//==========================================================================
//
//      include/netinet/icmp6.h
//
//==========================================================================
//####BSDCOPYRIGHTBEGIN####
//
// -------------------------------------------
//
// Portions of this software may have been derived from OpenBSD, 
// FreeBSD or other sources, and are covered by the appropriate
// copyright disclaimers included herein.
//
// Portions created by Red Hat are
// Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
//
// -------------------------------------------
//
//####BSDCOPYRIGHTEND####
//==========================================================================

/*	$KAME: icmp6.h,v 1.66 2001/12/18 02:19:14 jinmei 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__ ((aligned(1), 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 MLD_LISTENER_QUERY		130 	/* multicast listener query */
#define ICMP6_MEMBERSHIP_REPORT		131	/* group membership report */
#define MLD_LISTENER_REPORT		131	/* multicast listener report */
#define ICMP6_MEMBERSHIP_REDUCTION	132	/* group membership termination */
#define MLD_LISTENER_DONE		132	/* multicast listener done */

#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 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 belows are not yet defined in 2292bis. They will be renamed */
#define IND_SOLICIT			141	/* inverse neighbor solicitation */
#define IND_ADVERT			142	/* inverse neighbor advertisment */

/* Folloing numbers are defined in the mobile-ip draft. */
#define ICMP6_HADISCOV_REQUEST		150	/* XXX To be authorized */
#define ICMP6_HADISCOV_REPLY		151	/* XXX To be authorized */
#define ICMP6_MOBILEPREFIX_SOLICIT	152	/* XXX To be authorized */
#define ICMP6_MOBILEPREFIX_ADVERT	153	/* XXX To be authorized */

/* The definitions below are experimental. TBA */
#define MLD_MTRACE_RESP			200	/* mtrace resp (to sender) */
#define MLD_MTRACE			201	/* mtrace messages */

#define MLDV2_LISTENER_REPORT		206	/* MLDv2 report */
 
#ifndef _KERNEL
#define MLD6_MTRACE_RESP	MLD_MTRACE_RESP
#define MLD6_MTRACE		MLD_MTRACE
#define MLD6V2_LISTENER_REPORT	MLDV2_LISTENER_REPORT
#endif

#define ICMP6_MAXTYPE			206

#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 mld_hdr {
	struct icmp6_hdr	mld_icmp6_hdr;
	struct in6_addr		mld_addr; /* multicast address */
} __attribute__ ((aligned(1), 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]

/*
 * Neighbor Discovery
 */

struct nd_router_solicit {	/* router solicitation */
	struct icmp6_hdr 	nd_rs_hdr;
	/* could be followed by options */
} __attribute__ ((aligned(1), 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__ ((aligned(1), 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_HOME_AGENT	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 */

#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__((aligned(1), 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__((aligned(1), 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