/*      $OpenBSD: icmp6.h,v 1.57 2025/09/16 09:19:43 florian 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;
} __packed;

#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 */

/* 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 */

#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 */

#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_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_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_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 */
} __packed;

/* 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]

/*
 * Neighbor Discovery
 */

struct nd_router_solicit {      /* router solicitation */
        struct icmp6_hdr        nd_rs_hdr;
        /* could be followed by options */
} __packed;

#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 */
} __packed;

#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_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 */
} __packed;

#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 */
} __packed;

#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]
#define ND_NA_FLAG_ROUTER               htonl(0x80000000)
#define ND_NA_FLAG_SOLICITED            htonl(0x40000000)
#define ND_NA_FLAG_OVERRIDE             htonl(0x20000000)

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 */
} __packed;

#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*/
} __packed;

#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_ROUTE_INFO               24
#define ND_OPT_RDNSS                    25
#define ND_OPT_DNSSL                    31

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;
} __packed;

#define ND_OPT_PI_FLAG_ONLINK           0x80
#define ND_OPT_PI_FLAG_AUTO             0x40

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 */
} __packed;

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;
} __packed;

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;
} __packed;

struct nd_opt_rdnss {           /* RDNSS option */
        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 recursive DNS servers */
} __packed;

struct nd_opt_dnssl {           /* DNSSL option */
        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 DNS search domains */
} __packed;

/*
 * 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 */
} __packed;

/*
 * 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 */
} __packed;

#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 */

#define NI_SUPTYPE_FLAG_COMPRESS        htons(0x0001)
#define NI_FQDN_FLAG_VALIDTTL           htons(0x0001)

#define NI_NODEADDR_FLAG_TRUNCATE       htons(0x0001)
#define NI_NODEADDR_FLAG_ALL            htons(0x0002)
#define NI_NODEADDR_FLAG_COMPAT         htons(0x0004)
#define NI_NODEADDR_FLAG_LINKLOCAL      htons(0x0008)
#define NI_NODEADDR_FLAG_SITELOCAL      htons(0x0010)
#define NI_NODEADDR_FLAG_GLOBAL         htons(0x0020)
#define NI_NODEADDR_FLAG_ANYCAST        htons(0x0040)   /* not in spec */

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 */
} __packed;

/*
 * 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;
} __packed;

#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;
} __packed;

#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;
} __packed;
#define ICMP6_RR_PCOUSE_RAFLAGS_ONLINK  0x80
#define ICMP6_RR_PCOUSE_RAFLAGS_AUTO    0x40

#define ICMP6_RR_PCOUSE_FLAGS_DECRVLTIME     htonl(0x80000000)
#define ICMP6_RR_PCOUSE_FLAGS_DECRPLTIME     htonl(0x40000000)

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;
} __packed;
#define ICMP6_RR_RESULT_FLAGS_OOB               htons(0x0002)
#define ICMP6_RR_RESULT_FLAGS_FORBIDDEN         htons(0x0001)

/*
 * icmp6 filter structures.
 */

struct icmp6_filter {
        u_int32_t icmp6_filt[8];
};

#define ICMP6_FILTER_SETPASSALL(filterp) \
        memset(filterp, 0xff, sizeof(struct icmp6_filter))
#define ICMP6_FILTER_SETBLOCKALL(filterp) \
        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.
 */
struct icmp6stat {
/* statistics related to icmp6 packets generated */
        u_int64_t icp6s_error;          /* # of calls to icmp6_error */
        u_int64_t icp6s_canterror;      /* no error because old was icmp */
        u_int64_t icp6s_toofreq;        /* no error because rate limitation */
        u_int64_t icp6s_outhist[256];
/* statistics related to input message processed */
        u_int64_t icp6s_badcode;        /* icmp6_code out of range */
        u_int64_t icp6s_tooshort;       /* packet < sizeof(struct icmp6_hdr) */
        u_int64_t icp6s_checksum;       /* bad checksum */
        u_int64_t icp6s_badlen;         /* calculated bound mismatch */
        /*
         * number of responses: this member is inherited from netinet code, but
         * for netinet6 code, it is already available in icp6s_outhist[].
         */
        u_int64_t icp6s_reflect;
        u_int64_t icp6s_inhist[256];
        u_int64_t icp6s_nd_toomanyopt;  /* too many ND options */
        u_int64_t icp6s_odst_unreach_noroute;
        u_int64_t icp6s_odst_unreach_admin;
        u_int64_t icp6s_odst_unreach_beyondscope;
        u_int64_t icp6s_odst_unreach_addr;
        u_int64_t icp6s_odst_unreach_noport;
        u_int64_t icp6s_opacket_too_big;
        u_int64_t icp6s_otime_exceed_transit;
        u_int64_t icp6s_otime_exceed_reassembly;
        u_int64_t icp6s_oparamprob_header;
        u_int64_t icp6s_oparamprob_nextheader;
        u_int64_t icp6s_oparamprob_option;
        u_int64_t icp6s_oredirect;      /* we regard redirect as an error here */
        u_int64_t icp6s_ounknown;
        u_int64_t icp6s_pmtuchg;        /* path MTU changes */
        u_int64_t icp6s_nd_badopt;      /* bad ND options */
        u_int64_t icp6s_badns;          /* bad neighbor solicitation */
        u_int64_t icp6s_badna;          /* bad neighbor advertisement */
        u_int64_t icp6s_badrs;          /* bad router advertisement */
        u_int64_t icp6s_badra;          /* bad router advertisement */
        u_int64_t icp6s_badredirect;    /* bad redirect message */
};

/*
 * Names for ICMP sysctl objects
 */
#define ICMPV6CTL_STATS         1
#define ICMPV6CTL_REDIRACCEPT   2       /* accept/process redirects */
#define ICMPV6CTL_REDIRTIMEOUT  3       /* redirect cache time */
#define ICMPV6CTL_ND6_DELAY     8
#define ICMPV6CTL_ND6_UMAXTRIES 9
#define ICMPV6CTL_ND6_MMAXTRIES 10
#define ICMPV6CTL_ND6_QUEUED    11
#define ICMPV6CTL_NODEINFO      13
#define ICMPV6CTL_ERRPPSLIMIT   14      /* ICMPv6 error pps limitation */
#define ICMPV6CTL_MTUDISC_HIWAT 16
#define ICMPV6CTL_MTUDISC_LOWAT 17
#define ICMPV6CTL_MAXID         18

#define ICMPV6CTL_NAMES { \
        { 0, 0 }, \
        { 0, 0 }, \
        { 0, 0 }, \
        { "redirtimeout", CTLTYPE_INT }, \
        { 0, 0 }, \
        { 0, 0 }, \
        { 0, 0 }, \
        { 0, 0 }, \
        { "nd6_delay", CTLTYPE_INT }, \
        { "nd6_umaxtries", CTLTYPE_INT }, \
        { "nd6_mmaxtries", CTLTYPE_INT }, \
        { "nd6_queued", CTLTYPE_INT }, \
        { 0, 0 }, \
        { 0, 0 }, \
        { "errppslimit", CTLTYPE_INT }, \
        { 0, 0 }, \
        { "mtudisc_hiwat", CTLTYPE_INT }, \
        { "mtudisc_lowat", CTLTYPE_INT }, \
}

#define RTF_PROBEMTU    RTF_PROTO1

#ifdef _KERNEL

#include <sys/percpu.h>

enum icmp6stat_counters {
        icp6s_error,
        icp6s_canterror,
        icp6s_toofreq,
        icp6s_outhist,
        icp6s_badcode = icp6s_outhist + 256,
        icp6s_tooshort,
        icp6s_checksum,
        icp6s_badlen,
        icp6s_reflect,
        icp6s_inhist,
        icp6s_nd_toomanyopt = icp6s_inhist + 256,
        icp6s_odst_unreach_noroute,
        icp6s_odst_unreach_admin,
        icp6s_odst_unreach_beyondscope,
        icp6s_odst_unreach_addr,
        icp6s_odst_unreach_noport,
        icp6s_opacket_too_big,
        icp6s_otime_exceed_transit,
        icp6s_otime_exceed_reassembly,
        icp6s_oparamprob_header,
        icp6s_oparamprob_nextheader,
        icp6s_oparamprob_option,
        icp6s_oredirect,
        icp6s_ounknown,
        icp6s_pmtuchg,
        icp6s_nd_badopt,
        icp6s_badns,
        icp6s_badna,
        icp6s_badrs,
        icp6s_badra,
        icp6s_badredirect,
        icp6s_ncounters,
};

extern struct cpumem *icmp6counters;

static inline void
icmp6stat_inc(enum icmp6stat_counters c)
{
        counters_inc(icmp6counters, c);
}

struct  rtentry;
struct  rttimer;
struct  in6_multi;

void             icmp6_init(void);
struct mbuf     *icmp6_do_error(struct mbuf *, int, int, int);
void             icmp6_error(struct mbuf *, int, int, int);
int              icmp6_input(struct mbuf **, int *, int, int,
                    struct netstack *);
void             icmp6_fasttimo(void);
int              icmp6_reflect(struct mbuf **, size_t, struct sockaddr *);
void             icmp6_redirect_input(struct mbuf *, int);
void             icmp6_redirect_output(struct mbuf *, struct rtentry *);
int              icmp6_sysctl(int *, u_int, void *, size_t *, void *, size_t);
struct rtentry  *icmp6_mtudisc_clone(struct sockaddr_in6 *, u_int, int);

struct  ip6ctlparam;
void    icmp6_mtudisc_update(struct ip6ctlparam *, int);
void    icmp6_mtudisc_callback_register(void (*)(struct sockaddr_in6 *, u_int));

extern int      icmp6_redirtimeout;     /* cache time for redirect routes */

#endif /* _KERNEL */
#endif /* _NETINET_ICMP6_H_ */