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 rapid packet filtering method of the present invention is mainly composed of two parts: a preprocessing process of filtering rules and a classification matching process. The basic idea is to convert multi-dimensional matching into single-dimensional parallel matching, and obtain a decreasing rule set space after the intersection of the result rule sets of each dimension matching. In order to facilitate the introduction of technical solutions, a few algorithm-related concepts are first defined:
[0026] Meta field Chunk, the first stage of the Chunk directly from the field specified in the filter rule, in order to save memory, generally the width of the Chunk does not exceed 16 bits, that is, the source / destination IP address is usually split into two Chunks of high and low 16 bits , the other Chunk is merged from the previous level Chunk. Other information related to IP packets can also be imported as Chunk, such as router physical port numbers, user ...
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