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 #include "zebra/router-id.h"
  42
  43 static struct list rid_all_sorted_list;
  44 static struct list rid_lo_sorted_list;
  45 static struct prefix rid_user_assigned;
  46
  47 /* master zebra server structure */
  48 extern struct zebra_t zebrad;
  49
  50 static struct connected *
  51 router_id_find_node (struct list *l, struct connected *ifc)
  52 {
  53   struct listnode *node;
  54   struct connected *c;
  55
  56   for (ALL_LIST_ELEMENTS_RO (l, node, c))
  57     if (prefix_same (ifc->address, c->address))
  58       return c;
  59
  60   return NULL;
  61 }
  62
  63 static int
  64 router_id_bad_address (struct connected *ifc)
  65 {
  66   struct prefix n;
  67
  68   if (ifc->address->family != AF_INET)
  69     return 1;
  70
  71   n.u.prefix4.s_addr = htonl (INADDR_LOOPBACK);
  72   n.prefixlen = 8;
  73   n.family = AF_INET;
  74
  75   if (prefix_match (&n, ifc->address))
  76     return 1;
  77
  78   return 0;
  79 }
  80
  81 void
  82 router_id_get (struct prefix *p)
  83 {
  84   struct listnode *node;
  85   struct connected *c;
  86
  87   p->u.prefix4.s_addr = 0;
  88   p->family = AF_INET;
  89   p->prefixlen = 32;
  90
  91   if (rid_user_assigned.u.prefix4.s_addr)
  92     p->u.prefix4.s_addr = rid_user_assigned.u.prefix4.s_addr;
  93   else if (!list_isempty (&rid_lo_sorted_list))
  94     {
  95       node = listtail (&rid_lo_sorted_list);
  96       c = listgetdata (node);
  97       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  98     }
  99   else if (!list_isempty (&rid_all_sorted_list))
 100     {
 101       node = listtail (&rid_all_sorted_list);
 102       c = listgetdata (node);
 103       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
 104     }
 105 }
 106
 107 static void
 108 router_id_set (struct prefix *p)
 109 {
 110   struct prefix p2;
 111   struct listnode *node;
 112   struct zserv *client;
 113
 114   rid_user_assigned.u.prefix4.s_addr = p->u.prefix4.s_addr;
 115
 116   router_id_get (&p2);
 117
 118   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 119     zsend_router_id_update (client, &p2);
 120 }
 121
 122 void
 123 router_id_add_address (struct connected *ifc)
 124 {
 125   struct list *l = NULL;
 126   struct listnode *node;
 127   struct prefix before;
 128   struct prefix after;
 129   struct zserv *client;
 130
 131   if (router_id_bad_address (ifc))
 132     return;
 133
 134   router_id_get (&before);
 135
 136   if (!strncmp (ifc->ifp->name, "lo", 2)
 137       || !strncmp (ifc->ifp->name, "dummy", 5))
 138     l = &rid_lo_sorted_list;
 139   else
 140     l = &rid_all_sorted_list;
 141
 142   if (!router_id_find_node (l, ifc))
 143     listnode_add (l, ifc);
 144
 145   router_id_get (&after);
 146
 147   if (prefix_same (&before, &after))
 148     return;
 149
 150   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 151     zsend_router_id_update (client, &after);
 152 }
 153
 154 void
 155 router_id_del_address (struct connected *ifc)
 156 {
 157   struct connected *c;
 158   struct list *l;
 159   struct prefix after;
 160   struct prefix before;
 161   struct listnode *node;
 162   struct zserv *client;
 163
 164   if (router_id_bad_address (ifc))
 165     return;
 166
 167   router_id_get (&before);
 168
 169   if (!strncmp (ifc->ifp->name, "lo", 2)
 170       || !strncmp (ifc->ifp->name, "dummy", 5))
 171     l = &rid_lo_sorted_list;
 172   else
 173     l = &rid_all_sorted_list;
 174
 175   if ((c = router_id_find_node (l, ifc)))
 176     listnode_delete (l, c);
 177
 178   router_id_get (&after);
 179
 180   if (prefix_same (&before, &after))
 181     return;
 182
 183   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
 184     zsend_router_id_update (client, &after);
 185 }
 186
 187 void
 188 router_id_write (struct vty *vty)
 189 {
 190   if (rid_user_assigned.u.prefix4.s_addr)
 191     vty_out (vty, "router-id %s%s", inet_ntoa (rid_user_assigned.u.prefix4),
 192              VTY_NEWLINE);
 193 }
 194
 195 DEFUN (router_id,
 196        router_id_cmd,
 197        "router-id A.B.C.D",
 198        "Manually set the router-id\n"
 199        "IP address to use for router-id\n")
 200 {
 201   struct prefix rid;
 202
 203   rid.u.prefix4.s_addr = inet_addr (argv[0]);
 204   if (!rid.u.prefix4.s_addr)
 205     return CMD_WARNING;
 206
 207   rid.prefixlen = 32;
 208   rid.family = AF_INET;
 209
 210   router_id_set (&rid);
 211
 212   return CMD_SUCCESS;
 213 }
 214
 215 DEFUN (no_router_id,
 216        no_router_id_cmd,
 217        "no router-id",
 218        NO_STR
 219        "Remove the manually configured router-id\n")
 220 {
 221   struct prefix rid;
 222
 223   rid.u.prefix4.s_addr = 0;
 224   rid.prefixlen = 0;
 225   rid.family = AF_INET;
 226
 227   router_id_set (&rid);
 228
 229   return CMD_SUCCESS;
 230 }
 231
 232 static int
 233 router_id_cmp (void *a, void *b)
 234 {
 235   unsigned int A, B;
 236
 237   A = ((struct connected *) a)->address->u.prefix4.s_addr;
 238   B = ((struct connected *) b)->address->u.prefix4.s_addr;
 239
 240   if (A > B)
 241     return 1;
 242   else if (A < B)
 243     return -1;
 244   return 0;
 245 }
 246
 247 void
 248 router_id_init (void)
 249 {
 250   install_element (CONFIG_NODE, &router_id_cmd);
 251   install_element (CONFIG_NODE, &no_router_id_cmd);
 252
 253   memset (&rid_all_sorted_list, 0, sizeof (rid_all_sorted_list));
 254   memset (&rid_lo_sorted_list, 0, sizeof (rid_lo_sorted_list));
 255   memset (&rid_user_assigned, 0, sizeof (rid_user_assigned));
 256
 257   rid_all_sorted_list.cmp = router_id_cmp;
 258   rid_lo_sorted_list.cmp = router_id_cmp;
 259
 260   rid_user_assigned.family = AF_INET;
 261   rid_user_assigned.prefixlen = 32;
 262 }