Mldv2Query¶

Namespace: inet

class Mldv2Query

MLDv2 Multicast Listener Query (RFC 3810 §5.1, ICMPv6 type 130).

The first 24 bytes coincide with the MLDv1 Query (MldQuery), so an MLDv1 node can parse the common part; an MLDv2 node recognizes the longer form by its length. The inherited maxRespDelay field holds the 16-bit Maximum Response Code (RFC 3810 §5.1.3: 0-32767 in ms, else floating point 1eee mmmm mmmm mmmm).

Usage diagram¶

Inheritance diagram¶

Extends¶

Name	Type	Description
MldMessage	class	Base class for MLDv1 messages (RFC 2710). Carried as ICMPv6 type 130 (Query), 131 (Report), 132 (Done). Inherits type, chksum, and checksumMode from Icmpv6Header.

Fields¶

Name	Type	Description
id	int
mutable	bool
complete	bool
correct	bool
properlyRepresented	bool
chunkLength	b
rawBin	string[]
rawHex	string[]
regionTags	SharingRegionTagSet::TagBaseRegionTag[]
chunkLength
type	Icmpv6Type	1 byte int code; // 1 byte //TODO this should be specific to different ICMP types.
chksum	int	2 bytes
checksumMode	ChecksumMode	4 bytes ‘type’ specific values
code	int	always 0 for MLD (RFC 2710 §3)
maxRespDelay	uint16_t	Maximum Response Delay, ms (16 bits)
reserved	uint16_t	reserved (16 bits, must be 0)
multicastAddress	Ipv6Address	128-bit multicast group address
chunkLength		24 (MLDv1 Query) + 1 (Resv/S/QRV) + 1 (QQIC) + 2 (Nr of Sources); + sourceList*16
type		130
resv	uint8_t	4 bits, reserved
suppressRouterProc	bool	1 bit, S flag (suppress router-side processing)
robustnessVariable	uint8_t	3 bits, QRV (Querier’s Robustness Variable)
queryIntervalCode	uint8_t	8 bits, QQIC (Querier’s Query Interval Code)
sourceList	Ipv6AddressVector	Nr of Sources (16 bits) + N * 128 bits

Properties¶

Name	Value	Description
beforeChange	handleChange()
descriptor	readonly
existingClass
packetData

Source code¶

//
// MLDv2 Multicast Listener Query (RFC 3810 §5.1, ICMPv6 type 130).
//
// The first 24 bytes coincide with the MLDv1 Query (~MldQuery), so an MLDv1 node can
// parse the common part; an MLDv2 node recognizes the longer form by its length. The
// inherited `maxRespDelay` field holds the 16-bit Maximum Response Code (RFC 3810 §5.1.3:
// 0-32767 in ms, else floating point 1eee mmmm mmmm mmmm).
//
class Mldv2Query extends MldMessage
{
    chunkLength = B(28);             // 24 (MLDv1 Query) + 1 (Resv/S/QRV) + 1 (QQIC) + 2 (Nr of Sources); + sourceList*16
    type = ICMPv6_MLD_QUERY;         // 130
    uint8_t resv = 0;                // 4 bits, reserved
    bool suppressRouterProc = false; // 1 bit, S flag (suppress router-side processing)
    uint8_t robustnessVariable = 0;  // 3 bits, QRV (Querier's Robustness Variable)
    uint8_t queryIntervalCode = 0;   // 8 bits, QQIC (Querier's Query Interval Code)
    Ipv6AddressVector sourceList;    // Nr of Sources (16 bits) + N * 128 bits
}

File: src/inet/networklayer/icmpv6/Mldv2Message.msg