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,
38 static struct kmem_cache *br_fdb_cache __read_mostly;
39 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
40 const unsigned char *addr, u16 vid);
41 static void fdb_notify(struct net_bridge *br,
42 const struct net_bridge_fdb_entry *, int, bool);
44 int __init br_fdb_init(void)
46 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
47 sizeof(struct net_bridge_fdb_entry),
49 SLAB_HWCACHE_ALIGN, NULL);
56 void br_fdb_fini(void)
58 kmem_cache_destroy(br_fdb_cache);
61 int br_fdb_hash_init(struct net_bridge *br)
63 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
66 void br_fdb_hash_fini(struct net_bridge *br)
68 rhashtable_destroy(&br->fdb_hash_tbl);
71 /* if topology_changing then use forward_delay (default 15 sec)
72 * otherwise keep longer (default 5 minutes)
74 static inline unsigned long hold_time(const struct net_bridge *br)
76 return br->topology_change ? br->forward_delay : br->ageing_time;
79 static inline int has_expired(const struct net_bridge *br,
80 const struct net_bridge_fdb_entry *fdb)
82 return !fdb->is_static && !fdb->added_by_external_learn &&
83 time_before_eq(fdb->updated + hold_time(br), jiffies);
86 static void fdb_rcu_free(struct rcu_head *head)
88 struct net_bridge_fdb_entry *ent
89 = container_of(head, struct net_bridge_fdb_entry, rcu);
90 kmem_cache_free(br_fdb_cache, ent);
93 static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
94 const unsigned char *addr,
97 struct net_bridge_fdb_key key;
99 WARN_ON_ONCE(!rcu_read_lock_held());
102 memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
104 return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
107 /* requires bridge hash_lock */
108 static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
109 const unsigned char *addr,
112 struct net_bridge_fdb_entry *fdb;
114 lockdep_assert_held_once(&br->hash_lock);
117 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
123 struct net_device *br_fdb_find_port(const struct net_device *br_dev,
124 const unsigned char *addr,
127 struct net_bridge_fdb_entry *f;
128 struct net_device *dev = NULL;
129 struct net_bridge *br;
133 if (!netif_is_bridge_master(br_dev))
136 br = netdev_priv(br_dev);
138 f = br_fdb_find_rcu(br, addr, vid);
145 EXPORT_SYMBOL_GPL(br_fdb_find_port);
147 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
148 const unsigned char *addr,
151 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
154 /* When a static FDB entry is added, the mac address from the entry is
155 * added to the bridge private HW address list and all required ports
156 * are then updated with the new information.
159 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
162 struct net_bridge_port *p;
166 list_for_each_entry(p, &br->port_list, list) {
167 if (!br_promisc_port(p)) {
168 err = dev_uc_add(p->dev, addr);
176 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
177 if (!br_promisc_port(p))
178 dev_uc_del(p->dev, addr);
182 /* When a static FDB entry is deleted, the HW address from that entry is
183 * also removed from the bridge private HW address list and updates all
184 * the ports with needed information.
187 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
189 struct net_bridge_port *p;
193 list_for_each_entry(p, &br->port_list, list) {
194 if (!br_promisc_port(p))
195 dev_uc_del(p->dev, addr);
199 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
202 trace_fdb_delete(br, f);
205 fdb_del_hw_addr(br, f->key.addr.addr);
207 hlist_del_init_rcu(&f->fdb_node);
208 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
210 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
211 call_rcu(&f->rcu, fdb_rcu_free);
214 /* Delete a local entry if no other port had the same address. */
215 static void fdb_delete_local(struct net_bridge *br,
216 const struct net_bridge_port *p,
217 struct net_bridge_fdb_entry *f)
219 const unsigned char *addr = f->key.addr.addr;
220 struct net_bridge_vlan_group *vg;
221 const struct net_bridge_vlan *v;
222 struct net_bridge_port *op;
223 u16 vid = f->key.vlan_id;
225 /* Maybe another port has same hw addr? */
226 list_for_each_entry(op, &br->port_list, list) {
227 vg = nbp_vlan_group(op);
228 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
229 (!vid || br_vlan_find(vg, vid))) {
231 f->added_by_user = 0;
236 vg = br_vlan_group(br);
237 v = br_vlan_find(vg, vid);
238 /* Maybe bridge device has same hw addr? */
239 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
240 (!vid || (v && br_vlan_should_use(v)))) {
242 f->added_by_user = 0;
246 fdb_delete(br, f, true);
249 void br_fdb_find_delete_local(struct net_bridge *br,
250 const struct net_bridge_port *p,
251 const unsigned char *addr, u16 vid)
253 struct net_bridge_fdb_entry *f;
255 spin_lock_bh(&br->hash_lock);
256 f = br_fdb_find(br, addr, vid);
257 if (f && f->is_local && !f->added_by_user && f->dst == p)
258 fdb_delete_local(br, p, f);
259 spin_unlock_bh(&br->hash_lock);
262 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
264 struct net_bridge_vlan_group *vg;
265 struct net_bridge_fdb_entry *f;
266 struct net_bridge *br = p->br;
267 struct net_bridge_vlan *v;
269 spin_lock_bh(&br->hash_lock);
270 vg = nbp_vlan_group(p);
271 hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
272 if (f->dst == p && f->is_local && !f->added_by_user) {
274 fdb_delete_local(br, p, f);
276 /* if this port has no vlan information
277 * configured, we can safely be done at
280 if (!vg || !vg->num_vlans)
286 /* insert new address, may fail if invalid address or dup. */
287 fdb_insert(br, p, newaddr, 0);
289 if (!vg || !vg->num_vlans)
292 /* Now add entries for every VLAN configured on the port.
293 * This function runs under RTNL so the bitmap will not change
296 list_for_each_entry(v, &vg->vlan_list, vlist)
297 fdb_insert(br, p, newaddr, v->vid);
300 spin_unlock_bh(&br->hash_lock);
303 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
305 struct net_bridge_vlan_group *vg;
306 struct net_bridge_fdb_entry *f;
307 struct net_bridge_vlan *v;
309 spin_lock_bh(&br->hash_lock);
311 /* If old entry was unassociated with any port, then delete it. */
312 f = br_fdb_find(br, br->dev->dev_addr, 0);
313 if (f && f->is_local && !f->dst && !f->added_by_user)
314 fdb_delete_local(br, NULL, f);
316 fdb_insert(br, NULL, newaddr, 0);
317 vg = br_vlan_group(br);
318 if (!vg || !vg->num_vlans)
320 /* Now remove and add entries for every VLAN configured on the
321 * bridge. This function runs under RTNL so the bitmap will not
322 * change from under us.
324 list_for_each_entry(v, &vg->vlan_list, vlist) {
325 if (!br_vlan_should_use(v))
327 f = br_fdb_find(br, br->dev->dev_addr, v->vid);
328 if (f && f->is_local && !f->dst && !f->added_by_user)
329 fdb_delete_local(br, NULL, f);
330 fdb_insert(br, NULL, newaddr, v->vid);
333 spin_unlock_bh(&br->hash_lock);
336 void br_fdb_cleanup(struct work_struct *work)
338 struct net_bridge *br = container_of(work, struct net_bridge,
340 struct net_bridge_fdb_entry *f = NULL;
341 unsigned long delay = hold_time(br);
342 unsigned long work_delay = delay;
343 unsigned long now = jiffies;
345 /* this part is tricky, in order to avoid blocking learning and
346 * consequently forwarding, we rely on rcu to delete objects with
347 * delayed freeing allowing us to continue traversing
350 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
351 unsigned long this_timer;
353 if (f->is_static || f->added_by_external_learn)
355 this_timer = f->updated + delay;
356 if (time_after(this_timer, now)) {
357 work_delay = min(work_delay, this_timer - now);
359 spin_lock_bh(&br->hash_lock);
360 if (!hlist_unhashed(&f->fdb_node))
361 fdb_delete(br, f, true);
362 spin_unlock_bh(&br->hash_lock);
367 /* Cleanup minimum 10 milliseconds apart */
368 work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
369 mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
372 /* Completely flush all dynamic entries in forwarding database.*/
373 void br_fdb_flush(struct net_bridge *br)
375 struct net_bridge_fdb_entry *f;
376 struct hlist_node *tmp;
378 spin_lock_bh(&br->hash_lock);
379 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
381 fdb_delete(br, f, true);
383 spin_unlock_bh(&br->hash_lock);
386 /* Flush all entries referring to a specific port.
387 * if do_all is set also flush static entries
388 * if vid is set delete all entries that match the vlan_id
390 void br_fdb_delete_by_port(struct net_bridge *br,
391 const struct net_bridge_port *p,
395 struct net_bridge_fdb_entry *f;
396 struct hlist_node *tmp;
398 spin_lock_bh(&br->hash_lock);
399 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
404 if (f->is_static || (vid && f->key.vlan_id != vid))
408 fdb_delete_local(br, p, f);
410 fdb_delete(br, f, true);
412 spin_unlock_bh(&br->hash_lock);
415 #if IS_ENABLED(CONFIG_ATM_LANE)
416 /* Interface used by ATM LANE hook to test
417 * if an addr is on some other bridge port */
418 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
420 struct net_bridge_fdb_entry *fdb;
421 struct net_bridge_port *port;
425 port = br_port_get_rcu(dev);
429 fdb = br_fdb_find_rcu(port->br, addr, 0);
430 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
431 fdb->dst->state == BR_STATE_FORWARDING;
437 #endif /* CONFIG_ATM_LANE */
440 * Fill buffer with forwarding table records in
443 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
444 unsigned long maxnum, unsigned long skip)
446 struct net_bridge_fdb_entry *f;
447 struct __fdb_entry *fe = buf;
450 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
453 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
457 if (has_expired(br, f))
460 /* ignore pseudo entry for local MAC address */
469 /* convert from internal format to API */
470 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
472 /* due to ABI compat need to split into hi/lo */
473 fe->port_no = f->dst->port_no;
474 fe->port_hi = f->dst->port_no >> 8;
476 fe->is_local = f->is_local;
478 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
487 static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
488 struct net_bridge_port *source,
489 const unsigned char *addr,
491 unsigned char is_local,
492 unsigned char is_static)
494 struct net_bridge_fdb_entry *fdb;
496 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
498 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
500 fdb->key.vlan_id = vid;
501 fdb->is_local = is_local;
502 fdb->is_static = is_static;
503 fdb->added_by_user = 0;
504 fdb->added_by_external_learn = 0;
507 fdb->updated = fdb->used = jiffies;
508 if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
510 br_fdb_rht_params)) {
511 kmem_cache_free(br_fdb_cache, fdb);
514 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
520 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
521 const unsigned char *addr, u16 vid)
523 struct net_bridge_fdb_entry *fdb;
525 if (!is_valid_ether_addr(addr))
528 fdb = br_fdb_find(br, addr, vid);
530 /* it is okay to have multiple ports with same
531 * address, just use the first one.
535 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
536 source ? source->dev->name : br->dev->name, addr, vid);
537 fdb_delete(br, fdb, true);
540 fdb = fdb_create(br, source, addr, vid, 1, 1);
544 fdb_add_hw_addr(br, addr);
545 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
549 /* Add entry for local address of interface */
550 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
551 const unsigned char *addr, u16 vid)
555 spin_lock_bh(&br->hash_lock);
556 ret = fdb_insert(br, source, addr, vid);
557 spin_unlock_bh(&br->hash_lock);
561 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
562 const unsigned char *addr, u16 vid, bool added_by_user)
564 struct net_bridge_fdb_entry *fdb;
565 bool fdb_modified = false;
567 /* some users want to always flood. */
568 if (hold_time(br) == 0)
571 /* ignore packets unless we are using this port */
572 if (!(source->state == BR_STATE_LEARNING ||
573 source->state == BR_STATE_FORWARDING))
576 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
578 /* attempt to update an entry for a local interface */
579 if (unlikely(fdb->is_local)) {
581 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
582 source->dev->name, addr, vid);
584 unsigned long now = jiffies;
586 /* fastpath: update of existing entry */
587 if (unlikely(source != fdb->dst && !fdb->is_sticky)) {
590 /* Take over HW learned entry */
591 if (unlikely(fdb->added_by_external_learn))
592 fdb->added_by_external_learn = 0;
594 if (now != fdb->updated)
596 if (unlikely(added_by_user))
597 fdb->added_by_user = 1;
598 if (unlikely(fdb_modified)) {
599 trace_br_fdb_update(br, source, addr, vid, added_by_user);
600 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
604 spin_lock(&br->hash_lock);
605 fdb = fdb_create(br, source, addr, vid, 0, 0);
607 if (unlikely(added_by_user))
608 fdb->added_by_user = 1;
609 trace_br_fdb_update(br, source, addr, vid,
611 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
613 /* else we lose race and someone else inserts
614 * it first, don't bother updating
616 spin_unlock(&br->hash_lock);
620 static int fdb_to_nud(const struct net_bridge *br,
621 const struct net_bridge_fdb_entry *fdb)
624 return NUD_PERMANENT;
625 else if (fdb->is_static)
627 else if (has_expired(br, fdb))
630 return NUD_REACHABLE;
633 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
634 const struct net_bridge_fdb_entry *fdb,
635 u32 portid, u32 seq, int type, unsigned int flags)
637 unsigned long now = jiffies;
638 struct nda_cacheinfo ci;
639 struct nlmsghdr *nlh;
642 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
646 ndm = nlmsg_data(nlh);
647 ndm->ndm_family = AF_BRIDGE;
652 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
653 ndm->ndm_state = fdb_to_nud(br, fdb);
656 ndm->ndm_flags |= NTF_OFFLOADED;
657 if (fdb->added_by_external_learn)
658 ndm->ndm_flags |= NTF_EXT_LEARNED;
660 ndm->ndm_flags |= NTF_STICKY;
662 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
663 goto nla_put_failure;
664 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
665 goto nla_put_failure;
666 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
667 ci.ndm_confirmed = 0;
668 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
670 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
671 goto nla_put_failure;
673 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
675 goto nla_put_failure;
681 nlmsg_cancel(skb, nlh);
685 static inline size_t fdb_nlmsg_size(void)
687 return NLMSG_ALIGN(sizeof(struct ndmsg))
688 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
689 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
690 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
691 + nla_total_size(sizeof(struct nda_cacheinfo));
694 static void fdb_notify(struct net_bridge *br,
695 const struct net_bridge_fdb_entry *fdb, int type,
698 struct net *net = dev_net(br->dev);
703 br_switchdev_fdb_notify(fdb, type);
705 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
709 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
711 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
712 WARN_ON(err == -EMSGSIZE);
716 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
719 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
722 /* Dump information about entries, in response to GETNEIGH */
723 int br_fdb_dump(struct sk_buff *skb,
724 struct netlink_callback *cb,
725 struct net_device *dev,
726 struct net_device *filter_dev,
729 struct net_bridge *br = netdev_priv(dev);
730 struct net_bridge_fdb_entry *f;
733 if (!(dev->priv_flags & IFF_EBRIDGE))
737 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
743 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
744 if (*idx < cb->args[2])
746 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
747 if (filter_dev != dev)
749 /* !f->dst is a special case for bridge
750 * It means the MAC belongs to the bridge
751 * Therefore need a little more filtering
752 * we only want to dump the !f->dst case
757 if (!filter_dev && f->dst)
760 err = fdb_fill_info(skb, br, f,
761 NETLINK_CB(cb->skb).portid,
775 int br_fdb_get(struct sk_buff *skb,
777 struct net_device *dev,
778 const unsigned char *addr,
779 u16 vid, u32 portid, u32 seq,
780 struct netlink_ext_ack *extack)
782 struct net_bridge *br = netdev_priv(dev);
783 struct net_bridge_fdb_entry *f;
787 f = br_fdb_find_rcu(br, addr, vid);
789 NL_SET_ERR_MSG(extack, "Fdb entry not found");
794 err = fdb_fill_info(skb, br, f, portid, seq,
801 /* Update (create or replace) forwarding database entry */
802 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
803 const u8 *addr, u16 state, u16 flags, u16 vid,
806 u8 is_sticky = !!(ndm_flags & NTF_STICKY);
807 struct net_bridge_fdb_entry *fdb;
808 bool modified = false;
810 /* If the port cannot learn allow only local and static entries */
811 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
812 !(source->state == BR_STATE_LEARNING ||
813 source->state == BR_STATE_FORWARDING))
816 if (!source && !(state & NUD_PERMANENT)) {
817 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
822 if (is_sticky && (state & NUD_PERMANENT))
825 fdb = br_fdb_find(br, addr, vid);
827 if (!(flags & NLM_F_CREATE))
830 fdb = fdb_create(br, source, addr, vid, 0, 0);
836 if (flags & NLM_F_EXCL)
839 if (fdb->dst != source) {
845 if (fdb_to_nud(br, fdb) != state) {
846 if (state & NUD_PERMANENT) {
848 if (!fdb->is_static) {
850 fdb_add_hw_addr(br, addr);
852 } else if (state & NUD_NOARP) {
854 if (!fdb->is_static) {
856 fdb_add_hw_addr(br, addr);
860 if (fdb->is_static) {
862 fdb_del_hw_addr(br, addr);
869 if (is_sticky != fdb->is_sticky) {
870 fdb->is_sticky = is_sticky;
874 fdb->added_by_user = 1;
878 fdb->updated = jiffies;
879 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
885 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
886 struct net_bridge_port *p, const unsigned char *addr,
887 u16 nlh_flags, u16 vid)
891 if (ndm->ndm_flags & NTF_USE) {
893 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
899 br_fdb_update(br, p, addr, vid, true);
902 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
903 err = br_fdb_external_learn_add(br, p, addr, vid, true);
905 spin_lock_bh(&br->hash_lock);
906 err = fdb_add_entry(br, p, addr, ndm->ndm_state,
907 nlh_flags, vid, ndm->ndm_flags);
908 spin_unlock_bh(&br->hash_lock);
914 /* Add new permanent fdb entry with RTM_NEWNEIGH */
915 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
916 struct net_device *dev,
917 const unsigned char *addr, u16 vid, u16 nlh_flags,
918 struct netlink_ext_ack *extack)
920 struct net_bridge_vlan_group *vg;
921 struct net_bridge_port *p = NULL;
922 struct net_bridge_vlan *v;
923 struct net_bridge *br = NULL;
926 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
928 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
929 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
933 if (is_zero_ether_addr(addr)) {
934 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
938 if (dev->priv_flags & IFF_EBRIDGE) {
939 br = netdev_priv(dev);
940 vg = br_vlan_group(br);
942 p = br_port_get_rtnl(dev);
944 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
949 vg = nbp_vlan_group(p);
953 v = br_vlan_find(vg, vid);
954 if (!v || !br_vlan_should_use(v)) {
955 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
959 /* VID was specified, so use it. */
960 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
962 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
963 if (err || !vg || !vg->num_vlans)
966 /* We have vlans configured on this port and user didn't
967 * specify a VLAN. To be nice, add/update entry for every
970 list_for_each_entry(v, &vg->vlan_list, vlist) {
971 if (!br_vlan_should_use(v))
973 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
983 static int fdb_delete_by_addr_and_port(struct net_bridge *br,
984 const struct net_bridge_port *p,
985 const u8 *addr, u16 vlan)
987 struct net_bridge_fdb_entry *fdb;
989 fdb = br_fdb_find(br, addr, vlan);
990 if (!fdb || fdb->dst != p)
993 fdb_delete(br, fdb, true);
998 static int __br_fdb_delete(struct net_bridge *br,
999 const struct net_bridge_port *p,
1000 const unsigned char *addr, u16 vid)
1004 spin_lock_bh(&br->hash_lock);
1005 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1006 spin_unlock_bh(&br->hash_lock);
1011 /* Remove neighbor entry with RTM_DELNEIGH */
1012 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1013 struct net_device *dev,
1014 const unsigned char *addr, u16 vid)
1016 struct net_bridge_vlan_group *vg;
1017 struct net_bridge_port *p = NULL;
1018 struct net_bridge_vlan *v;
1019 struct net_bridge *br;
1022 if (dev->priv_flags & IFF_EBRIDGE) {
1023 br = netdev_priv(dev);
1024 vg = br_vlan_group(br);
1026 p = br_port_get_rtnl(dev);
1028 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1032 vg = nbp_vlan_group(p);
1037 v = br_vlan_find(vg, vid);
1039 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1043 err = __br_fdb_delete(br, p, addr, vid);
1046 err &= __br_fdb_delete(br, p, addr, 0);
1047 if (!vg || !vg->num_vlans)
1050 list_for_each_entry(v, &vg->vlan_list, vlist) {
1051 if (!br_vlan_should_use(v))
1053 err &= __br_fdb_delete(br, p, addr, v->vid);
1060 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1062 struct net_bridge_fdb_entry *f, *tmp;
1067 /* the key here is that static entries change only under rtnl */
1069 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1070 /* We only care for static entries */
1073 err = dev_uc_add(p->dev, f->key.addr.addr);
1083 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1084 /* We only care for static entries */
1085 if (!tmp->is_static)
1089 dev_uc_del(p->dev, tmp->key.addr.addr);
1095 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1097 struct net_bridge_fdb_entry *f;
1102 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1103 /* We only care for static entries */
1107 dev_uc_del(p->dev, f->key.addr.addr);
1112 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1113 const unsigned char *addr, u16 vid,
1116 struct net_bridge_fdb_entry *fdb;
1117 bool modified = false;
1120 trace_br_fdb_external_learn_add(br, p, addr, vid);
1122 spin_lock_bh(&br->hash_lock);
1124 fdb = br_fdb_find(br, addr, vid);
1126 fdb = fdb_create(br, p, addr, vid, 0, 0);
1132 fdb->added_by_user = 1;
1133 fdb->added_by_external_learn = 1;
1134 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1136 fdb->updated = jiffies;
1138 if (fdb->dst != p) {
1143 if (fdb->added_by_external_learn) {
1145 fdb->used = jiffies;
1146 } else if (!fdb->added_by_user) {
1147 /* Take over SW learned entry */
1148 fdb->added_by_external_learn = 1;
1153 fdb->added_by_user = 1;
1156 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1160 spin_unlock_bh(&br->hash_lock);
1165 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1166 const unsigned char *addr, u16 vid,
1169 struct net_bridge_fdb_entry *fdb;
1172 spin_lock_bh(&br->hash_lock);
1174 fdb = br_fdb_find(br, addr, vid);
1175 if (fdb && fdb->added_by_external_learn)
1176 fdb_delete(br, fdb, swdev_notify);
1180 spin_unlock_bh(&br->hash_lock);
1185 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1186 const unsigned char *addr, u16 vid, bool offloaded)
1188 struct net_bridge_fdb_entry *fdb;
1190 spin_lock_bh(&br->hash_lock);
1192 fdb = br_fdb_find(br, addr, vid);
1194 fdb->offloaded = offloaded;
1196 spin_unlock_bh(&br->hash_lock);
1199 void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1201 struct net_bridge_fdb_entry *f;
1202 struct net_bridge_port *p;
1206 p = br_port_get_rtnl(dev);
1210 spin_lock_bh(&p->br->hash_lock);
1211 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1212 if (f->dst == p && f->key.vlan_id == vid)
1215 spin_unlock_bh(&p->br->hash_lock);
1217 EXPORT_SYMBOL_GPL(br_fdb_clear_offload);