ipnat.c revision 369245 
1/*	$FreeBSD: stable/11/contrib/ipfilter/tools/ipnat.c 369245 2021-02-09 13:47:46Z git2svn $	*/
2
3/*
4 * Copyright (C) 2012 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
9 */
10#include <stdio.h>
11#include <string.h>
12#include <fcntl.h>
13#include <errno.h>
14#include <sys/types.h>
15#if !defined(__SVR4)
16#include <strings.h>
17#else
18#include <sys/byteorder.h>
19#endif
20#include <sys/time.h>
21#include <sys/param.h>
22#include <stdlib.h>
23#include <unistd.h>
24#include <stddef.h>
25#include <sys/file.h>
26#define _KERNEL
27#include <sys/uio.h>
28#undef _KERNEL
29#include <sys/socket.h>
30#include <sys/ioctl.h>
31#if defined(sun) && defined(__SVR4)
32# include <sys/ioccom.h>
33# include <sys/sysmacros.h>
34#endif
35#include <netinet/in.h>
36#include <netinet/in_systm.h>
37#include <netinet/ip.h>
38#include <netinet/tcp.h>
39#include <net/if.h>
40#include <netdb.h>
41#include <arpa/nameser.h>
42#include <arpa/inet.h>
43#include <resolv.h>
44#include <ctype.h>
45# include <nlist.h>
46#include "ipf.h"
47#include "netinet/ipl.h"
48#include "kmem.h"
49
50
51# define	STRERROR(x)	strerror(x)
52
53#if !defined(lint)
54static const char sccsid[] ="@(#)ipnat.c	1.9 6/5/96 (C) 1993 Darren Reed";
55static const char rcsid[] = "@(#)$Id$";
56#endif
57
58
59#if	SOLARIS
60#define	bzero(a,b)	memset(a,0,b)
61#endif
62int	use_inet6 = 0;
63
64extern	char	*optarg;
65
66void	dostats(int, natstat_t *, int, int, int *);
67void	dotable(natstat_t *, int, int, int, char *);
68void	flushtable(int, int, int *);
69void	usage(char *);
70int	main(int, char*[]);
71void	showhostmap(natstat_t *nsp);
72void	natstat_dead(natstat_t *, char *);
73void	dostats_live(int, natstat_t *, int, int *);
74void	showhostmap_dead(natstat_t *);
75void	showhostmap_live(int, natstat_t *);
76void	dostats_dead(natstat_t *, int, int *);
77int	nat_matcharray(nat_t *, int *);
78
79int		opts;
80int		nohdrfields = 0;
81wordtab_t	*nat_fields = NULL;
82
83void usage(name)
84	char *name;
85{
86	fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
87	exit(1);
88}
89
90
91int main(argc, argv)
92	int argc;
93	char *argv[];
94{
95	int fd, c, mode, *natfilter;
96	char *file, *core, *kernel;
97	natstat_t ns, *nsp;
98	ipfobj_t obj;
99
100	fd = -1;
101	opts = 0;
102	nsp = &ns;
103	file = NULL;
104	core = NULL;
105	kernel = NULL;
106	mode = O_RDWR;
107	natfilter = NULL;
108
109	assigndefined(getenv("IPNAT_PREDEFINED"));
110
111	while ((c = getopt(argc, argv, "CdFf:hlm:M:N:nO:prRsv")) != -1)
112		switch (c)
113		{
114		case 'C' :
115			opts |= OPT_CLEAR;
116			break;
117		case 'd' :
118			opts |= OPT_DEBUG;
119			break;
120		case 'f' :
121			file = optarg;
122			break;
123		case 'F' :
124			opts |= OPT_FLUSH;
125			break;
126		case 'h' :
127			opts |=OPT_HITS;
128			break;
129		case 'l' :
130			opts |= OPT_LIST;
131			mode = O_RDONLY;
132			break;
133		case 'm' :
134			natfilter = parseipfexpr(optarg, NULL);
135			break;
136		case 'M' :
137			core = optarg;
138			break;
139		case 'N' :
140			kernel = optarg;
141			break;
142		case 'n' :
143			opts |= OPT_DONOTHING|OPT_DONTOPEN;
144			mode = O_RDONLY;
145			break;
146		case 'O' :
147			nat_fields = parsefields(natfields, optarg);
148			break;
149		case 'p' :
150			opts |= OPT_PURGE;
151			break;
152		case 'R' :
153			opts |= OPT_NORESOLVE;
154			break;
155		case 'r' :
156			opts |= OPT_REMOVE;
157			break;
158		case 's' :
159			opts |= OPT_STAT;
160			mode = O_RDONLY;
161			break;
162		case 'v' :
163			opts |= OPT_VERBOSE;
164			break;
165		default :
166			usage(argv[0]);
167		}
168
169	if (((opts & OPT_PURGE) != 0) && ((opts & OPT_REMOVE) == 0)) {
170		(void) fprintf(stderr, "%s: -p must be used with -r\n",
171			       argv[0]);
172		exit(1);
173	}
174
175	initparse();
176
177	if ((kernel != NULL) || (core != NULL)) {
178		(void) setgid(getgid());
179		(void) setuid(getuid());
180	}
181
182	if (!(opts & OPT_DONOTHING)) {
183		if (((fd = open(IPNAT_NAME, mode)) == -1) &&
184		    ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
185			(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
186				STRERROR(errno));
187			exit(1);
188		}
189	}
190
191	bzero((char *)&ns, sizeof(ns));
192
193	if ((opts & OPT_DONOTHING) == 0) {
194		if (checkrev(IPL_NAME) == -1) {
195			fprintf(stderr, "User/kernel version check failed\n");
196			exit(1);
197		}
198	}
199
200	if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
201		bzero((char *)&obj, sizeof(obj));
202		obj.ipfo_rev = IPFILTER_VERSION;
203		obj.ipfo_type = IPFOBJ_NATSTAT;
204		obj.ipfo_size = sizeof(*nsp);
205		obj.ipfo_ptr = (void *)nsp;
206		if (ioctl(fd, SIOCGNATS, &obj) == -1) {
207			ipferror(fd, "ioctl(SIOCGNATS)");
208			exit(1);
209		}
210		(void) setgid(getgid());
211		(void) setuid(getuid());
212	} else if ((kernel != NULL) || (core != NULL)) {
213		if (openkmem(kernel, core) == -1)
214			exit(1);
215
216		natstat_dead(nsp, kernel);
217		if (opts & (OPT_LIST|OPT_STAT))
218			dostats(fd, nsp, opts, 0, natfilter);
219		exit(0);
220	}
221
222	if (opts & (OPT_FLUSH|OPT_CLEAR))
223		flushtable(fd, opts, natfilter);
224	if (file) {
225		return ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
226	}
227	if (opts & (OPT_LIST|OPT_STAT))
228		dostats(fd, nsp, opts, 1, natfilter);
229	return 0;
230}
231
232
233/*
234 * Read NAT statistic information in using a symbol table and memory file
235 * rather than doing ioctl's.
236 */
237void natstat_dead(nsp, kernel)
238	natstat_t *nsp;
239	char *kernel;
240{
241	struct nlist nat_nlist[10] = {
242		{ "nat_table" },		/* 0 */
243		{ "nat_list" },
244		{ "maptable" },
245		{ "ipf_nattable_sz" },
246		{ "ipf_natrules_sz" },
247		{ "ipf_rdrrules_sz" },		/* 5 */
248		{ "ipf_hostmap_sz" },
249		{ "nat_instances" },
250		{ NULL }
251	};
252	void *tables[2];
253
254	if (nlist(kernel, nat_nlist) == -1) {
255		fprintf(stderr, "nlist error\n");
256		return;
257	}
258
259	/*
260	 * Normally the ioctl copies all of these values into the structure
261	 * for us, before returning it to userland, so here we must copy each
262	 * one in individually.
263	 */
264	kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
265	nsp->ns_side[0].ns_table = tables[0];
266	nsp->ns_side[1].ns_table = tables[1];
267
268	kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
269		sizeof(nsp->ns_list));
270	kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
271		sizeof(nsp->ns_maptable));
272	kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
273		sizeof(nsp->ns_nattab_sz));
274	kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
275		sizeof(nsp->ns_rultab_sz));
276	kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
277		sizeof(nsp->ns_rdrtab_sz));
278	kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
279		sizeof(nsp->ns_hostmap_sz));
280	kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
281		sizeof(nsp->ns_instances));
282}
283
284
285/*
286 * Issue an ioctl to flush either the NAT rules table or the active mapping
287 * table or both.
288 */
289void flushtable(fd, opts, match)
290	int fd, opts, *match;
291{
292	int n = 0;
293
294	if (opts & OPT_FLUSH) {
295		n = 0;
296		if (!(opts & OPT_DONOTHING)) {
297			if (match != NULL) {
298				ipfobj_t obj;
299
300				obj.ipfo_rev = IPFILTER_VERSION;
301				obj.ipfo_size = match[0] * sizeof(int);
302				obj.ipfo_type = IPFOBJ_IPFEXPR;
303				obj.ipfo_ptr = match;
304				if (ioctl(fd, SIOCMATCHFLUSH, &obj) == -1) {
305					ipferror(fd, "ioctl(SIOCMATCHFLUSH)");
306					n = -1;
307				} else {
308					n = obj.ipfo_retval;
309				}
310			} else if (ioctl(fd, SIOCIPFFL, &n) == -1) {
311				ipferror(fd, "ioctl(SIOCIPFFL)");
312				n = -1;
313			}
314		}
315		if (n >= 0)
316			printf("%d entries flushed from NAT table\n", n);
317	}
318
319	if (opts & OPT_CLEAR) {
320		n = 1;
321		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
322			ipferror(fd, "ioctl(SIOCCNATL)");
323		else
324			printf("%d entries flushed from NAT list\n", n);
325	}
326}
327
328
329/*
330 * Display NAT statistics.
331 */
332void dostats_dead(nsp, opts, filter)
333	natstat_t *nsp;
334	int opts, *filter;
335{
336	nat_t *np, nat;
337	ipnat_t	ipn;
338	int i;
339
340	if (nat_fields == NULL) {
341		printf("List of active MAP/Redirect filters:\n");
342		while (nsp->ns_list) {
343			if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
344				    sizeof(ipn))) {
345				perror("kmemcpy");
346				break;
347			}
348			if (opts & OPT_HITS)
349				printf("%lu ", ipn.in_hits);
350			printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
351			nsp->ns_list = ipn.in_next;
352		}
353	}
354
355	if (nat_fields == NULL) {
356		printf("\nList of active sessions:\n");
357
358	} else if (nohdrfields == 0) {
359		for (i = 0; nat_fields[i].w_value != 0; i++) {
360			printfieldhdr(natfields, nat_fields + i);
361			if (nat_fields[i + 1].w_value != 0)
362				printf("\t");
363		}
364		printf("\n");
365	}
366
367	for (np = nsp->ns_instances; np; np = nat.nat_next) {
368		if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
369			break;
370		if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0))
371			continue;
372		if (nat_fields != NULL) {
373			for (i = 0; nat_fields[i].w_value != 0; i++) {
374				printnatfield(&nat, nat_fields[i].w_value);
375				if (nat_fields[i + 1].w_value != 0)
376					printf("\t");
377			}
378			printf("\n");
379		} else {
380			printactivenat(&nat, opts, nsp->ns_ticks);
381			if (nat.nat_aps) {
382				int proto;
383
384				if (nat.nat_dir & NAT_OUTBOUND)
385					proto = nat.nat_pr[1];
386				else
387					proto = nat.nat_pr[0];
388				printaps(nat.nat_aps, opts, proto);
389			}
390		}
391	}
392
393	if (opts & OPT_VERBOSE)
394		showhostmap_dead(nsp);
395}
396
397
398void dotable(nsp, fd, alive, which, side)
399	natstat_t *nsp;
400	int fd, alive, which;
401	char *side;
402{
403	int sz, i, used, maxlen, minlen, totallen;
404	ipftable_t table;
405	u_int *buckets;
406	ipfobj_t obj;
407
408	sz = sizeof(*buckets) * nsp->ns_nattab_sz;
409	buckets = (u_int *)malloc(sz);
410	if (buckets == NULL) {
411		fprintf(stderr,
412			"cannot allocate memory (%d) for buckets\n", sz);
413		return;
414	}
415
416	obj.ipfo_rev = IPFILTER_VERSION;
417	obj.ipfo_type = IPFOBJ_GTABLE;
418	obj.ipfo_size = sizeof(table);
419	obj.ipfo_ptr = &table;
420
421	if (which == 0) {
422		table.ita_type = IPFTABLE_BUCKETS_NATIN;
423	} else if (which == 1) {
424		table.ita_type = IPFTABLE_BUCKETS_NATOUT;
425	}
426	table.ita_table = buckets;
427
428	if (alive) {
429		if (ioctl(fd, SIOCGTABL, &obj) != 0) {
430			ipferror(fd, "SIOCFTABL");
431			free(buckets);
432			return;
433		}
434	} else {
435		if (kmemcpy((char *)buckets, (u_long)nsp->ns_nattab_sz, sz)) {
436			free(buckets);
437			return;
438		}
439	}
440
441	minlen = nsp->ns_side[which].ns_inuse;
442	totallen = 0;
443	maxlen = 0;
444	used = 0;
445
446	for (i = 0; i < nsp->ns_nattab_sz; i++) {
447		if (buckets[i] > maxlen)
448			maxlen = buckets[i];
449		if (buckets[i] < minlen)
450			minlen = buckets[i];
451		if (buckets[i] != 0)
452			used++;
453		totallen += buckets[i];
454	}
455
456	printf("%d%%\thash efficiency %s\n",
457	       totallen ? used * 100 / totallen : 0, side);
458	printf("%2.2f%%\tbucket usage %s\n",
459	       ((float)used / nsp->ns_nattab_sz) * 100.0, side);
460	printf("%d\tminimal length %s\n", minlen, side);
461	printf("%d\tmaximal length %s\n", maxlen, side);
462	printf("%.3f\taverage length %s\n",
463	       used ? ((float)totallen / used) : 0.0, side);
464
465	free(buckets);
466}
467
468
469void dostats(fd, nsp, opts, alive, filter)
470	natstat_t *nsp;
471	int fd, opts, alive, *filter;
472{
473	/*
474	 * Show statistics ?
475	 */
476	if (opts & OPT_STAT) {
477		printnatside("in", &nsp->ns_side[0]);
478		dotable(nsp, fd, alive, 0, "in");
479
480		printnatside("out", &nsp->ns_side[1]);
481		dotable(nsp, fd, alive, 1, "out");
482
483		printf("%lu\tlog successes\n", nsp->ns_side[0].ns_log);
484		printf("%lu\tlog failures\n", nsp->ns_side[1].ns_log);
485		printf("%lu\tadded in\n%lu\tadded out\n",
486			nsp->ns_side[0].ns_added,
487			nsp->ns_side[1].ns_added);
488		printf("%u\tactive\n", nsp->ns_active);
489		printf("%lu\ttransparent adds\n", nsp->ns_addtrpnt);
490		printf("%lu\tdivert build\n", nsp->ns_divert_build);
491		printf("%lu\texpired\n", nsp->ns_expire);
492		printf("%lu\tflush all\n", nsp->ns_flush_all);
493		printf("%lu\tflush closing\n", nsp->ns_flush_closing);
494		printf("%lu\tflush queue\n", nsp->ns_flush_queue);
495		printf("%lu\tflush state\n", nsp->ns_flush_state);
496		printf("%lu\tflush timeout\n", nsp->ns_flush_timeout);
497		printf("%lu\thostmap new\n", nsp->ns_hm_new);
498		printf("%lu\thostmap fails\n", nsp->ns_hm_newfail);
499		printf("%lu\thostmap add\n", nsp->ns_hm_addref);
500		printf("%lu\thostmap NULL rule\n", nsp->ns_hm_nullnp);
501		printf("%lu\tlog ok\n", nsp->ns_log_ok);
502		printf("%lu\tlog fail\n", nsp->ns_log_fail);
503		printf("%u\torphan count\n", nsp->ns_orphans);
504		printf("%u\trule count\n", nsp->ns_rules);
505		printf("%u\tmap rules\n", nsp->ns_rules_map);
506		printf("%u\trdr rules\n", nsp->ns_rules_rdr);
507		printf("%u\twilds\n", nsp->ns_wilds);
508		if (opts & OPT_VERBOSE)
509			printf("list %p\n", nsp->ns_list);
510	}
511
512	if (opts & OPT_LIST) {
513		if (alive)
514			dostats_live(fd, nsp, opts, filter);
515		else
516			dostats_dead(nsp, opts, filter);
517	}
518}
519
520
521/*
522 * Display NAT statistics.
523 */
524void dostats_live(fd, nsp, opts, filter)
525	natstat_t *nsp;
526	int fd, opts, *filter;
527{
528	ipfgeniter_t iter;
529	char buffer[2000];
530	ipfobj_t obj;
531	ipnat_t	*ipn;
532	nat_t nat;
533	int i;
534
535	bzero((char *)&obj, sizeof(obj));
536	obj.ipfo_rev = IPFILTER_VERSION;
537	obj.ipfo_type = IPFOBJ_GENITER;
538	obj.ipfo_size = sizeof(iter);
539	obj.ipfo_ptr = &iter;
540
541	iter.igi_type = IPFGENITER_IPNAT;
542	iter.igi_nitems = 1;
543	iter.igi_data = buffer;
544	ipn = (ipnat_t *)buffer;
545
546	/*
547	 * Show list of NAT rules and NAT sessions ?
548	 */
549	if (nat_fields == NULL) {
550		printf("List of active MAP/Redirect filters:\n");
551		while (nsp->ns_list) {
552			if (ioctl(fd, SIOCGENITER, &obj) == -1)
553				break;
554			if (opts & OPT_HITS)
555				printf("%lu ", ipn->in_hits);
556			printnat(ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
557			nsp->ns_list = ipn->in_next;
558		}
559	}
560
561	if (nat_fields == NULL) {
562		printf("\nList of active sessions:\n");
563
564	} else if (nohdrfields == 0) {
565		for (i = 0; nat_fields[i].w_value != 0; i++) {
566			printfieldhdr(natfields, nat_fields + i);
567			if (nat_fields[i + 1].w_value != 0)
568				printf("\t");
569		}
570		printf("\n");
571	}
572
573	i = IPFGENITER_IPNAT;
574	(void) ioctl(fd,SIOCIPFDELTOK, &i);
575
576
577	iter.igi_type = IPFGENITER_NAT;
578	iter.igi_nitems = 1;
579	iter.igi_data = &nat;
580
581	while (nsp->ns_instances != NULL) {
582		if (ioctl(fd, SIOCGENITER, &obj) == -1)
583			break;
584		if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0))
585			continue;
586		if (nat_fields != NULL) {
587			for (i = 0; nat_fields[i].w_value != 0; i++) {
588				printnatfield(&nat, nat_fields[i].w_value);
589				if (nat_fields[i + 1].w_value != 0)
590					printf("\t");
591			}
592			printf("\n");
593		} else {
594			printactivenat(&nat, opts, nsp->ns_ticks);
595			if (nat.nat_aps) {
596				int proto;
597
598				if (nat.nat_dir & NAT_OUTBOUND)
599					proto = nat.nat_pr[1];
600				else
601					proto = nat.nat_pr[0];
602				printaps(nat.nat_aps, opts, proto);
603			}
604		}
605		nsp->ns_instances = nat.nat_next;
606	}
607
608	if (opts & OPT_VERBOSE)
609		showhostmap_live(fd, nsp);
610
611	i = IPFGENITER_NAT;
612	(void) ioctl(fd,SIOCIPFDELTOK, &i);
613}
614
615
616/*
617 * Display the active host mapping table.
618 */
619void showhostmap_dead(nsp)
620	natstat_t *nsp;
621{
622	hostmap_t hm, *hmp, **maptable;
623	u_int hv;
624
625	printf("\nList of active host mappings:\n");
626
627	maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
628					nsp->ns_hostmap_sz);
629	if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
630		    sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
631		perror("kmemcpy (maptable)");
632		return;
633	}
634
635	for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
636		hmp = maptable[hv];
637
638		while (hmp) {
639			if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
640				perror("kmemcpy (hostmap)");
641				return;
642			}
643
644			printhostmap(&hm, hv);
645			hmp = hm.hm_next;
646		}
647	}
648	free(maptable);
649}
650
651
652/*
653 * Display the active host mapping table.
654 */
655void showhostmap_live(fd, nsp)
656	int fd;
657	natstat_t *nsp;
658{
659	ipfgeniter_t iter;
660	hostmap_t hm;
661	ipfobj_t obj;
662	int i;
663
664	bzero((char *)&obj, sizeof(obj));
665	obj.ipfo_rev = IPFILTER_VERSION;
666	obj.ipfo_type = IPFOBJ_GENITER;
667	obj.ipfo_size = sizeof(iter);
668	obj.ipfo_ptr = &iter;
669
670	iter.igi_type = IPFGENITER_HOSTMAP;
671	iter.igi_nitems = 1;
672	iter.igi_data = &hm;
673
674	printf("\nList of active host mappings:\n");
675
676	while (nsp->ns_maplist != NULL) {
677		if (ioctl(fd, SIOCGENITER, &obj) == -1)
678			break;
679		printhostmap(&hm, hm.hm_hv);
680		nsp->ns_maplist = hm.hm_next;
681	}
682
683	i = IPFGENITER_HOSTMAP;
684	(void) ioctl(fd,SIOCIPFDELTOK, &i);
685}
686
687
688int nat_matcharray(nat, array)
689	nat_t *nat;
690	int *array;
691{
692	int i, n, *x, rv, p;
693	ipfexp_t *e;
694
695	rv = 0;
696	n = array[0];
697	x = array + 1;
698
699	for (; n > 0; x += 3 + x[3], rv = 0) {
700		e = (ipfexp_t *)x;
701		if (e->ipfe_cmd == IPF_EXP_END)
702			break;
703		n -= e->ipfe_size;
704
705		p = e->ipfe_cmd >> 16;
706		if ((p != 0) && (p != nat->nat_pr[1]))
707			break;
708
709		switch (e->ipfe_cmd)
710		{
711		case IPF_EXP_IP_PR :
712			for (i = 0; !rv && i < e->ipfe_narg; i++) {
713				rv |= (nat->nat_pr[1] == e->ipfe_arg0[i]);
714			}
715			break;
716
717		case IPF_EXP_IP_SRCADDR :
718			if (nat->nat_v[0] != 4)
719				break;
720			for (i = 0; !rv && i < e->ipfe_narg; i++) {
721				rv |= ((nat->nat_osrcaddr &
722					e->ipfe_arg0[i * 2 + 1]) ==
723				       e->ipfe_arg0[i * 2]) ||
724				      ((nat->nat_nsrcaddr &
725					e->ipfe_arg0[i * 2 + 1]) ==
726				       e->ipfe_arg0[i * 2]);
727			}
728			break;
729
730		case IPF_EXP_IP_DSTADDR :
731			if (nat->nat_v[0] != 4)
732				break;
733			for (i = 0; !rv && i < e->ipfe_narg; i++) {
734				rv |= ((nat->nat_odstaddr &
735					e->ipfe_arg0[i * 2 + 1]) ==
736				       e->ipfe_arg0[i * 2]) ||
737				      ((nat->nat_ndstaddr &
738					e->ipfe_arg0[i * 2 + 1]) ==
739				       e->ipfe_arg0[i * 2]);
740			}
741			break;
742
743		case IPF_EXP_IP_ADDR :
744			if (nat->nat_v[0] != 4)
745				break;
746			for (i = 0; !rv && i < e->ipfe_narg; i++) {
747				rv |= ((nat->nat_osrcaddr &
748					e->ipfe_arg0[i * 2 + 1]) ==
749				       e->ipfe_arg0[i * 2]) ||
750				      ((nat->nat_nsrcaddr &
751					e->ipfe_arg0[i * 2 + 1]) ==
752				       e->ipfe_arg0[i * 2]) ||
753				     ((nat->nat_odstaddr &
754					e->ipfe_arg0[i * 2 + 1]) ==
755				       e->ipfe_arg0[i * 2]) ||
756				     ((nat->nat_ndstaddr &
757					e->ipfe_arg0[i * 2 + 1]) ==
758				       e->ipfe_arg0[i * 2]);
759			}
760			break;
761
762#ifdef USE_INET6
763		case IPF_EXP_IP6_SRCADDR :
764			if (nat->nat_v[0] != 6)
765				break;
766			for (i = 0; !rv && i < e->ipfe_narg; i++) {
767				rv |= IP6_MASKEQ(&nat->nat_osrc6,
768						 &e->ipfe_arg0[i * 8 + 4],
769						 &e->ipfe_arg0[i * 8]) ||
770				      IP6_MASKEQ(&nat->nat_nsrc6,
771						 &e->ipfe_arg0[i * 8 + 4],
772						 &e->ipfe_arg0[i * 8]);
773			}
774			break;
775
776		case IPF_EXP_IP6_DSTADDR :
777			if (nat->nat_v[0] != 6)
778				break;
779			for (i = 0; !rv && i < e->ipfe_narg; i++) {
780				rv |= IP6_MASKEQ(&nat->nat_odst6,
781						 &e->ipfe_arg0[i * 8 + 4],
782						 &e->ipfe_arg0[i * 8]) ||
783				      IP6_MASKEQ(&nat->nat_ndst6,
784						 &e->ipfe_arg0[i * 8 + 4],
785						 &e->ipfe_arg0[i * 8]);
786			}
787			break;
788
789		case IPF_EXP_IP6_ADDR :
790			if (nat->nat_v[0] != 6)
791				break;
792			for (i = 0; !rv && i < e->ipfe_narg; i++) {
793				rv |= IP6_MASKEQ(&nat->nat_osrc6,
794						 &e->ipfe_arg0[i * 8 + 4],
795						 &e->ipfe_arg0[i * 8]) ||
796				      IP6_MASKEQ(&nat->nat_nsrc6,
797						 &e->ipfe_arg0[i * 8 + 4],
798						 &e->ipfe_arg0[i * 8]) ||
799				      IP6_MASKEQ(&nat->nat_odst6,
800						 &e->ipfe_arg0[i * 8 + 4],
801						 &e->ipfe_arg0[i * 8]) ||
802				      IP6_MASKEQ(&nat->nat_ndst6,
803						 &e->ipfe_arg0[i * 8 + 4],
804						 &e->ipfe_arg0[i * 8]);
805			}
806			break;
807#endif
808
809		case IPF_EXP_UDP_PORT :
810		case IPF_EXP_TCP_PORT :
811			for (i = 0; !rv && i < e->ipfe_narg; i++) {
812				rv |= (nat->nat_osport == e->ipfe_arg0[i]) ||
813				      (nat->nat_nsport == e->ipfe_arg0[i]) ||
814				      (nat->nat_odport == e->ipfe_arg0[i]) ||
815				      (nat->nat_ndport == e->ipfe_arg0[i]);
816			}
817			break;
818
819		case IPF_EXP_UDP_SPORT :
820		case IPF_EXP_TCP_SPORT :
821			for (i = 0; !rv && i < e->ipfe_narg; i++) {
822				rv |= (nat->nat_osport == e->ipfe_arg0[i]) ||
823				      (nat->nat_nsport == e->ipfe_arg0[i]);
824			}
825			break;
826
827		case IPF_EXP_UDP_DPORT :
828		case IPF_EXP_TCP_DPORT :
829			for (i = 0; !rv && i < e->ipfe_narg; i++) {
830				rv |= (nat->nat_odport == e->ipfe_arg0[i]) ||
831				      (nat->nat_ndport == e->ipfe_arg0[i]);
832			}
833			break;
834		}
835		rv ^= e->ipfe_not;
836
837		if (rv == 0)
838			break;
839	}
840
841	return rv;
842}
843