CN109842465A

CN109842465A - Data transmission method, data end equipment

Info

Publication number: CN109842465A
Application number: CN201711191694.1A
Authority: CN
Inventors: 任震宇
Original assignee: Alibaba Group Holding Ltd
Current assignee: Alibaba Group Holding Ltd
Priority date: 2017-11-24
Filing date: 2017-11-24
Publication date: 2019-06-04

Abstract

This application provides a kind of data transmission methods, data end equipment, wherein this method comprises: identification field is added in the packet header that client layer is data to be transmitted packet, to generate transmission data, wherein the identification field is for data to be transmitted packet described in unique identification；The transmission data are transmitted by protocol layer；Obtain the data being retransmitted, and the corresponding identification field of data being retransmitted described in extraction；According to the identification field of extraction, the data packet of client layer belonging to the data being retransmitted is determined.It is solved when retransmitting through the above scheme, data are transmitted in the form of data flow, it is not aware which data packet is the data of re-transmission correspond to, it certainly will thus will lead to and obstacle is led to the problem of to the analysis of the reason of delay or time-out, the reason of having reached the technical effect for being simple and efficient the corresponding relationship for determining to retransmit data packet and raw data packets, can effectively having analyzed network delay.

Description

Data transmission method, data end equipment

Technical field

The application belongs to field of computer technology more particularly to a kind of data transmission method, data end equipment.

Background technique

It is related to network in certain operation (such as: search key, read-write remote data etc.) of user application to pass When defeated, it is frequently encountered high latency or transmits time-out.This high latency is a time out and not only will affect user experience, and And be also possible to cause to accumulate in server end to request, to seriously affect the availability of service.

If effectively to solve these problems, service administrators either user it should be understood that these high latencies or The producing cause being a time out, to targetedly be repaired and be optimized.During actual network transmission, generation is prolonged Slow factor generally further includes the problem on network communication link other than transmitting terminal and the software issue of receiving end.

By taking TCP (Transmission Control Protocol, transmission control protocol) as an example, detecting that network is logical News link fails (such as: there is congestion or great fluctuation process in link) when, the retransmission operation for carrying out data segment can be triggered. However, when retransmitting, because data are transmitted in the form of data flow, in this case it is not apparent that re-transmission when TCP transmission Data correspond to which data packet that the either corresponding application program of which application program issues, and certainly will thus will lead to delay Or the analysis of the reason of time-out generates obstacle.

In view of the above-mentioned problems, currently no effective solution has been proposed.

Summary of the invention

The application is designed to provide a kind of data transmission method, data end equipment, may be implemented.

The application provides a kind of data transmission method, data end equipment is achieved in that

A kind of data transmission method, which comprises

Identification field is added in the packet header that client layer is data to be transmitted packet, to generate transmission data, wherein the mark Field is for data to be transmitted packet described in unique identification；

The transmission data are transmitted by protocol layer；

Obtain the data being retransmitted, and the corresponding identification field of data being retransmitted described in extraction；

According to the identification field of extraction, the data packet of client layer belonging to the data being retransmitted is determined.

A kind of data end equipment, including processor and for the memory of storage processor executable instruction, the place Reason device realizes following steps when executing described instruction:

The transmission data are transmitted by protocol layer；

A kind of computer readable storage medium is stored thereon with computer instruction, and it is above-mentioned that described instruction is performed realization The step of method.

Data transmission method provided by the present application, data end equipment pass through in the packet header that client layer is data to be transmitted packet Identification field is added and generates the mode for sending data, so that the identifier word wherein carried can be extracted for the data packet of re-transmission Section, may thereby determine that out the data packet being retransmitted corresponds to which data packet of client layer transmission.It solves through the above way It is existing when retransmitting, data are transmitted in the form of data flow, in this case it is not apparent which the data of re-transmission correspond to and answer Which data packet issued with the either corresponding application program of program, certainly will thus will lead to the reason to delay or time-out Analysis lead to the problem of obstacle, reached the skill for being simple and efficient the corresponding relationship for determining to retransmit data packet and raw data packets Art effect, the reason of can effectively analyzing network delay.

Detailed description of the invention

In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this The some embodiments recorded in application, for those of ordinary skill in the art, in the premise of not making the creative labor property Under, it is also possible to obtain other drawings based on these drawings.

Fig. 1 is the configuration diagram of data transmission system provided by the present application；

Fig. 2 is a kind of method flow diagram of embodiment of data transmission method provided by the present application；

Fig. 3 is a kind of schematic diagram of embodiment of transmission flow provided by the present application；

Fig. 4 is a kind of configuration diagram of embodiment of server provided by the present application；

Fig. 5 is a kind of modular structure schematic diagram of embodiment of data transmission device provided by the present application.

Specific embodiment

In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality The attached drawing in example is applied, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described implementation Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common The application protection all should belong in technical staff's every other embodiment obtained without creative efforts Range.

If considering to solve random ordering and packet loss in network communication, guarantee data correct (including number in the form of streaming According to content and succession) it is transferred to destination.It therefore, will not be immediately by data after kernel transport protocol sends data segment Section cleans up, and is maintained in a queue.After detecting out-of-order and packet loss, corresponding data will be found from queue It retransmits one time.For example, (corresponding ACK can not be received after giving out a contract for a project within a certain period of time in time-out by taking Transmission Control Protocol as an example Confirmation), speculate congestion (such as: continuously receiving three repeat ACKs, receive SACK etc.), receive when needing to distribute ICMP message into Row retransmits.

Retransmission operation is generally accompanied with the reduction of congestion window, or even stops the transmission to new data, and reflection is used to upper layer One presentation of family layer is exactly slack-off, appearance time-out of giving out a contract for a project, and What is more, and error is exited.Because the process of data transmission is to pass through What the mode of data flow was transmitted, client layer is transmitted through the data come and transmits in the way of flow data in a stream, When being retransmitted all operations, for transport protocol, also simply knows that and certain one piece of data stream is retransmitted, but not Know the data flow of these re-transmissions corresponds to which data packet of client layer.Correspondingly, client layer can only be seen to be give out a contract for a project it is slack-off, There is time-out etc., but not knowing is delay or time-out which data packet occurs.

If for this purpose, being used for the unique identification user number of plies in view of increasing by one in the data packet of client layer application program According to the identification field (such as: mark ID) of packet, and by the identification field also with data packet be transmitted to protocol layer (such as: TCP Layer), then when carrying out data transmission and retransmitting, so that it may determine that the data retransmitted are to belong to according to the identification field Which data packet.I.e., it is possible to go the association raw data packets that application program is sent originally by the Tag ID, can also apply After program finds certain request high latency or time-out, searched whether by the Tag ID of the request into re-transmission data event set Relevant Tag ID, thus judge the request high latency or time-out whether be as caused by network communication link problem, It even can further judge the reason of generating link problem.

Detecting that network communication link goes wrong (such as: congestion or great fluctuation process occurs in link) in view of existing When, the retransmission operation for carrying out data segment can be triggered.However, data are transmitted in the form of data flow when retransmitting, It is not aware that the data of re-transmission correspond to which data packet that the either corresponding application program of which application program issues, makes use of momentum in this way The analysis to the reason of delay or time-out must be caused to generate obstacle.

If marked thus by identification field to each data packet in view of increasing identification field in the packet Know, when retransmitting, this mark is also carried, then can also be based on the identifier word when carrying out data re-transmission Section determines the data packet being retransmitted corresponds to which original data packet, can be into the reason of so as to delay or supermarket The simple accurately analysis of row.

Based on this, a kind of data transmission system is provided in this example, as shown in Figure 1, comprising: sender 101, recipient 102, carried out data transmission between sender 101 and recipient 102 by Transmission Control Protocol, and depositing in case of a network fault, Triggering carries out data re-transmission.

In this example, increase identification field in the packet, each data packet is identified by identification field, When re-transmission, this mark is also carried, then can also determine based on the identification field when carrying out data re-transmission The data packet being retransmitted out corresponds to which original data packet.Specifically, a kind of data transmission method is provided in this example, As shown in Fig. 2, may include steps of:

S1: identification field is added in the packet header that client layer is data to be transmitted packet and generates transmission data, wherein the mark Field is for data to be transmitted packet described in unique identification；

I.e., it is possible in the data being ready for sending, for example, it may be data pending in 101 memory of sender, for the number According to identification field is increased, for example, the identification field is used for the unique identification data.

In order to enable could be aware which position is identification field in TCP data stream for processing end, can marking Increase instruction information before section of becoming literate (the instruction information can be known as to magic number).For example, the evil spirit number can be predetermined byte number The field of amount, for example, it may be 4 bytes, 8 bytes etc., the field preferably seldom used.In this way, when recognizing in data flow There is the field, so that it may which the field for determining back to back predetermined byte number is exactly the identification field of data packet.

By way of increasing identification field and identification field and indicating information, allow to determine the data packet retransmitted with Corresponding relationship between former data packet, so as to based on retransmit determine network failure the reason of.

S2: the transmission data are transmitted by protocol layer；

It when carrying out data transmission between sender and recipient, can be transmitted by transport protocol, such data Packet when transmission, is transmitted in the form of data flow.

S3: obtaining the identification field carried in the data being retransmitted, determines the number of client layer belonging to the data being retransmitted According to packet.

In upper example, by way of carrying identification field in raw data packets, so that when retransmitting, Ke Yitong It crosses the identification field and determines the data packet retransmitted is which application or which data packet from upper layer.That is, for being weighed It is available to be retransmitted the identification field carried in data for the data of biography, so that it is determined that going out the data packet retransmitted and former number According to the corresponding relationship between packet.

The transmission method of the data packet can be applied in client, can also be applied in server end, as long as network packet Sender, then can pass through this method carry out data packet transmission.That is, as long as party awarding the contract's (not being packet receiving side) is i.e. It can.Because client and server is all meeting, hairnet network packet is requested, both there is the possibility given out a contract for a project.Work as server When as the party awarding the contract, the transmission method of the data packet is just applied in the server, when client is as the party awarding the contract, The transmission method of the data packet is just applied in client.

In one embodiment, for the data packet of client layer, one can be increased in the packet header of each data packet Tag ID, further, in order to enable it is subsequent when carrying out data analysis and extracting, it is known which field is label ID can be identified by way of increasing magic number.I.e., it is possible to a magic number and a Tag ID is added in data packet head, this Sample can export the Tag ID of application layer data packet belonging to the data segment when Transmission Control Protocol retransmits data segment.

Above-mentioned evil spirit number can be the field predetermined with certain length, and above-mentioned Tag ID can be set to have The byte of certain length can choose the idle word that do not use temporarily when magic number and Tag ID are arranged in the packet Section carries magic number and Tag ID.2,4,8,16 etc. are selected as to the length property of can be exemplified of the above-mentioned magic number and Tag ID enumerated to appoint It anticipates one kind.When actually realizing, it can according to need the other length of selection and magic number and Tag ID be set.

In upper example, it is identifier word which field can be accurately judged in a stream by way of increasing magic number Section, which field is not identification field.

Further, it is contemplated that because in practical implementations, increasing Tag ID and magic number in the packet, may relating to And send and receive packets function is modified in system kernel, it, can be to these goal systems if rewriting these functions (that is, client or operating system of server operation) carries out excessive change.In order to avoid this large-scale change, One embodiment can modify to objective function through but not limited to following manner:

Mode 1) code bit specified during target program is run in user by operating system nucleus or privilege process Set (such as: the head of function, tail portion) special instruction collection is added, achieve the purpose that operation code set by user.

For example, using the referred to as mechanism of kprobe, it is real that user can use kprobe mechanism in (SuSE) Linux OS Now dynamic instrumentation, with the code of function designated position operation setting most of in linux kernel.

Mode 2) objective function kidnapped by the method for modifying specific structure pointer.

Comparatively, the advantages of mode 1, is that it is that kernel is formal, mechanism designed for this purpose, and limits item Part is few, covering surface is big；The advantages of mode 2, is will not to lose event, the expense of abduction almost without.

Therefore, when selecting abduction mode, different abduction modes can be selected according to the difference of objective function, with Just the expense of abduction is efficiently reduced, while achieving the purpose that reduce the system interference to destination server to the greatest extent.

It is illustrated by taking TCP transmission in linux system as an example below, specifically, the linux kernel function to be kidnapped can be with Including but not limited to following one:

B function: the TCP between client layer and protocol layer sends function, such as: tcp_sendmsg；

D function: TCP sends out the detection function before data segment, such as: tcp_v4_send_check；

F function: the function of unpacking that TCP is retransmitted, such as: tcp_fragment；

H function: TCP retransmits entrance function, such as: tcp_retransmit_skb.

It is mainly specifically described below with the abduction of B function:

B function is between application layer and TCP protocol layer, and parameter involved in B function may include: that user passes through application Program comes into the raw data packets of kernel, which is stored in the user's space of memory, can carry out to the function It kidnaps.

In view of B function is a hot spot function, therefore in manner just described 1 can not be adopted, further, because of B function Meet the condition of aforesaid way 2, therefore can be kidnapped with 2 pairs of B functions through the above way, that is, by modifying specific structure The method of pointer kidnaps objective function.

The modification to function is realized by using the mode for kidnapping function, can be modified on a large scale, be subtracted to avoid to system The system interference to destination server is lacked.

For example, linux kernel be in a manner of sock- > ops- > sendmsg () come call B function (that is, sock- > Ops- > sendmsg pointer is directed toward B function).Therefore, can first save sock- > ops- > sendmsg (i.e. B) is original tcp_ Sendmsg (i.e. following save_tcp_sendmsg) then, then will kidnap function (A function, my_tcp_sendmsg) assignment To sock- > ops- > sendmsg, to realize the abduction to B function.

This process can pass through following C language Implementation of pseudocode:

Inet_stream_ops=get_symbol_address_diting (" inet_stream_ops ")；

Save_tcp_sendmsg=inet_stream_ops- > sendmsg；//save_tcp_sendmsg=B

Inet_stream_ops- > sendmsg=my_tcp_sendmsg；//inet_stream_ops- > sendmsg= A

In this way, carrying out when kernel runs to the position of script B function and kidnapping function A, the realization logic of A function Are as follows:

A(parameter1,parameter2,…){

prepare job；The preparation of //A.1

B(parameter1,parameter2,…)；//A.2 calls directly corresponding original function B

ending job；The power cut-off of //A.3

}

Correspondingly, can by the other three kidnap function (C function, E function, G-function) respectively to D function, F function and H function is kidnapped.These three realization logics for kidnapping function can be divided into three parts as A function: first part * .1 It realizes and prepares code, second part * .2 calls directly original function；Part III * .3 realizes ending work.

The component part of above-mentioned abduction function is only a kind of schematic representation, when actually realizing, can also be used Other building forms, for example, only including: that first part * .1 realizes that preparing code and Part III * .3 realizes ending work. Which kind of can be selected according to actual needs using mode, the application is not construed as limiting this.

Similar with B function, D function can also be kidnapped with through the above way 2, specifically, can pass through data structure Pointer: ipv4_specific- > send_check calls D function.

For F function and H function, because being non-hot function, it is not available above-mentioned mode 2 and is kidnapped, it therefore, can To select aforesaid way 1 to kidnap F function and H function, that is, by being transported in the corresponding function designated position of linux kernel The code of row setting kidnaps objective function.

For increasing the magic number of 4 bytes and the Tag ID of 4 bytes in the data packet that client layer is sent, tie below Close Fig. 3 whole process is described, in Fig. 3, horizontal axis indicate the time, the longitudinal axis indicate 4 abduction functions: A function, C function, E function, G-function, this four abduction functions respectively correspond 4 original functions: B function, D function, F function, H function.Function it Between call relation (the called function of the object representations that arrow is directed toward) is indicated by vertical arrow.The vertical arrow table of dotted line Show that the calling does not occur every time, meeting Call Condition can just call.The * .1 in box, * .2 and * .3 difference in Fig. 1 Represent three parts of above-mentioned function structure logic.

It is as follows to 4 abduction function declarations respectively:

1) A function (my_tcp_sendmsg): the TCP between client layer and protocol layer sends the abduction function of function B.

A.1:prepare job (preparation):

A.1.1: 8, the head byte of scanning user's space datarams, if it is predetermined for scanning to preceding 4 byte Magic number, the then Tag ID being passed to rear 4 byte as user, the Tag ID storage that will acquire to the sk knot for representing present networks link In structure body；

A.1.2: determining that this sends function data length to be sent, sent out according to the addition stored in this sk structural body The TCP serial number for sending the last byte of queue calculates this and sends the corresponding TCP sequence number window of data；

A.1.3: the setting flag WRITE in this sk structural body；

A.2: calling original publication function B function；

A.3:ending job (power cut-off):

A.3.1: the case where handling B function Y traverses all skb on this sk structural body transmit queue, if currently processed Skb TCP serial number range within this TCP sequence number window for sending data A.1.2 recorded, then will A.1.1 record Tag ID is stored into currently processed skb structural body；

Wherein, sk is the sock data structure during (SuSE) Linux OS kernel TCP is realized, skb is (SuSE) Linux OS Sk_buff data structure in kernel TCP realization.Wherein, sk is included and this network linking for describing a network linking Relevant various information, such as: ip, port, mss, the rtt of link, serial number of currently giving out a contract for a project, the acknowledged sequence number received etc. Deng；Skb includes various information relevant with the data segment for describing network data section (segment), such as: notebook data section TCP serial number range, whether data length, the memory pointer where data, moment of giving out a contract for a project, this section retransmitted etc..

It, can be by finding useless field in sk data structure and skb data structure, for depositing when realizing Store up Tag ID.In tcp, certain sheet data can be referred to by segment (section), number can be passed through for upper level applications It is referred to according to packet.The data packet on one upper layer may correspond to multiple TCP data sections, and a TCP data section may also correspond to multiple Upper layer data packet.

A.3.2: label WRITE is removed in this sk structural body；

2) B function (tcp_sendmsg): the TCP between client layer and protocol layer sends function.

Detect on transmit queue whether there are also remaining spaces in the last one skb packet, if there is remaining space, then by this The data copy of transmission is entered, if remaining space is not enough to accommodate all data of this transmission, distributes new skb to hold Receive remaining data volume to be sent；

It detects whether that data can be sent at once, if data can be sent at once, just sends a skb immediately, otherwise Other opportunity is waited to retransmit.Therefore, when executing, (one or several) skb (situation X, processing can be sent immediately See C.1.1), it can also be when handling this transmission function, (one or several) skb, which is stayed in transmit queue, wouldn't send (feelings A.3.1 condition Y, processing are shown in).

3) the abduction function of the detection function D function before C function (my_tcp_send_check): TCP hair data segment.

The TCP object finally to be sent is skb, and the function for sending skb needs to call D function, in this example, can be used C function kidnaps D function.Wherein, it is similar with the situation X kidnapped in B function by A function that D function is kidnapped by C function.

C.1:prepare job (preparation):

C.1.1: if there are WRITE labels on the case where handling above-mentioned B function X-- sk structural body, and this skb is new It sends out section rather than retransmitted segment, then the Tag ID stored on sk structural body is stored on this skb structural body.Wherein it is determined that skb whether It is that new hair section can be compared to by the last TCP serial number of this skb with next TCP Segment beginning sequence number value to be sent on sk etc. Judgement.

Further, because of the original skb that skb majority of case is this function parameter (clone) skb, therefore, it is possible to judge that It whether is clone, to ensure Tag ID there are original skb structural body rather than on the skb structural body of clone.

C.1.2: processing TCP unpacks situation because TCP when sending data, understand due to some (such as: window Mouthful limitation etc.) skb splitted into two to send.Therefore, whether the next field that can detecte original skb is effective Skb, if so, and the next skb there is no recording mark ID, then just by the Tag ID storage on original skb to next skb On structural body so that Tag ID can be carried on skb so that for each skb can identify its with Corresponding relationship between raw data packets；

C.2: calling original inspection function D function；

C.3:ending job (power cut-off): empty.

4) detection function before D function (tcp_v4_send_check): TCP hair data segment.

5) the abduction function of G-function (mytcp_retransmit_skb): TCP re-transmission entrance function H function.

G.1:prepare job (preparation): empty；

G.2: calling original re-transmission function H function；

G.3:ending job (power cut-off): checking H function, if successfully transmitting a re-transmission skb, output pair The event answered, specifically, some information on re-transmission skb can be exported, such as: event generation time, the link congestion State of a control, the port ip four-tuple, sk pointer, TCP serial number range, scoreboard, rto, srtt, rttvar etc. and Tag ID Deng.

Wherein, event may refer to processor and run to certain appointment codes point in the field Tracing of computer science When, a series of operation is triggered in the condition of code point setting in advance due to meeting, these operations have identifiability.Example Such as: user sets Boolean variable in program code somewhere in advance, when processor runs to this position, and detects that the boolean becomes When amount is true, so that it may trigger event, thereby executing a series of preset operations.The operation of execution can be record event Relevant information, such as: other data etc. that event title, event generation time, Thread Id, event carry.

6) H function (tcp_retransmit_skb): TCP entrance function is retransmitted, TCP calls the function to retransmit skb.

It unpacks if necessary, then H function, which calls, retransmits function F function of unpacking, and then first calls E function.In addition, working as TCP When really determining to retransmit some skb, TCP can be called to send out the detection function D function before data segment, to first call C letter Number.But because no WRITE is marked on sk, C.1.1 part will not be entered.

7) the abduction function of E function (my_tcp_fragment): the TCP function F function of unpacking retransmitted, for handling weight When biography is unpacked the case where unloading Tag ID.

E.1prepare job (preparation): empty；

E.2 original re-transmission is called to unpack function F function；

Whether the next field for E.3 checking original skb is effective skb, if so, and the next skb do not record mark Remember ID, then it will be in the Tag ID storage to next skb structural body of this skb.

8) F function (tcp_fragment): the TCP function of unpacking retransmitted.

In upper example, client layer application program records a 4 byte evil spirit numbers and 4 words on the head of hair data packet every time Shackle mark ID can then export the corresponding client layer application of the retransmitted segment when detecting that linux kernel TCP retransmits certain data segment The Tag ID of program data packet.May determine that client layer application program certain data packet by the Tag ID, (such as one asked Ask) network high latency or time-out whether be because Network Abnormal caused by.Further, it avoids as far as possible with kprobe mechanism pair Kernel hot spot function instrumentation, avoids carrying out overweight operation in hotspot path.Therefore, to goal systems Interfere it is extremely low, and not will cause event loss.Event is not generated in hot spot, therefore, the result data amount finally generated is small, target Cost all very littles of the storage of system, transmission cost and subsequent analysis, and kernel source code is not modified, machine can not restarted In the case where come into force.

Embodiment of the method provided by the embodiment of the present application can be in mobile terminal, terminal, server or class As execute in arithmetic unit.For running on the server, Fig. 4 is a kind of data transmission method of the embodiment of the present invention The hardware block diagram of server.As shown in figure 4, server 10 may include one or more (only showing one in figure) processing Device 102 (processing unit that processor 102 can include but is not limited to Micro-processor MCV or programmable logic device FPGA etc.), Memory 104 for storing data and the transmission module 106 for communication function.Those of ordinary skill in the art can be with Understand, structure shown in Fig. 4 is only to illustrate, and does not cause to limit to the structure of above-mentioned electronic device.For example, server 10 is also It may include more perhaps less component or with the configuration different from shown in Fig. 4 than shown in Fig. 4.

Memory 104 can be used for storing the software program and module of application software, such as the data in the embodiment of the present invention Corresponding program instruction/the module of transmission method, processor 102 by the software program that is stored in memory 104 of operation and Module realizes above-mentioned data transmission method thereby executing various function application and data processing.Memory 104 may include High speed random access memory, may also include nonvolatile memory, as one or more magnetic storage device, flash memory or its His non-volatile solid state memory.In some instances, memory 104 can further comprise remotely setting relative to processor 102 The memory set, these remote memories can pass through network connection to terminal 10.The example of above-mentioned network include but It is not limited to internet, intranet, local area network, mobile radio communication and combinations thereof.

Transmission module 106 is used to that data to be received or sent via a network.Above-mentioned network specific example may include The wireless network that the communication providers of terminal 10 provide.In an example, transmission module 106 includes that a network is suitable Orchestration (Network Interface Controller, NIC), can be connected by base station with other network equipments so as to Internet is communicated.In an example, transmission module 106 can be radio frequency (Radio Frequency, RF) module, For wirelessly being communicated with internet.

Referring to FIG. 5, data transmission method may include generation unit 501, transmission unit in Software Implementation 502, acquiring unit 503 and determination unit 504.Wherein:

Generation unit 501, for identification field to be added in the packet header that client layer is data to be transmitted packet, to generate transmission number According to, wherein the identification field is for data to be transmitted packet described in unique identification；

Transmission unit 502, for transmitting the transmission data by protocol layer；

Acquiring unit 503, for obtaining the data being retransmitted, and the corresponding identifier word of data being retransmitted described in extraction Section；

Determination unit 504 determines the data of client layer belonging to the data being retransmitted for the identification field according to extraction Packet.

In one embodiment, generation unit 501 specifically can be used in the addition of the packet header of the data to be transmitted packet Indicate information and identification field, wherein the instruction information is located at before the identification field, is used to indicate the instruction information Subsequent field is identification field.

In one embodiment, transmission unit 502 specifically can be used for through the TCP hair between client layer and protocol layer Detection function before sending function and TCP to send out data segment sends the transmission data.

In one embodiment, transmission unit 502 sends function and TCP by the TCP between client layer and protocol layer Detection function before sending out data segment sends the transmission data, may include: to kidnap the user by modifying structured fingers TCP between layer and protocol layer sends the detection function before function and TCP hair data segment, to send the transmission number According to.

In one embodiment, acquiring unit 503 is specifically used for that entrance function re-transmission data can be retransmitted by TCP； Successful re-transmission data are determined whether by TCP function of unpacking；In the case where determination has retransmitted data, the number being retransmitted is obtained According to.

In one embodiment, entrance function is retransmitted by TCP and retransmits data, may include: to carry to send by skb Data are retransmitted, wherein the identification field is also carried in the skb.

Although this application provides the method operating procedure as described in embodiment or flow chart, based on conventional or noninvasive The labour for the property made may include more or less operating procedure.The step of enumerating in embodiment sequence is only numerous steps One of execution sequence mode, does not represent and unique executes sequence.It, can when device or client production in practice executes To execute or parallel execute (such as at parallel processor or multithreading according to embodiment or method shown in the drawings sequence The environment of reason).

The device or module that above-described embodiment illustrates can specifically realize by computer chip or entity, or by having The product of certain function is realized.For convenience of description, it is divided into various modules when description apparatus above with function to describe respectively. The function of each module can be realized in the same or multiple software and or hardware when implementing the application.It is of course also possible to Realization the module for realizing certain function is combined by multiple submodule or subelement.

Method, apparatus or module described herein can realize that controller is pressed in a manner of computer readable program code Any mode appropriate is realized, for example, controller can take such as microprocessor or processor and storage can be by (micro-) The computer-readable medium of computer readable program code (such as software or firmware) that processor executes, logic gate, switch, specially With integrated circuit (Application Specific Integrated Circuit, ASIC), programmable logic controller (PLC) and embedding Enter the form of microcontroller, the example of controller includes but is not limited to following microcontroller: ARC 625D, Atmel AT91SAM, Microchip PIC18F26K20 and Silicone Labs C8051F320, Memory Controller are also implemented as depositing A part of the control logic of reservoir.It is also known in the art that in addition to real in a manner of pure computer readable program code Other than existing controller, completely can by by method and step carry out programming in logic come so that controller with logic gate, switch, dedicated The form of integrated circuit, programmable logic controller (PLC) and insertion microcontroller etc. realizes identical function.Therefore this controller It is considered a kind of hardware component, and hardware can also be considered as to the device for realizing various functions that its inside includes Structure in component.Or even, it can will be considered as the software either implementation method for realizing the device of various functions Module can be the structure in hardware component again.

Part of module in herein described device can be in the general of computer executable instructions Upper and lower described in the text, such as program module.Generally, program module includes executing particular task or realization specific abstract data class The routine of type, programs, objects, component, data structure, class etc..The application can also be practiced in a distributed computing environment, In these distributed computing environment, by executing task by the connected remote processing devices of communication network.In distribution It calculates in environment, program module can be located in the local and remote computer storage media including storage equipment.

As seen through the above description of the embodiments, those skilled in the art can be understood that the application can It is realized by the mode of software plus required hardware.Based on this understanding, the technical solution of the application is substantially in other words The part that contributes to existing technology can be embodied in the form of software products, and can also pass through the implementation of Data Migration It embodies in the process.The computer software product can store in storage medium, such as ROM/RAM, magnetic disk, CD, packet Some instructions are included to use so that a computer equipment (can be personal computer, mobile terminal, server or network are set It is standby etc.) execute method described in certain parts of each embodiment of the application or embodiment.

Each embodiment in this specification is described in a progressive manner, the same or similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.The whole of the application or Person part can be used in numerous general or special purpose computing system environments or configuration.Such as: personal computer, server calculate Machine, handheld device or portable device, mobile communication terminal, multicomputer system, based on microprocessor are at laptop device System, programmable electronic equipment, network PC, minicomputer, mainframe computer, the distribution including any of the above system or equipment Formula calculates environment etc..

Although depicting the application by embodiment, it will be appreciated by the skilled addressee that the application there are many deformation and Variation is without departing from spirit herein, it is desirable to which the attached claims include these deformations and change without departing from the application's Spirit.

Claims

1. a kind of data transmission method, which is characterized in that the described method includes:

Identification field is added in the packet header that client layer is data to be transmitted packet, to generate transmission data, wherein the identification field For data to be transmitted packet described in unique identification；

The transmission data are transmitted by protocol layer；

2. the method according to claim 1, wherein mark is added in the packet header that client layer is data to be transmitted packet Field, to generate transmission data, comprising:

Instruction information and identification field is added in the packet header of the data to be transmitted packet, wherein the instruction information is located at described Before identification field, being used to indicate the subsequent field of the instruction information is identification field.

3. the method according to claim 1, wherein transmitting the transmission data by protocol layer, comprising:

The transmission data are transmitted by Transmission Control Protocol；

Correspondingly, obtaining the data being retransmitted includes: the data for obtaining and being retransmitted under Transmission Control Protocol.

4. according to the method described in claim 3, it is characterized in that, transmitting the transmission data by Transmission Control Protocol, comprising:

Detection function before sending function and TCP hair data segment by the TCP between client layer and protocol layer sends the hair Send data.

5. according to the method described in claim 4, it is characterized in that, sending function by the TCP between client layer and protocol layer Detection function before sending out data segment with TCP sends the transmission data, comprising:

By modifying structured fingers, kidnaps the TCP between the client layer and protocol layer and send function and TCP hair data segment Detection function before, to send the transmission data.

6. according to the method described in claim 3, it is characterized in that, obtaining the data being retransmitted under Transmission Control Protocol, comprising:

Entrance function, which is retransmitted, by TCP retransmits data；

Successful re-transmission data are determined whether by TCP function of unpacking；

In the case where determination has retransmitted data, the data being retransmitted are obtained.

7. according to the method described in claim 6, it is characterized in that, retransmitting entrance function by TCP retransmits data, comprising:

It carries transmission data by skb to be retransmitted, wherein also carry the identification field in the skb.

8. a kind of data end equipment, including processor and for the memory of storage processor executable instruction, the processing Device realizes following steps when executing described instruction:

The transmission data are transmitted by protocol layer；

9. equipment according to claim 8, which is characterized in that mark is added in the packet header that client layer is data to be transmitted packet Field, to generate transmission data, comprising:

10. equipment according to claim 8, which is characterized in that transmit the transmission data by protocol layer, comprising:

The transmission data are transmitted by Transmission Control Protocol；

11. equipment according to claim 10, which is characterized in that transmit the transmission data by Transmission Control Protocol, comprising:

12. equipment according to claim 11, which is characterized in that send letter by the TCP between client layer and protocol layer Detection function before several and TCP hair data segment sends the transmission data, comprising:

13. equipment according to claim 9, which is characterized in that obtain the data being retransmitted under Transmission Control Protocol, comprising:

Entrance function, which is retransmitted, by TCP retransmits data；

14. equipment according to claim 13, which is characterized in that retransmit entrance function by TCP and retransmit data, comprising:

15. a kind of computer readable storage medium is stored thereon with computer instruction, described instruction, which is performed, realizes that right is wanted The step of seeking any one of 1 to 7 the method.