usr.sbin/mrouted/igmpv2.h

   1 /*
   2  * The mrouted program is covered by the license in the accompanying file
   3  * named "LICENSE".  Use of the mrouted program represents acceptance of
   4  * the terms and conditions listed in that file.
   5  *
   6  * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
   7  * Leland Stanford Junior University.
   8  *
   9  *
  10  * igmpv2.h,v 3.8.4.1 1997/11/18 23:25:58 fenner Exp
  11  */
  12
  13 /*
  14  * Constants for IGMP Version 2.  Several of these, especially the
  15  * robustness variable, should be variables and not constants.
  16  */
  17 #define IGMP_ROBUSTNESS_VARIABLE                2
  18 #define IGMP_QUERY_INTERVAL                     125
  19 #define IGMP_QUERY_RESPONSE_INTERVAL            10
  20 #define IGMP_GROUP_MEMBERSHIP_INTERVAL          (IGMP_ROBUSTNESS_VARIABLE * \
  21                                         IGMP_QUERY_INTERVAL + \
  22                                         IGMP_QUERY_RESPONSE_INTERVAL)
  23 #define IGMP_OTHER_QUERIER_PRESENT_INTERVAL     (IGMP_ROBUSTNESS_VARIABLE * \
  24                                         IGMP_QUERY_INTERVAL + \
  25                                         IGMP_QUERY_RESPONSE_INTERVAL / 2)
  26                                                 /* Round to the nearest TIMER_INTERVAL */
  27 #define IGMP_STARTUP_QUERY_INTERVAL             (((IGMP_QUERY_INTERVAL / 4) \
  28                                                         / TIMER_INTERVAL) * TIMER_INTERVAL)
  29 #define IGMP_STARTUP_QUERY_COUNT                IGMP_ROBUSTNESS_VARIABLE
  30 #define IGMP_LAST_MEMBER_QUERY_INTERVAL         1
  31 #define IGMP_LAST_MEMBER_QUERY_COUNT            IGMP_ROBUSTNESS_VARIABLE
  32
  33 /*
  34  * OLD_AGE_THRESHOLD is the number of IGMP_QUERY_INTERVAL's to remember the
  35  * presence of an IGMPv1 group member.  According to the IGMPv2 specification,
  36  * routers remember this presence for [Robustness Variable] * [Query Interval] +
  37  * [Query Response Interval].  However, OLD_AGE_THRESHOLD is in units of
  38  * [Query Interval], so doesn't have sufficient resolution to represent
  39  * [Query Response Interval].  When the timer mechanism gets an efficient
  40  * method of refreshing timers, this should get fixed.
  41  */
  42 #define OLD_AGE_THRESHOLD               IGMP_ROBUSTNESS_VARIABLE