HS 2.0: Extend ANQP_GET to accept Hotspot 2.0 subtypes

This allows a single ANQP query to be used to fetch both IEEE 802.11
defined ANQP elements and Hotspot 2.0 vendor specific elements.

ANQP_GET <addr> <info id>[,<info id>]...
[,hs20:<subtype>][...,hs20:<subtype>]

For example:
ANQP_GET 00:11:22:33:44:55:66 258,268,hs20:3,hs20:4

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

wpa_supplicant/ctrl_iface.c

@@ -4945,15 +4945,27 @@ static int get_anqp(struct wpa_supplicant *wpa_s, char *dst)
 #define MAX_ANQP_INFO_ID 100
 	u16 id[MAX_ANQP_INFO_ID];
 	size_t num_id = 0;
+	u32 subtypes = 0;
 
 	used = hwaddr_aton2(dst, dst_addr);
 	if (used < 0)
 		return -1;
 	pos = dst + used;
 	while (num_id < MAX_ANQP_INFO_ID) {
-		id[num_id] = atoi(pos);
-		if (id[num_id])
-			num_id++;
+		if (os_strncmp(pos, "hs20:", 5) == 0) {
+#ifdef CONFIG_HS20
+			int num = atoi(pos + 5);
+			if (num <= 0 || num > 31)
+				return -1;
+			subtypes |= BIT(num);
+#else /* CONFIG_HS20 */
+			return -1;
+#endif /* CONFIG_HS20 */
+		} else {
+			id[num_id] = atoi(pos);
+			if (id[num_id])
+				num_id++;
+		}
 		pos = os_strchr(pos + 1, ',');
 		if (pos == NULL)
 			break;
@@ -4963,7 +4975,7 @@ static int get_anqp(struct wpa_supplicant *wpa_s, char *dst)
 	if (num_id == 0)
 		return -1;
 
-	return anqp_send_req(wpa_s, dst_addr, id, num_id);
+	return anqp_send_req(wpa_s, dst_addr, id, num_id, subtypes);
 }
 
 

wpa_supplicant/hs20_supplicant.c

@@ -121,15 +121,13 @@ int hs20_get_pps_mo_id(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid)
 }
 
 
-struct wpabuf * hs20_build_anqp_req(u32 stypes, const u8 *payload,
-				    size_t payload_len)
+void hs20_put_anqp_req(u32 stypes, const u8 *payload, size_t payload_len,
+		       struct wpabuf *buf)
 {
-	struct wpabuf *buf;
 	u8 *len_pos;
 
-	buf = gas_anqp_build_initial_req(0, 100 + payload_len);
 	if (buf == NULL)
-		return NULL;
+		return;
 
 	len_pos = gas_anqp_add_element(buf, ANQP_VENDOR_SPECIFIC);
 	wpabuf_put_be24(buf, OUI_WFA);
@@ -156,6 +154,19 @@ struct wpabuf * hs20_build_anqp_req(u32 stypes, const u8 *payload,
 	gas_anqp_set_element_len(buf, len_pos);
 
 	gas_anqp_set_len(buf);
+}
+
+
+struct wpabuf * hs20_build_anqp_req(u32 stypes, const u8 *payload,
+				    size_t payload_len)
+{
+	struct wpabuf *buf;
+
+	buf = gas_anqp_build_initial_req(0, 100 + payload_len);
+	if (buf == NULL)
+		return NULL;
+
+	hs20_put_anqp_req(stypes, payload, payload_len, buf);
 
 	return buf;
 }

wpa_supplicant/hs20_supplicant.h

@@ -14,6 +14,8 @@ int hs20_anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst, u32 stypes,
 		       const u8 *payload, size_t payload_len);
 struct wpabuf * hs20_build_anqp_req(u32 stypes, const u8 *payload,
 				    size_t payload_len);
+void hs20_put_anqp_req(u32 stypes, const u8 *payload, size_t payload_len,
+		       struct wpabuf *buf);
 void hs20_parse_rx_hs20_anqp_resp(struct wpa_supplicant *wpa_s,
 				  const u8 *sa, const u8 *data, size_t slen);
 int is_hs20_network(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid,

wpa_supplicant/interworking.c

@@ -2531,9 +2531,10 @@ void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
 
 
 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
-		  u16 info_ids[], size_t num_ids)
+		  u16 info_ids[], size_t num_ids, u32 subtypes)
 {
 	struct wpabuf *buf;
+	struct wpabuf *hs20_buf = NULL;
 	int ret = 0;
 	int freq;
 	struct wpa_bss *bss;
@@ -2551,7 +2552,17 @@ int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
 	wpa_printf(MSG_DEBUG, "ANQP: Query Request to " MACSTR " for %u id(s)",
 		   MAC2STR(dst), (unsigned int) num_ids);
 
-	buf = anqp_build_req(info_ids, num_ids, NULL);
+#ifdef CONFIG_HS20
+	if (subtypes != 0) {
+		hs20_buf = wpabuf_alloc(100);
+		if (hs20_buf == NULL)
+			return -1;
+		hs20_put_anqp_req(subtypes, NULL, 0, hs20_buf);
+	}
+#endif /* CONFIG_HS20 */
+
+	buf = anqp_build_req(info_ids, num_ids, hs20_buf);
+	wpabuf_free(hs20_buf);
 	if (buf == NULL)
 		return -1;
 

wpa_supplicant/interworking.h

@@ -12,7 +12,7 @@
 enum gas_query_result;
 
 int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
-		  u16 info_ids[], size_t num_ids);
+		  u16 info_ids[], size_t num_ids, u32 subtypes);
 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,
 		  enum gas_query_result result,
 		  const struct wpabuf *adv_proto,