bsd/net/if_mib.c

   1 /*
   2  * Copyright (c) 2000-2010 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 #if NETMIBS
  71
  72 /*
  73  * A sysctl(3) MIB for generic interface information.  This information
  74  * is exported in the net.link.generic branch, which has the following
  75  * structure:
  76  *
  77  * net.link.generic     .system                 - system-wide control variables
  78  *                                                and statistics (node)
  79  *                      .ifdata.<ifindex>.general
  80  *                                              - what's in `struct ifdata'
  81  *                                                plus some other info
  82  *                      .ifdata.<ifindex>.linkspecific
  83  *                                              - a link-type-specific data
  84  *                                                structure (as might be used
  85  *                                                by an SNMP agent
  86  *
  87  * Perhaps someday we will make addresses accessible via this interface
  88  * as well (then there will be four such...).  The reason that the
  89  * index comes before the last element in the name is because it
  90  * seems more orthogonal that way, particularly with the possibility
  91  * of other per-interface data living down here as well (e.g., integrated
  92  * services stuff).
  93  */
  94
  95 SYSCTL_DECL(_net_link_generic);
  96
  97 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RD|CTLFLAG_LOCKED, 0,
  98             "Variables global to all interfaces");
  99
 100 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
 101            &if_index, 0, "Number of configured interfaces");
 102
 103 static int sysctl_ifdata SYSCTL_HANDLER_ARGS;
 104 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RD,
 105             sysctl_ifdata, "Interface table");
 106
 107 static int sysctl_ifalldata SYSCTL_HANDLER_ARGS;
 108 SYSCTL_NODE(_net_link_generic, IFMIB_IFALLDATA, ifalldata, CTLFLAG_RD,
 109             sysctl_ifalldata, "Interface table");
 110
 111 extern int dlil_multithreaded_input;
 112 SYSCTL_INT(_net_link_generic_system, OID_AUTO, multi_threaded_input, CTLFLAG_RW,
 113                     &dlil_multithreaded_input , 0, "Uses multiple input thread for DLIL input");
 114 #ifdef IFNET_INPUT_SANITY_CHK
 115 extern int dlil_input_sanity_check;
 116 SYSCTL_INT(_net_link_generic_system, OID_AUTO, dlil_input_sanity_check, CTLFLAG_RW,
 117                     &dlil_input_sanity_check , 0, "Turn on sanity checking in DLIL input");
 118 #endif
 119
 120 extern int dlil_verbose;
 121 SYSCTL_INT(_net_link_generic_system, OID_AUTO, dlil_verbose, CTLFLAG_RW,
 122            &dlil_verbose, 0, "Log DLIL error messages");
 123
 124
 125 static int make_ifmibdata(struct ifnet *, int *, struct sysctl_req *);
 126
 127 int
 128 make_ifmibdata(struct ifnet *ifp, int *name, struct sysctl_req *req)
 129 {
 130         struct ifmibdata        ifmd;
 131         int error = 0;
 132
 133         switch(name[1]) {
 134         default:
 135                 error = ENOENT;
 136                 break;
 137
 138         case IFDATA_GENERAL:
 139                 bzero(&ifmd, sizeof(ifmd));
 140                 /*
 141                  * Make sure the interface is in use
 142                  */
 143                 if (ifp->if_refcnt > 0) {
 144                         snprintf(ifmd.ifmd_name, sizeof(ifmd.ifmd_name), "%s%d",
 145                                 ifp->if_name, ifp->if_unit);
 146
 147 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 148                         COPY(pcount);
 149                         COPY(flags);
 150                         if_data_internal_to_if_data64(ifp, &ifp->if_data, &ifmd.ifmd_data);
 151 #undef COPY
 152                         ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
 153                         ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
 154                         ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
 155                 }
 156                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 157                 if (error || !req->newptr)
 158                         break;
 159
 160 #ifdef IF_MIB_WR
 161                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 162                 if (error)
 163                         break;
 164
 165 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 166                 DONTCOPY(type);
 167                 DONTCOPY(physical);
 168                 DONTCOPY(addrlen);
 169                 DONTCOPY(hdrlen);
 170                 DONTCOPY(mtu);
 171                 DONTCOPY(metric);
 172                 DONTCOPY(baudrate);
 173 #undef DONTCOPY
 174 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 175                 COPY(data);
 176                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 177                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 178 #undef COPY
 179 #endif /* IF_MIB_WR */
 180                 break;
 181
 182         case IFDATA_LINKSPECIFIC:
 183                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 184                 if (error || !req->newptr)
 185                         break;
 186
 187 #ifdef IF_MIB_WR
 188                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 189                 if (error)
 190                         break;
 191 #endif /* IF_MIB_WR */
 192                 break;
 193
 194 #if PKT_PRIORITY
 195         case IFDATA_SUPPLEMENTAL:
 196                 error = SYSCTL_OUT(req, &ifp->if_tc, sizeof(struct if_traffic_class));
 197                 break;
 198 #endif /* PKT_PRIORITY */
 199         }
 200
 201         return error;
 202 }
 203
 204 int
 205 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 206 {
 207 #pragma unused(oidp)
 208         int *name = (int *)arg1;
 209         int error = 0;
 210         u_int namelen = arg2;
 211         struct ifnet *ifp;
 212
 213         if (namelen != 2)
 214                 return EINVAL;
 215         ifnet_head_lock_shared();
 216         if (name[0] <= 0 || name[0] > if_index ||
 217             (ifp = ifindex2ifnet[name[0]]) == NULL ||
 218             ifp->if_refcnt == 0) {
 219                 ifnet_head_done();
 220                 return ENOENT;
 221         }
 222         ifnet_head_done();
 223
 224         ifnet_lock_shared(ifp);
 225
 226         error = make_ifmibdata(ifp, name, req);
 227
 228         ifnet_lock_done(ifp);
 229
 230         return error;
 231 }
 232
 233 int
 234 sysctl_ifalldata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 235 {
 236 #pragma unused(oidp)
 237         int *name = (int *)arg1;
 238         int error = 0;
 239         u_int namelen = arg2;
 240         struct ifnet *ifp;
 241
 242         if (namelen != 2)
 243                 return EINVAL;
 244
 245         ifnet_head_lock_shared();
 246         TAILQ_FOREACH(ifp, &ifnet_head, if_link) {
 247                 ifnet_lock_shared(ifp);
 248
 249                 error = make_ifmibdata(ifp, name, req);
 250
 251                 ifnet_lock_done(ifp);
 252                 if (error)
 253                         break;
 254         }
 255         ifnet_head_done();
 256         return error;
 257 }
 258
 259 #endif