1 /* $NetBSD: ipnat.c,v 1.4 2021/04/12 04:09:26 mrg Exp $ */
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) && !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__) || 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 #if __FreeBSD_version >= 300000
41 # include <net/if_var.h>
42 #endif
43 #include <netdb.h>
44 #include <arpa/nameser.h>
45 #include <arpa/inet.h>
46 #include <resolv.h>
47 #include <ctype.h>
48 #if defined(linux)
49 # include <linux/a.out.h>
50 #else
51 # include <nlist.h>
52 #endif
53 #include "ipf.h"
54 #include "netinet/ipl.h"
55 #include "kmem.h"
56
57 #ifdef __hpux
58 # define nlist nlist64
59 #endif
60
61 #if defined(sun) && !SOLARIS2
62 # define STRERROR(x) sys_errlist[x]
63 extern char *sys_errlist[];
64 #else
65 # define STRERROR(x) strerror(x)
66 #endif
67
68 #if !defined(lint)
69 static __attribute__((__used__)) const char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed";
70 static __attribute__((__used__)) const char rcsid[] = "@(#)Id: ipnat.c,v 1.1.1.2 2012/07/22 13:44:56 darrenr Exp $";
71 #endif
72
73
74 #if SOLARIS
75 #define bzero(a,b) memset(a,0,b)
76 #endif
77 int use_inet6 = 0;
78
79 extern char *optarg;
80
81 void dostats __P((int, natstat_t *, int, int, int *));
82 void dotable __P((natstat_t *, int, int, int, char *));
83 void flushtable __P((int, int, int *));
84 void usage __P((char *));
85 int main __P((int, char*[]));
86 void showhostmap __P((natstat_t *nsp));
87 void natstat_dead __P((natstat_t *, char *));
88 void dostats_live __P((int, natstat_t *, int, int *));
89 void showhostmap_dead __P((natstat_t *));
90 void showhostmap_live __P((int, natstat_t *));
91 void dostats_dead __P((natstat_t *, int, int *));
92 int nat_matcharray __P((nat_t *, int *));
93
94 int opts;
95 int nohdrfields = 0;
96 wordtab_t *nat_fields = NULL;
97
usage(name)98 void usage(name)
99 char *name;
100 {
101 fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
102 exit(1);
103 }
104
105
main(argc,argv)106 int main(argc, argv)
107 int argc;
108 char *argv[];
109 {
110 int fd, c, mode, *natfilter;
111 char *file, *core, *kernel;
112 natstat_t ns, *nsp;
113 ipfobj_t obj;
114
115 fd = -1;
116 opts = 0;
117 nsp = &ns;
118 file = NULL;
119 core = NULL;
120 kernel = NULL;
121 mode = O_RDWR;
122 natfilter = NULL;
123
124 assigndefined(getenv("IPNAT_PREDEFINED"));
125
126 while ((c = getopt(argc, argv, "CdFf:hlm:M:N:nO:prRsv")) != -1)
127 switch (c)
128 {
129 case 'C' :
130 opts |= OPT_CLEAR;
131 break;
132 case 'd' :
133 opts |= OPT_DEBUG;
134 break;
135 case 'f' :
136 file = optarg;
137 break;
138 case 'F' :
139 opts |= OPT_FLUSH;
140 break;
141 case 'h' :
142 opts |=OPT_HITS;
143 break;
144 case 'l' :
145 opts |= OPT_LIST;
146 mode = O_RDONLY;
147 break;
148 case 'm' :
149 natfilter = parseipfexpr(optarg, NULL);
150 break;
151 case 'M' :
152 core = optarg;
153 break;
154 case 'N' :
155 kernel = optarg;
156 break;
157 case 'n' :
158 opts |= OPT_DONOTHING|OPT_DONTOPEN;
159 mode = O_RDONLY;
160 break;
161 case 'O' :
162 nat_fields = parsefields(natfields, optarg);
163 break;
164 case 'p' :
165 opts |= OPT_PURGE;
166 break;
167 case 'R' :
168 opts |= OPT_NORESOLVE;
169 break;
170 case 'r' :
171 opts |= OPT_REMOVE;
172 break;
173 case 's' :
174 opts |= OPT_STAT;
175 mode = O_RDONLY;
176 break;
177 case 'v' :
178 opts |= OPT_VERBOSE;
179 break;
180 default :
181 usage(argv[0]);
182 }
183
184 if (((opts & OPT_PURGE) != 0) && ((opts & OPT_REMOVE) == 0)) {
185 (void) fprintf(stderr, "%s: -p must be used with -r\n",
186 argv[0]);
187 exit(1);
188 }
189
190 initparse();
191
192 if ((kernel != NULL) || (core != NULL)) {
193 (void) setgid(getgid());
194 (void) setuid(getuid());
195 }
196
197 if (!(opts & OPT_DONOTHING)) {
198 if (((fd = open(IPNAT_NAME, mode)) == -1) &&
199 ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
200 (void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
201 STRERROR(errno));
202 exit(1);
203 }
204 }
205
206 bzero((char *)&ns, sizeof(ns));
207
208 if ((opts & OPT_DONOTHING) == 0) {
209 if (checkrev(IPL_NAME) == -1) {
210 fprintf(stderr, "User/kernel version check failed\n");
211 exit(1);
212 }
213 }
214
215 if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
216 bzero((char *)&obj, sizeof(obj));
217 obj.ipfo_rev = IPFILTER_VERSION;
218 obj.ipfo_type = IPFOBJ_NATSTAT;
219 obj.ipfo_size = sizeof(*nsp);
220 obj.ipfo_ptr = (void *)nsp;
221 if (ioctl(fd, SIOCGNATS, &obj) == -1) {
222 ipferror(fd, "ioctl(SIOCGNATS)");
223 exit(1);
224 }
225 (void) setgid(getgid());
226 (void) setuid(getuid());
227 } else if ((kernel != NULL) || (core != NULL)) {
228 if (openkmem(kernel, core) == -1)
229 exit(1);
230
231 natstat_dead(nsp, kernel);
232 if (opts & (OPT_LIST|OPT_STAT))
233 dostats(fd, nsp, opts, 0, natfilter);
234 exit(0);
235 }
236
237 if (opts & (OPT_FLUSH|OPT_CLEAR))
238 flushtable(fd, opts, natfilter);
239 if (file) {
240 return ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
241 }
242 if (opts & (OPT_LIST|OPT_STAT))
243 dostats(fd, nsp, opts, 1, natfilter);
244 return 0;
245 }
246
247
248 /*
249 * Read NAT statistic information in using a symbol table and memory file
250 * rather than doing ioctl's.
251 */
natstat_dead(nsp,kernel)252 void natstat_dead(nsp, kernel)
253 natstat_t *nsp;
254 char *kernel;
255 {
256 struct nlist nat_nlist[10] = {
257 { "nat_table" }, /* 0 */
258 { "nat_list" },
259 { "maptable" },
260 { "ipf_nattable_sz" },
261 { "ipf_natrules_sz" },
262 { "ipf_rdrrules_sz" }, /* 5 */
263 { "ipf_hostmap_sz" },
264 { "nat_instances" },
265 { NULL }
266 };
267 void *tables[2];
268
269 if (nlist(kernel, nat_nlist) == -1) {
270 fprintf(stderr, "nlist error\n");
271 return;
272 }
273
274 /*
275 * Normally the ioctl copies all of these values into the structure
276 * for us, before returning it to userland, so here we must copy each
277 * one in individually.
278 */
279 kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
280 nsp->ns_side[0].ns_table = tables[0];
281 nsp->ns_side[1].ns_table = tables[1];
282
283 kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
284 sizeof(nsp->ns_list));
285 kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
286 sizeof(nsp->ns_maptable));
287 kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
288 sizeof(nsp->ns_nattab_sz));
289 kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
290 sizeof(nsp->ns_rultab_sz));
291 kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
292 sizeof(nsp->ns_rdrtab_sz));
293 kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
294 sizeof(nsp->ns_hostmap_sz));
295 kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
296 sizeof(nsp->ns_instances));
297 }
298
299
300 /*
301 * Issue an ioctl to flush either the NAT rules table or the active mapping
302 * table or both.
303 */
flushtable(fd,opts,match)304 void flushtable(fd, opts, match)
305 int fd, opts, *match;
306 {
307 int n = 0;
308
309 if (opts & OPT_FLUSH) {
310 n = 0;
311 if (!(opts & OPT_DONOTHING)) {
312 if (match != NULL) {
313 ipfobj_t obj;
314
315 obj.ipfo_rev = IPFILTER_VERSION;
316 obj.ipfo_size = match[0] * sizeof(int);
317 obj.ipfo_type = IPFOBJ_IPFEXPR;
318 obj.ipfo_ptr = match;
319 if (ioctl(fd, SIOCMATCHFLUSH, &obj) == -1) {
320 ipferror(fd, "ioctl(SIOCMATCHFLUSH)");
321 n = -1;
322 } else {
323 n = obj.ipfo_retval;
324 }
325 } else if (ioctl(fd, SIOCIPFFL, &n) == -1) {
326 ipferror(fd, "ioctl(SIOCIPFFL)");
327 n = -1;
328 }
329 }
330 if (n >= 0)
331 printf("%d entries flushed from NAT table\n", n);
332 }
333
334 if (opts & OPT_CLEAR) {
335 n = 1;
336 if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
337 ipferror(fd, "ioctl(SIOCCNATL)");
338 else
339 printf("%d entries flushed from NAT list\n", n);
340 }
341 }
342
343
344 /*
345 * Display NAT statistics.
346 */
dostats_dead(nsp,opts,filter)347 void dostats_dead(nsp, opts, filter)
348 natstat_t *nsp;
349 int opts, *filter;
350 {
351 nat_t *np, nat;
352 ipnat_t ipn;
353 int i;
354
355 if (nat_fields == NULL) {
356 printf("List of active MAP/Redirect filters:\n");
357 while (nsp->ns_list) {
358 if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
359 sizeof(ipn))) {
360 perror("kmemcpy");
361 break;
362 }
363 if (opts & OPT_HITS)
364 printf("%lu ", ipn.in_hits);
365 printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
366 nsp->ns_list = ipn.in_next;
367 }
368 }
369
370 if (nat_fields == NULL) {
371 printf("\nList of active sessions:\n");
372
373 } else if (nohdrfields == 0) {
374 for (i = 0; nat_fields[i].w_value != 0; i++) {
375 printfieldhdr(natfields, nat_fields + i);
376 if (nat_fields[i + 1].w_value != 0)
377 printf("\t");
378 }
379 printf("\n");
380 }
381
382 for (np = nsp->ns_instances; np; np = nat.nat_next) {
383 if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
384 break;
385 if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0))
386 continue;
387 if (nat_fields != NULL) {
388 for (i = 0; nat_fields[i].w_value != 0; i++) {
389 printnatfield(&nat, nat_fields[i].w_value);
390 if (nat_fields[i + 1].w_value != 0)
391 printf("\t");
392 }
393 printf("\n");
394 } else {
395 printactivenat(&nat, opts, nsp->ns_ticks);
396 if (nat.nat_aps) {
397 int proto;
398
399 if (nat.nat_dir & NAT_OUTBOUND)
400 proto = nat.nat_pr[1];
401 else
402 proto = nat.nat_pr[0];
403 printaps(nat.nat_aps, opts, proto);
404 }
405 }
406 }
407
408 if (opts & OPT_VERBOSE)
409 showhostmap_dead(nsp);
410 }
411
412
dotable(nsp,fd,alive,which,side)413 void dotable(nsp, fd, alive, which, side)
414 natstat_t *nsp;
415 int fd, alive, which;
416 char *side;
417 {
418 int sz, i, used, maxlen, minlen, totallen;
419 ipftable_t table;
420 u_int *buckets;
421 ipfobj_t obj;
422
423 sz = sizeof(*buckets) * nsp->ns_nattab_sz;
424 buckets = (u_int *)malloc(sz);
425 if (buckets == NULL) {
426 fprintf(stderr,
427 "cannot allocate memory (%d) for buckets\n", sz);
428 return;
429 }
430
431 obj.ipfo_rev = IPFILTER_VERSION;
432 obj.ipfo_type = IPFOBJ_GTABLE;
433 obj.ipfo_size = sizeof(table);
434 obj.ipfo_ptr = &table;
435
436 if (which == 0) {
437 table.ita_type = IPFTABLE_BUCKETS_NATIN;
438 } else if (which == 1) {
439 table.ita_type = IPFTABLE_BUCKETS_NATOUT;
440 }
441 table.ita_table = buckets;
442
443 if (alive) {
444 if (ioctl(fd, SIOCGTABL, &obj) != 0) {
445 ipferror(fd, "SIOCFTABL");
446 free(buckets);
447 return;
448 }
449 } else {
450 if (kmemcpy((char *)buckets, (u_long)nsp->ns_nattab_sz, sz)) {
451 free(buckets);
452 return;
453 }
454 }
455
456 minlen = nsp->ns_side[which].ns_inuse;
457 totallen = 0;
458 maxlen = 0;
459 used = 0;
460
461 for (i = 0; i < nsp->ns_nattab_sz; i++) {
462 if (buckets[i] > maxlen)
463 maxlen = buckets[i];
464 if (buckets[i] < minlen)
465 minlen = buckets[i];
466 if (buckets[i] != 0)
467 used++;
468 totallen += buckets[i];
469 }
470
471 printf("%d%%\thash efficiency %s\n",
472 totallen ? used * 100 / totallen : 0, side);
473 printf("%2.2f%%\tbucket usage %s\n",
474 ((float)used / nsp->ns_nattab_sz) * 100.0, side);
475 printf("%d\tminimal length %s\n", minlen, side);
476 printf("%d\tmaximal length %s\n", maxlen, side);
477 printf("%.3f\taverage length %s\n",
478 used ? ((float)totallen / used) : 0.0, side);
479
480 free(buckets);
481 }
482
483
dostats(fd,nsp,opts,alive,filter)484 void dostats(fd, nsp, opts, alive, filter)
485 natstat_t *nsp;
486 int fd, opts, alive, *filter;
487 {
488 /*
489 * Show statistics ?
490 */
491 if (opts & OPT_STAT) {
492 printnatside("in", &nsp->ns_side[0]);
493 dotable(nsp, fd, alive, 0, "in");
494
495 printnatside("out", &nsp->ns_side[1]);
496 dotable(nsp, fd, alive, 1, "out");
497
498 printf("%lu\tlog successes\n", nsp->ns_side[0].ns_log);
499 printf("%lu\tlog failures\n", nsp->ns_side[1].ns_log);
500 printf("%lu\tadded in\n%lu\tadded out\n",
501 nsp->ns_side[0].ns_added,
502 nsp->ns_side[1].ns_added);
503 printf("%u\tactive\n", nsp->ns_active);
504 printf("%lu\ttransparent adds\n", nsp->ns_addtrpnt);
505 printf("%lu\tdivert build\n", nsp->ns_divert_build);
506 printf("%lu\texpired\n", nsp->ns_expire);
507 printf("%lu\tflush all\n", nsp->ns_flush_all);
508 printf("%lu\tflush closing\n", nsp->ns_flush_closing);
509 printf("%lu\tflush queue\n", nsp->ns_flush_queue);
510 printf("%lu\tflush state\n", nsp->ns_flush_state);
511 printf("%lu\tflush timeout\n", nsp->ns_flush_timeout);
512 printf("%lu\thostmap new\n", nsp->ns_hm_new);
513 printf("%lu\thostmap fails\n", nsp->ns_hm_newfail);
514 printf("%lu\thostmap add\n", nsp->ns_hm_addref);
515 printf("%lu\thostmap NULL rule\n", nsp->ns_hm_nullnp);
516 printf("%lu\tlog ok\n", nsp->ns_log_ok);
517 printf("%lu\tlog fail\n", nsp->ns_log_fail);
518 printf("%u\torphan count\n", nsp->ns_orphans);
519 printf("%u\trule count\n", nsp->ns_rules);
520 printf("%u\tmap rules\n", nsp->ns_rules_map);
521 printf("%u\trdr rules\n", nsp->ns_rules_rdr);
522 printf("%u\twilds\n", nsp->ns_wilds);
523 if (opts & OPT_VERBOSE)
524 printf("list %p\n", nsp->ns_list);
525 }
526
527 if (opts & OPT_LIST) {
528 if (alive)
529 dostats_live(fd, nsp, opts, filter);
530 else
531 dostats_dead(nsp, opts, filter);
532 }
533 }
534
535
536 /*
537 * Display NAT statistics.
538 */
dostats_live(fd,nsp,opts,filter)539 void dostats_live(fd, nsp, opts, filter)
540 natstat_t *nsp;
541 int fd, opts, *filter;
542 {
543 ipfgeniter_t iter;
544 char buffer[2000];
545 ipfobj_t obj;
546 ipnat_t *ipn;
547 nat_t nat;
548 int i;
549
550 bzero((char *)&obj, sizeof(obj));
551 obj.ipfo_rev = IPFILTER_VERSION;
552 obj.ipfo_type = IPFOBJ_GENITER;
553 obj.ipfo_size = sizeof(iter);
554 obj.ipfo_ptr = &iter;
555
556 iter.igi_type = IPFGENITER_IPNAT;
557 iter.igi_nitems = 1;
558 iter.igi_data = buffer;
559 ipn = (ipnat_t *)buffer;
560
561 /*
562 * Show list of NAT rules and NAT sessions ?
563 */
564 if (nat_fields == NULL) {
565 printf("List of active MAP/Redirect filters:\n");
566 while (nsp->ns_list) {
567 if (ioctl(fd, SIOCGENITER, &obj) == -1)
568 break;
569 if (opts & OPT_HITS)
570 printf("%lu ", ipn->in_hits);
571 printnat(ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
572 nsp->ns_list = ipn->in_next;
573 }
574 }
575
576 if (nat_fields == NULL) {
577 printf("\nList of active sessions:\n");
578
579 } else if (nohdrfields == 0) {
580 for (i = 0; nat_fields[i].w_value != 0; i++) {
581 printfieldhdr(natfields, nat_fields + i);
582 if (nat_fields[i + 1].w_value != 0)
583 printf("\t");
584 }
585 printf("\n");
586 }
587
588 i = IPFGENITER_IPNAT;
589 (void) ioctl(fd,SIOCIPFDELTOK, &i);
590
591
592 iter.igi_type = IPFGENITER_NAT;
593 iter.igi_nitems = 1;
594 iter.igi_data = &nat;
595
596 while (nsp->ns_instances != NULL) {
597 if (ioctl(fd, SIOCGENITER, &obj) == -1)
598 break;
599 if ((filter != NULL) && (nat_matcharray(&nat, filter) == 0))
600 continue;
601 if (nat_fields != NULL) {
602 for (i = 0; nat_fields[i].w_value != 0; i++) {
603 printnatfield(&nat, nat_fields[i].w_value);
604 if (nat_fields[i + 1].w_value != 0)
605 printf("\t");
606 }
607 printf("\n");
608 } else {
609 printactivenat(&nat, opts, nsp->ns_ticks);
610 if (nat.nat_aps) {
611 int proto;
612
613 if (nat.nat_dir & NAT_OUTBOUND)
614 proto = nat.nat_pr[1];
615 else
616 proto = nat.nat_pr[0];
617 printaps(nat.nat_aps, opts, proto);
618 }
619 }
620 nsp->ns_instances = nat.nat_next;
621 }
622
623 if (opts & OPT_VERBOSE)
624 showhostmap_live(fd, nsp);
625
626 i = IPFGENITER_NAT;
627 (void) ioctl(fd,SIOCIPFDELTOK, &i);
628 }
629
630
631 /*
632 * Display the active host mapping table.
633 */
showhostmap_dead(nsp)634 void showhostmap_dead(nsp)
635 natstat_t *nsp;
636 {
637 hostmap_t hm, *hmp, **maptable;
638 u_int hv;
639
640 printf("\nList of active host mappings:\n");
641
642 maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
643 nsp->ns_hostmap_sz);
644 if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
645 sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
646 perror("kmemcpy (maptable)");
647 return;
648 }
649
650 for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
651 hmp = maptable[hv];
652
653 while (hmp) {
654 if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
655 perror("kmemcpy (hostmap)");
656 return;
657 }
658
659 printhostmap(&hm, hv);
660 hmp = hm.hm_next;
661 }
662 }
663 free(maptable);
664 }
665
666
667 /*
668 * Display the active host mapping table.
669 */
showhostmap_live(fd,nsp)670 void showhostmap_live(fd, nsp)
671 int fd;
672 natstat_t *nsp;
673 {
674 ipfgeniter_t iter;
675 hostmap_t hm;
676 ipfobj_t obj;
677 int i;
678
679 bzero((char *)&obj, sizeof(obj));
680 obj.ipfo_rev = IPFILTER_VERSION;
681 obj.ipfo_type = IPFOBJ_GENITER;
682 obj.ipfo_size = sizeof(iter);
683 obj.ipfo_ptr = &iter;
684
685 iter.igi_type = IPFGENITER_HOSTMAP;
686 iter.igi_nitems = 1;
687 iter.igi_data = &hm;
688
689 printf("\nList of active host mappings:\n");
690
691 while (nsp->ns_maplist != NULL) {
692 if (ioctl(fd, SIOCGENITER, &obj) == -1)
693 break;
694 printhostmap(&hm, hm.hm_hv);
695 nsp->ns_maplist = hm.hm_next;
696 }
697
698 i = IPFGENITER_HOSTMAP;
699 (void) ioctl(fd,SIOCIPFDELTOK, &i);
700 }
701
702
nat_matcharray(nat,array)703 int nat_matcharray(nat, array)
704 nat_t *nat;
705 int *array;
706 {
707 int i, n, *x, rv, p;
708 ipfexp_t *e;
709
710 rv = 0;
711 n = array[0];
712 x = array + 1;
713
714 for (; n > 0; x += 3 + x[3], rv = 0) {
715 e = (ipfexp_t *)x;
716 if (e->ipfe_cmd == IPF_EXP_END)
717 break;
718 n -= e->ipfe_size;
719
720 p = e->ipfe_cmd >> 16;
721 if ((p != 0) && (p != nat->nat_pr[1]))
722 break;
723
724 switch (e->ipfe_cmd)
725 {
726 case IPF_EXP_IP_PR :
727 for (i = 0; !rv && i < e->ipfe_narg; i++) {
728 rv |= (nat->nat_pr[1] == e->ipfe_arg0[i]);
729 }
730 break;
731
732 case IPF_EXP_IP_SRCADDR :
733 if (nat->nat_v[0] != 4)
734 break;
735 for (i = 0; !rv && i < e->ipfe_narg; i++) {
736 rv |= ((nat->nat_osrcaddr &
737 e->ipfe_arg0[i * 2 + 1]) ==
738 e->ipfe_arg0[i * 2]) ||
739 ((nat->nat_nsrcaddr &
740 e->ipfe_arg0[i * 2 + 1]) ==
741 e->ipfe_arg0[i * 2]);
742 }
743 break;
744
745 case IPF_EXP_IP_DSTADDR :
746 if (nat->nat_v[0] != 4)
747 break;
748 for (i = 0; !rv && i < e->ipfe_narg; i++) {
749 rv |= ((nat->nat_odstaddr &
750 e->ipfe_arg0[i * 2 + 1]) ==
751 e->ipfe_arg0[i * 2]) ||
752 ((nat->nat_ndstaddr &
753 e->ipfe_arg0[i * 2 + 1]) ==
754 e->ipfe_arg0[i * 2]);
755 }
756 break;
757
758 case IPF_EXP_IP_ADDR :
759 if (nat->nat_v[0] != 4)
760 break;
761 for (i = 0; !rv && i < e->ipfe_narg; i++) {
762 rv |= ((nat->nat_osrcaddr &
763 e->ipfe_arg0[i * 2 + 1]) ==
764 e->ipfe_arg0[i * 2]) ||
765 ((nat->nat_nsrcaddr &
766 e->ipfe_arg0[i * 2 + 1]) ==
767 e->ipfe_arg0[i * 2]) ||
768 ((nat->nat_odstaddr &
769 e->ipfe_arg0[i * 2 + 1]) ==
770 e->ipfe_arg0[i * 2]) ||
771 ((nat->nat_ndstaddr &
772 e->ipfe_arg0[i * 2 + 1]) ==
773 e->ipfe_arg0[i * 2]);
774 }
775 break;
776
777 #ifdef USE_INET6
778 case IPF_EXP_IP6_SRCADDR :
779 if (nat->nat_v[0] != 6)
780 break;
781 for (i = 0; !rv && i < e->ipfe_narg; i++) {
782 rv |= IP6_MASKEQ(&nat->nat_osrc6,
783 &e->ipfe_arg0[i * 8 + 4],
784 &e->ipfe_arg0[i * 8]) ||
785 IP6_MASKEQ(&nat->nat_nsrc6,
786 &e->ipfe_arg0[i * 8 + 4],
787 &e->ipfe_arg0[i * 8]);
788 }
789 break;
790
791 case IPF_EXP_IP6_DSTADDR :
792 if (nat->nat_v[0] != 6)
793 break;
794 for (i = 0; !rv && i < e->ipfe_narg; i++) {
795 rv |= IP6_MASKEQ(&nat->nat_odst6,
796 &e->ipfe_arg0[i * 8 + 4],
797 &e->ipfe_arg0[i * 8]) ||
798 IP6_MASKEQ(&nat->nat_ndst6,
799 &e->ipfe_arg0[i * 8 + 4],
800 &e->ipfe_arg0[i * 8]);
801 }
802 break;
803
804 case IPF_EXP_IP6_ADDR :
805 if (nat->nat_v[0] != 6)
806 break;
807 for (i = 0; !rv && i < e->ipfe_narg; i++) {
808 rv |= IP6_MASKEQ(&nat->nat_osrc6,
809 &e->ipfe_arg0[i * 8 + 4],
810 &e->ipfe_arg0[i * 8]) ||
811 IP6_MASKEQ(&nat->nat_nsrc6,
812 &e->ipfe_arg0[i * 8 + 4],
813 &e->ipfe_arg0[i * 8]) ||
814 IP6_MASKEQ(&nat->nat_odst6,
815 &e->ipfe_arg0[i * 8 + 4],
816 &e->ipfe_arg0[i * 8]) ||
817 IP6_MASKEQ(&nat->nat_ndst6,
818 &e->ipfe_arg0[i * 8 + 4],
819 &e->ipfe_arg0[i * 8]);
820 }
821 break;
822 #endif
823
824 case IPF_EXP_UDP_PORT :
825 case IPF_EXP_TCP_PORT :
826 for (i = 0; !rv && i < e->ipfe_narg; i++) {
827 rv |= (nat->nat_osport == e->ipfe_arg0[i]) ||
828 (nat->nat_nsport == e->ipfe_arg0[i]) ||
829 (nat->nat_odport == e->ipfe_arg0[i]) ||
830 (nat->nat_ndport == e->ipfe_arg0[i]);
831 }
832 break;
833
834 case IPF_EXP_UDP_SPORT :
835 case IPF_EXP_TCP_SPORT :
836 for (i = 0; !rv && i < e->ipfe_narg; i++) {
837 rv |= (nat->nat_osport == e->ipfe_arg0[i]) ||
838 (nat->nat_nsport == e->ipfe_arg0[i]);
839 }
840 break;
841
842 case IPF_EXP_UDP_DPORT :
843 case IPF_EXP_TCP_DPORT :
844 for (i = 0; !rv && i < e->ipfe_narg; i++) {
845 rv |= (nat->nat_odport == e->ipfe_arg0[i]) ||
846 (nat->nat_ndport == e->ipfe_arg0[i]);
847 }
848 break;
849 }
850 rv ^= e->ipfe_not;
851
852 if (rv == 0)
853 break;
854 }
855
856 return rv;
857 }
858