Request feedback on IPv6 multicast listen on ::

[Bruce Simpson]

During the MLDv2 refactoring, I removed some old KAME code which 
supports the ability to listen to *all* multicast groups.
It isn't clear to me whether this code was still in use, and I couldn't 
find information about it in the normative RFCs (2292, 3542) for IPv6 
stack implementation.

This call needed super-user privileges to use, and I'm not sure if 
anything is actually using it. Can anyone out there with possible 
exposure to it clarify?

I can find a way to re-introduce it if needed, but I suspect it is very 
old code which may not have actually been used (it dates back to the 
initial KAME fork).

cheers,
BMS