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Annotation of embedaddon/quagga/zebra/mtu_kvm.c, revision 1.1.1.1

1.1       misho       1: /* MTU get using kvm_read.
                      2:  * Copyright (C) 1999 Kunihiro Ishiguro
                      3:  *
                      4:  * This file is part of GNU Zebra.
                      5:  *
                      6:  * GNU Zebra is free software; you can redistribute it and/or modify it
                      7:  * under the terms of the GNU General Public License as published by the
                      8:  * Free Software Foundation; either version 2, or (at your option) any
                      9:  * later version.
                     10:  *
                     11:  * GNU Zebra is distributed in the hope that it will be useful, but
                     12:  * WITHOUT ANY WARRANTY; without even the implied warranty of
                     13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
                     14:  * General Public License for more details.
                     15:  *
                     16:  * You should have received a copy of the GNU General Public License
                     17:  * along with GNU Zebra; see the file COPYING.  If not, write to the Free
                     18:  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
                     19:  * 02111-1307, USA.  
                     20:  */
                     21: 
                     22: #include <zebra.h>
                     23: 
                     24: #include <kvm.h>
                     25: #include <limits.h>
                     26: #include <fcntl.h>
                     27: 
                     28: #include "if.h"
                     29: 
                     30: /* get interface MTU to use kvm_read */
                     31: void
                     32: if_kvm_get_mtu (struct interface *ifp)
                     33: {
                     34:   kvm_t *kvmd;
                     35:   struct ifnet ifnet;
                     36:   unsigned long ifnetaddr;
                     37:   int len;
                     38:  
                     39:   char ifname[IFNAMSIZ];
                     40:   char tname[INTERFACE_NAMSIZ + 1];
                     41:   char buf[_POSIX2_LINE_MAX];
                     42:  
                     43:   struct nlist nl[] = 
                     44:   {
                     45:     {"_ifnet"},
                     46:     {""}
                     47:   };
                     48: 
                     49:   ifp->mtu6 = ifp->mtu = -1;
                     50:   
                     51:   kvmd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, buf);
                     52: 
                     53:   if (kvmd == NULL) 
                     54:     return ;
                     55:   
                     56:   kvm_nlist(kvmd, nl);
                     57:  
                     58:   ifnetaddr = nl[0].n_value;
                     59:  
                     60:   if (kvm_read(kvmd, ifnetaddr, (char *)&ifnetaddr, sizeof ifnetaddr) < 0) 
                     61:     {
                     62:       kvm_close (kvmd);
                     63:       return ;
                     64:     }
                     65:  
                     66:   while(ifnetaddr != 0) 
                     67:     {
                     68:       if (kvm_read (kvmd, ifnetaddr, (char *)&ifnet, sizeof ifnet) < 0) 
                     69:        {
                     70:          kvm_close (kvmd);
                     71:          return ;
                     72:        }
                     73: 
                     74:       if (kvm_read (kvmd, (u_long)ifnet.if_name, ifname, IFNAMSIZ) < 0) 
                     75:        {
                     76:          kvm_close (kvmd);
                     77:          return ;
                     78:        }
                     79: 
                     80:       len = snprintf (tname, INTERFACE_NAMSIZ + 1, 
                     81:                      "%s%d", ifname, ifnet.if_unit);
                     82: 
                     83:       if (strncmp (tname, ifp->name, len) == 0)
                     84:        break;
                     85: 
                     86:       ifnetaddr = (u_long)ifnet.if_next;
                     87:     }
                     88: 
                     89:   kvm_close (kvmd);
                     90: 
                     91:   if (ifnetaddr == 0) 
                     92:     {
                     93:       return ;
                     94:     }
                     95: 
                     96:   ifp->mtu6 = ifp->mtu = ifnet.if_mtu;
                     97: }