redurects: add support to define multiple zones for dnat reflection rules
[project/firewall3.git] / redirects.c
1 /*
2 * firewall3 - 3rd OpenWrt UCI firewall implementation
3 *
4 * Copyright (C) 2013-2018 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 #include "redirects.h"
20
21
22 const struct fw3_option fw3_redirect_opts[] = {
23 FW3_OPT("enabled", bool, redirect, enabled),
24
25 FW3_OPT("name", string, redirect, name),
26 FW3_OPT("family", family, redirect, family),
27
28 FW3_OPT("src", device, redirect, src),
29 FW3_OPT("dest", device, redirect, dest),
30
31 FW3_OPT("ipset", setmatch, redirect, ipset),
32 FW3_OPT("helper", cthelper, redirect, helper),
33
34 FW3_LIST("proto", protocol, redirect, proto),
35
36 FW3_OPT("src_ip", network, redirect, ip_src),
37 FW3_LIST("src_mac", mac, redirect, mac_src),
38 FW3_OPT("src_port", port, redirect, port_src),
39
40 FW3_OPT("src_dip", network, redirect, ip_dest),
41 FW3_OPT("src_dport", port, redirect, port_dest),
42
43 FW3_OPT("dest_ip", network, redirect, ip_redir),
44 FW3_OPT("dest_port", port, redirect, port_redir),
45
46 FW3_OPT("extra", string, redirect, extra),
47
48 FW3_OPT("limit", limit, redirect, limit),
49 FW3_OPT("limit_burst", int, redirect, limit.burst),
50
51 FW3_OPT("utc_time", bool, redirect, time.utc),
52 FW3_OPT("start_date", date, redirect, time.datestart),
53 FW3_OPT("stop_date", date, redirect, time.datestop),
54 FW3_OPT("start_time", time, redirect, time.timestart),
55 FW3_OPT("stop_time", time, redirect, time.timestop),
56 FW3_OPT("weekdays", weekdays, redirect, time.weekdays),
57 FW3_OPT("monthdays", monthdays, redirect, time.monthdays),
58
59 FW3_OPT("mark", mark, redirect, mark),
60
61 FW3_OPT("reflection", bool, redirect, reflection),
62 FW3_OPT("reflection_src", reflection_source,
63 redirect, reflection_src),
64 FW3_LIST("reflection_zone", device, redirect, reflection_zones),
65
66 FW3_OPT("target", target, redirect, target),
67
68 { }
69 };
70
71
72 static bool
73 check_families(struct uci_element *e, struct fw3_redirect *r)
74 {
75 if (r->family == FW3_FAMILY_ANY)
76 return true;
77
78 if (r->_src && r->_src->family && r->_src->family != r->family)
79 {
80 warn_elem(e, "refers to source zone with different family");
81 return false;
82 }
83
84 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
85 {
86 warn_elem(e, "refers to destination zone with different family");
87 return false;
88 }
89
90 if (r->ipset.ptr && r->ipset.ptr->family &&
91 r->ipset.ptr->family != r->family)
92 {
93 warn_elem(e, "refers to ipset with different family");
94 return false;
95 }
96
97 if (r->helper.ptr && r->helper.ptr->family &&
98 r->helper.ptr->family != r->family)
99 {
100 warn_elem(e, "refers to CT helper not supporting family");
101 return false;
102 }
103
104 if (r->ip_src.family && r->ip_src.family != r->family)
105 {
106 warn_elem(e, "uses source ip with different family");
107 return false;
108 }
109
110 if (r->ip_dest.family && r->ip_dest.family != r->family)
111 {
112 warn_elem(e, "uses destination ip with different family");
113 return false;
114 }
115
116 if (r->ip_redir.family && r->ip_redir.family != r->family)
117 {
118 warn_elem(e, "uses redirect ip with different family");
119 return false;
120 }
121
122 return true;
123 }
124
125 static bool
126 compare_addr(struct fw3_address *a, struct fw3_address *b)
127 {
128 if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
129 return false;
130
131 return ((a->address.v4.s_addr & a->mask.v4.s_addr) ==
132 (b->address.v4.s_addr & a->mask.v4.s_addr));
133 }
134
135 static bool
136 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
137 struct fw3_state *state)
138 {
139 struct fw3_zone *zone;
140 struct fw3_address *addr;
141 struct list_head *addrs;
142
143 if (!redir->ip_redir.set)
144 return false;
145
146 list_for_each_entry(zone, &state->zones, list)
147 {
148 addrs = fw3_resolve_zone_addresses(zone, NULL);
149
150 if (!addrs)
151 continue;
152
153 list_for_each_entry(addr, addrs, list)
154 {
155 if (!compare_addr(addr, &redir->ip_redir))
156 continue;
157
158 strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name) - 1);
159 redir->dest.set = true;
160 redir->_dest = zone;
161
162 break;
163 }
164
165 fw3_free_list(addrs);
166
167 if (redir->_dest)
168 return true;
169 }
170
171 return false;
172 }
173
174 static bool
175 check_local(struct uci_element *e, struct fw3_redirect *redir,
176 struct fw3_state *state)
177 {
178 if (redir->target != FW3_FLAG_DNAT)
179 return false;
180
181 if (!redir->ip_redir.set)
182 redir->local = true;
183
184 return redir->local;
185 }
186
187 static void
188 select_helper(struct fw3_state *state, struct fw3_redirect *redir)
189 {
190 struct fw3_protocol *proto;
191 struct fw3_cthelper *helper;
192 int n_matches = 0;
193
194 if (!state->defaults.auto_helper)
195 return;
196
197 if (!redir->_src || redir->target != FW3_FLAG_DNAT)
198 return;
199
200 if (!redir->port_redir.set || redir->port_redir.invert)
201 return;
202
203 if (redir->helper.set || redir->helper.ptr)
204 return;
205
206 if (list_empty(&redir->proto))
207 return;
208
209 list_for_each_entry(proto, &redir->proto, list)
210 {
211 helper = fw3_lookup_cthelper_by_proto_port(state, proto, &redir->port_redir);
212
213 if (helper)
214 n_matches++;
215 }
216
217 if (n_matches != 1)
218 return;
219
220 /* store pointer to auto-selected helper but set ".set" flag to false,
221 * to allow later code to decide between configured or auto-selected
222 * helpers */
223 redir->helper.set = false;
224 redir->helper.ptr = helper;
225
226 set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
227 }
228
229 static bool
230 check_redirect(struct fw3_state *state, struct fw3_redirect *redir, struct uci_element *e)
231 {
232 bool valid;
233
234 if (!redir->enabled)
235 return false;
236
237 if (redir->src.invert)
238 {
239 warn_section("redirect", redir, e, "must not have an inverted source");
240 return false;
241 }
242 else if (redir->src.set && !redir->src.any &&
243 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
244 {
245 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
246 redir->src.name);
247 return false;
248 }
249 else if (redir->dest.set && !redir->dest.any &&
250 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
251 {
252 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
253 redir->dest.name);
254 return false;
255 }
256 else if (redir->ipset.set && state->disable_ipsets)
257 {
258 warn_section("redirect", redir, e, "skipped due to disabled ipset support");
259 return false;
260 }
261 else if (redir->ipset.set &&
262 !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
263 {
264 warn_section("redirect", redir, e, "refers to unknown ipset '%s'",
265 redir->ipset.name);
266 return false;
267 }
268 else if (redir->helper.set &&
269 !(redir->helper.ptr = fw3_lookup_cthelper(state, redir->helper.name)))
270 {
271 warn_section("redirect", redir, e, "refers to unknown CT helper '%s'",
272 redir->helper.name);
273 return false;
274 }
275
276 if (!check_families(e, redir))
277 return false;
278
279 if (redir->target == FW3_FLAG_UNSPEC)
280 {
281 warn_section("redirect", redir, e, "has no target specified, defaulting to DNAT");
282 redir->target = FW3_FLAG_DNAT;
283 }
284 else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
285 {
286 warn_section("redirect", redir, e, "has invalid target specified, defaulting to DNAT");
287 redir->target = FW3_FLAG_DNAT;
288 }
289
290 valid = false;
291
292 if (redir->target == FW3_FLAG_DNAT)
293 {
294 if (redir->src.any)
295 warn_section("redirect", redir, e, "must not have source '*' for DNAT target");
296 else if (!redir->_src)
297 warn_section("redirect", redir, e, "has no source specified");
298 else if (redir->helper.invert)
299 warn_section("redirect", redir, e, "must not use a negated helper match");
300 else
301 {
302 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
303 valid = true;
304
305 if (!check_local(e, redir, state) && !redir->dest.set &&
306 resolve_dest(e, redir, state))
307 {
308 warn_section("redirect", redir, e,
309 "does not specify a destination, assuming '%s'",
310 redir->dest.name);
311 }
312
313 if (redir->reflection && redir->_dest && redir->_src->masq)
314 {
315 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
316 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
317 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
318 }
319
320 if (redir->helper.ptr)
321 set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
322 }
323 }
324 else
325 {
326 if (redir->dest.any)
327 warn_section("redirect", redir, e,
328 "must not have destination '*' for SNAT target");
329 else if (!redir->_dest)
330 warn_section("redirect", redir, e, "has no destination specified");
331 else if (!redir->ip_dest.set)
332 warn_section("redirect", redir, e, "has no src_dip option specified");
333 else if (!list_empty(&redir->mac_src))
334 warn_section("redirect", redir, e, "must not use 'src_mac' option for SNAT target");
335 else if (redir->helper.set)
336 warn_section("redirect", redir, e, "must not use 'helper' option for SNAT target");
337 else
338 {
339 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
340 valid = true;
341 }
342 }
343
344 if (list_empty(&redir->proto))
345 {
346 warn_section("redirect", redir, e, "does not specify a protocol, assuming TCP+UDP");
347 fw3_parse_protocol(&redir->proto, "tcpudp", true);
348 }
349
350 if (!valid)
351 return false;
352
353 if (redir->target == FW3_FLAG_DNAT && !redir->port_redir.set)
354 redir->port_redir = redir->port_dest;
355
356 return true;
357 }
358
359 static struct fw3_redirect *
360 fw3_alloc_redirect(struct fw3_state *state)
361 {
362 struct fw3_redirect *redir;
363
364 redir = calloc(1, sizeof(*redir));
365 if (!redir)
366 return NULL;
367
368 INIT_LIST_HEAD(&redir->proto);
369 INIT_LIST_HEAD(&redir->mac_src);
370 INIT_LIST_HEAD(&redir->reflection_zones);
371
372 redir->enabled = true;
373 redir->reflection = true;
374
375 list_add_tail(&redir->list, &state->redirects);
376
377 return redir;
378 }
379
380 void
381 fw3_load_redirects(struct fw3_state *state, struct uci_package *p,
382 struct blob_attr *a)
383 {
384 struct uci_section *s;
385 struct uci_element *e;
386 struct fw3_redirect *redir;
387 struct blob_attr *entry;
388 unsigned rem;
389
390 INIT_LIST_HEAD(&state->redirects);
391
392 blob_for_each_attr(entry, a, rem)
393 {
394 const char *type;
395 const char *name = "ubus redirect";
396
397 if (!fw3_attr_parse_name_type(entry, &name, &type))
398 continue;
399
400 if (strcmp(type, "redirect"))
401 continue;
402
403 redir = fw3_alloc_redirect(state);
404 if (!redir)
405 continue;
406
407 if (!fw3_parse_blob_options(redir, fw3_redirect_opts, entry, name))
408 {
409 warn_section("redirect", redir, NULL, "skipped due to invalid options");
410 fw3_free_redirect(redir);
411 continue;
412 }
413
414 if (!check_redirect(state, redir, NULL)) {
415 fw3_free_redirect(redir);
416 continue;
417 }
418
419 select_helper(state, redir);
420 }
421
422 uci_foreach_element(&p->sections, e)
423 {
424 s = uci_to_section(e);
425
426 if (strcmp(s->type, "redirect"))
427 continue;
428
429 redir = fw3_alloc_redirect(state);
430 if (!redir)
431 continue;
432
433 if (!fw3_parse_options(redir, fw3_redirect_opts, s))
434 {
435 warn_elem(e, "skipped due to invalid options");
436 fw3_free_redirect(redir);
437 continue;
438 }
439
440 if (!check_redirect(state, redir, e)) {
441 fw3_free_redirect(redir);
442 continue;
443 }
444
445 select_helper(state, redir);
446 }
447 }
448
449 static void
450 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
451 {
452 if (redir->target == FW3_FLAG_DNAT)
453 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
454 else
455 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
456 }
457
458 static void
459 set_redirect(struct fw3_ipt_rule *r, struct fw3_port *port)
460 {
461 char buf[sizeof("65535-65535\0")];
462
463 fw3_ipt_rule_target(r, "REDIRECT");
464
465 if (port && port->set)
466 {
467 if (port->port_min == port->port_max)
468 sprintf(buf, "%u", port->port_min);
469 else
470 snprintf(buf, sizeof(buf), "%u-%u", port->port_min, port->port_max);
471
472 fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
473 }
474 }
475
476 static void
477 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
478 struct fw3_address *addr, struct fw3_port *port)
479 {
480 char buf[sizeof("255.255.255.255:65535-65535\0")];
481
482 buf[0] = '\0';
483
484 if (addr && addr->set)
485 {
486 inet_ntop(AF_INET, &addr->address.v4, buf, sizeof(buf));
487 }
488
489 if (port && port->set)
490 {
491 if (port->port_min == port->port_max)
492 sprintf(buf + strlen(buf), ":%u", port->port_min);
493 else
494 sprintf(buf + strlen(buf), ":%u-%u",
495 port->port_min, port->port_max);
496 }
497
498 if (target == FW3_FLAG_DNAT)
499 {
500 fw3_ipt_rule_target(r, "DNAT");
501 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
502 }
503 else
504 {
505 fw3_ipt_rule_target(r, "SNAT");
506 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
507 }
508 }
509
510 static void
511 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
512 {
513 if (redir->local)
514 set_redirect(r, &redir->port_redir);
515 else if (redir->target == FW3_FLAG_DNAT)
516 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
517 else
518 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
519 }
520
521 static void
522 set_comment(struct fw3_ipt_rule *r, const char *name, int num, const char *suffix)
523 {
524 if (name)
525 {
526 if (suffix)
527 fw3_ipt_rule_comment(r, "%s (%s)", name, suffix);
528 else
529 fw3_ipt_rule_comment(r, name);
530 }
531 else
532 {
533 if (suffix)
534 fw3_ipt_rule_comment(r, "@redirect[%u] (%s)", num, suffix);
535 else
536 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
537 }
538 }
539
540 static void
541 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
542 struct fw3_redirect *redir, int num,
543 struct fw3_protocol *proto, struct fw3_mac *mac)
544 {
545 struct fw3_ipt_rule *r;
546 struct fw3_address *src, *dst;
547 struct fw3_port *spt, *dpt;
548
549 switch (h->table)
550 {
551 case FW3_TABLE_NAT:
552 src = &redir->ip_src;
553 dst = &redir->ip_dest;
554 spt = &redir->port_src;
555 dpt = &redir->port_dest;
556
557 if (redir->target == FW3_FLAG_SNAT)
558 {
559 dst = &redir->ip_redir;
560 dpt = &redir->port_redir;
561 }
562
563 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
564 fw3_ipt_rule_sport_dport(r, spt, dpt);
565 fw3_ipt_rule_mac(r, mac);
566 fw3_ipt_rule_ipset(r, &redir->ipset);
567 fw3_ipt_rule_helper(r, &redir->helper);
568 fw3_ipt_rule_limit(r, &redir->limit);
569 fw3_ipt_rule_time(r, &redir->time);
570 fw3_ipt_rule_mark(r, &redir->mark);
571 set_target_nat(r, redir);
572 fw3_ipt_rule_extra(r, redir->extra);
573 set_comment(r, redir->name, num, NULL);
574 append_chain_nat(r, redir);
575 break;
576
577 case FW3_TABLE_RAW:
578 if (redir->target == FW3_FLAG_DNAT && redir->helper.ptr)
579 {
580 if (!fw3_cthelper_check_proto(redir->helper.ptr, proto))
581 {
582 info(" ! Skipping protocol %s since helper '%s' does not support it",
583 fw3_protoname(proto), redir->helper.ptr->name);
584 return;
585 }
586
587 if (!redir->helper.set)
588 info(" - Auto-selected conntrack helper '%s' based on proto/port",
589 redir->helper.ptr->name);
590
591 r = fw3_ipt_rule_create(h, proto, NULL, NULL, &redir->ip_src, &redir->ip_redir);
592 fw3_ipt_rule_sport_dport(r, &redir->port_src, &redir->port_redir);
593 fw3_ipt_rule_mac(r, mac);
594 fw3_ipt_rule_ipset(r, &redir->ipset);
595 fw3_ipt_rule_limit(r, &redir->limit);
596 fw3_ipt_rule_time(r, &redir->time);
597 fw3_ipt_rule_mark(r, &redir->mark);
598 fw3_ipt_rule_addarg(r, false, "-m", "conntrack");
599 fw3_ipt_rule_addarg(r, false, "--ctstate", "DNAT");
600 fw3_ipt_rule_target(r, "CT");
601 fw3_ipt_rule_addarg(r, false, "--helper", redir->helper.ptr->name);
602 set_comment(r, redir->name, num, "CT helper");
603 fw3_ipt_rule_append(r, "zone_%s_helper", redir->_src->name);
604 }
605 break;
606
607 default:
608 break;
609 }
610 }
611
612 static void
613 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
614 struct fw3_redirect *redir, int num,
615 struct fw3_protocol *proto, struct fw3_address *ra,
616 struct fw3_address *ia, struct fw3_address *ea, struct fw3_device *rz)
617 {
618 struct fw3_ipt_rule *r;
619
620 switch (h->table)
621 {
622 case FW3_TABLE_NAT:
623 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
624 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
625 fw3_ipt_rule_limit(r, &redir->limit);
626 fw3_ipt_rule_time(r, &redir->time);
627 set_comment(r, redir->name, num, "reflection");
628 set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
629 fw3_ipt_rule_replace(r, "zone_%s_prerouting", rz->name);
630
631 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
632 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
633 fw3_ipt_rule_limit(r, &redir->limit);
634 fw3_ipt_rule_time(r, &redir->time);
635 set_comment(r, redir->name, num, "reflection");
636 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
637 fw3_ipt_rule_replace(r, "zone_%s_postrouting", rz->name);
638 break;
639
640 default:
641 break;
642 }
643 }
644
645 static void
646 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
647 struct fw3_redirect *redir, int num)
648 {
649 struct list_head *ext_addrs, *int_addrs;
650 struct fw3_address *ext_addr, *int_addr, ref_addr;
651 struct fw3_protocol *proto;
652 struct fw3_mac *mac;
653 struct fw3_device *reflection_zone;
654 struct fw3_zone *zone;
655
656 if (redir->name)
657 info(" * Redirect '%s'", redir->name);
658 else
659 info(" * Redirect #%u", num);
660
661 if (!fw3_is_family(redir->_src, handle->family) ||
662 !fw3_is_family(redir->_dest, handle->family))
663 {
664 info(" ! Skipping due to different family of zone");
665 return;
666 }
667
668 if (!fw3_is_family(&redir->ip_src, handle->family) ||
669 !fw3_is_family(&redir->ip_dest, handle->family) ||
670 !fw3_is_family(&redir->ip_redir, handle->family))
671 {
672 if (!redir->ip_src.resolved ||
673 !redir->ip_dest.resolved ||
674 !redir->ip_redir.resolved)
675 info(" ! Skipping due to different family of ip address");
676
677 return;
678 }
679
680 if (redir->ipset.ptr)
681 {
682 if (!fw3_is_family(redir->ipset.ptr, handle->family))
683 {
684 info(" ! Skipping due to different family in ipset");
685 return;
686 }
687
688 if (!fw3_check_ipset(redir->ipset.ptr))
689 {
690 info(" ! Skipping due to missing ipset '%s'",
691 redir->ipset.ptr->external ?
692 redir->ipset.ptr->external : redir->ipset.ptr->name);
693 return;
694 }
695
696 set(redir->ipset.ptr->flags, handle->family, handle->family);
697 }
698
699 fw3_foreach(proto, &redir->proto)
700 fw3_foreach(mac, &redir->mac_src)
701 print_redirect(handle, state, redir, num, proto, mac);
702
703 /* reflection rules */
704 if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
705 return;
706
707 if (!redir->_dest || !redir->_src->masq)
708 return;
709
710 ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
711
712 if (!ext_addrs)
713 goto out;
714
715 list_for_each_entry(ext_addr, ext_addrs, list)
716 {
717 if (!fw3_is_family(ext_addr, handle->family))
718 continue;
719
720 for (reflection_zone = list_empty(&redir->reflection_zones)
721 ? &redir->dest
722 : list_first_entry(&redir->reflection_zones, struct fw3_device, list);
723 list_empty(&redir->reflection_zones)
724 ? (reflection_zone == &redir->dest)
725 : (&reflection_zone->list != &redir->reflection_zones);
726 reflection_zone = list_empty(&redir->reflection_zones)
727 ? NULL
728 : list_entry(reflection_zone->list.next, struct fw3_device, list))
729 {
730 zone = fw3_lookup_zone(state, reflection_zone->name);
731
732 if (!zone)
733 continue;
734
735 int_addrs = fw3_resolve_zone_addresses(zone, NULL);
736 list_for_each_entry(int_addr, int_addrs, list)
737 {
738 if (!fw3_is_family(int_addr, handle->family))
739 continue;
740
741 fw3_foreach(proto, &redir->proto)
742 {
743 if (!proto)
744 continue;
745
746 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
747 ref_addr = *int_addr;
748 else
749 ref_addr = *ext_addr;
750
751 ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
752 ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
753
754 print_reflection(handle, state, redir, num, proto,
755 &ref_addr, int_addr, ext_addr, reflection_zone);
756 }
757 }
758 }
759 }
760
761 out:
762 fw3_free_list(ext_addrs);
763 fw3_free_list(int_addrs);
764 }
765
766 void
767 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
768 {
769 int num = 0;
770 struct fw3_redirect *redir;
771
772 if (handle->family == FW3_FAMILY_V6)
773 return;
774
775 if (handle->table != FW3_TABLE_FILTER &&
776 handle->table != FW3_TABLE_NAT &&
777 handle->table != FW3_TABLE_RAW)
778 return;
779
780 list_for_each_entry(redir, &state->redirects, list)
781 {
782 if (handle->table == FW3_TABLE_RAW && !redir->helper.ptr)
783 continue;
784
785 expand_redirect(handle, state, redir, num++);
786 }
787 }