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 2.17.2.27 2002/08/28 12:45:51 darrenr Exp $
8 * $FreeBSD: src/sys/contrib/ipfilter/netinet/ip_nat.h,v 1.15.2.5 2003/03/01 03:55:54 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 */
82 u_short nat_oport; /* other port */
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;
92 struct nat *nat_hnext[2];
93 struct nat **nat_phnext[2];
97 char nat_ifname[IFNAMSIZ];
98 #if SOLARIS || defined(__sgi)
103 typedef 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;
114 struct in_addr in_nextip;
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 */
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];
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 */
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
149 #define NAT_OUTBOUND 0
150 #define NAT_INBOUND 1
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 */
162 #define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */
163 #define USABLE_PORTS (65536 - MAPBLK_MINPORT)
165 #define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))
167 typedef struct natlookup {
168 struct in_addr nl_inip;
169 struct in_addr nl_outip;
170 struct in_addr nl_realip;
178 typedef struct nat_save {
181 struct ipnat ipn_ipnat;
182 struct frentry ipn_fr;
187 #define ipn_rule ipn_nat.nat_fr
189 typedef struct natget {
195 typedef 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;
205 typedef struct natstat {
216 hostmap_t **ns_maptable;
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
246 typedef struct natlog {
247 struct in_addr nl_origip;
248 struct in_addr nl_outip;
249 struct in_addr nl_inip;
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
268 #define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m))
270 #define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16))
272 #define CALC_SUMD(s1, s2, sd) { \
273 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
274 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
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); }
283 #define NAT_SYSSPACE 0x80000000
284 #define NAT_LOCKHELD 0x40000000
286 extern u_int ipf_nattable_sz;
287 extern u_int ipf_natrules_sz;
288 extern u_int ipf_rdrrules_sz;
289 extern int fr_nat_lock;
290 extern void ip_natsync __P((void *));
291 extern u_long fr_defnatage;
292 extern u_long fr_defnaticmpage;
293 extern nat_t **nat_table[2];
294 extern nat_t *nat_instances;
295 extern ipnat_t **nat_rules;
296 extern ipnat_t **rdr_rules;
297 extern ipnat_t *nat_list;
298 extern natstat_t nat_stats;
299 #if defined(__OpenBSD__)
300 extern void nat_ifdetach __P((void *));
302 #if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
303 extern int nat_ioctl __P((caddr_t, u_long, int));
305 extern int nat_ioctl __P((caddr_t, int, int));
307 extern int nat_init __P((void));
308 extern nat_t *nat_new __P((fr_info_t *, ip_t *, ipnat_t *, nat_t **,
310 extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
311 struct in_addr, int));
312 extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
313 struct in_addr, int));
314 extern nat_t *nat_lookupredir __P((natlookup_t *));
315 extern nat_t *nat_icmplookup __P((ip_t *, fr_info_t *, int));
316 extern nat_t *nat_icmp __P((ip_t *, fr_info_t *, u_int *, int));
317 extern int nat_clearlist __P((void));
318 extern void nat_insert __P((nat_t *));
320 extern int ip_natout __P((ip_t *, fr_info_t *));
321 extern int ip_natin __P((ip_t *, fr_info_t *));
322 extern void ip_natunload __P((void)), ip_natexpire __P((void));
323 extern void nat_log __P((struct nat *, u_int));
324 extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t));
325 extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t));
326 extern void fix_datacksum __P((u_short *, u_32_t));
328 #endif /* __IP_NAT_H__ */