[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 #7 from commit-hook at freebsd.org ---
A commit references this bug:

Author: ae
Date: Fri Dec 29 10:47:25 UTC 2017
New revision: 327337
URL: https://svnweb.freebsd.org/changeset/base/327337

Log:
  MFC r326876:
    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

Changes:
_U  stable/11/
  stable/11/sys/netinet6/frag6.c
  stable/11/sys/netinet6/icmp6.c
  stable/11/sys/netinet6/in6.h
  stable/11/sys/netinet6/nd6_nbr.c
  stable/11/sys/netinet6/nd6_rtr.c

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