[Bug 224247] [patch] RFC 6980 requires to drop fragmented IPv6 neighbour discovery

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224247

--- Comment #6 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Fri Dec 15 12:37:32 UTC 2017
New revision: 326876
URL: https://svnweb.freebsd.org/changeset/base/326876

Log:
  Follow the RFC6980 and silently ignore following IPv6 NDP messages
  that had the IPv6 fragmentation header:
   o  Neighbor Solicitation
   o  Neighbor Advertisement
   o  Router Solicitation
   o  Router Advertisement
   o  Redirect

  Introduce M_FRAGMENTED mbuf flag, and set it after IPv6 fragment reassembly
  is completed. Then check the presence of this flag in correspondig ND6
  handling routines.

  PR:           224247
  MFC after:    2 weeks

Changes:
  head/sys/netinet6/frag6.c
  head/sys/netinet6/icmp6.c
  head/sys/netinet6/in6.h
  head/sys/netinet6/nd6_nbr.c
  head/sys/netinet6/nd6_rtr.c

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