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: releng/8.2/sys/netinet/igmp_var.h 199583 2009-11-20 15:27:52Z jhb $
   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 #ifndef BURN_BRIDGES
   50 /*
   51  * Pre-IGMPV3 igmpstat structure.
   52  */
   53 struct oigmpstat {
   54         u_int igps_rcv_total;           /* total IGMP messages received */
   55         u_int igps_rcv_tooshort;        /* received with too few bytes */
   56         u_int igps_rcv_badsum;          /* received with bad checksum */
   57         u_int igps_rcv_queries;         /* received membership queries */
   58         u_int igps_rcv_badqueries;      /* received invalid queries */
   59         u_int igps_rcv_reports;         /* received membership reports */
   60         u_int igps_rcv_badreports;      /* received invalid reports */
   61         u_int igps_rcv_ourreports;      /* received reports for our groups */
   62         u_int igps_snd_reports;         /* sent membership reports */
   63         u_int igps_rcv_toolong;         /* received with too many bytes */
   64 };
   65 #endif
   66 
   67 /*
   68  * IGMPv3 protocol statistics.
   69  */
   70 struct igmpstat {
   71         /*
   72          * Structure header (to insulate ABI changes).
   73          */
   74         uint32_t igps_version;          /* version of this structure */
   75         uint32_t igps_len;              /* length of this structure */
   76         /*
   77          * Message statistics.
   78          */
   79         uint64_t igps_rcv_total;        /* total IGMP messages received */
   80         uint64_t igps_rcv_tooshort;     /* received with too few bytes */
   81         uint64_t igps_rcv_badttl;       /* received with ttl other than 1 */
   82         uint64_t igps_rcv_badsum;       /* received with bad checksum */
   83         /*
   84          * Query statistics.
   85          */
   86         uint64_t igps_rcv_v1v2_queries; /* received IGMPv1/IGMPv2 queries */
   87         uint64_t igps_rcv_v3_queries;   /* received IGMPv3 queries */
   88         uint64_t igps_rcv_badqueries;   /* received invalid queries */
   89         uint64_t igps_rcv_gen_queries;  /* received general queries */
   90         uint64_t igps_rcv_group_queries;/* received group queries */
   91         uint64_t igps_rcv_gsr_queries;  /* received group-source queries */
   92         uint64_t igps_drop_gsr_queries; /* dropped group-source queries */
   93         /*
   94          * Report statistics.
   95          */
   96         uint64_t igps_rcv_reports;      /* received membership reports */
   97         uint64_t igps_rcv_badreports;   /* received invalid reports */
   98         uint64_t igps_rcv_ourreports;   /* received reports for our groups */
   99         uint64_t igps_rcv_nora;         /* received w/o Router Alert option */
  100         uint64_t igps_snd_reports;      /* sent membership reports */
  101         /*
  102          * Padding for future additions.
  103          */
  104         uint64_t __igps_pad[4];
  105 };
  106 #define IGPS_VERSION_3  3               /* as of FreeBSD 8.x */
  107 #define IGPS_VERSION3_LEN               168
  108 
  109 #ifdef _KERNEL
  110 #define IGMPSTAT_ADD(name, val)         V_igmpstat.name += (val)
  111 #define IGMPSTAT_INC(name)              IGMPSTAT_ADD(name, 1)
  112 #endif
  113 
  114 #ifdef CTASSERT
  115 CTASSERT(sizeof(struct igmpstat) == 168);
  116 #endif
  117 
  118 #ifdef _KERNEL
  119 #define IGMP_RANDOM_DELAY(X) (random() % (X) + 1)
  120 
  121 #define IGMP_MAX_STATE_CHANGES          24 /* Max pending changes per group */
  122 
  123 /*
  124  * IGMP per-group states.
  125  */
  126 #define IGMP_NOT_MEMBER                 0 /* Can garbage collect in_multi */
  127 #define IGMP_SILENT_MEMBER              1 /* Do not perform IGMP for group */
  128 #define IGMP_REPORTING_MEMBER           2 /* IGMPv1/2/3 we are reporter */
  129 #define IGMP_IDLE_MEMBER                3 /* IGMPv1/2 we reported last */
  130 #define IGMP_LAZY_MEMBER                4 /* IGMPv1/2 other member reporting */
  131 #define IGMP_SLEEPING_MEMBER            5 /* IGMPv1/2 start query response */
  132 #define IGMP_AWAKENING_MEMBER           6 /* IGMPv1/2 group timer will start */
  133 #define IGMP_G_QUERY_PENDING_MEMBER     7 /* IGMPv3 group query pending */
  134 #define IGMP_SG_QUERY_PENDING_MEMBER    8 /* IGMPv3 source query pending */
  135 #define IGMP_LEAVING_MEMBER             9 /* IGMPv3 dying gasp (pending last */
  136                                           /* retransmission of INCLUDE {}) */
  137 
  138 /*
  139  * IGMP version tag.
  140  */
  141 #define IGMP_VERSION_NONE               0 /* Invalid */
  142 #define IGMP_VERSION_1                  1
  143 #define IGMP_VERSION_2                  2
  144 #define IGMP_VERSION_3                  3 /* Default */
  145 
  146 /*
  147  * IGMPv3 protocol control variables.
  148  */
  149 #define IGMP_RV_INIT            2       /* Robustness Variable */
  150 #define IGMP_RV_MIN             1
  151 #define IGMP_RV_MAX             7
  152 
  153 #define IGMP_QI_INIT            125     /* Query Interval (s) */
  154 #define IGMP_QI_MIN             1
  155 #define IGMP_QI_MAX             255
  156 
  157 #define IGMP_QRI_INIT           10      /* Query Response Interval (s) */
  158 #define IGMP_QRI_MIN            1
  159 #define IGMP_QRI_MAX            255
  160 
  161 #define IGMP_URI_INIT           3       /* Unsolicited Report Interval (s) */
  162 #define IGMP_URI_MIN            0
  163 #define IGMP_URI_MAX            10
  164 
  165 #define IGMP_MAX_G_GS_PACKETS           8 /* # of packets to answer G/GS */
  166 #define IGMP_MAX_STATE_CHANGE_PACKETS   8 /* # of packets per state change */
  167 #define IGMP_MAX_RESPONSE_PACKETS       16 /* # of packets for general query */
  168 #define IGMP_MAX_RESPONSE_BURST         4 /* # of responses to send at once */
  169 #define IGMP_RESPONSE_BURST_INTERVAL    (PR_FASTHZ / 2) /* 500ms */
  170 
  171 /*
  172  * IGMP-specific mbuf flags.
  173  */
  174 #define M_IGMPV2        M_PROTO1        /* Packet is IGMPv2 */
  175 #define M_IGMPV3_HDR    M_PROTO2        /* Packet has IGMPv3 headers */
  176 #define M_GROUPREC      M_PROTO3        /* mbuf chain is a group record */
  177 #define M_IGMP_LOOP     M_PROTO4        /* transmit on loif, not real ifp */
  178 
  179 /*
  180  * Default amount of leading space for IGMPv3 to allocate at the
  181  * beginning of its mbuf packet chains, to avoid fragmentation and
  182  * unnecessary allocation of leading mbufs.
  183  */
  184 #define RAOPT_LEN       4               /* Length of IP Router Alert option */
  185 #define IGMP_LEADINGSPACE               \
  186         (sizeof(struct ip) + RAOPT_LEN + sizeof(struct igmp_report))
  187 
  188 /*
  189  * Subsystem lock macros.
  190  * The IGMP lock is only taken with IGMP. Currently it is system-wide.
  191  * VIMAGE: The lock could be pushed to per-VIMAGE granularity in future.
  192  */
  193 #define IGMP_LOCK_INIT()        mtx_init(&igmp_mtx, "igmp_mtx", NULL, MTX_DEF)
  194 #define IGMP_LOCK_DESTROY()     mtx_destroy(&igmp_mtx)
  195 #define IGMP_LOCK()             mtx_lock(&igmp_mtx)
  196 #define IGMP_LOCK_ASSERT()      mtx_assert(&igmp_mtx, MA_OWNED)
  197 #define IGMP_UNLOCK()           mtx_unlock(&igmp_mtx)
  198 #define IGMP_UNLOCK_ASSERT()    mtx_assert(&igmp_mtx, MA_NOTOWNED)
  199 
  200 struct igmp_ifinfo;
  201 
  202 int     igmp_change_state(struct in_multi *);
  203 void    igmp_fasttimo(void);
  204 struct igmp_ifinfo *
  205         igmp_domifattach(struct ifnet *);
  206 void    igmp_domifdetach(struct ifnet *);
  207 void    igmp_ifdetach(struct ifnet *);
  208 void    igmp_input(struct mbuf *, int);
  209 void    igmp_slowtimo(void);
  210 
  211 SYSCTL_DECL(_net_inet_igmp);
  212 
  213 #endif /* _KERNEL */
  214 
  215 /*
  216  * Names for IGMP sysctl objects
  217  */
  218 #define IGMPCTL_STATS           1       /* statistics (read-only) */
  219 #define IGMPCTL_MAXID           2
  220 
  221 #define IGMPCTL_NAMES { \
  222         { 0, 0 }, \
  223         { "stats", CTLTYPE_STRUCT } \
  224 }
  225 #endif

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