CN101710864A - Collocation method and device for multi-gateway Linux server - Google Patents
Collocation method and device for multi-gateway Linux server Download PDFInfo
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- CN101710864A CN101710864A CN200910238238A CN200910238238A CN101710864A CN 101710864 A CN101710864 A CN 101710864A CN 200910238238 A CN200910238238 A CN 200910238238A CN 200910238238 A CN200910238238 A CN 200910238238A CN 101710864 A CN101710864 A CN 101710864A
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Abstract
The invention provides a collocation method for a multi-gateway Linux server, comprising the steps of acquiring collocation information of each gateway of Linux server, classifying the gateway according to the collocation information, re-collocating address and route of each gateway, setting a tactic route regulation, establishing a specific route table according to the tactic route regulation and the gateway collocation, updating route buffer memory in order to lead the specific route table to come into force immediately. The invention further provides a collocation device for a multi-gateway Linux server. The invention can promote the utility ratio of gateway while can ensure the flexibility of system.
Description
Technical field
The present invention relates to the port arrangement technology of network communication, be meant a kind of collocation method and device of multi-gateway Linux server especially.
Background technology
In linux system, generally need three steps with PERCOM peripheral communication:
Step 1: transmit leg generates the IP packet according to TCP (TCP/IP), and described packet is made up of IP source address, IP destination address, IP data etc.;
Step 2: transmit leg is inquired about available route entry in the route-caching (route cache) of linux system, if find the route entry of accurate coupling, then sends the IP packet that generates according to route entry; If do not find the route entry of coupling, then in routing table (route table), search route entry according to longest prefix match (LPM) algorithm;
Wherein, the route entry of described coupling is: the network prefix of the IP destination address institute map network of packet conforms to the purpose network prefix in the route entry;
Step 3: transmit leg sends the IP packet according to the specified network interface of route entry that mates among route cache or the route table.
In the linux system that has only a network interface, route entry is simple, and all packets are all from a network interface turnover.And for the linux system that has a plurality of network interfaces, situation will more complicated: suppose that each network interface all disposes an IP address, the different corresponding same networks of network interface possibility, the IP source address of packet, only corresponding with one of them network interface, when linux system need send packet, linux system is according to the IP destination address of packet, in routing table, select first route entry that conforms to the IP destination address, the IP address of the network interface of this route entry correspondence may be inconsistent with the IP source address of packet.When using other network interfaces to send out packet, also same problem can appear, and so, just may cause the bandwidth availability ratio of a network interface very high, and the bandwidth availability ratio of another port is almost nil, causes the unnecessary wasting of resources.
Based on the problems referred to above, a solution is proposed in the prior art:, SOCKET is tied on the appointment network interface by the mode of socket (SOCKET) attribute is set, like this, packet just can send from specifying network interface, and still, this method has following shortcoming:
The first, need the application modification code, increase the setting of binding SOCKET to network interface, cumbersome; If second SOCKET is tied to wrong network interface, can cause normal data communication to be interrupted; Three, SOCKET is tied to the network interface of appointment, can only receives packet on this network interface, other network interfaces can't be utilized, and use dumb.
In the prior art, also have solution to propose: the IP ROUTE2 by linux system finishes load balancing, packet is divided according to time or other rules, packet is sent from different network interfaces, though can utilize the bandwidth of different network interfaces, but behind the Rulemaking, the outlet of uncontrollable packet has reduced the flexibility of system.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of collocation method and device of multi-gateway Linux server, can improve the utilance of network interface when guaranteeing system flexibility.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of collocation method of multi-gateway Linux server, comprising:
Obtain the configuration information of each network interface of Linux server, network interface is classified according to configuration information;
Reconfigure the address and the route of each network interface;
The Provisioning Policy routing rule according to tactful routing rule and the specific routing table of network interface arrangement, and refreshes route-caching.
Wherein, described network interface the classification according to configuration information comprises: with the IP address of network interface and subnet mask be operating as keyword, the network interface that keyword is identical is divided into a class, and classification results is stored in the array, element in the array is the configuration information of network interface, and array is the index of network interface.
In the such scheme, described tactful routing rule is: linux system is according to the IP source address inquiry specific routing table corresponding with network interface of packet.Describedly comprise according to tactful routing rule and the specific routing table of network interface arrangement: specified circuit by network interface address, purpose IP address and subnet mask, and specify route be stored in the specific routing table of network interface correspondence therewith; The unique corresponding specific routing table of each network interface.
In the such scheme, described address and the route that reconfigures each network interface comprises: IP address and subnet mask that network interface is set by the ioctl_set_ifaddr interface, the default route of network interface is set by the ioctl_set_route interface, the network interface address of specify default route, gateway address, and purpose IP address and subnet mask are set to 0.
The present invention also provides a kind of inking device of multi-gateway Linux server, comprising:
Network interface configuration acquisition module is used for obtaining the configuration information of each network interface of Linux server, and sends to the network interface sort module;
The network interface sort module is used for the network interface configuration information according to the acquisition of network interface configuration acquisition module, and network interface is classified;
The network interface configuration module is used for reconfiguring the address and the route of each network interface according to sorted network interface configuration information;
Strategy routing rule generation module is used for the Provisioning Policy routing rule;
The routing table constructing module is used for according to tactful routing rule and the specific routing table of network interface arrangement;
The route-caching refresh module is used to refresh route-caching.
This shows, the collocation method of multi-gateway Linux server provided by the present invention and device, according to network interface address transmission data bag, so, not only do not need to revise the code of application program, realize simple and convenient, and, different packets is sent, therefore from different network interfaces, can better increase the utilance of network interface, improve the flexibility of bandwidth availability ratio and system.
Description of drawings
Fig. 1 is the realization flow schematic diagram of multi-gateway Linux server collocation method of the present invention;
Fig. 2 is the realization flow schematic diagram of network interface classification among the present invention;
Fig. 3 is the composition structural representation of multi-gateway Linux server inking device of the present invention.
Embodiment
Basic thought of the present invention is: reconfigure each network interface of Linux server, and the tactful routing rule of Linux server is set, according to the tactful routing rule and the specific routing table of network interface arrangement that are provided with, the corresponding specific routing table of each network interface, the Linux server is searched specific routing table according to the source IP address of packet, sends packet according to the route entry in the routing table.
Here, all load and carry out linux system in each Linux server.
Described tactful routing rule can be: linux system is the network interface address lookup specific routing table corresponding with network interface according to the IP source address of packet; Also can be: linux system be inquired about the specific routing table corresponding with network interface according to the IP destination address of packet, and in the practical application, is not limited to said method, sends from different network interfaces as long as can realize the different pieces of information bag.
Described specific routing table is the default routing table of linux system, by ip_add_route interface structure, is different from System Routing Table, specific routing table sequence number between 1 to 32765, the corresponding specific routing table of each network interface.
The present invention is described in more detail in conjunction with the accompanying drawings below by specific embodiment.
The collocation method of multi-gateway Linux server of the present invention may further comprise the steps as shown in Figure 1:
Here, described obtaining is the configuration information that obtains each network interface by the ioctl_get_allifaddrs interface; Wherein, described configuration information comprises the next hop address of IP address, subnet mask and the configuration of current network interface, i.e. gateway address etc.Described ioctl_get_allifaddrs interface is the encapsulation to the ioctl DLL (dynamic link library) of linux system, and major function is to obtain the data block that comprises each network interface configuration information in the server, and parses the network interface configuration information from data block.
Described network interface is categorized as: to the network interface configuration information that is obtained, with the IP address of network interface and subnet mask be operating as keyword (KEY), the network interface with same keyword is a class.
In the practical operation, can set an array NETSEG[SegCnt] [count], be used to store the network interface classified information; After the network interface classification, the corresponding same class network interface of each row of array, the configuration information of a network interface in the corresponding a certain class network interface of each element of each row, the element in the array is exactly the index of network interface.
Because may existing, the network interface of Linux server is not set up the situation that IP address or network interface damage, so need IP address, subnet mask and the route of the network interface that can normally use be reconfigured.
Generally, the IP address and the subnet mask of network interface are set by the ioctl_set_ifaddr interface, described IP address and subnet mask are provided with according to sorted network interface configuration information, and described ioctl_set_ifaddr interface is for carrying out the encapsulation that network interface IP address and subnet mask setting are carried out to the ioctl DLL (dynamic link library) of linux system and by this interface.
When calling the ioctl_set_ifaddr interface, linux system can add a direct-connected route to network interface automatically, so the configuration route mainly is that default route is set in this step.Because the default gateway of similar network interface configuration is identical, get final product so only need therein on the network interface default route to be set.By the ioctl_set_route interface default route is set, described ioctl_set_route interface is for carrying out the encapsulation that the route setting of network interface is carried out to the ioctl DLL (dynamic link library) of linux system and by this interface.
When the network interface default route is set, the network interface address of specify default route, gateway address, and purpose IP address and subnet mask are set to 0.The standard of selecting to be provided with the network interface of default route in the similar network interface is: similar network interface middle port connection status (LINK) is for opening (UP), and in the similar network interface at NETSEG[SegCnt] index minimum in [count] so that search route with the shortest time.
Specifically comprise: in linux system, by ip_add_rule interface Provisioning Policy routing rule, described tactful routing rule is: linux system is the network interface address lookup specific routing table corresponding with network interface according to the IP source address of packet; Also: linux system is according to the IP destination address inquiry specific routing table corresponding with network interface of packet; And, be not limited to above method in actual applications, send from different network interfaces as long as can realize the different pieces of information bag.
In the specific embodiment of the invention, inquiring about the specific routing table corresponding with network interface with linux system according to the IP source address of packet is example, described specific routing table is the default routing table of linux system, specific routing table sequence number is between 1 to 32765, the unique corresponding specific routing table of each network interface, be the uniqueness of the specific routing table that guarantees each network interface correspondence, the sequence number of specific routing table according to network interface at NETSEG[SegCnt] index in [count] increases progressively.Wherein, described ip_add_rule interface is that linux system is to carrying out the encapsulation that route is provided with by the rtnetlink DLL (dynamic link library).
Construct the route of specific routing table by the ip_add_route interface, the route of the specific routing table of described structure comprises: specified circuit by network interface address, purpose IP address and subnet mask, and specify route be stored in the specific routing table of network interface correspondence therewith.The method that route is set in the path establishing method of specific routing table and the prior art is consistent, the network interface route is set, all need to specify network interface address, purpose IP address and subnet mask, different is: do not need specified circuit by being placed in which routing table in the prior art, acquiescence is to be placed in the System Routing Table, and the present invention is when being provided with the network interface route, need specified circuit by being stored in the specific routing table corresponding with set network interface, described ip_add_route interface is that linux system is to carrying out the encapsulation that route is provided with by the rtnetlink DLL (dynamic link library).
Usually, after constructing the route of specific routing table, the route of specific routing table is not to come into force, because there is route-caching mechanism in linux system, linux system at first finds packet to arrive the routing iinformation of destination address by route cache fast, and then searches System Routing Table.Therefore, after the route of finishing specific routing table is provided with, need to use the ip_flush_cache interface that route cache is refreshed, the route of specific routing table is come into force.Wherein, described ip_flush_cache interface is that linux system is to carrying out the encapsulation that route cache refreshes by the rtnetlink DLL (dynamic link library).
As shown in Figure 2, described in the step 101 network interface classified and specifically may further comprise the steps:
Suppose that the Linux server has N+1 network interface, is provided with an array element NETSEG[SegCnt] [count], wherein SegCnt represents the kind of network interface, count represents the number of similar network interface; Network interface is carried out order relatively, suppose that from network interface i the first then initial network interface is network interface i.
Here, second network interface is from network interface i+1.
Step 207 judges whether current first network interface is last network interface, if, then finish current relatively flow process, otherwise, execution in step 208.
For realizing said method, the present invention also provides a kind of inking device of multi-gateway Linux server, and this device comprises: network interface configuration acquisition module 301, network interface sort module 302, network interface configuration module 303, tactful routing rule generation module 304, routing table constructing module 305 and route-caching refresh module 306; Wherein,
Network interface configuration acquisition module 301 is used for obtaining by the ioctl_get_allifaddrs interface configuration information of each network interface of Linux server, and sends to network interface sort module 302;
Network interface sort module 302 is used for the network interface configuration information according to 301 acquisitions of network interface configuration acquisition module, and network interface is classified;
Described classification is specially: with the IP address of network interface and subnet mask be operating as keyword, the network interface that keyword is identical is a class; And classification results is stored in the array of setting, the element in the array is the configuration information of network interface, array is the index of network interface.
Network interface configuration module 303 according to network interface sort module 302 sorted network interface configuration informations, by the address of each network interface of ioctl_set_ifaddr interface configuration, comprises IP address and subnet mask, by the route of ioctl_set_route interface configuration network interface;
Strategy routing rule generation module 304 is used to the routing rule of generating strategy;
Here, described tactful routing rule is: according to the IP source address of packet, and inquiry and the corresponding specific routing table of network interface;
Routing table constructing module 305 is used for according to the configuration of tactful routing rule and network interface, constructs the route of specific routing table by the ip_add_route interface, when route is set, the route that is provided with is placed in the specific routing table of appointment;
Described specific routing table is that linux system is default, the unique corresponding specific routing table of each network interface, and the sequence number of specific routing table is according in network interface sort module 302 classification results, and the index of network interface in array increases progressively.
Route-caching refresh module 306 is used for by the ip_flush_cache interface route cache being refreshed, and the route of specific routing table is come into force.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. the collocation method of a multi-gateway Linux server is characterized in that, this method comprises:
Obtain the configuration information of each network interface of Linux server, network interface is classified according to configuration information;
Reconfigure the address and the route of each network interface;
The Provisioning Policy routing rule according to tactful routing rule and the specific routing table of network interface arrangement, and refreshes route-caching.
2. collocation method according to claim 1 is characterized in that, described network interface the classification according to configuration information comprises:
With the IP address of network interface and subnet mask be operating as keyword, the network interface that keyword is identical is divided into a class, and classification results is stored in the array, the element in the array is the configuration information of network interface, array is the index of network interface.
3. collocation method according to claim 1 and 2 is characterized in that, described tactful routing rule is: linux system is according to the IP source address inquiry specific routing table corresponding with network interface of packet.
4. collocation method according to claim 3 is characterized in that, describedly comprises according to tactful routing rule and the specific routing table of network interface arrangement:
Specified circuit by network interface address, purpose IP address and subnet mask, and specify route be stored in the specific routing table of network interface correspondence therewith; The unique corresponding specific routing table of each network interface.
5. collocation method according to claim 1 and 2 is characterized in that, described address and the route that reconfigures each network interface comprises:
By the ioctl_set_ifaddr interface IP address and the subnet mask of network interface are set, the default route of network interface are set by the ioctl_set_route interface, the network interface address of specify default route, gateway address, and purpose IP address and subnet mask are set to 0.
6. the inking device of a multi-gateway Linux server is characterized in that, comprising:
Network interface configuration acquisition module is used for obtaining the configuration information of each network interface of Linux server, and sends to the network interface sort module;
The network interface sort module is used for the network interface configuration information according to the acquisition of network interface configuration acquisition module, and network interface is classified;
The network interface configuration module is used for reconfiguring the address and the route of each network interface according to sorted network interface configuration information;
Strategy routing rule generation module is used for the Provisioning Policy routing rule;
The routing table constructing module is used for according to tactful routing rule and the specific routing table of network interface arrangement;
The route-caching refresh module is used to refresh route-caching.
7. inking device according to claim 6 is characterized in that, described network interface configuration module is by the IP address and the subnet mask of ioctl_set_ifaddr interface configuration network interface, by the route of ioctl_set_route interface configuration network interface.
8. according to claim 6 or 7 described inking devices, it is characterized in that described tactful routing rule is: according to the IP source address inquiry and the corresponding specific routing table of network interface of packet;
The specific routing table of described structure comprises: specified circuit by network interface address, purpose IP address and subnet mask, and specify route be stored in the specific routing table of network interface correspondence therewith; The unique corresponding specific routing table of each network interface.
9. according to claim 6 or 7 described inking devices, it is characterized in that, described network interface sort module, with the IP address of network interface and subnet mask be operating as keyword, the network interface that keyword is identical is divided into a class, and classification results is stored in the array of setting.
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