networking/libiproute/iproute.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * iproute.c            "ip route".
   4  *
   5  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
   6  *
   7  * Authors:     Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
   8  *
   9  *
  10  * Changes:
  11  *
  12  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  13  * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
  14  */
  15
  16 #include "libbb.h"
  17
  18 #include "rt_names.h"
  19 #include "utils.h"
  20 #include "ip_common.h"
  21
  22 #ifndef RTAX_RTTVAR
  23 #define RTAX_RTTVAR RTAX_HOPS
  24 #endif
  25
  26
  27 static struct
  28 {
  29         int tb;
  30         int flushed;
  31         char *flushb;
  32         int flushp;
  33         int flushe;
  34         struct rtnl_handle *rth;
  35         int protocol, protocolmask;
  36         int scope, scopemask;
  37         int type, typemask;
  38         int tos, tosmask;
  39         int iif, iifmask;
  40         int oif, oifmask;
  41         int realm, realmmask;
  42         inet_prefix rprefsrc;
  43         inet_prefix rvia;
  44         inet_prefix rdst;
  45         inet_prefix mdst;
  46         inet_prefix rsrc;
  47         inet_prefix msrc;
  48 } filter;
  49
  50 static int flush_update(void)
  51 {
  52         if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
  53                 perror("Failed to send flush request\n");
  54                 return -1;
  55         }
  56         filter.flushp = 0;
  57         return 0;
  58 }
  59
  60 static unsigned get_hz(void)
  61 {
  62         static unsigned hz_internal;
  63         FILE *fp;
  64
  65         if (hz_internal)
  66                 return hz_internal;
  67
  68         fp = fopen("/proc/net/psched", "r");
  69         if (fp) {
  70                 unsigned nom, denom;
  71
  72                 if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2)
  73                         if (nom == 1000000)
  74                                 hz_internal = denom;
  75                 fclose(fp);
  76         }
  77         if (!hz_internal)
  78                 hz_internal = sysconf(_SC_CLK_TCK);
  79         return hz_internal;
  80 }
  81
  82 static int print_route(struct sockaddr_nl *who ATTRIBUTE_UNUSED,
  83                 struct nlmsghdr *n, void *arg)
  84 {
  85         FILE *fp = (FILE*)arg;
  86         struct rtmsg *r = NLMSG_DATA(n);
  87         int len = n->nlmsg_len;
  88         struct rtattr * tb[RTA_MAX+1];
  89         char abuf[256];
  90         inet_prefix dst;
  91         inet_prefix src;
  92         int host_len = -1;
  93         SPRINT_BUF(b1);
  94
  95
  96         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
  97                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
  98                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  99                 return 0;
 100         }
 101         if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
 102                 return 0;
 103         len -= NLMSG_LENGTH(sizeof(*r));
 104         if (len < 0) {
 105                 bb_error_msg("wrong nlmsg len %d", len);
 106                 return -1;
 107         }
 108
 109         if (r->rtm_family == AF_INET6)
 110                 host_len = 128;
 111         else if (r->rtm_family == AF_INET)
 112                 host_len = 32;
 113
 114         if (r->rtm_family == AF_INET6) {
 115                 if (filter.tb) {
 116                         if (filter.tb < 0) {
 117                                 if (!(r->rtm_flags&RTM_F_CLONED)) {
 118                                         return 0;
 119                                 }
 120                         } else {
 121                                 if (r->rtm_flags&RTM_F_CLONED) {
 122                                         return 0;
 123                                 }
 124                                 if (filter.tb == RT_TABLE_LOCAL) {
 125                                         if (r->rtm_type != RTN_LOCAL) {
 126                                                 return 0;
 127                                         }
 128                                 } else if (filter.tb == RT_TABLE_MAIN) {
 129                                         if (r->rtm_type == RTN_LOCAL) {
 130                                                 return 0;
 131                                         }
 132                                 } else {
 133                                         return 0;
 134                                 }
 135                         }
 136                 }
 137         } else {
 138                 if (filter.tb > 0 && filter.tb != r->rtm_table) {
 139                         return 0;
 140                 }
 141         }
 142         if (filter.rdst.family &&
 143             (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) {
 144                 return 0;
 145         }
 146         if (filter.mdst.family &&
 147             (r->rtm_family != filter.mdst.family ||
 148              (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) {
 149                 return 0;
 150         }
 151         if (filter.rsrc.family &&
 152             (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) {
 153                 return 0;
 154         }
 155         if (filter.msrc.family &&
 156             (r->rtm_family != filter.msrc.family ||
 157              (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) {
 158                 return 0;
 159         }
 160
 161         memset(tb, 0, sizeof(tb));
 162         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 163
 164         if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
 165                 return 0;
 166         if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
 167             inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
 168                 return 0;
 169
 170         if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
 171                 return 0;
 172         if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
 173             inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
 174                 return 0;
 175
 176         if (filter.flushb &&
 177             r->rtm_family == AF_INET6 &&
 178             r->rtm_dst_len == 0 &&
 179             r->rtm_type == RTN_UNREACHABLE &&
 180             tb[RTA_PRIORITY] &&
 181             *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
 182                 return 0;
 183
 184         if (filter.flushb) {
 185                 struct nlmsghdr *fn;
 186                 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
 187                         if (flush_update())
 188                                 return -1;
 189                 }
 190                 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
 191                 memcpy(fn, n, n->nlmsg_len);
 192                 fn->nlmsg_type = RTM_DELROUTE;
 193                 fn->nlmsg_flags = NLM_F_REQUEST;
 194                 fn->nlmsg_seq = ++filter.rth->seq;
 195                 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
 196                 filter.flushed++;
 197                 return 0;
 198         }
 199
 200         if (n->nlmsg_type == RTM_DELROUTE) {
 201                 fprintf(fp, "Deleted ");
 202         }
 203         if (r->rtm_type != RTN_UNICAST && !filter.type) {
 204                 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
 205         }
 206
 207         if (tb[RTA_DST]) {
 208                 if (r->rtm_dst_len != host_len) {
 209                         fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
 210                                                          RTA_PAYLOAD(tb[RTA_DST]),
 211                                                          RTA_DATA(tb[RTA_DST]),
 212                                                          abuf, sizeof(abuf)),
 213                                 r->rtm_dst_len
 214                                 );
 215                 } else {
 216                         fprintf(fp, "%s ", format_host(r->rtm_family,
 217                                                        RTA_PAYLOAD(tb[RTA_DST]),
 218                                                        RTA_DATA(tb[RTA_DST]),
 219                                                        abuf, sizeof(abuf))
 220                                 );
 221                 }
 222         } else if (r->rtm_dst_len) {
 223                 fprintf(fp, "0/%d ", r->rtm_dst_len);
 224         } else {
 225                 fprintf(fp, "default ");
 226         }
 227         if (tb[RTA_SRC]) {
 228                 if (r->rtm_src_len != host_len) {
 229                         fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
 230                                                          RTA_PAYLOAD(tb[RTA_SRC]),
 231                                                          RTA_DATA(tb[RTA_SRC]),
 232                                                          abuf, sizeof(abuf)),
 233                                 r->rtm_src_len
 234                                 );
 235                 } else {
 236                         fprintf(fp, "from %s ", format_host(r->rtm_family,
 237                                                        RTA_PAYLOAD(tb[RTA_SRC]),
 238                                                        RTA_DATA(tb[RTA_SRC]),
 239                                                        abuf, sizeof(abuf))
 240                                 );
 241                 }
 242         } else if (r->rtm_src_len) {
 243                 fprintf(fp, "from 0/%u ", r->rtm_src_len);
 244         }
 245         if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
 246                 fprintf(fp, "via %s ",
 247                         format_host(r->rtm_family,
 248                                     RTA_PAYLOAD(tb[RTA_GATEWAY]),
 249                                     RTA_DATA(tb[RTA_GATEWAY]),
 250                                     abuf, sizeof(abuf)));
 251         }
 252         if (tb[RTA_OIF] && filter.oifmask != -1) {
 253                 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 254         }
 255
 256         if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
 257                 /* Do not use format_host(). It is our local addr
 258                    and symbolic name will not be useful.
 259                  */
 260                 fprintf(fp, " src %s ",
 261                         rt_addr_n2a(r->rtm_family,
 262                                     RTA_PAYLOAD(tb[RTA_PREFSRC]),
 263                                     RTA_DATA(tb[RTA_PREFSRC]),
 264                                     abuf, sizeof(abuf)));
 265         }
 266         if (tb[RTA_PRIORITY]) {
 267                 fprintf(fp, " metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
 268         }
 269         if (r->rtm_family == AF_INET6) {
 270                 struct rta_cacheinfo *ci = NULL;
 271                 if (tb[RTA_CACHEINFO]) {
 272                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 273                 }
 274                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 275                         if (r->rtm_flags & RTM_F_CLONED) {
 276                                 fprintf(fp, "%s    cache ", _SL_);
 277                         }
 278                         if (ci->rta_expires) {
 279                                 fprintf(fp, " expires %dsec", ci->rta_expires / get_hz());
 280                         }
 281                         if (ci->rta_error != 0) {
 282                                 fprintf(fp, " error %d", ci->rta_error);
 283                         }
 284                 } else if (ci) {
 285                         if (ci->rta_error != 0)
 286                                 fprintf(fp, " error %d", ci->rta_error);
 287                 }
 288         }
 289         if (tb[RTA_IIF] && filter.iifmask != -1) {
 290                 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 291         }
 292         fprintf(fp, "\n");
 293         fflush(fp);
 294         return 0;
 295 }
 296
 297 static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
 298 {
 299         struct rtnl_handle rth;
 300         struct {
 301                 struct nlmsghdr         n;
 302                 struct rtmsg            r;
 303                 char                    buf[1024];
 304         } req;
 305         char  mxbuf[256];
 306         struct rtattr * mxrta = (void*)mxbuf;
 307         unsigned mxlock = 0;
 308         char  *d = NULL;
 309         int gw_ok = 0;
 310         int dst_ok = 0;
 311         int proto_ok = 0;
 312         int type_ok = 0;
 313
 314         memset(&req, 0, sizeof(req));
 315
 316         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 317         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 318         req.n.nlmsg_type = cmd;
 319         req.r.rtm_family = preferred_family;
 320         req.r.rtm_table = RT_TABLE_MAIN;
 321         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 322
 323         if (cmd != RTM_DELROUTE) {
 324                 req.r.rtm_protocol = RTPROT_BOOT;
 325                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 326                 req.r.rtm_type = RTN_UNICAST;
 327         }
 328
 329         mxrta->rta_type = RTA_METRICS;
 330         mxrta->rta_len = RTA_LENGTH(0);
 331
 332         while (argc > 0) {
 333                 if (strcmp(*argv, "src") == 0) {
 334                         inet_prefix addr;
 335                         NEXT_ARG();
 336                         get_addr(&addr, *argv, req.r.rtm_family);
 337                         if (req.r.rtm_family == AF_UNSPEC) {
 338                                 req.r.rtm_family = addr.family;
 339                         }
 340                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 341                 } else if (strcmp(*argv, "via") == 0) {
 342                         inet_prefix addr;
 343                         gw_ok = 1;
 344                         NEXT_ARG();
 345                         get_addr(&addr, *argv, req.r.rtm_family);
 346                         if (req.r.rtm_family == AF_UNSPEC) {
 347                                 req.r.rtm_family = addr.family;
 348                         }
 349                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 350                 } else if (strcmp(*argv, "mtu") == 0) {
 351                         unsigned mtu;
 352                         NEXT_ARG();
 353                         if (strcmp(*argv, "lock") == 0) {
 354                                 mxlock |= (1<<RTAX_MTU);
 355                                 NEXT_ARG();
 356                         }
 357                         if (get_unsigned(&mtu, *argv, 0)) {
 358                                 invarg(*argv, "mtu");
 359                         }
 360                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 361                 } else if (matches(*argv, "protocol") == 0) {
 362                         uint32_t prot;
 363                         NEXT_ARG();
 364                         if (rtnl_rtprot_a2n(&prot, *argv))
 365                                 invarg(*argv, "protocol");
 366                         req.r.rtm_protocol = prot;
 367                         proto_ok =1;
 368 #if ENABLE_FEATURE_IP_RULE
 369                 } else if (matches(*argv, "table") == 0) {
 370                         uint32_t tid;
 371                         NEXT_ARG();
 372                         if (rtnl_rttable_a2n(&tid, *argv))
 373                                 invarg(*argv, "table");
 374                         req.r.rtm_table = tid;
 375 #endif
 376                 } else if (strcmp(*argv, "dev") == 0 ||
 377                            strcmp(*argv, "oif") == 0) {
 378                         NEXT_ARG();
 379                         d = *argv;
 380                 } else {
 381                         int type;
 382                         inet_prefix dst;
 383
 384                         if (strcmp(*argv, "to") == 0) {
 385                                 NEXT_ARG();
 386                         }
 387                         if ((**argv < '0' || **argv > '9') &&
 388                             rtnl_rtntype_a2n(&type, *argv) == 0) {
 389                                 NEXT_ARG();
 390                                 req.r.rtm_type = type;
 391                                 type_ok = 1;
 392                         }
 393
 394                         if (dst_ok) {
 395                                 duparg2("to", *argv);
 396                         }
 397                         get_prefix(&dst, *argv, req.r.rtm_family);
 398                         if (req.r.rtm_family == AF_UNSPEC) {
 399                                 req.r.rtm_family = dst.family;
 400                         }
 401                         req.r.rtm_dst_len = dst.bitlen;
 402                         dst_ok = 1;
 403                         if (dst.bytelen) {
 404                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 405                         }
 406                 }
 407                 argc--; argv++;
 408         }
 409
 410         if (rtnl_open(&rth, 0) < 0) {
 411                 exit(1);
 412         }
 413
 414         if (d)  {
 415                 int idx;
 416
 417                 ll_init_map(&rth);
 418
 419                 if (d) {
 420                         idx = ll_name_to_index(d);
 421                         if (idx == 0) {
 422                                 bb_error_msg("cannot find device \"%s\"", d);
 423                                 return -1;
 424                         }
 425                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 426                 }
 427         }
 428
 429         if (mxrta->rta_len > RTA_LENGTH(0)) {
 430                 if (mxlock) {
 431                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 432                 }
 433                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 434         }
 435
 436         if (req.r.rtm_family == AF_UNSPEC) {
 437                 req.r.rtm_family = AF_INET;
 438         }
 439
 440         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 441                 exit(2);
 442         }
 443
 444         return 0;
 445 }
 446
 447 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 448 {
 449         struct {
 450                 struct nlmsghdr nlh;
 451                 struct rtmsg rtm;
 452         } req;
 453         struct sockaddr_nl nladdr;
 454
 455         memset(&nladdr, 0, sizeof(nladdr));
 456         memset(&req, 0, sizeof(req));
 457         nladdr.nl_family = AF_NETLINK;
 458
 459         req.nlh.nlmsg_len = sizeof(req);
 460         req.nlh.nlmsg_type = RTM_GETROUTE;
 461         req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
 462         req.nlh.nlmsg_pid = 0;
 463         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
 464         req.rtm.rtm_family = family;
 465         req.rtm.rtm_flags |= RTM_F_CLONED;
 466
 467         return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
 468 }
 469
 470 static int iproute_flush_cache(void)
 471 {
 472 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
 473
 474         int len;
 475         int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
 476         char *buffer = "-1";
 477
 478         if (flush_fd < 0) {
 479                 fprintf(stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
 480                 return -1;
 481         }
 482
 483         len = strlen (buffer);
 484
 485         if ((write (flush_fd, (void *)buffer, len)) < len) {
 486                 fprintf(stderr, "Cannot flush routing cache\n");
 487                 return -1;
 488         }
 489         close(flush_fd);
 490         return 0;
 491 }
 492
 493 static void iproute_reset_filter(void)
 494 {
 495         memset(&filter, 0, sizeof(filter));
 496         filter.mdst.bitlen = -1;
 497         filter.msrc.bitlen = -1;
 498 }
 499
 500 static int iproute_list_or_flush(int argc, char **argv, int flush)
 501 {
 502         int do_ipv6 = preferred_family;
 503         struct rtnl_handle rth;
 504         char *id = NULL;
 505         char *od = NULL;
 506
 507         iproute_reset_filter();
 508         filter.tb = RT_TABLE_MAIN;
 509
 510         if (flush && argc <= 0) {
 511                 bb_error_msg(bb_msg_requires_arg, "\"ip route flush\"");
 512                 return -1;
 513         }
 514
 515         while (argc > 0) {
 516                 if (matches(*argv, "protocol") == 0) {
 517                         uint32_t prot = 0;
 518                         NEXT_ARG();
 519                         filter.protocolmask = -1;
 520                         if (rtnl_rtprot_a2n(&prot, *argv)) {
 521                                 if (strcmp(*argv, "all") != 0) {
 522                                         invarg(*argv, "protocol");
 523                                 }
 524                                 prot = 0;
 525                                 filter.protocolmask = 0;
 526                         }
 527                         filter.protocol = prot;
 528                 } else if (strcmp(*argv, "dev") == 0 ||
 529                            strcmp(*argv, "oif") == 0) {
 530                         NEXT_ARG();
 531                         od = *argv;
 532                 } else if (strcmp(*argv, "iif") == 0) {
 533                         NEXT_ARG();
 534                         id = *argv;
 535                 } else if (matches(*argv, "from") == 0) {
 536                         NEXT_ARG();
 537                         if (matches(*argv, "root") == 0) {
 538                                 NEXT_ARG();
 539                                 get_prefix(&filter.rsrc, *argv, do_ipv6);
 540                         } else if (matches(*argv, "match") == 0) {
 541                                 NEXT_ARG();
 542                                 get_prefix(&filter.msrc, *argv, do_ipv6);
 543                         } else {
 544                                 if (matches(*argv, "exact") == 0) {
 545                                         NEXT_ARG();
 546                                 }
 547                                 get_prefix(&filter.msrc, *argv, do_ipv6);
 548                                 filter.rsrc = filter.msrc;
 549                         }
 550                 } else {
 551                         if (matches(*argv, "to") == 0) {
 552                                 NEXT_ARG();
 553                         }
 554                         if (matches(*argv, "root") == 0) {
 555                                 NEXT_ARG();
 556                                 get_prefix(&filter.rdst, *argv, do_ipv6);
 557                         } else if (matches(*argv, "match") == 0) {
 558                                 NEXT_ARG();
 559                                 get_prefix(&filter.mdst, *argv, do_ipv6);
 560                         } else if (matches(*argv, "table") == 0) {
 561                                 NEXT_ARG();
 562                                 if (matches(*argv, "cache") == 0) {
 563                                         filter.tb = -1;
 564 #if 0 && ENABLE_FEATURE_IP_RULE
 565
 566 #else
 567                                 } else if (matches(*argv, "main") != 0) {
 568                                         invarg(*argv, "table");
 569                                 }
 570 #endif
 571                         } else if (matches(*argv, "cache") == 0) {
 572                                 filter.tb = -1;
 573                         } else {
 574                                 if (matches(*argv, "exact") == 0) {
 575                                         NEXT_ARG();
 576                                 }
 577                                 get_prefix(&filter.mdst, *argv, do_ipv6);
 578                                 filter.rdst = filter.mdst;
 579                         }
 580                 }
 581                 argc--; argv++;
 582         }
 583
 584         if (do_ipv6 == AF_UNSPEC && filter.tb) {
 585                 do_ipv6 = AF_INET;
 586         }
 587
 588         if (rtnl_open(&rth, 0) < 0) {
 589                 exit(1);
 590         }
 591
 592         ll_init_map(&rth);
 593
 594         if (id || od)  {
 595                 int idx;
 596
 597                 if (id) {
 598                         if ((idx = ll_name_to_index(id)) == 0) {
 599                                 bb_error_msg("cannot find device \"%s\"", id);
 600                                 return -1;
 601                         }
 602                         filter.iif = idx;
 603                         filter.iifmask = -1;
 604                 }
 605                 if (od) {
 606                         if ((idx = ll_name_to_index(od)) == 0) {
 607                                 bb_error_msg("cannot find device \"%s\"", od);
 608                         }
 609                         filter.oif = idx;
 610                         filter.oifmask = -1;
 611                 }
 612         }
 613
 614         if (flush) {
 615                 char flushb[4096-512];
 616
 617                 if (filter.tb == -1) {
 618                         if (do_ipv6 != AF_INET6)
 619                                 iproute_flush_cache();
 620                         if (do_ipv6 == AF_INET)
 621                                 return 0;
 622                 }
 623
 624                 filter.flushb = flushb;
 625                 filter.flushp = 0;
 626                 filter.flushe = sizeof(flushb);
 627                 filter.rth = &rth;
 628
 629                 for (;;) {
 630                         if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
 631                                 perror("Cannot send dump request");
 632                                 return -1;
 633                         }
 634                         filter.flushed = 0;
 635                         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
 636                                 bb_error_msg("flush terminated");
 637                                 return -1;
 638                         }
 639                         if (filter.flushed == 0) {
 640                                 fflush(stdout);
 641                                 return 0;
 642                         }
 643                         if (flush_update() < 0)
 644                                 exit(1);
 645                 }
 646         }
 647
 648         if (filter.tb != -1) {
 649                 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
 650                         bb_perror_msg_and_die("cannot send dump request");
 651                 }
 652         } else {
 653                 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
 654                         bb_perror_msg_and_die("cannot send dump request");
 655                 }
 656         }
 657
 658         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
 659                 bb_error_msg_and_die("dump terminated");
 660         }
 661
 662         exit(0);
 663 }
 664
 665
 666 static int iproute_get(int argc, char **argv)
 667 {
 668         struct rtnl_handle rth;
 669         struct {
 670                 struct nlmsghdr         n;
 671                 struct rtmsg            r;
 672                 char                    buf[1024];
 673         } req;
 674         char  *idev = NULL;
 675         char  *odev = NULL;
 676         int connected = 0;
 677         int from_ok = 0;
 678         static const char * const options[] =
 679                 { "from", "iif", "oif", "dev", "notify", "connected", "to", 0 };
 680
 681         memset(&req, 0, sizeof(req));
 682
 683         iproute_reset_filter();
 684
 685         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 686         req.n.nlmsg_flags = NLM_F_REQUEST;
 687         req.n.nlmsg_type = RTM_GETROUTE;
 688         req.r.rtm_family = preferred_family;
 689         req.r.rtm_table = 0;
 690         req.r.rtm_protocol = 0;
 691         req.r.rtm_scope = 0;
 692         req.r.rtm_type = 0;
 693         req.r.rtm_src_len = 0;
 694         req.r.rtm_dst_len = 0;
 695         req.r.rtm_tos = 0;
 696
 697         while (argc > 0) {
 698                 switch (index_in_str_array(options, *argv)) {
 699                         case 0: /* from */
 700                         {
 701                                 inet_prefix addr;
 702                                 NEXT_ARG();
 703                                 from_ok = 1;
 704                                 get_prefix(&addr, *argv, req.r.rtm_family);
 705                                 if (req.r.rtm_family == AF_UNSPEC) {
 706                                         req.r.rtm_family = addr.family;
 707                                 }
 708                                 if (addr.bytelen) {
 709                                         addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 710                                 }
 711                                 req.r.rtm_src_len = addr.bitlen;
 712                                 break;
 713                         }
 714                         case 1: /* iif */
 715                                 NEXT_ARG();
 716                                 idev = *argv;
 717                                 break;
 718                         case 2: /* oif */
 719                         case 3: /* dev */
 720                                 NEXT_ARG();
 721                                 odev = *argv;
 722                                 break;
 723                         case 4: /* notify */
 724                                 req.r.rtm_flags |= RTM_F_NOTIFY;
 725                                 break;
 726                         case 5: /* connected */
 727                                 connected = 1;
 728                                 break;
 729                         case 6: /* to */
 730                                 NEXT_ARG();
 731                         default:
 732                         {
 733                                 inet_prefix addr;
 734                                 get_prefix(&addr, *argv, req.r.rtm_family);
 735                                 if (req.r.rtm_family == AF_UNSPEC) {
 736                                         req.r.rtm_family = addr.family;
 737                                 }
 738                                 if (addr.bytelen) {
 739                                         addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
 740                                 }
 741                                 req.r.rtm_dst_len = addr.bitlen;
 742                         }
 743                         argc--; argv++;
 744                 }
 745         }
 746
 747         if (req.r.rtm_dst_len == 0) {
 748                 bb_error_msg_and_die("need at least destination address");
 749         }
 750
 751         if (rtnl_open(&rth, 0) < 0)
 752                 exit(1);
 753
 754         ll_init_map(&rth);
 755
 756         if (idev || odev)  {
 757                 int idx;
 758
 759                 if (idev) {
 760                         if ((idx = ll_name_to_index(idev)) == 0) {
 761                                 bb_error_msg("cannot find device \"%s\"", idev);
 762                                 return -1;
 763                         }
 764                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
 765                 }
 766                 if (odev) {
 767                         if ((idx = ll_name_to_index(odev)) == 0) {
 768                                 bb_error_msg("cannot find device \"%s\"", odev);
 769                                 return -1;
 770                         }
 771                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 772                 }
 773         }
 774
 775         if (req.r.rtm_family == AF_UNSPEC) {
 776                 req.r.rtm_family = AF_INET;
 777         }
 778
 779         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 780                 exit(2);
 781         }
 782
 783         if (connected && !from_ok) {
 784                 struct rtmsg *r = NLMSG_DATA(&req.n);
 785                 int len = req.n.nlmsg_len;
 786                 struct rtattr * tb[RTA_MAX+1];
 787
 788                 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
 789                         bb_error_msg_and_die("an error :-)");
 790                 }
 791
 792                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
 793                         bb_error_msg("not a route?");
 794                         return -1;
 795                 }
 796                 len -= NLMSG_LENGTH(sizeof(*r));
 797                 if (len < 0) {
 798                         bb_error_msg("wrong len %d", len);
 799                         return -1;
 800                 }
 801
 802                 memset(tb, 0, sizeof(tb));
 803                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 804
 805                 if (tb[RTA_PREFSRC]) {
 806                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
 807                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
 808                 } else if (!tb[RTA_SRC]) {
 809                         bb_error_msg("failed to connect the route");
 810                         return -1;
 811                 }
 812                 if (!odev && tb[RTA_OIF]) {
 813                         tb[RTA_OIF]->rta_type = 0;
 814                 }
 815                 if (tb[RTA_GATEWAY]) {
 816                         tb[RTA_GATEWAY]->rta_type = 0;
 817                 }
 818                 if (!idev && tb[RTA_IIF]) {
 819                         tb[RTA_IIF]->rta_type = 0;
 820                 }
 821                 req.n.nlmsg_flags = NLM_F_REQUEST;
 822                 req.n.nlmsg_type = RTM_GETROUTE;
 823
 824                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 825                         exit(2);
 826                 }
 827         }
 828
 829         if (print_route(NULL, &req.n, (void*)stdout) < 0) {
 830                 bb_error_msg_and_die("an error :-)");
 831         }
 832
 833         exit(0);
 834 }
 835
 836 int do_iproute(int argc, char **argv)
 837 {
 838         static const char * const ip_route_commands[] = {
 839         /*0-3*/ "add", "append", "change", "chg",
 840         /*4-7*/ "delete", "get", "list", "show",
 841         /*8..*/ "prepend", "replace", "test", "flush", 0
 842         };
 843         int command_num = 6;
 844         unsigned int flags = 0;
 845         int cmd = RTM_NEWROUTE;
 846
 847         /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
 848         /* It probably means that it is using "first match" rule */
 849         if (*argv) {
 850                 command_num = index_in_substr_array(ip_route_commands, *argv);
 851         }
 852         switch (command_num) {
 853                 case 0: /* add */
 854                         flags = NLM_F_CREATE|NLM_F_EXCL;
 855                         break;
 856                 case 1: /* append */
 857                         flags = NLM_F_CREATE|NLM_F_APPEND;
 858                         break;
 859                 case 2: /* change */
 860                 case 3: /* chg */
 861                         flags = NLM_F_REPLACE;
 862                         break;
 863                 case 4: /* delete */
 864                         cmd = RTM_DELROUTE;
 865                         break;
 866                 case 5: /* get */
 867                         return iproute_get(argc-1, argv+1);
 868                 case 6: /* list */
 869                 case 7: /* show */
 870                         return iproute_list_or_flush(argc-1, argv+1, 0);
 871                 case 8: /* prepend */
 872                         flags = NLM_F_CREATE;
 873                 case 9: /* replace */
 874                         flags = NLM_F_CREATE|NLM_F_REPLACE;
 875                 case 10: /* test */
 876                         flags = NLM_F_EXCL;
 877                 case 11: /* flush */
 878                         return iproute_list_or_flush(argc-1, argv+1, 1);
 879                 default:
 880                         bb_error_msg_and_die("unknown command %s", *argv);
 881         }
 882
 883         return iproute_modify(cmd, flags, argc-1, argv+1);
 884 }