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    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: #include "zebra/redistribute.h"
   43: 
   44: static struct list rid_all_sorted_list;
   45: static struct list rid_lo_sorted_list;
   46: static struct prefix rid_user_assigned;
   47: 
   48: /* master zebra server structure */
   49: extern struct zebra_t zebrad;
   50: 
   51: static struct connected *
   52: router_id_find_node (struct list *l, struct connected *ifc)
   53: {
   54:   struct listnode *node;
   55:   struct connected *c;
   56: 
   57:   for (ALL_LIST_ELEMENTS_RO (l, node, c))
   58:     if (prefix_same (ifc->address, c->address))
   59:       return c;
   60: 
   61:   return NULL;
   62: }
   63: 
   64: static int
   65: router_id_bad_address (struct connected *ifc)
   66: {
   67:   if (ifc->address->family != AF_INET)
   68:     return 1;
   69:   
   70:   /* non-redistributable addresses shouldn't be used for RIDs either */
   71:   if (!zebra_check_addr (ifc->address))
   72:     return 1;
   73:   
   74:   return 0;
   75: }
   76: 
   77: void
   78: router_id_get (struct prefix *p)
   79: {
   80:   struct listnode *node;
   81:   struct connected *c;
   82: 
   83:   p->u.prefix4.s_addr = 0;
   84:   p->family = AF_INET;
   85:   p->prefixlen = 32;
   86: 
   87:   if (rid_user_assigned.u.prefix4.s_addr)
   88:     p->u.prefix4.s_addr = rid_user_assigned.u.prefix4.s_addr;
   89:   else if (!list_isempty (&rid_lo_sorted_list))
   90:     {
   91:       node = listtail (&rid_lo_sorted_list);
   92:       c = listgetdata (node);
   93:       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
   94:     }
   95:   else if (!list_isempty (&rid_all_sorted_list))
   96:     {
   97:       node = listtail (&rid_all_sorted_list);
   98:       c = listgetdata (node);
   99:       p->u.prefix4.s_addr = c->address->u.prefix4.s_addr;
  100:     }
  101: }
  102: 
  103: static void
  104: router_id_set (struct prefix *p)
  105: {
  106:   struct prefix p2;
  107:   struct listnode *node;
  108:   struct zserv *client;
  109: 
  110:   rid_user_assigned.u.prefix4.s_addr = p->u.prefix4.s_addr;
  111: 
  112:   router_id_get (&p2);
  113: 
  114:   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
  115:     zsend_router_id_update (client, &p2);
  116: }
  117: 
  118: void
  119: router_id_add_address (struct connected *ifc)
  120: {
  121:   struct list *l = NULL;
  122:   struct listnode *node;
  123:   struct prefix before;
  124:   struct prefix after;
  125:   struct zserv *client;
  126: 
  127:   if (router_id_bad_address (ifc))
  128:     return;
  129: 
  130:   router_id_get (&before);
  131: 
  132:   if (!strncmp (ifc->ifp->name, "lo", 2)
  133:       || !strncmp (ifc->ifp->name, "dummy", 5))
  134:     l = &rid_lo_sorted_list;
  135:   else
  136:     l = &rid_all_sorted_list;
  137:   
  138:   if (!router_id_find_node (l, ifc))
  139:     listnode_add_sort (l, ifc);
  140: 
  141:   router_id_get (&after);
  142: 
  143:   if (prefix_same (&before, &after))
  144:     return;
  145: 
  146:   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
  147:     zsend_router_id_update (client, &after);
  148: }
  149: 
  150: void
  151: router_id_del_address (struct connected *ifc)
  152: {
  153:   struct connected *c;
  154:   struct list *l;
  155:   struct prefix after;
  156:   struct prefix before;
  157:   struct listnode *node;
  158:   struct zserv *client;
  159: 
  160:   if (router_id_bad_address (ifc))
  161:     return;
  162: 
  163:   router_id_get (&before);
  164: 
  165:   if (!strncmp (ifc->ifp->name, "lo", 2)
  166:       || !strncmp (ifc->ifp->name, "dummy", 5))
  167:     l = &rid_lo_sorted_list;
  168:   else
  169:     l = &rid_all_sorted_list;
  170: 
  171:   if ((c = router_id_find_node (l, ifc)))
  172:     listnode_delete (l, c);
  173: 
  174:   router_id_get (&after);
  175: 
  176:   if (prefix_same (&before, &after))
  177:     return;
  178: 
  179:   for (ALL_LIST_ELEMENTS_RO (zebrad.client_list, node, client))
  180:     zsend_router_id_update (client, &after);
  181: }
  182: 
  183: void
  184: router_id_write (struct vty *vty)
  185: {
  186:   if (rid_user_assigned.u.prefix4.s_addr)
  187:     vty_out (vty, "router-id %s%s", inet_ntoa (rid_user_assigned.u.prefix4),
  188: 	     VTY_NEWLINE);
  189: }
  190: 
  191: DEFUN (router_id,
  192:        router_id_cmd,
  193:        "router-id A.B.C.D",
  194:        "Manually set the router-id\n"
  195:        "IP address to use for router-id\n")
  196: {
  197:   struct prefix rid;
  198: 
  199:   rid.u.prefix4.s_addr = inet_addr (argv[0]);
  200:   if (!rid.u.prefix4.s_addr)
  201:     return CMD_WARNING;
  202: 
  203:   rid.prefixlen = 32;
  204:   rid.family = AF_INET;
  205: 
  206:   router_id_set (&rid);
  207: 
  208:   return CMD_SUCCESS;
  209: }
  210: 
  211: DEFUN (no_router_id,
  212:        no_router_id_cmd,
  213:        "no router-id",
  214:        NO_STR
  215:        "Remove the manually configured router-id\n")
  216: {
  217:   struct prefix rid;
  218: 
  219:   rid.u.prefix4.s_addr = 0;
  220:   rid.prefixlen = 0;
  221:   rid.family = AF_INET;
  222: 
  223:   router_id_set (&rid);
  224: 
  225:   return CMD_SUCCESS;
  226: }
  227: 
  228: static int
  229: router_id_cmp (void *a, void *b)
  230: {
  231:   const struct connected *ifa = (const struct connected *)a;
  232:   const struct connected *ifb = (const struct connected *)b;
  233:   unsigned int A = ntohl(ifa->address->u.prefix4.s_addr);
  234:   unsigned int B = ntohl(ifb->address->u.prefix4.s_addr);
  235: 
  236:   return (int) (A - B);
  237: }
  238: 
  239: void
  240: router_id_init (void)
  241: {
  242:   install_element (CONFIG_NODE, &router_id_cmd);
  243:   install_element (CONFIG_NODE, &no_router_id_cmd);
  244: 
  245:   memset (&rid_all_sorted_list, 0, sizeof (rid_all_sorted_list));
  246:   memset (&rid_lo_sorted_list, 0, sizeof (rid_lo_sorted_list));
  247:   memset (&rid_user_assigned, 0, sizeof (rid_user_assigned));
  248: 
  249:   rid_all_sorted_list.cmp = router_id_cmp;
  250:   rid_lo_sorted_list.cmp = router_id_cmp;
  251: 
  252:   rid_user_assigned.family = AF_INET;
  253:   rid_user_assigned.prefixlen = 32;
  254: }