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//==========================================================================

//

//      include/netinet/ip_nat.h

//

//      

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/* $OpenBSD: ip_nat.h,v 1.13 1999/12/15 05:20:22 kjell Exp $ */

/*

 * Copyright (C) 1995-1998 by Darren Reed.

 *

 * Redistribution and use in source and binary forms are permitted

 * provided that this notice is preserved and due credit is given

 * to the original author and the contributors.

 *

 * @(#)ip_nat.h 1.5 2/4/96

 */

#ifndef _NETINET_IP_NAT_H__

#define _NETINET_IP_NAT_H__

#ifndef SOLARIS

#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))

#endif

#if defined(__STDC__) || defined(__GNUC__)

#define SIOCADNAT       _IOW('r', 80, struct ipnat)

#define SIOCRMNAT       _IOW('r', 81, struct ipnat)

#define SIOCGNATS       _IOR('r', 82, struct natstat)

#define SIOCGNATL       _IOWR('r', 83, struct natlookup)

#define SIOCGFRST       _IOR('r', 84, struct ipfrstat)

#define SIOCGIPST       _IOR('r', 85, struct ips_stat)

#define SIOCFLNAT       _IOWR('r', 86, int)

#define SIOCCNATL       _IOWR('r', 87, int)

#else

#define SIOCADNAT       _IOW(r, 80, struct ipnat)

#define SIOCRMNAT       _IOW(r, 81, struct ipnat)

#define SIOCGNATS       _IOR(r, 82, struct natstat)

#define SIOCGNATL       _IOWR(r, 83, struct natlookup)

#define SIOCGFRST       _IOR(r, 84, struct ipfrstat)

#define SIOCGIPST       _IOR(r, 85, struct ips_stat)

#define SIOCFLNAT       _IOWR(r, 86, int)

#define SIOCCNATL       _IOWR(r, 87, int)

#endif

#undef  LARGE_NAT       /* define this if you're setting up a system to NAT

                         * LARGE numbers of networks/hosts - i.e. in the

                         * hundreds or thousands.  In such a case, you should

                         * also change the RDR_SIZE and NAT_SIZE below to more

                         * appropriate sizes.  The figures below were used for

                         * a setup with 1000-2000 networks to NAT.

                         */

#define NAT_SIZE        127

#define RDR_SIZE        127

#define NAT_TABLE_SZ    127

#ifdef  LARGE_NAT

#undef  NAT_SIZE

#undef  RDR_SIZE

#undef  NAT_TABLE_SZ

#define NAT_SIZE        2047

#define RDR_SIZE        2047

#define NAT_TABLE_SZ    16383

#endif

#ifndef APR_LABELLEN

#define APR_LABELLEN    16

#endif

#define NAT_HW_CKSUM    0x80000000

#define DEF_NAT_AGE     1200     /* 10 minutes (600 seconds) */

typedef struct  nat     {

        u_long  nat_age;

        int     nat_flags;

        u_32_t  nat_sumd[2];

        u_32_t  nat_ipsumd;

        void    *nat_data;

        void    *nat_aps;               /* proxy session */

        frentry_t       *nat_fr;        /* filter rule ptr if appropriate */

        struct  in_addr nat_inip;

        struct  in_addr nat_outip;

        struct  in_addr nat_oip;        /* other ip */

        U_QUAD_T        nat_pkts;

        U_QUAD_T        nat_bytes;

        u_short nat_oport;              /* other port */

        u_short nat_inport;

        u_short nat_outport;

        u_short nat_use;

        u_char  nat_tcpstate[2];

        u_char  nat_p;                  /* protocol for NAT */

        struct  ipnat   *nat_ptr;       /* pointer back to the rule */

        struct  nat     *nat_next;

        struct  nat     *nat_hnext[2];

        struct  nat     **nat_hstart[2];

        void    *nat_ifp;

        int     nat_dir;

} nat_t;

typedef struct  ipnat   {

        struct  ipnat   *in_next;

        struct  ipnat   *in_rnext;

        struct  ipnat   *in_mnext;

        void    *in_ifp;

        void    *in_apr;

        u_long  in_space;

        u_int   in_use;

        u_int   in_hits;

        struct  in_addr in_nextip;

        u_short in_pnext;

        u_short in_ppip;        /* ports per IP */

        u_short in_ippip;       /* IP #'s per IP# */

        u_short in_flags;       /* From here to in_dport must be reflected */

        u_short in_port[2];     /* correctly in IPN_CMPSIZ */

        struct  in_addr in_in[2];

        struct  in_addr in_out[2];

        struct  in_addr in_src[2];

        int     in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */

        char    in_ifname[IFNAMSIZ];

        char    in_plabel[APR_LABELLEN];        /* proxy label */

        char    in_p;   /* protocol */

        u_short in_dport;

} ipnat_t;

#define in_pmin         in_port[0]      /* Also holds static redir port */

#define in_pmax         in_port[1]

#define in_nip          in_nextip.s_addr

#define in_inip         in_in[0].s_addr

#define in_inmsk        in_in[1].s_addr

#define in_outip        in_out[0].s_addr

#define in_outmsk       in_out[1].s_addr

#define in_srcip        in_src[0].s_addr

#define in_srcmsk       in_src[1].s_addr

#define NAT_OUTBOUND    0

#define NAT_INBOUND     1

#define NAT_MAP         0x01

#define NAT_REDIRECT    0x02

#define NAT_BIMAP       (NAT_MAP|NAT_REDIRECT)

#define NAT_MAPBLK      0x04

#define MAPBLK_MINPORT  1024    /* don't use reserved ports for src port */

#define USABLE_PORTS    (65536 - MAPBLK_MINPORT)

#define IPN_CMPSIZ      (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))

typedef struct  natlookup {

        struct  in_addr nl_inip;

        struct  in_addr nl_outip;

        struct  in_addr nl_realip;

        int     nl_flags;

        u_short nl_inport;

        u_short nl_outport;

        u_short nl_realport;

} natlookup_t;

typedef struct  natstat {

        u_long  ns_mapped[2];

        u_long  ns_rules;

        u_long  ns_added;

        u_long  ns_expire;

        u_long  ns_inuse;

        u_long  ns_logged;

        u_long  ns_logfail;

        nat_t   **ns_table[2];

        ipnat_t *ns_list;

        void    *ns_apslist;

        u_int   ns_nattab_sz;

        u_int   ns_rultab_sz;

        u_int   ns_rdrtab_sz;

        nat_t   *ns_instances;

} natstat_t;

#define IPN_ANY         0x00

#define IPN_TCP         0x01

#define IPN_UDP         0x02

#define IPN_TCPUDP      (IPN_TCP|IPN_UDP)

#define IPN_DELETE      0x04

#define IPN_ICMPERR     0x08

#define IPN_RF          (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)

#define IPN_AUTOPORTMAP 0x10

#define IPN_RANGE       0x20

#define IPN_USERFLAGS   (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_RANGE)

typedef struct  natlog {

        struct  in_addr nl_origip;

        struct  in_addr nl_outip;

        struct  in_addr nl_inip;

        u_short nl_origport;

        u_short nl_outport;

        u_short nl_inport;

        u_short nl_type;

        int     nl_rule;

        U_QUAD_T        nl_pkts;

        U_QUAD_T        nl_bytes;

} natlog_t;

#define NL_NEWMAP       NAT_MAP

#define NL_NEWRDR       NAT_REDIRECT

#define NL_EXPIRE       0xffff

#define NAT_HASH_FN(k,m)        (((k) + ((k) >> 12)) % (m))

#define LONG_SUM(in)    (((in) & 0xffff) + ((in) >> 16))

#define CALC_SUMD(s1, s2, sd) { \

                            (s1) = ((s1) & 0xffff) + ((s1) >> 16); \

                            (s2) = ((s2) & 0xffff) + ((s2) >> 16); \

                            /* Do it twice */ \

                            (s1) = ((s1) & 0xffff) + ((s1) >> 16); \

                            (s2) = ((s2) & 0xffff) + ((s2) >> 16); \

                            /* Because ~1 == -2, We really need ~1 == -1 */ \

                            if ((s1) > (s2)) (s2)--; \

                            (sd) = (s2) - (s1); \

                            (sd) = ((sd) & 0xffff) + ((sd) >> 16); }

extern  u_int   ipf_nattable_sz;

extern  u_int   ipf_natrules_sz;

extern  u_int   ipf_rdrrules_sz;

extern  void    ip_natsync __P((void *));

extern  u_long  fr_defnatage;

extern  u_long  fr_defnaticmpage;

extern  nat_t   **nat_table[2];

extern  nat_t   *nat_instances;

extern  ipnat_t **nat_rules;

extern  ipnat_t **rdr_rules;

extern  natstat_t       nat_stats;

#if defined(__NetBSD__) || defined(__OpenBSD__)

extern  int     nat_ioctl __P((caddr_t, u_long, int));

#else

extern  int     nat_ioctl __P((caddr_t, int, int));

#endif

extern  void    nat_ifdetach __P((struct ifnet *));

extern  int     nat_init __P((void));

extern  nat_t   *nat_new __P((ipnat_t *, ip_t *, fr_info_t *, u_int, int));

extern  nat_t   *nat_outlookup __P((void *, u_int, u_int, struct in_addr,

                                 struct in_addr, u_32_t));

extern  nat_t   *nat_inlookup __P((void *, u_int, u_int, struct in_addr,

                                struct in_addr, u_32_t));

extern  nat_t   *nat_maplookup __P((void *, u_int, struct in_addr,

                                struct in_addr));

extern  nat_t   *nat_lookupredir __P((natlookup_t *));

extern  nat_t   *nat_icmpinlookup __P((ip_t *, fr_info_t *));

extern  nat_t   *nat_icmpin __P((ip_t *, fr_info_t *, u_int *));

extern  int     ip_natout __P((ip_t *, fr_info_t *));

extern  int     ip_natin __P((ip_t *, fr_info_t *));

extern  void    ip_natunload __P((void)), ip_natexpire __P((void));

extern  void    nat_log __P((struct nat *, u_int));

extern  void    fix_incksum __P((u_short *, u_32_t, int));

extern  void    fix_outcksum __P((u_short *, u_32_t, int));

#endif /* _NETINET_IP_NAT_H__ */