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Date:   Mon, 17 Aug 2020 19:31:50 +0200
From:   Florian Westphal <fw@strlen.de>
To:     Amiq Nahas <m992493@gmail.com>
Cc:     netfilter-devel@vger.kernel.org
Subject: Re: [iptables] Use ipset with conntrack module
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Amiq Nahas <m992493@gmail.com> wrote:
> Hi Guys,
> 
> Currently only a single ip-address can be specified with these options
> in conntrack module:
> --ctorigsrc address[/mask]
> --ctorigdst address[/mask]
> --ctreplsrc address[/mask]
> --ctrepldst address[/mask]
> 
> I would like to add a new feature into iptables so that multiple
> ip-addresses can be specified at once. I am thinking this can be done
> using ipset.
> 
> Please share your thoughts on how this can be implemented.

This can be done with nftables.  I don't think its worth it to spend
time on this in iptables world.

You would also need to copy-paste reimplement the match  again if you want to
combine it with e.g. network interface.