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;
  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 = LINUX_VERSION(x, y, z);
  55 }
  56
  57 #undef __ipt_module
  58 #define __ipt_module(x) libxt_##x##_init, libipt_##x##_init, libip6t_##x##_init,
  59
  60 static void fw3_init_extensions(void)
  61 {
  62         int i;
  63         void (*initfuncs[])(void) = { FW3_IPT_MODULES };
  64
  65         for (i = 0; i < sizeof(initfuncs)/sizeof(initfuncs[0]); i++)
  66                 if (initfuncs[i])
  67                         initfuncs[i]();
  68 }
  69
  70 struct fw3_ipt_handle *
  71 fw3_ipt_open(enum fw3_family family, enum fw3_table table)
  72 {
  73         struct fw3_ipt_handle *h;
  74
  75         h = fw3_alloc(sizeof(*h));
  76
  77         xtables_init();
  78
  79         if (family == FW3_FAMILY_V6)
  80         {
  81                 h->family = FW3_FAMILY_V6;
  82                 h->table  = table;
  83                 h->handle = ip6tc_init(fw3_flag_names[table]);
  84
  85                 xtables_set_params(&xtg6);
  86                 xtables_set_nfproto(NFPROTO_IPV6);
  87         }
  88         else
  89         {
  90                 h->family = FW3_FAMILY_V4;
  91                 h->table  = table;
  92                 h->handle = iptc_init(fw3_flag_names[table]);
  93
  94                 xtables_set_params(&xtg);
  95                 xtables_set_nfproto(NFPROTO_IPV4);
  96         }
  97
  98         if (!h->handle)
  99         {
 100                 free(h);
 101                 return NULL;
 102         }
 103
 104         xtables_pending_matches = NULL;
 105         xtables_pending_targets = NULL;
 106
 107         xtables_matches = NULL;
 108         xtables_targets = NULL;
 109
 110         fw3_init_extensions();
 111
 112         return h;
 113 }
 114
 115 static void
 116 debug(struct fw3_ipt_handle *h, const char *fmt, ...)
 117 {
 118         va_list ap;
 119
 120         printf("%s -t %s ", (h->family == FW3_FAMILY_V6) ? "ip6tables" : "iptables",
 121                             fw3_flag_names[h->table]);
 122
 123         va_start(ap, fmt);
 124         vprintf(fmt, ap);
 125         va_end(ap);
 126 }
 127
 128 void
 129 fw3_ipt_set_policy(struct fw3_ipt_handle *h, const char *chain,
 130                    enum fw3_flag policy)
 131 {
 132         if (fw3_pr_debug)
 133                 debug(h, "-P %s %s\n", chain, fw3_flag_names[policy]);
 134
 135         if (h->family == FW3_FAMILY_V6)
 136                 ip6tc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 137         else
 138                 iptc_set_policy(chain, fw3_flag_names[policy], NULL, h->handle);
 139 }
 140
 141 void
 142 fw3_ipt_delete_chain(struct fw3_ipt_handle *h, const char *chain)
 143 {
 144         if (fw3_pr_debug)
 145         {
 146                 debug(h, "-F %s\n", chain);
 147                 debug(h, "-X %s\n", chain);
 148         }
 149
 150         if (h->family == FW3_FAMILY_V6)
 151         {
 152                 if (ip6tc_flush_entries(chain, h->handle))
 153                         ip6tc_delete_chain(chain, h->handle);
 154         }
 155         else
 156         {
 157                 if (iptc_flush_entries(chain, h->handle))
 158                         iptc_delete_chain(chain, h->handle);
 159         }
 160 }
 161
 162 void
 163 fw3_ipt_delete_rules(struct fw3_ipt_handle *h, const char *target)
 164 {
 165         unsigned int num;
 166         const struct ipt_entry *e;
 167         const struct ip6t_entry *e6;
 168         const char *chain;
 169         const char *t;
 170         bool found;
 171
 172         if (h->family == FW3_FAMILY_V6)
 173         {
 174                 for (chain = ip6tc_first_chain(h->handle);
 175                      chain != NULL;
 176                      chain = ip6tc_next_chain(h->handle))
 177                 {
 178                         do {
 179                                 found = false;
 180
 181                                 for (num = 0, e6 = ip6tc_first_rule(chain, h->handle);
 182                                          e6 != NULL;
 183                                          num++, e6 = ip6tc_next_rule(e6, h->handle))
 184                                 {
 185                                         t = ip6tc_get_target(e6, h->handle);
 186
 187                                         if (*t && !strcmp(t, target))
 188                                         {
 189                                                 if (fw3_pr_debug)
 190                                                         debug(h, "-D %s %u\n", chain, num + 1);
 191
 192                                                 ip6tc_delete_num_entry(chain, num, h->handle);
 193                                                 found = true;
 194                                                 break;
 195                                         }
 196                                 }
 197                         } while (found);
 198                 }
 199         }
 200         else
 201         {
 202                 for (chain = iptc_first_chain(h->handle);
 203                      chain != NULL;
 204                      chain = iptc_next_chain(h->handle))
 205                 {
 206                         do {
 207                                 found = false;
 208
 209                                 for (num = 0, e = iptc_first_rule(chain, h->handle);
 210                                      e != NULL;
 211                                          num++, e = iptc_next_rule(e, h->handle))
 212                                 {
 213                                         t = iptc_get_target(e, h->handle);
 214
 215                                         if (*t && !strcmp(t, target))
 216                                         {
 217                                                 if (fw3_pr_debug)
 218                                                         debug(h, "-D %s %u\n", chain, num + 1);
 219
 220                                                 iptc_delete_num_entry(chain, num, h->handle);
 221                                                 found = true;
 222                                                 break;
 223                                         }
 224                                 }
 225                         } while (found);
 226                 }
 227         }
 228 }
 229
 230 void
 231 fw3_ipt_create_chain(struct fw3_ipt_handle *h, const char *fmt, ...)
 232 {
 233         char buf[32];
 234         va_list ap;
 235
 236         va_start(ap, fmt);
 237         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 238         va_end(ap);
 239
 240         if (fw3_pr_debug)
 241                 debug(h, "-N %s\n", buf);
 242
 243         iptc_create_chain(buf, h->handle);
 244 }
 245
 246 void
 247 fw3_ipt_flush(struct fw3_ipt_handle *h)
 248 {
 249         const char *chain;
 250
 251         if (h->family == FW3_FAMILY_V6)
 252         {
 253                 for (chain = ip6tc_first_chain(h->handle);
 254                      chain != NULL;
 255                      chain = ip6tc_next_chain(h->handle))
 256                 {
 257                         ip6tc_flush_entries(chain, h->handle);
 258                 }
 259
 260                 for (chain = ip6tc_first_chain(h->handle);
 261                      chain != NULL;
 262                      chain = ip6tc_next_chain(h->handle))
 263                 {
 264                         ip6tc_delete_chain(chain, h->handle);
 265                 }
 266         }
 267         else
 268         {
 269                 for (chain = iptc_first_chain(h->handle);
 270                      chain != NULL;
 271                      chain = iptc_next_chain(h->handle))
 272                 {
 273                         iptc_flush_entries(chain, h->handle);
 274                 }
 275
 276                 for (chain = iptc_first_chain(h->handle);
 277                      chain != NULL;
 278                      chain = iptc_next_chain(h->handle))
 279                 {
 280                         iptc_delete_chain(chain, h->handle);
 281                 }
 282         }
 283 }
 284
 285 void
 286 fw3_ipt_commit(struct fw3_ipt_handle *h)
 287 {
 288         int rv;
 289
 290         if (h->family == FW3_FAMILY_V6)
 291         {
 292                 rv = ip6tc_commit(h->handle);
 293                 if (!rv)
 294                         fprintf(stderr, "ip6tc_commit(): %s\n", ip6tc_strerror(errno));
 295         }
 296         else
 297         {
 298                 rv = iptc_commit(h->handle);
 299                 if (!rv)
 300                         fprintf(stderr, "iptc_commit(): %s\n", iptc_strerror(errno));
 301         }
 302
 303         free(h);
 304 }
 305
 306 struct fw3_ipt_rule *
 307 fw3_ipt_rule_new(struct fw3_ipt_handle *h)
 308 {
 309         struct fw3_ipt_rule *r;
 310
 311         r = fw3_alloc(sizeof(*r));
 312
 313         r->h = h;
 314         r->argv = fw3_alloc(sizeof(char *));
 315         r->argv[r->argc++] = "fw3";
 316
 317         return r;
 318 }
 319
 320
 321 static bool
 322 is_chain(struct fw3_ipt_handle *h, const char *name)
 323 {
 324         if (h->family == FW3_FAMILY_V6)
 325                 return ip6tc_is_chain(name, h->handle);
 326         else
 327                 return iptc_is_chain(name, h->handle);
 328 }
 329
 330 static char *
 331 get_protoname(struct fw3_ipt_rule *r)
 332 {
 333         const struct xtables_pprot *pp;
 334
 335         if (r->protocol)
 336                 for (pp = xtables_chain_protos; pp->name; pp++)
 337                         if (pp->num == r->protocol)
 338                                 return (char *)pp->name;
 339
 340         return NULL;
 341 }
 342
 343 static struct xtables_match *
 344 find_match(struct fw3_ipt_rule *r, const char *name)
 345 {
 346         return xtables_find_match(name, XTF_TRY_LOAD, &r->matches);
 347 }
 348
 349 static void
 350 init_match(struct fw3_ipt_rule *r, struct xtables_match *m, bool no_clone)
 351 {
 352         size_t s;
 353         struct xtables_globals *g;
 354
 355         if (!m)
 356                 return;
 357
 358         s = XT_ALIGN(sizeof(struct xt_entry_match)) + m->size;
 359
 360         m->m = fw3_alloc(s);
 361         strcpy(m->m->u.user.name, m->real_name ? m->real_name : m->name);
 362         m->m->u.user.revision = m->revision;
 363         m->m->u.match_size = s;
 364
 365         /* free previous userspace data */
 366         if (m->udata_size)
 367         {
 368                 free(m->udata);
 369                 m->udata = fw3_alloc(m->udata_size);
 370         }
 371
 372         if (m->init)
 373                 m->init(m->m);
 374
 375         /* don't merge options if no_clone is set and this match is a clone */
 376         if (no_clone && (m == m->next))
 377                 return;
 378
 379         /* merge option table */
 380         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 381
 382         if (m->x6_options)
 383                 g->opts = xtables_options_xfrm(g->orig_opts, g->opts,
 384                                                                            m->x6_options, &m->option_offset);
 385
 386         if (m->extra_opts)
 387                 g->opts = xtables_merge_options(g->orig_opts, g->opts,
 388                                                                                 m->extra_opts, &m->option_offset);
 389 }
 390
 391 static bool
 392 need_protomatch(struct fw3_ipt_rule *r, const char *pname)
 393 {
 394         if (!pname)
 395                 return false;
 396
 397         if (!xtables_find_match(pname, XTF_DONT_LOAD, NULL))
 398                 return true;
 399
 400         return !r->protocol_loaded;
 401 }
 402
 403 static struct xtables_match *
 404 load_protomatch(struct fw3_ipt_rule *r)
 405 {
 406         const char *pname = get_protoname(r);
 407
 408         if (!need_protomatch(r, pname))
 409                 return NULL;
 410
 411         return find_match(r, pname);
 412 }
 413
 414 static struct xtables_target *
 415 get_target(struct fw3_ipt_rule *r, const char *name)
 416 {
 417         size_t s;
 418         struct xtables_target *t;
 419         struct xtables_globals *g;
 420
 421         bool chain = is_chain(r->h, name);
 422
 423         if (chain)
 424                 t = xtables_find_target(XT_STANDARD_TARGET, XTF_LOAD_MUST_SUCCEED);
 425         else
 426                 t = xtables_find_target(name, XTF_TRY_LOAD);
 427
 428         if (!t)
 429                 return NULL;
 430
 431         s = XT_ALIGN(sizeof(struct xt_entry_target)) + t->size;
 432         t->t = fw3_alloc(s);
 433
 434         if (!t->real_name)
 435                 strcpy(t->t->u.user.name, name);
 436         else
 437                 strcpy(t->t->u.user.name, t->real_name);
 438
 439         t->t->u.user.revision = t->revision;
 440         t->t->u.target_size = s;
 441
 442         if (t->udata_size)
 443         {
 444                 free(t->udata);
 445                 t->udata = fw3_alloc(t->udata_size);
 446         }
 447
 448         if (t->init)
 449                 t->init(t->t);
 450
 451         /* merge option table */
 452         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
 453
 454         if (t->x6_options)
 455                 g->opts = xtables_options_xfrm(g->orig_opts, g->opts,
 456                                                t->x6_options, &t->option_offset);
 457         else
 458                 g->opts = xtables_merge_options(g->orig_opts, g->opts,
 459                                                 t->extra_opts, &t->option_offset);
 460
 461         r->target = t;
 462
 463         return t;
 464 }
 465
 466 void
 467 fw3_ipt_rule_proto(struct fw3_ipt_rule *r, struct fw3_protocol *proto)
 468 {
 469         uint32_t pr;
 470
 471         if (!proto || proto->any)
 472                 return;
 473
 474         pr = proto->protocol;
 475
 476         if (r->h->family == FW3_FAMILY_V6)
 477         {
 478                 if (pr == 1)
 479                         pr = 58;
 480
 481                 r->e6.ipv6.proto = pr;
 482                 r->e6.ipv6.flags |= IP6T_F_PROTO;
 483
 484                 if (proto->invert)
 485                         r->e6.ipv6.invflags |= XT_INV_PROTO;
 486         }
 487         else
 488         {
 489                 r->e.ip.proto = pr;
 490
 491                 if (proto->invert)
 492                         r->e.ip.invflags |= XT_INV_PROTO;
 493         }
 494
 495         r->protocol = pr;
 496 }
 497
 498 void
 499 fw3_ipt_rule_in_out(struct fw3_ipt_rule *r,
 500                     struct fw3_device *in, struct fw3_device *out)
 501 {
 502         if (r->h->family == FW3_FAMILY_V6)
 503         {
 504                 if (in && !in->any)
 505                 {
 506                         xtables_parse_interface(in->name, r->e6.ipv6.iniface,
 507                                                           r->e6.ipv6.iniface_mask);
 508
 509                         if (in->invert)
 510                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_IN;
 511                 }
 512
 513                 if (out && !out->any)
 514                 {
 515                         xtables_parse_interface(out->name, r->e6.ipv6.outiface,
 516                                                            r->e6.ipv6.outiface_mask);
 517
 518                         if (out->invert)
 519                                 r->e6.ipv6.invflags |= IP6T_INV_VIA_OUT;
 520                 }
 521         }
 522         else
 523         {
 524                 if (in && !in->any)
 525                 {
 526                         xtables_parse_interface(in->name, r->e.ip.iniface,
 527                                                           r->e.ip.iniface_mask);
 528
 529                         if (in->invert)
 530                                 r->e.ip.invflags |= IPT_INV_VIA_IN;
 531                 }
 532
 533                 if (out && !out->any)
 534                 {
 535                         xtables_parse_interface(out->name, r->e.ip.outiface,
 536                                                            r->e.ip.outiface_mask);
 537
 538                         if (out->invert)
 539                                 r->e.ip.invflags |= IPT_INV_VIA_OUT;
 540                 }
 541         }
 542 }
 543
 544
 545 static void
 546 ip4prefix2mask(int prefix, struct in_addr *mask)
 547 {
 548         mask->s_addr = htonl(~((1 << (32 - prefix)) - 1));
 549 }
 550
 551 static void
 552 ip6prefix2mask(int prefix, struct in6_addr *mask)
 553 {
 554         char *p = (char *)mask;
 555
 556         if (prefix > 0)
 557         {
 558                 memset(p, 0xff, prefix / 8);
 559                 memset(p + (prefix / 8) + 1, 0, (128 - prefix) / 8);
 560                 p[prefix / 8] = 0xff << (8 - (prefix & 7));
 561         }
 562         else
 563         {
 564                 memset(mask, 0, sizeof(*mask));
 565         }
 566 }
 567
 568 void
 569 fw3_ipt_rule_src_dest(struct fw3_ipt_rule *r,
 570                       struct fw3_address *src, struct fw3_address *dest)
 571 {
 572         int i;
 573
 574         if ((src && src->range) || (dest && dest->range))
 575         {
 576                 fw3_ipt_rule_addarg(r, false, "-m", "iprange");
 577         }
 578
 579         if (src && src->set)
 580         {
 581                 if (src->range)
 582                 {
 583                         fw3_ipt_rule_addarg(r, src->invert, "--src-range",
 584                                             fw3_address_to_string(src, false));
 585                 }
 586                 else if (r->h->family == FW3_FAMILY_V6)
 587                 {
 588                         r->e6.ipv6.src = src->address.v6;
 589                         ip6prefix2mask(src->mask, &r->e6.ipv6.smsk);
 590
 591                         for (i = 0; i < 4; i++)
 592                                 r->e6.ipv6.src.s6_addr32[i] &= r->e6.ipv6.smsk.s6_addr32[i];
 593
 594                         if (src->invert)
 595                                 r->e6.ipv6.invflags |= IP6T_INV_SRCIP;
 596                 }
 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                 else if (r->h->family == FW3_FAMILY_V6)
 617                 {
 618                         r->e6.ipv6.dst = dest->address.v6;
 619                         ip6prefix2mask(dest->mask, &r->e6.ipv6.dmsk);
 620
 621                         for (i = 0; i < 4; i++)
 622                                 r->e6.ipv6.dst.s6_addr32[i] &= r->e6.ipv6.dmsk.s6_addr32[i];
 623
 624                         if (dest->invert)
 625                                 r->e6.ipv6.invflags |= IP6T_INV_DSTIP;
 626                 }
 627                 else
 628                 {
 629                         r->e.ip.dst = dest->address.v4;
 630                         ip4prefix2mask(dest->mask, &r->e.ip.dmsk);
 631
 632                         r->e.ip.dst.s_addr &= r->e.ip.dmsk.s_addr;
 633
 634                         if (dest->invert)
 635                                 r->e.ip.invflags |= IPT_INV_DSTIP;
 636                 }
 637         }
 638 }
 639
 640 void
 641 fw3_ipt_rule_sport_dport(struct fw3_ipt_rule *r,
 642                          struct fw3_port *sp, struct fw3_port *dp)
 643 {
 644         char buf[sizeof("65535:65535\0")];
 645
 646         if ((!sp || !sp->set) && (!dp || !dp->set))
 647                 return;
 648
 649         if (!get_protoname(r))
 650                 return;
 651
 652         if (sp && sp->set)
 653         {
 654                 if (sp->port_min == sp->port_max)
 655                         sprintf(buf, "%u", sp->port_min);
 656                 else
 657                         sprintf(buf, "%u:%u", sp->port_min, sp->port_max);
 658
 659                 fw3_ipt_rule_addarg(r, sp->invert, "--sport", buf);
 660         }
 661
 662         if (dp && dp->set)
 663         {
 664                 if (dp->port_min == dp->port_max)
 665                         sprintf(buf, "%u", dp->port_min);
 666                 else
 667                         sprintf(buf, "%u:%u", dp->port_min, dp->port_max);
 668
 669                 fw3_ipt_rule_addarg(r, dp->invert, "--dport", buf);
 670         }
 671 }
 672
 673 void
 674 fw3_ipt_rule_mac(struct fw3_ipt_rule *r, struct fw3_mac *mac)
 675 {
 676         if (!mac)
 677                 return;
 678
 679         fw3_ipt_rule_addarg(r, false, "-m", "mac");
 680         fw3_ipt_rule_addarg(r, mac->invert, "--mac-source", ether_ntoa(&mac->mac));
 681 }
 682
 683 void
 684 fw3_ipt_rule_icmptype(struct fw3_ipt_rule *r, struct fw3_icmptype *icmp)
 685 {
 686         char buf[sizeof("255/255\0")];
 687
 688         if (!icmp)
 689                 return;
 690
 691         if (r->h->family == FW3_FAMILY_V6)
 692         {
 693                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
 694                         sprintf(buf, "%u", icmp->type6);
 695                 else
 696                         sprintf(buf, "%u/%u", icmp->type6, icmp->code6_min);
 697
 698                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmpv6-type", buf);
 699         }
 700         else
 701         {
 702                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
 703                         sprintf(buf, "%u", icmp->type);
 704                 else
 705                         sprintf(buf, "%u/%u", icmp->type, icmp->code_min);
 706
 707                 fw3_ipt_rule_addarg(r, icmp->invert, "--icmp-type", buf);
 708         }
 709 }
 710
 711 void
 712 fw3_ipt_rule_limit(struct fw3_ipt_rule *r, struct fw3_limit *limit)
 713 {
 714         char buf[sizeof("-4294967296/second\0")];
 715
 716         if (!limit || limit->rate <= 0)
 717                 return;
 718
 719         fw3_ipt_rule_addarg(r, false, "-m", "limit");
 720
 721         sprintf(buf, "%u/%s", limit->rate, fw3_limit_units[limit->unit]);
 722         fw3_ipt_rule_addarg(r, limit->invert, "--limit", buf);
 723
 724         if (limit->burst > 0)
 725         {
 726                 sprintf(buf, "%u", limit->burst);
 727                 fw3_ipt_rule_addarg(r, limit->invert, "--limit-burst", buf);
 728         }
 729 }
 730
 731 void
 732 fw3_ipt_rule_ipset(struct fw3_ipt_rule *r, struct fw3_ipset *ipset,
 733                    bool invert)
 734 {
 735         char buf[sizeof("dst,dst,dst\0")];
 736         char *p = buf;
 737
 738         struct fw3_ipset_datatype *type;
 739
 740         if (!ipset)
 741                 return;
 742
 743         list_for_each_entry(type, &ipset->datatypes, list)
 744         {
 745                 if (p > buf)
 746                         *p++ = ',';
 747
 748                 p += sprintf(p, "%s", type->dest ? "dst" : "src");
 749         }
 750
 751         fw3_ipt_rule_addarg(r, false, "-m", "set");
 752
 753         fw3_ipt_rule_addarg(r, invert, "--match-set",
 754                             ipset->external ? ipset->external : ipset->name);
 755
 756         fw3_ipt_rule_addarg(r, false, buf, NULL);
 757 }
 758
 759 void
 760 fw3_ipt_rule_time(struct fw3_ipt_rule *r, struct fw3_time *time)
 761 {
 762         int i;
 763         struct tm empty = { 0 };
 764
 765         char buf[84]; /* sizeof("1,2,3,...,30,31\0") */
 766         char *p;
 767
 768         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
 769         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 770
 771         if (!d1 && !d2 && !time->timestart && !time->timestop &&
 772             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
 773         {
 774                 return;
 775         }
 776
 777         fw3_ipt_rule_addarg(r, false, "-m", "time");
 778
 779         if (time->utc)
 780                 fw3_ipt_rule_addarg(r, false, "--utc", NULL);
 781
 782         if (d1)
 783         {
 784                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
 785                 fw3_ipt_rule_addarg(r, false, "--datestart", buf);
 786         }
 787
 788         if (d2)
 789         {
 790                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
 791                 fw3_ipt_rule_addarg(r, false, "--datestop", buf);
 792         }
 793
 794         if (time->timestart)
 795         {
 796                 sprintf(buf, "%02d:%02d:%02d",
 797                         time->timestart / 3600,
 798                         time->timestart % 3600 / 60,
 799                         time->timestart % 60);
 800
 801                 fw3_ipt_rule_addarg(r, false, "--timestart", buf);
 802         }
 803
 804         if (time->timestop)
 805         {
 806                 sprintf(buf, "%02d:%02d:%02d",
 807                         time->timestop / 3600,
 808                         time->timestop % 3600 / 60,
 809                         time->timestop % 60);
 810
 811                 fw3_ipt_rule_addarg(r, false, "--timestop", buf);
 812         }
 813
 814         if (time->monthdays & 0xFFFFFFFE)
 815         {
 816                 for (i = 1, p = buf; i < 32; i++)
 817                 {
 818                         if (hasbit(time->monthdays, i))
 819                         {
 820                                 if (p > buf)
 821                                         *p++ = ',';
 822
 823                                 p += sprintf(p, "%u", i);
 824                         }
 825                 }
 826
 827                 fw3_ipt_rule_addarg(r, hasbit(time->monthdays, 0), "--monthdays", buf);
 828         }
 829
 830         if (time->weekdays & 0xFE)
 831         {
 832                 for (i = 1, p = buf; i < 8; i++)
 833                 {
 834                         if (hasbit(time->weekdays, i))
 835                         {
 836                                 if (p > buf)
 837                                         *p++ = ',';
 838
 839                                 p += sprintf(p, "%u", i);
 840                         }
 841                 }
 842
 843                 fw3_ipt_rule_addarg(r, hasbit(time->weekdays, 0), "--weekdays", buf);
 844         }
 845 }
 846
 847 void
 848 fw3_ipt_rule_mark(struct fw3_ipt_rule *r, struct fw3_mark *mark)
 849 {
 850         char buf[sizeof("0xFFFFFFFF/0xFFFFFFFF\0")];
 851
 852         if (!mark || !mark->set)
 853                 return;
 854
 855         if (mark->mask < 0xFFFFFFFF)
 856                 sprintf(buf, "0x%x/0x%x", mark->mark, mark->mask);
 857         else
 858                 sprintf(buf, "0x%x", mark->mark);
 859
 860         fw3_ipt_rule_addarg(r, false, "-m", "mark");
 861         fw3_ipt_rule_addarg(r, mark->invert, "--mark", buf);
 862 }
 863
 864 void
 865 fw3_ipt_rule_comment(struct fw3_ipt_rule *r, const char *fmt, ...)
 866 {
 867         va_list ap;
 868         char buf[256];
 869
 870         if (!fmt || !*fmt)
 871                 return;
 872
 873         va_start(ap, fmt);
 874         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
 875         va_end(ap);
 876
 877         fw3_ipt_rule_addarg(r, false, "-m", "comment");
 878         fw3_ipt_rule_addarg(r, false, "--comment", buf);
 879 }
 880
 881 void
 882 fw3_ipt_rule_extra(struct fw3_ipt_rule *r, const char *extra)
 883 {
 884         char *p, **tmp, *s;
 885
 886         if (!extra || !*extra)
 887                 return;
 888
 889         s = fw3_strdup(extra);
 890
 891         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 892         {
 893                 tmp = realloc(r->argv, (r->argc + 1) * sizeof(*r->argv));
 894
 895                 if (!tmp)
 896                         break;
 897
 898                 r->argv = tmp;
 899                 r->argv[r->argc++] = fw3_strdup(p);
 900         }
 901
 902         free(s);
 903 }
 904
 905 static void
 906 rule_print6(struct ip6t_entry *e)
 907 {
 908         char buf[INET6_ADDRSTRLEN];
 909         char *pname;
 910
 911         if (e->ipv6.flags & IP6T_F_PROTO)
 912         {
 913                 if (e->ipv6.flags & XT_INV_PROTO)
 914                         printf(" !");
 915
 916                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e6));
 917
 918                 if (pname)
 919                         printf(" -p %s", pname);
 920                 else
 921                         printf(" -p %u", e->ipv6.proto);
 922         }
 923
 924         if (e->ipv6.iniface[0])
 925         {
 926                 if (e->ipv6.flags & IP6T_INV_VIA_IN)
 927                         printf(" !");
 928
 929                 printf(" -i %s", e->ipv6.iniface);
 930         }
 931
 932         if (e->ipv6.outiface[0])
 933         {
 934                 if (e->ipv6.flags & IP6T_INV_VIA_OUT)
 935                         printf(" !");
 936
 937                 printf(" -o %s", e->ipv6.outiface);
 938         }
 939
 940         if (memcmp(&e->ipv6.src, &in6addr_any, sizeof(struct in6_addr)))
 941         {
 942                 if (e->ipv6.flags & IP6T_INV_SRCIP)
 943                         printf(" !");
 944
 945                 printf(" -s %s/%u", inet_ntop(AF_INET6, &e->ipv6.src, buf, sizeof(buf)),
 946                                     xtables_ip6mask_to_cidr(&e->ipv6.smsk));
 947         }
 948
 949         if (memcmp(&e->ipv6.dst, &in6addr_any, sizeof(struct in6_addr)))
 950         {
 951                 if (e->ipv6.flags & IP6T_INV_DSTIP)
 952                         printf(" !");
 953
 954                 printf(" -d %s/%u", inet_ntop(AF_INET6, &e->ipv6.dst, buf, sizeof(buf)),
 955                                     xtables_ip6mask_to_cidr(&e->ipv6.dmsk));
 956         }
 957 }
 958
 959 static void
 960 rule_print4(struct ipt_entry *e)
 961 {
 962         struct in_addr in_zero = { 0 };
 963         char buf[sizeof("255.255.255.255\0")];
 964         char *pname;
 965
 966         if (e->ip.proto)
 967         {
 968                 if (e->ip.flags & XT_INV_PROTO)
 969                         printf(" !");
 970
 971                 pname = get_protoname(container_of(e, struct fw3_ipt_rule, e));
 972
 973                 if (pname)
 974                         printf(" -p %s", pname);
 975                 else
 976                         printf(" -p %u", e->ip.proto);
 977         }
 978
 979         if (e->ip.iniface[0])
 980         {
 981                 if (e->ip.flags & IPT_INV_VIA_IN)
 982                         printf(" !");
 983
 984                 printf(" -i %s", e->ip.iniface);
 985         }
 986
 987         if (e->ip.outiface[0])
 988         {
 989                 if (e->ip.flags & IPT_INV_VIA_OUT)
 990                         printf(" !");
 991
 992                 printf(" -o %s", e->ip.outiface);
 993         }
 994
 995         if (memcmp(&e->ip.src, &in_zero, sizeof(struct in_addr)))
 996         {
 997                 if (e->ip.flags & IPT_INV_SRCIP)
 998                         printf(" !");
 999
1000                 printf(" -s %s/%u", inet_ntop(AF_INET, &e->ip.src, buf, sizeof(buf)),
1001                                     xtables_ipmask_to_cidr(&e->ip.smsk));
1002         }
1003
1004         if (memcmp(&e->ip.dst, &in_zero, sizeof(struct in_addr)))
1005         {
1006                 if (e->ip.flags & IPT_INV_DSTIP)
1007                         printf(" !");
1008
1009                 printf(" -d %s/%u", inet_ntop(AF_INET, &e->ip.dst, buf, sizeof(buf)),
1010                                     xtables_ipmask_to_cidr(&e->ip.dmsk));
1011         }
1012 }
1013
1014 static void
1015 rule_print(struct fw3_ipt_rule *r, const char *chain)
1016 {
1017         struct xtables_rule_match *rm;
1018         struct xtables_match *m;
1019         struct xtables_target *t;
1020
1021         debug(r->h, "-A %s", chain);
1022
1023         if (r->h->family == FW3_FAMILY_V6)
1024                 rule_print6(&r->e6);
1025         else
1026                 rule_print4(&r->e);
1027
1028         for (rm = r->matches; rm; rm = rm->next)
1029         {
1030                 m = rm->match;
1031                 printf(" -m %s", m->alias ? m->alias(m->m) : m->m->u.user.name);
1032
1033                 if (m->save)
1034                         m->save(&r->e.ip, m->m);
1035         }
1036
1037         if (r->target)
1038         {
1039                 t = r->target;
1040                 printf(" -j %s", t->alias ? t->alias(t->t) : t->t->u.user.name);
1041
1042                 if (t->save)
1043                         t->save(&r->e.ip, t->t);
1044         }
1045
1046         printf("\n");
1047 }
1048
1049 static bool
1050 parse_option(struct fw3_ipt_rule *r, int optc, bool inv)
1051 {
1052         struct xtables_rule_match *m;
1053         struct xtables_match *em;
1054
1055         /* is a target option */
1056         if (r->target && (r->target->parse || r->target->x6_parse) &&
1057                 optc >= r->target->option_offset &&
1058                 optc < (r->target->option_offset + 256))
1059         {
1060                 xtables_option_tpcall(optc, r->argv, inv, r->target, &r->e);
1061                 return false;
1062         }
1063
1064         /* try to dispatch argument to one of the match parsers */
1065         for (m = r->matches; m; m = m->next)
1066         {
1067                 em = m->match;
1068
1069                 if (m->completed || (!em->parse && !em->x6_parse))
1070                         continue;
1071
1072                 if (optc < em->option_offset ||
1073                         optc >= (em->option_offset + 256))
1074                         continue;
1075
1076                 xtables_option_mpcall(optc, r->argv, inv, em, &r->e);
1077                 return false;
1078         }
1079
1080         /* unhandled option, might belong to a protocol match */
1081         if ((em = load_protomatch(r)) != NULL)
1082         {
1083                 init_match(r, em, false);
1084
1085                 r->protocol_loaded = true;
1086                 optind--;
1087
1088                 return true;
1089         }
1090
1091         if (optc == ':')
1092                 fprintf(stderr, "parse_option(): option '%s' needs argument\n",
1093                         r->argv[optind-1]);
1094
1095         if (optc == '?')
1096                 fprintf(stderr, "parse_option(): unknown option '%s'\n",
1097                         r->argv[optind-1]);
1098
1099         return false;
1100 }
1101
1102 void
1103 fw3_ipt_rule_addarg(struct fw3_ipt_rule *r, bool inv,
1104                     const char *k, const char *v)
1105 {
1106         int n;
1107         char **tmp;
1108
1109         if (!k)
1110                 return;
1111
1112         n = inv + !!k + !!v;
1113         tmp = realloc(r->argv, (r->argc + n) * sizeof(*tmp));
1114
1115         if (!tmp)
1116                 return;
1117
1118         r->argv = tmp;
1119
1120         if (inv)
1121                 r->argv[r->argc++] = fw3_strdup("!");
1122
1123         r->argv[r->argc++] = fw3_strdup(k);
1124
1125         if (v)
1126                 r->argv[r->argc++] = fw3_strdup(v);
1127 }
1128
1129 void
1130 fw3_ipt_rule_append(struct fw3_ipt_rule *r, const char *fmt, ...)
1131 {
1132         size_t s;
1133         struct xtables_rule_match *m;
1134         struct xtables_match *em;
1135         struct xtables_target *et;
1136         struct xtables_globals *g;
1137         struct ipt_entry *e;
1138         struct ip6t_entry *e6;
1139
1140         int i, optc;
1141         bool inv = false;
1142         char buf[32];
1143         va_list ap;
1144
1145         va_start(ap, fmt);
1146         vsnprintf(buf, sizeof(buf) - 1, fmt, ap);
1147         va_end(ap);
1148
1149         g = (r->h->family == FW3_FAMILY_V6) ? &xtg6 : &xtg;
1150         g->opts = g->orig_opts;
1151
1152         optind = 0;
1153         opterr = 0;
1154
1155         while ((optc = getopt_long(r->argc, r->argv, "m:j:", g->opts, NULL)) != -1)
1156         {
1157                 switch (optc)
1158                 {
1159                 case 'm':
1160                         em = find_match(r, optarg);
1161
1162                         if (!em)
1163                         {
1164                                 fprintf(stderr, "fw3_ipt_rule_append(): Can't find match '%s'\n", optarg);
1165                                 goto free;
1166                         }
1167
1168                         init_match(r, em, true);
1169                         break;
1170
1171                 case 'j':
1172                         et = get_target(r, optarg);
1173
1174                         if (!et)
1175                         {
1176                                 fprintf(stderr, "fw3_ipt_rule_append(): Can't find target '%s'\n", optarg);
1177                                 goto free;
1178                         }
1179
1180                         break;
1181
1182                 case 1:
1183                         if ((optarg[0] == '!') && (optarg[1] == '\0'))
1184                         {
1185                                 inv = true;
1186                                 continue;
1187                         }
1188
1189                         fprintf(stderr, "fw3_ipt_rule_append(): Bad argument '%s'\n", optarg);
1190                         return;
1191
1192                 default:
1193                         if (parse_option(r, optc, inv))
1194                                 continue;
1195                         break;
1196                 }
1197
1198                 inv = false;
1199         }
1200
1201         for (m = r->matches; m; m = m->next)
1202                 xtables_option_mfcall(m->match);
1203
1204         if (r->target)
1205                 xtables_option_tfcall(r->target);
1206
1207         if (fw3_pr_debug)
1208                 rule_print(r, buf);
1209
1210         if (r->h->family == FW3_FAMILY_V6)
1211         {
1212                 s = XT_ALIGN(sizeof(struct ip6t_entry));
1213
1214                 for (m = r->matches; m; m = m->next)
1215                         s += m->match->m->u.match_size;
1216
1217                 e6 = fw3_alloc(s + r->target->t->u.target_size);
1218
1219                 memcpy(e6, &r->e6, sizeof(struct ip6t_entry));
1220
1221                 e6->target_offset = s;
1222                 e6->next_offset = s + r->target->t->u.target_size;
1223
1224                 s = 0;
1225
1226                 for (m = r->matches; m; m = m->next)
1227                 {
1228                         memcpy(e6->elems + s, m->match->m, m->match->m->u.match_size);
1229                         s += m->match->m->u.match_size;
1230                 }
1231
1232                 memcpy(e6->elems + s, r->target->t, r->target->t->u.target_size);
1233                 ip6tc_append_entry(buf, e6, r->h->handle);
1234                 free(e6);
1235         }
1236         else
1237         {
1238                 s = XT_ALIGN(sizeof(struct ipt_entry));
1239
1240                 for (m = r->matches; m; m = m->next)
1241                         s += m->match->m->u.match_size;
1242
1243                 e = fw3_alloc(s + r->target->t->u.target_size);
1244
1245                 memcpy(e, &r->e, sizeof(struct ipt_entry));
1246
1247                 e->target_offset = s;
1248                 e->next_offset = s + r->target->t->u.target_size;
1249
1250                 s = 0;
1251
1252                 for (m = r->matches; m; m = m->next)
1253                 {
1254                         memcpy(e->elems + s, m->match->m, m->match->m->u.match_size);
1255                         s += m->match->m->u.match_size;
1256                 }
1257
1258                 memcpy(e->elems + s, r->target->t, r->target->t->u.target_size);
1259
1260                 if (!iptc_append_entry(buf, e, r->h->handle))
1261                         fprintf(stderr, "iptc_append_entry(): %s\n", iptc_strerror(errno));
1262
1263                 free(e);
1264         }
1265
1266 free:
1267         for (i = 1; i < r->argc; i++)
1268                 free(r->argv[i]);
1269
1270         free(r->argv);
1271
1272         xtables_rule_matches_free(&r->matches);
1273
1274         if (r->target)
1275                 free(r->target->t);
1276
1277         free(r);
1278
1279         /* reset all targets and matches */
1280         for (em = xtables_matches; em; em = em->next)
1281                 em->mflags = 0;
1282
1283         for (et = xtables_targets; et; et = et->next)
1284         {
1285                 et->tflags = 0;
1286                 et->used = 0;
1287         }
1288
1289         xtables_free_opts(1);
1290 }
1291
1292 struct fw3_ipt_rule *
1293 fw3_ipt_rule_create(struct fw3_ipt_handle *handle, struct fw3_protocol *proto,
1294                     struct fw3_device *in, struct fw3_device *out,
1295                     struct fw3_address *src, struct fw3_address *dest)
1296 {
1297         struct fw3_ipt_rule *r;
1298
1299         r = fw3_ipt_rule_new(handle);
1300
1301         fw3_ipt_rule_proto(r, proto);
1302         fw3_ipt_rule_in_out(r, in, out);
1303         fw3_ipt_rule_src_dest(r, src, dest);
1304
1305         return r;
1306 }