[tor-bugs] #33222 [Core Tor/Tor]: Prop 311: 4.2. Implement IPv6 ORPort Reachability Self-Tests

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#33222: Prop 311: 4.2. Implement IPv6 ORPort Reachability Self-Tests
---------------------------+------------------------------------
 Reporter:  teor           |          Owner:  teor
     Type:  enhancement    |         Status:  assigned
 Priority:  Medium         |      Milestone:  Tor: 0.4.4.x-final
Component:  Core Tor/Tor   |        Version:
 Severity:  Normal         |     Resolution:
 Keywords:  ipv6, prop311  |  Actual Points:  1.1
Parent ID:  #33221         |         Points:  6
 Reviewer:  nickm          |        Sponsor:  Sponsor55-must
---------------------------+------------------------------------
Changes (by teor):

 * reviewer:   => nickm
 * actualpoints:   => 1.1


Comment:

 Here's an initial PR, to show that the IPv6 extend and reachability code
 can work:
 * don't merge: https://github.com/torproject/tor/pull/1874

 It sends IPv4-only and IPv6-only extends on reachability circuits, to any
 third hop.

 Here's what we need to do before we merge:
 * 4.2.1 Selecting the Final Extending Relay (this ticket)
   * 5. Declare Support for Subprotocol Version "Relay=3" (#33226)
 * unit tests
 * changes files

 Then we can iterate on the remaining work.

 I'd like an initial review on this code. But it's not blocking anything
 for me. I have a big list of tasks I still need to do :-)

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33222#comment:7>
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