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         free(h);
 316 }
 317
 318 struct fw3_ipt_rule *
 319 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
 320 {
 321         struct fw3_ipt_rule *r;
 322
 323         r = fw3_alloc(sizeof(*r));
 324
 325         r->h = h;
 326         r->argv = fw3_alloc(sizeof(char *));
 327         r->argv[r->argc++] = "fw3";
 328
 329         return r;
 330 }
 331
 332
 333 static bool
 334 is_chain(struct fw3_ipt_handle *h, const char *name)
 335 {
 336 #ifndef DISABLE_IPV6
 337         if (h->family == FW3_FAMILY_V6)
 338                 return ip6tc_is_chain(name, h->handle);
 339         else
 340 #endif
 341                 return iptc_is_chain(name, h->handle);
 342 }
 343
 344 static char *
 345 get_protoname(struct fw3_ipt_rule *r)
 346 {
 347         const struct xtables_pprot *pp;
 348
 349         if (r->protocol)
 350                 for (pp = xtables_chain_protos; pp->name; pp++)
 351                         if (pp->num == r->protocol)
 352                                 return (char *)pp->name;
 353
 354         return NULL;
 355 }
 356
 357 static struct xtables_match *
 358 find_match(struct fw3_ipt_rule *r, const char *name)
 359 {
 360         return xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
 361 }
 362
 363 static void
 364 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
 365 {
 366         size_t s;
 367         struct xtables_globals *g;
 368
 369         if (!m)
 370                 return;
 371
 372         s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
 373
 374         m->m = fw3_alloc(s);
 375
 376         fw3_xt_set_match_name(m);
 377
 378         m->m->u.user.revision = m->revision;
 379         m->m->u.match_size = s;
 380
 381         /* free previous userspace data */
 382         fw3_xt_free_match_udata(m);
 383
 384         if (m->init)
 385                 m->init(m->m);
 386
 387         /* don't merge options if no_clone is set and this match is a clone */
 388         if (no_clone && (m == m->next))
 389                 return;
 390
 391         /* merge option table */
 392         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 393         fw3_xt_merge_match_options(g, m);
 394 }
 395
 396 static bool
 397 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
 398 {
 399         if (!pname)
 400                 return false;
 401
 402         if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
 403                 return true;
 404
 405         return !r->protocol_loaded;
 406 }
 407
 408 static struct xtables_match *
 409 load_protomatch(struct fw3_ipt_rule *r)
 410 {
 411         const char *pname = get_protoname(r);
 412
 413         if (!need_protomatch(r, pname))
 414                 return NULL;
 415
 416         return find_match(r, pname);
 417 }
 418
 419 static struct xtables_target *
 420 get_target(struct fw3_ipt_rule *r, const char *name)
 421 {
 422         size_t s;
 423         struct xtables_target *t;
 424         struct xtables_globals *g;
 425
 426         bool chain = is_chain(r->h, name);
 427
 428         if (chain)
 429                 t = xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
 430         else
 431                 t = xtables_find_target(name, XTF_TRY_LOAD);
 432
 433         if (!t)
 434                 return NULL;
 435
 436         s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
 437         t->t = fw3_alloc(s);
 438
 439         fw3_xt_set_target_name(t, name);
 440
 441         t->t->u.user.revision = t->revision;
 442         t->t->u.target_size = s;
 443
 444         /* free previous userspace data */
 445         fw3_xt_free_target_udata(t);
 446
 447         if (t->init)
 448                 t->init(t->t);
 449
 450         /* merge option table */
 451         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 452         fw3_xt_merge_target_options(g, t);
 453
 454         r->target = t;
 455
 456         return t;
 457 }
 458
 459 void
 460 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
 461 {
 462         uint32_t pr;
 463
 464         if (!proto || proto->any)
 465                 return;
 466
 467         pr = proto->protocol;
 468
 469 #ifndef DISABLE_IPV6
 470         if (r->h->family == FW3_FAMILY_V6)
 471         {
 472                 if (pr == 1)
 473                         pr = 58;
 474
 475                 r->e6.ipv6.proto = pr;
 476                 r->e6.ipv6.flags |= IP6T_F_PROTO;
 477
 478                 if (proto->invert)
 479                         r->e6.ipv6.invflags |= XT_INV_PROTO;
 480         }
 481         else
 482 #endif
 483         {
 484                 r->e.ip.proto = pr;
 485
 486                 if (proto->invert)
 487                         r->e.ip.invflags |= XT_INV_PROTO;
 488         }
 489
 490         r->protocol = pr;
 491 }
 492
 493 void
 494 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 495                     struct fw3_device *in, struct fw3_device *out)
 496 {
 497 #ifndef DISABLE_IPV6
 498         if (r->h->family == FW3_FAMILY_V6)
 499         {
 500                 if (in && !in->any)
 501                 {
 502                         xtables_parse_interface(in->name, r->e6.ipv6.iniface,
 503                                                           r->e6.ipv6.iniface_mask);
 504
 505                         if (in->invert)
 506                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
 507                 }
 508
 509                 if (out && !out->any)
 510                 {
 511                         xtables_parse_interface(out->name, r->e6.ipv6.outiface,
 512                                                            r->e6.ipv6.outiface_mask);
 513
 514                         if (out->invert)
 515                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
 516                 }
 517         }
 518         else
 519 #endif
 520         {
 521                 if (in && !in->any)
 522                 {
 523                         xtables_parse_interface(in->name, r->e.ip.iniface,
 524                                                           r->e.ip.iniface_mask);
 525
 526                         if (in->invert)
 527                                 r->e.ip.invflags |= IPT_INV_VIA_IN;
 528                 }
 529
 530                 if (out && !out->any)
 531                 {
 532                         xtables_parse_interface(out->name, r->e.ip.outiface,
 533                                                            r->e.ip.outiface_mask);
 534
 535                         if (out->invert)
 536                                 r->e.ip.invflags |= IPT_INV_VIA_OUT;
 537                 }
 538         }
 539 }
 540
 541
 542 static void
 543 ip4prefix2mask(int prefix, struct in_addr *mask)
 544 {
 545         mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
 546 }
 547
 548 #ifndef DISABLE_IPV6
 549 static void
 550 ip6prefix2mask(int prefix, struct in6_addr *mask)
 551 {
 552         char *p = (char *)mask;
 553
 554         if (prefix > 0)
 555         {
 556                 memset(p, 0xff, prefix / 8);
 557                 memset(p + (prefix / 8) + 1, 0, (128 - prefix) / 8);
 558                 p[prefix / 8] = 0xff << (8 - (prefix & 7));
 559         }
 560         else
 561         {
 562                 memset(mask, 0, sizeof(*mask));
 563         }
 564 }
 565 #endif
 566
 567 void
 568 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 569                       struct fw3_address *src, struct fw3_address *dest)
 570 {
 571         if ((src && src->range) || (dest && dest->range))
 572         {
 573                 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
 574         }
 575
 576         if (src && src->set)
 577         {
 578                 if (src->range)
 579                 {
 580                         fw3_ipt_rule_addarg(r, src->invert, "--src-range",
 581                                             fw3_address_to_string(src, false));
 582                 }
 583 #ifndef DISABLE_IPV6
 584                 else if (r->h->family == FW3_FAMILY_V6)
 585                 {
 586                         r->e6.ipv6.src = src->address.v6;
 587                         ip6prefix2mask(src->mask, &r->e6.ipv6.smsk);
 588
 589                         int i;
 590                         for (i = 0; i < 4; i++)
 591                                 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
 592
 593                         if (src->invert)
 594                                 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
 595                 }
 596 #endif
 597                 else
 598                 {
 599                         r->e.ip.src = src->address.v4;
 600                         ip4prefix2mask(src->mask, &r->e.ip.smsk);
 601
 602                         r->e.ip.src.s_addr &= r->e.ip.smsk.s_addr;
 603
 604                         if (src->invert)
 605                                 r->e.ip.invflags |= IPT_INV_SRCIP;
 606                 }
 607         }
 608
 609         if (dest && dest->set)
 610         {
 611                 if (dest->range)
 612                 {
 613                         fw3_ipt_rule_addarg(r, dest->invert, "--dst-range",
 614                                             fw3_address_to_string(dest, false));
 615                 }
 616 #ifndef DISABLE_IPV6
 617                 else if (r->h->family == FW3_FAMILY_V6)
 618                 {
 619                         r->e6.ipv6.dst = dest->address.v6;
 620                         ip6prefix2mask(dest->mask, &r->e6.ipv6.dmsk);
 621
 622                         int i;
 623                         for (i = 0; i < 4; i++)
 624                                 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
 625
 626                         if (dest->invert)
 627                                 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
 628                 }
 629 #endif
 630                 else
 631                 {
 632                         r->e.ip.dst = dest->address.v4;
 633                         ip4prefix2mask(dest->mask, &r->e.ip.dmsk);
 634
 635                         r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
 636
 637                         if (dest->invert)
 638                                 r->e.ip.invflags |= IPT_INV_DSTIP;
 639                 }
 640         }
 641 }
 642
 643 void
 644 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 645                          struct fw3_port *sp, struct fw3_port *dp)
 646 {
 647         char buf[sizeof("65535:65535\0")];
 648
 649         if ((!sp || !sp->set) && (!dp || !dp->set))
 650                 return;
 651
 652         if (!get_protoname(r))
 653                 return;
 654
 655         if (sp && sp->set)
 656         {
 657                 if (sp->port_min == sp->port_max)
 658                         sprintf(buf, "%u", sp->port_min);
 659                 else
 660                         sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
 661
 662                 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
 663         }
 664
 665         if (dp && dp->set)
 666         {
 667                 if (dp->port_min == dp->port_max)
 668                         sprintf(buf, "%u", dp->port_min);
 669                 else
 670                         sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
 671
 672                 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
 673         }
 674 }
 675
 676 void
 677 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
 678 {
 679         if (!mac)
 680                 return;
 681
 682         fw3_ipt_rule_addarg(r, false, "-m", "mac");
 683         fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", ether_ntoa(&mac->mac));
 684 }
 685
 686 void
 687 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
 688 {
 689         char buf[sizeof("255/255\0")];
 690
 691         if (!icmp)
 692                 return;
 693
 694 #ifndef DISABLE_IPV6
 695         if (r->h->family == FW3_FAMILY_V6)
 696         {
 697                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
 698                         sprintf(buf, "%u", icmp->type6);
 699                 else
 700                         sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
 701
 702                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
 703         }
 704         else
 705 #endif
 706         {
 707                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
 708                         sprintf(buf, "%u", icmp->type);
 709                 else
 710                         sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
 711
 712                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
 713         }
 714 }
 715
 716 void
 717 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
 718 {
 719         char buf[sizeof("-4294967296/second\0")];
 720
 721         if (!limit || limit->rate <= 0)
 722                 return;
 723
 724         fw3_ipt_rule_addarg(r, false, "-m", "limit");
 725
 726         sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
 727         fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
 728
 729         if (limit->burst > 0)
 730         {
 731                 sprintf(buf, "%u", limit->burst);
 732                 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
 733         }
 734 }
 735
 736 void
 737 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
 738                    bool invert)
 739 {
 740         char buf[sizeof("dst,dst,dst\0")];
 741         char *p = buf;
 742
 743         struct fw3_ipset_datatype *type;
 744
 745         if (!ipset)
 746                 return;
 747
 748         list_for_each_entry(type, &ipset->datatypes, list)
 749         {
 750                 if (p > buf)
 751                         *p++ = ',';
 752
 753                 p += sprintf(p, "%s", type->dest ? "dst" : "src");
 754         }
 755
 756         fw3_ipt_rule_addarg(r, false, "-m", "set");
 757
 758         fw3_ipt_rule_addarg(r, invert, "--match-set",
 759                             ipset->external ? ipset->external : ipset->name);
 760
 761         fw3_ipt_rule_addarg(r, false, buf, NULL);
 762 }
 763
 764 void
 765 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
 766 {
 767         int i;
 768         struct tm empty = { 0 };
 769
 770         char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
 771         char *p;
 772
 773         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
 774         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 775
 776         if (!d1 && !d2 && !time->timestart && !time->timestop &&
 777             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
 778         {
 779                 return;
 780         }
 781
 782         fw3_ipt_rule_addarg(r, false, "-m", "time");
 783
 784         if (time->utc)
 785                 fw3_ipt_rule_addarg(r, false, "--utc", NULL);
 786
 787         if (d1)
 788         {
 789                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
 790                 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
 791         }
 792
 793         if (d2)
 794         {
 795                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
 796                 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
 797         }
 798
 799         if (time->timestart)
 800         {
 801                 sprintf(buf, "%02d:%02d:%02d",
 802                         time->timestart / 3600,
 803                         time->timestart % 3600 / 60,
 804                         time->timestart % 60);
 805
 806                 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
 807         }
 808
 809         if (time->timestop)
 810         {
 811                 sprintf(buf, "%02d:%02d:%02d",
 812                         time->timestop / 3600,
 813                         time->timestop % 3600 / 60,
 814                         time->timestop % 60);
 815
 816                 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
 817         }
 818
 819         if (time->monthdays & 0xFFFFFFFE)
 820         {
 821                 for (i = 1, p = buf; i < 32; i++)
 822                 {
 823                         if (hasbit(time->monthdays, i))
 824                         {
 825                                 if (p > buf)
 826                                         *p++ = ',';
 827
 828                                 p += sprintf(p, "%u", i);
 829                         }
 830                 }
 831
 832                 fw3_ipt_rule_addarg(r, hasbit(time->monthdays, 0), "--monthdays", buf);
 833         }
 834
 835         if (time->weekdays & 0xFE)
 836         {
 837                 for (i = 1, p = buf; i < 8; i++)
 838                 {
 839                         if (hasbit(time->weekdays, i))
 840                         {
 841                                 if (p > buf)
 842                                         *p++ = ',';
 843
 844                                 p += sprintf(p, "%u", i);
 845                         }
 846                 }
 847
 848                 fw3_ipt_rule_addarg(r, hasbit(time->weekdays, 0), "--weekdays", buf);
 849         }
 850 }
 851
 852 void
 853 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
 854 {
 855         char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
 856
 857         if (!mark || !mark->set)
 858                 return;
 859
 860         if (mark->mask < 0xFFFFFFFF)
 861                 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
 862         else
 863                 sprintf(buf, "0x%x", mark->mark);
 864
 865         fw3_ipt_rule_addarg(r, false, "-m", "mark");
 866         fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
 867 }
 868
 869 void
 870 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
 871 {
 872         va_list ap;
 873         char buf[256];
 874
 875         if (!fmt || !*fmt)
 876                 return;
 877
 878         va_start(ap, fmt);
 879         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 880         va_end(ap);
 881
 882         fw3_ipt_rule_addarg(r, false, "-m", "comment");
 883         fw3_ipt_rule_addarg(r, false, "--comment", buf);
 884 }
 885
 886 void
 887 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
 888 {
 889         char *p, **tmp, *s;
 890
 891         if (!extra || !*extra)
 892                 return;
 893
 894         s = fw3_strdup(extra);
 895
 896         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 897         {
 898                 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
 899
 900                 if (!tmp)
 901                         break;
 902
 903                 r->argv = tmp;
 904                 r->argv[r->argc++] = fw3_strdup(p);
 905         }
 906
 907         free(s);
 908 }
 909
 910 #ifndef DISABLE_IPV6
 911 static void
 912 rule_print6(struct ip6t_entry *e)
 913 {
 914         char buf[INET6_ADDRSTRLEN];
 915         char *pname;
 916
 917         if (e->ipv6.flags & IP6T_F_PROTO)
 918         {
 919                 if (e->ipv6.flags & XT_INV_PROTO)
 920                         printf(" !");
 921
 922                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
 923
 924                 if (pname)
 925                         printf(" -p %s", pname);
 926                 else
 927                         printf(" -p %u", e->ipv6.proto);
 928         }
 929
 930         if (e->ipv6.iniface[0])
 931         {
 932                 if (e->ipv6.flags & IP6T_INV_VIA_IN)
 933                         printf(" !");
 934
 935                 printf(" -i %s", e->ipv6.iniface);
 936         }
 937
 938         if (e->ipv6.outiface[0])
 939         {
 940                 if (e->ipv6.flags & IP6T_INV_VIA_OUT)
 941                         printf(" !");
 942
 943                 printf(" -o %s", e->ipv6.outiface);
 944         }
 945
 946         if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
 947         {
 948                 if (e->ipv6.flags & IP6T_INV_SRCIP)
 949                         printf(" !");
 950
 951                 printf(" -s %s/%u", inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof(buf)),
 952                                     xtables_ip6mask_to_cidr(&e->ipv6.smsk));
 953         }
 954
 955         if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
 956         {
 957                 if (e->ipv6.flags & IP6T_INV_DSTIP)
 958                         printf(" !");
 959
 960                 printf(" -d %s/%u", inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof(buf)),
 961                                     xtables_ip6mask_to_cidr(&e->ipv6.dmsk));
 962         }
 963 }
 964 #endif
 965
 966 static void
 967 rule_print4(struct ipt_entry *e)
 968 {
 969         struct in_addr in_zero = { 0 };
 970         char buf[sizeof("255.255.255.255\0")];
 971         char *pname;
 972
 973         if (e->ip.proto)
 974         {
 975                 if (e->ip.flags & XT_INV_PROTO)
 976                         printf(" !");
 977
 978                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
 979
 980                 if (pname)
 981                         printf(" -p %s", pname);
 982                 else
 983                         printf(" -p %u", e->ip.proto);
 984         }
 985
 986         if (e->ip.iniface[0])
 987         {
 988                 if (e->ip.flags & IPT_INV_VIA_IN)
 989                         printf(" !");
 990
 991                 printf(" -i %s", e->ip.iniface);
 992         }
 993
 994         if (e->ip.outiface[0])
 995         {
 996                 if (e->ip.flags & IPT_INV_VIA_OUT)
 997                         printf(" !");
 998
 999                 printf(" -o %s", e->ip.outiface);
1000         }
1001
1002         if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
1003         {
1004                 if (e->ip.flags & IPT_INV_SRCIP)
1005                         printf(" !");
1006
1007                 printf(" -s %s/%u", inet_ntop(AF_INET, &e->ip.src, buf, sizeof(buf)),
1008                                     xtables_ipmask_to_cidr(&e->ip.smsk));
1009         }
1010
1011         if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1012         {
1013                 if (e->ip.flags & IPT_INV_DSTIP)
1014                         printf(" !");
1015
1016                 printf(" -d %s/%u", inet_ntop(AF_INET, &e->ip.dst, buf, sizeof(buf)),
1017                                     xtables_ipmask_to_cidr(&e->ip.dmsk));
1018         }
1019 }
1020
1021 static void
1022 rule_print(struct fw3_ipt_rule *r, const char *chain)
1023 {
1024         struct xtables_rule_match *rm;
1025         struct xtables_match *m;
1026         struct xtables_target *t;
1027
1028         debug(r->h, "-A %s", chain);
1029
1030 #ifndef DISABLE_IPV6
1031         if (r->h->family == FW3_FAMILY_V6)
1032                 rule_print6(&r->e6);
1033         else
1034 #endif
1035                 rule_print4(&r->e);
1036
1037         for (rm = r->matches; rm; rm = rm->next)
1038         {
1039                 m = rm->match;
1040                 printf(" -m %s", fw3_xt_get_match_name(m));
1041
1042                 if (m->save)
1043                         m->save(&r->e.ip, m->m);
1044         }
1045
1046         if (r->target)
1047         {
1048                 t = r->target;
1049                 printf(" -j %s", fw3_xt_get_target_name(t));
1050
1051                 if (t->save)
1052                         t->save(&r->e.ip, t->t);
1053         }
1054
1055         printf("\n");
1056 }
1057
1058 static bool
1059 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1060 {
1061         struct xtables_rule_match *m;
1062         struct xtables_match *em;
1063
1064         /* is a target option */
1065         if (r->target && fw3_xt_has_target_parse(r->target) &&
1066                 optc >= r->target->option_offset &&
1067                 optc < (r->target->option_offset + 256))
1068         {
1069                 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1070                 return false;
1071         }
1072
1073         /* try to dispatch argument to one of the match parsers */
1074         for (m = r->matches; m; m = m->next)
1075         {
1076                 em = m->match;
1077
1078                 if (m->completed || !fw3_xt_has_match_parse(em))
1079                         continue;
1080
1081                 if (optc < em->option_offset ||
1082                         optc >= (em->option_offset + 256))
1083                         continue;
1084
1085                 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1086                 return false;
1087         }
1088
1089         /* unhandled option, might belong to a protocol match */
1090         if ((em = load_protomatch(r)) != NULL)
1091         {
1092                 init_match(r, em, false);
1093
1094                 r->protocol_loaded = true;
1095                 optind--;
1096
1097                 return true;
1098         }
1099
1100         if (optc == ':')
1101                 fprintf(stderr, "parse_option(): option '%s' needs argument\n",
1102                         r->argv[optind-1]);
1103
1104         if (optc == '?')
1105                 fprintf(stderr, "parse_option(): unknown option '%s'\n",
1106                         r->argv[optind-1]);
1107
1108         return false;
1109 }
1110
1111 void
1112 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1113                     const char *k, const char *v)
1114 {
1115         int n;
1116         char **tmp;
1117
1118         if (!k)
1119                 return;
1120
1121         n = inv + !!k + !!v;
1122         tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1123
1124         if (!tmp)
1125                 return;
1126
1127         r->argv = tmp;
1128
1129         if (inv)
1130                 r->argv[r->argc++] = fw3_strdup("!");
1131
1132         r->argv[r->argc++] = fw3_strdup(k);
1133
1134         if (v)
1135                 r->argv[r->argc++] = fw3_strdup(v);
1136 }
1137
1138 void
1139 fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...)
1140 {
1141         size_t s;
1142         struct xtables_rule_match *m;
1143         struct xtables_match *em;
1144         struct xtables_target *et;
1145         struct xtables_globals *g;
1146         struct ipt_entry *e;
1147
1148         int i, optc;
1149         bool inv = false;
1150         char buf[32];
1151         va_list ap;
1152
1153         va_start(ap, fmt);
1154         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1155         va_end(ap);
1156
1157         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1158         g->opts = g->orig_opts;
1159
1160         optind = 0;
1161         opterr = 0;
1162
1163         while ((optc = getopt_long(r->argc, r->argv, "m:j:", g->opts, NULL)) != -1)
1164         {
1165                 switch (optc)
1166                 {
1167                 case 'm':
1168                         em = find_match(r, optarg);
1169
1170                         if (!em)
1171                         {
1172                                 fprintf(stderr, "fw3_ipt_rule_append(): Can't find match '%s'\n", optarg);
1173                                 goto free;
1174                         }
1175
1176                         init_match(r, em, true);
1177                         break;
1178
1179                 case 'j':
1180                         et = get_target(r, optarg);
1181
1182                         if (!et)
1183                         {
1184                                 fprintf(stderr, "fw3_ipt_rule_append(): Can't find target '%s'\n", optarg);
1185                                 goto free;
1186                         }
1187
1188                         break;
1189
1190                 case 1:
1191                         if ((optarg[0] == '!') && (optarg[1] == '\0'))
1192                         {
1193                                 inv = true;
1194                                 continue;
1195                         }
1196
1197                         fprintf(stderr, "fw3_ipt_rule_append(): Bad argument '%s'\n", optarg);
1198                         return;
1199
1200                 default:
1201                         if (parse_option(r, optc, inv))
1202                                 continue;
1203                         break;
1204                 }
1205
1206                 inv = false;
1207         }
1208
1209         for (m = r->matches; m; m = m->next)
1210                 xtables_option_mfcall(m->match);
1211
1212         if (r->target)
1213                 xtables_option_tfcall(r->target);
1214
1215         if (fw3_pr_debug)
1216                 rule_print(r, buf);
1217
1218 #ifndef DISABLE_IPV6
1219         if (r->h->family == FW3_FAMILY_V6)
1220         {
1221                 struct ip6t_entry *e6;
1222
1223                 s = XT_ALIGN(sizeof(struct ip6t_entry));
1224
1225                 for (m = r->matches; m; m = m->next)
1226                         s += m->match->m->u.match_size;
1227
1228                 e6 = fw3_alloc(s + r->target->t->u.target_size);
1229
1230                 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1231
1232                 e6->target_offset = s;
1233                 e6->next_offset = s + r->target->t->u.target_size;
1234
1235                 s = 0;
1236
1237                 for (m = r->matches; m; m = m->next)
1238                 {
1239                         memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1240                         s += m->match->m->u.match_size;
1241                 }
1242
1243                 memcpy(e6->elems + s, r->target->t, r->target->t->u.target_size);
1244                 ip6tc_append_entry(buf, e6, r->h->handle);
1245                 free(e6);
1246         }
1247         else
1248 #endif
1249         {
1250                 s = XT_ALIGN(sizeof(struct ipt_entry));
1251
1252                 for (m = r->matches; m; m = m->next)
1253                         s += m->match->m->u.match_size;
1254
1255                 e = fw3_alloc(s + r->target->t->u.target_size);
1256
1257                 memcpy(e, &r->e, sizeof(struct ipt_entry));
1258
1259                 e->target_offset = s;
1260                 e->next_offset = s + r->target->t->u.target_size;
1261
1262                 s = 0;
1263
1264                 for (m = r->matches; m; m = m->next)
1265                 {
1266                         memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1267                         s += m->match->m->u.match_size;
1268                 }
1269
1270                 memcpy(e->elems + s, r->target->t, r->target->t->u.target_size);
1271
1272                 if (!iptc_append_entry(buf, e, r->h->handle))
1273                         fprintf(stderr, "iptc_append_entry(): %s\n", iptc_strerror(errno));
1274
1275                 free(e);
1276         }
1277
1278 free:
1279         for (i = 1; i < r->argc; i++)
1280                 free(r->argv[i]);
1281
1282         free(r->argv);
1283
1284         xtables_rule_matches_free(&r->matches);
1285
1286         if (r->target)
1287                 free(r->target->t);
1288
1289         free(r);
1290
1291         /* reset all targets and matches */
1292         for (em = xtables_matches; em; em = em->next)
1293                 em->mflags = 0;
1294
1295         for (et = xtables_targets; et; et = et->next)
1296         {
1297                 et->tflags = 0;
1298                 et->used = 0;
1299         }
1300
1301         xtables_free_opts(1);
1302 }
1303
1304 struct fw3_ipt_rule *
1305 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1306                     struct fw3_device *in, struct fw3_device *out,
1307                     struct fw3_address *src, struct fw3_address *dest)
1308 {
1309         struct fw3_ipt_rule *r;
1310
1311         r = fw3_ipt_rule_new(handle);
1312
1313         fw3_ipt_rule_proto(r, proto);
1314         fw3_ipt_rule_in_out(r, in, out);
1315         fw3_ipt_rule_src_dest(r, src, dest);
1316
1317         return r;
1318 }