netdev - Re: Patch to netfilter conntrack for secondary connection logging

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Date:   Mon, 22 Aug 2016 11:00:08 +0200
From:   Florian Westphal <fw@...len.de>
To:     Thomas Winter <Thomas.Winter@...iedtelesis.co.nz>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: Patch to netfilter conntrack for secondary connection logging

Thomas Winter <Thomas.Winter@...iedtelesis.co.nz> wrote:
> Hello,
> 
> We are using netfilter to implement a firewall for a router and we had the problem that the ftp data connections were not being logged.
> I did some investigating and found that it is conntrack that is allowing the secondary connection by the ftp helper module.
> I created a patch to enable such logging for any conntrack helper.
> Is this a good change? Or did I miss something really obvious?

It should be possible to log the data connections via

-p tcp -m conntrack --ctstate RELATED -m helper --helper ftp -j (NF)LOG