HashCache: High-Performance State Tracking for Resilient FPGA-based Packet Processing

High-speed network packet processing is of paramount importance for many aspects of our society. We present HashCache, a new state tracking approach well suited for FPGA implementation. HashCache is a hash-based key-value store which combines high speed state lookup and update rates by utilizing a novel eviction strategy called Not Recently Sequenced. We demonstrate that our FPGA-based HashCache implementation is able to statefully process 200 MPPS of full duplex traffic both with benign data and in an attack scenario.