projects / project / firewall3.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
iptables: free xtables_match if found in need_protomatch
[project/firewall3.git] / iptables.c
1 /*
2 * firewall3 - 3rd OpenWrt UCI firewall implementation
3 *
4 * Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
5 *
6 * Permission to use, copy, modify, and/or distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19 #define _GNU_SOURCE /* RTLD_NEXT */
20
21 /* include userspace headers */
22 #include <dlfcn.h>
23 #include <unistd.h>
24 #include <getopt.h>
25 #include <net/if.h>
26 #include <netinet/in.h>
27 #include <sys/utsname.h>
28 #include <sys/socket.h>
29
30 /* prevent indirect inclusion of kernel headers */
31 #define _LINUX_IF_H
32 #define _LINUX_IN_H
33 #define _LINUX_IN6_H
34
35 /* prevent libiptc from including kernel headers */
36 #define _FWCHAINS_KERNEL_HEADERS_H
37
38 /* finally include libiptc and xtables */
39 #include <libiptc/libiptc.h>
40 #include <libiptc/libip6tc.h>
41 #include <xtables.h>
42
43 #include <setjmp.h>
44
45 #include "options.h"
46
47 /* xtables interface */
48 #if (XTABLES_VERSION_CODE >= 10)
49 # include "xtables-10.h"
50 #elif (XTABLES_VERSION_CODE == 5)
51 # include "xtables-5.h"
52 #else
53 # error "Unsupported xtables version"
54 #endif
55
56 #include "iptables.h"
57
58 #define XT_LOCK_NAME "/var/run/xtables.lock"
59 static int xt_lock_fd = -1;
60
61 struct fw3_ipt_rule {
62 struct fw3_ipt_handle *h;
63
64 union {
65 struct ipt_entry e;
66 struct ip6t_entry e6;
67 };
68
69 struct xtables_rule_match *matches;
70 struct xtables_target *target;
71
72 int argc;
73 char **argv;
74
75 uint32_t protocol;
76 bool protocol_loaded;
77 };
78
79 static struct option base_opts[] = {
80 { .name = "match", .has_arg = 1, .val = 'm' },
81 { .name = "jump", .has_arg = 1, .val = 'j' },
82 { .name = "in-interface", .has_arg = 1, .val = 'i' },
83 { .name = "out-interface", .has_arg = 1, .val = 'o' },
84 { .name = "source", .has_arg = 1, .val = 's' },
85 { .name = "destination", .has_arg = 1, .val = 'd' },
86 { NULL }
87 };
88
89
90 static jmp_buf fw3_ipt_error_jmp;
91
92 static __attribute__((noreturn))
93 void fw3_ipt_error_handler(enum xtables_exittype status,
94 const char *fmt, ...)
95 {
96 va_list args;
97
98 fprintf(stderr, " ! Exception: ");
99
100 va_start(args, fmt);
101 vfprintf(stderr, fmt, args);
102 va_end(args);
103
104 longjmp(fw3_ipt_error_jmp, status);
105 }
106
107 static struct xtables_globals xtg = {
108 .option_offset = 0,
109 .program_version = "4",
110 .orig_opts = base_opts,
111 .exit_err = fw3_ipt_error_handler,
112 #if XTABLES_VERSION_CODE > 10
113 .compat_rev = xtables_compatible_revision,
114 #endif
115 };
116
117 static struct xtables_globals xtg6 = {
118 .option_offset = 0,
119 .program_version = "6",
120 .orig_opts = base_opts,
121 .exit_err = fw3_ipt_error_handler,
122 #if XTABLES_VERSION_CODE > 10
123 .compat_rev = xtables_compatible_revision,
124 #endif
125 };
126
127 static struct {
128 bool retain;
129 int mcount, tcount;
130 struct xtables_match **matches;
131 struct xtables_target **targets;
132 void (*register_match)(struct xtables_match *);
133 void (*register_target)(struct xtables_target *);
134 } xext;
135
136
137 /* Required by certain extensions like SNAT and DNAT */
138 int kernel_version = 0;
139
140 void
141 get_kernel_version(void)
142 {
143 static struct utsname uts;
144 int x = 3, y = 0, z = 0;
145
146 if (uname(&uts) != -1)
147 sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
148
149 kernel_version = 0x10000 * x + 0x100 * y + z;
150 }
151
152 static void fw3_init_extensions(void)
153 {
154 init_extensions();
155 init_extensions4();
156
157 #ifndef DISABLE_IPV6
158 init_extensions6();
159 #endif
160 }
161
162 struct fw3_ipt_handle *
163 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
164 {
165 int i;
166 struct fw3_ipt_handle *h;
167
168 h = fw3_alloc(sizeof(*h));
169
170 xtables_init();
171
172 while (!fw3_lock_path(&xt_lock_fd, XT_LOCK_NAME)) {
173 warn("Currently busy xtables.lock - wait 1 second");
174 sleep(1);
175 }
176
177 if (family == FW3_FAMILY_V6)
178 {
179 #ifndef DISABLE_IPV6
180 h->family = FW3_FAMILY_V6;
181 h->table = table;
182 h->handle = ip6tc_init(fw3_flag_names[table]);
183
184 xtables_set_params(&xtg6);
185 xtables_set_nfproto(NFPROTO_IPV6);
186 #endif
187 }
188 else
189 {
190 h->family = FW3_FAMILY_V4;
191 h->table = table;
192 h->handle = iptc_init(fw3_flag_names[table]);
193
194 xtables_set_params(&xtg);
195 xtables_set_nfproto(NFPROTO_IPV4);
196 }
197
198 if (!h->handle)
199 {
200 free(h);
201 fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
202 return NULL;
203 }
204
205 fw3_xt_reset();
206 fw3_init_extensions();
207
208 if (xext.register_match)
209 for (i = 0; i < xext.mcount; i++)
210 xext.register_match(xext.matches[i]);
211
212 if (xext.register_target)
213 for (i = 0; i < xext.tcount; i++)
214 xext.register_target(xext.targets[i]);
215
216 return h;
217 }
218
219 static void
220 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
221 {
222 va_list ap;
223
224 printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
225 fw3_flag_names[h->table]);
226
227 va_start(ap, fmt);
228 vprintf(fmt, ap);
229 va_end(ap);
230 }
231
232 void
233 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
234 enum fw3_flag policy)
235 {
236 if (fw3_pr_debug)
237 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
238
239 #ifndef DISABLE_IPV6
240 if (h->family == FW3_FAMILY_V6)
241 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
242 else
243 #endif
244 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
245 }
246
247 void
248 fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
249 {
250 if (fw3_pr_debug)
251 debug(h, "-F %s\n", chain);
252
253 #ifndef DISABLE_IPV6
254 if (h->family == FW3_FAMILY_V6)
255 ip6tc_flush_entries(chain, h->handle);
256 else
257 #endif
258 iptc_flush_entries(chain, h->handle);
259 }
260
261 static void
262 delete_rules(struct fw3_ipt_handle *h, const char *target)
263 {
264 unsigned int num;
265 const struct ipt_entry *e;
266 const char *chain;
267 const char *t;
268 bool found;
269
270 #ifndef DISABLE_IPV6
271 if (h->family == FW3_FAMILY_V6)
272 {
273 for (chain = ip6tc_first_chain(h->handle);
274 chain != NULL;
275 chain = ip6tc_next_chain(h->handle))
276 {
277 do {
278 found = false;
279
280 const struct ip6t_entry *e6;
281 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
282 e6 != NULL;
283 num++, e6 = ip6tc_next_rule(e6, h->handle))
284 {
285 t = ip6tc_get_target(e6, h->handle);
286
287 if (*t && !strcmp(t, target))
288 {
289 if (fw3_pr_debug)
290 debug(h, "-D %s %u\n", chain, num + 1);
291
292 ip6tc_delete_num_entry(chain, num, h->handle);
293 found = true;
294 break;
295 }
296 }
297 } while (found);
298 }
299 }
300 else
301 #endif
302 {
303 for (chain = iptc_first_chain(h->handle);
304 chain != NULL;
305 chain = iptc_next_chain(h->handle))
306 {
307 do {
308 found = false;
309
310 for (num = 0, e = iptc_first_rule(chain, h->handle);
311 e != NULL;
312 num++, e = iptc_next_rule(e, h->handle))
313 {
314 t = iptc_get_target(e, h->handle);
315
316 if (*t && !strcmp(t, target))
317 {
318 if (fw3_pr_debug)
319 debug(h, "-D %s %u\n", chain, num + 1);
320
321 iptc_delete_num_entry(chain, num, h->handle);
322 found = true;
323 break;
324 }
325 }
326 } while (found);
327 }
328 }
329 }
330
331 static bool
332 is_referenced(struct fw3_ipt_handle *h, const char *target)
333 {
334 const struct ipt_entry *e;
335 const char *chain;
336 const char *t;
337
338 #ifndef DISABLE_IPV6
339 if (h->family == FW3_FAMILY_V6)
340 {
341 for (chain = ip6tc_first_chain(h->handle);
342 chain != NULL;
343 chain = ip6tc_next_chain(h->handle))
344 {
345 const struct ip6t_entry *e6;
346 for (e6 = ip6tc_first_rule(chain, h->handle);
347 e6 != NULL;
348 e6 = ip6tc_next_rule(e6, h->handle))
349 {
350 t = ip6tc_get_target(e6, h->handle);
351
352 if (*t && !strcmp(t, target))
353 return true;
354 }
355 }
356 }
357 else
358 #endif
359 {
360 for (chain = iptc_first_chain(h->handle);
361 chain != NULL;
362 chain = iptc_next_chain(h->handle))
363 {
364 for (e = iptc_first_rule(chain, h->handle);
365 e != NULL;
366 e = iptc_next_rule(e, h->handle))
367 {
368 t = iptc_get_target(e, h->handle);
369
370 if (*t && !strcmp(t, target))
371 return true;
372 }
373 }
374 }
375
376 return false;
377 }
378
379 void
380 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, bool if_unused,
381 const char *chain)
382 {
383 if (if_unused && is_referenced(h, chain))
384 return;
385
386 delete_rules(h, chain);
387
388 if (fw3_pr_debug)
389 debug(h, "-X %s\n", chain);
390
391 #ifndef DISABLE_IPV6
392 if (h->family == FW3_FAMILY_V6)
393 ip6tc_delete_chain(chain, h->handle);
394 else
395 #endif
396 iptc_delete_chain(chain, h->handle);
397 }
398
399 static bool
400 has_rule_tag(const void *base, unsigned int start, unsigned int end)
401 {
402 unsigned int i;
403 const struct xt_entry_match *em;
404
405 for (i = start; i < end; i += em->u.match_size)
406 {
407 em = base + i;
408
409 if (strcmp(em->u.user.name, "comment"))
410 continue;
411
412 if (!memcmp(em->data, "!fw3", 4))
413 return true;
414 }
415
416 return false;
417 }
418
419 void
420 fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
421 {
422 unsigned int num;
423 const struct ipt_entry *e;
424 bool found;
425
426 #ifndef DISABLE_IPV6
427 if (h->family == FW3_FAMILY_V6)
428 {
429 if (!ip6tc_is_chain(chain, h->handle))
430 return;
431
432 do {
433 found = false;
434
435 const struct ip6t_entry *e6;
436 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
437 e6 != NULL;
438 num++, e6 = ip6tc_next_rule(e6, h->handle))
439 {
440 if (has_rule_tag(e6, sizeof(*e6), e6->target_offset))
441 {
442 if (fw3_pr_debug)
443 debug(h, "-D %s %u\n", chain, num + 1);
444
445 ip6tc_delete_num_entry(chain, num, h->handle);
446 found = true;
447 break;
448 }
449 }
450 } while (found);
451 }
452 else
453 #endif
454 {
455 if (!iptc_is_chain(chain, h->handle))
456 return;
457
458 do {
459 found = false;
460
461 for (num = 0, e = iptc_first_rule(chain, h->handle);
462 e != NULL;
463 num++, e = iptc_next_rule(e, h->handle))
464 {
465 if (has_rule_tag(e, sizeof(*e), e->target_offset))
466 {
467 if (fw3_pr_debug)
468 debug(h, "-D %s %u\n", chain, num + 1);
469
470 iptc_delete_num_entry(chain, num, h->handle);
471 found = true;
472 break;
473 }
474 }
475 } while (found);
476 }
477 }
478
479
480 static bool
481 is_chain(struct fw3_ipt_handle *h, const char *name)
482 {
483 #ifndef DISABLE_IPV6
484 if (h->family == FW3_FAMILY_V6)
485 return ip6tc_is_chain(name, h->handle);
486 else
487 #endif
488 return iptc_is_chain(name, h->handle);
489 }
490
491 void
492 fw3_ipt_create_chain(struct fw3_ipt_handle *h, bool ignore_existing,
493 const char *chain)
494 {
495 if (ignore_existing && is_chain(h, chain))
496 return;
497
498 if (fw3_pr_debug)
499 debug(h, "-N %s\n", chain);
500
501 iptc_create_chain(chain, h->handle);
502 }
503
504 void
505 fw3_ipt_flush(struct fw3_ipt_handle *h)
506 {
507 const char *chain;
508
509 #ifndef DISABLE_IPV6
510 if (h->family == FW3_FAMILY_V6)
511 {
512 for (chain = ip6tc_first_chain(h->handle);
513 chain != NULL;
514 chain = ip6tc_next_chain(h->handle))
515 {
516 ip6tc_flush_entries(chain, h->handle);
517 }
518
519 for (chain = ip6tc_first_chain(h->handle);
520 chain != NULL;
521 chain = ip6tc_next_chain(h->handle))
522 {
523 ip6tc_delete_chain(chain, h->handle);
524 }
525 }
526 else
527 #endif
528 {
529 for (chain = iptc_first_chain(h->handle);
530 chain != NULL;
531 chain = iptc_next_chain(h->handle))
532 {
533 iptc_flush_entries(chain, h->handle);
534 }
535
536 for (chain = iptc_first_chain(h->handle);
537 chain != NULL;
538 chain = iptc_next_chain(h->handle))
539 {
540 iptc_delete_chain(chain, h->handle);
541 }
542 }
543 }
544
545 static bool
546 chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
547 {
548 #ifndef DISABLE_IPV6
549 if (h->family == FW3_FAMILY_V6)
550 return (!ip6tc_builtin(chain, h->handle) &&
551 !ip6tc_first_rule(chain, h->handle));
552 #endif
553
554 return (!iptc_builtin(chain, h->handle) &&
555 !iptc_first_rule(chain, h->handle));
556 }
557
558 void
559 fw3_ipt_gc(struct fw3_ipt_handle *h)
560 {
561 const char *chain;
562 bool found;
563
564 #ifndef DISABLE_IPV6
565 if (h->family == FW3_FAMILY_V6)
566 {
567 do {
568 found = false;
569
570 for (chain = ip6tc_first_chain(h->handle);
571 chain != NULL;
572 chain = ip6tc_next_chain(h->handle))
573 {
574 if (!chain_is_empty(h, chain))
575 continue;
576
577 fw3_ipt_delete_chain(h, false, chain);
578 found = true;
579 break;
580 }
581 } while(found);
582 }
583 else
584 #endif
585 {
586 do {
587 found = false;
588
589 for (chain = iptc_first_chain(h->handle);
590 chain != NULL;
591 chain = iptc_next_chain(h->handle))
592 {
593 warn("C=%s\n", chain);
594
595 if (!chain_is_empty(h, chain))
596 continue;
597
598 warn("D=%s\n", chain);
599
600 fw3_ipt_delete_chain(h, false, chain);
601 found = true;
602 break;
603 }
604 } while (found);
605 }
606 }
607
608 void
609 fw3_ipt_commit(struct fw3_ipt_handle *h)
610 {
611 int rv;
612
613 #ifndef DISABLE_IPV6
614 if (h->family == FW3_FAMILY_V6)
615 {
616 rv = ip6tc_commit(h->handle);
617 if (!rv)
618 warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
619 }
620 else
621 #endif
622 {
623 rv = iptc_commit(h->handle);
624 if (!rv)
625 warn("iptc_commit(): %s", iptc_strerror(errno));
626 }
627 }
628
629 void
630 fw3_ipt_close(struct fw3_ipt_handle *h)
631 {
632 fw3_unlock_path(&xt_lock_fd, XT_LOCK_NAME);
633 free(h);
634 }
635
636 struct fw3_ipt_rule *
637 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
638 {
639 struct fw3_ipt_rule *r;
640
641 r = fw3_alloc(sizeof(*r));
642
643 r->h = h;
644 r->argv = fw3_alloc(sizeof(char *));
645 r->argv[r->argc++] = "fw3";
646
647 return r;
648 }
649
650
651 static char *
652 get_protoname(struct fw3_ipt_rule *r)
653 {
654 const struct xtables_pprot *pp;
655
656 if (r->protocol)
657 for (pp = xtables_chain_protos; pp->name; pp++)
658 if (pp->num == r->protocol)
659 return (char *)pp->name;
660
661 return NULL;
662 }
663
664 static struct xtables_match *
665 find_match(struct fw3_ipt_rule *r, const char *name)
666 {
667 struct xtables_match *m;
668
669 xext.retain = true;
670 m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
671 xext.retain = false;
672
673 return m;
674 }
675
676 static void
677 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
678 {
679 size_t s;
680 struct xtables_globals *g;
681
682 if (!m)
683 return;
684
685 s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
686
687 m->m = fw3_alloc(s);
688
689 fw3_xt_set_match_name(m);
690
691 m->m->u.user.revision = m->revision;
692 m->m->u.match_size = s;
693
694 /* free previous userspace data */
695 fw3_xt_free_match_udata(m);
696
697 if (m->init)
698 m->init(m->m);
699
700 /* don't merge options if no_clone is set and this match is a clone */
701 if (no_clone && (m == m->next))
702 return;
703
704 /* merge option table */
705 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
706 fw3_xt_merge_match_options(g, m);
707 }
708
709 static bool
710 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
711 {
712 struct xtables_match *match;
713
714 if (!pname)
715 return false;
716
717 match = xtables_find_match(pname, XTF_DONT_LOAD, NULL);
718 if (!match)
719 return true;
720
721 free(match);
722 return !r->protocol_loaded;
723 }
724
725 static struct xtables_match *
726 load_protomatch(struct fw3_ipt_rule *r)
727 {
728 const char *pname = get_protoname(r);
729
730 if (!need_protomatch(r, pname))
731 return NULL;
732
733 return find_match(r, pname);
734 }
735
736 static struct xtables_target *
737 find_target(struct fw3_ipt_rule *r, const char *name)
738 {
739 struct xtables_target *t;
740
741 xext.retain = true;
742
743 if (is_chain(r->h, name))
744 t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
745 else
746 t = xtables_find_target(name, XTF_TRY_LOAD);
747
748 xext.retain = false;
749
750 return t;
751 }
752
753 static struct xtables_target *
754 get_target(struct fw3_ipt_rule *r, const char *name)
755 {
756 size_t s;
757 struct xtables_target *t;
758 struct xtables_globals *g;
759
760 t = find_target(r, name);
761
762 if (!t)
763 return NULL;
764
765 s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
766 t->t = fw3_alloc(s);
767
768 fw3_xt_set_target_name(t, name);
769
770 t->t->u.user.revision = t->revision;
771 t->t->u.target_size = s;
772
773 /* free previous userspace data */
774 fw3_xt_free_target_udata(t);
775
776 if (t->init)
777 t->init(t->t);
778
779 /* merge option table */
780 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
781 fw3_xt_merge_target_options(g, t);
782
783 r->target = t;
784
785 return t;
786 }
787
788 void
789 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
790 {
791 uint32_t pr;
792
793 if (!proto || proto->any)
794 return;
795
796 pr = proto->protocol;
797
798 #ifndef DISABLE_IPV6
799 if (r->h->family == FW3_FAMILY_V6)
800 {
801 if (pr == 1)
802 pr = 58;
803
804 r->e6.ipv6.proto = pr;
805 r->e6.ipv6.flags |= IP6T_F_PROTO;
806
807 if (proto->invert)
808 r->e6.ipv6.invflags |= XT_INV_PROTO;
809 }
810 else
811 #endif
812 {
813 r->e.ip.proto = pr;
814
815 if (proto->invert)
816 r->e.ip.invflags |= XT_INV_PROTO;
817 }
818
819 r->protocol = pr;
820 }
821
822 void
823 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
824 struct fw3_device *in, struct fw3_device *out)
825 {
826 #ifndef DISABLE_IPV6
827 if (r->h->family == FW3_FAMILY_V6)
828 {
829 if (in && !in->any)
830 {
831 xtables_parse_interface(in->name, r->e6.ipv6.iniface,
832 r->e6.ipv6.iniface_mask);
833
834 if (in->invert)
835 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
836 }
837
838 if (out && !out->any)
839 {
840 xtables_parse_interface(out->name, r->e6.ipv6.outiface,
841 r->e6.ipv6.outiface_mask);
842
843 if (out->invert)
844 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
845 }
846 }
847 else
848 #endif
849 {
850 if (in && !in->any)
851 {
852 xtables_parse_interface(in->name, r->e.ip.iniface,
853 r->e.ip.iniface_mask);
854
855 if (in->invert)
856 r->e.ip.invflags |= IPT_INV_VIA_IN;
857 }
858
859 if (out && !out->any)
860 {
861 xtables_parse_interface(out->name, r->e.ip.outiface,
862 r->e.ip.outiface_mask);
863
864 if (out->invert)
865 r->e.ip.invflags |= IPT_INV_VIA_OUT;
866 }
867 }
868 }
869
870
871 void
872 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
873 struct fw3_address *src, struct fw3_address *dest)
874 {
875 if ((src && src->range) || (dest && dest->range))
876 {
877 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
878 }
879
880 if (src && src->set)
881 {
882 if (src->range)
883 {
884 fw3_ipt_rule_addarg(r, src->invert, "--src-range",
885 fw3_address_to_string(src, false, false));
886 }
887 #ifndef DISABLE_IPV6
888 else if (r->h->family == FW3_FAMILY_V6)
889 {
890 r->e6.ipv6.src = src->address.v6;
891 r->e6.ipv6.smsk = src->mask.v6;
892
893 int i;
894 for (i = 0; i < 4; i++)
895 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
896
897 if (src->invert)
898 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
899 }
900 #endif
901 else
902 {
903 r->e.ip.src = src->address.v4;
904 r->e.ip.smsk = src->mask.v4;
905
906 r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
907
908 if (src->invert)
909 r->e.ip.invflags |= IPT_INV_SRCIP;
910 }
911 }
912
913 if (dest && dest->set)
914 {
915 if (dest->range)
916 {
917 fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
918 fw3_address_to_string(dest, false, false));
919 }
920 #ifndef DISABLE_IPV6
921 else if (r->h->family == FW3_FAMILY_V6)
922 {
923 r->e6.ipv6.dst = dest->address.v6;
924 r->e6.ipv6.dmsk = dest->mask.v6;
925
926 int i;
927 for (i = 0; i < 4; i++)
928 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
929
930 if (dest->invert)
931 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
932 }
933 #endif
934 else
935 {
936 r->e.ip.dst = dest->address.v4;
937 r->e.ip.dmsk = dest->mask.v4;
938
939 r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
940
941 if (dest->invert)
942 r->e.ip.invflags |= IPT_INV_DSTIP;
943 }
944 }
945 }
946
947 void
948 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
949 struct fw3_port *sp, struct fw3_port *dp)
950 {
951 char buf[sizeof("65535:65535")];
952
953 if ((!sp || !sp->set) && (!dp || !dp->set))
954 return;
955
956 if (!get_protoname(r))
957 return;
958
959 if (sp && sp->set)
960 {
961 if (sp->port_min == sp->port_max)
962 snprintf(buf, sizeof(buf), "%u", sp->port_min);
963 else
964 snprintf(buf, sizeof(buf), "%u:%u", sp->port_min, sp->port_max);
965
966 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
967 }
968
969 if (dp && dp->set)
970 {
971 if (dp->port_min == dp->port_max)
972 snprintf(buf, sizeof(buf), "%u", dp->port_min);
973 else
974 snprintf(buf, sizeof(buf), "%u:%u", dp->port_min, dp->port_max);
975
976 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
977 }
978 }
979
980 void
981 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
982 {
983 struct fw3_device dev = { .any = false };
984
985 if (device) {
986 snprintf(dev.name, sizeof(dev.name), "%s", device);
987 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
988 }
989 }
990
991 void
992 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
993 {
994 char buf[sizeof("ff:ff:ff:ff:ff:ff")];
995 uint8_t *addr = mac->mac.ether_addr_octet;
996
997 if (!mac)
998 return;
999
1000 snprintf(buf, sizeof(buf), "%02x:%02x:%02x:%02x:%02x:%02x",
1001 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
1002
1003 fw3_ipt_rule_addarg(r, false, "-m", "mac");
1004 fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
1005 }
1006
1007 void
1008 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
1009 {
1010 char buf[sizeof("255/255")];
1011
1012 if (!icmp)
1013 return;
1014
1015 #ifndef DISABLE_IPV6
1016 if (r->h->family == FW3_FAMILY_V6)
1017 {
1018 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
1019 snprintf(buf, sizeof(buf), "%u", icmp->type6);
1020 else
1021 snprintf(buf, sizeof(buf), "%u/%u", icmp->type6, icmp->code6_min);
1022
1023 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
1024 }
1025 else
1026 #endif
1027 {
1028 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
1029 snprintf(buf, sizeof(buf), "%u", icmp->type);
1030 else
1031 snprintf(buf, sizeof(buf), "%u/%u", icmp->type, icmp->code_min);
1032
1033 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
1034 }
1035 }
1036
1037 void
1038 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
1039 {
1040 char buf[sizeof("-4294967296/second")];
1041
1042 if (!limit || limit->rate <= 0)
1043 return;
1044
1045 fw3_ipt_rule_addarg(r, false, "-m", "limit");
1046
1047 snprintf(buf, sizeof(buf), "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
1048 fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
1049
1050 if (limit->burst > 0)
1051 {
1052 snprintf(buf, sizeof(buf), "%u", limit->burst);
1053 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
1054 }
1055 }
1056
1057 void
1058 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
1059 {
1060 char buf[sizeof("dst,dst,dst")];
1061 char *p = buf;
1062 int i = 0, len;
1063 size_t rem = sizeof(buf);
1064
1065 struct fw3_ipset *set;
1066 struct fw3_ipset_datatype *type;
1067
1068 if (!match || !match->set || !match->ptr)
1069 return;
1070
1071 set = match->ptr;
1072 list_for_each_entry(type, &set->datatypes, list)
1073 {
1074 if (i >= 3)
1075 break;
1076
1077 if (p > buf) {
1078 if (rem <= 1)
1079 break;
1080
1081 *p++ = ',';
1082 *p = 0;
1083 rem--;
1084 }
1085
1086 len = snprintf(p, rem, "%s", match->dir[i] ? match->dir[i] : type->dir);
1087
1088 if (len < 0 || len >= rem)
1089 break;
1090
1091 rem -= len;
1092 p += len;
1093
1094 i++;
1095 }
1096
1097 fw3_ipt_rule_addarg(r, false, "-m", "set");
1098
1099 fw3_ipt_rule_addarg(r, match->invert, "--match-set",
1100 set->external ? set->external : set->name);
1101
1102 fw3_ipt_rule_addarg(r, false, buf, NULL);
1103 }
1104
1105 void
1106 fw3_ipt_rule_helper(struct fw3_ipt_rule *r, struct fw3_cthelpermatch *match)
1107 {
1108 if (!match || !match->set || !match->ptr)
1109 return;
1110
1111 fw3_ipt_rule_addarg(r, false, "-m", "helper");
1112 fw3_ipt_rule_addarg(r, match->invert, "--helper", match->ptr->name);
1113 }
1114
1115 void
1116 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
1117 {
1118 int i, len;
1119 struct tm empty = { 0 };
1120
1121 char buf[84]; /* sizeof("1,2,3,...,30,31") */
1122 char *p;
1123
1124 bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
1125 bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
1126
1127 size_t rem;
1128
1129 if (!d1 && !d2 && !time->timestart && !time->timestop &&
1130 !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
1131 {
1132 return;
1133 }
1134
1135 fw3_ipt_rule_addarg(r, false, "-m", "time");
1136
1137 if (!time->utc)
1138 fw3_ipt_rule_addarg(r, false, "--kerneltz", NULL);
1139
1140 if (d1)
1141 {
1142 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
1143 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
1144 }
1145
1146 if (d2)
1147 {
1148 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
1149 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
1150 }
1151
1152 if (time->timestart)
1153 {
1154 snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
1155 time->timestart / 3600,
1156 time->timestart % 3600 / 60,
1157 time->timestart % 60);
1158
1159 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
1160 }
1161
1162 if (time->timestop)
1163 {
1164 snprintf(buf, sizeof(buf), "%02d:%02d:%02d",
1165 time->timestop / 3600,
1166 time->timestop % 3600 / 60,
1167 time->timestop % 60);
1168
1169 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
1170 }
1171
1172 if (time->monthdays & 0xFFFFFFFE)
1173 {
1174 for (i = 1, p = buf, rem = sizeof(buf); i < 32; i++)
1175 {
1176 if (fw3_hasbit(time->monthdays, i))
1177 {
1178 if (p > buf) {
1179 if (rem <= 1)
1180 break;
1181
1182 *p++ = ',';
1183 *p = 0;
1184 rem--;
1185 }
1186
1187 len = snprintf(p, rem, "%u", i);
1188
1189 if (len < 0 || len >= rem)
1190 break;
1191
1192 rem -= len;
1193 p += len;
1194 }
1195 }
1196
1197 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
1198 }
1199
1200 if (time->weekdays & 0xFE)
1201 {
1202 for (i = 1, p = buf, rem = sizeof(buf); i < 8; i++)
1203 {
1204 if (fw3_hasbit(time->weekdays, i))
1205 {
1206 if (p > buf) {
1207 if (rem <= 1)
1208 break;
1209
1210 *p++ = ',';
1211 *p = 0;
1212 rem--;
1213 }
1214
1215 len = snprintf(p, rem, "%u", i);
1216
1217 if (len < 0 || len >= rem)
1218 break;
1219
1220 rem -= len;
1221 p += len;
1222 }
1223 }
1224
1225 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
1226 }
1227 }
1228
1229 void
1230 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
1231 {
1232 char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF")];
1233
1234 if (!mark || !mark->set)
1235 return;
1236
1237 if (mark->mask < 0xFFFFFFFF)
1238 snprintf(buf, sizeof(buf), "0x%x/0x%x", mark->mark, mark->mask);
1239 else
1240 snprintf(buf, sizeof(buf), "0x%x", mark->mark);
1241
1242 fw3_ipt_rule_addarg(r, false, "-m", "mark");
1243 fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
1244 }
1245
1246 void
1247 fw3_ipt_rule_dscp(struct fw3_ipt_rule *r, struct fw3_dscp *dscp)
1248 {
1249 char buf[sizeof("0xFF")];
1250
1251 if (!dscp || !dscp->set)
1252 return;
1253
1254 snprintf(buf, sizeof(buf), "0x%x", dscp->dscp);
1255
1256 fw3_ipt_rule_addarg(r, false, "-m", "dscp");
1257 fw3_ipt_rule_addarg(r, dscp->invert, "--dscp", buf);
1258 }
1259
1260 void
1261 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
1262 {
1263 va_list ap;
1264 char buf[256];
1265
1266 if (!fmt || !*fmt)
1267 return;
1268
1269 va_start(ap, fmt);
1270 vsnprintf(buf, sizeof(buf), fmt, ap);
1271 va_end(ap);
1272
1273 fw3_ipt_rule_addarg(r, false, "-m", "comment");
1274 fw3_ipt_rule_addarg(r, false, "--comment", buf);
1275 }
1276
1277 void
1278 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
1279 {
1280 char *p, **tmp, *s;
1281
1282 if (!extra || !*extra)
1283 return;
1284
1285 s = fw3_strdup(extra);
1286
1287 for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
1288 {
1289 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
1290
1291 if (!tmp)
1292 break;
1293
1294 r->argv = tmp;
1295 r->argv[r->argc++] = fw3_strdup(p);
1296 }
1297
1298 free(s);
1299 }
1300
1301 #ifndef DISABLE_IPV6
1302 static void
1303 rule_print6(struct ip6t_entry *e)
1304 {
1305 char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
1306 char *pname;
1307
1308 if (e->ipv6.flags & IP6T_F_PROTO)
1309 {
1310 if (e->ipv6.invflags & XT_INV_PROTO)
1311 printf(" !");
1312
1313 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
1314
1315 if (pname)
1316 printf(" -p %s", pname);
1317 else
1318 printf(" -p %u", e->ipv6.proto);
1319 }
1320
1321 if (e->ipv6.iniface[0])
1322 {
1323 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
1324 printf(" !");
1325
1326 printf(" -i %s", e->ipv6.iniface);
1327 }
1328
1329 if (e->ipv6.outiface[0])
1330 {
1331 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
1332 printf(" !");
1333
1334 printf(" -o %s", e->ipv6.outiface);
1335 }
1336
1337 if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1338 {
1339 if (e->ipv6.invflags & IP6T_INV_SRCIP)
1340 printf(" !");
1341
1342 printf(" -s %s/%s",
1343 inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
1344 inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
1345 }
1346
1347 if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1348 {
1349 if (e->ipv6.invflags & IP6T_INV_DSTIP)
1350 printf(" !");
1351
1352 printf(" -d %s/%s",
1353 inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
1354 inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
1355 }
1356 }
1357 #endif
1358
1359 static void
1360 rule_print4(struct ipt_entry *e)
1361 {
1362 struct in_addr in_zero = { 0 };
1363 char buf1[sizeof("255.255.255.255")], buf2[sizeof("255.255.255.255")];
1364 char *pname;
1365
1366 if (e->ip.proto)
1367 {
1368 if (e->ip.invflags & XT_INV_PROTO)
1369 printf(" !");
1370
1371 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1372
1373 if (pname)
1374 printf(" -p %s", pname);
1375 else
1376 printf(" -p %u", e->ip.proto);
1377 }
1378
1379 if (e->ip.iniface[0])
1380 {
1381 if (e->ip.invflags & IPT_INV_VIA_IN)
1382 printf(" !");
1383
1384 printf(" -i %s", e->ip.iniface);
1385 }
1386
1387 if (e->ip.outiface[0])
1388 {
1389 if (e->ip.invflags & IPT_INV_VIA_OUT)
1390 printf(" !");
1391
1392 printf(" -o %s", e->ip.outiface);
1393 }
1394
1395 if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1396 {
1397 if (e->ip.invflags & IPT_INV_SRCIP)
1398 printf(" !");
1399
1400 printf(" -s %s/%s",
1401 inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
1402 inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
1403 }
1404
1405 if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1406 {
1407 if (e->ip.invflags & IPT_INV_DSTIP)
1408 printf(" !");
1409
1410 printf(" -d %s/%s",
1411 inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
1412 inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
1413 }
1414 }
1415
1416 static void
1417 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
1418 {
1419 debug(r->h, "%s %s", prefix, chain);
1420
1421 #ifndef DISABLE_IPV6
1422 if (r->h->family == FW3_FAMILY_V6)
1423 rule_print6(&r->e6);
1424 else
1425 #endif
1426 rule_print4(&r->e);
1427
1428 fw3_xt_print_matches(&r->e.ip, r->matches);
1429 fw3_xt_print_target(&r->e.ip, r->target);
1430
1431 printf("\n");
1432 }
1433
1434 static bool
1435 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1436 {
1437 struct xtables_rule_match *m;
1438 struct xtables_match *em;
1439
1440 /* is a target option */
1441 if (r->target && fw3_xt_has_target_parse(r->target) &&
1442 optc >= r->target->option_offset &&
1443 optc < (r->target->option_offset + 256))
1444 {
1445 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1446 return false;
1447 }
1448
1449 /* try to dispatch argument to one of the match parsers */
1450 for (m = r->matches; m; m = m->next)
1451 {
1452 em = m->match;
1453
1454 if (m->completed || !fw3_xt_has_match_parse(em))
1455 continue;
1456
1457 if (optc < em->option_offset ||
1458 optc >= (em->option_offset + 256))
1459 continue;
1460
1461 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1462 return false;
1463 }
1464
1465 /* unhandled option, might belong to a protocol match */
1466 if ((em = load_protomatch(r)) != NULL)
1467 {
1468 init_match(r, em, false);
1469
1470 r->protocol_loaded = true;
1471 optind--;
1472
1473 return true;
1474 }
1475
1476 if (optc == ':')
1477 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
1478
1479 if (optc == '?')
1480 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
1481
1482 return false;
1483 }
1484
1485 void
1486 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1487 const char *k, const char *v)
1488 {
1489 int n;
1490 char **tmp;
1491
1492 if (!k)
1493 return;
1494
1495 n = inv + !!k + !!v;
1496 tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1497
1498 if (!tmp)
1499 return;
1500
1501 r->argv = tmp;
1502
1503 if (inv)
1504 r->argv[r->argc++] = fw3_strdup("!");
1505
1506 r->argv[r->argc++] = fw3_strdup(k);
1507
1508 if (v)
1509 r->argv[r->argc++] = fw3_strdup(v);
1510 }
1511
1512 static unsigned char *
1513 rule_mask(struct fw3_ipt_rule *r)
1514 {
1515 size_t s;
1516 unsigned char *p, *mask = NULL;
1517 struct xtables_rule_match *m;
1518
1519 #define SZ(x) XT_ALIGN(sizeof(struct x))
1520
1521 #ifndef DISABLE_IPV6
1522 if (r->h->family == FW3_FAMILY_V6)
1523 {
1524 s = SZ(ip6t_entry);
1525
1526 for (m = r->matches; m; m = m->next)
1527 s += SZ(ip6t_entry_match) + m->match->size;
1528
1529 s += SZ(ip6t_entry_target);
1530 if (r->target)
1531 s += r->target->size;
1532
1533 mask = fw3_alloc(s);
1534 memset(mask, 0xFF, SZ(ip6t_entry));
1535 p = mask + SZ(ip6t_entry);
1536
1537 for (m = r->matches; m; m = m->next)
1538 {
1539 memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
1540 p += SZ(ip6t_entry_match) + m->match->size;
1541 }
1542
1543 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target ? r->target->userspacesize : 0));
1544 }
1545 else
1546 #endif
1547 {
1548 s = SZ(ipt_entry);
1549
1550 for (m = r->matches; m; m = m->next)
1551 s += SZ(ipt_entry_match) + m->match->size;
1552
1553 s += SZ(ipt_entry_target);
1554 if (r->target)
1555 s += r->target->size;
1556
1557 mask = fw3_alloc(s);
1558 memset(mask, 0xFF, SZ(ipt_entry));
1559 p = mask + SZ(ipt_entry);
1560
1561 for (m = r->matches; m; m = m->next)
1562 {
1563 memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
1564 p += SZ(ipt_entry_match) + m->match->size;
1565 }
1566
1567 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target ? r->target->userspacesize : 0));
1568 }
1569
1570 return mask;
1571 }
1572
1573 static void *
1574 rule_build(struct fw3_ipt_rule *r)
1575 {
1576 size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
1577 struct xtables_rule_match *m;
1578
1579 #ifndef DISABLE_IPV6
1580 if (r->h->family == FW3_FAMILY_V6)
1581 {
1582 struct ip6t_entry *e6;
1583
1584 s = XT_ALIGN(sizeof(struct ip6t_entry));
1585
1586 for (m = r->matches; m; m = m->next)
1587 s += m->match->m->u.match_size;
1588
1589 e6 = fw3_alloc(s + target_size);
1590
1591 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1592
1593 e6->target_offset = s;
1594 e6->next_offset = s + target_size;
1595
1596 s = 0;
1597
1598 for (m = r->matches; m; m = m->next)
1599 {
1600 memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1601 s += m->match->m->u.match_size;
1602 }
1603
1604 if (target_size)
1605 memcpy(e6->elems + s, r->target->t, target_size);
1606
1607 return e6;
1608 }
1609 else
1610 #endif
1611 {
1612 struct ipt_entry *e;
1613
1614 s = XT_ALIGN(sizeof(struct ipt_entry));
1615
1616 for (m = r->matches; m; m = m->next)
1617 s += m->match->m->u.match_size;
1618
1619 e = fw3_alloc(s + target_size);
1620
1621 memcpy(e, &r->e, sizeof(struct ipt_entry));
1622
1623 e->target_offset = s;
1624 e->next_offset = s + target_size;
1625
1626 s = 0;
1627
1628 for (m = r->matches; m; m = m->next)
1629 {
1630 memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1631 s += m->match->m->u.match_size;
1632 }
1633
1634 if (target_size)
1635 memcpy(e->elems + s, r->target->t, target_size);
1636
1637 return e;
1638 }
1639 }
1640
1641 static void
1642 set_rule_tag(struct fw3_ipt_rule *r)
1643 {
1644 int i;
1645 char *p, **tmp;
1646 const char *tag = "!fw3";
1647
1648 for (i = 0; i < r->argc; i++)
1649 if (!strcmp(r->argv[i], "--comment") && (i + 1) < r->argc)
1650 if (asprintf(&p, "%s: %s", tag, r->argv[i + 1]) > 0)
1651 {
1652 free(r->argv[i + 1]);
1653 r->argv[i + 1] = p;
1654 return;
1655 }
1656
1657 tmp = realloc(r->argv, (r->argc + 4) * sizeof(*r->argv));
1658
1659 if (tmp)
1660 {
1661 r->argv = tmp;
1662 r->argv[r->argc++] = fw3_strdup("-m");
1663 r->argv[r->argc++] = fw3_strdup("comment");
1664 r->argv[r->argc++] = fw3_strdup("--comment");
1665 r->argv[r->argc++] = fw3_strdup(tag);
1666 }
1667 }
1668
1669 void
1670 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
1671 {
1672 void *rule;
1673 unsigned char *mask;
1674
1675 struct xtables_rule_match *m;
1676 struct xtables_match *em;
1677 struct xtables_target *et;
1678 struct xtables_globals *g;
1679
1680 struct fw3_device dev;
1681 struct fw3_address addr;
1682
1683 enum xtables_exittype status;
1684
1685 int i, optc;
1686 bool inv = false;
1687 char buf[32];
1688 va_list ap;
1689
1690 va_start(ap, fmt);
1691 vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1692 va_end(ap);
1693
1694 g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1695 g->opts = g->orig_opts;
1696
1697 optind = 0;
1698 opterr = 0;
1699
1700 status = setjmp(fw3_ipt_error_jmp);
1701
1702 if (status > 0)
1703 {
1704 info(" ! Skipping due to previous exception (code %u)", status);
1705 goto free;
1706 }
1707
1708 set_rule_tag(r);
1709
1710 while ((optc = getopt_long(r->argc, r->argv, "-:m:j:i:o:s:d:", g->opts,
1711 NULL)) != -1)
1712 {
1713 switch (optc)
1714 {
1715 case 'm':
1716 em = find_match(r, optarg);
1717
1718 if (!em)
1719 {
1720 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
1721 goto free;
1722 }
1723
1724 init_match(r, em, true);
1725 break;
1726
1727 case 'j':
1728 et = get_target(r, optarg);
1729
1730 if (!et)
1731 {
1732 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
1733 goto free;
1734 }
1735
1736 break;
1737
1738 case 'i':
1739 case 'o':
1740 if (!fw3_parse_device(&dev, optarg, false) ||
1741 dev.any || dev.invert || *dev.network)
1742 {
1743 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1744 goto free;
1745 }
1746
1747 dev.invert = inv;
1748 fw3_ipt_rule_in_out(r, (optc == 'i') ? &dev : NULL,
1749 (optc == 'o') ? &dev : NULL);
1750 break;
1751
1752 case 's':
1753 case 'd':
1754 if (!fw3_parse_address(&addr, optarg, false) ||
1755 addr.range || addr.invert)
1756 {
1757 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1758 goto free;
1759 }
1760
1761 addr.invert = inv;
1762 fw3_ipt_rule_src_dest(r, (optc == 's') ? &addr : NULL,
1763 (optc == 'd') ? &addr : NULL);
1764 break;
1765
1766 case 1:
1767 if ((optarg[0] == '!') && (optarg[1] == '\0'))
1768 {
1769 optarg[0] = '\0';
1770 inv = true;
1771 continue;
1772 }
1773
1774 warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1775 goto free;
1776
1777 default:
1778 if (parse_option(r, optc, inv))
1779 continue;
1780 break;
1781 }
1782
1783 inv = false;
1784 }
1785
1786 for (m = r->matches; m; m = m->next)
1787 xtables_option_mfcall(m->match);
1788
1789 if (r->target)
1790 xtables_option_tfcall(r->target);
1791
1792 rule = rule_build(r);
1793
1794 #ifndef DISABLE_IPV6
1795 if (r->h->family == FW3_FAMILY_V6)
1796 {
1797 if (repl)
1798 {
1799 mask = rule_mask(r);
1800
1801 while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
1802 if (fw3_pr_debug)
1803 rule_print(r, "-D", buf);
1804
1805 free(mask);
1806 }
1807
1808 if (fw3_pr_debug)
1809 rule_print(r, "-A", buf);
1810
1811 if (!ip6tc_append_entry(buf, rule, r->h->handle))
1812 warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
1813 }
1814 else
1815 #endif
1816 {
1817 if (repl)
1818 {
1819 mask = rule_mask(r);
1820
1821 while (iptc_delete_entry(buf, rule, mask, r->h->handle))
1822 if (fw3_pr_debug)
1823 rule_print(r, "-D", buf);
1824
1825 free(mask);
1826 }
1827
1828 if (fw3_pr_debug)
1829 rule_print(r, "-A", buf);
1830
1831 if (!iptc_append_entry(buf, rule, r->h->handle))
1832 warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
1833 }
1834
1835 free(rule);
1836
1837 free:
1838 for (i = 1; i < r->argc; i++)
1839 free(r->argv[i]);
1840
1841 free(r->argv);
1842
1843 xtables_rule_matches_free(&r->matches);
1844
1845 if (r->target)
1846 free(r->target->t);
1847
1848 free(r);
1849
1850 /* reset all targets and matches */
1851 for (em = xtables_matches; em; em = em->next)
1852 em->mflags = 0;
1853
1854 for (et = xtables_targets; et; et = et->next)
1855 {
1856 et->tflags = 0;
1857 et->used = 0;
1858 }
1859
1860 xtables_free_opts(1);
1861 }
1862
1863 struct fw3_ipt_rule *
1864 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1865 struct fw3_device *in, struct fw3_device *out,
1866 struct fw3_address *src, struct fw3_address *dest)
1867 {
1868 struct fw3_ipt_rule *r;
1869
1870 r = fw3_ipt_rule_new(handle);
1871
1872 fw3_ipt_rule_proto(r, proto);
1873 fw3_ipt_rule_in_out(r, in, out);
1874 fw3_ipt_rule_src_dest(r, src, dest);
1875
1876 return r;
1877 }
1878
1879 void
1880 xtables_register_match(struct xtables_match *me)
1881 {
1882 int i;
1883 static struct xtables_match **tmp;
1884
1885 if (!xext.register_match)
1886 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
1887
1888 if (!xext.register_match)
1889 return;
1890
1891 xext.register_match(me);
1892
1893 if (xext.retain)
1894 {
1895 for (i = 0; i < xext.mcount; i++)
1896 if (xext.matches[i] == me)
1897 return;
1898
1899 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
1900
1901 if (!tmp)
1902 return;
1903
1904 xext.matches = tmp;
1905 xext.matches[xext.mcount++] = me;
1906 }
1907 }
1908
1909 void
1910 xtables_register_target(struct xtables_target *me)
1911 {
1912 int i;
1913 static struct xtables_target **tmp;
1914
1915 if (!xext.register_target)
1916 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
1917
1918 if (!xext.register_target)
1919 return;
1920
1921 xext.register_target(me);
1922
1923 if (xext.retain)
1924 {
1925 for (i = 0; i < xext.tcount; i++)
1926 if (xext.targets[i] == me)
1927 return;
1928
1929 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
1930
1931 if (!tmp)
1932 return;
1933
1934 xext.targets = tmp;
1935 xext.targets[xext.tcount++] = me;
1936 }
1937 }
OpenWrt firewall configuration utility