netdev - Re: [PATCH ipsec] xfrm: don't check the default policy if the policy allows the packet

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Date:   Wed, 12 Apr 2023 10:55:25 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Sabrina Dubroca <sd@...asysnail.net>
CC:     <netdev@...r.kernel.org>,
        Christian Langrock <christian.langrock@...unet.com>,
        Antony Antony <antony.antony@...unet.com>
Subject: Re: [PATCH ipsec] xfrm: don't check the default policy if the policy
 allows the packet

On Tue, Apr 04, 2023 at 03:12:16PM +0200, Sabrina Dubroca wrote:
> The current code doesn't let a simple "allow" policy counteract a
> default policy blocking all incoming packets:
> 
>     ip x p setdefault in block
>     ip x p a src 192.168.2.1/32 dst 192.168.2.2/32 dir in action allow
> 
> At this stage, we have an allow policy (with or without transforms)
> for this packet. It doesn't matter what the default policy says, since
> the policy we looked up lets the packet through. The case of a
> blocking policy is already handled separately, so we can remove this
> check.
> 
> Fixes: 2d151d39073a ("xfrm: Add possibility to set the default to block if we have no policy")
> Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>

Applied, thanks a lot Sabrina!