Re: [quicwg/base-drafts] It is unclear if some frames are forbidden in 0-RTT (#3430)

Mike Bishop <notifications@github.com> Thu, 06 February 2020 10:45 UTC

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Date: Thu, 06 Feb 2020 02:45:11 -0800
From: Mike Bishop <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] It is unclear if some frames are forbidden in 0-RTT (#3430)
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It's not forbidden, it's impossible -- or more precisely, it's a protocol violation to send them for other reasons.  HANDSHAKE_DONE and NEW_TOKEN frames are sent only by servers, and servers don't send 0-RTT.  A client sending them at any time is forbidden.

PATH_RESPONSE is sent only in response to a PATH_CHALLENGE; PATH_CHALLENGE can only be sent in 0-RTT or 1-RTT, and servers don't send 0-RTT.  Therefore, the client can't be responding to a PATH_CHALLENGE while it's still sending 0-RTT.

RETIRE_CONNECTION_ID can't retire the CID of its own packet.  Until the transport parameters have been parsed, the client only has one CID for the server, so it's illegal to retire it.  Once the transport parameters have been parsed, in the "simple" handshake flow, the client shouldn't be sending 0-RTT.  If the handshake requires an extra round-trip, is it possible to keep sending 0-RTT after having processed the Server Hello?

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