2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
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14 * may be used to endorse or promote products derived from this software
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26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)if_ether.c 8.1 (Berkeley) 6/10/93
33 * Ethernet address resolution protocol.
35 * add "inuse/lock" bit (or ref. count) along with valid bit
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
42 #include "opt_route.h"
46 #include <sys/param.h>
47 #include <sys/kernel.h>
48 #include <sys/queue.h>
49 #include <sys/sysctl.h>
50 #include <sys/systm.h>
52 #include <sys/malloc.h>
54 #include <sys/socket.h>
55 #include <sys/syslog.h>
56 #include <sys/vimage.h>
59 #include <net/if_dl.h>
60 #include <net/if_types.h>
61 #include <net/route.h>
62 #include <net/netisr.h>
63 #include <net/if_llc.h>
64 #include <net/ethernet.h>
67 #include <netinet/in.h>
68 #include <netinet/in_var.h>
69 #include <net/if_llatbl.h>
70 #include <netinet/if_ether.h>
71 #include <netinet/vinet.h>
73 #include <net/if_arc.h>
74 #include <net/iso88025.h>
77 #include <netinet/ip_carp.h>
80 #include <security/mac/mac_framework.h>
82 #define SIN(s) ((struct sockaddr_in *)s)
83 #define SDL(s) ((struct sockaddr_dl *)s)
84 #define LLTABLE(ifp) \
85 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
87 SYSCTL_DECL(_net_link_ether);
88 SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, "");
92 static int arpt_keep; /* once resolved, good for 20 more minutes */
93 static int arp_maxtries;
94 int useloopback; /* use loopback interface for local traffic */
95 static int arp_proxyall;
98 SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, max_age,
99 CTLFLAG_RW, arpt_keep, 0, "ARP entry lifetime in seconds");
101 static struct ifqueue arpintrq;
103 SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, maxtries,
104 CTLFLAG_RW, arp_maxtries, 0,
105 "ARP resolution attempts before returning error");
106 SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, useloopback,
107 CTLFLAG_RW, useloopback, 0,
108 "Use the loopback interface for local traffic");
109 SYSCTL_V_INT(V_NET, vnet_inet, _net_link_ether_inet, OID_AUTO, proxyall,
110 CTLFLAG_RW, arp_proxyall, 0,
111 "Enable proxy ARP for all suitable requests");
113 static void arp_init(void);
114 void arprequest(struct ifnet *,
115 struct in_addr *, struct in_addr *, u_char *);
116 static void arpintr(struct mbuf *);
117 static void arptimer(void *);
119 static void in_arpinput(struct mbuf *);
123 void arp_ifscrub(struct ifnet *ifp, uint32_t addr);
126 * called by in_ifscrub to remove entry from the table when
127 * the interface goes away
130 arp_ifscrub(struct ifnet *ifp, uint32_t addr)
132 struct sockaddr_in addr4;
134 bzero((void *)&addr4, sizeof(addr4));
135 addr4.sin_len = sizeof(addr4);
136 addr4.sin_family = AF_INET;
137 addr4.sin_addr.s_addr = addr;
139 lla_lookup(LLTABLE(ifp), (LLE_DELETE | LLE_IFADDR),
140 (struct sockaddr *)&addr4);
141 IF_AFDATA_UNLOCK(ifp);
146 * Timeout routine. Age arp_tab entries periodically.
152 struct llentry *lle = (struct llentry *)arg;
155 panic("%s: NULL entry!\n", __func__);
158 ifp = lle->lle_tbl->llt_ifp;
161 if (((lle->la_flags & LLE_DELETED)
162 || (time_second >= lle->la_expire))
163 && (!callout_pending(&lle->la_timer) &&
164 callout_active(&lle->la_timer)))
165 (void) llentry_free(lle);
168 * Still valid, just drop our reference
170 LLE_FREE_LOCKED(lle);
172 IF_AFDATA_UNLOCK(ifp);
176 * Broadcast an ARP request. Caller specifies:
177 * - arp header source ip address
178 * - arp header target ip address
179 * - arp header source ethernet address
182 arprequest(struct ifnet *ifp, struct in_addr *sip, struct in_addr *tip,
190 /* XXX don't believe this can happen (or explain why) */
192 * The caller did not supply a source address, try to find
193 * a compatible one among those assigned to this interface.
197 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
198 if (!ifa->ifa_addr ||
199 ifa->ifa_addr->sa_family != AF_INET)
201 sip = &SIN(ifa->ifa_addr)->sin_addr;
202 if (0 == ((sip->s_addr ^ tip->s_addr) &
203 SIN(ifa->ifa_netmask)->sin_addr.s_addr) )
204 break; /* found it. */
207 printf("%s: cannot find matching address\n", __func__);
212 if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)
214 m->m_len = sizeof(*ah) + 2*sizeof(struct in_addr) +
215 2*ifp->if_data.ifi_addrlen;
216 m->m_pkthdr.len = m->m_len;
217 MH_ALIGN(m, m->m_len);
218 ah = mtod(m, struct arphdr *);
219 bzero((caddr_t)ah, m->m_len);
221 mac_netinet_arp_send(ifp, m);
223 ah->ar_pro = htons(ETHERTYPE_IP);
224 ah->ar_hln = ifp->if_addrlen; /* hardware address length */
225 ah->ar_pln = sizeof(struct in_addr); /* protocol address length */
226 ah->ar_op = htons(ARPOP_REQUEST);
227 bcopy((caddr_t)enaddr, (caddr_t)ar_sha(ah), ah->ar_hln);
228 bcopy((caddr_t)sip, (caddr_t)ar_spa(ah), ah->ar_pln);
229 bcopy((caddr_t)tip, (caddr_t)ar_tpa(ah), ah->ar_pln);
230 sa.sa_family = AF_ARP;
232 m->m_flags |= M_BCAST;
233 (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0);
237 * Resolve an IP address into an ethernet address.
239 * ifp is the interface we use
240 * rt0 is the route to the final destination (possibly useless)
241 * m is the mbuf. May be NULL if we don't have a packet.
242 * dst is the next hop,
243 * desten is where we want the address.
245 * On success, desten is filled in and the function returns 0;
246 * If the packet must be held pending resolution, we return EWOULDBLOCK
247 * On other errors, we return the corresponding error code.
248 * Note that m_freem() handles NULL.
251 arpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m,
252 struct sockaddr *dst, u_char *desten, struct llentry **lle)
254 INIT_VNET_INET(ifp->if_vnet);
255 struct llentry *la = 0;
261 if (m->m_flags & M_BCAST) {
264 ifp->if_broadcastaddr, ifp->if_addrlen);
267 if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {
269 ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten);
276 IF_AFDATA_RLOCK(ifp);
277 la = lla_lookup(LLTABLE(ifp), flags, dst);
278 IF_AFDATA_RUNLOCK(ifp);
279 if ((la == NULL) && ((flags & LLE_EXCLUSIVE) == 0)
280 && ((ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) == 0)) {
281 flags |= (LLE_CREATE | LLE_EXCLUSIVE);
282 IF_AFDATA_WLOCK(ifp);
283 la = lla_lookup(LLTABLE(ifp), flags, dst);
284 IF_AFDATA_WUNLOCK(ifp);
287 if (flags & LLE_CREATE)
289 "arpresolve: can't allocate llinfo for %s\n",
290 inet_ntoa(SIN(dst)->sin_addr));
295 if ((la->la_flags & LLE_VALID) &&
296 ((la->la_flags & LLE_STATIC) || la->la_expire > time_uptime)) {
297 bcopy(&la->ll_addr, desten, ifp->if_addrlen);
299 * If entry has an expiry time and it is approaching,
300 * see if we need to send an ARP request within this
301 * arpt_down interval.
303 if (!(la->la_flags & LLE_STATIC) &&
304 time_uptime + la->la_preempt > la->la_expire) {
305 arprequest(ifp, NULL,
306 &SIN(dst)->sin_addr, IF_LLADDR(ifp));
316 if (la->la_flags & LLE_STATIC) { /* should not happen! */
317 log(LOG_DEBUG, "arpresolve: ouch, empty static llinfo for %s\n",
318 inet_ntoa(SIN(dst)->sin_addr));
324 renew = (la->la_asked == 0 || la->la_expire != time_uptime);
325 if ((renew || m != NULL) && (flags & LLE_EXCLUSIVE) == 0) {
326 flags |= LLE_EXCLUSIVE;
331 * There is an arptab entry, but no ethernet address
332 * response yet. Replace the held mbuf with this
336 if (la->la_hold != NULL)
337 m_freem(la->la_hold);
339 if (renew == 0 && (flags & LLE_EXCLUSIVE)) {
340 flags &= ~LLE_EXCLUSIVE;
346 * Return EWOULDBLOCK if we have tried less than arp_maxtries. It
347 * will be masked by ether_output(). Return EHOSTDOWN/EHOSTUNREACH
348 * if we have already sent arp_maxtries ARP requests. Retransmit the
349 * ARP request, but not faster than one request per second.
351 if (la->la_asked < V_arp_maxtries)
352 error = EWOULDBLOCK; /* First request. */
355 (rt0->rt_flags & RTF_GATEWAY) ? EHOSTDOWN : EHOSTUNREACH;
359 la->la_expire = time_uptime;
360 callout_reset(&la->la_timer, hz, arptimer, la);
363 arprequest(ifp, NULL, &SIN(dst)->sin_addr,
368 if (flags & LLE_EXCLUSIVE)
376 * Common length and type checks are done here,
377 * then the protocol-specific routine is called.
380 arpintr(struct mbuf *m)
384 if (m->m_len < sizeof(struct arphdr) &&
385 ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) {
386 log(LOG_ERR, "arp: runt packet -- m_pullup failed\n");
389 ar = mtod(m, struct arphdr *);
391 if (ntohs(ar->ar_hrd) != ARPHRD_ETHER &&
392 ntohs(ar->ar_hrd) != ARPHRD_IEEE802 &&
393 ntohs(ar->ar_hrd) != ARPHRD_ARCNET &&
394 ntohs(ar->ar_hrd) != ARPHRD_IEEE1394) {
395 log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n",
396 (unsigned char *)&ar->ar_hrd, "");
401 if (m->m_len < arphdr_len(ar)) {
402 if ((m = m_pullup(m, arphdr_len(ar))) == NULL) {
403 log(LOG_ERR, "arp: runt packet\n");
407 ar = mtod(m, struct arphdr *);
410 switch (ntohs(ar->ar_pro)) {
422 * ARP for Internet protocols on 10 Mb/s Ethernet.
423 * Algorithm is that given in RFC 826.
424 * In addition, a sanity check is performed on the sender
425 * protocol address, to catch impersonators.
426 * We no longer handle negotiations for use of trailer protocol:
427 * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent
428 * along with IP replies if we wanted trailers sent to us,
429 * and also sent them in response to IP replies.
430 * This allowed either end to announce the desire to receive
432 * We no longer reply to requests for ETHERTYPE_TRAIL protocol either,
433 * but formerly didn't normally send requests.
435 static int log_arp_wrong_iface = 1;
436 static int log_arp_movements = 1;
437 static int log_arp_permanent_modify = 1;
439 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW,
440 &log_arp_wrong_iface, 0,
441 "log arp packets arriving on the wrong interface");
442 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW,
443 &log_arp_movements, 0,
444 "log arp replies from MACs different than the one in the cache");
445 SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_permanent_modify, CTLFLAG_RW,
446 &log_arp_permanent_modify, 0,
447 "log arp replies from MACs different than the one in the permanent arp entry");
451 in_arpinput(struct mbuf *m)
454 struct ifnet *ifp = m->m_pkthdr.rcvif;
455 struct llentry *la = NULL;
458 struct in_ifaddr *ia;
460 struct in_addr isaddr, itaddr, myaddr;
461 u_int8_t *enaddr = NULL;
465 int bridged = 0, is_bridge = 0;
469 struct sockaddr_in sin;
470 sin.sin_len = sizeof(struct sockaddr_in);
471 sin.sin_family = AF_INET;
472 sin.sin_addr.s_addr = 0;
473 INIT_VNET_INET(ifp->if_vnet);
477 if (ifp->if_type == IFT_BRIDGE)
480 req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr));
481 if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) {
482 log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n");
486 ah = mtod(m, struct arphdr *);
487 op = ntohs(ah->ar_op);
488 (void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr));
489 (void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr));
492 * For a bridge, we want to check the address irrespective
493 * of the receive interface. (This will change slightly
494 * when we have clusters of interfaces).
495 * If the interface does not match, but the recieving interface
496 * is part of carp, we call carp_iamatch to see if this is a
497 * request for the virtual host ip.
498 * XXX: This is really ugly!
500 LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) {
501 if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
502 ia->ia_ifp == ifp) &&
503 itaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
506 if (ifp->if_carp != NULL &&
507 carp_iamatch(ifp->if_carp, ia, &isaddr, &enaddr) &&
508 itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) {
514 LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash)
515 if (((bridged && ia->ia_ifp->if_bridge != NULL) ||
516 ia->ia_ifp == ifp) &&
517 isaddr.s_addr == ia->ia_addr.sin_addr.s_addr)
520 #define BDG_MEMBER_MATCHES_ARP(addr, ifp, ia) \
521 (ia->ia_ifp->if_bridge == ifp->if_softc && \
522 !bcmp(IF_LLADDR(ia->ia_ifp), IF_LLADDR(ifp), ifp->if_addrlen) && \
523 addr == ia->ia_addr.sin_addr.s_addr)
525 * Check the case when bridge shares its MAC address with
526 * some of its children, so packets are claimed by bridge
527 * itself (bridge_input() does it first), but they are really
528 * meant to be destined to the bridge member.
531 LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) {
532 if (BDG_MEMBER_MATCHES_ARP(itaddr.s_addr, ifp, ia)) {
538 #undef BDG_MEMBER_MATCHES_ARP
541 * No match, use the first inet address on the receive interface
542 * as a dummy address for the rest of the function.
544 TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
545 if (ifa->ifa_addr->sa_family == AF_INET) {
550 * If bridging, fall back to using any inet address.
552 if (!bridged || (ia = TAILQ_FIRST(&V_in_ifaddrhead)) == NULL)
556 enaddr = (u_int8_t *)IF_LLADDR(ifp);
557 myaddr = ia->ia_addr.sin_addr;
558 if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen))
559 goto drop; /* it's from me, ignore it. */
560 if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) {
562 "arp: link address is broadcast for IP address %s!\n",
567 * Warn if another host is using the same IP address, but only if the
568 * IP address isn't 0.0.0.0, which is used for DHCP only, in which
569 * case we suppress the warning to avoid false positive complaints of
570 * potential misconfiguration.
572 if (!bridged && isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) {
574 "arp: %*D is using my IP address %s on %s!\n",
575 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
576 inet_ntoa(isaddr), ifp->if_xname);
580 if (ifp->if_flags & IFF_STATICARP)
583 bzero(&sin, sizeof(sin));
584 sin.sin_len = sizeof(struct sockaddr_in);
585 sin.sin_family = AF_INET;
586 sin.sin_addr = isaddr;
587 flags = (itaddr.s_addr == myaddr.s_addr) ? LLE_CREATE : 0;
588 flags |= LLE_EXCLUSIVE;
590 la = lla_lookup(LLTABLE(ifp), flags, (struct sockaddr *)&sin);
591 IF_AFDATA_UNLOCK(ifp);
593 /* the following is not an error when doing bridging */
594 if (!bridged && la->lle_tbl->llt_ifp != ifp
596 && (ifp->if_type != IFT_CARP || !carp_match)
599 if (log_arp_wrong_iface)
600 log(LOG_ERR, "arp: %s is on %s "
601 "but got reply from %*D on %s\n",
603 la->lle_tbl->llt_ifp->if_xname,
604 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
608 if ((la->la_flags & LLE_VALID) &&
609 bcmp(ar_sha(ah), &la->ll_addr, ifp->if_addrlen)) {
610 if (la->la_flags & LLE_STATIC) {
612 "arp: %*D attempts to modify permanent "
613 "entry for %s on %s\n",
614 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
615 inet_ntoa(isaddr), ifp->if_xname);
618 if (log_arp_movements) {
619 log(LOG_INFO, "arp: %s moved from %*D "
623 (u_char *)&la->ll_addr, ":",
624 ifp->if_addrlen, (u_char *)ar_sha(ah), ":",
629 if (ifp->if_addrlen != ah->ar_hln) {
631 "arp from %*D: addr len: new %d, i/f %d (ignored)",
632 ifp->if_addrlen, (u_char *) ar_sha(ah), ":",
633 ah->ar_hln, ifp->if_addrlen);
636 (void)memcpy(&la->ll_addr, ar_sha(ah), ifp->if_addrlen);
637 la->la_flags |= LLE_VALID;
639 if (!(la->la_flags & LLE_STATIC)) {
640 la->la_expire = time_uptime + V_arpt_keep;
641 callout_reset(&la->la_timer, hz * V_arpt_keep,
645 la->la_preempt = V_arp_maxtries;
646 if (la->la_hold != NULL) {
649 memcpy(&sa, L3_ADDR(la), sizeof(sa));
652 (*ifp->if_output)(ifp, m0, &sa, NULL);
657 if (op != ARPOP_REQUEST)
660 if (itaddr.s_addr == myaddr.s_addr) {
661 /* Shortcut.. the receiving interface is the target. */
662 (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
663 (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln);
665 struct llentry *lle = NULL;
670 sin.sin_addr = itaddr;
671 /* XXX MRT use table 0 for arp reply */
672 rt = in_rtalloc1((struct sockaddr *)&sin, 0, 0UL, 0);
677 * Don't send proxies for nodes on the same interface
678 * as this one came out of, or we'll get into a fight
679 * over who claims what Ether address.
681 if (!rt->rt_ifp || rt->rt_ifp == ifp) {
685 IF_AFDATA_LOCK(rt->rt_ifp);
686 lle = lla_lookup(LLTABLE(rt->rt_ifp), 0, (struct sockaddr *)&sin);
687 IF_AFDATA_UNLOCK(rt->rt_ifp);
691 (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln);
692 (void)memcpy(ar_sha(ah), &lle->ll_addr, ah->ar_hln);
698 * Also check that the node which sent the ARP packet
699 * is on the the interface we expect it to be on. This
700 * avoids ARP chaos if an interface is connected to the
703 sin.sin_addr = isaddr;
705 /* XXX MRT use table 0 for arp checks */
706 rt = in_rtalloc1((struct sockaddr *)&sin, 0, 0UL, 0);
709 if (rt->rt_ifp != ifp) {
710 log(LOG_INFO, "arp_proxy: ignoring request"
711 " from %s via %s, expecting %s\n",
712 inet_ntoa(isaddr), ifp->if_xname,
713 rt->rt_ifp->if_xname);
720 printf("arp: proxying for %s\n",
727 if (itaddr.s_addr == myaddr.s_addr &&
728 IN_LINKLOCAL(ntohl(itaddr.s_addr))) {
729 /* RFC 3927 link-local IPv4; always reply by broadcast. */
730 #ifdef DEBUG_LINKLOCAL
731 printf("arp: sending reply for link-local addr %s\n",
734 m->m_flags |= M_BCAST;
735 m->m_flags &= ~M_MCAST;
737 /* default behaviour; never reply by broadcast. */
738 m->m_flags &= ~(M_BCAST|M_MCAST);
740 (void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln);
741 (void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln);
742 ah->ar_op = htons(ARPOP_REPLY);
743 ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */
744 m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + (2 * ah->ar_hln);
745 m->m_pkthdr.len = m->m_len;
746 sa.sa_family = AF_ARP;
748 (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0);
759 arp_ifinit(struct ifnet *ifp, struct ifaddr *ifa)
763 if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) {
764 arprequest(ifp, &IA_SIN(ifa)->sin_addr,
765 &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp));
767 * interface address is considered static entry
768 * because the output of the arp utility shows
769 * that L2 entry as permanent
772 lle = lla_lookup(LLTABLE(ifp), (LLE_CREATE | LLE_IFADDR | LLE_STATIC),
773 (struct sockaddr *)IA_SIN(ifa));
774 IF_AFDATA_UNLOCK(ifp);
776 log(LOG_INFO, "arp_ifinit: cannot create arp "
777 "entry for interface address\n");
781 ifa->ifa_rtrequest = NULL;
785 arp_ifinit2(struct ifnet *ifp, struct ifaddr *ifa, u_char *enaddr)
787 if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY)
788 arprequest(ifp, &IA_SIN(ifa)->sin_addr,
789 &IA_SIN(ifa)->sin_addr, enaddr);
790 ifa->ifa_rtrequest = NULL;
796 INIT_VNET_INET(curvnet);
798 V_arpt_keep = (20*60); /* once resolved, good for 20 more minutes */
800 V_useloopback = 1; /* use loopback interface for local traffic */
803 arpintrq.ifq_maxlen = 50;
804 mtx_init(&arpintrq.ifq_mtx, "arp_inq", NULL, MTX_DEF);
805 netisr_register(NETISR_ARP, arpintr, &arpintrq, 0);
807 SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);