#
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# This outlines the Linux authentication/association and
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# deauthentication/disassociation flows.
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#
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# This can be converted into a diagram using the service
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# at http://www.websequencediagrams.com/
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#
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participant userspace
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participant mac80211
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participant driver
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alt authentication needed (not FT)
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userspace->mac80211: authenticate
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alt authenticated/authenticating already
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mac80211->driver: sta_state(AP, not-exists)
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mac80211->driver: bss_info_changed(clear BSSID)
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else associated
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note over mac80211,driver
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like deauth/disassoc, without sending the
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BA session stop & deauth/disassoc frames
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end note
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end
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mac80211->driver: config(channel, channel type)
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mac80211->driver: bss_info_changed(set BSSID, basic rate bitmap)
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mac80211->driver: sta_state(AP, exists)
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alt no probe request data known
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mac80211->driver: TX directed probe request
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driver->mac80211: RX probe response
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end
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mac80211->driver: TX auth frame
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driver->mac80211: RX auth frame
|
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alt WEP shared key auth
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mac80211->driver: TX auth frame
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driver->mac80211: RX auth frame
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end
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mac80211->driver: sta_state(AP, authenticated)
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mac80211->userspace: RX auth frame
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end
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userspace->mac80211: associate
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alt authenticated or associated
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note over mac80211,driver: cleanup like for authenticate
|
end
|
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alt not previously authenticated (FT)
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mac80211->driver: config(channel, channel type)
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mac80211->driver: bss_info_changed(set BSSID, basic rate bitmap)
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mac80211->driver: sta_state(AP, exists)
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mac80211->driver: sta_state(AP, authenticated)
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end
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mac80211->driver: TX assoc
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driver->mac80211: RX assoc response
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note over mac80211: init rate control
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mac80211->driver: sta_state(AP, associated)
|
|
alt not using WPA
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mac80211->driver: sta_state(AP, authorized)
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end
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mac80211->driver: set up QoS parameters
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mac80211->driver: bss_info_changed(QoS, HT, associated with AID)
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mac80211->userspace: associated
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note left of userspace: associated now
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alt using WPA
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note over userspace
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do 4-way-handshake
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(data frames)
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end note
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userspace->mac80211: authorized
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mac80211->driver: sta_state(AP, authorized)
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end
|
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userspace->mac80211: deauthenticate/disassociate
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mac80211->driver: stop BA sessions
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mac80211->driver: TX deauth/disassoc
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mac80211->driver: flush frames
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mac80211->driver: sta_state(AP,associated)
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mac80211->driver: sta_state(AP,authenticated)
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mac80211->driver: sta_state(AP,exists)
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mac80211->driver: sta_state(AP,not-exists)
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mac80211->driver: turn off powersave
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mac80211->driver: bss_info_changed(clear BSSID, not associated, no QoS, ...)
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mac80211->driver: config(channel type to non-HT)
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mac80211->userspace: disconnected
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