1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Linux ethernet bridge
7 * Lennert Buytenhek <buytenh@gnu.org>
10 #include <linux/kernel.h>
11 #include <linux/init.h>
12 #include <linux/rculist.h>
13 #include <linux/spinlock.h>
14 #include <linux/times.h>
15 #include <linux/netdevice.h>
16 #include <linux/etherdevice.h>
17 #include <linux/jhash.h>
18 #include <linux/random.h>
19 #include <linux/slab.h>
20 #include <linux/atomic.h>
21 #include <asm/unaligned.h>
22 #include <linux/if_vlan.h>
23 #include <net/switchdev.h>
24 #include <trace/events/bridge.h>
25 #include "br_private.h"
27 static const struct rhashtable_params br_fdb_rht_params = {
28 .head_offset = offsetof(struct net_bridge_fdb_entry, rhnode),
29 .key_offset = offsetof(struct net_bridge_fdb_entry, key),
30 .key_len = sizeof(struct net_bridge_fdb_key),
31 .automatic_shrinking = true,
34 static struct kmem_cache *br_fdb_cache __read_mostly;
35 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
36 const unsigned char *addr, u16 vid);
37 static void fdb_notify(struct net_bridge *br,
38 const struct net_bridge_fdb_entry *, int, bool);
40 int __init br_fdb_init(void)
42 br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
43 sizeof(struct net_bridge_fdb_entry),
45 SLAB_HWCACHE_ALIGN, NULL);
52 void br_fdb_fini(void)
54 kmem_cache_destroy(br_fdb_cache);
57 int br_fdb_hash_init(struct net_bridge *br)
59 return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
62 void br_fdb_hash_fini(struct net_bridge *br)
64 rhashtable_destroy(&br->fdb_hash_tbl);
67 /* if topology_changing then use forward_delay (default 15 sec)
68 * otherwise keep longer (default 5 minutes)
70 static inline unsigned long hold_time(const struct net_bridge *br)
72 return br->topology_change ? br->forward_delay : br->ageing_time;
75 static inline int has_expired(const struct net_bridge *br,
76 const struct net_bridge_fdb_entry *fdb)
78 return !fdb->is_static && !fdb->added_by_external_learn &&
79 time_before_eq(fdb->updated + hold_time(br), jiffies);
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 static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
90 const unsigned char *addr,
93 struct net_bridge_fdb_key key;
95 WARN_ON_ONCE(!rcu_read_lock_held());
98 memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
100 return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
103 /* requires bridge hash_lock */
104 static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
105 const unsigned char *addr,
108 struct net_bridge_fdb_entry *fdb;
110 lockdep_assert_held_once(&br->hash_lock);
113 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
119 struct net_device *br_fdb_find_port(const struct net_device *br_dev,
120 const unsigned char *addr,
123 struct net_bridge_fdb_entry *f;
124 struct net_device *dev = NULL;
125 struct net_bridge *br;
129 if (!netif_is_bridge_master(br_dev))
132 br = netdev_priv(br_dev);
134 f = br_fdb_find_rcu(br, addr, vid);
141 EXPORT_SYMBOL_GPL(br_fdb_find_port);
143 struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
144 const unsigned char *addr,
147 return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
150 /* When a static FDB entry is added, the mac address from the entry is
151 * added to the bridge private HW address list and all required ports
152 * are then updated with the new information.
155 static void fdb_add_hw_addr(struct net_bridge *br, const unsigned char *addr)
158 struct net_bridge_port *p;
162 list_for_each_entry(p, &br->port_list, list) {
163 if (!br_promisc_port(p)) {
164 err = dev_uc_add(p->dev, addr);
172 list_for_each_entry_continue_reverse(p, &br->port_list, list) {
173 if (!br_promisc_port(p))
174 dev_uc_del(p->dev, addr);
178 /* When a static FDB entry is deleted, the HW address from that entry is
179 * also removed from the bridge private HW address list and updates all
180 * the ports with needed information.
183 static void fdb_del_hw_addr(struct net_bridge *br, const unsigned char *addr)
185 struct net_bridge_port *p;
189 list_for_each_entry(p, &br->port_list, list) {
190 if (!br_promisc_port(p))
191 dev_uc_del(p->dev, addr);
195 static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f,
198 trace_fdb_delete(br, f);
201 fdb_del_hw_addr(br, f->key.addr.addr);
203 hlist_del_init_rcu(&f->fdb_node);
204 rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
206 fdb_notify(br, f, RTM_DELNEIGH, swdev_notify);
207 call_rcu(&f->rcu, fdb_rcu_free);
210 /* Delete a local entry if no other port had the same address. */
211 static void fdb_delete_local(struct net_bridge *br,
212 const struct net_bridge_port *p,
213 struct net_bridge_fdb_entry *f)
215 const unsigned char *addr = f->key.addr.addr;
216 struct net_bridge_vlan_group *vg;
217 const struct net_bridge_vlan *v;
218 struct net_bridge_port *op;
219 u16 vid = f->key.vlan_id;
221 /* Maybe another port has same hw addr? */
222 list_for_each_entry(op, &br->port_list, list) {
223 vg = nbp_vlan_group(op);
224 if (op != p && ether_addr_equal(op->dev->dev_addr, addr) &&
225 (!vid || br_vlan_find(vg, vid))) {
227 f->added_by_user = 0;
232 vg = br_vlan_group(br);
233 v = br_vlan_find(vg, vid);
234 /* Maybe bridge device has same hw addr? */
235 if (p && ether_addr_equal(br->dev->dev_addr, addr) &&
236 (!vid || (v && br_vlan_should_use(v)))) {
238 f->added_by_user = 0;
242 fdb_delete(br, f, true);
245 void br_fdb_find_delete_local(struct net_bridge *br,
246 const struct net_bridge_port *p,
247 const unsigned char *addr, u16 vid)
249 struct net_bridge_fdb_entry *f;
251 spin_lock_bh(&br->hash_lock);
252 f = br_fdb_find(br, addr, vid);
253 if (f && f->is_local && !f->added_by_user && f->dst == p)
254 fdb_delete_local(br, p, f);
255 spin_unlock_bh(&br->hash_lock);
258 void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
260 struct net_bridge_vlan_group *vg;
261 struct net_bridge_fdb_entry *f;
262 struct net_bridge *br = p->br;
263 struct net_bridge_vlan *v;
265 spin_lock_bh(&br->hash_lock);
266 vg = nbp_vlan_group(p);
267 hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
268 if (f->dst == p && f->is_local && !f->added_by_user) {
270 fdb_delete_local(br, p, f);
272 /* if this port has no vlan information
273 * configured, we can safely be done at
276 if (!vg || !vg->num_vlans)
282 /* insert new address, may fail if invalid address or dup. */
283 fdb_insert(br, p, newaddr, 0);
285 if (!vg || !vg->num_vlans)
288 /* Now add entries for every VLAN configured on the port.
289 * This function runs under RTNL so the bitmap will not change
292 list_for_each_entry(v, &vg->vlan_list, vlist)
293 fdb_insert(br, p, newaddr, v->vid);
296 spin_unlock_bh(&br->hash_lock);
299 void br_fdb_change_mac_address(struct net_bridge *br, const u8 *newaddr)
301 struct net_bridge_vlan_group *vg;
302 struct net_bridge_fdb_entry *f;
303 struct net_bridge_vlan *v;
305 spin_lock_bh(&br->hash_lock);
307 /* If old entry was unassociated with any port, then delete it. */
308 f = br_fdb_find(br, br->dev->dev_addr, 0);
309 if (f && f->is_local && !f->dst && !f->added_by_user)
310 fdb_delete_local(br, NULL, f);
312 fdb_insert(br, NULL, newaddr, 0);
313 vg = br_vlan_group(br);
314 if (!vg || !vg->num_vlans)
316 /* Now remove and add entries for every VLAN configured on the
317 * bridge. This function runs under RTNL so the bitmap will not
318 * change from under us.
320 list_for_each_entry(v, &vg->vlan_list, vlist) {
321 if (!br_vlan_should_use(v))
323 f = br_fdb_find(br, br->dev->dev_addr, v->vid);
324 if (f && f->is_local && !f->dst && !f->added_by_user)
325 fdb_delete_local(br, NULL, f);
326 fdb_insert(br, NULL, newaddr, v->vid);
329 spin_unlock_bh(&br->hash_lock);
332 void br_fdb_cleanup(struct work_struct *work)
334 struct net_bridge *br = container_of(work, struct net_bridge,
336 struct net_bridge_fdb_entry *f = NULL;
337 unsigned long delay = hold_time(br);
338 unsigned long work_delay = delay;
339 unsigned long now = jiffies;
341 /* this part is tricky, in order to avoid blocking learning and
342 * consequently forwarding, we rely on rcu to delete objects with
343 * delayed freeing allowing us to continue traversing
346 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
347 unsigned long this_timer;
349 if (f->is_static || f->added_by_external_learn)
351 this_timer = f->updated + delay;
352 if (time_after(this_timer, now)) {
353 work_delay = min(work_delay, this_timer - now);
355 spin_lock_bh(&br->hash_lock);
356 if (!hlist_unhashed(&f->fdb_node))
357 fdb_delete(br, f, true);
358 spin_unlock_bh(&br->hash_lock);
363 /* Cleanup minimum 10 milliseconds apart */
364 work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
365 mod_delayed_work(system_long_wq, &br->gc_work, work_delay);
368 /* Completely flush all dynamic entries in forwarding database.*/
369 void br_fdb_flush(struct net_bridge *br)
371 struct net_bridge_fdb_entry *f;
372 struct hlist_node *tmp;
374 spin_lock_bh(&br->hash_lock);
375 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
377 fdb_delete(br, f, true);
379 spin_unlock_bh(&br->hash_lock);
382 /* Flush all entries referring to a specific port.
383 * if do_all is set also flush static entries
384 * if vid is set delete all entries that match the vlan_id
386 void br_fdb_delete_by_port(struct net_bridge *br,
387 const struct net_bridge_port *p,
391 struct net_bridge_fdb_entry *f;
392 struct hlist_node *tmp;
394 spin_lock_bh(&br->hash_lock);
395 hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
400 if (f->is_static || (vid && f->key.vlan_id != vid))
404 fdb_delete_local(br, p, f);
406 fdb_delete(br, f, true);
408 spin_unlock_bh(&br->hash_lock);
411 #if IS_ENABLED(CONFIG_ATM_LANE)
412 /* Interface used by ATM LANE hook to test
413 * if an addr is on some other bridge port */
414 int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
416 struct net_bridge_fdb_entry *fdb;
417 struct net_bridge_port *port;
421 port = br_port_get_rcu(dev);
425 fdb = br_fdb_find_rcu(port->br, addr, 0);
426 ret = fdb && fdb->dst && fdb->dst->dev != dev &&
427 fdb->dst->state == BR_STATE_FORWARDING;
433 #endif /* CONFIG_ATM_LANE */
436 * Fill buffer with forwarding table records in
439 int br_fdb_fillbuf(struct net_bridge *br, void *buf,
440 unsigned long maxnum, unsigned long skip)
442 struct net_bridge_fdb_entry *f;
443 struct __fdb_entry *fe = buf;
446 memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
449 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
453 if (has_expired(br, f))
456 /* ignore pseudo entry for local MAC address */
465 /* convert from internal format to API */
466 memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
468 /* due to ABI compat need to split into hi/lo */
469 fe->port_no = f->dst->port_no;
470 fe->port_hi = f->dst->port_no >> 8;
472 fe->is_local = f->is_local;
474 fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
483 static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
484 struct net_bridge_port *source,
485 const unsigned char *addr,
487 unsigned char is_local,
488 unsigned char is_static)
490 struct net_bridge_fdb_entry *fdb;
492 fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
494 memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
496 fdb->key.vlan_id = vid;
497 fdb->is_local = is_local;
498 fdb->is_static = is_static;
499 fdb->added_by_user = 0;
500 fdb->added_by_external_learn = 0;
503 fdb->updated = fdb->used = jiffies;
504 if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
506 br_fdb_rht_params)) {
507 kmem_cache_free(br_fdb_cache, fdb);
510 hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
516 static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
517 const unsigned char *addr, u16 vid)
519 struct net_bridge_fdb_entry *fdb;
521 if (!is_valid_ether_addr(addr))
524 fdb = br_fdb_find(br, addr, vid);
526 /* it is okay to have multiple ports with same
527 * address, just use the first one.
531 br_warn(br, "adding interface %s with same address as a received packet (addr:%pM, vlan:%u)\n",
532 source ? source->dev->name : br->dev->name, addr, vid);
533 fdb_delete(br, fdb, true);
536 fdb = fdb_create(br, source, addr, vid, 1, 1);
540 fdb_add_hw_addr(br, addr);
541 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
545 /* Add entry for local address of interface */
546 int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
547 const unsigned char *addr, u16 vid)
551 spin_lock_bh(&br->hash_lock);
552 ret = fdb_insert(br, source, addr, vid);
553 spin_unlock_bh(&br->hash_lock);
557 void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
558 const unsigned char *addr, u16 vid, bool added_by_user)
560 struct net_bridge_fdb_entry *fdb;
561 bool fdb_modified = false;
563 /* some users want to always flood. */
564 if (hold_time(br) == 0)
567 /* ignore packets unless we are using this port */
568 if (!(source->state == BR_STATE_LEARNING ||
569 source->state == BR_STATE_FORWARDING))
572 fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
574 /* attempt to update an entry for a local interface */
575 if (unlikely(fdb->is_local)) {
577 br_warn(br, "received packet on %s with own address as source address (addr:%pM, vlan:%u)\n",
578 source->dev->name, addr, vid);
580 unsigned long now = jiffies;
582 /* fastpath: update of existing entry */
583 if (unlikely(source != fdb->dst && !fdb->is_sticky)) {
586 /* Take over HW learned entry */
587 if (unlikely(fdb->added_by_external_learn))
588 fdb->added_by_external_learn = 0;
590 if (now != fdb->updated)
592 if (unlikely(added_by_user))
593 fdb->added_by_user = 1;
594 if (unlikely(fdb_modified)) {
595 trace_br_fdb_update(br, source, addr, vid, added_by_user);
596 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
600 spin_lock(&br->hash_lock);
601 fdb = fdb_create(br, source, addr, vid, 0, 0);
603 if (unlikely(added_by_user))
604 fdb->added_by_user = 1;
605 trace_br_fdb_update(br, source, addr, vid,
607 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
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;
648 ndm->ndm_ifindex = fdb->dst ? fdb->dst->dev->ifindex : br->dev->ifindex;
649 ndm->ndm_state = fdb_to_nud(br, fdb);
652 ndm->ndm_flags |= NTF_OFFLOADED;
653 if (fdb->added_by_external_learn)
654 ndm->ndm_flags |= NTF_EXT_LEARNED;
656 ndm->ndm_flags |= NTF_STICKY;
658 if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
659 goto nla_put_failure;
660 if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
661 goto nla_put_failure;
662 ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
663 ci.ndm_confirmed = 0;
664 ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
666 if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
667 goto nla_put_failure;
669 if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
671 goto nla_put_failure;
677 nlmsg_cancel(skb, nlh);
681 static inline size_t fdb_nlmsg_size(void)
683 return NLMSG_ALIGN(sizeof(struct ndmsg))
684 + nla_total_size(ETH_ALEN) /* NDA_LLADDR */
685 + nla_total_size(sizeof(u32)) /* NDA_MASTER */
686 + nla_total_size(sizeof(u16)) /* NDA_VLAN */
687 + nla_total_size(sizeof(struct nda_cacheinfo));
690 static void fdb_notify(struct net_bridge *br,
691 const struct net_bridge_fdb_entry *fdb, int type,
694 struct net *net = dev_net(br->dev);
699 br_switchdev_fdb_notify(fdb, type);
701 skb = nlmsg_new(fdb_nlmsg_size(), GFP_ATOMIC);
705 err = fdb_fill_info(skb, br, fdb, 0, 0, type, 0);
707 /* -EMSGSIZE implies BUG in fdb_nlmsg_size() */
708 WARN_ON(err == -EMSGSIZE);
712 rtnl_notify(skb, net, 0, RTNLGRP_NEIGH, NULL, GFP_ATOMIC);
715 rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
718 /* Dump information about entries, in response to GETNEIGH */
719 int br_fdb_dump(struct sk_buff *skb,
720 struct netlink_callback *cb,
721 struct net_device *dev,
722 struct net_device *filter_dev,
725 struct net_bridge *br = netdev_priv(dev);
726 struct net_bridge_fdb_entry *f;
729 if (!(dev->priv_flags & IFF_EBRIDGE))
733 err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
739 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
740 if (*idx < cb->args[2])
742 if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
743 if (filter_dev != dev)
745 /* !f->dst is a special case for bridge
746 * It means the MAC belongs to the bridge
747 * Therefore need a little more filtering
748 * we only want to dump the !f->dst case
753 if (!filter_dev && f->dst)
756 err = fdb_fill_info(skb, br, f,
757 NETLINK_CB(cb->skb).portid,
771 int br_fdb_get(struct sk_buff *skb,
773 struct net_device *dev,
774 const unsigned char *addr,
775 u16 vid, u32 portid, u32 seq,
776 struct netlink_ext_ack *extack)
778 struct net_bridge *br = netdev_priv(dev);
779 struct net_bridge_fdb_entry *f;
783 f = br_fdb_find_rcu(br, addr, vid);
785 NL_SET_ERR_MSG(extack, "Fdb entry not found");
790 err = fdb_fill_info(skb, br, f, portid, seq,
797 /* Update (create or replace) forwarding database entry */
798 static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
799 const u8 *addr, u16 state, u16 flags, u16 vid,
802 u8 is_sticky = !!(ndm_flags & NTF_STICKY);
803 struct net_bridge_fdb_entry *fdb;
804 bool modified = false;
806 /* If the port cannot learn allow only local and static entries */
807 if (source && !(state & NUD_PERMANENT) && !(state & NUD_NOARP) &&
808 !(source->state == BR_STATE_LEARNING ||
809 source->state == BR_STATE_FORWARDING))
812 if (!source && !(state & NUD_PERMANENT)) {
813 pr_info("bridge: RTM_NEWNEIGH %s without NUD_PERMANENT\n",
818 if (is_sticky && (state & NUD_PERMANENT))
821 fdb = br_fdb_find(br, addr, vid);
823 if (!(flags & NLM_F_CREATE))
826 fdb = fdb_create(br, source, addr, vid, 0, 0);
832 if (flags & NLM_F_EXCL)
835 if (fdb->dst != source) {
841 if (fdb_to_nud(br, fdb) != state) {
842 if (state & NUD_PERMANENT) {
844 if (!fdb->is_static) {
846 fdb_add_hw_addr(br, addr);
848 } else if (state & NUD_NOARP) {
850 if (!fdb->is_static) {
852 fdb_add_hw_addr(br, addr);
856 if (fdb->is_static) {
858 fdb_del_hw_addr(br, addr);
865 if (is_sticky != fdb->is_sticky) {
866 fdb->is_sticky = is_sticky;
870 fdb->added_by_user = 1;
874 fdb->updated = jiffies;
875 fdb_notify(br, fdb, RTM_NEWNEIGH, true);
881 static int __br_fdb_add(struct ndmsg *ndm, struct net_bridge *br,
882 struct net_bridge_port *p, const unsigned char *addr,
883 u16 nlh_flags, u16 vid)
887 if (ndm->ndm_flags & NTF_USE) {
889 pr_info("bridge: RTM_NEWNEIGH %s with NTF_USE is not supported\n",
895 br_fdb_update(br, p, addr, vid, true);
898 } else if (ndm->ndm_flags & NTF_EXT_LEARNED) {
899 err = br_fdb_external_learn_add(br, p, addr, vid, true);
901 spin_lock_bh(&br->hash_lock);
902 err = fdb_add_entry(br, p, addr, ndm->ndm_state,
903 nlh_flags, vid, ndm->ndm_flags);
904 spin_unlock_bh(&br->hash_lock);
910 /* Add new permanent fdb entry with RTM_NEWNEIGH */
911 int br_fdb_add(struct ndmsg *ndm, struct nlattr *tb[],
912 struct net_device *dev,
913 const unsigned char *addr, u16 vid, u16 nlh_flags,
914 struct netlink_ext_ack *extack)
916 struct net_bridge_vlan_group *vg;
917 struct net_bridge_port *p = NULL;
918 struct net_bridge_vlan *v;
919 struct net_bridge *br = NULL;
922 trace_br_fdb_add(ndm, dev, addr, vid, nlh_flags);
924 if (!(ndm->ndm_state & (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE))) {
925 pr_info("bridge: RTM_NEWNEIGH with invalid state %#x\n", ndm->ndm_state);
929 if (is_zero_ether_addr(addr)) {
930 pr_info("bridge: RTM_NEWNEIGH with invalid ether address\n");
934 if (dev->priv_flags & IFF_EBRIDGE) {
935 br = netdev_priv(dev);
936 vg = br_vlan_group(br);
938 p = br_port_get_rtnl(dev);
940 pr_info("bridge: RTM_NEWNEIGH %s not a bridge port\n",
945 vg = nbp_vlan_group(p);
949 v = br_vlan_find(vg, vid);
950 if (!v || !br_vlan_should_use(v)) {
951 pr_info("bridge: RTM_NEWNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
955 /* VID was specified, so use it. */
956 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, vid);
958 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, 0);
959 if (err || !vg || !vg->num_vlans)
962 /* We have vlans configured on this port and user didn't
963 * specify a VLAN. To be nice, add/update entry for every
966 list_for_each_entry(v, &vg->vlan_list, vlist) {
967 if (!br_vlan_should_use(v))
969 err = __br_fdb_add(ndm, br, p, addr, nlh_flags, v->vid);
979 static int fdb_delete_by_addr_and_port(struct net_bridge *br,
980 const struct net_bridge_port *p,
981 const u8 *addr, u16 vlan)
983 struct net_bridge_fdb_entry *fdb;
985 fdb = br_fdb_find(br, addr, vlan);
986 if (!fdb || fdb->dst != p)
989 fdb_delete(br, fdb, true);
994 static int __br_fdb_delete(struct net_bridge *br,
995 const struct net_bridge_port *p,
996 const unsigned char *addr, u16 vid)
1000 spin_lock_bh(&br->hash_lock);
1001 err = fdb_delete_by_addr_and_port(br, p, addr, vid);
1002 spin_unlock_bh(&br->hash_lock);
1007 /* Remove neighbor entry with RTM_DELNEIGH */
1008 int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
1009 struct net_device *dev,
1010 const unsigned char *addr, u16 vid)
1012 struct net_bridge_vlan_group *vg;
1013 struct net_bridge_port *p = NULL;
1014 struct net_bridge_vlan *v;
1015 struct net_bridge *br;
1018 if (dev->priv_flags & IFF_EBRIDGE) {
1019 br = netdev_priv(dev);
1020 vg = br_vlan_group(br);
1022 p = br_port_get_rtnl(dev);
1024 pr_info("bridge: RTM_DELNEIGH %s not a bridge port\n",
1028 vg = nbp_vlan_group(p);
1033 v = br_vlan_find(vg, vid);
1035 pr_info("bridge: RTM_DELNEIGH with unconfigured vlan %d on %s\n", vid, dev->name);
1039 err = __br_fdb_delete(br, p, addr, vid);
1042 err &= __br_fdb_delete(br, p, addr, 0);
1043 if (!vg || !vg->num_vlans)
1046 list_for_each_entry(v, &vg->vlan_list, vlist) {
1047 if (!br_vlan_should_use(v))
1049 err &= __br_fdb_delete(br, p, addr, v->vid);
1056 int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
1058 struct net_bridge_fdb_entry *f, *tmp;
1063 /* the key here is that static entries change only under rtnl */
1065 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1066 /* We only care for static entries */
1069 err = dev_uc_add(p->dev, f->key.addr.addr);
1079 hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
1080 /* We only care for static entries */
1081 if (!tmp->is_static)
1085 dev_uc_del(p->dev, tmp->key.addr.addr);
1091 void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
1093 struct net_bridge_fdb_entry *f;
1098 hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
1099 /* We only care for static entries */
1103 dev_uc_del(p->dev, f->key.addr.addr);
1108 int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
1109 const unsigned char *addr, u16 vid,
1112 struct net_bridge_fdb_entry *fdb;
1113 bool modified = false;
1116 trace_br_fdb_external_learn_add(br, p, addr, vid);
1118 spin_lock_bh(&br->hash_lock);
1120 fdb = br_fdb_find(br, addr, vid);
1122 fdb = fdb_create(br, p, addr, vid, 0, 0);
1128 fdb->added_by_user = 1;
1129 fdb->added_by_external_learn = 1;
1130 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1132 fdb->updated = jiffies;
1134 if (fdb->dst != p) {
1139 if (fdb->added_by_external_learn) {
1141 fdb->used = jiffies;
1142 } else if (!fdb->added_by_user) {
1143 /* Take over SW learned entry */
1144 fdb->added_by_external_learn = 1;
1149 fdb->added_by_user = 1;
1152 fdb_notify(br, fdb, RTM_NEWNEIGH, swdev_notify);
1156 spin_unlock_bh(&br->hash_lock);
1161 int br_fdb_external_learn_del(struct net_bridge *br, struct net_bridge_port *p,
1162 const unsigned char *addr, u16 vid,
1165 struct net_bridge_fdb_entry *fdb;
1168 spin_lock_bh(&br->hash_lock);
1170 fdb = br_fdb_find(br, addr, vid);
1171 if (fdb && fdb->added_by_external_learn)
1172 fdb_delete(br, fdb, swdev_notify);
1176 spin_unlock_bh(&br->hash_lock);
1181 void br_fdb_offloaded_set(struct net_bridge *br, struct net_bridge_port *p,
1182 const unsigned char *addr, u16 vid, bool offloaded)
1184 struct net_bridge_fdb_entry *fdb;
1186 spin_lock_bh(&br->hash_lock);
1188 fdb = br_fdb_find(br, addr, vid);
1190 fdb->offloaded = offloaded;
1192 spin_unlock_bh(&br->hash_lock);
1195 void br_fdb_clear_offload(const struct net_device *dev, u16 vid)
1197 struct net_bridge_fdb_entry *f;
1198 struct net_bridge_port *p;
1202 p = br_port_get_rtnl(dev);
1206 spin_lock_bh(&p->br->hash_lock);
1207 hlist_for_each_entry(f, &p->br->fdb_list, fdb_node) {
1208 if (f->dst == p && f->key.vlan_id == vid)
1211 spin_unlock_bh(&p->br->hash_lock);
1213 EXPORT_SYMBOL_GPL(br_fdb_clear_offload);