netdev - Re: [PATCH v2] net: gre: use icmp_hdr() to get inner ip header

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Date:	Mon, 27 Jan 2014 20:39:00 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	duanj.fnst@...fujitsu.com
Cc:	dborkman@...hat.com, netdev@...r.kernel.org, pshelar@...ira.com
Subject: Re: [PATCH v2] net: gre: use icmp_hdr() to get inner ip header

From: Duan Jiong <duanj.fnst@...fujitsu.com>
Date: Tue, 28 Jan 2014 11:49:43 +0800

> 
> 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@...fujitsu.com>

Applied and queued up for -stable, thanks.
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