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"),
51 C(ANY, RAW, NOTRACK, "zone_%s_notrack"),
54 static struct fw3_option zone_opts[] = {
55 FW3_OPT("name", string, zone, name),
57 FW3_LIST("network", device, zone, networks),
58 FW3_LIST("device", device, zone, devices),
59 FW3_LIST("subnet", address, zone, subnets),
61 FW3_OPT("input", target, zone, policy_input),
62 FW3_OPT("forward", target, zone, policy_forward),
63 FW3_OPT("output", target, zone, policy_output),
65 FW3_OPT("masq", bool, zone, masq),
66 FW3_LIST("masq_src", address, zone, masq_src),
67 FW3_LIST("masq_dest", address, zone, masq_dest),
69 FW3_OPT("extra", string, zone, extra_src),
70 FW3_OPT("extra_src", string, zone, extra_src),
71 FW3_OPT("extra_dest", string, zone, extra_dest),
73 FW3_OPT("conntrack", bool, zone, conntrack),
74 FW3_OPT("mtu_fix", bool, zone, mtu_fix),
75 FW3_OPT("custom_chains", bool, zone, custom_chains),
77 FW3_OPT("log", bool, zone, log),
78 FW3_OPT("log_limit", limit, zone, log_limit),
83 print_chains(enum fw3_table table, enum fw3_family family,
84 const char *fmt, const char *name, uint8_t targets,
85 const struct chain *chains, int n)
89 const struct chain *c;
91 for (c = chains; n > 0; c++, n--)
93 if (!fw3_is_family(c, family))
96 if (c->table != table)
99 if ((c->target != FW3_TARGET_UNSPEC) && !(targets & (1 << c->target)))
102 snprintf(cn, sizeof(cn), c->name, name);
112 check_policy(struct uci_element *e, enum fw3_target *pol, enum fw3_target def,
115 if (*pol == FW3_TARGET_UNSPEC)
117 warn_elem(e, "has no %s policy specified, using default", name);
120 else if (*pol > FW3_TARGET_DROP)
122 warn_elem(e, "has invalid %s policy, using default", name);
128 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
130 struct fw3_device *net, *tmp;
132 list_for_each_entry(net, &zone->networks, list)
134 tmp = fw3_ubus_device(net->name);
138 warn_elem(e, "cannot resolve device of network '%s'", net->name);
142 list_add_tail(&tmp->list, &zone->devices);
147 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
149 struct uci_section *s;
150 struct uci_element *e;
151 struct fw3_zone *zone;
152 struct fw3_defaults *defs = &state->defaults;
154 INIT_LIST_HEAD(&state->zones);
156 uci_foreach_element(&p->sections, e)
158 s = uci_to_section(e);
160 if (strcmp(s->type, "zone"))
163 zone = malloc(sizeof(*zone));
168 memset(zone, 0, sizeof(*zone));
170 INIT_LIST_HEAD(&zone->networks);
171 INIT_LIST_HEAD(&zone->devices);
172 INIT_LIST_HEAD(&zone->subnets);
173 INIT_LIST_HEAD(&zone->masq_src);
174 INIT_LIST_HEAD(&zone->masq_dest);
176 zone->log_limit.rate = 10;
178 fw3_parse_options(zone, zone_opts, ARRAY_SIZE(zone_opts), s);
180 if (!zone->extra_dest)
181 zone->extra_dest = zone->extra_src;
183 if (!zone->name || !*zone->name)
185 warn_elem(e, "has no name - ignoring");
190 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
191 list_empty(&zone->subnets) && !zone->extra_src)
193 warn_elem(e, "has no device, network, subnet or extra options");
196 check_policy(e, &zone->policy_input, defs->policy_input, "input");
197 check_policy(e, &zone->policy_output, defs->policy_output, "output");
198 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
200 resolve_networks(e, zone);
204 setbit(zone->dst_flags, FW3_TARGET_SNAT);
205 zone->conntrack = true;
208 setbit(zone->src_flags, zone->policy_input);
209 setbit(zone->dst_flags, zone->policy_output);
210 setbit(zone->dst_flags, zone->policy_forward);
212 list_add_tail(&zone->list, &state->zones);
218 print_zone_chain(enum fw3_table table, enum fw3_family family,
219 struct fw3_zone *zone, bool disable_notrack)
223 if (!fw3_is_family(zone, family))
226 if (!zone->conntrack && !disable_notrack)
227 setbit(zone->dst_flags, FW3_TARGET_NOTRACK);
229 s = print_chains(table, family, ":%s - [0:0]\n", zone->name,
230 zone->src_flags, src_chains, ARRAY_SIZE(src_chains));
232 d = print_chains(table, family, ":%s - [0:0]\n", zone->name,
233 zone->dst_flags, dst_chains, ARRAY_SIZE(dst_chains));
236 info(" * Zone '%s'", zone->name);
240 print_interface_rule(enum fw3_table table, enum fw3_family family,
241 struct fw3_zone *zone, struct fw3_device *dev,
242 struct fw3_address *sub, bool disable_notrack)
245 const char *targets[] = {
252 if (table == FW3_TABLE_FILTER)
254 for (t = FW3_TARGET_ACCEPT; t <= FW3_TARGET_DROP; t++)
256 if (zone->src_flags & (1 << t))
258 fw3_pr("-A zone_%s_src_%s", zone->name, targets[t*2]);
259 fw3_format_in_out(dev, NULL);
260 fw3_format_src_dest(sub, NULL);
261 fw3_format_extra(zone->extra_src);
262 fw3_pr(" -j %s\n", targets[t*2+1]);
265 if (zone->dst_flags & (1 << t))
267 fw3_pr("-A zone_%s_dest_%s", zone->name, targets[t*2]);
268 fw3_format_in_out(NULL, dev);
269 fw3_format_src_dest(NULL, sub);
270 fw3_format_extra(zone->extra_dest);
271 fw3_pr(" -j %s\n", targets[t*2+1]);
275 fw3_pr("-A delegate_input");
276 fw3_format_in_out(dev, NULL);
277 fw3_format_src_dest(sub, NULL);
278 fw3_format_extra(zone->extra_src);
279 fw3_pr(" -j zone_%s_input\n", zone->name);
281 fw3_pr("-A delegate_forward");
282 fw3_format_in_out(dev, NULL);
283 fw3_format_src_dest(sub, NULL);
284 fw3_format_extra(zone->extra_src);
285 fw3_pr(" -j zone_%s_forward\n", zone->name);
287 fw3_pr("-A delegate_output");
288 fw3_format_in_out(NULL, dev);
289 fw3_format_src_dest(NULL, sub);
290 fw3_format_extra(zone->extra_dest);
291 fw3_pr(" -j zone_%s_output\n", zone->name);
293 else if (table == FW3_TABLE_NAT)
295 if (zone->dst_flags & (1 << FW3_TARGET_DNAT))
297 fw3_pr("-A delegate_prerouting");
298 fw3_format_in_out(dev, NULL);
299 fw3_format_src_dest(sub, NULL);
300 fw3_format_extra(zone->extra_src);
301 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
304 if (zone->dst_flags & (1 << FW3_TARGET_SNAT))
306 fw3_pr("-A delegate_postrouting");
307 fw3_format_in_out(NULL, dev);
308 fw3_format_src_dest(NULL, sub);
309 fw3_format_extra(zone->extra_dest);
310 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
313 else if (table == FW3_TABLE_MANGLE)
320 fw3_format_in_out(NULL, dev);
321 fw3_format_src_dest(NULL, sub);
322 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
323 fw3_format_limit(&zone->log_limit);
324 fw3_format_comment(zone->name, " (mtu_fix logging)");
325 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
329 fw3_format_in_out(NULL, dev);
330 fw3_format_src_dest(NULL, sub);
331 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
332 fw3_format_comment(zone->name, " (mtu_fix)");
333 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
336 else if (table == FW3_TABLE_RAW)
338 if (!zone->conntrack && !disable_notrack)
340 fw3_pr("-A notrack");
341 fw3_format_in_out(dev, NULL);
342 fw3_format_src_dest(sub, NULL);
343 fw3_format_extra(zone->extra_src);
344 fw3_format_comment(zone->name, " (notrack)");
345 fw3_pr(" -j CT --notrack\n", zone->name);
351 print_interface_rules(enum fw3_table table, enum fw3_family family,
352 struct fw3_zone *zone, bool disable_notrack)
354 struct fw3_device *dev;
355 struct fw3_address *sub;
357 fw3_foreach(dev, &zone->devices)
358 fw3_foreach(sub, &zone->subnets)
360 if (!fw3_is_family(sub, family))
366 print_interface_rule(table, family, zone, dev, sub, disable_notrack);
371 print_zone_rule(enum fw3_table table, enum fw3_family family,
372 struct fw3_zone *zone, bool disable_notrack)
374 struct fw3_address *msrc;
375 struct fw3_address *mdest;
378 const char *targets[] = {
388 if (!fw3_is_family(zone, family))
393 case FW3_TABLE_FILTER:
394 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
395 zone->name, zone->name, targets[zone->policy_input]);
397 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
398 zone->name, zone->name, targets[zone->policy_forward]);
400 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
401 zone->name, zone->name, targets[zone->policy_output]);
405 for (t = FW3_TARGET_REJECT; t <= FW3_TARGET_DROP; t++)
407 if (zone->src_flags & (1 << t))
409 fw3_pr("-A zone_%s_src_%s", zone->name, targets[t]);
410 fw3_format_limit(&zone->log_limit);
411 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
412 targets[t], zone->name);
415 if (zone->dst_flags & (1 << t))
417 fw3_pr("-A zone_%s_dest_%s", zone->name, targets[t]);
418 fw3_format_limit(&zone->log_limit);
419 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
420 targets[t], zone->name);
427 if (zone->masq && family == FW3_FAMILY_V4)
429 fw3_foreach(msrc, &zone->masq_src)
430 fw3_foreach(mdest, &zone->masq_dest)
432 fw3_pr("-A zone_%s_postrouting ", zone->name);
433 fw3_format_src_dest(msrc, mdest);
434 fw3_pr("-j MASQUERADE\n");
440 case FW3_TABLE_MANGLE:
444 print_interface_rules(table, family, zone, disable_notrack);
448 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
449 struct fw3_state *state)
451 struct fw3_zone *zone;
453 list_for_each_entry(zone, &state->zones, list)
454 print_zone_chain(table, family, zone, state->defaults.drop_invalid);
458 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
459 struct fw3_state *state)
461 struct fw3_zone *zone;
463 list_for_each_entry(zone, &state->zones, list)
464 print_zone_rule(table, family, zone, state->defaults.drop_invalid);
468 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
469 bool pass2, struct list_head *statefile)
471 struct fw3_statefile_entry *e;
473 list_for_each_entry(e, statefile, list)
475 if (e->type != FW3_TYPE_ZONE)
478 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
479 e->name, e->flags[0], src_chains, ARRAY_SIZE(src_chains));
481 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
482 e->name, e->flags[1], dst_chains, ARRAY_SIZE(dst_chains));
487 fw3_lookup_zone(struct fw3_state *state, const char *name)
491 if (list_empty(&state->zones))
494 list_for_each_entry(z, &state->zones, list)
495 if (!strcmp(z->name, name))
502 fw3_free_zone(struct fw3_zone *zone)
504 fw3_free_list(&zone->networks);
505 fw3_free_list(&zone->devices);
506 fw3_free_list(&zone->subnets);
508 fw3_free_list(&zone->masq_src);
509 fw3_free_list(&zone->masq_dest);