Support fixing the BSSID in IBSS mode

When the "bssid=" option is set for an IBSS network and ap_scan = 2,
ask the driver to fix this BSSID, if possible.

Previously, any "bssid=" option were ignored in IBSS mode when ap_scan=2.

Signed-hostap: Nicolas Cavallari <cavallar@lri.fr>

src/drivers/driver.h

@@ -516,6 +516,13 @@ struct wpa_driver_associate_params {
 	 * STA mode: bits 0..3 UAPSD enabled for VO,VI,BK,BE
 	 */
 	int uapsd;
+
+	/**
+	 * fixed_bssid - Whether to force this BSSID in IBSS mode
+	 * 1 = Fix this BSSID and prevent merges.
+	 * 0 = Do not fix BSSID.
+	 */
+	int fixed_bssid;
 };
 
 enum hide_ssid {

wpa_supplicant/wpa_supplicant.c

@@ -1364,6 +1364,13 @@ void wpa_supplicant_associate(struct wpa_supplicant *wpa_s,
 		params.ssid = ssid->ssid;
 		params.ssid_len = ssid->ssid_len;
 	}
+
+	if (ssid->mode == WPAS_MODE_IBSS && ssid->bssid_set &&
+	    wpa_s->conf->ap_scan == 2) {
+		params.bssid = ssid->bssid;
+		params.fixed_bssid = 1;
+	}
+
 	if (ssid->mode == WPAS_MODE_IBSS && ssid->frequency > 0 &&
 	    params.freq == 0)
 		params.freq = ssid->frequency; /* Initial channel for IBSS */