if_ether.c revision 92723
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 * 3. All advertising materials mentioning features or use of this software 141541Srgrimes * must display the following acknowledgement: 151541Srgrimes * This product includes software developed by the University of 161541Srgrimes * California, Berkeley and its contributors. 171541Srgrimes * 4. Neither the name of the University nor the names of its contributors 181541Srgrimes * may be used to endorse or promote products derived from this software 191541Srgrimes * without specific prior written permission. 201541Srgrimes * 211541Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 221541Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 231541Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 241541Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 251541Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 261541Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 271541Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 281541Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 291541Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 301541Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 311541Srgrimes * SUCH DAMAGE. 321541Srgrimes * 331541Srgrimes * @(#)if_ether.c 8.1 (Berkeley) 6/10/93 3450477Speter * $FreeBSD: head/sys/netinet/if_ether.c 92723 2002-03-19 21:25:46Z alfred $ 351541Srgrimes */ 361541Srgrimes 371541Srgrimes/* 381541Srgrimes * Ethernet address resolution protocol. 391541Srgrimes * TODO: 401541Srgrimes * add "inuse/lock" bit (or ref. count) along with valid bit 411541Srgrimes */ 421541Srgrimes 4332350Seivind#include "opt_inet.h" 4441793Sluigi#include "opt_bdg.h" 4532350Seivind 461541Srgrimes#include <sys/param.h> 4712693Sphk#include <sys/kernel.h> 4844078Sdfr#include <sys/queue.h> 4912693Sphk#include <sys/sysctl.h> 501541Srgrimes#include <sys/systm.h> 5112693Sphk#include <sys/mbuf.h> 521541Srgrimes#include <sys/malloc.h> 5318892Sbde#include <sys/socket.h> 541541Srgrimes#include <sys/syslog.h> 551541Srgrimes 561541Srgrimes#include <net/if.h> 571541Srgrimes#include <net/if_dl.h> 5844165Sjulian#include <net/if_types.h> 591541Srgrimes#include <net/route.h> 608426Swollman#include <net/netisr.h> 6158313Slile#include <net/if_llc.h> 6271963Sjulian#ifdef BRIDGE 6371963Sjulian#include <net/ethernet.h> 6471963Sjulian#include <net/bridge.h> 6571963Sjulian#endif 661541Srgrimes 671541Srgrimes#include <netinet/in.h> 681541Srgrimes#include <netinet/in_var.h> 691541Srgrimes#include <netinet/if_ether.h> 701541Srgrimes 7184931Sfjoe#include <net/if_arc.h> 7244627Sjulian#include <net/iso88025.h> 7344627Sjulian 741541Srgrimes#define SIN(s) ((struct sockaddr_in *)s) 751541Srgrimes#define SDL(s) ((struct sockaddr_dl *)s) 761541Srgrimes 7744078SdfrSYSCTL_DECL(_net_link_ether); 7812942SwollmanSYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, ""); 791541Srgrimes 8012693Sphk/* timer values */ 8112942Swollmanstatic int arpt_prune = (5*60*1); /* walk list every 5 minutes */ 8212942Swollmanstatic int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ 8312942Swollmanstatic int arpt_down = 20; /* once declared down, don't send for 20 sec */ 841541Srgrimes 8512942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW, 8612942Swollman &arpt_prune, 0, ""); 8712942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW, 8812942Swollman &arpt_keep, 0, ""); 8912942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW, 9012942Swollman &arpt_down, 0, ""); 9112693Sphk 921541Srgrimes#define rt_expire rt_rmx.rmx_expire 931541Srgrimes 9411225Swollmanstruct llinfo_arp { 9560938Sjake LIST_ENTRY(llinfo_arp) la_le; 9611225Swollman struct rtentry *la_rt; 9711225Swollman struct mbuf *la_hold; /* last packet until resolved/timeout */ 9811225Swollman long la_asked; /* last time we QUERIED for this addr */ 9911225Swollman#define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 10011225Swollman}; 10112693Sphk 10260938Sjakestatic LIST_HEAD(, llinfo_arp) llinfo_arp; 10311225Swollman 10469152Sjlemonstruct ifqueue arpintrq; 10512820Sphkstatic int arp_inuse, arp_allocated; 1061541Srgrimes 10712693Sphkstatic int arp_maxtries = 5; 10812942Swollmanstatic int useloopback = 1; /* use loopback interface for local traffic */ 10912942Swollmanstatic int arp_proxyall = 0; 1103282Swollman 11112942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW, 11212942Swollman &arp_maxtries, 0, ""); 11312942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW, 11412942Swollman &useloopback, 0, ""); 11512942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW, 11612942Swollman &arp_proxyall, 0, ""); 11712693Sphk 11892723Salfredstatic void arp_init(void); 11992723Salfredstatic void arp_rtrequest(int, struct rtentry *, struct rt_addrinfo *); 12092723Salfredstatic void arprequest(struct ifnet *, 12192723Salfred struct in_addr *, struct in_addr *, u_char *); 12292723Salfredstatic void arpintr(void); 12392723Salfredstatic void arptfree(struct llinfo_arp *); 12492723Salfredstatic void arptimer(void *); 12512693Sphkstatic struct llinfo_arp 12692723Salfred *arplookup(u_long, int, int); 12732350Seivind#ifdef INET 12892723Salfredstatic void in_arpinput(struct mbuf *); 12932350Seivind#endif 13012693Sphk 1311541Srgrimes/* 1321541Srgrimes * Timeout routine. Age arp_tab entries periodically. 1331541Srgrimes */ 1341541Srgrimes/* ARGSUSED */ 1351541Srgrimesstatic void 1361541Srgrimesarptimer(ignored_arg) 1371541Srgrimes void *ignored_arg; 1381541Srgrimes{ 1391541Srgrimes int s = splnet(); 14071999Sphk register struct llinfo_arp *la = LIST_FIRST(&llinfo_arp); 14111225Swollman struct llinfo_arp *ola; 1421541Srgrimes 1431541Srgrimes timeout(arptimer, (caddr_t)0, arpt_prune * hz); 14411225Swollman while ((ola = la) != 0) { 1451541Srgrimes register struct rtentry *rt = la->la_rt; 14671999Sphk la = LIST_NEXT(la, la_le); 14734961Sphk if (rt->rt_expire && rt->rt_expire <= time_second) 14811225Swollman arptfree(ola); /* timer has expired, clear */ 1491541Srgrimes } 1501541Srgrimes splx(s); 1511541Srgrimes} 1521541Srgrimes 1531541Srgrimes/* 1541541Srgrimes * Parallel to llc_rtrequest. 1551541Srgrimes */ 1565196Swollmanstatic void 15785074Sruarp_rtrequest(req, rt, info) 1581541Srgrimes int req; 1591541Srgrimes register struct rtentry *rt; 16085074Sru struct rt_addrinfo *info; 1611541Srgrimes{ 1621541Srgrimes register struct sockaddr *gate = rt->rt_gateway; 1631541Srgrimes register struct llinfo_arp *la = (struct llinfo_arp *)rt->rt_llinfo; 1641541Srgrimes static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 16512693Sphk static int arpinit_done; 1661541Srgrimes 1671541Srgrimes if (!arpinit_done) { 1681541Srgrimes arpinit_done = 1; 16911225Swollman LIST_INIT(&llinfo_arp); 1701541Srgrimes timeout(arptimer, (caddr_t)0, hz); 17157178Speter register_netisr(NETISR_ARP, arpintr); 1721541Srgrimes } 1731541Srgrimes if (rt->rt_flags & RTF_GATEWAY) 1741541Srgrimes return; 1751541Srgrimes switch (req) { 1761541Srgrimes 1771541Srgrimes case RTM_ADD: 1781541Srgrimes /* 1791541Srgrimes * XXX: If this is a manually added route to interface 1801541Srgrimes * such as older version of routed or gated might provide, 1811541Srgrimes * restore cloning bit. 1821541Srgrimes */ 1831541Srgrimes if ((rt->rt_flags & RTF_HOST) == 0 && 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)) { 2086568Sdg log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n"); 2091541Srgrimes break; 2101541Srgrimes } 2111541Srgrimes SDL(gate)->sdl_type = rt->rt_ifp->if_type; 2121541Srgrimes SDL(gate)->sdl_index = rt->rt_ifp->if_index; 2131541Srgrimes if (la != 0) 2141541Srgrimes break; /* This happens on a route change */ 2151541Srgrimes /* 2161541Srgrimes * Case 2: This route may come from cloning, or a manual route 2171541Srgrimes * add with a LL address. 2181541Srgrimes */ 2191541Srgrimes R_Malloc(la, struct llinfo_arp *, sizeof(*la)); 2201541Srgrimes rt->rt_llinfo = (caddr_t)la; 2211541Srgrimes if (la == 0) { 2221541Srgrimes log(LOG_DEBUG, "arp_rtrequest: malloc failed\n"); 2231541Srgrimes break; 2241541Srgrimes } 2251541Srgrimes arp_inuse++, arp_allocated++; 2261541Srgrimes Bzero(la, sizeof(*la)); 2271541Srgrimes la->la_rt = rt; 2281541Srgrimes rt->rt_flags |= RTF_LLINFO; 22911225Swollman LIST_INSERT_HEAD(&llinfo_arp, la, la_le); 23013926Swollman 23132350Seivind#ifdef INET 23213926Swollman /* 23313926Swollman * This keeps the multicast addresses from showing up 23413926Swollman * in `arp -a' listings as unresolved. It's not actually 23513926Swollman * functional. Then the same for broadcast. 23613926Swollman */ 23787776Sjlemon if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr)) && 23887776Sjlemon rt->rt_ifp->if_type != IFT_ARCNET) { 23913926Swollman ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr, 24013926Swollman LLADDR(SDL(gate))); 24113926Swollman SDL(gate)->sdl_alen = 6; 24216576Speter rt->rt_expire = 0; 24313926Swollman } 24413926Swollman if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) { 24584931Sfjoe memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr, 24684931Sfjoe rt->rt_ifp->if_addrlen); 24784931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen; 24816576Speter rt->rt_expire = 0; 24913926Swollman } 25032350Seivind#endif 25113926Swollman 2521541Srgrimes if (SIN(rt_key(rt))->sin_addr.s_addr == 2531541Srgrimes (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) { 2541541Srgrimes /* 2551541Srgrimes * This test used to be 2561541Srgrimes * if (loif.if_flags & IFF_UP) 2571541Srgrimes * It allowed local traffic to be forced 2581541Srgrimes * through the hardware by configuring the loopback down. 2591541Srgrimes * However, it causes problems during network configuration 2601541Srgrimes * for boards that can't receive packets they send. 2611541Srgrimes * It is now necessary to clear "useloopback" and remove 2621541Srgrimes * the route to force traffic out to the hardware. 2631541Srgrimes */ 2641541Srgrimes rt->rt_expire = 0; 26584931Sfjoe Bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)), 26684931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen); 2671541Srgrimes if (useloopback) 2688090Spst rt->rt_ifp = loif; 2691541Srgrimes 2701541Srgrimes } 2711541Srgrimes break; 2721541Srgrimes 2731541Srgrimes case RTM_DELETE: 2741541Srgrimes if (la == 0) 2751541Srgrimes break; 2761541Srgrimes arp_inuse--; 27711225Swollman LIST_REMOVE(la, la_le); 2781541Srgrimes rt->rt_llinfo = 0; 2791541Srgrimes rt->rt_flags &= ~RTF_LLINFO; 2801541Srgrimes if (la->la_hold) 2811541Srgrimes m_freem(la->la_hold); 2821541Srgrimes Free((caddr_t)la); 2831541Srgrimes } 2841541Srgrimes} 2851541Srgrimes 2861541Srgrimes/* 2871541Srgrimes * Broadcast an ARP request. Caller specifies: 2881541Srgrimes * - arp header source ip address 2891541Srgrimes * - arp header target ip address 2901541Srgrimes * - arp header source ethernet address 2911541Srgrimes */ 2921541Srgrimesstatic void 29384931Sfjoearprequest(ifp, sip, tip, enaddr) 29484931Sfjoe register struct ifnet *ifp; 29536908Sjulian register struct in_addr *sip, *tip; 2961541Srgrimes register u_char *enaddr; 2971541Srgrimes{ 2981541Srgrimes register struct mbuf *m; 2991541Srgrimes register struct ether_header *eh; 30084931Sfjoe register struct arc_header *arh; 30184931Sfjoe register struct arphdr *ah; 3021541Srgrimes struct sockaddr sa; 30358313Slile static u_char llcx[] = { 0x82, 0x40, LLC_SNAP_LSAP, LLC_SNAP_LSAP, 30458313Slile LLC_UI, 0x00, 0x00, 0x00, 0x08, 0x06 }; 30584931Sfjoe u_short ar_hrd; 3061541Srgrimes 3071541Srgrimes if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) 3081541Srgrimes return; 30944456Swpaul m->m_pkthdr.rcvif = (struct ifnet *)0; 31084931Sfjoe switch (ifp->if_type) { 31184931Sfjoe case IFT_ARCNET: 31284931Sfjoe ar_hrd = htons(ARPHRD_ARCNET); 31384931Sfjoe 31484931Sfjoe m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 31584931Sfjoe m->m_pkthdr.len = m->m_len; 31684931Sfjoe MH_ALIGN(m, m->m_len); 31784931Sfjoe 31884931Sfjoe arh = (struct arc_header *)sa.sa_data; 31984931Sfjoe arh->arc_dhost = *ifp->if_broadcastaddr; 32084931Sfjoe arh->arc_type = ARCTYPE_ARP; 32184931Sfjoe 32284931Sfjoe ah = mtod(m, struct arphdr *); 32384931Sfjoe break; 32484931Sfjoe 32544627Sjulian case IFT_ISO88025: 32684931Sfjoe ar_hrd = htons(ARPHRD_IEEE802); 32784931Sfjoe 32884931Sfjoe m->m_len = sizeof(llcx) + 32984931Sfjoe arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 33084931Sfjoe m->m_pkthdr.len = m->m_len; 33184931Sfjoe MH_ALIGN(m, m->m_len); 33284931Sfjoe 33358313Slile (void)memcpy(mtod(m, caddr_t), llcx, sizeof(llcx)); 33484931Sfjoe (void)memcpy(sa.sa_data, ifp->if_broadcastaddr, 6); 33544627Sjulian (void)memcpy(sa.sa_data + 6, enaddr, 6); 33658313Slile sa.sa_data[6] |= TR_RII; 33758313Slile sa.sa_data[12] = TR_AC; 33858313Slile sa.sa_data[13] = TR_LLC_FRAME; 33984931Sfjoe 34084931Sfjoe ah = (struct arphdr *)(mtod(m, char *) + sizeof(llcx)); 34144627Sjulian break; 34251320Slile case IFT_FDDI: 34351320Slile case IFT_ETHER: 34451320Slile /* 34551320Slile * This may not be correct for types not explicitly 34651320Slile * listed, but this is our best guess 34751320Slile */ 34844627Sjulian default: 34984931Sfjoe ar_hrd = htons(ARPHRD_ETHER); 35084931Sfjoe 35184931Sfjoe m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 35284931Sfjoe m->m_pkthdr.len = m->m_len; 35384931Sfjoe MH_ALIGN(m, m->m_len); 35484931Sfjoe 35551320Slile eh = (struct ether_header *)sa.sa_data; 35651320Slile /* if_output will not swap */ 35751320Slile eh->ether_type = htons(ETHERTYPE_ARP); 35884931Sfjoe (void)memcpy(eh->ether_dhost, ifp->if_broadcastaddr, 35951320Slile sizeof(eh->ether_dhost)); 36084931Sfjoe 36184931Sfjoe ah = mtod(m, struct arphdr *); 36251320Slile break; 36344627Sjulian } 36484931Sfjoe 36584931Sfjoe ah->ar_hrd = ar_hrd; 36684931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); 36784931Sfjoe ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 36884931Sfjoe ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 36984931Sfjoe ah->ar_op = htons(ARPOP_REQUEST); 37084931Sfjoe (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln); 37184931Sfjoe (void)memcpy(ar_spa(ah), sip, ah->ar_pln); 37284931Sfjoe (void)memcpy(ar_tpa(ah), tip, ah->ar_pln); 37384931Sfjoe 3741541Srgrimes sa.sa_family = AF_UNSPEC; 3751541Srgrimes sa.sa_len = sizeof(sa); 37684931Sfjoe (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 3771541Srgrimes} 3781541Srgrimes 3791541Srgrimes/* 3801541Srgrimes * Resolve an IP address into an ethernet address. If success, 3811541Srgrimes * desten is filled in. If there is no entry in arptab, 3821541Srgrimes * set one up and broadcast a request for the IP address. 3831541Srgrimes * Hold onto this mbuf and resend it once the address 3841541Srgrimes * is finally resolved. A return value of 1 indicates 3851541Srgrimes * that desten has been filled in and the packet should be sent 3861541Srgrimes * normally; a 0 return indicates that the packet has been 3871541Srgrimes * taken over here, either now or for later transmission. 3881541Srgrimes */ 3891541Srgrimesint 39084931Sfjoearpresolve(ifp, rt, m, dst, desten, rt0) 39184931Sfjoe register struct ifnet *ifp; 3921541Srgrimes register struct rtentry *rt; 3931541Srgrimes struct mbuf *m; 3941541Srgrimes register struct sockaddr *dst; 3951541Srgrimes register u_char *desten; 3963514Swollman struct rtentry *rt0; 3971541Srgrimes{ 39878295Sjlemon struct llinfo_arp *la = 0; 3991541Srgrimes struct sockaddr_dl *sdl; 4001541Srgrimes 4011541Srgrimes if (m->m_flags & M_BCAST) { /* broadcast */ 40284931Sfjoe (void)memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen); 4031541Srgrimes return (1); 4041541Srgrimes } 40584931Sfjoe if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {/* multicast */ 4061541Srgrimes ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten); 4071541Srgrimes return(1); 4081541Srgrimes } 4091541Srgrimes if (rt) 4101541Srgrimes la = (struct llinfo_arp *)rt->rt_llinfo; 41142775Sfenner if (la == 0) { 4123311Sphk la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0); 4133311Sphk if (la) 4141541Srgrimes rt = la->la_rt; 4151541Srgrimes } 4161541Srgrimes if (la == 0 || rt == 0) { 41736308Sphk log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n", 41836308Sphk inet_ntoa(SIN(dst)->sin_addr), la ? "la" : "", 41936308Sphk rt ? "rt" : ""); 4201541Srgrimes m_freem(m); 4211541Srgrimes return (0); 4221541Srgrimes } 4231541Srgrimes sdl = SDL(rt->rt_gateway); 4241541Srgrimes /* 4251541Srgrimes * Check the address family and length is valid, the address 4261541Srgrimes * is resolved; otherwise, try to resolve. 4271541Srgrimes */ 42834961Sphk if ((rt->rt_expire == 0 || rt->rt_expire > time_second) && 4291541Srgrimes sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) { 43016206Sbde bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 4311541Srgrimes return 1; 4321541Srgrimes } 4331541Srgrimes /* 43478295Sjlemon * If ARP is disabled on this interface, stop. 43578295Sjlemon * XXX 43678295Sjlemon * Probably should not allocate empty llinfo struct if we are 43778295Sjlemon * not going to be sending out an arp request. 43878295Sjlemon */ 43987410Sru if (ifp->if_flags & IFF_NOARP) { 44087410Sru m_freem(m); 44178295Sjlemon return (0); 44287410Sru } 44378295Sjlemon /* 4441541Srgrimes * There is an arptab entry, but no ethernet address 4451541Srgrimes * response yet. Replace the held mbuf with this 4461541Srgrimes * latest one. 4471541Srgrimes */ 4481541Srgrimes if (la->la_hold) 4491541Srgrimes m_freem(la->la_hold); 4501541Srgrimes la->la_hold = m; 4511541Srgrimes if (rt->rt_expire) { 4521541Srgrimes rt->rt_flags &= ~RTF_REJECT; 45334961Sphk if (la->la_asked == 0 || rt->rt_expire != time_second) { 45434961Sphk rt->rt_expire = time_second; 4551541Srgrimes if (la->la_asked++ < arp_maxtries) 45684931Sfjoe arprequest(ifp, 45736908Sjulian &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 45884931Sfjoe &SIN(dst)->sin_addr, 45984931Sfjoe IF_LLADDR(ifp)); 4601541Srgrimes else { 4611541Srgrimes rt->rt_flags |= RTF_REJECT; 4621541Srgrimes rt->rt_expire += arpt_down; 4631541Srgrimes la->la_asked = 0; 4641541Srgrimes } 4651541Srgrimes 4661541Srgrimes } 4671541Srgrimes } 4681541Srgrimes return (0); 4691541Srgrimes} 4701541Srgrimes 4711541Srgrimes/* 4721541Srgrimes * Common length and type checks are done here, 4731541Srgrimes * then the protocol-specific routine is called. 4741541Srgrimes */ 47512693Sphkstatic void 47631884Sbdearpintr() 4771541Srgrimes{ 47859143Swes register struct mbuf *m; 4791541Srgrimes register struct arphdr *ar; 48059143Swes int s; 4811541Srgrimes 4821541Srgrimes while (arpintrq.ifq_head) { 4831541Srgrimes s = splimp(); 4841541Srgrimes IF_DEQUEUE(&arpintrq, m); 4851541Srgrimes splx(s); 4861541Srgrimes if (m == 0 || (m->m_flags & M_PKTHDR) == 0) 4871541Srgrimes panic("arpintr"); 48857900Srwatson 48957900Srwatson if (m->m_len < sizeof(struct arphdr) && 49058499Sdillon ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) { 49158758Sjoerg log(LOG_ERR, "arp: runt packet -- m_pullup failed\n"); 49257900Srwatson continue; 49357900Srwatson } 49457900Srwatson ar = mtod(m, struct arphdr *); 4951541Srgrimes 49657900Srwatson if (ntohs(ar->ar_hrd) != ARPHRD_ETHER 49784931Sfjoe && ntohs(ar->ar_hrd) != ARPHRD_IEEE802 49884931Sfjoe && ntohs(ar->ar_hrd) != ARPHRD_ARCNET) { 49957900Srwatson log(LOG_ERR, 50058758Sjoerg "arp: unknown hardware address format (0x%2D)\n", 50157900Srwatson (unsigned char *)&ar->ar_hrd, ""); 50257900Srwatson m_freem(m); 50357900Srwatson continue; 50457900Srwatson } 5051541Srgrimes 50684931Sfjoe if (m->m_pkthdr.len < arphdr_len(ar) && 50784931Sfjoe (m = m_pullup(m, arphdr_len(ar))) == NULL) { 50858770Sjoerg log(LOG_ERR, "arp: runt packet\n"); 50957900Srwatson m_freem(m); 51057900Srwatson continue; 51157900Srwatson } 51257900Srwatson 51357900Srwatson switch (ntohs(ar->ar_pro)) { 51432350Seivind#ifdef INET 51557900Srwatson case ETHERTYPE_IP: 51657900Srwatson in_arpinput(m); 51757900Srwatson continue; 51832350Seivind#endif 51957900Srwatson } 5201541Srgrimes m_freem(m); 5211541Srgrimes } 5221541Srgrimes} 5231541Srgrimes 52432350Seivind#ifdef INET 5251541Srgrimes/* 5261541Srgrimes * ARP for Internet protocols on 10 Mb/s Ethernet. 5271541Srgrimes * Algorithm is that given in RFC 826. 5281541Srgrimes * In addition, a sanity check is performed on the sender 5291541Srgrimes * protocol address, to catch impersonators. 5301541Srgrimes * We no longer handle negotiations for use of trailer protocol: 5311541Srgrimes * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent 5321541Srgrimes * along with IP replies if we wanted trailers sent to us, 5331541Srgrimes * and also sent them in response to IP replies. 5341541Srgrimes * This allowed either end to announce the desire to receive 5351541Srgrimes * trailer packets. 5361541Srgrimes * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, 5371541Srgrimes * but formerly didn't normally send requests. 5381541Srgrimes */ 53970699Salfredstatic int log_arp_wrong_iface = 1; 54082893Salfredstatic int log_arp_movements = 1; 54170699Salfred 54270699SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW, 54370699Salfred &log_arp_wrong_iface, 0, 54470699Salfred "log arp packets arriving on the wrong interface"); 54582893SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW, 54682893Salfred &log_arp_movements, 0, 54782966Salfred "log arp replies from MACs different than the one in the cache"); 54870699Salfred 54982893Salfred 5501541Srgrimesstatic void 5511541Srgrimesin_arpinput(m) 5521541Srgrimes struct mbuf *m; 5531541Srgrimes{ 55484931Sfjoe register struct arphdr *ah; 55584931Sfjoe register struct ifnet *ifp = m->m_pkthdr.rcvif; 5561541Srgrimes struct ether_header *eh; 55784931Sfjoe struct arc_header *arh; 55844627Sjulian struct iso88025_header *th = (struct iso88025_header *)0; 5591541Srgrimes register struct llinfo_arp *la = 0; 5601541Srgrimes register struct rtentry *rt; 56184102Sjlemon struct ifaddr *ifa; 56284102Sjlemon struct in_ifaddr *ia; 5631541Srgrimes struct sockaddr_dl *sdl; 5641541Srgrimes struct sockaddr sa; 5651541Srgrimes struct in_addr isaddr, itaddr, myaddr; 56658313Slile int op, rif_len; 56784931Sfjoe int req_len; 5681541Srgrimes 56984931Sfjoe req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 57084931Sfjoe if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) { 57174851Syar log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); 57274851Syar return; 57374851Syar } 57474851Syar 57584931Sfjoe ah = mtod(m, struct arphdr *); 57684931Sfjoe op = ntohs(ah->ar_op); 57784931Sfjoe (void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr)); 57884931Sfjoe (void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr)); 57972056Sjulian#ifdef BRIDGE 58072056Sjulian#define BRIDGE_TEST (do_bridge) 58171963Sjulian#else 58272056Sjulian#define BRIDGE_TEST (0) /* cc will optimise the test away */ 58341793Sluigi#endif 58484102Sjlemon /* 58584102Sjlemon * For a bridge, we want to check the address irrespective 58684102Sjlemon * of the receive interface. (This will change slightly 58784102Sjlemon * when we have clusters of interfaces). 58884102Sjlemon */ 58984102Sjlemon LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) 59084931Sfjoe if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) && 59184102Sjlemon itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 59284102Sjlemon goto match; 59384102Sjlemon LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash) 59484931Sfjoe if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) && 59584102Sjlemon isaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 59684102Sjlemon goto match; 59784102Sjlemon /* 59885223Sjlemon * No match, use the first inet address on the receive interface 59984102Sjlemon * as a dummy address for the rest of the function. 60084102Sjlemon */ 60185223Sjlemon TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 60285466Sjlemon if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 60385466Sjlemon ia = ifatoia(ifa); 60485466Sjlemon goto match; 60585466Sjlemon } 60685466Sjlemon /* 60785466Sjlemon * If bridging, fall back to using any inet address. 60885466Sjlemon */ 60985466Sjlemon if (!BRIDGE_TEST || 61085466Sjlemon (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL) { 61112693Sphk m_freem(m); 61212693Sphk return; 61312693Sphk } 61484102Sjlemonmatch: 61584102Sjlemon myaddr = ia->ia_addr.sin_addr; 61684931Sfjoe if (!bcmp(ar_sha(ah), IF_LLADDR(ifp), ifp->if_addrlen)) { 61712693Sphk m_freem(m); /* it's from me, ignore it. */ 61812693Sphk return; 61912693Sphk } 62084931Sfjoe if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { 6211541Srgrimes log(LOG_ERR, 62284931Sfjoe "arp: link address is broadcast for IP address %s!\n", 6237088Swollman inet_ntoa(isaddr)); 62412693Sphk m_freem(m); 62512693Sphk return; 6261541Srgrimes } 6271541Srgrimes if (isaddr.s_addr == myaddr.s_addr) { 6281541Srgrimes log(LOG_ERR, 62984931Sfjoe "arp: %*D is using my IP address %s!\n", 63084931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 63184931Sfjoe inet_ntoa(isaddr)); 6321541Srgrimes itaddr = myaddr; 6331541Srgrimes goto reply; 6341541Srgrimes } 6351541Srgrimes la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0); 6361541Srgrimes if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) { 63772270Sluigi /* the following is not an error when doing bridging */ 63884931Sfjoe if (!BRIDGE_TEST && rt->rt_ifp != ifp) { 63972270Sluigi if (log_arp_wrong_iface) 64084931Sfjoe log(LOG_ERR, "arp: %s is on %s%d but got reply from %*D on %s%d\n", 64171963Sjulian inet_ntoa(isaddr), 64271963Sjulian rt->rt_ifp->if_name, rt->rt_ifp->if_unit, 64384931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 64484931Sfjoe ifp->if_name, ifp->if_unit); 64572270Sluigi goto reply; 64639389Sfenner } 6471541Srgrimes if (sdl->sdl_alen && 64884931Sfjoe bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) { 64982893Salfred if (rt->rt_expire) { 65082893Salfred if (log_arp_movements) 65184931Sfjoe log(LOG_INFO, "arp: %s moved from %*D to %*D on %s%d\n", 65284931Sfjoe inet_ntoa(isaddr), 65384931Sfjoe ifp->if_addrlen, (u_char *)LLADDR(sdl), ":", 65484931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 65584931Sfjoe ifp->if_name, ifp->if_unit); 65682893Salfred } else { 65739389Sfenner log(LOG_ERR, 65884931Sfjoe "arp: %*D attempts to modify permanent entry for %s on %s%d\n", 65984931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 66084931Sfjoe inet_ntoa(isaddr), ifp->if_name, ifp->if_unit); 66139389Sfenner goto reply; 66239389Sfenner } 66346568Speter } 66484931Sfjoe /* 66584931Sfjoe * sanity check for the address length. 66684931Sfjoe * XXX this does not work for protocols with variable address 66784931Sfjoe * length. -is 66884931Sfjoe */ 66984931Sfjoe if (sdl->sdl_alen && 67084931Sfjoe sdl->sdl_alen != ah->ar_hln) { 67184931Sfjoe log(LOG_WARNING, 67284931Sfjoe "arp from %*D: new addr len %d, was %d", 67384931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 67484931Sfjoe ah->ar_hln, sdl->sdl_alen); 67584931Sfjoe } 67684931Sfjoe if (ifp->if_addrlen != ah->ar_hln) { 67784931Sfjoe log(LOG_WARNING, 67884931Sfjoe "arp from %*D: addr len: new %d, i/f %d (ignored)", 67984931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 68084931Sfjoe ah->ar_hln, ifp->if_addrlen); 68184931Sfjoe goto reply; 68284931Sfjoe } 68384931Sfjoe (void)memcpy(LLADDR(sdl), ar_sha(ah), 68484931Sfjoe sdl->sdl_alen = ah->ar_hln); 68558313Slile sdl->sdl_rcf = (u_short)0; 68645705Seivind /* 68745705Seivind * If we receive an arp from a token-ring station over 68845705Seivind * a token-ring nic then try to save the source 68945705Seivind * routing info. 69045705Seivind */ 69184931Sfjoe if (ifp->if_type == IFT_ISO88025) { 69244627Sjulian th = (struct iso88025_header *)m->m_pkthdr.header; 69358313Slile rif_len = TR_RCF_RIFLEN(th->rcf); 69458313Slile if ((th->iso88025_shost[0] & TR_RII) && 69558313Slile (rif_len > 2)) { 69658313Slile sdl->sdl_rcf = th->rcf; 69758313Slile sdl->sdl_rcf ^= htons(TR_RCF_DIR); 69858313Slile memcpy(sdl->sdl_route, th->rd, rif_len - 2); 69958313Slile sdl->sdl_rcf &= ~htons(TR_RCF_BCST_MASK); 70051320Slile /* 70151320Slile * Set up source routing information for 70251320Slile * reply packet (XXX) 70351320Slile */ 70458313Slile m->m_data -= rif_len; 70558313Slile m->m_len += rif_len; 70658313Slile m->m_pkthdr.len += rif_len; 70744627Sjulian } else { 70858313Slile th->iso88025_shost[0] &= ~TR_RII; 70944627Sjulian } 71050512Slile m->m_data -= 8; 71150512Slile m->m_len += 8; 71250512Slile m->m_pkthdr.len += 8; 71344627Sjulian th->rcf = sdl->sdl_rcf; 71445705Seivind } else { 71558313Slile sdl->sdl_rcf = (u_short)0; 71644627Sjulian } 7171541Srgrimes if (rt->rt_expire) 71834961Sphk rt->rt_expire = time_second + arpt_keep; 7191541Srgrimes rt->rt_flags &= ~RTF_REJECT; 7201541Srgrimes la->la_asked = 0; 7211541Srgrimes if (la->la_hold) { 72284931Sfjoe (*ifp->if_output)(ifp, la->la_hold, 7231541Srgrimes rt_key(rt), rt); 7241541Srgrimes la->la_hold = 0; 7251541Srgrimes } 7261541Srgrimes } 7271541Srgrimesreply: 7281541Srgrimes if (op != ARPOP_REQUEST) { 7291541Srgrimes m_freem(m); 7301541Srgrimes return; 7311541Srgrimes } 7321541Srgrimes if (itaddr.s_addr == myaddr.s_addr) { 7331541Srgrimes /* I am the target */ 73484931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 73584931Sfjoe (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); 7361541Srgrimes } else { 7371541Srgrimes la = arplookup(itaddr.s_addr, 0, SIN_PROXY); 7383282Swollman if (la == NULL) { 7393282Swollman struct sockaddr_in sin; 7403282Swollman 74112693Sphk if (!arp_proxyall) { 74212693Sphk m_freem(m); 74312693Sphk return; 74412693Sphk } 7453282Swollman 7463282Swollman bzero(&sin, sizeof sin); 7473282Swollman sin.sin_family = AF_INET; 7483282Swollman sin.sin_len = sizeof sin; 7493282Swollman sin.sin_addr = itaddr; 7503282Swollman 7515101Swollman rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 75212693Sphk if (!rt) { 75312693Sphk m_freem(m); 75412693Sphk return; 75512693Sphk } 7563282Swollman /* 7573282Swollman * Don't send proxies for nodes on the same interface 7583282Swollman * as this one came out of, or we'll get into a fight 7593282Swollman * over who claims what Ether address. 7603282Swollman */ 76184931Sfjoe if (rt->rt_ifp == ifp) { 7623282Swollman rtfree(rt); 76312693Sphk m_freem(m); 76412693Sphk return; 7653282Swollman } 76684931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 76784931Sfjoe (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); 7683282Swollman rtfree(rt); 76963080Sdwmalone 77063080Sdwmalone /* 77163080Sdwmalone * Also check that the node which sent the ARP packet 77263080Sdwmalone * is on the the interface we expect it to be on. This 77363080Sdwmalone * avoids ARP chaos if an interface is connected to the 77463080Sdwmalone * wrong network. 77563080Sdwmalone */ 77663080Sdwmalone sin.sin_addr = isaddr; 77763080Sdwmalone 77863080Sdwmalone rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 77963080Sdwmalone if (!rt) { 78063080Sdwmalone m_freem(m); 78163080Sdwmalone return; 78263080Sdwmalone } 78384931Sfjoe if (rt->rt_ifp != ifp) { 78463080Sdwmalone log(LOG_INFO, "arp_proxy: ignoring request" 78563080Sdwmalone " from %s via %s%d, expecting %s%d\n", 78684931Sfjoe inet_ntoa(isaddr), ifp->if_name, 78784931Sfjoe ifp->if_unit, rt->rt_ifp->if_name, 78863080Sdwmalone rt->rt_ifp->if_unit); 78963080Sdwmalone rtfree(rt); 79063080Sdwmalone m_freem(m); 79163080Sdwmalone return; 79263080Sdwmalone } 79363080Sdwmalone rtfree(rt); 79463080Sdwmalone 7954069Swollman#ifdef DEBUG_PROXY 7968876Srgrimes printf("arp: proxying for %s\n", 7977088Swollman inet_ntoa(itaddr)); 7984069Swollman#endif 7993282Swollman } else { 8003282Swollman rt = la->la_rt; 80184931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 8023282Swollman sdl = SDL(rt->rt_gateway); 80384931Sfjoe (void)memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln); 8043282Swollman } 8051541Srgrimes } 8061541Srgrimes 80784931Sfjoe (void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); 80884931Sfjoe (void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln); 80984931Sfjoe ah->ar_op = htons(ARPOP_REPLY); 81084931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ 81184931Sfjoe switch (ifp->if_type) { 81284931Sfjoe case IFT_ARCNET: 81384931Sfjoe arh = (struct arc_header *)sa.sa_data; 81484931Sfjoe arh->arc_dhost = *ar_tha(ah); 81584931Sfjoe arh->arc_type = ARCTYPE_ARP; 81684931Sfjoe break; 81784931Sfjoe 81845705Seivind case IFT_ISO88025: 81944627Sjulian /* Re-arrange the source/dest address */ 82051320Slile memcpy(th->iso88025_dhost, th->iso88025_shost, 82151320Slile sizeof(th->iso88025_dhost)); 82284931Sfjoe memcpy(th->iso88025_shost, IF_LLADDR(ifp), 82351320Slile sizeof(th->iso88025_shost)); 82444627Sjulian /* Set the source routing bit if neccesary */ 82558313Slile if (th->iso88025_dhost[0] & TR_RII) { 82658313Slile th->iso88025_dhost[0] &= ~TR_RII; 82758313Slile if (TR_RCF_RIFLEN(th->rcf) > 2) 82858313Slile th->iso88025_shost[0] |= TR_RII; 82944627Sjulian } 83044627Sjulian /* Copy the addresses, ac and fc into sa_data */ 83151320Slile memcpy(sa.sa_data, th->iso88025_dhost, 83251320Slile sizeof(th->iso88025_dhost) * 2); 83358313Slile sa.sa_data[(sizeof(th->iso88025_dhost) * 2)] = TR_AC; 83458313Slile sa.sa_data[(sizeof(th->iso88025_dhost) * 2) + 1] = TR_LLC_FRAME; 83544627Sjulian break; 83645705Seivind case IFT_ETHER: 83751320Slile case IFT_FDDI: 83851320Slile /* 83951320Slile * May not be correct for types not explictly 84051320Slile * listed, but it is our best guess. 84151320Slile */ 84251320Slile default: 84344627Sjulian eh = (struct ether_header *)sa.sa_data; 84484931Sfjoe (void)memcpy(eh->ether_dhost, ar_tha(ah), 84551320Slile sizeof(eh->ether_dhost)); 84644627Sjulian eh->ether_type = htons(ETHERTYPE_ARP); 84744627Sjulian break; 84844627Sjulian } 8491541Srgrimes sa.sa_family = AF_UNSPEC; 8501541Srgrimes sa.sa_len = sizeof(sa); 85184931Sfjoe (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 8521541Srgrimes return; 8531541Srgrimes} 85432350Seivind#endif 8551541Srgrimes 8561541Srgrimes/* 8571541Srgrimes * Free an arp entry. 8581541Srgrimes */ 8591541Srgrimesstatic void 8601541Srgrimesarptfree(la) 8611541Srgrimes register struct llinfo_arp *la; 8621541Srgrimes{ 8631541Srgrimes register struct rtentry *rt = la->la_rt; 8641541Srgrimes register struct sockaddr_dl *sdl; 8651541Srgrimes if (rt == 0) 8661541Srgrimes panic("arptfree"); 8671541Srgrimes if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) && 8681541Srgrimes sdl->sdl_family == AF_LINK) { 8691541Srgrimes sdl->sdl_alen = 0; 8701541Srgrimes la->la_asked = 0; 8711541Srgrimes rt->rt_flags &= ~RTF_REJECT; 8721541Srgrimes return; 8731541Srgrimes } 8741541Srgrimes rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt), 8751541Srgrimes 0, (struct rtentry **)0); 8761541Srgrimes} 8771541Srgrimes/* 8781541Srgrimes * Lookup or enter a new address in arptab. 8791541Srgrimes */ 8801541Srgrimesstatic struct llinfo_arp * 8811541Srgrimesarplookup(addr, create, proxy) 8821541Srgrimes u_long addr; 8831541Srgrimes int create, proxy; 8841541Srgrimes{ 8851541Srgrimes register struct rtentry *rt; 8861541Srgrimes static struct sockaddr_inarp sin = {sizeof(sin), AF_INET }; 8874069Swollman const char *why = 0; 8881541Srgrimes 8891541Srgrimes sin.sin_addr.s_addr = addr; 8901541Srgrimes sin.sin_other = proxy ? SIN_PROXY : 0; 8915101Swollman rt = rtalloc1((struct sockaddr *)&sin, create, 0UL); 8921541Srgrimes if (rt == 0) 8931541Srgrimes return (0); 8941541Srgrimes rt->rt_refcnt--; 8954069Swollman 89612693Sphk if (rt->rt_flags & RTF_GATEWAY) 8974069Swollman why = "host is not on local network"; 89812693Sphk else if ((rt->rt_flags & RTF_LLINFO) == 0) 8994069Swollman why = "could not allocate llinfo"; 90012693Sphk else if (rt->rt_gateway->sa_family != AF_LINK) 9014069Swollman why = "gateway route is not ours"; 9024069Swollman 90312693Sphk if (why && create) { 9044069Swollman log(LOG_DEBUG, "arplookup %s failed: %s\n", 9057088Swollman inet_ntoa(sin.sin_addr), why); 9064069Swollman return 0; 90712693Sphk } else if (why) { 9084069Swollman return 0; 9091541Srgrimes } 9101541Srgrimes return ((struct llinfo_arp *)rt->rt_llinfo); 9111541Srgrimes} 9121541Srgrimes 9135195Swollmanvoid 91484931Sfjoearp_ifinit(ifp, ifa) 91584931Sfjoe struct ifnet *ifp; 9165195Swollman struct ifaddr *ifa; 9175195Swollman{ 91825822Stegge if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) 91984931Sfjoe arprequest(ifp, &IA_SIN(ifa)->sin_addr, 92084931Sfjoe &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp)); 9215195Swollman ifa->ifa_rtrequest = arp_rtrequest; 9225195Swollman ifa->ifa_flags |= RTF_CLONING; 9235195Swollman} 92469152Sjlemon 92569152Sjlemonstatic void 92669152Sjlemonarp_init(void) 92769152Sjlemon{ 92869152Sjlemon 92969152Sjlemon arpintrq.ifq_maxlen = 50; 93069152Sjlemon mtx_init(&arpintrq.ifq_mtx, "arp_inq", MTX_DEF); 93169152Sjlemon} 93269152Sjlemon 93369152SjlemonSYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0); 934