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Re: Payload length 0

Marten Seemann <martenseemann@gmail.com> Sat, 26 May 2018 00:20 UTC

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From: Marten Seemann <martenseemann@gmail.com>
Date: Sat, 26 May 2018 08:20:21 +0800
Message-ID: <CAOYVs2pcSC__ERAWzd8dwJ_4HXL_je1heftyQz6YCCSM6gQ_yQ@mail.gmail.com>
Subject: Re: Payload length 0
To: Jana Iyengar <jri.ietf@gmail.com>
Cc: "Eggert, Lars" <lars@netapp.com>, Martin Thomson <martin.thomson@gmail.com>, QUIC WG <quic@ietf.org>
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Works for me.

On Sat 26. May 2018 at 06:50, Jana Iyengar <jri.ietf@gmail.com> wrote:

> 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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