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_mib.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 SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
  67             "Variables global to all interfaces");
  68 SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
  69            &if_index, 0, "Number of configured interfaces");
  70
  71 static int
  72 sysctl_ifdata(SYSCTL_HANDLER_ARGS) /* XXX bad syntax! */
  73 {
  74         int *name = (int *)arg1;
  75         int error;
  76         u_int namelen = arg2;
  77         struct ifnet *ifp;
  78         struct ifmibdata ifmd;
  79
  80         if (namelen != 2)
  81                 return EINVAL;
  82
  83         crit_enter();
  84         if (name[0] <= 0 || name[0] > if_index ||
  85             ifindex2ifnet[name[0]] == NULL) {
  86                 crit_exit();
  87                 return ENOENT;
  88         }
  89
  90         ifp = ifindex2ifnet[name[0]];
  91         crit_exit();
  92
  93         switch(name[1]) {
  94         default:
  95                 return ENOENT;
  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(flags);
 104                 COPY(data);
 105 #undef COPY
 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                         return error;
 113
 114                 error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
 115                 if (error)
 116                         return error;
 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                         return error;
 138
 139                 error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
 140                 if (error)
 141                         return error;
 142
 143         }
 144         return 0;
 145 }
 146
 147 SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
 148             sysctl_ifdata, "Interface table");
 149