#ifndef _NETINET_IP6_OPTS_H_
#define _NETINET_IP6_OPTS_H_

#ifndef _SYS_TYPES_H_
#include <sys/types.h>
#endif

#ifndef _NETINET_IN_H_
#include <netinet/in.h>
#endif

/*
 * Definition of IPv6 options and extensions for Neighbor Discovery
 */
#define OPT6_PAD_0		0	/* Single Pad */
#define OPT6_PAD_N		1	/* Multiple Pad */
#define OPT6_JUMBO		194	/* Jumbo-Payload */

#define NDX6_LLADDR_SRC		1	/* Source Link-layer Address */
#define NDX6_LLADDR_TGT		2	/* Target Link-layer Address */
#define NDX6_PREF_INFO		3	/* Prefix-Information */
#define NDX6_RDRT_HDR		4	/* Redirected-Header */
#define NDX6_MTU		5	/* Maximum-Transmit-Unit */

/*
 * Macros on type bits.
 */
#define	OPT6_ACTION(t)		((t)&0xc0)	/* action */
#define OPT6_A_SKIP		0x00		/* skip over */
#define OPT6_A_DISC		0x40		/* discard */
#define OPT6_A_FERR		0x80		/* already send error */
#define OPT6_A_OERR		0xc0		/* send error */
#define OPT6_RTCHANGE(t)	((t)&0x20)	/* change en-route */

/*
 * Options and Extensions layouts.
 */

struct opt6_any {			/* common header */
	u_int8_t	o6any_ext;	/* extension type */
	u_int8_t	o6any_len;	/* length */
};

struct opt6_jbo {			/* Jumbo-Payload */
	u_int16_t	jbo_pad;	/* for alignment */
	u_int8_t	jbo_ext;	/* extension type (194) */
	u_int8_t	jbo_len;	/* length (4) */
	u_int32_t	jbo_plen;	/* payload length */
};

struct opt6_ra {			/* Router-Alert */
	u_int8_t	ra_ext;		/* extension type (TBD) */
	u_int8_t	ra_len;		/* length (2) */
	u_int16_t	ra_code;	/* code */
};
#define OPT6_RA_GROUP	0		/* ICMPv6 Group Membership */
#define OPT6_RA_RSVP	1		/* RSVP */

struct ndx6_any {			/* common header */
	u_int8_t	x6any_ext;	/* extension type */
	u_int8_t	x6any_len;	/* length */
	u_int16_t	x6any_res1;	/* reserved */
	u_int32_t	x6any_res2;	/* reserved */
};

struct ndx6_lladdr {			/* Link-layer Address */
	u_int8_t	lla_ext;	/* extension type (1 or 2) */
	u_int8_t	lla_len;	/* length (>=1) */
	u_int8_t	lla_addr[6];	/* media address */
};

struct ndx6_pref {			/* Prefix-Information */
	u_int8_t	pref_ext;	/* extension type (3) */
	u_int8_t	pref_len;	/* length (4) */
	u_int8_t	pref_plen;	/* prefix size (0..128) */
	u_int8_t	pref_flg;	/* flags */
	u_int32_t	pref_ilife;	/* invalidation lifetime */
	u_int32_t	pref_dlife;	/* deprecation lifetime */
	u_int32_t	pref_res2;
	struct in6_addr	pref_pref;	/* prefix */
};
#define	NDX6_PREF_FLG_L	0x80		/* On-link flag */
#define	NDX6_PREF_FLG_A	0x40		/* Address-configuration flag */

struct ndx6_mtu {			/* Maximum-Transmit-Unit */
	u_int8_t	mtu_ext;	/* extension type (5) */
	u_int8_t	mtu_len;	/* length (1) */
	u_int16_t	mtu_res;	/* reserved (0) */
	u_int32_t	mtu_mtu;	/* MTU value */
};

#endif