Mark Johnston 4de485fe5f Lock the NDP default router list and count defrouter references.
This addresses a number of race conditions that can cause crashes as a
result of unsynchronized access to the list.

PR:		206904
Tested by:	Larry Rosenman <ler@lerctr.org>,
		Kevin Bowling <kevin.bowling@kev009.com>
MFC after:	2 months
Differential Revision: https://reviews.freebsd.org/D5315
2016-02-25 20:12:05 +00:00
..
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