FORTRESS: An Efficient and Distributed Firewall for Stateful Data Plane SDN

Table 5

XFSM table.

XFSM Table
Match Flags		Actions
State	Event	Actions	Next State
Default	SYN = 1	Forward	Second Handshake
Default	SYN 1	Drop	/
Second Handshake	SYN = 1 & ACK = 1	Forward	Third Handshake
Third Handshake	ACK = 1	Forward	Connected
Connected	FIN 1	Forward	/
Connected	FIN = 1	Forward	Default
⋅	⋅	⋅	⋅
⋅	⋅	⋅	⋅
⋅	⋅	⋅	⋅
First Handshake	SYN 1	Drop	/
Second Handshake	SYN 1 ACK 1	Drop	/
Third Handshake	ACK 1	Drop	/