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("reflection", bool, redirect, reflection),
56 FW3_OPT("reflection_src", reflection_source,
57 redirect, reflection_src),
59 FW3_OPT("target", target, redirect, target),
66 check_families(struct uci_element *e, struct fw3_redirect *r)
68 if (r->family == FW3_FAMILY_ANY)
71 if (r->_src && r->_src->family && r->_src->family != r->family)
73 warn_elem(e, "refers to source zone with different family");
77 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
79 warn_elem(e, "refers to destination zone with different family");
83 if (r->_ipset && r->_ipset->family && r->_ipset->family != r->family)
85 warn_elem(e, "refers to ipset with different family");
89 if (r->ip_src.family && r->ip_src.family != r->family)
91 warn_elem(e, "uses source ip with different family");
95 if (r->ip_dest.family && r->ip_dest.family != r->family)
97 warn_elem(e, "uses destination ip with different family");
101 if (r->ip_redir.family && r->ip_redir.family != r->family)
103 warn_elem(e, "uses redirect ip with different family");
111 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
113 struct uci_section *s;
114 struct uci_element *e;
115 struct fw3_redirect *redir;
119 INIT_LIST_HEAD(&state->redirects);
121 uci_foreach_element(&p->sections, e)
123 s = uci_to_section(e);
125 if (strcmp(s->type, "redirect"))
128 redir = malloc(sizeof(*redir));
133 memset(redir, 0, sizeof(*redir));
135 INIT_LIST_HEAD(&redir->proto);
136 INIT_LIST_HEAD(&redir->mac_src);
138 redir->enabled = true;
139 redir->reflection = true;
143 fw3_parse_options(redir, fw3_redirect_opts, s);
147 fw3_free_redirect(redir);
151 if (redir->src.invert)
153 warn_elem(e, "must not have an inverted source");
154 fw3_free_redirect(redir);
157 else if (redir->src.set && !redir->src.any &&
158 !(redir->_src = fw3_lookup_zone(state, redir->src.name, false)))
160 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
161 fw3_free_redirect(redir);
164 else if (redir->dest.set && !redir->dest.any &&
165 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name, false)))
167 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
168 fw3_free_redirect(redir);
171 else if (redir->ipset.set && state->disable_ipsets)
173 warn_elem(e, "skipped due to disabled ipset support");
174 fw3_free_redirect(redir);
177 else if (redir->ipset.set && !redir->ipset.any &&
178 !(redir->_ipset = fw3_lookup_ipset(state, redir->ipset.name, false)))
180 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
181 fw3_free_redirect(redir);
185 if (!check_families(e, redir))
187 fw3_free_redirect(redir);
191 if (redir->target == FW3_FLAG_UNSPEC)
193 warn_elem(e, "has no target specified, defaulting to DNAT");
194 redir->target = FW3_FLAG_DNAT;
196 else if (redir->target < FW3_FLAG_DNAT)
198 warn_elem(e, "has invalid target specified, defaulting to DNAT");
199 redir->target = FW3_FLAG_DNAT;
202 if (redir->target == FW3_FLAG_DNAT)
205 warn_elem(e, "must not have source '*' for DNAT target");
206 else if (!redir->_src)
207 warn_elem(e, "has no source specified");
210 set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
211 redir->_src->conntrack = true;
215 if (redir->reflection && redir->_dest && redir->_src->masq)
217 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
218 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
219 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
225 warn_elem(e, "must not have destination '*' for SNAT target");
226 else if (!redir->_dest)
227 warn_elem(e, "has no destination specified");
228 else if (!redir->ip_dest.set)
229 warn_elem(e, "has no src_dip option specified");
230 else if (!list_empty(&redir->mac_src))
231 warn_elem(e, "must not use 'src_mac' option for SNAT target");
234 set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
235 redir->_dest->conntrack = true;
242 fw3_free_redirect(redir);
246 if (!redir->port_redir.set)
247 redir->port_redir = redir->port_dest;
249 list_add_tail(&redir->list, &state->redirects);
254 print_chain_nat(struct fw3_redirect *redir)
256 if (redir->target == FW3_FLAG_DNAT)
257 fw3_pr("-A zone_%s_prerouting", redir->src.name);
259 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
263 print_snat_dnat(enum fw3_flag target,
264 struct fw3_address *addr, struct fw3_port *port)
267 char s[sizeof("255.255.255.255 ")];
269 if (target == FW3_FLAG_DNAT)
270 t = "DNAT --to-destination";
272 t = "SNAT --to-source";
274 inet_ntop(AF_INET, &addr->address.v4, s, sizeof(s));
276 fw3_pr(" -j %s %s", t, s);
278 if (port && port->set)
280 if (port->port_min == port->port_max)
281 fw3_pr(":%u", port->port_min);
283 fw3_pr(":%u-%u", port->port_min, port->port_max);
290 print_target_nat(struct fw3_redirect *redir)
292 if (redir->target == FW3_FLAG_DNAT)
293 print_snat_dnat(redir->target, &redir->ip_redir, &redir->port_redir);
295 print_snat_dnat(redir->target, &redir->ip_dest, &redir->port_dest);
299 print_chain_filter(struct fw3_redirect *redir)
301 if (redir->target == FW3_FLAG_DNAT)
303 /* XXX: check for local ip */
304 if (!redir->ip_redir.set)
305 fw3_pr("-A zone_%s_input", redir->src.name);
307 fw3_pr("-A zone_%s_forward", redir->src.name);
311 if (redir->src.set && !redir->src.any)
312 fw3_pr("-A zone_%s_forward", redir->src.name);
314 fw3_pr("-A delegate_forward");
319 print_target_filter(struct fw3_redirect *redir)
321 /* XXX: check for local ip */
322 if (redir->target == FW3_FLAG_DNAT && !redir->ip_redir.set)
323 fw3_pr(" -m conntrack --ctstate DNAT -j ACCEPT\n");
325 fw3_pr(" -j ACCEPT\n");
329 print_redirect(struct fw3_state *state, enum fw3_family family,
330 enum fw3_table table, struct fw3_redirect *redir, int num)
332 struct list_head *ext_addrs, *int_addrs;
333 struct fw3_address *ext_addr, *int_addr, ref_addr;
334 struct fw3_device *ext_net, *int_net;
335 struct fw3_protocol *proto;
339 info(" * Redirect '%s'", redir->name);
341 info(" * Redirect #%u", num);
343 if (!fw3_is_family(redir->_src, family) ||
344 !fw3_is_family(redir->_dest, family))
346 info(" ! Skipping due to different family of zone");
350 if (!fw3_is_family(&redir->ip_src, family) ||
351 !fw3_is_family(&redir->ip_dest, family) ||
352 !fw3_is_family(&redir->ip_redir, family))
354 info(" ! Skipping due to different family of ip address");
360 if (!fw3_is_family(redir->_ipset, family))
362 info(" ! Skipping due to different family in ipset");
366 set(redir->_ipset->flags, family, family);
369 fw3_foreach(proto, &redir->proto)
370 fw3_foreach(mac, &redir->mac_src)
372 if (table == FW3_TABLE_NAT)
374 print_chain_nat(redir);
375 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
376 fw3_format_protocol(proto, family);
378 if (redir->target == FW3_FLAG_DNAT)
380 fw3_format_src_dest(&redir->ip_src, &redir->ip_dest);
381 fw3_format_sport_dport(&redir->port_src, &redir->port_dest);
385 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
386 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
390 fw3_format_time(&redir->time);
391 fw3_format_extra(redir->extra);
392 fw3_format_comment(redir->name);
393 print_target_nat(redir);
395 else if (table == FW3_TABLE_FILTER)
397 print_chain_filter(redir);
398 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
399 fw3_format_protocol(proto, family);
400 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
401 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
403 fw3_format_time(&redir->time);
404 fw3_format_extra(redir->extra);
405 fw3_format_comment(redir->name);
406 print_target_filter(redir);
410 /* reflection rules */
411 if (redir->target != FW3_FLAG_DNAT || !redir->reflection)
414 if (!redir->_dest || !redir->_src->masq)
417 list_for_each_entry(ext_net, &redir->_src->networks, list)
419 ext_addrs = fw3_ubus_address(ext_net->name);
421 if (!ext_addrs || list_empty(ext_addrs))
424 list_for_each_entry(int_net, &redir->_dest->networks, list)
426 int_addrs = fw3_ubus_address(int_net->name);
428 if (!int_addrs || list_empty(int_addrs))
431 fw3_foreach(ext_addr, ext_addrs)
432 fw3_foreach(int_addr, int_addrs)
433 fw3_foreach(proto, &redir->proto)
435 if (!fw3_is_family(int_addr, family) ||
436 !fw3_is_family(ext_addr, family))
439 if (!proto || (proto->protocol != 6 && proto->protocol != 17))
442 if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
443 ref_addr = *int_addr;
445 ref_addr = *ext_addr;
450 if (table == FW3_TABLE_NAT)
452 fw3_pr("-A zone_%s_prerouting", redir->dest.name);
453 fw3_format_protocol(proto, family);
454 fw3_format_src_dest(int_addr, ext_addr);
455 fw3_format_sport_dport(NULL, &redir->port_dest);
456 fw3_format_time(&redir->time);
457 fw3_format_comment(redir->name, " (reflection)");
458 print_snat_dnat(FW3_FLAG_DNAT,
459 &redir->ip_redir, &redir->port_redir);
461 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
462 fw3_format_protocol(proto, family);
463 fw3_format_src_dest(int_addr, &redir->ip_redir);
464 fw3_format_sport_dport(NULL, &redir->port_redir);
465 fw3_format_time(&redir->time);
466 fw3_format_comment(redir->name, " (reflection)");
467 print_snat_dnat(FW3_FLAG_SNAT, &ref_addr, NULL);
469 else if (table == FW3_TABLE_FILTER)
471 fw3_pr("-A zone_%s_forward", redir->dest.name);
472 fw3_format_protocol(proto, family);
473 fw3_format_src_dest(int_addr, &redir->ip_redir);
474 fw3_format_sport_dport(NULL, &redir->port_redir);
475 fw3_format_time(&redir->time);
476 fw3_format_comment(redir->name, " (reflection)");
477 fw3_pr(" -j zone_%s_dest_ACCEPT\n", redir->dest.name);
481 fw3_ubus_address_free(int_addrs);
484 fw3_ubus_address_free(ext_addrs);
489 fw3_print_redirects(struct fw3_state *state, enum fw3_family family,
490 enum fw3_table table)
493 struct fw3_redirect *redir;
495 if (family == FW3_FAMILY_V6)
498 if (table != FW3_TABLE_FILTER && table != FW3_TABLE_NAT)
501 list_for_each_entry(redir, &state->redirects, list)
502 print_redirect(state, family, table, redir, num++);