K 10
svn:author
V 3
eri
K 8
svn:date
V 27
2015-07-02T18:10:41.587227Z
K 7
svn:log
V 573
Avoid doing multiple route lookups for the same destination IP during forwarding

ip_forward() does a route lookup for testing this packet can be sent to a known destination,
it also can do another route lookup if it detects that an ICMP redirect is needed,
it forgets all of this and handovers to ip_output() to do the same lookup yet again.

This optimisation just does one route lookup during the forwarding path and handovers that to be considered by ip_output().

Differential Revision:	https://reviews.freebsd.org/D2964
Approved by:	ae, gnn(mentor)
MFC after:	1 week

END