netdev - Re: [PATCH 1/3] xfrm: add incoming interface to selector

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Message-Id: <20111129.190037.1527680744377783412.davem@davemloft.net>
Date:	Tue, 29 Nov 2011 19:00:37 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	ulrich.weber@...hos.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH 1/3] xfrm: add incoming interface to selector

From: Ulrich Weber <ulrich.weber@...hos.com>
Date: Mon, 28 Nov 2011 21:14:50 +0100

> Current implementation only allows to match for outgoing
> interface in xfrm policy database.
> 
> This replaces the user ID (which was never used) with the
> incoming interface, so both interfaces can be matched against.
> 
> Signed-off-by: Ulrich Weber <ulrich.weber@...hos.com>

This isn't safe, because we have no idea if existing users are putting
garbage there.  So your change can break things.

You'll have to add a netlink attribute or similar.
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