From dff3d334920c97c50d0be8b54f651f1b13e39470 Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 20 May 2019 14:01:38 +0200
Subject: service: move route monitor and account for changing index

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
---
 service/ifaceconfig.go | 133 -------------------------------------------------
 1 file changed, 133 deletions(-)

(limited to 'service/ifaceconfig.go')

diff --git a/service/ifaceconfig.go b/service/ifaceconfig.go
index ea28ecdc..7d8b2f76 100644
--- a/service/ifaceconfig.go
+++ b/service/ifaceconfig.go
@@ -10,148 +10,15 @@ import (
 	"log"
 	"net"
 	"sort"
-	"time"
 
 	"golang.org/x/sys/windows"
 	"golang.zx2c4.com/winipcfg"
-	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/tun"
 
 	"golang.zx2c4.com/wireguard/windows/conf"
 	"golang.zx2c4.com/wireguard/windows/service/firewall"
 )
 
-func bindSocketRoute(family winipcfg.AddressFamily, device *device.Device, ourLUID uint64, lastLUID *uint64) error {
-	routes, err := winipcfg.GetRoutes(family)
-	if err != nil {
-		return err
-	}
-	lowestMetric := ^uint32(0)
-	index := uint32(0) // Zero is "unspecified", which for IP_UNICAST_IF resets the value, which is what we want.
-	luid := uint64(0)  // Hopefully luid zero is unspecified, but hard to find docs saying so.
-	for _, route := range routes {
-		if route.DestinationPrefix.PrefixLength != 0 || route.InterfaceLUID == ourLUID {
-			continue
-		}
-		ifrow, err := winipcfg.GetIfRow(route.InterfaceLUID)
-		if err != nil || ifrow.OperStatus != winipcfg.IfOperStatusUp {
-			log.Printf("Found default route for interface %d, but not up, so skipping", route.InterfaceIndex)
-			continue
-		}
-		if route.Metric < lowestMetric {
-			lowestMetric = route.Metric
-			index = route.InterfaceIndex
-			luid = route.InterfaceLUID
-		}
-	}
-	if luid == *lastLUID {
-		return nil
-	}
-	*lastLUID = luid
-	if family == windows.AF_INET {
-		log.Printf("Binding UDPv4 socket to interface %d", index)
-		return device.BindSocketToInterface4(index)
-	} else if family == windows.AF_INET6 {
-		log.Printf("Binding UDPv6 socket to interface %d", index)
-		return device.BindSocketToInterface6(index)
-	}
-	return nil
-}
-
-func getIPInterfaceRetry(luid uint64, family winipcfg.AddressFamily, retry bool) (ipi *winipcfg.IPInterface, err error) {
-	const maxRetries = 100
-	for i := 0; i < maxRetries; i++ {
-		ipi, err = winipcfg.GetIPInterface(luid, family)
-		if retry && i != maxRetries-1 && err == windows.ERROR_NOT_FOUND {
-			time.Sleep(time.Millisecond * 50)
-			continue
-		}
-		break
-	}
-	return
-}
-
-func monitorDefaultRoutes(device *device.Device, autoMTU bool, tun *tun.NativeTun) (*winipcfg.RouteChangeCallback, error) {
-	ourLUID := tun.LUID()
-	lastLUID4 := uint64(0)
-	lastLUID6 := uint64(0)
-	lastMTU := uint32(0)
-	doIt := func(retry bool) error {
-		err := bindSocketRoute(windows.AF_INET, device, ourLUID, &lastLUID4)
-		if err != nil {
-			return err
-		}
-		err = bindSocketRoute(windows.AF_INET6, device, ourLUID, &lastLUID6)
-		if err != nil {
-			return err
-		}
-		if !autoMTU {
-			return nil
-		}
-		mtu := uint32(0)
-		if lastLUID4 != 0 {
-			iface, err := winipcfg.InterfaceFromLUID(lastLUID4)
-			if err != nil {
-				return err
-			}
-			if iface.MTU > 0 {
-				mtu = iface.MTU
-			}
-		}
-		if lastLUID6 != 0 {
-			iface, err := winipcfg.InterfaceFromLUID(lastLUID6)
-			if err != nil {
-				return err
-			}
-			if iface.MTU > 0 && iface.MTU < mtu {
-				mtu = iface.MTU
-			}
-		}
-		if mtu > 0 && (lastMTU == 0 || lastMTU != mtu) {
-			iface, err := getIPInterfaceRetry(ourLUID, windows.AF_INET, retry)
-			if err != nil {
-				return err
-			}
-			iface.NLMTU = mtu - 80
-			if iface.NLMTU < 576 {
-				iface.NLMTU = 576
-			}
-			err = iface.Set()
-			if err != nil {
-				return err
-			}
-			tun.ForceMTU(int(iface.NLMTU)) //TODO: it sort of breaks the model with v6 mtu and v4 mtu being different. Just set v4 one for now.
-			iface, err = getIPInterfaceRetry(ourLUID, windows.AF_INET6, retry)
-			if err != nil {
-				return err
-			}
-			iface.NLMTU = mtu - 80
-			if iface.NLMTU < 1280 {
-				iface.NLMTU = 1280
-			}
-			err = iface.Set()
-			if err != nil {
-				return err
-			}
-			lastMTU = mtu
-		}
-		return nil
-	}
-	err := doIt(true)
-	if err != nil {
-		return nil, err
-	}
-	cb, err := winipcfg.RegisterRouteChangeCallback(func(notificationType winipcfg.MibNotificationType, route *winipcfg.Route) {
-		if route.DestinationPrefix.PrefixLength == 0 {
-			_ = doIt(false)
-		}
-	})
-	if err != nil {
-		return nil, err
-	}
-	return cb, nil
-}
-
 func cleanupAddressesOnDisconnectedInterfaces(addresses []*net.IPNet) {
 	if len(addresses) == 0 {
 		return
-- 
cgit v1.2.3-59-g8ed1b