[tor-bugs] #33264 [Core Tor/Tor]: Prop 313: 5. Collect IPv6 Connection Statistics on Relays

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#33264: Prop 313: 5. Collect IPv6 Connection Statistics on Relays
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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:  prop313, ipv6
Actual Points:                  |  Parent ID:  #33052
       Points:  2               |   Reviewer:
      Sponsor:  Sponsor55-must  |
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 We propose that relays (but not bridges) collect IPv6 connection
 statistics.

 Bridges refuse to collect the existing ConnDirectionStatistics, so we do
 not
 believe it is safe to collect the smaller IPv6 totals on bridges.

 To minimise development and testing effort, we propose re-using the
 existing
 "bidi" code in rephist.c. (This code may require some refactoring, because
 the "bidi" totals are globals, rather than a struct.)


 (We might also want to move this code into separate relay-only code and
 header files, because it is relay-specific.)

 In particular, tor currently counts these connection statistics:
   * below threshold,
   * mostly read,
   * mostly written, and
   * both read and written.

 We propose adding IPv6 variants of all these statistics. (The IPv4
 statistics can be calculated by subtracting the IPv6 statistics from the
 existing total connection statistics.)

 See proposal 313, section 5:
 https://gitweb.torproject.org/torspec.git/tree/proposals/313-relay-
 ipv6-stats.txt#n144

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/33264>
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