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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: src/sys/net/if_mib.c,v 1.15.2.2 2006/01/26 07:46:28 harti Exp $
   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;
   75         u_int namelen = arg2;
   76         struct ifnet *ifp;
   77         struct ifmibdata ifmd;
   78         size_t dlen;
   79         char *dbuf;
   80 
   81         if (namelen != 2)
   82                 return EINVAL;
   83 
   84         if (name[0] <= 0 || name[0] > if_index ||
   85             ifaddr_byindex(name[0]) == NULL)
   86                 return ENOENT;
   87 
   88         ifp = ifaddr_byindex(name[0])->ifa_ifp;
   89 
   90         switch(name[1]) {
   91         default:
   92                 return ENOENT;
   93 
   94         case IFDATA_GENERAL:
   95                 bzero(&ifmd, sizeof(ifmd));
   96                 strlcpy(ifmd.ifmd_name, ifp->if_xname, sizeof(ifmd.ifmd_name));
   97 
   98 #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
   99                 COPY(pcount);
  100                 COPY(data);
  101 #undef COPY
  102                 ifmd.ifmd_flags = ifp->if_flags | ifp->if_drv_flags;
  103                 ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
  104                 ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
  105                 ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
  106 
  107                 error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
  108                 if (error || !req->newptr)
  109                         return error;
  110 
  111                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
  112                 if (error)
  113                         return error;
  114 
  115 #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
  116                 DONTCOPY(type);
  117                 DONTCOPY(physical);
  118                 DONTCOPY(addrlen);
  119                 DONTCOPY(hdrlen);
  120                 DONTCOPY(mtu);
  121                 DONTCOPY(metric);
  122                 DONTCOPY(baudrate);
  123 #undef DONTCOPY
  124 #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
  125                 COPY(data);
  126                 ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
  127                 ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
  128 #undef COPY
  129                 break;
  130 
  131         case IFDATA_LINKSPECIFIC:
  132                 error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
  133                 if (error || !req->newptr)
  134                         return error;
  135 
  136                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
  137                 if (error)
  138                         return error;
  139 
  140         case IFDATA_DRIVERNAME:
  141                 /* 20 is enough for 64bit ints */
  142                 dlen = strlen(ifp->if_dname) + 20 + 1;
  143                 if ((dbuf = malloc(dlen, M_TEMP, M_NOWAIT)) == NULL)
  144                         return (ENOMEM);
  145                 if (ifp->if_dunit == IF_DUNIT_NONE)
  146                         strcpy(dbuf, ifp->if_dname);
  147                 else
  148                         sprintf(dbuf, "%s%d", ifp->if_dname, ifp->if_dunit);
  149 
  150                 error = SYSCTL_OUT(req, dbuf, strlen(dbuf) + 1);
  151                 if (error == 0 && req->newptr != NULL)
  152                         error = EPERM;
  153                 free(dbuf, M_TEMP);
  154                 return (error);
  155                 
  156         }
  157         return 0;
  158 }
  159 
  160 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
  161             sysctl_ifdata, "Interface table");
  162 

Cache object: 126118c04a752048756dd35e5d0ebc8a


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