CN104579948A - Method and device for fragmenting message - Google Patents
Method and device for fragmenting message Download PDFInfo
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- CN104579948A CN104579948A CN201310522857.5A CN201310522857A CN104579948A CN 104579948 A CN104579948 A CN 104579948A CN 201310522857 A CN201310522857 A CN 201310522857A CN 104579948 A CN104579948 A CN 104579948A
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Abstract
The invention provides a method and a device for fragmenting a message. By adopting a received data message processed by FPGA, a fragmenting information table entry is stored in an on-chip resource or an external memory of GPGA. The method comprises the following steps: comparing a characteristic value of the received fragmenting message with a characteristic value stored in the fragmenting information table entry; further judging whether the fragmenting message is a primary message or not if a consistent comparison result is acquired; storing primary message information into the fragmenting information table entry if the message is the primary message and sending the primary message; processing a subsequent fragmenting message which exists in the primary message according to a processing way of the received primary message and sending the processed subsequent fragmenting message; judging whether the primary message information of the subsequent fragmenting message exists or not if the message is the subsequent fragmenting message; processing in a processing way of the primary message if the primary message information of the subsequent fragmenting message exists, and sending the processed subsequent fragmenting message; storing the subsequent fragmenting message if the primary message information of the subsequent fragmenting message does not exist.
Description
Technical field
The present invention relates to network communication field, particularly relate to a kind of message fragment processing method and device.
Background technology
At present, along with developing rapidly of the Internet, the number of users of access the Internet constantly increases, and its business used is numerous, for service and the agreement also more and more refinement of miscellaneous service.The closed-in construction network equipment of high density, high forwarding performance is more and more used to Internet data transmission field.
In data transmission procedure, when message arrives a network equipment port, find that maximum transfer unit MTU (Maximum Transmission Unit) is less than IP package, just need to carry out burst to message, then the IP package of burst can arrive destination separately, and recombinates in destination.Traditional packet filtering does not process all IP message fragments, but only carries out matching treatment to first (first) fragment message, and successive fragment message is let pass without exception.Such network attack person may construct successive fragment message, thus utilizes successive fragment message to carry out flow attacking, just brings potential safety hazard.In order to evade this potential safety hazard, the existing network equipment uses the CPU of master control or the coupling action of network controller to first message to carry out record for the process of fragment message mostly.If do not find first message information, then buffer memory is carried out to the subsequent packet received, until process according to the subsequent packet of first message information to buffer memory after receiving first message, to ensure that successive fragment message and first message carry out same process.Successive fragment packet out-ordering is not but received always to the situation of first message, the network equipment carries out buffer memory, is cached to certain hour, if still do not receive first message, thinks first packet loss of this follow-up fragment message.If the network equipment in bypass mode, by the successive fragment packet loss in buffer memory, if under transparent mode, directly the successive fragment message repeating of buffer memory is not carried out matching treatment.
For the closed-in construction network equipment of existing high density, high forwarding performance, use the CPU of master control or network controller to process the process of the fragment message of the network equipment, there is the problem that performance is inadequate.By the programming to CPU or network controller, utilize internal memory to come buffer memory successive fragment message and first fragment message information, its processing mode is not efficient.In sum, still there is technical problem urgently to be resolved hurrily in prior art.
Summary of the invention
In view of this, the object of this invention is to provide a kind of message fragment processing method and device, it can support the closed-in construction network equipment of high density, high forwarding performance, and realizes high handling property, message fragment process efficiently.
For achieving the above object, the invention provides technical scheme as follows:
A kind of message fragment processing method, adopt the data message that FPGA process receives, burst information list item to be stored in described FPGA sheet in resource or external internal memory, and the content of described burst information list item comprises characteristic value and the first message information of the fragment message of storage.
Described method comprises:
Steps A, compares the characteristic value of the fragment message of reception and the characteristic value of described burst information list item storage.
Step B, if there is consistent comparative result, then judges the whether first message of described fragment message further.
Step C, if described message is first message, is stored into first message information in burst information list item, and sends first message.
Step D, processes the processing mode of the successive fragment message of the described first message existed according to the first message received, and the successive fragment message after transmission processing.
Step e, if described message is successive fragment message, then judges whether the first message information that there is described successive fragment message, as existed, then processes according to the processing mode of first message, and the successive fragment message after transmission processing; If do not existed, then store described successive fragment message.
Described characteristic value is source IP address, object IP address, IP mark and protocol type.
Described burst information list item according to described source IP address, object IP address, IP mark and the crc value that calculates of protocol type as index.
Described steps A comprises:
Steps A 1, the crc value that the crc value of the fragment message of more described reception and described burst information list item store.
Steps A 2, if there is identical crc value, more described source IP address, object IP address, IP mark and protocol type further.
Steps A 3, if comparative result is consistent, then performs step B.
Also comprise further after described steps A 3:
Steps A 4, if comparative result is inconsistent, judges whether described fragment message has subordinate's pointer further.
Steps A 5, if described fragment message has subordinate's pointer, then reads the next data structure of burst information list item and returns steps A 1; If described message does not have subordinate's pointer, then a newly-built data structure in burst information list item.
A kind of message fragment processing unit, adopt the data message that FPGA process receives, burst information list item to be stored in described FPGA sheet in resource or external internal memory, and the content of described burst information list item comprises characteristic value and the first message information of the fragment message of storage.
Described device comprises:
Characteristics comparing unit, the characteristic value that characteristic value and described burst information list item for comparing the fragment message of reception store.
First judging unit, if for there is consistent comparative result, is then judging the whether first message of described fragment message further.
First transmitting element, if for being first message at described message, be stored in burst information list item by first message information, and sends first message.
Follow-up transmitting element, for the processing mode of the successive fragment message of the described first message existed according to the first message received is processed, and the successive fragment message after transmission processing.
Subsequent processing units, if for being successive fragment message at described message, then judge whether the first message information that there is described successive fragment message, as existed, then processes according to the processing mode of first message, and the successive fragment message after transmission processing; If do not existed, then store described successive fragment message.
Described characteristic value is source IP address, object IP address, IP mark and protocol type.
Described burst information list item according to described source IP address, object IP address, IP mark and the crc value that calculates of protocol type as index.
Described characteristics comparing unit comprises:
CRC comparison module, the crc value that crc value and described burst information list item for the fragment message of more described reception store.
Four-tuple comparison module, if for there is identical crc value, more described source IP address, object IP address, IP mark and protocol type, if comparative result is consistent, performing first judging unit further.
Described characteristics comparing unit also comprises further:
Pointer judging unit, inconsistent for working as comparative result, judge whether described fragment message has subordinate's pointer further.
Data structure manipulations unit, for having subordinate's pointer when described fragment message, then reads the next data structure of burst information list item and returns CRC comparison module; When described message does not have subordinate's pointer, then a newly-built data structure in burst information list item.
With use the CPU of master control or network controller to compared with the Message processing processing the network equipment in prior art, the present invention adopts the mode of FPGA to support on each port of each board, and successive fragment message and first message carry out same process, thus the closed-in construction network equipment of high density, high forwarding performance can be supported, and realize high handling property, fragment message process efficiently.
Accompanying drawing explanation
Fig. 1 is the flow chart of message fragment processing method of the present invention;
Fig. 2 is the structure chart of message fragment processing unit of the present invention.
Embodiment
Describe the present invention below in conjunction with accompanying drawing.
Process for using the CPU of master control or the message of network controller to the network equipment in prior art, the present invention adopts the mode of FPGA, when not increasing extra hardware chip, the each port of each board being supported, successive fragment message and first message carry out same process, thus the closed-in construction network equipment of high density, high forwarding performance can be supported, and realize high handling property, fragment message process efficiently.
The invention provides a kind of message fragment processing method, adopt the data message that FPGA process receives, burst information list item to be stored in described FPGA sheet in resource or external internal memory, and the content of described burst information list item comprises characteristic value and first message information.
Referring to Fig. 1, described method comprises:
Steps A, compares the characteristic value of the fragment message of reception and the characteristic value of described burst information list item storage.
Step B, if there is consistent comparative result, then judges the whether first message of described fragment message further.
Step C, if described message is first message, is stored into first message information in burst information list item, and sends first message.
Step D, processes the processing mode of the successive fragment message of the described first message existed according to the first message received, and the successive fragment message after transmission processing.
Step e, if described message is successive fragment message, then judges whether the first message information that there is described successive fragment message, as existed, then processes according to the processing mode of first message, and the successive fragment message after transmission processing; If do not existed, then store described successive fragment message.
Described characteristic value is source IP address, object IP address, IP mark and protocol type.
Described burst information list item according to described source IP address, object IP address, IP mark and the crc value that calculates of protocol type as index.
Described step B comprises:
Step B1, the crc value that the crc value of the fragment message of more described reception and described burst information list item store.
Step B2, if there is identical crc value, more described source IP address, object IP address, IP mark and protocol type further.
Step B3, if comparative result is consistent, then performs step C.
Also comprise further after described step B3:
Step B4, if comparative result is inconsistent, judges whether described fragment message has subordinate's pointer further.
Step B5, if described fragment message has subordinate's pointer, then reads the next data structure of burst information list item and returns step B1; If described message does not have subordinate's pointer, then a newly-built data structure in burst information list item.
Described source IP address, object IP address, IP mark and protocol type are called again the four-tuple of fragment message, can determine whether fragment message belongs to same data flow by the four-tuple of fragment message.The four-tuple that the four-tuple of more described reception fragment message and burst information list item store, if comparative result unanimously, illustrates that described fragment message belongs to data structure corresponding to this burst information list item, fragment message belongs to this data structure.
Described data structure is chained list, array, number or figure.
Judge that the whether first message of fragment message is judged by message mark in described step C.
If the four-tuple comparative result that the four-tuple of described reception fragment message and described burst information list item store is inconsistent, then illustrate that described fragment message does not belong to data structure corresponding to this burst information list item.At this time judge whether described fragment message has subordinate's pointer, if had, then read data structure corresponding to subordinate's pointer according to subordinate's pointer of fragment message.The four-tuple comparative result of the burst information list item of the data structure whether four-tuple rejudging this fragment message is corresponding with subordinate pointer is consistent, whether belongs to this data structure.
If described message does not have subordinate's pointer, then the data structure of the correspondence that described fragment message is not determined is described, then the message of newly-built data structure storage reception.
Referring to Fig. 2, the present invention also provides a kind of message fragment processing unit, adopt the data message that FPGA process receives, burst information list item to be stored in described FPGA sheet in resource or external internal memory, and the content of described burst information list item comprises characteristic value and the first message information of the fragment message of storage.
Described device comprises:
Characteristics comparing unit, the characteristic value that characteristic value and described burst information list item for comparing the fragment message of reception store.
First judging unit, if for there is consistent comparative result, is then judging the whether first message of described fragment message further.
First transmitting element, if for being first message at described message, be stored in burst information list item by first message information, and sends first message.
Follow-up transmitting element, for the processing mode of the successive fragment message of the described first message existed according to the first message received is processed, and the successive fragment message after transmission processing.
Subsequent processing units, if for being successive fragment message at described message, then judge whether the first message information that there is described successive fragment message, as existed, then processes according to the processing mode of first message, and the successive fragment message after transmission processing; If do not existed, then store described successive fragment message.
Described characteristic value is source IP address, object IP address, IP mark and protocol type.
Described burst information list item according to described source IP address, object IP address, IP mark and the crc value that calculates of protocol type as index.
Described characteristics comparing unit comprises:
CRC comparison module, the crc value that crc value and described burst information list item for the fragment message of more described reception store.
Four-tuple comparison module, if for there is identical crc value, more described source IP address, object IP address, IP mark and protocol type, if comparative result is consistent, performing first judging unit further.
Described characteristics comparing unit also comprises further:
Pointer judging unit, inconsistent for working as comparative result, judge whether described fragment message has subordinate's pointer further.
Data structure manipulations unit, for having subordinate's pointer when described fragment message, then reads the next data structure of burst information list item and returns CRC comparison module; When described message does not have subordinate's pointer, then a newly-built data structure in burst information list item.
The present invention ensures that the subsequent packet transmitted at LA Management Room also carries out the process identical with first message, thus ensure that the filtration treatment to subsequent packet.Although prior art also uses the CPU of master control or the message of network controller to the network equipment to process, it is not also suitable for the frame network equipment of high density, high forwarding performance.The present invention uses FPGA to process the filtration of successive fragment message, not only can improve the handling property of fragment message, and the burst process of each port support hardware for each board, more efficiently.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (10)
1. a message fragment processing method, it is characterized in that, adopt the data message that FPGA process receives, burst information list item to be stored in described FPGA sheet in resource or external internal memory, and the content of described burst information list item comprises characteristic value and the first message information of the fragment message of storage;
Described method comprises:
Steps A, compares the characteristic value of the fragment message of reception and the characteristic value of described burst information list item storage;
Step B, if there is consistent comparative result, then judges the whether first message of described fragment message further;
Step C, if described message is first message, is stored into first message information in burst information list item, and sends first message;
Step D, processes the processing mode of the successive fragment message of the described first message existed according to the first message received, and the successive fragment message after transmission processing;
Step e, if described message is successive fragment message, then judges whether the first message information that there is described successive fragment message, as existed, then processes according to the processing mode of first message, and the successive fragment message after transmission processing; If do not existed, then store described successive fragment message.
2. the method for claim 1, is characterized in that, described characteristic value is source IP address, object IP address, IP mark and protocol type.
3. method as claimed in claim 2, is characterized in that, the crc value that described burst information list item calculates according to described source IP address, object IP address, IP mark and protocol type is as index.
4. method as claimed in claim 3, it is characterized in that, described steps A comprises:
Steps A 1, the crc value that the crc value of the fragment message of more described reception and described burst information list item store;
Steps A 2, if there is identical crc value, more described source IP address, object IP address, IP mark and protocol type further;
Steps A 3, if comparative result is consistent, then performs step B.
5. method as claimed in claim 4, is characterized in that, also comprises further after described steps A 3:
Steps A 4, if comparative result is inconsistent, judges whether described fragment message has subordinate's pointer further;
Steps A 5, if described fragment message has subordinate's pointer, then reads the next data structure of burst information list item and returns steps A 1; If described message does not have subordinate's pointer, then a newly-built data structure in burst information list item.
6. a message fragment processing unit, it is characterized in that, adopt the data message that FPGA process receives, burst information list item to be stored in described FPGA sheet in resource or external internal memory, and the content of described burst information list item comprises characteristic value and the first message information of the fragment message of storage; Described device comprises:
Characteristics comparing unit, the characteristic value that characteristic value and described burst information list item for comparing the fragment message of reception store;
First judging unit, if for there is consistent comparative result, is then judging the whether first message of described fragment message further;
First transmitting element, if for being first message at described message, be stored in burst information list item by first message information, and sends first message;
Follow-up transmitting element, for the processing mode of the successive fragment message of the described first message existed according to the first message received is processed, and the successive fragment message after transmission processing;
Subsequent processing units, if for being successive fragment message at described message, then judge whether the first message information that there is described successive fragment message, as existed, then processes according to the processing mode of first message, and the successive fragment message after transmission processing; If do not existed, then store described successive fragment message.
7. device as claimed in claim 6, is characterized in that, described characteristic value is source IP address, object IP address, IP mark and protocol type.
8. device as claimed in claim 7, is characterized in that, the crc value that described burst information list item calculates according to described source IP address, object IP address, IP mark and protocol type is as index.
9. method as claimed in claim 8, it is characterized in that, described characteristics comparing unit comprises:
CRC comparison module, the crc value that crc value and described burst information list item for the fragment message of more described reception store;
Four-tuple comparison module, if for there is identical crc value, more described source IP address, object IP address, IP mark and protocol type, if comparative result is consistent, performing first judging unit further.
10. method as claimed in claim 9, it is characterized in that, described characteristics comparing unit also comprises further:
Pointer judging unit, inconsistent for working as comparative result, judge whether described fragment message has subordinate's pointer further;
Data structure manipulations unit, for having subordinate's pointer when described fragment message, then reads the next data structure of burst information list item and returns CRC comparison module; When described message does not have subordinate's pointer, then a newly-built data structure in burst information list item.
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| CN109618020A (en) * | 2018-12-25 | 2019-04-12 | 北京物芯科技有限责任公司 | A kind of method for network address translation and device of fragment message |
| CN109726144A (en) * | 2018-12-27 | 2019-05-07 | 新华三技术有限公司 | A kind for the treatment of method and apparatus of data message |
| CN109889779A (en) * | 2019-01-31 | 2019-06-14 | 视联动力信息技术股份有限公司 | A kind for the treatment of method and apparatus of packet out-ordering |
| CN110198315A (en) * | 2019-05-30 | 2019-09-03 | 新华三信息安全技术有限公司 | A kind of method and device of Message processing |
| CN110351208A (en) * | 2019-07-03 | 2019-10-18 | 天津华云软件有限公司 | A kind of message forwarding method, device, equipment and computer readable storage medium |
| CN111355672A (en) * | 2020-03-02 | 2020-06-30 | 杭州迪普信息技术有限公司 | Message forwarding method and device |
| CN113411341A (en) * | 2021-06-24 | 2021-09-17 | 成都卫士通信息产业股份有限公司 | Data processing method, device and equipment and readable storage medium |
| CN114788199A (en) * | 2019-12-31 | 2022-07-22 | 华为技术有限公司 | Data verification method and device |
| CN115065735A (en) * | 2022-03-08 | 2022-09-16 | 阿里巴巴（中国）有限公司 | Message processing method and electronic equipment |
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| CN114788199A (en) * | 2019-12-31 | 2022-07-22 | 华为技术有限公司 | Data verification method and device |
| CN111355672A (en) * | 2020-03-02 | 2020-06-30 | 杭州迪普信息技术有限公司 | Message forwarding method and device |
| CN113411341A (en) * | 2021-06-24 | 2021-09-17 | 成都卫士通信息产业股份有限公司 | Data processing method, device and equipment and readable storage medium |
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Address after: 100029 Beijing city Chaoyang District Yumin Road No. 3 Applicant after: State Computer Network and Information Safety Management Center Applicant after: Hangzhou Dipu Polytron Technologies Inc Address before: 100029 Beijing city Chaoyang District Yumin Road No. 3 Applicant before: State Computer Network and Information Safety Management Center Applicant before: Hangzhou Dipu Technology Co., Ltd. |
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Application publication date: 20150429 |