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Track the number of matches installed for a given multicast group, and leave the
group once no matches depend on it.
In order to handle passed-in sockets that are already members of multicast groups
we initialize the refcount based on the membership once we take over the socket.
This way we will leave the socket in the state we found it once we finish with
it.
On kernels that do not fully support reading out the multicast group membership
we fall back to never leaving any groups (as before).
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Also, explicitly don't support subscribing to GET or SET messages, as these will
never be emitted by the kernel.
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This is a follow-up to #907, and makes the same change for all our other
public APIs.
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AF_NETLINK is not write-buffered, so this was actually never used.
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