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 bool
 539 load_extension(struct fw3_ipt_handle *h, const char *name)
 540 {
 541         char path[256];
 542         void *lib;
 543         const char *pfx = (h->family == FW3_FAMILY_V6) ? "libip6t" : "libipt";
 544
 545         xext.retain = true;
 546
 547         snprintf(path, sizeof(path), "/usr/lib/iptables/libxt_%s.so", name);
 548         if (!(lib = dlopen(path, RTLD_NOW)))
 549         {
 550                 snprintf(path, sizeof(path), "/usr/lib/iptables/%s_%s.so", pfx, name);
 551                 lib = dlopen(path, RTLD_NOW);
 552         }
 553
 554         xext.retain = false;
 555
 556         return !!lib;
 557 }
 558
 559 static struct xtables_match *
 560 find_match(struct fw3_ipt_rule *r, const char *name)
 561 {
 562         struct xtables_match *m;
 563
 564         m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
 565
 566         if (!m && load_extension(r->h, name))
 567                 m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
 568
 569         return m;
 570 }
 571
 572 static void
 573 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
 574 {
 575         size_t s;
 576         struct xtables_globals *g;
 577
 578         if (!m)
 579                 return;
 580
 581         s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
 582
 583         m->m = fw3_alloc(s);
 584
 585         fw3_xt_set_match_name(m);
 586
 587         m->m->u.user.revision = m->revision;
 588         m->m->u.match_size = s;
 589
 590         /* free previous userspace data */
 591         fw3_xt_free_match_udata(m);
 592
 593         if (m->init)
 594                 m->init(m->m);
 595
 596         /* don't merge options if no_clone is set and this match is a clone */
 597         if (no_clone && (m == m->next))
 598                 return;
 599
 600         /* merge option table */
 601         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 602         fw3_xt_merge_match_options(g, m);
 603 }
 604
 605 static bool
 606 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
 607 {
 608         if (!pname)
 609                 return false;
 610
 611         if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
 612                 return true;
 613
 614         return !r->protocol_loaded;
 615 }
 616
 617 static struct xtables_match *
 618 load_protomatch(struct fw3_ipt_rule *r)
 619 {
 620         const char *pname = get_protoname(r);
 621
 622         if (!need_protomatch(r, pname))
 623                 return NULL;
 624
 625         return find_match(r, pname);
 626 }
 627
 628 static struct xtables_target *
 629 find_target(struct fw3_ipt_rule *r, const char *name)
 630 {
 631         struct xtables_target *t;
 632
 633         if (is_chain(r->h, name)) {
 634                 t = xtables_find_target(XT_STANDARD_TARGET, XTF_DONT_LOAD);
 635
 636                 if (t)
 637                         return t;
 638
 639                 load_extension(r->h, "standard");
 640                 return xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
 641         }
 642
 643         t = xtables_find_target(name, XTF_DONT_LOAD);
 644
 645         if (!t && load_extension(r->h, name))
 646                 t = xtables_find_target(name, XTF_DONT_LOAD);
 647
 648         return t;
 649 }
 650
 651 static struct xtables_target *
 652 get_target(struct fw3_ipt_rule *r, const char *name)
 653 {
 654         size_t s;
 655         struct xtables_target *t;
 656         struct xtables_globals *g;
 657
 658         t = find_target(r, name);
 659
 660         if (!t)
 661                 return NULL;
 662
 663         s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
 664         t->t = fw3_alloc(s);
 665
 666         fw3_xt_set_target_name(t, name);
 667
 668         t->t->u.user.revision = t->revision;
 669         t->t->u.target_size = s;
 670
 671         /* free previous userspace data */
 672         fw3_xt_free_target_udata(t);
 673
 674         if (t->init)
 675                 t->init(t->t);
 676
 677         /* merge option table */
 678         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 679         fw3_xt_merge_target_options(g, t);
 680
 681         r->target = t;
 682
 683         return t;
 684 }
 685
 686 void
 687 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
 688 {
 689         uint32_t pr;
 690
 691         if (!proto || proto->any)
 692                 return;
 693
 694         pr = proto->protocol;
 695
 696 #ifndef DISABLE_IPV6
 697         if (r->h->family == FW3_FAMILY_V6)
 698         {
 699                 if (pr == 1)
 700                         pr = 58;
 701
 702                 r->e6.ipv6.proto = pr;
 703                 r->e6.ipv6.flags |= IP6T_F_PROTO;
 704
 705                 if (proto->invert)
 706                         r->e6.ipv6.invflags |= XT_INV_PROTO;
 707         }
 708         else
 709 #endif
 710         {
 711                 r->e.ip.proto = pr;
 712
 713                 if (proto->invert)
 714                         r->e.ip.invflags |= XT_INV_PROTO;
 715         }
 716
 717         r->protocol = pr;
 718 }
 719
 720 void
 721 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 722                     struct fw3_device *in, struct fw3_device *out)
 723 {
 724 #ifndef DISABLE_IPV6
 725         if (r->h->family == FW3_FAMILY_V6)
 726         {
 727                 if (in && !in->any)
 728                 {
 729                         xtables_parse_interface(in->name, r->e6.ipv6.iniface,
 730                                                           r->e6.ipv6.iniface_mask);
 731
 732                         if (in->invert)
 733                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
 734                 }
 735
 736                 if (out && !out->any)
 737                 {
 738                         xtables_parse_interface(out->name, r->e6.ipv6.outiface,
 739                                                            r->e6.ipv6.outiface_mask);
 740
 741                         if (out->invert)
 742                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
 743                 }
 744         }
 745         else
 746 #endif
 747         {
 748                 if (in && !in->any)
 749                 {
 750                         xtables_parse_interface(in->name, r->e.ip.iniface,
 751                                                           r->e.ip.iniface_mask);
 752
 753                         if (in->invert)
 754                                 r->e.ip.invflags |= IPT_INV_VIA_IN;
 755                 }
 756
 757                 if (out && !out->any)
 758                 {
 759                         xtables_parse_interface(out->name, r->e.ip.outiface,
 760                                                            r->e.ip.outiface_mask);
 761
 762                         if (out->invert)
 763                                 r->e.ip.invflags |= IPT_INV_VIA_OUT;
 764                 }
 765         }
 766 }
 767
 768
 769 void
 770 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 771                       struct fw3_address *src, struct fw3_address *dest)
 772 {
 773         if ((src && src->range) || (dest && dest->range))
 774         {
 775                 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
 776         }
 777
 778         if (src && src->set)
 779         {
 780                 if (src->range)
 781                 {
 782                         fw3_ipt_rule_addarg(r, src->invert, "--src-range",
 783                                             fw3_address_to_string(src, false, false));
 784                 }
 785 #ifndef DISABLE_IPV6
 786                 else if (r->h->family == FW3_FAMILY_V6)
 787                 {
 788                         r->e6.ipv6.src = src->address.v6;
 789                         r->e6.ipv6.smsk = src->mask.v6;
 790
 791                         int i;
 792                         for (i = 0; i < 4; i++)
 793                                 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
 794
 795                         if (src->invert)
 796                                 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
 797                 }
 798 #endif
 799                 else
 800                 {
 801                         r->e.ip.src = src->address.v4;
 802                         r->e.ip.smsk = src->mask.v4;
 803
 804                         r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
 805
 806                         if (src->invert)
 807                                 r->e.ip.invflags |= IPT_INV_SRCIP;
 808                 }
 809         }
 810
 811         if (dest && dest->set)
 812         {
 813                 if (dest->range)
 814                 {
 815                         fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
 816                                             fw3_address_to_string(dest, false, false));
 817                 }
 818 #ifndef DISABLE_IPV6
 819                 else if (r->h->family == FW3_FAMILY_V6)
 820                 {
 821                         r->e6.ipv6.dst = dest->address.v6;
 822                         r->e6.ipv6.dmsk = dest->mask.v6;
 823
 824                         int i;
 825                         for (i = 0; i < 4; i++)
 826                                 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
 827
 828                         if (dest->invert)
 829                                 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
 830                 }
 831 #endif
 832                 else
 833                 {
 834                         r->e.ip.dst = dest->address.v4;
 835                         r->e.ip.dmsk = dest->mask.v4;
 836
 837                         r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
 838
 839                         if (dest->invert)
 840                                 r->e.ip.invflags |= IPT_INV_DSTIP;
 841                 }
 842         }
 843 }
 844
 845 void
 846 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 847                          struct fw3_port *sp, struct fw3_port *dp)
 848 {
 849         char buf[sizeof("65535:65535\0")];
 850
 851         if ((!sp || !sp->set) && (!dp || !dp->set))
 852                 return;
 853
 854         if (!get_protoname(r))
 855                 return;
 856
 857         if (sp && sp->set)
 858         {
 859                 if (sp->port_min == sp->port_max)
 860                         sprintf(buf, "%u", sp->port_min);
 861                 else
 862                         sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
 863
 864                 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
 865         }
 866
 867         if (dp && dp->set)
 868         {
 869                 if (dp->port_min == dp->port_max)
 870                         sprintf(buf, "%u", dp->port_min);
 871                 else
 872                         sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
 873
 874                 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
 875         }
 876 }
 877
 878 void
 879 fw3_ipt_rule_device(struct fw3_ipt_rule *r, const char *device, bool out)
 880 {
 881         if (device) {
 882                 struct fw3_device dev = { .any = false };
 883                 strncpy(dev.name, device, sizeof(dev.name) - 1);
 884                 fw3_ipt_rule_in_out(r, (out) ? NULL : &dev, (out) ? &dev : NULL);
 885         }
 886 }
 887
 888 void
 889 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
 890 {
 891         char buf[sizeof("ff:ff:ff:ff:ff:ff\0")];
 892         uint8_t *addr = mac->mac.ether_addr_octet;
 893
 894         if (!mac)
 895                 return;
 896
 897         sprintf(buf, "%02x:%02x:%02x:%02x:%02x:%02x",
 898                 addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 899
 900         fw3_ipt_rule_addarg(r, false, "-m", "mac");
 901         fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", buf);
 902 }
 903
 904 void
 905 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
 906 {
 907         char buf[sizeof("255/255\0")];
 908
 909         if (!icmp)
 910                 return;
 911
 912 #ifndef DISABLE_IPV6
 913         if (r->h->family == FW3_FAMILY_V6)
 914         {
 915                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
 916                         sprintf(buf, "%u", icmp->type6);
 917                 else
 918                         sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
 919
 920                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
 921         }
 922         else
 923 #endif
 924         {
 925                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
 926                         sprintf(buf, "%u", icmp->type);
 927                 else
 928                         sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
 929
 930                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
 931         }
 932 }
 933
 934 void
 935 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
 936 {
 937         char buf[sizeof("-4294967296/second\0")];
 938
 939         if (!limit || limit->rate <= 0)
 940                 return;
 941
 942         fw3_ipt_rule_addarg(r, false, "-m", "limit");
 943
 944         sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
 945         fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
 946
 947         if (limit->burst > 0)
 948         {
 949                 sprintf(buf, "%u", limit->burst);
 950                 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
 951         }
 952 }
 953
 954 void
 955 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_setmatch *match)
 956 {
 957         char buf[sizeof("dst,dst,dst\0")];
 958         char *p = buf;
 959         int i = 0;
 960
 961         struct fw3_ipset *set;
 962         struct fw3_ipset_datatype *type;
 963
 964         if (!match || !match->set || !match->ptr)
 965                 return;
 966
 967         set = match->ptr;
 968         list_for_each_entry(type, &set->datatypes, list)
 969         {
 970                 if (i >= 3)
 971                         break;
 972
 973                 if (p > buf)
 974                         *p++ = ',';
 975
 976                 p += sprintf(p, "%s", match->dir[i] ? match->dir[i] : type->dir);
 977                 i++;
 978         }
 979
 980         fw3_ipt_rule_addarg(r, false, "-m", "set");
 981
 982         fw3_ipt_rule_addarg(r, match->invert, "--match-set",
 983                             set->external ? set->external : set->name);
 984
 985         fw3_ipt_rule_addarg(r, false, buf, NULL);
 986 }
 987
 988 void
 989 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
 990 {
 991         int i;
 992         struct tm empty = { 0 };
 993
 994         char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
 995         char *p;
 996
 997         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
 998         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 999
1000         if (!d1 && !d2 && !time->timestart && !time->timestop &&
1001             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
1002         {
1003                 return;
1004         }
1005
1006         fw3_ipt_rule_addarg(r, false, "-m", "time");
1007
1008         if (time->utc)
1009                 fw3_ipt_rule_addarg(r, false, "--utc", NULL);
1010
1011         if (d1)
1012         {
1013                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
1014                 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
1015         }
1016
1017         if (d2)
1018         {
1019                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
1020                 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
1021         }
1022
1023         if (time->timestart)
1024         {
1025                 sprintf(buf, "%02d:%02d:%02d",
1026                         time->timestart / 3600,
1027                         time->timestart % 3600 / 60,
1028                         time->timestart % 60);
1029
1030                 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
1031         }
1032
1033         if (time->timestop)
1034         {
1035                 sprintf(buf, "%02d:%02d:%02d",
1036                         time->timestop / 3600,
1037                         time->timestop % 3600 / 60,
1038                         time->timestop % 60);
1039
1040                 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
1041         }
1042
1043         if (time->monthdays & 0xFFFFFFFE)
1044         {
1045                 for (i = 1, p = buf; i < 32; i++)
1046                 {
1047                         if (fw3_hasbit(time->monthdays, i))
1048                         {
1049                                 if (p > buf)
1050                                         *p++ = ',';
1051
1052                                 p += sprintf(p, "%u", i);
1053                         }
1054                 }
1055
1056                 fw3_ipt_rule_addarg(r, fw3_hasbit(time->monthdays, 0), "--monthdays", buf);
1057         }
1058
1059         if (time->weekdays & 0xFE)
1060         {
1061                 for (i = 1, p = buf; i < 8; i++)
1062                 {
1063                         if (fw3_hasbit(time->weekdays, i))
1064                         {
1065                                 if (p > buf)
1066                                         *p++ = ',';
1067
1068                                 p += sprintf(p, "%u", i);
1069                         }
1070                 }
1071
1072                 fw3_ipt_rule_addarg(r, fw3_hasbit(time->weekdays, 0), "--weekdays", buf);
1073         }
1074 }
1075
1076 void
1077 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
1078 {
1079         char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
1080
1081         if (!mark || !mark->set)
1082                 return;
1083
1084         if (mark->mask < 0xFFFFFFFF)
1085                 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
1086         else
1087                 sprintf(buf, "0x%x", mark->mark);
1088
1089         fw3_ipt_rule_addarg(r, false, "-m", "mark");
1090         fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
1091 }
1092
1093 void
1094 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
1095 {
1096         va_list ap;
1097         char buf[256];
1098
1099         if (!fmt || !*fmt)
1100                 return;
1101
1102         va_start(ap, fmt);
1103         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1104         va_end(ap);
1105
1106         fw3_ipt_rule_addarg(r, false, "-m", "comment");
1107         fw3_ipt_rule_addarg(r, false, "--comment", buf);
1108 }
1109
1110 void
1111 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
1112 {
1113         char *p, **tmp, *s;
1114
1115         if (!extra || !*extra)
1116                 return;
1117
1118         s = fw3_strdup(extra);
1119
1120         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
1121         {
1122                 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
1123
1124                 if (!tmp)
1125                         break;
1126
1127                 r->argv = tmp;
1128                 r->argv[r->argc++] = fw3_strdup(p);
1129         }
1130
1131         free(s);
1132 }
1133
1134 #ifndef DISABLE_IPV6
1135 static void
1136 rule_print6(struct ip6t_entry *e)
1137 {
1138         char buf1[INET6_ADDRSTRLEN], buf2[INET6_ADDRSTRLEN];
1139         char *pname;
1140
1141         if (e->ipv6.flags & IP6T_F_PROTO)
1142         {
1143                 if (e->ipv6.invflags & XT_INV_PROTO)
1144                         printf(" !");
1145
1146                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
1147
1148                 if (pname)
1149                         printf(" -p %s", pname);
1150                 else
1151                         printf(" -p %u", e->ipv6.proto);
1152         }
1153
1154         if (e->ipv6.iniface[0])
1155         {
1156                 if (e->ipv6.invflags & IP6T_INV_VIA_IN)
1157                         printf(" !");
1158
1159                 printf(" -i %s", e->ipv6.iniface);
1160         }
1161
1162         if (e->ipv6.outiface[0])
1163         {
1164                 if (e->ipv6.invflags & IP6T_INV_VIA_OUT)
1165                         printf(" !");
1166
1167                 printf(" -o %s", e->ipv6.outiface);
1168         }
1169
1170         if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1171         {
1172                 if (e->ipv6.invflags & IP6T_INV_SRCIP)
1173                         printf(" !");
1174
1175                 printf(" -s %s/%s",
1176                        inet_ntop(AF_INET6, &e->ipv6.src, buf1, sizeof(buf1)),
1177                        inet_ntop(AF_INET6, &e->ipv6.smsk, buf2, sizeof(buf2)));
1178         }
1179
1180         if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1181         {
1182                 if (e->ipv6.invflags & IP6T_INV_DSTIP)
1183                         printf(" !");
1184
1185                 printf(" -d %s/%s",
1186                        inet_ntop(AF_INET6, &e->ipv6.dst, buf1, sizeof(buf1)),
1187                        inet_ntop(AF_INET6, &e->ipv6.dmsk, buf2, sizeof(buf2)));
1188         }
1189 }
1190 #endif
1191
1192 static void
1193 rule_print4(struct ipt_entry *e)
1194 {
1195         struct in_addr in_zero = { 0 };
1196         char buf1[sizeof("255.255.255.255\0")], buf2[sizeof("255.255.255.255\0")];
1197         char *pname;
1198
1199         if (e->ip.proto)
1200         {
1201                 if (e->ip.invflags & XT_INV_PROTO)
1202                         printf(" !");
1203
1204                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1205
1206                 if (pname)
1207                         printf(" -p %s", pname);
1208                 else
1209                         printf(" -p %u", e->ip.proto);
1210         }
1211
1212         if (e->ip.iniface[0])
1213         {
1214                 if (e->ip.invflags & IPT_INV_VIA_IN)
1215                         printf(" !");
1216
1217                 printf(" -i %s", e->ip.iniface);
1218         }
1219
1220         if (e->ip.outiface[0])
1221         {
1222                 if (e->ip.invflags & IPT_INV_VIA_OUT)
1223                         printf(" !");
1224
1225                 printf(" -o %s", e->ip.outiface);
1226         }
1227
1228         if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1229         {
1230                 if (e->ip.invflags & IPT_INV_SRCIP)
1231                         printf(" !");
1232
1233                 printf(" -s %s/%s",
1234                        inet_ntop(AF_INET, &e->ip.src, buf1, sizeof(buf1)),
1235                        inet_ntop(AF_INET, &e->ip.smsk, buf2, sizeof(buf2)));
1236         }
1237
1238         if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1239         {
1240                 if (e->ip.invflags & IPT_INV_DSTIP)
1241                         printf(" !");
1242
1243                 printf(" -d %s/%s",
1244                        inet_ntop(AF_INET, &e->ip.dst, buf1, sizeof(buf1)),
1245                        inet_ntop(AF_INET, &e->ip.dmsk, buf2, sizeof(buf2)));
1246         }
1247 }
1248
1249 static void
1250 rule_print(struct fw3_ipt_rule *r, const char *prefix, const char *chain)
1251 {
1252         debug(r->h, "%s %s", prefix, chain);
1253
1254 #ifndef DISABLE_IPV6
1255         if (r->h->family == FW3_FAMILY_V6)
1256                 rule_print6(&r->e6);
1257         else
1258 #endif
1259                 rule_print4(&r->e);
1260
1261         fw3_xt_print_matches(&r->e.ip, r->matches);
1262         fw3_xt_print_target(&r->e.ip, r->target);
1263
1264         printf("\n");
1265 }
1266
1267 static bool
1268 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1269 {
1270         struct xtables_rule_match *m;
1271         struct xtables_match *em;
1272
1273         /* is a target option */
1274         if (r->target && fw3_xt_has_target_parse(r->target) &&
1275                 optc >= r->target->option_offset &&
1276                 optc < (r->target->option_offset + 256))
1277         {
1278                 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1279                 return false;
1280         }
1281
1282         /* try to dispatch argument to one of the match parsers */
1283         for (m = r->matches; m; m = m->next)
1284         {
1285                 em = m->match;
1286
1287                 if (m->completed || !fw3_xt_has_match_parse(em))
1288                         continue;
1289
1290                 if (optc < em->option_offset ||
1291                         optc >= (em->option_offset + 256))
1292                         continue;
1293
1294                 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1295                 return false;
1296         }
1297
1298         /* unhandled option, might belong to a protocol match */
1299         if ((em = load_protomatch(r)) != NULL)
1300         {
1301                 init_match(r, em, false);
1302
1303                 r->protocol_loaded = true;
1304                 optind--;
1305
1306                 return true;
1307         }
1308
1309         if (optc == ':')
1310                 warn("parse_option(): option '%s' needs argument", r->argv[optind-1]);
1311
1312         if (optc == '?')
1313                 warn("parse_option(): unknown option '%s'", r->argv[optind-1]);
1314
1315         return false;
1316 }
1317
1318 void
1319 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1320                     const char *k, const char *v)
1321 {
1322         int n;
1323         char **tmp;
1324
1325         if (!k)
1326                 return;
1327
1328         n = inv + !!k + !!v;
1329         tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1330
1331         if (!tmp)
1332                 return;
1333
1334         r->argv = tmp;
1335
1336         if (inv)
1337                 r->argv[r->argc++] = fw3_strdup("!");
1338
1339         r->argv[r->argc++] = fw3_strdup(k);
1340
1341         if (v)
1342                 r->argv[r->argc++] = fw3_strdup(v);
1343 }
1344
1345 static unsigned char *
1346 rule_mask(struct fw3_ipt_rule *r)
1347 {
1348         size_t s;
1349         unsigned char *p, *mask = NULL;
1350         struct xtables_rule_match *m;
1351
1352 #define SZ(x) XT_ALIGN(sizeof(struct x))
1353
1354 #ifndef DISABLE_IPV6
1355         if (r->h->family == FW3_FAMILY_V6)
1356         {
1357                 s = SZ(ip6t_entry);
1358
1359                 for (m = r->matches; m; m = m->next)
1360                         s += SZ(ip6t_entry_match) + m->match->size;
1361
1362                 s += SZ(ip6t_entry_target);
1363                 if (r->target)
1364                         s += r->target->size;
1365
1366                 mask = fw3_alloc(s);
1367                 memset(mask, 0xFF, SZ(ip6t_entry));
1368                 p = mask + SZ(ip6t_entry);
1369
1370                 for (m = r->matches; m; m = m->next)
1371                 {
1372                         memset(p, 0xFF, SZ(ip6t_entry_match) + m->match->userspacesize);
1373                         p += SZ(ip6t_entry_match) + m->match->size;
1374                 }
1375
1376                 memset(p, 0xFF, SZ(ip6t_entry_target) + (r->target) ? r->target->userspacesize : 0);
1377         }
1378         else
1379 #endif
1380         {
1381                 s = SZ(ipt_entry);
1382
1383                 for (m = r->matches; m; m = m->next)
1384                         s += SZ(ipt_entry_match) + m->match->size;
1385
1386                 s += SZ(ipt_entry_target);
1387                 if (r->target)
1388                         s += r->target->size;
1389
1390                 mask = fw3_alloc(s);
1391                 memset(mask, 0xFF, SZ(ipt_entry));
1392                 p = mask + SZ(ipt_entry);
1393
1394                 for (m = r->matches; m; m = m->next)
1395                 {
1396                         memset(p, 0xFF, SZ(ipt_entry_match) + m->match->userspacesize);
1397                         p += SZ(ipt_entry_match) + m->match->size;
1398                 }
1399
1400                 memset(p, 0xFF, SZ(ipt_entry_target) + (r->target) ? r->target->userspacesize : 0);
1401         }
1402
1403         return mask;
1404 }
1405
1406 static void *
1407 rule_build(struct fw3_ipt_rule *r)
1408 {
1409         size_t s, target_size = (r->target) ? r->target->t->u.target_size : 0;
1410         struct xtables_rule_match *m;
1411
1412 #ifndef DISABLE_IPV6
1413         if (r->h->family == FW3_FAMILY_V6)
1414         {
1415                 struct ip6t_entry *e6;
1416
1417                 s = XT_ALIGN(sizeof(struct ip6t_entry));
1418
1419                 for (m = r->matches; m; m = m->next)
1420                         s += m->match->m->u.match_size;
1421
1422                 e6 = fw3_alloc(s + target_size);
1423
1424                 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1425
1426                 e6->target_offset = s;
1427                 e6->next_offset = s + target_size;
1428
1429                 s = 0;
1430
1431                 for (m = r->matches; m; m = m->next)
1432                 {
1433                         memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1434                         s += m->match->m->u.match_size;
1435                 }
1436
1437                 if (target_size)
1438                         memcpy(e6->elems + s, r->target->t, target_size);
1439
1440                 return e6;
1441         }
1442         else
1443 #endif
1444         {
1445                 struct ipt_entry *e;
1446
1447                 s = XT_ALIGN(sizeof(struct ipt_entry));
1448
1449                 for (m = r->matches; m; m = m->next)
1450                         s += m->match->m->u.match_size;
1451
1452                 e = fw3_alloc(s + target_size);
1453
1454                 memcpy(e, &r->e, sizeof(struct ipt_entry));
1455
1456                 e->target_offset = s;
1457                 e->next_offset = s + target_size;
1458
1459                 s = 0;
1460
1461                 for (m = r->matches; m; m = m->next)
1462                 {
1463                         memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1464                         s += m->match->m->u.match_size;
1465                 }
1466
1467                 if (target_size)
1468                         memcpy(e->elems + s, r->target->t, target_size);
1469
1470                 return e;
1471         }
1472 }
1473
1474 void
1475 __fw3_ipt_rule_append(struct fw3_ipt_rule *r, bool repl, const char *fmt, ...)
1476 {
1477         void *rule;
1478         unsigned char *mask;
1479
1480         struct xtables_rule_match *m;
1481         struct xtables_match *em;
1482         struct xtables_target *et;
1483         struct xtables_globals *g;
1484
1485         int i, optc;
1486         uint32_t id;
1487         bool inv = false;
1488         char buf[32];
1489         va_list ap;
1490
1491         va_start(ap, fmt);
1492         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1493         va_end(ap);
1494
1495         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1496         g->opts = g->orig_opts;
1497
1498         optind = 0;
1499         opterr = 0;
1500
1501         if (r->id >= 0)
1502         {
1503                 em = find_match(r, "id");
1504
1505                 if (!em)
1506                 {
1507                         warn("fw3_ipt_rule_append(): Can't find match '%s'", "id");
1508                         goto free;
1509                 }
1510
1511                 init_match(r, em, true);
1512
1513                 id = FW3_ID_MAGIC | (r->id & ~FW3_ID_MASK);
1514                 memcpy(em->m->data, &id, sizeof(id));
1515
1516                 em->mflags = 1;
1517         }
1518
1519         while ((optc = getopt_long(r->argc, r->argv, "-:m:j:", g->opts,
1520                                    NULL)) != -1)
1521         {
1522                 switch (optc)
1523                 {
1524                 case 'm':
1525                         em = find_match(r, optarg);
1526
1527                         if (!em)
1528                         {
1529                                 warn("fw3_ipt_rule_append(): Can't find match '%s'", optarg);
1530                                 goto free;
1531                         }
1532
1533                         init_match(r, em, true);
1534                         break;
1535
1536                 case 'j':
1537                         et = get_target(r, optarg);
1538
1539                         if (!et)
1540                         {
1541                                 warn("fw3_ipt_rule_append(): Can't find target '%s'", optarg);
1542                                 goto free;
1543                         }
1544
1545                         break;
1546
1547                 case 1:
1548                         if ((optarg[0] == '!') && (optarg[1] == '\0'))
1549                         {
1550                                 optarg[0] = '\0';
1551                                 inv = true;
1552                                 continue;
1553                         }
1554
1555                         warn("fw3_ipt_rule_append(): Bad argument '%s'", optarg);
1556                         goto free;
1557
1558                 default:
1559                         if (parse_option(r, optc, inv))
1560                                 continue;
1561                         break;
1562                 }
1563
1564                 inv = false;
1565         }
1566
1567         for (m = r->matches; m; m = m->next)
1568                 xtables_option_mfcall(m->match);
1569
1570         if (r->target)
1571                 xtables_option_tfcall(r->target);
1572
1573         rule = rule_build(r);
1574
1575 #ifndef DISABLE_IPV6
1576         if (r->h->family == FW3_FAMILY_V6)
1577         {
1578                 if (repl)
1579                 {
1580                         mask = rule_mask(r);
1581
1582                         while (ip6tc_delete_entry(buf, rule, mask, r->h->handle))
1583                                 if (fw3_pr_debug)
1584                                         rule_print(r, "-D", buf);
1585
1586                         free(mask);
1587                 }
1588
1589                 if (fw3_pr_debug)
1590                         rule_print(r, "-A", buf);
1591
1592                 if (!ip6tc_append_entry(buf, rule, r->h->handle))
1593                         warn("ip6tc_append_entry(): %s", ip6tc_strerror(errno));
1594         }
1595         else
1596 #endif
1597         {
1598                 if (repl)
1599                 {
1600                         mask = rule_mask(r);
1601
1602                         while (iptc_delete_entry(buf, rule, mask, r->h->handle))
1603                                 if (fw3_pr_debug)
1604                                         rule_print(r, "-D", buf);
1605
1606                         free(mask);
1607                 }
1608
1609                 if (fw3_pr_debug)
1610                         rule_print(r, "-A", buf);
1611
1612                 if (!iptc_append_entry(buf, rule, r->h->handle))
1613                         warn("iptc_append_entry(): %s\n", iptc_strerror(errno));
1614         }
1615
1616         free(rule);
1617
1618 free:
1619         for (i = 1; i < r->argc; i++)
1620                 free(r->argv[i]);
1621
1622         free(r->argv);
1623
1624         xtables_rule_matches_free(&r->matches);
1625
1626         if (r->target)
1627                 free(r->target->t);
1628
1629         free(r);
1630
1631         /* reset all targets and matches */
1632         for (em = xtables_matches; em; em = em->next)
1633                 em->mflags = 0;
1634
1635         for (et = xtables_targets; et; et = et->next)
1636         {
1637                 et->tflags = 0;
1638                 et->used = 0;
1639         }
1640
1641         xtables_free_opts(1);
1642 }
1643
1644 struct fw3_ipt_rule *
1645 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1646                     struct fw3_device *in, struct fw3_device *out,
1647                     struct fw3_address *src, struct fw3_address *dest)
1648 {
1649         struct fw3_ipt_rule *r;
1650
1651         r = fw3_ipt_rule_new(handle);
1652
1653         fw3_ipt_rule_proto(r, proto);
1654         fw3_ipt_rule_in_out(r, in, out);
1655         fw3_ipt_rule_src_dest(r, src, dest);
1656
1657         return r;
1658 }
1659
1660 void
1661 xtables_register_match(struct xtables_match *me)
1662 {
1663         int i;
1664         static struct xtables_match **tmp;
1665
1666         if (!xext.register_match)
1667                 xext.register_match = dlsym(RTLD_NEXT, "xtables_register_match");
1668
1669         if (!xext.register_match)
1670                 return;
1671
1672         xext.register_match(me);
1673
1674         if (xext.retain)
1675         {
1676                 for (i = 0; i < xext.mcount; i++)
1677                         if (xext.matches[i] == me)
1678                                 return;
1679
1680                 tmp = realloc(xext.matches, sizeof(me) * (xext.mcount + 1));
1681
1682                 if (!tmp)
1683                         return;
1684
1685                 xext.matches = tmp;
1686                 xext.matches[xext.mcount++] = me;
1687         }
1688 }
1689
1690 void
1691 xtables_register_target(struct xtables_target *me)
1692 {
1693         int i;
1694         static struct xtables_target **tmp;
1695
1696         if (!xext.register_target)
1697                 xext.register_target = dlsym(RTLD_NEXT, "xtables_register_target");
1698
1699         if (!xext.register_target)
1700                 return;
1701
1702         xext.register_target(me);
1703
1704         if (xext.retain)
1705         {
1706                 for (i = 0; i < xext.tcount; i++)
1707                         if (xext.targets[i] == me)
1708                                 return;
1709
1710                 tmp = realloc(xext.targets, sizeof(me) * (xext.tcount + 1));
1711
1712                 if (!tmp)
1713                         return;
1714
1715                 xext.targets = tmp;
1716                 xext.targets[xext.tcount++] = me;
1717         }
1718 }