remove unused routeSlice

Author: MarcoPolo

common.go

@@ -60,23 +60,10 @@ func (rt rtInfo) IsMoreSpecThan(mostSpecificRt *rtInfo) bool {
 	return mostSpecificRt.Priority >= rt.Priority
 }
 
-// routeSlice implements sort.Interface to sort routes by Priority.
-type routeSlice []*rtInfo
-
-func (r routeSlice) Len() int {
-	return len(r)
-}
-func (r routeSlice) Less(i, j int) bool {
-	return r[i].Priority < r[j].Priority
-}
-func (r routeSlice) Swap(i, j int) {
-	r[i], r[j] = r[j], r[i]
-}
-
 type router struct {
 	ifaces map[int]net.Interface
 	addrs  map[int]ipAddrs
-	v4, v6 routeSlice
+	v4, v6 []*rtInfo
 }
 
 func (r *router) String() string {
@@ -132,7 +119,7 @@ func (r *router) RouteWithSrc(input net.HardwareAddr, src, dst net.IP) (iface *n
 	return
 }
 
-func (r *router) route(routes routeSlice, input net.HardwareAddr, src, dst net.IP) (iface int, gateway, preferredSrc net.IP, err error) {
+func (r *router) route(routes []*rtInfo, input net.HardwareAddr, src, dst net.IP) (iface int, gateway, preferredSrc net.IP, err error) {
 	var inputIndex uint32
 	if input != nil {
 		for i, iface := range r.ifaces {

netroute_linux.go

@@ -56,13 +56,12 @@ func (l *linuxRouter) RouteWithSrc(input net.HardwareAddr, src net.IP, dst net.I
 		}
 	}
 
-	ifaces, err := net.Interfaces()
-	if err != nil {
-		return nil, nil, nil, fmt.Errorf("list interfaces: %w", err)
-	}
-
 	var oif int
 	if len(input) > 0 {
+		ifaces, err := net.Interfaces()
+		if err != nil {
+			return nil, nil, nil, fmt.Errorf("list interfaces: %w", err)
+		}
 		for i := range ifaces {
 			iface := ifaces[i]
 			if bytes.Equal(iface.HardwareAddr, input) {

netroute_plan9.go

@@ -55,7 +55,7 @@ func New() (Router, error) {
 	return rtr, nil
 }
 
-func parseIPRoutes() (v4, v6 routeSlice, err error) {
+func parseIPRoutes() (v4, v6 []*rtInfo, err error) {
 	buf, err := os.ReadFile(netdir + "/iproute")
 	if err != nil {
 		return nil, nil, err

netroute_stub.go

@@ -14,7 +14,7 @@ func New() (Router, error) {
 	rtr.ifaces[0] = net.Interface{}
 	rtr.addrs = make(map[int]ipAddrs)
 	rtr.addrs[0] = ipAddrs{}
-	rtr.v4 = routeSlice{&rtInfo{}}
-	rtr.v6 = routeSlice{&rtInfo{}}
+	rtr.v4 = []*rtInfo{&rtInfo{}}
+	rtr.v6 = []*rtInfo{&rtInfo{}}
 	return rtr, nil
 }