FreeBSD/Linux Kernel Cross Reference
sys/netinet/icmp6.h

     /*      $NetBSD: icmp6.h,v 1.59 2022/08/29 09:14:02 knakahara Exp $     */
     /*      $KAME: icmp6.h,v 1.84 2003/04/23 10:26:51 itojun Exp $  */
     
     
     /*
      * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
      * All rights reserved.
      *
      * 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. Neither the name of the project nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
     */
    
    /*
     * Copyright (c) 1982, 1986, 1993
     *      The Regents of the University of California.  All rights reserved.
     *
     * 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. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
     *
     *      @(#)ip_icmp.h   8.1 (Berkeley) 6/10/93
     */
    
    #ifndef _NETINET_ICMP6_H_
    #define _NETINET_ICMP6_H_
    
    #define ICMPV6_PLD_MAXLEN       1232    /* IPV6_MMTU - sizeof(struct ip6_hdr)
                                               - sizeof(struct icmp6_hdr) */
    
    struct icmp6_hdr {
            u_int8_t        icmp6_type;     /* type field */
            u_int8_t        icmp6_code;     /* code field */
            u_int16_t       icmp6_cksum;    /* checksum field */
            union {
                    u_int32_t       icmp6_un_data32[1]; /* type-specific field */
                    u_int16_t       icmp6_un_data16[2]; /* type-specific field */
                    u_int8_t        icmp6_un_data8[4];  /* type-specific field */
            } icmp6_dataun;
    };
    
    #define icmp6_data32    icmp6_dataun.icmp6_un_data32
    #define icmp6_data16    icmp6_dataun.icmp6_un_data16
    #define icmp6_data8     icmp6_dataun.icmp6_un_data8
    #define icmp6_pptr      icmp6_data32[0]         /* parameter prob */
    #define icmp6_mtu       icmp6_data32[0]         /* packet too big */
    #define icmp6_id        icmp6_data16[0]         /* echo request/reply */
    #define icmp6_seq       icmp6_data16[1]         /* echo request/reply */
    #define icmp6_maxdelay  icmp6_data16[0]         /* mcast group membership */
    
    #define ICMP6_DST_UNREACH               1       /* dest unreachable, codes: */
    #define ICMP6_PACKET_TOO_BIG            2       /* packet too big */
    #define ICMP6_TIME_EXCEEDED             3       /* time exceeded, code: */
    #define ICMP6_PARAM_PROB                4       /* ip6 header bad */
    
    #define ICMP6_ECHO_REQUEST              128     /* echo service */
    #define ICMP6_ECHO_REPLY                129     /* echo reply */
    #define MLD_LISTENER_QUERY              130     /* multicast listener query */
    #define MLD_LISTENER_REPORT             131     /* multicast listener report */
   #define MLD_LISTENER_DONE               132     /* multicast listener done */
   #define MLD_LISTENER_REDUCTION MLD_LISTENER_DONE /* RFC3542 definition */
   
   /* RFC2292 decls */
   #define ICMP6_MEMBERSHIP_QUERY          130     /* group membership query */
   #define ICMP6_MEMBERSHIP_REPORT         131     /* group membership report */
   #define ICMP6_MEMBERSHIP_REDUCTION      132     /* group membership termination */
   
   #ifndef _KERNEL
   /* the followings are for backward compatibility to old KAME apps. */
   #define MLD6_LISTENER_QUERY     MLD_LISTENER_QUERY
   #define MLD6_LISTENER_REPORT    MLD_LISTENER_REPORT
   #define MLD6_LISTENER_DONE      MLD_LISTENER_DONE
   #endif
   
   #define ND_ROUTER_SOLICIT               133     /* router solicitation */
   #define ND_ROUTER_ADVERT                134     /* router advertisement */
   #define ND_NEIGHBOR_SOLICIT             135     /* neighbor solicitation */
   #define ND_NEIGHBOR_ADVERT              136     /* neighbor advertisement */
   #define ND_REDIRECT                     137     /* redirect */
   
   #define ICMP6_ROUTER_RENUMBERING        138     /* router renumbering */
   
   #define ICMP6_WRUREQUEST                139     /* who are you request */
   #define ICMP6_WRUREPLY                  140     /* who are you reply */
   #define ICMP6_FQDN_QUERY                139     /* FQDN query */
   #define ICMP6_FQDN_REPLY                140     /* FQDN reply */
   #define ICMP6_NI_QUERY                  139     /* node information request */
   #define ICMP6_NI_REPLY                  140     /* node information reply */
   #define MLDV2_LISTENER_REPORT           143     /* RFC3810 listener report */
   
   /* The definitions below are experimental. TBA */
   #define MLD_MTRACE_RESP                 200     /* mtrace response(to sender) */
   #define MLD_MTRACE                      201     /* mtrace messages */
   
   #ifndef _KERNEL
   /* the followings are for backward compatibility to old KAME apps. */
   #define MLD6_MTRACE_RESP        MLD_MTRACE_RESP
   #define MLD6_MTRACE             MLD_MTRACE
   #endif
   
   #define ICMP6_MAXTYPE                   201
   
   #define ICMP6_DST_UNREACH_NOROUTE       0       /* no route to destination */
   #define ICMP6_DST_UNREACH_ADMIN         1       /* administratively prohibited */
   #define ICMP6_DST_UNREACH_NOTNEIGHBOR   2       /* not a neighbor(obsolete) */
   #define ICMP6_DST_UNREACH_BEYONDSCOPE   2       /* beyond scope of source address */
   #define ICMP6_DST_UNREACH_ADDR          3       /* address unreachable */
   #define ICMP6_DST_UNREACH_NOPORT        4       /* port unreachable */
   #define ICMP6_DST_UNREACH_POLICY        5       /* source address failed ingress/egress policy */
   #define ICMP6_DST_UNREACH_REJROUTE      6       /* reject route to destination */
   #define ICMP6_DST_UNREACH_SOURCERT      7       /* error in source routing header */
   
   #define ICMP6_TIME_EXCEED_TRANSIT       0       /* ttl==0 in transit */
   #define ICMP6_TIME_EXCEED_REASSEMBLY    1       /* ttl==0 in reass */
   
   #define ICMP6_PARAMPROB_HEADER          0       /* erroneous header field */
   #define ICMP6_PARAMPROB_NEXTHEADER      1       /* unrecognized next header */
   #define ICMP6_PARAMPROB_OPTION          2       /* unrecognized option */
   #define ICMP6_PARAMPROB_FRAGMENT        3       /* incomplete chain in frag */
   
   #define ICMP6_INFOMSG_MASK              0x80    /* all informational messages */
   
   #define ICMP6_NI_SUBJ_IPV6      0       /* Query Subject is an IPv6 address */
   #define ICMP6_NI_SUBJ_FQDN      1       /* Query Subject is a Domain name */
   #define ICMP6_NI_SUBJ_IPV4      2       /* Query Subject is an IPv4 address */
   
   #define ICMP6_NI_SUCCESS        0       /* node information successful reply */
   #define ICMP6_NI_REFUSED        1       /* node information request is refused */
   #define ICMP6_NI_UNKNOWN        2       /* unknown Qtype */
   
   #define ICMP6_ROUTER_RENUMBERING_COMMAND  0     /* rr command */
   #define ICMP6_ROUTER_RENUMBERING_RESULT   1     /* rr result */
   #define ICMP6_ROUTER_RENUMBERING_SEQNUM_RESET   255     /* rr seq num reset */
   
   /* Used in kernel only */
   #define ND_REDIRECT_ONLINK      0       /* redirect to an on-link node */
   #define ND_REDIRECT_ROUTER      1       /* redirect to a better router */
   
   /*
    * Multicast Listener Discovery
    */
   struct mld_hdr {
           struct icmp6_hdr        mld_icmp6_hdr;
           struct in6_addr         mld_addr; /* multicast address */
   };
   
   /* definitions to provide backward compatibility to old KAME applications */
   #ifndef _KERNEL
   #define mld6_hdr        mld_hdr
   #define mld6_type       mld_type
   #define mld6_code       mld_code
   #define mld6_cksum      mld_cksum
   #define mld6_maxdelay   mld_maxdelay
   #define mld6_reserved   mld_reserved
   #define mld6_addr       mld_addr
   #endif
   
   /* shortcut macro definitions */
   #define mld_type        mld_icmp6_hdr.icmp6_type
   #define mld_code        mld_icmp6_hdr.icmp6_code
   #define mld_cksum       mld_icmp6_hdr.icmp6_cksum
   #define mld_maxdelay    mld_icmp6_hdr.icmp6_data16[0]
   #define mld_reserved    mld_icmp6_hdr.icmp6_data16[1]
   
   #define MLD_MINLEN                      24
   
   /*
    * Neighbor Discovery
    */
   
   struct nd_router_solicit {      /* router solicitation */
           struct icmp6_hdr        nd_rs_hdr;
           /* could be followed by options */
   };
   
   #define nd_rs_type      nd_rs_hdr.icmp6_type
   #define nd_rs_code      nd_rs_hdr.icmp6_code
   #define nd_rs_cksum     nd_rs_hdr.icmp6_cksum
   #define nd_rs_reserved  nd_rs_hdr.icmp6_data32[0]
   
   struct nd_router_advert {       /* router advertisement */
           struct icmp6_hdr        nd_ra_hdr;
           u_int32_t               nd_ra_reachable;        /* reachable time */
           u_int32_t               nd_ra_retransmit;       /* retransmit timer */
           /* could be followed by options */
   };
   
   #define nd_ra_type              nd_ra_hdr.icmp6_type
   #define nd_ra_code              nd_ra_hdr.icmp6_code
   #define nd_ra_cksum             nd_ra_hdr.icmp6_cksum
   #define nd_ra_curhoplimit       nd_ra_hdr.icmp6_data8[0]
   #define nd_ra_flags_reserved    nd_ra_hdr.icmp6_data8[1]
   #define ND_RA_FLAG_MANAGED      0x80
   #define ND_RA_FLAG_OTHER        0x40
   #define ND_RA_FLAG_HOME_AGENT   0x20
   #define ND_RA_FLAG_PROXY        0x04
   
   /*
    * Router preference values based on RFC4191.
    */
   #define ND_RA_FLAG_RTPREF_MASK  0x18 /* 00011000 */
   
   #define ND_RA_FLAG_RTPREF_HIGH  0x08 /* 00001000 */
   #define ND_RA_FLAG_RTPREF_MEDIUM        0x00 /* 00000000 */
   #define ND_RA_FLAG_RTPREF_LOW   0x18 /* 00011000 */
   #define ND_RA_FLAG_RTPREF_RSV   0x10 /* 00010000 */
   
   #define nd_ra_router_lifetime   nd_ra_hdr.icmp6_data16[1]
   
   struct nd_neighbor_solicit {    /* neighbor solicitation */
           struct icmp6_hdr        nd_ns_hdr;
           struct in6_addr         nd_ns_target;   /*target address */
           /* could be followed by options */
   };
   
   #define nd_ns_type              nd_ns_hdr.icmp6_type
   #define nd_ns_code              nd_ns_hdr.icmp6_code
   #define nd_ns_cksum             nd_ns_hdr.icmp6_cksum
   #define nd_ns_reserved          nd_ns_hdr.icmp6_data32[0]
   
   struct nd_neighbor_advert {     /* neighbor advertisement */
           struct icmp6_hdr        nd_na_hdr;
           struct in6_addr         nd_na_target;   /* target address */
           /* could be followed by options */
   };
   
   #define nd_na_type              nd_na_hdr.icmp6_type
   #define nd_na_code              nd_na_hdr.icmp6_code
   #define nd_na_cksum             nd_na_hdr.icmp6_cksum
   #define nd_na_flags_reserved    nd_na_hdr.icmp6_data32[0]
   #if BYTE_ORDER == BIG_ENDIAN
   #define ND_NA_FLAG_ROUTER               0x80000000
   #define ND_NA_FLAG_SOLICITED            0x40000000
   #define ND_NA_FLAG_OVERRIDE             0x20000000
   #else
   #if BYTE_ORDER == LITTLE_ENDIAN
   #define ND_NA_FLAG_ROUTER               0x80
   #define ND_NA_FLAG_SOLICITED            0x40
   #define ND_NA_FLAG_OVERRIDE             0x20
   #endif
   #endif
   
   struct nd_redirect {            /* redirect */
           struct icmp6_hdr        nd_rd_hdr;
           struct in6_addr         nd_rd_target;   /* target address */
           struct in6_addr         nd_rd_dst;      /* destination address */
           /* could be followed by options */
   };
   
   #define nd_rd_type              nd_rd_hdr.icmp6_type
   #define nd_rd_code              nd_rd_hdr.icmp6_code
   #define nd_rd_cksum             nd_rd_hdr.icmp6_cksum
   #define nd_rd_reserved          nd_rd_hdr.icmp6_data32[0]
   
   struct nd_opt_hdr {             /* Neighbor discovery option header */
           u_int8_t        nd_opt_type;
           u_int8_t        nd_opt_len;
           /* followed by option specific data*/
   };
   
   #define ND_OPT_SOURCE_LINKADDR          1
   #define ND_OPT_TARGET_LINKADDR          2
   #define ND_OPT_PREFIX_INFORMATION       3
   #define ND_OPT_REDIRECTED_HEADER        4
   #define ND_OPT_MTU                      5
   #define ND_OPT_ADVINTERVAL              7
   #define ND_OPT_HOMEAGENT_INFO           8
   #define ND_OPT_SOURCE_ADDRLIST          9
   #define ND_OPT_TARGET_ADDRLIST          10
   #define ND_OPT_NONCE                    14      /* RFC 3971 */
   #define ND_OPT_MAP                      23      /* RFC 5380 */
   #define ND_OPT_ROUTE_INFO               24      /* RFC 4191 */
   #define ND_OPT_RDNSS                    25      /* RFC 6016 */
   #define ND_OPT_DNSSL                    31      /* RFC 6016 */
   #define ND_OPT_MAX                      31
   
   struct nd_opt_route_info {      /* route info */
           u_int8_t        nd_opt_rti_type;
           u_int8_t        nd_opt_rti_len;
           u_int8_t        nd_opt_rti_prefixlen;
           u_int8_t        nd_opt_rti_flags;
           u_int32_t       nd_opt_rti_lifetime;
           /* prefix follows */
   };
   
   struct nd_opt_prefix_info {     /* prefix information */
           u_int8_t        nd_opt_pi_type;
           u_int8_t        nd_opt_pi_len;
           u_int8_t        nd_opt_pi_prefix_len;
           u_int8_t        nd_opt_pi_flags_reserved;
           u_int32_t       nd_opt_pi_valid_time;
           u_int32_t       nd_opt_pi_preferred_time;
           u_int32_t       nd_opt_pi_reserved2;
           struct in6_addr nd_opt_pi_prefix;
   };
   
   #define ND_OPT_PI_FLAG_ONLINK           0x80
   #define ND_OPT_PI_FLAG_AUTO             0x40
   #define ND_OPT_PI_FLAG_ROUTER           0x20
   
   struct nd_opt_rd_hdr {          /* redirected header */
           u_int8_t        nd_opt_rh_type;
           u_int8_t        nd_opt_rh_len;
           u_int16_t       nd_opt_rh_reserved1;
           u_int32_t       nd_opt_rh_reserved2;
           /* followed by IP header and data */
   };
   
   struct nd_opt_mtu {             /* MTU option */
           u_int8_t        nd_opt_mtu_type;
           u_int8_t        nd_opt_mtu_len;
           u_int16_t       nd_opt_mtu_reserved;
           u_int32_t       nd_opt_mtu_mtu;
   };
   
   #define ND_OPT_NONCE_LEN        ((1 * 8) - 2)
   #if ((ND_OPT_NONCE_LEN + 2) % 8) != 0
   #error  "(ND_OPT_NONCE_LEN + 2) must be a multiple of 8."
   #endif
   struct nd_opt_nonce {
           u_int8_t        nd_opt_nonce_type;
           u_int8_t        nd_opt_nonce_len;
           u_int8_t        nd_opt_nonce[ND_OPT_NONCE_LEN];
   };
   
   struct nd_opt_rdnss {           /* RDNSS option RFC 6106 */
           u_int8_t        nd_opt_rdnss_type;
           u_int8_t        nd_opt_rdnss_len;
           u_int16_t       nd_opt_rdnss_reserved;
           u_int32_t       nd_opt_rdnss_lifetime;
           /* followed by list of IP prefixes */
   };
   
   struct nd_opt_dnssl {           /* DNSSL option RFC 6106 */
           u_int8_t        nd_opt_dnssl_type;
           u_int8_t        nd_opt_dnssl_len;
           u_int16_t       nd_opt_dnssl_reserved;
           u_int32_t       nd_opt_dnssl_lifetime;
           /* followed by list of IP prefixes */
   };
   
   /*
    * icmp6 namelookup
    */
   
   struct icmp6_namelookup {
           struct icmp6_hdr        icmp6_nl_hdr;
           u_int8_t        icmp6_nl_nonce[8];
           int32_t         icmp6_nl_ttl;
   #if 0
           u_int8_t        icmp6_nl_len;
           u_int8_t        icmp6_nl_name[3];
   #endif
           /* could be followed by options */
   };
   
   /*
    * icmp6 node information
    */
   struct icmp6_nodeinfo {
           struct icmp6_hdr icmp6_ni_hdr;
           u_int8_t icmp6_ni_nonce[8];
           /* could be followed by reply data */
   };
   
   #define ni_type         icmp6_ni_hdr.icmp6_type
   #define ni_code         icmp6_ni_hdr.icmp6_code
   #define ni_cksum        icmp6_ni_hdr.icmp6_cksum
   #define ni_qtype        icmp6_ni_hdr.icmp6_data16[0]
   #define ni_flags        icmp6_ni_hdr.icmp6_data16[1]
   
   #define NI_QTYPE_NOOP           0 /* NOOP  */
   #define NI_QTYPE_SUPTYPES       1 /* Supported Qtypes */
   #define NI_QTYPE_FQDN           2 /* FQDN (draft 04) */
   #define NI_QTYPE_DNSNAME        2 /* DNS Name */
   #define NI_QTYPE_NODEADDR       3 /* Node Addresses */
   #define NI_QTYPE_IPV4ADDR       4 /* IPv4 Addresses */
   
   #if BYTE_ORDER == BIG_ENDIAN
   #define NI_SUPTYPE_FLAG_COMPRESS        0x1
   #define NI_FQDN_FLAG_VALIDTTL           0x1
   #elif BYTE_ORDER == LITTLE_ENDIAN
   #define NI_SUPTYPE_FLAG_COMPRESS        0x0100
   #define NI_FQDN_FLAG_VALIDTTL           0x0100
   #endif
   
   #ifdef NAME_LOOKUPS_04
   #if BYTE_ORDER == BIG_ENDIAN
   #define NI_NODEADDR_FLAG_LINKLOCAL      0x1
   #define NI_NODEADDR_FLAG_SITELOCAL      0x2
   #define NI_NODEADDR_FLAG_GLOBAL         0x4
   #define NI_NODEADDR_FLAG_ALL            0x8
   #define NI_NODEADDR_FLAG_TRUNCATE       0x10
   #define NI_NODEADDR_FLAG_ANYCAST        0x20 /* just experimental. not in spec */
   #elif BYTE_ORDER == LITTLE_ENDIAN
   #define NI_NODEADDR_FLAG_LINKLOCAL      0x0100
   #define NI_NODEADDR_FLAG_SITELOCAL      0x0200
   #define NI_NODEADDR_FLAG_GLOBAL         0x0400
   #define NI_NODEADDR_FLAG_ALL            0x0800
   #define NI_NODEADDR_FLAG_TRUNCATE       0x1000
   #define NI_NODEADDR_FLAG_ANYCAST        0x2000 /* just experimental. not in spec */
   #endif
   #else  /* draft-ietf-ipngwg-icmp-name-lookups-05 (and later?) */
   #if BYTE_ORDER == BIG_ENDIAN
   #define NI_NODEADDR_FLAG_TRUNCATE       0x1
   #define NI_NODEADDR_FLAG_ALL            0x2
   #define NI_NODEADDR_FLAG_COMPAT         0x4
   #define NI_NODEADDR_FLAG_LINKLOCAL      0x8
   #define NI_NODEADDR_FLAG_SITELOCAL      0x10
   #define NI_NODEADDR_FLAG_GLOBAL         0x20
   #define NI_NODEADDR_FLAG_ANYCAST        0x40 /* just experimental. not in spec */
   #elif BYTE_ORDER == LITTLE_ENDIAN
   #define NI_NODEADDR_FLAG_TRUNCATE       0x0100
   #define NI_NODEADDR_FLAG_ALL            0x0200
   #define NI_NODEADDR_FLAG_COMPAT         0x0400
   #define NI_NODEADDR_FLAG_LINKLOCAL      0x0800
   #define NI_NODEADDR_FLAG_SITELOCAL      0x1000
   #define NI_NODEADDR_FLAG_GLOBAL         0x2000
   #define NI_NODEADDR_FLAG_ANYCAST        0x4000 /* just experimental. not in spec */
   #endif
   #endif
   
   struct ni_reply_fqdn {
           u_int32_t ni_fqdn_ttl;  /* TTL */
           u_int8_t ni_fqdn_namelen; /* length in octets of the FQDN */
           u_int8_t ni_fqdn_name[3]; /* XXX: alignment */
   };
   
   /*
    * Router Renumbering. as router-renum-08.txt
    */
   struct icmp6_router_renum {     /* router renumbering header */
           struct icmp6_hdr        rr_hdr;
           u_int8_t        rr_segnum;
           u_int8_t        rr_flags;
           u_int16_t       rr_maxdelay;
           u_int32_t       rr_reserved;
   };
   
   #define ICMP6_RR_FLAGS_TEST             0x80
   #define ICMP6_RR_FLAGS_REQRESULT        0x40
   #define ICMP6_RR_FLAGS_FORCEAPPLY       0x20
   #define ICMP6_RR_FLAGS_SPECSITE         0x10
   #define ICMP6_RR_FLAGS_PREVDONE         0x08
   
   #define rr_type         rr_hdr.icmp6_type
   #define rr_code         rr_hdr.icmp6_code
   #define rr_cksum        rr_hdr.icmp6_cksum
   #define rr_seqnum       rr_hdr.icmp6_data32[0]
   
   struct rr_pco_match {           /* match prefix part */
           u_int8_t        rpm_code;
           u_int8_t        rpm_len;
           u_int8_t        rpm_ordinal;
           u_int8_t        rpm_matchlen;
           u_int8_t        rpm_minlen;
           u_int8_t        rpm_maxlen;
           u_int16_t       rpm_reserved;
           struct  in6_addr        rpm_prefix;
   };
   
   #define RPM_PCO_ADD             1
   #define RPM_PCO_CHANGE          2
   #define RPM_PCO_SETGLOBAL       3
   #define RPM_PCO_MAX             4
   
   struct rr_pco_use {             /* use prefix part */
           u_int8_t        rpu_uselen;
           u_int8_t        rpu_keeplen;
           u_int8_t        rpu_ramask;
           u_int8_t        rpu_raflags;
           u_int32_t       rpu_vltime;
           u_int32_t       rpu_pltime;
           u_int32_t       rpu_flags;
           struct  in6_addr rpu_prefix;
   };
   #define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK  0x80
   #define ICMP6_RR_PCOUSE_RAFLAGS_AUTO    0x40
   
   #if BYTE_ORDER == BIG_ENDIAN
   #define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     0x80000000
   #define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     0x40000000
   #elif BYTE_ORDER == LITTLE_ENDIAN
   #define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     0x80
   #define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     0x40
   #endif
   
   struct rr_result {              /* router renumbering result message */
           u_int16_t       rrr_flags;
           u_int8_t        rrr_ordinal;
           u_int8_t        rrr_matchedlen;
           u_int32_t       rrr_ifid;
           struct  in6_addr rrr_prefix;
   };
   #if BYTE_ORDER == BIG_ENDIAN
   #define ICMP6_RR_RESULT_FLAGS_OOB               0x0002
   #define ICMP6_RR_RESULT_FLAGS_FORBIDDEN         0x0001
   #elif BYTE_ORDER == LITTLE_ENDIAN
   #define ICMP6_RR_RESULT_FLAGS_OOB               0x0200
   #define ICMP6_RR_RESULT_FLAGS_FORBIDDEN         0x0100
   #endif
   
   /*
    * icmp6 filter structures.
    */
   
   struct icmp6_filter {
           u_int32_t icmp6_filt[8];
   };
   
   #define ICMP6_FILTER_SETPASSALL(filterp) \
           (void)memset(filterp, 0xff, sizeof(struct icmp6_filter))
   #define ICMP6_FILTER_SETBLOCKALL(filterp) \
           (void)memset(filterp, 0x00, sizeof(struct icmp6_filter))
   #define ICMP6_FILTER_SETPASS(type, filterp) \
           (((filterp)->icmp6_filt[(type) >> 5]) |= (1 << ((type) & 31)))
   #define ICMP6_FILTER_SETBLOCK(type, filterp) \
           (((filterp)->icmp6_filt[(type) >> 5]) &= ~(1 << ((type) & 31)))
   #define ICMP6_FILTER_WILLPASS(type, filterp) \
           ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) != 0)
   #define ICMP6_FILTER_WILLBLOCK(type, filterp) \
           ((((filterp)->icmp6_filt[(type) >> 5]) & (1 << ((type) & 31))) == 0)
   
   /*
    * Variables related to this implementation
    * of the internet control message protocol version 6.
    */
   
   /*
    * IPv6 ICMP statistics.
    * Each counter is an unsigned 64-bit value.
    */
   #define ICMP6_STAT_ERROR        0       /* # of calls to icmp6_error */
   #define ICMP6_STAT_CANTERROR    1       /* no error (old was icmp) */
   #define ICMP6_STAT_TOOFREQ      2       /* no error (rate limitation) */
   #define ICMP6_STAT_OUTHIST      3       /* # of output messages */
                   /* space for 256 counters */
   #define ICMP6_STAT_BADCODE      259     /* icmp6_code out of range */
   #define ICMP6_STAT_TOOSHORT     260     /* packet < sizeof(struct icmp6_hdr) */
   #define ICMP6_STAT_CHECKSUM     261     /* bad checksum */
   #define ICMP6_STAT_BADLEN       262     /* calculated bound mismatch */
           /*
            * number of responses; this member is inherited from the netinet code,
            * but for netinet6 code, it is already available in outhist[].
            */
   #define ICMP6_STAT_REFLECT      263
   #define ICMP6_STAT_INHIST       264     /* # of input messages */
                   /* space for 256 counters */
   #define ICMP6_STAT_ND_TOOMANYOPT 520    /* too many ND options */
   #define ICMP6_STAT_OUTERRHIST   521
                   /* space for 13 counters */
   #define ICMP6_STAT_PMTUCHG      534     /* path MTU changes */
   #define ICMP6_STAT_ND_BADOPT    535     /* bad ND options */
   #define ICMP6_STAT_BADNS        536     /* bad neighbor solicititation */
   #define ICMP6_STAT_BADNA        537     /* bad neighbor advertisement */
   #define ICMP6_STAT_BADRS        538     /* bad router solicitiation */
   #define ICMP6_STAT_BADRA        539     /* bad router advertisement */
   #define ICMP6_STAT_BADREDIRECT  540     /* bad redirect message */
   #define ICMP6_STAT_DROPPED_RAROUTE 541  /* discarded routes from router advertisement */
   
   #define ICMP6_NSTATS            542
   
   #define ICMP6_ERRSTAT_DST_UNREACH_NOROUTE       0
   #define ICMP6_ERRSTAT_DST_UNREACH_ADMIN         1
   #define ICMP6_ERRSTAT_DST_UNREACH_BEYONDSCOPE   2
   #define ICMP6_ERRSTAT_DST_UNREACH_ADDR          3
   #define ICMP6_ERRSTAT_DST_UNREACH_NOPORT        4
   #define ICMP6_ERRSTAT_PACKET_TOO_BIG            5
   #define ICMP6_ERRSTAT_TIME_EXCEED_TRANSIT       6
   #define ICMP6_ERRSTAT_TIME_EXCEED_REASSEMBLY    7
   #define ICMP6_ERRSTAT_PARAMPROB_HEADER          8
   #define ICMP6_ERRSTAT_PARAMPROB_NEXTHEADER      9
   #define ICMP6_ERRSTAT_PARAMPROB_OPTION          10
   #define ICMP6_ERRSTAT_REDIRECT                  11
   #define ICMP6_ERRSTAT_UNKNOWN                   12
   
   /*
    * Names for ICMP sysctl objects
    */
   #define ICMPV6CTL_STATS         1
   #define ICMPV6CTL_REDIRACCEPT   2       /* accept/process redirects */
   #define ICMPV6CTL_REDIRTIMEOUT  3       /* redirect cache time */
   #if 0   /*obsoleted*/
   #define ICMPV6CTL_ERRRATELIMIT  5       /* ICMPv6 error rate limitation */
   #endif
   #define ICMPV6CTL_ND6_PRUNE     6
   #define ICMPV6CTL_ND6_DELAY     8
   #define ICMPV6CTL_ND6_UMAXTRIES 9
   #define ICMPV6CTL_ND6_MMAXTRIES         10
   #define ICMPV6CTL_ND6_USELOOPBACK       11
   /*#define ICMPV6CTL_ND6_PROXYALL        12      obsoleted, do not reuse here */
   #define ICMPV6CTL_NODEINFO      13
   #define ICMPV6CTL_ERRPPSLIMIT   14      /* ICMPv6 error pps limitation */
   #define ICMPV6CTL_ND6_MAXNUDHINT        15
   #define ICMPV6CTL_MTUDISC_HIWAT 16
   #define ICMPV6CTL_MTUDISC_LOWAT 17
   #define ICMPV6CTL_ND6_DEBUG     18
   #ifdef _KERNEL
   #define OICMPV6CTL_ND6_DRLIST   19
   #define OICMPV6CTL_ND6_PRLIST   20
   #endif
   #define ICMPV6CTL_ND6_MAXQLEN   24
   #define ICMPV6CTL_REFLECT_PMTU  25
   #define ICMPV6CTL_DYNAMIC_RT_MSG        26
   
   #ifdef _KERNEL
   struct  rtentry;
   
   void    icmp6_init(void);
   void    icmp6_paramerror(struct mbuf *, int);
   void    icmp6_error(struct mbuf *, int, int, int);
   void    icmp6_error2(struct mbuf *, int, int, int, struct ifnet *,
               struct in6_addr *);
   int     icmp6_input(struct mbuf **, int *, int);
   void    icmp6_fasttimo(void);
   void    icmp6_prepare(struct mbuf *);
   void    icmp6_redirect_output(struct mbuf *, struct rtentry *);
   int     icmp6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
   
   void    icmp6_statinc(u_int);
   
   struct  ip6ctlparam;
   void    icmp6_mtudisc_update(struct ip6ctlparam *, int);
   void    icmp6_mtudisc_callback_register(void (*)(struct in6_addr *));
   
   /* XXX: is this the right place for these macros? */
   #define icmp6_ifstat_inc(ifp, tag) \
   do {                                                            \
           if (ifp)                                                \
                   ((struct in6_ifextra *)((ifp)->if_afdata[AF_INET6]))->icmp6_ifstat->tag++; \
   } while (/*CONSTCOND*/ 0)
   
   #define icmp6_ifoutstat_inc(ifp, type, code) \
   do { \
                   icmp6_ifstat_inc(ifp, ifs6_out_msg); \
                   switch(type) { \
                    case ICMP6_DST_UNREACH: \
                            icmp6_ifstat_inc(ifp, ifs6_out_dstunreach); \
                            if (code == ICMP6_DST_UNREACH_ADMIN) \
                                    icmp6_ifstat_inc(ifp, ifs6_out_adminprohib); \
                            break; \
                    case ICMP6_PACKET_TOO_BIG: \
                            icmp6_ifstat_inc(ifp, ifs6_out_pkttoobig); \
                            break; \
                    case ICMP6_TIME_EXCEEDED: \
                            icmp6_ifstat_inc(ifp, ifs6_out_timeexceed); \
                            break; \
                    case ICMP6_PARAM_PROB: \
                            icmp6_ifstat_inc(ifp, ifs6_out_paramprob); \
                            break; \
                    case ICMP6_ECHO_REQUEST: \
                            icmp6_ifstat_inc(ifp, ifs6_out_echo); \
                            break; \
                    case ICMP6_ECHO_REPLY: \
                            icmp6_ifstat_inc(ifp, ifs6_out_echoreply); \
                            break; \
                    case MLD_LISTENER_QUERY: \
                            icmp6_ifstat_inc(ifp, ifs6_out_mldquery); \
                            break; \
                    case MLD_LISTENER_REPORT: \
                            icmp6_ifstat_inc(ifp, ifs6_out_mldreport); \
                            break; \
                    case MLD_LISTENER_DONE: \
                            icmp6_ifstat_inc(ifp, ifs6_out_mlddone); \
                            break; \
                    case ND_ROUTER_SOLICIT: \
                            icmp6_ifstat_inc(ifp, ifs6_out_routersolicit); \
                            break; \
                    case ND_ROUTER_ADVERT: \
                            icmp6_ifstat_inc(ifp, ifs6_out_routeradvert); \
                            break; \
                    case ND_NEIGHBOR_SOLICIT: \
                            icmp6_ifstat_inc(ifp, ifs6_out_neighborsolicit); \
                            break; \
                    case ND_NEIGHBOR_ADVERT: \
                            icmp6_ifstat_inc(ifp, ifs6_out_neighboradvert); \
                            break; \
                    case ND_REDIRECT: \
                            icmp6_ifstat_inc(ifp, ifs6_out_redirect); \
                            break; \
                   } \
   } while (/*CONSTCOND*/ 0)
   
   extern int      icmp6_rediraccept;      /* accept/process redirects */
   extern int      icmp6_redirtimeout;     /* cache time for redirect routes */
   #endif /* _KERNEL */
   
   #ifdef ICMP6_STRINGS
   /* Info: http://www.iana.org/assignments/icmpv6-parameters */
   
   static const char * const icmp6_type_err[] = {
           "reserved0", "unreach", "packet_too_big", "timxceed", "paramprob",
           NULL
   };
   
   static const char * const icmp6_type_info[] = {
           "echo", "echoreply",
           "mcastlistenq", "mcastlistenrep", "mcastlistendone",
           "rtsol", "rtadv", "neighsol", "neighadv", "redirect",
           "routerrenum", "nodeinfoq", "nodeinfor", "invneighsol", "invneighrep",
           "mcastlistenrep2", "haad_req", "haad_rep",
           "mobile_psol", "mobile_padv", "cga_sol", "cga_adv",
           "experimental150", "mcast_rtadv", "mcast_rtsol", "mcast_rtterm",
           "fmipv6_msg", "rpl_control", NULL
   };
   
   static const char * const icmp6_code_none[] = { "none", NULL };
   
   static const char * const icmp6_code_unreach[] = {
           "noroute", "admin", "beyondscope", "addr", "port",
           "srcaddr_policy", "reject_route", "source_route_err", NULL
   };
   
   static const char * const icmp6_code_timxceed[] = {
           "intrans", "reass", NULL
   };
   
   static const char * const icmp6_code_paramprob[] = {
           "hdr_field", "nxthdr_type", "option", NULL
   };      
   
   /* not all informational icmps that have codes have a names array */
   #endif
   
   #endif /* !_NETINET_ICMP6_H_ */

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