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