rstone 9c794ac899 Increment the route table gen count after a modify
Increment the route table generation count after modifying a
route.  This signals back to TCP connections that they need to
update their L2 caches as the gateway for their route may have
changed.  This is a heavier hammer than is needed, strictly
speaking, but route changes will be unlikely enough that the
performance effects of invalidating all connection route caches
should be negligible.

MFC after:	1 week
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D13990
Reviewed by:	karels
2018-01-23 03:15:44 +00:00
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