ip_nat.h revision 110916
1/* 2 * Copyright (C) 1995-2001 by Darren Reed. 3 * 4 * See the IPFILTER.LICENCE file for details on licencing. 5 * 6 * @(#)ip_nat.h 1.5 2/4/96 7 * $Id: ip_nat.h,v 2.17.2.14 2000/11/18 03:58:04 darrenr Exp $ 8 * $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_nat.h 110916 2003-02-15 06:25:25Z darrenr $ 9 */ 10 11#ifndef __IP_NAT_H__ 12#define __IP_NAT_H__ 13 14#ifndef SOLARIS 15#define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4))) 16#endif 17 18#if defined(__STDC__) || defined(__GNUC__) 19#define SIOCADNAT _IOW('r', 60, struct ipnat *) 20#define SIOCRMNAT _IOW('r', 61, struct ipnat *) 21#define SIOCGNATS _IOWR('r', 62, struct natstat *) 22#define SIOCGNATL _IOWR('r', 63, struct natlookup *) 23#else 24#define SIOCADNAT _IOW(r, 60, struct ipnat *) 25#define SIOCRMNAT _IOW(r, 61, struct ipnat *) 26#define SIOCGNATS _IOWR(r, 62, struct natstat *) 27#define SIOCGNATL _IOWR(r, 63, struct natlookup *) 28#endif 29 30#undef LARGE_NAT /* define this if you're setting up a system to NAT 31 * LARGE numbers of networks/hosts - i.e. in the 32 * hundreds or thousands. In such a case, you should 33 * also change the RDR_SIZE and NAT_SIZE below to more 34 * appropriate sizes. The figures below were used for 35 * a setup with 1000-2000 networks to NAT. 36 */ 37#ifndef NAT_SIZE 38# define NAT_SIZE 127 39#endif 40#ifndef RDR_SIZE 41# define RDR_SIZE 127 42#endif 43#ifndef HOSTMAP_SIZE 44# define HOSTMAP_SIZE 127 45#endif 46#ifndef NAT_TABLE_SZ 47# define NAT_TABLE_SZ 127 48#endif 49#ifdef LARGE_NAT 50#undef NAT_SIZE 51#undef RDR_SIZE 52#undef NAT_TABLE_SZ 53#undef HOSTMAP_SIZE 127 54#define NAT_SIZE 2047 55#define RDR_SIZE 2047 56#define NAT_TABLE_SZ 16383 57#define HOSTMAP_SIZE 8191 58#endif 59#ifndef APR_LABELLEN 60#define APR_LABELLEN 16 61#endif 62#define NAT_HW_CKSUM 0x80000000 63 64#define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */ 65 66struct ap_session; 67 68typedef struct nat { 69 u_long nat_age; 70 int nat_flags; 71 u_32_t nat_sumd[2]; 72 u_32_t nat_ipsumd; 73 void *nat_data; 74 struct ap_session *nat_aps; /* proxy session */ 75 struct frentry *nat_fr; /* filter rule ptr if appropriate */ 76 struct in_addr nat_inip; 77 struct in_addr nat_outip; 78 struct in_addr nat_oip; /* other ip */ 79 U_QUAD_T nat_pkts; 80 U_QUAD_T nat_bytes; 81 u_int nat_drop[2]; 82 u_short nat_oport; /* other port */ 83 u_short nat_inport; 84 u_short nat_outport; 85 u_short nat_use; 86 u_char nat_tcpstate[2]; 87 u_char nat_p; /* protocol for NAT */ 88 u_32_t nat_mssclamp; /* if != zero clamp MSS to this */ 89 struct ipnat *nat_ptr; /* pointer back to the rule */ 90 struct hostmap *nat_hm; 91 struct nat *nat_next; 92 struct nat *nat_hnext[2]; 93 struct nat **nat_phnext[2]; 94 struct nat **nat_me; 95 void *nat_ifp; 96 int nat_dir; 97 char nat_ifname[IFNAMSIZ]; 98#if SOLARIS || defined(__sgi) 99 kmutex_t nat_lock; 100#endif 101} nat_t; 102 103typedef struct ipnat { 104 struct ipnat *in_next; 105 struct ipnat *in_rnext; 106 struct ipnat **in_prnext; 107 struct ipnat *in_mnext; 108 struct ipnat **in_pmnext; 109 void *in_ifp; 110 void *in_apr; 111 u_long in_space; 112 u_int in_use; 113 u_int in_hits; 114 struct in_addr in_nextip; 115 u_short in_pnext; 116 u_short in_ippip; /* IP #'s per IP# */ 117 u_32_t in_flags; /* From here to in_dport must be reflected */ 118 u_32_t in_mssclamp; /* if != zero clamp MSS to this */ 119 u_short in_spare; 120 u_short in_ppip; /* ports per IP */ 121 u_short in_port[2]; /* correctly in IPN_CMPSIZ */ 122 struct in_addr in_in[2]; 123 struct in_addr in_out[2]; 124 struct in_addr in_src[2]; 125 struct frtuc in_tuc; 126 u_int in_age[2]; /* Aging for NAT entries. Not for TCP */ 127 int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */ 128 char in_ifname[IFNAMSIZ]; 129 char in_plabel[APR_LABELLEN]; /* proxy label */ 130 char in_p; /* protocol */ 131} ipnat_t; 132 133#define in_pmin in_port[0] /* Also holds static redir port */ 134#define in_pmax in_port[1] 135#define in_nip in_nextip.s_addr 136#define in_inip in_in[0].s_addr 137#define in_inmsk in_in[1].s_addr 138#define in_outip in_out[0].s_addr 139#define in_outmsk in_out[1].s_addr 140#define in_srcip in_src[0].s_addr 141#define in_srcmsk in_src[1].s_addr 142#define in_scmp in_tuc.ftu_scmp 143#define in_dcmp in_tuc.ftu_dcmp 144#define in_stop in_tuc.ftu_stop 145#define in_dtop in_tuc.ftu_dtop 146#define in_sport in_tuc.ftu_sport 147#define in_dport in_tuc.ftu_dport 148 149#define NAT_OUTBOUND 0 150#define NAT_INBOUND 1 151 152#define NAT_MAP 0x01 153#define NAT_REDIRECT 0x02 154#define NAT_BIMAP (NAT_MAP|NAT_REDIRECT) 155#define NAT_MAPBLK 0x04 156/* 0x100 reserved for FI_W_SPORT */ 157/* 0x200 reserved for FI_W_DPORT */ 158/* 0x400 reserved for FI_W_SADDR */ 159/* 0x800 reserved for FI_W_DADDR */ 160/* 0x1000 reserved for FI_W_NEWFR */ 161 162#define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */ 163#define USABLE_PORTS (65536 - MAPBLK_MINPORT) 164 165#define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags)) 166 167typedef struct natlookup { 168 struct in_addr nl_inip; 169 struct in_addr nl_outip; 170 struct in_addr nl_realip; 171 int nl_flags; 172 u_short nl_inport; 173 u_short nl_outport; 174 u_short nl_realport; 175} natlookup_t; 176 177 178typedef struct nat_save { 179 void *ipn_next; 180 struct nat ipn_nat; 181 struct ipnat ipn_ipnat; 182 struct frentry ipn_fr; 183 int ipn_dsize; 184 char ipn_data[4]; 185} nat_save_t; 186 187#define ipn_rule ipn_nat.nat_fr 188 189typedef struct natget { 190 void *ng_ptr; 191 int ng_sz; 192} natget_t; 193 194 195typedef struct hostmap { 196 struct hostmap *hm_next; 197 struct hostmap **hm_pnext; 198 struct ipnat *hm_ipnat; 199 struct in_addr hm_realip; 200 struct in_addr hm_mapip; 201 int hm_ref; 202} hostmap_t; 203 204 205typedef struct natstat { 206 u_long ns_mapped[2]; 207 u_long ns_rules; 208 u_long ns_added; 209 u_long ns_expire; 210 u_long ns_inuse; 211 u_long ns_logged; 212 u_long ns_logfail; 213 u_long ns_memfail; 214 u_long ns_badnat; 215 nat_t **ns_table[2]; 216 hostmap_t **ns_maptable; 217 ipnat_t *ns_list; 218 void *ns_apslist; 219 u_int ns_nattab_sz; 220 u_int ns_rultab_sz; 221 u_int ns_rdrtab_sz; 222 u_int ns_hostmap_sz; 223 nat_t *ns_instances; 224 u_int ns_wilds; 225} natstat_t; 226 227#define IPN_ANY 0x000 228#define IPN_TCP 0x001 229#define IPN_UDP 0x002 230#define IPN_TCPUDP (IPN_TCP|IPN_UDP) 231#define IPN_DELETE 0x004 232#define IPN_ICMPERR 0x008 233#define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR) 234#define IPN_AUTOPORTMAP 0x010 235#define IPN_IPRANGE 0x020 236#define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\ 237 IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_FRAG) 238#define IPN_FILTER 0x040 239#define IPN_SPLIT 0x080 240#define IPN_ROUNDR 0x100 241#define IPN_NOTSRC 0x080000 242#define IPN_NOTDST 0x100000 243#define IPN_FRAG 0x200000 244 245 246typedef struct natlog { 247 struct in_addr nl_origip; 248 struct in_addr nl_outip; 249 struct in_addr nl_inip; 250 u_short nl_origport; 251 u_short nl_outport; 252 u_short nl_inport; 253 u_short nl_type; 254 int nl_rule; 255 U_QUAD_T nl_pkts; 256 U_QUAD_T nl_bytes; 257 u_char nl_p; 258} natlog_t; 259 260 261#define NL_NEWMAP NAT_MAP 262#define NL_NEWRDR NAT_REDIRECT 263#define NL_NEWBIMAP NAT_BIMAP 264#define NL_NEWBLOCK NAT_MAPBLK 265#define NL_FLUSH 0xfffe 266#define NL_EXPIRE 0xffff 267 268#define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m)) 269 270#define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16)) 271 272#define CALC_SUMD(s1, s2, sd) { \ 273 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \ 274 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \ 275 /* Do it twice */ \ 276 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \ 277 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \ 278 /* Because ~1 == -2, We really need ~1 == -1 */ \ 279 if ((s1) > (s2)) (s2)--; \ 280 (sd) = (s2) - (s1); \ 281 (sd) = ((sd) & 0xffff) + ((sd) >> 16); } 282 283#define NAT_SYSSPACE 0x80000000 284#define NAT_LOCKHELD 0x40000000 285 286extern u_int ipf_nattable_sz; 287extern u_int ipf_natrules_sz; 288extern u_int ipf_rdrrules_sz; 289extern int fr_nat_lock; 290extern void ip_natsync __P((void *)); 291extern u_long fr_defnatage; 292extern u_long fr_defnaticmpage; 293extern nat_t **nat_table[2]; 294extern nat_t *nat_instances; 295extern ipnat_t **nat_rules; 296extern ipnat_t **rdr_rules; 297extern ipnat_t *nat_list; 298extern natstat_t nat_stats; 299#if defined(__OpenBSD__) 300extern void nat_ifdetach __P((void *)); 301#endif 302#if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003) 303extern int nat_ioctl __P((caddr_t, u_long, int)); 304#else 305extern int nat_ioctl __P((caddr_t, int, int)); 306#endif 307extern int nat_init __P((void)); 308extern nat_t *nat_new __P((fr_info_t *, ip_t *, ipnat_t *, nat_t **, 309 u_int, int)); 310extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr, 311 struct in_addr, int)); 312extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr, 313 struct in_addr, int)); 314extern nat_t *nat_lookupredir __P((natlookup_t *)); 315extern nat_t *nat_icmplookup __P((ip_t *, fr_info_t *, int)); 316extern nat_t *nat_icmp __P((ip_t *, fr_info_t *, u_int *, int)); 317extern int nat_clearlist __P((void)); 318extern void nat_insert __P((nat_t *)); 319 320extern int ip_natout __P((ip_t *, fr_info_t *)); 321extern int ip_natin __P((ip_t *, fr_info_t *)); 322extern void ip_natunload __P((void)), ip_natexpire __P((void)); 323extern void nat_log __P((struct nat *, u_int)); 324extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t)); 325extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t)); 326extern void fix_datacksum __P((u_short *, u_32_t)); 327 328#endif /* __IP_NAT_H__ */ 329