Re: [MEXT] New RFC3775bis issue "BU de-registration race condition"?

[Hesham Soliman <hesham at elevatemobile.com>]

On 14/10/08 7:59 PM, "Kilian Weniger" <Kilian.Weniger at eu.panasonic.com>
wrote:

> Hi all,
> 
> I think there is a possible race condition issue in RFC3775, which
> should be considered for RFC3775bis.
> 
> The scenario is as follows: A MN returns home and sends a BU
> de-registration. Once the HA receives the de-registration, it deletes
> the BCE for the MN according to RFC3775. Now assume that just before
> returning home, the MN has sent a BU (either refresh BU or BU with new
> CoA due to handover) and that the BU is delayed and is received by the
> HA after the BU de-registration.
> 
> Since the HA has just deleted the MN's BCE due to the received BU
> de-registration, the HA would accept the delayed BU without SN check

=> How can it accept it without an IPsec SA? If the SA is already there it
won't accept it. If the SA is no longer there then it won't accept it
either. 

Hesham


and
> create a new BCE with a CoA pertaining to the previous location of the
> MN. This results in wrong forwarding state in the HA and hence packet
> loss for the MN till the MN sends a new BU (next handover of the MN or
> the lifetime of the BCE expires).
> 
> A simple mitigation for this problem could be that the HA keeps some BCE
> information (at least HoA and SN) for some time after receiving a BU
> de-registration. This would enable the HA to identify a delayed BU as a
> delayed one based on the SN.
> 
> Comments?
> 
> BR,
> 
> Kilian
> 
> --------------------------------------------
> Dr. Kilian Weniger
> Panasonic R&D Center Germany
> Monzastr. 4c, 63225 Langen, Germany
> phone:  +49 (0)6103 766 137
> fax:    +49 (0)6103 766 166
> e-mail: kilian.weniger at eu.panasonic.com
> --------------------------------------------
> 
> 
> Panasonic R&D Center Germany GmbH
> 63225 Langen, Hessen, Germany
> Reg: AG Offenbach (Hessen) HRB 33974
> Managing Director: Thomas Micke
> 
> 
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