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),
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),
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);
148 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
150 struct uci_section *s;
151 struct uci_element *e;
152 struct fw3_zone *zone;
153 struct fw3_defaults *defs = &state->defaults;
155 INIT_LIST_HEAD(&state->zones);
157 uci_foreach_element(&p->sections, e)
159 s = uci_to_section(e);
161 if (strcmp(s->type, "zone"))
164 zone = malloc(sizeof(*zone));
169 memset(zone, 0, sizeof(*zone));
171 INIT_LIST_HEAD(&zone->networks);
172 INIT_LIST_HEAD(&zone->devices);
173 INIT_LIST_HEAD(&zone->subnets);
174 INIT_LIST_HEAD(&zone->masq_src);
175 INIT_LIST_HEAD(&zone->masq_dest);
177 zone->log_limit.rate = 10;
179 fw3_parse_options(zone, zone_opts, ARRAY_SIZE(zone_opts), s);
181 if (!zone->extra_dest)
182 zone->extra_dest = zone->extra_src;
184 if (!zone->name || !*zone->name)
186 warn_elem(e, "has no name - ignoring");
191 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
192 list_empty(&zone->subnets) && !zone->extra_src)
194 warn_elem(e, "has no device, network, subnet or extra options");
197 check_policy(e, &zone->policy_input, defs->policy_input, "input");
198 check_policy(e, &zone->policy_output, defs->policy_output, "output");
199 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
201 resolve_networks(e, zone);
205 setbit(zone->dst_flags, FW3_TARGET_SNAT);
206 zone->conntrack = true;
209 setbit(zone->src_flags, zone->policy_input);
210 setbit(zone->dst_flags, zone->policy_output);
211 setbit(zone->dst_flags, zone->policy_forward);
213 list_add_tail(&zone->list, &state->zones);
219 print_zone_chain(enum fw3_table table, enum fw3_family family,
220 struct fw3_zone *zone, bool disable_notrack)
224 if (!fw3_is_family(zone, family))
227 if (!zone->conntrack && !disable_notrack)
228 setbit(zone->dst_flags, FW3_TARGET_NOTRACK);
230 s = print_chains(table, family, ":%s - [0:0]\n", zone->name,
231 zone->src_flags, src_chains, ARRAY_SIZE(src_chains));
233 d = print_chains(table, family, ":%s - [0:0]\n", zone->name,
234 zone->dst_flags, dst_chains, ARRAY_SIZE(dst_chains));
237 info(" * Zone '%s'", zone->name);
241 print_interface_rule(enum fw3_table table, enum fw3_family family,
242 struct fw3_zone *zone, struct fw3_device *dev,
243 struct fw3_address *sub, bool disable_notrack)
247 #define jump_target(t) \
248 ((t == FW3_TARGET_REJECT) ? "reject" : fw3_flag_names[t])
250 if (table == FW3_TABLE_FILTER)
252 for (t = FW3_TARGET_ACCEPT; t <= FW3_TARGET_DROP; t++)
254 if (hasbit(zone->src_flags, t))
256 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
257 fw3_format_in_out(dev, NULL);
258 fw3_format_src_dest(sub, NULL);
259 fw3_format_extra(zone->extra_src);
260 fw3_pr(" -j %s\n", jump_target(t));
263 if (hasbit(zone->dst_flags, t))
265 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
266 fw3_format_in_out(NULL, dev);
267 fw3_format_src_dest(NULL, sub);
268 fw3_format_extra(zone->extra_dest);
269 fw3_pr(" -j %s\n", jump_target(t));
273 fw3_pr("-A delegate_input");
274 fw3_format_in_out(dev, NULL);
275 fw3_format_src_dest(sub, NULL);
276 fw3_format_extra(zone->extra_src);
277 fw3_pr(" -j zone_%s_input\n", zone->name);
279 fw3_pr("-A delegate_forward");
280 fw3_format_in_out(dev, NULL);
281 fw3_format_src_dest(sub, NULL);
282 fw3_format_extra(zone->extra_src);
283 fw3_pr(" -j zone_%s_forward\n", zone->name);
285 fw3_pr("-A delegate_output");
286 fw3_format_in_out(NULL, dev);
287 fw3_format_src_dest(NULL, sub);
288 fw3_format_extra(zone->extra_dest);
289 fw3_pr(" -j zone_%s_output\n", zone->name);
291 else if (table == FW3_TABLE_NAT)
293 if (hasbit(zone->dst_flags, FW3_TARGET_DNAT))
295 fw3_pr("-A delegate_prerouting");
296 fw3_format_in_out(dev, NULL);
297 fw3_format_src_dest(sub, NULL);
298 fw3_format_extra(zone->extra_src);
299 fw3_pr(" -j zone_%s_prerouting\n", zone->name);
302 if (hasbit(zone->dst_flags, FW3_TARGET_SNAT))
304 fw3_pr("-A delegate_postrouting");
305 fw3_format_in_out(NULL, dev);
306 fw3_format_src_dest(NULL, sub);
307 fw3_format_extra(zone->extra_dest);
308 fw3_pr(" -j zone_%s_postrouting\n", zone->name);
311 else if (table == FW3_TABLE_MANGLE)
318 fw3_format_in_out(NULL, dev);
319 fw3_format_src_dest(NULL, sub);
320 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
321 fw3_format_limit(&zone->log_limit);
322 fw3_format_comment(zone->name, " (mtu_fix logging)");
323 fw3_pr(" -j LOG --log-prefix \"MSSFIX(%s): \"\n", zone->name);
327 fw3_format_in_out(NULL, dev);
328 fw3_format_src_dest(NULL, sub);
329 fw3_pr(" -p tcp --tcp-flags SYN,RST SYN");
330 fw3_format_comment(zone->name, " (mtu_fix)");
331 fw3_pr(" -j TCPMSS --clamp-mss-to-pmtu\n");
334 else if (table == FW3_TABLE_RAW)
336 if (!zone->conntrack && !disable_notrack)
338 fw3_pr("-A notrack");
339 fw3_format_in_out(dev, NULL);
340 fw3_format_src_dest(sub, NULL);
341 fw3_format_extra(zone->extra_src);
342 fw3_format_comment(zone->name, " (notrack)");
343 fw3_pr(" -j CT --notrack\n", zone->name);
349 print_interface_rules(enum fw3_table table, enum fw3_family family,
350 struct fw3_zone *zone, bool disable_notrack)
352 struct fw3_device *dev;
353 struct fw3_address *sub;
355 fw3_foreach(dev, &zone->devices)
356 fw3_foreach(sub, &zone->subnets)
358 if (!fw3_is_family(sub, family))
364 print_interface_rule(table, family, zone, dev, sub, disable_notrack);
369 print_zone_rule(enum fw3_table table, enum fw3_family family,
370 struct fw3_zone *zone, bool disable_notrack)
372 struct fw3_address *msrc;
373 struct fw3_address *mdest;
377 if (!fw3_is_family(zone, family))
382 case FW3_TABLE_FILTER:
383 fw3_pr("-A zone_%s_input -j zone_%s_src_%s\n",
384 zone->name, zone->name, fw3_flag_names[zone->policy_input]);
386 fw3_pr("-A zone_%s_forward -j zone_%s_dest_%s\n",
387 zone->name, zone->name, fw3_flag_names[zone->policy_forward]);
389 fw3_pr("-A zone_%s_output -j zone_%s_dest_%s\n",
390 zone->name, zone->name, fw3_flag_names[zone->policy_output]);
394 for (t = FW3_TARGET_REJECT; t <= FW3_TARGET_DROP; t++)
396 if (hasbit(zone->src_flags, t))
398 fw3_pr("-A zone_%s_src_%s", zone->name, fw3_flag_names[t]);
399 fw3_format_limit(&zone->log_limit);
400 fw3_pr(" -j LOG --log-prefix \"%s(src %s)\"\n",
401 fw3_flag_names[t], zone->name);
404 if (hasbit(zone->dst_flags, t))
406 fw3_pr("-A zone_%s_dest_%s", zone->name, fw3_flag_names[t]);
407 fw3_format_limit(&zone->log_limit);
408 fw3_pr(" -j LOG --log-prefix \"%s(dest %s)\"\n",
409 fw3_flag_names[t], zone->name);
416 if (zone->masq && family == FW3_FAMILY_V4)
418 fw3_foreach(msrc, &zone->masq_src)
419 fw3_foreach(mdest, &zone->masq_dest)
421 fw3_pr("-A zone_%s_postrouting ", zone->name);
422 fw3_format_src_dest(msrc, mdest);
423 fw3_pr("-j MASQUERADE\n");
429 case FW3_TABLE_MANGLE:
433 print_interface_rules(table, family, zone, disable_notrack);
437 fw3_print_zone_chains(enum fw3_table table, enum fw3_family family,
438 struct fw3_state *state)
440 struct fw3_zone *zone;
442 list_for_each_entry(zone, &state->zones, list)
443 print_zone_chain(table, family, zone, state->defaults.drop_invalid);
447 fw3_print_zone_rules(enum fw3_table table, enum fw3_family family,
448 struct fw3_state *state)
450 struct fw3_zone *zone;
452 list_for_each_entry(zone, &state->zones, list)
453 print_zone_rule(table, family, zone, state->defaults.drop_invalid);
457 fw3_flush_zones(enum fw3_table table, enum fw3_family family,
458 bool pass2, struct list_head *statefile)
460 struct fw3_statefile_entry *e;
462 list_for_each_entry(e, statefile, list)
464 if (e->type != FW3_TYPE_ZONE)
467 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
468 e->name, e->flags[0], src_chains, ARRAY_SIZE(src_chains));
470 print_chains(table, family, pass2 ? "-X %s\n" : "-F %s\n",
471 e->name, e->flags[1], dst_chains, ARRAY_SIZE(dst_chains));
476 fw3_lookup_zone(struct fw3_state *state, const char *name)
480 if (list_empty(&state->zones))
483 list_for_each_entry(z, &state->zones, list)
484 if (!strcmp(z->name, name))
491 fw3_free_zone(struct fw3_zone *zone)
493 fw3_free_list(&zone->networks);
494 fw3_free_list(&zone->devices);
495 fw3_free_list(&zone->subnets);
497 fw3_free_list(&zone->masq_src);
498 fw3_free_list(&zone->masq_dest);