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Re: [quicwg/base-drafts] Rework Retry packet (#1498)

Marten Seemann <notifications@github.com> Wed, 18 July 2018 14:39 UTC

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Date: Wed, 18 Jul 2018 14:39:40 +0000
From: Marten Seemann <notifications@github.com>
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Subject: Re: [quicwg/base-drafts] Rework Retry packet (#1498)
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marten-seemann commented on this pull request.



> + 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|    0x7e     |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                         Version (32)                          |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|DCIL(4)|SCIL(4)|
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|               Destination Connection ID (0/32..144)         ...
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                 Source Connection ID (0/32..144)            ...
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|    ODCIL(8)   |      Original Destination Connection ID (*)   |
++-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+|                        Retry Token (*)                      ...

This might be a bit esoteric, but here's possible use cases:
Let's say a server only support QUIC v1, and it receives an Initial packet for a different version. The server would then send a Version Negotiation Packet, and could coalesce that with a Retry packet, in order to save one round trip.
I admit feels kind of clumsy though, since the Retry would have to go *in front of* the VNP (since the VNP doesn't have a length field).

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