#!/usr/local/bin/php . 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. */ $pgtitle = array("Firewall", "NAT", "Edit"); require("guiconfig.inc"); if (!is_array($config['nat']['rule'])) { $config['nat']['rule'] = array(); } nat_rules_sort(); $a_nat = &$config['nat']['rule']; $id = $_GET['id']; if (isset($_POST['id'])) $id = $_POST['id']; if (isset($id) && $a_nat[$id]) { $pconfig['extaddr'] = $a_nat[$id]['external-address']; $pconfig['proto'] = $a_nat[$id]['protocol']; list($pconfig['beginport'],$pconfig['endport']) = explode("-", $a_nat[$id]['external-port']); $pconfig['localip'] = $a_nat[$id]['target']; $pconfig['localbeginport'] = $a_nat[$id]['local-port']; $pconfig['descr'] = $a_nat[$id]['descr']; $pconfig['interface'] = $a_nat[$id]['interface']; if (!$pconfig['interface']) $pconfig['interface'] = "wan"; } else { $pconfig['interface'] = "wan"; } if ($_POST) { if ($_POST['beginport_cust'] && !$_POST['beginport']) $_POST['beginport'] = $_POST['beginport_cust']; if ($_POST['endport_cust'] && !$_POST['endport']) $_POST['endport'] = $_POST['endport_cust']; if ($_POST['localbeginport_cust'] && !$_POST['localbeginport']) $_POST['localbeginport'] = $_POST['localbeginport_cust']; if (!$_POST['endport']) $_POST['endport'] = $_POST['beginport']; unset($input_errors); $pconfig = $_POST; /* input validation */ $reqdfields = explode(" ", "interface proto beginport localip localbeginport"); $reqdfieldsn = explode(",", "Interface,Protocol,Start port,NAT IP,Local port"); do_input_validation($_POST, $reqdfields, $reqdfieldsn, &$input_errors); if ($_POST['extaddr'] == 'wan' && $_POST['interface'] == 'wan') { $input_errors[] = "The interface must not be WAN if the External Address is set to WAN."; } if (($_POST['beginport'] && !is_port($_POST['beginport']))) { $input_errors[] = "The start port must be an integer between 1 and 65535."; } if (($_POST['endport'] && !is_port($_POST['endport']))) { $input_errors[] = "The end port must be an integer between 1 and 65535."; } if (($_POST['localbeginport'] && !is_port($_POST['localbeginport']))) { $input_errors[] = "The local port must be an integer between 1 and 65535."; } if (($_POST['localip'] && !is_ipaddroralias($_POST['localip']))) { $input_errors[] = "A valid NAT IP address or host alias must be specified."; } if ($_POST['beginport'] > $_POST['endport']) { /* swap */ $tmp = $_POST['endport']; $_POST['endport'] = $_POST['beginport']; $_POST['beginport'] = $tmp; } if (!$input_errors) { if (($_POST['endport'] - $_POST['beginport'] + $_POST['localbeginport']) > 65535) $input_errors[] = "The target port range must lie between 1 and 65535."; } /* check for overlaps */ foreach ($a_nat as $natent) { if (isset($id) && ($a_nat[$id]) && ($a_nat[$id] === $natent)) continue; if ($natent['interface'] != $_POST['interface']) continue; if ($natent['external-address'] != $_POST['extaddr']) continue; if (($natent['protocol'] != $_POST['proto']) && ($natent['protocol'] != "tcp/udp") && ($_POST['proto'] != "tcp/udp")) continue; list($begp,$endp) = explode("-", $natent['external-port']); if (!$endp) $endp = $begp; if (!( (($_POST['beginport'] < $begp) && ($_POST['endport'] < $begp)) || (($_POST['beginport'] > $endp) && ($_POST['endport'] > $endp)))) { $input_errors[] = "The external port range overlaps with an existing entry."; break; } } if (!$input_errors) { $natent = array(); if ($_POST['extaddr']) $natent['external-address'] = $_POST['extaddr']; $natent['protocol'] = $_POST['proto']; if ($_POST['beginport'] == $_POST['endport']) $natent['external-port'] = $_POST['beginport']; else $natent['external-port'] = $_POST['beginport'] . "-" . $_POST['endport']; $natent['target'] = $_POST['localip']; $natent['local-port'] = $_POST['localbeginport']; $natent['interface'] = $_POST['interface']; $natent['descr'] = $_POST['descr']; if (isset($id) && $a_nat[$id]) $a_nat[$id] = $natent; else $a_nat[] = $natent; touch($d_natconfdirty_path); if ($_POST['autoadd'] && ($_POST['extaddr'] != 'wan')) { /* auto-generate a matching firewall rule */ $filterent = array(); $filterent['interface'] = $_POST['interface']; $filterent['protocol'] = $_POST['proto']; $filterent['source']['any'] = ""; $filterent['destination']['address'] = $_POST['localip']; $dstpfrom = $_POST['localbeginport']; $dstpto = $dstpfrom + $_POST['endport'] - $_POST['beginport']; if ($dstpfrom == $dstpto) $filterent['destination']['port'] = $dstpfrom; else $filterent['destination']['port'] = $dstpfrom . "-" . $dstpto; $filterent['descr'] = "NAT " . $_POST['descr']; $config['filter']['rule'][] = $filterent; touch($d_filterconfdirty_path); } write_config(); header("Location: firewall_nat.php"); exit; } } ?>
Interface
Choose which interface this rule applies to.
Hint: in most cases, you'll want to use WAN here.
External address
If you want this rule to apply to another IP address than the IP address of the interface chosen above, select it here (you need to define IP addresses on the Server NAT page first).
Protocol
Choose which IP protocol this rule should match.
Hint: in most cases, you should specify TCP  here.
External port range
from:  
to:

Specify the port or port range on the firewall's external address for this mapping.
Hint: you can leave the 'to' field empty if you only want to map a single port
NAT IP
Enter the internal IP address of the server on which you want to map the ports.
e.g. 192.168.1.12
Local port
Specify the port on the machine with the IP address entered above. In case of a port range, specify the beginning port of the range (the end port will be calculated automatically).
Hint: this is usually identical to the 'from' port above
Description
You may enter a description here for your reference (not parsed).
  Auto-add a firewall rule to permit traffic through this NAT rule