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 bool
 109 check_masq_addrs(struct list_head *head)
 110 {
 111         struct fw3_address *addr;
 112         int n_addr = 0, n_failed = 0;
 113
 114         list_for_each_entry(addr, head, list)
 115         {
 116                 if (addr->invert)
 117                         continue;
 118
 119                 n_addr++;
 120
 121                 if (!addr->set && addr->resolved)
 122                         n_failed++;
 123         }
 124
 125         return (n_addr == 0 || n_failed < n_addr);
 126 }
 127
 128 static void
 129 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
 130 {
 131         struct fw3_device *net, *tmp;
 132
 133         list_for_each_entry(net, &zone->networks, list)
 134         {
 135                 tmp = fw3_ubus_device(net->name);
 136
 137                 if (!tmp)
 138                 {
 139                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
 140                         continue;
 141                 }
 142
 143                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
 144                 list_add_tail(&tmp->list, &zone->devices);
 145         }
 146 }
 147
 148 struct fw3_zone *
 149 fw3_alloc_zone(void)
 150 {
 151         struct fw3_zone *zone;
 152
 153         zone = calloc(1, sizeof(*zone));
 154         if (!zone)
 155                 return NULL;
 156
 157         INIT_LIST_HEAD(&zone->networks);
 158         INIT_LIST_HEAD(&zone->devices);
 159         INIT_LIST_HEAD(&zone->subnets);
 160         INIT_LIST_HEAD(&zone->masq_src);
 161         INIT_LIST_HEAD(&zone->masq_dest);
 162
 163         INIT_LIST_HEAD(&zone->old_addrs);
 164
 165         zone->enabled = true;
 166         zone->custom_chains = true;
 167         zone->log_limit.rate = 10;
 168
 169         return zone;
 170 }
 171
 172 void
 173 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
 174 {
 175         struct uci_section *s;
 176         struct uci_element *e;
 177         struct fw3_zone *zone;
 178         struct fw3_defaults *defs = &state->defaults;
 179
 180         INIT_LIST_HEAD(&state->zones);
 181
 182         uci_foreach_element(&p->sections, e)
 183         {
 184                 s = uci_to_section(e);
 185
 186                 if (strcmp(s->type, "zone"))
 187                         continue;
 188
 189                 zone = fw3_alloc_zone();
 190
 191                 if (!zone)
 192                         continue;
 193
 194                 if (!fw3_parse_options(zone, fw3_zone_opts, s))
 195                         warn_elem(e, "has invalid options");
 196
 197                 if (!zone->enabled)
 198                 {
 199                         fw3_free_zone(zone);
 200                         continue;
 201                 }
 202
 203                 if (!zone->extra_dest)
 204                         zone->extra_dest = zone->extra_src;
 205
 206                 if (!defs->custom_chains && zone->custom_chains)
 207                         zone->custom_chains = false;
 208
 209                 if (!zone->name || !*zone->name)
 210                 {
 211                         warn_elem(e, "has no name - ignoring");
 212                         fw3_free_zone(zone);
 213                         continue;
 214                 }
 215
 216                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
 217                 {
 218                         warn_elem(e, "must not have a name longer than %u characters",
 219                                      FW3_ZONE_MAXNAMELEN);
 220                         fw3_free_zone(zone);
 221                         continue;
 222                 }
 223
 224                 fw3_ubus_zone_devices(zone);
 225
 226                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 227                     list_empty(&zone->subnets) && !zone->extra_src)
 228                 {
 229                         warn_elem(e, "has no device, network, subnet or extra options");
 230                 }
 231
 232                 if (!check_masq_addrs(&zone->masq_src))
 233                 {
 234                         warn_elem(e, "has unresolved masq_src, disabling masq");
 235                         zone->masq = false;
 236                 }
 237
 238                 if (!check_masq_addrs(&zone->masq_dest))
 239                 {
 240                         warn_elem(e, "has unresolved masq_dest, disabling masq");
 241                         zone->masq = false;
 242                 }
 243
 244                 check_policy(e, &zone->policy_input, defs->policy_input, "input");
 245                 check_policy(e, &zone->policy_output, defs->policy_output, "output");
 246                 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
 247
 248                 resolve_networks(e, zone);
 249
 250                 if (zone->masq)
 251                 {
 252                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 253                 }
 254
 255                 if (zone->custom_chains)
 256                 {
 257                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 258                         fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
 259                 }
 260
 261                 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 262                 fw3_setbit(zone->flags[0], zone->policy_forward);
 263                 fw3_setbit(zone->flags[0], zone->policy_output);
 264
 265                 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 266                 fw3_setbit(zone->flags[1], zone->policy_forward);
 267                 fw3_setbit(zone->flags[1], zone->policy_output);
 268
 269                 list_add_tail(&zone->list, &state->zones);
 270         }
 271 }
 272
 273
 274 static void
 275 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 276                  bool reload, struct fw3_zone *zone)
 277 {
 278         int i;
 279         struct fw3_ipt_rule *r;
 280         const struct fw3_chain_spec *c;
 281
 282         const char *flt_chains[] = {
 283                 "input",   "input",
 284                 "output",  "output",
 285                 "forward", "forwarding",
 286         };
 287
 288         const char *nat_chains[] = {
 289                 "prerouting",  "prerouting",
 290                 "postrouting", "postrouting",
 291         };
 292
 293         if (!fw3_is_family(zone, handle->family))
 294                 return;
 295
 296         info("   * Zone '%s'", zone->name);
 297
 298         set(zone->flags, handle->family, handle->table);
 299
 300         if (zone->custom_chains)
 301                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 302
 303         for (c = zone_chains; c->format; c++)
 304         {
 305                 /* don't touch user chains on selective stop */
 306                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 307                         continue;
 308
 309                 if (!fw3_is_family(c, handle->family))
 310                         continue;
 311
 312                 if (c->table != handle->table)
 313                         continue;
 314
 315                 if (c->flag &&
 316                     !fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 317                         continue;
 318
 319                 fw3_ipt_create_chain(handle, c->format, zone->name);
 320         }
 321
 322         if (zone->custom_chains)
 323         {
 324                 if (handle->table == FW3_TABLE_FILTER)
 325                 {
 326                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 327                         {
 328                                 r = fw3_ipt_rule_new(handle);
 329                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 330                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 331                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 332                         }
 333                 }
 334                 else if (handle->table == FW3_TABLE_NAT)
 335                 {
 336                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 337                         {
 338                                 r = fw3_ipt_rule_new(handle);
 339                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 340                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 341                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 342                         }
 343                 }
 344         }
 345
 346         set(zone->flags, handle->family, handle->table);
 347 }
 348
 349 static void
 350 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 351                                          bool reload, struct fw3_zone *zone,
 352                      struct fw3_device *dev, struct fw3_address *sub)
 353 {
 354         struct fw3_protocol tcp = { .protocol = 6 };
 355         struct fw3_ipt_rule *r;
 356         enum fw3_flag t;
 357
 358         char buf[32];
 359
 360         int i;
 361
 362         const char *chains[] = {
 363                 "input", "INPUT",
 364                 "output", "OUTPUT",
 365                 "forward", "FORWARD",
 366         };
 367
 368 #define jump_target(t) \
 369         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 370
 371         if (handle->table == FW3_TABLE_FILTER)
 372         {
 373                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 374                 {
 375                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 376                         {
 377                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 378                                 fw3_ipt_rule_target(r, jump_target(t));
 379                                 fw3_ipt_rule_extra(r, zone->extra_src);
 380
 381                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 382                                         fw3_ipt_rule_extra(r,
 383                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 384
 385                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 386                                                      fw3_flag_names[t]);
 387                         }
 388
 389                         if (has(zone->flags, handle->family, t))
 390                         {
 391                                 if (t == FW3_FLAG_ACCEPT &&
 392                                     zone->masq && !zone->masq_allow_invalid)
 393                                 {
 394                                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 395                                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID");
 396                                         fw3_ipt_rule_comment(r, "Prevent NAT leakage");
 397                                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_DROP]);
 398                                         fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 399                                                              fw3_flag_names[t]);
 400                                 }
 401
 402                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 403                                 fw3_ipt_rule_target(r, jump_target(t));
 404                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 405                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 406                                                      fw3_flag_names[t]);
 407                         }
 408                 }
 409
 410                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 411                 {
 412                         if (*chains[i] == 'o')
 413                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 414                         else
 415                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 416
 417                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 418
 419                         if (*chains[i] == 'o')
 420                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 421                         else
 422                                 fw3_ipt_rule_extra(r, zone->extra_src);
 423
 424                         fw3_ipt_rule_replace(r, chains[i + 1]);
 425                 }
 426         }
 427         else if (handle->table == FW3_TABLE_NAT)
 428         {
 429                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 430                 {
 431                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 432                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 433                         fw3_ipt_rule_extra(r, zone->extra_src);
 434                         fw3_ipt_rule_replace(r, "PREROUTING");
 435                 }
 436
 437                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 438                 {
 439                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 440                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 441                         fw3_ipt_rule_extra(r, zone->extra_dest);
 442                         fw3_ipt_rule_replace(r, "POSTROUTING");
 443                 }
 444         }
 445         else if (handle->table == FW3_TABLE_MANGLE)
 446         {
 447                 if (zone->mtu_fix)
 448                 {
 449                         if (zone->log)
 450                         {
 451                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 452
 453                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 454                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 455                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 456                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 457                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 458                                 fw3_ipt_rule_target(r, "LOG");
 459                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 460                                 fw3_ipt_rule_replace(r, "FORWARD");
 461                         }
 462
 463                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 464                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 465                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 466                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 467                         fw3_ipt_rule_target(r, "TCPMSS");
 468                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 469                         fw3_ipt_rule_replace(r, "FORWARD");
 470                 }
 471         }
 472         else if (handle->table == FW3_TABLE_RAW)
 473         {
 474                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 475                 {
 476                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 477                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 478                         fw3_ipt_rule_extra(r, zone->extra_src);
 479                         fw3_ipt_rule_replace(r, "PREROUTING");
 480                 }
 481         }
 482 }
 483
 484 static void
 485 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 486                       bool reload, struct fw3_zone *zone)
 487 {
 488         struct fw3_device *dev;
 489         struct fw3_address *sub;
 490
 491         fw3_foreach(dev, &zone->devices)
 492         fw3_foreach(sub, &zone->subnets)
 493         {
 494                 if (!fw3_is_family(sub, handle->family))
 495                         continue;
 496
 497                 if (!dev && !sub)
 498                         continue;
 499
 500                 print_interface_rule(handle, state, reload, zone, dev, sub);
 501         }
 502 }
 503
 504 static struct fw3_address *
 505 next_addr(struct fw3_address *addr, struct list_head *list,
 506                 enum fw3_family family, bool invert)
 507 {
 508         struct list_head *p;
 509         struct fw3_address *rv;
 510
 511         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 512         {
 513                 rv = list_entry(p, struct fw3_address, list);
 514
 515                 if (fw3_is_family(rv, family) && rv->set && rv->invert == invert)
 516                         return rv;
 517         }
 518
 519         return NULL;
 520 }
 521
 522 static void
 523 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 524                 bool reload, struct fw3_zone *zone)
 525 {
 526         bool first_src, first_dest;
 527         struct fw3_address *msrc;
 528         struct fw3_address *mdest;
 529         struct fw3_ipt_rule *r;
 530
 531         enum fw3_flag t;
 532         char buf[32];
 533
 534         if (!fw3_is_family(zone, handle->family))
 535                 return;
 536
 537         switch (handle->table)
 538         {
 539         case FW3_TABLE_FILTER:
 540                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 541                 {
 542                         r = fw3_ipt_rule_new(handle);
 543                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 544                         fw3_ipt_rule_comment(r, "Accept port redirections");
 545                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 546                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 547
 548                         r = fw3_ipt_rule_new(handle);
 549                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 550                         fw3_ipt_rule_comment(r, "Accept port forwards");
 551                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 552                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 553                 }
 554
 555                 r = fw3_ipt_rule_new(handle);
 556                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 557                                      fw3_flag_names[zone->policy_input]);
 558                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 559
 560                 r = fw3_ipt_rule_new(handle);
 561                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 562                                      fw3_flag_names[zone->policy_forward]);
 563                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 564
 565                 r = fw3_ipt_rule_new(handle);
 566                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 567                                      fw3_flag_names[zone->policy_output]);
 568                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 569
 570                 if (zone->log)
 571                 {
 572                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 573                         {
 574                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 575                                 {
 576                                         r = fw3_ipt_rule_new(handle);
 577
 578                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 579                                                  fw3_flag_names[t], zone->name);
 580
 581                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 582                                         fw3_ipt_rule_target(r, "LOG");
 583                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 584                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 585                                                             zone->name, fw3_flag_names[t]);
 586                                 }
 587
 588                                 if (has(zone->flags, handle->family, t))
 589                                 {
 590                                         r = fw3_ipt_rule_new(handle);
 591
 592                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 593                                                  fw3_flag_names[t], zone->name);
 594
 595                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 596                                         fw3_ipt_rule_target(r, "LOG");
 597                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 598                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 599                                                             zone->name, fw3_flag_names[t]);
 600                                 }
 601                         }
 602                 }
 603                 break;
 604
 605         case FW3_TABLE_NAT:
 606                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 607                 {
 608                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 609                         for (msrc = NULL;
 610                              (msrc = next_addr(msrc, &zone->masq_src,
 611                                                handle->family, true)) != NULL; )
 612                         {
 613                                 msrc->invert = false;
 614                                 r = fw3_ipt_rule_new(handle);
 615                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 616                                 fw3_ipt_rule_target(r, "RETURN");
 617                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 618                                 msrc->invert = true;
 619                         }
 620
 621                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 622                         for (mdest = NULL;
 623                              (mdest = next_addr(mdest, &zone->masq_dest,
 624                                                 handle->family, true)) != NULL; )
 625                         {
 626                                 mdest->invert = false;
 627                                 r = fw3_ipt_rule_new(handle);
 628                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 629                                 fw3_ipt_rule_target(r, "RETURN");
 630                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 631                                 mdest->invert = true;
 632                         }
 633
 634                         /* emit masquerading entries for non-negated addresses
 635                            and ensure that both src and dest loops run at least once,
 636                            even if there are no relevant addresses */
 637                         for (first_src = true, msrc = NULL;
 638                              (msrc = next_addr(msrc, &zone->masq_src,
 639                                                    handle->family, false)) || first_src;
 640                              first_src = false)
 641                         {
 642                                 for (first_dest = true, mdest = NULL;
 643                                      (mdest = next_addr(mdest, &zone->masq_dest,
 644                                                             handle->family, false)) || first_dest;
 645                                      first_dest = false)
 646                                 {
 647                                         r = fw3_ipt_rule_new(handle);
 648                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 649                                         fw3_ipt_rule_target(r, "MASQUERADE");
 650                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 651                                 }
 652                         }
 653                 }
 654                 break;
 655
 656         case FW3_TABLE_RAW:
 657         case FW3_TABLE_MANGLE:
 658                 break;
 659         }
 660
 661         print_interface_rules(handle, state, reload, zone);
 662 }
 663
 664 void
 665 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 666                       bool reload)
 667 {
 668         struct fw3_zone *zone;
 669
 670         list_for_each_entry(zone, &state->zones, list)
 671                 print_zone_chain(handle, state, reload, zone);
 672 }
 673
 674 void
 675 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 676                      bool reload)
 677 {
 678         struct fw3_zone *zone;
 679
 680         list_for_each_entry(zone, &state->zones, list)
 681                 print_zone_rule(handle, state, reload, zone);
 682 }
 683
 684 void
 685 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 686                 bool reload)
 687 {
 688         struct fw3_zone *z, *tmp;
 689         const struct fw3_chain_spec *c;
 690         char chain[32];
 691
 692         list_for_each_entry_safe(z, tmp, &state->zones, list)
 693         {
 694                 if (!has(z->flags, handle->family, handle->table))
 695                         continue;
 696
 697                 for (c = zone_chains; c->format; c++)
 698                 {
 699                         /* don't touch user chains on selective stop */
 700                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 701                                 continue;
 702
 703                         if (!fw3_is_family(c, handle->family))
 704                                 continue;
 705
 706                         if (c->table != handle->table)
 707                                 continue;
 708
 709                         if (c->flag && !has(z->flags, handle->family, c->flag))
 710                                 continue;
 711
 712                         snprintf(chain, sizeof(chain), c->format, z->name);
 713                         fw3_ipt_flush_chain(handle, chain);
 714
 715                         /* keep certain basic chains that do not depend on any settings to
 716                            avoid purging unrelated user rules pointing to them */
 717                         if (reload && !c->flag)
 718                                 continue;
 719
 720                         fw3_ipt_delete_chain(handle, chain);
 721                 }
 722
 723                 del(z->flags, handle->family, handle->table);
 724         }
 725 }
 726
 727 void
 728 fw3_hotplug_zones(struct fw3_state *state, bool add)
 729 {
 730         struct fw3_zone *z;
 731         struct fw3_device *d;
 732
 733         list_for_each_entry(z, &state->zones, list)
 734         {
 735                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 736                 {
 737                         list_for_each_entry(d, &z->devices, list)
 738                                 fw3_hotplug(add, z, d);
 739
 740                         if (add)
 741                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 742                         else
 743                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 744                 }
 745         }
 746 }
 747
 748 struct fw3_zone *
 749 fw3_lookup_zone(struct fw3_state *state, const char *name)
 750 {
 751         struct fw3_zone *z;
 752
 753         if (list_empty(&state->zones))
 754                 return NULL;
 755
 756         list_for_each_entry(z, &state->zones, list)
 757         {
 758                 if (strcmp(z->name, name))
 759                         continue;
 760
 761                 return z;
 762         }
 763
 764         return NULL;
 765 }
 766
 767 struct list_head *
 768 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 769 {
 770         struct fw3_device *net;
 771         struct fw3_address *cur, *tmp;
 772         struct list_head *all;
 773
 774         all = calloc(1, sizeof(*all));
 775         if (!all)
 776                 return NULL;
 777
 778         INIT_LIST_HEAD(all);
 779
 780         if (addr && addr->set)
 781         {
 782                 tmp = malloc(sizeof(*tmp));
 783
 784                 if (tmp)
 785                 {
 786                         *tmp = *addr;
 787                         list_add_tail(&tmp->list, all);
 788                 }
 789         }
 790         else
 791         {
 792                 list_for_each_entry(net, &zone->networks, list)
 793                         fw3_ubus_address(all, net->name);
 794
 795                 list_for_each_entry(cur, &zone->subnets, list)
 796                 {
 797                         tmp = malloc(sizeof(*tmp));
 798
 799                         if (!tmp)
 800                                 continue;
 801
 802                         *tmp = *cur;
 803                         list_add_tail(&tmp->list, all);
 804                 }
 805         }
 806
 807         return all;
 808 }