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/netinet6/mld6.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2009 Bruce Simpson.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 3. The name of the author may not be used to endorse or promote
   15  *    products derived from this software without specific prior written
   16  *    permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  * $FreeBSD$
   31  */
   32 
   33 #ifndef _NETINET6_MLD6_H_
   34 #define _NETINET6_MLD6_H_
   35 
   36 /*
   37  * Multicast Listener Discovery (MLD) definitions.
   38  */
   39 
   40 /* Minimum length of any MLD protocol message. */
   41 #define MLD_MINLEN      sizeof(struct icmp6_hdr)
   42 
   43 /*
   44  * MLD v2 query format.
   45  * See <netinet/icmp6.h> for struct mld_hdr
   46  * (MLDv1 query and host report format).
   47  */
   48 struct mldv2_query {
   49         struct icmp6_hdr        mld_icmp6_hdr;  /* ICMPv6 header */
   50         struct in6_addr         mld_addr;       /* address being queried */
   51         uint8_t         mld_misc;       /* reserved/suppress/robustness   */
   52         uint8_t         mld_qqi;        /* querier's query interval       */
   53         uint16_t        mld_numsrc;     /* number of sources              */
   54         /* followed by 1..numsrc source addresses */
   55 } __packed;
   56 #define MLD_V2_QUERY_MINLEN             sizeof(struct mldv2_query)
   57 #define MLD_MRC_EXP(x)                  ((ntohs((x)) >> 12) & 0x0007)
   58 #define MLD_MRC_MANT(x)                 (ntohs((x)) & 0x0fff)
   59 #define MLD_QQIC_EXP(x)                 (((x) >> 4) & 0x07)
   60 #define MLD_QQIC_MANT(x)                ((x) & 0x0f)
   61 #define MLD_QRESV(x)                    (((x) >> 4) & 0x0f)
   62 #define MLD_SFLAG(x)                    (((x) >> 3) & 0x01)
   63 #define MLD_QRV(x)                      ((x) & 0x07)
   64 
   65 /*
   66  * MLDv2 host membership report header.
   67  * mld_type: MLDV2_LISTENER_REPORT
   68  */
   69 struct mldv2_report {
   70         struct icmp6_hdr        mld_icmp6_hdr;
   71         /* followed by 1..numgrps records */
   72 } __packed;
   73 /* overlaid on struct icmp6_hdr. */
   74 #define mld_numrecs     mld_icmp6_hdr.icmp6_data16[1]
   75 
   76 struct mldv2_record {
   77         uint8_t                 mr_type;        /* record type */
   78         uint8_t                 mr_datalen;     /* length of auxiliary data */
   79         uint16_t                mr_numsrc;      /* number of sources */
   80         struct in6_addr         mr_addr;        /* address being reported */
   81         /* followed by 1..numsrc source addresses */
   82 } __packed;
   83 #define MLD_V2_REPORT_MAXRECS           65535
   84 
   85 /*
   86  * MLDv2 report modes.
   87  */
   88 #define MLD_DO_NOTHING                  0       /* don't send a record */
   89 #define MLD_MODE_IS_INCLUDE             1       /* MODE_IN */
   90 #define MLD_MODE_IS_EXCLUDE             2       /* MODE_EX */
   91 #define MLD_CHANGE_TO_INCLUDE_MODE      3       /* TO_IN */
   92 #define MLD_CHANGE_TO_EXCLUDE_MODE      4       /* TO_EX */
   93 #define MLD_ALLOW_NEW_SOURCES           5       /* ALLOW_NEW */
   94 #define MLD_BLOCK_OLD_SOURCES           6       /* BLOCK_OLD */
   95 
   96 /*
   97  * MLDv2 query types.
   98  */
   99 #define MLD_V2_GENERAL_QUERY            1
  100 #define MLD_V2_GROUP_QUERY              2
  101 #define MLD_V2_GROUP_SOURCE_QUERY       3
  102 
  103 /*
  104  * Maximum report interval for MLDv1 host membership reports.
  105  */
  106 #define MLD_V1_MAX_RI                   10
  107 
  108 /*
  109  * MLD_TIMER_SCALE denotes that the MLD code field specifies
  110  * time in milliseconds.
  111  */
  112 #define MLD_TIMER_SCALE                 1000
  113 
  114 #endif /* _NETINET6_MLD6_H_ */

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