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Date:   Thu, 31 Oct 2019 20:12:19 +0100
From:   Florian Westphal <fw@strlen.de>
To:     Daniel Huhardeaux <tech@tootai.net>
Cc:     Netfilter list <netfilter-devel@vger.kernel.org>
Subject: Re: Nat redirect using map
Message-ID: <20191031191219.GL876@breakpoint.cc>
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Daniel Huhardeaux <tech@tootai.net> wrote:
> Hi,
> 
> I have a map like this
> 
> map redirect_tcp {
>                 type inet_service : inet_service
>                 flags interval
>                 elements = { 12345 : 12345, 36025 : smtp }
>         }
> 
> and want to use nat redirect but it fail with unexpecting to, expecting EOF
> or semicolon. Here is the rule
> 
> nft add rule ip nat prerouting iif eth0 tcp dport map @redirect_tcp redirect
> to @redirect_tcp

This should work:
nft add rule ip nat prerouting iif eth0 ip protocol tcp redirect to : tcp dport map @redirect_tcp

> Other: when using dnat for forwarding, should I take care of forward rules ?
> 
> Example for this kind of rule from wiki:
> 
> nft add rule nat prerouting iif eth0 tcp dport { 80, 443 } dnat
> 192.168.1.120

You mean auto-accept dnatted connections? Try "ct status dnat accept"