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e00d527a114904cabe634c02382de4a0d123f591
[project/firewall3.git] / zones.c
1 /*
2 * firewall3 - 3rd OpenWrt UCI firewall implementation
3 *
4 * Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
5 *
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.
9 *
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.
17 */
18
19 #include "zones.h"
20 #include "ubus.h"
21 #include "helpers.h"
22
23
24 #define C(f, tbl, tgt, fmt) \
25 { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
26
27 static const struct fw3_chain_spec zone_chains[] = {
28 C(ANY, FILTER, UNSPEC, "zone_%s_input"),
29 C(ANY, FILTER, UNSPEC, "zone_%s_output"),
30 C(ANY, FILTER, UNSPEC, "zone_%s_forward"),
31
32 C(ANY, FILTER, SRC_ACCEPT, "zone_%s_src_ACCEPT"),
33 C(ANY, FILTER, SRC_REJECT, "zone_%s_src_REJECT"),
34 C(ANY, FILTER, SRC_DROP, "zone_%s_src_DROP"),
35
36 C(ANY, FILTER, ACCEPT, "zone_%s_dest_ACCEPT"),
37 C(ANY, FILTER, REJECT, "zone_%s_dest_REJECT"),
38 C(ANY, FILTER, DROP, "zone_%s_dest_DROP"),
39
40 C(V4, NAT, SNAT, "zone_%s_postrouting"),
41 C(V4, NAT, DNAT, "zone_%s_prerouting"),
42
43 C(ANY, RAW, HELPER, "zone_%s_helper"),
44 C(ANY, RAW, NOTRACK, "zone_%s_notrack"),
45
46 C(ANY, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
47 C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
48 C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
49
50 C(V4, NAT, CUSTOM_CHAINS, "prerouting_%s_rule"),
51 C(V4, NAT, CUSTOM_CHAINS, "postrouting_%s_rule"),
52
53 { }
54 };
55
56 enum fw3_zone_logmask {
57 FW3_ZONE_LOG_FILTER = (1 << 0),
58 FW3_ZONE_LOG_MANGLE = (1 << 1),
59 };
60
61 const struct fw3_option fw3_zone_opts[] = {
62 FW3_OPT("enabled", bool, zone, enabled),
63
64 FW3_OPT("name", string, zone, name),
65 FW3_OPT("family", family, zone, family),
66
67 FW3_LIST("network", device, zone, networks),
68 FW3_LIST("device", device, zone, devices),
69 FW3_LIST("subnet", network, zone, subnets),
70
71 FW3_OPT("input", target, zone, policy_input),
72 FW3_OPT("forward", target, zone, policy_forward),
73 FW3_OPT("output", target, zone, policy_output),
74
75 FW3_OPT("masq", bool, zone, masq),
76 FW3_OPT("masq_allow_invalid", bool, zone, masq_allow_invalid),
77 FW3_LIST("masq_src", network, zone, masq_src),
78 FW3_LIST("masq_dest", network, zone, masq_dest),
79
80 FW3_OPT("extra", string, zone, extra_src),
81 FW3_OPT("extra_src", string, zone, extra_src),
82 FW3_OPT("extra_dest", string, zone, extra_dest),
83
84 FW3_OPT("mtu_fix", bool, zone, mtu_fix),
85 FW3_OPT("custom_chains", bool, zone, custom_chains),
86
87 FW3_OPT("log", int, zone, log),
88 FW3_OPT("log_limit", limit, zone, log_limit),
89
90 FW3_OPT("auto_helper", bool, zone, auto_helper),
91 FW3_LIST("helper", cthelper, zone, cthelpers),
92
93 FW3_OPT("__flags_v4", int, zone, flags[0]),
94 FW3_OPT("__flags_v6", int, zone, flags[1]),
95
96 FW3_LIST("__addrs", address, zone, old_addrs),
97
98 { }
99 };
100
101
102 static void
103 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
104 const char *name)
105 {
106 if (*pol == FW3_FLAG_UNSPEC)
107 {
108 warn_elem(e, "has no %s policy specified, using default", name);
109 *pol = def;
110 }
111 else if (*pol > FW3_FLAG_DROP)
112 {
113 warn_elem(e, "has invalid %s policy, using default", name);
114 *pol = def;
115 }
116 }
117
118 static bool
119 check_masq_addrs(struct list_head *head)
120 {
121 struct fw3_address *addr;
122 int n_addr = 0, n_failed = 0;
123
124 list_for_each_entry(addr, head, list)
125 {
126 if (addr->invert)
127 continue;
128
129 n_addr++;
130
131 if (!addr->set && addr->resolved)
132 n_failed++;
133 }
134
135 return (n_addr == 0 || n_failed < n_addr);
136 }
137
138 static void
139 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
140 {
141 struct fw3_device *net, *tmp;
142
143 list_for_each_entry(net, &zone->networks, list)
144 {
145 tmp = fw3_ubus_device(net->name);
146
147 if (!tmp)
148 {
149 warn_elem(e, "cannot resolve device of network '%s'", net->name);
150 continue;
151 }
152
153 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
154 list_add_tail(&tmp->list, &zone->devices);
155 }
156 }
157
158 static void
159 resolve_cthelpers(struct fw3_state *s, struct uci_element *e, struct fw3_zone *zone)
160 {
161 struct fw3_cthelpermatch *match;
162
163 if (list_empty(&zone->cthelpers))
164 {
165 if (!zone->masq && zone->auto_helper)
166 {
167 fw3_setbit(zone->flags[0], FW3_FLAG_HELPER);
168 fw3_setbit(zone->flags[1], FW3_FLAG_HELPER);
169 }
170
171 return;
172 }
173
174 list_for_each_entry(match, &zone->cthelpers, list)
175 {
176 if (match->invert)
177 {
178 warn_elem(e, "must not use a negated helper match");
179 continue;
180 }
181
182 match->ptr = fw3_lookup_cthelper(s, match->name);
183
184 if (!match->ptr)
185 {
186 warn_elem(e, "refers to not existing helper '%s'", match->name);
187 continue;
188 }
189
190 if (fw3_is_family(match->ptr, FW3_FAMILY_V4))
191 fw3_setbit(zone->flags[0], FW3_FLAG_HELPER);
192
193 if (fw3_is_family(match->ptr, FW3_FAMILY_V6))
194 fw3_setbit(zone->flags[1], FW3_FLAG_HELPER);
195 }
196 }
197
198 struct fw3_zone *
199 fw3_alloc_zone(void)
200 {
201 struct fw3_zone *zone;
202
203 zone = calloc(1, sizeof(*zone));
204 if (!zone)
205 return NULL;
206
207 INIT_LIST_HEAD(&zone->networks);
208 INIT_LIST_HEAD(&zone->devices);
209 INIT_LIST_HEAD(&zone->subnets);
210 INIT_LIST_HEAD(&zone->masq_src);
211 INIT_LIST_HEAD(&zone->masq_dest);
212 INIT_LIST_HEAD(&zone->cthelpers);
213
214 INIT_LIST_HEAD(&zone->old_addrs);
215
216 zone->enabled = true;
217 zone->auto_helper = true;
218 zone->custom_chains = true;
219 zone->log_limit.rate = 10;
220
221 return zone;
222 }
223
224 void
225 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
226 {
227 struct uci_section *s;
228 struct uci_element *e;
229 struct fw3_zone *zone;
230 struct fw3_defaults *defs = &state->defaults;
231
232 INIT_LIST_HEAD(&state->zones);
233
234 uci_foreach_element(&p->sections, e)
235 {
236 s = uci_to_section(e);
237
238 if (strcmp(s->type, "zone"))
239 continue;
240
241 zone = fw3_alloc_zone();
242
243 if (!zone)
244 continue;
245
246 if (!fw3_parse_options(zone, fw3_zone_opts, s))
247 warn_elem(e, "has invalid options");
248
249 if (!zone->enabled)
250 {
251 fw3_free_zone(zone);
252 continue;
253 }
254
255 if (!zone->extra_dest)
256 zone->extra_dest = zone->extra_src;
257
258 if (!defs->custom_chains && zone->custom_chains)
259 zone->custom_chains = false;
260
261 if (!defs->auto_helper && zone->auto_helper)
262 zone->auto_helper = false;
263
264 if (!zone->name || !*zone->name)
265 {
266 warn_elem(e, "has no name - ignoring");
267 fw3_free_zone(zone);
268 continue;
269 }
270
271 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
272 {
273 warn_elem(e, "must not have a name longer than %u characters",
274 FW3_ZONE_MAXNAMELEN);
275 fw3_free_zone(zone);
276 continue;
277 }
278
279 fw3_ubus_zone_devices(zone);
280
281 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
282 list_empty(&zone->subnets) && !zone->extra_src)
283 {
284 warn_elem(e, "has no device, network, subnet or extra options");
285 }
286
287 if (!check_masq_addrs(&zone->masq_src))
288 {
289 warn_elem(e, "has unresolved masq_src, disabling masq");
290 zone->masq = false;
291 }
292
293 if (!check_masq_addrs(&zone->masq_dest))
294 {
295 warn_elem(e, "has unresolved masq_dest, disabling masq");
296 zone->masq = false;
297 }
298
299 check_policy(e, &zone->policy_input, defs->policy_input, "input");
300 check_policy(e, &zone->policy_output, defs->policy_output, "output");
301 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
302
303 resolve_networks(e, zone);
304
305 if (zone->masq)
306 {
307 fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
308 }
309
310 if (zone->custom_chains)
311 {
312 fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
313 fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
314 }
315
316 resolve_cthelpers(state, e, zone);
317
318 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
319 fw3_setbit(zone->flags[0], zone->policy_forward);
320 fw3_setbit(zone->flags[0], zone->policy_output);
321
322 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
323 fw3_setbit(zone->flags[1], zone->policy_forward);
324 fw3_setbit(zone->flags[1], zone->policy_output);
325
326 list_add_tail(&zone->list, &state->zones);
327 }
328 }
329
330
331 static void
332 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
333 bool reload, struct fw3_zone *zone)
334 {
335 int i;
336 struct fw3_ipt_rule *r;
337 const struct fw3_chain_spec *c;
338
339 const char *flt_chains[] = {
340 "input", "input",
341 "output", "output",
342 "forward", "forwarding",
343 };
344
345 const char *nat_chains[] = {
346 "prerouting", "prerouting",
347 "postrouting", "postrouting",
348 };
349
350 if (!fw3_is_family(zone, handle->family))
351 return;
352
353 set(zone->flags, handle->family, handle->table);
354
355 if (zone->custom_chains)
356 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
357
358 for (c = zone_chains; c->format; c++)
359 {
360 /* don't touch user chains on selective stop */
361 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
362 continue;
363
364 if (!fw3_is_family(c, handle->family))
365 continue;
366
367 if (c->table != handle->table)
368 continue;
369
370 if (c->flag &&
371 !fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
372 continue;
373
374 fw3_ipt_create_chain(handle, c->format, zone->name);
375 }
376
377 if (zone->custom_chains)
378 {
379 if (handle->table == FW3_TABLE_FILTER)
380 {
381 for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
382 {
383 r = fw3_ipt_rule_new(handle);
384 fw3_ipt_rule_comment(r, "Custom %s %s rule chain", zone->name, flt_chains[i+1]);
385 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
386 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
387 }
388 }
389 else if (handle->table == FW3_TABLE_NAT)
390 {
391 for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
392 {
393 r = fw3_ipt_rule_new(handle);
394 fw3_ipt_rule_comment(r, "Custom %s %s rule chain", zone->name, nat_chains[i+1]);
395 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
396 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
397 }
398 }
399 }
400
401 set(zone->flags, handle->family, handle->table);
402 }
403
404 static void
405 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
406 bool reload, struct fw3_zone *zone,
407 struct fw3_device *dev, struct fw3_address *sub)
408 {
409 struct fw3_protocol tcp = { .protocol = 6 };
410 struct fw3_ipt_rule *r;
411 enum fw3_flag t;
412
413 char buf[32];
414
415 int i;
416
417 const char *chains[] = {
418 "input", "INPUT",
419 "output", "OUTPUT",
420 "forward", "FORWARD",
421 };
422
423 #define jump_target(t) \
424 ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
425
426 if (handle->table == FW3_TABLE_FILTER)
427 {
428 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
429 {
430 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
431 {
432 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
433 fw3_ipt_rule_target(r, jump_target(t));
434 fw3_ipt_rule_extra(r, zone->extra_src);
435
436 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
437 fw3_ipt_rule_extra(r,
438 "-m conntrack --ctstate NEW,UNTRACKED");
439
440 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
441 fw3_flag_names[t]);
442 }
443
444 if (has(zone->flags, handle->family, t))
445 {
446 if (t == FW3_FLAG_ACCEPT &&
447 zone->masq && !zone->masq_allow_invalid)
448 {
449 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
450 fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID");
451 fw3_ipt_rule_comment(r, "Prevent NAT leakage");
452 fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_DROP]);
453 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
454 fw3_flag_names[t]);
455 }
456
457 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
458 fw3_ipt_rule_target(r, jump_target(t));
459 fw3_ipt_rule_extra(r, zone->extra_dest);
460 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
461 fw3_flag_names[t]);
462 }
463 }
464
465 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
466 {
467 if (*chains[i] == 'o')
468 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
469 else
470 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
471
472 fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
473
474 if (*chains[i] == 'o')
475 fw3_ipt_rule_extra(r, zone->extra_dest);
476 else
477 fw3_ipt_rule_extra(r, zone->extra_src);
478
479 fw3_ipt_rule_replace(r, chains[i + 1]);
480 }
481 }
482 else if (handle->table == FW3_TABLE_NAT)
483 {
484 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
485 {
486 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
487 fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
488 fw3_ipt_rule_extra(r, zone->extra_src);
489 fw3_ipt_rule_replace(r, "PREROUTING");
490 }
491
492 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
493 {
494 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
495 fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
496 fw3_ipt_rule_extra(r, zone->extra_dest);
497 fw3_ipt_rule_replace(r, "POSTROUTING");
498 }
499 }
500 else if (handle->table == FW3_TABLE_MANGLE)
501 {
502 if (zone->mtu_fix)
503 {
504 if (zone->log & FW3_ZONE_LOG_MANGLE)
505 {
506 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
507
508 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
509 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
510 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
511 fw3_ipt_rule_limit(r, &zone->log_limit);
512 fw3_ipt_rule_comment(r, "Zone %s MTU fix logging", zone->name);
513 fw3_ipt_rule_target(r, "LOG");
514 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
515 fw3_ipt_rule_replace(r, "FORWARD");
516 }
517
518 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
519 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
520 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
521 fw3_ipt_rule_comment(r, "Zone %s MTU fixing", zone->name);
522 fw3_ipt_rule_target(r, "TCPMSS");
523 fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
524 fw3_ipt_rule_replace(r, "FORWARD");
525 }
526 }
527 else if (handle->table == FW3_TABLE_RAW)
528 {
529 if (has(zone->flags, handle->family, FW3_FLAG_HELPER))
530 {
531 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
532 fw3_ipt_rule_comment(r, "%s CT helper assignment", zone->name);
533 fw3_ipt_rule_target(r, "zone_%s_helper", zone->name);
534 fw3_ipt_rule_extra(r, zone->extra_src);
535 fw3_ipt_rule_replace(r, "PREROUTING");
536 }
537
538 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
539 {
540 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
541 fw3_ipt_rule_comment(r, "%s CT bypass", zone->name);
542 fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
543 fw3_ipt_rule_extra(r, zone->extra_src);
544 fw3_ipt_rule_replace(r, "PREROUTING");
545 }
546 }
547 }
548
549 static void
550 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
551 bool reload, struct fw3_zone *zone)
552 {
553 struct fw3_device *dev;
554 struct fw3_address *sub;
555
556 fw3_foreach(dev, &zone->devices)
557 fw3_foreach(sub, &zone->subnets)
558 {
559 if (!fw3_is_family(sub, handle->family))
560 continue;
561
562 if (!dev && !sub)
563 continue;
564
565 print_interface_rule(handle, state, reload, zone, dev, sub);
566 }
567 }
568
569 static struct fw3_address *
570 next_addr(struct fw3_address *addr, struct list_head *list,
571 enum fw3_family family, bool invert)
572 {
573 struct list_head *p;
574 struct fw3_address *rv;
575
576 for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
577 {
578 rv = list_entry(p, struct fw3_address, list);
579
580 if (fw3_is_family(rv, family) && rv->set && rv->invert == invert)
581 return rv;
582 }
583
584 return NULL;
585 }
586
587 static void
588 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
589 bool reload, struct fw3_zone *zone)
590 {
591 bool first_src, first_dest;
592 struct fw3_address *msrc;
593 struct fw3_address *mdest;
594 struct fw3_ipt_rule *r;
595
596 enum fw3_flag t;
597 char buf[32];
598
599 if (!fw3_is_family(zone, handle->family))
600 return;
601
602 info(" * Zone '%s'", zone->name);
603
604 switch (handle->table)
605 {
606 case FW3_TABLE_FILTER:
607 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
608 {
609 r = fw3_ipt_rule_new(handle);
610 fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
611 fw3_ipt_rule_comment(r, "Accept port redirections");
612 fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
613 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
614
615 r = fw3_ipt_rule_new(handle);
616 fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
617 fw3_ipt_rule_comment(r, "Accept port forwards");
618 fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
619 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
620 }
621
622 r = fw3_ipt_rule_new(handle);
623 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
624 fw3_flag_names[zone->policy_input]);
625 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
626
627 r = fw3_ipt_rule_new(handle);
628 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
629 fw3_flag_names[zone->policy_forward]);
630 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
631
632 r = fw3_ipt_rule_new(handle);
633 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
634 fw3_flag_names[zone->policy_output]);
635 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
636
637 if (zone->log & FW3_ZONE_LOG_FILTER)
638 {
639 for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
640 {
641 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
642 {
643 r = fw3_ipt_rule_new(handle);
644
645 snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
646 fw3_flag_names[t], zone->name);
647
648 fw3_ipt_rule_limit(r, &zone->log_limit);
649 fw3_ipt_rule_target(r, "LOG");
650 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
651 fw3_ipt_rule_append(r, "zone_%s_src_%s",
652 zone->name, fw3_flag_names[t]);
653 }
654
655 if (has(zone->flags, handle->family, t))
656 {
657 r = fw3_ipt_rule_new(handle);
658
659 snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
660 fw3_flag_names[t], zone->name);
661
662 fw3_ipt_rule_limit(r, &zone->log_limit);
663 fw3_ipt_rule_target(r, "LOG");
664 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
665 fw3_ipt_rule_append(r, "zone_%s_dest_%s",
666 zone->name, fw3_flag_names[t]);
667 }
668 }
669 }
670 break;
671
672 case FW3_TABLE_NAT:
673 if (zone->masq && handle->family == FW3_FAMILY_V4)
674 {
675 /* for any negated masq_src ip, emit -s addr -j RETURN rules */
676 for (msrc = NULL;
677 (msrc = next_addr(msrc, &zone->masq_src,
678 handle->family, true)) != NULL; )
679 {
680 msrc->invert = false;
681 r = fw3_ipt_rule_new(handle);
682 fw3_ipt_rule_src_dest(r, msrc, NULL);
683 fw3_ipt_rule_target(r, "RETURN");
684 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
685 msrc->invert = true;
686 }
687
688 /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
689 for (mdest = NULL;
690 (mdest = next_addr(mdest, &zone->masq_dest,
691 handle->family, true)) != NULL; )
692 {
693 mdest->invert = false;
694 r = fw3_ipt_rule_new(handle);
695 fw3_ipt_rule_src_dest(r, NULL, mdest);
696 fw3_ipt_rule_target(r, "RETURN");
697 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
698 mdest->invert = true;
699 }
700
701 /* emit masquerading entries for non-negated addresses
702 and ensure that both src and dest loops run at least once,
703 even if there are no relevant addresses */
704 for (first_src = true, msrc = NULL;
705 (msrc = next_addr(msrc, &zone->masq_src,
706 handle->family, false)) || first_src;
707 first_src = false)
708 {
709 for (first_dest = true, mdest = NULL;
710 (mdest = next_addr(mdest, &zone->masq_dest,
711 handle->family, false)) || first_dest;
712 first_dest = false)
713 {
714 r = fw3_ipt_rule_new(handle);
715 fw3_ipt_rule_src_dest(r, msrc, mdest);
716 fw3_ipt_rule_target(r, "MASQUERADE");
717 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
718 }
719 }
720 }
721 break;
722
723 case FW3_TABLE_RAW:
724 fw3_print_cthelpers(handle, state, zone);
725 break;
726
727 case FW3_TABLE_MANGLE:
728 break;
729 }
730
731 print_interface_rules(handle, state, reload, zone);
732 }
733
734 void
735 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
736 bool reload)
737 {
738 struct fw3_zone *zone;
739
740 list_for_each_entry(zone, &state->zones, list)
741 print_zone_chain(handle, state, reload, zone);
742 }
743
744 void
745 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
746 bool reload)
747 {
748 struct fw3_zone *zone;
749
750 list_for_each_entry(zone, &state->zones, list)
751 print_zone_rule(handle, state, reload, zone);
752 }
753
754 void
755 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
756 bool reload)
757 {
758 struct fw3_zone *z, *tmp;
759 const struct fw3_chain_spec *c;
760 char chain[32];
761
762 list_for_each_entry_safe(z, tmp, &state->zones, list)
763 {
764 if (!has(z->flags, handle->family, handle->table))
765 continue;
766
767 for (c = zone_chains; c->format; c++)
768 {
769 /* don't touch user chains on selective stop */
770 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
771 continue;
772
773 if (!fw3_is_family(c, handle->family))
774 continue;
775
776 if (c->table != handle->table)
777 continue;
778
779 if (c->flag && !has(z->flags, handle->family, c->flag))
780 continue;
781
782 snprintf(chain, sizeof(chain), c->format, z->name);
783 fw3_ipt_flush_chain(handle, chain);
784
785 /* keep certain basic chains that do not depend on any settings to
786 avoid purging unrelated user rules pointing to them */
787 if (reload && !c->flag)
788 continue;
789
790 fw3_ipt_delete_chain(handle, chain);
791 }
792
793 del(z->flags, handle->family, handle->table);
794 }
795 }
796
797 void
798 fw3_hotplug_zones(struct fw3_state *state, bool add)
799 {
800 struct fw3_zone *z;
801 struct fw3_device *d;
802
803 list_for_each_entry(z, &state->zones, list)
804 {
805 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
806 {
807 list_for_each_entry(d, &z->devices, list)
808 fw3_hotplug(add, z, d);
809
810 if (add)
811 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
812 else
813 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
814 }
815 }
816 }
817
818 struct fw3_zone *
819 fw3_lookup_zone(struct fw3_state *state, const char *name)
820 {
821 struct fw3_zone *z;
822
823 if (list_empty(&state->zones))
824 return NULL;
825
826 list_for_each_entry(z, &state->zones, list)
827 {
828 if (strcmp(z->name, name))
829 continue;
830
831 return z;
832 }
833
834 return NULL;
835 }
836
837 struct list_head *
838 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
839 {
840 struct fw3_device *net;
841 struct fw3_address *cur, *tmp;
842 struct list_head *all;
843
844 all = calloc(1, sizeof(*all));
845 if (!all)
846 return NULL;
847
848 INIT_LIST_HEAD(all);
849
850 if (addr && addr->set)
851 {
852 tmp = malloc(sizeof(*tmp));
853
854 if (tmp)
855 {
856 *tmp = *addr;
857 list_add_tail(&tmp->list, all);
858 }
859 }
860 else
861 {
862 list_for_each_entry(net, &zone->networks, list)
863 fw3_ubus_address(all, net->name);
864
865 list_for_each_entry(cur, &zone->subnets, list)
866 {
867 tmp = malloc(sizeof(*tmp));
868
869 if (!tmp)
870 continue;
871
872 *tmp = *cur;
873 list_add_tail(&tmp->list, all);
874 }
875 }
876
877 return all;
878 }
OpenWrt firewall configuration utility