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
  40 #include "zebra/zserv.h"
  41
  42 static struct list rid_all_sorted_list;
  43 static struct list rid_lo_sorted_list;
  44 static struct prefix rid_user_assigned;
  45
  46 /* master zebra server structure */
  47 extern struct zebra_t zebrad;
  48
  49 static struct connected *
  50 router_id_find_node (struct list *l, struct connected *ifc)
  51 {
  52   struct listnode *node;
  53   struct connected *c;
  54
  55   for (ALL_LIST_ELEMENTS_RO (l, node, c))
  56     if (prefix_same (ifc->address, c->address))
  57       return c;
  58
  59   return NULL;
  60 }
  61
  62 static int
  63 router_id_bad_address (struct connected *ifc)
  64 {
  65   struct prefix n;
  66
  67   if (ifc->address->family != AF_INET)
  68     return 1;
  69
  70   n.u.prefix4.s_addr = htonl (INADDR_LOOPBACK);
  71   n.prefixlen = 8;
  72   n.family = AF_INET;
  73
  74   if (prefix_match (&n, ifc->address))
  75     return 1;
  76
  77   return 0;
  78 }
  79
  80 void
  81 router_id_get (struct prefix *p)
  82 {
  83   struct listnode *node;
  84   struct connected *c;
  85
  86   p->u.prefix4.s_addr = 0;
  87   p->family = AF_INET;
  88   p->prefixlen = 32;
  89
  90   if (rid_user_assigned.u.prefix4.s_addr)
  91     p->u.prefix4.s_addr = rid_user_assigned.u.prefix4.s_addr;
  92   else if (!list_isempty (&rid_lo_sorted_list))
  93     {
  94       node = listtail (&rid_lo_sorted_list);
  95       c = listgetdata (node);
  96       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  97     }
  98   else if (!list_isempty (&rid_all_sorted_list))
  99     {
 100       node = listtail (&rid_all_sorted_list);
 101       c = listgetdata (node);
 102       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
 103     }
 104 }
 105
 106 static void
 107 router_id_set (struct prefix *p)
 108 {
 109   struct prefix p2;
 110   struct listnode *node;
 111   struct zserv *client;
 112
 113   rid_user_assigned.u.prefix4.s_addr = p->u.prefix4.s_addr;
 114
 115   router_id_get (&p2);
 116
 117   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 118     zsend_router_id_update (client, &p2);
 119 }
 120
 121 void
 122 router_id_add_address (struct connected *ifc)
 123 {
 124   struct list *l = NULL;
 125   struct listnode *node;
 126   struct prefix before;
 127   struct prefix after;
 128   struct zserv *client;
 129
 130   if (router_id_bad_address (ifc))
 131     return;
 132
 133   router_id_get (&before);
 134
 135   if (!strncmp (ifc->ifp->name, "lo", 2)
 136       || !strncmp (ifc->ifp->name, "dummy", 5))
 137     l = &rid_lo_sorted_list;
 138   else
 139     l = &rid_all_sorted_list;
 140
 141   if (!router_id_find_node (l, ifc))
 142     listnode_add (l, ifc);
 143
 144   router_id_get (&after);
 145
 146   if (prefix_same (&before, &after))
 147     return;
 148
 149   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 150     zsend_router_id_update (client, &after);
 151 }
 152
 153 void
 154 router_id_del_address (struct connected *ifc)
 155 {
 156   struct connected *c;
 157   struct list *l;
 158   struct prefix after;
 159   struct prefix before;
 160   struct listnode *node;
 161   struct zserv *client;
 162
 163   if (router_id_bad_address (ifc))
 164     return;
 165
 166   router_id_get (&before);
 167
 168   if (!strncmp (ifc->ifp->name, "lo", 2)
 169       || !strncmp (ifc->ifp->name, "dummy", 5))
 170     l = &rid_lo_sorted_list;
 171   else
 172     l = &rid_all_sorted_list;
 173
 174   if ((c = router_id_find_node (l, ifc)))
 175     listnode_delete (l, c);
 176
 177   router_id_get (&after);
 178
 179   if (prefix_same (&before, &after))
 180     return;
 181
 182   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 183     zsend_router_id_update (client, &after);
 184 }
 185
 186 void
 187 router_id_write (struct vty *vty)
 188 {
 189   if (rid_user_assigned.u.prefix4.s_addr)
 190     vty_out (vty, "router-id %s%s", inet_ntoa (rid_user_assigned.u.prefix4),
 191              VTY_NEWLINE);
 192 }
 193
 194 DEFUN (router_id,
 195        router_id_cmd,
 196        "router-id A.B.C.D",
 197        "Manually set the router-id\n"
 198        "IP address to use for router-id\n")
 199 {
 200   struct prefix rid;
 201
 202   rid.u.prefix4.s_addr = inet_addr (argv[0]);
 203   if (!rid.u.prefix4.s_addr)
 204     return CMD_WARNING;
 205
 206   rid.prefixlen = 32;
 207   rid.family = AF_INET;
 208
 209   router_id_set (&rid);
 210
 211   return CMD_SUCCESS;
 212 }
 213
 214 DEFUN (no_router_id,
 215        no_router_id_cmd,
 216        "no router-id",
 217        NO_STR
 218        "Remove the manually configured router-id\n")
 219 {
 220   struct prefix rid;
 221
 222   rid.u.prefix4.s_addr = 0;
 223   rid.prefixlen = 0;
 224   rid.family = AF_INET;
 225
 226   router_id_set (&rid);
 227
 228   return CMD_SUCCESS;
 229 }
 230
 231 int
 232 router_id_cmp (void *a, void *b)
 233 {
 234   unsigned int A, B;
 235
 236   A = ((struct connected *) a)->address->u.prefix4.s_addr;
 237   B = ((struct connected *) b)->address->u.prefix4.s_addr;
 238
 239   if (A > B)
 240     return 1;
 241   else if (A < B)
 242     return -1;
 243   return 0;
 244 }
 245
 246 void
 247 router_id_init (void)
 248 {
 249   install_element (CONFIG_NODE, &router_id_cmd);
 250   install_element (CONFIG_NODE, &no_router_id_cmd);
 251
 252   memset (&rid_all_sorted_list, 0, sizeof (rid_all_sorted_list));
 253   memset (&rid_lo_sorted_list, 0, sizeof (rid_lo_sorted_list));
 254   memset (&rid_user_assigned, 0, sizeof (rid_user_assigned));
 255
 256   rid_all_sorted_list.cmp = router_id_cmp;
 257   rid_lo_sorted_list.cmp = router_id_cmp;
 258
 259   rid_user_assigned.family = AF_INET;
 260   rid_user_assigned.prefixlen = 32;
 261 }