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[net-next,2/6] arp: flush arp cache on IFF_NOARP change

Message ID 1369653376-4731-3-git-send-email-timo.teras@iki.fi
State Deferred, archived
Delegated to: David Miller
Headers show

Commit Message

Timo Teras May 27, 2013, 11:16 a.m. UTC 
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>
---
 net/ipv4/arp.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 247ec19..0a15fb7 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1241,6 +1241,10 @@  static int arp_netdev_event(struct notifier_block *this, unsigned long event,
 		neigh_changeaddr(&arp_tbl, dev);
 		rt_cache_flush(dev_net(dev));
 		break;
+	case NETDEV_CHANGE:
+		if (dev->flags_changed & IFF_NOARP)
+			neigh_changeaddr(&arp_tbl, dev);
+		break;
 	default:
 		break;
 	}