[tor-dev] Connection, Channel and Scheduler - An Intense Trek
dgoulet at ev0ke.net
Wed Nov 1 13:09:36 UTC 2017
On 01 Nov (07:31:50), Ian Goldberg wrote:
> On Wed, Nov 01, 2017 at 02:28:03PM +1100, teor wrote:
> > > On 31 Oct 2017, at 06:57, David Goulet <dgoulet at ev0ke.net> wrote:
> > >
> > > * I believe now that we should seriously discuss the relevance of channels.
> > > Originally, the idea was good that is providing an abstraction layer for the
> > > relay to relay handshake and send/process cells related to the protocol. But,
> > > as of now, they are half doing it.
> > >
> > > There is an important cost in code and maintanance of something that is not
> > > properly implemented/finished (channel abstraction) and also something that
> > > is unused. An abstraction implemented only for one thing is not really useful
> > > except maybe to offer an example for others? But we aren't providing a good
> > > example right now imo...
> > >
> > > That being said, we can spend time fixing the channel subsystem, trying to
> > > turn it in a nicer interface, fixing all the issues I've described above (and
> > > I suspect there might be more) so the cell scheduler can play nicely with
> > > channels. Or, we could rip them off eliminating lots of code and reducing our
> > > technical debt. I would like us to think about what we want seriously because
> > > that channel subsystem is _complicated_ and very few of us fully understands
> > > it afaict.
> > It depends what the goal of the channel layer is.
> > Do we seriously think we will use another protocol in place of TLS?
> The channel layer has certainly been used fruitfully in the past for
> experiments with other transports, such as UDP-based ones, QUIC-Tor,
> etc. I would be a little sad to see it disappear completely.
So after Montreal meeting, I got access to QUIC-Tor code. And, as a
misconception of channels, they aren't about "transport" but "protocol".
Thus the QUIC-Tor code didn't even *touch* channels ;). Everything they did
had to be done mostly at the connection layer.
For some reasearch to experiement with channels, it would be basically a
research based on _removing_ TLS between relays. I'm not aware of such a thing
right now but I'm sure someone did poked at it for sure!
> Ian Goldberg
> Professor and University Research Chair
> Cheriton School of Computer Science
> University of Waterloo
> tor-dev mailing list
> tor-dev at lists.torproject.org
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