netdev - Re: [PATCH net] ip_tunnel: Don't allow to add the same tunnel multiple times.

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Date:	Mon, 22 Sep 2014 16:45:56 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	steffen.klassert@...unet.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net] ip_tunnel: Don't allow to add the same tunnel
 multiple times.

From: Steffen Klassert <steffen.klassert@...unet.com>
Date: Mon, 22 Sep 2014 09:11:08 +0200

> When we try to add an already existing tunnel, we don't return
> an error. Instead we continue and call ip_tunnel_update().
> This means that we can change existing tunnels by adding
> the same tunnel multiple times. It is even possible to change
> the tunnel endpoints of the fallback device.
> 
> We fix this by returning an error if we try to add an existing
> tunnel.
> 
> Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
> ---
> 
> I was not able to find a commit that introduced this bug.
> Looks like ipip and ip_gre had similar bugs already with
> the initial git commit.

I'm not so sure about this, perhaps the behavior of being able to
change a configuration using an ADD call is intentional?
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