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
 361                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 362                                         fw3_ipt_rule_extra(r,
 363                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 364
 365                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 366                                                      fw3_flag_names[t]);
 367                         }
 368                 }
 369
 370                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 371                 {
 372                         if (*chains[i] == 'o')
 373                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 374                         else
 375                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 376
 377                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 378
 379                         if (*chains[i] == 'o')
 380                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 381                         else
 382                                 fw3_ipt_rule_extra(r, zone->extra_src);
 383
 384                         fw3_ipt_rule_replace(r, chains[i + 1]);
 385                 }
 386         }
 387         else if (handle->table == FW3_TABLE_NAT)
 388         {
 389                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 390                 {
 391                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 392                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 393                         fw3_ipt_rule_extra(r, zone->extra_src);
 394                         fw3_ipt_rule_replace(r, "PREROUTING");
 395                 }
 396
 397                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 398                 {
 399                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 400                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 401                         fw3_ipt_rule_extra(r, zone->extra_dest);
 402                         fw3_ipt_rule_replace(r, "POSTROUTING");
 403                 }
 404         }
 405         else if (handle->table == FW3_TABLE_MANGLE)
 406         {
 407                 if (zone->mtu_fix)
 408                 {
 409                         if (zone->log)
 410                         {
 411                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 412
 413                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 414                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 415                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 416                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 417                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 418                                 fw3_ipt_rule_target(r, "LOG");
 419                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 420                                 fw3_ipt_rule_replace(r, "FORWARD");
 421                         }
 422
 423                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 424                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 425                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 426                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 427                         fw3_ipt_rule_target(r, "TCPMSS");
 428                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 429                         fw3_ipt_rule_replace(r, "FORWARD");
 430                 }
 431         }
 432         else if (handle->table == FW3_TABLE_RAW)
 433         {
 434                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 435                 {
 436                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 437                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 438                         fw3_ipt_rule_extra(r, zone->extra_src);
 439                         fw3_ipt_rule_replace(r, "PREROUTING");
 440                 }
 441         }
 442 }
 443
 444 static void
 445 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 446                       bool reload, struct fw3_zone *zone)
 447 {
 448         struct fw3_device *dev;
 449         struct fw3_address *sub;
 450
 451         fw3_foreach(dev, &zone->devices)
 452         fw3_foreach(sub, &zone->subnets)
 453         {
 454                 if (!fw3_is_family(sub, handle->family))
 455                         continue;
 456
 457                 if (!dev && !sub)
 458                         continue;
 459
 460                 print_interface_rule(handle, state, reload, zone, dev, sub);
 461         }
 462 }
 463
 464 static struct fw3_address *
 465 next_addr(struct fw3_address *addr, struct list_head *list,
 466                 enum fw3_family family, bool invert)
 467 {
 468         struct list_head *p;
 469         struct fw3_address *rv;
 470
 471         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 472         {
 473                 rv = list_entry(p, struct fw3_address, list);
 474
 475                 if (fw3_is_family(rv, family) && rv->invert == invert)
 476                         return rv;
 477         }
 478
 479         return NULL;
 480 }
 481
 482 static void
 483 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 484                 bool reload, struct fw3_zone *zone)
 485 {
 486         bool first_src, first_dest;
 487         struct fw3_address *msrc;
 488         struct fw3_address *mdest;
 489         struct fw3_ipt_rule *r;
 490
 491         enum fw3_flag t;
 492         char buf[32];
 493
 494         if (!fw3_is_family(zone, handle->family))
 495                 return;
 496
 497         switch (handle->table)
 498         {
 499         case FW3_TABLE_FILTER:
 500                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 501                 {
 502                         r = fw3_ipt_rule_new(handle);
 503                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 504                         fw3_ipt_rule_comment(r, "Accept port redirections");
 505                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 506                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 507
 508                         r = fw3_ipt_rule_new(handle);
 509                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 510                         fw3_ipt_rule_comment(r, "Accept port forwards");
 511                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 512                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 513                 }
 514
 515                 r = fw3_ipt_rule_new(handle);
 516                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 517                                      fw3_flag_names[zone->policy_input]);
 518                 fw3_ipt_rule_append(r, "zone_%s_input", 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_forward]);
 523                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 524
 525                 r = fw3_ipt_rule_new(handle);
 526                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 527                                      fw3_flag_names[zone->policy_output]);
 528                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 529
 530                 if (zone->log)
 531                 {
 532                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 533                         {
 534                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 535                                 {
 536                                         r = fw3_ipt_rule_new(handle);
 537
 538                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 539                                                  fw3_flag_names[t], zone->name);
 540
 541                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 542                                         fw3_ipt_rule_target(r, "LOG");
 543                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 544                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 545                                                             zone->name, fw3_flag_names[t]);
 546                                 }
 547
 548                                 if (has(zone->flags, handle->family, t))
 549                                 {
 550                                         r = fw3_ipt_rule_new(handle);
 551
 552                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 553                                                  fw3_flag_names[t], zone->name);
 554
 555                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 556                                         fw3_ipt_rule_target(r, "LOG");
 557                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 558                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 559                                                             zone->name, fw3_flag_names[t]);
 560                                 }
 561                         }
 562                 }
 563                 break;
 564
 565         case FW3_TABLE_NAT:
 566                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 567                 {
 568                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 569                         for (msrc = NULL;
 570                              (msrc = next_addr(msrc, &zone->masq_src,
 571                                                handle->family, true)) != NULL; )
 572                         {
 573                                 msrc->invert = false;
 574                                 r = fw3_ipt_rule_new(handle);
 575                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 576                                 fw3_ipt_rule_target(r, "RETURN");
 577                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 578                                 msrc->invert = true;
 579                         }
 580
 581                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 582                         for (mdest = NULL;
 583                              (mdest = next_addr(mdest, &zone->masq_dest,
 584                                                 handle->family, true)) != NULL; )
 585                         {
 586                                 mdest->invert = false;
 587                                 r = fw3_ipt_rule_new(handle);
 588                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 589                                 fw3_ipt_rule_target(r, "RETURN");
 590                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 591                                 mdest->invert = true;
 592                         }
 593
 594                         /* emit masquerading entries for non-negated addresses
 595                            and ensure that both src and dest loops run at least once,
 596                            even if there are no relevant addresses */
 597                         for (first_src = true, msrc = NULL;
 598                              (msrc = next_addr(msrc, &zone->masq_src,
 599                                                    handle->family, false)) || first_src;
 600                              first_src = false)
 601                         {
 602                                 for (first_dest = true, mdest = NULL;
 603                                      (mdest = next_addr(mdest, &zone->masq_dest,
 604                                                             handle->family, false)) || first_dest;
 605                                      first_dest = false)
 606                                 {
 607                                         r = fw3_ipt_rule_new(handle);
 608                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 609                                         fw3_ipt_rule_target(r, "MASQUERADE");
 610                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 611                                 }
 612                         }
 613                 }
 614                 break;
 615
 616         case FW3_TABLE_RAW:
 617         case FW3_TABLE_MANGLE:
 618                 break;
 619         }
 620
 621         print_interface_rules(handle, state, reload, zone);
 622 }
 623
 624 void
 625 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 626                       bool reload)
 627 {
 628         struct fw3_zone *zone;
 629
 630         list_for_each_entry(zone, &state->zones, list)
 631                 print_zone_chain(handle, state, reload, zone);
 632 }
 633
 634 void
 635 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 636                      bool reload)
 637 {
 638         struct fw3_zone *zone;
 639
 640         list_for_each_entry(zone, &state->zones, list)
 641                 print_zone_rule(handle, state, reload, zone);
 642 }
 643
 644 void
 645 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 646                 bool reload)
 647 {
 648         struct fw3_zone *z, *tmp;
 649         const struct fw3_chain_spec *c;
 650         char chain[32];
 651
 652         list_for_each_entry_safe(z, tmp, &state->zones, list)
 653         {
 654                 if (!has(z->flags, handle->family, handle->table))
 655                         continue;
 656
 657                 for (c = zone_chains; c->format; c++)
 658                 {
 659                         /* don't touch user chains on selective stop */
 660                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 661                                 continue;
 662
 663                         if (!fw3_is_family(c, handle->family))
 664                                 continue;
 665
 666                         if (c->table != handle->table)
 667                                 continue;
 668
 669                         if (c->flag && !has(z->flags, handle->family, c->flag))
 670                                 continue;
 671
 672                         snprintf(chain, sizeof(chain), c->format, z->name);
 673                         fw3_ipt_flush_chain(handle, chain);
 674
 675                         /* keep certain basic chains that do not depend on any settings to
 676                            avoid purging unrelated user rules pointing to them */
 677                         if (reload && !c->flag)
 678                                 continue;
 679
 680                         fw3_ipt_delete_chain(handle, chain);
 681                 }
 682
 683                 del(z->flags, handle->family, handle->table);
 684         }
 685 }
 686
 687 void
 688 fw3_hotplug_zones(struct fw3_state *state, bool add)
 689 {
 690         struct fw3_zone *z;
 691         struct fw3_device *d;
 692
 693         list_for_each_entry(z, &state->zones, list)
 694         {
 695                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 696                 {
 697                         list_for_each_entry(d, &z->devices, list)
 698                                 fw3_hotplug(add, z, d);
 699
 700                         if (add)
 701                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 702                         else
 703                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 704                 }
 705         }
 706 }
 707
 708 struct fw3_zone *
 709 fw3_lookup_zone(struct fw3_state *state, const char *name)
 710 {
 711         struct fw3_zone *z;
 712
 713         if (list_empty(&state->zones))
 714                 return NULL;
 715
 716         list_for_each_entry(z, &state->zones, list)
 717         {
 718                 if (strcmp(z->name, name))
 719                         continue;
 720
 721                 return z;
 722         }
 723
 724         return NULL;
 725 }
 726
 727 struct list_head *
 728 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 729 {
 730         struct fw3_device *net;
 731         struct fw3_address *cur, *tmp;
 732         struct list_head *all;
 733
 734         all = calloc(1, sizeof(*all));
 735         if (!all)
 736                 return NULL;
 737
 738         INIT_LIST_HEAD(all);
 739
 740         if (addr && addr->set)
 741         {
 742                 tmp = malloc(sizeof(*tmp));
 743
 744                 if (tmp)
 745                 {
 746                         *tmp = *addr;
 747                         list_add_tail(&tmp->list, all);
 748                 }
 749         }
 750         else
 751         {
 752                 list_for_each_entry(net, &zone->networks, list)
 753                         fw3_ubus_address(all, net->name);
 754
 755                 list_for_each_entry(cur, &zone->subnets, list)
 756                 {
 757                         tmp = malloc(sizeof(*tmp));
 758
 759                         if (!tmp)
 760                                 continue;
 761
 762                         *tmp = *cur;
 763                         list_add_tail(&tmp->list, all);
 764                 }
 765         }
 766
 767         return all;
 768 }