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DEAUTH messages can come from a number of different sources. The one that's hurting us currently is DEAUTH netlink messages coming to us from compat-wireless in response to local_state_change DEAUTH messages we sent as a part of cleaning up state in driver_nl80211's clear_state_mismatch() function. However, DEAUTH messages can come from a variety of unwanted sources, including directed denial-of-service attacks (although MAC verification doesn't place that high a barrier), so this validation is actually generically useful, I think. The downside to this method is that without a kernel based approach "iw dev wlan0 link" no longer works correctly after clear_state_mismatch() is done. This will be pursued with the kernel folks.
wpa_supplicant and hostapd v0.6.x --------------------------------- Copyright (c) 2002-2007, Jouni Malinen <j@w1.fi> and contributors All Rights Reserved. These program is dual-licensed under both the GPL version 2 and BSD license. Either license may be used at your option. This package may include either wpa_supplicant, hostapd, or both. See README file respective subdirectories (wpa_supplicant/README or hostapd/README) for more details. Source code files have been moved around in v0.6.x releases and compared to earlier releases, the programs are now build by first going to a subdirectory (wpa_supplicant or hostapd) and creating build configuration (.config) and running 'make' there (for Linux/BSD/cygwin builds).