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 .id = SWITCHDEV_OBJ_ID_PORT_FDB,
139 .flags = SWITCHDEV_F_DEFER,
144 ether_addr_copy(fdb.addr, f->addr.addr);
145 switchdev_port_obj_del(f->dst->dev, &fdb.obj);
148 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
151 fdb_del_hw_addr(br, f->addr.addr);
153 if (f->added_by_external_learn)
154 fdb_del_external_learn(f);
156 hlist_del_rcu(&f->hlist);
157 fdb_notify(br, f, RTM_DELNEIGH);
158 call_rcu(&f->rcu, fdb_rcu_free);
161 /* Delete a local entry if no other port had the same address. */
162 static void fdb_delete_local(struct net_bridge *br,
163 const struct net_bridge_port *p,
164 struct net_bridge_fdb_entry *f)
166 const unsigned char *addr = f->addr.addr;
167 struct net_bridge_vlan_group *vg;
168 const struct net_bridge_vlan *v;
169 struct net_bridge_port *op;
170 u16 vid = f->vlan_id;
172 /* Maybe another port has same hw addr? */
173 list_for_each_entry(op, &br->port_list, list) {
174 vg = nbp_vlan_group(op);
175 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
176 (!vid || br_vlan_find(vg, vid))) {
178 f->added_by_user = 0;
183 vg = br_vlan_group(br);
184 v = br_vlan_find(vg, vid);
185 /* Maybe bridge device has same hw addr? */
186 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
187 (!vid || (v && br_vlan_should_use(v)))) {
189 f->added_by_user = 0;
196 void br_fdb_find_delete_local(struct net_bridge *br,
197 const struct net_bridge_port *p,
198 const unsigned char *addr, u16 vid)
200 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
201 struct net_bridge_fdb_entry *f;
203 spin_lock_bh(&br->hash_lock);
204 f = fdb_find(head, addr, vid);
205 if (f && f->is_local && !f->added_by_user && f->dst == p)
206 fdb_delete_local(br, p, f);
207 spin_unlock_bh(&br->hash_lock);
210 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
212 struct net_bridge_vlan_group *vg;
213 struct net_bridge *br = p->br;
214 struct net_bridge_vlan *v;
217 spin_lock_bh(&br->hash_lock);
219 vg = nbp_vlan_group(p);
220 /* Search all chains since old address/hash is unknown */
221 for (i = 0; i < BR_HASH_SIZE; i++) {
222 struct hlist_node *h;
223 hlist_for_each(h, &br->hash[i]) {
224 struct net_bridge_fdb_entry *f;
226 f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
227 if (f->dst == p && f->is_local && !f->added_by_user) {
229 fdb_delete_local(br, p, f);
231 /* if this port has no vlan information
232 * configured, we can safely be done at
235 if (!vg || !vg->num_vlans)
242 /* insert new address, may fail if invalid address or dup. */
243 fdb_insert(br, p, newaddr, 0);
245 if (!vg || !vg->num_vlans)
248 /* Now add entries for every VLAN configured on the port.
249 * This function runs under RTNL so the bitmap will not change
252 list_for_each_entry(v, &vg->vlan_list, vlist)
253 fdb_insert(br, p, newaddr, v->vid);
256 spin_unlock_bh(&br->hash_lock);
259 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
261 struct net_bridge_vlan_group *vg;
262 struct net_bridge_fdb_entry *f;
263 struct net_bridge_vlan *v;
265 spin_lock_bh(&br->hash_lock);
267 /* If old entry was unassociated with any port, then delete it. */
268 f = __br_fdb_get(br, br->dev->dev_addr, 0);
269 if (f && f->is_local && !f->dst && !f->added_by_user)
270 fdb_delete_local(br, NULL, f);
272 fdb_insert(br, NULL, newaddr, 0);
273 vg = br_vlan_group(br);
274 if (!vg || !vg->num_vlans)
276 /* Now remove and add entries for every VLAN configured on the
277 * bridge. This function runs under RTNL so the bitmap will not
278 * change from under us.
280 list_for_each_entry(v, &vg->vlan_list, vlist) {
281 if (!br_vlan_should_use(v))
283 f = __br_fdb_get(br, br->dev->dev_addr, v->vid);
284 if (f && f->is_local && !f->dst && !f->added_by_user)
285 fdb_delete_local(br, NULL, f);
286 fdb_insert(br, NULL, newaddr, v->vid);
289 spin_unlock_bh(&br->hash_lock);
292 void br_fdb_cleanup(unsigned long _data)
294 struct net_bridge *br = (struct net_bridge *)_data;
295 unsigned long delay = hold_time(br);
296 unsigned long next_timer = jiffies + br->ageing_time;
299 spin_lock(&br->hash_lock);
300 for (i = 0; i < BR_HASH_SIZE; i++) {
301 struct net_bridge_fdb_entry *f;
302 struct hlist_node *n;
304 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
305 unsigned long this_timer;
308 if (f->added_by_external_learn)
310 this_timer = f->updated + delay;
311 if (time_before_eq(this_timer, jiffies))
313 else if (time_before(this_timer, next_timer))
314 next_timer = this_timer;
317 spin_unlock(&br->hash_lock);
319 mod_timer(&br->gc_timer, round_jiffies_up(next_timer));
322 /* Completely flush all dynamic entries in forwarding database.*/
323 void br_fdb_flush(struct net_bridge *br)
327 spin_lock_bh(&br->hash_lock);
328 for (i = 0; i < BR_HASH_SIZE; i++) {
329 struct net_bridge_fdb_entry *f;
330 struct hlist_node *n;
331 hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
336 spin_unlock_bh(&br->hash_lock);
339 /* Flush all entries referring to a specific port.
340 * if do_all is set also flush static entries
341 * if vid is set delete all entries that match the vlan_id
343 void br_fdb_delete_by_port(struct net_bridge *br,
344 const struct net_bridge_port *p,
350 spin_lock_bh(&br->hash_lock);
351 for (i = 0; i < BR_HASH_SIZE; i++) {
352 struct hlist_node *h, *g;
354 hlist_for_each_safe(h, g, &br->hash[i]) {
355 struct net_bridge_fdb_entry *f
356 = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
361 if (f->is_static || (vid && f->vlan_id != vid))
365 fdb_delete_local(br, p, f);
370 spin_unlock_bh(&br->hash_lock);
373 /* No locking or refcounting, assumes caller has rcu_read_lock */
374 struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
375 const unsigned char *addr,
378 struct net_bridge_fdb_entry *fdb;
380 hlist_for_each_entry_rcu(fdb,
381 &br->hash[br_mac_hash(addr, vid)], hlist) {
382 if (ether_addr_equal(fdb->addr.addr, addr) &&
383 fdb->vlan_id == vid) {
384 if (unlikely(has_expired(br, fdb)))
393 #if IS_ENABLED(CONFIG_ATM_LANE)
394 /* Interface used by ATM LANE hook to test
395 * if an addr is on some other bridge port */
396 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
398 struct net_bridge_fdb_entry *fdb;
399 struct net_bridge_port *port;
403 port = br_port_get_rcu(dev);
407 fdb = __br_fdb_get(port->br, addr, 0);
408 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
409 fdb->dst->state == BR_STATE_FORWARDING;
415 #endif /* CONFIG_ATM_LANE */
418 * Fill buffer with forwarding table records in
421 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
422 unsigned long maxnum, unsigned long skip)
424 struct __fdb_entry *fe = buf;
426 struct net_bridge_fdb_entry *f;
428 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
431 for (i = 0; i < BR_HASH_SIZE; i++) {
432 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
436 if (has_expired(br, f))
439 /* ignore pseudo entry for local MAC address */
448 /* convert from internal format to API */
449 memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
451 /* due to ABI compat need to split into hi/lo */
452 fe->port_no = f->dst->port_no;
453 fe->port_hi = f->dst->port_no >> 8;
455 fe->is_local = f->is_local;
457 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
469 static struct net_bridge_fdb_entry *fdb_find(struct hlist_head *head,
470 const unsigned char *addr,
473 struct net_bridge_fdb_entry *fdb;
475 hlist_for_each_entry(fdb, head, hlist) {
476 if (ether_addr_equal(fdb->addr.addr, addr) &&
483 static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
484 const unsigned char *addr,
487 struct net_bridge_fdb_entry *fdb;
489 hlist_for_each_entry_rcu(fdb, head, hlist) {
490 if (ether_addr_equal(fdb->addr.addr, addr) &&
497 static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
498 struct net_bridge_port *source,
499 const unsigned char *addr,
501 unsigned char is_local,
502 unsigned char is_static)
504 struct net_bridge_fdb_entry *fdb;
506 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
508 memcpy(fdb->addr.addr, addr, ETH_ALEN);
511 fdb->is_local = is_local;
512 fdb->is_static = is_static;
513 fdb->added_by_user = 0;
514 fdb->added_by_external_learn = 0;
515 fdb->updated = fdb->used = jiffies;
516 hlist_add_head_rcu(&fdb->hlist, head);
521 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
522 const unsigned char *addr, u16 vid)
524 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
525 struct net_bridge_fdb_entry *fdb;
527 if (!is_valid_ether_addr(addr))
530 fdb = fdb_find(head, addr, vid);
532 /* it is okay to have multiple ports with same
533 * address, just use the first one.
537 br_warn(br, "adding interface %s with same address "
538 "as a received packet\n",
539 source ? source->dev->name : br->dev->name);
543 fdb = fdb_create(head, source, addr, vid, 1, 1);
547 fdb_add_hw_addr(br, addr);
548 fdb_notify(br, fdb, RTM_NEWNEIGH);
552 /* Add entry for local address of interface */
553 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
554 const unsigned char *addr, u16 vid)
558 spin_lock_bh(&br->hash_lock);
559 ret = fdb_insert(br, source, addr, vid);
560 spin_unlock_bh(&br->hash_lock);
564 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
565 const unsigned char *addr, u16 vid, bool added_by_user)
567 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
568 struct net_bridge_fdb_entry *fdb;
569 bool fdb_modified = false;
571 /* some users want to always flood. */
572 if (hold_time(br) == 0)
575 /* ignore packets unless we are using this port */
576 if (!(source->state == BR_STATE_LEARNING ||
577 source->state == BR_STATE_FORWARDING))
580 fdb = fdb_find_rcu(head, addr, vid);
582 /* attempt to update an entry for a local interface */
583 if (unlikely(fdb->is_local)) {
585 br_warn(br, "received packet on %s with "
586 "own address as source address\n",
589 /* fastpath: update of existing entry */
590 if (unlikely(source != fdb->dst)) {
594 fdb->updated = jiffies;
595 if (unlikely(added_by_user))
596 fdb->added_by_user = 1;
597 if (unlikely(fdb_modified))
598 fdb_notify(br, fdb, RTM_NEWNEIGH);
601 spin_lock(&br->hash_lock);
602 if (likely(!fdb_find(head, addr, vid))) {
603 fdb = fdb_create(head, source, addr, vid, 0, 0);
605 if (unlikely(added_by_user))
606 fdb->added_by_user = 1;
607 fdb_notify(br, fdb, RTM_NEWNEIGH);
610 /* else we lose race and someone else inserts
611 * it first, don't bother updating
613 spin_unlock(&br->hash_lock);
617 static int fdb_to_nud(const struct net_bridge *br,
618 const struct net_bridge_fdb_entry *fdb)
621 return NUD_PERMANENT;
622 else if (fdb->is_static)
624 else if (has_expired(br, fdb))
627 return NUD_REACHABLE;
630 static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
631 const struct net_bridge_fdb_entry *fdb,
632 u32 portid, u32 seq, int type, unsigned int flags)
634 unsigned long now = jiffies;
635 struct nda_cacheinfo ci;
636 struct nlmsghdr *nlh;
639 nlh = nlmsg_put(skb, portid, seq, type, sizeof(*ndm), flags);
643 ndm = nlmsg_data(nlh);
644 ndm->ndm_family = AF_BRIDGE;
647 ndm->ndm_flags = fdb->added_by_external_learn ? NTF_EXT_LEARNED : 0;
649 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
650 ndm->ndm_state = fdb_to_nud(br, fdb);
652 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
653 goto nla_put_failure;
654 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
655 goto nla_put_failure;
656 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
657 ci.ndm_confirmed = 0;
658 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
660 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
661 goto nla_put_failure;
663 if (fdb->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
664 goto nla_put_failure;
670 nlmsg_cancel(skb, nlh);
674 static inline size_t fdb_nlmsg_size(void)
676 return NLMSG_ALIGN(sizeof(struct ndmsg))
677 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
678 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
679 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
680 + nla_total_size(sizeof(struct nda_cacheinfo));
683 static void fdb_notify(struct net_bridge *br,
684 const struct net_bridge_fdb_entry *fdb, int type)
686 struct net *net = dev_net(br->dev);
690 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
694 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
696 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
697 WARN_ON(err == -EMSGSIZE);
701 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
704 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
707 /* Dump information about entries, in response to GETNEIGH */
708 int br_fdb_dump(struct sk_buff *skb,
709 struct netlink_callback *cb,
710 struct net_device *dev,
711 struct net_device *filter_dev,
714 struct net_bridge *br = netdev_priv(dev);
717 if (!(dev->priv_flags & IFF_EBRIDGE))
721 idx = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
723 for (i = 0; i < BR_HASH_SIZE; i++) {
724 struct net_bridge_fdb_entry *f;
726 hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
727 if (idx < cb->args[0])
731 (!f->dst || f->dst->dev != filter_dev)) {
732 if (filter_dev != dev)
734 /* !f->dst is a special case for bridge
735 * It means the MAC belongs to the bridge
736 * Therefore need a little more filtering
737 * we only want to dump the !f->dst case
742 if (!filter_dev && f->dst)
745 if (fdb_fill_info(skb, br, f,
746 NETLINK_CB(cb->skb).portid,
760 /* Update (create or replace) forwarding database entry */
761 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
762 const __u8 *addr, __u16 state, __u16 flags, __u16 vid)
764 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
765 struct net_bridge_fdb_entry *fdb;
766 bool modified = false;
768 /* If the port cannot learn allow only local and static entries */
769 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
770 !(source->state == BR_STATE_LEARNING ||
771 source->state == BR_STATE_FORWARDING))
774 if (!source && !(state & NUD_PERMANENT)) {
775 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
780 fdb = fdb_find(head, addr, vid);
782 if (!(flags & NLM_F_CREATE))
785 fdb = fdb_create(head, source, addr, vid, 0, 0);
791 if (flags & NLM_F_EXCL)
794 if (fdb->dst != source) {
800 if (fdb_to_nud(br, fdb) != state) {
801 if (state & NUD_PERMANENT) {
803 if (!fdb->is_static) {
805 fdb_add_hw_addr(br, addr);
807 } else if (state & NUD_NOARP) {
809 if (!fdb->is_static) {
811 fdb_add_hw_addr(br, addr);
815 if (fdb->is_static) {
817 fdb_del_hw_addr(br, addr);
823 fdb->added_by_user = 1;
827 fdb->updated = jiffies;
828 fdb_notify(br, fdb, RTM_NEWNEIGH);
834 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
835 struct net_bridge_port *p, const unsigned char *addr,
836 u16 nlh_flags, u16 vid)
840 if (ndm->ndm_flags & NTF_USE) {
842 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
848 br_fdb_update(br, p, addr, vid, true);
852 spin_lock_bh(&br->hash_lock);
853 err = fdb_add_entry(br, p, addr, ndm->ndm_state,
855 spin_unlock_bh(&br->hash_lock);
861 /* Add new permanent fdb entry with RTM_NEWNEIGH */
862 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
863 struct net_device *dev,
864 const unsigned char *addr, u16 vid, u16 nlh_flags)
866 struct net_bridge_vlan_group *vg;
867 struct net_bridge_port *p = NULL;
868 struct net_bridge_vlan *v;
869 struct net_bridge *br = NULL;
872 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
873 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
877 if (is_zero_ether_addr(addr)) {
878 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
882 if (dev->priv_flags & IFF_EBRIDGE) {
883 br = netdev_priv(dev);
884 vg = br_vlan_group(br);
886 p = br_port_get_rtnl(dev);
888 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
893 vg = nbp_vlan_group(p);
897 v = br_vlan_find(vg, vid);
898 if (!v || !br_vlan_should_use(v)) {
899 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
903 /* VID was specified, so use it. */
904 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
906 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
907 if (err || !vg || !vg->num_vlans)
910 /* We have vlans configured on this port and user didn't
911 * specify a VLAN. To be nice, add/update entry for every
914 list_for_each_entry(v, &vg->vlan_list, vlist) {
915 if (!br_vlan_should_use(v))
917 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
927 static int fdb_delete_by_addr(struct net_bridge *br, const u8 *addr,
930 struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
931 struct net_bridge_fdb_entry *fdb;
933 fdb = fdb_find(head, addr, vid);
941 static int __br_fdb_delete_by_addr(struct net_bridge *br,
942 const unsigned char *addr, u16 vid)
946 spin_lock_bh(&br->hash_lock);
947 err = fdb_delete_by_addr(br, addr, vid);
948 spin_unlock_bh(&br->hash_lock);
953 static int fdb_delete_by_addr_and_port(struct net_bridge_port *p,
954 const u8 *addr, u16 vlan)
956 struct net_bridge *br = p->br;
957 struct hlist_head *head = &br->hash[br_mac_hash(addr, vlan)];
958 struct net_bridge_fdb_entry *fdb;
960 fdb = fdb_find(head, addr, vlan);
961 if (!fdb || fdb->dst != p)
968 static int __br_fdb_delete(struct net_bridge_port *p,
969 const unsigned char *addr, u16 vid)
973 spin_lock_bh(&p->br->hash_lock);
974 err = fdb_delete_by_addr_and_port(p, addr, vid);
975 spin_unlock_bh(&p->br->hash_lock);
980 /* Remove neighbor entry with RTM_DELNEIGH */
981 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
982 struct net_device *dev,
983 const unsigned char *addr, u16 vid)
985 struct net_bridge_vlan_group *vg;
986 struct net_bridge_port *p = NULL;
987 struct net_bridge_vlan *v;
988 struct net_bridge *br = NULL;
991 if (dev->priv_flags & IFF_EBRIDGE) {
992 br = netdev_priv(dev);
993 vg = br_vlan_group(br);
995 p = br_port_get_rtnl(dev);
997 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1001 vg = nbp_vlan_group(p);
1005 v = br_vlan_find(vg, vid);
1007 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1011 if (dev->priv_flags & IFF_EBRIDGE)
1012 err = __br_fdb_delete_by_addr(br, addr, vid);
1014 err = __br_fdb_delete(p, addr, vid);
1017 if (dev->priv_flags & IFF_EBRIDGE)
1018 err = __br_fdb_delete_by_addr(br, addr, 0);
1020 err &= __br_fdb_delete(p, addr, 0);
1022 if (!vg || !vg->num_vlans)
1025 list_for_each_entry(v, &vg->vlan_list, vlist) {
1026 if (!br_vlan_should_use(v))
1028 if (dev->priv_flags & IFF_EBRIDGE)
1029 err = __br_fdb_delete_by_addr(br, addr, v->vid);
1031 err &= __br_fdb_delete(p, addr, v->vid);
1038 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1040 struct net_bridge_fdb_entry *fdb, *tmp;
1046 for (i = 0; i < BR_HASH_SIZE; i++) {
1047 hlist_for_each_entry(fdb, &br->hash[i], hlist) {
1048 /* We only care for static entries */
1049 if (!fdb->is_static)
1052 err = dev_uc_add(p->dev, fdb->addr.addr);
1060 for (i = 0; i < BR_HASH_SIZE; i++) {
1061 hlist_for_each_entry(tmp, &br->hash[i], hlist) {
1062 /* If we reached the fdb that failed, we can stop */
1066 /* We only care for static entries */
1067 if (!tmp->is_static)
1070 dev_uc_del(p->dev, tmp->addr.addr);
1076 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1078 struct net_bridge_fdb_entry *fdb;
1083 for (i = 0; i < BR_HASH_SIZE; i++) {
1084 hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) {
1085 /* We only care for static entries */
1086 if (!fdb->is_static)
1089 dev_uc_del(p->dev, fdb->addr.addr);
1094 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1095 const unsigned char *addr, u16 vid)
1097 struct hlist_head *head;
1098 struct net_bridge_fdb_entry *fdb;
1102 spin_lock_bh(&br->hash_lock);
1104 head = &br->hash[br_mac_hash(addr, vid)];
1105 fdb = fdb_find(head, addr, vid);
1107 fdb = fdb_create(head, p, addr, vid, 0, 0);
1112 fdb->added_by_external_learn = 1;
1113 fdb_notify(br, fdb, RTM_NEWNEIGH);
1114 } else if (fdb->added_by_external_learn) {
1116 fdb->updated = fdb->used = jiffies;
1117 } else if (!fdb->added_by_user) {
1118 /* Take over SW learned entry */
1119 fdb->added_by_external_learn = 1;
1120 fdb->updated = jiffies;
1121 fdb_notify(br, fdb, RTM_NEWNEIGH);
1125 spin_unlock_bh(&br->hash_lock);
1130 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1131 const unsigned char *addr, u16 vid)
1133 struct hlist_head *head;
1134 struct net_bridge_fdb_entry *fdb;
1138 spin_lock_bh(&br->hash_lock);
1140 head = &br->hash[br_mac_hash(addr, vid)];
1141 fdb = fdb_find(head, addr, vid);
1142 if (fdb && fdb->added_by_external_learn)
1143 fdb_delete(br, fdb);
1147 spin_unlock_bh(&br->hash_lock);