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Date: Wed, 12 Mar 2025 13:51:42 +0100
From: Florian Westphal <fw@strlen.de>
To: Antonio Ojea <antonio.ojea.garcia@gmail.com>
Cc: Florian Westphal <fw@strlen.de>, netfilter@vger.kernel.org
Subject: Re: netfilter expected behavior for established connections
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Antonio Ojea <antonio.ojea.garcia@gmail.com> wrote:
> Is there some kind of optimization that just directly copies the data
> without going through netfilter hooks or am I doing something wrong?

Looks lke whatever environment you are using has bpf progs in place
that change packet flow, or some other proprietrary modules.