MBO: Parse MBO ANQP-element on STA

This extends the GAS/ANQP parser in wpa_supplicant to process MBO
ANQP-elements and indicate received Cellular Data Connection Preference
values over the control interface.

When a valid MBO ANQP-element is received, the following control
interface message is sent:

RX-MBO-ANQP <BSSID> cell_conn_pref=<value>

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

src/common/wpa_ctrl.h

@@ -234,6 +234,7 @@ extern "C" {
 #define RX_HS20_ANQP "RX-HS20-ANQP "
 #define RX_HS20_ANQP_ICON "RX-HS20-ANQP-ICON "
 #define RX_HS20_ICON "RX-HS20-ICON "
+#define RX_MBO_ANQP "RX-MBO-ANQP "
 
 #define HS20_SUBSCRIPTION_REMEDIATION "HS20-SUBSCRIPTION-REMEDIATION "
 #define HS20_DEAUTH_IMMINENT_NOTICE "HS20-DEAUTH-IMMINENT-NOTICE "

wpa_supplicant/interworking.c

@@ -2912,7 +2912,6 @@ static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
 			return;
 
 		switch (WPA_GET_BE24(pos)) {
-#ifdef CONFIG_HS20
 		case OUI_WFA:
 			pos += 3;
 			slen -= 3;
@@ -2923,19 +2922,26 @@ static void interworking_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
 			slen--;
 
 			switch (type) {
+#ifdef CONFIG_HS20
 			case HS20_ANQP_OUI_TYPE:
 				hs20_parse_rx_hs20_anqp_resp(wpa_s, bss, sa,
 							     pos, slen,
 							     dialog_token);
 				break;
+#endif /* CONFIG_HS20 */
+#ifdef CONFIG_MBO
+			case MBO_ANQP_OUI_TYPE:
+				mbo_parse_rx_anqp_resp(wpa_s, bss, sa,
+						       pos, slen);
+				break;
+#endif /* CONFIG_MBO */
 			default:
 				wpa_msg(wpa_s, MSG_DEBUG,
-					"HS20: Unsupported ANQP vendor type %u",
+					"ANQP: Unsupported ANQP vendor type %u",
 					type);
 				break;
 			}
 			break;
-#endif /* CONFIG_HS20 */
 		default:
 			wpa_msg(wpa_s, MSG_DEBUG,
 				"Interworking: Unsupported vendor-specific ANQP OUI %06x",

wpa_supplicant/mbo.c

@@ -549,3 +549,31 @@ struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
 
 	return anqp_buf;
 }
+
+
+void mbo_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
+			    struct wpa_bss *bss, const u8 *sa,
+			    const u8 *data, size_t slen)
+{
+	const u8 *pos = data;
+	u8 subtype;
+
+	if (slen < 1)
+		return;
+
+	subtype = *pos++;
+	slen--;
+
+	switch (subtype) {
+	case MBO_ANQP_SUBTYPE_CELL_CONN_PREF:
+		if (slen < 1)
+			break;
+		wpa_msg(wpa_s, MSG_INFO, RX_MBO_ANQP MACSTR
+			" cell_conn_pref=%u", MAC2STR(sa), *pos);
+		break;
+	default:
+		wpa_printf(MSG_DEBUG, "MBO: Unsupported ANQP subtype %u",
+			   subtype);
+		break;
+	}
+}

wpa_supplicant/wpa_supplicant_i.h

@@ -1295,6 +1295,9 @@ size_t wpas_mbo_ie_bss_trans_reject(struct wpa_supplicant *wpa_s, u8 *pos,
 void wpas_mbo_update_cell_capa(struct wpa_supplicant *wpa_s, u8 mbo_cell_capa);
 struct wpabuf * mbo_build_anqp_buf(struct wpa_supplicant *wpa_s,
 				   struct wpa_bss *bss, u32 mbo_subtypes);
+void mbo_parse_rx_anqp_resp(struct wpa_supplicant *wpa_s,
+			    struct wpa_bss *bss, const u8 *sa,
+			    const u8 *data, size_t slen);
 
 /* op_classes.c */
 enum chan_allowed {