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

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * Copyright 1996 Massachusetts Institute of Technology
     *
     * Permission to use, copy, modify, and distribute this software and
     * its documentation for any purpose and without fee is hereby
     * granted, provided that both the above copyright notice and this
     * permission notice appear in all copies, that both the above
     * copyright notice and this permission notice appear in all
     * supporting documentation, and that the name of M.I.T. not be used
     * in advertising or publicity pertaining to distribution of the
     * software without specific, written prior permission.  M.I.T. makes
     * no representations about the suitability of this software for any
     * purpose.  It is provided "as is" without express or implied
     * warranty.
     * 
     * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''.  M.I.T. DISCLAIMS
     * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
     * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
     * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
     * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
     * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     * $FreeBSD: src/sys/net/if_mib.c,v 1.8.2.1 2000/08/03 00:09:34 ps Exp $
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/socket.h>
    #include <sys/sysctl.h>
    
    #include <net/if.h>
    #include <net/if_mib.h>
    
    #if NETMIBS
    
    /*
     * A sysctl(3) MIB for generic interface information.  This information
     * is exported in the net.link.generic branch, which has the following
     * structure:
     *
     * net.link.generic     .system                 - system-wide control variables
     *                                                and statistics (node)
     *                      .ifdata.<ifindex>.general
     *                                              - what's in `struct ifdata'
     *                                                plus some other info
     *                      .ifdata.<ifindex>.linkspecific
     *                                              - a link-type-specific data
     *                                                structure (as might be used
     *                                                by an SNMP agent
     *
     * Perhaps someday we will make addresses accessible via this interface
     * as well (then there will be four such...).  The reason that the
     * index comes before the last element in the name is because it
     * seems more orthogonal that way, particularly with the possibility
     * of other per-interface data living down here as well (e.g., integrated
     * services stuff).
     */
    
    SYSCTL_DECL(_net_link_generic);
    SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
                "Variables global to all interfaces");
    SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
               &if_index, 0, "Number of configured interfaces");
    
    static int
    sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
    {
            int *name = (int *)arg1;
           int error, ifnlen;
           u_int namelen = arg2;
           struct ifnet *ifp;
           char workbuf[64];
           struct ifmibdata ifmd;
   
           if (namelen != 2)
                   return EINVAL;
   
           if (name[0] <= 0 || name[0] > if_index)
                   return ENOENT;
   
           ifp = ifnet_addrs[name[0] - 1]->ifa_ifp;
   
           switch(name[1]) {
           default:
                   return ENOENT;
   
           case IFDATA_GENERAL:
               /*
                   ifnlen = snprintf(workbuf, sizeof(workbuf),
                       "%s%d", ifp->if_name, ifp->if_unit);
                   if(ifnlen + 1 > sizeof ifmd.ifmd_name) {
                           return ENAMETOOLONG;
                   } else {
                           strcpy(ifmd.ifmd_name, workbuf);
                   }
               */
   
   #define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
                   COPY(pcount);
                   COPY(flags);
                   COPY(data);
   #undef COPY
                   ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
                   ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
                   ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
   
                   error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
                   if (error || !req->newptr)
                           return error;
   
                   error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
                   if (error)
                           return error;
   
   #define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
                   DONTCOPY(type);
                   DONTCOPY(physical);
                   DONTCOPY(addrlen);
                   DONTCOPY(hdrlen);
                   DONTCOPY(mtu);
                   DONTCOPY(metric);
                   DONTCOPY(baudrate);
   #undef DONTCOPY
   #define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
                   COPY(data);
                   ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
                   ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
   #undef COPY
                   break;
   
           case IFDATA_LINKSPECIFIC:
                   error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
                   if (error || !req->newptr)
                           return error;
   
                   error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
                   if (error)
                           return error;
                   
           }
           return 0;
   }
   
   SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
               sysctl_ifdata, "Interface table");
   
   #endif

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