/*	$NetBSD: ip_frag.h,v 1.9 2012/02/15 17:55:22 riz Exp $	*/

/*
 * Copyright (C) 1993-2001 by Darren Reed.
 *
 * See the IPFILTER.LICENCE file for details on licencing.
 *
 * @(#)ip_frag.h	1.5 3/24/96
 * Id: ip_frag.h,v 2.23.2.7 2009/01/01 03:53:17 darrenr Exp
 */

#ifndef _NETINET_IP_FRAG_H_
#define _NETINET_IP_FRAG_H_

#define	IPFT_SIZE	257

typedef	struct	ipfr	{
	struct	ipfr	*ipfr_hnext, **ipfr_hprev;
	struct	ipfr	*ipfr_next, **ipfr_prev;
	void	*ipfr_data;
	frentry_t *ipfr_rule;
	u_long	ipfr_ttl;
	int	ipfr_ref;
	u_short	ipfr_off;
	u_short	ipfr_seen0;
	/*
	 * All of the fields, from ipfr_ifp to ipfr_pass, are compared
	 * using bcmp to see if an identical entry is present.  It is
	 * therefore important for this set to remain together.
	 */
	void	*ipfr_ifp;
	i6addr_t ipfr_src;
	i6addr_t ipfr_dst;
	u_32_t	ipfr_optmsk;
	u_short	ipfr_secmsk;
	u_short	ipfr_auth;
	u_32_t	ipfr_id;
	u_32_t	ipfr_p;
	u_32_t	ipfr_tos;
	u_32_t	ipfr_pass;
} ipfr_t;


typedef	struct	ipfrstat {
	u_long	ifs_exists;	/* add & already exists */
	u_long	ifs_nomem;
	u_long	ifs_new;
	u_long	ifs_hits;
	u_long	ifs_expire;
	u_long	ifs_inuse;
	u_long	ifs_retrans0;
	u_long	ifs_short;
	struct	ipfr	**ifs_table;
	struct	ipfr	**ifs_nattab;
} ipfrstat_t;

#define	IPFR_CMPSZ	(offsetof(ipfr_t, ipfr_pass) - \
			 offsetof(ipfr_t, ipfr_ifp))

extern	ipfr_t	*ipfr_list, **ipfr_tail;
extern	ipfr_t	*ipfr_natlist, **ipfr_nattail;
extern	int	ipfr_size;
extern	int	fr_ipfrttl;
extern	int	fr_frag_lock;
extern	int	fr_fraginit(void);
extern	void	fr_fragunload(void);
extern	ipfrstat_t	*fr_fragstats(void);

extern	int	fr_newfrag(fr_info_t *, u_32_t);
extern	frentry_t *fr_knownfrag(fr_info_t *, u_32_t *);

extern	int	fr_nat_newfrag(fr_info_t *, u_32_t, struct nat *);
extern	nat_t	*fr_nat_knownfrag(fr_info_t *);

extern	int	fr_ipid_newfrag(fr_info_t *, u_32_t);
extern	u_32_t	fr_ipid_knownfrag(fr_info_t *);
#ifdef USE_MUTEXES
extern	void	fr_fragderef(ipfr_t **, ipfrwlock_t *);
extern	int	fr_nextfrag(ipftoken_t *, ipfgeniter_t *, ipfr_t **, \
				 ipfr_t ***, ipfrwlock_t *);
#else
extern	void	fr_fragderef(ipfr_t **);
extern	int	fr_nextfrag(ipftoken_t *, ipfgeniter_t *, ipfr_t **, \
				 ipfr_t ***);
#endif

extern	void	fr_forget(void *);
extern	void	fr_forgetnat(void *);
extern	void	fr_fragclear(void);
extern	void	fr_fragexpire(void);

#if defined(_KERNEL) && ((defined(BSD) && (BSD >= 199306)) || SOLARIS || \
    defined(__sgi) || defined(__osf__) || (defined(__sgi) && (IRIX >= 60500)))
# if defined(SOLARIS2) && (SOLARIS2 < 7)
extern	void	fr_slowtimer(void);
# else
extern	void	fr_slowtimer(void *);
# endif
#else
# if defined(linux) && defined(_KERNEL)
extern	void	fr_slowtimer(long);
# else
extern	int	fr_slowtimer(void);
# endif
#endif

#endif /* _NETINET_IP_FRAG_H_ */