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_OPT("masq_allow_invalid",  bool,     zone,     masq_allow_invalid),
  70         FW3_LIST("masq_src",           network,  zone,     masq_src),
  71         FW3_LIST("masq_dest",          network,  zone,     masq_dest),
  72
  73         FW3_OPT("extra",               string,   zone,     extra_src),
  74         FW3_OPT("extra_src",           string,   zone,     extra_src),
  75         FW3_OPT("extra_dest",          string,   zone,     extra_dest),
  76
  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         FW3_LIST("__addrs",            address,  zone,     old_addrs),
  87
  88         { }
  89 };
  90
  91
  92 static void
  93 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
  94              const char *name)
  95 {
  96         if (*pol == FW3_FLAG_UNSPEC)
  97         {
  98                 warn_elem(e, "has no %s policy specified, using default", name);
  99                 *pol = def;
 100         }
 101         else if (*pol > FW3_FLAG_DROP)
 102         {
 103                 warn_elem(e, "has invalid %s policy, using default", name);
 104                 *pol = def;
 105         }
 106 }
 107
 108 static void
 109 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
 110 {
 111         struct fw3_device *net, *tmp;
 112
 113         list_for_each_entry(net, &zone->networks, list)
 114         {
 115                 tmp = fw3_ubus_device(net->name);
 116
 117                 if (!tmp)
 118                 {
 119                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
 120                         continue;
 121                 }
 122
 123                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
 124                 list_add_tail(&tmp->list, &zone->devices);
 125         }
 126 }
 127
 128 struct fw3_zone *
 129 fw3_alloc_zone(void)
 130 {
 131         struct fw3_zone *zone;
 132
 133         zone = calloc(1, sizeof(*zone));
 134         if (!zone)
 135                 return NULL;
 136
 137         INIT_LIST_HEAD(&zone->networks);
 138         INIT_LIST_HEAD(&zone->devices);
 139         INIT_LIST_HEAD(&zone->subnets);
 140         INIT_LIST_HEAD(&zone->masq_src);
 141         INIT_LIST_HEAD(&zone->masq_dest);
 142
 143         INIT_LIST_HEAD(&zone->old_addrs);
 144
 145         zone->enabled = true;
 146         zone->custom_chains = true;
 147         zone->log_limit.rate = 10;
 148
 149         return zone;
 150 }
 151
 152 void
 153 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
 154 {
 155         struct uci_section *s;
 156         struct uci_element *e;
 157         struct fw3_zone *zone;
 158         struct fw3_defaults *defs = &state->defaults;
 159
 160         INIT_LIST_HEAD(&state->zones);
 161
 162         uci_foreach_element(&p->sections, e)
 163         {
 164                 s = uci_to_section(e);
 165
 166                 if (strcmp(s->type, "zone"))
 167                         continue;
 168
 169                 zone = fw3_alloc_zone();
 170
 171                 if (!zone)
 172                         continue;
 173
 174                 if (!fw3_parse_options(zone, fw3_zone_opts, s))
 175                         warn_elem(e, "has invalid options");
 176
 177                 if (!zone->enabled)
 178                 {
 179                         fw3_free_zone(zone);
 180                         continue;
 181                 }
 182
 183                 if (!zone->extra_dest)
 184                         zone->extra_dest = zone->extra_src;
 185
 186                 if (!defs->custom_chains && zone->custom_chains)
 187                         zone->custom_chains = false;
 188
 189                 if (!zone->name || !*zone->name)
 190                 {
 191                         warn_elem(e, "has no name - ignoring");
 192                         fw3_free_zone(zone);
 193                         continue;
 194                 }
 195
 196                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
 197                 {
 198                         warn_elem(e, "must not have a name longer than %u characters",
 199                                      FW3_ZONE_MAXNAMELEN);
 200                         fw3_free_zone(zone);
 201                         continue;
 202                 }
 203
 204                 fw3_ubus_zone_devices(zone);
 205
 206                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 207                     list_empty(&zone->subnets) && !zone->extra_src)
 208                 {
 209                         warn_elem(e, "has no device, network, subnet or extra options");
 210                 }
 211
 212                 check_policy(e, &zone->policy_input, defs->policy_input, "input");
 213                 check_policy(e, &zone->policy_output, defs->policy_output, "output");
 214                 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
 215
 216                 resolve_networks(e, zone);
 217
 218                 if (zone->masq)
 219                 {
 220                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 221                 }
 222
 223                 if (zone->custom_chains)
 224                 {
 225                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 226                         fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
 227                 }
 228
 229                 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 230                 fw3_setbit(zone->flags[0], zone->policy_forward);
 231                 fw3_setbit(zone->flags[0], zone->policy_output);
 232
 233                 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 234                 fw3_setbit(zone->flags[1], zone->policy_forward);
 235                 fw3_setbit(zone->flags[1], zone->policy_output);
 236
 237                 list_add_tail(&zone->list, &state->zones);
 238         }
 239 }
 240
 241
 242 static void
 243 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 244                  bool reload, struct fw3_zone *zone)
 245 {
 246         int i;
 247         struct fw3_ipt_rule *r;
 248         const struct fw3_chain_spec *c;
 249
 250         const char *flt_chains[] = {
 251                 "input",   "input",
 252                 "output",  "output",
 253                 "forward", "forwarding",
 254         };
 255
 256         const char *nat_chains[] = {
 257                 "prerouting",  "prerouting",
 258                 "postrouting", "postrouting",
 259         };
 260
 261         if (!fw3_is_family(zone, handle->family))
 262                 return;
 263
 264         info("   * Zone '%s'", zone->name);
 265
 266         set(zone->flags, handle->family, handle->table);
 267
 268         if (zone->custom_chains)
 269                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 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                     !fw3_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", "INPUT",
 332                 "output", "OUTPUT",
 333                 "forward", "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
 349                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 350                                         fw3_ipt_rule_extra(r,
 351                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 352
 353                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 354                                                      fw3_flag_names[t]);
 355                         }
 356
 357                         if (has(zone->flags, handle->family, t))
 358                         {
 359                                 if (t == FW3_FLAG_ACCEPT &&
 360                                     zone->masq && !zone->masq_allow_invalid)
 361                                 {
 362                                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 363                                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID");
 364                                         fw3_ipt_rule_comment(r, "Prevent NAT leakage");
 365                                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_DROP]);
 366                                         fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 367                                                              fw3_flag_names[t]);
 368                                 }
 369
 370                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 371                                 fw3_ipt_rule_target(r, jump_target(t));
 372                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 373                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 374                                                      fw3_flag_names[t]);
 375                         }
 376                 }
 377
 378                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 379                 {
 380                         if (*chains[i] == 'o')
 381                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 382                         else
 383                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 384
 385                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 386
 387                         if (*chains[i] == 'o')
 388                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 389                         else
 390                                 fw3_ipt_rule_extra(r, zone->extra_src);
 391
 392                         fw3_ipt_rule_replace(r, chains[i + 1]);
 393                 }
 394         }
 395         else if (handle->table == FW3_TABLE_NAT)
 396         {
 397                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 398                 {
 399                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 400                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 401                         fw3_ipt_rule_extra(r, zone->extra_src);
 402                         fw3_ipt_rule_replace(r, "PREROUTING");
 403                 }
 404
 405                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 406                 {
 407                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 408                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 409                         fw3_ipt_rule_extra(r, zone->extra_dest);
 410                         fw3_ipt_rule_replace(r, "POSTROUTING");
 411                 }
 412         }
 413         else if (handle->table == FW3_TABLE_MANGLE)
 414         {
 415                 if (zone->mtu_fix)
 416                 {
 417                         if (zone->log)
 418                         {
 419                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 420
 421                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 422                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 423                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 424                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 425                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 426                                 fw3_ipt_rule_target(r, "LOG");
 427                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 428                                 fw3_ipt_rule_replace(r, "FORWARD");
 429                         }
 430
 431                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 432                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 433                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 434                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 435                         fw3_ipt_rule_target(r, "TCPMSS");
 436                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 437                         fw3_ipt_rule_replace(r, "FORWARD");
 438                 }
 439         }
 440         else if (handle->table == FW3_TABLE_RAW)
 441         {
 442                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 443                 {
 444                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 445                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 446                         fw3_ipt_rule_extra(r, zone->extra_src);
 447                         fw3_ipt_rule_replace(r, "PREROUTING");
 448                 }
 449         }
 450 }
 451
 452 static void
 453 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 454                       bool reload, struct fw3_zone *zone)
 455 {
 456         struct fw3_device *dev;
 457         struct fw3_address *sub;
 458
 459         fw3_foreach(dev, &zone->devices)
 460         fw3_foreach(sub, &zone->subnets)
 461         {
 462                 if (!fw3_is_family(sub, handle->family))
 463                         continue;
 464
 465                 if (!dev && !sub)
 466                         continue;
 467
 468                 print_interface_rule(handle, state, reload, zone, dev, sub);
 469         }
 470 }
 471
 472 static struct fw3_address *
 473 next_addr(struct fw3_address *addr, struct list_head *list,
 474                 enum fw3_family family, bool invert)
 475 {
 476         struct list_head *p;
 477         struct fw3_address *rv;
 478
 479         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 480         {
 481                 rv = list_entry(p, struct fw3_address, list);
 482
 483                 if (fw3_is_family(rv, family) && rv->invert == invert)
 484                         return rv;
 485         }
 486
 487         return NULL;
 488 }
 489
 490 static void
 491 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 492                 bool reload, struct fw3_zone *zone)
 493 {
 494         bool first_src, first_dest;
 495         struct fw3_address *msrc;
 496         struct fw3_address *mdest;
 497         struct fw3_ipt_rule *r;
 498
 499         enum fw3_flag t;
 500         char buf[32];
 501
 502         if (!fw3_is_family(zone, handle->family))
 503                 return;
 504
 505         switch (handle->table)
 506         {
 507         case FW3_TABLE_FILTER:
 508                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 509                 {
 510                         r = fw3_ipt_rule_new(handle);
 511                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 512                         fw3_ipt_rule_comment(r, "Accept port redirections");
 513                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 514                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 515
 516                         r = fw3_ipt_rule_new(handle);
 517                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 518                         fw3_ipt_rule_comment(r, "Accept port forwards");
 519                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 520                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 521                 }
 522
 523                 r = fw3_ipt_rule_new(handle);
 524                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 525                                      fw3_flag_names[zone->policy_input]);
 526                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 527
 528                 r = fw3_ipt_rule_new(handle);
 529                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 530                                      fw3_flag_names[zone->policy_forward]);
 531                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 532
 533                 r = fw3_ipt_rule_new(handle);
 534                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 535                                      fw3_flag_names[zone->policy_output]);
 536                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 537
 538                 if (zone->log)
 539                 {
 540                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 541                         {
 542                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 543                                 {
 544                                         r = fw3_ipt_rule_new(handle);
 545
 546                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 547                                                  fw3_flag_names[t], zone->name);
 548
 549                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 550                                         fw3_ipt_rule_target(r, "LOG");
 551                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 552                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 553                                                             zone->name, fw3_flag_names[t]);
 554                                 }
 555
 556                                 if (has(zone->flags, handle->family, t))
 557                                 {
 558                                         r = fw3_ipt_rule_new(handle);
 559
 560                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 561                                                  fw3_flag_names[t], zone->name);
 562
 563                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 564                                         fw3_ipt_rule_target(r, "LOG");
 565                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 566                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 567                                                             zone->name, fw3_flag_names[t]);
 568                                 }
 569                         }
 570                 }
 571                 break;
 572
 573         case FW3_TABLE_NAT:
 574                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 575                 {
 576                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 577                         for (msrc = NULL;
 578                              (msrc = next_addr(msrc, &zone->masq_src,
 579                                                handle->family, true)) != NULL; )
 580                         {
 581                                 msrc->invert = false;
 582                                 r = fw3_ipt_rule_new(handle);
 583                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 584                                 fw3_ipt_rule_target(r, "RETURN");
 585                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 586                                 msrc->invert = true;
 587                         }
 588
 589                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 590                         for (mdest = NULL;
 591                              (mdest = next_addr(mdest, &zone->masq_dest,
 592                                                 handle->family, true)) != NULL; )
 593                         {
 594                                 mdest->invert = false;
 595                                 r = fw3_ipt_rule_new(handle);
 596                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 597                                 fw3_ipt_rule_target(r, "RETURN");
 598                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 599                                 mdest->invert = true;
 600                         }
 601
 602                         /* emit masquerading entries for non-negated addresses
 603                            and ensure that both src and dest loops run at least once,
 604                            even if there are no relevant addresses */
 605                         for (first_src = true, msrc = NULL;
 606                              (msrc = next_addr(msrc, &zone->masq_src,
 607                                                    handle->family, false)) || first_src;
 608                              first_src = false)
 609                         {
 610                                 for (first_dest = true, mdest = NULL;
 611                                      (mdest = next_addr(mdest, &zone->masq_dest,
 612                                                             handle->family, false)) || first_dest;
 613                                      first_dest = false)
 614                                 {
 615                                         r = fw3_ipt_rule_new(handle);
 616                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 617                                         fw3_ipt_rule_target(r, "MASQUERADE");
 618                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 619                                 }
 620                         }
 621                 }
 622                 break;
 623
 624         case FW3_TABLE_RAW:
 625         case FW3_TABLE_MANGLE:
 626                 break;
 627         }
 628
 629         print_interface_rules(handle, state, reload, zone);
 630 }
 631
 632 void
 633 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 634                       bool reload)
 635 {
 636         struct fw3_zone *zone;
 637
 638         list_for_each_entry(zone, &state->zones, list)
 639                 print_zone_chain(handle, state, reload, zone);
 640 }
 641
 642 void
 643 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 644                      bool reload)
 645 {
 646         struct fw3_zone *zone;
 647
 648         list_for_each_entry(zone, &state->zones, list)
 649                 print_zone_rule(handle, state, reload, zone);
 650 }
 651
 652 void
 653 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 654                 bool reload)
 655 {
 656         struct fw3_zone *z, *tmp;
 657         const struct fw3_chain_spec *c;
 658         char chain[32];
 659
 660         list_for_each_entry_safe(z, tmp, &state->zones, list)
 661         {
 662                 if (!has(z->flags, handle->family, handle->table))
 663                         continue;
 664
 665                 for (c = zone_chains; c->format; c++)
 666                 {
 667                         /* don't touch user chains on selective stop */
 668                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 669                                 continue;
 670
 671                         if (!fw3_is_family(c, handle->family))
 672                                 continue;
 673
 674                         if (c->table != handle->table)
 675                                 continue;
 676
 677                         if (c->flag && !has(z->flags, handle->family, c->flag))
 678                                 continue;
 679
 680                         snprintf(chain, sizeof(chain), c->format, z->name);
 681                         fw3_ipt_flush_chain(handle, chain);
 682
 683                         /* keep certain basic chains that do not depend on any settings to
 684                            avoid purging unrelated user rules pointing to them */
 685                         if (reload && !c->flag)
 686                                 continue;
 687
 688                         fw3_ipt_delete_chain(handle, chain);
 689                 }
 690
 691                 del(z->flags, handle->family, handle->table);
 692         }
 693 }
 694
 695 void
 696 fw3_hotplug_zones(struct fw3_state *state, bool add)
 697 {
 698         struct fw3_zone *z;
 699         struct fw3_device *d;
 700
 701         list_for_each_entry(z, &state->zones, list)
 702         {
 703                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 704                 {
 705                         list_for_each_entry(d, &z->devices, list)
 706                                 fw3_hotplug(add, z, d);
 707
 708                         if (add)
 709                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 710                         else
 711                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 712                 }
 713         }
 714 }
 715
 716 struct fw3_zone *
 717 fw3_lookup_zone(struct fw3_state *state, const char *name)
 718 {
 719         struct fw3_zone *z;
 720
 721         if (list_empty(&state->zones))
 722                 return NULL;
 723
 724         list_for_each_entry(z, &state->zones, list)
 725         {
 726                 if (strcmp(z->name, name))
 727                         continue;
 728
 729                 return z;
 730         }
 731
 732         return NULL;
 733 }
 734
 735 struct list_head *
 736 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 737 {
 738         struct fw3_device *net;
 739         struct fw3_address *cur, *tmp;
 740         struct list_head *all;
 741
 742         all = calloc(1, sizeof(*all));
 743         if (!all)
 744                 return NULL;
 745
 746         INIT_LIST_HEAD(all);
 747
 748         if (addr && addr->set)
 749         {
 750                 tmp = malloc(sizeof(*tmp));
 751
 752                 if (tmp)
 753                 {
 754                         *tmp = *addr;
 755                         list_add_tail(&tmp->list, all);
 756                 }
 757         }
 758         else
 759         {
 760                 list_for_each_entry(net, &zone->networks, list)
 761                         fw3_ubus_address(all, net->name);
 762
 763                 list_for_each_entry(cur, &zone->subnets, list)
 764                 {
 765                         tmp = malloc(sizeof(*tmp));
 766
 767                         if (!tmp)
 768                                 continue;
 769
 770                         *tmp = *cur;
 771                         list_add_tail(&tmp->list, all);
 772                 }
 773         }
 774
 775         return all;
 776 }