Re: AD-Hoc network specify channel

[Dan Williams <dcbw redhat com>]

On Tue, 2010-04-13 at 21:36 +0200, Simon Schampijer wrote:
> Hi,
> 
> I am trying to create an Ad-Hoc Network with a specific channel. From 
> the spec [1] I know that I have to set the band as well. However the 
> created network always has channel 1. The nm-applet does not have an 
> option to set the channel, and is using channel one, too.
> 
> Using iwconfig to create an Ad-Hoc network I can set a channel fine. Is 
> it fully implemented or do I miss something else?

It should be, though it's likely not possible if you're using
nm-connection-editor since the channel/band aren't accessible there.
But looking at it now, they *should* be accessible for ad-hoc
connections.  So we'll need to whip up some code for page-wifi.c to
hide/show them when ad-hoc is selected.

(this is because wpa_supplicant only has the ability to set the channel
for ad-hoc networks, not a limitation in NM.  wpa_supplicant does not
have the ability to set a band limitation for infrastructure networks,
which means we can't let users limit particular connection to only
802.11a for example)

See nm_supplicant_config_add_setting_wireless() in NM for where the
frequency gets sent to the supplicant, and build_supplicant_config() for
where the channel/band get translated into a frequency.

Also check nm_ap_new_fake_from_connection() to ensure that the frequency
is getting correctly set on the fake AP.

This all should work as long as the connection dict has the band/freq
specified.

Dan