Selective Acknowlegment OK option.

www.networksorcery.com/enp/protocol/tcp/option004.htm

Methods
D
N
Class Public methods
new(args={})

Source: show 

# File lib/packetfu/protos/tcp.rb, line 393
                        def initialize(args={})
                                super(
                                        args.merge(:kind => 4,
                                                                                 :optlen => 2)
                                )
                        end
Instance Public methods
decode()

SACKOK options with sizes other than 2 are malformed.

Source: show 

# File lib/packetfu/protos/tcp.rb, line 401
                        def decode
                                if self[:optlen].to_i == 2
                                        "SACKOK"
                                else
                                        "SACKOK-bad:#{self[:value]}"
                                end
                        end