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SubjectRe: Support for Android for mac80211 / cfg80211 802.11 drivers
On Wed, Feb 02, 2011 at 12:33:54PM +0100, Johannes Berg wrote:
> What's the driver_cmd things they use? If we they add support for
> whatever it is to nl80211, why can those not be normal supplicant
> interfaces?

I have not reviewed what exactly gets used and how, so this is only
based on what the modification for wpa_supplicant are exposing.

There seems to be some kind of mechanism for stopping/starting/reloading
the driver which I do not fully understand. It includes some kind of
driver hang detection and maybe recovery from that etc..

Then there is a very generic mechanism of passing any command from user
space (i.e., command string to a SIOCSIWPRIV) and that goes
transparently through wpa_supplicant.. The response comes back as a
string. In other words, you could implement pretty much anything in a
driver specific way with that.. At least following commands are used or
have used with that: RSSI, LINKSPEED, MACADDR, GETPOWER, GETBAND.

Since it is difficult to tell just from wpa_supplicant changes what
exactly is done with these interfaces, the answer to the question of
why these could not be normal supplicant interfaces is not immediately
clear to me. I would assume that some of this functionality could
certainly be added once identified clearly what is needed. Some may
already be available (like MACADDR; assuming it is used to fetch local
MAC address).

--
Jouni Malinen PGP id EFC895FA


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