From: Jason A. Donenfeld <Jason@zx2c4.com>
Date: Wed, 5 May 2021 09:42:45 +0000 (+0200)
Subject: tun: windows: send MTU update when forced MTU changes
X-Git-Tag: 0.0.20211016~42
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=69a42a4eefc78c2a2e36842fcb26d906101cdae0;p=thirdparty%2Fwireguard-go.git

tun: windows: send MTU update when forced MTU changes

Otherwise the padding doesn't get updated.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---

diff --git a/tun/tun_windows.go b/tun/tun_windows.go
index c8b8d39..70f0aa3 100644
--- a/tun/tun_windows.go
+++ b/tun/tun_windows.go
@@ -148,7 +148,11 @@ func (tun *NativeTun) MTU() (int, error) {
 
 // TODO: This is a temporary hack. We really need to be monitoring the interface in real time and adapting to MTU changes.
 func (tun *NativeTun) ForceMTU(mtu int) {
+	update := tun.forcedMTU != mtu
 	tun.forcedMTU = mtu
+	if update {
+		tun.events <- EventMTUUpdate
+	}
 }
 
 // Note: Read() and Write() assume the caller comes only from a single thread; there's no locking.