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quagga 1.0.20160315

    1: /*
    2:  * Get interface's address and mask information 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 "if.h"
   26: #include "sockunion.h"
   27: #include "prefix.h"
   28: #include "connected.h"
   29: #include "memory.h"
   30: #include "ioctl.h"
   31: #include "log.h"
   32: #include "interface.h"
   33: #include "vrf.h"
   34: 
   35: #include "zebra/rt.h"
   36: #include "zebra/kernel_socket.h"
   37: #include "zebra/rib.h"
   38: 
   39: void
   40: ifstat_update_sysctl (void)
   41: {
   42:   caddr_t ref, buf, end;
   43:   size_t bufsiz;
   44:   struct if_msghdr *ifm;
   45:   struct interface *ifp;
   46: 
   47: #define MIBSIZ 6
   48:   int mib[MIBSIZ] =
   49:   { 
   50:     CTL_NET,
   51:     PF_ROUTE,
   52:     0,
   53:     0, /*  AF_INET & AF_INET6 */
   54:     NET_RT_IFLIST,
   55:     0 
   56:   };
   57: 
   58:   /* Query buffer size. */
   59:   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) 
   60:     {
   61:       zlog_warn ("sysctl() error by %s", safe_strerror (errno));
   62:       return;
   63:     }
   64: 
   65:   /* We free this memory at the end of this function. */
   66:   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
   67: 
   68:   /* Fetch interface informations into allocated buffer. */
   69:   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) 
   70:     {
   71:       zlog (NULL, LOG_WARNING, "sysctl error by %s", safe_strerror (errno));
   72:       return;
   73:     }
   74: 
   75:   /* Parse both interfaces and addresses. */
   76:   for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen) 
   77:     {
   78:       ifm = (struct if_msghdr *) buf;
   79:       if (ifm->ifm_type == RTM_IFINFO)
   80: 	{
   81: 	  ifp = if_lookup_by_index (ifm->ifm_index);
   82: 	  if (ifp)
   83: 	    ifp->stats = ifm->ifm_data;
   84: 	}
   85:     }
   86: 
   87:   /* Free sysctl buffer. */
   88:   XFREE (MTYPE_TMP, ref);
   89: 
   90:   return;
   91: }
   92: 
   93: /* Interface listing up function using sysctl(). */
   94: void
   95: interface_list (struct zebra_vrf *zvrf)
   96: {
   97:   caddr_t ref, buf, end;
   98:   size_t bufsiz;
   99:   struct if_msghdr *ifm;
  100: 
  101: #define MIBSIZ 6
  102:   int mib[MIBSIZ] =
  103:   { 
  104:     CTL_NET,
  105:     PF_ROUTE,
  106:     0,
  107:     0, /*  AF_INET & AF_INET6 */
  108:     NET_RT_IFLIST,
  109:     0 
  110:   };
  111: 
  112:   if (zvrf->vrf_id != VRF_DEFAULT)
  113:     {
  114:       zlog_warn ("interface_list: ignore VRF %u", zvrf->vrf_id);
  115:       return;
  116:     }
  117: 
  118:   /* Query buffer size. */
  119:   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0) 
  120:     {
  121:       zlog (NULL, LOG_WARNING, "sysctl() error by %s", safe_strerror (errno));
  122:       return;
  123:     }
  124: 
  125:   /* We free this memory at the end of this function. */
  126:   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
  127: 
  128:   /* Fetch interface informations into allocated buffer. */
  129:   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0) 
  130:     {
  131:       zlog (NULL, LOG_WARNING, "sysctl error by %s", safe_strerror (errno));
  132:       return;
  133:     }
  134: 
  135:   /* Parse both interfaces and addresses. */
  136:   for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen) 
  137:     {
  138:       ifm = (struct if_msghdr *) buf;
  139: 
  140:       switch (ifm->ifm_type) 
  141: 	{
  142: 	case RTM_IFINFO:
  143: 	  ifm_read (ifm);
  144: 	  break;
  145: 	case RTM_NEWADDR:
  146: 	  ifam_read ((struct ifa_msghdr *) ifm);
  147: 	  break;
  148: 	default:
  149: 	  zlog_info ("interfaces_list(): unexpected message type");
  150: 	  XFREE (MTYPE_TMP, ref);
  151: 	  return;
  152: 	  break;
  153: 	}
  154:     }
  155: 
  156:   /* Free sysctl buffer. */
  157:   XFREE (MTYPE_TMP, ref);
  158: }