CN102891810A - Method for dynamically distributing satellite channels by modifying Internet protocol (IP) message header - Google Patents

Abstract

The invention discloses a method for dynamically distributing satellite channels by modifying an Internet protocol (IP) message header. The method comprises the following steps of: 1, acquiring an Ethernet data packet of a network card; 2, detecting the data packet, if the data packet is an IP message and is in an IP4V version, executing the step 3, otherwise, receiving and returning the data packet; 3, judging whether an IP header protocol type is a generic routing encapsulation (GRE) message type, if so, executing the step 4, otherwise, receiving and returning the IP header protocol type; 4, resolving a protocol type in a GRE message header of the packet, if the protocol type is a multiple protocol label switching (MPLS) message, executing the step 5, and if the protocol type is the IP message, receiving and returning the protocol type; 5, resolving an MPLS packet header, acquiring an S mark bit which represents a stack bottom, wherein value 1 is the stack bottom, if the S mark bit is the stack bottom, executing the step 6, otherwise, executing the step 9; 6, if the MPLS message comprises a transmission control protocol (TCP) message, judging whether the TCP message is a service message, if so, executing the step 7, otherwise, receiving and returning the TCP message; and 7, modifying a tos domain of the IP header on the outermost layer of the overall message to be an appointed value.

Description

A kind of method that realizes the satellite channel dynamic assignment by revising the IP heading

Technical field

The present invention relates to the communication gate technical field, a kind of method that realizes the satellite channel dynamic assignment by revising the IP heading is provided.

Background technology

Gateway is in the Traffic Channel dynamic allocation procedure of supporting satellite modem, need and to carry out ip tos attribute modification through gateway to the data of satellite modem, so that satellite modem can come dynamic construction satellite business channel according to the business datum message that contains corresponding tos value, and through in the data of satellite channel, the data message that relates generally to is divided into two classes: the first kind is routing protocol data, i.e. ospf, ldp, bgp, the gre message; Equations of The Second Kind is business datum, i.e. MPLS-VPN message, and wherein common ground is that all route and business datums all are to be encapsulated by the GRE message.Modification to the business datum message that relates to, come the deal with data message by structure linux driver module, rather than carry out the method revised again after the data packet capturing by application layer packet capturing software, because, revise this method of ip data head by the inner nuclear layer module, shorten the bang path of data message in whole software systems, improved the treatment effeciency of gateway system.

Summary of the invention

The object of the present invention is to provide a kind of method that realizes the satellite channel dynamic assignment by revising the IP heading.

The present invention is to achieve these goals by the following technical solutions:

A kind of method that realizes the satellite channel dynamic assignment by revising the IP heading is characterized in that may further comprise the steps:

1) obtains network interface card Ethernet data bag;

2) detect the Ethernet data bag, detect into the IP message and for the IP4V version, then carry out step 3, otherwise receive and return;

3) judge whether the protocol type in the IP head is the GRE type of message, as then carry out step 4 for the GRE type of message, otherwise receive and return;

4) resolve the protocol type that wraps in the GRE heading, as then carry out step 5 for the MPLS message, as then receiving and return for the IP message;

5) resolve MPLS packet header, obtain the S flag bit, at the bottom of S is masked as expression and whether is stack, at the bottom of value 1 is stack; As for carry out step 6 at the bottom of the stack, not for carry out step 9 at the bottom of the stack;

6) if MPLS message that message comprises is the TCP message, judgement is that meat is service message, as carry out step 7 for service message, receives during for non-service message and returns;

7) outermost layer IP tos territory of the whole message of modification is designated value.

The present invention has following beneficial effect:

By arranging or change COS (the Type of Service of packet, TOS) field etc., value of statistical indicant is set in bag, utilize this value of statistical indicant can carry out limit bandwidth and classified inquiry, therefore, satellite link can be designed to: when out-of-date without professional data communication device, all packets are walked the signalling path of satellite link, and work as business datum MPLS message through out-of-date, will trigger service channel.This design has well improved the utilance of satellite bandwidth.

Description of drawings

Fig. 1 is logic block-diagram of the present invention.

Embodiment

Below the present invention will be further explained the explanation:

A kind of method that realizes the satellite channel dynamic assignment by revising the IP heading is characterized in that may further comprise the steps:

1) obtains network interface card Ethernet data bag;

2) detect the Ethernet data bag, detect into the IP message and for the IP4V version, then carry out step 3, otherwise receive and return;

3) judge whether the protocol type in the IP head is the GRE type of message, as then carry out step 4 for the GRE type of message, otherwise receive and return;

4) resolve the protocol type that wraps in the GRE heading, as then carry out step 5 for the MPLS message, as then receiving and return for the IP message;

5) resolve MPLS packet header, obtain the S flag bit, at the bottom of S is masked as expression and whether is stack, at the bottom of value 1 is stack; As for carry out step 6 at the bottom of the stack, not for carry out step 9 at the bottom of the stack;

6) if MPLS message that message comprises is the TCP message, determine whether service message, as carry out step 7 for service message, receive during for non-service message and return;

7) outermost layer IP tos territory of the whole message of modification is designated value.

Claims (1)

1. one kind is passed through to revise the method that the IP heading is realized the satellite channel dynamic assignment, it is characterized in that may further comprise the steps:

1) obtains network interface card Ethernet data bag;

2) detect the Ethernet data bag, detect into the IP message and for the IP4V version, then carry out step 3, otherwise receive and return;

3) judge whether the protocol type in the IP head is the GRE type of message, as then carry out step 4 for the GRE type of message, otherwise receive and return;

4) resolve the protocol type that wraps in the GRE heading, as then carry out step 5 for the MPLS message, as then receiving and return for the IP message;

5) resolve MPLS packet header, obtain the S flag bit, at the bottom of S is masked as expression and whether is stack, at the bottom of value 1 is stack; As for carry out step 6 at the bottom of the stack, not for carry out step 9 at the bottom of the stack;

6) if MPLS message that message comprises is the TCP message, judgement is that meat is service message, as carry out step 7 for service message, receives during for non-service message and returns;

7) outermost layer IP tos territory of the whole message of modification is designated value.

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