--- /dev/null
+/*!\file netinet/igmp.h
+ * Internet Group Managment Protocol.
+ */
+
+/*
+ * Copyright (c) 1988 Stephen Deering.
+ * Copyright (c) 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Stephen Deering of Stanford University.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * @(#)igmp.h 8.1 (Berkeley) 6/10/93
+ * $Id: igmp.h,v 1.7 1996/03/14 16:59:17 fenner Exp $
+ */
+
+#ifndef __NETINET_IGMP_H
+#define __NETINET_IGMP_H
+
+/*
+ * Internet Group Management Protocol (IGMP) definitions.
+ *
+ * Written by Steve Deering, Stanford, May 1988.
+ *
+ * MULTICAST Revision: 3.5.1.2
+ */
+
+/*
+ * IGMP packet format.
+ */
+
+#include <sys/packon.h>
+
+struct igmp {
+ u_char igmp_type; /* version & type of IGMP message */
+ u_char igmp_code; /* subtype for routing msgs */
+ u_short igmp_cksum; /* IP-style checksum */
+ struct in_addr igmp_group; /* group address being reported */
+}; /* (zero for queries) */
+
+#include <sys/packoff.h>
+
+#define IGMP_MINLEN 8
+
+/*
+ * Message types, including version number.
+ */
+#define IGMP_MEMBERSHIP_QUERY 0x11 /* membership query */
+#define IGMP_V1_MEMBERSHIP_REPORT 0x12 /* Ver. 1 membership report */
+#define IGMP_V2_MEMBERSHIP_REPORT 0x16 /* Ver. 2 membership report */
+#define IGMP_V2_LEAVE_GROUP 0x17 /* Leave-group message */
+
+#define IGMP_DVMRP 0x13 /* DVMRP routing message */
+#define IGMP_PIM 0x14 /* PIM routing message */
+
+#define IGMP_MTRACE_RESP 0x1e /* traceroute resp.(to sender)*/
+#define IGMP_MTRACE 0x1f /* mcast traceroute messages */
+
+#define IGMP_MAX_HOST_REPORT_DELAY 10 /* max delay for response to */
+ /* query (in seconds) according */
+ /* to RFC1112 */
+
+
+#define IGMP_TIMER_SCALE 10 /* denotes that the igmp code field */
+ /* specifies time in 10th of seconds*/
+
+/*
+ * The following four defininitions are for backwards compatibility.
+ * They should be removed as soon as all applications are updated to
+ * use the new constant names.
+ */
+#define IGMP_HOST_MEMBERSHIP_QUERY IGMP_MEMBERSHIP_QUERY
+#define IGMP_HOST_MEMBERSHIP_REPORT IGMP_V1_MEMBERSHIP_REPORT
+#define IGMP_HOST_NEW_MEMBERSHIP_REPORT IGMP_V2_MEMBERSHIP_REPORT
+#define IGMP_HOST_LEAVE_MESSAGE IGMP_V2_LEAVE_GROUP
+
+#endif
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