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  * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
  51  */
  52
  53 #include <sys/param.h>
  54 #include <sys/systm.h>
  55 #include <sys/kernel.h>
  56 #include <sys/socket.h>
  57 #include <sys/sysctl.h>
  58 #include <sys/systm.h>
  59
  60 #include <net/if.h>
  61 #include <net/if_mib.h>
  62
  63 #if NETMIBS
  64
  65 /*
  66  * A sysctl(3) MIB for generic interface information.  This information
  67  * is exported in the net.link.generic branch, which has the following
  68  * structure:
  69  *
  70  * net.link.generic     .system                 - system-wide control variables
  71  *                                                and statistics (node)
  72  *                      .ifdata.<ifindex>.general
  73  *                                              - what's in `struct ifdata'
  74  *                                                plus some other info
  75  *                      .ifdata.<ifindex>.linkspecific
  76  *                                              - a link-type-specific data
  77  *                                                structure (as might be used
  78  *                                                by an SNMP agent
  79  *
  80  * Perhaps someday we will make addresses accessible via this interface
  81  * as well (then there will be four such...).  The reason that the
  82  * index comes before the last element in the name is because it
  83  * seems more orthogonal that way, particularly with the possibility
  84  * of other per-interface data living down here as well (e.g., integrated
  85  * services stuff).
  86  */
  87
  88 SYSCTL_DECL(_net_link_generic);
  89
  90 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RD, 0,
  91             "Variables global to all interfaces");
  92
  93 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
  94            &if_index, 0, "Number of configured interfaces");
  95
  96 static int sysctl_ifdata SYSCTL_HANDLER_ARGS;
  97 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RD,
  98             sysctl_ifdata, "Interface table");
  99
 100 static int sysctl_ifalldata SYSCTL_HANDLER_ARGS;
 101 SYSCTL_NODE(_net_link_generic, IFMIB_IFALLDATA, ifalldata, CTLFLAG_RD,
 102             sysctl_ifalldata, "Interface table");
 103
 104 static int make_ifmibdata(struct ifnet *, int *, struct sysctl_req *);
 105
 106
 107 int
 108 make_ifmibdata(struct ifnet *ifp, int *name, struct sysctl_req *req)
 109 {
 110         struct ifmibdata        ifmd;
 111         int error = 0;
 112
 113         switch(name[1]) {
 114         default:
 115                 error = ENOENT;
 116                 break;
 117
 118         case IFDATA_GENERAL:
 119
 120                 bzero(&ifmd, sizeof(ifmd));
 121                 snprintf(ifmd.ifmd_name, sizeof(ifmd.ifmd_name), "%s%d",
 122                         ifp->if_name, ifp->if_unit);
 123
 124 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 125                 COPY(pcount);
 126                 COPY(flags);
 127                 if_data_internal_to_if_data64(&ifp->if_data, &ifmd.ifmd_data);
 128 #undef COPY
 129                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
 130                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
 131                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
 132
 133                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 134                 if (error || !req->newptr)
 135                         break;
 136
 137 #ifdef IF_MIB_WR
 138                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 139                 if (error)
 140                         break;
 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 #endif /* IF_MIB_WR */
 157                 break;
 158
 159         case IFDATA_LINKSPECIFIC:
 160                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 161                 if (error || !req->newptr)
 162                         break;
 163
 164 #ifdef IF_MIB_WR
 165                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 166                 if (error)
 167                         break;
 168 #endif /* IF_MIB_WR */
 169                 break;
 170         }
 171
 172         return error;
 173 }
 174
 175 int
 176 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 177 {
 178         int *name = (int *)arg1;
 179         int error = 0;
 180         u_int namelen = arg2;
 181         struct ifnet *ifp;
 182
 183         if (namelen != 2)
 184                 return EINVAL;
 185
 186         if (name[0] <= 0 || name[0] > if_index ||
 187             (ifp = ifindex2ifnet[name[0]]) == NULL)
 188                 return ENOENT;
 189
 190         ifnet_lock_shared(ifp);
 191
 192         error = make_ifmibdata(ifp, name, req);
 193
 194         ifnet_lock_done(ifp);
 195
 196         return error;
 197 }
 198
 199 int
 200 sysctl_ifalldata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 201 {
 202         int *name = (int *)arg1;
 203         int error = 0;
 204         u_int namelen = arg2;
 205         struct ifnet *ifp;
 206
 207         if (namelen != 2)
 208                 return EINVAL;
 209
 210         ifnet_head_lock_shared();
 211         TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
 212                 ifnet_lock_shared(ifp);
 213
 214                 error = make_ifmibdata(ifp, name, req);
 215
 216                 ifnet_lock_done(ifp);
 217                 if (error)
 218                         break;
 219         }
 220         ifnet_head_done();
 221         return error;
 222 }
 223
 224 #endif