linux-kernel - Re: [PATCH] Periodically flow expire from flow offload tables

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Date:   Tue, 25 Oct 2022 13:05:08 +0200
From:   Pablo Neira Ayuso <pablo@...filter.org>
To:     Michael Lilja <michael.lilja@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Jozsef Kadlecsik <kadlec@...filter.org>,
        Florian Westphal <fw@...len.de>, netdev@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        netfilter-devel@...r.kernel.org, coreteam@...filter.org
Subject: Re: [PATCH] Periodically flow expire from flow offload tables

Hi,

On Sun, Oct 23, 2022 at 07:16:58PM +0200, Michael Lilja wrote:
> When a flow is added to a flow table for offload SW/HW-offload
> the user has no means of controlling the flow once it has
> been offloaded. If a number of firewall rules has been made using
> time schedules then these rules doesn't apply for the already
> offloaded flows. Adding new firewall rules also doesn't affect
> already offloaded flows.
>
> This patch handle flow table retirement giving the user the option
> to at least periodically get the flow back into control of the
> firewall rules so already offloaded flows can be dropped or be
> pushed back to flow offload tables.
> 
> The flow retirement is disabled by default and can be set in seconds
> using sysctl -w net.netfilter.nf_flowtable_retire

How does your ruleset look like? Could you detail your usecase?

Thanks.