[tor-bugs] #9068 [Tor]: Unify reachableaddresses and IPv6 settings

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#9068: Unify reachableaddresses and IPv6 settings
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 Reporter:  nickm            |          Owner:  teor
     Type:  enhancement      |         Status:  accepted
 Priority:  Medium           |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor              |        Version:
 Severity:  Normal           |     Resolution:
 Keywords:  tor-client ipv6  |  Actual Points:
Parent ID:  #17811           |         Points:
  Sponsor:                   |
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Comment (by teor):

 Also:
 * Prepend ReachableORAddresses and ReachableDirAddresses as well
 * Replace all instances of ClientUseIPv6 with the appropriate tests on
 ReachableAddresses.
   * Preserve the existing behaviour of ClientUseIPv6:
     * "Note that clients configured with an IPv6 address in a Bridge line
 will try connecting over IPv6 even if ClientUseIPv6 is set to 0."
   * This probably means implementing #9067
     * Which might be difficult to do without breaking existing configs,
 but I think we can fix that by:
       * Make ClientUseIPv6 1 append "accept [::]/0" to Reachable*Addresses
         * "For backwards-compatibility with IPv4-only Reachable*Addresses
 policies, when ClientUseIPv6 is set to 1, Reachable*Addresses will
 consider all IPv6 addresses reachable by default. End Reachable*Addresses
 with "reject *:*" to only allow explicitly specified IPv6 addresses."

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/9068#comment:5>
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