K 10
svn:author
V 2
kp
K 8
svn:date
V 27
2022-10-13T08:09:41.726572Z
K 7
svn:log
V 887
dhclient-script: cope with /32 address leases

On certain cloud platforms (Google Cloud, Packet.net and others) the
DHCP server offers a /32 address. This makes adding the default route
fail since it is not reachable via any interface. Linux's
dhclient-script seem to usually have a special case for that and
explicitly adds an interface route to the router's address.

FreeBSD's dhclient-script already has a special case for when the router
address is the same as the leased address. Now also add one for when
it's a different address that doesn't fall in the interface's subnet.

PR:		241792
Event:		Aberdeen hackathon 2022
Submitted by:	sigsys@gmail.com
Reviewed by:	dch, kp, bz (+1 on the idea, not reviewed), thj
MFC after:	1 week

(cherry picked from commit fd6ecc184dbc64b9b3f7866b34812fb93df62925)

Git Hash:   7ca75b93b9facd6dd0a733f25f577a1c9862a46b
Git Author: kp@FreeBSD.org
END