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Date:   Thu, 13 Oct 2022 00:18:41 +0200
From:   Florian Westphal <fw@strlen.de>
To:     Daniel Xu <dxu@dxuuu.xyz>
Cc:     Martin KaFai Lau <martin.lau@linux.dev>, pablo@netfilter.org,
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Subject: Re: [PATCH bpf-next v4 2/3] selftests/bpf: Add connmark read test
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Daniel Xu <dxu@dxuuu.xyz> wrote:
> > Warning: Extension CONNMARK revision 0 not supported, missing kernel module?
> >   iptables v1.8.8 (nf_tables): Could not fetch rule set generation id:
> > Invalid argument

Martin,

can you give result of

modinfo xt_CONNMARK
and
modinfo nft_compat?

I suspect your kernel lacks nf_tables support.

> >   iptables v1.8.8 (nf_tables): Could not fetch rule set generation id:
> > Invalid argument

Probably a kernel without nftables support?

> So perhaps iptables/nftables suffered a regression somewhere. I'll take
> a closer look tonight / tomorrow morning.

Possible but unlikely, all those tests pass for me.