KR100451796B1 - Control apparatus of call processing caching for traffic control - Google Patents

Abstract

In the VoIP gateway, in particular, by inspecting the packet that is the target of the call processing, search the cache, when the IP address of the new destination is found, it is transferred to the user layer and registered in the traffic controller, thereby preventing the loss of the call processing packet It is to prevent.

An apparatus for controlling call processing caching for traffic control according to the present invention includes: an Ethernet interface for transmitting and receiving a packet; Dynamic filtering unit that checks the packet that is the call processing target among the received packets and searches the database to register or delete the IP address, device driver that delivers to the user layer when a new IP address is found, and packets received from the dynamic filtering unit. A kernel comprising a bridging unit for forwarding and a queuing unit for temporarily storing the forwarded packet and delivering the forwarded packet to an Ethernet interface according to a traffic control procedure; A traffic control interrupt flag for polling the device driver to register a new IP address to a traffic controller of a user layer, and a traffic controller requesting registration and deletion of the new IP address into an IP filtering list through a packet scheduler inside a kernel; It is characterized by consisting of a user hierarchy.

Description

Control apparatus of call processing caching for traffic control

The present invention relates to a caching control apparatus that enables traffic control in a traffic condition of a VoIP gateway, particularly in an excessive traffic situation in a Dynamic Host Configuration Protocol (DHCP) server environment.

In general, an internetworking device is a device that widens a network by interconnecting networks, such as a distributed, independent local area network (LAN) connection, or a connection between a LAN and another communication network, such as a bridge or a router. .

Voice over Internet Protocol (VoIP) is a technology that exchanges voice or data over the Internet and converts voice data into IP data packets on a network to enable voice calls such as telephone calls on public telephone networks.

DHCP is the Dynamic Host Configuration Protocol (DHCP) that allows network administrators to centrally manage and assign IP addresses on their networks. This DHCP allows the network administrator to centrally manage and assign IP addresses and automatically send new IP addresses when the computer is connected to another location on the network. DHCP uses the concept of "lease", which allows a given IP address to be valid for that computer for a certain amount of time. The lease time may vary depending on how long the user will need to access the Internet at a particular location.

The DHCP server is a system that temporarily assigns an IP address only while participating in the network in response to a request from the computer participating in the network.

1 is a block diagram showing an apparatus for implementing call processing caching for conventional traffic control.

Referring to FIG. 1, an Ethernet interface 110 for transmitting and receiving a packet, a kernel 120 for a set of protocol elements necessary for establishing a session / connection, data transmission, and the like, and the kernel 120 The user layer 130 is configured to change user configuration information and perform traffic control.

The kernel 120 temporarily stores a protocol decoder 122 for determining whether a protocol for call processing among TCP packets, a bridging unit 122 for forwarding to another interface, and temporarily arrives to the interface to output packets. And a queuing unit 130 having a filter for adjusting the ratio.

In the kernel, flows of the reception and transmission interrupt handlers 121 and 127 for determining the packet delivery order, the configuration information storage unit 125 and the traffic controller tc 132 that store the configuration information changed by the user layer. The configuration includes a scheduler (pktsched) 126 for performing a corresponding command under control.

The call processing caching control apparatus for conventional traffic control as described above will be described with reference to FIG. 1.

When a service request is made at the VoIP gateway, packets arriving at the VoIP gateway are delivered to the kernel 120 through the Ethernet interface 110.

The kernel 120 analyzes all message flows corresponding to a call attempt received by the reception interrupt handler 121, and registers the corresponding IP address in the filter 124a when a call is connected, and the corresponding IP when the call is terminated. The address is removed from the filter.

To this end, the kernel 120 includes a protocol decoder 122, a bridging unit 123, and a queuing unit 124, and the protocol decoder 122 processes any call that arrives. In order to interpret whether the protocol is a protocol for determining whether it is a protocol for processing a desired call among TCP packets.

The bridging unit 123 transmits a packet from one interface to the other interface regardless of the upper IP layer in the portion corresponding to the data link layer in the OSI model.

The queuing unit 124 temporarily adjusts the service rate by temporarily storing the arriving packets during the transfer to the interface to be output.

Therefore, the packet arriving at the kernel 120 is delivered to the protocol decoder 122 by the reception interrupt handler 121, and when the call is connected, the protocol decoder 122 performs analysis on all call processing packets, and then registers them. It is checked whether the registered IP is a registered IP, and if it is a registered IP, it is registered in the IP filtering list of the filter 124a of the queuing unit 124.

As a result, the filter 124a filters the sender / recipient IP address to restrict the passage of packets having a specific source address, source address, or the like.

In addition, when the call ends, the corresponding IP address is removed from the filter of the queuing unit 124.

The packet arriving at the kernel 120 is processed by the protocol decoder 122 according to the Linux network processing routines (netif_rx, net_rx_action), and then forwarded to the other interface by the bridging unit 123, and then to the Linux network processing routine (dev_queue_xmit). Along with the queuing unit 124. The queuing unit 124 passes through the queuing process according to the traffic state and is delivered to the Xmit Handler 127. The transmission handler 127 transmits the packet received from the kernel 120 to the corresponding IP through the Ethernet interface 110.

In addition, the configuration information is changed in the user layer 130 or the configuration information changed in the dynamic filter unit 122 is stored in the configuration information storage unit (axvq_global_config) 125 of the kernel 122 and the user layer is stored. According to the traffic control message of the traffic controller (tc) 132 (130), the packet scheduler (pktsched) 126 controls the filter of the queuing unit 124 to control the traffic.

As such, when the call is attempted at the VoIP gateway, all the corresponding message flows are analyzed, and when the call is connected, the corresponding IP address is registered in the filter. After the call, the IP address is removed.

However, conventionally, since all the call processing packets need to be analyzed, the performance of the process may be degraded. Also, if excessive traffic occurs after the call processing, the packet for call processing may be lost. There is no problem.

The present invention examines a packet that is a call processing target among packets received from a LAN interface, searches for an actual cache, passes it to the user layer when a new target IP address is found, and polls from the device driver of the user layer. The present invention provides a call processing caching controller for traffic control that allows a new IP address to be registered in a traffic controller.

Another feature is to check whether the packet corresponding to the address already registered is a packet for voice processing, if it is a voice-related packet, update the arrival time information, and in the packet transmitted from the gatekeeper to determine the voice-related packet, the IP of the server. The present invention provides a call processing caching controller for traffic control that allows recording of an address, a UDP port number, an IP address of a call controller, and a TCP port number.

In addition, the present invention provides a call processing caching control apparatus for traffic control to remove the voice-related packet from the IP address registered in the database for a certain time to remove it from the database and also from the IP filtering list.

1 is a block diagram showing a call processing caching control apparatus for conventional traffic control.

2 is a block diagram illustrating an apparatus for controlling call processing caching for traffic control according to an exemplary embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

210 ... Ethernet Interface 220 ... Kernel

230 ... User Layer 221 ... Receive Interrupt Handler

222 Dynamic Filtering Section 223 Bridging Section

224 Queuing unit 225 Configuration information storage unit

227 ... Device Driver 227 ... Packet Scheduler

Transmit handler 232 Traffic control interrupt flag

Call control processing caching control device for traffic control according to an embodiment of the present invention,

An Ethernet interface for transmitting and receiving packets;

Dynamic filtering unit that scans the database for incoming call processing and registers or deletes the IP address, device driver delivering to the user layer when a new IP address is found, and packet received from the dynamic filtering unit. A kernel comprising a forwarding bridging unit and a queuing unit for temporarily storing the forwarded packet and delivering the forwarded packet to an Ethernet interface according to a traffic control procedure;

A traffic control interrupt flag for polling the device driver to register a new IP address to a traffic controller of a user layer, and a traffic controller requesting registration and deletion of the new IP address into an IP filtering list through a packet scheduler inside a kernel; It is characterized by consisting of a user hierarchy.

Preferably, the dynamic filtering unit checks a source IP address for all transmission packets, a destination IP address for all received packets, and stores the packet for voice processing on a registered IP address. It is characterized by checking whether the packet.

Preferably, the dynamic filtering unit records the IP address of the server, the UDP port number, the IP address of the call controller, and the TCP port number in a database in a packet transmitted from a gatekeeper to determine a voice related packet.

Preferably, the dynamic filtering unit registers the source IP address of the packet in an IP filtering list.

Referring to the accompanying drawings, a call processing caching control apparatus for controlling traffic according to the present invention as described above is as follows.

First, the Ethernet interface 210 is a physical layer that receives a packet and delivers the received packet to a destination address. The kernel 220 inspects a packet that is a call processing target among the packets received from the Ethernet interface 210 and searches and inputs an actual cache.

To this end, inside the kernel 220, an Arriving Interrupt Handler 221, a dynamic filtering 222, a bridging 223, a queuing 224, and a user and information change. Configuration information storage (axvq_global_config) 225, a device driver (Axvq_Tcintf Char driver) 226, a packet scheduler (pksched) 227, and a transmit interrupt handler (Xmit Handler) 228.

The reception interrupt handler 221 in the kernel determines the delivery order of the received packets to the dynamic filtering unit 222, and the dynamic filtering unit 222 registers the IP of the packets received from the reception interrupt handler 221. It checks whether a packet is dropped or a doorman.

That is, the dynamic filtering unit 222 checks whether the source IP address is registered in the database (DB) 222a for all the transport packets. If the address is already registered (Registered IP), it is checked whether the corresponding packet is a packet for voice processing, and if the packet is voice related, update time of arrival information is updated. Thereafter, the voice-related packet is transferred as before with the normal packet processing procedure.

If the received packet is a new IP, the dynamic filtering unit 222 checks whether a destination IP address and a UDP port number are a doorman. The source IP address, gatekeeper destination IP address, and UDP port number are inserted into the database 222a (Insert GW IP) and registered. The source IP address of the packet is registered in the IP filtering list. Similarly, these packets are forwarded to the normal processing procedure as before.

In addition, the dynamic filtering unit 222 checks whether the destination IP address is registered in the database 222a for all received packets. If the address is already registered, it is checked whether the corresponding packet is a packet for voice processing. It records the IP address of the OPAL server, the UDP port number, the IP address of the call controller, and the TCP port number in the packet transmitted from the gatekeeper to determine received voice-related packets later.

Meanwhile, the device driver 226 in the kernel requests ADD tc to register the IP address registered in the database 222a of the dynamic filtering unit 222, and from the IP address registered in the database 222a for a predetermined time. If a voice related packet does not occur, it is requested to remove it from the database 222a and to remove it from the IP filtering list (DELETE tc).

The configuration information storage unit 225 stores configuration information (axvqconfig), such as doorman udp1, doorman udp2, and doorman ageingtime, which are changed in the user hierarchy.

The device driver 226 in the kernel passes the request to the user layer 230 when a new target IP address is found by the request of the database 222a, and the traffic control flag of the user layer 230 (tcintf: traffic). control Interruptflag) 232 polls at the request of the device driver 226 to command the new IP address to the traffic controller 233 (Running shell command), the traffic controller 233 is a packet scheduler 227 The data is transmitted to the queuing unit 224 and registered in the filter 224a. In addition, the IP address is requested to be deleted for a corresponding IP address that has not generated a voice-related packet for a predetermined time.

Meanwhile, the kernel 220 forwards the packet down to the dynamic filtering unit 222 to the bridging unit 223 as a Linux network processing routine (netif_rx, net_rx_action) for forwarding, and forwards the forwarded packet. Is queued to the queuing unit 224 by a Linux network processing routine (dev_queue_xmit) and then transmitted by the send handler 228 via the Ethernet interface 210.

At this time, the filter 224a of the queuing unit 224 restricts the passing of a packet having a specific source address or source address according to the IP address registered in the filtering list, and determines the sender / receiver IP address or the TCP / UDP port number. Based on the packet filtering.

In this way, the kernel does not need to analyze all call processing packets, and even if excessive traffic occurs after call processing, the call processing packets are not lost, and thus can be processed as filtering itself.

As described above, according to the call processing caching control apparatus for traffic control according to the present invention, it is determined whether the source IP address and the destination IP address are registered in the database, and whether the registered address is a packet for voice processing. By doing so, it is possible to prevent the performance degradation of the process by eliminating the need to analyze all call processing packets.

In addition, even if excessive traffic occurs after the call processing, the packet for call processing is not lost, and thus the filtering itself can be processed.

Claims (4)

An Ethernet interface for transmitting and receiving packets; Dynamic filtering unit that checks the packet that is the call processing target among the received packets and searches the database to register or delete the IP address, device driver that delivers to the user layer when a new IP address is found, and packets received from the dynamic filtering unit. A kernel comprising a bridging unit for forwarding and a queuing unit for temporarily storing the forwarded packet and delivering the forwarded packet to an Ethernet interface according to a traffic control procedure; A traffic control interrupt flag for polling the device driver to register a new IP address to a traffic controller of a user layer, and a traffic controller requesting registration and deletion of the new IP address into an IP filtering list through a packet scheduler inside a kernel; Call processing caching controller for traffic control, characterized in that configured as a user layer. The method of claim 1, The dynamic filtering unit checks whether the source IP address is stored in the database for all transmission packets and the destination IP address for all the received packets, and then checks whether the packet is a voice processing packet for the registered IP address. Call processing caching controller for traffic control, characterized in that the inspection. The method of claim 1, The dynamic filtering unit records the IP address of the server, the UDP port number, the IP address of the call controller, and the TCP port number in a packet transmitted from the gatekeeper to determine a voice related packet in a database. Caching Controls. The method of claim 3, wherein And the dynamic filtering unit registers the source IP address of the packet in the IP filtering list of the queuing unit.