if_mib.c revision 50477
117352Swollman/* 217352Swollman * Copyright 1996 Massachusetts Institute of Technology 317352Swollman * 417352Swollman * Permission to use, copy, modify, and distribute this software and 517352Swollman * its documentation for any purpose and without fee is hereby 617352Swollman * granted, provided that both the above copyright notice and this 717352Swollman * permission notice appear in all copies, that both the above 817352Swollman * copyright notice and this permission notice appear in all 917352Swollman * supporting documentation, and that the name of M.I.T. not be used 1017352Swollman * in advertising or publicity pertaining to distribution of the 1117352Swollman * software without specific, written prior permission. M.I.T. makes 1217352Swollman * no representations about the suitability of this software for any 1317352Swollman * purpose. It is provided "as is" without express or implied 1417352Swollman * warranty. 1517352Swollman * 1617352Swollman * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 1717352Swollman * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 1817352Swollman * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 1917352Swollman * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 2017352Swollman * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 2117352Swollman * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 2217352Swollman * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 2317352Swollman * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 2417352Swollman * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 2517352Swollman * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 2617352Swollman * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2717352Swollman * SUCH DAMAGE. 2817352Swollman * 2950477Speter * $FreeBSD: head/sys/net/if_mib.c 50477 1999-08-28 01:08:13Z peter $ 3017352Swollman */ 3117352Swollman 3217352Swollman#include <sys/param.h> 3317352Swollman#include <sys/systm.h> 3417352Swollman#include <sys/kernel.h> 3518892Sbde#include <sys/socket.h> 3617352Swollman#include <sys/sysctl.h> 3717352Swollman 3817352Swollman#include <net/if.h> 3917352Swollman#include <net/if_mib.h> 4017352Swollman 4117352Swollman/* 4217352Swollman * A sysctl(3) MIB for generic interface information. This information 4317352Swollman * is exported in the net.link.generic branch, which has the following 4417352Swollman * structure: 4517352Swollman * 4617352Swollman * net.link.generic .system - system-wide control variables 4717352Swollman * and statistics (node) 4817352Swollman * .ifdata.<ifindex>.general 4917352Swollman * - what's in `struct ifdata' 5017352Swollman * plus some other info 5117352Swollman * .ifdata.<ifindex>.linkspecific 5217352Swollman * - a link-type-specific data 5317352Swollman * structure (as might be used 5417352Swollman * by an SNMP agent 5517352Swollman * 5617352Swollman * Perhaps someday we will make addresses accessible via this interface 5717352Swollman * as well (then there will be four such...). The reason that the 5817352Swollman * index comes before the last element in the name is because it 5917352Swollman * seems more orthogonal that way, particularly with the possibility 6017352Swollman * of other per-interface data living down here as well (e.g., integrated 6117352Swollman * services stuff). 6217352Swollman */ 6317352Swollman 6444078SdfrSYSCTL_DECL(_net_link_generic); 6517352SwollmanSYSCTL_NODE(_net_link_generic, IFMIB_SYSTEM, system, CTLFLAG_RW, 0, 6617352Swollman "Variables global to all interfaces"); 6717352SwollmanSYSCTL_INT(_net_link_generic_system, IFMIB_IFCOUNT, ifcount, CTLFLAG_RD, 6817352Swollman &if_index, 0, "Number of configured interfaces"); 6917352Swollman 7017352Swollmanstatic int 7117352Swollmansysctl_ifdata SYSCTL_HANDLER_ARGS /* XXX bad syntax! */ 7217352Swollman{ 7317352Swollman int *name = (int *)arg1; 7417352Swollman int error, ifnlen; 7517352Swollman u_int namelen = arg2; 7617352Swollman struct ifnet *ifp; 7717352Swollman char workbuf[64]; 7817352Swollman struct ifmibdata ifmd; 7917352Swollman 8017352Swollman if (namelen != 2) 8117352Swollman return EINVAL; 8217352Swollman 8317352Swollman if (name[0] <= 0 || name[0] > if_index) 8417352Swollman return ENOENT; 8517352Swollman 8617352Swollman ifp = ifnet_addrs[name[0] - 1]->ifa_ifp; 8717352Swollman 8817352Swollman switch(name[1]) { 8917352Swollman default: 9017352Swollman return ENOENT; 9117352Swollman 9217352Swollman case IFDATA_GENERAL: 9341514Sarchie ifnlen = snprintf(workbuf, sizeof(workbuf), 9441514Sarchie "%s%d", ifp->if_name, ifp->if_unit); 9517352Swollman if(ifnlen + 1 > sizeof ifmd.ifmd_name) { 9617352Swollman return ENAMETOOLONG; 9717352Swollman } else { 9817352Swollman strcpy(ifmd.ifmd_name, workbuf); 9917352Swollman } 10017352Swollman 10117352Swollman#define COPY(fld) ifmd.ifmd_##fld = ifp->if_##fld 10217352Swollman COPY(pcount); 10317352Swollman COPY(flags); 10417352Swollman COPY(data); 10517352Swollman#undef COPY 10617352Swollman ifmd.ifmd_snd_len = ifp->if_snd.ifq_len; 10717352Swollman ifmd.ifmd_snd_maxlen = ifp->if_snd.ifq_maxlen; 10817352Swollman ifmd.ifmd_snd_drops = ifp->if_snd.ifq_drops; 10917352Swollman 11017352Swollman error = SYSCTL_OUT(req, &ifmd, sizeof ifmd); 11117352Swollman if (error || !req->newptr) 11217352Swollman return error; 11317352Swollman 11417352Swollman error = SYSCTL_IN(req, &ifmd, sizeof ifmd); 11517352Swollman if (error) 11617352Swollman return error; 11717352Swollman 11817352Swollman#define DONTCOPY(fld) ifmd.ifmd_data.ifi_##fld = ifp->if_data.ifi_##fld 11917352Swollman DONTCOPY(type); 12017352Swollman DONTCOPY(physical); 12117352Swollman DONTCOPY(addrlen); 12217352Swollman DONTCOPY(hdrlen); 12317352Swollman DONTCOPY(mtu); 12417352Swollman DONTCOPY(metric); 12517352Swollman DONTCOPY(baudrate); 12617352Swollman#undef DONTCOPY 12717352Swollman#define COPY(fld) ifp->if_##fld = ifmd.ifmd_##fld 12817352Swollman COPY(data); 12917352Swollman ifp->if_snd.ifq_maxlen = ifmd.ifmd_snd_maxlen; 13017352Swollman ifp->if_snd.ifq_drops = ifmd.ifmd_snd_drops; 13117352Swollman#undef COPY 13217352Swollman break; 13317352Swollman 13417352Swollman case IFDATA_LINKSPECIFIC: 13517352Swollman error = SYSCTL_OUT(req, ifp->if_linkmib, ifp->if_linkmiblen); 13617352Swollman if (error || !req->newptr) 13717352Swollman return error; 13817352Swollman 13917352Swollman error = SYSCTL_IN(req, ifp->if_linkmib, ifp->if_linkmiblen); 14017352Swollman if (error) 14117352Swollman return error; 14217352Swollman 14317352Swollman } 14417352Swollman return 0; 14517352Swollman} 14617352Swollman 14717352SwollmanSYSCTL_NODE(_net_link_generic, IFMIB_IFDATA, ifdata, CTLFLAG_RW, 14817352Swollman sysctl_ifdata, "Interface table"); 14917352Swollman 150