[tor-bugs] #31088 [Core Tor/Tor]: Check IPv4 and IPv6 private addresses in descriptors, first hops, and extends

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#31088: Check IPv4 and IPv6 private addresses in descriptors, first hops, and
extends
-------------------------+-------------------------------------------------
     Reporter:  teor     |      Owner:  (none)
         Type:  defect   |     Status:  new
     Priority:  Medium   |  Milestone:  Tor: unspecified
    Component:  Core     |    Version:
  Tor/Tor                |   Keywords:  ipv6, tor-relay, tor-client, tor-
     Severity:  Normal   |  dirauth
Actual Points:           |  Parent ID:  #24403
       Points:           |   Reviewer:
      Sponsor:           |
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 Tor should check for private relay IPv6 addresses:

 When authorities check descriptors:
 https://github.com/torproject/tor/blob/e9d99d2e15f09a394ad01189b7965af4888a61a6/src/feature/dirauth/process_descs.c#L429

 When relays extend:
 https://github.com/torproject/tor/blob/f7e8b3b68c8e2cecfc7ff4072e9f00d316aaba4f/src/core/or/circuitbuild.c#L1253

 And when clients connect:
 https://github.com/torproject/tor/blob/f7e8b3b68c8e2cecfc7ff4072e9f00d316aaba4f/src/core/or/circuitbuild.c#L552

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31088>
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