The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: 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 /*
    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  * 3. All advertising materials mentioning features or use of this software
   18  *    must display the following acknowledgement:
   19  *      This product includes software developed by the University of
   20  *      California, Berkeley and its contributors.
   21  * 4. Neither the name of the University nor the names of its contributors
   22  *    may be used to endorse or promote products derived from this software
   23  *    without specific prior written permission.
   24  *
   25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   35  * SUCH DAMAGE.
   36  *
   37  *      from: @(#)igmp_var.h    8.1 (Berkeley) 7/19/93
   38  * $FreeBSD: src/sys/netinet/igmp_var.h,v 1.17 1999/12/29 04:40:59 peter Exp $
   39  * $DragonFly: src/sys/netinet/igmp_var.h,v 1.6 2006/09/03 18:52:29 dillon Exp $
   40  */
   41 
   42 #ifndef _NETINET_IGMP_VAR_H_
   43 #define _NETINET_IGMP_VAR_H_
   44 
   45 #ifndef _SYS_TYPES_H_
   46 #include <sys/types.h>
   47 #endif
   48 
   49 #ifdef _KERNEL
   50 
   51 #ifndef _SYS_SYSCTL_H_
   52 #include <sys/sysctl.h>
   53 #endif
   54 
   55 #endif
   56 
   57 /*
   58  * Internet Group Management Protocol (IGMP),
   59  * implementation-specific definitions.
   60  *
   61  * Written by Steve Deering, Stanford, May 1988.
   62  *
   63  * MULTICAST Revision: 3.5.1.3
   64  */
   65 
   66 struct igmpstat {
   67         u_int   igps_rcv_total;         /* total IGMP messages received */
   68         u_int   igps_rcv_tooshort;      /* received with too few bytes */
   69         u_int   igps_rcv_badsum;        /* received with bad checksum */
   70         u_int   igps_rcv_queries;       /* received membership queries */
   71         u_int   igps_rcv_badqueries;    /* received invalid queries */
   72         u_int   igps_rcv_reports;       /* received membership reports */
   73         u_int   igps_rcv_badreports;    /* received invalid reports */
   74         u_int   igps_rcv_ourreports;    /* received reports for our groups */
   75         u_int   igps_snd_reports;       /* sent membership reports */
   76 };
   77 
   78 #ifdef _KERNEL
   79 #define IGMP_RANDOM_DELAY(X) (krandom() % (X) + 1)
   80 
   81 /*
   82  * States for IGMPv2's leave processing
   83  */
   84 #define IGMP_OTHERMEMBER                        0
   85 #define IGMP_IREPORTEDLAST                      1
   86 
   87 /*
   88  * We must remember what version the subnet's querier is.
   89  * We conveniently use the IGMP message type for the proper
   90  * membership report to keep this state.
   91  */
   92 #define IGMP_V1_ROUTER                          IGMP_V1_MEMBERSHIP_REPORT
   93 #define IGMP_V2_ROUTER                          IGMP_V2_MEMBERSHIP_REPORT
   94 
   95 /*
   96  * Revert to new router if we haven't heard from an old router in
   97  * this amount of time.
   98  */
   99 #define IGMP_AGE_THRESHOLD                      540
  100 
  101 struct mbuf;
  102 struct in_multi;
  103 
  104 void    igmp_init (void);
  105 int     igmp_input (struct mbuf **, int *, int);
  106 void    igmp_joingroup (struct in_multi *);
  107 void    igmp_leavegroup (struct in_multi *);
  108 void    igmp_fasttimo (void);
  109 void    igmp_slowtimo (void);
  110 
  111 SYSCTL_DECL(_net_inet_igmp);
  112 
  113 #endif
  114 
  115 /*
  116  * Names for IGMP sysctl objects
  117  */
  118 #define IGMPCTL_STATS           1       /* statistics (read-only) */
  119 #define IGMPCTL_MAXID           2
  120 
  121 #define IGMPCTL_NAMES { \
  122         { 0, 0 }, \
  123         { "stats", CTLTYPE_STRUCT }, \
  124 }
  125 #endif

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