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.

I don't want to delay discarding Initial keys, because we're would lose the DoS fix. Handshake keys are probably ok, but it is easier to draw the line between handshake and key update.

I don't expect that loss and reordering will be that significant, nor will the loss of positive signals. Any missing packets should be small (just an ACK probably), so the reduced increase to congestion allowance would be negligible.

We could add text to Section 6.2.2 of the recovery draft to this effect.

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