Class: PacketGen::Header::Dot11::Data

Inherits:
PacketGen::Header::Dot11 show all
Defined in:
lib/packetgen/header/dot11/data.rb

Overview

IEEE 802.11 data frame header

This class make a PacketGen::Header::Dot11 header with #type set to 2 (data frame).

A IEEE 802.11 data header consists of:

Author:

  • Sylvain Daubert

Since:

  • 1.4.0

Constant Summary

Constants inherited from PacketGen::Header::Dot11

TYPES

Instance Attribute Summary

Attributes inherited from PacketGen::Header::Dot11

#body, #fcs, #fragment_number, #frame_ctrl, #from_ds, #ht_ctrl, #id, #mac1, #mac2, #mac3, #mac4, #md, #mf, #order, #proto_version, #pwmngt, #qos_ctrl, #retry, #sequence_ctrl, #sequence_number, #subtype, #to_ds, #type, #wep

Attributes inherited from Base

#packet

Instance Method Summary collapse

Methods inherited from PacketGen::Header::Dot11

#added_to_packet, #calc_checksum, #fields, has_fcs, has_fcs=, #human_type, #inspect, #old_fields, #old_read, #read, #to_s, #to_w

Methods inherited from Base

#added_to_packet, bind, bind_header, calculate_and_set_length, #header_id, inherited, #ip_header, known_headers, #ll_header, #method_name, #parse?, #protocol_name, protocol_name

Methods inherited from Types::Fields

#[], #[]=, #bits_on, #body=, define_bit_fields_on, define_field, define_field_after, define_field_before, delete_field, #fields, #force_binary, inherited, #inspect, #is_optional?, #is_present?, #offset_of, #optional?, #optional_fields, #present?, #read, #sz, #to_h, #to_s

Constructor Details

#initialize(options = {}) ⇒ Data

Returns a new instance of Data.

Parameters:

  • options (Hash) (defaults to: {})

See Also:

Since:

  • 1.4.0



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# File 'lib/packetgen/header/dot11/data.rb', line 31

def initialize(options={})
  super({ type: 2 }.merge!(options))
  @applicable_fields -= %i[mac4 qos_ctrl ht_ctrl]
  define_applicable_fields
end

Instance Method Details

#reply! ⇒ Object

Invert source and destination addresses (see Table 8-19 from IEEE 802.11-2012 document to known which MAC is SA, and which one is DA). Also invert Receiver and Transmitter address in case ToDS and FromDS are true.

Since:

  • 1.4.0



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# File 'lib/packetgen/header/dot11/data.rb', line 42

def reply!
  ds = frame_ctrl & 3
  case ds
  when 0
    # MAC1: RA/DA, MAC2: TA/SA
    self[:mac1], self[:mac2] = self[:mac2], self[:mac1]
  when 1
    # MAC1: RA/BSSID, MAC2: TA/SA, MAC3: DA
    self[:mac2], self[:mac1] = self[:mac1], self[:mac2]
    self.to_ds = false
    self.from_ds = true
  when 2
    # MAC1: RA/DA, MAC2: BSSID, MAC3: SA or BSSID
    self[:mac1], self[:mac2] = self[:mac2], self[:mac1]
    self.to_ds = true
    self.from_ds = false
  when 3
    # MAC1: RA, MAC2: TA
    self[:mac1], self[:mac2] = self[:mac2], self[:mac1]
    # MAC3: DA, MAC4: SA
    self[:mac4], self[:mac3] = self[:mac3], self[:mac4]
  end
  self
end