text: /*
   * Copyright (C) 1995-2001 by Darren Reed.
   *
   * See the IPFILTER.LICENCE file for details on licencing.
   *
   * @(#)ip_state.h	1.3 1/12/96 (C) 1995 Darren Reed
   * $Id: ip_state.h,v 2.13.2.1 2000/07/08 02:15:35 darrenr Exp $
   * $FreeBSD: src/sys/contrib/ipfilter/netinet/ip_state.h,v 1.14 2002/08/28 13:41:36 darrenr Exp $
   */
  #ifndef	__IP_STATE_H__
  #define	__IP_STATE_H__
  
  #if defined(__STDC__) || defined(__GNUC__)
  # define	SIOCDELST	_IOW('r', 61, struct ipstate *)
  #else
  # define	SIOCDELST	_IOW(r, 61, struct ipstate *)
  #endif
  
  #ifndef	IPSTATE_SIZE
  # define	IPSTATE_SIZE	5737
  #endif
  #ifndef	IPSTATE_MAX
  # define	IPSTATE_MAX	4013	/* Maximum number of states held */
  #endif
  
  #define	PAIRS(s1,d1,s2,d2)	((((s1) == (s2)) && ((d1) == (d2))) ||\
  				 (((s1) == (d2)) && ((d1) == (s2))))
  #define	IPPAIR(s1,d1,s2,d2)	PAIRS((s1).s_addr, (d1).s_addr, \
  				      (s2).s_addr, (d2).s_addr)
  
  
  typedef struct udpstate {
  	u_short	us_sport;
  	u_short	us_dport;
  } udpstate_t;
  
  typedef struct icmpstate {
  	u_short	ics_id;
  	u_short	ics_seq;
  	u_char	ics_type;
  } icmpstate_t;
  
  typedef	struct	tcpdata	{
  	u_32_t	td_end;
  	u_32_t	td_maxend;
  	u_32_t	td_maxwin;
  	u_char	td_wscale;
  } tcpdata_t;
  
  typedef	struct tcpstate {
  	u_short	ts_sport;
  	u_short	ts_dport;
  	tcpdata_t ts_data[2];
  	u_char	ts_state[2];
  } tcpstate_t;
  
  typedef struct ipstate {
  	struct	ipstate	*is_next;
  	struct	ipstate	**is_pnext;
  	struct	ipstate	*is_hnext;
  	struct	ipstate	**is_phnext;
  	struct	ipstate	**is_me;
  	frentry_t	*is_rule;
  	U_QUAD_T	is_pkts;
  	U_QUAD_T	is_bytes;
  	union	i6addr	is_src;
  	union	i6addr	is_dst;
  	void	*is_ifp[4];
  	u_long	is_age;
  	u_int	is_frage[2];	/* age from filter rule, forward & reverse */
  	u_int	is_pass;
  	u_char	is_p;			/* Protocol */
  	u_char	is_v;			/* IP version */
  	u_char	is_fsm;			/* 1 = following FSM, 0 = not */
  	u_char	is_xxx;			/* pad */
  	u_int	is_hv;			/* hash value for this in the table */
  	u_32_t	is_rulen;		/* rule number */
  	u_32_t	is_flags;		/* flags for this structure */
  	u_32_t	is_opt;			/* packet options set */
  	u_32_t	is_optmsk;		/*    "      "    mask */
  	u_short	is_sec;			/* security options set */
  	u_short	is_secmsk;		/*    "        "    mask */
  	u_short	is_auth;		/* authentication options set */
  	u_short	is_authmsk;		/*    "              "    mask */
  	union {
  		icmpstate_t	is_ics;
  		tcpstate_t	is_ts;
  		udpstate_t	is_us;
  	} is_ps;
  	u_32_t	is_group;
  	char	is_ifname[4][IFNAMSIZ];
  #if SOLARIS || defined(__sgi)
  	kmutex_t	is_lock;
  #endif
  } ipstate_t;
  
  #define	is_saddr	is_src.in4.s_addr
  #define	is_daddr	is_dst.in4.s_addr
  #define	is_icmp		is_ps.is_ics
  #define	is_type		is_icmp.ics_type
  #define	is_code		is_icmp.ics_code
  #define	is_tcp		is_ps.is_ts
  #define	is_udp		is_ps.is_us
  #define is_send		is_tcp.ts_data[0].td_end
  #define is_dend		is_tcp.ts_data[1].td_end
  #define is_maxswin	is_tcp.ts_data[0].td_maxwin
  #define is_maxdwin	is_tcp.ts_data[1].td_maxwin
  #define is_swscale	is_tcp.ts_data[0].td_wscale
  #define is_dwscale	is_tcp.ts_data[1].td_wscale
  #define is_maxsend	is_tcp.ts_data[0].td_maxend
  #define is_maxdend	is_tcp.ts_data[1].td_maxend
  #define	is_sport	is_tcp.ts_sport
  #define	is_dport	is_tcp.ts_dport
  #define	is_state	is_tcp.ts_state
  #define	is_ifpin	is_ifp[0]
  #define	is_ifpout	is_ifp[2]
  
  #define	TH_OPENING	(TH_SYN|TH_ACK)
  /*
   * is_flags:
   * Bits 0 - 3 are use as a mask with the current packet's bits to check for
   * whether it is short, tcp/udp, a fragment or the presence of IP options.
   * Bits 4 - 7 are set from the initial packet and contain what the packet
   * anded with bits 0-3 must match.
   * Bits 8,9 are used to indicate wildcard source/destination port matching.
   */
  
  typedef	struct	ipstate_save	{
  	void	*ips_next;
  	struct	ipstate	ips_is;
  	struct	frentry	ips_fr;
  } ipstate_save_t;
  
  #define	ips_rule	ips_is.is_rule
  
  
  typedef	struct	ipslog	{
  	U_QUAD_T	isl_pkts;
  	U_QUAD_T	isl_bytes;
  	union	i6addr	isl_src;
  	union	i6addr	isl_dst;
  	u_short	isl_type;
  	union {
  		u_short	isl_filler[2];
  		u_short	isl_ports[2];
  		u_short	isl_icmp;
  	} isl_ps;
  	u_char	isl_v;
  	u_char	isl_p;
  	u_char	isl_flags;
  	u_char	isl_state[2];
  	u_32_t	isl_rulen;
  	u_32_t	isl_group;
  } ipslog_t;
  
  #define	isl_sport	isl_ps.isl_ports[0]
  #define	isl_dport	isl_ps.isl_ports[1]
  #define	isl_itype	isl_ps.isl_icmp
  
  #define	ISL_NEW		0
  #define	ISL_EXPIRE	0xffff
  #define	ISL_FLUSH	0xfffe
  #define	ISL_REMOVE	0xfffd
  
  
  typedef	struct	ips_stat {
  	u_long	iss_hits;
  	u_long	iss_miss;
  	u_long	iss_max;
  	u_long	iss_tcp;
  	u_long	iss_udp;
  	u_long	iss_icmp;
  	u_long	iss_nomem;
  	u_long	iss_expire;
  	u_long	iss_fin;
  	u_long	iss_active;
  	u_long	iss_logged;
  	u_long	iss_logfail;
  	u_long	iss_inuse;
  	ipstate_t **iss_table;
  	ipstate_t *iss_list;
  } ips_stat_t;
  
  
  extern	u_long	fr_tcpidletimeout;
  extern	u_long	fr_tcpclosewait;
  extern	u_long	fr_tcplastack;
  extern	u_long	fr_tcptimeout;
  extern	u_long	fr_tcpclosed;
  extern	u_long	fr_tcphalfclosed;
  extern	u_long	fr_udptimeout;
  extern	u_long	fr_udpacktimeout;
  extern	u_long	fr_icmptimeout;
  extern	u_long	fr_icmpacktimeout;
  extern	ipstate_t	*ips_list;
  extern	int	fr_state_lock;
  extern	int	fr_stateinit __P((void));
  extern	int	fr_tcpstate __P((ipstate_t *, fr_info_t *, ip_t *, tcphdr_t *));
  extern	ipstate_t *fr_addstate __P((ip_t *, fr_info_t *, ipstate_t **, u_int));
  extern	frentry_t *fr_checkstate __P((ip_t *, fr_info_t *));
  extern	void	ip_statesync __P((void *));
  extern	void	fr_timeoutstate __P((void));
  extern	int	fr_tcp_age __P((u_long *, u_char *, fr_info_t *, int, int));
  extern	void	fr_stateunload __P((void));
  extern	void	ipstate_log __P((struct ipstate *, u_int));
  #if defined(__NetBSD__) || defined(__OpenBSD__)
  extern	int	fr_state_ioctl __P((caddr_t, u_long, int));
  #else
  extern	int	fr_state_ioctl __P((caddr_t, int, int));
  #endif
  
  #endif /* __IP_STATE_H__ */
  