Re: [PATCH] mac80211: add support for userspace to handle auth frames on adhoc ifaces

[Johannes Berg <johannes@sipsolutions.net>]

On Thu, 2012-06-14 at 10:00 +0200, Nicolas Cavallari wrote:

> I just have a question here : when auth frames are not delivered to
> userspace, mac80211 will respond to them, and also uses them to detect
> node reboot. If you register for auth frames, mac80211 will still send
> auth frames as soon as a new station is seen, which might be confusing
> for user space. Is that ok to do this ? Or should userspace have more
> control over how mac80211 sends auth frames ?

Please read the code. If userspace registers for them, mac80211 will
never do anything with the frame.

> There is also another thing to consider if you want to send auth frames
> from userspace, as CMD_FRAME requires a frequency, which in IBSS mode,
> can change anytime without userspace being notified. If you only have to
> answer to received auth frames, this is easier as you can reuse the
> frequency given by nl80211 when receiving the auth frame. But if you
> want to send a auth frame independently, how do you get the frequency to
> use ?

You check the BSS info, that's trivial.

johannes