| Johannes Berg | 3cd7920 | 2012-03-09 17:25:33 +0100 | [diff] [blame^] | 1 | # |
| 2 | # This outlines the Linux authentication/association and |
| 3 | # deauthentication/disassociation flows. |
| 4 | # |
| 5 | # This can be converted into a diagram using the service |
| 6 | # at http://www.websequencediagrams.com/ |
| 7 | # |
| 8 | |
| 9 | participant userspace |
| 10 | participant mac80211 |
| 11 | participant driver |
| 12 | |
| 13 | alt authentication needed (not FT) |
| 14 | userspace->mac80211: authenticate |
| 15 | |
| 16 | alt authenticated/authenticating already |
| 17 | mac80211->driver: sta_state(AP, not-exist) |
| 18 | mac80211->driver: bss_info_changed(clear BSSID) |
| 19 | else associated |
| 20 | note over mac80211,driver |
| 21 | like deauth/disassoc, without sending the |
| 22 | BA session stop & deauth/disassoc frames |
| 23 | end note |
| 24 | end |
| 25 | |
| 26 | mac80211->driver: config(channel, non-HT) |
| 27 | mac80211->driver: bss_info_changed(set BSSID, basic rate bitmap) |
| 28 | mac80211->driver: sta_state(AP, exists) |
| 29 | |
| 30 | alt no probe request data known |
| 31 | mac80211->driver: TX directed probe request |
| 32 | driver->mac80211: RX probe response |
| 33 | end |
| 34 | |
| 35 | mac80211->driver: TX auth frame |
| 36 | driver->mac80211: RX auth frame |
| 37 | |
| 38 | alt WEP shared key auth |
| 39 | mac80211->driver: TX auth frame |
| 40 | driver->mac80211: RX auth frame |
| 41 | end |
| 42 | |
| 43 | mac80211->driver: sta_state(AP, authenticated) |
| 44 | mac80211->userspace: RX auth frame |
| 45 | |
| 46 | end |
| 47 | |
| 48 | userspace->mac80211: associate |
| 49 | alt authenticated or associated |
| 50 | note over mac80211,driver: cleanup like for authenticate |
| 51 | end |
| 52 | |
| 53 | alt not previously authenticated (FT) |
| 54 | mac80211->driver: config(channel, non-HT) |
| 55 | mac80211->driver: bss_info_changed(set BSSID, basic rate bitmap) |
| 56 | mac80211->driver: sta_state(AP, exists) |
| 57 | mac80211->driver: sta_state(AP, authenticated) |
| 58 | end |
| 59 | mac80211->driver: TX assoc |
| 60 | driver->mac80211: RX assoc response |
| 61 | note over mac80211: init rate control |
| 62 | mac80211->driver: sta_state(AP, associated) |
| 63 | |
| 64 | alt not using WPA |
| 65 | mac80211->driver: sta_state(AP, authorized) |
| 66 | end |
| 67 | |
| 68 | mac80211->driver: set up QoS parameters |
| 69 | |
| 70 | alt is HT channel |
| 71 | mac80211->driver: config(channel, HT params) |
| 72 | end |
| 73 | |
| 74 | mac80211->driver: bss_info_changed(QoS, HT, associated with AID) |
| 75 | mac80211->userspace: associated |
| 76 | |
| 77 | note left of userspace: associated now |
| 78 | |
| 79 | alt using WPA |
| 80 | note over userspace |
| 81 | do 4-way-handshake |
| 82 | (data frames) |
| 83 | end note |
| 84 | userspace->mac80211: authorized |
| 85 | mac80211->driver: sta_state(AP, authorized) |
| 86 | end |
| 87 | |
| 88 | userspace->mac80211: deauthenticate/disassociate |
| 89 | mac80211->driver: stop BA sessions |
| 90 | mac80211->driver: TX deauth/disassoc |
| 91 | mac80211->driver: flush frames |
| 92 | mac80211->driver: sta_state(AP,associated) |
| 93 | mac80211->driver: sta_state(AP,authenticated) |
| 94 | mac80211->driver: sta_state(AP,exist) |
| 95 | mac80211->driver: sta_state(AP,not-exist) |
| 96 | mac80211->driver: turn off powersave |
| 97 | mac80211->driver: bss_info_changed(clear BSSID, not associated, no QoS, ...) |
| 98 | mac80211->driver: config(non-HT channel type) |
| 99 | mac80211->userspace: disconnected |