On Thu, 2009-08-20 at 10:02 +0300, Rami Rosen wrote: > http://tuxology.net/wp-content/uploads/2009/08/wirelessLecHerzelinux.pdf had a quick look * almost all drivers support passive scanning -- all the modern ones at least -- maybe some old drivers don't, but all using cfg80211 do * your presentation is based on old code -- all the code stuff about scanning is already outdated in wireless-testing * you can scan for multiple specific SSIDs and channels: iw wlan0 scan freq 2412 ssid foo bar baz * iw has a better IE parser, so showing a result from that may be more instructive * code stuff about authentication/association is also outdated already * the STA_MLME_DISABLED stuff no longer exists * AP MLME will never be in the kernel, not just not in the near future :) * raw packets still go through the mac80211 stack, they arrive in monitor_start_xmit() or so * four-address format is not necessarily used only for WDS, the standard doesn't define uses for it (ToDS = FromDS = 1) * an AP may transmit nullfunc (!) frames to tell clients it has no data buffered, but it never transmits frames with the PM bit on * power timeout 5 is described incorrectly -- it doesn't go to sleep for 5 seconds, it actually stays awake for 5 seconds after each packet transmission -- the time spent asleep is calculated based on the DTIM period etc. Cf. 04fe20372e70685d9f15966216cdffd3795fe590. * STA may wake up in response to TIM[AID] == 1 instead of sending PS-poll, which we do depends on the timeout (iwconfig wlan0 power timeout 0 == PS-poll, iwconfig wlan0 power timeout 100ms == send nullfunc and stay awake for 100ms) * "paramter" typo * ibss is in net/mac80211/ibss.c and has been for quite a while * PM in IBSS is not implemented typically * s/80211.s/802.11s/ * s/80211.n/802.11n/ * you can change the channel with iw (iw phy set freq ...) but it isn't really useful unless you're AP/monitor (and rejected otherwise) * Fedora no longer updates from wireless-testing afaik * wmaster0 is no longer created * assigning interface_modes doesn't set the mode, it just sets the possible modes :) * you can also call iterate_interfaces_atomic() in irq context * nobody cares about the wireless extensions version any more :) * for sniffing you may care about "iw dev <devname> set monitor <flag>*" Hey that got long! johannes
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