From: Eric Dumazet <edumazet@google.com>
Date: Wed, 29 Jul 2015 10:01:41 +0000 (+0200)
Subject: ipv6: flush nd cache on IFF_NOARP change
X-Git-Tag: omap-for-v4.3/fixes-merge-window~158^2~9
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c8507fb235bea3314a02a67ddda0d4e6cf01fa78;p=pandora-kernel.git

ipv6: flush nd cache on IFF_NOARP change

This patch is the IPv6 equivalent of commit
6c8b4e3ff81b ("arp: flush arp cache on IFF_NOARP change")

Without it, we keep buggy neighbours in the cache, with destination
MAC address equal to our own MAC address.

Tested:
 tcpdump -i eth0 -s 0 ip6 -n -e &
 ip link set dev eth0 arp off
 ping6 remote   // sends buggy frames
 ip link set dev eth0 arp on
 ping6 remote   // should work once kernel is patched

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Mario Fanelli <mariofanelli@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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