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 #include "helpers.h"
  22
  23
  24 #define C(f, tbl, tgt, fmt) \
  25         { FW3_FAMILY_##f, FW3_TABLE_##tbl, FW3_FLAG_##tgt, fmt }
  26
  27 static const struct fw3_chain_spec zone_chains[] = {
  28         C(ANY, FILTER, UNSPEC,        "zone_%s_input"),
  29         C(ANY, FILTER, UNSPEC,        "zone_%s_output"),
  30         C(ANY, FILTER, UNSPEC,        "zone_%s_forward"),
  31
  32         C(ANY, FILTER, SRC_ACCEPT,    "zone_%s_src_ACCEPT"),
  33         C(ANY, FILTER, SRC_REJECT,    "zone_%s_src_REJECT"),
  34         C(ANY, FILTER, SRC_DROP,      "zone_%s_src_DROP"),
  35
  36         C(ANY, FILTER, ACCEPT,        "zone_%s_dest_ACCEPT"),
  37         C(ANY, FILTER, REJECT,        "zone_%s_dest_REJECT"),
  38         C(ANY, FILTER, DROP,          "zone_%s_dest_DROP"),
  39
  40         C(V4,  NAT,    SNAT,          "zone_%s_postrouting"),
  41         C(V4,  NAT,    DNAT,          "zone_%s_prerouting"),
  42
  43         C(ANY, RAW,    HELPER,        "zone_%s_helper"),
  44         C(ANY, RAW,    NOTRACK,       "zone_%s_notrack"),
  45
  46         C(ANY, FILTER, CUSTOM_CHAINS, "input_%s_rule"),
  47         C(ANY, FILTER, CUSTOM_CHAINS, "output_%s_rule"),
  48         C(ANY, FILTER, CUSTOM_CHAINS, "forwarding_%s_rule"),
  49
  50         C(V4,  NAT,    CUSTOM_CHAINS, "prerouting_%s_rule"),
  51         C(V4,  NAT,    CUSTOM_CHAINS, "postrouting_%s_rule"),
  52
  53         { }
  54 };
  55
  56 const struct fw3_option fw3_zone_opts[] = {
  57         FW3_OPT("enabled",             bool,     zone,     enabled),
  58
  59         FW3_OPT("name",                string,   zone,     name),
  60         FW3_OPT("family",              family,   zone,     family),
  61
  62         FW3_LIST("network",            device,   zone,     networks),
  63         FW3_LIST("device",             device,   zone,     devices),
  64         FW3_LIST("subnet",             network,  zone,     subnets),
  65
  66         FW3_OPT("input",               target,   zone,     policy_input),
  67         FW3_OPT("forward",             target,   zone,     policy_forward),
  68         FW3_OPT("output",              target,   zone,     policy_output),
  69
  70         FW3_OPT("masq",                bool,     zone,     masq),
  71         FW3_OPT("masq_allow_invalid",  bool,     zone,     masq_allow_invalid),
  72         FW3_LIST("masq_src",           network,  zone,     masq_src),
  73         FW3_LIST("masq_dest",          network,  zone,     masq_dest),
  74
  75         FW3_OPT("extra",               string,   zone,     extra_src),
  76         FW3_OPT("extra_src",           string,   zone,     extra_src),
  77         FW3_OPT("extra_dest",          string,   zone,     extra_dest),
  78
  79         FW3_OPT("mtu_fix",             bool,     zone,     mtu_fix),
  80         FW3_OPT("custom_chains",       bool,     zone,     custom_chains),
  81
  82         FW3_OPT("log",                 bool,     zone,     log),
  83         FW3_OPT("log_limit",           limit,    zone,     log_limit),
  84
  85         FW3_OPT("auto_helper",         bool,     zone,     auto_helper),
  86         FW3_LIST("helper",             cthelper, zone,     cthelpers),
  87
  88         FW3_OPT("__flags_v4",          int,      zone,     flags[0]),
  89         FW3_OPT("__flags_v6",          int,      zone,     flags[1]),
  90
  91         FW3_LIST("__addrs",            address,  zone,     old_addrs),
  92
  93         { }
  94 };
  95
  96
  97 static void
  98 check_policy(struct uci_element *e, enum fw3_flag *pol, enum fw3_flag def,
  99              const char *name)
 100 {
 101         if (*pol == FW3_FLAG_UNSPEC)
 102         {
 103                 warn_elem(e, "has no %s policy specified, using default", name);
 104                 *pol = def;
 105         }
 106         else if (*pol > FW3_FLAG_DROP)
 107         {
 108                 warn_elem(e, "has invalid %s policy, using default", name);
 109                 *pol = def;
 110         }
 111 }
 112
 113 static bool
 114 check_masq_addrs(struct list_head *head)
 115 {
 116         struct fw3_address *addr;
 117         int n_addr = 0, n_failed = 0;
 118
 119         list_for_each_entry(addr, head, list)
 120         {
 121                 if (addr->invert)
 122                         continue;
 123
 124                 n_addr++;
 125
 126                 if (!addr->set && addr->resolved)
 127                         n_failed++;
 128         }
 129
 130         return (n_addr == 0 || n_failed < n_addr);
 131 }
 132
 133 static void
 134 resolve_networks(struct uci_element *e, struct fw3_zone *zone)
 135 {
 136         struct fw3_device *net, *tmp;
 137
 138         list_for_each_entry(net, &zone->networks, list)
 139         {
 140                 tmp = fw3_ubus_device(net->name);
 141
 142                 if (!tmp)
 143                 {
 144                         warn_elem(e, "cannot resolve device of network '%s'", net->name);
 145                         continue;
 146                 }
 147
 148                 snprintf(tmp->network, sizeof(tmp->network), "%s", net->name);
 149                 list_add_tail(&tmp->list, &zone->devices);
 150         }
 151 }
 152
 153 static void
 154 resolve_cthelpers(struct fw3_state *s, struct uci_element *e, struct fw3_zone *zone)
 155 {
 156         struct fw3_cthelpermatch *match;
 157
 158         if (list_empty(&zone->cthelpers))
 159         {
 160                 if (!zone->masq && zone->auto_helper)
 161                 {
 162                         fw3_setbit(zone->flags[0], FW3_FLAG_HELPER);
 163                         fw3_setbit(zone->flags[1], FW3_FLAG_HELPER);
 164                 }
 165
 166                 return;
 167         }
 168
 169         list_for_each_entry(match, &zone->cthelpers, list)
 170         {
 171                 if (match->invert)
 172                 {
 173                         warn_elem(e, "must not use a negated helper match");
 174                         continue;
 175                 }
 176
 177                 match->ptr = fw3_lookup_cthelper(s, match->name);
 178
 179                 if (!match->ptr)
 180                 {
 181                         warn_elem(e, "refers to not existing helper '%s'", match->name);
 182                         continue;
 183                 }
 184
 185                 if (fw3_is_family(match->ptr, FW3_FAMILY_V4))
 186                         fw3_setbit(zone->flags[0], FW3_FLAG_HELPER);
 187
 188                 if (fw3_is_family(match->ptr, FW3_FAMILY_V6))
 189                         fw3_setbit(zone->flags[1], FW3_FLAG_HELPER);
 190         }
 191 }
 192
 193 struct fw3_zone *
 194 fw3_alloc_zone(void)
 195 {
 196         struct fw3_zone *zone;
 197
 198         zone = calloc(1, sizeof(*zone));
 199         if (!zone)
 200                 return NULL;
 201
 202         INIT_LIST_HEAD(&zone->networks);
 203         INIT_LIST_HEAD(&zone->devices);
 204         INIT_LIST_HEAD(&zone->subnets);
 205         INIT_LIST_HEAD(&zone->masq_src);
 206         INIT_LIST_HEAD(&zone->masq_dest);
 207         INIT_LIST_HEAD(&zone->cthelpers);
 208
 209         INIT_LIST_HEAD(&zone->old_addrs);
 210
 211         zone->enabled = true;
 212         zone->auto_helper = true;
 213         zone->custom_chains = true;
 214         zone->log_limit.rate = 10;
 215
 216         return zone;
 217 }
 218
 219 void
 220 fw3_load_zones(struct fw3_state *state, struct uci_package *p)
 221 {
 222         struct uci_section *s;
 223         struct uci_element *e;
 224         struct fw3_zone *zone;
 225         struct fw3_defaults *defs = &state->defaults;
 226
 227         INIT_LIST_HEAD(&state->zones);
 228
 229         uci_foreach_element(&p->sections, e)
 230         {
 231                 s = uci_to_section(e);
 232
 233                 if (strcmp(s->type, "zone"))
 234                         continue;
 235
 236                 zone = fw3_alloc_zone();
 237
 238                 if (!zone)
 239                         continue;
 240
 241                 if (!fw3_parse_options(zone, fw3_zone_opts, s))
 242                         warn_elem(e, "has invalid options");
 243
 244                 if (!zone->enabled)
 245                 {
 246                         fw3_free_zone(zone);
 247                         continue;
 248                 }
 249
 250                 if (!zone->extra_dest)
 251                         zone->extra_dest = zone->extra_src;
 252
 253                 if (!defs->custom_chains && zone->custom_chains)
 254                         zone->custom_chains = false;
 255
 256                 if (!defs->auto_helper && zone->auto_helper)
 257                         zone->auto_helper = false;
 258
 259                 if (!zone->name || !*zone->name)
 260                 {
 261                         warn_elem(e, "has no name - ignoring");
 262                         fw3_free_zone(zone);
 263                         continue;
 264                 }
 265
 266                 if (strlen(zone->name) > FW3_ZONE_MAXNAMELEN)
 267                 {
 268                         warn_elem(e, "must not have a name longer than %u characters",
 269                                      FW3_ZONE_MAXNAMELEN);
 270                         fw3_free_zone(zone);
 271                         continue;
 272                 }
 273
 274                 fw3_ubus_zone_devices(zone);
 275
 276                 if (list_empty(&zone->networks) && list_empty(&zone->devices) &&
 277                     list_empty(&zone->subnets) && !zone->extra_src)
 278                 {
 279                         warn_elem(e, "has no device, network, subnet or extra options");
 280                 }
 281
 282                 if (!check_masq_addrs(&zone->masq_src))
 283                 {
 284                         warn_elem(e, "has unresolved masq_src, disabling masq");
 285                         zone->masq = false;
 286                 }
 287
 288                 if (!check_masq_addrs(&zone->masq_dest))
 289                 {
 290                         warn_elem(e, "has unresolved masq_dest, disabling masq");
 291                         zone->masq = false;
 292                 }
 293
 294                 check_policy(e, &zone->policy_input, defs->policy_input, "input");
 295                 check_policy(e, &zone->policy_output, defs->policy_output, "output");
 296                 check_policy(e, &zone->policy_forward, defs->policy_forward, "forward");
 297
 298                 resolve_networks(e, zone);
 299
 300                 if (zone->masq)
 301                 {
 302                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 303                 }
 304
 305                 if (zone->custom_chains)
 306                 {
 307                         fw3_setbit(zone->flags[0], FW3_FLAG_SNAT);
 308                         fw3_setbit(zone->flags[0], FW3_FLAG_DNAT);
 309                 }
 310
 311                 resolve_cthelpers(state, e, zone);
 312
 313                 fw3_setbit(zone->flags[0], fw3_to_src_target(zone->policy_input));
 314                 fw3_setbit(zone->flags[0], zone->policy_forward);
 315                 fw3_setbit(zone->flags[0], zone->policy_output);
 316
 317                 fw3_setbit(zone->flags[1], fw3_to_src_target(zone->policy_input));
 318                 fw3_setbit(zone->flags[1], zone->policy_forward);
 319                 fw3_setbit(zone->flags[1], zone->policy_output);
 320
 321                 list_add_tail(&zone->list, &state->zones);
 322         }
 323 }
 324
 325
 326 static void
 327 print_zone_chain(struct fw3_ipt_handle *handle, struct fw3_state *state,
 328                  bool reload, struct fw3_zone *zone)
 329 {
 330         int i;
 331         struct fw3_ipt_rule *r;
 332         const struct fw3_chain_spec *c;
 333
 334         const char *flt_chains[] = {
 335                 "input",   "input",
 336                 "output",  "output",
 337                 "forward", "forwarding",
 338         };
 339
 340         const char *nat_chains[] = {
 341                 "prerouting",  "prerouting",
 342                 "postrouting", "postrouting",
 343         };
 344
 345         if (!fw3_is_family(zone, handle->family))
 346                 return;
 347
 348         set(zone->flags, handle->family, handle->table);
 349
 350         if (zone->custom_chains)
 351                 set(zone->flags, handle->family, FW3_FLAG_CUSTOM_CHAINS);
 352
 353         for (c = zone_chains; c->format; c++)
 354         {
 355                 /* don't touch user chains on selective stop */
 356                 if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 357                         continue;
 358
 359                 if (!fw3_is_family(c, handle->family))
 360                         continue;
 361
 362                 if (c->table != handle->table)
 363                         continue;
 364
 365                 if (c->flag &&
 366                     !fw3_hasbit(zone->flags[handle->family == FW3_FAMILY_V6], c->flag))
 367                         continue;
 368
 369                 fw3_ipt_create_chain(handle, c->format, zone->name);
 370         }
 371
 372         if (zone->custom_chains)
 373         {
 374                 if (handle->table == FW3_TABLE_FILTER)
 375                 {
 376                         for (i = 0; i < sizeof(flt_chains)/sizeof(flt_chains[0]); i += 2)
 377                         {
 378                                 r = fw3_ipt_rule_new(handle);
 379                                 fw3_ipt_rule_comment(r, "user chain for %s", flt_chains[i+1]);
 380                                 fw3_ipt_rule_target(r, "%s_%s_rule", flt_chains[i+1], zone->name);
 381                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, flt_chains[i]);
 382                         }
 383                 }
 384                 else if (handle->table == FW3_TABLE_NAT)
 385                 {
 386                         for (i = 0; i < sizeof(nat_chains)/sizeof(nat_chains[0]); i += 2)
 387                         {
 388                                 r = fw3_ipt_rule_new(handle);
 389                                 fw3_ipt_rule_comment(r, "user chain for %s", nat_chains[i+1]);
 390                                 fw3_ipt_rule_target(r, "%s_%s_rule", nat_chains[i+1], zone->name);
 391                                 fw3_ipt_rule_append(r, "zone_%s_%s", zone->name, nat_chains[i]);
 392                         }
 393                 }
 394         }
 395
 396         set(zone->flags, handle->family, handle->table);
 397 }
 398
 399 static void
 400 print_interface_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 401                                          bool reload, struct fw3_zone *zone,
 402                      struct fw3_device *dev, struct fw3_address *sub)
 403 {
 404         struct fw3_protocol tcp = { .protocol = 6 };
 405         struct fw3_ipt_rule *r;
 406         enum fw3_flag t;
 407
 408         char buf[32];
 409
 410         int i;
 411
 412         const char *chains[] = {
 413                 "input", "INPUT",
 414                 "output", "OUTPUT",
 415                 "forward", "FORWARD",
 416         };
 417
 418 #define jump_target(t) \
 419         ((t == FW3_FLAG_REJECT) ? "reject" : fw3_flag_names[t])
 420
 421         if (handle->table == FW3_TABLE_FILTER)
 422         {
 423                 for (t = FW3_FLAG_ACCEPT; t <= FW3_FLAG_DROP; t++)
 424                 {
 425                         if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 426                         {
 427                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 428                                 fw3_ipt_rule_target(r, jump_target(t));
 429                                 fw3_ipt_rule_extra(r, zone->extra_src);
 430
 431                                 if (t == FW3_FLAG_ACCEPT && !state->defaults.drop_invalid)
 432                                         fw3_ipt_rule_extra(r,
 433                                                            "-m conntrack --ctstate NEW,UNTRACKED");
 434
 435                                 fw3_ipt_rule_replace(r, "zone_%s_src_%s", zone->name,
 436                                                      fw3_flag_names[t]);
 437                         }
 438
 439                         if (has(zone->flags, handle->family, t))
 440                         {
 441                                 if (t == FW3_FLAG_ACCEPT &&
 442                                     zone->masq && !zone->masq_allow_invalid)
 443                                 {
 444                                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 445                                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate INVALID");
 446                                         fw3_ipt_rule_comment(r, "Prevent NAT leakage");
 447                                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_DROP]);
 448                                         fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 449                                                              fw3_flag_names[t]);
 450                                 }
 451
 452                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 453                                 fw3_ipt_rule_target(r, jump_target(t));
 454                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 455                                 fw3_ipt_rule_replace(r, "zone_%s_dest_%s", zone->name,
 456                                                      fw3_flag_names[t]);
 457                         }
 458                 }
 459
 460                 for (i = 0; i < sizeof(chains)/sizeof(chains[0]); i += 2)
 461                 {
 462                         if (*chains[i] == 'o')
 463                                 r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 464                         else
 465                                 r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 466
 467                         fw3_ipt_rule_target(r, "zone_%s_%s", zone->name, chains[i]);
 468
 469                         if (*chains[i] == 'o')
 470                                 fw3_ipt_rule_extra(r, zone->extra_dest);
 471                         else
 472                                 fw3_ipt_rule_extra(r, zone->extra_src);
 473
 474                         fw3_ipt_rule_replace(r, chains[i + 1]);
 475                 }
 476         }
 477         else if (handle->table == FW3_TABLE_NAT)
 478         {
 479                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 480                 {
 481                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 482                         fw3_ipt_rule_target(r, "zone_%s_prerouting", zone->name);
 483                         fw3_ipt_rule_extra(r, zone->extra_src);
 484                         fw3_ipt_rule_replace(r, "PREROUTING");
 485                 }
 486
 487                 if (has(zone->flags, handle->family, FW3_FLAG_SNAT))
 488                 {
 489                         r = fw3_ipt_rule_create(handle, NULL, NULL, dev, NULL, sub);
 490                         fw3_ipt_rule_target(r, "zone_%s_postrouting", zone->name);
 491                         fw3_ipt_rule_extra(r, zone->extra_dest);
 492                         fw3_ipt_rule_replace(r, "POSTROUTING");
 493                 }
 494         }
 495         else if (handle->table == FW3_TABLE_MANGLE)
 496         {
 497                 if (zone->mtu_fix)
 498                 {
 499                         if (zone->log)
 500                         {
 501                                 snprintf(buf, sizeof(buf) - 1, "MSSFIX(%s): ", zone->name);
 502
 503                                 r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 504                                 fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 505                                 fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 506                                 fw3_ipt_rule_limit(r, &zone->log_limit);
 507                                 fw3_ipt_rule_comment(r, "%s (mtu_fix logging)", zone->name);
 508                                 fw3_ipt_rule_target(r, "LOG");
 509                                 fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 510                                 fw3_ipt_rule_replace(r, "FORWARD");
 511                         }
 512
 513                         r = fw3_ipt_rule_create(handle, &tcp, NULL, dev, NULL, sub);
 514                         fw3_ipt_rule_addarg(r, false, "--tcp-flags", "SYN,RST");
 515                         fw3_ipt_rule_addarg(r, false, "SYN", NULL);
 516                         fw3_ipt_rule_comment(r, "%s (mtu_fix)", zone->name);
 517                         fw3_ipt_rule_target(r, "TCPMSS");
 518                         fw3_ipt_rule_addarg(r, false, "--clamp-mss-to-pmtu", NULL);
 519                         fw3_ipt_rule_replace(r, "FORWARD");
 520                 }
 521         }
 522         else if (handle->table == FW3_TABLE_RAW)
 523         {
 524                 if (has(zone->flags, handle->family, FW3_FLAG_HELPER))
 525                 {
 526                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 527                         fw3_ipt_rule_comment(r, "%s CT helper assignment", zone->name);
 528                         fw3_ipt_rule_target(r, "zone_%s_helper", zone->name);
 529                         fw3_ipt_rule_extra(r, zone->extra_src);
 530                         fw3_ipt_rule_replace(r, "PREROUTING");
 531                 }
 532
 533                 if (has(zone->flags, handle->family, FW3_FLAG_NOTRACK))
 534                 {
 535                         r = fw3_ipt_rule_create(handle, NULL, dev, NULL, sub, NULL);
 536                         fw3_ipt_rule_comment(r, "%s CT bypass", zone->name);
 537                         fw3_ipt_rule_target(r, "zone_%s_notrack", zone->name);
 538                         fw3_ipt_rule_extra(r, zone->extra_src);
 539                         fw3_ipt_rule_replace(r, "PREROUTING");
 540                 }
 541         }
 542 }
 543
 544 static void
 545 print_interface_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 546                       bool reload, struct fw3_zone *zone)
 547 {
 548         struct fw3_device *dev;
 549         struct fw3_address *sub;
 550
 551         fw3_foreach(dev, &zone->devices)
 552         fw3_foreach(sub, &zone->subnets)
 553         {
 554                 if (!fw3_is_family(sub, handle->family))
 555                         continue;
 556
 557                 if (!dev && !sub)
 558                         continue;
 559
 560                 print_interface_rule(handle, state, reload, zone, dev, sub);
 561         }
 562 }
 563
 564 static struct fw3_address *
 565 next_addr(struct fw3_address *addr, struct list_head *list,
 566                 enum fw3_family family, bool invert)
 567 {
 568         struct list_head *p;
 569         struct fw3_address *rv;
 570
 571         for (p = addr ? addr->list.next : list->next; p != list; p = p->next)
 572         {
 573                 rv = list_entry(p, struct fw3_address, list);
 574
 575                 if (fw3_is_family(rv, family) && rv->set && rv->invert == invert)
 576                         return rv;
 577         }
 578
 579         return NULL;
 580 }
 581
 582 static void
 583 print_zone_rule(struct fw3_ipt_handle *handle, struct fw3_state *state,
 584                 bool reload, struct fw3_zone *zone)
 585 {
 586         bool first_src, first_dest;
 587         struct fw3_address *msrc;
 588         struct fw3_address *mdest;
 589         struct fw3_ipt_rule *r;
 590
 591         enum fw3_flag t;
 592         char buf[32];
 593
 594         if (!fw3_is_family(zone, handle->family))
 595                 return;
 596
 597         info("   * Zone '%s'", zone->name);
 598
 599         switch (handle->table)
 600         {
 601         case FW3_TABLE_FILTER:
 602                 if (has(zone->flags, handle->family, FW3_FLAG_DNAT))
 603                 {
 604                         r = fw3_ipt_rule_new(handle);
 605                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 606                         fw3_ipt_rule_comment(r, "Accept port redirections");
 607                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 608                         fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 609
 610                         r = fw3_ipt_rule_new(handle);
 611                         fw3_ipt_rule_extra(r, "-m conntrack --ctstate DNAT");
 612                         fw3_ipt_rule_comment(r, "Accept port forwards");
 613                         fw3_ipt_rule_target(r, fw3_flag_names[FW3_FLAG_ACCEPT]);
 614                         fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 615                 }
 616
 617                 r = fw3_ipt_rule_new(handle);
 618                 fw3_ipt_rule_target(r, "zone_%s_src_%s", zone->name,
 619                                      fw3_flag_names[zone->policy_input]);
 620                 fw3_ipt_rule_append(r, "zone_%s_input", zone->name);
 621
 622                 r = fw3_ipt_rule_new(handle);
 623                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 624                                      fw3_flag_names[zone->policy_forward]);
 625                 fw3_ipt_rule_append(r, "zone_%s_forward", zone->name);
 626
 627                 r = fw3_ipt_rule_new(handle);
 628                 fw3_ipt_rule_target(r, "zone_%s_dest_%s", zone->name,
 629                                      fw3_flag_names[zone->policy_output]);
 630                 fw3_ipt_rule_append(r, "zone_%s_output", zone->name);
 631
 632                 if (zone->log)
 633                 {
 634                         for (t = FW3_FLAG_REJECT; t <= FW3_FLAG_DROP; t++)
 635                         {
 636                                 if (has(zone->flags, handle->family, fw3_to_src_target(t)))
 637                                 {
 638                                         r = fw3_ipt_rule_new(handle);
 639
 640                                         snprintf(buf, sizeof(buf) - 1, "%s(src %s)",
 641                                                  fw3_flag_names[t], zone->name);
 642
 643                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 644                                         fw3_ipt_rule_target(r, "LOG");
 645                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 646                                         fw3_ipt_rule_append(r, "zone_%s_src_%s",
 647                                                             zone->name, fw3_flag_names[t]);
 648                                 }
 649
 650                                 if (has(zone->flags, handle->family, t))
 651                                 {
 652                                         r = fw3_ipt_rule_new(handle);
 653
 654                                         snprintf(buf, sizeof(buf) - 1, "%s(dest %s)",
 655                                                  fw3_flag_names[t], zone->name);
 656
 657                                         fw3_ipt_rule_limit(r, &zone->log_limit);
 658                                         fw3_ipt_rule_target(r, "LOG");
 659                                         fw3_ipt_rule_addarg(r, false, "--log-prefix", buf);
 660                                         fw3_ipt_rule_append(r, "zone_%s_dest_%s",
 661                                                             zone->name, fw3_flag_names[t]);
 662                                 }
 663                         }
 664                 }
 665                 break;
 666
 667         case FW3_TABLE_NAT:
 668                 if (zone->masq && handle->family == FW3_FAMILY_V4)
 669                 {
 670                         /* for any negated masq_src ip, emit -s addr -j RETURN rules */
 671                         for (msrc = NULL;
 672                              (msrc = next_addr(msrc, &zone->masq_src,
 673                                                handle->family, true)) != NULL; )
 674                         {
 675                                 msrc->invert = false;
 676                                 r = fw3_ipt_rule_new(handle);
 677                                 fw3_ipt_rule_src_dest(r, msrc, NULL);
 678                                 fw3_ipt_rule_target(r, "RETURN");
 679                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 680                                 msrc->invert = true;
 681                         }
 682
 683                         /* for any negated masq_dest ip, emit -d addr -j RETURN rules */
 684                         for (mdest = NULL;
 685                              (mdest = next_addr(mdest, &zone->masq_dest,
 686                                                 handle->family, true)) != NULL; )
 687                         {
 688                                 mdest->invert = false;
 689                                 r = fw3_ipt_rule_new(handle);
 690                                 fw3_ipt_rule_src_dest(r, NULL, mdest);
 691                                 fw3_ipt_rule_target(r, "RETURN");
 692                                 fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 693                                 mdest->invert = true;
 694                         }
 695
 696                         /* emit masquerading entries for non-negated addresses
 697                            and ensure that both src and dest loops run at least once,
 698                            even if there are no relevant addresses */
 699                         for (first_src = true, msrc = NULL;
 700                              (msrc = next_addr(msrc, &zone->masq_src,
 701                                                    handle->family, false)) || first_src;
 702                              first_src = false)
 703                         {
 704                                 for (first_dest = true, mdest = NULL;
 705                                      (mdest = next_addr(mdest, &zone->masq_dest,
 706                                                             handle->family, false)) || first_dest;
 707                                      first_dest = false)
 708                                 {
 709                                         r = fw3_ipt_rule_new(handle);
 710                                         fw3_ipt_rule_src_dest(r, msrc, mdest);
 711                                         fw3_ipt_rule_target(r, "MASQUERADE");
 712                                         fw3_ipt_rule_append(r, "zone_%s_postrouting", zone->name);
 713                                 }
 714                         }
 715                 }
 716                 break;
 717
 718         case FW3_TABLE_RAW:
 719                 fw3_print_cthelpers(handle, state, zone);
 720                 break;
 721
 722         case FW3_TABLE_MANGLE:
 723                 break;
 724         }
 725
 726         print_interface_rules(handle, state, reload, zone);
 727 }
 728
 729 void
 730 fw3_print_zone_chains(struct fw3_ipt_handle *handle, struct fw3_state *state,
 731                       bool reload)
 732 {
 733         struct fw3_zone *zone;
 734
 735         list_for_each_entry(zone, &state->zones, list)
 736                 print_zone_chain(handle, state, reload, zone);
 737 }
 738
 739 void
 740 fw3_print_zone_rules(struct fw3_ipt_handle *handle, struct fw3_state *state,
 741                      bool reload)
 742 {
 743         struct fw3_zone *zone;
 744
 745         list_for_each_entry(zone, &state->zones, list)
 746                 print_zone_rule(handle, state, reload, zone);
 747 }
 748
 749 void
 750 fw3_flush_zones(struct fw3_ipt_handle *handle, struct fw3_state *state,
 751                 bool reload)
 752 {
 753         struct fw3_zone *z, *tmp;
 754         const struct fw3_chain_spec *c;
 755         char chain[32];
 756
 757         list_for_each_entry_safe(z, tmp, &state->zones, list)
 758         {
 759                 if (!has(z->flags, handle->family, handle->table))
 760                         continue;
 761
 762                 for (c = zone_chains; c->format; c++)
 763                 {
 764                         /* don't touch user chains on selective stop */
 765                         if (reload && c->flag == FW3_FLAG_CUSTOM_CHAINS)
 766                                 continue;
 767
 768                         if (!fw3_is_family(c, handle->family))
 769                                 continue;
 770
 771                         if (c->table != handle->table)
 772                                 continue;
 773
 774                         if (c->flag && !has(z->flags, handle->family, c->flag))
 775                                 continue;
 776
 777                         snprintf(chain, sizeof(chain), c->format, z->name);
 778                         fw3_ipt_flush_chain(handle, chain);
 779
 780                         /* keep certain basic chains that do not depend on any settings to
 781                            avoid purging unrelated user rules pointing to them */
 782                         if (reload && !c->flag)
 783                                 continue;
 784
 785                         fw3_ipt_delete_chain(handle, chain);
 786                 }
 787
 788                 del(z->flags, handle->family, handle->table);
 789         }
 790 }
 791
 792 void
 793 fw3_hotplug_zones(struct fw3_state *state, bool add)
 794 {
 795         struct fw3_zone *z;
 796         struct fw3_device *d;
 797
 798         list_for_each_entry(z, &state->zones, list)
 799         {
 800                 if (add != fw3_hasbit(z->flags[0], FW3_FLAG_HOTPLUG))
 801                 {
 802                         list_for_each_entry(d, &z->devices, list)
 803                                 fw3_hotplug(add, z, d);
 804
 805                         if (add)
 806                                 fw3_setbit(z->flags[0], FW3_FLAG_HOTPLUG);
 807                         else
 808                                 fw3_delbit(z->flags[0], FW3_FLAG_HOTPLUG);
 809                 }
 810         }
 811 }
 812
 813 struct fw3_zone *
 814 fw3_lookup_zone(struct fw3_state *state, const char *name)
 815 {
 816         struct fw3_zone *z;
 817
 818         if (list_empty(&state->zones))
 819                 return NULL;
 820
 821         list_for_each_entry(z, &state->zones, list)
 822         {
 823                 if (strcmp(z->name, name))
 824                         continue;
 825
 826                 return z;
 827         }
 828
 829         return NULL;
 830 }
 831
 832 struct list_head *
 833 fw3_resolve_zone_addresses(struct fw3_zone *zone, struct fw3_address *addr)
 834 {
 835         struct fw3_device *net;
 836         struct fw3_address *cur, *tmp;
 837         struct list_head *all;
 838
 839         all = calloc(1, sizeof(*all));
 840         if (!all)
 841                 return NULL;
 842
 843         INIT_LIST_HEAD(all);
 844
 845         if (addr && addr->set)
 846         {
 847                 tmp = malloc(sizeof(*tmp));
 848
 849                 if (tmp)
 850                 {
 851                         *tmp = *addr;
 852                         list_add_tail(&tmp->list, all);
 853                 }
 854         }
 855         else
 856         {
 857                 list_for_each_entry(net, &zone->networks, list)
 858                         fw3_ubus_address(all, net->name);
 859
 860                 list_for_each_entry(cur, &zone->subnets, list)
 861                 {
 862                         tmp = malloc(sizeof(*tmp));
 863
 864                         if (!tmp)
 865                                 continue;
 866
 867                         *tmp = *cur;
 868                         list_add_tail(&tmp->list, all);
 869                 }
 870         }
 871
 872         return all;
 873 }