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Re: [manet] On Forwarding-and-regeneration (was: Re: draft-ietf-manet-aodvv2-13 review - a couple of big ticket Items)

Henning Rogge <hrogge@gmail.com> Fri, 22 April 2016 09:31 UTC

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From: Henning Rogge <hrogge@gmail.com>
Date: Fri, 22 Apr 2016 11:31:17 +0200
Message-ID: <CAGnRvurB8f72Op3F9LqP1D_F9ALTmyvtxEEVx+fbEKq4rcY6pg@mail.gmail.com>
To: Lotte Steenbrink <lotte.steenbrink@fu-berlin.de>
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Cc: Mobile Ad Hoc Networks mailing list <manet@ietf.org>
Subject: Re: [manet] On Forwarding-and-regeneration (was: Re: draft-ietf-manet-aodvv2-13 review - a couple of big ticket Items)
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On Fri, Apr 22, 2016 at 11:28 AM, Lotte Steenbrink
<lotte.steenbrink@fu-berlin.de> wrote:
> Hi Henning,
>
> D’oh, right. Yeah, if I remember it correctly, that’s what you explained to me when I got confused about the topic last spring… But– even if a message contains TLVs that the AODVv2 implementation handling it doesn’t understand, it will still be able to recognize the Metric TLV, right? Isn’t that the nifty thing about RFC5444? So, while we really shouldn’t write “before calculating the ICV, set the n-th 4 octets to 0”, we might say “identify the octets that make up the metric value and set those to 0”?

Of course... you can build a "binary modifier" for RFC5444...

in fact I have done something like this on the way to implement
signatures (RFC7182) because you need the message layout before you
can calculate the hash.

And I can tell you it can be a pain in the *** for a generic
parser/generator system. It is worse for signatures (you need to
add/remove TLVs), but it is still not trivial for your usecase.

Henning Rogge

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