netdev - Re: [PATCH ipsec] xfrm: set ipv4 no_pmtu_disc flag only on output sa when direction is set

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Message-ID: <aTJ5UrS_3xPrbtSm@secunet.com>
Date: Fri, 5 Dec 2025 07:18:58 +0100
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>, "David
 S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub
 Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Simon Horman
	<horms@...nel.org>
Subject: Re: [PATCH ipsec] xfrm: set ipv4 no_pmtu_disc flag only on output sa
 when direction is set

On Thu, Nov 27, 2025 at 03:05:55PM +0100, Antony Antony wrote:
> The XFRM_STATE_NOPMTUDISC flag is only meaningful for output SAs, but
> it was being applied regardless of the SA direction when the sysctl
> ip_no_pmtu_disc is enabled. This can unintentionally affect input SAs.
> 
> Limit setting XFRM_STATE_NOPMTUDISC to output SAs when the SA direction
> is configured.
> 
> Reported-by: https://github.com/roth-m

This tag does not make much sense IMO. We neither have a
real name nor an email address to contact.