netdev - Re: [RFC PATCH net-next 0/7 v2]IPv6:netfilter: defragment

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Message-ID: <4BAB2121.2030503@plouf.fr.eu.org>
Date:	Thu, 25 Mar 2010 09:38:57 +0100
From:	Pascal Hambourg <pascal.mail@...uf.fr.eu.org>
To:	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>
CC:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	Patrick McHardy <kaber@...sh.net>,
	Shan Wei <shanwei@...fujitsu.com>,
	David Miller <davem@...emloft.net>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Yasuyuki KOZAKAI <yasuyuki.kozakai@...hiba.co.jp>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	netfilter-devel@...r.kernel.org
Subject: Re: [RFC PATCH net-next 0/7 v2]IPv6:netfilter: defragment

Hello,

Jozsef Kadlecsik a écrit :
> 
> On Wed, 24 Mar 2010, YOSHIFUJI Hideaki wrote:
> 
>>> In this case without conntrack, IPv6 would send an ICMPv6 message,
>>> so in my opinion the transparent thing to do would be to still send
>>> them. Of course only if reassembly is done on an end host.
>> Well, no.  conntrack should just forward even uncompleted fragments
>> to next process (e.g. core ipv6 code), and then the core would send
>> ICMP error back.  ICMP should be sent by the core ipv6 code according
>> to decision of itself, not according to netfilter.
> 
> But what state could be associated by conntrack to the uncompleted 
> fragments but the INVALID state? In consequence, in any sane setup, the 
> uncompleted fragments will be dropped silently by a filter table rule
> and no ICMP error message will be sent back.

AFAIK, in the IPv4 stack the reassembly takes place before the INPUT
chains (NF_IP_LOCAL_IN hook). Is it different in the IPv6 stack ?
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