A method of fast data packet filtering
A filtering method and data packet technology, applied in data exchange details, data exchange network, digital transmission system, etc., can solve the problems of small number of filtering rules, limited number of domains, unsteady classification processing time, etc. Constant, low-latency effects
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[0025] In principle, the fast packet filtering method of the present invention is mainly composed of two parts: the preprocessing process of the filtering rules and the classification matching process. The basic idea is to transform multi-dimensional matching into single-dimensional parallel matching, and the result rule set of each dimension matching is taken to obtain a decreasing rule set space after the intersection. In order to facilitate the introduction of technical solutions, first define several algorithm-related concepts:
[0026] Meta-field Chunk, the Chunk in the first stage comes directly from the field specified in the filtering rules. In order to save memory, the width of the Chunk generally does not exceed 16 bits, that is, the source / destination IP address is usually split into high and low 16 bits. , The other Chunks are merged from the upper level Chunk. Other information related to IP packets can also be introduced as Chunk, such as router physical port number,...
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