netdev - Re: xfrm: Forbid state updates from changing encap type

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Message-ID: <20171231074919.otq37lsjlp6xzthi@gauss3.secunet.de>
Date:   Sun, 31 Dec 2017 08:49:19 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
CC:     <netdev@...r.kernel.org>
Subject: Re: xfrm: Forbid state updates from changing encap type

On Tue, Dec 26, 2017 at 05:34:44PM +1100, Herbert Xu wrote:
> Currently we allow state updates to competely replace the contents
> of x->encap.  This is bad because on the user side ESP only sets up
> header lengths depending on encap_type once when the state is first
> created.  This could result in the header lengths getting out of
> sync with the actual state configuration.
> 
> In practice key managers will never do a state update to change the
> encapsulation type.  Only the port numbers need to be changed as the
> peer NAT entry is updated.
> 
> Therefore this patch adds a check in xfrm_state_update to forbid
> any changes to the encap_type.
> 
> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>

Applied to the ipsec tree, thanks Herbert!