ip/iprule.c

   1 /*
   2  * iprule.c             "ip rule".
   3  *
   4  *              This program is free software; you can redistribute it and/or
   5  *              modify it under the terms of the GNU General Public License
   6  *              as published by the Free Software Foundation; either version
   7  *              2 of the License, or (at your option) any later version.
   8  *
   9  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  10  *
  11  */
  12
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <sys/socket.h>
  19 #include <netinet/in.h>
  20 #include <netinet/ip.h>
  21 #include <arpa/inet.h>
  22 #include <string.h>
  23 #include <linux/fib_rules.h>
  24 #include <errno.h>
  25
  26 #include "rt_names.h"
  27 #include "utils.h"
  28 #include "ip_common.h"
  29
  30 extern struct rtnl_handle rth;
  31
  32 static void usage(void) __attribute__((noreturn));
  33
  34 static void usage(void)
  35 {
  36         fprintf(stderr, "Usage: ip rule { add | del } SELECTOR ACTION\n");
  37         fprintf(stderr, "       ip rule { flush | save | restore }\n");
  38         fprintf(stderr, "       ip rule [ list ]\n");
  39         fprintf(stderr, "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n");
  40         fprintf(stderr, "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n");
  41         fprintf(stderr, "ACTION := [ table TABLE_ID ]\n");
  42         fprintf(stderr, "          [ nat ADDRESS ]\n");
  43         fprintf(stderr, "          [ realms [SRCREALM/]DSTREALM ]\n");
  44         fprintf(stderr, "          [ goto NUMBER ]\n");
  45         fprintf(stderr, "          SUPPRESSOR\n");
  46         fprintf(stderr, "SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n");
  47         fprintf(stderr, "              [ suppress_ifgroup DEVGROUP ]\n");
  48         fprintf(stderr, "TABLE_ID := [ local | main | default | NUMBER ]\n");
  49         exit(-1);
  50 }
  51
  52 int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  53 {
  54         FILE *fp = (FILE *)arg;
  55         struct rtmsg *r = NLMSG_DATA(n);
  56         int len = n->nlmsg_len;
  57         int host_len = -1;
  58         __u32 table;
  59         struct rtattr *tb[FRA_MAX+1];
  60
  61         SPRINT_BUF(b1);
  62
  63         if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
  64                 return 0;
  65
  66         len -= NLMSG_LENGTH(sizeof(*r));
  67         if (len < 0)
  68                 return -1;
  69
  70         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
  71
  72         host_len = af_bit_len(r->rtm_family);
  73
  74         if (n->nlmsg_type == RTM_DELRULE)
  75                 fprintf(fp, "Deleted ");
  76
  77         if (tb[FRA_PRIORITY])
  78                 fprintf(fp, "%u:\t",
  79                         rta_getattr_u32(tb[FRA_PRIORITY]));
  80         else
  81                 fprintf(fp, "0:\t");
  82
  83         if (r->rtm_flags & FIB_RULE_INVERT)
  84                 fprintf(fp, "not ");
  85
  86         if (tb[FRA_SRC]) {
  87                 if (r->rtm_src_len != host_len) {
  88                         fprintf(fp, "from %s/%u ",
  89                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_SRC]),
  90                                 r->rtm_src_len);
  91                 } else {
  92                         fprintf(fp, "from %s ",
  93                                 format_host_rta(r->rtm_family, tb[FRA_SRC]));
  94                 }
  95         } else if (r->rtm_src_len) {
  96                 fprintf(fp, "from 0/%d ", r->rtm_src_len);
  97         } else {
  98                 fprintf(fp, "from all ");
  99         }
 100
 101         if (tb[FRA_DST]) {
 102                 if (r->rtm_dst_len != host_len) {
 103                         fprintf(fp, "to %s/%u ",
 104                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_DST]),
 105                                 r->rtm_dst_len);
 106                 } else {
 107                         fprintf(fp, "to %s ",
 108                                 format_host_rta(r->rtm_family, tb[FRA_DST]));
 109                 }
 110         } else if (r->rtm_dst_len) {
 111                 fprintf(fp, "to 0/%d ", r->rtm_dst_len);
 112         }
 113
 114         if (r->rtm_tos) {
 115                 SPRINT_BUF(b1);
 116                 fprintf(fp, "tos %s ",
 117                         rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 118         }
 119
 120         if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
 121                 __u32 mark = 0, mask = 0;
 122
 123                 if (tb[FRA_FWMARK])
 124                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 125
 126                 if (tb[FRA_FWMASK] &&
 127                     (mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
 128                         fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
 129                 else
 130                         fprintf(fp, "fwmark 0x%x ", mark);
 131         }
 132
 133         if (tb[FRA_IFNAME]) {
 134                 fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
 135                 if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
 136                         fprintf(fp, "[detached] ");
 137         }
 138
 139         if (tb[FRA_OIFNAME]) {
 140                 fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
 141                 if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
 142                         fprintf(fp, "[detached] ");
 143         }
 144
 145         if (tb[FRA_L3MDEV]) {
 146                 if (rta_getattr_u8(tb[FRA_L3MDEV]))
 147                         fprintf(fp, "lookup [l3mdev-table] ");
 148         }
 149
 150         table = rtm_get_table(r, tb);
 151         if (table) {
 152                 fprintf(fp, "lookup %s ",
 153                         rtnl_rttable_n2a(table, b1, sizeof(b1)));
 154
 155                 if (tb[FRA_SUPPRESS_PREFIXLEN]) {
 156                         int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
 157
 158                         if (pl != -1)
 159                                 fprintf(fp, "suppress_prefixlength %d ", pl);
 160                 }
 161                 if (tb[FRA_SUPPRESS_IFGROUP]) {
 162                         int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
 163
 164                         if (group != -1) {
 165                                 SPRINT_BUF(b1);
 166                                 fprintf(fp, "suppress_ifgroup %s ",
 167                                         rtnl_group_n2a(group, b1, sizeof(b1)));
 168                         }
 169                 }
 170         }
 171
 172         if (tb[FRA_FLOW]) {
 173                 __u32 to = rta_getattr_u32(tb[FRA_FLOW]);
 174                 __u32 from = to>>16;
 175
 176                 to &= 0xFFFF;
 177                 if (from) {
 178                         fprintf(fp, "realms %s/",
 179                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 180                 }
 181                 fprintf(fp, "%s ",
 182                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 183         }
 184
 185         if (r->rtm_type == RTN_NAT) {
 186                 if (tb[RTA_GATEWAY]) {
 187                         fprintf(fp, "map-to %s ",
 188                                 format_host_rta(r->rtm_family,
 189                                                 tb[RTA_GATEWAY]));
 190                 } else
 191                         fprintf(fp, "masquerade");
 192         } else if (r->rtm_type == FR_ACT_GOTO) {
 193                 fprintf(fp, "goto ");
 194                 if (tb[FRA_GOTO])
 195                         fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
 196                 else
 197                         fprintf(fp, "none");
 198                 if (r->rtm_flags & FIB_RULE_UNRESOLVED)
 199                         fprintf(fp, " [unresolved]");
 200         } else if (r->rtm_type == FR_ACT_NOP)
 201                 fprintf(fp, "nop");
 202         else if (r->rtm_type != RTN_UNICAST)
 203                 fprintf(fp, "%s",
 204                         rtnl_rtntype_n2a(r->rtm_type,
 205                                          b1, sizeof(b1)));
 206
 207         fprintf(fp, "\n");
 208         fflush(fp);
 209         return 0;
 210 }
 211
 212 static __u32 rule_dump_magic = 0x71706986;
 213
 214 static int save_rule_prep(void)
 215 {
 216         int ret;
 217
 218         if (isatty(STDOUT_FILENO)) {
 219                 fprintf(stderr, "Not sending a binary stream to stdout\n");
 220                 return -1;
 221         }
 222
 223         ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
 224         if (ret != sizeof(rule_dump_magic)) {
 225                 fprintf(stderr, "Can't write magic to dump file\n");
 226                 return -1;
 227         }
 228
 229         return 0;
 230 }
 231
 232 static int save_rule(const struct sockaddr_nl *who,
 233                      struct nlmsghdr *n, void *arg)
 234 {
 235         int ret;
 236
 237         ret = write(STDOUT_FILENO, n, n->nlmsg_len);
 238         if ((ret > 0) && (ret != n->nlmsg_len)) {
 239                 fprintf(stderr, "Short write while saving nlmsg\n");
 240                 ret = -EIO;
 241         }
 242
 243         return ret == n->nlmsg_len ? 0 : ret;
 244 }
 245
 246 static int iprule_list_or_save(int argc, char **argv, int save)
 247 {
 248         rtnl_filter_t filter = print_rule;
 249         int af = preferred_family;
 250
 251         if (af == AF_UNSPEC)
 252                 af = AF_INET;
 253
 254         if (argc > 0) {
 255                 fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
 256                                 save ? "save" : "show");
 257                 return -1;
 258         }
 259
 260         if (save) {
 261                 if (save_rule_prep())
 262                         return -1;
 263                 filter = save_rule;
 264         }
 265
 266         if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
 267                 perror("Cannot send dump request");
 268                 return 1;
 269         }
 270
 271         if (rtnl_dump_filter(&rth, filter, stdout) < 0) {
 272                 fprintf(stderr, "Dump terminated\n");
 273                 return 1;
 274         }
 275
 276         return 0;
 277 }
 278
 279 static int rule_dump_check_magic(void)
 280 {
 281         int ret;
 282         __u32 magic = 0;
 283
 284         if (isatty(STDIN_FILENO)) {
 285                 fprintf(stderr, "Can't restore rule dump from a terminal\n");
 286                 return -1;
 287         }
 288
 289         ret = fread(&magic, sizeof(magic), 1, stdin);
 290         if (magic != rule_dump_magic) {
 291                 fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n",
 292                         ret, magic);
 293                 return -1;
 294         }
 295
 296         return 0;
 297 }
 298
 299 static int restore_handler(const struct sockaddr_nl *nl,
 300                            struct rtnl_ctrl_data *ctrl,
 301                            struct nlmsghdr *n, void *arg)
 302 {
 303         int ret;
 304
 305         n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
 306
 307         ll_init_map(&rth);
 308
 309         ret = rtnl_talk(&rth, n, n, sizeof(*n));
 310         if ((ret < 0) && (errno == EEXIST))
 311                 ret = 0;
 312
 313         return ret;
 314 }
 315
 316
 317 static int iprule_restore(void)
 318 {
 319         if (rule_dump_check_magic())
 320                 exit(-1);
 321
 322         exit(rtnl_from_file(stdin, &restore_handler, NULL));
 323 }
 324
 325 static int iprule_modify(int cmd, int argc, char **argv)
 326 {
 327         int l3mdev_rule = 0;
 328         int table_ok = 0;
 329         __u32 tid = 0;
 330         struct {
 331                 struct nlmsghdr n;
 332                 struct rtmsg            r;
 333                 char                    buf[1024];
 334         } req;
 335
 336         memset(&req, 0, sizeof(req));
 337
 338         req.n.nlmsg_type = cmd;
 339         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 340         req.n.nlmsg_flags = NLM_F_REQUEST;
 341         req.r.rtm_family = preferred_family;
 342         req.r.rtm_protocol = RTPROT_BOOT;
 343         req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 344         req.r.rtm_table = 0;
 345         req.r.rtm_type = RTN_UNSPEC;
 346         req.r.rtm_flags = 0;
 347
 348         if (cmd == RTM_NEWRULE) {
 349                 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
 350                 req.r.rtm_type = RTN_UNICAST;
 351         }
 352
 353         while (argc > 0) {
 354                 if (strcmp(*argv, "not") == 0) {
 355                         req.r.rtm_flags |= FIB_RULE_INVERT;
 356                 } else if (strcmp(*argv, "from") == 0) {
 357                         inet_prefix dst;
 358
 359                         NEXT_ARG();
 360                         get_prefix(&dst, *argv, req.r.rtm_family);
 361                         req.r.rtm_src_len = dst.bitlen;
 362                         addattr_l(&req.n, sizeof(req), FRA_SRC,
 363                                   &dst.data, dst.bytelen);
 364                 } else if (strcmp(*argv, "to") == 0) {
 365                         inet_prefix dst;
 366
 367                         NEXT_ARG();
 368                         get_prefix(&dst, *argv, req.r.rtm_family);
 369                         req.r.rtm_dst_len = dst.bitlen;
 370                         addattr_l(&req.n, sizeof(req), FRA_DST,
 371                                   &dst.data, dst.bytelen);
 372                 } else if (matches(*argv, "preference") == 0 ||
 373                            matches(*argv, "order") == 0 ||
 374                            matches(*argv, "priority") == 0) {
 375                         __u32 pref;
 376
 377                         NEXT_ARG();
 378                         if (get_u32(&pref, *argv, 0))
 379                                 invarg("preference value is invalid\n", *argv);
 380                         addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
 381                 } else if (strcmp(*argv, "tos") == 0 ||
 382                            matches(*argv, "dsfield") == 0) {
 383                         __u32 tos;
 384
 385                         NEXT_ARG();
 386                         if (rtnl_dsfield_a2n(&tos, *argv))
 387                                 invarg("TOS value is invalid\n", *argv);
 388                         req.r.rtm_tos = tos;
 389                 } else if (strcmp(*argv, "fwmark") == 0) {
 390                         char *slash;
 391                         __u32 fwmark, fwmask;
 392
 393                         NEXT_ARG();
 394
 395                         slash = strchr(*argv, '/');
 396                         if (slash != NULL)
 397                                 *slash = '\0';
 398                         if (get_u32(&fwmark, *argv, 0))
 399                                 invarg("fwmark value is invalid\n", *argv);
 400                         addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
 401                         if (slash) {
 402                                 if (get_u32(&fwmask, slash+1, 0))
 403                                         invarg("fwmask value is invalid\n",
 404                                                slash+1);
 405                                 addattr32(&req.n, sizeof(req),
 406                                           FRA_FWMASK, fwmask);
 407                         }
 408                 } else if (matches(*argv, "realms") == 0) {
 409                         __u32 realm;
 410
 411                         NEXT_ARG();
 412                         if (get_rt_realms_or_raw(&realm, *argv))
 413                                 invarg("invalid realms\n", *argv);
 414                         addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
 415                 } else if (matches(*argv, "table") == 0 ||
 416                            strcmp(*argv, "lookup") == 0) {
 417                         NEXT_ARG();
 418                         if (rtnl_rttable_a2n(&tid, *argv))
 419                                 invarg("invalid table ID\n", *argv);
 420                         if (tid < 256)
 421                                 req.r.rtm_table = tid;
 422                         else {
 423                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 424                                 addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
 425                         }
 426                         table_ok = 1;
 427                 } else if (matches(*argv, "suppress_prefixlength") == 0 ||
 428                            strcmp(*argv, "sup_pl") == 0) {
 429                         int pl;
 430
 431                         NEXT_ARG();
 432                         if (get_s32(&pl, *argv, 0) || pl < 0)
 433                                 invarg("suppress_prefixlength value is invalid\n",
 434                                        *argv);
 435                         addattr32(&req.n, sizeof(req),
 436                                   FRA_SUPPRESS_PREFIXLEN, pl);
 437                 } else if (matches(*argv, "suppress_ifgroup") == 0 ||
 438                            strcmp(*argv, "sup_group") == 0) {
 439                         NEXT_ARG();
 440                         int group;
 441
 442                         if (rtnl_group_a2n(&group, *argv))
 443                                 invarg("Invalid \"suppress_ifgroup\" value\n",
 444                                        *argv);
 445                         addattr32(&req.n, sizeof(req),
 446                                   FRA_SUPPRESS_IFGROUP, group);
 447                 } else if (strcmp(*argv, "dev") == 0 ||
 448                            strcmp(*argv, "iif") == 0) {
 449                         NEXT_ARG();
 450                         addattr_l(&req.n, sizeof(req), FRA_IFNAME,
 451                                   *argv, strlen(*argv)+1);
 452                 } else if (strcmp(*argv, "oif") == 0) {
 453                         NEXT_ARG();
 454                         addattr_l(&req.n, sizeof(req), FRA_OIFNAME,
 455                                   *argv, strlen(*argv)+1);
 456                 } else if (strcmp(*argv, "l3mdev") == 0) {
 457                         addattr8(&req.n, sizeof(req), FRA_L3MDEV, 1);
 458                         table_ok = 1;
 459                         l3mdev_rule = 1;
 460                 } else if (strcmp(*argv, "nat") == 0 ||
 461                            matches(*argv, "map-to") == 0) {
 462                         NEXT_ARG();
 463                         fprintf(stderr, "Warning: route NAT is deprecated\n");
 464                         addattr32(&req.n, sizeof(req), RTA_GATEWAY,
 465                                   get_addr32(*argv));
 466                         req.r.rtm_type = RTN_NAT;
 467                 } else {
 468                         int type;
 469
 470                         if (strcmp(*argv, "type") == 0)
 471                                 NEXT_ARG();
 472
 473                         if (matches(*argv, "help") == 0)
 474                                 usage();
 475                         else if (matches(*argv, "goto") == 0) {
 476                                 __u32 target;
 477
 478                                 type = FR_ACT_GOTO;
 479                                 NEXT_ARG();
 480                                 if (get_u32(&target, *argv, 0))
 481                                         invarg("invalid target\n", *argv);
 482                                 addattr32(&req.n, sizeof(req),
 483                                           FRA_GOTO, target);
 484                         } else if (matches(*argv, "nop") == 0)
 485                                 type = FR_ACT_NOP;
 486                         else if (rtnl_rtntype_a2n(&type, *argv))
 487                                 invarg("Failed to parse rule type", *argv);
 488                         req.r.rtm_type = type;
 489                         table_ok = 1;
 490                 }
 491                 argc--;
 492                 argv++;
 493         }
 494
 495         if (l3mdev_rule && tid != 0) {
 496                 fprintf(stderr,
 497                         "table can not be specified for l3mdev rules\n");
 498                 return -EINVAL;
 499         }
 500
 501         if (req.r.rtm_family == AF_UNSPEC)
 502                 req.r.rtm_family = AF_INET;
 503
 504         if (!table_ok && cmd == RTM_NEWRULE)
 505                 req.r.rtm_table = RT_TABLE_MAIN;
 506
 507         if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
 508                 return -2;
 509
 510         return 0;
 511 }
 512
 513
 514 static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n,
 515                       void *arg)
 516 {
 517         struct rtnl_handle rth2;
 518         struct rtmsg *r = NLMSG_DATA(n);
 519         int len = n->nlmsg_len;
 520         struct rtattr *tb[FRA_MAX+1];
 521
 522         len -= NLMSG_LENGTH(sizeof(*r));
 523         if (len < 0)
 524                 return -1;
 525
 526         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 527
 528         if (tb[FRA_PRIORITY]) {
 529                 n->nlmsg_type = RTM_DELRULE;
 530                 n->nlmsg_flags = NLM_F_REQUEST;
 531
 532                 if (rtnl_open(&rth2, 0) < 0)
 533                         return -1;
 534
 535                 if (rtnl_talk(&rth2, n, NULL, 0) < 0)
 536                         return -2;
 537
 538                 rtnl_close(&rth2);
 539         }
 540
 541         return 0;
 542 }
 543
 544 static int iprule_flush(int argc, char **argv)
 545 {
 546         int af = preferred_family;
 547
 548         if (af == AF_UNSPEC)
 549                 af = AF_INET;
 550
 551         if (argc > 0) {
 552                 fprintf(stderr, "\"ip rule flush\" does not allow arguments\n");
 553                 return -1;
 554         }
 555
 556         if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
 557                 perror("Cannot send dump request");
 558                 return 1;
 559         }
 560
 561         if (rtnl_dump_filter(&rth, flush_rule, NULL) < 0) {
 562                 fprintf(stderr, "Flush terminated\n");
 563                 return 1;
 564         }
 565
 566         return 0;
 567 }
 568
 569 int do_iprule(int argc, char **argv)
 570 {
 571         if (argc < 1) {
 572                 return iprule_list_or_save(0, NULL, 0);
 573         } else if (matches(argv[0], "list") == 0 ||
 574                    matches(argv[0], "lst") == 0 ||
 575                    matches(argv[0], "show") == 0) {
 576                 return iprule_list_or_save(argc-1, argv+1, 0);
 577         } else if (matches(argv[0], "save") == 0) {
 578                 return iprule_list_or_save(argc-1, argv+1, 1);
 579         } else if (matches(argv[0], "restore") == 0) {
 580                 return iprule_restore();
 581         } else if (matches(argv[0], "add") == 0) {
 582                 return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
 583         } else if (matches(argv[0], "delete") == 0) {
 584                 return iprule_modify(RTM_DELRULE, argc-1, argv+1);
 585         } else if (matches(argv[0], "flush") == 0) {
 586                 return iprule_flush(argc-1, argv+1);
 587         } else if (matches(argv[0], "help") == 0)
 588                 usage();
 589
 590         fprintf(stderr,
 591                 "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
 592         exit(-1);
 593 }
 594
 595 int do_multirule(int argc, char **argv)
 596 {
 597         switch (preferred_family) {
 598         case AF_UNSPEC:
 599         case AF_INET:
 600                 preferred_family = RTNL_FAMILY_IPMR;
 601                 break;
 602         case AF_INET6:
 603                 preferred_family = RTNL_FAMILY_IP6MR;
 604                 break;
 605         case RTNL_FAMILY_IPMR:
 606         case RTNL_FAMILY_IP6MR:
 607                 break;
 608         default:
 609                 fprintf(stderr,
 610                         "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
 611                         preferred_family);
 612                 exit(-1);
 613         }
 614
 615         return do_iprule(argc, argv);
 616 }