CN103297311A - Method and device for achieving control and provision for wireless access point protocol (CAPWAP) data tunnels - Google Patents

Method and device for achieving control and provision for wireless access point protocol (CAPWAP) data tunnels Download PDF

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Publication number
CN103297311A
CN103297311A CN2013102576891A CN201310257689A CN103297311A CN 103297311 A CN103297311 A CN 103297311A CN 2013102576891 A CN2013102576891 A CN 2013102576891A CN 201310257689 A CN201310257689 A CN 201310257689A CN 103297311 A CN103297311 A CN 103297311A
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capwap
packet
upstream data
information
protocol stack
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王茂斌
吴明津
左延麟
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Comba Network Systems Co Ltd
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Comba Telecom Systems China Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Abstract

The invention discloses a method and a device for achieving CAPWAP data tunnels and is used for solving the problems that the consumed time for data transmission is long and the transmission efficiencies are low caused by the fact that the CAPWAP data tunnels are achieved through application layer protocols in the prior art. The CAPWAP data tunnels are configured for a wireless terminal underlying protocol stack and a wired terminal underlying protocol stack of a wireless terminal point (WTP) according to configuration parameters from an access control (AC). Besides, the wireless terminal underlying protocol stack receives uplink data packets from a station, and the wired terminal underlying protocol stack encapsulates the uplink data packets into uplink CAPWAP data packets and sends the uplink CAPWAP data packets to the AC through the configured CAPWAP data tunnels; the wired terminal underlying protocol stack receives downlink CAPWAP data packets from the AC through the configured CAPWAP data tunnels and decapsulates the downlink CAPWAP data packets into downlink data packets; and the wireless terminal underlying protocol stack sends the downlink data packets to the station.

Description

Wireless access point control and implementation method and the device in protocol data tunnel are provided
Technical field
The present invention relates to wireless communication system, particularly, relate to a kind of wireless access point control and implementation method and the device of agreement (CAPWAP, Control and Provision for Wireless Access Point Protocol) data tunnel are provided.
Background technology
CAPWAP is a kind of thin WAP (wireless access point) (WTP that is applied in, Wireless Terminal Point) and access controller (AC, Access Control) tunnel between, the CAPWAP protocol definition how to communicate between WTP and the AC, and for realizing that the interoperability between WTP and the AC provides a general encapsulation and transmission mechanism.
Fig. 1 shows the structure of the WLAN (wireless local area network) of thin WTP and AC formation, and WTP inserts website by wireless mode, and (STA, Station), the CAPWAP by wired mode between WTP and the AC communicates.Particularly, set up CAPWAP control tunnel between WTP and AC, download configuration parameters such as software version, radio frequency, power from AC by this CAPWAP control tunnel, utilize these information to carry out corresponding configuration after, and set up the CAPWAP data tunnel between AC.
But in present technology about the CAPWAP data tunnel, after normally the underlying protocol layer of WTP receives data, after the application layer protocol stack that data are sent to CAPWAP carries out the data dissection process, data after will being resolved by application layer again return to the CAPWAP data Layer, the underlying protocol layer sends the data after resolving, also namely realize data tunnel by application layer protocol, the time loss that so just causes data to send is long, the problem that transmitting efficiency is low.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of implementation method and device of CAPWAP data tunnel, realizes that by application layer protocol data tunnel causes the time loss of data transmission long, the problem that transmitting efficiency is low in order to solve in the prior art.
Embodiment of the invention technical scheme is as follows:
A kind of wireless access point control and agreement CAPWAP is provided the implementation method of data tunnel, comprise: WAP (wireless access point) WTP receives the configuration parameter from access controller AC, and the wireless side underlying protocol stack of WTP and wired bottom layer protocol stack are according to configuration parameter configuration CAPWAP data tunnel; The wireless side underlying protocol stack receives the upstream data bag from website, and the upstream data bag is sent to wired bottom layer protocol stack; Wired bottom layer protocol stack is sealed upstream data and is dressed up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet is sent to AC; Wired bottom layer protocol stack passes through the CAPWAP data tunnel reception of configuration from the descending CAPWAP packet of AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to the wireless side underlying protocol stack; The wireless side underlying protocol stack sends to website with the downlink data packet that receives.
A kind of wireless access point control and agreement CAPWAP is provided the implement device of data tunnel comprises: receiver module is used for receiving the configuration parameter from access controller AC; Wireless side underlying protocol stack module is used for the configuration parameter configuration CAPWAP data tunnel that receives according to receiver module; Reception is from the upstream data bag of website, and the upstream data bag is sent to wired bottom layer protocol stack module; The downlink data packet of in the future own line end underlying protocol stack module sends to website; Wired bottom layer protocol stack module is used for the configuration parameter configuration CAPWAP data tunnel that receives according to receiver module; To seal from the upstream data of wireless side underlying protocol stack module and dress up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet be sent to AC; CAPWAP data tunnel by configuration receives the descending CAPWAP packet from AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to wireless side underlying protocol stack module.
The embodiment of the invention disposes the CAPWAP data tunnel by wireless side underlying protocol stack and the wired bottom layer protocol stack by WTP according to the configuration parameter from AC, and, the wireless side underlying protocol stack receives the upstream data bag from website, and the upstream data bag is sent to wired bottom layer protocol stack; Wired bottom layer protocol stack is sealed upstream data and is dressed up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet is sent to AC; Wired bottom layer protocol stack passes through the CAPWAP data tunnel reception of configuration from the descending CAPWAP packet of AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to the wireless side underlying protocol stack; The wireless side underlying protocol stack sends to website with the downlink data packet that receives, can realize realizing the CAPWAP data tunnel by underlying protocol stack, realize the CAPWAP data tunnel by application layer compared to existing technology, can shorten the data transmitting time, improve data transmission efficiency.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.
Description of drawings
Fig. 1 is the structured flowchart of the WLAN (wireless local area network) that thin WTP and AC constitute in the prior art;
The workflow diagram of the implementation method of the CAPWAP data tunnel that Fig. 2 provides for the embodiment of the invention;
The structured flowchart of the implement device of the CAPWAP data tunnel that Fig. 3 provides for the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are described, should be appreciated that embodiment described herein only is used for description and interpretation the present invention, and be not used in restriction the present invention.
At realizing that by application layer the CAPWAP data tunnel causes the problem that the data transmitting time is long, transmitting efficiency is low in the prior art, the embodiment of the invention has proposed a kind of implementation from underlying protocol stack realization CAPWAP data tunnel, in order to address this problem.
Fig. 2 shows the workflow diagram of the implementation method of the CAPWAP data tunnel that the embodiment of the invention provides, and this method comprises:
Step 201, WTP receive from the configuration parameter that inserts AC;
The wireless side underlying protocol stack of step 202, WTP and wired bottom layer protocol stack are according to configuration parameter configuration CAPWAP data tunnel;
Particularly, under the situation of WTP based on linux system, the CAPWAP application layer is written to the configuration parameter that receives in the proc file system; Wireless side underlying protocol stack and wired bottom layer protocol stack read configuration parameter from the proc file system, according to the configuration parameter configuration CAPWAP data tunnel that reads; This implementation is simple and easy to do, configuration operation efficient height;
And, the parameter that comprises CAPWAP data tunnel pattern in configuration parameter is split_mode or local_mode, like this, just can the CAPWAP data tunnel be arranged to split_mode pattern or local_mode pattern by the configuration parameter that AC issues, freely selecting or switching of CAPWAP data tunnel can be realized, the network architecture compatibility of WTP can be improved;
Perhaps, the CAPWAP application layer sends configuration parameter to wireless side underlying protocol stack and wired bottom layer protocol stack by I/O interface or bus interface, and wireless side underlying protocol stack and wired bottom layer protocol stack are according to the configuration parameter configuration CAPWAP data tunnel that receives; This implementation need dispose comparatively complicated I/O interface or bus interface;
Step 203, wireless side underlying protocol stack receive the upstream data bag from website;
Step 204, wireless side underlying protocol stack send to wired bottom layer protocol stack with the upstream data bag;
Preferably, before the wireless side underlying protocol stack sends to the upstream data bag in wired bottom layer protocol stack, also the upstream data bag is carried out the channelling mode matching treatment, specifically comprises:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, and the wireless side underlying protocol stack carries out split_mac to the upstream data bag to be handled; Split_mac is treated to prior art, repeats no more here;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, the wireless side underlying protocol stack carries out split_mac to the administrative class packet in the upstream data bag to be handled, and the data class packet in the upstream data is carried out type conversion;
After the wireless side underlying protocol stack executes the channelling mode matching treatment to the upstream data bag, the upstream data bag can be sent to the bridge of WTP inside, by bridge the upstream data bag be sent to wired bottom layer protocol stack;
Handle by the upstream data bag being carried out split_mac, mode with the two layer tunnel encapsulation is transmitted packet by the bridge environment, the normal transmission of packet can be guaranteed, time loss, the raising treatment effeciency of upper-layer protocol stack resolution data bag can be saved compared to existing technology;
Step 205, wired bottom layer protocol stack are sealed upstream data and are dressed up up CAPWAP packet;
Preferably, wired bottom layer protocol stack upstream data is sealed dress up up CAPWAP packet before, also the upstream data bag pattern matching of writing to is handled, specifically comprise:
Wired bottom layer protocol stack is being tunnel_mode﹠amp according to the virtual access point in the described configuration parameter (VAP, Virtual Access Point) tunnel configuration parameter with the VAP tunnel configuration between wired bottom layer protocol stack and the wireless side underlying protocol stack; Under the sta_ssid_on situation, and, if the CAPWAP data tunnel mode parameter in the configuration parameter is split_mode, go split_mac to handle to the upstream data bag, if the CAPWAP data tunnel mode parameter in the configuration parameter is local_mode, go split_mac to handle to the administrative class packet of upstream data bag;
Wired bottom layer protocol stack is sealed the operation of dressing up up CAPWAP packet with upstream data and is comprised that the first kind is handled or second class is handled:
The first kind is handled: if the length of upstream data bag is less than or equal to the difference of MTU MTU and predetermined CAPWAP packet head length, and the length of this upstream data bag then is encapsulated as this upstream data bag a up CAPWAP packet more than or equal to predetermined minimum data packet length; If the length of upstream data bag is less than or equal to the difference of MTU and predetermined CAPWAP packet head length, and this length of data package is less than predetermined minimum data packet length, this upstream data bag is filled into length of data package more than or equal to predetermined minimum data packet length and is less than or equal in the upstream data bag of MTU MTU and the difference of predetermined CAPWAP packet head length, and the upstream data bag after will filling is encapsulated as a up CAPWAP packet; Wherein, Yu Ding CAPWAP packet head comprises CAPWAP tunnel information, Internet protocol (IP, Internet Protocol) information and medium access control (MAC, Media Access Control) information;
Also be, the first kind judges whether the length≤MTU-CAPWAP tunnel information length-IP message length-MAC message length of upstream data bag is set up in handling, under situation about setting up, continue to judge whether the length 〉=minimum data packet length of upstream data bag is set up, under the two situation about all setting up, data envelope is dressed up up CAPWAP packet;
Second class is handled: if the length of upstream data bag is greater than the difference of MTU with the CAPWAP packet head length of being scheduled to, determine the cutting side-play amount, with the head of upstream data bag to the part of cutting side-play amount as cutting apart the first upstream data bag that obtains, the remainder of upstream data bag as cutting apart the second upstream data bag that obtains, is encapsulated as two up CAPWAP packets with these two upstream data bags respectively; Wherein, the cutting side-play amount is the IP message length and difference value and MTU of upstream data packet length, CAPWAP tunnel message length and CAPWAP packet head; Wherein, if the IP information of upstream data packet header is IPv4 information, the IP message length of CAPWAP packet head is the length of the IPv4 information of upstream data packet header, if the IP information of upstream data packet header is IPv6 information, the IP message length of CAPWAP packet head is the length of the IPv6 information of upstream data packet header;
Judge under the length≤MTU-CAPWAP tunnel information length-IP message length-invalid situation of MAC message length of upstream data bag during also namely second class is handled, determine the IP message length-MTU of cutting side-play amount=upstream data packet length+CAPWAP tunnel message length+CAPWAP packet head, according to the cutting side-play amount upstream data bag is cut into two packets;
In above-mentioned first kind processing and the processing of second class, the data packet length is calibrated, make the requirement of length of data package protocol compliant, compared to existing technology in by upper-layer protocol to data packet length calibration, can shorten processing data packets time, improve treatment effeciency; And above-mentioned processing procedure provides the processing method at IPv4 packet and IPv6 packet, can improve the network-adaptive ability of WTP;
On the basis that the above-mentioned first kind is handled and second class is handled, upstream data is sealed the operation of dressing up up CAPWAP packet comprises:
Handle at the first kind, wired bottom layer protocol stack is filled into the part of CAPWAP packet head correspondence with the MAC information of CAPWAP tunnel information, IP information and upstream data bag, the upstream data bag is filled into the net load part of CAPWAP packet; Wherein, if the IP information in the upstream data bag is IPv4 information, the IP information that then is filled into the head of CAPWAP packet is the IPv4 information (comprising source IP address information and purpose IP address information) in the upstream data bag, if the IP information in the upstream data bag is IPv6 information, the IP information that then is filled into CAPWAP packet head comprises that the IP address of WTP is that the IP address of source IP address, AC is purpose IP address;
Handle at second class, for the first upstream data bag, wired bottom layer protocol stack is filled into the MAC information of CAPWAP tunnel information, IP information and upstream data bag the part of the head correspondence of CAPWAP packet, the first upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 1; For the second upstream data bag, wired bottom layer protocol stack is filled into the MAC information of IP information and upstream data bag on the head of CAPWAP packet, the second upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 2; Wherein, if the IP information of the first upstream data packet header is IPv4 information, the IP information of CAPWAP packet head is the IPv4 information of the first upstream data packet header, if the IP information of the first upstream data packet header is IPv6 information, the IP information of CAPWAP packet head is the IPv6 information of upstream data packet header;
In above-mentioned data envelope process of assembling, adopt the method for disposable encapsulation, compared to existing technology in the processing method of calling at many levels by the upper-layer protocol stack, can improve the efficient of CAPWAP packet encapsulation;
Step 206, wired bottom layer protocol stack send to AC by the CAPWAP data tunnel of configuration with up CAPWAP packet;
Step 207, wired bottom layer protocol stack pass through the CAPWAP data tunnel reception of configuration from the descending CAPWAP packet of AC;
Preferably, wired bottom layer protocol stack also carries out integrality to descending CAPWAP packet to be handled, and integrality is handled and comprised:
The header information of the descending CAPWAP packet that parsing receives obtains the integrity flag position, in the packet of storage, search the packet that whether has identical integrity flag position, if do not find the packet with identical integrity flag position, the descending CAPWAP packet that storage receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 1, after the packet with identical integrity flag position that finds removed CAPWAP packet head, merge to the afterbody of the descending CAPWAP packet that receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 2, after the descending CAPWAP packet that receives removed CAPWAP packet head, merge to the afterbody of the packet with identical integrity flag position that finds;
In the said process, by the descending CAPWAP packet that receives being carried out flag bit inquiry and searching packet with identical flag bit and descending CAPWAP packet is stored, can reform to the packet of out of order arrival, can improve the receiving efficiency of descending CAPWAP packet and to the adaptability of complex network environment;
Step 208, wired bottom layer protocol stack are dressed up downlink data packet with descending CAPWAP packet deblocking;
Particularly, the part behind the CAPWAP packet head that removal in the descending CAPWAP packet is scheduled to is as downlink data packet;
The process of above-mentioned decapsulation adopts the method for a cutting that descending CAPWAP packet is carried out decapsulation, and carries out decapsulation by the upper-layer protocol stack in the prior art, can improve treatment effeciency;
Step 209, wired bottom layer protocol stack send to the wireless side underlying protocol stack with downlink data packet;
Preferably, wired bottom layer protocol stack sends to downlink data packet before the wireless side underlying protocol stack, also downlink data is carried out the channelling mode matching treatment:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, and wired bottom layer protocol stack carries out split_mac to downlink data packet to be handled;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, and wired bottom layer protocol stack carries out split_mac to the administrative class packet in the downlink data packet to be handled;
After wired bottom layer protocol stack executes the channelling mode matching treatment to downlink data packet, downlink data packet can be sent to the bridge of WTP inside, by bridge downlink data packet be sent to the wireless side underlying protocol stack;
Step 210, wireless side underlying protocol stack send to website with the downlink data packet that receives.
The wireless side underlying protocol stack sends to the downlink data packet that receives before the website, also the downlink data packet pattern matching of writing to is handled:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, and the wireless side underlying protocol stack goes split_mac to handle to downlink data packet;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, and the wireless side underlying protocol stack goes split_mac to handle to the management packets in the downlink data packet.
By above-mentioned processing procedure, wireless side underlying protocol stack and wired bottom layer protocol stack by WTP dispose the CAPWAP data tunnel according to the configuration parameter from AC, and, the wireless side underlying protocol stack receives the upstream data bag from website, and the upstream data bag is sent to wired bottom layer protocol stack; Wired bottom layer protocol stack is sealed upstream data and is dressed up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet is sent to AC; Wired bottom layer protocol stack passes through the CAPWAP data tunnel reception of configuration from the descending CAPWAP packet of AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to the wireless side underlying protocol stack; The wireless side underlying protocol stack sends to website with the downlink data packet that receives, can realize realizing the CAPWAP data tunnel by underlying protocol stack, realize the CAPWAP data tunnel by application layer compared to existing technology, can shorten the data transmitting time, improve data transmission efficiency.
Based on identical inventive concept, the embodiment of the invention also provides a kind of implement device of CAPWAP data tunnel, and as shown in Figure 3, this device comprises:
Receiver module 31 is used for receiving the configuration parameter from access controller AC;
Wireless side underlying protocol stack module 32 is connected to receiver module 31, is used for the configuration parameter configuration CAPWAP data tunnel that receives according to receiver module 31; Reception is from the upstream data bag of website, and the upstream data bag is sent to wired bottom layer protocol stack module 33; The downlink data packet of in the future own line end underlying protocol stack module 33 sends to website;
Particularly, wireless side underlying protocol stack module 32 specifically is used for: read configuration parameter from the proc file system, according to the configuration parameter configuration CAPWAP data tunnel that reads;
Wireless side underlying protocol stack module 32 also is used for: be under the situation of split_mode at the CAPWAP of configuration parameter data tunnel mode parameter, the upstream data bag carried out split_mac handle; CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, the administrative class packet in the upstream data bag is carried out split_mac handle, and the data class packet in the upstream data is carried out type conversion.
Wireless side underlying protocol stack module 32 also is used for: be under the situation of split_mode at the CAPWAP of configuration parameter data tunnel mode parameter, go split_mac to handle to downlink data packet; CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, goes split_mac to handle to the management packets in the downlink data packet.
Wired bottom layer protocol stack module 33 is connected to receiver module 31 and wireless side underlying protocol stack module 32, is used for the configuration parameter configuration CAPWAP data tunnel that receives according to receiver module 31; To seal from the upstream data of wireless side underlying protocol stack module 32 and dress up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet be sent to AC; CAPWAP data tunnel by configuration receives the descending CAPWAP packet from AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to wireless side underlying protocol stack module 32.
Particularly, wired bottom layer protocol stack module 33 reads configuration parameter from the proc file system, according to the configuration parameter configuration CAPWAP data tunnel that reads.
Wired bottom layer protocol stack module 33 also is used for: be tunnel_mode﹠amp in the VAP tunnel configuration parameter according to configuration parameter with the VAP tunnel configuration; Under the sta_ssid_on situation, and, if the CAPWAP data tunnel mode parameter in the configuration parameter is split_mode, go split_mac to handle to the upstream data bag, if the CAPWAP data tunnel mode parameter in the configuration parameter is local_mode, go split_mac to handle to the administrative class packet of upstream data bag;
Wired bottom layer protocol stack module 33 specifically is used for: the upstream data bag is carried out first kind processing or the processing of second class;
The first kind is handled and to be comprised: if the length of upstream data bag is less than or equal to the difference of MTU MTU and predetermined CAPWAP packet head length, and the length of this upstream data bag then is encapsulated as this upstream data bag a up CAPWAP packet more than or equal to predetermined minimum data packet length; If the length of upstream data bag is less than or equal to the difference of MTU and CAPWAP packet head length, and the length of this upstream data bag is less than predetermined minimum data packet length, this upstream data bag is filled into length of data package more than or equal to predetermined minimum data packet length and is less than or equal to the difference of MTU MTU and predetermined CAPWAP packet head length, and the packet encapsulation after will filling is a up CAPWAP packet; Wherein, Yu Ding CAPWAP packet head comprises CAPWAP tunnel information, IP information and MAC information;
Second class is handled and is comprised: if the length of upstream data bag is greater than the difference of MTU with the CAPWAP packet head length of being scheduled to, determine the cutting side-play amount, with the head of upstream data bag to the part of cutting side-play amount as cutting apart the first upstream data bag that obtains, as cutting apart the second upstream data bag that obtains, be two up CAPWAP packets with these two packet encapsulation with the remainder of upstream data bag respectively; Wherein, the cutting side-play amount is the IP message length and difference value and MTU of upstream data packet length, CAPWAP tunnel message length and CAPWAP packet head; Wherein, if the IP information of upstream data packet header is IPv4 information, the IP message length of CAPWAP packet head is the length of the IPv4 information of upstream data packet header, if the IP information of upstream data packet header is IPv6 information, the IP message length of CAPWAP packet head is the length of the IPv6 information of upstream data packet header
Wired bottom layer protocol stack module 33 is handled at the first kind, and the MAC information of CAPWAP tunnel information, IP information and upstream data bag is filled into the part of CAPWAP packet head correspondence, the upstream data bag is filled into the net load part of CAPWAP packet; Wherein, if the IP information in the upstream data bag is IPv4 information, the IP information that then is filled into the head of CAPWAP packet is the IPv4 information in the upstream data bag, if the IP information in the upstream data bag is IPv6 information, the IP information that then is filled into CAPWAP packet head comprises that the IP address of WTP is that the IP address of source IP address, AC is purpose IP address;
Wired bottom layer protocol stack module 33 is handled at second class, for the first upstream data bag, the MAC information of CAPWAP tunnel information, IP information and upstream data bag is filled into the part of the head correspondence of CAPWAP packet, the first upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 1; For the second upstream data bag, wired bottom layer protocol stack is filled into the MAC information of IP information and upstream data bag on the head of CAPWAP packet, the second upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 2; Wherein, if the IP information of the first upstream data packet header is IPv4 information, the IP information of CAPWAP packet head is the IPv4 information of upstream data packet header, if the IP information of the first upstream data packet header is IPv6 information, the IP information of CAPWAP packet head is the IPv6 information of upstream data packet header.
Layer protocol stack module 33 pairs of descending CAPWAP packets that receive in wired bottom carry out completeness check, the descending CAPWAP packet by completeness check is not carried out integrality handle; Integrality is handled and comprised: the header information of resolving the descending CAPWAP packet that receives obtains the integrity flag position, in the packet of storage, search the packet that whether has identical integrity flag position, if do not find the packet with identical integrity flag position, the descending CAPWAP packet that storage receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 1, after the packet with identical integrity flag position that finds removed CAPWAP packet head, merge to the afterbody of the descending CAPWAP packet that receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 2, after the descending CAPWAP packet that receives removed CAPWAP packet head, merge to the afterbody of the packet with identical integrity flag position that finds.
Wired bottom layer protocol stack module 33 specifically is used for: the part behind the CAPWAP packet head that descending CAPWAP packet removal is predetermined is as downlink data packet.
Wired bottom layer protocol stack module 33 also is used for: be under the situation of split_mode downlink data packet to be carried out split_mac to handle at the CAPWAP of configuration parameter data tunnel mode parameter; CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, the administrative class packet in the downlink data packet is carried out split_mac handle.
By device as shown in Figure 3, can realize the CAPWAP data tunnel by underlying protocol stack, realize the CAPWAP data tunnel by application layer in compared to existing technology, can shorten the data transmitting time, improve data transmission efficiency.
One of ordinary skill in the art will appreciate that and realize that all or part of step that above-described embodiment method is carried is to instruct relevant hardware to finish by program, described program can be stored in a kind of computer-readable recording medium, this program comprises one of step or its combination of method embodiment when carrying out.
In addition, each functional unit in each embodiment of the present invention can be integrated in the processing module, also can be that the independent physics in each unit exists, and also can be integrated in the module two or more unit.Above-mentioned integrated module both can adopt the form of hardware to realize, also can adopt the form of software function module to realize.If described integrated module realizes with the form of software function module and during as independently production marketing or use, also can be stored in the computer read/write memory medium.
Those skilled in the art should understand that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt complete hardware embodiment, complete software embodiment or in conjunction with the form of the embodiment of software and hardware aspect.And the present invention can adopt the form of the computer program of implementing in one or more computer-usable storage medium (including but not limited to magnetic disc store and optical memory etc.) that wherein include computer usable program code.
The present invention is that reference is described according to flow chart and/or the block diagram of method, equipment (system) and the computer program of the embodiment of the invention.Should understand can be by the flow process in each flow process in computer program instructions realization flow figure and/or the block diagram and/or square frame and flow chart and/or the block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, make the instruction of carrying out by the processor of computer or other programmable data processing device produce to be used for the device of the function that is implemented in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, make the instruction that is stored in this computer-readable memory produce the manufacture that comprises command device, this command device is implemented in the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded on computer or other programmable data processing device, make and carry out the sequence of operations step producing computer implemented processing at computer or other programmable devices, thereby be provided for being implemented in the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame in the instruction that computer or other programmable devices are carried out.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (20)

1. a wireless access point control and agreement CAPWAP is provided the implementation method of data tunnel is characterized in that, comprising:
WAP (wireless access point) WTP receives the configuration parameter from access controller AC, and the wireless side underlying protocol stack of WTP and wired bottom layer protocol stack are according to configuration parameter configuration CAPWAP data tunnel;
The wireless side underlying protocol stack receives the upstream data bag from website, and the upstream data bag is sent to wired bottom layer protocol stack; Wired bottom layer protocol stack is sealed upstream data and is dressed up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet is sent to AC;
Wired bottom layer protocol stack passes through the CAPWAP data tunnel reception of configuration from the descending CAPWAP packet of AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to the wireless side underlying protocol stack; The wireless side underlying protocol stack sends to website with the downlink data packet that receives.
2. according to the method for claim 1, it is characterized in that, according to configuration parameter configuration CAPWAP data tunnel, specifically comprise:
Under the situation of WTP based on linux system, the CAPWAP application layer is written to the configuration parameter that receives in the proc file system;
Wireless side underlying protocol stack and wired bottom layer protocol stack read configuration parameter from the proc file system, according to the configuration parameter configuration CAPWAP data tunnel that reads.
3. method according to claim 1 is characterized in that, the wireless side underlying protocol stack sends to the upstream data bag before the layer protocol stack of wired bottom, and described method comprises:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, and the wireless side underlying protocol stack carries out split_mac to the upstream data bag to be handled;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, the wireless side underlying protocol stack carries out split_mac to the administrative class packet in the upstream data bag to be handled, and the data class packet in the upstream data is carried out type conversion.
4. method according to claim 3 is characterized in that, wired bottom layer protocol stack is sealed upstream data and dressed up before the up CAPWAP packet, and described method also comprises:
Wired bottom layer protocol stack is being tunnel_mode﹠amp according to the virtual access point VAP tunnel configuration parameter in the configuration parameter with the VAP tunnel configuration between wired bottom layer protocol stack and the wireless side underlying protocol stack; Under the sta_ssid_on situation, and, if the CAPWAP data tunnel mode parameter in the configuration parameter is split_mode, go split_mac to handle to the upstream data bag, if the CAPWAP data tunnel mode parameter in the configuration parameter is local_mode, go split_mac to handle to the administrative class packet of upstream data bag.
5. method according to claim 1 is characterized in that, wired bottom layer protocol stack is sealed upstream data and dressed up up CAPWAP packet, specifically comprises:
The first kind is handled: if the length of upstream data bag is less than or equal to the difference of MTU MTU and predetermined CAPWAP packet head length, and the length of this upstream data bag then is encapsulated as this upstream data bag a up CAPWAP packet more than or equal to predetermined minimum data packet length; If the length of upstream data bag is less than or equal to the difference of MTU and predetermined CAPWAP packet head length, and this length of data package is less than predetermined minimum data packet length, this upstream data bag is filled into length of data package more than or equal to predetermined minimum data packet length and is less than or equal in the upstream data bag of MTU MTU and the difference of predetermined CAPWAP packet head length, and the upstream data bag after will filling is encapsulated as a up CAPWAP packet; Wherein, Yu Ding CAPWAP packet head comprises CAPWAP tunnel information, Internet protocol IP information and media access control MAC information; Perhaps,
Second class is handled: if the length of upstream data bag is greater than the difference of MTU with the CAPWAP packet head length of being scheduled to, determine the cutting side-play amount, with the head of upstream data bag to the part of cutting side-play amount as cutting apart the first upstream data bag that obtains, the remainder of upstream data bag as cutting apart the second upstream data bag that obtains, is encapsulated as two up CAPWAP packets with these two upstream data bags respectively; Wherein, the cutting side-play amount is the IP message length and difference value and MTU of upstream data packet length, CAPWAP tunnel message length and CAPWAP packet head; Wherein, if the IP information of upstream data packet header is IPv4 information, the IP message length of CAPWAP packet head is the length of the IPv4 information of upstream data packet header, if the IP information of upstream data packet header is IPv6 information, the IP message length of CAPWAP packet head is the length of the IPv6 information of upstream data packet header.
6. method according to claim 5 is characterized in that, the upstream data bag is encapsulated as up CAPWAP packet, specifically comprises:
Handle at the first kind, wired bottom layer protocol stack is filled into the part of CAPWAP packet head correspondence with the MAC information of CAPWAP tunnel information, IP information and upstream data bag, the upstream data bag is filled into the net load part of CAPWAP packet; Wherein, if the IP information in the upstream data bag is IPv4 information, the IP information that then is filled into the head of CAPWAP packet is the IPv4 information in the upstream data bag, if the IP information in the upstream data bag is IPv6 information, the IP information that then is filled into CAPWAP packet head comprises that the IP address of WTP is that the IP address of source IP address, AC is purpose IP address; Perhaps
Handle at second class, for the first upstream data bag, wired bottom layer protocol stack is filled into the MAC information of CAPWAP tunnel information, IP information and upstream data bag the part of the head correspondence of CAPWAP packet, the first upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 1; For the second upstream data bag, wired bottom layer protocol stack is filled into the MAC information of IP information and upstream data bag on the head of CAPWAP packet, the second upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 2; Wherein, if the IP information of the first upstream data packet header is IPv4 information, the IP information of CAPWAP packet head is the IPv4 information of the first upstream data packet header, if the IP information of the first upstream data packet header is IPv6 information, the IP information of CAPWAP packet head is the IPv6 information of upstream data packet header.
7. method according to claim 1 is characterized in that, after the descending CAPWAP packet of layer protocol stack reception in wired bottom from AC, described method also comprises:
The descending CAPWAP packet that receives is carried out completeness check, the descending CAPWAP packet by completeness check is not carried out integrality handle;
Integrality is handled and comprised: the header information of resolving the descending CAPWAP packet that receives obtains the integrity flag position, in the packet of storage, search the packet that whether has identical integrity flag position, if do not find the packet with identical integrity flag position, the descending CAPWAP packet that storage receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 1, after the packet with identical integrity flag position that finds removed CAPWAP packet head, merge to the afterbody of the descending CAPWAP packet that receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 2, after the descending CAPWAP packet that receives removed CAPWAP packet head, merge to the afterbody of the packet with identical integrity flag position that finds.
8. method according to claim 1 is characterized in that, wired bottom layer protocol stack is dressed up downlink data packet with descending CAPWAP packet deblocking, specifically comprises:
Part behind the CAPWAP packet head that removal in the descending CAPWAP packet is predetermined is as downlink data packet.
9. method according to claim 1 is characterized in that, wired bottom layer protocol stack sends to downlink data packet before the wireless side underlying protocol stack, and described method also comprises:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, and wired bottom layer protocol stack carries out split_mac to downlink data packet to be handled;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, and wired bottom layer protocol stack carries out split_mac to the administrative class packet in the downlink data packet to be handled.
10. method according to claim 9 is characterized in that, the wireless side underlying protocol stack sends to the downlink data packet that receives before the website, and described method also comprises:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, and the wireless side underlying protocol stack goes split_mac to handle to downlink data packet;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, and the wireless side underlying protocol stack goes split_mac to handle to the management packets in the downlink data packet.
11. a wireless access point control and agreement CAPWAP is provided the implement device of data tunnel is characterized in that, comprising:
Receiver module is used for receiving the configuration parameter from access controller AC;
Wireless side underlying protocol stack module is used for the configuration parameter configuration CAPWAP data tunnel that receives according to receiver module; Reception is from the upstream data bag of website, and the upstream data bag is sent to wired bottom layer protocol stack module; The downlink data packet of in the future own line end underlying protocol stack module sends to website;
Wired bottom layer protocol stack module is used for the configuration parameter configuration CAPWAP data tunnel that receives according to receiver module; To seal from the upstream data of wireless side underlying protocol stack module and dress up up CAPWAP packet, and by the CAPWAP data tunnel of configuration up CAPWAP packet be sent to AC; CAPWAP data tunnel by configuration receives the descending CAPWAP packet from AC, descending CAPWAP packet deblocking is dressed up downlink data packet, and downlink data packet is sent to wireless side underlying protocol stack module.
12. device according to claim 11 is characterized in that, wireless side underlying protocol stack module specifically is used for: read configuration parameter from the proc file system, according to the configuration parameter configuration CAPWAP data tunnel that reads;
Wired bottom layer protocol stack module specifically is used for: read configuration parameter from the proc file system, according to the configuration parameter configuration CAPWAP data tunnel that reads.
13. device according to claim 11 is characterized in that, wireless side underlying protocol stack module also is used for:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, the upstream data bag is carried out split_mac handle;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, the administrative class packet in the upstream data bag is carried out split_mac handle, and the data class packet in the upstream data is carried out type conversion.
14. device according to claim 13 is characterized in that, wired bottom layer protocol stack module also is used for:
Be tunnel_mode﹠amp according to the virtual access point VAP tunnel configuration parameter in the configuration parameter with the VAP tunnel configuration; Under the sta_ssid_on situation, and, if the CAPWAP data tunnel mode parameter in the configuration parameter is split_mode, go split_mac to handle to the upstream data bag, if the CAPWAP data tunnel mode parameter in the configuration parameter is local_mode, go split_mac to handle to the administrative class packet of upstream data bag.
15. device according to claim 11 is characterized in that, wired bottom layer protocol stack module specifically is used for: the upstream data bag is carried out first kind processing or the processing of second class;
The first kind is handled and to be comprised: if the length of upstream data bag is less than or equal to the difference of MTU MTU and predetermined CAPWAP packet head length, and the length of this upstream data bag then is encapsulated as this upstream data bag a up CAPWAP packet more than or equal to predetermined minimum data packet length; If the length of upstream data bag is less than or equal to the difference of MTU and CAPWAP packet head length, and the length of this upstream data bag is less than predetermined minimum data packet length, this upstream data bag is filled into length of data package more than or equal to predetermined minimum data packet length and is less than or equal in the upstream data bag of MTU MTU and the difference of predetermined CAPWAP packet head length, and the upstream data bag after will filling is encapsulated as a up CAPWAP packet; Wherein, Yu Ding CAPWAP packet head comprises CAPWAP tunnel information, IP information and MAC information; Perhaps,
Second class is handled and is comprised: if the length of upstream data bag is greater than the difference of MTU with the CAPWAP packet head length of being scheduled to, determine the cutting side-play amount, with the head of upstream data bag to the part of cutting side-play amount as cutting apart the first upstream data bag that obtains, the remainder of upstream data bag as cutting apart the second upstream data bag that obtains, is encapsulated as two up CAPWAP packets with these two upstream data bags respectively; Wherein, the cutting side-play amount is the IP message length and difference value and MTU of upstream data packet length, CAPWAP tunnel message length and CAPWAP packet head; Wherein, if the IP information of upstream data packet header is IPv4 information, the IP message length of CAPWAP packet head is the length of the IPv4 information of upstream data packet header, if the IP information of upstream data packet header is IPv6 information, the IP message length of CAPWAP packet head is the length of the IPv6 information of upstream data packet header.
16. device according to claim 15 is characterized in that, wired bottom layer protocol stack module specifically is used for:
Handle at the first kind, the MAC information of CAPWAP tunnel information, IP information and upstream data bag is filled into the part of CAPWAP packet head correspondence, the upstream data bag is filled into the net load part of CAPWAP packet; Wherein, if the IP information in the upstream data bag is IPv4 information, the IP information that then is filled into the head of CAPWAP packet is the IPv4 information in the upstream data bag, if the IP information in the upstream data bag is IPv6 information, the IP information that then is filled into CAPWAP packet head comprises that the IP address of WTP is that the IP address of source IP address, AC is purpose IP address; Perhaps,
Handle at second class, for the first upstream data bag, the MAC information of CAPWAP tunnel information, IP information and upstream data bag is filled into the part of the head correspondence of CAPWAP packet, the first upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 1; For the second upstream data bag, wired bottom layer protocol stack is filled into the MAC information of IP information and upstream data bag on the head of CAPWAP packet, the second upstream data bag is filled into the net load part of CAPWAP packet, and in the predetermined field of IP message part, fills in the sequence number sign of expression sequence number 2; Wherein, if the IP information of the first upstream data packet header is IPv4 information, the IP information of CAPWAP packet head is the IPv4 information of upstream data packet header, if the IP information of the first upstream data packet header is IPv6 information, the IP information of CAPWAP packet head is the IPv6 information of upstream data packet header.
17. device according to claim 11 is characterized in that, wired bottom layer protocol stack also is used for:
The descending CAPWAP packet that receives is carried out completeness check, the descending CAPWAP packet by completeness check is not carried out integrality handle;
Integrality is handled and comprised: the header information of resolving the descending CAPWAP packet that receives obtains the integrity flag position, in the packet of storage, search the packet that whether has identical integrity flag position, if do not find the packet with identical integrity flag position, the descending CAPWAP packet that storage receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 1, after the packet with identical integrity flag position that finds removed CAPWAP packet head, merge to the afterbody of the descending CAPWAP packet that receives;
If find the packet with identical integrity flag position, and the sequence number that comprises in the descending CAPWAP packet head that receives sign is 2, after the descending CAPWAP packet that receives removed CAPWAP packet head, merge to the afterbody of the packet with identical integrity flag position that finds.
18. device according to claim 11 is characterized in that, wired bottom layer protocol stack module specifically is used for:
Part behind the CAPWAP packet head that removal in the descending CAPWAP packet is predetermined is as downlink data packet.
19. device according to claim 11 is characterized in that, wired bottom layer protocol stack module also is used for:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode downlink data packet to be carried out split_mac to handle;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, the administrative class packet in the downlink data packet is carried out split_mac handle.
20. device according to claim 19 is characterized in that, wireless side underlying protocol stack module also is used for:
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of split_mode, goes split_mac to handle to downlink data packet;
CAPWAP data tunnel mode parameter in configuration parameter is under the situation of local_mode, goes split_mac to handle to the management packets in the downlink data packet.
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