if_ether.c revision 120626
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 120626 2003-10-01 08:32:37Z ru $ 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" 45101090Srwatson#include "opt_mac.h" 4632350Seivind 471541Srgrimes#include <sys/param.h> 4812693Sphk#include <sys/kernel.h> 4944078Sdfr#include <sys/queue.h> 5012693Sphk#include <sys/sysctl.h> 511541Srgrimes#include <sys/systm.h> 52101090Srwatson#include <sys/mac.h> 5312693Sphk#include <sys/mbuf.h> 541541Srgrimes#include <sys/malloc.h> 5518892Sbde#include <sys/socket.h> 561541Srgrimes#include <sys/syslog.h> 571541Srgrimes 581541Srgrimes#include <net/if.h> 591541Srgrimes#include <net/if_dl.h> 6044165Sjulian#include <net/if_types.h> 611541Srgrimes#include <net/route.h> 628426Swollman#include <net/netisr.h> 6358313Slile#include <net/if_llc.h> 6471963Sjulian#ifdef BRIDGE 6571963Sjulian#include <net/ethernet.h> 6671963Sjulian#include <net/bridge.h> 6771963Sjulian#endif 681541Srgrimes 691541Srgrimes#include <netinet/in.h> 701541Srgrimes#include <netinet/in_var.h> 711541Srgrimes#include <netinet/if_ether.h> 721541Srgrimes 7384931Sfjoe#include <net/if_arc.h> 7444627Sjulian#include <net/iso88025.h> 7544627Sjulian 761541Srgrimes#define SIN(s) ((struct sockaddr_in *)s) 771541Srgrimes#define SDL(s) ((struct sockaddr_dl *)s) 781541Srgrimes 7944078SdfrSYSCTL_DECL(_net_link_ether); 8012942SwollmanSYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, ""); 811541Srgrimes 8212693Sphk/* timer values */ 8312942Swollmanstatic int arpt_prune = (5*60*1); /* walk list every 5 minutes */ 8412942Swollmanstatic int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ 8512942Swollmanstatic int arpt_down = 20; /* once declared down, don't send for 20 sec */ 861541Srgrimes 8712942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW, 8812942Swollman &arpt_prune, 0, ""); 8912942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW, 9012942Swollman &arpt_keep, 0, ""); 9112942SwollmanSYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW, 9212942Swollman &arpt_down, 0, ""); 9312693Sphk 941541Srgrimes#define rt_expire rt_rmx.rmx_expire 951541Srgrimes 9611225Swollmanstruct llinfo_arp { 9760938Sjake LIST_ENTRY(llinfo_arp) la_le; 9811225Swollman struct rtentry *la_rt; 99110308Sorion struct mbuf *la_hold; /* last packet until resolved/timeout */ 100110544Sorion u_short la_preempt; /* countdown for pre-expiry arps */ 101110308Sorion u_short la_asked; /* #times we QUERIED following expiration */ 10211225Swollman#define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ 10311225Swollman}; 10412693Sphk 10560938Sjakestatic LIST_HEAD(, llinfo_arp) llinfo_arp; 10611225Swollman 107111888Sjlemonstatic struct ifqueue arpintrq; 10898459Speterstatic int arp_inuse, arp_allocated, arpinit_done; 1091541Srgrimes 11012693Sphkstatic int arp_maxtries = 5; 11112942Swollmanstatic int useloopback = 1; /* use loopback interface for local traffic */ 11212942Swollmanstatic int arp_proxyall = 0; 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 int s = splnet(); 1441541Srgrimes 145109996Shsu RADIX_NODE_HEAD_LOCK(rt_tables[AF_INET]); 146109409Shsu la = LIST_FIRST(&llinfo_arp); 147109409Shsu while (la != NULL) { 148109409Shsu struct rtentry *rt = la->la_rt; 149109409Shsu ola = la; 15071999Sphk la = LIST_NEXT(la, la_le); 15134961Sphk if (rt->rt_expire && rt->rt_expire <= time_second) 152109409Shsu arptfree(ola); /* timer has expired, clear */ 1531541Srgrimes } 154109996Shsu RADIX_NODE_HEAD_UNLOCK(rt_tables[AF_INET]); 1551541Srgrimes splx(s); 156109996Shsu timeout(arptimer, NULL, arpt_prune * hz); 1571541Srgrimes} 1581541Srgrimes 1591541Srgrimes/* 1601541Srgrimes * Parallel to llc_rtrequest. 1611541Srgrimes */ 1625196Swollmanstatic void 16385074Sruarp_rtrequest(req, rt, info) 1641541Srgrimes int req; 1651541Srgrimes register struct rtentry *rt; 16685074Sru struct rt_addrinfo *info; 1671541Srgrimes{ 1681541Srgrimes register struct sockaddr *gate = rt->rt_gateway; 1691541Srgrimes register struct llinfo_arp *la = (struct llinfo_arp *)rt->rt_llinfo; 1701541Srgrimes static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; 1711541Srgrimes 1721541Srgrimes if (!arpinit_done) { 1731541Srgrimes arpinit_done = 1; 1741541Srgrimes timeout(arptimer, (caddr_t)0, hz); 1751541Srgrimes } 1761541Srgrimes if (rt->rt_flags & RTF_GATEWAY) 1771541Srgrimes return; 1781541Srgrimes switch (req) { 1791541Srgrimes 1801541Srgrimes case RTM_ADD: 1811541Srgrimes /* 1821541Srgrimes * XXX: If this is a manually added route to interface 1831541Srgrimes * such as older version of routed or gated might provide, 1841541Srgrimes * restore cloning bit. 1851541Srgrimes */ 1861541Srgrimes if ((rt->rt_flags & RTF_HOST) == 0 && 1871541Srgrimes SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) 1881541Srgrimes rt->rt_flags |= RTF_CLONING; 1891541Srgrimes if (rt->rt_flags & RTF_CLONING) { 1901541Srgrimes /* 1911541Srgrimes * Case 1: This route should come from a route to iface. 1921541Srgrimes */ 1931541Srgrimes rt_setgate(rt, rt_key(rt), 1941541Srgrimes (struct sockaddr *)&null_sdl); 1951541Srgrimes gate = rt->rt_gateway; 1961541Srgrimes SDL(gate)->sdl_type = rt->rt_ifp->if_type; 1971541Srgrimes SDL(gate)->sdl_index = rt->rt_ifp->if_index; 19834961Sphk rt->rt_expire = time_second; 1991541Srgrimes break; 2001541Srgrimes } 2011541Srgrimes /* Announce a new entry if requested. */ 2021541Srgrimes if (rt->rt_flags & RTF_ANNOUNCE) 20384931Sfjoe arprequest(rt->rt_ifp, 20436908Sjulian &SIN(rt_key(rt))->sin_addr, 20536908Sjulian &SIN(rt_key(rt))->sin_addr, 2061541Srgrimes (u_char *)LLADDR(SDL(gate))); 2071541Srgrimes /*FALLTHROUGH*/ 2081541Srgrimes case RTM_RESOLVE: 2091541Srgrimes if (gate->sa_family != AF_LINK || 2101541Srgrimes gate->sa_len < sizeof(null_sdl)) { 2116568Sdg log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n"); 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 */ 2221541Srgrimes R_Malloc(la, struct llinfo_arp *, sizeof(*la)); 2231541Srgrimes rt->rt_llinfo = (caddr_t)la; 2241541Srgrimes if (la == 0) { 2251541Srgrimes log(LOG_DEBUG, "arp_rtrequest: malloc failed\n"); 2261541Srgrimes break; 2271541Srgrimes } 2281541Srgrimes arp_inuse++, arp_allocated++; 2291541Srgrimes Bzero(la, sizeof(*la)); 2301541Srgrimes la->la_rt = rt; 2311541Srgrimes rt->rt_flags |= RTF_LLINFO; 232109996Shsu RADIX_NODE_HEAD_LOCK_ASSERT(rt_tables[AF_INET]); 23311225Swollman LIST_INSERT_HEAD(&llinfo_arp, la, la_le); 23413926Swollman 23532350Seivind#ifdef INET 23613926Swollman /* 23713926Swollman * This keeps the multicast addresses from showing up 23813926Swollman * in `arp -a' listings as unresolved. It's not actually 23913926Swollman * functional. Then the same for broadcast. 24013926Swollman */ 24187776Sjlemon if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr)) && 24287776Sjlemon rt->rt_ifp->if_type != IFT_ARCNET) { 24313926Swollman ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr, 24413926Swollman LLADDR(SDL(gate))); 24513926Swollman SDL(gate)->sdl_alen = 6; 24616576Speter rt->rt_expire = 0; 24713926Swollman } 24813926Swollman if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) { 24984931Sfjoe memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr, 25084931Sfjoe rt->rt_ifp->if_addrlen); 25184931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen; 25216576Speter rt->rt_expire = 0; 25313926Swollman } 25432350Seivind#endif 25513926Swollman 2561541Srgrimes if (SIN(rt_key(rt))->sin_addr.s_addr == 2571541Srgrimes (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) { 2581541Srgrimes /* 2591541Srgrimes * This test used to be 2601541Srgrimes * if (loif.if_flags & IFF_UP) 2611541Srgrimes * It allowed local traffic to be forced 2621541Srgrimes * through the hardware by configuring the loopback down. 2631541Srgrimes * However, it causes problems during network configuration 2641541Srgrimes * for boards that can't receive packets they send. 2651541Srgrimes * It is now necessary to clear "useloopback" and remove 2661541Srgrimes * the route to force traffic out to the hardware. 2671541Srgrimes */ 2681541Srgrimes rt->rt_expire = 0; 26984931Sfjoe Bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)), 27084931Sfjoe SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen); 2711541Srgrimes if (useloopback) 2728090Spst rt->rt_ifp = loif; 2731541Srgrimes 2741541Srgrimes } 2751541Srgrimes break; 2761541Srgrimes 2771541Srgrimes case RTM_DELETE: 2781541Srgrimes if (la == 0) 2791541Srgrimes break; 2801541Srgrimes arp_inuse--; 281109996Shsu RADIX_NODE_HEAD_LOCK_ASSERT(rt_tables[AF_INET]); 28211225Swollman LIST_REMOVE(la, la_le); 2831541Srgrimes rt->rt_llinfo = 0; 2841541Srgrimes rt->rt_flags &= ~RTF_LLINFO; 2851541Srgrimes if (la->la_hold) 2861541Srgrimes m_freem(la->la_hold); 2871541Srgrimes Free((caddr_t)la); 2881541Srgrimes } 2891541Srgrimes} 2901541Srgrimes 2911541Srgrimes/* 2921541Srgrimes * Broadcast an ARP request. Caller specifies: 2931541Srgrimes * - arp header source ip address 2941541Srgrimes * - arp header target ip address 2951541Srgrimes * - arp header source ethernet address 2961541Srgrimes */ 2971541Srgrimesstatic void 29884931Sfjoearprequest(ifp, sip, tip, enaddr) 29984931Sfjoe register struct ifnet *ifp; 30036908Sjulian register struct in_addr *sip, *tip; 3011541Srgrimes register u_char *enaddr; 3021541Srgrimes{ 3031541Srgrimes register struct mbuf *m; 3041541Srgrimes register struct ether_header *eh; 30584931Sfjoe register struct arc_header *arh; 30684931Sfjoe register struct arphdr *ah; 3071541Srgrimes struct sockaddr sa; 30858313Slile static u_char llcx[] = { 0x82, 0x40, LLC_SNAP_LSAP, LLC_SNAP_LSAP, 30958313Slile LLC_UI, 0x00, 0x00, 0x00, 0x08, 0x06 }; 31084931Sfjoe u_short ar_hrd; 3111541Srgrimes 312111119Simp if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) 3131541Srgrimes return; 31444456Swpaul m->m_pkthdr.rcvif = (struct ifnet *)0; 315101090Srwatson#ifdef MAC 316101090Srwatson mac_create_mbuf_linklayer(ifp, m); 317101090Srwatson#endif 31884931Sfjoe switch (ifp->if_type) { 31984931Sfjoe case IFT_ARCNET: 32084931Sfjoe ar_hrd = htons(ARPHRD_ARCNET); 32184931Sfjoe 32284931Sfjoe m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 32384931Sfjoe m->m_pkthdr.len = m->m_len; 32484931Sfjoe MH_ALIGN(m, m->m_len); 32584931Sfjoe 32684931Sfjoe arh = (struct arc_header *)sa.sa_data; 32784931Sfjoe arh->arc_dhost = *ifp->if_broadcastaddr; 32884931Sfjoe arh->arc_type = ARCTYPE_ARP; 32984931Sfjoe 33084931Sfjoe ah = mtod(m, struct arphdr *); 33184931Sfjoe break; 33284931Sfjoe 33344627Sjulian case IFT_ISO88025: 33484931Sfjoe ar_hrd = htons(ARPHRD_IEEE802); 33584931Sfjoe 33684931Sfjoe m->m_len = sizeof(llcx) + 33784931Sfjoe arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 33884931Sfjoe m->m_pkthdr.len = m->m_len; 33984931Sfjoe MH_ALIGN(m, m->m_len); 34084931Sfjoe 34158313Slile (void)memcpy(mtod(m, caddr_t), llcx, sizeof(llcx)); 34284931Sfjoe (void)memcpy(sa.sa_data, ifp->if_broadcastaddr, 6); 34344627Sjulian (void)memcpy(sa.sa_data + 6, enaddr, 6); 34458313Slile sa.sa_data[6] |= TR_RII; 34558313Slile sa.sa_data[12] = TR_AC; 34658313Slile sa.sa_data[13] = TR_LLC_FRAME; 34784931Sfjoe 34884931Sfjoe ah = (struct arphdr *)(mtod(m, char *) + sizeof(llcx)); 34944627Sjulian break; 35051320Slile case IFT_FDDI: 35151320Slile case IFT_ETHER: 35251320Slile /* 35351320Slile * This may not be correct for types not explicitly 35451320Slile * listed, but this is our best guess 35551320Slile */ 35644627Sjulian default: 35784931Sfjoe ar_hrd = htons(ARPHRD_ETHER); 35884931Sfjoe 35984931Sfjoe m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 36084931Sfjoe m->m_pkthdr.len = m->m_len; 36184931Sfjoe MH_ALIGN(m, m->m_len); 36284931Sfjoe 36351320Slile eh = (struct ether_header *)sa.sa_data; 36451320Slile /* if_output will not swap */ 36551320Slile eh->ether_type = htons(ETHERTYPE_ARP); 36684931Sfjoe (void)memcpy(eh->ether_dhost, ifp->if_broadcastaddr, 36751320Slile sizeof(eh->ether_dhost)); 36884931Sfjoe 36984931Sfjoe ah = mtod(m, struct arphdr *); 37051320Slile break; 37144627Sjulian } 37284931Sfjoe 37384931Sfjoe ah->ar_hrd = ar_hrd; 37484931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); 37584931Sfjoe ah->ar_hln = ifp->if_addrlen; /* hardware address length */ 37684931Sfjoe ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ 37784931Sfjoe ah->ar_op = htons(ARPOP_REQUEST); 37884931Sfjoe (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln); 379109035Stmm memset(ar_tha(ah), 0, ah->ar_hln); 38084931Sfjoe (void)memcpy(ar_spa(ah), sip, ah->ar_pln); 38184931Sfjoe (void)memcpy(ar_tpa(ah), tip, ah->ar_pln); 38284931Sfjoe 3831541Srgrimes sa.sa_family = AF_UNSPEC; 3841541Srgrimes sa.sa_len = sizeof(sa); 38584931Sfjoe (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 3861541Srgrimes} 3871541Srgrimes 3881541Srgrimes/* 3891541Srgrimes * Resolve an IP address into an ethernet address. If success, 3901541Srgrimes * desten is filled in. If there is no entry in arptab, 3911541Srgrimes * set one up and broadcast a request for the IP address. 3921541Srgrimes * Hold onto this mbuf and resend it once the address 3931541Srgrimes * is finally resolved. A return value of 1 indicates 3941541Srgrimes * that desten has been filled in and the packet should be sent 3951541Srgrimes * normally; a 0 return indicates that the packet has been 3961541Srgrimes * taken over here, either now or for later transmission. 3971541Srgrimes */ 3981541Srgrimesint 39984931Sfjoearpresolve(ifp, rt, m, dst, desten, rt0) 40084931Sfjoe register struct ifnet *ifp; 4011541Srgrimes register struct rtentry *rt; 4021541Srgrimes struct mbuf *m; 4031541Srgrimes register struct sockaddr *dst; 4041541Srgrimes register u_char *desten; 4053514Swollman struct rtentry *rt0; 4061541Srgrimes{ 40778295Sjlemon struct llinfo_arp *la = 0; 4081541Srgrimes struct sockaddr_dl *sdl; 4091541Srgrimes 4101541Srgrimes if (m->m_flags & M_BCAST) { /* broadcast */ 41184931Sfjoe (void)memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen); 4121541Srgrimes return (1); 4131541Srgrimes } 41484931Sfjoe if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {/* multicast */ 4151541Srgrimes ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten); 4161541Srgrimes return(1); 4171541Srgrimes } 4181541Srgrimes if (rt) 4191541Srgrimes la = (struct llinfo_arp *)rt->rt_llinfo; 42042775Sfenner if (la == 0) { 4213311Sphk la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0); 4223311Sphk if (la) 4231541Srgrimes rt = la->la_rt; 4241541Srgrimes } 4251541Srgrimes if (la == 0 || rt == 0) { 42636308Sphk log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n", 42736308Sphk inet_ntoa(SIN(dst)->sin_addr), la ? "la" : "", 42836308Sphk rt ? "rt" : ""); 4291541Srgrimes m_freem(m); 4301541Srgrimes return (0); 4311541Srgrimes } 4321541Srgrimes sdl = SDL(rt->rt_gateway); 4331541Srgrimes /* 4341541Srgrimes * Check the address family and length is valid, the address 4351541Srgrimes * is resolved; otherwise, try to resolve. 4361541Srgrimes */ 43734961Sphk if ((rt->rt_expire == 0 || rt->rt_expire > time_second) && 4381541Srgrimes sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) { 43992802Sorion /* 44092802Sorion * If entry has an expiry time and it is approaching, 44192802Sorion * see if we need to send an ARP request within this 44292802Sorion * arpt_down interval. 44392802Sorion */ 44492802Sorion if ((rt->rt_expire != 0) && 445110544Sorion (time_second + la->la_preempt > rt->rt_expire)) { 44692802Sorion arprequest(ifp, 44792802Sorion &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 44892802Sorion &SIN(dst)->sin_addr, 44992802Sorion IF_LLADDR(ifp)); 450110544Sorion la->la_preempt--; 45192802Sorion } 45292802Sorion 45316206Sbde bcopy(LLADDR(sdl), desten, sdl->sdl_alen); 4541541Srgrimes return 1; 4551541Srgrimes } 4561541Srgrimes /* 457120626Sru * If ARP is disabled or static on this interface, stop. 45878295Sjlemon * XXX 45978295Sjlemon * Probably should not allocate empty llinfo struct if we are 46078295Sjlemon * not going to be sending out an arp request. 46178295Sjlemon */ 462120626Sru if (ifp->if_flags & (IFF_NOARP | IFF_STATICARP)) { 46387410Sru m_freem(m); 46478295Sjlemon return (0); 46587410Sru } 46678295Sjlemon /* 4671541Srgrimes * There is an arptab entry, but no ethernet address 4681541Srgrimes * response yet. Replace the held mbuf with this 4691541Srgrimes * latest one. 4701541Srgrimes */ 4711541Srgrimes if (la->la_hold) 4721541Srgrimes m_freem(la->la_hold); 4731541Srgrimes la->la_hold = m; 4741541Srgrimes if (rt->rt_expire) { 4751541Srgrimes rt->rt_flags &= ~RTF_REJECT; 47634961Sphk if (la->la_asked == 0 || rt->rt_expire != time_second) { 47734961Sphk rt->rt_expire = time_second; 478110308Sorion if (la->la_asked++ < arp_maxtries) { 479110308Sorion arprequest(ifp, 480110308Sorion &SIN(rt->rt_ifa->ifa_addr)->sin_addr, 481110308Sorion &SIN(dst)->sin_addr, 482110308Sorion IF_LLADDR(ifp)); 483110308Sorion } else { 4841541Srgrimes rt->rt_flags |= RTF_REJECT; 4851541Srgrimes rt->rt_expire += arpt_down; 486110544Sorion la->la_asked = 0; 487110544Sorion la->la_preempt = arp_maxtries; 4881541Srgrimes } 4891541Srgrimes 4901541Srgrimes } 4911541Srgrimes } 4921541Srgrimes return (0); 4931541Srgrimes} 4941541Srgrimes 4951541Srgrimes/* 4961541Srgrimes * Common length and type checks are done here, 4971541Srgrimes * then the protocol-specific routine is called. 4981541Srgrimes */ 49912693Sphkstatic void 500111888Sjlemonarpintr(struct mbuf *m) 5011541Srgrimes{ 502111888Sjlemon struct arphdr *ar; 5031541Srgrimes 50498459Speter if (!arpinit_done) { 50598459Speter arpinit_done = 1; 50698459Speter timeout(arptimer, (caddr_t)0, hz); 50798459Speter } 508111888Sjlemon if (m->m_len < sizeof(struct arphdr) && 509111888Sjlemon ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) { 510111888Sjlemon log(LOG_ERR, "arp: runt packet -- m_pullup failed\n"); 511111888Sjlemon return; 512111888Sjlemon } 513111888Sjlemon ar = mtod(m, struct arphdr *); 5141541Srgrimes 515111888Sjlemon if (ntohs(ar->ar_hrd) != ARPHRD_ETHER && 516111888Sjlemon ntohs(ar->ar_hrd) != ARPHRD_IEEE802 && 517111888Sjlemon ntohs(ar->ar_hrd) != ARPHRD_ARCNET) { 518111888Sjlemon log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n", 519111888Sjlemon (unsigned char *)&ar->ar_hrd, ""); 520111888Sjlemon m_freem(m); 521111888Sjlemon return; 522111888Sjlemon } 5231541Srgrimes 524111888Sjlemon if (m->m_pkthdr.len < arphdr_len(ar) && 525111888Sjlemon (m = m_pullup(m, arphdr_len(ar))) == NULL) { 526111888Sjlemon log(LOG_ERR, "arp: runt packet\n"); 527111888Sjlemon m_freem(m); 528111888Sjlemon return; 529111888Sjlemon } 53057900Srwatson 531111888Sjlemon switch (ntohs(ar->ar_pro)) { 53232350Seivind#ifdef INET 533111888Sjlemon case ETHERTYPE_IP: 534111888Sjlemon in_arpinput(m); 535111888Sjlemon return; 53632350Seivind#endif 5371541Srgrimes } 538111888Sjlemon m_freem(m); 5391541Srgrimes} 5401541Srgrimes 54132350Seivind#ifdef INET 5421541Srgrimes/* 5431541Srgrimes * ARP for Internet protocols on 10 Mb/s Ethernet. 5441541Srgrimes * Algorithm is that given in RFC 826. 5451541Srgrimes * In addition, a sanity check is performed on the sender 5461541Srgrimes * protocol address, to catch impersonators. 5471541Srgrimes * We no longer handle negotiations for use of trailer protocol: 5481541Srgrimes * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent 5491541Srgrimes * along with IP replies if we wanted trailers sent to us, 5501541Srgrimes * and also sent them in response to IP replies. 5511541Srgrimes * This allowed either end to announce the desire to receive 5521541Srgrimes * trailer packets. 5531541Srgrimes * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, 5541541Srgrimes * but formerly didn't normally send requests. 5551541Srgrimes */ 55670699Salfredstatic int log_arp_wrong_iface = 1; 55782893Salfredstatic int log_arp_movements = 1; 55870699Salfred 55970699SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW, 56070699Salfred &log_arp_wrong_iface, 0, 56170699Salfred "log arp packets arriving on the wrong interface"); 56282893SalfredSYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW, 56382893Salfred &log_arp_movements, 0, 56482966Salfred "log arp replies from MACs different than the one in the cache"); 56570699Salfred 56682893Salfred 5671541Srgrimesstatic void 5681541Srgrimesin_arpinput(m) 5691541Srgrimes struct mbuf *m; 5701541Srgrimes{ 57184931Sfjoe register struct arphdr *ah; 57284931Sfjoe register struct ifnet *ifp = m->m_pkthdr.rcvif; 5731541Srgrimes struct ether_header *eh; 57484931Sfjoe struct arc_header *arh; 57544627Sjulian struct iso88025_header *th = (struct iso88025_header *)0; 57696184Skbyanc struct iso88025_sockaddr_dl_data *trld; 5771541Srgrimes register struct llinfo_arp *la = 0; 5781541Srgrimes register struct rtentry *rt; 57984102Sjlemon struct ifaddr *ifa; 58084102Sjlemon struct in_ifaddr *ia; 5811541Srgrimes struct sockaddr_dl *sdl; 5821541Srgrimes struct sockaddr sa; 5831541Srgrimes struct in_addr isaddr, itaddr, myaddr; 58458313Slile int op, rif_len; 58584931Sfjoe int req_len; 5861541Srgrimes 58784931Sfjoe req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); 58884931Sfjoe if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) { 58974851Syar log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); 59074851Syar return; 59174851Syar } 59274851Syar 59384931Sfjoe ah = mtod(m, struct arphdr *); 59484931Sfjoe op = ntohs(ah->ar_op); 59584931Sfjoe (void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr)); 59684931Sfjoe (void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr)); 59772056Sjulian#ifdef BRIDGE 59872056Sjulian#define BRIDGE_TEST (do_bridge) 59971963Sjulian#else 60072056Sjulian#define BRIDGE_TEST (0) /* cc will optimise the test away */ 60141793Sluigi#endif 60284102Sjlemon /* 60384102Sjlemon * For a bridge, we want to check the address irrespective 60484102Sjlemon * of the receive interface. (This will change slightly 60584102Sjlemon * when we have clusters of interfaces). 60684102Sjlemon */ 60784102Sjlemon LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) 60884931Sfjoe if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) && 60984102Sjlemon itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 61084102Sjlemon goto match; 61184102Sjlemon LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash) 61284931Sfjoe if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) && 61384102Sjlemon isaddr.s_addr == ia->ia_addr.sin_addr.s_addr) 61484102Sjlemon goto match; 61584102Sjlemon /* 61685223Sjlemon * No match, use the first inet address on the receive interface 61784102Sjlemon * as a dummy address for the rest of the function. 61884102Sjlemon */ 61985223Sjlemon TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) 62085466Sjlemon if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { 62185466Sjlemon ia = ifatoia(ifa); 62285466Sjlemon goto match; 62385466Sjlemon } 62485466Sjlemon /* 62585466Sjlemon * If bridging, fall back to using any inet address. 62685466Sjlemon */ 62785466Sjlemon if (!BRIDGE_TEST || 62885466Sjlemon (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL) { 62912693Sphk m_freem(m); 63012693Sphk return; 63112693Sphk } 63284102Sjlemonmatch: 63384102Sjlemon myaddr = ia->ia_addr.sin_addr; 63484931Sfjoe if (!bcmp(ar_sha(ah), IF_LLADDR(ifp), ifp->if_addrlen)) { 63512693Sphk m_freem(m); /* it's from me, ignore it. */ 63612693Sphk return; 63712693Sphk } 63884931Sfjoe if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { 6391541Srgrimes log(LOG_ERR, 64084931Sfjoe "arp: link address is broadcast for IP address %s!\n", 6417088Swollman inet_ntoa(isaddr)); 64212693Sphk m_freem(m); 64312693Sphk return; 6441541Srgrimes } 6451541Srgrimes if (isaddr.s_addr == myaddr.s_addr) { 6461541Srgrimes log(LOG_ERR, 64784931Sfjoe "arp: %*D is using my IP address %s!\n", 64884931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 64984931Sfjoe inet_ntoa(isaddr)); 6501541Srgrimes itaddr = myaddr; 6511541Srgrimes goto reply; 6521541Srgrimes } 653120626Sru if (ifp->if_flags & IFF_STATICARP) 654120626Sru goto reply; 6551541Srgrimes la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0); 6561541Srgrimes if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) { 65772270Sluigi /* the following is not an error when doing bridging */ 65884931Sfjoe if (!BRIDGE_TEST && rt->rt_ifp != ifp) { 65972270Sluigi if (log_arp_wrong_iface) 66084931Sfjoe log(LOG_ERR, "arp: %s is on %s%d but got reply from %*D on %s%d\n", 66171963Sjulian inet_ntoa(isaddr), 66271963Sjulian rt->rt_ifp->if_name, rt->rt_ifp->if_unit, 66384931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 66484931Sfjoe ifp->if_name, ifp->if_unit); 66572270Sluigi goto reply; 66639389Sfenner } 6671541Srgrimes if (sdl->sdl_alen && 66884931Sfjoe bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) { 66982893Salfred if (rt->rt_expire) { 67082893Salfred if (log_arp_movements) 67184931Sfjoe log(LOG_INFO, "arp: %s moved from %*D to %*D on %s%d\n", 67284931Sfjoe inet_ntoa(isaddr), 67384931Sfjoe ifp->if_addrlen, (u_char *)LLADDR(sdl), ":", 67484931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 67584931Sfjoe ifp->if_name, ifp->if_unit); 67682893Salfred } else { 67739389Sfenner log(LOG_ERR, 67884931Sfjoe "arp: %*D attempts to modify permanent entry for %s on %s%d\n", 67984931Sfjoe ifp->if_addrlen, (u_char *)ar_sha(ah), ":", 68084931Sfjoe inet_ntoa(isaddr), ifp->if_name, ifp->if_unit); 68139389Sfenner goto reply; 68239389Sfenner } 68346568Speter } 68484931Sfjoe /* 68584931Sfjoe * sanity check for the address length. 68684931Sfjoe * XXX this does not work for protocols with variable address 68784931Sfjoe * length. -is 68884931Sfjoe */ 68984931Sfjoe if (sdl->sdl_alen && 69084931Sfjoe sdl->sdl_alen != ah->ar_hln) { 69184931Sfjoe log(LOG_WARNING, 69284931Sfjoe "arp from %*D: new addr len %d, was %d", 69384931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 69484931Sfjoe ah->ar_hln, sdl->sdl_alen); 69584931Sfjoe } 69684931Sfjoe if (ifp->if_addrlen != ah->ar_hln) { 69784931Sfjoe log(LOG_WARNING, 69884931Sfjoe "arp from %*D: addr len: new %d, i/f %d (ignored)", 69984931Sfjoe ifp->if_addrlen, (u_char *) ar_sha(ah), ":", 70084931Sfjoe ah->ar_hln, ifp->if_addrlen); 70184931Sfjoe goto reply; 70284931Sfjoe } 70384931Sfjoe (void)memcpy(LLADDR(sdl), ar_sha(ah), 70484931Sfjoe sdl->sdl_alen = ah->ar_hln); 70545705Seivind /* 70645705Seivind * If we receive an arp from a token-ring station over 70745705Seivind * a token-ring nic then try to save the source 70845705Seivind * routing info. 70945705Seivind */ 71084931Sfjoe if (ifp->if_type == IFT_ISO88025) { 71144627Sjulian th = (struct iso88025_header *)m->m_pkthdr.header; 71296184Skbyanc trld = SDL_ISO88025(sdl); 71358313Slile rif_len = TR_RCF_RIFLEN(th->rcf); 71458313Slile if ((th->iso88025_shost[0] & TR_RII) && 71558313Slile (rif_len > 2)) { 71696184Skbyanc trld->trld_rcf = th->rcf; 71796184Skbyanc trld->trld_rcf ^= htons(TR_RCF_DIR); 71896184Skbyanc memcpy(trld->trld_route, th->rd, rif_len - 2); 71996184Skbyanc trld->trld_rcf &= ~htons(TR_RCF_BCST_MASK); 72051320Slile /* 72151320Slile * Set up source routing information for 72251320Slile * reply packet (XXX) 72351320Slile */ 72458313Slile m->m_data -= rif_len; 72558313Slile m->m_len += rif_len; 72658313Slile m->m_pkthdr.len += rif_len; 72744627Sjulian } else { 72858313Slile th->iso88025_shost[0] &= ~TR_RII; 72996624Skbyanc trld->trld_rcf = 0; 73044627Sjulian } 73150512Slile m->m_data -= 8; 73250512Slile m->m_len += 8; 73350512Slile m->m_pkthdr.len += 8; 73496184Skbyanc th->rcf = trld->trld_rcf; 73544627Sjulian } 7361541Srgrimes if (rt->rt_expire) 73734961Sphk rt->rt_expire = time_second + arpt_keep; 7381541Srgrimes rt->rt_flags &= ~RTF_REJECT; 739110544Sorion la->la_asked = 0; 740110544Sorion la->la_preempt = arp_maxtries; 7411541Srgrimes if (la->la_hold) { 74284931Sfjoe (*ifp->if_output)(ifp, la->la_hold, 7431541Srgrimes rt_key(rt), rt); 7441541Srgrimes la->la_hold = 0; 7451541Srgrimes } 7461541Srgrimes } 7471541Srgrimesreply: 7481541Srgrimes if (op != ARPOP_REQUEST) { 7491541Srgrimes m_freem(m); 7501541Srgrimes return; 7511541Srgrimes } 7521541Srgrimes if (itaddr.s_addr == myaddr.s_addr) { 7531541Srgrimes /* I am the target */ 75484931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 75584931Sfjoe (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); 7561541Srgrimes } else { 7571541Srgrimes la = arplookup(itaddr.s_addr, 0, SIN_PROXY); 7583282Swollman if (la == NULL) { 7593282Swollman struct sockaddr_in sin; 7603282Swollman 76112693Sphk if (!arp_proxyall) { 76212693Sphk m_freem(m); 76312693Sphk return; 76412693Sphk } 7653282Swollman 7663282Swollman bzero(&sin, sizeof sin); 7673282Swollman sin.sin_family = AF_INET; 7683282Swollman sin.sin_len = sizeof sin; 7693282Swollman sin.sin_addr = itaddr; 7703282Swollman 7715101Swollman rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 77212693Sphk if (!rt) { 77312693Sphk m_freem(m); 77412693Sphk return; 77512693Sphk } 7763282Swollman /* 7773282Swollman * Don't send proxies for nodes on the same interface 7783282Swollman * as this one came out of, or we'll get into a fight 7793282Swollman * over who claims what Ether address. 7803282Swollman */ 78184931Sfjoe if (rt->rt_ifp == ifp) { 7823282Swollman rtfree(rt); 78312693Sphk m_freem(m); 78412693Sphk return; 7853282Swollman } 78684931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 78784931Sfjoe (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); 7883282Swollman rtfree(rt); 78963080Sdwmalone 79063080Sdwmalone /* 79163080Sdwmalone * Also check that the node which sent the ARP packet 79263080Sdwmalone * is on the the interface we expect it to be on. This 79363080Sdwmalone * avoids ARP chaos if an interface is connected to the 79463080Sdwmalone * wrong network. 79563080Sdwmalone */ 79663080Sdwmalone sin.sin_addr = isaddr; 79763080Sdwmalone 79863080Sdwmalone rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); 79963080Sdwmalone if (!rt) { 80063080Sdwmalone m_freem(m); 80163080Sdwmalone return; 80263080Sdwmalone } 80384931Sfjoe if (rt->rt_ifp != ifp) { 80463080Sdwmalone log(LOG_INFO, "arp_proxy: ignoring request" 80563080Sdwmalone " from %s via %s%d, expecting %s%d\n", 80684931Sfjoe inet_ntoa(isaddr), ifp->if_name, 80784931Sfjoe ifp->if_unit, rt->rt_ifp->if_name, 80863080Sdwmalone rt->rt_ifp->if_unit); 80963080Sdwmalone rtfree(rt); 81063080Sdwmalone m_freem(m); 81163080Sdwmalone return; 81263080Sdwmalone } 81363080Sdwmalone rtfree(rt); 81463080Sdwmalone 8154069Swollman#ifdef DEBUG_PROXY 8168876Srgrimes printf("arp: proxying for %s\n", 8177088Swollman inet_ntoa(itaddr)); 8184069Swollman#endif 8193282Swollman } else { 8203282Swollman rt = la->la_rt; 82184931Sfjoe (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); 8223282Swollman sdl = SDL(rt->rt_gateway); 82384931Sfjoe (void)memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln); 8243282Swollman } 8251541Srgrimes } 8261541Srgrimes 82784931Sfjoe (void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); 82884931Sfjoe (void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln); 82984931Sfjoe ah->ar_op = htons(ARPOP_REPLY); 83084931Sfjoe ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ 83184931Sfjoe switch (ifp->if_type) { 83284931Sfjoe case IFT_ARCNET: 83384931Sfjoe arh = (struct arc_header *)sa.sa_data; 83484931Sfjoe arh->arc_dhost = *ar_tha(ah); 83584931Sfjoe arh->arc_type = ARCTYPE_ARP; 83684931Sfjoe break; 83784931Sfjoe 83845705Seivind case IFT_ISO88025: 83944627Sjulian /* Re-arrange the source/dest address */ 84051320Slile memcpy(th->iso88025_dhost, th->iso88025_shost, 84151320Slile sizeof(th->iso88025_dhost)); 84284931Sfjoe memcpy(th->iso88025_shost, IF_LLADDR(ifp), 84351320Slile sizeof(th->iso88025_shost)); 84444627Sjulian /* Set the source routing bit if neccesary */ 84558313Slile if (th->iso88025_dhost[0] & TR_RII) { 84658313Slile th->iso88025_dhost[0] &= ~TR_RII; 84758313Slile if (TR_RCF_RIFLEN(th->rcf) > 2) 84858313Slile th->iso88025_shost[0] |= TR_RII; 84944627Sjulian } 85044627Sjulian /* Copy the addresses, ac and fc into sa_data */ 85151320Slile memcpy(sa.sa_data, th->iso88025_dhost, 85251320Slile sizeof(th->iso88025_dhost) * 2); 85358313Slile sa.sa_data[(sizeof(th->iso88025_dhost) * 2)] = TR_AC; 85458313Slile sa.sa_data[(sizeof(th->iso88025_dhost) * 2) + 1] = TR_LLC_FRAME; 85544627Sjulian break; 85645705Seivind case IFT_ETHER: 85751320Slile case IFT_FDDI: 85851320Slile /* 85951320Slile * May not be correct for types not explictly 86051320Slile * listed, but it is our best guess. 86151320Slile */ 86251320Slile default: 86344627Sjulian eh = (struct ether_header *)sa.sa_data; 86484931Sfjoe (void)memcpy(eh->ether_dhost, ar_tha(ah), 86551320Slile sizeof(eh->ether_dhost)); 86644627Sjulian eh->ether_type = htons(ETHERTYPE_ARP); 86744627Sjulian break; 86844627Sjulian } 8691541Srgrimes sa.sa_family = AF_UNSPEC; 8701541Srgrimes sa.sa_len = sizeof(sa); 87184931Sfjoe (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); 8721541Srgrimes return; 8731541Srgrimes} 87432350Seivind#endif 8751541Srgrimes 8761541Srgrimes/* 8771541Srgrimes * Free an arp entry. 8781541Srgrimes */ 8791541Srgrimesstatic void 8801541Srgrimesarptfree(la) 8811541Srgrimes register struct llinfo_arp *la; 8821541Srgrimes{ 8831541Srgrimes register struct rtentry *rt = la->la_rt; 8841541Srgrimes register struct sockaddr_dl *sdl; 8851541Srgrimes if (rt == 0) 8861541Srgrimes panic("arptfree"); 8871541Srgrimes if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) && 8881541Srgrimes sdl->sdl_family == AF_LINK) { 8891541Srgrimes sdl->sdl_alen = 0; 890110308Sorion la->la_preempt = la->la_asked = 0; 8911541Srgrimes rt->rt_flags &= ~RTF_REJECT; 8921541Srgrimes return; 8931541Srgrimes } 8941541Srgrimes rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt), 8951541Srgrimes 0, (struct rtentry **)0); 8961541Srgrimes} 8971541Srgrimes/* 8981541Srgrimes * Lookup or enter a new address in arptab. 8991541Srgrimes */ 9001541Srgrimesstatic struct llinfo_arp * 9011541Srgrimesarplookup(addr, create, proxy) 9021541Srgrimes u_long addr; 9031541Srgrimes int create, proxy; 9041541Srgrimes{ 9051541Srgrimes register struct rtentry *rt; 9061541Srgrimes static struct sockaddr_inarp sin = {sizeof(sin), AF_INET }; 9074069Swollman const char *why = 0; 9081541Srgrimes 9091541Srgrimes sin.sin_addr.s_addr = addr; 9101541Srgrimes sin.sin_other = proxy ? SIN_PROXY : 0; 9115101Swollman rt = rtalloc1((struct sockaddr *)&sin, create, 0UL); 9121541Srgrimes if (rt == 0) 9131541Srgrimes return (0); 9141541Srgrimes rt->rt_refcnt--; 9154069Swollman 91612693Sphk if (rt->rt_flags & RTF_GATEWAY) 9174069Swollman why = "host is not on local network"; 91812693Sphk else if ((rt->rt_flags & RTF_LLINFO) == 0) 9194069Swollman why = "could not allocate llinfo"; 92012693Sphk else if (rt->rt_gateway->sa_family != AF_LINK) 9214069Swollman why = "gateway route is not ours"; 9224069Swollman 923120383Sbms if (why) { 924120383Sbms if (create) 925120383Sbms log(LOG_DEBUG, "arplookup %s failed: %s\n", 926120383Sbms inet_ntoa(sin.sin_addr), why); 927120383Sbms 928120383Sbms /* If there are no references to this route, purge it */ 929120418Sbms if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_WASCLONED)) { 930120383Sbms rtrequest(RTM_DELETE, 931120383Sbms (struct sockaddr *)rt_key(rt), 932120383Sbms rt->rt_gateway, rt_mask(rt), 933120383Sbms rt->rt_flags, 0); 934120383Sbms } 935120383Sbms return (0); 9361541Srgrimes } 9371541Srgrimes return ((struct llinfo_arp *)rt->rt_llinfo); 9381541Srgrimes} 9391541Srgrimes 9405195Swollmanvoid 94184931Sfjoearp_ifinit(ifp, ifa) 94284931Sfjoe struct ifnet *ifp; 9435195Swollman struct ifaddr *ifa; 9445195Swollman{ 94525822Stegge if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) 94684931Sfjoe arprequest(ifp, &IA_SIN(ifa)->sin_addr, 94784931Sfjoe &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp)); 9485195Swollman ifa->ifa_rtrequest = arp_rtrequest; 9495195Swollman ifa->ifa_flags |= RTF_CLONING; 9505195Swollman} 95169152Sjlemon 95269152Sjlemonstatic void 95369152Sjlemonarp_init(void) 95469152Sjlemon{ 95569152Sjlemon 95669152Sjlemon arpintrq.ifq_maxlen = 50; 95793818Sjhb mtx_init(&arpintrq.ifq_mtx, "arp_inq", NULL, MTX_DEF); 95898459Speter LIST_INIT(&llinfo_arp); 959111888Sjlemon netisr_register(NETISR_ARP, arpintr, &arpintrq); 96069152Sjlemon} 96169152Sjlemon 96269152SjlemonSYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0); 963