zebra/redistribute.c

   1 /* Redistribution Handler
   2  * Copyright (C) 1998 Kunihiro Ishiguro
   3  *
   4  * This file is part of GNU Zebra.
   5  *
   6  * GNU Zebra is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation; either version 2, or (at your option) any
   9  * later version.
  10  *
  11  * GNU Zebra is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  18  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19  * 02111-1307, USA.
  20  */
  21
  22 #include <zebra.h>
  23
  24 #include "vector.h"
  25 #include "vty.h"
  26 #include "command.h"
  27 #include "prefix.h"
  28 #include "table.h"
  29 #include "stream.h"
  30 #include "zclient.h"
  31 #include "linklist.h"
  32 #include "log.h"
  33
  34 #include "zebra/rib.h"
  35 #include "zebra/zserv.h"
  36 #include "zebra/redistribute.h"
  37 #include "zebra/debug.h"
  38 #include "zebra/router-id.h"
  39
  40 /* master zebra server structure */
  41 extern struct zebra_t zebrad;
  42
  43 int
  44 zebra_check_addr (struct prefix *p)
  45 {
  46   if (p->family == AF_INET)
  47     {
  48       u_int32_t addr;
  49
  50       addr = p->u.prefix4.s_addr;
  51       addr = ntohl (addr);
  52
  53       if (IPV4_NET127 (addr)
  54           || IN_CLASSD (addr)
  55           || IPV4_LINKLOCAL(addr))
  56         return 0;
  57     }
  58 #ifdef HAVE_IPV6
  59   if (p->family == AF_INET6)
  60     {
  61       if (IN6_IS_ADDR_LOOPBACK (&p->u.prefix6))
  62         return 0;
  63       if (IN6_IS_ADDR_LINKLOCAL(&p->u.prefix6))
  64         return 0;
  65     }
  66 #endif /* HAVE_IPV6 */
  67   return 1;
  68 }
  69
  70 static int
  71 is_default (struct prefix *p)
  72 {
  73   if (p->family == AF_INET)
  74     if (p->u.prefix4.s_addr == 0 && p->prefixlen == 0)
  75       return 1;
  76 #ifdef HAVE_IPV6
  77 #if 0  /* IPv6 default separation is now pending until protocol daemon
  78           can handle that. */
  79   if (p->family == AF_INET6)
  80     if (IN6_IS_ADDR_UNSPECIFIED (&p->u.prefix6) && p->prefixlen == 0)
  81       return 1;
  82 #endif /* 0 */
  83 #endif /* HAVE_IPV6 */
  84   return 0;
  85 }
  86
  87 static void
  88 zebra_redistribute_default (struct zserv *client)
  89 {
  90   struct prefix_ipv4 p;
  91   struct route_table *table;
  92   struct route_node *rn;
  93   struct rib *newrib;
  94 #ifdef HAVE_IPV6
  95   struct prefix_ipv6 p6;
  96 #endif /* HAVE_IPV6 */
  97
  98
  99   /* Lookup default route. */
 100   memset (&p, 0, sizeof (struct prefix_ipv4));
 101   p.family = AF_INET;
 102
 103   /* Lookup table.  */
 104   table = vrf_table (AFI_IP, SAFI_UNICAST, 0);
 105   if (table)
 106     {
 107       rn = route_node_lookup (table, (struct prefix *)&p);
 108       if (rn)
 109         {
 110           RNODE_FOREACH_RIB (rn, newrib)
 111             if (CHECK_FLAG (newrib->flags, ZEBRA_FLAG_SELECTED)
 112                 && newrib->distance != DISTANCE_INFINITY)
 113               zsend_route_multipath (ZEBRA_IPV4_ROUTE_ADD, client, &rn->p, newrib);
 114           route_unlock_node (rn);
 115         }
 116     }
 117
 118 #ifdef HAVE_IPV6
 119   /* Lookup default route. */
 120   memset (&p6, 0, sizeof (struct prefix_ipv6));
 121   p6.family = AF_INET6;
 122
 123   /* Lookup table.  */
 124   table = vrf_table (AFI_IP6, SAFI_UNICAST, 0);
 125   if (table)
 126     {
 127       rn = route_node_lookup (table, (struct prefix *)&p6);
 128       if (rn)
 129         {
 130           RNODE_FOREACH_RIB (rn, newrib)
 131             if (CHECK_FLAG (newrib->flags, ZEBRA_FLAG_SELECTED)
 132                 && newrib->distance != DISTANCE_INFINITY)
 133               zsend_route_multipath (ZEBRA_IPV6_ROUTE_ADD, client, &rn->p, newrib);
 134           route_unlock_node (rn);
 135         }
 136     }
 137 #endif /* HAVE_IPV6 */
 138 }
 139
 140 /* Redistribute routes. */
 141 static void
 142 zebra_redistribute (struct zserv *client, int type)
 143 {
 144   struct rib *newrib;
 145   struct route_table *table;
 146   struct route_node *rn;
 147
 148   table = vrf_table (AFI_IP, SAFI_UNICAST, 0);
 149   if (table)
 150     for (rn = route_top (table); rn; rn = route_next (rn))
 151       RNODE_FOREACH_RIB (rn, newrib)
 152         if (CHECK_FLAG (newrib->flags, ZEBRA_FLAG_SELECTED)
 153             && newrib->type == type
 154             && newrib->distance != DISTANCE_INFINITY
 155             && zebra_check_addr (&rn->p))
 156           zsend_route_multipath (ZEBRA_IPV4_ROUTE_ADD, client, &rn->p, newrib);
 157
 158 #ifdef HAVE_IPV6
 159   table = vrf_table (AFI_IP6, SAFI_UNICAST, 0);
 160   if (table)
 161     for (rn = route_top (table); rn; rn = route_next (rn))
 162       RNODE_FOREACH_RIB (rn, newrib)
 163         if (CHECK_FLAG (newrib->flags, ZEBRA_FLAG_SELECTED)
 164             && newrib->type == type
 165             && newrib->distance != DISTANCE_INFINITY
 166             && zebra_check_addr (&rn->p))
 167           zsend_route_multipath (ZEBRA_IPV6_ROUTE_ADD, client, &rn->p, newrib);
 168 #endif /* HAVE_IPV6 */
 169 }
 170
 171 void
 172 redistribute_add (struct prefix *p, struct rib *rib)
 173 {
 174   struct listnode *node, *nnode;
 175   struct zserv *client;
 176
 177   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 178     {
 179       if (is_default (p))
 180         {
 181           if (client->redist_default || client->redist[rib->type])
 182             {
 183               if (p->family == AF_INET)
 184                 zsend_route_multipath (ZEBRA_IPV4_ROUTE_ADD, client, p, rib);
 185 #ifdef HAVE_IPV6
 186               if (p->family == AF_INET6)
 187                 zsend_route_multipath (ZEBRA_IPV6_ROUTE_ADD, client, p, rib);
 188 #endif /* HAVE_IPV6 */
 189             }
 190         }
 191       else if (client->redist[rib->type])
 192         {
 193           if (p->family == AF_INET)
 194             zsend_route_multipath (ZEBRA_IPV4_ROUTE_ADD, client, p, rib);
 195 #ifdef HAVE_IPV6
 196           if (p->family == AF_INET6)
 197             zsend_route_multipath (ZEBRA_IPV6_ROUTE_ADD, client, p, rib);
 198 #endif /* HAVE_IPV6 */
 199         }
 200     }
 201 }
 202
 203 void
 204 redistribute_delete (struct prefix *p, struct rib *rib)
 205 {
 206   struct listnode *node, *nnode;
 207   struct zserv *client;
 208
 209   /* Add DISTANCE_INFINITY check. */
 210   if (rib->distance == DISTANCE_INFINITY)
 211     return;
 212
 213   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 214     {
 215       if (is_default (p))
 216         {
 217           if (client->redist_default || client->redist[rib->type])
 218             {
 219               if (p->family == AF_INET)
 220                 zsend_route_multipath (ZEBRA_IPV4_ROUTE_DELETE, client, p,
 221                                        rib);
 222 #ifdef HAVE_IPV6
 223               if (p->family == AF_INET6)
 224                 zsend_route_multipath (ZEBRA_IPV6_ROUTE_DELETE, client, p,
 225                                        rib);
 226 #endif /* HAVE_IPV6 */
 227             }
 228         }
 229       else if (client->redist[rib->type])
 230         {
 231           if (p->family == AF_INET)
 232             zsend_route_multipath (ZEBRA_IPV4_ROUTE_DELETE, client, p, rib);
 233 #ifdef HAVE_IPV6
 234           if (p->family == AF_INET6)
 235             zsend_route_multipath (ZEBRA_IPV6_ROUTE_DELETE, client, p, rib);
 236 #endif /* HAVE_IPV6 */
 237         }
 238     }
 239 }
 240
 241 void
 242 zebra_redistribute_add (int command, struct zserv *client, int length)
 243 {
 244   int type;
 245
 246   type = stream_getc (client->ibuf);
 247
 248   if (type == 0 || type >= ZEBRA_ROUTE_MAX)
 249     return;
 250
 251   if (! client->redist[type])
 252     {
 253       client->redist[type] = 1;
 254       zebra_redistribute (client, type);
 255     }
 256 }
 257
 258 void
 259 zebra_redistribute_delete (int command, struct zserv *client, int length)
 260 {
 261   int type;
 262
 263   type = stream_getc (client->ibuf);
 264
 265   if (type == 0 || type >= ZEBRA_ROUTE_MAX)
 266     return;
 267
 268   client->redist[type] = 0;
 269 }
 270
 271 void
 272 zebra_redistribute_default_add (int command, struct zserv *client, int length)
 273 {
 274   client->redist_default = 1;
 275   zebra_redistribute_default (client);
 276 }
 277
 278 void
 279 zebra_redistribute_default_delete (int command, struct zserv *client,
 280                                    int length)
 281 {
 282   client->redist_default = 0;;
 283 }
 284
 285 /* Interface up information. */
 286 void
 287 zebra_interface_up_update (struct interface *ifp)
 288 {
 289   struct listnode *node, *nnode;
 290   struct zserv *client;
 291
 292   if (IS_ZEBRA_DEBUG_EVENT)
 293     zlog_debug ("MESSAGE: ZEBRA_INTERFACE_UP %s", ifp->name);
 294
 295   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 296     zsend_interface_update (ZEBRA_INTERFACE_UP, client, ifp);
 297 }
 298
 299 /* Interface down information. */
 300 void
 301 zebra_interface_down_update (struct interface *ifp)
 302 {
 303   struct listnode *node, *nnode;
 304   struct zserv *client;
 305
 306   if (IS_ZEBRA_DEBUG_EVENT)
 307     zlog_debug ("MESSAGE: ZEBRA_INTERFACE_DOWN %s", ifp->name);
 308
 309   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 310     zsend_interface_update (ZEBRA_INTERFACE_DOWN, client, ifp);
 311 }
 312
 313 /* Interface information update. */
 314 void
 315 zebra_interface_add_update (struct interface *ifp)
 316 {
 317   struct listnode *node, *nnode;
 318   struct zserv *client;
 319
 320   if (IS_ZEBRA_DEBUG_EVENT)
 321     zlog_debug ("MESSAGE: ZEBRA_INTERFACE_ADD %s", ifp->name);
 322
 323   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 324     if (client->ifinfo)
 325       zsend_interface_add (client, ifp);
 326 }
 327
 328 void
 329 zebra_interface_delete_update (struct interface *ifp)
 330 {
 331   struct listnode *node, *nnode;
 332   struct zserv *client;
 333
 334   if (IS_ZEBRA_DEBUG_EVENT)
 335     zlog_debug ("MESSAGE: ZEBRA_INTERFACE_DELETE %s", ifp->name);
 336
 337   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 338     if (client->ifinfo)
 339       zsend_interface_delete (client, ifp);
 340 }
 341
 342 /* Interface address addition. */
 343 void
 344 zebra_interface_address_add_update (struct interface *ifp,
 345                                     struct connected *ifc)
 346 {
 347   struct listnode *node, *nnode;
 348   struct zserv *client;
 349   struct prefix *p;
 350
 351   if (IS_ZEBRA_DEBUG_EVENT)
 352     {
 353       char buf[INET6_ADDRSTRLEN];
 354
 355       p = ifc->address;
 356       zlog_debug ("MESSAGE: ZEBRA_INTERFACE_ADDRESS_ADD %s/%d on %s",
 357                   inet_ntop (p->family, &p->u.prefix, buf, INET6_ADDRSTRLEN),
 358                   p->prefixlen, ifc->ifp->name);
 359     }
 360
 361   if (!CHECK_FLAG(ifc->conf, ZEBRA_IFC_REAL))
 362     zlog_warn("WARNING: advertising address to clients that is not yet usable.");
 363
 364   router_id_add_address(ifc);
 365
 366   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 367     if (client->ifinfo && CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 368       zsend_interface_address (ZEBRA_INTERFACE_ADDRESS_ADD, client, ifp, ifc);
 369 }
 370
 371 /* Interface address deletion. */
 372 void
 373 zebra_interface_address_delete_update (struct interface *ifp,
 374                                        struct connected *ifc)
 375 {
 376   struct listnode *node, *nnode;
 377   struct zserv *client;
 378   struct prefix *p;
 379
 380   if (IS_ZEBRA_DEBUG_EVENT)
 381     {
 382       char buf[INET6_ADDRSTRLEN];
 383
 384       p = ifc->address;
 385       zlog_debug ("MESSAGE: ZEBRA_INTERFACE_ADDRESS_DELETE %s/%d on %s",
 386                   inet_ntop (p->family, &p->u.prefix, buf, INET6_ADDRSTRLEN),
 387                  p->prefixlen, ifc->ifp->name);
 388     }
 389
 390   router_id_del_address(ifc);
 391
 392   for (ALL_LIST_ELEMENTS (zebrad.client_list, node, nnode, client))
 393     if (client->ifinfo && CHECK_FLAG (ifc->conf, ZEBRA_IFC_REAL))
 394       zsend_interface_address (ZEBRA_INTERFACE_ADDRESS_DELETE, client, ifp, ifc);
 395 }