The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/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/malloc.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 #include <net/vnet.h>
   43 
   44 /*
   45  * A sysctl(3) MIB for generic interface information.  This information
   46  * is exported in the net.link.generic branch, which has the following
   47  * structure:
   48  *
   49  * net.link.generic     .system                 - system-wide control variables
   50  *                                                and statistics (node)
   51  *                      .ifdata.<ifindex>.general
   52  *                                              - what's in `struct ifdata'
   53  *                                                plus some other info
   54  *                      .ifdata.<ifindex>.linkspecific
   55  *                                              - a link-type-specific data
   56  *                                                structure (as might be used
   57  *                                                by an SNMP agent
   58  *
   59  * Perhaps someday we will make addresses accessible via this interface
   60  * as well (then there will be four such...).  The reason that the
   61  * index comes before the last element in the name is because it
   62  * seems more orthogonal that way, particularly with the possibility
   63  * of other per-interface data living down here as well (e.g., integrated
   64  * services stuff).
   65  */
   66 
   67 SYSCTL_DECL(_net_link_generic);
   68 static SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
   69             "Variables global to all interfaces");
   70 
   71 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount,
   72         CTLFLAG_VNET | CTLFLAG_RD, &VNET_NAME(if_index), 0,
   73         "Number of configured interfaces");
   74 
   75 static int
   76 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
   77 {
   78         int *name = (int *)arg1;
   79         int error;
   80         u_int namelen = arg2;
   81         struct ifnet *ifp;
   82         struct ifmibdata ifmd;
   83         size_t dlen;
   84         char *dbuf;
   85 
   86         if (namelen != 2)
   87                 return EINVAL;
   88         if (name[0] <= 0)
   89                 return (ENOENT);
   90         ifp = ifnet_byindex_ref(name[0]);
   91         if (ifp == NULL)
   92                 return (ENOENT);
   93 
   94         switch(name[1]) {
   95         default:
   96                 error = ENOENT;
   97                 goto out;
   98 
   99         case IFDATA_GENERAL:
  100                 bzero(&ifmd, sizeof(ifmd));
  101                 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
  102 
  103                 ifmd.ifmd_pcount = ifp->if_pcount;
  104                 if_data_copy(ifp, &ifmd.ifmd_data);
  105 
  106                 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
  107                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
  108                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
  109                 ifmd.ifmd_snd_drops =
  110                     ifp->if_get_counter(ifp, IFCOUNTER_OQDROPS);
  111 
  112                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
  113                 if (error)
  114                         goto out;
  115                 break;
  116 
  117         case IFDATA_LINKSPECIFIC:
  118                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
  119                 if (error || !req->newptr)
  120                         goto out;
  121 
  122                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
  123                 if (error)
  124                         goto out;
  125                 break;
  126 
  127         case IFDATA_DRIVERNAME:
  128                 /* 20 is enough for 64bit ints */
  129                 dlen = strlen(ifp->if_dname) + 20 + 1;
  130                 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
  131                         error = ENOMEM;
  132                         goto out;
  133                 }
  134                 if (ifp->if_dunit == IF_DUNIT_NONE)
  135                         strcpy(dbuf, ifp->if_dname);
  136                 else
  137                         sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
  138 
  139                 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
  140                 if (error == 0 && req->newptr != NULL)
  141                         error = EPERM;
  142                 free(dbuf, M_TEMP);
  143                 goto out;
  144         }
  145 out:
  146         if_rele(ifp);
  147         return error;
  148 }
  149 
  150 static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
  151             sysctl_ifdata, "Interface table");
  152 

Cache object: bea287a4fe3a7f868763bf8cd107d7c9


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