Class: PacketGen::Header::IPv6::HopByHop

Inherits:

Extension

• Object
• Types::Fields
• Base
• Extension
• PacketGen::Header::IPv6::HopByHop

Defined in:

lib/packetgen/header/ipv6/hop_by_hop.rb

Overview

Hop-by-hop IPv6 extension

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|  Next Header  |  Hdr Ext Len  |                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+                               +
|                                                               |
.                                                               .
.                            Options                            .
.                                                               .
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Hop-by-hop IPv6 extension header consists of:

• a Extension#next header field (Types::Int8),

• a Extension#length field (Types::Int8),

• an #options field (Options),

• and a Extension#body, containing next header.

Author:

• Sylvain Daubert

Instance Attribute Summary

• #options ⇒ Options

  Specific options of extension header.

Attributes inherited from Extension

#body, #length, #next

Attributes inherited from Base

#packet

Instance Method Summary

• #read(str) ⇒ self

  Populate object from a binary string.

Methods inherited from Extension

#calc_length, #real_length

Methods inherited from Base

#added_to_packet, bind, bind_header, calculate_and_set_length, #header_id, inherited, #initialize, #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, fields, #force_binary, inherited, #initialize, #inspect, #is_optional?, #is_present?, #offset_of, #optional?, #optional_fields, #present?, remove_bit_fields_on, remove_field, #sz, #to_h, #to_s, update_field

Constructor Details

This class inherits a constructor from PacketGen::Header::Base

Instance Attribute Details

#options ⇒ Options

Specific options of extension header

Returns:

• (Options)

# File 'lib/packetgen/header/ipv6/hop_by_hop.rb', line 114

define_field_before :body, :options, Options

Instance Method Details

#read(str) ⇒ self

Populate object from a binary string

Parameters:

• str (String)

Returns:

• (self)

# File 'lib/packetgen/header/ipv6/hop_by_hop.rb', line 119

def read(str)
  return self if str.nil?
  force_binary str
  self[:next].read str[0, 1]
  self[:length].read str[1, 1]
  self[:options].read str[2, real_length - 2]
  self[:body].read str[real_length..-1]
  self
end