netdev - [patch net-next v2 3/3] arp: flush arp cache on IFF

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Message-Id: <1369729460-28421-4-git-send-email-jiri@resnulli.us>
Date:	Tue, 28 May 2013 10:24:20 +0200
From:	Jiri Pirko <jiri@...nulli.us>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, eric.dumazet@...il.com, timo.teras@....fi,
	kuznet@....inr.ac.ru, jmorris@...ei.org, yoshfuji@...ux-ipv6.org,
	kaber@...sh.net, bhutchings@...arflare.com
Subject: [patch net-next v2 3/3] arp: flush arp cache on IFF_NOARP change

From: Timo Teräs <timo.teras@....fi>

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@....fi>
Signed-off-by: Jiri Pirko <jiri@...nulli.us>
---
 net/ipv4/arp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index b455213..8c8eb40 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1235,12 +1235,18 @@ static int arp_netdev_event(struct notifier_block *this, unsigned long event,
 			    void *ptr)
 {
 	struct net_device *dev = get_netdevice_notifier_info_dev(ptr);
+	struct netdevice_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;
 	}
-- 
1.7.11.7

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