Re: about 802.11i IBSS support

[Johannes Berg <johannes@sipsolutions.net>]

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On Wed, 2006-10-25 at 08:48 -0700, Jouni Malinen wrote:

> > 1. for the d80211 part: I don't think there will be much efforts.
> >    We may add a group key to each sta_info for decrypting multicast data from that STA.
> >    And in RX path, we need to add code to select the correct group key for decryption.
> >    And also we need to store our own group key used to send multicast data to others.
> 
> This will also include looking into how different WLAN chipsets
> have implemented (or will implement) hardware acceleration for such a
> case.

For bcm43xx, you can use any key for TX. At RX, the mac address of the
sender is used to look up which key to use (broadly spoken). But if the
frame is multicast, bcm43xx can only use the 4 default keys if enabled.
That said, we're recently started to reverse engineer the firmware and I
can see that it should be trivial to also do a mac address matching for
multicast frames and use different keys then.

johannes

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