Add a field to allow rejecting DHCP leases from a specific upstream DHCP server.

2 files changed, 24 insertions, 0 deletions

diff --git a/etc/inc/interfaces.inc b/etc/inc/interfaces.inc
index 29ac9e6..41d326e 100644
--- a/etc/inc/interfaces.inc
+++ b/etc/inc/interfaces.inc
@@ -3550,6 +3550,16 @@ 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;
diff --git a/usr/local/www/interfaces.php b/usr/local/www/interfaces.php
index c315728..7e5d97d 100755
--- a/usr/local/www/interfaces.php
+++ b/usr/local/www/interfaces.php
@@ -175,6 +175,7 @@ if ($wancfg['if'] == $a_ppps[$pppid]['if']) {
 $pconfig['dhcphostname'] = $wancfg['dhcphostname'];
 $pconfig['alias-address'] = $wancfg['alias-address'];
 $pconfig['alias-subnet'] = $wancfg['alias-subnet'];
+$pconfig['dhcprejectfrom'] = $wancfg['dhcprejectfrom'];
 $pconfig['dhcp_plus'] = isset($wancfg['dhcp_plus']);
 $pconfig['descr'] = remove_bad_chars($wancfg['descr']);
 $pconfig['enable'] = isset($wancfg['enable']);
@@ -590,6 +591,8 @@ if ($_POST['apply']) {
 		$input_errors[] = gettext("A valid alias IP address must be specified.");
 	if (($_POST['alias-subnet'] && !is_numeric($_POST['alias-subnet'])))
 		$input_errors[] = gettext("A valid alias subnet bit count must be specified.");
+	if ($_POST['dhcprejectfrom'] && !is_ipaddrv4($_POST['dhcprejectfrom']))
+		$input_errors[] = gettext("A valid alias IP address must be specified to reject DHCP Leases from.");
 	if (($_POST['gateway'] != "none") || ($_POST['gatewayv6'] != "none")) {
 		$match = false;
 		foreach($a_gateways as $gateway) {
@@ -740,6 +743,7 @@ if ($_POST['apply']) {
 		unset($wancfg['subnetv6']);
 		unset($wancfg['gatewayv6']);
 		unset($wancfg['dhcphostname']);
+		unset($wancfg['dhcprejectfrom']);
 		unset($wancfg['dhcp6-duid']);
 		unset($wancfg['dhcp6-ia-pd-len']);
 		unset($wancfg['track6-interface']);
@@ -783,6 +787,7 @@ if ($_POST['apply']) {
 				$wancfg['dhcphostname'] = $_POST['dhcphostname'];
 				$wancfg['alias-address'] = $_POST['alias-address'];
 				$wancfg['alias-subnet'] = $_POST['alias-subnet'];
+				$wancfg['dhcprejectfrom'] = $_POST['dhcprejectfrom'];
 				$wancfg['dhcp_plus'] = $_POST['dhcp_plus'] == "yes" ? true : false;
 				if($gateway_item) {
 					$a_gateways[] = $gateway_item;
@@ -1754,6 +1759,15 @@ $types6 = array("none" => gettext("None"), "staticv6" => gettext("Static IPv6"),
 										</td>
 									</tr>
 									<tr>
+										<td width="22%" valign="top" class="vncell"><?=gettext("Reject Leases From"); ?></td>
+										<td width="78%" class="vtable">
+											<input name="dhcprejectfrom" type="text" class="formfld unknown" id="dhcprejectfrom" size="20" value="<?=htmlspecialchars($pconfig['dhcprejectfrom']);?>" />
+											<br/>
+											<?=gettext("If there is a certain upstream DHCP server that should be ignored, place the IP address or subnet of the DHCP server to be ignored here."); ?>
+											<?=gettext("this is useful for rejecting leases from cable modems that offer private IPs when they lose upstream sync."); ?>
+										</td>
+									</tr>
+									<tr>
 										<td colspan="2" valign="top" height="16"></td>
 									</tr>
 								</table>