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/if.h>
  24 #include <linux/fib_rules.h>
  25 #include <errno.h>
  26
  27 #include "rt_names.h"
  28 #include "utils.h"
  29 #include "ip_common.h"
  30
  31 enum list_action {
  32         IPRULE_LIST,
  33         IPRULE_FLUSH,
  34         IPRULE_SAVE,
  35 };
  36
  37 extern struct rtnl_handle rth;
  38
  39 static void usage(void) __attribute__((noreturn));
  40
  41 static void usage(void)
  42 {
  43         fprintf(stderr,
  44                 "Usage: ip rule { add | del } SELECTOR ACTION\n"
  45                 "       ip rule { flush | save | restore }\n"
  46                 "       ip rule [ list [ SELECTOR ]]\n"
  47                 "SELECTOR := [ not ] [ from PREFIX ] [ to PREFIX ] [ tos TOS ] [ fwmark FWMARK[/MASK] ]\n"
  48                 "            [ iif STRING ] [ oif STRING ] [ pref NUMBER ] [ l3mdev ]\n"
  49                 "            [ uidrange NUMBER-NUMBER ]\n"
  50                 "ACTION := [ table TABLE_ID ]\n"
  51                 "          [ nat ADDRESS ]\n"
  52                 "          [ realms [SRCREALM/]DSTREALM ]\n"
  53                 "          [ goto NUMBER ]\n"
  54                 "          SUPPRESSOR\n"
  55                 "SUPPRESSOR := [ suppress_prefixlength NUMBER ]\n"
  56                 "              [ suppress_ifgroup DEVGROUP ]\n"
  57                 "TABLE_ID := [ local | main | default | NUMBER ]\n");
  58         exit(-1);
  59 }
  60
  61 static struct
  62 {
  63         int not;
  64         int l3mdev;
  65         int iifmask, oifmask, uidrange;
  66         unsigned int tb;
  67         unsigned int tos, tosmask;
  68         unsigned int pref, prefmask;
  69         unsigned int fwmark, fwmask;
  70         char iif[IFNAMSIZ];
  71         char oif[IFNAMSIZ];
  72         struct fib_rule_uid_range range;
  73         inet_prefix src;
  74         inet_prefix dst;
  75 } filter;
  76
  77 static bool filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
  78 {
  79         struct rtmsg *r = NLMSG_DATA(n);
  80         inet_prefix src = { .family = r->rtm_family };
  81         inet_prefix dst = { .family = r->rtm_family };
  82         __u32 table;
  83
  84         if (preferred_family != AF_UNSPEC && r->rtm_family != preferred_family)
  85                 return false;
  86
  87         if (filter.prefmask &&
  88             filter.pref ^ (tb[FRA_PRIORITY] ? rta_getattr_u32(tb[FRA_PRIORITY]) : 0))
  89                 return false;
  90         if (filter.not && !(r->rtm_flags & FIB_RULE_INVERT))
  91                 return false;
  92
  93         if (filter.src.family) {
  94                 if (tb[FRA_SRC]) {
  95                         memcpy(&src.data, RTA_DATA(tb[FRA_SRC]),
  96                                (r->rtm_src_len + 7) / 8);
  97                 }
  98                 if (filter.src.family != r->rtm_family ||
  99                     filter.src.bitlen > r->rtm_src_len ||
 100                     inet_addr_match(&src, &filter.src, filter.src.bitlen))
 101                         return false;
 102         }
 103
 104         if (filter.dst.family) {
 105                 if (tb[FRA_DST]) {
 106                         memcpy(&dst.data, RTA_DATA(tb[FRA_DST]),
 107                                (r->rtm_dst_len + 7) / 8);
 108                 }
 109                 if (filter.dst.family != r->rtm_family ||
 110                     filter.dst.bitlen > r->rtm_dst_len ||
 111                     inet_addr_match(&dst, &filter.dst, filter.dst.bitlen))
 112                         return false;
 113         }
 114
 115         if (filter.tosmask && filter.tos ^ r->rtm_tos)
 116                 return false;
 117
 118         if (filter.fwmark) {
 119                 __u32 mark = 0;
 120
 121                 if (tb[FRA_FWMARK])
 122                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 123                 if (filter.fwmark ^ mark)
 124                         return false;
 125         }
 126         if (filter.fwmask) {
 127                 __u32 mask = 0;
 128
 129                 if (tb[FRA_FWMASK])
 130                         mask = rta_getattr_u32(tb[FRA_FWMASK]);
 131                 if (filter.fwmask ^ mask)
 132                         return false;
 133         }
 134
 135         if (filter.iifmask) {
 136                 if (tb[FRA_IFNAME]) {
 137                         if (strcmp(filter.iif, rta_getattr_str(tb[FRA_IFNAME])) != 0)
 138                                 return false;
 139                 } else {
 140                         return false;
 141                 }
 142         }
 143
 144         if (filter.oifmask) {
 145                 if (tb[FRA_OIFNAME]) {
 146                         if (strcmp(filter.oif, rta_getattr_str(tb[FRA_OIFNAME])) != 0)
 147                                 return false;
 148                 } else {
 149                         return false;
 150                 }
 151         }
 152
 153         if (filter.l3mdev && !(tb[FRA_L3MDEV] && rta_getattr_u8(tb[FRA_L3MDEV])))
 154                 return false;
 155
 156         if (filter.uidrange) {
 157                 struct fib_rule_uid_range *r = RTA_DATA(tb[FRA_UID_RANGE]);
 158
 159                 if (!tb[FRA_UID_RANGE] ||
 160                     r->start != filter.range.start ||
 161                     r->end != filter.range.end)
 162                         return false;
 163         }
 164
 165         table = rtm_get_table(r, tb);
 166         if (filter.tb > 0 && filter.tb ^ table)
 167                 return false;
 168
 169         return true;
 170 }
 171
 172 int print_rule(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 173 {
 174         FILE *fp = (FILE *)arg;
 175         struct rtmsg *r = NLMSG_DATA(n);
 176         int len = n->nlmsg_len;
 177         int host_len = -1;
 178         __u32 table;
 179         struct rtattr *tb[FRA_MAX+1];
 180
 181         SPRINT_BUF(b1);
 182
 183         if (n->nlmsg_type != RTM_NEWRULE && n->nlmsg_type != RTM_DELRULE)
 184                 return 0;
 185
 186         len -= NLMSG_LENGTH(sizeof(*r));
 187         if (len < 0)
 188                 return -1;
 189
 190         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 191
 192         host_len = af_bit_len(r->rtm_family);
 193
 194         if (!filter_nlmsg(n, tb, host_len))
 195                 return 0;
 196
 197         if (n->nlmsg_type == RTM_DELRULE)
 198                 fprintf(fp, "Deleted ");
 199
 200         if (tb[FRA_PRIORITY])
 201                 fprintf(fp, "%u:\t",
 202                         rta_getattr_u32(tb[FRA_PRIORITY]));
 203         else
 204                 fprintf(fp, "0:\t");
 205
 206         if (r->rtm_flags & FIB_RULE_INVERT)
 207                 fprintf(fp, "not ");
 208
 209         if (tb[FRA_SRC]) {
 210                 if (r->rtm_src_len != host_len) {
 211                         fprintf(fp, "from %s/%u ",
 212                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_SRC]),
 213                                 r->rtm_src_len);
 214                 } else {
 215                         fprintf(fp, "from %s ",
 216                                 format_host_rta(r->rtm_family, tb[FRA_SRC]));
 217                 }
 218         } else if (r->rtm_src_len) {
 219                 fprintf(fp, "from 0/%d ", r->rtm_src_len);
 220         } else {
 221                 fprintf(fp, "from all ");
 222         }
 223
 224         if (tb[FRA_DST]) {
 225                 if (r->rtm_dst_len != host_len) {
 226                         fprintf(fp, "to %s/%u ",
 227                                 rt_addr_n2a_rta(r->rtm_family, tb[FRA_DST]),
 228                                 r->rtm_dst_len);
 229                 } else {
 230                         fprintf(fp, "to %s ",
 231                                 format_host_rta(r->rtm_family, tb[FRA_DST]));
 232                 }
 233         } else if (r->rtm_dst_len) {
 234                 fprintf(fp, "to 0/%d ", r->rtm_dst_len);
 235         }
 236
 237         if (r->rtm_tos) {
 238                 SPRINT_BUF(b1);
 239                 fprintf(fp, "tos %s ",
 240                         rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 241         }
 242
 243         if (tb[FRA_FWMARK] || tb[FRA_FWMASK]) {
 244                 __u32 mark = 0, mask = 0;
 245
 246                 if (tb[FRA_FWMARK])
 247                         mark = rta_getattr_u32(tb[FRA_FWMARK]);
 248
 249                 if (tb[FRA_FWMASK] &&
 250                     (mask = rta_getattr_u32(tb[FRA_FWMASK])) != 0xFFFFFFFF)
 251                         fprintf(fp, "fwmark 0x%x/0x%x ", mark, mask);
 252                 else
 253                         fprintf(fp, "fwmark 0x%x ", mark);
 254         }
 255
 256         if (tb[FRA_IFNAME]) {
 257                 fprintf(fp, "iif %s ", rta_getattr_str(tb[FRA_IFNAME]));
 258                 if (r->rtm_flags & FIB_RULE_IIF_DETACHED)
 259                         fprintf(fp, "[detached] ");
 260         }
 261
 262         if (tb[FRA_OIFNAME]) {
 263                 fprintf(fp, "oif %s ", rta_getattr_str(tb[FRA_OIFNAME]));
 264                 if (r->rtm_flags & FIB_RULE_OIF_DETACHED)
 265                         fprintf(fp, "[detached] ");
 266         }
 267
 268         if (tb[FRA_L3MDEV]) {
 269                 if (rta_getattr_u8(tb[FRA_L3MDEV]))
 270                         fprintf(fp, "lookup [l3mdev-table] ");
 271         }
 272
 273         if (tb[FRA_UID_RANGE]) {
 274                 struct fib_rule_uid_range *r = RTA_DATA(tb[FRA_UID_RANGE]);
 275
 276                 fprintf(fp, "uidrange %u-%u ", r->start, r->end);
 277         }
 278
 279         table = rtm_get_table(r, tb);
 280         if (table) {
 281                 fprintf(fp, "lookup %s ",
 282                         rtnl_rttable_n2a(table, b1, sizeof(b1)));
 283
 284                 if (tb[FRA_SUPPRESS_PREFIXLEN]) {
 285                         int pl = rta_getattr_u32(tb[FRA_SUPPRESS_PREFIXLEN]);
 286
 287                         if (pl != -1)
 288                                 fprintf(fp, "suppress_prefixlength %d ", pl);
 289                 }
 290                 if (tb[FRA_SUPPRESS_IFGROUP]) {
 291                         int group = rta_getattr_u32(tb[FRA_SUPPRESS_IFGROUP]);
 292
 293                         if (group != -1) {
 294                                 SPRINT_BUF(b1);
 295                                 fprintf(fp, "suppress_ifgroup %s ",
 296                                         rtnl_group_n2a(group, b1, sizeof(b1)));
 297                         }
 298                 }
 299         }
 300
 301         if (tb[FRA_FLOW]) {
 302                 __u32 to = rta_getattr_u32(tb[FRA_FLOW]);
 303                 __u32 from = to>>16;
 304
 305                 to &= 0xFFFF;
 306                 if (from) {
 307                         fprintf(fp, "realms %s/",
 308                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 309                 }
 310                 fprintf(fp, "%s ",
 311                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 312         }
 313
 314         if (r->rtm_type == RTN_NAT) {
 315                 if (tb[RTA_GATEWAY]) {
 316                         fprintf(fp, "map-to %s ",
 317                                 format_host_rta(r->rtm_family,
 318                                                 tb[RTA_GATEWAY]));
 319                 } else
 320                         fprintf(fp, "masquerade");
 321         } else if (r->rtm_type == FR_ACT_GOTO) {
 322                 fprintf(fp, "goto ");
 323                 if (tb[FRA_GOTO])
 324                         fprintf(fp, "%u", rta_getattr_u32(tb[FRA_GOTO]));
 325                 else
 326                         fprintf(fp, "none");
 327                 if (r->rtm_flags & FIB_RULE_UNRESOLVED)
 328                         fprintf(fp, " [unresolved]");
 329         } else if (r->rtm_type == FR_ACT_NOP)
 330                 fprintf(fp, "nop");
 331         else if (r->rtm_type != RTN_UNICAST)
 332                 fprintf(fp, "%s",
 333                         rtnl_rtntype_n2a(r->rtm_type,
 334                                          b1, sizeof(b1)));
 335
 336         fprintf(fp, "\n");
 337         fflush(fp);
 338         return 0;
 339 }
 340
 341 static __u32 rule_dump_magic = 0x71706986;
 342
 343 static int save_rule_prep(void)
 344 {
 345         int ret;
 346
 347         if (isatty(STDOUT_FILENO)) {
 348                 fprintf(stderr, "Not sending a binary stream to stdout\n");
 349                 return -1;
 350         }
 351
 352         ret = write(STDOUT_FILENO, &rule_dump_magic, sizeof(rule_dump_magic));
 353         if (ret != sizeof(rule_dump_magic)) {
 354                 fprintf(stderr, "Can't write magic to dump file\n");
 355                 return -1;
 356         }
 357
 358         return 0;
 359 }
 360
 361 static int save_rule(const struct sockaddr_nl *who,
 362                      struct nlmsghdr *n, void *arg)
 363 {
 364         int ret;
 365
 366         ret = write(STDOUT_FILENO, n, n->nlmsg_len);
 367         if ((ret > 0) && (ret != n->nlmsg_len)) {
 368                 fprintf(stderr, "Short write while saving nlmsg\n");
 369                 ret = -EIO;
 370         }
 371
 372         return ret == n->nlmsg_len ? 0 : ret;
 373 }
 374
 375 static int flush_rule(const struct sockaddr_nl *who, struct nlmsghdr *n,
 376                       void *arg)
 377 {
 378         struct rtnl_handle rth2;
 379         struct rtmsg *r = NLMSG_DATA(n);
 380         int len = n->nlmsg_len;
 381         struct rtattr *tb[FRA_MAX+1];
 382
 383         len -= NLMSG_LENGTH(sizeof(*r));
 384         if (len < 0)
 385                 return -1;
 386
 387         parse_rtattr(tb, FRA_MAX, RTM_RTA(r), len);
 388
 389         if (tb[FRA_PRIORITY]) {
 390                 n->nlmsg_type = RTM_DELRULE;
 391                 n->nlmsg_flags = NLM_F_REQUEST;
 392
 393                 if (rtnl_open(&rth2, 0) < 0)
 394                         return -1;
 395
 396                 if (rtnl_talk(&rth2, n, NULL) < 0)
 397                         return -2;
 398
 399                 rtnl_close(&rth2);
 400         }
 401
 402         return 0;
 403 }
 404
 405 static int iprule_list_flush_or_save(int argc, char **argv, int action)
 406 {
 407         rtnl_filter_t filter_fn;
 408         int af = preferred_family;
 409
 410         if (af == AF_UNSPEC)
 411                 af = AF_INET;
 412
 413         if (action != IPRULE_LIST && argc > 0) {
 414                 fprintf(stderr, "\"ip rule %s\" does not take any arguments.\n",
 415                                 action == IPRULE_SAVE ? "save" : "flush");
 416                 return -1;
 417         }
 418
 419         switch (action) {
 420         case IPRULE_SAVE:
 421                 if (save_rule_prep())
 422                         return -1;
 423                 filter_fn = save_rule;
 424                 break;
 425         case IPRULE_FLUSH:
 426                 filter_fn = flush_rule;
 427                 break;
 428         default:
 429                 filter_fn = print_rule;
 430         }
 431
 432         memset(&filter, 0, sizeof(filter));
 433
 434         while (argc > 0) {
 435                 if (matches(*argv, "preference") == 0 ||
 436                     matches(*argv, "order") == 0 ||
 437                     matches(*argv, "priority") == 0) {
 438                         __u32 pref;
 439
 440                         NEXT_ARG();
 441                         if (get_u32(&pref, *argv, 0))
 442                                 invarg("preference value is invalid\n", *argv);
 443                         filter.pref = pref;
 444                         filter.prefmask = 1;
 445                 } else if (strcmp(*argv, "not") == 0) {
 446                         filter.not = 1;
 447                 } else if (strcmp(*argv, "tos") == 0) {
 448                         __u32 tos;
 449
 450                         NEXT_ARG();
 451                         if (rtnl_dsfield_a2n(&tos, *argv))
 452                                 invarg("TOS value is invalid\n", *argv);
 453                         filter.tos = tos;
 454                         filter.tosmask = 1;
 455                 } else if (strcmp(*argv, "fwmark") == 0) {
 456                         char *slash;
 457                         __u32 fwmark, fwmask;
 458
 459                         NEXT_ARG();
 460                         slash = strchr(*argv, '/');
 461                         if (slash != NULL)
 462                                 *slash = '\0';
 463                         if (get_u32(&fwmark, *argv, 0))
 464                                 invarg("fwmark value is invalid\n", *argv);
 465                         filter.fwmark = fwmark;
 466                         if (slash) {
 467                                 if (get_u32(&fwmask, slash+1, 0))
 468                                         invarg("fwmask value is invalid\n",
 469                                                slash+1);
 470                                 filter.fwmask = fwmask;
 471                         }
 472                 } else if (strcmp(*argv, "dev") == 0 ||
 473                            strcmp(*argv, "iif") == 0) {
 474                         NEXT_ARG();
 475                         if (get_ifname(filter.iif, *argv))
 476                                 invarg("\"iif\"/\"dev\" not a valid ifname", *argv);
 477                         filter.iifmask = 1;
 478                 } else if (strcmp(*argv, "oif") == 0) {
 479                         NEXT_ARG();
 480                         if (get_ifname(filter.oif, *argv))
 481                                 invarg("\"oif\" not a valid ifname", *argv);
 482                         filter.oifmask = 1;
 483                 } else if (strcmp(*argv, "l3mdev") == 0) {
 484                         filter.l3mdev = 1;
 485                 } else if (strcmp(*argv, "uidrange") == 0) {
 486                         NEXT_ARG();
 487                         filter.uidrange = 1;
 488                         if (sscanf(*argv, "%u-%u",
 489                                    &filter.range.start,
 490                                    &filter.range.end) != 2)
 491                                 invarg("invalid UID range\n", *argv);
 492
 493                 } else if (matches(*argv, "lookup") == 0 ||
 494                            matches(*argv, "table") == 0) {
 495                         __u32 tid;
 496
 497                         NEXT_ARG();
 498                         if (rtnl_rttable_a2n(&tid, *argv))
 499                                 invarg("table id value is invalid\n", *argv);
 500                         filter.tb = tid;
 501                 } else if (matches(*argv, "from") == 0 ||
 502                            matches(*argv, "src") == 0) {
 503                         NEXT_ARG();
 504                         get_prefix(&filter.src, *argv, af);
 505                 } else {
 506                         if (matches(*argv, "dst") == 0 ||
 507                             matches(*argv, "to") == 0) {
 508                                 NEXT_ARG();
 509                         }
 510                         get_prefix(&filter.dst, *argv, af);
 511                 }
 512                 argc--; argv++;
 513         }
 514
 515         if (rtnl_wilddump_request(&rth, af, RTM_GETRULE) < 0) {
 516                 perror("Cannot send dump request");
 517                 return 1;
 518         }
 519
 520         if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
 521                 fprintf(stderr, "Dump terminated\n");
 522                 return 1;
 523         }
 524
 525         return 0;
 526 }
 527
 528 static int rule_dump_check_magic(void)
 529 {
 530         int ret;
 531         __u32 magic = 0;
 532
 533         if (isatty(STDIN_FILENO)) {
 534                 fprintf(stderr, "Can't restore rule dump from a terminal\n");
 535                 return -1;
 536         }
 537
 538         ret = fread(&magic, sizeof(magic), 1, stdin);
 539         if (magic != rule_dump_magic) {
 540                 fprintf(stderr, "Magic mismatch (%d elems, %x magic)\n",
 541                         ret, magic);
 542                 return -1;
 543         }
 544
 545         return 0;
 546 }
 547
 548 static int restore_handler(const struct sockaddr_nl *nl,
 549                            struct rtnl_ctrl_data *ctrl,
 550                            struct nlmsghdr *n, void *arg)
 551 {
 552         int ret;
 553
 554         n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
 555
 556         ll_init_map(&rth);
 557
 558         ret = rtnl_talk(&rth, n, NULL);
 559         if ((ret < 0) && (errno == EEXIST))
 560                 ret = 0;
 561
 562         return ret;
 563 }
 564
 565
 566 static int iprule_restore(void)
 567 {
 568         if (rule_dump_check_magic())
 569                 exit(-1);
 570
 571         exit(rtnl_from_file(stdin, &restore_handler, NULL));
 572 }
 573
 574 static int iprule_modify(int cmd, int argc, char **argv)
 575 {
 576         int l3mdev_rule = 0;
 577         int table_ok = 0;
 578         __u32 tid = 0;
 579         struct {
 580                 struct nlmsghdr n;
 581                 struct rtmsg            r;
 582                 char                    buf[1024];
 583         } req = {
 584                 .n.nlmsg_type = cmd,
 585                 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg)),
 586                 .n.nlmsg_flags = NLM_F_REQUEST,
 587                 .r.rtm_family = preferred_family,
 588                 .r.rtm_protocol = RTPROT_BOOT,
 589                 .r.rtm_scope = RT_SCOPE_UNIVERSE,
 590                 .r.rtm_type = RTN_UNSPEC,
 591         };
 592
 593         if (cmd == RTM_NEWRULE) {
 594                 req.n.nlmsg_flags |= NLM_F_CREATE|NLM_F_EXCL;
 595                 req.r.rtm_type = RTN_UNICAST;
 596         }
 597
 598         if (cmd == RTM_DELRULE && argc == 0) {
 599                 fprintf(stderr, "\"ip rule del\" requires arguments.\n");
 600                 return -1;
 601         }
 602
 603         while (argc > 0) {
 604                 if (strcmp(*argv, "not") == 0) {
 605                         req.r.rtm_flags |= FIB_RULE_INVERT;
 606                 } else if (strcmp(*argv, "from") == 0) {
 607                         inet_prefix dst;
 608
 609                         NEXT_ARG();
 610                         get_prefix(&dst, *argv, req.r.rtm_family);
 611                         req.r.rtm_src_len = dst.bitlen;
 612                         addattr_l(&req.n, sizeof(req), FRA_SRC,
 613                                   &dst.data, dst.bytelen);
 614                 } else if (strcmp(*argv, "to") == 0) {
 615                         inet_prefix dst;
 616
 617                         NEXT_ARG();
 618                         get_prefix(&dst, *argv, req.r.rtm_family);
 619                         req.r.rtm_dst_len = dst.bitlen;
 620                         addattr_l(&req.n, sizeof(req), FRA_DST,
 621                                   &dst.data, dst.bytelen);
 622                 } else if (matches(*argv, "preference") == 0 ||
 623                            matches(*argv, "order") == 0 ||
 624                            matches(*argv, "priority") == 0) {
 625                         __u32 pref;
 626
 627                         NEXT_ARG();
 628                         if (get_u32(&pref, *argv, 0))
 629                                 invarg("preference value is invalid\n", *argv);
 630                         addattr32(&req.n, sizeof(req), FRA_PRIORITY, pref);
 631                 } else if (strcmp(*argv, "tos") == 0 ||
 632                            matches(*argv, "dsfield") == 0) {
 633                         __u32 tos;
 634
 635                         NEXT_ARG();
 636                         if (rtnl_dsfield_a2n(&tos, *argv))
 637                                 invarg("TOS value is invalid\n", *argv);
 638                         req.r.rtm_tos = tos;
 639                 } else if (strcmp(*argv, "fwmark") == 0) {
 640                         char *slash;
 641                         __u32 fwmark, fwmask;
 642
 643                         NEXT_ARG();
 644
 645                         slash = strchr(*argv, '/');
 646                         if (slash != NULL)
 647                                 *slash = '\0';
 648                         if (get_u32(&fwmark, *argv, 0))
 649                                 invarg("fwmark value is invalid\n", *argv);
 650                         addattr32(&req.n, sizeof(req), FRA_FWMARK, fwmark);
 651                         if (slash) {
 652                                 if (get_u32(&fwmask, slash+1, 0))
 653                                         invarg("fwmask value is invalid\n",
 654                                                slash+1);
 655                                 addattr32(&req.n, sizeof(req),
 656                                           FRA_FWMASK, fwmask);
 657                         }
 658                 } else if (matches(*argv, "realms") == 0) {
 659                         __u32 realm;
 660
 661                         NEXT_ARG();
 662                         if (get_rt_realms_or_raw(&realm, *argv))
 663                                 invarg("invalid realms\n", *argv);
 664                         addattr32(&req.n, sizeof(req), FRA_FLOW, realm);
 665                 } else if (matches(*argv, "table") == 0 ||
 666                            strcmp(*argv, "lookup") == 0) {
 667                         NEXT_ARG();
 668                         if (rtnl_rttable_a2n(&tid, *argv))
 669                                 invarg("invalid table ID\n", *argv);
 670                         if (tid < 256)
 671                                 req.r.rtm_table = tid;
 672                         else {
 673                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 674                                 addattr32(&req.n, sizeof(req), FRA_TABLE, tid);
 675                         }
 676                         table_ok = 1;
 677                 } else if (matches(*argv, "suppress_prefixlength") == 0 ||
 678                            strcmp(*argv, "sup_pl") == 0) {
 679                         int pl;
 680
 681                         NEXT_ARG();
 682                         if (get_s32(&pl, *argv, 0) || pl < 0)
 683                                 invarg("suppress_prefixlength value is invalid\n",
 684                                        *argv);
 685                         addattr32(&req.n, sizeof(req),
 686                                   FRA_SUPPRESS_PREFIXLEN, pl);
 687                 } else if (matches(*argv, "suppress_ifgroup") == 0 ||
 688                            strcmp(*argv, "sup_group") == 0) {
 689                         NEXT_ARG();
 690                         int group;
 691
 692                         if (rtnl_group_a2n(&group, *argv))
 693                                 invarg("Invalid \"suppress_ifgroup\" value\n",
 694                                        *argv);
 695                         addattr32(&req.n, sizeof(req),
 696                                   FRA_SUPPRESS_IFGROUP, group);
 697                 } else if (strcmp(*argv, "dev") == 0 ||
 698                            strcmp(*argv, "iif") == 0) {
 699                         NEXT_ARG();
 700                         if (check_ifname(*argv))
 701                                 invarg("\"iif\"/\"dev\" not a valid ifname", *argv);
 702                         addattr_l(&req.n, sizeof(req), FRA_IFNAME,
 703                                   *argv, strlen(*argv)+1);
 704                 } else if (strcmp(*argv, "oif") == 0) {
 705                         NEXT_ARG();
 706                         if (check_ifname(*argv))
 707                                 invarg("\"oif\" not a valid ifname", *argv);
 708                         addattr_l(&req.n, sizeof(req), FRA_OIFNAME,
 709                                   *argv, strlen(*argv)+1);
 710                 } else if (strcmp(*argv, "l3mdev") == 0) {
 711                         addattr8(&req.n, sizeof(req), FRA_L3MDEV, 1);
 712                         table_ok = 1;
 713                         l3mdev_rule = 1;
 714                 } else if (strcmp(*argv, "uidrange") == 0) {
 715                         struct fib_rule_uid_range r;
 716
 717                         NEXT_ARG();
 718                         if (sscanf(*argv, "%u-%u", &r.start, &r.end) != 2)
 719                                 invarg("invalid UID range\n", *argv);
 720                         addattr_l(&req.n, sizeof(req), FRA_UID_RANGE, &r,
 721                                   sizeof(r));
 722                 } else if (strcmp(*argv, "nat") == 0 ||
 723                            matches(*argv, "map-to") == 0) {
 724                         NEXT_ARG();
 725                         fprintf(stderr, "Warning: route NAT is deprecated\n");
 726                         addattr32(&req.n, sizeof(req), RTA_GATEWAY,
 727                                   get_addr32(*argv));
 728                         req.r.rtm_type = RTN_NAT;
 729                 } else {
 730                         int type;
 731
 732                         if (strcmp(*argv, "type") == 0)
 733                                 NEXT_ARG();
 734
 735                         if (matches(*argv, "help") == 0)
 736                                 usage();
 737                         else if (matches(*argv, "goto") == 0) {
 738                                 __u32 target;
 739
 740                                 type = FR_ACT_GOTO;
 741                                 NEXT_ARG();
 742                                 if (get_u32(&target, *argv, 0))
 743                                         invarg("invalid target\n", *argv);
 744                                 addattr32(&req.n, sizeof(req),
 745                                           FRA_GOTO, target);
 746                         } else if (matches(*argv, "nop") == 0)
 747                                 type = FR_ACT_NOP;
 748                         else if (rtnl_rtntype_a2n(&type, *argv))
 749                                 invarg("Failed to parse rule type", *argv);
 750                         req.r.rtm_type = type;
 751                         table_ok = 1;
 752                 }
 753                 argc--;
 754                 argv++;
 755         }
 756
 757         if (l3mdev_rule && tid != 0) {
 758                 fprintf(stderr,
 759                         "table can not be specified for l3mdev rules\n");
 760                 return -EINVAL;
 761         }
 762
 763         if (req.r.rtm_family == AF_UNSPEC)
 764                 req.r.rtm_family = AF_INET;
 765
 766         if (!table_ok && cmd == RTM_NEWRULE)
 767                 req.r.rtm_table = RT_TABLE_MAIN;
 768
 769         if (rtnl_talk(&rth, &req.n, NULL) < 0)
 770                 return -2;
 771
 772         return 0;
 773 }
 774
 775 int do_iprule(int argc, char **argv)
 776 {
 777         if (argc < 1) {
 778                 return iprule_list_flush_or_save(0, NULL, IPRULE_LIST);
 779         } else if (matches(argv[0], "list") == 0 ||
 780                    matches(argv[0], "lst") == 0 ||
 781                    matches(argv[0], "show") == 0) {
 782                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_LIST);
 783         } else if (matches(argv[0], "save") == 0) {
 784                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_SAVE);
 785         } else if (matches(argv[0], "restore") == 0) {
 786                 return iprule_restore();
 787         } else if (matches(argv[0], "add") == 0) {
 788                 return iprule_modify(RTM_NEWRULE, argc-1, argv+1);
 789         } else if (matches(argv[0], "delete") == 0) {
 790                 return iprule_modify(RTM_DELRULE, argc-1, argv+1);
 791         } else if (matches(argv[0], "flush") == 0) {
 792                 return iprule_list_flush_or_save(argc-1, argv+1, IPRULE_FLUSH);
 793         } else if (matches(argv[0], "help") == 0)
 794                 usage();
 795
 796         fprintf(stderr,
 797                 "Command \"%s\" is unknown, try \"ip rule help\".\n", *argv);
 798         exit(-1);
 799 }
 800
 801 int do_multirule(int argc, char **argv)
 802 {
 803         switch (preferred_family) {
 804         case AF_UNSPEC:
 805         case AF_INET:
 806                 preferred_family = RTNL_FAMILY_IPMR;
 807                 break;
 808         case AF_INET6:
 809                 preferred_family = RTNL_FAMILY_IP6MR;
 810                 break;
 811         case RTNL_FAMILY_IPMR:
 812         case RTNL_FAMILY_IP6MR:
 813                 break;
 814         default:
 815                 fprintf(stderr,
 816                         "Multicast rules are only supported for IPv4/IPv6, was: %i\n",
 817                         preferred_family);
 818                 exit(-1);
 819         }
 820
 821         return do_iprule(argc, argv);
 822 }