netdev - Re[2]: [PATCH 2/3] ipvs: Fix faulty IPv6 extension header handling in IPVS

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Message-ID: <mdaatbj.ca5ac4e44d852a03ede087a5ed658cd9@obelix.schillstrom.com>
Date:	Mon, 27 Aug 2012 12:55:14 +0200 (CEST)
From:	"Hans Schillstrom" <hans@...illstrom.com>
To:	"Patrick McHardy" <kaber@...sh.net>
Cc:	"Jesper Dangaard Brouer" <brouer@...hat.com>,
	netdev@...r.kernel.org, lvs-devel@...r.kernel.org,
	"Julian Anastasov" <ja@....bg>,
	"Simon Horman" <horms@...ge.net.au>,
	"Wensong Zhang" <wensong@...ux-vs.org>,
	netfilter-devel@...r.kernel.org
Subject: Re[2]:  [PATCH 2/3] ipvs: Fix faulty IPv6 extension header 
	handling in IPVS

>
>On Mon, 20 Aug 2012, Jesper Dangaard Brouer wrote:
>
>> Based on patch from: Hans Schillstrom
>>
>> IPv6 headers must be processed in order of appearance,
>> neither can it be assumed that Upper layer headers is first.
>> If anything else than L4 is the first header IPVS will throw it.
>>
>> IPVS will write SNAT & DNAT modifications at a fixed pos which
>> will corrupt the message. Proper header position must be found
>> before writing modifying packet.
>>
>> This patch contains a lot of API changes.  This is done, to avoid
>> the costly scan of finding the IPv6 headers, via ipv6_find_hdr().
>> Finding the IPv6 headers is done as early as possible, and passed
>> on as a pointer "struct ip_vs_iphdr *" to the affected functions.
>
>How about we change netfilter to set up the skb's transport header
>at an early time so we can avoid all (most of) these header scans
>in netfilter?

I think that would be great, maybe it should be global i.e. not only a netfilter issue.

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