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 <fcntl.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <netinet/ip.h>
  20 #include <arpa/inet.h>
  21 #include <string.h>
  22 #include <linux/if.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 enum list_action {
  31         IPRULE_LIST,
  32         IPRULE_FLUSH,
  33         IPRULE_SAVE,
  34 };
  35
  36 extern struct rtnl_handle rth;
  37
  38 static void usage(void) __attribute__((noreturn));
  39
  40 static void usage(void)
  41 {
  42         fprintf(stderr,
  43                 "Usage: ip rule { add | del } SELECTOR ACTION\n"
  44                 "       ip rule { flush | save | restore }\n"
  45                 "       ip rule [ list [ SELECTOR ]]\n"
  46                 "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n"
  47                 "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n"
  48                 "            [ uidrange NUMBER-NUMBER ]\n"
  49                 "ACTION := [ table TABLE_ID ]\n"
  50                 "          [ nat ADDRESS ]\n"
  51                 "          [ realms [SRCREALM/]DSTREALM ]\n"
  52                 "          [ goto NUMBER ]\n"
  53                 "          SUPPRESSOR\n"
  54                 "SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n"
  55                 "              [ suppress_ifgroup DEVGROUP ]\n"
  56                 "TABLE_ID := [ local | main | default | NUMBER ]\n");
  57         exit(-1);
  58 }
  59
  60 static struct
  61 {
  62         int not;
  63         int l3mdev;
  64         int iifmask, oifmask, uidrange;
  65         unsigned int tb;
  66         unsigned int tos, tosmask;
  67         unsigned int pref, prefmask;
  68         unsigned int fwmark, fwmask;
  69         char iif[IFNAMSIZ];
  70         char oif[IFNAMSIZ];
  71         struct fib_rule_uid_range range;
  72         inet_prefix src;
  73         inet_prefix dst;
  74 } filter;
  75
  76 static bool filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
  77 {
  78         struct rtmsg *r = NLMSG_DATA(n);
  79         inet_prefix src = { .family = r->rtm_family };
  80         inet_prefix dst = { .family = r->rtm_family };
  81         __u32 table;
  82
  83         if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
  84                 return false;
  85
  86         if (filter.prefmask &&
  87             filter.pref ^ (tb[FRA_PRIORITY] ? rta_getattr_u32(tb[FRA_PRIORITY]) : 0))
  88                 return false;
  89         if (filter.not && !(r->rtm_flags & FIB_RULE_INVERT))
  90                 return false;
  91
  92         if (filter.src.family) {
  93                 if (tb[FRA_SRC]) {
  94                         memcpy(&src.data, RTA_DATA(tb[FRA_SRC]),
  95                                (r->rtm_src_len + 7) / 8);
  96                 }
  97                 if (filter.src.family != r->rtm_family ||
  98                     filter.src.bitlen > r->rtm_src_len ||
  99                     inet_addr_match(&src, &filter.src, filter.src.bitlen))
 100                         return false;
 101         }
 102
 103         if (filter.dst.family) {
 104                 if (tb[FRA_DST]) {
 105                         memcpy(&dst.data, RTA_DATA(tb[FRA_DST]),
 106                                (r->rtm_dst_len + 7) / 8);
 107                 }
 108                 if (filter.dst.family != r->rtm_family ||
 109                     filter.dst.bitlen > r->rtm_dst_len ||
 110                     inet_addr_match(&dst, &filter.dst, filter.dst.bitlen))
 111                         return false;
 112         }
 113
 114         if (filter.tosmask && filter.tos ^ r->rtm_tos)
 115                 return false;
 116
 117         if (filter.fwmark) {
 118                 __u32 mark = 0;
 119
 120                 if (tb[FRA_FWMARK])
 121                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 122                 if (filter.fwmark ^ mark)
 123                         return false;
 124         }
 125         if (filter.fwmask) {
 126                 __u32 mask = 0;
 127
 128                 if (tb[FRA_FWMASK])
 129                         mask = rta_getattr_u32(tb[FRA_FWMASK]);
 130                 if (filter.fwmask ^ mask)
 131                         return false;
 132         }
 133
 134         if (filter.iifmask) {
 135                 if (tb[FRA_IFNAME]) {
 136                         if (strcmp(filter.iif, rta_getattr_str(tb[FRA_IFNAME])) != 0)
 137                                 return false;
 138                 } else {
 139                         return false;
 140                 }
 141         }
 142
 143         if (filter.oifmask) {
 144                 if (tb[FRA_OIFNAME]) {
 145                         if (strcmp(filter.oif, rta_getattr_str(tb[FRA_OIFNAME])) != 0)
 146                                 return false;
 147                 } else {
 148                         return false;
 149                 }
 150         }
 151
 152         if (filter.l3mdev && !(tb[FRA_L3MDEV] && rta_getattr_u8(tb[FRA_L3MDEV])))
 153                 return false;
 154
 155         if (filter.uidrange) {
 156                 struct fib_rule_uid_range *r = RTA_DATA(tb[FRA_UID_RANGE]);
 157
 158                 if (!tb[FRA_UID_RANGE] ||
 159                     r->start != filter.range.start ||
 160                     r->end != filter.range.end)
 161                         return false;
 162         }
 163
 164         table = rtm_get_table(r, tb);
 165         if (filter.tb > 0 && filter.tb ^ table)
 166                 return false;
 167
 168         return true;
 169 }
 170
 171 int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 172 {
 173         FILE *fp = (FILE *)arg;
 174         struct rtmsg *r = NLMSG_DATA(n);
 175         int len = n->nlmsg_len;
 176         int host_len = -1;
 177         __u32 table;
 178         struct rtattr *tb[FRA_MAX+1];
 179
 180         SPRINT_BUF(b1);
 181
 182         if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
 183                 return 0;
 184
 185         len -= NLMSG_LENGTH(sizeof(*r));
 186         if (len < 0)
 187                 return -1;
 188
 189         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 190
 191         host_len = af_bit_len(r->rtm_family);
 192
 193         if (!filter_nlmsg(n, tb, host_len))
 194                 return 0;
 195
 196         if (n->nlmsg_type == RTM_DELRULE)
 197                 fprintf(fp, "Deleted ");
 198
 199         if (tb[FRA_PRIORITY])
 200                 fprintf(fp, "%u:\t",
 201                         rta_getattr_u32(tb[FRA_PRIORITY]));
 202         else
 203                 fprintf(fp, "0:\t");
 204
 205         if (r->rtm_flags & FIB_RULE_INVERT)
 206                 fprintf(fp, "not ");
 207
 208         if (tb[FRA_SRC]) {
 209                 if (r->rtm_src_len != host_len) {
 210                         fprintf(fp, "from %s/%u ",
 211                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_SRC]),
 212                                 r->rtm_src_len);
 213                 } else {
 214                         fprintf(fp, "from %s ",
 215                                 format_host_rta(r->rtm_family, tb[FRA_SRC]));
 216                 }
 217         } else if (r->rtm_src_len) {
 218                 fprintf(fp, "from 0/%d ", r->rtm_src_len);
 219         } else {
 220                 fprintf(fp, "from all ");
 221         }
 222
 223         if (tb[FRA_DST]) {
 224                 if (r->rtm_dst_len != host_len) {
 225                         fprintf(fp, "to %s/%u ",
 226                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_DST]),
 227                                 r->rtm_dst_len);
 228                 } else {
 229                         fprintf(fp, "to %s ",
 230                                 format_host_rta(r->rtm_family, tb[FRA_DST]));
 231                 }
 232         } else if (r->rtm_dst_len) {
 233                 fprintf(fp, "to 0/%d ", r->rtm_dst_len);
 234         }
 235
 236         if (r->rtm_tos) {
 237                 SPRINT_BUF(b1);
 238                 fprintf(fp, "tos %s ",
 239                         rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 240         }
 241
 242         if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
 243                 __u32 mark = 0, mask = 0;
 244
 245                 if (tb[FRA_FWMARK])
 246                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 247
 248                 if (tb[FRA_FWMASK] &&
 249                     (mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
 250                         fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
 251                 else
 252                         fprintf(fp, "fwmark 0x%x ", mark);
 253         }
 254
 255         if (tb[FRA_IFNAME]) {
 256                 fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
 257                 if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
 258                         fprintf(fp, "[detached] ");
 259         }
 260
 261         if (tb[FRA_OIFNAME]) {
 262                 fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
 263                 if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
 264                         fprintf(fp, "[detached] ");
 265         }
 266
 267         if (tb[FRA_L3MDEV]) {
 268                 if (rta_getattr_u8(tb[FRA_L3MDEV]))
 269                         fprintf(fp, "lookup [l3mdev-table] ");
 270         }
 271
 272         if (tb[FRA_UID_RANGE]) {
 273                 struct fib_rule_uid_range *r = RTA_DATA(tb[FRA_UID_RANGE]);
 274
 275                 fprintf(fp, "uidrange %u-%u ", r->start, r->end);
 276         }
 277
 278         table = rtm_get_table(r, tb);
 279         if (table) {
 280                 fprintf(fp, "lookup %s ",
 281                         rtnl_rttable_n2a(table, b1, sizeof(b1)));
 282
 283                 if (tb[FRA_SUPPRESS_PREFIXLEN]) {
 284                         int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
 285
 286                         if (pl != -1)
 287                                 fprintf(fp, "suppress_prefixlength %d ", pl);
 288                 }
 289                 if (tb[FRA_SUPPRESS_IFGROUP]) {
 290                         int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
 291
 292                         if (group != -1) {
 293                                 SPRINT_BUF(b1);
 294                                 fprintf(fp, "suppress_ifgroup %s ",
 295                                         rtnl_group_n2a(group, b1, sizeof(b1)));
 296                         }
 297                 }
 298         }
 299
 300         if (tb[FRA_FLOW]) {
 301                 __u32 to = rta_getattr_u32(tb[FRA_FLOW]);
 302                 __u32 from = to>>16;
 303
 304                 to &= 0xFFFF;
 305                 if (from) {
 306                         fprintf(fp, "realms %s/",
 307                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 308                 }
 309                 fprintf(fp, "%s ",
 310                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 311         }
 312
 313         if (r->rtm_type == RTN_NAT) {
 314                 if (tb[RTA_GATEWAY]) {
 315                         fprintf(fp, "map-to %s ",
 316                                 format_host_rta(r->rtm_family,
 317                                                 tb[RTA_GATEWAY]));
 318                 } else
 319                         fprintf(fp, "masquerade");
 320         } else if (r->rtm_type == FR_ACT_GOTO) {
 321                 fprintf(fp, "goto ");
 322                 if (tb[FRA_GOTO])
 323                         fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
 324                 else
 325                         fprintf(fp, "none");
 326                 if (r->rtm_flags & FIB_RULE_UNRESOLVED)
 327                         fprintf(fp, " [unresolved]");
 328         } else if (r->rtm_type == FR_ACT_NOP)
 329                 fprintf(fp, "nop");
 330         else if (r->rtm_type != RTN_UNICAST)
 331                 fprintf(fp, "%s",
 332                         rtnl_rtntype_n2a(r->rtm_type,
 333                                          b1, sizeof(b1)));
 334
 335         fprintf(fp, "\n");
 336         fflush(fp);
 337         return 0;
 338 }
 339
 340 static __u32 rule_dump_magic = 0x71706986;
 341
 342 static int save_rule_prep(void)
 343 {
 344         int ret;
 345
 346         if (isatty(STDOUT_FILENO)) {
 347                 fprintf(stderr, "Not sending a binary stream to stdout\n");
 348                 return -1;
 349         }
 350
 351         ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
 352         if (ret != sizeof(rule_dump_magic)) {
 353                 fprintf(stderr, "Can't write magic to dump file\n");
 354                 return -1;
 355         }
 356
 357         return 0;
 358 }
 359
 360 static int save_rule(const struct sockaddr_nl *who,
 361                      struct nlmsghdr *n, void *arg)
 362 {
 363         int ret;
 364
 365         ret = write(STDOUT_FILENO, n, n->nlmsg_len);
 366         if ((ret > 0) && (ret != n->nlmsg_len)) {
 367                 fprintf(stderr, "Short write while saving nlmsg\n");
 368                 ret = -EIO;
 369         }
 370
 371         return ret == n->nlmsg_len ? 0 : ret;
 372 }
 373
 374 static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n,
 375                       void *arg)
 376 {
 377         struct rtnl_handle rth2;
 378         struct rtmsg *r = NLMSG_DATA(n);
 379         int len = n->nlmsg_len;
 380         struct rtattr *tb[FRA_MAX+1];
 381
 382         len -= NLMSG_LENGTH(sizeof(*r));
 383         if (len < 0)
 384                 return -1;
 385
 386         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 387
 388         if (tb[FRA_PRIORITY]) {
 389                 n->nlmsg_type = RTM_DELRULE;
 390                 n->nlmsg_flags = NLM_F_REQUEST;
 391
 392                 if (rtnl_open(&rth2, 0) < 0)
 393                         return -1;
 394
 395                 if (rtnl_talk(&rth2, n, NULL) < 0)
 396                         return -2;
 397
 398                 rtnl_close(&rth2);
 399         }
 400
 401         return 0;
 402 }
 403
 404 static int iprule_list_flush_or_save(int argc, char **argv, int action)
 405 {
 406         rtnl_filter_t filter_fn;
 407         int af = preferred_family;
 408
 409         if (af == AF_UNSPEC)
 410                 af = AF_INET;
 411
 412         if (action != IPRULE_LIST && argc > 0) {
 413                 fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
 414                                 action == IPRULE_SAVE ? "save" : "flush");
 415                 return -1;
 416         }
 417
 418         switch (action) {
 419         case IPRULE_SAVE:
 420                 if (save_rule_prep())
 421                         return -1;
 422                 filter_fn = save_rule;
 423                 break;
 424         case IPRULE_FLUSH:
 425                 filter_fn = flush_rule;
 426                 break;
 427         default:
 428                 filter_fn = print_rule;
 429         }
 430
 431         memset(&filter, 0, sizeof(filter));
 432
 433         while (argc > 0) {
 434                 if (matches(*argv, "preference") == 0 ||
 435                     matches(*argv, "order") == 0 ||
 436                     matches(*argv, "priority") == 0) {
 437                         __u32 pref;
 438
 439                         NEXT_ARG();
 440                         if (get_u32(&pref, *argv, 0))
 441                                 invarg("preference value is invalid\n", *argv);
 442                         filter.pref = pref;
 443                         filter.prefmask = 1;
 444                 } else if (strcmp(*argv, "not") == 0) {
 445                         filter.not = 1;
 446                 } else if (strcmp(*argv, "tos") == 0) {
 447                         __u32 tos;
 448
 449                         NEXT_ARG();
 450                         if (rtnl_dsfield_a2n(&tos, *argv))
 451                                 invarg("TOS value is invalid\n", *argv);
 452                         filter.tos = tos;
 453                         filter.tosmask = 1;
 454                 } else if (strcmp(*argv, "fwmark") == 0) {
 455                         char *slash;
 456                         __u32 fwmark, fwmask;
 457
 458                         NEXT_ARG();
 459                         slash = strchr(*argv, '/');
 460                         if (slash != NULL)
 461                                 *slash = '\0';
 462                         if (get_u32(&fwmark, *argv, 0))
 463                                 invarg("fwmark value is invalid\n", *argv);
 464                         filter.fwmark = fwmark;
 465                         if (slash) {
 466                                 if (get_u32(&fwmask, slash+1, 0))
 467                                         invarg("fwmask value is invalid\n",
 468                                                slash+1);
 469                                 filter.fwmask = fwmask;
 470                         }
 471                 } else if (strcmp(*argv, "dev") == 0 ||
 472                            strcmp(*argv, "iif") == 0) {
 473                         NEXT_ARG();
 474                         if (get_ifname(filter.iif, *argv))
 475                                 invarg("\"iif\"/\"dev\" not a valid ifname", *argv);
 476                         filter.iifmask = 1;
 477                 } else if (strcmp(*argv, "oif") == 0) {
 478                         NEXT_ARG();
 479                         if (get_ifname(filter.oif, *argv))
 480                                 invarg("\"oif\" not a valid ifname", *argv);
 481                         filter.oifmask = 1;
 482                 } else if (strcmp(*argv, "l3mdev") == 0) {
 483                         filter.l3mdev = 1;
 484                 } else if (strcmp(*argv, "uidrange") == 0) {
 485                         NEXT_ARG();
 486                         filter.uidrange = 1;
 487                         if (sscanf(*argv, "%u-%u",
 488                                    &filter.range.start,
 489                                    &filter.range.end) != 2)
 490                                 invarg("invalid UID range\n", *argv);
 491
 492                 } else if (matches(*argv, "lookup") == 0 ||
 493                            matches(*argv, "table") == 0) {
 494                         __u32 tid;
 495
 496                         NEXT_ARG();
 497                         if (rtnl_rttable_a2n(&tid, *argv))
 498                                 invarg("table id value is invalid\n", *argv);
 499                         filter.tb = tid;
 500                 } else if (matches(*argv, "from") == 0 ||
 501                            matches(*argv, "src") == 0) {
 502                         NEXT_ARG();
 503                         get_prefix(&filter.src, *argv, af);
 504                 } else {
 505                         if (matches(*argv, "dst") == 0 ||
 506                             matches(*argv, "to") == 0) {
 507                                 NEXT_ARG();
 508                         }
 509                         get_prefix(&filter.dst, *argv, af);
 510                 }
 511                 argc--; argv++;
 512         }
 513
 514         if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
 515                 perror("Cannot send dump request");
 516                 return 1;
 517         }
 518
 519         if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
 520                 fprintf(stderr, "Dump terminated\n");
 521                 return 1;
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int rule_dump_check_magic(void)
 528 {
 529         int ret;
 530         __u32 magic = 0;
 531
 532         if (isatty(STDIN_FILENO)) {
 533                 fprintf(stderr, "Can't restore rule dump from a terminal\n");
 534                 return -1;
 535         }
 536
 537         ret = fread(&magic, sizeof(magic), 1, stdin);
 538         if (magic != rule_dump_magic) {
 539                 fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n",
 540                         ret, magic);
 541                 return -1;
 542         }
 543
 544         return 0;
 545 }
 546
 547 static int restore_handler(const struct sockaddr_nl *nl,
 548                            struct rtnl_ctrl_data *ctrl,
 549                            struct nlmsghdr *n, void *arg)
 550 {
 551         int ret;
 552
 553         n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
 554
 555         ll_init_map(&rth);
 556
 557         ret = rtnl_talk(&rth, n, NULL);
 558         if ((ret < 0) && (errno == EEXIST))
 559                 ret = 0;
 560
 561         return ret;
 562 }
 563
 564
 565 static int iprule_restore(void)
 566 {
 567         if (rule_dump_check_magic())
 568                 exit(-1);
 569
 570         exit(rtnl_from_file(stdin, &restore_handler, NULL));
 571 }
 572
 573 static int iprule_modify(int cmd, int argc, char **argv)
 574 {
 575         int l3mdev_rule = 0;
 576         int table_ok = 0;
 577         __u32 tid = 0;
 578         struct {
 579                 struct nlmsghdr n;
 580                 struct rtmsg            r;
 581                 char                    buf[1024];
 582         } req = {
 583                 .n.nlmsg_type = cmd,
 584                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
 585                 .n.nlmsg_flags = NLM_F_REQUEST,
 586                 .r.rtm_family = preferred_family,
 587                 .r.rtm_protocol = RTPROT_BOOT,
 588                 .r.rtm_scope = RT_SCOPE_UNIVERSE,
 589                 .r.rtm_type = RTN_UNSPEC,
 590         };
 591
 592         if (cmd == RTM_NEWRULE) {
 593                 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
 594                 req.r.rtm_type = RTN_UNICAST;
 595         }
 596
 597         if (cmd == RTM_DELRULE && argc == 0) {
 598                 fprintf(stderr, "\"ip rule del\" requires arguments.\n");
 599                 return -1;
 600         }
 601
 602         while (argc > 0) {
 603                 if (strcmp(*argv, "not") == 0) {
 604                         req.r.rtm_flags |= FIB_RULE_INVERT;
 605                 } else if (strcmp(*argv, "from") == 0) {
 606                         inet_prefix dst;
 607
 608                         NEXT_ARG();
 609                         get_prefix(&dst, *argv, req.r.rtm_family);
 610                         req.r.rtm_src_len = dst.bitlen;
 611                         addattr_l(&req.n, sizeof(req), FRA_SRC,
 612                                   &dst.data, dst.bytelen);
 613                 } else if (strcmp(*argv, "to") == 0) {
 614                         inet_prefix dst;
 615
 616                         NEXT_ARG();
 617                         get_prefix(&dst, *argv, req.r.rtm_family);
 618                         req.r.rtm_dst_len = dst.bitlen;
 619                         addattr_l(&req.n, sizeof(req), FRA_DST,
 620                                   &dst.data, dst.bytelen);
 621                 } else if (matches(*argv, "preference") == 0 ||
 622                            matches(*argv, "order") == 0 ||
 623                            matches(*argv, "priority") == 0) {
 624                         __u32 pref;
 625
 626                         NEXT_ARG();
 627                         if (get_u32(&pref, *argv, 0))
 628                                 invarg("preference value is invalid\n", *argv);
 629                         addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
 630                 } else if (strcmp(*argv, "tos") == 0 ||
 631                            matches(*argv, "dsfield") == 0) {
 632                         __u32 tos;
 633
 634                         NEXT_ARG();
 635                         if (rtnl_dsfield_a2n(&tos, *argv))
 636                                 invarg("TOS value is invalid\n", *argv);
 637                         req.r.rtm_tos = tos;
 638                 } else if (strcmp(*argv, "fwmark") == 0) {
 639                         char *slash;
 640                         __u32 fwmark, fwmask;
 641
 642                         NEXT_ARG();
 643
 644                         slash = strchr(*argv, '/');
 645                         if (slash != NULL)
 646                                 *slash = '\0';
 647                         if (get_u32(&fwmark, *argv, 0))
 648                                 invarg("fwmark value is invalid\n", *argv);
 649                         addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
 650                         if (slash) {
 651                                 if (get_u32(&fwmask, slash+1, 0))
 652                                         invarg("fwmask value is invalid\n",
 653                                                slash+1);
 654                                 addattr32(&req.n, sizeof(req),
 655                                           FRA_FWMASK, fwmask);
 656                         }
 657                 } else if (matches(*argv, "realms") == 0) {
 658                         __u32 realm;
 659
 660                         NEXT_ARG();
 661                         if (get_rt_realms_or_raw(&realm, *argv))
 662                                 invarg("invalid realms\n", *argv);
 663                         addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
 664                 } else if (matches(*argv, "table") == 0 ||
 665                            strcmp(*argv, "lookup") == 0) {
 666                         NEXT_ARG();
 667                         if (rtnl_rttable_a2n(&tid, *argv))
 668                                 invarg("invalid table ID\n", *argv);
 669                         if (tid < 256)
 670                                 req.r.rtm_table = tid;
 671                         else {
 672                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 673                                 addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
 674                         }
 675                         table_ok = 1;
 676                 } else if (matches(*argv, "suppress_prefixlength") == 0 ||
 677                            strcmp(*argv, "sup_pl") == 0) {
 678                         int pl;
 679
 680                         NEXT_ARG();
 681                         if (get_s32(&pl, *argv, 0) || pl < 0)
 682                                 invarg("suppress_prefixlength value is invalid\n",
 683                                        *argv);
 684                         addattr32(&req.n, sizeof(req),
 685                                   FRA_SUPPRESS_PREFIXLEN, pl);
 686                 } else if (matches(*argv, "suppress_ifgroup") == 0 ||
 687                            strcmp(*argv, "sup_group") == 0) {
 688                         NEXT_ARG();
 689                         int group;
 690
 691                         if (rtnl_group_a2n(&group, *argv))
 692                                 invarg("Invalid \"suppress_ifgroup\" value\n",
 693                                        *argv);
 694                         addattr32(&req.n, sizeof(req),
 695                                   FRA_SUPPRESS_IFGROUP, group);
 696                 } else if (strcmp(*argv, "dev") == 0 ||
 697                            strcmp(*argv, "iif") == 0) {
 698                         NEXT_ARG();
 699                         if (check_ifname(*argv))
 700                                 invarg("\"iif\"/\"dev\" not a valid ifname", *argv);
 701                         addattr_l(&req.n, sizeof(req), FRA_IFNAME,
 702                                   *argv, strlen(*argv)+1);
 703                 } else if (strcmp(*argv, "oif") == 0) {
 704                         NEXT_ARG();
 705                         if (check_ifname(*argv))
 706                                 invarg("\"oif\" not a valid ifname", *argv);
 707                         addattr_l(&req.n, sizeof(req), FRA_OIFNAME,
 708                                   *argv, strlen(*argv)+1);
 709                 } else if (strcmp(*argv, "l3mdev") == 0) {
 710                         addattr8(&req.n, sizeof(req), FRA_L3MDEV, 1);
 711                         table_ok = 1;
 712                         l3mdev_rule = 1;
 713                 } else if (strcmp(*argv, "uidrange") == 0) {
 714                         struct fib_rule_uid_range r;
 715
 716                         NEXT_ARG();
 717                         if (sscanf(*argv, "%u-%u", &r.start, &r.end) != 2)
 718                                 invarg("invalid UID range\n", *argv);
 719                         addattr_l(&req.n, sizeof(req), FRA_UID_RANGE, &r,
 720                                   sizeof(r));
 721                 } else if (strcmp(*argv, "nat") == 0 ||
 722                            matches(*argv, "map-to") == 0) {
 723                         NEXT_ARG();
 724                         fprintf(stderr, "Warning: route NAT is deprecated\n");
 725                         addattr32(&req.n, sizeof(req), RTA_GATEWAY,
 726                                   get_addr32(*argv));
 727                         req.r.rtm_type = RTN_NAT;
 728                 } else {
 729                         int type;
 730
 731                         if (strcmp(*argv, "type") == 0)
 732                                 NEXT_ARG();
 733
 734                         if (matches(*argv, "help") == 0)
 735                                 usage();
 736                         else if (matches(*argv, "goto") == 0) {
 737                                 __u32 target;
 738
 739                                 type = FR_ACT_GOTO;
 740                                 NEXT_ARG();
 741                                 if (get_u32(&target, *argv, 0))
 742                                         invarg("invalid target\n", *argv);
 743                                 addattr32(&req.n, sizeof(req),
 744                                           FRA_GOTO, target);
 745                         } else if (matches(*argv, "nop") == 0)
 746                                 type = FR_ACT_NOP;
 747                         else if (rtnl_rtntype_a2n(&type, *argv))
 748                                 invarg("Failed to parse rule type", *argv);
 749                         req.r.rtm_type = type;
 750                         table_ok = 1;
 751                 }
 752                 argc--;
 753                 argv++;
 754         }
 755
 756         if (l3mdev_rule && tid != 0) {
 757                 fprintf(stderr,
 758                         "table can not be specified for l3mdev rules\n");
 759                 return -EINVAL;
 760         }
 761
 762         if (req.r.rtm_family == AF_UNSPEC)
 763                 req.r.rtm_family = AF_INET;
 764
 765         if (!table_ok && cmd == RTM_NEWRULE)
 766                 req.r.rtm_table = RT_TABLE_MAIN;
 767
 768         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 769                 return -2;
 770
 771         return 0;
 772 }
 773
 774 int do_iprule(int argc, char **argv)
 775 {
 776         if (argc < 1) {
 777                 return iprule_list_flush_or_save(0, NULL, IPRULE_LIST);
 778         } else if (matches(argv[0], "list") == 0 ||
 779                    matches(argv[0], "lst") == 0 ||
 780                    matches(argv[0], "show") == 0) {
 781                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_LIST);
 782         } else if (matches(argv[0], "save") == 0) {
 783                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_SAVE);
 784         } else if (matches(argv[0], "restore") == 0) {
 785                 return iprule_restore();
 786         } else if (matches(argv[0], "add") == 0) {
 787                 return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
 788         } else if (matches(argv[0], "delete") == 0) {
 789                 return iprule_modify(RTM_DELRULE, argc-1, argv+1);
 790         } else if (matches(argv[0], "flush") == 0) {
 791                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_FLUSH);
 792         } else if (matches(argv[0], "help") == 0)
 793                 usage();
 794
 795         fprintf(stderr,
 796                 "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
 797         exit(-1);
 798 }
 799
 800 int do_multirule(int argc, char **argv)
 801 {
 802         switch (preferred_family) {
 803         case AF_UNSPEC:
 804         case AF_INET:
 805                 preferred_family = RTNL_FAMILY_IPMR;
 806                 break;
 807         case AF_INET6:
 808                 preferred_family = RTNL_FAMILY_IP6MR;
 809                 break;
 810         case RTNL_FAMILY_IPMR:
 811         case RTNL_FAMILY_IP6MR:
 812                 break;
 813         default:
 814                 fprintf(stderr,
 815                         "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
 816                         preferred_family);
 817                 exit(-1);
 818         }
 819
 820         return do_iprule(argc, argv);
 821 }