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ath5k does multicast filtering in monitor mode

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Hello!

It turns out ath5k doesn't receive multicast packets while in monitor
mode.  Multicast packets are only received on the interface if it's set
to a promiscuous or allmulti mode of if the multicast address I need is
added by "ip maddr add".

Wireshark puts interfaces in promiscuous mode, but some utility I wrote
wasn't doing that, so it could not capture multicast packets with ath5k.

Do we have any standard whether multicast filtering is allowed in
monitor mode?  Should I fix ath5k or the userspace program?

-- 
Regards,
Pavel Roskin
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