tree 9aabbb2dac62f2e3ddcb8347da94df76f8976da7
parent c839d30a41dd92eb32d7fcfa2b4e99042fc64bf2
author Timo Teräs <timo.teras@iki.fi> 1267588873 +0000
committer David S. Miller <davem@davemloft.net> 1267692832 -0800

gre: fix hard header destination address checking

ipgre_header() can be called with zero daddr when the gre device is
configured as multipoint tunnel and still has the NOARP flag set (which is
typically cleared by the userspace arp daemon).  If the NOARP packets are
not dropped, ipgre_tunnel_xmit() will take rt->rt_gateway (= NBMA IP) and
use that for route look up (and may lead to bogus xfrm acquires).

The multicast address check is removed as sending to multicast group should
be ok.  In fact, if gre device has a multicast address as destination
ipgre_header is always called with multicast address.

Signed-off-by: Timo Teras <timo.teras@iki.fi>
Signed-off-by: David S. Miller <davem@davemloft.net>