HS 2.0R2: Allow excluded network to be selected based on user override

Move excluded SSID filtering step to the end of credential validation
process and return list of BSSes that would otherwise have matching
credentials, but have an excluded SSID. Automatic network selection will
not select such a network, but interworking_connect command can be used
to pick excluded networks.

Signed-hostap: Jouni Malinen <jouni@qca.qualcomm.com>

src/common/wpa_ctrl.h

@@ -159,6 +159,7 @@ extern "C" {
 #define P2P_EVENT_REMOVE_AND_REFORM_GROUP "P2P-REMOVE-AND-REFORM-GROUP "
 
 #define INTERWORKING_AP "INTERWORKING-AP "
+#define INTERWORKING_BLACKLISTED "INTERWORKING-BLACKLISTED "
 #define INTERWORKING_NO_MATCH "INTERWORKING-NO-MATCH "
 #define INTERWORKING_ALREADY_CONNECTED "INTERWORKING-ALREADY-CONNECTED "
 

wpa_supplicant/interworking.c

@@ -46,9 +46,11 @@
 
 static void interworking_next_anqp_fetch(struct wpa_supplicant *wpa_s);
 static struct wpa_cred * interworking_credentials_available_realm(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw);
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
+	int *excluded);
 static struct wpa_cred * interworking_credentials_available_3gpp(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw);
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
+	int *excluded);
 
 
 static void interworking_reconnect(struct wpa_supplicant *wpa_s)
@@ -1238,10 +1240,12 @@ static int cred_conn_capab_missing(struct wpa_supplicant *wpa_s,
 
 
 static struct wpa_cred * interworking_credentials_available_roaming_consortium(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw)
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
+	int *excluded)
 {
 	struct wpa_cred *cred, *selected = NULL;
 	const u8 *ie;
+	int is_excluded = 0;
 
 	ie = wpa_bss_get_ie(bss, WLAN_EID_ROAMING_CONSORTIUM);
 
@@ -1264,8 +1268,6 @@ static struct wpa_cred * interworking_credentials_available_roaming_consortium(
 					      cred->roaming_consortium_len))
 			continue;
 
-		if (cred_excluded_ssid(cred, bss))
-			continue;
 		if (cred_no_required_oi_match(cred, bss))
 			continue;
 		if (!ignore_bw && cred_below_min_backhaul(wpa_s, cred, bss))
@@ -1274,12 +1276,25 @@ static struct wpa_cred * interworking_credentials_available_roaming_consortium(
 			continue;
 		if (!ignore_bw && cred_conn_capab_missing(wpa_s, cred, bss))
 			continue;
-
-		if (selected == NULL ||
-		    selected->priority < cred->priority)
-			selected = cred;
+		if (cred_excluded_ssid(cred, bss)) {
+			if (excluded == NULL)
+				continue;
+			if (selected == NULL) {
+				selected = cred;
+				is_excluded = 1;
+			}
+		} else {
+			if (selected == NULL || is_excluded ||
+			    selected->priority < cred->priority) {
+				selected = cred;
+				is_excluded = 0;
+			}
+		}
 	}
 
+	if (excluded)
+		*excluded = is_excluded;
+
 	return selected;
 }
 
@@ -1451,7 +1466,8 @@ fail:
 }
 
 
-int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+static int interworking_connect_helper(struct wpa_supplicant *wpa_s,
+				       struct wpa_bss *bss, int allow_excluded)
 {
 	struct wpa_cred *cred, *cred_rc, *cred_3gpp;
 	struct wpa_ssid *ssid;
@@ -1459,6 +1475,7 @@ int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 	struct nai_realm_eap *eap = NULL;
 	u16 count, i;
 	char buf[100];
+	int excluded = 0, *excl = allow_excluded ? &excluded : NULL;
 
 	if (wpa_s->conf->cred == NULL || bss == NULL)
 		return -1;
@@ -1479,50 +1496,64 @@ int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
 		return -1;
 	}
 
-	cred_rc = interworking_credentials_available_roaming_consortium(wpa_s,
-									bss, 0);
+	cred_rc = interworking_credentials_available_roaming_consortium(
+		wpa_s, bss, 0, excl);
 	if (cred_rc) {
 		wpa_printf(MSG_DEBUG, "Interworking: Highest roaming "
 			   "consortium matching credential priority %d",
 			   cred_rc->priority);
+		if (allow_excluded && excl && !(*excl))
+			excl = NULL;
 	}
 
-	cred = interworking_credentials_available_realm(wpa_s, bss, 0);
+	cred = interworking_credentials_available_realm(wpa_s, bss, 0, excl);
 	if (cred) {
 		wpa_printf(MSG_DEBUG, "Interworking: Highest NAI Realm list "
 			   "matching credential priority %d",
 			   cred->priority);
+		if (allow_excluded && excl && !(*excl))
+			excl = NULL;
 	}
 
-	cred_3gpp = interworking_credentials_available_3gpp(wpa_s, bss, 0);
+	cred_3gpp = interworking_credentials_available_3gpp(wpa_s, bss, 0,
+							    excl);
 	if (cred_3gpp) {
 		wpa_printf(MSG_DEBUG, "Interworking: Highest 3GPP matching "
 			   "credential priority %d", cred_3gpp->priority);
+		if (allow_excluded && excl && !(*excl))
+			excl = NULL;
 	}
 
 	if (!cred_rc && !cred && !cred_3gpp) {
 		cred_rc = interworking_credentials_available_roaming_consortium(
-			wpa_s, bss, 1);
+			wpa_s, bss, 1, excl);
 		if (cred_rc) {
 			wpa_printf(MSG_DEBUG, "Interworking: Highest roaming "
 				   "consortium matching credential priority %d "
 				   "(ignore BW)",
 				   cred_rc->priority);
+			if (allow_excluded && excl && !(*excl))
+				excl = NULL;
 		}
 
-		cred = interworking_credentials_available_realm(wpa_s, bss, 1);
+		cred = interworking_credentials_available_realm(wpa_s, bss, 1,
+								excl);
 		if (cred) {
 			wpa_printf(MSG_DEBUG, "Interworking: Highest NAI Realm "
 				   "list matching credential priority %d "
 				   "(ignore BW)", cred->priority);
+			if (allow_excluded && excl && !(*excl))
+				excl = NULL;
 		}
 
 		cred_3gpp = interworking_credentials_available_3gpp(wpa_s, bss,
-								    1);
+								    1, excl);
 		if (cred_3gpp) {
 			wpa_printf(MSG_DEBUG, "Interworking: Highest 3GPP "
 				   "matching credential priority %d (ignore BW)",
 				   cred_3gpp->priority);
+			if (allow_excluded && excl && !(*excl))
+				excl = NULL;
 		}
 	}
 
@@ -1681,13 +1712,21 @@ fail:
 }
 
 
+int interworking_connect(struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+{
+	return interworking_connect_helper(wpa_s, bss, 1);
+}
+
+
 static struct wpa_cred * interworking_credentials_available_3gpp(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw)
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
+	int *excluded)
 {
 	struct wpa_cred *selected = NULL;
 #ifdef INTERWORKING_3GPP
 	struct wpa_cred *cred;
 	int ret;
+	int is_excluded = 0;
 
 	if (bss->anqp == NULL || bss->anqp->anqp_3gpp == NULL)
 		return NULL;
@@ -1759,8 +1798,6 @@ static struct wpa_cred * interworking_credentials_available_3gpp(
 		ret = plmn_id_match(bss->anqp->anqp_3gpp, imsi, mnc_len);
 		wpa_printf(MSG_DEBUG, "PLMN match %sfound", ret ? "" : "not ");
 		if (ret) {
-			if (cred_excluded_ssid(cred, bss))
-				continue;
 			if (cred_no_required_oi_match(cred, bss))
 				continue;
 			if (!ignore_bw &&
@@ -1772,22 +1809,38 @@ static struct wpa_cred * interworking_credentials_available_3gpp(
 			if (!ignore_bw &&
 			    cred_conn_capab_missing(wpa_s, cred, bss))
 				continue;
-			if (selected == NULL ||
-			    selected->priority < cred->priority)
-				selected = cred;
+			if (cred_excluded_ssid(cred, bss)) {
+				if (excluded == NULL)
+					continue;
+				if (selected == NULL) {
+					selected = cred;
+					is_excluded = 1;
+				}
+			} else {
+				if (selected == NULL || is_excluded ||
+				    selected->priority < cred->priority) {
+					selected = cred;
+					is_excluded = 0;
+				}
+			}
 		}
 	}
+
+	if (excluded)
+		*excluded = is_excluded;
 #endif /* INTERWORKING_3GPP */
 	return selected;
 }
 
 
 static struct wpa_cred * interworking_credentials_available_realm(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw)
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
+	int *excluded)
 {
 	struct wpa_cred *cred, *selected = NULL;
 	struct nai_realm *realm;
 	u16 count, i;
+	int is_excluded = 0;
 
 	if (bss->anqp == NULL || bss->anqp->nai_realm == NULL)
 		return NULL;
@@ -1812,8 +1865,6 @@ static struct wpa_cred * interworking_credentials_available_realm(
 			if (!nai_realm_match(&realm[i], cred->realm))
 				continue;
 			if (nai_realm_find_eap(cred, &realm[i])) {
-				if (cred_excluded_ssid(cred, bss))
-					continue;
 				if (cred_no_required_oi_match(cred, bss))
 					continue;
 				if (!ignore_bw &&
@@ -1825,9 +1876,21 @@ static struct wpa_cred * interworking_credentials_available_realm(
 				if (!ignore_bw &&
 				    cred_conn_capab_missing(wpa_s, cred, bss))
 					continue;
-				if (selected == NULL ||
-				    selected->priority < cred->priority)
-					selected = cred;
+				if (cred_excluded_ssid(cred, bss)) {
+					if (excluded == NULL)
+						continue;
+					if (selected == NULL) {
+						selected = cred;
+						is_excluded = 1;
+					}
+				} else {
+					if (selected == NULL || is_excluded ||
+					    selected->priority <
+					    cred->priority) {
+						selected = cred;
+						is_excluded = 0;
+					}
+				}
 				break;
 			}
 		}
@@ -1835,14 +1898,19 @@ static struct wpa_cred * interworking_credentials_available_realm(
 
 	nai_realm_free(realm, count);
 
+	if (excluded)
+		*excluded = is_excluded;
+
 	return selected;
 }
 
 
 static struct wpa_cred * interworking_credentials_available_helper(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw)
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int ignore_bw,
+	int *excluded)
 {
 	struct wpa_cred *cred, *cred2;
+	int excluded1, excluded2;
 
 	if (disallowed_bssid(wpa_s, bss->bssid) ||
 	    disallowed_ssid(wpa_s, bss->ssid, bss->ssid_len)) {
@@ -1851,34 +1919,51 @@ static struct wpa_cred * interworking_credentials_available_helper(
 		return NULL;
 	}
 
-	cred = interworking_credentials_available_realm(wpa_s, bss, ignore_bw);
-	cred2 = interworking_credentials_available_3gpp(wpa_s, bss, ignore_bw);
-	if (cred && cred2 && cred2->priority >= cred->priority)
+	cred = interworking_credentials_available_realm(wpa_s, bss, ignore_bw,
+							&excluded1);
+	cred2 = interworking_credentials_available_3gpp(wpa_s, bss, ignore_bw,
+							&excluded2);
+	if (cred && cred2 &&
+	    (cred2->priority >= cred->priority || (!excluded2 && excluded1))) {
 		cred = cred2;
-	if (!cred)
+		excluded1 = excluded2;
+	}
+	if (!cred) {
 		cred = cred2;
+		excluded1 = excluded2;
+	}
 
-	cred2 = interworking_credentials_available_roaming_consortium(wpa_s,
-								      bss,
-								      ignore_bw);
-	if (cred && cred2 && cred2->priority >= cred->priority)
+	cred2 = interworking_credentials_available_roaming_consortium(
+		wpa_s, bss, ignore_bw, &excluded2);
+	if (cred && cred2 &&
+	    (cred2->priority >= cred->priority || (!excluded2 && excluded1))) {
 		cred = cred2;
-	if (!cred)
+		excluded1 = excluded2;
+	}
+	if (!cred) {
 		cred = cred2;
+		excluded1 = excluded2;
+	}
 
+	if (excluded)
+		*excluded = excluded1;
 	return cred;
 }
 
 
 static struct wpa_cred * interworking_credentials_available(
-	struct wpa_supplicant *wpa_s, struct wpa_bss *bss)
+	struct wpa_supplicant *wpa_s, struct wpa_bss *bss, int *excluded)
 {
 	struct wpa_cred *cred;
 
-	cred = interworking_credentials_available_helper(wpa_s, bss, 0);
+	if (excluded)
+		*excluded = 0;
+	cred = interworking_credentials_available_helper(wpa_s, bss, 0,
+							 excluded);
 	if (cred)
 		return cred;
-	return interworking_credentials_available_helper(wpa_s, bss, 1);
+	return interworking_credentials_available_helper(wpa_s, bss, 1,
+							 excluded);
 }
 
 
@@ -2064,7 +2149,7 @@ static struct wpa_bss * pick_best_roaming_partner(struct wpa_supplicant *wpa_s,
 	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
 		if (bss == selected)
 			continue;
-		cred = interworking_credentials_available(wpa_s, bss);
+		cred = interworking_credentials_available(wpa_s, bss, NULL);
 		if (!cred)
 			continue;
 		if (!wpa_bss_get_ie(bss, WLAN_EID_RSN))
@@ -2094,7 +2179,9 @@ static void interworking_select_network(struct wpa_supplicant *wpa_s)
 	wpa_s->network_select = 0;
 
 	dl_list_for_each(bss, &wpa_s->bss, struct wpa_bss, list) {
-		cred = interworking_credentials_available(wpa_s, bss);
+		int excluded = 0;
+		cred = interworking_credentials_available(wpa_s, bss,
+							  &excluded);
 		if (!cred)
 			continue;
 		if (!wpa_bss_get_ie(bss, WLAN_EID_RSN)) {
@@ -2107,7 +2194,8 @@ static void interworking_select_network(struct wpa_supplicant *wpa_s)
 				   "RSN", MAC2STR(bss->bssid));
 			continue;
 		}
-		count++;
+		if (!excluded)
+			count++;
 		res = interworking_home_sp(wpa_s, bss->anqp ?
 					   bss->anqp->domain_name : NULL);
 		if (res > 0)
@@ -2116,8 +2204,8 @@ static void interworking_select_network(struct wpa_supplicant *wpa_s)
 			type = "roaming";
 		else
 			type = "unknown";
-		wpa_msg(wpa_s, MSG_INFO, INTERWORKING_AP MACSTR
-			" type=%s%s%s%s",
+		wpa_msg(wpa_s, MSG_INFO, "%s" MACSTR " type=%s%s%s%s",
+			excluded ? INTERWORKING_BLACKLISTED : INTERWORKING_AP,
 			MAC2STR(bss->bssid), type,
 			cred_below_min_backhaul(wpa_s, cred, bss) ?
 			" below_min_backhaul=1" : "",
@@ -2125,6 +2213,8 @@ static void interworking_select_network(struct wpa_supplicant *wpa_s)
 			" over_max_bss_load=1" : "",
 			cred_conn_capab_missing(wpa_s, cred, bss) ?
 			" conn_capab_missing=1" : "");
+		if (excluded)
+			continue;
 		if (wpa_s->auto_select ||
 		    (wpa_s->conf->auto_interworking &&
 		     wpa_s->auto_network_select)) {