redirects.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013-2018 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 "redirects.h"
  20
  21
  22 const struct fw3_option fw3_redirect_opts[] = {
  23         FW3_OPT("enabled",             bool,      redirect,     enabled),
  24
  25         FW3_OPT("name",                string,    redirect,     name),
  26         FW3_OPT("family",              family,    redirect,     family),
  27
  28         FW3_OPT("src",                 device,    redirect,     src),
  29         FW3_OPT("dest",                device,    redirect,     dest),
  30
  31         FW3_OPT("ipset",               setmatch,  redirect,     ipset),
  32         FW3_OPT("helper",              cthelper,  redirect,     helper),
  33
  34         FW3_LIST("proto",              protocol,  redirect,     proto),
  35
  36         FW3_OPT("src_ip",              network,   redirect,     ip_src),
  37         FW3_LIST("src_mac",            mac,       redirect,     mac_src),
  38         FW3_OPT("src_port",            port,      redirect,     port_src),
  39
  40         FW3_OPT("src_dip",             network,   redirect,     ip_dest),
  41         FW3_OPT("src_dport",           port,      redirect,     port_dest),
  42
  43         FW3_OPT("dest_ip",             network,   redirect,     ip_redir),
  44         FW3_OPT("dest_port",           port,      redirect,     port_redir),
  45
  46         FW3_OPT("extra",               string,    redirect,     extra),
  47
  48         FW3_OPT("limit",               limit,     redirect,     limit),
  49         FW3_OPT("limit_burst",         int,       redirect,     limit.burst),
  50
  51         FW3_OPT("utc_time",            bool,      redirect,     time.utc),
  52         FW3_OPT("start_date",          date,      redirect,     time.datestart),
  53         FW3_OPT("stop_date",           date,      redirect,     time.datestop),
  54         FW3_OPT("start_time",          time,      redirect,     time.timestart),
  55         FW3_OPT("stop_time",           time,      redirect,     time.timestop),
  56         FW3_OPT("weekdays",            weekdays,  redirect,     time.weekdays),
  57         FW3_OPT("monthdays",           monthdays, redirect,     time.monthdays),
  58
  59         FW3_OPT("mark",                mark,      redirect,     mark),
  60
  61         FW3_OPT("reflection",          bool,      redirect,     reflection),
  62         FW3_OPT("reflection_src",      reflection_source,
  63                                                   redirect,     reflection_src),
  64         FW3_LIST("reflection_zone",    device,    redirect,     reflection_zones),
  65
  66         FW3_OPT("target",              target,    redirect,     target),
  67
  68         { }
  69 };
  70
  71
  72 static bool
  73 check_families(struct uci_element *e, struct fw3_redirect *r)
  74 {
  75         if (r->family == FW3_FAMILY_ANY)
  76                 return true;
  77
  78         if (r->_src && r->_src->family && r->_src->family != r->family)
  79         {
  80                 warn_elem(e, "refers to source zone with different family");
  81                 return false;
  82         }
  83
  84         if (r->_dest && r->_dest->family && r->_dest->family != r->family)
  85         {
  86                 warn_elem(e, "refers to destination zone with different family");
  87                 return false;
  88         }
  89
  90         if (r->ipset.ptr && r->ipset.ptr->family &&
  91             r->ipset.ptr->family != r->family)
  92         {
  93                 warn_elem(e, "refers to ipset with different family");
  94                 return false;
  95         }
  96
  97         if (r->helper.ptr && r->helper.ptr->family &&
  98             r->helper.ptr->family != r->family)
  99         {
 100                 warn_elem(e, "refers to CT helper not supporting family");
 101                 return false;
 102         }
 103
 104         if (r->ip_src.family && r->ip_src.family != r->family)
 105         {
 106                 warn_elem(e, "uses source ip with different family");
 107                 return false;
 108         }
 109
 110         if (r->ip_dest.family && r->ip_dest.family != r->family)
 111         {
 112                 warn_elem(e, "uses destination ip with different family");
 113                 return false;
 114         }
 115
 116         if (r->ip_redir.family && r->ip_redir.family != r->family)
 117         {
 118                 warn_elem(e, "uses redirect ip with different family");
 119                 return false;
 120         }
 121
 122         return true;
 123 }
 124
 125 static bool
 126 compare_addr(struct fw3_address *a, struct fw3_address *b)
 127 {
 128         if (a->family != FW3_FAMILY_V4 || b->family != FW3_FAMILY_V4)
 129                 return false;
 130
 131         return ((a->address.v4.s_addr & a->mask.v4.s_addr) ==
 132                 (b->address.v4.s_addr & a->mask.v4.s_addr));
 133 }
 134
 135 static bool
 136 resolve_dest(struct uci_element *e, struct fw3_redirect *redir,
 137              struct fw3_state *state)
 138 {
 139         struct fw3_zone *zone;
 140         struct fw3_address *addr;
 141         struct list_head *addrs;
 142
 143         if (!redir->ip_redir.set)
 144                 return false;
 145
 146         list_for_each_entry(zone, &state->zones, list)
 147         {
 148                 addrs = fw3_resolve_zone_addresses(zone, NULL);
 149
 150                 if (!addrs)
 151                         continue;
 152
 153                 list_for_each_entry(addr, addrs, list)
 154                 {
 155                         if (!compare_addr(addr, &redir->ip_redir))
 156                                 continue;
 157
 158                         snprintf(redir->dest.name, sizeof(redir->dest.name), "%s", zone->name);
 159                         redir->dest.set = true;
 160                         redir->_dest = zone;
 161
 162                         break;
 163                 }
 164
 165                 fw3_free_list(addrs);
 166
 167                 if (redir->_dest)
 168                         return true;
 169         }
 170
 171         return false;
 172 }
 173
 174 static bool
 175 check_local(struct uci_element *e, struct fw3_redirect *redir,
 176             struct fw3_state *state)
 177 {
 178         if (redir->target != FW3_FLAG_DNAT)
 179                 return false;
 180
 181         if (!redir->ip_redir.set)
 182                 redir->local = true;
 183
 184         return redir->local;
 185 }
 186
 187 static void
 188 select_helper(struct fw3_state *state, struct fw3_redirect *redir)
 189 {
 190         struct fw3_protocol *proto;
 191         struct fw3_cthelper *helper;
 192         int n_matches = 0;
 193
 194         if (!state->defaults.auto_helper)
 195                 return;
 196
 197         if (!redir->_src || redir->target != FW3_FLAG_DNAT)
 198                 return;
 199
 200         if (!redir->port_redir.set || redir->port_redir.invert)
 201                 return;
 202
 203         if (redir->helper.set || redir->helper.ptr)
 204                 return;
 205
 206         if (list_empty(&redir->proto))
 207                 return;
 208
 209         list_for_each_entry(proto, &redir->proto, list)
 210         {
 211                 helper = fw3_lookup_cthelper_by_proto_port(state, proto, &redir->port_redir);
 212
 213                 if (helper)
 214                         n_matches++;
 215         }
 216
 217         if (n_matches != 1)
 218                 return;
 219
 220         /* store pointer to auto-selected helper but set ".set" flag to false,
 221          * to allow later code to decide between configured or auto-selected
 222          * helpers */
 223         redir->helper.set = false;
 224         redir->helper.ptr = helper;
 225
 226         set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
 227 }
 228
 229 static bool
 230 check_redirect(struct fw3_state *state, struct fw3_redirect *redir, struct uci_element *e)
 231 {
 232         bool valid;
 233
 234         if (!redir->enabled)
 235                 return false;
 236
 237         if (redir->src.invert)
 238         {
 239                 warn_section("redirect", redir, e, "must not have an inverted source");
 240                 return false;
 241         }
 242         else if (redir->src.set && !redir->src.any &&
 243                         !(redir->_src = fw3_lookup_zone(state, redir->src.name)))
 244         {
 245                 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
 246                                 redir->src.name);
 247                 return false;
 248         }
 249         else if (redir->dest.set && !redir->dest.any &&
 250                         !(redir->_dest = fw3_lookup_zone(state, redir->dest.name)))
 251         {
 252                 warn_section("redirect", redir, e, "refers to not existing zone '%s'",
 253                                 redir->dest.name);
 254                 return false;
 255         }
 256         else if (redir->ipset.set && state->disable_ipsets)
 257         {
 258                 warn_section("redirect", redir, e, "skipped due to disabled ipset support");
 259                 return false;
 260         }
 261         else if (redir->ipset.set &&
 262                         !(redir->ipset.ptr = fw3_lookup_ipset(state, redir->ipset.name)))
 263         {
 264                 warn_section("redirect", redir, e, "refers to unknown ipset '%s'",
 265                                 redir->ipset.name);
 266                 return false;
 267         }
 268         else if (redir->helper.set &&
 269                  !(redir->helper.ptr = fw3_lookup_cthelper(state, redir->helper.name)))
 270         {
 271                 warn_section("redirect", redir, e, "refers to unknown CT helper '%s'",
 272                              redir->helper.name);
 273                 return false;
 274         }
 275
 276         if (!check_families(e, redir))
 277                 return false;
 278
 279         if (redir->target == FW3_FLAG_UNSPEC)
 280         {
 281                 warn_section("redirect", redir, e, "has no target specified, defaulting to DNAT");
 282                 redir->target = FW3_FLAG_DNAT;
 283         }
 284         else if (redir->target < FW3_FLAG_DNAT || redir->target > FW3_FLAG_SNAT)
 285         {
 286                 warn_section("redirect", redir, e, "has invalid target specified, defaulting to DNAT");
 287                 redir->target = FW3_FLAG_DNAT;
 288         }
 289
 290         valid = false;
 291
 292         if (redir->target == FW3_FLAG_DNAT)
 293         {
 294                 if (redir->src.any)
 295                         warn_section("redirect", redir, e, "must not have source '*' for DNAT target");
 296                 else if (!redir->_src)
 297                         warn_section("redirect", redir, e, "has no source specified");
 298                 else if (redir->helper.invert)
 299                         warn_section("redirect", redir, e, "must not use a negated helper match");
 300                 else
 301                 {
 302                         set(redir->_src->flags, FW3_FAMILY_V4, redir->target);
 303                         valid = true;
 304
 305                         if (!check_local(e, redir, state) && !redir->dest.set &&
 306                                         resolve_dest(e, redir, state))
 307                         {
 308                                 warn_section("redirect", redir, e,
 309                                                 "does not specify a destination, assuming '%s'",
 310                                                 redir->dest.name);
 311                         }
 312
 313                         if (redir->reflection && redir->_dest && redir->_src->masq)
 314                         {
 315                                 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_ACCEPT);
 316                                 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_DNAT);
 317                                 set(redir->_dest->flags, FW3_FAMILY_V4, FW3_FLAG_SNAT);
 318                         }
 319
 320                         if (redir->helper.ptr)
 321                                 set(redir->_src->flags, FW3_FAMILY_V4, FW3_FLAG_HELPER);
 322                 }
 323         }
 324         else
 325         {
 326                 if (redir->dest.any)
 327                         warn_section("redirect", redir, e,
 328                                         "must not have destination '*' for SNAT target");
 329                 else if (!redir->_dest)
 330                         warn_section("redirect", redir, e, "has no destination specified");
 331                 else if (!redir->ip_dest.set)
 332                         warn_section("redirect", redir, e, "has no src_dip option specified");
 333                 else if (!list_empty(&redir->mac_src))
 334                         warn_section("redirect", redir, e, "must not use 'src_mac' option for SNAT target");
 335                 else if (redir->helper.set)
 336                         warn_section("redirect", redir, e, "must not use 'helper' option for SNAT target");
 337                 else
 338                 {
 339                         set(redir->_dest->flags, FW3_FAMILY_V4, redir->target);
 340                         valid = true;
 341                 }
 342         }
 343
 344         if (list_empty(&redir->proto))
 345         {
 346                 warn_section("redirect", redir, e, "does not specify a protocol, assuming TCP+UDP");
 347                 fw3_parse_protocol(&redir->proto, "tcpudp", true);
 348         }
 349
 350         if (!valid)
 351                 return false;
 352
 353         if (redir->target == FW3_FLAG_DNAT && !redir->port_redir.set)
 354                 redir->port_redir = redir->port_dest;
 355
 356         return true;
 357 }
 358
 359 static struct fw3_redirect *
 360 fw3_alloc_redirect(struct fw3_state *state)
 361 {
 362         struct fw3_redirect *redir;
 363
 364         redir = calloc(1, sizeof(*redir));
 365         if (!redir)
 366                 return NULL;
 367
 368         INIT_LIST_HEAD(&redir->proto);
 369         INIT_LIST_HEAD(&redir->mac_src);
 370         INIT_LIST_HEAD(&redir->reflection_zones);
 371
 372         redir->enabled = true;
 373         redir->reflection = true;
 374
 375         list_add_tail(&redir->list, &state->redirects);
 376
 377         return redir;
 378 }
 379
 380 void
 381 fw3_load_redirects(struct fw3_state *state, struct uci_package *p,
 382                 struct blob_attr *a)
 383 {
 384         struct uci_section *s;
 385         struct uci_element *e;
 386         struct fw3_redirect *redir;
 387         struct blob_attr *entry;
 388         unsigned rem;
 389
 390         INIT_LIST_HEAD(&state->redirects);
 391
 392         blob_for_each_attr(entry, a, rem)
 393         {
 394                 const char *type;
 395                 const char *name = "ubus redirect";
 396
 397                 if (!fw3_attr_parse_name_type(entry, &name, &type))
 398                         continue;
 399
 400                 if (strcmp(type, "redirect"))
 401                         continue;
 402
 403                 redir = fw3_alloc_redirect(state);
 404                 if (!redir)
 405                         continue;
 406
 407                 if (!fw3_parse_blob_options(redir, fw3_redirect_opts, entry, name))
 408                 {
 409                         warn_section("redirect", redir, NULL, "skipped due to invalid options");
 410                         fw3_free_redirect(redir);
 411                         continue;
 412                 }
 413
 414                 if (!check_redirect(state, redir, NULL)) {
 415                         fw3_free_redirect(redir);
 416                         continue;
 417                 }
 418
 419                 select_helper(state, redir);
 420         }
 421
 422         uci_foreach_element(&p->sections, e)
 423         {
 424                 s = uci_to_section(e);
 425
 426                 if (strcmp(s->type, "redirect"))
 427                         continue;
 428
 429                 redir = fw3_alloc_redirect(state);
 430                 if (!redir)
 431                         continue;
 432
 433                 if (!fw3_parse_options(redir, fw3_redirect_opts, s))
 434                 {
 435                         warn_elem(e, "skipped due to invalid options");
 436                         fw3_free_redirect(redir);
 437                         continue;
 438                 }
 439
 440                 if (!check_redirect(state, redir, e)) {
 441                         fw3_free_redirect(redir);
 442                         continue;
 443                 }
 444
 445                 select_helper(state, redir);
 446         }
 447 }
 448
 449 static void
 450 append_chain_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
 451 {
 452         if (redir->target == FW3_FLAG_DNAT)
 453                 fw3_ipt_rule_append(r, "zone_%s_prerouting", redir->src.name);
 454         else
 455                 fw3_ipt_rule_append(r, "zone_%s_postrouting", redir->dest.name);
 456 }
 457
 458 static void
 459 set_redirect(struct fw3_ipt_rule *r, struct fw3_port *port)
 460 {
 461         char buf[sizeof("65535-65535")];
 462
 463         fw3_ipt_rule_target(r, "REDIRECT");
 464
 465         if (port && port->set)
 466         {
 467                 if (port->port_min == port->port_max)
 468                         snprintf(buf, sizeof(buf), "%u", port->port_min);
 469                 else
 470                         snprintf(buf, sizeof(buf), "%u-%u", port->port_min, port->port_max);
 471
 472                 fw3_ipt_rule_addarg(r, false, "--to-ports", buf);
 473         }
 474 }
 475
 476 static void
 477 set_snat_dnat(struct fw3_ipt_rule *r, enum fw3_flag target,
 478               struct fw3_address *addr, struct fw3_port *port)
 479 {
 480         char buf[sizeof("255.255.255.255:65535-65535")] = {};
 481         char ip[INET_ADDRSTRLEN], *p = buf;
 482         size_t rem = sizeof(buf);
 483         int len;
 484
 485         if (addr && addr->set)
 486         {
 487                 inet_ntop(AF_INET, &addr->address.v4, ip, sizeof(ip));
 488
 489                 len = snprintf(p, rem, "%s", ip);
 490
 491                 if (len < 0 || len >= rem)
 492                         return;
 493
 494                 rem -= len;
 495                 p += len;
 496         }
 497
 498         if (port && port->set)
 499         {
 500                 if (port->port_min == port->port_max)
 501                         snprintf(p, rem, ":%u", port->port_min);
 502                 else
 503                         snprintf(p, rem, ":%u-%u", port->port_min, port->port_max);
 504         }
 505
 506         if (target == FW3_FLAG_DNAT)
 507         {
 508                 fw3_ipt_rule_target(r, "DNAT");
 509                 fw3_ipt_rule_addarg(r, false, "--to-destination", buf);
 510         }
 511         else
 512         {
 513                 fw3_ipt_rule_target(r, "SNAT");
 514                 fw3_ipt_rule_addarg(r, false, "--to-source", buf);
 515         }
 516 }
 517
 518 static void
 519 set_target_nat(struct fw3_ipt_rule *r, struct fw3_redirect *redir)
 520 {
 521         if (redir->local)
 522                 set_redirect(r, &redir->port_redir);
 523         else if (redir->target == FW3_FLAG_DNAT)
 524                 set_snat_dnat(r, redir->target, &redir->ip_redir, &redir->port_redir);
 525         else
 526                 set_snat_dnat(r, redir->target, &redir->ip_dest, &redir->port_dest);
 527 }
 528
 529 static void
 530 set_comment(struct fw3_ipt_rule *r, const char *name, int num, const char *suffix)
 531 {
 532         if (name)
 533         {
 534                 if (suffix)
 535                         fw3_ipt_rule_comment(r, "%s (%s)", name, suffix);
 536                 else
 537                         fw3_ipt_rule_comment(r, name);
 538         }
 539         else
 540         {
 541                 if (suffix)
 542                         fw3_ipt_rule_comment(r, "@redirect[%u] (%s)", num, suffix);
 543                 else
 544                         fw3_ipt_rule_comment(r, "@redirect[%u]", num);
 545         }
 546 }
 547
 548 static void
 549 print_redirect(struct fw3_ipt_handle *h, struct fw3_state *state,
 550                struct fw3_redirect *redir, int num,
 551                struct fw3_protocol *proto, struct fw3_mac *mac)
 552 {
 553         struct fw3_ipt_rule *r;
 554         struct fw3_address *src, *dst;
 555         struct fw3_port *spt, *dpt;
 556
 557         switch (h->table)
 558         {
 559         case FW3_TABLE_NAT:
 560                 src = &redir->ip_src;
 561                 dst = &redir->ip_dest;
 562                 spt = &redir->port_src;
 563                 dpt = &redir->port_dest;
 564
 565                 if (redir->target == FW3_FLAG_SNAT)
 566                 {
 567                         dst = &redir->ip_redir;
 568                         dpt = &redir->port_redir;
 569                 }
 570
 571                 r = fw3_ipt_rule_create(h, proto, NULL, NULL, src, dst);
 572                 fw3_ipt_rule_sport_dport(r, spt, dpt);
 573                 fw3_ipt_rule_mac(r, mac);
 574                 fw3_ipt_rule_ipset(r, &redir->ipset);
 575                 fw3_ipt_rule_helper(r, &redir->helper);
 576                 fw3_ipt_rule_limit(r, &redir->limit);
 577                 fw3_ipt_rule_time(r, &redir->time);
 578                 fw3_ipt_rule_mark(r, &redir->mark);
 579                 set_target_nat(r, redir);
 580                 fw3_ipt_rule_extra(r, redir->extra);
 581                 set_comment(r, redir->name, num, NULL);
 582                 append_chain_nat(r, redir);
 583                 break;
 584
 585         case FW3_TABLE_RAW:
 586                 if (redir->target == FW3_FLAG_DNAT && redir->helper.ptr)
 587                 {
 588                         if (!fw3_cthelper_check_proto(redir->helper.ptr, proto))
 589                         {
 590                                 info("     ! Skipping protocol %s since helper '%s' does not support it",
 591                                      fw3_protoname(proto), redir->helper.ptr->name);
 592                                 return;
 593                         }
 594
 595                         if (!redir->helper.set)
 596                                 info("     - Auto-selected conntrack helper '%s' based on proto/port",
 597                                      redir->helper.ptr->name);
 598
 599                         r = fw3_ipt_rule_create(h, proto, NULL, NULL, &redir->ip_src, &redir->ip_redir);
 600                         fw3_ipt_rule_sport_dport(r, &redir->port_src, &redir->port_redir);
 601                         fw3_ipt_rule_mac(r, mac);
 602                         fw3_ipt_rule_ipset(r, &redir->ipset);
 603                         fw3_ipt_rule_limit(r, &redir->limit);
 604                         fw3_ipt_rule_time(r, &redir->time);
 605                         fw3_ipt_rule_mark(r, &redir->mark);
 606                         fw3_ipt_rule_addarg(r, false, "-m", "conntrack");
 607                         fw3_ipt_rule_addarg(r, false, "--ctstate", "DNAT");
 608                         fw3_ipt_rule_target(r, "CT");
 609                         fw3_ipt_rule_addarg(r, false, "--helper", redir->helper.ptr->name);
 610                         set_comment(r, redir->name, num, "CT helper");
 611                         fw3_ipt_rule_append(r, "zone_%s_helper", redir->_src->name);
 612                 }
 613                 break;
 614
 615         default:
 616                 break;
 617         }
 618 }
 619
 620 static void
 621 print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
 622                  struct fw3_redirect *redir, int num,
 623                  struct fw3_protocol *proto, struct fw3_address *ra,
 624                  struct fw3_address *ia, struct fw3_address *ea, struct fw3_device *rz)
 625 {
 626         struct fw3_ipt_rule *r;
 627
 628         switch (h->table)
 629         {
 630         case FW3_TABLE_NAT:
 631                 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, ea);
 632                 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_dest);
 633                 fw3_ipt_rule_limit(r, &redir->limit);
 634                 fw3_ipt_rule_time(r, &redir->time);
 635                 set_comment(r, redir->name, num, "reflection");
 636                 set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
 637                 fw3_ipt_rule_replace(r, "zone_%s_prerouting", rz->name);
 638
 639                 r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
 640                 fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
 641                 fw3_ipt_rule_limit(r, &redir->limit);
 642                 fw3_ipt_rule_time(r, &redir->time);
 643                 set_comment(r, redir->name, num, "reflection");
 644                 set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
 645                 fw3_ipt_rule_replace(r, "zone_%s_postrouting", rz->name);
 646                 break;
 647
 648         default:
 649                 break;
 650         }
 651 }
 652
 653 static void
 654 expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
 655                 struct fw3_redirect *redir, int num)
 656 {
 657         struct list_head *ext_addrs, *int_addrs;
 658         struct fw3_address *ext_addr, *int_addr, ref_addr;
 659         struct fw3_protocol *proto;
 660         struct fw3_mac *mac;
 661         struct fw3_device *reflection_zone;
 662         struct fw3_zone *zone;
 663
 664         if (redir->name)
 665                 info("   * Redirect '%s'", redir->name);
 666         else
 667                 info("   * Redirect #%u", num);
 668
 669         if (!fw3_is_family(redir->_src, handle->family) ||
 670                 !fw3_is_family(redir->_dest, handle->family))
 671         {
 672                 info("     ! Skipping due to different family of zone");
 673                 return;
 674         }
 675
 676         if (!fw3_is_family(&redir->ip_src, handle->family) ||
 677             !fw3_is_family(&redir->ip_dest, handle->family) ||
 678                 !fw3_is_family(&redir->ip_redir, handle->family))
 679         {
 680                 if (!redir->ip_src.resolved ||
 681                     !redir->ip_dest.resolved ||
 682                     !redir->ip_redir.resolved)
 683                         info("     ! Skipping due to different family of ip address");
 684
 685                 return;
 686         }
 687
 688         if (redir->ipset.ptr)
 689         {
 690                 if (!fw3_is_family(redir->ipset.ptr, handle->family))
 691                 {
 692                         info("     ! Skipping due to different family in ipset");
 693                         return;
 694                 }
 695
 696                 if (!fw3_check_ipset(redir->ipset.ptr))
 697                 {
 698                         info("     ! Skipping due to missing ipset '%s'",
 699                              redir->ipset.ptr->external ?
 700                                         redir->ipset.ptr->external : redir->ipset.ptr->name);
 701                         return;
 702                 }
 703
 704                 set(redir->ipset.ptr->flags, handle->family, handle->family);
 705         }
 706
 707         fw3_foreach(proto, &redir->proto)
 708         fw3_foreach(mac, &redir->mac_src)
 709                 print_redirect(handle, state, redir, num, proto, mac);
 710
 711         /* reflection rules */
 712         if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
 713                 return;
 714
 715         if (!redir->_dest || !redir->_src->masq)
 716                 return;
 717
 718         ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
 719
 720         if (!ext_addrs)
 721                 goto out;
 722
 723         list_for_each_entry(ext_addr, ext_addrs, list)
 724         {
 725                 if (!fw3_is_family(ext_addr, handle->family))
 726                         continue;
 727
 728                 for (reflection_zone = list_empty(&redir->reflection_zones)
 729                        ? &redir->dest
 730                        : list_first_entry(&redir->reflection_zones, struct fw3_device, list);
 731                      list_empty(&redir->reflection_zones)
 732                        ? (reflection_zone == &redir->dest)
 733                        : (&reflection_zone->list != &redir->reflection_zones);
 734                      reflection_zone = list_empty(&redir->reflection_zones)
 735                        ? NULL
 736                        : list_entry(reflection_zone->list.next, struct fw3_device, list))
 737                 {
 738                         zone = fw3_lookup_zone(state, reflection_zone->name);
 739
 740                         if (!zone)
 741                                 continue;
 742
 743                         int_addrs = fw3_resolve_zone_addresses(zone, NULL);
 744                         list_for_each_entry(int_addr, int_addrs, list)
 745                         {
 746                                 if (!fw3_is_family(int_addr, handle->family))
 747                                         continue;
 748
 749                                 fw3_foreach(proto, &redir->proto)
 750                                 {
 751                                         if (!proto)
 752                                                 continue;
 753
 754                                         if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
 755                                                 ref_addr = *int_addr;
 756                                         else
 757                                                 ref_addr = *ext_addr;
 758
 759                                         ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
 760                                         ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
 761
 762                                         print_reflection(handle, state, redir, num, proto,
 763                                                          &ref_addr, int_addr, ext_addr, reflection_zone);
 764                                 }
 765                         }
 766                 }
 767         }
 768
 769 out:
 770         fw3_free_list(ext_addrs);
 771         fw3_free_list(int_addrs);
 772 }
 773
 774 void
 775 fw3_print_redirects(struct fw3_ipt_handle *handle, struct fw3_state *state)
 776 {
 777         int num = 0;
 778         struct fw3_redirect *redir;
 779
 780         if (handle->family == FW3_FAMILY_V6)
 781                 return;
 782
 783         if (handle->table != FW3_TABLE_FILTER &&
 784             handle->table != FW3_TABLE_NAT &&
 785             handle->table != FW3_TABLE_RAW)
 786                 return;
 787
 788         list_for_each_entry(redir, &state->redirects, list)
 789         {
 790                 if (handle->table == FW3_TABLE_RAW && !redir->helper.ptr)
 791                         continue;
 792
 793                 expand_redirect(handle, state, redir, num++);
 794         }
 795 }