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Date:   Mon, 24 Jan 2022 07:50:41 -0800
From:   Jakub Kicinski <kuba@kernel.org>
To:     Sasha Levin <sashal@kernel.org>
Cc:     linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Ignat Korchagin <ignat@cloudflare.com>,
        Amir Razmjou <arazmjou@cloudflare.com>,
        David Ahern <dsahern@kernel.org>, davem@davemloft.net,
        yoshfuji@linux-ipv6.org, netdev@vger.kernel.org
Subject: Re: [PATCH AUTOSEL 5.10 3/9] sit: allow encapsulated IPv6 traffic
 to be delivered locally
Message-ID: <20220124075041.13c015a6@kicinski-fedora-PC1C0HJN.hsd1.ca.comcast.net>
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On Sat, 22 Jan 2022 19:12:52 -0500 Sasha Levin wrote:
> From: Ignat Korchagin <ignat@cloudflare.com>
> 
> [ Upstream commit ed6ae5ca437d9d238117d90e95f7f2cc27da1b31 ]
> 
> While experimenting with FOU encapsulation Amir noticed that encapsulated IPv6
> traffic fails to be delivered, if the peer IP address is configured locally.

Unless Ignat and Amir need it I'd vote for not backporting this to LTS.
This patch is firmly in the "this configuration was never supported"
category. 5.15 and 5.16 are probably fine.