if_mib.c

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    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  * $FreeBSD$
   30  */
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/kernel.h>
   35 #include <sys/socket.h>
   36 #include <sys/sysctl.h>
   37 
   38 #include <net/if.h>
   39 #include <net/if_mib.h>
   40 
   41 /*
   42  * A sysctl(3) MIB for generic interface information.  This information
   43  * is exported in the net.link.generic branch, which has the following
   44  * structure:
   45  *
   46  * net.link.generic     .system                 - system-wide control variables
   47  *                                                and statistics (node)
   48  *                      .ifdata.<ifindex>.general
   49  *                                              - what's in `struct ifdata'
   50  *                                                plus some other info
   51  *                      .ifdata.<ifindex>.linkspecific
   52  *                                              - a link-type-specific data
   53  *                                                structure (as might be used
   54  *                                                by an SNMP agent
   55  *
   56  * Perhaps someday we will make addresses accessible via this interface
   57  * as well (then there will be four such...).  The reason that the
   58  * index comes before the last element in the name is because it
   59  * seems more orthogonal that way, particularly with the possibility
   60  * of other per-interface data living down here as well (e.g., integrated
   61  * services stuff).
   62  */
   63 
   64 SYSCTL_DECL(_net_link_generic);
   65 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
   66             "Variables global to all interfaces");
   67 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
   68            &if_index, 0, "Number of configured interfaces");
   69 
   70 static int
   71 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
   72 {
   73         int *name = (int *)arg1;
   74         int error, ifnlen;
   75         u_int namelen = arg2;
   76         struct ifnet *ifp;
   77         char workbuf[64];
   78         struct ifmibdata ifmd;
   79 
   80         if (namelen != 2)
   81                 return EINVAL;
   82 
   83         if (name[0] <= 0 || name[0] > if_index ||
   84             ifnet_addrs[name[0] - 1] == NULL)
   85                 return ENOENT;
   86 
   87         ifp = ifnet_addrs[name[0] - 1]->ifa_ifp;
   88 
   89         switch(name[1]) {
   90         default:
   91                 return ENOENT;
   92 
   93         case IFDATA_GENERAL:
   94                 bzero(&ifmd, sizeof(ifmd));
   95                 ifnlen = snprintf(workbuf, sizeof(workbuf),
   96                     "%s%d", ifp->if_name, ifp->if_unit);
   97                 if(ifnlen + 1 > sizeof ifmd.ifmd_name) {
   98                         return ENAMETOOLONG;
   99                 } else {
  100                         strcpy(ifmd.ifmd_name, workbuf);
  101                 }
  102 
  103 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
  104                 COPY(pcount);
  105                 COPY(flags);
  106                 COPY(data);
  107 #undef COPY
  108                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
  109                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
  110                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
  111 
  112                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
  113                 if (error || !req->newptr)
  114                         return error;
  115 
  116                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
  117                 if (error)
  118                         return error;
  119 
  120 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
  121                 DONTCOPY(type);
  122                 DONTCOPY(physical);
  123                 DONTCOPY(addrlen);
  124                 DONTCOPY(hdrlen);
  125                 DONTCOPY(mtu);
  126                 DONTCOPY(metric);
  127                 DONTCOPY(baudrate);
  128 #undef DONTCOPY
  129 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
  130                 COPY(data);
  131                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
  132                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
  133 #undef COPY
  134                 break;
  135 
  136         case IFDATA_LINKSPECIFIC:
  137                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
  138                 if (error || !req->newptr)
  139                         return error;
  140 
  141                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
  142                 if (error)
  143                         return error;
  144                 
  145         }
  146         return 0;
  147 }
  148 
  149 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
  150             sysctl_ifdata, "Interface table");
  151

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FreeBSD/Linux Kernel Cross Reference sys/net/if_mib.c

FreeBSD/Linux Kernel Cross Reference
sys/net/if_mib.c