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+/*
+ * 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_var.h 8.1 (Berkeley) 7/19/93
+ */
+
+/*
+ * Internet Group Management Protocol (IGMP),
+ * implementation-specific definitions.
+ *
+ * Written by Steve Deering, Stanford, May 1988.
+ *
+ * MULTICAST 1.1
+ */
+
+struct igmpstat {
+ u_long igps_rcv_total; /* total IGMP messages received */
+ u_long igps_rcv_tooshort; /* received with too few bytes */
+ u_long igps_rcv_badsum; /* received with bad checksum */
+ u_long igps_rcv_queries; /* received membership queries */
+ u_long igps_rcv_badqueries; /* received invalid queries */
+ u_long igps_rcv_reports; /* received membership reports */
+ u_long igps_rcv_badreports; /* received invalid reports */
+ u_long igps_rcv_ourreports; /* received reports for our groups */
+ u_long igps_snd_reports; /* sent membership reports */
+};
+
+#ifdef KERNEL
+struct igmpstat igmpstat;
+
+/*
+ * Macro to compute a random timer value between 1 and (IGMP_MAX_REPORTING_
+ * DELAY * countdown frequency). We generate a "random" number by adding
+ * the total number of IP packets received, our primary IP address, and the
+ * multicast address being timed-out. The 4.3 random() routine really
+ * ought to be available in the kernel!
+ */
+#define IGMP_RANDOM_DELAY(multiaddr) \
+ /* struct in_addr multiaddr; */ \
+ ( (ipstat.ips_total + \
+ ntohl(IA_SIN(in_ifaddr)->sin_addr.s_addr) + \
+ ntohl((multiaddr).s_addr) \
+ ) \
+ % (IGMP_MAX_HOST_REPORT_DELAY * PR_FASTHZ) + 1 \
+ )
+
+void igmp_init __P(());
+void igmp_input __P((struct mbuf *, int));
+void igmp_joingroup __P((struct in_multi *));
+void igmp_leavegroup __P((struct in_multi *));
+void igmp_fasttimo __P(());
+#endif