This is xnu-8019. See this file in:
/*
 * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
 *
 * This file contains Original Code and/or Modifications of Original Code
 * as defined in and that are subject to the Apple Public Source License
 * Version 2.0 (the 'License'). You may not use this file except in
 * compliance with the License. The rights granted to you under the License
 * may not be used to create, or enable the creation or redistribution of,
 * unlawful or unlicensed copies of an Apple operating system, or to
 * circumvent, violate, or enable the circumvention or violation of, any
 * terms of an Apple operating system software license agreement.
 *
 * Please obtain a copy of the License at
 * http://www.opensource.apple.com/apsl/ and read it before using this file.
 *
 * The Original Code and all software distributed under the License are
 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
 * Please see the License for the specific language governing rights and
 * limitations under the License.
 *
 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
 */
/*	$KAME: icmp6.h,v 1.46 2001/04/27 15:09:48 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. 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_
#ifndef DRIVERKIT
#include <netinet/in.h>
#include <sys/appleapiopts.h>
#include <sys/types.h>
#else
#include <sys/_types.h>
#endif /* DRIVERKIT */

#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;
} __attribute__((__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 */
#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 resp (to sender) */
#define MLD_MTRACE                      201     /* mtrace messages */

#ifndef KERNEL
#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_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_FIRSTFRAG_INCOMP_HDR     3       /* first fragment has incomplete IPv6 Header Chain */

#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 */
} __attribute__((__packed__));

/* 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_v2_reserved mld_icmp6_hdr.icmp6_data16[0]
#define mld_v2_numrecs  mld_icmp6_hdr.icmp6_data16[1]


#define ICMP6_ERRORTYPE(type) \
	((type) == ICMP6_DST_UNREACH || (type) == ICMP6_PACKET_TOO_BIG || \
	(type) == ICMP6_TIME_EXCEEDED || (type) == ICMP6_PARAM_PROB)
/*
 * Neighbor Discovery
 */

struct nd_router_solicit {      /* router solicitation */
	struct icmp6_hdr        nd_rs_hdr;
	/* could be followed by options */
}__attribute__((__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 */
} __attribute__((__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_HA           0x20

/* Router preference values based on RFC 4191 */
#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 */
}__attribute__((__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 */
}__attribute__((__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]
#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 */
}__attribute__((__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*/
}__attribute__((__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_NONCE                    14      /* RFC 3971 */
#define ND_OPT_ROUTE_INFO               24      /* RFC 4191 */
#define ND_OPT_RDNSS                    25      /* RFC 6106 */
#define ND_OPT_DNSSL                    31      /* RFC 6106 */
#define ND_OPT_CAPTIVE_PORTAL           37      /* RFC 7710 */
#define ND_OPT_PREF64                   38      /* RFC 8781 */

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;
}__attribute__((__packed__));

#define ND_OPT_PI_FLAG_ONLINK           0x80
#define ND_OPT_PI_FLAG_AUTO             0x40

#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 {           /* nonce option */
	u_int8_t        nd_opt_nonce_type;
	u_int8_t        nd_opt_nonce_len;
	u_int8_t        nd_opt_nonce[ND_OPT_NONCE_LEN];
} __attribute__((__packed__));

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 */
} __attribute__((__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;
}__attribute__((__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;
	/* prefix follows */
}__attribute__((__packed__));

struct nd_opt_rdnss {   /* recursive domain name system servers */
	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;
	struct in6_addr     nd_opt_rdnss_addr[1];
} __attribute__((__packed__));

struct nd_opt_dnssl {   /* domain name search list */
	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;
	u_int8_t            nd_opt_dnssl_domains[8];
} __attribute__((__packed__));

/*
 * PREF64 (NAT64 prefix) RFC 8781
 */
struct nd_opt_pref64 {   /* NAT64 prefix */
	u_int8_t            nd_opt_pref64_type;
	u_int8_t            nd_opt_pref64_len;
	u_int16_t           nd_opt_pref64_scaled_lifetime_plc;
	u_int32_t           nd_opt_pref64_prefix[3];
} __attribute__((__packed__));

#define ND_OPT_PREF64_SCALED_LIFETIME_MASK      0xfff8
#define ND_OPT_PREF64_PLC_MASK                  0x0007
#define ND_OPT_PREF64_LIFETIME_MAX              65528
#define ND_OPT_PREF64_PLC_32                    5
#define ND_OPT_PREF64_PLC_40                    4
#define ND_OPT_PREF64_PLC_48                    3
#define ND_OPT_PREF64_PLC_56                    2
#define ND_OPT_PREF64_PLC_64                    1
#define ND_OPT_PREF64_PLC_96                    0

/*
 * 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 */
}__attribute__((__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 */
}__attribute__((__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 */

#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 */
}__attribute__((__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;
} __attribute__((__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;
} __attribute__((__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;
} __attribute__((__packed__));
#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;
} __attribute__((__packed__));
#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];
};

#ifdef KERNEL
#define ICMP6_FILTER_SETPASSALL(filterp) \
do {                                                            \
	int i; u_char *ptr;                                     \
	ptr = (u_char *)filterp;                                        \
	for (i = 0; i < sizeof(struct icmp6_filter); i++)       \
	        ptr[i] = 0xff;                                  \
} while (0)
#define ICMP6_FILTER_SETBLOCKALL(filterp) \
	bzero(filterp, sizeof(struct icmp6_filter))
#else /* KERNEL */
#define ICMP6_FILTER_SETPASSALL(filterp) \
	memset(filterp, 0xff, sizeof(struct icmp6_filter))
#define ICMP6_FILTER_SETBLOCKALL(filterp) \
	memset(filterp, 0x00, sizeof(struct icmp6_filter))
#endif /* KERNEL */

#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 icmp6errstat {
	u_quad_t icp6errs_dst_unreach_noroute;
	u_quad_t icp6errs_dst_unreach_admin;
	u_quad_t icp6errs_dst_unreach_beyondscope;
	u_quad_t icp6errs_dst_unreach_addr;
	u_quad_t icp6errs_dst_unreach_noport;
	u_quad_t icp6errs_packet_too_big;
	u_quad_t icp6errs_time_exceed_transit;
	u_quad_t icp6errs_time_exceed_reassembly;
	u_quad_t icp6errs_paramprob_header;
	u_quad_t icp6errs_paramprob_nextheader;
	u_quad_t icp6errs_paramprob_option;
	u_quad_t icp6errs_redirect; /* we regard redirect as an error here */
	u_quad_t icp6errs_unknown;
};

struct icmp6stat {
/* statistics related to icmp6 packets generated */
	u_quad_t icp6s_error;           /* # of calls to icmp6_error */
	u_quad_t icp6s_canterror;       /* no error 'cuz old was icmp */
	u_quad_t icp6s_toofreq;         /* no error 'cuz rate limitation */
	u_quad_t icp6s_outhist[256];
/* statistics related to input message processed */
	u_quad_t icp6s_badcode;         /* icmp6_code out of range */
	u_quad_t icp6s_tooshort;        /* packet < sizeof(struct icmp6_hdr) */
	u_quad_t icp6s_checksum;        /* bad checksum */
	u_quad_t icp6s_badlen;          /* calculated bound mismatch */
	u_quad_t icp6s_reflect;         /* number of responses */
	u_quad_t icp6s_inhist[256];
	u_quad_t icp6s_nd_toomanyopt;   /* too many ND options */
	struct icmp6errstat icp6s_outerrhist;
#define icp6s_odst_unreach_noroute \
	icp6s_outerrhist.icp6errs_dst_unreach_noroute
#define icp6s_odst_unreach_admin icp6s_outerrhist.icp6errs_dst_unreach_admin
#define icp6s_odst_unreach_beyondscope \
	icp6s_outerrhist.icp6errs_dst_unreach_beyondscope
#define icp6s_odst_unreach_addr icp6s_outerrhist.icp6errs_dst_unreach_addr
#define icp6s_odst_unreach_noport icp6s_outerrhist.icp6errs_dst_unreach_noport
#define icp6s_opacket_too_big icp6s_outerrhist.icp6errs_packet_too_big
#define icp6s_otime_exceed_transit \
	icp6s_outerrhist.icp6errs_time_exceed_transit
#define icp6s_otime_exceed_reassembly \
	icp6s_outerrhist.icp6errs_time_exceed_reassembly
#define icp6s_oparamprob_header icp6s_outerrhist.icp6errs_paramprob_header
#define icp6s_oparamprob_nextheader \
	icp6s_outerrhist.icp6errs_paramprob_nextheader
#define icp6s_oparamprob_option icp6s_outerrhist.icp6errs_paramprob_option
#define icp6s_oredirect icp6s_outerrhist.icp6errs_redirect
#define icp6s_ounknown icp6s_outerrhist.icp6errs_unknown
	u_quad_t icp6s_pmtuchg;         /* path MTU changes */
	u_quad_t icp6s_nd_badopt;       /* bad ND options */
	u_quad_t icp6s_badns;           /* bad neighbor solicitation */
	u_quad_t icp6s_badna;           /* bad neighbor advertisement */
	u_quad_t icp6s_badrs;           /* bad router advertisement */
	u_quad_t icp6s_badra;           /* bad router advertisement */
	u_quad_t icp6s_badredirect;     /* bad redirect message */
	u_quad_t icp6s_rfc6980_drop;    /* NDP packet dropped based on RFC 6980 */
	u_quad_t icp6s_badpkttoobig;    /* bad packet too big */
};

/*
 * 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
#define ICMPV6CTL_ND6_DRLIST            19
#define ICMPV6CTL_ND6_PRLIST            20
#define ICMPV6CTL_MLD_MAXSRCFILTER      21
#define ICMPV6CTL_MLD_SOMAXSRC          22
#define ICMPV6CTL_MLD_VERSION           23
#define ICMPV6CTL_ND6_MAXQLEN           24
#define ICMPV6CTL_ND6_ACCEPT_6TO4       25
#define ICMPV6CTL_ND6_OPTIMISTIC_DAD    26      /* RFC 4429 */
#define ICMPV6CTL_ERRPPSLIMIT_RANDOM_INCR 27
#define ICMPV6CTL_MAXID                 28

#ifdef BSD_KERNEL_PRIVATE
#define ICMPV6CTL_NAMES { \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "rediraccept", CTLTYPE_INT }, \
	{ "redirtimeout", CTLTYPE_INT }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "nd6_prune", CTLTYPE_INT }, \
	{ 0, 0 }, \
	{ "nd6_delay", CTLTYPE_INT }, \
	{ "nd6_umaxtries", CTLTYPE_INT }, \
	{ "nd6_mmaxtries", CTLTYPE_INT }, \
	{ "nd6_useloopback", CTLTYPE_INT }, \
	{ 0, 0 }, \
	{ "nodeinfo", CTLTYPE_INT }, \
	{ "errppslimit", CTLTYPE_INT }, \
	{ "nd6_maxnudhint", CTLTYPE_INT }, \
	{ "mtudisc_hiwat", CTLTYPE_INT }, \
	{ "mtudisc_lowat", CTLTYPE_INT }, \
	{ "nd6_debug", CTLTYPE_INT }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ 0, 0 }, \
	{ "nd6_accept_6to4", CTLTYPE_INT }, \
	{ "nd6_optimistic_dad", CTLTYPE_INT }, \
}

# ifdef __STDC__
struct  rtentry;
struct  rttimer;
struct  in6_multi;
# endif
struct ip6protosw;
void    icmp6_init(struct ip6protosw *, struct domain *);
void    icmp6_paramerror(struct mbuf *, int);

void    icmp6_error_flag(struct mbuf *, int, int, int, int);
#define ICMP6_ERROR_RST_MRCVIF  0x1

void    icmp6_error(struct mbuf *, int, int, int);
int     icmp6_input(struct mbuf **, int *, int);
void    icmp6_reflect(struct mbuf *, size_t);
void    icmp6_prepare(struct mbuf *);
void    icmp6_redirect_input(struct mbuf *, int, int);
void    icmp6_redirect_output(struct mbuf *, struct rtentry *);

struct  ip6ctlparam;
void    icmp6_mtudisc_update(struct ip6ctlparam *, int);

extern lck_rw_t icmp6_ifs_rwlock;
/* XXX: is this the right place for these macros? */
/* N.B.: if_inet6data is never freed once set, so we don't need to lock */
#define icmp6_ifstat_inc(_ifp, _tag) do {                       \
	if (_ifp != NULL && IN6_IFEXTRA(_ifp) != NULL) {        \
	        IN6_IFEXTRA(_ifp)->icmp6_ifstat._tag++;         \
	}                                                       \
} while (0)

#define icmp6_ifoutstat_inc(ifp, type, code) do {               \
	icmp6_ifstat_inc(ifp, ifs6_out_msg);                    \
	if (type < ICMP6_INFOMSG_MASK)                          \
	        icmp6_ifstat_inc(ifp, ifs6_out_error);          \
	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 (0)

#define ICMP6_REDIRACCEPT_DEFAULT       1
extern int      icmp6_rediraccept;      /* accept/process redirects */
extern int      icmp6_redirtimeout;     /* cache time for redirect routes */

#define ICMP6_NODEINFO_FQDNOK           0x1
#define ICMP6_NODEINFO_NODEADDROK       0x2
#define ICMP6_NODEINFO_TMPADDROK        0x4
#define ICMP6_NODEINFO_GLOBALOK         0x8

#endif /* BSD_KERNEL_PRIVATE */

#endif /* !_NETINET_ICMP6_H_ */