基于中间点划分无冲突哈希的高速包处理

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1、基于中间点划分无冲突哈希的高速包处理摘要:通过在高速片上存储器上存储所有的攻击特征，实现对数据包的高速检测。针对有限的片上存储器空间，提出一种新的基于中间点划分无冲突哈希函数的trie树结构，将攻击特征串平均分配到trie树每层的多个组中，实现对片上存储器有效的控制。通过在同一个芯片中采用流水并行方式执行查询操作，获得更高的吞吐量。存储中间点的空间复杂度为o(n)，哈希表的构建时间随攻击特征数量线性增长。实验结果表明：该方法降低了片上存储空间需求，在片上存储器只需执行一次即可完成特征匹配操作。关键词:高速包处理;

2、无冲突哈希;中间点划分;trie树;片上存储high.speedpacketprocessingbynon.collisionhashfunctionsbasedonmiddle.pointpartitionzhangmo.hua1*,lige21.schoolofcomputerandinformationengineering,henanuniversityofeconomicsandlaws,zhengzhouhenan450000,china;2.departmentofinformatio

3、nengineer,conservancyvocationalinstituteofnorthchinainstituteofwaterconservancyandhydroelectricpower,zhengzhouhenan450000,chinaabstract:high.speedpacketinspectioncanbeachievedthroughstoringattacksignaturesonthehigh.speedon.chipmemory.concerningthelimitedon.chi

4、pmemory,thispaperproposesanewtriestructurewithnon.collisionhashfunctionsbasedonmiddle.pointpartition.thealgorithmevenlypartitionesattacksignaturesintomutiplegroupsateachlayerintrietreetoachievetheeffectivecontrolofmemory.thetrie.treestructurecanbeimplementedona

5、singlechipandperformqueryoperationsbypipeliningandparallelism,thusachieveshigherthroughput.thespacecomplexofstoringmiddle.pointiso(n)andtheconstructiontimeofhashtableislinearlygrowingwiththenumberofattacksignaturestheexperimentalresultsshowthatthenewstructurede

6、creasesthedemandofon.chipmemoryandcanfacilitateaccesstotheattacksignatureontheon.chipmemorywhileallowingtoperformthesignaturesmatchingoperationsonlyonce.high.speedpacketinspectioncanbeachievedthroughstoringattacksignaturesonthehigh.speedon.chipmemory.concerning

7、thelimitedon.chipmemory,thispaperproposedanewtriestructurewithnon.collisionhashfunctionsbasedonmiddle.pointpartition.thealgorithmevenlypartitionedattacksignaturesintomultiplegroupsateachlayerintrietreetoachievetheeffectivecontrolofmemory.thetrie.treestructureca

8、nbeimplementedonasinglechipandperformqueryoperationsbypipeliningandparallelism,thusachievinghigherthroughput.thespacecomplexofstoringmiddle.pointiso(n)andtheconstruction