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
28#include "zebra/zserv.h"
29#include "zebra/rt.h"
30#include "zebra/kernel_socket.h"
31
32/* Kernel routing table read up by sysctl function. */
33void
34route_read (void)
35{
36  caddr_t buf, end, ref;
37  size_t bufsiz;
38  struct rt_msghdr *rtm;
39
40#define MIBSIZ 6
41  int mib[MIBSIZ] =
42  {
43    CTL_NET,
44    PF_ROUTE,
45    0,
46    0,
47    NET_RT_DUMP,
48    0
49  };
50
51  /* Get buffer size. */
52  if (sysctl (mib, MIBSIZ, NULL, &bufsiz, NULL, 0) < 0)
53    {
54      zlog_warn ("sysctl fail: %s", safe_strerror (errno));
55      return;
56    }
57
58  /* Allocate buffer. */
59  ref = buf = XMALLOC (MTYPE_TMP, bufsiz);
60
61  /* Read routing table information by calling sysctl(). */
62  if (sysctl (mib, MIBSIZ, buf, &bufsiz, NULL, 0) < 0)
63    {
64      zlog_warn ("sysctl() fail by %s", safe_strerror (errno));
65      return;
66    }
67
68  for (end = buf + bufsiz; buf < end; buf += rtm->rtm_msglen)
69    {
70      rtm = (struct rt_msghdr *) buf;
71      /* We must set RTF_DONE here, so rtm_read() doesn't ignore the message. */
72      SET_FLAG (rtm->rtm_flags, RTF_DONE);
73      rtm_read (rtm);
74    }
75
76  /* Free buffer. */
77  XFREE (MTYPE_TMP, ref);
78
79  return;
80}
81