sys/net/if_mib.c

   1 /*
   2  * Copyright 1996 Massachusetts Institute of Technology
   3  *
   4  * Permission to use, copy, modify, and distribute this software and
   5  * its documentation for any purpose and without fee is hereby
   6  * granted, provided that both the above copyright notice and this
   7  * permission notice appear in all copies, that both the above
   8  * copyright notice and this permission notice appear in all
   9  * supporting documentation, and that the name of M.I.T. not be used
  10  * in advertising or publicity pertaining to distribution of the
  11  * software without specific, written prior permission.  M.I.T. makes
  12  * no representations about the suitability of this software for any
  13  * purpose.  It is provided "as is" without express or implied
  14  * warranty.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
  17  * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
  18  * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
  20  * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  23  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  24  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  25  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  26  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
  30  * $DragonFly: src/sys/net/if_mib.c,v 1.7 2005/06/15 19:29:30 joerg Exp $
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/socket.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <net/if.h>
  40 #include <net/if_var.h>
  41 #include <net/if_mib.h>
  42
  43 /*
  44  * A sysctl(3) MIB for generic interface information.  This information
  45  * is exported in the net.link.generic branch, which has the following
  46  * structure:
  47  *
  48  * net.link.generic     .system                 - system-wide control variables
  49  *                                                and statistics (node)
  50  *                      .ifdata.<ifindex>.general
  51  *                                              - what's in `struct ifdata'
  52  *                                                plus some other info
  53  *                      .ifdata.<ifindex>.linkspecific
  54  *                                              - a link-type-specific data
  55  *                                                structure (as might be used
  56  *                                                by an SNMP agent
  57  *
  58  * Perhaps someday we will make addresses accessible via this interface
  59  * as well (then there will be four such...).  The reason that the
  60  * index comes before the last element in the name is because it
  61  * seems more orthogonal that way, particularly with the possibility
  62  * of other per-interface data living down here as well (e.g., integrated
  63  * services stuff).
  64  */
  65
  66 SYSCTL_DECL(_net_link_generic);
  67 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
  68             "Variables global to all interfaces");
  69 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
  70            &if_index, 0, "Number of configured interfaces");
  71
  72 static int
  73 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
  74 {
  75         int *name = (int *)arg1;
  76         int error;
  77         u_int namelen = arg2;
  78         struct ifnet *ifp;
  79         struct ifmibdata ifmd;
  80
  81         if (namelen != 2)
  82                 return EINVAL;
  83
  84         /*
  85          * Hold the ifnet lock while we are accessing the ifp
  86          * obtained through ifindex2ifnet.
  87          */
  88         ifnet_lock();
  89
  90         if (name[0] <= 0 || name[0] > if_index ||
  91             ifindex2ifnet[name[0]] == NULL) {
  92                 ifnet_unlock();
  93                 return ENOENT;
  94         }
  95
  96         ifp = ifindex2ifnet[name[0]];
  97
  98         switch(name[1]) {
  99         default:
 100                 ifnet_unlock();
 101                 return ENOENT;
 102
 103         case IFDATA_GENERAL:
 104                 bzero(&ifmd, sizeof(ifmd));
 105                 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
 106
 107 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
 108                 COPY(pcount);
 109                 COPY(flags);
 110                 COPY(data);
 111 #undef COPY
 112 #define COPY_DATA(name) IFNET_STAT_GET(ifp, name, ifmd.ifmd_data.ifi_##name)
 113                 COPY_DATA(ipackets);
 114                 COPY_DATA(ierrors);
 115                 COPY_DATA(opackets);
 116                 COPY_DATA(oerrors);
 117                 COPY_DATA(collisions);
 118                 COPY_DATA(ibytes);
 119                 COPY_DATA(obytes);
 120                 COPY_DATA(imcasts);
 121                 COPY_DATA(omcasts);
 122                 COPY_DATA(iqdrops);
 123                 COPY_DATA(noproto);
 124                 COPY_DATA(oqdrops);
 125 #undef COPY_DATA
 126
 127                 ifmd.ifmd_snd_maxlen = ifp->if_snd.altq_maxlen;
 128 #ifdef notyet
 129                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
 130                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
 131 #endif
 132
 133                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
 134                 if (error || !req->newptr) {
 135                         ifnet_unlock();
 136                         return error;
 137                 }
 138
 139                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 140                 if (error) {
 141                         ifnet_unlock();
 142                         return error;
 143                 }
 144
 145 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
 146                 DONTCOPY(type);
 147                 DONTCOPY(physical);
 148                 DONTCOPY(addrlen);
 149                 DONTCOPY(hdrlen);
 150                 DONTCOPY(mtu);
 151                 DONTCOPY(metric);
 152                 DONTCOPY(baudrate);
 153 #undef DONTCOPY
 154 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
 155                 COPY(data);
 156 #undef COPY
 157 #define COPY_DATA(name) IFNET_STAT_SET(ifp, name, ifmd.ifmd_data.ifi_##name)
 158                 COPY_DATA(ipackets);
 159                 COPY_DATA(ierrors);
 160                 COPY_DATA(opackets);
 161                 COPY_DATA(oerrors);
 162                 COPY_DATA(collisions);
 163                 COPY_DATA(ibytes);
 164                 COPY_DATA(obytes);
 165                 COPY_DATA(imcasts);
 166                 COPY_DATA(omcasts);
 167                 COPY_DATA(iqdrops);
 168                 COPY_DATA(noproto);
 169                 COPY_DATA(oqdrops);
 170 #undef COPY_DATA
 171
 172 #ifdef notyet
 173                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
 174                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
 175 #endif
 176                 break;
 177
 178         case IFDATA_LINKSPECIFIC:
 179                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
 180                 if (error || !req->newptr) {
 181                         ifnet_unlock();
 182                         return error;
 183                 }
 184
 185                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 186                 if (error) {
 187                         ifnet_unlock();
 188                         return error;
 189                 }
 190         }
 191
 192         ifnet_unlock();
 193         return 0;
 194 }
 195
 196 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
 197             sysctl_ifdata, "Interface table");
 198