From d1b0a7e7fabff455a8b1b6cb192d3937968c918a Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Thu, 9 Sep 2021 20:29:53 +0000
Subject: driver: device: learn about when MTU notifier begins working

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 driver/device.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/driver/device.c b/driver/device.c
index 2890e41..c718c91 100644
--- a/driver/device.c
+++ b/driver/device.c
@@ -296,7 +296,23 @@ IpInterfaceChangeNotification(
         }
     }
     else if (NotificationType == MibParameterNotification)
+    {
         *Mtu = Row->NlMtu;
+
+        static BOOLEAN HaveNotified;
+        if (!HaveNotified)
+        {
+            HaveNotified = TRUE;
+            RTL_OSVERSIONINFOW OsVersionInfo = { .dwOSVersionInfoSize = sizeof(OsVersionInfo) };
+            RtlGetVersion(&OsVersionInfo);
+            LogInfo(
+                Wg,
+                "MTU notifier working as expected on %u.%u.%u; please notify team@wireguard.com",
+                OsVersionInfo.dwMajorVersion,
+                OsVersionInfo.dwMinorVersion,
+                OsVersionInfo.dwBuildNumber);
+        }
+    }
 cleanupDeviceListLock:
     MuReleasePushLockShared(&DeviceListLock);
 }
-- 
cgit v1.2.3-59-g8ed1b