iptables.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 "iptables.h"
  20
  21
  22 static struct option base_opts[] = {
  23         { .name = "match",  .has_arg = 1, .val = 'm' },
  24         { .name = "jump",   .has_arg = 1, .val = 'j' },
  25         { NULL }
  26 };
  27
  28 static struct xtables_globals xtg = {
  29         .option_offset = 0,
  30         .program_version = "4",
  31         .orig_opts = base_opts,
  32 #if XTABLES_VERSION_CODE > 10
  33         .compat_rev = xtables_compatible_revision,
  34 #endif
  35 };
  36
  37 static struct xtables_globals xtg6 = {
  38         .option_offset = 0,
  39         .program_version = "6",
  40         .orig_opts = base_opts,
  41 #if XTABLES_VERSION_CODE > 10
  42         .compat_rev = xtables_compatible_revision,
  43 #endif
  44 };
  45
  46 static struct {
  47         bool retain;
  48         int mcount, tcount;
  49         struct xtables_match **matches;
  50         struct xtables_target **targets;
  51         void (*register_match)(struct xtables_match *);
  52         void (*register_target)(struct xtables_target *);
  53 } xext;
  54
  55
  56 /* Required by certain extensions like SNAT and DNAT */
  57 int kernel_version = 0;
  58
  59 void
  60 get_kernel_version(void)
  61 {
  62         static struct utsname uts;
  63         int x = 0, y = 0, z = 0;
  64
  65         if (uname(&uts) == -1)
  66                 sprintf(uts.release, "3.0.0");
  67
  68         sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
  69         kernel_version = 0x10000 * x + 0x100 * y + z;
  70 }
  71
  72 static void fw3_init_extensions(void)
  73 {
  74         init_extensions();
  75         init_extensions4();
  76
  77 #ifndef DISABLE_IPV6
  78         init_extensions6();
  79 #endif
  80 }
  81
  82 struct fw3_ipt_handle *
  83 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
  84 {
  85         int i;
  86         struct fw3_ipt_handle *h;
  87
  88         h = fw3_alloc(sizeof(*h));
  89
  90         xtables_init();
  91
  92         if (family == FW3_FAMILY_V6)
  93         {
  94 #ifndef DISABLE_IPV6
  95                 h->family = FW3_FAMILY_V6;
  96                 h->table  = table;
  97                 h->handle = ip6tc_init(fw3_flag_names[table]);
  98
  99                 xtables_set_params(&xtg6);
 100                 xtables_set_nfproto(NFPROTO_IPV6);
 101 #endif
 102         }
 103         else
 104         {
 105                 h->family = FW3_FAMILY_V4;
 106                 h->table  = table;
 107                 h->handle = iptc_init(fw3_flag_names[table]);
 108
 109                 xtables_set_params(&xtg);
 110                 xtables_set_nfproto(NFPROTO_IPV4);
 111         }
 112
 113         if (!h->handle)
 114         {
 115                 free(h);
 116                 return NULL;
 117         }
 118
 119         fw3_xt_reset();
 120         fw3_init_extensions();
 121
 122         if (xext.register_match)
 123                 for (i = 0; i < xext.mcount; i++)
 124                         xext.register_match(xext.matches[i]);
 125
 126         if (xext.register_target)
 127                 for (i = 0; i < xext.tcount; i++)
 128                         xext.register_target(xext.targets[i]);
 129
 130         return h;
 131 }
 132
 133 static void
 134 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
 135 {
 136         va_list ap;
 137
 138         printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
 139                             fw3_flag_names[h->table]);
 140
 141         va_start(ap, fmt);
 142         vprintf(fmt, ap);
 143         va_end(ap);
 144 }
 145
 146 void
 147 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
 148                    enum fw3_flag policy)
 149 {
 150         if (fw3_pr_debug)
 151                 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
 152
 153 #ifndef DISABLE_IPV6
 154         if (h->family == FW3_FAMILY_V6)
 155                 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 156         else
 157 #endif
 158                 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 159 }
 160
 161 void
 162 fw3_ipt_flush_chain(struct fw3_ipt_handle *h, const char *chain)
 163 {
 164         if (fw3_pr_debug)
 165                 debug(h, "-F %s\n", chain);
 166
 167 #ifndef DISABLE_IPV6
 168         if (h->family == FW3_FAMILY_V6)
 169                 ip6tc_flush_entries(chain, h->handle);
 170         else
 171 #endif
 172                 iptc_flush_entries(chain, h->handle);
 173 }
 174
 175 static void
 176 delete_rules(struct fw3_ipt_handle *h, const char *target)
 177 {
 178         unsigned int num;
 179         const struct ipt_entry *e;
 180         const char *chain;
 181         const char *t;
 182         bool found;
 183
 184 #ifndef DISABLE_IPV6
 185         if (h->family == FW3_FAMILY_V6)
 186         {
 187                 for (chain = ip6tc_first_chain(h->handle);
 188                      chain != NULL;
 189                      chain = ip6tc_next_chain(h->handle))
 190                 {
 191                         do {
 192                                 found = false;
 193
 194                                 const struct ip6t_entry *e6;
 195                                 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
 196                                          e6 != NULL;
 197                                          num++, e6 = ip6tc_next_rule(e6, h->handle))
 198                                 {
 199                                         t = ip6tc_get_target(e6, h->handle);
 200
 201                                         if (*t && !strcmp(t, target))
 202                                         {
 203                                                 if (fw3_pr_debug)
 204                                                         debug(h, "-D %s %u\n", chain, num + 1);
 205
 206                                                 ip6tc_delete_num_entry(chain, num, h->handle);
 207                                                 found = true;
 208                                                 break;
 209                                         }
 210                                 }
 211                         } while (found);
 212                 }
 213         }
 214         else
 215 #endif
 216         {
 217                 for (chain = iptc_first_chain(h->handle);
 218                      chain != NULL;
 219                      chain = iptc_next_chain(h->handle))
 220                 {
 221                         do {
 222                                 found = false;
 223
 224                                 for (num = 0, e = iptc_first_rule(chain, h->handle);
 225                                      e != NULL;
 226                                          num++, e = iptc_next_rule(e, h->handle))
 227                                 {
 228                                         t = iptc_get_target(e, h->handle);
 229
 230                                         if (*t && !strcmp(t, target))
 231                                         {
 232                                                 if (fw3_pr_debug)
 233                                                         debug(h, "-D %s %u\n", chain, num + 1);
 234
 235                                                 iptc_delete_num_entry(chain, num, h->handle);
 236                                                 found = true;
 237                                                 break;
 238                                         }
 239                                 }
 240                         } while (found);
 241                 }
 242         }
 243 }
 244
 245 void
 246 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
 247 {
 248         delete_rules(h, chain);
 249
 250         if (fw3_pr_debug)
 251                 debug(h, "-X %s\n", chain);
 252
 253 #ifndef DISABLE_IPV6
 254         if (h->family == FW3_FAMILY_V6)
 255                 ip6tc_delete_chain(chain, h->handle);
 256         else
 257 #endif
 258                 iptc_delete_chain(chain, h->handle);
 259 }
 260
 261 static int
 262 get_rule_id(const void *base, unsigned int start, unsigned int end)
 263 {
 264         uint32_t id;
 265         unsigned int i;
 266         const struct xt_entry_match *em;
 267
 268         for (i = start; i < end; i += em->u.match_size)
 269         {
 270                 em = base + i;
 271
 272                 if (strcmp(em->u.user.name, "id"))
 273                         continue;
 274
 275                 memcpy(&id, em->data, sizeof(id));
 276
 277                 if ((id & FW3_ID_MASK) != FW3_ID_MAGIC)
 278                         continue;
 279
 280                 return (id & ~FW3_ID_MASK);
 281         }
 282
 283         return -1;
 284 }
 285
 286 void
 287 fw3_ipt_delete_id_rules(struct fw3_ipt_handle *h, const char *chain)
 288 {
 289         unsigned int num;
 290         const struct ipt_entry *e;
 291         bool found;
 292         int id;
 293
 294 #ifndef DISABLE_IPV6
 295         if (h->family == FW3_FAMILY_V6)
 296         {
 297                 if (!ip6tc_is_chain(chain, h->handle))
 298                         return;
 299
 300                 do {
 301                         found = false;
 302
 303                         const struct ip6t_entry *e6;
 304                         for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
 305                                  e6 != NULL;
 306                                  num++, e6 = ip6tc_next_rule(e6, h->handle))
 307                         {
 308                                 id = get_rule_id(e6, sizeof(*e6), e6->target_offset);
 309
 310                                 if (id >= 0)
 311                                 {
 312                                         if (fw3_pr_debug)
 313                                                 debug(h, "-D %s %u\n", chain, num + 1);
 314
 315                                         ip6tc_delete_num_entry(chain, num, h->handle);
 316                                         found = true;
 317                                         break;
 318                                 }
 319                         }
 320                 } while (found);
 321         }
 322         else
 323 #endif
 324         {
 325                 if (!iptc_is_chain(chain, h->handle))
 326                         return;
 327
 328                 do {
 329                         found = false;
 330
 331                         for (num = 0, e = iptc_first_rule(chain, h->handle);
 332                                  e != NULL;
 333                                  num++, e = iptc_next_rule(e, h->handle))
 334                         {
 335                                 id = get_rule_id(e, sizeof(*e), e->target_offset);
 336
 337                                 if (id >= 0)
 338                                 {
 339                                         if (fw3_pr_debug)
 340                                                 debug(h, "-D %s %u\n", chain, num + 1);
 341
 342                                         iptc_delete_num_entry(chain, num, h->handle);
 343                                         found = true;
 344                                         break;
 345                                 }
 346                         }
 347                 } while (found);
 348         }
 349 }
 350
 351 void
 352 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
 353 {
 354         char buf[32];
 355         va_list ap;
 356
 357         va_start(ap, fmt);
 358         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 359         va_end(ap);
 360
 361         if (fw3_pr_debug)
 362                 debug(h, "-N %s\n", buf);
 363
 364         iptc_create_chain(buf, h->handle);
 365 }
 366
 367 void
 368 fw3_ipt_flush(struct fw3_ipt_handle *h)
 369 {
 370         const char *chain;
 371
 372 #ifndef DISABLE_IPV6
 373         if (h->family == FW3_FAMILY_V6)
 374         {
 375                 for (chain = ip6tc_first_chain(h->handle);
 376                      chain != NULL;
 377                      chain = ip6tc_next_chain(h->handle))
 378                 {
 379                         ip6tc_flush_entries(chain, h->handle);
 380                 }
 381
 382                 for (chain = ip6tc_first_chain(h->handle);
 383                      chain != NULL;
 384                      chain = ip6tc_next_chain(h->handle))
 385                 {
 386                         ip6tc_delete_chain(chain, h->handle);
 387                 }
 388         }
 389         else
 390 #endif
 391         {
 392                 for (chain = iptc_first_chain(h->handle);
 393                      chain != NULL;
 394                      chain = iptc_next_chain(h->handle))
 395                 {
 396                         iptc_flush_entries(chain, h->handle);
 397                 }
 398
 399                 for (chain = iptc_first_chain(h->handle);
 400                      chain != NULL;
 401                      chain = iptc_next_chain(h->handle))
 402                 {
 403                         iptc_delete_chain(chain, h->handle);
 404                 }
 405         }
 406 }
 407
 408 static bool
 409 chain_is_empty(struct fw3_ipt_handle *h, const char *chain)
 410 {
 411 #ifndef DISABLE_IPV6
 412         if (h->family == FW3_FAMILY_V6)
 413                 return (!ip6tc_builtin(chain, h->handle) &&
 414                         !ip6tc_first_rule(chain, h->handle));
 415 #endif
 416
 417         return (!iptc_builtin(chain, h->handle) &&
 418                 !iptc_first_rule(chain, h->handle));
 419 }
 420
 421 void
 422 fw3_ipt_gc(struct fw3_ipt_handle *h)
 423 {
 424         const char *chain;
 425         bool found;
 426
 427 #ifndef DISABLE_IPV6
 428         if (h->family == FW3_FAMILY_V6)
 429         {
 430                 do {
 431                         found = false;
 432
 433                         for (chain = ip6tc_first_chain(h->handle);
 434                                  chain != NULL;
 435                                  chain = ip6tc_next_chain(h->handle))
 436                         {
 437                                 if (!chain_is_empty(h, chain))
 438                                         continue;
 439
 440                                 fw3_ipt_delete_chain(h, chain);
 441                                 found = true;
 442                                 break;
 443                         }
 444                 } while(found);
 445         }
 446         else
 447 #endif
 448         {
 449                 do {
 450                         found = false;
 451
 452                         for (chain = iptc_first_chain(h->handle);
 453                                  chain != NULL;
 454                                  chain = iptc_next_chain(h->handle))
 455                         {
 456                                 warn("C=%s\n", chain);
 457
 458                                 if (!chain_is_empty(h, chain))
 459                                         continue;
 460
 461                                 warn("D=%s\n", chain);
 462
 463                                 fw3_ipt_delete_chain(h, chain);
 464                                 found = true;
 465                                 break;
 466                         }
 467                 } while (found);
 468         }
 469 }
 470
 471 void
 472 fw3_ipt_commit(struct fw3_ipt_handle *h)
 473 {
 474         int rv;
 475
 476 #ifndef DISABLE_IPV6
 477         if (h->family == FW3_FAMILY_V6)
 478         {
 479                 rv = ip6tc_commit(h->handle);
 480                 if (!rv)
 481                         warn("ip6tc_commit(): %s", ip6tc_strerror(errno));
 482         }
 483         else
 484 #endif
 485         {
 486                 rv = iptc_commit(h->handle);
 487                 if (!rv)
 488                         warn("iptc_commit(): %s", iptc_strerror(errno));
 489         }
 490 }
 491
 492 void
 493 fw3_ipt_close(struct fw3_ipt_handle *h)
 494 {
 495         free(h);
 496 }
 497
 498 struct fw3_ipt_rule *
 499 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
 500 {
 501         struct fw3_ipt_rule *r;
 502
 503         r = fw3_alloc(sizeof(*r));
 504
 505         r->h = h;
 506         r->id = 0;
 507         r->argv = fw3_alloc(sizeof(char *));
 508         r->argv[r->argc++] = "fw3";
 509
 510         return r;
 511 }
 512
 513
 514 static bool
 515 is_chain(struct fw3_ipt_handle *h, const char *name)
 516 {
 517 #ifndef DISABLE_IPV6
 518         if (h->family == FW3_FAMILY_V6)
 519                 return ip6tc_is_chain(name, h->handle);
 520         else
 521 #endif
 522                 return iptc_is_chain(name, h->handle);
 523 }
 524
 525 static char *
 526 get_protoname(struct fw3_ipt_rule *r)
 527 {
 528         const struct xtables_pprot *pp;
 529
 530         if (r->protocol)
 531                 for (pp = xtables_chain_protos; pp->name; pp++)
 532                         if (pp->num == r->protocol)
 533                                 return (char *)pp->name;
 534
 535         return NULL;
 536 }
 537
 538 static struct xtables_match *
 539 find_match(struct fw3_ipt_rule *r, const char *name)
 540 {
 541         struct xtables_match *m;
 542
 543         xext.retain = true;
 544         m = xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
 545         xext.retain = false;
 546
 547         return m;
 548 }
 549
 550 static void
 551 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
 552 {
 553         size_t s;
 554         struct xtables_globals *g;
 555
 556         if (!m)
 557                 return;
 558
 559         s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
 560
 561         m->m = fw3_alloc(s);
 562
 563         fw3_xt_set_match_name(m);
 564
 565         m->m->u.user.revision = m->revision;
 566         m->m->u.match_size = s;
 567
 568         /* free previous userspace data */
 569         fw3_xt_free_match_udata(m);
 570
 571         if (m->init)
 572                 m->init(m->m);
 573
 574         /* don't merge options if no_clone is set and this match is a clone */
 575         if (no_clone && (m == m->next))
 576                 return;
 577
 578         /* merge option table */
 579         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 580         fw3_xt_merge_match_options(g, m);
 581 }
 582
 583 static bool
 584 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
 585 {
 586         if (!pname)
 587                 return false;
 588
 589         if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
 590                 return true;
 591
 592         return !r->protocol_loaded;
 593 }
 594
 595 static struct xtables_match *
 596 load_protomatch(struct fw3_ipt_rule *r)
 597 {
 598         const char *pname = get_protoname(r);
 599
 600         if (!need_protomatch(r, pname))
 601                 return NULL;
 602
 603         return find_match(r, pname);
 604 }
 605
 606 static struct xtables_target *
 607 find_target(struct fw3_ipt_rule *r, const char *name)
 608 {
 609         struct xtables_target *t;
 610
 611         xext.retain = true;
 612
 613         if (is_chain(r->h, name))
 614                 t = xtables_find_target(XT_STANDARD_TARGET, XTF_TRY_LOAD);
 615         else
 616                 t = xtables_find_target(name, XTF_TRY_LOAD);
 617
 618         xext.retain = false;
 619
 620         return t;
 621 }
 622
 623 static struct xtables_target *
 624 get_target(struct fw3_ipt_rule *r, const char *name)
 625 {
 626         size_t s;
 627         struct xtables_target *t;
 628         struct xtables_globals *g;
 629
 630         t = find_target(r, name);
 631
 632         if (!t)
 633                 return NULL;
 634
 635         s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
 636         t->t = fw3_alloc(s);
 637
 638         fw3_xt_set_target_name(t, name);
 639
 640         t->t->u.user.revision = t->revision;
 641         t->t->u.target_size = s;
 642
 643         /* free previous userspace data */
 644         fw3_xt_free_target_udata(t);
 645
 646         if (t->init)
 647                 t->init(t->t);
 648
 649         /* merge option table */
 650         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 651         fw3_xt_merge_target_options(g, t);
 652
 653         r->target = t;
 654
 655         return t;
 656 }
 657
 658 void
 659 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
 660 {
 661         uint32_t pr;
 662
 663         if (!proto || proto->any)
 664                 return;
 665
 666         pr = proto->protocol;
 667
 668 #ifndef DISABLE_IPV6
 669         if (r->h->family == FW3_FAMILY_V6)
 670         {
 671                 if (pr == 1)
 672                         pr = 58;
 673
 674                 r->e6.ipv6.proto = pr;
 675                 r->e6.ipv6.flags |= IP6T_F_PROTO;
 676
 677                 if (proto->invert)
 678                         r->e6.ipv6.invflags |= XT_INV_PROTO;
 679         }
 680         else
 681 #endif
 682         {
 683                 r->e.ip.proto = pr;
 684
 685                 if (proto->invert)
 686                         r->e.ip.invflags |= XT_INV_PROTO;
 687         }
 688
 689         r->protocol = pr;
 690 }
 691
 692 void
 693 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 694                     struct fw3_device *in, struct fw3_device *out)
 695 {
 696 #ifndef DISABLE_IPV6
 697         if (r->h->family == FW3_FAMILY_V6)
 698         {
 699                 if (in && !in->any)
 700                 {
 701                         xtables_parse_interface(in->name, r->e6.ipv6.iniface,
 702                                                           r->e6.ipv6.iniface_mask);
 703
 704                         if (in->invert)
 705                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
 706                 }
 707
 708                 if (out && !out->any)
 709                 {
 710                         xtables_parse_interface(out->name, r->e6.ipv6.outiface,
 711                                                            r->e6.ipv6.outiface_mask);
 712
 713                         if (out->invert)
 714                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
 715                 }
 716         }
 717         else
 718 #endif
 719         {
 720                 if (in && !in->any)
 721                 {
 722                         xtables_parse_interface(in->name, r->e.ip.iniface,
 723                                                           r->e.ip.iniface_mask);
 724
 725                         if (in->invert)
 726                                 r->e.ip.invflags |= IPT_INV_VIA_IN;
 727                 }
 728
 729                 if (out && !out->any)
 730                 {
 731                         xtables_parse_interface(out->name, r->e.ip.outiface,
 732                                                            r->e.ip.outiface_mask);
 733
 734                         if (out->invert)
 735                                 r->e.ip.invflags |= IPT_INV_VIA_OUT;
 736                 }
 737         }
 738 }
 739
 740
 741 void
 742 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 743                       struct fw3_address *src, struct fw3_address *dest)
 744 {
 745         if ((src && src->range) || (dest && dest->range))
 746         {
 747                 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
 748         }
 749
 750         if (src && src->set)
 751         {
 752                 if (src->range)
 753                 {
 754                         fw3_ipt_rule_addarg(r, src->invert, "--src-range",
 755                                             fw3_address_to_string(src, false, false));
 756                 }
 757 #ifndef DISABLE_IPV6
 758                 else if (r->h->family == FW3_FAMILY_V6)
 759                 {
 760                         r->e6.ipv6.src = src->address.v6;
 761                         r->e6.ipv6.smsk = src->mask.v6;
 762
 763                         int i;
 764                         for (i = 0; i < 4; i++)
 765                                 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
 766
 767                         if (src->invert)
 768                                 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
 769                 }
 770 #endif
 771                 else
 772                 {
 773                         r->e.ip.src = src->address.v4;
 774                         r->e.ip.smsk = src->mask.v4;
 775
 776                         r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
 777
 778                         if (src->invert)
 779                                 r->e.ip.invflags |= IPT_INV_SRCIP;
 780                 }
 781         }
 782
 783         if (dest && dest->set)
 784         {
 785                 if (dest->range)
 786                 {
 787                         fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
 788                                             fw3_address_to_string(dest, false, false));
 789                 }
 790 #ifndef DISABLE_IPV6
 791                 else if (r->h->family == FW3_FAMILY_V6)
 792                 {
 793                         r->e6.ipv6.dst = dest->address.v6;
 794                         r->e6.ipv6.dmsk = dest->mask.v6;
 795
 796                         int i;
 797                         for (i = 0; i < 4; i++)
 798                                 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
 799
 800                         if (dest->invert)
 801                                 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
 802                 }
 803 #endif
 804                 else
 805                 {
 806                         r->e.ip.dst = dest->address.v4;
 807                         r->e.ip.dmsk = dest->mask.v4;
 808
 809                         r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
 810
 811                         if (dest->invert)
 812                                 r->e.ip.invflags |= IPT_INV_DSTIP;
 813                 }
 814         }
 815 }
 816
 817 void
 818 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 819                          struct fw3_port *sp, struct fw3_port *dp)
 820 {
 821         char buf[sizeof("65535:65535\0")];
 822
 823         if ((!sp || !sp->set) && (!dp || !dp->set))
 824                 return;
 825
 826         if (!get_protoname(r))
 827                 return;
 828
 829         if (sp && sp->set)
 830         {
 831                 if (sp->port_min == sp->port_max)
 832                         sprintf(buf, "%u", sp->port_min);
 833                 else
 834                         sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
 835
 836                 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
 837         }
 838
 839         if (dp && dp->set)
 840         {
 841                 if (dp->port_min == dp->port_max)
 842                         sprintf(buf, "%u", dp->port_min);
 843                 else
 844                         sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
 845
 846                 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
 847         }
 848 }
 849
 850 void
 851 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
 852 {
 853         if (device) {
 854                 struct fw3_device dev = { .any = false };
 855                 strncpy(dev.name, device, sizeof(dev.name) - 1);
 856                 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
 857         }
 858 }
 859
 860 void
 861 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
 862 {
 863         char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
 864         uint8_t *addr = mac->mac.ether_addr_octet;
 865
 866         if (!mac)
 867                 return;
 868
 869         sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
 870                 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 871
 872         fw3_ipt_rule_addarg(r, false, "-m", "mac");
 873         fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
 874 }
 875
 876 void
 877 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
 878 {
 879         char buf[sizeof("255/255\0")];
 880
 881         if (!icmp)
 882                 return;
 883
 884 #ifndef DISABLE_IPV6
 885         if (r->h->family == FW3_FAMILY_V6)
 886         {
 887                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
 888                         sprintf(buf, "%u", icmp->type6);
 889                 else
 890                         sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
 891
 892                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
 893         }
 894         else
 895 #endif
 896         {
 897                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
 898                         sprintf(buf, "%u", icmp->type);
 899                 else
 900                         sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
 901
 902                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
 903         }
 904 }
 905
 906 void
 907 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
 908 {
 909         char buf[sizeof("-4294967296/second\0")];
 910
 911         if (!limit || limit->rate <= 0)
 912                 return;
 913
 914         fw3_ipt_rule_addarg(r, false, "-m", "limit");
 915
 916         sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
 917         fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
 918
 919         if (limit->burst > 0)
 920         {
 921                 sprintf(buf, "%u", limit->burst);
 922                 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
 923         }
 924 }
 925
 926 void
 927 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
 928 {
 929         char buf[sizeof("dst,dst,dst\0")];
 930         char *p = buf;
 931         int i = 0;
 932
 933         struct fw3_ipset *set;
 934         struct fw3_ipset_datatype *type;
 935
 936         if (!match || !match->set || !match->ptr)
 937                 return;
 938
 939         set = match->ptr;
 940         list_for_each_entry(type, &set->datatypes, list)
 941         {
 942                 if (i >= 3)
 943                         break;
 944
 945                 if (p > buf)
 946                         *p++ = ',';
 947
 948                 p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
 949                 i++;
 950         }
 951
 952         fw3_ipt_rule_addarg(r, false, "-m", "set");
 953
 954         fw3_ipt_rule_addarg(r, match->invert, "--match-set",
 955                             set->external ? set->external : set->name);
 956
 957         fw3_ipt_rule_addarg(r, false, buf, NULL);
 958 }
 959
 960 void
 961 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
 962 {
 963         int i;
 964         struct tm empty = { 0 };
 965
 966         char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
 967         char *p;
 968
 969         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
 970         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 971
 972         if (!d1 && !d2 && !time->timestart && !time->timestop &&
 973             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
 974         {
 975                 return;
 976         }
 977
 978         fw3_ipt_rule_addarg(r, false, "-m", "time");
 979
 980         if (time->utc)
 981                 fw3_ipt_rule_addarg(r, false, "--utc", NULL);
 982
 983         if (d1)
 984         {
 985                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
 986                 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
 987         }
 988
 989         if (d2)
 990         {
 991                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
 992                 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
 993         }
 994
 995         if (time->timestart)
 996         {
 997                 sprintf(buf, "%02d:%02d:%02d",
 998                         time->timestart / 3600,
 999                         time->timestart % 3600 / 60,
1000                         time->timestart % 60);
1001
1002                 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
1003         }
1004
1005         if (time->timestop)
1006         {
1007                 sprintf(buf, "%02d:%02d:%02d",
1008                         time->timestop / 3600,
1009                         time->timestop % 3600 / 60,
1010                         time->timestop % 60);
1011
1012                 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
1013         }
1014
1015         if (time->monthdays & 0xFFFFFFFE)
1016         {
1017                 for (i = 1, p = buf; i < 32; i++)
1018                 {
1019                         if (fw3_hasbit(time->monthdays, i))
1020                         {
1021                                 if (p > buf)
1022                                         *p++ = ',';
1023
1024                                 p += sprintf(p, "%u", i);
1025                         }
1026                 }
1027
1028                 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
1029         }
1030
1031         if (time->weekdays & 0xFE)
1032         {
1033                 for (i = 1, p = buf; i < 8; i++)
1034                 {
1035                         if (fw3_hasbit(time->weekdays, i))
1036                         {
1037                                 if (p > buf)
1038                                         *p++ = ',';
1039
1040                                 p += sprintf(p, "%u", i);
1041                         }
1042                 }
1043
1044                 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
1045         }
1046 }
1047
1048 void
1049 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
1050 {
1051         char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
1052
1053         if (!mark || !mark->set)
1054                 return;
1055
1056         if (mark->mask < 0xFFFFFFFF)
1057                 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
1058         else
1059                 sprintf(buf, "0x%x", mark->mark);
1060
1061         fw3_ipt_rule_addarg(r, false, "-m", "mark");
1062         fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
1063 }
1064
1065 void
1066 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
1067 {
1068         va_list ap;
1069         char buf[256];
1070
1071         if (!fmt || !*fmt)
1072                 return;
1073
1074         va_start(ap, fmt);
1075         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1076         va_end(ap);
1077
1078         fw3_ipt_rule_addarg(r, false, "-m", "comment");
1079         fw3_ipt_rule_addarg(r, false, "--comment", buf);
1080 }
1081
1082 void
1083 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
1084 {
1085         char *p, **tmp, *s;
1086
1087         if (!extra || !*extra)
1088                 return;
1089
1090         s = fw3_strdup(extra);
1091
1092         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
1093         {
1094                 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
1095
1096                 if (!tmp)
1097                         break;
1098
1099                 r->argv = tmp;
1100                 r->argv[r->argc++] = fw3_strdup(p);
1101         }
1102
1103         free(s);
1104 }
1105
1106 #ifndef DISABLE_IPV6
1107 static void
1108 rule_print6(struct ip6t_entry *e)
1109 {
1110         char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
1111         char *pname;
1112
1113         if (e->ipv6.flags & IP6T_F_PROTO)
1114         {
1115                 if (e->ipv6.invflags & XT_INV_PROTO)
1116                         printf(" !");
1117
1118                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
1119
1120                 if (pname)
1121                         printf(" -p %s", pname);
1122                 else
1123                         printf(" -p %u", e->ipv6.proto);
1124         }
1125
1126         if (e->ipv6.iniface[0])
1127         {
1128                 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
1129                         printf(" !");
1130
1131                 printf(" -i %s", e->ipv6.iniface);
1132         }
1133
1134         if (e->ipv6.outiface[0])
1135         {
1136                 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
1137                         printf(" !");
1138
1139                 printf(" -o %s", e->ipv6.outiface);
1140         }
1141
1142         if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1143         {
1144                 if (e->ipv6.invflags & IP6T_INV_SRCIP)
1145                         printf(" !");
1146
1147                 printf(" -s %s/%s",
1148                        inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
1149                        inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
1150         }
1151
1152         if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1153         {
1154                 if (e->ipv6.invflags & IP6T_INV_DSTIP)
1155                         printf(" !");
1156
1157                 printf(" -d %s/%s",
1158                        inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
1159                        inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
1160         }
1161 }
1162 #endif
1163
1164 static void
1165 rule_print4(struct ipt_entry *e)
1166 {
1167         struct in_addr in_zero = { 0 };
1168         char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
1169         char *pname;
1170
1171         if (e->ip.proto)
1172         {
1173                 if (e->ip.invflags & XT_INV_PROTO)
1174                         printf(" !");
1175
1176                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1177
1178                 if (pname)
1179                         printf(" -p %s", pname);
1180                 else
1181                         printf(" -p %u", e->ip.proto);
1182         }
1183
1184         if (e->ip.iniface[0])
1185         {
1186                 if (e->ip.invflags & IPT_INV_VIA_IN)
1187                         printf(" !");
1188
1189                 printf(" -i %s", e->ip.iniface);
1190         }
1191
1192         if (e->ip.outiface[0])
1193         {
1194                 if (e->ip.invflags & IPT_INV_VIA_OUT)
1195                         printf(" !");
1196
1197                 printf(" -o %s", e->ip.outiface);
1198         }
1199
1200         if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1201         {
1202                 if (e->ip.invflags & IPT_INV_SRCIP)
1203                         printf(" !");
1204
1205                 printf(" -s %s/%s",
1206                        inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
1207                        inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
1208         }
1209
1210         if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1211         {
1212                 if (e->ip.invflags & IPT_INV_DSTIP)
1213                         printf(" !");
1214
1215                 printf(" -d %s/%s",
1216                        inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
1217                        inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
1218         }
1219 }
1220
1221 static void
1222 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
1223 {
1224         debug(r->h, "%s %s", prefix, chain);
1225
1226 #ifndef DISABLE_IPV6
1227         if (r->h->family == FW3_FAMILY_V6)
1228                 rule_print6(&r->e6);
1229         else
1230 #endif
1231                 rule_print4(&r->e);
1232
1233         fw3_xt_print_matches(&r->e.ip, r->matches);
1234         fw3_xt_print_target(&r->e.ip, r->target);
1235
1236         printf("\n");
1237 }
1238
1239 static bool
1240 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1241 {
1242         struct xtables_rule_match *m;
1243         struct xtables_match *em;
1244
1245         /* is a target option */
1246         if (r->target && fw3_xt_has_target_parse(r->target) &&
1247                 optc >= r->target->option_offset &&
1248                 optc < (r->target->option_offset + 256))
1249         {
1250                 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1251                 return false;
1252         }
1253
1254         /* try to dispatch argument to one of the match parsers */
1255         for (m = r->matches; m; m = m->next)
1256         {
1257                 em = m->match;
1258
1259                 if (m->completed || !fw3_xt_has_match_parse(em))
1260                         continue;
1261
1262                 if (optc < em->option_offset ||
1263                         optc >= (em->option_offset + 256))
1264                         continue;
1265
1266                 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1267                 return false;
1268         }
1269
1270         /* unhandled option, might belong to a protocol match */
1271         if ((em = load_protomatch(r)) != NULL)
1272         {
1273                 init_match(r, em, false);
1274
1275                 r->protocol_loaded = true;
1276                 optind--;
1277
1278                 return true;
1279         }
1280
1281         if (optc == ':')
1282                 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
1283
1284         if (optc == '?')
1285                 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
1286
1287         return false;
1288 }
1289
1290 void
1291 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1292                     const char *k, const char *v)
1293 {
1294         int n;
1295         char **tmp;
1296
1297         if (!k)
1298                 return;
1299
1300         n = inv + !!k + !!v;
1301         tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1302
1303         if (!tmp)
1304                 return;
1305
1306         r->argv = tmp;
1307
1308         if (inv)
1309                 r->argv[r->argc++] = fw3_strdup("!");
1310
1311         r->argv[r->argc++] = fw3_strdup(k);
1312
1313         if (v)
1314                 r->argv[r->argc++] = fw3_strdup(v);
1315 }
1316
1317 static unsigned char *
1318 rule_mask(struct fw3_ipt_rule *r)
1319 {
1320         size_t s;
1321         unsigned char *p, *mask = NULL;
1322         struct xtables_rule_match *m;
1323
1324 #define SZ(x) XT_ALIGN(sizeof(struct x))
1325
1326 #ifndef DISABLE_IPV6
1327         if (r->h->family == FW3_FAMILY_V6)
1328         {
1329                 s = SZ(ip6t_entry);
1330
1331                 for (m = r->matches; m; m = m->next)
1332                         s += SZ(ip6t_entry_match) + m->match->size;
1333
1334                 s += SZ(ip6t_entry_target);
1335                 if (r->target)
1336                         s += r->target->size;
1337
1338                 mask = fw3_alloc(s);
1339                 memset(mask, 0xFF, SZ(ip6t_entry));
1340                 p = mask + SZ(ip6t_entry);
1341
1342                 for (m = r->matches; m; m = m->next)
1343                 {
1344                         memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
1345                         p += SZ(ip6t_entry_match) + m->match->size;
1346                 }
1347
1348                 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target) ? r->target->userspacesize : 0);
1349         }
1350         else
1351 #endif
1352         {
1353                 s = SZ(ipt_entry);
1354
1355                 for (m = r->matches; m; m = m->next)
1356                         s += SZ(ipt_entry_match) + m->match->size;
1357
1358                 s += SZ(ipt_entry_target);
1359                 if (r->target)
1360                         s += r->target->size;
1361
1362                 mask = fw3_alloc(s);
1363                 memset(mask, 0xFF, SZ(ipt_entry));
1364                 p = mask + SZ(ipt_entry);
1365
1366                 for (m = r->matches; m; m = m->next)
1367                 {
1368                         memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
1369                         p += SZ(ipt_entry_match) + m->match->size;
1370                 }
1371
1372                 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target) ? r->target->userspacesize : 0);
1373         }
1374
1375         return mask;
1376 }
1377
1378 static void *
1379 rule_build(struct fw3_ipt_rule *r)
1380 {
1381         size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
1382         struct xtables_rule_match *m;
1383
1384 #ifndef DISABLE_IPV6
1385         if (r->h->family == FW3_FAMILY_V6)
1386         {
1387                 struct ip6t_entry *e6;
1388
1389                 s = XT_ALIGN(sizeof(struct ip6t_entry));
1390
1391                 for (m = r->matches; m; m = m->next)
1392                         s += m->match->m->u.match_size;
1393
1394                 e6 = fw3_alloc(s + target_size);
1395
1396                 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1397
1398                 e6->target_offset = s;
1399                 e6->next_offset = s + target_size;
1400
1401                 s = 0;
1402
1403                 for (m = r->matches; m; m = m->next)
1404                 {
1405                         memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1406                         s += m->match->m->u.match_size;
1407                 }
1408
1409                 if (target_size)
1410                         memcpy(e6->elems + s, r->target->t, target_size);
1411
1412                 return e6;
1413         }
1414         else
1415 #endif
1416         {
1417                 struct ipt_entry *e;
1418
1419                 s = XT_ALIGN(sizeof(struct ipt_entry));
1420
1421                 for (m = r->matches; m; m = m->next)
1422                         s += m->match->m->u.match_size;
1423
1424                 e = fw3_alloc(s + target_size);
1425
1426                 memcpy(e, &r->e, sizeof(struct ipt_entry));
1427
1428                 e->target_offset = s;
1429                 e->next_offset = s + target_size;
1430
1431                 s = 0;
1432
1433                 for (m = r->matches; m; m = m->next)
1434                 {
1435                         memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1436                         s += m->match->m->u.match_size;
1437                 }
1438
1439                 if (target_size)
1440                         memcpy(e->elems + s, r->target->t, target_size);
1441
1442                 return e;
1443         }
1444 }
1445
1446 void
1447 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
1448 {
1449         void *rule;
1450         unsigned char *mask;
1451
1452         struct xtables_rule_match *m;
1453         struct xtables_match *em;
1454         struct xtables_target *et;
1455         struct xtables_globals *g;
1456
1457         int i, optc;
1458         uint32_t id;
1459         bool inv = false;
1460         char buf[32];
1461         va_list ap;
1462
1463         va_start(ap, fmt);
1464         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1465         va_end(ap);
1466
1467         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1468         g->opts = g->orig_opts;
1469
1470         optind = 0;
1471         opterr = 0;
1472
1473         if (r->id >= 0)
1474         {
1475                 em = find_match(r, "id");
1476
1477                 if (!em)
1478                 {
1479                         warn("fw3_ipt_rule_append(): Can't find match '%s'", "id");
1480                         goto free;
1481                 }
1482
1483                 init_match(r, em, true);
1484
1485                 id = FW3_ID_MAGIC | (r->id & ~FW3_ID_MASK);
1486                 memcpy(em->m->data, &id, sizeof(id));
1487
1488                 em->mflags = 1;
1489         }
1490
1491         while ((optc = getopt_long(r->argc, r->argv, "-:m:j:", g->opts,
1492                                    NULL)) != -1)
1493         {
1494                 switch (optc)
1495                 {
1496                 case 'm':
1497                         em = find_match(r, optarg);
1498
1499                         if (!em)
1500                         {
1501                                 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
1502                                 goto free;
1503                         }
1504
1505                         init_match(r, em, true);
1506                         break;
1507
1508                 case 'j':
1509                         et = get_target(r, optarg);
1510
1511                         if (!et)
1512                         {
1513                                 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
1514                                 goto free;
1515                         }
1516
1517                         break;
1518
1519                 case 1:
1520                         if ((optarg[0] == '!') && (optarg[1] == '\0'))
1521                         {
1522                                 optarg[0] = '\0';
1523                                 inv = true;
1524                                 continue;
1525                         }
1526
1527                         warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1528                         goto free;
1529
1530                 default:
1531                         if (parse_option(r, optc, inv))
1532                                 continue;
1533                         break;
1534                 }
1535
1536                 inv = false;
1537         }
1538
1539         for (m = r->matches; m; m = m->next)
1540                 xtables_option_mfcall(m->match);
1541
1542         if (r->target)
1543                 xtables_option_tfcall(r->target);
1544
1545         rule = rule_build(r);
1546
1547 #ifndef DISABLE_IPV6
1548         if (r->h->family == FW3_FAMILY_V6)
1549         {
1550                 if (repl)
1551                 {
1552                         mask = rule_mask(r);
1553
1554                         while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
1555                                 if (fw3_pr_debug)
1556                                         rule_print(r, "-D", buf);
1557
1558                         free(mask);
1559                 }
1560
1561                 if (fw3_pr_debug)
1562                         rule_print(r, "-A", buf);
1563
1564                 if (!ip6tc_append_entry(buf, rule, r->h->handle))
1565                         warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
1566         }
1567         else
1568 #endif
1569         {
1570                 if (repl)
1571                 {
1572                         mask = rule_mask(r);
1573
1574                         while (iptc_delete_entry(buf, rule, mask, r->h->handle))
1575                                 if (fw3_pr_debug)
1576                                         rule_print(r, "-D", buf);
1577
1578                         free(mask);
1579                 }
1580
1581                 if (fw3_pr_debug)
1582                         rule_print(r, "-A", buf);
1583
1584                 if (!iptc_append_entry(buf, rule, r->h->handle))
1585                         warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
1586         }
1587
1588         free(rule);
1589
1590 free:
1591         for (i = 1; i < r->argc; i++)
1592                 free(r->argv[i]);
1593
1594         free(r->argv);
1595
1596         xtables_rule_matches_free(&r->matches);
1597
1598         if (r->target)
1599                 free(r->target->t);
1600
1601         free(r);
1602
1603         /* reset all targets and matches */
1604         for (em = xtables_matches; em; em = em->next)
1605                 em->mflags = 0;
1606
1607         for (et = xtables_targets; et; et = et->next)
1608         {
1609                 et->tflags = 0;
1610                 et->used = 0;
1611         }
1612
1613         xtables_free_opts(1);
1614 }
1615
1616 struct fw3_ipt_rule *
1617 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1618                     struct fw3_device *in, struct fw3_device *out,
1619                     struct fw3_address *src, struct fw3_address *dest)
1620 {
1621         struct fw3_ipt_rule *r;
1622
1623         r = fw3_ipt_rule_new(handle);
1624
1625         fw3_ipt_rule_proto(r, proto);
1626         fw3_ipt_rule_in_out(r, in, out);
1627         fw3_ipt_rule_src_dest(r, src, dest);
1628
1629         return r;
1630 }
1631
1632 void
1633 xtables_register_match(struct xtables_match *me)
1634 {
1635         int i;
1636         static struct xtables_match **tmp;
1637
1638         if (!xext.register_match)
1639                 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
1640
1641         if (!xext.register_match)
1642                 return;
1643
1644         xext.register_match(me);
1645
1646         if (xext.retain)
1647         {
1648                 for (i = 0; i < xext.mcount; i++)
1649                         if (xext.matches[i] == me)
1650                                 return;
1651
1652                 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
1653
1654                 if (!tmp)
1655                         return;
1656
1657                 xext.matches = tmp;
1658                 xext.matches[xext.mcount++] = me;
1659         }
1660 }
1661
1662 void
1663 xtables_register_target(struct xtables_target *me)
1664 {
1665         int i;
1666         static struct xtables_target **tmp;
1667
1668         if (!xext.register_target)
1669                 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
1670
1671         if (!xext.register_target)
1672                 return;
1673
1674         xext.register_target(me);
1675
1676         if (xext.retain)
1677         {
1678                 for (i = 0; i < xext.tcount; i++)
1679                         if (xext.targets[i] == me)
1680                                 return;
1681
1682                 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
1683
1684                 if (!tmp)
1685                         return;
1686
1687                 xext.targets = tmp;
1688                 xext.targets[xext.tcount++] = me;
1689         }
1690 }