Allow background scan period to be configured

A network block specific background scan period can now be configured
for drivers that implement internal background scan mechanism for
roaming and BSS selection.

Signed-hostap: Bala Shanmugam <bkamatch@qca.qualcomm.com>

src/drivers/driver.h

@@ -332,6 +332,13 @@ struct wpa_driver_associate_params {
 	 */
 	int freq;
 
+	/**
+	 * bg_scan_period - Background scan period in seconds, 0 to disable
+	 * background scan, or -1 to indicate no change to default driver
+	 * configuration
+	 */
+	int bg_scan_period;
+
 	/**
 	 * wpa_ie - WPA information element for (Re)Association Request
 	 * WPA information element to be included in (Re)Association

src/drivers/driver_nl80211.c

@@ -6575,6 +6575,12 @@ static int wpa_driver_nl80211_connect(
 		wpa_printf(MSG_DEBUG, "  * freq=%d", params->freq);
 		NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FREQ, params->freq);
 	}
+	if (params->bg_scan_period >= 0) {
+		wpa_printf(MSG_DEBUG, "  * bg scan period=%d",
+			   params->bg_scan_period);
+		NLA_PUT_U16(msg, NL80211_ATTR_BG_SCAN_PERIOD,
+			    params->bg_scan_period);
+	}
 	if (params->ssid) {
 		wpa_hexdump_ascii(MSG_DEBUG, "  * SSID",
 				  params->ssid, params->ssid_len);
@@ -6772,6 +6778,12 @@ static int wpa_driver_nl80211_associate(
 		drv->assoc_freq = params->freq;
 	} else
 		drv->assoc_freq = 0;
+	if (params->bg_scan_period >= 0) {
+		wpa_printf(MSG_DEBUG, "  * bg scan period=%d",
+			   params->bg_scan_period);
+		NLA_PUT_U16(msg, NL80211_ATTR_BG_SCAN_PERIOD,
+			    params->bg_scan_period);
+	}
 	if (params->ssid) {
 		wpa_hexdump_ascii(MSG_DEBUG, "  * SSID",
 				  params->ssid, params->ssid_len);

wpa_supplicant/config.c

@@ -1525,6 +1525,7 @@ static const struct parse_data ssid_fields[] = {
 	{ FUNC_KEY(psk) },
 	{ FUNC(proto) },
 	{ FUNC(key_mgmt) },
+	{ INT(bg_scan_period) },
 	{ FUNC(pairwise) },
 	{ FUNC(group) },
 	{ FUNC(auth_alg) },
@@ -1978,6 +1979,7 @@ void wpa_config_set_network_defaults(struct wpa_ssid *ssid)
 	ssid->pairwise_cipher = DEFAULT_PAIRWISE;
 	ssid->group_cipher = DEFAULT_GROUP;
 	ssid->key_mgmt = DEFAULT_KEY_MGMT;
+	ssid->bg_scan_period = DEFAULT_BG_SCAN_PERIOD;
 #ifdef IEEE8021X_EAPOL
 	ssid->eapol_flags = DEFAULT_EAPOL_FLAGS;
 	ssid->eap_workaround = DEFAULT_EAP_WORKAROUND;

wpa_supplicant/config_file.c

@@ -588,6 +588,7 @@ static void wpa_config_write_network(FILE *f, struct wpa_ssid *ssid)
 	write_psk(f, ssid);
 	write_proto(f, ssid);
 	write_key_mgmt(f, ssid);
+	INT(bg_scan_period);
 	write_pairwise(f, ssid);
 	write_group(f, ssid);
 	write_auth_alg(f, ssid);

wpa_supplicant/config_ssid.h

@@ -25,6 +25,7 @@
 		       WPA_CIPHER_WEP104 | WPA_CIPHER_WEP40)
 #define DEFAULT_FRAGMENT_SIZE 1398
 
+#define DEFAULT_BG_SCAN_PERIOD -1
 #define DEFAULT_DISABLE_HT 0
 #define DEFAULT_DISABLE_HT40 0
 #define DEFAULT_DISABLE_MAX_AMSDU -1 /* no change */
@@ -156,6 +157,12 @@ struct wpa_ssid {
 	 */
 	int key_mgmt;
 
+	/**
+	 * bg_scan_period - Background scan period in seconds, 0 to disable, or
+	 * -1 to indicate no change to default driver configuration
+	 */
+	int bg_scan_period;
+
 	/**
 	 * proto - Bitfield of allowed protocols, WPA_PROTO_*
 	 */

wpa_supplicant/sme.c

@@ -371,6 +371,8 @@ void sme_associate(struct wpa_supplicant *wpa_s, enum wpas_mode mode,
 	params.ssid = wpa_s->sme.ssid;
 	params.ssid_len = wpa_s->sme.ssid_len;
 	params.freq = wpa_s->sme.freq;
+	params.bg_scan_period = wpa_s->current_ssid ?
+		wpa_s->current_ssid->bg_scan_period : -1;
 	params.wpa_ie = wpa_s->sme.assoc_req_ie_len ?
 		wpa_s->sme.assoc_req_ie : NULL;
 	params.wpa_ie_len = wpa_s->sme.assoc_req_ie_len;

wpa_supplicant/wpa_supplicant.c

@@ -1355,6 +1355,7 @@ void wpa_supplicant_associate(struct wpa_supplicant *wpa_s,
 	params.wpa_proto = wpa_s->wpa_proto;
 	params.auth_alg = algs;
 	params.mode = ssid->mode;
+	params.bg_scan_period = ssid->bg_scan_period;
 	for (i = 0; i < NUM_WEP_KEYS; i++) {
 		if (ssid->wep_key_len[i])
 			params.wep_key[i] = ssid->wep_key[i];