if_ether.c revision 142215
1139823Simp/*- 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 142215 2005-02-22 13:04:05Z glebius $ 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" 42142215Sglebius#include "opt_carp.h" 4332350Seivind 441541Srgrimes#include <sys/param.h> 4512693Sphk#include <sys/kernel.h> 4644078Sdfr#include <sys/queue.h> 4712693Sphk#include <sys/sysctl.h> 481541Srgrimes#include <sys/systm.h> 49101090Srwatson#include <sys/mac.h> 5012693Sphk#include <sys/mbuf.h> 511541Srgrimes#include <sys/malloc.h> 5218892Sbde#include <sys/socket.h> 531541Srgrimes#include <sys/syslog.h> 541541Srgrimes 551541Srgrimes#include <net/if.h> 561541Srgrimes#include <net/if_dl.h> 5744165Sjulian#include <net/if_types.h> 581541Srgrimes#include <net/route.h> 598426Swollman#include <net/netisr.h> 6058313Slile#include <net/if_llc.h> 6171963Sjulian#include <net/ethernet.h> 6271963Sjulian#include <net/bridge.h> 631541Srgrimes 641541Srgrimes#include <netinet/in.h> 651541Srgrimes#include <netinet/in_var.h> 661541Srgrimes#include <netinet/if_ether.h> 671541Srgrimes 6884931Sfjoe#include <net/if_arc.h> 6944627Sjulian#include <net/iso88025.h> 7044627Sjulian 71142215Sglebius#ifdef DEV_CARP 72142215Sglebius#include <netinet/ip_carp.h> 73142215Sglebius#endif 74142215Sglebius 751541Srgrimes#define SIN(s) ((struct sockaddr_in *)s) 761541Srgrimes#define SDL(s) ((struct sockaddr_dl *)s) 771541Srgrimes 7844078SdfrSYSCTL_DECL(_net_link_ether); 7912942SwollmanSYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, ""); 801541Srgrimes 8112693Sphk/* timer values */ 8212942Swollmanstatic int arpt_prune = (5*60*1); /* walk list every 5 minutes */ 8312942Swollmanstatic int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ 8412942Swollmanstatic int arpt_down = 20; /* once declared down, don't send for 20 sec */ 851541Srgrimes 8612942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW, 8712942Swollman &arpt_prune, 0, ""); 8812942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW, 8912942Swollman &arpt_keep, 0, ""); 9012942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW, 9112942Swollman &arpt_down, 0, ""); 9212693Sphk 931541Srgrimes#define rt_expire rt_rmx.rmx_expire 941541Srgrimes 9511225Swollmanstruct llinfo_arp { 9660938Sjake LIST_ENTRY(llinfo_arp) la_le; 9711225Swollman struct rtentry *la_rt; 98110308Sorion struct mbuf *la_hold; /* last packet until resolved/timeout */ 99110544Sorion u_short la_preempt; /* countdown for pre-expiry arps */ 100110308Sorion u_short la_asked; /* #times we QUERIED following expiration */ 10111225Swollman#define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 10211225Swollman}; 10312693Sphk 10460938Sjakestatic LIST_HEAD(, llinfo_arp) llinfo_arp; 10511225Swollman 106111888Sjlemonstatic struct ifqueue arpintrq; 107120727Ssamstatic int arp_allocated; 1081541Srgrimes 10912693Sphkstatic int arp_maxtries = 5; 11012942Swollmanstatic int useloopback = 1; /* use loopback interface for local traffic */ 11112942Swollmanstatic int arp_proxyall = 0; 112120727Ssamstatic struct callout arp_callout; 1133282Swollman 11412942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW, 11512942Swollman &arp_maxtries, 0, ""); 11612942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW, 11712942Swollman &useloopback, 0, ""); 11812942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW, 11912942Swollman &arp_proxyall, 0, ""); 12012693Sphk 12192723Salfredstatic void arp_init(void); 12292723Salfredstatic void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 12392723Salfredstatic void arprequest(struct ifnet *, 12492723Salfred struct in_addr *, struct in_addr *, u_char *); 125111888Sjlemonstatic void arpintr(struct mbuf *); 12692723Salfredstatic void arptfree(struct llinfo_arp *); 12792723Salfredstatic void arptimer(void *); 12812693Sphkstatic struct llinfo_arp 12992723Salfred *arplookup(u_long, int, int); 13032350Seivind#ifdef INET 13192723Salfredstatic void in_arpinput(struct mbuf *); 13232350Seivind#endif 13312693Sphk 1341541Srgrimes/* 1351541Srgrimes * Timeout routine. Age arp_tab entries periodically. 1361541Srgrimes */ 1371541Srgrimes/* ARGSUSED */ 1381541Srgrimesstatic void 1391541Srgrimesarptimer(ignored_arg) 1401541Srgrimes void *ignored_arg; 1411541Srgrimes{ 142109409Shsu struct llinfo_arp *la, *ola; 1431541Srgrimes 144109996Shsu RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET]); 145109409Shsu la = LIST_FIRST(&llinfo_arp); 146109409Shsu while (la != NULL) { 147109409Shsu struct rtentry *rt = la->la_rt; 148109409Shsu ola = la; 14971999Sphk la = LIST_NEXT(la, la_le); 15034961Sphk if (rt->rt_expire && rt->rt_expire <= time_second) 151109409Shsu arptfree(ola); /* timer has expired, clear */ 1521541Srgrimes } 153109996Shsu RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET]); 154120727Ssam 155120727Ssam callout_reset(&arp_callout, arpt_prune * hz, arptimer, NULL); 1561541Srgrimes} 1571541Srgrimes 1581541Srgrimes/* 1591541Srgrimes * Parallel to llc_rtrequest. 1601541Srgrimes */ 1615196Swollmanstatic void 16285074Sruarp_rtrequest(req, rt, info) 1631541Srgrimes int req; 164126936Smdodd struct rtentry *rt; 16585074Sru struct rt_addrinfo *info; 1661541Srgrimes{ 167126936Smdodd struct sockaddr *gate; 168126936Smdodd struct llinfo_arp *la; 1691541Srgrimes static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 170138615Smlaier struct in_ifaddr *ia; 171138615Smlaier struct ifaddr *ifa; 1721541Srgrimes 173120727Ssam RT_LOCK_ASSERT(rt); 174120727Ssam 1751541Srgrimes if (rt->rt_flags & RTF_GATEWAY) 1761541Srgrimes return; 177120727Ssam gate = rt->rt_gateway; 178120727Ssam la = (struct llinfo_arp *)rt->rt_llinfo; 1791541Srgrimes switch (req) { 1801541Srgrimes 1811541Srgrimes case RTM_ADD: 1821541Srgrimes /* 1831541Srgrimes * XXX: If this is a manually added route to interface 1841541Srgrimes * such as older version of routed or gated might provide, 1851541Srgrimes * restore cloning bit. 1861541Srgrimes */ 1871541Srgrimes if ((rt->rt_flags & RTF_HOST) == 0 && 188136960Sbms rt_mask(rt) != NULL && 1891541Srgrimes SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1901541Srgrimes rt->rt_flags |= RTF_CLONING; 1911541Srgrimes if (rt->rt_flags & RTF_CLONING) { 1921541Srgrimes /* 1931541Srgrimes * Case 1: This route should come from a route to iface. 1941541Srgrimes */ 1951541Srgrimes rt_setgate(rt, rt_key(rt), 1961541Srgrimes (struct sockaddr *)&null_sdl); 1971541Srgrimes gate = rt->rt_gateway; 1981541Srgrimes SDL(gate)->sdl_type = rt->rt_ifp->if_type; 1991541Srgrimes SDL(gate)->sdl_index = rt->rt_ifp->if_index; 20034961Sphk rt->rt_expire = time_second; 2011541Srgrimes break; 2021541Srgrimes } 2031541Srgrimes /* Announce a new entry if requested. */ 2041541Srgrimes if (rt->rt_flags & RTF_ANNOUNCE) 20584931Sfjoe arprequest(rt->rt_ifp, 20636908Sjulian &SIN(rt_key(rt))->sin_addr, 20736908Sjulian &SIN(rt_key(rt))->sin_addr, 2081541Srgrimes (u_char *)LLADDR(SDL(gate))); 2091541Srgrimes /*FALLTHROUGH*/ 2101541Srgrimes case RTM_RESOLVE: 2111541Srgrimes if (gate->sa_family != AF_LINK || 2121541Srgrimes gate->sa_len < sizeof(null_sdl)) { 213120727Ssam log(LOG_DEBUG, "%s: bad gateway %s%s\n", __func__, 214120698Sbms inet_ntoa(SIN(rt_key(rt))->sin_addr), 215120698Sbms (gate->sa_family != AF_LINK) ? 216120699Sbms " (!AF_LINK)": ""); 2171541Srgrimes break; 2181541Srgrimes } 2191541Srgrimes SDL(gate)->sdl_type = rt->rt_ifp->if_type; 2201541Srgrimes SDL(gate)->sdl_index = rt->rt_ifp->if_index; 2211541Srgrimes if (la != 0) 2221541Srgrimes break; /* This happens on a route change */ 2231541Srgrimes /* 2241541Srgrimes * Case 2: This route may come from cloning, or a manual route 2251541Srgrimes * add with a LL address. 2261541Srgrimes */ 227120727Ssam R_Zalloc(la, struct llinfo_arp *, sizeof(*la)); 2281541Srgrimes rt->rt_llinfo = (caddr_t)la; 2291541Srgrimes if (la == 0) { 230120727Ssam log(LOG_DEBUG, "%s: malloc failed\n", __func__); 2311541Srgrimes break; 2321541Srgrimes } 233120727Ssam arp_allocated++; 2341541Srgrimes la->la_rt = rt; 2351541Srgrimes rt->rt_flags |= RTF_LLINFO; 236109996Shsu RADIX_NODE_HEAD_LOCK_ASSERT(rt_tables[AF_INET]); 23711225Swollman LIST_INSERT_HEAD(&llinfo_arp, la, la_le); 23813926Swollman 23932350Seivind#ifdef INET 24013926Swollman /* 24113926Swollman * This keeps the multicast addresses from showing up 24213926Swollman * in `arp -a' listings as unresolved. It's not actually 24313926Swollman * functional. Then the same for broadcast. 24413926Swollman */ 24587776Sjlemon if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr)) && 24687776Sjlemon rt->rt_ifp->if_type != IFT_ARCNET) { 24713926Swollman ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr, 24813926Swollman LLADDR(SDL(gate))); 24913926Swollman SDL(gate)->sdl_alen = 6; 25016576Speter rt->rt_expire = 0; 25113926Swollman } 25213926Swollman if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) { 25384931Sfjoe memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr, 25484931Sfjoe rt->rt_ifp->if_addrlen); 25584931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen; 25616576Speter rt->rt_expire = 0; 25713926Swollman } 25832350Seivind#endif 25913926Swollman 260138615Smlaier TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) { 261138615Smlaier if (ia->ia_ifp == rt->rt_ifp && 262138615Smlaier SIN(rt_key(rt))->sin_addr.s_addr == 263138615Smlaier (IA_SIN(ia))->sin_addr.s_addr) 264138615Smlaier break; 265138615Smlaier } 266138615Smlaier if (ia) { 2671541Srgrimes /* 2681541Srgrimes * This test used to be 2691541Srgrimes * if (loif.if_flags & IFF_UP) 2701541Srgrimes * It allowed local traffic to be forced 2711541Srgrimes * through the hardware by configuring the loopback down. 2721541Srgrimes * However, it causes problems during network configuration 2731541Srgrimes * for boards that can't receive packets they send. 2741541Srgrimes * It is now necessary to clear "useloopback" and remove 2751541Srgrimes * the route to force traffic out to the hardware. 2761541Srgrimes */ 2771541Srgrimes rt->rt_expire = 0; 278128398Sluigi bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)), 27984931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen); 2801541Srgrimes if (useloopback) 2818090Spst rt->rt_ifp = loif; 2821541Srgrimes 283138615Smlaier /* 284138615Smlaier * make sure to set rt->rt_ifa to the interface 285138615Smlaier * address we are using, otherwise we will have trouble 286138615Smlaier * with source address selection. 287138615Smlaier */ 288138615Smlaier ifa = &ia->ia_ifa; 289138615Smlaier if (ifa != rt->rt_ifa) { 290138615Smlaier IFAFREE(rt->rt_ifa); 291138615Smlaier IFAREF(ifa); 292138615Smlaier rt->rt_ifa = ifa; 293138615Smlaier } 2941541Srgrimes } 2951541Srgrimes break; 2961541Srgrimes 2971541Srgrimes case RTM_DELETE: 2981541Srgrimes if (la == 0) 2991541Srgrimes break; 300109996Shsu RADIX_NODE_HEAD_LOCK_ASSERT(rt_tables[AF_INET]); 30111225Swollman LIST_REMOVE(la, la_le); 3021541Srgrimes rt->rt_llinfo = 0; 3031541Srgrimes rt->rt_flags &= ~RTF_LLINFO; 3041541Srgrimes if (la->la_hold) 3051541Srgrimes m_freem(la->la_hold); 3061541Srgrimes Free((caddr_t)la); 3071541Srgrimes } 3081541Srgrimes} 3091541Srgrimes 3101541Srgrimes/* 3111541Srgrimes * Broadcast an ARP request. Caller specifies: 3121541Srgrimes * - arp header source ip address 3131541Srgrimes * - arp header target ip address 3141541Srgrimes * - arp header source ethernet address 3151541Srgrimes */ 3161541Srgrimesstatic void 31784931Sfjoearprequest(ifp, sip, tip, enaddr) 318126936Smdodd struct ifnet *ifp; 319126936Smdodd struct in_addr *sip, *tip; 320126936Smdodd u_char *enaddr; 3211541Srgrimes{ 322126936Smdodd struct mbuf *m; 323126936Smdodd struct arphdr *ah; 3241541Srgrimes struct sockaddr sa; 3251541Srgrimes 326111119Simp if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) 3271541Srgrimes return; 328127261Smdodd m->m_len = sizeof(*ah) + 2*sizeof(struct in_addr) + 329127261Smdodd 2*ifp->if_data.ifi_addrlen; 330127277Smdodd m->m_pkthdr.len = m->m_len; 331127277Smdodd MH_ALIGN(m, m->m_len); 332127277Smdodd ah = mtod(m, struct arphdr *); 333127261Smdodd bzero((caddr_t)ah, m->m_len); 334101090Srwatson#ifdef MAC 335101090Srwatson mac_create_mbuf_linklayer(ifp, m); 336101090Srwatson#endif 33784931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); 33884931Sfjoe ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 33984931Sfjoe ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 34084931Sfjoe ah->ar_op = htons(ARPOP_REQUEST); 341127261Smdodd bcopy((caddr_t)enaddr, (caddr_t)ar_sha(ah), ah->ar_hln); 342127261Smdodd bcopy((caddr_t)sip, (caddr_t)ar_spa(ah), ah->ar_pln); 343127261Smdodd bcopy((caddr_t)tip, (caddr_t)ar_tpa(ah), ah->ar_pln); 344127261Smdodd sa.sa_family = AF_ARP; 345127261Smdodd sa.sa_len = 2; 346127261Smdodd m->m_flags |= M_BCAST; 347127261Smdodd (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 34884931Sfjoe 349127261Smdodd return; 3501541Srgrimes} 3511541Srgrimes 3521541Srgrimes/* 353128636Sluigi * Resolve an IP address into an ethernet address. 354128636Sluigi * On input: 355128636Sluigi * ifp is the interface we use 356128636Sluigi * dst is the next hop, 357128636Sluigi * rt0 is the route to the final destination (possibly useless) 358128636Sluigi * m is the mbuf 359128636Sluigi * desten is where we want the address. 360128636Sluigi * 361128636Sluigi * On success, desten is filled in and the function returns 0; 362128636Sluigi * If the packet must be held pending resolution, we return EWOULDBLOCK 363128636Sluigi * On other errors, we return the corresponding error code. 3641541Srgrimes */ 3651541Srgrimesint 366128636Sluigiarpresolve(struct ifnet *ifp, struct rtentry *rt0, struct mbuf *m, 367127828Sluigi struct sockaddr *dst, u_char *desten) 3681541Srgrimes{ 36978295Sjlemon struct llinfo_arp *la = 0; 3701541Srgrimes struct sockaddr_dl *sdl; 371128636Sluigi int error; 372128636Sluigi struct rtentry *rt; 3731541Srgrimes 374128636Sluigi error = rt_check(&rt, &rt0, dst); 375128636Sluigi if (error) { 376128636Sluigi m_freem(m); 377128636Sluigi return error; 378128636Sluigi } 379128636Sluigi 3801541Srgrimes if (m->m_flags & M_BCAST) { /* broadcast */ 38184931Sfjoe (void)memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen); 382128636Sluigi return (0); 3831541Srgrimes } 38484931Sfjoe if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {/* multicast */ 3851541Srgrimes ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten); 386128636Sluigi return (0); 3871541Srgrimes } 3881541Srgrimes if (rt) 3891541Srgrimes la = (struct llinfo_arp *)rt->rt_llinfo; 39042775Sfenner if (la == 0) { 3913311Sphk la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0); 3923311Sphk if (la) 3931541Srgrimes rt = la->la_rt; 3941541Srgrimes } 3951541Srgrimes if (la == 0 || rt == 0) { 39636308Sphk log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n", 39736308Sphk inet_ntoa(SIN(dst)->sin_addr), la ? "la" : "", 39836308Sphk rt ? "rt" : ""); 3991541Srgrimes m_freem(m); 400128636Sluigi return (EINVAL); /* XXX */ 4011541Srgrimes } 4021541Srgrimes sdl = SDL(rt->rt_gateway); 4031541Srgrimes /* 4041541Srgrimes * Check the address family and length is valid, the address 4051541Srgrimes * is resolved; otherwise, try to resolve. 4061541Srgrimes */ 40734961Sphk if ((rt->rt_expire == 0 || rt->rt_expire > time_second) && 4081541Srgrimes sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) { 40992802Sorion /* 41092802Sorion * If entry has an expiry time and it is approaching, 41192802Sorion * see if we need to send an ARP request within this 41292802Sorion * arpt_down interval. 41392802Sorion */ 41492802Sorion if ((rt->rt_expire != 0) && 415110544Sorion (time_second + la->la_preempt > rt->rt_expire)) { 41692802Sorion arprequest(ifp, 41792802Sorion &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 41892802Sorion &SIN(dst)->sin_addr, 41992802Sorion IF_LLADDR(ifp)); 420110544Sorion la->la_preempt--; 42192802Sorion } 42292802Sorion 42316206Sbde bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 424128636Sluigi return (0); 4251541Srgrimes } 4261541Srgrimes /* 427120626Sru * If ARP is disabled or static on this interface, stop. 42878295Sjlemon * XXX 42978295Sjlemon * Probably should not allocate empty llinfo struct if we are 43078295Sjlemon * not going to be sending out an arp request. 43178295Sjlemon */ 432120626Sru if (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) { 43387410Sru m_freem(m); 434128636Sluigi return (EINVAL); 43587410Sru } 43678295Sjlemon /* 4371541Srgrimes * There is an arptab entry, but no ethernet address 4381541Srgrimes * response yet. Replace the held mbuf with this 4391541Srgrimes * latest one. 4401541Srgrimes */ 4411541Srgrimes if (la->la_hold) 4421541Srgrimes m_freem(la->la_hold); 4431541Srgrimes la->la_hold = m; 4441541Srgrimes if (rt->rt_expire) { 445120727Ssam RT_LOCK(rt); 4461541Srgrimes rt->rt_flags &= ~RTF_REJECT; 44734961Sphk if (la->la_asked == 0 || rt->rt_expire != time_second) { 44834961Sphk rt->rt_expire = time_second; 449110308Sorion if (la->la_asked++ < arp_maxtries) { 450110308Sorion arprequest(ifp, 451110308Sorion &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 452110308Sorion &SIN(dst)->sin_addr, 453110308Sorion IF_LLADDR(ifp)); 454110308Sorion } else { 4551541Srgrimes rt->rt_flags |= RTF_REJECT; 4561541Srgrimes rt->rt_expire += arpt_down; 457110544Sorion la->la_asked = 0; 458110544Sorion la->la_preempt = arp_maxtries; 4591541Srgrimes } 4601541Srgrimes 4611541Srgrimes } 462120727Ssam RT_UNLOCK(rt); 4631541Srgrimes } 464128636Sluigi return (EWOULDBLOCK); 4651541Srgrimes} 4661541Srgrimes 4671541Srgrimes/* 4681541Srgrimes * Common length and type checks are done here, 4691541Srgrimes * then the protocol-specific routine is called. 4701541Srgrimes */ 47112693Sphkstatic void 472111888Sjlemonarpintr(struct mbuf *m) 4731541Srgrimes{ 474111888Sjlemon struct arphdr *ar; 4751541Srgrimes 476111888Sjlemon if (m->m_len < sizeof(struct arphdr) && 477111888Sjlemon ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) { 478111888Sjlemon log(LOG_ERR, "arp: runt packet -- m_pullup failed\n"); 479111888Sjlemon return; 480111888Sjlemon } 481111888Sjlemon ar = mtod(m, struct arphdr *); 4821541Srgrimes 483111888Sjlemon if (ntohs(ar->ar_hrd) != ARPHRD_ETHER && 484111888Sjlemon ntohs(ar->ar_hrd) != ARPHRD_IEEE802 && 485130407Sdfr ntohs(ar->ar_hrd) != ARPHRD_ARCNET && 486130407Sdfr ntohs(ar->ar_hrd) != ARPHRD_IEEE1394) { 487111888Sjlemon log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n", 488111888Sjlemon (unsigned char *)&ar->ar_hrd, ""); 489111888Sjlemon m_freem(m); 490111888Sjlemon return; 491111888Sjlemon } 4921541Srgrimes 493123768Sru if (m->m_len < arphdr_len(ar)) { 494123765Sru if ((m = m_pullup(m, arphdr_len(ar))) == NULL) { 495123765Sru log(LOG_ERR, "arp: runt packet\n"); 496123765Sru m_freem(m); 497123765Sru return; 498123765Sru } 499123765Sru ar = mtod(m, struct arphdr *); 500111888Sjlemon } 50157900Srwatson 502111888Sjlemon switch (ntohs(ar->ar_pro)) { 50332350Seivind#ifdef INET 504111888Sjlemon case ETHERTYPE_IP: 505111888Sjlemon in_arpinput(m); 506111888Sjlemon return; 50732350Seivind#endif 5081541Srgrimes } 509111888Sjlemon m_freem(m); 5101541Srgrimes} 5111541Srgrimes 51232350Seivind#ifdef INET 5131541Srgrimes/* 5141541Srgrimes * ARP for Internet protocols on 10 Mb/s Ethernet. 5151541Srgrimes * Algorithm is that given in RFC 826. 5161541Srgrimes * In addition, a sanity check is performed on the sender 5171541Srgrimes * protocol address, to catch impersonators. 5181541Srgrimes * We no longer handle negotiations for use of trailer protocol: 5191541Srgrimes * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent 5201541Srgrimes * along with IP replies if we wanted trailers sent to us, 5211541Srgrimes * and also sent them in response to IP replies. 5221541Srgrimes * This allowed either end to announce the desire to receive 5231541Srgrimes * trailer packets. 5241541Srgrimes * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, 5251541Srgrimes * but formerly didn't normally send requests. 5261541Srgrimes */ 52770699Salfredstatic int log_arp_wrong_iface = 1; 52882893Salfredstatic int log_arp_movements = 1; 52970699Salfred 53070699SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW, 53170699Salfred &log_arp_wrong_iface, 0, 53270699Salfred "log arp packets arriving on the wrong interface"); 53382893SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW, 53482893Salfred &log_arp_movements, 0, 53582966Salfred "log arp replies from MACs different than the one in the cache"); 53670699Salfred 53782893Salfred 5381541Srgrimesstatic void 5391541Srgrimesin_arpinput(m) 5401541Srgrimes struct mbuf *m; 5411541Srgrimes{ 542126936Smdodd struct arphdr *ah; 543126936Smdodd struct ifnet *ifp = m->m_pkthdr.rcvif; 54444627Sjulian struct iso88025_header *th = (struct iso88025_header *)0; 54596184Skbyanc struct iso88025_sockaddr_dl_data *trld; 546126936Smdodd struct llinfo_arp *la = 0; 547126936Smdodd struct rtentry *rt; 54884102Sjlemon struct ifaddr *ifa; 54984102Sjlemon struct in_ifaddr *ia; 5501541Srgrimes struct sockaddr_dl *sdl; 5511541Srgrimes struct sockaddr sa; 5521541Srgrimes struct in_addr isaddr, itaddr, myaddr; 553142215Sglebius u_int8_t *enaddr = NULL; 55458313Slile int op, rif_len; 55584931Sfjoe int req_len; 5561541Srgrimes 55784931Sfjoe req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 55884931Sfjoe if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) { 55974851Syar log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); 56074851Syar return; 56174851Syar } 56274851Syar 56384931Sfjoe ah = mtod(m, struct arphdr *); 56484931Sfjoe op = ntohs(ah->ar_op); 56584931Sfjoe (void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr)); 56684931Sfjoe (void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr)); 567134991Sglebius 56884102Sjlemon /* 56984102Sjlemon * For a bridge, we want to check the address irrespective 57084102Sjlemon * of the receive interface. (This will change slightly 57184102Sjlemon * when we have clusters of interfaces). 572142215Sglebius * If the interface does not match, but the recieving interface 573142215Sglebius * is part of carp, we call carp_iamatch to see if this is a 574142215Sglebius * request for the virtual host ip. 575142215Sglebius * XXX: This is really ugly! 57684102Sjlemon */ 57784102Sjlemon LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) 578142215Sglebius if ((do_bridge || (ia->ia_ifp == ifp) 579142215Sglebius#ifdef DEV_CARP 580142215Sglebius || (ifp->if_carp 581142215Sglebius && carp_iamatch(ifp->if_carp, ia, &isaddr, &enaddr)) 582142215Sglebius#endif 583142215Sglebius ) && itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 58484102Sjlemon goto match; 58584102Sjlemon LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash) 586134991Sglebius if ((do_bridge || (ia->ia_ifp == ifp)) && 58784102Sjlemon isaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 58884102Sjlemon goto match; 58984102Sjlemon /* 59085223Sjlemon * No match, use the first inet address on the receive interface 59184102Sjlemon * as a dummy address for the rest of the function. 59284102Sjlemon */ 59385223Sjlemon TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 59485466Sjlemon if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 59585466Sjlemon ia = ifatoia(ifa); 59685466Sjlemon goto match; 59785466Sjlemon } 59885466Sjlemon /* 59985466Sjlemon * If bridging, fall back to using any inet address. 60085466Sjlemon */ 601134991Sglebius if (!do_bridge || (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL) 602128645Sluigi goto drop; 60384102Sjlemonmatch: 604142215Sglebius if (!enaddr) 605142215Sglebius enaddr = (u_int8_t *)IF_LLADDR(ifp); 60684102Sjlemon myaddr = ia->ia_addr.sin_addr; 607142215Sglebius if (!bcmp(ar_sha(ah), enaddr, ifp->if_addrlen)) 608128645Sluigi goto drop; /* it's from me, ignore it. */ 60984931Sfjoe if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { 6101541Srgrimes log(LOG_ERR, 61184931Sfjoe "arp: link address is broadcast for IP address %s!\n", 6127088Swollman inet_ntoa(isaddr)); 613128645Sluigi goto drop; 6141541Srgrimes } 615136441Srwatson /* 616136441Srwatson * Warn if another host is using the same IP address, but only if the 617136441Srwatson * IP address isn't 0.0.0.0, which is used for DHCP only, in which 618136441Srwatson * case we suppress the warning to avoid false positive complaints of 619136441Srwatson * potential misconfiguration. 620136441Srwatson */ 621136441Srwatson if (isaddr.s_addr == myaddr.s_addr && myaddr.s_addr != 0) { 6221541Srgrimes log(LOG_ERR, 62384931Sfjoe "arp: %*D is using my IP address %s!\n", 62484931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 62584931Sfjoe inet_ntoa(isaddr)); 6261541Srgrimes itaddr = myaddr; 6271541Srgrimes goto reply; 6281541Srgrimes } 629120626Sru if (ifp->if_flags & IFF_STATICARP) 630120626Sru goto reply; 6311541Srgrimes la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0); 6321541Srgrimes if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) { 63372270Sluigi /* the following is not an error when doing bridging */ 634134991Sglebius if (!do_bridge && rt->rt_ifp != ifp) { 63572270Sluigi if (log_arp_wrong_iface) 636121816Sbrooks log(LOG_ERR, "arp: %s is on %s but got reply from %*D on %s\n", 63771963Sjulian inet_ntoa(isaddr), 638121816Sbrooks rt->rt_ifp->if_xname, 63984931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 640121816Sbrooks ifp->if_xname); 64172270Sluigi goto reply; 64239389Sfenner } 6431541Srgrimes if (sdl->sdl_alen && 64484931Sfjoe bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) { 64582893Salfred if (rt->rt_expire) { 64682893Salfred if (log_arp_movements) 647121816Sbrooks log(LOG_INFO, "arp: %s moved from %*D to %*D on %s\n", 64884931Sfjoe inet_ntoa(isaddr), 64984931Sfjoe ifp->if_addrlen, (u_char *)LLADDR(sdl), ":", 65084931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 651121816Sbrooks ifp->if_xname); 65282893Salfred } else { 65339389Sfenner log(LOG_ERR, 654121816Sbrooks "arp: %*D attempts to modify permanent entry for %s on %s\n", 65584931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 656121816Sbrooks inet_ntoa(isaddr), ifp->if_xname); 65739389Sfenner goto reply; 65839389Sfenner } 65946568Speter } 66084931Sfjoe /* 66184931Sfjoe * sanity check for the address length. 66284931Sfjoe * XXX this does not work for protocols with variable address 66384931Sfjoe * length. -is 66484931Sfjoe */ 66584931Sfjoe if (sdl->sdl_alen && 66684931Sfjoe sdl->sdl_alen != ah->ar_hln) { 66784931Sfjoe log(LOG_WARNING, 66884931Sfjoe "arp from %*D: new addr len %d, was %d", 66984931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 67084931Sfjoe ah->ar_hln, sdl->sdl_alen); 67184931Sfjoe } 67284931Sfjoe if (ifp->if_addrlen != ah->ar_hln) { 67384931Sfjoe log(LOG_WARNING, 67484931Sfjoe "arp from %*D: addr len: new %d, i/f %d (ignored)", 67584931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 67684931Sfjoe ah->ar_hln, ifp->if_addrlen); 67784931Sfjoe goto reply; 67884931Sfjoe } 67984931Sfjoe (void)memcpy(LLADDR(sdl), ar_sha(ah), 68084931Sfjoe sdl->sdl_alen = ah->ar_hln); 68145705Seivind /* 68245705Seivind * If we receive an arp from a token-ring station over 68345705Seivind * a token-ring nic then try to save the source 68445705Seivind * routing info. 68545705Seivind */ 68684931Sfjoe if (ifp->if_type == IFT_ISO88025) { 68744627Sjulian th = (struct iso88025_header *)m->m_pkthdr.header; 68896184Skbyanc trld = SDL_ISO88025(sdl); 68958313Slile rif_len = TR_RCF_RIFLEN(th->rcf); 69058313Slile if ((th->iso88025_shost[0] & TR_RII) && 69158313Slile (rif_len > 2)) { 69296184Skbyanc trld->trld_rcf = th->rcf; 69396184Skbyanc trld->trld_rcf ^= htons(TR_RCF_DIR); 69496184Skbyanc memcpy(trld->trld_route, th->rd, rif_len - 2); 69596184Skbyanc trld->trld_rcf &= ~htons(TR_RCF_BCST_MASK); 69651320Slile /* 69751320Slile * Set up source routing information for 69851320Slile * reply packet (XXX) 69951320Slile */ 70058313Slile m->m_data -= rif_len; 70158313Slile m->m_len += rif_len; 70258313Slile m->m_pkthdr.len += rif_len; 70344627Sjulian } else { 70458313Slile th->iso88025_shost[0] &= ~TR_RII; 70596624Skbyanc trld->trld_rcf = 0; 70644627Sjulian } 70750512Slile m->m_data -= 8; 70850512Slile m->m_len += 8; 70950512Slile m->m_pkthdr.len += 8; 71096184Skbyanc th->rcf = trld->trld_rcf; 71144627Sjulian } 712120727Ssam RT_LOCK(rt); 7131541Srgrimes if (rt->rt_expire) 71434961Sphk rt->rt_expire = time_second + arpt_keep; 7151541Srgrimes rt->rt_flags &= ~RTF_REJECT; 716120727Ssam RT_UNLOCK(rt); 717110544Sorion la->la_asked = 0; 718110544Sorion la->la_preempt = arp_maxtries; 7191541Srgrimes if (la->la_hold) { 720127277Smdodd (*ifp->if_output)(ifp, la->la_hold, rt_key(rt), rt); 7211541Srgrimes la->la_hold = 0; 7221541Srgrimes } 7231541Srgrimes } 7241541Srgrimesreply: 725128645Sluigi if (op != ARPOP_REQUEST) 726128645Sluigi goto drop; 7271541Srgrimes if (itaddr.s_addr == myaddr.s_addr) { 7281541Srgrimes /* I am the target */ 72984931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 730142215Sglebius (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln); 7311541Srgrimes } else { 7321541Srgrimes la = arplookup(itaddr.s_addr, 0, SIN_PROXY); 7333282Swollman if (la == NULL) { 7343282Swollman struct sockaddr_in sin; 7353282Swollman 736128645Sluigi if (!arp_proxyall) 737128645Sluigi goto drop; 7383282Swollman 7393282Swollman bzero(&sin, sizeof sin); 7403282Swollman sin.sin_family = AF_INET; 7413282Swollman sin.sin_len = sizeof sin; 7423282Swollman sin.sin_addr = itaddr; 7433282Swollman 7445101Swollman rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 745128645Sluigi if (!rt) 746128645Sluigi goto drop; 7473282Swollman /* 7483282Swollman * Don't send proxies for nodes on the same interface 7493282Swollman * as this one came out of, or we'll get into a fight 7503282Swollman * over who claims what Ether address. 7513282Swollman */ 75284931Sfjoe if (rt->rt_ifp == ifp) { 7533282Swollman rtfree(rt); 754128645Sluigi goto drop; 7553282Swollman } 75684931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 757142215Sglebius (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln); 7583282Swollman rtfree(rt); 75963080Sdwmalone 76063080Sdwmalone /* 76163080Sdwmalone * Also check that the node which sent the ARP packet 76263080Sdwmalone * is on the the interface we expect it to be on. This 76363080Sdwmalone * avoids ARP chaos if an interface is connected to the 76463080Sdwmalone * wrong network. 76563080Sdwmalone */ 76663080Sdwmalone sin.sin_addr = isaddr; 76763080Sdwmalone 76863080Sdwmalone rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 769128645Sluigi if (!rt) 770128645Sluigi goto drop; 77184931Sfjoe if (rt->rt_ifp != ifp) { 77263080Sdwmalone log(LOG_INFO, "arp_proxy: ignoring request" 773121816Sbrooks " from %s via %s, expecting %s\n", 774121816Sbrooks inet_ntoa(isaddr), ifp->if_xname, 775121816Sbrooks rt->rt_ifp->if_xname); 77663080Sdwmalone rtfree(rt); 777128645Sluigi goto drop; 77863080Sdwmalone } 77963080Sdwmalone rtfree(rt); 78063080Sdwmalone 7814069Swollman#ifdef DEBUG_PROXY 7828876Srgrimes printf("arp: proxying for %s\n", 7837088Swollman inet_ntoa(itaddr)); 7844069Swollman#endif 7853282Swollman } else { 7863282Swollman rt = la->la_rt; 78784931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 7883282Swollman sdl = SDL(rt->rt_gateway); 78984931Sfjoe (void)memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln); 7903282Swollman } 7911541Srgrimes } 7921541Srgrimes 79384931Sfjoe (void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); 79484931Sfjoe (void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln); 79584931Sfjoe ah->ar_op = htons(ARPOP_REPLY); 79684931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ 797127261Smdodd m->m_flags &= ~(M_BCAST|M_MCAST); /* never reply by broadcast */ 798127261Smdodd m->m_len = sizeof(*ah) + (2 * ah->ar_pln) + (2 * ah->ar_hln); 799127261Smdodd m->m_pkthdr.len = m->m_len; 800127261Smdodd sa.sa_family = AF_ARP; 801127261Smdodd sa.sa_len = 2; 80284931Sfjoe (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 8031541Srgrimes return; 804128645Sluigi 805128645Sluigidrop: 806128645Sluigi m_freem(m); 8071541Srgrimes} 80832350Seivind#endif 8091541Srgrimes 8101541Srgrimes/* 8111541Srgrimes * Free an arp entry. 8121541Srgrimes */ 8131541Srgrimesstatic void 8141541Srgrimesarptfree(la) 815126936Smdodd struct llinfo_arp *la; 8161541Srgrimes{ 817126936Smdodd struct rtentry *rt = la->la_rt; 818126936Smdodd struct sockaddr_dl *sdl; 819120727Ssam 8201541Srgrimes if (rt == 0) 8211541Srgrimes panic("arptfree"); 8221541Srgrimes if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) && 8231541Srgrimes sdl->sdl_family == AF_LINK) { 8241541Srgrimes sdl->sdl_alen = 0; 825110308Sorion la->la_preempt = la->la_asked = 0; 826120727Ssam RT_LOCK(rt); /* XXX needed or move higher? */ 8271541Srgrimes rt->rt_flags &= ~RTF_REJECT; 828120727Ssam RT_UNLOCK(rt); 8291541Srgrimes return; 8301541Srgrimes } 8311541Srgrimes rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt), 8321541Srgrimes 0, (struct rtentry **)0); 8331541Srgrimes} 8341541Srgrimes/* 8351541Srgrimes * Lookup or enter a new address in arptab. 8361541Srgrimes */ 8371541Srgrimesstatic struct llinfo_arp * 8381541Srgrimesarplookup(addr, create, proxy) 8391541Srgrimes u_long addr; 8401541Srgrimes int create, proxy; 8411541Srgrimes{ 842126936Smdodd struct rtentry *rt; 843120727Ssam struct sockaddr_inarp sin; 8444069Swollman const char *why = 0; 8451541Srgrimes 846120727Ssam bzero(&sin, sizeof(sin)); 847120727Ssam sin.sin_len = sizeof(sin); 848120727Ssam sin.sin_family = AF_INET; 8491541Srgrimes sin.sin_addr.s_addr = addr; 850120727Ssam if (proxy) 851120727Ssam sin.sin_other = SIN_PROXY; 8525101Swollman rt = rtalloc1((struct sockaddr *)&sin, create, 0UL); 8531541Srgrimes if (rt == 0) 8541541Srgrimes return (0); 8554069Swollman 85612693Sphk if (rt->rt_flags & RTF_GATEWAY) 8574069Swollman why = "host is not on local network"; 85812693Sphk else if ((rt->rt_flags & RTF_LLINFO) == 0) 8594069Swollman why = "could not allocate llinfo"; 86012693Sphk else if (rt->rt_gateway->sa_family != AF_LINK) 8614069Swollman why = "gateway route is not ours"; 8624069Swollman 863120383Sbms if (why) { 864120727Ssam#define ISDYNCLONE(_rt) \ 865120727Ssam (((_rt)->rt_flags & (RTF_STATIC | RTF_WASCLONED)) == RTF_WASCLONED) 866120727Ssam if (create) 867120383Sbms log(LOG_DEBUG, "arplookup %s failed: %s\n", 868120383Sbms inet_ntoa(sin.sin_addr), why); 869120727Ssam /* 870120727Ssam * If there are no references to this Layer 2 route, 871120727Ssam * and it is a cloned route, and not static, and 872120727Ssam * arplookup() is creating the route, then purge 873120727Ssam * it from the routing table as it is probably bogus. 874120727Ssam */ 875121770Ssam if (rt->rt_refcnt == 1 && ISDYNCLONE(rt)) 876121770Ssam rtexpunge(rt); 877121770Ssam RTFREE_LOCKED(rt); 878120383Sbms return (0); 879120727Ssam#undef ISDYNCLONE 880120727Ssam } else { 881122334Ssam RT_REMREF(rt); 882120727Ssam RT_UNLOCK(rt); 883120727Ssam return ((struct llinfo_arp *)rt->rt_llinfo); 8841541Srgrimes } 8851541Srgrimes} 8861541Srgrimes 8875195Swollmanvoid 88884931Sfjoearp_ifinit(ifp, ifa) 88984931Sfjoe struct ifnet *ifp; 8905195Swollman struct ifaddr *ifa; 8915195Swollman{ 89225822Stegge if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) 89384931Sfjoe arprequest(ifp, &IA_SIN(ifa)->sin_addr, 89484931Sfjoe &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp)); 8955195Swollman ifa->ifa_rtrequest = arp_rtrequest; 8965195Swollman ifa->ifa_flags |= RTF_CLONING; 8975195Swollman} 89869152Sjlemon 899142215Sglebiusvoid 900142215Sglebiusarp_ifinit2(ifp, ifa, enaddr) 901142215Sglebius struct ifnet *ifp; 902142215Sglebius struct ifaddr *ifa; 903142215Sglebius u_char *enaddr; 904142215Sglebius{ 905142215Sglebius if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) 906142215Sglebius arprequest(ifp, &IA_SIN(ifa)->sin_addr, 907142215Sglebius &IA_SIN(ifa)->sin_addr, enaddr); 908142215Sglebius ifa->ifa_rtrequest = arp_rtrequest; 909142215Sglebius ifa->ifa_flags |= RTF_CLONING; 910142215Sglebius} 911142215Sglebius 91269152Sjlemonstatic void 91369152Sjlemonarp_init(void) 91469152Sjlemon{ 91569152Sjlemon 91669152Sjlemon arpintrq.ifq_maxlen = 50; 91793818Sjhb mtx_init(&arpintrq.ifq_mtx, "arp_inq", NULL, MTX_DEF); 91898459Speter LIST_INIT(&llinfo_arp); 919120727Ssam callout_init(&arp_callout, CALLOUT_MPSAFE); 920122320Ssam netisr_register(NETISR_ARP, arpintr, &arpintrq, NETISR_MPSAFE); 921128641Sluigi callout_reset(&arp_callout, hz, arptimer, NULL); 92269152Sjlemon} 92369152SjlemonSYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0); 924