2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013 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)
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 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
171 struct uci_section *s;
172 struct uci_element *e;
173 struct fw3_redirect *redir;
177 INIT_LIST_HEAD(&state->redirects);
179 uci_foreach_element(&p->sections, e)
181 s = uci_to_section(e);
183 if (strcmp(s->type, "redirect"))
186 redir = malloc(sizeof(*redir));
191 memset(redir, 0, sizeof(*redir));
193 INIT_LIST_HEAD(&redir->proto);
194 INIT_LIST_HEAD(&redir->mac_src);
196 redir->enabled = true;
197 redir->reflection = true;
201 fw3_parse_options(redir, fw3_redirect_opts, s);
205 fw3_free_redirect(redir);
209 if (redir->src.invert)
211 warn_elem(e, "must not have an inverted source");
212 fw3_free_redirect(redir);
215 else if (redir->src.set && !redir->src.any &&
216 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
218 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
219 fw3_free_redirect(redir);
222 else if (redir->dest.set && !redir->dest.any &&
223 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
225 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
226 fw3_free_redirect(redir);
229 else if (redir->ipset.set && state->disable_ipsets)
231 warn_elem(e, "skipped due to disabled ipset support");
232 fw3_free_redirect(redir);
235 else if (redir->ipset.set &&
236 !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
238 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
239 fw3_free_redirect(redir);
243 if (!check_families(e, redir))
245 fw3_free_redirect(redir);
249 if (redir->target == FW3_FLAG_UNSPEC)
251 warn_elem(e, "has no target specified, defaulting to DNAT");
252 redir->target = FW3_FLAG_DNAT;
254 else if (redir->target < FW3_FLAG_DNAT)
256 warn_elem(e, "has invalid target specified, defaulting to DNAT");
257 redir->target = FW3_FLAG_DNAT;
260 if (redir->target == FW3_FLAG_DNAT)
263 warn_elem(e, "must not have source '*' for DNAT target");
264 else if (!redir->_src)
265 warn_elem(e, "has no source specified");
268 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
269 redir->_src->conntrack = true;
273 if (!redir->dest.set && resolve_dest(e, redir, state))
275 warn_elem(e, "does not specify a destination, assuming '%s'",
279 if (redir->reflection && redir->_dest && redir->_src->masq)
281 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
282 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
283 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
289 warn_elem(e, "must not have destination '*' for SNAT target");
290 else if (!redir->_dest)
291 warn_elem(e, "has no destination specified");
292 else if (!redir->ip_dest.set)
293 warn_elem(e, "has no src_dip option specified");
294 else if (!list_empty(&redir->mac_src))
295 warn_elem(e, "must not use 'src_mac' option for SNAT target");
298 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
299 redir->_dest->conntrack = true;
304 if (list_empty(&redir->proto))
306 warn_elem(e, "does not specify a protocol, assuming TCP+UDP");
307 fw3_parse_protocol(&redir->proto, "tcpudp", true);
312 fw3_free_redirect(redir);
316 if (!redir->port_redir.set)
317 redir->port_redir = redir->port_dest;
319 list_add_tail(&redir->list, &state->redirects);
324 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
326 if (redir->target == FW3_FLAG_DNAT)
327 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
329 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
333 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
334 struct fw3_address *addr, struct fw3_port *port)
336 char buf[sizeof("255.255.255.255:65535-65535\0")];
340 if (addr && addr->set)
342 inet_ntop(AF_INET, &addr->address.v4, buf, sizeof(buf));
345 if (port && port->set)
347 if (port->port_min == port->port_max)
348 sprintf(buf + strlen(buf), ":%u", port->port_min);
350 sprintf(buf + strlen(buf), ":%u-%u",
351 port->port_min, port->port_max);
354 if (target == FW3_FLAG_DNAT)
356 fw3_ipt_rule_target(r, "DNAT");
357 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
361 fw3_ipt_rule_target(r, "SNAT");
362 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
367 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
369 if (redir->target == FW3_FLAG_DNAT)
370 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
372 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
376 append_chain_filter(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
378 if (redir->target == FW3_FLAG_DNAT)
380 /* XXX: check for local ip */
381 if (!redir->ip_redir.set)
382 fw3_ipt_rule_append(r, "zone_%s_input", redir->src.name);
384 fw3_ipt_rule_append(r, "zone_%s_forward", redir->src.name);
388 if (redir->src.set && !redir->src.any)
389 fw3_ipt_rule_append(r, "zone_%s_forward", redir->src.name);
391 fw3_ipt_rule_append(r, "delegate_forward");
396 set_target_filter(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
398 /* XXX: check for local ip */
399 if (redir->target == FW3_FLAG_DNAT && !redir->ip_redir.set)
400 fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
402 fw3_ipt_rule_target(r, "ACCEPT");
406 set_comment(struct fw3_ipt_rule *r, const char *name, int num, bool ref)
411 fw3_ipt_rule_comment(r, "%s (reflection)", name);
413 fw3_ipt_rule_comment(r, name);
418 fw3_ipt_rule_comment(r, "@redirect[%u] (reflection)", num);
420 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
425 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
426 struct fw3_redirect *redir, int num,
427 struct fw3_protocol *proto, struct fw3_mac *mac)
429 struct fw3_ipt_rule *r;
430 struct fw3_address *src, *dst;
431 struct fw3_port *spt, *dpt;
436 src = &redir->ip_src;
437 dst = &redir->ip_dest;
438 spt = &redir->port_src;
439 dpt = &redir->port_dest;
441 if (redir->target == FW3_FLAG_SNAT)
443 dst = &redir->ip_redir;
444 dpt = &redir->port_redir;
447 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
448 fw3_ipt_rule_sport_dport(r, spt, dpt);
449 fw3_ipt_rule_mac(r, mac);
450 fw3_ipt_rule_ipset(r, &redir->ipset);
451 fw3_ipt_rule_limit(r, &redir->limit);
452 fw3_ipt_rule_time(r, &redir->time);
453 fw3_ipt_rule_mark(r, &redir->mark);
454 set_target_nat(r, redir);
455 fw3_ipt_rule_extra(r, redir->extra);
456 set_comment(r, redir->name, num, false);
457 append_chain_nat(r, redir);
460 case FW3_TABLE_FILTER:
461 src = &redir->ip_src;
462 dst = &redir->ip_redir;
463 spt = &redir->port_src;
464 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_filter(r, redir);
474 fw3_ipt_rule_extra(r, redir->extra);
475 set_comment(r, redir->name, num, false);
476 append_chain_filter(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_append(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_append(r, "zone_%s_postrouting", redir->dest.name);
512 case FW3_TABLE_FILTER:
513 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
514 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
515 fw3_ipt_rule_limit(r, &redir->limit);
516 fw3_ipt_rule_time(r, &redir->time);
517 set_comment(r, redir->name, num, true);
518 fw3_ipt_rule_target(r, "zone_%s_dest_ACCEPT", redir->dest.name);
519 fw3_ipt_rule_append(r, "zone_%s_forward", redir->dest.name);
528 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
529 struct fw3_redirect *redir, int num)
531 struct list_head *ext_addrs, *int_addrs;
532 struct fw3_address *ext_addr, *int_addr, ref_addr;
533 struct fw3_protocol *proto;
537 info(" * Redirect '%s'", redir->name);
539 info(" * Redirect #%u", num);
541 if (!fw3_is_family(redir->_src, handle->family) ||
542 !fw3_is_family(redir->_dest, handle->family))
544 info(" ! Skipping due to different family of zone");
548 if (!fw3_is_family(&redir->ip_src, handle->family) ||
549 !fw3_is_family(&redir->ip_dest, handle->family) ||
550 !fw3_is_family(&redir->ip_redir, handle->family))
552 if (!redir->ip_src.resolved ||
553 !redir->ip_dest.resolved ||
554 !redir->ip_redir.resolved)
555 info(" ! Skipping due to different family of ip address");
560 if (redir->ipset.ptr)
562 if (!fw3_is_family(redir->ipset.ptr, handle->family))
564 info(" ! Skipping due to different family in ipset");
568 if (!fw3_check_ipset(redir->ipset.ptr))
570 info(" ! Skipping due to missing ipset '%s'",
571 redir->ipset.ptr->external ?
572 redir->ipset.ptr->external : redir->ipset.ptr->name);
576 set(redir->ipset.ptr->flags, handle->family, handle->family);
579 fw3_foreach(proto, &redir->proto)
580 fw3_foreach(mac, &redir->mac_src)
581 print_redirect(handle, state, redir, num, proto, mac);
583 /* reflection rules */
584 if (redir->target != FW3_FLAG_DNAT || !redir->reflection)
587 if (!redir->_dest || !redir->_src->masq)
590 ext_addrs = fw3_resolve_zone_addresses(redir->_src);
591 int_addrs = fw3_resolve_zone_addresses(redir->_dest);
593 if (!ext_addrs || !int_addrs)
596 list_for_each_entry(ext_addr, ext_addrs, list)
598 if (!fw3_is_family(ext_addr, handle->family))
601 list_for_each_entry(int_addr, int_addrs, list)
603 if (!fw3_is_family(int_addr, handle->family))
606 fw3_foreach(proto, &redir->proto)
608 if (!proto || (proto->protocol != 6 && proto->protocol != 17))
611 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
612 ref_addr = *int_addr;
614 ref_addr = *ext_addr;
619 print_reflection(handle, state, redir, num, proto,
620 &ref_addr, int_addr, ext_addr);
626 fw3_free_list(ext_addrs);
627 fw3_free_list(int_addrs);
631 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
634 struct fw3_redirect *redir;
636 if (handle->family == FW3_FAMILY_V6)
639 if (handle->table != FW3_TABLE_FILTER && handle->table != FW3_TABLE_NAT)
642 list_for_each_entry(redir, &state->redirects, list)
643 expand_redirect(handle, state, redir, num++);