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

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Date:   Fri,  1 Jul 2022 09:58:03 +0200
From:   David Lamparter <equinox@...c24.net>
To:     netdev@...r.kernel.org
Cc:     "David S. Miller" <davem@...emloft.net>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Lamparter <equinox@...c24.net>
Subject: [PATCH resend net-next 0/2] ip6mr: implement RTM_GETROUTE for single entry

[resend with a slightly random pick of Cc:s - apologies if I ended up
choosing poorly]

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