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

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Message-ID: <20131105181923.GB7435@macbook.localnet>
Date:	Tue, 5 Nov 2013 18:19:24 +0000
From:	Patrick McHardy <kaber@...sh.net>
To:	Florian Westphal <fw@...len.de>
Cc:	Jiri Pirko <jiri@...nulli.us>, 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

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.
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