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From: "Luis R. Rodriguez" <mcgrof@gmail.com>
Date: Thu, 7 Oct 2010 11:11:51 -0700
Message-ID: <AANLkTimTLEShJ3HcBqHaU5U5nFq1UywczC=G7oiHx=as@mail.gmail.com>
Subject: Re: Vendor specific data within a beacon frame
To: Bjoern Czybik <wlfw@gmx.com>
Cc: linux-wireless@vger.kernel.org
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Sender: linux-wireless-owner@vger.kernel.org

On Thu, Oct 7, 2010 at 2:31 AM, Bjoern Czybik <wlfw@gmx.com> wrote:
> Hi all,
>
> I am a student from Germany and a newbie to Linux device driver programming
> and the wireless drivers.
> We are using the ath5k device driver and hostapd.
>
> In our project we are looking to send some specific data within each beacon
> (should be set from the hostapd).
> In which struct can I set the vendor specific data in a beacon frame?

This can be done from userspace. This is from nl80211.h:


 * @NL80211_CMD_SET_MGMT_EXTRA_IE: Set extra IEs for management frames. The
 *      interface is identified with %NL80211_ATTR_IFINDEX and the management
 *      frame subtype with %NL80211_ATTR_MGMT_SUBTYPE. The extra IE data to be
 *      added to the end of the specified management frame is specified with
 *      %NL80211_ATTR_IE. If the command succeeds, the requested data will be
 *      added to all specified management frames generated by
 *      kernel/firmware/driver.
 *      Note: This command has been removed and it is only reserved at this
 *      point to avoid re-using existing command number. The functionality this
 *      command was planned for has been provided with cleaner design with the
 *      option to specify additional IEs in NL80211_CMD_TRIGGER_SCAN,
 *      NL80211_CMD_AUTHENTICATE, NL80211_CMD_ASSOCIATE,
 *      NL80211_CMD_DEAUTHENTICATE, and NL80211_CMD_DISASSOCIATE.

  Luis