if_ether.c revision 138615
11541Srgrimes/* 21541Srgrimes * Copyright (c) 1982, 1986, 1988, 1993 31541Srgrimes * The Regents of the University of California. All rights reserved. 41541Srgrimes * 51541Srgrimes * Redistribution and use in source and binary forms, with or without 61541Srgrimes * modification, are permitted provided that the following conditions 71541Srgrimes * are met: 81541Srgrimes * 1. Redistributions of source code must retain the above copyright 91541Srgrimes * notice, this list of conditions and the following disclaimer. 101541Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111541Srgrimes * notice, this list of conditions and the following disclaimer in the 121541Srgrimes * documentation and/or other materials provided with the distribution. 131541Srgrimes * 4. Neither the name of the University nor the names of its contributors 141541Srgrimes * may be used to endorse or promote products derived from this software 151541Srgrimes * without specific prior written permission. 161541Srgrimes * 171541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271541Srgrimes * SUCH DAMAGE. 281541Srgrimes * 291541Srgrimes * @(#)if_ether.c 8.1 (Berkeley) 6/10/93 3050477Speter * $FreeBSD: head/sys/netinet/if_ether.c 138615 2004-12-09 00:12:41Z mlaier $ 311541Srgrimes */ 321541Srgrimes 331541Srgrimes/* 341541Srgrimes * Ethernet address resolution protocol. 351541Srgrimes * TODO: 361541Srgrimes * add "inuse/lock" bit (or ref. count) along with valid bit 371541Srgrimes */ 381541Srgrimes 3932350Seivind#include "opt_inet.h" 4041793Sluigi#include "opt_bdg.h" 41101090Srwatson#include "opt_mac.h" 4232350Seivind 431541Srgrimes#include <sys/param.h> 4412693Sphk#include <sys/kernel.h> 4544078Sdfr#include <sys/queue.h> 4612693Sphk#include <sys/sysctl.h> 471541Srgrimes#include <sys/systm.h> 48101090Srwatson#include <sys/mac.h> 4912693Sphk#include <sys/mbuf.h> 501541Srgrimes#include <sys/malloc.h> 5118892Sbde#include <sys/socket.h> 521541Srgrimes#include <sys/syslog.h> 531541Srgrimes 541541Srgrimes#include <net/if.h> 551541Srgrimes#include <net/if_dl.h> 5644165Sjulian#include <net/if_types.h> 571541Srgrimes#include <net/route.h> 588426Swollman#include <net/netisr.h> 5958313Slile#include <net/if_llc.h> 6071963Sjulian#include <net/ethernet.h> 6171963Sjulian#include <net/bridge.h> 621541Srgrimes 631541Srgrimes#include <netinet/in.h> 641541Srgrimes#include <netinet/in_var.h> 651541Srgrimes#include <netinet/if_ether.h> 661541Srgrimes 6784931Sfjoe#include <net/if_arc.h> 6844627Sjulian#include <net/iso88025.h> 6944627Sjulian 701541Srgrimes#define SIN(s) ((struct sockaddr_in *)s) 711541Srgrimes#define SDL(s) ((struct sockaddr_dl *)s) 721541Srgrimes 7344078SdfrSYSCTL_DECL(_net_link_ether); 7412942SwollmanSYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, ""); 751541Srgrimes 7612693Sphk/* timer values */ 7712942Swollmanstatic int arpt_prune = (5*60*1); /* walk list every 5 minutes */ 7812942Swollmanstatic int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ 7912942Swollmanstatic int arpt_down = 20; /* once declared down, don't send for 20 sec */ 801541Srgrimes 8112942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW, 8212942Swollman &arpt_prune, 0, ""); 8312942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW, 8412942Swollman &arpt_keep, 0, ""); 8512942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW, 8612942Swollman &arpt_down, 0, ""); 8712693Sphk 881541Srgrimes#define rt_expire rt_rmx.rmx_expire 891541Srgrimes 9011225Swollmanstruct llinfo_arp { 9160938Sjake LIST_ENTRY(llinfo_arp) la_le; 9211225Swollman struct rtentry *la_rt; 93110308Sorion struct mbuf *la_hold; /* last packet until resolved/timeout */ 94110544Sorion u_short la_preempt; /* countdown for pre-expiry arps */ 95110308Sorion u_short la_asked; /* #times we QUERIED following expiration */ 9611225Swollman#define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 9711225Swollman}; 9812693Sphk 9960938Sjakestatic LIST_HEAD(, llinfo_arp) llinfo_arp; 10011225Swollman 101111888Sjlemonstatic struct ifqueue arpintrq; 102120727Ssamstatic int arp_allocated; 1031541Srgrimes 10412693Sphkstatic int arp_maxtries = 5; 10512942Swollmanstatic int useloopback = 1; /* use loopback interface for local traffic */ 10612942Swollmanstatic int arp_proxyall = 0; 107120727Ssamstatic struct callout arp_callout; 1083282Swollman 10912942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW, 11012942Swollman &arp_maxtries, 0, ""); 11112942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW, 11212942Swollman &useloopback, 0, ""); 11312942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW, 11412942Swollman &arp_proxyall, 0, ""); 11512693Sphk 11692723Salfredstatic void arp_init(void); 11792723Salfredstatic void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 11892723Salfredstatic void arprequest(struct ifnet *, 11992723Salfred struct in_addr *, struct in_addr *, u_char *); 120111888Sjlemonstatic void arpintr(struct mbuf *); 12192723Salfredstatic void arptfree(struct llinfo_arp *); 12292723Salfredstatic void arptimer(void *); 12312693Sphkstatic struct llinfo_arp 12492723Salfred *arplookup(u_long, int, int); 12532350Seivind#ifdef INET 12692723Salfredstatic void in_arpinput(struct mbuf *); 12732350Seivind#endif 12812693Sphk 1291541Srgrimes/* 1301541Srgrimes * Timeout routine. Age arp_tab entries periodically. 1311541Srgrimes */ 1321541Srgrimes/* ARGSUSED */ 1331541Srgrimesstatic void 1341541Srgrimesarptimer(ignored_arg) 1351541Srgrimes void *ignored_arg; 1361541Srgrimes{ 137109409Shsu struct llinfo_arp *la, *ola; 1381541Srgrimes 139109996Shsu RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET]); 140109409Shsu la = LIST_FIRST(&llinfo_arp); 141109409Shsu while (la != NULL) { 142109409Shsu struct rtentry *rt = la->la_rt; 143109409Shsu ola = la; 14471999Sphk la = LIST_NEXT(la, la_le); 14534961Sphk if (rt->rt_expire && rt->rt_expire <= time_second) 146109409Shsu arptfree(ola); /* timer has expired, clear */ 1471541Srgrimes } 148109996Shsu RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET]); 149120727Ssam 150120727Ssam callout_reset(&arp_callout, arpt_prune * hz, arptimer, NULL); 1511541Srgrimes} 1521541Srgrimes 1531541Srgrimes/* 1541541Srgrimes * Parallel to llc_rtrequest. 1551541Srgrimes */ 1565196Swollmanstatic void 15785074Sruarp_rtrequest(req, rt, info) 1581541Srgrimes int req; 159126936Smdodd struct rtentry *rt; 16085074Sru struct rt_addrinfo *info; 1611541Srgrimes{ 162126936Smdodd struct sockaddr *gate; 163126936Smdodd struct llinfo_arp *la; 1641541Srgrimes static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 165138615Smlaier struct in_ifaddr *ia; 166138615Smlaier struct ifaddr *ifa; 1671541Srgrimes 168120727Ssam RT_LOCK_ASSERT(rt); 169120727Ssam 1701541Srgrimes if (rt->rt_flags & RTF_GATEWAY) 1711541Srgrimes return; 172120727Ssam gate = rt->rt_gateway; 173120727Ssam la = (struct llinfo_arp *)rt->rt_llinfo; 1741541Srgrimes switch (req) { 1751541Srgrimes 1761541Srgrimes case RTM_ADD: 1771541Srgrimes /* 1781541Srgrimes * XXX: If this is a manually added route to interface 1791541Srgrimes * such as older version of routed or gated might provide, 1801541Srgrimes * restore cloning bit. 1811541Srgrimes */ 1821541Srgrimes if ((rt->rt_flags & RTF_HOST) == 0 && 183136960Sbms rt_mask(rt) != NULL && 1841541Srgrimes SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1851541Srgrimes rt->rt_flags |= RTF_CLONING; 1861541Srgrimes if (rt->rt_flags & RTF_CLONING) { 1871541Srgrimes /* 1881541Srgrimes * Case 1: This route should come from a route to iface. 1891541Srgrimes */ 1901541Srgrimes rt_setgate(rt, rt_key(rt), 1911541Srgrimes (struct sockaddr *)&null_sdl); 1921541Srgrimes gate = rt->rt_gateway; 1931541Srgrimes SDL(gate)->sdl_type = rt->rt_ifp->if_type; 1941541Srgrimes SDL(gate)->sdl_index = rt->rt_ifp->if_index; 19534961Sphk rt->rt_expire = time_second; 1961541Srgrimes break; 1971541Srgrimes } 1981541Srgrimes /* Announce a new entry if requested. */ 1991541Srgrimes if (rt->rt_flags & RTF_ANNOUNCE) 20084931Sfjoe arprequest(rt->rt_ifp, 20136908Sjulian &SIN(rt_key(rt))->sin_addr, 20236908Sjulian &SIN(rt_key(rt))->sin_addr, 2031541Srgrimes (u_char *)LLADDR(SDL(gate))); 2041541Srgrimes /*FALLTHROUGH*/ 2051541Srgrimes case RTM_RESOLVE: 2061541Srgrimes if (gate->sa_family != AF_LINK || 2071541Srgrimes gate->sa_len < sizeof(null_sdl)) { 208120727Ssam log(LOG_DEBUG, "%s: bad gateway %s%s\n", __func__, 209120698Sbms inet_ntoa(SIN(rt_key(rt))->sin_addr), 210120698Sbms (gate->sa_family != AF_LINK) ? 211120699Sbms " (!AF_LINK)": ""); 2121541Srgrimes break; 2131541Srgrimes } 2141541Srgrimes SDL(gate)->sdl_type = rt->rt_ifp->if_type; 2151541Srgrimes SDL(gate)->sdl_index = rt->rt_ifp->if_index; 2161541Srgrimes if (la != 0) 2171541Srgrimes break; /* This happens on a route change */ 2181541Srgrimes /* 2191541Srgrimes * Case 2: This route may come from cloning, or a manual route 2201541Srgrimes * add with a LL address. 2211541Srgrimes */ 222120727Ssam R_Zalloc(la, struct llinfo_arp *, sizeof(*la)); 2231541Srgrimes rt->rt_llinfo = (caddr_t)la; 2241541Srgrimes if (la == 0) { 225120727Ssam log(LOG_DEBUG, "%s: malloc failed\n", __func__); 2261541Srgrimes break; 2271541Srgrimes } 228120727Ssam arp_allocated++; 2291541Srgrimes la->la_rt = rt; 2301541Srgrimes rt->rt_flags |= RTF_LLINFO; 231109996Shsu RADIX_NODE_HEAD_LOCK_ASSERT(rt_tables[AF_INET]); 23211225Swollman LIST_INSERT_HEAD(&llinfo_arp, la, la_le); 23313926Swollman 23432350Seivind#ifdef INET 23513926Swollman /* 23613926Swollman * This keeps the multicast addresses from showing up 23713926Swollman * in `arp -a' listings as unresolved. It's not actually 23813926Swollman * functional. Then the same for broadcast. 23913926Swollman */ 24087776Sjlemon if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr)) && 24187776Sjlemon rt->rt_ifp->if_type != IFT_ARCNET) { 24213926Swollman ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr, 24313926Swollman LLADDR(SDL(gate))); 24413926Swollman SDL(gate)->sdl_alen = 6; 24516576Speter rt->rt_expire = 0; 24613926Swollman } 24713926Swollman if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) { 24884931Sfjoe memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr, 24984931Sfjoe rt->rt_ifp->if_addrlen); 25084931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen; 25116576Speter rt->rt_expire = 0; 25213926Swollman } 25332350Seivind#endif 25413926Swollman 255138615Smlaier TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 256138615Smlaier if (ia->ia_ifp == rt->rt_ifp && 257138615Smlaier SIN(rt_key(rt))->sin_addr.s_addr == 258138615Smlaier (IA_SIN(ia))->sin_addr.s_addr) 259138615Smlaier break; 260138615Smlaier } 261138615Smlaier if (ia) { 2621541Srgrimes /* 2631541Srgrimes * This test used to be 2641541Srgrimes * if (loif.if_flags & IFF_UP) 2651541Srgrimes * It allowed local traffic to be forced 2661541Srgrimes * through the hardware by configuring the loopback down. 2671541Srgrimes * However, it causes problems during network configuration 2681541Srgrimes * for boards that can't receive packets they send. 2691541Srgrimes * It is now necessary to clear "useloopback" and remove 2701541Srgrimes * the route to force traffic out to the hardware. 2711541Srgrimes */ 2721541Srgrimes rt->rt_expire = 0; 273128398Sluigi bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)), 27484931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen); 2751541Srgrimes if (useloopback) 2768090Spst rt->rt_ifp = loif; 2771541Srgrimes 278138615Smlaier /* 279138615Smlaier * make sure to set rt->rt_ifa to the interface 280138615Smlaier * address we are using, otherwise we will have trouble 281138615Smlaier * with source address selection. 282138615Smlaier */ 283138615Smlaier ifa = &ia->ia_ifa; 284138615Smlaier if (ifa != rt->rt_ifa) { 285138615Smlaier IFAFREE(rt->rt_ifa); 286138615Smlaier IFAREF(ifa); 287138615Smlaier rt->rt_ifa = ifa; 288138615Smlaier } 2891541Srgrimes } 2901541Srgrimes break; 2911541Srgrimes 2921541Srgrimes case RTM_DELETE: 2931541Srgrimes if (la == 0) 2941541Srgrimes break; 295109996Shsu RADIX_NODE_HEAD_LOCK_ASSERT(rt_tables[AF_INET]); 29611225Swollman LIST_REMOVE(la, la_le); 2971541Srgrimes rt->rt_llinfo = 0; 2981541Srgrimes rt->rt_flags &= ~RTF_LLINFO; 2991541Srgrimes if (la->la_hold) 3001541Srgrimes m_freem(la->la_hold); 3011541Srgrimes Free((caddr_t)la); 3021541Srgrimes } 3031541Srgrimes} 3041541Srgrimes 3051541Srgrimes/* 3061541Srgrimes * Broadcast an ARP request. Caller specifies: 3071541Srgrimes * - arp header source ip address 3081541Srgrimes * - arp header target ip address 3091541Srgrimes * - arp header source ethernet address 3101541Srgrimes */ 3111541Srgrimesstatic void 31284931Sfjoearprequest(ifp, sip, tip, enaddr) 313126936Smdodd struct ifnet *ifp; 314126936Smdodd struct in_addr *sip, *tip; 315126936Smdodd u_char *enaddr; 3161541Srgrimes{ 317126936Smdodd struct mbuf *m; 318126936Smdodd struct arphdr *ah; 3191541Srgrimes struct sockaddr sa; 3201541Srgrimes 321111119Simp if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) 3221541Srgrimes return; 323127261Smdodd m->m_len = sizeof(*ah) + 2*sizeof(struct in_addr) + 324127261Smdodd 2*ifp->if_data.ifi_addrlen; 325127277Smdodd m->m_pkthdr.len = m->m_len; 326127277Smdodd MH_ALIGN(m, m->m_len); 327127277Smdodd ah = mtod(m, struct arphdr *); 328127261Smdodd bzero((caddr_t)ah, m->m_len); 329101090Srwatson#ifdef MAC 330101090Srwatson mac_create_mbuf_linklayer(ifp, m); 331101090Srwatson#endif 33284931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); 33384931Sfjoe ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 33484931Sfjoe ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 33584931Sfjoe ah->ar_op = htons(ARPOP_REQUEST); 336127261Smdodd bcopy((caddr_t)enaddr, (caddr_t)ar_sha(ah), ah->ar_hln); 337127261Smdodd bcopy((caddr_t)sip, (caddr_t)ar_spa(ah), ah->ar_pln); 338127261Smdodd bcopy((caddr_t)tip, (caddr_t)ar_tpa(ah), ah->ar_pln); 339127261Smdodd sa.sa_family = AF_ARP; 340127261Smdodd sa.sa_len = 2; 341127261Smdodd m->m_flags |= M_BCAST; 342127261Smdodd (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 34384931Sfjoe 344127261Smdodd return; 3451541Srgrimes} 3461541Srgrimes 3471541Srgrimes/* 348128636Sluigi * Resolve an IP address into an ethernet address. 349128636Sluigi * On input: 350128636Sluigi * ifp is the interface we use 351128636Sluigi * dst is the next hop, 352128636Sluigi * rt0 is the route to the final destination (possibly useless) 353128636Sluigi * m is the mbuf 354128636Sluigi * desten is where we want the address. 355128636Sluigi * 356128636Sluigi * On success, desten is filled in and the function returns 0; 357128636Sluigi * If the packet must be held pending resolution, we return EWOULDBLOCK 358128636Sluigi * On other errors, we return the corresponding error code. 3591541Srgrimes */ 3601541Srgrimesint 361128636Sluigiarpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 362127828Sluigi struct sockaddr *dst, u_char *desten) 3631541Srgrimes{ 36478295Sjlemon struct llinfo_arp *la = 0; 3651541Srgrimes struct sockaddr_dl *sdl; 366128636Sluigi int error; 367128636Sluigi struct rtentry *rt; 3681541Srgrimes 369128636Sluigi error = rt_check(&rt, &rt0, dst); 370128636Sluigi if (error) { 371128636Sluigi m_freem(m); 372128636Sluigi return error; 373128636Sluigi } 374128636Sluigi 3751541Srgrimes if (m->m_flags & M_BCAST) { /* broadcast */ 37684931Sfjoe (void)memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen); 377128636Sluigi return (0); 3781541Srgrimes } 37984931Sfjoe if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {/* multicast */ 3801541Srgrimes ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten); 381128636Sluigi return (0); 3821541Srgrimes } 3831541Srgrimes if (rt) 3841541Srgrimes la = (struct llinfo_arp *)rt->rt_llinfo; 38542775Sfenner if (la == 0) { 3863311Sphk la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0); 3873311Sphk if (la) 3881541Srgrimes rt = la->la_rt; 3891541Srgrimes } 3901541Srgrimes if (la == 0 || rt == 0) { 39136308Sphk log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n", 39236308Sphk inet_ntoa(SIN(dst)->sin_addr), la ? "la" : "", 39336308Sphk rt ? "rt" : ""); 3941541Srgrimes m_freem(m); 395128636Sluigi return (EINVAL); /* XXX */ 3961541Srgrimes } 3971541Srgrimes sdl = SDL(rt->rt_gateway); 3981541Srgrimes /* 3991541Srgrimes * Check the address family and length is valid, the address 4001541Srgrimes * is resolved; otherwise, try to resolve. 4011541Srgrimes */ 40234961Sphk if ((rt->rt_expire == 0 || rt->rt_expire > time_second) && 4031541Srgrimes sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) { 40492802Sorion /* 40592802Sorion * If entry has an expiry time and it is approaching, 40692802Sorion * see if we need to send an ARP request within this 40792802Sorion * arpt_down interval. 40892802Sorion */ 40992802Sorion if ((rt->rt_expire != 0) && 410110544Sorion (time_second + la->la_preempt > rt->rt_expire)) { 41192802Sorion arprequest(ifp, 41292802Sorion &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 41392802Sorion &SIN(dst)->sin_addr, 41492802Sorion IF_LLADDR(ifp)); 415110544Sorion la->la_preempt--; 41692802Sorion } 41792802Sorion 41816206Sbde bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 419128636Sluigi return (0); 4201541Srgrimes } 4211541Srgrimes /* 422120626Sru * If ARP is disabled or static on this interface, stop. 42378295Sjlemon * XXX 42478295Sjlemon * Probably should not allocate empty llinfo struct if we are 42578295Sjlemon * not going to be sending out an arp request. 42678295Sjlemon */ 427120626Sru if (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) { 42887410Sru m_freem(m); 429128636Sluigi return (EINVAL); 43087410Sru } 43178295Sjlemon /* 4321541Srgrimes * There is an arptab entry, but no ethernet address 4331541Srgrimes * response yet. Replace the held mbuf with this 4341541Srgrimes * latest one. 4351541Srgrimes */ 4361541Srgrimes if (la->la_hold) 4371541Srgrimes m_freem(la->la_hold); 4381541Srgrimes la->la_hold = m; 4391541Srgrimes if (rt->rt_expire) { 440120727Ssam RT_LOCK(rt); 4411541Srgrimes rt->rt_flags &= ~RTF_REJECT; 44234961Sphk if (la->la_asked == 0 || rt->rt_expire != time_second) { 44334961Sphk rt->rt_expire = time_second; 444110308Sorion if (la->la_asked++ < arp_maxtries) { 445110308Sorion arprequest(ifp, 446110308Sorion &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 447110308Sorion &SIN(dst)->sin_addr, 448110308Sorion IF_LLADDR(ifp)); 449110308Sorion } else { 4501541Srgrimes rt->rt_flags |= RTF_REJECT; 4511541Srgrimes rt->rt_expire += arpt_down; 452110544Sorion la->la_asked = 0; 453110544Sorion la->la_preempt = arp_maxtries; 4541541Srgrimes } 4551541Srgrimes 4561541Srgrimes } 457120727Ssam RT_UNLOCK(rt); 4581541Srgrimes } 459128636Sluigi return (EWOULDBLOCK); 4601541Srgrimes} 4611541Srgrimes 4621541Srgrimes/* 4631541Srgrimes * Common length and type checks are done here, 4641541Srgrimes * then the protocol-specific routine is called. 4651541Srgrimes */ 46612693Sphkstatic void 467111888Sjlemonarpintr(struct mbuf *m) 4681541Srgrimes{ 469111888Sjlemon struct arphdr *ar; 4701541Srgrimes 471111888Sjlemon if (m->m_len < sizeof(struct arphdr) && 472111888Sjlemon ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) { 473111888Sjlemon log(LOG_ERR, "arp: runt packet -- m_pullup failed\n"); 474111888Sjlemon return; 475111888Sjlemon } 476111888Sjlemon ar = mtod(m, struct arphdr *); 4771541Srgrimes 478111888Sjlemon if (ntohs(ar->ar_hrd) != ARPHRD_ETHER && 479111888Sjlemon ntohs(ar->ar_hrd) != ARPHRD_IEEE802 && 480130407Sdfr ntohs(ar->ar_hrd) != ARPHRD_ARCNET && 481130407Sdfr ntohs(ar->ar_hrd) != ARPHRD_IEEE1394) { 482111888Sjlemon log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n", 483111888Sjlemon (unsigned char *)&ar->ar_hrd, ""); 484111888Sjlemon m_freem(m); 485111888Sjlemon return; 486111888Sjlemon } 4871541Srgrimes 488123768Sru if (m->m_len < arphdr_len(ar)) { 489123765Sru if ((m = m_pullup(m, arphdr_len(ar))) == NULL) { 490123765Sru log(LOG_ERR, "arp: runt packet\n"); 491123765Sru m_freem(m); 492123765Sru return; 493123765Sru } 494123765Sru ar = mtod(m, struct arphdr *); 495111888Sjlemon } 49657900Srwatson 497111888Sjlemon switch (ntohs(ar->ar_pro)) { 49832350Seivind#ifdef INET 499111888Sjlemon case ETHERTYPE_IP: 500111888Sjlemon in_arpinput(m); 501111888Sjlemon return; 50232350Seivind#endif 5031541Srgrimes } 504111888Sjlemon m_freem(m); 5051541Srgrimes} 5061541Srgrimes 50732350Seivind#ifdef INET 5081541Srgrimes/* 5091541Srgrimes * ARP for Internet protocols on 10 Mb/s Ethernet. 5101541Srgrimes * Algorithm is that given in RFC 826. 5111541Srgrimes * In addition, a sanity check is performed on the sender 5121541Srgrimes * protocol address, to catch impersonators. 5131541Srgrimes * We no longer handle negotiations for use of trailer protocol: 5141541Srgrimes * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent 5151541Srgrimes * along with IP replies if we wanted trailers sent to us, 5161541Srgrimes * and also sent them in response to IP replies. 5171541Srgrimes * This allowed either end to announce the desire to receive 5181541Srgrimes * trailer packets. 5191541Srgrimes * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, 5201541Srgrimes * but formerly didn't normally send requests. 5211541Srgrimes */ 52270699Salfredstatic int log_arp_wrong_iface = 1; 52382893Salfredstatic int log_arp_movements = 1; 52470699Salfred 52570699SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW, 52670699Salfred &log_arp_wrong_iface, 0, 52770699Salfred "log arp packets arriving on the wrong interface"); 52882893SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW, 52982893Salfred &log_arp_movements, 0, 53082966Salfred "log arp replies from MACs different than the one in the cache"); 53170699Salfred 53282893Salfred 5331541Srgrimesstatic void 5341541Srgrimesin_arpinput(m) 5351541Srgrimes struct mbuf *m; 5361541Srgrimes{ 537126936Smdodd struct arphdr *ah; 538126936Smdodd struct ifnet *ifp = m->m_pkthdr.rcvif; 53944627Sjulian struct iso88025_header *th = (struct iso88025_header *)0; 54096184Skbyanc struct iso88025_sockaddr_dl_data *trld; 541126936Smdodd struct llinfo_arp *la = 0; 542126936Smdodd struct rtentry *rt; 54384102Sjlemon struct ifaddr *ifa; 54484102Sjlemon struct in_ifaddr *ia; 5451541Srgrimes struct sockaddr_dl *sdl; 5461541Srgrimes struct sockaddr sa; 5471541Srgrimes struct in_addr isaddr, itaddr, myaddr; 54858313Slile int op, rif_len; 54984931Sfjoe int req_len; 5501541Srgrimes 55184931Sfjoe req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 55284931Sfjoe if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) { 55374851Syar log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); 55474851Syar return; 55574851Syar } 55674851Syar 55784931Sfjoe ah = mtod(m, struct arphdr *); 55884931Sfjoe op = ntohs(ah->ar_op); 55984931Sfjoe (void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr)); 56084931Sfjoe (void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr)); 561134991Sglebius 56284102Sjlemon /* 56384102Sjlemon * For a bridge, we want to check the address irrespective 56484102Sjlemon * of the receive interface. (This will change slightly 56584102Sjlemon * when we have clusters of interfaces). 56684102Sjlemon */ 56784102Sjlemon LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) 568134991Sglebius if ((do_bridge || (ia->ia_ifp == ifp)) && 56984102Sjlemon itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 57084102Sjlemon goto match; 57184102Sjlemon LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash) 572134991Sglebius if ((do_bridge || (ia->ia_ifp == ifp)) && 57384102Sjlemon isaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 57484102Sjlemon goto match; 57584102Sjlemon /* 57685223Sjlemon * No match, use the first inet address on the receive interface 57784102Sjlemon * as a dummy address for the rest of the function. 57884102Sjlemon */ 57985223Sjlemon TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 58085466Sjlemon if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 58185466Sjlemon ia = ifatoia(ifa); 58285466Sjlemon goto match; 58385466Sjlemon } 58485466Sjlemon /* 58585466Sjlemon * If bridging, fall back to using any inet address. 58685466Sjlemon */ 587134991Sglebius if (!do_bridge || (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL) 588128645Sluigi goto drop; 58984102Sjlemonmatch: 59084102Sjlemon myaddr = ia->ia_addr.sin_addr; 591128645Sluigi if (!bcmp(ar_sha(ah), IF_LLADDR(ifp), ifp->if_addrlen)) 592128645Sluigi goto drop; /* it's from me, ignore it. */ 59384931Sfjoe if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { 5941541Srgrimes log(LOG_ERR, 59584931Sfjoe "arp: link address is broadcast for IP address %s!\n", 5967088Swollman inet_ntoa(isaddr)); 597128645Sluigi goto drop; 5981541Srgrimes } 599136441Srwatson /* 600136441Srwatson * Warn if another host is using the same IP address, but only if the 601136441Srwatson * IP address isn't 0.0.0.0, which is used for DHCP only, in which 602136441Srwatson * case we suppress the warning to avoid false positive complaints of 603136441Srwatson * potential misconfiguration. 604136441Srwatson */ 605136441Srwatson if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) { 6061541Srgrimes log(LOG_ERR, 60784931Sfjoe "arp: %*D is using my IP address %s!\n", 60884931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 60984931Sfjoe inet_ntoa(isaddr)); 6101541Srgrimes itaddr = myaddr; 6111541Srgrimes goto reply; 6121541Srgrimes } 613120626Sru if (ifp->if_flags & IFF_STATICARP) 614120626Sru goto reply; 6151541Srgrimes la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0); 6161541Srgrimes if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) { 61772270Sluigi /* the following is not an error when doing bridging */ 618134991Sglebius if (!do_bridge && rt->rt_ifp != ifp) { 61972270Sluigi if (log_arp_wrong_iface) 620121816Sbrooks log(LOG_ERR, "arp: %s is on %s but got reply from %*D on %s\n", 62171963Sjulian inet_ntoa(isaddr), 622121816Sbrooks rt->rt_ifp->if_xname, 62384931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 624121816Sbrooks ifp->if_xname); 62572270Sluigi goto reply; 62639389Sfenner } 6271541Srgrimes if (sdl->sdl_alen && 62884931Sfjoe bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) { 62982893Salfred if (rt->rt_expire) { 63082893Salfred if (log_arp_movements) 631121816Sbrooks log(LOG_INFO, "arp: %s moved from %*D to %*D on %s\n", 63284931Sfjoe inet_ntoa(isaddr), 63384931Sfjoe ifp->if_addrlen, (u_char *)LLADDR(sdl), ":", 63484931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 635121816Sbrooks ifp->if_xname); 63682893Salfred } else { 63739389Sfenner log(LOG_ERR, 638121816Sbrooks "arp: %*D attempts to modify permanent entry for %s on %s\n", 63984931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 640121816Sbrooks inet_ntoa(isaddr), ifp->if_xname); 64139389Sfenner goto reply; 64239389Sfenner } 64346568Speter } 64484931Sfjoe /* 64584931Sfjoe * sanity check for the address length. 64684931Sfjoe * XXX this does not work for protocols with variable address 64784931Sfjoe * length. -is 64884931Sfjoe */ 64984931Sfjoe if (sdl->sdl_alen && 65084931Sfjoe sdl->sdl_alen != ah->ar_hln) { 65184931Sfjoe log(LOG_WARNING, 65284931Sfjoe "arp from %*D: new addr len %d, was %d", 65384931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 65484931Sfjoe ah->ar_hln, sdl->sdl_alen); 65584931Sfjoe } 65684931Sfjoe if (ifp->if_addrlen != ah->ar_hln) { 65784931Sfjoe log(LOG_WARNING, 65884931Sfjoe "arp from %*D: addr len: new %d, i/f %d (ignored)", 65984931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 66084931Sfjoe ah->ar_hln, ifp->if_addrlen); 66184931Sfjoe goto reply; 66284931Sfjoe } 66384931Sfjoe (void)memcpy(LLADDR(sdl), ar_sha(ah), 66484931Sfjoe sdl->sdl_alen = ah->ar_hln); 66545705Seivind /* 66645705Seivind * If we receive an arp from a token-ring station over 66745705Seivind * a token-ring nic then try to save the source 66845705Seivind * routing info. 66945705Seivind */ 67084931Sfjoe if (ifp->if_type == IFT_ISO88025) { 67144627Sjulian th = (struct iso88025_header *)m->m_pkthdr.header; 67296184Skbyanc trld = SDL_ISO88025(sdl); 67358313Slile rif_len = TR_RCF_RIFLEN(th->rcf); 67458313Slile if ((th->iso88025_shost[0] & TR_RII) && 67558313Slile (rif_len > 2)) { 67696184Skbyanc trld->trld_rcf = th->rcf; 67796184Skbyanc trld->trld_rcf ^= htons(TR_RCF_DIR); 67896184Skbyanc memcpy(trld->trld_route, th->rd, rif_len - 2); 67996184Skbyanc trld->trld_rcf &= ~htons(TR_RCF_BCST_MASK); 68051320Slile /* 68151320Slile * Set up source routing information for 68251320Slile * reply packet (XXX) 68351320Slile */ 68458313Slile m->m_data -= rif_len; 68558313Slile m->m_len += rif_len; 68658313Slile m->m_pkthdr.len += rif_len; 68744627Sjulian } else { 68858313Slile th->iso88025_shost[0] &= ~TR_RII; 68996624Skbyanc trld->trld_rcf = 0; 69044627Sjulian } 69150512Slile m->m_data -= 8; 69250512Slile m->m_len += 8; 69350512Slile m->m_pkthdr.len += 8; 69496184Skbyanc th->rcf = trld->trld_rcf; 69544627Sjulian } 696120727Ssam RT_LOCK(rt); 6971541Srgrimes if (rt->rt_expire) 69834961Sphk rt->rt_expire = time_second + arpt_keep; 6991541Srgrimes rt->rt_flags &= ~RTF_REJECT; 700120727Ssam RT_UNLOCK(rt); 701110544Sorion la->la_asked = 0; 702110544Sorion la->la_preempt = arp_maxtries; 7031541Srgrimes if (la->la_hold) { 704127277Smdodd (*ifp->if_output)(ifp, la->la_hold, rt_key(rt), rt); 7051541Srgrimes la->la_hold = 0; 7061541Srgrimes } 7071541Srgrimes } 7081541Srgrimesreply: 709128645Sluigi if (op != ARPOP_REQUEST) 710128645Sluigi goto drop; 7111541Srgrimes if (itaddr.s_addr == myaddr.s_addr) { 7121541Srgrimes /* I am the target */ 71384931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 71484931Sfjoe (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); 7151541Srgrimes } else { 7161541Srgrimes la = arplookup(itaddr.s_addr, 0, SIN_PROXY); 7173282Swollman if (la == NULL) { 7183282Swollman struct sockaddr_in sin; 7193282Swollman 720128645Sluigi if (!arp_proxyall) 721128645Sluigi goto drop; 7223282Swollman 7233282Swollman bzero(&sin, sizeof sin); 7243282Swollman sin.sin_family = AF_INET; 7253282Swollman sin.sin_len = sizeof sin; 7263282Swollman sin.sin_addr = itaddr; 7273282Swollman 7285101Swollman rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 729128645Sluigi if (!rt) 730128645Sluigi goto drop; 7313282Swollman /* 7323282Swollman * Don't send proxies for nodes on the same interface 7333282Swollman * as this one came out of, or we'll get into a fight 7343282Swollman * over who claims what Ether address. 7353282Swollman */ 73684931Sfjoe if (rt->rt_ifp == ifp) { 7373282Swollman rtfree(rt); 738128645Sluigi goto drop; 7393282Swollman } 74084931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 74184931Sfjoe (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); 7423282Swollman rtfree(rt); 74363080Sdwmalone 74463080Sdwmalone /* 74563080Sdwmalone * Also check that the node which sent the ARP packet 74663080Sdwmalone * is on the the interface we expect it to be on. This 74763080Sdwmalone * avoids ARP chaos if an interface is connected to the 74863080Sdwmalone * wrong network. 74963080Sdwmalone */ 75063080Sdwmalone sin.sin_addr = isaddr; 75163080Sdwmalone 75263080Sdwmalone rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 753128645Sluigi if (!rt) 754128645Sluigi goto drop; 75584931Sfjoe if (rt->rt_ifp != ifp) { 75663080Sdwmalone log(LOG_INFO, "arp_proxy: ignoring request" 757121816Sbrooks " from %s via %s, expecting %s\n", 758121816Sbrooks inet_ntoa(isaddr), ifp->if_xname, 759121816Sbrooks rt->rt_ifp->if_xname); 76063080Sdwmalone rtfree(rt); 761128645Sluigi goto drop; 76263080Sdwmalone } 76363080Sdwmalone rtfree(rt); 76463080Sdwmalone 7654069Swollman#ifdef DEBUG_PROXY 7668876Srgrimes printf("arp: proxying for %s\n", 7677088Swollman inet_ntoa(itaddr)); 7684069Swollman#endif 7693282Swollman } else { 7703282Swollman rt = la->la_rt; 77184931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 7723282Swollman sdl = SDL(rt->rt_gateway); 77384931Sfjoe (void)memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln); 7743282Swollman } 7751541Srgrimes } 7761541Srgrimes 77784931Sfjoe (void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); 77884931Sfjoe (void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln); 77984931Sfjoe ah->ar_op = htons(ARPOP_REPLY); 78084931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ 781127261Smdodd m->m_flags &= ~(M_BCAST|M_MCAST); /* never reply by broadcast */ 782127261Smdodd m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + (2 * ah->ar_hln); 783127261Smdodd m->m_pkthdr.len = m->m_len; 784127261Smdodd sa.sa_family = AF_ARP; 785127261Smdodd sa.sa_len = 2; 78684931Sfjoe (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 7871541Srgrimes return; 788128645Sluigi 789128645Sluigidrop: 790128645Sluigi m_freem(m); 7911541Srgrimes} 79232350Seivind#endif 7931541Srgrimes 7941541Srgrimes/* 7951541Srgrimes * Free an arp entry. 7961541Srgrimes */ 7971541Srgrimesstatic void 7981541Srgrimesarptfree(la) 799126936Smdodd struct llinfo_arp *la; 8001541Srgrimes{ 801126936Smdodd struct rtentry *rt = la->la_rt; 802126936Smdodd struct sockaddr_dl *sdl; 803120727Ssam 8041541Srgrimes if (rt == 0) 8051541Srgrimes panic("arptfree"); 8061541Srgrimes if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) && 8071541Srgrimes sdl->sdl_family == AF_LINK) { 8081541Srgrimes sdl->sdl_alen = 0; 809110308Sorion la->la_preempt = la->la_asked = 0; 810120727Ssam RT_LOCK(rt); /* XXX needed or move higher? */ 8111541Srgrimes rt->rt_flags &= ~RTF_REJECT; 812120727Ssam RT_UNLOCK(rt); 8131541Srgrimes return; 8141541Srgrimes } 8151541Srgrimes rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt), 8161541Srgrimes 0, (struct rtentry **)0); 8171541Srgrimes} 8181541Srgrimes/* 8191541Srgrimes * Lookup or enter a new address in arptab. 8201541Srgrimes */ 8211541Srgrimesstatic struct llinfo_arp * 8221541Srgrimesarplookup(addr, create, proxy) 8231541Srgrimes u_long addr; 8241541Srgrimes int create, proxy; 8251541Srgrimes{ 826126936Smdodd struct rtentry *rt; 827120727Ssam struct sockaddr_inarp sin; 8284069Swollman const char *why = 0; 8291541Srgrimes 830120727Ssam bzero(&sin, sizeof(sin)); 831120727Ssam sin.sin_len = sizeof(sin); 832120727Ssam sin.sin_family = AF_INET; 8331541Srgrimes sin.sin_addr.s_addr = addr; 834120727Ssam if (proxy) 835120727Ssam sin.sin_other = SIN_PROXY; 8365101Swollman rt = rtalloc1((struct sockaddr *)&sin, create, 0UL); 8371541Srgrimes if (rt == 0) 8381541Srgrimes return (0); 8394069Swollman 84012693Sphk if (rt->rt_flags & RTF_GATEWAY) 8414069Swollman why = "host is not on local network"; 84212693Sphk else if ((rt->rt_flags & RTF_LLINFO) == 0) 8434069Swollman why = "could not allocate llinfo"; 84412693Sphk else if (rt->rt_gateway->sa_family != AF_LINK) 8454069Swollman why = "gateway route is not ours"; 8464069Swollman 847120383Sbms if (why) { 848120727Ssam#define ISDYNCLONE(_rt) \ 849120727Ssam (((_rt)->rt_flags & (RTF_STATIC | RTF_WASCLONED)) == RTF_WASCLONED) 850120727Ssam if (create) 851120383Sbms log(LOG_DEBUG, "arplookup %s failed: %s\n", 852120383Sbms inet_ntoa(sin.sin_addr), why); 853120727Ssam /* 854120727Ssam * If there are no references to this Layer 2 route, 855120727Ssam * and it is a cloned route, and not static, and 856120727Ssam * arplookup() is creating the route, then purge 857120727Ssam * it from the routing table as it is probably bogus. 858120727Ssam */ 859121770Ssam if (rt->rt_refcnt == 1 && ISDYNCLONE(rt)) 860121770Ssam rtexpunge(rt); 861121770Ssam RTFREE_LOCKED(rt); 862120383Sbms return (0); 863120727Ssam#undef ISDYNCLONE 864120727Ssam } else { 865122334Ssam RT_REMREF(rt); 866120727Ssam RT_UNLOCK(rt); 867120727Ssam return ((struct llinfo_arp *)rt->rt_llinfo); 8681541Srgrimes } 8691541Srgrimes} 8701541Srgrimes 8715195Swollmanvoid 87284931Sfjoearp_ifinit(ifp, ifa) 87384931Sfjoe struct ifnet *ifp; 8745195Swollman struct ifaddr *ifa; 8755195Swollman{ 87625822Stegge if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) 87784931Sfjoe arprequest(ifp, &IA_SIN(ifa)->sin_addr, 87884931Sfjoe &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp)); 8795195Swollman ifa->ifa_rtrequest = arp_rtrequest; 8805195Swollman ifa->ifa_flags |= RTF_CLONING; 8815195Swollman} 88269152Sjlemon 88369152Sjlemonstatic void 88469152Sjlemonarp_init(void) 88569152Sjlemon{ 88669152Sjlemon 88769152Sjlemon arpintrq.ifq_maxlen = 50; 88893818Sjhb mtx_init(&arpintrq.ifq_mtx, "arp_inq", NULL, MTX_DEF); 88998459Speter LIST_INIT(&llinfo_arp); 890120727Ssam callout_init(&arp_callout, CALLOUT_MPSAFE); 891122320Ssam netisr_register(NETISR_ARP, arpintr, &arpintrq, NETISR_MPSAFE); 892128641Sluigi callout_reset(&arp_callout, hz, arptimer, NULL); 89369152Sjlemon} 89469152SjlemonSYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0); 895