netdev - Re: [PATCH v2] act_nat: fix the wrong checksum when addr isn't in old

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Message-ID: <20100530215322.GA11253@gondor.apana.org.au>
Date:	Mon, 31 May 2010 07:53:22 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	jamal <hadi@...erus.ca>, "David S. Miller" <davem@...emloft.net>,
	netdev@...r.kernel.org
Subject: Re: [PATCH v2] act_nat: fix the wrong checksum when addr isn't in
	old_addr/mask

On Sun, May 30, 2010 at 09:33:22PM +0800, Changli Gao wrote:
>
> Thinking about this topologic:
> 
> client -> DNAT -> router -> server.
> 
> DNAT is used to map a public IP to server's private IP. If a
> DEST_UNREACH ICMP packet is sent out by router, in order to handle
> this ICMP packet correctly, I have to pass it to act_nat.c. How can I
> filter out the other packets? By inspecting the inner IP destination
> address of this ICMP packet? Maybe I can use u32 with complicate
> parameters.

You should filter out all the non-ICMP packets, just like you
do here.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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