Class: PacketGen::Header::IGMPv3::MQ

Inherits:

Base

• Object
• BinStruct::Struct
• Base
• PacketGen::Header::IGMPv3::MQ

Defined in:

lib/packetgen/header/igmpv3/mq.rb

Overview

IGMPv3 Membership Query.

This is a subpayload for IGMPv3 packets only. This kind of payload is sent by IP multicast routers to query the multicast reception state of neighboring interfaces. Queries has following format:

 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                         Group Address                         |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Resv  |S| QRV |     QQIC      |     Number of Sources (N)     |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                       Source Address [1]                      |
+-                                                             -+
|                       Source Address [2]                      |
+-                              .                              -+
.                               .                               .
.                               .                               .
+-                                                             -+
|                       Source Address [N]                      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Struct are:

• 32-bit #group_addr field (PacketGen::Header::IP::Addr type),

• 4-bit #resv, a reserved field,

• 1-bit #flag_s (Suppress Router-Side Processing),

• 3-bit #qrv (Querier’s Robustness Variable),

• 8-bit #qqic (Querier’s Query Interval Code),

• 16-bit #number_of_sources,

• #source_addr field, a PacketGen::Header::IP::ArrayOfAddr to handle sources addresses.

Author:

• Sylvain Daubert

Since:

• 2.4.0

Instance Attribute Summary

• #flag_s ⇒ Integer

  1-bit S flag (Suppress Router-Side Processing).

• #group_addr ⇒ IP::Addr

  IP Group address.

• #number_of_sources ⇒ Integer

  16-bit Number of Sources in #source_addr.

• #qqic ⇒ Integer

  Get QQIC value.

• #qrv ⇒ Integer

  3-bit Querier’s Robustness Variable.

• #resv ⇒ Integer

  4-bit reserved field.

• #source_addr ⇒ IP::ArrayOfAddr

  Array of IP source addresses.

• #u8 ⇒ Integer

  First 8-bit field, composed of #resv, #flag_s and #qrv.

Method Summary

Methods inherited from Base

bind, calculate_and_set_length, #header_id, inherited, #initialize, #ip_header, #ll_header

Methods included from PacketGen::Headerable

#added_to_packet, included, #method_name, #packet, #packet=, #parse?, #protocol_name, #read, #to_s

Constructor Details

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

Instance Attribute Details

#flag_s ⇒ Integer

1-bit S flag (Suppress Router-Side Processing)

Returns:

• (Integer)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 60

define_bit_attr :u8, resv: 4, flag_s: 1, qrv: 3

#group_addr ⇒ IP::Addr

IP Group address

Returns:

• (IP::Addr)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 47

define_attr :group_addr, IP::Addr, default: '0.0.0.0'

#number_of_sources ⇒ Integer

16-bit Number of Sources in #source_addr

Returns:

• (Integer)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 68

define_attr :number_of_sources, BinStruct::Int16

#qqic ⇒ Integer

Note:

May return a different value from value previously set, as a float encoding is used to encode big values. See PacketGen::Header::IGMPv3.decode.

Get QQIC value

Returns:

• (Integer)

Since:

• 2.4.0

# File 'lib/packetgen/header/igmpv3/mq.rb', line 64

define_attr :qqic, BinStruct::Int8

#qrv ⇒ Integer

3-bit Querier’s Robustness Variable

Returns:

• (Integer)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 60

define_bit_attr :u8, resv: 4, flag_s: 1, qrv: 3

#resv ⇒ Integer

4-bit reserved field

Returns:

• (Integer)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 60

define_bit_attr :u8, resv: 4, flag_s: 1, qrv: 3

#source_addr ⇒ IP::ArrayOfAddr

Array of IP source addresses

Returns:

• (IP::ArrayOfAddr)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 73

define_attr :source_addr, IP::ArrayOfAddr,
builder: ->(h, t) { t.new(counter: h[:number_of_sources]) }

#u8 ⇒ Integer

First 8-bit field, composed of #resv, #flag_s and #qrv

Returns:

• (Integer)

# File 'lib/packetgen/header/igmpv3/mq.rb', line 60

define_bit_attr :u8, resv: 4, flag_s: 1, qrv: 3