netdev - Re: [PATCH nf] netfilter: restore default behavior for nf_conntrack

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Message-ID: <Znv-YuDbgwk_1gOX@calendula>
Date: Wed, 26 Jun 2024 13:41:22 +0200
From: Pablo Neira Ayuso <pablo@...filter.org>
To: Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc: Florian Westphal <fw@...len.de>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH nf] netfilter: restore default behavior for
 nf_conntrack_events

Hi Nicolas,

On Tue, Jun 04, 2024 at 03:54:38PM +0200, Nicolas Dichtel wrote:
> Since the below commit, there are regressions for legacy setups:
> 1/ conntracks are created while there are no listener
> 2/ a listener starts and dumps all conntracks to get the current state
> 3/ conntracks deleted before the listener has started are not advertised
> 
> This is problematic in containers, where conntracks could be created early.
> This sysctl is part of unsafe sysctl and could not be changed easily in
> some environments.
> 
> Let's switch back to the legacy behavior.

Maybe it is possible to annotate destroy events in a percpu area if
the conntrack extension is not available. This code used to follow
such approach time ago.