diff --git a/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php b/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php
new file mode 100644
index 000000000..b42751a4e
--- /dev/null
+++ b/src/opnsense/mvc/app/library/OPNsense/Firewall/FilterRule.php
@@ -0,0 +1,151 @@
+<?php
+
+/**
+ *    Copyright (C) 2016 Deciso B.V.
+ *
+ *    All rights reserved.
+ *
+ *    Redistribution and use in source and binary forms, with or without
+ *    modification, are permitted provided that the following conditions are met:
+ *
+ *    1. Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ *
+ *    2. Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *
+ *    THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ *    INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
+ *    AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ *    AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
+ *    OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ *    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ *    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ *    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ *    POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+namespace OPNsense\Firewall;
+
+/**
+ * Class FilterRule
+ * @package OPNsense\Firewall
+ */
+class FilterRule
+{
+    private $rule = array();
+    private $interfaceMapping = array();
+
+    private $procorder = array(
+        'disabled' => 'parseIsComment',
+        'type' => 'parseType',
+        'ipprotocol' => 'parsePlain',
+        'interface' => 'parseInterface'
+    );
+
+    /**
+     * output parsing
+     * @param string $value field value
+     * @return string
+     */
+    private function parseIsComment($value)
+    {
+        return !empty($value) ? "#" : "";
+    }
+
+    /**
+     * parse plain data
+     * @param string $value field value
+     * @return string
+     */
+    private function parsePlain($value)
+    {
+        return empty($value) ? "" : $value . " ";
+    }
+
+    /**
+     * parse type
+     * @param string $value field value
+     * @return string
+     */
+    private function parseType($value)
+    {
+        switch ($value) {
+            case 'reject':
+                $type = 'block return';
+                break;
+            default:
+                $type = $value;
+        }
+        return empty($type) ? "pass " : $type . " ";
+    }
+
+    /**
+     * parse interface (name to interface)
+     * @param string $value field value
+     * @return string
+     */
+    private function parseInterface($value)
+    {
+        if (empty($this->interfaceMapping[$value]['if'])) {
+            return "##{$value}##";
+        } else {
+            return $this->interfaceMapping[$value]['if']." ";
+        }
+    }
+
+    /**
+     * preprocess internal rule data to detail level of actual ruleset
+     * handles shortcuts, like inet46 and multiple interfaces
+     * @return array
+     */
+    private function fetchActualRules()
+    {
+        $result = array();
+        $interfaces = empty($this->rule['interface']) ? array(null) : explode(',', $this->rule['interface']);
+        foreach ($interfaces as $interface) {
+            if (isset($this->rule['ipprotocol']) && $this->rule['ipprotocol'] == 'inet46') {
+                foreach (array('inet', 'inet6') as $ipproto) {
+                    $tmp = $this->rule;
+                    $tmp['interface'] = $interface;
+                    $tmp['ipprotocol'] = $ipproto;
+                    $result[] = $tmp;
+                }
+            } else {
+                $tmp = $this->rule;
+                $tmp['interface'] = $interface;
+                $result[] = $this->rule;
+            }
+        }
+        return $result;
+    }
+
+    /**
+     * init FilterRule
+     * @param array $interfaceMapping internal interface mapping
+     * @param array $conf rule configuration
+     */
+    public function __construct(&$interfaceMapping, $conf)
+    {
+        $this->interfaceMapping = $interfaceMapping;
+        $this->rule = $conf;
+    }
+
+    /**
+     * output rule as string
+     * @return string ruleset
+     */
+    public function  __toString()
+    {
+        $ruleTxt = '';
+        foreach ($this->fetchActualRules() as $rule) {
+            foreach ($this->procorder as $tag => $handle) {
+                $ruleTxt .= $this->$handle(isset($rule[$tag]) ? $rule[$tag] : null);
+            }
+            $ruleTxt .= "\n";
+        }
+        return $ruleTxt;
+    }
+}
diff --git a/src/opnsense/mvc/app/library/OPNsense/Firewall/Plugin.php b/src/opnsense/mvc/app/library/OPNsense/Firewall/Plugin.php
index 31309b0bc..c130eb0c4 100644
--- a/src/opnsense/mvc/app/library/OPNsense/Firewall/Plugin.php
+++ b/src/opnsense/mvc/app/library/OPNsense/Firewall/Plugin.php
@@ -36,19 +36,32 @@ namespace OPNsense\Firewall;
 class Plugin
 {
     private $anchors = array();
+    private $filterRules = array();
+    private $interfaceMapping ;
 
     /**
      * init firewall plugin component
      */
     public function __construct()
     {
+        $this->interfaceMapping = array();
+    }
+
+    /**
+     * set interface mapping to USE
+     * @param array $mapping named array
+     */
+    public function setInterfaceMapping(&$mapping)
+    {
+        $this->interfaceMapping = $mapping;
     }
 
     /**
      * register anchor
-     * @param $name anchor name
-     * @param $type anchor type (fw for filter, other options are nat,rdr,binat)
-     * @param $priority sort order from low to high
+     * @param string $name anchor name
+     * @param string $type anchor type (fw for filter, other options are nat,rdr,binat)
+     * @param string $priority sort order from low to high
+     * @param string $placement placement head,tail
      * @return null
      */
     public function registerAnchor($name, $type="fw", $priority=0, $placement="tail")
@@ -60,8 +73,8 @@ class Plugin
 
     /**
      * fetch anchors as text (pf ruleset part)
-     * @param $types anchor types (fw for filter, other options are nat,rdr,binat. comma seperated)
-     * @param $priority sort order from low to high
+     * @param string $types anchor types (fw for filter, other options are nat,rdr,binat. comma seperated)
+     * @param string $placement placement head,tail
      * @return string
      */
     public function anchorToText($types="fw", $placement="tail")
@@ -77,4 +90,34 @@ class Plugin
         }
         return $result;
     }
+
+    /**
+     * register a filter rule
+     * @param int $prio priority
+     * @param array $conf configuration
+     */
+    public function registerFilterRule($prio, $conf)
+    {
+        $rule = new FilterRule($this->interfaceMapping, $conf);
+        if (empty($this->filterRules[$prio])) {
+            $this->filterRules[$prio] = array();
+        }
+        $this->filterRules[$prio][] = $rule;
+    }
+
+    /**
+     * filter rules to text
+     * @return string
+     */
+    public function outputFilterRules()
+    {
+        $output = "";
+        ksort($this->filterRules);
+        foreach ($this->filterRules as $prio => $ruleset) {
+            foreach ($ruleset as $rule) {
+                $output .= (string)$rule;
+            }
+        }
+        return $output;
+    }
 }