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", address, 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", address, redirect, ip_dest),
40 FW3_OPT("src_dport", port, redirect, port_dest),
42 FW3_OPT("dest_ip", address, 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 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
115 struct uci_section *s;
116 struct uci_element *e;
117 struct fw3_redirect *redir;
121 INIT_LIST_HEAD(&state->redirects);
123 uci_foreach_element(&p->sections, e)
125 s = uci_to_section(e);
127 if (strcmp(s->type, "redirect"))
130 redir = malloc(sizeof(*redir));
135 memset(redir, 0, sizeof(*redir));
137 INIT_LIST_HEAD(&redir->proto);
138 INIT_LIST_HEAD(&redir->mac_src);
140 redir->enabled = true;
141 redir->reflection = true;
145 fw3_parse_options(redir, fw3_redirect_opts, s);
149 fw3_free_redirect(redir);
153 if (redir->src.invert)
155 warn_elem(e, "must not have an inverted source");
156 fw3_free_redirect(redir);
159 else if (redir->src.set && !redir->src.any &&
160 !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
162 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
163 fw3_free_redirect(redir);
166 else if (redir->dest.set && !redir->dest.any &&
167 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
169 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
170 fw3_free_redirect(redir);
173 else if (redir->ipset.set && state->disable_ipsets)
175 warn_elem(e, "skipped due to disabled ipset support");
176 fw3_free_redirect(redir);
179 else if (redir->ipset.set && !redir->ipset.any &&
180 !(redir->_ipset = fw3_lookup_ipset(state, redir->ipset.name)))
182 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
183 fw3_free_redirect(redir);
187 if (!check_families(e, redir))
189 fw3_free_redirect(redir);
193 if (redir->target == FW3_FLAG_UNSPEC)
195 warn_elem(e, "has no target specified, defaulting to DNAT");
196 redir->target = FW3_FLAG_DNAT;
198 else if (redir->target < FW3_FLAG_DNAT)
200 warn_elem(e, "has invalid target specified, defaulting to DNAT");
201 redir->target = FW3_FLAG_DNAT;
204 if (redir->target == FW3_FLAG_DNAT)
207 warn_elem(e, "must not have source '*' for DNAT target");
208 else if (!redir->_src)
209 warn_elem(e, "has no source specified");
212 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
213 redir->_src->conntrack = true;
217 if (redir->reflection && redir->_dest && redir->_src->masq)
219 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
220 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
221 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
227 warn_elem(e, "must not have destination '*' for SNAT target");
228 else if (!redir->_dest)
229 warn_elem(e, "has no destination specified");
230 else if (!redir->ip_dest.set)
231 warn_elem(e, "has no src_dip option specified");
232 else if (!list_empty(&redir->mac_src))
233 warn_elem(e, "must not use 'src_mac' option for SNAT target");
236 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
237 redir->_dest->conntrack = true;
242 if (list_empty(&redir->proto))
244 warn_elem(e, "does not specify a protocol, assuming TCP+UDP");
245 fw3_parse_protocol(&redir->proto, "tcpudp", true);
250 fw3_free_redirect(redir);
254 if (!redir->port_redir.set)
255 redir->port_redir = redir->port_dest;
257 list_add_tail(&redir->list, &state->redirects);
262 print_chain_nat(struct fw3_redirect *redir)
264 if (redir->target == FW3_FLAG_DNAT)
265 fw3_pr("-A zone_%s_prerouting", redir->src.name);
267 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
271 print_snat_dnat(enum fw3_flag target,
272 struct fw3_address *addr, struct fw3_port *port)
274 char s[sizeof("255.255.255.255 ")];
276 if (target == FW3_FLAG_DNAT)
277 fw3_pr(" -j DNAT --to-destination ");
279 fw3_pr(" -j SNAT --to-source ");
281 if (addr && addr->set)
283 inet_ntop(AF_INET, &addr->address.v4, s, sizeof(s));
287 if (port && port->set)
289 if (port->port_min == port->port_max)
290 fw3_pr(":%u", port->port_min);
292 fw3_pr(":%u-%u", port->port_min, port->port_max);
299 print_target_nat(struct fw3_redirect *redir)
301 if (redir->target == FW3_FLAG_DNAT)
302 print_snat_dnat(redir->target, &redir->ip_redir, &redir->port_redir);
304 print_snat_dnat(redir->target, &redir->ip_dest, &redir->port_dest);
308 print_chain_filter(struct fw3_redirect *redir)
310 if (redir->target == FW3_FLAG_DNAT)
312 /* XXX: check for local ip */
313 if (!redir->ip_redir.set)
314 fw3_pr("-A zone_%s_input", redir->src.name);
316 fw3_pr("-A zone_%s_forward", redir->src.name);
320 if (redir->src.set && !redir->src.any)
321 fw3_pr("-A zone_%s_forward", redir->src.name);
323 fw3_pr("-A delegate_forward");
328 print_target_filter(struct fw3_redirect *redir)
330 /* XXX: check for local ip */
331 if (redir->target == FW3_FLAG_DNAT && !redir->ip_redir.set)
332 fw3_pr(" -m conntrack --ctstate DNAT -j ACCEPT\n");
334 fw3_pr(" -j ACCEPT\n");
338 print_redirect(struct fw3_state *state, enum fw3_family family,
339 enum fw3_table table, struct fw3_redirect *redir, int num)
341 struct list_head *ext_addrs, *int_addrs;
342 struct fw3_address *ext_addr, *int_addr, ref_addr;
343 struct fw3_device *ext_net, *int_net;
344 struct fw3_protocol *proto;
348 info(" * Redirect '%s'", redir->name);
350 info(" * Redirect #%u", num);
352 if (!fw3_is_family(redir->_src, family) ||
353 !fw3_is_family(redir->_dest, family))
355 info(" ! Skipping due to different family of zone");
359 if (!fw3_is_family(&redir->ip_src, family) ||
360 !fw3_is_family(&redir->ip_dest, family) ||
361 !fw3_is_family(&redir->ip_redir, family))
363 info(" ! Skipping due to different family of ip address");
369 if (!fw3_is_family(redir->_ipset, family))
371 info(" ! Skipping due to different family in ipset");
375 if (!fw3_check_ipset(redir->_ipset))
377 info(" ! Skipping due to missing ipset '%s'",
378 redir->_ipset->external ?
379 redir->_ipset->external : redir->_ipset->name);
383 set(redir->_ipset->flags, family, family);
386 fw3_foreach(proto, &redir->proto)
387 fw3_foreach(mac, &redir->mac_src)
389 if (table == FW3_TABLE_NAT)
391 print_chain_nat(redir);
392 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
393 fw3_format_protocol(proto, family);
395 if (redir->target == FW3_FLAG_DNAT)
397 fw3_format_src_dest(&redir->ip_src, &redir->ip_dest);
398 fw3_format_sport_dport(&redir->port_src, &redir->port_dest);
402 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
403 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
407 fw3_format_time(&redir->time);
408 fw3_format_mark(&redir->mark);
409 fw3_format_extra(redir->extra);
410 fw3_format_comment(redir->name);
411 print_target_nat(redir);
413 else if (table == FW3_TABLE_FILTER)
415 print_chain_filter(redir);
416 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
417 fw3_format_protocol(proto, family);
418 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
419 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
421 fw3_format_time(&redir->time);
422 fw3_format_mark(&redir->mark);
423 fw3_format_extra(redir->extra);
424 fw3_format_comment(redir->name);
425 print_target_filter(redir);
429 /* reflection rules */
430 if (redir->target != FW3_FLAG_DNAT || !redir->reflection)
433 if (!redir->_dest || !redir->_src->masq)
436 list_for_each_entry(ext_net, &redir->_src->networks, list)
438 ext_addrs = fw3_ubus_address(ext_net->name);
440 if (!ext_addrs || list_empty(ext_addrs))
443 list_for_each_entry(int_net, &redir->_dest->networks, list)
445 int_addrs = fw3_ubus_address(int_net->name);
447 if (!int_addrs || list_empty(int_addrs))
450 fw3_foreach(ext_addr, ext_addrs)
451 fw3_foreach(int_addr, int_addrs)
452 fw3_foreach(proto, &redir->proto)
454 if (!fw3_is_family(int_addr, family) ||
455 !fw3_is_family(ext_addr, family))
458 if (!proto || (proto->protocol != 6 && proto->protocol != 17))
461 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
462 ref_addr = *int_addr;
464 ref_addr = *ext_addr;
469 if (table == FW3_TABLE_NAT)
471 fw3_pr("-A zone_%s_prerouting", redir->dest.name);
472 fw3_format_protocol(proto, family);
473 fw3_format_src_dest(int_addr, ext_addr);
474 fw3_format_sport_dport(NULL, &redir->port_dest);
475 fw3_format_time(&redir->time);
476 fw3_format_comment(redir->name, " (reflection)");
477 print_snat_dnat(FW3_FLAG_DNAT,
478 &redir->ip_redir, &redir->port_redir);
480 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
481 fw3_format_protocol(proto, family);
482 fw3_format_src_dest(int_addr, &redir->ip_redir);
483 fw3_format_sport_dport(NULL, &redir->port_redir);
484 fw3_format_time(&redir->time);
485 fw3_format_comment(redir->name, " (reflection)");
486 print_snat_dnat(FW3_FLAG_SNAT, &ref_addr, NULL);
488 else if (table == FW3_TABLE_FILTER)
490 fw3_pr("-A zone_%s_forward", redir->dest.name);
491 fw3_format_protocol(proto, family);
492 fw3_format_src_dest(int_addr, &redir->ip_redir);
493 fw3_format_sport_dport(NULL, &redir->port_redir);
494 fw3_format_time(&redir->time);
495 fw3_format_comment(redir->name, " (reflection)");
496 fw3_pr(" -j zone_%s_dest_ACCEPT\n", redir->dest.name);
500 fw3_ubus_address_free(int_addrs);
503 fw3_ubus_address_free(ext_addrs);
508 fw3_print_redirects(struct fw3_state *state, enum fw3_family family,
509 enum fw3_table table)
512 struct fw3_redirect *redir;
514 if (family == FW3_FAMILY_V6)
517 if (table != FW3_TABLE_FILTER && table != FW3_TABLE_NAT)
520 list_for_each_entry(redir, &state->redirects, list)
521 print_redirect(state, family, table, redir, num++);