NAN USD: Add publishChannelList option for Subscriber

Add frequency list to active NAN USD Subscriber to search for a
Publisher on multiple channels. This is the publish channel list used by
the Subscriber to periodically search for a service on these channels.
publishChannelList was already supported in the Publisher and this
commit extends that to the Subscriber.

This is needed for a P2P2 seeker that is an active subscriber looking
for an advertiser on a list of publish channels.

Signed-off-by: Shivani Baranwal <quic_shivbara@quicinc.com>

src/common/nan_de.c

@@ -1358,6 +1358,17 @@ int nan_de_subscribe(struct nan_de *de, const char *service_name,
 	if (nan_de_derive_service_id(srv) < 0)
 		goto fail;
 	os_memcpy(&srv->subscribe, params, sizeof(*params));
+
+	if (params->freq_list) {
+		size_t len;
+
+		len = (int_array_len(params->freq_list) + 1) * sizeof(int);
+		srv->freq_list = os_memdup(params->freq_list, len);
+		if (!srv->freq_list)
+			goto fail;
+	}
+	srv->subscribe.freq_list = NULL;
+
 	srv->srv_proto_type = srv_proto_type;
 	if (ssi) {
 		srv->ssi = wpabuf_dup(ssi);

src/common/nan_de.h

@@ -125,6 +125,9 @@ struct nan_subscribe_params {
 	/* Selected frequency */
 	unsigned int freq;
 
+	/* Multi-channel frequencies (publishChannelList) */
+	const int *freq_list;
+
 	/* Query period in ms; 0 = use default */
 	unsigned int query_period;
 };

wpa_supplicant/ctrl_iface.c

@@ -12373,6 +12373,7 @@ static int wpas_ctrl_nan_subscribe(struct wpa_supplicant *wpa_s, char *cmd,
 	struct wpabuf *ssi = NULL;
 	int ret = -1;
 	enum nan_service_protocol_type srv_proto_type = 0;
+	int *freq_list = NULL;
 	bool p2p = false;
 
 	os_memset(&params, 0, sizeof(params));
@@ -12399,6 +12400,27 @@ static int wpas_ctrl_nan_subscribe(struct wpa_supplicant *wpa_s, char *cmd,
 			continue;
 		}
 
+		if (os_strncmp(token, "freq_list=", 10) == 0) {
+			char *pos = token + 10;
+
+			if (os_strcmp(pos, "all") == 0) {
+				os_free(freq_list);
+				freq_list = wpas_nan_usd_all_freqs(wpa_s);
+				params.freq_list = freq_list;
+				continue;
+			}
+
+			while (pos && pos[0]) {
+				int_array_add_unique(&freq_list, atoi(pos));
+				pos = os_strchr(pos, ',');
+				if (pos)
+					pos++;
+			}
+
+			params.freq_list = freq_list;
+			continue;
+		}
+
 		if (os_strncmp(token, "srv_proto_type=", 15) == 0) {
 			srv_proto_type = atoi(token + 15);
 			continue;
@@ -12431,6 +12453,7 @@ static int wpas_ctrl_nan_subscribe(struct wpa_supplicant *wpa_s, char *cmd,
 		ret = os_snprintf(buf, buflen, "%d", subscribe_id);
 fail:
 	wpabuf_free(ssi);
+	os_free(freq_list);
 	return ret;
 }