CN103929503B - The processing method of route device and its network package - Google Patents
The processing method of route device and its network package Download PDFInfo
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- CN103929503B CN103929503B CN201310011161.6A CN201310011161A CN103929503B CN 103929503 B CN103929503 B CN 103929503B CN 201310011161 A CN201310011161 A CN 201310011161A CN 103929503 B CN103929503 B CN 103929503B
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Abstract
The present invention is related to a kind of route device, including forwarding engine modules and nucleus module, and can be used to perform the processing method of network package.The processing method of network package comprises the following steps.Network package is received from source interface.Judge whether network package meets network address translation（Network Address Translation, NAT）Package condition.When network package meets NAT package conditions, following steps are performed.The transmission information of network package is read, and information inquiry NAT mapping tables are transmitted in utilization.When there is the map entries of correspondence transmission information in NAT mapping tables, order forwarding engine modules update the shelves head of network package, and the purpose interface of setting network package according to the NAT forwarding informations of corresponding map entries.Consequently, it is possible to be not required to quickly carry out NAT conversions via nucleus module, and the treatment effeciency of network package can be greatly improved.
Description
Technical field
The present invention is on a kind of network equipment and its processing method of network package, particularly a kind of route device and its net
The processing method of network package.
Background technology
In a computer network, network address translation (Network Address Translation, NAT) is a kind of net
Network package is by rewriteeing source Internet protocol suite (Internet Protocol, IP) when router (router) or fire wall
Address or the technology of purpose IP address.It can utilize internet in a NAT router between local network and world-wide web
One or more public (public) IP that Internet Service Provider (Internet Service Provider, ISP) provides
Location is connected to world-wide web, and privately owned (privacy) the IP address progress NAT conversions of client in local network are connected to
World-wide web.
But in order to carry out NAT conversions, NAT router needs to check whether all network packages received meet one by one
Data in one NAT mapping tables.If the data not met in table, need to sentence using pre-set multiple rule
Whether circuit network package needs to carry out NAT study (learning) and conversion.And all network packages are required for via NAT
One driver element of servomechanism sends a core cell to, then is judged by core cell, learnt or changed.
Due to any network package once sending core cell to, regardless of whether there is its necessity all can be for medium accesses
Key-course (Medium Access Control layer, MAC layer), IP layers or transmission control agreement layer
Inspection and processing that (Transmission Control Protocol layer, TCP layer) etc. is layered, therefore
A large amount of meaningless computings and processing time can be also expended even for the simple NAT conversions for having data in table, and is made
Into package delay.Furthermore, for there is the local network of NAT conversion requirements, essentially all of package is required for carrying out NAT turns
Change, therefore substantial amounts of conversion requirements more cause the problem of package postpones to aggravate.
The content of the invention
In order to solve the problem of above-mentioned traditional NAT is changed, the present invention provides a kind of route device (routing device)
And its processing method of network package.Wherein route device includes a forwarding engine modules (Forwarding Engine, FWD)
And a nucleus module, and can be used to perform the processing method of network package.
The processing method of network package comprises the following steps.A network package is received from a source interface.Judge that network is sealed
Whether bag meets a network address translation (Network Address Translation, NAT) package condition.Work as network package
When meeting NAT package conditions, following steps are performed.A transmission information of network package is read, and information inquiry one is transmitted in utilization
NAT mapping tables.When there is a map entries (the mapping entry) of correspondence transmission information in NAT mapping tables, order forwarding engine
Module updates the shelves head (header) of network package according to a NAT forwarding informations of corresponding map entries, and setting network is sealed
The interface of one mesh of bag.
Implement example according to one, forwarding engine modules are to perform following steps.Network package is received from source interface.Sentence
Whether circuit network package meets NAT package conditions.When network package meets NAT package conditions, following steps are performed.Read net
The transmission information of network package, and information inquiry NAT mapping tables are transmitted in utilization.Reflecting for information is transmitted when there is correspondence in NAT mapping tables
When penetrating project, the NAT forwarding informations according to corresponding map entries update the shelves head of network package, and the mesh of setting network package
Interface.When network package does not meet NAT package conditions, network package is transferred into nucleus module, with by nucleus module
Manage network package.And nucleus module does not meet in the network package of NAT package conditions, or NAT mapping tables no pair to handle
The network package for any one map entries answered.
In summary, the processing method of route device and its network package can interpolate that whether network package meets NAT envelopes
Bag condition, and forwarding engine modules can voluntarily handle the network package for meeting NAT package conditions, to mitigate the negative of nucleus module
Load and meaningless processing time.
Brief description of the drawings
Figure 1A is the block schematic diagram of a route device for implementing example；
Figure 1B is the block schematic diagram of the route device of another implementation example；
Fig. 2 is the schematic flow sheet of the processing method of a network package for implementing example；
Fig. 3 is the schematic flow sheet of a step S600 for implementing example.
Wherein, reference：
10 forwarding engine modules
12 pretreatment units
20 nucleus modules
22 driver elements
24 first network interface cards
26 second network interface cards
28 core processing units
30 LAN interface
40 wan interfaces
Embodiment
The detailed features and advantage of the narration present invention in detail in embodiments below, its content is enough to make any to be familiar with
The technology contents that relevant art understands the present invention are simultaneously implemented according to this, and content according to disclosed by this specification, apply for a patent
Scope and schema, it is any to be familiar with relevant art and be readily understood upon the purpose and advantage of correlation of the invention.
The present invention provides the processing method of a kind of route device (routing device) and its network package.Wherein it route
Device can be used to perform the processing method of network package, to accelerate the speed for network package.
Please also refer to Figure 1A, it is the block schematic diagram of a route device for implementing example.Route device includes a forwarding
At least network that engine modules (Forwarding Engine, FWD) 10 and a nucleus module 20 are received with handling is sealed
Bag.Route device may also include the Wide Area Network of a Local Area Network (Local Area Network, LAN) interface 30 and one
(Wide Area Network, WAN) interface 40, with it is indivedual connect a Local Area Network domain (LAN domain, LAN domain) with
And a Wide Area Network domain (WAN domain, WAN domain).
Under a NAT mode, LAN domains can be considered as privately owned domain (privacy domain) by route device, and by WAN
Domain is considered as public domain (public domain).Route device can handle the network package received from LAN domains again will from
The package managed is sent to WAN domains, can also handle the network package that the network package received from WAN domains will be treated again
It is sent to LAN domains.
In more detail, route device at least can be with regard to physical layer (physical layer), media access control
(Medium Access Control layer, MAC layer) and Internet protocol suite layer (Internet Protocol
Layer, IP layer) processing network package；But also just transmission it can control agreement layer (Transmission Control on demand
Protocol layer, TCP layer) or the face layer such as application layer (application layer) processing network package.Therefore
With regard to different implementation examples, route device can reach the function of bridger (bridge), exchanger (switch) or router；And
, also can be as the high-order net such as gateway (gateway) or agent servo (proxy) if route device has the function of higher order
Network device.
In addition, route device can be provided with embedded instant operating system (Real-Time Operating System,
RTOS), such as VxWorks operating system.VxWorks are a kind of class Unix (Unix- with high efficiency and high stability
Like) operating system, it uses very elastic protocol stack (Protocol Stack) to handle network package.
Figure 1B is refer to, it is the block schematic diagram of the route device of another implementation example.Forwarding engine modules 10 can be wrapped
A pretreatment unit 12 is included, and performs by pretreatment unit 12 processing method of present networks package.Nucleus module 20 then may include
One driver element 22, the network interface card 26 of one first network interface card (Network Card, NIC) 24, one second and a core processing unit 28.
Driver element 22 can be used to and forward the reception or transmission of progress network package between engine modules 10.It is specific and
Speech, forwarding engine modules 10 can have a local end interface (local interface, do not illustrate), and pass through local end interface
And driver element 22 is linked up with nucleus module 20.But for nucleus module 20, local end interface can only be considered as driver element
22 are safeguarding the buffer (Buffer) of network package sending and receiving, and it is still to utilize LAN interface 30 or wan interface actually externally to link up
40。
First network interface card 24 may correspond to the LAN domains end of route device, and the second network interface card 26 then may correspond to WAN domains end,
And first network interface card 24 can each have different MAC Address from the second network interface card 26.In Figure 1B implementation example, the first network interface card 24
LAN interface 30 is may correspond to, the second network interface card 26 may correspond to wan interface 40, and LAN interface 30 and wan interface 40 can be respective
Correspondence one end slogan (port number).
Core processing unit 28 has the disposal ability powerful compared with pretreatment unit 12, and network package can be cut
(fragmentation), Internet protocol edition 4 (IPv4) is changed or network address translation study (Network with IPv6
Address Translation learning, NAT learning) etc. project relevant treatment.Traditionally all networks are sealed
Bag is all handled by core processing unit 28, but the processing method of present networks package can give the network package of part pretreatment list
Member 12 is handled, and to mitigate the burden of core processing unit 28, and promotes the treatment effeciency of overall route device.
Then Fig. 2 is refer to, it is the schematic flow sheet of the processing method of a network package for implementing example.
Route device receives network package (step S100) from a source interface, and wherein source interface can be LAN interface
30 or wan interface 40.In other words, network package can be passed by the incoming LAN domains of WAN domains or by LAN domains
Go out WAN domains.Pretreatment unit 12 is received after network package from source interface, can first read the shelves head (header) of network package
To judge whether network package meets a NAT package conditions (step S200).
Wherein NAT packages condition can include following condition a to e each points.
A. network package is IPv4 packages.
B. when network package uses TCP, network package is without synchronous flag (synchronized a flag, SYN
Flag), one flag (finish flag, FIN flag) or a replacement flag (RESET flag) are terminated.In other words, net
Network package is the control package merely to the data packet for transmitting data, rather than for network control.
C. network package does not use application layer gate (Application-level gateway or Application-
Layer gateway, ALG) service.
D. network package does not use world-wide web control message agreement (Internet Control Message
Protocol, ICMP).
E. network package is not cut at IP layers.
When network package does not meet NAT package conditions, that is, when not meeting any one of above-mentioned condition a to e, in advance
Processing unit 12 can make forwarding engine modules 10 that network package is transferred into nucleus module 20, be not inconsistent with being handled by nucleus module 20
Close the network package (step S300) of NAT package conditions.That is, nucleus module 20 can be received not from forwarding engine modules 10
Meet the network package of NAT package conditions, and handle the network package for not meeting NAT package conditions.
If the ineligible a of network package, expression network package is IPv6 packages；It may then need according to route device
Specification judges whether the conversion for needing to carry out network package IPv6 and NAT.
If the ineligible b of network package represents that network package is control package, if the ineligible c of network package is represented
Network package needs to carry out the processing related to ALG services, if the ineligible d of network package represents that network package needs progress
The processing related to ICMP.These situations are required for more complicated processing, therefore still give core processing unit 28 and handle.
If the ineligible e of network package, represent to be cut through by other network equipments before network package.In order to carry out
Network is controlled, it may be necessary to coordinated other network packages to be resequenced (reorder), recombinated (assembly) or again
Cut (re-fragmentation).Because these operations also need more complicated processing, therefore also give core processing unit 28
Processing.
Conversely, when network package meets NAT package conditions, that is, when all meeting above-mentioned condition a to e, pretreatment
Unit 12 can perform step S400, step S500 and step S600, or perform step S400, step S500 and step
S300.Among step S200, pretreatment unit 12, which is filtered out, to be only needed to carry out number of the NAT conversions without other complex process
According to package, subsequently NAT conversions voluntarily can be carried out to this data packet with step S400 to step S600.
If network package meets NAT package conditions, pretreatment unit 12 reads a transmission information of network package, and utilizes
Transmit the NAT mapping tables (step S400) of information inquiry one.And pretreatment unit 12 can determine whether whether have correspondence to pass in NAT mapping tables
Any map entries (step S500) of defeated information.
Implement example according to one, NAP mapping tables can be safeguarded by the core processing unit 28 of nucleus module 20, wherein having
There are an at least map entries (mapping entry).Each map entries may comprise corresponding transmission information and turn with a NAT
Photos and sending messages, and map entries can meet NAP tuples (NAP tuple) form.And NAT forwarding informations are with may include a NAT
Location and a nat port number.But NAT mapping tables can also note down more relevant informations on demand, with allow nucleus module 20 reach compared with
The network control function of high-order.
Pretreatment unit 12 can first read line (session) information of network package as transmission information, and line
The form of information can be 5 tuples (5-tupple), including a source IP addresses, a source port number, a communications protocol, a mesh
IP address and a destination slogan.And the transmission information that pretreatment unit 12 can obtain reading is converted into NAP tuples
Form, inquired about in NAT mapping tables, to determine whether the transmission information of any map entries and current network
The transmission information of package is identical.
When do not have in NAT mapping tables correspondence transmission information map entries when, represent this network package can not directly with
Existing information directly carries out NAT conversions, and needs first to carry out NAT study.By NAT learns and safeguarded NAT mapping tables institute
The processing needed more directly carries out NAT conversions and also wants complexity, therefore all can be performed by core processing unit 28.Therefore when NAT mappings
Do not have to perform step S300 during the map entries of correspondence transmission information in table, to handle this network package by nucleus module 20 yet.
Conversely, when have in NAT mapping tables correspondence transmission information map entries when, can directly make forwarding engine modules 10 according to
The shelves head of network package, and the interface (step of a mesh of setting network package are updated according to the NAT forwarding informations of corresponding map entries
Rapid S600).In other words, NAT conversions voluntarily can be carried out to this network package by pretreatment unit 12.Wherein purpose interface can
To be LAN interface 30 or wan interface 40, and source interface is different from purpose interface.
Fig. 3 is refer to, it is the schematic flow sheet of a step S600 for implementing example.
Found in NAT mapping tables after the map entries corresponding to transmission information, pretreatment unit 12 can first judge source
Interface is LAN interface 30 or wan interface 40 (step S610).
When source interface is LAN interface 30, following steps S620 to step S640 can perform.Pretreatment unit 12 can be according to
Source IP addresses, source port number and a verification and (checksum) of network package are updated according to corresponding NAT forwarding informations
(step S620).Pretreatment unit 12 can replace source IP addresses of the network package in IP layers of shelves head with NAT addresses, and
Source port number in shelves head is replaced with nat port number.And pretreatment unit 12 recalculates correspondence according to the shelves head more corrected one's mistakes
The verification of shelves head and, to avoid network package because of verification and not corresponding and be considered wrong by the follow-up network equipment with shelves head
Package.
In addition, pretreatment unit 12 can update a timer (timer) for corresponding map entries in NAT mapping tables
(step S630).Each map entries can be set with a timer in NAT mapping tables, to ensure the timeliness of map entries
Property.The timer of map entries can be used to be pretreated unit 12 or core processing unit during NAT conversions in this map entries
28 update.If having the technology of timer more than a predetermined threshold value, represent that map entries all do not have within one section of scheduled period
It is used to, then this map entries can be removed by core processing unit 28.
After the shelves head for having updated network package, pretreatment unit 12 can setting network package purpose interface be wan interface
40 (step S640), network package is sent to WAN domains from wan interface 40.
When source interface is wan interface 40, pretreatment unit 12 then can perform following steps S650 to step S670.In advance
Processing unit 12 can update purpose IP address, destination slogan and the verification of network package according to corresponding NAT forwarding informations
(step S650), and update the timer (step S660) of corresponding map entries in NAT mapping tables.Pretreatment unit 12 can
With purpose of the IP address substitution network package in IP layers of shelves head to inquire about correspondence LAN domains end in obtained map entries
The port numbers at correspondence LAN domains end replace the destination slogan in shelves head in IP address, and the map entries obtained with inquiry.
And pretreatment unit 12 can be recalculated according to the shelves head more corrected one's mistakes correspondence shelves head verification and, and update and inquire about
The timer of the map entries arrived.Then pretreatment unit 12 can setting network package purpose interface be the (step of LAN interface 30
S670), network package is sent to LAN domains from LAN interface 30.
In summary, the processing method of route device and its network package can filter out only need to carry out NAT conversions and
Had the network package of corresponding NAT forwarding informations in NAT mapping tables, then by forwarding engine modules pretreatment unit from
Row carries out NAT conversions to this network package, and is not communicated to nucleus module processing.It is this to only need to carry out NAT according to statistics
The data packet of conversion constitutes about overall fifty percent to sixty percent, thus pretreatment unit can be disposed with simple running it is more than half
Network package.Consequently, it is possible to which the burden of core processing unit can be mitigated, and package delay is greatly reduced, promotes overall road
By the treatment effeciency of device.
Certainly, the present invention can also have other various embodiments, ripe in the case of without departing substantially from spirit of the invention and its essence
Various corresponding changes and deformation, but these corresponding changes and change ought can be made according to the present invention by knowing those skilled in the art
Shape should all belong to the protection domain of appended claims of the invention.
Claims (14)
1. a kind of processing method of network package a, it is adaptable to routing device, the routing device include a forwarding engine modules with
And a nucleus module, it is characterised in that the processing method of the network package includes：
A network package is received from a source interface；
Judge whether the network package meets a network address translation NAT package conditions；And
When the network package meets the NAT package conditions, following steps are performed：
A transmission information of the network package is read, and utilizes the NAT mapping tables of transmission information inquiry one；And
When there are the map entries to information should be transmitted in the NAT mapping tables, the forwarding engine modules are made according to corresponding
One NAT forwarding informations of the map entries update the shelves head of the network package, and set the interface of a mesh of the network package,
Wherein, when the network package does not meet the NAT package conditions, the forwarding engine modules are made to transfer to the network package
The nucleus module, to handle the network package by the nucleus module,
When any map entries not to information should be transmitted in the NAT mapping tables, make the forwarding engine modules should
Network package transfers to the nucleus module, to handle the network package by the nucleus module, and
The NAT mapping tables are safeguarded by the nucleus module.
2. the processing method of network package according to claim 1, it is characterised in that the NAT packages condition is simultaneously full
Foot：
The network package is Internet protocol edition 4 package；
When the network package uses transmission control protocol, the network package without a synchronous flag, one terminate flag or
One resets flag；
The network package does not use application layer gate to service；
The network package does not use world-wide web control message agreement；And
The network package is not cut in Internet Protocol.
3. the processing method of network package according to claim 1, it is characterised in that the transport packet includes a source IP
Address, a source port number, a communications protocol, a purpose IP address and a destination slogan.
4. the processing method of network package according to claim 3, it is characterised in that the source interface is a Local Area Network
LAN interface or a Wide Area Network wan interface, the purpose interface be a Local Area Network LAN interface or a Wide Area Network wan interface,
And the source interface is different from the purpose interface.
5. the processing method of network package according to claim 4, it is characterised in that this makes the forwarding engine modules foundation
The NAT forwarding informations of the corresponding map entries update the shelves head of the network package, and set the purpose of the network package
The step of interface, includes：
When the source interface is the LAN interface, following steps are performed：
The source IP addresses, the source port number and a school for the network package is updated according to the corresponding NAT forwarding informations
Test and；
Update a timer of the corresponding map entries in the NAT mapping tables；And
The purpose interface of the network package is set as the wan interface.
6. the processing method of network package according to claim 4, it is characterised in that this makes the forwarding engine modules foundation
The NAT forwarding informations of the corresponding map entries update the shelves head of the network package, and set the purpose of the network package
The step of interface, separately includes：
When the source interface is the wan interface, following steps are performed：
Purpose IP address, the destination slogan and a school of the network package are updated according to the corresponding NAT forwarding informations
Test and；
Update a timer of the corresponding map entries in the NAT mapping tables；And
The purpose interface of the network package is set as the LAN interface.
7. the processing method of network package according to claim 1, it is characterised in that the NAT forwarding informations include a NAT
Address and a nat port number.
8. a kind of route device, it is characterised in that including：
One forwarding engine modules, to perform following steps：
A network package is received from a source interface；
Judge whether the network package meets a network address translation NAT package conditions；And
When the network package meets the NAT package conditions, following steps are performed：
A transmission information of the network package is read, and utilizes the NAT mapping tables of transmission information inquiry one；
When having the map entries to information should be transmitted in the NAT mapping tables, the NAT according to the corresponding map entries
Forwarding information updates the shelves head of the network package, and sets the interface of a mesh of the network package；And
When the network package does not meet the NAT package conditions, the network package is transferred；And
One nucleus module, the network package of the NAT package conditions is not met to be received from the forwarding engine modules, and is handled
The net for not having corresponding any map entries in the network package of the NAT package conditions, or the NAT mapping tables is not met
Network package,
Wherein, the NAT mapping tables are safeguarded by the nucleus module.
9. route device according to claim 8, it is characterised in that the NAT packages condition is satisfaction simultaneously：
The network package is Internet protocol edition 4 package；
When the network package uses transmission control protocol, the network package without a synchronous flag, one terminate flag or
One resets flag；
The network package does not use application layer gate to service；
The network package does not use world-wide web control message agreement；And
The network package is not cut at IP layers.
10. route device according to claim 8, it is characterised in that the transport packet includes a source IP addresses, one
Source port number, a communications protocol, a purpose IP address and a destination slogan.
11. route device according to claim 10, it is characterised in that separately include：
One Local Area Network LAN interface；And
One Wide Area Network wan interface；
Wherein the source interface be the LAN interface or the wan interface, the purpose interface be the LAN interface or the wan interface, and
The source interface is different from the purpose interface.
12. route device according to claim 11, it is characterised in that when the source interface is the LAN interface, this turn
Send out engine modules and perform following steps：
The source IP addresses, the source port number and a school for the network package is updated according to the corresponding NAT forwarding informations
Test and；
Update a timer of the corresponding map entries in the NAT mapping tables；And
The purpose interface of the network package is set as the wan interface.
13. route device according to claim 11, it is characterised in that when the source interface is the wan interface, this turn
Send out engine modules and perform following steps：
Purpose IP address, the destination slogan and a school of the network package are updated according to the corresponding NAT forwarding informations
Test and；
Update a timer of the corresponding map entries in the NAT mapping tables；And
The purpose interface of the network package is set as the LAN interface.
14. route device according to claim 8, it is characterised in that the NAT forwarding informations include a NAT addresses and
Nat port No. one.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI300301B (en) * | 2005-12-23 | 2008-08-21 | Hon Hai Prec Ind Co Ltd | Network address translation device and method for forwarding packets thereof |
| CN101909041A (en) * | 2009-06-03 | 2010-12-08 | 中国移动通信集团公司 | Method and system for host with IPv4 application to communicate through IPv6 network |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI220344B (en) * | 2002-10-23 | 2004-08-11 | Winbond Electronics Corp | Manufacture and method for accelerating network address translation |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI300301B (en) * | 2005-12-23 | 2008-08-21 | Hon Hai Prec Ind Co Ltd | Network address translation device and method for forwarding packets thereof |
| CN101909041A (en) * | 2009-06-03 | 2010-12-08 | 中国移动通信集团公司 | Method and system for host with IPv4 application to communicate through IPv6 network |
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