utils.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 #define _GNU_SOURCE
  20 #include "utils.h"
  21 #include "options.h"
  22
  23 #include "zones.h"
  24 #include "ipsets.h"
  25
  26
  27 static int lock_fd = -1;
  28 static pid_t pipe_pid = -1;
  29 static FILE *pipe_fd = NULL;
  30
  31 bool fw3_pr_debug = false;
  32
  33
  34 static void
  35 warn_elem_section_name(struct uci_section *s, bool find_name)
  36 {
  37         int i = 0;
  38         struct uci_option *o;
  39         struct uci_element *tmp;
  40
  41         if (s->anonymous)
  42         {
  43                 uci_foreach_element(&s->package->sections, tmp)
  44                 {
  45                         if (strcmp(uci_to_section(tmp)->type, s->type))
  46                                 continue;
  47
  48                         if (&s->e == tmp)
  49                                 break;
  50
  51                         i++;
  52                 }
  53
  54                 fprintf(stderr, "@%s[%d]", s->type, i);
  55
  56                 if (find_name)
  57                 {
  58                         uci_foreach_element(&s->options, tmp)
  59                         {
  60                                 o = uci_to_option(tmp);
  61
  62                                 if (!strcmp(tmp->name, "name") && (o->type == UCI_TYPE_STRING))
  63                                 {
  64                                         fprintf(stderr, " (%s)", o->v.string);
  65                                         break;
  66                                 }
  67                         }
  68                 }
  69         }
  70         else
  71         {
  72                 fprintf(stderr, "'%s'", s->e.name);
  73         }
  74
  75         if (find_name)
  76                 fprintf(stderr, " ");
  77 }
  78
  79 void
  80 warn_elem(struct uci_element *e, const char *format, ...)
  81 {
  82         if (e->type == UCI_TYPE_SECTION)
  83         {
  84                 fprintf(stderr, "Warning: Section ");
  85                 warn_elem_section_name(uci_to_section(e), true);
  86         }
  87         else if (e->type == UCI_TYPE_OPTION)
  88         {
  89                 fprintf(stderr, "Warning: Option ");
  90                 warn_elem_section_name(uci_to_option(e)->section, false);
  91                 fprintf(stderr, ".%s ", e->name);
  92         }
  93
  94     va_list argptr;
  95     va_start(argptr, format);
  96     vfprintf(stderr, format, argptr);
  97     va_end(argptr);
  98
  99         fprintf(stderr, "\n");
 100 }
 101
 102 void
 103 warn(const char* format, ...)
 104 {
 105         fprintf(stderr, "Warning: ");
 106     va_list argptr;
 107     va_start(argptr, format);
 108     vfprintf(stderr, format, argptr);
 109     va_end(argptr);
 110         fprintf(stderr, "\n");
 111 }
 112
 113 void
 114 error(const char* format, ...)
 115 {
 116         fprintf(stderr, "Error: ");
 117     va_list argptr;
 118     va_start(argptr, format);
 119     vfprintf(stderr, format, argptr);
 120     va_end(argptr);
 121         fprintf(stderr, "\n");
 122
 123         exit(1);
 124 }
 125
 126 void
 127 info(const char* format, ...)
 128 {
 129         va_list argptr;
 130     va_start(argptr, format);
 131     vfprintf(stderr, format, argptr);
 132     va_end(argptr);
 133         fprintf(stderr, "\n");
 134 }
 135
 136 void *
 137 fw3_alloc(size_t size)
 138 {
 139         void *mem;
 140
 141         mem = calloc(1, size);
 142
 143         if (!mem)
 144                 error("Out of memory while allocating %d bytes", size);
 145
 146         return mem;
 147 }
 148
 149 char *
 150 fw3_strdup(const char *s)
 151 {
 152         char *ns;
 153
 154         ns = strdup(s);
 155
 156         if (!ns)
 157                 error("Out of memory while duplicating string '%s'", s);
 158
 159         return ns;
 160 }
 161
 162 const char *
 163 fw3_find_command(const char *cmd)
 164 {
 165         struct stat s;
 166         int plen = 0, clen = strlen(cmd) + 1;
 167         char *search, *p;
 168         static char path[PATH_MAX];
 169
 170         if (!stat(cmd, &s) && S_ISREG(s.st_mode))
 171                 return cmd;
 172
 173         search = getenv("PATH");
 174
 175         if (!search)
 176                 search = "/bin:/usr/bin:/sbin:/usr/sbin";
 177
 178         p = search;
 179
 180         do
 181         {
 182                 if (*p != ':' && *p != '\0')
 183                         continue;
 184
 185                 plen = p - search;
 186
 187                 if ((plen + clen) >= sizeof(path))
 188                         continue;
 189
 190                 strncpy(path, search, plen);
 191                 sprintf(path + plen, "/%s", cmd);
 192
 193                 if (!stat(path, &s) && S_ISREG(s.st_mode))
 194                         return path;
 195
 196                 search = p + 1;
 197         }
 198         while (*p++);
 199
 200         return NULL;
 201 }
 202
 203 bool
 204 fw3_stdout_pipe(void)
 205 {
 206         pipe_fd = stdout;
 207         return true;
 208 }
 209
 210 bool
 211 __fw3_command_pipe(bool silent, const char *command, ...)
 212 {
 213         pid_t pid;
 214         va_list argp;
 215         int pfds[2];
 216         int argn;
 217         char *arg, **args, **tmp;
 218
 219         command = fw3_find_command(command);
 220
 221         if (!command)
 222                 return false;
 223
 224         if (pipe(pfds))
 225                 return false;
 226
 227         argn = 2;
 228         args = calloc(argn, sizeof(arg));
 229
 230         if (!args)
 231                 return false;
 232
 233         args[0] = (char *)command;
 234         args[1] = NULL;
 235
 236         va_start(argp, command);
 237
 238         while ((arg = va_arg(argp, char *)) != NULL)
 239         {
 240                 tmp = realloc(args, ++argn * sizeof(arg));
 241
 242                 if (!tmp)
 243                         break;
 244
 245                 args = tmp;
 246                 args[argn-2] = arg;
 247                 args[argn-1] = NULL;
 248         }
 249
 250         va_end(argp);
 251
 252         switch ((pid = fork()))
 253         {
 254         case -1:
 255                 return false;
 256
 257         case 0:
 258                 dup2(pfds[0], 0);
 259
 260                 close(pfds[0]);
 261                 close(pfds[1]);
 262
 263                 close(1);
 264
 265                 if (silent)
 266                         close(2);
 267
 268                 execv(command, args);
 269
 270         default:
 271                 signal(SIGPIPE, SIG_IGN);
 272                 pipe_pid = pid;
 273                 close(pfds[0]);
 274                 fcntl(pfds[1], F_SETFD, fcntl(pfds[1], F_GETFD) | FD_CLOEXEC);
 275         }
 276
 277         pipe_fd = fdopen(pfds[1], "w");
 278         return true;
 279 }
 280
 281 void
 282 fw3_pr(const char *fmt, ...)
 283 {
 284         va_list args;
 285
 286         if (fw3_pr_debug && pipe_fd != stdout)
 287         {
 288                 va_start(args, fmt);
 289                 vfprintf(stderr, fmt, args);
 290                 va_end(args);
 291         }
 292
 293         va_start(args, fmt);
 294         vfprintf(pipe_fd, fmt, args);
 295         va_end(args);
 296 }
 297
 298 void
 299 fw3_command_close(void)
 300 {
 301         if (pipe_fd && pipe_fd != stdout)
 302                 fclose(pipe_fd);
 303
 304         if (pipe_pid > -1)
 305                 waitpid(pipe_pid, NULL, 0);
 306
 307         signal(SIGPIPE, SIG_DFL);
 308
 309         pipe_fd = NULL;
 310         pipe_pid = -1;
 311 }
 312
 313 bool
 314 fw3_has_table(bool ipv6, const char *table)
 315 {
 316         FILE *f;
 317
 318         char line[12];
 319         bool seen = false;
 320
 321         const char *path = ipv6
 322                 ? "/proc/net/ip6_tables_names" : "/proc/net/ip_tables_names";
 323
 324         if (!(f = fopen(path, "r")))
 325                 return false;
 326
 327         while (fgets(line, sizeof(line), f))
 328         {
 329                 if (!strncmp(line, table, strlen(table)))
 330                 {
 331                         seen = true;
 332                         break;
 333                 }
 334         }
 335
 336         fclose(f);
 337
 338         return seen;
 339 }
 340
 341
 342 bool
 343 fw3_lock(void)
 344 {
 345         lock_fd = open(FW3_LOCKFILE, O_CREAT|O_WRONLY, S_IRUSR|S_IWUSR);
 346
 347         if (lock_fd < 0)
 348         {
 349                 warn("Cannot create lock file %s: %s", FW3_LOCKFILE, strerror(errno));
 350                 return false;
 351         }
 352
 353         if (flock(lock_fd, LOCK_EX))
 354         {
 355                 warn("Cannot acquire exclusive lock: %s", strerror(errno));
 356                 return false;
 357         }
 358
 359         return true;
 360 }
 361
 362 void
 363 fw3_unlock(void)
 364 {
 365         if (lock_fd < 0)
 366                 return;
 367
 368         if (flock(lock_fd, LOCK_UN))
 369                 warn("Cannot release exclusive lock: %s", strerror(errno));
 370
 371         close(lock_fd);
 372         unlink(FW3_LOCKFILE);
 373
 374         lock_fd = -1;
 375 }
 376
 377
 378 static void
 379 write_defaults_uci(struct uci_context *ctx, struct fw3_defaults *d,
 380                    struct uci_package *dest)
 381 {
 382         char buf[sizeof("0xffffffff\0")];
 383         struct uci_ptr ptr = { .p = dest };
 384
 385         uci_add_section(ctx, dest, "defaults", &ptr.s);
 386
 387         ptr.o      = NULL;
 388         ptr.option = "input";
 389         ptr.value  = fw3_flag_names[d->policy_input];
 390         uci_set(ctx, &ptr);
 391
 392         ptr.o      = NULL;
 393         ptr.option = "output";
 394         ptr.value  = fw3_flag_names[d->policy_output];
 395         uci_set(ctx, &ptr);
 396
 397         ptr.o      = NULL;
 398         ptr.option = "forward";
 399         ptr.value  = fw3_flag_names[d->policy_forward];
 400         uci_set(ctx, &ptr);
 401
 402         sprintf(buf, "0x%x", d->flags[0]);
 403         ptr.o      = NULL;
 404         ptr.option = "__flags_v4";
 405         ptr.value  = buf;
 406         uci_set(ctx, &ptr);
 407
 408         sprintf(buf, "0x%x", d->flags[1]);
 409         ptr.o      = NULL;
 410         ptr.option = "__flags_v6";
 411         ptr.value  = buf;
 412         uci_set(ctx, &ptr);
 413 }
 414
 415 static void
 416 write_zone_uci(struct uci_context *ctx, struct fw3_zone *z,
 417                struct uci_package *dest, struct ifaddrs *ifaddr)
 418 {
 419         struct fw3_device *dev;
 420         struct fw3_address *sub;
 421         struct ifaddrs *ifa;
 422         enum fw3_family fam = FW3_FAMILY_ANY;
 423
 424         char *p, buf[INET6_ADDRSTRLEN];
 425
 426         struct uci_ptr ptr = { .p = dest };
 427
 428         if (!z->enabled)
 429                 return;
 430
 431         if (fw3_no_table(z->flags[0]) && !fw3_no_table(z->flags[1]))
 432                 fam = FW3_FAMILY_V6;
 433         else if (!fw3_no_table(z->flags[0]) && fw3_no_table(z->flags[1]))
 434                 fam = FW3_FAMILY_V4;
 435         else if (fw3_no_table(z->flags[0]) && fw3_no_table(z->flags[1]))
 436                 return;
 437
 438         uci_add_section(ctx, dest, "zone", &ptr.s);
 439
 440         ptr.o      = NULL;
 441         ptr.option = "name";
 442         ptr.value  = z->name;
 443         uci_set(ctx, &ptr);
 444
 445         ptr.o      = NULL;
 446         ptr.option = "input";
 447         ptr.value  = fw3_flag_names[z->policy_input];
 448         uci_set(ctx, &ptr);
 449
 450         ptr.o      = NULL;
 451         ptr.option = "output";
 452         ptr.value  = fw3_flag_names[z->policy_output];
 453         uci_set(ctx, &ptr);
 454
 455         ptr.o      = NULL;
 456         ptr.option = "forward";
 457         ptr.value  = fw3_flag_names[z->policy_forward];
 458         uci_set(ctx, &ptr);
 459
 460         ptr.o      = NULL;
 461         ptr.option = "masq";
 462         ptr.value  = z->masq ? "1" : "0";
 463         uci_set(ctx, &ptr);
 464
 465         ptr.o      = NULL;
 466         ptr.option = "conntrack";
 467         ptr.value  = z->conntrack ? "1" : "0";
 468         uci_set(ctx, &ptr);
 469
 470         ptr.o      = NULL;
 471         ptr.option = "mtu_fix";
 472         ptr.value  = z->mtu_fix ? "1" : "0";
 473         uci_set(ctx, &ptr);
 474
 475         ptr.o      = NULL;
 476         ptr.option = "custom_chains";
 477         ptr.value  = z->custom_chains ? "1" : "0";
 478         uci_set(ctx, &ptr);
 479
 480         if (fam != FW3_FAMILY_ANY)
 481         {
 482                 ptr.o      = NULL;
 483                 ptr.option = "family";
 484                 ptr.value  = fw3_flag_names[fam];
 485                 uci_set(ctx, &ptr);
 486         }
 487
 488         ptr.o      = NULL;
 489         ptr.option = "device";
 490
 491         fw3_foreach(dev, &z->devices)
 492         {
 493                 if (!dev)
 494                         continue;
 495
 496                 p = buf;
 497
 498                 if (dev->invert)
 499                         p += sprintf(p, "!");
 500
 501                 if (*dev->network)
 502                         p += sprintf(p, "%s@%s", dev->name, dev->network);
 503                 else
 504                         p += sprintf(p, "%s", dev->name);
 505
 506                 ptr.value = buf;
 507                 uci_add_list(ctx, &ptr);
 508         }
 509
 510         ptr.o      = NULL;
 511         ptr.option = "subnet";
 512
 513         fw3_foreach(sub, &z->subnets)
 514         {
 515                 if (!sub)
 516                         continue;
 517
 518                 ptr.value = fw3_address_to_string(sub, true, false);
 519                 uci_add_list(ctx, &ptr);
 520         }
 521
 522         ptr.o      = NULL;
 523         ptr.option = "__addrs";
 524
 525         fw3_foreach(dev, &z->devices)
 526         {
 527                 if (!dev)
 528                         continue;
 529
 530                 for (ifa = ifaddr; ifa; ifa = ifa->ifa_next)
 531                 {
 532                         if (!ifa->ifa_addr || strcmp(dev->name, ifa->ifa_name))
 533                                 continue;
 534
 535                         if (ifa->ifa_addr->sa_family == AF_INET)
 536                                 inet_ntop(AF_INET,
 537                                           &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr,
 538                                           buf, sizeof(buf));
 539                         else if (ifa->ifa_addr->sa_family == AF_INET6)
 540                                 inet_ntop(AF_INET6,
 541                                           &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr,
 542                                           buf, sizeof(buf));
 543                         else
 544                                 continue;
 545
 546                         ptr.value = buf;
 547                         uci_add_list(ctx, &ptr);
 548                 }
 549         }
 550
 551         sprintf(buf, "0x%x", z->flags[0]);
 552         ptr.o      = NULL;
 553         ptr.option = "__flags_v4";
 554         ptr.value  = buf;
 555         uci_set(ctx, &ptr);
 556
 557         sprintf(buf, "0x%x", z->flags[1]);
 558         ptr.o      = NULL;
 559         ptr.option = "__flags_v6";
 560         ptr.value  = buf;
 561         uci_set(ctx, &ptr);
 562 }
 563
 564 static void
 565 write_ipset_uci(struct uci_context *ctx, struct fw3_ipset *s,
 566                 struct uci_package *dest)
 567 {
 568         struct fw3_ipset_datatype *type;
 569
 570         char buf[sizeof("65535-65535\0")];
 571
 572         struct uci_ptr ptr = { .p = dest };
 573
 574         if (!s->enabled || s->external)
 575                 return;
 576
 577         uci_add_section(ctx, dest, "ipset", &ptr.s);
 578
 579         ptr.o      = NULL;
 580         ptr.option = "name";
 581         ptr.value  = s->name;
 582         uci_set(ctx, &ptr);
 583
 584         ptr.o      = NULL;
 585         ptr.option = "storage";
 586         ptr.value  = fw3_ipset_method_names[s->method];
 587         uci_set(ctx, &ptr);
 588
 589         list_for_each_entry(type, &s->datatypes, list)
 590         {
 591                 sprintf(buf, "%s_%s", type->dir, fw3_ipset_type_names[type->type]);
 592                 ptr.o      = NULL;
 593                 ptr.option = "match";
 594                 ptr.value  = buf;
 595                 uci_add_list(ctx, &ptr);
 596         }
 597
 598         if (s->iprange.set)
 599         {
 600                 ptr.o      = NULL;
 601                 ptr.option = "iprange";
 602                 ptr.value  = fw3_address_to_string(&s->iprange, false, false);
 603                 uci_set(ctx, &ptr);
 604         }
 605
 606         if (s->portrange.set)
 607         {
 608                 sprintf(buf, "%u-%u", s->portrange.port_min, s->portrange.port_max);
 609                 ptr.o      = NULL;
 610                 ptr.option = "portrange";
 611                 ptr.value  = buf;
 612                 uci_set(ctx, &ptr);
 613         }
 614 }
 615
 616 void
 617 fw3_write_statefile(void *state)
 618 {
 619         FILE *sf;
 620         struct fw3_state *s = state;
 621         struct fw3_zone *z;
 622         struct fw3_ipset *i;
 623         struct ifaddrs *ifaddr;
 624
 625         struct uci_package *p;
 626
 627         if (fw3_no_family(s->defaults.flags[0]) &&
 628             fw3_no_family(s->defaults.flags[1]))
 629         {
 630                 unlink(FW3_STATEFILE);
 631         }
 632         else
 633         {
 634                 sf = fopen(FW3_STATEFILE, "w+");
 635
 636                 if (!sf)
 637                 {
 638                         warn("Cannot create state %s: %s", FW3_STATEFILE, strerror(errno));
 639                         return;
 640                 }
 641
 642                 if (getifaddrs(&ifaddr))
 643                 {
 644                         warn("Cannot get interface addresses: %s", strerror(errno));
 645                         ifaddr = NULL;
 646                 }
 647
 648                 if ((p = uci_lookup_package(s->uci, "fw3_state")) != NULL)
 649                         uci_unload(s->uci, p);
 650
 651                 uci_import(s->uci, sf, "fw3_state", NULL, true);
 652
 653                 if ((p = uci_lookup_package(s->uci, "fw3_state")) != NULL)
 654                 {
 655                         write_defaults_uci(s->uci, &s->defaults, p);
 656
 657                         list_for_each_entry(z, &s->zones, list)
 658                                 write_zone_uci(s->uci, z, p, ifaddr);
 659
 660                         list_for_each_entry(i, &s->ipsets, list)
 661                                 write_ipset_uci(s->uci, i, p);
 662
 663                         uci_export(s->uci, sf, p, true);
 664                         uci_unload(s->uci, p);
 665                 }
 666
 667                 fsync(fileno(sf));
 668                 fclose(sf);
 669
 670                 if (ifaddr)
 671                         freeifaddrs(ifaddr);
 672         }
 673 }
 674
 675
 676 void
 677 fw3_free_object(void *obj, const void *opts)
 678 {
 679         const struct fw3_option *ol;
 680         struct list_head *list, *cur, *tmp;
 681
 682         for (ol = opts; ol->name; ol++)
 683         {
 684                 if (!ol->elem_size)
 685                         continue;
 686
 687                 list = (struct list_head *)((char *)obj + ol->offset);
 688                 list_for_each_safe(cur, tmp, list)
 689                 {
 690                         list_del(cur);
 691                         free(cur);
 692                 }
 693         }
 694
 695         free(obj);
 696 }
 697
 698 void
 699 fw3_free_list(struct list_head *head)
 700 {
 701         struct list_head *entry, *tmp;
 702
 703         if (!head)
 704                 return;
 705
 706         list_for_each_safe(entry, tmp, head)
 707         {
 708                 list_del(entry);
 709                 free(entry);
 710         }
 711
 712         free(head);
 713 }
 714
 715 bool
 716 fw3_hotplug(bool add, void *zone, void *device)
 717 {
 718         struct fw3_zone *z = zone;
 719         struct fw3_device *d = device;
 720
 721         if (!*d->network)
 722                 return false;
 723
 724         switch (fork())
 725         {
 726         case -1:
 727                 warn("Unable to fork(): %s\n", strerror(errno));
 728                 return false;
 729
 730         case 0:
 731                 break;
 732
 733         default:
 734                 return true;
 735         }
 736
 737         close(0);
 738         close(1);
 739         close(2);
 740         if (chdir("/")) {};
 741
 742         clearenv();
 743         setenv("ACTION",    add ? "add" : "remove", 1);
 744         setenv("ZONE",      z->name,                1);
 745         setenv("INTERFACE", d->network,             1);
 746         setenv("DEVICE",    d->name,                1);
 747
 748         execl(FW3_HOTPLUG, FW3_HOTPLUG, "firewall", NULL);
 749
 750         /* unreached */
 751         return false;
 752 }
 753
 754 int
 755 fw3_netmask2bitlen(int family, void *mask)
 756 {
 757         int bits;
 758         struct in_addr *v4;
 759         struct in6_addr *v6;
 760
 761         if (family == FW3_FAMILY_V6)
 762                 for (bits = 0, v6 = mask;
 763                      bits < 128 && (v6->s6_addr[bits / 8] << (bits % 8)) & 128;
 764                      bits++);
 765         else
 766                 for (bits = 0, v4 = mask;
 767                      bits < 32 && (ntohl(v4->s_addr) << bits) & 0x80000000;
 768                      bits++);
 769
 770         return bits;
 771 }
 772
 773 bool
 774 fw3_bitlen2netmask(int family, int bits, void *mask)
 775 {
 776         int i;
 777         uint8_t rem, b;
 778         struct in_addr *v4;
 779         struct in6_addr *v6;
 780
 781         if (family == FW3_FAMILY_V6)
 782         {
 783                 if (bits < -128 || bits > 128)
 784                         return false;
 785
 786                 v6 = mask;
 787                 rem = abs(bits);
 788
 789                 for (i = 0; i < sizeof(v6->s6_addr); i++)
 790                 {
 791                         b = (rem > 8) ? 8 : rem;
 792                         v6->s6_addr[i] = (uint8_t)(0xFF << (8 - b));
 793                         rem -= b;
 794                 }
 795
 796                 if (bits < 0)
 797                         for (i = 0; i < sizeof(v6->s6_addr); i++)
 798                                 v6->s6_addr[i] = ~v6->s6_addr[i];
 799         }
 800         else
 801         {
 802                 if (bits < -32 || bits > 32)
 803                         return false;
 804
 805                 v4 = mask;
 806                 v4->s_addr = bits ? htonl(~((1 << (32 - abs(bits))) - 1)) : 0;
 807
 808                 if (bits < 0)
 809                         v4->s_addr = ~v4->s_addr;
 810         }
 811
 812         return true;
 813 }
 814
 815 void
 816 fw3_flush_conntrack(void *state)
 817 {
 818         bool found;
 819         struct fw3_state *s = state;
 820         struct fw3_address *addr;
 821         struct fw3_device *dev;
 822         struct fw3_zone *zone;
 823         struct ifaddrs *ifaddr, *ifa;
 824         struct sockaddr_in *sin;
 825         struct sockaddr_in6 *sin6;
 826         char buf[INET6_ADDRSTRLEN];
 827         FILE *ct;
 828
 829         if (!state)
 830         {
 831                 if ((ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
 832                 {
 833                         info(" * Flushing conntrack table ...");
 834
 835                         fwrite("f\n", 1, 2, ct);
 836                         fclose(ct);
 837                 }
 838
 839                 return;
 840         }
 841
 842         if (getifaddrs(&ifaddr))
 843         {
 844                 warn("Cannot get interface addresses: %s", strerror(errno));
 845                 return;
 846         }
 847
 848         if ((ct = fopen("/proc/net/nf_conntrack", "w")) != NULL)
 849         {
 850                 list_for_each_entry(zone, &s->zones, list)
 851                 list_for_each_entry(addr, &zone->old_addrs, list)
 852                 {
 853                         found = false;
 854
 855                         list_for_each_entry(dev, &zone->devices, list)
 856                         {
 857                                 for (ifa = ifaddr; ifa && !found; ifa = ifa->ifa_next)
 858                                 {
 859                                         if (!ifa->ifa_addr || strcmp(dev->name, ifa->ifa_name))
 860                                                 continue;
 861
 862                                         sin = (struct sockaddr_in *)ifa->ifa_addr;
 863                                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 864
 865                                         if (addr->family == FW3_FAMILY_V4 &&
 866                                                 sin->sin_family == AF_INET)
 867                                         {
 868                                                 found = !memcmp(&addr->address.v4, &sin->sin_addr,
 869                                                                                 sizeof(sin->sin_addr));
 870                                         }
 871                                         else if (addr->family == FW3_FAMILY_V6 &&
 872                                                          sin6->sin6_family == AF_INET6)
 873                                         {
 874                                                 found = !memcmp(&addr->address.v6, &sin6->sin6_addr,
 875                                                                                 sizeof(sin6->sin6_addr));
 876                                         }
 877                                 }
 878
 879                                 if (found)
 880                                         break;
 881                         }
 882
 883                         if (!found)
 884                         {
 885                                 inet_ntop(addr->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 886                                                   &addr->address.v4, buf, sizeof(buf));
 887
 888                                 info(" * Flushing conntrack: %s", buf);
 889                                 fprintf(ct, "%s\n", buf);
 890                         }
 891                 }
 892
 893                 fclose(ct);
 894         }
 895
 896         freeifaddrs(ifaddr);
 897 }