The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/igmp_var.h

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    1 /*-a
    2  * Copyright (c) 1988 Stephen Deering.
    3  * Copyright (c) 1992, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  *
    6  * This code is derived from software contributed to Berkeley by
    7  * Stephen Deering of Stanford University.
    8  *
    9  * Redistribution and use in source and binary forms, with or without
   10  * modification, are permitted provided that the following conditions
   11  * are met:
   12  * 1. Redistributions of source code must retain the above copyright
   13  *    notice, this list of conditions and the following disclaimer.
   14  * 2. Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in the
   16  *    documentation and/or other materials provided with the distribution.
   17  * 4. Neither the name of the University nor the names of its contributors
   18  *    may be used to endorse or promote products derived from this software
   19  *    without specific prior written permission.
   20  *
   21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   31  * SUCH DAMAGE.
   32  *
   33  *      from: @(#)igmp_var.h    8.1 (Berkeley) 7/19/93
   34  * $FreeBSD: src/sys/netinet/igmp_var.h,v 1.21 2005/01/07 01:45:44 imp Exp $
   35  */
   36 
   37 #ifndef _NETINET_IGMP_VAR_H_
   38 #define _NETINET_IGMP_VAR_H_
   39 
   40 /*
   41  * Internet Group Management Protocol (IGMP),
   42  * implementation-specific definitions.
   43  *
   44  * Written by Steve Deering, Stanford, May 1988.
   45  *
   46  * MULTICAST Revision: 3.5.1.3
   47  */
   48 
   49 struct igmpstat {
   50         u_int   igps_rcv_total;         /* total IGMP messages received */
   51         u_int   igps_rcv_tooshort;      /* received with too few bytes */
   52         u_int   igps_rcv_badsum;        /* received with bad checksum */
   53         u_int   igps_rcv_queries;       /* received membership queries */
   54         u_int   igps_rcv_badqueries;    /* received invalid queries */
   55         u_int   igps_rcv_reports;       /* received membership reports */
   56         u_int   igps_rcv_badreports;    /* received invalid reports */
   57         u_int   igps_rcv_ourreports;    /* received reports for our groups */
   58         u_int   igps_snd_reports;       /* sent membership reports */
   59 };
   60 
   61 #ifdef _KERNEL
   62 #define IGMP_RANDOM_DELAY(X) (random() % (X) + 1)
   63 
   64 /*
   65  * States for IGMPv2's leave processing
   66  */
   67 #define IGMP_OTHERMEMBER                        0
   68 #define IGMP_IREPORTEDLAST                      1
   69 
   70 /*
   71  * We must remember what version the subnet's querier is.
   72  * We conveniently use the IGMP message type for the proper
   73  * membership report to keep this state.
   74  */
   75 #define IGMP_V1_ROUTER                          IGMP_V1_MEMBERSHIP_REPORT
   76 #define IGMP_V2_ROUTER                          IGMP_V2_MEMBERSHIP_REPORT
   77 
   78 /*
   79  * Revert to new router if we haven't heard from an old router in
   80  * this amount of time.
   81  */
   82 #define IGMP_AGE_THRESHOLD                      540
   83 
   84 void    igmp_init(void);
   85 void    igmp_input(struct mbuf *, int);
   86 void    igmp_joingroup(struct in_multi *);
   87 void    igmp_leavegroup(struct in_multi *);
   88 void    igmp_fasttimo(void);
   89 void    igmp_slowtimo(void);
   90 
   91 SYSCTL_DECL(_net_inet_igmp);
   92 
   93 #endif
   94 
   95 /*
   96  * Names for IGMP sysctl objects
   97  */
   98 #define IGMPCTL_STATS           1       /* statistics (read-only) */
   99 #define IGMPCTL_MAXID           2
  100 
  101 #define IGMPCTL_NAMES { \
  102         { 0, 0 }, \
  103         { "stats", CTLTYPE_STRUCT }, \
  104 }
  105 #endif

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