On Wed, Mar 19, 2008 at 10:10 PM, Jouni Malinen <j@xxxxx> wrote: > On Wed, Mar 19, 2008 at 08:41:22PM +0200, Tomas Winkler wrote: > > > So how do you call WEP key that is used for both unicast and broadcast > > i.e the old WEP key. > > The IEEE 802.11 name for this would be "default key". IEEE 802.1X (or > well, RFC 3580 is the authoritative specification for this) calls it > "broadcast (default key)". Please note that this is not really a key > that is always used both for unicast and broadcast. If there is a > key-mapping key (unicast/individual) for the matching > transmitter/receiver addresses, that key will be used instead. The "old > WEP key" way of using only statically configured default keys just does > not set the key-mapping key and because of that, the default key ends up > being used for all frames (or well, one of the possible four default > keys). > > > > What mac80211 currently does it's attach it to broadcast address. If > > there is a group key re keying you don't know whether also unicast key > > have to be overridden or not since you don't know if this is a > > 'static/global; key or dynamic group key > > I haven't looked at what the current implementation does, but as far as > WEXT and SIOCSIWENCODEEXT is concerned, IW_ENCODE_EXT_GROUP_KEY flag > should be used to select which key is being configured. There is no > difference between "static/global" and "dynamic group" keys. The only > difference is between default and key-mapping (individual) keys. > > Sure, the terminology here can be quite confusing, but as far as I can > tell, that IW_ENCODE_EXT_GROUP_KEY flag is all that is needed to > distinguish which key is being configured and configuring a single key > should not automatically change another one (even if the key index is > same which could, at least in theory, happen with key index 0 that can > be used both with default and key-mapping keys). > Just trying to translate it to configuration flow: To determine if the key is old-WEP would be Use group key as default key for all traffic unless and key-mapping key was set Is that correct? I will check how difficult is to do that implementation wise Thanks Tomas > > -- > 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
