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, name) \
24 { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_TARGET_##tgt, name }
27 enum fw3_family family;
29 enum fw3_target target;
33 static const struct chain src_chains[] = {
34 C(ANY, FILTER, UNSPEC, "zone_%1$s_input"),
35 C(ANY, FILTER, UNSPEC, "zone_%1$s_output"),
36 C(ANY, FILTER, UNSPEC, "zone_%1$s_forward"),
38 C(ANY, FILTER, SRC_ACCEPT, "zone_%1$s_src_ACCEPT"),
39 C(ANY, FILTER, SRC_REJECT, "zone_%1$s_src_REJECT"),
40 C(ANY, FILTER, SRC_DROP, "zone_%1$s_src_DROP"),
43 static const struct chain dst_chains[] = {
44 C(ANY, FILTER, ACCEPT, "zone_%1$s_dest_ACCEPT"),
45 C(ANY, FILTER, REJECT, "zone_%1$s_dest_REJECT"),
46 C(ANY, FILTER, DROP, "zone_%1$s_dest_DROP"),
48 C(V4, NAT, SNAT, "zone_%1$s_postrouting"),
49 C(V4, NAT, DNAT, "zone_%1$s_prerouting"),
51 C(ANY, FILTER, CUSTOM_CNS_V4, "input_%1$s_rule"),
52 C(ANY, FILTER, CUSTOM_CNS_V4, "output_%1$s_rule"),
53 C(ANY, FILTER, CUSTOM_CNS_V4, "forwarding_%1$s_rule"),
54 C(ANY, FILTER, CUSTOM_CNS_V6, "input_%1$s_rule"),
55 C(ANY, FILTER, CUSTOM_CNS_V6, "output_%1$s_rule"),
56 C(ANY, FILTER, CUSTOM_CNS_V6, "forwarding_%1$s_rule"),
58 C(V4, NAT, CUSTOM_CNS_V4, "prerouting_%1$s_rule"),
59 C(V4, NAT, CUSTOM_CNS_V4, "postrouting_%1$s_rule"),
63 #define R(dir1, dir2) \
64 "zone_%1$s_" #dir1 " -m comment --comment \"user chain for %1$s " \
65 #dir2 "\" -j " #dir2 "_%1$s_rule"
67 static const struct chain def_rules[] = {
68 C(ANY, FILTER, CUSTOM_CNS_V4, R(input, input)),
69 C(ANY, FILTER, CUSTOM_CNS_V4, R(output, output)),
70 C(ANY, FILTER, CUSTOM_CNS_V4, R(forward, forwarding)),
71 C(ANY, FILTER, CUSTOM_CNS_V6, R(input, input)),
72 C(ANY, FILTER, CUSTOM_CNS_V6, R(output, output)),
73 C(ANY, FILTER, CUSTOM_CNS_V6, R(forward, forwarding)),
75 C(V4, NAT, CUSTOM_CNS_V4, R(prerouting, prerouting)),
76 C(V4, NAT, CUSTOM_CNS_V4, R(postrouting, postrouting)),
79 const struct fw3_option fw3_zone_opts[] = {
80 FW3_OPT("enabled", bool, zone, enabled),
82 FW3_OPT("name", string, zone, name),
83 FW3_OPT("family", family, zone, family),
85 FW3_LIST("network", device, zone, networks),
86 FW3_LIST("device", device, zone, devices),
87 FW3_LIST("subnet", address, zone, subnets),
89 FW3_OPT("input", target, zone, policy_input),
90 FW3_OPT("forward", target, zone, policy_forward),
91 FW3_OPT("output", target, zone, policy_output),
93 FW3_OPT("masq", bool, zone, masq),
94 FW3_LIST("masq_src", address, zone, masq_src),
95 FW3_LIST("masq_dest", address, zone, masq_dest),
97 FW3_OPT("extra", string, zone, extra_src),
98 FW3_OPT("extra_src", string, zone, extra_src),
99 FW3_OPT("extra_dest", string, zone, extra_dest),
101 FW3_OPT("conntrack", bool, zone, conntrack),
102 FW3_OPT("mtu_fix", bool, zone, mtu_fix),
103 FW3_OPT("custom_chains", bool, zone, custom_chains),
105 FW3_OPT("log", bool, zone, log),
106 FW3_OPT("log_limit", limit, zone, log_limit),
113 print_chains(enum fw3_table table, enum fw3_family family,
114 const char *fmt, const char *name, uint32_t targets,
115 const struct chain *chains, int n)
118 char cn[256] = { 0 };
119 const struct chain *c;
121 for (c = chains; n > 0; c++, n--)
123 if (!fw3_is_family(c, family))
126 if (c->table != table)
129 if ((c->target != FW3_TARGET_UNSPEC) && !hasbit(targets, c->target))
132 snprintf(cn, sizeof(cn), c->name, name);
142 check_policy(struct uci_element *e, enum fw3_target *pol, enum fw3_target def,
145 if (*pol == FW3_TARGET_UNSPEC)
147 warn_elem(e, "has no %s policy specified, using default", name);
150 else if (*pol > FW3_TARGET_DROP)
152 warn_elem(e, "has invalid %s policy, using default", name);
158 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
160 struct fw3_device *net, *tmp;
162 list_for_each_entry(net, &zone->networks, list)
164 tmp = fw3_ubus_device(net->name);
168 warn_elem(e, "cannot resolve device of network '%s'", net->name);
172 list_add_tail(&tmp->list, &zone->devices);
179 struct fw3_zone *zone;
181 zone = malloc(sizeof(*zone));
186 memset(zone, 0, sizeof(*zone));
188 INIT_LIST_HEAD(&zone->networks);
189 INIT_LIST_HEAD(&zone->devices);
190 INIT_LIST_HEAD(&zone->subnets);
191 INIT_LIST_HEAD(&zone->masq_src);
192 INIT_LIST_HEAD(&zone->masq_dest);
194 zone->enabled = true;
195 zone->custom_chains = true;
196 zone->log_limit.rate = 10;
202 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
204 struct uci_section *s;
205 struct uci_element *e;
206 struct fw3_zone *zone;
207 struct fw3_defaults *defs = &state->defaults;
209 INIT_LIST_HEAD(&state->zones);
211 uci_foreach_element(&p->sections, e)
213 s = uci_to_section(e);
215 if (strcmp(s->type, "zone"))
218 zone = fw3_alloc_zone();
223 fw3_parse_options(zone, fw3_zone_opts, s);
231 if (!zone->extra_dest)
232 zone->extra_dest = zone->extra_src;
234 if (!defs->custom_chains && zone->custom_chains)
235 zone->custom_chains = false;
237 if (!zone->name || !*zone->name)
239 warn_elem(e, "has no name - ignoring");
244 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
245 list_empty(&zone->subnets) && !zone->extra_src)
247 warn_elem(e, "has no device, network, subnet or extra options");
250 check_policy(e, &zone->policy_input, defs->policy_input, "input");
251 check_policy(e, &zone->policy_output, defs->policy_output, "output");
252 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
254 resolve_networks(e, zone);
258 setbit(zone->flags, FW3_TARGET_SNAT);
259 zone->conntrack = true;
262 if (zone->custom_chains)
264 setbit(zone->flags, FW3_TARGET_SNAT);
265 setbit(zone->flags, FW3_TARGET_DNAT);
268 setbit(zone->flags, fw3_to_src_target(zone->policy_input));
269 setbit(zone->flags, zone->policy_output);
270 setbit(zone->flags, zone->policy_forward);
272 list_add_tail(&zone->list, &state->zones);
278 print_zone_chain(enum fw3_table table, enum fw3_family family,
279 struct fw3_zone *zone, struct fw3_state *state)
283 uint32_t custom_mask = ~0;
285 if (!fw3_is_family(zone, family))
288 setbit(zone->flags, family);
290 /* user chains already loaded, don't create again */
291 for (f = FW3_TARGET_CUSTOM_CNS_V4; f <= FW3_TARGET_CUSTOM_CNS_V6; f++)
292 if (hasbit(zone->running_flags, f))
293 delbit(custom_mask, f);
295 if (zone->custom_chains)
296 setbit(zone->flags, (family == FW3_FAMILY_V4) ?
297 FW3_TARGET_CUSTOM_CNS_V4 : FW3_TARGET_CUSTOM_CNS_V6);
299 if (!zone->conntrack && !state->defaults.drop_invalid)
300 setbit(zone->flags, FW3_TARGET_NOTRACK);
302 s = print_chains(table, family, ":%s - [0:0]\n", zone->name,
304 src_chains, ARRAY_SIZE(src_chains));
306 d = print_chains(table, family, ":%s - [0:0]\n", zone->name,
307 zone->flags & custom_mask,
308 dst_chains, ARRAY_SIZE(dst_chains));
310 r = print_chains(table, family, "-A %s\n", zone->name,
312 def_rules, ARRAY_SIZE(def_rules));
316 info(" * Zone '%s'", zone->name);
317 fw3_set_running(zone, &state->running_zones);
322 print_interface_rule(enum fw3_table table, enum fw3_family family,
323 struct fw3_zone *zone, struct fw3_device *dev,
324 struct fw3_address *sub, bool disable_notrack)
328 #define jump_target(t) \
329 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
331 if (table == FW3_TABLE_FILTER)
333 for (t = FW3_TARGET_ACCEPT; t <= FW3_TARGET_DROP; t++)
335 if (hasbit(zone->flags, fw3_to_src_target(t)))
337 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
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 %s\n", jump_target(t));
344 if (hasbit(zone->flags, t))
346 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
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 %s\n", jump_target(t));
354 fw3_pr("-A delegate_input");
355 fw3_format_in_out(dev, NULL);
356 fw3_format_src_dest(sub, NULL);
357 fw3_format_extra(zone->extra_src);
358 fw3_pr(" -j zone_%s_input\n", zone->name);
360 fw3_pr("-A delegate_forward");
361 fw3_format_in_out(dev, NULL);
362 fw3_format_src_dest(sub, NULL);
363 fw3_format_extra(zone->extra_src);
364 fw3_pr(" -j zone_%s_forward\n", zone->name);
366 fw3_pr("-A delegate_output");
367 fw3_format_in_out(NULL, dev);
368 fw3_format_src_dest(NULL, sub);
369 fw3_format_extra(zone->extra_dest);
370 fw3_pr(" -j zone_%s_output\n", zone->name);
372 else if (table == FW3_TABLE_NAT)
374 if (hasbit(zone->flags, FW3_TARGET_DNAT))
376 fw3_pr("-A delegate_prerouting");
377 fw3_format_in_out(dev, NULL);
378 fw3_format_src_dest(sub, NULL);
379 fw3_format_extra(zone->extra_src);
380 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
383 if (hasbit(zone->flags, FW3_TARGET_SNAT))
385 fw3_pr("-A delegate_postrouting");
386 fw3_format_in_out(NULL, dev);
387 fw3_format_src_dest(NULL, sub);
388 fw3_format_extra(zone->extra_dest);
389 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
392 else if (table == FW3_TABLE_MANGLE)
399 fw3_format_in_out(NULL, dev);
400 fw3_format_src_dest(NULL, sub);
401 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
402 fw3_format_limit(&zone->log_limit);
403 fw3_format_comment(zone->name, " (mtu_fix logging)");
404 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
408 fw3_format_in_out(NULL, dev);
409 fw3_format_src_dest(NULL, sub);
410 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
411 fw3_format_comment(zone->name, " (mtu_fix)");
412 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
415 else if (table == FW3_TABLE_RAW)
417 if (!zone->conntrack && !disable_notrack)
419 fw3_pr("-A notrack");
420 fw3_format_in_out(dev, NULL);
421 fw3_format_src_dest(sub, NULL);
422 fw3_format_extra(zone->extra_src);
423 fw3_format_comment(zone->name, " (notrack)");
424 fw3_pr(" -j CT --notrack\n", zone->name);
430 print_interface_rules(enum fw3_table table, enum fw3_family family,
431 struct fw3_zone *zone, bool disable_notrack)
433 struct fw3_device *dev;
434 struct fw3_address *sub;
436 fw3_foreach(dev, &zone->devices)
437 fw3_foreach(sub, &zone->subnets)
439 if (!fw3_is_family(sub, family))
445 print_interface_rule(table, family, zone, dev, sub, disable_notrack);
450 print_zone_rule(enum fw3_table table, enum fw3_family family,
451 struct fw3_zone *zone, bool disable_notrack)
453 struct fw3_address *msrc;
454 struct fw3_address *mdest;
458 if (!fw3_is_family(zone, family))
463 case FW3_TABLE_FILTER:
464 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
465 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
467 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
468 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
470 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
471 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
475 for (t = FW3_TARGET_REJECT; t <= FW3_TARGET_DROP; t++)
477 if (hasbit(zone->flags, fw3_to_src_target(t)))
479 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
480 fw3_format_limit(&zone->log_limit);
481 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
482 fw3_flag_names[t], zone->name);
485 if (hasbit(zone->flags, t))
487 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
488 fw3_format_limit(&zone->log_limit);
489 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
490 fw3_flag_names[t], zone->name);
497 if (zone->masq && family == FW3_FAMILY_V4)
499 fw3_foreach(msrc, &zone->masq_src)
500 fw3_foreach(mdest, &zone->masq_dest)
502 fw3_pr("-A zone_%s_postrouting ", zone->name);
503 fw3_format_src_dest(msrc, mdest);
504 fw3_pr("-j MASQUERADE\n");
510 case FW3_TABLE_MANGLE:
514 print_interface_rules(table, family, zone, disable_notrack);
518 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
519 struct fw3_state *state)
521 struct fw3_zone *zone;
523 list_for_each_entry(zone, &state->zones, list)
524 print_zone_chain(table, family, zone, state);
528 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
529 struct fw3_state *state)
531 struct fw3_zone *zone;
533 list_for_each_entry(zone, &state->zones, list)
534 print_zone_rule(table, family, zone, state->defaults.drop_invalid);
538 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
539 bool pass2, bool reload, struct fw3_state *state)
541 struct fw3_zone *z, *tmp;
542 uint32_t custom_mask = ~0;
544 /* don't touch user chains on selective stop */
547 delbit(custom_mask, FW3_TARGET_CUSTOM_CNS_V4);
548 delbit(custom_mask, FW3_TARGET_CUSTOM_CNS_V6);
551 list_for_each_entry_safe(z, tmp, &state->running_zones, running_list)
553 if (!hasbit(z->flags, family))
556 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
557 z->name, z->running_flags,
558 src_chains, ARRAY_SIZE(src_chains));
560 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
561 z->name, z->running_flags & custom_mask,
562 dst_chains, ARRAY_SIZE(dst_chains));
566 delbit(z->flags, family);
568 if (fw3_no_family(z))
569 fw3_set_running(z, NULL);
575 fw3_lookup_zone(struct fw3_state *state, const char *name, bool running)
579 if (list_empty(&state->zones))
582 list_for_each_entry(z, &state->zones, list)
584 if (strcmp(z->name, name))
587 if (!running || z->running_list.next)