/* $NetBSD: ip_nat.h,v 1.27 2002/09/19 08:09:17 martti Exp $ */ /* * Copyright (C) 1995-2001 by Darren Reed. * * See the IPFILTER.LICENCE file for details on licencing. * * @(#)ip_nat.h 1.5 2/4/96 * Id: ip_nat.h,v 2.17.2.27 2002/08/28 12:45:51 darrenr Exp */ #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', 60, struct ipnat *) #define SIOCRMNAT _IOW('r', 61, struct ipnat *) #define SIOCGNATS _IOWR('r', 62, struct natstat *) #define SIOCGNATL _IOWR('r', 63, struct natlookup *) #else #define SIOCADNAT _IOW(r, 60, struct ipnat *) #define SIOCRMNAT _IOW(r, 61, struct ipnat *) #define SIOCGNATS _IOWR(r, 62, struct natstat *) #define SIOCGNATL _IOWR(r, 63, struct natlookup *) #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 # define NAT_SIZE 127 #endif #ifndef RDR_SIZE # define RDR_SIZE 127 #endif #ifndef HOSTMAP_SIZE # define HOSTMAP_SIZE 127 #endif #ifndef NAT_TABLE_SZ # define NAT_TABLE_SZ 127 #endif #ifdef LARGE_NAT #undef NAT_SIZE #undef RDR_SIZE #undef NAT_TABLE_SZ #undef HOSTMAP_SIZE 127 #define NAT_SIZE 2047 #define RDR_SIZE 2047 #define NAT_TABLE_SZ 16383 #define HOSTMAP_SIZE 8191 #endif #ifndef APR_LABELLEN #define APR_LABELLEN 16 #endif #define NAT_HW_CKSUM 0x80000000 #define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */ struct ap_session; typedef struct nat { u_long nat_age; int nat_flags; u_32_t nat_sumd[2]; u_32_t nat_ipsumd; void *nat_data; struct ap_session *nat_aps; /* proxy session */ struct frentry *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_32_t nat_mssclamp; /* if != zero clamp MSS to this */ U_QUAD_T nat_pkts; U_QUAD_T nat_bytes; u_int nat_drop[2]; 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 hostmap *nat_hm; struct nat *nat_next; struct nat *nat_hnext[2]; struct nat **nat_phnext[2]; struct nat **nat_me; void *nat_ifp; int nat_dir; char nat_ifname[IFNAMSIZ]; #if SOLARIS || defined(__sgi) kmutex_t nat_lock; #endif } nat_t; typedef struct ipnat { struct ipnat *in_next; struct ipnat *in_rnext; struct ipnat **in_prnext; struct ipnat *in_mnext; struct ipnat **in_pmnext; 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_ippip; /* IP #'s per IP# */ u_32_t in_mssclamp; /* if != zero clamp MSS to this */ u_32_t in_flags; /* From here to in_dport must be reflected */ u_short in_spare; u_short in_ppip; /* ports per IP */ 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]; struct frtuc in_tuc; u_int in_age[2]; /* Aging for NAT entries. Not for TCP */ 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 */ } 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 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 #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 /* 0x100 reserved for FI_W_SPORT */ /* 0x200 reserved for FI_W_DPORT */ /* 0x400 reserved for FI_W_SADDR */ /* 0x800 reserved for FI_W_DADDR */ /* 0x1000 reserved for FI_W_NEWFR */ #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; typedef struct hostmap { struct hostmap *hm_next; struct hostmap **hm_pnext; struct ipnat *hm_ipnat; struct in_addr hm_realip; struct in_addr hm_mapip; int hm_ref; } hostmap_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; nat_t **ns_table[2]; hostmap_t **ns_maptable; ipnat_t *ns_list; void *ns_apslist; u_int ns_nattab_sz; u_int ns_rultab_sz; u_int ns_rdrtab_sz; u_int ns_hostmap_sz; nat_t *ns_instances; u_int ns_wilds; } natstat_t; #define IPN_ANY 0x000 #define IPN_TCP 0x001 #define IPN_UDP 0x002 #define IPN_TCPUDP (IPN_TCP|IPN_UDP) #define IPN_DELETE 0x004 #define IPN_ICMPERR 0x008 #define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR) #define IPN_AUTOPORTMAP 0x010 #define IPN_IPRANGE 0x020 #define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\ IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_FRAG) #define IPN_FILTER 0x040 #define IPN_SPLIT 0x080 #define IPN_ROUNDR 0x100 #define IPN_NOTSRC 0x080000 #define IPN_NOTDST 0x100000 #define IPN_FRAG 0x200000 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; 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_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_natrules_sz; extern u_int ipf_rdrrules_sz; extern int fr_nat_lock; 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 ipnat_t *nat_list; extern natstat_t nat_stats; #if defined(__OpenBSD__) extern void nat_ifdetach __P((void *)); #endif #if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003) extern int nat_ioctl __P((caddr_t, u_long, int)); #else extern int nat_ioctl __P((caddr_t, int, int)); #endif extern int nat_init __P((void)); extern nat_t *nat_new __P((fr_info_t *, ip_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, int)); extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr, struct in_addr, int)); extern nat_t *nat_lookupredir __P((natlookup_t *)); extern nat_t *nat_icmplookup __P((ip_t *, fr_info_t *, int)); extern nat_t *nat_icmp __P((ip_t *, fr_info_t *, u_int *, int)); extern int nat_clearlist __P((void)); extern void nat_insert __P((nat_t *)); 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((fr_info_t *, u_short *, u_32_t)); extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t)); extern void fix_datacksum __P((u_short *, u_32_t)); #endif /* _NETINET_IP_NAT_H_ */