[Bug 248172] OpenVPN configuring tun/tap devices ends up with IFDISABLED interfaces (problem with all ifnet, especially cloned ones)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248172

--- Comment #26 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: bz
Date: Wed Nov 25 20:58:01 UTC 2020
New revision: 368031
URL: https://svnweb.freebsd.org/changeset/base/368031

Log:
  IPv6: set ifdisabled in the kernel rather than in rc

  Enable ND6_IFF_IFDISABLED when the interface is created in the
  kernel before return to user space.

  This avoids a race when an interface is create by a program which
  also calls ifconfig IF inet6 -ifdisabled and races with the
  devd -> /etc/pccard_ether -> .. netif start IF -> ifdisabled
  calls (the devd/rc framework disabling IPv6 again after the program
  had enabled it already).

  In case the global net.inet6.ip6.accept_rtadv was turned on,
  we also default to enabling IPv6 on the interfaces, rather than
  disabling them.

  PR:           248172
  Reported by:  Gert Doering (gert greenie.muc.de)
  Reviewed by:  glebius (, phk)
  MFC after:    2 weeks
  Differential Revision:        https://reviews.freebsd.org/D27324

Changes:
  head/libexec/rc/network.subr
  head/sys/netinet6/nd6.c

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