High-performance packet filtering with pflua

“Pflua implements the well-known libpcap packet filtering language, which we call pflang for short.

Unlike other packet filtering toolkits, which tend to use the libpcap library to compile pflang expressions bytecode to be run by the kernel, Pflua is a completely new implementation of pflang…”

http://wingolog.org/archives/2014/09/02/high-performance-packet-filtering-with-pflua