netdev - Re: [PATCH] NETFILTER module xt_hmark new target for HASH MARK

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Message-ID: <4D4BFC68.2070306@trash.net>
Date:	Fri, 04 Feb 2011 14:17:28 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Pablo Neira Ayuso <pablo@...filter.org>
CC:	Hans Schillstrom <hans.schillstrom@...csson.com>,
	"jengelh@...ozas.de" <jengelh@...ozas.de>,
	"netfilter-devel@...r.kernel.org" <netfilter-devel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"hans@...illstrom.com" <hans@...illstrom.com>
Subject: Re: [PATCH] NETFILTER module xt_hmark new target for HASH MARK

On 03.02.2011 17:01, Pablo Neira Ayuso wrote:
> On 03/02/11 16:42, Pablo Neira Ayuso wrote:
>> On 03/02/11 15:23, Hans Schillstrom wrote:
>>> On Thu, 2011-02-03 at 14:51 +0100, Pablo Neira Ayuso wrote:
>>>> On 03/02/11 14:34, Hans Schillstrom wrote:
>>>> this assumption is not valid in NAT handlings.
>>>
>>> That's true, because I want to avoid conntrack
>>>
>>>> If you want consistent hashing with NAT handlings you'll have to make
>>>> this stateful and use the conntrack source and reply directions of the
>>>> original tuples (thus making it stateful). That may be a problem because
>>>> some people may want to use this without enabling connection tracking.
>>>
>>> What about a compilation switch or a sysctl ?
>>
>> or better some option for iptables.
> 
> Hm, this is actually not straight forward to implement, you'll have to
> use hook functions to avoid the module dependencies with conntrack and
> that's pretty annoying.

Actually it should be pretty simple since nf_ct_get() doesn't have any
module dependencies. If it succeeds, use the addresses from the tuples,
otherwise fall back to getting them directly from the packet.
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