netdev - Re: [PATCH 1/2] IPv6: conntrack: Use protocol-related initialization routine to initial queues of IPv6 connection track

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Date:	Tue, 26 Jan 2010 13:46:46 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Shan Wei <shanwei@...fujitsu.com>
CC:	David Miller <davem@...emloft.net>, yasuyuki.kozakai@...hiba.co.jp,
	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 1/2] IPv6: conntrack: Use protocol-related initialization
 routine to initial queues of IPv6 connection track

Shan Wei wrote:
> David Miller wrote, at 01/26/2010 03:32 PM:
>> From: Shan Wei <shanwei@...fujitsu.com>
>> Date: Tue, 26 Jan 2010 10:31:10 +0800
>>
>>> IPv6 connection track and IPv6 stack separately use a different queue to 
>>> manage received fragments. The former uses nf_ct_frag6_queue structure, 
>>> the latter uses frag_queue structure.
>>>
>>> When creating new queue for IPv6 connection track, ip6_frag_init() 
>>> that belongs to IPv6 stack is called to initial nf_ct_frag6_queue structure. 
>>> This broken the saddr&daddr member in nf_ct_frag6_queue, and then hash value 
>>> generated by nf_hashfn() is not equal with that generated by fq_find(). 
>>> So, a new received fragment can't be inserted to right queue.
>>>  
>>> The patch fixes the bug with protocol-related initialization routine.
>>> The patch-set have been tested.
>>>
>>> Signed-off-by: Shan Wei <shanwei@...fujitsu.com>
>> This breakage was recently introduced by:
>>
>> commit 0b5ccb2ee250136dd7385b1c7da28417d0d4d32d
>> Author: Patrick McHardy <kaber@...sh.net>
>> Date:   Tue Dec 15 16:59:18 2009 +0100
>>
>>     ipv6: reassembly: use seperate reassembly queues for conntrack and local delivery
> 
> Yes, this patch adds user member to frag_queue structure，but not to nf_ct_frag6_queue structure.

Oops, sorry. Not sure why I missed this, I've successfully
tested that change multiple times.

> Please ignore the patch-set. 
> Can you apply the following patch(bug-fix) to your net-tree?
> 
> --
> [PATCH]IPv6: conntrack: Add member of user to  nf_ct_frag6_queue structure
> 
> The commit 0b5ccb2(title:ipv6: reassembly: use seperate reassembly queues for 
> conntrack and local delivery) has broken the saddr&&daddr member of 
> nf_ct_frag6_queue when creating new queue.  And then hash value
> generated by nf_hashfn() was not equal with that generated by fq_find(). 
> So, a new received fragment can't be inserted to right queue.
> 
> The patch fixes the bug with adding member of user to nf_ct_frag6_queue structure.
> 
> Signed-off-by: Shan Wei <shanwei@...fujitsu.com>

Acked-by: Patrick McHardy <kaber@...sh.net>
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