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98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/* MTU get using kvm_read.
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* Copyright (C) 1999 Kunihiro Ishiguro
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*
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* This file is part of GNU Zebra.
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*
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* GNU Zebra is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* GNU Zebra is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Zebra; see the file COPYING. If not, write to the Free
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* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <zebra.h>
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#include <kvm.h>
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#include <limits.h>
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#include <fcntl.h>
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#include "if.h"
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/* get interface MTU to use kvm_read */
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void
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if_kvm_get_mtu (struct interface *ifp)
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{
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kvm_t *kvmd;
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struct ifnet ifnet;
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unsigned long ifnetaddr;
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int len;
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char ifname[IFNAMSIZ];
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char tname[INTERFACE_NAMSIZ + 1];
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char buf[_POSIX2_LINE_MAX];
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struct nlist nl[] =
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{
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{"_ifnet"},
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{""}
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};
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ifp->mtu = -1;
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kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
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if (kvmd == NULL)
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return ;
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kvm_nlist(kvmd, nl);
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ifnetaddr = nl[0].n_value;
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if (kvm_read(kvmd, ifnetaddr, (char *)&ifnetaddr, sizeof ifnetaddr) < 0)
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{
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kvm_close (kvmd);
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return ;
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}
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while(ifnetaddr != 0)
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{
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if (kvm_read (kvmd, ifnetaddr, (char *)&ifnet, sizeof ifnet) < 0)
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{
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kvm_close (kvmd);
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return ;
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}
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if (kvm_read (kvmd, (u_long)ifnet.if_name, ifname, IFNAMSIZ) < 0)
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{
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kvm_close (kvmd);
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return ;
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}
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len = snprintf (tname, INTERFACE_NAMSIZ + 1,
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"%s%d", ifname, ifnet.if_unit);
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if (strncmp (tname, ifp->name, len) == 0)
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break;
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ifnetaddr = (u_long)ifnet.if_next;
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}
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kvm_close (kvmd);
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if (ifnetaddr == 0)
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{
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return ;
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}
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ifp->mtu = ifnet.if_mtu;
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}
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