bsd/net/if_mib.c

   1 /*
   2  * Copyright (c) 2000-2009 Apple Computer, 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
  69 #if NETMIBS
  70
  71 /*
  72  * A sysctl(3) MIB for generic interface information.  This information
  73  * is exported in the net.link.generic branch, which has the following
  74  * structure:
  75  *
  76  * net.link.generic     .system                 - system-wide control variables
  77  *                                                and statistics (node)
  78  *                      .ifdata.<ifindex>.general
  79  *                                              - what's in `struct ifdata'
  80  *                                                plus some other info
  81  *                      .ifdata.<ifindex>.linkspecific
  82  *                                              - a link-type-specific data
  83  *                                                structure (as might be used
  84  *                                                by an SNMP agent
  85  *
  86  * Perhaps someday we will make addresses accessible via this interface
  87  * as well (then there will be four such...).  The reason that the
  88  * index comes before the last element in the name is because it
  89  * seems more orthogonal that way, particularly with the possibility
  90  * of other per-interface data living down here as well (e.g., integrated
  91  * services stuff).
  92  */
  93
  94 SYSCTL_DECL(_net_link_generic);
  95
  96 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RD|CTLFLAG_LOCKED, 0,
  97             "Variables global to all interfaces");
  98
  99 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
 100            &if_index, 0, "Number of configured interfaces");
 101
 102 static int sysctl_ifdata SYSCTL_HANDLER_ARGS;
 103 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RD,
 104             sysctl_ifdata, "Interface table");
 105
 106 static int sysctl_ifalldata SYSCTL_HANDLER_ARGS;
 107 SYSCTL_NODE(_net_link_generic, IFMIB_IFALLDATA, ifalldata, CTLFLAG_RD,
 108             sysctl_ifalldata, "Interface table");
 109
 110 extern int dlil_multithreaded_input;
 111 SYSCTL_INT(_net_link_generic_system, OID_AUTO, multi_threaded_input, CTLFLAG_RW,
 112                     &dlil_multithreaded_input , 0, "Uses multiple input thread for DLIL input");
 113 #ifdef IFNET_INPUT_SANITY_CHK
 114 extern int dlil_input_sanity_check;
 115 SYSCTL_INT(_net_link_generic_system, OID_AUTO, dlil_input_sanity_check, CTLFLAG_RW,
 116                     &dlil_input_sanity_check , 0, "Turn on sanity checking in DLIL input");
 117 #endif
 118
 119 extern int dlil_verbose;
 120 SYSCTL_INT(_net_link_generic_system, OID_AUTO, dlil_verbose, CTLFLAG_RW,
 121            &dlil_verbose, 0, "Log DLIL error messages");
 122
 123
 124 static int make_ifmibdata(struct ifnet *, int *, struct sysctl_req *);
 125
 126 int
 127 make_ifmibdata(struct ifnet *ifp, int *name, struct sysctl_req *req)
 128 {
 129         struct ifmibdata        ifmd;
 130         int error = 0;
 131
 132         switch(name[1]) {
 133         default:
 134                 error = ENOENT;
 135                 break;
 136
 137         case IFDATA_GENERAL:
 138                 bzero(&ifmd, sizeof(ifmd));
 139                 /*
 140                  * Make sure the interface is in use
 141                  */
 142                 if (ifp->if_refcnt > 0) {
 143                         snprintf(ifmd.ifmd_name, sizeof(ifmd.ifmd_name), "%s%d",
 144                                 ifp->if_name, ifp->if_unit);
 145
 146 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 147                         COPY(pcount);
 148                         COPY(flags);
 149                         if_data_internal_to_if_data64(ifp, &ifp->if_data, &ifmd.ifmd_data);
 150 #undef COPY
 151                         ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
 152                         ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
 153                         ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
 154 #if PKT_PRIORITY
 155                         /* stuff these into unused fields for now */
 156                         ifmd.ifmd_filler[0] = ifp->if_obgpackets;
 157                         ifmd.ifmd_filler[1] = ifp->if_obgbytes;
 158 #endif /* PKT_PRIORITY */
 159                 }
 160                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 161                 if (error || !req->newptr)
 162                         break;
 163
 164 #ifdef IF_MIB_WR
 165                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 166                 if (error)
 167                         break;
 168
 169 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 170                 DONTCOPY(type);
 171                 DONTCOPY(physical);
 172                 DONTCOPY(addrlen);
 173                 DONTCOPY(hdrlen);
 174                 DONTCOPY(mtu);
 175                 DONTCOPY(metric);
 176                 DONTCOPY(baudrate);
 177 #undef DONTCOPY
 178 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 179                 COPY(data);
 180                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 181                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 182 #undef COPY
 183 #endif /* IF_MIB_WR */
 184                 break;
 185
 186         case IFDATA_LINKSPECIFIC:
 187                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 188                 if (error || !req->newptr)
 189                         break;
 190
 191 #ifdef IF_MIB_WR
 192                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 193                 if (error)
 194                         break;
 195 #endif /* IF_MIB_WR */
 196                 break;
 197         }
 198
 199         return error;
 200 }
 201
 202 int
 203 sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
 204 {
 205 #pragma unused(oidp)
 206         int *name = (int *)arg1;
 207         int error = 0;
 208         u_int namelen = arg2;
 209         struct ifnet *ifp;
 210
 211         if (namelen != 2)
 212                 return EINVAL;
 213         ifnet_head_lock_shared();
 214         if (name[0] <= 0 || name[0] > if_index ||
 215             (ifp = ifindex2ifnet[name[0]]) == NULL ||
 216             ifp->if_refcnt == 0) {
 217                 ifnet_head_done();
 218                 return ENOENT;
 219         }
 220         ifnet_head_done();
 221
 222         ifnet_lock_shared(ifp);
 223
 224         error = make_ifmibdata(ifp, name, req);
 225
 226         ifnet_lock_done(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)
 251                         break;
 252         }
 253         ifnet_head_done();
 254         return error;
 255 }
 256
 257 #endif