commit c0c0c50ff7c3e331c90bab316d21f724fb9e1994
author Duan Jiong <duanj.fnst@cn.fujitsu.com> Tue Jan 28 11:49:43 2014 +0800
committer David S. Miller <davem@davemloft.net> Mon Jan 27 20:38:26 2014 -0800
tree 8890196c79356a199374c1e54ef6b61b1043545b
parent 3d9667a9e1e463c107cb47a810ef7e85d9a31e62

net: gre: use icmp_hdr() to get inner ip header

When dealing with icmp messages, the skb->data points the
ip header that triggered the sending of the icmp message.

In gre_cisco_err(), the parse_gre_header() is called, and the
iptunnel_pull_header() is called to pull the skb at the end of
the parse_gre_header(), so the skb->data doesn't point the
inner ip header.

Unfortunately, the ipgre_err still needs those ip addresses in
inner ip header to look up tunnel by ip_tunnel_lookup().

So just use icmp_hdr() to get inner ip header instead of skb->data.

Signed-off-by: Duan Jiong <duanj.fnst@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>