xref: /freebsd/sys/netinet/icmp6.h (revision d18b4bec98f1cf3c51103a22c0c041e6238c44c7)

/*	$FreeBSD$	*/
/*	$KAME: icmp6.h,v 1.46 2001/04/27 15:09:48 itojun Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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 */
#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_DST_UNREACH_POLICY	5	/* failed ingress/egress policy */
#define ICMP6_DST_UNREACH_REJECT	6	/* Reject route to destination */
#define ICMP6_DST_UNREACH_SRCROUTE	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_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;

/* 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]

/*
 * 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_HA		0x20

/*
 * Router preference values based on draft-draves-ipngwg-router-selection-01.
 * These are non-standard definitions.
 */
#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 */

#ifdef EXPERIMENTAL
#define	ND_RA_FLAG_IPV6_ONLY	0x02 /* draft-ietf-6man-ipv6only-flag */
#endif

#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]
#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 */
} __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_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_MAX			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;

#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];
} __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 */
} __packed;

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 recursive DNS servers */
} __packed;

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 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 */

#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 */
} __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

#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;
} __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 *p;					\
	p = (u_char *)filterp;					\
	for (i = 0; i < sizeof(struct icmp6_filter); i++)	\
		p[i] = 0xff;					\
} while (/*CONSTCOND*/ 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 {
	uint64_t icp6errs_dst_unreach_noroute;
	uint64_t icp6errs_dst_unreach_admin;
	uint64_t icp6errs_dst_unreach_beyondscope;
	uint64_t icp6errs_dst_unreach_addr;
	uint64_t icp6errs_dst_unreach_noport;
	uint64_t icp6errs_packet_too_big;
	uint64_t icp6errs_time_exceed_transit;
	uint64_t icp6errs_time_exceed_reassembly;
	uint64_t icp6errs_paramprob_header;
	uint64_t icp6errs_paramprob_nextheader;
	uint64_t icp6errs_paramprob_option;
	uint64_t icp6errs_redirect; /* we regard redirect as an error here */
	uint64_t icp6errs_unknown;
};

struct icmp6stat {
/* statistics related to icmp6 packets generated */
	uint64_t icp6s_error;		/* # of calls to icmp6_error */
	uint64_t icp6s_canterror;	/* no error 'cuz old was icmp */
	uint64_t icp6s_toofreq;		/* no error 'cuz rate limitation */
	uint64_t icp6s_outhist[256];
/* statistics related to input message processed */
	uint64_t icp6s_badcode;		/* icmp6_code out of range */
	uint64_t icp6s_tooshort;	/* packet < sizeof(struct icmp6_hdr) */
	uint64_t icp6s_checksum;	/* bad checksum */
	uint64_t icp6s_badlen;		/* calculated bound mismatch */
	uint64_t icp6s_dropped;		/* # of packets dropped waiting for a resolution */
	/*
	 * number of responses: this member is inherited from netinet code, but
	 * for netinet6 code, it is already available in icp6s_outhist[].
	 */
	uint64_t icp6s_reflect;
	uint64_t icp6s_inhist[256];
	uint64_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
	uint64_t icp6s_pmtuchg;		/* path MTU changes */
	uint64_t icp6s_nd_badopt;	/* bad ND options */
	uint64_t icp6s_badns;		/* bad neighbor solicitation */
	uint64_t icp6s_badna;		/* bad neighbor advertisement */
	uint64_t icp6s_badrs;		/* bad router solicitation */
	uint64_t icp6s_badra;		/* bad router advertisement */
	uint64_t icp6s_badredirect;	/* bad redirect message */
	uint64_t icp6s_overflowdefrtr;	/* Too many default routers. */
	uint64_t icp6s_overflowprfx;	/* Too many prefixes. */
	uint64_t icp6s_overflownndp;	/* Too many neighbour entries. */
	uint64_t icp6s_overflowredirect;/* Too many redirects. */
	uint64_t icp6s_invlhlim;	/* Invalid hop limit. */
	uint64_t icp6s_spare[32];
};

#ifdef _KERNEL
#include <sys/counter.h>

VNET_PCPUSTAT_DECLARE(struct icmp6stat, icmp6stat);
/*
 * In-kernel consumers can use these accessor macros directly to update
 * stats.
 */
#define	ICMP6STAT_ADD(name, val)	\
    VNET_PCPUSTAT_ADD(struct icmp6stat, icmp6stat, name, (val))
#define	ICMP6STAT_INC(name)		ICMP6STAT_ADD(name, 1)

/*
 * Kernel module consumers must use this accessor macro.
 */
void	kmod_icmp6stat_inc(int statnum);
#define	KMOD_ICMP6STAT_INC(name)	\
    kmod_icmp6stat_inc(offsetof(struct icmp6stat, name) / sizeof(uint64_t))
#endif

/*
 * 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_NODEINFO_OLDMCPREFIX	25
#define ICMPV6CTL_MAXID		26

#ifdef _KERNEL
# ifdef __STDC__
struct	nhop_object;
struct	rttimer;
struct	in6_multi;
# endif
void	icmp6_paramerror(struct mbuf *, int);
void	icmp6_error(struct mbuf *, int, int, int);
void	icmp6_error2(struct mbuf *, int, int, int, struct ifnet *);
int	icmp6_input(struct mbuf **, int *, int);
void	icmp6_fasttimo(void);
void	icmp6_slowtimo(void);
void	icmp6_prepare(struct mbuf *);
void	icmp6_redirect_input(struct mbuf *, int);
void	icmp6_redirect_output(struct mbuf *, struct nhop_object *);

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

/* XXX: is this the right place for these macros? */
#define icmp6_ifstat_inc(ifp, tag) \
do {								\
	if (ifp)						\
		counter_u64_add(((struct in6_ifextra *)		\
		    ((ifp)->if_afdata[AF_INET6]))->icmp6_ifstat[\
		    offsetof(struct icmp6_ifstat, tag) / sizeof(uint64_t)], 1);\
} while (/*CONSTCOND*/ 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 (/*CONSTCOND*/ 0)

VNET_DECLARE(int, icmp6_rediraccept);	/* accept/process redirects */
VNET_DECLARE(int, icmp6_redirtimeout);	/* cache time for redirect routes */

#define	V_icmp6_rediraccept	VNET(icmp6_rediraccept)
#define	V_icmp6_redirtimeout	VNET(icmp6_redirtimeout)

#define ICMP6_NODEINFO_FQDNOK		0x1
#define ICMP6_NODEINFO_NODEADDROK	0x2
#define ICMP6_NODEINFO_TMPADDROK	0x4
#define ICMP6_NODEINFO_GLOBALOK		0x8
#endif /* _KERNEL */

#endif /* not _NETINET_ICMP6_H_ */