2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013-2014 Jo-Philipp Wich <jow@openwrt.org>
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),
33 FW3_LIST("proto", protocol, redirect, proto),
35 FW3_OPT("src_ip", network, redirect, ip_src),
36 FW3_LIST("src_mac", mac, redirect, mac_src),
37 FW3_OPT("src_port", port, redirect, port_src),
39 FW3_OPT("src_dip", network, redirect, ip_dest),
40 FW3_OPT("src_dport", port, redirect, port_dest),
42 FW3_OPT("dest_ip", network, redirect, ip_redir),
43 FW3_OPT("dest_port", port, redirect, port_redir),
45 FW3_OPT("extra", string, redirect, extra),
47 FW3_OPT("limit", limit, redirect, limit),
48 FW3_OPT("limit_burst", int, redirect, limit.burst),
50 FW3_OPT("utc_time", bool, redirect, time.utc),
51 FW3_OPT("start_date", date, redirect, time.datestart),
52 FW3_OPT("stop_date", date, redirect, time.datestop),
53 FW3_OPT("start_time", time, redirect, time.timestart),
54 FW3_OPT("stop_time", time, redirect, time.timestop),
55 FW3_OPT("weekdays", weekdays, redirect, time.weekdays),
56 FW3_OPT("monthdays", monthdays, redirect, time.monthdays),
58 FW3_OPT("mark", mark, redirect, mark),
60 FW3_OPT("reflection", bool, redirect, reflection),
61 FW3_OPT("reflection_src", reflection_source,
62 redirect, reflection_src),
64 FW3_OPT("target", target, redirect, target),
71 check_families(struct uci_element *e, struct fw3_redirect *r)
73 if (r->family == FW3_FAMILY_ANY)
76 if (r->_src && r->_src->family && r->_src->family != r->family)
78 warn_elem(e, "refers to source zone with different family");
82 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
84 warn_elem(e, "refers to destination zone with different family");
88 if (r->ipset.ptr && r->ipset.ptr->family &&
89 r->ipset.ptr->family != r->family)
91 warn_elem(e, "refers to ipset with different family");
95 if (r->ip_src.family && r->ip_src.family != r->family)
97 warn_elem(e, "uses source ip with different family");
101 if (r->ip_dest.family && r->ip_dest.family != r->family)
103 warn_elem(e, "uses destination ip with different family");
107 if (r->ip_redir.family && r->ip_redir.family != r->family)
109 warn_elem(e, "uses redirect ip with different family");
117 compare_addr(struct fw3_address *a, struct fw3_address *b)
121 if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
124 mask = htonl(~((1 << (32 - a->mask)) - 1));
126 return ((a->address.v4.s_addr & mask) == (b->address.v4.s_addr & mask));
130 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
131 struct fw3_state *state)
133 struct fw3_zone *zone;
134 struct fw3_address *addr;
135 struct list_head *addrs;
137 if (!redir->ip_redir.set)
140 list_for_each_entry(zone, &state->zones, list)
142 addrs = fw3_resolve_zone_addresses(zone);
147 list_for_each_entry(addr, addrs, list)
149 if (!compare_addr(addr, &redir->ip_redir))
152 strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name));
153 redir->dest.set = true;
159 fw3_free_list(addrs);
169 check_local(struct uci_element *e, struct fw3_redirect *redir,
170 struct fw3_state *state)
172 struct fw3_zone *zone;
173 struct fw3_device *net;
174 struct fw3_address *addr, *tmp;
176 if (redir->target != FW3_FLAG_DNAT)
179 if (!redir->ip_redir.set)
185 list_for_each_entry(zone, &state->zones, list)
187 list_for_each_entry(net, &zone->networks, list)
191 fw3_ubus_address(&addrs, net->name);
192 list_for_each_entry_safe(addr, tmp, &addrs, list)
194 if (compare_addr(&redir->ip_redir, addr)) {
195 warn_elem(e, "refers to a destination address on this router, "
196 "assuming port redirection");
202 list_del(&addr->list);
215 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
217 struct uci_section *s;
218 struct uci_element *e;
219 struct fw3_redirect *redir;
223 INIT_LIST_HEAD(&state->redirects);
225 uci_foreach_element(&p->sections, e)
227 s = uci_to_section(e);
229 if (strcmp(s->type, "redirect"))
232 redir = calloc(1, sizeof(*redir));
236 INIT_LIST_HEAD(&redir->proto);
237 INIT_LIST_HEAD(&redir->mac_src);
239 redir->enabled = true;
240 redir->reflection = true;
244 if (!fw3_parse_options(redir, fw3_redirect_opts, s))
246 warn_elem(e, "skipped due to invalid options");
247 fw3_free_redirect(redir);
253 fw3_free_redirect(redir);
257 if (redir->src.invert)
259 warn_elem(e, "must not have an inverted source");
260 fw3_free_redirect(redir);
263 else if (redir->src.set && !redir->src.any &&
264 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
266 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
267 fw3_free_redirect(redir);
270 else if (redir->dest.set && !redir->dest.any &&
271 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
273 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
274 fw3_free_redirect(redir);
277 else if (redir->ipset.set && state->disable_ipsets)
279 warn_elem(e, "skipped due to disabled ipset support");
280 fw3_free_redirect(redir);
283 else if (redir->ipset.set &&
284 !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
286 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
287 fw3_free_redirect(redir);
291 if (!check_families(e, redir))
293 fw3_free_redirect(redir);
297 if (redir->target == FW3_FLAG_UNSPEC)
299 warn_elem(e, "has no target specified, defaulting to DNAT");
300 redir->target = FW3_FLAG_DNAT;
302 else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
304 warn_elem(e, "has invalid target specified, defaulting to DNAT");
305 redir->target = FW3_FLAG_DNAT;
308 if (redir->target == FW3_FLAG_DNAT)
311 warn_elem(e, "must not have source '*' for DNAT target");
312 else if (!redir->_src)
313 warn_elem(e, "has no source specified");
316 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
317 redir->_src->conntrack = true;
321 if (!check_local(e, redir, state) && !redir->dest.set &&
322 resolve_dest(e, redir, state))
324 warn_elem(e, "does not specify a destination, assuming '%s'",
328 if (redir->reflection && redir->_dest && redir->_src->masq)
330 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
331 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
332 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
338 warn_elem(e, "must not have destination '*' for SNAT target");
339 else if (!redir->_dest)
340 warn_elem(e, "has no destination specified");
341 else if (!redir->ip_dest.set)
342 warn_elem(e, "has no src_dip option specified");
343 else if (!list_empty(&redir->mac_src))
344 warn_elem(e, "must not use 'src_mac' option for SNAT target");
347 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
348 redir->_dest->conntrack = true;
353 if (list_empty(&redir->proto))
355 warn_elem(e, "does not specify a protocol, assuming TCP+UDP");
356 fw3_parse_protocol(&redir->proto, "tcpudp", true);
361 fw3_free_redirect(redir);
365 if (!redir->port_redir.set)
366 redir->port_redir = redir->port_dest;
368 list_add_tail(&redir->list, &state->redirects);
373 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
375 if (redir->target == FW3_FLAG_DNAT)
376 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
378 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
382 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
383 struct fw3_address *addr, struct fw3_port *port)
385 char buf[sizeof("255.255.255.255:65535-65535\0")];
389 if (addr && addr->set)
391 inet_ntop(AF_INET, &addr->address.v4, buf, sizeof(buf));
394 if (port && port->set)
396 if (port->port_min == port->port_max)
397 sprintf(buf + strlen(buf), ":%u", port->port_min);
399 sprintf(buf + strlen(buf), ":%u-%u",
400 port->port_min, port->port_max);
403 if (target == FW3_FLAG_DNAT)
405 fw3_ipt_rule_target(r, "DNAT");
406 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
410 fw3_ipt_rule_target(r, "SNAT");
411 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
416 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
418 if (redir->target == FW3_FLAG_DNAT)
419 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
421 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
425 set_comment(struct fw3_ipt_rule *r, const char *name, int num, bool ref)
430 fw3_ipt_rule_comment(r, "%s (reflection)", name);
432 fw3_ipt_rule_comment(r, name);
437 fw3_ipt_rule_comment(r, "@redirect[%u] (reflection)", num);
439 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
444 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
445 struct fw3_redirect *redir, int num,
446 struct fw3_protocol *proto, struct fw3_mac *mac)
448 struct fw3_ipt_rule *r;
449 struct fw3_address *src, *dst;
450 struct fw3_port *spt, *dpt;
455 src = &redir->ip_src;
456 dst = &redir->ip_dest;
457 spt = &redir->port_src;
458 dpt = &redir->port_dest;
460 if (redir->target == FW3_FLAG_SNAT)
462 dst = &redir->ip_redir;
463 dpt = &redir->port_redir;
466 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
467 fw3_ipt_rule_sport_dport(r, spt, dpt);
468 fw3_ipt_rule_mac(r, mac);
469 fw3_ipt_rule_ipset(r, &redir->ipset);
470 fw3_ipt_rule_limit(r, &redir->limit);
471 fw3_ipt_rule_time(r, &redir->time);
472 fw3_ipt_rule_mark(r, &redir->mark);
473 set_target_nat(r, redir);
474 fw3_ipt_rule_extra(r, redir->extra);
475 set_comment(r, redir->name, num, false);
476 append_chain_nat(r, redir);
485 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
486 struct fw3_redirect *redir, int num,
487 struct fw3_protocol *proto, struct fw3_address *ra,
488 struct fw3_address *ia, struct fw3_address *ea)
490 struct fw3_ipt_rule *r;
495 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
496 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
497 fw3_ipt_rule_limit(r, &redir->limit);
498 fw3_ipt_rule_time(r, &redir->time);
499 set_comment(r, redir->name, num, true);
500 set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
501 fw3_ipt_rule_replace(r, "zone_%s_prerouting", redir->dest.name);
503 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
504 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
505 fw3_ipt_rule_limit(r, &redir->limit);
506 fw3_ipt_rule_time(r, &redir->time);
507 set_comment(r, redir->name, num, true);
508 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
509 fw3_ipt_rule_replace(r, "zone_%s_postrouting", redir->dest.name);
518 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
519 struct fw3_redirect *redir, int num)
521 struct list_head *ext_addrs, *int_addrs;
522 struct fw3_address *ext_addr, *int_addr, ref_addr;
523 struct fw3_protocol *proto;
527 info(" * Redirect '%s'", redir->name);
529 info(" * Redirect #%u", num);
531 if (!fw3_is_family(redir->_src, handle->family) ||
532 !fw3_is_family(redir->_dest, handle->family))
534 info(" ! Skipping due to different family of zone");
538 if (!fw3_is_family(&redir->ip_src, handle->family) ||
539 !fw3_is_family(&redir->ip_dest, handle->family) ||
540 !fw3_is_family(&redir->ip_redir, handle->family))
542 if (!redir->ip_src.resolved ||
543 !redir->ip_dest.resolved ||
544 !redir->ip_redir.resolved)
545 info(" ! Skipping due to different family of ip address");
550 if (redir->ipset.ptr)
552 if (!fw3_is_family(redir->ipset.ptr, handle->family))
554 info(" ! Skipping due to different family in ipset");
558 if (!fw3_check_ipset(redir->ipset.ptr))
560 info(" ! Skipping due to missing ipset '%s'",
561 redir->ipset.ptr->external ?
562 redir->ipset.ptr->external : redir->ipset.ptr->name);
566 set(redir->ipset.ptr->flags, handle->family, handle->family);
569 fw3_foreach(proto, &redir->proto)
570 fw3_foreach(mac, &redir->mac_src)
571 print_redirect(handle, state, redir, num, proto, mac);
573 /* reflection rules */
574 if (redir->target != FW3_FLAG_DNAT || !redir->reflection)
577 if (!redir->_dest || !redir->_src->masq)
580 ext_addrs = fw3_resolve_zone_addresses(redir->_src);
581 int_addrs = fw3_resolve_zone_addresses(redir->_dest);
583 if (!ext_addrs || !int_addrs)
586 list_for_each_entry(ext_addr, ext_addrs, list)
588 if (!fw3_is_family(ext_addr, handle->family))
591 list_for_each_entry(int_addr, int_addrs, list)
593 if (!fw3_is_family(int_addr, handle->family))
596 fw3_foreach(proto, &redir->proto)
601 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
602 ref_addr = *int_addr;
604 ref_addr = *ext_addr;
609 print_reflection(handle, state, redir, num, proto,
610 &ref_addr, int_addr, ext_addr);
616 fw3_free_list(ext_addrs);
617 fw3_free_list(int_addrs);
621 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
624 struct fw3_redirect *redir;
626 if (handle->family == FW3_FAMILY_V6)
629 if (handle->table != FW3_TABLE_FILTER && handle->table != FW3_TABLE_NAT)
632 list_for_each_entry(redir, &state->redirects, list)
633 expand_redirect(handle, state, redir, num++);