IBSS channel support

IBSS channel support

[p4u]

Hi,
This is my first mail to this list, I'm Pau from Barcelona working in 
guifi.net (wireless community)
First of all I want to say thank you guys for your amazing job :-)

Now, I have a little question. Using command "iw phy phy0 info" I can 
see that IBSS mode is only avaiable in some channels for 5ghz spectrum. 
I have been looking for information about it, but I cannot find from 
what depends if some channel can by used in IBSS mode or not. So I think 
it depends on the driver and on the regdomain, is it right?

Also I'm working in some scripts, and I need to know if a channel has 
IBSS support or not. The only way I found is with iw command, but pharse 
this data is very dirty. Furthermore I can read in the end of iw help:

"Do NOT screenscrape this tool, we don't consider its output stable."

So I need another way to get this information. Any idea?

Thank you.

-- 
./p4u

Re: IBSS channel support

[Dan Williams]

On Fri, 2011-07-29 at 17:27 +0200, p4u wrote:
> Hi,
> This is my first mail to this list, I'm Pau from Barcelona working in 
> guifi.net (wireless community)
> First of all I want to say thank you guys for your amazing job :-)
> 
> Now, I have a little question. Using command "iw phy phy0 info" I can 
> see that IBSS mode is only avaiable in some channels for 5ghz spectrum. 
> I have been looking for information about it, but I cannot find from 
> what depends if some channel can by used in IBSS mode or not. So I think 
> it depends on the driver and on the regdomain, is it right?

Yes.

> Also I'm working in some scripts, and I need to know if a channel has 
> IBSS support or not. The only way I found is with iw command, but pharse 
> this data is very dirty. Furthermore I can read in the end of iw help:
> 
> "Do NOT screenscrape this tool, we don't consider its output stable."
> 
> So I need another way to get this information. Any idea?

Couldn't you use the CRDA database?  That's got bits that indicate
whether or not some channels allow IBSS in your domain or not.

http://wireless.kernel.org/download/wireless-regdb/

Dan

Re: IBSS channel support

[p4u]

Thanks.
I think I can use it

On 29/07/11 17:54, Dan Williams wrote:
> On Fri, 2011-07-29 at 17:27 +0200, p4u wrote:
>> Hi,
>> This is my first mail to this list, I'm Pau from Barcelona working in
>> guifi.net (wireless community)
>> First of all I want to say thank you guys for your amazing job :-)
>>
>> Now, I have a little question. Using command "iw phy phy0 info" I can
>> see that IBSS mode is only avaiable in some channels for 5ghz spectrum.
>> I have been looking for information about it, but I cannot find from
>> what depends if some channel can by used in IBSS mode or not. So I think
>> it depends on the driver and on the regdomain, is it right?
> Yes.
>
>> Also I'm working in some scripts, and I need to know if a channel has
>> IBSS support or not. The only way I found is with iw command, but pharse
>> this data is very dirty. Furthermore I can read in the end of iw help:
>>
>> "Do NOT screenscrape this tool, we don't consider its output stable."
>>
>> So I need another way to get this information. Any idea?
> Couldn't you use the CRDA database?  That's got bits that indicate
> whether or not some channels allow IBSS in your domain or not.
>
> http://wireless.kernel.org/download/wireless-regdb/
>
> Dan
>
>


-- 
./p4u

Re: IBSS channel support

[Johannes Berg]

On Fri, 2011-07-29 at 17:27 +0200, p4u wrote:
> Hi,
> This is my first mail to this list, I'm Pau from Barcelona working in 
> guifi.net (wireless community)
> First of all I want to say thank you guys for your amazing job :-)
> 
> Now, I have a little question. Using command "iw phy phy0 info" I can 
> see that IBSS mode is only avaiable in some channels for 5ghz spectrum. 
> I have been looking for information about it, but I cannot find from 
> what depends if some channel can by used in IBSS mode or not. So I think 
> it depends on the driver and on the regdomain, is it right?
> 
> Also I'm working in some scripts, and I need to know if a channel has 
> IBSS support or not. The only way I found is with iw command, but pharse 
> this data is very dirty. Furthermore I can read in the end of iw help:
> 
> "Do NOT screenscrape this tool, we don't consider its output stable."
> 
> So I need another way to get this information. Any idea?

Copy bits of the wpa_supplicant or iw code into your code to get this
information. That said, iw output _should_ be fairly stable, in this
area.

johannes