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path: root/main/linux-grsec/0002-arp-flush-arp-cache-on-IFF_NOARP-change.patch
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From 36fbd62c47d800705d9989c69994359711514165 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Ter=C3=A4s?= <timo.teras@iki.fi>
Date: Thu, 23 May 2013 11:43:55 +0300
Subject: [PATCH 2/6] arp: flush arp cache on IFF_NOARP change
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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(+)

diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index fea4929..2a06ecf 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -1226,6 +1226,10 @@ 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;
 	}
-- 
1.8.2.3