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Re: [quicwg/base-drafts] Change packet types (#1655)

Martin Thomson <notifications@github.com> Fri, 14 September 2018 07:24 UTC

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Date: Fri, 14 Sep 2018 07:24:03 +0000
From: Martin Thomson <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Change packet types (#1655)
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This one turns out to be tricky.  The question of where 0-RTT packets sit is a problem of competing concerns.  If we want to be nice to SRTP, it would be good to put Retry and 0-RTT on 0b10xx.xxxx (because those are unlikely to be of use in typical usage of SRTP).  On the other hand, here we have a request to put Initial and 0-RTT on 0b11xx.xxxx.  Noting that we are likely to use the remaining bits of the octet for many other things, maybe we can refine the proposal.

If we were to put Initial and 0-RTT adjacent in a different way, I think we can address all the concerns.

How bad is this test: `(pkt_type & 0xc0 != 0x80)` ?  I don't think that turns into any more instructions than `pkt_type < 0xfe`.

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