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         memset(&src, 0, sizeof(src));
 163         memset(&dst, 0, sizeof(dst));
 164         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 165
 166         if (tb[RTA_SRC]) {
 167                 src.bitlen = r->rtm_src_len;
 168                 src.bytelen = (r->rtm_family == AF_INET6 ? 16 : 4);
 169                 memcpy(src.data, RTA_DATA(tb[RTA_SRC]), src.bytelen);
 170         }
 171         if (tb[RTA_DST]) {
 172                 dst.bitlen = r->rtm_dst_len;
 173                 dst.bytelen = (r->rtm_family == AF_INET6 ? 16 : 4);
 174                 memcpy(dst.data, RTA_DATA(tb[RTA_DST]), dst.bytelen);
 175         }
 176
 177         if (G_filter.rdst.family
 178          && inet_addr_match(&dst, &G_filter.rdst, G_filter.rdst.bitlen)
 179         ) {
 180                 return 0;
 181         }
 182         if (G_filter.mdst.family
 183          && G_filter.mdst.bitlen >= 0
 184          && inet_addr_match(&dst, &G_filter.mdst, r->rtm_dst_len)
 185         ) {
 186                 return 0;
 187         }
 188         if (G_filter.rsrc.family
 189          && inet_addr_match(&src, &G_filter.rsrc, G_filter.rsrc.bitlen)
 190         ) {
 191                 return 0;
 192         }
 193         if (G_filter.msrc.family && G_filter.msrc.bitlen >= 0
 194          && inet_addr_match(&src, &G_filter.msrc, r->rtm_src_len)
 195         ) {
 196                 return 0;
 197         }
 198         if (G_filter.oif != 0) {
 199                 if (!tb[RTA_OIF])
 200                         return 0;
 201                 if (G_filter.oif != *(int*)RTA_DATA(tb[RTA_OIF]))
 202                         return 0;
 203         }
 204
 205         if (G_filter.flushb) {
 206                 struct nlmsghdr *fn;
 207
 208                 /* We are creating route flush commands */
 209
 210                 if (r->rtm_family == AF_INET6
 211                  && r->rtm_dst_len == 0
 212                  && r->rtm_type == RTN_UNREACHABLE
 213                  && tb[RTA_PRIORITY]
 214                  && *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1
 215                 ) {
 216                         return 0;
 217                 }
 218
 219                 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
 220                         if (flush_update())
 221                                 bb_error_msg_and_die("flush");
 222                 }
 223                 fn = (void*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
 224                 memcpy(fn, n, n->nlmsg_len);
 225                 fn->nlmsg_type = RTM_DELROUTE;
 226                 fn->nlmsg_flags = NLM_F_REQUEST;
 227                 fn->nlmsg_seq = ++G_filter.rth->seq;
 228                 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
 229                 G_filter.flushed = 1;
 230                 return 0;
 231         }
 232
 233         /* We are printing routes */
 234
 235         if (n->nlmsg_type == RTM_DELROUTE) {
 236                 printf("Deleted ");
 237         }
 238         if (r->rtm_type != RTN_UNICAST /* && !G_filter.type - always 0 */) {
 239                 printf("%s ", rtnl_rtntype_n2a(r->rtm_type, b1));
 240         }
 241
 242         if (tb[RTA_DST]) {
 243                 if (r->rtm_dst_len != host_len) {
 244                         printf("%s/%u ", rt_addr_n2a(r->rtm_family,
 245                                                 RTA_DATA(tb[RTA_DST]),
 246                                                 abuf, sizeof(abuf)),
 247                                         r->rtm_dst_len
 248                                         );
 249                 } else {
 250                         printf("%s ", format_host(r->rtm_family,
 251                                                 RTA_PAYLOAD(tb[RTA_DST]),
 252                                                 RTA_DATA(tb[RTA_DST]),
 253                                                 abuf, sizeof(abuf))
 254                                         );
 255                 }
 256         } else if (r->rtm_dst_len) {
 257                 printf("0/%d ", r->rtm_dst_len);
 258         } else {
 259                 printf("default ");
 260         }
 261         if (tb[RTA_SRC]) {
 262                 if (r->rtm_src_len != host_len) {
 263                         printf("from %s/%u ", rt_addr_n2a(r->rtm_family,
 264                                                 RTA_DATA(tb[RTA_SRC]),
 265                                                 abuf, sizeof(abuf)),
 266                                         r->rtm_src_len
 267                                         );
 268                 } else {
 269                         printf("from %s ", format_host(r->rtm_family,
 270                                                 RTA_PAYLOAD(tb[RTA_SRC]),
 271                                                 RTA_DATA(tb[RTA_SRC]),
 272                                                 abuf, sizeof(abuf))
 273                                         );
 274                 }
 275         } else if (r->rtm_src_len) {
 276                 printf("from 0/%u ", r->rtm_src_len);
 277         }
 278         if (tb[RTA_GATEWAY] && G_filter.rvia.bitlen != host_len) {
 279                 printf("via %s ", format_host(r->rtm_family,
 280                                         RTA_PAYLOAD(tb[RTA_GATEWAY]),
 281                                         RTA_DATA(tb[RTA_GATEWAY]),
 282                                         abuf, sizeof(abuf)));
 283         }
 284         if (tb[RTA_OIF]) {
 285                 printf("dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 286         }
 287
 288         /* Todo: parse & show "proto kernel", "scope link" here */
 289
 290         if (tb[RTA_PREFSRC] && /*G_filter.rprefsrc.bitlen - always 0*/ 0 != host_len) {
 291                 /* Do not use format_host(). It is our local addr
 292                    and symbolic name will not be useful.
 293                  */
 294                 printf(" src %s ", rt_addr_n2a(r->rtm_family,
 295                                         RTA_DATA(tb[RTA_PREFSRC]),
 296                                         abuf, sizeof(abuf)));
 297         }
 298         if (tb[RTA_PRIORITY]) {
 299                 printf(" metric %d ", *(uint32_t*)RTA_DATA(tb[RTA_PRIORITY]));
 300         }
 301         if (r->rtm_family == AF_INET6) {
 302                 struct rta_cacheinfo *ci = NULL;
 303                 if (tb[RTA_CACHEINFO]) {
 304                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 305                 }
 306                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 307                         if (r->rtm_flags & RTM_F_CLONED) {
 308                                 printf("%c    cache ", _SL_);
 309                         }
 310                         if (ci->rta_expires) {
 311                                 printf(" expires %dsec", ci->rta_expires / get_hz());
 312                         }
 313                         if (ci->rta_error != 0) {
 314                                 printf(" error %d", ci->rta_error);
 315                         }
 316                 } else if (ci) {
 317                         if (ci->rta_error != 0)
 318                                 printf(" error %d", ci->rta_error);
 319                 }
 320         }
 321         if (tb[RTA_IIF] && G_filter.iif == 0) {
 322                 printf(" iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 323         }
 324         bb_putchar('\n');
 325         return 0;
 326 }
 327
 328 /* Return value becomes exitcode. It's okay to not return at all */
 329 static int iproute_modify(int cmd, unsigned flags, char **argv)
 330 {
 331         static const char keywords[] ALIGN1 =
 332                 "src\0""via\0""mtu\0""lock\0""protocol\0"IF_FEATURE_IP_RULE("table\0")
 333                 "dev\0""oif\0""to\0""metric\0";
 334         enum {
 335                 ARG_src,
 336                 ARG_via,
 337                 ARG_mtu, PARM_lock,
 338                 ARG_protocol,
 339 IF_FEATURE_IP_RULE(ARG_table,)
 340                 ARG_dev,
 341                 ARG_oif,
 342                 ARG_to,
 343                 ARG_metric,
 344         };
 345         enum {
 346                 gw_ok = 1 << 0,
 347                 dst_ok = 1 << 1,
 348                 proto_ok = 1 << 2,
 349                 type_ok = 1 << 3
 350         };
 351         struct rtnl_handle rth;
 352         struct {
 353                 struct nlmsghdr n;
 354                 struct rtmsg    r;
 355                 char            buf[1024];
 356         } req;
 357         char mxbuf[256];
 358         struct rtattr * mxrta = (void*)mxbuf;
 359         unsigned mxlock = 0;
 360         char *d = NULL;
 361         smalluint ok = 0;
 362         int arg;
 363
 364         memset(&req, 0, sizeof(req));
 365
 366         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 367         req.n.nlmsg_flags = NLM_F_REQUEST | flags;
 368         req.n.nlmsg_type = cmd;
 369         req.r.rtm_family = preferred_family;
 370         if (RT_TABLE_MAIN) /* if it is zero, memset already did it */
 371                 req.r.rtm_table = RT_TABLE_MAIN;
 372         if (RT_SCOPE_NOWHERE)
 373                 req.r.rtm_scope = RT_SCOPE_NOWHERE;
 374
 375         if (cmd != RTM_DELROUTE) {
 376                 req.r.rtm_protocol = RTPROT_BOOT;
 377                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 378                 req.r.rtm_type = RTN_UNICAST;
 379         }
 380
 381         mxrta->rta_type = RTA_METRICS;
 382         mxrta->rta_len = RTA_LENGTH(0);
 383
 384         while (*argv) {
 385                 arg = index_in_substrings(keywords, *argv);
 386                 if (arg == ARG_src) {
 387                         inet_prefix addr;
 388                         NEXT_ARG();
 389                         get_addr(&addr, *argv, req.r.rtm_family);
 390                         if (req.r.rtm_family == AF_UNSPEC)
 391                                 req.r.rtm_family = addr.family;
 392                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 393                 } else if (arg == ARG_via) {
 394                         inet_prefix addr;
 395                         ok |= gw_ok;
 396                         NEXT_ARG();
 397                         get_addr(&addr, *argv, req.r.rtm_family);
 398                         if (req.r.rtm_family == AF_UNSPEC) {
 399                                 req.r.rtm_family = addr.family;
 400                         }
 401                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 402                 } else if (arg == ARG_mtu) {
 403                         unsigned mtu;
 404                         NEXT_ARG();
 405                         if (index_in_strings(keywords, *argv) == PARM_lock) {
 406                                 mxlock |= (1 << RTAX_MTU);
 407                                 NEXT_ARG();
 408                         }
 409                         mtu = get_unsigned(*argv, "mtu");
 410                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 411                 } else if (arg == ARG_protocol) {
 412                         uint32_t prot;
 413                         NEXT_ARG();
 414                         if (rtnl_rtprot_a2n(&prot, *argv))
 415                                 invarg(*argv, "protocol");
 416                         req.r.rtm_protocol = prot;
 417                         ok |= proto_ok;
 418 #if ENABLE_FEATURE_IP_RULE
 419                 } else if (arg == ARG_table) {
 420                         uint32_t tid;
 421                         NEXT_ARG();
 422                         if (rtnl_rttable_a2n(&tid, *argv))
 423                                 invarg(*argv, "table");
 424                         req.r.rtm_table = tid;
 425 #endif
 426                 } else if (arg == ARG_dev || arg == ARG_oif) {
 427                         NEXT_ARG();
 428                         d = *argv;
 429                 } else if (arg == ARG_metric) {
 430                         uint32_t metric;
 431                         NEXT_ARG();
 432                         metric = get_u32(*argv, "metric");
 433                         addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
 434                 } else {
 435                         int type;
 436                         inet_prefix dst;
 437
 438                         if (arg == ARG_to) {
 439                                 NEXT_ARG();
 440                         }
 441                         if ((**argv < '0' || **argv > '9')
 442                          && rtnl_rtntype_a2n(&type, *argv) == 0
 443                         ) {
 444                                 NEXT_ARG();
 445                                 req.r.rtm_type = type;
 446                                 ok |= type_ok;
 447                         }
 448
 449                         if (ok & dst_ok) {
 450                                 duparg2("to", *argv);
 451                         }
 452                         get_prefix(&dst, *argv, req.r.rtm_family);
 453                         if (req.r.rtm_family == AF_UNSPEC) {
 454                                 req.r.rtm_family = dst.family;
 455                         }
 456                         req.r.rtm_dst_len = dst.bitlen;
 457                         ok |= dst_ok;
 458                         if (dst.bytelen) {
 459                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 460                         }
 461                 }
 462                 argv++;
 463         }
 464
 465         xrtnl_open(&rth);
 466
 467         if (d)  {
 468                 int idx;
 469
 470                 ll_init_map(&rth);
 471
 472                 if (d) {
 473                         idx = xll_name_to_index(d);
 474                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 475                 }
 476         }
 477
 478         if (mxrta->rta_len > RTA_LENGTH(0)) {
 479                 if (mxlock) {
 480                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 481                 }
 482                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 483         }
 484
 485         if (req.r.rtm_type == RTN_LOCAL || req.r.rtm_type == RTN_NAT)
 486                 req.r.rtm_scope = RT_SCOPE_HOST;
 487         else
 488         if (req.r.rtm_type == RTN_BROADCAST
 489          || req.r.rtm_type == RTN_MULTICAST
 490          || req.r.rtm_type == RTN_ANYCAST
 491         ) {
 492                 req.r.rtm_scope = RT_SCOPE_LINK;
 493         }
 494         else if (req.r.rtm_type == RTN_UNICAST || req.r.rtm_type == RTN_UNSPEC) {
 495                 if (cmd == RTM_DELROUTE)
 496                         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 497                 else if (!(ok & gw_ok))
 498                         req.r.rtm_scope = RT_SCOPE_LINK;
 499         }
 500
 501         if (req.r.rtm_family == AF_UNSPEC) {
 502                 req.r.rtm_family = AF_INET;
 503         }
 504
 505         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) {
 506                 return 2;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 513 {
 514         struct {
 515                 struct nlmsghdr nlh;
 516                 struct rtmsg rtm;
 517         } req;
 518         struct sockaddr_nl nladdr;
 519
 520         memset(&nladdr, 0, sizeof(nladdr));
 521         memset(&req, 0, sizeof(req));
 522         nladdr.nl_family = AF_NETLINK;
 523
 524         req.nlh.nlmsg_len = sizeof(req);
 525         if (RTM_GETROUTE)
 526                 req.nlh.nlmsg_type = RTM_GETROUTE;
 527         if (NLM_F_ROOT | NLM_F_REQUEST)
 528                 req.nlh.nlmsg_flags = NLM_F_ROOT | NLM_F_REQUEST;
 529         /*req.nlh.nlmsg_pid = 0; - memset did it already */
 530         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
 531         req.rtm.rtm_family = family;
 532         if (RTM_F_CLONED)
 533                 req.rtm.rtm_flags = RTM_F_CLONED;
 534
 535         return xsendto(rth->fd, (void*)&req, sizeof(req), (struct sockaddr*)&nladdr, sizeof(nladdr));
 536 }
 537
 538 static void iproute_flush_cache(void)
 539 {
 540         static const char fn[] ALIGN1 = "/proc/sys/net/ipv4/route/flush";
 541         int flush_fd = open_or_warn(fn, O_WRONLY);
 542
 543         if (flush_fd < 0) {
 544                 return;
 545         }
 546
 547         if (write(flush_fd, "-1", 2) < 2) {
 548                 bb_perror_msg("can't flush routing cache");
 549                 return;
 550         }
 551         close(flush_fd);
 552 }
 553
 554 static void iproute_reset_filter(void)
 555 {
 556         memset(&G_filter, 0, sizeof(G_filter));
 557         G_filter.mdst.bitlen = -1;
 558         G_filter.msrc.bitlen = -1;
 559 }
 560
 561 /* Return value becomes exitcode. It's okay to not return at all */
 562 static int iproute_list_or_flush(char **argv, int flush)
 563 {
 564         int do_ipv6 = preferred_family;
 565         struct rtnl_handle rth;
 566         char *id = NULL;
 567         char *od = NULL;
 568         static const char keywords[] ALIGN1 =
 569                 /* "ip route list/flush" parameters: */
 570                 "protocol\0" "dev\0"   "oif\0"   "iif\0"
 571                 "via\0"      "table\0" "cache\0"
 572                 "from\0"     "to\0"
 573                 /* and possible further keywords */
 574                 "all\0"
 575                 "root\0"
 576                 "match\0"
 577                 "exact\0"
 578                 "main\0"
 579                 ;
 580         enum {
 581                 KW_proto, KW_dev,   KW_oif,  KW_iif,
 582                 KW_via,   KW_table, KW_cache,
 583                 KW_from,  KW_to,
 584                 /* */
 585                 KW_all,
 586                 KW_root,
 587                 KW_match,
 588                 KW_exact,
 589                 KW_main,
 590         };
 591         int arg, parm;
 592
 593         iproute_reset_filter();
 594         G_filter.tb = RT_TABLE_MAIN;
 595
 596         if (flush && !*argv)
 597                 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip route flush\"");
 598
 599         while (*argv) {
 600                 arg = index_in_substrings(keywords, *argv);
 601                 if (arg == KW_proto) {
 602                         uint32_t prot = 0;
 603                         NEXT_ARG();
 604                         //G_filter.protocolmask = -1;
 605                         if (rtnl_rtprot_a2n(&prot, *argv)) {
 606                                 if (index_in_strings(keywords, *argv) != KW_all)
 607                                         invarg(*argv, "protocol");
 608                                 prot = 0;
 609                                 //G_filter.protocolmask = 0;
 610                         }
 611                         //G_filter.protocol = prot;
 612                 } else if (arg == KW_dev || arg == KW_oif) {
 613                         NEXT_ARG();
 614                         od = *argv;
 615                 } else if (arg == KW_iif) {
 616                         NEXT_ARG();
 617                         id = *argv;
 618                 } else if (arg == KW_via) {
 619                         NEXT_ARG();
 620                         get_prefix(&G_filter.rvia, *argv, do_ipv6);
 621                 } else if (arg == KW_table) { /* table all/cache/main */
 622                         NEXT_ARG();
 623                         parm = index_in_substrings(keywords, *argv);
 624                         if (parm == KW_cache)
 625                                 G_filter.tb = -1;
 626                         else if (parm == KW_all)
 627                                 G_filter.tb = 0;
 628                         else if (parm != KW_main) {
 629 #if ENABLE_FEATURE_IP_RULE
 630                                 uint32_t tid;
 631                                 if (rtnl_rttable_a2n(&tid, *argv))
 632                                         invarg(*argv, "table");
 633                                 G_filter.tb = tid;
 634 #else
 635                                 invarg(*argv, "table");
 636 #endif
 637                         }
 638                 } else if (arg == KW_cache) {
 639                         /* The command 'ip route flush cache' is used by OpenSWAN.
 640                          * Assuming it's a synonym for 'ip route flush table cache' */
 641                         G_filter.tb = -1;
 642                 } else if (arg == KW_from) {
 643                         NEXT_ARG();
 644                         parm = index_in_substrings(keywords, *argv);
 645                         if (parm == KW_root) {
 646                                 NEXT_ARG();
 647                                 get_prefix(&G_filter.rsrc, *argv, do_ipv6);
 648                         } else if (parm == KW_match) {
 649                                 NEXT_ARG();
 650                                 get_prefix(&G_filter.msrc, *argv, do_ipv6);
 651                         } else {
 652                                 if (parm == KW_exact)
 653                                         NEXT_ARG();
 654                                 get_prefix(&G_filter.msrc, *argv, do_ipv6);
 655                                 G_filter.rsrc = G_filter.msrc;
 656                         }
 657                 } else { /* "to" is the default parameter */
 658                         if (arg == KW_to) {
 659                                 NEXT_ARG();
 660                                 arg = index_in_substrings(keywords, *argv);
 661                         }
 662                         /* parm = arg; - would be more plausible, but we reuse 'arg' here */
 663                         if (arg == KW_root) {
 664                                 NEXT_ARG();
 665                                 get_prefix(&G_filter.rdst, *argv, do_ipv6);
 666                         } else if (arg == KW_match) {
 667                                 NEXT_ARG();
 668                                 get_prefix(&G_filter.mdst, *argv, do_ipv6);
 669                         } else { /* "to exact" is the default */
 670                                 if (arg == KW_exact)
 671                                         NEXT_ARG();
 672                                 get_prefix(&G_filter.mdst, *argv, do_ipv6);
 673                                 G_filter.rdst = G_filter.mdst;
 674                         }
 675                 }
 676                 argv++;
 677         }
 678
 679         if (do_ipv6 == AF_UNSPEC && G_filter.tb) {
 680                 do_ipv6 = AF_INET;
 681         }
 682
 683         xrtnl_open(&rth);
 684         ll_init_map(&rth);
 685
 686         if (id || od)  {
 687                 int idx;
 688
 689                 if (id) {
 690                         idx = xll_name_to_index(id);
 691                         G_filter.iif = idx;
 692                 }
 693                 if (od) {
 694                         idx = xll_name_to_index(od);
 695                         G_filter.oif = idx;
 696                 }
 697         }
 698
 699         if (flush) {
 700                 char flushb[4096-512];
 701
 702                 if (G_filter.tb == -1) { /* "flush table cache" */
 703                         if (do_ipv6 != AF_INET6)
 704                                 iproute_flush_cache();
 705                         if (do_ipv6 == AF_INET)
 706                                 return 0;
 707                 }
 708
 709                 G_filter.flushb = flushb;
 710                 G_filter.flushp = 0;
 711                 G_filter.flushe = sizeof(flushb);
 712                 G_filter.rth = &rth;
 713
 714                 for (;;) {
 715                         xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
 716                         G_filter.flushed = 0;
 717                         xrtnl_dump_filter(&rth, print_route, NULL);
 718                         if (G_filter.flushed == 0)
 719                                 return 0;
 720                         if (flush_update())
 721                                 return 1;
 722                 }
 723         }
 724
 725         if (G_filter.tb != -1) {
 726                 xrtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE);
 727         } else if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
 728                 bb_perror_msg_and_die("can't send dump request");
 729         }
 730         xrtnl_dump_filter(&rth, print_route, NULL);
 731
 732         return 0;
 733 }
 734
 735
 736 /* Return value becomes exitcode. It's okay to not return at all */
 737 static int iproute_get(char **argv)
 738 {
 739         struct rtnl_handle rth;
 740         struct {
 741                 struct nlmsghdr n;
 742                 struct rtmsg    r;
 743                 char            buf[1024];
 744         } req;
 745         char *idev = NULL;
 746         char *odev = NULL;
 747         bool connected = 0;
 748         bool from_ok = 0;
 749         static const char options[] ALIGN1 =
 750                 "from\0""iif\0""oif\0""dev\0""notify\0""connected\0""to\0";
 751
 752         memset(&req, 0, sizeof(req));
 753
 754         iproute_reset_filter();
 755
 756         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 757         if (NLM_F_REQUEST)
 758                 req.n.nlmsg_flags = NLM_F_REQUEST;
 759         if (RTM_GETROUTE)
 760                 req.n.nlmsg_type = RTM_GETROUTE;
 761         req.r.rtm_family = preferred_family;
 762         /*req.r.rtm_table = 0; - memset did this already */
 763         /*req.r.rtm_protocol = 0;*/
 764         /*req.r.rtm_scope = 0;*/
 765         /*req.r.rtm_type = 0;*/
 766         /*req.r.rtm_src_len = 0;*/
 767         /*req.r.rtm_dst_len = 0;*/
 768         /*req.r.rtm_tos = 0;*/
 769
 770         while (*argv) {
 771                 switch (index_in_strings(options, *argv)) {
 772                         case 0: /* from */
 773                         {
 774                                 inet_prefix addr;
 775                                 NEXT_ARG();
 776                                 from_ok = 1;
 777                                 get_prefix(&addr, *argv, req.r.rtm_family);
 778                                 if (req.r.rtm_family == AF_UNSPEC) {
 779                                         req.r.rtm_family = addr.family;
 780                                 }
 781                                 if (addr.bytelen) {
 782                                         addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 783                                 }
 784                                 req.r.rtm_src_len = addr.bitlen;
 785                                 break;
 786                         }
 787                         case 1: /* iif */
 788                                 NEXT_ARG();
 789                                 idev = *argv;
 790                                 break;
 791                         case 2: /* oif */
 792                         case 3: /* dev */
 793                                 NEXT_ARG();
 794                                 odev = *argv;
 795                                 break;
 796                         case 4: /* notify */
 797                                 req.r.rtm_flags |= RTM_F_NOTIFY;
 798                                 break;
 799                         case 5: /* connected */
 800                                 connected = 1;
 801                                 break;
 802                         case 6: /* to */
 803                                 NEXT_ARG();
 804                         default:
 805                         {
 806                                 inet_prefix addr;
 807                                 get_prefix(&addr, *argv, req.r.rtm_family);
 808                                 if (req.r.rtm_family == AF_UNSPEC) {
 809                                         req.r.rtm_family = addr.family;
 810                                 }
 811                                 if (addr.bytelen) {
 812                                         addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
 813                                 }
 814                                 req.r.rtm_dst_len = addr.bitlen;
 815                         }
 816                 }
 817                 argv++;
 818         }
 819
 820         if (req.r.rtm_dst_len == 0) {
 821                 bb_error_msg_and_die("need at least destination address");
 822         }
 823
 824         xrtnl_open(&rth);
 825
 826         ll_init_map(&rth);
 827
 828         if (idev || odev)  {
 829                 int idx;
 830
 831                 if (idev) {
 832                         idx = xll_name_to_index(idev);
 833                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
 834                 }
 835                 if (odev) {
 836                         idx = xll_name_to_index(odev);
 837                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 838                 }
 839         }
 840
 841         if (req.r.rtm_family == AF_UNSPEC) {
 842                 req.r.rtm_family = AF_INET;
 843         }
 844
 845         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 846                 return 2;
 847         }
 848
 849         if (connected && !from_ok) {
 850                 struct rtmsg *r = NLMSG_DATA(&req.n);
 851                 int len = req.n.nlmsg_len;
 852                 struct rtattr * tb[RTA_MAX+1];
 853
 854                 print_route(NULL, &req.n, NULL);
 855
 856                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
 857                         bb_error_msg_and_die("not a route?");
 858                 }
 859                 len -= NLMSG_LENGTH(sizeof(*r));
 860                 if (len < 0) {
 861                         bb_error_msg_and_die("wrong len %d", len);
 862                 }
 863
 864                 memset(tb, 0, sizeof(tb));
 865                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 866
 867                 if (tb[RTA_PREFSRC]) {
 868                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
 869                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
 870                 } else if (!tb[RTA_SRC]) {
 871                         bb_error_msg_and_die("can't connect the route");
 872                 }
 873                 if (!odev && tb[RTA_OIF]) {
 874                         tb[RTA_OIF]->rta_type = 0;
 875                 }
 876                 if (tb[RTA_GATEWAY]) {
 877                         tb[RTA_GATEWAY]->rta_type = 0;
 878                 }
 879                 if (!idev && tb[RTA_IIF]) {
 880                         tb[RTA_IIF]->rta_type = 0;
 881                 }
 882                 req.n.nlmsg_flags = NLM_F_REQUEST;
 883                 req.n.nlmsg_type = RTM_GETROUTE;
 884
 885                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0) {
 886                         return 2;
 887                 }
 888         }
 889         print_route(NULL, &req.n, NULL);
 890         return 0;
 891 }
 892
 893 /* Return value becomes exitcode. It's okay to not return at all */
 894 int FAST_FUNC do_iproute(char **argv)
 895 {
 896         static const char ip_route_commands[] ALIGN1 =
 897         /*0-3*/ "add\0""append\0""change\0""chg\0"
 898         /*4-7*/ "delete\0""get\0""list\0""show\0"
 899         /*8..*/ "prepend\0""replace\0""test\0""flush\0";
 900         int command_num;
 901         unsigned flags = 0;
 902         int cmd = RTM_NEWROUTE;
 903
 904         if (!*argv)
 905                 return iproute_list_or_flush(argv, 0);
 906
 907         /* "Standard" 'ip r a' treats 'a' as 'add', not 'append' */
 908         /* It probably means that it is using "first match" rule */
 909         command_num = index_in_substrings(ip_route_commands, *argv);
 910
 911         switch (command_num) {
 912                 case 0: /* add */
 913                         flags = NLM_F_CREATE|NLM_F_EXCL;
 914                         break;
 915                 case 1: /* append */
 916                         flags = NLM_F_CREATE|NLM_F_APPEND;
 917                         break;
 918                 case 2: /* change */
 919                 case 3: /* chg */
 920                         flags = NLM_F_REPLACE;
 921                         break;
 922                 case 4: /* delete */
 923                         cmd = RTM_DELROUTE;
 924                         break;
 925                 case 5: /* get */
 926                         return iproute_get(argv+1);
 927                 case 6: /* list */
 928                 case 7: /* show */
 929                         return iproute_list_or_flush(argv+1, 0);
 930                 case 8: /* prepend */
 931                         flags = NLM_F_CREATE;
 932                         break;
 933                 case 9: /* replace */
 934                         flags = NLM_F_CREATE|NLM_F_REPLACE;
 935                         break;
 936                 case 10: /* test */
 937                         flags = NLM_F_EXCL;
 938                         break;
 939                 case 11: /* flush */
 940                         return iproute_list_or_flush(argv+1, 1);
 941                 default:
 942                         bb_error_msg_and_die("unknown command %s", *argv);
 943         }
 944
 945         return iproute_modify(cmd, flags, argv+1);
 946 }