[tor-bugs] #33244 [Core Tor/Tor]: Prop 312: 3.2.5. Use IPv6 Addresses from Directory Servers

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#33244: Prop 312: 3.2.5. Use IPv6 Addresses from Directory Servers
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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:  prop312, ipv6
Actual Points:                  |  Parent ID:  #33241
       Points:  2               |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 If relays are unable to discover their IPv6 address in any other way, they
 should get their IPv6 address from the X-Your-Address-Is HTTP header in
 tor directory documents. To support this change, we propose that relays
 start fetching directory documents over IPv4 and IPv6.

 We propose that bridges continue to only fetch directory documents over
 IPv4, because they try to imitate clients. Therefore, they can't use X
 -Your-Address-Is HTTP headers to find their IPv6 addresses.

 Tor already ignores private IPv4 addresses in directory headers. We
 propose
 to also ignore private IPv6 addresses in directory headers. If all IPv4
 and
 IPv6 addresses in directory headers are private, address resolution should
 return a temporary error.

 Whenever address resolution fails, tor should warn the operator to set the
 Address torrc option for IPv4 and IPv6. (If IPv4 is available, and only
 IPv6 is missing, the log should be at notice level.) These logs may need
 to
 be rate-limited.

 Whenever tor receives a directory header containing a new public IPv4 or
 IPv6 address, tor should try to use that address for reachability checks.
 If the
 reachability checks succeed, tor should use that address in its
 descriptor.

 See proposal 312, section 3.2.5, IPv6 address usage part:
 ​https://gitweb.torproject.org/torspec.git/tree/proposals/312-relay-auto-
 ipv6-addr.txt#n457

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33244>
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