diff options
author | wollman <wollman@FreeBSD.org> | 1996-07-30 19:17:07 +0000 |
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committer | wollman <wollman@FreeBSD.org> | 1996-07-30 19:17:07 +0000 |
commit | 50a3e4ed9e414f69f86253ea0bf631d402af6571 (patch) | |
tree | 4f7f2207dece54c4dfd55fd09f5b29f637e49009 /sys/net/if_mib.c | |
parent | f05fb79839f2c2e939d63287e153b80b22336408 (diff) | |
download | FreeBSD-src-50a3e4ed9e414f69f86253ea0bf631d402af6571.zip FreeBSD-src-50a3e4ed9e414f69f86253ea0bf631d402af6571.tar.gz |
Add better support for retrieving management information from network
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.
Diffstat (limited to 'sys/net/if_mib.c')
-rw-r--r-- | sys/net/if_mib.c | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/sys/net/if_mib.c b/sys/net/if_mib.c new file mode 100644 index 0000000..bb14745 --- /dev/null +++ b/sys/net/if_mib.c @@ -0,0 +1,150 @@ +/* + * 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. + * + * $Id$ + */ + +#include <sys/param.h> +#include <sys/queue.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/errno.h> +#include <sys/sysctl.h> + +#include <net/if.h> +#include <net/if_dl.h> +#include <net/if_mib.h> +#include <net/if_types.h> + +/* + * 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_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 = sprintf(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"); + |