CN108881033A - Highspeed user's source tracing method towards LTE network based on FPGA+NPU - Google Patents
Highspeed user's source tracing method towards LTE network based on FPGA+NPU Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/02—Capturing of monitoring data
- H04L43/028—Capturing of monitoring data by filtering
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/04—Processing captured monitoring data, e.g. for logfile generation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
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Abstract
The invention discloses a kind of highspeed user's source tracing method towards LTE network based on FPGA+NPU, is mainly technically characterized by：Subscriber signaling message is diverted to CPU module and user data message is diverted to FPGA module；The subscriber association information obtained after parsing is sent to FPGA module and NPU module by CPU module, and the lookup of user data message and user message table is divided into two modules of FPGA and NPU to realize；CPU module learns gateway address when parsing subscriber signaling Receive message subscriber association information；FPGA module receives user data message and send the source IP of packet outer layer+place IP into the plug-in TCAM of FPGA module and matches to form line flag up and down, FPGA module searches user message table according to up-downlink direction and carries out fields match, the user information that successful match then will acquire is filled up on user data message and exports, and it fails to match then send NPU module to carry out second of matching user data message.It has the advantages that trace to the source rapidly and efficiently, accuracy it is high.
Description
Technical field
The invention belongs to technical field of network security, and in particular to a kind of high speed towards LTE network based on FPGA+NPU
User's source tracing method.
Background technique
In GSM and 3G network epoch, network monitoring system believes the user data split from wireless access network and user
It enables, front-end acquisition device is taken to shunt the mode that handles with more back-end analysis machines to realize that tracing to the source for user data is associated with.It steps into
LTE epoch, mobile communication technology of the LTE network as a new generation, either in core network architecture or wireless access technology side
Face is all varied widely, as network user's number and data traffic have the growth of geometry grade, LTE core network (EPC)
In use a variety of different agreements, such as GTP, SCTP functions such as access, safety certification, the mobile managements of completing user,
And these agreements use on different interfaces, as Stream Control Transmission Protocol has application, GTP agreement to exist at S1-MME mouthfuls and S6a mouthfuls
It is applied on S11, S10 interface, since the signaling between multiple interfaces needs interrelated parsing that could completely obtain a user
Relevant information, in addition LTE core network use new security mechanism, NAS (NonAccess Stratum) message use ciphertext
Mode is transmitted, this just traces to the source to the user of network monitoring system, and more stringent requirements are proposed for association, is also supervised to the signaling of LTE network
Survey brings new technical problem.
In background technique, Chinese patent " a kind of the user towards LTE network trace to the source correlating method and front-end acquisition device "（Specially
Benefit number：201510887134.4）It proposes a kind of user towards LTE network to trace to the source correlating method and front-end acquisition device, skill
Art scheme is that signaling resolution processing and user are traced to the source to be associated in front-end acquisition device and be realized, is used with meeting growing network
The requirement of amount mesh and data traffic solves the problems, such as background analysis machine load excessive, but the program is primarily present two deficiencies：
1, when FPGA receives related information and generates user information look-up table, can not conflict to present in user information look-up table
Item is managed, and the corresponding user data message of the item that leads to a conflict can not trace to the source；
2, user data message can not directly determine source IP or place IP or IP address, therefore search user information and search
May require to look up when table could search success twice；
In view of the deficienciess of the prior art, we are to highspeed user's source tracing method towards LTE network based on FPGA+NPU
It is studied.
Summary of the invention
It is an object of the invention to provide a kind of highspeed user side of tracing to the source towards LTE network based on FPGA+NPU
Method, the search procedure of user data message and user message table is divided into two modules of FPGA and NPU to realize by it, while its
CPU module introduces gateway address study, realize it is disposable distinguish source IP or place IP, both improved user and traced to the source speed, having can
Effectively improve the accuracy that user traces to the source.
The present invention in order to solve the above technical problems, the technical solution adopted is that：
A kind of highspeed user's source tracing method towards LTE network based on FPGA+NPU, including：
1, network system is from interface message；
2, the message is filtered and is classified, filtration treatment is to abandon exception message, overlength or ultrashort message, non-IP report
The message is divided into the subscriber signaling message and at least including at least SCTP, GTP-C control message according to agreement and port by text
User data message including GTP-U data message；
3, the subscriber signaling message is diverted to CPU module, and the user data message is diverted to FPGA module；
4, the CPU module receives the subscriber signaling message, by the subscriber signaling message be diverted to each multicore thread into
The subscriber association information is sent to the FPGA module and NPU module to obtain subscriber association information by row signaling resolution；
5, the CPU module is while parsing subscriber signaling message to obtain subscriber association information, to gateway address
It practises, the address learnt generation two rule of uplink and downlink is written in the plug-in TCAM of the FPGA module, and in correspondence
SRAM in mark corresponding message direction；
6, the FPGA module and the NPU module receive the subscriber association information that the CPU module is sent, respectively with User IP
Field is that index generates respective user message table, and is respectively written into respectively plug-in DDR；
7, the FPGA module receives user data message, and the source IP of the user data message outer layer+place IP is sent to described
It is matched in the plug-in TCAM of FPGA module, the line flag up and down of matching result is filled in into user datagram after successful match
In the SMAC of text；
8, the FPGA module searches user message table according to the message up-downlink direction in the SMAC and carries out fields match, if
The user information that matching obtains then is filled up on the user data message and is exported by successful match, by institute if it fails to match
It states user data message and send the NPU module；
9, the NPU module receives the user data message that the FPGA module fields match is unsuccessfully sent, according to the SMAC
In message up-downlink direction search the NPU module self maintained user message table carry out second of fields match, if
Then the user information that matching obtains is filled up on user data message with success and FPGA module is sent to export, if it fails to match
Discarding is disregarded；
10, the FPGA module exports user data information, sends user data information to accordingly according to configuration information is shunted
Back-end analysis machine, to carry out association process of tracing to the source to user data.
Further, when the message being filtered and classified according to the message received, further include：
Head removing is carried out to VLAN and MPLS.
Further, the CPU module learns gateway address, and mode of learning includes：
CPU module learns the address SGW or PGW of the address SGW or eNB of S1-U interface, S8 interface, if source is the gateway learned
Address is then labeled as downlink message, is labeled as uplink message if the gateway address learned is in place side.
Further, user message table is searched according to the message direction in the SMAC when the FPGA module and carries out field
When matching, including：
It then takes source IP to search user message table if uplink message, place IP is then taken to search user message table if downlink message, if
Uplink and downlink is unknown, then searches in the way of source IP after first place IP.
Further, when the NPU module is believed according to the user that NPU module self maintained is searched in the message direction in SMAC
When ceasing table second of fields match of progress, including：
It then takes source IP to search user message table if uplink message, place IP is then taken to search user message table if downlink message, if
Uplink and downlink is unknown, then searches in the way of source IP after first place IP.
The beneficial effects of the present invention over the background art are as follows
1, the present invention uses the duplicate association mode of FPGA module+NPU module, by looking into for user data message and user message table
It looks for process to be divided into two modules of FPGA and NPU to realize, overcomes the prior art because can not be to existing in user information look-up table
Conflict item be managed the defect that can not be traced to the source so as to cause the corresponding user data message of conflict item；
2, CPU module learns gateway address while parsing subscriber signaling message to obtain subscriber association information, and
By in learning outcome write-in FPGA plug-in TCAM, FPGA first sends data message in TCAM before association to be compared, to obtain
The row information up and down of message is taken, disposable differentiation source IP or place IP is realized, the prior art is effectively avoided to search user message table
Shi Keneng is required to look up twice could be successfully insufficient, improves the efficiency traced to the source；
3, it have the advantages that trace to the source rapidly and efficiently, accuracy it is high.
Detailed description of the invention
Fig. 1 is that the present invention is based on the workflow schematic diagrams of highspeed user's source tracing method towards LTE network of FPGA+NPU.
Specific embodiment
Further description is carried out to the present invention with reference to the accompanying drawing.
As shown in Figure 1, a kind of highspeed user's source tracing method towards LTE network based on FPGA+NPU, including：
1, network system is from interface message；
2, the message is filtered and is classified, filtration treatment is to abandon exception message, overlength or ultrashort message, non-IP report
Text, while message is divided by two class of subscriber signaling message and user data message according to agreement and port, it is completed at the same time to VLAN
Head removing is carried out with MPLS；
The subscriber signaling message includes at least Flow Control Transmission Protocol (Stream Control Transmission
Protocol, abbreviation SCTP), GPRS Tunnel Protocol control (GPRS Tunnelling Protocol Control, abbreviation GTP-
C) message wherein includes application protocol and NAS protocol massages in SCTP, includes subscriber signaling field in GTP-C；
The user data message includes at least GPRS Tunnel Protocol user data (GPRS Tunnelling Protocol
User, abbreviation GTP-U) message includes user data fields in GTP-U；
3, the subscriber signaling message is diverted to CPU module, and the user data message is diverted to field programmable gate array
(Field-Programmable Gate Array, abbreviation FPGA) module；
4, the CPU module receives the subscriber signaling message, by the subscriber signaling message be diverted to each multicore thread into
The subscriber association information is sent to the FPGA module and NPU module to obtain subscriber association information by row signaling resolution；
5, the CPU module is while parsing subscriber signaling message to obtain subscriber association information, to gateway address
It practises, the plug-in TCAM of the FPGA module is written into the address learnt generation two rule of uplink and downlink（Ternary
Content Addressable Memory, three-state content addressing memory）In, and corresponding report is marked in corresponding SRAM
Literary direction；
When the CPU module learns gateway address, mode of learning is：CPU module learn S1-U interface SGW or
The address eNB, S8 interface the address SGW or PGW, downlink message is labeled as if source is the gateway address learned, if place side is
The gateway address learned then is labeled as uplink message；
6, the FPGA module and the NPU module receive the subscriber association information that the CPU module is sent, respectively with User IP
Field is that index generates respective user message table, and is respectively written into respectively plug-in Double Data Rate synchronous DRAM
In (Double Data Rate, abbreviation DDR)；
Because DDR has the storage read write attribute of large capacity high bandwidth, the process performance of the method for the present invention can be improved using DDR, prop up
Hold large-scale number of users and the processing of big band data；
7, the FPGA module receives user data message, and the source IP of the user data message outer layer+place IP is sent to described
It is matched in the plug-in TCAM of FPGA module, the line flag up and down of matching result is filled in into user datagram after successful match
In the SMAC of text；
The TCAM of the plug-in use of FPGA module can also be by using DDR, Hash table（Hash table）Etc. modes realize；
8, the FPGA module searches user message table according to the message up-downlink direction in the SMAC and carries out fields match, if
It then takes source IP to search user message table for uplink message, then takes place IP to search user message table if downlink message, if uplink and downlink
It is unknown, then it is searched in the way of source IP after first place IP；
If successful match, the user information that matching obtains is filled up on the user data message and is exported, if matching is lost
It loses, send the user data message to the NPU module；
9, the NPU module receives the user data message that the FPGA module fields match is unsuccessfully sent, according to the SMAC
In message up-downlink direction search the NPU module self maintained user message table carry out second of fields match, if
Uplink message then takes source IP to search user message table, then takes place IP to search user message table if downlink message, if uplink and downlink is not
Know, is then searched in the way of source IP after first place IP；
If successful match, the user information that matching obtains is filled up on user data message and FPGA module is sent to export, if
It fails to match then abandon disregard；
10, the FPGA module exports user data information, sends user data information to accordingly according to configuration information is shunted
Back-end analysis machine, to carry out association process of tracing to the source to user data.
In the technical solution of above-described embodiment, handle user trace to the source be associated with when, message is filtered in advance, classify and
Shunt, using CPU multicore thread process subscriber signaling message (or claiming protocol massages, control message etc.), using FPGA module+
The search procedure of user data message and user message table is divided into two moulds of FPGA and NPU by the duplicate association mode of NPU module
Block realizes, pass through introduce gateway address study, user data message uplink and downlink acquisition of information, TCAM are searched and uplink and downlink judgement
Deng overcoming the prior art because can not be to user while greatly reducing the workload of signaling resolution of back-end analysis machine
Conflict item present in information searching table is managed to be lacked so as to cause what the corresponding user data message of conflict item can not trace to the source
It falls into, it can be achieved that disposable differentiation source IP or place IP, effectively avoid the prior art that from may requiring to look up when searching user message table
It twice could be successfully insufficient.
Above-mentioned described embodiment is only a certain specific embodiment of the invention, is not made in any form to the present invention
Limitation, those of ordinary skill in the art without making creative work, based on technical solution of the present invention institute into
Capable variation, modification, replacement or modification all other embodiment obtained, belong to protection scope of the present invention.
Claims (5)
1. a kind of highspeed user's source tracing method towards LTE network based on FPGA+NPU, it includes:
Network system is from interface message；
The message is filtered and is classified, filtration treatment to abandon exception message, overlength or ultrashort message, non-IP packet,
The message is divided into the subscriber signaling message including at least SCTP, GTP-C control message according to agreement and port and is at least wrapped
Include the user data message of GTP-U data message；
The subscriber signaling message is diverted to CPU module, and the user data message is diverted to FPGA module；
The CPU module receives the subscriber signaling message, and the subscriber signaling message is diverted to each multicore thread and is carried out
The subscriber association information is sent to the FPGA module and NPU module to obtain subscriber association information by signaling resolution；
The FPGA module receives the subscriber association information of the CPU module, is that index generates user information with User IP field
Table, and be written in the plug-in DDR of the FPGA module；
The FPGA module receives user data message, and the user data message and the user message table are carried out field
Match, the user information that matching obtains is filled up on the user data message and is exported if successful match；
The FPGA module exports user data information, after sending user data information to accordingly according to shunting configuration information
Analysis machine is held, to carry out association process of tracing to the source to user data；
It is characterized in that, it further includes：
The CPU module learns gateway address when parsing subscriber signaling message to obtain subscriber association information,
The address learnt generation two rule of uplink and downlink is written in the plug-in TCAM of the FPGA module, and corresponding
Corresponding message direction is marked in SRAM；
When subscriber association information is sent to the FPGA module by the CPU module, while subscriber association information is sent to institute
NPU module is stated, the NPU module is that index generates itself with User IP field according to the subscriber association information received
The user message table of maintenance, and be written in the plug-in DDR of the NPU module；
The FPGA module receives user data message, and user data message and the user message table of the FPGA module are carried out
Before fields match, including：
The source IP of the user data message outer layer+place IP is sent into the plug-in TCAM of the FPGA module and is matched,
With the line flag up and down of matching result is filled in the SMAC of user data message after success；
The FPGA module searches user message table according to the message up-downlink direction in the SMAC and carries out fields match；
When user data message and user message table are carried out fields match by the FPGA module, by institute if fields match failure
It states user data message and send the NPU module；
The NPU module receives the user data message that FPGA module fields match is unsuccessfully sent, according to the report in the SMAC
The user message table that literary up-downlink direction searches the NPU module self maintained carries out second of fields match, if successful match
Then the user information that matching obtains is filled up on user data message and FPGA module is sent to export；
The NPU module receives the user data message that FPGA module fields match is unsuccessfully sent, according to the report in the SMAC
When the user message table that literary up-downlink direction searches the NPU module self maintained carries out fields match, lost if it fails to match
Abandoning is disregarded.
2. highspeed user's source tracing method towards LTE network according to claim 1 based on FPGA+NPU, feature exist
In further including when the message being filtered and classified according to the message received：
Head removing is carried out to VLAN and MPLS.
3. highspeed user's source tracing method towards LTE network according to claim 1 based on FPGA+NPU, feature exist
In the CPU module learns gateway address, and mode of learning includes：
CPU module learns the address SGW or PGW of the address SGW or eNB of S1-U interface, S8 interface, if source is the gateway learned
Address is then labeled as downlink message, is labeled as uplink message if the gateway address learned is in place side.
4. highspeed user's source tracing method towards LTE network according to claim 1 based on FPGA+NPU, feature exist
In, when the FPGA module, which searches user message table according to the message direction in the SMAC, carries out fields match, including：
It then takes source IP to search user message table if uplink message, place IP is then taken to search user message table if downlink message, if
Uplink and downlink is unknown, then searches in the way of source IP after first place IP.
5. highspeed user's source tracing method towards LTE network according to claim 1 based on FPGA+NPU, feature exist
In when the NPU module carries out second according to the user message table that NPU module self maintained is searched in the message direction in SMAC
When fields match, including：
It then takes source IP to search user message table if uplink message, place IP is then taken to search user message table if downlink message, if
Uplink and downlink is unknown, then searches in the way of source IP after first place IP.
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