packet-ipv6.h

/* packet-ipv6.h
 * Definitions for IPv6 packet disassembly 
 *
 * $Id: packet-ipv6.h,v 1.11 1999/12/06 20:20:35 guy Exp $
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@zing.org>
 * Copyright 1998 Gerald Combs
 *
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#ifndef __PACKET_IPV6_H_DEFINED__
#define __PACKET_IPV6_H_DEFINED__

struct e_in6_addr {
	union {
		guint32  u6_addr32[4];
		guint16  u6_addr16[8];
		guint8   u6_addr8[16];
	} u6_addr;			/* 128 bit IP6 address */
};

#ifdef s6_addr32
#undef s6_addr32
#endif

#ifdef s6_addr16
#undef s6_addr16
#endif

#ifdef s6_addr8
#undef s6_addr8
#endif

#ifdef s6_addr
#undef s6_addr
#endif

#define s6_addr32 u6_addr.u6_addr32
#define s6_addr16 u6_addr.u6_addr16
#define s6_addr8  u6_addr.u6_addr8
#define s6_addr   u6_addr.u6_addr8

#define INET6_ADDRSTRLEN	46

/*
 * Definition for internet protocol version 6.
 * RFC 1883
 */
struct ip6_hdr {
	union {
		struct ip6_hdrctl {
			guint32 ip6_un1_flow;	/* 20 bits of flow-ID */
			guint16 ip6_un1_plen;	/* payload length */
			guint8  ip6_un1_nxt;	/* next header */
			guint8  ip6_un1_hlim;	/* hop limit */
		} ip6_un1;
		guint8 ip6_un2_vfc;	/* 4 bits version, 4 bits class */
	} ip6_ctlun;
	struct e_in6_addr ip6_src;	/* source address */
	struct e_in6_addr ip6_dst;	/* destination address */
};

#define ip6_vfc		ip6_ctlun.ip6_un2_vfc
#define ip6_flow	ip6_ctlun.ip6_un1.ip6_un1_flow
#define ip6_plen	ip6_ctlun.ip6_un1.ip6_un1_plen
#define ip6_nxt		ip6_ctlun.ip6_un1.ip6_un1_nxt
#define ip6_hlim	ip6_ctlun.ip6_un1.ip6_un1_hlim
#define ip6_hops	ip6_ctlun.ip6_un1.ip6_un1_hlim

/* Offsets of fields within an IPv6 header. */
#define	IP6H_CTL	0
#define	IP6H_CTL_FLOW	0
#define	IP6H_CTL_PLEN	4
#define	IP6H_CTL_NXT	6
#define	IP6H_CTL_HLIM	7
#define	IP6H_CTL_VFC	0
#define	IP6H_SRC	8
#define	IP6H_DST	24

#ifdef WORDS_BIGENDIAN
#define IPV6_FLOWINFO_MASK	0x0fffffff	/* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK	0x000fffff	/* flow label (20 bits) */
#else
#define IPV6_FLOWINFO_MASK	0xffffff0f	/* flow info (28 bits) */
#define IPV6_FLOWLABEL_MASK	0xffff0f00	/* flow label (20 bits) */
#endif

/*
 * Extension Headers
 */

struct	ip6_ext {
	u_char	ip6e_nxt;
	u_char	ip6e_len;
};

/* Hop-by-Hop options header */
/* XXX should we pad it to force alignment on an 8-byte boundary? */
struct ip6_hbh {
	guint8 ip6h_nxt;	/* next header */
	guint8 ip6h_len;	/* length in units of 8 octets */
	/* followed by options */
};

/* Destination options header */
/* XXX should we pad it to force alignment on an 8-byte boundary? */
struct ip6_dest {
	guint8 ip6d_nxt;	/* next header */
	guint8 ip6d_len;	/* length in units of 8 octets */
	/* followed by options */
};

/* Option types and related macros */
#define IP6OPT_PAD1		0x00	/* 00 0 00000 */
#define IP6OPT_PADN		0x01	/* 00 0 00001 */
#define IP6OPT_JUMBO		0xC2	/* 11 0 00010 = 194 */
#define IP6OPT_JUMBO_LEN	6
#define IP6OPT_RTALERT		0x05	/* 00 0 00101 */
#define IP6OPT_RTALERT_LEN	4
#define IP6OPT_RTALERT_MLD	0	/* Datagram contains MLD message */
#define IP6OPT_RTALERT_RSVP	1	/* Datagram contains RSVP message */
#define IP6OPT_MINLEN		2

#define IP6OPT_TYPE(o)		((o) & 0xC0)
#define IP6OPT_TYPE_SKIP	0x00
#define IP6OPT_TYPE_DISCARD	0x40
#define IP6OPT_TYPE_FORCEICMP	0x80
#define IP6OPT_TYPE_ICMP	0xC0

#define IP6OPT_MUTABLE		0x20

/* Routing header */
struct ip6_rthdr {
	guint8  ip6r_nxt;	/* next header */
	guint8  ip6r_len;	/* length in units of 8 octets */
	guint8  ip6r_type;	/* routing type */
	guint8  ip6r_segleft;	/* segments left */
	/* followed by routing type specific data */
};

/* Type 0 Routing header */
struct ip6_rthdr0 {
	guint8  ip6r0_nxt;		/* next header */
	guint8  ip6r0_len;		/* length in units of 8 octets */
	guint8  ip6r0_type;		/* always zero */
	guint8  ip6r0_segleft;	/* segments left */
	guint8  ip6r0_reserved;	/* reserved field */
	guint8  ip6r0_slmap[3];	/* strict/loose bit map */
	struct e_in6_addr  ip6r0_addr[1];	/* up to 23 addresses */
};

/* Fragment header */
struct ip6_frag {
	guint8  ip6f_nxt;		/* next header */
	guint8  ip6f_reserved;	/* reserved field */
	guint16 ip6f_offlg;		/* offset, reserved, and flag */
	guint32 ip6f_ident;		/* identification */
};

#if BYTE_ORDER == BIG_ENDIAN
#define IP6F_OFF_MASK		0xfff8	/* mask out offset from _offlg */
#define IP6F_RESERVED_MASK	0x0006	/* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG		0x0001	/* more-fragments flag */
#else /* BYTE_ORDER == LITTLE_ENDIAN */
#define IP6F_OFF_MASK		0xf8ff	/* mask out offset from _offlg */
#define IP6F_RESERVED_MASK	0x0600	/* reserved bits in ip6f_offlg */
#define IP6F_MORE_FRAG		0x0100	/* more-fragments flag */
#endif /* BYTE_ORDER == LITTLE_ENDIAN */

/*
 * Definition for ICMPv6.
 * RFC 1885
 */

#define ICMPV6_PLD_MAXLEN	1232	/* IPV6_MMTU - sizeof(struct ip6_hdr)
					   - sizeof(struct icmp6_hdr) */

struct icmp6_hdr {
	guint8	icmp6_type;	/* type field */
	guint8	icmp6_code;	/* code field */
	guint16	icmp6_cksum;	/* checksum field */
	union {
		guint32	icmp6_un_data32[1]; /* type-specific field */
		guint16	icmp6_un_data16[2]; /* type-specific field */
		guint8	icmp6_un_data8[4];  /* type-specific field */
	} icmp6_dataun;
};

#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 */

/* xxx: actually not assigned yet */
#define ICMP6_WRUREQUEST		140	/* who are you request */
#define ICMP6_WRUREPLY			141	/* who are you reply */
#define ICMP6_FQDN_QUERY		140	/* FQDN query */
#define ICMP6_FQDN_REPLY		141	/* FQDN reply */

#define ICMP6_MAXTYPE			141

#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 */
#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_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 */

/*
 * Multicast Listener Discovery
 */
struct mld6_hdr {
	struct icmp6_hdr	mld6_hdr;
	struct e_in6_addr		mld6_addr; /* multicast address */
};

#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 */
};

#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;
	guint32		nd_ra_reachable;	/* reachable time */
	guint32		nd_ra_retransmit;	/* retransmit timer */
	/* could be followed by options */
};

#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 e_in6_addr		nd_ns_target;	/*target address */
	/* could be followed by options */
};

#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 e_in6_addr		nd_na_target;	/* target address */
	/* could be followed by options */
};

#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
#elif BYTE_ORDER == LITTLE_ENDIAN
#define ND_NA_FLAG_ROUTER		0x80
#define ND_NA_FLAG_SOLICITED		0x40
#define ND_NA_FLAG_OVERRIDE		0x20
#endif

struct nd_redirect {		/* redirect */
	struct icmp6_hdr	nd_rd_hdr;
	struct e_in6_addr		nd_rd_target;	/* target address */
	struct e_in6_addr		nd_rd_dst;	/* destination address */
	/* could be followed by options */
};

#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 */
	guint8	nd_opt_type;
	guint8	nd_opt_len;
	/* followed by option specific data*/
};

#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 */
	guint8	nd_opt_pi_type;
	guint8	nd_opt_pi_len;
	guint8	nd_opt_pi_prefix_len;
	guint8	nd_opt_pi_flags_reserved;
	guint32	nd_opt_pi_valid_time;
	guint32	nd_opt_pi_preferred_time;
	guint32	nd_opt_pi_reserved2;
	struct e_in6_addr	nd_opt_pi_prefix;
};

#define ND_OPT_PI_FLAG_ONLINK		0x80
#define ND_OPT_PI_FLAG_AUTO		0x40

struct nd_opt_rd_hdr {         /* redirected header */
	guint8	nd_opt_rh_type;
	guint8	nd_opt_rh_len;
	guint16	nd_opt_rh_reserved1;
	guint32	nd_opt_rh_reserved2;
	/* followed by IP header and data */
};

struct nd_opt_mtu {		/* MTU option */
	guint8	nd_opt_mtu_type;
	guint8	nd_opt_mtu_len;
	guint16	nd_opt_mtu_reserved;
	guint32	nd_opt_mtu_mtu;
};

#if 0
/* disregard until used. We have to decide how to handle guint64 */ 
/*
 * icmp6 namelookup
 */

struct icmp6_namelookup {
	struct icmp6_hdr 	icmp6_nl_hdr;
	guint64	icmp6_nl_nonce;
	guint32	icmp6_nl_ttl;
#if 0
	guint8	icmp6_nl_len;
	guint8	icmp6_nl_name[3];
#endif
	/* could be followed by options */
};
#endif

/*
 * Router Renumbering. as router-renum-05.txt
 */
#if BYTE_ORDER == BIG_ENDIAN /* net byte order */
struct icmp6_router_renum {	/* router renumbering header */
	struct icmp6_hdr	rr_hdr;
	guint8		rr_segnum;
	guint32		rr_test : 1;
	guint32		rr_reqresult : 1;
	guint32		rr_forceapply : 1;
	guint32		rr_specsite : 1;
	guint32		rr_prevdone : 1;
	guint32		rr_flags_reserved : 3;
	guint16		rr_maxdelay;
	guint32		rr_reserved;
};
#elif BYTE_ORDER == LITTLE_ENDIAN
struct icmp6_router_renum {	/* router renumbering header */
	struct icmp6_hdr	rr_hdr;
	guint8		rr_segnum;
	guint32		rr_flags_reserved : 3;
	guint32		rr_prevdone : 1;
	guint32		rr_specsite : 1;
	guint32		rr_forceapply : 1;
	guint32		rr_reqresult : 1;
	guint32		rr_test : 1;
	guint16		rr_maxdelay;
	guint32		rr_reserved;
};
#endif /* BYTE_ORDER */

#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 */
	guint8	rpm_code;
	guint8	rpm_len;
	guint8	rpm_ordinal;
	guint8	rpm_matchlen;
	guint8	rpm_minlen;
	guint8	rpm_maxlen;
	guint16	rpm_reserved;
	struct e_in6_addr	rpm_prefix;
};

#define RPM_PCO_ADD		1
#define RPM_PCO_CHANGE		2
#define RPM_PCO_SETGLOBAL	3
#define RPM_PCO_MAX		4

#if BYTE_ORDER == BIG_ENDIAN /* net byte order */
struct rr_pco_use {		/* use prefix part */
	guint8	rpu_uselen;
	guint8	rpu_keeplen;
	guint32	rpu_mask_onlink : 1;
	guint32	rpu_mask_autonomous : 1;
	guint32	rpu_mask_reserved : 6;
	guint32	rpu_onlink : 1;
	guint32	rpu_autonomous : 1;
	guint32	rpu_raflags_reserved : 6;
	guint32	rpu_vltime;
	guint32	rpu_pltime;
	guint32	rpu_decr_vltime : 1;
	guint32	rpu_decr_pltime : 1;
	guint32	rpu_flags_reserved : 6;
	guint32	rpu_reserved : 24;
	struct e_in6_addr rpu_prefix;
};
#elif BYTE_ORDER == LITTLE_ENDIAN
struct rr_pco_use {		/* use prefix part */
	guint8	rpu_uselen;
	guint8	rpu_keeplen;
	guint32	rpu_mask_reserved : 6;
	guint32	rpu_mask_autonomous : 1;
	guint32	rpu_mask_onlink : 1;
	guint32	rpu_raflags_reserved : 6;
	guint32	rpu_autonomous : 1;
	guint32	rpu_onlink : 1;
	guint32	rpu_vltime;
	guint32	rpu_pltime;
	guint32	rpu_flags_reserved : 6;
	guint32	rpu_decr_pltime : 1;
	guint32	rpu_decr_vltime : 1;
	guint32	rpu_reserved : 24;
	struct e_in6_addr rpu_prefix;
};
#endif /* BYTE_ORDER */

#if BYTE_ORDER == BIG_ENDIAN /* net byte order */
struct rr_result {		/* router renumbering result message */
	guint8	rrr_reserved;
	guint32	rrr_flags_reserved : 6;
	guint32	rrr_outofbound : 1;
	guint32	rrr_forbidden : 1;
	guint8	rrr_ordinal;
	guint8	rrr_matchedlen;
	guint32	rrr_ifid;
	struct e_in6_addr rrr_prefix;
};
#elif BYTE_ORDER == LITTLE_ENDIAN
struct rr_result {		/* router renumbering result message */
	guint8	rrr_reserved;
	guint32	rrr_forbidden : 1;
	guint32	rrr_outofbound : 1;
	guint32	rrr_flags_reserved : 6;
	guint8	rrr_ordinal;
	guint8	rrr_matchedlen;
	guint32	rrr_ifid;
	struct e_in6_addr rrr_prefix;
};
#endif /* BYTE_ORDER */

#endif /* __PACKET_IPV6_H_DEFINED__ */