P2P: Fix PBC overlap detection

PBC overlap detection searches for another BSS with active PBC in the
BSS table. However, when a separate P2P interface is used, scan results
without P2P IE are not saved in the BSS table, so non-P2P BSS's with
active PBC will not be detected.

Fix this by iterating only the WPS AP array instead of the BSS table.
This is also more efficient since only WPS APs may have active PBC. This
also fixes hwsim test "grpform_pbc_overlap" when a dedicated P2P Device
is used.

Signed-off-by: Avraham Stern <avraham.stern@intel.com>

wpa_supplicant/wpa_supplicant_i.h

@@ -366,6 +366,8 @@ struct wps_ap_info {
 	} type;
 	unsigned int tries;
 	struct os_reltime last_attempt;
+	unsigned int pbc_active;
+	u8 uuid[WPS_UUID_LEN];
 };
 
 struct wpa_ssid_value {

wpa_supplicant/wps_supplicant.c

@@ -1717,10 +1717,10 @@ int wpas_wps_ssid_wildcard_ok(struct wpa_supplicant *wpa_s,
 int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 			      struct wpa_bss *selected, struct wpa_ssid *ssid)
 {
-	const u8 *sel_uuid, *uuid;
+	const u8 *sel_uuid;
 	struct wpabuf *wps_ie;
 	int ret = 0;
-	struct wpa_bss *bss;
+	size_t i;
 
 	if (!eap_is_wps_pbc_enrollee(&ssid->eap))
 		return 0;
@@ -1741,40 +1741,28 @@ int wpas_wps_scan_pbc_overlap(struct wpa_supplicant *wpa_s,
 		sel_uuid = NULL;
 	}
 
-	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
-		struct wpabuf *ie;
-		if (bss == selected)
-			continue;
-		ie = wpa_bss_get_vendor_ie_multi(bss, WPS_IE_VENDOR_TYPE);
-		if (!ie)
-			continue;
-		if (!wps_is_selected_pbc_registrar(ie)) {
-			wpabuf_free(ie);
+	for (i = 0; i < wpa_s->num_wps_ap; i++) {
+		struct wps_ap_info *ap = &wpa_s->wps_ap[i];
+
+		if (!ap->pbc_active ||
+		    os_memcmp(selected->bssid, ap->bssid, ETH_ALEN) == 0)
 			continue;
-		}
+
 		wpa_printf(MSG_DEBUG, "WPS: Another BSS in active PBC mode: "
-			   MACSTR, MAC2STR(bss->bssid));
-		uuid = wps_get_uuid_e(ie);
+			   MACSTR, MAC2STR(ap->bssid));
 		wpa_hexdump(MSG_DEBUG, "WPS: UUID of the other BSS",
-			    uuid, UUID_LEN);
-		if (os_memcmp(selected->bssid, bss->bssid, ETH_ALEN) == 0) {
-			wpabuf_free(ie);
-			continue;
-		}
-		if (sel_uuid == NULL || uuid == NULL ||
-		    os_memcmp(sel_uuid, uuid, UUID_LEN) != 0) {
+			    ap->uuid, UUID_LEN);
+		if (sel_uuid == NULL ||
+		    os_memcmp(sel_uuid, ap->uuid, UUID_LEN) != 0) {
 			ret = 1; /* PBC overlap */
 			wpa_msg(wpa_s, MSG_INFO, "WPS: PBC overlap detected: "
 				MACSTR " and " MACSTR,
 				MAC2STR(selected->bssid),
-				MAC2STR(bss->bssid));
-			wpabuf_free(ie);
+				MAC2STR(ap->bssid));
 			break;
 		}
 
 		/* TODO: verify that this is reasonable dual-band situation */
-
-		wpabuf_free(ie);
 	}
 
 	wpabuf_free(wps_ie);
@@ -2798,7 +2786,8 @@ static void wpas_wps_update_ap_info_bss(struct wpa_supplicant *wpa_s,
 	struct wpabuf *wps;
 	enum wps_ap_info_type type;
 	struct wps_ap_info *ap;
-	int r;
+	int r, pbc_active;
+	const u8 *uuid;
 
 	if (wpa_scan_get_vendor_ie(res, WPS_IE_VENDOR_TYPE) == NULL)
 		return;
@@ -2815,7 +2804,8 @@ static void wpas_wps_update_ap_info_bss(struct wpa_supplicant *wpa_s,
 	else
 		type = WPS_AP_NOT_SEL_REG;
 
-	wpabuf_free(wps);
+	uuid = wps_get_uuid_e(wps);
+	pbc_active = wps_is_selected_pbc_registrar(wps);
 
 	ap = wpas_wps_get_ap_info(wpa_s, res->bssid);
 	if (ap) {
@@ -2827,13 +2817,16 @@ static void wpas_wps_update_ap_info_bss(struct wpa_supplicant *wpa_s,
 			if (type != WPS_AP_NOT_SEL_REG)
 				wpa_blacklist_del(wpa_s, ap->bssid);
 		}
-		return;
+		ap->pbc_active = pbc_active;
+		if (uuid)
+			os_memcpy(ap->uuid, uuid, WPS_UUID_LEN);
+		goto out;
 	}
 
 	ap = os_realloc_array(wpa_s->wps_ap, wpa_s->num_wps_ap + 1,
 			      sizeof(struct wps_ap_info));
 	if (ap == NULL)
-		return;
+		goto out;
 
 	wpa_s->wps_ap = ap;
 	ap = &wpa_s->wps_ap[wpa_s->num_wps_ap];
@@ -2842,8 +2835,14 @@ static void wpas_wps_update_ap_info_bss(struct wpa_supplicant *wpa_s,
 	os_memset(ap, 0, sizeof(*ap));
 	os_memcpy(ap->bssid, res->bssid, ETH_ALEN);
 	ap->type = type;
+	ap->pbc_active = pbc_active;
+	if (uuid)
+		os_memcpy(ap->uuid, uuid, WPS_UUID_LEN);
 	wpa_printf(MSG_DEBUG, "WPS: AP " MACSTR " type %d added",
 		   MAC2STR(ap->bssid), ap->type);
+
+out:
+	wpabuf_free(wps);
 }