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", device, 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("utc_time", bool, redirect, time.utc),
48 FW3_OPT("start_date", date, redirect, time.datestart),
49 FW3_OPT("stop_date", date, redirect, time.datestop),
50 FW3_OPT("start_time", time, redirect, time.timestart),
51 FW3_OPT("stop_time", time, redirect, time.timestop),
52 FW3_OPT("weekdays", weekdays, redirect, time.weekdays),
53 FW3_OPT("monthdays", monthdays, redirect, time.monthdays),
55 FW3_OPT("mark", mark, redirect, mark),
57 FW3_OPT("reflection", bool, redirect, reflection),
58 FW3_OPT("reflection_src", reflection_source,
59 redirect, reflection_src),
61 FW3_OPT("target", target, redirect, target),
68 check_families(struct uci_element *e, struct fw3_redirect *r)
70 if (r->family == FW3_FAMILY_ANY)
73 if (r->_src && r->_src->family && r->_src->family != r->family)
75 warn_elem(e, "refers to source zone with different family");
79 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
81 warn_elem(e, "refers to destination zone with different family");
85 if (r->_ipset && r->_ipset->family && r->_ipset->family != r->family)
87 warn_elem(e, "refers to ipset with different family");
91 if (r->ip_src.family && r->ip_src.family != r->family)
93 warn_elem(e, "uses source ip with different family");
97 if (r->ip_dest.family && r->ip_dest.family != r->family)
99 warn_elem(e, "uses destination ip with different family");
103 if (r->ip_redir.family && r->ip_redir.family != r->family)
105 warn_elem(e, "uses redirect ip with different family");
113 compare_addr(struct fw3_address *a, struct fw3_address *b)
117 if (a->family != FW3_FAMILY_V4)
120 mask = ~((1 << (32 - a->mask)) - 1);
122 return ((a->address.v4.s_addr & mask) == (b->address.v4.s_addr & mask));
126 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
127 struct fw3_state *state)
129 struct fw3_zone *zone;
130 struct fw3_address *addr;
131 struct list_head *addrs;
133 if (!redir->ip_redir.set)
136 list_for_each_entry(zone, &state->zones, list)
138 addrs = fw3_resolve_zone_addresses(zone);
143 list_for_each_entry(addr, addrs, list)
145 if (!compare_addr(addr, &redir->ip_redir))
148 strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name));
149 redir->dest.set = true;
155 fw3_free_list(addrs);
165 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
167 struct uci_section *s;
168 struct uci_element *e;
169 struct fw3_redirect *redir;
173 INIT_LIST_HEAD(&state->redirects);
175 uci_foreach_element(&p->sections, e)
177 s = uci_to_section(e);
179 if (strcmp(s->type, "redirect"))
182 redir = malloc(sizeof(*redir));
187 memset(redir, 0, sizeof(*redir));
189 INIT_LIST_HEAD(&redir->proto);
190 INIT_LIST_HEAD(&redir->mac_src);
192 redir->enabled = true;
193 redir->reflection = true;
197 fw3_parse_options(redir, fw3_redirect_opts, s);
201 fw3_free_redirect(redir);
205 if (redir->src.invert)
207 warn_elem(e, "must not have an inverted source");
208 fw3_free_redirect(redir);
211 else if (redir->src.set && !redir->src.any &&
212 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
214 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
215 fw3_free_redirect(redir);
218 else if (redir->dest.set && !redir->dest.any &&
219 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
221 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
222 fw3_free_redirect(redir);
225 else if (redir->ipset.set && state->disable_ipsets)
227 warn_elem(e, "skipped due to disabled ipset support");
228 fw3_free_redirect(redir);
231 else if (redir->ipset.set && !redir->ipset.any &&
232 !(redir->_ipset = fw3_lookup_ipset(state, redir->ipset.name)))
234 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
235 fw3_free_redirect(redir);
239 if (!check_families(e, redir))
241 fw3_free_redirect(redir);
245 if (redir->target == FW3_FLAG_UNSPEC)
247 warn_elem(e, "has no target specified, defaulting to DNAT");
248 redir->target = FW3_FLAG_DNAT;
250 else if (redir->target < FW3_FLAG_DNAT)
252 warn_elem(e, "has invalid target specified, defaulting to DNAT");
253 redir->target = FW3_FLAG_DNAT;
256 if (redir->target == FW3_FLAG_DNAT)
259 warn_elem(e, "must not have source '*' for DNAT target");
260 else if (!redir->_src)
261 warn_elem(e, "has no source specified");
264 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
265 redir->_src->conntrack = true;
269 if (!redir->dest.set && resolve_dest(e, redir, state))
271 warn_elem(e, "does not specify a destination, assuming '%s'",
275 if (redir->reflection && redir->_dest && redir->_src->masq)
277 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
278 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
279 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
285 warn_elem(e, "must not have destination '*' for SNAT target");
286 else if (!redir->_dest)
287 warn_elem(e, "has no destination specified");
288 else if (!redir->ip_dest.set)
289 warn_elem(e, "has no src_dip option specified");
290 else if (!list_empty(&redir->mac_src))
291 warn_elem(e, "must not use 'src_mac' option for SNAT target");
294 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
295 redir->_dest->conntrack = true;
300 if (list_empty(&redir->proto))
302 warn_elem(e, "does not specify a protocol, assuming TCP+UDP");
303 fw3_parse_protocol(&redir->proto, "tcpudp", true);
308 fw3_free_redirect(redir);
312 if (!redir->port_redir.set)
313 redir->port_redir = redir->port_dest;
315 list_add_tail(&redir->list, &state->redirects);
320 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
322 if (redir->target == FW3_FLAG_DNAT)
323 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
325 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
329 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
330 struct fw3_address *addr, struct fw3_port *port)
332 char buf[sizeof("255.255.255.255:65535-65535\0")];
336 if (addr && addr->set)
338 inet_ntop(AF_INET, &addr->address.v4, buf, sizeof(buf));
341 if (port && port->set)
343 if (port->port_min == port->port_max)
344 sprintf(buf + strlen(buf), ":%u", port->port_min);
346 sprintf(buf + strlen(buf), ":%u-%u",
347 port->port_min, port->port_max);
350 if (target == FW3_FLAG_DNAT)
352 fw3_ipt_rule_target(r, "DNAT");
353 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
357 fw3_ipt_rule_target(r, "SNAT");
358 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
363 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
365 if (redir->target == FW3_FLAG_DNAT)
366 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
368 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
372 append_chain_filter(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
374 if (redir->target == FW3_FLAG_DNAT)
376 /* XXX: check for local ip */
377 if (!redir->ip_redir.set)
378 fw3_ipt_rule_append(r, "zone_%s_input", redir->src.name);
380 fw3_ipt_rule_append(r, "zone_%s_forward", redir->src.name);
384 if (redir->src.set && !redir->src.any)
385 fw3_ipt_rule_append(r, "zone_%s_forward", redir->src.name);
387 fw3_ipt_rule_append(r, "delegate_forward");
392 set_target_filter(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
394 /* XXX: check for local ip */
395 if (redir->target == FW3_FLAG_DNAT && !redir->ip_redir.set)
396 fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
398 fw3_ipt_rule_target(r, "ACCEPT");
402 set_comment(struct fw3_ipt_rule *r, const char *name, int num, bool ref)
407 fw3_ipt_rule_comment(r, "%s (reflection)", name);
409 fw3_ipt_rule_comment(r, name);
414 fw3_ipt_rule_comment(r, "@redirect[%u] (reflection)", num);
416 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
421 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
422 struct fw3_redirect *redir, int num,
423 struct fw3_protocol *proto, struct fw3_mac *mac)
425 struct fw3_ipt_rule *r;
426 struct fw3_address *src, *dst;
427 struct fw3_port *spt, *dpt;
432 src = &redir->ip_src;
433 dst = &redir->ip_dest;
434 spt = &redir->port_src;
435 dpt = &redir->port_dest;
437 if (redir->target == FW3_FLAG_SNAT)
439 dst = &redir->ip_redir;
440 dpt = &redir->port_redir;
443 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
444 fw3_ipt_rule_sport_dport(r, spt, dpt);
445 fw3_ipt_rule_mac(r, mac);
446 fw3_ipt_rule_ipset(r, redir->_ipset, redir->ipset.invert);
447 fw3_ipt_rule_time(r, &redir->time);
448 fw3_ipt_rule_mark(r, &redir->mark);
449 set_target_nat(r, redir);
450 fw3_ipt_rule_extra(r, redir->extra);
451 set_comment(r, redir->name, num, false);
452 append_chain_nat(r, redir);
455 case FW3_TABLE_FILTER:
456 src = &redir->ip_src;
457 dst = &redir->ip_redir;
458 spt = &redir->port_src;
459 dpt = &redir->port_redir;
461 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
462 fw3_ipt_rule_sport_dport(r, spt, dpt);
463 fw3_ipt_rule_mac(r, mac);
464 fw3_ipt_rule_ipset(r, redir->_ipset, redir->ipset.invert);
465 fw3_ipt_rule_time(r, &redir->time);
466 fw3_ipt_rule_mark(r, &redir->mark);
467 set_target_filter(r, redir);
468 fw3_ipt_rule_extra(r, redir->extra);
469 set_comment(r, redir->name, num, false);
470 append_chain_filter(r, redir);
479 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
480 struct fw3_redirect *redir, int num,
481 struct fw3_protocol *proto, struct fw3_address *ra,
482 struct fw3_address *ia, struct fw3_address *ea)
484 struct fw3_ipt_rule *r;
489 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
490 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
491 fw3_ipt_rule_time(r, &redir->time);
492 set_comment(r, redir->name, num, true);
493 set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
494 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->dest.name);
496 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
497 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
498 fw3_ipt_rule_time(r, &redir->time);
499 set_comment(r, redir->name, num, true);
500 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
501 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
504 case FW3_TABLE_FILTER:
505 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
506 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
507 fw3_ipt_rule_time(r, &redir->time);
508 set_comment(r, redir->name, num, true);
509 fw3_ipt_rule_target(r, "zone_%s_dest_ACCEPT", redir->dest.name);
510 fw3_ipt_rule_append(r, "zone_%s_forward", redir->dest.name);
519 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
520 struct fw3_redirect *redir, int num)
522 struct list_head *ext_addrs, *int_addrs;
523 struct fw3_address *ext_addr, *int_addr, ref_addr;
524 struct fw3_protocol *proto;
528 info(" * Redirect '%s'", redir->name);
530 info(" * Redirect #%u", num);
532 if (!fw3_is_family(redir->_src, handle->family) ||
533 !fw3_is_family(redir->_dest, handle->family))
535 info(" ! Skipping due to different family of zone");
539 if (!fw3_is_family(&redir->ip_src, handle->family) ||
540 !fw3_is_family(&redir->ip_dest, handle->family) ||
541 !fw3_is_family(&redir->ip_redir, handle->family))
543 if (!redir->ip_src.resolved ||
544 !redir->ip_dest.resolved ||
545 !redir->ip_redir.resolved)
546 info(" ! Skipping due to different family of ip address");
553 if (!fw3_is_family(redir->_ipset, handle->family))
555 info(" ! Skipping due to different family in ipset");
559 if (!fw3_check_ipset(redir->_ipset))
561 info(" ! Skipping due to missing ipset '%s'",
562 redir->_ipset->external ?
563 redir->_ipset->external : redir->_ipset->name);
567 set(redir->_ipset->flags, handle->family, handle->family);
570 fw3_foreach(proto, &redir->proto)
571 fw3_foreach(mac, &redir->mac_src)
572 print_redirect(handle, state, redir, num, proto, mac);
574 /* reflection rules */
575 if (redir->target != FW3_FLAG_DNAT || !redir->reflection)
578 if (!redir->_dest || !redir->_src->masq)
581 ext_addrs = fw3_resolve_zone_addresses(redir->_src);
582 int_addrs = fw3_resolve_zone_addresses(redir->_dest);
584 if (!ext_addrs || !int_addrs)
587 list_for_each_entry(ext_addr, ext_addrs, list)
589 if (!fw3_is_family(ext_addr, handle->family))
592 list_for_each_entry(int_addr, int_addrs, list)
594 if (!fw3_is_family(int_addr, handle->family))
597 fw3_foreach(proto, &redir->proto)
599 if (!proto || (proto->protocol != 6 && proto->protocol != 17))
602 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
603 ref_addr = *int_addr;
605 ref_addr = *ext_addr;
610 print_reflection(handle, state, redir, num, proto,
611 &ref_addr, int_addr, ext_addr);
617 fw3_free_list(ext_addrs);
618 fw3_free_list(int_addrs);
622 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
625 struct fw3_redirect *redir;
627 if (handle->family == FW3_FAMILY_V6)
630 if (handle->table != FW3_TABLE_FILTER && handle->table != FW3_TABLE_NAT)
633 list_for_each_entry(redir, &state->redirects, list)
634 expand_redirect(handle, state, redir, num++);