CN100502391C - Reorganizing method of slicing message - Google Patents
Reorganizing method of slicing message Download PDFInfo
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- CN100502391C CN100502391C CNB200410062997XA CN200410062997A CN100502391C CN 100502391 C CN100502391 C CN 100502391C CN B200410062997X A CNB200410062997X A CN B200410062997XA CN 200410062997 A CN200410062997 A CN 200410062997A CN 100502391 C CN100502391 C CN 100502391C
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Abstract
The method includes following steps: three levels index tables and recombination message table are build in IP message reception end; the first level index table takes IP fragmentation message and IP protocol type as index, and points to the second level index table taking ID field of IP fragmentation message as index; the second level index points to the third level index table taking source IP address of IP fragmentation message as index; the third level index table points to recombination message table of IP fragmentation message; after IP message reception end receives the IP fragmentation message, with the three levels index tables, and then with recombination message table, implements the recombination of IP fragmentation message.
Description
Technical field
(Internet Protocol, IP) processing of layer message is specifically related to the recombination method of IP fragmentation message to the present invention relates to the IP(Internet Protocol) in data communication field.
Background technology
In data communication network, the IP message will just can send by physical layer.Physical layer generally will limit the maximum length (Maximum Transfer Data) of the Frame that once sends.Therefore, before the IP layer is submitted a IP message to physical layer, need know MTU (MaximumTransmission Unit) size of physical layer, and determine whether need this IP message is divided into multi-disc, can not surpass MTU with the size that guarantees the physical layer message.Accordingly, at the receiving terminal of IP message, need to judge whether the IP message of receiving is a complete message, perhaps only is a burst of IP message.If what receive is the burst of IP message, then need a plurality of IP fragmentations are recombinated, finally revert to a complete IP message.
In the stem of IP message, comprised the information relevant with IP fragmentation.These information mainly contain: 32 source IP address, and 16 sign, 8 IP protocol type and 13 burst skew, as shown in Figure 1.
In Fig. 1,16 identification field designs for each IP fragmentation message being recombinated at last exactly become a complete IP message.A plurality of bursts of same IP message have identical source IP address, identical IP protocol type and 16 identical bit-identifies.The burst that has only this three all to mate fully just belongs to same IP message, and receiving device is judged a plurality of bursts in view of the above and whether belonged to same IP message, and they are recombinated.
Attribute field accounts for 3 bits (bit), has only preceding two bits meaningful at present.Lowest order in the attribute field is MF (More Fragment), expression " more sheet ".MF=1 represents that promptly the back also has follow-up IP fragmentation, and MF=0 represents that this is last that belongs in a plurality of bursts of same complete IP message.Except last burst, other each fragment message all will put 1 with MF.In the middle of the attribute field one is designated as DF (Don ' t Fragment), expression " not burst ".Have only and when DF=0, just allow segmentation.If this bit is put 1, IP will not carry out burst to the data message.
In Fig. 1,13 burst offset field refers to the position at this burst skew initial IP start of heading place.In addition, after the IP message was by burst, each burst was the length value of this IP fragmentation message itself in the total length value of IP stem.
At the transmitting terminal of IP message, the burst process of IP message is: the data division of at first that length is bigger IP message splits into a plurality of bursts, guarantee the size that is no more than MTU of the physical frame length of each burst.And then according to the implication of above-described 16 sign, 3 sign and 13 s' fields such as burst offset address, encapsulation IP header message.By physical layer, message is sent at last.
Receiving terminal at the IP message, the regrouping process of IP fragmentation message is: according to the source IP address of the burst that receives, the value of sign and protocol type judges whether a plurality of bursts that receive belong to same complete IP message, and for belonging to the burst preservation state information of same IP message.If, the data division of these bursts is taken out one by one, and reorganization is got up in order then according to the burst offset field of 13 of IP headings.After all bursts of same IP message are received, just can finish the reorganization of a plurality of IP fragmentations, finally revert to a complete IP message.
When carrying out the reorganization of fragment message, need set up a shuffling information table, be used to preserve and information such as the address of recombinate relevant state information and each fragment message, length.After receiving device receives an IP fragmentation, find corresponding shuffling information table according to the sign in source IP address, IP protocol type and the IP head.Know and IP protocol type respectively accounts for 32,16 and 8 bits as the source IP address of shuffling information table index, IP leader, the wide range of index value, so the difficult point of IP fragmentation reorganization just is the tissue of shuffling information table and searches.Especially in real time business such as voice or video communication, finish the reorganization of IP fragmentation simultaneously and guarantee enough little time-delay, be difficult to realize with existing mode.
Search the shuffling information table at present and mainly contain two kinds of schemes:
First kind is to set up a shuffling information table for the combination of each source IP address that may occur, IP protocol type and 16 bit-identifies.To each burst that receives, can directly find a shuffling information table according to source IP address, IP protocol type and 16 s' sign, the information of current all bursts that receive of record and upgrade the state of reorganization in this table then is such as the address of each burst in internal memory, message length etc.After receiving last burst of burst IP message, the data division of all bursts is recombinated, revert to a complete IP message again.A shuffling information table is set up in this combination for each source IP address that may occur, IP protocol type and 16 bit-identifies, and needed list item number is very huge, and the internal memory that needs is too many, has only theoretic feasibility.
Second kind of scheme and first kind of scheme are different.In this scheme, receiving device received with a dynamically in store current time of formation but all source IP address, IP protocol type and identifier combination of burst IP message of finishing of reorganization, and sets up a shuffling information table for each combination.The source IP address, IP protocol type and the identifier combination that do not have repetition in the formation, and after the reorganization of finishing an IP message, corresponding combination will be deleted from formation.To each burst that receives, the combination of source IP address, IP protocol type and the sign of preserving in its source IP address, IP protocol type and 16 bit-identifies and the formation is mated one by one.If do not find the item of coupling fully, then set up a shuffling information table, and this combination is increased in this formation for this combination.If can find fully the item of coupling, represent that then corresponding shuffling information table sets up.Like this, each IP fragmentation that receives can find a shuffling information table.By the shuffling information table, can find the information of all bursts of the same IP of burst message, and they are recombinated, revert to a complete IP message again.The shortcoming of second kind of reorganization scheme is that the time of burst reorganization is uncontrollable.When synchronization has the burst of more different IP message, need carry out repeatedly the coupling of source IP address, IP protocol type and sign.In the voice and video communication that real-time is had relatively high expectations, real-time can't guarantee.
From above two kinds of prior art schemes as can be seen, the prior art scheme fails to provide the IP that a kind of memory requirements is little and real-time is good message recombining method in IP message regrouping process.First kind of technical scheme need consume more memory source, and real-time is poor, though second kind first kind of technical scheme improved to some extent, on request memory, reduce greatly, equally can't requirement of real time.
Summary of the invention
In view of above-mentioned existing in prior technology shortcoming, the purpose of this invention is to provide the IP message recombining method that a kind of memory requirements is little and real-time is good.
The objective of the invention is to be achieved through the following technical solutions:
A kind of recombination method of IP(Internet Protocol) IP fragmentation message is applied to the IP message sink of IP layer, comprises step:
1) in described IP message sink, sets up three level index tables and shuffling information table, the one-level concordance list is that the IP protocol type with described IP fragmentation message is the concordance list of index, the identification field that the one-level concordance list points to described IP fragmentation message is the secondary index table of index, the source IP address that the secondary index table points to described IP fragmentation message is three grades of concordance lists of index, and three grades of concordance lists point to the described shuffling information table of described IP fragmentation message;
2) described IP message sink finds corresponding described shuffling information table according to described three level index tables after receiving described IP fragmentation message, finishes the reorganization of described IP fragmentation message then according to described shuffling information table.
Wherein, the list item number of the one-level concordance list described in the described step 1) is the number of the described IP protocol type that need support of described IP message sink, and the number of described secondary index table is the list item number of described one-level concordance list.
Wherein, three grades of concordance lists in the described step 1) are dynamically to set up, when described IP fragmentation message does not have corresponding described three grades of concordance lists according to described source IP address index, then be that described IP fragmentation message is set up corresponding described three grades of concordance lists, after the described IP fragmentation message of described three grades of concordance list correspondences has all been recombinated, described three grades of concordance lists of then deletion correspondence.
Wherein, list item in three grades of concordance lists described in the described step 1) is dynamically to set up, when described IP fragmentation message does not have the list item of three grades of corresponding concordance lists, then set up the list item of corresponding described three grades of concordance lists for it, after the described IP fragmentation message of described three grades of concordance list list item correspondences has all been recombinated, the list item of described three grades of concordance lists of then deletion correspondence.
Wherein, described step 1) also comprises, sets up for described IP fragmentation message after the list item of corresponding described three grades of concordance lists, also is that described IP fragmentation message is set up corresponding described shuffling information table; Delete the list item of described three grades of concordance lists, also delete the shuffling information table of the described IP fragmentation message of three grades of index list item correspondences.
Wherein, the list item of described secondary index table comprises the field of the IP fragmentation message number that expression is being handled.
As seen from the above technical solution provided by the invention, the present invention can reach following technique effect:
At first, the present invention only needs less internal memory.
From the prior art analysis, we can know that in fact the recombination method of existing IP fragmentation message adopt is the shuffling information table that the method for one-level concordance list is searched the IP fragmentation message, promptly with the concordance list that is combined as index of source IP address, IP protocol type and 16 bit-identifies, so technique scheme is once because the combined number of source IP address, IP protocol type and 16 bit-identifies is huge, need internal memory to have feasibility too much and not.The present invention adopts the method for three level index tables, therefore, the index value that only needs to preserve three other concordance lists of level just can, rather than the combination at random of the index value in three level index tables, thus reduce taking of internal memory greatly.And, the present invention further can limit three level index tables, internal memory is used more to be optimized: the number of the IP protocol type that need support as the IP message sink as the list item number of the first rank concordance list, thereby avoid unnecessary protocol type as the index committed memory, be set to dynamic foundation such as other concordance list of the third level or index list item again, even other concordance list of the third level and index list item all be set to dynamic foundation, thereby can reduce the use of internal memory widely, because, after the IP fragmentation message carries out index through the first and second level index tables, receiving terminal receives simultaneously has different source IP addresss but the probability of the sign IP fragmentation message identical with protocol type is very little, adopt dynamically set up the other concordance list of the third level or the concordance list list item feasible fully, and utilize dynamic three grades of concordance lists just can avoid unnecessary source IP address as the index committed memory, therefore significantly reduce EMS memory occupation.
Secondly, the present invention can guarantee the real-time of recombinating.
Only be provided with in the prior art and be combined as the one-level index with source IP address, IP protocol type and sign, therefore, seek scope is unqualified, and because index is the binding combination with source IP address, IP protocol type and sign, can occur unwanted index value is relatively searched repeatedly, thereby can not guarantee real-time.The present invention adopts the method for three level index tables, other index of the first order defines the seek scope of second level index, the index of second level defines the seek scope of the other index of the third level, this qualification can be dwindled seek scope well, avoid unwanted index value is relatively searched repeatedly, and three secondary index search the list item number that maximum number of comparisons is three other concordance lists of level, the maximum processing time can be predicted, guarantee real-time.And, the present invention further can limit three level index tables, the number of the IP protocol type that need support for the IP message sink as the list item number of the first rank concordance list, and with the IP message identification as the secondary index table index, why use the IP message identification as the secondary index table index, be after carrying out index because of the IP fragmentation message through the first and second level index tables, receiving terminal receives simultaneously has different source IP addresss but the probability of the sign IP fragmentation message identical with protocol type is very little, other concordance list of the third level or index list item are set to dynamic foundation, even other concordance list of the third level and index list item all be set to dynamic foundation, thereby the list item that further reduces in three grades of concordance lists reduces number of comparisons, these can both optimize the present invention further, thereby shorten searching the time of IP message shuffling information table, guarantee real-time.
Description of drawings
Fig. 1 is an IP heading schematic diagram;
Fig. 2 is an IP fragmentation message reorganization flow chart;
Fig. 3 is three level index graphs of a relation of IP fragmentation message.
Embodiment
The present invention adopts the mode of three level index, sets up three concordance lists and carries out searching of IP fragmentation message shuffling information table, carries out the reorganization of IP fragmentation message according to the IP fragmentation message shuffling information table that finds then.IP fragmentation message reorganization flow chart below in conjunction with Fig. 2 comes specific explanations the present invention:
At first set up an one-level concordance list, the IP protocol type that the number of its list item can need be supported for equipment.Because in fact the IP protocol type number that need support of equipment is limited, therefore the list item that needs is less.IP fragmentation message to the needs reorganization is searched the one-level concordance list with IP protocol type, and the one-level index that obtains will point to a secondary index table.
Each one-level index all points to a secondary index table, and each secondary index table is that 65536 list items of field are formed by 16 bit-identifies.16 bit-identifies with the IP fragmentation message are searched the secondary index table, and the secondary index that obtains will point to three grades of concordance lists.
Search three grades of concordance lists with the source IP address of IP fragmentation message, the shuffling information table of three grades of index point that obtains, the corresponding burst IP message of recombinating of each shuffling information table.Receiving terminal receives simultaneously has different source IP addresss but the probability of the 16 bit-identifies IP fragmentation identical with protocol type is very little, so three grades of index maximum numbers that three grades of concordance lists comprise can be less, be traditionally arranged to be 4 just passablely, just can satisfy actual needs.Can reduce the memory headroom that the IP fragmentation reorganization needs so widely, and improve the speed of reorganization.
The present invention is very few in view of the list item number in three grades of concordance lists, therefore adopts the method for dynamically setting up three grades of concordance lists or index list item.It is specific as follows: when the secondary index of current IP fragment message does not have three grades of corresponding concordance lists, then set up a list item and a shuffling information table in three grades of concordance lists, the three grades of concordance lists for current burst, expression has the reorganization of a new IP fragmentation message to carry out, in the list item of three grades of concordance lists, write down the source IP address of this new IP fragmentation message simultaneously, the shuffling information of this IP fragmentation message of record in the shuffling information table; If can find three grades of corresponding concordance lists, but when not having the list item of three grades of corresponding concordance lists, then be a list item and shuffling information table that current burst is set up three grades of corresponding concordance lists, expression has the reorganization of a new burst IP message to carry out, in the list item of three grades of concordance lists, write down the source IP address of this new IP fragmentation message simultaneously, the shuffling information of this IP fragmentation message of record in the shuffling information table; If can find three grades of corresponding concordance lists, also can find the list item of three grades of corresponding concordance lists, represent that then corresponding shuffling information table sets up, can utilize existing three grades of index to find corresponding shuffling information table.
Write down the information of all bursts of current that receive, the complete IP message that belongs to same burst in the shuffling information list item, comprising information such as the length of the address of each burst in internal memory, burst and sheet skew.After receiving last burst of the same IP of burst message,, a complete IP message can be recovered out again by these information.After a complete IP message reorganization finishes, then delete the shuffling information table of this IP message correspondence and the corresponding list item of three grades of concordance lists of correspondence.After the corresponding IP fragmentation message of all list items in three grades of concordance lists is all finished reorganization, then delete this three grades of concordance lists.
Because the disposal ability of each receiving device is different, therefore state in realization in the middle of the process of invention, can be according to the one-level concordance list of concrete equipment situation at foregoing description, in secondary index table or the three grades of concordance lists, in form, increase out of Memory, but realize that the technical scheme of the object of the invention is the inventive method of foregoing description.Information additional in this concordance list can be quite flexible, and design will specifically describe among the embodiment below fully according to actual needs.
Illustrate a preferred implementation process of the present invention below.Because in concrete equipment implementation procedure, equipment has the disposal ability of himself, the ability of supposing the receiving device processing IP partitioned message is: support 10 kinds of fragment messages with different IP protocol types at most simultaneously, support 256 reorganization with the IP of burst message of different identification at most simultaneously; Support 4 to have different source IP addresss at most simultaneously, but have the reorganization of the IP of the burst message of like-identified and agreement; For the same IP of burst message, the maximum burst number that can support is 128.Theory analysis and practice show that all the ability of this processing burst of receiving terminal can satisfy actual needs fully.Three level index relations see Fig. 3 for details.
Set up an one-level concordance list.The one-level concordance list has 10 list items, and each list item all comprises the IP protocol type value of one 8 bit and the one-level index value of another 8 bit.The one-level index is used for searching of secondary index table.
For a secondary index table set up in each one-level index.A secondary index table has 65536 list items, each list item all comprises the secondary index value of the IP identification field values of one 16 bit and one 8 bit and the field of another 8 bit, and the field of this another 8 bits is represented the number of the current IP of the burst message of handling.The secondary index value is used for three grades of concordance lists to searching.
And then set up 256 dynamic three grades of concordance lists.These three grades of concordance lists are received all IP fragmentations and share, and no matter whether they have identical protocol type, source IP address, or 16 sign.Each three grades of concordance list can comprise 4 three grades of index values and corresponding information such as source IP address at most.Three grades of index account for 8 bits, point to a shuffling information table.
For an IP fragmentation shuffling information table set up in each three grades of index, need 256 * 4=1024 altogether.Each shuffling information table can comprise 128 IP fragmentation information at most, and IP fragmentation information comprises the memory address in internal memory of this burst, information such as field offset.
After receiving an IP fragmentation, at first search according to its IP protocol type one-level concordance list.If in the one-level concordance list, be complementary without any the IP protocol type of an IP protocol type and current message, illustrate that then current burst is not a legal message, and it abandoned that processing finishes.Otherwise, step below continuing.
With the one-level index search that obtains to the secondary index table.After finding a list item of secondary index table, if the field of the number of the current IP of the burst message of handling of expression of 8 bits is non-vanishing in the middle of the list item, then expression existing before this several bursts have and rigidly connect the burst of receiving at present and have 16 identical bit-identifies, and these several bursts all also do not reassemble into a complete IP message, and the IP fragmentation of this sign has been set up three grades of index.Find this three grades of concordance lists with the secondary index value, and several source IP addresss that comprise in the source IP address of current message and the three grades of index are compared one by one.If the source IP address of current message is all different with any one source IP address in three grades of index, then be a list item and shuffling information table that current burst is set up three grades of corresponding concordance lists, expression has the reorganization of a new burst IP message to carry out, in the list item of three grades of concordance lists, write down the source IP address of this new IP fragmentation message simultaneously, the information such as address, field offset and message length in the shuffling information table of correspondence in the internal memory of this burst of record.Otherwise, if some identical in the source IP address of current burst and the three grades of concordance lists, then think other burst that has received the same IP of burst message before this, and, be recorded in the corresponding shuffling information table such as the address in internal memory, field offset and message length etc. with the relevant information of current burst.After one all bursts of burst IP message have all received, just can take out the data division of all bursts, reassemble into a complete IP message.
The non-vanishing processing procedure of number of the current IP of the burst message of handling in the secondary index table has been described in the front.If the number of the current IP of the burst message of handling is zero, mean that then current burst is the unique burst with this 16 bit-identify that receiving terminal receives this moment.So just should index value be write in the corresponding list item of second level concordance list, and " number of the current IP of the burst message of handling " in the list item is made as 1 for this burst distributes three grades of concordance lists.
This shows that three grades of concordance lists are dynamically to set up, is not to concern one to one between three grades of concordance lists and the secondary index table.Three grades of concordance lists are as a kind of resource, only when needed, just set up related between three grades of index and the secondary index.Three grades of concordance lists after dispensing, sub-distribution again before not reclaiming.When finishing one after the reorganization of burst IP message, " number of the current IP of the burst message of handling " in the secondary index table be subtracted 1, and will be recorded in three grades of source IP addresss deletions in the concordance list, the information in the corresponding shuffling information table is also deleted.After " number of the current IP of the burst message of handling " reduced to 0, corresponding three grades of concordance lists were recovered, and can distribute use once more.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1, a kind of recombination method of IP(Internet Protocol) IP fragmentation message is applied to the IP message sink of IP layer, it is characterized in that, comprises step:
1) in described IP message sink, sets up three level index tables and shuffling information table, the one-level concordance list is that the IP protocol type with described IP fragmentation message is the concordance list of index, the identification field that the one-level concordance list points to described IP fragmentation message is the secondary index table of index, the source IP address that the secondary index table points to described IP fragmentation message is three grades of concordance lists of index, and three grades of concordance lists point to the described shuffling information table of described IP fragmentation message;
2) described IP message sink finds corresponding described shuffling information table according to described three level index tables after receiving described IP fragmentation message, finishes the reorganization of described IP fragmentation message then according to described shuffling information table.
2, the recombination method of IP fragmentation message according to claim 1, it is characterized in that, the list item number of the one-level concordance list described in the described step 1) is the number of the described IP protocol type that need support of described IP message sink, and the number of described secondary index table is the list item number of described one-level concordance list.
3, the recombination method of IP fragmentation message according to claim 1, it is characterized in that, three grades of concordance lists in the described step 1) are dynamically to set up, when described IP fragmentation message does not have corresponding described three grades of concordance lists, then be that described IP fragmentation message is set up corresponding described three grades of concordance lists, after the described IP fragmentation message of described three grades of concordance list correspondences has all been recombinated, described three grades of concordance lists of then deletion correspondence.
4, according to the recombination method of claim 1 or 3 described IP fragmentation messages, it is characterized in that, list item in three grades of concordance lists described in the described step 1) is dynamically to set up, when described IP fragmentation message does not have the list item of three grades of corresponding concordance lists, then set up the list item of corresponding described three grades of concordance lists for it, after the described IP fragmentation message of described three grades of concordance list list item correspondences has all been recombinated, the list item of described three grades of concordance lists of then deletion correspondence.
5, the recombination method of IP fragmentation message according to claim 4, it is characterized in that, described step 1) also comprises, sets up for described IP fragmentation message after the list item of corresponding described three grades of concordance lists, also is that described IP fragmentation message is set up corresponding described shuffling information table; Delete the list item of described three grades of concordance lists, also delete the shuffling information table of the described IP fragmentation message of three grades of index list item correspondences.
6, the recombination method of IP fragmentation message according to claim 1 and 2 is characterized in that, the list item of described secondary index table comprises the field of the IP fragmentation message number that expression is being handled.
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| CN100420238C (en) * | 2006-04-12 | 2008-09-17 | 华为技术有限公司 | Method for partitioned recombining IP message |
| CN101237405B (en) * | 2008-03-06 | 2012-10-17 | 华为技术有限公司 | Data buffer method and device |
| CN101662461B (en) * | 2008-08-27 | 2012-08-08 | 华为技术有限公司 | Method, device and system for recombining multilink protocol fragment data |
| CN101378549B (en) * | 2008-09-27 | 2012-01-25 | 华为终端有限公司 | Method, device and system for determining long short message affiliated by standard short message |
| CN101917472B (en) * | 2010-08-12 | 2013-05-29 | 北京星网锐捷网络技术有限公司 | Method, device and equipment for recombining multi-link messages |
| CN103780481B (en) * | 2012-10-18 | 2017-10-27 | 中兴通讯股份有限公司 | The method and device of message modification and forwarding in a kind of data communication network |
| CN108616327B (en) * | 2016-12-12 | 2021-03-26 | 中国航空工业集团公司西安航空计算技术研究所 | FC-ASM protocol-based concurrent fragment message receiving method and circuit |
| CN114584560B (en) * | 2022-03-11 | 2023-12-22 | 西南科技大学 | Method and device for reorganizing fragmented frames |
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