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: releng/10.1/sys/net/if_mib.c 227309 2011-11-07 15:43:11Z ed $
   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 #include <net/vnet.h>
   41 
   42 /*
   43  * A sysctl(3) MIB for generic interface information.  This information
   44  * is exported in the net.link.generic branch, which has the following
   45  * structure:
   46  *
   47  * net.link.generic     .system                 - system-wide control variables
   48  *                                                and statistics (node)
   49  *                      .ifdata.<ifindex>.general
   50  *                                              - what's in `struct ifdata'
   51  *                                                plus some other info
   52  *                      .ifdata.<ifindex>.linkspecific
   53  *                                              - a link-type-specific data
   54  *                                                structure (as might be used
   55  *                                                by an SNMP agent
   56  *
   57  * Perhaps someday we will make addresses accessible via this interface
   58  * as well (then there will be four such...).  The reason that the
   59  * index comes before the last element in the name is because it
   60  * seems more orthogonal that way, particularly with the possibility
   61  * of other per-interface data living down here as well (e.g., integrated
   62  * services stuff).
   63  */
   64 
   65 SYSCTL_DECL(_net_link_generic);
   66 static SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
   67             "Variables global to all interfaces");
   68 
   69 SYSCTL_VNET_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
   70             &VNET_NAME(if_index), 0,
   71              "Number of configured interfaces");
   72 
   73 static int
   74 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
   75 {
   76         int *name = (int *)arg1;
   77         int error;
   78         u_int namelen = arg2;
   79         struct ifnet *ifp;
   80         struct ifmibdata ifmd;
   81         size_t dlen;
   82         char *dbuf;
   83 
   84         if (namelen != 2)
   85                 return EINVAL;
   86         if (name[0] <= 0)
   87                 return (ENOENT);
   88         ifp = ifnet_byindex_ref(name[0]);
   89         if (ifp == NULL)
   90                 return (ENOENT);
   91 
   92         switch(name[1]) {
   93         default:
   94                 error = ENOENT;
   95                 goto out;
   96 
   97         case IFDATA_GENERAL:
   98                 bzero(&ifmd, sizeof(ifmd));
   99                 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
  100 
  101 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
  102                 COPY(pcount);
  103                 COPY(data);
  104 #undef COPY
  105                 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
  106                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
  107                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
  108                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
  109 
  110                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
  111                 if (error || !req->newptr)
  112                         goto out;
  113 
  114                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
  115                 if (error)
  116                         goto out;
  117 
  118 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
  119                 DONTCOPY(type);
  120                 DONTCOPY(physical);
  121                 DONTCOPY(addrlen);
  122                 DONTCOPY(hdrlen);
  123                 DONTCOPY(mtu);
  124                 DONTCOPY(metric);
  125                 DONTCOPY(baudrate);
  126 #undef DONTCOPY
  127 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
  128                 COPY(data);
  129                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
  130                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
  131 #undef COPY
  132                 break;
  133 
  134         case IFDATA_LINKSPECIFIC:
  135                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
  136                 if (error || !req->newptr)
  137                         goto out;
  138 
  139                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
  140                 if (error)
  141                         goto out;
  142                 break;
  143 
  144         case IFDATA_DRIVERNAME:
  145                 /* 20 is enough for 64bit ints */
  146                 dlen = strlen(ifp->if_dname) + 20 + 1;
  147                 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL) {
  148                         error = ENOMEM;
  149                         goto out;
  150                 }
  151                 if (ifp->if_dunit == IF_DUNIT_NONE)
  152                         strcpy(dbuf, ifp->if_dname);
  153                 else
  154                         sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
  155 
  156                 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
  157                 if (error == 0 && req->newptr != NULL)
  158                         error = EPERM;
  159                 free(dbuf, M_TEMP);
  160                 goto out;
  161         }
  162 out:
  163         if_rele(ifp);
  164         return error;
  165 }
  166 
  167 static SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
  168             sysctl_ifdata, "Interface table");
  169 

Cache object: 13a735f71f58d139f7c407cda85e6f31


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