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arp: flush arp cache on IFF_NOARP change

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IFF_NOARP affects what kind of neighbor entries are created
(nud NOARP or nud INCOMPLETE). If the flag changes, flush the arp
cache to refresh all entries.

Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>

v2->v3: shortened notifier_info struct name
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Timo Teräs 2013-05-28 01:30:23 +00:00 committed by David S. Miller
parent be9efd3653
commit 6c8b4e3ff8
1 changed files with 6 additions and 0 deletions
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6
net/ipv4/arp.c
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@ -1235,12 +1235,18 @@ static int arp_netdev_event(struct notifier_block *this, unsigned long event,
void *ptr) void *ptr)
{ {
struct net_device *dev = netdev_notifier_info_to_dev(ptr); struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct netdev_notifier_change_info *change_info;
switch (event) { switch (event) {
case NETDEV_CHANGEADDR: case NETDEV_CHANGEADDR:
neigh_changeaddr(&arp_tbl, dev); neigh_changeaddr(&arp_tbl, dev);
rt_cache_flush(dev_net(dev)); rt_cache_flush(dev_net(dev));
break; break;
case NETDEV_CHANGE:
change_info = ptr;
if (change_info->flags_changed & IFF_NOARP)
neigh_changeaddr(&arp_tbl, dev);
break;
default: default:
break; break;
} }