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                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 203                     list_empty(&zone->subnets) && !zone->extra_src)
 204                 {
 205                         warn_elem(e, "has no device, network, subnet or extra options");
 206                 }
 207
 208                 check_policy(e, &zone->policy_input, defs->policy_input, "input");
 209                 check_policy(e, &zone->policy_output, defs->policy_output, "output");
 210                 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
 211
 212                 resolve_networks(e, zone);
 213
 214                 if (zone->masq)
 215                 {
 216                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 217                         zone->conntrack = true;
 218                 }
 219
 220                 if (zone->custom_chains)
 221                 {
 222                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 223                         setbit(zone->flags[0], FW3_FLAG_DNAT);
 224                 }
 225
 226                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 227                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_forward));
 228                 setbit(zone->flags[0], zone->policy_output);
 229
 230                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 231                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_forward));
 232                 setbit(zone->flags[1], zone->policy_output);
 233
 234                 list_add_tail(&zone->list, &state->zones);
 235         }
 236 }
 237
 238
 239 static void
 240 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 241                  bool reload, struct fw3_zone *zone)
 242 {
 243         int i;
 244         struct fw3_ipt_rule *r;
 245         const struct fw3_chain_spec *c;
 246
 247         const char *flt_chains[] = {
 248                 "input",   "input",
 249                 "output",  "output",
 250                 "forward", "forwarding",
 251         };
 252
 253         const char *nat_chains[] = {
 254                 "prerouting",  "prerouting",
 255                 "postrouting", "postrouting",
 256         };
 257
 258         if (!fw3_is_family(zone, handle->family))
 259                 return;
 260
 261         info("   * Zone '%s'", zone->name);
 262
 263         set(zone->flags, handle->family, handle->table);
 264
 265         if (zone->custom_chains)
 266                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 267
 268         if (!zone->conntrack && !state->defaults.drop_invalid)
 269                 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
 270
 271         for (c = zone_chains; c->format; c++)
 272         {
 273                 /* don't touch user chains on selective stop */
 274                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 275                         continue;
 276
 277                 if (!fw3_is_family(c, handle->family))
 278                         continue;
 279
 280                 if (c->table != handle->table)
 281                         continue;
 282
 283                 if (c->flag &&
 284                     !hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 285                         continue;
 286
 287                 fw3_ipt_create_chain(handle, c->format, zone->name);
 288         }
 289
 290         if (zone->custom_chains)
 291         {
 292                 if (handle->table == FW3_TABLE_FILTER)
 293                 {
 294                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 295                         {
 296                                 r = fw3_ipt_rule_new(handle);
 297                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 298                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 299                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 300                         }
 301                 }
 302                 else if (handle->table == FW3_TABLE_NAT)
 303                 {
 304                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 305                         {
 306                                 r = fw3_ipt_rule_new(handle);
 307                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 308                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 309                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 310                         }
 311                 }
 312         }
 313
 314         set(zone->flags, handle->family, handle->table);
 315 }
 316
 317 static void
 318 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 319                                          bool reload, struct fw3_zone *zone,
 320                      struct fw3_device *dev, struct fw3_address *sub)
 321 {
 322         struct fw3_protocol tcp = { .protocol = 6 };
 323         struct fw3_ipt_rule *r;
 324         enum fw3_flag t;
 325
 326         char buf[32];
 327
 328         int i;
 329
 330         const char *chains[] = {
 331                 "input",
 332                 "output",
 333                 "forward",
 334         };
 335
 336 #define jump_target(t) \
 337         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 338
 339         if (handle->table == FW3_TABLE_FILTER)
 340         {
 341                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 342                 {
 343                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 344                         {
 345                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 346                                 fw3_ipt_rule_target(r, jump_target(t));
 347                                 fw3_ipt_rule_extra(r, zone->extra_src);
 348                                 fw3_ipt_rule_append(r, "zone_%s_src_%s", zone->name,
 349                                                     fw3_flag_names[t]);
 350                         }
 351
 352                         if (has(zone->flags, handle->family, t))
 353                         {
 354                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 355                                 fw3_ipt_rule_target(r, jump_target(t));
 356                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 357                                 fw3_ipt_rule_append(r, "zone_%s_dest_%s", zone->name,
 358                                                     fw3_flag_names[t]);
 359                         }
 360                 }
 361
 362                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i++)
 363                 {
 364                         if (*chains[i] == 'o')
 365                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 366                         else
 367                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 368
 369                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 370
 371                         if (*chains[i] == 'o')
 372                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 373                         else
 374                                 fw3_ipt_rule_extra(r, zone->extra_src);
 375
 376                         fw3_ipt_rule_append(r, "delegate_%s", chains[i]);
 377                 }
 378         }
 379         else if (handle->table == FW3_TABLE_NAT)
 380         {
 381                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 382                 {
 383                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 384                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 385                         fw3_ipt_rule_extra(r, zone->extra_src);
 386                         fw3_ipt_rule_append(r, "delegate_prerouting");
 387                 }
 388
 389                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 390                 {
 391                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 392                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 393                         fw3_ipt_rule_extra(r, zone->extra_dest);
 394                         fw3_ipt_rule_append(r, "delegate_postrouting");
 395                 }
 396         }
 397         else if (handle->table == FW3_TABLE_MANGLE)
 398         {
 399                 if (zone->mtu_fix)
 400                 {
 401                         if (zone->log)
 402                         {
 403                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 404
 405                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 406                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 407                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 408                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 409                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 410                                 fw3_ipt_rule_target(r, "LOG");
 411                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 412                                 fw3_ipt_rule_append(r, "mssfix");
 413                         }
 414
 415                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 416                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 417                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 418                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 419                         fw3_ipt_rule_target(r, "TCPMSS");
 420                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 421                         fw3_ipt_rule_append(r, "mssfix");
 422                 }
 423         }
 424         else if (handle->table == FW3_TABLE_RAW)
 425         {
 426                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 427                 {
 428                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 429                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 430                         fw3_ipt_rule_extra(r, zone->extra_src);
 431                         fw3_ipt_rule_append(r, "delegate_notrack");
 432                 }
 433         }
 434 }
 435
 436 static void
 437 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 438                       bool reload, struct fw3_zone *zone)
 439 {
 440         struct fw3_device *dev;
 441         struct fw3_address *sub;
 442
 443         fw3_foreach(dev, &zone->devices)
 444         fw3_foreach(sub, &zone->subnets)
 445         {
 446                 if (!fw3_is_family(sub, handle->family))
 447                         continue;
 448
 449                 if (!dev && !sub)
 450                         continue;
 451
 452                 print_interface_rule(handle, state, reload, zone, dev, sub);
 453         }
 454 }
 455
 456 static void
 457 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 458                 bool reload, struct fw3_zone *zone)
 459 {
 460         bool disable_notrack = state->defaults.drop_invalid;
 461         struct fw3_address *msrc;
 462         struct fw3_address *mdest;
 463         struct fw3_ipt_rule *r;
 464
 465         enum fw3_flag t;
 466         char buf[32];
 467
 468         if (!fw3_is_family(zone, handle->family))
 469                 return;
 470
 471         switch (handle->table)
 472         {
 473         case FW3_TABLE_FILTER:
 474                 r = fw3_ipt_rule_new(handle);
 475                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 476                                      fw3_flag_names[zone->policy_input]);
 477                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 478
 479                 r = fw3_ipt_rule_new(handle);
 480                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 481                                      fw3_flag_names[zone->policy_forward]);
 482                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 483
 484                 r = fw3_ipt_rule_new(handle);
 485                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 486                                      fw3_flag_names[zone->policy_output]);
 487                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 488
 489                 if (zone->log)
 490                 {
 491                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 492                         {
 493                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 494                                 {
 495                                         r = fw3_ipt_rule_new(handle);
 496
 497                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 498                                                  fw3_flag_names[t], zone->name);
 499
 500                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 501                                         fw3_ipt_rule_target(r, "LOG");
 502                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 503                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 504                                                             zone->name, fw3_flag_names[t]);
 505                                 }
 506
 507                                 if (has(zone->flags, handle->family, t))
 508                                 {
 509                                         r = fw3_ipt_rule_new(handle);
 510
 511                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 512                                                  fw3_flag_names[t], zone->name);
 513
 514                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 515                                         fw3_ipt_rule_target(r, "LOG");
 516                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 517                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 518                                                             zone->name, fw3_flag_names[t]);
 519                                 }
 520                         }
 521                 }
 522                 break;
 523
 524         case FW3_TABLE_NAT:
 525                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 526                 {
 527                         fw3_foreach(msrc, &zone->masq_src)
 528                         fw3_foreach(mdest, &zone->masq_dest)
 529                         {
 530                                 if (!fw3_is_family(msrc, handle->family) ||
 531                                     !fw3_is_family(mdest, handle->family))
 532                                         continue;
 533
 534                                 r = fw3_ipt_rule_new(handle);
 535                                 fw3_ipt_rule_src_dest(r, msrc, mdest);
 536                                 fw3_ipt_rule_target(r, "MASQUERADE");
 537                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 538                         }
 539                 }
 540                 break;
 541
 542         case FW3_TABLE_RAW:
 543                 if (!zone->conntrack && !disable_notrack)
 544                 {
 545                         r = fw3_ipt_rule_new(handle);
 546                         fw3_ipt_rule_target(r, "CT");
 547                         fw3_ipt_rule_addarg(r, false, "--notrack", NULL);
 548                         fw3_ipt_rule_append(r, "zone_%s_notrack", zone->name);
 549                 }
 550                 break;
 551
 552         case FW3_TABLE_MANGLE:
 553                 break;
 554         }
 555
 556         print_interface_rules(handle, state, reload, zone);
 557 }
 558
 559 void
 560 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 561                       bool reload)
 562 {
 563         struct fw3_zone *zone;
 564
 565         list_for_each_entry(zone, &state->zones, list)
 566                 print_zone_chain(handle, state, reload, zone);
 567 }
 568
 569 void
 570 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 571                      bool reload)
 572 {
 573         struct fw3_zone *zone;
 574
 575         list_for_each_entry(zone, &state->zones, list)
 576                 print_zone_rule(handle, state, reload, zone);
 577 }
 578
 579 void
 580 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 581                 bool reload)
 582 {
 583         struct fw3_zone *z, *tmp;
 584         const struct fw3_chain_spec *c;
 585         char chain[32];
 586
 587         list_for_each_entry_safe(z, tmp, &state->zones, list)
 588         {
 589                 if (!has(z->flags, handle->family, handle->table))
 590                         continue;
 591
 592                 for (c = zone_chains; c->format; c++)
 593                 {
 594                         /* don't touch user chains on selective stop */
 595                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 596                                 continue;
 597
 598                         if (!fw3_is_family(c, handle->family))
 599                                 continue;
 600
 601                         if (c->table != handle->table)
 602                                 continue;
 603
 604                         if (c->flag && !has(z->flags, handle->family, c->flag))
 605                                 continue;
 606
 607                         snprintf(chain, sizeof(chain), c->format, z->name);
 608                         fw3_ipt_flush_chain(handle, chain);
 609
 610                         /* keep certain basic chains that do not depend on any settings to
 611                            avoid purging unrelated user rules pointing to them */
 612                         if (reload && !c->flag)
 613                                 continue;
 614
 615                         fw3_ipt_delete_chain(handle, chain);
 616                 }
 617
 618                 del(z->flags, handle->family, handle->table);
 619         }
 620 }
 621
 622 void
 623 fw3_hotplug_zones(struct fw3_state *state, bool add)
 624 {
 625         struct fw3_zone *z;
 626         struct fw3_device *d;
 627
 628         list_for_each_entry(z, &state->zones, list)
 629         {
 630                 if (add != hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 631                 {
 632                         list_for_each_entry(d, &z->devices, list)
 633                                 fw3_hotplug(add, z, d);
 634
 635                         if (add)
 636                                 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 637                         else
 638                                 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 639                 }
 640         }
 641 }
 642
 643 struct fw3_zone *
 644 fw3_lookup_zone(struct fw3_state *state, const char *name)
 645 {
 646         struct fw3_zone *z;
 647
 648         if (list_empty(&state->zones))
 649                 return NULL;
 650
 651         list_for_each_entry(z, &state->zones, list)
 652         {
 653                 if (strcmp(z->name, name))
 654                         continue;
 655
 656                 return z;
 657         }
 658
 659         return NULL;
 660 }
 661
 662 struct list_head *
 663 fw3_resolve_zone_addresses(struct fw3_zone *zone)
 664 {
 665         struct fw3_device *net;
 666         struct fw3_address *addr, *tmp;
 667         struct list_head *addrs, *all;
 668
 669         all = malloc(sizeof(*all));
 670
 671         if (!all)
 672                 return NULL;
 673
 674         memset(all, 0, sizeof(*all));
 675         INIT_LIST_HEAD(all);
 676
 677         list_for_each_entry(net, &zone->networks, list)
 678         {
 679                 addrs = fw3_ubus_address(net->name);
 680
 681                 if (!addrs)
 682                         continue;
 683
 684                 list_for_each_entry_safe(addr, tmp, addrs, list)
 685                 {
 686                         list_del(&addr->list);
 687                         list_add_tail(&addr->list, all);
 688                 }
 689
 690                 free(addrs);
 691         }
 692
 693         list_for_each_entry(addr, &zone->subnets, list)
 694         {
 695                 tmp = malloc(sizeof(*tmp));
 696
 697                 if (!tmp)
 698                         continue;
 699
 700                 memcpy(tmp, addr, sizeof(*tmp));
 701                 list_add_tail(&tmp->list, all);
 702         }
 703
 704         return all;
 705 }