可重构交换机报文解析器的设计

Design of a Reconfigurable Parser for Switches

将以太网交换机转发引擎芯片处理网络数据帧作为研究背景.为满足解析和提取报文关键字段的需求,设计了一种支持软件定义网络(SDN)的可重构报文解析器.该解析器由若干个结构相同的基本处理单元(PE)和一个提取单元(extractor)级联而成,其中每一个基本处理单元负责解析一层协议的报文头部,它的个数取决于待处理网络协议的层级数.解析器能够实现对网络数据帧关键字段的完整解析和提取.为验证解析器的功能,根据网络协议对报文解析器进行了实例化,同时将网络封包分析软件撷取的真实网络封包作为输入数据帧,进行功能仿真并得到最终的提取结果,与网络封包软件结果进行对比,结果显示一致.

Useing Ethernet switches forwarding engine chip for processing network data frame as the research background,a reconfigurable parser was designed which supports the software definition network(SDN)and meets the needs of parsing and extract key fields of the network message.The parser is cascaded by a number of same basic processing units(PE)and an extraction unit(extractor).Each basic processing unit is responsible for parsing the a layer of message header in protocol.And the number of the PE unit depends on the layer series of the network protocol processed.Parser can analyse and extract the key field in network data frame.In order to verify the function of the parser,the parser was instantiated according to the network protocol.At the same time,the real network packet captured by the network packet analysis software is used as the input data frame,the function simulation is carried out and the final extraction results are obtained.And the results compared with the network packet software's results are same at end.