<?php

/*
    Copyright (C) 2004-2008 Scott Ullrich
    Copyright (C) 2008-2009 Ermal Luçi
    Copyright (C) 2005 Espen Johansen
    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 notices,
       this list of conditions and the following disclaimer.

    2. Redistributions in binary form must reproduce the above copyright
       notices, 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("interfaces.lib.inc");
require_once("gwlb.inc");

/*
 * converts a string like "a,b,c,d"
 * into an array like array("a" => "b", "c" => "d")
 */
function explode_assoc($delimiter, $string)
{
    $array = explode($delimiter, $string);
    $result = array();
    $numkeys = floor(count($array) / 2);
    for ($i = 0; $i < $numkeys; $i += 1) {
        $result[$array[$i * 2]] = $array[$i * 2 + 1];
    }
    return $result;
}


function return_hex_ipv4($ipv4)
{
    if (!is_ipaddrv4($ipv4)) {
        return false;
    }

    /* we need the hex form of the interface IPv4 address */
    $ip4arr = explode(".", $ipv4);
    return (sprintf("%02x%02x%02x%02x", $ip4arr[0], $ip4arr[1], $ip4arr[2], $ip4arr[3]));
}

function convert_ipv6_to_128bit($ipv6)
{
    if (!is_ipaddrv6($ipv6)) {
        return false;
    }

    $ip6arr = array();
    $ip6prefix = Net_IPv6::uncompress($ipv6);
    $ip6arr = explode(":", $ip6prefix);
    /* binary presentation of the prefix for all 128 bits. */
    $ip6prefixbin = "";
    foreach ($ip6arr as $element) {
        $ip6prefixbin .= sprintf("%016b", hexdec($element));
    }
    return $ip6prefixbin;
}

function convert_128bit_to_ipv6($ip6bin)
{
    if (strlen($ip6bin) <> 128) {
        return false;
    }

    $ip6arr = array();
    $ip6binarr = array();
    $ip6binarr = str_split($ip6bin, 16);
    foreach ($ip6binarr as $binpart) {
        $ip6arr[] = dechex(bindec($binpart));
    }
    $ip6addr = Net_IPv6::compress(implode(":", $ip6arr));

    return $ip6addr;
}

function match_wireless_interface($int)
{
    $wireless_regex = '/^(ndis|wi|ath|an|ral|ural|iwi|wlan|rum|run|bwn|zyd|mwl|bwi|ipw|iwn|malo|uath|upgt|urtw|wpi)/';
    return preg_match($wireless_regex, $int);
}

function interfaces_bring_up($interface)
{
    if (!$interface) {
        log_error('interfaces_bring_up() was called but no variable defined.');
        log_error('Backtrace: ' . debug_backtrace());
        return;
    }

    legacy_interface_flags($interface, 'up');
}

function does_interface_exist($interface)
{
    $ints = legacy_interface_listget();
    if (empty($interface) || $ints == null || !in_array($interface, $ints)) {
        return false;
    } else {
        return true;
    }
}

function interfaces_loopback_configure($verbose = false)
{
    if ($verbose) {
        echo 'Configuring loopback interface...';
        flush();
    }

    legacy_interface_setaddress('lo0', '127.0.0.1');
    legacy_interface_flags('lo0', 'up');

    if ($verbose) {
        echo "done.\n";
    }
}

function interfaces_vlan_priorities()
{
    $priorities = array();

    $priorities['1'] = gettext('Background (1, lowest)');
    $priorities['0'] = gettext('Best Effort (0, default)');
    $priorities['2'] = gettext('Excellent Effort (2)');
    $priorities['3'] = gettext('Critical Applications (3)');
    $priorities['4'] = gettext('Video (4)');
    $priorities['5'] = gettext('Voice (5)');
    $priorities['6'] = gettext('Internetwork Control (6)');
    $priorities['7'] = gettext('Network Control (7, highest)');

    return $priorities;
}

function interfaces_vlan_configure($realif = '', $verbose = false)
{
    global $config;

    if (!isset($config['vlans']['vlan'])) {
        return;
    }

    if ($verbose) {
        echo 'Configuring VLAN interfaces...';
        flush();
    }

    foreach ($config['vlans']['vlan'] as $vlan) {
        if (empty($vlan['vlanif'])) {
            $vlan['vlanif'] = "{$vlan['if']}_vlan{$vlan['tag']}";
        }
        if (!empty($realif) && $realif != $vlan['vlanif']) {
            continue;
        }
        interface_vlan_configure($vlan);
    }

    if ($verbose) {
        echo "done.\n";
    }
}

function interface_vlan_configure(&$vlan)
{
    global $config;

    if (!is_array($vlan)) {
        log_error('VLAN: called with wrong options. Problems with config!');
        return;
    }
    $if = $vlan['if'];
    $vlanif = empty($vlan['vlanif']) ? "{$if}_vlan{$vlan['tag']}" : $vlan['vlanif'];

    if (empty($if)) {
        log_error('interface_vlan_configure called with if undefined.');
        return;
    }

    interfaces_bring_up($if);

    $members = array($if);

    /* VLAN may be on top of another type of aggregation */
    if (isset($config['laggs']['lagg'])) {
        foreach ($config['laggs']['lagg'] as $lagg) {
            if ($if == $lagg['laggif']) {
                $members = explode(',', $lagg['members']);
                break;
            }
        }
    }

    // disable/enable hardware vlan tags, will be skipped when "Leave default" (option 2) is selected
    if (!isset($config['system']['disablevlanhwfilter']) || $config['system']['disablevlanhwfilter'] == 1) {
        foreach ($members as $member) {
            // set one tag at a time to avoid driver issues
            foreach (array('vlanmtu', 'vlanhwtag', 'vlanhwfilter', 'vlanhwcsum', 'vlanhwtso')  as $tag) {
                if (!isset($config['system']['disablevlanhwfilter'])) {
                    legacy_interface_flags($member, $tag);
                } else {
                    legacy_interface_flags($member, '-'.$tag);
                }
            }
        }
    }

    if (!empty($vlanif) && does_interface_exist($vlanif)) {
        interface_bring_down($vlanif, true);
    } else {
        $tmpvlanif = legacy_interface_create('vlan');
        legacy_interface_rename($tmpvlanif, $vlanif);
        mwexecf('/usr/sbin/ngctl name %s: %s', array($tmpvlanif, $vlanif));
    }

    $pcp = isset($vlan['pcp']) ? $vlan['pcp'] : 0;
    legacy_vlan_tag($vlanif, $if, $vlan['tag'], $pcp);

    interfaces_bring_up($vlanif);
    interfaces_bring_up($if);

    return $vlanif;
}

function interface_qinq_configure(&$vlan, $fd = null)
{
    global $config;

    if (!is_array($vlan)) {
        log_error(sprintf('QinQ compat VLAN: called with wrong options. Problems with config!'));
        return;
    }

    $qinqif = $vlan['if'];
    $tag = $vlan['tag'];
    if (empty($qinqif)) {
        log_error(sprintf('interface_qinq_configure called with if undefined.'));
        return;
    }

    if (!does_interface_exist($qinqif)) {
        log_error(sprintf('interface_qinq_configure called with invalid if.'));
        return;
    }

    $vlanif = interface_vlan_configure($vlan);

    if ($fd == null) {
        $exec = true;
        $fd = fopen('/tmp/netgraphcmd', 'w');
    } else {
        $exec = false;
    }

    /* make sure the parent is converted to ng_vlan(4) and is up */
    interfaces_bring_up($qinqif);

    if (!empty($vlanif) && does_interface_exist($vlanif)) {
        exec("/usr/sbin/ngctl msg {$vlanif}qinq: gettable", $result);
        if (empty($result)) {
            fwrite($fd, "mkpeer {$vlanif}: vlan lower downstream\n");
            fwrite($fd, "name {$vlanif}:lower {$vlanif}qinq\n");
            fwrite($fd, "connect {$vlanif}: {$vlanif}qinq: upper nomatch\n");
        }
    } else {
        fwrite($fd, "mkpeer {$vlanif}: vlan lower downstream\n");
        fwrite($fd, "name {$vlanif}:lower {$vlanif}qinq\n");
        fwrite($fd, "connect {$vlanif}: {$vlanif}qinq: upper nomatch\n");
    }

    if (!stristr($qinqif, "_vlan")) {
        mwexec("/sbin/ifconfig {$qinqif} promisc\n");
    }

    $macaddr = get_interface_mac($qinqif);
    if (!empty($vlan['members'])) {
        $members = explode(" ", $vlan['members']);
        foreach ($members as $qtag) {
            $qinq = array();
            $qinq['tag'] = $qtag;
            $qinq['if'] = $vlanif;
            interface_qinq2_configure($qinq, $fd, $macaddr);
        }
    }
    if ($exec) {
        fclose($fd);
        mwexec('/usr/sbin/ngctl -f /tmp/netgraphcmd');
    }

    interfaces_bring_up($qinqif);
    if (!empty($vlan['members'])) {
        $members = explode(" ", $vlan['members']);
        foreach ($members as $qif) {
            interfaces_bring_up("{$vlanif}_{$qif}");
        }
    }

    return $vlanif;
}

function interfaces_qinq_configure($verbose = false)
{
    global $config;

    if (!isset($config['qinqs']['qinqentry'])) {
        return;
    }

    if ($verbose) {
        echo 'Configuring QinQ interfaces...';
        flush();
    }

    foreach ($config['qinqs']['qinqentry'] as $qinq) {
        interface_qinq_configure($qinq);
    }

    if ($verbose) {
        echo "done.\n";
    }
}

function interface_qinq2_configure(&$qinq, $fd, $macaddr)
{
    global $config;

    if (!is_array($qinq)) {
        log_error(sprintf('QinQ compat VLAN: called with wrong options. Problems with config!'));
        return;
    }

    $if = $qinq['if'];
    $tag = $qinq['tag'];
    $vlanif = "{$if}_{$tag}";
    if (empty($if)) {
        log_error(sprintf('interface_qinq2_configure called with if undefined.'));
        return;
    }

    fwrite($fd, "mkpeer {$if}qinq: eiface {$if}{$tag} ether\n");
    fwrite($fd, "name {$if}qinq:{$if}{$tag} {$if}h{$tag}\n");
    fwrite($fd, "msg {$if}qinq: addfilter { vlan={$tag} hook=\"{$if}{$tag}\" }\n");
    fwrite($fd, "msg {$if}h{$tag}: setifname \"{$vlanif}\"\n");
    fwrite($fd, "msg {$if}h{$tag}: set {$macaddr}\n");

    return $vlanif;
}

function interfaces_test_wireless_capability($if, $cap)
{
    $caps = array('hostap' => 'HOSTAP', 'adhoc' => 'IBSS');

    if (!isset($caps[$cap])) {
        return false;
    }

    exec(sprintf('/sbin/ifconfig %s list caps', escapeshellarg($if)), $lines);

    foreach ($lines as $line) {
        if (preg_match("/^drivercaps=.*<.*{$caps[$cap]}.*>$/", $line)) {
            return true;
        }
    }

    return false;
}

function interfaces_create_wireless_clones($verbose = false)
{
    global $config;

    if ($verbose) {
        echo 'Creating wireless clone interfaces...';
        flush();
    }

    $iflist = get_configured_interface_list();

    foreach ($iflist as $if) {
        $realif = $config['interfaces'][$if]['if'];
        if (is_interface_wireless($realif)) {
            interface_wireless_clone(interface_get_wireless_clone($realif), $config['interfaces'][$if]);
        }
    }

    if (isset($config['wireless']['clone'])) {
        foreach ($config['wireless']['clone'] as $clone) {
            if (empty($clone['cloneif'])) {
                continue;
            }
            if (does_interface_exist($clone['cloneif'])) {
                continue;
            }
            interface_wireless_clone($clone['cloneif'], $clone);
        }
    }

    if ($verbose) {
        echo "done.\n";
    }
}

function interfaces_bridge_configure($checkmember = 0, $realif = '')
{
    global $config;

    $i = 0;
    if (isset($config['bridges']['bridged'])) {
        foreach ($config['bridges']['bridged'] as $bridge) {
            if (empty($bridge['bridgeif'])) {
                $bridge['bridgeif'] = "bridge{$i}";
            }
            if (!empty($realif) && $realif != $bridge['bridgeif']) {
                continue;
            }

            if ($checkmember == 1) {
                if (strstr($bridge['if'], "_vip")) {
                    continue;
                }
                $members = explode(',', $bridge['members']);
                foreach ($members as $member) {
                    if (!empty($config['interfaces'][$bridge['if']]) && $config['interfaces'][$bridge['if']]['ipaddrv6'] == "track6") {
                        continue 2;
                    }
                }
            } elseif ($checkmember == 2) {
                if (strstr($bridge['if'], "_vip")) {
                    continue;
                }
                $members = explode(',', $bridge['members']);
                foreach ($members as $member) {
                    if (empty($config['interfaces'][$bridge['if']]) || $config['interfaces'][$bridge['if']]['ipaddrv6'] != "track6") {
                        continue 2;
                    }
                }
            }
            /* XXX: Maybe we should report any errors?! */
            interface_bridge_configure($bridge, $checkmember);
            $i++;
        }
    }
}

function interface_bridge_configure(&$bridge, $checkmember = 0)
{
    global $config;

    if (!is_array($bridge)) {
        return;
    }

    if (empty($bridge['members'])) {
        log_error(sprintf('No members found on %s', $bridge['bridgeif']));
        return;
    }

    $members = explode(',', $bridge['members']);
    if (!count($members)) {
        return;
    }

    /* Calculate smaller mtu and enforce it */
    $mtu = null;
    $foundgif = false;
    foreach ($members as $member) {
        $realif = get_real_interface($member);
        $opts = legacy_interface_stats($realif);
        if (substr($realif, 0, 3) == "gif") {
            $foundgif = true;
            if ($checkmember == 1) {
                return;
            }
            if ($opts['mtu'] <= 1500) {
                continue;
            }
        }
        if (!empty($opts['mtu']) && ($mtu == null || $opts['mtu'] < $mtu)) {
            $mtu = $opts['mtu'];
        }
    }

    if (!$foundgif && $checkmember == 2) {
        return;
    }

    if (file_exists("/var/run/booting") || !empty($bridge['bridgeif'])) {
        legacy_interface_destroy($bridge['bridgeif']);
        legacy_interface_create($bridge['bridgeif']);
        $bridgeif = $bridge['bridgeif'];
    } else {
        $bridgeif = legacy_interface_create('bridge');
        $bridge['bridgeif'] = $bridgeif;
    }

    $checklist = get_configured_interface_list();

    /* Add interfaces to bridge */
    foreach ($members as $member) {
        if (empty($checklist[$member])) {
            continue;
        }
        $realif = get_real_interface($member);
        if (!$realif) {
            log_error('realif not defined in interfaces bridge - up');
            continue;
        }
        /* make sure the parent interface is up */
        legacy_interface_mtu($realif, $mtu);
        configure_interface_hardware($realif);
        interfaces_bring_up($realif);
        legacy_bridge_member($bridge['bridgeif'], $realif);
    }

    if (isset($bridge['enablestp'])) {
        /* Choose spanning tree proto */
        mwexec("/sbin/ifconfig {$bridgeif} proto " . escapeshellarg($bridge['proto']));

        if (!empty($bridge['stp'])) {
            $stpifs = explode(',', $bridge['stp']);
            foreach ($stpifs as $stpif) {
                $realif = get_real_interface($stpif);
                mwexec("/sbin/ifconfig {$bridgeif} stp {$realif}");
            }
        }
        if (!empty($bridge['maxage'])) {
            mwexec("/sbin/ifconfig {$bridgeif} maxage " . escapeshellarg($bridge['maxage']));
        }
        if (!empty($bridge['fwdelay'])) {
            mwexec("/sbin/ifconfig {$bridgeif} fwddelay " . escapeshellarg($bridge['fwdelay']));
        }
        if (!empty($bridge['hellotime'])) {
            mwexec("/sbin/ifconfig {$bridgeif} hellotime " . escapeshellarg($bridge['hellotime']));
        }
        if (!empty($bridge['priority'])) {
            mwexec("/sbin/ifconfig {$bridgeif} priority " . escapeshellarg($bridge['priority']));
        }
        if (!empty($bridge['holdcnt'])) {
            mwexec("/sbin/ifconfig {$bridgeif} holdcnt " . escapeshellarg($bridge['holdcnt']));
        }
        if (!empty($bridge['ifpriority'])) {
            $pconfig = explode(",", $bridge['ifpriority']);
            $ifpriority = array();
            foreach ($pconfig as $cfg) {
                $embcfg = explode_assoc(":", $cfg);
                foreach ($embcfg as $key => $value) {
                    $ifpriority[$key] = $value;
                }
            }
            foreach ($ifpriority as $key => $value) {
                $realif = get_real_interface($key);
                mwexec("/sbin/ifconfig ${bridgeif} ifpriority {$realif} " . escapeshellarg($value));
            }
        }
        if (!empty($bridge['ifpathcost'])) {
            $pconfig = explode(",", $bridge['ifpathcost']);
            $ifpathcost = array();
            foreach ($pconfig as $cfg) {
                $embcfg = explode_assoc(":", $cfg);
                foreach ($embcfg as $key => $value) {
                    $ifpathcost[$key] = $value;
                }
            }
            foreach ($ifpathcost as $key => $value) {
                $realif = get_real_interface($key);
                mwexec("/sbin/ifconfig ${bridgeif} ifpathcost {$realif} " . escapeshellarg($value));
            }
        }
    }

    if ($bridge['maxaddr'] <> "") {
        mwexec("/sbin/ifconfig {$bridgeif} maxaddr " . escapeshellarg($bridge['maxaddr']));
    }
    if ($bridge['timeout'] <> "") {
        mwexec("/sbin/ifconfig {$bridgeif} timeout " . escapeshellarg($bridge['timeout']));
    }
    if (!empty($bridge['span'])) {
        $realif = get_real_interface($bridge['span']);
        mwexec("/sbin/ifconfig {$bridgeif} span {$realif}");
    }
    if (!empty($bridge['edge'])) {
        $edgeifs = explode(',', $bridge['edge']);
        foreach ($edgeifs as $edgeif) {
            $realif = get_real_interface($edgeif);
            mwexec("/sbin/ifconfig {$bridgeif} edge {$realif}");
        }
    }
    if (!empty($bridge['autoedge'])) {
        $edgeifs = explode(',', $bridge['autoedge']);
        foreach ($edgeifs as $edgeif) {
            $realif = get_real_interface($edgeif);
            mwexec("/sbin/ifconfig {$bridgeif} -autoedge {$realif}");
        }
    }
    if (!empty($bridge['ptp'])) {
        $ptpifs = explode(',', $bridge['ptp']);
        foreach ($ptpifs as $ptpif) {
            $realif = get_real_interface($ptpif);
            mwexec("/sbin/ifconfig {$bridgeif} ptp {$realif}");
        }
    }
    if (!empty($bridge['autoptp'])) {
        $ptpifs = explode(',', $bridge['autoptp']);
        foreach ($ptpifs as $ptpif) {
            $realif = get_real_interface($ptpif);
            mwexec("/sbin/ifconfig {$bridgeif} -autoptp {$realif}");
        }
    }
    if (!empty($bridge['static'])) {
        $stickyifs = explode(',', $bridge['static']);
        foreach ($stickyifs as $stickyif) {
            $realif = get_real_interface($stickyif);
            mwexec("/sbin/ifconfig {$bridgeif} sticky {$realif}");
        }
    }
    if (!empty($bridge['private'])) {
        $privateifs = explode(',', $bridge['private']);
        foreach ($privateifs as $privateif) {
            $realif = get_real_interface($privateif);
            mwexec("/sbin/ifconfig {$bridgeif} private {$realif}");
        }
    }

    if ($bridge['bridgeif']) {
        interfaces_bring_up($bridge['bridgeif']);
    } else {
        log_error('bridgeif not defined -- could not bring interface up');
    }
}

function interface_bridge_add_member($bridgeif, $interface)
{
    if (!does_interface_exist($bridgeif) || !does_interface_exist($interface)) {
        return;
    }

    $mtu = legacy_interface_stats($bridgeif)['mtu'];
    $mtum = legacy_interface_stats($interface)['mtu'];

    if ($mtu != $mtum && !(substr($interface, 0, 3) == "gif" && $mtu <= 1500)) {
        legacy_interface_mtu($interface, $mtu);
    }

    configure_interface_hardware($interface);
    interfaces_bring_up($interface);
    legacy_bridge_member($bridgeif, $interface);
}

function interfaces_lagg_configure($realif = '', $verbose = false)
{
    global $config;

    if (!isset($config['laggs']['lagg'])) {
        return;
    }

    if ($verbose) {
        echo 'Configuring LAGG interfaces...';
        flush();
    }

    $i = 0;

    foreach ($config['laggs']['lagg'] as $lagg) {
        if (empty($lagg['laggif'])) {
            $lagg['laggif'] = "lagg{$i}";
        }
        if (!empty($realif) && $realif != $lagg['laggif']) {
            continue;
        }
        interface_lagg_configure($lagg);
        $i++;
    }

    if ($verbose) {
        echo "done.\n";
    }
}

function interface_lagg_configure(&$lagg)
{
    global $config;

    if (!is_array($lagg)) {
        return -1;
    }

    $members = explode(',', $lagg['members']);
    if (!count($members)) {
        return -1;
    }

    if (file_exists("/var/run/booting") || !(empty($lagg['laggif']))) {
        legacy_interface_destroy($lagg['laggif']);
        legacy_interface_create($lagg['laggif']);
        $laggif = $lagg['laggif'];
    } else {
        $laggif = legacy_interface_create('lagg');
    }

    /* Calculate smaller mtu and enforce it */
    $mtu = null;
    foreach ($members as $member) {
        $opts = legacy_interface_stats($member);
        if (!empty($opts['mtu']) && ($mtu == null || $opts['mtu'] < $mtu)) {
            $mtu = $opts['mtu'];
        }
    }

    $checklist = get_interface_list();
    foreach ($members as $member) {
        if (!array_key_exists($member, $checklist)) {
            continue;
        }

        legacy_interface_mtu($member, $mtu);
        configure_interface_hardware($member);
        interfaces_bring_up($member);
        mwexec("/sbin/ifconfig {$laggif} laggport {$member}");
    }

    mwexec("/sbin/ifconfig {$laggif} laggproto " . escapeshellarg($lagg['proto']));
    if (!empty($lagg['lacp_fast_timeout'])) {
        mwexec("/sbin/ifconfig {$laggif} lacp_fast_timeout");
    } elseif ($lagg['proto'] == 'lacp') {
        mwexec("/sbin/ifconfig {$laggif} -lacp_fast_timeout");
    }

    interfaces_bring_up($laggif);

    return $laggif;
}

function interfaces_gre_configure($checkparent = 0, $verbose = false, $realif = '')
{
    global $config;

    if (!isset($config['gres']['gre'])) {
        return;
    }

    if ($verbose) {
        echo "Configuring GRE interfaces ($checkparent)...";
        flush();
    }

    foreach ($config['gres']['gre'] as $i => $gre) {
        if (empty($gre['greif'])) {
            $gre['greif'] = "gre{$i}";
        }
        if (!empty($realif) && $realif != $gre['greif']) {
            continue;
        }

        if ($checkparent == 1) {
            if (strstr($gre['if'], '_vip')) {
                continue;
            }
            if (!empty($config['interfaces'][$gre['if']]) && $config['interfaces'][$gre['if']]['ipaddrv6'] == 'track6') {
                continue;
            }
        } elseif ($checkparent == 2) {
            if (strstr($gre['if'], '_vip')) {
                continue;
            }
            if (empty($config['interfaces'][$gre['if']]) || $config['interfaces'][$gre['if']]['ipaddrv6'] != 'track6') {
                continue;
            }
        }

        interface_gre_configure($gre);
    }

    if ($verbose) {
        echo "done.\n";
    }
}

/* NOTE: $grekey is not used but useful for passing this function to array_walk. */
function interface_gre_configure(&$gre, $grekey = "")
{
    global $config;

    if (!is_array($gre)) {
        return -1;
    }

    $realif = get_real_interface($gre['if']);
    $realifip = get_interface_ip($gre['if']);

    /* make sure the parent interface is up */
    interfaces_bring_up($realif);

    if (file_exists("/var/run/booting") || !(empty($gre['greif']))) {
        legacy_interface_destroy($gre['greif']);
        legacy_interface_create($gre['greif']);
        $greif = $gre['greif'];
    } else {
        $greif = legacy_interface_create('gre');
    }

    /* Do not change the order here for more see gre(4) NOTES section. */
    mwexec("/sbin/ifconfig {$greif} tunnel {$realifip} " . escapeshellarg($gre['remote-addr']));
    if ((is_ipaddrv6($gre['tunnel-local-addr'])) || (is_ipaddrv6($gre['tunnel-remote-addr']))) {
        /* XXX: The prefixlen argument for tunnels of ipv6 is useless since it needs to be 128 as enforced by kernel */
        //mwexec("/sbin/ifconfig {$greif} inet6 " . escapeshellarg($gre['tunnel-local-addr']) . " " . escapeshellarg($gre['tunnel-remote-addr']) . " prefixlen /" . escapeshellarg($gre['tunnel-remote-net']));
        mwexec("/sbin/ifconfig {$greif} inet6 " . escapeshellarg($gre['tunnel-local-addr']) . " " . escapeshellarg($gre['tunnel-remote-addr']) . " prefixlen 128");
    } else {
        mwexec("/sbin/ifconfig {$greif} " . escapeshellarg($gre['tunnel-local-addr']) . " " . escapeshellarg($gre['tunnel-remote-addr']) . " netmask " . gen_subnet_mask($gre['tunnel-remote-net']));
    }

    if (isset($gre['link0'])) {
        legacy_interface_flags($greif, 'link0');
    }
    if (isset($gre['link1'])) {
        legacy_interface_flags($greif, 'link1');
    }
    if (isset($gre['link2'])) {
        legacy_interface_flags($greif, 'link2');
    }

    interfaces_bring_up($greif);

    if (isset($gre['link1']) && $gre['link1']) {
        mwexecf(
            '/sbin/route add %s/%s %s',
            array(
                $gre['tunnel-remote-addr'],
                $gre['tunnel-remote-net'],
                $gre['tunnel-local-addr']
            )
        );
    }

    if (is_ipaddrv4($gre['tunnel-remote-addr'])) {
        file_put_contents("/tmp/{$greif}_router", $gre['tunnel-remote-addr']);
    }
    if (is_ipaddrv6($gre['tunnel-remote-addr'])) {
        file_put_contents("/tmp/{$greif}_routerv6", $gre['tunnel-remote-addr']);
    }

    interfaces_bring_up($greif);

    return $greif;
}

function interfaces_gif_configure($checkparent = 0, $verbose = false, $realif = '')
{
    global $config;

    if (!isset($config['gifs']['gif'])) {
        return;
    }

    if ($verbose) {
        echo "Configuring GIF interfaces ($checkparent)...";
        flush();
    }

    foreach ($config['gifs']['gif'] as $i => $gif) {
        if (empty($gif['gifif'])) {
            $gre['gifif'] = "gif{$i}";
        }
        if (!empty($realif) && $realif != $gif['gifif']) {
            continue;
        }

        if ($checkparent == 1) {
            if (strstr($gif['if'], '_vip')) {
                continue;
            }
            if (!empty($config['interfaces'][$gif['if']]) && $config['interfaces'][$gif['if']]['ipaddrv6'] == 'track6') {
                continue;
            }
        } elseif ($checkparent == 2) {
            if (strstr($gif['if'], '_vip')) {
                continue;
            }
            if (empty($config['interfaces'][$gif['if']]) || $config['interfaces'][$gif['if']]['ipaddrv6'] != 'track6') {
                continue;
            }
        }

        interface_gif_configure($gif);
    }

    if ($verbose) {
        echo "done.\n";
    }
}

/* NOTE: $gifkey is not used but useful for passing this function to array_walk. */
function interface_gif_configure(&$gif, $gifkey = "")
{
    global $config;

    if (!is_array($gif)) {
        return -1;
    }

    $realif = get_real_interface($gif['if']);
    $ipaddr = $gif['ipaddr'];

    if (is_ipaddrv4($gif['remote-addr'])) {
        if (is_ipaddrv4($ipaddr)) {
            $realifip = $ipaddr;
        } else {
            $realifip = get_interface_ip($gif['if']);
        }
        $realifgw = get_interface_gateway($gif['if']);
    } elseif (is_ipaddrv6($gif['remote-addr'])) {
        if (is_ipaddrv6($ipaddr)) {
            $realifip = $ipaddr;
        } else {
            $realifip = get_interface_ipv6($gif['if']);
        }
        $realifgw = get_interface_gateway_v6($gif['if']);
    }
    /* make sure the parent interface is up */
    if ($realif) {
        interfaces_bring_up($realif);
    } else {
        log_error('could not bring realif up -- variable not defined -- interface_gif_configure()');
    }

    if (file_exists("/var/run/booting") || !(empty($gif['gifif']))) {
        legacy_interface_destroy($gif['gifif']);
        legacy_interface_create($gif['gifif']);
        $gifif = $gif['gifif'];
    } else {
        $gifif = legacy_interface_create('gif');
    }

    /* Do not change the order here for more see gif(4) NOTES section. */
    mwexec("/sbin/ifconfig {$gifif} tunnel {$realifip} " . escapeshellarg($gif['remote-addr']));
    if ((is_ipaddrv6($gif['tunnel-local-addr'])) || (is_ipaddrv6($gif['tunnel-remote-addr']))) {
        /* XXX: The prefixlen argument for tunnels of ipv6 is useless since it needs to be 128 as enforced by kernel */
        //mwexec("/sbin/ifconfig {$gifif} inet6 " . escapeshellarg($gif['tunnel-local-addr']) . " " . escapeshellarg($gif['tunnel-remote-addr']) . " prefixlen /" . escapeshellarg($gif['tunnel-remote-net']));
        mwexec("/sbin/ifconfig {$gifif} inet6 " . escapeshellarg($gif['tunnel-local-addr']) . " " . escapeshellarg($gif['tunnel-remote-addr']) . " prefixlen 128");
    } else {
        mwexec("/sbin/ifconfig {$gifif} " . escapeshellarg($gif['tunnel-local-addr']) . " " . escapeshellarg($gif['tunnel-remote-addr']) . " netmask " . gen_subnet_mask($gif['tunnel-remote-net']));
    }

    if (isset($gif['link0'])) {
        legacy_interface_flags($gifif, 'link0');
    }
    if (isset($gif['link1'])) {
        legacy_interface_flags($gifif, 'link1');
    }

    interfaces_bring_up($gifif);

    $iflist = get_configured_interface_list();
    foreach ($iflist as $ifname) {
        if ($config['interfaces'][$ifname]['if'] == $gifif) {
            if (get_interface_gateway($ifname) || get_interface_gateway_v6($ifname)) {
                system_routing_configure($ifname);
                break;
            }
        }
    }

    if (is_ipaddrv4($gif['tunnel-remote-addr'])) {
        file_put_contents("/tmp/{$gifif}_router", $gif['tunnel-remote-addr']);
    }
    if (is_ipaddrv6($gif['tunnel-remote-addr'])) {
        file_put_contents("/tmp/{$gifif}_routerv6", $gif['tunnel-remote-addr']);
    }

    if (is_ipaddrv4($realifgw)) {
        mwexec("/sbin/route delete -host " . escapeshellarg($gif['remote-addr']));
        mwexec("/sbin/route add -host " . escapeshellarg($gif['remote-addr']) . " {$realifgw}");
    }
    if (is_ipaddrv6($realifgw)) {
        mwexec("/sbin/route delete -host -inet6 " . escapeshellarg($gif['remote-addr']));
        mwexec("/sbin/route add -host -inet6 " . escapeshellarg($gif['remote-addr']) . " {$realifgw}");
    }

    interfaces_bring_up($gifif);

    return $gifif;
}

function interfaces_configure($verbose = false)
{
    global $config;

    interfaces_loopback_configure($verbose);
    interfaces_create_wireless_clones($verbose);
    interfaces_lagg_configure('', $verbose);
    interfaces_vlan_configure('', $verbose);
    interfaces_qinq_configure($verbose);

    $iflist = get_configured_interface_with_descr();
    $delayed_list = array();
    $bridge_list = array();
    $track6_list = array();

    /* This is needed to speedup interfaces on bootup. */
    $reload = !file_exists('/var/run/booting');

    foreach ($iflist as $if => $ifname) {
        $realif = $config['interfaces'][$if]['if'];
        if (strstr($realif, "bridge")) {
            $bridge_list[$if] = $ifname;
        } elseif (strstr($realif, 'gre') || strstr($realif, 'gif') || strstr($realif, 'ovpn')) {
            $delayed_list[$if] = $ifname;
        } elseif (!empty($config['interfaces'][$if]['ipaddrv6']) && $config['interfaces'][$if]['ipaddrv6'] == 'track6') {
            $track6_list[$if] = $ifname;
        } else {
            interface_configure($if, $reload, false, $verbose);
        }
    }

    /*
     * NOTE: The following function parameter consists of
     *  1 - Do not load gre/gif/bridge with parent/member as vip
     *  2 - Do load gre/gif/bridge with parent/member as vip
     */

    interfaces_gre_configure(1, $verbose);
    interfaces_gif_configure(1, $verbose);
    interfaces_bridge_configure(1);

    foreach ($track6_list as $if => $ifname) {
        interface_configure($if, $reload, false, $verbose);
    }

    interfaces_vips_configure('', $verbose);
    interfaces_gre_configure(2, $verbose);
    interfaces_gif_configure(2, $verbose);

    foreach ($delayed_list as $if => $ifname) {
        interface_configure($if, $reload, false, $verbose);
    }

    interfaces_bridge_configure(2);

    foreach ($bridge_list as $if => $ifname) {
        interface_configure($if, $reload, false, $verbose);
    }

    interfaces_group_setup();

    if ($reload) {
        system_routing_configure('', $verbose);
        ipsec_configure_do($verbose);
        plugins_configure('dns', $verbose);
        services_dhcpd_configure('all', array(), $verbose);
    }
}

function interface_vip_bring_down($vip)
{
    $vipif = get_real_interface($vip['interface']);
    switch ($vip['mode']) {
        case 'proxyarp':
            killbypid("/var/run/choparp_{$vipif}.pid");
            break;
        case 'ipalias':
            if (does_interface_exist($vipif)) {
                if (is_ipaddrv6($vip['subnet'])) {
                    mwexec("/sbin/ifconfig {$vipif} inet6 " . escapeshellarg($vip['subnet']) . " -alias");
                } else {
                    legacy_interface_deladdress($vipif, $vip['subnet']);
                }
            }
            break;
        case 'carp':
            if (does_interface_exist($vipif)) {
                legacy_interface_deladdress($vipif, $vip['subnet']);
            }
            break;
    }
}

function interface_bring_down($interface = "wan", $destroy = false, $ifacecfg = false)
{
    global $config;

    if (!isset($config['interfaces'][$interface])) {
        return;
    }

    /*
     * NOTE: The $realifv6 is needed when WANv4 is type PPP and v6 is DHCP and the option v6 from v4 is used.
     * In this case the real $realif of v4 is different from that of v6 for operation.
     * Keep this in mind while doing changes here!
     */
    if ($ifacecfg === false) {
        $ifcfg = $config['interfaces'][$interface];
        $ppps = array();
        if (isset($config['ppps']['ppp'])) {
            $ppps = $config['ppps']['ppp'];
        }
        $realif = get_real_interface($interface);
        $realifv6 = get_real_interface($interface, "inet6", true);
    } elseif (!is_array($ifacecfg)) {
        log_error('Wrong parameters used during interface_bring_down()');
        $ifcfg = $config['interfaces'][$interface];
        $ppps = array();
        if (isset($config['ppps']['ppp'])) {
            $ppps = $config['ppps']['ppp'];
        }
        $realif = get_real_interface($interface);
        $realifv6 = get_real_interface($interface, "inet6", true);
    } else {
        $ifcfg = $ifacecfg['ifcfg'];
        $ppps = $ifacecfg['ppps'];
        if (isset($ifacecfg['ifcfg']['realif'])) {
            $realif = $ifacecfg['ifcfg']['realif'];
            /* XXX: Any better way? */
            $realifv6 = $realif;
        } else {
            $realif = get_real_interface($interface);
            $realifv6 = get_real_interface($interface, "inet6", true);
        }
    }

    switch ($ifcfg['ipaddr']) {
        case "ppp":
        case "pppoe":
        case "pptp":
        case "l2tp":
            if (is_array($ppps) && count($ppps)) {
                foreach ($ppps as $pppid => $ppp) {
                    if ($realif == $ppp['if']) {
                        if (isset($ppp['ondemand']) && !$destroy) {
                            configd_run("interface reconfigure {$interface}");
                            break;
                        }
                        if (isvalidpid("/var/run/{$ppp['type']}_{$interface}.pid")) {
                            killbypid("/var/run/{$ppp['type']}_{$interface}.pid");
                            sleep(2);
                        }
                        @unlink("/var/etc/mpd_{$interface}.conf");
                        break;
                    }
                }
            }
            break;
        case "dhcp":
            kill_dhclient_process($realif);
            @unlink("/var/etc/dhclient_{$interface}.conf");
            if (does_interface_exist("$realif")) {
                mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " delete", true);
                interface_ipalias_cleanup($interface);
                if ($destroy) {
                    legacy_interface_flags($realif, 'down');
                }
                mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
            }
            break;
        default:
            if (does_interface_exist("$realif")) {
                mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " delete", true);
                interface_ipalias_cleanup($interface);
                if ($destroy) {
                    legacy_interface_flags($realif, 'down');
                }
                mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
            }
            break;
    }

    $track6 = array();
    if (isset($ifcfg['ipaddrv6'])) {
        $ipaddrv6 = $ifcfg['ipaddrv6'];
    } else {
        $ipaddrv6 = null;
    }
    switch ($ipaddrv6) {
        case "slaac":
        case "dhcp6":
            killbypid("/var/run/dhcp6c_{$realif}.pid", 'TERM', true);
            @unlink("/var/etc/dhcp6c_{$interface}.conf");
            if (does_interface_exist($realifv6)) {
                $ip6 = find_interface_ipv6($realifv6);
                if (is_ipaddrv6($ip6) && $ip6 != "::") {
                    mwexec("/sbin/ifconfig " . escapeshellarg($realifv6) . " inet6 {$ip6} delete", true);
                }
                interface_ipalias_cleanup($interface, "inet6");
                if ($destroy) {
                    legacy_interface_flags($realif, 'down');
                }
                mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
            }
            $track6 = link_interface_to_track6($interface);
            break;
        case "6rd":
        case "6to4":
            $realif = "{$interface}_stf";
            if (does_interface_exist("$realif")) {
                $ip6 = get_interface_ipv6($interface);
                if (is_ipaddrv6($ip6)) {
                    mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$ip6} delete", true);
                }
                interface_ipalias_cleanup($interface, "inet6");
                if ($destroy) {
                    legacy_interface_flags($realif, 'down');
                }
            }
            $track6 = link_interface_to_track6($interface);
            break;
        default:
            if (does_interface_exist("$realif")) {
                $ip6 = get_interface_ipv6($interface);
                if (is_ipaddrv6($ip6)) {
                    mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$ip6} delete", true);
                }
                if (!empty($ifcfg['ipaddrv6']) && is_ipaddrv6($ifcfg['ipaddrv6'])) {
                    mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$ifcfg['ipaddrv6']} delete", true);
                }
                interface_ipalias_cleanup($interface, "inet6");
                if ($destroy) {
                    legacy_interface_flags($realif, 'down');
                }
                mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
            }
            $track6 = link_interface_to_track6($interface);
            break;
    }

    if (!empty($track6) && is_array($track6)) {
        /* Bring down radvd and dhcp6 on these interfaces */
        services_dhcpd_configure('inet6', $track6);
    }

    $old_router = '';
    if (file_exists("/tmp/{$realif}_router")) {
        $old_router = trim(file_get_contents("/tmp/{$realif}_router"));
    }

    if (!empty($old_router)) {
        log_error("Clearing states to old gateway {$old_router}.");
        mwexec("/sbin/pfctl -i " . escapeshellarg($realif) . " -Fs");
    }

    @unlink("/var/db/{$interface}ip");
    @unlink("/var/db/{$interface}ipv6");
    @unlink("/var/etc/nameserver_{$realif}");
    @unlink("/var/etc/nameserver_v6{$realif}");
    @unlink("/var/etc/searchdomain_{$realif}");
    @unlink("/var/etc/searchdomain_v6{$realif}");
    @unlink("/tmp/{$realif}up");
    @unlink("/tmp/{$realif}upv6");
    @unlink("/tmp/{$realif}_router");
    @unlink("/tmp/{$realif}_routerv6");

    /* hostapd and wpa_supplicant do not need to be running when the interface is down.
     * They will also use 100% CPU if running after the wireless clone gets deleted. */
    if (isset($ifcfg['wireless']) && is_array($ifcfg['wireless'])) {
        kill_hostapd($realif);
        mwexec(kill_wpasupplicant($realif));
    }

    if ($destroy == true) {
        if (preg_match("/^[a-z0-9]+^tun|^ovpn|^gif|^gre|^lagg|^bridge|vlan|_stf$/i", $realif)) {
            legacy_interface_destroy($realif);
        }
    }

    return;
}

function interfaces_ptpid_used($ptpid)
{
    global $config;

    if (isset($config['ppps']['ppp'])) {
        foreach ($config['ppps']['ppp'] as & $settings) {
            if ($ptpid == $settings['ptpid']) {
                return true;
            }
        }
    }

    return false;
}

function interfaces_ptpid_next()
{

    $ptpid = 0;
    while (interfaces_ptpid_used($ptpid)) {
        $ptpid++;
    }

    return $ptpid;
}

/*
 * This function can configure PPPoE, MLPPP (PPPoE), PPTP.
 * It writes the mpd config file to /var/etc every time the link is opened.
 */
function interface_ppps_configure($interface)
{
    global $config;

    /* Return for unassigned interfaces. This is a minimum requirement. */
    if (empty($config['interfaces'][$interface])) {
        return 0;
    }
    $ifcfg = $config['interfaces'][$interface];
    if (!isset($ifcfg['enable'])) {
        return 0;
    }

    // mpd5 requires a /var/spool/lock directory for PPP modem links.
    @mkdir("/var/spool/lock", 0777, true);

    // mpd5 modem chat script expected in the same directory as the mpd_xxx.conf files
    if (!file_exists('/var/etc/mpd.script')) {
        symlink('/usr/local/sbin/mpd.script', '/var/etc/mpd.script');
    }

    if (isset($config['ppps']['ppp'])) {
        foreach ($config['ppps']['ppp'] as $pppid => $ppp) {
            if ($ifcfg['if'] == $ppp['if']) {
                break;
            }
        }
    }
    if (!isset($ppp) || $ifcfg['if'] != $ppp['if']) {
        log_error(sprintf('Can\'t find PPP config for %s in interface_ppps_configure().', $ifcfg['if']));
        return 0;
    }

    if (file_exists("/var/run/booting")) {
        // Do not re-configure the interface if we are booting and it's already been started
        if (isvalidpid("/var/run/{$ppp['type']}_{$interface}.pid")) {
            return 0;
        }
    }

    $ports = explode(',', $ppp['ports']);
    if ($ppp['type'] != "ppp") {
        foreach ($ports as $pid => $port) {
            $ports[$pid] = get_real_interface($port);
            if (empty($ports[$pid])) {
                return 0;
            }
        }
    }
    $localips = isset($ppp['localip']) ? explode(',', $ppp['localip']) : array();
    $gateways = isset($ppp['gateway']) ? explode(',', $ppp['gateway']) : array();
    $subnets = isset($ppp['subnet']) ? explode(',', $ppp['subnet']) : array();

    /* We bring up the parent interface first because if DHCP is configured on the parent we need
     * to obtain an address first so we can write it in the mpd .conf file for PPTP and L2TP configs
     */
    foreach ($ports as $pid => $port) {
        switch ($ppp['type']) {
            case "pppoe":
                /* Bring the parent interface up */
                interfaces_bring_up($port);
                /* Enable setautosrc to automatically change mac address if parent interface's changes */
                mwexecf('/usr/sbin/ngctl msg %s: setautosrc 1', array($port));
                break;
            case "pptp":
            case "l2tp":
                /* configure interface */
                if (is_ipaddr($localips[$pid])) {
                    // Manually configure interface IP/subnet
                    legacy_interface_setaddress($port, "{$localips[$pid]}/{$subnets[$pid]}");
                    interfaces_bring_up($port);
                } elseif (empty($localips[$pid])) {
                    $localips[$pid] = get_interface_ip($port); // try to get the interface IP from the port
                }

                if (!is_ipaddr($localips[$pid])) {
                    log_error("Could not get a Local IP address for PPTP/L2TP link on {$port} in interfaces_ppps_configure. Using 0.0.0.0 ip!");
                    $localips[$pid] = "0.0.0.0";
                }
                if (!is_ipaddr($gateways[$pid])) {
                    log_error(sprintf('Could not get a PPTP/L2TP Remote IP address from %s for %s in interfaces_ppps_configure.', $dhcp_gateway, $gway));
                    return 0;
                }
                break;
            case "ppp":
                if (!file_exists("{$port}")) {
                    log_error(sprintf('Device %s does not exist. PPP link cannot start without the modem device.', $port));
                    return 0;
                }
                break;
            default:
                log_error(sprintf('Unkown %s configured as ppp interface.', $ppp['type']));
                break;
        }
    }

    // Construct the mpd.conf file
    $mpdconf = <<<EOD
startup:
  # configure the console
  set console close
  # configure the web server
  set web close

default:
{$ppp['type']}client:
  create bundle static {$interface}
  set bundle enable ipv6cp
  set iface name {$ifcfg['if']}

EOD;
    $setdefaultgw = false;
    $founddefaultgw = false;
    if (isset($config['gateways']['gateway_item'])) {
        foreach ($config['gateways']['gateway_item'] as $gateway) {
            if ($interface == $gateway['interface'] && isset($gateway['defaultgw'])) {
                $setdefaultgw = true;
                break;
            } elseif (isset($gateway['defaultgw']) && !empty($gateway['interface'])) {
                $founddefaultgw = true;
                break;
            }
        }
    }

    if (!$founddefaultgw || $setdefaultgw) {
        $mpdconf .= "  set iface route default\n";
    }
    if (isset($ppp['ondemand'])) {
        $mpdconf .= "  set iface enable on-demand\n";
    } else {
        $mpdconf .= "  set iface disable on-demand\n";
    }
    if (!isset($ppp['idletimeout'])) {
        $mpdconf .= "  set iface idle 0\n";
    } else {
        $mpdconf .= "  set iface idle {$ppp['idletimeout']}\n";
    }

    if (isset($ppp['ondemand'])) {
        $mpdconf .= "  set iface addrs 10.10.1.1 10.10.1.2\n";
    }

    if (isset($ppp['tcpmssfix'])) {
        $mpdconf .= "  set iface disable tcpmssfix\n";
    } else {
        $mpdconf .= "  set iface enable tcpmssfix\n";
    }

    $mpdconf .= "  set iface up-script /usr/local/sbin/ppp-linkup\n";
    $mpdconf .= "  set iface down-script /usr/local/sbin/ppp-linkdown\n";
    if ($ppp['type'] == "ppp") {
        if (is_ipaddr($ppp['localip'])) {
            $localip = $ppp['localip'];
        } else {
            $localip = '0.0.0.0';
        }
        if (is_ipaddr($ppp['gateway'])) {
            $gateway = $ppp['gateway'];
        } else {
            $gateway = "10.64.64.{$pppid}";
        }
        $mpdconf .= "  set ipcp ranges {$localip}/0 {$gateway}/0\n";
    } else {
        $mpdconf .= "  set ipcp ranges 0.0.0.0/0 0.0.0.0/0\n";
    }

    if (isset($ppp['vjcomp'])) {
        $mpdconf .= "  set ipcp no vjcomp\n";
    }

    if (isset($config['system']['dnsallowoverride'])) {
        $mpdconf .= "  set ipcp enable req-pri-dns\n";
        $mpdconf .= "  set ipcp enable req-sec-dns\n";
    }
    foreach ($ports as $pid => $port) {
        $mpdconf_arr = array();
        $port = get_real_interface($port);
        if ($ppp['type'] == "ppp") {
            $mpdconf_arr[] = "create link static {$interface}_link{$pid} modem";
        } else {
            $mpdconf_arr[] = "create link static {$interface}_link{$pid} {$ppp['type']}";
        }
        $mpdconf_arr[] = "set link action bundle {$interface}";
        if (count($ports) > 1) {
            $mpdconf_arr[] = "set link enable multilink";
        } else {
            $mpdconf_arr[] = "set link disable multilink";
        }
        $mpdconf_arr[] = "set link keep-alive 10 60";
        $mpdconf_arr[] = "set link max-redial 0";
        if (isset($ppp['shortseq'])) {
            $mpdconf_arr[] = "set link no shortseq";
        }
        if (isset($ppp['acfcomp'])) {
            $mpdconf_arr[] = "set link no acfcomp";
        }
        if (isset($ppp['protocomp'])) {
            $mpdconf_arr[] = "set link no protocomp";
        }
        $mpdconf_arr[] = "set link disable chap pap";
        $mpdconf_arr[] = "set link accept chap pap eap";
        $mpdconf_arr[] = "set link disable incoming";
        $bandwidths = !empty($ppp['bandwidth']) ? explode(',', $ppp['bandwidth']) : null;
        if (!empty($bandwidths[$pid])) {
            $mpdconf_arr[] = "set link bandwidth {$bandwidths[$pid]}";
        }

        $mtus = !empty($ppp['mtu']) ? explode(',', $ppp['mtu']) : null;
        if (empty($mtus[$pid])) {
            $mtus[$pid] = !empty($ifcfg['mtu']) ? intval($ifcfg['mtu']) : 1500;
        }
        if ($ppp['type'] == "pppoe" && $mtus[$pid] > 1500 ) {
            // use pppoe max-payload if mtu we're about to set > 1492
            $mpdconf_arr[] = "set pppoe max-payload " . ($mtus[$pid]-8);
        } else {
            $mpdconf_arr[] = "set link mtu " . ($mtus[$pid]-8);
        }
        $mrus = !empty($ppp['mtu']) ? explode(',', $ppp['mru']) : null;
        if (!empty($mrus[$pid])) {
            $mpdconf_arr[] = "set link mru {$mrus[$pid]}";
        }
        $mrrus = !empty($ppp['mrru']) ? explode(',', $ppp['mrru']) : null;
        if (!empty($mrrus[$pid])) {
            $mpdconf_arr[] = "set link mrru {$mrrus[$pid]}";
        }

        if (empty($ppp['username']) && $ppp['type'] == "ppp") {
            $mpdconf_arr[] = "set auth authname \"user\"";
        } else {
            $mpdconf_arr[] = "set auth authname \"{$ppp['username']}\"";
        }
        if (empty($ppp['password']) && $ppp['type'] == "ppp") {
            $mpdconf_arr[] = "set auth password " .  base64_decode('none');
        } else {
            $mpdconf_arr[] = "set auth password " . base64_decode($ppp['password']);
        }

        if ($ppp['type'] == "ppp") {
            // ppp, modem connections
            $mpdconf_arr[] = "set modem device {$ppp['ports']}";
            $mpdconf_arr[] = "set modem script DialPeer";
            $mpdconf_arr[] = "set modem idle-script Ringback";
            $mpdconf_arr[] = "set modem watch -cd";
            $mpdconf_arr[] = "set modem var \$DialPrefix \"DT\"";
            $mpdconf_arr[] = "set modem var \$Telephone \"{$ppp['phone']}\"";
            if (isset($ppp['connect-timeout'])) {
                $mpdconf_arr[] = "set modem var \$ConnectTimeout \"{$ppp['connect-timeout']}\"";
            }
            if (isset($ppp['initstr'])) {
                $initstr = base64_decode($ppp['initstr']);
                $mpdconf_arr[] = "set modem var \$InitString \"{$initstr}\"";
            }
            if (isset($ppp['simpin'])) {
                $mpdconf_arr[] = "set modem var \$SimPin \"{$ppp['simpin']}\"";
                if (!empty($ppp['pin-wait'])) {
                    $mpdconf_arr[] = "set modem var \$PinWait \"{$ppp['pin-wait']}\"";
                } else {
                    $mpdconf_arr[] = "set modem var \$PinWait \"0\"";
                }
            }
            if (isset($ppp['apn'])) {
                $mpdconf_arr[] = "set modem var \$APN \"{$ppp['apn']}\"";
                if (empty($ppp['apnum'])) {
                    $mpdconf_arr[] = "set modem var \$APNum \"1\"";
                } else {
                    $mpdconf_arr[] = "set modem var \$APNum \"{$ppp['apnum']}\"";
                }
            }
        } elseif ($ppp['type'] == "pppoe") {
            $provider = isset($ppp['provider']) ? $ppp['provider'] : "";
            $mpdconf_arr[] = "set pppoe service \"{$provider}\"";
            $mpdconf_arr[] = "set pppoe iface {$port}";
        } elseif ($ppp['type'] == "pptp" || $ppp['type'] == "l2tp") {
            $mpdconf_arr[] = "set {$ppp['type']} self {$localips[$pid]}";
            $mpdconf_arr[] = "set {$ppp['type']} peer {$gateways[$pid]}";
        }

        foreach ($mpdconf_arr as $mpdconf_opt) {
            $mpdconf .= "  " . $mpdconf_opt . "\n";
        }

        $mpdconf .= "\topen\n";
    }


    /* Generate mpd.conf. If mpd_[interface].conf exists in the conf path, then link to it instead of generating a fresh conf file. */
    if (file_exists("/conf/mpd_{$interface}.conf")) {
        @symlink("/conf/mpd_{$interface}.conf", "/var/etc/mpd_{$interface}.conf");
    } else {
        $fd = fopen("/var/etc/mpd_{$interface}.conf", "w");
        if (!$fd) {
            log_error(sprintf('Error: cannot open mpd_%s.conf in interface_ppps_configure().', $interface));
            return 0;
        }
        // Write out mpd_ppp.conf
        fwrite($fd, $mpdconf);
        fclose($fd);
        unset($mpdconf);
    }

    // Create the uptime log if requested and if it doesn't exist already, or delete it if it is no longer requested.
    if (isset($ppp['uptime'])) {
        if (!file_exists("/conf/{$ifcfg['if']}.log")) {
            file_put_contents("/conf/{$ifcfg['if']}.log", '');
        }
    } else {
        if (file_exists("/conf/{$ifcfg['if']}.log")) {
            @unlink("/conf/{$ifcfg['if']}.log");
        }
    }

    /* clean up old lock files */
    foreach ($ports as $port) {
        @unlink("/var/spool/lock/LCK..{$port}");
    }

    /* fire up mpd */
    mwexec("/usr/local/sbin/mpd5 -b -k -d /var/etc -f mpd_{$interface}.conf -p /var/run/" .
        escapeshellarg($ppp['type']) . "_{$interface}.pid -s ppp " . escapeshellarg($ppp['type']) . "client");

    /* wait for up to 10 seconds for the interface to appear (ppp(oe)) */
    $i = 0;
    while ($i < 10) {
        exec("/sbin/ifconfig " . escapeshellarg($ppp['if']) . " 2>&1", $out, $ret);
        if ($ret == 0) {
            break;
        }
        sleep(1);
        $i++;
    }

    /* we only support the 3gstats.php for huawei modems for now. Will add more later. */
    /* We should be able to launch the right version for each modem */
    /* We can also guess the mondev from the manufacturer */
    exec("usbconfig | egrep -ie '(huawei)'", $usbmodemoutput);
    mwexec("/bin/ps auxww|grep \"{$interface}\" |grep \"[3]gstats\" | awk '{print $2}' |xargs kill");
    foreach ($ports as $port) {
        $mondev = '';
        if (preg_match("/huawei/i", implode("\n", $usbmodemoutput))) {
            $mondev  = substr(basename($port), 0, -1);
            $devlist = glob("/dev/{$mondev}?");
            $mondev = basename(end($devlist));
        }
        if (preg_match("/zte/i", implode("\n", $usbmodemoutput))) {
            $mondev  = substr(basename($port), 0, -1) . "1";
        }
        if ($mondev != '') {
            log_error("Starting 3gstats.php on device '{$mondev}' for interface '{$interface}'");
            mwexec_bg("/usr/local/sbin/3gstats.php {$mondev} {$interface}");
        }
    }

    return 1;
}

function interfaces_carp_setup($verbose = false)
{
    global $config;

    if ($verbose) {
        echo 'Configuring CARP settings...';
        flush();
    }

    set_single_sysctl("net.inet.carp.preempt", "1");

    if (!empty($config['hasync']['pfsyncinterface'])) {
        $carp_sync_int = get_real_interface($config['hasync']['pfsyncinterface']);
    }

    if (!empty($carp_sync_int) && isset($config['hasync']['pfsyncenabled'])) {
        if (isset($config['hasync']['pfsyncpeerip']) && is_ipaddr($config['hasync']['pfsyncpeerip'])) {
            $syncpeer = "syncpeer " . $config['hasync']['pfsyncpeerip'];
        } else {
            $syncpeer = "-syncpeer";
        }

        mwexec("/sbin/ifconfig pfsync0 syncdev {$carp_sync_int} {$syncpeer} up", false);
    } else {
        mwexec("/sbin/ifconfig pfsync0 -syncdev -syncpeer down", false);
    }

    if ($verbose) {
        echo "done.\n";
    }
}

function interface_proxyarp_configure($interface = '')
{
    global $config;

    /* kill any running choparp, on restart "all" */
    if (empty($interface)) {
        killbyname('choparp');
    }

    $paa = array();
    if (isset($config['virtualip']['vip'])) {
        /* group by interface */
        foreach ($config['virtualip']['vip'] as $vipent) {
            if ($vipent['mode'] === "proxyarp") {
                if (empty($interface) || $interface == $vipent['interface']) {
                    if (empty($paa[$vipent['interface']])) {
                        $paa[$proxyif] = array();
                    }
                    $paa[$vipent['interface']][] = $vipent;
                }
            }
        }
    }

    foreach ($paa as $paif => $paents) {
        $paaifip = get_interface_ip($paif);
        if (!is_ipaddr($paaifip)) {
            continue;
        }
        $vipif = get_real_interface($paif);
        $pid_filename = "/var/run/choparp_{$vipif}.pid";
        $args = "-p {$pid_filename} {$vipif} auto";
        foreach ($paents as $paent) {
            $args .= " " . escapeshellarg("{$paent['subnet']}/{$paent['subnet_bits']}");
        }
        if (!empty($interface)) {
            killbypid($pid_filename);
        }
        mwexec_bg("/usr/local/sbin/choparp " . $args);
    }
}

function interface_ipalias_cleanup($interface, $inet = 'inet4')
{
    global $config;

    if (isset($config['virtualip']['vip'])) {
        foreach ($config['virtualip']['vip'] as $vip) {
            if ($vip['mode'] == 'ipalias' && $vip['interface'] == $interface) {
                if ($inet == 'inet6' && is_ipaddrv6($vip['subnet'])) {
                    interface_vip_bring_down($vip);
                } elseif ($inet == 'inet4' && is_ipaddrv4($vip['subnet'])) {
                    interface_vip_bring_down($vip);
                }
            }
        }
    }
}

function interfaces_vips_configure($interface = '', $verbose = false)
{
    global $config;

    $paa = array();

    if (isset($config['virtualip']['vip'])) {
        $carp_setuped = false;
        $anyproxyarp = false;
        foreach ($config['virtualip']['vip'] as $vip) {
            if ($interface == "" || $vip['interface'] == $interface) {
                switch ($vip['mode']) {
                    case "proxyarp":
                        $anyproxyarp = true;
                        break;
                    case "ipalias":
                        interface_ipalias_configure($vip);
                        break;
                    case "carp":
                        if ($carp_setuped == false) {
                            $carp_setuped = true;
                        }
                        interface_carp_configure($vip);
                        break;
                }
            }
        }
        if ($carp_setuped == true) {
            interfaces_carp_setup($verbose);
        }
        if ($anyproxyarp == true) {
            interface_proxyarp_configure();
        }
    }
}

function interface_ipalias_configure(&$vip)
{
    global $config;

    if ($vip['mode'] != "ipalias") {
        return;
    }

    if ($vip['interface'] != 'lo0' && !isset($config['interfaces'][$vip['interface']]['enable'])) {
        return;
    }

    $if = get_real_interface($vip['interface']);
    $af = "inet";
    if (is_ipaddrv6($vip['subnet'])) {
        $af = "inet6";
    }
    mwexec("/sbin/ifconfig " . escapeshellarg($if) ." {$af} ". escapeshellarg($vip['subnet']) ."/" . escapeshellarg($vip['subnet_bits']) . " alias");
}

function interface_carp_configure(&$vip)
{
    global $config;

    if ($vip['mode'] != 'carp') {
        return;
    }

    // when CARP is temporary disabled, don't try to configure on any interface-up events
    if (get_single_sysctl('net.inet.carp.allow') == '0') {
        return;
    }

    /* NOTE: Maybe its useless nowdays */
    $realif = get_real_interface($vip['interface']);
    if (!does_interface_exist($realif)) {
        file_notice("CARP", sprintf(gettext("Interface specified for the virtual IP address %s does not exist. Skipping this VIP."), $vip['subnet']), "Firewall: Virtual IP", "");
        return;
    }

    if (is_ipaddrv4($vip['subnet'])) {
        /* Ensure a IP on this interface exists prior to configuring CARP. */
        $ww_subnet_ip = find_interface_ip($realif);
        if (!is_ipaddrv4($ww_subnet_ip)) {
            file_notice("CARP", sprintf(gettext("Sorry but we could not find a required assigned ip address on the interface for the virtual IP address %s."), $vip['subnet']), "Firewall: Virtual IP", "");
            return;
        }
    } elseif (is_ipaddrv6($vip['subnet'])) {
        /* Ensure a IP on this interface exists prior to configuring CARP. */
        $ww_subnet_ip = find_interface_ipv6($realif);
        if (!is_ipaddrv6($ww_subnet_ip)) {
            file_notice("CARP", sprintf(gettext("Sorry but we could not find a required assigned ip address on the interface for the virtual IPv6 address %s."), $vip['subnet']), "Firewall: Virtual IP", "");
            return;
        }
    }

    $vip_password = $vip['password'];
    $vip_password = escapeshellarg(addslashes(str_replace(" ", "", $vip_password)));
    if ($vip['password'] != "") {
        $password = " pass {$vip_password}";
    }

    $advbase = "";
    if (!empty($vip['advbase'])) {
        $advbase = "advbase " . escapeshellarg($vip['advbase']);
    }

    $carp_maintenancemode = isset($config["virtualip_carp_maintenancemode"]);
    if ($carp_maintenancemode) {
        $advskew = "advskew 254";
    } else {
        $advskew = "advskew " . escapeshellarg($vip['advskew']);
    }

    mwexec("/sbin/ifconfig {$realif} vhid " . escapeshellarg($vip['vhid']) . " {$advskew} {$advbase} {$password}");

    if (is_ipaddrv4($vip['subnet'])) {
        mwexec("/sbin/ifconfig {$realif} " . escapeshellarg($vip['subnet']) . "/" . escapeshellarg($vip['subnet_bits']) . " alias vhid " . escapeshellarg($vip['vhid']));
    } elseif (is_ipaddrv6($vip['subnet'])) {
        mwexec("/sbin/ifconfig {$realif} inet6 " . escapeshellarg($vip['subnet']) . " prefixlen " . escapeshellarg($vip['subnet_bits']) . " alias vhid " . escapeshellarg($vip['vhid']));
    }

    return $realif;
}

function interface_wireless_clone($realif, $wlcfg)
{
    global $config;

    /*   Check to see if interface has been cloned as of yet.
     *   If it has not been cloned then go ahead and clone it.
     */
    $needs_clone = false;
    if (isset($wlcfg['wireless']) && is_array($wlcfg['wireless'])) {
        $wlcfg_mode = $wlcfg['wireless']['mode'];
    } else {
        $wlcfg_mode = $wlcfg['mode'];
    }
    switch($wlcfg_mode) {
        case "hostap":
            $mode = "wlanmode hostap";
            break;
        case "adhoc":
            $mode = "wlanmode adhoc";
            break;
        default:
            $mode = "";
            break;
    }
    $baseif = interface_get_wireless_base($wlcfg['if']);
    if (does_interface_exist($realif)) {
        exec("/sbin/ifconfig " . escapeshellarg($realif), $output, $ret);
        $ifconfig_str = implode($output);
        if (($wlcfg_mode == "hostap") && (! preg_match("/hostap/si", $ifconfig_str))) {
            log_error(sprintf('Interface %s changed to hostap mode', $realif));
            $needs_clone = true;
        }
        if (($wlcfg_mode == "adhoc") && (! preg_match("/adhoc/si", $ifconfig_str))) {
            log_error(sprintf('Interface %s changed to adhoc mode', $realif));
            $needs_clone = true;
        }
        if (($wlcfg_mode == "bss") && (preg_match("/hostap|adhoc/si", $ifconfig_str))) {
            log_error(sprintf('Interface %s changed to infrastructure mode', $realif));
            $needs_clone = true;
        }
    } else {
        $needs_clone = true;
    }

    if ($needs_clone) {
        /* remove previous instance if it exists */
        if (does_interface_exist($realif)) {
            legacy_interface_destroy($realif);
        }

        log_error(sprintf('Cloning new wireless interface %s', $realif));
        // Create the new wlan interface. FreeBSD returns the new interface name.
        // example:  wlan2
        exec("/sbin/ifconfig wlan create wlandev {$baseif} {$mode} bssid 2>&1", $out, $ret);
        if ($ret <> 0) {
            log_error(sprintf('Failed to clone interface %s with error code %s, output %s', $baseif, $ret, $out[0]));
            return false;
        }
        $newif = trim($out[0]);
        // Rename the interface to {$parentnic}_wlan{$number}#: EX: ath0_wlan0
        legacy_interface_rename($newif, $realif);
        file_put_contents("/tmp/{$realif}_oldmac", get_interface_mac($realif));
    }
    return true;
}

function interface_sync_wireless_clones(&$ifcfg, $sync_changes = false)
{
    global $config;

    $shared_settings = array(
        'channel',
        'diversity',
        'protmode',
        'regcountry',
        'regdomain',
        'reglocation',
        'rxantenna',
        'standard',
        'turbo',
        'txantenna',
        'txpower',
    );

    if (!is_interface_wireless($ifcfg['if'])) {
        return;
    }

    $baseif = interface_get_wireless_base($ifcfg['if']);

    // Sync shared settings for assigned clones
    $iflist = get_configured_interface_list(false, true);
    foreach ($iflist as $if) {
        if ($baseif == interface_get_wireless_base($config['interfaces'][$if]['if']) && $ifcfg['if'] != $config['interfaces'][$if]['if']) {
            if (isset($config['interfaces'][$if]['wireless']['standard']) || $sync_changes) {
                foreach ($shared_settings as $setting) {
                    if ($sync_changes) {
                        if (isset($ifcfg['wireless'][$setting])) {
                            $config['interfaces'][$if]['wireless'][$setting] = $ifcfg['wireless'][$setting];
                        } elseif (isset($config['interfaces'][$if]['wireless'][$setting])) {
                            unset($config['interfaces'][$if]['wireless'][$setting]);
                        }
                    } else {
                        if (isset($config['interfaces'][$if]['wireless'][$setting])) {
                            $ifcfg['wireless'][$setting] = $config['interfaces'][$if]['wireless'][$setting];
                        } elseif (isset($ifcfg['wireless'][$setting])) {
                            unset($ifcfg['wireless'][$setting]);
                        }
                    }
                }
                if (!$sync_changes) {
                    break;
                }
            }
        }
    }

    // Read or write settings at shared area
    if (isset($config['wireless']['interfaces'][$baseif]) && is_array($config['wireless']['interfaces'][$baseif])) {
        foreach ($shared_settings as $setting) {
            if ($sync_changes) {
                if (isset($ifcfg['wireless'][$setting])) {
                    $config['wireless']['interfaces'][$baseif][$setting] = $ifcfg['wireless'][$setting];
                } elseif (isset($config['wireless']['interfaces'][$baseif][$setting])) {
                    unset($config['wireless']['interfaces'][$baseif][$setting]);
                }
            } elseif (isset($config['wireless']['interfaces'][$baseif][$setting])) {
                if (isset($config['wireless']['interfaces'][$baseif][$setting])) {
                    $ifcfg['wireless'][$setting] = $config['wireless']['interfaces'][$baseif][$setting];
                } elseif (isset($ifcfg['wireless'][$setting])) {
                    unset($ifcfg['wireless'][$setting]);
                }
            }
        }
    }

    // Sync the mode on the clone creation page with the configured mode on the interface
    if (stristr($ifcfg['if'], "_wlan") && isset($config['wireless']['clone']) && is_array($config['wireless']['clone'])) {
        foreach ($config['wireless']['clone'] as &$clone) {
            if ($clone['cloneif'] == $ifcfg['if']) {
                if ($sync_changes) {
                    $clone['mode'] = $ifcfg['wireless']['mode'];
                } else {
                    $ifcfg['wireless']['mode'] = $clone['mode'];
                }
                break;
            }
        }
        unset($clone);
    }
}

function interface_wireless_configure($if, &$wl, &$wlcfg)
{
    global $config;

   /*    open up a shell script that will be used to output the commands.
    *    since wireless is changing a lot, these series of commands are fragile
    *    and will sometimes need to be verified by a operator by executing the command
    *    and returning the output of the command to the developers for inspection.  please
    *    do not change this routine from a shell script to individual exec commands.  -sullrich
    */

    // Remove script file
    @unlink("/tmp/{$if}_setup.sh");

    // Clone wireless nic if needed.
    interface_wireless_clone($if, $wl);

    // Reject inadvertent changes to shared settings in case the interface hasn't been configured.
    interface_sync_wireless_clones($wl, false);

    $fd_set = fopen("/tmp/{$if}_setup.sh", "w");
    fwrite($fd_set, "#!/bin/sh\n");
    fwrite($fd_set, "# wireless configuration script.\n\n");

    /* set values for /path/program */
    $hostapd = "/usr/sbin/hostapd";
    $wpa_supplicant = "/usr/sbin/wpa_supplicant";
    $ifconfig = "/sbin/ifconfig";
    $sysctl = "/sbin/sysctl";
    $killall = "/usr/bin/killall";

    /* Set all wireless ifconfig variables (split up to get rid of needed checking) */

    $wlcmd = array();
    $wl_sysctl = array();
    /* Make sure it's up */
    $wlcmd[] = "up";
    /* Set a/b/g standard */
    $standard = str_replace(" Turbo", "", $wlcfg['standard']);
    $wlcmd[] = "mode " . escapeshellarg($standard);

    /* XXX: Disable ampdu for now on mwl when running in 11n mode
     * to prevent massive packet loss under certain conditions. */
    if (preg_match("/^mwl/i", $if) && ($standard == "11ng" || $standard == "11na")) {
        $wlcmd[] = "-ampdu";
    }

    /* Set ssid */
    if ($wlcfg['ssid']) {
        $wlcmd[] = "ssid " . escapeshellarg($wlcfg['ssid']);
    }

    /* Set 802.11g protection mode */
    $wlcmd[] = "protmode " . escapeshellarg($wlcfg['protmode']);

    /* set wireless channel value */
    if (isset($wlcfg['channel'])) {
        if ($wlcfg['channel'] == "0") {
            $wlcmd[] = "channel any";
        } else {
            $wlcmd[] = "channel " . escapeshellarg($wlcfg['channel']);
        }
    }

    /* Set antenna diversity value */
    if (isset($wlcfg['diversity'])) {
        $wl_sysctl[] = "diversity=" . escapeshellarg($wlcfg['diversity']);
    }

    /* Set txantenna value */
    if (isset($wlcfg['txantenna'])) {
        $wl_sysctl[] = "txantenna=" . escapeshellarg($wlcfg['txantenna']);
    }

    /* Set rxantenna value */
    if (isset($wlcfg['rxantenna'])) {
        $wl_sysctl[] = "rxantenna=" . escapeshellarg($wlcfg['rxantenna']);
    }

    /* Set wireless hostap mode */
    if ($wlcfg['mode'] == "hostap") {
        $wlcmd[] = "mediaopt hostap";
    } else {
        $wlcmd[] = "-mediaopt hostap";
    }

    /* Set wireless adhoc mode */
    if ($wlcfg['mode'] == "adhoc") {
        $wlcmd[] = "mediaopt adhoc";
    } else {
        $wlcmd[] = "-mediaopt adhoc";
    }

    /* Not neccesary to set BSS mode as this is default if adhoc and/or hostap is NOT set */

    /* handle hide ssid option */
    if (isset($wlcfg['hidessid']['enable'])) {
        $wlcmd[] = "hidessid";
    } else {
        $wlcmd[] = "-hidessid";
    }

    /* handle pureg (802.11g) only option */
    if (isset($wlcfg['pureg']['enable'])) {
        $wlcmd[] = "mode 11g pureg";
    } else {
        $wlcmd[] = "-pureg";
    }

    /* handle puren (802.11n) only option */
    if (isset($wlcfg['puren']['enable'])) {
        $wlcmd[] = "puren";
    } else {
        $wlcmd[] = "-puren";
    }

    /* enable apbridge option */
    if (isset($wlcfg['apbridge']['enable'])) {
        $wlcmd[] = "apbridge";
    } else {
        $wlcmd[] = "-apbridge";
    }

    /* handle turbo option */
    if (isset($wlcfg['turbo']['enable'])) {
        $wlcmd[] = "mediaopt turbo";
    } else {
        $wlcmd[] = "-mediaopt turbo";
    }

    /* handle wme option */
    if (isset($wlcfg['wme']['enable'])) {
        $wlcmd[] = "wme";
    } else {
        $wlcmd[] = "-wme";
    }

    /* set up wep if enabled */
    $wepset = "";
    if (isset($wlcfg['wep']['enable']) && is_array($wlcfg['wep']['key'])) {
        switch($wlcfg['wpa']['auth_algs']) {
            case "1":
                $wepset .= "authmode open wepmode on ";
                break;
            case "2":
                $wepset .= "authmode shared wepmode on ";
                break;
            case "3":
                $wepset .= "authmode mixed wepmode on ";
        }
        $i = 1;
        foreach ($wlcfg['wep']['key'] as $wepkey) {
            $wepset .= "wepkey " . escapeshellarg("{$i}:{$wepkey['value']}") . " ";
            if (isset($wepkey['txkey'])) {
                $wlcmd[] = "weptxkey {$i} ";
            }
            $i++;
        }
        $wlcmd[] = $wepset;
    } else {
        $wlcmd[] = "authmode open wepmode off ";
    }

    kill_hostapd($if);
    mwexec(kill_wpasupplicant("{$if}"));

    /* generate wpa_supplicant/hostap config if wpa is enabled */
    switch ($wlcfg['mode']) {
        case 'bss':
            if (isset($wlcfg['wpa']['enable'])) {
                $wpa .= <<<EOD
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
ap_scan=1
#fast_reauth=1
network={
ssid="{$wlcfg['ssid']}"
scan_ssid=1
priority=5
key_mgmt={$wlcfg['wpa']['wpa_key_mgmt']}
psk="{$wlcfg['wpa']['passphrase']}"
pairwise={$wlcfg['wpa']['wpa_pairwise']}
group={$wlcfg['wpa']['wpa_pairwise']}
}
EOD;

                @file_put_contents("/var/etc/wpa_supplicant_{$if}.conf", $wpa);
                unset($wpa);
            }
            break;
        case 'hostap':
            if (!empty($wlcfg['wpa']['passphrase'])) {
                $wpa_passphrase = "wpa_passphrase={$wlcfg['wpa']['passphrase']}\n";
            } else {
                $wpa_passphrase = "";
            }
            if (isset($wlcfg['wpa']['enable'])) {
                $wpa .= <<<EOD
interface={$if}
driver=bsd
logger_syslog=-1
logger_syslog_level=0
logger_stdout=-1
logger_stdout_level=0
dump_file=/tmp/hostapd_{$if}.dump
ctrl_interface=/var/run/hostapd
ctrl_interface_group=wheel
#accept_mac_file=/tmp/hostapd_{$if}.accept
#deny_mac_file=/tmp/hostapd_{$if}.deny
#macaddr_acl={$wlcfg['wpa']['macaddr_acl']}
ssid={$wlcfg['ssid']}
debug={$wlcfg['wpa']['debug_mode']}
auth_algs={$wlcfg['wpa']['auth_algs']}
wpa={$wlcfg['wpa']['wpa_mode']}
wpa_key_mgmt={$wlcfg['wpa']['wpa_key_mgmt']}
wpa_pairwise={$wlcfg['wpa']['wpa_pairwise']}
wpa_group_rekey={$wlcfg['wpa']['wpa_group_rekey']}
wpa_gmk_rekey={$wlcfg['wpa']['wpa_gmk_rekey']}
wpa_strict_rekey={$wlcfg['wpa']['wpa_strict_rekey']}
{$wpa_passphrase}

EOD;

                if (isset($wlcfg['wpa']['rsn_preauth'])) {
                    $wpa .= <<<EOD
# Enable the next lines for preauth when roaming. Interface = wired or wireless interface talking to the AP you want to roam from/to
rsn_preauth=1
rsn_preauth_interfaces={$if}

EOD;
                }
                if (is_array($wlcfg['wpa']['ieee8021x']) && isset($wlcfg['wpa']['ieee8021x']['enable'])) {
                    $wpa .= "ieee8021x=1\n";

                    if (!empty($wlcfg['auth_server_addr']) && !empty($wlcfg['auth_server_shared_secret'])) {
                        $auth_server_port = "1812";
                        if (!empty($wlcfg['auth_server_port']) && is_numeric($wlcfg['auth_server_port'])) {
                            $auth_server_port = intval($wlcfg['auth_server_port']);
                        }
                        $wpa .= <<<EOD

auth_server_addr={$wlcfg['auth_server_addr']}
auth_server_port={$auth_server_port}
auth_server_shared_secret={$wlcfg['auth_server_shared_secret']}

EOD;
                        if (!empty($wlcfg['auth_server_addr2']) && !empty($wlcfg['auth_server_shared_secret2'])) {
                            $auth_server_port2 = "1812";
                            if (!empty($wlcfg['auth_server_port2']) && is_numeric($wlcfg['auth_server_port2'])) {
                                $auth_server_port2 = intval($wlcfg['auth_server_port2']);
                            }

                            $wpa .= <<<EOD
auth_server_addr={$wlcfg['auth_server_addr2']}
auth_server_port={$auth_server_port2}
auth_server_shared_secret={$wlcfg['auth_server_shared_secret2']}

EOD;
                        }
                    }
                }

                @file_put_contents("/var/etc/hostapd_{$if}.conf", $wpa);
                unset($wpa);
            }
            break;
    }

    /*
     *    all variables are set, lets start up everything
     */

    $baseif = interface_get_wireless_base($if);
    preg_match("/^(.*?)([0-9]*)$/", $baseif, $baseif_split);
    $wl_sysctl_prefix = 'dev.' . $baseif_split[1] . '.' . $baseif_split[2];

    /* set sysctls for the wireless interface */
    if (!empty($wl_sysctl)) {
        fwrite($fd_set, "# sysctls for {$baseif}\n");
        foreach ($wl_sysctl as $wl_sysctl_line) {
            fwrite($fd_set, "{$sysctl} {$wl_sysctl_prefix}.{$wl_sysctl_line}\n");
        }
    }

    if (isset($wlcfg['wpa']['enable'])) {
        if ($wlcfg['mode'] == "bss") {
            fwrite($fd_set, "{$wpa_supplicant} -B -i {$if} -c /var/etc/wpa_supplicant_{$if}.conf\n");
        }
        if ($wlcfg['mode'] == "hostap") {
            /* add line to script to restore old mac to make hostapd happy */
            if (file_exists("/tmp/{$if}_oldmac")) {
                $if_oldmac = file_get_contents("/tmp/{$if}_oldmac");
                if (is_macaddr($if_oldmac)) {
                    fwrite($fd_set, "{$ifconfig} " . escapeshellarg($if) .
                        " link " . escapeshellarg($if_oldmac) . "\n");
                }
            }

            fwrite($fd_set, "{$hostapd} -B -P /var/run/hostapd_{$if}.pid /var/etc/hostapd_{$if}.conf\n");

            /* add line to script to restore spoofed mac after running hostapd */
            if (file_exists("/tmp/{$if}_oldmac")) {
                if ($wl['spoofmac']) {
                    $if_curmac = $wl['spoofmac'];
                } else {
                    $if_curmac = get_interface_mac($if);
                }
                if (is_macaddr($if_curmac)) {
                    fwrite($fd_set, "{$ifconfig} " . escapeshellarg($if) .
                        " link " . escapeshellarg($if_curmac) . "\n");
                }
            }
        }
    }

    fclose($fd_set);

    /* Making sure regulatory settings have actually changed
   * before applying, because changing them requires bringing
   * down all wireless networks on the interface. */
    exec("{$ifconfig} " . escapeshellarg($if), $output);
    $ifconfig_str = implode($output);
    unset($output);
    $reg_changing = false;

    /* special case for the debug country code */
    if ($wlcfg['regcountry'] == 'DEBUG' && !preg_match("/\sregdomain\s+DEBUG\s/si", $ifconfig_str)) {
        $reg_changing = true;
    } elseif ($wlcfg['regdomain'] && !preg_match("/\sregdomain\s+{$wlcfg['regdomain']}\s/si", $ifconfig_str)) {
        $reg_changing = true;
    } elseif ($wlcfg['regcountry'] && !preg_match("/\scountry\s+{$wlcfg['regcountry']}\s/si", $ifconfig_str)) {
        $reg_changing = true;
    } elseif ($wlcfg['reglocation'] == 'anywhere' && preg_match("/\s(indoor|outdoor)\s/si", $ifconfig_str)) {
        $reg_changing = true;
    } elseif ($wlcfg['reglocation'] && $wlcfg['reglocation'] != 'anywhere' && !preg_match("/\s{$wlcfg['reglocation']}\s/si", $ifconfig_str)) {
        $reg_changing = true;
    }

    if ($reg_changing) {
        /* set regulatory domain */
        if ($wlcfg['regdomain']) {
            $wlregcmd[] = "regdomain " . escapeshellarg($wlcfg['regdomain']);
        }

        /* set country */
        if ($wlcfg['regcountry']) {
            $wlregcmd[] = "country " . escapeshellarg($wlcfg['regcountry']);
        }

        /* set location */
        if ($wlcfg['reglocation']) {
            $wlregcmd[] = escapeshellarg($wlcfg['reglocation']);
        }

        $wlregcmd_args = implode(" ", $wlregcmd);

        /* build a complete list of the wireless clones for this interface */
        $clone_list = array();
        if (does_interface_exist(interface_get_wireless_clone($baseif))) {
            $clone_list[] = interface_get_wireless_clone($baseif);
        }
        if (isset($config['wireless']['clone'])) {
            foreach ($config['wireless']['clone'] as $clone) {
                if ($clone['if'] == $baseif) {
                    $clone_list[] = $clone['cloneif'];
                }
            }
        }

        /* find which clones are up and bring them down */
        $ifup = legacy_interface_listget('up');
        $clones_up = array();
        foreach ($clone_list as $clone_if) {
            if (in_array($clone_if, $ifup)) {
                $clones_up[] = $clone_if;
                mwexec("{$ifconfig} " . escapeshellarg($clone_if) . " down");
            }
        }

        /* apply the regulatory settings */
        mwexec("{$ifconfig} " . escapeshellarg($if) . " {$wlregcmd_args}");

        /* bring the clones back up that were previously up */
        foreach ($clones_up as $clone_if) {
            mwexec("{$ifconfig} " . escapeshellarg($clone_if) . " up");

            /*
             * Rerun the setup script for the interface if it isn't this interface, the interface
             * is in infrastructure mode, and WPA is enabled.
             * This can be removed if wpa_supplicant stops dying when you bring the interface down.
             */
            if ($clone_if != $if) {
                $friendly_if = convert_real_interface_to_friendly_interface_name($clone_if);
                if (!empty($friendly_if)
                    && $config['interfaces'][$friendly_if]['wireless']['mode'] == "bss"
                    && isset($config['interfaces'][$friendly_if]['wireless']['wpa']['enable'])
                ) {
                    mwexec('/bin/sh /tmp/' . escapeshellarg($clone_if) . '_setup.sh');
                }
            }
        }
    }

    /* The mode must be specified in a separate command before ifconfig
     * will allow the mode and channel at the same time in the next. */
    mwexec("/sbin/ifconfig " . escapeshellarg($if) . " mode " . escapeshellarg($standard));

    /* configure wireless */
    $wlcmd_args = implode(" ", $wlcmd);
    mwexec("/sbin/ifconfig " . escapeshellarg($if) . " " . $wlcmd_args, false);
    unset($wlcmd_args, $wlcmd);

    /* configure txpower setting (it has been known to fail so run it separately) */
    if (!empty($wlcfg['txpower'])) {
        mwexecf('/sbin/ifconfig %s txpower %s', array($if, $wlcfg['txpower']));
    }

    sleep(1);
    /* execute hostapd and wpa_supplicant if required in shell */
    mwexec('/bin/sh /tmp/' . escapeshellarg($if) . '_setup.sh');

    return 0;
}

function kill_hostapd($interface)
{
    return killbypid("/var/run/hostapd_{$interface}.pid");
}

function kill_wpasupplicant($interface)
{
    return "/bin/pkill -f \"wpa_supplicant .*{$interface}\\.conf\"\n";
}

function find_dhclient_process($interface)
{
    if ($interface) {
        $pid = `/bin/pgrep -axf "dhclient: {$interface}"`;
    } else {
        $pid = 0;
    }

    return intval($pid);
}

function kill_dhclient_process($interface)
{
    if (empty($interface) || !does_interface_exist($interface)) {
        return;
    }

    killbypid(find_dhclient_process($interface), 'TERM', true);
}

function interface_vlan_mtu_configured($realhwif, $mtu)
{
    global $config;

    if (isset($config['vlans']['vlan'])) {
        foreach ($config['vlans']['vlan'] as $vlan) {
            if ($vlan['if'] != $realhwif) {
                continue;
            }
            $assignedport = convert_real_interface_to_friendly_interface_name($vlan['vlanif']);
            if (!empty($assignedport) && !empty($config['interfaces'][$assignedport]['mtu'])) {
                if (intval($config['interfaces'][$assignedport]['mtu']) > $mtu) {
                    $mtu = $portmtu;
                }
            }
        }
    }

    return $mtu;
}

function interface_virtual_create($interface)
{
    global $config;

    if (strstr($interface, '_vlan')) {
        interfaces_vlan_configure($vlan);
    } elseif (substr($interface, 0, 3) == 'gre') {
        interfaces_gre_configure(0, false, $interface);
    } elseif (substr($interface, 0, 3) == 'gif') {
        interfaces_gif_configure(0, false, $interface);
    } elseif (substr($interface, 0, 4) == 'ovpn') {
        /* XXX this looks like a plugin spot... */
        openvpn_configure_interface($interface);
    } elseif (substr($interface, 0, 4) == 'lagg') {
        interfaces_lagg_configure($interface);
    } elseif (substr($interface, 0, 6) == 'bridge') {
        interfaces_bridge_configure(0, $interface);
    }
}

function interface_vlan_adapt_mtu($vlanifs, $mtu)
{
    global $config;

    if (!is_array($vlanifs)) {
        return;
    }

    /* All vlans need to use the same mtu value as their parent. */
    foreach ($vlanifs as $vlan) {
        $assignedport = convert_real_interface_to_friendly_interface_name($vlan['vlanif']);
        if (!empty($assignedport)) {
            if (!empty($config['interfaces'][$assignedport]['mtu'])) {
                /*
                 * XXX: This is really never going to happen just keep the code for safety and readbility.
                 * It never happens since interface_vlan_mtu_configured finds the biggest mtu on vlans.
                 * Also if it has a lower mtu configured just respect user choice.
                 */
                if (intval($config['interfaces'][$assignedport]['mtu']) > $mtu) {
                    legacy_interface_mtu($vlan['vlanif'], $mtu);
                }
            } else {
                if (legacy_interface_stats($vlan['vlanif'])['mtu'] != $mtu) {
                    legacy_interface_mtu($vlan['vlanif'], $mtu);
                }
            }
        } elseif (legacy_interface_stats($vlan['vlanif'])['mtu'] != $mtu) {
            legacy_interface_mtu($vlan['vlanif'], $mtu);
        }
    }
}

function interface_configure($interface = 'wan', $reloadall = false, $linkupevent = false, $verbose = false)
{
    global $config;

    $wancfg = $config['interfaces'][$interface];

    if (!isset($wancfg['enable'])) {
        return;
    }

    $wandescr = !empty($wancfg['descr']) ? strtoupper($wancfg['descr']) : strtoupper($interface);

    if ($verbose) {
        echo sprintf('Configuring %s interface...', $wandescr);
        flush();
    }

    $realif = get_real_interface($interface);
    $realhwif_array = get_parent_interface($interface);
    // Need code to handle MLPPP if we ever use $realhwif for MLPPP handling
    $realhwif = $realhwif_array[0];

    if (!file_exists("/var/run/booting") && !(substr($realif, 0, 4) == "ovpn")) {
        /* remove all IPv4 and IPv6 addresses */
        $tmpifaces = legacy_getall_interface_addresses($realif);
        foreach ($tmpifaces as $tmpiface) {
            if (is_ipaddrv6($tmpiface) || is_subnetv6($tmpiface)) {
                if (!is_linklocal($tmpiface)) {
                    mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$tmpiface} delete");
                }
            } else {
                if (is_subnetv4($tmpiface)) {
                    $tmpip = explode('/', $tmpiface);
                    $tmpip = $tmpip[0];
                } else {
                    $tmpip = $tmpiface;
                }
                legacy_interface_deladdress($realif, $tmpip);
            }
        }

        /* only bring down the interface when both v4 and v6 are set to NONE */
        if (empty($wancfg['ipaddr']) && empty($wancfg['ipaddrv6'])) {
            interface_bring_down($interface);
        }
    }

    $interface_to_check = $realif;
    switch ($wancfg['ipaddr']) {
        case 'pppoe':
        case 'l2tp':
        case 'pptp':
        case 'ppp':
            $interface_to_check = $realhwif;
            break;
    }

    /* Need to check that the interface exists or not in the case where its coming back from disabled state see #3270 */
    if (in_array(substr($realif, 0, 3), array("gre", "gif")) || !does_interface_exist($interface_to_check)) {
        interface_virtual_create($interface_to_check);
    }

    /* Disable Accepting router advertisements unless specifically requested */
    mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 -accept_rtadv");

    /* wireless configuration? */
    if (isset($wancfg['wireless']) && is_array($wancfg['wireless'])) {
        interface_wireless_configure($realif, $wancfg, $wancfg['wireless']);
    }

    $mac = get_interface_mac($realhwif);
    /*
     * Don't try to reapply the spoofed MAC if it's already applied.
     * When ifconfig link is used, it cycles the interface down/up, which triggers
     * the interface config again, which attempts to spoof the MAC again,
     * which cycles the link again...
     */
    if (!empty($wancfg['spoofmac']) && ($wancfg['spoofmac'] != $mac)) {
        mwexec("/sbin/ifconfig " . escapeshellarg($realhwif) .
            " link " . escapeshellarg($wancfg['spoofmac']));

        /* All vlans need to spoof their parent mac address, too. */
        if (isset($config['vlans']['vlan'])) {
            foreach ($config['vlans']['vlan'] as $vlan) {
                if ($vlan['if'] == $realhwif) {
                    mwexec("/sbin/ifconfig " . escapeshellarg($vlan['vlanif']) .
                        " link " . escapeshellarg($wancfg['spoofmac']));
                }
            }
        }
    }

    /* media */
    if (!empty($wancfg['media']) || !empty($wancfg['mediaopt'])) {
        $cmd = "/sbin/ifconfig " . escapeshellarg($realhwif);
        if (!empty($wancfg['media'])) {
            $cmd .= " media " . escapeshellarg($wancfg['media']);
        }
        if (!empty($wancfg['mediaopt'])) {
            $cmd .= " mediaopt " . escapeshellarg($wancfg['mediaopt']);
        }
        mwexec($cmd);
    }
    // apply interface hardware settings (tso, lro, ..)
    configure_interface_hardware($realhwif);

    $tunnelif = substr($realif, 0, 3);
    switch ($wancfg['ipaddr']) {
        case 'dhcp':
            interface_dhcp_configure($interface);
            break;
        case 'pppoe':
        case 'l2tp':
        case 'pptp':
        case 'ppp':
            interface_ppps_configure($interface);
            break;
        default:
            /* XXX: Kludge for now related to #3280 */
            if (!in_array($tunnelif, array("gif", "gre", "ovp"))) {
                if (is_ipaddrv4($wancfg['ipaddr']) && $wancfg['subnet'] <> "") {
                    legacy_interface_setaddress($realif, "{$wancfg['ipaddr']}/{$wancfg['subnet']}");
                }
            }
            break;
    }

    if (isset($wancfg['ipaddrv6'])) {
        switch ($wancfg['ipaddrv6']) {
            case 'slaac':
            case 'dhcp6':
                interface_dhcpv6_configure($interface, $wancfg);
                break;
            case '6rd':
                interface_6rd_configure($interface, $wancfg);
                break;
            case '6to4':
                interface_6to4_configure($interface, $wancfg);
                break;
            case 'track6':
                interface_track6_configure($interface, $wancfg, $linkupevent);
                break;
            default:
                /* XXX: Kludge for now related to #3280 */
                if (!in_array($tunnelif, array("gif", "gre", "ovp"))) {
                    if (is_ipaddrv6($wancfg['ipaddrv6']) && $wancfg['subnetv6'] <> "") {
                        mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$wancfg['ipaddrv6']} prefixlen " . escapeshellarg($wancfg['subnetv6']));
                    }
                }
                break;
        }
    }
    if (!empty($wancfg['mtu'])) {
        if (stristr($realif, "_vlan")) {
            $assignedparent = convert_real_interface_to_friendly_interface_name($realhwif);
            if (!empty($assignedparent) && !empty($config['interfaces'][$assignedparent]['mtu'])) {
                $parentmtu = $config['interfaces'][$assignedparent]['mtu'];
            } else {
                $parentmtu = interface_vlan_mtu_configured($realhwif, $wancfg['mtu']);
            }

            if ($wancfg['mtu'] > $parentmtu) {
                if (legacy_interface_stats($realhwif)['mtu'] != $wancfg['mtu']) {
                    legacy_interface_mtu($realhwif, $wancfg['mtu']);
                }

                /* All vlans need to use the same mtu value as their parent. */
                interface_vlan_adapt_mtu(link_interface_to_vlans($realhwif), $wancfg['mtu']);
            } else {
                legacy_interface_mtu($realif, $wancfg['mtu']);
            }
        } else {
            if ($wancfg['mtu'] != legacy_interface_stats($realhwif)['mtu']) {
                legacy_interface_mtu($realhwif, $wancfg['mtu']);
            }

            /* This case is needed when the parent of vlans is being configured */
            interface_vlan_adapt_mtu(link_interface_to_vlans($realif), $wancfg['mtu']);
        }
        /* XXX: What about gre/gif/lagg/.. ? */
    }

    if (does_interface_exist($wancfg['if'])) {
        interfaces_bring_up($wancfg['if']);
    }

    if (!file_exists("/var/run/booting")) {
        link_interface_to_vips($interface, "update");

        unset($gre);
        $gre = link_interface_to_gre($interface);
        if (!empty($gre)) {
            array_walk($gre, 'interface_gre_configure');
        }

        unset($gif);
        $gif = link_interface_to_gif($interface);
        if (!empty($gif)) {
            array_walk($gif, 'interface_gif_configure');
        }

        if ($linkupevent == false || substr($realif, 0, 4) == "ovpn") {
            unset($bridgetmp);
            $bridgetmp = link_interface_to_bridge($interface);
            if (!empty($bridgetmp)) {
                interface_bridge_add_member($bridgetmp, $realif);
            }
        }

        $grouptmp = link_interface_to_group($interface);
        if (!empty($grouptmp)) {
            array_walk($grouptmp, 'interface_group_add_member');
        }

        if ($interface == 'lan') {
            /* make new hosts file */
            system_hosts_generate();
        }

        if ($reloadall == true) {
            system_routing_configure($interface);
            ipsec_configure_do();
            plugins_configure('dns');
            services_dhcpd_configure();
            configd_run("dyndns reload {$interface}");
            configd_run("rfc2136 reload {$interface}");
        }
    }

    interfaces_staticarp_configure($interface);

    if ($verbose) {
        echo "done.\n";
    }

    return 0;
}

function interface_track6_configure($interface = 'lan', $wancfg, $linkupevent = false)
{
    global $config;

    if (!is_array($wancfg)) {
        return;
    }

    if (!isset($wancfg['enable'])) {
        return;
    }

    /* If the interface is not configured via another, exit */
    if (empty($wancfg['track6-interface'])) {
        return;
    }

    /* always configure a link-local of fe80::1:1 on the track6 interfaces */
    $realif = get_real_interface($interface);
    $linklocal = find_interface_ipv6_ll($realif);
    if (!empty($linklocal)) {
        mwexec("/sbin/ifconfig {$realif} inet6 {$linklocal} delete");
    }
    /* XXX: This might break for good on a carp installation using link-local as network ips */
    /* XXX: Probably should remove? */
    mwexec("/sbin/ifconfig {$realif} inet6 fe80::1:1%{$realif}");

    $trackcfg = $config['interfaces'][$wancfg['track6-interface']];
    if (!isset($trackcfg['enable'])) {
        log_error("Interface {$interface} tracking non-existent interface {$wancfg['track6-interface']}");
        return;
    }

    switch($trackcfg['ipaddrv6']) {
        case "6to4":
            interface_track6_6to4_configure($interface, $wancfg);
            break;
        case "6rd":
            interface_track6_6rd_configure($interface, $wancfg);
            break;
        case "dhcp6":
            if ($linkupevent == true) {
                /*
                 * NOTE: Usually come here from rc.linkup calling so just call directly intead of generating event
                 *  Instead of disrupting all other v4 configuration just restart DHCPv6 client for now
                 *
                 * XXX: Probably DHCPv6 client should handle this autmagically itself?
                 */
                $parentrealif = get_real_interface($wancfg['track6-interface']);
                killbypid("/var/run/dhcp6c_{$parentrealif}.pid", 'HUP');
            }
            break;
    }

    if (!file_exists("/var/run/booting") && $linkupevent == false) {
        services_dhcpd_configure("inet6");
    }

    return 0;
}

function interface_track6_6rd_configure($interface = 'lan', $lancfg)
{
    global $config;

    /* If the interface is not configured via another, exit */
    if (empty($lancfg['track6-interface'])) {
        return;
    }

    $wancfg = $config['interfaces'][$lancfg['track6-interface']];
    if (empty($wancfg)) {
        log_error("Interface {$interface} tracking non-existent interface {$lancfg['track6-interface']}");
        return;
    }

    $ip4address = get_interface_ip($lancfg['track6-interface']);
    if (!is_ipaddrv4($ip4address)) { /* XXX: This should not be needed by 6rd || (is_private_ip($ip4address))) { */
        log_error("The interface IPv4 '{$ip4address}' address on interface '{$lancfg['track6-interface']}' is not public, not configuring 6RD tunnel");
        return;
    }
    $hexwanv4 = return_hex_ipv4($ip4address);

    /* create the long prefix notation for math, save the prefix length */
    $rd6prefix = explode("/", $wancfg['prefix-6rd']);
    $rd6prefixlen = $rd6prefix[1];
    $rd6prefix = Net_IPv6::uncompress($rd6prefix[0]);

    /* binary presentation of the prefix for all 128 bits. */
    $rd6lanbin = convert_ipv6_to_128bit($rd6prefix);

    /* just save the left prefix length bits */
    $rd6lanbin = substr($rd6lanbin, 0, $rd6prefixlen);
    /* add the v4 address, offset n bits from the left */
    $rd6lanbin .= substr(sprintf("%032b", hexdec($hexwanv4)), (0 + $wancfg['prefix-6rd-v4plen']), 32);

    /* add the custom prefix id, max 32bits long? (64 bits - (prefixlen + (32 - v4plen)) */
    /* 64 - (37 + (32 - 17)) = 8 == /52 */
    $restbits = 64 - ($rd6prefixlen + (32 - $wancfg['prefix-6rd-v4plen']));
    // echo "64 - (prefixlen {$rd6prefixlen} + v4len (32 - {$wancfg['prefix-6rd-v4plen']})) = {$restbits} \n";
    $rd6lanbin .= substr(sprintf("%032b", str_pad($lancfg['track6-prefix-id'], 32, "0", STR_PAD_LEFT)), (32 - $restbits), 32);
    /* fill the rest out with zeros */
    $rd6lanbin = str_pad($rd6lanbin, 128, "0", STR_PAD_RIGHT);

    /* convert the 128 bits for the lan address back into a valid IPv6 address */
    $rd6lan = convert_128bit_to_ipv6($rd6lanbin) ."1";

    $lanif = get_real_interface($interface);
    $oip = find_interface_ipv6($lanif);
    if (is_ipaddrv6($oip)) {
        mwexec("/sbin/ifconfig {$lanif} inet6 {$oip} delete");
    }
    log_error("rd6 {$interface} with ipv6 address {$rd6lan} based on {$lancfg['track6-interface']} ipv4 {$ip4address}");
    mwexec("/sbin/ifconfig {$lanif} inet6 {$rd6lan} prefixlen 64");

    return 0;
}

function interface_track6_6to4_configure($interface = 'lan', $lancfg)
{
    global $config;

    /* If the interface is not configured via another, exit */
    if (empty($lancfg['track6-interface'])) {
        return;
    }

    $wancfg = $config['interfaces'][$lancfg['track6-interface']];
    if (empty($wancfg)) {
        log_error("Interface {$interface} tracking non-existent interface {$lancfg['track6-interface']}");
        return;
    }

    $ip4address = get_interface_ip($lancfg['track6-interface']);
    if (!is_ipaddrv4($ip4address) || is_private_ip($ip4address)) {
        log_error("The interface IPv4 '{$ip4address}' address on interface '{$lancfg['track6-interface']}' is not public, not configuring 6RD tunnel");
        return;
    }
    $hexwanv4 = return_hex_ipv4($ip4address);

    /* create the long prefix notation for math, save the prefix length */
    $sixto4prefix = "2002::";
    $sixto4prefixlen = 16;
    $sixto4prefix = Net_IPv6::uncompress($sixto4prefix);

    /* binary presentation of the prefix for all 128 bits. */
    $sixto4lanbin = convert_ipv6_to_128bit($sixto4prefix);

    /* just save the left prefix length bits */
    $sixto4lanbin = substr($sixto4lanbin, 0, $sixto4prefixlen);
    /* add the v4 address */
    $sixto4lanbin .= sprintf("%032b", hexdec($hexwanv4));
    /* add the custom prefix id */
    $sixto4lanbin .= sprintf("%016b", $lancfg['track6-prefix-id']);
    /* fill the rest out with zeros */
    $sixto4lanbin = str_pad($sixto4lanbin, 128, "0", STR_PAD_RIGHT);

    /* convert the 128 bits for the lan address back into a valid IPv6 address */
    $sixto4lan = convert_128bit_to_ipv6($sixto4lanbin) ."1";

    $lanif = get_real_interface($interface);
    $oip = find_interface_ipv6($lanif);
    if (is_ipaddrv6($oip)) {
        mwexec("/sbin/ifconfig {$lanif} inet6 {$oip} delete");
    }
    log_error("sixto4 {$interface} with ipv6 address {$sixto4lan} based on {$lancfg['track6-interface']} ipv4 {$ip4address}");
    mwexec("/sbin/ifconfig {$lanif} inet6 {$sixto4lan} prefixlen 64");

    return 0;
}

function interface_6rd_configure($interface = "wan", $wancfg)
{
    global $config;

    /* because this is a tunnel interface we can only function
     *  with a public IPv4 address on the interface */
    if (!is_array($wancfg)) {
        return;
    }

    $wanif = get_real_interface($interface);
    $ip4address = find_interface_ip($wanif);
    if ((!is_ipaddrv4($ip4address)) || (is_private_ip($ip4address))) {
        log_error("The interface IPv4 '{$ip4address}' address on interface '{$wanif}' is not public, not configuring 6RD tunnel");
        return false;
    }
    $hexwanv4 = return_hex_ipv4($ip4address);

    if (!is_numeric($wancfg['prefix-6rd-v4plen'])) {
        $wancfg['prefix-6rd-v4plen'] = 0;
    }

    /* create the long prefix notation for math, save the prefix length */
    $rd6prefix = explode("/", $wancfg['prefix-6rd']);
    $rd6prefixlen = $rd6prefix[1];
    $rd6prefix = Net_IPv6::uncompress($rd6prefix[0]);

    /* binary presentation of the prefix for all 128 bits. */
    $rd6prefixbin = convert_ipv6_to_128bit($rd6prefix);

    /* just save the left prefix length bits */
    $rd6prefixbin = substr($rd6prefixbin, 0, $rd6prefixlen);
    /* if the prefix length is not 32 bits we need to shave bits off from the left of the v4 address. */
    $rd6prefixbin .= substr(sprintf("%032b", hexdec($hexwanv4)), $wancfg['prefix-6rd-v4plen'], 32);
    /* fill out the rest with 0's */
    $rd6prefixbin = str_pad($rd6prefixbin, 128, "0", STR_PAD_RIGHT);

    /* convert the 128 bits for the broker address back into a valid IPv6 address */
    $rd6prefix = convert_128bit_to_ipv6($rd6prefixbin);

    $rd6brgw = "{$rd6prefix}{$wancfg['gateway-6rd']}";

    /* XXX: need to extend to support variable prefix size for v4 */
    $stfiface = "{$interface}_stf";
    if (does_interface_exist($stfiface)) {
        legacy_interface_destroy($stfiface);
    }
    $tmpstfiface = legacy_interface_create('stf');
    legacy_interface_rename($tmpstfiface, $stfiface);
    legacy_interface_flags($stfiface, 'link2');
    if ($wancfg['prefix-6rd-v4plen'] > 0) {
        $rd6prefixlen += intval($wancfg['prefix-6rd-v4plen']);
    } else {
        $rd6prefixlen += 32;
    }
    mwexec("/sbin/ifconfig {$stfiface} inet6 {$rd6prefix}/{$rd6prefixlen}");
    mwexec("/sbin/ifconfig {$stfiface} stfv4br " . escapeshellarg($wancfg['gateway-6rd']));
    if ($wancfg['prefix-6rd-v4plen'] > 0 && $wancfg['prefix-6rd-v4plen'] < 32) {
        mwexec("/sbin/ifconfig {$stfiface} stfv4net {$ip4address}/{$wancfg['prefix-6rd-v4plen']}");
    }

    /* write out a default router file */
    file_put_contents("/tmp/{$wanif}_routerv6", "{$rd6brgw}\n");
    file_put_contents("/tmp/{$wanif}_defaultgwv6", "{$rd6brgw}\n");

    $ip4gateway = get_interface_gateway($interface);
    if (is_ipaddrv4($ip4gateway)) {
        mwexec("/sbin/route delete -host " . escapeshellarg($wancfg['gateway-6rd']));
        mwexec("/sbin/route add -host " . escapeshellarg($wancfg['gateway-6rd']) . " {$ip4gateway}");
    }
    /* configure dependent interfaces */
    if (!file_exists("/var/run/booting")) {
        link_interface_to_track6($interface, "update");
    }

    return 0;
}

function interface_6to4_configure($interface = 'wan', $wancfg)
{
    global $config;

    /* because this is a tunnel interface we can only function
     *  with a public IPv4 address on the interface */

    if (!is_array($wancfg)) {
        return;
    }

    $wanif = get_real_interface($interface);
    $ip4address = find_interface_ip($wanif);
    if ((!is_ipaddrv4($ip4address)) || (is_private_ip($ip4address))) {
        log_error("The interface IPv4 '{$ip4address}' address on interface '{$wanif}' is not public, not configuring 6RD tunnel");
        return false;
    }

    /* create the long prefix notation for math, save the prefix length */
    $stfprefixlen = 16;
    $stfprefix = Net_IPv6::uncompress("2002::");
    $stfarr = explode(":", $stfprefix);
    $v4prefixlen = "0";

    /* we need the hex form of the interface IPv4 address */
    $ip4arr = explode(".", $ip4address);
    $hexwanv4 = "";
    foreach ($ip4arr as $octet) {
        $hexwanv4 .= sprintf("%02x", $octet);
    }

    /* we need the hex form of the broker IPv4 address */
    $ip4arr = explode(".", "192.88.99.1");
    $hexbrv4 = "";
    foreach ($ip4arr as $octet) {
        $hexbrv4 .= sprintf("%02x", $octet);
    }

    /* binary presentation of the prefix for all 128 bits. */
    $stfprefixbin = "";
    foreach ($stfarr as $element) {
        $stfprefixbin .= sprintf("%016b", hexdec($element));
    }
    /* just save the left prefix length bits */
    $stfprefixstartbin = substr($stfprefixbin, 0, $stfprefixlen);

    /* if the prefix length is not 32 bits we need to shave bits off from the left of the v4 address. */
    $stfbrokerbin = substr(sprintf("%032b", hexdec($hexbrv4)), $v4prefixlen, 32);
    $stfbrokerbin = str_pad($stfprefixstartbin . $stfbrokerbin, 128, "0", STR_PAD_RIGHT);

    /* for the local subnet too. */
    $stflanbin = substr(sprintf("%032b", hexdec($hexwanv4)), $v4prefixlen, 32);
    $stflanbin = str_pad($stfprefixstartbin . $stflanbin, 128, "0", STR_PAD_RIGHT);

    /* convert the 128 bits for the broker address back into a valid IPv6 address */
    $stfbrarr = array();
    $stfbrbinarr = array();
    $stfbrbinarr = str_split($stfbrokerbin, 16);
    foreach ($stfbrbinarr as $bin) {
        $stfbrarr[] = dechex(bindec($bin));
    }
    $stfbrgw = Net_IPv6::compress(implode(":", $stfbrarr));

    /* convert the 128 bits for the broker address back into a valid IPv6 address */
    $stflanarr = array();
    $stflanbinarr = array();
    $stflanbinarr = str_split($stflanbin, 16);
    foreach ($stflanbinarr as $bin) {
        $stflanarr[] = dechex(bindec($bin));
    }
    $stflanpr = Net_IPv6::compress(implode(":", $stflanarr));
    $stflanarr[7] = 1;
    $stflan = Net_IPv6::compress(implode(":", $stflanarr));

    $stfiface = "{$interface}_stf";
    if (does_interface_exist($stfiface)) {
        legacy_interface_destroy($stfiface);
    }
    $tmpstfiface = legacy_interface_create('stf');
    legacy_interface_rename($tmpstfiface, $stfiface);
    legacy_interface_flags($stfiface, 'link2');
    mwexec("/sbin/ifconfig {$stfiface} inet6 {$stflanpr} prefixlen 16");

    /* write out a default router file */
    file_put_contents("/tmp/{$wanif}_routerv6", "{$stfbrgw}");
    file_put_contents("/tmp/{$wanif}_defaultgwv6", "{$stfbrgw}");

    $ip4gateway = get_interface_gateway($interface);
    if (is_ipaddrv4($ip4gateway)) {
        mwexec("/sbin/route delete -host 192.88.99.1");
        mwexec("/sbin/route add -host 192.88.99.1 {$ip4gateway}");
    }

    if (!file_exists("/var/run/booting")) {
        link_interface_to_track6($interface, "update");
    }

    return 0;
}

function interface_dhcpv6_configure($interface = 'wan', $wancfg)
{
    global $config;

    if (!is_array($wancfg)) {
        return;
    }

    $wanif = get_real_interface($interface, "inet6");
    $dhcp6cconf = "";
    $dhcp6cconf .= "interface {$wanif} {\n";

    /* for SLAAC interfaces we do fire off a dhcp6 client for just our name servers */
    if ($wancfg['ipaddrv6'] == "slaac") {
        $dhcp6cconf .= "  information-only;\n";
        $dhcp6cconf .= "  request domain-name-servers;\n";
        $dhcp6cconf .= "  request domain-name;\n";
        $dhcp6cconf .= "  script \"/var/etc/dhcp6c_{$interface}_script.sh\"; # we'd like some nameservers please\n";
        $dhcp6cconf .= "};\n";
    } else {
        /* skip address request if this is set */
        if (!isset($wancfg['dhcp6prefixonly'])) {
            $dhcp6cconf .= "  send ia-na 0;   # request stateful address\n";
        }
        if (is_numeric($wancfg['dhcp6-ia-pd-len'])) {
            $dhcp6cconf .= "  send ia-pd 0;  # request prefix delegation\n";
        }

        $dhcp6cconf .= "\trequest domain-name-servers;\n";
        $dhcp6cconf .= "\trequest domain-name;\n";
        $dhcp6cconf .= "\tscript \"/var/etc/dhcp6c_{$interface}_script.sh\"; # we'd like some nameservers please\n";

        $dhcp6cconf .= "};\n";

        if (!isset($wancfg['dhcp6prefixonly'])) {
            $dhcp6cconf .= "id-assoc na 0 { };\n";
        }

        if (is_numeric($wancfg['dhcp6-ia-pd-len'])) {
            /* Setup the prefix delegation */
            $dhcp6cconf .= "id-assoc pd 0 {\n";
            $preflen = 64 - $wancfg['dhcp6-ia-pd-len'];
            if (isset($wancfg['dhcp6-ia-pd-send-hint'])) {
                $dhcp6cconf .= "  prefix ::/{$preflen} infinity;\n";
            }
            $iflist = link_interface_to_track6($interface);
            foreach ($iflist as $friendly => $ifcfg) {
                if (is_numeric($ifcfg['track6-prefix-id'])) {
                    $realif = get_real_interface($friendly);
                    $dhcp6cconf .= "  prefix-interface {$realif} {\n";
                    $dhcp6cconf .= "    sla-id {$ifcfg['track6-prefix-id']};\n";
                    $dhcp6cconf .= "    sla-len {$wancfg['dhcp6-ia-pd-len']};\n";
                    $dhcp6cconf .= "  };\n";
                }
            }
            unset($preflen, $iflist, $ifcfg);
            $dhcp6cconf .= "};\n";
        }
    }

    // DHCP6 Config File Advanced
    if ($wancfg['adv_dhcp6_config_advanced']) {
        $dhcp6cconf = DHCP6_Config_File_Advanced($interface, $wancfg, $wanif);
    }

    // DHCP6 Config File Override
    if (!empty($wancfg['adv_dhcp6_config_file_override'])) {
        $dhcp6cfile = $wancfg['adv_dhcp6_config_file_override_path'];
        if (file_exists($dhcp6cfile)) {
            $dhcp6cconf = file_get_contents($dhcp6cfile);
            $dhcp6cconf = DHCP6_Config_File_Substitutions($wancfg, $wanif, $dhcp6cconf);
        } else {
            log_error(sprintf('DHCP6 config file override does not exist: "%s"', $dhcp6cfile));
        }
    }

    /* wide-dhcp6c works for now. */
    if (!@file_put_contents("/var/etc/dhcp6c_{$interface}.conf", $dhcp6cconf)) {
        printf("Error: cannot open dhcp6c_{$interface}.conf in interface_dhcpv6_configure() for writing.\n");
        unset($dhcp6cconf);
        return 1;
    }
    unset($dhcp6cconf);

    $dhcp6cscript = "#!/bin/sh\n";
    $dhcp6cscript .= "# This shell script launches /usr/local/etc/rc.newwanipv6 with a interface argument.\n";
    $dhcp6cscript .= "/usr/local/etc/rc.newwanipv6 {$wanif} \n";

    if (!@file_put_contents("/var/etc/dhcp6c_{$interface}_script.sh", $dhcp6cscript)) {
        printf("Error: cannot open dhcp6c_{$interface}_script.sh in interface_dhcpv6_configure() for writing.\n");
        unset($dhcp6cscript);
        return 1;
    }
    unset($dhcp6cscript);
    chmod("/var/etc/dhcp6c_{$interface}_script.sh", 0755);

    $dhcp6ccommand = exec_safe(
        "/usr/local/sbin/dhcp6c %s -c %s -p %s %s",
        array(
            empty($wancfg['adv_dhcp6_debug']) ? '-d' : '-D',
            "/var/etc/dhcp6c_{$interface}.conf",
            "/var/run/dhcp6c_{$wanif}.pid",
            "{$wanif}"
        )
    );

    $rtsoldscript = "#!/bin/sh\n";
    $rtsoldscript .= "# This shell script launches dhcp6c and configured gateways for this interface.\n";
    $rtsoldscript .= "echo $2 > /tmp/{$wanif}_routerv6\n";
    $rtsoldscript .= "echo $2 > /tmp/{$wanif}_defaultgwv6\n";
    $rtsoldscript .= "if [ -f /var/run/dhcp6c_{$wanif}.pid ]; then\n";
    $rtsoldscript .= "\t/bin/pkill -F /var/run/dhcp6c_{$wanif}.pid\n";
    $rtsoldscript .= "\t/bin/sleep 1\n";
    $rtsoldscript .= "fi\n";
    $rtsoldscript .= "/usr/bin/logger -t rtsold \"Starting dhcp6 client for interface {$interface}({$wanif})\"\n";
    $rtsoldscript .= "$dhcp6ccommand\n";

    if (!@file_put_contents("/var/etc/rtsold_{$wanif}_script.sh", $rtsoldscript)) {
        printf("Error: cannot open rtsold_{$wanif}_script.sh in interface_dhcpv6_configure() for writing.\n");
        unset($rtsoldscript);
        return 1;
    }
    unset($rtsoldscript);
    chmod("/var/etc/rtsold_{$wanif}_script.sh", 0755);

    /* accept router advertisements for this interface */
    set_single_sysctl("net.inet6.ip6.accept_rtadv", "1");
    log_error("Accept router advertisements on interface {$wanif} ");
    mwexec("/sbin/ifconfig {$wanif} inet6 accept_rtadv -ifdisabled");

    /* Enable RFC6204w support for IPv6 Customer Edge (CE) router */
    set_single_sysctl("net.inet6.ip6.rfc6204w3", "1");

    /* always kill rtsold in case of reconfigure */
    killbypid("/var/run/rtsold_{$wanif}.pid", 'TERM', true);

    if (isset($wancfg['dhcp6sendsolicit'])) {
        /* dhcp6c from previous run can still be around */
        killbypid("/var/run/dhcp6c_{$wanif}.pid", 'TERM', true);
        /* command is already exec_safe() */
        mwexec($dhcp6ccommand);
    } else {
        /* fire up rtsold for IPv6 RAs first, this backgrounds immediately. It will call dhcp6c */
        mwexecf(
            '/usr/sbin/rtsold -p %s -O %s -R %s %s %s',
            array(
                "/var/run/rtsold_{$wanif}.pid",
                "/var/etc/rtsold_{$wanif}_script.sh",
                '/usr/bin/true', /* XXX missing proper script to refresh resolv.conf */
                empty($wancfg['adv_dhcp6_debug']) ? '-d' : '-D',
                $wanif
            )
        );
    }

    return 0;
}

function DHCP6_Config_File_Advanced($interface, $wancfg, $wanif)
{
    $send_options = "";
    if ($wancfg['adv_dhcp6_interface_statement_send_options'] != '') {
        $options = preg_split('/\s*,\s*(?=(?:[^"]*"[^"]*")*[^"]*$)/', $wancfg['adv_dhcp6_interface_statement_send_options']);
        foreach ($options as $option) {
            $send_options .= "\tsend " . $option . ";\n";
        }
    }

    $request_options = "";
    if ($wancfg['adv_dhcp6_interface_statement_request_options'] != '') {
        $options = preg_split('/\s*,\s*(?=(?:[^"]*"[^"]*")*[^"]*$)/', $wancfg['adv_dhcp6_interface_statement_request_options']);
        foreach ($options as $option) {
            $request_options .= "\trequest " . $option . ";\n";
        }
    }

    $information_only = "";
    if ($wancfg['adv_dhcp6_interface_statement_information_only_enable'] != '') {
        $information_only = "\tinformation-only;\n";
    }

    $script = "\tscript \"/var/etc/dhcp6c_{$interface}_script.sh\";\n";
    if ($wancfg['adv_dhcp6_interface_statement_script'] != '') {
        $script = "\tscript \"{$wancfg['adv_dhcp6_interface_statement_script']}\";\n";
    }

    $interface_statement  = "interface";
    $interface_statement .= " {$wanif}";
    $interface_statement .= " {\n";
    $interface_statement .= "$send_options";
    $interface_statement .= "$request_options";
    $interface_statement .= "$information_only";
    $interface_statement .= "$script";
    $interface_statement .= "};\n";

    $id_assoc_statement_address = "";
    if ($wancfg['adv_dhcp6_id_assoc_statement_address_enable'] != '') {
        $id_assoc_statement_address .= "id-assoc";
        $id_assoc_statement_address .= " na";
        if (is_numeric($wancfg['adv_dhcp6_id_assoc_statement_address_id'])) {
            $id_assoc_statement_address .= " {$wancfg['adv_dhcp6_id_assoc_statement_address_id']}";
        }
        $id_assoc_statement_address .= " { ";

        if (($wancfg['adv_dhcp6_id_assoc_statement_address'] != '') &&
            (is_numeric($wancfg['adv_dhcp6_id_assoc_statement_address_pltime']) ||
                $wancfg['adv_dhcp6_id_assoc_statement_address_pltime'] == 'infinity')
           ) {
            $id_assoc_statement_address .= "\n\taddress";
            $id_assoc_statement_address .= " {$wancfg['adv_dhcp6_id_assoc_statement_address']}";
            $id_assoc_statement_address .= " {$wancfg['adv_dhcp6_id_assoc_statement_address_pltime']}";
            if (is_numeric($wancfg['adv_dhcp6_id_assoc_statement_address_vltime']) ||
              $wancfg['adv_dhcp6_id_assoc_statement_address_vltime'] == 'infinity' ) {
                $id_assoc_statement_address .= " {$wancfg['adv_dhcp6_id_assoc_statement_address_vltime']}";
            }
            $id_assoc_statement_address .= ";\n";
        }

        $id_assoc_statement_address  .= "};\n";
    }

    $id_assoc_statement_prefix = "";
    if ($wancfg['adv_dhcp6_id_assoc_statement_prefix_enable'] != '') {
        $id_assoc_statement_prefix .= "id-assoc";
        $id_assoc_statement_prefix .= " pd";
        if (is_numeric($wancfg['adv_dhcp6_id_assoc_statement_prefix_id'])) {
            $id_assoc_statement_prefix .= " {$wancfg['adv_dhcp6_id_assoc_statement_prefix_id']}";
        }
        $id_assoc_statement_prefix .= " { ";

        if (($wancfg['adv_dhcp6_id_assoc_statement_prefix'] != '') &&
            (is_numeric($wancfg['adv_dhcp6_id_assoc_statement_prefix_pltime']) ||
            $wancfg['adv_dhcp6_id_assoc_statement_prefix_pltime'] == 'infinity')
           ) {
             $id_assoc_statement_prefix .= "\n\tprefix";
             $id_assoc_statement_prefix .= " {$wancfg['adv_dhcp6_id_assoc_statement_prefix']}";
            $id_assoc_statement_prefix .= " {$wancfg['adv_dhcp6_id_assoc_statement_prefix_pltime']}";
            if ((is_numeric($wancfg['adv_dhcp6_id_assoc_statement_prefix_vltime'])) ||
                ($wancfg['adv_dhcp6_id_assoc_statement_prefix_vltime'] == 'infinity') ) {
                $id_assoc_statement_prefix .= " {$wancfg['adv_dhcp6_id_assoc_statement_prefix_vltime']}";
            }
            $id_assoc_statement_prefix .= ";";
        }

        if (is_numeric($wancfg['adv_dhcp6_prefix_interface_statement_sla_id'])) {
            $id_assoc_statement_prefix .= "\n\tprefix-interface";
            $id_assoc_statement_prefix .= " {$wanif}";
            $id_assoc_statement_prefix .= " {\n";
            $id_assoc_statement_prefix .= "\t\tsla-id {$wancfg['adv_dhcp6_prefix_interface_statement_sla_id']};\n";
            if (($wancfg['adv_dhcp6_prefix_interface_statement_sla_len'] >= 0) &&
                ($wancfg['adv_dhcp6_prefix_interface_statement_sla_len'] <= 128)
            ) {
                $id_assoc_statement_prefix .= "\t\tsla-len {$wancfg['adv_dhcp6_prefix_interface_statement_sla_len']};\n";
            }
            $id_assoc_statement_prefix .= "\t};";
        }

        if (($wancfg['adv_dhcp6_id_assoc_statement_prefix'] != '') ||
            (is_numeric($wancfg['adv_dhcp6_prefix_interface_statement_sla_id']))
          ) {
            $id_assoc_statement_prefix .= "\n";
        }

        $id_assoc_statement_prefix  .= "};\n";
    }

    $authentication_statement = "";
    if (($wancfg['adv_dhcp6_authentication_statement_authname'] != '') &&
        ($wancfg['adv_dhcp6_authentication_statement_protocol'] == 'delayed') ) {
        $authentication_statement .= "authentication";
        $authentication_statement .= " {$wancfg['adv_dhcp6_authentication_statement_authname']}";
        $authentication_statement .= " {\n";
        $authentication_statement .= "\tprotocol {$wancfg['adv_dhcp6_authentication_statement_protocol']};\n";
        if (preg_match("/(hmac(-)?md5)||(HMAC(-)?MD5)/", $wancfg['adv_dhcp6_authentication_statement_algorithm'])) {
            $authentication_statement .= "\talgorithm {$wancfg['adv_dhcp6_authentication_statement_algorithm']};\n";
        }
        if ($wancfg['adv_dhcp6_authentication_statement_rdm'] == 'monocounter') {
            $authentication_statement .= "\trdm {$wancfg['adv_dhcp6_authentication_statement_rdm']};\n";
        }
        $authentication_statement .= "};\n";
    }

    $key_info_statement = "";
    if (($wancfg['adv_dhcp6_key_info_statement_keyname'] != '') &&
        ($wancfg['adv_dhcp6_key_info_statement_realm'] != '') &&
        (is_numeric($wancfg['adv_dhcp6_key_info_statement_keyid'])) &&
        ($wancfg['adv_dhcp6_key_info_statement_secret'] != '') ) {
        $key_info_statement .= "keyinfo";
        $key_info_statement .= " {$wancfg['adv_dhcp6_key_info_statement_keyname']}";
        $key_info_statement .= " {\n";
        $key_info_statement .= "\trealm \"{$wancfg['adv_dhcp6_key_info_statement_realm']}\";\n";
        $key_info_statement .= "\tkeyid {$wancfg['adv_dhcp6_key_info_statement_keyid']};\n";
        $key_info_statement .= "\tsecret \"{$wancfg['adv_dhcp6_key_info_statement_secret']}\";\n";
        if (preg_match("/((([0-9]{4}-)?[0-9]{2}[0-9]{2} )?[0-9]{2}:[0-9]{2})||(foreever)/", $wancfg['adv_dhcp6_key_info_statement_expire'])) {
            $key_info_statement .= "\texpire \"{$wancfg['adv_dhcp6_key_info_statement_expire']}\";\n";
        }
        $key_info_statement .= "};\n";
    }

    $dhcp6cconf  = $interface_statement;
    $dhcp6cconf .= $id_assoc_statement_address;
    $dhcp6cconf .= $id_assoc_statement_prefix;
    $dhcp6cconf .= $authentication_statement;
    $dhcp6cconf .= $key_info_statement;

    $dhcp6cconf = DHCP6_Config_File_Substitutions($wancfg, $wanif, $dhcp6cconf);

    return $dhcp6cconf;
}

function DHCP6_Config_File_Substitutions($wancfg, $wanif, $dhcp6cconf)
{
    $dhcp6cconf = DHCP_Config_File_Substitutions($wancfg, $wanif, $dhcp6cconf);

    return $dhcp6cconf;
}


function interface_dhcp_configure($interface = 'wan')
{
    global $config;

    $wancfg = $config['interfaces'][$interface];
    $wanif = $wancfg['if'];
    if (empty($wancfg)) {
        $wancfg = array();
    }

    /* generate dhclient_wan.conf */
    $fd = fopen("/var/etc/dhclient_{$interface}.conf", "w");
    if (!$fd) {
        printf(printf(gettext("Error: cannot open dhclient_%s.conf in interface_dhcp_configure() for writing.%s"), $interface, "\n"));
        return 1;
    }

    if ($wancfg['dhcphostname']) {
        $dhclientconf_hostname = "send dhcp-client-identifier \"{$wancfg['dhcphostname']}\";\n";
        $dhclientconf_hostname .= "\tsend host-name \"{$wancfg['dhcphostname']}\";\n";
    } else {
        $dhclientconf_hostname = "";
    }

    $wanif = get_real_interface($interface);
    if (empty($wanif)) {
        log_error(sprintf('Invalid interface "%s" in interface_dhcp_configure()', $interface));
        return 0;
    }
    $dhclientconf = "";

    $dhclientconf .= <<<EOD
interface "{$wanif}" {
timeout 60;
retry 15;
select-timeout 0;
initial-interval 1;
  {$dhclientconf_hostname}
  script "/usr/local/sbin/dhclient-script.ext";
EOD;

    if (is_ipaddrv4($wancfg['dhcprejectfrom'])) {
        $dhclientconf .= <<<EOD

  reject {$wancfg['dhcprejectfrom']};
EOD;
    }
    $dhclientconf .= <<<EOD

}

EOD;

    // DHCP Config File Advanced
    if ($wancfg['adv_dhcp_config_advanced']) {
        $dhclientconf = DHCP_Config_File_Advanced($interface, $wancfg, $wanif);
    }

    if (is_ipaddr($wancfg['alias-address'])) {
        $subnetmask = gen_subnet_mask($wancfg['alias-subnet']);
        $dhclientconf .= <<<EOD
alias {
  interface  "{$wanif}";
  fixed-address {$wancfg['alias-address']};
  option subnet-mask {$subnetmask};
}

EOD;
    }

    // DHCP Config File Override
    if (!empty($wancfg['adv_dhcp_config_file_override'])) {
        $dhclientfile = $wancfg['adv_dhcp_config_file_override_path'];
        if (file_exists($dhclientfile)) {
            $dhclientconf = file_get_contents($dhclientfile);
            $dhclientconf = DHCP_Config_File_Substitutions($wancfg, $wanif, $dhclientconf);
        } else {
            log_error(sprintf('DHCP config file override does not exist: "%s"', $dhclientfile));
        }
    }

    fwrite($fd, $dhclientconf);
    fclose($fd);

    /* bring wan interface up before starting dhclient */
    if ($wanif) {
        interfaces_bring_up($wanif);
    } else {
        log_error(sprintf('Could not bring up %s interface in interface_dhcp_configure()', $wanif));
    }

    /* Make sure dhclient is not running */
    kill_dhclient_process($wanif);

    /* fire up dhclient */
    mwexec("/sbin/dhclient -c /var/etc/dhclient_{$interface}.conf {$wanif} > /tmp/{$wanif}_output 2> /tmp/{$wanif}_error_output");

    return 0;
}

function DHCP_Config_File_Advanced($interface, $wancfg, $wanif)
{
    $hostname = "";
    if ($wancfg['dhcphostname'] != '') {
        $hostname = "\tsend host-name \"{$wancfg['dhcphostname']}\";\n";
    }

    /* DHCP Protocol Timings */
    $protocol_timings = array ('adv_dhcp_pt_timeout' => "timeout", 'adv_dhcp_pt_retry' => "retry", 'adv_dhcp_pt_select_timeout' => "select-timeout", 'adv_dhcp_pt_reboot' => "reboot", 'adv_dhcp_pt_backoff_cutoff' => "backoff-cutoff", 'adv_dhcp_pt_initial_interval' => "initial-interval");
    foreach ($protocol_timings as $Protocol_Timing => $PT_Name) {
        $pt_variable = "{$Protocol_Timing}";
        ${$pt_variable} = "";
        if ($wancfg[$Protocol_Timing] != "") {
            ${$pt_variable} = "{$PT_Name} {$wancfg[$Protocol_Timing]};\n";
        }
    }

    $send_options = "";
    if ($wancfg['adv_dhcp_send_options'] != '') {
        $options = preg_split('/\s*,\s*(?=(?:[^"]*"[^"]*")*[^"]*$)/', $wancfg['adv_dhcp_send_options']);
        foreach ($options as $option) {
            $send_options .= "\tsend " . $option . ";\n";
        }
    }

    $request_options = "";
    if ($wancfg['adv_dhcp_request_options'] != '') {
        $request_options = "\trequest {$wancfg['adv_dhcp_request_options']};\n";
    }

    $required_options = "";
    if ($wancfg['adv_dhcp_required_options'] != '') {
        $required_options = "\trequire {$wancfg['adv_dhcp_required_options']};\n";
    }

    $option_modifiers = "";
    if ($wancfg['adv_dhcp_option_modifiers'] != '') {
        $modifiers = preg_split('/\s*,\s*(?=(?:[^"]*"[^"]*")*[^"]*$)/', $wancfg['adv_dhcp_option_modifiers']);
        foreach ($modifiers as $modifier) {
            $option_modifiers .= "\t" . $modifier . ";\n";
        }
    }

    $dhclientconf  = "interface \"{$wanif}\" {\n";
    $dhclientconf .= "\n";
    $dhclientconf .= "# DHCP Protocol Timing Values\n";
    $dhclientconf .= "{$adv_dhcp_pt_timeout}";
    $dhclientconf .= "{$adv_dhcp_pt_retry}";
    $dhclientconf .= "{$adv_dhcp_pt_select_timeout}";
    $dhclientconf .= "{$adv_dhcp_pt_reboot}";
    $dhclientconf .= "{$adv_dhcp_pt_backoff_cutoff}";
    $dhclientconf .= "{$adv_dhcp_pt_initial_interval}";
    $dhclientconf .= "\n";
    $dhclientconf .= "# DHCP Protocol Options\n";
    $dhclientconf .= "{$hostname}";
    $dhclientconf .= "{$send_options}";
    $dhclientconf .= "{$request_options}";
    $dhclientconf .= "{$required_options}";
    $dhclientconf .= "{$option_modifiers}";
    $dhclientconf .= "\n";
    $dhclientconf .= "\tscript \"/usr/local/sbin/dhclient-script.ext\";\n";
    $dhclientconf .= "}\n";

    $dhclientconf = DHCP_Config_File_Substitutions($wancfg, $wanif, $dhclientconf);

    return $dhclientconf;
}

function DHCP_Config_File_Substitutions($wancfg, $wanif, $dhclientconf)
{

    /* Apply Interface Substitutions */
    $dhclientconf = str_replace("{interface}", "{
                        $wanif}", $dhclientconf);

    /* Apply Hostname Substitutions */
    $dhclientconf = str_replace("{hostname}", $wancfg['dhcphostname'], $dhclientconf);

    /* Arrays of MAC Address Types, Cases, Delimiters */
    /* ASCII or HEX, Upper or Lower Case, Various Delimiters (none, space, colon, hyphen, period) */
    $various_mac_types      = array("mac_addr_ascii", "mac_addr_hex");
    $various_mac_cases      = array("U", "L");
    $various_mac_delimiters = array("", " ", ":", "-", ".");

    /* Apply MAC Address Substitutions */
    foreach ($various_mac_types as $various_mac_type) {
        foreach ($various_mac_cases as $various_mac_case) {
            foreach ($various_mac_delimiters as $various_mac_delimiter) {
                $res = stripos($dhclientconf, $various_mac_type . $various_mac_case . $various_mac_delimiter);
                if ($res !== false) {
                    /* Get MAC Address as ASCII String With Colon (:) Celimiters */
                    if ("$various_mac_case" == "U") {
                        $dhcpclientconf_mac = strtoupper(get_interface_mac($wanif));
                    }
                    if ("$various_mac_case" == "L") {
                        $dhcpclientconf_mac = strtolower(get_interface_mac($wanif));
                    }

                    if ("$various_mac_type" == "mac_addr_hex") {
                        /* Convert MAC ascii string to HEX with colon (:) delimiters. */
                        $dhcpclientconf_mac = str_replace(":", "", $dhcpclientconf_mac);
                        $dhcpclientconf_mac_hex = "";
                        $delimiter = "";
                        for ($i = 0; $i < strlen($dhcpclientconf_mac); $i++) {
                            $dhcpclientconf_mac_hex .= $delimiter. bin2hex($dhcpclientconf_mac[$i]);
                            $delimiter = ":";
                        }
                        $dhcpclientconf_mac = $dhcpclientconf_mac_hex;
                    }

                    /* MAC Address Delimiter Substitutions */
                    $dhcpclientconf_mac = str_replace(":", $various_mac_delimiter, $dhcpclientconf_mac);

                    /* Apply MAC Address Substitutions */
                    $dhclientconf = str_replace("{" . $various_mac_type . $various_mac_case . $various_mac_delimiter . "}", $dhcpclientconf_mac, $dhclientconf);
                }
            }
        }
    }

    return $dhclientconf;
}

function interfaces_group_setup()
{
    global $config;

    if (!isset($config['ifgroups']['ifgroupentry'])) {
        return;
    }

    foreach ($config['ifgroups']['ifgroupentry'] as $groupar) {
        interface_group_setup($groupar);
    }
}

function interface_group_setup(&$groupname)
{
    global $config;

    if (!is_array($groupname)) {
        return;
    }

    $members = explode(" ", $groupname['members']);
    foreach ($members as $ifs) {
        $realif = get_real_interface($ifs);
        if ($realif) {
            mwexec("/sbin/ifconfig {$realif} group {$groupname['ifname']}");
        }
    }
}

function is_interface_group($if)
{
    global $config;

    if (isset($config['ifgroups']['ifgroupentry'])) {
        foreach ($config['ifgroups']['ifgroupentry'] as $groupentry) {
            if ($groupentry['ifname'] === $if) {
                return true;
            }
        }
    }

    return false;
}

function interface_group_add_member($interface, $groupname)
{
    $interface = get_real_interface($interface);
    mwexec("/sbin/ifconfig {$interface} group " . escapeshellarg($groupname), true);
}

/* convert fxp0 -> wan, etc. */
function convert_real_interface_to_friendly_interface_name($interface = 'wan')
{
    global $config;

    if (!isset($config['interfaces'])) {
        /* some people do trigger this, I don't know why :) */
        return null;
    }

    foreach (legacy_config_get_interfaces() as $if => $ifname) {
        if ($if == $interface || $ifname['if'] == $interface) {
            return $if;
        }

        if (get_real_interface($if) == $interface) {
            return $if;
        }

        $int = get_parent_interface($if, true);
        if (is_array($int)) {
            foreach ($int as $iface) {
                if ($iface == $interface) {
                    return $if;
                }
            }
        }
    }

    if ($interface == 'enc0') {
        return 'IPsec';
    }

    return null;
}

/* attempt to resolve interface to friendly descr */
function convert_friendly_interface_to_friendly_descr($interface)
{
    global $config;
    $ifdesc = null;

    switch ($interface) {
        case "l2tp":
            $ifdesc = "L2TP";
            break;
        case "pptp":
            $ifdesc = "PPTP";
            break;
        case "pppoe":
            $ifdesc = "PPPoE";
            break;
        case "openvpn":
            $ifdesc = "OpenVPN";
            break;
        case "enc0":
        case "ipsec":
        case "IPsec":
            $ifdesc = "IPsec";
            break;
        default:
            if (isset($config['interfaces'][$interface])) {
                if (empty($config['interfaces'][$interface]['descr'])) {
                    $ifdesc = strtoupper($interface);
                } else {
                    $ifdesc = strtoupper($config['interfaces'][$interface]['descr']);
                }
                break;
            } elseif (stristr($interface, "_vip")) {
                if (isset($config['virtualip']['vip'])) {
                    foreach ($config['virtualip']['vip'] as $counter => $vip) {
                        if ($vip['mode'] == "carp") {
                            if ($interface == "{$vip['interface']}_vip{$vip['vhid']}") {
                                return "{$vip['subnet']} - {$vip['descr']}";
                            }
                        }
                    }
                }
            } else {
                /* if list */
                $ifdescrs = get_configured_interface_with_descr(false, true);
                foreach ($ifdescrs as $if => $ifname) {
                    if ($if == $interface || $ifname == $interface) {
                        return $ifname;
                    }
                }
            }
            break;
    }

    return $ifdesc;
}

function convert_real_interface_to_friendly_descr($interface)
{
    $ifdesc = convert_real_interface_to_friendly_interface_name("{$interface}");

    if (!empty($ifdesc)) {
        return convert_friendly_interface_to_friendly_descr($ifdesc);
    }

    return $interface;
}

/*
 *  get_parent_interface($interface):
 *      --returns the (real or virtual) parent interface(s) array for a given interface friendly name (i.e. wan)
 *        or virtual interface (i.e. vlan)
 *        (We need array because MLPPP and bridge interfaces have more than one parent.)
 *      -- returns $interface passed in if $interface parent is not found
 *      -- returns empty array if an invalid interface is passed
 *  (Only handles ppps and vlans now.)
 */
function get_parent_interface($interface, $avoidrecurse = false)
{
    global $config;

    $parents = array();
    //Check that we got a valid interface passed
    $realif = get_real_interface($interface);
    if ($realif == null) {
        return $parents;
    }

    // If we got a real interface, find it's friendly assigned name
    if ($interface == $realif && $avoidrecurse == false) {
        $interface = convert_real_interface_to_friendly_interface_name($interface);
    }

    if (!empty($interface) && isset($config['interfaces'][$interface])) {
        $ifcfg = $config['interfaces'][$interface];
        switch ($ifcfg['ipaddr']) {
            case "ppp":
            case "pppoe":
            case "pptp":
            case "l2tp":
                if (empty($parents)) {
                    if (isset($config['ppps']['ppp'])) {
                        foreach ($config['ppps']['ppp'] as $pppidx => $ppp) {
                            if ($ifcfg['if'] == $ppp['if']) {
                                $ports = explode(',', $ppp['ports']);
                                foreach ($ports as $pid => $parent_if) {
                                    $parents[$pid] = get_real_interface($parent_if);
                                }
                                break;
                            }
                        }
                    }
                }
                break;
            case "dhcp":
            case "static":
            default:
                // Handle _vlans
                if (stristr($realif, "_vlan")) {
                    if (isset($config['vlans']['vlan'])) {
                        foreach ($config['vlans']['vlan'] as $vlanidx => $vlan) {
                            if ($ifcfg['if'] == $vlan['vlanif']) {
                                $parents[0] = $vlan['if'];
                                break;
                            }
                        }
                    }
                }
                break;
        }
    }

    if (empty($parents)) {
        $parents[0] = $realif;
    }

    return $parents;
}


function interface_get_wireless_base($wlif)
{
    if (!stristr($wlif, "_wlan")) {
        return $wlif;
    } else {
        return substr($wlif, 0, stripos($wlif, "_wlan"));
    }
}

function interface_get_wireless_clone($wlif)
{
    if (!stristr($wlif, "_wlan")) {
        return $wlif . "_wlan0";
    } else {
        return $wlif;
    }
}

function get_real_interface($interface = "wan", $family = "all", $realv6iface = false, $flush = true)
{
    global $config;

    $wanif = null;

    switch ($interface) {
        case "openvpn":
        case "ppp":
            $wanif = $interface;
            break;
        case "ipsec":
        case "enc0":
            $wanif = "enc0";
            break;
        default:
            // If a real interface was alread passed simply
            // pass the real interface back.  This encourages
            // the usage of this function in more cases so that
            // we can combine logic for more flexibility.
            if (does_interface_exist($interface, $flush)) {
                $wanif = $interface;
                break;
            }

            if (empty($config['interfaces'][$interface])) {
                break;
            }

            $cfg = &$config['interfaces'][$interface];

            if ($family == "inet6") {
                if (isset($cfg['ipaddrv6'])) {
                    $ipaddrv6 = $cfg['ipaddrv6'];
                } else {
                    $ipaddrv6 = "";
                }
                switch ($ipaddrv6) {
                    case "6rd":
                    case "6to4":
                        $wanif = "{$interface}_stf";
                        break;
                    case 'pppoe':
                    case 'ppp':
                    case 'l2tp':
                    case 'pptp':
                        if (isset($cfg['wireless']) || match_wireless_interface($cfg['if'])) {
                            $wanif = interface_get_wireless_clone($cfg['if']);
                        } else {
                            $wanif = $cfg['if'];
                        }
                        break;
                    default:
                        switch ($cfg['ipaddr']) {
                            case 'pppoe':
                            case 'ppp':
                            case 'l2tp':
                            case 'pptp':
                                if (isset($cfg['dhcp6usev4iface']) && $realv6iface === false) {
                                    $wanif = $cfg['if'];
                                } else {
                                    $parents = get_parent_interface($interface);
                                    if (!empty($parents[0])) {
                                        $wanif = $parents[0];
                                    } else {
                                        $wanif = $cfg['if'];
                                    }
                                }
                                break;
                            default:
                                if (isset($cfg['wireless']) || match_wireless_interface($cfg['if'])) {
                                    $wanif = interface_get_wireless_clone($cfg['if']);
                                } else {
                                    $wanif = $cfg['if'];
                                }
                                break;
                        }
                        break;
                }
            } else {
                // Wireless cloned NIC support (FreeBSD 8+)
                // interface name format: $parentnic_wlanparentnic#
                // example: ath0_wlan0
                if (isset($cfg['wireless']) || match_wireless_interface($cfg['if'])) {
                    $wanif = interface_get_wireless_clone($cfg['if']);
                } else {
                    $wanif = $cfg['if'];
                }
            }
            break;
    }

    return $wanif;
}

/* Guess the physical interface by providing a IP address */
function guess_interface_from_ip($ipaddress)
{
    if (!is_ipaddr($ipaddress)) {
        return false;
    }
    if (is_ipaddrv4($ipaddress)) {
        /* create a route table we can search */
        exec("/usr/bin/netstat -rnWf inet", $output, $ret);
        foreach ($output as $line) {
            if (preg_match("/^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+\/[0-9]+[ ]+link[#]/", $line)) {
                $fields = preg_split("/[ ]+/", $line);
                if (ip_in_subnet($ipaddress, $fields[0])) {
                    return $fields[5];
                }
            }
        }
    }
    /* FIXME: This works from cursory testing, regexp might need fine tuning */
    if (is_ipaddrv6($ipaddress)) {
        /* create a route table we can search */
        exec("/usr/bin/netstat -rnWf inet6", $output, $ret);
        foreach ($output as $line) {
            if (preg_match("/[0-9a-f]+[:]+[0-9a-f]+[:]+[\/][0-9]+/", $line)) {
                $fields = preg_split("/[ ]+/", $line);
                if (ip_in_subnet($ipaddress, $fields[0])) {
                    return $fields[5];
                }
            }
        }
    }
    $ret = exec_command("/sbin/route -n get {$ipaddress} | /usr/bin/awk '/interface/ { print \$2; };'");
    if (empty($ret)) {
        return false;
    }
    return $ret;
}

function link_interface_to_track6($int, $action = '')
{
    global $config;

    if (empty($int)) {
        return;
    }

    if (isset($config['interfaces'])) {
        $list = array();
        foreach (legacy_config_get_interfaces(array("virtual" => false)) as $ifname => $ifcfg) {
            if (!isset($ifcfg['enable'])) {
                continue;
            }
            if (!empty($ifcfg['ipaddrv6']) && $ifcfg['track6-interface'] == $int) {
                if ($action == "update") {
                    interface_track6_configure($ifname, $ifcfg);
                } elseif ($action == "") {
                    $list[$ifname] = $ifcfg;
                }
            }
        }
        return $list;
    }
}

function link_interface_to_vlans($int, $action = '')
{
    global $config;

    if (empty($int)) {
        return;
    }

    if (isset($config['vlans']['vlan'])) {
        $ifaces = array();
        foreach ($config['vlans']['vlan'] as $vlan) {
            if ($int == $vlan['if']) {
                if ($action == "update") {
                    interfaces_bring_up($int);
                } elseif ($action == "") {
                    $ifaces[$vlan['tag']] = $vlan;
                }
            }
        }
        if (!empty($ifaces)) {
            return $ifaces;
        }
    }
}

function link_interface_to_vips($int, $action = '')
{
    global $config;

    if (isset($config['virtualip']['vip'])) {
        $result = array();
        foreach ($config['virtualip']['vip'] as $vip) {
            if ($int == $vip['interface']) {
                if ($action == 'update') {
                    interfaces_vips_configure($int);
                } else {
                    $result[] = $vip;
                }
            }
        }
        return $result;
    }
}

/****f* interfaces/link_interface_to_bridge
 * NAME
 *   link_interface_to_bridge - Finds out a bridge group for an interface
 * INPUTS
 *   $ip
 * RESULT
 *   bridge[0-99]
 ******/
function link_interface_to_bridge($int)
{
    global $config;

    if (isset($config['bridges']['bridged'])) {
        foreach ($config['bridges']['bridged'] as $bridge) {
            if (in_array($int, explode(',', $bridge['members']))) {
                return "{$bridge['bridgeif']}";
            }
        }
    }
}

function link_interface_to_group($int)
{
    global $config;

    $result = array();

    if (isset($config['ifgroups']['ifgroupentry'])) {
        foreach ($config['ifgroups']['ifgroupentry'] as $group) {
            if (in_array($int, explode(" ", $group['members']))) {
                $result[$group['ifname']] = $int;
            }
        }
    }

    return $result;
}

function link_interface_to_gre($interface)
{
    global $config;

    $result = array();

    if (isset($config['gres']['gre'])) {
        foreach ($config['gres']['gre'] as $gre) {
            if ($gre['if'] == $interface) {
                $result[] = $gre;
            }
        }
    }

    return $result;
}

function link_interface_to_gif($interface)
{
    global $config;

    $result = array();

    if (isset($config['gifs']['gif'])) {
        foreach ($config['gifs']['gif'] as $gif) {
            if ($gif['if'] == $interface) {
                $result[] = $gif;
            }
        }
    }

    return $result;
}

/*
 * find_interface_ip($interface): return the interface ip (first found)
 */
function find_interface_ip($interface)
{
    $interface = trim($interface);
    if (does_interface_exist($interface)) {
        $ifinfo = legacy_get_interface_addresses($interface);
        if (isset($ifinfo['ipaddr'])) {
            return $ifinfo['ipaddr'];
        }
    }
    return null;
}

/*
 * find_interface_ipv6($interface): return the interface ip (first found)
 */
function find_interface_ipv6($interface)
{
    // a bit obscure, why should this be different then find_interface_ip?
    $interface = get_real_interface(trim($interface));
    if (does_interface_exist($interface)) {
        $ifinfo = legacy_get_interface_addresses($interface);
        if (isset($ifinfo['ipaddr6'])) {
            return $ifinfo['ipaddr6'];
        }
    }
    return null;
}

/*
 * find_interface_ipv6_ll($interface): return the interface ipv6 link local (first found)
 */
function find_interface_ipv6_ll($interface)
{
    $interface = trim($interface);
    if (does_interface_exist($interface)) {
        $ifinfo = legacy_getall_interface_addresses($interface);
        foreach ($ifinfo as $line) {
            if (strstr($line, ":")) {
                $parts = explode("/", $line);
                if (is_linklocal($parts[0])) {
                    return $parts[0];
                }
            }
        }
    }
    return null;
}

function find_interface_subnet($interface)
{
    $interface = trim($interface);
    if (does_interface_exist($interface)) {
        $ifinfo = legacy_get_interface_addresses($interface);
        if (isset($ifinfo['subnetbits'])) {
            return $ifinfo['subnetbits'];
        }
    }
    return null;
}

function find_interface_subnet6($interface)
{
    $interface = trim($interface);
    if (does_interface_exist($interface)) {
        $ifinfo = legacy_get_interface_addresses($interface);
        if (isset($ifinfo['subnetbits6'])) {
            return $ifinfo['subnetbits6'];
        }
    }
    return null;
}

function ip_in_interface_alias_subnet($interface, $ipalias)
{
    global $config;

    if (empty($interface) || !is_ipaddr($ipalias)) {
        return false;
    }
    if (isset($config['virtualip']['vip'])) {
        foreach ($config['virtualip']['vip'] as $vip) {
            switch ($vip['mode']) {
                case "ipalias":
                    if ($vip['interface'] <> $interface) {
                        break;
                    }
                    $subnet = is_ipaddrv6($ipalias) ? gen_subnetv6($vip['subnet'], $vip['subnet_bits']) : gen_subnet($vip['subnet'], $vip['subnet_bits']);
                    if (ip_in_subnet($ipalias, $subnet . "/" . $vip['subnet_bits'])) {
                        return true;
                    }
                    break;
            }
        }
    }

    return false;
}

function get_interface_ip($interface = "wan")
{
    $realif = get_failover_interface($interface);
    if (!$realif) {
        if (strstr($interface, "_vip")) {
            return get_configured_carp_interface_list($interface);
        } else {
            return null;
        }
    }

    $curip = find_interface_ip($realif);
    if ($curip && is_ipaddr($curip) && ($curip != "0.0.0.0")) {
        return $curip;
    } else {
        return null;
    }
}

function get_interface_ipv6($interface = "wan", $flush = false)
{
    global $config;

    $realif = get_failover_interface($interface, "inet6");
    if (!$realif) {
        if (strstr($interface, "_vip")) {
            return get_configured_carp_interface_list($interface, "inet6");
        } else {
            return null;
        }
    }

    /*
     * NOTE: On the case when only the prefix is requested,
     * the communication on WAN will be done over link-local.
     */
    if (isset($config['interfaces'][$interface])) {
        switch ($config['interfaces'][$interface]['ipaddr']) {
            case 'pppoe':
            case 'l2tp':
            case 'pptp':
            case 'ppp':
                if ($config['interfaces'][$interface]['ipaddrv6'] == 'dhcp6') {
                    $realif = get_real_interface($interface, 'inet6');
                }
                break;
        }
        if (isset($config['interfaces'][$interface]['dhcp6prefixonly'])) {
            $curip = find_interface_ipv6_ll($realif, $flush);
            if ($curip && is_ipaddrv6($curip) && ($curip != "::")) {
                return $curip;
            }
        }
    }

    $curip = find_interface_ipv6($realif, $flush);
    if ($curip && is_ipaddrv6($curip) && ($curip != "::")) {
        return $curip;
    } else {
        return null;
    }
}

function get_interface_linklocal($interface = "wan")
{
    $realif = get_failover_interface($interface, "inet6");
    if (!$realif) {
        if (strstr($interface, "_vip")) {
            list($interface, $vhid) = explode("_vip", $interface);
            $realif = get_real_interface($interface);
        } else {
            return null;
        }
    }

    $curip = find_interface_ipv6_ll($realif);
    if ($curip && is_ipaddrv6($curip) && ($curip != "::")) {
        return $curip;
    } else {
        return null;
    }
}

function get_interface_subnet($interface = "wan")
{
    $realif = get_real_interface($interface);
    if (!$realif) {
        if (strstr($interface, "_vip")) {
            list($interface, $vhid) = explode("_vip", $interface);
            $realif = get_real_interface($interface);
        } else {
            return null;
        }
    }

    $cursn = find_interface_subnet($realif);
    if (!empty($cursn)) {
        return $cursn;
    }

    return null;
}

function get_interface_subnetv6($interface = "wan")
{
    global $config;

    $realif = get_real_interface($interface, "inet6");
    if (!$realif) {
        if (strstr($interface, "_vip")) {
            list($interface, $vhid) = explode("_vip", $interface);
            $realif = get_real_interface($interface);
        } else {
            return null;
        }
    }

    if (does_interface_exist($realif)) {
        $ifinfo = legacy_get_interface_addresses($realif);
        if (isset($ifinfo['subnetbits6'])) {
            return $ifinfo['subnetbits6'];
        }
    }

    return null;
}

/* return true if interface has a gateway */
function interface_has_gateway($friendly)
{
    global $config;

    if (!empty($config['interfaces'][$friendly])) {
        $ifname = &$config['interfaces'][$friendly];
        switch ($ifname['ipaddr']) {
            case "dhcp":
            case "pppoe":
            case "pptp":
            case "l2tp":
            case "ppp":
                return true;
                break;
            default:
                if (substr($ifname['if'], 0, 4) ==  "ovpn") {
                    return true;
                }
                $tunnelif = substr($ifname['if'], 0, 3);
                if ($tunnelif == "gif" || $tunnelif == "gre") {
                    return true;
                }
                if (!empty($ifname['gateway'])) {
                    return true;
                }
                break;
        }
    }

    return false;
}

/* return true if interface has a gateway */
function interface_has_gatewayv6($friendly)
{
    global $config;

    if (!empty($config['interfaces'][$friendly])) {
        $ifname = &$config['interfaces'][$friendly];
        if (isset($ifname['ipaddrv6'])) {
            $ipaddrv6 = $ifname['ipaddrv6'];
        } else {
            $ipaddrv6 = "";
        }
        switch ($ipaddrv6) {
            case "slaac":
            case "dhcp6":
            case "6to4":
            case "6rd":
                return true;
                break;
            default:
                if (substr($ifname['if'], 0, 4) ==  "ovpn") {
                    return true;
                }
                $tunnelif = substr($ifname['if'], 0, 3);
                if ($tunnelif == "gif" || $tunnelif == "gre") {
                    return true;
                }
                if (!empty($ifname['gatewayv6'])) {
                    return true;
                }
                break;
        }
    }

    return false;
}

/****f* interfaces/is_interface_wireless
 * NAME
 *   is_interface_wireless - Returns if an interface is wireless
 * RESULT
 *   $tmp       - Returns if an interface is wireless
 ******/
function is_interface_wireless($interface)
{
    global $config;

    $friendly = convert_real_interface_to_friendly_interface_name($interface);
    if (!isset($config['interfaces'][$friendly]['wireless'])) {
        if (match_wireless_interface($interface)) {
            if (isset($config['interfaces'][$friendly])) {
                $config['interfaces'][$friendly]['wireless'] = array();
            }
            return true;
        }
        return false;
    }

    return true;
}

function get_interface_mac($interface)
{
    $macinfo = legacy_get_interface_addresses($interface);

    return $macinfo["macaddr"];
}

function is_jumbo_capable($iface)
{
    $intf_details = legacy_interface_details(trim($iface));

    return isset($intf_details['capabilities']) &&
        in_array('vlan_mtu', $intf_details['capabilities']);
}

function get_vip_descr($ipaddress)
{
    global $config;

    foreach ($config['virtualip']['vip'] as $vip) {
        if ($vip['subnet'] == $ipaddress) {
            return ($vip['descr']);
        }
    }

    return '';
}

function interfaces_staticarp_configure($if)
{
    global $config;

    $ifcfg = $config['interfaces'][$if];
    if (empty($ifcfg['if']) || !isset($ifcfg['enable'])) {
        return;
    }

    if (isset($config['dhcpd'][$if]['staticarp'])) {
        mwexecf('/sbin/ifconfig %s staticarp', array($ifcfg['if']));
        mwexecf('/usr/sbin/arp -d -i %s  -a > /dev/null 2>&1', array($ifcfg['if']));
        if (isset($config['dhcpd'][$if]['staticmap'])) {
            foreach ($config['dhcpd'][$if]['staticmap'] as $arpent) {
                if (isset($arpent['ipaddr'])) {
                    mwexecf(
                        '/usr/sbin/arp -s %s %s',
                        array($arpent['ipaddr'], $arpent['mac'])
                    );
                }
            }
        }
    } else {
        mwexecf('/sbin/ifconfig %s -staticarp', array($ifcfg['if']));
        mwexecf('/usr/sbin/arp -d -i %s  -a > /dev/null 2>&1', array($ifcfg['if']));
        if (isset($config['dhcpd'][$if]['staticmap'])) {
            foreach ($config['dhcpd'][$if]['staticmap'] as $arpent) {
                if (isset($arpent['arp_table_static_entry'])) {
                    if (isset($arpent['ipaddr'])) {
                        mwexecf(
                            '/usr/sbin/arp -s %s %s',
                            array($arpent['ipaddr'], $arpent['mac'])
                        );
                    }
                }
            }
        }
    }
}

function get_failover_interface($interface, $family = "all")
{
    global $config;

    /* shortcut to get_real_interface if we find it in the config */
    if (isset($config['interfaces'][$interface])) {
        return get_real_interface($interface, $family);
    }

    /* compare against gateway groups */
    $a_groups = return_gateway_groups_array();
    if (isset($a_groups[$interface])) {
        /* we found a gateway group, fetch the interface or vip */
        if ($a_groups[$interface][0]['vip'] <> "") {
            return $a_groups[$interface][0]['vip'];
        } else {
            return $a_groups[$interface][0]['int'];
        }
    }
    /* fall through to get_real_interface */
    /* XXX: Really needed? */
    return get_real_interface($interface, $family);
}

//returns interface information
function get_interface_info($ifdescr)
{
    global $config;

    $ifinfo = array();

    if (empty($config['interfaces'][$ifdescr])) {
        return;
    }

    $ifinfo['if'] = get_real_interface($ifdescr);

    $chkif = $ifinfo['if'];
    $ifinfotmp = legacy_get_interface_addresses($chkif);
    $ifinfo['macaddr'] = $ifinfotmp['macaddr'];
    $ifinfo['ipaddr'] = $ifinfotmp['ipaddr'];
    $ifinfo['subnet'] = $ifinfotmp['subnet'];

    $ifup = legacy_interface_listget('up');
    $ifinfo['status'] = (is_array($ifup) && in_array($chkif, $ifup)) ? 'up' : 'down';

    $ifinfo['linklocal'] = get_interface_linklocal($ifdescr);
    $ifinfo['ipaddrv6'] = get_interface_ipv6($ifdescr);
    $ifinfo['subnetv6'] = get_interface_subnetv6($ifdescr);

    $ifinfotmp = legacy_interface_stats($chkif);
    $ifinfo['inerrs'] = $ifinfotmp['input errors'];
    $ifinfo['outerrs'] = $ifinfotmp['output errors'];
    $ifinfo['collisions'] = $ifinfotmp['collisions'];

    /* Use pfctl for non wrapping 64 bit counters */
    /* Pass */
    exec("/sbin/pfctl -vvsI -i {$chkif}", $pfctlstats);
    $pf_in4_pass = preg_split("/ +/ ", $pfctlstats[3]);
    $pf_out4_pass = preg_split("/ +/", $pfctlstats[5]);
    $pf_in6_pass = preg_split("/ +/ ", $pfctlstats[7]);
    $pf_out6_pass = preg_split("/ +/", $pfctlstats[9]);
    $in4_pass = $pf_in4_pass[5];
    $out4_pass = $pf_out4_pass[5];
    $in4_pass_packets = $pf_in4_pass[3];
    $out4_pass_packets = $pf_out4_pass[3];
    $in6_pass = $pf_in6_pass[5];
    $out6_pass = $pf_out6_pass[5];
    $in6_pass_packets = $pf_in6_pass[3];
    $out6_pass_packets = $pf_out6_pass[3];
    $ifinfo['inbytespass'] = $in4_pass + $in6_pass;
    $ifinfo['outbytespass'] = $out4_pass + $out6_pass;
    $ifinfo['inpktspass'] = $in4_pass_packets + $in6_pass_packets;
    $ifinfo['outpktspass'] = $out4_pass_packets + $out6_pass_packets;

    /* Block */
    $pf_in4_block = preg_split("/ +/", $pfctlstats[4]);
    $pf_out4_block = preg_split("/ +/", $pfctlstats[6]);
    $pf_in6_block = preg_split("/ +/", $pfctlstats[8]);
    $pf_out6_block = preg_split("/ +/", $pfctlstats[10]);
    $in4_block = $pf_in4_block[5];
    $out4_block = $pf_out4_block[5];
    $in4_block_packets = $pf_in4_block[3];
    $out4_block_packets = $pf_out4_block[3];
    $in6_block = $pf_in6_block[5];
    $out6_block = $pf_out6_block[5];
    $in6_block_packets = $pf_in6_block[3];
    $out6_block_packets = $pf_out6_block[3];
    $ifinfo['inbytesblock'] = $in4_block + $in6_block;
    $ifinfo['outbytesblock'] = $out4_block + $out6_block;
    $ifinfo['inpktsblock'] = $in4_block_packets + $in6_block_packets;
    $ifinfo['outpktsblock'] = $out4_block_packets + $out6_block_packets;

    $ifinfo['inbytes'] = $in4_pass + $in6_pass;
    $ifinfo['outbytes'] = $out4_pass + $out6_pass;
    $ifinfo['inpkts'] = $in4_pass_packets + $in6_pass_packets;
    $ifinfo['outpkts'] = $out4_pass_packets + $out6_pass_packets;

    $ifconfiginfo = "";
    $link_type = $config['interfaces'][$ifdescr]['ipaddr'];
    switch ($link_type) {
        /* DHCP? -> see if dhclient is up */
        case "dhcp":
            /* see if dhclient is up */
            if (find_dhclient_process($ifinfo['if']) != 0) {
                $ifinfo['dhcplink'] = "up";
            } else {
                $ifinfo['dhcplink'] = "down";
            }

            break;
        /* PPPoE/PPTP/L2TP interface? -> get status from virtual interface */
        case "pppoe":
        case "pptp":
        case "l2tp":
            if ($ifinfo['status'] == "up") {
                /* XXX get PPPoE link status for dial on demand */
                $ifinfo["{$link_type}link"] = "up";
            } else {
                $ifinfo["{$link_type}link"] = "down";
            }
            break;
        /* PPP interface? -> get uptime for this session and cumulative uptime from the persistent log file in conf */
        case "ppp":
            if ($ifinfo['status'] == "up") {
                $ifinfo['ppplink'] = "up";
            } else {
                $ifinfo['ppplink'] = "down";
            }

            if (empty($ifinfo['status'])) {
                $ifinfo['status'] = "down";
            }

            if (isset($config['ppps']['ppp'])) {
                foreach ($config['ppps']['ppp'] as $pppid => $ppp) {
                    if ($config['interfaces'][$ifdescr]['if'] == $ppp['if']) {
                        break;
                    }
                }
            }
            $dev = $ppp['ports'];
            if ($config['interfaces'][$ifdescr]['if'] != $ppp['if'] || empty($dev)) {
                break;
            }
            if (!file_exists($dev)) {
                $ifinfo['nodevice'] = 1;
                $ifinfo['pppinfo'] = $dev . " " . gettext("device not present! Is the modem attached to the system?");
            }

            $usbmodemoutput = array();
            exec("usbconfig", $usbmodemoutput);
            $mondev = "/tmp/3gstats.{$ifdescr}";
            if (file_exists($mondev)) {
                $cellstats = file($mondev);
                /* skip header */
                $a_cellstats = explode(",", $cellstats[1]);
                if (preg_match("/huawei/i", implode("\n", $usbmodemoutput))) {
                    $ifinfo['cell_rssi'] = huawei_rssi_to_string($a_cellstats[1]);
                    $ifinfo['cell_mode'] = huawei_mode_to_string($a_cellstats[2], $a_cellstats[3]);
                    $ifinfo['cell_simstate'] = huawei_simstate_to_string($a_cellstats[10]);
                    $ifinfo['cell_service'] = huawei_service_to_string(trim($a_cellstats[11]));
                }
                if (preg_match("/zte/i", implode("\n", $usbmodemoutput))) {
                    $ifinfo['cell_rssi'] = zte_rssi_to_string($a_cellstats[1]);
                    $ifinfo['cell_mode'] = zte_mode_to_string($a_cellstats[2], $a_cellstats[3]);
                    $ifinfo['cell_simstate'] = zte_simstate_to_string($a_cellstats[10]);
                    $ifinfo['cell_service'] = zte_service_to_string(trim($a_cellstats[11]));
                }
                $ifinfo['cell_upstream'] = $a_cellstats[4];
                $ifinfo['cell_downstream'] = trim($a_cellstats[5]);
                $ifinfo['cell_sent'] = $a_cellstats[6];
                $ifinfo['cell_received'] = trim($a_cellstats[7]);
                $ifinfo['cell_bwupstream'] = $a_cellstats[8];
                $ifinfo['cell_bwdownstream'] = trim($a_cellstats[9]);
            }
            // Calculate cumulative uptime for PPP link. Useful for connections that have per minute/hour contracts so you don't go over!
            if (isset($ppp['uptime'])) {
                $ifinfo['ppp_uptime_accumulated'] = "(" . get_ppp_uptime($ifinfo['if']) . ")";
            }
            break;
        default:
            break;
    }

    if (file_exists("/var/run/{$link_type}_{$ifdescr}.pid")) {
        $sec = trim(`/usr/local/sbin/ppp-uptime.sh {$ifinfo['if']}`);
        $ifinfo['ppp_uptime'] = convert_seconds_to_hms($sec);
    }

    if ($ifinfo['status'] == "up") {
        /* try to determine media with ifconfig */
        unset($ifconfiginfo);
        exec("/sbin/ifconfig " . $ifinfo['if'], $ifconfiginfo);
        $wifconfiginfo = array();
        if (is_interface_wireless($ifdescr)) {
            exec("/sbin/ifconfig {$ifinfo['if']} list sta", $wifconfiginfo);
            array_shift($wifconfiginfo);
        }
        $matches = "";
        foreach ($ifconfiginfo as $ici) {
            /* don't list media/speed for wireless cards, as it always
               displays 2 Mbps even though clients can connect at 11 Mbps */
            if (preg_match("/media: .*? \((.*?)\)/", $ici, $matches)) {
                $ifinfo['media'] = $matches[1];
            } elseif (preg_match("/media: Ethernet (.*)/", $ici, $matches)) {
                $ifinfo['media'] = $matches[1];
            } elseif (preg_match("/media: IEEE 802.11 Wireless Ethernet (.*)/", $ici, $matches)) {
                $ifinfo['media'] = $matches[1];
            }

            if (preg_match("/status: (.*)$/", $ici, $matches)) {
                if ($matches[1] != 'active') {
                    $ifinfo['status'] = $matches[1];
                }
                if ($ifinfo['status'] == 'running') {
                    $ifinfo['status'] = 'up';
                }
            }
            if (preg_match("/channel (\S*)/", $ici, $matches)) {
                $ifinfo['channel'] = $matches[1];
            }
            if (preg_match("/ssid (\".*?\"|\S*)/", $ici, $matches)) {
                if ($matches[1][0] == '"') {
                    $ifinfo['ssid'] = substr($matches[1], 1, -1);
                } else {
                    $ifinfo['ssid'] = $matches[1];
                }
            }
            if (preg_match("/laggproto (.*)$/", $ici, $matches)) {
                $ifinfo['laggproto'] = $matches[1];
            }
            if (preg_match("/laggport: (.*)$/", $ici, $matches)) {
                $ifinfo['laggport'][] = $matches[1];
            }
        }
        foreach ($wifconfiginfo as $ici) {
            $elements = preg_split("/[ ]+/i", $ici);
            if ($elements[0] != "") {
                $ifinfo['bssid'] = $elements[0];
            }
            if ($elements[3] != "") {
                $ifinfo['rate'] = $elements[3];
            }
            if ($elements[4] != "") {
                $ifinfo['rssi'] = $elements[4];
            }

        }
        /* lookup the gateway */
        if (interface_has_gateway($ifdescr)) {
            $ifinfo['gateway'] = get_interface_gateway($ifdescr);
            $ifinfo['gatewayv6'] = get_interface_gateway_v6($ifdescr);
        }
    }

    $bridge = "";
    $bridge = link_interface_to_bridge($ifdescr);
    if ($bridge) {
        $bridge_text = `/sbin/ifconfig {$bridge}`;
        if (stristr($bridge_text, "blocking") <> false) {
            $ifinfo['bridge'] = "<b><font color='red'>" . gettext("blocking") . "</font></b> - " . gettext("check for ethernet loops");
            $ifinfo['bridgeint'] = $bridge;
        } elseif (stristr($bridge_text, "learning") <> false) {
            $ifinfo['bridge'] = gettext("learning");
            $ifinfo['bridgeint'] = $bridge;
        } elseif (stristr($bridge_text, "forwarding") <> false) {
            $ifinfo['bridge'] = gettext("forwarding");
            $ifinfo['bridgeint'] = $bridge;
        }
    }

    return $ifinfo;
}

function convert_seconds_to_hms($sec)
{
    $min=$hrs=0;
    if ($sec != 0) {
        $min = floor($sec/60);
        $sec %= 60;
    }
    if ($min != 0) {
        $hrs = floor($min/60);
        $min %= 60;
    }
    if ($sec < 10) {
        $sec = "0" . $sec;
    }
    if ($min < 10) {
        $min = "0" . $min;
    }
    if ($hrs < 10) {
        $hrs = "0" . $hrs;
    }
    $result = $hrs.":".$min.":".$sec;
    return $result;
}

function huawei_rssi_to_string($rssi)
{
    $dbm = array();
    $i = 0;
    $dbstart = -113;
    while ($i < 32) {
        $dbm[$i] = $dbstart + ($i * 2);
        $i++;
    }
    $percent = round(($rssi / 31) * 100);
    $string = "rssi:{$rssi} level:{$dbm[$rssi]}dBm percent:{$percent}%";
    return $string;
}

function huawei_mode_to_string($mode, $submode)
{
    $modes[0] = "None";
    $modes[1] = "AMPS";
    $modes[2] = "CDMA";
    $modes[3] = "GSM/GPRS";
    $modes[4] = "HDR";
    $modes[5] = "WCDMA";
    $modes[6] = "GPS";

    $submodes[0] = "No Service";
    $submodes[1] = "GSM";
    $submodes[2] = "GPRS";
    $submodes[3] = "EDGE";
    $submodes[4] = "WCDMA";
    $submodes[5] = "HSDPA";
    $submodes[6] = "HSUPA";
    $submodes[7] = "HSDPA+HSUPA";
    $submodes[8] = "TD-SCDMA";
    $submodes[9] = "HSPA+";
    $string = "{$modes[$mode]}, {$submodes[$submode]} Mode";
    return $string;
}

function huawei_service_to_string($state)
{
    $modes[0] = "No";
    $modes[1] = "Restricted";
    $modes[2] = "Valid";
    $modes[3] = "Restricted Regional";
    $modes[4] = "Powersaving";
    $string = "{$modes[$state]} Service";
    return $string;
}

function huawei_simstate_to_string($state)
{
    $modes[0] = "Invalid SIM/locked";
    $modes[1] = "Valid SIM";
    $modes[2] = "Invalid SIM CS";
    $modes[3] = "Invalid SIM PS";
    $modes[4] = "Invalid SIM CS/PS";
    $modes[255] = "Missing SIM";
    $string = "{$modes[$state]} State";
    return $string;
}

function zte_rssi_to_string($rssi)
{
    return huawei_rssi_to_string($rssi);
}

function zte_mode_to_string($mode, $submode)
{
    $modes[0] = "No Service";
    $modes[1] = "Limited Service";
    $modes[2] = "GPRS";
    $modes[3] = "GSM";
    $modes[4] = "UMTS";
    $modes[5] = "EDGE";
    $modes[6] = "HSDPA";

    $submodes[0] = "CS_ONLY";
    $submodes[1] = "PS_ONLY";
    $submodes[2] = "CS_PS";
    $submodes[3] = "CAMPED";
    $string = "{$modes[$mode]}, {$submodes[$submode]} Mode";
    return $string;
}

function zte_service_to_string($state)
{
    $modes[0] = "Initializing";
    $modes[1] = "Network Lock error";
    $modes[2] = "Network Locked";
    $modes[3] = "Unlocked or correct MCC/MNC";
    $string = "{$modes[$state]} Service";
    return $string;
}

function zte_simstate_to_string($state)
{
    $modes[0] = "No action";
    $modes[1] = "Network lock";
    $modes[2] = "(U)SIM card lock";
    $modes[3] = "Network Lock and (U)SIM card Lock";
    $string = "{$modes[$state]} State";
    return $string;
}

/* Compute the total uptime from the ppp uptime log file in the conf directory */
function get_ppp_uptime($port)
{
    if (file_exists("/conf/{$port}.log")) {
        $saved_time = file_get_contents("/conf/{$port}.log");
        $uptime_data = explode("\n", $saved_time);
        $sec=0;
        foreach ($uptime_data as $upt) {
            $sec += substr($upt, 1 + strpos($upt, " "));
        }
        return convert_seconds_to_hms($sec);
    } else {
        $total_time = gettext("No history data found!");
        return $total_time;
    }
}

/****f* legacy/is_ipaddr_configured
 * NAME
 *   is_ipaddr_configured
 * INPUTS
 *   IP Address to check.
 * RESULT
 *   returns true if the IP Address is
 *   configured and present on this device.
*/
function is_ipaddr_configured($ipaddr, $ignore_if = '')
{
    global $config;

    $isipv6 = is_ipaddrv6($ipaddr);
    if ($isipv6 === true) {
        $interface_list_ips = get_configured_ipv6_addresses();
    } else {
        $interface_list_ips = get_configured_ip_addresses();
    }

    foreach($interface_list_ips as $if => $ilips) {
        /* Also ignore CARP interfaces, it'll be checked below */
        if ($ignore_if == $if || strstr($ignore_if, "_vip")) {
            continue;
        }
        if (strcasecmp($ipaddr, $ilips) == 0) {
            return true;
        }
    }

    $interface_list_vips = get_configured_vips_list(true);
    foreach ($interface_list_vips as $id => $vip) {
        if ($ignore_if == $vip['if']) {
            continue;
        }
        if (strcasecmp($ipaddr, $vip['ipaddr']) == 0) {
            return true;
        }
    }

    return false;
}

/*
 * get_carp_interface_status($carpinterface): returns the status of a carp ip
 */
function get_carp_interface_status($carpinterface)
{
    $carp_query = '';

    /* XXX: Need to fidn a better way for this! */
    list ($interface, $vhid) = explode("_vip", $carpinterface);
    $interface = get_real_interface($interface);
    exec("/sbin/ifconfig $interface | /usr/bin/grep -v grep | /usr/bin/grep carp: | /usr/bin/grep 'vhid {$vhid}'", $carp_query);
    foreach($carp_query as $int) {
        if (stristr($int, "MASTER")) {
            return gettext("MASTER");
        } elseif (stristr($int, "BACKUP")) {
            return gettext("BACKUP");
        } elseif(stristr($int, "INIT")) {
            return gettext("INIT");
        }
    }
    return;
}

function is_interface_mismatch()
{
    global $config;

    if (isset($config['interfaces'])) {
        foreach (legacy_config_get_interfaces(array("virtual" => false)) as $ifname => $ifcfg) {
            if (preg_match("/^enc|^cua|^tun|^tap|^l2tp|^pptp|^ppp|^ovpn|^gif|^gre|^lagg|^bridge|vlan|_wlan/i", $ifcfg['if'])) {
                /* Do not check these interfaces */
                continue;
            } elseif (does_interface_exist($ifcfg['if']) == false) {
                return true;
            }
        }
    }

    return false;
}
