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 2.17.2.28 2002/11/03 13:06:21 darrenr Exp $
14 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
17 #if defined(__STDC__) || defined(__GNUC__)
18 #define SIOCADNAT _IOW('r', 60, struct ipnat *)
19 #define SIOCRMNAT _IOW('r', 61, struct ipnat *)
20 #define SIOCGNATS _IOWR('r', 62, struct natstat *)
21 #define SIOCGNATL _IOWR('r', 63, struct natlookup *)
23 #define SIOCADNAT _IOW(r, 60, struct ipnat *)
24 #define SIOCRMNAT _IOW(r, 61, struct ipnat *)
25 #define SIOCGNATS _IOWR(r, 62, struct natstat *)
26 #define SIOCGNATL _IOWR(r, 63, struct natlookup *)
29 #undef LARGE_NAT /* define this if you're setting up a system to NAT
30 * LARGE numbers of networks/hosts - i.e. in the
31 * hundreds or thousands. In such a case, you should
32 * also change the RDR_SIZE and NAT_SIZE below to more
33 * appropriate sizes. The figures below were used for
34 * a setup with 1000-2000 networks to NAT.
43 # define HOSTMAP_SIZE 127
46 # define NAT_TABLE_SZ 127
52 #undef HOSTMAP_SIZE 127
55 #define NAT_TABLE_SZ 16383
56 #define HOSTMAP_SIZE 8191
59 #define APR_LABELLEN 16
61 #define NAT_HW_CKSUM 0x80000000
63 #define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */
73 struct ap_session *nat_aps; /* proxy session */
74 struct frentry *nat_fr; /* filter rule ptr if appropriate */
75 struct in_addr nat_inip;
76 struct in_addr nat_outip;
77 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 u_32_t nat_mssclamp; /* if != zero clamp MSS to this */
88 struct ipnat *nat_ptr; /* pointer back to the rule */
89 struct hostmap *nat_hm;
91 struct nat *nat_hnext[2];
92 struct nat **nat_phnext[2];
96 char nat_ifname[IFNAMSIZ];
97 #if SOLARIS || defined(__sgi)
102 typedef struct ipnat {
103 struct ipnat *in_next;
104 struct ipnat *in_rnext;
105 struct ipnat **in_prnext;
106 struct ipnat *in_mnext;
107 struct ipnat **in_pmnext;
113 struct in_addr in_nextip;
115 u_short in_ippip; /* IP #'s per IP# */
116 u_32_t in_flags; /* From here to in_dport must be reflected */
117 u_32_t in_mssclamp; /* if != zero clamp MSS to this */
119 u_short in_ppip; /* ports per IP */
120 u_short in_port[2]; /* correctly in IPN_CMPSIZ */
121 struct in_addr in_in[2];
122 struct in_addr in_out[2];
123 struct in_addr in_src[2];
125 u_int in_age[2]; /* Aging for NAT entries. Not for TCP */
126 int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */
127 char in_ifname[IFNAMSIZ];
128 char in_plabel[APR_LABELLEN]; /* proxy label */
129 char in_p; /* protocol */
132 #define in_pmin in_port[0] /* Also holds static redir port */
133 #define in_pmax in_port[1]
134 #define in_nip in_nextip.s_addr
135 #define in_inip in_in[0].s_addr
136 #define in_inmsk in_in[1].s_addr
137 #define in_outip in_out[0].s_addr
138 #define in_outmsk in_out[1].s_addr
139 #define in_srcip in_src[0].s_addr
140 #define in_srcmsk in_src[1].s_addr
141 #define in_scmp in_tuc.ftu_scmp
142 #define in_dcmp in_tuc.ftu_dcmp
143 #define in_stop in_tuc.ftu_stop
144 #define in_dtop in_tuc.ftu_dtop
145 #define in_sport in_tuc.ftu_sport
146 #define in_dport in_tuc.ftu_dport
148 #define NAT_OUTBOUND 0
149 #define NAT_INBOUND 1
152 #define NAT_REDIRECT 0x02
153 #define NAT_BIMAP (NAT_MAP|NAT_REDIRECT)
154 #define NAT_MAPBLK 0x04
155 /* 0x100 reserved for FI_W_SPORT */
156 /* 0x200 reserved for FI_W_DPORT */
157 /* 0x400 reserved for FI_W_SADDR */
158 /* 0x800 reserved for FI_W_DADDR */
159 /* 0x1000 reserved for FI_W_NEWFR */
161 #define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */
162 #define USABLE_PORTS (65536 - MAPBLK_MINPORT)
164 #define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))
166 typedef struct natlookup {
167 struct in_addr nl_inip;
168 struct in_addr nl_outip;
169 struct in_addr nl_realip;
177 typedef struct nat_save {
180 struct ipnat ipn_ipnat;
181 struct frentry ipn_fr;
186 #define ipn_rule ipn_nat.nat_fr
188 typedef struct natget {
194 typedef struct hostmap {
195 struct hostmap *hm_next;
196 struct hostmap **hm_pnext;
197 struct ipnat *hm_ipnat;
198 struct in_addr hm_realip;
199 struct in_addr hm_mapip;
204 typedef struct natstat {
215 hostmap_t **ns_maptable;
226 #define IPN_ANY 0x000
227 #define IPN_TCP 0x001
228 #define IPN_UDP 0x002
229 #define IPN_TCPUDP (IPN_TCP|IPN_UDP)
230 #define IPN_DELETE 0x004
231 #define IPN_ICMPERR 0x008
232 #define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
233 #define IPN_AUTOPORTMAP 0x010
234 #define IPN_IPRANGE 0x020
235 #define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\
236 IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_FRAG)
237 #define IPN_FILTER 0x040
238 #define IPN_SPLIT 0x080
239 #define IPN_ROUNDR 0x100
240 #define IPN_NOTSRC 0x080000
241 #define IPN_NOTDST 0x100000
242 #define IPN_FRAG 0x200000
245 typedef struct natlog {
246 struct in_addr nl_origip;
247 struct in_addr nl_outip;
248 struct in_addr nl_inip;
260 #define NL_NEWMAP NAT_MAP
261 #define NL_NEWRDR NAT_REDIRECT
262 #define NL_NEWBIMAP NAT_BIMAP
263 #define NL_NEWBLOCK NAT_MAPBLK
264 #define NL_FLUSH 0xfffe
265 #define NL_EXPIRE 0xffff
267 #define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m))
269 #define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16))
271 #define CALC_SUMD(s1, s2, sd) { \
272 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
273 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
275 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
276 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
277 /* Because ~1 == -2, We really need ~1 == -1 */ \
278 if ((s1) > (s2)) (s2)--; \
279 (sd) = (s2) - (s1); \
280 (sd) = ((sd) & 0xffff) + ((sd) >> 16); }
282 #define NAT_SYSSPACE 0x80000000
283 #define NAT_LOCKHELD 0x40000000
285 extern u_int ipf_nattable_sz;
286 extern u_int ipf_natrules_sz;
287 extern u_int ipf_rdrrules_sz;
288 extern int fr_nat_lock;
289 extern void ip_natsync __P((void *));
290 extern u_long fr_defnatage;
291 extern u_long fr_defnaticmpage;
292 extern nat_t **nat_table[2];
293 extern nat_t *nat_instances;
294 extern ipnat_t **nat_rules;
295 extern ipnat_t **rdr_rules;
296 extern ipnat_t *nat_list;
297 extern natstat_t nat_stats;
298 #if defined(__OpenBSD__)
299 extern void nat_ifdetach __P((void *));
301 #if defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
302 extern int nat_ioctl __P((caddr_t, u_long, int));
304 extern int nat_ioctl __P((caddr_t, int, int));
306 extern int nat_init __P((void));
307 extern nat_t *nat_new __P((fr_info_t *, ip_t *, ipnat_t *, nat_t **,
309 extern nat_t *nat_outlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
310 struct in_addr, int));
311 extern nat_t *nat_inlookup __P((fr_info_t *, u_int, u_int, struct in_addr,
312 struct in_addr, int));
313 extern nat_t *nat_lookupredir __P((natlookup_t *));
314 extern nat_t *nat_icmplookup __P((ip_t *, fr_info_t *, int));
315 extern nat_t *nat_icmp __P((ip_t *, fr_info_t *, u_int *, int));
316 extern int nat_clearlist __P((void));
317 extern void nat_insert __P((nat_t *));
319 extern int ip_natout __P((ip_t *, fr_info_t *));
320 extern int ip_natin __P((ip_t *, fr_info_t *));
321 extern void ip_natunload __P((void)), ip_natexpire __P((void));
322 extern void nat_log __P((struct nat *, u_int));
323 extern void fix_incksum __P((fr_info_t *, u_short *, u_32_t));
324 extern void fix_outcksum __P((fr_info_t *, u_short *, u_32_t));
325 extern void fix_datacksum __P((u_short *, u_32_t));
327 #endif /* __IP_NAT_H__ */