fix: 修复 IPv4 头部解析错误

core/engine/engine.go

@@ -160,8 +160,6 @@ func (e *Engine) RoutineTUNReader() {
 			e.errChan <- fmt.Errorf("[RoutineTUNReader]: %s", err)
 			return
 		}
-		fmt.Println(buff[:n])
-
 		ip, err := protocol.ParseIP(buff[:n])
 		if err != nil {
 			e.log.Warningf(e.ctx, "[RoutineRouteTableWriter] drop packet, because %s", err)
@@ -172,6 +170,7 @@ func (e *Engine) RoutineTUNReader() {
 			Dst: ip.Dst(),
 		}
 		copy(payload.Data, buff[:n])
+		fmt.Println(payload.Dst)
 		select {
 		case e.devReader <- payload:
 		default:

core/protocol/ip.go

@@ -25,7 +25,7 @@ func ParseIP(buff []byte) (IP, error) {
 func ParseIPv4(buff []byte) (*IPv4, error) {
 	headerLength := (buff[0] & 0xF0) * 5
 	src := netip.AddrFrom4([4]byte{buff[12], buff[13], buff[14], buff[15]})
-	dst := netip.AddrFrom4([4]byte{buff[15], buff[16], buff[17], buff[18]})
+	dst := netip.AddrFrom4([4]byte{buff[16], buff[17], buff[18], buff[19]})
 
 	return &IPv4{
 		headerLength: int(headerLength),