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         [RTAX_INITRWND] = "initrwnd",
  50 };
  51 static void usage(void) __attribute__((noreturn));
  52
  53 static void usage(void)
  54 {
  55         fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
  56         fprintf(stderr, "       ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
  57         fprintf(stderr, "                            [ oif STRING ]  [ tos TOS ]\n");
  58         fprintf(stderr, "       ip route { add | del | change | append | replace | monitor } ROUTE\n");
  59         fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
  60         fprintf(stderr, "            [ table TABLE_ID ] [ proto RTPROTO ]\n");
  61         fprintf(stderr, "            [ type TYPE ] [ scope SCOPE ]\n");
  62         fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
  63         fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
  64         fprintf(stderr, "             [ table TABLE_ID ] [ proto RTPROTO ]\n");
  65         fprintf(stderr, "             [ scope SCOPE ] [ metric METRIC ]\n");
  66         fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
  67         fprintf(stderr, "NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
  68         fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]\n");
  69         fprintf(stderr, "           [ rtt TIME ] [ rttvar TIME ] [reordering NUMBER ]\n");
  70         fprintf(stderr, "           [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
  71         fprintf(stderr, "           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
  72         fprintf(stderr, "           [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
  73         fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
  74         fprintf(stderr, "          unreachable | prohibit | blackhole | nat ]\n");
  75         fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
  76         fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
  77         fprintf(stderr, "MP_ALGO := { rr | drr | random | wrandom }\n");
  78         fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
  79         fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
  80         fprintf(stderr, "TIME := NUMBER[s|ms|us|ns|j]\n");
  81         exit(-1);
  82 }
  83
  84
  85 static struct
  86 {
  87         int tb;
  88         int cloned;
  89         int flushed;
  90         char *flushb;
  91         int flushp;
  92         int flushe;
  93         int protocol, protocolmask;
  94         int scope, scopemask;
  95         int type, typemask;
  96         int tos, tosmask;
  97         int iif, iifmask;
  98         int oif, oifmask;
  99         int realm, realmmask;
 100         inet_prefix rprefsrc;
 101         inet_prefix rvia;
 102         inet_prefix rdst;
 103         inet_prefix mdst;
 104         inet_prefix rsrc;
 105         inet_prefix msrc;
 106 } filter;
 107
 108 static int flush_update(void)
 109 {
 110         if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
 111                 perror("Failed to send flush request");
 112                 return -1;
 113         }
 114         filter.flushp = 0;
 115         return 0;
 116 }
 117
 118 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 119 {
 120         FILE *fp = (FILE*)arg;
 121         struct rtmsg *r = NLMSG_DATA(n);
 122         int len = n->nlmsg_len;
 123         struct rtattr * tb[RTA_MAX+1];
 124         char abuf[256];
 125         inet_prefix dst;
 126         inet_prefix src;
 127         inet_prefix prefsrc;
 128         inet_prefix via;
 129         int host_len = -1;
 130         static int ip6_multiple_tables;
 131         __u32 table;
 132         SPRINT_BUF(b1);
 133         static int hz;
 134
 135         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
 136                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
 137                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 138                 return 0;
 139         }
 140         if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
 141                 return 0;
 142         len -= NLMSG_LENGTH(sizeof(*r));
 143         if (len < 0) {
 144                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 145                 return -1;
 146         }
 147
 148         if (r->rtm_family == AF_INET6)
 149                 host_len = 128;
 150         else if (r->rtm_family == AF_INET)
 151                 host_len = 32;
 152         else if (r->rtm_family == AF_DECnet)
 153                 host_len = 16;
 154         else if (r->rtm_family == AF_IPX)
 155                 host_len = 80;
 156
 157         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 158         table = rtm_get_table(r, tb);
 159
 160         if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
 161                 ip6_multiple_tables = 1;
 162
 163         if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
 164                 if (filter.cloned) {
 165                         if (!(r->rtm_flags&RTM_F_CLONED))
 166                                 return 0;
 167                 }
 168                 if (filter.tb) {
 169                         if (!filter.cloned && r->rtm_flags&RTM_F_CLONED)
 170                                 return 0;
 171                         if (filter.tb == RT_TABLE_LOCAL) {
 172                                 if (r->rtm_type != RTN_LOCAL)
 173                                         return 0;
 174                         } else if (filter.tb == RT_TABLE_MAIN) {
 175                                 if (r->rtm_type == RTN_LOCAL)
 176                                         return 0;
 177                         } else {
 178                                 return 0;
 179                         }
 180                 }
 181         } else {
 182                 if (filter.cloned) {
 183                         if (!(r->rtm_flags&RTM_F_CLONED))
 184                                 return 0;
 185                 }
 186                 if (filter.tb > 0 && filter.tb != table)
 187                         return 0;
 188         }
 189         if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
 190                 return 0;
 191         if ((filter.scope^r->rtm_scope)&filter.scopemask)
 192                 return 0;
 193         if ((filter.type^r->rtm_type)&filter.typemask)
 194                 return 0;
 195         if ((filter.tos^r->rtm_tos)&filter.tosmask)
 196                 return 0;
 197         if (filter.rdst.family &&
 198             (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
 199                 return 0;
 200         if (filter.mdst.family &&
 201             (r->rtm_family != filter.mdst.family ||
 202              (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
 203                 return 0;
 204         if (filter.rsrc.family &&
 205             (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
 206                 return 0;
 207         if (filter.msrc.family &&
 208             (r->rtm_family != filter.msrc.family ||
 209              (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
 210                 return 0;
 211         if (filter.rvia.family && r->rtm_family != filter.rvia.family)
 212                 return 0;
 213         if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
 214                 return 0;
 215
 216         memset(&dst, 0, sizeof(dst));
 217         dst.family = r->rtm_family;
 218         if (tb[RTA_DST])
 219                 memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
 220         if (filter.rsrc.family || filter.msrc.family) {
 221                 memset(&src, 0, sizeof(src));
 222                 src.family = r->rtm_family;
 223                 if (tb[RTA_SRC])
 224                         memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
 225         }
 226         if (filter.rvia.bitlen>0) {
 227                 memset(&via, 0, sizeof(via));
 228                 via.family = r->rtm_family;
 229                 if (tb[RTA_GATEWAY])
 230                         memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
 231         }
 232         if (filter.rprefsrc.bitlen>0) {
 233                 memset(&prefsrc, 0, sizeof(prefsrc));
 234                 prefsrc.family = r->rtm_family;
 235                 if (tb[RTA_PREFSRC])
 236                         memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
 237         }
 238
 239         if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
 240                 return 0;
 241         if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
 242             inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
 243                 return 0;
 244
 245         if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
 246                 return 0;
 247         if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
 248             inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
 249                 return 0;
 250
 251         if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
 252                 return 0;
 253         if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
 254                 return 0;
 255         if (filter.realmmask) {
 256                 __u32 realms = 0;
 257                 if (tb[RTA_FLOW])
 258                         realms = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
 259                 if ((realms^filter.realm)&filter.realmmask)
 260                         return 0;
 261         }
 262         if (filter.iifmask) {
 263                 int iif = 0;
 264                 if (tb[RTA_IIF])
 265                         iif = *(int*)RTA_DATA(tb[RTA_IIF]);
 266                 if ((iif^filter.iif)&filter.iifmask)
 267                         return 0;
 268         }
 269         if (filter.oifmask) {
 270                 int oif = 0;
 271                 if (tb[RTA_OIF])
 272                         oif = *(int*)RTA_DATA(tb[RTA_OIF]);
 273                 if ((oif^filter.oif)&filter.oifmask)
 274                         return 0;
 275         }
 276         if (filter.flushb &&
 277             r->rtm_family == AF_INET6 &&
 278             r->rtm_dst_len == 0 &&
 279             r->rtm_type == RTN_UNREACHABLE &&
 280             tb[RTA_PRIORITY] &&
 281             *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
 282                 return 0;
 283
 284         if (filter.flushb) {
 285                 struct nlmsghdr *fn;
 286                 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
 287                         if (flush_update())
 288                                 return -1;
 289                 }
 290                 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
 291                 memcpy(fn, n, n->nlmsg_len);
 292                 fn->nlmsg_type = RTM_DELROUTE;
 293                 fn->nlmsg_flags = NLM_F_REQUEST;
 294                 fn->nlmsg_seq = ++rth.seq;
 295                 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
 296                 filter.flushed++;
 297                 if (show_stats < 2)
 298                         return 0;
 299         }
 300
 301         if (n->nlmsg_type == RTM_DELROUTE)
 302                 fprintf(fp, "Deleted ");
 303         if (r->rtm_type != RTN_UNICAST && !filter.type)
 304                 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
 305
 306         if (tb[RTA_DST]) {
 307                 if (r->rtm_dst_len != host_len) {
 308                         fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
 309                                                          RTA_PAYLOAD(tb[RTA_DST]),
 310                                                          RTA_DATA(tb[RTA_DST]),
 311                                                          abuf, sizeof(abuf)),
 312                                 r->rtm_dst_len
 313                                 );
 314                 } else {
 315                         fprintf(fp, "%s ", format_host(r->rtm_family,
 316                                                        RTA_PAYLOAD(tb[RTA_DST]),
 317                                                        RTA_DATA(tb[RTA_DST]),
 318                                                        abuf, sizeof(abuf))
 319                                 );
 320                 }
 321         } else if (r->rtm_dst_len) {
 322                 fprintf(fp, "0/%d ", r->rtm_dst_len);
 323         } else {
 324                 fprintf(fp, "default ");
 325         }
 326         if (tb[RTA_SRC]) {
 327                 if (r->rtm_src_len != host_len) {
 328                         fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
 329                                                          RTA_PAYLOAD(tb[RTA_SRC]),
 330                                                          RTA_DATA(tb[RTA_SRC]),
 331                                                          abuf, sizeof(abuf)),
 332                                 r->rtm_src_len
 333                                 );
 334                 } else {
 335                         fprintf(fp, "from %s ", format_host(r->rtm_family,
 336                                                        RTA_PAYLOAD(tb[RTA_SRC]),
 337                                                        RTA_DATA(tb[RTA_SRC]),
 338                                                        abuf, sizeof(abuf))
 339                                 );
 340                 }
 341         } else if (r->rtm_src_len) {
 342                 fprintf(fp, "from 0/%u ", r->rtm_src_len);
 343         }
 344         if (r->rtm_tos && filter.tosmask != -1) {
 345                 SPRINT_BUF(b1);
 346                 fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 347         }
 348
 349         if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
 350                 fprintf(fp, "via %s ",
 351                         format_host(r->rtm_family,
 352                                     RTA_PAYLOAD(tb[RTA_GATEWAY]),
 353                                     RTA_DATA(tb[RTA_GATEWAY]),
 354                                     abuf, sizeof(abuf)));
 355         }
 356         if (tb[RTA_OIF] && filter.oifmask != -1)
 357                 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 358
 359         if (!(r->rtm_flags&RTM_F_CLONED)) {
 360                 if (table != RT_TABLE_MAIN && !filter.tb)
 361                         fprintf(fp, " table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
 362                 if (r->rtm_protocol != RTPROT_BOOT && filter.protocolmask != -1)
 363                         fprintf(fp, " proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
 364                 if (r->rtm_scope != RT_SCOPE_UNIVERSE && filter.scopemask != -1)
 365                         fprintf(fp, " scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
 366         }
 367         if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
 368                 /* Do not use format_host(). It is our local addr
 369                    and symbolic name will not be useful.
 370                  */
 371                 fprintf(fp, " src %s ",
 372                         rt_addr_n2a(r->rtm_family,
 373                                     RTA_PAYLOAD(tb[RTA_PREFSRC]),
 374                                     RTA_DATA(tb[RTA_PREFSRC]),
 375                                     abuf, sizeof(abuf)));
 376         }
 377         if (tb[RTA_PRIORITY])
 378                 fprintf(fp, " metric %d ", *(__u32*)RTA_DATA(tb[RTA_PRIORITY]));
 379         if (r->rtm_flags & RTNH_F_DEAD)
 380                 fprintf(fp, "dead ");
 381         if (r->rtm_flags & RTNH_F_ONLINK)
 382                 fprintf(fp, "onlink ");
 383         if (r->rtm_flags & RTNH_F_PERVASIVE)
 384                 fprintf(fp, "pervasive ");
 385         if (r->rtm_flags & RTM_F_NOTIFY)
 386                 fprintf(fp, "notify ");
 387
 388         if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
 389                 __u32 to = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
 390                 __u32 from = to>>16;
 391                 to &= 0xFFFF;
 392                 fprintf(fp, "realm%s ", from ? "s" : "");
 393                 if (from) {
 394                         fprintf(fp, "%s/",
 395                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 396                 }
 397                 fprintf(fp, "%s ",
 398                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 399         }
 400         if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
 401                 __u32 flags = r->rtm_flags&~0xFFFF;
 402                 int first = 1;
 403
 404                 fprintf(fp, "%s    cache ", _SL_);
 405
 406 #define PRTFL(fl,flname) if (flags&RTCF_##fl) { \
 407   flags &= ~RTCF_##fl; \
 408   fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
 409   first = 0; }
 410                 PRTFL(LOCAL, "local");
 411                 PRTFL(REJECT, "reject");
 412                 PRTFL(MULTICAST, "mc");
 413                 PRTFL(BROADCAST, "brd");
 414                 PRTFL(DNAT, "dst-nat");
 415                 PRTFL(SNAT, "src-nat");
 416                 PRTFL(MASQ, "masq");
 417                 PRTFL(DIRECTDST, "dst-direct");
 418                 PRTFL(DIRECTSRC, "src-direct");
 419                 PRTFL(REDIRECTED, "redirected");
 420                 PRTFL(DOREDIRECT, "redirect");
 421                 PRTFL(FAST, "fastroute");
 422                 PRTFL(NOTIFY, "notify");
 423                 PRTFL(TPROXY, "proxy");
 424
 425                 if (flags)
 426                         fprintf(fp, "%s%x> ", first ? "<" : "", flags);
 427                 if (tb[RTA_CACHEINFO]) {
 428                         struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
 429                         if (!hz)
 430                                 hz = get_user_hz();
 431                         if (ci->rta_expires != 0)
 432                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 433                         if (ci->rta_error != 0)
 434                                 fprintf(fp, " error %d", ci->rta_error);
 435                         if (show_stats) {
 436                                 if (ci->rta_clntref)
 437                                         fprintf(fp, " users %d", ci->rta_clntref);
 438                                 if (ci->rta_used != 0)
 439                                         fprintf(fp, " used %d", ci->rta_used);
 440                                 if (ci->rta_lastuse != 0)
 441                                         fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
 442                         }
 443 #ifdef RTNETLINK_HAVE_PEERINFO
 444                         if (ci->rta_id)
 445                                 fprintf(fp, " ipid 0x%04x", ci->rta_id);
 446                         if (ci->rta_ts || ci->rta_tsage)
 447                                 fprintf(fp, " ts 0x%x tsage %dsec", ci->rta_ts, ci->rta_tsage);
 448 #endif
 449                 }
 450         } else if (r->rtm_family == AF_INET6) {
 451                 struct rta_cacheinfo *ci = NULL;
 452                 if (tb[RTA_CACHEINFO])
 453                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 454                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 455                         if (!hz)
 456                                 hz = get_user_hz();
 457                         if (r->rtm_flags & RTM_F_CLONED)
 458                                 fprintf(fp, "%s    cache ", _SL_);
 459                         if (ci->rta_expires)
 460                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 461                         if (ci->rta_error != 0)
 462                                 fprintf(fp, " error %d", ci->rta_error);
 463                         if (show_stats) {
 464                                 if (ci->rta_clntref)
 465                                         fprintf(fp, " users %d", ci->rta_clntref);
 466                                 if (ci->rta_used != 0)
 467                                         fprintf(fp, " used %d", ci->rta_used);
 468                                 if (ci->rta_lastuse != 0)
 469                                         fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
 470                         }
 471                 } else if (ci) {
 472                         if (ci->rta_error != 0)
 473                                 fprintf(fp, " error %d", ci->rta_error);
 474                 }
 475         }
 476         if (tb[RTA_METRICS]) {
 477                 int i;
 478                 unsigned mxlock = 0;
 479                 struct rtattr *mxrta[RTAX_MAX+1];
 480
 481                 parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
 482                             RTA_PAYLOAD(tb[RTA_METRICS]));
 483                 if (mxrta[RTAX_LOCK])
 484                         mxlock = *(unsigned*)RTA_DATA(mxrta[RTAX_LOCK]);
 485
 486                 for (i=2; i<= RTAX_MAX; i++) {
 487                         unsigned val;
 488
 489                         if (mxrta[i] == NULL)
 490                                 continue;
 491                         if (!hz)
 492                                 hz = get_hz();
 493
 494                         if (i < sizeof(mx_names)/sizeof(char*) && mx_names[i])
 495                                 fprintf(fp, " %s", mx_names[i]);
 496                         else
 497                                 fprintf(fp, " metric %d", i);
 498                         if (mxlock & (1<<i))
 499                                 fprintf(fp, " lock");
 500
 501                         val = *(unsigned*)RTA_DATA(mxrta[i]);
 502                         switch (i) {
 503                         case RTAX_HOPLIMIT:
 504                                 if ((long)val == -1)
 505                                         val = 0;
 506                                 /* fall through */
 507                         default:
 508                                 fprintf(fp, " %u", val);
 509                                 break;
 510
 511                         case RTAX_RTT:
 512                         case RTAX_RTTVAR:
 513                         case RTAX_RTO_MIN:
 514                                 val *= 1000;
 515                                 if (i == RTAX_RTT)
 516                                         val /= 8;
 517                                 else if (i == RTAX_RTTVAR)
 518                                         val /= 4;
 519
 520                                 if (val >= hz)
 521                                         fprintf(fp, " %llums",
 522                                                 (unsigned long long) val / hz);
 523                                 else
 524                                         fprintf(fp, " %.2fms",
 525                                                 (double)val / hz);
 526                         }
 527                 }
 528         }
 529         if (tb[RTA_IIF] && filter.iifmask != -1) {
 530                 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 531         }
 532         if (tb[RTA_MULTIPATH]) {
 533                 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
 534                 int first = 0;
 535
 536                 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
 537
 538                 for (;;) {
 539                         if (len < sizeof(*nh))
 540                                 break;
 541                         if (nh->rtnh_len > len)
 542                                 break;
 543                         if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
 544                                 if (first)
 545                                         fprintf(fp, " Oifs:");
 546                                 else
 547                                         fprintf(fp, " ");
 548                         } else
 549                                 fprintf(fp, "%s\tnexthop", _SL_);
 550                         if (nh->rtnh_len > sizeof(*nh)) {
 551                                 parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
 552                                 if (tb[RTA_GATEWAY]) {
 553                                         fprintf(fp, " via %s ",
 554                                                 format_host(r->rtm_family,
 555                                                             RTA_PAYLOAD(tb[RTA_GATEWAY]),
 556                                                             RTA_DATA(tb[RTA_GATEWAY]),
 557                                                             abuf, sizeof(abuf)));
 558                                 }
 559                                 if (tb[RTA_FLOW]) {
 560                                         __u32 to = *(__u32*)RTA_DATA(tb[RTA_FLOW]);
 561                                         __u32 from = to>>16;
 562                                         to &= 0xFFFF;
 563                                         fprintf(fp, " realm%s ", from ? "s" : "");
 564                                         if (from) {
 565                                                 fprintf(fp, "%s/",
 566                                                         rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 567                                         }
 568                                         fprintf(fp, "%s",
 569                                                 rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 570                                 }
 571                         }
 572                         if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
 573                                 fprintf(fp, " %s", ll_index_to_name(nh->rtnh_ifindex));
 574                                 if (nh->rtnh_hops != 1)
 575                                         fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
 576                         } else {
 577                                 fprintf(fp, " dev %s", ll_index_to_name(nh->rtnh_ifindex));
 578                                 fprintf(fp, " weight %d", nh->rtnh_hops+1);
 579                         }
 580                         if (nh->rtnh_flags & RTNH_F_DEAD)
 581                                 fprintf(fp, " dead");
 582                         if (nh->rtnh_flags & RTNH_F_ONLINK)
 583                                 fprintf(fp, " onlink");
 584                         if (nh->rtnh_flags & RTNH_F_PERVASIVE)
 585                                 fprintf(fp, " pervasive");
 586                         len -= NLMSG_ALIGN(nh->rtnh_len);
 587                         nh = RTNH_NEXT(nh);
 588                 }
 589         }
 590         fprintf(fp, "\n");
 591         fflush(fp);
 592         return 0;
 593 }
 594
 595
 596 int parse_one_nh(struct rtattr *rta, struct rtnexthop *rtnh, int *argcp, char ***argvp)
 597 {
 598         int argc = *argcp;
 599         char **argv = *argvp;
 600
 601         while (++argv, --argc > 0) {
 602                 if (strcmp(*argv, "via") == 0) {
 603                         NEXT_ARG();
 604                         rta_addattr32(rta, 4096, RTA_GATEWAY, get_addr32(*argv));
 605                         rtnh->rtnh_len += sizeof(struct rtattr) + 4;
 606                 } else if (strcmp(*argv, "dev") == 0) {
 607                         NEXT_ARG();
 608                         if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
 609                                 fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
 610                                 exit(1);
 611                         }
 612                 } else if (strcmp(*argv, "weight") == 0) {
 613                         unsigned w;
 614                         NEXT_ARG();
 615                         if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
 616                                 invarg("\"weight\" is invalid\n", *argv);
 617                         rtnh->rtnh_hops = w - 1;
 618                 } else if (strcmp(*argv, "onlink") == 0) {
 619                         rtnh->rtnh_flags |= RTNH_F_ONLINK;
 620                 } else if (matches(*argv, "realms") == 0) {
 621                         __u32 realm;
 622                         NEXT_ARG();
 623                         if (get_rt_realms(&realm, *argv))
 624                                 invarg("\"realm\" value is invalid\n", *argv);
 625                         rta_addattr32(rta, 4096, RTA_FLOW, realm);
 626                         rtnh->rtnh_len += sizeof(struct rtattr) + 4;
 627                 } else
 628                         break;
 629         }
 630         *argcp = argc;
 631         *argvp = argv;
 632         return 0;
 633 }
 634
 635 int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r, int argc, char **argv)
 636 {
 637         char buf[1024];
 638         struct rtattr *rta = (void*)buf;
 639         struct rtnexthop *rtnh;
 640
 641         rta->rta_type = RTA_MULTIPATH;
 642         rta->rta_len = RTA_LENGTH(0);
 643         rtnh = RTA_DATA(rta);
 644
 645         while (argc > 0) {
 646                 if (strcmp(*argv, "nexthop") != 0) {
 647                         fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
 648                         exit(-1);
 649                 }
 650                 if (argc <= 1) {
 651                         fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
 652                         exit(-1);
 653                 }
 654                 memset(rtnh, 0, sizeof(*rtnh));
 655                 rtnh->rtnh_len = sizeof(*rtnh);
 656                 rta->rta_len += rtnh->rtnh_len;
 657                 parse_one_nh(rta, rtnh, &argc, &argv);
 658                 rtnh = RTNH_NEXT(rtnh);
 659         }
 660
 661         if (rta->rta_len > RTA_LENGTH(0))
 662                 addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
 663         return 0;
 664 }
 665
 666
 667 int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
 668 {
 669         struct {
 670                 struct nlmsghdr         n;
 671                 struct rtmsg            r;
 672                 char                    buf[1024];
 673         } req;
 674         char  mxbuf[256];
 675         struct rtattr * mxrta = (void*)mxbuf;
 676         unsigned mxlock = 0;
 677         char  *d = NULL;
 678         int gw_ok = 0;
 679         int dst_ok = 0;
 680         int nhs_ok = 0;
 681         int scope_ok = 0;
 682         int table_ok = 0;
 683         int proto_ok = 0;
 684         int type_ok = 0;
 685         int raw = 0;
 686
 687         memset(&req, 0, sizeof(req));
 688
 689         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 690         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 691         req.n.nlmsg_type = cmd;
 692         req.r.rtm_family = preferred_family;
 693         req.r.rtm_table = RT_TABLE_MAIN;
 694         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 695
 696         if (cmd != RTM_DELROUTE) {
 697                 req.r.rtm_protocol = RTPROT_BOOT;
 698                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 699                 req.r.rtm_type = RTN_UNICAST;
 700         }
 701
 702         mxrta->rta_type = RTA_METRICS;
 703         mxrta->rta_len = RTA_LENGTH(0);
 704
 705         while (argc > 0) {
 706                 if (strcmp(*argv, "src") == 0) {
 707                         inet_prefix addr;
 708                         NEXT_ARG();
 709                         get_addr(&addr, *argv, req.r.rtm_family);
 710                         if (req.r.rtm_family == AF_UNSPEC)
 711                                 req.r.rtm_family = addr.family;
 712                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 713                 } else if (strcmp(*argv, "via") == 0) {
 714                         inet_prefix addr;
 715                         gw_ok = 1;
 716                         NEXT_ARG();
 717                         get_addr(&addr, *argv, req.r.rtm_family);
 718                         if (req.r.rtm_family == AF_UNSPEC)
 719                                 req.r.rtm_family = addr.family;
 720                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 721                 } else if (strcmp(*argv, "from") == 0) {
 722                         inet_prefix addr;
 723                         NEXT_ARG();
 724                         get_prefix(&addr, *argv, req.r.rtm_family);
 725                         if (req.r.rtm_family == AF_UNSPEC)
 726                                 req.r.rtm_family = addr.family;
 727                         if (addr.bytelen)
 728                                 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 729                         req.r.rtm_src_len = addr.bitlen;
 730                 } else if (strcmp(*argv, "tos") == 0 ||
 731                            matches(*argv, "dsfield") == 0) {
 732                         __u32 tos;
 733                         NEXT_ARG();
 734                         if (rtnl_dsfield_a2n(&tos, *argv))
 735                                 invarg("\"tos\" value is invalid\n", *argv);
 736                         req.r.rtm_tos = tos;
 737                 } else if (matches(*argv, "metric") == 0 ||
 738                            matches(*argv, "priority") == 0 ||
 739                            matches(*argv, "preference") == 0) {
 740                         __u32 metric;
 741                         NEXT_ARG();
 742                         if (get_u32(&metric, *argv, 0))
 743                                 invarg("\"metric\" value is invalid\n", *argv);
 744                         addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
 745                 } else if (strcmp(*argv, "scope") == 0) {
 746                         __u32 scope = 0;
 747                         NEXT_ARG();
 748                         if (rtnl_rtscope_a2n(&scope, *argv))
 749                                 invarg("invalid \"scope\" value\n", *argv);
 750                         req.r.rtm_scope = scope;
 751                         scope_ok = 1;
 752                 } else if (strcmp(*argv, "mtu") == 0) {
 753                         unsigned mtu;
 754                         NEXT_ARG();
 755                         if (strcmp(*argv, "lock") == 0) {
 756                                 mxlock |= (1<<RTAX_MTU);
 757                                 NEXT_ARG();
 758                         }
 759                         if (get_unsigned(&mtu, *argv, 0))
 760                                 invarg("\"mtu\" value is invalid\n", *argv);
 761                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 762 #ifdef RTAX_HOPLIMIT
 763                 } else if (strcmp(*argv, "hoplimit") == 0) {
 764                         unsigned hoplimit;
 765                         NEXT_ARG();
 766                         if (strcmp(*argv, "lock") == 0) {
 767                                 mxlock |= (1<<RTAX_HOPLIMIT);
 768                                 NEXT_ARG();
 769                         }
 770                         if (get_unsigned(&hoplimit, *argv, 0))
 771                                 invarg("\"hoplimit\" value is invalid\n", *argv);
 772                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
 773 #endif
 774 #ifdef RTAX_ADVMSS
 775                 } else if (strcmp(*argv, "advmss") == 0) {
 776                         unsigned mss;
 777                         NEXT_ARG();
 778                         if (strcmp(*argv, "lock") == 0) {
 779                                 mxlock |= (1<<RTAX_ADVMSS);
 780                                 NEXT_ARG();
 781                         }
 782                         if (get_unsigned(&mss, *argv, 0))
 783                                 invarg("\"mss\" value is invalid\n", *argv);
 784                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
 785 #endif
 786 #ifdef RTAX_REORDERING
 787                 } else if (matches(*argv, "reordering") == 0) {
 788                         unsigned reord;
 789                         NEXT_ARG();
 790                         if (strcmp(*argv, "lock") == 0) {
 791                                 mxlock |= (1<<RTAX_REORDERING);
 792                                 NEXT_ARG();
 793                         }
 794                         if (get_unsigned(&reord, *argv, 0))
 795                                 invarg("\"reordering\" value is invalid\n", *argv);
 796                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
 797 #endif
 798                 } else if (strcmp(*argv, "rtt") == 0) {
 799                         unsigned rtt;
 800                         NEXT_ARG();
 801                         if (strcmp(*argv, "lock") == 0) {
 802                                 mxlock |= (1<<RTAX_RTT);
 803                                 NEXT_ARG();
 804                         }
 805                         if (get_jiffies(&rtt, *argv, 0, &raw))
 806                                 invarg("\"rtt\" value is invalid\n", *argv);
 807                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
 808                                 (raw) ? rtt : rtt * 8);
 809                 } else if (strcmp(*argv, "rto_min") == 0) {
 810                         unsigned rto_min;
 811                         NEXT_ARG();
 812                         mxlock |= (1<<RTAX_RTO_MIN);
 813                         if (get_jiffies(&rto_min, *argv, 0, &raw))
 814                                 invarg("\"rto_min\" value is invalid\n",
 815                                        *argv);
 816                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
 817                                       rto_min);
 818                 } else if (matches(*argv, "window") == 0) {
 819                         unsigned win;
 820                         NEXT_ARG();
 821                         if (strcmp(*argv, "lock") == 0) {
 822                                 mxlock |= (1<<RTAX_WINDOW);
 823                                 NEXT_ARG();
 824                         }
 825                         if (get_unsigned(&win, *argv, 0))
 826                                 invarg("\"window\" value is invalid\n", *argv);
 827                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
 828                 } else if (matches(*argv, "cwnd") == 0) {
 829                         unsigned win;
 830                         NEXT_ARG();
 831                         if (strcmp(*argv, "lock") == 0) {
 832                                 mxlock |= (1<<RTAX_CWND);
 833                                 NEXT_ARG();
 834                         }
 835                         if (get_unsigned(&win, *argv, 0))
 836                                 invarg("\"cwnd\" value is invalid\n", *argv);
 837                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
 838                 } else if (matches(*argv, "initcwnd") == 0) {
 839                         unsigned win;
 840                         NEXT_ARG();
 841                         if (strcmp(*argv, "lock") == 0) {
 842                                 mxlock |= (1<<RTAX_INITCWND);
 843                                 NEXT_ARG();
 844                         }
 845                         if (get_unsigned(&win, *argv, 0))
 846                                 invarg("\"initcwnd\" value is invalid\n", *argv);
 847                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
 848                 } else if (matches(*argv, "initrwnd") == 0) {
 849                         unsigned win;
 850                         NEXT_ARG();
 851                         if (strcmp(*argv, "lock") == 0) {
 852                                 mxlock |= (1<<RTAX_INITRWND);
 853                                 NEXT_ARG();
 854                         }
 855                         if (get_unsigned(&win, *argv, 0))
 856                                 invarg("\"initrwnd\" value is invalid\n", *argv);
 857                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
 858                 } else if (matches(*argv, "rttvar") == 0) {
 859                         unsigned win;
 860                         NEXT_ARG();
 861                         if (strcmp(*argv, "lock") == 0) {
 862                                 mxlock |= (1<<RTAX_RTTVAR);
 863                                 NEXT_ARG();
 864                         }
 865                         if (get_jiffies(&win, *argv, 0, &raw))
 866                                 invarg("\"rttvar\" value is invalid\n", *argv);
 867                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
 868                                 (raw) ? win : win * 4);
 869                 } else if (matches(*argv, "ssthresh") == 0) {
 870                         unsigned win;
 871                         NEXT_ARG();
 872                         if (strcmp(*argv, "lock") == 0) {
 873                                 mxlock |= (1<<RTAX_SSTHRESH);
 874                                 NEXT_ARG();
 875                         }
 876                         if (get_unsigned(&win, *argv, 0))
 877                                 invarg("\"ssthresh\" value is invalid\n", *argv);
 878                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
 879                 } else if (matches(*argv, "realms") == 0) {
 880                         __u32 realm;
 881                         NEXT_ARG();
 882                         if (get_rt_realms(&realm, *argv))
 883                                 invarg("\"realm\" value is invalid\n", *argv);
 884                         addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
 885                 } else if (strcmp(*argv, "onlink") == 0) {
 886                         req.r.rtm_flags |= RTNH_F_ONLINK;
 887                 } else if (strcmp(*argv, "nexthop") == 0) {
 888                         nhs_ok = 1;
 889                         break;
 890                 } else if (matches(*argv, "protocol") == 0) {
 891                         __u32 prot;
 892                         NEXT_ARG();
 893                         if (rtnl_rtprot_a2n(&prot, *argv))
 894                                 invarg("\"protocol\" value is invalid\n", *argv);
 895                         req.r.rtm_protocol = prot;
 896                         proto_ok =1;
 897                 } else if (matches(*argv, "table") == 0) {
 898                         __u32 tid;
 899                         NEXT_ARG();
 900                         if (rtnl_rttable_a2n(&tid, *argv))
 901                                 invarg("\"table\" value is invalid\n", *argv);
 902                         if (tid < 256)
 903                                 req.r.rtm_table = tid;
 904                         else {
 905                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 906                                 addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
 907                         }
 908                         table_ok = 1;
 909                 } else if (strcmp(*argv, "dev") == 0 ||
 910                            strcmp(*argv, "oif") == 0) {
 911                         NEXT_ARG();
 912                         d = *argv;
 913                 } else {
 914                         int type;
 915                         inet_prefix dst;
 916
 917                         if (strcmp(*argv, "to") == 0) {
 918                                 NEXT_ARG();
 919                         }
 920                         if ((**argv < '0' || **argv > '9') &&
 921                             rtnl_rtntype_a2n(&type, *argv) == 0) {
 922                                 NEXT_ARG();
 923                                 req.r.rtm_type = type;
 924                                 type_ok = 1;
 925                         }
 926
 927                         if (matches(*argv, "help") == 0)
 928                                 usage();
 929                         if (dst_ok)
 930                                 duparg2("to", *argv);
 931                         get_prefix(&dst, *argv, req.r.rtm_family);
 932                         if (req.r.rtm_family == AF_UNSPEC)
 933                                 req.r.rtm_family = dst.family;
 934                         req.r.rtm_dst_len = dst.bitlen;
 935                         dst_ok = 1;
 936                         if (dst.bytelen)
 937                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 938                 }
 939                 argc--; argv++;
 940         }
 941
 942         if (d || nhs_ok)  {
 943                 int idx;
 944
 945                 ll_init_map(&rth);
 946
 947                 if (d) {
 948                         if ((idx = ll_name_to_index(d)) == 0) {
 949                                 fprintf(stderr, "Cannot find device \"%s\"\n", d);
 950                                 return -1;
 951                         }
 952                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 953                 }
 954         }
 955
 956         if (mxrta->rta_len > RTA_LENGTH(0)) {
 957                 if (mxlock)
 958                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 959                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 960         }
 961
 962         if (nhs_ok)
 963                 parse_nexthops(&req.n, &req.r, argc, argv);
 964
 965         if (!table_ok) {
 966                 if (req.r.rtm_type == RTN_LOCAL ||
 967                     req.r.rtm_type == RTN_BROADCAST ||
 968                     req.r.rtm_type == RTN_NAT ||
 969                     req.r.rtm_type == RTN_ANYCAST)
 970                         req.r.rtm_table = RT_TABLE_LOCAL;
 971         }
 972         if (!scope_ok) {
 973                 if (req.r.rtm_type == RTN_LOCAL ||
 974                     req.r.rtm_type == RTN_NAT)
 975                         req.r.rtm_scope = RT_SCOPE_HOST;
 976                 else if (req.r.rtm_type == RTN_BROADCAST ||
 977                          req.r.rtm_type == RTN_MULTICAST ||
 978                          req.r.rtm_type == RTN_ANYCAST)
 979                         req.r.rtm_scope = RT_SCOPE_LINK;
 980                 else if (req.r.rtm_type == RTN_UNICAST ||
 981                          req.r.rtm_type == RTN_UNSPEC) {
 982                         if (cmd == RTM_DELROUTE)
 983                                 req.r.rtm_scope = RT_SCOPE_NOWHERE;
 984                         else if (!gw_ok && !nhs_ok)
 985                                 req.r.rtm_scope = RT_SCOPE_LINK;
 986                 }
 987         }
 988
 989         if (req.r.rtm_family == AF_UNSPEC)
 990                 req.r.rtm_family = AF_INET;
 991
 992         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 993                 exit(2);
 994
 995         return 0;
 996 }
 997
 998 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
 999 {
1000         struct {
1001                 struct nlmsghdr nlh;
1002                 struct rtmsg rtm;
1003         } req;
1004         struct sockaddr_nl nladdr;
1005
1006         memset(&nladdr, 0, sizeof(nladdr));
1007         memset(&req, 0, sizeof(req));
1008         nladdr.nl_family = AF_NETLINK;
1009
1010         req.nlh.nlmsg_len = sizeof(req);
1011         req.nlh.nlmsg_type = RTM_GETROUTE;
1012         req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
1013         req.nlh.nlmsg_pid = 0;
1014         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
1015         req.rtm.rtm_family = family;
1016         req.rtm.rtm_flags |= RTM_F_CLONED;
1017
1018         return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
1019 }
1020
1021 static int iproute_flush_cache(void)
1022 {
1023 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1024
1025         int len;
1026         int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
1027         char *buffer = "-1";
1028
1029         if (flush_fd < 0) {
1030                 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
1031                 return -1;
1032         }
1033
1034         len = strlen (buffer);
1035
1036         if ((write (flush_fd, (void *)buffer, len)) < len) {
1037                 fprintf (stderr, "Cannot flush routing cache\n");
1038                 return -1;
1039         }
1040         close(flush_fd);
1041         return 0;
1042 }
1043
1044
1045 static int iproute_list_or_flush(int argc, char **argv, int flush)
1046 {
1047         int do_ipv6 = preferred_family;
1048         char *id = NULL;
1049         char *od = NULL;
1050
1051         iproute_reset_filter();
1052         filter.tb = RT_TABLE_MAIN;
1053
1054         if (flush && argc <= 0) {
1055                 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1056                 return -1;
1057         }
1058
1059         while (argc > 0) {
1060                 if (matches(*argv, "table") == 0) {
1061                         __u32 tid;
1062                         NEXT_ARG();
1063                         if (rtnl_rttable_a2n(&tid, *argv)) {
1064                                 if (strcmp(*argv, "all") == 0) {
1065                                         filter.tb = 0;
1066                                 } else if (strcmp(*argv, "cache") == 0) {
1067                                         filter.cloned = 1;
1068                                 } else if (strcmp(*argv, "help") == 0) {
1069                                         usage();
1070                                 } else {
1071                                         invarg("table id value is invalid\n", *argv);
1072                                 }
1073                         } else
1074                                 filter.tb = tid;
1075                 } else if (matches(*argv, "cached") == 0 ||
1076                            matches(*argv, "cloned") == 0) {
1077                         filter.cloned = 1;
1078                 } else if (strcmp(*argv, "tos") == 0 ||
1079                            matches(*argv, "dsfield") == 0) {
1080                         __u32 tos;
1081                         NEXT_ARG();
1082                         if (rtnl_dsfield_a2n(&tos, *argv))
1083                                 invarg("TOS value is invalid\n", *argv);
1084                         filter.tos = tos;
1085                         filter.tosmask = -1;
1086                 } else if (matches(*argv, "protocol") == 0) {
1087                         __u32 prot = 0;
1088                         NEXT_ARG();
1089                         filter.protocolmask = -1;
1090                         if (rtnl_rtprot_a2n(&prot, *argv)) {
1091                                 if (strcmp(*argv, "all") != 0)
1092                                         invarg("invalid \"protocol\"\n", *argv);
1093                                 prot = 0;
1094                                 filter.protocolmask = 0;
1095                         }
1096                         filter.protocol = prot;
1097                 } else if (matches(*argv, "scope") == 0) {
1098                         __u32 scope = 0;
1099                         NEXT_ARG();
1100                         filter.scopemask = -1;
1101                         if (rtnl_rtscope_a2n(&scope, *argv)) {
1102                                 if (strcmp(*argv, "all") != 0)
1103                                         invarg("invalid \"scope\"\n", *argv);
1104                                 scope = RT_SCOPE_NOWHERE;
1105                                 filter.scopemask = 0;
1106                         }
1107                         filter.scope = scope;
1108                 } else if (matches(*argv, "type") == 0) {
1109                         int type;
1110                         NEXT_ARG();
1111                         filter.typemask = -1;
1112                         if (rtnl_rtntype_a2n(&type, *argv))
1113                                 invarg("node type value is invalid\n", *argv);
1114                         filter.type = type;
1115                 } else if (strcmp(*argv, "dev") == 0 ||
1116                            strcmp(*argv, "oif") == 0) {
1117                         NEXT_ARG();
1118                         od = *argv;
1119                 } else if (strcmp(*argv, "iif") == 0) {
1120                         NEXT_ARG();
1121                         id = *argv;
1122                 } else if (strcmp(*argv, "via") == 0) {
1123                         NEXT_ARG();
1124                         get_prefix(&filter.rvia, *argv, do_ipv6);
1125                 } else if (strcmp(*argv, "src") == 0) {
1126                         NEXT_ARG();
1127                         get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1128                 } else if (matches(*argv, "realms") == 0) {
1129                         __u32 realm;
1130                         NEXT_ARG();
1131                         if (get_rt_realms(&realm, *argv))
1132                                 invarg("invalid realms\n", *argv);
1133                         filter.realm = realm;
1134                         filter.realmmask = ~0U;
1135                         if ((filter.realm&0xFFFF) == 0 &&
1136                             (*argv)[strlen(*argv) - 1] == '/')
1137                                 filter.realmmask &= ~0xFFFF;
1138                         if ((filter.realm&0xFFFF0000U) == 0 &&
1139                             (strchr(*argv, '/') == NULL ||
1140                              (*argv)[0] == '/'))
1141                                 filter.realmmask &= ~0xFFFF0000U;
1142                 } else if (matches(*argv, "from") == 0) {
1143                         NEXT_ARG();
1144                         if (matches(*argv, "root") == 0) {
1145                                 NEXT_ARG();
1146                                 get_prefix(&filter.rsrc, *argv, do_ipv6);
1147                         } else if (matches(*argv, "match") == 0) {
1148                                 NEXT_ARG();
1149                                 get_prefix(&filter.msrc, *argv, do_ipv6);
1150                         } else {
1151                                 if (matches(*argv, "exact") == 0) {
1152                                         NEXT_ARG();
1153                                 }
1154                                 get_prefix(&filter.msrc, *argv, do_ipv6);
1155                                 filter.rsrc = filter.msrc;
1156                         }
1157                 } else {
1158                         if (matches(*argv, "to") == 0) {
1159                                 NEXT_ARG();
1160                         }
1161                         if (matches(*argv, "root") == 0) {
1162                                 NEXT_ARG();
1163                                 get_prefix(&filter.rdst, *argv, do_ipv6);
1164                         } else if (matches(*argv, "match") == 0) {
1165                                 NEXT_ARG();
1166                                 get_prefix(&filter.mdst, *argv, do_ipv6);
1167                         } else {
1168                                 if (matches(*argv, "exact") == 0) {
1169                                         NEXT_ARG();
1170                                 }
1171                                 get_prefix(&filter.mdst, *argv, do_ipv6);
1172                                 filter.rdst = filter.mdst;
1173                         }
1174                 }
1175                 argc--; argv++;
1176         }
1177
1178         if (do_ipv6 == AF_UNSPEC && filter.tb)
1179                 do_ipv6 = AF_INET;
1180
1181         ll_init_map(&rth);
1182
1183         if (id || od)  {
1184                 int idx;
1185
1186                 if (id) {
1187                         if ((idx = ll_name_to_index(id)) == 0) {
1188                                 fprintf(stderr, "Cannot find device \"%s\"\n", id);
1189                                 return -1;
1190                         }
1191                         filter.iif = idx;
1192                         filter.iifmask = -1;
1193                 }
1194                 if (od) {
1195                         if ((idx = ll_name_to_index(od)) == 0) {
1196                                 fprintf(stderr, "Cannot find device \"%s\"\n", od);
1197                                 return -1;
1198                         }
1199                         filter.oif = idx;
1200                         filter.oifmask = -1;
1201                 }
1202         }
1203
1204         if (flush) {
1205                 int round = 0;
1206                 char flushb[4096-512];
1207                 time_t start = time(0);
1208
1209                 if (filter.cloned) {
1210                         if (do_ipv6 != AF_INET6) {
1211                                 iproute_flush_cache();
1212                                 if (show_stats)
1213                                         printf("*** IPv4 routing cache is flushed.\n");
1214                         }
1215                         if (do_ipv6 == AF_INET)
1216                                 return 0;
1217                 }
1218
1219                 filter.flushb = flushb;
1220                 filter.flushp = 0;
1221                 filter.flushe = sizeof(flushb);
1222
1223                 for (;;) {
1224                         if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1225                                 perror("Cannot send dump request");
1226                                 exit(1);
1227                         }
1228                         filter.flushed = 0;
1229                         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
1230                                 fprintf(stderr, "Flush terminated\n");
1231                                 exit(1);
1232                         }
1233                         if (filter.flushed == 0) {
1234                                 if (show_stats) {
1235                                         if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1236                                                 printf("Nothing to flush.\n");
1237                                         else
1238                                                 printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
1239                                 }
1240                                 fflush(stdout);
1241                                 return 0;
1242                         }
1243                         round++;
1244                         if (flush_update() < 0)
1245                                 exit(1);
1246
1247                         if (time(0) - start > 30) {
1248                                 printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1249                                        time(0) - start, filter.flushed);
1250                                 exit(1);
1251                         }
1252
1253                         if (show_stats) {
1254                                 printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1255                                 fflush(stdout);
1256                         }
1257                 }
1258         }
1259
1260         if (!filter.cloned) {
1261                 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1262                         perror("Cannot send dump request");
1263                         exit(1);
1264                 }
1265         } else {
1266                 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1267                         perror("Cannot send dump request");
1268                         exit(1);
1269                 }
1270         }
1271
1272         if (rtnl_dump_filter(&rth, print_route, stdout, NULL, NULL) < 0) {
1273                 fprintf(stderr, "Dump terminated\n");
1274                 exit(1);
1275         }
1276
1277         exit(0);
1278 }
1279
1280
1281 int iproute_get(int argc, char **argv)
1282 {
1283         struct {
1284                 struct nlmsghdr         n;
1285                 struct rtmsg            r;
1286                 char                    buf[1024];
1287         } req;
1288         char  *idev = NULL;
1289         char  *odev = NULL;
1290         int connected = 0;
1291         int from_ok = 0;
1292
1293         memset(&req, 0, sizeof(req));
1294
1295         iproute_reset_filter();
1296
1297         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
1298         req.n.nlmsg_flags = NLM_F_REQUEST;
1299         req.n.nlmsg_type = RTM_GETROUTE;
1300         req.r.rtm_family = preferred_family;
1301         req.r.rtm_table = 0;
1302         req.r.rtm_protocol = 0;
1303         req.r.rtm_scope = 0;
1304         req.r.rtm_type = 0;
1305         req.r.rtm_src_len = 0;
1306         req.r.rtm_dst_len = 0;
1307         req.r.rtm_tos = 0;
1308
1309         while (argc > 0) {
1310                 if (strcmp(*argv, "tos") == 0 ||
1311                     matches(*argv, "dsfield") == 0) {
1312                         __u32 tos;
1313                         NEXT_ARG();
1314                         if (rtnl_dsfield_a2n(&tos, *argv))
1315                                 invarg("TOS value is invalid\n", *argv);
1316                         req.r.rtm_tos = tos;
1317                 } else if (matches(*argv, "from") == 0) {
1318                         inet_prefix addr;
1319                         NEXT_ARG();
1320                         if (matches(*argv, "help") == 0)
1321                                 usage();
1322                         from_ok = 1;
1323                         get_prefix(&addr, *argv, req.r.rtm_family);
1324                         if (req.r.rtm_family == AF_UNSPEC)
1325                                 req.r.rtm_family = addr.family;
1326                         if (addr.bytelen)
1327                                 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1328                         req.r.rtm_src_len = addr.bitlen;
1329                 } else if (matches(*argv, "iif") == 0) {
1330                         NEXT_ARG();
1331                         idev = *argv;
1332                 } else if (matches(*argv, "oif") == 0 ||
1333                            strcmp(*argv, "dev") == 0) {
1334                         NEXT_ARG();
1335                         odev = *argv;
1336                 } else if (matches(*argv, "notify") == 0) {
1337                         req.r.rtm_flags |= RTM_F_NOTIFY;
1338                 } else if (matches(*argv, "connected") == 0) {
1339                         connected = 1;
1340                 } else {
1341                         inet_prefix addr;
1342                         if (strcmp(*argv, "to") == 0) {
1343                                 NEXT_ARG();
1344                         }
1345                         if (matches(*argv, "help") == 0)
1346                                 usage();
1347                         get_prefix(&addr, *argv, req.r.rtm_family);
1348                         if (req.r.rtm_family == AF_UNSPEC)
1349                                 req.r.rtm_family = addr.family;
1350                         if (addr.bytelen)
1351                                 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1352                         req.r.rtm_dst_len = addr.bitlen;
1353                 }
1354                 argc--; argv++;
1355         }
1356
1357         if (req.r.rtm_dst_len == 0) {
1358                 fprintf(stderr, "need at least destination address\n");
1359                 exit(1);
1360         }
1361
1362         ll_init_map(&rth);
1363
1364         if (idev || odev)  {
1365                 int idx;
1366
1367                 if (idev) {
1368                         if ((idx = ll_name_to_index(idev)) == 0) {
1369                                 fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1370                                 return -1;
1371                         }
1372                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1373                 }
1374                 if (odev) {
1375                         if ((idx = ll_name_to_index(odev)) == 0) {
1376                                 fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1377                                 return -1;
1378                         }
1379                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1380                 }
1381         }
1382
1383         if (req.r.rtm_family == AF_UNSPEC)
1384                 req.r.rtm_family = AF_INET;
1385
1386         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0)
1387                 exit(2);
1388
1389         if (connected && !from_ok) {
1390                 struct rtmsg *r = NLMSG_DATA(&req.n);
1391                 int len = req.n.nlmsg_len;
1392                 struct rtattr * tb[RTA_MAX+1];
1393
1394                 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1395                         fprintf(stderr, "An error :-)\n");
1396                         exit(1);
1397                 }
1398
1399                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
1400                         fprintf(stderr, "Not a route?\n");
1401                         return -1;
1402                 }
1403                 len -= NLMSG_LENGTH(sizeof(*r));
1404                 if (len < 0) {
1405                         fprintf(stderr, "Wrong len %d\n", len);
1406                         return -1;
1407                 }
1408
1409                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1410
1411                 if (tb[RTA_PREFSRC]) {
1412                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1413                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1414                 } else if (!tb[RTA_SRC]) {
1415                         fprintf(stderr, "Failed to connect the route\n");
1416                         return -1;
1417                 }
1418                 if (!odev && tb[RTA_OIF])
1419                         tb[RTA_OIF]->rta_type = 0;
1420                 if (tb[RTA_GATEWAY])
1421                         tb[RTA_GATEWAY]->rta_type = 0;
1422                 if (!idev && tb[RTA_IIF])
1423                         tb[RTA_IIF]->rta_type = 0;
1424                 req.n.nlmsg_flags = NLM_F_REQUEST;
1425                 req.n.nlmsg_type = RTM_GETROUTE;
1426
1427                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n, NULL, NULL) < 0)
1428                         exit(2);
1429         }
1430
1431         if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1432                 fprintf(stderr, "An error :-)\n");
1433                 exit(1);
1434         }
1435
1436         exit(0);
1437 }
1438
1439 void iproute_reset_filter()
1440 {
1441         memset(&filter, 0, sizeof(filter));
1442         filter.mdst.bitlen = -1;
1443         filter.msrc.bitlen = -1;
1444 }
1445
1446 int do_iproute(int argc, char **argv)
1447 {
1448         if (argc < 1)
1449                 return iproute_list_or_flush(0, NULL, 0);
1450
1451         if (matches(*argv, "add") == 0)
1452                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1453                                       argc-1, argv+1);
1454         if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1455                 return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1456                                       argc-1, argv+1);
1457         if (matches(*argv, "replace") == 0)
1458                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1459                                       argc-1, argv+1);
1460         if (matches(*argv, "prepend") == 0)
1461                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1462                                       argc-1, argv+1);
1463         if (matches(*argv, "append") == 0)
1464                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
1465                                       argc-1, argv+1);
1466         if (matches(*argv, "test") == 0)
1467                 return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
1468                                       argc-1, argv+1);
1469         if (matches(*argv, "delete") == 0)
1470                 return iproute_modify(RTM_DELROUTE, 0,
1471                                       argc-1, argv+1);
1472         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
1473             || matches(*argv, "lst") == 0)
1474                 return iproute_list_or_flush(argc-1, argv+1, 0);
1475         if (matches(*argv, "get") == 0)
1476                 return iproute_get(argc-1, argv+1);
1477         if (matches(*argv, "flush") == 0)
1478                 return iproute_list_or_flush(argc-1, argv+1, 1);
1479         if (matches(*argv, "help") == 0)
1480                 usage();
1481         fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
1482         exit(-1);
1483 }
1484