CN1540942A - Method for converting data message in two way - Google Patents
Method for converting data message in two way Download PDFInfo
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- CN1540942A CN1540942A CNA031220134A CN03122013A CN1540942A CN 1540942 A CN1540942 A CN 1540942A CN A031220134 A CNA031220134 A CN A031220134A CN 03122013 A CN03122013 A CN 03122013A CN 1540942 A CN1540942 A CN 1540942A
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Abstract
The method includes steps: first creating a storage structure for storing conversion information of data message; converting each data message in positive direction, searching the said storage structure to look up whether there is a converted information corresponding to the data message; if yes, conversion is carried out by using the conversion information; if no, creating the conversion information of data message, and storing it in the storage structure; when converting the data message in negative direction, conversion is carried out by using corresponding conversion information stored in storage structure. The method saves memory space and avoids additional operation for memory so as to raise conversion efficiency.
Description
Technical field
The present invention relates to the bi-directional conversion method of the conversion method of data message in the data communication system, particularly data message.
Background technology
In data communication system, there is the lot of data message need carry out bi-directional conversion.For example in the equipment that network address translation apparatus (NAT), Web current load balancing equipment, dynamic firewall etc. need be changed the data message, conversion to the data message in the data communication process is normally two-way, promptly the data message of a direction is changed according to specific transitional information, and reciprocal data message also reduces the conversion of mode according to described specific transitional information, finishes the bi-directional conversion task of data message with this.For its transitional information of different data messages also is different, and for example, in the data message transfer process, transitional information can be the mapping relations of IP address before and after the conversion and/or the mapping relations of conversion front and back TCP/UDP port numbers.Therefore, need carry out record, with the forward conversion and the reduction conversion of data message in the other direction of the data message that is used for follow-up same characteristic features for the transitional information of each different data message.
When some communication equipments that are used for data message conversion carry out two-way data message conversion in the data communication system, positive and negative two-way conversion for same data message, its positive direction needs identical transitional information with reciprocal conversion, and for both direction, the feature of the data message that index translation information is used is different.With reference to Fig. 1, the transitional information of data message is kept in the leaf node of tree form data structure.The data message that is X with a pattern is converted to the data message that pattern is Y, be to be that feature in the data message of X comes index to deposit a tree form data structure of transitional information by the extraction pattern, index corresponding transitional information, finishing pattern according to this transitional information is that the data message of X is converted to the forward conversion that pattern is the data message of Y; And corresponding reverse conversion is to be that feature in the data message of Y comes index to deposit another tree form data structure of same transitional information by the extraction pattern, index corresponding transitional information, finishing pattern according to this transitional information is that the data message of Y is converted to the reverse conversion that pattern is the data message of X.Thereby different data messages includes the data message that different IP addresses and/or TCP/UDP port numbers have constituted different mode.The above-mentioned indexed mode that is used for the transitional information of data message bi-directional conversion is to adopt that to set up respectively with the pattern be that the feature of data message of X is carried out index and is that the mode that the feature of the data message of Y is carried out two tree form data structures of index realizes with the pattern.
In the bi-directional conversion process of above-mentioned data message, to distinguish two tree form data structures of index stores same transitions information according to the different conversion direction of same data message.And the feature difference of the data message that positive and negative two-way index uses, therefore two tree form data structures are actually incoherent, and system will safeguard two tree form data structures simultaneously for this reason, has so just increased extra maintenance work.Simultaneously for the positive and negative bi-directional conversion of same data message, the transitional information of the leaf node place storage of two tree form data structures is identical, the transitional information that is each forward is repeated again to have write down once in the tree form data structure of reverse conversion, therefore also can cause the significant wastage of memory headroom.
In order to solve the problem that above-mentioned transitional information is repeated to write down, only the leaf node place in the tree form data structure of conversion forward or backwards writes down some pointers, with reference to figure 2, it is the situation of the leaf node place record pointer in the tree form data structure of reverse conversion, the corresponding leaf node of the tree form data structure of this pointed forward conversion, store corresponding transitional information in this correspondence leaf node, like this when data message carries out reverse conversion, can according to the feature of this data message in reverse tree form data structure index corresponding to the pointer of this data message, corresponding to the transitional information of this data message, carry out reverse data message conversion according to this transitional information according to index in the tree form data structure that is directed to forward conversion of pointer then.Said method can solve to a certain extent because the memory source waste problem that the duplicate record transitional information is caused, yet remove transitional information in the index forward tree form data structure according to the sensing of pointer in the reverse tree form data structure, can increase, promptly cause once extra internal memory read operation once to the operation of internal memory.
In data communication system, the equipment that is used for data message conversion is the Internet backbone and nucleus equipment particularly, and the usage space of its internal memory is very valuable; In the transfer process of the data message that carries out big flow, it directly has influence on the throughput of equipment to the read or write speed of internal memory simultaneously.
In sum, find a kind of can save memory take up room and can reduce method to the data message bi-directional conversion of the number of operations of internal memory just seem and be even more important.
Summary of the invention
The object of the present invention is to provide the bi-directional conversion method of the higher data message of a kind of conversion efficiency, use this method can the employed memory headroom of conserve memory transitional information, also can reduce number of operations internal memory.
In order to realize above-mentioned purpose, the concrete scheme of proposition is as follows:
Set up a storage organization that is used to store the data message transitional information;
When each data message was carried out forward conversion, at first whether index had and the corresponding transitional information of this data message in described storage organization, if having, utilized this transitional information to change; If no, the transitional information of creating this data message stores in the described storage organization, and changes according to the transitional information of creating;
When this data message is carried out reverse conversion, utilize the corresponding transitional information of storing in the described storage organization to change.
Wherein said transitional information comprises the protocol port number after IP address before the data message conversion and the protocol port before IP address after the conversion and/or the data message conversion number and the conversion, stores the position of transitional information in IP address after the described data message conversion and/or the protocol port after the conversion number and the described storage organization and satisfies corresponding relation.When described data message reverse conversion, according to the protocol port after IP address after the data message conversion and/or the conversion number, by described corresponding relation, obtain the position of storage transitional information in the described storage organization, the transitional information that reads in this position is changed.
After adopting the bi-directional conversion method of data message of the present invention, transitional information has only been stored once at memory headroom, saved shared memory headroom, also reduced simultaneously the maintenance workload of system, by the position of storage transitional information in the storage organization and the corresponding relation of the feature of conversion back data message, can quick indexing during the data message reverse conversion carry out the reverse conversion of data message to corresponding transitional information, thereby avoided extra operation, improved the conversion speed of data message internal memory.
Description of drawings
Fig. 1 is the bi-directional conversion method schematic diagram of the data message of two tree form data structure storages of existing employing transitional information;
Fig. 2 is the bi-directional conversion method schematic diagram that two tree form data structures of existing employing pointer form are stored the data message of transitional informations;
Fig. 3 is the schematic network structure of application network address transition principle;
Fig. 4 is the bi-directional conversion process schematic diagram that NAT device carries out data message;
Fig. 5 is the embodiment flow chart of the method for the invention;
Fig. 6 is the storage scheme of the transitional information of the described embodiment employing of Fig. 5;
Fig. 7 is the corresponding relation figure of the memory location of leaf node and transitional information in Fig. 6 scheme;
Fig. 8 is the bivariate table structure that the feature of having stored the memory address of storage organization of transitional information and conversion back data message satisfies corresponding relation.
Embodiment
Be example to adopt network address translation device that the TCP/UDP data message is carried out bi-directional conversion below, in conjunction with the accompanying drawings the solution of the present invention be described in further detail.
For whole the Internet, legal or publicly-owned IP address resource is very limited, simultaneously, is connecting a large amount of local area network (LAN)s on whole the Internet, if the network node of local area network (LAN) inside also takies legal IP address, then more can increase the weight of the in short supply of legitimate ip address.Therefore,, solve the legitimate ip address problem of shortage in order to make full use of legal IP address, usually, at inner each main frame that adopts on the private IP address marked network node of a local area network (LAN).Like this in the communication process between local area network (LAN) inside and external the Internet, for example local area network (LAN) inside is in the process that external the Internet sends datagram, usually utilize the NAT method, the method that is network address translation is converted to the private IP address of local area network (LAN) inside the outside forwarding of carrying out data message after the legal IP address again, on the contrary, for one from the outside, promptly enter the data message of local area network (LAN) from the Internet, also to utilize the NAT method that legal IP address is converted to corresponding private IP address, carry out the reverse transmission of data message again.The NAT method is used in router, Web stream equalizer and the dynamic firewall of data communication system usually now, finishes the bi-directional conversion of private IP address and legitimate ip address, and gives safety assurance to the local area network (LAN) internal network structure.
The network configuration that adopts above-mentioned principle is with reference to figure 3, and the place will be provided with network address translation device at the local network accessing Internet, the data message conversion between NAT device processing all-network is inside and outside.NAT device has Intranet port and outer net port, the corresponding privately owned IP address of the port of Intranet wherein, the corresponding legal IP address of outer net port.When 1 host A (its private IP address is that the IP address before the data message conversion is 192.168.0.1) of local area network (LAN) inside is wanted the server X (the IP address of server X is 202.112.7.12) on the access internet, setting the inner TCP/UDP port numbers of distributing for host A of local area network (LAN) is 1024, the TCP/UDP port numbers of server X is that slogan is 21, this moment, host A was with data message (192.168.0.1:1024,202.112.7.12:21) be sent to NAT device, after NAT device receives this data message, NAT device can dynamically distribute 1 not privately owned TCP/UDP port numbers 1024 of the legal TCP/UDP port numbers 10001 former data messages of replacement of usefulness, and distribute a legal IP address 100.0.0.2 to replace the privately owned IP address 192.168.0.1 of former data message, data message after the NAT device conversion is (100.0.0.2:10001 like this, 202.112.7.12:21), the verification of calculated data message is sent to the Internet then.Can see the information that does not contain any privately owned address in this data message thus.NAT device carry out the data message conversion time write down this to mapping: 192.168.0.1:1024＜-100.0.0.2:10001, and this is saved in the storage organization mapping.Later on when NAT device receives this to any one data message between main frame, NAT device can inquire about whether recorded this transitional information in the storage organization, be above-mentioned mapping relations, if have, again according to this transitional information, be that mapping relations make it smoothly by the forward conversion of NAT device, vice versa.
Above-mentioned private IP address is the IP address before the data message conversion, legitimate ip address is the IP address after the data message conversion, privately owned TCP/UDP port numbers is the TCP/UDP port numbers before the data message conversion, legal TCP/UDP port numbers is the TCP/UDP port numbers after the data message conversion, and is as follows.
The bi-directional conversion process of above-mentioned data message is with reference to figure 4, zone 1 is the data message conversion of local area network (LAN) inside among the figure, comprising being private IP address 192.168.0.1, privately owned TCP/UDP port numbers is that data message that 1024 host A sends converts to legal IP address 100.0.0.2 by NAT device and represents, the TCP/UDP port numbers is 10001 data message, sends between the Internet then.Among Fig. 4, the data message that host A in the local area network (LAN) sends comprises the IP address 192.168.0.1 before the conversion, TCP/UDP port numbers 1024 and purpose IP address 202.112.7.12 before the conversion, purpose TCP/UDP port numbers 21, the NAT device of the local area network (LAN) inside through regional 1 carries out forward conversion to above-mentioned data message, data message after the conversion comprises the IP address 100.0.0.2 after the conversion, TCP/UDP port numbers 10001 after the conversion and purpose IP address 202.112.7.12, purpose TCP/UDP port numbers 21, this process is the forward conversion of data message; In zone 2, the data message after changing is routed to the server X of purpose IP address 202.112.7.12 then by router.
With regard to rightabout, the return course of data message is also as Fig. 4 hereto, between the Internet of zone in 2, be the IP address NAT device that the data message of 202.112.7.12 is routed to IP address 100.0.0.2 at first, NAT device receives the corresponding transitional information that this data message is then wanted original record in the index stores structure, in zone 1, carry out the reverse data message conversion of local area network (LAN) inside according to transitional information, promptly above-mentioned legal IP address 100.0.0.2 is converted to privately owned IP address 192.168.0.1, above-mentioned legal TCP/UDP port numbers 10001 is converted to privately owned TCP/UDP port numbers 1024, all the time comprise purpose IP address 202.112.7.12 and purpose TCP/UDP port numbers 21 in this process in the data message, this process is exactly the reverse conversion of data message.
Based on top described, in the specific embodiment of the present invention, at first to set up the storage organization that is used to store the data message transitional information, can be the bivariate table structure in the described storage organization reality, also can adopt tree structured index, described transitional information be stored in the leaf node of tree structure.As shown in Figure 5, like this, when NAT device when step 11 receives data message, to judge that this data message is forward data message (promptly being sent to the data message of the Internet from local area network (LAN)) or reverse data message (promptly being sent to the data message of local area network (LAN) from the Internet) in step 12, if forward data message, then in step 13 index stores structure, whether store and the corresponding transitional information of this data message, judge in step 15 whether this transitional information exists then, if exist, then utilize described transitional information to carry out the forward conversion of data message in step 17; If judge that through step 15 described transitional information does not exist, then to generate transitional information and store storage organization in the feature of step 16 according to the data message that receives, carry out the forward conversion of this data message then according to the transitional information that generates; If it is the reverse data message that step 12 is judged the data message that receives, then at the direct corresponding transitional information of index in storage organization of step 14, judge in step 18 whether this transitional information exists, if there is no forward step 21 to and do and abandon this data message and handle; If exist execution in step 19 to judge whether the transitional information that indexes is effective, if effectively execution in step 20 utilizes the transitional information that indexes to carry out the reverse conversion of data message, if invalid then execution in step 21 is done and abandoned this data message and handle.Transitional information described in this example comprises IP address and TCP/UDP port numbers before IP address after the conversion and the data message conversion and the TCP/UDP port numbers after the conversion before the data message conversion, also comprises the rise time of transitional information, the time of renewal, accessed number of times, service marking etc.Certainly, in other specific embodiment, task of the present invention also can be finished in IP address after described transitional information only comprises the preceding IP address of data message conversion and changes, equally, comprise that the rise time of transitional information, the time of renewal, accessed number of times, service marking etc. also can help enforcement of the present invention more.
For the speed that makes index translation information faster, present embodiment adopts the method for the leaf node of continuous dispensing storage transitional information to memory space, be about to these memory headrooms and address according to the shared space of each leaf node, the principle of said method is with reference to figure 6 and Fig. 7.Like this, when generating transitional information and storing this transitional information, at first need the leaf node address of a free time to deposit this transitional information.After having obtained idle leaf node, address according to this leaf node, the corresponding relation of the IP address after address by leaf node and the data message conversion is (when comprising protocol port, number there are corresponding relation in leaf node address and IP address+protocol port) obtain the IP address after the conversion, and leave in the leaf node, be used for follow-up conversion.When receiving reciprocal data message, only according to the IP address in this data message and protocol port number, by the IP address after the data message conversion and/or protocol port number linear corresponding relation with the leaf node address, both can directly calculate the leaf node address, and read transitional information in this address and carry out reverse conversion and get final product.For preventing to read the leaf node that does not write down transitional information, distinguish leaf node that has write down transitional information and the leaf node that does not write down transitional information by " effectively " sign of record in leaf node.The means that the transitional information that writes down in IP address after further checking can be changed by the use data message and the leaf node compare are carried out.In Fig. 6 and exemplary plot shown in Figure 7, adopt IP address 0 to IP address n to represent corresponding transitional information, employing side-play amount 0 to n is represented the address of leaf node.
How to make many transitional informations and its position of in storage organization, storing satisfy corresponding relation below with reference to Fig. 8 explanation.Suppose to have the contiguous memory space that to deposit 200 transitional informations, be 20 the contiguous memory spaces of IP address assignment after each conversion, the conversion of the TCP/UDP port numbers of the IP address after each conversion after can corresponding 20 different conversions like this, suppose that TCP/UDP port numbers after the conversion since 10000, is 10000～10019 for the TCP/UDP port numbers after the spendable conversion in IP address after the conversion like this.
Its memory address can be the memory address side-play amount, also can be the subscript of array, and present example is represented different memory headrooms with the memory address side-play amount.Suppose the memory address of depositing transitional information since 8000, with reference to Fig. 8, side-play amount is the IP address after 0 memory address is deposited conversion: the TCP/UDP port numbers after the conversion is to being 100.0.0.1:10000; Side-play amount is the IP address after 1 memory address is deposited conversion: the TCP/UDP port numbers after the conversion is to being 100.0.0.1:10001, and the rest may be inferred like this goes down.
According to the IP address of above-mentioned rule after different conversions: the TCP/UDP port numbers after the conversion is to depositing in different memory addresss, TCP/UDP port numbers and memory address after IP address after the conversion and the conversion meets following corresponding relation like this: addr (IP, Port)=(IP-100.0.0.0.1) * 20+ (Port-10000)+8000, addr represents memory address in the formula, IP address after IP represents to change, the TCP/UDP port numbers after Port represents to change.This relational expression is exactly the IP address after said memory address and the data message conversion, the corresponding relation of the TCP/UDP port numbers after the conversion.
When a data message of local area network (LAN) inside when transmit the outside, it is the forward conversion of data message, the IP address is 192.168.0.1 before the conversion specifically, TCP/UDP port numbers before the conversion is that 1024 data message is when carrying out forward conversion, the current transitional information of storing in the index stores structure at first, if indexing corresponding transitional information (is that memory address is 8021, transitional information be 192.168.0.1:1024＜-100.0.0.2:10001), then carry out forward conversion according to this transitional information, being IP address before the data message conversion that 192.168.0.1 is converted to the legitimate ip address that the IP address is 100.0.0.2 promptly, is the preceding TCP/UDP port numbers of conversion that 1024 to be converted to the TCP/UDP port numbers be 10001 legal protocol port number; If do not index this transitional information, then need to store according to transitional information of feature-modeling of this data message, utilize this transitional information of creating to carry out forward conversion simultaneously.
Next at first store for depositing this transitional information at the memory address of a memory headroom free time of searching, as memory address is that 8021 memory headroom is idle, so just in this memory address, add this new transitional information, IP address before promptly changing: the TCP/UDP port numbers before the conversion is to being 192.168.0.1:1024, IP address after the conversion: the TCP/UDP port numbers after the conversion is to being 100.0.0.2:10001, make 192.168.0.1:1024 corresponding with 100.0.0.2:10001, and make the IP address after the conversion: the TCP/UDP port numbers after the conversion is to meeting certain corresponding relation for 100.0.0.2:10001 and memory address 8021.
Be " effectively " signs of these memory address 8021 records simultaneously, make this memory address 8021 not used by other transitional information again, and when the data message of follow-up same characteristic features is changed, when this transitional information is carried out index, can know that this memory address 8021 is effective.
When carrying out the reverse conversion of above-mentioned data message, promptly the IP address after the data message conversion: the TCP/UDP port numbers after the conversion is the IP address before 100.0.0.2:10001 is converted to conversion: the TCP/UDP port numbers before the conversion is 192.168.0.1:1024, at first according to the IP address after the conversion: the TCP/UDP port numbers after the conversion is to 100.0.0.2:10001, according to the IP address after aforementioned memory address and the conversion, the corresponding relation of the TCP/UDP port numbers after the conversion is expressed formula: add (IP, Port)=(IP-100.0.0.0.1) * 20+ (Port-10000)+8000, numerical value 100.0.0.2:10001 is brought into following formula to be obtained: (100.0.0.2-100.0.0.1) * 20+ (10001-10000)+8000=8021, so just obtained depositing the memory address 8021 of its transitional information, directly read the transitional information of memory address 8021 stored, carry out reverse conversion with regard to the corresponding IP address that has obtained before the conversion according to this transitional information: the TCP/UDP port numbers before the conversion is delivered to the main frame that the IP address is 192.168.0.1 to the data message after changing to 192.168.0.1:1024.
The above-mentioned transitional information of storing can also be deleted as the case may be, and wherein Shan Chu mode has:
(1) keeper is manual deletes;
(2) transitional information (as half an hour) in set a period of time is then deleted this transitional information not by any data message index mistake;
(3) transitional information is then deleted this transitional information by FIN (finish finishes) message or RST (reset resets) the message index mistake of TCP message.
The invention is not restricted to above execution mode, so long as the embodiment of design philosophy according to the invention is all in the scope that the present invention protected.
Claims (10)
1, a kind of bi-directional conversion method of data message, concrete steps are as follows:
Set up a storage organization that is used to store the data message transitional information;
When each data message was carried out forward conversion, at first whether index had and the corresponding transitional information of this data message in described storage organization, if having, utilized this transitional information to change; If no, the transitional information of creating this data message stores in the described storage organization, and changes according to the transitional information of creating;
When this data message is carried out reverse conversion, utilize the corresponding transitional information of storing in the described storage organization to change.
2, the bi-directional conversion method of data message according to claim 1 is characterized in that: the IP address after described transitional information comprises the preceding IP address of data message conversion and changes.
3, the bi-directional conversion method of data message according to claim 2 is characterized in that: described transitional information also comprises protocol port number before the data message conversion and the protocol port after the conversion number.
4, the bi-directional conversion method of data message according to claim 3 is characterized in that: the memory address of storing transitional information in IP address after the conversion of described data message and/or the protocol port after the conversion number and the described storage organization meets corresponding relation.
5, the bi-directional conversion method of data message according to claim 4, it is characterized in that: during described data message reverse conversion, according to the protocol port after IP address after the data message conversion and/or the conversion number, by described corresponding relation, obtain the memory address of storage transitional information in the described storage organization, the transitional information that reads in this memory address is changed.
6, the bi-directional conversion method of data message according to claim 1 is characterized in that: described transitional information continuous dispensing is stored in the memory space of described storage organization.
7, according to the bi-directional conversion method of claim 1,4,5 or 6 described data messages, it is characterized in that: described storage organization is bivariate table structure or tree structure.
8, the bi-directional conversion method of data message according to claim 7 is characterized in that: described transitional information is stored in the leaf node of described tree structure.
9, the bi-directional conversion method of data message according to claim 8 is characterized in that: distinguish whether write down transitional information in the leaf node by " effectively " sign of record in leaf node.
10, the bi-directional conversion method of data message according to claim 1, it is characterized in that: described transitional information in a period of time that is provided with, do not crossed by any data message index or described transitional information by the FIN message of TCP message or RST message index mistake, then delete this transitional information.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102710494A (en) * | 2012-04-23 | 2012-10-03 | 中兴通讯股份有限公司 | Method and device for processing messages in remote authentication dial-in user service system |
| TWI466501B (en) * | 2011-02-22 | 2014-12-21 | Realtek Semiconductor Corp | Method and network device for packet content translation |
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| US6331984B1 (en) * | 1998-08-21 | 2001-12-18 | Nortel Networks Limited | Method for synchronizing network address translator (NAT) tables using the server cache synchronization protocol |
| CN1161932C (en) * | 2001-06-20 | 2004-08-11 | 英业达集团（南京）电子技术有限公司 | Network connector for realizing multiple electronic equipment wireless internet communication |
| CN1181655C (en) * | 2002-10-17 | 2004-12-22 | 武汉邮电科学研究院 | Data packet transmission method in mobile IP |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI466501B (en) * | 2011-02-22 | 2014-12-21 | Realtek Semiconductor Corp | Method and network device for packet content translation |
| CN102710494A (en) * | 2012-04-23 | 2012-10-03 | 中兴通讯股份有限公司 | Method and device for processing messages in remote authentication dial-in user service system |
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