2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013-2018 Jo-Philipp Wich <jo@mein.io>
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.
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.
19 #include "redirects.h"
22 const struct fw3_option fw3_redirect_opts[] = {
23 FW3_OPT("enabled", bool, redirect, enabled),
25 FW3_OPT("name", string, redirect, name),
26 FW3_OPT("family", family, redirect, family),
28 FW3_OPT("src", device, redirect, src),
29 FW3_OPT("dest", device, redirect, dest),
31 FW3_OPT("ipset", setmatch, redirect, ipset),
32 FW3_OPT("helper", cthelper, redirect, helper),
34 FW3_LIST("proto", protocol, redirect, proto),
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),
40 FW3_OPT("src_dip", network, redirect, ip_dest),
41 FW3_OPT("src_dport", port, redirect, port_dest),
43 FW3_OPT("dest_ip", network, redirect, ip_redir),
44 FW3_OPT("dest_port", port, redirect, port_redir),
46 FW3_OPT("extra", string, redirect, extra),
48 FW3_OPT("limit", limit, redirect, limit),
49 FW3_OPT("limit_burst", int, redirect, limit.burst),
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),
59 FW3_OPT("mark", mark, redirect, mark),
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),
66 FW3_OPT("target", target, redirect, target),
73 check_families(struct uci_element *e, struct fw3_redirect *r)
75 if (r->family == FW3_FAMILY_ANY)
78 if (r->_src && r->_src->family && r->_src->family != r->family)
80 warn_elem(e, "refers to source zone with different family");
84 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
86 warn_elem(e, "refers to destination zone with different family");
90 if (r->ipset.ptr && r->ipset.ptr->family &&
91 r->ipset.ptr->family != r->family)
93 warn_elem(e, "refers to ipset with different family");
97 if (r->helper.ptr && r->helper.ptr->family &&
98 r->helper.ptr->family != r->family)
100 warn_elem(e, "refers to CT helper not supporting family");
104 if (r->ip_src.family && r->ip_src.family != r->family)
106 warn_elem(e, "uses source ip with different family");
110 if (r->ip_dest.family && r->ip_dest.family != r->family)
112 warn_elem(e, "uses destination ip with different family");
116 if (r->ip_redir.family && r->ip_redir.family != r->family)
118 warn_elem(e, "uses redirect ip with different family");
126 compare_addr(struct fw3_address *a, struct fw3_address *b)
128 if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
131 return ((a->address.v4.s_addr & a->mask.v4.s_addr) ==
132 (b->address.v4.s_addr & a->mask.v4.s_addr));
136 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
137 struct fw3_state *state)
139 struct fw3_zone *zone;
140 struct fw3_address *addr;
141 struct list_head *addrs;
143 if (!redir->ip_redir.set)
146 list_for_each_entry(zone, &state->zones, list)
148 addrs = fw3_resolve_zone_addresses(zone, NULL);
153 list_for_each_entry(addr, addrs, list)
155 if (!compare_addr(addr, &redir->ip_redir))
158 snprintf(redir->dest.name, sizeof(redir->dest.name), "%s", zone->name);
159 redir->dest.set = true;
165 fw3_free_list(addrs);
175 check_local(struct uci_element *e, struct fw3_redirect *redir,
176 struct fw3_state *state)
178 if (redir->target != FW3_FLAG_DNAT)
181 if (!redir->ip_redir.set)
188 select_helper(struct fw3_state *state, struct fw3_redirect *redir)
190 struct fw3_protocol *proto;
191 struct fw3_cthelper *helper;
194 if (!state->defaults.auto_helper)
197 if (!redir->_src || redir->target != FW3_FLAG_DNAT)
200 if (!redir->port_redir.set || redir->port_redir.invert)
203 if (redir->helper.set || redir->helper.ptr)
206 if (list_empty(&redir->proto))
209 list_for_each_entry(proto, &redir->proto, list)
211 helper = fw3_lookup_cthelper_by_proto_port(state, proto, &redir->port_redir);
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
223 redir->helper.set = false;
224 redir->helper.ptr = helper;
226 set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
230 check_redirect(struct fw3_state *state, struct fw3_redirect *redir, struct uci_element *e)
237 if (redir->src.invert)
239 warn_section("redirect", redir, e, "must not have an inverted source");
242 else if (redir->src.set && !redir->src.any &&
243 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
245 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
249 else if (redir->dest.set && !redir->dest.any &&
250 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
252 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
256 else if (redir->ipset.set && state->disable_ipsets)
258 warn_section("redirect", redir, e, "skipped due to disabled ipset support");
261 else if (redir->ipset.set &&
262 !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
264 warn_section("redirect", redir, e, "refers to unknown ipset '%s'",
268 else if (redir->helper.set &&
269 !(redir->helper.ptr = fw3_lookup_cthelper(state, redir->helper.name)))
271 warn_section("redirect", redir, e, "refers to unknown CT helper '%s'",
276 if (!check_families(e, redir))
279 if (redir->target == FW3_FLAG_UNSPEC)
281 warn_section("redirect", redir, e, "has no target specified, defaulting to DNAT");
282 redir->target = FW3_FLAG_DNAT;
284 else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
286 warn_section("redirect", redir, e, "has invalid target specified, defaulting to DNAT");
287 redir->target = FW3_FLAG_DNAT;
292 if (redir->target == FW3_FLAG_DNAT)
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");
302 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
305 if (!check_local(e, redir, state) && !redir->dest.set &&
306 resolve_dest(e, redir, state))
308 warn_section("redirect", redir, e,
309 "does not specify a destination, assuming '%s'",
313 if (redir->reflection && redir->_dest && redir->_src->masq)
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);
320 if (redir->helper.ptr)
321 set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
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");
339 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
344 if (list_empty(&redir->proto))
346 warn_section("redirect", redir, e, "does not specify a protocol, assuming TCP+UDP");
347 fw3_parse_protocol(&redir->proto, "tcpudp", true);
353 if (redir->target == FW3_FLAG_DNAT && !redir->port_redir.set)
354 redir->port_redir = redir->port_dest;
359 static struct fw3_redirect *
360 fw3_alloc_redirect(struct fw3_state *state)
362 struct fw3_redirect *redir;
364 redir = calloc(1, sizeof(*redir));
368 INIT_LIST_HEAD(&redir->proto);
369 INIT_LIST_HEAD(&redir->mac_src);
370 INIT_LIST_HEAD(&redir->reflection_zones);
372 redir->enabled = true;
373 redir->reflection = true;
375 list_add_tail(&redir->list, &state->redirects);
381 fw3_load_redirects(struct fw3_state *state, struct uci_package *p,
384 struct uci_section *s;
385 struct uci_element *e;
386 struct fw3_redirect *redir;
387 struct blob_attr *entry;
390 INIT_LIST_HEAD(&state->redirects);
392 blob_for_each_attr(entry, a, rem)
395 const char *name = "ubus redirect";
397 if (!fw3_attr_parse_name_type(entry, &name, &type))
400 if (strcmp(type, "redirect"))
403 redir = fw3_alloc_redirect(state);
407 if (!fw3_parse_blob_options(redir, fw3_redirect_opts, entry, name))
409 warn_section("redirect", redir, NULL, "skipped due to invalid options");
410 fw3_free_redirect(redir);
414 if (!check_redirect(state, redir, NULL)) {
415 fw3_free_redirect(redir);
419 select_helper(state, redir);
422 uci_foreach_element(&p->sections, e)
424 s = uci_to_section(e);
426 if (strcmp(s->type, "redirect"))
429 redir = fw3_alloc_redirect(state);
433 if (!fw3_parse_options(redir, fw3_redirect_opts, s))
435 warn_elem(e, "skipped due to invalid options");
436 fw3_free_redirect(redir);
440 if (!check_redirect(state, redir, e)) {
441 fw3_free_redirect(redir);
445 select_helper(state, redir);
450 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
452 if (redir->target == FW3_FLAG_DNAT)
453 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
455 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
459 set_redirect(struct fw3_ipt_rule *r, struct fw3_port *port)
461 char buf[sizeof("65535-65535")];
463 fw3_ipt_rule_target(r, "REDIRECT");
465 if (port && port->set)
467 if (port->port_min == port->port_max)
468 snprintf(buf, sizeof(buf), "%u", port->port_min);
470 snprintf(buf, sizeof(buf), "%u-%u", port->port_min, port->port_max);
472 fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
477 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
478 struct fw3_address *addr, struct fw3_port *port)
480 char buf[sizeof("255.255.255.255:65535-65535")] = {};
481 char ip[INET_ADDRSTRLEN], *p = buf;
482 size_t rem = sizeof(buf);
485 if (addr && addr->set)
487 inet_ntop(AF_INET, &addr->address.v4, ip, sizeof(ip));
489 len = snprintf(p, rem, "%s", ip);
491 if (len < 0 || len >= rem)
498 if (port && port->set)
500 if (port->port_min == port->port_max)
501 snprintf(p, rem, ":%u", port->port_min);
503 snprintf(p, rem, ":%u-%u", port->port_min, port->port_max);
506 if (target == FW3_FLAG_DNAT)
508 fw3_ipt_rule_target(r, "DNAT");
509 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
513 fw3_ipt_rule_target(r, "SNAT");
514 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
519 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
522 set_redirect(r, &redir->port_redir);
523 else if (redir->target == FW3_FLAG_DNAT)
524 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
526 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
530 set_comment(struct fw3_ipt_rule *r, const char *name, int num, const char *suffix)
535 fw3_ipt_rule_comment(r, "%s (%s)", name, suffix);
537 fw3_ipt_rule_comment(r, name);
542 fw3_ipt_rule_comment(r, "@redirect[%u] (%s)", num, suffix);
544 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
549 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
550 struct fw3_redirect *redir, int num,
551 struct fw3_protocol *proto, struct fw3_mac *mac)
553 struct fw3_ipt_rule *r;
554 struct fw3_address *src, *dst;
555 struct fw3_port *spt, *dpt;
560 src = &redir->ip_src;
561 dst = &redir->ip_dest;
562 spt = &redir->port_src;
563 dpt = &redir->port_dest;
565 if (redir->target == FW3_FLAG_SNAT)
567 dst = &redir->ip_redir;
568 dpt = &redir->port_redir;
571 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
572 fw3_ipt_rule_sport_dport(r, spt, dpt);
573 fw3_ipt_rule_mac(r, mac);
574 fw3_ipt_rule_ipset(r, &redir->ipset);
575 fw3_ipt_rule_helper(r, &redir->helper);
576 fw3_ipt_rule_limit(r, &redir->limit);
577 fw3_ipt_rule_time(r, &redir->time);
578 fw3_ipt_rule_mark(r, &redir->mark);
579 set_target_nat(r, redir);
580 fw3_ipt_rule_extra(r, redir->extra);
581 set_comment(r, redir->name, num, NULL);
582 append_chain_nat(r, redir);
586 if (redir->target == FW3_FLAG_DNAT && redir->helper.ptr)
588 if (!fw3_cthelper_check_proto(redir->helper.ptr, proto))
590 info(" ! Skipping protocol %s since helper '%s' does not support it",
591 fw3_protoname(proto), redir->helper.ptr->name);
595 if (!redir->helper.set)
596 info(" - Auto-selected conntrack helper '%s' based on proto/port",
597 redir->helper.ptr->name);
599 r = fw3_ipt_rule_create(h, proto, NULL, NULL, &redir->ip_src, &redir->ip_redir);
600 fw3_ipt_rule_sport_dport(r, &redir->port_src, &redir->port_redir);
601 fw3_ipt_rule_mac(r, mac);
602 fw3_ipt_rule_ipset(r, &redir->ipset);
603 fw3_ipt_rule_limit(r, &redir->limit);
604 fw3_ipt_rule_time(r, &redir->time);
605 fw3_ipt_rule_mark(r, &redir->mark);
606 fw3_ipt_rule_addarg(r, false, "-m", "conntrack");
607 fw3_ipt_rule_addarg(r, false, "--ctstate", "DNAT");
608 fw3_ipt_rule_target(r, "CT");
609 fw3_ipt_rule_addarg(r, false, "--helper", redir->helper.ptr->name);
610 set_comment(r, redir->name, num, "CT helper");
611 fw3_ipt_rule_append(r, "zone_%s_helper", redir->_src->name);
621 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
622 struct fw3_redirect *redir, int num,
623 struct fw3_protocol *proto, struct fw3_address *ra,
624 struct fw3_address *ia, struct fw3_address *ea, struct fw3_device *rz)
626 struct fw3_ipt_rule *r;
631 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
632 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
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_DNAT, &redir->ip_redir, &redir->port_redir);
637 fw3_ipt_rule_replace(r, "zone_%s_prerouting", rz->name);
639 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
640 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
641 fw3_ipt_rule_limit(r, &redir->limit);
642 fw3_ipt_rule_time(r, &redir->time);
643 set_comment(r, redir->name, num, "reflection");
644 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
645 fw3_ipt_rule_replace(r, "zone_%s_postrouting", rz->name);
654 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
655 struct fw3_redirect *redir, int num)
657 struct list_head *ext_addrs, *int_addrs;
658 struct fw3_address *ext_addr, *int_addr, ref_addr;
659 struct fw3_protocol *proto;
661 struct fw3_device *reflection_zone;
662 struct fw3_zone *zone;
665 info(" * Redirect '%s'", redir->name);
667 info(" * Redirect #%u", num);
669 if (!fw3_is_family(redir->_src, handle->family) ||
670 !fw3_is_family(redir->_dest, handle->family))
672 info(" ! Skipping due to different family of zone");
676 if (!fw3_is_family(&redir->ip_src, handle->family) ||
677 !fw3_is_family(&redir->ip_dest, handle->family) ||
678 !fw3_is_family(&redir->ip_redir, handle->family))
680 if (!redir->ip_src.resolved ||
681 !redir->ip_dest.resolved ||
682 !redir->ip_redir.resolved)
683 info(" ! Skipping due to different family of ip address");
688 if (redir->ipset.ptr)
690 if (!fw3_is_family(redir->ipset.ptr, handle->family))
692 info(" ! Skipping due to different family in ipset");
696 if (!fw3_check_ipset(redir->ipset.ptr))
698 info(" ! Skipping due to missing ipset '%s'",
699 redir->ipset.ptr->external ?
700 redir->ipset.ptr->external : redir->ipset.ptr->name);
704 set(redir->ipset.ptr->flags, handle->family, handle->family);
707 fw3_foreach(proto, &redir->proto)
708 fw3_foreach(mac, &redir->mac_src)
709 print_redirect(handle, state, redir, num, proto, mac);
711 /* reflection rules */
712 if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
715 if (!redir->_dest || !redir->_src->masq)
718 ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
723 list_for_each_entry(ext_addr, ext_addrs, list)
725 if (!fw3_is_family(ext_addr, handle->family))
728 for (reflection_zone = list_empty(&redir->reflection_zones)
730 : list_first_entry(&redir->reflection_zones, struct fw3_device, list);
731 list_empty(&redir->reflection_zones)
732 ? (reflection_zone == &redir->dest)
733 : (&reflection_zone->list != &redir->reflection_zones);
734 reflection_zone = list_empty(&redir->reflection_zones)
736 : list_entry(reflection_zone->list.next, struct fw3_device, list))
738 zone = fw3_lookup_zone(state, reflection_zone->name);
743 int_addrs = fw3_resolve_zone_addresses(zone, NULL);
744 list_for_each_entry(int_addr, int_addrs, list)
746 if (!fw3_is_family(int_addr, handle->family))
749 fw3_foreach(proto, &redir->proto)
754 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
755 ref_addr = *int_addr;
757 ref_addr = *ext_addr;
759 ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
760 ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
762 print_reflection(handle, state, redir, num, proto,
763 &ref_addr, int_addr, ext_addr, reflection_zone);
770 fw3_free_list(ext_addrs);
771 fw3_free_list(int_addrs);
775 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
778 struct fw3_redirect *redir;
780 if (handle->family == FW3_FAMILY_V6)
783 if (handle->table != FW3_TABLE_FILTER &&
784 handle->table != FW3_TABLE_NAT &&
785 handle->table != FW3_TABLE_RAW)
788 list_for_each_entry(redir, &state->redirects, list)
790 if (handle->table == FW3_TABLE_RAW && !redir->helper.ptr)
793 expand_redirect(handle, state, redir, num++);