On Sun, May 24, 2009 at 07:24:46PM +0200, Johannes Berg wrote: > On Sun, 2009-05-24 at 09:19 -0400, Dan Williams wrote: > > On Sat, 2009-05-23 at 10:24 +0200, Johannes Berg wrote: > > > On Fri, 2009-05-22 at 20:09 -0400, Dan Williams wrote: > > > > Oddly enough, the firmware's JOIN/START commands don't appear to have > > > > any facility for setting custom IEs, thus the started adhoc network > > > > doesn't advertise its WPA capability in the beacon. Whee! > > > > > > We don't even properly support WPA IBSS in mac80211... > > > > Hmm, I support creating WPA-PSK adhoc networks in the NM UI (worked last > > summer when I added the code), can you give a 10 second summary of > > what's missing here? > > Hm, well, Jouni says it doesn't play well with XP or Vista and we don't > have per-station group keys we'd need in theory. Please note that "WPA IBSS" and "RSN IBSS" are two quite different beasts. WPA (as in the old v1 before IEEE 802.11i was finished) introduced a WPA-None mode in which there is actually no key management and the TKIP (or CCMP) key is pre-configured on the stations. This interoperates to more or less the extent possible (the mode itself is not really very nice design taken into account the replay protection and no mechanism to deliver current packet number). I do not know how strictly various implementations require the WPA IE to be in the Beacon frames for WPA IBSS/WPA-None to work. RSN IBSS (the mechanism introduced in the IEEE 802.11i-2004 and in theory, included in WPA2, but not really interop tested that much) includes full authentication and key management step similarly to the managed AP--station case. This is likely to require the Beacon and Probe Response frames to include the correct RSN IE. I haven't tested RSN IBSS with XP (and don't even know a driver that would support it there), but as far as brief tests with Vista are concerned, there seemed to be some interop issues in the 4-way handshake. Anyway, we do not yet have the needed support for this in mac80211 (per-STA GTK/group key). -- Jouni Malinen PGP id EFC895FA -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
