netdev - Re: [PATCH] ipv4: fix for ip_options_rcv

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Date:	Tue, 15 Nov 2011 01:35:27 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	lw@...fujitsu.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] ipv4: fix for ip_options_rcv_srr() daddr update.

From: Li Wei <lw@...fujitsu.com>
Date: Tue, 15 Nov 2011 13:40:45 +0800

> These days i am doing some ICMP tests and sadly found that wen can't update
> iph->daddr in ip_options_rcv_srr(), It's too early. When some exception
> ocurred later (eg. in ip_forward() when goto sr_failed) we need the ip header
> be identical to the original one as ICMP need it.
> 
> It seems we need rt->rt_dst in ip_forward_options() and ip_forward() instead
> of iph->daddr.

An alternative is to store the calculated destination address somewhere
in the IPCB(skb).
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