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Re: [Cbor] GRASP packet header extensions (CBOR question)

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 19 August 2022 22:01 UTC

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Date: Sat, 20 Aug 2022 10:01:37 +1200
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To: Carsten Bormann <cabo@tzi.org>
Cc: Toerless Eckert <tte@cs.fau.de>, anima@ietf.org, cbor@ietf.org
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [Cbor] GRASP packet header extensions (CBOR question)
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On 20-Aug-22 09:15, Carsten Bormann wrote:
> On 2022-08-19, at 23:05, Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>>
>>>> EXTENSION_TYPE = 0..255
>>> There is no reason to limit this to 255.
>>> ➔ EXTENSION_TYPE = uint
>>> (Do you plan to creat a registry for these?
>>
>> The 'extension_type' terminology is confusing, because these would
>> be new GRASP options, and they already have a registry.
>>
>>>> grasp-extension = [ EXTENSION_TYPE, *any ]
> 
> Ah, OK, Section 2.9.1 of RFC 8990 (why didn’t we provide CDDL for the general concept of a GRASP option?).
> So this really should have been called grasp-option, and the grasp-option in message-structure should have been called something else?  (It seems to include both 2.9.1 grasp options and 2.10.1 objective options, as well as ttl and waiting-time in the message types defined in RFC 8990).
> 
> Apologies for taking a while to swap in the GRASP details again...

Ditto, but referring to CDDL details. Off list, I suggested:

    grasp-option = numeric-option / objective
    numeric-option = option .within option-structure
    option-structure = [0..255, any]

and then

    option /= divert-option

etc.

and then we can use *numeric-option or ?*numeric-option as needed.

     Brian

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