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Annotation of embedaddon/quagga/zebra/mtu_kvm.c, revision 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: }