IGMP igmpinfo_t Structure

The igmpinfo_t structure is a DTrace translated version of the information contained in the various forms of IGMP header.

typedef struct igmpinfo {
        uint8_t igmp_type;
        uint8_t igmp_code;
        uint16_t igmp_checksum;
        string igmp_group_addr;
        uint8_t igmp_query_version;
        uint8_t igmp_v3_query_max_response_time;
        uint16_t igmp_v3_query_num_sources;
        uintptr_t igmp_v3_query_sources;
        uint16_t igmp_v3_report_num_records;
        struct grphdr *igmp_v3_report_records;
        struct igmp *igmp_hdr;
} igmpinfo_t;

Table 11-46 List of IGMP igmpinfo_t Members

Member	Description
igmp_type	IGMP message type.
igmp_code	IGMP message code.
igmp_checksum	Checksum of IGMP header and payload.
igmp_group_addr	String representation of IGMP multicast group address. Not valid for IGMPv3 membership reports.
igmp_query_version	For an IGMP membership query, this field is set to 1, 2, or 3. Otherwise 0.
igmp_v3_query_max_response_time	Valid for an IGMPv3 membership query.
igmp_v3_query_num_sources	Number of IPv4 addresses specifying sources for group-and-source queries.
igmp_v3_query_sources	Array of IPv4 addresses specifying sources for group-and-source queries.
igmp_v3_report_num_records	Number of IGMPv3 group records specifying sources for group-and-source queries.
igmp_v3_report_records	Array of IGMPv3 group records specifying group and sources for group-and-source reports.
igmp_hdr	Pointer to raw IGMP header at time of tracing.

For more information about the various IGMP message header formats, see RFCs 1112, 2236, and 3376.