ANQP: Add support to specify frequency in ANQP_GET command

Previously, wpa_supplicant fetched BSS channel info from scan results to
send ANQP Query frames. If the scan results for the specified BSS are
not available, the ANQP_GET command request was getting rejected.

Add support to send ANQP Query frame on the specified frequency without
requiring the scan results to be available.

The control interface command format:
- ANQP_GET <dst_addr> [freq=<freq in MHz>] <Query ID1>[,<Query ID2>,..]

Signed-off-by: Veerendranath Jakkam <vjakkam@codeaurora.org>

wpa_supplicant/ctrl_iface.c

@@ -7466,7 +7466,7 @@ static int ctrl_interworking_connect(struct wpa_supplicant *wpa_s, char *dst,
 static int get_anqp(struct wpa_supplicant *wpa_s, char *dst)
 {
 	u8 dst_addr[ETH_ALEN];
-	int used;
+	int used, freq = 0;
 	char *pos;
 #define MAX_ANQP_INFO_ID 100
 	u16 id[MAX_ANQP_INFO_ID];
@@ -7480,6 +7480,15 @@ static int get_anqp(struct wpa_supplicant *wpa_s, char *dst)
 	pos = dst + used;
 	if (*pos == ' ')
 		pos++;
+
+	if (os_strncmp(pos, "freq=", 5) == 0) {
+		freq = atoi(pos + 5);
+		pos = os_strchr(pos, ' ');
+		if (!pos)
+			return -1;
+		pos++;
+	}
+
 	while (num_id < MAX_ANQP_INFO_ID) {
 		if (os_strncmp(pos, "hs20:", 5) == 0) {
 #ifdef CONFIG_HS20
@@ -7514,7 +7523,7 @@ static int get_anqp(struct wpa_supplicant *wpa_s, char *dst)
 	if (num_id == 0 && !subtypes && !mbo_subtypes)
 		return -1;
 
-	return anqp_send_req(wpa_s, dst_addr, id, num_id, subtypes,
+	return anqp_send_req(wpa_s, dst_addr, freq, id, num_id, subtypes,
 			     mbo_subtypes);
 }
 

wpa_supplicant/interworking.c

@@ -2750,27 +2750,27 @@ void interworking_stop_fetch_anqp(struct wpa_supplicant *wpa_s)
 }
 
 
-int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
+int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst, int freq,
 		  u16 info_ids[], size_t num_ids, u32 subtypes,
 		  u32 mbo_subtypes)
 {
 	struct wpabuf *buf;
 	struct wpabuf *extra_buf = NULL;
 	int ret = 0;
-	int freq;
 	struct wpa_bss *bss;
 	int res;
 
 	bss = wpa_bss_get_bssid(wpa_s, dst);
-	if (!bss) {
+	if (!bss && !freq) {
 		wpa_printf(MSG_WARNING,
-			   "ANQP: Cannot send query to unknown BSS "
-			   MACSTR, MAC2STR(dst));
+			   "ANQP: Cannot send query without BSS freq info");
 		return -1;
 	}
 
-	wpa_bss_anqp_unshare_alloc(bss);
-	freq = bss->freq;
+	if (bss)
+		wpa_bss_anqp_unshare_alloc(bss);
+	if (bss && !freq)
+		freq = bss->freq;
 
 	wpa_msg(wpa_s, MSG_DEBUG,
 		"ANQP: Query Request to " MACSTR " for %u id(s)",
@@ -2789,6 +2789,13 @@ int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
 	if (mbo_subtypes) {
 		struct wpabuf *mbo;
 
+		if (!bss) {
+			wpa_printf(MSG_WARNING,
+				   "ANQP: Cannot send MBO query to unknown BSS "
+				   MACSTR, MAC2STR(dst));
+			return -1;
+		}
+
 		mbo = mbo_build_anqp_buf(wpa_s, bss, mbo_subtypes);
 		if (mbo) {
 			if (wpabuf_resize(&extra_buf, wpabuf_len(mbo))) {

wpa_supplicant/interworking.h

@@ -11,7 +11,7 @@
 
 enum gas_query_result;
 
-int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst,
+int anqp_send_req(struct wpa_supplicant *wpa_s, const u8 *dst, int freq,
 		  u16 info_ids[], size_t num_ids, u32 subtypes,
 		  u32 mbo_subtypes);
 void anqp_resp_cb(void *ctx, const u8 *dst, u8 dialog_token,