tun: windows: temporary hack for forcing MTU

diff --git a/tun/tun_windows.go b/tun/tun_windows.go
index 4c48af535b7de29b101b3ce35cc2a99cb80f2b67..579e65cc3bf87e17cef8496936f439812bda225a 100644 (file)
--- a/tun/tun_windows.go
+++ b/tun/tun_windows.go
@@ -46,6 +46,7 @@ type NativeTun struct {
        userClose    windows.Handle
        events       chan TUNEvent
        errors       chan error
+       forcedMtu    int
 }
 
 func packetAlign(size uint32) uint32 {
@@ -100,6 +101,7 @@ func CreateTUN(ifname string) (TUNDevice, error) {
                wrBuff:     &exchgBufWrite{},
                events:     make(chan TUNEvent, 10),
                errors:     make(chan error, 1),
+               forcedMtu:  1500,
        }
 
        // Create close event.
@@ -220,7 +222,12 @@ func (tun *NativeTun) Close() error {
 }
 
 func (tun *NativeTun) MTU() (int, error) {
-       return 1500, nil
+       return tun.forcedMtu, nil
+}
+
+//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) {
+       tun.forcedMtu = mtu
 }
 
 func (tun *NativeTun) Read(buff []byte, offset int) (int, error) {