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Commit 6c8b4e3f authored by Timo Teräs's avatar Timo Teräs Committed by David S. Miller
Browse files

arp: flush arp cache on IFF_NOARP change 



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: default avatarTimo Teräs <timo.teras@iki.fi>
Signed-off-by: default avatarJiri Pirko <jiri@resnulli.us>

v2->v3: shortened notifier_info struct name
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent be9efd36

net/ipv4/arp.c

+6 −0
Original line number Diff line number Diff line
@@ -1235,12 +1235,18 @@ static int arp_netdev_event(struct notifier_block *this, unsigned long event, 
			    void *ptr)

{

	struct net_device *dev = netdev_notifier_info_to_dev(ptr);

	struct netdev_notifier_change_info *change_info;



	switch (event) {

	case NETDEV_CHANGEADDR:

		neigh_changeaddr(&arp_tbl, dev);

		rt_cache_flush(dev_net(dev));

		break;

	case NETDEV_CHANGE:

		change_info = ptr;

		if (change_info->flags_changed & IFF_NOARP)

			neigh_changeaddr(&arp_tbl, dev);

		break;

	default:

		break;

	}