netdev - Re: [PATCH ipsec-next v3] udpencap: Remove Obsolete UDP_ENCAP_ESPINUDP_NON

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Date: Mon, 22 Apr 2024 06:47:35 +0200
From: Steffen Klassert <steffen.klassert@...unet.com>
To: Antony Antony <antony.antony@...unet.com>
CC: Herbert Xu <herbert@...dor.apana.org.au>, <netdev@...r.kernel.org>,
	Florian Westphal <fw@...len.de>, Willem de Bruijn
	<willemdebruijn.kernel@...il.com>, "David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>, Jakub Kicinski <kuba@...nel.org>, "Paolo
 Abeni" <pabeni@...hat.com>, Andreas Gruenbacher <agruenba@...hat.com>,
	<devel@...ux-ipsec.org>, Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH ipsec-next v3] udpencap: Remove Obsolete
 UDP_ENCAP_ESPINUDP_NON_IKE Support

On Fri, Apr 12, 2024 at 01:50:44PM +0200, Antony Antony wrote:
> The UDP_ENCAP_ESPINUDP_NON_IKE mode, introduced into the Linux kernel
> in 2004 [2], has remained inactive and obsolete for an extended period.
> 
> This mode was originally defined in an early version of an IETF draft
> [1] from 2001. By the time it was integrated into the kernel in 2004 [2],
> it had already been replaced by UDP_ENCAP_ESPINUDP [3] in later
> versions of draft-ietf-ipsec-udp-encaps, particularly in version 06.
> 
> Over time, UDP_ENCAP_ESPINUDP_NON_IKE has lost its relevance, with no
> known use cases.
> 
> With this commit, we remove support for UDP_ENCAP_ESPINUDP_NON_IKE,
> simplifying the codebase and eliminating unnecessary complexity.
> Kernel will return an error -ENOPROTOOPT if the userspace tries to set
> this option.
> 
> References:
> [1] https://datatracker.ietf.org/doc/html/draft-ietf-ipsec-udp-encaps-00.txt
> 
> [2] Commit that added UDP_ENCAP_ESPINUDP_NON_IKE to the Linux historic
>     repository.
> 
>     Author: Andreas Gruenbacher <agruen@...e.de>
>     Date: Fri Apr 9 01:47:47 2004 -0700
> 
>    [IPSEC]: Support draft-ietf-ipsec-udp-encaps-00/01, some ipec impls need it.
> 
> [3] Commit that added UDP_ENCAP_ESPINUDP to the Linux historic
>     repository.
> 
>     Author: Derek Atkins <derek@...fp.com>
>     Date: Wed Apr 2 13:21:02 2003 -0800
> 
>     [IPSEC]: Implement UDP Encapsulation framework.
> 
> Signed-off-by: Antony Antony <antony.antony@...unet.com>

Applied, thanks Antony!