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/*!\file netinet6/nd6.h

 * IPv6 Neighbor Discovery.

 */

/*      $FreeBSD: src/sys/netinet6/nd6.h,v 1.10 2002/04/19 04:46:23 suz Exp $   */

/*	$KAME: nd6.h,v 1.76 2001/12/18 02:10:31 itojun Exp $	*/

/*

 * Copyright (C) 1995, 1996, 1997, and 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.

 */

#ifndef _NETINET6_ND6_H_

#define _NETINET6_ND6_H_

/* see net/route.h, or net/if_inarp.h */

#ifndef RTF_ANNOUNCE

#define RTF_ANNOUNCE	RTF_PROTO2

#endif

#include <sys/queue.h>

#include <sys/callout.h>

struct	llinfo_nd6 {

	struct	llinfo_nd6 *ln_next;

	struct	llinfo_nd6 *ln_prev;

	struct	rtentry *ln_rt;

	struct	mbuf *ln_hold;	/* last packet until resolved/timeout */

	long	ln_asked;	/* number of queries already sent for this addr */

	u_long	ln_expire;	/* lifetime for NDP state transition */

	short	ln_state;	/* reachability state */

	short	ln_router;	/* 2^0: ND6 router bit */

	int	ln_byhint;	/* # of times we made it reachable by UL hint */

};

#define ND6_LLINFO_NOSTATE	-2

/*

 * We don't need the WAITDELETE state any more, but we keep the definition

 * in a comment line instead of removing it. This is necessary to avoid

 * unintentionally reusing the value for another purpose, which might

 * affect backward compatibility with old applications.

 * (20000711 jinmei@kame.net)

 */

/* #define ND6_LLINFO_WAITDELETE	-1 */

#define ND6_LLINFO_INCOMPLETE	0

#define ND6_LLINFO_REACHABLE	1

#define ND6_LLINFO_STALE	2

#define ND6_LLINFO_DELAY	3

#define ND6_LLINFO_PROBE	4

#define ND6_IS_LLINFO_PROBREACH(n) ((n)->ln_state > ND6_LLINFO_INCOMPLETE)

struct nd_ifinfo {

	u_int32_t linkmtu;		/* LinkMTU */

	u_int32_t maxmtu;		/* Upper bound of LinkMTU */

	u_int32_t basereachable;	/* BaseReachableTime */

	u_int32_t reachable;		/* Reachable Time */

	u_int32_t retrans;		/* Retrans Timer */

	u_int32_t flags;		/* Flags */

	int recalctm;			/* BaseReacable re-calculation timer */

	u_int8_t chlim;			/* CurHopLimit */

	u_int8_t receivedra;

	/* the following 3 members are for privacy extension for addrconf */

	u_int8_t randomseed0[8]; /* upper 64 bits of MD5 digest */

	u_int8_t randomseed1[8]; /* lower 64 bits (usually the EUI64 IFID) */

	u_int8_t randomid[8];	/* current random ID */

};

#define ND6_IFF_PERFORMNUD	0x1

struct in6_nbrinfo {

	char ifname[IFNAMSIZ];	/* if name, e.g. "en0" */

	struct in6_addr addr;	/* IPv6 address of the neighbor */

	long	asked;		/* number of queries already sent for this addr */

	int	isrouter;	/* if it acts as a router */

	int	state;		/* reachability state */

	int	expire;		/* lifetime for NDP state transition */

};

#define DRLSTSIZ 10

#define PRLSTSIZ 10

struct	in6_drlist {

	char ifname[IFNAMSIZ];

	struct {

		struct	in6_addr rtaddr;

		u_char	flags;

		u_short	rtlifetime;

		u_long	expire;

		u_short if_index;

	} defrouter[DRLSTSIZ];

};

struct	in6_defrouter {

	struct	sockaddr_in6 rtaddr;

	u_char	flags;

	u_short	rtlifetime;

	u_long	expire;

	u_short if_index;

};

struct	in6_prlist {

	char ifname[IFNAMSIZ];

	struct {

		struct	in6_addr prefix;

		struct prf_ra raflags;

		u_char	prefixlen;

		u_char	origin;

		u_int32_t vltime;

		u_int32_t pltime;

		time_t expire;

		u_short if_index;

		u_short advrtrs; /* number of advertisement routers */

		struct	in6_addr advrtr[DRLSTSIZ]; /* XXX: explicit limit */

	} prefix[PRLSTSIZ];

};

struct in6_prefix {

	struct	sockaddr_in6 prefix;

	struct prf_ra raflags;

	u_char	prefixlen;

	u_char	origin;

	u_long	vltime;

	u_long	pltime;

	u_long	expire;

	u_int32_t flags;

	int refcnt;

	u_short if_index;

	u_short advrtrs; /* number of advertisement routers */

	/* struct sockaddr_in6 advrtr[] */

};

#ifdef _KERNEL

struct	in6_ondireq {

	char ifname[IFNAMSIZ];

	struct {

		u_int32_t linkmtu;	/* LinkMTU */

		u_int32_t maxmtu;	/* Upper bound of LinkMTU */

		u_int32_t basereachable; /* BaseReachableTime */

		u_int32_t reachable;	/* Reachable Time */

		u_int32_t retrans;	/* Retrans Timer */

		u_int32_t flags;	/* Flags */

		int recalctm;		/* BaseReacable re-calculation timer */

		u_int8_t chlim;		/* CurHopLimit */

		u_int8_t receivedra;

	} ndi;

};

#endif

struct	in6_ndireq {

	char ifname[IFNAMSIZ];

	struct nd_ifinfo ndi;

};

struct	in6_ndifreq {

	char ifname[IFNAMSIZ];

	u_long ifindex;

};

/* Prefix status */

#define NDPRF_ONLINK		0x1

#define NDPRF_DETACHED		0x2

/* protocol constants */

#define MAX_RTR_SOLICITATION_DELAY	1	/* 1sec */

#define RTR_SOLICITATION_INTERVAL	4	/* 4sec */

#define MAX_RTR_SOLICITATIONS		3

#define ND6_INFINITE_LIFETIME		0xffffffff

#ifdef _KERNEL

/* node constants */

#define MAX_REACHABLE_TIME		3600000	/* msec */

#define REACHABLE_TIME			30000	/* msec */

#define RETRANS_TIMER			1000	/* msec */

#define MIN_RANDOM_FACTOR		512	/* 1024 * 0.5 */

#define MAX_RANDOM_FACTOR		1536	/* 1024 * 1.5 */

#define DEF_TEMP_VALID_LIFETIME		604800	/* 1 week */

#define DEF_TEMP_PREFERRED_LIFETIME	86400	/* 1 day */

#define TEMPADDR_REGEN_ADVANCE		5	/* sec */

#define MAX_TEMP_DESYNC_FACTOR		600	/* 10 min */

#define ND_COMPUTE_RTIME(x) \

		(((MIN_RANDOM_FACTOR * (x >> 10)) + (random() & \

		((MAX_RANDOM_FACTOR - MIN_RANDOM_FACTOR) * (x >> 10)))) /1000)

TAILQ_HEAD(nd_drhead, nd_defrouter);

struct	nd_defrouter {

	TAILQ_ENTRY(nd_defrouter) dr_entry;

	struct	in6_addr rtaddr;

	u_char	flags;		/* flags on RA message */

	u_short	rtlifetime;

	u_long	expire;

	u_long	advint;		/* Mobile IPv6 addition (milliseconds) */

	u_long	advint_expire;	/* Mobile IPv6 addition */

	int	advints_lost;	/* Mobile IPv6 addition */

	struct  ifnet *ifp;

};

struct nd_prefix {

	struct ifnet *ndpr_ifp;

	LIST_ENTRY(nd_prefix) ndpr_entry;

	struct sockaddr_in6 ndpr_prefix;	/* prefix */

	struct in6_addr ndpr_mask; /* netmask derived from the prefix */

	struct in6_addr ndpr_addr; /* address that is derived from the prefix */

	u_int32_t ndpr_vltime;	/* advertised valid lifetime */

	u_int32_t ndpr_pltime;	/* advertised preferred lifetime */

	time_t ndpr_expire;	/* expiration time of the prefix */

	time_t ndpr_preferred;	/* preferred time of the prefix */

	struct prf_ra ndpr_flags;

	u_int32_t ndpr_stateflags; /* actual state flags */

	/* list of routers that advertise the prefix: */

	LIST_HEAD(pr_rtrhead, nd_pfxrouter) ndpr_advrtrs;

	u_char	ndpr_plen;

	int	ndpr_refcnt;	/* reference couter from addresses */

};

#define ndpr_next		ndpr_entry.le_next

#define ndpr_raf		ndpr_flags

#define ndpr_raf_onlink		ndpr_flags.onlink

#define ndpr_raf_auto		ndpr_flags.autonomous

/*

 * We keep expired prefix for certain amount of time, for validation purposes.

 * 1800s = MaxRtrAdvInterval

 */

#define NDPR_KEEP_EXPIRED	(1800 * 2)

/*

 * Message format for use in obtaining information about prefixes

 * from inet6 sysctl function

 */

struct inet6_ndpr_msghdr {

	u_short	inpm_msglen;	/* to skip over non-understood messages */

	u_char	inpm_version;	/* future binary compatibility */

	u_char	inpm_type;	/* message type */

	struct in6_addr inpm_prefix;

	u_long	prm_vltim;

	u_long	prm_pltime;

	u_long	prm_expire;

	u_long	prm_preferred;

	struct in6_prflags prm_flags;

	u_short	prm_index;	/* index for associated ifp */

	u_char	prm_plen;	/* length of prefix in bits */

};

#define prm_raf_onlink		prm_flags.prf_ra.onlink

#define prm_raf_auto		prm_flags.prf_ra.autonomous

#define prm_statef_onlink	prm_flags.prf_state.onlink

#define prm_rrf_decrvalid	prm_flags.prf_rr.decrvalid

#define prm_rrf_decrprefd	prm_flags.prf_rr.decrprefd

#define ifpr2ndpr(ifpr)	((struct nd_prefix *)(ifpr))

#define ndpr2ifpr(ndpr)	((struct ifprefix *)(ndpr))

struct nd_pfxrouter {

	LIST_ENTRY(nd_pfxrouter) pfr_entry;

#define pfr_next pfr_entry.le_next

	struct nd_defrouter *router;

};

LIST_HEAD(nd_prhead, nd_prefix);

/* nd6.c */

extern int nd6_prune;

extern int nd6_delay;

extern int nd6_umaxtries;

extern int nd6_mmaxtries;

extern int nd6_useloopback;

extern int nd6_maxnudhint;

extern int nd6_gctimer;

extern struct llinfo_nd6 llinfo_nd6;

extern struct nd_ifinfo *nd_ifinfo;

extern struct nd_drhead nd_defrouter;

extern struct nd_prhead nd_prefix;

extern int nd6_debug;

#define nd6log(x)	do { if (nd6_debug) log x; } while (0)

extern struct callout nd6_timer_ch;

/* nd6_rtr.c */

extern int nd6_defifindex;

extern int ip6_desync_factor;	/* seconds */

extern u_int32_t ip6_temp_preferred_lifetime; /* seconds */

extern u_int32_t ip6_temp_valid_lifetime; /* seconds */

extern int ip6_temp_regen_advance; /* seconds */

union nd_opts {

	struct nd_opt_hdr *nd_opt_array[9];	/* max = home agent info */

	struct {

		struct nd_opt_hdr *zero;

		struct nd_opt_hdr *src_lladdr;

		struct nd_opt_hdr *tgt_lladdr;

		struct nd_opt_prefix_info *pi_beg; /* multiple opts, start */

		struct nd_opt_rd_hdr *rh;

		struct nd_opt_mtu *mtu;

		struct nd_opt_hdr *six;

		struct nd_opt_advint *adv;

		struct nd_opt_hai *hai;

		struct nd_opt_hdr *search;	/* multiple opts */

		struct nd_opt_hdr *last;	/* multiple opts */

		int done;

		struct nd_opt_prefix_info *pi_end;/* multiple opts, 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

#define nd_opts_search		nd_opt_each.search

#define nd_opts_last		nd_opt_each.last

#define nd_opts_done		nd_opt_each.done

/* XXX: need nd6_var.h?? */

/* nd6.c */

void nd6_init __P((void));

void nd6_ifattach __P((struct ifnet *));

int nd6_is_addr_neighbor __P((struct sockaddr_in6 *, struct ifnet *));

void nd6_option_init __P((void *, int, union nd_opts *));

struct nd_opt_hdr *nd6_option __P((union nd_opts *));

int nd6_options __P((union nd_opts *));

struct	rtentry *nd6_lookup __P((struct in6_addr *, int, struct ifnet *));

void nd6_setmtu __P((struct ifnet *));

void nd6_timer __P((void *));

void nd6_purge __P((struct ifnet *));

struct llinfo_nd6 *nd6_free __P((struct rtentry *));

void nd6_nud_hint __P((struct rtentry *, struct in6_addr *, int));

int nd6_resolve __P((struct ifnet *, struct rtentry *,

		     struct mbuf *, struct sockaddr *, u_char *));

void nd6_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *));

int nd6_ioctl __P((u_long, caddr_t, struct ifnet *));

struct rtentry *nd6_cache_lladdr __P((struct ifnet *, struct in6_addr *,

	char *, int, int, int));

int nd6_output __P((struct ifnet *, struct ifnet *, struct mbuf *,

		    struct sockaddr_in6 *, struct rtentry *));

int nd6_storelladdr __P((struct ifnet *, struct rtentry *, struct mbuf *,

			 struct sockaddr *, u_char *));

int nd6_need_cache __P((struct ifnet *));

/* nd6_nbr.c */

void nd6_na_input __P((struct mbuf *, int, int));

void nd6_na_output __P((struct ifnet *, const struct in6_addr *,

	const struct in6_addr *, u_long, int, struct sockaddr *));

void nd6_ns_input __P((struct mbuf *, int, int));

void nd6_ns_output __P((struct ifnet *, const struct in6_addr *,

	const struct in6_addr *, struct llinfo_nd6 *, int));

caddr_t nd6_ifptomac __P((struct ifnet *));

void nd6_dad_start __P((struct ifaddr *, int *));

void nd6_dad_stop __P((struct ifaddr *));

void nd6_dad_duplicated __P((struct ifaddr *));

/* nd6_rtr.c */

void nd6_rs_input __P((struct mbuf *, int, int));

void nd6_ra_input __P((struct mbuf *, int, int));

void prelist_del __P((struct nd_prefix *));

void defrouter_addreq __P((struct nd_defrouter *));

void defrouter_delreq __P((struct nd_defrouter *, int));

void defrouter_select __P((void));

void defrtrlist_del __P((struct nd_defrouter *));

void prelist_remove __P((struct nd_prefix *));

int prelist_update __P((struct nd_prefix *, struct nd_defrouter *,

			struct mbuf *));

int nd6_prelist_add __P((struct nd_prefix *, struct nd_defrouter *,

			 struct nd_prefix **));

int nd6_prefix_onlink __P((struct nd_prefix *));

int nd6_prefix_offlink __P((struct nd_prefix *));

void pfxlist_onlink_check __P((void));

struct nd_defrouter *defrouter_lookup __P((struct in6_addr *,

					   struct ifnet *));

struct nd_prefix *nd6_prefix_lookup __P((struct nd_prefix *));

int in6_init_prefix_ltimes __P((struct nd_prefix *ndpr));

void rt6_flush __P((struct in6_addr *, struct ifnet *));

int nd6_setdefaultiface __P((int));

int in6_tmpifadd __P((const struct in6_ifaddr *, int));

#endif /* _KERNEL */

#endif /* _NETINET6_ND6_H_ */