Re: [quicwg/base-drafts] Clarify zero-length CIDs and active_connection_id_limit TP (#3426)

Nick Harper <notifications@github.com> Thu, 12 March 2020 17:57 UTC

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Date: Thu, 12 Mar 2020 10:57:44 -0700
From: Nick Harper <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Clarify zero-length CIDs and active_connection_id_limit TP (#3426)
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nharper commented on this pull request.



> @@ -4697,11 +4697,12 @@ active_connection_id_limit (0x000e):
   to store. This value includes the connection ID received during the handshake,
   that received in the preferred_address transport parameter, and those received
   in NEW_CONNECTION_ID frames.
-  Unless a zero-length connection ID is being used, the value of the
-  active_connection_id_limit parameter MUST be no less than 2. If this
-  transport parameter is absent, a default of 2 is assumed.
-  When a zero-length connection ID is being used, the active_connection_id_limit
-  parameter MUST NOT be sent.
+  The value of the active_connection_id_limit parameter MUST be at least 2.
+  If this transport parameter is absent, a default of 2 is assumed.  If an
+  endpoint uses a zero-length connection ID, the active_connection_id_limit
+  value received from its peer is ignored and not used, as
+  NEW_CONNECTION_ID frames cannot be sent by an endpoint that opts for a
+  zero-length connection ID.
 

The text "When a zero-length connection ID is being used, the active_connection_id_limit parameter MUST NOT be sent." is removed in this PR.

If 0-length CIDs are used, then this TP is irrelevant. The endpoints still need to remember what value was sent for this TP (or remember the default of 2). Remembering this could be a hardcoded configuration, e.g. if the client always sends 0-length CIDs then it doesn't actually need to remember it.

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