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_var.h

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    1 /*-
    2  * Copyright (c) 2009 Bruce Simpson.
    3  *
    4  * Redistribution and use in source and binary forms, with or without
    5  * modification, are permitted provided that the following conditions
    6  * are met:
    7  * 1. Redistributions of source code must retain the above copyright
    8  *    notice, this list of conditions and the following disclaimer.
    9  * 2. Redistributions in binary form must reproduce the above copyright
   10  *    notice, this list of conditions and the following disclaimer in the
   11  *    documentation and/or other materials provided with the distribution.
   12  * 3. The name of the author may not be used to endorse or promote
   13  *    products derived from this software without specific prior written
   14  *    permission.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  *
   28  * $FreeBSD: releng/11.2/sys/netinet6/mld6_var.h 279027 2015-02-19 22:37:01Z glebius $
   29  */
   30 #ifndef _NETINET6_MLD6_VAR_H_
   31 #define _NETINET6_MLD6_VAR_H_
   32 
   33 /*
   34  * Multicast Listener Discovery (MLD)
   35  * implementation-specific definitions.
   36  */
   37 
   38 /*
   39  * MLD per-group states.
   40  */
   41 #define MLD_NOT_MEMBER                  0 /* Can garbage collect group */
   42 #define MLD_SILENT_MEMBER               1 /* Do not perform MLD for group */
   43 #define MLD_REPORTING_MEMBER            2 /* MLDv1 we are reporter */
   44 #define MLD_IDLE_MEMBER                 3 /* MLDv1 we reported last */
   45 #define MLD_LAZY_MEMBER                 4 /* MLDv1 other member reporting */
   46 #define MLD_SLEEPING_MEMBER             5 /* MLDv1 start query response */
   47 #define MLD_AWAKENING_MEMBER            6 /* MLDv1 group timer will start */
   48 #define MLD_G_QUERY_PENDING_MEMBER      7 /* MLDv2 group query pending */
   49 #define MLD_SG_QUERY_PENDING_MEMBER     8 /* MLDv2 source query pending */
   50 #define MLD_LEAVING_MEMBER              9 /* MLDv2 dying gasp (pending last */
   51                                           /* retransmission of INCLUDE {}) */
   52 
   53 /*
   54  * MLD version tag.
   55  */
   56 #define MLD_VERSION_NONE                0 /* Invalid */
   57 #define MLD_VERSION_1                   1
   58 #define MLD_VERSION_2                   2 /* Default */
   59 
   60 /*
   61  * MLDv2 protocol control variables.
   62  */
   63 #define MLD_RV_INIT             2       /* Robustness Variable */
   64 #define MLD_RV_MIN              1
   65 #define MLD_RV_MAX              7
   66 
   67 #define MLD_QI_INIT             125     /* Query Interval (s) */
   68 #define MLD_QI_MIN              1
   69 #define MLD_QI_MAX              255
   70 
   71 #define MLD_QRI_INIT            10      /* Query Response Interval (s) */
   72 #define MLD_QRI_MIN             1
   73 #define MLD_QRI_MAX             255
   74 
   75 #define MLD_URI_INIT            3       /* Unsolicited Report Interval (s) */
   76 #define MLD_URI_MIN             0
   77 #define MLD_URI_MAX             10
   78 
   79 #define MLD_MAX_GS_SOURCES              256 /* # of sources in rx GS query */
   80 #define MLD_MAX_G_GS_PACKETS            8 /* # of packets to answer G/GS */
   81 #define MLD_MAX_STATE_CHANGE_PACKETS    8 /* # of packets per state change */
   82 #define MLD_MAX_RESPONSE_PACKETS        16 /* # of packets for general query */
   83 #define MLD_MAX_RESPONSE_BURST          4 /* # of responses to send at once */
   84 #define MLD_RESPONSE_BURST_INTERVAL     (PR_FASTHZ / 2) /* 500ms */
   85 
   86 /*
   87  * MLD-specific mbuf flags.
   88  */
   89 #define M_MLDV1         M_PROTO1        /* Packet is MLDv1 */
   90 #define M_GROUPREC      M_PROTO3        /* mbuf chain is a group record */
   91 
   92 /*
   93  * Leading space for MLDv2 reports inside MTU.
   94  *
   95  * NOTE: This differs from IGMPv3 significantly. KAME IPv6 requires
   96  * that a fully formed mbuf chain *without* the Router Alert option
   97  * is passed to ip6_output(), however we must account for it in the
   98  * MTU if we need to split an MLDv2 report into several packets.
   99  *
  100  * We now put the MLDv2 report header in the initial mbuf containing
  101  * the IPv6 header.
  102  */
  103 #define MLD_MTUSPACE    (sizeof(struct ip6_hdr) + sizeof(struct mld_raopt) + \
  104                          sizeof(struct icmp6_hdr))
  105 
  106 /*
  107  * Structure returned by net.inet6.mld.ifinfo.
  108  */
  109 struct mld_ifinfo {
  110         uint32_t mli_version;   /* MLDv1 Host Compatibility Mode */
  111         uint32_t mli_v1_timer;  /* MLDv1 Querier Present timer (s) */
  112         uint32_t mli_v2_timer;  /* MLDv2 General Query (interface) timer (s)*/
  113         uint32_t mli_flags;     /* MLD per-interface flags */
  114 #define MLIF_SILENT     0x00000001      /* Do not use MLD on this ifp */
  115 #define MLIF_USEALLOW   0x00000002      /* Use ALLOW/BLOCK for joins/leaves */
  116         uint32_t mli_rv;        /* MLDv2 Robustness Variable */
  117         uint32_t mli_qi;        /* MLDv2 Query Interval (s) */
  118         uint32_t mli_qri;       /* MLDv2 Query Response Interval (s) */
  119         uint32_t mli_uri;       /* MLDv2 Unsolicited Report Interval (s) */
  120 };
  121 
  122 #ifdef _KERNEL
  123 /*
  124  * Per-link MLD state.
  125  */
  126 struct mld_ifsoftc {
  127         LIST_ENTRY(mld_ifsoftc) mli_link;
  128         struct ifnet *mli_ifp;  /* interface this instance belongs to */
  129         uint32_t mli_version;   /* MLDv1 Host Compatibility Mode */
  130         uint32_t mli_v1_timer;  /* MLDv1 Querier Present timer (s) */
  131         uint32_t mli_v2_timer;  /* MLDv2 General Query (interface) timer (s)*/
  132         uint32_t mli_flags;     /* MLD per-interface flags */
  133         uint32_t mli_rv;        /* MLDv2 Robustness Variable */
  134         uint32_t mli_qi;        /* MLDv2 Query Interval (s) */
  135         uint32_t mli_qri;       /* MLDv2 Query Response Interval (s) */
  136         uint32_t mli_uri;       /* MLDv2 Unsolicited Report Interval (s) */
  137         SLIST_HEAD(,in6_multi)  mli_relinmhead; /* released groups */
  138         struct mbufq     mli_gq;        /* queue of general query responses */
  139 };
  140 
  141 #define MLD_RANDOM_DELAY(X)             (arc4random() % (X) + 1)
  142 #define MLD_MAX_STATE_CHANGES           24 /* Max pending changes per group */
  143 
  144 /*
  145  * Subsystem lock macros.
  146  * The MLD lock is only taken with MLD. Currently it is system-wide.
  147  * VIMAGE: The lock could be pushed to per-VIMAGE granularity in future.
  148  */
  149 #define MLD_LOCK_INIT() mtx_init(&mld_mtx, "mld_mtx", NULL, MTX_DEF)
  150 #define MLD_LOCK_DESTROY()      mtx_destroy(&mld_mtx)
  151 #define MLD_LOCK()              mtx_lock(&mld_mtx)
  152 #define MLD_LOCK_ASSERT()       mtx_assert(&mld_mtx, MA_OWNED)
  153 #define MLD_UNLOCK()            mtx_unlock(&mld_mtx)
  154 #define MLD_UNLOCK_ASSERT()     mtx_assert(&mld_mtx, MA_NOTOWNED)
  155 
  156 /*
  157  * Per-link MLD context.
  158  */
  159 #define MLD_IFINFO(ifp) \
  160         (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->mld_ifinfo)
  161 
  162 int     mld_change_state(struct in6_multi *, const int);
  163 struct mld_ifsoftc *
  164         mld_domifattach(struct ifnet *);
  165 void    mld_domifdetach(struct ifnet *);
  166 void    mld_fasttimo(void);
  167 void    mld_ifdetach(struct ifnet *);
  168 int     mld_input(struct mbuf *, int, int);
  169 void    mld_slowtimo(void);
  170 
  171 #ifdef SYSCTL_DECL
  172 SYSCTL_DECL(_net_inet6_mld);
  173 #endif
  174 
  175 #endif /* _KERNEL */
  176 
  177 #endif /* _NETINET6_MLD6_VAR_H_ */

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