CN103259880B - Under a kind of netfilter framework, connect the optimization method of following the tracks of - Google Patents
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Abstract
The invention provides the optimization method that connects tracking under a kind of netfilter framework, comprise: define and initialize current connection and follow the tracks of number M, maximum connection tracking number Mmax, the current connection tracking number N having applied for, the maximum connection tracking number Nmax applying for, Nmax > Mmax; In the time that new application connects tracking, N adds 1, judges M > Mmax, if so, carries out creating new connection tracking after burin-in process; If not, judge N > Nmax, if return to mistake, create if not new connection and follow the tracks of; After the connection of new application is followed the tracks of and confirmed, M adds 1, and is added to confirm to connect and follow the tracks of chained list. The embodiment of the present invention has ensured the quantity that effective connection is followed the tracks of; Optimize abnormality processing; Clear and definite connect to follow the tracks of at alloc initialize the responsibility of confirming two stages with confirm; Ensured normal online, the resource that when download, speed is good also can well retain.
Description
Technical field
The present invention relates to network communications technology field, particularly relate to the optimization method that connects tracking under a kind of netfilter framework.
Background technology
Current domestic majority of network CPE(subscriber terminal equipment) code framework be all based on Linux, and netfilter is also and the network core processing layer of its standard configuration. But along with the speed of active user to network and the raising of quality requirement, the code of netfilter own starts to manifest problem, for connecting tracking aspect, main manifestations is:
1), when multi-user BT downloads, user cannot normally surf the Net;
2), when multi-user BT downloads, user uses the quality of services such as voice and video obviously decline or disconnect;
3), when multi-user BT downloads, user or office side cannot normally manage CPE by network mode;
4) the new abnormal problem connecting of network C PE development of user more difficult a large amount of initiations under netfilter framework.
Connecting tracking and be used for following the tracks of and recording connection status, is a part of netfilter, also by carrying out work in the corresponding structure of the upper registration of hook point (readjustment point).
No matter be the packet that sends, receives or forward, all will connect and follow the tracks of through two conntrack() point:
1) NF_IP_PRI_CONNTRACK(application connects tracking)
The priority that NF_IP_PRI_CONNTRACKconntrack is ordered is the highest, and first all packets all can be processed by it after entering netfilter, and its effect is to create ip_conntrack structure;
2) NF_IP_PRI_CONNTRACK_CONFIRM(confirms to connect tracking)
The priority that NF_IP_PRI_CONNTRACK_CONFIRMconntrack is ordered is minimum, always before packet leaves netfilter, does last processing, and one of its effect is that the connection tracking structure of this packet is added in the connection tracking chained list of system.
Particularly, mainly there is the problem of following two aspects in current connection tracking mode:
(1) number is followed the tracks of in the current connection of nf_conntrack_count() statistical
Nf_conntrack_count applies at alloc() connect while tracking and add, this will reduce the quantity that effective connection is followed the tracks of. As shown in Figure 1, because some has been applied for connecting the packet of following the tracks of and finally can abandoned in handling process by netfilter or forget, this will cause the effective tracking number that connects to be less than the maximum tracking number that connects of nf_conntrack_max() restriction, this is also why majority feed back the reason of " value of nf_conntrack_count is not 0, follows the tracks of but can't see any connection under/proc/net/nf_conntrack ".
(2) aging mechanism when nf_conntrack_count exceedes nf_conntrack_max restriction
Aging mechanism when nf_conntrack_count exceedes nf_conntrack_max restriction adopts the early_drop mode of kernel standard, the connection under non-IPS_ASSURED_BIT state (being non-acknowledgement state) is followed the tracks of to random selective liberation, concrete grammar as shown in Figure 2. This random selective liberation mode has been not suitable with current BT and has downloaded more and more general actual environment, the propelling of especially many net unifications, and main manifestations is: 1. cannot normally move by the means of network management gateway; 2. there is the situation of poor signal quality, cutout in the real-time streams such as audio frequency and video; 3. normal online cannot be responded, and the resource that when download, speed is good does not well retain.
Summary of the invention
The object of the present invention is to provide under a kind of netfilter framework and connect the optimization method of following the tracks of, connect the statistical of following the tracks of number by optimization, increase and effectively connect the quantity of following the tracks of.
The object of the invention is to be achieved through the following technical solutions.
Under netfilter framework, connect an optimization method of following the tracks of, comprising:
Define and initialize current connection and follow the tracks of the connection tracking number Nmax of number M, maximum connection tracking number Mmax, the current connection tracking number N having applied for, maximum application, Nmax > Mmax;
In the time that new application connects tracking, the value that the current connection of having applied for is followed the tracks of to number N adds 1, judge whether afterwards M > Mmax, if so, from confirmed connection is followed the tracks of, select to connect to follow the tracks of and carry out following the tracks of for current data stream creates new connection after burin-in process; If not, judge whether N > Nmax, if do not follow the tracks of and return mistake for current data stream creates to connect, follow the tracks of and return successfully for current data stream creates new connection if not;
Connection for new application is followed the tracks of, judge whether it meets confirmation condition, the value of current connection tracking number M is added to 1 if meet confirmation condition, and the connection tracking of this confirmation is added and confirms to connect tracking chained list, carry out successively protocol stack subsequent processes to confirming to connect the connection tracking of following the tracks of in chained list.
In said method, also comprise at initial phase: type is followed the tracks of in the default connection that needs reservation, and the vacant connection tracking that retains specified quantity is in order to belong to the establishment that needs the connection of the connection tracking type retaining to follow the tracks of; Create LRU chained list, this LRU chained list has comprised to meet described confirmation condition and do not belong to needs the connection retaining to follow the tracks of the connection tracking of type;
The step of described burin-in process comprises:
A, judge current application connection follow the tracks of whether belong to need retain connection follow the tracks of type, if, continue judge current that applied for and belong to need to retain and connect the connection tracking quantity of following the tracks of type and whether exceed specified quantity, while not exceeding, be that the new connection of current data stream establishment is followed the tracks of and returned successfully, while exceeding, perform step B; If not, execution step B;
B, judge that whether LRU chained list is empty, if it is empty, returns to failure; If not empty, select a wherein connection to follow the tracks of and discharge, follow the tracks of and return successfully for current data stream creates new connection afterwards.
In said method, the described connection that needs to retain is followed the tracks of type and is comprised: with Linux local interaction data flow mutual set up be connected trackings, the tracking that is connected for the voice of RTSP, H323, SIP, multicast type and video foundation.
In said method, judge that the fill method of LRU chained list is: the connection of the confirmation newly creating is followed the tracks of to the afterbody that is added in successively LRU chained list as node;
In subsequent process, have data packet transmission if connect in LRU chained list to follow the tracks of, this node moves to afterbody.
In said method, in described step B, in selection LRU chained list, first is not followed the tracks of and discharges for connection corresponding to empty node.
In said method, also comprise the step that release connection is followed the tracks of, this step comprises:
In the time that release connection is followed the tracks of, the value that the current connection of having applied for is followed the tracks of to number N subtracts 1; If the connection of current release is tracked as committed state, the value of current connection being followed the tracks of to number M subtracts 1.
In said method, the specified quantity that the vacant connection of reservation is followed the tracks of is set to 100.
In said method, the connection of maximum application is followed the tracks of maximum connection of number Nmax=and is followed the tracks of number Mmax × 2.
Compared with prior art, the embodiment of the present invention has following beneficial effect:
The embodiment of the present invention connects tracking number simultaneously statistical and aging mechanism to optimizing are optimized respectively, have ensured the quantity that effective connection is followed the tracks of; Optimize and aspect internal memory, connected the abnormality processing of following the tracks of; Clear and definite connect to follow the tracks of at alloc initialize the responsibility of confirming two stages with confirm, what prevent that developer from using obscures; Ensure that existing local interaction, video/audio connect tracking and be not extruded; Ensure the priority of the tracking of the connection for local interaction, video/audio of new establishment; Ensured normal online, the resource that when download, speed is good also can well retain.
Brief description of the drawings
Fig. 1 is the statistical method flow chart for current connection tracking number that prior art adopts.
Fig. 2 is the burin-in process flow chart of the early_drop mode of prior art employing.
Fig. 3 is the statistical method flow chart for current connection tracking number that the embodiment of the present invention provides.
Fig. 4 is the burin-in process flow chart of the base+LRU+reserve mode that provides of the embodiment of the present invention.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated. Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
(1) optimize and improve of number nf_conntrack_count statistical is followed the tracks of in current connection:
As shown in table 1 below, " increase of nf_conntrack_count is added up from application connection tracking readjustment and is changed application connection tracking readjustment point into, and restricted number has been applied in increase ".
Table 1
| Connect and follow the tracks of number nf_conntrack_count statistical | The change of statistics |
| Standard kernel mode | Application connects tracking readjustment point to be increased |
| Improve and optimize | Readjustment point is followed the tracks of in application connection to be increased, and restricted number has been applied in increase |
Adding of " having applied for restricted number " and process be for prevent kernel itself to connect follow the tracks of processing when abnormal (such as being subject to the network attacks such as syn, such as leak is followed the tracks of in effective connection that the QOS application of IMQ queue brings, connect the concurrent processing followed the tracks of etc. such as a large amount of) bring abnormal memory consumption.
Definition nf_conntrack_alloc_count is that number is followed the tracks of in the current connection of having applied for, nf_conntrack_alloc_max is that maximum connection tracking number, the nf_conntrack_count applying for is that number is followed the tracks of in current connection, nf_conntrack_max is maximum connection tracking number, the scope of nf_conntrack_alloc_max value is > nf_conntrack_max, advise that its value is for (2*nf_conntrack_max), concrete statistical method as shown in Figure 3, comprises step:
301, while having new connection tracking application, nf_conntrack_alloc_count is added to 1, compare afterwards the magnitude relationship of nf_conntrack_count and nf_conntrack_max, nf_conntrack_alloc_count and nf_conntrack_alloc_max and handle accordingly.
In this step, concrete processing method is:
In the time that nf_conntrack_count is greater than nf_conntrack_max, from confirmed connection is followed the tracks of, selects to connect to follow the tracks of and carry out following the tracks of (specifically as described later) for current data stream creates new connection after burin-in process;
In the time that nf_conntrack_count is not more than nf_conntrack_max: if nf_conntrack_alloc_count is greater than nf_conntrack_alloc_max, do not follow the tracks of and return mistake for current data stream creates to connect; If nf_conntrack_alloc_count is not more than nf_conntrack_alloc_max, follows the tracks of and return successfully for current data stream creates new connection.
302, the connection of current application is followed the tracks of to the middle a lot of hooks points of process and processed, this processing procedure may cause the connection tracking of application abandon or forget.
303, after confirming that connection is followed the tracks of, nf_conntrack_count is added to 1, and the connection of this confirmation is followed the tracks of to add to connect and follow the tracks of chained list, proc/net/nf_conntrack reflects all connections tracking of this chained list.
In the present embodiment, in the time that following the tracks of, release connection also needs to carry out following processing:
For nf_conntrack_count: if current connection is tracked as confirm state, nf_conntrack_count is subtracted to 1;
For nf_conntrack_alloc_count: nf_conntrack_alloc_count is subtracted to 1.
Compared with prior art, the statistical that number is followed the tracks of in the current connection that the present embodiment provides has the following advantages:
Ensure the quantity that effective connection is followed the tracks of; Optimize and aspect internal memory, connected the abnormality processing of following the tracks of; Clear and definite connect to follow the tracks of in alloc application initialize the responsibility of confirming two stages with confirm, what prevent that developer from using obscures.
(2) optimize and improve of aging mechanism when nf_conntrack_count exceedes nf_conntrack_max restriction:
As shown in table 2 below, and " nf_conntrack_count exceedes the aging mechanism in nf_conntrack_max when restriction from adopting early_drop mode to adopting base+LRU+reserve mode, with search can be aging connection follow the tracks of discharge ".
Table 2
| Connect tracking number and exceed nf_conntrack_max restriction aging mechanism | The change of implementation |
| Standard kernel mode | Early_drop mode |
| Improve and optimize | Base+LRU+reserve mode |
In the present embodiment, base+LRU+reserve mode comprises:
（1）base：
Because always there are some connect that to follow the tracks of be that we must remain and allow its normal aging, so in the present embodiment, it is that the connection of base type is followed the tracks of that this class is connected to track definition, mainly comprises following a few class:
1. with Linux local interaction data flow mutual set up be connected trackings, be mainly the connection tracking of " well-known port+Linux local service expand serve port+this locality first initiate ";
2. be the voice of the types such as RTSP, H323, SIP, multicast and the tracking that is connected of video foundation.
(2) LRU(LRU):
Connect in order to allow the data flow service that resource is good that is tracked as, employing LRU mode is searched connection that can be aging and is followed the tracks of, and this needs an independent chained list organize current those connections that do not belong to base type to follow the tracks of, and in the present embodiment, defining this chained list is LRU chained list.
The fill method of LRU chained list is specially: the connection that the confirm newly creating is crossed is followed the tracks of and is added in LRU chained list afterbody as node; There is data packet transmission if the connection of follow-up correspondence is followed the tracks of, corresponding node is moved to LRU chained list afterbody.
Connection to be aging is followed the tracks of: first that search current LRU chained list is for connection corresponding to empty node followed the tracks of.
（3）reserve：
The establishment that connects tracking for base type is followed the tracks of in the vacant connection that will retain specified quantity (being reserve value) in the present embodiment, and this value suggestion is 100.
As shown in Figure 4, the burin-in process process that the present embodiment adopts base+LRU+reserve mode to realize is:
401, judge whether nf_conntrack_count exceedes nf_conntrack_max, if not, create new connection and follow the tracks of and return successfully; If so, carry out next step.
402, judge whether nf_conntrack_alloc_count exceedes nf_conntrack_alloc_max, if so, return to failure; If not, carry out next step.
403, judge whether connection tracking current to be applied for belongs to base type and connect tracking, if so, performs step 404; If not, perform step 405.
404, judge that whether connection tracking quantity current to be applied for exceedes reserve value, if so, performs step 405; If not, creating new connection follows the tracks of and returns successfully.
405, judge that whether LRU chained list is empty, if it is empty, returns to failure; If not empty, wherein first is not followed the tracks of and discharges for connection corresponding to empty node in selection, creates afterwards new connection and follows the tracks of and return successfully.
Compared with existing early_drop mode, in the present embodiment, aging mechanism has the following advantages:
Transfinite in the situation that processed connecting to follow the tracks of,
1) ensured that existing local interaction, video/audio connect tracking and be not extruded;
2) ensured new establishment the connection for local interaction, video/audio follow the tracks of priority;
3) ensured normal online, the resource that when download, speed is good also can well retain.
To sum up, new nf_conntrack_count statistical and aging mechanism that the present embodiment adopts have solved the existing technological deficiency of prior art, but for the confined equipment of speed, if the flow that user asks is greater than total speed, also need to coordinate and could meet above demand with functions such as QOS, optimize because the present invention only relates to connecting to follow the tracks of, be not repeated here.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. under netfilter framework, connect an optimization method of following the tracks of, it is characterized in that, the method comprises:Defining and initialize current connection follows the tracks of number M, maximum connection follows the tracks of number Mmax, the current connection of having applied forFollow the tracks of the connection of number N, maximum application and follow the tracks of number Nmax, Nmax > Mmax; Connect and follow in new applicationWhen track, the value that the current connection of having applied for is followed the tracks of to number N adds 1, judges whether afterwards M > Mmax, asFruit is that from confirmed connection is followed the tracks of, select connection to follow the tracks of carrying out after burin-in process is current data stream woundBuilding new connection follows the tracks of; If not, judge whether N > Nmax, if be not current data stream woundBuild to connect and follow the tracks of and return mistake, follow the tracks of and return successfully for current data stream creates new connection if not;Connection for new application is followed the tracks of, and judges whether it meets confirmation condition, if meet confirmation condition by currentThe value that connects tracking number M adds 1, and the connection of this confirmation is followed the tracks of to add to confirm to connect and follow the tracks of chained list, rightConfirm to connect the connection tracking of following the tracks of in chained list and carried out successively protocol stack subsequent processes; In the method initiallyThe change stage also comprises: type is followed the tracks of in the default connection that needs reservation, and retains the vacant connection tracking of specified quantityIn order to belong to the establishment that needs the connection retaining to follow the tracks of the connection tracking of type; Create LRU chained list, this LRUChained list has comprised to meet described confirmation condition and do not belong to needs the connection retaining to follow the tracks of the connection tracking of type; InstituteThe step of stating burin-in process comprises:
A, judge current application connection follow the tracks of whether belong to need retain connection follow the tracks of type, if so,Continue judge current that applied for and belong to need to retain and connect the connection tracking quantity of following the tracks of type and whether exceed fingerDetermined number, is that the new connection of current data stream establishment is followed the tracks of and returned successfully while not exceeding, carries out step while exceedingRapid B; If not, execution step B;
B, judge that whether LRU chained list is empty, if it is empty, returns to failure; If not empty, select itIn one connect to follow the tracks of and discharge, afterwards for the new connection of current data stream establishment is followed the tracks of and is returned successfully.
2. under netfilter framework, connect the optimization method of following the tracks of as claimed in claim 1, it is characterized in that,The described connection tracking type retaining that needs comprises: follow with mutual being connected of setting up of Linux local interaction data flowTrack, be the voice of RTSP, H323, SIP, multicast type and video set up be connected tracking.
3. under netfilter framework, connect the optimization method of following the tracks of as claimed in claim 1, it is characterized in that,The fill method that judges LRU chained list is: the connection of the confirmation newly creating is followed the tracks of and is added in successively as nodeThe afterbody of LRU chained list; In subsequent process, there is data packet transmission if connect in LRU chained list to follow the tracks of, shouldNode moves to afterbody.
4. under netfilter framework, connect the optimization method of following the tracks of as claimed in claim 3, it is characterized in that,In described step B, in selection LRU chained list, first is not followed the tracks of and releases for connection corresponding to empty nodePut.
5. under netfilter framework, connect the optimization method of following the tracks of as claimed in claim 1, it is characterized in that,In the method, also comprise the step that release connection is followed the tracks of, this step comprises: in the time that release connection is followed the tracks of, and oughtBefore the connection the applied for value of following the tracks of number N subtract 1; If the connection of current release is tracked as committed state,The value of current connection being followed the tracks of to number M subtracts 1.
6. under netfilter framework, connect the optimization method of following the tracks of as claimed in claim 3, it is characterized in that,In the method, the specified quantity that the vacant connection of reservation is followed the tracks of is set to 100.
7. under netfilter framework, connect the optimization method of following the tracks of as claimed in claim 1, it is characterized in that,The connection of maximum application is followed the tracks of maximum connection of number Nmax=and is followed the tracks of number Mmax × 2.
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| CN106027419B (en) * | 2016-05-20 | 2019-06-04 | 曙光云计算技术(日照)有限公司 | A kind of management method and device of data structure |
| CN109729059B (en) | 2017-10-31 | 2020-08-14 | 华为技术有限公司 | Data processing method and device and computer |
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| WO2001093517A1 (en) * | 2000-05-30 | 2001-12-06 | Anyusernet Corporation | Telephone number assigning method of internet phone |
| CN101635639A (en) * | 2008-11-28 | 2010-01-27 | 北京网康科技有限公司 | Network connection tracing method and system thereof |
| CN102368769A (en) * | 2011-10-17 | 2012-03-07 | 深圳市共进电子股份有限公司 | Service quality guarantee method of network application under Linux network framework |
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| WO2001093517A1 (en) * | 2000-05-30 | 2001-12-06 | Anyusernet Corporation | Telephone number assigning method of internet phone |
| CN101635639A (en) * | 2008-11-28 | 2010-01-27 | 北京网康科技有限公司 | Network connection tracing method and system thereof |
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