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Re: Payload length 0

Jana Iyengar <jri.ietf@gmail.com> Fri, 25 May 2018 22:51 UTC

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From: Jana Iyengar <jri.ietf@gmail.com>
Date: Fri, 25 May 2018 15:50:56 -0700
Message-ID: <CACpbDcezAWLC+4W8CezXnjyivWGV6ktR_XoCDnBT24MUKCg-PA@mail.gmail.com>
Subject: Re: Payload length 0
To: Martin Thomson <martin.thomson@gmail.com>
Cc: Marten Seemann <martenseemann@gmail.com>, QUIC WG <quic@ietf.org>, "Eggert, Lars" <lars@netapp.com>
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I'm fine with having 0 not be special. Marten and Lars had stronger
opinions, so they should speak up.

On Thu, May 24, 2018 at 9:06 PM, Martin Thomson <martin.thomson@gmail.com>
wrote:

> It seems like the discussion has settled down.
>
> For those advocating for 0 being special, are you happy to keep things as
> they are?
> On Fri, May 18, 2018 at 3:08 PM Marten Seemann <martenseemann@gmail.com>
> wrote:
>
> > Jana asked me to raise this issue on the list, after we already had a bit
> of discussion in https://github.com/quicwg/base-drafts/pull/1301.
>
> > The proposal is to make a payload length of 0 a special value, indicating
> that the packet is not a coalesced packet, i.e. that the whole payload of
> the UDP packet is the QUIC packet. This would eliminate an invalid value of
> the payload length (there are no empty packets), save one byte for packet
> lengths where varint encoding would result in a two byte number, and
> apparently also simplify (some) implementations.
>
> > Kazuho argued creating two versions of each Long Header type (one with
> and one without a payload length) is the better solution, since all values
> below the AEAD tag length + 1 are invalid values anyway, and it would save
> one more byte.
>
> > We should make a decision if and what we want to do about this.
>
>

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