Re: Unrecoverable loss pattern

Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com> Mon, 05 March 2018 20:30 UTC

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From: Mikkel Fahnøe Jørgensen <mikkelfj@gmail.com>
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Subject: Re: Unrecoverable loss pattern
To: Ian Swett <ianswett@google.com>, Christian Huitema <huitema@huitema.net>
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Yes, I was having the same thought recently - that stream 0’s non-flow
control ought to end along with the stream itself. That naturally begs for
a different post handshake crypto stream, but in this case linearity is
guaranteed because you simply wait for stream 0 to end.

End of stream 0 thus signals handshake termination, and it avoids
accidentally processing a frame with the wrong crypto level.

In the more general case it is not so clearcut because you don’t want to
change streams when you change paths, even if there are some flow control
aspects that are appealing. But this can wait until multi-path becomes more
clear and also ties in with packet number visibility, to a degree.

On 5 March 2018 at 21.08.55, Ian Swett (ianswett@google.com) wrote:

I was thinking that you'd designate a different stream as the
post-handshake encrypted crypto stream and stream 0 would become the
unencrypted crypto stream.  Possibly that stream would be subject to flow
control, and we could not subject stream 0 to flow control, which may be
simpler than the current flow control arrangement?  Or possibly that causes
more problems than it solves, since TLS is designed as a single stream.