netdev - [PATCH net-next 0/2] ip6mr: implement RTM

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Message-Id: <20220630133051.41685-1-equinox@diac24.net>
Date:   Thu, 30 Jun 2022 15:30:49 +0200
From:   David Lamparter <equinox@...c24.net>
To:     netdev@...r.kernel.org
Cc:     David Lamparter <equinox@...c24.net>
Subject: [PATCH net-next 0/2] ip6mr: implement RTM_GETROUTE for single entry

The IPv6 multicast routing code implements RTM_GETROUTE, but only for a
dump request.  Retrieving a single MFC entry is not currently possible
via netlink.

While most of the data here can also be retrieved with SIOCGETSGCNT_IN6,
the lastused / RTA_EXPIRES is not included in the ioctl result (and we
need it in FRR.)

=> Implement single-entry RTM_GETROUTE by copying and adapting the IPv4
code.

Tested against FRRouting's (work-in-progress) IPv6 PIM implementation.

Cheers,

-David