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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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.
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html