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#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 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/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;
	__u8		opt[0];
};
 
struct ra_msg {
        struct icmp6hdr		icmph;
	__u32			reachable_time;
	__u32			retrans_timer;
};
 
struct nd_opt_hdr {
	__u8		nd_opt_type;
	__u8		nd_opt_len;
} __attribute__((__packed__));
 
struct ndisc_options {
	struct nd_opt_hdr *nd_opt_array[7];
	struct nd_opt_hdr *nd_opt_piend;
};
 
#define nd_opts_src_lladdr	nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
#define nd_opts_tgt_lladdr	nd_opt_array[ND_OPT_TARGET_LL_ADDR]
#define nd_opts_pi		nd_opt_array[ND_OPT_PREFIX_INFO]
#define nd_opts_pi_end		nd_opt_piend
#define nd_opts_rh		nd_opt_array[ND_OPT_REDIRECT_HDR]
#define nd_opts_mtu		nd_opt_array[ND_OPT_MTU]
 
extern struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur, struct nd_opt_hdr *end);
extern struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len, struct 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);
 
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