linux-kernel - Re: [cfg80211 / iwlwifi] setting wireless regulatory domain doesn't work.

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Date:	Wed, 11 Dec 2013 19:38:50 +0100
From:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
To:	Sander Eikelenboom <linux@...elenboom.it>
Cc:	"Berg, Johannes" <johannes.berg@...el.com>,
	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ilw@...ux.intel.com" <ilw@...ux.intel.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"John W. Linville" <linville@...driver.com>
Subject: Re: [cfg80211 / iwlwifi] setting wireless regulatory domain doesn't work.

On Wed, Dec 11, 2013 at 7:11 PM, Sander Eikelenboom
<linux@...elenboom.it> wrote:
>
> Wednesday, December 11, 2013, 6:53:07 PM, you wrote:
>
>> The best way to address all this is by automatic region awareness and
>> doing the right thing on devices, this however requires good
>> architecture / calibration data  / etc and all that needs to be
>> verified by the system integrators, and finally they need to be
>> certified. If you want to hack your firmware and software go at it,
>> just be aware there are reasons for things.
>
> Well the general problem seems to be "we don't trust the user" so we FORCE him to the lowest
> common denominator (without a way to overrule that) so he is forced to operate *well* within the law.

Its simply stupid to have the user be involved, period, the fact that
a user would be involved should only be for testing or helping
compliance for a busted device, development, research and obviously
hacking. Linux allows all these but by default a device with firmware
and a custom regdomain that will barf if you try to use a channel that
is not allowed is a restriction in firmware. Feel free to reverse
engineer that if you don't like it but it just won't be supported or
go upstream. Now, the common denominator is generally optimized for
best performance as well so you shouldn't have to do anything, and for
APs -- this is typically carefully crafted for a region, also highly
optimized.

>>>> It doesn't seem like you are getting your original requests getting
>>>> processed, so I don't think CRDA is passing it. Can you verify running
>>>> from CRDA code:
>>>
>>> They don't get processed unless i remove the return from the code as i indicated.
>>> If i remove that return it processes the request.
>>>
>>>> ./regdbdump /usr/lib/crda/regulatory.bin
>>>
>>> Although it's in a different location on Debian, /lib/crda/regulatory.bin
>>> the dump seems fine.
>
>> OK thanks. Can you send a patch of what exact change you made, it was
>> unclear from the paste you made.
>
>> diff -u file.c.orig file.c
>
> Well i just did a pull from wireless-next, to try Avinash Patil's patch.
> net/wireless/reg.c had already changed much so i couldn't apply his patch without.
>
> With his patch it sets the regulatory domain, although as now expected i still can not use channels 12 and 13 yet,
> probably due to those firmware restrictions.

Its unclear what results you got, and yeah if the device is restricted
then its just the fw telling the driver its channels and you can't use
them. That's it. You won't be able to override information then unless
you hack the firmware.

  Luis
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