bsd/net/if_mib.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * Copyright 1996 Massachusetts Institute of Technology
  25  *
  26  * Permission to use, copy, modify, and distribute this software and
  27  * its documentation for any purpose and without fee is hereby
  28  * granted, provided that both the above copyright notice and this
  29  * permission notice appear in all copies, that both the above
  30  * copyright notice and this permission notice appear in all
  31  * supporting documentation, and that the name of M.I.T. not be used
  32  * in advertising or publicity pertaining to distribution of the
  33  * software without specific, written prior permission.  M.I.T. makes
  34  * no representations about the suitability of this software for any
  35  * purpose.  It is provided "as is" without express or implied
  36  * warranty.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  39  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  40  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  41  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  42  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  44  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  45  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  46  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  47  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  48  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  49  * SUCH DAMAGE.
  50  *
  51  * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
  52  */
  53
  54 #include <sys/param.h>
  55 #include <sys/systm.h>
  56 #include <sys/kernel.h>
  57 #include <sys/socket.h>
  58 #include <sys/sysctl.h>
  59 #include <sys/systm.h>
  60
  61 #include <net/if.h>
  62 #include <net/if_mib.h>
  63
  64 #if NETMIBS
  65
  66 /*
  67  * A sysctl(3) MIB for generic interface information.  This information
  68  * is exported in the net.link.generic branch, which has the following
  69  * structure:
  70  *
  71  * net.link.generic     .system                 - system-wide control variables
  72  *                                                and statistics (node)
  73  *                      .ifdata.<ifindex>.general
  74  *                                              - what's in `struct ifdata'
  75  *                                                plus some other info
  76  *                      .ifdata.<ifindex>.linkspecific
  77  *                                              - a link-type-specific data
  78  *                                                structure (as might be used
  79  *                                                by an SNMP agent
  80  *
  81  * Perhaps someday we will make addresses accessible via this interface
  82  * as well (then there will be four such...).  The reason that the
  83  * index comes before the last element in the name is because it
  84  * seems more orthogonal that way, particularly with the possibility
  85  * of other per-interface data living down here as well (e.g., integrated
  86  * services stuff).
  87  */
  88
  89 SYSCTL_DECL(_net_link_generic);
  90
  91 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RD, 0,
  92             "Variables global to all interfaces");
  93
  94 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
  95            &if_index, 0, "Number of configured interfaces");
  96
  97 static int sysctl_ifdata SYSCTL_HANDLER_ARGS;
  98 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RD,
  99             sysctl_ifdata, "Interface table");
 100
 101 static int sysctl_ifalldata SYSCTL_HANDLER_ARGS;
 102 SYSCTL_NODE(_net_link_generic, IFMIB_IFALLDATA, ifalldata, CTLFLAG_RD,
 103             sysctl_ifalldata, "Interface table");
 104
 105 static int make_ifmibdata(struct ifnet *, int *, struct sysctl_req *);
 106
 107
 108 int
 109 make_ifmibdata(struct ifnet *ifp, int *name, struct sysctl_req *req)
 110 {
 111         struct ifmibdata        ifmd;
 112         int error = 0;
 113
 114         switch(name[1]) {
 115         default:
 116                 error = ENOENT;
 117                 break;
 118
 119         case IFDATA_GENERAL:
 120
 121                 bzero(&ifmd, sizeof(ifmd));
 122                 snprintf(ifmd.ifmd_name, sizeof(ifmd.ifmd_name), "%s%d",
 123                         ifp->if_name, ifp->if_unit);
 124
 125 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 126                 COPY(pcount);
 127                 COPY(flags);
 128                 if_data_internal_to_if_data64(&ifp->if_data, &ifmd.ifmd_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                         break;
 137
 138 #ifdef IF_MIB_WR
 139                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 140                 if (error)
 141                         break;
 142
 143 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 144                 DONTCOPY(type);
 145                 DONTCOPY(physical);
 146                 DONTCOPY(addrlen);
 147                 DONTCOPY(hdrlen);
 148                 DONTCOPY(mtu);
 149                 DONTCOPY(metric);
 150                 DONTCOPY(baudrate);
 151 #undef DONTCOPY
 152 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 153                 COPY(data);
 154                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 155                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 156 #undef COPY
 157 #endif /* IF_MIB_WR */
 158                 break;
 159
 160         case IFDATA_LINKSPECIFIC:
 161                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 162                 if (error || !req->newptr)
 163                         break;
 164
 165 #ifdef IF_MIB_WR
 166                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 167                 if (error)
 168                         break;
 169 #endif /* IF_MIB_WR */
 170                 break;
 171         }
 172
 173         return error;
 174 }
 175
 176 int
 177 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 178 {
 179         int *name = (int *)arg1;
 180         int error = 0;
 181         u_int namelen = arg2;
 182         struct ifnet *ifp;
 183
 184         if (namelen != 2)
 185                 return EINVAL;
 186
 187         if (name[0] <= 0 || name[0] > if_index ||
 188             (ifp = ifindex2ifnet[name[0]]) == NULL)
 189                 return ENOENT;
 190
 191         ifnet_lock_shared(ifp);
 192
 193         error = make_ifmibdata(ifp, name, req);
 194
 195         ifnet_lock_done(ifp);
 196
 197         return error;
 198 }
 199
 200 int
 201 sysctl_ifalldata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 202 {
 203         int *name = (int *)arg1;
 204         int error = 0;
 205         u_int namelen = arg2;
 206         struct ifnet *ifp;
 207
 208         if (namelen != 2)
 209                 return EINVAL;
 210
 211         ifnet_head_lock_shared();
 212         TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
 213                 ifnet_lock_shared(ifp);
 214
 215                 error = make_ifmibdata(ifp, name, req);
 216
 217                 ifnet_lock_done(ifp);
 218                 if (error)
 219                         break;
 220         }
 221         ifnet_head_done();
 222         return error;
 223 }
 224
 225 #endif