FreeBSD/Linux Kernel Cross Reference
sys/netinet6/mld6_var.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_var.h 201747 2010-01-07 14:15:34Z bms $
     */
    #ifndef _NETINET6_MLD6_VAR_H_
    #define _NETINET6_MLD6_VAR_H_
    
    /*
     * Multicast Listener Discovery (MLD)
     * implementation-specific definitions.
     */
    
    #ifdef _KERNEL
    
    /*
     * Per-link MLD state.
     */
    struct mld_ifinfo {
            LIST_ENTRY(mld_ifinfo) mli_link;
            struct ifnet *mli_ifp;  /* interface this instance belongs to */
            uint32_t mli_version;   /* MLDv1 Host Compatibility Mode */
            uint32_t mli_v1_timer;  /* MLDv1 Querier Present timer (s) */
            uint32_t mli_v2_timer;  /* MLDv2 General Query (interface) timer (s)*/
            uint32_t mli_flags;     /* MLD per-interface flags */
            uint32_t mli_rv;        /* MLDv2 Robustness Variable */
            uint32_t mli_qi;        /* MLDv2 Query Interval (s) */
            uint32_t mli_qri;       /* MLDv2 Query Response Interval (s) */
            uint32_t mli_uri;       /* MLDv2 Unsolicited Report Interval (s) */
            SLIST_HEAD(,in6_multi)  mli_relinmhead; /* released groups */
            struct ifqueue   mli_gq;        /* queue of general query responses */
    };
    #define MLIF_SILENT     0x00000001      /* Do not use MLD on this ifp */
    #define MLIF_USEALLOW   0x00000002      /* Use ALLOW/BLOCK for joins/leaves */
    
    #define MLD_RANDOM_DELAY(X)             (arc4random() % (X) + 1)
    #define MLD_MAX_STATE_CHANGES           24 /* Max pending changes per group */
    
    /*
     * MLD per-group states.
     */
    #define MLD_NOT_MEMBER                  0 /* Can garbage collect group */
    #define MLD_SILENT_MEMBER               1 /* Do not perform MLD for group */
    #define MLD_REPORTING_MEMBER            2 /* MLDv1 we are reporter */
    #define MLD_IDLE_MEMBER                 3 /* MLDv1 we reported last */
    #define MLD_LAZY_MEMBER                 4 /* MLDv1 other member reporting */
    #define MLD_SLEEPING_MEMBER             5 /* MLDv1 start query response */
    #define MLD_AWAKENING_MEMBER            6 /* MLDv1 group timer will start */
    #define MLD_G_QUERY_PENDING_MEMBER      7 /* MLDv2 group query pending */
    #define MLD_SG_QUERY_PENDING_MEMBER     8 /* MLDv2 source query pending */
    #define MLD_LEAVING_MEMBER              9 /* MLDv2 dying gasp (pending last */
                                              /* retransmission of INCLUDE {}) */
    
    /*
     * MLD version tag.
     */
    #define MLD_VERSION_NONE                0 /* Invalid */
    #define MLD_VERSION_1                   1
    #define MLD_VERSION_2                   2 /* Default */
    
    /*
     * MLDv2 protocol control variables.
     */
    #define MLD_RV_INIT             2       /* Robustness Variable */
    #define MLD_RV_MIN              1
    #define MLD_RV_MAX              7
    
    #define MLD_QI_INIT             125     /* Query Interval (s) */
    #define MLD_QI_MIN              1
    #define MLD_QI_MAX              255
    
    #define MLD_QRI_INIT            10      /* Query Response Interval (s) */
    #define MLD_QRI_MIN             1
    #define MLD_QRI_MAX             255
    
   #define MLD_URI_INIT            3       /* Unsolicited Report Interval (s) */
   #define MLD_URI_MIN             0
   #define MLD_URI_MAX             10
   
   #define MLD_MAX_GS_SOURCES              256 /* # of sources in rx GS query */
   #define MLD_MAX_G_GS_PACKETS            8 /* # of packets to answer G/GS */
   #define MLD_MAX_STATE_CHANGE_PACKETS    8 /* # of packets per state change */
   #define MLD_MAX_RESPONSE_PACKETS        16 /* # of packets for general query */
   #define MLD_MAX_RESPONSE_BURST          4 /* # of responses to send at once */
   #define MLD_RESPONSE_BURST_INTERVAL     (PR_FASTHZ / 2) /* 500ms */
   
   /*
    * MLD-specific mbuf flags.
    */
   #define M_MLDV1         M_PROTO1        /* Packet is MLDv1 */
   #define M_GROUPREC      M_PROTO3        /* mbuf chain is a group record */
   
   /*
    * Leading space for MLDv2 reports inside MTU.
    *
    * NOTE: This differs from IGMPv3 significantly. KAME IPv6 requires
    * that a fully formed mbuf chain *without* the Router Alert option
    * is passed to ip6_output(), however we must account for it in the
    * MTU if we need to split an MLDv2 report into several packets.
    *
    * We now put the MLDv2 report header in the initial mbuf containing
    * the IPv6 header.
    */
   #define MLD_MTUSPACE    (sizeof(struct ip6_hdr) + sizeof(struct mld_raopt) + \
                            sizeof(struct icmp6_hdr))
   
   /*
    * Subsystem lock macros.
    * The MLD lock is only taken with MLD. Currently it is system-wide.
    * VIMAGE: The lock could be pushed to per-VIMAGE granularity in future.
    */
   #define MLD_LOCK_INIT() mtx_init(&mld_mtx, "mld_mtx", NULL, MTX_DEF)
   #define MLD_LOCK_DESTROY()      mtx_destroy(&mld_mtx)
   #define MLD_LOCK()              mtx_lock(&mld_mtx)
   #define MLD_LOCK_ASSERT()       mtx_assert(&mld_mtx, MA_OWNED)
   #define MLD_UNLOCK()            mtx_unlock(&mld_mtx)
   #define MLD_UNLOCK_ASSERT()     mtx_assert(&mld_mtx, MA_NOTOWNED)
   
   /*
    * Per-link MLD context.
    */
   #define MLD_IFINFO(ifp) \
           (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->mld_ifinfo)
   
   int     mld_change_state(struct in6_multi *, const int);
   struct mld_ifinfo *
           mld_domifattach(struct ifnet *);
   void    mld_domifdetach(struct ifnet *);
   void    mld_fasttimo(void);
   void    mld_ifdetach(struct ifnet *);
   int     mld_input(struct mbuf *, int, int);
   void    mld_slowtimo(void);
   
   #ifdef SYSCTL_DECL
   SYSCTL_DECL(_net_inet6_mld);
   #endif
   
   #endif /* _KERNEL */
   
   #endif /* _NETINET6_MLD6_VAR_H_ */

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