JP2004235904A - Apparatus, system, method, and program for managing session information - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To speed up attainment of a specified function to be performed by a session information function means, by increasing the efficiency of session management in a TCP/IP management means and the session information function means. <P>SOLUTION: A session information table 121 performs storage relating session information in a TCP/IP process 12 with table numbers. These table numbers comprise a table number in the information table 121, and a table number being used in a session information subtable 131 with respect to one piece of session information. The information subtable 131 performs storage relating session information in an IP address conversion process 13 with table numbers. These table numbers comprise table numbers being used in both tables respectively, with respect to one piece of session information. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a session information management apparatus, system, method, and program that realizes a predetermined function by managing and utilizing session information such as an IP address (Internet Protocol Address) conversion function in a proxy server.
[0002]
[Prior art]
Conventionally, BSD (Berkeley Software Distribution) software has an IP address conversion (IP masquerade function) implemented, but originally, a session of TCP (Transmission Control Protocol) and a UDP (User Datagram Protocol) for managing a session of a process / IP of a TCP / User Datagram Protocol. The IP address conversion process is independent.
Also, session management (management of session information) is performed by a TCP / IP process and an IP address conversion process. Basically, management is performed by identifying a unique session with four items of an incoming and outgoing IP address and an outgoing and incoming port number. Is going.
[0003]
Such a conventional session information management system will be described using an IP address conversion system as an example with reference to FIGS.
As shown in FIG. 5, the conventional IP address conversion system includes a client 2, an external network 3, a proxy server 9 that relays the connection of the client 2 to the external network 3, and a server 4 that stores contents. Prepare.
When accessing the content stored in the server 4 from the client 2 via the external network 3, the proxy server 9 converts the local address of the client 2 into a global address, and accesses the server 4 using the global address. I do.
[0004]
In this conventional IP address conversion system, the operation between the client 2 and the proxy server 9 when the client 2 transmits a synchronization signal packet (SYN (Synchronous) packet) for establishing a connection with reference to FIG. Will be explained.
First, when a SYN packet is transmitted from the client 2, the TCP / IP process 92 having received the SYN packet creates and manages session information, and transmits the SYN packet to the IP address conversion process 93.
Upon receiving the SYN packet, the IP address conversion process 93 creates session information, performs address conversion, and transmits the SYN packet after the address conversion to the proxy operation unit 91.
[0005]
Next, the operation of the client 2 and the proxy server 9 when the client 2 transmits a DATA packet in the above-described conventional IP address conversion system will be described with reference to FIG.
First, when a DATA packet is transmitted from the client 2, the TCP / IP process 92 having received the DATA packet creates and manages session information, and transmits the DATA packet to the IP address conversion process 93.
The IP address conversion process 93 that has received the DATA packet creates session information and performs address conversion, and transmits the DATA packet after the address conversion to the proxy operation unit 91.
[0006]
Next, a description will be given of a specific example of exchange of information and each table when performing address conversion of a SYN packet in the above-described conventional IP address conversion system with reference to FIG.
The TCP / IP process 92 creates session information tables 921 by compiling session information of the incoming / outgoing IP address and the incoming / outgoing port number sent when the SYN packet is transmitted, and manages the session information.
Further, the IP address conversion process 93 collects session information of the incoming / outgoing IP address, the incoming / outgoing port number, the converted IP address, and the converted port number, creates a session information sub-table 931 and manages the session information.
[0007]
As described above, in the conventional IP address translation system, the TCP / IP process 92 and the IP address translation process 93 in the proxy server 9 operate independently of each other, and when the transmitted packet is received, Independently manages session information.
[0008]
Further, an address operation processing device disclosed in Japanese Patent Application Laid-Open No. 2000-253020 (Patent Document 1) is a communication system including a plurality of LANs for performing IP communication, an ATM transmission device connecting them, and an ATM exchange. When a packet is received, the source and destination addresses of the IP packet are extracted, the IP address is converted to an IP compatible ATM address, and the ATM cell is transmitted to the ATM network.
This makes it unnecessary to use an address translation server.
[0009]
[Patent Document 1]
JP 2000-253020 A
[0010]
[Problems to be solved by the invention]
However, in the conventional session information management system, the TCP / IP process and the session information function means for managing the session information and realizing a predetermined function (such as the IP address conversion process in the above example) operate independently. However, since both use and manage session information, such as searching for session information, the time taken by the session information function means increases in proportion to the number of sessions. Was.
For example, using the above-described example of the IP address conversion system, in other words, since the session management is performed solely by the IP address conversion process, there is a problem that the IP address conversion takes time in proportion to the increase in the number of sessions. .
[0011]
Also, the above-mentioned patent document 1 is a preferable one in which the need for setting an SVC for address resolution in the address translation server is eliminated by eliminating the need for the address translation server. The fact that the management is performed independently does not take into account that the processing by the session information function means takes a long time in proportion to the increase in the number of sessions.
[0012]
SUMMARY OF THE INVENTION The present invention has been made in view of such a situation, and by improving the efficiency of session management in a TCP / IP process (TCP / IP management means) and a session information function means, a predetermined information by the session information function means is provided. It is an object of the present invention to provide a session information management device, a system, a method, and a program which can speed up the realization of the above function and can operate at high speed even when the number of sessions is large.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has the following features.
According to a first aspect of the present invention, there is provided a session information management apparatus including: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information to realize a predetermined function. , A TCP / IP management unit includes a first session information table for storing specific information (for example, a table number) for specifying a table position in association with session information, and a specific function for specifying the table position. A request transmission unit for transmitting to the session information function means together with the request for realizing the request, wherein the session information function means stores a second session information table for storing identification information for specifying a table position in association with the session information; Transmits specific information for specifying the table position to the TCP / IP management means together with a response to the realization request. Comprising a response transmitter, and a first session information table, and the second session information table, specific information for specifying the table position for one session information, characterized by sharing with each other.
[0014]
According to a second aspect of the present invention, there is provided a session information management apparatus comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information to realize a predetermined function. , A TCP / IP management means, a first session information table for storing specific information for specifying a table position in association with session information, and a session information function for storing the specific information for specifying the table position together with a request for realizing a predetermined function. A request transmitting unit for transmitting to the means, wherein the session information function means stores a second session information table for storing the specific information for specifying the table position in association with the session information; and the specific information for specifying the table position. And a response transmitting unit that transmits to the TCP / IP management means together with a response to the realization request, The P / IP management unit stores the identification information identifying the table position of the one session information in the second session information table transmitted from the session information function unit into the one session information in the first session information table. The session information function means stores identification information for specifying a table position in the first session information table for the one session information transmitted from the TCP / IP management means, in the second session information table. Is stored in association with the one session information.
[0015]
According to a third aspect of the present invention, when a realization request for a predetermined function is input, the TCP / IP management means searches the first session information table based on the realization request, and the search fails. In the case, the session information is stored as new in the first session information table, and when the search is successful, the specific information for specifying the table position associated with the searched session information is transmitted to the session information function means. The session information function means realizes a predetermined function using the transmitted identification information for identifying the table position.
[0016]
According to a fourth aspect of the present invention, the predetermined function is an IP address conversion function, and the request for realizing the predetermined function is an IP address conversion request.
[0017]
According to a fifth aspect of the present invention, there is provided a session information management system including the session information management device according to any one of the first to fourth aspects and a client connected to the session information management device. The information management device realizes a predetermined function in response to a request from a client.
[0018]
According to a sixth aspect of the present invention, there is provided a session information management system including the session information management apparatus according to the fourth aspect and a client connected to the session information management apparatus, wherein the session information management apparatus transmits the session information from the client. The obtained local address is converted into an IP address.
[0019]
According to a seventh aspect of the present invention, there is provided a session information management apparatus comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information to realize a predetermined function. A first session information table for storing, when a request for realizing a predetermined function is received, specific information (for example, a table number) for specifying a table position in association with session information in a TCP / IP management unit; A search step based on the realization request, and when the search in the search step fails, the first session information table and the second session information table in the session information function means store the realization request And storing the session information in the table with the specific information that specifies the table position Then, if the specific information specifying the table position in the other table is stored with each other, and the search in the search step is successful, the session information function means specifies the table position associated with the searched session information. A predetermined function is realized by referring to the second session information table based on the information.
[0020]
The invention according to claim 8 provides session information in a session information management apparatus comprising: TCP / IP management means for managing a TCP session; and session information function means for managing session information to realize a predetermined function. In the management method, when a request for realizing a predetermined function is received, a first session information table that stores session information in a TCP / IP management unit in association with specific information for specifying a table position is stored based on the realization request. If the search in the search step fails, the first session information table stores the session information in the realization request in association with the specific information for specifying the table position, and manages the TCP / IP. Means for transmitting the function realization request to the session information function means; The specific information specifying the table position in the session information in the table is transmitted, and the session information function unit stores the specific information specifying the transmitted table position in the second session information table in association with the session information. And transmitting, to the TCP / IP management means, the identification information specifying the table position in the second session information table associated with the session information, together with a response to the function realization request, and the TCP / IP management means The identification information for identifying the table position in the transmitted second session information table is stored in association with the session information in the first session information table, and when the search in the search step is successful, the search is performed. Specific information specifying the table position associated with the session information Sends the session information function unit, the session information function unit refers to the second session information table based on identification information for identifying the transmitted table position, characterized in that to achieve a predetermined function.
[0021]
According to a ninth aspect of the present invention, there is provided a session information management apparatus comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and realizes a predetermined function. When a request for realizing a predetermined function is received by the session information management device, the management program stores the session information in the TCP / IP management means in association with specific information (for example, a table number) for specifying a table position. A search process for searching the first session information table based on the realization request is executed, and when the search in the search process fails, the first session information table and the second session information in the session information function means In the table, specify the table position in the session information in the realization request. The specific information specifying the table position in the other table is stored together with the specific information to be stored, and if the search in the search processing is successful, the session information function means associates the searched session information with the searched session information. The second session information table is referred to based on the specified information for specifying the specified table position, and a predetermined function is realized.
[0022]
According to a tenth aspect of the present invention, there is provided a session information management apparatus comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and realizes a predetermined function. A management program, when receiving a request for realizing a predetermined function from a session information management device, stores a first session information table that stores session information in a TCP / IP management unit in association with specific information for specifying a table position. When a search process for searching based on the realization request is executed, and the search in the search process fails, the first session information table is associated with the specific information for specifying the table position in the session information in the realization request. Stored in the TCP / IP management means, the function to the session information function means Along with the transmission of the current request, specific information specifying the table position in the first session information table in the first session information table is transmitted, and the session information function means transmits the specific information specifying the transmitted table position to the session information. Is stored in the second session information table in association with the session information, and identification information for specifying the table position in the second session information table associated with the session information is transmitted to the TCP / IP management means in response to the function realization request. A response is transmitted together with the response, and the TCP / IP management means stores the transmitted specific information for specifying the table position in the second session information table in association with the session information in the first session information table. If the search is successful, the session information Is transmitted from the TCP / IP management means to the session information function means, and the session information function means causes the session information function means to transmit the second information based on the transmitted specific information specifying the table position. A predetermined function is realized by referring to the information table.
[0023]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, a session information management apparatus, system, method, and program according to the present invention will be described in detail with reference to the drawings.
First, an embodiment will be described in which the session information management system according to the present invention is applied to an IP address conversion system and the session information management device is applied to a proxy server, thereby suitably realizing high-speed IP address conversion (IP masquerade). I do.
[0024]
As shown in FIG. 1, the IP address conversion system according to the embodiment of the present invention includes a client 2, an external network 3, and a proxy server (session information management device) that relays the connection of the client 2 to the external network 3. 1 and a server 4 that stores contents.
When the client 2 accesses the content stored in the server 4 via the external network 3, the proxy server 1 converts the local address of the client 2 into a global address, and sends the global address to the server 4. Access by
[0025]
The proxy server 1 performs a proxy operation unit 11 for relaying a connection of the client 2 to the external network 3, a TCP / IP process (TCP / IP management means) 12 for managing TCP and UDP sessions, and an IP address conversion. And an IP address conversion process (session information function means) 13 for performing
[0026]
The TCP / IP process 12 includes a session information table (first session information table) 121 for storing a table number (specific information for specifying a table position) in association with session information, and assigns a table number in the session information table 121 to an address. A request transmitting unit 122 that transmits the request to the IP address conversion process 13 together with the conversion request and the table creation request.
The session information includes, for example, an incoming and outgoing IP address, an outgoing and incoming port number, and the like. The table number stored in the session information table 121 in association with the session information includes a table number in the session information table 121 for one session information, and a session information sub-table 131 for the one session information. And the table number used in.
[0027]
The IP address conversion process 13 includes a session information sub-table (second session information table) 131 for storing a table number (specific information for specifying a table position) in association with session information, and a table number in the session information sub-table 131. And a response transmitting unit 132 that transmits the response to the address translation request and the table creation request from the TCP / IP process 12 to the TCP / IP process 12.
The session information includes, for example, an incoming and outgoing IP address, an outgoing and incoming port number, and the like. The table number stored in the session information sub-table 131 in association with the session information includes a table number in the session information sub-table 131 for one session information, and a table number in the session information sub-table 131 for the one session information. And the table number used in the table 121.
[0028]
The IP address conversion system according to the embodiment of the present invention is configured as described above, so that the session information table 121 and the session information sub-table 131 store their own session information with respect to each stored session information. The table number in the table and the table number associated with the session information in the other table are stored in association with the session information, and the table numbers in both tables are updated in cooperation.
[0029]
Next, the operation of the IP address conversion system according to the present embodiment will be described with reference to the flowcharts of FIGS.
First, the operation of the client 2 and the proxy server 1 when the client 2 transmits a synchronization signal packet (SYN (Synchronous) packet) for establishing a connection in the IP address conversion system according to the present embodiment will be described. This will be described with reference to FIG.
[0030]
When the TCP / IP process 12 receives the SYN packet from the client 2, based on the outgoing / incoming IP address and the outgoing / incoming port number, the session information stored in the already stored session information table 121 is searched. Recognize as a new session.
After creating the session information table 121 for the received SYN packet, the TCP / IP process 12 requests the IP address translation process 13 to create a table, but takes over the table number created by itself as a parameter. That is, when transmitting a request for IP address conversion and table creation (management of session information) to the IP address conversion process 13, the request transmitting unit 122 The number (table position) is transmitted simultaneously as a parameter.
[0031]
Upon receiving a table creation request from the TCP / IP process 12, the IP address conversion process 13 creates a new table, and creates a table number in the session information table 121 of the TCP / IP process 12 which was taken over by a parameter at the time of the table creation request. It is stored in the obtained session information sub-table 131.
After the conversion of the IP address, the response transmission unit 132 of the IP address conversion process 13 returns a table creation response to the TCP / IP process 12, and at this time, takes over the table number created by itself as a parameter. That is, when transmitting a table creation response to the TCP / IP process 12, the response transmission unit 132 simultaneously transmits the table number (table position) created in the session information sub-table 131 of the IP address conversion process 13 as a parameter. I do.
[0032]
The TCP / IP process 12 that has received the table creation response stores the table number in the session information sub-table 131 of the IP address conversion process 13 that was inherited by the parameter in the session information table 121 created by itself.
Since the conversion of the IP address of the SYN packet received from the client 2 has already been completed, the TCP / IP process 12 transmits the SYN packet to the proxy operation unit 11.
[0033]
Next, in the IP address conversion system according to the present embodiment, after the connection is established by the above-described operation, the client 2 transmits the DATA packet for transmitting the data body to the proxy server 1 when the client 2 transmits the DATA packet. The operation between the server and the proxy server 1 will be described with reference to FIG.
[0034]
When the TCP / IP process 12 receives the DATA packet from the client 2 and searches the session information stored in the session information table 121 based on the incoming / outgoing IP address and the incoming / outgoing port number, the same combination (session Information) should be found. That is, as long as there is no abnormality, the session information stored in the session information table 121 by the series of operations shown in FIG. 2 when the above-mentioned SYN packet is received by the proxy server 1 is searched by this search.
[0035]
The table number corresponding to the received session information in the session information sub-table 131 of the IP address conversion process 13 should be stored in the table position of the session information table 121 where the corresponding session information is stored. The unit 122 transmits an address conversion request to the IP address conversion process 13 using the table number in the session information sub-table 131 as a parameter.
[0036]
In the IP address conversion process 13 that receives the address conversion request, the IP address conversion process 13 refers to the session information in the session information sub-table 131 based on the table number in the session information sub-table 131 inherited as a parameter, and performs the address conversion. That is, the table position in the session information sub-table 131 is confirmed and the address conversion is performed without having to search the session information sub-table 131 using the session information.
[0037]
After the address conversion, the response transmitting unit 132 transmits an address conversion response to the TCP / IP process 12.
The TCP / IP process 12 that has received the address translation response transmits a DATA packet to the proxy operation unit 11.
[0038]
Next, in the above-described IP address translation system according to the present embodiment, a specific example of the exchange of information at the time of address translation and each table will be described with reference to FIG. It will be described with reference to FIG.
[0039]
When the SYN packet is transmitted from the client 2, the TCP / IP process 12 associates the session information such as the incoming / outgoing IP address and the incoming / outgoing port number with the table number, and stores the session information table 121 as described above. Create a new one.
After creating the session information table 121, the TCP / IP process 12 requests the IP address conversion process 13 to create a table as described above. At this time, the request transmission unit 122 sends the created table number “1”. "To the IP address conversion process 13 as a parameter.
[0040]
In addition, the IP address conversion process 13 associates session information such as an incoming / outgoing IP address, an incoming / outgoing port number, a converted IP address, and a converted port number with a table number, and newly creates a session information sub-table 131 as described above. .
After the conversion of the IP address, the response transmission unit 132 of the IP address conversion process 13 returns a table creation response to the TCP / IP process 12, and the table number “2” created at that time is used as a parameter for the TCP / IP process. Notify the IP process 12.
[0041]
As described above, the session information table 121 stores the table number “1” in association with the session information and the table number of the session information sub-table 131 corresponding to the session information.
Further, the session information sub-table 131 stores the table number “2” in association with the session information and the table number of the session information table 121 corresponding to the session information.
[0042]
As described above, according to the IP address conversion system according to the present embodiment, the TCP / IP process 12 and the IP address conversion process 13 operate in cooperation with each other, so that session management can be made more efficient. Address translation (IP masquerade) can be speeded up.
In other words, the session information is not searched (two times) in both the TCP / IP process and the IP address conversion process, and only one search is required, so that the IP address conversion can be speeded up accordingly.
[0043]
Although the session information management system according to the present invention is applied to the IP address conversion system and the session information management device is applied to the proxy server, the scope of the present invention is not limited to this.
That is, in the above-described embodiment, the session information managed by the TCP / IP process 12 is shared by the IP address conversion process 13 by storing the table number in the other table, and the IP address conversion process is performed. Has been described.
The present invention is not limited to this embodiment. For example, even in traffic collection performed on a session basis, TCP / IP management means (such as a TCP / IP process) and traffic collection means for performing traffic collection (session information function means) A method of sharing session information, such as a method of storing a table number in the other table described above, is used to efficiently manage the session information and speed up the realization of a predetermined function. It becomes possible.
Also in the case where the present invention is applied to the traffic collection described above, the same table structure as that shown in the above-described embodiment can be applied.
[0044]
【The invention's effect】
As described above, in the session information management device according to the present invention, the first session information table in the TCP / IP management unit and the second session information table in the session information function unit are tables for one session information. The specific information for specifying the position is shared with each other.
As a result, session management in the TCP / IP management unit and the session information function unit can be made more efficient. Therefore, it is possible to speed up the realization of the predetermined function by the session information function means. Therefore, even when the number of sessions is large, a high-speed operation can be performed.
[0045]
Further, the same effects as those of the above-described session information management device according to the present invention can also be obtained by the respective session information management systems, session information management methods, and session information management programs of the present invention.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an outline of a configuration of an IP address conversion system as an embodiment of the present invention.
FIG. 2 is a sequence chart showing the operations of the client and the proxy server 1 when the IP address translation system translates a SYN packet.
FIG. 3 is a sequence chart showing an operation of the client and the proxy server 1 when the IP address translation system translates a DATA packet.
FIG. 4 is a diagram for explaining a specific example of exchange of information and each table when performing address translation of a SYN packet in the IP address translation system.
FIG. 5 is a block diagram showing an outline of a configuration of a conventional IP address conversion system.
FIG. 6 is a sequence chart showing an operation of the client and the proxy server 9 when performing the address conversion of the SYN packet in the IP address conversion system.
FIG. 7 is a sequence chart showing an operation in the client and the proxy server 9 when the address conversion of the DATA packet is performed in the IP address conversion system.
FIG. 8 is a diagram for explaining a specific example of exchange of information and each table when performing address conversion of a SYN packet in the IP address conversion system.
[Explanation of symbols]
1 proxy server (session information management device)
11 Proxy operation unit
12 TCP / IP process (TCP / IP management means)
121 session information table (first session information table)
122 request transmission unit
13 IP address conversion process (session information function means)
131 session information sub-table (second session information table)
132 Response sending unit
2 Client
3 external network
4 server

Claims (10)

A session information management apparatus comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and realizes a predetermined function.
The TCP / IP management means includes:
A first session information table for storing identification information for identifying a table position in association with session information;
A request transmitting unit that transmits specific information for specifying the table position to the session information function unit together with the request for realizing the predetermined function,
The session information function means,
A second session information table for storing specific information for specifying the table position in association with the session information;
A response transmitting unit that transmits specific information for specifying the table position to the TCP / IP management unit together with a response to the realization request,
The first session information table and the second session information table share identification information for identifying a table position of one session information with each other. A session information management apparatus comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and realizes a predetermined function.
The TCP / IP management means includes:
A first session information table for storing identification information for identifying a table position in association with session information;
A request transmitting unit that transmits specific information for specifying the table position to the session information function unit together with the request for realizing the predetermined function,
The session information function means,
A second session information table for storing specific information for specifying the table position in association with the session information;
A response transmitting unit that transmits specific information for specifying the table position to the TCP / IP management unit together with a response to the realization request,
The TCP / IP management means includes:
Identifying information for identifying a table position in the second session information table for one session information transmitted from the session information function means is stored in association with the one session information in the first session information table. And
The session information function means,
The identification information specifying the table position in the first session information table for the one session information transmitted from the TCP / IP management means is associated with the one session information in the second session information table. A session information management device characterized by storing. When the request for realizing the predetermined function is input, the TCP / IP management means searches the first session information table based on the request for realization,
If the search fails, store the session information as new in the first session information table;
When the search is successful, the identification information for identifying the table position associated with the searched session information is transmitted to the session information function means, and the session information function means identifies the transmitted table position. 3. The session information management device according to claim 1, wherein the predetermined function is realized using specific information to be performed. The predetermined function is an IP address conversion function,
4. The session information management device according to claim 1, wherein the request for realizing the predetermined function is an IP address conversion request. A session information management system comprising: the session information management device according to any one of claims 1 to 4; and a client connected to the session information management device.
The session information management system, wherein the predetermined function is realized by a request from the client. A session information management system comprising: the session information management device according to claim 4; and a client connected to the session information management device,
A session information management system, wherein the session information management device converts a local address transmitted from the client to an IP address. A session information management method in a session information management apparatus, comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and implements a predetermined function.
Upon receiving the request for realizing the predetermined function, a search for searching the first session information table for storing the session information in the TCP / IP management means in association with the specific information for specifying the table position based on the realization request Process,
If the search in the search step has failed, the first session information table and the second session information table in the session information functioning unit may include identification information for identifying a table position in the session information in the realization request. Are stored in association with each other, and specific information for specifying a table position in the other table is stored with each other,
When the search in the search step is successful, the session information function unit refers to the second session information table based on specific information that specifies a table position associated with the searched session information, A session information management method, wherein the predetermined function is realized. A session information management method in a session information management apparatus, comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and implements a predetermined function.
Upon receiving the request for realizing the predetermined function, a search for searching the first session information table for storing the session information in the TCP / IP management means in association with the specific information for specifying the table position based on the realization request Process,
If the search in the search step has failed, the first session information table stores the session information in the realization request in association with the specific information for specifying the table position,
The TCP / IP management means transmits a function realization request to the session information function means, and transmits specific information for specifying a table position in the session information in the first session information table;
The session information function means stores identification information for identifying the transmitted table position in a second session information table in association with the session information, and stores the identification information in the second session information table in association with the session information. Transmitting identification information for identifying a table position to the TCP / IP management means together with a response to the function realization request;
The TCP / IP management unit stores the transmitted identification information for identifying a table position in the second session information table in association with the session information in the first session information table,
When the search in the search step is successful, specific information for specifying a table position associated with the searched session information is transmitted to the session information function means, and the session information function means A session information management method, wherein the predetermined function is realized by referring to the second session information table based on specific information for specifying the table position. A session information management program for a session information management apparatus, comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and implements a predetermined function.
In the session information management device,
Upon receiving the request for realizing the predetermined function, a search for searching the first session information table for storing the session information in the TCP / IP management means in association with the specific information for specifying the table position based on the realization request Execute the process,
When the search in the search process fails, the first session information table and the second session information table in the session information function unit include, in the session information in the realization request, specific information for specifying a table position. Are stored in association with each other, and specific information for specifying a table position in the other table is stored with each other,
When the search in the search process is successful, the session information function unit refers to the second session information table based on the specific information specifying the table position associated with the searched session information, A session information management program for realizing the predetermined function. A session information management program for a session information management apparatus, comprising: a TCP / IP management unit that manages a TCP session; and a session information function unit that manages session information and implements a predetermined function.
In the session information management device,
Upon receiving the request for realizing the predetermined function, a search for searching the first session information table for storing the session information in the TCP / IP management means in association with the specific information for specifying the table position based on the realization request Execute the process,
If the search in the search process fails, the first session information table stores the session information in the realization request in association with the specific information specifying the table position,
Causing the TCP / IP management means to transmit a function realization request to the session information function means and to transmit specific information for specifying a table position in the session information in the first session information table;
Causing the session information function means to store identification information for identifying the transmitted table position in a second session information table in association with the session information, and in the second session information table associated with the session information; Causing the TCP / IP management means to transmit specific information for specifying a table position together with a response to the function realization request;
Causing the TCP / IP management means to store the transmitted identification information for identifying the table position in the second session information table in association with the session information in the first session information table;
When the search in the search process is successful, the TCP / IP management unit transmits to the session information function unit specific information for specifying a table position associated with the searched session information, A session information management program for causing a function unit to refer to the second session information table based on the transmitted identification information for identifying the table position, and to realize the predetermined function.

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