From e29a4e009dfc461d91268ca3e320973288dcbb91 Mon Sep 17 00:00:00 2001
From: Franco Fichtner <franco@opnsense.org>
Date: Thu, 21 Sep 2023 15:12:47 +0200
Subject: [PATCH] mvc: add isLinkLocal() for #6775

---
 .../mvc/app/library/OPNsense/Firewall/Util.php       | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/opnsense/mvc/app/library/OPNsense/Firewall/Util.php b/src/opnsense/mvc/app/library/OPNsense/Firewall/Util.php
index fa407e729..3c2b9050c 100644
--- a/src/opnsense/mvc/app/library/OPNsense/Firewall/Util.php
+++ b/src/opnsense/mvc/app/library/OPNsense/Firewall/Util.php
@@ -1,7 +1,7 @@
 <?php
 
 /*
- * Copyright (C) 2017-2022 Deciso B.V.
+ * Copyright (C) 2017-2023 Deciso B.V.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -62,6 +62,16 @@ class Util
         return !empty(filter_var($address, FILTER_VALIDATE_IP));
     }
 
+    /**
+     * is provided address an link-locak IPv6 address.
+     * @param string $address network address
+     * @return boolean
+     */
+    public static function isLinkLocal($address)
+    {
+        return !!preg_match('/^fe[89ab][0-9a-f]:/i', $address);
+    }
+
     /**
      * is provided address a mac address.
      * @param string $address network address