zebra/rt_ioctl.c

   1 /*
   2  * kernel routing table update by ioctl().
   3  * Copyright (C) 1997, 98 Kunihiro Ishiguro
   4  *
   5  * This file is part of GNU Zebra.
   6  *
   7  * GNU Zebra is free software; you can redistribute it and/or modify it
   8  * under the terms of the GNU General Public License as published by the
   9  * Free Software Foundation; either version 2, or (at your option) any
  10  * later version.
  11  *
  12  * GNU Zebra is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  19  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  20  * 02111-1307, USA.
  21  */
  22
  23 #include <zebra.h>
  24
  25 #include "prefix.h"
  26 #include "log.h"
  27 #include "if.h"
  28
  29 #include "zebra/rib.h"
  30 #include "zebra/debug.h"
  31
  32 /* Initialize of kernel interface.  There is no kernel communication
  33    support under ioctl().  So this is dummy stub function. */
  34 void
  35 kernel_init ()
  36 {
  37   return;
  38 }
  39
  40 /* Dummy function of routing socket. */
  41 void
  42 kernel_read (int sock)
  43 {
  44   return;
  45 }
  46
  47 #if 0
  48 /* Initialization prototype of struct sockaddr_in. */
  49 static struct sockaddr_in sin_proto =
  50 {
  51 #ifdef HAVE_SIN_LEN
  52   sizeof (struct sockaddr_in),
  53 #endif /* HAVE_SIN_LEN */
  54   AF_INET, 0, {0}, {0}
  55 };
  56 #endif /* 0 */
  57
  58 /* Solaris has ortentry. */
  59 #ifdef HAVE_OLD_RTENTRY
  60 #define rtentry ortentry
  61 #endif /* HAVE_OLD_RTENTRY */
  62
  63 /* Interface to ioctl route message. */
  64 int
  65 kernel_add_route (struct prefix_ipv4 *dest, struct in_addr *gate,
  66                   int index, int flags)
  67 {
  68   int ret;
  69   int sock;
  70   struct rtentry rtentry;
  71   struct sockaddr_in sin_dest, sin_mask, sin_gate;
  72
  73   memset (&rtentry, 0, sizeof (struct rtentry));
  74
  75   /* Make destination. */
  76   memset (&sin_dest, 0, sizeof (struct sockaddr_in));
  77   sin_dest.sin_family = AF_INET;
  78 #ifdef HAVE_SIN_LEN
  79   sin_dest.sin_len = sizeof (struct sockaddr_in);
  80 #endif /* HAVE_SIN_LEN */
  81   sin_dest.sin_addr = dest->prefix;
  82
  83   /* Make gateway. */
  84   if (gate)
  85     {
  86       memset (&sin_gate, 0, sizeof (struct sockaddr_in));
  87       sin_gate.sin_family = AF_INET;
  88 #ifdef HAVE_SIN_LEN
  89       sin_gate.sin_len = sizeof (struct sockaddr_in);
  90 #endif /* HAVE_SIN_LEN */
  91       sin_gate.sin_addr = *gate;
  92     }
  93
  94   memset (&sin_mask, 0, sizeof (struct sockaddr_in));
  95   sin_mask.sin_family = AF_INET;
  96 #ifdef HAVE_SIN_LEN
  97       sin_gate.sin_len = sizeof (struct sockaddr_in);
  98 #endif /* HAVE_SIN_LEN */
  99   masklen2ip (dest->prefixlen, &sin_mask.sin_addr);
 100
 101   /* Set destination address, mask and gateway.*/
 102   memcpy (&rtentry.rt_dst, &sin_dest, sizeof (struct sockaddr_in));
 103   if (gate)
 104     memcpy (&rtentry.rt_gateway, &sin_gate, sizeof (struct sockaddr_in));
 105 #ifndef SUNOS_5
 106   memcpy (&rtentry.rt_genmask, &sin_mask, sizeof (struct sockaddr_in));
 107 #endif /* SUNOS_5 */
 108
 109   /* Routing entry flag set. */
 110   if (dest->prefixlen == 32)
 111     rtentry.rt_flags |= RTF_HOST;
 112
 113   if (gate && gate->s_addr != INADDR_ANY)
 114     rtentry.rt_flags |= RTF_GATEWAY;
 115
 116   rtentry.rt_flags |= RTF_UP;
 117
 118   /* Additional flags */
 119   rtentry.rt_flags |= flags;
 120
 121
 122   /* For tagging route. */
 123   /* rtentry.rt_flags |= RTF_DYNAMIC; */
 124
 125   /* Open socket for ioctl. */
 126   sock = socket (AF_INET, SOCK_DGRAM, 0);
 127   if (sock < 0)
 128     {
 129       zlog_warn ("can't make socket\n");
 130       return -1;
 131     }
 132
 133   /* Send message by ioctl(). */
 134   ret = ioctl (sock, SIOCADDRT, &rtentry);
 135   if (ret < 0)
 136     {
 137       switch (errno)
 138         {
 139         case EEXIST:
 140           close (sock);
 141           return ZEBRA_ERR_RTEXIST;
 142           break;
 143         case ENETUNREACH:
 144           close (sock);
 145           return ZEBRA_ERR_RTUNREACH;
 146           break;
 147         case EPERM:
 148           close (sock);
 149           return ZEBRA_ERR_EPERM;
 150           break;
 151         }
 152
 153       close (sock);
 154       zlog_warn ("write : %s (%d)", safe_strerror (errno), errno);
 155       return 1;
 156     }
 157   close (sock);
 158
 159   return ret;
 160 }
 161
 162 /* Interface to ioctl route message. */
 163 int
 164 kernel_ioctl_ipv4 (u_long cmd, struct prefix *p, struct rib *rib, int family)
 165 {
 166   int ret;
 167   int sock;
 168   struct rtentry rtentry;
 169   struct sockaddr_in sin_dest, sin_mask, sin_gate;
 170   struct nexthop *nexthop;
 171   int nexthop_num = 0;
 172   struct interface *ifp;
 173
 174   memset (&rtentry, 0, sizeof (struct rtentry));
 175
 176   /* Make destination. */
 177   memset (&sin_dest, 0, sizeof (struct sockaddr_in));
 178   sin_dest.sin_family = AF_INET;
 179 #ifdef HAVE_SIN_LEN
 180   sin_dest.sin_len = sizeof (struct sockaddr_in);
 181 #endif /* HAVE_SIN_LEN */
 182   sin_dest.sin_addr = p->u.prefix4;
 183
 184   if (CHECK_FLAG (rib->flags, ZEBRA_FLAG_BLACKHOLE))
 185     {
 186       SET_FLAG (rtentry.rt_flags, RTF_REJECT);
 187
 188       if (cmd == SIOCADDRT)
 189         for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
 190           SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
 191
 192       goto skip;
 193     }
 194
 195   memset (&sin_gate, 0, sizeof (struct sockaddr_in));
 196
 197   /* Make gateway. */
 198   for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
 199     {
 200       if ((cmd == SIOCADDRT
 201            && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
 202           || (cmd == SIOCDELRT
 203               && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)))
 204         {
 205           if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
 206             {
 207               if (nexthop->rtype == NEXTHOP_TYPE_IPV4 ||
 208                   nexthop->rtype == NEXTHOP_TYPE_IPV4_IFINDEX)
 209                 {
 210                   sin_gate.sin_family = AF_INET;
 211 #ifdef HAVE_SIN_LEN
 212                   sin_gate.sin_len = sizeof (struct sockaddr_in);
 213 #endif /* HAVE_SIN_LEN */
 214                   sin_gate.sin_addr = nexthop->rgate.ipv4;
 215                   rtentry.rt_flags |= RTF_GATEWAY;
 216                 }
 217               if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX
 218                   || nexthop->rtype == NEXTHOP_TYPE_IFNAME)
 219                 {
 220                   ifp = if_lookup_by_index (nexthop->rifindex);
 221                   if (ifp)
 222                     rtentry.rt_dev = ifp->name;
 223                   else
 224                     return -1;
 225                 }
 226             }
 227           else
 228             {
 229               if (nexthop->type == NEXTHOP_TYPE_IPV4 ||
 230                   nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX)
 231                 {
 232                   sin_gate.sin_family = AF_INET;
 233 #ifdef HAVE_SIN_LEN
 234                   sin_gate.sin_len = sizeof (struct sockaddr_in);
 235 #endif /* HAVE_SIN_LEN */
 236                   sin_gate.sin_addr = nexthop->gate.ipv4;
 237                   rtentry.rt_flags |= RTF_GATEWAY;
 238                 }
 239               if (nexthop->type == NEXTHOP_TYPE_IFINDEX
 240                   || nexthop->type == NEXTHOP_TYPE_IFNAME)
 241                 {
 242                   ifp = if_lookup_by_index (nexthop->ifindex);
 243                   if (ifp)
 244                     rtentry.rt_dev = ifp->name;
 245                   else
 246                     return -1;
 247                 }
 248             }
 249
 250           if (cmd == SIOCADDRT)
 251             SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
 252
 253           nexthop_num++;
 254           break;
 255         }
 256     }
 257
 258   /* If there is no useful nexthop then return. */
 259   if (nexthop_num == 0)
 260     {
 261       if (IS_ZEBRA_DEBUG_KERNEL)
 262         zlog_info ("netlink_route_multipath(): No useful nexthop.");
 263       return 0;
 264     }
 265
 266  skip:
 267
 268   memset (&sin_mask, 0, sizeof (struct sockaddr_in));
 269   sin_mask.sin_family = AF_INET;
 270 #ifdef HAVE_SIN_LEN
 271   sin_mask.sin_len = sizeof (struct sockaddr_in);
 272 #endif /* HAVE_SIN_LEN */
 273   masklen2ip (p->prefixlen, &sin_mask.sin_addr);
 274
 275   /* Set destination address, mask and gateway.*/
 276   memcpy (&rtentry.rt_dst, &sin_dest, sizeof (struct sockaddr_in));
 277
 278   if (rtentry.rt_flags & RTF_GATEWAY)
 279     memcpy (&rtentry.rt_gateway, &sin_gate, sizeof (struct sockaddr_in));
 280
 281 #ifndef SUNOS_5
 282   memcpy (&rtentry.rt_genmask, &sin_mask, sizeof (struct sockaddr_in));
 283 #endif /* SUNOS_5 */
 284
 285   /* Metric.  It seems metric minus one value is installed... */
 286   rtentry.rt_metric = rib->metric;
 287
 288   /* Routing entry flag set. */
 289   if (p->prefixlen == 32)
 290     rtentry.rt_flags |= RTF_HOST;
 291
 292   rtentry.rt_flags |= RTF_UP;
 293
 294   /* Additional flags */
 295   /* rtentry.rt_flags |= flags; */
 296
 297   /* For tagging route. */
 298   /* rtentry.rt_flags |= RTF_DYNAMIC; */
 299
 300   /* Open socket for ioctl. */
 301   sock = socket (AF_INET, SOCK_DGRAM, 0);
 302   if (sock < 0)
 303     {
 304       zlog_warn ("can't make socket\n");
 305       return -1;
 306     }
 307
 308   /* Send message by ioctl(). */
 309   ret = ioctl (sock, cmd, &rtentry);
 310   if (ret < 0)
 311     {
 312       switch (errno)
 313         {
 314         case EEXIST:
 315           close (sock);
 316           return ZEBRA_ERR_RTEXIST;
 317           break;
 318         case ENETUNREACH:
 319           close (sock);
 320           return ZEBRA_ERR_RTUNREACH;
 321           break;
 322         case EPERM:
 323           close (sock);
 324           return ZEBRA_ERR_EPERM;
 325           break;
 326         }
 327
 328       close (sock);
 329       zlog_warn ("write : %s (%d)", safe_strerror (errno), errno);
 330       return ret;
 331     }
 332   close (sock);
 333
 334   return ret;
 335 }
 336
 337 int
 338 kernel_add_ipv4 (struct prefix *p, struct rib *rib)
 339 {
 340   return kernel_ioctl_ipv4 (SIOCADDRT, p, rib, AF_INET);
 341 }
 342
 343 int
 344 kernel_delete_ipv4 (struct prefix *p, struct rib *rib)
 345 {
 346   return kernel_ioctl_ipv4 (SIOCDELRT, p, rib, AF_INET);
 347 }
 348 \f
 349 #ifdef HAVE_IPV6
 350
 351 /* Below is hack for GNU libc definition and Linux 2.1.X header. */
 352 #undef RTF_DEFAULT
 353 #undef RTF_ADDRCONF
 354
 355 #include <asm/types.h>
 356
 357 #if defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1
 358 /* struct in6_rtmsg will be declared in net/route.h. */
 359 #else
 360 #include <linux/ipv6_route.h>
 361 #endif
 362
 363 int
 364 kernel_ioctl_ipv6 (u_long type, struct prefix_ipv6 *dest, struct in6_addr *gate,
 365                    int index, int flags)
 366 {
 367   int ret;
 368   int sock;
 369   struct in6_rtmsg rtm;
 370
 371   memset (&rtm, 0, sizeof (struct in6_rtmsg));
 372
 373   rtm.rtmsg_flags |= RTF_UP;
 374   rtm.rtmsg_metric = 1;
 375   memcpy (&rtm.rtmsg_dst, &dest->prefix, sizeof (struct in6_addr));
 376   rtm.rtmsg_dst_len = dest->prefixlen;
 377
 378   /* We need link local index. But this should be done caller...
 379   if (IN6_IS_ADDR_LINKLOCAL(&rtm.rtmsg_gateway))
 380     {
 381       index = if_index_address (&rtm.rtmsg_gateway);
 382       rtm.rtmsg_ifindex = index;
 383     }
 384   else
 385     rtm.rtmsg_ifindex = 0;
 386   */
 387
 388   rtm.rtmsg_flags |= RTF_GATEWAY;
 389
 390   /* For tagging route. */
 391   /* rtm.rtmsg_flags |= RTF_DYNAMIC; */
 392
 393   memcpy (&rtm.rtmsg_gateway, gate, sizeof (struct in6_addr));
 394
 395   if (index)
 396     rtm.rtmsg_ifindex = index;
 397   else
 398     rtm.rtmsg_ifindex = 0;
 399
 400   rtm.rtmsg_metric = 1;
 401
 402   sock = socket (AF_INET6, SOCK_DGRAM, 0);
 403   if (sock < 0)
 404     {
 405       zlog_warn ("can't make socket\n");
 406       return -1;
 407     }
 408
 409   /* Send message via ioctl. */
 410   ret = ioctl (sock, type, &rtm);
 411   if (ret < 0)
 412     {
 413       zlog_warn ("can't %s ipv6 route: %s\n", type == SIOCADDRT ? "add" : "delete",
 414            safe_strerror(errno));
 415       ret = errno;
 416       close (sock);
 417       return ret;
 418     }
 419   close (sock);
 420
 421   return ret;
 422 }
 423
 424 int
 425 kernel_ioctl_ipv6_multipath (u_long cmd, struct prefix *p, struct rib *rib,
 426                              int family)
 427 {
 428   int ret;
 429   int sock;
 430   struct in6_rtmsg rtm;
 431   struct nexthop *nexthop;
 432   int nexthop_num = 0;
 433
 434   memset (&rtm, 0, sizeof (struct in6_rtmsg));
 435
 436   rtm.rtmsg_flags |= RTF_UP;
 437   rtm.rtmsg_metric = rib->metric;
 438   memcpy (&rtm.rtmsg_dst, &p->u.prefix, sizeof (struct in6_addr));
 439   rtm.rtmsg_dst_len = p->prefixlen;
 440
 441   /* We need link local index. But this should be done caller...
 442   if (IN6_IS_ADDR_LINKLOCAL(&rtm.rtmsg_gateway))
 443     {
 444       index = if_index_address (&rtm.rtmsg_gateway);
 445       rtm.rtmsg_ifindex = index;
 446     }
 447   else
 448     rtm.rtmsg_ifindex = 0;
 449   */
 450
 451   rtm.rtmsg_flags |= RTF_GATEWAY;
 452
 453   /* For tagging route. */
 454   /* rtm.rtmsg_flags |= RTF_DYNAMIC; */
 455
 456   /* Make gateway. */
 457   for (nexthop = rib->nexthop; nexthop; nexthop = nexthop->next)
 458     {
 459       if ((cmd == SIOCADDRT
 460            && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_ACTIVE))
 461           || (cmd == SIOCDELRT
 462               && CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB)))
 463         {
 464           if (CHECK_FLAG (nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
 465             {
 466               if (nexthop->rtype == NEXTHOP_TYPE_IPV6
 467                   || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME
 468                   || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX)
 469                 {
 470                   memcpy (&rtm.rtmsg_gateway, &nexthop->rgate.ipv6,
 471                           sizeof (struct in6_addr));
 472                 }
 473               if (nexthop->rtype == NEXTHOP_TYPE_IFINDEX
 474                   || nexthop->rtype == NEXTHOP_TYPE_IFNAME
 475                   || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFNAME
 476                   || nexthop->rtype == NEXTHOP_TYPE_IPV6_IFINDEX)
 477                 rtm.rtmsg_ifindex = nexthop->rifindex;
 478               else
 479                 rtm.rtmsg_ifindex = 0;
 480
 481             }
 482           else
 483             {
 484               if (nexthop->type == NEXTHOP_TYPE_IPV6
 485                   || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME
 486                   || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
 487                 {
 488                   memcpy (&rtm.rtmsg_gateway, &nexthop->gate.ipv6,
 489                           sizeof (struct in6_addr));
 490                 }
 491               if (nexthop->type == NEXTHOP_TYPE_IFINDEX
 492                   || nexthop->type == NEXTHOP_TYPE_IFNAME
 493                   || nexthop->type == NEXTHOP_TYPE_IPV6_IFNAME
 494                   || nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)
 495                 rtm.rtmsg_ifindex = nexthop->ifindex;
 496               else
 497                 rtm.rtmsg_ifindex = 0;
 498             }
 499
 500           if (cmd == SIOCADDRT)
 501             SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
 502
 503           nexthop_num++;
 504           break;
 505         }
 506     }
 507
 508   /* If there is no useful nexthop then return. */
 509   if (nexthop_num == 0)
 510     {
 511       if (IS_ZEBRA_DEBUG_KERNEL)
 512         zlog_info ("netlink_route_multipath(): No useful nexthop.");
 513       return 0;
 514     }
 515
 516   sock = socket (AF_INET6, SOCK_DGRAM, 0);
 517   if (sock < 0)
 518     {
 519       zlog_warn ("can't make socket\n");
 520       return -1;
 521     }
 522
 523   /* Send message via ioctl. */
 524   ret = ioctl (sock, cmd, &rtm);
 525   if (ret < 0)
 526     {
 527       zlog_warn ("can't %s ipv6 route: %s\n",
 528                  cmd == SIOCADDRT ? "add" : "delete",
 529            safe_strerror(errno));
 530       ret = errno;
 531       close (sock);
 532       return ret;
 533     }
 534   close (sock);
 535
 536   return ret;
 537 }
 538
 539 int
 540 kernel_add_ipv6 (struct prefix *p, struct rib *rib)
 541 {
 542   return kernel_ioctl_ipv6_multipath (SIOCADDRT, p, rib, AF_INET6);
 543 }
 544
 545 int
 546 kernel_delete_ipv6 (struct prefix *p, struct rib *rib)
 547 {
 548   return kernel_ioctl_ipv6_multipath (SIOCDELRT, p, rib, AF_INET6);
 549 }
 550
 551 /* Delete IPv6 route from the kernel. */
 552 int
 553 kernel_delete_ipv6_old (struct prefix_ipv6 *dest, struct in6_addr *gate,
 554                     int index, int flags, int table)
 555 {
 556   return kernel_ioctl_ipv6 (SIOCDELRT, dest, gate, index, flags);
 557 }
 558 #endif /* HAVE_IPV6 */