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", address, 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", address, zone, masq_src),
84 FW3_LIST("masq_dest", address, 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),
102 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
105 if (*pol == FW3_FLAG_UNSPEC)
107 warn_elem(e, "has no %s policy specified, using default", name);
110 else if (*pol > FW3_FLAG_DROP)
112 warn_elem(e, "has invalid %s policy, using default", name);
118 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
120 struct fw3_device *net, *tmp;
122 list_for_each_entry(net, &zone->networks, list)
124 tmp = fw3_ubus_device(net->name);
128 warn_elem(e, "cannot resolve device of network '%s'", net->name);
133 list_add_tail(&tmp->list, &zone->devices);
140 struct fw3_zone *zone;
142 zone = malloc(sizeof(*zone));
147 memset(zone, 0, sizeof(*zone));
149 INIT_LIST_HEAD(&zone->networks);
150 INIT_LIST_HEAD(&zone->devices);
151 INIT_LIST_HEAD(&zone->subnets);
152 INIT_LIST_HEAD(&zone->masq_src);
153 INIT_LIST_HEAD(&zone->masq_dest);
155 INIT_LIST_HEAD(&zone->running_networks);
156 INIT_LIST_HEAD(&zone->running_devices);
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(enum fw3_table table, enum fw3_family family,
247 struct fw3_zone *zone, bool reload, struct fw3_state *state)
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);
276 fw3_set_running(zone, &state->running_zones);
278 set(zone->flags, family, table);
283 print_interface_rule(enum fw3_table table, enum fw3_family family,
284 struct fw3_zone *zone, struct fw3_device *dev,
285 struct fw3_address *sub, bool reload, bool disable_notrack)
289 #define jump_target(t) \
290 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
292 if (table == FW3_TABLE_FILTER)
294 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
296 if (has(zone->flags, family, fw3_to_src_target(t)))
298 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
299 fw3_format_in_out(dev, NULL);
300 fw3_format_src_dest(sub, NULL);
301 fw3_format_extra(zone->extra_src);
302 fw3_pr(" -j %s\n", jump_target(t));
305 if (has(zone->flags, family, t))
307 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
308 fw3_format_in_out(NULL, dev);
309 fw3_format_src_dest(NULL, sub);
310 fw3_format_extra(zone->extra_dest);
311 fw3_pr(" -j %s\n", jump_target(t));
315 fw3_pr("-A delegate_input");
316 fw3_format_in_out(dev, NULL);
317 fw3_format_src_dest(sub, NULL);
318 fw3_format_extra(zone->extra_src);
319 fw3_pr(" -j zone_%s_input\n", zone->name);
321 fw3_pr("-A delegate_forward");
322 fw3_format_in_out(dev, NULL);
323 fw3_format_src_dest(sub, NULL);
324 fw3_format_extra(zone->extra_src);
325 fw3_pr(" -j zone_%s_forward\n", zone->name);
327 fw3_pr("-A delegate_output");
328 fw3_format_in_out(NULL, dev);
329 fw3_format_src_dest(NULL, sub);
330 fw3_format_extra(zone->extra_dest);
331 fw3_pr(" -j zone_%s_output\n", zone->name);
333 else if (table == FW3_TABLE_NAT)
335 if (has(zone->flags, family, FW3_FLAG_DNAT))
337 fw3_pr("-A delegate_prerouting");
338 fw3_format_in_out(dev, NULL);
339 fw3_format_src_dest(sub, NULL);
340 fw3_format_extra(zone->extra_src);
341 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
344 if (has(zone->flags, family, FW3_FLAG_SNAT))
346 fw3_pr("-A delegate_postrouting");
347 fw3_format_in_out(NULL, dev);
348 fw3_format_src_dest(NULL, sub);
349 fw3_format_extra(zone->extra_dest);
350 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
353 else if (table == FW3_TABLE_MANGLE)
360 fw3_format_in_out(NULL, dev);
361 fw3_format_src_dest(NULL, sub);
362 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
363 fw3_format_limit(&zone->log_limit);
364 fw3_format_comment(zone->name, " (mtu_fix logging)");
365 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
369 fw3_format_in_out(NULL, dev);
370 fw3_format_src_dest(NULL, sub);
371 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
372 fw3_format_comment(zone->name, " (mtu_fix)");
373 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
376 else if (table == FW3_TABLE_RAW)
378 if (!zone->conntrack && !disable_notrack)
380 fw3_pr("-A notrack");
381 fw3_format_in_out(dev, NULL);
382 fw3_format_src_dest(sub, NULL);
383 fw3_format_extra(zone->extra_src);
384 fw3_format_comment(zone->name, " (notrack)");
385 fw3_pr(" -j CT --notrack\n", zone->name);
391 print_interface_rules(enum fw3_table table, enum fw3_family family,
392 struct fw3_zone *zone, bool reload, bool disable_notrack)
394 struct fw3_device *dev;
395 struct fw3_address *sub;
397 fw3_foreach(dev, &zone->devices)
398 fw3_foreach(sub, &zone->subnets)
400 if (!fw3_is_family(sub, family))
406 print_interface_rule(table, family, zone, dev, sub, reload, disable_notrack);
411 print_zone_rule(enum fw3_table table, enum fw3_family family,
412 struct fw3_zone *zone, bool reload, bool disable_notrack)
414 struct fw3_address *msrc;
415 struct fw3_address *mdest;
419 if (!fw3_is_family(zone, family))
424 case FW3_TABLE_FILTER:
425 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
426 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
428 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
429 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
431 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
432 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
436 for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
438 if (has(zone->flags, family, fw3_to_src_target(t)))
440 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
441 fw3_format_limit(&zone->log_limit);
442 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
443 fw3_flag_names[t], zone->name);
446 if (has(zone->flags, family, t))
448 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
449 fw3_format_limit(&zone->log_limit);
450 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
451 fw3_flag_names[t], zone->name);
458 if (zone->masq && family == FW3_FAMILY_V4)
460 fw3_foreach(msrc, &zone->masq_src)
461 fw3_foreach(mdest, &zone->masq_dest)
463 fw3_pr("-A zone_%s_postrouting ", zone->name);
464 fw3_format_src_dest(msrc, mdest);
465 fw3_pr("-j MASQUERADE\n");
471 case FW3_TABLE_MANGLE:
475 print_interface_rules(table, family, zone, reload, disable_notrack);
479 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
480 bool reload, struct fw3_state *state)
482 struct fw3_zone *zone;
484 list_for_each_entry(zone, &state->zones, list)
485 print_zone_chain(table, family, zone, reload, state);
489 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
490 bool reload, struct fw3_state *state)
492 struct fw3_zone *zone;
494 list_for_each_entry(zone, &state->zones, list)
495 print_zone_rule(table, family, zone, reload, state->defaults.drop_invalid);
499 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
500 bool pass2, bool reload, struct fw3_state *state)
502 struct fw3_zone *z, *tmp;
503 uint32_t custom_mask = ~0;
505 /* don't touch user chains on selective stop */
507 delbit(custom_mask, FW3_FLAG_CUSTOM_CHAINS);
509 list_for_each_entry_safe(z, tmp, &state->running_zones, running_list)
511 if (!has(z->flags, family, table))
514 fw3_pr_rulespec(table, family, z->flags, custom_mask, zone_chains,
515 pass2 ? "-X %s\n" : "-F %s\n", z->name);
519 del(z->flags, family, table);
525 fw3_hotplug_zones(bool add, struct fw3_state *state)
528 struct fw3_device *d;
532 list_for_each_entry(z, &state->running_zones, running_list)
534 if (!hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
536 list_for_each_entry(d, &z->devices, list)
537 fw3_hotplug(add, z, d);
539 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
545 list_for_each_entry(z, &state->running_zones, running_list)
547 if (hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
549 list_for_each_entry(d, &z->running_devices, list)
550 fw3_hotplug(add, z, d);
552 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
559 fw3_lookup_zone(struct fw3_state *state, const char *name, bool running)
563 if (list_empty(&state->zones))
566 list_for_each_entry(z, &state->zones, list)
568 if (strcmp(z->name, name))
571 if (!running || z->running_list.next)
581 fw3_free_zone(struct fw3_zone *zone)
583 struct fw3_device *dev, *tmp;
585 list_for_each_entry_safe(dev, tmp, &zone->running_devices, list)
587 list_del(&dev->list);
591 list_for_each_entry_safe(dev, tmp, &zone->running_networks, list)
593 list_del(&dev->list);
597 fw3_free_object(zone, fw3_zone_opts);