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("reflection", bool, redirect, reflection),
47 FW3_OPT("target", target, redirect, target),
54 check_families(struct uci_element *e, struct fw3_redirect *r)
56 if (r->family == FW3_FAMILY_ANY)
59 if (r->_src && r->_src->family && r->_src->family != r->family)
61 warn_elem(e, "refers to source zone with different family");
65 if (r->_dest && r->_dest->family && r->_dest->family != r->family)
67 warn_elem(e, "refers to destination zone with different family");
71 if (r->_ipset && r->_ipset->family && r->_ipset->family != r->family)
73 warn_elem(e, "refers to ipset with different family");
77 if (r->ip_src.family && r->ip_src.family != r->family)
79 warn_elem(e, "uses source ip with different family");
83 if (r->ip_dest.family && r->ip_dest.family != r->family)
85 warn_elem(e, "uses destination ip with different family");
89 if (r->ip_redir.family && r->ip_redir.family != r->family)
91 warn_elem(e, "uses redirect ip with different family");
99 fw3_load_redirects(struct fw3_state *state, struct uci_package *p)
101 struct uci_section *s;
102 struct uci_element *e;
103 struct fw3_redirect *redir;
107 INIT_LIST_HEAD(&state->redirects);
109 uci_foreach_element(&p->sections, e)
111 s = uci_to_section(e);
113 if (strcmp(s->type, "redirect"))
116 redir = malloc(sizeof(*redir));
121 memset(redir, 0, sizeof(*redir));
123 INIT_LIST_HEAD(&redir->proto);
124 INIT_LIST_HEAD(&redir->mac_src);
126 redir->reflection = true;
128 fw3_parse_options(redir, fw3_redirect_opts, s);
130 if (redir->src.invert)
132 warn_elem(e, "must not have an inverted source");
133 fw3_free_redirect(redir);
136 else if (redir->src.set && !redir->src.any &&
137 !(redir->_src = fw3_lookup_zone(state, redir->src.name, false)))
139 warn_elem(e, "refers to not existing zone '%s'", redir->src.name);
140 fw3_free_redirect(redir);
143 else if (redir->dest.set && !redir->dest.any &&
144 !(redir->_dest = fw3_lookup_zone(state, redir->dest.name, false)))
146 warn_elem(e, "refers to not existing zone '%s'", redir->dest.name);
147 fw3_free_redirect(redir);
150 else if (redir->ipset.set && state->disable_ipsets)
152 warn_elem(e, "skipped due to disabled ipset support");
153 fw3_free_redirect(redir);
156 else if (redir->ipset.set && !redir->ipset.any &&
157 !(redir->_ipset = fw3_lookup_ipset(state, redir->ipset.name, false)))
159 warn_elem(e, "refers to unknown ipset '%s'", redir->ipset.name);
160 fw3_free_redirect(redir);
164 if (!check_families(e, redir))
166 fw3_free_redirect(redir);
170 if (redir->target == FW3_TARGET_UNSPEC)
172 warn_elem(e, "has no target specified, defaulting to DNAT");
173 redir->target = FW3_TARGET_DNAT;
175 else if (redir->target < FW3_TARGET_DNAT)
177 warn_elem(e, "has invalid target specified, defaulting to DNAT");
178 redir->target = FW3_TARGET_DNAT;
181 if (redir->target == FW3_TARGET_DNAT)
184 warn_elem(e, "must not have source '*' for DNAT target");
185 else if (!redir->_src)
186 warn_elem(e, "has no source specified");
189 setbit(redir->_src->dst_flags, redir->target);
190 redir->_src->conntrack = true;
194 if (redir->reflection && redir->_dest && redir->_src->masq)
196 setbit(redir->_dest->dst_flags, FW3_TARGET_ACCEPT);
197 setbit(redir->_dest->dst_flags, FW3_TARGET_DNAT);
198 setbit(redir->_dest->dst_flags, FW3_TARGET_SNAT);
204 warn_elem(e, "must not have destination '*' for SNAT target");
205 else if (!redir->_dest)
206 warn_elem(e, "has no destination specified");
207 else if (!redir->ip_dest.set)
208 warn_elem(e, "has no src_dip option specified");
211 setbit(redir->_dest->dst_flags, redir->target);
212 redir->_dest->conntrack = true;
219 fw3_free_redirect(redir);
223 if (!redir->port_redir.set)
224 redir->port_redir = redir->port_dest;
226 list_add_tail(&redir->list, &state->redirects);
231 print_chain_nat(struct fw3_redirect *redir)
233 if (redir->target == FW3_TARGET_DNAT)
234 fw3_pr("-A zone_%s_prerouting", redir->src.name);
236 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
240 print_snat_dnat(enum fw3_target target,
241 struct fw3_address *addr, struct fw3_port *port)
244 char s[sizeof("255.255.255.255 ")];
246 if (target == FW3_TARGET_DNAT)
247 t = "DNAT --to-destination";
249 t = "SNAT --to-source";
251 inet_ntop(AF_INET, &addr->address.v4, s, sizeof(s));
253 fw3_pr(" -j %s %s", t, s);
255 if (port && port->set)
257 if (port->port_min == port->port_max)
258 fw3_pr(":%u", port->port_min);
260 fw3_pr(":%u-%u", port->port_min, port->port_max);
267 print_target_nat(struct fw3_redirect *redir)
269 if (redir->target == FW3_TARGET_DNAT)
270 print_snat_dnat(redir->target, &redir->ip_redir, &redir->port_redir);
272 print_snat_dnat(redir->target, &redir->ip_dest, &redir->port_dest);
276 print_chain_filter(struct fw3_redirect *redir)
278 if (redir->target == FW3_TARGET_DNAT)
280 /* XXX: check for local ip */
281 if (!redir->ip_redir.set)
282 fw3_pr("-A zone_%s_input", redir->src.name);
284 fw3_pr("-A zone_%s_forward", redir->src.name);
288 if (redir->src.set && !redir->src.any)
289 fw3_pr("-A zone_%s_forward", redir->src.name);
291 fw3_pr("-A delegate_forward");
296 print_target_filter(struct fw3_redirect *redir)
298 /* XXX: check for local ip */
299 if (redir->target == FW3_TARGET_DNAT && !redir->ip_redir.set)
300 fw3_pr(" -m conntrack --ctstate DNAT -j ACCEPT\n");
302 fw3_pr(" -j ACCEPT\n");
306 print_redirect(enum fw3_table table, enum fw3_family family,
307 struct fw3_redirect *redir, int num)
309 struct list_head *ext_addrs, *int_addrs;
310 struct fw3_address *ext_addr, *int_addr;
311 struct fw3_device *ext_net, *int_net;
312 struct fw3_protocol *proto;
316 info(" * Redirect '%s'", redir->name);
318 info(" * Redirect #%u", num);
320 if (!fw3_is_family(redir->_src, family) ||
321 !fw3_is_family(redir->_dest, family))
323 info(" ! Skipping due to different family of zone");
327 if (!fw3_is_family(&redir->ip_src, family) ||
328 !fw3_is_family(&redir->ip_dest, family) ||
329 !fw3_is_family(&redir->ip_redir, family))
331 info(" ! Skipping due to different family of ip address");
337 if (!fw3_is_family(redir->_ipset, family))
339 info(" ! Skipping due to different family in ipset");
343 setbit(redir->_ipset->flags, family);
346 fw3_foreach(proto, &redir->proto)
347 fw3_foreach(mac, &redir->mac_src)
349 if (table == FW3_TABLE_NAT)
351 print_chain_nat(redir);
352 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
353 fw3_format_protocol(proto, family);
355 if (redir->target == FW3_TARGET_DNAT)
357 fw3_format_src_dest(&redir->ip_src, &redir->ip_dest);
358 fw3_format_sport_dport(&redir->port_src, &redir->port_dest);
362 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
363 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
367 fw3_format_extra(redir->extra);
368 fw3_format_comment(redir->name);
369 print_target_nat(redir);
371 else if (table == FW3_TABLE_FILTER)
373 print_chain_filter(redir);
374 fw3_format_ipset(redir->_ipset, redir->ipset.invert);
375 fw3_format_protocol(proto, family);
376 fw3_format_src_dest(&redir->ip_src, &redir->ip_redir);
377 fw3_format_sport_dport(&redir->port_src, &redir->port_redir);
379 fw3_format_extra(redir->extra);
380 fw3_format_comment(redir->name);
381 print_target_filter(redir);
385 /* reflection rules */
386 if (redir->target != FW3_TARGET_DNAT || !redir->reflection)
389 if (!redir->_dest || !redir->_src->masq)
392 list_for_each_entry(ext_net, &redir->_src->networks, list)
394 ext_addrs = fw3_ubus_address(ext_net->name);
396 if (!ext_addrs || list_empty(ext_addrs))
399 list_for_each_entry(int_net, &redir->_dest->networks, list)
401 int_addrs = fw3_ubus_address(int_net->name);
403 if (!int_addrs || list_empty(int_addrs))
406 fw3_foreach(ext_addr, ext_addrs)
407 fw3_foreach(int_addr, int_addrs)
408 fw3_foreach(proto, &redir->proto)
410 if (!fw3_is_family(int_addr, family) ||
411 !fw3_is_family(ext_addr, family))
414 if (!proto || (proto->protocol != 6 && proto->protocol != 17))
419 if (table == FW3_TABLE_NAT)
421 fw3_pr("-A zone_%s_prerouting", redir->dest.name);
422 fw3_format_protocol(proto, family);
423 fw3_format_src_dest(int_addr, ext_addr);
424 fw3_format_sport_dport(NULL, &redir->port_dest);
425 fw3_format_comment(redir->name, " (reflection)");
426 print_snat_dnat(FW3_TARGET_DNAT,
427 &redir->ip_redir, &redir->port_redir);
429 fw3_pr("-A zone_%s_postrouting", redir->dest.name);
430 fw3_format_protocol(proto, family);
431 fw3_format_src_dest(int_addr, &redir->ip_redir);
432 fw3_format_sport_dport(NULL, &redir->port_redir);
433 fw3_format_comment(redir->name, " (reflection)");
434 print_snat_dnat(FW3_TARGET_SNAT, ext_addr, NULL);
436 else if (table == FW3_TABLE_FILTER)
438 fw3_pr("-A zone_%s_forward", redir->dest.name);
439 fw3_format_protocol(proto, family);
440 fw3_format_src_dest(int_addr, &redir->ip_redir);
441 fw3_format_sport_dport(NULL, &redir->port_redir);
442 fw3_format_comment(redir->name, " (reflection)");
443 fw3_pr(" -j zone_%s_dest_ACCEPT\n", redir->dest.name);
447 fw3_ubus_address_free(int_addrs);
450 fw3_ubus_address_free(ext_addrs);
455 fw3_print_redirects(enum fw3_table table, enum fw3_family family,
456 struct fw3_state *state)
459 struct fw3_redirect *redir;
461 if (family == FW3_FAMILY_V6)
464 if (table != FW3_TABLE_FILTER && table != FW3_TABLE_NAT)
467 list_for_each_entry(redir, &state->redirects, list)
468 print_redirect(table, family, redir, num++);