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("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         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                         zone->conntrack = true;
 221                 }
 222
 223                 if (zone->custom_chains)
 224                 {
 225                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 226                         fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
 227                 }
 228
 229                 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 230                 fw3_setbit(zone->flags[0], zone->policy_forward);
 231                 fw3_setbit(zone->flags[0], zone->policy_output);
 232
 233                 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 234                 fw3_setbit(zone->flags[1], zone->policy_forward);
 235                 fw3_setbit(zone->flags[1], zone->policy_output);
 236
 237                 list_add_tail(&zone->list, &state->zones);
 238         }
 239 }
 240
 241
 242 static void
 243 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 244                  bool reload, struct fw3_zone *zone)
 245 {
 246         int i;
 247         struct fw3_ipt_rule *r;
 248         const struct fw3_chain_spec *c;
 249
 250         const char *flt_chains[] = {
 251                 "input",   "input",
 252                 "output",  "output",
 253                 "forward", "forwarding",
 254         };
 255
 256         const char *nat_chains[] = {
 257                 "prerouting",  "prerouting",
 258                 "postrouting", "postrouting",
 259         };
 260
 261         if (!fw3_is_family(zone, handle->family))
 262                 return;
 263
 264         info("   * Zone '%s'", zone->name);
 265
 266         set(zone->flags, handle->family, handle->table);
 267
 268         if (zone->custom_chains)
 269                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 270
 271         if (!zone->conntrack && !state->defaults.drop_invalid)
 272                 set(zone->flags, handle->family, FW3_FLAG_NOTRACK);
 273
 274         for (c = zone_chains; c->format; c++)
 275         {
 276                 /* don't touch user chains on selective stop */
 277                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 278                         continue;
 279
 280                 if (!fw3_is_family(c, handle->family))
 281                         continue;
 282
 283                 if (c->table != handle->table)
 284                         continue;
 285
 286                 if (c->flag &&
 287                     !fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 288                         continue;
 289
 290                 fw3_ipt_create_chain(handle, c->format, zone->name);
 291         }
 292
 293         if (zone->custom_chains)
 294         {
 295                 if (handle->table == FW3_TABLE_FILTER)
 296                 {
 297                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 298                         {
 299                                 r = fw3_ipt_rule_new(handle);
 300                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 301                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 302                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 303                         }
 304                 }
 305                 else if (handle->table == FW3_TABLE_NAT)
 306                 {
 307                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 308                         {
 309                                 r = fw3_ipt_rule_new(handle);
 310                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 311                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 312                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 313                         }
 314                 }
 315         }
 316
 317         set(zone->flags, handle->family, handle->table);
 318 }
 319
 320 static void
 321 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 322                                          bool reload, struct fw3_zone *zone,
 323                      struct fw3_device *dev, struct fw3_address *sub)
 324 {
 325         struct fw3_protocol tcp = { .protocol = 6 };
 326         struct fw3_ipt_rule *r;
 327         enum fw3_flag t;
 328
 329         char buf[32];
 330
 331         int i;
 332
 333         const char *chains[] = {
 334                 "input", "INPUT",
 335                 "output", "OUTPUT",
 336                 "forward", "FORWARD",
 337         };
 338
 339 #define jump_target(t) \
 340         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 341
 342         if (handle->table == FW3_TABLE_FILTER)
 343         {
 344                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 345                 {
 346                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 347                         {
 348                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 349                                 fw3_ipt_rule_target(r, jump_target(t));
 350                                 fw3_ipt_rule_extra(r, zone->extra_src);
 351
 352                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 353                                         fw3_ipt_rule_extra(r,
 354                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 355
 356                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 357                                                      fw3_flag_names[t]);
 358                         }
 359
 360                         if (has(zone->flags, handle->family, t))
 361                         {
 362                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 363                                 fw3_ipt_rule_target(r, jump_target(t));
 364                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 365
 366                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 367                                         fw3_ipt_rule_extra(r,
 368                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 369
 370                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 371                                                      fw3_flag_names[t]);
 372                         }
 373                 }
 374
 375                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 376                 {
 377                         if (*chains[i] == 'o')
 378                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 379                         else
 380                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 381
 382                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 383
 384                         if (*chains[i] == 'o')
 385                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 386                         else
 387                                 fw3_ipt_rule_extra(r, zone->extra_src);
 388
 389                         fw3_ipt_rule_replace(r, chains[i + 1]);
 390                 }
 391         }
 392         else if (handle->table == FW3_TABLE_NAT)
 393         {
 394                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 395                 {
 396                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 397                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 398                         fw3_ipt_rule_extra(r, zone->extra_src);
 399                         fw3_ipt_rule_replace(r, "PREROUTING");
 400                 }
 401
 402                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 403                 {
 404                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 405                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 406                         fw3_ipt_rule_extra(r, zone->extra_dest);
 407                         fw3_ipt_rule_replace(r, "POSTROUTING");
 408                 }
 409         }
 410         else if (handle->table == FW3_TABLE_MANGLE)
 411         {
 412                 if (zone->mtu_fix)
 413                 {
 414                         if (zone->log)
 415                         {
 416                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 417
 418                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 419                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 420                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 421                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 422                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 423                                 fw3_ipt_rule_target(r, "LOG");
 424                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 425                                 fw3_ipt_rule_replace(r, "FORWARD");
 426                         }
 427
 428                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 429                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 430                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 431                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 432                         fw3_ipt_rule_target(r, "TCPMSS");
 433                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 434                         fw3_ipt_rule_replace(r, "FORWARD");
 435                 }
 436         }
 437         else if (handle->table == FW3_TABLE_RAW)
 438         {
 439                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 440                 {
 441                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 442                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 443                         fw3_ipt_rule_extra(r, zone->extra_src);
 444                         fw3_ipt_rule_replace(r, "PREROUTING");
 445                 }
 446         }
 447 }
 448
 449 static void
 450 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 451                       bool reload, struct fw3_zone *zone)
 452 {
 453         struct fw3_device *dev;
 454         struct fw3_address *sub;
 455
 456         fw3_foreach(dev, &zone->devices)
 457         fw3_foreach(sub, &zone->subnets)
 458         {
 459                 if (!fw3_is_family(sub, handle->family))
 460                         continue;
 461
 462                 if (!dev && !sub)
 463                         continue;
 464
 465                 print_interface_rule(handle, state, reload, zone, dev, sub);
 466         }
 467 }
 468
 469 static struct fw3_address *
 470 next_addr(struct fw3_address *addr, struct list_head *list,
 471                 enum fw3_family family, bool invert)
 472 {
 473         struct list_head *p;
 474         struct fw3_address *rv;
 475
 476         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 477         {
 478                 rv = list_entry(p, struct fw3_address, list);
 479
 480                 if (fw3_is_family(rv, family) && rv->invert == invert)
 481                         return rv;
 482         }
 483
 484         return NULL;
 485 }
 486
 487 static void
 488 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 489                 bool reload, struct fw3_zone *zone)
 490 {
 491         bool disable_notrack = state->defaults.drop_invalid;
 492         bool first_src, first_dest;
 493         struct fw3_address *msrc;
 494         struct fw3_address *mdest;
 495         struct fw3_ipt_rule *r;
 496
 497         enum fw3_flag t;
 498         char buf[32];
 499
 500         if (!fw3_is_family(zone, handle->family))
 501                 return;
 502
 503         switch (handle->table)
 504         {
 505         case FW3_TABLE_FILTER:
 506                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 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 redirections");
 511                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 512                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 513
 514                         r = fw3_ipt_rule_new(handle);
 515                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 516                         fw3_ipt_rule_comment(r, "Accept port forwards");
 517                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 518                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 519                 }
 520
 521                 r = fw3_ipt_rule_new(handle);
 522                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 523                                      fw3_flag_names[zone->policy_input]);
 524                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 525
 526                 r = fw3_ipt_rule_new(handle);
 527                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 528                                      fw3_flag_names[zone->policy_forward]);
 529                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 530
 531                 r = fw3_ipt_rule_new(handle);
 532                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 533                                      fw3_flag_names[zone->policy_output]);
 534                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 535
 536                 if (zone->log)
 537                 {
 538                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 539                         {
 540                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 541                                 {
 542                                         r = fw3_ipt_rule_new(handle);
 543
 544                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 545                                                  fw3_flag_names[t], zone->name);
 546
 547                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 548                                         fw3_ipt_rule_target(r, "LOG");
 549                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 550                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 551                                                             zone->name, fw3_flag_names[t]);
 552                                 }
 553
 554                                 if (has(zone->flags, handle->family, t))
 555                                 {
 556                                         r = fw3_ipt_rule_new(handle);
 557
 558                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 559                                                  fw3_flag_names[t], zone->name);
 560
 561                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 562                                         fw3_ipt_rule_target(r, "LOG");
 563                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 564                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 565                                                             zone->name, fw3_flag_names[t]);
 566                                 }
 567                         }
 568                 }
 569                 break;
 570
 571         case FW3_TABLE_NAT:
 572                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 573                 {
 574                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 575                         for (msrc = NULL;
 576                              (msrc = next_addr(msrc, &zone->masq_src,
 577                                                handle->family, true)) != NULL; )
 578                         {
 579                                 msrc->invert = false;
 580                                 r = fw3_ipt_rule_new(handle);
 581                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 582                                 fw3_ipt_rule_target(r, "RETURN");
 583                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 584                                 msrc->invert = true;
 585                         }
 586
 587                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 588                         for (mdest = NULL;
 589                              (mdest = next_addr(mdest, &zone->masq_dest,
 590                                                 handle->family, true)) != NULL; )
 591                         {
 592                                 mdest->invert = false;
 593                                 r = fw3_ipt_rule_new(handle);
 594                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 595                                 fw3_ipt_rule_target(r, "RETURN");
 596                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 597                                 mdest->invert = true;
 598                         }
 599
 600                         /* emit masquerading entries for non-negated addresses
 601                            and ensure that both src and dest loops run at least once,
 602                            even if there are no relevant addresses */
 603                         for (first_src = true, msrc = NULL;
 604                              (msrc = next_addr(msrc, &zone->masq_src,
 605                                                    handle->family, false)) || first_src;
 606                              first_src = false)
 607                         {
 608                                 for (first_dest = true, mdest = NULL;
 609                                      (mdest = next_addr(mdest, &zone->masq_dest,
 610                                                             handle->family, false)) || first_dest;
 611                                      first_dest = false)
 612                                 {
 613                                         r = fw3_ipt_rule_new(handle);
 614                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 615                                         fw3_ipt_rule_target(r, "MASQUERADE");
 616                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 617                                 }
 618                         }
 619                 }
 620                 break;
 621
 622         case FW3_TABLE_RAW:
 623                 if (!zone->conntrack && !disable_notrack)
 624                 {
 625                         r = fw3_ipt_rule_new(handle);
 626                         fw3_ipt_rule_target(r, "CT");
 627                         fw3_ipt_rule_addarg(r, false, "--notrack", NULL);
 628                         fw3_ipt_rule_append(r, "zone_%s_notrack", zone->name);
 629                 }
 630                 break;
 631
 632         case FW3_TABLE_MANGLE:
 633                 break;
 634         }
 635
 636         print_interface_rules(handle, state, reload, zone);
 637 }
 638
 639 void
 640 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 641                       bool reload)
 642 {
 643         struct fw3_zone *zone;
 644
 645         list_for_each_entry(zone, &state->zones, list)
 646                 print_zone_chain(handle, state, reload, zone);
 647 }
 648
 649 void
 650 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 651                      bool reload)
 652 {
 653         struct fw3_zone *zone;
 654
 655         list_for_each_entry(zone, &state->zones, list)
 656                 print_zone_rule(handle, state, reload, zone);
 657 }
 658
 659 void
 660 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 661                 bool reload)
 662 {
 663         struct fw3_zone *z, *tmp;
 664         const struct fw3_chain_spec *c;
 665         char chain[32];
 666
 667         list_for_each_entry_safe(z, tmp, &state->zones, list)
 668         {
 669                 if (!has(z->flags, handle->family, handle->table))
 670                         continue;
 671
 672                 for (c = zone_chains; c->format; c++)
 673                 {
 674                         /* don't touch user chains on selective stop */
 675                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 676                                 continue;
 677
 678                         if (!fw3_is_family(c, handle->family))
 679                                 continue;
 680
 681                         if (c->table != handle->table)
 682                                 continue;
 683
 684                         if (c->flag && !has(z->flags, handle->family, c->flag))
 685                                 continue;
 686
 687                         snprintf(chain, sizeof(chain), c->format, z->name);
 688                         fw3_ipt_flush_chain(handle, chain);
 689
 690                         /* keep certain basic chains that do not depend on any settings to
 691                            avoid purging unrelated user rules pointing to them */
 692                         if (reload && !c->flag)
 693                                 continue;
 694
 695                         fw3_ipt_delete_chain(handle, chain);
 696                 }
 697
 698                 del(z->flags, handle->family, handle->table);
 699         }
 700 }
 701
 702 void
 703 fw3_hotplug_zones(struct fw3_state *state, bool add)
 704 {
 705         struct fw3_zone *z;
 706         struct fw3_device *d;
 707
 708         list_for_each_entry(z, &state->zones, list)
 709         {
 710                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 711                 {
 712                         list_for_each_entry(d, &z->devices, list)
 713                                 fw3_hotplug(add, z, d);
 714
 715                         if (add)
 716                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 717                         else
 718                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 719                 }
 720         }
 721 }
 722
 723 struct fw3_zone *
 724 fw3_lookup_zone(struct fw3_state *state, const char *name)
 725 {
 726         struct fw3_zone *z;
 727
 728         if (list_empty(&state->zones))
 729                 return NULL;
 730
 731         list_for_each_entry(z, &state->zones, list)
 732         {
 733                 if (strcmp(z->name, name))
 734                         continue;
 735
 736                 return z;
 737         }
 738
 739         return NULL;
 740 }
 741
 742 struct list_head *
 743 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 744 {
 745         struct fw3_device *net;
 746         struct fw3_address *cur, *tmp;
 747         struct list_head *all;
 748
 749         all = calloc(1, sizeof(*all));
 750         if (!all)
 751                 return NULL;
 752
 753         INIT_LIST_HEAD(all);
 754
 755         if (addr && addr->set)
 756         {
 757                 tmp = malloc(sizeof(*tmp));
 758
 759                 if (tmp)
 760                 {
 761                         *tmp = *addr;
 762                         list_add_tail(&tmp->list, all);
 763                 }
 764         }
 765         else
 766         {
 767                 list_for_each_entry(net, &zone->networks, list)
 768                         fw3_ubus_address(all, net->name);
 769
 770                 list_for_each_entry(cur, &zone->subnets, list)
 771                 {
 772                         tmp = malloc(sizeof(*tmp));
 773
 774                         if (!tmp)
 775                                 continue;
 776
 777                         *tmp = *cur;
 778                         list_add_tail(&tmp->list, all);
 779                 }
 780         }
 781
 782         return all;
 783 }