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<?php

/*
 * Copyright (C) 2014-2015 Deciso B.V.
 * Copyright (C) 2005-2007 Scott Ullrich <sullrich@gmail.com>
 * Copyright (C) 2008 Shrew Soft Inc. <mgrooms@shrew.net>
 * Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>
 * 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.
 */

require_once("guiconfig.inc");
require_once("interfaces.inc");
require_once("filter.inc");
require_once("system.inc");

function get_mac_address($ip)
{
    $macs = [];

    exec(exec_safe('/usr/sbin/arp -an | grep %s | awk \'{ print $4 }\'', $ip), $macs);

    return !empty($macs[0]) ? $macs[0] : '';
}

function generate_new_duid($duid_type)
{
    $new_duid = '';
    switch ($duid_type) {
        case '1': //LLT
            $mac = get_mac_address(getenv('REMOTE_ADDR'));
            $ts = time() - 946684800;
            $hts = dechex($ts);
            $timestamp = sprintf("%s",$hts);
            $timestamp_array = str_split($timestamp,2);
            $timestamp = implode(":",$timestamp_array);
            $type = "\x00\x01\x00\x01";
            for ($count = 0; $count < strlen($type); ) {
                $new_duid .= bin2hex( $type[$count]);
                $count++;
                if ($count < strlen($type)) {
                    $new_duid .= ':';
                }
            }
            $new_duid = $new_duid.':'.$timestamp.':'.$mac;
            break;
        case '2': //LL - NO TIMESTAMP: Just 00:03:00:01: + Link layer address in canonical form, so says RFC.
            $mac = get_mac_address(getenv('REMOTE_ADDR'));
            $type = "\x00\x03\x00\x01";
            for ($count = 0; $count < strlen($type); ) {
                $new_duid .= bin2hex( $type[$count]);
                $count++;
                if ($count < strlen($type)) {
                    $new_duid .= ':';
                }
            }
            $new_duid = $new_duid.':'.$mac;
            break;
        case '3': //UUID
            $type = "\x00\x00\x00\x04".random_bytes(16);
            for ($count = 0; $count < strlen($type); ) {
                $new_duid .= bin2hex( $type[$count]);
                $count++;
                if ($count < strlen($type)) {
                    $new_duid .= ':';
                }
            }
            break;
        case '4': //EN - Using Opnsense PEN!!!
            $type = "\x00\x02\x00\x00\xD2\x6D".random_bytes(8);
            for ($count = 0; $count < strlen($type); ) {
                $new_duid .= bin2hex( $type[$count]);
                $count++;
                if ($count < strlen($type)) {
                    $new_duid .= ':';
                }
            }
            break;
        default:
            $new_duid = 'XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX';
            break;
    }

    return strtoupper($new_duid);
}

function format_duid($duid)
{
    $values = explode(':', strtoupper(str_replace('-', ':', $duid)));

    foreach ($values as &$value) {
        $value = str_pad($value, 2, '0', STR_PAD_LEFT);
    };

    return implode(':', $values);
}

function is_duid($duid)
{
    // Duid's can be any length. Just check the format is correct.
    $values = explode(":", $duid);

    // need to get the DUID type. There are four types, in the
    // first three the type number is in byte[2] in the fourth it's
    // in byte[4]. Offset is either 0 or 2 depending if it's the read #
    // from file duid or the user input.

    $valid_duid = false;

    $duid_length = count($values);
    $test1 = hexdec($values[1]);
    $test2 = hexdec($values[3]);
    if (($test1 == 1 && $test2 == 1 ) || ($test1 == 3 && $test2 == 1 ) || ($test1 == 0 && $test2 == 4 ) || ($test1 == 2)) {
        $valid_duid = true;
    }

    /* max DUID length is 128, but with the separators it could be up to 254 */
    if ($duid_length < 6 || $duid_length > 254) {
        $valid_duid = false;
    }

    if ($valid_duid == false) {
        return false;
    }

    for ($i = 0; $i < count($values); $i++) {
        if (ctype_xdigit($values[$i]) == false) {
            return false;
        }
        if (hexdec($values[$i]) < 0 || hexdec($values[$i]) > 255) {
            return false;
        }
    }

    return true;
}

/* read duid from disk or return blank DUID string */
function read_duid()
{
    $duid = dhcp6c_duid_read();

    if (!is_duid($duid)) {
        $duid = 'XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX:XX';
    }

    return $duid;
}

$duid = read_duid();

if ($_SERVER['REQUEST_METHOD'] === 'GET') {
    $pconfig = [];
    $pconfig['ipv6allow'] = isset($config['system']['ipv6allow']);
    $pconfig['disablechecksumoffloading'] = isset($config['system']['disablechecksumoffloading']);
    $pconfig['disablesegmentationoffloading'] = isset($config['system']['disablesegmentationoffloading']);
    $pconfig['disablelargereceiveoffloading'] = isset($config['system']['disablelargereceiveoffloading']);
    $pconfig['dhcp6_norelease'] = isset($config['system']['dhcp6_norelease']);
    $pconfig['dhcp6_debug'] = !isset($config['system']['dhcp6_debug']) ? '0' : $config['system']['dhcp6_debug'];
    $pconfig['ipv6duid'] = $config['system']['ipv6duid'];
    $pconfig['disablevlanhwfilter']  = !isset($config['system']['disablevlanhwfilter']) ? '0' : $config['system']['disablevlanhwfilter'];
    $pconfig['sharednet'] = isset($config['system']['sharednet']);
    $pconfig['ipv6_duid_llt_value'] = generate_new_duid('1');
    $pconfig['ipv6_duid_ll_value'] = generate_new_duid('2');
    $pconfig['ipv6_duid_uuid_value'] = generate_new_duid('3');
    $pconfig['ipv6_duid_en_value'] = generate_new_duid('4');
} elseif ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $input_errors = [];
    $pconfig = $_POST;

    if (!empty($pconfig['ipv6duid']) && !is_duid($pconfig['ipv6duid'])) {
        $input_errors[] = gettext('A valid DUID must be specified.');
    }

    if (!count($input_errors)) {
        if (!empty($pconfig['sharednet'])) {
            $config['system']['sharednet'] = true;
        } elseif (isset($config['system']['sharednet'])) {
            unset($config['system']['sharednet']);
        }

        if (!empty($pconfig['ipv6allow'])) {
            $config['system']['ipv6allow'] = true;
        } elseif (isset($config['system']['ipv6allow'])) {
            unset($config['system']['ipv6allow']);
        }

        if (!empty($pconfig['disablechecksumoffloading'])) {
            $config['system']['disablechecksumoffloading'] = true;
        } elseif (isset($config['system']['disablechecksumoffloading'])) {
            unset($config['system']['disablechecksumoffloading']);
        }

        if (!empty($pconfig['disablesegmentationoffloading'])) {
            $config['system']['disablesegmentationoffloading'] = true;
        } elseif (isset($config['system']['disablesegmentationoffloading'])) {
            unset($config['system']['disablesegmentationoffloading']);
        }

        if (!empty($pconfig['disablelargereceiveoffloading'])) {
            $config['system']['disablelargereceiveoffloading'] = true;
        } elseif (isset($config['system']['disablelargereceiveoffloading'])) {
            unset($config['system']['disablelargereceiveoffloading']);
        }

        if (!empty($pconfig['disablevlanhwfilter'])) {
            $config['system']['disablevlanhwfilter'] = $pconfig['disablevlanhwfilter'];
        } elseif (isset($config['system']['disablevlanhwfilter'])) {
            unset($config['system']['disablevlanhwfilter']);
        }

        if (!empty($pconfig['dhcp6_norelease'])) {
            $config['system']['dhcp6_norelease'] = $pconfig['dhcp6_norelease'];
        } elseif (isset($config['system']['dhcp6_norelease'])) {
            unset($config['system']['dhcp6_norelease']);
        }

        if (!empty($pconfig['dhcp6_debug'])) {
            $config['system']['dhcp6_debug'] = $pconfig['dhcp6_debug'];
        } elseif (isset($config['system']['dhcp6_debug'])) {
            unset($config['system']['dhcp6_debug']);
        }

        if (!empty($pconfig['ipv6duid'])) {
            $config['system']['ipv6duid'] = $pconfig['ipv6duid'] = format_duid($pconfig['ipv6duid']);
        } elseif (isset($config['system']['ipv6duid'])) {
            unset($config['system']['ipv6duid']);
            /* clear the file as this means auto-generate */
            dhcp6c_duid_clear();
        }

        $savemsg = get_std_save_message();

        write_config();
        interface_dhcpv6_configure('duidonly', null); /* XXX refactor */
        system_sysctl_configure();
        interfaces_hardware();
        /* XXX interfaces IPv6 mode is forced to disable maybe but we are not reconfiguring here */
        filter_configure();
    }
}

legacy_html_escape_form_data($pconfig);

include("head.inc");

?>

<script>
    $( document ).ready(function () {
        window_highlight_table_option();
    });
</script>

<body>
<?php include("fbegin.inc"); ?>
<section class="page-content-main">
  <div class="container-fluid">
    <div class="row">
<?php
    if (isset($input_errors) && count($input_errors)) {
        print_input_errors($input_errors);
    }
    if (isset($savemsg)) {
        print_info_box($savemsg);
    }
?>
    <section class="col-xs-12">
      <form method="post" name="iform" id="iform">
        <div class="content-box tab-content table-responsive __mb">
          <table class="table table-striped opnsense_standard_table_form">
              <tr>
                <td style="width:22%"><strong><?= gettext('Network Interfaces') ?></strong></td>
                <td style="width:78%; text-align:right">
                  <small><?=gettext("full help"); ?> </small>
                  <i class="fa fa-toggle-off text-danger"  style="cursor: pointer;" id="show_all_help_page"></i>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_disablechecksumoffloading" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Hardware CRC"); ?></td>
                <td>
                  <input name="disablechecksumoffloading" type="checkbox" id="disablechecksumoffloading" value="yes" <?= !empty($pconfig['disablechecksumoffloading']) ? "checked=\"checked\"" :"";?> />
                  <?=gettext("Disable hardware checksum offload"); ?>
                  <div class="hidden" data-for="help_for_disablechecksumoffloading">
                    <?=gettext("Checking this option will disable hardware checksum offloading. Checksum offloading is broken in some hardware, particularly some Realtek cards. Rarely, drivers may have problems with checksum offloading and some specific NICs."); ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_disablesegmentationoffloading" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Hardware TSO"); ?></td>
                <td>
                  <input name="disablesegmentationoffloading" type="checkbox" id="disablesegmentationoffloading" value="yes" <?= !empty($pconfig['disablesegmentationoffloading']) ? "checked=\"checked\"" :"";?>/>
                  <?=gettext("Disable hardware TCP segmentation offload"); ?>
                  <div class="hidden" data-for="help_for_disablesegmentationoffloading">
                    <?=gettext("Checking this option will disable hardware TCP segmentation offloading (TSO, TSO4, TSO6). This offloading is broken in some hardware drivers, and may impact performance with some specific NICs."); ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_disablelargereceiveoffloading" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("Hardware LRO"); ?></td>
                <td>
                  <input name="disablelargereceiveoffloading" type="checkbox" id="disablelargereceiveoffloading" value="yes" <?= !empty($pconfig['disablelargereceiveoffloading']) ? "checked=\"checked\"" :"";?>/>
                  <?=gettext("Disable hardware large receive offload"); ?>
                  <div class="hidden" data-for="help_for_disablelargereceiveoffloading">
                    <?=gettext("Checking this option will disable hardware large receive offloading (LRO). This offloading is broken in some hardware drivers, and may impact performance with some specific NICs."); ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_disablevlanhwfilter" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("VLAN Hardware Filtering"); ?></td>
                <td>
                  <select name="disablevlanhwfilter" class="selectpicker">
                      <option value="0" <?=$pconfig['disablevlanhwfilter'] == "0" ? "selected=\"selected\"" : "";?> >
                        <?=gettext("Enable VLAN Hardware Filtering");?>
                      </option>
                      <option value="1" <?=$pconfig['disablevlanhwfilter'] == "1" ? "selected=\"selected\"" : "";?> >
                        <?=gettext("Disable VLAN Hardware Filtering"); ?>
                      </option>
                      <option value="2" <?=$pconfig['disablevlanhwfilter'] == "2" ? "selected=\"selected\"" : "";?> >
                        <?=gettext("Leave default");?>
                      </option>
                  </select>
                  <div class="hidden" data-for="help_for_disablevlanhwfilter">
                    <?= gettext('Set usage of VLAN hardware filtering. This hardware acceleration may be broken in a particular device driver, or may impact performance.') ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_sharednet" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("ARP Handling"); ?></td>
                <td>
                  <input name="sharednet" type="checkbox" id="sharednet" value="yes" <?= !empty($pconfig['sharednet']) ? 'checked="checked"' : '' ?>/>
                  <?=gettext("Suppress ARP messages"); ?>
                  <div class="hidden" data-for="help_for_sharednet">
                    <?=gettext("This option will suppress ARP log messages when multiple interfaces reside on the same broadcast domain"); ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_ipv6allow" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?= gettext('Allow IPv6') ?></td>
                <td>
                  <input name="ipv6allow" id="ipv6allow" type="checkbox" value="yes" <?= !empty($pconfig['ipv6allow']) ? 'checked="checked"' : '' ?>/>
                  <?= gettext('Allow IPv6') ?>
                  <div class="hidden" data-for="help_for_ipv6allow">
                    <?= gettext('If unchecked, IPv6 interface configuration will be ignored and all forwarding traffic will be blocked. Use with care.') ?>
                  </div>
                </td>
              </tr>
            </table>
          </div>
          <div class="content-box tab-content table-responsive __mb">
            <table class="table table-striped opnsense_standard_table_form">
              <tr>
                <td style="width:22%"><strong><?= gettext('IPv6 DHCP') ?></strong></td>
                <td style="width:78%"></td>
              </tr>
              <tr>
                <td><a id="help_for_dhcp6_norelease" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?= gettext('Prevent release') ?></td>
                <td>
                  <input name="dhcp6_norelease" type="checkbox" id="dhcp6_norelease" value="yes" <?= !empty($pconfig['dhcp6_norelease']) ? 'checked="checked"' : '' ?> />
                  <div class="hidden" data-for="help_for_dhcp6_norelease">
                    <?= gettext('Do not send a release message on client exit to prevent the release of an allocated address or prefix on the server.') ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_dhcp6_debug" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?= gettext('Log level') ?></td>
                <td>
                  <select name="dhcp6_debug" size="3" class="selectpicker" data-style="btn-default" id="dhcp6_debug">
<?php foreach(['0' => gettext('Standard'), '1' => gettext('Info'), '2' => gettext('Debug')] as $dhcp6cdebuglevel => $dhcp6cdebugvalue): ?>
                    <option value="<?= html_safe($dhcp6cdebuglevel) ?>" <?= $pconfig['dhcp6_debug'] == $dhcp6cdebuglevel ? 'selected="selected"' : '' ?>>
                      <?= html_safe($dhcp6cdebugvalue) ?>
                    </option>
<?php endforeach ?>
                  </select>
                  <div class="hidden" data-for="help_for_dhcp6_debug">
                    <?= gettext('Modify log level for IPv6 clients. Info will give status, interface leases and addresses. Debug will give full diagnostics.') ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td><a id="help_for_persistent_duid" href="#" class="showhelp"><i class="fa fa-info-circle"></i></a> <?=gettext("DHCP Unique Identifier"); ?></td>
                <td>
                  <textarea name="ipv6duid" id="ipv6duid" rows="2" ><?=$pconfig['ipv6duid'];?></textarea>
                  <input name="ipv6_duid_llt_value" type="hidden" value="<?= html_safe($pconfig['ipv6_duid_llt_value']) ?>">
                  <input name="ipv6_duid_ll_value" type="hidden" value="<?= html_safe($pconfig['ipv6_duid_ll_value']) ?>">
                  <input name="ipv6_duid_uuid_value" type="hidden" value="<?= html_safe($pconfig['ipv6_duid_uuid_value']) ?>">
                  <input name="ipv6_duid_en_value" type="hidden" value="<?= html_safe($pconfig['ipv6_duid_en_value']) ?>">
                  <a onclick="$('#ipv6duid').val('<?= html_safe($duid) ?>');" href="#"><?= gettext('Insert the existing DUID') ?></a><br/>
                  <a onclick="$('#ipv6duid').val('<?= html_safe($pconfig['ipv6_duid_llt_value']) ?>');" href="#"><?= gettext('Insert a new LLT DUID') ?></a><br/>
                  <a onclick="$('#ipv6duid').val('<?= html_safe($pconfig['ipv6_duid_ll_value']) ?>');" href="#"><?= gettext('Insert a new LL DUID') ?></a><br/>
                  <a onclick="$('#ipv6duid').val('<?= html_safe($pconfig['ipv6_duid_uuid_value']) ?>');" href="#"><?= gettext('Insert a new UUID DUID') ?></a><br/>
                  <a onclick="$('#ipv6duid').val('<?= html_safe($pconfig['ipv6_duid_en_value']) ?>');" href="#"><?= gettext('Insert a new EN DUID') ?></a><br/>
                  <a onclick="$('#ipv6duid').val('');" href="#"><?= gettext('Clear the existing DUID') ?></a><br/>
                  <div class="hidden" data-for="help_for_persistent_duid">
                    <?= gettext('This field can be used to enter an explicit DUID for use by IPv6 DHCP clients.') ?><br/>
                    <?= gettext('The correct format for each DUID type is as follows, all entries to be in hex format "xx" separated by a colon.') ?><br/>
                    <?= gettext('LLT: 4 bytes "00:01:00:01" followed by 4 bytes Unix time e.g. "00:01:02:03", followed by 6 bytes of the MAC address.') ?><br/>
                    <?= gettext('LL: 4 bytes "00:03:00:01" followed by 6 bytes of the MAC address.') ?><br/>
                    <?= gettext('UUID: 4 bytes "00:00:00:04" followed by 8 bytes of a universally unique identifier.') ?><br/>
                    <?= gettext('EN: 2 bytes "00:02" followed by 4 bytes of the enterprise number e.g. "00:00:00:01", ' .
                            'followed by a variable length identifier of hex values up to 122 bytes in length.') ?>
                  </div>
                </td>
              </tr>
              <tr>
                <td>&nbsp;</td>
                <td><button name="submit" type="submit" class="btn btn-primary" value="yes"><?= gettext('Save') ?></button></td>
              </tr>
              <tr>
                <td colspan="2">
                  <?= gettext('This will take effect after you reboot the machine or reconfigure each interface.') ?>
                </td>
              </tr>
            </table>
          </div>
        </form>
      </section>
    </div>
  </div>
</section>
<?php

include("foot.inc");

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