On Thu, 2017-05-25 at 08:40 +1000, Tobin C. Harding wrote: > On Wed, May 24, 2017 at 08:06:40PM +0200, Johannes Berg wrote: > > Just a small correction: > > > > On Wed, 2017-05-24 at 11:44 -0500, Dan Williams wrote: > > > > > > For RSN, they are 1 = PMK, 2 = GMK, 3 = GMK2, 4 seems unused. > > > > PTK and GTK, and in theory you could have more than two GTKs but > > that's > > not usually done. > > Excuse my ignorance but why do you say PTK and GTK here? Who > generates > the transient keys, hardware, firmware or software? Is this device > specific or is there a *normal* way? > > From the nomenclature in the WEXT driver I thought the driver > supplied the > master keys to the firmware and transient keys were generated at the > firmware layer or lower.
Usually the supplicant supplies only the PTK/GTK to the driver at the right times (like during the 4-way handshake). It looks like the driver only refers to PMK/GMK when using the rx_seq[] bits, while the actual WPA keys are probably the PTK/GTK. While it's not the best example, see drivers/net/wireless/marvell/libertas/cfg.c and lbs_cfg_connect() and lbs_cfg_add_key(). That should translate fairly well to the ks7010 driver. The important parts you'll get from nl80211 are add_key/del_key and set_default_key. The connect hook gets called first to tell the driver to start the auth/assoc process to a given AP, and that's where you'd set up the general stuff like whether or not you'll use WEP or WPA, what the SSID/BSSID are, whether PSK or EAPOL/802.1x, rates, etc. Then after that you'll get the add_key hook that actually sends the real keys to the driver when the supplicant has calculated them. Dan
