netlink: fix RouteUpdate on win and linux

netlink/route_linux.go

@@ -3,6 +3,7 @@ package netlink
 import (
 	"context"
 	"log/slog"
+	"slices"
 
 	"github.com/vishvananda/netlink"
 )
@@ -29,14 +30,13 @@ func RouteSubscribe(ctx context.Context, ch chan<- RouteUpdate) error {
 					Dst: e.Dst,
 					Via: e.Gw,
 				}
-				if e.Type == 24 {
-					ru.Type = 1
-				} else if e.Type == 25 {
-					ru.Type = 2
-				} else {
+				if !slices.Contains([]uint16{24, 25}, e.Type) {
 					slog.Debug("DropUnsupportRouteEvent")
 					continue
 				}
+				if e.Type == 24 {
+					ru.New = true
+				}
 				ch <- ru
 			}
 		}

netlink/route_windows.go

@@ -11,7 +11,7 @@ func RouteSubscribe(ctx context.Context, ch chan<- RouteUpdate) error {
 	cb, err := winipcfg.RegisterRouteChangeCallback(func(notificationType winipcfg.MibNotificationType, route *winipcfg.MibIPforwardRow2) {
 		dst := route.DestinationPrefix.Prefix()
 		ch <- RouteUpdate{
-			Type: uint16(notificationType),
+			New: notificationType == 1,
 			Dst: &net.IPNet{IP: net.IP(dst.Addr().AsSlice()), Mask: net.CIDRMask(dst.Bits(), dst.Addr().BitLen())},
 			Via: net.IP(route.NextHop.Addr().AsSlice()),
 		}