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bridge: Add addresses from static fdbs to non-promisc ports

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When a static fdb entry is created, add the mac address
from this fdb entry to any ports that are currently running
in non-promiscuous mode.  These ports need this data so that
they can receive traffic destined to these addresses.
By default ports start in promiscuous mode, so this feature
is disabled.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vlad Yasevich 2014-05-16 09:59:19 -04:00 committed by David S. Miller
parent f3a6ddf152
commit 145beee8d6
1 changed files with 69 additions and 6 deletions
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75
net/bridge/br_fdb.c
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@ -85,8 +85,58 @@ static void fdb_rcu_free(struct rcu_head *head)
kmem_cache_free(br_fdb_cache, ent);
}
/* When a static FDB entry is added, the mac address from the entry is
* added to the bridge private HW address list and all required ports
* are then updated with the new information.
* Called under RTNL.
*/
static void fdb_add_hw(struct net_bridge *br, const unsigned char *addr)
{
int err;
struct net_bridge_port *p, *tmp;
ASSERT_RTNL();
list_for_each_entry(p, &br->port_list, list) {
if (!br_promisc_port(p)) {
err = dev_uc_add(p->dev, addr);
if (err)
goto undo;
}
}
return;
undo:
list_for_each_entry(tmp, &br->port_list, list) {
if (tmp == p)
break;
if (!br_promisc_port(tmp))
dev_uc_del(tmp->dev, addr);
}
}
/* When a static FDB entry is deleted, the HW address from that entry is
* also removed from the bridge private HW address list and updates all
* the ports with needed information.
* Called under RTNL.
*/
static void fdb_del_hw(struct net_bridge *br, const unsigned char *addr)
{
struct net_bridge_port *p;
ASSERT_RTNL();
list_for_each_entry(p, &br->port_list, list) {
if (!br_promisc_port(p))
dev_uc_del(p->dev, addr);
}
}
static void fdb_delete(struct net_bridge *br, struct net_bridge_fdb_entry *f)
{
if (f->is_static)
fdb_del_hw(br, f->addr.addr);
hlist_del_rcu(&f->hlist);
fdb_notify(br, f, RTM_DELNEIGH);
call_rcu(&f->rcu, fdb_rcu_free);
@ -466,6 +516,7 @@ static int fdb_insert(struct net_bridge *br, struct net_bridge_port *source,
return -ENOMEM;
fdb->is_local = fdb->is_static = 1;
fdb_add_hw(br, addr);
fdb_notify(br, fdb, RTM_NEWNEIGH);
return 0;
}
@ -678,13 +729,25 @@ static int fdb_add_entry(struct net_bridge_port *source, const __u8 *addr,
}
if (fdb_to_nud(fdb) != state) {
if (state & NUD_PERMANENT)
fdb->is_local = fdb->is_static = 1;
else if (state & NUD_NOARP) {
if (state & NUD_PERMANENT) {
fdb->is_local = 1;
if (!fdb->is_static) {
fdb->is_static = 1;
fdb_add_hw(br, addr);
}
} else if (state & NUD_NOARP) {
fdb->is_local = 0;
fdb->is_static = 1;
} else
fdb->is_local = fdb->is_static = 0;
if (!fdb->is_static) {
fdb->is_static = 1;
fdb_add_hw(br, addr);
}
} else {
fdb->is_local = 0;
if (fdb->is_static) {
fdb->is_static = 0;
fdb_del_hw(br, addr);
}
}
modified = true;
}