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@startuml
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skinparam SequenceMessageAlign center
participant HAL as "WiFi HAL Wrapper"
participant HOSTAP as "hostap"
participant DRIVER as "WiFi Driver"
participant LINUX as "Linux System"
participant STA as "Client Device"

group client authentication (WPA2 and WPA3 handshakes)
group mlme
STA -> DRIVER: Auth Frame
DRIVER -> HAL: process_mgmt_frame(NL80211_ATTR_FRAME, frame = auth)
HAL -> HOSTAP: wpa_supplicant_event(EVENT_RX_MGMT, event.frame = frame)
HOSTAP -> HAL: send_mlme(auth)
HAL -> DRIVER: wifi_drv_send_mlme(auth)
DRIVER -> STA: Auth Frame
STA -> DRIVER: Assoc Req Frame
DRIVER -> HAL: process_mgmt_frame(NL80211_ATTR_FRAME, frame = assoc req)
HAL -> HOSTAP: wpa_supplicant_event(EVENT_RX_MGMT, event.frame = assoc req)
HOSTAP -> HAL: send_mlme(assoc resp)
HAL -> DRIVER: wifi_drv_send_mlme(assoc resp)
DRIVER -> STA: Assoc Resp Frame
DRIVER -> HAL: nl80211_event(NL80211_CMD_FRAME_TX_STATUS)
HAL -> HOSTAP: wpa_supplicant_event(EVENT_TX_STATUS)
end
group non-mlme
STA -> DRIVER: Auth Frame
DRIVER -> STA: Auth Frame
STA -> DRIVER: Assoc Req Frame
DRIVER -> STA: Assoc Resp Frame
DRIVER -> HAL: nl80211_event(NL80211_CMD_NEW_STATION)
HAL -> HOSTAP: wpa_supplicant_event(EVENT_TX_ASSOC)
end
note over HOSTAP
    start 802.1x authentication
end note
HOSTAP -> HAL: hapd_send_eapol(EAPOL 1/4)
HAL -> DRIVER: bridge_tx(EAPOL 1/4)
DRIVER -> STA: EAPOL 1/4
STA -> DRIVER: EAPOL 2/4
DRIVER -> HAL: bridge_rx (EAPOL 2/4)
HAL -> HOSTAP: wpa_supplicant_event(EVENT_EAPOL_RX, event.frame = eapol)
HOSTAP -> HAL: hapd_send_eapol(EAPOL 3/4)
HAL -> DRIVER: bridge_tx(EAPOL 3/4)
DRIVER -> STA: EAPOL 3/4
STA -> DRIVER: EAPOL 4/4
DRIVER -> HAL: bridge_rx (EAPOL 4/4)
HAL -> HOSTAP: wpa_supplicant_event(EVENT_EAPOL_RX, event.frame = eapol)
HOSTAP -> HAL: set_key
HAL -> DRIVER: wifi_drv_set_key
HOSTAP -> HAL: set_sta_flags
HAL -> DRIVER: wifi_drv_set_sta_flags
end

@enduml