277 lines
7.6 KiB
C
277 lines
7.6 KiB
C
/*
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* Copyright (c) 2001-2003
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* Fraunhofer Institute for Open Communication Systems (FhG Fokus).
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* All rights reserved.
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*
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* Author: Harti Brandt <harti@freebsd.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT 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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* $Begemot: bsnmp/snmp_mibII/mibII.h,v 1.16 2006/02/14 09:04:19 brandt_h Exp $
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*
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* Implementation of the interfaces and IP groups of MIB-II.
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*/
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#include <sys/param.h>
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#include <sys/sysctl.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/syslog.h>
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#include <sys/time.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <err.h>
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#include <ctype.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/route.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "asn1.h"
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#include "snmp.h"
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#include "snmpmod.h"
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#include "snmp_mibII.h"
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#include "mibII_tree.h"
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/* maximum size of interface alias unless overridden with net.ifdescr_maxlen */
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#define MIBIF_ALIAS_SIZE (64 + 1)
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#define MIBIF_ALIAS_SIZE_MAX 1024
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/*
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* Interface list and flags.
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*/
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TAILQ_HEAD(mibif_list, mibif);
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enum {
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MIBIF_FOUND = 0x0001,
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MIBIF_HIGHSPEED = 0x0002,
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MIBIF_VERYHIGHSPEED = 0x0004,
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};
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/*
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* Private mibif data - hang off from the mibif.
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*/
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struct mibif_private {
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uint64_t hc_inoctets;
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uint64_t hc_outoctets;
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uint64_t hc_omcasts;
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uint64_t hc_opackets;
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uint64_t hc_imcasts;
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uint64_t hc_ipackets;
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};
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#define MIBIF_PRIV(IFP) ((struct mibif_private *)((IFP)->private))
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/*
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* Interface addresses.
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*/
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TAILQ_HEAD(mibifa_list, mibifa);
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enum {
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MIBIFA_FOUND = 0x0001,
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MIBIFA_DESTROYED = 0x0002,
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};
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/*
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* Receive addresses
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*/
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TAILQ_HEAD(mibrcvaddr_list, mibrcvaddr);
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enum {
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MIBRCVADDR_FOUND = 0x00010000,
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};
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/*
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* Interface index mapping. The problem here is, that if the same interface
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* is reinstantiated (for examble by unloading and loading the hardware driver)
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* we must use the same index for this interface. For dynamic interfaces
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* (clip, lane) we must use a fresh index, each time a new interface is created.
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* To differentiate between these types of interfaces we use the following table
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* which contains an entry for each dynamic interface type. All other interface
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* types are supposed to be static. The mibindexmap contains an entry for
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* all interfaces. The mibif pointer is NULL, if the interface doesn't exist
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* anymore.
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*/
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struct mibdynif {
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SLIST_ENTRY(mibdynif) link;
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char name[IFNAMSIZ];
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};
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SLIST_HEAD(mibdynif_list, mibdynif);
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struct mibindexmap {
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STAILQ_ENTRY(mibindexmap) link;
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u_short sysindex;
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u_int ifindex;
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struct mibif *mibif; /* may be NULL */
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char name[IFNAMSIZ];
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};
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STAILQ_HEAD(mibindexmap_list, mibindexmap);
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/*
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* Interface stacking. The generic code cannot know how the interfaces stack.
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* For this reason it instantiates only the x.0 and 0.x table elements. All
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* others have to be instantiated by the interface specific modules.
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* The table is read-only.
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*/
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struct mibifstack {
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TAILQ_ENTRY(mibifstack) link;
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struct asn_oid index;
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};
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TAILQ_HEAD(mibifstack_list, mibifstack);
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/*
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* NetToMediaTable (ArpTable)
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*/
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struct mibarp {
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TAILQ_ENTRY(mibarp) link;
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struct asn_oid index; /* contains both the ifindex and addr */
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u_char phys[128]; /* the physical address */
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u_int physlen; /* and its length */
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u_int flags;
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};
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TAILQ_HEAD(mibarp_list, mibarp);
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enum {
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MIBARP_FOUND = 0x00010000,
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MIBARP_PERM = 0x00000001,
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};
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/*
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* New if registrations
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*/
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struct newifreg {
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TAILQ_ENTRY(newifreg) link;
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const struct lmodule *mod;
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int (*func)(struct mibif *);
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};
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TAILQ_HEAD(newifreg_list, newifreg);
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/* list of all IP addresses */
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extern struct mibifa_list mibifa_list;
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/* list of all interfaces */
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extern struct mibif_list mibif_list;
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/* list of dynamic interface names */
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extern struct mibdynif_list mibdynif_list;
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/* list of all interface index mappings */
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extern struct mibindexmap_list mibindexmap_list;
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/* list of all stacking entries */
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extern struct mibifstack_list mibifstack_list;
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/* list of all receive addresses */
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extern struct mibrcvaddr_list mibrcvaddr_list;
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/* list of all NetToMedia entries */
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extern struct mibarp_list mibarp_list;
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/* number of interfaces */
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extern int32_t mib_if_number;
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/* last change of interface table */
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extern uint64_t mib_iftable_last_change;
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/* last change of stack table */
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extern uint64_t mib_ifstack_last_change;
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/* if this is set, one of our lists may be bad. refresh them when idle */
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extern int mib_iflist_bad;
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/* last time refreshed */
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extern uint64_t mibarpticks;
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/* info on system clocks */
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extern struct clockinfo clockinfo;
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/* baud rate of fastest interface */
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extern uint64_t mibif_maxspeed;
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/* user-forced update interval */
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extern u_int mibif_force_hc_update_interval;
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/* current update interval */
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extern u_int mibif_hc_update_interval;
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/* re-compute update interval */
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void mibif_reset_hc_timer(void);
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/* interfaces' data poll interval */
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extern u_int mibII_poll_ticks;
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/* restart the data poll timer */
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void mibif_restart_mibII_poll_timer(void);
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#define MIBII_POLL_TICKS 100
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/* get interfaces and interface addresses. */
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void mib_fetch_interfaces(void);
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/* check whether this interface(type) is dynamic */
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int mib_if_is_dyn(const char *name);
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/* destroy an interface address */
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int mib_destroy_ifa(struct mibifa *);
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/* restituate a deleted interface address */
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void mib_undestroy_ifa(struct mibifa *);
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/* change interface address */
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int mib_modify_ifa(struct mibifa *);
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/* undo if address modification */
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void mib_unmodify_ifa(struct mibifa *);
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/* create an interface address */
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struct mibifa * mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask, struct in_addr bcast);
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/* delete a freshly created address */
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void mib_uncreate_ifa(struct mibifa *);
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/* create/delete arp entries */
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struct mibarp *mib_arp_create(const struct mibif *, struct in_addr, const u_char *, size_t);
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void mib_arp_delete(struct mibarp *);
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/* find arp entry */
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struct mibarp *mib_find_arp(const struct mibif *, struct in_addr);
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/* update arp table */
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void mib_arp_update(void);
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/* fetch routing table */
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u_char *mib_fetch_rtab(int af, int info, int arg, size_t *lenp);
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/* process routing message */
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void mib_sroute_process(struct rt_msghdr *, struct sockaddr *,
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struct sockaddr *, struct sockaddr *);
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/* send a routing message */
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void mib_send_rtmsg(struct rt_msghdr *, struct sockaddr *,
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struct sockaddr *, struct sockaddr *);
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/* extract addresses from routing message */
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void mib_extract_addrs(int, u_char *, struct sockaddr **);
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/* fetch routing table */
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int mib_fetch_route(void);
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