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_TARGET_##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_target *pol, enum fw3_target def,
105 if (*pol == FW3_TARGET_UNSPEC)
107 warn_elem(e, "has no %s policy specified, using default", name);
110 else if (*pol > FW3_TARGET_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);
132 list_add_tail(&tmp->list, &zone->devices);
139 struct fw3_zone *zone;
141 zone = malloc(sizeof(*zone));
146 memset(zone, 0, sizeof(*zone));
148 INIT_LIST_HEAD(&zone->networks);
149 INIT_LIST_HEAD(&zone->devices);
150 INIT_LIST_HEAD(&zone->subnets);
151 INIT_LIST_HEAD(&zone->masq_src);
152 INIT_LIST_HEAD(&zone->masq_dest);
154 zone->enabled = true;
155 zone->custom_chains = true;
156 zone->log_limit.rate = 10;
162 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
164 struct uci_section *s;
165 struct uci_element *e;
166 struct fw3_zone *zone;
167 struct fw3_defaults *defs = &state->defaults;
169 INIT_LIST_HEAD(&state->zones);
171 uci_foreach_element(&p->sections, e)
173 s = uci_to_section(e);
175 if (strcmp(s->type, "zone"))
178 zone = fw3_alloc_zone();
183 fw3_parse_options(zone, fw3_zone_opts, s);
191 if (!zone->extra_dest)
192 zone->extra_dest = zone->extra_src;
194 if (!defs->custom_chains && zone->custom_chains)
195 zone->custom_chains = false;
197 if (!zone->name || !*zone->name)
199 warn_elem(e, "has no name - ignoring");
204 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
205 list_empty(&zone->subnets) && !zone->extra_src)
207 warn_elem(e, "has no device, network, subnet or extra options");
210 check_policy(e, &zone->policy_input, defs->policy_input, "input");
211 check_policy(e, &zone->policy_output, defs->policy_output, "output");
212 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
214 resolve_networks(e, zone);
218 setbit(zone->flags[0], FW3_TARGET_SNAT);
219 zone->conntrack = true;
222 if (zone->custom_chains)
224 setbit(zone->flags[0], FW3_TARGET_SNAT);
225 setbit(zone->flags[0], FW3_TARGET_DNAT);
228 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
229 setbit(zone->flags[0], zone->policy_output);
230 setbit(zone->flags[0], zone->policy_forward);
232 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
233 setbit(zone->flags[1], zone->policy_output);
234 setbit(zone->flags[1], zone->policy_forward);
236 list_add_tail(&zone->list, &state->zones);
242 print_zone_chain(enum fw3_table table, enum fw3_family family,
243 struct fw3_zone *zone, bool reload, struct fw3_state *state)
246 uint32_t custom_mask = ~0;
248 if (!fw3_is_family(zone, family))
251 set(zone->flags, family, table);
253 /* Don't touch user chains on reload */
255 delbit(custom_mask, FW3_TARGET_CUSTOM_CHAINS);
257 if (zone->custom_chains)
258 set(zone->flags, family, FW3_TARGET_CUSTOM_CHAINS);
260 if (!zone->conntrack && !state->defaults.drop_invalid)
261 set(zone->flags, family, FW3_TARGET_NOTRACK);
263 c = fw3_pr_rulespec(table, family, zone->flags, custom_mask, zone_chains,
264 ":%s - [0:0]\n", zone->name);
266 r = fw3_pr_rulespec(table, family, zone->flags, 0, zone_rules,
267 "-A %s\n", zone->name);
271 info(" * Zone '%s'", zone->name);
272 fw3_set_running(zone, &state->running_zones);
274 set(zone->flags, family, table);
279 print_interface_rule(enum fw3_table table, enum fw3_family family,
280 struct fw3_zone *zone, struct fw3_device *dev,
281 struct fw3_address *sub, bool reload, bool disable_notrack)
285 #define jump_target(t) \
286 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
288 if (table == FW3_TABLE_FILTER)
290 for (t = FW3_TARGET_ACCEPT; t <= FW3_TARGET_DROP; t++)
292 if (has(zone->flags, family, fw3_to_src_target(t)))
294 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
295 fw3_format_in_out(dev, NULL);
296 fw3_format_src_dest(sub, NULL);
297 fw3_format_extra(zone->extra_src);
298 fw3_pr(" -j %s\n", jump_target(t));
301 if (has(zone->flags, family, t))
303 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
304 fw3_format_in_out(NULL, dev);
305 fw3_format_src_dest(NULL, sub);
306 fw3_format_extra(zone->extra_dest);
307 fw3_pr(" -j %s\n", jump_target(t));
311 fw3_pr("-A delegate_input");
312 fw3_format_in_out(dev, NULL);
313 fw3_format_src_dest(sub, NULL);
314 fw3_format_extra(zone->extra_src);
315 fw3_pr(" -j zone_%s_input\n", zone->name);
317 fw3_pr("-A delegate_forward");
318 fw3_format_in_out(dev, NULL);
319 fw3_format_src_dest(sub, NULL);
320 fw3_format_extra(zone->extra_src);
321 fw3_pr(" -j zone_%s_forward\n", zone->name);
323 fw3_pr("-A delegate_output");
324 fw3_format_in_out(NULL, dev);
325 fw3_format_src_dest(NULL, sub);
326 fw3_format_extra(zone->extra_dest);
327 fw3_pr(" -j zone_%s_output\n", zone->name);
329 else if (table == FW3_TABLE_NAT)
331 if (has(zone->flags, family, FW3_TARGET_DNAT))
333 fw3_pr("-A delegate_prerouting");
334 fw3_format_in_out(dev, NULL);
335 fw3_format_src_dest(sub, NULL);
336 fw3_format_extra(zone->extra_src);
337 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
340 if (has(zone->flags, family, FW3_TARGET_SNAT))
342 fw3_pr("-A delegate_postrouting");
343 fw3_format_in_out(NULL, dev);
344 fw3_format_src_dest(NULL, sub);
345 fw3_format_extra(zone->extra_dest);
346 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
349 else if (table == FW3_TABLE_MANGLE)
356 fw3_format_in_out(NULL, dev);
357 fw3_format_src_dest(NULL, sub);
358 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
359 fw3_format_limit(&zone->log_limit);
360 fw3_format_comment(zone->name, " (mtu_fix logging)");
361 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
365 fw3_format_in_out(NULL, dev);
366 fw3_format_src_dest(NULL, sub);
367 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
368 fw3_format_comment(zone->name, " (mtu_fix)");
369 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
372 else if (table == FW3_TABLE_RAW)
374 if (!zone->conntrack && !disable_notrack)
376 fw3_pr("-A notrack");
377 fw3_format_in_out(dev, NULL);
378 fw3_format_src_dest(sub, NULL);
379 fw3_format_extra(zone->extra_src);
380 fw3_format_comment(zone->name, " (notrack)");
381 fw3_pr(" -j CT --notrack\n", zone->name);
387 print_interface_rules(enum fw3_table table, enum fw3_family family,
388 struct fw3_zone *zone, bool reload, bool disable_notrack)
390 struct fw3_device *dev;
391 struct fw3_address *sub;
393 fw3_foreach(dev, &zone->devices)
394 fw3_foreach(sub, &zone->subnets)
396 if (!fw3_is_family(sub, family))
402 print_interface_rule(table, family, zone, dev, sub, reload, disable_notrack);
407 print_zone_rule(enum fw3_table table, enum fw3_family family,
408 struct fw3_zone *zone, bool reload, bool disable_notrack)
410 struct fw3_address *msrc;
411 struct fw3_address *mdest;
415 if (!fw3_is_family(zone, family))
420 case FW3_TABLE_FILTER:
421 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
422 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
424 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
425 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
427 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
428 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
432 for (t = FW3_TARGET_REJECT; t <= FW3_TARGET_DROP; t++)
434 if (has(zone->flags, family, fw3_to_src_target(t)))
436 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
437 fw3_format_limit(&zone->log_limit);
438 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
439 fw3_flag_names[t], zone->name);
442 if (has(zone->flags, family, t))
444 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
445 fw3_format_limit(&zone->log_limit);
446 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
447 fw3_flag_names[t], zone->name);
454 if (zone->masq && family == FW3_FAMILY_V4)
456 fw3_foreach(msrc, &zone->masq_src)
457 fw3_foreach(mdest, &zone->masq_dest)
459 fw3_pr("-A zone_%s_postrouting ", zone->name);
460 fw3_format_src_dest(msrc, mdest);
461 fw3_pr("-j MASQUERADE\n");
467 case FW3_TABLE_MANGLE:
471 print_interface_rules(table, family, zone, reload, disable_notrack);
475 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
476 bool reload, struct fw3_state *state)
478 struct fw3_zone *zone;
480 list_for_each_entry(zone, &state->zones, list)
481 print_zone_chain(table, family, zone, reload, state);
485 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
486 bool reload, struct fw3_state *state)
488 struct fw3_zone *zone;
490 list_for_each_entry(zone, &state->zones, list)
491 print_zone_rule(table, family, zone, reload, state->defaults.drop_invalid);
495 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
496 bool pass2, bool reload, struct fw3_state *state)
498 struct fw3_zone *z, *tmp;
499 uint32_t custom_mask = ~0;
501 /* don't touch user chains on selective stop */
503 delbit(custom_mask, FW3_TARGET_CUSTOM_CHAINS);
505 list_for_each_entry_safe(z, tmp, &state->running_zones, running_list)
507 if (!has(z->flags, family, table))
510 fw3_pr_rulespec(table, family, z->flags, custom_mask, zone_chains,
511 pass2 ? "-X %s\n" : "-F %s\n", z->name);
515 del(z->flags, family, table);
521 fw3_lookup_zone(struct fw3_state *state, const char *name, bool running)
525 if (list_empty(&state->zones))
528 list_for_each_entry(z, &state->zones, list)
530 if (strcmp(z->name, name))
533 if (!running || z->running_list.next)