bsd/net/if_mib.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright 1996 Massachusetts Institute of Technology
  27  *
  28  * Permission to use, copy, modify, and distribute this software and
  29  * its documentation for any purpose and without fee is hereby
  30  * granted, provided that both the above copyright notice and this
  31  * permission notice appear in all copies, that both the above
  32  * copyright notice and this permission notice appear in all
  33  * supporting documentation, and that the name of M.I.T. not be used
  34  * in advertising or publicity pertaining to distribution of the
  35  * software without specific, written prior permission.  M.I.T. makes
  36  * no representations about the suitability of this software for any
  37  * purpose.  It is provided "as is" without express or implied
  38  * warranty.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  41  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  42  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  43  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  44  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  46  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  47  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  48  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  49  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  50  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
  54  */
  55
  56 #include <sys/param.h>
  57 #include <sys/systm.h>
  58 #include <sys/kernel.h>
  59 #include <sys/socket.h>
  60 #include <sys/sysctl.h>
  61
  62 #include <net/if.h>
  63 #include <net/if_mib.h>
  64
  65 #if NETMIBS
  66
  67 /*
  68  * A sysctl(3) MIB for generic interface information.  This information
  69  * is exported in the net.link.generic branch, which has the following
  70  * structure:
  71  *
  72  * net.link.generic     .system                 - system-wide control variables
  73  *                                                and statistics (node)
  74  *                      .ifdata.<ifindex>.general
  75  *                                              - what's in `struct ifdata'
  76  *                                                plus some other info
  77  *                      .ifdata.<ifindex>.linkspecific
  78  *                                              - a link-type-specific data
  79  *                                                structure (as might be used
  80  *                                                by an SNMP agent
  81  *
  82  * Perhaps someday we will make addresses accessible via this interface
  83  * as well (then there will be four such...).  The reason that the
  84  * index comes before the last element in the name is because it
  85  * seems more orthogonal that way, particularly with the possibility
  86  * of other per-interface data living down here as well (e.g., integrated
  87  * services stuff).
  88  */
  89
  90 SYSCTL_DECL(_net_link_generic);
  91 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
  92             "Variables global to all interfaces");
  93 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
  94            &if_index, 0, "Number of configured interfaces");
  95
  96 static int
  97 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
  98 {
  99         int *name = (int *)arg1;
 100         int error, ifnlen;
 101         u_int namelen = arg2;
 102         struct ifnet *ifp;
 103         char workbuf[64];
 104         struct ifmibdata ifmd;
 105
 106         if (namelen != 2)
 107                 return EINVAL;
 108
 109         if (name[0] <= 0 || name[0] > if_index)
 110                 return ENOENT;
 111
 112         ifp = ifnet_addrs[name[0] - 1]->ifa_ifp;
 113
 114         switch(name[1]) {
 115         default:
 116                 return ENOENT;
 117
 118         case IFDATA_GENERAL:
 119             /*
 120                 ifnlen = snprintf(workbuf, sizeof(workbuf),
 121                     "%s%d", ifp->if_name, ifp->if_unit);
 122                 if(ifnlen + 1 > sizeof ifmd.ifmd_name) {
 123                         return ENAMETOOLONG;
 124                 } else {
 125                         strcpy(ifmd.ifmd_name, workbuf);
 126                 }
 127             */
 128
 129 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 130                 COPY(pcount);
 131                 COPY(flags);
 132                 COPY(data);
 133 #undef COPY
 134                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
 135                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
 136                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
 137
 138                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 139                 if (error || !req->newptr)
 140                         return error;
 141
 142                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 143                 if (error)
 144                         return error;
 145
 146 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 147                 DONTCOPY(type);
 148                 DONTCOPY(physical);
 149                 DONTCOPY(addrlen);
 150                 DONTCOPY(hdrlen);
 151                 DONTCOPY(mtu);
 152                 DONTCOPY(metric);
 153                 DONTCOPY(baudrate);
 154 #undef DONTCOPY
 155 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 156                 COPY(data);
 157                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 158                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 159 #undef COPY
 160                 break;
 161
 162         case IFDATA_LINKSPECIFIC:
 163                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 164                 if (error || !req->newptr)
 165                         return error;
 166
 167                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 168                 if (error)
 169                         return error;
 170
 171         }
 172         return 0;
 173 }
 174
 175 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
 176             sysctl_ifdata, "Interface table");
 177
 178 #endif