P2P: Allow requested device type to be specified with p2p_find

This allows filtering of P2P peers that reply to the device discovery
Probe Request frames.

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

wpa_supplicant/README-P2P

@@ -72,7 +72,8 @@ over the main control interface.
 Device Discovery
 
 p2p_find [timeout in seconds] [type=<social|progressive>] \
-	[dev_id=<addr>] [delay=<search delay in ms>]
+	[dev_id=<addr>] [dev_type=<device type>] \
+	[delay=<search delay in ms>]
 
 The default behavior is to run a single full scan in the beginning and
 then scan only social channels. type=social will scan only social
@@ -87,6 +88,10 @@ search for. The optional delay parameter can be used to request an extra
 delay to be used between search iterations (e.g., to free up radio
 resources for concurrent operations).
 
+The optional dev_type option can be used to specify a single device type
+(primary or secondary) to search for, e.g.,
+"p2p_find dev_type=1-0050F204-1".
+
 p2p_listen [timeout in seconds]
 
 Start Listen-only state (become discoverable without searching for

wpa_supplicant/ctrl_iface.c

@@ -3652,6 +3652,7 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 	unsigned int timeout = atoi(cmd);
 	enum p2p_discovery_type type = P2P_FIND_START_WITH_FULL;
 	u8 dev_id[ETH_ALEN], *_dev_id = NULL;
+	u8 dev_type[WPS_DEV_TYPE_LEN], *_dev_type = NULL;
 	char *pos;
 	unsigned int search_delay;
 
@@ -3668,6 +3669,14 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 		_dev_id = dev_id;
 	}
 
+	pos = os_strstr(cmd, "dev_type=");
+	if (pos) {
+		pos += 9;
+		if (wps_dev_type_str2bin(pos, dev_type) < 0)
+			return -1;
+		_dev_type = dev_type;
+	}
+
 	pos = os_strstr(cmd, "delay=");
 	if (pos) {
 		pos += 6;
@@ -3675,8 +3684,8 @@ static int p2p_ctrl_find(struct wpa_supplicant *wpa_s, char *cmd)
 	} else
 		search_delay = wpas_p2p_search_delay(wpa_s);
 
-	return wpas_p2p_find(wpa_s, timeout, type, 0, NULL, _dev_id,
-			     search_delay);
+	return wpas_p2p_find(wpa_s, timeout, type, _dev_type != NULL, _dev_type,
+			     _dev_id, search_delay);
 }