2 * firewall3 - 3rd OpenWrt UCI firewall implementation
4 * Copyright (C) 2013-2014 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),
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)
119 if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
122 return ((a->address.v4.s_addr & a->mask.v4.s_addr) ==
123 (b->address.v4.s_addr & a->mask.v4.s_addr));
127 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
128 struct fw3_state *state)
130 struct fw3_zone *zone;
131 struct fw3_address *addr;
132 struct list_head *addrs;
134 if (!redir->ip_redir.set)
137 list_for_each_entry(zone, &state->zones, list)
139 addrs = fw3_resolve_zone_addresses(zone, NULL);
144 list_for_each_entry(addr, addrs, list)
146 if (!compare_addr(addr, &redir->ip_redir))
149 strncpy(redir->dest.name, zone->name, sizeof(redir->dest.name));
150 redir->dest.set = true;
156 fw3_free_list(addrs);
166 check_local(struct uci_element *e, struct fw3_redirect *redir,
167 struct fw3_state *state)
169 if (redir->target != FW3_FLAG_DNAT)
172 if (!redir->ip_redir.set)
179 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
181 struct uci_section *s;
182 struct uci_element *e;
183 struct fw3_redirect *redir;
187 INIT_LIST_HEAD(&state->redirects);
189 uci_foreach_element(&p->sections, e)
191 s = uci_to_section(e);
193 if (strcmp(s->type, "redirect"))
196 redir = calloc(1, sizeof(*redir));
200 INIT_LIST_HEAD(&redir->proto);
201 INIT_LIST_HEAD(&redir->mac_src);
203 redir->enabled = true;
204 redir->reflection = true;
208 if (!fw3_parse_options(redir, fw3_redirect_opts, s))
210 warn_elem(e, "skipped due to invalid options");
211 fw3_free_redirect(redir);
217 fw3_free_redirect(redir);
221 if (redir->src.invert)
223 warn_elem(e, "must not have an inverted source");
224 fw3_free_redirect(redir);
227 else if (redir->src.set && !redir->src.any &&
228 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
230 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
231 fw3_free_redirect(redir);
234 else if (redir->dest.set && !redir->dest.any &&
235 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
237 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
238 fw3_free_redirect(redir);
241 else if (redir->ipset.set && state->disable_ipsets)
243 warn_elem(e, "skipped due to disabled ipset support");
244 fw3_free_redirect(redir);
247 else if (redir->ipset.set &&
248 !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
250 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
251 fw3_free_redirect(redir);
255 if (!check_families(e, redir))
257 fw3_free_redirect(redir);
261 if (redir->target == FW3_FLAG_UNSPEC)
263 warn_elem(e, "has no target specified, defaulting to DNAT");
264 redir->target = FW3_FLAG_DNAT;
266 else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
268 warn_elem(e, "has invalid target specified, defaulting to DNAT");
269 redir->target = FW3_FLAG_DNAT;
272 if (redir->target == FW3_FLAG_DNAT)
275 warn_elem(e, "must not have source '*' for DNAT target");
276 else if (!redir->_src)
277 warn_elem(e, "has no source specified");
280 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
283 if (!check_local(e, redir, state) && !redir->dest.set &&
284 resolve_dest(e, redir, state))
286 warn_elem(e, "does not specify a destination, assuming '%s'",
290 if (redir->reflection && redir->_dest && redir->_src->masq)
292 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
293 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
294 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
301 warn_elem(e, "must not have destination '*' for SNAT target");
302 else if (!redir->_dest)
303 warn_elem(e, "has no destination specified");
304 else if (!redir->ip_dest.set)
305 warn_elem(e, "has no src_dip option specified");
306 else if (!list_empty(&redir->mac_src))
307 warn_elem(e, "must not use 'src_mac' option for SNAT target");
310 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
315 if (list_empty(&redir->proto))
317 warn_elem(e, "does not specify a protocol, assuming TCP+UDP");
318 fw3_parse_protocol(&redir->proto, "tcpudp", true);
323 fw3_free_redirect(redir);
327 if (!redir->port_redir.set)
328 redir->port_redir = redir->port_dest;
330 list_add_tail(&redir->list, &state->redirects);
335 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
337 if (redir->target == FW3_FLAG_DNAT)
338 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
340 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
344 set_redirect(struct fw3_ipt_rule *r, struct fw3_port *port)
346 char buf[sizeof("65535-65535\0")];
348 fw3_ipt_rule_target(r, "REDIRECT");
350 if (port && port->set)
352 if (port->port_min == port->port_max)
353 sprintf(buf, "%u", port->port_min);
355 sprintf(buf, "%u-%u", port->port_min, port->port_max);
357 fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
362 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
363 struct fw3_address *addr, struct fw3_port *port)
365 char buf[sizeof("255.255.255.255:65535-65535\0")];
369 if (addr && addr->set)
371 inet_ntop(AF_INET, &addr->address.v4, buf, sizeof(buf));
374 if (port && port->set)
376 if (port->port_min == port->port_max)
377 sprintf(buf + strlen(buf), ":%u", port->port_min);
379 sprintf(buf + strlen(buf), ":%u-%u",
380 port->port_min, port->port_max);
383 if (target == FW3_FLAG_DNAT)
385 fw3_ipt_rule_target(r, "DNAT");
386 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
390 fw3_ipt_rule_target(r, "SNAT");
391 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
396 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
399 set_redirect(r, &redir->port_redir);
400 else if (redir->target == FW3_FLAG_DNAT)
401 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
403 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
407 set_comment(struct fw3_ipt_rule *r, const char *name, int num, bool ref)
412 fw3_ipt_rule_comment(r, "%s (reflection)", name);
414 fw3_ipt_rule_comment(r, name);
419 fw3_ipt_rule_comment(r, "@redirect[%u] (reflection)", num);
421 fw3_ipt_rule_comment(r, "@redirect[%u]", num);
426 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
427 struct fw3_redirect *redir, int num,
428 struct fw3_protocol *proto, struct fw3_mac *mac)
430 struct fw3_ipt_rule *r;
431 struct fw3_address *src, *dst;
432 struct fw3_port *spt, *dpt;
437 src = &redir->ip_src;
438 dst = &redir->ip_dest;
439 spt = &redir->port_src;
440 dpt = &redir->port_dest;
442 if (redir->target == FW3_FLAG_SNAT)
444 dst = &redir->ip_redir;
445 dpt = &redir->port_redir;
448 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
449 fw3_ipt_rule_sport_dport(r, spt, dpt);
450 fw3_ipt_rule_mac(r, mac);
451 fw3_ipt_rule_ipset(r, &redir->ipset);
452 fw3_ipt_rule_limit(r, &redir->limit);
453 fw3_ipt_rule_time(r, &redir->time);
454 fw3_ipt_rule_mark(r, &redir->mark);
455 set_target_nat(r, redir);
456 fw3_ipt_rule_extra(r, redir->extra);
457 set_comment(r, redir->name, num, false);
458 append_chain_nat(r, redir);
467 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
468 struct fw3_redirect *redir, int num,
469 struct fw3_protocol *proto, struct fw3_address *ra,
470 struct fw3_address *ia, struct fw3_address *ea)
472 struct fw3_ipt_rule *r;
477 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
478 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
479 fw3_ipt_rule_limit(r, &redir->limit);
480 fw3_ipt_rule_time(r, &redir->time);
481 set_comment(r, redir->name, num, true);
482 set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
483 fw3_ipt_rule_replace(r, "zone_%s_prerouting", redir->dest.name);
485 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
486 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
487 fw3_ipt_rule_limit(r, &redir->limit);
488 fw3_ipt_rule_time(r, &redir->time);
489 set_comment(r, redir->name, num, true);
490 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
491 fw3_ipt_rule_replace(r, "zone_%s_postrouting", redir->dest.name);
500 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
501 struct fw3_redirect *redir, int num)
503 struct list_head *ext_addrs, *int_addrs;
504 struct fw3_address *ext_addr, *int_addr, ref_addr;
505 struct fw3_protocol *proto;
509 info(" * Redirect '%s'", redir->name);
511 info(" * Redirect #%u", num);
513 if (!fw3_is_family(redir->_src, handle->family) ||
514 !fw3_is_family(redir->_dest, handle->family))
516 info(" ! Skipping due to different family of zone");
520 if (!fw3_is_family(&redir->ip_src, handle->family) ||
521 !fw3_is_family(&redir->ip_dest, handle->family) ||
522 !fw3_is_family(&redir->ip_redir, handle->family))
524 if (!redir->ip_src.resolved ||
525 !redir->ip_dest.resolved ||
526 !redir->ip_redir.resolved)
527 info(" ! Skipping due to different family of ip address");
532 if (redir->ipset.ptr)
534 if (!fw3_is_family(redir->ipset.ptr, handle->family))
536 info(" ! Skipping due to different family in ipset");
540 if (!fw3_check_ipset(redir->ipset.ptr))
542 info(" ! Skipping due to missing ipset '%s'",
543 redir->ipset.ptr->external ?
544 redir->ipset.ptr->external : redir->ipset.ptr->name);
548 set(redir->ipset.ptr->flags, handle->family, handle->family);
551 fw3_foreach(proto, &redir->proto)
552 fw3_foreach(mac, &redir->mac_src)
553 print_redirect(handle, state, redir, num, proto, mac);
555 /* reflection rules */
556 if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
559 if (!redir->_dest || !redir->_src->masq)
562 ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
563 int_addrs = fw3_resolve_zone_addresses(redir->_dest, NULL);
565 if (!ext_addrs || !int_addrs)
568 list_for_each_entry(ext_addr, ext_addrs, list)
570 if (!fw3_is_family(ext_addr, handle->family))
573 list_for_each_entry(int_addr, int_addrs, list)
575 if (!fw3_is_family(int_addr, handle->family))
578 fw3_foreach(proto, &redir->proto)
583 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
584 ref_addr = *int_addr;
586 ref_addr = *ext_addr;
588 ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
589 ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
591 print_reflection(handle, state, redir, num, proto,
592 &ref_addr, int_addr, ext_addr);
598 fw3_free_list(ext_addrs);
599 fw3_free_list(int_addrs);
603 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
606 struct fw3_redirect *redir;
608 if (handle->family == FW3_FAMILY_V6)
611 if (handle->table != FW3_TABLE_FILTER && handle->table != FW3_TABLE_NAT)
614 list_for_each_entry(redir, &state->redirects, list)
615 expand_redirect(handle, state, redir, num++);