zones.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "zones.h"
  20 #include "ubus.h"
  21
  22
  23 #define C(f, tbl, tgt, fmt) \
  24         { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
  25
  26 static const struct fw3_chain_spec zone_chains[] = {
  27         C(ANY, FILTER, UNSPEC,        "zone_%s_input"),
  28         C(ANY, FILTER, UNSPEC,        "zone_%s_output"),
  29         C(ANY, FILTER, UNSPEC,        "zone_%s_forward"),
  30
  31         C(ANY, FILTER, SRC_ACCEPT,    "zone_%s_src_ACCEPT"),
  32         C(ANY, FILTER, SRC_REJECT,    "zone_%s_src_REJECT"),
  33         C(ANY, FILTER, SRC_DROP,      "zone_%s_src_DROP"),
  34
  35         C(ANY, FILTER, ACCEPT,        "zone_%s_dest_ACCEPT"),
  36         C(ANY, FILTER, REJECT,        "zone_%s_dest_REJECT"),
  37         C(ANY, FILTER, DROP,          "zone_%s_dest_DROP"),
  38
  39         C(V4,  NAT,    SNAT,          "zone_%s_postrouting"),
  40         C(V4,  NAT,    DNAT,          "zone_%s_prerouting"),
  41
  42         C(ANY, RAW,    NOTRACK,       "zone_%s_notrack"),
  43
  44         C(ANY, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
  45         C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
  46         C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
  47
  48         C(V4,  NAT,    CUSTOM_CHAINS, "prerouting_%s_rule"),
  49         C(V4,  NAT,    CUSTOM_CHAINS, "postrouting_%s_rule"),
  50
  51         { }
  52 };
  53
  54 const struct fw3_option fw3_zone_opts[] = {
  55         FW3_OPT("enabled",             bool,     zone,     enabled),
  56
  57         FW3_OPT("name",                string,   zone,     name),
  58         FW3_OPT("family",              family,   zone,     family),
  59
  60         FW3_LIST("network",            device,   zone,     networks),
  61         FW3_LIST("device",             device,   zone,     devices),
  62         FW3_LIST("subnet",             network,  zone,     subnets),
  63
  64         FW3_OPT("input",               target,   zone,     policy_input),
  65         FW3_OPT("forward",             target,   zone,     policy_forward),
  66         FW3_OPT("output",              target,   zone,     policy_output),
  67
  68         FW3_OPT("masq",                bool,     zone,     masq),
  69         FW3_LIST("masq_src",           network,  zone,     masq_src),
  70         FW3_LIST("masq_dest",          network,  zone,     masq_dest),
  71
  72         FW3_OPT("extra",               string,   zone,     extra_src),
  73         FW3_OPT("extra_src",           string,   zone,     extra_src),
  74         FW3_OPT("extra_dest",          string,   zone,     extra_dest),
  75
  76         FW3_OPT("conntrack",           bool,     zone,     conntrack),
  77         FW3_OPT("mtu_fix",             bool,     zone,     mtu_fix),
  78         FW3_OPT("custom_chains",       bool,     zone,     custom_chains),
  79
  80         FW3_OPT("log",                 bool,     zone,     log),
  81         FW3_OPT("log_limit",           limit,    zone,     log_limit),
  82
  83         FW3_OPT("__flags_v4",          int,      zone,     flags[0]),
  84         FW3_OPT("__flags_v6",          int,      zone,     flags[1]),
  85
  86         { }
  87 };
  88
  89
  90 static void
  91 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
  92              const char *name)
  93 {
  94         if (*pol == FW3_FLAG_UNSPEC)
  95         {
  96                 warn_elem(e, "has no %s policy specified, using default", name);
  97                 *pol = def;
  98         }
  99         else if (*pol > FW3_FLAG_DROP)
 100         {
 101                 warn_elem(e, "has invalid %s policy, using default", name);
 102                 *pol = def;
 103         }
 104 }
 105
 106 static void
 107 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
 108 {
 109         struct fw3_device *net, *tmp;
 110
 111         list_for_each_entry(net, &zone->networks, list)
 112         {
 113                 tmp = fw3_ubus_device(net->name);
 114
 115                 if (!tmp)
 116                 {
 117                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
 118                         continue;
 119                 }
 120
 121                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
 122                 list_add_tail(&tmp->list, &zone->devices);
 123         }
 124 }
 125
 126 struct fw3_zone *
 127 fw3_alloc_zone(void)
 128 {
 129         struct fw3_zone *zone;
 130
 131         zone = malloc(sizeof(*zone));
 132
 133         if (!zone)
 134                 return NULL;
 135
 136         memset(zone, 0, sizeof(*zone));
 137
 138         INIT_LIST_HEAD(&zone->networks);
 139         INIT_LIST_HEAD(&zone->devices);
 140         INIT_LIST_HEAD(&zone->subnets);
 141         INIT_LIST_HEAD(&zone->masq_src);
 142         INIT_LIST_HEAD(&zone->masq_dest);
 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                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 219                         zone->conntrack = true;
 220                 }
 221
 222                 if (zone->custom_chains)
 223                 {
 224                         setbit(zone->flags[0], FW3_FLAG_SNAT);
 225                         setbit(zone->flags[0], FW3_FLAG_DNAT);
 226                 }
 227
 228                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 229                 setbit(zone->flags[0], fw3_to_src_target(zone->policy_forward));
 230                 setbit(zone->flags[0], zone->policy_output);
 231
 232                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 233                 setbit(zone->flags[1], fw3_to_src_target(zone->policy_forward));
 234                 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         if (!zone->conntrack && !state->defaults.drop_invalid)
 271                 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
 272
 273         for (c = zone_chains; c->format; c++)
 274         {
 275                 /* don't touch user chains on selective stop */
 276                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 277                         continue;
 278
 279                 if (!fw3_is_family(c, handle->family))
 280                         continue;
 281
 282                 if (c->table != handle->table)
 283                         continue;
 284
 285                 if (c->flag &&
 286                     !hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 287                         continue;
 288
 289                 fw3_ipt_create_chain(handle, c->format, zone->name);
 290         }
 291
 292         if (zone->custom_chains)
 293         {
 294                 if (handle->table == FW3_TABLE_FILTER)
 295                 {
 296                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 297                         {
 298                                 r = fw3_ipt_rule_new(handle);
 299                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 300                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 301                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 302                         }
 303                 }
 304                 else if (handle->table == FW3_TABLE_NAT)
 305                 {
 306                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 307                         {
 308                                 r = fw3_ipt_rule_new(handle);
 309                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 310                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 311                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 312                         }
 313                 }
 314         }
 315
 316         set(zone->flags, handle->family, handle->table);
 317 }
 318
 319 static void
 320 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 321                                          bool reload, struct fw3_zone *zone,
 322                      struct fw3_device *dev, struct fw3_address *sub)
 323 {
 324         struct fw3_protocol tcp = { .protocol = 6 };
 325         struct fw3_ipt_rule *r;
 326         enum fw3_flag t;
 327
 328         char buf[32];
 329
 330         int i;
 331
 332         const char *chains[] = {
 333                 "input",
 334                 "output",
 335                 "forward",
 336         };
 337
 338 #define jump_target(t) \
 339         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 340
 341         if (handle->table == FW3_TABLE_FILTER)
 342         {
 343                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 344                 {
 345                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 346                         {
 347                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 348                                 fw3_ipt_rule_target(r, jump_target(t));
 349                                 fw3_ipt_rule_extra(r, zone->extra_src);
 350                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 351                                                      fw3_flag_names[t]);
 352                         }
 353
 354                         if (has(zone->flags, handle->family, t))
 355                         {
 356                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 357                                 fw3_ipt_rule_target(r, jump_target(t));
 358                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 359                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 360                                                      fw3_flag_names[t]);
 361                         }
 362                 }
 363
 364                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i++)
 365                 {
 366                         if (*chains[i] == 'o')
 367                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 368                         else
 369                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 370
 371                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 372
 373                         if (*chains[i] == 'o')
 374                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 375                         else
 376                                 fw3_ipt_rule_extra(r, zone->extra_src);
 377
 378                         fw3_ipt_rule_replace(r, "delegate_%s", chains[i]);
 379                 }
 380         }
 381         else if (handle->table == FW3_TABLE_NAT)
 382         {
 383                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 384                 {
 385                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 386                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 387                         fw3_ipt_rule_extra(r, zone->extra_src);
 388                         fw3_ipt_rule_replace(r, "delegate_prerouting");
 389                 }
 390
 391                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 392                 {
 393                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 394                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 395                         fw3_ipt_rule_extra(r, zone->extra_dest);
 396                         fw3_ipt_rule_replace(r, "delegate_postrouting");
 397                 }
 398         }
 399         else if (handle->table == FW3_TABLE_MANGLE)
 400         {
 401                 if (zone->mtu_fix)
 402                 {
 403                         if (zone->log)
 404                         {
 405                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 406
 407                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 408                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 409                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 410                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 411                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 412                                 fw3_ipt_rule_target(r, "LOG");
 413                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 414                                 fw3_ipt_rule_replace(r, "mssfix");
 415                         }
 416
 417                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 418                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 419                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 420                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 421                         fw3_ipt_rule_target(r, "TCPMSS");
 422                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 423                         fw3_ipt_rule_replace(r, "mssfix");
 424                 }
 425         }
 426         else if (handle->table == FW3_TABLE_RAW)
 427         {
 428                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 429                 {
 430                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 431                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 432                         fw3_ipt_rule_extra(r, zone->extra_src);
 433                         fw3_ipt_rule_replace(r, "delegate_notrack");
 434                 }
 435         }
 436 }
 437
 438 static void
 439 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 440                       bool reload, struct fw3_zone *zone)
 441 {
 442         struct fw3_device *dev;
 443         struct fw3_address *sub;
 444
 445         fw3_foreach(dev, &zone->devices)
 446         fw3_foreach(sub, &zone->subnets)
 447         {
 448                 if (!fw3_is_family(sub, handle->family))
 449                         continue;
 450
 451                 if (!dev && !sub)
 452                         continue;
 453
 454                 print_interface_rule(handle, state, reload, zone, dev, sub);
 455         }
 456 }
 457
 458 static void
 459 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 460                 bool reload, struct fw3_zone *zone)
 461 {
 462         bool disable_notrack = state->defaults.drop_invalid;
 463         struct fw3_address *msrc;
 464         struct fw3_address *mdest;
 465         struct fw3_ipt_rule *r;
 466
 467         enum fw3_flag t;
 468         char buf[32];
 469
 470         if (!fw3_is_family(zone, handle->family))
 471                 return;
 472
 473         switch (handle->table)
 474         {
 475         case FW3_TABLE_FILTER:
 476                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 477                 {
 478                         r = fw3_ipt_rule_new(handle);
 479                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 480                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 481                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 482
 483                         r = fw3_ipt_rule_new(handle);
 484                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 485                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 486                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 487                 }
 488
 489                 r = fw3_ipt_rule_new(handle);
 490                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 491                                      fw3_flag_names[zone->policy_input]);
 492                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 493
 494                 r = fw3_ipt_rule_new(handle);
 495                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 496                                      fw3_flag_names[zone->policy_forward]);
 497                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 498
 499                 r = fw3_ipt_rule_new(handle);
 500                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 501                                      fw3_flag_names[zone->policy_output]);
 502                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 503
 504                 if (zone->log)
 505                 {
 506                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 507                         {
 508                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 509                                 {
 510                                         r = fw3_ipt_rule_new(handle);
 511
 512                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 513                                                  fw3_flag_names[t], zone->name);
 514
 515                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 516                                         fw3_ipt_rule_target(r, "LOG");
 517                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 518                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 519                                                             zone->name, fw3_flag_names[t]);
 520                                 }
 521
 522                                 if (has(zone->flags, handle->family, t))
 523                                 {
 524                                         r = fw3_ipt_rule_new(handle);
 525
 526                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 527                                                  fw3_flag_names[t], zone->name);
 528
 529                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 530                                         fw3_ipt_rule_target(r, "LOG");
 531                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 532                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 533                                                             zone->name, fw3_flag_names[t]);
 534                                 }
 535                         }
 536                 }
 537                 break;
 538
 539         case FW3_TABLE_NAT:
 540                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 541                 {
 542                         fw3_foreach(msrc, &zone->masq_src)
 543                         fw3_foreach(mdest, &zone->masq_dest)
 544                         {
 545                                 if (!fw3_is_family(msrc, handle->family) ||
 546                                     !fw3_is_family(mdest, handle->family))
 547                                         continue;
 548
 549                                 r = fw3_ipt_rule_new(handle);
 550                                 fw3_ipt_rule_src_dest(r, msrc, mdest);
 551                                 fw3_ipt_rule_target(r, "MASQUERADE");
 552                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 553                         }
 554                 }
 555                 break;
 556
 557         case FW3_TABLE_RAW:
 558                 if (!zone->conntrack && !disable_notrack)
 559                 {
 560                         r = fw3_ipt_rule_new(handle);
 561                         fw3_ipt_rule_target(r, "CT");
 562                         fw3_ipt_rule_addarg(r, false, "--notrack", NULL);
 563                         fw3_ipt_rule_append(r, "zone_%s_notrack", zone->name);
 564                 }
 565                 break;
 566
 567         case FW3_TABLE_MANGLE:
 568                 break;
 569         }
 570
 571         print_interface_rules(handle, state, reload, zone);
 572 }
 573
 574 void
 575 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 576                       bool reload)
 577 {
 578         struct fw3_zone *zone;
 579
 580         list_for_each_entry(zone, &state->zones, list)
 581                 print_zone_chain(handle, state, reload, zone);
 582 }
 583
 584 void
 585 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 586                      bool reload)
 587 {
 588         struct fw3_zone *zone;
 589
 590         list_for_each_entry(zone, &state->zones, list)
 591                 print_zone_rule(handle, state, reload, zone);
 592 }
 593
 594 void
 595 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 596                 bool reload)
 597 {
 598         struct fw3_zone *z, *tmp;
 599         const struct fw3_chain_spec *c;
 600         char chain[32];
 601
 602         list_for_each_entry_safe(z, tmp, &state->zones, list)
 603         {
 604                 if (!has(z->flags, handle->family, handle->table))
 605                         continue;
 606
 607                 for (c = zone_chains; c->format; c++)
 608                 {
 609                         /* don't touch user chains on selective stop */
 610                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 611                                 continue;
 612
 613                         if (!fw3_is_family(c, handle->family))
 614                                 continue;
 615
 616                         if (c->table != handle->table)
 617                                 continue;
 618
 619                         if (c->flag && !has(z->flags, handle->family, c->flag))
 620                                 continue;
 621
 622                         snprintf(chain, sizeof(chain), c->format, z->name);
 623                         fw3_ipt_flush_chain(handle, chain);
 624
 625                         /* keep certain basic chains that do not depend on any settings to
 626                            avoid purging unrelated user rules pointing to them */
 627                         if (reload && !c->flag)
 628                                 continue;
 629
 630                         fw3_ipt_delete_chain(handle, chain);
 631                 }
 632
 633                 del(z->flags, handle->family, handle->table);
 634         }
 635 }
 636
 637 void
 638 fw3_hotplug_zones(struct fw3_state *state, bool add)
 639 {
 640         struct fw3_zone *z;
 641         struct fw3_device *d;
 642
 643         list_for_each_entry(z, &state->zones, list)
 644         {
 645                 if (add != hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 646                 {
 647                         list_for_each_entry(d, &z->devices, list)
 648                                 fw3_hotplug(add, z, d);
 649
 650                         if (add)
 651                                 setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 652                         else
 653                                 delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 654                 }
 655         }
 656 }
 657
 658 struct fw3_zone *
 659 fw3_lookup_zone(struct fw3_state *state, const char *name)
 660 {
 661         struct fw3_zone *z;
 662
 663         if (list_empty(&state->zones))
 664                 return NULL;
 665
 666         list_for_each_entry(z, &state->zones, list)
 667         {
 668                 if (strcmp(z->name, name))
 669                         continue;
 670
 671                 return z;
 672         }
 673
 674         return NULL;
 675 }
 676
 677 struct list_head *
 678 fw3_resolve_zone_addresses(struct fw3_zone *zone)
 679 {
 680         struct fw3_device *net;
 681         struct fw3_address *addr, *tmp;
 682         struct list_head *addrs, *all;
 683
 684         all = malloc(sizeof(*all));
 685
 686         if (!all)
 687                 return NULL;
 688
 689         memset(all, 0, sizeof(*all));
 690         INIT_LIST_HEAD(all);
 691
 692         list_for_each_entry(net, &zone->networks, list)
 693         {
 694                 addrs = fw3_ubus_address(net->name);
 695
 696                 if (!addrs)
 697                         continue;
 698
 699                 list_for_each_entry_safe(addr, tmp, addrs, list)
 700                 {
 701                         list_del(&addr->list);
 702                         list_add_tail(&addr->list, all);
 703                 }
 704
 705                 free(addrs);
 706         }
 707
 708         list_for_each_entry(addr, &zone->subnets, list)
 709         {
 710                 tmp = malloc(sizeof(*tmp));
 711
 712                 if (!tmp)
 713                         continue;
 714
 715                 memcpy(tmp, addr, sizeof(*tmp));
 716                 list_add_tail(&tmp->list, all);
 717         }
 718
 719         return all;
 720 }