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("name", string, zone, name),
54 FW3_OPT("family", family, zone, family),
56 FW3_LIST("network", device, zone, networks),
57 FW3_LIST("device", device, zone, devices),
58 FW3_LIST("subnet", address, zone, subnets),
60 FW3_OPT("input", target, zone, policy_input),
61 FW3_OPT("forward", target, zone, policy_forward),
62 FW3_OPT("output", target, zone, policy_output),
64 FW3_OPT("masq", bool, zone, masq),
65 FW3_LIST("masq_src", address, zone, masq_src),
66 FW3_LIST("masq_dest", address, zone, masq_dest),
68 FW3_OPT("extra", string, zone, extra_src),
69 FW3_OPT("extra_src", string, zone, extra_src),
70 FW3_OPT("extra_dest", string, zone, extra_dest),
72 FW3_OPT("conntrack", bool, zone, conntrack),
73 FW3_OPT("mtu_fix", bool, zone, mtu_fix),
74 FW3_OPT("custom_chains", bool, zone, custom_chains),
76 FW3_OPT("log", bool, zone, log),
77 FW3_OPT("log_limit", limit, zone, log_limit),
84 print_chains(enum fw3_table table, enum fw3_family family,
85 const char *fmt, const char *name, uint16_t targets,
86 const struct chain *chains, int n)
90 const struct chain *c;
92 for (c = chains; n > 0; c++, n--)
94 if (!fw3_is_family(c, family))
97 if (c->table != table)
100 if ((c->target != FW3_TARGET_UNSPEC) && !hasbit(targets, c->target))
103 snprintf(cn, sizeof(cn), c->name, name);
113 check_policy(struct uci_element *e, enum fw3_target *pol, enum fw3_target def,
116 if (*pol == FW3_TARGET_UNSPEC)
118 warn_elem(e, "has no %s policy specified, using default", name);
121 else if (*pol > FW3_TARGET_DROP)
123 warn_elem(e, "has invalid %s policy, using default", name);
129 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
131 struct fw3_device *net, *tmp;
133 list_for_each_entry(net, &zone->networks, list)
135 tmp = fw3_ubus_device(net->name);
139 warn_elem(e, "cannot resolve device of network '%s'", net->name);
143 list_add_tail(&tmp->list, &zone->devices);
150 struct fw3_zone *zone;
152 zone = malloc(sizeof(*zone));
157 memset(zone, 0, sizeof(*zone));
159 INIT_LIST_HEAD(&zone->networks);
160 INIT_LIST_HEAD(&zone->devices);
161 INIT_LIST_HEAD(&zone->subnets);
162 INIT_LIST_HEAD(&zone->masq_src);
163 INIT_LIST_HEAD(&zone->masq_dest);
165 zone->log_limit.rate = 10;
171 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
173 struct uci_section *s;
174 struct uci_element *e;
175 struct fw3_zone *zone;
176 struct fw3_defaults *defs = &state->defaults;
178 INIT_LIST_HEAD(&state->zones);
180 uci_foreach_element(&p->sections, e)
182 s = uci_to_section(e);
184 if (strcmp(s->type, "zone"))
187 zone = fw3_alloc_zone();
192 fw3_parse_options(zone, fw3_zone_opts, s);
194 if (!zone->extra_dest)
195 zone->extra_dest = zone->extra_src;
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->dst_flags, FW3_TARGET_SNAT);
219 zone->conntrack = true;
222 setbit(zone->src_flags, zone->policy_input);
223 setbit(zone->dst_flags, zone->policy_output);
224 setbit(zone->dst_flags, zone->policy_forward);
226 list_add_tail(&zone->list, &state->zones);
232 print_zone_chain(enum fw3_table table, enum fw3_family family,
233 struct fw3_zone *zone, struct fw3_state *state)
237 if (!fw3_is_family(zone, family))
240 setbit(zone->dst_flags, family);
242 if (!zone->conntrack && !state->defaults.drop_invalid)
243 setbit(zone->dst_flags, FW3_TARGET_NOTRACK);
245 s = print_chains(table, family, ":%s - [0:0]\n", zone->name,
246 zone->src_flags, src_chains, ARRAY_SIZE(src_chains));
248 d = print_chains(table, family, ":%s - [0:0]\n", zone->name,
249 zone->dst_flags, dst_chains, ARRAY_SIZE(dst_chains));
253 info(" * Zone '%s'", zone->name);
254 fw3_set_running(zone, &state->running_zones);
259 print_interface_rule(enum fw3_table table, enum fw3_family family,
260 struct fw3_zone *zone, struct fw3_device *dev,
261 struct fw3_address *sub, bool disable_notrack)
265 #define jump_target(t) \
266 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
268 if (table == FW3_TABLE_FILTER)
270 for (t = FW3_TARGET_ACCEPT; t <= FW3_TARGET_DROP; t++)
272 if (hasbit(zone->src_flags, t))
274 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
275 fw3_format_in_out(dev, NULL);
276 fw3_format_src_dest(sub, NULL);
277 fw3_format_extra(zone->extra_src);
278 fw3_pr(" -j %s\n", jump_target(t));
281 if (hasbit(zone->dst_flags, t))
283 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
284 fw3_format_in_out(NULL, dev);
285 fw3_format_src_dest(NULL, sub);
286 fw3_format_extra(zone->extra_dest);
287 fw3_pr(" -j %s\n", jump_target(t));
291 fw3_pr("-A delegate_input");
292 fw3_format_in_out(dev, NULL);
293 fw3_format_src_dest(sub, NULL);
294 fw3_format_extra(zone->extra_src);
295 fw3_pr(" -j zone_%s_input\n", zone->name);
297 fw3_pr("-A delegate_forward");
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_forward\n", zone->name);
303 fw3_pr("-A delegate_output");
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 zone_%s_output\n", zone->name);
309 else if (table == FW3_TABLE_NAT)
311 if (hasbit(zone->dst_flags, FW3_TARGET_DNAT))
313 fw3_pr("-A delegate_prerouting");
314 fw3_format_in_out(dev, NULL);
315 fw3_format_src_dest(sub, NULL);
316 fw3_format_extra(zone->extra_src);
317 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
320 if (hasbit(zone->dst_flags, FW3_TARGET_SNAT))
322 fw3_pr("-A delegate_postrouting");
323 fw3_format_in_out(NULL, dev);
324 fw3_format_src_dest(NULL, sub);
325 fw3_format_extra(zone->extra_dest);
326 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
329 else if (table == FW3_TABLE_MANGLE)
336 fw3_format_in_out(NULL, dev);
337 fw3_format_src_dest(NULL, sub);
338 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
339 fw3_format_limit(&zone->log_limit);
340 fw3_format_comment(zone->name, " (mtu_fix logging)");
341 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
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_comment(zone->name, " (mtu_fix)");
349 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
352 else if (table == FW3_TABLE_RAW)
354 if (!zone->conntrack && !disable_notrack)
356 fw3_pr("-A notrack");
357 fw3_format_in_out(dev, NULL);
358 fw3_format_src_dest(sub, NULL);
359 fw3_format_extra(zone->extra_src);
360 fw3_format_comment(zone->name, " (notrack)");
361 fw3_pr(" -j CT --notrack\n", zone->name);
367 print_interface_rules(enum fw3_table table, enum fw3_family family,
368 struct fw3_zone *zone, bool disable_notrack)
370 struct fw3_device *dev;
371 struct fw3_address *sub;
373 fw3_foreach(dev, &zone->devices)
374 fw3_foreach(sub, &zone->subnets)
376 if (!fw3_is_family(sub, family))
382 print_interface_rule(table, family, zone, dev, sub, disable_notrack);
387 print_zone_rule(enum fw3_table table, enum fw3_family family,
388 struct fw3_zone *zone, bool disable_notrack)
390 struct fw3_address *msrc;
391 struct fw3_address *mdest;
395 if (!fw3_is_family(zone, family))
400 case FW3_TABLE_FILTER:
401 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
402 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
404 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
405 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
407 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
408 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
412 for (t = FW3_TARGET_REJECT; t <= FW3_TARGET_DROP; t++)
414 if (hasbit(zone->src_flags, t))
416 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
417 fw3_format_limit(&zone->log_limit);
418 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
419 fw3_flag_names[t], zone->name);
422 if (hasbit(zone->dst_flags, t))
424 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
425 fw3_format_limit(&zone->log_limit);
426 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
427 fw3_flag_names[t], zone->name);
434 if (zone->masq && family == FW3_FAMILY_V4)
436 fw3_foreach(msrc, &zone->masq_src)
437 fw3_foreach(mdest, &zone->masq_dest)
439 fw3_pr("-A zone_%s_postrouting ", zone->name);
440 fw3_format_src_dest(msrc, mdest);
441 fw3_pr("-j MASQUERADE\n");
447 case FW3_TABLE_MANGLE:
451 print_interface_rules(table, family, zone, disable_notrack);
455 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
456 struct fw3_state *state)
458 struct fw3_zone *zone;
460 list_for_each_entry(zone, &state->zones, list)
461 print_zone_chain(table, family, zone, state);
465 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
466 struct fw3_state *state)
468 struct fw3_zone *zone;
470 list_for_each_entry(zone, &state->zones, list)
471 print_zone_rule(table, family, zone, state->defaults.drop_invalid);
475 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
476 bool pass2, struct fw3_state *state)
478 struct fw3_zone *z, *tmp;
479 int mask = (1 << FW3_FAMILY_V4) | (1 << FW3_FAMILY_V6);
481 list_for_each_entry_safe(z, tmp, &state->running_zones, running_list)
483 if (!hasbit(z->dst_flags, family))
486 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
487 z->name, z->src_flags, src_chains, ARRAY_SIZE(src_chains));
489 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
490 z->name, z->dst_flags, dst_chains, ARRAY_SIZE(dst_chains));
494 delbit(z->dst_flags, family);
496 if (!(z->dst_flags & mask))
497 fw3_set_running(z, NULL);
503 fw3_lookup_zone(struct fw3_state *state, const char *name, bool running)
507 if (list_empty(&state->zones))
510 list_for_each_entry(z, &state->zones, list)
512 if (strcmp(z->name, name))
515 if (!running || z->running_list.next)