcu to delete objects with
348 * delayed freeing allowing us to continue traversing
351 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
352 unsigned long this_timer;
354 if (f->is_static || f->added_by_external_learn)
356 this_timer = f->updated + delay;
357 if (time_after(this_timer, now)) {
358 work_delay = min(work_delay, this_timer - now);
360 spin_lock_bh(&br->hash_lock);
361 if (!hlist_unhashed(&f->fdb_node))
362 fdb_delete(br, f, true);
363 spin_unlock_bh(&br->hash_lock);
368 /* Cleanup minimum 10 milliseconds apart */
369 work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
370 mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
373 /* Completely flush all dynamic entries in forwarding database.*/
374 void br_fdb_flush(struct net_bridge *br)
376 struct net_bridge_fdb_entry *f;
377 struct hlist_node *tmp;
379 spin_lock_bh(&br->hash_lock);
380 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
382 fdb_delete(br, f, true);
384 spin_unlock_bh(&br->hash_lock);
387 /* Flush all entries referring to a specific port.
388 * if do_all is set also flush static entries
389 * if vid is set delete all entries that match the vlan_id
391 void br_fdb_delete_by_port(struct net_bridge *br,
392 const struct net_bridge_port *p,
396 struct net_bridge_fdb_entry *f;
397 struct hlist_node *tmp;
399 spin_lock_bh(&br->hash_lock);
400 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
405 if (f->is_static || (vid && f->key.vlan_id != vid))
409 fdb_delete_local(br, p, f);
411 fdb_delete(br, f, true);
413 spin_unlock_bh(&br->hash_lock);
416 #if IS_ENABLED(CONFIG_ATM_LANE)
417 /* Interface used by ATM LANE hook to test
418 * if an addr is on some other bridge port */
419 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
421 struct net_bridge_fdb_entry *fdb;
422 struct net_bridge_port *port;
426 port = br_port_get_rcu(dev);
430 fdb = br_fdb_find_rcu(port->br, addr, 0);
431 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
432 fdb->dst->state == BR_STATE_FORWARDING;
438 #endif /* CONFIG_ATM_LANE */
441 * Fill buffer with forwarding table records in
444 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
445 unsigned long maxnum, unsigned long skip)
447 struct net_bridge_fdb_entry *f;
448 struct __fdb_entry *fe = buf;
451 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
454 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
458 if (has_expired(br, f))
461 /* ignore pseudo entry for local MAC address */
470 /* convert from internal format to API */
471 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
473 /* due to ABI compat need to split into hi/lo */
474 fe->port_no = f->dst->port_no;
475 fe->port_hi = f->dst->port_no >> 8;
477 fe->is_local = f->is_local;
479 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
488 static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
489 struct net_bridge_port *source,
490 const unsigned char *addr,
492 unsigned char is_local,
493 unsigned char is_static)
495 struct net_bridge_fdb_entry *fdb;
497 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
499 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
501 fdb->key.vlan_id = vid;
502 fdb->is_local = is_local;
503 fdb->is_static = is_static;
504 fdb->added_by_user = 0;
505 fdb->added_by_external_learn = 0;
508 fdb->updated = fdb->used = jiffies;
509 if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
511 br_fdb_rht_params)) {
512 kmem_cache_free(br_fdb_cache, fdb);
515 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
521 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
522 const unsigned char *addr, u16 vid)
524 struct net_bridge_fdb_entry *fdb;
526 if (!is_valid_ether_addr(addr))
529 fdb = br_fdb_find(br, addr, vid);
531 /* it is okay to have multiple ports with same
532 * address, just use the first one.
536 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
537 source ? source->dev->name : br->dev->name, addr, vid);
538 fdb_delete(br, fdb, true);
541 fdb = fdb_create(br, source, addr, vid, 1, 1);
545 fdb_add_hw_addr(br, addr);
546 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
550 /* Add entry for local address of interface */
551 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
552 const unsigned char *addr, u16 vid)
556 spin_lock_bh(&br->hash_lock);
557 ret = fdb_insert(br, source, addr, vid);
558 spin_unlock_bh(&br->hash_lock);
562 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
563 const unsigned char *addr, u16 vid, bool added_by_user)
565 struct net_bridge_fdb_entry *fdb;
566 bool fdb_modified = false;
568 /* some users want to always flood. */
569 if (hold_time(br) == 0)
572 /* ignore packets unless we are using this port */
573 if (!(source->state == BR_STATE_LEARNING ||
574 source->state == BR_STATE_FORWARDING))
577 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
579 /* attempt to update an entry for a local interface */
580 if (unlikely(fdb->is_local)) {
582 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
583 source->dev->name, addr, vid);
585 unsigned long now = jiffies;
587 /* fastpath: update of existing entry */
588 if (unlikely(source != fdb->dst && !fdb->is_sticky)) {
591 /* Take over HW learned entry */
592 if (unlikely(fdb->added_by_external_learn))
593 fdb->added_by_external_learn = 0;
595 if (now != fdb->updated)
597 if (unlikely(added_by_user))
598 fdb->added_by_user = 1;
599 if (unlikely(fdb_modified)) {
600 trace_br_fdb_update(br, source, addr, vid, added_by_user);
601 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
605 spin_lock(&br->hash_lock);
606 fdb = fdb_create(br, source, addr, vid, 0, 0);
608 if (unlikely(added_by_user))
609 fdb->added_by_user = 1;
610 trace_br_fdb_update(br, source, addr, vid,
612 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
614 /* else we lose race and someone else inserts
615 * it first, don't bother updating
617 spin_unlock(&br->hash_lock);
621 static int fdb_to_nud(const struct net_bridge *br,
622 const struct net_bridge_fdb_entry *fdb)
625 return NUD_PERMANENT;
626 else if (fdb->is_static)
628 else if (has_expired(br, fdb))
631 return NUD_REACHABLE;
634 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
635 const struct net_bridge_fdb_entry *fdb,
636 u32 portid, u32 seq, int type, unsigned int flags)
638 unsigned long now = jiffies;
639 struct nda_cacheinfo ci;
640 struct nlmsghdr *nlh;
643 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
647 ndm = nlmsg_data(nlh);
648 ndm->ndm_family = AF_BRIDGE;
653 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
654 ndm->ndm_state = fdb_to_nud(br, fdb);
657 ndm->ndm_flags |= NTF_OFFLOADED;
658 if (fdb->added_by_external_learn)
659 ndm->ndm_flags |= NTF_EXT_LEARNED;
661 ndm->ndm_flags |= NTF_STICKY;
663 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
664 goto nla_put_failure;
665 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
666 goto nla_put_failure;
667 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
668 ci.ndm_confirmed = 0;
669 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
671 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
672 goto nla_put_failure;
674 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
676 goto nla_put_failure;
682 nlmsg_cancel(skb, nlh);
686 static inline size_t fdb_nlmsg_size(void)
688 return NLMSG_ALIGN(sizeof(struct ndmsg))
689 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
690 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
691 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
692 + nla_total_size(sizeof(struct nda_cacheinfo));
695 static void fdb_notify(struct net_bridge *br,
696 const struct net_bridge_fdb_entry *fdb, int type,
699 struct net *net = dev_net(br->dev);
704 br_switchdev_fdb_notify(fdb, type);
706 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
710 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
712 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
713 WARN_ON(err == -EMSGSIZE);
717 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
720 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
723 /* Dump information about entries, in response to GETNEIGH */
724 int br_fdb_dump(struct sk_buff *skb,
725 struct netlink_callback *cb,
726 struct net_device *dev,
727 struct net_device *filter_dev,
730 struct net_bridge *br = netdev_priv(dev);
731 struct net_bridge_fdb_entry *f;
734 if (!(dev->priv_flags & IFF_EBRIDGE))
738 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
744 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
745 if (*idx < cb->args[2])
747 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
748 if (filter_dev != dev)
750 /* !f->dst is a special case for bridge
751 * It means the MAC belongs to the bridge
752 * Therefore need a little more filtering
753 * we only want to dump the !f->dst case
758 if (!filter_dev && f->dst)
761 err = fdb_fill_info(skb, br, f,
762 NETLINK_CB(cb->skb).portid,
776 int br_fdb_get(struct sk_buff *skb,
778 struct net_device *dev,
779 const unsigned char *addr,
780 u16 vid, u32 portid, u32 seq,
781 struct netlink_ext_ack *extack)
783 struct net_bridge *br = netdev_priv(dev);
784 struct net_bridge_fdb_entry *f;
788 f = br_fdb_find_rcu(br, addr, vid);
790 NL_SET_ERR_MSG(extack, "Fdb entry not found");
795 err = fdb_fill_info(skb, br, f, portid, seq,
802 /* Update (create or replace) forwarding database entry */
803 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
804 const u8 *addr, u16 state, u16 flags, u16 vid,
807 u8 is_sticky = !!(ndm_flags & NTF_STICKY);
808 struct net_bridge_fdb_entry *fdb;
809 bool modified = false;
811 /* If the port cannot learn allow only local and static entries */
812 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
813 !(source->state == BR_STATE_LEARNING ||
814 source->state == BR_STATE_FORWARDING))
817 if (!source && !(state & NUD_PERMANENT)) {
818 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
823 if (is_sticky && (state & NUD_PERMANENT))
826 fdb = br_fdb_find(br, addr, vid);
828 if (!(flags & NLM_F_CREATE))
831 fdb = fdb_create(br, source, addr, vid, 0, 0);
837 if (flags & NLM_F_EXCL)
840 if (fdb->dst != source) {
846 if (fdb_to_nud(br, fdb) != state) {
847 if (state & NUD_PERMANENT) {
849 if (!fdb->is_static) {
851 fdb_add_hw_addr(br, addr);
853 } else if (state & NUD_NOARP) {
855 if (!fdb->is_static) {
857 fdb_add_hw_addr(br, addr);
861 if (fdb->is_static) {
863 fdb_del_hw_addr(br, addr);
870 if (is_sticky != fdb->is_sticky) {
871 fdb->is_sticky = is_sticky;
875 fdb->added_by_user = 1;
879 fdb->updated = jiffies;
880 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
886 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
887 struct net_bridge_port *p, const unsigned char *addr,
888 u16 nlh_flags, u16 vid)
892 if (ndm->ndm_flags & NTF_USE) {
894 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
900 br_fdb_update(br, p, addr, vid, true);
903 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
904 err = br_fdb_external_learn_add(br, p, addr, vid, true);
906 spin_lock_bh(&br->hash_lock);
907 err = fdb_add_entry(br, p, addr, ndm->ndm_state,
908 nlh_flags, vid, ndm->ndm_flags);
909 spin_unlock_bh(&br->hash_lock);
915 /* Add new permanent fdb entry with RTM_NEWNEIGH */
916 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
917 struct net_device *dev,
918 const unsigned char *addr, u16 vid, u16 nlh_flags,
919 struct netlink_ext_ack *extack)
921 struct net_bridge_vlan_group *vg;
922 struct net_bridge_port *p = NULL;
923 struct net_bridge_vlan *v;
924 struct net_bridge *br = NULL;
927 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
929 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
930 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
934 if (is_zero_ether_addr(addr)) {
935 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
939 if (dev->priv_flags & IFF_EBRIDGE) {
940 br = netdev_priv(dev);
941 vg = br_vlan_group(br);
943 p = br_port_get_rtnl(dev);
945 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
950 vg = nbp_vlan_group(p);
954 v = br_vlan_find(vg, vid);
955 if (!v || !br_vlan_should_use(v)) {
956 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
960 /* VID was specified, so use it. */
961 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
963 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
964 if (err || !vg || !vg->num_vlans)
967 /* We have vlans configured on this port and user didn't
968 * specify a VLAN. To be nice, add/update entry for every
971 list_for_each_entry(v, &vg->vlan_list, vlist) {
972 if (!br_vlan_should_use(v))
974 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
984 static int fdb_delete_by_addr_and_port(struct net_bridge *br,
985 const struct net_bridge_port *p,
986 const u8 *addr, u16 vlan)
988 struct net_bridge_fdb_entry *fdb;
990 fdb = br_fdb_find(br, addr, vlan);
991 if (!fdb || fdb->dst != p)
994 fdb_delete(br, fdb, true);
999 static int __br_fdb_delete(struct net_bridge *br,
1000 const struct net_bridge_port *p,
1001 const unsigned char *addr, u16 vid)
1005 spin_lock_bh(&br->hash_lock);
1006 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1007 spin_unlock_bh(&br->hash_lock);
1012 /* Remove neighbor entry with RTM_DELNEIGH */
1013 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1014 struct net_device *dev,
1015 const unsigned char *addr, u16 vid)
1017 struct net_bridge_vlan_group *vg;
1018 struct net_bridge_port *p = NULL;
1019 struct net_bridge_vlan *v;
1020 struct net_bridge *br;
1023 if (dev->priv_flags & IFF_EBRIDGE) {
1024 br = netdev_priv(dev);
1025 vg = br_vlan_group(br);
1027 p = br_port_get_rtnl(dev);
1029 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1033 vg = nbp_vlan_group(p);
1038 v = br_vlan_find(vg, vid);
1040 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1044 err = __br_fdb_delete(br, p, addr, vid);
1047 err &= __br_fdb_delete(br, p, addr, 0);
1048 if (!vg || !vg->num_vlans)
1051 list_for_each_entry(v, &vg->vlan_list, vlist) {
1052 if (!br_vlan_should_use(v))
1054 err &= __br_fdb_delete(br, p, addr, v->vid);
1061 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1063 struct net_bridge_fdb_entry *f, *tmp;
1068 /* the key here is that static entries change only under rtnl */
1070 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1071 /* We only care for static entries */
1074 err = dev_uc_add(p->dev, f->key.addr.addr);
1084 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1085 /* We only care for static entries */
1086 if (!tmp->is_static)
1090 dev_uc_del(p->dev, tmp->key.addr.addr);
1096 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1098 struct net_bridge_fdb_entry *f;
1103 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1104 /* We only care for static entries */
1108 dev_uc_del(p->dev, f->key.addr.addr);
1113 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1114 const unsigned char *addr, u16 vid,
1117 struct net_bridge_fdb_entry *fdb;
1118 bool modified = false;
1121 trace_br_fdb_external_learn_add(br, p, addr, vid);
1123 spin_lock_bh(&br->hash_lock);
1125 fdb = br_fdb_find(br, addr, vid);
1127 fdb = fdb_create(br, p, addr, vid, 0, 0);
1133 fdb->added_by_user = 1;
1134 fdb->added_by_external_learn = 1;
1135 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1137 fdb->updated = jiffies;
1139 if (fdb->dst != p) {
1144 if (fdb->added_by_external_learn) {
1146 fdb->used = jiffies;
1147 } else if (!fdb->added_by_user) {
1148 /* Take over SW learned entry */
1149 fdb->added_by_external_learn = 1;
1154 fdb->added_by_user = 1;
1157 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1161 spin_unlock_bh(&br->hash_lock);
1166 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1167 const unsigned char *addr, u16 vid,
1170 struct net_bridge_fdb_entry *fdb;
1173 spin_lock_bh(&br->hash_lock);
1175 fdb = br_fdb_find(br, addr, vid);
1176 if (fdb && fdb->added_by_external_learn)
1177 fdb_delete(br, fdb, swdev_notify);
1181 spin_unlock_bh(&br->hash_lock);
1186 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1187 const unsigned char *addr, u16 vid, bool offloaded)
1189 struct net_bridge_fdb_entry *fdb;
1191 spin_lock_bh(&br->hash_lock);
1193 fdb = br_fdb_find(br, addr, vid);
1195 fdb->offloaded = offloaded;
1197 spin_unlock_bh(&br->hash_lock);
1200 void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1202 struct net_bridge_fdb_entry *f;
1203 struct net_bridge_port *p;
1207 p = br_port_get_rtnl(dev);
1211 spin_lock_bh(&p->br->hash_lock);
1212 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1213 if (f->dst == p && f->key.vlan_id == vid)
1216 spin_unlock_bh(&p->br->hash_lock);
1218 EXPORT_SYMBOL_GPL(br_fdb_clear_offload);