netdev - Re: [PATCH] act_nat: the checksum of ICMP doesn't have pseudo header

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Message-ID: <20100730102409.GA8590@gondor.apana.org.au>
Date:	Fri, 30 Jul 2010 18:24:09 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Changli Gao <xiaosuo@...il.com>
Cc:	Jamal Hadi Salim <hadi@...erus.ca>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] act_nat: the checksum of ICMP doesn't have pseudo
	header

On Fri, Jul 30, 2010 at 06:10:19PM +0800, Changli Gao wrote:
>
> Is it really necessary, and I have noticed that netfilter doesn't call
> inet_proto_csum_replace4 in this way.

The checksum update is for the inner IP header.  netfilter does
of course update the checksum, it just doesn't do it here which is
for the outer IP header.

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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