netdev - Re: [patch net-next 2/3] netfilter: ip6_tables: use reasm skb for matching

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Date:	Tue, 5 Nov 2013 19:21:26 +0100
From:	Jiri Pirko <jiri@...nulli.us>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Florian Westphal <fw@...len.de>, netdev@...r.kernel.org,
	davem@...emloft.net, pablo@...filter.org,
	netfilter-devel@...r.kernel.org, yoshfuji@...ux-ipv6.org,
	kadlec@...ckhole.kfki.hu, mleitner@...hat.com,
	kuznet@....inr.ac.ru, jmorris@...ei.org, wensong@...ux-vs.org,
	horms@...ge.net.au, ja@....bg, edumazet@...gle.com,
	pshelar@...ira.com, jasowang@...hat.com,
	alexander.h.duyck@...el.com, coreteam@...filter.org
Subject: Re: [patch net-next 2/3] netfilter: ip6_tables: use reasm skb for
 matching

Tue, Nov 05, 2013 at 07:19:24PM CET, kaber@...sh.net wrote:
>On Tue, Nov 05, 2013 at 04:39:21PM +0100, Florian Westphal wrote:
>> Jiri Pirko <jiri@...nulli.us> wrote:
>> > Tue, Nov 05, 2013 at 02:41:19PM CET, kaber@...sh.net wrote:
>> > >executing the rules on the reassembled packet multiple times, one
>> > >for each fragment.
>> > 
>> [..]
>> > End even though, the matching is now done for each fragment skb anyway. The
>> > change is only to do it on different skb. I see no erformance or any
>> > other problem in that.
>> 
>> One problem that comes to mind is that nfacct or quota match will
>> now account num_of_fragments * length_of_reassemled_skb bytes.
>
>indeed. The easiest way to fix all this (and, btw, also the
>pskb_expand_head() oops which is currently reported by multiple people)
>is to get rid of all the fragmentation handling and simply use the
>reassembled skb.

Okay. That will resolve the skb->sk rewrite problem as well. I will
prepare a patch. 
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