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.
23 #define C(f, tbl, tgt, fmt) \
24 { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
26 static const struct fw3_rule_spec zone_chains[] = {
27 C(ANY, FILTER, UNSPEC, "zone_%1$s_input"),
28 C(ANY, FILTER, UNSPEC, "zone_%1$s_output"),
29 C(ANY, FILTER, UNSPEC, "zone_%1$s_forward"),
31 C(ANY, FILTER, SRC_ACCEPT, "zone_%1$s_src_ACCEPT"),
32 C(ANY, FILTER, SRC_REJECT, "zone_%1$s_src_REJECT"),
33 C(ANY, FILTER, SRC_DROP, "zone_%1$s_src_DROP"),
35 C(ANY, FILTER, ACCEPT, "zone_%1$s_dest_ACCEPT"),
36 C(ANY, FILTER, REJECT, "zone_%1$s_dest_REJECT"),
37 C(ANY, FILTER, DROP, "zone_%1$s_dest_DROP"),
39 C(V4, NAT, SNAT, "zone_%1$s_postrouting"),
40 C(V4, NAT, DNAT, "zone_%1$s_prerouting"),
42 C(ANY, FILTER, CUSTOM_CHAINS, "input_%1$s_rule"),
43 C(ANY, FILTER, CUSTOM_CHAINS, "output_%1$s_rule"),
44 C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%1$s_rule"),
46 C(V4, NAT, CUSTOM_CHAINS, "prerouting_%1$s_rule"),
47 C(V4, NAT, CUSTOM_CHAINS, "postrouting_%1$s_rule"),
53 #define R(dir1, dir2) \
54 "zone_%1$s_" #dir1 " -m comment --comment \"user chain for %1$s " \
55 #dir2 "\" -j " #dir2 "_%1$s_rule"
57 static const struct fw3_rule_spec zone_rules[] = {
58 C(ANY, FILTER, CUSTOM_CHAINS, R(input, input)),
59 C(ANY, FILTER, CUSTOM_CHAINS, R(output, output)),
60 C(ANY, FILTER, CUSTOM_CHAINS, R(forward, forwarding)),
62 C(V4, NAT, CUSTOM_CHAINS, R(prerouting, prerouting)),
63 C(V4, NAT, CUSTOM_CHAINS, R(postrouting, postrouting)),
68 const struct fw3_option fw3_zone_opts[] = {
69 FW3_OPT("enabled", bool, zone, enabled),
71 FW3_OPT("name", string, zone, name),
72 FW3_OPT("family", family, zone, family),
74 FW3_LIST("network", device, zone, networks),
75 FW3_LIST("device", device, zone, devices),
76 FW3_LIST("subnet", network, zone, subnets),
78 FW3_OPT("input", target, zone, policy_input),
79 FW3_OPT("forward", target, zone, policy_forward),
80 FW3_OPT("output", target, zone, policy_output),
82 FW3_OPT("masq", bool, zone, masq),
83 FW3_LIST("masq_src", network, zone, masq_src),
84 FW3_LIST("masq_dest", network, zone, masq_dest),
86 FW3_OPT("extra", string, zone, extra_src),
87 FW3_OPT("extra_src", string, zone, extra_src),
88 FW3_OPT("extra_dest", string, zone, extra_dest),
90 FW3_OPT("conntrack", bool, zone, conntrack),
91 FW3_OPT("mtu_fix", bool, zone, mtu_fix),
92 FW3_OPT("custom_chains", bool, zone, custom_chains),
94 FW3_OPT("log", bool, zone, log),
95 FW3_OPT("log_limit", limit, zone, log_limit),
97 FW3_OPT("__flags_v4", int, zone, flags[0]),
98 FW3_OPT("__flags_v6", int, zone, flags[1]),
105 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
108 if (*pol == FW3_FLAG_UNSPEC)
110 warn_elem(e, "has no %s policy specified, using default", name);
113 else if (*pol > FW3_FLAG_DROP)
115 warn_elem(e, "has invalid %s policy, using default", name);
121 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
123 struct fw3_device *net, *tmp;
125 list_for_each_entry(net, &zone->networks, list)
127 tmp = fw3_ubus_device(net->name);
131 warn_elem(e, "cannot resolve device of network '%s'", net->name);
136 list_add_tail(&tmp->list, &zone->devices);
143 struct fw3_zone *zone;
145 zone = malloc(sizeof(*zone));
150 memset(zone, 0, sizeof(*zone));
152 INIT_LIST_HEAD(&zone->networks);
153 INIT_LIST_HEAD(&zone->devices);
154 INIT_LIST_HEAD(&zone->subnets);
155 INIT_LIST_HEAD(&zone->masq_src);
156 INIT_LIST_HEAD(&zone->masq_dest);
158 zone->enabled = true;
159 zone->custom_chains = true;
160 zone->log_limit.rate = 10;
166 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
168 struct uci_section *s;
169 struct uci_element *e;
170 struct fw3_zone *zone;
171 struct fw3_defaults *defs = &state->defaults;
173 INIT_LIST_HEAD(&state->zones);
175 uci_foreach_element(&p->sections, e)
177 s = uci_to_section(e);
179 if (strcmp(s->type, "zone"))
182 zone = fw3_alloc_zone();
187 fw3_parse_options(zone, fw3_zone_opts, s);
195 if (!zone->extra_dest)
196 zone->extra_dest = zone->extra_src;
198 if (!defs->custom_chains && zone->custom_chains)
199 zone->custom_chains = false;
201 if (!zone->name || !*zone->name)
203 warn_elem(e, "has no name - ignoring");
208 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
209 list_empty(&zone->subnets) && !zone->extra_src)
211 warn_elem(e, "has no device, network, subnet or extra options");
214 check_policy(e, &zone->policy_input, defs->policy_input, "input");
215 check_policy(e, &zone->policy_output, defs->policy_output, "output");
216 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
218 resolve_networks(e, zone);
222 setbit(zone->flags[0], FW3_FLAG_SNAT);
223 zone->conntrack = true;
226 if (zone->custom_chains)
228 setbit(zone->flags[0], FW3_FLAG_SNAT);
229 setbit(zone->flags[0], FW3_FLAG_DNAT);
232 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
233 setbit(zone->flags[0], zone->policy_output);
234 setbit(zone->flags[0], zone->policy_forward);
236 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
237 setbit(zone->flags[1], zone->policy_output);
238 setbit(zone->flags[1], zone->policy_forward);
240 list_add_tail(&zone->list, &state->zones);
246 print_zone_chain(struct fw3_state *state, enum fw3_family family,
247 enum fw3_table table, bool reload, struct fw3_zone *zone)
250 uint32_t custom_mask = ~0;
252 if (!fw3_is_family(zone, family))
255 set(zone->flags, family, table);
257 /* Don't touch user chains on reload */
259 delbit(custom_mask, FW3_FLAG_CUSTOM_CHAINS);
261 if (zone->custom_chains)
262 set(zone->flags, family, FW3_FLAG_CUSTOM_CHAINS);
264 if (!zone->conntrack && !state->defaults.drop_invalid)
265 set(zone->flags, family, FW3_FLAG_NOTRACK);
267 c = fw3_pr_rulespec(table, family, zone->flags, custom_mask, zone_chains,
268 ":%s - [0:0]\n", zone->name);
270 r = fw3_pr_rulespec(table, family, zone->flags, 0, zone_rules,
271 "-A %s\n", zone->name);
275 info(" * Zone '%s'", zone->name);
277 set(zone->flags, family, table);
282 print_interface_rule(struct fw3_state *state, enum fw3_family family,
283 enum fw3_table table, bool reload, struct fw3_zone *zone,
284 struct fw3_device *dev, struct fw3_address *sub)
286 bool disable_notrack = state->defaults.drop_invalid;
290 #define jump_target(t) \
291 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
293 if (table == FW3_TABLE_FILTER)
295 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
297 if (has(zone->flags, family, fw3_to_src_target(t)))
299 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
300 fw3_format_in_out(dev, NULL);
301 fw3_format_src_dest(sub, NULL);
302 fw3_format_extra(zone->extra_src);
303 fw3_pr(" -j %s\n", jump_target(t));
306 if (has(zone->flags, family, t))
308 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
309 fw3_format_in_out(NULL, dev);
310 fw3_format_src_dest(NULL, sub);
311 fw3_format_extra(zone->extra_dest);
312 fw3_pr(" -j %s\n", jump_target(t));
316 fw3_pr("-A delegate_input");
317 fw3_format_in_out(dev, NULL);
318 fw3_format_src_dest(sub, NULL);
319 fw3_format_extra(zone->extra_src);
320 fw3_pr(" -j zone_%s_input\n", zone->name);
322 fw3_pr("-A delegate_forward");
323 fw3_format_in_out(dev, NULL);
324 fw3_format_src_dest(sub, NULL);
325 fw3_format_extra(zone->extra_src);
326 fw3_pr(" -j zone_%s_forward\n", zone->name);
328 fw3_pr("-A delegate_output");
329 fw3_format_in_out(NULL, dev);
330 fw3_format_src_dest(NULL, sub);
331 fw3_format_extra(zone->extra_dest);
332 fw3_pr(" -j zone_%s_output\n", zone->name);
334 else if (table == FW3_TABLE_NAT)
336 if (has(zone->flags, family, FW3_FLAG_DNAT))
338 fw3_pr("-A delegate_prerouting");
339 fw3_format_in_out(dev, NULL);
340 fw3_format_src_dest(sub, NULL);
341 fw3_format_extra(zone->extra_src);
342 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
345 if (has(zone->flags, family, FW3_FLAG_SNAT))
347 fw3_pr("-A delegate_postrouting");
348 fw3_format_in_out(NULL, dev);
349 fw3_format_src_dest(NULL, sub);
350 fw3_format_extra(zone->extra_dest);
351 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
354 else if (table == FW3_TABLE_MANGLE)
361 fw3_format_in_out(NULL, dev);
362 fw3_format_src_dest(NULL, sub);
363 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
364 fw3_format_limit(&zone->log_limit);
365 fw3_format_comment(zone->name, " (mtu_fix logging)");
366 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
370 fw3_format_in_out(NULL, dev);
371 fw3_format_src_dest(NULL, sub);
372 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
373 fw3_format_comment(zone->name, " (mtu_fix)");
374 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
377 else if (table == FW3_TABLE_RAW)
379 if (!zone->conntrack && !disable_notrack)
381 fw3_pr("-A notrack");
382 fw3_format_in_out(dev, NULL);
383 fw3_format_src_dest(sub, NULL);
384 fw3_format_extra(zone->extra_src);
385 fw3_format_comment(zone->name, " (notrack)");
386 fw3_pr(" -j CT --notrack\n", zone->name);
392 print_interface_rules(struct fw3_state *state, enum fw3_family family,
393 enum fw3_table table, bool reload, struct fw3_zone *zone)
395 struct fw3_device *dev;
396 struct fw3_address *sub;
398 fw3_foreach(dev, &zone->devices)
399 fw3_foreach(sub, &zone->subnets)
401 if (!fw3_is_family(sub, family))
407 print_interface_rule(state, family, table, reload, zone, dev, sub);
412 print_zone_rule(struct fw3_state *state, enum fw3_family family,
413 enum fw3_table table, bool reload, struct fw3_zone *zone)
415 struct fw3_address *msrc;
416 struct fw3_address *mdest;
420 if (!fw3_is_family(zone, family))
425 case FW3_TABLE_FILTER:
426 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
427 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
429 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
430 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
432 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
433 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
437 for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
439 if (has(zone->flags, family, fw3_to_src_target(t)))
441 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
442 fw3_format_limit(&zone->log_limit);
443 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
444 fw3_flag_names[t], zone->name);
447 if (has(zone->flags, family, t))
449 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
450 fw3_format_limit(&zone->log_limit);
451 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
452 fw3_flag_names[t], zone->name);
459 if (zone->masq && family == FW3_FAMILY_V4)
461 fw3_foreach(msrc, &zone->masq_src)
462 fw3_foreach(mdest, &zone->masq_dest)
464 if (!fw3_is_family(msrc, family) ||
465 !fw3_is_family(mdest, family))
468 fw3_pr("-A zone_%s_postrouting", zone->name);
469 fw3_format_src_dest(msrc, mdest);
470 fw3_pr(" -j MASQUERADE\n");
476 case FW3_TABLE_MANGLE:
480 print_interface_rules(state, family, table, reload, zone);
484 fw3_print_zone_chains(struct fw3_state *state, enum fw3_family family,
485 enum fw3_table table, bool reload)
487 struct fw3_zone *zone;
489 list_for_each_entry(zone, &state->zones, list)
490 if (!hasbit(zone->flags[0], FW3_FLAG_DELETED))
491 print_zone_chain(state, family, table, reload, zone);
495 fw3_print_zone_rules(struct fw3_state *state, enum fw3_family family,
496 enum fw3_table table, bool reload)
498 struct fw3_zone *zone;
500 list_for_each_entry(zone, &state->zones, list)
501 if (!hasbit(zone->flags[0], FW3_FLAG_DELETED))
502 print_zone_rule(state, family, table, reload, zone);
506 fw3_flush_zones(struct fw3_state *state, enum fw3_family family,
507 enum fw3_table table, bool reload, bool pass2)
509 struct fw3_zone *z, *tmp;
510 uint32_t custom_mask = ~0;
512 /* don't touch user chains on selective stop */
514 delbit(custom_mask, FW3_FLAG_CUSTOM_CHAINS);
516 list_for_each_entry_safe(z, tmp, &state->zones, list)
518 if (!has(z->flags, family, table))
521 fw3_pr_rulespec(table, family, z->flags, custom_mask, zone_chains,
522 pass2 ? "-X %s\n" : "-F %s\n", z->name);
525 del(z->flags, family, table);
530 fw3_hotplug_zones(struct fw3_state *state, bool add)
533 struct fw3_device *d;
537 list_for_each_entry(z, &state->zones, list)
539 if (!hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
541 list_for_each_entry(d, &z->devices, list)
542 fw3_hotplug(add, z, d);
544 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
550 list_for_each_entry(z, &state->zones, list)
552 if (hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
554 list_for_each_entry(d, &z->devices, list)
555 fw3_hotplug(add, z, d);
557 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
564 fw3_lookup_zone(struct fw3_state *state, const char *name)
568 if (list_empty(&state->zones))
571 list_for_each_entry(z, &state->zones, list)
573 if (strcmp(z->name, name))
583 fw3_free_zone(struct fw3_zone *zone)
585 struct fw3_device *dev, *tmp;
587 list_for_each_entry_safe(dev, tmp, &zone->devices, list)
589 list_del(&dev->list);
593 list_for_each_entry_safe(dev, tmp, &zone->networks, list)
595 list_del(&dev->list);
599 fw3_free_object(zone, fw3_zone_opts);