netdev - Re: [PATCH ipsec-next v2] xfrm: allow to avoid copying DSCP during encapsulation

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Message-ID: <20130307074626.GB21448@secunet.com>
Date:	Thu, 7 Mar 2013 08:46:27 +0100
From:	Steffen Klassert <steffen.klassert@...unet.com>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	herbert@...dor.apana.org.au, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH ipsec-next v2] xfrm: allow to avoid copying DSCP during
 encapsulation

On Fri, Feb 22, 2013 at 10:54:54AM +0100, Nicolas Dichtel wrote:
> By default, DSCP is copying during encapsulation.
> Copying the DSCP in IPsec tunneling may be a bit dangerous because packets with
> different DSCP may get reordered relative to each other in the network and then
> dropped by the remote IPsec GW if the reordering becomes too big compared to the
> replay window.
> 
> It is possible to avoid this copy with netfilter rules, but it's very convenient
> to be able to configure it for each SA directly.
> 
> This patch adds a toogle for this purpose. By default, it's not set to maintain
> backward compatibility.
> 
> Field flags in struct xfrm_usersa_info is full, hence I add a new attribute.
> 
> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>

Applied to ipsec-next, thanks!
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