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[RFC/RFT 0/2] userspace station-mode action frame handling

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Jouni, all,

These two patches now implement returning unknown
action frames and registering for certain action
frames from userspace, as well as sending as before.

A few design decisions:
 * AP mode is unchanged, hostapd is responsible for
   returning unknown action frames (cooked monitor).
 * Registration/transmission works only in station
   mode (would be easy to change in the future).
 * Registration needs to specify which frames to receive
   by providing a frame match buffer, which matches
   the first few bytes of the frame, so for instance
   the buffer [0x04] would register for all public
   action frames, and [0x7f, 0x00, 0x02, 0xb3] would
   register for certain Intel vendor action frames.
 * Action frames that are registered for are unicast
   to the socket that registered for it.
 * If userspace wants to know about returned action
   frames for ones it sent, it needs to register
   for them specifically, for my example above it
   would be [0xff, 0x00, 0x02, 0xb3].

johannes

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