bsd/net/if_mib.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright 1996 Massachusetts Institute of Technology
  24  *
  25  * Permission to use, copy, modify, and distribute this software and
  26  * its documentation for any purpose and without fee is hereby
  27  * granted, provided that both the above copyright notice and this
  28  * permission notice appear in all copies, that both the above
  29  * copyright notice and this permission notice appear in all
  30  * supporting documentation, and that the name of M.I.T. not be used
  31  * in advertising or publicity pertaining to distribution of the
  32  * software without specific, written prior permission.  M.I.T. makes
  33  * no representations about the suitability of this software for any
  34  * purpose.  It is provided "as is" without express or implied
  35  * warranty.
  36  *
  37  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  38  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  39  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  40  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  41  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  42  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  43  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  44  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  45  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  46  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  47  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  *
  50  */
  51
  52 #include <sys/param.h>
  53 #include <sys/systm.h>
  54 #include <sys/kernel.h>
  55 #include <sys/socket.h>
  56 #include <sys/sysctl.h>
  57
  58 #include <net/if.h>
  59 #include <net/if_mib.h>
  60
  61 #if NETMIBS
  62
  63 /*
  64  * A sysctl(3) MIB for generic interface information.  This information
  65  * is exported in the net.link.generic branch, which has the following
  66  * structure:
  67  *
  68  * net.link.generic     .system                 - system-wide control variables
  69  *                                                and statistics (node)
  70  *                      .ifdata.<ifindex>.general
  71  *                                              - what's in `struct ifdata'
  72  *                                                plus some other info
  73  *                      .ifdata.<ifindex>.linkspecific
  74  *                                              - a link-type-specific data
  75  *                                                structure (as might be used
  76  *                                                by an SNMP agent
  77  *
  78  * Perhaps someday we will make addresses accessible via this interface
  79  * as well (then there will be four such...).  The reason that the
  80  * index comes before the last element in the name is because it
  81  * seems more orthogonal that way, particularly with the possibility
  82  * of other per-interface data living down here as well (e.g., integrated
  83  * services stuff).
  84  */
  85
  86 SYSCTL_DECL(_net_link_generic);
  87 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
  88             "Variables global to all interfaces");
  89 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
  90            &if_index, 0, "Number of configured interfaces");
  91
  92 static int
  93 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
  94 {
  95         int *name = (int *)arg1;
  96         int error, ifnlen;
  97         u_int namelen = arg2;
  98         struct ifnet *ifp;
  99         char workbuf[64];
 100         struct ifmibdata ifmd;
 101
 102         if (namelen != 2)
 103                 return EINVAL;
 104
 105         if (name[0] <= 0 || name[0] > if_index)
 106                 return ENOENT;
 107
 108         ifp = ifnet_addrs[name[0] - 1]->ifa_ifp;
 109
 110         switch(name[1]) {
 111         default:
 112                 return ENOENT;
 113
 114         case IFDATA_GENERAL:
 115             /*
 116                 ifnlen = snprintf(workbuf, sizeof(workbuf),
 117                     "%s%d", ifp->if_name, ifp->if_unit);
 118                 if(ifnlen + 1 > sizeof ifmd.ifmd_name) {
 119                         return ENAMETOOLONG;
 120                 } else {
 121                         strcpy(ifmd.ifmd_name, workbuf);
 122                 }
 123             */
 124
 125 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 126                 COPY(pcount);
 127                 COPY(flags);
 128                 COPY(data);
 129 #undef COPY
 130                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
 131                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
 132                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
 133
 134                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 135                 if (error || !req->newptr)
 136                         return error;
 137
 138                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 139                 if (error)
 140                         return error;
 141
 142 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 143                 DONTCOPY(type);
 144                 DONTCOPY(physical);
 145                 DONTCOPY(addrlen);
 146                 DONTCOPY(hdrlen);
 147                 DONTCOPY(mtu);
 148                 DONTCOPY(metric);
 149                 DONTCOPY(baudrate);
 150 #undef DONTCOPY
 151 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 152                 COPY(data);
 153                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 154                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 155 #undef COPY
 156                 break;
 157
 158         case IFDATA_LINKSPECIFIC:
 159                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 160                 if (error || !req->newptr)
 161                         return error;
 162
 163                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 164                 if (error)
 165                         return error;
 166
 167         }
 168         return 0;
 169 }
 170
 171 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
 172             sysctl_ifdata, "Interface table");
 173
 174 #endif