wpa supplicant - WPA_supplicant authentication implementation -


i need have experience in playing wpa_supplicant code.

what understand wpa_supplicant dose in order supplicant connect ap (if what). hence steps as:

  1. scan
  2. get scan results
  3. auth
  4. assoc
  5. 4-hand shake
  6. data exchange

as understand first 4 steps managed wpa_supplicant. is, wpa_supplicant calls under laying driver perform these steps , after main event loop receives event_assoc msg. starts 4-handshake.

for part, fine first 2 steps carried out @ driver, ie., wpa_supplicant send scan req, driver perform scan , feed scan results.

my question is, correct wpa_supplicant cannot generate necessary packet , use, e.g., layer 2 (rawsocket) send authentication request ap ? , followed associate request ?... shall 1 provides these handle driver layer ?

as can see code in wpa_supplicant.c (void wpa_supplicant_associate(struct wpa_supplicant *wpa_s, struct wpa_bss *bss, struct wpa_ssid *ssid))

that function calls function pointer selected driver eg. ".associate = wpa_driver_nl80211_associate" , here driver send down udnerlaying nl80211 driver code ? .... wpa_supplicant can not generate these packet self ?

i hope make sens, if not please ask :)

yes, understanding correct. send auth/assoc req, wpa_supplicant should construct corresponding nl80211 commands in following different scenarios: a) in case sme maintained in wpa_supplicant

  • nl80211_cmd_authenticate
  • nl80211_cmd_associate

b) in case sme maintained driver

  • nl80211_cmd_connect

and these commands trigger corresponding cfg80211_ops hooks (.auth, .assoc, .connect) registered wifi driver called construct frames , send out frames.


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