eap_proxy: Add support for SIM state change indication from eap_proxy

This registers a new callback to indicate change in SIM state. This
helps to do some clean up (more specifically pmksa_flush) based on the
state change of the SIM. Without this, the reconnection using the cached
PMKSA could happen though the SIM is changed.

Currently eap_proxy_sim_state corresponds to only SIM_STATE_ERROR. This
can be further extended.

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>

src/common/defs.h

@@ -376,4 +376,8 @@ enum beacon_rate_type {
 	BEACON_RATE_VHT
 };
 
+enum eap_proxy_sim_state {
+	SIM_STATE_ERROR,
+};
+
 #endif /* DEFS_H */

src/eap_peer/eap.h

@@ -252,6 +252,14 @@ struct eapol_callbacks {
 	 * @ctx: eapol_ctx from eap_peer_sm_init() call
 	 */
 	void (*eap_proxy_cb)(void *ctx);
+
+	/**
+	 * eap_proxy_notify_sim_status - Notification of SIM status change
+	 * @ctx: eapol_ctx from eap_peer_sm_init() call
+	 * @sim_state: One of enum value from sim_state
+	 */
+	void (*eap_proxy_notify_sim_status)(void *ctx,
+					    enum eap_proxy_sim_state sim_state);
 #endif /* CONFIG_EAP_PROXY */
 
 	/**

src/eapol_supp/eapol_supp_sm.c

@@ -1999,6 +1999,7 @@ static void eapol_sm_notify_status(void *ctx, const char *status,
 
 
 #ifdef CONFIG_EAP_PROXY
+
 static void eapol_sm_eap_proxy_cb(void *ctx)
 {
 	struct eapol_sm *sm = ctx;
@@ -2006,6 +2007,18 @@ static void eapol_sm_eap_proxy_cb(void *ctx)
 	if (sm->ctx->eap_proxy_cb)
 		sm->ctx->eap_proxy_cb(sm->ctx->ctx);
 }
+
+
+static void
+eapol_sm_eap_proxy_notify_sim_status(void *ctx,
+				     enum eap_proxy_sim_state sim_state)
+{
+	struct eapol_sm *sm = ctx;
+
+	if (sm->ctx->eap_proxy_notify_sim_status)
+		sm->ctx->eap_proxy_notify_sim_status(sm->ctx->ctx, sim_state);
+}
+
 #endif /* CONFIG_EAP_PROXY */
 
 
@@ -2034,6 +2047,7 @@ static const struct eapol_callbacks eapol_cb =
 	eapol_sm_notify_status,
 #ifdef CONFIG_EAP_PROXY
 	eapol_sm_eap_proxy_cb,
+	eapol_sm_eap_proxy_notify_sim_status,
 #endif /* CONFIG_EAP_PROXY */
 	eapol_sm_set_anon_id
 };

src/eapol_supp/eapol_supp_sm.h

@@ -277,6 +277,14 @@ struct eapol_ctx {
 	 * @ctx: eapol_ctx from eap_peer_sm_init() call
 	 */
 	void (*eap_proxy_cb)(void *ctx);
+
+	/**
+	 * eap_proxy_notify_sim_status - Notification of SIM status change
+	 * @ctx: eapol_ctx from eap_peer_sm_init() call
+	 * @status: One of enum value from sim_state
+	 */
+	void (*eap_proxy_notify_sim_status)(void *ctx,
+					    enum eap_proxy_sim_state sim_state);
 #endif /* CONFIG_EAP_PROXY */
 
 	/**

wpa_supplicant/wpas_glue.c

@@ -893,6 +893,7 @@ static void wpa_supplicant_eap_param_needed(void *ctx,
 
 
 #ifdef CONFIG_EAP_PROXY
+
 static void wpa_supplicant_eap_proxy_cb(void *ctx)
 {
 	struct wpa_supplicant *wpa_s = ctx;
@@ -908,6 +909,25 @@ static void wpa_supplicant_eap_proxy_cb(void *ctx)
 		wpa_printf(MSG_DEBUG, "eap_proxy: IMSI not available");
 	}
 }
+
+
+static void
+wpa_supplicant_eap_proxy_notify_sim_status(void *ctx,
+					   enum eap_proxy_sim_state sim_state)
+{
+	struct wpa_supplicant *wpa_s = ctx;
+
+	wpa_printf(MSG_DEBUG, "eap_proxy: SIM card status %u", sim_state);
+	switch (sim_state) {
+	case SIM_STATE_ERROR:
+		wpa_sm_pmksa_cache_flush(wpa_s->wpa, NULL);
+		break;
+	default:
+		wpa_printf(MSG_DEBUG, "eap_proxy: SIM card status unknown");
+		break;
+	}
+}
+
 #endif /* CONFIG_EAP_PROXY */
 
 
@@ -1018,6 +1038,8 @@ int wpa_supplicant_init_eapol(struct wpa_supplicant *wpa_s)
 	ctx->eap_param_needed = wpa_supplicant_eap_param_needed;
 #ifdef CONFIG_EAP_PROXY
 	ctx->eap_proxy_cb = wpa_supplicant_eap_proxy_cb;
+	ctx->eap_proxy_notify_sim_status =
+		wpa_supplicant_eap_proxy_notify_sim_status;
 #endif /* CONFIG_EAP_PROXY */
 	ctx->port_cb = wpa_supplicant_port_cb;
 	ctx->cb = wpa_supplicant_eapol_cb;