[tor-bugs] #33224 [Core Tor/Tor]: Prop 311: 4.3.2. Add AssumeIPv6Reachable Option

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#33224: Prop 311: 4.3.2. Add AssumeIPv6Reachable Option
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     Reporter:  teor            |      Owner:  teor
         Type:  enhancement     |     Status:  assigned
     Priority:  Medium          |  Milestone:  Tor: 0.4.4.x-final
    Component:  Core Tor/Tor    |    Version:
     Severity:  Normal          |   Keywords:  ipv6, prop311
Actual Points:                  |  Parent ID:  #33221
       Points:  1               |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 We add an AssumeIPv6Reachable torrc option and consensus parameter.

 If IPv6 ORPort checks have bugs that impact the health of the network,
 they can be disabled by setting AssumeIPv6Reachable=1 in the consensus
 parameters.

 If IPv6 ORPort checks have bugs that impact a particular relay (or
 bridge),
 they can be disabled by setting "AssumeIPv6Reachable 1" in the relay's
 torrc.

 This option disables IPv6 ORPort reachability checks, so relays publish
 their descriptors if their IPv4 ORPort reachability checks succeed.
 (Unlike AssumeReachable, AssumeIPv6Reachable has no effect on the existing
 dirauth IPv6 reachability checks, which connect directly to relay
 ORPorts.)

 The default for the torrc option is "auto", which checks the consensus
 parameter. If the consensus parameter is not set, the default is "0".

 "AssumeReachable 1" overrides all values of "AssumeIPv6Reachable",
 disabling both IPv4 and IPv6 ORPort reachability checks. Tor should warn
 if
 AssumeReachable is 1, but AssumeIPv6Reachable is 0. (On directory
 authorities, "AssumeReachable 1" also disables dirauth IPv4 and IPv6
 reachability checks, which connect directly to relay ORPorts.
 AssumeIPv6Reachable does not disable directory authority to relay IPv6
 checks.)

 See proposal 311, section 4.3.2:
 https://gitweb.torproject.org/torspec.git/tree/proposals/311-relay-
 ipv6-reachability.txt#n403

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33224>
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