导　　师： 胡飞

学科专业： 081202

授予学位： 硕士

作　　者： ;

机构地区： 西北工业大学

摘　　要： 随着各种网络技术的迅速发展,电信运营商将为用户提供越来越多应用服务,在移动用户对信息需求不断增加和日趋复杂的同时,服务提供商们也推出了相应的各种计费标准。因此,运营商与服务提供商之间的网关成为电信计费领域的一个新的研究热点。使用Linux系统,可以在计费网关上为电信运营商和服务提供商提供一种全新的解决方案。 本文设计了一个由认证服务器提供授权,在Linux计费网关上处理客户资费信息的计费模型,实现了一种在x86硬件上使用Linux内核进行包过滤的计费方法,论文的主要研究与实现工作有: 1.使用Netfilter框架,完成了网络层的数据包重组、传输层的报文排序接收以及应用层的报文头分析; 2.实现了在内核中对HTTP协议的数据流进行解析及过滤,并提取出计费所需的重要信息; 3.在网络层使用连接重定向技术,将认证与授权工作转交认证服务器完成; 4.设计双层计费规则链,基于LKM的计费规则模块可以灵活地增加与删除; 5.应用NetlinK技术,实现了内核态与用户态程序之间的自定义的套接字报文格式,并用于传输计费结果; 6.使用x86电信服务器对系统原型进行了实例测试,通过性能分析,证明了该系统的可用性。 本文的系统原型具备了为电信服务运营商所采用的实现依据,通过进一步的需求分析和设计可以提供高效灵活的计费功能,具有电信级的实用价值。 While the rapid progress of the networking technology, The Network Provider will enable to offer more and more application service to the users, thus the router in-between the Network Provider and the Service Providers has become a new field that is involved in the accounting technique. With the information requirement of mobile user continual increased and become more complicated, the Service Providers has developed new accounting rules for the mobile users. With professional networking ability of Linux, a new solution for the Network Providers and the Service Providers to do the accounting is provided in the thesis.We have designed a way in using the x86 hardware to run the carrier grade accounting router in the thesis, which use the Netfilter in the Linux kernel.The main research works are as follows:1. Using the Netfilter framework, dada pack recombine in network level were implemented.2. Our kernel module use Netlink socket to communicate with the user application while the Netfilter to do the application protocol analysis and filtering.3. We use a connection redirection method to redirect the Authentication and Authorization to the Authentication server,4. Designed a highly effective algorithm in managing the accounting rules.5. With Netlink technique, implemented a specified socket between the kernel space and the user space, and produce the prising results.6. Finally we tested the prototype of the accounting router system with carrier grade x86 server, and proved the availability with the performance data.The System prototype is proved available for the telecom network providers, with an advanced prising functionality;it's a practical and valuable telcom carrier grade prising router.

关 键 词： 内核 电信 网络 计费网关

领　　域： [电子电信] [电子电信]