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 #include <errno.h>
  27
  28 #include "rt_names.h"
  29 #include "utils.h"
  30 #include "ip_common.h"
  31
  32 #ifndef RTAX_RTTVAR
  33 #define RTAX_RTTVAR RTAX_HOPS
  34 #endif
  35
  36 enum list_action {
  37         IPROUTE_LIST,
  38         IPROUTE_FLUSH,
  39         IPROUTE_SAVE,
  40 };
  41 static const char *mx_names[RTAX_MAX+1] = {
  42         [RTAX_MTU]      = "mtu",
  43         [RTAX_WINDOW]   = "window",
  44         [RTAX_RTT]      = "rtt",
  45         [RTAX_RTTVAR]   = "rttvar",
  46         [RTAX_SSTHRESH] = "ssthresh",
  47         [RTAX_CWND]     = "cwnd",
  48         [RTAX_ADVMSS]   = "advmss",
  49         [RTAX_REORDERING]="reordering",
  50         [RTAX_HOPLIMIT] = "hoplimit",
  51         [RTAX_INITCWND] = "initcwnd",
  52         [RTAX_FEATURES] = "features",
  53         [RTAX_RTO_MIN]  = "rto_min",
  54         [RTAX_INITRWND] = "initrwnd",
  55 };
  56 static void usage(void) __attribute__((noreturn));
  57
  58 static void usage(void)
  59 {
  60         fprintf(stderr, "Usage: ip route { list | flush } SELECTOR\n");
  61         fprintf(stderr, "       ip route save SELECTOR\n");
  62         fprintf(stderr, "       ip route restore\n");
  63         fprintf(stderr, "       ip route get ADDRESS [ from ADDRESS iif STRING ]\n");
  64         fprintf(stderr, "                            [ oif STRING ]  [ tos TOS ]\n");
  65         fprintf(stderr, "                            [ mark NUMBER ]\n");
  66         fprintf(stderr, "       ip route { add | del | change | append | replace } ROUTE\n");
  67         fprintf(stderr, "SELECTOR := [ root PREFIX ] [ match PREFIX ] [ exact PREFIX ]\n");
  68         fprintf(stderr, "            [ table TABLE_ID ] [ proto RTPROTO ]\n");
  69         fprintf(stderr, "            [ type TYPE ] [ scope SCOPE ]\n");
  70         fprintf(stderr, "ROUTE := NODE_SPEC [ INFO_SPEC ]\n");
  71         fprintf(stderr, "NODE_SPEC := [ TYPE ] PREFIX [ tos TOS ]\n");
  72         fprintf(stderr, "             [ table TABLE_ID ] [ proto RTPROTO ]\n");
  73         fprintf(stderr, "             [ scope SCOPE ] [ metric METRIC ]\n");
  74         fprintf(stderr, "INFO_SPEC := NH OPTIONS FLAGS [ nexthop NH ]...\n");
  75         fprintf(stderr, "NH := [ via ADDRESS ] [ dev STRING ] [ weight NUMBER ] NHFLAGS\n");
  76         fprintf(stderr, "OPTIONS := FLAGS [ mtu NUMBER ] [ advmss NUMBER ]\n");
  77         fprintf(stderr, "           [ rtt TIME ] [ rttvar TIME ] [reordering NUMBER ]\n");
  78         fprintf(stderr, "           [ window NUMBER] [ cwnd NUMBER ] [ initcwnd NUMBER ]\n");
  79         fprintf(stderr, "           [ ssthresh NUMBER ] [ realms REALM ] [ src ADDRESS ]\n");
  80         fprintf(stderr, "           [ rto_min TIME ] [ hoplimit NUMBER ] [ initrwnd NUMBER ]\n");
  81         fprintf(stderr, "TYPE := [ unicast | local | broadcast | multicast | throw |\n");
  82         fprintf(stderr, "          unreachable | prohibit | blackhole | nat ]\n");
  83         fprintf(stderr, "TABLE_ID := [ local | main | default | all | NUMBER ]\n");
  84         fprintf(stderr, "SCOPE := [ host | link | global | NUMBER ]\n");
  85         fprintf(stderr, "MP_ALGO := { rr | drr | random | wrandom }\n");
  86         fprintf(stderr, "NHFLAGS := [ onlink | pervasive ]\n");
  87         fprintf(stderr, "RTPROTO := [ kernel | boot | static | NUMBER ]\n");
  88         fprintf(stderr, "TIME := NUMBER[s|ms]\n");
  89         exit(-1);
  90 }
  91
  92
  93 static struct
  94 {
  95         int tb;
  96         int cloned;
  97         int flushed;
  98         char *flushb;
  99         int flushp;
 100         int flushe;
 101         int protocol, protocolmask;
 102         int scope, scopemask;
 103         int type, typemask;
 104         int tos, tosmask;
 105         int iif, iifmask;
 106         int oif, oifmask;
 107         int mark, markmask;
 108         int realm, realmmask;
 109         inet_prefix rprefsrc;
 110         inet_prefix rvia;
 111         inet_prefix rdst;
 112         inet_prefix mdst;
 113         inet_prefix rsrc;
 114         inet_prefix msrc;
 115 } filter;
 116
 117 static int flush_update(void)
 118 {
 119         if (rtnl_send_check(&rth, filter.flushb, filter.flushp) < 0) {
 120                 perror("Failed to send flush request");
 121                 return -1;
 122         }
 123         filter.flushp = 0;
 124         return 0;
 125 }
 126
 127 int filter_nlmsg(struct nlmsghdr *n, struct rtattr **tb, int host_len)
 128 {
 129         struct rtmsg *r = NLMSG_DATA(n);
 130         inet_prefix dst;
 131         inet_prefix src;
 132         inet_prefix via;
 133         inet_prefix prefsrc;
 134         __u32 table;
 135         static int ip6_multiple_tables;
 136
 137         table = rtm_get_table(r, tb);
 138
 139         if (r->rtm_family == AF_INET6 && table != RT_TABLE_MAIN)
 140                 ip6_multiple_tables = 1;
 141
 142         if (filter.cloned == !(r->rtm_flags&RTM_F_CLONED))
 143                 return 0;
 144
 145         if (r->rtm_family == AF_INET6 && !ip6_multiple_tables) {
 146                 if (filter.tb) {
 147                         if (filter.tb == RT_TABLE_LOCAL) {
 148                                 if (r->rtm_type != RTN_LOCAL)
 149                                         return 0;
 150                         } else if (filter.tb == RT_TABLE_MAIN) {
 151                                 if (r->rtm_type == RTN_LOCAL)
 152                                         return 0;
 153                         } else {
 154                                 return 0;
 155                         }
 156                 }
 157         } else {
 158                 if (filter.tb > 0 && filter.tb != table)
 159                         return 0;
 160         }
 161         if ((filter.protocol^r->rtm_protocol)&filter.protocolmask)
 162                 return 0;
 163         if ((filter.scope^r->rtm_scope)&filter.scopemask)
 164                 return 0;
 165         if ((filter.type^r->rtm_type)&filter.typemask)
 166                 return 0;
 167         if ((filter.tos^r->rtm_tos)&filter.tosmask)
 168                 return 0;
 169         if (filter.rdst.family &&
 170             (r->rtm_family != filter.rdst.family || filter.rdst.bitlen > r->rtm_dst_len))
 171                 return 0;
 172         if (filter.mdst.family &&
 173             (r->rtm_family != filter.mdst.family ||
 174              (filter.mdst.bitlen >= 0 && filter.mdst.bitlen < r->rtm_dst_len)))
 175                 return 0;
 176         if (filter.rsrc.family &&
 177             (r->rtm_family != filter.rsrc.family || filter.rsrc.bitlen > r->rtm_src_len))
 178                 return 0;
 179         if (filter.msrc.family &&
 180             (r->rtm_family != filter.msrc.family ||
 181              (filter.msrc.bitlen >= 0 && filter.msrc.bitlen < r->rtm_src_len)))
 182                 return 0;
 183         if (filter.rvia.family && r->rtm_family != filter.rvia.family)
 184                 return 0;
 185         if (filter.rprefsrc.family && r->rtm_family != filter.rprefsrc.family)
 186                 return 0;
 187
 188         memset(&dst, 0, sizeof(dst));
 189         dst.family = r->rtm_family;
 190         if (tb[RTA_DST])
 191                 memcpy(&dst.data, RTA_DATA(tb[RTA_DST]), (r->rtm_dst_len+7)/8);
 192         if (filter.rsrc.family || filter.msrc.family) {
 193                 memset(&src, 0, sizeof(src));
 194                 src.family = r->rtm_family;
 195                 if (tb[RTA_SRC])
 196                         memcpy(&src.data, RTA_DATA(tb[RTA_SRC]), (r->rtm_src_len+7)/8);
 197         }
 198         if (filter.rvia.bitlen>0) {
 199                 memset(&via, 0, sizeof(via));
 200                 via.family = r->rtm_family;
 201                 if (tb[RTA_GATEWAY])
 202                         memcpy(&via.data, RTA_DATA(tb[RTA_GATEWAY]), host_len/8);
 203         }
 204         if (filter.rprefsrc.bitlen>0) {
 205                 memset(&prefsrc, 0, sizeof(prefsrc));
 206                 prefsrc.family = r->rtm_family;
 207                 if (tb[RTA_PREFSRC])
 208                         memcpy(&prefsrc.data, RTA_DATA(tb[RTA_PREFSRC]), host_len/8);
 209         }
 210
 211         if (filter.rdst.family && inet_addr_match(&dst, &filter.rdst, filter.rdst.bitlen))
 212                 return 0;
 213         if (filter.mdst.family && filter.mdst.bitlen >= 0 &&
 214             inet_addr_match(&dst, &filter.mdst, r->rtm_dst_len))
 215                 return 0;
 216
 217         if (filter.rsrc.family && inet_addr_match(&src, &filter.rsrc, filter.rsrc.bitlen))
 218                 return 0;
 219         if (filter.msrc.family && filter.msrc.bitlen >= 0 &&
 220             inet_addr_match(&src, &filter.msrc, r->rtm_src_len))
 221                 return 0;
 222
 223         if (filter.rvia.family && inet_addr_match(&via, &filter.rvia, filter.rvia.bitlen))
 224                 return 0;
 225         if (filter.rprefsrc.family && inet_addr_match(&prefsrc, &filter.rprefsrc, filter.rprefsrc.bitlen))
 226                 return 0;
 227         if (filter.realmmask) {
 228                 __u32 realms = 0;
 229                 if (tb[RTA_FLOW])
 230                         realms = rta_getattr_u32(tb[RTA_FLOW]);
 231                 if ((realms^filter.realm)&filter.realmmask)
 232                         return 0;
 233         }
 234         if (filter.iifmask) {
 235                 int iif = 0;
 236                 if (tb[RTA_IIF])
 237                         iif = *(int*)RTA_DATA(tb[RTA_IIF]);
 238                 if ((iif^filter.iif)&filter.iifmask)
 239                         return 0;
 240         }
 241         if (filter.oifmask) {
 242                 int oif = 0;
 243                 if (tb[RTA_OIF])
 244                         oif = *(int*)RTA_DATA(tb[RTA_OIF]);
 245                 if ((oif^filter.oif)&filter.oifmask)
 246                         return 0;
 247         }
 248         if (filter.markmask) {
 249                 int mark = 0;
 250                 if (tb[RTA_MARK])
 251                         mark = *(int *)RTA_DATA(tb[RTA_MARK]);
 252                 if ((mark ^ filter.mark) & filter.markmask)
 253                         return 0;
 254         }
 255         if (filter.flushb &&
 256             r->rtm_family == AF_INET6 &&
 257             r->rtm_dst_len == 0 &&
 258             r->rtm_type == RTN_UNREACHABLE &&
 259             tb[RTA_PRIORITY] &&
 260             *(int*)RTA_DATA(tb[RTA_PRIORITY]) == -1)
 261                 return 0;
 262
 263         return 1;
 264 }
 265
 266 int calc_host_len(struct rtmsg *r)
 267 {
 268         if (r->rtm_family == AF_INET6)
 269                 return 128;
 270         else if (r->rtm_family == AF_INET)
 271                 return 32;
 272         else if (r->rtm_family == AF_DECnet)
 273                 return 16;
 274         else if (r->rtm_family == AF_IPX)
 275                 return 80;
 276         else
 277                 return -1;
 278 }
 279
 280 int print_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 281 {
 282         FILE *fp = (FILE*)arg;
 283         struct rtmsg *r = NLMSG_DATA(n);
 284         int len = n->nlmsg_len;
 285         struct rtattr * tb[RTA_MAX+1];
 286         char abuf[256];
 287         int host_len = -1;
 288         __u32 table;
 289         SPRINT_BUF(b1);
 290         static int hz;
 291
 292         if (n->nlmsg_type != RTM_NEWROUTE && n->nlmsg_type != RTM_DELROUTE) {
 293                 fprintf(stderr, "Not a route: %08x %08x %08x\n",
 294                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 295                 return 0;
 296         }
 297         if (filter.flushb && n->nlmsg_type != RTM_NEWROUTE)
 298                 return 0;
 299         len -= NLMSG_LENGTH(sizeof(*r));
 300         if (len < 0) {
 301                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 302                 return -1;
 303         }
 304
 305         host_len = calc_host_len(r);
 306
 307         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
 308         table = rtm_get_table(r, tb);
 309
 310         if (!filter_nlmsg(n, tb, host_len))
 311                 return 0;
 312
 313         if (filter.flushb) {
 314                 struct nlmsghdr *fn;
 315                 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
 316                         if (flush_update())
 317                                 return -1;
 318                 }
 319                 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
 320                 memcpy(fn, n, n->nlmsg_len);
 321                 fn->nlmsg_type = RTM_DELROUTE;
 322                 fn->nlmsg_flags = NLM_F_REQUEST;
 323                 fn->nlmsg_seq = ++rth.seq;
 324                 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
 325                 filter.flushed++;
 326                 if (show_stats < 2)
 327                         return 0;
 328         }
 329
 330         if (n->nlmsg_type == RTM_DELROUTE)
 331                 fprintf(fp, "Deleted ");
 332         if (r->rtm_type != RTN_UNICAST && !filter.type)
 333                 fprintf(fp, "%s ", rtnl_rtntype_n2a(r->rtm_type, b1, sizeof(b1)));
 334
 335         if (tb[RTA_DST]) {
 336                 if (r->rtm_dst_len != host_len) {
 337                         fprintf(fp, "%s/%u ", rt_addr_n2a(r->rtm_family,
 338                                                          RTA_PAYLOAD(tb[RTA_DST]),
 339                                                          RTA_DATA(tb[RTA_DST]),
 340                                                          abuf, sizeof(abuf)),
 341                                 r->rtm_dst_len
 342                                 );
 343                 } else {
 344                         fprintf(fp, "%s ", format_host(r->rtm_family,
 345                                                        RTA_PAYLOAD(tb[RTA_DST]),
 346                                                        RTA_DATA(tb[RTA_DST]),
 347                                                        abuf, sizeof(abuf))
 348                                 );
 349                 }
 350         } else if (r->rtm_dst_len) {
 351                 fprintf(fp, "0/%d ", r->rtm_dst_len);
 352         } else {
 353                 fprintf(fp, "default ");
 354         }
 355         if (tb[RTA_SRC]) {
 356                 if (r->rtm_src_len != host_len) {
 357                         fprintf(fp, "from %s/%u ", rt_addr_n2a(r->rtm_family,
 358                                                          RTA_PAYLOAD(tb[RTA_SRC]),
 359                                                          RTA_DATA(tb[RTA_SRC]),
 360                                                          abuf, sizeof(abuf)),
 361                                 r->rtm_src_len
 362                                 );
 363                 } else {
 364                         fprintf(fp, "from %s ", format_host(r->rtm_family,
 365                                                        RTA_PAYLOAD(tb[RTA_SRC]),
 366                                                        RTA_DATA(tb[RTA_SRC]),
 367                                                        abuf, sizeof(abuf))
 368                                 );
 369                 }
 370         } else if (r->rtm_src_len) {
 371                 fprintf(fp, "from 0/%u ", r->rtm_src_len);
 372         }
 373         if (r->rtm_tos && filter.tosmask != -1) {
 374                 SPRINT_BUF(b1);
 375                 fprintf(fp, "tos %s ", rtnl_dsfield_n2a(r->rtm_tos, b1, sizeof(b1)));
 376         }
 377
 378         if (tb[RTA_GATEWAY] && filter.rvia.bitlen != host_len) {
 379                 fprintf(fp, "via %s ",
 380                         format_host(r->rtm_family,
 381                                     RTA_PAYLOAD(tb[RTA_GATEWAY]),
 382                                     RTA_DATA(tb[RTA_GATEWAY]),
 383                                     abuf, sizeof(abuf)));
 384         }
 385         if (tb[RTA_OIF] && filter.oifmask != -1)
 386                 fprintf(fp, "dev %s ", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_OIF])));
 387
 388         if (!(r->rtm_flags&RTM_F_CLONED)) {
 389                 if (table != RT_TABLE_MAIN && !filter.tb)
 390                         fprintf(fp, " table %s ", rtnl_rttable_n2a(table, b1, sizeof(b1)));
 391                 if (r->rtm_protocol != RTPROT_BOOT && filter.protocolmask != -1)
 392                         fprintf(fp, " proto %s ", rtnl_rtprot_n2a(r->rtm_protocol, b1, sizeof(b1)));
 393                 if (r->rtm_scope != RT_SCOPE_UNIVERSE && filter.scopemask != -1)
 394                         fprintf(fp, " scope %s ", rtnl_rtscope_n2a(r->rtm_scope, b1, sizeof(b1)));
 395         }
 396         if (tb[RTA_PREFSRC] && filter.rprefsrc.bitlen != host_len) {
 397                 /* Do not use format_host(). It is our local addr
 398                    and symbolic name will not be useful.
 399                  */
 400                 fprintf(fp, " src %s ",
 401                         rt_addr_n2a(r->rtm_family,
 402                                     RTA_PAYLOAD(tb[RTA_PREFSRC]),
 403                                     RTA_DATA(tb[RTA_PREFSRC]),
 404                                     abuf, sizeof(abuf)));
 405         }
 406         if (tb[RTA_PRIORITY])
 407                 fprintf(fp, " metric %u ", rta_getattr_u32(tb[RTA_PRIORITY]));
 408         if (r->rtm_flags & RTNH_F_DEAD)
 409                 fprintf(fp, "dead ");
 410         if (r->rtm_flags & RTNH_F_ONLINK)
 411                 fprintf(fp, "onlink ");
 412         if (r->rtm_flags & RTNH_F_PERVASIVE)
 413                 fprintf(fp, "pervasive ");
 414         if (r->rtm_flags & RTM_F_NOTIFY)
 415                 fprintf(fp, "notify ");
 416         if (tb[RTA_MARK]) {
 417                 unsigned int mark = *(unsigned int*)RTA_DATA(tb[RTA_MARK]);
 418                 if (mark) {
 419                         if (mark >= 16)
 420                                 fprintf(fp, " mark 0x%x", mark);
 421                         else
 422                                 fprintf(fp, " mark %u", mark);
 423                 }
 424         }
 425
 426         if (tb[RTA_FLOW] && filter.realmmask != ~0U) {
 427                 __u32 to = rta_getattr_u32(tb[RTA_FLOW]);
 428                 __u32 from = to>>16;
 429                 to &= 0xFFFF;
 430                 fprintf(fp, "realm%s ", from ? "s" : "");
 431                 if (from) {
 432                         fprintf(fp, "%s/",
 433                                 rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 434                 }
 435                 fprintf(fp, "%s ",
 436                         rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 437         }
 438         if ((r->rtm_flags&RTM_F_CLONED) && r->rtm_family == AF_INET) {
 439                 __u32 flags = r->rtm_flags&~0xFFFF;
 440                 int first = 1;
 441
 442                 fprintf(fp, "%s    cache ", _SL_);
 443
 444 #define PRTFL(fl,flname) if (flags&RTCF_##fl) { \
 445   flags &= ~RTCF_##fl; \
 446   fprintf(fp, "%s" flname "%s", first ? "<" : "", flags ? "," : "> "); \
 447   first = 0; }
 448                 PRTFL(LOCAL, "local");
 449                 PRTFL(REJECT, "reject");
 450                 PRTFL(MULTICAST, "mc");
 451                 PRTFL(BROADCAST, "brd");
 452                 PRTFL(DNAT, "dst-nat");
 453                 PRTFL(SNAT, "src-nat");
 454                 PRTFL(MASQ, "masq");
 455                 PRTFL(DIRECTDST, "dst-direct");
 456                 PRTFL(DIRECTSRC, "src-direct");
 457                 PRTFL(REDIRECTED, "redirected");
 458                 PRTFL(DOREDIRECT, "redirect");
 459                 PRTFL(FAST, "fastroute");
 460                 PRTFL(NOTIFY, "notify");
 461                 PRTFL(TPROXY, "proxy");
 462
 463                 if (flags)
 464                         fprintf(fp, "%s%x> ", first ? "<" : "", flags);
 465                 if (tb[RTA_CACHEINFO]) {
 466                         struct rta_cacheinfo *ci = RTA_DATA(tb[RTA_CACHEINFO]);
 467                         if (!hz)
 468                                 hz = get_user_hz();
 469                         if (ci->rta_expires != 0)
 470                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 471                         if (ci->rta_error != 0)
 472                                 fprintf(fp, " error %d", ci->rta_error);
 473                         if (show_stats) {
 474                                 if (ci->rta_clntref)
 475                                         fprintf(fp, " users %d", ci->rta_clntref);
 476                                 if (ci->rta_used != 0)
 477                                         fprintf(fp, " used %d", ci->rta_used);
 478                                 if (ci->rta_lastuse != 0)
 479                                         fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
 480                         }
 481                         if (ci->rta_id)
 482                                 fprintf(fp, " ipid 0x%04x", ci->rta_id);
 483                         if (ci->rta_ts || ci->rta_tsage)
 484                                 fprintf(fp, " ts 0x%x tsage %dsec",
 485                                         ci->rta_ts, ci->rta_tsage);
 486                 }
 487         } else if (r->rtm_family == AF_INET6) {
 488                 struct rta_cacheinfo *ci = NULL;
 489                 if (tb[RTA_CACHEINFO])
 490                         ci = RTA_DATA(tb[RTA_CACHEINFO]);
 491                 if ((r->rtm_flags & RTM_F_CLONED) || (ci && ci->rta_expires)) {
 492                         if (!hz)
 493                                 hz = get_user_hz();
 494                         if (r->rtm_flags & RTM_F_CLONED)
 495                                 fprintf(fp, "%s    cache ", _SL_);
 496                         if (ci->rta_expires)
 497                                 fprintf(fp, " expires %dsec", ci->rta_expires/hz);
 498                         if (ci->rta_error != 0)
 499                                 fprintf(fp, " error %d", ci->rta_error);
 500                         if (show_stats) {
 501                                 if (ci->rta_clntref)
 502                                         fprintf(fp, " users %d", ci->rta_clntref);
 503                                 if (ci->rta_used != 0)
 504                                         fprintf(fp, " used %d", ci->rta_used);
 505                                 if (ci->rta_lastuse != 0)
 506                                         fprintf(fp, " age %dsec", ci->rta_lastuse/hz);
 507                         }
 508                 } else if (ci) {
 509                         if (ci->rta_error != 0)
 510                                 fprintf(fp, " error %d", ci->rta_error);
 511                 }
 512         }
 513         if (tb[RTA_METRICS]) {
 514                 int i;
 515                 unsigned mxlock = 0;
 516                 struct rtattr *mxrta[RTAX_MAX+1];
 517
 518                 parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
 519                             RTA_PAYLOAD(tb[RTA_METRICS]));
 520                 if (mxrta[RTAX_LOCK])
 521                         mxlock = *(unsigned*)RTA_DATA(mxrta[RTAX_LOCK]);
 522
 523                 for (i=2; i<= RTAX_MAX; i++) {
 524                         unsigned val;
 525
 526                         if (mxrta[i] == NULL)
 527                                 continue;
 528
 529                         if (i < sizeof(mx_names)/sizeof(char*) && mx_names[i])
 530                                 fprintf(fp, " %s", mx_names[i]);
 531                         else
 532                                 fprintf(fp, " metric %d", i);
 533                         if (mxlock & (1<<i))
 534                                 fprintf(fp, " lock");
 535
 536                         val = *(unsigned*)RTA_DATA(mxrta[i]);
 537                         switch (i) {
 538                         case RTAX_HOPLIMIT:
 539                                 if ((int)val == -1)
 540                                         val = 0;
 541                                 /* fall through */
 542                         default:
 543                                 fprintf(fp, " %u", val);
 544                                 break;
 545
 546                         case RTAX_RTT:
 547                         case RTAX_RTTVAR:
 548                         case RTAX_RTO_MIN:
 549                                 if (i == RTAX_RTT)
 550                                         val /= 8;
 551                                 else if (i == RTAX_RTTVAR)
 552                                         val /= 4;
 553
 554                                 if (val >= 1000)
 555                                         fprintf(fp, " %gs", val/1e3);
 556                                 else
 557                                         fprintf(fp, " %ums", val);
 558                         }
 559                 }
 560         }
 561         if (tb[RTA_IIF] && filter.iifmask != -1) {
 562                 fprintf(fp, " iif %s", ll_index_to_name(*(int*)RTA_DATA(tb[RTA_IIF])));
 563         }
 564         if (tb[RTA_MULTIPATH]) {
 565                 struct rtnexthop *nh = RTA_DATA(tb[RTA_MULTIPATH]);
 566                 int first = 0;
 567
 568                 len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
 569
 570                 for (;;) {
 571                         if (len < sizeof(*nh))
 572                                 break;
 573                         if (nh->rtnh_len > len)
 574                                 break;
 575                         if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
 576                                 if (first)
 577                                         fprintf(fp, " Oifs:");
 578                                 else
 579                                         fprintf(fp, " ");
 580                         } else
 581                                 fprintf(fp, "%s\tnexthop", _SL_);
 582                         if (nh->rtnh_len > sizeof(*nh)) {
 583                                 parse_rtattr(tb, RTA_MAX, RTNH_DATA(nh), nh->rtnh_len - sizeof(*nh));
 584                                 if (tb[RTA_GATEWAY]) {
 585                                         fprintf(fp, " via %s ",
 586                                                 format_host(r->rtm_family,
 587                                                             RTA_PAYLOAD(tb[RTA_GATEWAY]),
 588                                                             RTA_DATA(tb[RTA_GATEWAY]),
 589                                                             abuf, sizeof(abuf)));
 590                                 }
 591                                 if (tb[RTA_FLOW]) {
 592                                         __u32 to = rta_getattr_u32(tb[RTA_FLOW]);
 593                                         __u32 from = to>>16;
 594                                         to &= 0xFFFF;
 595                                         fprintf(fp, " realm%s ", from ? "s" : "");
 596                                         if (from) {
 597                                                 fprintf(fp, "%s/",
 598                                                         rtnl_rtrealm_n2a(from, b1, sizeof(b1)));
 599                                         }
 600                                         fprintf(fp, "%s",
 601                                                 rtnl_rtrealm_n2a(to, b1, sizeof(b1)));
 602                                 }
 603                         }
 604                         if (r->rtm_flags&RTM_F_CLONED && r->rtm_type == RTN_MULTICAST) {
 605                                 fprintf(fp, " %s", ll_index_to_name(nh->rtnh_ifindex));
 606                                 if (nh->rtnh_hops != 1)
 607                                         fprintf(fp, "(ttl>%d)", nh->rtnh_hops);
 608                         } else {
 609                                 fprintf(fp, " dev %s", ll_index_to_name(nh->rtnh_ifindex));
 610                                 fprintf(fp, " weight %d", nh->rtnh_hops+1);
 611                         }
 612                         if (nh->rtnh_flags & RTNH_F_DEAD)
 613                                 fprintf(fp, " dead");
 614                         if (nh->rtnh_flags & RTNH_F_ONLINK)
 615                                 fprintf(fp, " onlink");
 616                         if (nh->rtnh_flags & RTNH_F_PERVASIVE)
 617                                 fprintf(fp, " pervasive");
 618                         len -= NLMSG_ALIGN(nh->rtnh_len);
 619                         nh = RTNH_NEXT(nh);
 620                 }
 621         }
 622         fprintf(fp, "\n");
 623         fflush(fp);
 624         return 0;
 625 }
 626
 627
 628 int parse_one_nh(struct rtattr *rta, struct rtnexthop *rtnh, int *argcp, char ***argvp)
 629 {
 630         int argc = *argcp;
 631         char **argv = *argvp;
 632
 633         while (++argv, --argc > 0) {
 634                 if (strcmp(*argv, "via") == 0) {
 635                         NEXT_ARG();
 636                         rta_addattr32(rta, 4096, RTA_GATEWAY, get_addr32(*argv));
 637                         rtnh->rtnh_len += sizeof(struct rtattr) + 4;
 638                 } else if (strcmp(*argv, "dev") == 0) {
 639                         NEXT_ARG();
 640                         if ((rtnh->rtnh_ifindex = ll_name_to_index(*argv)) == 0) {
 641                                 fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
 642                                 exit(1);
 643                         }
 644                 } else if (strcmp(*argv, "weight") == 0) {
 645                         unsigned w;
 646                         NEXT_ARG();
 647                         if (get_unsigned(&w, *argv, 0) || w == 0 || w > 256)
 648                                 invarg("\"weight\" is invalid\n", *argv);
 649                         rtnh->rtnh_hops = w - 1;
 650                 } else if (strcmp(*argv, "onlink") == 0) {
 651                         rtnh->rtnh_flags |= RTNH_F_ONLINK;
 652                 } else if (matches(*argv, "realms") == 0) {
 653                         __u32 realm;
 654                         NEXT_ARG();
 655                         if (get_rt_realms(&realm, *argv))
 656                                 invarg("\"realm\" value is invalid\n", *argv);
 657                         rta_addattr32(rta, 4096, RTA_FLOW, realm);
 658                         rtnh->rtnh_len += sizeof(struct rtattr) + 4;
 659                 } else
 660                         break;
 661         }
 662         *argcp = argc;
 663         *argvp = argv;
 664         return 0;
 665 }
 666
 667 int parse_nexthops(struct nlmsghdr *n, struct rtmsg *r, int argc, char **argv)
 668 {
 669         char buf[1024];
 670         struct rtattr *rta = (void*)buf;
 671         struct rtnexthop *rtnh;
 672
 673         rta->rta_type = RTA_MULTIPATH;
 674         rta->rta_len = RTA_LENGTH(0);
 675         rtnh = RTA_DATA(rta);
 676
 677         while (argc > 0) {
 678                 if (strcmp(*argv, "nexthop") != 0) {
 679                         fprintf(stderr, "Error: \"nexthop\" or end of line is expected instead of \"%s\"\n", *argv);
 680                         exit(-1);
 681                 }
 682                 if (argc <= 1) {
 683                         fprintf(stderr, "Error: unexpected end of line after \"nexthop\"\n");
 684                         exit(-1);
 685                 }
 686                 memset(rtnh, 0, sizeof(*rtnh));
 687                 rtnh->rtnh_len = sizeof(*rtnh);
 688                 rta->rta_len += rtnh->rtnh_len;
 689                 parse_one_nh(rta, rtnh, &argc, &argv);
 690                 rtnh = RTNH_NEXT(rtnh);
 691         }
 692
 693         if (rta->rta_len > RTA_LENGTH(0))
 694                 addattr_l(n, 1024, RTA_MULTIPATH, RTA_DATA(rta), RTA_PAYLOAD(rta));
 695         return 0;
 696 }
 697
 698
 699 int iproute_modify(int cmd, unsigned flags, int argc, char **argv)
 700 {
 701         struct {
 702                 struct nlmsghdr         n;
 703                 struct rtmsg            r;
 704                 char                    buf[1024];
 705         } req;
 706         char  mxbuf[256];
 707         struct rtattr * mxrta = (void*)mxbuf;
 708         unsigned mxlock = 0;
 709         char  *d = NULL;
 710         int gw_ok = 0;
 711         int dst_ok = 0;
 712         int nhs_ok = 0;
 713         int scope_ok = 0;
 714         int table_ok = 0;
 715         int raw = 0;
 716
 717         memset(&req, 0, sizeof(req));
 718
 719         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
 720         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 721         req.n.nlmsg_type = cmd;
 722         req.r.rtm_family = preferred_family;
 723         req.r.rtm_table = RT_TABLE_MAIN;
 724         req.r.rtm_scope = RT_SCOPE_NOWHERE;
 725
 726         if (cmd != RTM_DELROUTE) {
 727                 req.r.rtm_protocol = RTPROT_BOOT;
 728                 req.r.rtm_scope = RT_SCOPE_UNIVERSE;
 729                 req.r.rtm_type = RTN_UNICAST;
 730         }
 731
 732         mxrta->rta_type = RTA_METRICS;
 733         mxrta->rta_len = RTA_LENGTH(0);
 734
 735         while (argc > 0) {
 736                 if (strcmp(*argv, "src") == 0) {
 737                         inet_prefix addr;
 738                         NEXT_ARG();
 739                         get_addr(&addr, *argv, req.r.rtm_family);
 740                         if (req.r.rtm_family == AF_UNSPEC)
 741                                 req.r.rtm_family = addr.family;
 742                         addattr_l(&req.n, sizeof(req), RTA_PREFSRC, &addr.data, addr.bytelen);
 743                 } else if (strcmp(*argv, "via") == 0) {
 744                         inet_prefix addr;
 745                         gw_ok = 1;
 746                         NEXT_ARG();
 747                         get_addr(&addr, *argv, req.r.rtm_family);
 748                         if (req.r.rtm_family == AF_UNSPEC)
 749                                 req.r.rtm_family = addr.family;
 750                         addattr_l(&req.n, sizeof(req), RTA_GATEWAY, &addr.data, addr.bytelen);
 751                 } else if (strcmp(*argv, "from") == 0) {
 752                         inet_prefix addr;
 753                         NEXT_ARG();
 754                         get_prefix(&addr, *argv, req.r.rtm_family);
 755                         if (req.r.rtm_family == AF_UNSPEC)
 756                                 req.r.rtm_family = addr.family;
 757                         if (addr.bytelen)
 758                                 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
 759                         req.r.rtm_src_len = addr.bitlen;
 760                 } else if (strcmp(*argv, "tos") == 0 ||
 761                            matches(*argv, "dsfield") == 0) {
 762                         __u32 tos;
 763                         NEXT_ARG();
 764                         if (rtnl_dsfield_a2n(&tos, *argv))
 765                                 invarg("\"tos\" value is invalid\n", *argv);
 766                         req.r.rtm_tos = tos;
 767                 } else if (matches(*argv, "metric") == 0 ||
 768                            matches(*argv, "priority") == 0 ||
 769                            matches(*argv, "preference") == 0) {
 770                         __u32 metric;
 771                         NEXT_ARG();
 772                         if (get_u32(&metric, *argv, 0))
 773                                 invarg("\"metric\" value is invalid\n", *argv);
 774                         addattr32(&req.n, sizeof(req), RTA_PRIORITY, metric);
 775                 } else if (strcmp(*argv, "scope") == 0) {
 776                         __u32 scope = 0;
 777                         NEXT_ARG();
 778                         if (rtnl_rtscope_a2n(&scope, *argv))
 779                                 invarg("invalid \"scope\" value\n", *argv);
 780                         req.r.rtm_scope = scope;
 781                         scope_ok = 1;
 782                 } else if (strcmp(*argv, "mtu") == 0) {
 783                         unsigned mtu;
 784                         NEXT_ARG();
 785                         if (strcmp(*argv, "lock") == 0) {
 786                                 mxlock |= (1<<RTAX_MTU);
 787                                 NEXT_ARG();
 788                         }
 789                         if (get_unsigned(&mtu, *argv, 0))
 790                                 invarg("\"mtu\" value is invalid\n", *argv);
 791                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_MTU, mtu);
 792                 } else if (strcmp(*argv, "hoplimit") == 0) {
 793                         unsigned hoplimit;
 794                         NEXT_ARG();
 795                         if (strcmp(*argv, "lock") == 0) {
 796                                 mxlock |= (1<<RTAX_HOPLIMIT);
 797                                 NEXT_ARG();
 798                         }
 799                         if (get_unsigned(&hoplimit, *argv, 0))
 800                                 invarg("\"hoplimit\" value is invalid\n", *argv);
 801                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_HOPLIMIT, hoplimit);
 802                 } else if (strcmp(*argv, "advmss") == 0) {
 803                         unsigned mss;
 804                         NEXT_ARG();
 805                         if (strcmp(*argv, "lock") == 0) {
 806                                 mxlock |= (1<<RTAX_ADVMSS);
 807                                 NEXT_ARG();
 808                         }
 809                         if (get_unsigned(&mss, *argv, 0))
 810                                 invarg("\"mss\" value is invalid\n", *argv);
 811                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_ADVMSS, mss);
 812                 } else if (matches(*argv, "reordering") == 0) {
 813                         unsigned reord;
 814                         NEXT_ARG();
 815                         if (strcmp(*argv, "lock") == 0) {
 816                                 mxlock |= (1<<RTAX_REORDERING);
 817                                 NEXT_ARG();
 818                         }
 819                         if (get_unsigned(&reord, *argv, 0))
 820                                 invarg("\"reordering\" value is invalid\n", *argv);
 821                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_REORDERING, reord);
 822                 } else if (strcmp(*argv, "rtt") == 0) {
 823                         unsigned rtt;
 824                         NEXT_ARG();
 825                         if (strcmp(*argv, "lock") == 0) {
 826                                 mxlock |= (1<<RTAX_RTT);
 827                                 NEXT_ARG();
 828                         }
 829                         if (get_time_rtt(&rtt, *argv, &raw))
 830                                 invarg("\"rtt\" value is invalid\n", *argv);
 831                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTT,
 832                                 (raw) ? rtt : rtt * 8);
 833                 } else if (strcmp(*argv, "rto_min") == 0) {
 834                         unsigned rto_min;
 835                         NEXT_ARG();
 836                         mxlock |= (1<<RTAX_RTO_MIN);
 837                         if (get_time_rtt(&rto_min, *argv, &raw))
 838                                 invarg("\"rto_min\" value is invalid\n",
 839                                        *argv);
 840                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTO_MIN,
 841                                       rto_min);
 842                 } else if (matches(*argv, "window") == 0) {
 843                         unsigned win;
 844                         NEXT_ARG();
 845                         if (strcmp(*argv, "lock") == 0) {
 846                                 mxlock |= (1<<RTAX_WINDOW);
 847                                 NEXT_ARG();
 848                         }
 849                         if (get_unsigned(&win, *argv, 0))
 850                                 invarg("\"window\" value is invalid\n", *argv);
 851                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_WINDOW, win);
 852                 } else if (matches(*argv, "cwnd") == 0) {
 853                         unsigned win;
 854                         NEXT_ARG();
 855                         if (strcmp(*argv, "lock") == 0) {
 856                                 mxlock |= (1<<RTAX_CWND);
 857                                 NEXT_ARG();
 858                         }
 859                         if (get_unsigned(&win, *argv, 0))
 860                                 invarg("\"cwnd\" value is invalid\n", *argv);
 861                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_CWND, win);
 862                 } else if (matches(*argv, "initcwnd") == 0) {
 863                         unsigned win;
 864                         NEXT_ARG();
 865                         if (strcmp(*argv, "lock") == 0) {
 866                                 mxlock |= (1<<RTAX_INITCWND);
 867                                 NEXT_ARG();
 868                         }
 869                         if (get_unsigned(&win, *argv, 0))
 870                                 invarg("\"initcwnd\" value is invalid\n", *argv);
 871                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITCWND, win);
 872                 } else if (matches(*argv, "initrwnd") == 0) {
 873                         unsigned win;
 874                         NEXT_ARG();
 875                         if (strcmp(*argv, "lock") == 0) {
 876                                 mxlock |= (1<<RTAX_INITRWND);
 877                                 NEXT_ARG();
 878                         }
 879                         if (get_unsigned(&win, *argv, 0))
 880                                 invarg("\"initrwnd\" value is invalid\n", *argv);
 881                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_INITRWND, win);
 882                 } else if (matches(*argv, "rttvar") == 0) {
 883                         unsigned win;
 884                         NEXT_ARG();
 885                         if (strcmp(*argv, "lock") == 0) {
 886                                 mxlock |= (1<<RTAX_RTTVAR);
 887                                 NEXT_ARG();
 888                         }
 889                         if (get_time_rtt(&win, *argv, &raw))
 890                                 invarg("\"rttvar\" value is invalid\n", *argv);
 891                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_RTTVAR,
 892                                 (raw) ? win : win * 4);
 893                 } else if (matches(*argv, "ssthresh") == 0) {
 894                         unsigned win;
 895                         NEXT_ARG();
 896                         if (strcmp(*argv, "lock") == 0) {
 897                                 mxlock |= (1<<RTAX_SSTHRESH);
 898                                 NEXT_ARG();
 899                         }
 900                         if (get_unsigned(&win, *argv, 0))
 901                                 invarg("\"ssthresh\" value is invalid\n", *argv);
 902                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_SSTHRESH, win);
 903                 } else if (matches(*argv, "realms") == 0) {
 904                         __u32 realm;
 905                         NEXT_ARG();
 906                         if (get_rt_realms(&realm, *argv))
 907                                 invarg("\"realm\" value is invalid\n", *argv);
 908                         addattr32(&req.n, sizeof(req), RTA_FLOW, realm);
 909                 } else if (strcmp(*argv, "onlink") == 0) {
 910                         req.r.rtm_flags |= RTNH_F_ONLINK;
 911                 } else if (strcmp(*argv, "nexthop") == 0) {
 912                         nhs_ok = 1;
 913                         break;
 914                 } else if (matches(*argv, "protocol") == 0) {
 915                         __u32 prot;
 916                         NEXT_ARG();
 917                         if (rtnl_rtprot_a2n(&prot, *argv))
 918                                 invarg("\"protocol\" value is invalid\n", *argv);
 919                         req.r.rtm_protocol = prot;
 920                 } else if (matches(*argv, "table") == 0) {
 921                         __u32 tid;
 922                         NEXT_ARG();
 923                         if (rtnl_rttable_a2n(&tid, *argv))
 924                                 invarg("\"table\" value is invalid\n", *argv);
 925                         if (tid < 256)
 926                                 req.r.rtm_table = tid;
 927                         else {
 928                                 req.r.rtm_table = RT_TABLE_UNSPEC;
 929                                 addattr32(&req.n, sizeof(req), RTA_TABLE, tid);
 930                         }
 931                         table_ok = 1;
 932                 } else if (strcmp(*argv, "dev") == 0 ||
 933                            strcmp(*argv, "oif") == 0) {
 934                         NEXT_ARG();
 935                         d = *argv;
 936                 } else {
 937                         int type;
 938                         inet_prefix dst;
 939
 940                         if (strcmp(*argv, "to") == 0) {
 941                                 NEXT_ARG();
 942                         }
 943                         if ((**argv < '0' || **argv > '9') &&
 944                             rtnl_rtntype_a2n(&type, *argv) == 0) {
 945                                 NEXT_ARG();
 946                                 req.r.rtm_type = type;
 947                         }
 948
 949                         if (matches(*argv, "help") == 0)
 950                                 usage();
 951                         if (dst_ok)
 952                                 duparg2("to", *argv);
 953                         get_prefix(&dst, *argv, req.r.rtm_family);
 954                         if (req.r.rtm_family == AF_UNSPEC)
 955                                 req.r.rtm_family = dst.family;
 956                         req.r.rtm_dst_len = dst.bitlen;
 957                         dst_ok = 1;
 958                         if (dst.bytelen)
 959                                 addattr_l(&req.n, sizeof(req), RTA_DST, &dst.data, dst.bytelen);
 960                 }
 961                 argc--; argv++;
 962         }
 963
 964         if (d || nhs_ok)  {
 965                 int idx;
 966
 967                 ll_init_map(&rth);
 968
 969                 if (d) {
 970                         if ((idx = ll_name_to_index(d)) == 0) {
 971                                 fprintf(stderr, "Cannot find device \"%s\"\n", d);
 972                                 return -1;
 973                         }
 974                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
 975                 }
 976         }
 977
 978         if (mxrta->rta_len > RTA_LENGTH(0)) {
 979                 if (mxlock)
 980                         rta_addattr32(mxrta, sizeof(mxbuf), RTAX_LOCK, mxlock);
 981                 addattr_l(&req.n, sizeof(req), RTA_METRICS, RTA_DATA(mxrta), RTA_PAYLOAD(mxrta));
 982         }
 983
 984         if (nhs_ok)
 985                 parse_nexthops(&req.n, &req.r, argc, argv);
 986
 987         if (!table_ok) {
 988                 if (req.r.rtm_type == RTN_LOCAL ||
 989                     req.r.rtm_type == RTN_BROADCAST ||
 990                     req.r.rtm_type == RTN_NAT ||
 991                     req.r.rtm_type == RTN_ANYCAST)
 992                         req.r.rtm_table = RT_TABLE_LOCAL;
 993         }
 994         if (!scope_ok) {
 995                 if (req.r.rtm_type == RTN_LOCAL ||
 996                     req.r.rtm_type == RTN_NAT)
 997                         req.r.rtm_scope = RT_SCOPE_HOST;
 998                 else if (req.r.rtm_type == RTN_BROADCAST ||
 999                          req.r.rtm_type == RTN_MULTICAST ||
1000                          req.r.rtm_type == RTN_ANYCAST)
1001                         req.r.rtm_scope = RT_SCOPE_LINK;
1002                 else if (req.r.rtm_type == RTN_UNICAST ||
1003                          req.r.rtm_type == RTN_UNSPEC) {
1004                         if (cmd == RTM_DELROUTE)
1005                                 req.r.rtm_scope = RT_SCOPE_NOWHERE;
1006                         else if (!gw_ok && !nhs_ok)
1007                                 req.r.rtm_scope = RT_SCOPE_LINK;
1008                 }
1009         }
1010
1011         if (req.r.rtm_family == AF_UNSPEC)
1012                 req.r.rtm_family = AF_INET;
1013
1014         if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
1015                 exit(2);
1016
1017         return 0;
1018 }
1019
1020 static int rtnl_rtcache_request(struct rtnl_handle *rth, int family)
1021 {
1022         struct {
1023                 struct nlmsghdr nlh;
1024                 struct rtmsg rtm;
1025         } req;
1026         struct sockaddr_nl nladdr;
1027
1028         memset(&nladdr, 0, sizeof(nladdr));
1029         memset(&req, 0, sizeof(req));
1030         nladdr.nl_family = AF_NETLINK;
1031
1032         req.nlh.nlmsg_len = sizeof(req);
1033         req.nlh.nlmsg_type = RTM_GETROUTE;
1034         req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_REQUEST;
1035         req.nlh.nlmsg_pid = 0;
1036         req.nlh.nlmsg_seq = rth->dump = ++rth->seq;
1037         req.rtm.rtm_family = family;
1038         req.rtm.rtm_flags |= RTM_F_CLONED;
1039
1040         return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
1041 }
1042
1043 static int iproute_flush_cache(void)
1044 {
1045 #define ROUTE_FLUSH_PATH "/proc/sys/net/ipv4/route/flush"
1046
1047         int len;
1048         int flush_fd = open (ROUTE_FLUSH_PATH, O_WRONLY);
1049         char *buffer = "-1";
1050
1051         if (flush_fd < 0) {
1052                 fprintf (stderr, "Cannot open \"%s\"\n", ROUTE_FLUSH_PATH);
1053                 return -1;
1054         }
1055
1056         len = strlen (buffer);
1057
1058         if ((write (flush_fd, (void *)buffer, len)) < len) {
1059                 fprintf (stderr, "Cannot flush routing cache\n");
1060                 close(flush_fd);
1061                 return -1;
1062         }
1063         close(flush_fd);
1064         return 0;
1065 }
1066
1067 int save_route(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
1068 {
1069         int ret;
1070         int len = n->nlmsg_len;
1071         struct rtmsg *r = NLMSG_DATA(n);
1072         struct rtattr *tb[RTA_MAX+1];
1073         int host_len = -1;
1074
1075         if (isatty(STDOUT_FILENO)) {
1076                 fprintf(stderr, "Not sending binary stream to stdout\n");
1077                 return -1;
1078         }
1079
1080         host_len = calc_host_len(r);
1081         len -= NLMSG_LENGTH(sizeof(*r));
1082         parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1083
1084         if (!filter_nlmsg(n, tb, host_len))
1085                 return 0;
1086
1087         ret = write(STDOUT_FILENO, n, n->nlmsg_len);
1088         if ((ret > 0) && (ret != n->nlmsg_len)) {
1089                 fprintf(stderr, "Short write while saving nlmsg\n");
1090                 ret = -EIO;
1091         }
1092
1093         return ret == n->nlmsg_len ? 0 : ret;
1094 }
1095
1096 static int iproute_list_flush_or_save(int argc, char **argv, int action)
1097 {
1098         int do_ipv6 = preferred_family;
1099         char *id = NULL;
1100         char *od = NULL;
1101         unsigned int mark = 0;
1102         rtnl_filter_t filter_fn;
1103
1104         if (action == IPROUTE_SAVE)
1105                 filter_fn = save_route;
1106         else
1107                 filter_fn = print_route;
1108
1109         iproute_reset_filter();
1110         filter.tb = RT_TABLE_MAIN;
1111
1112         if ((action == IPROUTE_FLUSH) && argc <= 0) {
1113                 fprintf(stderr, "\"ip route flush\" requires arguments.\n");
1114                 return -1;
1115         }
1116
1117         while (argc > 0) {
1118                 if (matches(*argv, "table") == 0) {
1119                         __u32 tid;
1120                         NEXT_ARG();
1121                         if (rtnl_rttable_a2n(&tid, *argv)) {
1122                                 if (strcmp(*argv, "all") == 0) {
1123                                         filter.tb = 0;
1124                                 } else if (strcmp(*argv, "cache") == 0) {
1125                                         filter.cloned = 1;
1126                                 } else if (strcmp(*argv, "help") == 0) {
1127                                         usage();
1128                                 } else {
1129                                         invarg("table id value is invalid\n", *argv);
1130                                 }
1131                         } else
1132                                 filter.tb = tid;
1133                 } else if (matches(*argv, "cached") == 0 ||
1134                            matches(*argv, "cloned") == 0) {
1135                         filter.cloned = 1;
1136                 } else if (strcmp(*argv, "tos") == 0 ||
1137                            matches(*argv, "dsfield") == 0) {
1138                         __u32 tos;
1139                         NEXT_ARG();
1140                         if (rtnl_dsfield_a2n(&tos, *argv))
1141                                 invarg("TOS value is invalid\n", *argv);
1142                         filter.tos = tos;
1143                         filter.tosmask = -1;
1144                 } else if (matches(*argv, "protocol") == 0) {
1145                         __u32 prot = 0;
1146                         NEXT_ARG();
1147                         filter.protocolmask = -1;
1148                         if (rtnl_rtprot_a2n(&prot, *argv)) {
1149                                 if (strcmp(*argv, "all") != 0)
1150                                         invarg("invalid \"protocol\"\n", *argv);
1151                                 prot = 0;
1152                                 filter.protocolmask = 0;
1153                         }
1154                         filter.protocol = prot;
1155                 } else if (matches(*argv, "scope") == 0) {
1156                         __u32 scope = 0;
1157                         NEXT_ARG();
1158                         filter.scopemask = -1;
1159                         if (rtnl_rtscope_a2n(&scope, *argv)) {
1160                                 if (strcmp(*argv, "all") != 0)
1161                                         invarg("invalid \"scope\"\n", *argv);
1162                                 scope = RT_SCOPE_NOWHERE;
1163                                 filter.scopemask = 0;
1164                         }
1165                         filter.scope = scope;
1166                 } else if (matches(*argv, "type") == 0) {
1167                         int type;
1168                         NEXT_ARG();
1169                         filter.typemask = -1;
1170                         if (rtnl_rtntype_a2n(&type, *argv))
1171                                 invarg("node type value is invalid\n", *argv);
1172                         filter.type = type;
1173                 } else if (strcmp(*argv, "dev") == 0 ||
1174                            strcmp(*argv, "oif") == 0) {
1175                         NEXT_ARG();
1176                         od = *argv;
1177                 } else if (strcmp(*argv, "iif") == 0) {
1178                         NEXT_ARG();
1179                         id = *argv;
1180                 } else if (strcmp(*argv, "mark") == 0) {
1181                         NEXT_ARG();
1182                         get_unsigned(&mark, *argv, 0);
1183                         filter.markmask = -1;
1184                 } else if (strcmp(*argv, "via") == 0) {
1185                         NEXT_ARG();
1186                         get_prefix(&filter.rvia, *argv, do_ipv6);
1187                 } else if (strcmp(*argv, "src") == 0) {
1188                         NEXT_ARG();
1189                         get_prefix(&filter.rprefsrc, *argv, do_ipv6);
1190                 } else if (matches(*argv, "realms") == 0) {
1191                         __u32 realm;
1192                         NEXT_ARG();
1193                         if (get_rt_realms(&realm, *argv))
1194                                 invarg("invalid realms\n", *argv);
1195                         filter.realm = realm;
1196                         filter.realmmask = ~0U;
1197                         if ((filter.realm&0xFFFF) == 0 &&
1198                             (*argv)[strlen(*argv) - 1] == '/')
1199                                 filter.realmmask &= ~0xFFFF;
1200                         if ((filter.realm&0xFFFF0000U) == 0 &&
1201                             (strchr(*argv, '/') == NULL ||
1202                              (*argv)[0] == '/'))
1203                                 filter.realmmask &= ~0xFFFF0000U;
1204                 } else if (matches(*argv, "from") == 0) {
1205                         NEXT_ARG();
1206                         if (matches(*argv, "root") == 0) {
1207                                 NEXT_ARG();
1208                                 get_prefix(&filter.rsrc, *argv, do_ipv6);
1209                         } else if (matches(*argv, "match") == 0) {
1210                                 NEXT_ARG();
1211                                 get_prefix(&filter.msrc, *argv, do_ipv6);
1212                         } else {
1213                                 if (matches(*argv, "exact") == 0) {
1214                                         NEXT_ARG();
1215                                 }
1216                                 get_prefix(&filter.msrc, *argv, do_ipv6);
1217                                 filter.rsrc = filter.msrc;
1218                         }
1219                 } else {
1220                         if (matches(*argv, "to") == 0) {
1221                                 NEXT_ARG();
1222                         }
1223                         if (matches(*argv, "root") == 0) {
1224                                 NEXT_ARG();
1225                                 get_prefix(&filter.rdst, *argv, do_ipv6);
1226                         } else if (matches(*argv, "match") == 0) {
1227                                 NEXT_ARG();
1228                                 get_prefix(&filter.mdst, *argv, do_ipv6);
1229                         } else {
1230                                 if (matches(*argv, "exact") == 0) {
1231                                         NEXT_ARG();
1232                                 }
1233                                 get_prefix(&filter.mdst, *argv, do_ipv6);
1234                                 filter.rdst = filter.mdst;
1235                         }
1236                 }
1237                 argc--; argv++;
1238         }
1239
1240         if (do_ipv6 == AF_UNSPEC && filter.tb)
1241                 do_ipv6 = AF_INET;
1242
1243         ll_init_map(&rth);
1244
1245         if (id || od)  {
1246                 int idx;
1247
1248                 if (id) {
1249                         if ((idx = ll_name_to_index(id)) == 0) {
1250                                 fprintf(stderr, "Cannot find device \"%s\"\n", id);
1251                                 return -1;
1252                         }
1253                         filter.iif = idx;
1254                         filter.iifmask = -1;
1255                 }
1256                 if (od) {
1257                         if ((idx = ll_name_to_index(od)) == 0) {
1258                                 fprintf(stderr, "Cannot find device \"%s\"\n", od);
1259                                 return -1;
1260                         }
1261                         filter.oif = idx;
1262                         filter.oifmask = -1;
1263                 }
1264         }
1265         filter.mark = mark;
1266
1267         if (action == IPROUTE_FLUSH) {
1268                 int round = 0;
1269                 char flushb[4096-512];
1270                 time_t start = time(0);
1271
1272                 if (filter.cloned) {
1273                         if (do_ipv6 != AF_INET6) {
1274                                 iproute_flush_cache();
1275                                 if (show_stats)
1276                                         printf("*** IPv4 routing cache is flushed.\n");
1277                         }
1278                         if (do_ipv6 == AF_INET)
1279                                 return 0;
1280                 }
1281
1282                 filter.flushb = flushb;
1283                 filter.flushp = 0;
1284                 filter.flushe = sizeof(flushb);
1285
1286                 for (;;) {
1287                         if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1288                                 perror("Cannot send dump request");
1289                                 exit(1);
1290                         }
1291                         filter.flushed = 0;
1292                         if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1293                                 fprintf(stderr, "Flush terminated\n");
1294                                 exit(1);
1295                         }
1296                         if (filter.flushed == 0) {
1297                                 if (show_stats) {
1298                                         if (round == 0 && (!filter.cloned || do_ipv6 == AF_INET6))
1299                                                 printf("Nothing to flush.\n");
1300                                         else
1301                                                 printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
1302                                 }
1303                                 fflush(stdout);
1304                                 return 0;
1305                         }
1306                         round++;
1307                         if (flush_update() < 0)
1308                                 exit(1);
1309
1310                         if (time(0) - start > 30) {
1311                                 printf("\n*** Flush not completed after %ld seconds, %d entries remain ***\n",
1312                                        time(0) - start, filter.flushed);
1313                                 exit(1);
1314                         }
1315
1316                         if (show_stats) {
1317                                 printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
1318                                 fflush(stdout);
1319                         }
1320                 }
1321         }
1322
1323         if (!filter.cloned) {
1324                 if (rtnl_wilddump_request(&rth, do_ipv6, RTM_GETROUTE) < 0) {
1325                         perror("Cannot send dump request");
1326                         exit(1);
1327                 }
1328         } else {
1329                 if (rtnl_rtcache_request(&rth, do_ipv6) < 0) {
1330                         perror("Cannot send dump request");
1331                         exit(1);
1332                 }
1333         }
1334
1335         if (rtnl_dump_filter(&rth, filter_fn, stdout) < 0) {
1336                 fprintf(stderr, "Dump terminated\n");
1337                 exit(1);
1338         }
1339
1340         exit(0);
1341 }
1342
1343
1344 int iproute_get(int argc, char **argv)
1345 {
1346         struct {
1347                 struct nlmsghdr         n;
1348                 struct rtmsg            r;
1349                 char                    buf[1024];
1350         } req;
1351         char  *idev = NULL;
1352         char  *odev = NULL;
1353         int connected = 0;
1354         int from_ok = 0;
1355         unsigned int mark = 0;
1356
1357         memset(&req, 0, sizeof(req));
1358
1359         iproute_reset_filter();
1360         filter.cloned = 2;
1361
1362         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
1363         req.n.nlmsg_flags = NLM_F_REQUEST;
1364         req.n.nlmsg_type = RTM_GETROUTE;
1365         req.r.rtm_family = preferred_family;
1366         req.r.rtm_table = 0;
1367         req.r.rtm_protocol = 0;
1368         req.r.rtm_scope = 0;
1369         req.r.rtm_type = 0;
1370         req.r.rtm_src_len = 0;
1371         req.r.rtm_dst_len = 0;
1372         req.r.rtm_tos = 0;
1373
1374         while (argc > 0) {
1375                 if (strcmp(*argv, "tos") == 0 ||
1376                     matches(*argv, "dsfield") == 0) {
1377                         __u32 tos;
1378                         NEXT_ARG();
1379                         if (rtnl_dsfield_a2n(&tos, *argv))
1380                                 invarg("TOS value is invalid\n", *argv);
1381                         req.r.rtm_tos = tos;
1382                 } else if (matches(*argv, "from") == 0) {
1383                         inet_prefix addr;
1384                         NEXT_ARG();
1385                         if (matches(*argv, "help") == 0)
1386                                 usage();
1387                         from_ok = 1;
1388                         get_prefix(&addr, *argv, req.r.rtm_family);
1389                         if (req.r.rtm_family == AF_UNSPEC)
1390                                 req.r.rtm_family = addr.family;
1391                         if (addr.bytelen)
1392                                 addattr_l(&req.n, sizeof(req), RTA_SRC, &addr.data, addr.bytelen);
1393                         req.r.rtm_src_len = addr.bitlen;
1394                 } else if (matches(*argv, "iif") == 0) {
1395                         NEXT_ARG();
1396                         idev = *argv;
1397                 } else if (matches(*argv, "mark") == 0) {
1398                         NEXT_ARG();
1399                         get_unsigned(&mark, *argv, 0);
1400                 } else if (matches(*argv, "oif") == 0 ||
1401                            strcmp(*argv, "dev") == 0) {
1402                         NEXT_ARG();
1403                         odev = *argv;
1404                 } else if (matches(*argv, "notify") == 0) {
1405                         req.r.rtm_flags |= RTM_F_NOTIFY;
1406                 } else if (matches(*argv, "connected") == 0) {
1407                         connected = 1;
1408                 } else {
1409                         inet_prefix addr;
1410                         if (strcmp(*argv, "to") == 0) {
1411                                 NEXT_ARG();
1412                         }
1413                         if (matches(*argv, "help") == 0)
1414                                 usage();
1415                         get_prefix(&addr, *argv, req.r.rtm_family);
1416                         if (req.r.rtm_family == AF_UNSPEC)
1417                                 req.r.rtm_family = addr.family;
1418                         if (addr.bytelen)
1419                                 addattr_l(&req.n, sizeof(req), RTA_DST, &addr.data, addr.bytelen);
1420                         req.r.rtm_dst_len = addr.bitlen;
1421                 }
1422                 argc--; argv++;
1423         }
1424
1425         if (req.r.rtm_dst_len == 0) {
1426                 fprintf(stderr, "need at least destination address\n");
1427                 exit(1);
1428         }
1429
1430         ll_init_map(&rth);
1431
1432         if (idev || odev)  {
1433                 int idx;
1434
1435                 if (idev) {
1436                         if ((idx = ll_name_to_index(idev)) == 0) {
1437                                 fprintf(stderr, "Cannot find device \"%s\"\n", idev);
1438                                 return -1;
1439                         }
1440                         addattr32(&req.n, sizeof(req), RTA_IIF, idx);
1441                 }
1442                 if (odev) {
1443                         if ((idx = ll_name_to_index(odev)) == 0) {
1444                                 fprintf(stderr, "Cannot find device \"%s\"\n", odev);
1445                                 return -1;
1446                         }
1447                         addattr32(&req.n, sizeof(req), RTA_OIF, idx);
1448                 }
1449         }
1450         if (mark)
1451                 addattr32(&req.n, sizeof(req), RTA_MARK, mark);
1452
1453         if (req.r.rtm_family == AF_UNSPEC)
1454                 req.r.rtm_family = AF_INET;
1455
1456         if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0)
1457                 exit(2);
1458
1459         if (connected && !from_ok) {
1460                 struct rtmsg *r = NLMSG_DATA(&req.n);
1461                 int len = req.n.nlmsg_len;
1462                 struct rtattr * tb[RTA_MAX+1];
1463
1464                 if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1465                         fprintf(stderr, "An error :-)\n");
1466                         exit(1);
1467                 }
1468
1469                 if (req.n.nlmsg_type != RTM_NEWROUTE) {
1470                         fprintf(stderr, "Not a route?\n");
1471                         return -1;
1472                 }
1473                 len -= NLMSG_LENGTH(sizeof(*r));
1474                 if (len < 0) {
1475                         fprintf(stderr, "Wrong len %d\n", len);
1476                         return -1;
1477                 }
1478
1479                 parse_rtattr(tb, RTA_MAX, RTM_RTA(r), len);
1480
1481                 if (tb[RTA_PREFSRC]) {
1482                         tb[RTA_PREFSRC]->rta_type = RTA_SRC;
1483                         r->rtm_src_len = 8*RTA_PAYLOAD(tb[RTA_PREFSRC]);
1484                 } else if (!tb[RTA_SRC]) {
1485                         fprintf(stderr, "Failed to connect the route\n");
1486                         return -1;
1487                 }
1488                 if (!odev && tb[RTA_OIF])
1489                         tb[RTA_OIF]->rta_type = 0;
1490                 if (tb[RTA_GATEWAY])
1491                         tb[RTA_GATEWAY]->rta_type = 0;
1492                 if (!idev && tb[RTA_IIF])
1493                         tb[RTA_IIF]->rta_type = 0;
1494                 req.n.nlmsg_flags = NLM_F_REQUEST;
1495                 req.n.nlmsg_type = RTM_GETROUTE;
1496
1497                 if (rtnl_talk(&rth, &req.n, 0, 0, &req.n) < 0)
1498                         exit(2);
1499         }
1500
1501         if (print_route(NULL, &req.n, (void*)stdout) < 0) {
1502                 fprintf(stderr, "An error :-)\n");
1503                 exit(1);
1504         }
1505
1506         exit(0);
1507 }
1508
1509 int restore_handler(const struct sockaddr_nl *nl, struct nlmsghdr *n, void *arg)
1510 {
1511         int ret;
1512
1513         n->nlmsg_flags |= NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
1514
1515         ll_init_map(&rth);
1516
1517         ret = rtnl_talk(&rth, n, 0, 0, n);
1518         if ((ret < 0) && (errno == EEXIST))
1519                 ret = 0;
1520
1521         return ret;
1522 }
1523
1524 int iproute_restore(void)
1525 {
1526         exit(rtnl_from_file(stdin, &restore_handler, NULL));
1527 }
1528
1529 void iproute_reset_filter()
1530 {
1531         memset(&filter, 0, sizeof(filter));
1532         filter.mdst.bitlen = -1;
1533         filter.msrc.bitlen = -1;
1534 }
1535
1536 int do_iproute(int argc, char **argv)
1537 {
1538         if (argc < 1)
1539                 return iproute_list_flush_or_save(0, NULL, IPROUTE_LIST);
1540
1541         if (matches(*argv, "add") == 0)
1542                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_EXCL,
1543                                       argc-1, argv+1);
1544         if (matches(*argv, "change") == 0 || strcmp(*argv, "chg") == 0)
1545                 return iproute_modify(RTM_NEWROUTE, NLM_F_REPLACE,
1546                                       argc-1, argv+1);
1547         if (matches(*argv, "replace") == 0)
1548                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_REPLACE,
1549                                       argc-1, argv+1);
1550         if (matches(*argv, "prepend") == 0)
1551                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE,
1552                                       argc-1, argv+1);
1553         if (matches(*argv, "append") == 0)
1554                 return iproute_modify(RTM_NEWROUTE, NLM_F_CREATE|NLM_F_APPEND,
1555                                       argc-1, argv+1);
1556         if (matches(*argv, "test") == 0)
1557                 return iproute_modify(RTM_NEWROUTE, NLM_F_EXCL,
1558                                       argc-1, argv+1);
1559         if (matches(*argv, "delete") == 0)
1560                 return iproute_modify(RTM_DELROUTE, 0,
1561                                       argc-1, argv+1);
1562         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
1563             || matches(*argv, "lst") == 0)
1564                 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_LIST);
1565         if (matches(*argv, "get") == 0)
1566                 return iproute_get(argc-1, argv+1);
1567         if (matches(*argv, "flush") == 0)
1568                 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_FLUSH);
1569         if (matches(*argv, "save") == 0)
1570                 return iproute_list_flush_or_save(argc-1, argv+1, IPROUTE_SAVE);
1571         if (matches(*argv, "restore") == 0)
1572                 return iproute_restore();
1573         if (matches(*argv, "help") == 0)
1574                 usage();
1575         fprintf(stderr, "Command \"%s\" is unknown, try \"ip route help\".\n", *argv);
1576         exit(-1);
1577 }
1578