Merge branch 'rtnetlink-dump-link-layer-multicast-addresses'

Yuyang Huang says:

====================
rtnetlink: dump link-layer multicast addresses

"ip maddr show" prints link-layer, IPv4 and IPv6 entries. The IPv4 and
IPv6 ones come over netlink today, with IFA_MC_USERS for the user count.
The link-layer list, dev->mc, is only exported via /proc/net/dev_mcast,
so iproute2 and other users still parse procfs for it.

This series adds the AF_PACKET family to RTM_GETMULTICAST so that the
link-layer multicast addresses are reported the same way. Patch 4 dumps
dev->mc in the ifaddrmsg format of the IPv4 and IPv6 dumps: IFA_MULTICAST
carries the address, IFA_MC_USERS the reference count and a new
IFA_F_GLOBAL flag marks entries added explicitly, the "static" column of
/proc/net/dev_mcast. ifa_index limits the dump to one device and
IFA_TARGET_NETNSID selects another netns. Patches 2 and 3 add a
generation counter for dev->mc changes so a multi-part dump reports
NLM_F_DUMP_INTR like the IPv4 and IPv6 ones. Patches 1 and 5 update the
rt-addr spec and patch 6 adds a selftest.

AF_PACKET dumps returned -EOPNOTSUPP before, so iproute2 can keep the
procfs fallback for older kernels. The iproute2 side is ready and will
be posted once this is in.
====================

Link: https://patch.msgid.link/20261012011707.3378-1-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

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