[Bug 290221] [netlink] default build of /usr/sbin/arp is broken for proxyarp

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=290221

--- Comment #2 from commit-hook@FreeBSD.org ---
A commit in branch main references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=c26d6bf9da013e839d9a696746ea1741569e619e

commit c26d6bf9da013e839d9a696746ea1741569e619e
Author:     Andrey V. Elsukov <ae@FreeBSD.org>
AuthorDate: 2025-10-17 07:53:35 +0000
Commit:     Andrey V. Elsukov <ae@FreeBSD.org>
CommitDate: 2025-10-17 08:22:36 +0000

    arp: fix adding proxy entries for P2P interfaces

    The old rtsock implementation used in-kernel workaround to do so.
    When route to specified destination address used P2P interface, the
    kernel did the search with ifa_ifwithnet() for most suitable network
    and then add proxy entry to this interface.

    Use similar approach with netlink implementation. We already have
    get_ether_addr() function that does almost the same thing as
    ifa_ifwithnet(). Use it when we find that destination route uses
    P2P interface and then try to guess suitable interface. This should
    fix the use of netlink-based arp(8) in mpd5.

    Rename get_ether_addr() to get_ifinfo(), since now it is used to find
    only ifindex in case when hwaddr is specified by user.
    Also make set_nl() and delete_nl() prototype similar to rtsock.
    And allow '-i' to be used with '-S', since we already allow the same
    for '-s'.

    PR:             290221
    Reported by:    eugen
    Reviewed by:    eugen
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D53113

 usr.sbin/arp/arp.c         | 32 ++++++++++++++++++++------------
 usr.sbin/arp/arp.h         |  9 ++++-----
 usr.sbin/arp/arp_netlink.c | 20 ++++++++++++++++----
 3 files changed, 40 insertions(+), 21 deletions(-)

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