[PATCH] Multicast refcounting in network stack

Hi,

A patch against -CURRENT is now available:
http://people.freebsd.org/~bms/dump/multi_refcounting.diff

This is a fairly sweeping architectural change which should resolve memory leaks and potential panics with the network stack as a whole, to better support interface detach at runtime.

I'd like to check it in as soon as possible as it fixes the root cause of the problems we have had with carp and pfsync in our stack. NetBSD has implemented refcounting like this for some time now, so it does not suffer from the same problems.

Regards,
BMS
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