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_%s_input"),
35 C(ANY, FILTER, UNSPEC, "zone_%s_output"),
36 C(ANY, FILTER, UNSPEC, "zone_%s_forward"),
38 C(ANY, FILTER, ACCEPT, "zone_%s_src_ACCEPT"),
39 C(ANY, FILTER, REJECT, "zone_%s_src_REJECT"),
40 C(ANY, FILTER, DROP, "zone_%s_src_DROP"),
43 static const struct chain dst_chains[] = {
44 C(ANY, FILTER, ACCEPT, "zone_%s_dest_ACCEPT"),
45 C(ANY, FILTER, REJECT, "zone_%s_dest_REJECT"),
46 C(ANY, FILTER, DROP, "zone_%s_dest_DROP"),
48 C(V4, NAT, SNAT, "zone_%s_postrouting"),
49 C(V4, NAT, DNAT, "zone_%s_prerouting"),
52 const struct fw3_option fw3_zone_opts[] = {
53 FW3_OPT("enabled", bool, zone, enabled),
55 FW3_OPT("name", string, zone, name),
56 FW3_OPT("family", family, zone, family),
58 FW3_LIST("network", device, zone, networks),
59 FW3_LIST("device", device, zone, devices),
60 FW3_LIST("subnet", address, zone, subnets),
62 FW3_OPT("input", target, zone, policy_input),
63 FW3_OPT("forward", target, zone, policy_forward),
64 FW3_OPT("output", target, zone, policy_output),
66 FW3_OPT("masq", bool, zone, masq),
67 FW3_LIST("masq_src", address, zone, masq_src),
68 FW3_LIST("masq_dest", address, zone, masq_dest),
70 FW3_OPT("extra", string, zone, extra_src),
71 FW3_OPT("extra_src", string, zone, extra_src),
72 FW3_OPT("extra_dest", string, zone, extra_dest),
74 FW3_OPT("conntrack", bool, zone, conntrack),
75 FW3_OPT("mtu_fix", bool, zone, mtu_fix),
76 FW3_OPT("custom_chains", bool, zone, custom_chains),
78 FW3_OPT("log", bool, zone, log),
79 FW3_OPT("log_limit", limit, zone, log_limit),
86 print_chains(enum fw3_table table, enum fw3_family family,
87 const char *fmt, const char *name, uint16_t targets,
88 const struct chain *chains, int n)
92 const struct chain *c;
94 for (c = chains; n > 0; c++, n--)
96 if (!fw3_is_family(c, family))
99 if (c->table != table)
102 if ((c->target != FW3_TARGET_UNSPEC) && !hasbit(targets, c->target))
105 snprintf(cn, sizeof(cn), c->name, name);
115 check_policy(struct uci_element *e, enum fw3_target *pol, enum fw3_target def,
118 if (*pol == FW3_TARGET_UNSPEC)
120 warn_elem(e, "has no %s policy specified, using default", name);
123 else if (*pol > FW3_TARGET_DROP)
125 warn_elem(e, "has invalid %s policy, using default", name);
131 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
133 struct fw3_device *net, *tmp;
135 list_for_each_entry(net, &zone->networks, list)
137 tmp = fw3_ubus_device(net->name);
141 warn_elem(e, "cannot resolve device of network '%s'", net->name);
145 list_add_tail(&tmp->list, &zone->devices);
152 struct fw3_zone *zone;
154 zone = malloc(sizeof(*zone));
159 memset(zone, 0, sizeof(*zone));
161 INIT_LIST_HEAD(&zone->networks);
162 INIT_LIST_HEAD(&zone->devices);
163 INIT_LIST_HEAD(&zone->subnets);
164 INIT_LIST_HEAD(&zone->masq_src);
165 INIT_LIST_HEAD(&zone->masq_dest);
167 zone->enabled = true;
168 zone->log_limit.rate = 10;
174 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
176 struct uci_section *s;
177 struct uci_element *e;
178 struct fw3_zone *zone;
179 struct fw3_defaults *defs = &state->defaults;
181 INIT_LIST_HEAD(&state->zones);
183 uci_foreach_element(&p->sections, e)
185 s = uci_to_section(e);
187 if (strcmp(s->type, "zone"))
190 zone = fw3_alloc_zone();
195 fw3_parse_options(zone, fw3_zone_opts, s);
203 if (!zone->extra_dest)
204 zone->extra_dest = zone->extra_src;
206 if (!zone->name || !*zone->name)
208 warn_elem(e, "has no name - ignoring");
213 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
214 list_empty(&zone->subnets) && !zone->extra_src)
216 warn_elem(e, "has no device, network, subnet or extra options");
219 check_policy(e, &zone->policy_input, defs->policy_input, "input");
220 check_policy(e, &zone->policy_output, defs->policy_output, "output");
221 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
223 resolve_networks(e, zone);
227 setbit(zone->dst_flags, FW3_TARGET_SNAT);
228 zone->conntrack = true;
231 setbit(zone->src_flags, zone->policy_input);
232 setbit(zone->dst_flags, zone->policy_output);
233 setbit(zone->dst_flags, zone->policy_forward);
235 list_add_tail(&zone->list, &state->zones);
241 print_zone_chain(enum fw3_table table, enum fw3_family family,
242 struct fw3_zone *zone, struct fw3_state *state)
246 if (!fw3_is_family(zone, family))
249 setbit(zone->dst_flags, family);
251 if (!zone->conntrack && !state->defaults.drop_invalid)
252 setbit(zone->dst_flags, FW3_TARGET_NOTRACK);
254 s = print_chains(table, family, ":%s - [0:0]\n", zone->name,
255 zone->src_flags, src_chains, ARRAY_SIZE(src_chains));
257 d = print_chains(table, family, ":%s - [0:0]\n", zone->name,
258 zone->dst_flags, dst_chains, ARRAY_SIZE(dst_chains));
262 info(" * Zone '%s'", zone->name);
263 fw3_set_running(zone, &state->running_zones);
268 print_interface_rule(enum fw3_table table, enum fw3_family family,
269 struct fw3_zone *zone, struct fw3_device *dev,
270 struct fw3_address *sub, bool disable_notrack)
274 #define jump_target(t) \
275 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
277 if (table == FW3_TABLE_FILTER)
279 for (t = FW3_TARGET_ACCEPT; t <= FW3_TARGET_DROP; t++)
281 if (hasbit(zone->src_flags, t))
283 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
284 fw3_format_in_out(dev, NULL);
285 fw3_format_src_dest(sub, NULL);
286 fw3_format_extra(zone->extra_src);
287 fw3_pr(" -j %s\n", jump_target(t));
290 if (hasbit(zone->dst_flags, t))
292 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
293 fw3_format_in_out(NULL, dev);
294 fw3_format_src_dest(NULL, sub);
295 fw3_format_extra(zone->extra_dest);
296 fw3_pr(" -j %s\n", jump_target(t));
300 fw3_pr("-A delegate_input");
301 fw3_format_in_out(dev, NULL);
302 fw3_format_src_dest(sub, NULL);
303 fw3_format_extra(zone->extra_src);
304 fw3_pr(" -j zone_%s_input\n", zone->name);
306 fw3_pr("-A delegate_forward");
307 fw3_format_in_out(dev, NULL);
308 fw3_format_src_dest(sub, NULL);
309 fw3_format_extra(zone->extra_src);
310 fw3_pr(" -j zone_%s_forward\n", zone->name);
312 fw3_pr("-A delegate_output");
313 fw3_format_in_out(NULL, dev);
314 fw3_format_src_dest(NULL, sub);
315 fw3_format_extra(zone->extra_dest);
316 fw3_pr(" -j zone_%s_output\n", zone->name);
318 else if (table == FW3_TABLE_NAT)
320 if (hasbit(zone->dst_flags, FW3_TARGET_DNAT))
322 fw3_pr("-A delegate_prerouting");
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_prerouting\n", zone->name);
329 if (hasbit(zone->dst_flags, FW3_TARGET_SNAT))
331 fw3_pr("-A delegate_postrouting");
332 fw3_format_in_out(NULL, dev);
333 fw3_format_src_dest(NULL, sub);
334 fw3_format_extra(zone->extra_dest);
335 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
338 else if (table == FW3_TABLE_MANGLE)
345 fw3_format_in_out(NULL, dev);
346 fw3_format_src_dest(NULL, sub);
347 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
348 fw3_format_limit(&zone->log_limit);
349 fw3_format_comment(zone->name, " (mtu_fix logging)");
350 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
354 fw3_format_in_out(NULL, dev);
355 fw3_format_src_dest(NULL, sub);
356 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
357 fw3_format_comment(zone->name, " (mtu_fix)");
358 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
361 else if (table == FW3_TABLE_RAW)
363 if (!zone->conntrack && !disable_notrack)
365 fw3_pr("-A notrack");
366 fw3_format_in_out(dev, NULL);
367 fw3_format_src_dest(sub, NULL);
368 fw3_format_extra(zone->extra_src);
369 fw3_format_comment(zone->name, " (notrack)");
370 fw3_pr(" -j CT --notrack\n", zone->name);
376 print_interface_rules(enum fw3_table table, enum fw3_family family,
377 struct fw3_zone *zone, bool disable_notrack)
379 struct fw3_device *dev;
380 struct fw3_address *sub;
382 fw3_foreach(dev, &zone->devices)
383 fw3_foreach(sub, &zone->subnets)
385 if (!fw3_is_family(sub, family))
391 print_interface_rule(table, family, zone, dev, sub, disable_notrack);
396 print_zone_rule(enum fw3_table table, enum fw3_family family,
397 struct fw3_zone *zone, bool disable_notrack)
399 struct fw3_address *msrc;
400 struct fw3_address *mdest;
404 if (!fw3_is_family(zone, family))
409 case FW3_TABLE_FILTER:
410 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
411 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
413 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
414 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
416 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
417 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
421 for (t = FW3_TARGET_REJECT; t <= FW3_TARGET_DROP; t++)
423 if (hasbit(zone->src_flags, t))
425 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
426 fw3_format_limit(&zone->log_limit);
427 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
428 fw3_flag_names[t], zone->name);
431 if (hasbit(zone->dst_flags, t))
433 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
434 fw3_format_limit(&zone->log_limit);
435 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
436 fw3_flag_names[t], zone->name);
443 if (zone->masq && family == FW3_FAMILY_V4)
445 fw3_foreach(msrc, &zone->masq_src)
446 fw3_foreach(mdest, &zone->masq_dest)
448 fw3_pr("-A zone_%s_postrouting ", zone->name);
449 fw3_format_src_dest(msrc, mdest);
450 fw3_pr("-j MASQUERADE\n");
456 case FW3_TABLE_MANGLE:
460 print_interface_rules(table, family, zone, disable_notrack);
464 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
465 struct fw3_state *state)
467 struct fw3_zone *zone;
469 list_for_each_entry(zone, &state->zones, list)
470 print_zone_chain(table, family, zone, state);
474 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
475 struct fw3_state *state)
477 struct fw3_zone *zone;
479 list_for_each_entry(zone, &state->zones, list)
480 print_zone_rule(table, family, zone, state->defaults.drop_invalid);
484 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
485 bool pass2, struct fw3_state *state)
487 struct fw3_zone *z, *tmp;
488 int mask = (1 << FW3_FAMILY_V4) | (1 << FW3_FAMILY_V6);
490 list_for_each_entry_safe(z, tmp, &state->running_zones, running_list)
492 if (!hasbit(z->dst_flags, family))
495 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
496 z->name, z->src_flags, src_chains, ARRAY_SIZE(src_chains));
498 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
499 z->name, z->dst_flags, dst_chains, ARRAY_SIZE(dst_chains));
503 delbit(z->dst_flags, family);
505 if (!(z->dst_flags & mask))
506 fw3_set_running(z, NULL);
512 fw3_lookup_zone(struct fw3_state *state, const char *name, bool running)
516 if (list_empty(&state->zones))
519 list_for_each_entry(z, &state->zones, list)
521 if (strcmp(z->name, name))
524 if (!running || z->running_list.next)