zebra/router-id.c

   1 /*
   2  * Router ID for zebra daemon.
   3  *
   4  * Copyright (C) 2004 James R. Leu
   5  *
   6  * This file is part of Quagga routing suite.
   7  *
   8  * Quagga is free software; you can redistribute it and/or modify it
   9  * under the terms of the GNU General Public License as published by the
  10  * Free Software Foundation; either version 2, or (at your option) any
  11  * later version.
  12  *
  13  * Quagga is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
  20  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  21  * 02111-1307, USA.
  22  */
  23
  24 #include <zebra.h>
  25
  26 #include "if.h"
  27 #include "vty.h"
  28 #include "sockunion.h"
  29 #include "prefix.h"
  30 #include "stream.h"
  31 #include "command.h"
  32 #include "memory.h"
  33 #include "ioctl.h"
  34 #include "connected.h"
  35 #include "network.h"
  36 #include "log.h"
  37 #include "table.h"
  38 #include "rib.h"
  39 #include "vrf.h"
  40
  41 #include "zebra/zserv.h"
  42 #include "zebra/zebra_vrf.h"
  43 #include "zebra/router-id.h"
  44 #include "zebra/redistribute.h"
  45
  46 static struct connected *
  47 router_id_find_node (struct list *l, struct connected *ifc)
  48 {
  49   struct listnode *node;
  50   struct connected *c;
  51
  52   for (ALL_LIST_ELEMENTS_RO (l, node, c))
  53     if (prefix_same (ifc->address, c->address))
  54       return c;
  55
  56   return NULL;
  57 }
  58
  59 static int
  60 router_id_bad_address (struct connected *ifc)
  61 {
  62   if (ifc->address->family != AF_INET)
  63     return 1;
  64
  65   /* non-redistributable addresses shouldn't be used for RIDs either */
  66   if (!zebra_check_addr (ifc->address))
  67     return 1;
  68
  69   return 0;
  70 }
  71
  72 void
  73 router_id_get (struct prefix *p, vrf_id_t vrf_id)
  74 {
  75   struct listnode *node;
  76   struct connected *c;
  77   struct zebra_vrf *zvrf = vrf_info_get (vrf_id);
  78
  79   p->u.prefix4.s_addr = 0;
  80   p->family = AF_INET;
  81   p->prefixlen = 32;
  82
  83   if (zvrf->rid_user_assigned.u.prefix4.s_addr)
  84     p->u.prefix4.s_addr = zvrf->rid_user_assigned.u.prefix4.s_addr;
  85   else if (!list_isempty (zvrf->rid_lo_sorted_list))
  86     {
  87       node = listtail (zvrf->rid_lo_sorted_list);
  88       c = listgetdata (node);
  89       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  90     }
  91   else if (!list_isempty (zvrf->rid_all_sorted_list))
  92     {
  93       node = listtail (zvrf->rid_all_sorted_list);
  94       c = listgetdata (node);
  95       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  96     }
  97 }
  98
  99 static void
 100 router_id_set (struct prefix *p, vrf_id_t vrf_id)
 101 {
 102   struct prefix p2;
 103   struct listnode *node;
 104   struct zserv *client;
 105   struct zebra_vrf *zvrf;
 106
 107   if (p->u.prefix4.s_addr == 0) /* unset */
 108     {
 109       zvrf = vrf_info_lookup (vrf_id);
 110       if (! zvrf)
 111         return;
 112     }
 113   else /* set */
 114     zvrf = vrf_info_get (vrf_id);
 115
 116   zvrf->rid_user_assigned.u.prefix4.s_addr = p->u.prefix4.s_addr;
 117
 118   router_id_get (&p2, vrf_id);
 119
 120   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 121     zsend_router_id_update (client, &p2, vrf_id);
 122 }
 123
 124 void
 125 router_id_add_address (struct connected *ifc)
 126 {
 127   struct list *l = NULL;
 128   struct listnode *node;
 129   struct prefix before;
 130   struct prefix after;
 131   struct zserv *client;
 132   struct zebra_vrf *zvrf = vrf_info_get (ifc->ifp->vrf_id);
 133
 134   if (router_id_bad_address (ifc))
 135     return;
 136
 137   router_id_get (&before, zvrf->vrf_id);
 138
 139   if (!strncmp (ifc->ifp->name, "lo", 2)
 140       || !strncmp (ifc->ifp->name, "dummy", 5))
 141     l = zvrf->rid_lo_sorted_list;
 142   else
 143     l = zvrf->rid_all_sorted_list;
 144
 145   if (!router_id_find_node (l, ifc))
 146     listnode_add_sort (l, ifc);
 147
 148   router_id_get (&after, zvrf->vrf_id);
 149
 150   if (prefix_same (&before, &after))
 151     return;
 152
 153   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 154     zsend_router_id_update (client, &after, zvrf->vrf_id);
 155 }
 156
 157 void
 158 router_id_del_address (struct connected *ifc)
 159 {
 160   struct connected *c;
 161   struct list *l;
 162   struct prefix after;
 163   struct prefix before;
 164   struct listnode *node;
 165   struct zserv *client;
 166   struct zebra_vrf *zvrf = vrf_info_get (ifc->ifp->vrf_id);
 167
 168   if (router_id_bad_address (ifc))
 169     return;
 170
 171   router_id_get (&before, zvrf->vrf_id);
 172
 173   if (!strncmp (ifc->ifp->name, "lo", 2)
 174       || !strncmp (ifc->ifp->name, "dummy", 5))
 175     l = zvrf->rid_lo_sorted_list;
 176   else
 177     l = zvrf->rid_all_sorted_list;
 178
 179   if ((c = router_id_find_node (l, ifc)))
 180     listnode_delete (l, c);
 181
 182   router_id_get (&after, zvrf->vrf_id);
 183
 184   if (prefix_same (&before, &after))
 185     return;
 186
 187   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 188     zsend_router_id_update (client, &after, zvrf->vrf_id);
 189 }
 190
 191 void
 192 router_id_write (struct vty *vty)
 193 {
 194   struct zebra_vrf *zvrf;
 195   vrf_iter_t iter;
 196
 197   for (iter = vrf_first (); iter != VRF_ITER_INVALID; iter = vrf_next (iter))
 198     if ((zvrf = vrf_iter2info (iter)) != NULL)
 199       if (zvrf->rid_user_assigned.u.prefix4.s_addr)
 200         {
 201           if (zvrf->vrf_id == VRF_DEFAULT)
 202             vty_out (vty, "router-id %s%s",
 203                      inet_ntoa (zvrf->rid_user_assigned.u.prefix4),
 204                      VTY_NEWLINE);
 205           else
 206             vty_out (vty, "router-id %s vrf %s%s",
 207                      inet_ntoa (zvrf->rid_user_assigned.u.prefix4),
 208                      zvrf->name,
 209                      VTY_NEWLINE);
 210         }
 211 }
 212
 213 DEFUN (router_id,
 214        router_id_cmd,
 215        "router-id A.B.C.D",
 216        "Manually set the router-id\n"
 217        "IP address to use for router-id\n")
 218 {
 219   struct prefix rid;
 220   vrf_id_t vrf_id = VRF_DEFAULT;
 221
 222   rid.u.prefix4.s_addr = inet_addr (argv[0]);
 223   if (!rid.u.prefix4.s_addr)
 224     return CMD_WARNING;
 225
 226   rid.prefixlen = 32;
 227   rid.family = AF_INET;
 228
 229   if (argc > 1)
 230     VRF_GET_ID (vrf_id, argv[1]);
 231
 232   router_id_set (&rid, vrf_id);
 233
 234   return CMD_SUCCESS;
 235 }
 236
 237 ALIAS (router_id,
 238        router_id_vrf_cmd,
 239        "router-id A.B.C.D " VRF_CMD_STR,
 240        "Manually set the router-id\n"
 241        "IP address to use for router-id\n"
 242        VRF_CMD_HELP_STR)
 243
 244 DEFUN (no_router_id,
 245        no_router_id_cmd,
 246        "no router-id",
 247        NO_STR
 248        "Remove the manually configured router-id\n")
 249 {
 250   struct prefix rid;
 251   vrf_id_t vrf_id = VRF_DEFAULT;
 252
 253   rid.u.prefix4.s_addr = 0;
 254   rid.prefixlen = 0;
 255   rid.family = AF_INET;
 256
 257   if (argc > 1)
 258     VRF_GET_ID (vrf_id, argv[1]);
 259
 260   router_id_set (&rid, vrf_id);
 261
 262   return CMD_SUCCESS;
 263 }
 264
 265 ALIAS (no_router_id,
 266        no_router_id_val_cmd,
 267        "no router-id A.B.C.D",
 268        NO_STR
 269        "Remove the manually configured router-id\n"
 270        "IP address to use for router-id\n")
 271
 272 ALIAS (no_router_id,
 273        no_router_id_vrf_cmd,
 274        "no router-id A.B.C.D " VRF_CMD_STR,
 275        NO_STR
 276        "Remove the manually configured router-id\n"
 277        "IP address to use for router-id\n"
 278        VRF_CMD_HELP_STR)
 279
 280 static int
 281 router_id_cmp (void *a, void *b)
 282 {
 283   const struct connected *ifa = (const struct connected *)a;
 284   const struct connected *ifb = (const struct connected *)b;
 285
 286   return IPV4_ADDR_CMP(&ifa->address->u.prefix4.s_addr,&ifb->address->u.prefix4.s_addr);
 287 }
 288
 289 void
 290 router_id_cmd_init (void)
 291 {
 292   install_element (CONFIG_NODE, &router_id_cmd);
 293   install_element (CONFIG_NODE, &no_router_id_cmd);
 294   install_element (CONFIG_NODE, &router_id_vrf_cmd);
 295   install_element (CONFIG_NODE, &no_router_id_val_cmd);
 296   install_element (CONFIG_NODE, &no_router_id_vrf_cmd);
 297 }
 298
 299 void
 300 router_id_init (struct zebra_vrf *zvrf)
 301 {
 302   zvrf->rid_all_sorted_list = &zvrf->_rid_all_sorted_list;
 303   zvrf->rid_lo_sorted_list = &zvrf->_rid_lo_sorted_list;
 304
 305   memset (zvrf->rid_all_sorted_list, 0, sizeof (zvrf->_rid_all_sorted_list));
 306   memset (zvrf->rid_lo_sorted_list, 0, sizeof (zvrf->_rid_lo_sorted_list));
 307   memset (&zvrf->rid_user_assigned, 0, sizeof (zvrf->rid_user_assigned));
 308
 309   zvrf->rid_all_sorted_list->cmp = router_id_cmp;
 310   zvrf->rid_lo_sorted_list->cmp = router_id_cmp;
 311
 312   zvrf->rid_user_assigned.family = AF_INET;
 313   zvrf->rid_user_assigned.prefixlen = 32;
 314 }