2 * Copyright (C) 1995-2001 by Darren Reed.
4 * See the IPFILTER.LICENCE file for details on licencing.
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 $
15 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
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 *)
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 *)
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.
44 # define HOSTMAP_SIZE 127
47 # define NAT_TABLE_SZ 127
53 #undef HOSTMAP_SIZE 127
56 #define NAT_TABLE_SZ 16383
57 #define HOSTMAP_SIZE 8191
60 #define APR_LABELLEN 16
62 #define NAT_HW_CKSUM 0x80000000
64 #define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */
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 */
81 u_short nat_oport; /* other port */
85 u_char nat_tcpstate[2];
86 u_char nat_p; /* protocol for NAT */
87 struct ipnat *nat_ptr; /* pointer back to the rule */
88 struct hostmap *nat_hm;
90 struct nat *nat_hnext[2];
91 struct nat **nat_phnext[2];
95 char nat_ifname[IFNAMSIZ];
96 #if SOLARIS || defined(__sgi)
101 typedef struct ipnat {
102 struct ipnat *in_next;
103 struct ipnat *in_rnext;
104 struct ipnat **in_prnext;
105 struct ipnat *in_mnext;
106 struct ipnat **in_pmnext;
112 struct in_addr in_nextip;
114 u_short in_ippip; /* IP #'s per IP# */
115 u_32_t in_flags; /* From here to in_dport must be reflected */
117 u_short in_ppip; /* ports per IP */
118 u_short in_port[2]; /* correctly in IPN_CMPSIZ */
119 struct in_addr in_in[2];
120 struct in_addr in_out[2];
121 struct in_addr in_src[2];
123 u_int in_age[2]; /* Aging for NAT entries. Not for TCP */
124 int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */
125 char in_ifname[IFNAMSIZ];
126 char in_plabel[APR_LABELLEN]; /* proxy label */
127 char in_p; /* protocol */
130 #define in_pmin in_port[0] /* Also holds static redir port */
131 #define in_pmax in_port[1]
132 #define in_nip in_nextip.s_addr
133 #define in_inip in_in[0].s_addr
134 #define in_inmsk in_in[1].s_addr
135 #define in_outip in_out[0].s_addr
136 #define in_outmsk in_out[1].s_addr
137 #define in_srcip in_src[0].s_addr
138 #define in_srcmsk in_src[1].s_addr
139 #define in_scmp in_tuc.ftu_scmp
140 #define in_dcmp in_tuc.ftu_dcmp
141 #define in_stop in_tuc.ftu_stop
142 #define in_dtop in_tuc.ftu_dtop
143 #define in_sport in_tuc.ftu_sport
144 #define in_dport in_tuc.ftu_dport
146 #define NAT_OUTBOUND 0
147 #define NAT_INBOUND 1
150 #define NAT_REDIRECT 0x02
151 #define NAT_BIMAP (NAT_MAP|NAT_REDIRECT)
152 #define NAT_MAPBLK 0x04
153 /* 0x100 reserved for FI_W_SPORT */
154 /* 0x200 reserved for FI_W_DPORT */
155 /* 0x400 reserved for FI_W_SADDR */
156 /* 0x800 reserved for FI_W_DADDR */
157 /* 0x1000 reserved for FI_W_NEWFR */
159 #define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */
160 #define USABLE_PORTS (65536 - MAPBLK_MINPORT)
162 #define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))
164 typedef struct natlookup {
165 struct in_addr nl_inip;
166 struct in_addr nl_outip;
167 struct in_addr nl_realip;
175 typedef struct nat_save {
178 struct ipnat ipn_ipnat;
179 struct frentry ipn_fr;
184 #define ipn_rule ipn_nat.nat_fr
186 typedef struct natget {
192 typedef struct hostmap {
193 struct hostmap *hm_next;
194 struct hostmap **hm_pnext;
195 struct ipnat *hm_ipnat;
196 struct in_addr hm_realip;
197 struct in_addr hm_mapip;
202 typedef struct natstat {
213 hostmap_t **ns_maptable;
224 #define IPN_ANY 0x000
225 #define IPN_TCP 0x001
226 #define IPN_UDP 0x002
227 #define IPN_TCPUDP (IPN_TCP|IPN_UDP)
228 #define IPN_DELETE 0x004
229 #define IPN_ICMPERR 0x008
230 #define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
231 #define IPN_AUTOPORTMAP 0x010
232 #define IPN_IPRANGE 0x020
233 #define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\
234 IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_FRAG)
235 #define IPN_FILTER 0x040
236 #define IPN_SPLIT 0x080
237 #define IPN_ROUNDR 0x100
238 #define IPN_NOTSRC 0x080000
239 #define IPN_NOTDST 0x100000
240 #define IPN_FRAG 0x200000
243 typedef struct natlog {
244 struct in_addr nl_origip;
245 struct in_addr nl_outip;
246 struct in_addr nl_inip;
258 #define NL_NEWMAP NAT_MAP
259 #define NL_NEWRDR NAT_REDIRECT
260 #define NL_NEWBIMAP NAT_BIMAP
261 #define NL_NEWBLOCK NAT_MAPBLK
262 #define NL_FLUSH 0xfffe
263 #define NL_EXPIRE 0xffff
265 #define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m))
267 #define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16))
269 #define CALC_SUMD(s1, s2, sd) { \
270 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
271 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
273 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
274 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
275 /* Because ~1 == -2, We really need ~1 == -1 */ \
276 if ((s1) > (s2)) (s2)--; \
277 (sd) = (s2) - (s1); \
278 (sd) = ((sd) & 0xffff) + ((sd) >> 16); }
280 #define NAT_SYSSPACE 0x80000000
281 #define NAT_LOCKHELD 0x40000000
283 extern u_int ipf_nattable_sz;
284 extern u_int ipf_natrules_sz;
285 extern u_int ipf_rdrrules_sz;
286 extern int fr_nat_lock;
287 extern void ip_natsync __P((void *));
288 extern u_long fr_defnatage;
289 extern u_long fr_defnaticmpage;
290 extern nat_t **nat_table[2];
291 extern nat_t *nat_instances;
292 extern ipnat_t **nat_rules;
293 extern ipnat_t **rdr_rules;
294 extern ipnat_t *nat_list;
295 extern natstat_t nat_stats;
296 #if defined(__OpenBSD__)
297 extern void nat_ifdetach __P((void *));
299 #if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
300 extern int nat_ioctl __P((caddr_t, u_long, int));
302 extern int nat_ioctl __P((caddr_t, int, int));
304 extern int nat_init __P((void));
305 extern nat_t *nat_new __P((fr_info_t *, ip_t *, ipnat_t *, nat_t **,
307 extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
308 struct in_addr, int));
309 extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
310 struct in_addr, int));
311 extern nat_t *nat_lookupredir __P((natlookup_t *));
312 extern nat_t *nat_icmplookup __P((ip_t *, fr_info_t *, int));
313 extern nat_t *nat_icmp __P((ip_t *, fr_info_t *, u_int *, int));
314 extern int nat_clearlist __P((void));
315 extern void nat_insert __P((nat_t *));
317 extern int ip_natout __P((ip_t *, fr_info_t *));
318 extern int ip_natin __P((ip_t *, fr_info_t *));
319 extern void ip_natunload __P((void)), ip_natexpire __P((void));
320 extern void nat_log __P((struct nat *, u_int));
321 extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t));
322 extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t));
323 extern void fix_datacksum __P((u_short *, u_32_t));
325 #endif /* __IP_NAT_H__ */