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("name", string, redirect, name),
24 FW3_OPT("family", family, redirect, family),
26 FW3_OPT("src", device, redirect, src),
27 FW3_OPT("dest", device, redirect, dest),
29 FW3_OPT("ipset", device, redirect, ipset),
31 FW3_LIST("proto", protocol, redirect, proto),
33 FW3_OPT("src_ip", address, redirect, ip_src),
34 FW3_LIST("src_mac", mac, redirect, mac_src),
35 FW3_OPT("src_port", port, redirect, port_src),
37 FW3_OPT("src_dip", address, redirect, ip_dest),
38 FW3_OPT("src_dport", port, redirect, port_dest),
40 FW3_OPT("dest_ip", address, redirect, ip_redir),
41 FW3_OPT("dest_port", port, redirect, port_redir),
43 FW3_OPT("extra", string, redirect, extra),
45 FW3_OPT("utc_time", bool, redirect, time.utc),
46 FW3_OPT("start_date", date, redirect, time.datestart),
47 FW3_OPT("stop_date", date, redirect, time.datestop),
48 FW3_OPT("start_time", time, redirect, time.timestart),
49 FW3_OPT("stop_time", time, redirect, time.timestop),
50 FW3_OPT("weekdays", weekdays, redirect, time.weekdays),
51 FW3_OPT("monthdays", monthdays, redirect, time.monthdays),
53 FW3_OPT("reflection", bool, redirect, reflection),
55 FW3_OPT("target", target, redirect, target),
62 check_families(struct uci_element *e, struct fw3_redirect *r)
64 if (r->family == FW3_FAMILY_ANY)
67 if (r->_src && r->_src->family && r->_src->family != r->family)
69 warn_elem(e, "refers to source zone with different family");
73 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
75 warn_elem(e, "refers to destination zone with different family");
79 if (r->_ipset && r->_ipset->family && r->_ipset->family != r->family)
81 warn_elem(e, "refers to ipset with different family");
85 if (r->ip_src.family && r->ip_src.family != r->family)
87 warn_elem(e, "uses source ip with different family");
91 if (r->ip_dest.family && r->ip_dest.family != r->family)
93 warn_elem(e, "uses destination ip with different family");
97 if (r->ip_redir.family && r->ip_redir.family != r->family)
99 warn_elem(e, "uses redirect ip with different family");
107 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
109 struct uci_section *s;
110 struct uci_element *e;
111 struct fw3_redirect *redir;
115 INIT_LIST_HEAD(&state->redirects);
117 uci_foreach_element(&p->sections, e)
119 s = uci_to_section(e);
121 if (strcmp(s->type, "redirect"))
124 redir = malloc(sizeof(*redir));
129 memset(redir, 0, sizeof(*redir));
131 INIT_LIST_HEAD(&redir->proto);
132 INIT_LIST_HEAD(&redir->mac_src);
134 redir->reflection = true;
136 fw3_parse_options(redir, fw3_redirect_opts, s);
138 if (redir->src.invert)
140 warn_elem(e, "must not have an inverted source");
141 fw3_free_redirect(redir);
144 else if (redir->src.set && !redir->src.any &&
145 !(redir->_src = fw3_lookup_zone(state, redir->src.name, false)))
147 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
148 fw3_free_redirect(redir);
151 else if (redir->dest.set && !redir->dest.any &&
152 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name, false)))
154 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
155 fw3_free_redirect(redir);
158 else if (redir->ipset.set && state->disable_ipsets)
160 warn_elem(e, "skipped due to disabled ipset support");
161 fw3_free_redirect(redir);
164 else if (redir->ipset.set && !redir->ipset.any &&
165 !(redir->_ipset = fw3_lookup_ipset(state, redir->ipset.name, false)))
167 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
168 fw3_free_redirect(redir);
172 if (!check_families(e, redir))
174 fw3_free_redirect(redir);
178 if (redir->target == FW3_TARGET_UNSPEC)
180 warn_elem(e, "has no target specified, defaulting to DNAT");
181 redir->target = FW3_TARGET_DNAT;
183 else if (redir->target < FW3_TARGET_DNAT)
185 warn_elem(e, "has invalid target specified, defaulting to DNAT");
186 redir->target = FW3_TARGET_DNAT;
189 if (redir->target == FW3_TARGET_DNAT)
192 warn_elem(e, "must not have source '*' for DNAT target");
193 else if (!redir->_src)
194 warn_elem(e, "has no source specified");
197 setbit(redir->_src->dst_flags, redir->target);
198 redir->_src->conntrack = true;
202 if (redir->reflection && redir->_dest && redir->_src->masq)
204 setbit(redir->_dest->dst_flags, FW3_TARGET_ACCEPT);
205 setbit(redir->_dest->dst_flags, FW3_TARGET_DNAT);
206 setbit(redir->_dest->dst_flags, FW3_TARGET_SNAT);
212 warn_elem(e, "must not have destination '*' for SNAT target");
213 else if (!redir->_dest)
214 warn_elem(e, "has no destination specified");
215 else if (!redir->ip_dest.set)
216 warn_elem(e, "has no src_dip option specified");
219 setbit(redir->_dest->dst_flags, redir->target);
220 redir->_dest->conntrack = true;
227 fw3_free_redirect(redir);
231 if (!redir->port_redir.set)
232 redir->port_redir = redir->port_dest;
234 list_add_tail(&redir->list, &state->redirects);
239 print_chain_nat(struct fw3_redirect *redir)
241 if (redir->target == FW3_TARGET_DNAT)
242 fw3_pr("-A zone_%s_prerouting", redir->src.name);
244 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
248 print_snat_dnat(enum fw3_target target,
249 struct fw3_address *addr, struct fw3_port *port)
252 char s[sizeof("255.255.255.255 ")];
254 if (target == FW3_TARGET_DNAT)
255 t = "DNAT --to-destination";
257 t = "SNAT --to-source";
259 inet_ntop(AF_INET, &addr->address.v4, s, sizeof(s));
261 fw3_pr(" -j %s %s", t, s);
263 if (port && port->set)
265 if (port->port_min == port->port_max)
266 fw3_pr(":%u", port->port_min);
268 fw3_pr(":%u-%u", port->port_min, port->port_max);
275 print_target_nat(struct fw3_redirect *redir)
277 if (redir->target == FW3_TARGET_DNAT)
278 print_snat_dnat(redir->target, &redir->ip_redir, &redir->port_redir);
280 print_snat_dnat(redir->target, &redir->ip_dest, &redir->port_dest);
284 print_chain_filter(struct fw3_redirect *redir)
286 if (redir->target == FW3_TARGET_DNAT)
288 /* XXX: check for local ip */
289 if (!redir->ip_redir.set)
290 fw3_pr("-A zone_%s_input", redir->src.name);
292 fw3_pr("-A zone_%s_forward", redir->src.name);
296 if (redir->src.set && !redir->src.any)
297 fw3_pr("-A zone_%s_forward", redir->src.name);
299 fw3_pr("-A delegate_forward");
304 print_target_filter(struct fw3_redirect *redir)
306 /* XXX: check for local ip */
307 if (redir->target == FW3_TARGET_DNAT && !redir->ip_redir.set)
308 fw3_pr(" -m conntrack --ctstate DNAT -j ACCEPT\n");
310 fw3_pr(" -j ACCEPT\n");
314 print_redirect(enum fw3_table table, enum fw3_family family,
315 struct fw3_redirect *redir, int num)
317 struct list_head *ext_addrs, *int_addrs;
318 struct fw3_address *ext_addr, *int_addr;
319 struct fw3_device *ext_net, *int_net;
320 struct fw3_protocol *proto;
324 info(" * Redirect '%s'", redir->name);
326 info(" * Redirect #%u", num);
328 if (!fw3_is_family(redir->_src, family) ||
329 !fw3_is_family(redir->_dest, family))
331 info(" ! Skipping due to different family of zone");
335 if (!fw3_is_family(&redir->ip_src, family) ||
336 !fw3_is_family(&redir->ip_dest, family) ||
337 !fw3_is_family(&redir->ip_redir, family))
339 info(" ! Skipping due to different family of ip address");
345 if (!fw3_is_family(redir->_ipset, family))
347 info(" ! Skipping due to different family in ipset");
351 setbit(redir->_ipset->flags, family);
354 fw3_foreach(proto, &redir->proto)
355 fw3_foreach(mac, &redir->mac_src)
357 if (table == FW3_TABLE_NAT)
359 print_chain_nat(redir);
360 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
361 fw3_format_protocol(proto, family);
363 if (redir->target == FW3_TARGET_DNAT)
365 fw3_format_src_dest(&redir->ip_src, &redir->ip_dest);
366 fw3_format_sport_dport(&redir->port_src, &redir->port_dest);
370 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
371 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
375 fw3_format_time(&redir->time);
376 fw3_format_extra(redir->extra);
377 fw3_format_comment(redir->name);
378 print_target_nat(redir);
380 else if (table == FW3_TABLE_FILTER)
382 print_chain_filter(redir);
383 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
384 fw3_format_protocol(proto, family);
385 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
386 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
388 fw3_format_time(&redir->time);
389 fw3_format_extra(redir->extra);
390 fw3_format_comment(redir->name);
391 print_target_filter(redir);
395 /* reflection rules */
396 if (redir->target != FW3_TARGET_DNAT || !redir->reflection)
399 if (!redir->_dest || !redir->_src->masq)
402 list_for_each_entry(ext_net, &redir->_src->networks, list)
404 ext_addrs = fw3_ubus_address(ext_net->name);
406 if (!ext_addrs || list_empty(ext_addrs))
409 list_for_each_entry(int_net, &redir->_dest->networks, list)
411 int_addrs = fw3_ubus_address(int_net->name);
413 if (!int_addrs || list_empty(int_addrs))
416 fw3_foreach(ext_addr, ext_addrs)
417 fw3_foreach(int_addr, int_addrs)
418 fw3_foreach(proto, &redir->proto)
420 if (!fw3_is_family(int_addr, family) ||
421 !fw3_is_family(ext_addr, family))
424 if (!proto || (proto->protocol != 6 && proto->protocol != 17))
429 if (table == FW3_TABLE_NAT)
431 fw3_pr("-A zone_%s_prerouting", redir->dest.name);
432 fw3_format_protocol(proto, family);
433 fw3_format_src_dest(int_addr, ext_addr);
434 fw3_format_sport_dport(NULL, &redir->port_dest);
435 fw3_format_time(&redir->time);
436 fw3_format_comment(redir->name, " (reflection)");
437 print_snat_dnat(FW3_TARGET_DNAT,
438 &redir->ip_redir, &redir->port_redir);
440 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
441 fw3_format_protocol(proto, family);
442 fw3_format_src_dest(int_addr, &redir->ip_redir);
443 fw3_format_sport_dport(NULL, &redir->port_redir);
444 fw3_format_time(&redir->time);
445 fw3_format_comment(redir->name, " (reflection)");
446 print_snat_dnat(FW3_TARGET_SNAT, ext_addr, NULL);
448 else if (table == FW3_TABLE_FILTER)
450 fw3_pr("-A zone_%s_forward", redir->dest.name);
451 fw3_format_protocol(proto, family);
452 fw3_format_src_dest(int_addr, &redir->ip_redir);
453 fw3_format_sport_dport(NULL, &redir->port_redir);
454 fw3_format_time(&redir->time);
455 fw3_format_comment(redir->name, " (reflection)");
456 fw3_pr(" -j zone_%s_dest_ACCEPT\n", redir->dest.name);
460 fw3_ubus_address_free(int_addrs);
463 fw3_ubus_address_free(ext_addrs);
468 fw3_print_redirects(enum fw3_table table, enum fw3_family family,
469 struct fw3_state *state)
472 struct fw3_redirect *redir;
474 if (family == FW3_FAMILY_V6)
477 if (table != FW3_TABLE_FILTER && table != FW3_TABLE_NAT)
480 list_for_each_entry(redir, &state->redirects, list)
481 print_redirect(table, family, redir, num++);