System and method for very fast IP packet filtering
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United States of America Patent
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-
Jan 30, 2001
Grant Date -
N/A
app pub date -
Aug 17, 1998
filing date -
Aug 17, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Small, optimized sequences of binary 6-tuples representing filter rules achieve very fast IP packet filtering. Filtering IP packets received from a caller at the physical interface to an operating system kernel is accomplished by processing FILTER rule statements entered by a user in a rules file to generate 6-tuple filtering rules, each of the 6-tuple filtering rules including an operator index; resolving relative and symbolic indexes in these 6-tuples filtering rules to form resolved filtering rules and loading the resolved filtering rules to the operating system kernal; and interpreting the resolved filtering rules for each IP packet received at the physical interface.
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