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 1.15.2.6 2004/07/04 09:24:39 darrenr Exp $
9 * $DragonFly: src/sys/contrib/ipfilter/netinet/ip_nat.h,v 1.5 2004/07/28 00:22:37 hmp Exp $
15 #include <sys/ioccom.h>
18 #define SOLARIS (defined(sun) && (defined(__svr4__) || defined(__SVR4)))
21 #if defined(__STDC__) || defined(__GNUC__)
22 #define SIOCADNAT _IOW('r', 60, struct ipnat *)
23 #define SIOCRMNAT _IOW('r', 61, struct ipnat *)
24 #define SIOCGNATS _IOWR('r', 62, struct natstat *)
25 #define SIOCGNATL _IOWR('r', 63, struct natlookup *)
27 #define SIOCADNAT _IOW(r, 60, struct ipnat *)
28 #define SIOCRMNAT _IOW(r, 61, struct ipnat *)
29 #define SIOCGNATS _IOWR(r, 62, struct natstat *)
30 #define SIOCGNATL _IOWR(r, 63, struct natlookup *)
33 #undef LARGE_NAT /* define this if you're setting up a system to NAT
34 * LARGE numbers of networks/hosts - i.e. in the
35 * hundreds or thousands. In such a case, you should
36 * also change the RDR_SIZE and NAT_SIZE below to more
37 * appropriate sizes. The figures below were used for
38 * a setup with 1000-2000 networks to NAT.
42 # define NAT_SIZE 2047
49 # define RDR_SIZE 2047
56 # define HOSTMAP_SIZE 8191
58 # define HOSTMAP_SIZE 2047
63 # define NAT_TABLE_MAX 180000
65 # define NAT_TABLE_MAX 30000
70 # define NAT_TABLE_SZ 16383
72 # define NAT_TABLE_SZ 2047
76 #define APR_LABELLEN 16
78 #define NAT_HW_CKSUM 0x80000000
80 #define DEF_NAT_AGE 1200 /* 10 minutes (600 seconds) */
90 struct ap_session *nat_aps; /* proxy session */
91 struct frentry *nat_fr; /* filter rule ptr if appropriate */
92 struct in_addr nat_inip;
93 struct in_addr nat_outip;
94 struct in_addr nat_oip; /* other ip */
98 u_short nat_oport; /* other port */
102 u_char nat_tcpstate[2];
103 u_char nat_p; /* protocol for NAT */
104 u_32_t nat_mssclamp; /* if != zero clamp MSS to this */
105 struct ipnat *nat_ptr; /* pointer back to the rule */
106 struct hostmap *nat_hm;
107 struct nat *nat_next;
108 struct nat *nat_hnext[2];
109 struct nat **nat_phnext[2];
113 char nat_ifname[IFNAMSIZ];
114 #if SOLARIS || defined(__sgi)
119 typedef struct ipnat {
120 struct ipnat *in_next;
121 struct ipnat *in_rnext;
122 struct ipnat **in_prnext;
123 struct ipnat *in_mnext;
124 struct ipnat **in_pmnext;
130 struct in_addr in_nextip;
132 u_short in_ippip; /* IP #'s per IP# */
133 u_32_t in_flags; /* From here to in_dport must be reflected */
134 u_32_t in_mssclamp; /* if != zero clamp MSS to this */
136 u_short in_ppip; /* ports per IP */
137 u_short in_port[2]; /* correctly in IPN_CMPSIZ */
138 struct in_addr in_in[2];
139 struct in_addr in_out[2];
140 struct in_addr in_src[2];
142 u_int in_age[2]; /* Aging for NAT entries. Not for TCP */
143 int in_redir; /* 0 if it's a mapping, 1 if it's a hard redir */
144 char in_ifname[IFNAMSIZ];
145 char in_plabel[APR_LABELLEN]; /* proxy label */
146 char in_p; /* protocol */
149 #define in_pmin in_port[0] /* Also holds static redir port */
150 #define in_pmax in_port[1]
151 #define in_nip in_nextip.s_addr
152 #define in_inip in_in[0].s_addr
153 #define in_inmsk in_in[1].s_addr
154 #define in_outip in_out[0].s_addr
155 #define in_outmsk in_out[1].s_addr
156 #define in_srcip in_src[0].s_addr
157 #define in_srcmsk in_src[1].s_addr
158 #define in_scmp in_tuc.ftu_scmp
159 #define in_dcmp in_tuc.ftu_dcmp
160 #define in_stop in_tuc.ftu_stop
161 #define in_dtop in_tuc.ftu_dtop
162 #define in_sport in_tuc.ftu_sport
163 #define in_dport in_tuc.ftu_dport
165 #define NAT_OUTBOUND 0
166 #define NAT_INBOUND 1
169 #define NAT_REDIRECT 0x02
170 #define NAT_BIMAP (NAT_MAP|NAT_REDIRECT)
171 #define NAT_MAPBLK 0x04
172 /* 0x100 reserved for FI_W_SPORT */
173 /* 0x200 reserved for FI_W_DPORT */
174 /* 0x400 reserved for FI_W_SADDR */
175 /* 0x800 reserved for FI_W_DADDR */
176 /* 0x1000 reserved for FI_W_NEWFR */
178 #define MAPBLK_MINPORT 1024 /* don't use reserved ports for src port */
179 #define USABLE_PORTS (65536 - MAPBLK_MINPORT)
181 #define IPN_CMPSIZ (sizeof(ipnat_t) - offsetof(ipnat_t, in_flags))
183 typedef struct natlookup {
184 struct in_addr nl_inip;
185 struct in_addr nl_outip;
186 struct in_addr nl_realip;
194 typedef struct nat_save {
197 struct ipnat ipn_ipnat;
198 struct frentry ipn_fr;
203 #define ipn_rule ipn_nat.nat_fr
205 typedef struct natget {
211 typedef struct hostmap {
212 struct hostmap *hm_next;
213 struct hostmap **hm_pnext;
214 struct ipnat *hm_ipnat;
215 struct in_addr hm_realip;
216 struct in_addr hm_mapip;
221 typedef struct natstat {
232 hostmap_t **ns_maptable;
243 #define IPN_ANY 0x000
244 #define IPN_TCP 0x001
245 #define IPN_UDP 0x002
246 #define IPN_TCPUDP (IPN_TCP|IPN_UDP)
247 #define IPN_DELETE 0x004
248 #define IPN_ICMPERR 0x008
249 #define IPN_RF (IPN_TCPUDP|IPN_DELETE|IPN_ICMPERR)
250 #define IPN_AUTOPORTMAP 0x010
251 #define IPN_IPRANGE 0x020
252 #define IPN_USERFLAGS (IPN_TCPUDP|IPN_AUTOPORTMAP|IPN_IPRANGE|IPN_SPLIT|\
253 IPN_ROUNDR|IPN_FILTER|IPN_NOTSRC|IPN_NOTDST|IPN_FRAG)
254 #define IPN_FILTER 0x040
255 #define IPN_SPLIT 0x080
256 #define IPN_ROUNDR 0x100
257 #define IPN_NOTSRC 0x080000
258 #define IPN_NOTDST 0x100000
259 #define IPN_FRAG 0x200000
262 typedef struct natlog {
263 struct in_addr nl_origip;
264 struct in_addr nl_outip;
265 struct in_addr nl_inip;
277 #define NL_NEWMAP NAT_MAP
278 #define NL_NEWRDR NAT_REDIRECT
279 #define NL_NEWBIMAP NAT_BIMAP
280 #define NL_NEWBLOCK NAT_MAPBLK
281 #define NL_FLUSH 0xfffe
282 #define NL_EXPIRE 0xffff
284 #define NAT_HASH_FN(k,l,m) (((k) + ((k) >> 12) + l) % (m))
286 #define LONG_SUM(in) (((in) & 0xffff) + ((in) >> 16))
288 #define CALC_SUMD(s1, s2, sd) { \
289 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
290 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
292 (s1) = ((s1) & 0xffff) + ((s1) >> 16); \
293 (s2) = ((s2) & 0xffff) + ((s2) >> 16); \
294 /* Because ~1 == -2, We really need ~1 == -1 */ \
295 if ((s1) > (s2)) (s2)--; \
296 (sd) = (s2) - (s1); \
297 (sd) = ((sd) & 0xffff) + ((sd) >> 16); }
299 #define NAT_SYSSPACE 0x80000000
300 #define NAT_LOCKHELD 0x40000000
302 extern u_int ipf_nattable_sz;
303 extern u_int ipf_natrules_sz;
304 extern u_int ipf_rdrrules_sz;
305 extern int fr_nat_lock;
306 extern void ip_natsync (void *);
307 extern u_long fr_defnatage;
308 extern u_long fr_defnaticmpage;
309 extern nat_t **nat_table[2];
310 extern nat_t *nat_instances;
311 extern ipnat_t **nat_rules;
312 extern ipnat_t **rdr_rules;
313 extern ipnat_t *nat_list;
314 extern natstat_t nat_stats;
315 #if defined(__OpenBSD__)
316 extern void nat_ifdetach (void *);
318 #if defined(__DragonFly__) || defined(__NetBSD__) || defined(__OpenBSD__) || (__FreeBSD_version >= 300003)
319 extern int nat_ioctl (caddr_t, u_long, int);
321 extern int nat_ioctl (caddr_t, int, int);
323 extern int nat_init (void);
324 extern nat_t *nat_new (fr_info_t *, ip_t *, ipnat_t *, nat_t **,
326 extern nat_t *nat_outlookup (fr_info_t *, u_int, u_int, struct in_addr,
327 struct in_addr, int);
328 extern nat_t *nat_inlookup (fr_info_t *, u_int, u_int, struct in_addr,
329 struct in_addr, int);
330 extern nat_t *nat_lookupredir (natlookup_t *);
331 extern nat_t *nat_icmplookup (ip_t *, fr_info_t *, int);
332 extern nat_t *nat_icmp (ip_t *, fr_info_t *, u_int *, int);
333 extern int nat_clearlist (void);
334 extern void nat_insert (nat_t *);
336 extern int ip_natout (ip_t *, fr_info_t *);
337 extern int ip_natin (ip_t *, fr_info_t *);
338 extern void ip_natunload (void), ip_natexpire (void);
339 extern void nat_log (struct nat *, u_int);
340 extern void fix_incksum (fr_info_t *, u_short *, u_32_t);
341 extern void fix_outcksum (fr_info_t *, u_short *, u_32_t);
342 extern void fix_datacksum (u_short *, u_32_t);
344 #endif /* __IP_NAT_H__ */