netdev - Re: [PATCH] ip6tables: use skb->len for accounting

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Message-ID: <4C498172.40404@trash.net>
Date:	Fri, 23 Jul 2010 13:48:02 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Changli Gao <xiaosuo@...il.com>
CC:	Jan Engelhardt <jengelh@...ozas.de>,
	"David S. Miller" <davem@...emloft.net>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>,
	"Pekka Savola (ipv6)" <pekkas@...core.fi>,
	James Morris <jmorris@...ei.org>,
	Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] ip6tables: use skb->len for accounting

On 23.07.2010 08:38, Changli Gao wrote:
> On Fri, Jul 23, 2010 at 2:16 PM, Jan Engelhardt <jengelh@...ozas.de> wrote:
>>
>>
>> I wonder how this fares with trailing padding or data, like, when
>> you have a standard v4/v6 packet created in a raw socket, and append
>> a bunch of \0s to it.
>>
>>
> 
> For the packets received, ip_rcv, ipv6_rcv and bridge all call
> pskb_trim_rcsum before feeding them to netfilter. The raw packets are
> sent via dev_queue_xmit(), and they don't pass through the output path
> of netfilter.

That's not true, raw packets also pass through netfilter. However
I agree that this patch makes sense to properly deal with jumbo
frames, but you should also update xt_length for consistency.
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