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_FLAG_##tgt, fmt }
26 static const struct fw3_chain_spec zone_chains[] = {
27 C(ANY, FILTER, UNSPEC, "zone_%s_input"),
28 C(ANY, FILTER, UNSPEC, "zone_%s_output"),
29 C(ANY, FILTER, UNSPEC, "zone_%s_forward"),
31 C(ANY, FILTER, SRC_ACCEPT, "zone_%s_src_ACCEPT"),
32 C(ANY, FILTER, SRC_REJECT, "zone_%s_src_REJECT"),
33 C(ANY, FILTER, SRC_DROP, "zone_%s_src_DROP"),
35 C(ANY, FILTER, ACCEPT, "zone_%s_dest_ACCEPT"),
36 C(ANY, FILTER, REJECT, "zone_%s_dest_REJECT"),
37 C(ANY, FILTER, DROP, "zone_%s_dest_DROP"),
39 C(V4, NAT, SNAT, "zone_%s_postrouting"),
40 C(V4, NAT, DNAT, "zone_%s_prerouting"),
42 C(ANY, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
43 C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
44 C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
46 C(V4, NAT, CUSTOM_CHAINS, "prerouting_%s_rule"),
47 C(V4, NAT, CUSTOM_CHAINS, "postrouting_%s_rule"),
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", network, 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", network, zone, masq_src),
68 FW3_LIST("masq_dest", network, 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),
81 FW3_OPT("__flags_v4", int, zone, flags[0]),
82 FW3_OPT("__flags_v6", int, zone, flags[1]),
89 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
92 if (*pol == FW3_FLAG_UNSPEC)
94 warn_elem(e, "has no %s policy specified, using default", name);
97 else if (*pol > FW3_FLAG_DROP)
99 warn_elem(e, "has invalid %s policy, using default", name);
105 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
107 struct fw3_device *net, *tmp;
109 list_for_each_entry(net, &zone->networks, list)
111 tmp = fw3_ubus_device(net->name);
115 warn_elem(e, "cannot resolve device of network '%s'", net->name);
119 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
120 list_add_tail(&tmp->list, &zone->devices);
127 struct fw3_zone *zone;
129 zone = malloc(sizeof(*zone));
134 memset(zone, 0, sizeof(*zone));
136 INIT_LIST_HEAD(&zone->networks);
137 INIT_LIST_HEAD(&zone->devices);
138 INIT_LIST_HEAD(&zone->subnets);
139 INIT_LIST_HEAD(&zone->masq_src);
140 INIT_LIST_HEAD(&zone->masq_dest);
142 zone->enabled = true;
143 zone->custom_chains = true;
144 zone->log_limit.rate = 10;
150 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
152 struct uci_section *s;
153 struct uci_element *e;
154 struct fw3_zone *zone;
155 struct fw3_defaults *defs = &state->defaults;
157 INIT_LIST_HEAD(&state->zones);
159 uci_foreach_element(&p->sections, e)
161 s = uci_to_section(e);
163 if (strcmp(s->type, "zone"))
166 zone = fw3_alloc_zone();
171 fw3_parse_options(zone, fw3_zone_opts, s);
179 if (!zone->extra_dest)
180 zone->extra_dest = zone->extra_src;
182 if (!defs->custom_chains && zone->custom_chains)
183 zone->custom_chains = false;
185 if (!zone->name || !*zone->name)
187 warn_elem(e, "has no name - ignoring");
192 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
194 warn_elem(e, "must not have a name longer than %u characters",
195 FW3_ZONE_MAXNAMELEN);
200 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
201 list_empty(&zone->subnets) && !zone->extra_src)
203 warn_elem(e, "has no device, network, subnet or extra options");
206 check_policy(e, &zone->policy_input, defs->policy_input, "input");
207 check_policy(e, &zone->policy_output, defs->policy_output, "output");
208 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
210 resolve_networks(e, zone);
214 setbit(zone->flags[0], FW3_FLAG_SNAT);
215 zone->conntrack = true;
218 if (zone->custom_chains)
220 setbit(zone->flags[0], FW3_FLAG_SNAT);
221 setbit(zone->flags[0], FW3_FLAG_DNAT);
224 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
225 setbit(zone->flags[0], fw3_to_src_target(zone->policy_forward));
226 setbit(zone->flags[0], zone->policy_output);
228 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
229 setbit(zone->flags[1], fw3_to_src_target(zone->policy_forward));
230 setbit(zone->flags[1], zone->policy_output);
232 list_add_tail(&zone->list, &state->zones);
238 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
239 bool reload, struct fw3_zone *zone)
242 struct fw3_ipt_rule *r;
243 const struct fw3_chain_spec *c;
245 const char *flt_chains[] = {
248 "forward", "forwarding",
251 const char *nat_chains[] = {
252 "prerouting", "prerouting",
253 "postrouting", "postrouting",
256 if (!fw3_is_family(zone, handle->family))
259 info(" * Zone '%s'", zone->name);
261 set(zone->flags, handle->family, handle->table);
263 if (zone->custom_chains)
264 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
266 if (!zone->conntrack && !state->defaults.drop_invalid)
267 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
269 for (c = zone_chains; c->format; c++)
271 /* don't touch user chains on selective stop */
272 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
275 if (!fw3_is_family(c, handle->family))
278 if (c->table != handle->table)
282 !hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
285 fw3_ipt_create_chain(handle, c->format, zone->name);
288 if (zone->custom_chains)
290 if (handle->table == FW3_TABLE_FILTER)
292 for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
294 r = fw3_ipt_rule_new(handle);
295 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
296 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
297 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
300 else if (handle->table == FW3_TABLE_NAT)
302 for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
304 r = fw3_ipt_rule_new(handle);
305 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
306 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
307 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
312 set(zone->flags, handle->family, handle->table);
316 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
317 bool reload, struct fw3_zone *zone,
318 struct fw3_device *dev, struct fw3_address *sub)
320 bool disable_notrack = state->defaults.drop_invalid;
321 struct fw3_protocol tcp = { .protocol = 6 };
322 struct fw3_ipt_rule *r;
329 const char *chains[] = {
335 #define jump_target(t) \
336 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
338 if (handle->table == FW3_TABLE_FILTER)
340 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
342 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
344 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
345 fw3_ipt_rule_target(r, jump_target(t));
346 fw3_ipt_rule_extra(r, zone->extra_src);
347 fw3_ipt_rule_append(r, "zone_%s_src_%s", zone->name,
351 if (has(zone->flags, handle->family, t))
353 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
354 fw3_ipt_rule_target(r, jump_target(t));
355 fw3_ipt_rule_extra(r, zone->extra_dest);
356 fw3_ipt_rule_append(r, "zone_%s_dest_%s", zone->name,
361 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i++)
363 if (*chains[i] == 'o')
364 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
366 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
368 fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
370 if (*chains[i] == 'o')
371 fw3_ipt_rule_extra(r, zone->extra_dest);
373 fw3_ipt_rule_extra(r, zone->extra_src);
375 fw3_ipt_rule_append(r, "delegate_%s", chains[i]);
378 else if (handle->table == FW3_TABLE_NAT)
380 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
382 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
383 fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
384 fw3_ipt_rule_extra(r, zone->extra_src);
385 fw3_ipt_rule_append(r, "delegate_prerouting");
388 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
390 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
391 fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
392 fw3_ipt_rule_extra(r, zone->extra_dest);
393 fw3_ipt_rule_append(r, "delegate_postrouting");
396 else if (handle->table == FW3_TABLE_MANGLE)
402 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
404 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
405 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
406 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
407 fw3_ipt_rule_limit(r, &zone->log_limit);
408 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
409 fw3_ipt_rule_target(r, "LOG");
410 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
411 fw3_ipt_rule_append(r, "mssfix");
414 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
415 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
416 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
417 fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
418 fw3_ipt_rule_target(r, "TCPMSS");
419 fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
420 fw3_ipt_rule_append(r, "mssfix");
423 else if (handle->table == FW3_TABLE_RAW)
425 if (!zone->conntrack && !disable_notrack)
427 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
428 fw3_ipt_rule_target(r, "CT");
429 fw3_ipt_rule_addarg(r, false, "--notrack", NULL);
430 fw3_ipt_rule_extra(r, zone->extra_src);
431 fw3_ipt_rule_append(r, "notrack");
437 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
438 bool reload, struct fw3_zone *zone)
440 struct fw3_device *dev;
441 struct fw3_address *sub;
443 fw3_foreach(dev, &zone->devices)
444 fw3_foreach(sub, &zone->subnets)
446 if (!fw3_is_family(sub, handle->family))
452 print_interface_rule(handle, state, reload, zone, dev, sub);
457 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
458 bool reload, struct fw3_zone *zone)
460 struct fw3_address *msrc;
461 struct fw3_address *mdest;
462 struct fw3_ipt_rule *r;
467 if (!fw3_is_family(zone, handle->family))
470 switch (handle->table)
472 case FW3_TABLE_FILTER:
473 r = fw3_ipt_rule_new(handle);
474 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
475 fw3_flag_names[zone->policy_input]);
476 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
478 r = fw3_ipt_rule_new(handle);
479 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
480 fw3_flag_names[zone->policy_forward]);
481 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
483 r = fw3_ipt_rule_new(handle);
484 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
485 fw3_flag_names[zone->policy_output]);
486 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
490 for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
492 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
494 r = fw3_ipt_rule_new(handle);
496 snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
497 fw3_flag_names[t], zone->name);
499 fw3_ipt_rule_limit(r, &zone->log_limit);
500 fw3_ipt_rule_target(r, "LOG");
501 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
502 fw3_ipt_rule_append(r, "zone_%s_src_%s",
503 zone->name, fw3_flag_names[t]);
506 if (has(zone->flags, handle->family, t))
508 r = fw3_ipt_rule_new(handle);
510 snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
511 fw3_flag_names[t], zone->name);
513 fw3_ipt_rule_limit(r, &zone->log_limit);
514 fw3_ipt_rule_target(r, "LOG");
515 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
516 fw3_ipt_rule_append(r, "zone_%s_dest_%s",
517 zone->name, fw3_flag_names[t]);
524 if (zone->masq && handle->family == FW3_FAMILY_V4)
526 fw3_foreach(msrc, &zone->masq_src)
527 fw3_foreach(mdest, &zone->masq_dest)
529 if (!fw3_is_family(msrc, handle->family) ||
530 !fw3_is_family(mdest, handle->family))
533 r = fw3_ipt_rule_new(handle);
534 fw3_ipt_rule_src_dest(r, msrc, mdest);
535 fw3_ipt_rule_target(r, "MASQUERADE");
536 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
542 case FW3_TABLE_MANGLE:
546 print_interface_rules(handle, state, reload, zone);
550 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
553 struct fw3_zone *zone;
555 list_for_each_entry(zone, &state->zones, list)
556 print_zone_chain(handle, state, reload, zone);
560 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
563 struct fw3_zone *zone;
565 list_for_each_entry(zone, &state->zones, list)
566 print_zone_rule(handle, state, reload, zone);
570 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
573 struct fw3_zone *z, *tmp;
574 const struct fw3_chain_spec *c;
577 list_for_each_entry_safe(z, tmp, &state->zones, list)
579 if (!has(z->flags, handle->family, handle->table))
582 for (c = zone_chains; c->format; c++)
584 /* don't touch user chains on selective stop */
585 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
588 if (!fw3_is_family(c, handle->family))
591 if (c->table != handle->table)
594 if (c->flag && !has(z->flags, handle->family, c->flag))
597 snprintf(chain, sizeof(chain), c->format, z->name);
598 fw3_ipt_flush_chain(handle, chain);
600 /* keep certain basic chains that do not depend on any settings to
601 avoid purging unrelated user rules pointing to them */
602 if (reload && !c->flag)
605 fw3_ipt_delete_chain(handle, chain);
608 del(z->flags, handle->family, handle->table);
613 fw3_hotplug_zones(struct fw3_state *state, bool add)
616 struct fw3_device *d;
618 list_for_each_entry(z, &state->zones, list)
620 if (add != hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
622 list_for_each_entry(d, &z->devices, list)
623 fw3_hotplug(add, z, d);
626 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
628 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
634 fw3_lookup_zone(struct fw3_state *state, const char *name)
638 if (list_empty(&state->zones))
641 list_for_each_entry(z, &state->zones, list)
643 if (strcmp(z->name, name))
653 fw3_resolve_zone_addresses(struct fw3_zone *zone)
655 struct fw3_device *net;
656 struct fw3_address *addr, *tmp;
657 struct list_head *addrs, *all;
659 all = malloc(sizeof(*all));
664 memset(all, 0, sizeof(*all));
667 list_for_each_entry(net, &zone->networks, list)
669 addrs = fw3_ubus_address(net->name);
674 list_for_each_entry_safe(addr, tmp, addrs, list)
676 list_del(&addr->list);
677 list_add_tail(&addr->list, all);
683 list_for_each_entry(addr, &zone->subnets, list)
685 tmp = malloc(sizeof(*tmp));
690 memcpy(tmp, addr, sizeof(*tmp));
691 list_add_tail(&tmp->list, all);