CN102624624B - Implementation method for network address translator (NAT)-based fast channel forwarding system - Google Patents
Implementation method for network address translator (NAT)-based fast channel forwarding system Download PDFInfo
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Abstract
The invention relates to an implementation method for a network address translator (NAT)-based fast channel forwarding system. The method comprises the following steps of: adding a fast channel attribute into the definition of a stream to indicate whether the stream is transferred to a fast channel for forwarding processing or to a network layer and then processed according to a default network forwarding processing flow; adding a routing attribute into the definition of the stream to indicate routing information associated with a related network message of the stream, wherein the routing information is used for the fast channel forwarding of the related network message of the stream, so that secondary route query is avoided, and network message processing efficiency is improved; and adding a stream flag bit into the definition of the stream to indicate that: a fast channel forwarding stream attention flag bit is provided for a module paying attention to the stream, the module allows the related network message of the stream to be transferred to the fast channel for forwarding if the module sets a stream attention mark, otherwise the related network message of the stream is required to be continuously transferred to the module for processing, and after all modules paying attention to the stream set attention stream marks, a subsequent related network message of the stream is transferred to the fast channel for forwarding. According to the NAT-based fast channel forwarding method, the NAT forwarding performance of network equipment is greatly improved.
Description
Technical field
The present invention relates to the implementation method of a kind of NATXia Kuai road repeater system, belong to forwarded optimisation technique field.
Background technology
The Internet day by day prevailing, IPv4 address is day by day deficient, causes most Internet users cannot directly use access the Internet, public network IP v4 address, can only share public network IP v4 mode with NAT address transition and access the Internet.The NAT address translation performance of the network equipment, directly affects the forward efficiency of the network equipment.Internet, applications is in riotous profusion colorful, and the wide variety of applications such as amusement, commercial affairs, voice, video, information security services are infiltrated people's basic living gradually, also more and more higher to the bandwidth/forward efficiency of network.Now the network equipment oneself be not only the role who plays the part of network message forwarding person, more can carry many internet, applications as: fire compartment wall, keyword filtration, network behavior monitoring, user authenticate, NAT address transition etc.Along with the network equipment is born increasing of internet, applications, the forwarding performance of the network equipment becomes system bottleneck gradually, and the network application that affects greatly user is experienced.
Due to the shortage of IPv4 address, most Internet users all access the Internet under NAT address transition form.Along with increasing of Internet user, network equipment carrying internet, applications, the forwarding performance of the network equipment in network certainly will be subject to great impact.User accesses the network message that internet, applications produces, when need to carrying out NAT conversion except each network message, if the applied analysis that each network message is all subject to network equipment carrying as: fire compartment wall, keyword filtration, network behavior monitoring, user such as authenticate at the words of processing, it is elongated to cause processing the cpu clock cycle that single network message consumes, and directly affects the network message forwarding performance of CPU within the unit interval.Also exist and adopt special hardware module to carry out NAT conversion and forward process at present, to improve the solution of network equipment forwarding performance.But in upgrading enterprise network device hardware, also exist expensive fund cost and drop into, discard the network equipment getting off in the to a certain degree wasting of resources of Ye Shi enterprise.In fact for each relevant network message of each data flow of each application, confirm to allow after forwarding at the network equipment of flowing through, this data flow follow-up relevant network message is without transferring relevant internet, applications resume module to as fire compartment wall again, keyword filtration, network behavior monitoring, user authenticates etc., NAT information/routing iinformation in directly flowing under Adoption Network message can be transferred by NATXia Kuai road repeater system and carry out forward process, shorten greatly the cpu clock cycle that single network message consumes, network message forwarding performance in the CPU unit interval will promote at double.
Summary of the invention
The present invention is directed to the deficiency that network equipment carrying internet, applications increases, NAT address transition forward efficiency is low, provide the implementation method of a kind of linux NATXia Kuai road repeater system, to improve the forwarding performance of the network equipment.
Object of the present invention is achieved through the following technical solutions:
The implementation method of NATXia Kuai road repeater system increases a fast road of attribute in the definition of stream, represents whether stream is transferred You Kuai road forward process or transfer by network layer by the forwarded handling process processing of acquiescence, in the definition of stream, increase an attribute route, represent the routing iinformation of stream network of relation message association, when Kuai road forwarding flow network of relation message, use, avoid secondary routing inquiry, improve network message treatment effeciency, in stream definition, increase by an attribute flow label position, representing provides fast road forwarding flow to pay close attention to marker bit to the module of closing beam, if module is paid close attention to flow label set, module allows stream network of relation message to transfer the forwarding of You Kuai road, otherwise stream network of relation message need continue to transfer by resume module, when all concern modules of stream will be paid close attention to after flow label set, flow follow-up network of relation message and will transfer the forwarding of fast road, it is characterized in that: be input as the network message that needs forward, first obtain the stream that network message is corresponding, transfer network layer less than, network message and forward by the forwarded handling process of acquiescence if obtained, set up the stream under network message by Linux conntrack module, otherwise Liu Kuai road attribute under inspection network message, if You Kuai road repeater system processing forward network message is transferred in Liu Kuai road attribute set under network message, otherwise network message is transferred network layer and is forwarded by the forwarded handling process of acquiescence,
In the time that network message transfer network layer forwards by the forwarded handling process of acquiescence, set up the affiliated stream of network message, transfer the internet, applications module analysis processing network message that closes beam simultaneously, to the flow label bit attribute flowing under network message is carried out to set, final decision closes whether the internet, applications module of beam allows under fast road transmission network message stream and to Liu Kuai road attribute set under network message, simultaneously after via network layer routing inquiry, the routing property flowing under the routing iinformation that network message is inquired and network message is carried out stream by information association,
In the time that network message is transferred You Kuai road repeater system processing forward network message, first network message is carried out to NAT conversion, then obtain network message routing iinformation transmission network message according to the routing property flowing under network message.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progressive being mainly reflected in:
The present invention proposes the method that NATKuai road forwards, and has improved greatly network equipment NAT forwarding performance; Propose stream binding routing iinformation, shorten the own network message routing inquiry time of setting up stream; Flow label position is proposed, allow internet, applications to pay close attention to this stream and be not only the network message of this stream, in the time that all internet, applications are no longer paid close attention to this stream, the follow-up network of relation message of this stream directly carries out the forwarding of NATKuai road, no longer transfer internet, applications processing, greatly reduce cpu resource consumption.
Brief description of the drawings
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Fig. 1: NATKuai road forwards fast road stream handling process schematic diagram;
Fig. 2: NATKuai road forwards Fei Kuai road stream handling process schematic diagram;
Fig. 3: NATKuai road forwards event handling schematic flow sheet.
Embodiment
Utilize the existing flow structure of Linux, NAT information, routing iinformation, proposed NATXia Kuai road and forwarded thought, the forwarded under NAT is improved to NATXia Kuai road and forwards, improved greatly the forwarding performance of system.By increase " fast road ", " route ", " flow label position " in stream definition, realize NATXia Kuai road repeater system, to reach the object of fast-forwarding network message raising network equipment forwarding performance under NAT.Below will set forth specific implementation way.
The connection of IP or TCP or UDP or other agreement in network, finally all can be summed up as a stream in the network equipment, information the most basic in stream can comprise following attribute: source address, source port, destination address, destination interface, procotol, NAT etc., can expand in actual applications as required.In the design of NATXia Kuai road repeater system, in stream definition, increase attribute " fast road ", represent whether this stream is transferred You Kuai road forward process or transfer by network layer by the forwarded handling process processing of acquiescence; In the definition of stream, increase attribute " route ", represent the routing iinformation of this stream network of relation message association, when Kuai road forwarding flow network of relation message, use, avoid secondary routing inquiry, improve network message treatment effeciency; In stream definition, increase attribute " flow label position ", representing provides fast road forwarding flow to pay close attention to marker bit to the internet, applications module of paying close attention to this stream, if internet, applications module stream is paid close attention to flow label set, this internet, applications module allows this stream network of relation message to transfer the forwarding of You Kuai road, otherwise this stream network of relation message need continue to transfer by this internet, applications resume module, be somebody's turn to do the design of " flow label position " attribute, can support repeater system Kuai road, fast road forwarding decision, can support again internet, applications to process the relevant network message of specific stream.
Below will be taking HTTP download as example, the method for designing of brief description NATXia Kuai road repeater system:
1) Intranet client is initiated to connect by Transmission Control Protocol, is forwarded to public network server HTTP connects via the network equipment.
2) TCP connects and initiates and during via device forwards, the network equipment is set up for this stream being connected with NAT information according to the source address in network message, source port, destination address, destination interface, procotol.Fast road repeater system is according to relevant information query routings such as source/order way addresses and be tied to " route " attribute in stream definition.
3) internet, applications module is loading Shi Xiangkuai road repeater system application " flow label position " attribute at stream as: fire compartment wall, keyword filtration, network behavior monitoring, user authenticate etc.Internet, applications module, after a series of network message is processed, confirm not pay close attention to the follow-up network of relation message of this stream, " flow label position " set that internet, applications module stream can be paid close attention to, represent that this internet, applications module allows fast road to forward the follow-up relevant network message of this stream, the follow-up relevant network message of this stream is no longer transferred this internet, applications resume module.
4) when paying close attention to all internet, applications modules of this stream, after " flow label position " set that stream is paid close attention to, fast road repeater system integrated decision-making thinks that this stream can carry out the forwarding of fast road, " fast road " attribute of stream is carried out to set, represent the follow-up network of relation message Jiang Youkuai of this stream road repeater system processing.
5) all HTTP of this stream download relevant network message to reaching after equipment, first check the whether set of " fast road " attribute of stream, if set is directly transferred fast road repeater system according to " NAT ", " route " attribute processing forward network message in stream, shorten greatly the cpu clock cycle that processing forward network message takies, the efficiency of processing network message in the network equipment unit interval will promote at double, and the HTTP downloading rate between Intranet client and public network server will obviously rise.
NATXia Kuai road repeater system idiographic flow is: be 1. input as the network message that needs forwarding, first obtain the stream that network message is corresponding, if obtain and transfer network layer less than, network message and forward by the forwarded handling process of acquiescence, so that the stream under being set up according to network message information, NAT information of address conversion by Linux conntrack module.Otherwise " fast road " attribute of stream under inspection network message, if under network message, You Kuai road repeater system processing forward network message is transferred in " fast road " attribute set of stream, otherwise network message transfer network layer forwards by the forwarded handling process of acquiescence.
2. in the time that network message transfer network layer forwards by the forwarded handling process of acquiescence, if affiliated stream of this network message do not set up, first set up affiliated stream by Linux conntrack module according to network message information, NAT information of address conversion.Transfer internet, applications module [as fire compartment wall, keyword filtration etc.] the analyzing and processing network message of paying close attention to this stream simultaneously, to " flow label position " attribute flowing under network message is carried out to set, whether stream is to paying close attention to the internet, applications module of this stream and allow fast road to forward and to " fast road " the attribute set of flowing under network message under final decision network message.Simultaneously after via network layer routing inquiry, " route " attribute flowing under the routing iinformation that network message is inquired and network message carries out stream by information association, carries out secondary routing inquiry while avoiding Kuai road repeater system forward process network message.
3. in the time that network message is transferred You Kuai road repeater system processing forward network message, You Kuai road repeater system carries out NAT conversion to network message, obtains network message routing iinformation transmission network message according to " route " attribute flowing under network message.
The proposition of the method for designing of NATXia Kuai road repeater system, the optimization that is the path to network equipment conventional network layer forward process network message is simplified, shortened greatly the cpu clock cycle that processing forward network message takies, the efficiency of processing network message in the network equipment CPU unit interval will promote at double.NATXia Kuai road repeater system relevant treatment flow process is as follows:
The road of NATKuai shown in Fig. 1 forward process flow process, is input as network equipment transmission network message.First obtain the stream under network message, obtain less than or stream " fast road " attribute not set network message transfer YouNATKuai Dao Feikuai road stream handling process and forward (as Fig. 2) by the forwarded handling process of acquiescence.If the stream under network message " fast road " attribute set, transfers NATKuai road repeater system and forward, correlation step is described as follows: 1) NAT address transition, wherein comprises the conversion of SNAT source address or the conversion of DNAT destination address; 2) obtain stream " route " attribute, according to routing iinformation transmission network message; If stream " route " attribute is not associated with routing iinformation, network message is carried out to routing inquiry; Successful inquiring, by routing iinformation and stream " route " Attribute Association, is carried out secondary routing inquiry while avoiding this stream network of relation message of follow-up forwarding, to improve routing forwarding efficiency; If routing inquiry failure, directly abandons network message and returns.
The road of NATKuai shown in Fig. 2 forwards Fei Kuai road stream handling process, is input as network equipment transmission network message.When network message obtain less than or stream " fast road " attribute not set network message transfer YouNATKuai Dao Feikuai road stream handling process and forward by the forwarded handling process of acquiescence, correlation step is described as follows: 1), if network message is not set up stream in the network equipment, set up flow structure according to the source address in network message, source port, destination address, destination interface, procotol; 2) check whether network message needs to carry out NAT conversion if desired, " NAT " attribute of stream is set at stream, and network message is carried out to NAT conversion; 3) obtain stream " route " attribute, according to routing iinformation transmission network message; If stream " route " attribute is not associated with routing iinformation, network message is carried out to routing inquiry.Successful inquiring, by routing iinformation and stream " route " Attribute Association, is carried out secondary routing inquiry while avoiding this stream network of relation message of follow-up forwarding.Routing inquiry failure directly abandons network message and returns; Network message is handed over to internet, applications module by default network forward process flow process, carries out analyzing and processing.If internet, applications module is no longer paid close attention to this stream subsequent network message, by internet, applications module flow label position " attribute carries out set; represent that the follow-up network of relation message of this stream is without transferring this internet, applications resume module again, otherwise follow-up this stream network of relation message will be continued to transfer this internet, applications resume module; 4) check the whether whole set of all internet, applications module flow label bit attributes in stream, do not paying close attention to the follow-up network of relation message of this stream if show all internet, applications modules, will flow " fast road " attribute set, YouNATKuai road repeater system is carried out fast road forwarding (as Fig. 1) by the follow-up network of relation message of this stream, without transferring by the forwarded flow processing of giving tacit consent to and treatment effeciency is low again.
As Tu3NATKuai road forwards event response handling process, input NATKuai road repeater system external event, correlation step is described as follows: 1) internet, applications module application for registration stream " flow label position " attribute event, NATXia Kuai road repeater system closes " flow label position " attribute of beam for internet, applications module provides, and internet, applications module shows whether continue to pay close attention to the follow-up network of relation message of this stream by the set of " flow label position " attribute of convection current." flow label position " attribute of stream can internet, applications module during in initialization to the repeater system application for registration of NATXia Kuai road; 2) the stream pin event of dying, the connection of IP or TCP or UDP or other agreement in network, complete transfer of data or abnormal conditions can be by connection closed, the stream that network device internal is corresponding with this connection also can be sold and die thereupon.If there is record in this Liu Jikuai road repeater system, will in Gai Liucongkuai road repeater system, delete; 3) network equipment routing change event.Circulation overcurrent " route " attribute that repeater system Nei Kuai road, fast road forwards is associated with routing iinformation, carries out secondary routing inquiry, to improve routing forwarding efficiency while avoiding this stream network of relation message of follow-up forwarding.Therefore in the time of network equipment routing change, " route " attribute of the stream that repeater system Xu Duikuai road, fast road forwards refreshes, and guarantees that the follow-up network of relation message of this stream forwards by correct routing iinformation.
Although the design of NATXia Kuai road repeater system has promoted network equipment forwarding performance greatly, certain connection under some application scenarios cannot forward by fast road repeater system.For example Intranet is built ftp server, user adopt port mapping technology access network equipment public network IP v4 address so that access Intranet build ftp server downloading data time, FTP data connect and can forward by NATXia Kuai road repeater system, and FTP control connection must be transferred by ALG ALG resume module amendment network message application layer relevant field and cannot transfer by NATXia Kuai road repeater system and forward.For similar application scene, NATXia Kuai road repeater system needs correct identification to control stream and data flow, and dissimilar connection adopts corresponding pass-through mode, to reach optimization forward-path, improves the object of network equipment forwarding performance.
Can consider module integrated ALG ALG to repeater system inside, NATXia Kuai road simultaneously, but along with NATXia Kuai road repeater system internal integration ALG ALG module increases gradually, will greatly affect NATXia Kuai road repeater system network message forward efficiency.Therefore the application scenarios special to some, NATXia Kuai road repeater system should be distinguished and treat, to reach object efficient, fast-forwarding network message.
In sum, the present invention proposes a kind of novel forwarding model, the original repeater system of the network equipment basis on newly speed repeater system.In stream definition, increase " fast road " attribute, identify fast road forwarding flow.In stream definition, increase " route " attribute, associated stream routing iinformation uses while sending out, avoids secondary query routing in repeating process.In stream definition, increase " flow label position " attribute, take into account the processing of internet, applications module pass beam network of relation message.The optimization in the path to legacy network devices forward process network message is simplified, and has shortened greatly the cpu clock cycle that processing forward network message takies, and the efficiency of processing network message in the network equipment CPU unit interval will promote at double.
It is to be understood that: the above is only the preferred embodiment of the present invention; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (1)
- The implementation method of 1.NATXia Kuai road repeater system increases a fast road of attribute in the definition of stream, represents whether stream is transferred You Kuai road forward process or transfer by network layer by the forwarded handling process processing of acquiescence, in the definition of stream, increase an attribute route, represent the routing iinformation of stream network of relation message association, when Kuai road forwarding flow network of relation message, use, avoid secondary routing inquiry, improve network message treatment effeciency, in stream definition, increase by an attribute flow label position, representing provides fast road forwarding flow to pay close attention to marker bit to the module of closing beam, if module is paid close attention to flow label set, module allows stream network of relation message to transfer the forwarding of You Kuai road, otherwise stream network of relation message need continue to transfer by resume module, when all concern modules of stream will be paid close attention to after flow label set, flow follow-up network of relation message and will transfer the forwarding of fast road, it is characterized in that: be input as the network message that needs forward, first obtain the stream that network message is corresponding, transfer network layer less than, network message and forward by the forwarded handling process of acquiescence if obtained, set up the stream under network message by Linux conntrack module, otherwise Liu Kuai road attribute under inspection network message, if You Kuai road repeater system processing forward network message is transferred in Liu Kuai road attribute set under network message, otherwise network message is transferred network layer and is forwarded by the forwarded handling process of acquiescence,In the time that network message transfer network layer forwards by the forwarded handling process of acquiescence, set up the affiliated stream of network message, transfer the internet, applications module analysis processing network message that closes beam simultaneously, to the flow label bit attribute flowing under network message is carried out to set, final decision closes whether the internet, applications module of beam allows under fast road transmission network message stream and to Liu Kuai road attribute set under network message, simultaneously after via network layer routing inquiry, the routing property flowing under the routing iinformation that network message is inquired and network message is carried out stream by information association,In the time that network message is transferred You Kuai road repeater system processing forward network message, first network message is carried out to NAT conversion, then obtain network message routing iinformation transmission network message according to the routing property flowing under network message.
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