/* $NetBSD: ip_nat.h,v 1.7 2006/04/04 16:17:19 martti Exp $ */ /* * 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 * Id: ip_nat.h,v 2.90.2.11 2005/06/18 02:41:32 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 */ } 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 /* * 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 #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 { 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_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) /* * 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; #undef tr_flags typedef struct nattrpnt { struct in_addr tr_dstip; /* real destination IP# */ struct in_addr tr_srcip; /* real source IP# */ struct in_addr tr_locip; /* local source IP# */ u_int tr_flags; int tr_expire; u_short tr_dstport; /* real destination port# */ u_short tr_srcport; /* real source port# */ u_short tr_locport; /* local source port# */ struct nattrpnt *tr_hnext; struct nattrpnt **tr_phnext; struct nattrpnt *tr_next; struct nattrpnt **tr_pnext; /* previous next */ } nattrpnt_t; #define TN_CMPSIZ offsetof(nattrpnt_t, tr_hnext) /* * 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_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; nattrpnt_t *ns_trpntlist; u_long *ns_bucketlen[2]; } 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_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 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)); 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 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_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)); #endif /* __IP_NAT_H__ */