netdev - Re: [PATCH 5/5] netfilter: xt_TEE: have cloned packet travel through Xtables too

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Date:	Thu, 1 Apr 2010 15:44:28 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	netfilter-devel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 5/5] netfilter: xt_TEE: have cloned packet travel through
 Xtables too


On Thursday 2010-04-01 15:22, Patrick McHardy wrote:
>>>> Conntrack loops are prevented by using a dummy conntrack, just as 
>>>> NOTRACK does.
>>> [...]
>>>>  - When the cloned packets gets XFRMed or tunneled, its status switches 
>>>>    from "special" to "plain". Doing policy routing on them does not seem 
>>>>    so far-fetched.
>>> My question was about the case without conntrack.
>> 
>> Hm. Do you have any suggestion in countering a case whereby a user
>> does -I OUTPUT -j TEE without conntrack?
>> 
>> Perhaps making nesting a feature that requires conntrack, such that the 
>> non-CT case can't loop?
>
>If we drop the reentrancy thing, what should work is to prevent
>using loopback as output device and using something similar to
>the recursion counters tunnel devices used to have.

Nah. I'm going to pick a bit from struct skbuff to indicate the
packet was teed so as to avoid that loop.

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