Implements the Explict Congestion Notification for TCPHeader.

Header Definition

 Fixnum (1 bit)  :n
 Fixnum (1 bit)  :c
 Fixnum (1 bit)  :e
Methods
N
R
T
Included Modules
Class Public methods
new(args={})

Source: show 

# File lib/packetfu/protos/tcp.rb, line 15
                def initialize(args={})
                        super(args[:n], args[:c], args[:e]) if args
                end
Instance Public methods
read(str)

Reads a string to populate the object.

Source: show 

# File lib/packetfu/protos/tcp.rb, line 26
                def read(str)
                        force_binary(str)
                        return self if str.nil? || str.size < 2
                        if 1.respond_to? :ord
                                byte1 = str[0].ord
                                byte2 = str[1].ord
                        else
                                byte1 = str[0]
                                byte2 = str[1]
                        end
                        self[:n] = byte1 & 0b00000001 == 0b00000001 ? 1 : 0
                        self[:c] = byte2 & 0b10000000 == 0b10000000 ? 1 : 0
                        self[:e] = byte2 & 0b01000000 == 0b01000000 ? 1 : 0
                        self
                end
to_i()

Returns the TcpEcn field as an integer... even though it’s going to be split across a byte boundary.

Source: show 

# File lib/packetfu/protos/tcp.rb, line 21
                def to_i
                        (n.to_i << 2) + (c.to_i << 1) + e.to_i
                end