ip/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
  13 #include <stdio.h>
  14 #include <stdlib.h>
  15 #include <unistd.h>
  16 #include <syslog.h>
  17 #include <fcntl.h>
  18 #include <string.h>
  19 #include <time.h>
  20 #include <sys/time.h>
  21 #include <sys/socket.h>
  22 #include <netinet/in.h>
  23 #include <netinet/ip.h>
  24 #include <arpa/inet.h>
  25 #include <linux/in_route.h>
  26
  27 #include "rt_names.h"
  28 #include "utils.h"
  29 #include "ip_common.h"
  30
  31 #ifndef RTAX_RTTVAR
  32 #define RTAX_RTTVAR RTAX_HOPS
  33 #endif
  34
  35
  36 static const char *mx_names[RTAX_MAX+1] = {
  37         [RTAX_MTU]      = "mtu",
  38         [RTAX_WINDOW]   = "window",
  39         [RTAX_RTT]      = "rtt",
  40         [RTAX_RTTVAR]   = "rttvar",
  41         [RTAX_SSTHRESH] = "ssthresh",
  42         [RTAX_CWND]     = "cwnd",
  43         [RTAX_ADVMSS]   = "advmss",
  44         [RTAX_REORDERING]="reordering",
  45         [RTAX_HOPLIMIT] = "hoplimit",
  46         [RTAX_INITCWND] = "initcwnd",
  47         [RTAX_FEATURES] = "features",
  48         [RTAX_RTO_MIN]  = "rto_min",
  49 };
  50 static void usage(void) __attribute__((noreturn));
  51
  52 static void usage(void)
  53 {
  54         fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
  55         fprintf(stderr, "       ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
  56         fprintf(stderr, "                            [ oif STRING ]  [ tos TOS ]\n");
  57         fprintf(stderr, "       ip route { add | del | change | append | replace | monitor } ROUTE\n");
  58         fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
  59         fprintf(stderr, "            [ table TABLE_ID ] [ proto RTPROTO ]\n");
  60         fprintf(stderr, "            [ type TYPE ] [ scope SCOPE ]\n");
  61         fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
  62         fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
  63         fprintf(stderr, "             [ table TABLE_ID ] [ proto RTPROTO ]\n");
  64         fprintf(stderr, "             [ scope SCOPE ] [ metric METRIC ]\n");
  65         fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
  66         fprintf(stderr, "NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
  67         fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]\n");
  68         fprintf(stderr, "           [ rtt TIME ] [ rttvar TIME ] [reordering NUMBER ]\n");
  69         fprintf(stderr, "           [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
  70         fprintf(stderr, "           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
  71         fprintf(stderr, "           [ rto_min TIME ] [ hoplimit NUMBER ] \n");
  72         fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
  73         fprintf(stderr, "          unreachable | prohibit | blackhole | nat ]\n");
  74         fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
  75         fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
  76         fprintf(stderr, "MP_ALGO := { rr | drr | random | wrandom }\n");
  77         fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
  78         fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
  79         fprintf(stderr, "TIME := NUMBER[s|ms|us|ns|j]\n");
  80         exit(-1);
  81 }
  82
  83
  84 static struct
  85 {
  86         int tb;
  87         int cloned;
  88         int flushed;
  89         char *flushb;
  90         int flushp;
  91         int flushe;
  92         int protocol, protocolmask;
  93         int scope, scopemask;
  94         int type, typemask;
  95         int tos, tosmask;
  96         int iif, iifmask;
  97         int oif, oifmask;
  98         int realm, realmmask;
  99         inet_prefix rprefsrc;
 100         inet_prefix rvia;
 101         inet_prefix rdst;
 102         inet_prefix mdst;
 103         inet_prefix rsrc;
 104         inet_prefix msrc;
 105 } filter;
 106
 107 static int flush_update(void)
 108 {
 109         if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
 110                 perror("Failed to send flush request");
 111                 return -1;
 112         }
 113         filter.flushp = 0;
 114         return 0;
 115 }
 116
 117 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 118 {
 119         FILE *fp = (FILE*)arg;
 120         struct rtmsg *r = NLMSG_DATA(n);
 121         int len = n->nlmsg_len;
 122         struct rtattr * tb[RTA_MAX+1];
 123         char abuf[256];
 124         inet_prefix dst;
 125         inet_prefix src;
 126         inet_prefix prefsrc;
 127         inet_prefix via;
 128         int host_len = -1;
 129         static int ip6_multiple_tables;
 130         __u32 table;
 131         SPRINT_BUF(b1);
 132         static int hz;
 133
 134         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
 135                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
 136                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 137                 return 0;
 138         }
 139         if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
 140                 return 0;
 141         len -= NLMSG_LENGTH(sizeof(*r));
 142         if (len < 0) {
 143                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 144                 return -1;
 145         }
 146
 147         if (r->rtm_family == AF_INET6)
 148                 host_len = 128;
 149         else if (r->rtm_family == AF_INET)
 150                 host_len = 32;
 151         else if (r->rtm_family == AF_DECnet)
 152                 host_len = 16;
 153         else if (r->rtm_family == AF_IPX)
 154                 host_len = 80;
 155
 156         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 157         table = rtm_get_table(r, tb);
 158
 159         if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
 160                 ip6_multiple_tables = 1;
 161
 162         if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
 163                 if (filter.cloned) {
 164                         if (!(r->rtm_flags&RTM_F_CLONED))
 165                                 return 0;
 166                 }
 167                 if (filter.tb) {
 168                         if (!filter.cloned && r->rtm_flags&RTM_F_CLONED)
 169                                 return 0;
 170                         if (filter.tb == RT_TABLE_LOCAL) {
 171                                 if (r->rtm_type != RTN_LOCAL)
 172                                         return 0;
 173                         } else if (filter.tb == RT_TABLE_MAIN) {
 174                                 if (r->rtm_type == RTN_LOCAL)
 175                                         return 0;
 176                         } else {
 177                                 return 0;
 178                         }
 179                 }
 180         } else {
 181                 if (filter.cloned) {
 182                         if (!(r->rtm_flags&RTM_F_CLONED))
 183                                 return 0;
 184                 }
 185                 if (filter.tb > 0 && filter.tb != table)
 186                         return 0;
 187         }
 188         if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
 189                 return 0;
 190         if ((filter.scope^r->rtm_scope)&filter.scopemask)
 191                 return 0;
 192         if ((filter.type^r->rtm_type)&filter.typemask)
 193                 return 0;
 194         if ((filter.tos^r->rtm_tos)&filter.tosmask)
 195                 return 0;
 196         if (filter.rdst.family &&
 197             (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
 198                 return 0;
 199         if (filter.mdst.family &&
 200             (r->rtm_family != filter.mdst.family ||
 201              (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
 202                 return 0;
 203         if (filter.rsrc.family &&
 204             (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
 205                 return 0;
 206         if (filter.msrc.family &&
 207             (r->rtm_family != filter.msrc.family ||
 208              (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
 209                 return 0;
 210         if (filter.rvia.family && r->rtm_family != filter.rvia.family)
 211                 return 0;
 212         if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
 213                 return 0;
 214
 215         memset(&dst, 0, sizeof(dst));
 216         dst.family = r->rtm_family;
 217         if (tb[RTA_DST])
 218                 memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
 219         if (filter.rsrc.family || filter.msrc.family) {
 220                 memset(&src, 0, sizeof(src));
 221                 src.family = r->rtm_family;
 222                 if (tb[RTA_SRC])
 223                         memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
 224         }
 225         if (filter.rvia.bitlen>0) {
 226                 memset(&via, 0, sizeof(via));
 227                 via.family = r->rtm_family;
 228                 if (tb[RTA_GATEWAY])
 229                         memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
 230         }
 231         if (filter.rprefsrc.bitlen>0) {
 232                 memset(&prefsrc, 0, sizeof(prefsrc));
 233                 prefsrc.family = r->rtm_family;
 234                 if (tb[RTA_PREFSRC])
 235                         memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
 236         }
 237
 238         if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
 239                 return 0;
 240         if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
 241             inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
 242                 return 0;
 243
 244         if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
 245                 return 0;
 246         if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
 247             inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
 248                 return 0;
 249
 250         if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
 251                 return 0;
 252         if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
 253                 return 0;
 254         if (filter.realmmask) {
 255                 __u32 realms = 0;
 256                 if (tb[RTA_FLOW])
 257                         realms = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
 258                 if ((realms^filter.realm)&filter.realmmask)
 259                         return 0;
 260         }
 261         if (filter.iifmask) {
 262                 int iif = 0;
 263                 if (tb[RTA_IIF])
 264                         iif = *(int*)RTA_DATA(tb[RTA_IIF]);
 265                 if ((iif^filter.iif)&filter.iifmask)
 266                         return 0;
 267         }
 268         if (filter.oifmask) {
 269                 int oif = 0;
 270                 if (tb[RTA_OIF])
 271                         oif = *(int*)RTA_DATA(tb[RTA_OIF]);
 272                 if ((oif^filter.oif)&filter.oifmask)
 273                         return 0;
 274         }
 275         if (filter.flushb &&
 276             r->rtm_family == AF_INET6 &&
 277             r->rtm_dst_len == 0 &&
 278             r->rtm_type == RTN_UNREACHABLE &&
 279             tb[RTA_PRIORITY] &&
 280             *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
 281                 return 0;
 282
 283         if (filter.flushb) {
 284                 struct nlmsghdr *fn;
 285                 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
 286                         if (flush_update())
 287                                 return -1;
 288                 }
 289                 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
 290                 memcpy(fn, n, n->nlmsg_len);
 291                 fn->nlmsg_type = RTM_DELROUTE;
 292                 fn->nlmsg_flags = NLM_F_REQUEST;
 293                 fn->nlmsg_seq = ++rth.seq;
 294                 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
 295                 filter.flushed++;
 296                 if (show_stats < 2)
 297                         return 0;
 298         }
 299
 300         if (n->nlmsg_type == RTM_DELROUTE)
 301                 fprintf(fp, "Deleted ");
 302         if (r->rtm_type != RTN_UNICAST && !filter.type)
 303                 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
 304
 305         if (tb[RTA_DST]) {
 306                 if (r->rtm_dst_len != host_len) {
 307                         fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
 308                                                          RTA_PAYLOAD(tb[RTA_DST]),
 309                                                          RTA_DATA(tb[RTA_DST]),
 310                                                          abuf, sizeof(abuf)),
 311                                 r->rtm_dst_len
 312                                 );
 313                 } else {
 314                         fprintf(fp, "%s ", format_host(r->rtm_family,
 315                                                        RTA_PAYLOAD(tb[RTA_DST]),
 316                                                        RTA_DATA(tb[RTA_DST]),
 317                                                        abuf, sizeof(abuf))
 318                                 );
 319                 }
 320         } else if (r->rtm_dst_len) {
 321                 fprintf(fp, "0/%d ", r->rtm_dst_len);
 322         } else {
 323                 fprintf(fp, "default ");
 324         }
 325         if (tb[RTA_SRC]) {
 326                 if (r->rtm_src_len != host_len) {
 327                         fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
 328                                                          RTA_PAYLOAD(tb[RTA_SRC]),
 329                                                          RTA_DATA(tb[RTA_SRC]),
 330                                                          abuf, sizeof(abuf)),
 331                                 r->rtm_src_len
 332                                 );
 333                 } else {
 334                         fprintf(fp, "from %s ", format_host(r->rtm_family,
 335                                                        RTA_PAYLOAD(tb[RTA_SRC]),
 336                                                        RTA_DATA(tb[RTA_SRC]),
 337                                                        abuf, sizeof(abuf))
 338                                 );
 339                 }
 340         } else if (r->rtm_src_len) {
 341                 fprintf(fp, "from 0/%u ", r->rtm_src_len);
 342         }
 343         if (r->rtm_tos && filter.tosmask != -1) {
 344                 SPRINT_BUF(b1);
 345                 fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 346         }
 347
 348         if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
 349                 fprintf(fp, "via %s ",
 350                         format_host(r->rtm_family,
 351                                     RTA_PAYLOAD(tb[RTA_GATEWAY]),
 352                                     RTA_DATA(tb[RTA_GATEWAY]),
 353                                     abuf, sizeof(abuf)));
 354         }
 355         if (tb[RTA_OIF] && filter.oifmask != -1)
 356                 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 357
 358         if (!(r->rtm_flags&RTM_F_CLONED)) {
 359                 if (table != RT_TABLE_MAIN && !filter.tb)
 360                         fprintf(fp, " table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
 361                 if (r->rtm_protocol != RTPROT_BOOT && filter.protocolmask != -1)
 362                         fprintf(fp, " proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
 363                 if (r->rtm_scope != RT_SCOPE_UNIVERSE && filter.scopemask != -1)
 364                         fprintf(fp, " scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
 365         }
 366         if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
 367                 /* Do not use format_host(). It is our local addr
 368                    and symbolic name will not be useful.
 369                  */
 370                 fprintf(fp, " src %s ",
 371                         rt_addr_n2a(r->rtm_family,
 372                                     RTA_PAYLOAD(tb[RTA_PREFSRC]),
 373                                     RTA_DATA(tb[RTA_PREFSRC]),
 374                                     abuf, sizeof(abuf)));
 375         }
 376         if (tb[RTA_PRIORITY])
 377                 fprintf(fp, " metric %d ", *(__u32*)RTA_DATA(tb[RTA_PRIORITY]));
 378         if (r->rtm_flags & RTNH_F_DEAD)
 379                 fprintf(fp, "dead ");
 380         if (r->rtm_flags & RTNH_F_ONLINK)
 381                 fprintf(fp, "onlink ");
 382         if (r->rtm_flags & RTNH_F_PERVASIVE)
 383                 fprintf(fp, "pervasive ");
 384         if (r->rtm_flags & RTM_F_NOTIFY)
 385                 fprintf(fp, "notify ");
 386
 387         if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
 388                 __u32 to = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
 389                 __u32 from = to>>16;
 390                 to &= 0xFFFF;
 391                 fprintf(fp, "realm%s ", from ? "s" : "");
 392                 if (from) {
 393                         fprintf(fp, "%s/",
 394                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 395                 }
 396                 fprintf(fp, "%s ",
 397                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 398         }
 399         if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
 400                 __u32 flags = r->rtm_flags&~0xFFFF;
 401                 int first = 1;
 402
 403                 fprintf(fp, "%s    cache ", _SL_);
 404
 405 #define PRTFL(fl,flname) if (flags&RTCF_##fl) { \
 406   flags &= ~RTCF_##fl; \
 407   fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
 408   first = 0; }
 409                 PRTFL(LOCAL, "local");
 410                 PRTFL(REJECT, "reject");
 411                 PRTFL(MULTICAST, "mc");
 412                 PRTFL(BROADCAST, "brd");
 413                 PRTFL(DNAT, "dst-nat");
 414                 PRTFL(SNAT, "src-nat");
 415                 PRTFL(MASQ, "masq");
 416                 PRTFL(DIRECTDST, "dst-direct");
 417                 PRTFL(DIRECTSRC, "src-direct");
 418                 PRTFL(REDIRECTED, "redirected");
 419                 PRTFL(DOREDIRECT, "redirect");
 420                 PRTFL(FAST, "fastroute");
 421                 PRTFL(NOTIFY, "notify");
 422                 PRTFL(TPROXY, "proxy");
 423
 424                 if (flags)
 425                         fprintf(fp, "%s%x> ", first ? "<" : "", flags);
 426                 if (tb[RTA_CACHEINFO]) {
 427                         struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
 428                         if (!hz)
 429                                 hz = get_user_hz();
 430                         if (ci->rta_expires != 0)
 431                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 432                         if (ci->rta_error != 0)
 433                                 fprintf(fp, " error %d", ci->rta_error);
 434                         if (show_stats) {
 435                                 if (ci->rta_clntref)
 436                                         fprintf(fp, " users %d", ci->rta_clntref);
 437                                 if (ci->rta_used != 0)
 438                                         fprintf(fp, " used %d", ci->rta_used);
 439                                 if (ci->rta_lastuse != 0)
 440                                         fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
 441                         }
 442 #ifdef RTNETLINK_HAVE_PEERINFO
 443                         if (ci->rta_id)
 444                                 fprintf(fp, " ipid 0x%04x", ci->rta_id);
 445                         if (ci->rta_ts || ci->rta_tsage)
 446                                 fprintf(fp, " ts 0x%x tsage %dsec", ci->rta_ts, ci->rta_tsage);
 447 #endif
 448                 }
 449         } else if (r->rtm_family == AF_INET6) {
 450                 struct rta_cacheinfo *ci = NULL;
 451                 if (tb[RTA_CACHEINFO])
 452                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 453                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 454                         if (!hz)
 455                                 hz = get_user_hz();
 456                         if (r->rtm_flags & RTM_F_CLONED)
 457                                 fprintf(fp, "%s    cache ", _SL_);
 458                         if (ci->rta_expires)
 459                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 460                         if (ci->rta_error != 0)
 461                                 fprintf(fp, " error %d", ci->rta_error);
 462                         if (show_stats) {
 463                                 if (ci->rta_clntref)
 464                                         fprintf(fp, " users %d", ci->rta_clntref);
 465                                 if (ci->rta_used != 0)
 466                                         fprintf(fp, " used %d", ci->rta_used);
 467                                 if (ci->rta_lastuse != 0)
 468                                         fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
 469                         }
 470                 } else if (ci) {
 471                         if (ci->rta_error != 0)
 472                                 fprintf(fp, " error %d", ci->rta_error);
 473                 }
 474         }
 475         if (tb[RTA_METRICS]) {
 476                 int i;
 477                 unsigned mxlock = 0;
 478                 struct rtattr *mxrta[RTAX_MAX+1];
 479
 480                 parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
 481                             RTA_PAYLOAD(tb[RTA_METRICS]));
 482                 if (mxrta[RTAX_LOCK])
 483                         mxlock = *(unsigned*)RTA_DATA(mxrta[RTAX_LOCK]);
 484
 485                 for (i=2; i<= RTAX_MAX; i++) {
 486                         unsigned val;
 487
 488                         if (mxrta[i] == NULL)
 489                                 continue;
 490                         if (!hz)
 491                                 hz = get_hz();
 492
 493                         if (i < sizeof(mx_names)/sizeof(char*) && mx_names[i])
 494                                 fprintf(fp, " %s", mx_names[i]);
 495                         else
 496                                 fprintf(fp, " metric %d", i);
 497                         if (mxlock & (1<<i))
 498                                 fprintf(fp, " lock");
 499
 500                         val = *(unsigned*)RTA_DATA(mxrta[i]);
 501                         switch (i) {
 502                         case RTAX_HOPLIMIT:
 503                                 if ((long)val == -1)
 504                                         val = 0;
 505                                 /* fall through */
 506                         default:
 507                                 fprintf(fp, " %u", val);
 508                                 break;
 509
 510                         case RTAX_RTT:
 511                         case RTAX_RTTVAR:
 512                         case RTAX_RTO_MIN:
 513                                 val *= 1000;
 514                                 if (i == RTAX_RTT)
 515                                         val /= 8;
 516                                 else if (i == RTAX_RTTVAR)
 517                                         val /= 4;
 518
 519                                 if (val >= hz)
 520                                         fprintf(fp, " %llums",
 521                                                 (unsigned long long) val / hz);
 522                                 else
 523                                         fprintf(fp, " %.2fms",
 524                                                 (double)val / hz);
 525                         }
 526                 }
 527         }
 528         if (tb[RTA_IIF] && filter.iifmask != -1) {
 529                 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 530         }
 531         if (tb[RTA_MULTIPATH]) {
 532                 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
 533                 int first = 0;
 534
 535                 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
 536
 537                 for (;;) {
 538                         if (len < sizeof(*nh))
 539                                 break;
 540                         if (nh->rtnh_len > len)
 541                                 break;
 542                         if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
 543                                 if (first)
 544                                         fprintf(fp, " Oifs:");
 545                                 else
 546                                         fprintf(fp, " ");
 547                         } else
 548                                 fprintf(fp, "%s\tnexthop", _SL_);
 549                         if (nh->rtnh_len > sizeof(*nh)) {
 550                                 parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
 551                                 if (tb[RTA_GATEWAY]) {
 552                                         fprintf(fp, " via %s ",
 553                                                 format_host(r->rtm_family,
 554                                                             RTA_PAYLOAD(tb[RTA_GATEWAY]),
 555                                                             RTA_DATA(tb[RTA_GATEWAY]),
 556                                                             abuf, sizeof(abuf)));
 557                                 }
 558                                 if (tb[RTA_FLOW]) {
 559                                         __u32 to = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
 560                                         __u32 from = to>>16;
 561                                         to &= 0xFFFF;
 562                                         fprintf(fp, " realm%s ", from ? "s" : "");
 563                                         if (from) {
 564                                                 fprintf(fp, "%s/",
 565                                                         rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 566                                         }
 567                                         fprintf(fp, "%s",
 568                                                 rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 569                                 }
 570                         }
 571                         if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
 572                                 fprintf(fp, " %s", ll_index_to_name(nh->rtnh_ifindex));
 573                                 if (nh->rtnh_hops != 1)
 574                                         fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
 575                         } else {
 576                                 fprintf(fp, " dev %s", ll_index_to_name(nh->rtnh_ifindex));
 577                                 fprintf(fp, " weight %d", nh->rtnh_hops+1);
 578                         }
 579                         if (nh->rtnh_flags & RTNH_F_DEAD)
 580                                 fprintf(fp, " dead");
 581                         if (nh->rtnh_flags & RTNH_F_ONLINK)
 582                                 fprintf(fp, " onlink");
 583                         if (nh->rtnh_flags & RTNH_F_PERVASIVE)
 584                                 fprintf(fp, " pervasive");
 585                         len -= NLMSG_ALIGN(nh->rtnh_len);
 586                         nh = RTNH_NEXT(nh);
 587                 }
 588         }
 589         fprintf(fp, "\n");
 590         fflush(fp);
 591         return 0;
 592 }
 593
 594
 595 int parse_one_nh(struct rtattr *rta, struct rtnexthop *rtnh, int *argcp, char ***argvp)
 596 {
 597         int argc = *argcp;
 598         char **argv = *argvp;
 599
 600         while (++argv, --argc > 0) {
 601                 if (strcmp(*argv, "via") == 0) {
 602                         NEXT_ARG();
 603                         rta_addattr32(rta, 4096, RTA_GATEWAY, get_addr32(*argv));
 604                         rtnh->rtnh_len += sizeof(struct rtattr) + 4;
 605                 } else if (strcmp(*argv, "dev") == 0) {
 606                         NEXT_ARG();
 607                         if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
 608                                 fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
 609                                 exit(1);
 610                         }
 611                 } else if (strcmp(*argv, "weight") == 0) {
 612                         unsigned w;
 613                         NEXT_ARG();
 614                         if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
 615                                 invarg("\"weight\" is invalid\n", *argv);
 616                         rtnh->rtnh_hops = w - 1;
 617                 } else if (strcmp(*argv, "onlink") == 0) {
 618                         rtnh->rtnh_flags |= RTNH_F_ONLINK;
 619                 } else if (matches(*argv, "realms") == 0) {
 620                         __u32 realm;
 621                         NEXT_ARG();
 622                         if (get_rt_realms(&realm, *argv))
 623                                 invarg("\"realm\" value is invalid\n", *argv);
 624                         rta_addattr32(rta, 4096, RTA_FLOW, realm);
 625                         rtnh->rtnh_len += sizeof(struct rtattr) + 4;
 626                 } else
 627                         break;
 628         }
 629         *argcp = argc;
 630         *argvp = argv;
 631         return 0;
 632 }
 633
 634 int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r, int argc, char **argv)
 635 {
 636         char buf[1024];
 637         struct rtattr *rta = (void*)buf;
 638         struct rtnexthop *rtnh;
 639
 640         rta->rta_type = RTA_MULTIPATH;
 641         rta->rta_len = RTA_LENGTH(0);
 642         rtnh = RTA_DATA(rta);
 643
 644         while (argc > 0) {
 645                 if (strcmp(*argv, "nexthop") != 0) {
 646                         fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
 647                         exit(-1);
 648                 }
 649                 if (argc <= 1) {
 650                         fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
 651                         exit(-1);
 652                 }
 653                 memset(rtnh, 0, sizeof(*rtnh));
 654                 rtnh->rtnh_len = sizeof(*rtnh);
 655                 rta->rta_len += rtnh->rtnh_len;
 656                 parse_one_nh(rta, rtnh, &argc, &argv);
 657                 rtnh = RTNH_NEXT(rtnh);
 658         }
 659
 660         if (rta->rta_len > RTA_LENGTH(0))
 661                 addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
 662         return 0;
 663 }
 664
 665
 666 int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
 667 {
 668         struct {
 669                 struct nlmsghdr         n;
 670                 struct rtmsg            r;
 671                 char                    buf[1024];
 672         } req;
 673         char  mxbuf[256];
 674         struct rtattr * mxrta = (void*)mxbuf;
 675         unsigned mxlock = 0;
 676         char  *d = NULL;
 677         int gw_ok = 0;
 678         int dst_ok = 0;
 679         int nhs_ok = 0;
 680         int scope_ok = 0;
 681         int table_ok = 0;
 682         int proto_ok = 0;
 683         int type_ok = 0;
 684         int raw = 0;
 685
 686         memset(&req, 0, sizeof(req));
 687
 688         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 689         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 690         req.n.nlmsg_type = cmd;
 691         req.r.rtm_family = preferred_family;
 692         req.r.rtm_table = RT_TABLE_MAIN;
 693         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 694
 695         if (cmd != RTM_DELROUTE) {
 696                 req.r.rtm_protocol = RTPROT_BOOT;
 697                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 698                 req.r.rtm_type = RTN_UNICAST;
 699         }
 700
 701         mxrta->rta_type = RTA_METRICS;
 702         mxrta->rta_len = RTA_LENGTH(0);
 703
 704         while (argc > 0) {
 705                 if (strcmp(*argv, "src") == 0) {
 706                         inet_prefix addr;
 707                         NEXT_ARG();
 708                         get_addr(&addr, *argv, req.r.rtm_family);
 709                         if (req.r.rtm_family == AF_UNSPEC)
 710                                 req.r.rtm_family = addr.family;
 711                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 712                 } else if (strcmp(*argv, "via") == 0) {
 713                         inet_prefix addr;
 714                         gw_ok = 1;
 715                         NEXT_ARG();
 716                         get_addr(&addr, *argv, req.r.rtm_family);
 717                         if (req.r.rtm_family == AF_UNSPEC)
 718                                 req.r.rtm_family = addr.family;
 719                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 720                 } else if (strcmp(*argv, "from") == 0) {
 721                         inet_prefix addr;
 722                         NEXT_ARG();
 723                         get_prefix(&addr, *argv, req.r.rtm_family);
 724                         if (req.r.rtm_family == AF_UNSPEC)
 725                                 req.r.rtm_family = addr.family;
 726                         if (addr.bytelen)
 727                                 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 728                         req.r.rtm_src_len = addr.bitlen;
 729                 } else if (strcmp(*argv, "tos") == 0 ||
 730                            matches(*argv, "dsfield") == 0) {
 731                         __u32 tos;
 732                         NEXT_ARG();
 733                         if (rtnl_dsfield_a2n(&tos, *argv))
 734                                 invarg("\"tos\" value is invalid\n", *argv);
 735                         req.r.rtm_tos = tos;
 736                 } else if (matches(*argv, "metric") == 0 ||
 737                            matches(*argv, "priority") == 0 ||
 738                            matches(*argv, "preference") == 0) {
 739                         __u32 metric;
 740                         NEXT_ARG();
 741                         if (get_u32(&metric, *argv, 0))
 742                                 invarg("\"metric\" value is invalid\n", *argv);
 743                         addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
 744                 } else if (strcmp(*argv, "scope") == 0) {
 745                         __u32 scope = 0;
 746                         NEXT_ARG();
 747                         if (rtnl_rtscope_a2n(&scope, *argv))
 748                                 invarg("invalid \"scope\" value\n", *argv);
 749                         req.r.rtm_scope = scope;
 750                         scope_ok = 1;
 751                 } else if (strcmp(*argv, "mtu") == 0) {
 752                         unsigned mtu;
 753                         NEXT_ARG();
 754                         if (strcmp(*argv, "lock") == 0) {
 755                                 mxlock |= (1<<RTAX_MTU);
 756                                 NEXT_ARG();
 757                         }
 758                         if (get_unsigned(&mtu, *argv, 0))
 759                                 invarg("\"mtu\" value is invalid\n", *argv);
 760                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 761 #ifdef RTAX_HOPLIMIT
 762                 } else if (strcmp(*argv, "hoplimit") == 0) {
 763                         unsigned hoplimit;
 764                         NEXT_ARG();
 765                         if (strcmp(*argv, "lock") == 0) {
 766                                 mxlock |= (1<<RTAX_HOPLIMIT);
 767                                 NEXT_ARG();
 768                         }
 769                         if (get_unsigned(&hoplimit, *argv, 0))
 770                                 invarg("\"hoplimit\" value is invalid\n", *argv);
 771                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
 772 #endif
 773 #ifdef RTAX_ADVMSS
 774                 } else if (strcmp(*argv, "advmss") == 0) {
 775                         unsigned mss;
 776                         NEXT_ARG();
 777                         if (strcmp(*argv, "lock") == 0) {
 778                                 mxlock |= (1<<RTAX_ADVMSS);
 779                                 NEXT_ARG();
 780                         }
 781                         if (get_unsigned(&mss, *argv, 0))
 782                                 invarg("\"mss\" value is invalid\n", *argv);
 783                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
 784 #endif
 785 #ifdef RTAX_REORDERING
 786                 } else if (matches(*argv, "reordering") == 0) {
 787                         unsigned reord;
 788                         NEXT_ARG();
 789                         if (strcmp(*argv, "lock") == 0) {
 790                                 mxlock |= (1<<RTAX_REORDERING);
 791                                 NEXT_ARG();
 792                         }
 793                         if (get_unsigned(&reord, *argv, 0))
 794                                 invarg("\"reordering\" value is invalid\n", *argv);
 795                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
 796 #endif
 797                 } else if (strcmp(*argv, "rtt") == 0) {
 798                         unsigned rtt;
 799                         NEXT_ARG();
 800                         if (strcmp(*argv, "lock") == 0) {
 801                                 mxlock |= (1<<RTAX_RTT);
 802                                 NEXT_ARG();
 803                         }
 804                         if (get_jiffies(&rtt, *argv, 0, &raw))
 805                                 invarg("\"rtt\" value is invalid\n", *argv);
 806                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
 807                                 (raw) ? rtt : rtt * 8);
 808                 } else if (strcmp(*argv, "rto_min") == 0) {
 809                         unsigned rto_min;
 810                         NEXT_ARG();
 811                         mxlock |= (1<<RTAX_RTO_MIN);
 812                         if (get_jiffies(&rto_min, *argv, 0, &raw))
 813                                 invarg("\"rto_min\" value is invalid\n",
 814                                        *argv);
 815                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
 816                                       rto_min);
 817                 } else if (matches(*argv, "window") == 0) {
 818                         unsigned win;
 819                         NEXT_ARG();
 820                         if (strcmp(*argv, "lock") == 0) {
 821                                 mxlock |= (1<<RTAX_WINDOW);
 822                                 NEXT_ARG();
 823                         }
 824                         if (get_unsigned(&win, *argv, 0))
 825                                 invarg("\"window\" value is invalid\n", *argv);
 826                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
 827                 } else if (matches(*argv, "cwnd") == 0) {
 828                         unsigned win;
 829                         NEXT_ARG();
 830                         if (strcmp(*argv, "lock") == 0) {
 831                                 mxlock |= (1<<RTAX_CWND);
 832                                 NEXT_ARG();
 833                         }
 834                         if (get_unsigned(&win, *argv, 0))
 835                                 invarg("\"cwnd\" value is invalid\n", *argv);
 836                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
 837                 } else if (matches(*argv, "initcwnd") == 0) {
 838                         unsigned win;
 839                         NEXT_ARG();
 840                         if (strcmp(*argv, "lock") == 0) {
 841                                 mxlock |= (1<<RTAX_INITCWND);
 842                                 NEXT_ARG();
 843                         }
 844                         if (get_unsigned(&win, *argv, 0))
 845                                 invarg("\"initcwnd\" value is invalid\n", *argv);
 846                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
 847                 } else if (matches(*argv, "rttvar") == 0) {
 848                         unsigned win;
 849                         NEXT_ARG();
 850                         if (strcmp(*argv, "lock") == 0) {
 851                                 mxlock |= (1<<RTAX_RTTVAR);
 852                                 NEXT_ARG();
 853                         }
 854                         if (get_jiffies(&win, *argv, 0, &raw))
 855                                 invarg("\"rttvar\" value is invalid\n", *argv);
 856                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
 857                                 (raw) ? win : win * 4);
 858                 } else if (matches(*argv, "ssthresh") == 0) {
 859                         unsigned win;
 860                         NEXT_ARG();
 861                         if (strcmp(*argv, "lock") == 0) {
 862                                 mxlock |= (1<<RTAX_SSTHRESH);
 863                                 NEXT_ARG();
 864                         }
 865                         if (get_unsigned(&win, *argv, 0))
 866                                 invarg("\"ssthresh\" value is invalid\n", *argv);
 867                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
 868                 } else if (matches(*argv, "realms") == 0) {
 869                         __u32 realm;
 870                         NEXT_ARG();
 871                         if (get_rt_realms(&realm, *argv))
 872                                 invarg("\"realm\" value is invalid\n", *argv);
 873                         addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
 874                 } else if (strcmp(*argv, "onlink") == 0) {
 875                         req.r.rtm_flags |= RTNH_F_ONLINK;
 876                 } else if (strcmp(*argv, "nexthop") == 0) {
 877                         nhs_ok = 1;
 878                         break;
 879                 } else if (matches(*argv, "protocol") == 0) {
 880                         __u32 prot;
 881                         NEXT_ARG();
 882                         if (rtnl_rtprot_a2n(&prot, *argv))
 883                                 invarg("\"protocol\" value is invalid\n", *argv);
 884                         req.r.rtm_protocol = prot;
 885                         proto_ok =1;
 886                 } else if (matches(*argv, "table") == 0) {
 887                         __u32 tid;
 888                         NEXT_ARG();
 889                         if (rtnl_rttable_a2n(&tid, *argv))
 890                                 invarg("\"table\" value is invalid\n", *argv);
 891                         if (tid < 256)
 892                                 req.r.rtm_table = tid;
 893                         else {
 894                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 895                                 addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
 896                         }
 897                         table_ok = 1;
 898                 } else if (strcmp(*argv, "dev") == 0 ||
 899                            strcmp(*argv, "oif") == 0) {
 900                         NEXT_ARG();
 901                         d = *argv;
 902                 } else {
 903                         int type;
 904                         inet_prefix dst;
 905
 906                         if (strcmp(*argv, "to") == 0) {
 907                                 NEXT_ARG();
 908                         }
 909                         if ((**argv < '0' || **argv > '9') &&
 910                             rtnl_rtntype_a2n(&type, *argv) == 0) {
 911                                 NEXT_ARG();
 912                                 req.r.rtm_type = type;
 913                                 type_ok = 1;
 914                         }
 915
 916                         if (matches(*argv, "help") == 0)
 917                                 usage();
 918                         if (dst_ok)
 919                                 duparg2("to", *argv);
 920                         get_prefix(&dst, *argv, req.r.rtm_family);
 921                         if (req.r.rtm_family == AF_UNSPEC)
 922                                 req.r.rtm_family = dst.family;
 923                         req.r.rtm_dst_len = dst.bitlen;
 924                         dst_ok = 1;
 925                         if (dst.bytelen)
 926                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 927                 }
 928                 argc--; argv++;
 929         }
 930
 931         if (d || nhs_ok)  {
 932                 int idx;
 933
 934                 ll_init_map(&rth);
 935
 936                 if (d) {
 937                         if ((idx = ll_name_to_index(d)) == 0) {
 938                                 fprintf(stderr, "Cannot find device \"%s\"\n", d);
 939                                 return -1;
 940                         }
 941                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 942                 }
 943         }
 944
 945         if (mxrta->rta_len > RTA_LENGTH(0)) {
 946                 if (mxlock)
 947                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 948                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 949         }
 950
 951         if (nhs_ok)
 952                 parse_nexthops(&req.n, &req.r, argc, argv);
 953
 954         if (!table_ok) {
 955                 if (req.r.rtm_type == RTN_LOCAL ||
 956                     req.r.rtm_type == RTN_BROADCAST ||
 957                     req.r.rtm_type == RTN_NAT ||
 958                     req.r.rtm_type == RTN_ANYCAST)
 959                         req.r.rtm_table = RT_TABLE_LOCAL;
 960         }
 961         if (!scope_ok) {
 962                 if (req.r.rtm_type == RTN_LOCAL ||
 963                     req.r.rtm_type == RTN_NAT)
 964                         req.r.rtm_scope = RT_SCOPE_HOST;
 965                 else if (req.r.rtm_type == RTN_BROADCAST ||
 966                          req.r.rtm_type == RTN_MULTICAST ||
 967                          req.r.rtm_type == RTN_ANYCAST)
 968                         req.r.rtm_scope = RT_SCOPE_LINK;
 969                 else if (req.r.rtm_type == RTN_UNICAST ||
 970                          req.r.rtm_type == RTN_UNSPEC) {
 971                         if (cmd == RTM_DELROUTE)
 972                                 req.r.rtm_scope = RT_SCOPE_NOWHERE;
 973                         else if (!gw_ok && !nhs_ok)
 974                                 req.r.rtm_scope = RT_SCOPE_LINK;
 975                 }
 976         }
 977
 978         if (req.r.rtm_family == AF_UNSPEC)
 979                 req.r.rtm_family = AF_INET;
 980
 981         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 982                 exit(2);
 983
 984         return 0;
 985 }
 986
 987 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 988 {
 989         struct {
 990                 struct nlmsghdr nlh;
 991                 struct rtmsg rtm;
 992         } req;
 993         struct sockaddr_nl nladdr;
 994
 995         memset(&nladdr, 0, sizeof(nladdr));
 996         memset(&req, 0, sizeof(req));
 997         nladdr.nl_family = AF_NETLINK;
 998
 999         req.nlh.nlmsg_len = sizeof(req);
1000         req.nlh.nlmsg_type = RTM_GETROUTE;
1001         req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
1002         req.nlh.nlmsg_pid = 0;
1003         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
1004         req.rtm.rtm_family = family;
1005         req.rtm.rtm_flags |= RTM_F_CLONED;
1006
1007         return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
1008 }
1009
1010 static int iproute_flush_cache(void)
1011 {
1012 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1013
1014         int len;
1015         int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
1016         char *buffer = "-1";
1017
1018         if (flush_fd < 0) {
1019                 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
1020                 return -1;
1021         }
1022
1023         len = strlen (buffer);
1024
1025         if ((write (flush_fd, (void *)buffer, len)) < len) {
1026                 fprintf (stderr, "Cannot flush routing cache\n");
1027                 return -1;
1028         }
1029         close(flush_fd);
1030         return 0;
1031 }
1032
1033
1034 static int iproute_list_or_flush(int argc, char **argv, int flush)
1035 {
1036         int do_ipv6 = preferred_family;
1037         char *id = NULL;
1038         char *od = NULL;
1039
1040         iproute_reset_filter();
1041         filter.tb = RT_TABLE_MAIN;
1042
1043         if (flush && argc <= 0) {
1044                 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1045                 return -1;
1046         }
1047
1048         while (argc > 0) {
1049                 if (matches(*argv, "table") == 0) {
1050                         __u32 tid;
1051                         NEXT_ARG();
1052                         if (rtnl_rttable_a2n(&tid, *argv)) {
1053                                 if (strcmp(*argv, "all") == 0) {
1054                                         filter.tb = 0;
1055                                 } else if (strcmp(*argv, "cache") == 0) {
1056                                         filter.cloned = 1;
1057                                 } else if (strcmp(*argv, "help") == 0) {
1058                                         usage();
1059                                 } else {
1060                                         invarg("table id value is invalid\n", *argv);
1061                                 }
1062                         } else
1063                                 filter.tb = tid;
1064                 } else if (matches(*argv, "cached") == 0 ||
1065                            matches(*argv, "cloned") == 0) {
1066                         filter.cloned = 1;
1067                 } else if (strcmp(*argv, "tos") == 0 ||
1068                            matches(*argv, "dsfield") == 0) {
1069                         __u32 tos;
1070                         NEXT_ARG();
1071                         if (rtnl_dsfield_a2n(&tos, *argv))
1072                                 invarg("TOS value is invalid\n", *argv);
1073                         filter.tos = tos;
1074                         filter.tosmask = -1;
1075                 } else if (matches(*argv, "protocol") == 0) {
1076                         __u32 prot = 0;
1077                         NEXT_ARG();
1078                         filter.protocolmask = -1;
1079                         if (rtnl_rtprot_a2n(&prot, *argv)) {
1080                                 if (strcmp(*argv, "all") != 0)
1081                                         invarg("invalid \"protocol\"\n", *argv);
1082                                 prot = 0;
1083                                 filter.protocolmask = 0;
1084                         }
1085                         filter.protocol = prot;
1086                 } else if (matches(*argv, "scope") == 0) {
1087                         __u32 scope = 0;
1088                         NEXT_ARG();
1089                         filter.scopemask = -1;
1090                         if (rtnl_rtscope_a2n(&scope, *argv)) {
1091                                 if (strcmp(*argv, "all") != 0)
1092                                         invarg("invalid \"scope\"\n", *argv);
1093                                 scope = RT_SCOPE_NOWHERE;
1094                                 filter.scopemask = 0;
1095                         }
1096                         filter.scope = scope;
1097                 } else if (matches(*argv, "type") == 0) {
1098                         int type;
1099                         NEXT_ARG();
1100                         filter.typemask = -1;
1101                         if (rtnl_rtntype_a2n(&type, *argv))
1102                                 invarg("node type value is invalid\n", *argv);
1103                         filter.type = type;
1104                 } else if (strcmp(*argv, "dev") == 0 ||
1105                            strcmp(*argv, "oif") == 0) {
1106                         NEXT_ARG();
1107                         od = *argv;
1108                 } else if (strcmp(*argv, "iif") == 0) {
1109                         NEXT_ARG();
1110                         id = *argv;
1111                 } else if (strcmp(*argv, "via") == 0) {
1112                         NEXT_ARG();
1113                         get_prefix(&filter.rvia, *argv, do_ipv6);
1114                 } else if (strcmp(*argv, "src") == 0) {
1115                         NEXT_ARG();
1116                         get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1117                 } else if (matches(*argv, "realms") == 0) {
1118                         __u32 realm;
1119                         NEXT_ARG();
1120                         if (get_rt_realms(&realm, *argv))
1121                                 invarg("invalid realms\n", *argv);
1122                         filter.realm = realm;
1123                         filter.realmmask = ~0U;
1124                         if ((filter.realm&0xFFFF) == 0 &&
1125                             (*argv)[strlen(*argv) - 1] == '/')
1126                                 filter.realmmask &= ~0xFFFF;
1127                         if ((filter.realm&0xFFFF0000U) == 0 &&
1128                             (strchr(*argv, '/') == NULL ||
1129                              (*argv)[0] == '/'))
1130                                 filter.realmmask &= ~0xFFFF0000U;
1131                 } else if (matches(*argv, "from") == 0) {
1132                         NEXT_ARG();
1133                         if (matches(*argv, "root") == 0) {
1134                                 NEXT_ARG();
1135                                 get_prefix(&filter.rsrc, *argv, do_ipv6);
1136                         } else if (matches(*argv, "match") == 0) {
1137                                 NEXT_ARG();
1138                                 get_prefix(&filter.msrc, *argv, do_ipv6);
1139                         } else {
1140                                 if (matches(*argv, "exact") == 0) {
1141                                         NEXT_ARG();
1142                                 }
1143                                 get_prefix(&filter.msrc, *argv, do_ipv6);
1144                                 filter.rsrc = filter.msrc;
1145                         }
1146                 } else {
1147                         if (matches(*argv, "to") == 0) {
1148                                 NEXT_ARG();
1149                         }
1150                         if (matches(*argv, "root") == 0) {
1151                                 NEXT_ARG();
1152                                 get_prefix(&filter.rdst, *argv, do_ipv6);
1153                         } else if (matches(*argv, "match") == 0) {
1154                                 NEXT_ARG();
1155                                 get_prefix(&filter.mdst, *argv, do_ipv6);
1156                         } else {
1157                                 if (matches(*argv, "exact") == 0) {
1158                                         NEXT_ARG();
1159                                 }
1160                                 get_prefix(&filter.mdst, *argv, do_ipv6);
1161                                 filter.rdst = filter.mdst;
1162                         }
1163                 }
1164                 argc--; argv++;
1165         }
1166
1167         if (do_ipv6 == AF_UNSPEC && filter.tb)
1168                 do_ipv6 = AF_INET;
1169
1170         ll_init_map(&rth);
1171
1172         if (id || od)  {
1173                 int idx;
1174
1175                 if (id) {
1176                         if ((idx = ll_name_to_index(id)) == 0) {
1177                                 fprintf(stderr, "Cannot find device \"%s\"\n", id);
1178                                 return -1;
1179                         }
1180                         filter.iif = idx;
1181                         filter.iifmask = -1;
1182                 }
1183                 if (od) {
1184                         if ((idx = ll_name_to_index(od)) == 0) {
1185                                 fprintf(stderr, "Cannot find device \"%s\"\n", od);
1186                                 return -1;
1187                         }
1188                         filter.oif = idx;
1189                         filter.oifmask = -1;
1190                 }
1191         }
1192
1193         if (flush) {
1194                 int round = 0;
1195                 char flushb[4096-512];
1196                 time_t start = time(0);
1197
1198                 if (filter.cloned) {
1199                         if (do_ipv6 != AF_INET6) {
1200                                 iproute_flush_cache();
1201                                 if (show_stats)
1202                                         printf("*** IPv4 routing cache is flushed.\n");
1203                         }
1204                         if (do_ipv6 == AF_INET)
1205                                 return 0;
1206                 }
1207
1208                 filter.flushb = flushb;
1209                 filter.flushp = 0;
1210                 filter.flushe = sizeof(flushb);
1211
1212                 for (;;) {
1213                         if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1214                                 perror("Cannot send dump request");
1215                                 exit(1);
1216                         }
1217                         filter.flushed = 0;
1218                         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
1219                                 fprintf(stderr, "Flush terminated\n");
1220                                 exit(1);
1221                         }
1222                         if (filter.flushed == 0) {
1223                                 if (show_stats) {
1224                                         if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1225                                                 printf("Nothing to flush.\n");
1226                                         else
1227                                                 printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
1228                                 }
1229                                 fflush(stdout);
1230                                 return 0;
1231                         }
1232                         round++;
1233                         if (flush_update() < 0)
1234                                 exit(1);
1235
1236                         if (time(0) - start > 30) {
1237                                 printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1238                                        time(0) - start, filter.flushed);
1239                                 exit(1);
1240                         }
1241
1242                         if (show_stats) {
1243                                 printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1244                                 fflush(stdout);
1245                         }
1246                 }
1247         }
1248
1249         if (!filter.cloned) {
1250                 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1251                         perror("Cannot send dump request");
1252                         exit(1);
1253                 }
1254         } else {
1255                 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1256                         perror("Cannot send dump request");
1257                         exit(1);
1258                 }
1259         }
1260
1261         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
1262                 fprintf(stderr, "Dump terminated\n");
1263                 exit(1);
1264         }
1265
1266         exit(0);
1267 }
1268
1269
1270 int iproute_get(int argc, char **argv)
1271 {
1272         struct {
1273                 struct nlmsghdr         n;
1274                 struct rtmsg            r;
1275                 char                    buf[1024];
1276         } req;
1277         char  *idev = NULL;
1278         char  *odev = NULL;
1279         int connected = 0;
1280         int from_ok = 0;
1281
1282         memset(&req, 0, sizeof(req));
1283
1284         iproute_reset_filter();
1285
1286         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
1287         req.n.nlmsg_flags = NLM_F_REQUEST;
1288         req.n.nlmsg_type = RTM_GETROUTE;
1289         req.r.rtm_family = preferred_family;
1290         req.r.rtm_table = 0;
1291         req.r.rtm_protocol = 0;
1292         req.r.rtm_scope = 0;
1293         req.r.rtm_type = 0;
1294         req.r.rtm_src_len = 0;
1295         req.r.rtm_dst_len = 0;
1296         req.r.rtm_tos = 0;
1297
1298         while (argc > 0) {
1299                 if (strcmp(*argv, "tos") == 0 ||
1300                     matches(*argv, "dsfield") == 0) {
1301                         __u32 tos;
1302                         NEXT_ARG();
1303                         if (rtnl_dsfield_a2n(&tos, *argv))
1304                                 invarg("TOS value is invalid\n", *argv);
1305                         req.r.rtm_tos = tos;
1306                 } else if (matches(*argv, "from") == 0) {
1307                         inet_prefix addr;
1308                         NEXT_ARG();
1309                         if (matches(*argv, "help") == 0)
1310                                 usage();
1311                         from_ok = 1;
1312                         get_prefix(&addr, *argv, req.r.rtm_family);
1313                         if (req.r.rtm_family == AF_UNSPEC)
1314                                 req.r.rtm_family = addr.family;
1315                         if (addr.bytelen)
1316                                 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1317                         req.r.rtm_src_len = addr.bitlen;
1318                 } else if (matches(*argv, "iif") == 0) {
1319                         NEXT_ARG();
1320                         idev = *argv;
1321                 } else if (matches(*argv, "oif") == 0 ||
1322                            strcmp(*argv, "dev") == 0) {
1323                         NEXT_ARG();
1324                         odev = *argv;
1325                 } else if (matches(*argv, "notify") == 0) {
1326                         req.r.rtm_flags |= RTM_F_NOTIFY;
1327                 } else if (matches(*argv, "connected") == 0) {
1328                         connected = 1;
1329                 } else {
1330                         inet_prefix addr;
1331                         if (strcmp(*argv, "to") == 0) {
1332                                 NEXT_ARG();
1333                         }
1334                         if (matches(*argv, "help") == 0)
1335                                 usage();
1336                         get_prefix(&addr, *argv, req.r.rtm_family);
1337                         if (req.r.rtm_family == AF_UNSPEC)
1338                                 req.r.rtm_family = addr.family;
1339                         if (addr.bytelen)
1340                                 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1341                         req.r.rtm_dst_len = addr.bitlen;
1342                 }
1343                 argc--; argv++;
1344         }
1345
1346         if (req.r.rtm_dst_len == 0) {
1347                 fprintf(stderr, "need at least destination address\n");
1348                 exit(1);
1349         }
1350
1351         ll_init_map(&rth);
1352
1353         if (idev || odev)  {
1354                 int idx;
1355
1356                 if (idev) {
1357                         if ((idx = ll_name_to_index(idev)) == 0) {
1358                                 fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1359                                 return -1;
1360                         }
1361                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1362                 }
1363                 if (odev) {
1364                         if ((idx = ll_name_to_index(odev)) == 0) {
1365                                 fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1366                                 return -1;
1367                         }
1368                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1369                 }
1370         }
1371
1372         if (req.r.rtm_family == AF_UNSPEC)
1373                 req.r.rtm_family = AF_INET;
1374
1375         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0)
1376                 exit(2);
1377
1378         if (connected && !from_ok) {
1379                 struct rtmsg *r = NLMSG_DATA(&req.n);
1380                 int len = req.n.nlmsg_len;
1381                 struct rtattr * tb[RTA_MAX+1];
1382
1383                 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1384                         fprintf(stderr, "An error :-)\n");
1385                         exit(1);
1386                 }
1387
1388                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
1389                         fprintf(stderr, "Not a route?\n");
1390                         return -1;
1391                 }
1392                 len -= NLMSG_LENGTH(sizeof(*r));
1393                 if (len < 0) {
1394                         fprintf(stderr, "Wrong len %d\n", len);
1395                         return -1;
1396                 }
1397
1398                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1399
1400                 if (tb[RTA_PREFSRC]) {
1401                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1402                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1403                 } else if (!tb[RTA_SRC]) {
1404                         fprintf(stderr, "Failed to connect the route\n");
1405                         return -1;
1406                 }
1407                 if (!odev && tb[RTA_OIF])
1408                         tb[RTA_OIF]->rta_type = 0;
1409                 if (tb[RTA_GATEWAY])
1410                         tb[RTA_GATEWAY]->rta_type = 0;
1411                 if (!idev && tb[RTA_IIF])
1412                         tb[RTA_IIF]->rta_type = 0;
1413                 req.n.nlmsg_flags = NLM_F_REQUEST;
1414                 req.n.nlmsg_type = RTM_GETROUTE;
1415
1416                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0)
1417                         exit(2);
1418         }
1419
1420         if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1421                 fprintf(stderr, "An error :-)\n");
1422                 exit(1);
1423         }
1424
1425         exit(0);
1426 }
1427
1428 void iproute_reset_filter()
1429 {
1430         memset(&filter, 0, sizeof(filter));
1431         filter.mdst.bitlen = -1;
1432         filter.msrc.bitlen = -1;
1433 }
1434
1435 int do_iproute(int argc, char **argv)
1436 {
1437         if (argc < 1)
1438                 return iproute_list_or_flush(0, NULL, 0);
1439
1440         if (matches(*argv, "add") == 0)
1441                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1442                                       argc-1, argv+1);
1443         if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1444                 return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1445                                       argc-1, argv+1);
1446         if (matches(*argv, "replace") == 0)
1447                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1448                                       argc-1, argv+1);
1449         if (matches(*argv, "prepend") == 0)
1450                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1451                                       argc-1, argv+1);
1452         if (matches(*argv, "append") == 0)
1453                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
1454                                       argc-1, argv+1);
1455         if (matches(*argv, "test") == 0)
1456                 return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
1457                                       argc-1, argv+1);
1458         if (matches(*argv, "delete") == 0)
1459                 return iproute_modify(RTM_DELROUTE, 0,
1460                                       argc-1, argv+1);
1461         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
1462             || matches(*argv, "lst") == 0)
1463                 return iproute_list_or_flush(argc-1, argv+1, 0);
1464         if (matches(*argv, "get") == 0)
1465                 return iproute_get(argc-1, argv+1);
1466         if (matches(*argv, "flush") == 0)
1467                 return iproute_list_or_flush(argc-1, argv+1, 1);
1468         if (matches(*argv, "help") == 0)
1469                 usage();
1470         fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
1471         exit(-1);
1472 }
1473