utils: define _GNU_SOURCE to get clearenv()
[project/firewall3.git] / zones.c
1 /*
2  * firewall3 - 3rd OpenWrt UCI firewall implementation
3  *
4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
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
22
23 #define C(f, tbl, tgt, fmt) \
24         { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
25
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"),
30
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"),
34
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"),
38
39         C(V4,  NAT,    SNAT,          "zone_%s_postrouting"),
40         C(V4,  NAT,    DNAT,          "zone_%s_prerouting"),
41
42         C(ANY, RAW,    NOTRACK,       "zone_%s_notrack"),
43
44         C(ANY, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
45         C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
46         C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
47
48         C(V4,  NAT,    CUSTOM_CHAINS, "prerouting_%s_rule"),
49         C(V4,  NAT,    CUSTOM_CHAINS, "postrouting_%s_rule"),
50
51         { }
52 };
53
54 const struct fw3_option fw3_zone_opts[] = {
55         FW3_OPT("enabled",             bool,     zone,     enabled),
56
57         FW3_OPT("name",                string,   zone,     name),
58         FW3_OPT("family",              family,   zone,     family),
59
60         FW3_LIST("network",            device,   zone,     networks),
61         FW3_LIST("device",             device,   zone,     devices),
62         FW3_LIST("subnet",             network,  zone,     subnets),
63
64         FW3_OPT("input",               target,   zone,     policy_input),
65         FW3_OPT("forward",             target,   zone,     policy_forward),
66         FW3_OPT("output",              target,   zone,     policy_output),
67
68         FW3_OPT("masq",                bool,     zone,     masq),
69         FW3_LIST("masq_src",           network,  zone,     masq_src),
70         FW3_LIST("masq_dest",          network,  zone,     masq_dest),
71
72         FW3_OPT("extra",               string,   zone,     extra_src),
73         FW3_OPT("extra_src",           string,   zone,     extra_src),
74         FW3_OPT("extra_dest",          string,   zone,     extra_dest),
75
76         FW3_OPT("conntrack",           bool,     zone,     conntrack),
77         FW3_OPT("mtu_fix",             bool,     zone,     mtu_fix),
78         FW3_OPT("custom_chains",       bool,     zone,     custom_chains),
79
80         FW3_OPT("log",                 bool,     zone,     log),
81         FW3_OPT("log_limit",           limit,    zone,     log_limit),
82
83         FW3_OPT("__flags_v4",          int,      zone,     flags[0]),
84         FW3_OPT("__flags_v6",          int,      zone,     flags[1]),
85
86         { }
87 };
88
89
90 static void
91 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
92              const char *name)
93 {
94         if (*pol == FW3_FLAG_UNSPEC)
95         {
96                 warn_elem(e, "has no %s policy specified, using default", name);
97                 *pol = def;
98         }
99         else if (*pol > FW3_FLAG_DROP)
100         {
101                 warn_elem(e, "has invalid %s policy, using default", name);
102                 *pol = def;
103         }
104 }
105
106 static void
107 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
108 {
109         struct fw3_device *net, *tmp;
110
111         list_for_each_entry(net, &zone->networks, list)
112         {
113                 tmp = fw3_ubus_device(net->name);
114
115                 if (!tmp)
116                 {
117                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
118                         continue;
119                 }
120
121                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
122                 list_add_tail(&tmp->list, &zone->devices);
123         }
124 }
125
126 struct fw3_zone *
127 fw3_alloc_zone(void)
128 {
129         struct fw3_zone *zone;
130
131         zone = malloc(sizeof(*zone));
132
133         if (!zone)
134                 return NULL;
135
136         memset(zone, 0, sizeof(*zone));
137
138         INIT_LIST_HEAD(&zone->networks);
139         INIT_LIST_HEAD(&zone->devices);
140         INIT_LIST_HEAD(&zone->subnets);
141         INIT_LIST_HEAD(&zone->masq_src);
142         INIT_LIST_HEAD(&zone->masq_dest);
143
144         zone->enabled = true;
145         zone->custom_chains = true;
146         zone->log_limit.rate = 10;
147
148         return zone;
149 }
150
151 void
152 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
153 {
154         struct uci_section *s;
155         struct uci_element *e;
156         struct fw3_zone *zone;
157         struct fw3_defaults *defs = &state->defaults;
158
159         INIT_LIST_HEAD(&state->zones);
160
161         uci_foreach_element(&p->sections, e)
162         {
163                 s = uci_to_section(e);
164
165                 if (strcmp(s->type, "zone"))
166                         continue;
167
168                 zone = fw3_alloc_zone();
169
170                 if (!zone)
171                         continue;
172
173                 fw3_parse_options(zone, fw3_zone_opts, s);
174
175                 if (!zone->enabled)
176                 {
177                         fw3_free_zone(zone);
178                         continue;
179                 }
180
181                 if (!zone->extra_dest)
182                         zone->extra_dest = zone->extra_src;
183
184                 if (!defs->custom_chains && zone->custom_chains)
185                         zone->custom_chains = false;
186
187                 if (!zone->name || !*zone->name)
188                 {
189                         warn_elem(e, "has no name - ignoring");
190                         fw3_free_zone(zone);
191                         continue;
192                 }
193
194                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
195                 {
196                         warn_elem(e, "must not have a name longer than %u characters",
197                                      FW3_ZONE_MAXNAMELEN);
198                         fw3_free_zone(zone);
199                         continue;
200                 }
201
202                 fw3_ubus_zone_devices(zone);
203
204                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
205                     list_empty(&zone->subnets) && !zone->extra_src)
206                 {
207                         warn_elem(e, "has no device, network, subnet or extra options");
208                 }
209
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");
213
214                 resolve_networks(e, zone);
215
216                 if (zone->masq)
217                 {
218                         setbit(zone->flags[0], FW3_FLAG_SNAT);
219                         zone->conntrack = true;
220                 }
221
222                 if (zone->custom_chains)
223                 {
224                         setbit(zone->flags[0], FW3_FLAG_SNAT);
225                         setbit(zone->flags[0], FW3_FLAG_DNAT);
226                 }
227
228                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
229                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_forward));
230                 setbit(zone->flags[0], zone->policy_output);
231
232                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
233                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_forward));
234                 setbit(zone->flags[1], zone->policy_output);
235
236                 list_add_tail(&zone->list, &state->zones);
237         }
238 }
239
240
241 static void
242 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
243                  bool reload, struct fw3_zone *zone)
244 {
245         int i;
246         struct fw3_ipt_rule *r;
247         const struct fw3_chain_spec *c;
248
249         const char *flt_chains[] = {
250                 "input",   "input",
251                 "output",  "output",
252                 "forward", "forwarding",
253         };
254
255         const char *nat_chains[] = {
256                 "prerouting",  "prerouting",
257                 "postrouting", "postrouting",
258         };
259
260         if (!fw3_is_family(zone, handle->family))
261                 return;
262
263         info("   * Zone '%s'", zone->name);
264
265         set(zone->flags, handle->family, handle->table);
266
267         if (zone->custom_chains)
268                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
269
270         if (!zone->conntrack && !state->defaults.drop_invalid)
271                 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
272
273         for (c = zone_chains; c->format; c++)
274         {
275                 /* don't touch user chains on selective stop */
276                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
277                         continue;
278
279                 if (!fw3_is_family(c, handle->family))
280                         continue;
281
282                 if (c->table != handle->table)
283                         continue;
284
285                 if (c->flag &&
286                     !hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
287                         continue;
288
289                 fw3_ipt_create_chain(handle, c->format, zone->name);
290         }
291
292         if (zone->custom_chains)
293         {
294                 if (handle->table == FW3_TABLE_FILTER)
295                 {
296                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
297                         {
298                                 r = fw3_ipt_rule_new(handle);
299                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
300                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
301                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
302                         }
303                 }
304                 else if (handle->table == FW3_TABLE_NAT)
305                 {
306                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
307                         {
308                                 r = fw3_ipt_rule_new(handle);
309                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
310                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
311                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
312                         }
313                 }
314         }
315
316         set(zone->flags, handle->family, handle->table);
317 }
318
319 static void
320 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
321                                          bool reload, struct fw3_zone *zone,
322                      struct fw3_device *dev, struct fw3_address *sub)
323 {
324         struct fw3_protocol tcp = { .protocol = 6 };
325         struct fw3_ipt_rule *r;
326         enum fw3_flag t;
327
328         char buf[32];
329
330         int i;
331
332         const char *chains[] = {
333                 "input",
334                 "output",
335                 "forward",
336         };
337
338 #define jump_target(t) \
339         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
340
341         if (handle->table == FW3_TABLE_FILTER)
342         {
343                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
344                 {
345                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
346                         {
347                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
348                                 fw3_ipt_rule_target(r, jump_target(t));
349                                 fw3_ipt_rule_extra(r, zone->extra_src);
350                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
351                                                      fw3_flag_names[t]);
352                         }
353
354                         if (has(zone->flags, handle->family, t))
355                         {
356                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
357                                 fw3_ipt_rule_target(r, jump_target(t));
358                                 fw3_ipt_rule_extra(r, zone->extra_dest);
359                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
360                                                      fw3_flag_names[t]);
361                         }
362                 }
363
364                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i++)
365                 {
366                         if (*chains[i] == 'o')
367                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
368                         else
369                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
370
371                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
372
373                         if (*chains[i] == 'o')
374                                 fw3_ipt_rule_extra(r, zone->extra_dest);
375                         else
376                                 fw3_ipt_rule_extra(r, zone->extra_src);
377
378                         fw3_ipt_rule_replace(r, "delegate_%s", chains[i]);
379                 }
380         }
381         else if (handle->table == FW3_TABLE_NAT)
382         {
383                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
384                 {
385                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
386                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
387                         fw3_ipt_rule_extra(r, zone->extra_src);
388                         fw3_ipt_rule_replace(r, "delegate_prerouting");
389                 }
390
391                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
392                 {
393                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
394                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
395                         fw3_ipt_rule_extra(r, zone->extra_dest);
396                         fw3_ipt_rule_replace(r, "delegate_postrouting");
397                 }
398         }
399         else if (handle->table == FW3_TABLE_MANGLE)
400         {
401                 if (zone->mtu_fix)
402                 {
403                         if (zone->log)
404                         {
405                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
406
407                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
408                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
409                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
410                                 fw3_ipt_rule_limit(r, &zone->log_limit);
411                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
412                                 fw3_ipt_rule_target(r, "LOG");
413                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
414                                 fw3_ipt_rule_replace(r, "mssfix");
415                         }
416
417                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
418                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
419                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
420                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
421                         fw3_ipt_rule_target(r, "TCPMSS");
422                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
423                         fw3_ipt_rule_replace(r, "mssfix");
424                 }
425         }
426         else if (handle->table == FW3_TABLE_RAW)
427         {
428                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
429                 {
430                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
431                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
432                         fw3_ipt_rule_extra(r, zone->extra_src);
433                         fw3_ipt_rule_replace(r, "delegate_notrack");
434                 }
435         }
436 }
437
438 static void
439 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
440                       bool reload, struct fw3_zone *zone)
441 {
442         struct fw3_device *dev;
443         struct fw3_address *sub;
444
445         fw3_foreach(dev, &zone->devices)
446         fw3_foreach(sub, &zone->subnets)
447         {
448                 if (!fw3_is_family(sub, handle->family))
449                         continue;
450
451                 if (!dev && !sub)
452                         continue;
453
454                 print_interface_rule(handle, state, reload, zone, dev, sub);
455         }
456 }
457
458 static void
459 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
460                 bool reload, struct fw3_zone *zone)
461 {
462         bool disable_notrack = state->defaults.drop_invalid;
463         struct fw3_address *msrc;
464         struct fw3_address *mdest;
465         struct fw3_ipt_rule *r;
466
467         enum fw3_flag t;
468         char buf[32];
469
470         if (!fw3_is_family(zone, handle->family))
471                 return;
472
473         switch (handle->table)
474         {
475         case FW3_TABLE_FILTER:
476                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
477                 {
478                         r = fw3_ipt_rule_new(handle);
479                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
480                         fw3_ipt_rule_comment(r, "Accept port redirections");
481                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
482                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
483
484                         r = fw3_ipt_rule_new(handle);
485                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
486                         fw3_ipt_rule_comment(r, "Accept port forwards");
487                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
488                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
489                 }
490
491                 r = fw3_ipt_rule_new(handle);
492                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
493                                      fw3_flag_names[zone->policy_input]);
494                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
495
496                 r = fw3_ipt_rule_new(handle);
497                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
498                                      fw3_flag_names[zone->policy_forward]);
499                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
500
501                 r = fw3_ipt_rule_new(handle);
502                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
503                                      fw3_flag_names[zone->policy_output]);
504                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
505
506                 if (zone->log)
507                 {
508                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
509                         {
510                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
511                                 {
512                                         r = fw3_ipt_rule_new(handle);
513
514                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
515                                                  fw3_flag_names[t], zone->name);
516
517                                         fw3_ipt_rule_limit(r, &zone->log_limit);
518                                         fw3_ipt_rule_target(r, "LOG");
519                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
520                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
521                                                             zone->name, fw3_flag_names[t]);
522                                 }
523
524                                 if (has(zone->flags, handle->family, t))
525                                 {
526                                         r = fw3_ipt_rule_new(handle);
527
528                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
529                                                  fw3_flag_names[t], zone->name);
530
531                                         fw3_ipt_rule_limit(r, &zone->log_limit);
532                                         fw3_ipt_rule_target(r, "LOG");
533                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
534                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
535                                                             zone->name, fw3_flag_names[t]);
536                                 }
537                         }
538                 }
539                 break;
540
541         case FW3_TABLE_NAT:
542                 if (zone->masq && handle->family == FW3_FAMILY_V4)
543                 {
544                         fw3_foreach(msrc, &zone->masq_src)
545                         fw3_foreach(mdest, &zone->masq_dest)
546                         {
547                                 if (!fw3_is_family(msrc, handle->family) ||
548                                     !fw3_is_family(mdest, handle->family))
549                                         continue;
550
551                                 r = fw3_ipt_rule_new(handle);
552                                 fw3_ipt_rule_src_dest(r, msrc, mdest);
553                                 fw3_ipt_rule_target(r, "MASQUERADE");
554                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
555                         }
556                 }
557                 break;
558
559         case FW3_TABLE_RAW:
560                 if (!zone->conntrack && !disable_notrack)
561                 {
562                         r = fw3_ipt_rule_new(handle);
563                         fw3_ipt_rule_target(r, "CT");
564                         fw3_ipt_rule_addarg(r, false, "--notrack", NULL);
565                         fw3_ipt_rule_append(r, "zone_%s_notrack", zone->name);
566                 }
567                 break;
568
569         case FW3_TABLE_MANGLE:
570                 break;
571         }
572
573         print_interface_rules(handle, state, reload, zone);
574 }
575
576 void
577 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
578                       bool reload)
579 {
580         struct fw3_zone *zone;
581
582         list_for_each_entry(zone, &state->zones, list)
583                 print_zone_chain(handle, state, reload, zone);
584 }
585
586 void
587 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
588                      bool reload)
589 {
590         struct fw3_zone *zone;
591
592         list_for_each_entry(zone, &state->zones, list)
593                 print_zone_rule(handle, state, reload, zone);
594 }
595
596 void
597 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
598                 bool reload)
599 {
600         struct fw3_zone *z, *tmp;
601         const struct fw3_chain_spec *c;
602         char chain[32];
603
604         list_for_each_entry_safe(z, tmp, &state->zones, list)
605         {
606                 if (!has(z->flags, handle->family, handle->table))
607                         continue;
608
609                 for (c = zone_chains; c->format; c++)
610                 {
611                         /* don't touch user chains on selective stop */
612                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
613                                 continue;
614
615                         if (!fw3_is_family(c, handle->family))
616                                 continue;
617
618                         if (c->table != handle->table)
619                                 continue;
620
621                         if (c->flag && !has(z->flags, handle->family, c->flag))
622                                 continue;
623
624                         snprintf(chain, sizeof(chain), c->format, z->name);
625                         fw3_ipt_flush_chain(handle, chain);
626
627                         /* keep certain basic chains that do not depend on any settings to
628                            avoid purging unrelated user rules pointing to them */
629                         if (reload && !c->flag)
630                                 continue;
631
632                         fw3_ipt_delete_chain(handle, chain);
633                 }
634
635                 del(z->flags, handle->family, handle->table);
636         }
637 }
638
639 void
640 fw3_hotplug_zones(struct fw3_state *state, bool add)
641 {
642         struct fw3_zone *z;
643         struct fw3_device *d;
644
645         list_for_each_entry(z, &state->zones, list)
646         {
647                 if (add != hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
648                 {
649                         list_for_each_entry(d, &z->devices, list)
650                                 fw3_hotplug(add, z, d);
651
652                         if (add)
653                                 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
654                         else
655                                 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
656                 }
657         }
658 }
659
660 struct fw3_zone *
661 fw3_lookup_zone(struct fw3_state *state, const char *name)
662 {
663         struct fw3_zone *z;
664
665         if (list_empty(&state->zones))
666                 return NULL;
667
668         list_for_each_entry(z, &state->zones, list)
669         {
670                 if (strcmp(z->name, name))
671                         continue;
672
673                 return z;
674         }
675
676         return NULL;
677 }
678
679 struct list_head *
680 fw3_resolve_zone_addresses(struct fw3_zone *zone)
681 {
682         struct fw3_device *net;
683         struct fw3_address *addr, *tmp;
684         struct list_head *addrs, *all;
685
686         all = malloc(sizeof(*all));
687
688         if (!all)
689                 return NULL;
690
691         memset(all, 0, sizeof(*all));
692         INIT_LIST_HEAD(all);
693
694         list_for_each_entry(net, &zone->networks, list)
695         {
696                 addrs = fw3_ubus_address(net->name);
697
698                 if (!addrs)
699                         continue;
700
701                 list_for_each_entry_safe(addr, tmp, addrs, list)
702                 {
703                         list_del(&addr->list);
704                         list_add_tail(&addr->list, all);
705                 }
706
707                 free(addrs);
708         }
709
710         list_for_each_entry(addr, &zone->subnets, list)
711         {
712                 tmp = malloc(sizeof(*tmp));
713
714                 if (!tmp)
715                         continue;
716
717                 memcpy(tmp, addr, sizeof(*tmp));
718                 list_add_tail(&tmp->list, all);
719         }
720
721         return all;
722 }