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Date: Mon, 14 Sep 2026 00:13:47 +0200
From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Hauke Mehrtens <hauke@hauke-m.de>
Cc: stable@vger.kernel.org,
	"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
	netfilter-devel@vger.kernel.org
Subject: Re: network flow offloading broken in 6.18.45+
Message-ID: <aqcgG0y-nYz4DWz3@chamomile>
References: <7dfa42f6-64c1-4084-bfea-d57500c245cf@hauke-m.de>
 <aqcfvRE3aHoAx8s7@chamomile>
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In-Reply-To: <aqcfvRE3aHoAx8s7@chamomile>

On Mon, Sep 14, 2026 at 12:12:16AM +0200, Pablo Neira Ayuso wrote:
> Hi Hauke,
> 
> On Wed, Sep 09, 2026 at 06:29:50PM +0200, Hauke Mehrtens wrote:
> > Hi,
> > 
> > flow offloading is currently broken in Linux 6.18.45.
> > 
> > Since the backport of commit b5964aac51e0 ("netfilter: flowtable:
> > consolidate xmit path") to Linux 6.18.45. This is happening in a router with
> > traffic from wifi to the Ethernet device when mac80211 returns -EOPNOTSUPP.
> > 
> > Upstream fixed it in 871df5007eda ("netfilter: flowtable: bail out if
> > forward path cannot be discovered") by not offloading the flow at all.
> > backporting this change looks more complicated.
> > 
> > This cam up in a discussion in an OpenWrt PR:
> > https://github.com/openwrt/openwrt/pull/24800
> > 
> > An LLM suggested this change: https://github.com/openwrt/openwrt/pull/24800/changes/394d741e6e76ecd172dbbf1d9ba171e378211734
> 
> Patch went away.
> 
> > It seams to work, but I do not understand this part of the code god enough
> > to judge if this is correct.
> 
> Could you attach the patch to this email for review?

I've found it :)

https://github.com/openwrt/openwrt/commit/d2b53b8043e17087b877bfc2335cbba87dffb4e0