/* $USAGI: ndisc.h,v 1.13 2001/11/08 13:25:06 yoshfuji Exp $ */

#ifndef _NDISC_H
#define _NDISC_H

/*
 *	ICMP codes for neighbour discovery messages
 */

#define NDISC_ROUTER_SOLICITATION	133
#define NDISC_ROUTER_ADVERTISEMENT	134
#define NDISC_NEIGHBOUR_SOLICITATION	135
#define NDISC_NEIGHBOUR_ADVERTISEMENT	136
#define NDISC_REDIRECT			137

/*
 *	ndisc options
 */

#define ND_OPT_SOURCE_LL_ADDR		1
#define ND_OPT_TARGET_LL_ADDR		2
#define ND_OPT_PREFIX_INFO		3
#define ND_OPT_REDIRECT_HDR		4
#define ND_OPT_MTU			5
#define ND_OPT_RTR_ADV_INTERVAL		7	/* Mobile IPv6 */
#define ND_OPT_HOME_AGENT_INFO		8	/* Mobile IPv6 */

#define MAX_RTR_SOLICITATION_DELAY	HZ

#define ND_REACHABLE_TIME		(30*HZ)
#define ND_RETRANS_TIMER		HZ

#define ND_MIN_RANDOM_FACTOR		(1/2)
#define ND_MAX_RANDOM_FACTOR		(3/2)

#ifdef __KERNEL__

#include <linux/config.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
#include <net/neighbour.h>
#include <asm/atomic.h>

extern struct neigh_table nd_tbl;

struct nd_msg {
        struct icmp6hdr	icmph;
        struct in6_addr	target;
};

struct ra_msg {
        struct icmp6hdr		icmph;
	__u32			reachable_time;
	__u32			retrans_timer;
};

struct rd_msg {
	struct icmp6hdr 	icmph;
	struct in6_addr		rd_target;
	struct in6_addr		rd_dst;
};

struct nd_opt_hdr {
	__u8			nd_opt_type;
	__u8			nd_opt_len;
} __attribute__((__packed__));

union ndisc_options {
	struct nd_opt_hdr *nd_opt_array[9];	/*max = home agent info*/
	struct {
		struct nd_opt_hdr *__zero;
		struct nd_opt_hdr *src_lladdr;		/* 1 */
		struct nd_opt_hdr *tgt_lladdr;		/* 2 */
		struct nd_opt_hdr *pi_beg;		/* 3 */
		struct nd_opt_hdr *rh;			/* 4 */
		struct nd_opt_hdr *mtu;			/* 5 */
		struct nd_opt_hdr *__six;
		struct nd_opt_hdr *adv;			/* 7 */
		struct nd_opt_hdr *hai;			/* 8 */
		struct nd_opt_hdr *pi_end;
	} nd_opt_each;
};
#define nd_opts_src_lladdr	nd_opt_each.src_lladdr
#define nd_opts_tgt_lladdr	nd_opt_each.tgt_lladdr
#define nd_opts_pi		nd_opt_each.pi_beg
#define nd_opts_pi_end		nd_opt_each.pi_end
#define nd_opts_rh		nd_opt_each.rh
#define nd_opts_mtu		nd_opt_each.mtu
#define nd_opts_adv		nd_opt_each.adv
#define nd_opts_hai		nd_opt_each.hai

extern struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, struct nd_opt_hdr *end);
extern union ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, union ndisc_options *ndopts);

extern int			ndisc_init(struct net_proto_family *ops);

extern void			ndisc_cleanup(void);

extern int			ndisc_rcv(struct sk_buff *skb);

extern void			ndisc_send_ns(struct net_device *dev,
					      struct neighbour *neigh,
					      struct in6_addr *solicit,
					      struct in6_addr *daddr,
					      struct in6_addr *saddr,
					      int dad);

extern void			ndisc_send_na(struct net_device *dev,
					      struct neighbour *neigh,
					      struct in6_addr *daddr,
					      struct in6_addr *solicited_addr,
					      int router,
					      int solicited,
					      int overide,
					      int inc_opt);

extern void			ndisc_send_rs(struct net_device *dev,
					      struct in6_addr *saddr,
					      struct in6_addr *daddr);

extern void			ndisc_forwarding_on(void);
extern void			ndisc_forwarding_off(void);

extern void			ndisc_send_redirect(struct sk_buff *skb,
						    struct neighbour *neigh,
						    struct in6_addr *target);

extern int			ndisc_mc_map(struct in6_addr *addr, char *buf, struct net_device *dev, int dir);


struct rt6_info *		dflt_rt_lookup(void);

/*
 *	IGMP
 */
extern int			igmp6_init(struct net_proto_family *ops);

extern void			igmp6_cleanup(void);

extern int			igmp6_event_query(struct sk_buff *skb);

extern int			igmp6_event_report(struct sk_buff *skb);

extern void			igmp6_cleanup(void);

static inline struct neighbour * ndisc_get_neigh(struct net_device *dev, struct in6_addr *addr)
{

	if (dev)
		return __neigh_lookup(&nd_tbl, addr, dev, 1);

	return NULL;
}


#endif /* __KERNEL__ */


#endif
