busybox/networking/libiproute/iproute.c

   1 /*
   2  * iproute.c            "ip route".
   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  * Changes:
  13  *
  14  * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  15  * Kunihiro Ishiguro <kunihiro@zebra.org> 001102: rtnh_ifindex was not initialized
  16  */
  17
  18 #include <sys/socket.h>
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24
  25 #include "rt_names.h"
  26 #include "utils.h"
  27
  28 #include "libbb.h"
  29
  30 #ifndef RTAX_RTTVAR
  31 #define RTAX_RTTVAR RTAX_HOPS
  32 #endif
  33
  34
  35 static struct
  36 {
  37         int tb;
  38         int flushed;
  39         char *flushb;
  40         int flushp;
  41         int flushe;
  42         struct rtnl_handle *rth;
  43         int protocol, protocolmask;
  44         int scope, scopemask;
  45         int type, typemask;
  46         int tos, tosmask;
  47         int iif, iifmask;
  48         int oif, oifmask;
  49         int realm, realmmask;
  50         inet_prefix rprefsrc;
  51         inet_prefix rvia;
  52         inet_prefix rdst;
  53         inet_prefix mdst;
  54         inet_prefix rsrc;
  55         inet_prefix msrc;
  56 } filter;
  57
  58 static int flush_update(void)
  59 {
  60         if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) {
  61                 perror("Failed to send flush request\n");
  62                 return -1;
  63         }
  64         filter.flushp = 0;
  65         return 0;
  66 }
  67
  68 static int print_route(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
  69 {
  70         FILE *fp = (FILE*)arg;
  71         struct rtmsg *r = NLMSG_DATA(n);
  72         int len = n->nlmsg_len;
  73         struct rtattr * tb[RTA_MAX+1];
  74         char abuf[256];
  75         inet_prefix dst;
  76         inet_prefix src;
  77         int host_len = -1;
  78         SPRINT_BUF(b1);
  79
  80
  81         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
  82                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
  83                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
  84                 return 0;
  85         }
  86         if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
  87                 return 0;
  88         len -= NLMSG_LENGTH(sizeof(*r));
  89         if (len < 0) {
  90                 bb_error_msg("wrong nlmsg len %d", len);
  91                 return -1;
  92         }
  93
  94         if (r->rtm_family == AF_INET6)
  95                 host_len = 128;
  96         else if (r->rtm_family == AF_INET)
  97                 host_len = 32;
  98
  99         if (r->rtm_family == AF_INET6) {
 100                 if (filter.tb) {
 101                         if (filter.tb < 0) {
 102                                 if (!(r->rtm_flags&RTM_F_CLONED)) {
 103                                         return 0;
 104                                 }
 105                         } else {
 106                                 if (r->rtm_flags&RTM_F_CLONED) {
 107                                         return 0;
 108                                 }
 109                                 if (filter.tb == RT_TABLE_LOCAL) {
 110                                         if (r->rtm_type != RTN_LOCAL) {
 111                                                 return 0;
 112                                         }
 113                                 } else if (filter.tb == RT_TABLE_MAIN) {
 114                                         if (r->rtm_type == RTN_LOCAL) {
 115                                                 return 0;
 116                                         }
 117                                 } else {
 118                                         return 0;
 119                                 }
 120                         }
 121                 }
 122         } else {
 123                 if (filter.tb > 0 && filter.tb != r->rtm_table) {
 124                         return 0;
 125                 }
 126         }
 127         if (filter.rdst.family &&
 128             (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len)) {
 129                 return 0;
 130         }
 131         if (filter.mdst.family &&
 132             (r->rtm_family != filter.mdst.family ||
 133              (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len))) {
 134                 return 0;
 135         }
 136         if (filter.rsrc.family &&
 137             (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len)) {
 138                 return 0;
 139         }
 140         if (filter.msrc.family &&
 141             (r->rtm_family != filter.msrc.family ||
 142              (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len))) {
 143                 return 0;
 144         }
 145
 146         memset(tb, 0, sizeof(tb));
 147         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 148
 149         if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
 150                 return 0;
 151         if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
 152             inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
 153                 return 0;
 154
 155         if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
 156                 return 0;
 157         if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
 158             inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
 159                 return 0;
 160
 161         if (filter.flushb &&
 162             r->rtm_family == AF_INET6 &&
 163             r->rtm_dst_len == 0 &&
 164             r->rtm_type == RTN_UNREACHABLE &&
 165             tb[RTA_PRIORITY] &&
 166             *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
 167                 return 0;
 168
 169         if (filter.flushb) {
 170                 struct nlmsghdr *fn;
 171                 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
 172                         if (flush_update())
 173                                 return -1;
 174                 }
 175                 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
 176                 memcpy(fn, n, n->nlmsg_len);
 177                 fn->nlmsg_type = RTM_DELROUTE;
 178                 fn->nlmsg_flags = NLM_F_REQUEST;
 179                 fn->nlmsg_seq = ++filter.rth->seq;
 180                 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
 181                 filter.flushed++;
 182                 return 0;
 183         }
 184
 185         if (n->nlmsg_type == RTM_DELROUTE) {
 186                 fprintf(fp, "Deleted ");
 187         }
 188         if (r->rtm_type != RTN_UNICAST && !filter.type) {
 189                 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
 190         }
 191
 192         if (tb[RTA_DST]) {
 193                 if (r->rtm_dst_len != host_len) {
 194                         fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
 195                                                          RTA_PAYLOAD(tb[RTA_DST]),
 196                                                          RTA_DATA(tb[RTA_DST]),
 197                                                          abuf, sizeof(abuf)),
 198                                 r->rtm_dst_len
 199                                 );
 200                 } else {
 201                         fprintf(fp, "%s ", format_host(r->rtm_family,
 202                                                        RTA_PAYLOAD(tb[RTA_DST]),
 203                                                        RTA_DATA(tb[RTA_DST]),
 204                                                        abuf, sizeof(abuf))
 205                                 );
 206                 }
 207         } else if (r->rtm_dst_len) {
 208                 fprintf(fp, "0/%d ", r->rtm_dst_len);
 209         } else {
 210                 fprintf(fp, "default ");
 211         }
 212         if (tb[RTA_SRC]) {
 213                 if (r->rtm_src_len != host_len) {
 214                         fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
 215                                                          RTA_PAYLOAD(tb[RTA_SRC]),
 216                                                          RTA_DATA(tb[RTA_SRC]),
 217                                                          abuf, sizeof(abuf)),
 218                                 r->rtm_src_len
 219                                 );
 220                 } else {
 221                         fprintf(fp, "from %s ", format_host(r->rtm_family,
 222                                                        RTA_PAYLOAD(tb[RTA_SRC]),
 223                                                        RTA_DATA(tb[RTA_SRC]),
 224                                                        abuf, sizeof(abuf))
 225                                 );
 226                 }
 227         } else if (r->rtm_src_len) {
 228                 fprintf(fp, "from 0/%u ", r->rtm_src_len);
 229         }
 230         if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
 231                 fprintf(fp, "via %s ",
 232                         format_host(r->rtm_family,
 233                                     RTA_PAYLOAD(tb[RTA_GATEWAY]),
 234                                     RTA_DATA(tb[RTA_GATEWAY]),
 235                                     abuf, sizeof(abuf)));
 236         }
 237         if (tb[RTA_OIF] && filter.oifmask != -1) {
 238                 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 239         }
 240
 241         if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
 242                 /* Do not use format_host(). It is our local addr
 243                    and symbolic name will not be useful.
 244                  */
 245                 fprintf(fp, " src %s ",
 246                         rt_addr_n2a(r->rtm_family,
 247                                     RTA_PAYLOAD(tb[RTA_PREFSRC]),
 248                                     RTA_DATA(tb[RTA_PREFSRC]),
 249                                     abuf, sizeof(abuf)));
 250         }
 251         if (tb[RTA_PRIORITY]) {
 252                 fprintf(fp, " metric %d ", *(__u32*)RTA_DATA(tb[RTA_PRIORITY]));
 253         }
 254         if (r->rtm_family == AF_INET6) {
 255                 struct rta_cacheinfo *ci = NULL;
 256                 if (tb[RTA_CACHEINFO]) {
 257                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 258                 }
 259                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 260                         static int hz;
 261                         if (!hz) {
 262                                 hz = get_hz();
 263                         }
 264                         if (r->rtm_flags & RTM_F_CLONED) {
 265                                 fprintf(fp, "%s    cache ", _SL_);
 266                         }
 267                         if (ci->rta_expires) {
 268                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 269                         }
 270                         if (ci->rta_error != 0) {
 271                                 fprintf(fp, " error %d", ci->rta_error);
 272                         }
 273                 } else if (ci) {
 274                         if (ci->rta_error != 0)
 275                                 fprintf(fp, " error %d", ci->rta_error);
 276                 }
 277         }
 278         if (tb[RTA_IIF] && filter.iifmask != -1) {
 279                 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 280         }
 281         fprintf(fp, "\n");
 282         fflush(fp);
 283         return 0;
 284 }
 285
 286 static int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
 287 {
 288         struct rtnl_handle rth;
 289         struct {
 290                 struct nlmsghdr         n;
 291                 struct rtmsg            r;
 292                 char                    buf[1024];
 293         } req;
 294         char  mxbuf[256];
 295         struct rtattr * mxrta = (void*)mxbuf;
 296         unsigned mxlock = 0;
 297         char  *d = NULL;
 298         int gw_ok = 0;
 299         int dst_ok = 0;
 300         int proto_ok = 0;
 301         int type_ok = 0;
 302
 303         memset(&req, 0, sizeof(req));
 304
 305         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 306         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 307         req.n.nlmsg_type = cmd;
 308         req.r.rtm_family = preferred_family;
 309         req.r.rtm_table = RT_TABLE_MAIN;
 310         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 311
 312         if (cmd != RTM_DELROUTE) {
 313                 req.r.rtm_protocol = RTPROT_BOOT;
 314                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 315                 req.r.rtm_type = RTN_UNICAST;
 316         }
 317
 318         mxrta->rta_type = RTA_METRICS;
 319         mxrta->rta_len = RTA_LENGTH(0);
 320
 321         while (argc > 0) {
 322                 if (strcmp(*argv, "src") == 0) {
 323                         inet_prefix addr;
 324                         NEXT_ARG();
 325                         get_addr(&addr, *argv, req.r.rtm_family);
 326                         if (req.r.rtm_family == AF_UNSPEC) {
 327                                 req.r.rtm_family = addr.family;
 328                         }
 329                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 330                 } else if (strcmp(*argv, "via") == 0) {
 331                         inet_prefix addr;
 332                         gw_ok = 1;
 333                         NEXT_ARG();
 334                         get_addr(&addr, *argv, req.r.rtm_family);
 335                         if (req.r.rtm_family == AF_UNSPEC) {
 336                                 req.r.rtm_family = addr.family;
 337                         }
 338                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 339                 } else if (strcmp(*argv, "mtu") == 0) {
 340                         unsigned mtu;
 341                         NEXT_ARG();
 342                         if (strcmp(*argv, "lock") == 0) {
 343                                 mxlock |= (1<<RTAX_MTU);
 344                                 NEXT_ARG();
 345                         }
 346                         if (get_unsigned(&mtu, *argv, 0)) {
 347                                 invarg("\"mtu\" value is invalid\n", *argv);
 348                         }
 349                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 350                 } else if (matches(*argv, "protocol") == 0) {
 351                         int prot;
 352                         NEXT_ARG();
 353                         if (rtnl_rtprot_a2n(&prot, *argv))
 354                                 invarg("\"protocol\" value is invalid\n", *argv);
 355                         req.r.rtm_protocol = prot;
 356                         proto_ok =1;
 357                 } else if (strcmp(*argv, "dev") == 0 ||
 358                            strcmp(*argv, "oif") == 0) {
 359                         NEXT_ARG();
 360                         d = *argv;
 361                 } else {
 362                         int type;
 363                         inet_prefix dst;
 364
 365                         if (strcmp(*argv, "to") == 0) {
 366                                 NEXT_ARG();
 367                         }
 368                         if ((**argv < '0' || **argv > '9') &&
 369                             rtnl_rtntype_a2n(&type, *argv) == 0) {
 370                                 NEXT_ARG();
 371                                 req.r.rtm_type = type;
 372                                 type_ok = 1;
 373                         }
 374
 375                         if (dst_ok) {
 376                                 duparg2("to", *argv);
 377                         }
 378                         get_prefix(&dst, *argv, req.r.rtm_family);
 379                         if (req.r.rtm_family == AF_UNSPEC) {
 380                                 req.r.rtm_family = dst.family;
 381                         }
 382                         req.r.rtm_dst_len = dst.bitlen;
 383                         dst_ok = 1;
 384                         if (dst.bytelen) {
 385                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 386                         }
 387                 }
 388                 argc--; argv++;
 389         }
 390
 391         if (rtnl_open(&rth, 0) < 0) {
 392                 exit(1);
 393         }
 394
 395         if (d)  {
 396                 int idx;
 397
 398                 ll_init_map(&rth);
 399
 400                 if (d) {
 401                         if ((idx = ll_name_to_index(d)) == 0) {
 402                                 bb_error_msg("Cannot find device \"%s\"", d);
 403                                 return -1;
 404                         }
 405                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 406                 }
 407         }
 408
 409         if (mxrta->rta_len > RTA_LENGTH(0)) {
 410                 if (mxlock) {
 411                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 412                 }
 413                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 414         }
 415
 416         if (req.r.rtm_family == AF_UNSPEC) {
 417                 req.r.rtm_family = AF_INET;
 418         }
 419
 420         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 421                 exit(2);
 422         }
 423
 424         return 0;
 425 }
 426
 427 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 428 {
 429         struct {
 430                 struct nlmsghdr nlh;
 431                 struct rtmsg rtm;
 432         } req;
 433         struct sockaddr_nl nladdr;
 434
 435         memset(&nladdr, 0, sizeof(nladdr));
 436         memset(&req, 0, sizeof(req));
 437         nladdr.nl_family = AF_NETLINK;
 438
 439         req.nlh.nlmsg_len = sizeof(req);
 440         req.nlh.nlmsg_type = RTM_GETROUTE;
 441         req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
 442         req.nlh.nlmsg_pid = 0;
 443         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
 444         req.rtm.rtm_family = family;
 445         req.rtm.rtm_flags |= RTM_F_CLONED;
 446
 447         return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
 448 }
 449
 450 static int iproute_flush_cache(void)
 451 {
 452 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
 453
 454         int len;
 455         int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
 456         char *buffer = "-1";
 457
 458         if (flush_fd < 0) {
 459                 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
 460                 return -1;
 461         }
 462
 463         len = strlen (buffer);
 464
 465         if ((write (flush_fd, (void *)buffer, len)) < len) {
 466                 fprintf (stderr, "Cannot flush routing cache\n");
 467                 return -1;
 468         }
 469         close(flush_fd);
 470         return 0;
 471 }
 472
 473 static void iproute_reset_filter(void)
 474 {
 475         memset(&filter, 0, sizeof(filter));
 476         filter.mdst.bitlen = -1;
 477         filter.msrc.bitlen = -1;
 478 }
 479
 480 static int iproute_list_or_flush(int argc, char **argv, int flush)
 481 {
 482         int do_ipv6 = preferred_family;
 483         struct rtnl_handle rth;
 484         char *id = NULL;
 485         char *od = NULL;
 486
 487         iproute_reset_filter();
 488         filter.tb = RT_TABLE_MAIN;
 489
 490         if (flush && argc <= 0) {
 491                 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
 492                 return -1;
 493         }
 494
 495         while (argc > 0) {
 496                 if (matches(*argv, "protocol") == 0) {
 497                         int prot = 0;
 498                         NEXT_ARG();
 499                         filter.protocolmask = -1;
 500                         if (rtnl_rtprot_a2n(&prot, *argv)) {
 501                                 if (strcmp(*argv, "all") != 0) {
 502                                         invarg("invalid \"protocol\"\n", *argv);
 503                                 }
 504                                 prot = 0;
 505                                 filter.protocolmask = 0;
 506                         }
 507                         filter.protocol = prot;
 508                 } else if (strcmp(*argv, "dev") == 0 ||
 509                            strcmp(*argv, "oif") == 0) {
 510                         NEXT_ARG();
 511                         od = *argv;
 512                 } else if (strcmp(*argv, "iif") == 0) {
 513                         NEXT_ARG();
 514                         id = *argv;
 515                 } else if (matches(*argv, "from") == 0) {
 516                         NEXT_ARG();
 517                         if (matches(*argv, "root") == 0) {
 518                                 NEXT_ARG();
 519                                 get_prefix(&filter.rsrc, *argv, do_ipv6);
 520                         } else if (matches(*argv, "match") == 0) {
 521                                 NEXT_ARG();
 522                                 get_prefix(&filter.msrc, *argv, do_ipv6);
 523                         } else {
 524                                 if (matches(*argv, "exact") == 0) {
 525                                         NEXT_ARG();
 526                                 }
 527                                 get_prefix(&filter.msrc, *argv, do_ipv6);
 528                                 filter.rsrc = filter.msrc;
 529                         }
 530                 } else {
 531                         if (matches(*argv, "to") == 0) {
 532                                 NEXT_ARG();
 533                         }
 534                         if (matches(*argv, "root") == 0) {
 535                                 NEXT_ARG();
 536                                 get_prefix(&filter.rdst, *argv, do_ipv6);
 537                         } else if (matches(*argv, "match") == 0) {
 538                                 NEXT_ARG();
 539                                 get_prefix(&filter.mdst, *argv, do_ipv6);
 540                         } else {
 541                                 if (matches(*argv, "exact") == 0) {
 542                                         NEXT_ARG();
 543                                 }
 544                                 get_prefix(&filter.mdst, *argv, do_ipv6);
 545                                 filter.rdst = filter.mdst;
 546                         }
 547                 }
 548                 argc--; argv++;
 549         }
 550
 551         if (do_ipv6 == AF_UNSPEC && filter.tb) {
 552                 do_ipv6 = AF_INET;
 553         }
 554
 555         if (rtnl_open(&rth, 0) < 0) {
 556                 exit(1);
 557         }
 558
 559         ll_init_map(&rth);
 560
 561         if (id || od)  {
 562                 int idx;
 563
 564                 if (id) {
 565                         if ((idx = ll_name_to_index(id)) == 0) {
 566                                 bb_error_msg("Cannot find device \"%s\"", id);
 567                                 return -1;
 568                         }
 569                         filter.iif = idx;
 570                         filter.iifmask = -1;
 571                 }
 572                 if (od) {
 573                         if ((idx = ll_name_to_index(od)) == 0) {
 574                                 bb_error_msg("Cannot find device \"%s\"", od);
 575                         }
 576                         filter.oif = idx;
 577                         filter.oifmask = -1;
 578                 }
 579         }
 580
 581         if (flush) {
 582                 int round = 0;
 583                 char flushb[4096-512];
 584
 585                 if (filter.tb == -1) {
 586                         if (do_ipv6 != AF_INET6)
 587                                 iproute_flush_cache();
 588                         if (do_ipv6 == AF_INET)
 589                                 return 0;
 590                 }
 591
 592                 filter.flushb = flushb;
 593                 filter.flushp = 0;
 594                 filter.flushe = sizeof(flushb);
 595                 filter.rth = &rth;
 596
 597                 for (;;) {
 598                         if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
 599                                 perror("Cannot send dump request");
 600                                 return -1;
 601                         }
 602                         filter.flushed = 0;
 603                         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
 604                                 bb_error_msg("Flush terminated\n");
 605                                 return -1;
 606                         }
 607                         if (filter.flushed == 0) {
 608                                 if (round == 0) {
 609                                         if (filter.tb != -1 || do_ipv6 == AF_INET6)
 610                                                 fprintf(stderr, "Nothing to flush.\n");
 611                                 }
 612                                 fflush(stdout);
 613                                 return 0;
 614                         }
 615                         round++;
 616                         if (flush_update() < 0)
 617                                 exit(1);
 618                 }
 619         }
 620
 621         if (filter.tb != -1) {
 622                 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
 623                         bb_perror_msg_and_die("Cannot send dump request");
 624                 }
 625         } else {
 626                 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
 627                         bb_perror_msg_and_die("Cannot send dump request");
 628                 }
 629         }
 630
 631         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
 632                 bb_error_msg_and_die("Dump terminated");
 633         }
 634
 635         exit(0);
 636 }
 637
 638
 639 static int iproute_get(int argc, char **argv)
 640 {
 641         struct rtnl_handle rth;
 642         struct {
 643                 struct nlmsghdr         n;
 644                 struct rtmsg            r;
 645                 char                    buf[1024];
 646         } req;
 647         char  *idev = NULL;
 648         char  *odev = NULL;
 649         int connected = 0;
 650         int from_ok = 0;
 651         const char *options[] = { "from", "iif", "oif", "dev", "notify", "connected", "to", 0 };
 652
 653         memset(&req, 0, sizeof(req));
 654
 655         iproute_reset_filter();
 656
 657         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 658         req.n.nlmsg_flags = NLM_F_REQUEST;
 659         req.n.nlmsg_type = RTM_GETROUTE;
 660         req.r.rtm_family = preferred_family;
 661         req.r.rtm_table = 0;
 662         req.r.rtm_protocol = 0;
 663         req.r.rtm_scope = 0;
 664         req.r.rtm_type = 0;
 665         req.r.rtm_src_len = 0;
 666         req.r.rtm_dst_len = 0;
 667         req.r.rtm_tos = 0;
 668
 669         while (argc > 0) {
 670                 switch (compare_string_array(options, *argv)) {
 671                         case 0: /* from */
 672                         {
 673                                 inet_prefix addr;
 674                                 NEXT_ARG();
 675                                 from_ok = 1;
 676                                 get_prefix(&addr, *argv, req.r.rtm_family);
 677                                 if (req.r.rtm_family == AF_UNSPEC) {
 678                                         req.r.rtm_family = addr.family;
 679                                 }
 680                                 if (addr.bytelen) {
 681                                         addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 682                                 }
 683                                 req.r.rtm_src_len = addr.bitlen;
 684                                 break;
 685                         }
 686                         case 1: /* iif */
 687                                 NEXT_ARG();
 688                                 idev = *argv;
 689                                 break;
 690                         case 2: /* oif */
 691                         case 3: /* dev */
 692                                 NEXT_ARG();
 693                                 odev = *argv;
 694                                 break;
 695                         case 4: /* notify */
 696                                 req.r.rtm_flags |= RTM_F_NOTIFY;
 697                                 break;
 698                         case 5: /* connected */
 699                                 connected = 1;
 700                                 break;
 701                         case 6: /* to */
 702                                 NEXT_ARG();
 703                         default:
 704                         {
 705                                 inet_prefix addr;
 706                                 get_prefix(&addr, *argv, req.r.rtm_family);
 707                                 if (req.r.rtm_family == AF_UNSPEC) {
 708                                         req.r.rtm_family = addr.family;
 709                                 }
 710                                 if (addr.bytelen) {
 711                                         addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
 712                                 }
 713                                 req.r.rtm_dst_len = addr.bitlen;
 714                         }
 715                         argc--; argv++;
 716                 }
 717         }
 718
 719         if (req.r.rtm_dst_len == 0) {
 720                 bb_error_msg_and_die("need at least destination address");
 721         }
 722
 723         if (rtnl_open(&rth, 0) < 0)
 724                 exit(1);
 725
 726         ll_init_map(&rth);
 727
 728         if (idev || odev)  {
 729                 int idx;
 730
 731                 if (idev) {
 732                         if ((idx = ll_name_to_index(idev)) == 0) {
 733                                 bb_error_msg("Cannot find device \"%s\"", idev);
 734                                 return -1;
 735                         }
 736                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
 737                 }
 738                 if (odev) {
 739                         if ((idx = ll_name_to_index(odev)) == 0) {
 740                                 bb_error_msg("Cannot find device \"%s\"", odev);
 741                                 return -1;
 742                         }
 743                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 744                 }
 745         }
 746
 747         if (req.r.rtm_family == AF_UNSPEC) {
 748                 req.r.rtm_family = AF_INET;
 749         }
 750
 751         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 752                 exit(2);
 753         }
 754
 755         if (connected && !from_ok) {
 756                 struct rtmsg *r = NLMSG_DATA(&req.n);
 757                 int len = req.n.nlmsg_len;
 758                 struct rtattr * tb[RTA_MAX+1];
 759
 760                 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
 761                         bb_error_msg_and_die("An error :-)");
 762                 }
 763
 764                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
 765                         bb_error_msg("Not a route?");
 766                         return -1;
 767                 }
 768                 len -= NLMSG_LENGTH(sizeof(*r));
 769                 if (len < 0) {
 770                         bb_error_msg("Wrong len %d", len);
 771                         return -1;
 772                 }
 773
 774                 memset(tb, 0, sizeof(tb));
 775                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 776
 777                 if (tb[RTA_PREFSRC]) {
 778                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
 779                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
 780                 } else if (!tb[RTA_SRC]) {
 781                         bb_error_msg("Failed to connect the route");
 782                         return -1;
 783                 }
 784                 if (!odev && tb[RTA_OIF]) {
 785                         tb[RTA_OIF]->rta_type = 0;
 786                 }
 787                 if (tb[RTA_GATEWAY]) {
 788                         tb[RTA_GATEWAY]->rta_type = 0;
 789                 }
 790                 if (!idev && tb[RTA_IIF]) {
 791                         tb[RTA_IIF]->rta_type = 0;
 792                 }
 793                 req.n.nlmsg_flags = NLM_F_REQUEST;
 794                 req.n.nlmsg_type = RTM_GETROUTE;
 795
 796                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 797                         exit(2);
 798                 }
 799         }
 800
 801         if (print_route(NULL, &req.n, (void*)stdout) < 0) {
 802                 bb_error_msg_and_die("An error :-)");
 803         }
 804
 805         exit(0);
 806 }
 807
 808 int do_iproute(int argc, char **argv)
 809 {
 810         const char *ip_route_commands[] = { "add", "append", "change", "chg",
 811                 "delete", "del", "get", "list", "show", "prepend", "replace", "test", "flush", 0 };
 812         unsigned short command_num = 7;
 813         unsigned int flags = 0;
 814         int cmd = RTM_NEWROUTE;
 815
 816         if (*argv) {
 817                 command_num = compare_string_array(ip_route_commands, *argv);
 818         }
 819         switch(command_num) {
 820                 case 0: /* add*/
 821                         flags = NLM_F_CREATE|NLM_F_EXCL;
 822                         break;
 823                 case 1: /* append */
 824                         flags = NLM_F_CREATE|NLM_F_APPEND;
 825                         break;
 826                 case 2: /* change */
 827                 case 3: /* chg */
 828                         flags = NLM_F_REPLACE;
 829                         break;
 830                 case 4: /* delete */
 831                 case 5: /* del */
 832                         cmd = RTM_DELROUTE;
 833                         break;
 834                 case 6: /* get */
 835                         return iproute_get(argc-1, argv+1);
 836                 case 7: /* list */
 837                 case 8: /* show */
 838                         return iproute_list_or_flush(argc-1, argv+1, 0);
 839                 case 9: /* prepend */
 840                         flags = NLM_F_CREATE;
 841                 case 10: /* replace */
 842                         flags = NLM_F_CREATE|NLM_F_REPLACE;
 843                 case 11: /* test */
 844                         flags = NLM_F_EXCL;
 845                 case 12: /* flush */
 846                         return iproute_list_or_flush(argc-1, argv+1, 1);
 847                 default:
 848                         bb_error_msg_and_die("Unknown command %s", *argv);
 849         }
 850
 851         return iproute_modify(cmd, flags, argc-1, argv+1);
 852 }