zones.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "zones.h"
  20 #include "ubus.h"
  21
  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("mtu_fix",             bool,     zone,     mtu_fix),
  77         FW3_OPT("custom_chains",       bool,     zone,     custom_chains),
  78
  79         FW3_OPT("log",                 bool,     zone,     log),
  80         FW3_OPT("log_limit",           limit,    zone,     log_limit),
  81
  82         FW3_OPT("__flags_v4",          int,      zone,     flags[0]),
  83         FW3_OPT("__flags_v6",          int,      zone,     flags[1]),
  84
  85         FW3_LIST("__addrs",            address,  zone,     old_addrs),
  86
  87         { }
  88 };
  89
  90
  91 static void
  92 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
  93              const char *name)
  94 {
  95         if (*pol == FW3_FLAG_UNSPEC)
  96         {
  97                 warn_elem(e, "has no %s policy specified, using default", name);
  98                 *pol = def;
  99         }
 100         else if (*pol > FW3_FLAG_DROP)
 101         {
 102                 warn_elem(e, "has invalid %s policy, using default", name);
 103                 *pol = def;
 104         }
 105 }
 106
 107 static void
 108 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
 109 {
 110         struct fw3_device *net, *tmp;
 111
 112         list_for_each_entry(net, &zone->networks, list)
 113         {
 114                 tmp = fw3_ubus_device(net->name);
 115
 116                 if (!tmp)
 117                 {
 118                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
 119                         continue;
 120                 }
 121
 122                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
 123                 list_add_tail(&tmp->list, &zone->devices);
 124         }
 125 }
 126
 127 struct fw3_zone *
 128 fw3_alloc_zone(void)
 129 {
 130         struct fw3_zone *zone;
 131
 132         zone = calloc(1, sizeof(*zone));
 133         if (!zone)
 134                 return NULL;
 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         INIT_LIST_HEAD(&zone->old_addrs);
 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                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 219                 }
 220
 221                 if (zone->custom_chains)
 222                 {
 223                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 224                         fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
 225                 }
 226
 227                 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 228                 fw3_setbit(zone->flags[0], zone->policy_forward);
 229                 fw3_setbit(zone->flags[0], zone->policy_output);
 230
 231                 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 232                 fw3_setbit(zone->flags[1], zone->policy_forward);
 233                 fw3_setbit(zone->flags[1], zone->policy_output);
 234
 235                 list_add_tail(&zone->list, &state->zones);
 236         }
 237 }
 238
 239
 240 static void
 241 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 242                  bool reload, struct fw3_zone *zone)
 243 {
 244         int i;
 245         struct fw3_ipt_rule *r;
 246         const struct fw3_chain_spec *c;
 247
 248         const char *flt_chains[] = {
 249                 "input",   "input",
 250                 "output",  "output",
 251                 "forward", "forwarding",
 252         };
 253
 254         const char *nat_chains[] = {
 255                 "prerouting",  "prerouting",
 256                 "postrouting", "postrouting",
 257         };
 258
 259         if (!fw3_is_family(zone, handle->family))
 260                 return;
 261
 262         info("   * Zone '%s'", zone->name);
 263
 264         set(zone->flags, handle->family, handle->table);
 265
 266         if (zone->custom_chains)
 267                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 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                     !fw3_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         struct fw3_protocol tcp = { .protocol = 6 };
 321         struct fw3_ipt_rule *r;
 322         enum fw3_flag t;
 323
 324         char buf[32];
 325
 326         int i;
 327
 328         const char *chains[] = {
 329                 "input", "INPUT",
 330                 "output", "OUTPUT",
 331                 "forward", "FORWARD",
 332         };
 333
 334 #define jump_target(t) \
 335         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 336
 337         if (handle->table == FW3_TABLE_FILTER)
 338         {
 339                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 340                 {
 341                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 342                         {
 343                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 344                                 fw3_ipt_rule_target(r, jump_target(t));
 345                                 fw3_ipt_rule_extra(r, zone->extra_src);
 346
 347                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 348                                         fw3_ipt_rule_extra(r,
 349                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 350
 351                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 352                                                      fw3_flag_names[t]);
 353                         }
 354
 355                         if (has(zone->flags, handle->family, t))
 356                         {
 357                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 358                                 fw3_ipt_rule_target(r, jump_target(t));
 359                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 360                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 361                                                      fw3_flag_names[t]);
 362                         }
 363                 }
 364
 365                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 366                 {
 367                         if (*chains[i] == 'o')
 368                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 369                         else
 370                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 371
 372                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 373
 374                         if (*chains[i] == 'o')
 375                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 376                         else
 377                                 fw3_ipt_rule_extra(r, zone->extra_src);
 378
 379                         fw3_ipt_rule_replace(r, chains[i + 1]);
 380                 }
 381         }
 382         else if (handle->table == FW3_TABLE_NAT)
 383         {
 384                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 385                 {
 386                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 387                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 388                         fw3_ipt_rule_extra(r, zone->extra_src);
 389                         fw3_ipt_rule_replace(r, "PREROUTING");
 390                 }
 391
 392                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 393                 {
 394                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 395                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 396                         fw3_ipt_rule_extra(r, zone->extra_dest);
 397                         fw3_ipt_rule_replace(r, "POSTROUTING");
 398                 }
 399         }
 400         else if (handle->table == FW3_TABLE_MANGLE)
 401         {
 402                 if (zone->mtu_fix)
 403                 {
 404                         if (zone->log)
 405                         {
 406                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 407
 408                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 409                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 410                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 411                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 412                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 413                                 fw3_ipt_rule_target(r, "LOG");
 414                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 415                                 fw3_ipt_rule_replace(r, "FORWARD");
 416                         }
 417
 418                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 419                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 420                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 421                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 422                         fw3_ipt_rule_target(r, "TCPMSS");
 423                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 424                         fw3_ipt_rule_replace(r, "FORWARD");
 425                 }
 426         }
 427         else if (handle->table == FW3_TABLE_RAW)
 428         {
 429                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 430                 {
 431                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 432                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 433                         fw3_ipt_rule_extra(r, zone->extra_src);
 434                         fw3_ipt_rule_replace(r, "PREROUTING");
 435                 }
 436         }
 437 }
 438
 439 static void
 440 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 441                       bool reload, struct fw3_zone *zone)
 442 {
 443         struct fw3_device *dev;
 444         struct fw3_address *sub;
 445
 446         fw3_foreach(dev, &zone->devices)
 447         fw3_foreach(sub, &zone->subnets)
 448         {
 449                 if (!fw3_is_family(sub, handle->family))
 450                         continue;
 451
 452                 if (!dev && !sub)
 453                         continue;
 454
 455                 print_interface_rule(handle, state, reload, zone, dev, sub);
 456         }
 457 }
 458
 459 static struct fw3_address *
 460 next_addr(struct fw3_address *addr, struct list_head *list,
 461                 enum fw3_family family, bool invert)
 462 {
 463         struct list_head *p;
 464         struct fw3_address *rv;
 465
 466         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 467         {
 468                 rv = list_entry(p, struct fw3_address, list);
 469
 470                 if (fw3_is_family(rv, family) && rv->invert == invert)
 471                         return rv;
 472         }
 473
 474         return NULL;
 475 }
 476
 477 static void
 478 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 479                 bool reload, struct fw3_zone *zone)
 480 {
 481         bool first_src, first_dest;
 482         struct fw3_address *msrc;
 483         struct fw3_address *mdest;
 484         struct fw3_ipt_rule *r;
 485
 486         enum fw3_flag t;
 487         char buf[32];
 488
 489         if (!fw3_is_family(zone, handle->family))
 490                 return;
 491
 492         switch (handle->table)
 493         {
 494         case FW3_TABLE_FILTER:
 495                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 496                 {
 497                         r = fw3_ipt_rule_new(handle);
 498                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 499                         fw3_ipt_rule_comment(r, "Accept port redirections");
 500                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 501                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 502
 503                         r = fw3_ipt_rule_new(handle);
 504                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 505                         fw3_ipt_rule_comment(r, "Accept port forwards");
 506                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 507                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 508                 }
 509
 510                 r = fw3_ipt_rule_new(handle);
 511                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 512                                      fw3_flag_names[zone->policy_input]);
 513                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 514
 515                 r = fw3_ipt_rule_new(handle);
 516                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 517                                      fw3_flag_names[zone->policy_forward]);
 518                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 519
 520                 r = fw3_ipt_rule_new(handle);
 521                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 522                                      fw3_flag_names[zone->policy_output]);
 523                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 524
 525                 if (zone->log)
 526                 {
 527                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 528                         {
 529                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 530                                 {
 531                                         r = fw3_ipt_rule_new(handle);
 532
 533                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 534                                                  fw3_flag_names[t], zone->name);
 535
 536                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 537                                         fw3_ipt_rule_target(r, "LOG");
 538                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 539                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 540                                                             zone->name, fw3_flag_names[t]);
 541                                 }
 542
 543                                 if (has(zone->flags, handle->family, t))
 544                                 {
 545                                         r = fw3_ipt_rule_new(handle);
 546
 547                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 548                                                  fw3_flag_names[t], zone->name);
 549
 550                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 551                                         fw3_ipt_rule_target(r, "LOG");
 552                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 553                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 554                                                             zone->name, fw3_flag_names[t]);
 555                                 }
 556                         }
 557                 }
 558                 break;
 559
 560         case FW3_TABLE_NAT:
 561                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 562                 {
 563                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 564                         for (msrc = NULL;
 565                              (msrc = next_addr(msrc, &zone->masq_src,
 566                                                handle->family, true)) != NULL; )
 567                         {
 568                                 msrc->invert = false;
 569                                 r = fw3_ipt_rule_new(handle);
 570                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 571                                 fw3_ipt_rule_target(r, "RETURN");
 572                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 573                                 msrc->invert = true;
 574                         }
 575
 576                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 577                         for (mdest = NULL;
 578                              (mdest = next_addr(mdest, &zone->masq_dest,
 579                                                 handle->family, true)) != NULL; )
 580                         {
 581                                 mdest->invert = false;
 582                                 r = fw3_ipt_rule_new(handle);
 583                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 584                                 fw3_ipt_rule_target(r, "RETURN");
 585                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 586                                 mdest->invert = true;
 587                         }
 588
 589                         /* emit masquerading entries for non-negated addresses
 590                            and ensure that both src and dest loops run at least once,
 591                            even if there are no relevant addresses */
 592                         for (first_src = true, msrc = NULL;
 593                              (msrc = next_addr(msrc, &zone->masq_src,
 594                                                    handle->family, false)) || first_src;
 595                              first_src = false)
 596                         {
 597                                 for (first_dest = true, mdest = NULL;
 598                                      (mdest = next_addr(mdest, &zone->masq_dest,
 599                                                             handle->family, false)) || first_dest;
 600                                      first_dest = false)
 601                                 {
 602                                         r = fw3_ipt_rule_new(handle);
 603                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 604                                         fw3_ipt_rule_target(r, "MASQUERADE");
 605                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 606                                 }
 607                         }
 608                 }
 609                 break;
 610
 611         case FW3_TABLE_RAW:
 612         case FW3_TABLE_MANGLE:
 613                 break;
 614         }
 615
 616         print_interface_rules(handle, state, reload, zone);
 617 }
 618
 619 void
 620 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 621                       bool reload)
 622 {
 623         struct fw3_zone *zone;
 624
 625         list_for_each_entry(zone, &state->zones, list)
 626                 print_zone_chain(handle, state, reload, zone);
 627 }
 628
 629 void
 630 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 631                      bool reload)
 632 {
 633         struct fw3_zone *zone;
 634
 635         list_for_each_entry(zone, &state->zones, list)
 636                 print_zone_rule(handle, state, reload, zone);
 637 }
 638
 639 void
 640 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 641                 bool reload)
 642 {
 643         struct fw3_zone *z, *tmp;
 644         const struct fw3_chain_spec *c;
 645         char chain[32];
 646
 647         list_for_each_entry_safe(z, tmp, &state->zones, list)
 648         {
 649                 if (!has(z->flags, handle->family, handle->table))
 650                         continue;
 651
 652                 for (c = zone_chains; c->format; c++)
 653                 {
 654                         /* don't touch user chains on selective stop */
 655                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 656                                 continue;
 657
 658                         if (!fw3_is_family(c, handle->family))
 659                                 continue;
 660
 661                         if (c->table != handle->table)
 662                                 continue;
 663
 664                         if (c->flag && !has(z->flags, handle->family, c->flag))
 665                                 continue;
 666
 667                         snprintf(chain, sizeof(chain), c->format, z->name);
 668                         fw3_ipt_flush_chain(handle, chain);
 669
 670                         /* keep certain basic chains that do not depend on any settings to
 671                            avoid purging unrelated user rules pointing to them */
 672                         if (reload && !c->flag)
 673                                 continue;
 674
 675                         fw3_ipt_delete_chain(handle, chain);
 676                 }
 677
 678                 del(z->flags, handle->family, handle->table);
 679         }
 680 }
 681
 682 void
 683 fw3_hotplug_zones(struct fw3_state *state, bool add)
 684 {
 685         struct fw3_zone *z;
 686         struct fw3_device *d;
 687
 688         list_for_each_entry(z, &state->zones, list)
 689         {
 690                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 691                 {
 692                         list_for_each_entry(d, &z->devices, list)
 693                                 fw3_hotplug(add, z, d);
 694
 695                         if (add)
 696                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 697                         else
 698                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 699                 }
 700         }
 701 }
 702
 703 struct fw3_zone *
 704 fw3_lookup_zone(struct fw3_state *state, const char *name)
 705 {
 706         struct fw3_zone *z;
 707
 708         if (list_empty(&state->zones))
 709                 return NULL;
 710
 711         list_for_each_entry(z, &state->zones, list)
 712         {
 713                 if (strcmp(z->name, name))
 714                         continue;
 715
 716                 return z;
 717         }
 718
 719         return NULL;
 720 }
 721
 722 struct list_head *
 723 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 724 {
 725         struct fw3_device *net;
 726         struct fw3_address *cur, *tmp;
 727         struct list_head *all;
 728
 729         all = calloc(1, sizeof(*all));
 730         if (!all)
 731                 return NULL;
 732
 733         INIT_LIST_HEAD(all);
 734
 735         if (addr && addr->set)
 736         {
 737                 tmp = malloc(sizeof(*tmp));
 738
 739                 if (tmp)
 740                 {
 741                         *tmp = *addr;
 742                         list_add_tail(&tmp->list, all);
 743                 }
 744         }
 745         else
 746         {
 747                 list_for_each_entry(net, &zone->networks, list)
 748                         fw3_ubus_address(all, net->name);
 749
 750                 list_for_each_entry(cur, &zone->subnets, list)
 751                 {
 752                         tmp = malloc(sizeof(*tmp));
 753
 754                         if (!tmp)
 755                                 continue;
 756
 757                         *tmp = *cur;
 758                         list_add_tail(&tmp->list, all);
 759                 }
 760         }
 761
 762         return all;
 763 }