bsd/net/if_mib.c

   1 /*
   2  * Copyright (c) 2000-2011 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_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. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright 1996 Massachusetts Institute of Technology
  30  *
  31  * Permission to use, copy, modify, and distribute this software and
  32  * its documentation for any purpose and without fee is hereby
  33  * granted, provided that both the above copyright notice and this
  34  * permission notice appear in all copies, that both the above
  35  * copyright notice and this permission notice appear in all
  36  * supporting documentation, and that the name of M.I.T. not be used
  37  * in advertising or publicity pertaining to distribution of the
  38  * software without specific, written prior permission.  M.I.T. makes
  39  * no representations about the suitability of this software for any
  40  * purpose.  It is provided "as is" without express or implied
  41  * warranty.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  44  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  45  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  46  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  47  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  50  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  51  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  52  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  53  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  *
  56  * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
  57  */
  58
  59 #include <sys/param.h>
  60 #include <sys/systm.h>
  61 #include <sys/kernel.h>
  62 #include <sys/socket.h>
  63 #include <sys/sysctl.h>
  64 #include <sys/systm.h>
  65
  66 #include <net/if.h>
  67 #include <net/if_mib.h>
  68 #include <net/if_var.h>
  69
  70 /*
  71  * A sysctl(3) MIB for generic interface information.  This information
  72  * is exported in the net.link.generic branch, which has the following
  73  * structure:
  74  *
  75  * net.link.generic     .system                 - system-wide control variables
  76  *                                                and statistics (node)
  77  *                      .ifdata.<ifindex>.general
  78  *                                              - what's in `struct ifdata'
  79  *                                                plus some other info
  80  *                      .ifdata.<ifindex>.linkspecific
  81  *                                              - a link-type-specific data
  82  *                                                structure (as might be used
  83  *                                                by an SNMP agent
  84  *
  85  * Perhaps someday we will make addresses accessible via this interface
  86  * as well (then there will be four such...).  The reason that the
  87  * index comes before the last element in the name is because it
  88  * seems more orthogonal that way, particularly with the possibility
  89  * of other per-interface data living down here as well (e.g., integrated
  90  * services stuff).
  91  */
  92
  93 SYSCTL_DECL(_net_link_generic);
  94
  95 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RD|CTLFLAG_LOCKED, 0,
  96             "Variables global to all interfaces");
  97
  98 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD | CTLFLAG_LOCKED,
  99            &if_index, 0, "Number of configured interfaces");
 100
 101 static int sysctl_ifdata SYSCTL_HANDLER_ARGS;
 102 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RD | CTLFLAG_LOCKED,
 103             sysctl_ifdata, "Interface table");
 104
 105 static int sysctl_ifalldata SYSCTL_HANDLER_ARGS;
 106 SYSCTL_NODE(_net_link_generic, IFMIB_IFALLDATA, ifalldata, CTLFLAG_RD | CTLFLAG_LOCKED,
 107             sysctl_ifalldata, "Interface table");
 108
 109 static int make_ifmibdata(struct ifnet *, int *, struct sysctl_req *);
 110
 111 int
 112 make_ifmibdata(struct ifnet *ifp, int *name, struct sysctl_req *req)
 113 {
 114         struct ifmibdata        ifmd;
 115         int error = 0;
 116
 117         switch(name[1]) {
 118         default:
 119                 error = ENOENT;
 120                 break;
 121
 122         case IFDATA_GENERAL:
 123                 bzero(&ifmd, sizeof(ifmd));
 124                 /*
 125                  * Make sure the interface is in use
 126                  */
 127                 if (ifnet_is_attached(ifp, 0)) {
 128                         snprintf(ifmd.ifmd_name, sizeof(ifmd.ifmd_name), "%s%d",
 129                                 ifp->if_name, ifp->if_unit);
 130
 131 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 132                         COPY(pcount);
 133                         COPY(flags);
 134                         if_data_internal_to_if_data64(ifp, &ifp->if_data, &ifmd.ifmd_data);
 135 #undef COPY
 136                         ifmd.ifmd_snd_len = IFCQ_LEN(&ifp->if_snd);
 137                         ifmd.ifmd_snd_maxlen = IFCQ_MAXLEN(&ifp->if_snd);
 138                         ifmd.ifmd_snd_drops = ifp->if_snd.ifcq_dropcnt.packets;
 139                 }
 140                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 141                 if (error || !req->newptr)
 142                         break;
 143
 144 #ifdef IF_MIB_WR
 145                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 146                 if (error)
 147                         break;
 148
 149 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 150                 DONTCOPY(type);
 151                 DONTCOPY(physical);
 152                 DONTCOPY(addrlen);
 153                 DONTCOPY(hdrlen);
 154                 DONTCOPY(mtu);
 155                 DONTCOPY(metric);
 156                 DONTCOPY(baudrate);
 157 #undef DONTCOPY
 158 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 159                 COPY(data);
 160                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 161                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 162 #undef COPY
 163 #endif /* IF_MIB_WR */
 164                 break;
 165
 166         case IFDATA_LINKSPECIFIC:
 167                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 168                 if (error || !req->newptr)
 169                         break;
 170
 171 #ifdef IF_MIB_WR
 172                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 173                 if (error)
 174                         break;
 175 #endif /* IF_MIB_WR */
 176                 break;
 177
 178         case IFDATA_SUPPLEMENTAL: {
 179                 struct ifmibdata_supplemental *ifmd_supp;
 180
 181                 if ((ifmd_supp = _MALLOC(sizeof (*ifmd_supp), M_TEMP,
 182                     M_NOWAIT | M_ZERO)) == NULL) {
 183                         error = ENOMEM;
 184                         break;
 185                 }
 186
 187                 if_copy_traffic_class(ifp, &ifmd_supp->ifmd_traffic_class);
 188                 if_copy_data_extended(ifp, &ifmd_supp->ifmd_data_extended);
 189                 if_copy_packet_stats(ifp, &ifmd_supp->ifmd_packet_stats);
 190                 if_copy_rxpoll_stats(ifp, &ifmd_supp->ifmd_rxpoll_stats);
 191
 192                 error = SYSCTL_OUT(req, ifmd_supp, sizeof (*ifmd_supp));
 193                 _FREE(ifmd_supp, M_TEMP);
 194                 break;
 195         }
 196         }
 197
 198         return error;
 199 }
 200
 201 int
 202 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 203 {
 204 #pragma unused(oidp)
 205         int *name = (int *)arg1;
 206         int error = 0;
 207         u_int namelen = arg2;
 208         struct ifnet *ifp;
 209
 210         if (namelen != 2)
 211                 return (EINVAL);
 212
 213         ifnet_head_lock_shared();
 214         if (name[0] <= 0 || name[0] > if_index ||
 215             (ifp = ifindex2ifnet[name[0]]) == NULL) {
 216                 ifnet_head_done();
 217                 return (ENOENT);
 218         }
 219         ifnet_reference(ifp);
 220         ifnet_head_done();
 221
 222         ifnet_lock_shared(ifp);
 223         error = make_ifmibdata(ifp, name, req);
 224         ifnet_lock_done(ifp);
 225
 226         ifnet_release(ifp);
 227
 228         return (error);
 229 }
 230
 231 int
 232 sysctl_ifalldata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 233 {
 234 #pragma unused(oidp)
 235         int *name = (int *)arg1;
 236         int error = 0;
 237         u_int namelen = arg2;
 238         struct ifnet *ifp;
 239
 240         if (namelen != 2)
 241                 return (EINVAL);
 242
 243         ifnet_head_lock_shared();
 244         TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
 245                 ifnet_lock_shared(ifp);
 246
 247                 error = make_ifmibdata(ifp, name, req);
 248
 249                 ifnet_lock_done(ifp);
 250                 if (error != 0)
 251                         break;
 252         }
 253         ifnet_head_done();
 254         return error;
 255 }