xref: /freebsd/sbin/ipf/ipnat/ipnat.c (revision 1323ec57) 
1 /*	$FreeBSD$	*/
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)
54 static const char sccsid[] ="@(#)ipnat.c	1.9 6/5/96 (C) 1993 Darren Reed";
55 static const char rcsid[] = "@(#)$Id$";
56 #endif
57 
58 
59 #if	SOLARIS
60 #define	bzero(a,b)	memset(a,0,b)
61 #endif
62 int	use_inet6 = 0;
63 
64 extern	char	*optarg;
65 
66 void	dostats(int, natstat_t *, int, int, int *);
67 void	dotable(natstat_t *, int, int, int, char *);
68 void	flushtable(int, int, int *);
69 void	usage(char *);
70 int	main(int, char*[]);
71 void	showhostmap(natstat_t *nsp);
72 void	natstat_dead(natstat_t *, char *);
73 void	dostats_live(int, natstat_t *, int, int *);
74 void	showhostmap_dead(natstat_t *);
75 void	showhostmap_live(int, natstat_t *);
76 void	dostats_dead(natstat_t *, int, int *);
77 int	nat_matcharray(nat_t *, int *);
78 
79 int		opts;
80 int		nohdrfields = 0;
81 wordtab_t	*nat_fields = NULL;
82 
83 void
84 usage(char *name)
85 {
86 	fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
87 	exit(1);
88 }
89 
90 
91 int
92 main(int argc, char *argv[])
93 {
94 	int fd, c, mode, *natfilter;
95 	char *file, *core, *kernel;
96 	natstat_t ns, *nsp;
97 	ipfobj_t obj;
98 
99 	fd = -1;
100 	opts = 0;
101 	nsp = &ns;
102 	file = NULL;
103 	core = NULL;
104 	kernel = NULL;
105 	mode = O_RDWR;
106 	natfilter = NULL;
107 
108 	assigndefined(getenv("IPNAT_PREDEFINED"));
109 
110 	while ((c = getopt(argc, argv, "CdFf:hlm:M:N:nO:prRsv")) != -1)
111 		switch (c)
112 		{
113 		case 'C' :
114 			opts |= OPT_CLEAR;
115 			break;
116 		case 'd' :
117 			opts |= OPT_DEBUG;
118 			break;
119 		case 'f' :
120 			file = optarg;
121 			break;
122 		case 'F' :
123 			opts |= OPT_FLUSH;
124 			break;
125 		case 'h' :
126 			opts |=OPT_HITS;
127 			break;
128 		case 'l' :
129 			opts |= OPT_LIST;
130 			mode = O_RDONLY;
131 			break;
132 		case 'm' :
133 			natfilter = parseipfexpr(optarg, NULL);
134 			break;
135 		case 'M' :
136 			core = optarg;
137 			break;
138 		case 'N' :
139 			kernel = optarg;
140 			break;
141 		case 'n' :
142 			opts |= OPT_DONOTHING|OPT_DONTOPEN;
143 			mode = O_RDONLY;
144 			break;
145 		case 'O' :
146 			nat_fields = parsefields(natfields, optarg);
147 			break;
148 		case 'p' :
149 			opts |= OPT_PURGE;
150 			break;
151 		case 'R' :
152 			opts |= OPT_NORESOLVE;
153 			break;
154 		case 'r' :
155 			opts |= OPT_REMOVE;
156 			break;
157 		case 's' :
158 			opts |= OPT_STAT;
159 			mode = O_RDONLY;
160 			break;
161 		case 'v' :
162 			opts |= OPT_VERBOSE;
163 			break;
164 		default :
165 			usage(argv[0]);
166 		}
167 
168 	if (((opts & OPT_PURGE) != 0) && ((opts & OPT_REMOVE) == 0)) {
169 		(void) fprintf(stderr, "%s: -p must be used with -r\n",
170 			       argv[0]);
171 		exit(1);
172 	}
173 
174 	initparse();
175 
176 	if ((kernel != NULL) || (core != NULL)) {
177 		(void) setgid(getgid());
178 		(void) setuid(getuid());
179 	}
180 
181 	if (!(opts & OPT_DONOTHING)) {
182 		if (((fd = open(IPNAT_NAME, mode)) == -1) &&
183 		    ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
184 			(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
185 				STRERROR(errno));
186 			exit(1);
187 		}
188 	}
189 
190 	bzero((char *)&ns, sizeof(ns));
191 
192 	if ((opts & OPT_DONOTHING) == 0) {
193 		if (checkrev(IPL_NAME) == -1) {
194 			fprintf(stderr, "User/kernel version check failed\n");
195 			exit(1);
196 		}
197 	}
198 
199 	if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
200 		bzero((char *)&obj, sizeof(obj));
201 		obj.ipfo_rev = IPFILTER_VERSION;
202 		obj.ipfo_type = IPFOBJ_NATSTAT;
203 		obj.ipfo_size = sizeof(*nsp);
204 		obj.ipfo_ptr = (void *)nsp;
205 		if (ioctl(fd, SIOCGNATS, &obj) == -1) {
206 			ipferror(fd, "ioctl(SIOCGNATS)");
207 			exit(1);
208 		}
209 		(void) setgid(getgid());
210 		(void) setuid(getuid());
211 	} else if ((kernel != NULL) || (core != NULL)) {
212 		if (openkmem(kernel, core) == -1)
213 			exit(1);
214 
215 		natstat_dead(nsp, kernel);
216 		if (opts & (OPT_LIST|OPT_STAT))
217 			dostats(fd, nsp, opts, 0, natfilter);
218 		exit(0);
219 	}
220 
221 	if (opts & (OPT_FLUSH|OPT_CLEAR))
222 		flushtable(fd, opts, natfilter);
223 	if (file) {
224 		return (ipnat_parsefile(fd, ipnat_addrule, ioctl, file));
225 	}
226 	if (opts & (OPT_LIST|OPT_STAT))
227 		dostats(fd, nsp, opts, 1, natfilter);
228 	return (0);
229 }
230 
231 
232 /*
233  * Read NAT statistic information in using a symbol table and memory file
234  * rather than doing ioctl's.
235  */
236 void
237 natstat_dead(natstat_t *nsp, char *kernel)
238 {
239 	struct nlist nat_nlist[10] = {
240 		{ "nat_table" },		/* 0 */
241 		{ "nat_list" },
242 		{ "maptable" },
243 		{ "ipf_nattable_sz" },
244 		{ "ipf_natrules_sz" },
245 		{ "ipf_rdrrules_sz" },		/* 5 */
246 		{ "ipf_hostmap_sz" },
247 		{ "nat_instances" },
248 		{ NULL }
249 	};
250 	void *tables[2];
251 
252 	if (nlist(kernel, nat_nlist) == -1) {
253 		fprintf(stderr, "nlist error\n");
254 		return;
255 	}
256 
257 	/*
258 	 * Normally the ioctl copies all of these values into the structure
259 	 * for us, before returning it to userland, so here we must copy each
260 	 * one in individually.
261 	 */
262 	kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
263 	nsp->ns_side[0].ns_table = tables[0];
264 	nsp->ns_side[1].ns_table = tables[1];
265 
266 	kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
267 		sizeof(nsp->ns_list));
268 	kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
269 		sizeof(nsp->ns_maptable));
270 	kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
271 		sizeof(nsp->ns_nattab_sz));
272 	kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
273 		sizeof(nsp->ns_rultab_sz));
274 	kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
275 		sizeof(nsp->ns_rdrtab_sz));
276 	kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
277 		sizeof(nsp->ns_hostmap_sz));
278 	kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
279 		sizeof(nsp->ns_instances));
280 }
281 
282 
283 /*
284  * Issue an ioctl to flush either the NAT rules table or the active mapping
285  * table or both.
286  */
287 void
288 flushtable(int fd, int opts, int *match)
289 {
290 	int n = 0;
291 
292 	if (opts & OPT_FLUSH) {
293 		n = 0;
294 		if (!(opts & OPT_DONOTHING)) {
295 			if (match != NULL) {
296 				ipfobj_t obj;
297 
298 				obj.ipfo_rev = IPFILTER_VERSION;
299 				obj.ipfo_size = match[0] * sizeof(int);
300 				obj.ipfo_type = IPFOBJ_IPFEXPR;
301 				obj.ipfo_ptr = match;
302 				if (ioctl(fd, SIOCMATCHFLUSH, &obj) == -1) {
303 					ipferror(fd, "ioctl(SIOCMATCHFLUSH)");
304 					n = -1;
305 				} else {
306 					n = obj.ipfo_retval;
307 				}
308 			} else if (ioctl(fd, SIOCIPFFL, &n) == -1) {
309 				ipferror(fd, "ioctl(SIOCIPFFL)");
310 				n = -1;
311 			}
312 		}
313 		if (n >= 0)
314 			printf("%d entries flushed from NAT table\n", n);
315 	}
316 
317 	if (opts & OPT_CLEAR) {
318 		n = 1;
319 		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
320 			ipferror(fd, "ioctl(SIOCCNATL)");
321 		else
322 			printf("%d entries flushed from NAT list\n", n);
323 	}
324 }
325 
326 
327 /*
328  * Display NAT statistics.
329  */
330 void
331 dostats_dead(natstat_t *nsp, int opts, int *filter)
332 {
333 	nat_t *np, nat;
334 	ipnat_t	ipn;
335 	int i;
336 
337 	if (nat_fields == NULL) {
338 		printf("List of active MAP/Redirect filters:\n");
339 		while (nsp->ns_list) {
340 			if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
341 				    sizeof(ipn))) {
342 				perror("kmemcpy");
343 				break;
344 			}
345 			if (opts & OPT_HITS)
346 				printf("%lu ", ipn.in_hits);
347 			printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
348 			nsp->ns_list = ipn.in_next;
349 		}
350 	}
351 
352 	if (nat_fields == NULL) {
353 		printf("\nList of active sessions:\n");
354 
355 	} else if (nohdrfields == 0) {
356 		for (i = 0; nat_fields[i].w_value != 0; i++) {
357 			printfieldhdr(natfields, nat_fields + i);
358 			if (nat_fields[i + 1].w_value != 0)
359 				printf("\t");
360 		}
361 		printf("\n");
362 	}
363 
364 	for (np = nsp->ns_instances; np; np = nat.nat_next) {
365 		if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
366 			break;
367 		if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0))
368 			continue;
369 		if (nat_fields != NULL) {
370 			for (i = 0; nat_fields[i].w_value != 0; i++) {
371 				printnatfield(&nat, nat_fields[i].w_value);
372 				if (nat_fields[i + 1].w_value != 0)
373 					printf("\t");
374 			}
375 			printf("\n");
376 		} else {
377 			printactivenat(&nat, opts, nsp->ns_ticks);
378 			if (nat.nat_aps) {
379 				int proto;
380 
381 				if (nat.nat_dir & NAT_OUTBOUND)
382 					proto = nat.nat_pr[1];
383 				else
384 					proto = nat.nat_pr[0];
385 				printaps(nat.nat_aps, opts, proto);
386 			}
387 		}
388 	}
389 
390 	if (opts & OPT_VERBOSE)
391 		showhostmap_dead(nsp);
392 }
393 
394 
395 void
396 dotable(natstat_t *nsp, int fd, int alive, int which, char *side)
397 {
398 	int sz, i, used, maxlen, minlen, totallen;
399 	ipftable_t table;
400 	u_int *buckets;
401 	ipfobj_t obj;
402 
403 	sz = sizeof(*buckets) * nsp->ns_nattab_sz;
404 	buckets = (u_int *)malloc(sz);
405 	if (buckets == NULL) {
406 		fprintf(stderr,
407 			"cannot allocate memory (%d) for buckets\n", sz);
408 		return;
409 	}
410 
411 	obj.ipfo_rev = IPFILTER_VERSION;
412 	obj.ipfo_type = IPFOBJ_GTABLE;
413 	obj.ipfo_size = sizeof(table);
414 	obj.ipfo_ptr = &table;
415 
416 	if (which == 0) {
417 		table.ita_type = IPFTABLE_BUCKETS_NATIN;
418 	} else if (which == 1) {
419 		table.ita_type = IPFTABLE_BUCKETS_NATOUT;
420 	}
421 	table.ita_table = buckets;
422 
423 	if (alive) {
424 		if (ioctl(fd, SIOCGTABL, &obj) != 0) {
425 			ipferror(fd, "SIOCFTABL");
426 			free(buckets);
427 			return;
428 		}
429 	} else {
430 		if (kmemcpy((char *)buckets, (u_long)nsp->ns_nattab_sz, sz)) {
431 			free(buckets);
432 			return;
433 		}
434 	}
435 
436 	minlen = nsp->ns_side[which].ns_inuse;
437 	totallen = 0;
438 	maxlen = 0;
439 	used = 0;
440 
441 	for (i = 0; i < nsp->ns_nattab_sz; i++) {
442 		if (buckets[i] > maxlen)
443 			maxlen = buckets[i];
444 		if (buckets[i] < minlen)
445 			minlen = buckets[i];
446 		if (buckets[i] != 0)
447 			used++;
448 		totallen += buckets[i];
449 	}
450 
451 	printf("%d%%\thash efficiency %s\n",
452 	       totallen ? used * 100 / totallen : 0, side);
453 	printf("%2.2f%%\tbucket usage %s\n",
454 	       ((float)used / nsp->ns_nattab_sz) * 100.0, side);
455 	printf("%d\tminimal length %s\n", minlen, side);
456 	printf("%d\tmaximal length %s\n", maxlen, side);
457 	printf("%.3f\taverage length %s\n",
458 	       used ? ((float)totallen / used) : 0.0, side);
459 
460 	free(buckets);
461 }
462 
463 
464 void
465 dostats(int fd, natstat_t *nsp, int opts, int alive, int *filter)
466 {
467 	/*
468 	 * Show statistics ?
469 	 */
470 	if (opts & OPT_STAT) {
471 		printnatside("in", &nsp->ns_side[0]);
472 		dotable(nsp, fd, alive, 0, "in");
473 
474 		printnatside("out", &nsp->ns_side[1]);
475 		dotable(nsp, fd, alive, 1, "out");
476 
477 		printf("%lu\tlog successes\n", nsp->ns_side[0].ns_log);
478 		printf("%lu\tlog failures\n", nsp->ns_side[1].ns_log);
479 		printf("%lu\tadded in\n%lu\tadded out\n",
480 			nsp->ns_side[0].ns_added,
481 			nsp->ns_side[1].ns_added);
482 		printf("%u\tactive\n", nsp->ns_active);
483 		printf("%lu\ttransparent adds\n", nsp->ns_addtrpnt);
484 		printf("%lu\tdivert build\n", nsp->ns_divert_build);
485 		printf("%lu\texpired\n", nsp->ns_expire);
486 		printf("%lu\tflush all\n", nsp->ns_flush_all);
487 		printf("%lu\tflush closing\n", nsp->ns_flush_closing);
488 		printf("%lu\tflush queue\n", nsp->ns_flush_queue);
489 		printf("%lu\tflush state\n", nsp->ns_flush_state);
490 		printf("%lu\tflush timeout\n", nsp->ns_flush_timeout);
491 		printf("%lu\thostmap new\n", nsp->ns_hm_new);
492 		printf("%lu\thostmap fails\n", nsp->ns_hm_newfail);
493 		printf("%lu\thostmap add\n", nsp->ns_hm_addref);
494 		printf("%lu\thostmap NULL rule\n", nsp->ns_hm_nullnp);
495 		printf("%lu\tlog ok\n", nsp->ns_log_ok);
496 		printf("%lu\tlog fail\n", nsp->ns_log_fail);
497 		printf("%u\torphan count\n", nsp->ns_orphans);
498 		printf("%u\trule count\n", nsp->ns_rules);
499 		printf("%u\tmap rules\n", nsp->ns_rules_map);
500 		printf("%u\trdr rules\n", nsp->ns_rules_rdr);
501 		printf("%u\twilds\n", nsp->ns_wilds);
502 		if (opts & OPT_VERBOSE)
503 			printf("list %p\n", nsp->ns_list);
504 	}
505 
506 	if (opts & OPT_LIST) {
507 		if (alive)
508 			dostats_live(fd, nsp, opts, filter);
509 		else
510 			dostats_dead(nsp, opts, filter);
511 	}
512 }
513 
514 
515 /*
516  * Display NAT statistics.
517  */
518 void
519 dostats_live(int fd, natstat_t *nsp, int opts, int *filter)
520 {
521 	ipfgeniter_t iter;
522 	char buffer[2000];
523 	ipfobj_t obj;
524 	ipnat_t	*ipn;
525 	nat_t nat;
526 	int i;
527 
528 	bzero((char *)&obj, sizeof(obj));
529 	obj.ipfo_rev = IPFILTER_VERSION;
530 	obj.ipfo_type = IPFOBJ_GENITER;
531 	obj.ipfo_size = sizeof(iter);
532 	obj.ipfo_ptr = &iter;
533 
534 	iter.igi_type = IPFGENITER_IPNAT;
535 	iter.igi_nitems = 1;
536 	iter.igi_data = buffer;
537 	ipn = (ipnat_t *)buffer;
538 
539 	/*
540 	 * Show list of NAT rules and NAT sessions ?
541 	 */
542 	if (nat_fields == NULL) {
543 		printf("List of active MAP/Redirect filters:\n");
544 		while (nsp->ns_list) {
545 			if (ioctl(fd, SIOCGENITER, &obj) == -1)
546 				break;
547 			if (opts & OPT_HITS)
548 				printf("%lu ", ipn->in_hits);
549 			printnat(ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
550 			nsp->ns_list = ipn->in_next;
551 		}
552 	}
553 
554 	if (nat_fields == NULL) {
555 		printf("\nList of active sessions:\n");
556 
557 	} else if (nohdrfields == 0) {
558 		for (i = 0; nat_fields[i].w_value != 0; i++) {
559 			printfieldhdr(natfields, nat_fields + i);
560 			if (nat_fields[i + 1].w_value != 0)
561 				printf("\t");
562 		}
563 		printf("\n");
564 	}
565 
566 	i = IPFGENITER_IPNAT;
567 	(void) ioctl(fd,SIOCIPFDELTOK, &i);
568 
569 
570 	iter.igi_type = IPFGENITER_NAT;
571 	iter.igi_nitems = 1;
572 	iter.igi_data = &nat;
573 
574 	while (nsp->ns_instances != NULL) {
575 		if (ioctl(fd, SIOCGENITER, &obj) == -1)
576 			break;
577 		if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0))
578 			continue;
579 		if (nat_fields != NULL) {
580 			for (i = 0; nat_fields[i].w_value != 0; i++) {
581 				printnatfield(&nat, nat_fields[i].w_value);
582 				if (nat_fields[i + 1].w_value != 0)
583 					printf("\t");
584 			}
585 			printf("\n");
586 		} else {
587 			printactivenat(&nat, opts, nsp->ns_ticks);
588 			if (nat.nat_aps) {
589 				int proto;
590 
591 				if (nat.nat_dir & NAT_OUTBOUND)
592 					proto = nat.nat_pr[1];
593 				else
594 					proto = nat.nat_pr[0];
595 				printaps(nat.nat_aps, opts, proto);
596 			}
597 		}
598 		nsp->ns_instances = nat.nat_next;
599 	}
600 
601 	if (opts & OPT_VERBOSE)
602 		showhostmap_live(fd, nsp);
603 
604 	i = IPFGENITER_NAT;
605 	(void) ioctl(fd,SIOCIPFDELTOK, &i);
606 }
607 
608 
609 /*
610  * Display the active host mapping table.
611  */
612 void
613 showhostmap_dead(natstat_t *nsp)
614 {
615 	hostmap_t hm, *hmp, **maptable;
616 	u_int hv;
617 
618 	printf("\nList of active host mappings:\n");
619 
620 	maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
621 					nsp->ns_hostmap_sz);
622 	if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
623 		    sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
624 		perror("kmemcpy (maptable)");
625 		return;
626 	}
627 
628 	for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
629 		hmp = maptable[hv];
630 
631 		while (hmp) {
632 			if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
633 				perror("kmemcpy (hostmap)");
634 				return;
635 			}
636 
637 			printhostmap(&hm, hv);
638 			hmp = hm.hm_next;
639 		}
640 	}
641 	free(maptable);
642 }
643 
644 
645 /*
646  * Display the active host mapping table.
647  */
648 void
649 showhostmap_live(int fd, natstat_t *nsp)
650 {
651 	ipfgeniter_t iter;
652 	hostmap_t hm;
653 	ipfobj_t obj;
654 	int i;
655 
656 	bzero((char *)&obj, sizeof(obj));
657 	obj.ipfo_rev = IPFILTER_VERSION;
658 	obj.ipfo_type = IPFOBJ_GENITER;
659 	obj.ipfo_size = sizeof(iter);
660 	obj.ipfo_ptr = &iter;
661 
662 	iter.igi_type = IPFGENITER_HOSTMAP;
663 	iter.igi_nitems = 1;
664 	iter.igi_data = &hm;
665 
666 	printf("\nList of active host mappings:\n");
667 
668 	while (nsp->ns_maplist != NULL) {
669 		if (ioctl(fd, SIOCGENITER, &obj) == -1)
670 			break;
671 		printhostmap(&hm, hm.hm_hv);
672 		nsp->ns_maplist = hm.hm_next;
673 	}
674 
675 	i = IPFGENITER_HOSTMAP;
676 	(void) ioctl(fd,SIOCIPFDELTOK, &i);
677 }
678 
679 
680 int
681 nat_matcharray(nat_t *nat, int *array)
682 {
683 	int i, n, *x, rv, p;
684 	ipfexp_t *e;
685 
686 	rv = 0;
687 	n = array[0];
688 	x = array + 1;
689 
690 	for (; n > 0; x += 3 + x[3], rv = 0) {
691 		e = (ipfexp_t *)x;
692 		if (e->ipfe_cmd == IPF_EXP_END)
693 			break;
694 		n -= e->ipfe_size;
695 
696 		p = e->ipfe_cmd >> 16;
697 		if ((p != 0) && (p != nat->nat_pr[1]))
698 			break;
699 
700 		switch (e->ipfe_cmd)
701 		{
702 		case IPF_EXP_IP_PR :
703 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
704 				rv |= (nat->nat_pr[1] == e->ipfe_arg0[i]);
705 			}
706 			break;
707 
708 		case IPF_EXP_IP_SRCADDR :
709 			if (nat->nat_v[0] != 4)
710 				break;
711 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
712 				rv |= ((nat->nat_osrcaddr &
713 					e->ipfe_arg0[i * 2 + 1]) ==
714 				       e->ipfe_arg0[i * 2]) ||
715 				      ((nat->nat_nsrcaddr &
716 					e->ipfe_arg0[i * 2 + 1]) ==
717 				       e->ipfe_arg0[i * 2]);
718 			}
719 			break;
720 
721 		case IPF_EXP_IP_DSTADDR :
722 			if (nat->nat_v[0] != 4)
723 				break;
724 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
725 				rv |= ((nat->nat_odstaddr &
726 					e->ipfe_arg0[i * 2 + 1]) ==
727 				       e->ipfe_arg0[i * 2]) ||
728 				      ((nat->nat_ndstaddr &
729 					e->ipfe_arg0[i * 2 + 1]) ==
730 				       e->ipfe_arg0[i * 2]);
731 			}
732 			break;
733 
734 		case IPF_EXP_IP_ADDR :
735 			if (nat->nat_v[0] != 4)
736 				break;
737 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
738 				rv |= ((nat->nat_osrcaddr &
739 					e->ipfe_arg0[i * 2 + 1]) ==
740 				       e->ipfe_arg0[i * 2]) ||
741 				      ((nat->nat_nsrcaddr &
742 					e->ipfe_arg0[i * 2 + 1]) ==
743 				       e->ipfe_arg0[i * 2]) ||
744 				     ((nat->nat_odstaddr &
745 					e->ipfe_arg0[i * 2 + 1]) ==
746 				       e->ipfe_arg0[i * 2]) ||
747 				     ((nat->nat_ndstaddr &
748 					e->ipfe_arg0[i * 2 + 1]) ==
749 				       e->ipfe_arg0[i * 2]);
750 			}
751 			break;
752 
753 #ifdef USE_INET6
754 		case IPF_EXP_IP6_SRCADDR :
755 			if (nat->nat_v[0] != 6)
756 				break;
757 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
758 				rv |= IP6_MASKEQ(&nat->nat_osrc6,
759 						 &e->ipfe_arg0[i * 8 + 4],
760 						 &e->ipfe_arg0[i * 8]) ||
761 				      IP6_MASKEQ(&nat->nat_nsrc6,
762 						 &e->ipfe_arg0[i * 8 + 4],
763 						 &e->ipfe_arg0[i * 8]);
764 			}
765 			break;
766 
767 		case IPF_EXP_IP6_DSTADDR :
768 			if (nat->nat_v[0] != 6)
769 				break;
770 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
771 				rv |= IP6_MASKEQ(&nat->nat_odst6,
772 						 &e->ipfe_arg0[i * 8 + 4],
773 						 &e->ipfe_arg0[i * 8]) ||
774 				      IP6_MASKEQ(&nat->nat_ndst6,
775 						 &e->ipfe_arg0[i * 8 + 4],
776 						 &e->ipfe_arg0[i * 8]);
777 			}
778 			break;
779 
780 		case IPF_EXP_IP6_ADDR :
781 			if (nat->nat_v[0] != 6)
782 				break;
783 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
784 				rv |= IP6_MASKEQ(&nat->nat_osrc6,
785 						 &e->ipfe_arg0[i * 8 + 4],
786 						 &e->ipfe_arg0[i * 8]) ||
787 				      IP6_MASKEQ(&nat->nat_nsrc6,
788 						 &e->ipfe_arg0[i * 8 + 4],
789 						 &e->ipfe_arg0[i * 8]) ||
790 				      IP6_MASKEQ(&nat->nat_odst6,
791 						 &e->ipfe_arg0[i * 8 + 4],
792 						 &e->ipfe_arg0[i * 8]) ||
793 				      IP6_MASKEQ(&nat->nat_ndst6,
794 						 &e->ipfe_arg0[i * 8 + 4],
795 						 &e->ipfe_arg0[i * 8]);
796 			}
797 			break;
798 #endif
799 
800 		case IPF_EXP_UDP_PORT :
801 		case IPF_EXP_TCP_PORT :
802 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
803 				rv |= (nat->nat_osport == e->ipfe_arg0[i]) ||
804 				      (nat->nat_nsport == e->ipfe_arg0[i]) ||
805 				      (nat->nat_odport == e->ipfe_arg0[i]) ||
806 				      (nat->nat_ndport == e->ipfe_arg0[i]);
807 			}
808 			break;
809 
810 		case IPF_EXP_UDP_SPORT :
811 		case IPF_EXP_TCP_SPORT :
812 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
813 				rv |= (nat->nat_osport == e->ipfe_arg0[i]) ||
814 				      (nat->nat_nsport == e->ipfe_arg0[i]);
815 			}
816 			break;
817 
818 		case IPF_EXP_UDP_DPORT :
819 		case IPF_EXP_TCP_DPORT :
820 			for (i = 0; !rv && i < e->ipfe_narg; i++) {
821 				rv |= (nat->nat_odport == e->ipfe_arg0[i]) ||
822 				      (nat->nat_ndport == e->ipfe_arg0[i]);
823 			}
824 			break;
825 		}
826 		rv ^= e->ipfe_not;
827 
828 		if (rv == 0)
829 			break;
830 	}
831 
832 	return (rv);
833 }
834