[Hipsec] HIP parameters critical flag

Robert Moskowitz <rgm@htt-consult.com> Tue, 12 January 2010 16:01 UTC

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Date: Tue, 12 Jan 2010 07:58:23 -0800
From: Robert Moskowitz <rgm@htt-consult.com>
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Subject: [Hipsec] HIP parameters critical flag
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Tobias and I have been working away on 5201-bis and of course one new 
thing is the HIH parameter that needs a number...

-------- Original Message --------
Subject: 	Fwd: HIP parameters critical flag
Date: 	Tue, 12 Jan 2010 11:49:51 +0100
From: 	Tobias Heer <tobias.heer@gmx.de>
To: 	Robert Moskowitz <rgm@htt-consult.com>



Hello Bob,

>  Am 11.01.2010 um 21:54 schrieb Robert Moskowitz:
>
>>  So for defining the new HIH parmeter, I am looking at 5.2.1 and it talks about the critical flag.  Oops, of course HIH is critical.  So I search for critical in the other parameters and NONE mention being critical.
>>
>>  What am I missing here???
>>
>
>  the C bit is the lowest order bit of the parameter number. All parameters with odd numbers (e.g. Puzzle, Solution, DH ...) are critical.

We are going to clearify this in 5201-bis and explicitly state what is a critical parameter.

>>  Also what is the type value for HIH to get it in the 'right' place in the parameters?
>>
>  The HIH definitely needs to be in the signed part of the packet. I would consider it a parameter that is related to the BEX. The appropriate parameter range would be 0-1023. We probably need to check the HIP extensions to find a free number in this range. I'll do this tomorrow.
>

I looked at the parameter numbers and I would suggest number 715 because is located behind 705/Host_ID and it is therefore close to it in the actual HIP control packet.

I checked the following things for all active HIP drafts and documents that are accessible from the HIP WG status page:
* There is no mentioning of the parameter number 715
* The next parameter higher than 705/HOST_ID is 768/Cert (RFC5201 and draft-ietf-hip-cert-02.txt)
   - there won't be any parameter between HOST_ID and HIH
   - there is sufficient space between HIH and Cert to introduce new parameters

I checked the following files:

rfc4423.txt
rfc5201.txt
rfc5202.txt
rfc5203.txt
rfc5204.txt
rfc5205.txt
rfc5206.txt
rfc5338.txt
draft-ietf-hip-bone-03.txt
draft-ietf-hip-cert-02.txt
draft-ietf-hip-hiccups-00.txt
draft-ietf-hip-nat-traversal-09.txt
draft-ietf-hip-native-api-11.txt

Any more to check? HIP RG documents?


=================================================================

And Miika proposes:

I would say that it should be before the ESP_INFO parameter. 63?



http://www.iana.org/assignments/hip-parameters/hip-parameters.xhtml


====================================================================

So a hum is requested:

715?
63?

Other?