<?php
/*
 * interfaces.inc
 *
 * part of pfSense (https://www.pfsense.org)
 * Copyright (c) 2004-2016 Electric Sheep Fencing, LLC
 * All rights reserved.
 *
 * originally based on m0n0wall (http://m0n0.ch/wall)
 * Copyright (c) 2004 Manuel Kasper <mk@neon1.net>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgment:
 *    "This product includes software developed by the pfSense Project
 *    for use in the pfSense® software distribution. (http://www.pfsense.org/).
 *
 * 4. The names "pfSense" and "pfSense Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    coreteam@pfsense.org.
 *
 * 5. Products derived from this software may not be called "pfSense"
 *    nor may "pfSense" appear in their names without prior written
 *    permission of the Electric Sheep Fencing, LLC.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *
 * "This product includes software developed by the pfSense Project
 * for use in the pfSense software distribution (http://www.pfsense.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY THE pfSense PROJECT ``AS IS'' AND ANY
 * EXPRESSED 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 pfSense PROJECT OR
 * ITS CONTRIBUTORS 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.
 */

/* include all configuration functions */
require_once("globals.inc");
require_once("util.inc");
require_once("gwlb.inc");

function interfaces_bring_up($interface) {
	if (!$interface) {
		log_error(gettext("interfaces_bring_up() was called but no variable defined."));
		log_error("Backtrace: " . debug_backtrace());
		return;
	}
	pfSense_interface_flags($interface, IFF_UP);
}

/*
 * Return the interface array
 */
function get_interface_arr($flush = false) {
	global $interface_arr_cache;

	/* If the cache doesn't exist, build it */
	if (!isset($interface_arr_cache) or $flush) {
		$interface_arr_cache = pfSense_interface_listget();
	}

	return $interface_arr_cache;
}

/*
 * does_interface_exist($interface): return true or false if a interface is
 * detected.
 */
function does_interface_exist($interface, $flush = true) {
	global $config;

	if (!$interface) {
		return false;
	}

	$ints = get_interface_arr($flush);
	if (in_array($interface, $ints)) {
		return true;
	} else {
		return false;
	}
}

/*
 * does_vip_exist($vip): return true or false if a vip is
 * configured.
 */
function does_vip_exist($vip) {
	global $config;

	if (!$vip) {
		return false;
	}


	switch ($vip['mode']) {
		case "carp":
		case "ipalias":
			/* XXX: Make proper checks? */
			$realif = get_real_interface($vip['interface']);
			if (!does_interface_exist($realif)) {
				return false;
			}
			break;
		case "proxyarp":
			/* XXX: Implement this */
		default:
			return false;
	}

	$ifacedata = pfSense_getall_interface_addresses($realif);
	foreach ($ifacedata as $vipips) {
		if ($vipips == "{$vip['subnet']}/{$vip['subnet_bits']}") {
			return true;
		}
	}

	return false;
}

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

	$found = false;
	if (!empty($config['l2tp']) &&
	    $config['l2tp']['mode'] == "server") {
		$found = true;
	}
	if ($found == false && is_array($config['pppoes']['pppoe'])) {
		foreach ($config['pppoes']['pppoe'] as $pppoe) {
			if ($pppoe['mode'] != "server") {
				continue;
			}
			if ($pppoe['interface'] == $interface) {
				$found = true;
				break;
			}
		}
	}
	if ($found == false) {
		$found = interface_isppp_type($interface);
	}

	if ($found == false) {
		$realif = get_real_interface($interface);
		if (is_array($config['ppps']['ppp']) && count($config['ppps']['ppp'])) {
			foreach ($config['ppps']['ppp'] as $pppid => $ppp) {
				$ports = explode(',', $ppp['ports']);
				foreach ($ports as $pid => $port) {
					$port = get_real_interface($port);
					if ($realif == $port) {
						$found = true;
						break;
					}
					/* Find the parent interfaces of the vlans in the MLPPP configs
					* there should be only one element in the array here
					* -- this could be better . . . */
					$parent_if = get_parent_interface($port);
					if ($realif == $parent_if[0]) {
						$found = true;
						break;
					}
				}
			}
		}
	}

	if ($found == false) {
		$realif = get_real_interface($interface);
		pfSense_ngctl_detach("{$realif}:", $realif);
	}
	/* NOTE: We make sure for this on interface_ppps_configure()
	 *	no need to do it here again.
	 *	else
	 *		pfSense_ngctl_attach(".", $realif);
	 */
}

function interfaces_loopback_configure() {
	global $g;

	if (platform_booting()) {
		echo gettext("Configuring loopback interface...");
	}
	pfSense_interface_setaddress("lo0", "127.0.0.1");
	interfaces_bring_up("lo0");
	if (platform_booting()) {
		echo gettext("done.") . "\n";
	}
	return 0;
}

function interfaces_vlan_configure($realif = "") {
	global $config, $g;
	if (platform_booting()) {
		echo gettext("Configuring VLAN interfaces...");
	}
	if (is_array($config['vlans']['vlan']) && count($config['vlans']['vlan'])) {
		foreach ($config['vlans']['vlan'] as $vlan) {
			if (empty($vlan['vlanif'])) {
				$vlan['vlanif'] = "{$vlan['if']}_vlan{$vlan['tag']}";
			}
			if (!empty($realif) && $realif != $vlan['vlanif']) {
				continue;
			}

			/* XXX: Maybe we should report any errors?! */
			interface_vlan_configure($vlan);
		}
	}
	if (platform_booting()) {
		echo gettext("done.") . "\n";
	}
}

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

	if (!is_array($vlan)) {
		log_error(gettext("VLAN: called with wrong options. Problems with config!"));
		return;
	}
	$if = $vlan['if'];
	if (empty($if)) {
		log_error(gettext("interface_vlan_configure called with if undefined."));
		return;
	}

	$vlanif = empty($vlan['vlanif']) ? "{$if}_vlan{$vlan['tag']}" : $vlan['vlanif'];
	$tag = $vlan['tag'];
	$pcp  = empty($vlan['pcp']) ? 0 : $vlan['pcp'];	/* Apply "Best Effort" if not set */

	/* make sure the parent interface is up */
	interfaces_bring_up($if);
	/* Since we are going to add vlan(4) try to enable all that hardware supports. */
	pfSense_interface_capabilities($if, IFCAP_VLAN_HWTAGGING|IFCAP_VLAN_MTU|IFCAP_VLAN_HWFILTER);

	if (!empty($vlanif) && does_interface_exist($vlanif)) {
		pfSense_interface_destroy($vlanif);
	}

	$tmpvlanif = pfSense_interface_create("vlan");
	pfSense_interface_rename($tmpvlanif, $vlanif);
	pfSense_ngctl_name("{$tmpvlanif}:", $vlanif);

	pfSense_vlan_create($vlanif, $if, $tag, $pcp);

	interfaces_bring_up($vlanif);

	/* invalidate interface cache */
	get_interface_arr(true);

	/* configure interface if assigned */
	$assignedif = convert_real_interface_to_friendly_interface_name($vlanif);
	if ($assignedif) {
		if (isset($config['interfaces'][$assignedif]['enable'])) {
			interface_configure($assignedif, true);
		}
	}

	/* XXX: ermal -- for now leave it here at the moment it does not hurt. */
	interfaces_bring_up($if);

	return $vlanif;
}

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

	if (!is_array($vlan)) {
		log_error(sprintf(gettext("QinQ compat VLAN: called with wrong options. Problems with config!%s"), "\n"));
		return;
	}

	$qinqif = $vlan['if'];
	$tag = $vlan['tag'];
	if (empty($qinqif)) {
		log_error(sprintf(gettext("interface_qinq_configure called with if undefined.%s"), "\n"));
		return;
	}

	if (!does_interface_exist($qinqif)) {
		log_error(sprintf(gettext("interface_qinq_configure called with invalid if.%s"), "\n"));
		return;
	}

	$vlanif = interface_vlan_configure($vlan);

	if ($fd == NULL) {
		$exec = true;
		$fd = fopen("{$g['tmp_path']}/netgraphcmd", "w");
	} else {
		$exec = false;
	}
	/* make sure the parent is converted to ng_vlan(4) and is up */
	interfaces_bring_up($qinqif);

	pfSense_ngctl_attach(".", $qinqif);
	if (!empty($vlanif) && does_interface_exist($vlanif)) {
		fwrite($fd, "shutdown {$vlanif}qinq:\n");
		exec("/usr/sbin/ngctl msg {$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");
	}

	/* invalidate interface cache */
	get_interface_arr(true);

	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 == true) {
		fclose($fd);
		mwexec("/usr/sbin/ngctl -f {$g['tmp_path']}/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() {
	global $config, $g;
	if (platform_booting()) {
		echo gettext("Configuring QinQ interfaces...");
	}
	if (is_array($config['qinqs']['qinqentry']) && count($config['qinqs']['qinqentry'])) {
		foreach ($config['qinqs']['qinqentry'] as $qinq) {
			/* XXX: Maybe we should report any errors?! */
			interface_qinq_configure($qinq);
		}
	}
	if (platform_booting()) {
		echo gettext("done.") . "\n";
	}
}

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

	if (!is_array($qinq)) {
		log_error(sprintf(gettext("QinQ compat VLAN: called with wrong options. Problems with config!%s"), "\n"));
		return;
	}

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

	fwrite($fd, "shutdown {$if}h{$tag}:\n");
	fwrite($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");

	/* invalidate interface cache */
	get_interface_arr(true);

	return $vlanif;
}

function interfaces_create_wireless_clones() {
	global $config, $g;

	if (platform_booting()) {
		echo gettext("Creating wireless clone interfaces...");
	}

	$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($config['wireless']['clone']) && is_array($config['wireless']['clone']) && count($config['wireless']['clone'])) {
		foreach ($config['wireless']['clone'] as $clone) {
			if (empty($clone['cloneif'])) {
				continue;
			}
			if (does_interface_exist($clone['cloneif'])) {
				continue;
			}
			/* XXX: Maybe we should report any errors?! */
			interface_wireless_clone($clone['cloneif'], $clone);
		}
	}
	if (platform_booting()) {
		echo gettext("done.") . "\n";
	}

}

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

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

			if ($checkmember == 1) {
				/* XXX: It should not be possible no? */
				if (strstr($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;
					}
				}
			}
			else if ($checkmember == 2) {
				$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, $g;

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

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

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

	/* Calculate smaller mtu and enforce it */
	$smallermtu = 0;
	$foundgif = false;
	foreach ($members as $member) {
		$realif = get_real_interface($member);
		$mtu = get_interface_mtu($realif);
		if (substr($realif, 0, 3) == "gif") {
			$foundgif = true;
			if ($checkmember == 1) {
				return;
			}
			if ($mtu <= 1500) {
				continue;
			}
		}
		if ($smallermtu == 0 && !empty($mtu)) {
			$smallermtu = $mtu;
		} else if (!empty($mtu) && $mtu < $smallermtu) {
			$smallermtu = $mtu;
		}
	}
	if ($foundgif == false && $checkmember == 2) {
		return;
	}

	/* Just in case anything is not working well */
	if ($smallermtu == 0) {
		$smallermtu = 1500;
	}

	if (!empty($bridge['bridgeif'])) {
		pfSense_interface_destroy($bridge['bridgeif']);
		pfSense_interface_create($bridge['bridgeif']);
		$bridgeif = escapeshellarg($bridge['bridgeif']);
	} else {
		// if called directly, as interfaces_bridge_edit.php does, and bridgeif isn't set
		// normally set by interfaces_bridge_configure, but not upon creation of new bridge
		$bridgeif = pfSense_interface_create("bridge");
		$bridge['bridgeif'] = $bridgeif;
	}

	$bridgemtu = interface_find_child_cfgmtu($bridge['bridgeif']);
	if ($bridgemtu > $smallermtu) {
		$smallermtu = $bridgemtu;
	}

	$checklist = get_configured_interface_list();

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

	if (isset($bridge['enablestp'])) {
		interface_bridge_configure_stp($bridge);
	}

	interface_bridge_configure_advanced($bridge);

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

function interface_bridge_configure_stp($bridge) {
	if (isset($bridge['enablestp'])) {
		$bridgeif = $bridge['bridgeif'];
		/* configure spanning tree proto */
		mwexec("/sbin/ifconfig {$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));
			}
		}
	}
}

function interface_bridge_configure_advanced($bridge) {
	$bridgeif = $bridge['bridgeif'];

	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'])) {
		$spanifs = explode(",", $bridge['span']);
		foreach ($spanifs as $spanif) {
			$realif = get_real_interface($spanif);
			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}");
		}
	}
}

function interface_bridge_add_member($bridgeif, $interface, $flagsapplied = false) {
	global $config;

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

	if ($flagsapplied == false) {
		$mtu = get_interface_mtu($bridgeif);
		$mtum = get_interface_mtu($interface);
		if ($mtu != $mtum && !(substr($interface, 0, 3) == "gif" && $mtu <= 1500)) {
			pfSense_interface_mtu($interface, $mtu);
		}

		hardware_offloading_applyflags($interface);
		interfaces_bring_up($interface);
	}

	pfSense_bridge_add_member($bridgeif, $interface);
	if (is_array($config['bridges']['bridged'])) {
		foreach ($config['bridges']['bridged'] as $bridge) {
			if ($bridgeif == $bridge['bridgeif']) {
				interface_bridge_configure_stp($bridge);
				interface_bridge_configure_advanced($bridge);
			}
		}
	}
}

function interfaces_lagg_configure($realif = "") {
	global $config, $g;
	if (platform_booting()) {
		echo gettext("Configuring LAGG interfaces...");
	}
	$i = 0;
	if (is_array($config['laggs']['lagg']) && count($config['laggs']['lagg'])) {
		foreach ($config['laggs']['lagg'] as $lagg) {
			if (empty($lagg['laggif'])) {
				$lagg['laggif'] = "lagg{$i}";
			}
			if (!empty($realif) && $realif != $lagg['laggif']) {
				continue;
			}
			/* XXX: Maybe we should report any errors?! */
			interface_lagg_configure($lagg);
			$i++;
		}
	}
	if (platform_booting()) {
		echo gettext("done.") . "\n";
	}
}

function interface_lagg_configure($lagg) {
	global $config, $g;

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

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

	if (platform_booting() || !(empty($lagg['laggif']))) {
		pfSense_interface_destroy($lagg['laggif']);
		pfSense_interface_create($lagg['laggif']);
		$laggif = $lagg['laggif'];
	} else {
		$laggif = pfSense_interface_create("lagg");
	}

	/* Check if MTU was defined for this lagg interface */
	$lagg_mtu = interface_find_child_cfgmtu($laggif);
	if ($lagg_mtu == 0 &&
	    is_array($config['interfaces'])) {
		foreach ($config['interfaces'] as $tmpinterface) {
			if ($tmpinterface['if'] == $lagg['laggif'] &&
			    !empty($tmpinterface['mtu'])) {
				$lagg_mtu = $tmpinterface['mtu'];
				break;
			}
		}
	}

	/* Just in case anything is not working well */
	if ($lagg_mtu == 0) {
		$lagg_mtu = 1500;
	}

	foreach ($members as $member) {
		if (!does_interface_exist($member)) {
			continue;
		}
		/* make sure the parent interface is up */
		pfSense_interface_mtu($member, $lagg_mtu);
		interfaces_bring_up($member);
		hardware_offloading_applyflags($member);
		mwexec("/sbin/ifconfig " . escapeshellarg($laggif) . " laggport " . escapeshellarg($member));
	}

	mwexec("/sbin/ifconfig {$laggif} laggproto " . escapeshellarg($lagg['proto']));

	interfaces_bring_up($laggif);

	return $laggif;
}

function interfaces_gre_configure($checkparent = 0, $realif = "") {
	global $config;

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

			if ($checkparent == 1) {
				if (substr($gre['if'], 0, 4) == '_vip') {
					continue;
				}
				if (substr($gre['if'], 0, 5) == '_lloc') {
					continue;
				}
				if (!empty($config['interfaces'][$gre['if']]) && $config['interfaces'][$gre['if']]['ipaddrv6'] == "track6") {
					continue;
				}
			} else if ($checkparent == 2) {
				if ((substr($gre['if'], 0, 4) != '_vip' && substr($gre['if'], 0, 5) != '_lloc') &&
				    (empty($config['interfaces'][$gre['if']]) || $config['interfaces'][$gre['if']]['ipaddrv6'] != "track6")) {
					continue;
				}
			}
			/* XXX: Maybe we should report any errors?! */
			interface_gre_configure($gre);
		}
	}
}

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

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

	$realif = get_real_interface($gre['if']);
	$realifip = get_interface_ip($gre['if']);
	$realifip6 = get_interface_ipv6($gre['if']);

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

	if (platform_booting() || !(empty($gre['greif']))) {
		pfSense_interface_destroy($gre['greif']);
		pfSense_interface_create($gre['greif']);
		$greif = $gre['greif'];
	} else {
		$greif = pfSense_interface_create("gre");
	}

	/* Do not change the order here for more see gre(4) NOTES section. */
	if (is_ipaddrv6($gre['remote-addr'])) {
		mwexec("/sbin/ifconfig {$greif} inet6 tunnel {$realifip6} " . escapeshellarg($gre['remote-addr']));
	} else {
		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 ($greif) {
		interfaces_bring_up($greif);
	} else {
		log_error(gettext("Could not bring greif up -- variable not defined."));
	}

	if (isset($gre['link1']) && $gre['link1']) {
		mwexec("/sbin/route add " . escapeshellarg($gre['tunnel-remote-addr']) . "/" . escapeshellarg($gre['tunnel-remote-net']) . " " . escapeshellarg($gre['tunnel-local-addr']));
	}
	if (is_ipaddrv4($gre['tunnel-remote-addr'])) {
		file_put_contents("{$g['tmp_path']}/{$greif}_router", $gre['tunnel-remote-addr']);
	}
	if (is_ipaddrv6($gre['tunnel-remote-addr'])) {
		file_put_contents("{$g['tmp_path']}/{$greif}_routerv6", $gre['tunnel-remote-addr']);
	}

	interfaces_bring_up($greif);

	return $greif;
}

function interfaces_gif_configure($checkparent = 0, $realif = "") {
	global $config;

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

			if ($checkparent == 1) {
				if (substr($gif['if'], 0, 4) == '_vip') {
					continue;
				}
				if (substr($gif['if'], 0, 5) == '_lloc') {
					continue;
				}
				if (!empty($config['interfaces'][$gif['if']]) && $config['interfaces'][$gif['if']]['ipaddrv6'] == "track6") {
					continue;
				}
			}
			else if ($checkparent == 2) {
				if ((substr($gif['if'], 0, 4) != '_vip' && substr($gif['if'], 0, 5) != '_lloc') &&
				    (empty($config['interfaces'][$gif['if']]) || $config['interfaces'][$gif['if']]['ipaddrv6'] != "track6")) {
					continue;
				}
			}
			/* XXX: Maybe we should report any errors?! */
			interface_gif_configure($gif);
		}
	}
}

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

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

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

	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']);
	} else if (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(gettext("could not bring realif up -- variable not defined -- interface_gif_configure()"));
	}

	if (platform_booting() || !(empty($gif['gifif']))) {
		pfSense_interface_destroy($gif['gifif']);
		pfSense_interface_create($gif['gifif']);
		$gifif = $gif['gifif'];
	} else {
		$gifif = pfSense_interface_create("gif");
	}

	/* Do not change the order here for more see gif(4) NOTES section. */
	if (is_ipaddrv6($gif['remote-addr'])) {
		mwexec("/sbin/ifconfig {$gifif} inet6 tunnel {$realifip} " . escapeshellarg($gif['remote-addr']));
	} else {
		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($gif['link1'])) {
		pfSense_interface_flags($gifif, IFF_LINK1);
	}
	if (isset($gif['link2'])) {
		pfSense_interface_flags($gifif, IFF_LINK2);
	}
	if ($gifif) {
		interfaces_bring_up($gifif);
		$gifmtu = "";
		$currentgifmtu = get_interface_mtu($gifif);
		foreach ($config['interfaces'] as $tmpinterface) {
			if ($tmpinterface['if'] == $gifif) {
				if (isset($tmpinterface['mtu']) && is_numericint($tmpinterface['mtu'])) {
					$gifmtu = $tmpinterface['mtu'];
				}
			}
		}
		if (is_numericint($gifmtu)) {
			if ($gifmtu != $currentgifmtu) {
				mwexec("/sbin/ifconfig {$gifif} mtu {$gifmtu}");
			}
		}
	} else {
		log_error(gettext("could not bring gifif up -- variable not defined"));
	}

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


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

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

	interfaces_bring_up($gifif);

	return $gifif;
}

function interfaces_configure() {
	global $config, $g;

	/* Set up our loopback interface */
	interfaces_loopback_configure();

	/* create the unconfigured wireless clones */
	interfaces_create_wireless_clones();

	/* set up LAGG virtual interfaces */
	interfaces_lagg_configure();

	/* set up VLAN virtual interfaces */
	interfaces_vlan_configure();

	interfaces_qinq_configure();

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

	/* This is needed to speedup interfaces on bootup. */
	$reload = false;
	if (!platform_booting()) {
		$reload = true;
	}

	foreach ($iflist as $if => $ifname) {
		$realif = $config['interfaces'][$if]['if'];
		if (strstr($realif, "bridge")) {
			$bridge_list[$if] = $ifname;
		} else if (strstr($realif, "gre")) {
			$delayed_list[$if] = $ifname;
		} else if (strstr($realif, "gif")) {
			$delayed_list[$if] = $ifname;
		} else if (strstr($realif, "ovpn")) {
			//echo "Delaying OpenVPN interface configuration...done.\n";
			continue;
		} else if (!empty($config['interfaces'][$if]['ipaddrv6']) && $config['interfaces'][$if]['ipaddrv6'] == "track6") {
			$track6_list[$if] = $ifname;
		} else {
			if (platform_booting()) {
				printf(gettext("Configuring %s interface..."), $ifname);
			}

			if ($g['debug']) {
				log_error(sprintf(gettext("Configuring %s"), $ifname));
			}
			interface_configure($if, $reload);
			if (platform_booting()) {
				echo gettext("done.") . "\n";
			}
		}
	}

	/*
	 * 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
	 */

	/* set up GRE virtual interfaces */
	interfaces_gre_configure(1);

	/* set up GIF virtual interfaces */
	interfaces_gif_configure(1);

	/* set up BRIDGe virtual interfaces */
	interfaces_bridge_configure(1);

	foreach ($track6_list as $if => $ifname) {
		if (platform_booting()) {
			printf(gettext("Configuring %s interface..."), $ifname);
		}
		if ($g['debug']) {
			log_error(sprintf(gettext("Configuring %s"), $ifname));
		}

		interface_configure($if, $reload);

		if (platform_booting()) {
			echo gettext("done.") . "\n";
		}
	}

	/* bring up vip interfaces */
	interfaces_vips_configure();

	/* set up GRE virtual interfaces */
	interfaces_gre_configure(2);

	/* set up GIF virtual interfaces */
	interfaces_gif_configure(2);

	foreach ($delayed_list as $if => $ifname) {
		if (platform_booting()) {
			printf(gettext("Configuring %s interface..."), $ifname);
		}
		if ($g['debug']) {
			log_error(sprintf(gettext("Configuring %s"), $ifname));
		}

		interface_configure($if, $reload);

		if (platform_booting()) {
			echo gettext("done.") . "\n";
		}
	}

	/* set up BRIDGe virtual interfaces */
	interfaces_bridge_configure(2);

	foreach ($bridge_list as $if => $ifname) {
		if (platform_booting()) {
			printf(gettext("Configuring %s interface..."), $ifname);
		}
		if ($g['debug']) {
			log_error(sprintf(gettext("Configuring %s"), $ifname));
		}

		// bridge interface needs reconfigure, then re-add VIPs, to ensure find_interface_ip is correct.
		// redmine #3997
		interface_reconfigure($if, $reload);
		interfaces_vips_configure($if);

		if (platform_booting()) {
			echo gettext("done.") . "\n";
		}
	}

	/* configure interface groups */
	interfaces_group_setup();

	if (!platform_booting()) {
		/* reconfigure static routes (kernel may have deleted them) */
		system_routing_configure();

		/* reload IPsec tunnels */
		vpn_ipsec_configure();

		/* reload dhcpd (interface enabled/disabled status may have changed) */
		services_dhcpd_configure();

		if (isset($config['dnsmasq']['enable'])) {
			services_dnsmasq_configure();
		}

		if (isset($config['unbound']['enable'])) {
			services_unbound_configure();
		}
	}

	return 0;
}

function interface_reconfigure($interface = "wan", $reloadall = false) {
	interface_bring_down($interface);
	interface_configure($interface, $reloadall);
}

function interface_vip_bring_down($vip) {
	global $g;

	$vipif = get_real_interface($vip['interface']);
	switch ($vip['mode']) {
		case "proxyarp":
			if (file_exists("{$g['varrun_path']}/choparp_{$vipif}.pid")) {
				killbypid("{$g['varrun_path']}/choparp_{$vipif}.pid");
			}
			break;
		case "ipalias":
			if (does_interface_exist($vipif)) {
				if (is_ipaddrv6($vip['subnet'])) {
					mwexec("/sbin/ifconfig {$vipif} inet6 " . escapeshellarg($vip['subnet']) . " -alias");
				} else {
					pfSense_interface_deladdress($vipif, $vip['subnet']);
				}
			}
			break;
		case "carp":
			/* XXX: Is enough to delete ip address? */
			if (does_interface_exist($vipif)) {
				if (is_ipaddrv6($vip['subnet'])) {
					mwexec("/sbin/ifconfig {$vipif} inet6 " . escapeshellarg($vip['subnet']) . " delete");
				} else {
					pfSense_interface_deladdress($vipif, $vip['subnet']);
				}
			}
			break;
	}
}

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

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

	if ($g['debug']) {
		log_error(sprintf(gettext('Calling interface down for interface %1$s, destroy is %2$s'), $interface, (($destroy) ? 'true' : 'false')));
	}

	/*
	 * 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 = $config['ppps']['ppp'];
		$realif = get_real_interface($interface);
		$realifv6 = get_real_interface($interface, "inet6", true);
	} elseif (!is_array($ifacecfg)) {
		log_error(gettext("Wrong parameters used during interface_bring_down"));
		$ifcfg = $config['interfaces'][$interface];
		$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']) && !$destroy) {
							send_event("interface reconfigure {$interface}");
							break;
						}
						if (file_exists("{$g['varrun_path']}/{$ppp['type']}_{$interface}.pid")) {
							killbypid("{$g['varrun_path']}/{$ppp['type']}_{$interface}.pid");
							sleep(2);
						}
						unlink_if_exists("{$g['varetc_path']}/mpd_{$interface}.conf");
						break;
					}
				}
			}
			break;
		case "dhcp":
			kill_dhclient_process($realif);
			unlink_if_exists("{$g['varetc_path']}/dhclient_{$interface}.conf");
			if (does_interface_exist("$realif")) {
				mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " delete", true);
				interface_vip_cleanup($interface, "inet4");
				if ($destroy == true) {
					pfSense_interface_flags($realif, -IFF_UP);
				}
				mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
			}
			break;
		default:
			if (does_interface_exist("$realif")) {
				mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " delete", true);
				interface_vip_cleanup($interface, "inet4");
				if ($destroy == true) {
					pfSense_interface_flags($realif, -IFF_UP);
				}
				mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
			}
			break;
	}

	$track6 = array();
	switch ($ifcfg['ipaddrv6']) {
		case "slaac":
		case "dhcp6":
			$pidv6 = find_dhcp6c_process($realif);
			if ($pidv6) {
				posix_kill($pidv6, SIGTERM);
			}
			sleep(3);
			unlink_if_exists("{$g['varetc_path']}/dhcp6c_{$interface}.conf");
			unlink_if_exists("{$g['varetc_path']}/dhcp6c_{$interface}_script.sh");
			unlink_if_exists("{$g['varetc_path']}/rtsold_{$realifv6}_script.sh");
			if (does_interface_exist($realifv6)) {
				$ip6 = find_interface_ipv6($realifv6);
				if (is_ipaddrv6($ip6) && $ip6 != "::") {
					mwexec("/sbin/ifconfig " . escapeshellarg($realifv6) . " inet6 {$ip6} delete", true);
				}
				interface_vip_cleanup($interface, "inet6");
				if ($destroy == true) {
					pfSense_interface_flags($realif, -IFF_UP);
				}
				//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("$realif")) {
				/* destroy stf interface if tunnel is being disabled or tunnel type is being changed */
				if (($ifcfg['ipaddrv6'] == '6rd' && (!isset($config['interfaces'][$interface]['ipaddrv6']) || $config['interfaces'][$interface]['ipaddrv6'] != '6rd')) ||
				    ($ifcfg['ipaddrv6'] == '6to4' && (!isset($config['interfaces'][$interface]['ipaddrv6']) || $config['interfaces'][$interface]['ipaddrv6'] != '6to4'))) {
					$destroy = true;
				} else {
					/* get_interface_ipv6() returns empty value if interface is being disabled */
					$ip6 = get_interface_ipv6($interface);
					if (is_ipaddrv6($ip6)) {
						mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$ip6} delete", true);
					}
				}
				interface_vip_cleanup($interface, "inet6");
				if ($destroy == true) {
					pfSense_interface_flags($realif, -IFF_UP);
				}
			}
			$track6 = link_interface_to_track6($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 {$ifcfg['ipaddrv6']} delete", true);
				}
				interface_vip_cleanup($interface, "inet6");
				if ($destroy == true) {
					pfSense_interface_flags($realif, -IFF_UP);
				}
				//mwexec("/usr/sbin/arp -d -i " . escapeshellarg($realif) . " -a");
			}
			$track6 = link_interface_to_track6($interface);
			break;
	}

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

	$old_router = '';
	if (file_exists("{$g['tmp_path']}/{$realif}_router")) {
		$old_router = trim(file_get_contents("{$g['tmp_path']}/{$realif}_router"));
	}

	/* remove interface up file if it exists */
	unlink_if_exists("{$g['tmp_path']}/{$realif}up");
	unlink_if_exists("{$g['vardb_path']}/{$interface}ip");
	unlink_if_exists("{$g['vardb_path']}/{$interface}ipv6");
	unlink_if_exists("{$g['tmp_path']}/{$realif}_router");
	unlink_if_exists("{$g['tmp_path']}/{$realif}_routerv6");
	unlink_if_exists("{$g['varetc_path']}/nameserver_{$realif}");
	unlink_if_exists("{$g['varetc_path']}/searchdomain_{$realif}");

	/* 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 (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", $realif)) {
			pfSense_interface_destroy($realif);
		}
	}

	return;
}

function interfaces_carp_set_maintenancemode($carp_maintenancemode) {
	global $config;
	if (isset($config["virtualip_carp_maintenancemode"]) && $carp_maintenancemode == false) {
		unset($config["virtualip_carp_maintenancemode"]);
		write_config("Leave CARP maintenance mode");
	} else if (!isset($config["virtualip_carp_maintenancemode"]) && $carp_maintenancemode == true) {
		$config["virtualip_carp_maintenancemode"] = true;
		write_config(gettext("Enter CARP maintenance mode"));
	}

	$viparr = &$config['virtualip']['vip'];
	foreach ($viparr as $vip) {
		if ($vip['mode'] == "carp") {
			interface_carp_configure($vip);
		}
	}
}

function interface_isppp_type($interface) {
	global $config;

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

	switch ($config['interfaces'][$interface]['ipaddr']) {
		case 'pptp':
		case 'l2tp':
		case 'pppoe':
		case 'ppp':
			return true;
			break;
		default:
			return false;
			break;
	}
}

function interfaces_ptpid_used($ptpid) {
	global $config;

	if (is_array($config['ppps']['ppp'])) {
		foreach ($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;
}

function getMPDCRONSettings($pppif) {
	global $config;

	$cron_cmd_file = "{$g['varetc_path']}/pppoe_restart_{$pppif}";
	if (is_array($config['cron']['item'])) {
		foreach ($config['cron']['item'] as $i => $item) {
			if (stripos($item['command'], $cron_cmd_file) !== false) {
				return array("ID" => $i, "ITEM" => $item);
			}
		}
	}

	return NULL;
}

function handle_pppoe_reset($post_array) {
	global $config, $g;

	$pppif = "{$post_array['type']}{$post_array['ptpid']}";
	$cron_cmd_file = "{$g['varetc_path']}/pppoe_restart_{$pppif}";

	if (!is_array($config['cron']['item'])) {
		$config['cron']['item'] = array();
	}

	$itemhash = getMPDCRONSettings($pppif);

	// reset cron items if necessary and return
	if (empty($post_array['pppoe-reset-type'])) {
		if (isset($itemhash)) {
			unset($config['cron']['item'][$itemhash['ID']]);
		}
		sigkillbypid("{$g['varrun_path']}/cron.pid", "HUP");
		return;
	}

	if (empty($itemhash)) {
		$itemhash = array();
	}
	$item = array();
	if (isset($post_array['pppoe-reset-type']) && $post_array['pppoe-reset-type'] == "custom") {
		$item['minute'] = $post_array['pppoe_resetminute'];
		$item['hour'] = $post_array['pppoe_resethour'];
		if (isset($post_array['pppoe_resetdate']) && $post_array['pppoe_resetdate'] <> "") {
			$date = explode("/", $post_array['pppoe_resetdate']);
			$item['mday'] = $date[1];
			$item['month'] = $date[0];
		} else {
			$item['mday'] = "*";
			$item['month'] = "*";
		}
		$item['wday'] = "*";
		$item['who'] = "root";
		$item['command'] = $cron_cmd_file;
	} else if (isset($post_array['pppoe-reset-type']) && $post_array['pppoe-reset-type'] == "preset") {
		switch ($post_array['pppoe_pr_preset_val']) {
			case "monthly":
				$item['minute'] = "0";
				$item['hour'] = "0";
				$item['mday'] = "1";
				$item['month'] = "*";
				$item['wday'] = "*";
				break;
			case "weekly":
				$item['minute'] = "0";
				$item['hour'] = "0";
				$item['mday'] = "*";
				$item['month'] = "*";
				$item['wday'] = "0";
				break;
			case "daily":
				$item['minute'] = "0";
				$item['hour'] = "0";
				$item['mday'] = "*";
				$item['month'] = "*";
				$item['wday'] = "*";
				break;
			case "hourly":
				$item['minute'] = "0";
				$item['hour'] = "*";
				$item['mday'] = "*";
				$item['month'] = "*";
				$item['wday'] = "*";
				break;
		} // end switch
		$item['who'] = "root";
		$item['command'] = $cron_cmd_file;
	}
	if (empty($item)) {
		return;
	}
	if (isset($itemhash['ID'])) {
		$config['cron']['item'][$itemhash['ID']] = $item;
	} else {
		$config['cron']['item'][] = $item;
	}
}

/*
 * 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, $g;

	/* 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.
	if (!is_dir("/var/spool/lock")) {
		mkdir("/var/spool/lock", 0777, true);
	}
	// mpd5 modem chat script expected in the same directory as the mpd_xxx.conf files
	if (!file_exists("{$g['varetc_path']}/mpd.script")) {
		@symlink("/usr/local/sbin/mpd.script", "{$g['varetc_path']}/mpd.script");
	}

	if (is_array($config['ppps']['ppp']) && count($config['ppps']['ppp'])) {
		foreach ($config['ppps']['ppp'] as $pppid => $ppp) {
			if ($ifcfg['if'] == $ppp['if']) {
				break;
			}
		}
	}
	if (!$ppp || $ifcfg['if'] != $ppp['if']) {
		log_error(sprintf(gettext("Can't find PPP config for %s in interface_ppps_configure()."), $ifcfg['if']));
		return 0;
	}
	$pppif = $ifcfg['if'];
	if ($ppp['type'] == "ppp") {
		$type = "modem";
	} else {
		$type = $ppp['type'];
	}
	$upper_type = strtoupper($ppp['type']);

	/* XXX: This does not make sense and may create trouble
	 * comment it for now to be removed later on.
	if (platform_booting()) {
		$descr = isset($ifcfg['descr']) ? $ifcfg['descr'] : strtoupper($interface);
		echo "starting {$pppif} link...";
		if (isvalidpid("{$g['varrun_path']}/{$ppp['type']}_{$interface}.pid"))
			return 0;
	}
	*/

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

	/* 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);
				pfSense_ngctl_attach(".", $port);
				/* Enable setautosrc to automatically change mac address if parent interface's changes */
				mwexec("/usr/sbin/ngctl msg {$port}: setautosrc 1");
				break;
			case "pptp":
			case "l2tp":
				/* configure interface */
				if (is_ipaddr($localips[$pid])) {
					// Manually configure interface IP/subnet
					pfSense_interface_setaddress($port, "{$localips[$pid]}/{$subnets[$pid]}");
					interfaces_bring_up($port);
				} else if (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(sprintf(gettext("Could not get a Local IP address for PPTP/L2TP link on %s in interfaces_ppps_configure. Using 0.0.0.0 ip!"), $port));
					$localips[$pid] = "0.0.0.0";
				}
				if (!is_ipaddr($gateways[$pid])) {
					log_error(sprintf(gettext('Could not get a PPTP/L2TP Remote IP address from %1$s for %2$s in interfaces_ppps_configure.'), $dhcp_gateway, $gway));
					return 0;
				}
				pfSense_ngctl_attach(".", $port);
				break;
			case "ppp":
				if (!file_exists("{$port}")) {
					log_error(sprintf(gettext("Device %s does not exist. PPP link cannot start without the modem device."), $port));
					return 0;
				}
				break;
			default:
				log_error(sprintf(gettext("Unknown %s configured as ppp interface."), $type));
				break;
		}
	}

	if (is_array($ports) && count($ports) > 1) {
		$multilink = "enable";
	} else {
		$multilink = "disable";
	}

	if ($type == "modem") {
		if (is_ipaddr($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}";
		}
		$ranges = "{$localip}/0 {$gateway}/0";

		if (empty($ppp['apnum'])) {
			$ppp['apnum'] = 1;
		}
	} else {
		$ranges = "0.0.0.0/0 0.0.0.0/0";
	}

	if (isset($ppp['ondemand'])) {
		$ondemand = "enable";
	} else {
		$ondemand = "disable";
	}
	if (!isset($ppp['idletimeout'])) {
		$ppp['idletimeout'] = 0;
	}

	if (empty($ppp['username']) && $type == "modem") {
		$ppp['username'] = "user";
		$ppp['password'] = "none";
	}
	if (empty($ppp['password']) && $type == "modem") {
		$passwd = "none";
	} else {
		$passwd = base64_decode($ppp['password']);
	}

	$bandwidths = explode(',', $ppp['bandwidth']);
	$defaultmtu = "1492";
	if (!empty($ifcfg['mtu'])) {
		$defaultmtu = intval($ifcfg['mtu']);
	}
	if (isset($ppp['mtu'])) {
		$mtus = explode(',', $ppp['mtu']);
	}
	if (isset($ppp['mru'])) {
		$mrus = explode(',', $ppp['mru']);
	}
	if (isset($ppp['mrru'])) {
		$mrrus = explode(',', $ppp['mrru']);
	}

	// 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 {$pppif}

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

/* Omit this, we maintain the default route by other means, and it causes problems with
 * default gateway switching. See redmine #1837 for original issue
 * re-enabling this for now to fix issue with missing default gateway with PPPoE in some 
 * edge case. redmine #6495 open to address. 
 */
	if (($interface == "wan" && $founddefaultgw == false) || $setdefaultgw == true) {
		$setdefaultgw = true;
		$mpdconf .= <<<EOD
	set iface route default

EOD;
	}
	$mpdconf .= <<<EOD
	set iface {$ondemand} on-demand
	set iface idle {$ppp['idletimeout']}

EOD;

	if (isset($ppp['ondemand'])) {
		$mpdconf .= <<<EOD
	set iface addrs 10.10.1.1 10.10.1.2

EOD;
	}

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

EOD;

	$mpdconf .= <<<EOD
	set iface up-script /usr/local/sbin/ppp-linkup
	set iface down-script /usr/local/sbin/ppp-linkdown
	set ipcp ranges {$ranges}

EOD;
	if (isset($ppp['vjcomp'])) {
		$mpdconf .= <<<EOD
	set ipcp no vjcomp

EOD;
	}

	if (isset($config['system']['dnsallowoverride'])) {
		$mpdconf .= <<<EOD
	set ipcp enable req-pri-dns
	set ipcp enable req-sec-dns

EOD;
	}

	if (!isset($ppp['verbose_log'])) {
		$mpdconf .= <<<EOD
	#log -bund -ccp -chat -iface -ipcp -lcp -link

EOD;
	}

	foreach ($ports as $pid => $port) {
		$port = get_real_interface($port);
		$mpdconf .= <<<EOD

	create link static {$interface}_link{$pid} {$type}
	set link action bundle {$interface}
	set link {$multilink} multilink
	set link keep-alive 10 60
	set link max-redial 0

EOD;
		if (isset($ppp['shortseq'])) {
			$mpdconf .= <<<EOD
	set link no shortseq

EOD;
		}

		if (isset($ppp['acfcomp'])) {
			$mpdconf .= <<<EOD
	set link no acfcomp

EOD;
		}

		if (isset($ppp['protocomp'])) {
			$mpdconf .= <<<EOD
	set link no protocomp

EOD;
		}

		$mpdconf .= <<<EOD
	set link disable chap pap
	set link accept chap pap eap
	set link disable incoming

EOD;


		if (!empty($bandwidths[$pid])) {
			$mpdconf .= <<<EOD
	set link bandwidth {$bandwidths[$pid]}

EOD;
		}

		if (empty($mtus[$pid])) {
			$mtus[$pid] = $defaultmtu;
		}
		if ($type == "pppoe") {
			if ($mtus[$pid] > (get_interface_mtu($port) - 8)) {
				$mtus[$pid] = get_interface_mtu($port) - 8;
			}
		}
		if (! ($type == "pppoe" && $mtus[$pid] > 1492) ) {
			// N.B. MTU for PPPoE with MTU > 1492 is set using pppoe max-payload - see below
			$mpdconf .= <<<EOD
	set link mtu {$mtus[$pid]}

EOD;
		}

		if (!empty($mrus[$pid])) {
			$mpdconf .= <<<EOD
	set link mru {$mrus[$pid]}

EOD;
		}

		if (!empty($mrrus[$pid])) {
			$mpdconf .= <<<EOD
	set link mrru {$mrrus[$pid]}

EOD;
		}

		$mpdconf .= <<<EOD
	set auth authname "{$ppp['username']}"
	set auth password {$passwd}

EOD;
		if ($type == "modem") {
			$mpdconf .= <<<EOD
	set modem device {$ppp['ports']}
	set modem script DialPeer
	set modem idle-script Ringback
	set modem watch -cd
	set modem var \$DialPrefix "DT"
	set modem var \$Telephone "{$ppp['phone']}"

EOD;
		}
		if (isset($ppp['connect-timeout']) && $type == "modem") {
			$mpdconf .= <<<EOD
	set modem var \$ConnectTimeout "{$ppp['connect-timeout']}"

EOD;
		}
		if (isset($ppp['initstr']) && $type == "modem") {
			$initstr = base64_decode($ppp['initstr']);
			$mpdconf .= <<<EOD
	set modem var \$InitString "{$initstr}"

EOD;
		}
		if (isset($ppp['simpin']) && $type == "modem") {
			if ($ppp['pin-wait'] == "") {
				$ppp['pin-wait'] = 0;
			}
			$mpdconf .= <<<EOD
	set modem var \$SimPin "{$ppp['simpin']}"
	set modem var \$PinWait "{$ppp['pin-wait']}"

EOD;
		}
		if (isset($ppp['apn']) && $type == "modem") {
			$mpdconf .= <<<EOD
	set modem var \$APN "{$ppp['apn']}"
	set modem var \$APNum "{$ppp['apnum']}"

EOD;
		}
		if ($type == "pppoe") {
			// Send a null service name if none is set.
			$provider = isset($ppp['provider']) ? $ppp['provider'] : "";
			$mpdconf .= <<<EOD
	set pppoe service "{$provider}"

EOD;
		}
		if ($type == "pppoe" && $mtus[$pid] > 1492) {
			$mpdconf .= <<<EOD
	set pppoe max-payload {$mtus[$pid]}

EOD;
		}
		if ($type == "pppoe") {
			$mpdconf .= <<<EOD
	set pppoe iface {$port}

EOD;
		}

		if ($type == "pptp" || $type == "l2tp") {
			$mpdconf .= <<<EOD
	set {$type} self {$localips[$pid]}
	set {$type} peer {$gateways[$pid]}

EOD;
		}

		$mpdconf .= "\topen\n";
	} //end foreach ($port)


	/* 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("{$g['conf_path']}/mpd_{$interface}.conf")) {
		@symlink("{$g['conf_path']}/mpd_{$interface}.conf", "{$g['varetc_path']}/mpd_{$interface}.conf");
	} else {
		$fd = fopen("{$g['varetc_path']}/mpd_{$interface}.conf", "w");
		if (!$fd) {
			log_error(sprintf(gettext('Error: cannot open mpd_%1$s.conf in interface_ppps_configure().%2$s'), $interface, "\n"));
			return 0;
		}
		// Write out mpd_ppp.conf
		fwrite($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($ppp['uptime'])) {
		if (!file_exists("/conf/{$pppif}.log")) {
			conf_mount_rw();
			file_put_contents("/conf/{$pppif}.log", '');
			conf_mount_ro();
		}
	} else {
		if (file_exists("/conf/{$pppif}.log")) {
			conf_mount_rw();
			@unlink("/conf/{$pppif}.log");
			conf_mount_ro();
		}
	}

	/* clean up old lock files */
	foreach ($ports as $port) {
		if (file_exists("{$g['var_path']}/spool/lock/LCK..{$port}")) {
			unlink("{$g['var_path']}/spool/lock/LCK..{$port}");
		}
	}

	/* Set temporary bogon (RFC 5737) IPv4 addresses to work round mpd5 IPv6CP issue causing */
	/* random IPv6 interface identifier during boot. More details at */
	/* https://forum.pfsense.org/index.php?topic=101967.msg570519#msg570519 */
	if (platform_booting() && is_array($config['interfaces'])) {
		$count = 0;
		foreach ($config['interfaces'] as $tempifacename => $tempiface) {
			if ((isset($tempiface['if'])) && (isset($tempiface['ipaddr']) || isset($tempiface['ipaddrv6'])) && !interface_isppp_type($tempifacename)) {
				$tempaddr[$count]['if'] = $tempiface['if'];
				$tempaddr[$count]['ipaddr'] = '192.0.2.' . strval (10 + ($count * 2)) . '/31';
				mwexec('/sbin/ifconfig ' . escapeshellarg($tempaddr[$count]['if']) . ' inet ' . escapeshellarg($tempaddr[$count]['ipaddr']) . ' alias', true);
				$count++;
			}
			// Maximum /31 is is x.y.z.254/31
			if ($count > 122) {
				break;
			}
		}
		unset($count);
	}

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

	// Check for PPPoE periodic reset request
	if ($type == "pppoe") {
		if (!empty($ppp['pppoe-reset-type'])) {
			interface_setup_pppoe_reset_file($ppp['if'], $interface);
		} else {
			interface_setup_pppoe_reset_file($ppp['if']);
		}
	}
	/* wait for upto 10 seconds for the interface to appear (ppp(oe)) */
	$i = 0;
	while ($i < 3) {
		sleep(10);
		if (does_interface_exist($ppp['if'], true)) {
			break;
		}
		$i++;
	}

	/* Remove all temporary bogon IPv4 addresses */
	if (is_array($tempaddr)) {
		foreach ($tempaddr as $tempiface) {
			if (isset($tempiface['if']) && isset($tempiface['ipaddr'])) {
				mwexec('/sbin/ifconfig ' . escapeshellarg($tempiface['if']) . ' inet ' . escapeshellarg($tempiface['ipaddr']) . ' -alias', true);
			}
		}
		unset ($tempaddr);
	}

	/* 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("/usr/sbin/usbconfig | /usr/bin/egrep -ie '(huawei)'", $usbmodemoutput);
	mwexec("/bin/ps auxww | /usr/bin/grep \"{$interface}\" | /usr/bin/grep \"[3]gstats\" | /usr/bin/awk '{print $2}' | /usr/bin/xargs kill");
	foreach ($ports as $port) {
		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 ($mondev != '') {
			log_error(sprintf(gettext('Starting 3gstats.php on device \'%1$s\' for interface \'%2$s\''), $mondev, $interface));
			mwexec_bg("/usr/local/bin/3gstats.php {$mondev} {$interface}");
		}
	}

	return 1;
}

function interfaces_sync_setup() {
	global $g, $config;

	if (isset($config['system']['developerspew'])) {
		$mt = microtime();
		echo "interfaces_sync_setup() being called $mt\n";
	}

	if (platform_booting()) {
		echo gettext("Configuring CARP settings...");
		mute_kernel_msgs();
	}

	/* suck in configuration items */
	if ($config['hasync']) {
		$pfsyncenabled = $config['hasync']['pfsyncenabled'];
		$pfsyncinterface = $config['hasync']['pfsyncinterface'];
		$pfsyncpeerip = $config['hasync']['pfsyncpeerip'];
	} else {
		unset($pfsyncinterface);
		unset($pfsyncenabled);
	}

	set_sysctl(array(
		"net.inet.carp.preempt" => "1",
		"net.inet.carp.log" => "1")
	);

	if (!empty($pfsyncinterface)) {
		$carp_sync_int = get_real_interface($pfsyncinterface);
	} else {
		unset($carp_sync_int);
	}

	/* setup pfsync interface */
	if (isset($carp_sync_int) and isset($pfsyncenabled)) {
		if (is_ipaddr($pfsyncpeerip)) {
			$syncpeer = "syncpeer {$pfsyncpeerip}";
		} else {
			$syncpeer = "-syncpeer";
		}

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

		sleep(1);

		/* XXX: Handle an issue with pfsync(4) and carp(4). In a cluster carp will come up before pfsync(4) has updated and so will cause issues
		 * for existing sessions.
		 */
		log_error(gettext("waiting for pfsync..."));
		$i = 0;
		while (intval(trim(`/sbin/ifconfig pfsync0 | /usr/bin/grep 'syncok: 0' | /usr/bin/grep -v grep | /usr/bin/wc -l`)) == 0 && $i < 30) {
			$i++;
			sleep(1);
		}
		log_error(sprintf(gettext("pfsync done in %s seconds."), $i));
		log_error(gettext("Configuring CARP settings finalize..."));
	} else {
		mwexec("/sbin/ifconfig pfsync0 -syncdev -syncpeer down", false);
	}

	$carplist = get_configured_vip_list('all', VIP_CARP);
	if (isset($carplist) && is_array($carplist) && count($carplist) > 0) {
		set_single_sysctl("net.inet.carp.allow", "1");
	} else {
		set_single_sysctl("net.inet.carp.allow", "0");
	}

	if (platform_booting()) {
		unmute_kernel_msgs();
		echo gettext("done.") . "\n";
	}
}

function interface_proxyarp_configure($interface = "") {
	global $config, $g;
	if (isset($config['system']['developerspew'])) {
		$mt = microtime();
		echo "interface_proxyarp_configure() being called $mt\n";
	}

	/* kill any running choparp */
	if (empty($interface)) {
		killbyname("choparp");
	} else {
		$vipif = get_real_interface($interface);
		if (file_exists("{$g['varrun_path']}/choparp_{$vipif}.pid")) {
			killbypid("{$g['varrun_path']}/choparp_{$vipif}.pid");
		}
	}

	$paa = array();
	if (!empty($config['virtualip']) && is_array($config['virtualip']['vip'])) {

		/* group by interface */
		foreach ($config['virtualip']['vip'] as $vipent) {
			if ($vipent['mode'] === "proxyarp") {
				if ($vipent['interface']) {
					$proxyif = $vipent['interface'];
				} else {
					$proxyif = "wan";
				}

				if (!empty($interface) && $interface != $proxyif) {
					continue;
				}

				if (!is_array($paa[$proxyif])) {
					$paa[$proxyif] = array();
				}

				$paa[$proxyif][] = $vipent;
			}
		}
	}

	if (!empty($interface)) {
		if (is_array($paa[$interface])) {
			$paaifip = get_interface_ip($interface);
			if (!is_ipaddr($paaifip)) {
				return;
			}
			$args = get_real_interface($interface) . " auto";
			foreach ($paa[$interface] as $paent) {
				if (isset($paent['subnet'])) {
					$args .= " " . escapeshellarg("{$paent['subnet']}/{$paent['subnet_bits']}");
				} else if (isset($paent['range'])) {
					$args .= " " . escapeshellarg($paent['range']['from'] . "-" . $paent['range']['to']);
				}
			}
			mwexec_bg("/usr/local/sbin/choparp " . $args);
		}
	} else if (count($paa) > 0) {
		foreach ($paa as $paif => $paents) {
			$paaifip = get_interface_ip($paif);
			if (!is_ipaddr($paaifip)) {
				continue;
			}
			$args = get_real_interface($paif) . " auto";
			foreach ($paents as $paent) {
				if (isset($paent['subnet'])) {
					$args .= " " . escapeshellarg("{$paent['subnet']}/{$paent['subnet_bits']}");
				} else if (isset($paent['range'])) {
					$args .= " " . escapeshellarg($paent['range']['from'] . "-" . $paent['range']['to']);
				}
			}
			mwexec_bg("/usr/local/sbin/choparp " . $args);
		}
	}
}

function interface_vip_cleanup($interface, $inet = "all", $type = VIP_ALL) {
	global $g, $config;

	if (is_array($config['virtualip']['vip'])) {
		foreach ($config['virtualip']['vip'] as $vip) {

			$iface = $vip['interface'];
			if (substr($iface, 0, 4) == "_vip")
				$iface = get_configured_vip_interface($vip['interface']);
			if ($iface != $interface)
				continue;
			if ($type == VIP_CARP) {
				if ($vip['mode'] != "carp")
					continue;
			} elseif ($type == VIP_IPALIAS) {
				if ($vip['mode'] != "ipalias")
					continue;
			} else {
				if ($vip['mode'] != "carp" && $vip['mode'] != "ipalias")
					continue;
			}

			if ($inet == "inet6" && is_ipaddrv6($vip['subnet']))
				interface_vip_bring_down($vip);
			else if ($inet == "inet4" && is_ipaddrv4($vip['subnet']))
				interface_vip_bring_down($vip);
			else if ($inet == "all")
				interface_vip_bring_down($vip);
		}
	}
}

function interfaces_vips_configure($interface = "") {
	global $g, $config;
	if (isset($config['system']['developerspew'])) {
		$mt = microtime();
		echo "interfaces_vips_configure() being called $mt\n";
	}
	$paa = array();
	if (is_array($config['virtualip']['vip'])) {
		$carp_setuped = false;
		$anyproxyarp = false;
		foreach ($config['virtualip']['vip'] as $vip) {
			switch ($vip['mode']) {
				case "proxyarp":
					/* nothing it is handled on interface_proxyarp_configure() */
					if ($interface <> "" && $vip['interface'] <> $interface) {
						continue;
					}
					$anyproxyarp = true;
					break;
				case "ipalias":
					$iface = $vip['interface'];
					if (substr($iface, 0, 4) == "_vip")
						$iface = get_configured_vip_interface($vip['interface']);
					if ($interface <> "" && $iface <> $interface) {
						continue;
					}
					interface_ipalias_configure($vip);
					break;
				case "carp":
					if ($interface <> "" && $vip['interface'] <> $interface) {
						continue;
					}
					if ($carp_setuped == false) {
						$carp_setuped = true;
					}
					interface_carp_configure($vip);
					break;
			}
		}
		if ($carp_setuped == true) {
			interfaces_sync_setup();
		}
		if ($anyproxyarp == true) {
			interface_proxyarp_configure();
		}
	}
}

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

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

	$realif = get_real_interface("_vip{$vip['uniqid']}");
	if ($realif != "lo0") {
		$if = convert_real_interface_to_friendly_interface_name($realif);
		if (!isset($config['interfaces'][$if])) {
			return;
		}

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

	$af = 'inet';
	if (is_ipaddrv6($vip['subnet'])) {
		$af = 'inet6';
	}
	$iface = $vip['interface'];
	$vhid = '';
	if (substr($vip['interface'], 0, 4) == "_vip") {
		$carpvip = get_configured_vip($vip['interface']);
		$iface = $carpvip['interface'];
		$vhid = "vhid {$carpvip['vhid']}";
	}
	mwexec("/sbin/ifconfig " . escapeshellarg($realif) ." {$af} ". escapeshellarg($vip['subnet']) ."/" . escapeshellarg($vip['subnet_bits']) . " alias {$vhid}");
	unset($iface, $af, $realif, $carpvip, $vhid);
}

function interface_carp_configure(&$vip) {
	global $config, $g;
	if (isset($config['system']['developerspew'])) {
		$mt = microtime();
		echo "interface_carp_configure() being called $mt\n";
	}

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

	/* NOTE: Maybe its useless nowadays */
	$realif = get_real_interface($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;
	}

	$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($vip['vhid']));
	} else if (is_ipaddrv6($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, $g;
	/*   Check to see if interface has been cloned as of yet.
	 *   If it has not been cloned then go ahead and clone it.
	 */
	$needs_clone = false;
	if (is_array($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(gettext("Interface %s changed to hostap mode"), $realif));
			$needs_clone = true;
		}
		if (($wlcfg_mode == "adhoc") && (!preg_match("/adhoc/si", $ifconfig_str))) {
			log_error(sprintf(gettext("Interface %s changed to adhoc mode"), $realif));
			$needs_clone = true;
		}
		if (($wlcfg_mode == "bss") && (preg_match("/hostap|adhoc/si", $ifconfig_str))) {
			log_error(sprintf(gettext("Interface %s changed to infrastructure mode"), $realif));
			$needs_clone = true;
		}
	} else {
		$needs_clone = true;
	}

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

		log_error(sprintf(gettext("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(gettext('Failed to clone interface %1$s with error code %2$s, output %3$s'), $baseif, $ret, $out[0]));
			return false;
		}
		$newif = trim($out[0]);
		// Rename the interface to {$parentnic}_wlan{$number}#: EX: ath0_wlan0
		pfSense_interface_rename($newif, $realif);
		file_put_contents("{$g['tmp_path']}/{$realif}_oldmac", get_interface_mac($realif));
	}
	return true;
}

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

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

	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];
						} else if (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'][$setting];
						} else if (isset($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];
				} else if (isset($config['wireless']['interfaces'][$baseif][$setting])) {
					unset($config['wireless']['interfaces'][$baseif][$setting]);
				}
			} else if (isset($config['wireless']['interfaces'][$baseif][$setting])) {
				if (isset($config['wireless']['interfaces'][$baseif][$setting])) {
					$ifcfg['wireless'][$setting] = $config['wireless']['interfaces'][$baseif][$setting];
				} else if (isset($ifcfg['wireless'][$setting])) {
					unset($ifcfg['wireless'][$setting]);
				}
			}
		}
	}

	// Sync the mode on the clone creation page with the configured mode on the interface
	if (interface_is_wireless_clone($ifcfg['if']) && isset($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, $g;

	/*    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_if_exists("{$g['tmp_path']}/{$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);

	$fd_set = fopen("{$g['tmp_path']}/{$if}_setup.sh", "w");
	fwrite($fd_set, "#!/bin/sh\n");
	fwrite($fd_set, "# {$g['product_name']} wireless configuration script.\n\n");

	$wlan_setup_log = fopen("{$g['tmp_path']}/{$if}_setup.log", "w");

	/* 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", "", $wlcfg['standard']);
	/* skip mode entirely for "auto" */
	if ($wlcfg['standard'] != "auto") {
		$wlcmd[] = "mode " . escapeshellarg($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 Distance value */
	if ($wlcfg['distance']) {
		$distance = escapeshellarg($wlcfg['distance']);
	}

	/* 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 necessary 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 txpower setting */
	// or don't. this has issues at the moment.
	/*
	if ($wlcfg['txpower'] <> "" && is_numeric($wlcfg['txpower'])) {
		$wlcmd[] = "txpower " . escapeshellarg($wlcfg['txpower']);
	}*/

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

	/* Enable wpa if it's configured. No WEP support anymore. */
	if (isset($wlcfg['wpa']['enable'])) {
		$wlcmd[] = "authmode wpa wepmode off ";
	} else {
		$wlcmd[] = "authmode open wepmode off ";
	}

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

	/* generate wpa_supplicant/hostap config if wpa is enabled */
	conf_mount_rw();

	switch ($wlcfg['mode']) {
		case 'bss':
			if (isset($wlcfg['wpa']['enable'])) {
				$wpa .= <<<EOD
ctrl_interface={$g['varrun_path']}/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("{$g['varetc_path']}/wpa_supplicant_{$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={$g['tmp_path']}/hostapd_{$if}.dump
ctrl_interface={$g['varrun_path']}/hostapd
ctrl_interface_group=wheel
#accept_mac_file={$g['tmp_path']}/hostapd_{$if}.accept
#deny_mac_file={$g['tmp_path']}/hostapd_{$if}.deny
#macaddr_acl={$wlcfg['wpa']['macaddr_acl']}
ssid={$wlcfg['ssid']}
debug={$wlcfg['wpa']['debug_mode']}
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'])) {
					$wpa .= <<<EOD
# Enable the next lines for preauth when roaming. Interface = wired or wireless interface talking to the AP to roam from/to
rsn_preauth=1
rsn_preauth_interfaces={$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("{$g['varetc_path']}/hostapd_{$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");
		}
	}

	/* set ack timers according to users preference (if he/she has any) */
	if ($distance) {
		fwrite($fd_set, "# Enable ATH distance settings\n");
		fwrite($fd_set, "/sbin/athctrl.sh -i {$baseif} -d {$distance}\n");
	}

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

			fwrite($fd_set, "{$hostapd} -B -P {$g['varrun_path']}/hostapd_{$if}.pid {$g['varetc_path']}/hostapd_{$if}.conf\n");

			/* add line to script to restore spoofed mac after running hostapd */
			if (file_exists("{$g['tmp_path']}/{$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);
	conf_mount_ro();

	/* 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)) {
		$reg_changing = true;
	} else if ($wlcfg['regdomain'] && !preg_match("/\sregdomain\s+{$wlcfg['regdomain']}\s/si", $ifconfig_str)) {
		$reg_changing = true;
	} else if ($wlcfg['regcountry'] && !preg_match("/\scountry\s+{$wlcfg['regcountry']}\s/si", $ifconfig_str)) {
		$reg_changing = true;
	} else if ($wlcfg['reglocation'] == 'anywhere' && preg_match("/\s(indoor|outdoor)\s/si", $ifconfig_str)) {
		$reg_changing = true;
	} else if ($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($config['wireless']['clone']) && is_array($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 */
		$clones_up = array();
		foreach ($clone_list as $clone_if) {
			$clone_status = pfSense_get_interface_addresses($clone_if);
			if ($clone_status['status'] == 'up') {
				$clones_up[] = $clone_if;
				mwexec("{$ifconfig} " . escapeshellarg($clone_if) . " down");
			}
		}

		/* apply the regulatory settings */
		mwexec("{$ifconfig} " . escapeshellarg($if) . " {$wlregcmd_args}");
		fwrite($wlan_setup_log, "$ifconfig" . escapeshellarg($if) . "$wlregcmd_args \n");

		/* bring the clones back up that were previously up */
		foreach ($clones_up as $clone_if) {
			interfaces_bring_up($clone_if);

			/*
			 * 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'][$friendly_if]['wireless']['wpa']['enable']))) {
					mwexec("/bin/sh {$g['tmp_path']}/" . escapeshellarg($clone_if) . "_setup.sh");
				}
			}
		}
	}

	/* 20150318 cmb - Note: the below no longer appears to be true on FreeBSD 10.x, so don't set
	 * mode twice (for now at least). This can be removed entirely in the future if no problems are found

	 * 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));
	//fwrite($wlan_setup_log, "/sbin/ifconfig " . escapeshellarg($if) . " mode " . escapeshellarg($standard) . "\n");

	/* configure wireless */
	$wlcmd_args = implode(" ", $wlcmd);
	mwexec("/sbin/ifconfig " . escapeshellarg($if) . " " . $wlcmd_args, false);
	fwrite($wlan_setup_log, "/sbin/ifconfig " . escapeshellarg($if) . " " . "$wlcmd_args \n");
	fclose($wlan_setup_log);

	unset($wlcmd_args, $wlcmd);


	sleep(1);
	/* execute hostapd and wpa_supplicant if required in shell */
	mwexec("/bin/sh {$g['tmp_path']}/" . escapeshellarg($if) . "_setup.sh");

	return 0;

}

function kill_hostapd($interface) {
	global $g;

	if (isvalidpid("{$g['varrun_path']}/hostapd_{$interface}.pid")) {
		return killbypid("{$g['varrun_path']}/hostapd_{$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;
	}

	$i = 0;
	while ((($pid = find_dhclient_process($interface)) != 0) && ($i < 3)) {
		/* 3rd time make it die for sure */
		$sig = ($i == 2 ? SIGKILL : SIGTERM);
		posix_kill($pid, $sig);
		sleep(1);
		$i++;
	}
	unset($i);
}

function find_dhcp6c_process($interface) {
	global $g;

	if ($interface && isvalidpid("{$g['varrun_path']}/dhcp6c_{$interface}.pid")) {
		$pid = trim(file_get_contents("{$g['varrun_path']}/dhcp6c_{$interface}.pid"), " \n");
	} else {
		return(false);
	}

	return intval($pid);
}

function interface_virtual_create($interface) {
	global $config;

	if (strstr($interface, "_vlan")) {
		interfaces_vlan_configure($vlan);
	} else if (substr($interface, 0, 3) == "gre") {
		interfaces_gre_configure(0, $interface);
	} else if (substr($interface, 0, 3) == "gif") {
		interfaces_gif_configure(0, $interface);
	} else if (substr($interface, 0, 5) == "ovpns") {
		if (is_array($config['openvpn']) && is_array($config['openvpn']['openvpn-server'])) {
			foreach ($config['openvpn']['openvpn-server'] as $server) {
				if ($interface == "ovpns{$server['vpnid']}") {
					if (!function_exists('openvpn_resync')) {
						require_once('openvpn.inc');
					}
					log_error(sprintf(gettext("OpenVPN: Resync server %s"), $server['description']));
					openvpn_resync('server', $server);
				}
			}
			unset($server);
		}
	} else if (substr($interface, 0, 5) == "ovpnc") {
		if (is_array($config['openvpn']) && is_array($config['openvpn']['openvpn-client'])) {
			foreach ($config['openvpn']['openvpn-client'] as $client) {
				if ($interface == "ovpnc{$client['vpnid']}") {
					if (!function_exists('openvpn_resync')) {
						require_once('openvpn.inc');
					}
					log_error(sprintf(gettext("OpenVPN: Resync client %s"), $client['description']));
					openvpn_resync('client', $client);
				}
			}
			unset($client);
		}
	} else if (substr($interface, 0, 4) == "lagg") {
		interfaces_lagg_configure($interface);
	} else if (substr($interface, 0, 6) == "bridge") {
		interfaces_bridge_configure(0, $interface);
	}
}

function interface_vlan_mtu_configured($iface) {
	global $config;

	$mtu = 0;
	if (is_array($config['vlans']) && is_array($config['vlans']['vlan'])) {
		foreach ($config['vlans']['vlan'] as $vlan) {

			if ($vlan['vlanif'] != $iface)
				continue;

			$assignedport = convert_real_interface_to_friendly_interface_name($vlan['vlanif']);
			if (!empty($assignedport) && !empty($config['interfaces'][$assignedport]['mtu'])) {
				/* VLAN MTU */
				$mtu = $config['interfaces'][$assignedport]['mtu'];
			} elseif (!empty($config['interfaces'][$vlan['if']]['mtu'])) {
				/* Parent MTU */
				$mtu = $config['interfaces'][$vlan['if']]['mtu'];
			}
		}
	}

	return $mtu;
}

function interface_mtu_wanted_for_pppoe($realif) {
	global $config;

	if (!is_array($config['ppps']) || !is_array($config['ppps']['ppp']))
		return 0;

	$mtu = 0;
	foreach ($config['ppps']['ppp'] as $ppp) {
		if ($ppp['type'] != "pppoe") {
			continue;
		}

		$mtus = array();
		if (!empty($ppp['mtu'])) {
			$mtus = explode(',', $ppp['mtu']);
		}
		$ports = explode(',', $ppp['ports']);

		foreach ($ports as $pid => $port) {
			$parentifa = get_parent_interface($port);
			$parentif = $parentifa[0];
			if ($parentif != $realif)
				continue;

			// there is an MTU configured on the port in question
			if (!empty($mtus[$pid])) {
				$mtu = intval($mtus[$pid]) + 8;
			// or use the MTU configured on the interface ...
			} elseif (is_array($config['interfaces'])) {
				foreach ($config['interfaces'] as $interface) {
					if ($interface['if'] == $ppp['if'] &&
					    !empty($interface['mtu'])) {
						$mtu = intval($interface['mtu']) + 8;
						break;
					}
				}
			}
		}
	}

	return $mtu;
}

function interface_configure($interface = "wan", $reloadall = false, $linkupevent = false) {
	global $config, $g;
	global $interface_sn_arr_cache, $interface_ip_arr_cache;
	global $interface_snv6_arr_cache, $interface_ipv6_arr_cache;

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

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

	$realif = get_real_interface($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 (!platform_booting() && !(substr($realif, 0, 4) == "ovpn")) {
		/* remove all IPv4 and IPv6 addresses */
		$tmpifaces = pfSense_getall_interface_addresses($realif);
		if (is_array($tmpifaces)) {
			foreach ($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 = $tmpiface;
					}
					pfSense_interface_deladdress($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 = $realif;
	if (interface_isppp_type($interface)) {
		$interface_to_check = $realhwif;
	}

	/* Need to check that the interface exists or not in the case where its coming back from disabled state see #3270 */
	if (!platform_booting() && (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 */
	if ($g['debug']) {
		log_error(sprintf(gettext("Deny router advertisements for interface %s"), $interface));
	}
	mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 -accept_rtadv", true);

	/* wireless configuration? */
	if (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 ($wancfg['spoofmac'] && ($wancfg['spoofmac'] != $mac)) {
		mwexec("/sbin/ifconfig " . escapeshellarg($realhwif) .
			" link " . escapeshellarg($wancfg['spoofmac']));
	} else {

		if ($mac == "ff:ff:ff:ff:ff:ff") {
			/*   this is not a valid mac address.  generate a
			 *   temporary mac address so the machine can get online.
			 */
			echo gettext("Generating new MAC address.");
			$random_mac = generate_random_mac_address();
			mwexec("/sbin/ifconfig " . escapeshellarg($realhwif) .
				" link " . escapeshellarg($random_mac));
			$wancfg['spoofmac'] = $random_mac;
			write_config();
			file_notice("MAC Address altered", sprintf(gettext('The INVALID MAC address (ff:ff:ff:ff:ff:ff) on interface %1$s has been automatically replaced with %2$s'), $realif, $random_mac), "Interfaces");
		}
	}

	/* media */
	if ($wancfg['media'] || $wancfg['mediaopt']) {
		$cmd = "/sbin/ifconfig " . escapeshellarg($realhwif);
		if ($wancfg['media']) {
			$cmd .= " media " . escapeshellarg($wancfg['media']);
		}
		if ($wancfg['mediaopt']) {
			$cmd .= " mediaopt " . escapeshellarg($wancfg['mediaopt']);
		}
		mwexec($cmd);
	}

	/* Apply hw offloading policies as configured */
	enable_hardware_offloading($interface);

	/* invalidate interface/ip/sn cache */
	get_interface_arr(true);
	unset($interface_ip_arr_cache[$realif]);
	unset($interface_sn_arr_cache[$realif]);
	unset($interface_ipv6_arr_cache[$realif]);
	unset($interface_snv6_arr_cache[$realif]);

	$tunnelif = substr($realif, 0, 3);

	$mtuif = $realif;
	$mtuhwif = $realhwif;

	/* adjust MTU of parent interface of PPPoE interface if this does not violate explicit configuration */
	if (interface_isppp_type($interface)) {
		$mtuif = $realhwif;
		$mtuhwif_array = get_parent_interface($mtuif);
		$mtuhwif = $mtuhwif_array[0];
	}

	$wantedmtu = 0;
	if (is_array($config['interfaces'])) {
		foreach ($config['interfaces'] as $tmpinterface) {
			if ($tmpinterface['if'] == $mtuif && !empty($tmpinterface['mtu'])) {
				$wantedmtu = $tmpinterface['mtu'];
				break;
			}
		}
	}

	/* MTU is not specified for interface, try the pppoe settings. */
	if ($wantedmtu == 0) {
		$wantedmtu = interface_mtu_wanted_for_pppoe($mtuif);
	}
	if ($wantedmtu == 0 && stristr($mtuif, "_vlan") && interface_isppp_type($interface)) {
		$wantedmtu = interface_mtu_wanted_for_pppoe($mtuhwif);
	}

	/* Set the MTU to 1500 if no explicit MTU configured. */
	if ($wantedmtu == 0) {
		$wantedmtu = 1500; /* Default */
	}

	if (stristr($mtuif, "_vlan")) {
		$assignedparent = convert_real_interface_to_friendly_interface_name($mtuhwif);
		if (!empty($assignedparent) && !empty($config['interfaces'][$assignedparent]['mtu'])) {
			$parentmtu = $config['interfaces'][$assignedparent]['mtu'];
			if ($wancfg['mtu'] > $parentmtu) {
				log_error(sprintf(gettext('There is a conflict on MTU between parent %1$s and VLAN(%2$s)'), $mtuhwif, $mtuif));
			}
		}

		$configuredmtu = interface_vlan_mtu_configured($mtuif);

		if ($configuredmtu != 0 && $configuredmtu > $parentmtu)
			$configuredmtu = $parentmtu;
		if ($configuredmtu != 0)
			$mtu = $configuredmtu;
		else
			$mtu = $wantedmtu;

		/* Set the parent MTU. */
		if (get_interface_mtu($mtuhwif) < $mtu)
			set_interface_mtu($mtuhwif, $mtu);
		/* Set the VLAN MTU. */
		if (get_interface_mtu($mtuif) != $mtu)
			set_interface_mtu($mtuif, $mtu);
	} else if (substr($mtuif, 0, 4) == 'lagg') {
		/* LAGG interface must be destroyed and re-created to change MTU */
		if ($wantedmtu != get_interface_mtu($mtuif)) {
			if (isset($config['laggs']['lagg']) && is_array($config['laggs']['lagg'])) {
				foreach ($config['laggs']['lagg'] as $lagg) {
					if ($lagg['laggif'] == $mtuif) {
						interface_lagg_configure($lagg);
						break;
					}
				}
			}
		}
	} else {
		if ($wantedmtu != get_interface_mtu($mtuif)) {
			pfSense_interface_mtu($mtuif, $wantedmtu);
		}
	}
	/* XXX: What about gre/gif/.. ? */

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

	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']) && $wancfg['subnet'] <> "") {
					pfSense_interface_setaddress($realif, "{$wancfg['ipaddr']}/{$wancfg['subnet']}");
				}
			}
			break;
	}

	switch ($wancfg['ipaddrv6']) {
		case 'slaac':
		case 'dhcp6':
			// N.B. PPP connections using PPP as the IPv6 parent interface are excluded because the ppp-ipv6 script
			// calls interface_dhcpv6_configure() for these connections after IPv6CP is up, whilst rc.newwanip
			// handles all non-PPP connections with 'dhcp6usev4iface' set
			if (!(isset($wancfg['dhcp6usev4iface']) || $wancfg['ipaddr']==='ppp')) {
				interface_dhcpv6_configure($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']) && $wancfg['subnetv6'] <> "") {
					//pfSense_interface_setaddress($realif, "{$wancfg['ipaddrv6']}/{$wancfg['subnetv6']}");
					// FIXME: Add IPv6 Support to the pfSense module
					mwexec("/sbin/ifconfig " . escapeshellarg($realif) . " inet6 {$wancfg['ipaddrv6']} prefixlen " . escapeshellarg($wancfg['subnetv6']));
				}
			}
			break;
	}

	interface_netgraph_needed($interface);

	if (!platform_booting()) {
		link_interface_to_vips($interface, "update");

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

		if ($tunnelif != 'gif') {
			unset($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) {

			/* reconfigure static routes (kernel may have deleted them) */
			system_routing_configure($interface);

			/* reload ipsec tunnels */
			send_event("service reload ipsecdns");

			if (isset($config['dnsmasq']['enable'])) {
				services_dnsmasq_configure();
			}

			if (isset($config['unbound']['enable'])) {
				services_unbound_configure();
			}

			/* update dyndns */
			send_event("service reload dyndns {$interface}");

			/* reload captive portal */
			if (!function_exists('captiveportal_init_rules_byinterface')) {
				require_once('captiveportal.inc');
			}
			captiveportal_init_rules_byinterface($interface);
		}
	}

	interfaces_staticarp_configure($interface);
	return 0;
}

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

	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, true);
	if (!empty($linklocal) && $linklocal != "fe80::1:1%{$realif}") {
		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($trackcfg['enable'])) {
		log_error(sprintf(gettext('Interface %1$s tracking non-existent interface %2$s'), $interface, $wancfg['track6-interface']));
		return;
	}

	switch ($trackcfg['ipaddrv6']) {
		case "6to4":
			if ($g['debug']) {
				log_error(sprintf(gettext('Interface %1$s configured via %2$s type %3$s'), $interface, $wancfg['track6-interface'], $type));
			}
			interface_track6_6to4_configure($interface, $wancfg);
			break;
		case "6rd":
			if ($g['debug']) {
				log_error(sprintf(gettext('Interface %1$s configured via %2$s type %3$s'), $interface, $wancfg['track6-interface'], $type));
			}
			interface_track6_6rd_configure($interface, $wancfg);
			break;
		case "dhcp6":
			if ($linkupevent == true) {
				/*
				 * NOTE: Usually come here from rc.linkup calling so just call directly instead of generating event
				 * 	Instead of disrupting all other v4 configuration just restart DHCPv6 client for now
				 *
				 * XXX: Probably DHCPv6 client should handle this automagically itself?
				 */
				$parentrealif = get_real_interface($wancfg['track6-interface']);
				$pidv6 = find_dhcp6c_process($parentrealif);
				if ($pidv6) {
					posix_kill($pidv6, SIGHUP);
				}
			}
			break;
	}

	if ($linkupevent == false && !platform_booting()) {
		if (!function_exists('services_dhcpd_configure')) {
			require_once("services.inc");
		}

		if (isset($config['unbound']['enable'])) {
			services_unbound_configure();
		}

		if (isset($config['dnsmasq']['enable'])) {
			services_dnsmasq_configure();
		}

		services_dhcpd_configure("inet6");
	}

	return 0;
}

function interface_track6_6rd_configure($interface = "lan", $lancfg) {
	global $config, $g;
	global $interface_ipv6_arr_cache;
	global $interface_snv6_arr_cache;

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

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

	$wancfg = $config['interfaces'][$lancfg['track6-interface']];
	if (empty($wancfg)) {
		log_error(sprintf(gettext('Interface %1$s tracking non-existent interface %2$s'), $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(sprintf(gettext('The interface IPv4 \'%1$s\' address on interface \'%2$s\' is not valid, not configuring 6RD tunnel'), $ip4address, $lancfg['track6-interface']));
		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 {$oip} delete");
	}
	unset($interface_ipv6_arr_cache[$lanif]);
	unset($interface_snv6_arr_cache[$lanif]);
	log_error(sprintf(gettext('rd6 %1$s with ipv6 address %2$s based on %3$s ipv4 %4$s'), $interface, $rd6lan, $lancfg['track6-interface'], $ip4address));
	mwexec("/sbin/ifconfig {$lanif} inet6 {$rd6lan} prefixlen 64");

	return 0;
}

function interface_track6_6to4_configure($interface = "lan", $lancfg) {
	global $config, $g;
	global $interface_ipv6_arr_cache;
	global $interface_snv6_arr_cache;

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

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

	$wancfg = $config['interfaces'][$lancfg['track6-interface']];
	if (empty($wancfg)) {
		log_error(sprintf(gettext('Interface %1$s tracking non-existent interface %2$s'), $interface, $lancfg['track6-interface']));
		return;
	}

	$ip4address = get_interface_ip($lancfg['track6-interface']);
	if (!is_ipaddrv4($ip4address) || is_private_ip($ip4address)) {
		log_error(sprintf(gettext('The interface IPv4 \'%1$s\' address on interface \'%2$s\' is not public, not configuring 6RD tunnel'), $ip4address, $lancfg['track6-interface']));
		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 {$oip} delete");
	}
	unset($interface_ipv6_arr_cache[$lanif]);
	unset($interface_snv6_arr_cache[$lanif]);
	log_error(sprintf(gettext('sixto4 %1$s with ipv6 address %2$s based on %3$s ipv4 %4$s'), $interface, $sixto4lan, $lancfg['track6-interface'], $ip4address));
	mwexec("/sbin/ifconfig {$lanif} inet6 {$sixto4lan} prefixlen 64");

	return 0;
}

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

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

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

	if (!is_module_loaded('if_stf.ko')) {
		mwexec('/sbin/kldload if_stf.ko');
	}

	$wanif = get_real_interface($interface);
	$ip4address = find_interface_ip($wanif);
	if (!is_ipaddrv4($ip4address)) {
		log_error(sprintf(gettext('The interface IPv4 \'%1$s\' address on interface \'%2$s\' is not public, not configuring 6RD tunnel'), $ip4address, $wanif));
		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];
	$brgw = explode('.', $wancfg['gateway-6rd']);
	$rd6brgw = substr(Net_IPv6::_ip2Bin($rd6prefix[0]), 0, $rd6prefixlen);
	$rd6brgw .= str_pad(decbin($brgw[0]), 8, '0', STR_PAD_LEFT) . str_pad(decbin($brgw[1]), 8, '0', STR_PAD_LEFT) . str_pad(decbin($brgw[2]), 8, '0', STR_PAD_LEFT) . str_pad(decbin($brgw[3]), 8, '0', STR_PAD_LEFT);
	if (strlen($rd6brgw) < 128) {
		$rd6brgw = str_pad($rd6brgw, 128, '0', STR_PAD_RIGHT);
	}
	$rd6brgw = Net_IPv6::compress(Net_IPv6::_bin2Ip($rd6brgw));
	unset($brgw);
	$rd6prefix = Net_IPv6::uncompress($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);


	/* XXX: need to extend to support variable prefix size for v4 */
	if (!is_module_loaded("if_stf")) {
		mwexec("/sbin/kldload if_stf.ko");
	}
	$stfiface = "{$interface}_stf";
	if (does_interface_exist($stfiface)) {
		pfSense_interface_destroy($stfiface);
	}
	$tmpstfiface = pfSense_interface_create("stf");
	pfSense_interface_rename($tmpstfiface, $stfiface);
	pfSense_interface_flags($stfiface, IFF_LINK2);
	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 {$ip4address}/" . escapeshellarg($wancfg['prefix-6rd-v4plen']));
	}
	if ($g['debug']) {
		log_error("Created 6rd interface {$stfiface} {$rd6prefix}/{$rd6prefixlen}");
	}

	/* write out a default router file */
	file_put_contents("{$g['tmp_path']}/{$wanif}_routerv6", "{$rd6brgw}\n");
	file_put_contents("{$g['tmp_path']}/{$wanif}_defaultgwv6", "{$rd6brgw}\n");

	$ip4gateway = get_interface_gateway($interface);
	if (is_ipaddrv4($ip4gateway)) {
		mwexec("/sbin/route change -host " . escapeshellarg($wancfg['gateway-6rd']) . " {$ip4gateway}");
	}

	/* configure dependent interfaces */
	if (!platform_booting()) {
		link_interface_to_track6($interface, "update");
	}

	return 0;
}

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

	/* 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(sprintf(gettext('The interface IPv4 \'%1$s\' address on interface \'%2$s\' is not public, not configuring 6RD tunnel'), $ip4address, $wanif));
		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));

	/* setup the stf interface */
	if (!is_module_loaded("if_stf")) {
		mwexec("/sbin/kldload if_stf.ko");
	}
	$stfiface = "{$interface}_stf";
	if (does_interface_exist($stfiface)) {
		pfSense_interface_destroy($stfiface);
	}
	$tmpstfiface = pfSense_interface_create("stf");
	pfSense_interface_rename($tmpstfiface, $stfiface);
	pfSense_interface_flags($stfiface, IFF_LINK2);
	mwexec("/sbin/ifconfig {$stfiface} inet6 {$stflanpr} prefixlen 16");

	if ($g['debug']) {
		log_error("Set IPv6 address inet6 {$stflanpr} prefixlen 16 for {$stfiface}, route {$stfbrgw}");
	}

	/* write out a default router file */
	file_put_contents("{$g['tmp_path']}/{$wanif}_routerv6", "{$stfbrgw}");
	file_put_contents("{$g['tmp_path']}/{$wanif}_defaultgwv6", "{$stfbrgw}");

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

	if (!platform_booting()) {
		link_interface_to_track6($interface, "update");
	}

	return 0;
}

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

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

	$wanif = get_real_interface($interface, "inet6");
	$dhcp6cconf = "";

	if ($wancfg['adv_dhcp6_config_file_override']) {
		// DHCP6 Config File Override
		$dhcp6cconf = DHCP6_Config_File_Override($wancfg, $wanif);
	} elseif ($wancfg['adv_dhcp6_config_advanced']) {
		// DHCP6 Config File Advanced
		$dhcp6cconf = DHCP6_Config_File_Advanced($interface, $wancfg, $wanif);
	} else {
		// DHCP6 Config File Basic
		$dhcp6cconf .= "interface {$wanif} {\n";

		/* for SLAAC interfaces we do fire off a dhcp6 client for just our name servers */
		if ($wancfg['ipaddrv6'] == "slaac") {
			$dhcp6cconf .= "\tinformation-only;\n";
			$dhcp6cconf .= "\trequest domain-name-servers;\n";
			$dhcp6cconf .= "\trequest domain-name;\n";
			$dhcp6cconf .= "\tscript \"{$g['varetc_path']}/dhcp6c_{$interface}_script.sh\"; # we'd like some nameservers please\n";
			$dhcp6cconf .= "};\n";
		} else {
			$trackiflist = array();
			$iflist = link_interface_to_track6($interface);
			foreach ($iflist as $ifname => $ifcfg) {
				if (is_numeric($ifcfg['track6-prefix-id'])) {
					$trackiflist[$ifname] = $ifcfg;
				}
			}

			/* skip address request if this is set */
			if (!isset($wancfg['dhcp6prefixonly'])) {
				$dhcp6cconf .= "\tsend ia-na 0;\t# request stateful address\n";
			}
			if (is_numeric($wancfg['dhcp6-ia-pd-len']) && !empty($trackiflist)) {
				$dhcp6cconf .= "\tsend ia-pd 0;\t# request prefix delegation\n";
			}

			$dhcp6cconf .= "\trequest domain-name-servers;\n";
			$dhcp6cconf .= "\trequest domain-name;\n";
			$dhcp6cconf .= "\tscript \"{$g['varetc_path']}/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($wancfg['dhcp6-ia-pd-len']) && !empty($trackiflist)) {
				/* 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'])) {
					$dhcp6cconf .= "\tprefix ::/{$preflen} infinity;\n";
				}
				foreach ($trackiflist as $friendly => $ifcfg) {
					if ($g['debug']) {
						log_error("setting up $ifdescr - {$ifcfg['track6-prefix-id']}");
					}
					$realif = get_real_interface($friendly);
					$dhcp6cconf .= "\tprefix-interface {$realif} {\n";
					$dhcp6cconf .= "\t\tsla-id {$ifcfg['track6-prefix-id']};\n";
					$dhcp6cconf .= "\t\tsla-len {$wancfg['dhcp6-ia-pd-len']};\n";
					$dhcp6cconf .= "\t};\n";
				}
				unset($preflen, $iflist, $ifcfg, $ifname);
				$dhcp6cconf .= "};\n";
			}
			unset($trackiflist);
		}
	}

	/* wide-dhcp6c works for now. */
	if (!@file_put_contents("{$g['varetc_path']}/dhcp6c_{$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 /etc/rc.newwanipv6 with a interface argument.\n";
	$dhcp6cscript .= "dmips=\${new_domain_name_servers}\n";
	$dhcp6cscript .= "dmnames=\${new_domain_name}\n";
	$dhcp6cscript .= "/usr/local/sbin/fcgicli -f /etc/rc.newwanipv6 -d \"interface={$wanif}&dmnames=\${dmnames}&dmips=\${dmips}\"\n";
	/* Add wide-dhcp6c shell script here. Because we can not pass a argument to it. */
	if (!@file_put_contents("{$g['varetc_path']}/dhcp6c_{$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("{$g['varetc_path']}/dhcp6c_{$interface}_script.sh", 0755);

	$rtsoldscript = "#!/bin/sh\n";
	$rtsoldscript .= "# This shell script launches dhcp6c and configured gateways for this interface.\n";
	$rtsoldscript .= "echo $2 > {$g['tmp_path']}/{$wanif}_routerv6\n";
	$rtsoldscript .= "echo $2 > {$g['tmp_path']}/{$wanif}_defaultgwv6\n";
	$rtsoldscript .= "/usr/bin/logger -t rtsold \"Recieved RA specifying route \$2 for interface {$interface}({$wanif})\"\n";
	$rtsoldscript .= "if [ -f {$g['varrun_path']}/dhcp6c_{$wanif}.pid ]; then\n";
	$rtsoldscript .= "\t/bin/pkill -F {$g['varrun_path']}/dhcp6c_{$wanif}.pid\n";
	$rtsoldscript .= "\t/bin/sleep 1\n";
	$rtsoldscript .= "fi\n";
	$debugOption = isset($wancfg['dhcp6debug']) ? "-D" : "-d";
	$rtsoldscript .= "/usr/local/sbin/dhcp6c {$debugOption} -c {$g['varetc_path']}/dhcp6c_{$interface}.conf -p {$g['varrun_path']}/dhcp6c_{$wanif}.pid {$wanif}\n";
	$rtsoldscript .= "/usr/bin/logger -t rtsold \"Starting dhcp6 client for interface {$interface}({$wanif})\"\n";
	/* Add wide-dhcp6c shell script here. Because we can not pass a argument to it. */
	if (!@file_put_contents("{$g['varetc_path']}/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("{$g['varetc_path']}/rtsold_{$wanif}_script.sh", 0755);

	/* accept router advertisements for this interface */
	log_error("Accept router advertisements on interface {$wanif} ");
	mwexec("/sbin/ifconfig {$wanif} inet6 accept_rtadv");

	/* fire up rtsold for IPv6 RAs first, this backgrounds immediately. It will call dhcp6c */
	if (isvalidpid("{$g['varrun_path']}/rtsold_{$wanif}.pid")) {
		killbypid("{$g['varrun_path']}/rtsold_{$wanif}.pid");
		sleep(2);
	}
	mwexec("/usr/sbin/rtsold -1 -p {$g['varrun_path']}/rtsold_{$wanif}.pid -O {$g['varetc_path']}/rtsold_{$wanif}_script.sh {$wanif}");

	/* NOTE: will be called from rtsold invoked script
	 * link_interface_to_track6($interface, "update");
	 */

	return 0;
}

function DHCP6_Config_File_Advanced($interface, $wancfg, $wanif) {
	global $g;

	$send_options = "";
	if ($wancfg['adv_dhcp6_interface_statement_send_options'] != '') {
		$options = DHCP_Config_Option_Split($wancfg['adv_dhcp6_interface_statement_send_options']);
		foreach ($options as $option) {
			$send_options .= "\tsend " . trim($option) . ";\n";
		}
	}

	$request_options = "";
	if ($wancfg['adv_dhcp6_interface_statement_request_options'] != '') {
		$options = DHCP_Config_Option_Split($wancfg['adv_dhcp6_interface_statement_request_options']);
		foreach ($options as $option) {
			$request_options .= "\trequest " . trim($option) . ";\n";
		}
	}

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

	$script = "\tscript \"{$g['varetc_path']}/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_Override($wancfg, $wanif) {

	$dhcp6cconf = @file_get_contents($wancfg['adv_dhcp6_config_file_override_path']);

	if ($dhcp6cconf === false) {
		log_error(sprintf(gettext('Error: cannot open %s in DHCP6_Config_File_Override() for reading.'), $wancfg['adv_dhcp6_config_file_override_path']));
		return '';
	} else {
		return DHCP6_Config_File_Substitutions($wancfg, $wanif, $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, $g;

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

	/* generate dhclient_wan.conf */
	$fd = fopen("{$g['varetc_path']}/dhclient_{$interface}.conf", "w");
	if (!$fd) {
		log_error(sprintf(gettext("Error: cannot open dhclient_%s.conf in interface_dhcp_configure() for writing."), $interface));
		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(gettext("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 "/sbin/dhclient-script";
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 ($wancfg['adv_dhcp_config_file_override']) {
		$dhclientconf = DHCP_Config_File_Override($wancfg, $wanif);
	}

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

	/* bring wan interface up before starting dhclient */
	if ($wanif) {
		interfaces_bring_up($wanif);
	} else {
		log_error(sprintf(gettext("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 {$g['varetc_path']}/dhclient_{$interface}.conf {$wanif} > {$g['tmp_path']}/{$wanif}_output 2> {$g['tmp_path']}/{$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'] != '') {
		$options = DHCP_Config_Option_Split($wancfg['adv_dhcp_send_options']);
		foreach ($options as $option) {
			$send_options .= "\tsend " . trim($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'] != '') {
		$modifiers = DHCP_Config_Option_Split($wancfg['adv_dhcp_option_modifiers']);
		foreach ($modifiers as $modifier) {
			$option_modifiers .= "\t" . trim($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}";
	$dhclientconf .= "\n";
	if (is_ipaddrv4($wancfg['dhcprejectfrom'])) {
		$dhclientconf .= "reject {$wancfg['dhcprejectfrom']};\n";
	}
	$dhclientconf .= "\tscript \"/sbin/dhclient-script\";\n";
	$dhclientconf .= "}\n";

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

	return $dhclientconf;
}

function DHCP_Config_Option_Split($option_string) {
	preg_match_all('/[^",]*(?:"[^"]*"[^",]*)+(?:"[^",]*)?|[^,]+/m', $option_string, $matches, PREG_PATTERN_ORDER);
	return $matches ? $matches[0] : [];
}

function DHCP_Config_File_Override($wancfg, $wanif) {

	$dhclientconf = @file_get_contents($wancfg['adv_dhcp_config_file_override_path']);

	if ($dhclientconf === false) {
		log_error(sprintf(gettext("Error: cannot open %s in DHCP_Config_File_Override() for reading.\n"), $wancfg['adv_dhcp_config_file_override_path']));
		return '';
	} else {
		return DHCP_Config_File_Substitutions($wancfg, $wanif, $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 (:) delimiters */
					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 (!is_array($config['ifgroups']['ifgroupentry'])) {
		return;
	}

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

	return;
}

function interface_group_setup(&$groupname /* The parameter is an array */) {
	global $config;

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

	return;
}

function is_interface_group($if) {
	global $config;

	if (is_array($config['ifgroups']['ifgroupentry'])) {
		foreach ($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);
	if (does_interface_exist($interface)) {
		mwexec("/sbin/ifconfig {$interface} group " . escapeshellarg($groupname), true);
	}
}

/* COMPAT Function */
function convert_friendly_interface_to_real_interface_name($interface) {
	return get_real_interface($interface);
}

/* COMPAT Function */
function get_real_wan_interface($interface = "wan") {
	return get_real_interface($interface);
}

/* COMPAT Function */
function get_current_wan_address($interface = "wan") {
	return get_interface_ip($interface);
}

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

	/* XXX: For speed reasons reference directly the interface array */
	$ifdescrs = &$config['interfaces'];
	//$ifdescrs = get_configured_interface_list(false, true);

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

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

		if ($checkparent == false) {
			continue;
		}

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

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

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

	switch ($interface) {
		case "l2tp":
			$ifdesc = "L2TP";
			break;
		case "pptp":
			$ifdesc = "PPTP";
			break;
		case "pppoe":
			$ifdesc = "PPPoE";
			break;
		case "openvpn":
			$ifdesc = "OpenVPN";
			break;
		case "lo0":
			$ifdesc = "Loopback";
			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'][$interface]['descr']);
				}
				break;
			} else if (substr($interface, 0, 4) == '_vip') {
				if (is_array($config['virtualip']['vip'])) {
					foreach ($config['virtualip']['vip'] as $counter => $vip) {
						if ($vip['mode'] == "carp") {
							if ($interface == "_vip{$vip['uniqid']}") {
								return "{$vip['subnet']} - {$vip['descr']}";
							}
						}
					}
				}
			} else if (substr($interface, 0, 5) == '_lloc') {
				return get_interface_linklocal($interface);
			} 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 (is_array($config['ppps']['ppp'])) {
						foreach ($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($parent_if);
								}
								break;
							}
						}
					}
				}
				break;
			case "dhcp":
			case "static":
			default:
				// Handle _vlans
				if (strpos($realif, '_vlan') !== FALSE) {
					if (is_array($config['vlans']['vlan'])) {
						foreach ($config['vlans']['vlan'] as $vlanidx => $vlan) {
							if ($ifcfg['if'] == $vlan['vlanif']) {
								$parents[0] = $vlan['if'];
								break;
							}
						}
					}
				}
				break;
		}
	}

	if (empty($parents)) {
		// Handle _vlans not assigned to an interface
		if (strpos($realif, '_vlan') !== FALSE) {
			if (is_array($config['vlans']['vlan'])) {
				foreach ($config['vlans']['vlan'] as $vlanidx => $vlan) {
					if ($realif == $vlan['vlanif']) {
						$parents[0] = $vlan['if'];
						break;
					}
				}
			}
		}
	}

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

	return $parents;
}

/*
 *  get_parent_physical_interface($interface):
 *   - returns an array of parent interface(s) for a given interface friendly name (e.g. wan)
 *  differs from get_parent_interface in that it traverses to find the physical NICs on lagg
 */
function get_parent_physical_interface($interface) {
	global $config;

	$realif = get_parent_interface($interface);

	if (substr($realif[0], 0, 4) == "lagg") {
		foreach ($config['laggs']['lagg'] as $lagg) {
			if ($realif[0] == $lagg['laggif']) {
				return explode(",", $lagg['members']);
			}
		}
	} else {
		return $realif;
	}
}

function interface_is_wireless_clone($wlif) {
	if (!stristr($wlif, "_wlan")) {
		return false;
	} else {
		return true;
	}
}

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, $g;

	$wanif = NULL;

	switch ($interface) {
		case "l2tp":
			$wanif = "l2tp";
			break;
		case "pptp":
			$wanif = "pptp";
			break;
		case "pppoe":
			$wanif = "pppoe";
			break;
		case "openvpn":
			$wanif = "openvpn";
			break;
		case "IPsec":
		case "ipsec":
		case "enc0":
			$wanif = "enc0";
			break;
		case "ppp":
			$wanif = "ppp";
			break;
		default:
			if (substr($interface, 0, 4) == '_vip') {
				$wanif = get_configured_vip_interface($interface);
				if (!empty($wanif)) {
					$wanif = get_real_interface($wanif);
				}
				break;
			} else if (substr($interface, 0, 5) == '_lloc') {
				$interface = substr($interface, 5);
			} else if (strstr($interface, "_vlan") ||
			    does_interface_exist($interface, $flush)) {
				/*
				 * If a real interface was already 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.
				 */
				$wanif = $interface;
				break;
			}

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

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

			if ($family == "inet6") {
				switch ($cfg['ipaddrv6']) {
					case "6rd":
					case "6to4":
						$wanif = "{$interface}_stf";
						break;
					case 'pppoe':
					case 'ppp':
					case 'l2tp':
					case 'pptp':
						if (is_array($cfg['wireless']) || preg_match($g['wireless_regex'], $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 = $cfg['if'];
									}
								}
								break;
							default:
								if (is_array($cfg['wireless']) || preg_match($g['wireless_regex'], $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: $parentnic_wlanparentnic#
				// example: ath0_wlan0
				if (is_array($cfg['wireless']) || preg_match($g['wireless_regex'], $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) {

	$family = '';
	if (is_ipaddrv4($ipaddress)) {
		$family = 'inet';
	}
	if (empty($family) && is_ipaddrv6($ipaddress)) {
		$family = 'inet6';
	}

	if (empty($family)) {
		return false;
	}

	/* create a route table we can search */
	$output = '';
	$_gb = exec("/sbin/route -n get -{$family} " . escapeshellarg($ipaddress) . " | /usr/bin/awk '/interface/ { print \$2; };'", $output);
	$output[0] = trim($output[0], " \n");
	if (!empty($output[0])) {
		return $output[0];
	}

	return false;
}

/*
 * find_ip_interface($ip): return the interface where an ip is defined
 *   (or if $bits is specified, where an IP within the subnet is defined)
 */
function find_ip_interface($ip, $bits = null) {
	if (!is_ipaddr($ip)) {
		return false;
	}

	$isv6ip = is_ipaddrv6($ip);

	/* if list */
	$ifdescrs = get_configured_interface_list();

	foreach ($ifdescrs as $ifdescr => $ifname) {
		$ifip = ($isv6ip) ? get_interface_ipv6($ifname) : get_interface_ip($ifname);
		if (is_null($ifip)) {
			continue;
		}
		if (is_null($bits)) {
			if ($ip == $ifip) {
				$int = get_real_interface($ifname);
				return $int;
			}
		} else {
			if (ip_in_subnet($ifip, $ip . "/" . $bits)) {
				$int = get_real_interface($ifname);
				return $int;
			}
		}
	}

	return false;
}

/*
 * find_virtual_ip_alias($ip): return the virtual IP alias where an IP is found
 *   (or if $bits is specified, where an IP within the subnet is found)
 */
function find_virtual_ip_alias($ip, $bits = null) {
	global $config;

	if (!is_array($config['virtualip']['vip'])) {
		return false;
	}
	if (!is_ipaddr($ip)) {
		return false;
	}

	$isv6ip = is_ipaddrv6($ip);

	foreach ($config['virtualip']['vip'] as $vip) {
		if ($vip['mode'] === "ipalias") {
			if (is_ipaddrv6($vip['subnet']) != $isv6ip) {
				continue;
			}
			if (is_null($bits)) {
				if (ip_in_subnet($ip, $vip['subnet'] . "/" . $vip['subnet_bits'])) {
					return $vip;
				}
			} else {
				if (($isv6ip && check_subnetsv6_overlap($ip, $bits, $vip['subnet'], $vip['subnet_bits'])) ||
				    (!$isv6ip && check_subnets_overlap($ip, $bits, $vip['subnet'], $vip['subnet_bits']))) {
					return $vip;
				}
			}
		}
	}
	return false;
}

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

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

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

function interface_find_child_cfgmtu($realiface) {
	global $config;

	$interface = convert_real_interface_to_friendly_interface_name($realiface);
	$vlans = link_interface_to_vlans($realiface);
	$bridge = link_interface_to_bridge($realiface);
	if (!empty($interface)) {
		$gifs = link_interface_to_gif($interface);
		$gres = link_interface_to_gre($interface);
	} else {
		$gifs = array();
		$gres = array();
	}

	$mtu = 0;
	if (is_array($vlans)) {
		foreach ($vlans as $vlan) {
			$ifass = convert_real_interface_to_friendly_interface_name($vlan['vlanif']);
			if (empty($ifass)) {
				continue;
			}
			if (!empty($config['interfaces'][$ifass]['mtu'])) {
				if (intval($config['interfaces'][$ifass]['mtu']) > $mtu) {
					$mtu = intval($config['interfaces'][$ifass]['mtu']);
				}
			}
		}
	}
	if (is_array($gifs)) {
		foreach ($gifs as $gif) {
			$ifass = convert_real_interface_to_friendly_interface_name($gif['gifif']);
			if (empty($ifass)) {
				continue;
			}
			if (!empty($config['interfaces'][$ifass]['mtu'])) {
				if (intval($config['interfaces'][$ifass]['mtu']) > $mtu) {
					$mtu = intval($config['interfaces'][$ifass]['mtu']);
				}
			}
		}
	}
	if (is_array($gres)) {
		foreach ($gres as $gre) {
			$ifass = convert_real_interface_to_friendly_interface_name($gre['greif']);
			if (empty($ifass)) {
				continue;
			}
			if (!empty($config['interfaces'][$ifass]['mtu'])) {
				if (intval($config['interfaces'][$ifass]['mtu']) > $mtu) {
					$mtu = intval($config['interfaces'][$ifass]['mtu']);
				}
			}
		}
	}
	$ifass = convert_real_interface_to_friendly_interface_name($bridge);
	if (!empty($ifass) && !empty($config['interfaces'][$ifass]['mtu'])) {
		if (intval($config['interfaces'][$ifass]['mtu']) > $mtu) {
			$mtu = intval($config['interfaces'][$ifass]['mtu']);
		}
	}
	unset($vlans, $bridge, $gifs, $gres, $ifass, $vlan);

	return $mtu;
}

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

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

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

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

	$updatevips = false;
	if (is_array($config['virtualip']['vip'])) {
		$result = array();
		foreach ($config['virtualip']['vip'] as $vip) {
			if (substr($vip['interface'], 0, 4) == "_vip") {
				$iface = get_configured_vip_interface($vip['interface']);
			} else {
				$iface = $vip['interface'];
			}
			if ($int != $iface) {
				continue;
			}
			if ($action == "update") {
				$updatevips = true;
			} else {
				if (empty($vhid) || ($vhid == $vip['vhid']) ||
				    substr($vip['interface'], 0, 4) == "_vip") {
					$result[] = $vip;
				}
			}
		}
		if ($updatevips === true) {
			interfaces_vips_configure($int);
		}
		return $result;
	}

	return NULL;
}

/****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 (is_array($config['bridges']['bridged'])) {
		foreach ($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 (is_array($config['ifgroups']['ifgroupentry'])) {
		foreach ($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 (is_array($config['gres']['gre'])) {
		foreach ($config['gres']['gre'] as $gre) {
			if ($gre['if'] == $interface) {
				$result[] = $gre;
			}
		}
	}

	return $result;
}

function link_interface_to_gif($interface) {
	global $config;

	$result = array();

	if (is_array($config['gifs']['gif'])) {
		foreach ($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, $flush = false) {
	global $interface_ip_arr_cache;
	global $interface_sn_arr_cache;

	$interface = str_replace("\n", "", $interface);

	if (!does_interface_exist($interface)) {
		return;
	}

	/* Setup IP cache */
	if (!isset($interface_ip_arr_cache[$interface]) or $flush) {
		$ifinfo = pfSense_get_interface_addresses($interface);
		$interface_ip_arr_cache[$interface] = $ifinfo['ipaddr'];
		$interface_sn_arr_cache[$interface] = $ifinfo['subnetbits'];
	}

	return $interface_ip_arr_cache[$interface];
}

/*
 * find_interface_ipv6($interface): return the interface ip (first found)
 */
function find_interface_ipv6($interface, $flush = false) {
	global $interface_ipv6_arr_cache;
	global $interface_snv6_arr_cache;
	global $config;

	$interface = trim($interface);
	$interface = get_real_interface($interface);

	if (!does_interface_exist($interface)) {
		return;
	}

	/* Setup IP cache */
	if (!isset($interface_ipv6_arr_cache[$interface]) or $flush) {
		$ifinfo = pfSense_get_interface_addresses($interface);
		$interface_ipv6_arr_cache[$interface] = $ifinfo['ipaddr6'];
		$interface_snv6_arr_cache[$interface] = $ifinfo['subnetbits6'];
	}

	return $interface_ipv6_arr_cache[$interface];
}

/*
 * find_interface_ipv6_ll($interface): return the interface ipv6 link local (first found)
 */
function find_interface_ipv6_ll($interface, $flush = false) {
	global $interface_llv6_arr_cache;
	global $config;

	$interface = str_replace("\n", "", $interface);

	if (!does_interface_exist($interface)) {
		return;
	}

	/* Setup IP cache */
	if (!isset($interface_llv6_arr_cache[$interface]) or $flush) {
		$ifinfo = pfSense_getall_interface_addresses($interface);
		foreach ($ifinfo as $line) {
			if (strstr($line, ":")) {
				$parts = explode("/", $line);
				if (is_linklocal($parts[0])) {
					$ifinfo['linklocal'] = $parts[0];
				}
			}
		}
		$interface_llv6_arr_cache[$interface] = $ifinfo['linklocal'];
	}
	return $interface_llv6_arr_cache[$interface];
}

function find_interface_subnet($interface, $flush = false) {
	global $interface_sn_arr_cache;
	global $interface_ip_arr_cache;

	$interface = str_replace("\n", "", $interface);
	if (does_interface_exist($interface) == false) {
		return;
	}

	if (!isset($interface_sn_arr_cache[$interface]) or $flush) {
		$ifinfo = pfSense_get_interface_addresses($interface);
		$interface_ip_arr_cache[$interface] = $ifinfo['ipaddr'];
		$interface_sn_arr_cache[$interface] = $ifinfo['subnetbits'];
	}

	return $interface_sn_arr_cache[$interface];
}

function find_interface_subnetv6($interface, $flush = false) {
	global $interface_snv6_arr_cache;
	global $interface_ipv6_arr_cache;

	$interface = str_replace("\n", "", $interface);
	if (does_interface_exist($interface) == false) {
		return;
	}

	if (!isset($interface_snv6_arr_cache[$interface]) or $flush) {
		$ifinfo = pfSense_get_interface_addresses($interface);
		$interface_ipv6_arr_cache[$interface] = $ifinfo['ipaddr6'];
		$interface_snv6_arr_cache[$interface] = $ifinfo['subnetbits6'];
	}

	return $interface_snv6_arr_cache[$interface];
}

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

	if (empty($interface) || !is_ipaddr($ipalias)) {
		return false;
	}
	if (is_array($config['virtualip']['vip'])) {
		foreach ($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_possible_listen_ips($include_ipv6_link_local=false) {

	$interfaces = get_configured_interface_with_descr();
	foreach ($interfaces as $iface => $ifacename) {
		if ($include_ipv6_link_local) {
			/* This is to avoid going though added ll below */
			if (substr($iface, 0, 5) == '_lloc') {
				continue;
			}
			$llip = find_interface_ipv6_ll(get_real_interface($iface));
			if (!empty($llip)) {
				$interfaces["_lloc{$iface}"] = "{$ifacename} IPv6 Link-Local";
			}
		}
	}
	$viplist = get_configured_vip_list();
	foreach ($viplist as $vip => $address) {
		$interfaces[$vip] = $address;
		if (get_vip_descr($address)) {
			$interfaces[$vip] .= " (". get_vip_descr($address) .")";
		}
	}

	$interfaces['lo0'] = 'Localhost';

	return $interfaces;
}

function get_possible_traffic_source_addresses($include_ipv6_link_local=false) {
	global $config;

	$sourceips = get_possible_listen_ips($include_ipv6_link_local);
	foreach (array('server', 'client') as $mode) {
		if (is_array($config['openvpn']["openvpn-{$mode}"])) {
			foreach ($config['openvpn']["openvpn-{$mode}"] as $id => $setting) {
				if (!isset($setting['disable'])) {
					$sourceips_key = 'ovpn' . substr($mode, 0, 1) . $setting['vpnid'];
					$sourceips[$sourceips_key] = gettext("OpenVPN") . " " . $mode . ": " . htmlspecialchars($setting['description']);
				}
			}
		}
	}
	return $sourceips;
}

function get_interface_ip($interface = "wan") {

	if (substr($interface, 0, 4) == '_vip') {
		return get_configured_vip_ipv4($interface);
	} else if (substr($interface, 0, 5) == '_lloc') {
		/* No link-local address for v4. */
		return null;
	}

	$realif = get_failover_interface($interface, 'inet');
	if (!$realif) {
		return null;
	}

	if (substr($realif, 0, 4) == '_vip') {
		return get_configured_vip_ipv4($realif);
	} else if (substr($realif, 0, 5) == '_lloc') {
		/* No link-local address for v4. */
		return null;
	}

	if (is_array($config['interfaces'][$interface]) &&
	    is_ipaddr($config['interfaces'][$interface]['ipaddr'])) {
		return ($config['interfaces'][$interface]['ipaddr']);
	}

	/*
	 * Beaware that find_interface_ip() is our last option, it will
	 * return the first IP it find on interface, not necessarily the
	 * main IP address.
	 */
	$curip = find_interface_ip($realif);
	if ($curip && is_ipaddr($curip) && ($curip != "0.0.0.0")) {
		return $curip;
	} else {
		return null;
	}
}

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

	if (substr($interface, 0, 4) == '_vip') {
		return get_configured_vip_ipv6($interface);
	} else if (substr($interface, 0, 5) == '_lloc') {
		return get_interface_linklocal($interface);
	}

	$realif = get_failover_interface($interface, 'inet6');
	if (!$realif) {
		return null;
	}

	if (substr($realif, 0, 4) == '_vip') {
		return get_configured_vip_ipv6($realif);
	} else if (substr($realif, 0, 5) == '_lloc') {
		return get_interface_linklocal($realif);
	}

	if (is_array($config['interfaces'][$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', false);
				}
				break;
		}
		if (is_ipaddrv6($config['interfaces'][$interface]['ipaddrv6'])) {
			return ($config['interfaces'][$interface]['ipaddrv6']);
		}
	}

	/*
	 * Beaware that find_interface_ip() is our last option, it will
	 * return the first IP it find on interface, not necessarily the
	 * main IP address.
	 */
	$curip = find_interface_ipv6($realif, $flush);
	if ($curip && is_ipaddrv6($curip) && ($curip != "::")) {
		return $curip;
	} else {
		/*
		 * NOTE: On the case when only the prefix is requested,
		 * the communication on WAN will be done over link-local.
		 */
		if ($linklocal_fallback || (is_array($config['interfaces'][$interface]) && isset($config['interfaces'][$interface]['dhcp6prefixonly']))) {
			$curip = find_interface_ipv6_ll($realif, $flush);
			if ($curip && is_ipaddrv6($curip) && ($curip != "::")) {
				return $curip;
			}
		}
	}
	return null;
}

function get_interface_linklocal($interface = "wan") {

	$realif = get_failover_interface($interface, 'inet6');
	if (!$realif) {
		return null;
	}

	if (substr($interface, 0, 4) == '_vip') {
		$realif = get_real_interface($interface);
	} else if (substr($interface, 0, 5) == '_lloc') {
		$realif = get_real_interface(substr($interface, 5));
	}

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

function get_interface_subnet($interface = "wan") {

	if (substr($interface, 0, 4) == '_vip') {
		return (get_configured_vip_subnetv4($interface));
	}

	$realif = get_real_interface($interface);
	if (!$realif) {
		return (NULL);
	}

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

	return (NULL);
}

function get_interface_subnetv6($interface = "wan") {

	if (substr($interface, 0, 4) == '_vip') {
		return (get_configured_vip_subnetv6($interface));
	} else if (substr($interface, 0, 5) == '_lloc') {
		$interface = substr($interface, 5);
	}

	$realif = get_real_interface($interface, 'inet6');
	if (!$realif) {
		return (NULL);
	}

	$cursn = find_interface_subnetv6($realif);
	if (!empty($cursn)) {
		return ($cursn);
	}

	return (NULL);
}

/* return outside interfaces with a gateway */
function get_interfaces_with_gateway() {
	global $config;

	$ints = array();

	/* loop interfaces, check config for outbound */
	foreach ($config['interfaces'] as $ifdescr => $ifname) {
		switch ($ifname['ipaddr']) {
			case "dhcp":
			case "pppoe":
			case "pptp":
			case "l2tp":
			case "ppp":
				$ints[$ifdescr] = $ifdescr;
				break;
			default:
				if (substr($ifname['if'], 0, 4) == "ovpn" ||
				    !empty($ifname['gateway'])) {
					$ints[$ifdescr] = $ifdescr;
				}
				break;
		}
	}
	return $ints;
}

/* 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" || $tunnelif == "gre") {
					if (find_interface_ip($ifname['if'])) {
						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'][$friendly];
		switch ($ifname['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" || $tunnelif == "gre") {
					if (find_interface_ipv6($ifname['if'])) {
						return true;
					}
				}
				if (!empty($ifname['gatewayv6'])) {
					return true;
				}
				break;
		}
	}

	return false;
}

/****f* interfaces/is_altq_capable
 * NAME
 *   is_altq_capable - Test if interface is capable of using ALTQ
 * INPUTS
 *   $int            - string containing interface name
 * RESULT
 *   boolean         - true or false
 ******/

function is_altq_capable($int) {
	/* Per:
	 * http://www.freebsd.org/cgi/man.cgi?query=altq&apropos=0&sektion=0&manpath=FreeBSD+8.3-RELEASE&arch=default&format=html
	 * Only the following drivers have ALTQ support
	 * 20150328 - removed wireless drivers - ath, awi, bwn, iwi, ipw, ral, rum, run, wi - for now. redmine #4406
	 */
	$capable = array("ae", "age", "alc", "ale", "an", "aue", "axe", "bce",
			"bfe", "bge", "bridge", "cas", "dc", "de", "ed", "em", "ep", "epair", "et", "fxp", "gem",
			"hme", "hn", "igb", "ix", "jme", "le", "lem", "msk", "mxge", "my", "nfe",
			"nge", "npe", "nve", "re", "rl", "sf", "sge", "sis", "sk",
			"ste", "stge", "ti", "txp", "udav", "ural", "vge", "vmx", "vr", "vte", "xl",
			"ndis", "tun", "ovpns", "ovpnc", "vlan", "pppoe", "pptp", "ng",
			"l2tp", "ppp", "vtnet");

	$int_family = remove_ifindex($int);

	if (in_array($int_family, $capable)) {
		return true;
	} else if (stristr($int, "l2tp")) { /* VLANs are named $parent_$vlan now */
		return true;
	} else if (stristr($int, "_vlan")) { /* VLANs are named $parent_$vlan now */
		return true;
	} else if (stristr($int, "_wlan")) { /* WLANs are named $parent_$wlan now */
		return true;
	} else {
		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, $g;

	$friendly = convert_real_interface_to_friendly_interface_name($interface);
	if (!isset($config['interfaces'][$friendly]['wireless'])) {
		if (preg_match($g['wireless_regex'], $interface)) {
			if (isset($config['interfaces'][$friendly])) {
				$config['interfaces'][$friendly]['wireless'] = array();
			}
			return true;
		}
		return false;
	} else {
		return true;
	}
}

function get_wireless_modes($interface) {
	/* return wireless modes and channels */
	$wireless_modes = array();

	$cloned_interface = get_real_interface($interface);

	if ($cloned_interface && is_interface_wireless($cloned_interface)) {
		$chan_list = "/sbin/ifconfig {$cloned_interface} list chan";
		$stack_list = "/usr/bin/awk -F\"Channel \" '{ gsub(/\\*/, \" \"); print \$2 \"\\\n\" \$3 }'";
		$format_list = "/usr/bin/awk '{print \$5 \" \" \$6 \",\" \$1}'";

		$interface_channels = "";
		exec("$chan_list | $stack_list | sort -u | $format_list 2>&1", $interface_channels);
		$interface_channel_count = count($interface_channels);

		$c = 0;
		while ($c < $interface_channel_count) {
			$channel_line = explode(",", $interface_channels["$c"]);
			$wireless_mode = trim($channel_line[0]);
			$wireless_channel = trim($channel_line[1]);
			if (trim($wireless_mode) != "") {
				/* if we only have 11g also set 11b channels */
				if ($wireless_mode == "11g") {
					if (!isset($wireless_modes["11b"])) {
						$wireless_modes["11b"] = array();
					}
				} else if ($wireless_mode == "11g ht") {
					if (!isset($wireless_modes["11b"])) {
						$wireless_modes["11b"] = array();
					}
					if (!isset($wireless_modes["11g"])) {
						$wireless_modes["11g"] = array();
					}
					$wireless_mode = "11ng";
				} else if ($wireless_mode == "11a ht") {
					if (!isset($wireless_modes["11a"])) {
						$wireless_modes["11a"] = array();
					}
					$wireless_mode = "11na";
				}
				$wireless_modes["$wireless_mode"]["$c"] = $wireless_channel;
			}
			$c++;
		}
	}
	return($wireless_modes);
}

/* return channel numbers, frequency, max txpower, and max regulation txpower */
function get_wireless_channel_info($interface) {
	$wireless_channels = array();

	$cloned_interface = get_real_interface($interface);

	if ($cloned_interface && is_interface_wireless($cloned_interface)) {
		$chan_list = "/sbin/ifconfig {$cloned_interface} list txpower";
		$stack_list = "/usr/bin/awk -F\"Channel \" '{ gsub(/\\*/, \" \"); print \$2 \"\\\n\" \$3 }'";
		$format_list = "/usr/bin/awk '{print \$1 \",\" \$3 \" \" \$4 \",\" \$5 \",\" \$7}'";

		$interface_channels = "";
		exec("$chan_list | $stack_list | sort -u | $format_list 2>&1", $interface_channels);

		foreach ($interface_channels as $channel_line) {
			$channel_line = explode(",", $channel_line);
			if (!isset($wireless_channels[$channel_line[0]])) {
				$wireless_channels[$channel_line[0]] = $channel_line;
			}
		}
	}
	return($wireless_channels);
}

function set_interface_mtu($interface, $mtu) {

	/* LAGG interface must be destroyed and re-created to change MTU */
	if (substr($interface, 0, 4) == 'lagg') {
		if (isset($config['laggs']['lagg']) &&
		    is_array($config['laggs']['lagg'])) {
			foreach ($config['laggs']['lagg'] as $lagg) {
				if ($lagg['laggif'] == $interface) {
					interface_lagg_configure($lagg);
					break;
				}
			}
		}
	} else {
		pfSense_interface_mtu($interface, $mtu);
	}
}

/****f* interfaces/get_interface_mtu
 * NAME
 *   get_interface_mtu - Return the mtu of an interface
 * RESULT
 *   $tmp       - Returns the mtu of an interface
 ******/
function get_interface_mtu($interface) {
	$mtu = pfSense_interface_getmtu($interface);
	return $mtu['mtu'];
}

function get_interface_mac($interface) {

	$macinfo = pfSense_get_interface_addresses($interface);
	return $macinfo["macaddr"];
}

/****f* pfsense-utils/generate_random_mac_address
 * NAME
 *   generate_random_mac - generates a random mac address
 * INPUTS
 *   none
 * RESULT
 *   $mac - a random mac address
 ******/
function generate_random_mac_address() {
	$mac = "02";
	for ($x = 0; $x < 5; $x++) {
		$mac .= ":" . dechex(rand(16, 255));
	}
	return $mac;
}

/****f* interfaces/is_jumbo_capable
 * NAME
 *   is_jumbo_capable - Test if interface is jumbo frame capable.  Useful for determining VLAN capability.
 * INPUTS
 *   $int             - string containing interface name
 * RESULT
 *   boolean          - true or false
 ******/
function is_jumbo_capable($iface) {
	$iface = trim($iface);
	$capable = pfSense_get_interface_addresses($iface);

	if (isset($capable['caps']['vlanmtu'])) {
		return true;
	}

	// hack for some lagg modes missing vlanmtu, but work fine w/VLANs
	if (substr($iface, 0, 4) == "lagg") {
		return true;
	}

	return false;
}

function interface_setup_pppoe_reset_file($pppif, $iface="") {
	global $g;

	$cron_file = "{$g['varetc_path']}/pppoe_restart_{$pppif}";

	if (!empty($iface) && !empty($pppif)) {
		$cron_cmd = <<<EOD
#!/bin/sh
/usr/local/sbin/pfSctl -c 'interface reload {$iface}'
/usr/bin/logger -t {$pppif} "PPPoE periodic reset executed on {$iface}"

EOD;

		@file_put_contents($cron_file, $cron_cmd);
		chmod($cron_file, 0755);
		sigkillbypid("{$g['varrun_path']}/cron.pid", "HUP");
	} else {
		unlink_if_exists($cron_file);
	}
}

function get_interface_default_mtu($type = "ethernet") {
	switch ($type) {
		case "gre":
			return 1476;
			break;
		case "gif":
			return 1280;
			break;
		case "tun":
		case "vlan":
		case "tap":
		case "ethernet":
		default:
			return 1500;
			break;
	}

	/* Never reached */
	return 1500;
}

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, $g;
	if (isset($config['system']['developerspew'])) {
		$mt = microtime();
		echo "interfaces_staticarp_configure($if) being called $mt\n";
	}

	$ifcfg = $config['interfaces'][$if];

	if (empty($if) || empty($ifcfg['if']) || !isset($ifcfg['enable'])) {
		return 0;
	}

	/* Enable staticarp, if enabled */
	if (isset($config['dhcpd'][$if]['staticarp'])) {
		mwexec("/sbin/ifconfig " . escapeshellarg($ifcfg['if']) . " staticarp ");
		mwexec("/usr/sbin/arp -d -i " . escapeshellarg($ifcfg['if']) . " -a > /dev/null 2>&1 ");
		if (is_array($config['dhcpd'][$if]['staticmap'])) {
			foreach ($config['dhcpd'][$if]['staticmap'] as $arpent) {
				mwexec("/usr/sbin/arp -s " . escapeshellarg($arpent['ipaddr']) . " " . escapeshellarg($arpent['mac']));
			}
		}
	} else {
		mwexec("/sbin/ifconfig " . escapeshellarg($ifcfg['if']) . " -staticarp ");
		mwexec("/usr/sbin/arp -d -i " . escapeshellarg($ifcfg['if']) . " -a > /dev/null 2>&1 ");
		if (is_array($config['dhcpd'][$if]) && is_array($config['dhcpd'][$if]['staticmap'])) {
			foreach ($config['dhcpd'][$if]['staticmap'] as $arpent) {
				if (isset($arpent['arp_table_static_entry'])) {
					mwexec("/usr/sbin/arp -s " . escapeshellarg($arpent['ipaddr']) . " " . escapeshellarg($arpent['mac']));
				}
			}
		}
	}

	return 0;
}

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

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

	/* compare against gateway groups */
	$a_groups = return_gateway_groups_array();
	if (is_array($a_groups[$interface])) {
		/* we found a gateway group, fetch the interface or vip */
		if (!empty($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);
}

function remove_ifindex($ifname) {
	return preg_replace("/[0-9]+$/", "", $ifname);
}

?>
