FreeBSD/Linux Kernel Cross Reference
sys/netinet6/mld6.h

     /*-
      * Copyright (c) 2009 Bruce Simpson.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
      * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. The name of the author may not be used to endorse or promote
     *    products derived from this software without specific prior written
     *    permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: releng/8.4/sys/netinet6/mld6.h 191666 2009-04-29 11:31:23Z bms $
     */
    
    #ifndef _NETINET6_MLD6_H_
    #define _NETINET6_MLD6_H_
    
    /*
     * Multicast Listener Discovery (MLD) definitions.
     */
    
    /* Minimum length of any MLD protocol message. */
    #define MLD_MINLEN      sizeof(struct icmp6_hdr)
    
    /*
     * MLD v2 query format.
     * See <netinet/icmp6.h> for struct mld_hdr
     * (MLDv1 query and host report format).
     */
    struct mldv2_query {
            struct icmp6_hdr        mld_icmp6_hdr;  /* ICMPv6 header */
            struct in6_addr         mld_addr;       /* address being queried */
            uint8_t         mld_misc;       /* reserved/suppress/robustness   */
            uint8_t         mld_qqi;        /* querier's query interval       */
            uint16_t        mld_numsrc;     /* number of sources              */
            /* followed by 1..numsrc source addresses */
    } __packed;
    #define MLD_V2_QUERY_MINLEN             sizeof(struct mldv2_query)
    #define MLD_MRC_EXP(x)                  ((ntohs((x)) >> 12) & 0x0007)
    #define MLD_MRC_MANT(x)                 (ntohs((x)) & 0x0fff)
    #define MLD_QQIC_EXP(x)                 (((x) >> 4) & 0x07)
    #define MLD_QQIC_MANT(x)                ((x) & 0x0f)
    #define MLD_QRESV(x)                    (((x) >> 4) & 0x0f)
    #define MLD_SFLAG(x)                    (((x) >> 3) & 0x01)
    #define MLD_QRV(x)                      ((x) & 0x07)
    
    /*
     * MLDv2 host membership report header.
     * mld_type: MLDV2_LISTENER_REPORT
     */
    struct mldv2_report {
            struct icmp6_hdr        mld_icmp6_hdr;
            /* followed by 1..numgrps records */
    } __packed;
    /* overlaid on struct icmp6_hdr. */
    #define mld_numrecs     mld_icmp6_hdr.icmp6_data16[1]
    
    struct mldv2_record {
            uint8_t                 mr_type;        /* record type */
            uint8_t                 mr_datalen;     /* length of auxiliary data */
            uint16_t                mr_numsrc;      /* number of sources */
            struct in6_addr         mr_addr;        /* address being reported */
            /* followed by 1..numsrc source addresses */
    } __packed;
    #define MLD_V2_REPORT_MAXRECS           65535
    
    /*
     * MLDv2 report modes.
     */
    #define MLD_DO_NOTHING                  0       /* don't send a record */
    #define MLD_MODE_IS_INCLUDE             1       /* MODE_IN */
    #define MLD_MODE_IS_EXCLUDE             2       /* MODE_EX */
    #define MLD_CHANGE_TO_INCLUDE_MODE      3       /* TO_IN */
    #define MLD_CHANGE_TO_EXCLUDE_MODE      4       /* TO_EX */
    #define MLD_ALLOW_NEW_SOURCES           5       /* ALLOW_NEW */
    #define MLD_BLOCK_OLD_SOURCES           6       /* BLOCK_OLD */
    
    /*
     * MLDv2 query types.
     */
    #define MLD_V2_GENERAL_QUERY            1
    #define MLD_V2_GROUP_QUERY              2
    #define MLD_V2_GROUP_SOURCE_QUERY       3
   
   /*
    * Maximum report interval for MLDv1 host membership reports.
    */
   #define MLD_V1_MAX_RI                   10
   
   /*
    * MLD_TIMER_SCALE denotes that the MLD code field specifies
    * time in milliseconds.
    */
   #define MLD_TIMER_SCALE                 1000
   
   #endif /* _NETINET6_MLD6_H_ */

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