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 "zebra_memory.h"
  31 #include "ioctl.h"
  32 #include "log.h"
  33 #include "interface.h"
  34 #include "vrf.h"
  35
  36 #include "zebra/rt.h"
  37 #include "zebra/kernel_socket.h"
  38 #include "zebra/rib.h"
  39
  40 void
  41 ifstat_update_sysctl (void)
  42 {
  43   caddr_t ref, buf, end;
  44   size_t bufsiz;
  45   struct if_msghdr *ifm;
  46   struct interface *ifp;
  47
  48 #define MIBSIZ 6
  49   int mib[MIBSIZ] =
  50   {
  51     CTL_NET,
  52     PF_ROUTE,
  53     0,
  54     0, /*  AF_INET & AF_INET6 */
  55     NET_RT_IFLIST,
  56     0
  57   };
  58
  59   /* Query buffer size. */
  60   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0)
  61     {
  62       zlog_warn ("sysctl() error by %s", safe_strerror (errno));
  63       return;
  64     }
  65
  66   /* We free this memory at the end of this function. */
  67   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
  68
  69   /* Fetch interface informations into allocated buffer. */
  70   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0)
  71     {
  72       zlog_warn("sysctl error by %s", safe_strerror(errno));
  73       XFREE(MTYPE_TMP, ref);
  74       return;
  75     }
  76
  77   /* Parse both interfaces and addresses. */
  78   for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen)
  79     {
  80       ifm = (struct if_msghdr *) buf;
  81       if (ifm->ifm_type == RTM_IFINFO)
  82         {
  83           ifp = if_lookup_by_index (ifm->ifm_index);
  84           if (ifp)
  85             ifp->stats = ifm->ifm_data;
  86         }
  87     }
  88
  89   /* Free sysctl buffer. */
  90   XFREE (MTYPE_TMP, ref);
  91
  92   return;
  93 }
  94
  95 /* Interface listing up function using sysctl(). */
  96 void
  97 interface_list (struct zebra_ns *zns)
  98 {
  99   caddr_t ref, buf, end;
 100   size_t bufsiz;
 101   struct if_msghdr *ifm;
 102
 103 #define MIBSIZ 6
 104   int mib[MIBSIZ] =
 105   {
 106     CTL_NET,
 107     PF_ROUTE,
 108     0,
 109     0, /*  AF_INET & AF_INET6 */
 110     NET_RT_IFLIST,
 111     0
 112   };
 113
 114   if (zns->ns_id != NS_DEFAULT)
 115     {
 116       zlog_warn ("interface_list: ignore NS %u", zns->ns_id);
 117       return;
 118     }
 119
 120   /* Query buffer size. */
 121   if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0)
 122     {
 123       zlog_warn("sysctl() error by %s", safe_strerror(errno));
 124       return;
 125     }
 126
 127   /* We free this memory at the end of this function. */
 128   ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
 129
 130   /* Fetch interface informations into allocated buffer. */
 131   if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0)
 132     {
 133       zlog_warn("sysctl error by %s", safe_strerror(errno));
 134       return;
 135     }
 136
 137   /* Parse both interfaces and addresses. */
 138   for (end = buf + bufsiz; buf < end; buf += ifm->ifm_msglen)
 139     {
 140       ifm = (struct if_msghdr *) buf;
 141
 142       switch (ifm->ifm_type)
 143         {
 144         case RTM_IFINFO:
 145           ifm_read (ifm);
 146           break;
 147         case RTM_NEWADDR:
 148           ifam_read ((struct ifa_msghdr *) ifm);
 149           break;
 150         default:
 151           zlog_info ("interfaces_list(): unexpected message type");
 152           XFREE (MTYPE_TMP, ref);
 153           return;
 154           break;
 155         }
 156     }
 157
 158   /* Free sysctl buffer. */
 159   XFREE (MTYPE_TMP, ref);
 160 }