Extend ROAM command to handle multiple SSIDs per BSS

Select the BSS entry based on BSSID,SSID pairs instead of just BSSID to
avoid selecting an unexpected SSID for the ROAM command.

Signed-hostap: Jouni Malinen <j@w1.fi>

wpa_supplicant/ctrl_iface.c

@@ -3513,7 +3513,13 @@ static int wpa_supplicant_ctrl_iface_roam(struct wpa_supplicant *wpa_s,
 
 	wpa_printf(MSG_DEBUG, "CTRL_IFACE ROAM " MACSTR, MAC2STR(bssid));
 
-	bss = wpa_bss_get_bssid(wpa_s, bssid);
+	if (!ssid) {
+		wpa_printf(MSG_DEBUG, "CTRL_IFACE ROAM: No network "
+			   "configuration known for the target AP");
+		return -1;
+	}
+
+	bss = wpa_bss_get(wpa_s, bssid, ssid->ssid, ssid->ssid_len);
 	if (!bss) {
 		wpa_printf(MSG_DEBUG, "CTRL_IFACE ROAM: Target AP not found "
 			   "from BSS table");
@@ -3525,12 +3531,6 @@ static int wpa_supplicant_ctrl_iface_roam(struct wpa_supplicant *wpa_s,
 	 * allow roaming to other networks
 	 */
 
-	if (!ssid) {
-		wpa_printf(MSG_DEBUG, "CTRL_IFACE ROAM: No network "
-			   "configuration known for the target AP");
-		return -1;
-	}
-
 	wpa_s->reassociate = 1;
 	wpa_supplicant_connect(wpa_s, bss, ssid);