igmp_var.h

早期freebsd实现

/*
 * 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