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quagga 1.0.20160315

    1: /*
    2:  * Kernel routing table read by sysctl function.
    3:  * Copyright (C) 1997, 98 Kunihiro Ishiguro
    4:  *
    5:  * This file is part of GNU Zebra.
    6:  *
    7:  * GNU Zebra is free software; you can redistribute it and/or modify it
    8:  * under the terms of the GNU General Public License as published by the
    9:  * Free Software Foundation; either version 2, or (at your option) any
   10:  * later version.
   11:  *
   12:  * GNU Zebra is distributed in the hope that it will be useful, but
   13:  * WITHOUT ANY WARRANTY; without even the implied warranty of
   14:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   15:  * General Public License for more details.
   16:  *
   17:  * You should have received a copy of the GNU General Public License
   18:  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
   19:  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   20:  * 02111-1307, USA.  
   21:  */
   22: 
   23: #include <zebra.h>
   24: 
   25: #include "memory.h"
   26: #include "log.h"
   27: #include "vrf.h"
   28: 
   29: #include "zebra/zserv.h"
   30: #include "zebra/rt.h"
   31: #include "zebra/kernel_socket.h"
   32: 
   33: /* Kernel routing table read up by sysctl function. */
   34: void
   35: route_read (struct zebra_vrf *zvrf)
   36: {
   37:   caddr_t buf, end, ref;
   38:   size_t bufsiz;
   39:   struct rt_msghdr *rtm;
   40:   
   41: #define MIBSIZ 6
   42:   int mib[MIBSIZ] = 
   43:   {
   44:     CTL_NET,
   45:     PF_ROUTE,
   46:     0,
   47:     0,
   48:     NET_RT_DUMP,
   49:     0
   50:   };
   51: 
   52:   if (zvrf->vrf_id != VRF_DEFAULT)
   53:     return;
   54: 
   55:   /* Get buffer size. */
   56:   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) 
   57:     {
   58:       zlog_warn ("sysctl fail: %s", safe_strerror (errno));
   59:       return;
   60:     }
   61: 
   62:   /* Allocate buffer. */
   63:   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
   64:   
   65:   /* Read routing table information by calling sysctl(). */
   66:   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) 
   67:     {
   68:       zlog_warn ("sysctl() fail by %s", safe_strerror (errno));
   69:       return;
   70:     }
   71: 
   72:   for (end = buf + bufsiz; buf < end; buf += rtm->rtm_msglen) 
   73:     {
   74:       rtm = (struct rt_msghdr *) buf;
   75:       /* We must set RTF_DONE here, so rtm_read() doesn't ignore the message. */
   76:       SET_FLAG (rtm->rtm_flags, RTF_DONE);
   77:       rtm_read (rtm);
   78:     }
   79: 
   80:   /* Free buffer. */
   81:   XFREE (MTYPE_TMP, ref);
   82: 
   83:   return;
   84: }