netdev - Re: [PATCH 1/9] netfilter: nf_nat: support user-specified SNAT rules in LOCAL

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Date:	Fri, 02 Jul 2010 16:07:16 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Jan Engelhardt <jengelh@...ozas.de>
CC:	davem@...emloft.net, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH 1/9] netfilter: nf_nat: support user-specified SNAT rules
 in LOCAL_IN

Jan Engelhardt wrote:
> On Friday 2010-07-02 14:35, Patrick McHardy wrote:
>   
>>>> Sure they do, if they are destined for the host itself. I'm not sure
>>>> what's so hard to understand about this patch, you have f.i. multiple
>>>> tunnels using the same remote network, on INPUT and POSTROUTING you SNAT
>>>> them to seperate networks based on criteria like the network device or
>>>> the IPsec tunnel to be able to distinguish them.
>>>>    
>>>>         
>>> But they are already distinguishable by the ctmark that is applied
>>> to these connections to do routing of the reply, are they not?
>>>  
>>>       
>> Its not (only) about routing, you simply can't have two connections using
>> the same identity.
>>     
>
> Which is why the zone thing is added.
>   

I'm not talking about conntrack at all. A connection needs
a unique identity. Just look at the socket lookup code.

> Ah, but I now see that you need to select a zone for it first.. touché.
>
> Still this SNAT-on-INPUT leaves a second taste. Adding another address 
> to the tunnel master and using DNAT-on-PREROUTING for local deliveries 
> would have also made the connections unambiguous

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