George V. Neville-Neil 84cc0778d0 FreeBSD previously provided route caching for TCP (and UDP). Re-add
route caching for TCP, with some improvements. In particular, invalidate
the route cache if a new route is added, which might be a better match.
The cache is automatically invalidated if the old route is deleted.

Submitted by:	Mike Karels
Reviewed by:	gnn
Differential Revision:	https://reviews.freebsd.org/D4306
2016-03-24 07:54:56 +00:00
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