zebra/if_sysctl.c

   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       XFREE(MTYPE_TMP, ref);
  73       return;
  74     }
  75
  76   /* Parse both interfaces and addresses. */
  77   for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen)
  78     {
  79       ifm = (struct if_msghdr *) buf;
  80       if (ifm->ifm_type == RTM_IFINFO)
  81         {
  82           ifp = if_lookup_by_index (ifm->ifm_index);
  83           if (ifp)
  84             ifp->stats = ifm->ifm_data;
  85         }
  86     }
  87
  88   /* Free sysctl buffer. */
  89   XFREE (MTYPE_TMP, ref);
  90
  91   return;
  92 }
  93
  94 /* Interface listing up function using sysctl(). */
  95 void
  96 interface_list (struct zebra_vrf *zvrf)
  97 {
  98   caddr_t ref, buf, end;
  99   size_t bufsiz;
 100   struct if_msghdr *ifm;
 101
 102 #define MIBSIZ 6
 103   int mib[MIBSIZ] =
 104   {
 105     CTL_NET,
 106     PF_ROUTE,
 107     0,
 108     0, /*  AF_INET & AF_INET6 */
 109     NET_RT_IFLIST,
 110     0
 111   };
 112
 113   if (zvrf->vrf_id != VRF_DEFAULT)
 114     {
 115       zlog_warn ("interface_list: ignore VRF %u", zvrf->vrf_id);
 116       return;
 117     }
 118
 119   /* Query buffer size. */
 120   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0)
 121     {
 122       zlog (NULL, LOG_WARNING, "sysctl() error by %s", safe_strerror (errno));
 123       return;
 124     }
 125
 126   /* We free this memory at the end of this function. */
 127   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
 128
 129   /* Fetch interface informations into allocated buffer. */
 130   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0)
 131     {
 132       zlog (NULL, LOG_WARNING, "sysctl error by %s", safe_strerror (errno));
 133       return;
 134     }
 135
 136   /* Parse both interfaces and addresses. */
 137   for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen)
 138     {
 139       ifm = (struct if_msghdr *) buf;
 140
 141       switch (ifm->ifm_type)
 142         {
 143         case RTM_IFINFO:
 144           ifm_read (ifm);
 145           break;
 146         case RTM_NEWADDR:
 147           ifam_read ((struct ifa_msghdr *) ifm);
 148           break;
 149         default:
 150           zlog_info ("interfaces_list(): unexpected message type");
 151           XFREE (MTYPE_TMP, ref);
 152           return;
 153           break;
 154         }
 155     }
 156
 157   /* Free sysctl buffer. */
 158   XFREE (MTYPE_TMP, ref);
 159 }