[Bug 242677] multicast: setsockopt(...IP_DROP_MEMBERSHIP...) doesn't lead to sending IGMP packet after base r349369

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=242677

--- Comment #10 from commit-hook at freebsd.org ---
A commit references this bug:

Author: hselasky
Date: Wed Dec 25 09:25:21 UTC 2019
New revision: 356069
URL: https://svnweb.freebsd.org/changeset/base/356069

Log:
  MFC r355881:
  Leave multicast group before reaping and committing state for both
  IPv4 and IPv6.

  This fixes a regression issue after r349369. When trying to exit a
  multicast group before closing the socket, a multicast leave packet
  should be sent.

  Differential Revision:        https://reviews.freebsd.org/D22848
  PR: 242677
  Reviewed by:  bz (network)
  Tested by:    Aleksandr Fedorov <aleksandr.fedorov at itglobal.com>
  Sponsored by: Mellanox Technologies

Changes:
_U  stable/12/
  stable/12/sys/netinet/in_mcast.c
  stable/12/sys/netinet6/in6_mcast.c

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