helpers: implement explicit CT helper assignment support
[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
65 FW3_OPT("target", target, redirect, target),
66
67 { }
68 };
69
70
71 static bool
72 check_families(struct uci_element *e, struct fw3_redirect *r)
73 {
74 if (r->family == FW3_FAMILY_ANY)
75 return true;
76
77 if (r->_src && r->_src->family && r->_src->family != r->family)
78 {
79 warn_elem(e, "refers to source zone with different family");
80 return false;
81 }
82
83 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
84 {
85 warn_elem(e, "refers to destination zone with different family");
86 return false;
87 }
88
89 if (r->ipset.ptr && r->ipset.ptr->family &&
90 r->ipset.ptr->family != r->family)
91 {
92 warn_elem(e, "refers to ipset with different family");
93 return false;
94 }
95
96 if (r->helper.ptr && r->helper.ptr->family &&
97 r->helper.ptr->family != r->family)
98 {
99 warn_elem(e, "refers to CT helper not supporting family");
100 return false;
101 }
102
103 if (r->ip_src.family && r->ip_src.family != r->family)
104 {
105 warn_elem(e, "uses source ip with different family");
106 return false;
107 }
108
109 if (r->ip_dest.family && r->ip_dest.family != r->family)
110 {
111 warn_elem(e, "uses destination ip with different family");
112 return false;
113 }
114
115 if (r->ip_redir.family && r->ip_redir.family != r->family)
116 {
117 warn_elem(e, "uses redirect ip with different family");
118 return false;
119 }
120
121 return true;
122 }
123
124 static bool
125 compare_addr(struct fw3_address *a, struct fw3_address *b)
126 {
127 if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
128 return false;
129
130 return ((a->address.v4.s_addr & a->mask.v4.s_addr) ==
131 (b->address.v4.s_addr & a->mask.v4.s_addr));
132 }
133
134 static bool
135 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
136 struct fw3_state *state)
137 {
138 struct fw3_zone *zone;
139 struct fw3_address *addr;
140 struct list_head *addrs;
141
142 if (!redir->ip_redir.set)
143 return false;
144
145 list_for_each_entry(zone, &state->zones, list)
146 {
147 addrs = fw3_resolve_zone_addresses(zone, NULL);
148
149 if (!addrs)
150 continue;
151
152 list_for_each_entry(addr, addrs, list)
153 {
154 if (!compare_addr(addr, &redir->ip_redir))
155 continue;
156
157 strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name));
158 redir->dest.set = true;
159 redir->_dest = zone;
160
161 break;
162 }
163
164 fw3_free_list(addrs);
165
166 if (redir->_dest)
167 return true;
168 }
169
170 return false;
171 }
172
173 static bool
174 check_local(struct uci_element *e, struct fw3_redirect *redir,
175 struct fw3_state *state)
176 {
177 if (redir->target != FW3_FLAG_DNAT)
178 return false;
179
180 if (!redir->ip_redir.set)
181 redir->local = true;
182
183 return redir->local;
184 }
185
186 static void
187 select_helper(struct fw3_state *state, struct fw3_redirect *redir)
188 {
189 struct fw3_protocol *proto;
190 struct fw3_cthelper *helper;
191 int n_matches = 0;
192
193 if (!state->defaults.auto_helper)
194 return;
195
196 if (!redir->_src || redir->target != FW3_FLAG_DNAT)
197 return;
198
199 if (!redir->port_redir.set || redir->port_redir.invert)
200 return;
201
202 if (redir->helper.set || redir->helper.ptr)
203 return;
204
205 if (list_empty(&redir->proto))
206 return;
207
208 list_for_each_entry(proto, &redir->proto, list)
209 {
210 helper = fw3_lookup_cthelper_by_proto_port(state, proto, &redir->port_redir);
211
212 if (helper)
213 n_matches++;
214 }
215
216 if (n_matches != 1)
217 return;
218
219 /* store pointer to auto-selected helper but set ".set" flag to false,
220 * to allow later code to decide between configured or auto-selected
221 * helpers */
222 redir->helper.set = false;
223 redir->helper.ptr = helper;
224
225 set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
226 }
227
228 static bool
229 check_redirect(struct fw3_state *state, struct fw3_redirect *redir, struct uci_element *e)
230 {
231 bool valid;
232
233 if (!redir->enabled)
234 return false;
235
236 if (redir->src.invert)
237 {
238 warn_section("redirect", redir, e, "must not have an inverted source");
239 return false;
240 }
241 else if (redir->src.set && !redir->src.any &&
242 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
243 {
244 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
245 redir->src.name);
246 return false;
247 }
248 else if (redir->dest.set && !redir->dest.any &&
249 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
250 {
251 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
252 redir->dest.name);
253 return false;
254 }
255 else if (redir->ipset.set && state->disable_ipsets)
256 {
257 warn_section("redirect", redir, e, "skipped due to disabled ipset support",
258 redir->name);
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'", redir->name,
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->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
371 redir->enabled = true;
372 redir->reflection = true;
373
374 list_add_tail(&redir->list, &state->redirects);
375
376 return redir;
377 }
378
379 void
380 fw3_load_redirects(struct fw3_state *state, struct uci_package *p,
381 struct blob_attr *a)
382 {
383 struct uci_section *s;
384 struct uci_element *e;
385 struct fw3_redirect *redir;
386 struct blob_attr *entry;
387 unsigned rem;
388
389 INIT_LIST_HEAD(&state->redirects);
390
391 blob_for_each_attr(entry, a, rem)
392 {
393 const char *type;
394 const char *name = "ubus redirect";
395
396 if (!fw3_attr_parse_name_type(entry, &name, &type))
397 continue;
398
399 if (strcmp(type, "redirect"))
400 continue;
401
402 redir = fw3_alloc_redirect(state);
403 if (!redir)
404 continue;
405
406 if (!fw3_parse_blob_options(redir, fw3_redirect_opts, entry, name))
407 {
408 warn_section("redirect", redir, NULL, "skipped due to invalid options");
409 fw3_free_redirect(redir);
410 continue;
411 }
412
413 if (!check_redirect(state, redir, NULL)) {
414 fw3_free_redirect(redir);
415 continue;
416 }
417
418 select_helper(state, redir);
419 }
420
421 uci_foreach_element(&p->sections, e)
422 {
423 s = uci_to_section(e);
424
425 if (strcmp(s->type, "redirect"))
426 continue;
427
428 redir = fw3_alloc_redirect(state);
429 if (!redir)
430 continue;
431
432 if (!fw3_parse_options(redir, fw3_redirect_opts, s))
433 {
434 warn_elem(e, "skipped due to invalid options");
435 fw3_free_redirect(redir);
436 continue;
437 }
438
439 if (!check_redirect(state, redir, e)) {
440 fw3_free_redirect(redir);
441 continue;
442 }
443
444 select_helper(state, redir);
445 }
446 }
447
448 static void
449 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
450 {
451 if (redir->target == FW3_FLAG_DNAT)
452 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
453 else
454 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
455 }
456
457 static void
458 set_redirect(struct fw3_ipt_rule *r, struct fw3_port *port)
459 {
460 char buf[sizeof("65535-65535\0")];
461
462 fw3_ipt_rule_target(r, "REDIRECT");
463
464 if (port && port->set)
465 {
466 if (port->port_min == port->port_max)
467 sprintf(buf, "%u", port->port_min);
468 else
469 sprintf(buf, "%u-%u", port->port_min, port->port_max);
470
471 fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
472 }
473 }
474
475 static void
476 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
477 struct fw3_address *addr, struct fw3_port *port)
478 {
479 char buf[sizeof("255.255.255.255:65535-65535\0")];
480
481 buf[0] = '\0';
482
483 if (addr && addr->set)
484 {
485 inet_ntop(AF_INET, &addr->address.v4, buf, sizeof(buf));
486 }
487
488 if (port && port->set)
489 {
490 if (port->port_min == port->port_max)
491 sprintf(buf + strlen(buf), ":%u", port->port_min);
492 else
493 sprintf(buf + strlen(buf), ":%u-%u",
494 port->port_min, port->port_max);
495 }
496
497 if (target == FW3_FLAG_DNAT)
498 {
499 fw3_ipt_rule_target(r, "DNAT");
500 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
501 }
502 else
503 {
504 fw3_ipt_rule_target(r, "SNAT");
505 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
506 }
507 }
508
509 static void
510 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
511 {
512 if (redir->local)
513 set_redirect(r, &redir->port_redir);
514 else if (redir->target == FW3_FLAG_DNAT)
515 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
516 else
517 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
518 }
519
520 static void
521 set_comment(struct fw3_ipt_rule *r, const char *name, int num, const char *suffix)
522 {
523 if (name)
524 {
525 if (suffix)
526 fw3_ipt_rule_comment(r, "%s (%s)", name, suffix);
527 else
528 fw3_ipt_rule_comment(r, name);
529 }
530 else
531 {
532 if (suffix)
533 fw3_ipt_rule_comment(r, "@redirect[%u] (%s)", num, suffix);
534 else
535 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
536 }
537 }
538
539 static void
540 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
541 struct fw3_redirect *redir, int num,
542 struct fw3_protocol *proto, struct fw3_mac *mac)
543 {
544 struct fw3_ipt_rule *r;
545 struct fw3_address *src, *dst;
546 struct fw3_port *spt, *dpt;
547
548 switch (h->table)
549 {
550 case FW3_TABLE_NAT:
551 src = &redir->ip_src;
552 dst = &redir->ip_dest;
553 spt = &redir->port_src;
554 dpt = &redir->port_dest;
555
556 if (redir->target == FW3_FLAG_SNAT)
557 {
558 dst = &redir->ip_redir;
559 dpt = &redir->port_redir;
560 }
561
562 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
563 fw3_ipt_rule_sport_dport(r, spt, dpt);
564 fw3_ipt_rule_mac(r, mac);
565 fw3_ipt_rule_ipset(r, &redir->ipset);
566 fw3_ipt_rule_helper(r, &redir->helper);
567 fw3_ipt_rule_limit(r, &redir->limit);
568 fw3_ipt_rule_time(r, &redir->time);
569 fw3_ipt_rule_mark(r, &redir->mark);
570 set_target_nat(r, redir);
571 fw3_ipt_rule_extra(r, redir->extra);
572 set_comment(r, redir->name, num, NULL);
573 append_chain_nat(r, redir);
574 break;
575
576 case FW3_TABLE_RAW:
577 if (redir->target == FW3_FLAG_DNAT && redir->helper.ptr)
578 {
579 if (redir->helper.ptr->proto.protocol != proto->protocol)
580 {
581 info(" ! Skipping protocol %s since helper '%s' does not support it",
582 fw3_protoname(proto), redir->helper.ptr->name);
583 return;
584 }
585
586 if (!redir->helper.set)
587 info(" - Auto-selected conntrack helper '%s' based on proto/port",
588 redir->helper.ptr->name);
589
590 r = fw3_ipt_rule_create(h, proto, NULL, NULL, &redir->ip_src, &redir->ip_redir);
591 fw3_ipt_rule_sport_dport(r, &redir->port_src, &redir->port_redir);
592 fw3_ipt_rule_mac(r, mac);
593 fw3_ipt_rule_ipset(r, &redir->ipset);
594 fw3_ipt_rule_limit(r, &redir->limit);
595 fw3_ipt_rule_time(r, &redir->time);
596 fw3_ipt_rule_mark(r, &redir->mark);
597 fw3_ipt_rule_addarg(r, false, "-m", "conntrack");
598 fw3_ipt_rule_addarg(r, false, "--ctstate", "DNAT");
599 fw3_ipt_rule_target(r, "CT");
600 fw3_ipt_rule_addarg(r, false, "--helper", redir->helper.ptr->name);
601 set_comment(r, redir->name, num, "CT helper");
602 fw3_ipt_rule_append(r, "zone_%s_helper", redir->_src->name);
603 }
604 break;
605
606 default:
607 break;
608 }
609 }
610
611 static void
612 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
613 struct fw3_redirect *redir, int num,
614 struct fw3_protocol *proto, struct fw3_address *ra,
615 struct fw3_address *ia, struct fw3_address *ea)
616 {
617 struct fw3_ipt_rule *r;
618
619 switch (h->table)
620 {
621 case FW3_TABLE_NAT:
622 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
623 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
624 fw3_ipt_rule_limit(r, &redir->limit);
625 fw3_ipt_rule_time(r, &redir->time);
626 set_comment(r, redir->name, num, "reflection");
627 set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
628 fw3_ipt_rule_replace(r, "zone_%s_prerouting", redir->dest.name);
629
630 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
631 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
632 fw3_ipt_rule_limit(r, &redir->limit);
633 fw3_ipt_rule_time(r, &redir->time);
634 set_comment(r, redir->name, num, "reflection");
635 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
636 fw3_ipt_rule_replace(r, "zone_%s_postrouting", redir->dest.name);
637 break;
638
639 default:
640 break;
641 }
642 }
643
644 static void
645 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
646 struct fw3_redirect *redir, int num)
647 {
648 struct list_head *ext_addrs, *int_addrs;
649 struct fw3_address *ext_addr, *int_addr, ref_addr;
650 struct fw3_protocol *proto;
651 struct fw3_mac *mac;
652
653 if (redir->name)
654 info(" * Redirect '%s'", redir->name);
655 else
656 info(" * Redirect #%u", num);
657
658 if (!fw3_is_family(redir->_src, handle->family) ||
659 !fw3_is_family(redir->_dest, handle->family))
660 {
661 info(" ! Skipping due to different family of zone");
662 return;
663 }
664
665 if (!fw3_is_family(&redir->ip_src, handle->family) ||
666 !fw3_is_family(&redir->ip_dest, handle->family) ||
667 !fw3_is_family(&redir->ip_redir, handle->family))
668 {
669 if (!redir->ip_src.resolved ||
670 !redir->ip_dest.resolved ||
671 !redir->ip_redir.resolved)
672 info(" ! Skipping due to different family of ip address");
673
674 return;
675 }
676
677 if (redir->ipset.ptr)
678 {
679 if (!fw3_is_family(redir->ipset.ptr, handle->family))
680 {
681 info(" ! Skipping due to different family in ipset");
682 return;
683 }
684
685 if (!fw3_check_ipset(redir->ipset.ptr))
686 {
687 info(" ! Skipping due to missing ipset '%s'",
688 redir->ipset.ptr->external ?
689 redir->ipset.ptr->external : redir->ipset.ptr->name);
690 return;
691 }
692
693 set(redir->ipset.ptr->flags, handle->family, handle->family);
694 }
695
696 fw3_foreach(proto, &redir->proto)
697 fw3_foreach(mac, &redir->mac_src)
698 print_redirect(handle, state, redir, num, proto, mac);
699
700 /* reflection rules */
701 if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
702 return;
703
704 if (!redir->_dest || !redir->_src->masq)
705 return;
706
707 ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
708 int_addrs = fw3_resolve_zone_addresses(redir->_dest, NULL);
709
710 if (!ext_addrs || !int_addrs)
711 goto out;
712
713 list_for_each_entry(ext_addr, ext_addrs, list)
714 {
715 if (!fw3_is_family(ext_addr, handle->family))
716 continue;
717
718 list_for_each_entry(int_addr, int_addrs, list)
719 {
720 if (!fw3_is_family(int_addr, handle->family))
721 continue;
722
723 fw3_foreach(proto, &redir->proto)
724 {
725 if (!proto)
726 continue;
727
728 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
729 ref_addr = *int_addr;
730 else
731 ref_addr = *ext_addr;
732
733 ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
734 ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
735
736 print_reflection(handle, state, redir, num, proto,
737 &ref_addr, int_addr, ext_addr);
738 }
739 }
740 }
741
742 out:
743 fw3_free_list(ext_addrs);
744 fw3_free_list(int_addrs);
745 }
746
747 void
748 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
749 {
750 int num = 0;
751 struct fw3_redirect *redir;
752
753 if (handle->family == FW3_FAMILY_V6)
754 return;
755
756 if (handle->table != FW3_TABLE_FILTER &&
757 handle->table != FW3_TABLE_NAT &&
758 handle->table != FW3_TABLE_RAW)
759 return;
760
761 list_for_each_entry(redir, &state->redirects, list)
762 {
763 if (handle->table == FW3_TABLE_RAW && !redir->helper.ptr)
764 continue;
765
766 expand_redirect(handle, state, redir, num++);
767 }
768 }