Re: [netmod] "uint24" in rfc6991-bis?

"Rob Wilton (rwilton)" <rwilton@cisco.com> Thu, 23 April 2020 09:25 UTC

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From: "Rob Wilton (rwilton)" <rwilton@cisco.com>
To: Juergen Schoenwaelder <j.schoenwaelder@jacobs-university.de>, Robert Varga <nite@hq.sk>
CC: "netmod@ietf.org" <netmod@ietf.org>
Thread-Topic: [netmod] "uint24" in rfc6991-bis?
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Date: Thu, 23 Apr 2020 09:25:31 +0000
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Subject: Re: [netmod] "uint24" in rfc6991-bis?
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[As an individual contributor]

> -----Original Message-----
> From: netmod <netmod-bounces@ietf.org> On Behalf Of Juergen Schoenwaelder
> Sent: 22 April 2020 23:09
> To: Robert Varga <nite@hq.sk>
> Cc: netmod@ietf.org
> Subject: Re: [netmod] "uint24" in rfc6991-bis?
> 
> On Wed, Apr 22, 2020 at 11:17:26PM +0200, Robert Varga wrote:
> > Hello,
> >
> > a number of IETF protocols-and-whatnots are operating on unsigned
> > 24bit (or 3-octet) entities. For example:
> >
> > https://tools.ietf.org/html/rfc7471#section-4.1.5
> > https://tools.ietf.org/html/rfc7471#section-4.4.5
> > SRGB range start/length in https://tools.ietf.org/html/rfc8669
> 
> For these use cases, it might be also a good idea to define types that
> capture the additional semantics. SRGB seems to consist of two 24-bit
> values - I can't tell whether it makes sense to model this 6-octet value
> as two 3-octet values in YANG.
> 
> > I wonder whether it would make sense to provide something like:
> >
> > type uint24 {
> >    type uint32;
> >    range 0..16777215;
> > }
> >
> > in ietf-inet-types as a common base type for such definitions.
> 
> If we add such a definition, it likely should go into ietf-yang-types.
[RW] 

I would find this type somewhat confusing in the sense that it mixing the underlying YANG datatype with the range of the value space,

e.g., I don't think of uint8 as
type uint8 {
   type uint32;
   range 0..255;
}

because the encoding is allowed to be different.  Perhaps having a slightly different name would help avoid possible confusion with the built in types?

Regards,
Rob


> 
> /js
> 
> --
> Juergen Schoenwaelder           Jacobs University Bremen gGmbH
> Phone: +49 421 200 3587         Campus Ring 1 | 28759 Bremen | Germany
> Fax:   +49 421 200 3103         <https://www.jacobs-university.de/>
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