[tor-bugs] #21346 [Core Tor/Tor]: Clients with NoIPv4Traffic should only choose IPv6-supporting Exits

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#21346: Clients with NoIPv4Traffic should only choose IPv6-supporting Exits
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 Reporter:  teor                                 |          Owner:  neel
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  unspecified
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  ipv6, 031-deferred-20170425,         |  Actual Points:
  032-unreached                                  |
Parent ID:  #21311                               |         Points:  0.5
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------

Comment (by neel):

 Thank you again.

 Sorry to ask you one more time, but I have a few more questions:

  1. Is `connection_ap_attach_pending()` the stream attachment code?
  2. Would it be okay to use `node_has_ipv6_addr()` or
 `node_has_ipv6_orport()` along with checking for
 `!ap_conn->entry_cfg.ipv4_traffic` to see if a node has IPv6 support? If
 so, would `node_has_ipv6_addr()` suffice or would I need
 `node_has_ipv6_orport()`?

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21346#comment:9>
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