netdev - Re: [PATCH v2 ipsec 2/2] xfrm: Ensure policy checked for nested ESP tunnels

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Date:   Thu, 22 Sep 2022 08:27:10 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Benedict Wong <benedictwong@...gle.com>
CC:     <netdev@...r.kernel.org>, <nharold@...gle.com>,
        <lorenzo@...gle.com>
Subject: Re: [PATCH v2 ipsec 2/2] xfrm: Ensure policy checked for nested ESP
 tunnels

On Fri, Sep 16, 2022 at 10:44:42PM -0700, Benedict Wong wrote:
> Thanks for the response; apologies for taking a while to re-patch this
> and verify.
> 
> I think this /almost/ does what we need to. I'm still seeing v6 ESP in v6
> ESP tunnels failing; I think it's due to the fact that the IPv6 ESP
> codepath does not trigger policy checks in the receive codepath until it
> hits the socket, or changes namespace.
> Perhaps if we verify policy unconditionally in xfrmi_rcv_cb? combined
> with your change above, this should ensure IPv6 ESP also checks policies,
> and inside that clear the secpath?

Hm, do you know why this is different to IPv4? IPv4 and IPv6 should
do the same regarding to policy checks.