Howto 802.11r

[Carlos Fernández]

Here is what I did using simulated WLAN with mac80211hwsim. Maybe
it serves as starting-point.
The problems I encountered I will comment in another mail, after
analyzing a bit more with the current head, because I was using
0.7.3 and git from Feb 16.

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Before making hostapd the configuration has to be changed a bit,
beginning with the default. Copy defconfig to .config and modify
.config:
CONFIG_DRIVER_WIRED=y
CONFIG_DRIVER_NL80211=y
CONFIG_DRIVER_NONE=y
CONFIG_RADIUS_SERVER=y
CONFIG_IEEE80211R=y
CONFIG_DEBUG_FILE=y
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make
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Do similar to make wpa_supplicant:
CONFIG_DRIVER_NL80211=y
CONFIG_EAPOL_TEST=y
CONFIG_READLINE=y
CONFIG_IEEE80211R=y
CONFIG_DEBUG_FILE=y
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make
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The config files to run the applications you find in the attached tgz-file.
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The configuration changes with respect to the real hardware (on my
computer wlan0 is used by real WLAN, so instructions use wlan1 to 3).
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Install vtun, if not present:
aptitude install vtun
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Start vtun (to create and connect tap interfaces):
vtun -s -f vtund.server.conf
vtun -f vtund.client.conf conn1 127.0.0.1
ifconfig tap0 up
ifconfig tap1 up
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Create and configure two bridges:
brctl addbr br0
brctl setfd br0 0
brctl addif tap0
ifconfig br0 192.168.168.101
ifconfig br0 up
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brctl addbr br1
brctl setfd br1 0
brctl addif tap1
ifconfig br1 192.168.168.102
ifconfig br1 up
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--> br0 and br1 should be connected now.
(The tap devices and vtun are needed because bridges cannot be connected directly.)
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TODO: add test for bridges here
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Start virtual wireless networking:
modprobe mac80211_hwsim radios=3
--> this will create 3 interfaces wlan[1:3]
??? (Starts with 1 if wlan0 is already used by PCI WLAN card.
??? adapt configuration and commands below if this is different.)
??? Mac addresses are 02:00:00:00:0x:00 with x = 0 to 2.
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Make wireless traffic visible to sniffer:
ifconfig hwsim0 up
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Adapt the following commands, to make sure you are using the newly built
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versions of hostap and wpa_supplicant.
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One will need some windows with shells to keep applications in foreground.
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I use 5: two for the hostapds, one for the wpa_supplicant, one for wpa_cli,
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one for a shell for iwconfig and test the connection.
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Start the hostapd with config file for AP0 and AP1:
~/hostap/hostapd/hostapd hostap0.hwsim.conf
~/hostap/hostapd/hostapd hostap1.hwsim.conf
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Verify if the APs are alive:
ifconfig wlan3 up
iwlist wlan3 scanning
--> two APs with ESSID "ft-psk" should appear on channel 1 and 2
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Start wpa_supplicant:
~/hostap/wpa_supplicant/wpa_supplicant -Dnl80211 -iwlan3 -c wpasup.conf -d
--> should connect to one of the APs
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Configure the STA interface:
ifconfig wlan3 192.168.168.103
ifconfig wlan3 up
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TODO: add tests for overall connection here
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Use sniffer with interface hwsim0 see all traffic on air.
Use sniffer with interface tap0 or tap1 see all traffic on "cable"
between the APs.

 		 	   		  
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