bbd17bf8e1
interfaces. This creates two new tables in the net.link.generic branch of the MIB; one contains (essentially) `ifdata' structures, and the other contains a blob provided by the interface (and presumably used to implement link-layer-specific MIB variables). A number of things have been moved around in the `ifnet' and `ifdata' structures, so NEW VERSIONS OF ifconfig(8) AND routed(8) ARE REQUIRED. (A simple recompile is all that's necessary.) I have a sample program which uses this interface for those interested in making use of it.
151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/*
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* Copyright 1996 Massachusetts Institute of Technology
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*
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* Permission to use, copy, modify, and distribute this software and
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* its documentation for any purpose and without fee is hereby
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* granted, provided that both the above copyright notice and this
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* permission notice appear in all copies, that both the above
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* copyright notice and this permission notice appear in all
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* supporting documentation, and that the name of M.I.T. not be used
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* in advertising or publicity pertaining to distribution of the
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* software without specific, written prior permission. M.I.T. makes
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied
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* warranty.
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*
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* THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
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* ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
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* SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id$
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*/
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_dl.h>
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#include <net/if_mib.h>
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#include <net/if_types.h>
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/*
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* A sysctl(3) MIB for generic interface information. This information
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* is exported in the net.link.generic branch, which has the following
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* structure:
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*
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* net.link.generic .system - system-wide control variables
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* and statistics (node)
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* .ifdata.<ifindex>.general
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* - what's in `struct ifdata'
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* plus some other info
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* .ifdata.<ifindex>.linkspecific
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* - a link-type-specific data
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* structure (as might be used
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* by an SNMP agent
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*
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* Perhaps someday we will make addresses accessible via this interface
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* as well (then there will be four such...). The reason that the
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* index comes before the last element in the name is because it
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* seems more orthogonal that way, particularly with the possibility
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* of other per-interface data living down here as well (e.g., integrated
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* services stuff).
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*/
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SYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0,
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"Variables global to all interfaces");
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SYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD,
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&if_index, 0, "Number of configured interfaces");
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static int
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sysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */
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{
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int *name = (int *)arg1;
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int error, ifnlen;
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u_int namelen = arg2;
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struct ifnet *ifp;
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char workbuf[64];
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struct ifmibdata ifmd;
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if (namelen != 2)
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return EINVAL;
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if (name[0] <= 0 || name[0] > if_index)
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return ENOENT;
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ifp = ifnet_addrs[name[0] - 1]->ifa_ifp;
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switch(name[1]) {
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default:
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return ENOENT;
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case IFDATA_GENERAL:
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ifnlen = sprintf(workbuf, "%s%d", ifp->if_name, ifp->if_unit);
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if(ifnlen + 1 > sizeof ifmd.ifmd_name) {
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return ENAMETOOLONG;
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} else {
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strcpy(ifmd.ifmd_name, workbuf);
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}
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#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld
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COPY(pcount);
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COPY(flags);
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COPY(data);
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#undef COPY
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ifmd.ifmd_snd_len = ifp->if_snd.ifq_len;
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ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen;
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ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops;
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error = SYSCTL_OUT(req, &ifmd, sizeof ifmd);
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if (error || !req->newptr)
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return error;
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error = SYSCTL_IN(req, &ifmd, sizeof ifmd);
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if (error)
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return error;
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#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld
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DONTCOPY(type);
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DONTCOPY(physical);
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DONTCOPY(addrlen);
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DONTCOPY(hdrlen);
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DONTCOPY(mtu);
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DONTCOPY(metric);
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DONTCOPY(baudrate);
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#undef DONTCOPY
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#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld
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COPY(data);
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ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen;
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ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops;
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#undef COPY
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break;
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case IFDATA_LINKSPECIFIC:
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error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen);
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if (error || !req->newptr)
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return error;
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error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen);
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if (error)
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return error;
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}
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return 0;
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}
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SYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW,
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sysctl_ifdata, "Interface table");
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