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 = calloc(1, sizeof(*zone));
 132         if (!zone)
 133                 return NULL;
 134
 135         INIT_LIST_HEAD(&zone->networks);
 136         INIT_LIST_HEAD(&zone->devices);
 137         INIT_LIST_HEAD(&zone->subnets);
 138         INIT_LIST_HEAD(&zone->masq_src);
 139         INIT_LIST_HEAD(&zone->masq_dest);
 140
 141         zone->enabled = true;
 142         zone->custom_chains = true;
 143         zone->log_limit.rate = 10;
 144
 145         return zone;
 146 }
 147
 148 void
 149 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
 150 {
 151         struct uci_section *s;
 152         struct uci_element *e;
 153         struct fw3_zone *zone;
 154         struct fw3_defaults *defs = &state->defaults;
 155
 156         INIT_LIST_HEAD(&state->zones);
 157
 158         uci_foreach_element(&p->sections, e)
 159         {
 160                 s = uci_to_section(e);
 161
 162                 if (strcmp(s->type, "zone"))
 163                         continue;
 164
 165                 zone = fw3_alloc_zone();
 166
 167                 if (!zone)
 168                         continue;
 169
 170                 fw3_parse_options(zone, fw3_zone_opts, s);
 171
 172                 if (!zone->enabled)
 173                 {
 174                         fw3_free_zone(zone);
 175                         continue;
 176                 }
 177
 178                 if (!zone->extra_dest)
 179                         zone->extra_dest = zone->extra_src;
 180
 181                 if (!defs->custom_chains && zone->custom_chains)
 182                         zone->custom_chains = false;
 183
 184                 if (!zone->name || !*zone->name)
 185                 {
 186                         warn_elem(e, "has no name - ignoring");
 187                         fw3_free_zone(zone);
 188                         continue;
 189                 }
 190
 191                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
 192                 {
 193                         warn_elem(e, "must not have a name longer than %u characters",
 194                                      FW3_ZONE_MAXNAMELEN);
 195                         fw3_free_zone(zone);
 196                         continue;
 197                 }
 198
 199                 fw3_ubus_zone_devices(zone);
 200
 201                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 202                     list_empty(&zone->subnets) && !zone->extra_src)
 203                 {
 204                         warn_elem(e, "has no device, network, subnet or extra options");
 205                 }
 206
 207                 check_policy(e, &zone->policy_input, defs->policy_input, "input");
 208                 check_policy(e, &zone->policy_output, defs->policy_output, "output");
 209                 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
 210
 211                 resolve_networks(e, zone);
 212
 213                 if (zone->masq)
 214                 {
 215                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 216                         zone->conntrack = true;
 217                 }
 218
 219                 if (zone->custom_chains)
 220                 {
 221                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 222                         setbit(zone->flags[0], FW3_FLAG_DNAT);
 223                 }
 224
 225                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 226                 setbit(zone->flags[0], zone->policy_forward);
 227                 setbit(zone->flags[0], zone->policy_output);
 228
 229                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 230                 setbit(zone->flags[1], zone->policy_forward);
 231                 setbit(zone->flags[1], zone->policy_output);
 232
 233                 list_add_tail(&zone->list, &state->zones);
 234         }
 235 }
 236
 237
 238 static void
 239 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 240                  bool reload, struct fw3_zone *zone)
 241 {
 242         int i;
 243         struct fw3_ipt_rule *r;
 244         const struct fw3_chain_spec *c;
 245
 246         const char *flt_chains[] = {
 247                 "input",   "input",
 248                 "output",  "output",
 249                 "forward", "forwarding",
 250         };
 251
 252         const char *nat_chains[] = {
 253                 "prerouting",  "prerouting",
 254                 "postrouting", "postrouting",
 255         };
 256
 257         if (!fw3_is_family(zone, handle->family))
 258                 return;
 259
 260         info("   * Zone '%s'", zone->name);
 261
 262         set(zone->flags, handle->family, handle->table);
 263
 264         if (zone->custom_chains)
 265                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 266
 267         if (!zone->conntrack && !state->defaults.drop_invalid)
 268                 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
 269
 270         for (c = zone_chains; c->format; c++)
 271         {
 272                 /* don't touch user chains on selective stop */
 273                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 274                         continue;
 275
 276                 if (!fw3_is_family(c, handle->family))
 277                         continue;
 278
 279                 if (c->table != handle->table)
 280                         continue;
 281
 282                 if (c->flag &&
 283                     !hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 284                         continue;
 285
 286                 fw3_ipt_create_chain(handle, c->format, zone->name);
 287         }
 288
 289         if (zone->custom_chains)
 290         {
 291                 if (handle->table == FW3_TABLE_FILTER)
 292                 {
 293                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 294                         {
 295                                 r = fw3_ipt_rule_new(handle);
 296                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 297                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 298                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 299                         }
 300                 }
 301                 else if (handle->table == FW3_TABLE_NAT)
 302                 {
 303                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 304                         {
 305                                 r = fw3_ipt_rule_new(handle);
 306                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 307                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 308                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 309                         }
 310                 }
 311         }
 312
 313         set(zone->flags, handle->family, handle->table);
 314 }
 315
 316 static void
 317 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 318                                          bool reload, struct fw3_zone *zone,
 319                      struct fw3_device *dev, struct fw3_address *sub)
 320 {
 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_replace(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_replace(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_replace(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_replace(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_replace(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_replace(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_replace(r, "mssfix");
 421                 }
 422         }
 423         else if (handle->table == FW3_TABLE_RAW)
 424         {
 425                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 426                 {
 427                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 428                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 429                         fw3_ipt_rule_extra(r, zone->extra_src);
 430                         fw3_ipt_rule_replace(r, "delegate_notrack");
 431                 }
 432         }
 433 }
 434
 435 static void
 436 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 437                       bool reload, struct fw3_zone *zone)
 438 {
 439         struct fw3_device *dev;
 440         struct fw3_address *sub;
 441
 442         fw3_foreach(dev, &zone->devices)
 443         fw3_foreach(sub, &zone->subnets)
 444         {
 445                 if (!fw3_is_family(sub, handle->family))
 446                         continue;
 447
 448                 if (!dev && !sub)
 449                         continue;
 450
 451                 print_interface_rule(handle, state, reload, zone, dev, sub);
 452         }
 453 }
 454
 455 static void
 456 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 457                 bool reload, struct fw3_zone *zone)
 458 {
 459         bool disable_notrack = state->defaults.drop_invalid;
 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                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 474                 {
 475                         r = fw3_ipt_rule_new(handle);
 476                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 477                         fw3_ipt_rule_comment(r, "Accept port redirections");
 478                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 479                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 480
 481                         r = fw3_ipt_rule_new(handle);
 482                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 483                         fw3_ipt_rule_comment(r, "Accept port forwards");
 484                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 485                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 486                 }
 487
 488                 r = fw3_ipt_rule_new(handle);
 489                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 490                                      fw3_flag_names[zone->policy_input]);
 491                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 492
 493                 r = fw3_ipt_rule_new(handle);
 494                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 495                                      fw3_flag_names[zone->policy_forward]);
 496                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 497
 498                 r = fw3_ipt_rule_new(handle);
 499                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 500                                      fw3_flag_names[zone->policy_output]);
 501                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 502
 503                 if (zone->log)
 504                 {
 505                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 506                         {
 507                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 508                                 {
 509                                         r = fw3_ipt_rule_new(handle);
 510
 511                                         snprintf(buf, sizeof(buf) - 1, "%s(src %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_src_%s",
 518                                                             zone->name, fw3_flag_names[t]);
 519                                 }
 520
 521                                 if (has(zone->flags, handle->family, t))
 522                                 {
 523                                         r = fw3_ipt_rule_new(handle);
 524
 525                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 526                                                  fw3_flag_names[t], zone->name);
 527
 528                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 529                                         fw3_ipt_rule_target(r, "LOG");
 530                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 531                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 532                                                             zone->name, fw3_flag_names[t]);
 533                                 }
 534                         }
 535                 }
 536                 break;
 537
 538         case FW3_TABLE_NAT:
 539                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 540                 {
 541                         fw3_foreach(msrc, &zone->masq_src)
 542                         fw3_foreach(mdest, &zone->masq_dest)
 543                         {
 544                                 if (!fw3_is_family(msrc, handle->family) ||
 545                                     !fw3_is_family(mdest, handle->family))
 546                                         continue;
 547
 548                                 r = fw3_ipt_rule_new(handle);
 549                                 fw3_ipt_rule_src_dest(r, msrc, mdest);
 550                                 fw3_ipt_rule_target(r, "MASQUERADE");
 551                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 552                         }
 553                 }
 554                 break;
 555
 556         case FW3_TABLE_RAW:
 557                 if (!zone->conntrack && !disable_notrack)
 558                 {
 559                         r = fw3_ipt_rule_new(handle);
 560                         fw3_ipt_rule_target(r, "CT");
 561                         fw3_ipt_rule_addarg(r, false, "--notrack", NULL);
 562                         fw3_ipt_rule_append(r, "zone_%s_notrack", zone->name);
 563                 }
 564                 break;
 565
 566         case FW3_TABLE_MANGLE:
 567                 break;
 568         }
 569
 570         print_interface_rules(handle, state, reload, zone);
 571 }
 572
 573 void
 574 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 575                       bool reload)
 576 {
 577         struct fw3_zone *zone;
 578
 579         list_for_each_entry(zone, &state->zones, list)
 580                 print_zone_chain(handle, state, reload, zone);
 581 }
 582
 583 void
 584 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 585                      bool reload)
 586 {
 587         struct fw3_zone *zone;
 588
 589         list_for_each_entry(zone, &state->zones, list)
 590                 print_zone_rule(handle, state, reload, zone);
 591 }
 592
 593 void
 594 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 595                 bool reload)
 596 {
 597         struct fw3_zone *z, *tmp;
 598         const struct fw3_chain_spec *c;
 599         char chain[32];
 600
 601         list_for_each_entry_safe(z, tmp, &state->zones, list)
 602         {
 603                 if (!has(z->flags, handle->family, handle->table))
 604                         continue;
 605
 606                 for (c = zone_chains; c->format; c++)
 607                 {
 608                         /* don't touch user chains on selective stop */
 609                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 610                                 continue;
 611
 612                         if (!fw3_is_family(c, handle->family))
 613                                 continue;
 614
 615                         if (c->table != handle->table)
 616                                 continue;
 617
 618                         if (c->flag && !has(z->flags, handle->family, c->flag))
 619                                 continue;
 620
 621                         snprintf(chain, sizeof(chain), c->format, z->name);
 622                         fw3_ipt_flush_chain(handle, chain);
 623
 624                         /* keep certain basic chains that do not depend on any settings to
 625                            avoid purging unrelated user rules pointing to them */
 626                         if (reload && !c->flag)
 627                                 continue;
 628
 629                         fw3_ipt_delete_chain(handle, chain);
 630                 }
 631
 632                 del(z->flags, handle->family, handle->table);
 633         }
 634 }
 635
 636 void
 637 fw3_hotplug_zones(struct fw3_state *state, bool add)
 638 {
 639         struct fw3_zone *z;
 640         struct fw3_device *d;
 641
 642         list_for_each_entry(z, &state->zones, list)
 643         {
 644                 if (add != hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 645                 {
 646                         list_for_each_entry(d, &z->devices, list)
 647                                 fw3_hotplug(add, z, d);
 648
 649                         if (add)
 650                                 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 651                         else
 652                                 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 653                 }
 654         }
 655 }
 656
 657 struct fw3_zone *
 658 fw3_lookup_zone(struct fw3_state *state, const char *name)
 659 {
 660         struct fw3_zone *z;
 661
 662         if (list_empty(&state->zones))
 663                 return NULL;
 664
 665         list_for_each_entry(z, &state->zones, list)
 666         {
 667                 if (strcmp(z->name, name))
 668                         continue;
 669
 670                 return z;
 671         }
 672
 673         return NULL;
 674 }
 675
 676 struct list_head *
 677 fw3_resolve_zone_addresses(struct fw3_zone *zone)
 678 {
 679         struct fw3_device *net;
 680         struct fw3_address *addr, *tmp;
 681         struct list_head *all;
 682
 683         all = calloc(1, sizeof(*all));
 684         if (!all)
 685                 return NULL;
 686
 687         INIT_LIST_HEAD(all);
 688
 689         list_for_each_entry(net, &zone->networks, list)
 690                 fw3_ubus_address(all, net->name);
 691
 692         list_for_each_entry(addr, &zone->subnets, list)
 693         {
 694                 tmp = malloc(sizeof(*tmp));
 695
 696                 if (!tmp)
 697                         continue;
 698
 699                 memcpy(tmp, addr, sizeof(*tmp));
 700                 list_add_tail(&tmp->list, all);
 701         }
 702
 703         return all;
 704 }