CN100454900C - Method and system for quick responding IP banding message - Google Patents
Method and system for quick responding IP banding message Download PDFInfo
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- CN100454900C CN100454900C CNB2006100333823A CN200610033382A CN100454900C CN 100454900 C CN100454900 C CN 100454900C CN B2006100333823 A CNB2006100333823 A CN B2006100333823A CN 200610033382 A CN200610033382 A CN 200610033382A CN 100454900 C CN100454900 C CN 100454900C
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Abstract
The present invention relates to a method for rapidly responding an IP fragment message, which comprises the steps that an IP sending end sends the IP fragment message; an IP destination end receives the IP fragment message, and judges whether the IP fragment message needs a direct response; when the IP fragment message needs the direct response, the IP destination end immediately sends response information to the IP sending end on a network layer; when the IP fragment message does not need the direct response, the IP destination end recombines the IP fragment message. The response time to the IP fragment message is shortened for satisfying the very high real-time requirement of response processing by the response processing of the IP fragment message. Because the IP sending end is not responded after recombination on the IP destination end, the recombination overhead of the response time is reduced, and simultaneously, the possibility of attack suffering caused by establishing a recombination queue is reduced.
Description
Technical field
The present invention relates to the message treatment technology in the network service, relate in particular to the method and system of quick responding IP banding message.
Background technology
When transmitting data in network, physical network layer generally will limit the maximum length of each transmission Frame.Whenever IP (Internet Protocol, procotol) layer receive IP message that portion will send the time, judgement sends data to local which interface, and inquires about this interface to obtain its MTU (Maximum Transmission Unit, MTU).At the IP layer MTU of receiving interface is compared with needing transmission IP message length, as required the IP message is carried out burst, split into several IP fragmentation messages, that is: remove last a slice message, the size of other fragment message all reaches the transmittability of MTU.
After all IP message fragments that constitute complete IP message reached, the purpose interface just re-assemblied, that is: reorganization.Re-assembly by the IP layer of destination and finish, its objective is that making the burst and the process that re-assemblies is transparent to transport layer.
The data that comprise in the IP fragmentation heading provide enough information for burst and reorganization:
For example the IP fragmentation message structure of IPV4 (Internet Protocol version 4, the four generation procotol) is as shown in Figure 1: preceding 20 bytes are the basic header of IP, wherein below field be used for the sign, sign, sheet skew etc. of burst regrouping process.
For the every IP fragmentation message that transmitting terminal sends, its identification field all comprises a unique value, and this value is copied to when message fragment in the every IP fragmentation message.
Attribute field represents that with one of them bit (bit) except last a slice, other IP fragmentation messages all will put 1 to this bit needing the IP message of burst to be divided into more sheet.
The sheet offset field refers to, the position at this sheet IP fragmentation message skew initial IP start of heading place.
After the IP message was by burst, the total length value of every IP fragmentation message will change the length value of this sheet message into.
At last, there is a bit to be called " not burst " position in the attribute field, if this bit is put 1, IP will not carry out burst to datagram, if this packet loss, then send an ICMP (InternetControl Message Protocol, network control message agreement) error message and give the IP message source.
After the IP message was by burst, each sheet all became an IP fragmentation message, and the basic header of IP of oneself is arranged, and when selecting route with other IP fragmentation messages independences.Might be out-of-sequence when the IP fragmentation message arrives the IP destination, but in the IP stem, there is enough information to allow receiving terminal can correctly assemble these IP fragmentation messages.
The burst regrouping process of message is as shown in Figure 2: the IP destination is received the IP fragmentation message, according to the identification field of the basic header of IP, is suspended in the reorganization formation, waits for all the other fragment messages.When collecting all IP fragmentation messages in the formation, just begin message to be re-assemblied and be an original IP message, and give transport layer process according to the sign of each fragment message and sheet offset field in reorganization.
Prior art, may not satisfy the demands in the exigent business of the real-time of replying processing for some.
For example: when the IP destination needs response fast professional, the IP destination is to IP message fragment reorganization, treat that reorganization is finished after, the initial IP message after the assembling remake replys processing, in reorganization, take a large amount of time like this, can not satisfy the demand of quick response.Particularly the IP destination adopts distributed frame, and different IP fragmentation messages may arrive the distinct interface plate of IP destination, and reorganization need be done between plate and transmit, and has further influenced the real-time of replying processing.
For example: in the middle as shown in Figure 3 distributed frame, the burst regrouping process of message.The IP destination is made of interface board 1, interface board 2 and master control borad, first IP fragmentation message, the 3rd IP fragmentation message arrive 2, the second IP fragmentation messages of interface board and arrive interface board 1, in order to realize reorganization, all IP fragmentation messages are delivered to master control borad, concentrate and do reorganization.In this case, except reorganization expends time in, transmit between plate and also expend certain hour.
Summary of the invention
The problem to be solved in the present invention is to provide the method and system of quick responding IP banding message, shortens the response time to the IP fragmentation message, satisfies the requirement of real-time.
For realizing the above object, technical solution of the present invention is achieved in that
A kind of method of quick responding IP banding message comprises:
The IP transmitting terminal sends the IP fragmentation message;
The IP destination receives described IP fragmentation message, judges whether described IP fragmentation message needs direct response, if described IP destination sends response message to described IP transmitting terminal immediately in network layer; Otherwise, the described IP destination described IP fragmentation message of recombinating.
Described IP fragmentation message is: the IP fragmentation message of reserved field or have the IP fragmentation message of protocol type information in this heading of expansion base.
Described IP destination receives described IP fragmentation message and also comprises step afterwards:
The IP destination is resolved described IP fragmentation message, obtains the value or the protocol type information of described reserved field.
Whether directly reserved field uses the response of designated value sign in the described amplifying message head;
Described protocol type information comprises: network control messaging protocol, transmission control protocol or User Datagram Protoco (UDP).
Describedly send response message immediately in network layer and before described IP transmitting terminal, also comprise step: revise the information in this IP fragmentation message.
Information in this IP fragmentation message of described modification specifically comprises step:
Directly exchange the source address and the destination address of described IP fragmentation message;
The segmental identification field of revising in the described IP fragmentation message basic header is local segmental identification, wherein, uses the linear function algorithm, and the segmental identification of basic header in the described IP fragmentation message is calculated local segmental identification;
Adjust described IP fragmentation message verification and.
This IP fragmentation message of described modification specifically comprises step:
The life span TTL that revises basic header in the described IP fragmentation message is the TTL of appointment;
For first IP fragmentation message, revise the load content in the described IP fragmentation message;
For non-first IP fragmentation message, judge whether needs modification IP load content according to applicable cases, if need to revise, then the load of the IP in described IP fragmentation message content is made amendment.
Described response message is amended IP fragmentation message information.
The described IP fragmentation message that described IP destination directly responds for needs according to the burst condition that sends message, also carries out the secondary burst to described IP fragmentation message.
The present invention also provides a kind of system of quick responding IP banding message, comprising: the IP transmitting terminal: be used to send the IP fragmentation message; The IP destination: be connected with described IP transmitting terminal, receive described IP fragmentation message, and the IP fragmentation message of recombinating received;
Described IP destination also comprises,
Message processing module (MPM): resolve described IP fragmentation message, judge whether this IP fragmentation message needs direct response;
Respond module: be connected with message processing module (MPM), when described message processing module (MPM) directly responds according to these IP fragmentation message needs of analysis judgment to described IP fragmentation message, send response message immediately to the IP transmitting terminal in network layer.
Describedly judge whether this IP fragmentation message needs directly response for to judge by value or the protocol type information of obtaining described reserved field.
Described respond module specifically comprises:
Message is revised the unit: the source address and the destination address that directly exchange described IP fragmentation message, the segmental identification field of revising basic header in the described IP fragmentation message is local segmental identification, adjust described IP fragmentation message verification and, the TTL that revises the basic header of described IP fragmentation message is the TTL of appointment, revises the load content in the described IP fragmentation message;
Message loopback cell: receive amended IP fragmentation message, send and revise back IP fragmentation message to the IP transmitting terminal.
The present invention handles by the response to the IP fragmentation message, has improved the response time to the IP fragmentation message, satisfies the exigent requirement of real-time that response is handled; Owing to when destination does not need to wait for that all fragment messages all reach, do not respond again, thereby reduce the reorganization expense of system; Simultaneously at the destination of network by real-time response transmitting terminal, and because of setting up the possibility that the formation of recombinating is attacked.
Description of drawings
The IP fragmentation message structure of IPV4 in Fig. 1 prior art.
The process of IP message fragment reorganization in Fig. 2 prior art.
IP fragmentation message regrouping process in the distributed frame in Fig. 3 prior art.
Quick responding IP banding message flow chart among Fig. 4 the present invention.
Another quick responding IP banding message flow chart among Fig. 5 the present invention.
The structured flowchart of the responding system of IP fragmentation message among Fig. 6 the present invention.
The structured flowchart of respond module among Fig. 7 the present invention.
Embodiment
In the exigent business of the real-time of replying processing, after the network layer of IP destination waits for that all IP fragmentation messages arrive, transport layer responses to the IP message of reorganization again, may be discontented with the demand of sufficient real-time, particularly the IP destination adopts distributed frame, different bursts may arrive the distinct interface plate of destination, and reorganization need be done between plate and transmit, and has further influenced the real-time of replying processing.
The invention provides a kind of method of quick responding IP banding message, its core comprises: the IP destination receives the IP fragmentation message, determine that described IP fragmentation message needs directly response, then send IP fragmentation message response information immediately to the IP transmitting terminal, improved the real-time of response in network layer.
Shown in Fig. 1,4, be IPV4 pack arrangement and the used step of using in the concrete principle in IPV4 to the response of IP fragmentation message:
When the IP fragmentation message is first fragment message, comprise in the IP load content having message protocol information in its message, be used to determine whether respond immediately the IP fragmentation message.
For example: messages such as TCP (Transfer Control Protocol, transmission control protocol), ICMP need directly to respond the IP transmitting terminal; And do not need directly to respond the IP transmitting terminal for UDP messages such as (User Datagram Protocol, User Datagram Protoco (UDP)).
Described IP fragmentation message uses and keeps the sign whether the position conduct responds the IP transmitting terminal immediately in the extension flag position, as shown in Figure 1, wherein use in the 3 bit flag positions among the above-mentioned figure to keep the position, expand this reservations position and be: when the value that keeps the position is 0, response again after expression IP fragmentation message need be recombinated; When the value that keeps the position was 1, then expression did not need reorganization and the IP transmitting terminal that need make an immediate response; In the time of also can work as simultaneously the value that keeps the position and be 1, response again after expression IP fragmentation message need be recombinated; When the value that keeps the position was 0, then expression did not need reorganization and the IP transmitting terminal that need make an immediate response.
After step 402, IP destination receive the IP fragmentation message, judge whether this IP fragmentation message needs direct response, and concrete grammar comprises:
A) according to the information of carrying in the basic header of IP, determine the bearing protocol type, next header (Next Header) territory in the basic header of agreement (Protocol) territory in the basic header of IPv4 or IPv6 (Internet Protocol Version 6, the six generation procotol) for example.
B),, determine whether directly to respond this fragment message owing to wherein have protocol type information for first IP fragmentation message.
C) when the IP fragmentation message be non-first IP fragmentation message, resolve IP fragmentation, obtain indicating the value of the reserved field in the position, to identify this sheet fragment message whether otherwise through reorganization and response immediately.
If step 403 is determined the not directly response of this burst, then the IP destination is stored this fragment message, waits for reorganization.
If step 404 determines that this burst directly responds, directly revise fragment message content in response.
A) directly exchange the source and destination address of the IP fragmentation message that receives, or specify other source addresses, thereby revise the source address and the destination address of the basic header of IP.
B) TTL of the basic header of modification IP specifies required TTL.
C) the segmental identification field of the basic header of modification IP is local segmental identification, for example uses existing algorithm: the linear function algorithm, the segmental identification of butt joint receiving literary composition calculates the segmental identification of this locality.
D) also may revise the basic header field of other IP if desired, as type service field etc.
E) for first IP fragmentation message, owing to wherein also comprise: the part IP content of load, for example TCP/UDP except that IP content or application data etc. can be revised the corresponding IP content of loading.
F) for non-first IP fragmentation message, whether revise IP load content, depend on concrete application, for example: ping uses to order, does not need to revise; And for the application of ordering tracert, then need to revise, if can discern the content that the IP fragmentation message carries, also can revise.
G) to amended responding IP banding message adjust verification and, and do not need the whole stem of IP is recomputated.
According to content before revising and revise verification that back content adjustment makes new advances and, revise the transport layer content may also need to adjust verification and.
After step 405, IP fragmentation message were revised, the IP destination was directly responded and is given the IP transmitting terminal.
The IP destination is at the network layer IP transmitting terminal that makes an immediate response.
The IP transmitting terminal can also can directly return to the IP destination again according to standard procedure to the response message processing of recombinating.
Among the present invention, handle for improving reliability, fragment message also can be chosen in destination the IP fragmentation message is done the reorganization processing when directly responding.
Among the present invention, at the fragment message that the IP destination is directly responded, be to satisfy the burst condition of IP destination simultaneously, and continue burst: the segmental identification field of directly using the preceding fragment message of secondary burst the transmission message, adjust burst flag bit and sheet offset field simultaneously, and total length field.
Foregoing description mainly is example with IPv4, because the similitude of IPv6 and IPv4, the present invention is equally applicable to the burst of IPv6 and replys processing.
Specify the present invention's response below and have specific implementation process of ICMP protocol of I PV4 fragment message:
Step 4001, IP transmitting terminal send fragment message.
After step 4002, IP destination receive this IP fragmentation message, judge whether this IP fragmentation message needs direct response.
A) be judged as the message of IPV4 by the protocol domain in the fragment message head.
B) protocol type information in the parsing fragment message head obtains ICMP, determines that this message needs directly response.
Step 4003, directly revise the response contents of fragment message.
A) the direct source and destination address that exchanges the IP fragmentation message that receives.
B) revise the TTL of the basic header of IP, specify required TTL, can be 1 second, 2 seconds etc.
C) the segmental identification field of revising the basic header of IP is local segmental identification, goes out to receive the segmental identification of this locality of the segmental identification of message by algorithm computation.
D) revise the basic header field of other IP, 8 type of service field as shown in Figure 1 etc.
E) to amended responding IP banding message adjust verification and, and do not need the whole stem of IP is recomputated.
After step 4004, IP fragmentation message were revised, the IP destination was directly responded and is given the IP transmitting terminal.
The IP destination is at the network layer IP transmitting terminal that makes an immediate response.
A kind of method of quick responding IP banding message is provided among the present invention in addition, and the IP destination receives the IP fragmentation message that the IP transmitting terminal sends, at the network layer IP transmitting terminal that makes an immediate response.
Below in conjunction with accompanying drawing 5, specify the step of IPV4 message response:
When the IP fragmentation message is first fragment message, comprise in its message that IP load content comprises message protocol information, be used for determining to send immediately IP fragmentation message response information to the IP transmitting terminal.
For example: messages such as TCP, ICMP need directly to respond the IP transmitting terminal.
Whether the reserved field conduct responds the sign of IP transmitting terminal immediately in the described IP fragmentation message use extension flag position, as shown in Figure 1, wherein use and keep the position in the 3 bit flag positions among the above-mentioned figure, expanding this reservation position is: using the value that keeps the position is 1, and then expression does not need reorganization and need send response message immediately to the IP transmitting terminal; Also can specify simultaneously the value that keeps the position as required is 0 o'clock, and expression IP fragmentation message does not need to send response message to the IP transmitting terminal in network layer immediately again after the reorganization.
According to the information of carrying in the basic header of IP, determine the bearing protocol type, for example the protocol domain in the basic header of IPv4 or next header field in the basic header of IPv6.
A) directly exchange the source and destination address of the IP fragmentation message that receives, or specify other source addresses, thereby revise the source address and the destination address of the basic header of IP.
B) TTL of the basic header of modification IP specifies required TTL.
C) the segmental identification field of the basic header of modification IP is local segmental identification, uses existing algorithm, for example: linear function algorithm, the segmental identification of this locality of the segmental identification of butt joint receiving literary composition.
D) also may revise the basic header field of other IP if desired, as type service field etc.
E) for first IP fragmentation message, owing to wherein also comprise: the part IP content of load, for example TCP/UDP except that IP content or application data etc. can be revised the corresponding IP content of loading.
F) for non-first IP fragmentation message, whether revise IP load content, depend on concrete application, for example: ping uses to order, does not need to revise; And for the application of ordering tracert, then need to revise, if can discern the content that the IP fragmentation message carries, also can revise.
G) to amended responding IP banding message adjust verification and, and do not need the whole stem of IP is recomputated.
After step 504, IP fragmentation message were revised, the IP destination was directly responded and is given the IP transmitting terminal.
The IP destination is at the network layer IP transmitting terminal that makes an immediate response.
Among the present invention, handle for improving reliability, the IP destination also can be selected the IP fragmentation message reorganization that receives is handled in the IP transmitting terminal of directly responding.
Among the present invention, at the fragment message that the IP destination is directly responded, be to satisfy the burst condition of IP destination simultaneously, and continue burst: the segmental identification field of directly using the preceding fragment message of secondary burst the transmission message, adjust burst flag bit and sheet offset field simultaneously, and total length field.
Foregoing description mainly is example with IPv4, because the similitude of IPv6 and IPv4, the present invention is equally applicable to the burst of IPv6 and replys processing.
A kind of responding system of IP fragmentation message comprises: the IP transmitting terminal: be used to send the IP fragmentation message; IP destination: be connected with described IP transmitting terminal, receive described IP fragmentation message, reconstructed file; Described IP destination also comprises,
Message processing module (MPM): resolve described IP fragmentation message, judge whether this IP fragmentation message needs direct response;
Respond module: be connected with message processing module (MPM), need directly to respond, send response message immediately to the IP transmitting terminal in network layer when judging.
Describedly judge whether this IP fragmentation message needs directly to respond to judge by the value or the transport layer protocol type information that obtain described reserved field.
Described respond module comprises:
Message is revised the unit: the source address and the destination address that directly exchange described IP fragmentation message, the segmental identification field of revising basic header in the described IP fragmentation message is local segmental identification, adjust described IP fragmentation message verification and, the TTL that revises the basic header of described IP fragmentation message is the TTL of appointment, revises the load content in the described IP fragmentation message;
Message loopback cell: receive amended IP fragmentation message, send and revise back IP fragmentation message to the IP transmitting terminal.
Technique effect of the present invention: for handling, shortened response time, satisfied the exigent requirement of real-time that response is handled to the IP fragmentation message by response to the IP fragmentation message; Owing to after the reorganization of IP destination, do not respond the IP transmitting terminal again, reduce the reorganization expense of response time; Reduced simultaneously because of setting up the possibility that the reorganization formation is attacked.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (12)
1, a kind of method of quick responding IP banding message is characterized in that, comprising:
The IP transmitting terminal sends the IP fragmentation message;
The IP destination receives described IP fragmentation message, judges whether described IP fragmentation message needs direct response, if described IP destination sends response message to described IP transmitting terminal immediately in network layer; Otherwise, the described IP destination described IP fragmentation message of recombinating.
2, method according to claim 1 is characterized in that, described IP fragmentation message is: the IP fragmentation message of reserved field or have the IP fragmentation message of protocol type information in this heading of expansion base.
3, method according to claim 2 is characterized in that, described IP destination receives described IP fragmentation message and also comprises step afterwards:
The IP destination is resolved described IP fragmentation message, obtains the value or the protocol type information of described reserved field.
4, method according to claim 3 is characterized in that, whether directly reserved field uses the response of designated value sign in the described amplifying message head; Described protocol type information comprises: network control messaging protocol, transmission control protocol or User Datagram Protoco (UDP).
5, method according to claim 1 is characterized in that, describedly sends response message immediately in network layer also comprised step before described IP transmitting terminal: revise the information in this IP fragmentation message.
6, method according to claim 5 is characterized in that, the information in this IP fragmentation message of described modification specifically comprises step:
Directly exchange the source address and the destination address of described IP fragmentation message;
The segmental identification field of revising in the described IP fragmentation message basic header is local segmental identification, wherein, uses the linear function algorithm, and the segmental identification of basic header in the described IP fragmentation message is calculated local segmental identification;
Adjust described IP fragmentation message verification and.
7, method according to claim 5 is characterized in that, this IP fragmentation message of described modification specifically comprises step:
The life span TTL that revises basic header in the described IP fragmentation message is the TTL of appointment;
For first IP fragmentation message, revise the load content in the described IP fragmentation message;
For non-first IP fragmentation message, judge whether needs modification IP load content according to applicable cases, if need to revise, then the load of the IP in described IP fragmentation message content is made amendment.
8, method according to claim 5 is characterized in that, described response message is amended IP fragmentation message information.
According to any described method in the claim 1 to 8, it is characterized in that 9, the described IP fragmentation message that described IP destination directly responds for needs according to the burst condition that sends message, also carries out the secondary burst to described IP fragmentation message.
10, a kind of system of quick responding IP banding message comprises: the IP transmitting terminal: be used to send the IP fragmentation message; The IP destination: be connected with described IP transmitting terminal, receive described IP fragmentation message, and the IP fragmentation message of recombinating received; It is characterized in that described IP destination also comprises,
Message processing module (MPM): resolve described IP fragmentation message, judge whether this IP fragmentation message needs direct response;
Respond module: be connected with message processing module (MPM), when described message processing module (MPM) directly responds according to these IP fragmentation message needs of analysis judgment to described IP fragmentation message, send response message immediately to the IP transmitting terminal in network layer.
11, system according to claim 10 is characterized in that, describedly judges whether this IP fragmentation message needs directly response for to judge by value or the protocol type information of obtaining reserved field in this heading of expansion base.
12, system according to claim 11 is characterized in that, described respond module specifically comprises:
Message is revised the unit: the source address and the destination address that directly exchange described IP fragmentation message, the segmental identification field of revising basic header in the described IP fragmentation message is local segmental identification, adjust described IP fragmentation message verification and, the TTL that revises the basic header of described IP fragmentation message is the TTL of appointment, revises the load content in the described IP fragmentation message;
Message loopback cell: receive amended IP fragmentation message, send and revise back IP fragmentation message to the IP transmitting terminal.
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| WO2012083482A1 (en) * | 2010-12-21 | 2012-06-28 | Telefonaktiebolaget L M Ericsson (Publ) | An improvement on ip fragmentation in gtp tunnel |
| EP2493131A1 (en) | 2011-02-28 | 2012-08-29 | British Telecommunications Public Limited Company | Obtaining information from data items |
| CN103595661B (en) * | 2013-11-28 | 2017-05-10 | 新华三技术有限公司 | Message fragmentation restructuring method and device |
| CN105099992B (en) * | 2014-04-29 | 2018-07-24 | 杭州迪普科技股份有限公司 | A kind of message modification device and method |
| CN113452646B (en) * | 2020-03-24 | 2022-09-13 | 北京新能源汽车股份有限公司 | Method and device for transmitting data by user datagram protocol and electric automobile |
| CN114915589B (en) * | 2021-02-10 | 2024-06-04 | 华为技术有限公司 | Message transmission method and device |
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| CN1494274A (en) * | 2002-10-31 | 2004-05-05 | ����ͨѶ�ɷ�����˾ | Method of realizing IP message partition and recombination based on network processor |
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| CN1536832A (en) * | 2003-04-04 | 2004-10-13 | 华为技术有限公司 | Method for processing extra-long message in two-layer virtual special-purpose network |
| US6891855B2 (en) * | 2000-07-27 | 2005-05-10 | Corrigent Systems, Ltd. | Dynamic packet fragmentation |
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| US6891855B2 (en) * | 2000-07-27 | 2005-05-10 | Corrigent Systems, Ltd. | Dynamic packet fragmentation |
| CN1494274A (en) * | 2002-10-31 | 2004-05-05 | ����ͨѶ�ɷ�����˾ | Method of realizing IP message partition and recombination based on network processor |
| CN1509025A (en) * | 2002-12-18 | 2004-06-30 | ��Ϊ��������˾ | Method for realizing message partition packet |
| US20040184455A1 (en) * | 2003-03-19 | 2004-09-23 | Institute For Information Industry | System and method used by a gateway for processing fragmented IP packets from a private network |
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