Re: [quicwg/base-drafts] Multiple connections on the same port (#714)

Nick Banks <notifications@github.com> Tue, 14 November 2017 15:27 UTC

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Date: Tue, 14 Nov 2017 15:27:00 +0000
From: Nick Banks <notifications@github.com>
Reply-To: quicwg/base-drafts <reply+0166e4abe2f43711bceeb46f92ac8e9cf80cbd62ad36194c92cf000000011622cd4492a169ce0ed5746a@reply.github.com>
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Subject: Re: [quicwg/base-drafts] Multiple connections on the same port (#714)
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Another possible solution:

Take 1 bit from each header's Type field and designate it the Client Connection ID flag (shown as `I` here). When set, it indicates the presence of the Client Connection ID field in the header.
```
 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+
|1|I|  Type (6) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                       Connection ID (64)                      +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       Packet Number (32)                      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Version (32)                          |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                 [Client Connection ID (64)]                   +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                          Payload (*)                        ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
```
```
 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+
|0|C|I|K|Type(4)|
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                     [Connection ID (64)]                      +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+                 [Client Connection ID (64)]                   +
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                      Packet Number (8/16/32)                ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                     Protected Payload (*)                   ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
```
Then, a server that changes the Connection ID is required include the Client Connection ID in all packets (long and short) it sends until it receives a packet from the client that uses the new Connection ID.

Also, I am not positive, but I believe these new flags and fields would have constant across versions.

If a client doesn't intent to share the port locally, then they should include the `omit_connection_id` transport parameter When set the server isn't required to send the Client Connection ID.

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