Validating type parameter and including all types

api/src/main/java/com/cloud/network/Network.java

@@ -43,7 +43,21 @@
 public interface Network extends ControlledEntity, StateObject<Network.State>, InternalIdentity, Identity, Serializable, Displayable {
 
     enum GuestType {
-        Shared, Isolated, L2
+        Shared, Isolated, L2;
+
+        public static GuestType fromValue(String type) {
+            if (StringUtils.isBlank(type)) {
+                return null;
+            } else if (type.equalsIgnoreCase("Shared")) {
+                return Shared;
+            } else if (type.equalsIgnoreCase("Isolated")) {
+                return Isolated;
+            } else if (type.equalsIgnoreCase("L2")) {
+                return L2;
+            } else {
+                throw new InvalidParameterValueException("Unexpected Guest type : " + type);
+            }
+        }
     }
 
     enum PVlanType {

api/src/main/java/org/apache/cloudstack/api/command/user/network/ListNetworksCmd.java

@@ -36,6 +36,7 @@
 
 import com.cloud.network.Network;
 import com.cloud.utils.Pair;
+import com.google.common.base.Strings;
 
 @APICommand(name = "listNetworks", description = "Lists all available networks.", responseObject = NetworkResponse.class, responseView = ResponseView.Restricted, entityType = {Network.class},
         requestHasSensitiveInfo = false, responseHasSensitiveInfo = false)
@@ -52,7 +53,7 @@ public class ListNetworksCmd extends BaseListTaggedResourcesCmd implements UserC
     @Parameter(name = ApiConstants.ZONE_ID, type = CommandType.UUID, entityType = ZoneResponse.class, description = "the zone ID of the network")
     private Long zoneId;
 
-    @Parameter(name = ApiConstants.TYPE, type = CommandType.STRING, description = "the type of the network. Supported values are: isolated and shared")
+    @Parameter(name = ApiConstants.TYPE, type = CommandType.STRING, description = "the type of the network. Supported values are: isolated, l2, shared and all")
     private String guestIpType;
 
     @Parameter(name = ApiConstants.IS_SYSTEM, type = CommandType.BOOLEAN, description = "true if network is system, false otherwise")
@@ -101,7 +102,13 @@ public Long getZoneId() {
     }
 
     public String getGuestIpType() {
-        return guestIpType;
+        if (!Strings.isNullOrEmpty(guestIpType)) {
+            if (guestIpType.equalsIgnoreCase("all")) {
+                return null;
+            }
+            return Network.GuestType.fromValue(guestIpType).toString();
+        }
+        return null;
     }
 
     public Boolean getIsSystem() {