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 "br_private.h"
30 static struct kmem_cache *br_fdb_cache __read_mostly;
31 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
32 const unsigned char *addr,
34 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
35 const unsigned char *addr, u16 vid);
36 static void fdb_notify(struct net_bridge *br,
37 const struct net_bridge_fdb_entry *, int);
39 static u32 fdb_salt __read_mostly;
41 int __init br_fdb_init(void)
43 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
44 sizeof(struct net_bridge_fdb_entry),
46 SLAB_HWCACHE_ALIGN, NULL);
50 get_random_bytes(&fdb_salt, sizeof(fdb_salt));
54 void br_fdb_fini(void)
56 kmem_cache_destroy(br_fdb_cache);
60 /* if topology_changing then use forward_delay (default 15 sec)
61 * otherwise keep longer (default 5 minutes)
63 static inline unsigned long hold_time(const struct net_bridge *br)
65 return br->topology_change ? br->forward_delay : br->ageing_time;
68 static inline int has_expired(const struct net_bridge *br,
69 const struct net_bridge_fdb_entry *fdb)
71 return !fdb->is_static &&
72 time_before_eq(fdb->updated + hold_time(br), jiffies);
75 static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
77 /* use 1 byte of OUI and 3 bytes of NIC */
78 u32 key = get_unaligned((u32 *)(mac + 2));
79 return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
82 static void fdb_rcu_free(struct rcu_head *head)
84 struct net_bridge_fdb_entry *ent
85 = container_of(head, struct net_bridge_fdb_entry, rcu);
86 kmem_cache_free(br_fdb_cache, ent);
89 /* When a static FDB entry is added, the mac address from the entry is
90 * added to the bridge private HW address list and all required ports
91 * are then updated with the new information.
94 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
97 struct net_bridge_port *p;
101 list_for_each_entry(p, &br->port_list, list) {
102 if (!br_promisc_port(p)) {
103 err = dev_uc_add(p->dev, addr);
111 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
112 if (!br_promisc_port(p))
113 dev_uc_del(p->dev, addr);
117 /* When a static FDB entry is deleted, the HW address from that entry is
118 * also removed from the bridge private HW address list and updates all
119 * the ports with needed information.
122 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
124 struct net_bridge_port *p;
128 list_for_each_entry(p, &br->port_list, list) {
129 if (!br_promisc_port(p))
130 dev_uc_del(p->dev, addr);
134 static void fdb_del_external_learn(struct net_bridge_fdb_entry *f)
136 struct switchdev_obj_port_fdb fdb = {
138 .orig_dev = f->dst->dev,
139 .id = SWITCHDEV_OBJ_ID_PORT_FDB,
140 .flags = SWITCHDEV_F_DEFER,
145 ether_addr_copy(fdb.addr, f->addr.addr);
146 switchdev_port_obj_del(f->dst->dev, &fdb.obj);
149 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
152 fdb_del_hw_addr(br, f->addr.addr);
154 if (f->added_by_external_learn)
155 fdb_del_external_learn(f);
157 hlist_del_rcu(&f->hlist);
158 fdb_notify(br, f, RTM_DELNEIGH);
159 call_rcu(&f->rcu, fdb_rcu_free);
162 /* Delete a local entry if no other port had the same address. */
163 static void fdb_delete_local(struct net_bridge *br,
164 const struct net_bridge_port *p,
165 struct net_bridge_fdb_entry *f)
167 const unsigned char *addr = f->addr.addr;
168 struct net_bridge_vlan_group *vg;
169 const struct net_bridge_vlan *v;
170 struct net_bridge_port *op;
171 u16 vid = f->vlan_id;
173 /* Maybe another port has same hw addr? */
174 list_for_each_entry(op, &br->port_list, list) {
175 vg = nbp_vlan_group(op);
176 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
177 (!vid || br_vlan_find(vg, vid))) {
179 f->added_by_user = 0;
184 vg = br_vlan_group(br);
185 v = br_vlan_find(vg, vid);
186 /* Maybe bridge device has same hw addr? */
187 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
188 (!vid || (v && br_vlan_should_use(v)))) {
190 f->added_by_user = 0;
197 void br_fdb_find_delete_local(struct net_bridge *br,
198 const struct net_bridge_port *p,
199 const unsigned char *addr, u16 vid)
201 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
202 struct net_bridge_fdb_entry *f;
204 spin_lock_bh(&br->hash_lock);
205 f = fdb_find(head, addr, vid);
206 if (f && f->is_local && !f->added_by_user && f->dst == p)
207 fdb_delete_local(br, p, f);
208 spin_unlock_bh(&br->hash_lock);
211 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
213 struct net_bridge_vlan_group *vg;
214 struct net_bridge *br = p->br;
215 struct net_bridge_vlan *v;
218 spin_lock_bh(&br->hash_lock);
220 vg = nbp_vlan_group(p);
221 /* Search all chains since old address/hash is unknown */
222 for (i = 0; i < BR_HASH_SIZE; i++) {
223 struct hlist_node *h;
224 hlist_for_each(h, &br->hash[i]) {
225 struct net_bridge_fdb_entry *f;
227 f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
228 if (f->dst == p && f->is_local && !f->added_by_user) {
230 fdb_delete_local(br, p, f);
232 /* if this port has no vlan information
233 * configured, we can safely be done at
236 if (!vg || !vg->num_vlans)
243 /* insert new address, may fail if invalid address or dup. */
244 fdb_insert(br, p, newaddr, 0);
246 if (!vg || !vg->num_vlans)
249 /* Now add entries for every VLAN configured on the port.
250 * This function runs under RTNL so the bitmap will not change
253 list_for_each_entry(v, &vg->vlan_list, vlist)
254 fdb_insert(br, p, newaddr, v->vid);
257 spin_unlock_bh(&br->hash_lock);
260 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
262 struct net_bridge_vlan_group *vg;
263 struct net_bridge_fdb_entry *f;
264 struct net_bridge_vlan *v;
266 spin_lock_bh(&br->hash_lock);
268 /* If old entry was unassociated with any port, then delete it. */
269 f = __br_fdb_get(br, br->dev->dev_addr, 0);
270 if (f && f->is_local && !f->dst)
271 fdb_delete_local(br, NULL, f);
273 fdb_insert(br, NULL, newaddr, 0);
274 vg = br_vlan_group(br);
275 if (!vg || !vg->num_vlans)
277 /* Now remove and add entries for every VLAN configured on the
278 * bridge. This function runs under RTNL so the bitmap will not
279 * change from under us.
281 list_for_each_entry(v, &vg->vlan_list, vlist) {
282 f = __br_fdb_get(br, br->dev->dev_addr, v->vid);
283 if (f && f->is_local && !f->dst)
284 fdb_delete_local(br, NULL, f);
285 fdb_insert(br, NULL, newaddr, v->vid);
288 spin_unlock_bh(&br->hash_lock);
291 void br_fdb_cleanup(unsigned long _data)
293 struct net_bridge *br = (struct net_bridge *)_data;
294 unsigned long delay = hold_time(br);
295 unsigned long next_timer = jiffies + br->ageing_time;
298 spin_lock(&br->hash_lock);
299 for (i = 0; i < BR_HASH_SIZE; i++) {
300 struct net_bridge_fdb_entry *f;
301 struct hlist_node *n;
303 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
304 unsigned long this_timer;
307 if (f->added_by_external_learn)
309 this_timer = f->updated + delay;
310 if (time_before_eq(this_timer, jiffies))
312 else if (time_before(this_timer, next_timer))
313 next_timer = this_timer;
316 spin_unlock(&br->hash_lock);
318 mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
321 /* Completely flush all dynamic entries in forwarding database.*/
322 void br_fdb_flush(struct net_bridge *br)
326 spin_lock_bh(&br->hash_lock);
327 for (i = 0; i < BR_HASH_SIZE; i++) {
328 struct net_bridge_fdb_entry *f;
329 struct hlist_node *n;
330 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
335 spin_unlock_bh(&br->hash_lock);
338 /* Flush all entries referring to a specific port.
339 * if do_all is set also flush static entries
340 * if vid is set delete all entries that match the vlan_id
342 void br_fdb_delete_by_port(struct net_bridge *br,
343 const struct net_bridge_port *p,
349 spin_lock_bh(&br->hash_lock);
350 for (i = 0; i < BR_HASH_SIZE; i++) {
351 struct hlist_node *h, *g;
353 hlist_for_each_safe(h, g, &br->hash[i]) {
354 struct net_bridge_fdb_entry *f
355 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
360 if (f->is_static || (vid && f->vlan_id != vid))
364 fdb_delete_local(br, p, f);
369 spin_unlock_bh(&br->hash_lock);
372 /* No locking or refcounting, assumes caller has rcu_read_lock */
373 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
374 const unsigned char *addr,
377 struct net_bridge_fdb_entry *fdb;
379 hlist_for_each_entry_rcu(fdb,
380 &br->hash[br_mac_hash(addr, vid)], hlist) {
381 if (ether_addr_equal(fdb->addr.addr, addr) &&
382 fdb->vlan_id == vid) {
383 if (unlikely(has_expired(br, fdb)))
392 #if IS_ENABLED(CONFIG_ATM_LANE)
393 /* Interface used by ATM LANE hook to test
394 * if an addr is on some other bridge port */
395 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
397 struct net_bridge_fdb_entry *fdb;
398 struct net_bridge_port *port;
402 port = br_port_get_rcu(dev);
406 fdb = __br_fdb_get(port->br, addr, 0);
407 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
408 fdb->dst->state == BR_STATE_FORWARDING;
414 #endif /* CONFIG_ATM_LANE */
417 * Fill buffer with forwarding table records in
420 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
421 unsigned long maxnum, unsigned long skip)
423 struct __fdb_entry *fe = buf;
425 struct net_bridge_fdb_entry *f;
427 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
430 for (i = 0; i < BR_HASH_SIZE; i++) {
431 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
435 if (has_expired(br, f))
438 /* ignore pseudo entry for local MAC address */
447 /* convert from internal format to API */
448 memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
450 /* due to ABI compat need to split into hi/lo */
451 fe->port_no = f->dst->port_no;
452 fe->port_hi = f->dst->port_no >> 8;
454 fe->is_local = f->is_local;
456 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
468 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
469 const unsigned char *addr,
472 struct net_bridge_fdb_entry *fdb;
474 hlist_for_each_entry(fdb, head, hlist) {
475 if (ether_addr_equal(fdb->addr.addr, addr) &&
482 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
483 const unsigned char *addr,
486 struct net_bridge_fdb_entry *fdb;
488 hlist_for_each_entry_rcu(fdb, head, hlist) {
489 if (ether_addr_equal(fdb->addr.addr, addr) &&
496 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
497 struct net_bridge_port *source,
498 const unsigned char *addr,
500 unsigned char is_local,
501 unsigned char is_static)
503 struct net_bridge_fdb_entry *fdb;
505 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
507 memcpy(fdb->addr.addr, addr, ETH_ALEN);
510 fdb->is_local = is_local;
511 fdb->is_static = is_static;
512 fdb->added_by_user = 0;
513 fdb->added_by_external_learn = 0;
514 fdb->updated = fdb->used = jiffies;
515 hlist_add_head_rcu(&fdb->hlist, head);
520 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
521 const unsigned char *addr, u16 vid)
523 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
524 struct net_bridge_fdb_entry *fdb;
526 if (!is_valid_ether_addr(addr))
529 fdb = fdb_find(head, 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 "
537 "as a received packet\n",
538 source ? source->dev->name : br->dev->name);
542 fdb = fdb_create(head, source, addr, vid, 1, 1);
546 fdb_add_hw_addr(br, addr);
547 fdb_notify(br, fdb, RTM_NEWNEIGH);
551 /* Add entry for local address of interface */
552 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
553 const unsigned char *addr, u16 vid)
557 spin_lock_bh(&br->hash_lock);
558 ret = fdb_insert(br, source, addr, vid);
559 spin_unlock_bh(&br->hash_lock);
563 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
564 const unsigned char *addr, u16 vid, bool added_by_user)
566 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
567 struct net_bridge_fdb_entry *fdb;
568 bool fdb_modified = false;
570 /* some users want to always flood. */
571 if (hold_time(br) == 0)
574 /* ignore packets unless we are using this port */
575 if (!(source->state == BR_STATE_LEARNING ||
576 source->state == BR_STATE_FORWARDING))
579 fdb = fdb_find_rcu(head, addr, vid);
581 /* attempt to update an entry for a local interface */
582 if (unlikely(fdb->is_local)) {
584 br_warn(br, "received packet on %s with "
585 "own address as source address\n",
588 /* fastpath: update of existing entry */
589 if (unlikely(source != fdb->dst)) {
593 fdb->updated = jiffies;
594 if (unlikely(added_by_user))
595 fdb->added_by_user = 1;
596 if (unlikely(fdb_modified))
597 fdb_notify(br, fdb, RTM_NEWNEIGH);
600 spin_lock(&br->hash_lock);
601 if (likely(!fdb_find(head, addr, vid))) {
602 fdb = fdb_create(head, source, addr, vid, 0, 0);
604 if (unlikely(added_by_user))
605 fdb->added_by_user = 1;
606 fdb_notify(br, fdb, RTM_NEWNEIGH);
609 /* else we lose race and someone else inserts
610 * it first, don't bother updating
612 spin_unlock(&br->hash_lock);
616 static int fdb_to_nud(const struct net_bridge *br,
617 const struct net_bridge_fdb_entry *fdb)
620 return NUD_PERMANENT;
621 else if (fdb->is_static)
623 else if (has_expired(br, fdb))
626 return NUD_REACHABLE;
629 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
630 const struct net_bridge_fdb_entry *fdb,
631 u32 portid, u32 seq, int type, unsigned int flags)
633 unsigned long now = jiffies;
634 struct nda_cacheinfo ci;
635 struct nlmsghdr *nlh;
638 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
642 ndm = nlmsg_data(nlh);
643 ndm->ndm_family = AF_BRIDGE;
646 ndm->ndm_flags = fdb->added_by_external_learn ? NTF_EXT_LEARNED : 0;
648 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
649 ndm->ndm_state = fdb_to_nud(br, fdb);
651 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
652 goto nla_put_failure;
653 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
654 goto nla_put_failure;
655 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
656 ci.ndm_confirmed = 0;
657 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
659 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
660 goto nla_put_failure;
662 if (fdb->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
663 goto nla_put_failure;
669 nlmsg_cancel(skb, nlh);
673 static inline size_t fdb_nlmsg_size(void)
675 return NLMSG_ALIGN(sizeof(struct ndmsg))
676 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
677 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
678 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
679 + nla_total_size(sizeof(struct nda_cacheinfo));
682 static void fdb_notify(struct net_bridge *br,
683 const struct net_bridge_fdb_entry *fdb, int type)
685 struct net *net = dev_net(br->dev);
689 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
693 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
695 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
696 WARN_ON(err == -EMSGSIZE);
700 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
703 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
706 /* Dump information about entries, in response to GETNEIGH */
707 int br_fdb_dump(struct sk_buff *skb,
708 struct netlink_callback *cb,
709 struct net_device *dev,
710 struct net_device *filter_dev,
713 struct net_bridge *br = netdev_priv(dev);
716 if (!(dev->priv_flags & IFF_EBRIDGE))
720 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
722 for (i = 0; i < BR_HASH_SIZE; i++) {
723 struct net_bridge_fdb_entry *f;
725 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
728 if (idx < cb->args[0])
732 (!f->dst || f->dst->dev != filter_dev)) {
733 if (filter_dev != dev)
735 /* !f->dst is a special case for bridge
736 * It means the MAC belongs to the bridge
737 * Therefore need a little more filtering
738 * we only want to dump the !f->dst case
743 if (!filter_dev && f->dst)
746 err = fdb_fill_info(skb, br, f,
747 NETLINK_CB(cb->skb).portid,
764 /* Update (create or replace) forwarding database entry */
765 static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
766 __u16 state, __u16 flags, __u16 vid)
768 struct net_bridge *br = source->br;
769 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
770 struct net_bridge_fdb_entry *fdb;
771 bool modified = false;
773 /* If the port cannot learn allow only local and static entries */
774 if (!(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
775 !(source->state == BR_STATE_LEARNING ||
776 source->state == BR_STATE_FORWARDING))
779 fdb = fdb_find(head, addr, vid);
781 if (!(flags & NLM_F_CREATE))
784 fdb = fdb_create(head, source, addr, vid, 0, 0);
790 if (flags & NLM_F_EXCL)
793 if (fdb->dst != source) {
799 if (fdb_to_nud(br, fdb) != state) {
800 if (state & NUD_PERMANENT) {
802 if (!fdb->is_static) {
804 fdb_add_hw_addr(br, addr);
806 } else if (state & NUD_NOARP) {
808 if (!fdb->is_static) {
810 fdb_add_hw_addr(br, addr);
814 if (fdb->is_static) {
816 fdb_del_hw_addr(br, addr);
822 fdb->added_by_user = 1;
826 fdb->updated = jiffies;
827 fdb_notify(br, fdb, RTM_NEWNEIGH);
833 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge_port *p,
834 const unsigned char *addr, u16 nlh_flags, u16 vid)
838 if (ndm->ndm_flags & NTF_USE) {
841 br_fdb_update(p->br, p, addr, vid, true);
845 spin_lock_bh(&p->br->hash_lock);
846 err = fdb_add_entry(p, addr, ndm->ndm_state,
848 spin_unlock_bh(&p->br->hash_lock);
854 /* Add new permanent fdb entry with RTM_NEWNEIGH */
855 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
856 struct net_device *dev,
857 const unsigned char *addr, u16 vid, u16 nlh_flags)
859 struct net_bridge_vlan_group *vg;
860 struct net_bridge_port *p = NULL;
861 struct net_bridge_vlan *v;
862 struct net_bridge *br = NULL;
865 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
866 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
870 if (is_zero_ether_addr(addr)) {
871 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
875 if (dev->priv_flags & IFF_EBRIDGE) {
876 br = netdev_priv(dev);
877 vg = br_vlan_group(br);
879 p = br_port_get_rtnl(dev);
881 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
885 vg = nbp_vlan_group(p);
889 v = br_vlan_find(vg, vid);
890 if (!v || !br_vlan_should_use(v)) {
891 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
895 /* VID was specified, so use it. */
896 if (dev->priv_flags & IFF_EBRIDGE)
897 err = br_fdb_insert(br, NULL, addr, vid);
899 err = __br_fdb_add(ndm, p, addr, nlh_flags, vid);
901 if (dev->priv_flags & IFF_EBRIDGE)
902 err = br_fdb_insert(br, NULL, addr, 0);
904 err = __br_fdb_add(ndm, p, addr, nlh_flags, 0);
905 if (err || !vg || !vg->num_vlans)
908 /* We have vlans configured on this port and user didn't
909 * specify a VLAN. To be nice, add/update entry for every
912 list_for_each_entry(v, &vg->vlan_list, vlist) {
913 if (!br_vlan_should_use(v))
915 if (dev->priv_flags & IFF_EBRIDGE)
916 err = br_fdb_insert(br, NULL, addr, v->vid);
918 err = __br_fdb_add(ndm, p, addr, nlh_flags,
929 static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
932 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
933 struct net_bridge_fdb_entry *fdb;
935 fdb = fdb_find(head, addr, vid);
943 static int __br_fdb_delete_by_addr(struct net_bridge *br,
944 const unsigned char *addr, u16 vid)
948 spin_lock_bh(&br->hash_lock);
949 err = fdb_delete_by_addr(br, addr, vid);
950 spin_unlock_bh(&br->hash_lock);
955 static int fdb_delete_by_addr_and_port(struct net_bridge_port *p,
956 const u8 *addr, u16 vlan)
958 struct net_bridge *br = p->br;
959 struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
960 struct net_bridge_fdb_entry *fdb;
962 fdb = fdb_find(head, addr, vlan);
963 if (!fdb || fdb->dst != p)
970 static int __br_fdb_delete(struct net_bridge_port *p,
971 const unsigned char *addr, u16 vid)
975 spin_lock_bh(&p->br->hash_lock);
976 err = fdb_delete_by_addr_and_port(p, addr, vid);
977 spin_unlock_bh(&p->br->hash_lock);
982 /* Remove neighbor entry with RTM_DELNEIGH */
983 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
984 struct net_device *dev,
985 const unsigned char *addr, u16 vid)
987 struct net_bridge_vlan_group *vg;
988 struct net_bridge_port *p = NULL;
989 struct net_bridge_vlan *v;
990 struct net_bridge *br = NULL;
993 if (dev->priv_flags & IFF_EBRIDGE) {
994 br = netdev_priv(dev);
995 vg = br_vlan_group(br);
997 p = br_port_get_rtnl(dev);
999 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1003 vg = nbp_vlan_group(p);
1007 v = br_vlan_find(vg, vid);
1009 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1013 if (dev->priv_flags & IFF_EBRIDGE)
1014 err = __br_fdb_delete_by_addr(br, addr, vid);
1016 err = __br_fdb_delete(p, addr, vid);
1019 if (dev->priv_flags & IFF_EBRIDGE)
1020 err = __br_fdb_delete_by_addr(br, addr, 0);
1022 err &= __br_fdb_delete(p, addr, 0);
1024 if (!vg || !vg->num_vlans)
1027 list_for_each_entry(v, &vg->vlan_list, vlist) {
1028 if (!br_vlan_should_use(v))
1030 if (dev->priv_flags & IFF_EBRIDGE)
1031 err = __br_fdb_delete_by_addr(br, addr, v->vid);
1033 err &= __br_fdb_delete(p, addr, v->vid);
1040 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1042 struct net_bridge_fdb_entry *fdb, *tmp;
1048 for (i = 0; i < BR_HASH_SIZE; i++) {
1049 hlist_for_each_entry(fdb, &br->hash[i], hlist) {
1050 /* We only care for static entries */
1051 if (!fdb->is_static)
1054 err = dev_uc_add(p->dev, fdb->addr.addr);
1062 for (i = 0; i < BR_HASH_SIZE; i++) {
1063 hlist_for_each_entry(tmp, &br->hash[i], hlist) {
1064 /* If we reached the fdb that failed, we can stop */
1068 /* We only care for static entries */
1069 if (!tmp->is_static)
1072 dev_uc_del(p->dev, tmp->addr.addr);
1078 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1080 struct net_bridge_fdb_entry *fdb;
1085 for (i = 0; i < BR_HASH_SIZE; i++) {
1086 hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) {
1087 /* We only care for static entries */
1088 if (!fdb->is_static)
1091 dev_uc_del(p->dev, fdb->addr.addr);
1096 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1097 const unsigned char *addr, u16 vid)
1099 struct hlist_head *head;
1100 struct net_bridge_fdb_entry *fdb;
1104 spin_lock_bh(&br->hash_lock);
1106 head = &br->hash[br_mac_hash(addr, vid)];
1107 fdb = fdb_find(head, addr, vid);
1109 fdb = fdb_create(head, p, addr, vid, 0, 0);
1114 fdb->added_by_external_learn = 1;
1115 fdb_notify(br, fdb, RTM_NEWNEIGH);
1116 } else if (fdb->added_by_external_learn) {
1118 fdb->updated = fdb->used = jiffies;
1119 } else if (!fdb->added_by_user) {
1120 /* Take over SW learned entry */
1121 fdb->added_by_external_learn = 1;
1122 fdb->updated = jiffies;
1123 fdb_notify(br, fdb, RTM_NEWNEIGH);
1127 spin_unlock_bh(&br->hash_lock);
1132 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1133 const unsigned char *addr, u16 vid)
1135 struct hlist_head *head;
1136 struct net_bridge_fdb_entry *fdb;
1140 spin_lock_bh(&br->hash_lock);
1142 head = &br->hash[br_mac_hash(addr, vid)];
1143 fdb = fdb_find(head, addr, vid);
1144 if (fdb && fdb->added_by_external_learn)
1145 fdb_delete(br, fdb);
1149 spin_unlock_bh(&br->hash_lock);