TUN inbound: autoOutboundsInterface bypasses loopback addresses (#6276)

Fixes https://github.com/XTLS/Xray-core/issues/6269

proxy/tun/handler.go

@@ -2,6 +2,8 @@ package tun
 
 import (
 	"context"
+	"net/netip"
+	"strings"
 	"syscall"
 
 	"github.com/xtls/xray-core/common"
@@ -85,6 +87,11 @@ func (t *Handler) Start() error {
 				return nil
 			}
 			return c.Control(func(fd uintptr) {
+				addrPort, _ := netip.ParseAddrPort(address)
+				// skip loopback
+				if addrPort.Addr().IsLoopback() || strings.HasPrefix(strings.ToLower(address), "localhost:") {
+					return
+				}
 				err := setinterface(network, address, fd, iface)
 				if err != nil {
 					errors.LogInfoInner(context.Background(), err, "[tun] falied to set interface")