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Diffstat (limited to 'net/bridge/br_fdb.c')
-rw-r--r--net/bridge/br_fdb.c392
1 files changed, 183 insertions, 209 deletions
diff --git a/net/bridge/br_fdb.c b/net/bridge/br_fdb.c
index 4ea5c8bbe286..dc87fbc9a23b 100644
--- a/net/bridge/br_fdb.c
+++ b/net/bridge/br_fdb.c
@@ -28,14 +28,20 @@
#include <trace/events/bridge.h>
#include "br_private.h"
+static const struct rhashtable_params br_fdb_rht_params = {
+ .head_offset = offsetof(struct net_bridge_fdb_entry, rhnode),
+ .key_offset = offsetof(struct net_bridge_fdb_entry, key),
+ .key_len = sizeof(struct net_bridge_fdb_key),
+ .automatic_shrinking = true,
+ .locks_mul = 1,
+};
+
static struct kmem_cache *br_fdb_cache __read_mostly;
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid);
static void fdb_notify(struct net_bridge *br,
const struct net_bridge_fdb_entry *, int);
-static u32 fdb_salt __read_mostly;
-
int __init br_fdb_init(void)
{
br_fdb_cache = kmem_cache_create("bridge_fdb_cache",
@@ -45,7 +51,6 @@ int __init br_fdb_init(void)
if (!br_fdb_cache)
return -ENOMEM;
- get_random_bytes(&fdb_salt, sizeof(fdb_salt));
return 0;
}
@@ -54,6 +59,15 @@ void br_fdb_fini(void)
kmem_cache_destroy(br_fdb_cache);
}
+int br_fdb_hash_init(struct net_bridge *br)
+{
+ return rhashtable_init(&br->fdb_hash_tbl, &br_fdb_rht_params);
+}
+
+void br_fdb_hash_fini(struct net_bridge *br)
+{
+ rhashtable_destroy(&br->fdb_hash_tbl);
+}
/* if topology_changing then use forward_delay (default 15 sec)
* otherwise keep longer (default 5 minutes)
@@ -70,13 +84,6 @@ static inline int has_expired(const struct net_bridge *br,
time_before_eq(fdb->updated + hold_time(br), jiffies);
}
-static inline int br_mac_hash(const unsigned char *mac, __u16 vid)
-{
- /* use 1 byte of OUI and 3 bytes of NIC */
- u32 key = get_unaligned((u32 *)(mac + 2));
- return jhash_2words(key, vid, fdb_salt) & (BR_HASH_SIZE - 1);
-}
-
static void fdb_rcu_free(struct rcu_head *head)
{
struct net_bridge_fdb_entry *ent
@@ -84,19 +91,18 @@ static void fdb_rcu_free(struct rcu_head *head)
kmem_cache_free(br_fdb_cache, ent);
}
-static struct net_bridge_fdb_entry *fdb_find_rcu(struct hlist_head *head,
+static struct net_bridge_fdb_entry *fdb_find_rcu(struct rhashtable *tbl,
const unsigned char *addr,
__u16 vid)
{
- struct net_bridge_fdb_entry *f;
+ struct net_bridge_fdb_key key;
WARN_ON_ONCE(!rcu_read_lock_held());
- hlist_for_each_entry_rcu(f, head, hlist)
- if (ether_addr_equal(f->addr.addr, addr) && f->vlan_id == vid)
- break;
+ key.vlan_id = vid;
+ memcpy(key.addr.addr, addr, sizeof(key.addr.addr));
- return f;
+ return rhashtable_lookup(tbl, &key, br_fdb_rht_params);
}
/* requires bridge hash_lock */
@@ -104,13 +110,12 @@ static struct net_bridge_fdb_entry *br_fdb_find(struct net_bridge *br,
const unsigned char *addr,
__u16 vid)
{
- struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
struct net_bridge_fdb_entry *fdb;
lockdep_assert_held_once(&br->hash_lock);
rcu_read_lock();
- fdb = fdb_find_rcu(head, addr, vid);
+ fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
rcu_read_unlock();
return fdb;
@@ -120,9 +125,7 @@ struct net_bridge_fdb_entry *br_fdb_find_rcu(struct net_bridge *br,
const unsigned char *addr,
__u16 vid)
{
- struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
-
- return fdb_find_rcu(head, addr, vid);
+ return fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
}
/* When a static FDB entry is added, the mac address from the entry is
@@ -175,9 +178,11 @@ static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
trace_fdb_delete(br, f);
if (f->is_static)
- fdb_del_hw_addr(br, f->addr.addr);
+ fdb_del_hw_addr(br, f->key.addr.addr);
- hlist_del_init_rcu(&f->hlist);
+ hlist_del_init_rcu(&f->fdb_node);
+ rhashtable_remove_fast(&br->fdb_hash_tbl, &f->rhnode,
+ br_fdb_rht_params);
fdb_notify(br, f, RTM_DELNEIGH);
call_rcu(&f->rcu, fdb_rcu_free);
}
@@ -187,11 +192,11 @@ static void fdb_delete_local(struct net_bridge *br,
const struct net_bridge_port *p,
struct net_bridge_fdb_entry *f)
{
- const unsigned char *addr = f->addr.addr;
+ const unsigned char *addr = f->key.addr.addr;
struct net_bridge_vlan_group *vg;
const struct net_bridge_vlan *v;
struct net_bridge_port *op;
- u16 vid = f->vlan_id;
+ u16 vid = f->key.vlan_id;
/* Maybe another port has same hw addr? */
list_for_each_entry(op, &br->port_list, list) {
@@ -233,31 +238,23 @@ void br_fdb_find_delete_local(struct net_bridge *br,
void br_fdb_changeaddr(struct net_bridge_port *p, const unsigned char *newaddr)
{
struct net_bridge_vlan_group *vg;
+ struct net_bridge_fdb_entry *f;
struct net_bridge *br = p->br;
struct net_bridge_vlan *v;
- int i;
spin_lock_bh(&br->hash_lock);
-
vg = nbp_vlan_group(p);
- /* Search all chains since old address/hash is unknown */
- for (i = 0; i < BR_HASH_SIZE; i++) {
- struct hlist_node *h;
- hlist_for_each(h, &br->hash[i]) {
- struct net_bridge_fdb_entry *f;
-
- f = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
- if (f->dst == p && f->is_local && !f->added_by_user) {
- /* delete old one */
- fdb_delete_local(br, p, f);
-
- /* if this port has no vlan information
- * configured, we can safely be done at
- * this point.
- */
- if (!vg || !vg->num_vlans)
- goto insert;
- }
+ hlist_for_each_entry(f, &br->fdb_list, fdb_node) {
+ if (f->dst == p && f->is_local && !f->added_by_user) {
+ /* delete old one */
+ fdb_delete_local(br, p, f);
+
+ /* if this port has no vlan information
+ * configured, we can safely be done at
+ * this point.
+ */
+ if (!vg || !vg->num_vlans)
+ goto insert;
}
}
@@ -316,35 +313,32 @@ void br_fdb_cleanup(struct work_struct *work)
{
struct net_bridge *br = container_of(work, struct net_bridge,
gc_work.work);
+ struct net_bridge_fdb_entry *f = NULL;
unsigned long delay = hold_time(br);
unsigned long work_delay = delay;
unsigned long now = jiffies;
- int i;
- for (i = 0; i < BR_HASH_SIZE; i++) {
- struct net_bridge_fdb_entry *f;
- struct hlist_node *n;
+ /* this part is tricky, in order to avoid blocking learning and
+ * consequently forwarding, we rely on rcu to delete objects with
+ * delayed freeing allowing us to continue traversing
+ */
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
+ unsigned long this_timer;
- if (!br->hash[i].first)
+ if (f->is_static || f->added_by_external_learn)
continue;
-
- spin_lock_bh(&br->hash_lock);
- hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
- unsigned long this_timer;
-
- if (f->is_static)
- continue;
- if (f->added_by_external_learn)
- continue;
- this_timer = f->updated + delay;
- if (time_after(this_timer, now))
- work_delay = min(work_delay, this_timer - now);
- else
+ this_timer = f->updated + delay;
+ if (time_after(this_timer, now)) {
+ work_delay = min(work_delay, this_timer - now);
+ } else {
+ spin_lock_bh(&br->hash_lock);
+ if (!hlist_unhashed(&f->fdb_node))
fdb_delete(br, f);
+ spin_unlock_bh(&br->hash_lock);
}
- spin_unlock_bh(&br->hash_lock);
- cond_resched();
}
+ rcu_read_unlock();
/* Cleanup minimum 10 milliseconds apart */
work_delay = max_t(unsigned long, work_delay, msecs_to_jiffies(10));
@@ -354,16 +348,13 @@ void br_fdb_cleanup(struct work_struct *work)
/* Completely flush all dynamic entries in forwarding database.*/
void br_fdb_flush(struct net_bridge *br)
{
- int i;
+ struct net_bridge_fdb_entry *f;
+ struct hlist_node *tmp;
spin_lock_bh(&br->hash_lock);
- for (i = 0; i < BR_HASH_SIZE; i++) {
- struct net_bridge_fdb_entry *f;
- struct hlist_node *n;
- hlist_for_each_entry_safe(f, n, &br->hash[i], hlist) {
- if (!f->is_static)
- fdb_delete(br, f);
- }
+ hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
+ if (!f->is_static)
+ fdb_delete(br, f);
}
spin_unlock_bh(&br->hash_lock);
}
@@ -377,27 +368,22 @@ void br_fdb_delete_by_port(struct net_bridge *br,
u16 vid,
int do_all)
{
- int i;
+ struct net_bridge_fdb_entry *f;
+ struct hlist_node *tmp;
spin_lock_bh(&br->hash_lock);
- for (i = 0; i < BR_HASH_SIZE; i++) {
- struct hlist_node *h, *g;
+ hlist_for_each_entry_safe(f, tmp, &br->fdb_list, fdb_node) {
+ if (f->dst != p)
+ continue;
- hlist_for_each_safe(h, g, &br->hash[i]) {
- struct net_bridge_fdb_entry *f
- = hlist_entry(h, struct net_bridge_fdb_entry, hlist);
- if (f->dst != p)
+ if (!do_all)
+ if (f->is_static || (vid && f->key.vlan_id != vid))
continue;
- if (!do_all)
- if (f->is_static || (vid && f->vlan_id != vid))
- continue;
-
- if (f->is_local)
- fdb_delete_local(br, p, f);
- else
- fdb_delete(br, f);
- }
+ if (f->is_local)
+ fdb_delete_local(br, p, f);
+ else
+ fdb_delete(br, f);
}
spin_unlock_bh(&br->hash_lock);
}
@@ -433,52 +419,48 @@ int br_fdb_test_addr(struct net_device *dev, unsigned char *addr)
int br_fdb_fillbuf(struct net_bridge *br, void *buf,
unsigned long maxnum, unsigned long skip)
{
- struct __fdb_entry *fe = buf;
- int i, num = 0;
struct net_bridge_fdb_entry *f;
+ struct __fdb_entry *fe = buf;
+ int num = 0;
memset(buf, 0, maxnum*sizeof(struct __fdb_entry));
rcu_read_lock();
- for (i = 0; i < BR_HASH_SIZE; i++) {
- hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
- if (num >= maxnum)
- goto out;
+ hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
+ if (num >= maxnum)
+ break;
- if (has_expired(br, f))
- continue;
+ if (has_expired(br, f))
+ continue;
- /* ignore pseudo entry for local MAC address */
- if (!f->dst)
- continue;
+ /* ignore pseudo entry for local MAC address */
+ if (!f->dst)
+ continue;
- if (skip) {
- --skip;
- continue;
- }
+ if (skip) {
+ --skip;
+ continue;
+ }
- /* convert from internal format to API */
- memcpy(fe->mac_addr, f->addr.addr, ETH_ALEN);
+ /* convert from internal format to API */
+ memcpy(fe->mac_addr, f->key.addr.addr, ETH_ALEN);
- /* due to ABI compat need to split into hi/lo */
- fe->port_no = f->dst->port_no;
- fe->port_hi = f->dst->port_no >> 8;
+ /* due to ABI compat need to split into hi/lo */
+ fe->port_no = f->dst->port_no;
+ fe->port_hi = f->dst->port_no >> 8;
- fe->is_local = f->is_local;
- if (!f->is_static)
- fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
- ++fe;
- ++num;
- }
+ fe->is_local = f->is_local;
+ if (!f->is_static)
+ fe->ageing_timer_value = jiffies_delta_to_clock_t(jiffies - f->updated);
+ ++fe;
+ ++num;
}
-
- out:
rcu_read_unlock();
return num;
}
-static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
+static struct net_bridge_fdb_entry *fdb_create(struct net_bridge *br,
struct net_bridge_port *source,
const unsigned char *addr,
__u16 vid,
@@ -489,16 +471,23 @@ static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
fdb = kmem_cache_alloc(br_fdb_cache, GFP_ATOMIC);
if (fdb) {
- memcpy(fdb->addr.addr, addr, ETH_ALEN);
+ memcpy(fdb->key.addr.addr, addr, ETH_ALEN);
fdb->dst = source;
- fdb->vlan_id = vid;
+ fdb->key.vlan_id = vid;
fdb->is_local = is_local;
fdb->is_static = is_static;
fdb->added_by_user = 0;
fdb->added_by_external_learn = 0;
fdb->offloaded = 0;
fdb->updated = fdb->used = jiffies;
- hlist_add_head_rcu(&fdb->hlist, head);
+ if (rhashtable_lookup_insert_fast(&br->fdb_hash_tbl,
+ &fdb->rhnode,
+ br_fdb_rht_params)) {
+ kmem_cache_free(br_fdb_cache, fdb);
+ fdb = NULL;
+ } else {
+ hlist_add_head_rcu(&fdb->fdb_node, &br->fdb_list);
+ }
}
return fdb;
}
@@ -506,7 +495,6 @@ static struct net_bridge_fdb_entry *fdb_create(struct hlist_head *head,
static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid)
{
- struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
struct net_bridge_fdb_entry *fdb;
if (!is_valid_ether_addr(addr))
@@ -524,7 +512,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
fdb_delete(br, fdb);
}
- fdb = fdb_create(head, source, addr, vid, 1, 1);
+ fdb = fdb_create(br, source, addr, vid, 1, 1);
if (!fdb)
return -ENOMEM;
@@ -548,7 +536,6 @@ int br_fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
const unsigned char *addr, u16 vid, bool added_by_user)
{
- struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
struct net_bridge_fdb_entry *fdb;
bool fdb_modified = false;
@@ -561,7 +548,7 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
source->state == BR_STATE_FORWARDING))
return;
- fdb = fdb_find_rcu(head, addr, vid);
+ fdb = fdb_find_rcu(&br->fdb_hash_tbl, addr, vid);
if (likely(fdb)) {
/* attempt to update an entry for a local interface */
if (unlikely(fdb->is_local)) {
@@ -590,14 +577,13 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
}
} else {
spin_lock(&br->hash_lock);
- if (likely(!fdb_find_rcu(head, addr, vid))) {
- fdb = fdb_create(head, source, addr, vid, 0, 0);
- if (fdb) {
- if (unlikely(added_by_user))
- fdb->added_by_user = 1;
- trace_br_fdb_update(br, source, addr, vid, added_by_user);
- fdb_notify(br, fdb, RTM_NEWNEIGH);
- }
+ fdb = fdb_create(br, source, addr, vid, 0, 0);
+ if (fdb) {
+ if (unlikely(added_by_user))
+ fdb->added_by_user = 1;
+ trace_br_fdb_update(br, source, addr, vid,
+ added_by_user);
+ fdb_notify(br, fdb, RTM_NEWNEIGH);
}
/* else we lose race and someone else inserts
* it first, don't bother updating
@@ -646,7 +632,7 @@ static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
if (fdb->added_by_external_learn)
ndm->ndm_flags |= NTF_EXT_LEARNED;
- if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->addr))
+ if (nla_put(skb, NDA_LLADDR, ETH_ALEN, &fdb->key.addr))
goto nla_put_failure;
if (nla_put_u32(skb, NDA_MASTER, br->dev->ifindex))
goto nla_put_failure;
@@ -657,7 +643,8 @@ static int fdb_fill_info(struct sk_buff *skb, const struct net_bridge *br,
if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
goto nla_put_failure;
- if (fdb->vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16), &fdb->vlan_id))
+ if (fdb->key.vlan_id && nla_put(skb, NDA_VLAN, sizeof(u16),
+ &fdb->key.vlan_id))
goto nla_put_failure;
nlmsg_end(skb, nlh);
@@ -711,54 +698,48 @@ int br_fdb_dump(struct sk_buff *skb,
int *idx)
{
struct net_bridge *br = netdev_priv(dev);
+ struct net_bridge_fdb_entry *f;
int err = 0;
- int i;
if (!(dev->priv_flags & IFF_EBRIDGE))
- goto out;
+ return err;
if (!filter_dev) {
err = ndo_dflt_fdb_dump(skb, cb, dev, NULL, idx);
if (err < 0)
- goto out;
+ return err;
}
- for (i = 0; i < BR_HASH_SIZE; i++) {
- struct net_bridge_fdb_entry *f;
-
- hlist_for_each_entry_rcu(f, &br->hash[i], hlist) {
-
- if (*idx < cb->args[2])
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
+ if (*idx < cb->args[2])
+ goto skip;
+ if (filter_dev && (!f->dst || f->dst->dev != filter_dev)) {
+ if (filter_dev != dev)
goto skip;
-
- if (filter_dev &&
- (!f->dst || f->dst->dev != filter_dev)) {
- if (filter_dev != dev)
- goto skip;
- /* !f->dst is a special case for bridge
- * It means the MAC belongs to the bridge
- * Therefore need a little more filtering
- * we only want to dump the !f->dst case
- */
- if (f->dst)
- goto skip;
- }
- if (!filter_dev && f->dst)
+ /* !f->dst is a special case for bridge
+ * It means the MAC belongs to the bridge
+ * Therefore need a little more filtering
+ * we only want to dump the !f->dst case
+ */
+ if (f->dst)
goto skip;
-
- err = fdb_fill_info(skb, br, f,
- NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- RTM_NEWNEIGH,
- NLM_F_MULTI);
- if (err < 0)
- goto out;
-skip:
- *idx += 1;
}
+ if (!filter_dev && f->dst)
+ goto skip;
+
+ err = fdb_fill_info(skb, br, f,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ RTM_NEWNEIGH,
+ NLM_F_MULTI);
+ if (err < 0)
+ break;
+skip:
+ *idx += 1;
}
+ rcu_read_unlock();
-out:
return err;
}
@@ -766,7 +747,6 @@ out:
static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
const __u8 *addr, __u16 state, __u16 flags, __u16 vid)
{
- struct hlist_head *head = &br->hash[br_mac_hash(addr, vid)];
struct net_bridge_fdb_entry *fdb;
bool modified = false;
@@ -787,7 +767,7 @@ static int fdb_add_entry(struct net_bridge *br, struct net_bridge_port *source,
if (!(flags & NLM_F_CREATE))
return -ENOENT;
- fdb = fdb_create(head, source, addr, vid, 0, 0);
+ fdb = fdb_create(br, source, addr, vid, 0, 0);
if (!fdb)
return -ENOMEM;
@@ -1012,65 +992,60 @@ int br_fdb_delete(struct ndmsg *ndm, struct nlattr *tb[],
int br_fdb_sync_static(struct net_bridge *br, struct net_bridge_port *p)
{
- struct net_bridge_fdb_entry *fdb, *tmp;
- int i;
+ struct net_bridge_fdb_entry *f, *tmp;
int err;
ASSERT_RTNL();
- for (i = 0; i < BR_HASH_SIZE; i++) {
- hlist_for_each_entry(fdb, &br->hash[i], hlist) {
- /* We only care for static entries */
- if (!fdb->is_static)
- continue;
-
- err = dev_uc_add(p->dev, fdb->addr.addr);
- if (err)
- goto rollback;
- }
+ /* the key here is that static entries change only under rtnl */
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
+ /* We only care for static entries */
+ if (!f->is_static)
+ continue;
+ err = dev_uc_add(p->dev, f->key.addr.addr);
+ if (err)
+ goto rollback;
}
- return 0;
+done:
+ rcu_read_unlock();
-rollback:
- for (i = 0; i < BR_HASH_SIZE; i++) {
- hlist_for_each_entry(tmp, &br->hash[i], hlist) {
- /* If we reached the fdb that failed, we can stop */
- if (tmp == fdb)
- break;
-
- /* We only care for static entries */
- if (!tmp->is_static)
- continue;
+ return err;
- dev_uc_del(p->dev, tmp->addr.addr);
- }
+rollback:
+ hlist_for_each_entry_rcu(tmp, &br->fdb_list, fdb_node) {
+ /* We only care for static entries */
+ if (!tmp->is_static)
+ continue;
+ if (tmp == f)
+ break;
+ dev_uc_del(p->dev, tmp->key.addr.addr);
}
- return err;
+
+ goto done;
}
void br_fdb_unsync_static(struct net_bridge *br, struct net_bridge_port *p)
{
- struct net_bridge_fdb_entry *fdb;
- int i;
+ struct net_bridge_fdb_entry *f;
ASSERT_RTNL();
- for (i = 0; i < BR_HASH_SIZE; i++) {
- hlist_for_each_entry_rcu(fdb, &br->hash[i], hlist) {
- /* We only care for static entries */
- if (!fdb->is_static)
- continue;
+ rcu_read_lock();
+ hlist_for_each_entry_rcu(f, &br->fdb_list, fdb_node) {
+ /* We only care for static entries */
+ if (!f->is_static)
+ continue;
- dev_uc_del(p->dev, fdb->addr.addr);
- }
+ dev_uc_del(p->dev, f->key.addr.addr);
}
+ rcu_read_unlock();
}
int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
const unsigned char *addr, u16 vid)
{
struct net_bridge_fdb_entry *fdb;
- struct hlist_head *head;
bool modified = false;
int err = 0;
@@ -1078,10 +1053,9 @@ int br_fdb_external_learn_add(struct net_bridge *br, struct net_bridge_port *p,
spin_lock_bh(&br->hash_lock);
- head = &br->hash[br_mac_hash(addr, vid)];
fdb = br_fdb_find(br, addr, vid);
if (!fdb) {
- fdb = fdb_create(head, p, addr, vid, 0, 0);
+ fdb = fdb_create(br, p, addr, vid, 0, 0);
if (!fdb) {
err = -ENOMEM;
goto err_unlock;