VLAN: Avoid access to non-existing interfaces

Currently, hostapd_get_vlan_id_ifname() is used to determine if a given
vlan is valid *and* to actually determine the interface. This leads to
wpa_set_keys() sometimes setting the key on the wildcard interface name,
which does not make sense.

This patch therefore adds hostapd_vlan_id_valid() and makes
hostapd_get_vlan_id_ifname() not return a wildcard interface.

Signed-hostap: Michael Braun <michael-dev@fami-braun.de>

src/ap/ap_config.c

@@ -606,11 +606,23 @@ int hostapd_rate_found(int *list, int rate)
 }
 
 
-const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
+int hostapd_vlan_id_valid(struct hostapd_vlan *vlan, int vlan_id)
 {
 	struct hostapd_vlan *v = vlan;
 	while (v) {
 		if (v->vlan_id == vlan_id || v->vlan_id == VLAN_ID_WILDCARD)
+			return 1;
+		v = v->next;
+	}
+	return 0;
+}
+
+
+const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan, int vlan_id)
+{
+	struct hostapd_vlan *v = vlan;
+	while (v) {
+		if (v->vlan_id == vlan_id)
 			return v->ifname;
 		v = v->next;
 	}

src/ap/ap_config.h

@@ -547,6 +547,7 @@ int hostapd_wep_key_cmp(struct hostapd_wep_keys *a,
 const u8 * hostapd_get_psk(const struct hostapd_bss_config *conf,
 			   const u8 *addr, const u8 *prev_psk);
 int hostapd_setup_wpa_psk(struct hostapd_bss_config *conf);
+int hostapd_vlan_id_valid(struct hostapd_vlan *vlan, int vlan_id);
 const char * hostapd_get_vlan_id_ifname(struct hostapd_vlan *vlan,
 					int vlan_id);
 struct hostapd_radius_attr *

src/ap/ieee802_11.c

@@ -650,8 +650,7 @@ static void handle_auth(struct hostapd_data *hapd,
 	}
 
 	if (vlan_id > 0) {
-		if (hostapd_get_vlan_id_ifname(hapd->conf->vlan,
-					       vlan_id) == NULL) {
+		if (!hostapd_vlan_id_valid(hapd->conf->vlan, vlan_id)) {
 			hostapd_logger(hapd, sta->addr, HOSTAPD_MODULE_RADIUS,
 				       HOSTAPD_LEVEL_INFO, "Invalid VLAN ID "
 				       "%d received from RADIUS server",

src/ap/ieee802_1x.c

@@ -1438,8 +1438,7 @@ ieee802_1x_receive_auth(struct radius_msg *msg, struct radius_msg *req,
 			sta->vlan_id = radius_msg_get_vlanid(msg);
 		}
 		if (sta->vlan_id > 0 &&
-		    hostapd_get_vlan_id_ifname(hapd->conf->vlan,
-					       sta->vlan_id)) {
+		    hostapd_vlan_id_valid(hapd->conf->vlan, sta->vlan_id)) {
 			hostapd_logger(hapd, sta->addr,
 				       HOSTAPD_MODULE_RADIUS,
 				       HOSTAPD_LEVEL_INFO,