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                 fw3_parse_options(zone, fw3_zone_opts, s);
 175
 176                 if (!zone->enabled)
 177                 {
 178                         fw3_free_zone(zone);
 179                         continue;
 180                 }
 181
 182                 if (!zone->extra_dest)
 183                         zone->extra_dest = zone->extra_src;
 184
 185                 if (!defs->custom_chains && zone->custom_chains)
 186                         zone->custom_chains = false;
 187
 188                 if (!zone->name || !*zone->name)
 189                 {
 190                         warn_elem(e, "has no name - ignoring");
 191                         fw3_free_zone(zone);
 192                         continue;
 193                 }
 194
 195                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
 196                 {
 197                         warn_elem(e, "must not have a name longer than %u characters",
 198                                      FW3_ZONE_MAXNAMELEN);
 199                         fw3_free_zone(zone);
 200                         continue;
 201                 }
 202
 203                 fw3_ubus_zone_devices(zone);
 204
 205                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 206                     list_empty(&zone->subnets) && !zone->extra_src)
 207                 {
 208                         warn_elem(e, "has no device, network, subnet or extra options");
 209                 }
 210
 211                 check_policy(e, &zone->policy_input, defs->policy_input, "input");
 212                 check_policy(e, &zone->policy_output, defs->policy_output, "output");
 213                 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
 214
 215                 resolve_networks(e, zone);
 216
 217                 if (zone->masq)
 218                 {
 219                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 220                 }
 221
 222                 if (zone->custom_chains)
 223                 {
 224                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 225                         fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
 226                 }
 227
 228                 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 229                 fw3_setbit(zone->flags[0], zone->policy_forward);
 230                 fw3_setbit(zone->flags[0], zone->policy_output);
 231
 232                 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 233                 fw3_setbit(zone->flags[1], zone->policy_forward);
 234                 fw3_setbit(zone->flags[1], zone->policy_output);
 235
 236                 list_add_tail(&zone->list, &state->zones);
 237         }
 238 }
 239
 240
 241 static void
 242 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 243                  bool reload, struct fw3_zone *zone)
 244 {
 245         int i;
 246         struct fw3_ipt_rule *r;
 247         const struct fw3_chain_spec *c;
 248
 249         const char *flt_chains[] = {
 250                 "input",   "input",
 251                 "output",  "output",
 252                 "forward", "forwarding",
 253         };
 254
 255         const char *nat_chains[] = {
 256                 "prerouting",  "prerouting",
 257                 "postrouting", "postrouting",
 258         };
 259
 260         if (!fw3_is_family(zone, handle->family))
 261                 return;
 262
 263         info("   * Zone '%s'", zone->name);
 264
 265         set(zone->flags, handle->family, handle->table);
 266
 267         if (zone->custom_chains)
 268                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 269
 270         for (c = zone_chains; c->format; c++)
 271         {
 272                 /* don't touch user chains on selective stop */
 273                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 274                         continue;
 275
 276                 if (!fw3_is_family(c, handle->family))
 277                         continue;
 278
 279                 if (c->table != handle->table)
 280                         continue;
 281
 282                 if (c->flag &&
 283                     !fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 284                         continue;
 285
 286                 fw3_ipt_create_chain(handle, c->format, zone->name);
 287         }
 288
 289         if (zone->custom_chains)
 290         {
 291                 if (handle->table == FW3_TABLE_FILTER)
 292                 {
 293                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 294                         {
 295                                 r = fw3_ipt_rule_new(handle);
 296                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 297                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 298                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 299                         }
 300                 }
 301                 else if (handle->table == FW3_TABLE_NAT)
 302                 {
 303                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 304                         {
 305                                 r = fw3_ipt_rule_new(handle);
 306                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 307                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 308                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 309                         }
 310                 }
 311         }
 312
 313         set(zone->flags, handle->family, handle->table);
 314 }
 315
 316 static void
 317 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 318                                          bool reload, struct fw3_zone *zone,
 319                      struct fw3_device *dev, struct fw3_address *sub)
 320 {
 321         struct fw3_protocol tcp = { .protocol = 6 };
 322         struct fw3_ipt_rule *r;
 323         enum fw3_flag t;
 324
 325         char buf[32];
 326
 327         int i;
 328
 329         const char *chains[] = {
 330                 "input", "INPUT",
 331                 "output", "OUTPUT",
 332                 "forward", "FORWARD",
 333         };
 334
 335 #define jump_target(t) \
 336         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 337
 338         if (handle->table == FW3_TABLE_FILTER)
 339         {
 340                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 341                 {
 342                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 343                         {
 344                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 345                                 fw3_ipt_rule_target(r, jump_target(t));
 346                                 fw3_ipt_rule_extra(r, zone->extra_src);
 347
 348                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 349                                         fw3_ipt_rule_extra(r,
 350                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 351
 352                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 353                                                      fw3_flag_names[t]);
 354                         }
 355
 356                         if (has(zone->flags, handle->family, t))
 357                         {
 358                                 if (t == FW3_FLAG_ACCEPT &&
 359                                     zone->masq && !zone->masq_allow_invalid)
 360                                 {
 361                                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 362                                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID");
 363                                         fw3_ipt_rule_comment(r, "Prevent NAT leakage");
 364                                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_DROP]);
 365                                         fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 366                                                              fw3_flag_names[t]);
 367                                 }
 368
 369                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 370                                 fw3_ipt_rule_target(r, jump_target(t));
 371                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 372                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 373                                                      fw3_flag_names[t]);
 374                         }
 375                 }
 376
 377                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 378                 {
 379                         if (*chains[i] == 'o')
 380                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 381                         else
 382                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 383
 384                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 385
 386                         if (*chains[i] == 'o')
 387                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 388                         else
 389                                 fw3_ipt_rule_extra(r, zone->extra_src);
 390
 391                         fw3_ipt_rule_replace(r, chains[i + 1]);
 392                 }
 393         }
 394         else if (handle->table == FW3_TABLE_NAT)
 395         {
 396                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 397                 {
 398                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 399                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 400                         fw3_ipt_rule_extra(r, zone->extra_src);
 401                         fw3_ipt_rule_replace(r, "PREROUTING");
 402                 }
 403
 404                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 405                 {
 406                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 407                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 408                         fw3_ipt_rule_extra(r, zone->extra_dest);
 409                         fw3_ipt_rule_replace(r, "POSTROUTING");
 410                 }
 411         }
 412         else if (handle->table == FW3_TABLE_MANGLE)
 413         {
 414                 if (zone->mtu_fix)
 415                 {
 416                         if (zone->log)
 417                         {
 418                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 419
 420                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 421                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 422                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 423                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 424                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 425                                 fw3_ipt_rule_target(r, "LOG");
 426                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 427                                 fw3_ipt_rule_replace(r, "FORWARD");
 428                         }
 429
 430                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 431                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 432                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 433                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 434                         fw3_ipt_rule_target(r, "TCPMSS");
 435                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 436                         fw3_ipt_rule_replace(r, "FORWARD");
 437                 }
 438         }
 439         else if (handle->table == FW3_TABLE_RAW)
 440         {
 441                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 442                 {
 443                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 444                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 445                         fw3_ipt_rule_extra(r, zone->extra_src);
 446                         fw3_ipt_rule_replace(r, "PREROUTING");
 447                 }
 448         }
 449 }
 450
 451 static void
 452 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 453                       bool reload, struct fw3_zone *zone)
 454 {
 455         struct fw3_device *dev;
 456         struct fw3_address *sub;
 457
 458         fw3_foreach(dev, &zone->devices)
 459         fw3_foreach(sub, &zone->subnets)
 460         {
 461                 if (!fw3_is_family(sub, handle->family))
 462                         continue;
 463
 464                 if (!dev && !sub)
 465                         continue;
 466
 467                 print_interface_rule(handle, state, reload, zone, dev, sub);
 468         }
 469 }
 470
 471 static struct fw3_address *
 472 next_addr(struct fw3_address *addr, struct list_head *list,
 473                 enum fw3_family family, bool invert)
 474 {
 475         struct list_head *p;
 476         struct fw3_address *rv;
 477
 478         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 479         {
 480                 rv = list_entry(p, struct fw3_address, list);
 481
 482                 if (fw3_is_family(rv, family) && rv->invert == invert)
 483                         return rv;
 484         }
 485
 486         return NULL;
 487 }
 488
 489 static void
 490 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 491                 bool reload, struct fw3_zone *zone)
 492 {
 493         bool first_src, first_dest;
 494         struct fw3_address *msrc;
 495         struct fw3_address *mdest;
 496         struct fw3_ipt_rule *r;
 497
 498         enum fw3_flag t;
 499         char buf[32];
 500
 501         if (!fw3_is_family(zone, handle->family))
 502                 return;
 503
 504         switch (handle->table)
 505         {
 506         case FW3_TABLE_FILTER:
 507                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 508                 {
 509                         r = fw3_ipt_rule_new(handle);
 510                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 511                         fw3_ipt_rule_comment(r, "Accept port redirections");
 512                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 513                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 514
 515                         r = fw3_ipt_rule_new(handle);
 516                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 517                         fw3_ipt_rule_comment(r, "Accept port forwards");
 518                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 519                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 520                 }
 521
 522                 r = fw3_ipt_rule_new(handle);
 523                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 524                                      fw3_flag_names[zone->policy_input]);
 525                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 526
 527                 r = fw3_ipt_rule_new(handle);
 528                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 529                                      fw3_flag_names[zone->policy_forward]);
 530                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 531
 532                 r = fw3_ipt_rule_new(handle);
 533                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 534                                      fw3_flag_names[zone->policy_output]);
 535                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 536
 537                 if (zone->log)
 538                 {
 539                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 540                         {
 541                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 542                                 {
 543                                         r = fw3_ipt_rule_new(handle);
 544
 545                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 546                                                  fw3_flag_names[t], zone->name);
 547
 548                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 549                                         fw3_ipt_rule_target(r, "LOG");
 550                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 551                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 552                                                             zone->name, fw3_flag_names[t]);
 553                                 }
 554
 555                                 if (has(zone->flags, handle->family, t))
 556                                 {
 557                                         r = fw3_ipt_rule_new(handle);
 558
 559                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 560                                                  fw3_flag_names[t], zone->name);
 561
 562                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 563                                         fw3_ipt_rule_target(r, "LOG");
 564                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 565                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 566                                                             zone->name, fw3_flag_names[t]);
 567                                 }
 568                         }
 569                 }
 570                 break;
 571
 572         case FW3_TABLE_NAT:
 573                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 574                 {
 575                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 576                         for (msrc = NULL;
 577                              (msrc = next_addr(msrc, &zone->masq_src,
 578                                                handle->family, true)) != NULL; )
 579                         {
 580                                 msrc->invert = false;
 581                                 r = fw3_ipt_rule_new(handle);
 582                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 583                                 fw3_ipt_rule_target(r, "RETURN");
 584                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 585                                 msrc->invert = true;
 586                         }
 587
 588                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 589                         for (mdest = NULL;
 590                              (mdest = next_addr(mdest, &zone->masq_dest,
 591                                                 handle->family, true)) != NULL; )
 592                         {
 593                                 mdest->invert = false;
 594                                 r = fw3_ipt_rule_new(handle);
 595                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 596                                 fw3_ipt_rule_target(r, "RETURN");
 597                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 598                                 mdest->invert = true;
 599                         }
 600
 601                         /* emit masquerading entries for non-negated addresses
 602                            and ensure that both src and dest loops run at least once,
 603                            even if there are no relevant addresses */
 604                         for (first_src = true, msrc = NULL;
 605                              (msrc = next_addr(msrc, &zone->masq_src,
 606                                                    handle->family, false)) || first_src;
 607                              first_src = false)
 608                         {
 609                                 for (first_dest = true, mdest = NULL;
 610                                      (mdest = next_addr(mdest, &zone->masq_dest,
 611                                                             handle->family, false)) || first_dest;
 612                                      first_dest = false)
 613                                 {
 614                                         r = fw3_ipt_rule_new(handle);
 615                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 616                                         fw3_ipt_rule_target(r, "MASQUERADE");
 617                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 618                                 }
 619                         }
 620                 }
 621                 break;
 622
 623         case FW3_TABLE_RAW:
 624         case FW3_TABLE_MANGLE:
 625                 break;
 626         }
 627
 628         print_interface_rules(handle, state, reload, zone);
 629 }
 630
 631 void
 632 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 633                       bool reload)
 634 {
 635         struct fw3_zone *zone;
 636
 637         list_for_each_entry(zone, &state->zones, list)
 638                 print_zone_chain(handle, state, reload, zone);
 639 }
 640
 641 void
 642 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 643                      bool reload)
 644 {
 645         struct fw3_zone *zone;
 646
 647         list_for_each_entry(zone, &state->zones, list)
 648                 print_zone_rule(handle, state, reload, zone);
 649 }
 650
 651 void
 652 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 653                 bool reload)
 654 {
 655         struct fw3_zone *z, *tmp;
 656         const struct fw3_chain_spec *c;
 657         char chain[32];
 658
 659         list_for_each_entry_safe(z, tmp, &state->zones, list)
 660         {
 661                 if (!has(z->flags, handle->family, handle->table))
 662                         continue;
 663
 664                 for (c = zone_chains; c->format; c++)
 665                 {
 666                         /* don't touch user chains on selective stop */
 667                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 668                                 continue;
 669
 670                         if (!fw3_is_family(c, handle->family))
 671                                 continue;
 672
 673                         if (c->table != handle->table)
 674                                 continue;
 675
 676                         if (c->flag && !has(z->flags, handle->family, c->flag))
 677                                 continue;
 678
 679                         snprintf(chain, sizeof(chain), c->format, z->name);
 680                         fw3_ipt_flush_chain(handle, chain);
 681
 682                         /* keep certain basic chains that do not depend on any settings to
 683                            avoid purging unrelated user rules pointing to them */
 684                         if (reload && !c->flag)
 685                                 continue;
 686
 687                         fw3_ipt_delete_chain(handle, chain);
 688                 }
 689
 690                 del(z->flags, handle->family, handle->table);
 691         }
 692 }
 693
 694 void
 695 fw3_hotplug_zones(struct fw3_state *state, bool add)
 696 {
 697         struct fw3_zone *z;
 698         struct fw3_device *d;
 699
 700         list_for_each_entry(z, &state->zones, list)
 701         {
 702                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 703                 {
 704                         list_for_each_entry(d, &z->devices, list)
 705                                 fw3_hotplug(add, z, d);
 706
 707                         if (add)
 708                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 709                         else
 710                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 711                 }
 712         }
 713 }
 714
 715 struct fw3_zone *
 716 fw3_lookup_zone(struct fw3_state *state, const char *name)
 717 {
 718         struct fw3_zone *z;
 719
 720         if (list_empty(&state->zones))
 721                 return NULL;
 722
 723         list_for_each_entry(z, &state->zones, list)
 724         {
 725                 if (strcmp(z->name, name))
 726                         continue;
 727
 728                 return z;
 729         }
 730
 731         return NULL;
 732 }
 733
 734 struct list_head *
 735 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 736 {
 737         struct fw3_device *net;
 738         struct fw3_address *cur, *tmp;
 739         struct list_head *all;
 740
 741         all = calloc(1, sizeof(*all));
 742         if (!all)
 743                 return NULL;
 744
 745         INIT_LIST_HEAD(all);
 746
 747         if (addr && addr->set)
 748         {
 749                 tmp = malloc(sizeof(*tmp));
 750
 751                 if (tmp)
 752                 {
 753                         *tmp = *addr;
 754                         list_add_tail(&tmp->list, all);
 755                 }
 756         }
 757         else
 758         {
 759                 list_for_each_entry(net, &zone->networks, list)
 760                         fw3_ubus_address(all, net->name);
 761
 762                 list_for_each_entry(cur, &zone->subnets, list)
 763                 {
 764                         tmp = malloc(sizeof(*tmp));
 765
 766                         if (!tmp)
 767                                 continue;
 768
 769                         *tmp = *cur;
 770                         list_add_tail(&tmp->list, all);
 771                 }
 772         }
 773
 774         return all;
 775 }