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