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RE: Reserved HTTP Frames

Mike Bishop <mbishop@evequefou.be> Fri, 10 August 2018 17:37 UTC

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From: Mike Bishop <mbishop@evequefou.be>
To: Ryan Hamilton <rch@google.com>
CC: IETF QUIC WG <quic@ietf.org>
Subject: RE: Reserved HTTP Frames
Thread-Topic: Reserved HTTP Frames
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Date: Fri, 10 Aug 2018 17:37:28 +0000
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Just for some context:  As you know, the point of greasing is to create a forcing function that makes it easier to do the right thing (skip unknown values) than the wrong thing (hard-code the list of grease values and ignore those).  Given that there are only eight of them, that’s already questionable.  To the limited extent possible, I want these to be easy to generate programmatically (pick a random number, do a simple calculation with it) and require at least a little work to hard-code.

I’d really prefer not to have the specific list in the doc at all, but certainly not in the main text.  However, I don’t think clarifying that you don’t run N to infinity and truncate is a problem.

From: Ryan Hamilton <rch@google.com>
Sent: Thursday, August 9, 2018 5:45 PM
To: Mike Bishop <mbishop@evequefou.be>
Cc: IETF QUIC WG <quic@ietf.org>
Subject: Re: Reserved HTTP Frames

Great, thanks! Would you be interested in a PR to add the "(0..7)" comment to 4.2.1?

On Thu, Aug 9, 2018 at 8:51 AM, Mike Bishop <mbishop@evequefou.be<mailto:mbishop@evequefou.be>> wrote:
No overflows.  The IANA section is more exhaustive:

Additionally, each code of the format 0xb + (0x1f * N) for values of N in the range (0..7) (that is, 0xb, 0x2a, 0x49, 0x68, 0x87, 0xa6, 0xc5, and 0xe4), the following values should be registered:

From: Ryan Hamilton <rch@google.com<mailto:rch@google.com>>
Sent: Wednesday, August 8, 2018 2:13 PM
To: IETF QUIC WG <quic@ietf.org<mailto:quic@ietf.org>>; Mike Bishop <mbishop@evequefou.be<mailto:mbishop@evequefou.be>>
Subject: Reserved HTTP Frames

I've a question about this text from the HTTP mapping doc:

4.2.1<https://tools.ietf.org/html/draft-ietf-quic-http-13#section-4.2.1>.  Reserved Frame Types





   Frame types of the format "0xb + (0x1f * N)" are reserved to exercise

   the requirement that unknown types be ignored.

For what values of "N" are we talking about? I assume [0,8)? Because, unless I'm doing the math wrong, if N can be [0,256) (and we're doing uint8_t math) then that covers all possible values.

Cheers,

Ryan

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