[Bug 241792] dhclient/dhclient-script: dhclient default route not working when given a /32 netmask

From: <bugzilla-noreply_at_freebsd.org>
Date: Thu, 13 Oct 2022 08:09:40 UTC
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241792

--- Comment #6 from commit-hook@FreeBSD.org ---
A commit in branch stable/12 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=7ca75b93b9facd6dd0a733f25f577a1c9862a46b

commit 7ca75b93b9facd6dd0a733f25f577a1c9862a46b
Author:     Kristof Provost <kp@FreeBSD.org>
AuthorDate: 2022-10-05 10:11:07 +0000
Commit:     Kristof Provost <kp@FreeBSD.org>
CommitDate: 2022-10-13 07:56:50 +0000

    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)

 sbin/dhclient/dhclient-script | 4 ++++
 1 file changed, 4 insertions(+)

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