X-Git-Url: http://www.project-moonshot.org/gitweb/?p=mech_eap.git;a=blobdiff_plain;f=wpa_supplicant%2Fwnm_sta.c;h=7674825e691377217bf42e8465f66c5ec76af410;hp=3b45bf632fdbea8b29a941c53283733b52fb0742;hb=6013bbe04f138f7d5d750a3e1939732cbde0426a;hpb=1e74ae4de95f70718c1cc433ad1cb03e1a886c4e

diff --git a/wpa_supplicant/wnm_sta.c b/wpa_supplicant/wnm_sta.c
index 3b45bf6..7674825 100644
--- a/wpa_supplicant/wnm_sta.c
+++ b/wpa_supplicant/wnm_sta.c
@@ -24,6 +24,7 @@
 #define MAX_TFS_IE_LEN  1024
 #define WNM_MAX_NEIGHBOR_REPORT 10
 
+#define WNM_SCAN_RESULT_AGE 2 /* 2 seconds */
 
 /* get the TFS IE from driver */
 static int ieee80211_11_get_tfs_ie(struct wpa_supplicant *wpa_s, u8 *buf,
@@ -139,6 +140,8 @@ int ieee802_11_send_wnmsleep_req(struct wpa_supplicant *wpa_s,
 	if (res < 0)
 		wpa_printf(MSG_DEBUG, "Failed to send WNM-Sleep Request "
 			   "(action=%d, intval=%d)", action, intval);
+	else
+		wpa_s->wnmsleep_used = 1;
 
 	os_free(wnmsleep_ie);
 	os_free(wnmtfs_ie);
@@ -189,6 +192,12 @@ static void wnm_sleep_mode_exit_success(struct wpa_supplicant *wpa_s,
 	end = ptr + key_len_total;
 	wpa_hexdump_key(MSG_DEBUG, "WNM: Key Data", ptr, key_len_total);
 
+	if (key_len_total && !wpa_sm_pmf_enabled(wpa_s->wpa)) {
+		wpa_msg(wpa_s, MSG_INFO,
+			"WNM: Ignore Key Data in WNM-Sleep Mode Response - PMF not enabled");
+		return;
+	}
+
 	while (end - ptr > 1) {
 		if (2 + ptr[1] > end - ptr) {
 			wpa_printf(MSG_DEBUG, "WNM: Invalid Key Data element "
@@ -249,6 +258,12 @@ static void ieee802_11_rx_wnmsleep_resp(struct wpa_supplicant *wpa_s,
 	const u8 *tfsresp_ie_end = NULL;
 	size_t left;
 
+	if (!wpa_s->wnmsleep_used) {
+		wpa_printf(MSG_DEBUG,
+			   "WNM: Ignore WNM-Sleep Mode Response frame since WNM-Sleep Mode has not been used in this association");
+		return;
+	}
+
 	if (len < 3)
 		return;
 	key_len_total = WPA_GET_LE16(frm + 1);
@@ -415,6 +430,7 @@ static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
 {
 	struct wpa_bss *bss = wpa_s->current_bss;
 	const char *country = NULL;
+	int freq;
 
 	if (bss) {
 		const u8 *elem = wpa_bss_get_ie(bss, WLAN_EID_COUNTRY);
@@ -423,7 +439,21 @@ static int wnm_nei_get_chan(struct wpa_supplicant *wpa_s, u8 op_class, u8 chan)
 			country = (const char *) (elem + 2);
 	}
 
-	return ieee80211_chan_to_freq(country, op_class, chan);
+	freq = ieee80211_chan_to_freq(country, op_class, chan);
+	if (freq <= 0 && op_class == 0) {
+		/*
+		 * Some APs do not advertise correct operating class
+		 * information. Try to determine the most likely operating
+		 * frequency based on the channel number.
+		 */
+		if (chan >= 1 && chan <= 13)
+			freq = 2407 + chan * 5;
+		else if (chan == 14)
+			freq = 2484;
+		else if (chan >= 36 && chan <= 169)
+			freq = 5000 + chan * 5;
+	}
+	return freq;
 }
 
 
@@ -470,7 +500,7 @@ static void wnm_parse_neighbor_report(struct wpa_supplicant *wpa_s,
 
 
 static struct wpa_bss *
-compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
+compare_scan_neighbor_results(struct wpa_supplicant *wpa_s, os_time_t age_secs)
 {
 
 	u8 i;
@@ -478,7 +508,7 @@ compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
 	struct wpa_bss *target;
 
 	if (!bss)
-		return 0;
+		return NULL;
 
 	wpa_printf(MSG_DEBUG, "WNM: Current BSS " MACSTR " RSSI %d",
 		   MAC2STR(wpa_s->bssid), bss->level);
@@ -503,6 +533,19 @@ compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
 			continue;
 		}
 
+		if (age_secs) {
+			struct os_reltime now;
+
+			if (os_get_reltime(&now) == 0 &&
+			    os_reltime_expired(&now, &target->last_update,
+					       age_secs)) {
+				wpa_printf(MSG_DEBUG,
+					   "Candidate BSS is more than %ld seconds old",
+					   age_secs);
+				continue;
+			}
+		}
+
 		if (bss->ssid_len != target->ssid_len ||
 		    os_memcmp(bss->ssid, target->ssid, bss->ssid_len) != 0) {
 			/*
@@ -517,6 +560,25 @@ compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
 			continue;
 		}
 
+		if (wpa_s->current_ssid &&
+		    !wpa_scan_res_match(wpa_s, 0, target, wpa_s->current_ssid,
+					1)) {
+			wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
+				   " (pref %d) does not match the current network profile",
+				   MAC2STR(nei->bssid),
+				   nei->preference_present ? nei->preference :
+				   -1);
+			continue;
+		}
+
+		if (wpa_is_bss_tmp_disallowed(wpa_s, target->bssid)) {
+			wpa_printf(MSG_DEBUG,
+				   "MBO: Candidate BSS " MACSTR
+				   " retry delay is not over yet",
+				   MAC2STR(nei->bssid));
+			continue;
+		}
+
 		if (target->level < bss->level && target->level < -80) {
 			wpa_printf(MSG_DEBUG, "Candidate BSS " MACSTR
 				   " (pref %d) does not have sufficient signal level (%d)",
@@ -538,12 +600,190 @@ compare_scan_neighbor_results(struct wpa_supplicant *wpa_s)
 }
 
 
+static int wpa_bss_ies_eq(struct wpa_bss *a, struct wpa_bss *b, u8 eid)
+{
+	const u8 *ie_a, *ie_b;
+
+	if (!a || !b)
+		return 0;
+
+	ie_a = wpa_bss_get_ie(a, eid);
+	ie_b = wpa_bss_get_ie(b, eid);
+
+	if (!ie_a || !ie_b || ie_a[1] != ie_b[1])
+		return 0;
+
+	return os_memcmp(ie_a, ie_b, ie_a[1]) == 0;
+}
+
+
+static u32 wnm_get_bss_info(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+	u32 info = 0;
+
+	info |= NEI_REP_BSSID_INFO_AP_UNKNOWN_REACH;
+
+	/*
+	 * Leave the security and key scope bits unset to indicate that the
+	 * security information is not available.
+	 */
+
+	if (bss->caps & WLAN_CAPABILITY_SPECTRUM_MGMT)
+		info |= NEI_REP_BSSID_INFO_SPECTRUM_MGMT;
+	if (bss->caps & WLAN_CAPABILITY_QOS)
+		info |= NEI_REP_BSSID_INFO_QOS;
+	if (bss->caps & WLAN_CAPABILITY_APSD)
+		info |= NEI_REP_BSSID_INFO_APSD;
+	if (bss->caps & WLAN_CAPABILITY_RADIO_MEASUREMENT)
+		info |= NEI_REP_BSSID_INFO_RM;
+	if (bss->caps & WLAN_CAPABILITY_DELAYED_BLOCK_ACK)
+		info |= NEI_REP_BSSID_INFO_DELAYED_BA;
+	if (bss->caps & WLAN_CAPABILITY_IMM_BLOCK_ACK)
+		info |= NEI_REP_BSSID_INFO_IMM_BA;
+	if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_MOBILITY_DOMAIN))
+		info |= NEI_REP_BSSID_INFO_MOBILITY_DOMAIN;
+	if (wpa_bss_ies_eq(bss, wpa_s->current_bss, WLAN_EID_HT_CAP))
+		info |= NEI_REP_BSSID_INFO_HT;
+
+	return info;
+}
+
+
+static int wnm_add_nei_rep(u8 *buf, size_t len, const u8 *bssid, u32 bss_info,
+			   u8 op_class, u8 chan, u8 phy_type, u8 pref)
+{
+	u8 *pos = buf;
+
+	if (len < 18) {
+		wpa_printf(MSG_DEBUG,
+			   "WNM: Not enough room for Neighbor Report element");
+		return -1;
+	}
+
+	*pos++ = WLAN_EID_NEIGHBOR_REPORT;
+	/* length: 13 for basic neighbor report + 3 for preference subelement */
+	*pos++ = 16;
+	os_memcpy(pos, bssid, ETH_ALEN);
+	pos += ETH_ALEN;
+	WPA_PUT_LE32(pos, bss_info);
+	pos += 4;
+	*pos++ = op_class;
+	*pos++ = chan;
+	*pos++ = phy_type;
+	*pos++ = WNM_NEIGHBOR_BSS_TRANSITION_CANDIDATE;
+	*pos++ = 1;
+	*pos++ = pref;
+	return pos - buf;
+}
+
+
+static int wnm_nei_rep_add_bss(struct wpa_supplicant *wpa_s,
+			       struct wpa_bss *bss, u8 *buf, size_t len,
+			       u8 pref)
+{
+	const u8 *ie;
+	u8 op_class, chan;
+	int sec_chan = 0, vht = 0;
+	enum phy_type phy_type;
+	u32 info;
+	struct ieee80211_ht_operation *ht_oper = NULL;
+	struct ieee80211_vht_operation *vht_oper = NULL;
+
+	ie = wpa_bss_get_ie(bss, WLAN_EID_HT_OPERATION);
+	if (ie && ie[1] >= 2) {
+		ht_oper = (struct ieee80211_ht_operation *) (ie + 2);
+
+		if (ht_oper->ht_param & HT_INFO_HT_PARAM_SECONDARY_CHNL_ABOVE)
+			sec_chan = 1;
+		else if (ht_oper->ht_param &
+			 HT_INFO_HT_PARAM_SECONDARY_CHNL_BELOW)
+			sec_chan = -1;
+	}
+
+	ie = wpa_bss_get_ie(bss, WLAN_EID_VHT_OPERATION);
+	if (ie && ie[1] >= 1) {
+		vht_oper = (struct ieee80211_vht_operation *) (ie + 2);
+
+		if (vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80MHZ ||
+		    vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_160MHZ ||
+		    vht_oper->vht_op_info_chwidth == VHT_CHANWIDTH_80P80MHZ)
+			vht = vht_oper->vht_op_info_chwidth;
+	}
+
+	if (ieee80211_freq_to_channel_ext(bss->freq, sec_chan, vht, &op_class,
+					  &chan) == NUM_HOSTAPD_MODES) {
+		wpa_printf(MSG_DEBUG,
+			   "WNM: Cannot determine operating class and channel");
+		return -2;
+	}
+
+	phy_type = ieee80211_get_phy_type(bss->freq, (ht_oper != NULL),
+					  (vht_oper != NULL));
+	if (phy_type == PHY_TYPE_UNSPECIFIED) {
+		wpa_printf(MSG_DEBUG,
+			   "WNM: Cannot determine BSS phy type for Neighbor Report");
+		return -2;
+	}
+
+	info = wnm_get_bss_info(wpa_s, bss);
+
+	return wnm_add_nei_rep(buf, len, bss->bssid, info, op_class, chan,
+			       phy_type, pref);
+}
+
+
+static int wnm_add_cand_list(struct wpa_supplicant *wpa_s, u8 *buf, size_t len)
+{
+	u8 *pos = buf;
+	unsigned int i, pref = 255;
+	struct os_reltime now;
+	struct wpa_ssid *ssid = wpa_s->current_ssid;
+
+	if (!ssid)
+		return 0;
+
+	/*
+	 * TODO: Define when scan results are no longer valid for the candidate
+	 * list.
+	 */
+	os_get_reltime(&now);
+	if (os_reltime_expired(&now, &wpa_s->last_scan, 10))
+		return 0;
+
+	wpa_printf(MSG_DEBUG,
+		   "WNM: Add candidate list to BSS Transition Management Response frame");
+	for (i = 0; i < wpa_s->last_scan_res_used && pref; i++) {
+		struct wpa_bss *bss = wpa_s->last_scan_res[i];
+		int res;
+
+		if (wpa_scan_res_match(wpa_s, i, bss, ssid, 1)) {
+			res = wnm_nei_rep_add_bss(wpa_s, bss, pos, len, pref--);
+			if (res == -2)
+				continue; /* could not build entry for BSS */
+			if (res < 0)
+				break; /* no more room for candidates */
+			if (pref == 1)
+				break;
+
+			pos += res;
+			len -= res;
+		}
+	}
+
+	wpa_hexdump(MSG_DEBUG,
+		    "WNM: BSS Transition Management Response candidate list",
+		    buf, pos - buf);
+
+	return pos - buf;
+}
+
+
 static void wnm_send_bss_transition_mgmt_resp(
 	struct wpa_supplicant *wpa_s, u8 dialog_token,
 	enum bss_trans_mgmt_status_code status, u8 delay,
 	const u8 *target_bssid)
 {
-	u8 buf[1000], *pos;
+	u8 buf[2000], *pos;
 	struct ieee80211_mgmt *mgmt;
 	size_t len;
 	int res;
@@ -583,6 +823,17 @@ static void wnm_send_bss_transition_mgmt_resp(
 		pos += ETH_ALEN;
 	}
 
+	if (status == WNM_BSS_TM_ACCEPT)
+		pos += wnm_add_cand_list(wpa_s, pos, buf + sizeof(buf) - pos);
+
+#ifdef CONFIG_MBO
+	if (status != WNM_BSS_TM_ACCEPT) {
+		pos += wpas_mbo_ie_bss_trans_reject(
+			wpa_s, pos, buf + sizeof(buf) - pos,
+			MBO_TRANSITION_REJECT_REASON_UNSPECIFIED);
+	}
+#endif /* CONFIG_MBO */
+
 	len = pos - (u8 *) &mgmt->u.action.category;
 
 	res = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,
@@ -595,6 +846,41 @@ static void wnm_send_bss_transition_mgmt_resp(
 }
 
 
+static void wnm_bss_tm_connect(struct wpa_supplicant *wpa_s,
+			       struct wpa_bss *bss, struct wpa_ssid *ssid,
+			       int after_new_scan)
+{
+	wpa_dbg(wpa_s, MSG_DEBUG,
+		"WNM: Transition to BSS " MACSTR
+		" based on BSS Transition Management Request (old BSSID "
+		MACSTR " after_new_scan=%d)",
+		MAC2STR(bss->bssid), MAC2STR(wpa_s->bssid), after_new_scan);
+
+	/* Send the BSS Management Response - Accept */
+	if (wpa_s->wnm_reply) {
+		wpa_s->wnm_reply = 0;
+		wpa_printf(MSG_DEBUG,
+			   "WNM: Sending successful BSS Transition Management Response");
+		wnm_send_bss_transition_mgmt_resp(wpa_s,
+						  wpa_s->wnm_dialog_token,
+						  WNM_BSS_TM_ACCEPT,
+						  0, bss->bssid);
+	}
+
+	if (bss == wpa_s->current_bss) {
+		wpa_printf(MSG_DEBUG,
+			   "WNM: Already associated with the preferred candidate");
+		wnm_deallocate_memory(wpa_s);
+		return;
+	}
+
+	wpa_s->reassociate = 1;
+	wpa_printf(MSG_DEBUG, "WNM: Issuing connect");
+	wpa_supplicant_connect(wpa_s, bss, ssid);
+	wnm_deallocate_memory(wpa_s);
+}
+
+
 int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
 {
 	struct wpa_bss *bss;
@@ -604,6 +890,8 @@ int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
 	if (!wpa_s->wnm_neighbor_report_elements)
 		return 0;
 
+	wpa_dbg(wpa_s, MSG_DEBUG,
+		"WNM: Process scan results for BSS Transition Management");
 	if (os_reltime_before(&wpa_s->wnm_cand_valid_until,
 			      &wpa_s->scan_trigger_time)) {
 		wpa_printf(MSG_DEBUG, "WNM: Previously stored BSS transition candidate list is not valid anymore - drop it");
@@ -619,7 +907,7 @@ int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
 	}
 
 	/* Compare the Neighbor Report and scan results */
-	bss = compare_scan_neighbor_results(wpa_s);
+	bss = compare_scan_neighbor_results(wpa_s, 0);
 	if (!bss) {
 		wpa_printf(MSG_DEBUG, "WNM: No BSS transition candidate match found");
 		status = WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES;
@@ -627,25 +915,7 @@ int wnm_scan_process(struct wpa_supplicant *wpa_s, int reply_on_fail)
 	}
 
 	/* Associate to the network */
-	/* Send the BSS Management Response - Accept */
-	if (wpa_s->wnm_reply) {
-		wpa_s->wnm_reply = 0;
-		wnm_send_bss_transition_mgmt_resp(wpa_s,
-						  wpa_s->wnm_dialog_token,
-						  WNM_BSS_TM_ACCEPT,
-						  0, bss->bssid);
-	}
-
-	if (bss == wpa_s->current_bss) {
-		wpa_printf(MSG_DEBUG,
-			   "WNM: Already associated with the preferred candidate");
-		wnm_deallocate_memory(wpa_s);
-		return 1;
-	}
-
-	wpa_s->reassociate = 1;
-	wpa_supplicant_connect(wpa_s, bss, ssid);
-	wnm_deallocate_memory(wpa_s);
+	wnm_bss_tm_connect(wpa_s, bss, ssid, 1);
 	return 1;
 
 send_bss_resp_fail:
@@ -786,12 +1056,88 @@ static void wnm_set_scan_freqs(struct wpa_supplicant *wpa_s)
 }
 
 
+static int wnm_fetch_scan_results(struct wpa_supplicant *wpa_s)
+{
+	struct wpa_scan_results *scan_res;
+	struct wpa_bss *bss;
+	struct wpa_ssid *ssid = wpa_s->current_ssid;
+	u8 i, found = 0;
+	size_t j;
+
+	wpa_dbg(wpa_s, MSG_DEBUG,
+		"WNM: Fetch current scan results from the driver for checking transition candidates");
+	scan_res = wpa_drv_get_scan_results2(wpa_s);
+	if (!scan_res) {
+		wpa_dbg(wpa_s, MSG_DEBUG, "WNM: Failed to get scan results");
+		return 0;
+	}
+
+	if (scan_res->fetch_time.sec == 0)
+		os_get_reltime(&scan_res->fetch_time);
+
+	filter_scan_res(wpa_s, scan_res);
+
+	for (i = 0; i < wpa_s->wnm_num_neighbor_report; i++) {
+		struct neighbor_report *nei;
+
+		nei = &wpa_s->wnm_neighbor_report_elements[i];
+		if (nei->preference_present && nei->preference == 0)
+			continue;
+
+		for (j = 0; j < scan_res->num; j++) {
+			struct wpa_scan_res *res;
+			const u8 *ssid_ie;
+
+			res = scan_res->res[j];
+			if (os_memcmp(nei->bssid, res->bssid, ETH_ALEN) != 0 ||
+			    res->age > WNM_SCAN_RESULT_AGE * 1000)
+				continue;
+			bss = wpa_s->current_bss;
+			ssid_ie = wpa_scan_get_ie(res, WLAN_EID_SSID);
+			if (bss && ssid_ie &&
+			    (bss->ssid_len != ssid_ie[1] ||
+			     os_memcmp(bss->ssid, ssid_ie + 2,
+				       bss->ssid_len) != 0))
+				continue;
+
+			/* Potential candidate found */
+			found = 1;
+			scan_snr(res);
+			scan_est_throughput(wpa_s, res);
+			wpa_bss_update_scan_res(wpa_s, res,
+						&scan_res->fetch_time);
+		}
+	}
+
+	wpa_scan_results_free(scan_res);
+	if (!found) {
+		wpa_dbg(wpa_s, MSG_DEBUG,
+			"WNM: No transition candidate matches existing scan results");
+		return 0;
+	}
+
+	bss = compare_scan_neighbor_results(wpa_s, WNM_SCAN_RESULT_AGE);
+	if (!bss) {
+		wpa_dbg(wpa_s, MSG_DEBUG,
+			"WNM: Comparison of scan results against transition candidates did not find matches");
+		return 0;
+	}
+
+	/* Associate to the network */
+	wnm_bss_tm_connect(wpa_s, bss, ssid, 0);
+	return 1;
+}
+
+
 static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 					     const u8 *pos, const u8 *end,
 					     int reply)
 {
 	unsigned int beacon_int;
 	u8 valid_int;
+#ifdef CONFIG_MBO
+	const u8 *vendor;
+#endif /* CONFIG_MBO */
 
 	if (end - pos < 5)
 		return;
@@ -852,6 +1198,12 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 		}
 	}
 
+#ifdef CONFIG_MBO
+	vendor = get_ie(pos, end - pos, WLAN_EID_VENDOR_SPECIFIC);
+	if (vendor)
+		wpas_mbo_ie_trans_req(wpa_s, vendor + 2, vendor[1]);
+#endif /* CONFIG_MBO */
+
 	if (wpa_s->wnm_mode & WNM_BSS_TM_REQ_PREF_CAND_LIST_INCLUDED) {
 		unsigned int valid_ms;
 
@@ -880,11 +1232,22 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 				rep = &wpa_s->wnm_neighbor_report_elements[
 					wpa_s->wnm_num_neighbor_report];
 				wnm_parse_neighbor_report(wpa_s, pos, len, rep);
+				wpa_s->wnm_num_neighbor_report++;
 			}
 
 			pos += len;
-			wpa_s->wnm_num_neighbor_report++;
 		}
+
+		if (!wpa_s->wnm_num_neighbor_report) {
+			wpa_printf(MSG_DEBUG,
+				   "WNM: Candidate list included bit is set, but no candidates found");
+			wnm_send_bss_transition_mgmt_resp(
+				wpa_s, wpa_s->wnm_dialog_token,
+				WNM_BSS_TM_REJECT_NO_SUITABLE_CANDIDATES,
+				0, NULL);
+			return;
+		}
+
 		wnm_sort_cand_list(wpa_s);
 		wnm_dump_cand_list(wpa_s);
 		valid_ms = valid_int * beacon_int * 128 / 125;
@@ -898,6 +1261,20 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 		wpa_s->wnm_cand_valid_until.usec %= 1000000;
 		os_memcpy(wpa_s->wnm_cand_from_bss, wpa_s->bssid, ETH_ALEN);
 
+		/*
+		 * Fetch the latest scan results from the kernel and check for
+		 * candidates based on those results first. This can help in
+		 * finding more up-to-date information should the driver has
+		 * done some internal scanning operations after the last scan
+		 * result update in wpa_supplicant.
+		 */
+		if (wnm_fetch_scan_results(wpa_s) > 0)
+			return;
+
+		/*
+		 * Try to use previously received scan results, if they are
+		 * recent enough to use for a connection.
+		 */
 		if (wpa_s->last_scan_res_used > 0) {
 			struct os_reltime now;
 
@@ -913,6 +1290,14 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 		}
 
 		wnm_set_scan_freqs(wpa_s);
+		if (wpa_s->wnm_num_neighbor_report == 1) {
+			os_memcpy(wpa_s->next_scan_bssid,
+				  wpa_s->wnm_neighbor_report_elements[0].bssid,
+				  ETH_ALEN);
+			wpa_printf(MSG_DEBUG,
+				   "WNM: Scan only for a specific BSSID since there is only a single candidate "
+				   MACSTR, MAC2STR(wpa_s->next_scan_bssid));
+		}
 		wpa_supplicant_req_scan(wpa_s, 0, 0);
 	} else if (reply) {
 		enum bss_trans_mgmt_status_code status;
@@ -930,16 +1315,17 @@ static void ieee802_11_rx_bss_trans_mgmt_req(struct wpa_supplicant *wpa_s,
 
 
 int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
-				       u8 query_reason)
+				       u8 query_reason, int cand_list)
 {
-	u8 buf[1000], *pos;
+	u8 buf[2000], *pos;
 	struct ieee80211_mgmt *mgmt;
 	size_t len;
 	int ret;
 
 	wpa_printf(MSG_DEBUG, "WNM: Send BSS Transition Management Query to "
-		   MACSTR " query_reason=%u",
-		   MAC2STR(wpa_s->bssid), query_reason);
+		   MACSTR " query_reason=%u%s",
+		   MAC2STR(wpa_s->bssid), query_reason,
+		   cand_list ? " candidate list" : "");
 
 	mgmt = (struct ieee80211_mgmt *) buf;
 	os_memset(&buf, 0, sizeof(buf));
@@ -954,6 +1340,9 @@ int wnm_send_bss_transition_mgmt_query(struct wpa_supplicant *wpa_s,
 	mgmt->u.action.u.bss_tm_query.query_reason = query_reason;
 	pos = mgmt->u.action.u.bss_tm_query.variable;
 
+	if (cand_list)
+		pos += wnm_add_cand_list(wpa_s, pos, buf + sizeof(buf) - pos);
+
 	len = pos - (u8 *) &mgmt->u.action.category;
 
 	ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0, wpa_s->bssid,