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Date:   Thu, 27 Feb 2020 20:42:29 +0100
From:   Florian Westphal <fw@strlen.de>
To:     "Serguei Bezverkhi (sbezverk)" <sbezverk@cisco.com>
Cc:     Phil Sutter <phil@nwl.cc>, Florian Westphal <fw@strlen.de>,
        "netfilter-devel@vger.kernel.org" <netfilter-devel@vger.kernel.org>
Subject: Re: Ipv6 address in concatenation
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Serguei Bezverkhi (sbezverk) <sbezverk@cisco.com> wrote:
> Hello,
> 
> I started testing  nfproxy in ipv6 enabled kubernetes cluster and it seems ipv6 address cannot be a part of concatenation expression. Is there a known issue or it is me doing something incorrect?
> From my side the code is the same, I just change ip4_addr to ip6_addr when I build sets.

types are irrelvant for the kernel.  They are ONLY used by the nft tool
so it knows how to format output.

I suspect you need to fix up the generated payload expressions
for ipv6.  Essentially, in the ipv6 case, you have a concatenation

ipv4_addr . ipv4_addr . ip4_addr . ipv4_addr . inet_service

(ipv6 address needs 4 32-bit registers)

i.e., you need to use a different destination register when you store
the tcp/udp port, else you will clobber a part of the ipv6 address.