+#
+# Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
+#
+# Author: Emilien Macchi <emilien.macchi@enovance.com>
+# Martin Magr <mmagr@redhat.com>
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+#
+# Advanced validation when using GRE
+#
+
+module Puppet::Parser::Functions
+ newfunction(:validate_tunnel_id_ranges) do |args|
+ value = args[0]
+ if not value.kind_of?(Array)
+ value = [value]
+ end
+
+ value.each do |range|
+ if m = /^(\d+):(\d+)$/.match(range)
+ first_id = Integer(m[1])
+ second_id = Integer(m[2])
+ if ((second_id - first_id) > 1000000)
+ raise Puppet::Error, "tunnel id ranges are to large."
+ end
+ if ((second_id - first_id) < 0 )
+ raise Puppet::Error, "tunnel id ranges are invalid."
+ end
+ elsif range
+ raise Puppet::Error, "tunnel id ranges are invalid."
+ end
+ end
+ end
+end