KR101074124B1 - Method for processing received packet using transport driver interface in mobile terminal - Google Patents

Abstract

A received packet processing method performed in a mobile terminal using tunneling to provide mobility of a terminal is disclosed. A received packet processing method performed in a mobile terminal includes: receiving a packet from an IP network; And processing the received packet only within a kernel layer to allow the IP layer of the kernel layer to receive a UDP (User Datagram Protocol) datagram. This improves the packet reception processing performance of the tunnel network interface.

Description

Method for processing received packet using transport driver interface in mobile terminal}

The present invention relates to network technology, and more particularly, to a technology for providing mobility of a mobile terminal using a tunneling scheme in an Internet Protocol (IP) network.

This study was derived from the research conducted as part of the IT growth engine technology development project of the Ministry of Knowledge Economy and the Ministry of Information and Telecommunications Research and Development. [Task Management Number: 2007-S-013-02, All IP-based Fixed-Mobile Convergence Networking Technology] Development]

In the network field, many studies have been conducted to provide seamless Internet service even when a terminal moves to another IP network using the All IP network, and a packet is transmitted in a tunneling manner by assigning a unique IP address to a mobile terminal. How to ensure that is well known. Here, the unique IP address assigned to the mobile terminal is called home address.

In the tunneling scheme, the mobile terminal always recognizes the home address assigned to the network as an address reachable to the network, and applications of the mobile terminal communicate using the home address, while the mobile terminal moves to another IP. Care of Address (CoA), an IP address that changes as it enters the network, is used as a means of transporting the original IPv6 packet. In other words, applications using the home address pass <current IP network information of the terminal and current IP network information of the other node> to deliver the correct packet to the other node through the IP network that the terminal is currently visiting. To tunnel the packet.

In general, IP over IP tunneling is used, which has limitations in the case where the visiting network uses NAT (Network Address Translation) or an enterprise network in which the firewall is installed in the visiting network. This is not commonly used and IP over IP-UDP tunneling is used instead (see RFC4380).

When IP over IP-UDP tunneling is used to provide mobility of the mobile terminal, the mobile terminal may be equipped with Microsoft's Windows Desktop operating system. The Windows Desktop operating system may include Windows XP, Windows Vista, and the like. Under the Windows Desktop operating system, a tunnel interface based on NDIS (Network Driver Interface Specifiaction) is generally used to realize the above tunneling method. This tunnel network interface does not control the actual physical network adapter, but exists as a virtual network interface to handle encapsulation and decapsulation of packets.

In order to receive the packet encapsulated by IP-UDP information, the tunnel network interface creates a UDP socket at the application layer and transfers the received UDP datagram to the tunnel network interface of the kernel layer. However, this method has a problem in that packet processing performance is inferior because a packet must be transferred between the application layer and the kernel layer each time a packet encapsulated with IP-UDP information is processed.

In using the IP over IP-UDP tunneling scheme to provide mobility of the mobile terminal in the IP network, the terminal using the Windows Desktop operating system uses an NDIS-based tunnel network interface. When receiving packet encapsulated by IP-UDP, the method of receiving UDP datagram at the application layer and delivering the packet to the tunnel network interface at kernel layer significantly reduces packet processing performance due to unnecessary packet forwarding load. To solve the problem.

According to an aspect of the present invention, there is provided a method for processing a received packet, which is performed in a mobile terminal using a tunneling technique to provide mobility of a terminal, the method comprising: receiving a packet from an IP network; And processing the received packet only within the kernel layer to allow the IP layer of the kernel layer to receive a UDP (User Datagram Protocol) datagram.

According to an aspect of the present invention, the mobile terminal provides mobility of the terminal using IP over IP-UDP tunneling.

According to an aspect of the present invention, the processing of the IP layer to receive a UDP datagram may include: transmitting the received packet to a transport driver interface (Client) interface client in a user datagram protocol (UDP) layer; Forwarding, by the transport driver interface client, the packet received from the UDP layer to the tunnel network interface; And forwarding, by the tunnel network interface, the packet received from the transport driver interface client to the IP layer.

On the other hand, the received packet processing method performed in a mobile terminal using a tunneling technique to provide the mobility of the terminal according to another aspect of the present invention for achieving the above technical problem, the tunnel network interface; Generating a transport driver interface client through which the tunnel network interface listens for a specific UDP port number; Delivering, by the physical network interface, the packet received from the IP network to the IP layer; Delivering, by the IP layer, a packet received from the physical network interface to a UDP layer; Sending by the UDP layer to the transport driver interface client that is listening for a particular UDP port number; Forwarding, by the transport driver interface client, the packet received from the UDP layer to the tunnel network interface; And forwarding, by the tunnel network interface, the packet received from the transport driver interface client to the IP layer.

In processing packets encapsulated in IP-UDP format, by using the TDI interface, UDP datagrams can be received without intervention of the application program layer, thereby significantly improving the processing performance of packets encapsulated in IP-UDP format.

The foregoing and further aspects of the present invention will become more apparent through the preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

1 is an exemplary diagram illustrating a tunneling scheme for providing mobility of a mobile terminal, and FIG. 2 is an exemplary diagram of packet encapsulation.

The mobile terminal 104 uses the tunnel 106 to communicate with the other node 101 through the IP network 102. This tunnel 106 is a tunnel established by using the IP network information of the network # 1 103 that the mobile terminal 103 is visiting and the IP network information of the counterpart node 101. That is, in order for the counterpart node 101 to transmit a packet to the mobile terminal 104, the original packet as shown by reference numeral 201 is encapsulated and sent as shown by reference numeral 203, and on the contrary, the mobile terminal 104 transmits the packet to the counterpart node 101. In order to transmit a packet to an original packet, an original packet such as 203 is encapsulated and transmitted as shown in 204. At this time, if the mobile terminal 104 moves from the visited network # 1 103 to the visited network # 2 105, the mobile terminal 104 replaces the visited network # 2 (105) instead of the CoA of the visited network # 1 103. The encapsulation is performed as CoA of the reference numeral 202 and 204. This method is called IP over IP tunneling. As described above, this method is not suitable for NAT or enterprise networks, and IP over IP-UDP tunneling is used. However, when using the IP over IP-UDP tunnel, the NDIS tunnel network interface has no direct way of receiving datagrams encapsulated by IP-UDP.

3 is a reference diagram for explaining packet reception processing of a mobile terminal.

The physical network interface 308 receives the packet from the IP network 309, removes the layer 2 header of the received packet, and forwards the packet to the IP layer 306. The packet delivered to the IP layer 306 is shown at 351. The IP layer 306 processes the outer IP header of the received packet and transfers it to the UDP layer 305. A packet transmitted to the UDP layer 305 is the same as that of the reference numeral 352. After processing the UDP header, the UDP layer 305 transfers the UDP header to the UDP socket of the application layer 302 through the socket layer 303. The packet delivered to the application layer 302 is after both the outer IP header and the UDP header are decapsulated as shown by reference numeral 353. The application layer 302 forwards the packet 354 to the tunnel network interface 307 for processing of the received packet. Tunnel network interface 307 forwards the forwarded packet to IP layer 306 so that normal IP packets are processed as if they were received from IP network 309. As such, in the processing method as shown in FIG. 3, each time the packet encapsulated by the IP-UDP header is processed, the packet is delivered from the kernel layer to the application layer, and then, the packet is delivered to the tunnel network interface in the kernel layer. The resulting load causes a significant drop in packet processing performance.

Thus, according to an aspect of the present invention, a method for processing a received packet without passing it to the application will be described.

4 is a model structure diagram of a network stack in a Windows Desktop operating system.

NIC Driver and NIC are actually the NDIS drivers that control a network interface card (NIC). The transport provider layer refers to a network protocol stack such as TCP / IP. In addition, TDI (Transport Driver Interface) Client is a layer that enables to implement Socket Emulator, NetBIOS Emulator, Redirectors, Servers using TDI Interface provided by Transport Provider. As an example, the socket interface used by an application is implemented using a TDI client. By using the TDI client, UDP datagrams can be received directly from the kernel layer, eliminating the need to receive and process packets unnecessarily at the application layer.

5 is a reference diagram for describing a received packet processing of a mobile terminal according to an embodiment of the present invention.

Shows the process of receiving packet using TDI Clinet. The physical network interface 507 receiving the frame from the IP network 508 processes the two-layer header and forwards it to the IP layer 505. After processing the outer IP header, the IP layer 505 forwards the packet 552 to the UDP layer 503. After processing the UDP header, the UDP layer 503 delivers the packet 553 to the TDI client 502 waiting for a specific UDP port number in advance. Accordingly, the TDI client 502 forwards the packet 554 to the tunnel network interface 506 in the kernel area, and the tunnel network interface 506 forwards the packet 555 to the IP layer 505.

6 is a flowchart illustrating a TDI client generation according to an embodiment of the present invention, FIG. 7 is a flowchart illustrating a received packet processing according to an embodiment of the present invention, and FIG. 8 is a flowchart illustrating a TDI client termination according to an embodiment of the present invention. .

Initialization is required for the TDI client to receive UDP datagrams normally. This is usually requested by the application program that is responsible for initializing the tunnel network interface. At this time, the UDP port number to be listened to is transmitted to the tunnel network interface. In response to the initialization request, the tunnel network interface 506 performs initialization and generates a TDI client 502 waiting for the received UDP port number (step S610) (step S620). After the initialization is completed, the physical network interface 507 processes the two-layer header of the packet received from the IP network and transfers it to the IP layer 505 (step S710). After processing the outer IP header, the IP layer 505 forwards the packet to the UDP layer 503 (step S720), and the UDP layer 503 sends the packet to the TDI client 502 waiting for the UDP port number. (Step S730). The TDI Client 502 forwards the received packet to the tunnel network interface (step S740), and the tunnel network interface 506 forwards the original packet to the IP layer 505 (step S750). On the other hand, when the tunnel network interface 506 is terminated, the existing TDI client 502 is terminated together (step S810) (step S820).

So far I looked at the center of the preferred embodiment for the present invention. Those skilled in the art will appreciate that the present invention can be implemented in a modified form without departing from the essential features of the present invention. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. The scope of the present invention is shown in the claims rather than the foregoing description, and all differences within the scope will be construed as being included in the present invention.

1 is an exemplary diagram for explaining a tunneling scheme for providing mobility of a mobile terminal.

2 illustrates packet encapsulation.

3 is a reference diagram for explaining received packet processing of a mobile terminal.

4 is a model structure diagram of a network stack in a Windows Desktop operating system.

5 is a reference diagram for explaining a received packet processing of a mobile terminal according to an embodiment of the present invention.

6 is a flowchart of generating a TDI client according to an embodiment of the present invention.

7 is a flowchart illustrating a received packet processing according to an embodiment of the present invention.

8 is a flowchart illustrating a termination of a TDI client according to an embodiment of the present invention.

Claims (9)

In the received packet processing method performed in a mobile terminal using a tunneling technique to provide mobility of the terminal, Receiving a packet from an IP network; And Processing the received packet only within a kernel layer to allow an IP layer of a kernel layer to receive a UDP (User Datagram Protocol) datagram; Receive packet processing method comprising a. The method of claim 1, The mobile terminal uses a network driver interface specification (NDIS) tunnel interface in a terminal equipped with a Windows desktop operating system. The method of claim 1, The mobile terminal is a method for processing a received packet, characterized in that to provide the mobility of the terminal using IP over IP-UDP tunneling. The method of claim 3, wherein the processing of the IP layer to receive a UDP datagram comprises: Delivering the received packet to a transport driver interface (TDI) client in a user datagram protocol (UDP) layer; Forwarding, by the transport driver interface client, a packet received from the UDP layer to a tunnel network interface; And Forwarding, by the tunnel network interface, a packet received from the transport driver interface client to an IP layer; Receive packet processing method comprising a. 5. The method of claim 4, The forwarding to the tunnel network interface may include forwarding to the transport driver interface client that is waiting for a specific UDP port number in advance. In the received packet processing method performed in a mobile terminal using a tunneling technique to provide mobility of the terminal, Initializing the tunnel network interface; Generating a transport driver interface (TDI) client in which the tunnel network interface listens for a specific UDP port number; Delivering, by the physical network interface, the packet received from the IP network to the IP layer; Forwarding, by the IP layer, a packet received from the physical network interface to a UDP layer; Transmitting by the UDP layer to the transport driver interface client that is waiting to receive the specific UDP port number; Forwarding, by the transport driver interface client, a packet received from the UDP layer to a tunnel network interface; And Forwarding, by the tunnel network interface, a packet received from the transport driver interface client to the IP layer; Receive packet processing method comprising a. The method of claim 6, Terminating the tunnel network interface; Terminating the transport driver interface client generated upon initialization of the tunnel network interface upon termination of the tunnel network interface; Receiving packet processing method further comprising. The method of claim 6, The mobile terminal uses a network driver interface specification (NDIS) tunnel interface in a terminal equipped with a Windows desktop operating system. The method of claim 8, The mobile terminal is a method for processing a received packet, characterized in that to provide the mobility of the terminal using IP over IP-UDP tunneling.

Images