/*
 * Copyright (C) 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.
 *
 * $FreeBSD$
 */

#define	ALLNODES "ff02::1"
#define	ALLROUTERS "ff02::2"
#define	ALLSITEROUTERS "ff05::2"
#define	ANY "::"
#define	RTSOLLEN 8

/* protocol constants and default values */
#define	DEF_MAXRTRADVINTERVAL 600
#define	DEF_ADVLINKMTU 0
#define	DEF_ADVREACHABLETIME 0
#define	DEF_ADVRETRANSTIMER 0
#define	DEF_ADVCURHOPLIMIT 64
#define	DEF_ADVVALIDLIFETIME 2592000
#define	DEF_ADVPREFERREDLIFETIME 604800

#define	MAXROUTERLIFETIME 9000
#define	MIN_MAXINTERVAL 4
#define	MAX_MAXINTERVAL 1800
#define	MIN_MININTERVAL 3
#define	MAXREACHABLETIME 3600000

#define	MAX_INITIAL_RTR_ADVERT_INTERVAL  16
#define	MAX_INITIAL_RTR_ADVERTISEMENTS    3
#define	MAX_FINAL_RTR_ADVERTISEMENTS      3
#define	MIN_DELAY_BETWEEN_RAS             3
#define	MAX_RA_DELAY_TIME                 500000 /* usec */

struct prefix {
	struct	prefix *next;	/* forward link */
	struct	prefix *prev;	/* previous link */

	u_int32_t	validlifetime; /* AdvValidLifetime */
	u_int32_t	preflifetime;	/* AdvPreferredLifetime */
	u_int	onlinkflg;	/* bool: AdvOnLinkFlag */
	u_int	autoconfflg;	/* bool: AdvAutonomousFlag */
	int	prefixlen;
	struct	in6_addr prefix;
};

struct	rainfo {
	/* pointer for list */
	struct	rainfo *next;

	/* timer related parameters */
	struct	rtadvd_timer *timer;
	int	initcounter; /* counter for the first few advertisements */
	struct	timeval lastsent; /* timestamp when the lates RA was sent */
	int	waiting;		/* number of RS waiting for RA */

	/* interface information */
	int	ifindex;
	int	advlinkopt;	/* bool: whether include link-layer addr opt */
	struct	sockaddr_dl *sdl;
	char	ifname[16];
	int	phymtu;		/* mtu of the physical interface */

	/* Router configuration variables */
	u_short	lifetime;	/* AdvDefaultLifetime */
	u_int	maxinterval;	/* MaxRtrAdvInterval */
	u_int	mininterval;	/* MinRtrAdvInterval */
	int 	managedflg;	/* AdvManagedFlag */
	int	otherflg;	/* AdvOtherConfigFlag */
	u_int32_t	linkmtu;	/* AdvLinkMTU */
	u_int32_t	reachabletime; /* AdvReachableTime */
	u_int32_t	retranstimer;	/* AdvRetransTimer */
	u_int	hoplimit;	/* AdvCurHopLimit */
	struct	prefix prefix;	/* AdvPrefixList(link head) */
	int	pfxs;		/* number of prefixes */

	/* actual RA packet data and its length */
	size_t	ra_datalen;
	u_char	*ra_data;
};

void	ra_timeout __P((void *));
void	ra_timer_update __P((void *, struct timeval *));