From fc5d3c50d2a985614d38895ce02a4c6f07bf4a5c Mon Sep 17 00:00:00 2001
From: Martin Wasley <martin@queens-park.com>
Date: Sun, 10 May 2020 09:22:46 +0100
Subject: [PATCH] Update util.inc

Pull real pd from interface_pdinfo file.
---
 src/etc/inc/util.inc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/etc/inc/util.inc b/src/etc/inc/util.inc
index 92183e79661..a38f4b73ff2 100644
--- a/src/etc/inc/util.inc
+++ b/src/etc/inc/util.inc
@@ -424,7 +424,12 @@ function calculate_ipv6_delegation_length($if)
             break;
         case 'dhcp6':
             $dhcp6cfg = $config['interfaces'][$if];
-            if (is_numeric($dhcp6cfg['dhcp6-ia-pd-len'])) {
+            $realif = get_real_interface($if);
+            if(file_exists("/tmp/{$realif}_pdinfo")){
+                $file_pdinfo = file_get_contents("/tmp/{$realif}_pdinfo");
+                $pdinfo = explode('/',$file_pdinfo);
+                $pdlen = $pdinfo[1];
+            } else if (is_numeric($dhcp6cfg['dhcp6-ia-pd-len'])) {
                 $pdlen = $dhcp6cfg['dhcp6-ia-pd-len'];
             }
             break;