networking/libiproute/iproute.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   4  *
   5  * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   6  *
   7  * Changes:
   8  *
   9  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  10  * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
  11  */
  12
  13 #include "ip_common.h"  /* #include "libbb.h" is inside */
  14 #include "rt_names.h"
  15 #include "utils.h"
  16
  17 #ifndef RTAX_RTTVAR
  18 #define RTAX_RTTVAR RTAX_HOPS
  19 #endif
  20
  21
  22 struct filter_t {
  23         int tb;
  24         smallint flushed;
  25         char *flushb;
  26         int flushp;
  27         int flushe;
  28         struct rtnl_handle *rth;
  29         //int protocol, protocolmask; - write-only fields?!
  30         //int scope, scopemask; - unused
  31         //int type; - read-only
  32         //int typemask; - unused
  33         //int tos, tosmask; - unused
  34         int iif;
  35         int oif;
  36         //int realm, realmmask; - unused
  37         //inet_prefix rprefsrc; - read-only
  38         inet_prefix rvia;
  39         inet_prefix rdst;
  40         inet_prefix mdst;
  41         inet_prefix rsrc;
  42         inet_prefix msrc;
  43 } FIX_ALIASING;
  44 typedef struct filter_t filter_t;
  45
  46 #define G_filter (*(filter_t*)&bb_common_bufsiz1)
  47
  48 static int flush_update(void)
  49 {
  50         if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
  51                 bb_perror_msg("can't send flush request");
  52                 return -1;
  53         }
  54         G_filter.flushp = 0;
  55         return 0;
  56 }
  57
  58 static unsigned get_hz(void)
  59 {
  60         static unsigned hz_internal;
  61         FILE *fp;
  62
  63         if (hz_internal)
  64                 return hz_internal;
  65
  66         fp = fopen_for_read("/proc/net/psched");
  67         if (fp) {
  68                 unsigned nom, denom;
  69
  70                 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
  71                         if (nom == 1000000)
  72                                 hz_internal = denom;
  73                 fclose(fp);
  74         }
  75         if (!hz_internal)
  76                 hz_internal = sysconf(_SC_CLK_TCK);
  77         return hz_internal;
  78 }
  79
  80 static int FAST_FUNC print_route(const struct sockaddr_nl *who UNUSED_PARAM,
  81                 struct nlmsghdr *n, void *arg UNUSED_PARAM)
  82 {
  83         struct rtmsg *r = NLMSG_DATA(n);
  84         int len = n->nlmsg_len;
  85         struct rtattr * tb[RTA_MAX+1];
  86         char abuf[256];
  87         inet_prefix dst;
  88         inet_prefix src;
  89         int host_len = -1;
  90         SPRINT_BUF(b1);
  91
  92         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
  93                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
  94                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  95                 return 0;
  96         }
  97         if (G_filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
  98                 return 0;
  99         len -= NLMSG_LENGTH(sizeof(*r));
 100         if (len < 0)
 101                 bb_error_msg_and_die("wrong nlmsg len %d", len);
 102
 103         if (r->rtm_family == AF_INET6)
 104                 host_len = 128;
 105         else if (r->rtm_family == AF_INET)
 106                 host_len = 32;
 107
 108         if (r->rtm_family == AF_INET6) {
 109                 if (G_filter.tb) {
 110                         if (G_filter.tb < 0) {
 111                                 if (!(r->rtm_flags & RTM_F_CLONED)) {
 112                                         return 0;
 113                                 }
 114                         } else {
 115                                 if (r->rtm_flags & RTM_F_CLONED) {
 116                                         return 0;
 117                                 }
 118                                 if (G_filter.tb == RT_TABLE_LOCAL) {
 119                                         if (r->rtm_type != RTN_LOCAL) {
 120                                                 return 0;
 121                                         }
 122                                 } else if (G_filter.tb == RT_TABLE_MAIN) {
 123                                         if (r->rtm_type == RTN_LOCAL) {
 124                                                 return 0;
 125                                         }
 126                                 } else {
 127                                         return 0;
 128                                 }
 129                         }
 130                 }
 131         } else {
 132                 if (G_filter.tb > 0 && G_filter.tb != r->rtm_table) {
 133                         return 0;
 134                 }
 135         }
 136         if (G_filter.rdst.family
 137          && (r->rtm_family != G_filter.rdst.family || G_filter.rdst.bitlen > r->rtm_dst_len)
 138         ) {
 139                 return 0;
 140         }
 141         if (G_filter.mdst.family
 142          && (r->rtm_family != G_filter.mdst.family
 143             || (G_filter.mdst.bitlen >= 0 && G_filter.mdst.bitlen < r->rtm_dst_len)
 144             )
 145         ) {
 146                 return 0;
 147         }
 148         if (G_filter.rsrc.family
 149          && (r->rtm_family != G_filter.rsrc.family || G_filter.rsrc.bitlen > r->rtm_src_len)
 150         ) {
 151                 return 0;
 152         }
 153         if (G_filter.msrc.family
 154          && (r->rtm_family != G_filter.msrc.family
 155             || (G_filter.msrc.bitlen >= 0 && G_filter.msrc.bitlen < r->rtm_src_len)
 156             )
 157         ) {
 158                 return 0;
 159         }
 160
 161         memset(tb, 0, sizeof(tb));
 162         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 163
 164         if (G_filter.rdst.family
 165          && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
 166         ) {
 167                 return 0;
 168         }
 169         if (G_filter.mdst.family
 170          && G_filter.mdst.bitlen >= 0
 171          && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
 172         ) {
 173                 return 0;
 174         }
 175         if (G_filter.rsrc.family
 176          && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
 177         ) {
 178                 return 0;
 179         }
 180         if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
 181          && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
 182         ) {
 183                 return 0;
 184         }
 185         if (G_filter.oif != 0) {
 186                 if (!tb[RTA_OIF])
 187                         return 0;
 188                 if (G_filter.oif != *(int*)RTA_DATA(tb[RTA_OIF]))
 189                         return 0;
 190         }
 191
 192         if (G_filter.flushb) {
 193                 struct nlmsghdr *fn;
 194
 195                 /* We are creating route flush commands */
 196
 197                 if (r->rtm_family == AF_INET6
 198                  && r->rtm_dst_len == 0
 199                  && r->rtm_type == RTN_UNREACHABLE
 200                  && tb[RTA_PRIORITY]
 201                  && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
 202                 ) {
 203                         return 0;
 204                 }
 205
 206                 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
 207                         if (flush_update())
 208                                 bb_error_msg_and_die("flush");
 209                 }
 210                 fn = (void*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
 211                 memcpy(fn, n, n->nlmsg_len);
 212                 fn->nlmsg_type = RTM_DELROUTE;
 213                 fn->nlmsg_flags = NLM_F_REQUEST;
 214                 fn->nlmsg_seq = ++G_filter.rth->seq;
 215                 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
 216                 G_filter.flushed = 1;
 217                 return 0;
 218         }
 219
 220         /* We are printing routes */
 221
 222         if (n->nlmsg_type == RTM_DELROUTE) {
 223                 printf("Deleted ");
 224         }
 225         if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
 226                 printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
 227         }
 228
 229         if (tb[RTA_DST]) {
 230                 if (r->rtm_dst_len != host_len) {
 231                         printf("%s/%u ", rt_addr_n2a(r->rtm_family,
 232                                                 RTA_DATA(tb[RTA_DST]),
 233                                                 abuf, sizeof(abuf)),
 234                                         r->rtm_dst_len
 235                                         );
 236                 } else {
 237                         printf("%s ", format_host(r->rtm_family,
 238                                                 RTA_PAYLOAD(tb[RTA_DST]),
 239                                                 RTA_DATA(tb[RTA_DST]),
 240                                                 abuf, sizeof(abuf))
 241                                         );
 242                 }
 243         } else if (r->rtm_dst_len) {
 244                 printf("0/%d ", r->rtm_dst_len);
 245         } else {
 246                 printf("default ");
 247         }
 248         if (tb[RTA_SRC]) {
 249                 if (r->rtm_src_len != host_len) {
 250                         printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
 251                                                 RTA_DATA(tb[RTA_SRC]),
 252                                                 abuf, sizeof(abuf)),
 253                                         r->rtm_src_len
 254                                         );
 255                 } else {
 256                         printf("from %s ", format_host(r->rtm_family,
 257                                                 RTA_PAYLOAD(tb[RTA_SRC]),
 258                                                 RTA_DATA(tb[RTA_SRC]),
 259                                                 abuf, sizeof(abuf))
 260                                         );
 261                 }
 262         } else if (r->rtm_src_len) {
 263                 printf("from 0/%u ", r->rtm_src_len);
 264         }
 265         if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
 266                 printf("via %s ", format_host(r->rtm_family,
 267                                         RTA_PAYLOAD(tb[RTA_GATEWAY]),
 268                                         RTA_DATA(tb[RTA_GATEWAY]),
 269                                         abuf, sizeof(abuf)));
 270         }
 271         if (tb[RTA_OIF]) {
 272                 printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 273         }
 274
 275         /* Todo: parse & show "proto kernel", "scope link" here */
 276
 277         if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
 278                 /* Do not use format_host(). It is our local addr
 279                    and symbolic name will not be useful.
 280                  */
 281                 printf(" src %s ", rt_addr_n2a(r->rtm_family,
 282                                         RTA_DATA(tb[RTA_PREFSRC]),
 283                                         abuf, sizeof(abuf)));
 284         }
 285         if (tb[RTA_PRIORITY]) {
 286                 printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
 287         }
 288         if (r->rtm_family == AF_INET6) {
 289                 struct rta_cacheinfo *ci = NULL;
 290                 if (tb[RTA_CACHEINFO]) {
 291                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 292                 }
 293                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 294                         if (r->rtm_flags & RTM_F_CLONED) {
 295                                 printf("%c    cache ", _SL_);
 296                         }
 297                         if (ci->rta_expires) {
 298                                 printf(" expires %dsec", ci->rta_expires / get_hz());
 299                         }
 300                         if (ci->rta_error != 0) {
 301                                 printf(" error %d", ci->rta_error);
 302                         }
 303                 } else if (ci) {
 304                         if (ci->rta_error != 0)
 305                                 printf(" error %d", ci->rta_error);
 306                 }
 307         }
 308         if (tb[RTA_IIF] && G_filter.iif == 0) {
 309                 printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 310         }
 311         bb_putchar('\n');
 312         return 0;
 313 }
 314
 315 /* Return value becomes exitcode. It's okay to not return at all */
 316 static int iproute_modify(int cmd, unsigned flags, char **argv)
 317 {
 318         static const char keywords[] ALIGN1 =
 319                 "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
 320                 "dev\0""oif\0""to\0""metric\0";
 321         enum {
 322                 ARG_src,
 323                 ARG_via,
 324                 ARG_mtu, PARM_lock,
 325                 ARG_protocol,
 326 IF_FEATURE_IP_RULE(ARG_table,)
 327                 ARG_dev,
 328                 ARG_oif,
 329                 ARG_to,
 330                 ARG_metric,
 331         };
 332         enum {
 333                 gw_ok = 1 << 0,
 334                 dst_ok = 1 << 1,
 335                 proto_ok = 1 << 2,
 336                 type_ok = 1 << 3
 337         };
 338         struct rtnl_handle rth;
 339         struct {
 340                 struct nlmsghdr n;
 341                 struct rtmsg    r;
 342                 char            buf[1024];
 343         } req;
 344         char mxbuf[256];
 345         struct rtattr * mxrta = (void*)mxbuf;
 346         unsigned mxlock = 0;
 347         char *d = NULL;
 348         smalluint ok = 0;
 349         int arg;
 350
 351         memset(&req, 0, sizeof(req));
 352
 353         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 354         req.n.nlmsg_flags = NLM_F_REQUEST | flags;
 355         req.n.nlmsg_type = cmd;
 356         req.r.rtm_family = preferred_family;
 357         if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
 358                 req.r.rtm_table = RT_TABLE_MAIN;
 359         if (RT_SCOPE_NOWHERE)
 360                 req.r.rtm_scope = RT_SCOPE_NOWHERE;
 361
 362         if (cmd != RTM_DELROUTE) {
 363                 req.r.rtm_protocol = RTPROT_BOOT;
 364                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 365                 req.r.rtm_type = RTN_UNICAST;
 366         }
 367
 368         mxrta->rta_type = RTA_METRICS;
 369         mxrta->rta_len = RTA_LENGTH(0);
 370
 371         while (*argv) {
 372                 arg = index_in_substrings(keywords, *argv);
 373                 if (arg == ARG_src) {
 374                         inet_prefix addr;
 375                         NEXT_ARG();
 376                         get_addr(&addr, *argv, req.r.rtm_family);
 377                         if (req.r.rtm_family == AF_UNSPEC)
 378                                 req.r.rtm_family = addr.family;
 379                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 380                 } else if (arg == ARG_via) {
 381                         inet_prefix addr;
 382                         ok |= gw_ok;
 383                         NEXT_ARG();
 384                         get_addr(&addr, *argv, req.r.rtm_family);
 385                         if (req.r.rtm_family == AF_UNSPEC) {
 386                                 req.r.rtm_family = addr.family;
 387                         }
 388                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 389                 } else if (arg == ARG_mtu) {
 390                         unsigned mtu;
 391                         NEXT_ARG();
 392                         if (index_in_strings(keywords, *argv) == PARM_lock) {
 393                                 mxlock |= (1 << RTAX_MTU);
 394                                 NEXT_ARG();
 395                         }
 396                         mtu = get_unsigned(*argv, "mtu");
 397                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 398                 } else if (arg == ARG_protocol) {
 399                         uint32_t prot;
 400                         NEXT_ARG();
 401                         if (rtnl_rtprot_a2n(&prot, *argv))
 402                                 invarg(*argv, "protocol");
 403                         req.r.rtm_protocol = prot;
 404                         ok |= proto_ok;
 405 #if ENABLE_FEATURE_IP_RULE
 406                 } else if (arg == ARG_table) {
 407                         uint32_t tid;
 408                         NEXT_ARG();
 409                         if (rtnl_rttable_a2n(&tid, *argv))
 410                                 invarg(*argv, "table");
 411                         req.r.rtm_table = tid;
 412 #endif
 413                 } else if (arg == ARG_dev || arg == ARG_oif) {
 414                         NEXT_ARG();
 415                         d = *argv;
 416                 } else if (arg == ARG_metric) {
 417                         uint32_t metric;
 418                         NEXT_ARG();
 419                         metric = get_u32(*argv, "metric");
 420                         addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
 421                 } else {
 422                         int type;
 423                         inet_prefix dst;
 424
 425                         if (arg == ARG_to) {
 426                                 NEXT_ARG();
 427                         }
 428                         if ((**argv < '0' || **argv > '9')
 429                          && rtnl_rtntype_a2n(&type, *argv) == 0) {
 430                                 NEXT_ARG();
 431                                 req.r.rtm_type = type;
 432                                 ok |= type_ok;
 433                         }
 434
 435                         if (ok & dst_ok) {
 436                                 duparg2("to", *argv);
 437                         }
 438                         get_prefix(&dst, *argv, req.r.rtm_family);
 439                         if (req.r.rtm_family == AF_UNSPEC) {
 440                                 req.r.rtm_family = dst.family;
 441                         }
 442                         req.r.rtm_dst_len = dst.bitlen;
 443                         ok |= dst_ok;
 444                         if (dst.bytelen) {
 445                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 446                         }
 447                 }
 448                 argv++;
 449         }
 450
 451         xrtnl_open(&rth);
 452
 453         if (d)  {
 454                 int idx;
 455
 456                 ll_init_map(&rth);
 457
 458                 if (d) {
 459                         idx = xll_name_to_index(d);
 460                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 461                 }
 462         }
 463
 464         if (mxrta->rta_len > RTA_LENGTH(0)) {
 465                 if (mxlock) {
 466                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 467                 }
 468                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 469         }
 470
 471         if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
 472                 req.r.rtm_scope = RT_SCOPE_HOST;
 473         else
 474         if (req.r.rtm_type == RTN_BROADCAST
 475          || req.r.rtm_type == RTN_MULTICAST
 476          || req.r.rtm_type == RTN_ANYCAST
 477         ) {
 478                 req.r.rtm_scope = RT_SCOPE_LINK;
 479         }
 480         else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
 481                 if (cmd == RTM_DELROUTE)
 482                         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 483                 else if (!(ok & gw_ok))
 484                         req.r.rtm_scope = RT_SCOPE_LINK;
 485         }
 486
 487         if (req.r.rtm_family == AF_UNSPEC) {
 488                 req.r.rtm_family = AF_INET;
 489         }
 490
 491         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 492                 return 2;
 493         }
 494
 495         return 0;
 496 }
 497
 498 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 499 {
 500         struct {
 501                 struct nlmsghdr nlh;
 502                 struct rtmsg rtm;
 503         } req;
 504         struct sockaddr_nl nladdr;
 505
 506         memset(&nladdr, 0, sizeof(nladdr));
 507         memset(&req, 0, sizeof(req));
 508         nladdr.nl_family = AF_NETLINK;
 509
 510         req.nlh.nlmsg_len = sizeof(req);
 511         if (RTM_GETROUTE)
 512                 req.nlh.nlmsg_type = RTM_GETROUTE;
 513         if (NLM_F_ROOT | NLM_F_REQUEST)
 514                 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
 515         /*req.nlh.nlmsg_pid = 0; - memset did it already */
 516         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
 517         req.rtm.rtm_family = family;
 518         if (RTM_F_CLONED)
 519                 req.rtm.rtm_flags = RTM_F_CLONED;
 520
 521         return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
 522 }
 523
 524 static void iproute_flush_cache(void)
 525 {
 526         static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
 527         int flush_fd = open_or_warn(fn, O_WRONLY);
 528
 529         if (flush_fd < 0) {
 530                 return;
 531         }
 532
 533         if (write(flush_fd, "-1", 2) < 2) {
 534                 bb_perror_msg("can't flush routing cache");
 535                 return;
 536         }
 537         close(flush_fd);
 538 }
 539
 540 static void iproute_reset_filter(void)
 541 {
 542         memset(&G_filter, 0, sizeof(G_filter));
 543         G_filter.mdst.bitlen = -1;
 544         G_filter.msrc.bitlen = -1;
 545 }
 546
 547 /* Return value becomes exitcode. It's okay to not return at all */
 548 static int iproute_list_or_flush(char **argv, int flush)
 549 {
 550         int do_ipv6 = preferred_family;
 551         struct rtnl_handle rth;
 552         char *id = NULL;
 553         char *od = NULL;
 554         static const char keywords[] ALIGN1 =
 555                 /* "ip route list/flush" parameters: */
 556                 "protocol\0" "dev\0"   "oif\0"   "iif\0"
 557                 "via\0"      "table\0" "cache\0"
 558                 "from\0"     "to\0"
 559                 /* and possible further keywords */
 560                 "all\0"
 561                 "root\0"
 562                 "match\0"
 563                 "exact\0"
 564                 "main\0"
 565                 ;
 566         enum {
 567                 KW_proto, KW_dev,   KW_oif,  KW_iif,
 568                 KW_via,   KW_table, KW_cache,
 569                 KW_from,  KW_to,
 570                 /* */
 571                 KW_all,
 572                 KW_root,
 573                 KW_match,
 574                 KW_exact,
 575                 KW_main,
 576         };
 577         int arg, parm;
 578
 579         iproute_reset_filter();
 580         G_filter.tb = RT_TABLE_MAIN;
 581
 582         if (flush && !*argv)
 583                 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
 584
 585         while (*argv) {
 586                 arg = index_in_substrings(keywords, *argv);
 587                 if (arg == KW_proto) {
 588                         uint32_t prot = 0;
 589                         NEXT_ARG();
 590                         //G_filter.protocolmask = -1;
 591                         if (rtnl_rtprot_a2n(&prot, *argv)) {
 592                                 if (index_in_strings(keywords, *argv) != KW_all)
 593                                         invarg(*argv, "protocol");
 594                                 prot = 0;
 595                                 //G_filter.protocolmask = 0;
 596                         }
 597                         //G_filter.protocol = prot;
 598                 } else if (arg == KW_dev || arg == KW_oif) {
 599                         NEXT_ARG();
 600                         od = *argv;
 601                 } else if (arg == KW_iif) {
 602                         NEXT_ARG();
 603                         id = *argv;
 604                 } else if (arg == KW_via) {
 605                         NEXT_ARG();
 606                         get_prefix(&G_filter.rvia, *argv, do_ipv6);
 607                 } else if (arg == KW_table) { /* table all/cache/main */
 608                         NEXT_ARG();
 609                         parm = index_in_substrings(keywords, *argv);
 610                         if (parm == KW_cache)
 611                                 G_filter.tb = -1;
 612                         else if (parm == KW_all)
 613                                 G_filter.tb = 0;
 614                         else if (parm != KW_main) {
 615 #if ENABLE_FEATURE_IP_RULE
 616                                 uint32_t tid;
 617                                 if (rtnl_rttable_a2n(&tid, *argv))
 618                                         invarg(*argv, "table");
 619                                 G_filter.tb = tid;
 620 #else
 621                                 invarg(*argv, "table");
 622 #endif
 623                         }
 624                 } else if (arg == KW_cache) {
 625                         /* The command 'ip route flush cache' is used by OpenSWAN.
 626                          * Assuming it's a synonym for 'ip route flush table cache' */
 627                         G_filter.tb = -1;
 628                 } else if (arg == KW_from) {
 629                         NEXT_ARG();
 630                         parm = index_in_substrings(keywords, *argv);
 631                         if (parm == KW_root) {
 632                                 NEXT_ARG();
 633                                 get_prefix(&G_filter.rsrc, *argv, do_ipv6);
 634                         } else if (parm == KW_match) {
 635                                 NEXT_ARG();
 636                                 get_prefix(&G_filter.msrc, *argv, do_ipv6);
 637                         } else {
 638                                 if (parm == KW_exact)
 639                                         NEXT_ARG();
 640                                 get_prefix(&G_filter.msrc, *argv, do_ipv6);
 641                                 G_filter.rsrc = G_filter.msrc;
 642                         }
 643                 } else { /* "to" is the default parameter */
 644                         if (arg == KW_to) {
 645                                 NEXT_ARG();
 646                                 arg = index_in_substrings(keywords, *argv);
 647                         }
 648                         /* parm = arg; - would be more plausible, but we reuse 'arg' here */
 649                         if (arg == KW_root) {
 650                                 NEXT_ARG();
 651                                 get_prefix(&G_filter.rdst, *argv, do_ipv6);
 652                         } else if (arg == KW_match) {
 653                                 NEXT_ARG();
 654                                 get_prefix(&G_filter.mdst, *argv, do_ipv6);
 655                         } else { /* "to exact" is the default */
 656                                 if (arg == KW_exact)
 657                                         NEXT_ARG();
 658                                 get_prefix(&G_filter.mdst, *argv, do_ipv6);
 659                                 G_filter.rdst = G_filter.mdst;
 660                         }
 661                 }
 662                 argv++;
 663         }
 664
 665         if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
 666                 do_ipv6 = AF_INET;
 667         }
 668
 669         xrtnl_open(&rth);
 670         ll_init_map(&rth);
 671
 672         if (id || od)  {
 673                 int idx;
 674
 675                 if (id) {
 676                         idx = xll_name_to_index(id);
 677                         G_filter.iif = idx;
 678                 }
 679                 if (od) {
 680                         idx = xll_name_to_index(od);
 681                         G_filter.oif = idx;
 682                 }
 683         }
 684
 685         if (flush) {
 686                 char flushb[4096-512];
 687
 688                 if (G_filter.tb == -1) { /* "flush table cache" */
 689                         if (do_ipv6 != AF_INET6)
 690                                 iproute_flush_cache();
 691                         if (do_ipv6 == AF_INET)
 692                                 return 0;
 693                 }
 694
 695                 G_filter.flushb = flushb;
 696                 G_filter.flushp = 0;
 697                 G_filter.flushe = sizeof(flushb);
 698                 G_filter.rth = &rth;
 699
 700                 for (;;) {
 701                         xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
 702                         G_filter.flushed = 0;
 703                         xrtnl_dump_filter(&rth, print_route, NULL);
 704                         if (G_filter.flushed == 0)
 705                                 return 0;
 706                         if (flush_update())
 707                                 return 1;
 708                 }
 709         }
 710
 711         if (G_filter.tb != -1) {
 712                 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
 713         } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
 714                 bb_perror_msg_and_die("can't send dump request");
 715         }
 716         xrtnl_dump_filter(&rth, print_route, NULL);
 717
 718         return 0;
 719 }
 720
 721
 722 /* Return value becomes exitcode. It's okay to not return at all */
 723 static int iproute_get(char **argv)
 724 {
 725         struct rtnl_handle rth;
 726         struct {
 727                 struct nlmsghdr n;
 728                 struct rtmsg    r;
 729                 char            buf[1024];
 730         } req;
 731         char *idev = NULL;
 732         char *odev = NULL;
 733         bool connected = 0;
 734         bool from_ok = 0;
 735         static const char options[] ALIGN1 =
 736                 "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
 737
 738         memset(&req, 0, sizeof(req));
 739
 740         iproute_reset_filter();
 741
 742         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 743         if (NLM_F_REQUEST)
 744                 req.n.nlmsg_flags = NLM_F_REQUEST;
 745         if (RTM_GETROUTE)
 746                 req.n.nlmsg_type = RTM_GETROUTE;
 747         req.r.rtm_family = preferred_family;
 748         /*req.r.rtm_table = 0; - memset did this already */
 749         /*req.r.rtm_protocol = 0;*/
 750         /*req.r.rtm_scope = 0;*/
 751         /*req.r.rtm_type = 0;*/
 752         /*req.r.rtm_src_len = 0;*/
 753         /*req.r.rtm_dst_len = 0;*/
 754         /*req.r.rtm_tos = 0;*/
 755
 756         while (*argv) {
 757                 switch (index_in_strings(options, *argv)) {
 758                         case 0: /* from */
 759                         {
 760                                 inet_prefix addr;
 761                                 NEXT_ARG();
 762                                 from_ok = 1;
 763                                 get_prefix(&addr, *argv, req.r.rtm_family);
 764                                 if (req.r.rtm_family == AF_UNSPEC) {
 765                                         req.r.rtm_family = addr.family;
 766                                 }
 767                                 if (addr.bytelen) {
 768                                         addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 769                                 }
 770                                 req.r.rtm_src_len = addr.bitlen;
 771                                 break;
 772                         }
 773                         case 1: /* iif */
 774                                 NEXT_ARG();
 775                                 idev = *argv;
 776                                 break;
 777                         case 2: /* oif */
 778                         case 3: /* dev */
 779                                 NEXT_ARG();
 780                                 odev = *argv;
 781                                 break;
 782                         case 4: /* notify */
 783                                 req.r.rtm_flags |= RTM_F_NOTIFY;
 784                                 break;
 785                         case 5: /* connected */
 786                                 connected = 1;
 787                                 break;
 788                         case 6: /* to */
 789                                 NEXT_ARG();
 790                         default:
 791                         {
 792                                 inet_prefix addr;
 793                                 get_prefix(&addr, *argv, req.r.rtm_family);
 794                                 if (req.r.rtm_family == AF_UNSPEC) {
 795                                         req.r.rtm_family = addr.family;
 796                                 }
 797                                 if (addr.bytelen) {
 798                                         addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
 799                                 }
 800                                 req.r.rtm_dst_len = addr.bitlen;
 801                         }
 802                 }
 803                 argv++;
 804         }
 805
 806         if (req.r.rtm_dst_len == 0) {
 807                 bb_error_msg_and_die("need at least destination address");
 808         }
 809
 810         xrtnl_open(&rth);
 811
 812         ll_init_map(&rth);
 813
 814         if (idev || odev)  {
 815                 int idx;
 816
 817                 if (idev) {
 818                         idx = xll_name_to_index(idev);
 819                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
 820                 }
 821                 if (odev) {
 822                         idx = xll_name_to_index(odev);
 823                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 824                 }
 825         }
 826
 827         if (req.r.rtm_family == AF_UNSPEC) {
 828                 req.r.rtm_family = AF_INET;
 829         }
 830
 831         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 832                 return 2;
 833         }
 834
 835         if (connected && !from_ok) {
 836                 struct rtmsg *r = NLMSG_DATA(&req.n);
 837                 int len = req.n.nlmsg_len;
 838                 struct rtattr * tb[RTA_MAX+1];
 839
 840                 print_route(NULL, &req.n, NULL);
 841
 842                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
 843                         bb_error_msg_and_die("not a route?");
 844                 }
 845                 len -= NLMSG_LENGTH(sizeof(*r));
 846                 if (len < 0) {
 847                         bb_error_msg_and_die("wrong len %d", len);
 848                 }
 849
 850                 memset(tb, 0, sizeof(tb));
 851                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 852
 853                 if (tb[RTA_PREFSRC]) {
 854                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
 855                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
 856                 } else if (!tb[RTA_SRC]) {
 857                         bb_error_msg_and_die("can't connect the route");
 858                 }
 859                 if (!odev && tb[RTA_OIF]) {
 860                         tb[RTA_OIF]->rta_type = 0;
 861                 }
 862                 if (tb[RTA_GATEWAY]) {
 863                         tb[RTA_GATEWAY]->rta_type = 0;
 864                 }
 865                 if (!idev && tb[RTA_IIF]) {
 866                         tb[RTA_IIF]->rta_type = 0;
 867                 }
 868                 req.n.nlmsg_flags = NLM_F_REQUEST;
 869                 req.n.nlmsg_type = RTM_GETROUTE;
 870
 871                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 872                         return 2;
 873                 }
 874         }
 875         print_route(NULL, &req.n, NULL);
 876         return 0;
 877 }
 878
 879 /* Return value becomes exitcode. It's okay to not return at all */
 880 int FAST_FUNC do_iproute(char **argv)
 881 {
 882         static const char ip_route_commands[] ALIGN1 =
 883         /*0-3*/ "add\0""append\0""change\0""chg\0"
 884         /*4-7*/ "delete\0""get\0""list\0""show\0"
 885         /*8..*/ "prepend\0""replace\0""test\0""flush\0";
 886         int command_num;
 887         unsigned flags = 0;
 888         int cmd = RTM_NEWROUTE;
 889
 890         if (!*argv)
 891                 return iproute_list_or_flush(argv, 0);
 892
 893         /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
 894         /* It probably means that it is using "first match" rule */
 895         command_num = index_in_substrings(ip_route_commands, *argv);
 896
 897         switch (command_num) {
 898                 case 0: /* add */
 899                         flags = NLM_F_CREATE|NLM_F_EXCL;
 900                         break;
 901                 case 1: /* append */
 902                         flags = NLM_F_CREATE|NLM_F_APPEND;
 903                         break;
 904                 case 2: /* change */
 905                 case 3: /* chg */
 906                         flags = NLM_F_REPLACE;
 907                         break;
 908                 case 4: /* delete */
 909                         cmd = RTM_DELROUTE;
 910                         break;
 911                 case 5: /* get */
 912                         return iproute_get(argv+1);
 913                 case 6: /* list */
 914                 case 7: /* show */
 915                         return iproute_list_or_flush(argv+1, 0);
 916                 case 8: /* prepend */
 917                         flags = NLM_F_CREATE;
 918                         break;
 919                 case 9: /* replace */
 920                         flags = NLM_F_CREATE|NLM_F_REPLACE;
 921                         break;
 922                 case 10: /* test */
 923                         flags = NLM_F_EXCL;
 924                         break;
 925                 case 11: /* flush */
 926                         return iproute_list_or_flush(argv+1, 1);
 927                 default:
 928                         bb_error_msg_and_die("unknown command %s", *argv);
 929         }
 930
 931         return iproute_modify(cmd, flags, argv+1);
 932 }