2 * Copyright (c) 2001-2003
3 * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
6 * Author: Harti Brandt <harti@freebsd.org>
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $Begemot: mibII.c 516 2006-10-27 15:54:02Z brandt_h $
31 * Implementation of the standard interfaces and ip MIB.
34 #include "mibII_oid.h"
36 #include <net/if_types.h>
39 /*****************************/
42 static struct lmodule *module;
46 static void *route_fd;
48 /* if-index allocator */
49 static uint32_t next_if_index = 1;
51 /* re-fetch arp table */
52 static int update_arp;
53 static int in_update_arp;
55 /* OR registrations */
56 static u_int ifmib_reg;
57 static u_int ipmib_reg;
58 static u_int tcpmib_reg;
59 static u_int udpmib_reg;
60 static u_int ipForward_reg;
62 /*****************************/
64 /* list of all IP addresses */
65 struct mibifa_list mibifa_list = TAILQ_HEAD_INITIALIZER(mibifa_list);
67 /* list of all interfaces */
68 struct mibif_list mibif_list = TAILQ_HEAD_INITIALIZER(mibif_list);
70 /* list of dynamic interface names */
71 struct mibdynif_list mibdynif_list = SLIST_HEAD_INITIALIZER(mibdynif_list);
73 /* list of all interface index mappings */
74 struct mibindexmap_list mibindexmap_list = STAILQ_HEAD_INITIALIZER(mibindexmap_list);
76 /* list of all stacking entries */
77 struct mibifstack_list mibifstack_list = TAILQ_HEAD_INITIALIZER(mibifstack_list);
79 /* list of all receive addresses */
80 struct mibrcvaddr_list mibrcvaddr_list = TAILQ_HEAD_INITIALIZER(mibrcvaddr_list);
82 /* list of all NetToMedia entries */
83 struct mibarp_list mibarp_list = TAILQ_HEAD_INITIALIZER(mibarp_list);
85 /* number of interfaces */
86 int32_t mib_if_number;
88 /* last change of table */
89 uint64_t mib_iftable_last_change;
91 /* last change of stack table */
92 uint64_t mib_ifstack_last_change;
94 /* if this is set, one of our lists may be bad. refresh them when idle */
100 /* last time refreshed */
101 uint64_t mibarpticks;
103 /* info on system clocks */
104 struct clockinfo clockinfo;
106 /* list of all New if registrations */
107 static struct newifreg_list newifreg_list = TAILQ_HEAD_INITIALIZER(newifreg_list);
109 /* baud rate of fastest interface */
110 uint64_t mibif_maxspeed;
112 /* user-forced update interval */
113 u_int mibif_force_hc_update_interval;
115 /* current update interval */
116 u_int mibif_hc_update_interval;
118 /* HC update timer handle */
119 static void *hc_update_timer;
121 /*****************************/
123 static const struct asn_oid oid_ifMIB = OIDX_ifMIB;
124 static const struct asn_oid oid_ipMIB = OIDX_ipMIB;
125 static const struct asn_oid oid_tcpMIB = OIDX_tcpMIB;
126 static const struct asn_oid oid_udpMIB = OIDX_udpMIB;
127 static const struct asn_oid oid_ipForward = OIDX_ipForward;
128 static const struct asn_oid oid_linkDown = OIDX_linkDown;
129 static const struct asn_oid oid_linkUp = OIDX_linkUp;
130 static const struct asn_oid oid_ifIndex = OIDX_ifIndex;
132 /*****************************/
138 mib_find_if(u_int idx)
142 TAILQ_FOREACH(ifp, &mibif_list, link)
143 if (ifp->index == idx)
149 mib_find_if_sys(u_int sysindex)
153 TAILQ_FOREACH(ifp, &mibif_list, link)
154 if (ifp->sysindex == sysindex)
160 mib_find_if_name(const char *name)
164 TAILQ_FOREACH(ifp, &mibif_list, link)
165 if (strcmp(ifp->name, name) == 0)
171 * Check whether an interface is dynamic. The argument may include the
172 * unit number. This assumes, that the name part does NOT contain digits.
175 mib_if_is_dyn(const char *name)
180 for (len = 0; name[len] != '\0' && isalpha(name[len]) ; len++)
182 SLIST_FOREACH(d, &mibdynif_list, link)
183 if (strlen(d->name) == len && strncmp(d->name, name, len) == 0)
188 /* set an interface name to dynamic mode */
190 mib_if_set_dyn(const char *name)
194 SLIST_FOREACH(d, &mibdynif_list, link)
195 if (strcmp(name, d->name) == 0)
197 if ((d = malloc(sizeof(*d))) == NULL)
199 strcpy(d->name, name);
200 SLIST_INSERT_HEAD(&mibdynif_list, d, link);
204 * register for interface creations
207 mib_register_newif(int (*func)(struct mibif *), const struct lmodule *mod)
209 struct newifreg *reg;
211 TAILQ_FOREACH(reg, &newifreg_list, link)
212 if (reg->mod == mod) {
216 if ((reg = malloc(sizeof(*reg))) == NULL) {
217 syslog(LOG_ERR, "newifreg: %m");
222 TAILQ_INSERT_TAIL(&newifreg_list, reg, link);
228 mib_unregister_newif(const struct lmodule *mod)
230 struct newifreg *reg;
232 TAILQ_FOREACH(reg, &newifreg_list, link)
233 if (reg->mod == mod) {
234 TAILQ_REMOVE(&newifreg_list, reg, link);
244 return (TAILQ_FIRST(&mibif_list));
247 mib_next_if(const struct mibif *ifp)
249 return (TAILQ_NEXT(ifp, link));
253 * Change the admin status of an interface
256 mib_if_admin(struct mibif *ifp, int up)
260 strncpy(ifr.ifr_name, ifp->name, sizeof(ifr.ifr_name));
261 if (ioctl(mib_netsock, SIOCGIFFLAGS, &ifr) == -1) {
262 syslog(LOG_ERR, "SIOCGIFFLAGS(%s): %m", ifp->name);
266 ifr.ifr_flags |= IFF_UP;
268 ifr.ifr_flags &= ~IFF_UP;
269 if (ioctl(mib_netsock, SIOCSIFFLAGS, &ifr) == -1) {
270 syslog(LOG_ERR, "SIOCSIFFLAGS(%s): %m", ifp->name);
274 (void)mib_fetch_ifmib(ifp);
280 * Generate a link up/down trap
283 link_trap(struct mibif *ifp, int up)
285 struct snmp_value ifindex;
287 ifindex.var = oid_ifIndex;
288 ifindex.var.subs[ifindex.var.len++] = ifp->index;
289 ifindex.syntax = SNMP_SYNTAX_INTEGER;
290 ifindex.v.integer = ifp->index;
292 snmp_send_trap(up ? &oid_linkUp : &oid_linkDown, &ifindex,
293 (struct snmp_value *)NULL);
297 * Fetch the GENERIC IFMIB and update the HC counters
300 fetch_generic_mib(struct mibif *ifp, const struct ifmibdata *old)
304 struct mibif_private *p = ifp->private;
308 name[2] = NETLINK_GENERIC;
309 name[3] = IFMIB_IFDATA;
310 name[4] = ifp->sysindex;
311 name[5] = IFDATA_GENERAL;
313 len = sizeof(ifp->mib);
314 if (sysctl(name, 6, &ifp->mib, &len, NULL, 0) == -1) {
316 syslog(LOG_WARNING, "sysctl(ifmib, %s) failed %m",
322 * Assume that one of the two following compounds is optimized away
324 if (ULONG_MAX >= 0xffffffffffffffffULL) {
325 p->hc_inoctets = ifp->mib.ifmd_data.ifi_ibytes;
326 p->hc_outoctets = ifp->mib.ifmd_data.ifi_obytes;
327 p->hc_omcasts = ifp->mib.ifmd_data.ifi_omcasts;
328 p->hc_opackets = ifp->mib.ifmd_data.ifi_opackets;
329 p->hc_imcasts = ifp->mib.ifmd_data.ifi_imcasts;
330 p->hc_ipackets = ifp->mib.ifmd_data.ifi_ipackets;
332 } else if (ULONG_MAX >= 0xffffffff) {
334 #define UPDATE(HC, MIB) \
335 if (old->ifmd_data.MIB > ifp->mib.ifmd_data.MIB) \
336 p->HC += (0x100000000ULL + \
337 ifp->mib.ifmd_data.MIB) - \
338 old->ifmd_data.MIB; \
340 p->HC += ifp->mib.ifmd_data.MIB - \
343 UPDATE(hc_inoctets, ifi_ibytes)
344 UPDATE(hc_outoctets, ifi_obytes)
345 UPDATE(hc_omcasts, ifi_omcasts)
346 UPDATE(hc_opackets, ifi_opackets)
347 UPDATE(hc_imcasts, ifi_imcasts)
348 UPDATE(hc_ipackets, ifi_ipackets)
357 * Update the 64-bit interface counters
360 update_hc_counters(void *arg __unused)
363 struct ifmibdata oldmib;
365 TAILQ_FOREACH(ifp, &mibif_list, link) {
367 (void)fetch_generic_mib(ifp, &oldmib);
372 * Recompute the poll timer for the HC counters
375 mibif_reset_hc_timer(void)
379 if ((ticks = mibif_force_hc_update_interval) == 0) {
380 if (mibif_maxspeed <= IF_Mbps(10)) {
381 /* at 10Mbps overflow needs 3436 seconds */
382 ticks = 3000 * 100; /* 50 minutes */
383 } else if (mibif_maxspeed <= IF_Mbps(100)) {
384 /* at 100Mbps overflow needs 343 seconds */
385 ticks = 300 * 100; /* 5 minutes */
386 } else if (mibif_maxspeed < IF_Mbps(622)) {
387 /* at 622Mbps overflow needs 53 seconds */
388 ticks = 40 * 100; /* 40 seconds */
389 } else if (mibif_maxspeed <= IF_Mbps(1000)) {
390 /* at 1Gbps overflow needs 34 seconds */
391 ticks = 20 * 100; /* 20 seconds */
393 /* at 10Gbps overflow needs 3.4 seconds */
394 ticks = 100; /* 1 seconds */
398 if (ticks == mibif_hc_update_interval)
401 if (hc_update_timer != NULL) {
402 timer_stop(hc_update_timer);
403 hc_update_timer = NULL;
405 update_hc_counters(NULL);
406 if ((hc_update_timer = timer_start_repeat(ticks * 10, ticks * 10,
407 update_hc_counters, NULL, module)) == NULL) {
408 syslog(LOG_ERR, "timer_start(%u): %m", ticks);
411 mibif_hc_update_interval = ticks;
415 * Fetch new MIB data.
418 mib_fetch_ifmib(struct mibif *ifp)
423 struct ifmibdata oldmib = ifp->mib;
425 if (fetch_generic_mib(ifp, &oldmib) == -1)
429 * Quoting RFC2863, 3.1.15: "... LinkUp and linkDown traps are
430 * generated just after ifOperStatus leaves, or just before it
431 * enters, the down state, respectively;"
433 if (ifp->trap_enable && ifp->mib.ifmd_data.ifi_link_state !=
434 oldmib.ifmd_data.ifi_link_state &&
435 (ifp->mib.ifmd_data.ifi_link_state == LINK_STATE_DOWN ||
436 oldmib.ifmd_data.ifi_link_state == LINK_STATE_DOWN))
437 link_trap(ifp, ifp->mib.ifmd_data.ifi_link_state ==
438 LINK_STATE_UP ? 1 : 0);
440 ifp->flags &= ~(MIBIF_HIGHSPEED | MIBIF_VERYHIGHSPEED);
441 if (ifp->mib.ifmd_data.ifi_baudrate > 20000000) {
442 ifp->flags |= MIBIF_HIGHSPEED;
443 if (ifp->mib.ifmd_data.ifi_baudrate > 650000000)
444 ifp->flags |= MIBIF_VERYHIGHSPEED;
446 if (ifp->mib.ifmd_data.ifi_baudrate > mibif_maxspeed) {
447 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate;
448 mibif_reset_hc_timer();
456 name[2] = NETLINK_GENERIC;
457 name[3] = IFMIB_IFDATA;
458 name[4] = ifp->sysindex;
459 name[5] = IFDATA_LINKSPECIFIC;
460 if (sysctl(name, 6, NULL, &len, NULL, 0) == -1) {
461 syslog(LOG_WARNING, "sysctl linkmib estimate (%s): %m",
463 if (ifp->specmib != NULL) {
470 if (ifp->specmib != NULL) {
477 if (ifp->specmiblen != len) {
478 if ((newmib = realloc(ifp->specmib, len)) == NULL) {
483 ifp->specmib = newmib;
484 ifp->specmiblen = len;
486 if (sysctl(name, 6, ifp->specmib, &len, NULL, 0) == -1) {
487 syslog(LOG_WARNING, "sysctl linkmib (%s): %m", ifp->name);
488 if (ifp->specmib != NULL) {
495 ifp->mibtick = get_ticks();
499 /* find first/next address for a given interface */
501 mib_first_ififa(const struct mibif *ifp)
505 TAILQ_FOREACH(ifa, &mibifa_list, link)
506 if (ifp->index == ifa->ifindex)
512 mib_next_ififa(struct mibifa *ifa0)
517 while ((ifa = TAILQ_NEXT(ifa, link)) != NULL)
518 if (ifa->ifindex == ifa0->ifindex)
526 static struct mibifa *
527 alloc_ifa(u_int ifindex, struct in_addr addr)
532 if ((ifa = malloc(sizeof(struct mibifa))) == NULL) {
533 syslog(LOG_ERR, "ifa: %m");
537 ifa->ifindex = ifindex;
539 ha = ntohl(ifa->inaddr.s_addr);
541 ifa->index.subs[0] = (ha >> 24) & 0xff;
542 ifa->index.subs[1] = (ha >> 16) & 0xff;
543 ifa->index.subs[2] = (ha >> 8) & 0xff;
544 ifa->index.subs[3] = (ha >> 0) & 0xff;
547 ifa->inbcast.s_addr = 0;
548 ifa->inmask.s_addr = 0xffffffff;
550 INSERT_OBJECT_OID(ifa, &mibifa_list);
556 * Delete an interface address
559 destroy_ifa(struct mibifa *ifa)
561 TAILQ_REMOVE(&mibifa_list, ifa, link);
567 * Helper routine to extract the sockaddr structures from a routing
571 mib_extract_addrs(int addrs, u_char *info, struct sockaddr **out)
575 for (i = 0; i < RTAX_MAX; i++) {
576 if ((addrs & (1 << i)) != 0) {
577 *out = (struct sockaddr *)(void *)info;
578 info += roundup((*out)->sa_len, sizeof(long));
586 * save the phys address of an interface. Handle receive address entries here.
589 get_physaddr(struct mibif *ifp, struct sockaddr_dl *sdl, u_char *ptr)
592 struct mibrcvaddr *rcv;
594 if (sdl->sdl_alen == 0) {
596 if (ifp->physaddrlen != 0) {
597 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr,
598 ifp->physaddrlen)) != NULL)
599 mib_rcvaddr_delete(rcv);
601 ifp->physaddr = NULL;
602 ifp->physaddrlen = 0;
607 if (ifp->physaddrlen != sdl->sdl_alen) {
609 if (ifp->physaddrlen) {
610 /* delete olf receive address */
611 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr,
612 ifp->physaddrlen)) != NULL)
613 mib_rcvaddr_delete(rcv);
615 if ((np = realloc(ifp->physaddr, sdl->sdl_alen)) == NULL) {
617 ifp->physaddr = NULL;
618 ifp->physaddrlen = 0;
622 ifp->physaddrlen = sdl->sdl_alen;
624 } else if (memcmp(ifp->physaddr, ptr, ifp->physaddrlen) == 0) {
629 /* address changed */
631 /* delete olf receive address */
632 if ((rcv = mib_find_rcvaddr(ifp->index, ifp->physaddr,
633 ifp->physaddrlen)) != NULL)
634 mib_rcvaddr_delete(rcv);
637 memcpy(ifp->physaddr, ptr, ifp->physaddrlen);
639 /* make new receive address */
640 if ((rcv = mib_rcvaddr_create(ifp, ifp->physaddr, ifp->physaddrlen)) != NULL)
641 rcv->flags |= MIBRCVADDR_HW;
648 mibif_free(struct mibif *ifp)
651 struct mibindexmap *map;
652 struct mibifa *ifa, *ifa1;
653 struct mibrcvaddr *rcv, *rcv1;
654 struct mibarp *at, *at1;
656 if (ifp->xnotify != NULL)
657 (*ifp->xnotify)(ifp, MIBIF_NOTIFY_DESTROY, ifp->xnotify_data);
659 (void)mib_ifstack_delete(ifp, NULL);
660 (void)mib_ifstack_delete(NULL, ifp);
662 TAILQ_REMOVE(&mibif_list, ifp, link);
664 /* if this was the fastest interface - recompute this */
665 if (ifp->mib.ifmd_data.ifi_baudrate == mibif_maxspeed) {
666 mibif_maxspeed = ifp->mib.ifmd_data.ifi_baudrate;
667 TAILQ_FOREACH(ifp1, &mibif_list, link)
668 if (ifp1->mib.ifmd_data.ifi_baudrate > mibif_maxspeed)
670 ifp1->mib.ifmd_data.ifi_baudrate;
671 mibif_reset_hc_timer();
675 if (ifp->physaddr != NULL)
677 if (ifp->specmib != NULL)
680 STAILQ_FOREACH(map, &mibindexmap_list, link)
681 if (map->mibif == ifp) {
686 /* purge interface addresses */
687 ifa = TAILQ_FIRST(&mibifa_list);
688 while (ifa != NULL) {
689 ifa1 = TAILQ_NEXT(ifa, link);
690 if (ifa->ifindex == ifp->index)
695 /* purge receive addresses */
696 rcv = TAILQ_FIRST(&mibrcvaddr_list);
697 while (rcv != NULL) {
698 rcv1 = TAILQ_NEXT(rcv, link);
699 if (rcv->ifindex == ifp->index)
700 mib_rcvaddr_delete(rcv);
704 /* purge ARP entries */
705 at = TAILQ_FIRST(&mibarp_list);
707 at1 = TAILQ_NEXT(at, link);
708 if (at->index.subs[0] == ifp->index)
716 mib_iftable_last_change = this_tick;
720 * Create a new interface
722 static struct mibif *
723 mibif_create(u_int sysindex, const char *name)
726 struct mibindexmap *map;
728 if ((ifp = malloc(sizeof(*ifp))) == NULL) {
729 syslog(LOG_WARNING, "%s: %m", __func__);
732 memset(ifp, 0, sizeof(*ifp));
733 if ((ifp->private = malloc(sizeof(struct mibif_private))) == NULL) {
734 syslog(LOG_WARNING, "%s: %m", __func__);
738 memset(ifp->private, 0, sizeof(struct mibif_private));
740 ifp->sysindex = sysindex;
741 strcpy(ifp->name, name);
742 strcpy(ifp->descr, name);
743 ifp->spec_oid = oid_zeroDotZero;
746 if (!mib_if_is_dyn(ifp->name)) {
747 /* non-dynamic. look whether we know the interface */
748 STAILQ_FOREACH(map, &mibindexmap_list, link)
749 if (strcmp(map->name, ifp->name) == 0) {
750 ifp->index = map->ifindex;
754 /* assume it has a connector if it is not dynamic */
755 ifp->has_connector = 1;
756 ifp->trap_enable = 1;
759 /* new interface - get new index */
760 if (next_if_index > 0x7fffffff)
761 errx(1, "ifindex wrap");
763 if ((map = malloc(sizeof(*map))) == NULL) {
764 syslog(LOG_ERR, "ifmap: %m");
768 map->ifindex = next_if_index++;
769 map->sysindex = ifp->sysindex;
770 strcpy(map->name, ifp->name);
772 STAILQ_INSERT_TAIL(&mibindexmap_list, map, link);
774 /* re-instantiate. Introduce a counter discontinuity */
775 ifp->counter_disc = get_ticks();
777 ifp->index = map->ifindex;
778 ifp->mib.ifmd_data.ifi_link_state = LINK_STATE_UNKNOWN;
780 INSERT_OBJECT_INT(ifp, &mibif_list);
782 mib_iftable_last_change = this_tick;
784 /* instantiate default ifStack entries */
785 (void)mib_ifstack_create(ifp, NULL);
786 (void)mib_ifstack_create(NULL, ifp);
792 * Inform all interested parties about a new interface
795 notify_newif(struct mibif *ifp)
797 struct newifreg *reg;
799 TAILQ_FOREACH(reg, &newifreg_list, link)
800 if ((*reg->func)(ifp))
805 * This is called for new interfaces after we have fetched the interface
806 * MIB. If this is a broadcast interface try to guess the broadcast address
807 * depending on the interface type.
810 check_llbcast(struct mibif *ifp)
812 static u_char ether_bcast[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
813 static u_char arcnet_bcast = 0;
814 struct mibrcvaddr *rcv;
816 if (!(ifp->mib.ifmd_flags & IFF_BROADCAST))
819 switch (ifp->mib.ifmd_data.ifi_type) {
824 if (mib_find_rcvaddr(ifp->index, ether_bcast, 6) == NULL &&
825 (rcv = mib_rcvaddr_create(ifp, ether_bcast, 6)) != NULL)
826 rcv->flags |= MIBRCVADDR_BCAST;
830 if (mib_find_rcvaddr(ifp->index, &arcnet_bcast, 1) == NULL &&
831 (rcv = mib_rcvaddr_create(ifp, &arcnet_bcast, 1)) != NULL)
832 rcv->flags |= MIBRCVADDR_BCAST;
839 * Retrieve the current interface list from the system.
842 mib_refresh_iflist(void)
844 struct mibif *ifp, *ifp1;
849 struct ifmibdata mib;
851 TAILQ_FOREACH(ifp, &mibif_list, link)
852 ifp->flags &= ~MIBIF_FOUND;
855 if (sysctlbyname("net.link.generic.system.ifcount", &count, &len,
857 syslog(LOG_ERR, "ifcount: %m");
862 name[2] = NETLINK_GENERIC;
863 name[3] = IFMIB_IFDATA;
864 name[5] = IFDATA_GENERAL;
865 for (idx = 1; idx <= count; idx++) {
868 if (sysctl(name, 6, &mib, &len, NULL, 0) == -1) {
871 syslog(LOG_ERR, "ifmib(%u): %m", idx);
874 if ((ifp = mib_find_if_sys(idx)) != NULL) {
875 ifp->flags |= MIBIF_FOUND;
878 /* Unknown interface - create */
879 if ((ifp = mibif_create(idx, mib.ifmd_name)) != NULL) {
880 ifp->flags |= MIBIF_FOUND;
881 (void)mib_fetch_ifmib(ifp);
888 * Purge interfaces that disappeared
890 ifp = TAILQ_FIRST(&mibif_list);
891 while (ifp != NULL) {
892 ifp1 = TAILQ_NEXT(ifp, link);
893 if (!(ifp->flags & MIBIF_FOUND))
900 * Find an interface address
903 mib_find_ifa(struct in_addr addr)
907 TAILQ_FOREACH(ifa, &mibifa_list, link)
908 if (ifa->inaddr.s_addr == addr.s_addr)
914 * Process a new ARP entry
917 process_arp(const struct rt_msghdr *rtm, const struct sockaddr_dl *sdl,
918 const struct sockaddr_in *sa)
923 /* IP arp table entry */
924 if (sdl->sdl_alen == 0) {
928 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL)
930 /* have a valid entry */
931 if ((at = mib_find_arp(ifp, sa->sin_addr)) == NULL &&
932 (at = mib_arp_create(ifp, sa->sin_addr,
933 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL)
936 if (rtm->rtm_rmx.rmx_expire == 0)
937 at->flags |= MIBARP_PERM;
939 at->flags &= ~MIBARP_PERM;
940 at->flags |= MIBARP_FOUND;
944 * Handle a routing socket message.
947 handle_rtmsg(struct rt_msghdr *rtm)
949 struct sockaddr *addrs[RTAX_MAX];
950 struct if_msghdr *ifm;
951 struct ifa_msghdr *ifam;
952 struct ifma_msghdr *ifmam;
953 #ifdef RTM_IFANNOUNCE
954 struct if_announcemsghdr *ifan;
957 struct sockaddr_dl *sdl;
958 struct sockaddr_in *sa;
960 struct mibrcvaddr *rcv;
963 if (rtm->rtm_version != RTM_VERSION) {
964 syslog(LOG_ERR, "Bogus RTM version %u", rtm->rtm_version);
968 switch (rtm->rtm_type) {
971 ifam = (struct ifa_msghdr *)rtm;
972 mib_extract_addrs(ifam->ifam_addrs, (u_char *)(ifam + 1), addrs);
973 if (addrs[RTAX_IFA] == NULL || addrs[RTAX_NETMASK] == NULL)
976 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA];
977 if ((ifa = mib_find_ifa(sa->sin_addr)) == NULL) {
978 /* unknown address */
979 if ((ifp = mib_find_if_sys(ifam->ifam_index)) == NULL) {
980 syslog(LOG_WARNING, "RTM_NEWADDR for unknown "
981 "interface %u", ifam->ifam_index);
984 if ((ifa = alloc_ifa(ifp->index, sa->sin_addr)) == NULL)
987 sa = (struct sockaddr_in *)(void *)addrs[RTAX_NETMASK];
988 ifa->inmask = sa->sin_addr;
990 if (addrs[RTAX_BRD] != NULL) {
991 sa = (struct sockaddr_in *)(void *)addrs[RTAX_BRD];
992 ifa->inbcast = sa->sin_addr;
994 ifa->flags |= MIBIFA_FOUND;
998 ifam = (struct ifa_msghdr *)rtm;
999 mib_extract_addrs(ifam->ifam_addrs, (u_char *)(ifam + 1), addrs);
1000 if (addrs[RTAX_IFA] == NULL)
1003 sa = (struct sockaddr_in *)(void *)addrs[RTAX_IFA];
1004 if ((ifa = mib_find_ifa(sa->sin_addr)) != NULL) {
1005 ifa->flags |= MIBIFA_FOUND;
1006 if (!(ifa->flags & MIBIFA_DESTROYED))
1012 ifmam = (struct ifma_msghdr *)rtm;
1013 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs);
1014 if (addrs[RTAX_IFA] == NULL ||
1015 addrs[RTAX_IFA]->sa_family != AF_LINK)
1017 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA];
1018 if ((rcv = mib_find_rcvaddr(sdl->sdl_index,
1019 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL) {
1020 /* unknown address */
1021 if ((ifp = mib_find_if_sys(sdl->sdl_index)) == NULL) {
1022 syslog(LOG_WARNING, "RTM_NEWMADDR for unknown "
1023 "interface %u", sdl->sdl_index);
1026 if ((rcv = mib_rcvaddr_create(ifp,
1027 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) == NULL)
1029 rcv->flags |= MIBRCVADDR_VOLATILE;
1031 rcv->flags |= MIBRCVADDR_FOUND;
1035 ifmam = (struct ifma_msghdr *)rtm;
1036 mib_extract_addrs(ifmam->ifmam_addrs, (u_char *)(ifmam + 1), addrs);
1037 if (addrs[RTAX_IFA] == NULL ||
1038 addrs[RTAX_IFA]->sa_family != AF_LINK)
1040 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFA];
1041 if ((rcv = mib_find_rcvaddr(sdl->sdl_index,
1042 sdl->sdl_data + sdl->sdl_nlen, sdl->sdl_alen)) != NULL)
1043 mib_rcvaddr_delete(rcv);
1047 ifm = (struct if_msghdr *)rtm;
1048 mib_extract_addrs(ifm->ifm_addrs, (u_char *)(ifm + 1), addrs);
1049 if ((ifp = mib_find_if_sys(ifm->ifm_index)) == NULL)
1051 if (addrs[RTAX_IFP] != NULL &&
1052 addrs[RTAX_IFP]->sa_family == AF_LINK) {
1053 sdl = (struct sockaddr_dl *)(void *)addrs[RTAX_IFP];
1054 ptr = sdl->sdl_data + sdl->sdl_nlen;
1055 get_physaddr(ifp, sdl, ptr);
1057 (void)mib_fetch_ifmib(ifp);
1060 #ifdef RTM_IFANNOUNCE
1061 case RTM_IFANNOUNCE:
1062 ifan = (struct if_announcemsghdr *)rtm;
1063 ifp = mib_find_if_sys(ifan->ifan_index);
1065 switch (ifan->ifan_what) {
1068 if (ifp == NULL && (ifp = mibif_create(ifan->ifan_index,
1069 ifan->ifan_name)) != NULL) {
1070 (void)mib_fetch_ifmib(ifp);
1076 case IFAN_DEPARTURE:
1085 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs);
1086 if (rtm->rtm_flags & RTF_LLINFO) {
1087 if (addrs[RTAX_DST] == NULL ||
1088 addrs[RTAX_GATEWAY] == NULL ||
1089 addrs[RTAX_DST]->sa_family != AF_INET ||
1090 addrs[RTAX_GATEWAY]->sa_family != AF_LINK)
1093 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY],
1094 (struct sockaddr_in *)(void *)addrs[RTAX_DST]);
1096 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP))
1097 mib_sroute_process(rtm, addrs[RTAX_GATEWAY],
1098 addrs[RTAX_DST], addrs[RTAX_NETMASK]);
1103 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs);
1104 if (rtm->rtm_flags & RTF_LLINFO) {
1105 if (addrs[RTAX_DST] == NULL ||
1106 addrs[RTAX_GATEWAY] == NULL ||
1107 addrs[RTAX_DST]->sa_family != AF_INET ||
1108 addrs[RTAX_GATEWAY]->sa_family != AF_LINK)
1111 (struct sockaddr_dl *)(void *)addrs[RTAX_GATEWAY],
1112 (struct sockaddr_in *)(void *)addrs[RTAX_DST]);
1114 if (rtm->rtm_errno == 0 && (rtm->rtm_flags & RTF_UP))
1115 mib_sroute_process(rtm, addrs[RTAX_GATEWAY],
1116 addrs[RTAX_DST], addrs[RTAX_NETMASK]);
1121 mib_extract_addrs(rtm->rtm_addrs, (u_char *)(rtm + 1), addrs);
1122 if (rtm->rtm_errno == 0 && !(rtm->rtm_flags & RTF_LLINFO))
1123 mib_sroute_process(rtm, addrs[RTAX_GATEWAY],
1124 addrs[RTAX_DST], addrs[RTAX_NETMASK]);
1130 * send a routing message
1133 mib_send_rtmsg(struct rt_msghdr *rtm, struct sockaddr *gw,
1134 struct sockaddr *dst, struct sockaddr *mask)
1137 struct rt_msghdr *msg;
1141 len = sizeof(*rtm) + SA_SIZE(gw) + SA_SIZE(dst) + SA_SIZE(mask);
1142 if ((msg = malloc(len)) == NULL) {
1143 syslog(LOG_ERR, "%s: %m", __func__);
1146 cp = (char *)(msg + 1);
1148 memset(msg, 0, sizeof(*msg));
1150 msg->rtm_version = RTM_VERSION;
1151 msg->rtm_addrs = RTA_DST | RTA_GATEWAY;
1153 memcpy(cp, dst, SA_SIZE(dst));
1155 memcpy(cp, gw, SA_SIZE(gw));
1158 memcpy(cp, mask, SA_SIZE(mask));
1159 cp += SA_SIZE(mask);
1160 msg->rtm_addrs |= RTA_NETMASK;
1162 msg->rtm_msglen = cp - (char *)msg;
1163 msg->rtm_type = RTM_GET;
1164 if ((sent = write(route, msg, msg->rtm_msglen)) == -1) {
1165 syslog(LOG_ERR, "%s: write: %m", __func__);
1169 if (sent != msg->rtm_msglen) {
1170 syslog(LOG_ERR, "%s: short write", __func__);
1178 * Fetch the routing table via sysctl
1181 mib_fetch_rtab(int af, int info, int arg, size_t *lenp)
1184 u_char *buf, *newbuf;
1195 /* initial estimate */
1196 if (sysctl(name, 6, NULL, lenp, NULL, 0) == -1) {
1197 syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m",
1198 name[0], name[1], name[2], name[3], name[4], name[5]);
1206 if ((newbuf = realloc(buf, *lenp)) == NULL) {
1207 syslog(LOG_ERR, "sysctl buffer: %m");
1213 if (sysctl(name, 6, buf, lenp, NULL, 0) == 0)
1216 if (errno != ENOMEM) {
1217 syslog(LOG_ERR, "sysctl get: %m");
1221 *lenp += *lenp / 8 + 1;
1228 * Update the following info: interface, interface addresses, interface
1229 * receive addresses, arp-table.
1230 * This does not change the interface list itself.
1233 update_ifa_info(void)
1236 struct rt_msghdr *rtm;
1237 struct mibifa *ifa, *ifa1;
1238 struct mibrcvaddr *rcv, *rcv1;
1240 static const int infos[][3] = {
1241 { 0, NET_RT_IFLIST, 0 },
1242 #ifdef NET_RT_IFMALIST
1243 { AF_LINK, NET_RT_IFMALIST, 0 },
1248 TAILQ_FOREACH(ifa, &mibifa_list, link)
1249 ifa->flags &= ~MIBIFA_FOUND;
1250 TAILQ_FOREACH(rcv, &mibrcvaddr_list, link)
1251 rcv->flags &= ~MIBRCVADDR_FOUND;
1253 for (i = 0; i < sizeof(infos) / sizeof(infos[0]); i++) {
1254 if ((buf = mib_fetch_rtab(infos[i][0], infos[i][1], infos[i][2],
1259 while (next < buf + needed) {
1260 rtm = (struct rt_msghdr *)(void *)next;
1261 next += rtm->rtm_msglen;
1268 * Purge the address list of unused entries. These may happen for
1269 * interface aliases that are on the same subnet. We don't receive
1270 * routing socket messages for them.
1272 ifa = TAILQ_FIRST(&mibifa_list);
1273 while (ifa != NULL) {
1274 ifa1 = TAILQ_NEXT(ifa, link);
1275 if (!(ifa->flags & MIBIFA_FOUND))
1280 rcv = TAILQ_FIRST(&mibrcvaddr_list);
1281 while (rcv != NULL) {
1282 rcv1 = TAILQ_NEXT(rcv, link);
1283 if (!(rcv->flags & (MIBRCVADDR_FOUND | MIBRCVADDR_BCAST |
1285 mib_rcvaddr_delete(rcv);
1294 mib_arp_update(void)
1296 struct mibarp *at, *at1;
1299 struct rt_msghdr *rtm;
1302 return; /* Aaargh */
1305 TAILQ_FOREACH(at, &mibarp_list, link)
1306 at->flags &= ~MIBARP_FOUND;
1308 if ((buf = mib_fetch_rtab(AF_INET, NET_RT_FLAGS, RTF_LLINFO, &needed)) == NULL) {
1314 while (next < buf + needed) {
1315 rtm = (struct rt_msghdr *)(void *)next;
1316 next += rtm->rtm_msglen;
1321 at = TAILQ_FIRST(&mibarp_list);
1322 while (at != NULL) {
1323 at1 = TAILQ_NEXT(at, link);
1324 if (!(at->flags & MIBARP_FOUND))
1328 mibarpticks = get_ticks();
1335 * Intput on the routing socket.
1338 route_input(int fd, void *udata __unused)
1340 u_char buf[1024 * 16];
1342 struct rt_msghdr *rtm;
1344 if ((n = read(fd, buf, sizeof(buf))) == -1)
1345 err(1, "read(rt_socket)");
1348 errx(1, "EOF on rt_socket");
1350 rtm = (struct rt_msghdr *)(void *)buf;
1351 if ((size_t)n != rtm->rtm_msglen)
1352 errx(1, "n=%zu, rtm_msglen=%u", (size_t)n, rtm->rtm_msglen);
1358 * execute and SIOCAIFADDR
1361 siocaifaddr(char *ifname, struct in_addr addr, struct in_addr mask,
1362 struct in_addr bcast)
1364 struct ifaliasreq addreq;
1365 struct sockaddr_in *sa;
1367 memset(&addreq, 0, sizeof(addreq));
1368 strncpy(addreq.ifra_name, ifname, sizeof(addreq.ifra_name));
1370 sa = (struct sockaddr_in *)(void *)&addreq.ifra_addr;
1371 sa->sin_family = AF_INET;
1372 sa->sin_len = sizeof(*sa);
1373 sa->sin_addr = addr;
1375 sa = (struct sockaddr_in *)(void *)&addreq.ifra_mask;
1376 sa->sin_family = AF_INET;
1377 sa->sin_len = sizeof(*sa);
1378 sa->sin_addr = mask;
1380 sa = (struct sockaddr_in *)(void *)&addreq.ifra_broadaddr;
1381 sa->sin_family = AF_INET;
1382 sa->sin_len = sizeof(*sa);
1383 sa->sin_addr = bcast;
1385 return (ioctl(mib_netsock, SIOCAIFADDR, &addreq));
1389 * Exececute a SIOCDIFADDR
1392 siocdifaddr(const char *ifname, struct in_addr addr)
1394 struct ifreq delreq;
1395 struct sockaddr_in *sa;
1397 memset(&delreq, 0, sizeof(delreq));
1398 strncpy(delreq.ifr_name, ifname, sizeof(delreq.ifr_name));
1399 sa = (struct sockaddr_in *)(void *)&delreq.ifr_addr;
1400 sa->sin_family = AF_INET;
1401 sa->sin_len = sizeof(*sa);
1402 sa->sin_addr = addr;
1404 return (ioctl(mib_netsock, SIOCDIFADDR, &delreq));
1408 * Verify an interface address without fetching the entire list
1411 verify_ifa(const char *name, struct mibifa *ifa)
1414 struct sockaddr_in *sa;
1416 memset(&req, 0, sizeof(req));
1417 strncpy(req.ifr_name, name, sizeof(req.ifr_name));
1418 sa = (struct sockaddr_in *)(void *)&req.ifr_addr;
1419 sa->sin_family = AF_INET;
1420 sa->sin_len = sizeof(*sa);
1421 sa->sin_addr = ifa->inaddr;
1423 if (ioctl(mib_netsock, SIOCGIFADDR, &req) == -1)
1425 if (ifa->inaddr.s_addr != sa->sin_addr.s_addr) {
1426 syslog(LOG_ERR, "%s: address mismatch", __func__);
1430 if (ioctl(mib_netsock, SIOCGIFNETMASK, &req) == -1)
1432 if (ifa->inmask.s_addr != sa->sin_addr.s_addr) {
1433 syslog(LOG_ERR, "%s: netmask mismatch", __func__);
1440 * Restore a deleted interface address. Don't wait for the routing socket
1444 mib_undestroy_ifa(struct mibifa *ifa)
1448 if ((ifp = mib_find_if(ifa->ifindex)) == NULL)
1449 /* keep it destroyed */
1452 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast))
1453 /* keep it destroyed */
1456 ifa->flags &= ~MIBIFA_DESTROYED;
1460 * Destroy an interface address
1463 mib_destroy_ifa(struct mibifa *ifa)
1467 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) {
1472 if (siocdifaddr(ifp->name, ifa->inaddr)) {
1474 syslog(LOG_ERR, "SIOCDIFADDR: %m");
1478 ifa->flags |= MIBIFA_DESTROYED;
1483 * Rollback the modification of an address. Don't bother to wait for
1484 * the routing socket.
1487 mib_unmodify_ifa(struct mibifa *ifa)
1491 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) {
1497 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) {
1508 mib_modify_ifa(struct mibifa *ifa)
1512 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) {
1518 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) {
1524 if (verify_ifa(ifp->name, ifa)) {
1534 * Destroy a freshly created interface address. Don't bother to wait for
1535 * the routing socket.
1538 mib_uncreate_ifa(struct mibifa *ifa)
1542 if ((ifp = mib_find_if(ifa->ifindex)) == NULL) {
1547 if (siocdifaddr(ifp->name, ifa->inaddr)) {
1557 * Create a new ifa and verify it
1560 mib_create_ifa(u_int ifindex, struct in_addr addr, struct in_addr mask,
1561 struct in_addr bcast)
1566 if ((ifp = mib_find_if(ifindex)) == NULL)
1568 if ((ifa = alloc_ifa(ifindex, addr)) == NULL)
1571 ifa->inbcast = bcast;
1573 if (siocaifaddr(ifp->name, ifa->inaddr, ifa->inmask, ifa->inbcast)) {
1574 syslog(LOG_ERR, "%s: %m", __func__);
1578 if (verify_ifa(ifp->name, ifa)) {
1586 * Get all cloning interfaces and make them dynamic.
1587 * Hah! Whe should probably do this on a periodic basis (XXX).
1592 struct if_clonereq req;
1596 memset(&req, 0, sizeof(req));
1597 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) {
1598 syslog(LOG_ERR, "get cloners: %m");
1601 if ((buf = malloc(req.ifcr_total * IFNAMSIZ)) == NULL) {
1602 syslog(LOG_ERR, "%m");
1605 req.ifcr_count = req.ifcr_total;
1606 req.ifcr_buffer = buf;
1607 if (ioctl(mib_netsock, SIOCIFGCLONERS, &req) == -1) {
1608 syslog(LOG_ERR, "get cloners: %m");
1612 for (cp = buf, i = 0; i < req.ifcr_total; i++, cp += IFNAMSIZ)
1625 if (mib_iflist_bad) {
1626 TAILQ_FOREACH(ifa, &mibifa_list, link)
1627 ifa->flags &= ~MIBIFA_DESTROYED;
1629 /* assume, that all cloning interfaces are dynamic */
1632 mib_refresh_iflist();
1648 if ((route_fd = fd_select(route, route_input, NULL, module)) == NULL) {
1649 syslog(LOG_ERR, "fd_select(route): %m");
1652 mib_refresh_iflist();
1655 (void)mib_fetch_route();
1656 mib_iftable_last_change = 0;
1657 mib_ifstack_last_change = 0;
1659 ifmib_reg = or_register(&oid_ifMIB,
1660 "The MIB module to describe generic objects for network interface"
1661 " sub-layers.", module);
1663 ipmib_reg = or_register(&oid_ipMIB,
1664 "The MIB module for managing IP and ICMP implementations, but "
1665 "excluding their management of IP routes.", module);
1667 tcpmib_reg = or_register(&oid_tcpMIB,
1668 "The MIB module for managing TCP implementations.", module);
1670 udpmib_reg = or_register(&oid_udpMIB,
1671 "The MIB module for managing UDP implementations.", module);
1673 ipForward_reg = or_register(&oid_ipForward,
1674 "The MIB module for the display of CIDR multipath IP Routes.",
1679 * Initialize the module
1682 mibII_init(struct lmodule *mod, int argc __unused, char *argv[] __unused)
1688 len = sizeof(clockinfo);
1689 if (sysctlbyname("kern.clockrate", &clockinfo, &len, NULL, 0) == -1) {
1690 syslog(LOG_ERR, "kern.clockrate: %m");
1693 if (len != sizeof(clockinfo)) {
1694 syslog(LOG_ERR, "kern.clockrate: wrong size");
1698 if ((route = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC)) == -1) {
1699 syslog(LOG_ERR, "PF_ROUTE: %m");
1703 if ((mib_netsock = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
1704 syslog(LOG_ERR, "PF_INET: %m");
1708 (void)shutdown(mib_netsock, SHUT_RDWR);
1710 /* assume, that all cloning interfaces are dynamic */
1719 if (route_fd != NULL)
1720 fd_deselect(route_fd);
1723 if (mib_netsock != -1)
1724 (void)close(mib_netsock);
1725 /* XXX free memory */
1727 or_unregister(ipForward_reg);
1728 or_unregister(udpmib_reg);
1729 or_unregister(tcpmib_reg);
1730 or_unregister(ipmib_reg);
1731 or_unregister(ifmib_reg);
1737 mibII_loading(const struct lmodule *mod, int loaded)
1744 TAILQ_FOREACH(ifp, &mibif_list, link)
1745 if (ifp->xnotify_mod == mod) {
1746 ifp->xnotify_mod = NULL;
1747 ifp->xnotify_data = NULL;
1748 ifp->xnotify = NULL;
1751 mib_unregister_newif(mod);
1754 const struct snmp_module config = {
1755 "This module implements the interface and ip groups.",
1758 mibII_idle, /* idle */
1769 * Should have a list of these attached to each interface.
1772 mibif_notify(struct mibif *ifp, const struct lmodule *mod,
1773 mibif_notify_f func, void *data)
1775 ifp->xnotify = func;
1776 ifp->xnotify_data = data;
1777 ifp->xnotify_mod = mod;
1783 mibif_unnotify(void *arg)
1785 struct mibif *ifp = arg;
1787 ifp->xnotify = NULL;
1788 ifp->xnotify_data = NULL;
1789 ifp->xnotify_mod = NULL;