CN102868587A - Method and system for converting A10 interface data to backbone virtual private network (VPN) data - Google Patents
Method and system for converting A10 interface data to backbone virtual private network (VPN) data Download PDFInfo
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Abstract
The invention relates to a method and a system for converting A10 interface data to backbone virtual private network (VPN) data. The system comprises a data receiving module, a data package sequencing module, a data analyzing module, a data packaging module and a sending module. The method includes steps of firstly, initializing a hash table containing generic route encapsulation (GRE) nodes before an A10 interface data package is received; secondly, analyzing an original internet protocol (IP) address, a destination IP address and a grekey after the A10 interface data package is received, using the original IP address, the destination IP address and the grekey as key words to query whether corresponding GRE nodes exist in the hash table; thirdly, extracting data package PPP load frames containing the GRE nodes to obtain user business data; fourthly, subjecting the business data to VPN packaging to finish data conversion; and fifthly, checking the sequence number of a package containing cache nodes in a cache chain table of the GRE nodes. According to the method and the system, the backbone business system can process the A10 interface data without any modification.
Description
Technical field
The present invention relates to the conversion of network interface data, particularly the A10 interface data is converted to the method and system of backbone network VPN interface data in a kind of CDMA2000 core net.Belong to the mobile Internet field.
Background technology
This mobile communication fast development in several years, increasing user selection uses the mobile device interconnection network, therefore operator is in the urgent need to understanding rapidly and accurately mobile subscriber's internet behavior characteristics, and the internet behavior analysis by to the mobile subscriber can provide better value-added service.Because the development of the backbone network of the Internet is very ripe, a lot of existing operation systems are based on all that the backbone interface of the Internet realizes, data, the especially data of CDMA 2000 core net that can't the compatible processing mobile core network.
CDMA2000 is one of three large 3G standards, except traditional voice communication, also supports high-speed data service.The CDMA2000 core net can provide to the mobile subscriber public network, the private network access service of public network, private network access service and movement-based IP based on simple IP.The CDMA2000 packet core network of movement-based IP comprises Packet Control Function PCF(Packet ControlFunction), packet data serving node PDSN Packet Data Serving Node) etc., the business datum interface is the A10 interface.
The VPN (virtual private network) VPN(Virtual Private Network of backbone network) simple application of data is directly to encapsulate GRE(Generic Routing Encapsulation outside the network layer of business datum, generic route encapsulation) agreement is by the gre tunneling service data transmission.The A10 interface is the business datum interface of CDMA2000 core net, and the A10 interface adopts the GRE agreement that two layers of ppp protocol are encapsulated, and the PPP peer-peer protocol has encapsulated again the business datum after overcompression.
Summary of the invention
For present backbone network operation system can't compatible processing mobile core network data problem, the objective of the invention is to realize that a kind of A10 interface data of CDMA2000 core net is converted to the method and system of backbone network VPN data.
In order to achieve the above object, the present invention is directed to the problem such as compatibility, flexibility of backbone network operation system, by analyzing the A10 interface data of CDMA 2000 core net, extract business datum, the redesign encapsulation format, the VPN that makes it to become the standard of backbone network uses, and provides a kind of A10 interface data of CDMA 2000 core net to be converted to the method and system of the VPN data of backbone network.
Main technical content of the present invention is: a kind of A10 interface data transforms the method for backbone network VPN data, and its step comprises:
1) receive before the A10 interface data bag, initialization comprises the Hash table of GRE node, and described GRE node keyword comprises: source IP address, purpose IP address and grekey, bag sequence number and buffer memory chained list after handling;
2) receive A10 interface data bag after, parse source IP address, purpose IP address and grekey, and described source IP address, purpose IP address and grekey inquired about in described Hash table as keyword whether have corresponding GRE node to exist;
If 2-1) do not have the GRE node, newly-built GRE node then;
2-2) carry out buffer memory or abandon packet out of order or that retransmit occurring;
2-3) packet of normal in order transmission continued to process;
3) obtain user's business datum by the packet ppp load frames of extracting the described GRE of existence node;
4) described business datum is carried out the VPN encapsulation, finish the conversion of data;
5) the bag sequence number of the cache node in the buffer memory chained list of inspection GRE node is if then process in order the bag of this cache node; If not then continue buffer memory, beginning receives new data again.
It is described that packet out of order or that retransmit carries out buffer memory or the method that abandons is to occurring:
1) add 1 afterwards less than receiving the packet sequence number if handled the sequence number value of packet on the GRE node, illustrate that appearance is out of order, the data pack buffer that then receives is on GRE nodal cache chained list;
2) add 1 afterwards greater than receiving the packet sequence number if handled the sequence number value of packet on the GRE node, illustrate to occur retransmitting, then abandon the packet of current reception;
3) if handled on the GRE node and equal to receive the packet sequence number after the sequence number value of packet adds 1, illustrate that data are normally orderly, continue to process.
In described all data of backbone network VPN, set up two GRE nodes in each user's data; In upstream data, described source IP address is the PCF address, and described purpose IP address is the PSDN address; In downlink data, described source IP address is the PSDN address, and described purpose IP address is the PCF address.
Described step 3) ppp load data frame according to the 0x7e flag byte as the starting and ending sign.
Described PPP information frame obtains user service information through decompressing; The compression algorithm of described PPP information frame is generally MPPC, VJ compression algorithm.
The present invention also proposes the system that a kind of A10 interface data transforms key VPN data, comprise: the sending module of VPN data after being used for receiving data reception module, data packet sequencing module, data resolution module, the data encapsulation module of A10 interface data and being used for sending conversion
Described data packet sequencing module is carried out the ordering of packet according to the packet sequence number that receives; Carry out buffer memory or abandon to the newly-built GRE node of first packet of user's uplink and downlink or to packet out of order or that retransmit occurring, the packet of orderly transmission is continued to process;
Described data resolution module obtains user's business datum for the packet ppp load frames of extracting the described GRE of existence node;
The user service data that described data encapsulation module is used for extracting is encapsulated as the form of the VPN data of backbone network.
Preferably, in the described data encapsulation module, user's business datum is a complete IP bag, and described IP bag is by GRE layer, network layer, link layer packaging.
Preferably, described network layer comprises source IP address and purpose IP address; Described GRE layer comprises grekey and bag sequence number.
Preferably, during the newly-built GRE node of described data packet sequencing module, with the source IP of packet and purpose IP assignment source IP and the purpose IP to the GRE node, with the grekey of GRE layer and bag sequence number assignment to the grekey of GRE node and the bag sequence number of handling.
Preferably, whether have cache node in the buffer memory chained list of the described GRE node of described data packet sequencing module check, if exist and the bag sequence number of cache node for it the complete bag sequence number of pre-treatment add 1, then data are imported into data resolution module and are continued to process; If do not exist or bag sequence number that the bag sequence number of cache node is handled before being not equal to adds 1, then go to data reception module and receive new data.
Advantage of the present invention and good effect
Because the business development of the backbone network of the Internet is very ripe, the backbone interface data that a lot of existing operation systems all are based on the Internet realize, data that can't the compatible processing mobile core network.The method of the invention only needs the A10 interface data is introduced the system that the A10 interface data is converted to the VPN data, carries out pretreatment, introduces the backbone network operation system after the preliminary treatment again, just can realize backbone network operation system processing A10 interface data.Utilize the present invention, can make the backbone network operation system need not to change just can compatible processing A10 interface data.
Description of drawings
Fig. 1 is system's network site of living in schematic diagram of A10 interface data conversion backbone network VPN data of the present invention;
Fig. 2 is GRE node and Hash table organization chart in the method for A10 interface data of the present invention conversion backbone network VPN data;
Fig. 3 is the VPN data format that has encapsulated in the method for A10 interface data conversion backbone network VPN data of the present invention;
Fig. 4 is flow chart of data processing figure in the method for A10 interface data of the present invention conversion backbone network VPN data;
Fig. 5 is the system configuration schematic diagram of A10 interface data conversion backbone network VPN data of the present invention.
Embodiment
One embodiment of the invention are as follows:
A kind of A10 interface data is converted to the method for the VPN data of backbone network, the steps include:
Initialization comprises the Hash table of GRE node when 1) starting in system, is used for follow-up Hash operation.
When 2) receiving the A10 interface data, from packet, parse source IP and the purpose IP of network layer, parse grekey and the bag sequence number of GRE layer.In Hash table, inquire about the GRE node with source IP, purpose IP and grekey as keyword.If there is no, then newly-built GRE node forwards step 3) to and continues to process this packet.If exist, then inquire about the value of the bag sequence number of having handled on the GRE node, if this value adds 1 sequence number less than the packet of current reception, illustrate that appearance is out of order, the data pack buffer of current reception on the buffer memory chained list of GRE node, wouldn't be processed, returned step 2); If this value adds 1 sequence number greater than the packet of current reception, phenomenons such as re-transmission occur is described, directly abandon the packet of current reception, return step 2); If this value adds 1 sequence number that equals the packet of current reception, illustrate that being surrounded by order receives, forward step 3) to and continue to process this packet.
The PPP load of 3) extracting packet is processed.In the PPP load, search for the PPP information frame take 0x7e as sign.Extract after the complete PPP information frame, check protocol domain.If protocol domain is designated IP, then directly extract the data field of PPP information frame, as user's business datum; If protocol domain is designated compressed format, then extract the data field of PPP information frame, decompress, with the business datum of the data after decompressing as the user.
4) extract after user's the business datum, be encapsulated in the GRE agreement, the upper-layer protocol type of GRE agreement is made as the IP type, keep the grekey of GRE layer.The network layer that the GRE layer of the raw data packets that following each layer content replication of GRE layer receives is following and link layer etc.
The user's that 5) will encapsulate business datum sends.
6) whether there is cache node in the buffer memory chained list of inspection GRE node.If the bag sequence number of existence and cache node is that the bag sequence number of handling adds 1, then go to 3) continue to process; If there is no or the bag sequence number of cache node be not equal to the bag sequence number of handling and add 1, then go to 2) continue receive data.
Detailed operation to each step is as follows: 1) initialization comprises the Hash table of GRE node.One section free memory is at first applied in initialization, is used for the Hash table that initialization comprises the GRE node.A GRE node comprises source IP address, purpose IP address, grekey, the bag sequence number of handling and buffer memory chained list, wherein with source IP address, purpose IP address and grekey as keyword.For same user, grekey is unique, but the purpose IP of the corresponding downlink data of the source IP of upstream data, therefore the source IP of the corresponding downlink data of the purpose IP of upstream data sets up two GRE nodes.Same user's data comprise upstream and downstream, can set up two GRE when processing, and are respectively both direction.
2) receive A10 interface data bag, resolution data, the Hash table of inquiry GRE node.If there is not corresponding GRE node, then newly-built GRE node enters 3) continue to process.If exist, inquire about the next one bag of the packet whether current bag handled, on the chained list that then is buffered in the GRE node, return step 2) then receive data; If current bag is next bag of the packet handled, then enter 3) continue to process.
3) process the A10 data.Cyclic search is take 0x7e as beginning flag with the PPP information frame of end mark in the ppp protocol load of packet.Extract after the complete PPP information frame, decompress, obtain user's business datum.
4) extract after user's the business datum, be encapsulated in the GRE agreement, following following each layer content of GRE layer of still using the raw data packets that receives of GRE protocol layer.
5) after packet encapsulation is finished, data are sent.
Network layer at step 1) A10 interface data comprises source IP address and purpose IP address, and the GRE layer comprises grekey and bag sequence number.Grekey is used for identifying Business Stream single in the tunnel, and the traffic data message that belongs to same user encapsulates with same grekey value.After wrapping in and finish dealing with, each the sequence number of this bag can be updated to the bag sequence number value of handling in the GRE node.Buffer sorting when the buffer memory chained list is out of order for the user data package that receives.Step 1) is for user's upstream data at this moment, and source IP address is the address of PCF, and purpose IP address is the address of PSDN; For downlink data, just in time opposite.In step 2) during newly-built GRE node, with the source IP of the network layer of packet and purpose IP assignment source IP and the purpose IP to the GRE node, with the grekey of GRE layer and bag sequence number assignment to the grekey of GRE node and the bag sequence number of handling.All with a flag byte starting and ending, this byte is 0x7e at each PPP information frame of step 3).Compression algorithm at step 3) PPP information frame is generally MPPC, VJ compression algorithm.Decompression algorithm can realize with reference to MPPC, VJ compression algorithm.Business datum the step 3) user is generally a complete IP bag.Each layer content below step 4) GRE layer comprises network layer and link layer etc.
A kind of A10 interface data is converted to the system of backbone network VPN data, comprises data reception module, data packet sequencing module, data resolution module, data encapsulation module and sending module.The sequence number that the data packet sequencing module is wrapped according to reception is finished the ordering of packet, and the Data Analysis of back is carried out in order.Data resolution module realizes resolving the data of A10 interface, finishes the decompression of data.The business datum that the data encapsulation module is responsible for the user that will extract is encapsulated as the form of the VPN data of backbone network.
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail:
Fig. 1 is that the A10 interface data turns VPN data system network site of living in schematic diagram.
Among Fig. 1, a A10 interface data of giving of the data image between PCF and the PSDN equipment in CDMA 2000 core net is turned the VPN data system.The A10 interface data turns the handling process of carrying out after the VPN data system receive data among Fig. 4, realizes the A10 interface data is converted to the VPN data format.
Fig. 2 is the organizational form of GRE node and Hash table.The GRE node has comprised the information such as source IP address, purpose IP address, grekey, the bag sequence number of handling and buffer memory chained list.Hash table is used for fast finding, interpolation and the deletion action of GRE node, with source IP address, purpose IP address and grekey as keyword.
Fig. 3 is the VPN data format that has encapsulated.Wherein, the information in link layer and the network layer replicating original packet.User's business datum is processed by data and is obtained.The concrete meaning of each field of GRE layer can be with reference to the relevant RFC document of GRE agreement.The value of each field of GRE layer is set to: K is made as 1, the existence in expression grekey territory; Protocol Type is made as 0x0800, and expression upper strata type is IP; Grekey keeps the value in the raw data packets; All the other fields all are made as 0.
Fig. 4 is the process chart that the A10 interface data is converted to the VPN data.Implementation process is as follows:
(1) system starts after the initialization, the beginning receive data.
(2) receive after the packet source IP of the network layer in the resolution data bag and purpose IP, grekey and the bag sequence number value of parsing GRE layer.In Hash table, inquire about the GRE node with source IP, purpose IP and grekey as keyword.If there is no, newly-built GRE node goes to step (4) and processes; If exist, go to step (3) and process.
(3) if the value of the bag sequence number of having handled relatively on the GRE node adds 1 and the size of the bag sequence number that receives.If it is now out of order that the former, illustrates that transmitted data on network contracts out less than the latter, the packet temporary cache that receives on the buffer memory chained list of GRE node, is returned step (2) and continues to receive new packet; If the former, illustrates that the situations such as re-transmission appear in Internet Transmission greater than the latter, abandon the packet of current reception, disregard, return step (2) and continue to receive new packet; If the former equals the latter, illustrate that Internet Transmission is normal, go to step (4) and continue to process.
(4) information on the GRE layer of resolution data bag is extracted the PPP load.In the PPP load, search for the PPP information frame take 0x7e as sign.Extract after the complete PPP information frame, check the protocol domain of PPP information frame.If protocol domain is designated IP, then directly extract the data field of PPP information frame, as user's business datum; If protocol domain is designated the compression forms such as MPPC, VJ, then extract the data field of PPP information frame, decompress, with the business datum of the data after decompressing as the user.
(5) extract after user's the business datum, encapsulate according to the VPN data format of Fig. 3.
(6) send encapsulation packet afterwards, discharge data space.The bag sequence number of packet is updated to the bag sequence number of having handled in the GRE node.
(7) whether there is cache node in the buffer memory chained list of inspection GRE node.If the bag sequence number of existence and the cache node for it complete bag sequence number of pre-treatment adds 1, then go to step (4) and continue to process; If there is no or the bag sequence number handled before being not equal to of the bag sequence number of cache node add 1, then go to step (2) and continue receive data, and finish in that the data sorting module is auxiliary.
Fig. 5 is the structural representation that A10 interface data of the present invention is converted to the system of VPN data, is applicable to said method, and it comprises data reception module, data packet sequencing module, data resolution module, data encapsulation module and sending module.Described data reception module realizes receiving in real time the data that network interface card captures.Described data packet sequencing module is responsible for carrying out the ordering of packet according to the sequence number that receives bag, if in order then continue deal with data, if out of order then temporary cache data.Described data resolution module is realized resolving the PPP information territory, finishes decompression, obtains user's business datum.The business datum that described data encapsulation module is responsible for the user that will extract is encapsulated as the form of the VPN data of backbone network.The VPN data output that described sending module realization will convert offers the follow-up business system with data.
Claims (10)
1. an A10 interface data transforms the method for backbone network VPN data, and its step comprises:
1) receive before the A10 interface data bag, initialization comprises the Hash table of GRE node, and described GRE node keyword comprises: source IP address, purpose IP address and grekey, bag sequence number and buffer memory chained list after handling;
2) receive A10 interface data bag after, parse source IP address, purpose IP address and grekey, and described source IP address, purpose IP address and grekey inquired about in described Hash table as keyword whether have corresponding GRE node to exist;
If 2-1) do not have the GRE node, newly-built GRE node then;
2-2) carry out buffer memory or abandon packet out of order or that retransmit occurring;
2-3) packet of normal in order transmission continued to process;
3) obtain user's business datum by the packet ppp load frames of extracting the described GRE of existence node;
4) described business datum is carried out the VPN encapsulation, finish the conversion of data;
5) the bag sequence number of the cache node in the buffer memory chained list of inspection GRE node is if then process in order the bag of this cache node; If not then continue buffer memory, beginning receives new data again.
2. A10 interface data as claimed in claim 1 transforms the method for key VPN data, it is characterized in that, described packet out of order or that retransmit carries out buffer memory or the method that abandons is to occurring:
1) add 1 afterwards less than receiving the packet sequence number if handled the sequence number value of packet on the GRE node, illustrate that appearance is out of order, the data pack buffer that then receives is on GRE nodal cache chained list;
2) add 1 afterwards greater than receiving the packet sequence number if handled the sequence number value of packet on the GRE node, illustrate to occur retransmitting, then abandon the packet of current reception;
3) if handled on the GRE node and equal to receive the packet sequence number after the sequence number value of packet adds 1, illustrate that data are normally orderly, continue to process.
3. A10 interface data as claimed in claim 1 transforms the method for key VPN data, it is characterized in that, in described all data of backbone network VPN, sets up two GRE nodes in each user's data; In upstream data, described source IP address is the PCF address, and described purpose IP address is the PSDN address; In downlink data, described source IP address is the PSDN address, and described purpose IP address is the PCF address.
4. A10 interface data as claimed in claim 1 transforms the method for key VPN data, it is characterized in that, described step 3) ppp load data frame according to the 0x7e flag byte as the starting and ending sign.
5. A10 interface data as claimed in claim 1 transforms the method for key VPN data, it is characterized in that, described PPP information frame obtains user service information through decompressing; The compression algorithm of described PPP information frame is generally MPPC, VJ compression algorithm.
6. an A10 interface data transforms the system of key VPN data, comprise: the sending module of VPN data after being used for receiving data reception module, data packet sequencing module, data resolution module, the data encapsulation module of A10 interface data and being used for sending conversion, it is characterized in that
Described data packet sequencing module is carried out the ordering of packet according to the packet sequence number that receives; Carry out buffer memory or abandon to the newly-built GRE node of first packet of user's uplink and downlink or to packet out of order or that retransmit occurring, the packet of orderly transmission is continued to process;
Described data resolution module obtains user's business datum for the packet ppp load frames of extracting the described GRE of existence node;
The user service data that described data encapsulation module is used for extracting is encapsulated as the form of the VPN data of backbone network.
7. A10 interface data as claimed in claim 6 transforms the system of key VPN data, it is characterized in that, in the described data encapsulation module, user's business datum is a complete IP bag, and described IP bag is by GRE layer, network layer, link layer packaging.
8. A10 interface data as claimed in claim 7 transforms the system of key VPN data, it is characterized in that, described network layer comprises source IP address and purpose IP address; Described GRE layer comprises grekey and bag sequence number.
9. transform the system of key VPN data such as claim 6 or 8 described A10 interface data, it is characterized in that, during the newly-built GRE node of described data packet sequencing module, with the source IP of packet and purpose IP assignment source IP and the purpose IP to the GRE node, with the grekey of GRE layer and bag sequence number assignment to the grekey of GRE node and the bag sequence number of handling.
10. A10 interface data as claimed in claim 9 transforms the system of key VPN data, it is characterized in that, whether there is cache node in the buffer memory chained list of the described GRE node of described data packet sequencing module check, if the bag sequence number of existence and the cache node for it complete bag sequence number of pre-treatment adds 1, then data are imported into data resolution module and continued to process; If do not exist or bag sequence number that the bag sequence number of cache node is handled before being not equal to adds 1, then go to data reception module and receive new data.
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| CN107491356A (en) * | 2017-08-28 | 2017-12-19 | 广州市百果园信息技术有限公司 | Message treatment method, terminal device and server based on sequence number |
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| CN102694738A (en) * | 2012-06-15 | 2012-09-26 | 北京傲天动联技术有限公司 | Virtual private network (VPN) gateway and method for forwarding messages at VPN gateway |
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| US6016318A (en) * | 1996-07-12 | 2000-01-18 | Nec Corporation | Virtual private network system over public mobile data network and virtual LAN |
| CN102694738A (en) * | 2012-06-15 | 2012-09-26 | 北京傲天动联技术有限公司 | Virtual private network (VPN) gateway and method for forwarding messages at VPN gateway |
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