From: Jouni Malinen (jkmaline_at_cc.hut.fi)
Date: 2002-03-13 18:41:19 UTC
On Sun, Mar 03, 2002 at 02:05:27PM +0200, Jouni Malinen wrote:
> I have confirmed that there are problems with sending 4-address frames
> in Host AP mode (i.e., data frames with both FromDS and ToDS and four
> address fields). I tested station firmware versions 0.7.6 and 0.8.0, but
> apparently this problem is also present in newer 0.8 versions.
Now I tested this with a newer station firmware (1.3.4) and the same problem remains. However, I also tested ad hoc modes (both real IEEE 802.11 and pseudo) and in these modes the card is able to send valid WDS frames (FromDS & ToDS and four addresses).
I think I will implement WDS with the non-standard frame format first. It would then be easy to change to use IEEE 802.11 format if a method for sending that kind of frames is discovered.
I might also check whether it would be feasible to implement AP functionality in an ad hoc mode, i.e., by taking care of beacon and probe response frames in addition to the other Host AP mode functionality. This would bring more timing constraint for the host driver, but this might be doable and it would avoid certain Host AP mode related problems.
I would like to use pseudo ad hoc mode for this, but it will probably not support RTS/CTS frames so real IBSS might be better, although there will probably be bogus beacon frames (unless card RAM cannot be easily corrupted, e.g., by using a buffer overflow with a certain rid ;-)).
-- Jouni Malinen PGP id EFC895FA