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, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
  43         C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
  44         C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
  45
  46         C(V4,  NAT,    CUSTOM_CHAINS, "prerouting_%s_rule"),
  47         C(V4,  NAT,    CUSTOM_CHAINS, "postrouting_%s_rule"),
  48
  49         { }
  50 };
  51
  52 const struct fw3_option fw3_zone_opts[] = {
  53         FW3_OPT("enabled",             bool,     zone,     enabled),
  54
  55         FW3_OPT("name",                string,   zone,     name),
  56         FW3_OPT("family",              family,   zone,     family),
  57
  58         FW3_LIST("network",            device,   zone,     networks),
  59         FW3_LIST("device",             device,   zone,     devices),
  60         FW3_LIST("subnet",             network,  zone,     subnets),
  61
  62         FW3_OPT("input",               target,   zone,     policy_input),
  63         FW3_OPT("forward",             target,   zone,     policy_forward),
  64         FW3_OPT("output",              target,   zone,     policy_output),
  65
  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),
  69
  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),
  73
  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),
  77
  78         FW3_OPT("log",                 bool,     zone,     log),
  79         FW3_OPT("log_limit",           limit,    zone,     log_limit),
  80
  81         FW3_OPT("__flags_v4",          int,      zone,     flags[0]),
  82         FW3_OPT("__flags_v6",          int,      zone,     flags[1]),
  83
  84         { }
  85 };
  86
  87
  88 static void
  89 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
  90              const char *name)
  91 {
  92         if (*pol == FW3_FLAG_UNSPEC)
  93         {
  94                 warn_elem(e, "has no %s policy specified, using default", name);
  95                 *pol = def;
  96         }
  97         else if (*pol > FW3_FLAG_DROP)
  98         {
  99                 warn_elem(e, "has invalid %s policy, using default", name);
 100                 *pol = def;
 101         }
 102 }
 103
 104 static void
 105 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
 106 {
 107         struct fw3_device *net, *tmp;
 108
 109         list_for_each_entry(net, &zone->networks, list)
 110         {
 111                 tmp = fw3_ubus_device(net->name);
 112
 113                 if (!tmp)
 114                 {
 115                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
 116                         continue;
 117                 }
 118
 119                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
 120                 list_add_tail(&tmp->list, &zone->devices);
 121         }
 122 }
 123
 124 struct fw3_zone *
 125 fw3_alloc_zone(void)
 126 {
 127         struct fw3_zone *zone;
 128
 129         zone = malloc(sizeof(*zone));
 130
 131         if (!zone)
 132                 return NULL;
 133
 134         memset(zone, 0, sizeof(*zone));
 135
 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);
 141
 142         zone->enabled = true;
 143         zone->custom_chains = true;
 144         zone->log_limit.rate = 10;
 145
 146         return zone;
 147 }
 148
 149 void
 150 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
 151 {
 152         struct uci_section *s;
 153         struct uci_element *e;
 154         struct fw3_zone *zone;
 155         struct fw3_defaults *defs = &state->defaults;
 156
 157         INIT_LIST_HEAD(&state->zones);
 158
 159         uci_foreach_element(&p->sections, e)
 160         {
 161                 s = uci_to_section(e);
 162
 163                 if (strcmp(s->type, "zone"))
 164                         continue;
 165
 166                 zone = fw3_alloc_zone();
 167
 168                 if (!zone)
 169                         continue;
 170
 171                 fw3_parse_options(zone, fw3_zone_opts, s);
 172
 173                 if (!zone->enabled)
 174                 {
 175                         fw3_free_zone(zone);
 176                         continue;
 177                 }
 178
 179                 if (!zone->extra_dest)
 180                         zone->extra_dest = zone->extra_src;
 181
 182                 if (!defs->custom_chains && zone->custom_chains)
 183                         zone->custom_chains = false;
 184
 185                 if (!zone->name || !*zone->name)
 186                 {
 187                         warn_elem(e, "has no name - ignoring");
 188                         fw3_free_zone(zone);
 189                         continue;
 190                 }
 191
 192                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
 193                 {
 194                         warn_elem(e, "must not have a name longer than %u characters",
 195                                      FW3_ZONE_MAXNAMELEN);
 196                         fw3_free_zone(zone);
 197                         continue;
 198                 }
 199
 200                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 201                     list_empty(&zone->subnets) && !zone->extra_src)
 202                 {
 203                         warn_elem(e, "has no device, network, subnet or extra options");
 204                 }
 205
 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");
 209
 210                 resolve_networks(e, zone);
 211
 212                 if (zone->masq)
 213                 {
 214                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 215                         zone->conntrack = true;
 216                 }
 217
 218                 if (zone->custom_chains)
 219                 {
 220                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 221                         setbit(zone->flags[0], FW3_FLAG_DNAT);
 222                 }
 223
 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);
 227
 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);
 231
 232                 list_add_tail(&zone->list, &state->zones);
 233         }
 234 }
 235
 236
 237 static void
 238 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 239                  bool reload, struct fw3_zone *zone)
 240 {
 241         int i;
 242         struct fw3_ipt_rule *r;
 243         const struct fw3_chain_spec *c;
 244
 245         const char *flt_chains[] = {
 246                 "input",   "input",
 247                 "output",  "output",
 248                 "forward", "forwarding",
 249         };
 250
 251         const char *nat_chains[] = {
 252                 "prerouting",  "prerouting",
 253                 "postrouting", "postrouting",
 254         };
 255
 256         if (!fw3_is_family(zone, handle->family))
 257                 return;
 258
 259         info("   * Zone '%s'", zone->name);
 260
 261         set(zone->flags, handle->family, handle->table);
 262
 263         if (zone->custom_chains)
 264                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 265
 266         if (!zone->conntrack && !state->defaults.drop_invalid)
 267                 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
 268
 269         for (c = zone_chains; c->format; c++)
 270         {
 271                 /* don't touch user chains on selective stop */
 272                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 273                         continue;
 274
 275                 if (!fw3_is_family(c, handle->family))
 276                         continue;
 277
 278                 if (c->table != handle->table)
 279                         continue;
 280
 281                 if (c->flag &&
 282                     !hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 283                         continue;
 284
 285                 fw3_ipt_create_chain(handle, c->format, zone->name);
 286         }
 287
 288         if (zone->custom_chains)
 289         {
 290                 if (handle->table == FW3_TABLE_FILTER)
 291                 {
 292                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 293                         {
 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]);
 298                         }
 299                 }
 300                 else if (handle->table == FW3_TABLE_NAT)
 301                 {
 302                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 303                         {
 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]);
 308                         }
 309                 }
 310         }
 311
 312         set(zone->flags, handle->family, handle->table);
 313 }
 314
 315 static void
 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)
 319 {
 320         bool disable_notrack = state->defaults.drop_invalid;
 321         struct fw3_protocol tcp = { .protocol = 6 };
 322         struct fw3_ipt_rule *r;
 323         enum fw3_flag t;
 324
 325         char buf[32];
 326
 327         int i;
 328
 329         const char *chains[] = {
 330                 "input",
 331                 "output",
 332                 "forward",
 333         };
 334
 335 #define jump_target(t) \
 336         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 337
 338         if (handle->table == FW3_TABLE_FILTER)
 339         {
 340                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 341                 {
 342                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 343                         {
 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,
 348                                                     fw3_flag_names[t]);
 349                         }
 350
 351                         if (has(zone->flags, handle->family, t))
 352                         {
 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,
 357                                                     fw3_flag_names[t]);
 358                         }
 359                 }
 360
 361                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i++)
 362                 {
 363                         if (*chains[i] == 'o')
 364                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 365                         else
 366                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 367
 368                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 369
 370                         if (*chains[i] == 'o')
 371                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 372                         else
 373                                 fw3_ipt_rule_extra(r, zone->extra_src);
 374
 375                         fw3_ipt_rule_append(r, "delegate_%s", chains[i]);
 376                 }
 377         }
 378         else if (handle->table == FW3_TABLE_NAT)
 379         {
 380                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 381                 {
 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");
 386                 }
 387
 388                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 389                 {
 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");
 394                 }
 395         }
 396         else if (handle->table == FW3_TABLE_MANGLE)
 397         {
 398                 if (zone->mtu_fix)
 399                 {
 400                         if (zone->log)
 401                         {
 402                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 403
 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");
 412                         }
 413
 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");
 421                 }
 422         }
 423         else if (handle->table == FW3_TABLE_RAW)
 424         {
 425                 if (!zone->conntrack && !disable_notrack)
 426                 {
 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");
 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         struct fw3_address *msrc;
 461         struct fw3_address *mdest;
 462         struct fw3_ipt_rule *r;
 463
 464         enum fw3_flag t;
 465         char buf[32];
 466
 467         if (!fw3_is_family(zone, handle->family))
 468                 return;
 469
 470         switch (handle->table)
 471         {
 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);
 477
 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);
 482
 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);
 487
 488                 if (zone->log)
 489                 {
 490                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 491                         {
 492                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 493                                 {
 494                                         r = fw3_ipt_rule_new(handle);
 495
 496                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 497                                                  fw3_flag_names[t], zone->name);
 498
 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]);
 504                                 }
 505
 506                                 if (has(zone->flags, handle->family, t))
 507                                 {
 508                                         r = fw3_ipt_rule_new(handle);
 509
 510                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 511                                                  fw3_flag_names[t], zone->name);
 512
 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]);
 518                                 }
 519                         }
 520                 }
 521                 break;
 522
 523         case FW3_TABLE_NAT:
 524                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 525                 {
 526                         fw3_foreach(msrc, &zone->masq_src)
 527                         fw3_foreach(mdest, &zone->masq_dest)
 528                         {
 529                                 if (!fw3_is_family(msrc, handle->family) ||
 530                                     !fw3_is_family(mdest, handle->family))
 531                                         continue;
 532
 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);
 537                         }
 538                 }
 539                 break;
 540
 541         case FW3_TABLE_RAW:
 542         case FW3_TABLE_MANGLE:
 543                 break;
 544         }
 545
 546         print_interface_rules(handle, state, reload, zone);
 547 }
 548
 549 void
 550 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 551                       bool reload)
 552 {
 553         struct fw3_zone *zone;
 554
 555         list_for_each_entry(zone, &state->zones, list)
 556                 print_zone_chain(handle, state, reload, zone);
 557 }
 558
 559 void
 560 fw3_print_zone_rules(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_rule(handle, state, reload, zone);
 567 }
 568
 569 void
 570 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 571                 bool reload)
 572 {
 573         struct fw3_zone *z, *tmp;
 574         const struct fw3_chain_spec *c;
 575         char chain[32];
 576
 577         list_for_each_entry_safe(z, tmp, &state->zones, list)
 578         {
 579                 if (!has(z->flags, handle->family, handle->table))
 580                         continue;
 581
 582                 for (c = zone_chains; c->format; c++)
 583                 {
 584                         /* don't touch user chains on selective stop */
 585                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 586                                 continue;
 587
 588                         if (!fw3_is_family(c, handle->family))
 589                                 continue;
 590
 591                         if (c->table != handle->table)
 592                                 continue;
 593
 594                         if (c->flag && !has(z->flags, handle->family, c->flag))
 595                                 continue;
 596
 597                         snprintf(chain, sizeof(chain), c->format, z->name);
 598                         fw3_ipt_flush_chain(handle, chain);
 599
 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)
 603                                 continue;
 604
 605                         fw3_ipt_delete_chain(handle, chain);
 606                 }
 607
 608                 del(z->flags, handle->family, handle->table);
 609         }
 610 }
 611
 612 void
 613 fw3_hotplug_zones(struct fw3_state *state, bool add)
 614 {
 615         struct fw3_zone *z;
 616         struct fw3_device *d;
 617
 618         list_for_each_entry(z, &state->zones, list)
 619         {
 620                 if (add != hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 621                 {
 622                         list_for_each_entry(d, &z->devices, list)
 623                                 fw3_hotplug(add, z, d);
 624
 625                         if (add)
 626                                 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 627                         else
 628                                 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 629                 }
 630         }
 631 }
 632
 633 struct fw3_zone *
 634 fw3_lookup_zone(struct fw3_state *state, const char *name)
 635 {
 636         struct fw3_zone *z;
 637
 638         if (list_empty(&state->zones))
 639                 return NULL;
 640
 641         list_for_each_entry(z, &state->zones, list)
 642         {
 643                 if (strcmp(z->name, name))
 644                         continue;
 645
 646                 return z;
 647         }
 648
 649         return NULL;
 650 }
 651
 652 struct list_head *
 653 fw3_resolve_zone_addresses(struct fw3_zone *zone)
 654 {
 655         struct fw3_device *net;
 656         struct fw3_address *addr, *tmp;
 657         struct list_head *addrs, *all;
 658
 659         all = malloc(sizeof(*all));
 660
 661         if (!all)
 662                 return NULL;
 663
 664         memset(all, 0, sizeof(*all));
 665         INIT_LIST_HEAD(all);
 666
 667         list_for_each_entry(net, &zone->networks, list)
 668         {
 669                 addrs = fw3_ubus_address(net->name);
 670
 671                 if (!addrs)
 672                         continue;
 673
 674                 list_for_each_entry_safe(addr, tmp, addrs, list)
 675                 {
 676                         list_del(&addr->list);
 677                         list_add_tail(&addr->list, all);
 678                 }
 679
 680                 free(addrs);
 681         }
 682
 683         list_for_each_entry(addr, &zone->subnets, list)
 684         {
 685                 tmp = malloc(sizeof(*tmp));
 686
 687                 if (!tmp)
 688                         continue;
 689
 690                 memcpy(tmp, addr, sizeof(*tmp));
 691                 list_add_tail(&tmp->list, all);
 692         }
 693
 694         return all;
 695 }