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Re: [PATCH V4 2/2] cfg80211/nl80211: Enable drivers to implement mac address based ACL

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On Wednesday 02 January 2013 06:26 PM, Johannes Berg wrote:
On Mon, 2012-12-31 at 10:44 +0530, Vasanthakumar Thiagarajan wrote:

On Friday 28 December 2012 06:26 PM, Johannes Berg wrote:
On Fri, 2012-12-28 at 12:31 +0100, Johannes Berg wrote:
On Fri, 2012-12-28 at 15:51 +0530, Vasanthakumar Thiagarajan wrote:

V4:
	- Change it accordingly so that at any time the driver can
	  support either white or black list not both.

I was under the impression you needed both. Unless I get confirmation
from Kalle and/or Jouni I'll not apply this lest it needs to be changed
in yet again incompatible ways later ...

Actually I just talked to Jouni again and it seems that the best way to
think of the combined black/whitelist is to treat it as a whitelist +
"notification avoidance optimisation list". The key here being
optimisation, we don't really have to worry about it in terms of feature
advertising etc. since it can be ignored/managed by the driver.

Sure. Is the assumption here is the stations in optimisation list \
either be denied or allowed which is specific to driver?.

?
Basically we would have two modes:
  * whitelist
  * blacklist

(each might or might not be supported by the driver)

When a station is on the blacklist it's ignored. When it's on the
whitelist it's allowed. When it's on neither, but a list is configured,
an event might be sent. When there's a black-&  whitelist, the blacklist
is this an optimisation to suppress the event, so we don't need a third
mode "black- and whitelist supported".

Thanks!, I was really confused with this optimization part.
If I get it correctly, there needs to be a mechanism for
driver to advertise its dual list capability to user space.

Vasanth
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