Re: [quicwg/base-drafts] Rework Key Update (#2237)

[Martin Thomson <[e-mail]>]

martinthomson commented on this pull request.



> @@ -5012,6 +5020,44 @@ Reason Phrase:
   This SHOULD be a UTF-8 encoded string {{!RFC3629}}.
 
 
+## KEYS_READY Frame {#frame-keys-ready}
+
+An endpoint sends a KEYS_READY frame (type=0x1e) to signal that it has installed
+keys for reading and writing packets.  Receipt of this frame in a packet
+indicates that all earlier keys can be safely discarded.

We've had some discussions about losing packets during the handshake due to reordering, and I think that we just have to make some allowances in the congestion controller/loss recovery for that possibility.  For packets that we abandon like this, we lose the positive signal (i.e., congestion window increase), but we don't necessarily create a negative signal, because abandonment means that you don't declare them lost.

I'll tweak the text about the dropping of keys requiring both sending and receiving of the frame.

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