NetBSD/sys/netinet/icmp6.h

/*	$NetBSD: icmp6.h,v 1.25 2002/11/02 07:28:10 perry Exp $	*/
/*	$KAME: icmp6.h,v 1.39 2001/02/06 03:48:06 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_

#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 ICMP6_MEMBERSHIP_QUERY		130	/* group membership query */
#define MLD6_LISTENER_QUERY		130 	/* multicast listener query */
#define ICMP6_MEMBERSHIP_REPORT		131	/* group membership report */
#define MLD6_LISTENER_REPORT		131	/* multicast listener report */
#define ICMP6_MEMBERSHIP_REDUCTION	132	/* group membership termination */
#define MLD6_LISTENER_DONE		132	/* multicast listener done */

#define ND_ROUTER_SOLICIT		133	/* router solicitation */
#define ND_ROUTER_ADVERT		134	/* router advertisment */
#define ND_NEIGHBOR_SOLICIT		135	/* neighbor solicitation */
#define ND_NEIGHBOR_ADVERT		136	/* neighbor advertisment */
#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 */

/* The definitions below are experimental. TBA */
#define MLD6_MTRACE_RESP		200	/* mtrace response(to sender) */
#define MLD6_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_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_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 mld6_hdr {
	struct icmp6_hdr	mld6_hdr;
	struct in6_addr		mld6_addr; /* multicast address */
} __attribute__((__packed__));

#define mld6_type	mld6_hdr.icmp6_type
#define mld6_code	mld6_hdr.icmp6_code
#define mld6_cksum	mld6_hdr.icmp6_cksum
#define mld6_maxdelay	mld6_hdr.icmp6_data16[0]
#define mld6_reserved	mld6_hdr.icmp6_data16[1]

/*
 * 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_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

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

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__));

/*
 * 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 *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 {
	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 */
	/*
	 * number of responses: this member is inherited from netinet code, but
	 * for netinet6 code, it is already available in icp6s_outhist[].
	 */
	u_quad_t icp6s_reflect;
	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 */
};

/*
 * 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_MAXID		21

#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 }, \
}

#define RTF_PROBEMTU	RTF_PROTO1

#ifdef _KERNEL
# ifdef __STDC__
struct	rtentry;
struct	rttimer;
struct	in6_multi;
# endif
void	icmp6_init __P((void));
void	icmp6_paramerror __P((struct mbuf *, int));
void	icmp6_error __P((struct mbuf *, int, int, int));
int	icmp6_input __P((struct mbuf **, int *, int));
void	icmp6_fasttimo __P((void));
void	icmp6_reflect __P((struct mbuf *, size_t));
void	icmp6_prepare __P((struct mbuf *));
void	icmp6_redirect_input __P((struct mbuf *, int));
void	icmp6_redirect_output __P((struct mbuf *, struct rtentry *));
int	icmp6_sysctl __P((int *, u_int, void *, size_t *, void *, size_t));

struct	ip6ctlparam;
void	icmp6_mtudisc_update __P((struct ip6ctlparam *, int));
void	icmp6_mtudisc_callback_register __P((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 MLD6_LISTENER_QUERY: \
			 icmp6_ifstat_inc(ifp, ifs6_out_mldquery); \
			 break; \
		 case MLD6_LISTENER_REPORT: \
			 icmp6_ifstat_inc(ifp, ifs6_out_mldreport); \
			 break; \
		 case MLD6_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 */

#endif /* not _NETINET_ICMP6_H_ */