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/* $FreeBSD: release/9.1.0/sys/contrib/ipfilter/netinet/ip_nat.h 180778 2008-07-24 12:35:05Z darrenr $ */
/*
* Copyright (C) 1995-2001, 2003 by Darren Reed.
*
* See the IPFILTER.LICENCE file for details on licencing.
*
* @(#)ip_nat.h 1.5 2/4/96
* $FreeBSD: release/9.1.0/sys/contrib/ipfilter/netinet/ip_nat.h 180778 2008-07-24 12:35:05Z darrenr $
* Id: ip_nat.h,v 2.90.2.20 2007/09/25 08:27:32 darrenr Exp $
*/
#ifndef __IP_NAT_H__
#define __IP_NAT_H__
#ifndef SOLARIS
#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
#endif
#if defined(__STDC__) || defined(__GNUC__) || defined(_AIX51)
#define SIOCADNAT _IOW('r', 60, struct ipfobj)
#define SIOCRMNAT _IOW('r', 61, struct ipfobj)
#define SIOCGNATS _IOWR('r', 62, struct ipfobj)
#define SIOCGNATL _IOWR('r', 63, struct ipfobj)
#else
#define SIOCADNAT _IOW(r, 60, struct ipfobj)
#define SIOCRMNAT _IOW(r, 61, struct ipfobj)
#define SIOCGNATS _IOWR(r, 62, struct ipfobj)
#define SIOCGNATL _IOWR(r, 63, struct ipfobj)
#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.
*/
#ifndef NAT_SIZE
# ifdef LARGE_NAT
# define NAT_SIZE 2047
# else
# define NAT_SIZE 127
# endif
#endif
#ifndef RDR_SIZE
# ifdef LARGE_NAT
# define RDR_SIZE 2047
# else
# define RDR_SIZE 127
# endif
#endif
#ifndef HOSTMAP_SIZE
# ifdef LARGE_NAT
# define HOSTMAP_SIZE 8191
# else
# define HOSTMAP_SIZE 2047
# endif
#endif
#ifndef NAT_TABLE_MAX
/*
* This is newly introduced and for the sake of "least surprise", the numbers
* present aren't what we'd normally use for creating a proper hash table.
*/
# ifdef LARGE_NAT
# define NAT_TABLE_MAX 180000
# else
# define NAT_TABLE_MAX 30000
# endif
#endif
#ifndef NAT_TABLE_SZ
# ifdef LARGE_NAT
# define NAT_TABLE_SZ 16383
# else
# define NAT_TABLE_SZ 2047
# endif
#endif
#ifndef APR_LABELLEN
#define APR_LABELLEN 16
#endif
#define NAT_HW_CKSUM 0x80000000
#define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */
struct ipstate;
struct ap_session;
typedef struct nat {
ipfmutex_t nat_lock;
struct nat *nat_next;
struct nat **nat_pnext;
struct nat *nat_hnext[2];
struct nat **nat_phnext[2];
struct hostmap *nat_hm;
void *nat_data;
struct nat **nat_me;
struct ipstate *nat_state;
struct ap_session *nat_aps; /* proxy session */
frentry_t *nat_fr; /* filter rule ptr if appropriate */
struct ipnat *nat_ptr; /* pointer back to the rule */
void *nat_ifps[2];
void *nat_sync;
ipftqent_t nat_tqe;
u_32_t nat_flags;
u_32_t nat_sumd[2]; /* ip checksum delta for data segment*/
u_32_t nat_ipsumd; /* ip checksum delta for ip header */
u_32_t nat_mssclamp; /* if != zero clamp MSS to this */
i6addr_t nat_inip6;
i6addr_t nat_outip6;
i6addr_t nat_oip6; /* other ip */
U_QUAD_T nat_pkts[2];
U_QUAD_T nat_bytes[2];
union {
udpinfo_t nat_unu;
tcpinfo_t nat_unt;
icmpinfo_t nat_uni;
greinfo_t nat_ugre;
} nat_un;
u_short nat_oport; /* other port */
u_short nat_use;
u_char nat_p; /* protocol for NAT */
int nat_dir;
int nat_ref; /* reference count */
int nat_hv[2];
char nat_ifnames[2][LIFNAMSIZ];
int nat_rev; /* 0 = forward, 1 = reverse */
int nat_redir; /* copy of in_redir */
u_32_t nat_seqnext[2];
} nat_t;
#define nat_inip nat_inip6.in4
#define nat_outip nat_outip6.in4
#define nat_oip nat_oip6.in4
#define nat_age nat_tqe.tqe_die
#define nat_inport nat_un.nat_unt.ts_sport
#define nat_outport nat_un.nat_unt.ts_dport
#define nat_type nat_un.nat_uni.ici_type
#define nat_seq nat_un.nat_uni.ici_seq
#define nat_id nat_un.nat_uni.ici_id
#define nat_tcpstate nat_tqe.tqe_state
#define nat_die nat_tqe.tqe_die
#define nat_touched nat_tqe.tqe_touched
/*
* Values for nat_dir
*/
#define NAT_INBOUND 0
#define NAT_OUTBOUND 1
/*
* Definitions for nat_flags
*/
#define NAT_TCP 0x0001 /* IPN_TCP */
#define NAT_UDP 0x0002 /* IPN_UDP */
#define NAT_ICMPERR 0x0004 /* IPN_ICMPERR */
#define NAT_ICMPQUERY 0x0008 /* IPN_ICMPQUERY */
#define NAT_SEARCH 0x0010
#define NAT_SLAVE 0x0020 /* Slave connection for a proxy */
#define NAT_NOTRULEPORT 0x0040 /* Don't use the port # in the NAT rule */
#define NAT_TCPUDP (NAT_TCP|NAT_UDP)
#define NAT_TCPUDPICMP (NAT_TCP|NAT_UDP|NAT_ICMPERR)
#define NAT_TCPUDPICMPQ (NAT_TCP|NAT_UDP|NAT_ICMPQUERY)
#define NAT_FROMRULE (NAT_TCP|NAT_UDP)
/* 0x0100 reserved for FI_W_SPORT */
/* 0x0200 reserved for FI_W_DPORT */
/* 0x0400 reserved for FI_W_SADDR */
/* 0x0800 reserved for FI_W_DADDR */
/* 0x1000 reserved for FI_W_NEWFR */
/* 0x2000 reserved for SI_CLONE */
/* 0x4000 reserved for SI_CLONED */
/* 0x8000 reserved for SI_IGNOREPKT */
#define NAT_DEBUG 0x800000
typedef struct ipnat {
ipfmutex_t in_lock;
struct ipnat *in_next; /* NAT rule list next */
struct ipnat *in_rnext; /* rdr rule hash next */
struct ipnat **in_prnext; /* prior rdr next ptr */
struct ipnat *in_mnext; /* map rule hash next */
struct ipnat **in_pmnext; /* prior map next ptr */
struct ipftq *in_tqehead[2];
void *in_ifps[2];
void *in_apr;
char *in_comment;
i6addr_t in_next6;
u_long in_space;
u_long in_hits;
u_int in_use;
u_int in_hv;
int in_flineno; /* conf. file line number */
u_short in_pnext;
u_char in_v;
u_char in_xxx;
/* From here to the end is covered by IPN_CMPSIZ */
u_32_t in_flags;
u_32_t in_mssclamp; /* if != 0 clamp MSS to this */
u_int in_age[2];
int in_redir; /* see below for values */
int in_p; /* protocol. */
i6addr_t in_in[2];
i6addr_t in_out[2];
i6addr_t in_src[2];
frtuc_t in_tuc;
u_short in_port[2];
u_short in_ppip; /* ports per IP. */
u_short in_ippip; /* IP #'s per IP# */
char in_ifnames[2][LIFNAMSIZ];
char in_plabel[APR_LABELLEN]; /* proxy label. */
ipftag_t in_tag;
} ipnat_t;
#define in_pmin in_port[0] /* Also holds static redir port */
#define in_pmax in_port[1]
#define in_nextip in_next6.in4
#define in_nip in_next6.in4.s_addr
#define in_inip in_in[0].in4.s_addr
#define in_inmsk in_in[1].in4.s_addr
#define in_outip in_out[0].in4.s_addr
#define in_outmsk in_out[1].in4.s_addr
#define in_srcip in_src[0].in4.s_addr
#define in_srcmsk in_src[1].in4.s_addr
#define in_scmp in_tuc.ftu_scmp
#define in_dcmp in_tuc.ftu_dcmp
#define in_stop in_tuc.ftu_stop
#define in_dtop in_tuc.ftu_dtop
#define in_sport in_tuc.ftu_sport
#define in_dport in_tuc.ftu_dport
/*
* Bit definitions for in_flags
*/
#define IPN_ANY 0x00000
#define IPN_TCP 0x00001
#define IPN_UDP 0x00002
#define IPN_TCPUDP (IPN_TCP|IPN_UDP)
#define IPN_ICMPERR 0x00004
#define IPN_TCPUDPICMP (IPN_TCP|IPN_UDP|IPN_ICMPERR)
#define IPN_ICMPQUERY 0x00008
#define IPN_TCPUDPICMPQ (IPN_TCP|IPN_UDP|IPN_ICMPQUERY)
#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
#define IPN_AUTOPORTMAP 0x00010
#define IPN_IPRANGE 0x00020
#define IPN_FILTER 0x00040
#define IPN_SPLIT 0x00080
#define IPN_ROUNDR 0x00100
#define IPN_NOTSRC 0x04000
#define IPN_NOTDST 0x08000
#define IPN_DYNSRCIP 0x10000 /* dynamic src IP# */
#define IPN_DYNDSTIP 0x20000 /* dynamic dst IP# */
#define IPN_DELETE 0x40000
#define IPN_STICKY 0x80000
#define IPN_FRAG 0x100000
#define IPN_FIXEDDPORT 0x200000
#define IPN_FINDFORWARD 0x400000
#define IPN_IN 0x800000
#define IPN_SEQUENTIAL 0x1000000
#define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\
IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|\
IPN_FRAG|IPN_STICKY|IPN_FIXEDDPORT|IPN_ICMPQUERY|\
IPN_SEQUENTIAL)
/*
* Values for in_redir
*/
#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 nat_save {
void *ipn_next;
struct nat ipn_nat;
struct ipnat ipn_ipnat;
struct frentry ipn_fr;
int ipn_dsize;
char ipn_data[4];
} nat_save_t;
#define ipn_rule ipn_nat.nat_fr
typedef struct natget {
void *ng_ptr;
int ng_sz;
} natget_t;
/*
* This structure gets used to help NAT sessions keep the same NAT rule (and
* thus translation for IP address) when:
* (a) round-robin redirects are in use
* (b) different IP add
*/
typedef struct hostmap {
struct hostmap *hm_hnext;
struct hostmap **hm_phnext;
struct hostmap *hm_next;
struct hostmap **hm_pnext;
struct ipnat *hm_ipnat;
struct in_addr hm_srcip;
struct in_addr hm_dstip;
struct in_addr hm_mapip;
u_32_t hm_port;
int hm_ref;
} hostmap_t;
/*
* Structure used to pass information in to nat_newmap and nat_newrdr.
*/
typedef struct natinfo {
ipnat_t *nai_np;
u_32_t nai_sum1;
u_32_t nai_sum2;
u_32_t nai_nflags;
u_32_t nai_flags;
struct in_addr nai_ip;
u_short nai_port;
u_short nai_nport;
u_short nai_sport;
u_short nai_dport;
} natinfo_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;
u_long ns_memfail;
u_long ns_badnat;
u_long ns_addtrpnt;
nat_t **ns_table[2];
hostmap_t **ns_maptable;
ipnat_t *ns_list;
void *ns_apslist;
u_int ns_wilds;
u_int ns_nattab_sz;
u_int ns_nattab_max;
u_int ns_rultab_sz;
u_int ns_rdrtab_sz;
u_int ns_trpntab_sz;
u_int ns_hostmap_sz;
nat_t *ns_instances;
hostmap_t *ns_maplist;
u_long *ns_bucketlen[2];
u_long ns_ticks;
u_int ns_orphans;
} natstat_t;
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[2];
U_QUAD_T nl_bytes[2];
u_char nl_p;
} natlog_t;
#define NL_NEWMAP NAT_MAP
#define NL_NEWRDR NAT_REDIRECT
#define NL_NEWBIMAP NAT_BIMAP
#define NL_NEWBLOCK NAT_MAPBLK
#define NL_DESTROY 0xfffc
#define NL_CLONE 0xfffd
#define NL_FLUSH 0xfffe
#define NL_EXPIRE 0xffff
#define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (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); }
#define NAT_SYSSPACE 0x80000000
#define NAT_LOCKHELD 0x40000000
extern u_int ipf_nattable_sz;
extern u_int ipf_nattable_max;
extern u_int ipf_natrules_sz;
extern u_int ipf_rdrrules_sz;
extern u_int ipf_hostmap_sz;
extern u_int fr_nat_maxbucket;
extern u_int fr_nat_maxbucket_reset;
extern int fr_nat_lock;
extern int fr_nat_doflush;
extern void fr_natsync __P((void *));
extern u_long fr_defnatage;
extern u_long fr_defnaticmpage;
extern u_long fr_defnatipage;
/* nat_table[0] -> hashed list sorted by inside (ip, port) */
/* nat_table[1] -> hashed list sorted by outside (ip, port) */
extern nat_t **nat_table[2];
extern nat_t *nat_instances;
extern ipnat_t *nat_list;
extern ipnat_t **nat_rules;
extern ipnat_t **rdr_rules;
extern ipftq_t *nat_utqe;
extern natstat_t nat_stats;
#if defined(__OpenBSD__)
extern void nat_ifdetach __P((void *));
#endif
extern int fr_nat_ioctl __P((caddr_t, ioctlcmd_t, int, int, void *));
extern int fr_natinit __P((void));
extern nat_t *nat_new __P((fr_info_t *, ipnat_t *, nat_t **, u_int, int));
extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
struct in_addr));
extern void fix_datacksum __P((u_short *, u_32_t));
extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
struct in_addr));
extern nat_t *nat_tnlookup __P((fr_info_t *, int));
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_icmperrorlookup __P((fr_info_t *, int));
extern nat_t *nat_icmperror __P((fr_info_t *, u_int *, int));
extern void nat_delete __P((struct nat *, int));
extern int nat_insert __P((nat_t *, int));
extern int fr_checknatout __P((fr_info_t *, u_32_t *));
extern int fr_natout __P((fr_info_t *, nat_t *, int, u_32_t));
extern int fr_checknatin __P((fr_info_t *, u_32_t *));
extern int fr_natin __P((fr_info_t *, nat_t *, int, u_32_t));
extern void fr_natunload __P((void));
extern void fr_natexpire __P((void));
extern void nat_log __P((struct nat *, u_int));
extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t));
extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t));
extern void fr_ipnatderef __P((ipnat_t **));
extern void fr_natderef __P((nat_t **));
extern u_short *nat_proto __P((fr_info_t *, nat_t *, u_int));
extern void nat_update __P((fr_info_t *, nat_t *, ipnat_t *));
extern void fr_setnatqueue __P((nat_t *, int));
extern void fr_hostmapdel __P((hostmap_t **));
#endif /* __IP_NAT_H__ */