netdev - Re: no reassembly for outgoing packets on RAW socket

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Message-ID: <alpine.LSU.2.01.1006091713260.30265@obet.zrqbmnf.qr>
Date:	Wed, 9 Jun 2010 17:15:42 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Jiri Olsa <jolsa@...hat.com>, netdev@...r.kernel.org,
	Netfilter Developer Mailing List 
	<netfilter-devel@...r.kernel.org>
Subject: Re: no reassembly for outgoing packets on RAW socket


On Wednesday 2010-06-09 16:16, Patrick McHardy wrote:
>>>> I'd like to be able to sendout a single IP packet with MF flag set.
>>>>
>>>> When using RAW sockets the packet will get stuck in the
>>>> netfilter (NF_INET_LOCAL_OUT nf_defrag_ipv4 reassembly unit)
>>>> and wont ever make it out..
>>>>
>>>> I made a change which bypass the outgoing reassembly for
>>>> RAW sockets, but I'm not sure wether it's too invasive..
>>>>       
>>> That would break reassembly (and thus connection tracking) for cases
>>> where its really intended.
>>>     
>>>> Is there any standard for RAW sockets behaviour?
>>>> Or another way around? :)
>>>>       
>>> You could use the NOTRACK target to bypass connection tracking.
>>
>> I tried the NOTRACK target, but the packet is still going
>> throught reassembly, because the RAW filter has lower priority
>> then the connection track defragmentation..
>
>Right.

Blech. That reminds me of
http://marc.info/?l=netfilter-devel&m=126581823826735&w=2
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