netdev - Re: [net-next] netfiler: conntrack: Add the option to set ct tcp flag

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Date:   Mon, 9 Nov 2020 11:54:58 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     nusiddiq@...hat.com
Cc:     dev@...nvswitch.org, netdev@...r.kernel.org,
        Pravin B Shelar <pshelar@....org>,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        netfilter-devel@...r.kernel.org
Subject: Re: [net-next] netfiler: conntrack: Add the option to set ct tcp
 flag - BE_LIBERAL per-ct basis.

On Mon,  9 Nov 2020 12:59:30 +0530 nusiddiq@...hat.com wrote:
> From: Numan Siddique <nusiddiq@...hat.com>
> 
> Before calling nf_conntrack_in(), caller can set this flag in the
> connection template for a tcp packet and any errors in the
> tcp_in_window() will be ignored.
> 
> A helper function - nf_ct_set_tcp_be_liberal(nf_conn) is added which
> sets this flag for both the directions of the nf_conn.
> 
> openvswitch makes use of this feature so that any out of window tcp
> packets are not marked invalid. Prior to this there was no easy way
> to distinguish if conntracked packet is marked invalid because of
> tcp_in_window() check error or because it doesn't belong to an
> existing connection.
> 
> An earlier attempt (see the link) tried to solve this problem for
> openvswitch in a different way. Florian Westphal instead suggested
> to be liberal in openvswitch for tcp packets.
> 
> Link: https://patchwork.ozlabs.org/project/netdev/patch/20201006083355.121018-1-nusiddiq@redhat.com/
> 
> Suggested-by: Florian Westphal <fw@...len.de>
> Signed-off-by: Numan Siddique <nusiddiq@...hat.com>

Please repost Ccing Pablo & netfilter-devel.