Maybe I got an answer.
When entering AUTHENTICATION state, it calls macro:
SM_ENTRY_MA(WPA_PTK, AUTHENTICATION, wpa_ptk)
and this macro is defined as following:
#define SM_ENTRY_MA(machine, _state, date) \
/* omitted */
sm->data ## _ ## state = machine ## _ ## _state;
which will be preprocessed as sm->wpa_ptk_state = WPA_PTK_AUTHENTICATION
I had a difficulty since it is defined by macro with concatenation so
that it cannot be captured by search functionality of general text
editor.
Regards,
Jeon.
---------- Forwarded message ----------
From: Jeon <sjeon87+hostap@xxxxxxxxx>
Date: Fri, Nov 11, 2016 at 4:01 PM
Subject: From where WPA_PTK state machine enters AUTHENTICATION2 state?
To: hostap@xxxxxxxxxxxxxxxxxxx
I am investigating on procedure of WPA_PTK state machine.
So far, I've found a normal transition procedure based on a log file
[1] as following:
INITIALZE -> AUTHENTICATION -> AUTHENTICATION2 -> INITPSK -> PTKSTART
(sending 1/4 Eapol-Key) -> PTKCALCNEGOTIATING -> PTKCALCNEGOTIATING2
-> PTKINITNEGOTIATING -> PTKINITDONE
Also, I've found that the state machine enters INITIALIZE state by invoking:
wpa_auth_sta_associated() -> sm->Init = TRUE -> wpa_sm_step() ->
SM_STEP_RUN(WPA_PTK) -> SM_ENTER(WPA_PTK, INITIALIZE)
And the state machine enters AUTHENTICATIOIN state by invoking:
wpa_auth_sta_associated() -> sm->AuthenticationRequest = TRUE ->
wpa_sm_step() ->SM_STEP_RUN(WPA_PTK) -> SM_ENTER(WPA_PTK,
AUTHENTICATION)
However, I couldn't find a location that makes the state machine enter
AUTHENTICATION2 state after AUTHENTICATION state. The state machine
enters the state when:
1. if (sm->ReAuthenticationRequest)
or
2. swtich(sm->wpa_ptk_state) {case WPA_PTK_AUTHENTICATION}.
But for normal association procedure, ReAuth is not the case. Hence, I
need to find where the source code sets sm->wpa_ptk_state =
WPA_PTK_AUTHENTICATION. However, I couldn't find it.
Could anyone please give me a hint for this?
Regards,
Jeon.
[1] https://gist.github.com/gsongsong/d25d0856a289b98c143b7b8f192a969c#file-hostapd-wpa2-log-L6
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