iptables.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   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         { .name = "append", .has_arg = 1, .val = 'A' },
  26         { NULL }
  27 };
  28
  29 static struct xtables_globals xtg = {
  30         .option_offset = 0,
  31         .program_version = "4",
  32         .orig_opts = base_opts,
  33 };
  34
  35 static struct xtables_globals xtg6 = {
  36         .option_offset = 0,
  37         .program_version = "6",
  38         .orig_opts = base_opts,
  39 };
  40
  41 /* Required by certain extensions like SNAT and DNAT */
  42 int kernel_version = 0;
  43
  44 void
  45 get_kernel_version(void)
  46 {
  47         static struct utsname uts;
  48         int x = 0, y = 0, z = 0;
  49
  50         if (uname(&uts) == -1)
  51                 sprintf(uts.release, "3.0.0");
  52
  53         sscanf(uts.release, "%d.%d.%d", &x, &y, &z);
  54         kernel_version = 0x10000 * x + 0x100 * y + z;
  55 }
  56
  57 #ifdef DISABLE_IPV6
  58 #undef __ipt_module
  59 #define __ipt_module(x) libxt_##x##_init, libipt_##x##_init,
  60 #else
  61 #undef __ipt_module
  62 #define __ipt_module(x) libxt_##x##_init, libipt_##x##_init, libip6t_##x##_init,
  63 #endif
  64
  65 static void fw3_init_extensions(void)
  66 {
  67         int i;
  68         void (*initfuncs[])(void) = { FW3_IPT_MODULES };
  69
  70         for (i = 0; i < sizeof(initfuncs)/sizeof(initfuncs[0]); i++)
  71                 if (initfuncs[i])
  72                         initfuncs[i]();
  73 }
  74
  75 struct fw3_ipt_handle *
  76 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
  77 {
  78         struct fw3_ipt_handle *h;
  79
  80         h = fw3_alloc(sizeof(*h));
  81
  82         xtables_init();
  83
  84         if (family == FW3_FAMILY_V6)
  85         {
  86 #ifndef DISABLE_IPV6
  87                 h->family = FW3_FAMILY_V6;
  88                 h->table  = table;
  89                 h->handle = ip6tc_init(fw3_flag_names[table]);
  90
  91                 xtables_set_params(&xtg6);
  92                 xtables_set_nfproto(NFPROTO_IPV6);
  93 #endif
  94         }
  95         else
  96         {
  97                 h->family = FW3_FAMILY_V4;
  98                 h->table  = table;
  99                 h->handle = iptc_init(fw3_flag_names[table]);
 100
 101                 xtables_set_params(&xtg);
 102                 xtables_set_nfproto(NFPROTO_IPV4);
 103         }
 104
 105         if (!h->handle)
 106         {
 107                 free(h);
 108                 return NULL;
 109         }
 110
 111         fw3_xt_reset();
 112         fw3_init_extensions();
 113
 114         return h;
 115 }
 116
 117 static void
 118 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
 119 {
 120         va_list ap;
 121
 122         printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
 123                             fw3_flag_names[h->table]);
 124
 125         va_start(ap, fmt);
 126         vprintf(fmt, ap);
 127         va_end(ap);
 128 }
 129
 130 void
 131 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
 132                    enum fw3_flag policy)
 133 {
 134         if (fw3_pr_debug)
 135                 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
 136
 137 #ifndef DISABLE_IPV6
 138         if (h->family == FW3_FAMILY_V6)
 139                 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 140         else
 141 #endif
 142                 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 143 }
 144
 145 void
 146 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
 147 {
 148         if (fw3_pr_debug)
 149         {
 150                 debug(h, "-F %s\n", chain);
 151                 debug(h, "-X %s\n", chain);
 152         }
 153
 154 #ifndef DISABLE_IPV6
 155         if (h->family == FW3_FAMILY_V6)
 156         {
 157                 if (ip6tc_flush_entries(chain, h->handle))
 158                         ip6tc_delete_chain(chain, h->handle);
 159         }
 160         else
 161 #endif
 162         {
 163                 if (iptc_flush_entries(chain, h->handle))
 164                         iptc_delete_chain(chain, h->handle);
 165         }
 166 }
 167
 168 void
 169 fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 170 {
 171         unsigned int num;
 172         const struct ipt_entry *e;
 173         const char *chain;
 174         const char *t;
 175         bool found;
 176
 177 #ifndef DISABLE_IPV6
 178         if (h->family == FW3_FAMILY_V6)
 179         {
 180                 for (chain = ip6tc_first_chain(h->handle);
 181                      chain != NULL;
 182                      chain = ip6tc_next_chain(h->handle))
 183                 {
 184                         do {
 185                                 found = false;
 186
 187                                 const struct ip6t_entry *e6;
 188                                 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
 189                                          e6 != NULL;
 190                                          num++, e6 = ip6tc_next_rule(e6, h->handle))
 191                                 {
 192                                         t = ip6tc_get_target(e6, h->handle);
 193
 194                                         if (*t && !strcmp(t, target))
 195                                         {
 196                                                 if (fw3_pr_debug)
 197                                                         debug(h, "-D %s %u\n", chain, num + 1);
 198
 199                                                 ip6tc_delete_num_entry(chain, num, h->handle);
 200                                                 found = true;
 201                                                 break;
 202                                         }
 203                                 }
 204                         } while (found);
 205                 }
 206         }
 207         else
 208 #endif
 209         {
 210                 for (chain = iptc_first_chain(h->handle);
 211                      chain != NULL;
 212                      chain = iptc_next_chain(h->handle))
 213                 {
 214                         do {
 215                                 found = false;
 216
 217                                 for (num = 0, e = iptc_first_rule(chain, h->handle);
 218                                      e != NULL;
 219                                          num++, e = iptc_next_rule(e, h->handle))
 220                                 {
 221                                         t = iptc_get_target(e, h->handle);
 222
 223                                         if (*t && !strcmp(t, target))
 224                                         {
 225                                                 if (fw3_pr_debug)
 226                                                         debug(h, "-D %s %u\n", chain, num + 1);
 227
 228                                                 iptc_delete_num_entry(chain, num, h->handle);
 229                                                 found = true;
 230                                                 break;
 231                                         }
 232                                 }
 233                         } while (found);
 234                 }
 235         }
 236 }
 237
 238 void
 239 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
 240 {
 241         char buf[32];
 242         va_list ap;
 243
 244         va_start(ap, fmt);
 245         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 246         va_end(ap);
 247
 248         if (fw3_pr_debug)
 249                 debug(h, "-N %s\n", buf);
 250
 251         iptc_create_chain(buf, h->handle);
 252 }
 253
 254 void
 255 fw3_ipt_flush(struct fw3_ipt_handle *h)
 256 {
 257         const char *chain;
 258
 259 #ifndef DISABLE_IPV6
 260         if (h->family == FW3_FAMILY_V6)
 261         {
 262                 for (chain = ip6tc_first_chain(h->handle);
 263                      chain != NULL;
 264                      chain = ip6tc_next_chain(h->handle))
 265                 {
 266                         ip6tc_flush_entries(chain, h->handle);
 267                 }
 268
 269                 for (chain = ip6tc_first_chain(h->handle);
 270                      chain != NULL;
 271                      chain = ip6tc_next_chain(h->handle))
 272                 {
 273                         ip6tc_delete_chain(chain, h->handle);
 274                 }
 275         }
 276         else
 277 #endif
 278         {
 279                 for (chain = iptc_first_chain(h->handle);
 280                      chain != NULL;
 281                      chain = iptc_next_chain(h->handle))
 282                 {
 283                         iptc_flush_entries(chain, h->handle);
 284                 }
 285
 286                 for (chain = iptc_first_chain(h->handle);
 287                      chain != NULL;
 288                      chain = iptc_next_chain(h->handle))
 289                 {
 290                         iptc_delete_chain(chain, h->handle);
 291                 }
 292         }
 293 }
 294
 295 void
 296 fw3_ipt_commit(struct fw3_ipt_handle *h)
 297 {
 298         int rv;
 299
 300 #ifndef DISABLE_IPV6
 301         if (h->family == FW3_FAMILY_V6)
 302         {
 303                 rv = ip6tc_commit(h->handle);
 304                 if (!rv)
 305                         fprintf(stderr, "ip6tc_commit(): %s\n", ip6tc_strerror(errno));
 306         }
 307         else
 308 #endif
 309         {
 310                 rv = iptc_commit(h->handle);
 311                 if (!rv)
 312                         fprintf(stderr, "iptc_commit(): %s\n", iptc_strerror(errno));
 313         }
 314
 315         if (h->libv)
 316         {
 317                 while (h->libc > 0)
 318                 {
 319                         h->libc--;
 320                         dlclose(h->libv[h->libc]);
 321                 }
 322
 323                 free(h->libv);
 324         }
 325
 326         free(h);
 327 }
 328
 329 struct fw3_ipt_rule *
 330 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
 331 {
 332         struct fw3_ipt_rule *r;
 333
 334         r = fw3_alloc(sizeof(*r));
 335
 336         r->h = h;
 337         r->argv = fw3_alloc(sizeof(char *));
 338         r->argv[r->argc++] = "fw3";
 339
 340         return r;
 341 }
 342
 343
 344 static bool
 345 is_chain(struct fw3_ipt_handle *h, const char *name)
 346 {
 347 #ifndef DISABLE_IPV6
 348         if (h->family == FW3_FAMILY_V6)
 349                 return ip6tc_is_chain(name, h->handle);
 350         else
 351 #endif
 352                 return iptc_is_chain(name, h->handle);
 353 }
 354
 355 static char *
 356 get_protoname(struct fw3_ipt_rule *r)
 357 {
 358         const struct xtables_pprot *pp;
 359
 360         if (r->protocol)
 361                 for (pp = xtables_chain_protos; pp->name; pp++)
 362                         if (pp->num == r->protocol)
 363                                 return (char *)pp->name;
 364
 365         return NULL;
 366 }
 367
 368 static bool
 369 load_extension(struct fw3_ipt_handle *h, const char *name)
 370 {
 371         char path[256];
 372         void *lib, **tmp;
 373         const char *pfx = (h->family == FW3_FAMILY_V6) ? "libip6t" : "libipt";
 374
 375         snprintf(path, sizeof(path), "/usr/lib/iptables/libxt_%s.so", name);
 376         if (!(lib = dlopen(path, RTLD_NOW)))
 377         {
 378                 snprintf(path, sizeof(path), "/usr/lib/iptables/%s_%s.so", pfx, name);
 379                 lib = dlopen(path, RTLD_NOW);
 380         }
 381
 382         if (!lib)
 383                 return false;
 384
 385         tmp = realloc(h->libv, sizeof(lib) * (h->libc + 1));
 386
 387         if (!tmp)
 388                 return false;
 389
 390         h->libv = tmp;
 391         h->libv[h->libc++] = lib;
 392
 393         return true;
 394 }
 395
 396 static struct xtables_match *
 397 find_match(struct fw3_ipt_rule *r, const char *name)
 398 {
 399         struct xtables_match *m;
 400
 401         m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
 402
 403         if (!m && load_extension(r->h, name))
 404                 m = xtables_find_match(name, XTF_DONT_LOAD, &r->matches);
 405
 406         return m;
 407 }
 408
 409 static void
 410 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
 411 {
 412         size_t s;
 413         struct xtables_globals *g;
 414
 415         if (!m)
 416                 return;
 417
 418         s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
 419
 420         m->m = fw3_alloc(s);
 421
 422         fw3_xt_set_match_name(m);
 423
 424         m->m->u.user.revision = m->revision;
 425         m->m->u.match_size = s;
 426
 427         /* free previous userspace data */
 428         fw3_xt_free_match_udata(m);
 429
 430         if (m->init)
 431                 m->init(m->m);
 432
 433         /* don't merge options if no_clone is set and this match is a clone */
 434         if (no_clone && (m == m->next))
 435                 return;
 436
 437         /* merge option table */
 438         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 439         fw3_xt_merge_match_options(g, m);
 440 }
 441
 442 static bool
 443 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
 444 {
 445         if (!pname)
 446                 return false;
 447
 448         if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
 449                 return true;
 450
 451         return !r->protocol_loaded;
 452 }
 453
 454 static struct xtables_match *
 455 load_protomatch(struct fw3_ipt_rule *r)
 456 {
 457         const char *pname = get_protoname(r);
 458
 459         if (!need_protomatch(r, pname))
 460                 return NULL;
 461
 462         return find_match(r, pname);
 463 }
 464
 465 static struct xtables_target *
 466 find_target(struct fw3_ipt_rule *r, const char *name)
 467 {
 468         struct xtables_target *t;
 469
 470         if (is_chain(r->h, name))
 471                 return xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
 472
 473         t = xtables_find_target(name, XTF_DONT_LOAD);
 474
 475         if (!t && load_extension(r->h, name))
 476                 t = xtables_find_target(name, XTF_DONT_LOAD);
 477
 478         return t;
 479 }
 480
 481 static struct xtables_target *
 482 get_target(struct fw3_ipt_rule *r, const char *name)
 483 {
 484         size_t s;
 485         struct xtables_target *t;
 486         struct xtables_globals *g;
 487
 488         t = find_target(r, name);
 489
 490         if (!t)
 491                 return NULL;
 492
 493         s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
 494         t->t = fw3_alloc(s);
 495
 496         fw3_xt_set_target_name(t, name);
 497
 498         t->t->u.user.revision = t->revision;
 499         t->t->u.target_size = s;
 500
 501         /* free previous userspace data */
 502         fw3_xt_free_target_udata(t);
 503
 504         if (t->init)
 505                 t->init(t->t);
 506
 507         /* merge option table */
 508         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 509         fw3_xt_merge_target_options(g, t);
 510
 511         r->target = t;
 512
 513         return t;
 514 }
 515
 516 void
 517 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
 518 {
 519         uint32_t pr;
 520
 521         if (!proto || proto->any)
 522                 return;
 523
 524         pr = proto->protocol;
 525
 526 #ifndef DISABLE_IPV6
 527         if (r->h->family == FW3_FAMILY_V6)
 528         {
 529                 if (pr == 1)
 530                         pr = 58;
 531
 532                 r->e6.ipv6.proto = pr;
 533                 r->e6.ipv6.flags |= IP6T_F_PROTO;
 534
 535                 if (proto->invert)
 536                         r->e6.ipv6.invflags |= XT_INV_PROTO;
 537         }
 538         else
 539 #endif
 540         {
 541                 r->e.ip.proto = pr;
 542
 543                 if (proto->invert)
 544                         r->e.ip.invflags |= XT_INV_PROTO;
 545         }
 546
 547         r->protocol = pr;
 548 }
 549
 550 void
 551 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 552                     struct fw3_device *in, struct fw3_device *out)
 553 {
 554 #ifndef DISABLE_IPV6
 555         if (r->h->family == FW3_FAMILY_V6)
 556         {
 557                 if (in && !in->any)
 558                 {
 559                         xtables_parse_interface(in->name, r->e6.ipv6.iniface,
 560                                                           r->e6.ipv6.iniface_mask);
 561
 562                         if (in->invert)
 563                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
 564                 }
 565
 566                 if (out && !out->any)
 567                 {
 568                         xtables_parse_interface(out->name, r->e6.ipv6.outiface,
 569                                                            r->e6.ipv6.outiface_mask);
 570
 571                         if (out->invert)
 572                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
 573                 }
 574         }
 575         else
 576 #endif
 577         {
 578                 if (in && !in->any)
 579                 {
 580                         xtables_parse_interface(in->name, r->e.ip.iniface,
 581                                                           r->e.ip.iniface_mask);
 582
 583                         if (in->invert)
 584                                 r->e.ip.invflags |= IPT_INV_VIA_IN;
 585                 }
 586
 587                 if (out && !out->any)
 588                 {
 589                         xtables_parse_interface(out->name, r->e.ip.outiface,
 590                                                            r->e.ip.outiface_mask);
 591
 592                         if (out->invert)
 593                                 r->e.ip.invflags |= IPT_INV_VIA_OUT;
 594                 }
 595         }
 596 }
 597
 598
 599 static void
 600 ip4prefix2mask(int prefix, struct in_addr *mask)
 601 {
 602         mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
 603 }
 604
 605 #ifndef DISABLE_IPV6
 606 static void
 607 ip6prefix2mask(int prefix, struct in6_addr *mask)
 608 {
 609         char *p = (char *)mask;
 610
 611         if (prefix > 0)
 612         {
 613                 memset(p, 0xff, prefix / 8);
 614                 memset(p + (prefix / 8) + 1, 0, (128 - prefix) / 8);
 615                 p[prefix / 8] = 0xff << (8 - (prefix & 7));
 616         }
 617         else
 618         {
 619                 memset(mask, 0, sizeof(*mask));
 620         }
 621 }
 622 #endif
 623
 624 void
 625 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 626                       struct fw3_address *src, struct fw3_address *dest)
 627 {
 628         if ((src && src->range) || (dest && dest->range))
 629         {
 630                 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
 631         }
 632
 633         if (src && src->set)
 634         {
 635                 if (src->range)
 636                 {
 637                         fw3_ipt_rule_addarg(r, src->invert, "--src-range",
 638                                             fw3_address_to_string(src, false));
 639                 }
 640 #ifndef DISABLE_IPV6
 641                 else if (r->h->family == FW3_FAMILY_V6)
 642                 {
 643                         r->e6.ipv6.src = src->address.v6;
 644                         ip6prefix2mask(src->mask, &r->e6.ipv6.smsk);
 645
 646                         int i;
 647                         for (i = 0; i < 4; i++)
 648                                 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
 649
 650                         if (src->invert)
 651                                 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
 652                 }
 653 #endif
 654                 else
 655                 {
 656                         r->e.ip.src = src->address.v4;
 657                         ip4prefix2mask(src->mask, &r->e.ip.smsk);
 658
 659                         r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
 660
 661                         if (src->invert)
 662                                 r->e.ip.invflags |= IPT_INV_SRCIP;
 663                 }
 664         }
 665
 666         if (dest && dest->set)
 667         {
 668                 if (dest->range)
 669                 {
 670                         fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
 671                                             fw3_address_to_string(dest, false));
 672                 }
 673 #ifndef DISABLE_IPV6
 674                 else if (r->h->family == FW3_FAMILY_V6)
 675                 {
 676                         r->e6.ipv6.dst = dest->address.v6;
 677                         ip6prefix2mask(dest->mask, &r->e6.ipv6.dmsk);
 678
 679                         int i;
 680                         for (i = 0; i < 4; i++)
 681                                 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
 682
 683                         if (dest->invert)
 684                                 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
 685                 }
 686 #endif
 687                 else
 688                 {
 689                         r->e.ip.dst = dest->address.v4;
 690                         ip4prefix2mask(dest->mask, &r->e.ip.dmsk);
 691
 692                         r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
 693
 694                         if (dest->invert)
 695                                 r->e.ip.invflags |= IPT_INV_DSTIP;
 696                 }
 697         }
 698 }
 699
 700 void
 701 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 702                          struct fw3_port *sp, struct fw3_port *dp)
 703 {
 704         char buf[sizeof("65535:65535\0")];
 705
 706         if ((!sp || !sp->set) && (!dp || !dp->set))
 707                 return;
 708
 709         if (!get_protoname(r))
 710                 return;
 711
 712         if (sp && sp->set)
 713         {
 714                 if (sp->port_min == sp->port_max)
 715                         sprintf(buf, "%u", sp->port_min);
 716                 else
 717                         sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
 718
 719                 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
 720         }
 721
 722         if (dp && dp->set)
 723         {
 724                 if (dp->port_min == dp->port_max)
 725                         sprintf(buf, "%u", dp->port_min);
 726                 else
 727                         sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
 728
 729                 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
 730         }
 731 }
 732
 733 void
 734 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
 735 {
 736         if (!mac)
 737                 return;
 738
 739         fw3_ipt_rule_addarg(r, false, "-m", "mac");
 740         fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", ether_ntoa(&mac->mac));
 741 }
 742
 743 void
 744 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
 745 {
 746         char buf[sizeof("255/255\0")];
 747
 748         if (!icmp)
 749                 return;
 750
 751 #ifndef DISABLE_IPV6
 752         if (r->h->family == FW3_FAMILY_V6)
 753         {
 754                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
 755                         sprintf(buf, "%u", icmp->type6);
 756                 else
 757                         sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
 758
 759                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
 760         }
 761         else
 762 #endif
 763         {
 764                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
 765                         sprintf(buf, "%u", icmp->type);
 766                 else
 767                         sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
 768
 769                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
 770         }
 771 }
 772
 773 void
 774 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
 775 {
 776         char buf[sizeof("-4294967296/second\0")];
 777
 778         if (!limit || limit->rate <= 0)
 779                 return;
 780
 781         fw3_ipt_rule_addarg(r, false, "-m", "limit");
 782
 783         sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
 784         fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
 785
 786         if (limit->burst > 0)
 787         {
 788                 sprintf(buf, "%u", limit->burst);
 789                 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
 790         }
 791 }
 792
 793 void
 794 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
 795                    bool invert)
 796 {
 797         char buf[sizeof("dst,dst,dst\0")];
 798         char *p = buf;
 799
 800         struct fw3_ipset_datatype *type;
 801
 802         if (!ipset)
 803                 return;
 804
 805         list_for_each_entry(type, &ipset->datatypes, list)
 806         {
 807                 if (p > buf)
 808                         *p++ = ',';
 809
 810                 p += sprintf(p, "%s", type->dest ? "dst" : "src");
 811         }
 812
 813         fw3_ipt_rule_addarg(r, false, "-m", "set");
 814
 815         fw3_ipt_rule_addarg(r, invert, "--match-set",
 816                             ipset->external ? ipset->external : ipset->name);
 817
 818         fw3_ipt_rule_addarg(r, false, buf, NULL);
 819 }
 820
 821 void
 822 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
 823 {
 824         int i;
 825         struct tm empty = { 0 };
 826
 827         char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
 828         char *p;
 829
 830         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
 831         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 832
 833         if (!d1 && !d2 && !time->timestart && !time->timestop &&
 834             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
 835         {
 836                 return;
 837         }
 838
 839         fw3_ipt_rule_addarg(r, false, "-m", "time");
 840
 841         if (time->utc)
 842                 fw3_ipt_rule_addarg(r, false, "--utc", NULL);
 843
 844         if (d1)
 845         {
 846                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
 847                 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
 848         }
 849
 850         if (d2)
 851         {
 852                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
 853                 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
 854         }
 855
 856         if (time->timestart)
 857         {
 858                 sprintf(buf, "%02d:%02d:%02d",
 859                         time->timestart / 3600,
 860                         time->timestart % 3600 / 60,
 861                         time->timestart % 60);
 862
 863                 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
 864         }
 865
 866         if (time->timestop)
 867         {
 868                 sprintf(buf, "%02d:%02d:%02d",
 869                         time->timestop / 3600,
 870                         time->timestop % 3600 / 60,
 871                         time->timestop % 60);
 872
 873                 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
 874         }
 875
 876         if (time->monthdays & 0xFFFFFFFE)
 877         {
 878                 for (i = 1, p = buf; i < 32; i++)
 879                 {
 880                         if (hasbit(time->monthdays, i))
 881                         {
 882                                 if (p > buf)
 883                                         *p++ = ',';
 884
 885                                 p += sprintf(p, "%u", i);
 886                         }
 887                 }
 888
 889                 fw3_ipt_rule_addarg(r, hasbit(time->monthdays, 0), "--monthdays", buf);
 890         }
 891
 892         if (time->weekdays & 0xFE)
 893         {
 894                 for (i = 1, p = buf; i < 8; i++)
 895                 {
 896                         if (hasbit(time->weekdays, i))
 897                         {
 898                                 if (p > buf)
 899                                         *p++ = ',';
 900
 901                                 p += sprintf(p, "%u", i);
 902                         }
 903                 }
 904
 905                 fw3_ipt_rule_addarg(r, hasbit(time->weekdays, 0), "--weekdays", buf);
 906         }
 907 }
 908
 909 void
 910 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
 911 {
 912         char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
 913
 914         if (!mark || !mark->set)
 915                 return;
 916
 917         if (mark->mask < 0xFFFFFFFF)
 918                 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
 919         else
 920                 sprintf(buf, "0x%x", mark->mark);
 921
 922         fw3_ipt_rule_addarg(r, false, "-m", "mark");
 923         fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
 924 }
 925
 926 void
 927 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
 928 {
 929         va_list ap;
 930         char buf[256];
 931
 932         if (!fmt || !*fmt)
 933                 return;
 934
 935         va_start(ap, fmt);
 936         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 937         va_end(ap);
 938
 939         fw3_ipt_rule_addarg(r, false, "-m", "comment");
 940         fw3_ipt_rule_addarg(r, false, "--comment", buf);
 941 }
 942
 943 void
 944 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
 945 {
 946         char *p, **tmp, *s;
 947
 948         if (!extra || !*extra)
 949                 return;
 950
 951         s = fw3_strdup(extra);
 952
 953         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 954         {
 955                 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
 956
 957                 if (!tmp)
 958                         break;
 959
 960                 r->argv = tmp;
 961                 r->argv[r->argc++] = fw3_strdup(p);
 962         }
 963
 964         free(s);
 965 }
 966
 967 #ifndef DISABLE_IPV6
 968 static void
 969 rule_print6(struct ip6t_entry *e)
 970 {
 971         char buf[INET6_ADDRSTRLEN];
 972         char *pname;
 973
 974         if (e->ipv6.flags & IP6T_F_PROTO)
 975         {
 976                 if (e->ipv6.flags & XT_INV_PROTO)
 977                         printf(" !");
 978
 979                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
 980
 981                 if (pname)
 982                         printf(" -p %s", pname);
 983                 else
 984                         printf(" -p %u", e->ipv6.proto);
 985         }
 986
 987         if (e->ipv6.iniface[0])
 988         {
 989                 if (e->ipv6.flags & IP6T_INV_VIA_IN)
 990                         printf(" !");
 991
 992                 printf(" -i %s", e->ipv6.iniface);
 993         }
 994
 995         if (e->ipv6.outiface[0])
 996         {
 997                 if (e->ipv6.flags & IP6T_INV_VIA_OUT)
 998                         printf(" !");
 999
1000                 printf(" -o %s", e->ipv6.outiface);
1001         }
1002
1003         if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
1004         {
1005                 if (e->ipv6.flags & IP6T_INV_SRCIP)
1006                         printf(" !");
1007
1008                 printf(" -s %s/%u", inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof(buf)),
1009                                     xtables_ip6mask_to_cidr(&e->ipv6.smsk));
1010         }
1011
1012         if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
1013         {
1014                 if (e->ipv6.flags & IP6T_INV_DSTIP)
1015                         printf(" !");
1016
1017                 printf(" -d %s/%u", inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof(buf)),
1018                                     xtables_ip6mask_to_cidr(&e->ipv6.dmsk));
1019         }
1020 }
1021 #endif
1022
1023 static void
1024 rule_print4(struct ipt_entry *e)
1025 {
1026         struct in_addr in_zero = { 0 };
1027         char buf[sizeof("255.255.255.255\0")];
1028         char *pname;
1029
1030         if (e->ip.proto)
1031         {
1032                 if (e->ip.flags & XT_INV_PROTO)
1033                         printf(" !");
1034
1035                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
1036
1037                 if (pname)
1038                         printf(" -p %s", pname);
1039                 else
1040                         printf(" -p %u", e->ip.proto);
1041         }
1042
1043         if (e->ip.iniface[0])
1044         {
1045                 if (e->ip.flags & IPT_INV_VIA_IN)
1046                         printf(" !");
1047
1048                 printf(" -i %s", e->ip.iniface);
1049         }
1050
1051         if (e->ip.outiface[0])
1052         {
1053                 if (e->ip.flags & IPT_INV_VIA_OUT)
1054                         printf(" !");
1055
1056                 printf(" -o %s", e->ip.outiface);
1057         }
1058
1059         if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1060         {
1061                 if (e->ip.flags & IPT_INV_SRCIP)
1062                         printf(" !");
1063
1064                 printf(" -s %s/%u", inet_ntop(AF_INET, &e->ip.src, buf, sizeof(buf)),
1065                                     xtables_ipmask_to_cidr(&e->ip.smsk));
1066         }
1067
1068         if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1069         {
1070                 if (e->ip.flags & IPT_INV_DSTIP)
1071                         printf(" !");
1072
1073                 printf(" -d %s/%u", inet_ntop(AF_INET, &e->ip.dst, buf, sizeof(buf)),
1074                                     xtables_ipmask_to_cidr(&e->ip.dmsk));
1075         }
1076 }
1077
1078 static void
1079 rule_print(struct fw3_ipt_rule *r, const char *chain)
1080 {
1081         struct xtables_rule_match *rm;
1082         struct xtables_match *m;
1083         struct xtables_target *t;
1084
1085         debug(r->h, "-A %s", chain);
1086
1087 #ifndef DISABLE_IPV6
1088         if (r->h->family == FW3_FAMILY_V6)
1089                 rule_print6(&r->e6);
1090         else
1091 #endif
1092                 rule_print4(&r->e);
1093
1094         for (rm = r->matches; rm; rm = rm->next)
1095         {
1096                 m = rm->match;
1097                 printf(" -m %s", fw3_xt_get_match_name(m));
1098
1099                 if (m->save)
1100                         m->save(&r->e.ip, m->m);
1101         }
1102
1103         if (r->target)
1104         {
1105                 t = r->target;
1106                 printf(" -j %s", fw3_xt_get_target_name(t));
1107
1108                 if (t->save)
1109                         t->save(&r->e.ip, t->t);
1110         }
1111
1112         printf("\n");
1113 }
1114
1115 static bool
1116 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1117 {
1118         struct xtables_rule_match *m;
1119         struct xtables_match *em;
1120
1121         /* is a target option */
1122         if (r->target && fw3_xt_has_target_parse(r->target) &&
1123                 optc >= r->target->option_offset &&
1124                 optc < (r->target->option_offset + 256))
1125         {
1126                 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1127                 return false;
1128         }
1129
1130         /* try to dispatch argument to one of the match parsers */
1131         for (m = r->matches; m; m = m->next)
1132         {
1133                 em = m->match;
1134
1135                 if (m->completed || !fw3_xt_has_match_parse(em))
1136                         continue;
1137
1138                 if (optc < em->option_offset ||
1139                         optc >= (em->option_offset + 256))
1140                         continue;
1141
1142                 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1143                 return false;
1144         }
1145
1146         /* unhandled option, might belong to a protocol match */
1147         if ((em = load_protomatch(r)) != NULL)
1148         {
1149                 init_match(r, em, false);
1150
1151                 r->protocol_loaded = true;
1152                 optind--;
1153
1154                 return true;
1155         }
1156
1157         if (optc == ':')
1158                 fprintf(stderr, "parse_option(): option '%s' needs argument\n",
1159                         r->argv[optind-1]);
1160
1161         if (optc == '?')
1162                 fprintf(stderr, "parse_option(): unknown option '%s'\n",
1163                         r->argv[optind-1]);
1164
1165         return false;
1166 }
1167
1168 void
1169 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1170                     const char *k, const char *v)
1171 {
1172         int n;
1173         char **tmp;
1174
1175         if (!k)
1176                 return;
1177
1178         n = inv + !!k + !!v;
1179         tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1180
1181         if (!tmp)
1182                 return;
1183
1184         r->argv = tmp;
1185
1186         if (inv)
1187                 r->argv[r->argc++] = fw3_strdup("!");
1188
1189         r->argv[r->argc++] = fw3_strdup(k);
1190
1191         if (v)
1192                 r->argv[r->argc++] = fw3_strdup(v);
1193 }
1194
1195 void
1196 fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...)
1197 {
1198         size_t s;
1199         struct xtables_rule_match *m;
1200         struct xtables_match *em;
1201         struct xtables_target *et;
1202         struct xtables_globals *g;
1203         struct ipt_entry *e;
1204
1205         int i, optc;
1206         bool inv = false;
1207         char buf[32];
1208         va_list ap;
1209
1210         va_start(ap, fmt);
1211         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1212         va_end(ap);
1213
1214         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1215         g->opts = g->orig_opts;
1216
1217         optind = 0;
1218         opterr = 0;
1219
1220         while ((optc = getopt_long(r->argc, r->argv, "m:j:", g->opts, NULL)) != -1)
1221         {
1222                 switch (optc)
1223                 {
1224                 case 'm':
1225                         em = find_match(r, optarg);
1226
1227                         if (!em)
1228                         {
1229                                 fprintf(stderr, "fw3_ipt_rule_append(): Can't find match '%s'\n", optarg);
1230                                 goto free;
1231                         }
1232
1233                         init_match(r, em, true);
1234                         break;
1235
1236                 case 'j':
1237                         et = get_target(r, optarg);
1238
1239                         if (!et)
1240                         {
1241                                 fprintf(stderr, "fw3_ipt_rule_append(): Can't find target '%s'\n", optarg);
1242                                 goto free;
1243                         }
1244
1245                         break;
1246
1247                 case 1:
1248                         if ((optarg[0] == '!') && (optarg[1] == '\0'))
1249                         {
1250                                 inv = true;
1251                                 continue;
1252                         }
1253
1254                         fprintf(stderr, "fw3_ipt_rule_append(): Bad argument '%s'\n", optarg);
1255                         return;
1256
1257                 default:
1258                         if (parse_option(r, optc, inv))
1259                                 continue;
1260                         break;
1261                 }
1262
1263                 inv = false;
1264         }
1265
1266         for (m = r->matches; m; m = m->next)
1267                 xtables_option_mfcall(m->match);
1268
1269         if (r->target)
1270                 xtables_option_tfcall(r->target);
1271
1272         if (fw3_pr_debug)
1273                 rule_print(r, buf);
1274
1275 #ifndef DISABLE_IPV6
1276         if (r->h->family == FW3_FAMILY_V6)
1277         {
1278                 struct ip6t_entry *e6;
1279
1280                 s = XT_ALIGN(sizeof(struct ip6t_entry));
1281
1282                 for (m = r->matches; m; m = m->next)
1283                         s += m->match->m->u.match_size;
1284
1285                 e6 = fw3_alloc(s + r->target->t->u.target_size);
1286
1287                 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1288
1289                 e6->target_offset = s;
1290                 e6->next_offset = s + r->target->t->u.target_size;
1291
1292                 s = 0;
1293
1294                 for (m = r->matches; m; m = m->next)
1295                 {
1296                         memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1297                         s += m->match->m->u.match_size;
1298                 }
1299
1300                 memcpy(e6->elems + s, r->target->t, r->target->t->u.target_size);
1301                 ip6tc_append_entry(buf, e6, r->h->handle);
1302                 free(e6);
1303         }
1304         else
1305 #endif
1306         {
1307                 s = XT_ALIGN(sizeof(struct ipt_entry));
1308
1309                 for (m = r->matches; m; m = m->next)
1310                         s += m->match->m->u.match_size;
1311
1312                 e = fw3_alloc(s + r->target->t->u.target_size);
1313
1314                 memcpy(e, &r->e, sizeof(struct ipt_entry));
1315
1316                 e->target_offset = s;
1317                 e->next_offset = s + r->target->t->u.target_size;
1318
1319                 s = 0;
1320
1321                 for (m = r->matches; m; m = m->next)
1322                 {
1323                         memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1324                         s += m->match->m->u.match_size;
1325                 }
1326
1327                 memcpy(e->elems + s, r->target->t, r->target->t->u.target_size);
1328
1329                 if (!iptc_append_entry(buf, e, r->h->handle))
1330                         fprintf(stderr, "iptc_append_entry(): %s\n", iptc_strerror(errno));
1331
1332                 free(e);
1333         }
1334
1335 free:
1336         for (i = 1; i < r->argc; i++)
1337                 free(r->argv[i]);
1338
1339         free(r->argv);
1340
1341         xtables_rule_matches_free(&r->matches);
1342
1343         if (r->target)
1344                 free(r->target->t);
1345
1346         free(r);
1347
1348         /* reset all targets and matches */
1349         for (em = xtables_matches; em; em = em->next)
1350                 em->mflags = 0;
1351
1352         for (et = xtables_targets; et; et = et->next)
1353         {
1354                 et->tflags = 0;
1355                 et->used = 0;
1356         }
1357
1358         xtables_free_opts(1);
1359 }
1360
1361 struct fw3_ipt_rule *
1362 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1363                     struct fw3_device *in, struct fw3_device *out,
1364                     struct fw3_address *src, struct fw3_address *dest)
1365 {
1366         struct fw3_ipt_rule *r;
1367
1368         r = fw3_ipt_rule_new(handle);
1369
1370         fw3_ipt_rule_proto(r, proto);
1371         fw3_ipt_rule_in_out(r, in, out);
1372         fw3_ipt_rule_src_dest(r, src, dest);
1373
1374         return r;
1375 }