/* * Copyright (c) 1982, 1986, 1988, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)if_ether.c 8.1 (Berkeley) 6/10/93 * $FreeBSD$ */ /* * Ethernet address resolution protocol. * TODO: * add "inuse/lock" bit (or ref. count) along with valid bit */ #include "opt_inet.h" #include "opt_bdg.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef BRIDGE #include #include #endif #include #include #include #include #include #define SIN(s) ((struct sockaddr_in *)s) #define SDL(s) ((struct sockaddr_dl *)s) SYSCTL_DECL(_net_link_ether); SYSCTL_NODE(_net_link_ether, PF_INET, inet, CTLFLAG_RW, 0, ""); /* timer values */ static int arpt_prune = (5*60*1); /* walk list every 5 minutes */ static int arpt_keep = (20*60); /* once resolved, good for 20 more minutes */ static int arpt_down = 20; /* once declared down, don't send for 20 sec */ SYSCTL_INT(_net_link_ether_inet, OID_AUTO, prune_intvl, CTLFLAG_RW, &arpt_prune, 0, ""); SYSCTL_INT(_net_link_ether_inet, OID_AUTO, max_age, CTLFLAG_RW, &arpt_keep, 0, ""); SYSCTL_INT(_net_link_ether_inet, OID_AUTO, host_down_time, CTLFLAG_RW, &arpt_down, 0, ""); #define rt_expire rt_rmx.rmx_expire struct llinfo_arp { LIST_ENTRY(llinfo_arp) la_le; struct rtentry *la_rt; struct mbuf *la_hold; /* last packet until resolved/timeout */ long la_asked; /* last time we QUERIED for this addr */ #define la_timer la_rt->rt_rmx.rmx_expire /* deletion time in seconds */ }; static LIST_HEAD(, llinfo_arp) llinfo_arp; struct ifqueue arpintrq; static int arp_inuse, arp_allocated; static int arp_maxtries = 5; static int useloopback = 1; /* use loopback interface for local traffic */ static int arp_proxyall = 0; SYSCTL_INT(_net_link_ether_inet, OID_AUTO, maxtries, CTLFLAG_RW, &arp_maxtries, 0, ""); SYSCTL_INT(_net_link_ether_inet, OID_AUTO, useloopback, CTLFLAG_RW, &useloopback, 0, ""); SYSCTL_INT(_net_link_ether_inet, OID_AUTO, proxyall, CTLFLAG_RW, &arp_proxyall, 0, ""); static void arp_init __P((void)); static void arp_rtrequest __P((int, struct rtentry *, struct rt_addrinfo *)); static void arprequest __P((struct ifnet *, struct in_addr *, struct in_addr *, u_char *)); static void arpintr __P((void)); static void arptfree __P((struct llinfo_arp *)); static void arptimer __P((void *)); static struct llinfo_arp *arplookup __P((u_long, int, int)); #ifdef INET static void in_arpinput __P((struct mbuf *)); #endif /* * Timeout routine. Age arp_tab entries periodically. */ /* ARGSUSED */ static void arptimer(ignored_arg) void *ignored_arg; { int s = splnet(); register struct llinfo_arp *la = LIST_FIRST(&llinfo_arp); struct llinfo_arp *ola; timeout(arptimer, (caddr_t)0, arpt_prune * hz); while ((ola = la) != 0) { register struct rtentry *rt = la->la_rt; la = LIST_NEXT(la, la_le); if (rt->rt_expire && rt->rt_expire <= time_second) arptfree(ola); /* timer has expired, clear */ } splx(s); } /* * Parallel to llc_rtrequest. */ static void arp_rtrequest(req, rt, info) int req; register struct rtentry *rt; struct rt_addrinfo *info; { register struct sockaddr *gate = rt->rt_gateway; register struct llinfo_arp *la = (struct llinfo_arp *)rt->rt_llinfo; static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK}; static int arpinit_done; if (!arpinit_done) { arpinit_done = 1; LIST_INIT(&llinfo_arp); timeout(arptimer, (caddr_t)0, hz); register_netisr(NETISR_ARP, arpintr); } if (rt->rt_flags & RTF_GATEWAY) return; switch (req) { case RTM_ADD: /* * XXX: If this is a manually added route to interface * such as older version of routed or gated might provide, * restore cloning bit. */ if ((rt->rt_flags & RTF_HOST) == 0 && SIN(rt_mask(rt))->sin_addr.s_addr != 0xffffffff) rt->rt_flags |= RTF_CLONING; if (rt->rt_flags & RTF_CLONING) { /* * Case 1: This route should come from a route to iface. */ rt_setgate(rt, rt_key(rt), (struct sockaddr *)&null_sdl); gate = rt->rt_gateway; SDL(gate)->sdl_type = rt->rt_ifp->if_type; SDL(gate)->sdl_index = rt->rt_ifp->if_index; rt->rt_expire = time_second; break; } /* Announce a new entry if requested. */ if (rt->rt_flags & RTF_ANNOUNCE) arprequest(rt->rt_ifp, &SIN(rt_key(rt))->sin_addr, &SIN(rt_key(rt))->sin_addr, (u_char *)LLADDR(SDL(gate))); /*FALLTHROUGH*/ case RTM_RESOLVE: if (gate->sa_family != AF_LINK || gate->sa_len < sizeof(null_sdl)) { log(LOG_DEBUG, "arp_rtrequest: bad gateway value\n"); break; } SDL(gate)->sdl_type = rt->rt_ifp->if_type; SDL(gate)->sdl_index = rt->rt_ifp->if_index; if (la != 0) break; /* This happens on a route change */ /* * Case 2: This route may come from cloning, or a manual route * add with a LL address. */ R_Malloc(la, struct llinfo_arp *, sizeof(*la)); rt->rt_llinfo = (caddr_t)la; if (la == 0) { log(LOG_DEBUG, "arp_rtrequest: malloc failed\n"); break; } arp_inuse++, arp_allocated++; Bzero(la, sizeof(*la)); la->la_rt = rt; rt->rt_flags |= RTF_LLINFO; LIST_INSERT_HEAD(&llinfo_arp, la, la_le); #ifdef INET /* * This keeps the multicast addresses from showing up * in `arp -a' listings as unresolved. It's not actually * functional. Then the same for broadcast. */ if (IN_MULTICAST(ntohl(SIN(rt_key(rt))->sin_addr.s_addr)) && rt->rt_ifp->if_type != IFT_ARCNET) { ETHER_MAP_IP_MULTICAST(&SIN(rt_key(rt))->sin_addr, LLADDR(SDL(gate))); SDL(gate)->sdl_alen = 6; rt->rt_expire = 0; } if (in_broadcast(SIN(rt_key(rt))->sin_addr, rt->rt_ifp)) { memcpy(LLADDR(SDL(gate)), rt->rt_ifp->if_broadcastaddr, rt->rt_ifp->if_addrlen); SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen; rt->rt_expire = 0; } #endif if (SIN(rt_key(rt))->sin_addr.s_addr == (IA_SIN(rt->rt_ifa))->sin_addr.s_addr) { /* * This test used to be * if (loif.if_flags & IFF_UP) * It allowed local traffic to be forced * through the hardware by configuring the loopback down. * However, it causes problems during network configuration * for boards that can't receive packets they send. * It is now necessary to clear "useloopback" and remove * the route to force traffic out to the hardware. */ rt->rt_expire = 0; Bcopy(IF_LLADDR(rt->rt_ifp), LLADDR(SDL(gate)), SDL(gate)->sdl_alen = rt->rt_ifp->if_addrlen); if (useloopback) rt->rt_ifp = loif; } break; case RTM_DELETE: if (la == 0) break; arp_inuse--; LIST_REMOVE(la, la_le); rt->rt_llinfo = 0; rt->rt_flags &= ~RTF_LLINFO; if (la->la_hold) m_freem(la->la_hold); Free((caddr_t)la); } } /* * Broadcast an ARP request. Caller specifies: * - arp header source ip address * - arp header target ip address * - arp header source ethernet address */ static void arprequest(ifp, sip, tip, enaddr) register struct ifnet *ifp; register struct in_addr *sip, *tip; register u_char *enaddr; { register struct mbuf *m; register struct ether_header *eh; register struct arc_header *arh; register struct arphdr *ah; struct sockaddr sa; static u_char llcx[] = { 0x82, 0x40, LLC_SNAP_LSAP, LLC_SNAP_LSAP, LLC_UI, 0x00, 0x00, 0x00, 0x08, 0x06 }; u_short ar_hrd; if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) return; m->m_pkthdr.rcvif = (struct ifnet *)0; switch (ifp->if_type) { case IFT_ARCNET: ar_hrd = htons(ARPHRD_ARCNET); m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); m->m_pkthdr.len = m->m_len; MH_ALIGN(m, m->m_len); arh = (struct arc_header *)sa.sa_data; arh->arc_dhost = *ifp->if_broadcastaddr; arh->arc_type = ARCTYPE_ARP; ah = mtod(m, struct arphdr *); break; case IFT_ISO88025: ar_hrd = htons(ARPHRD_IEEE802); m->m_len = sizeof(llcx) + arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); m->m_pkthdr.len = m->m_len; MH_ALIGN(m, m->m_len); (void)memcpy(mtod(m, caddr_t), llcx, sizeof(llcx)); (void)memcpy(sa.sa_data, ifp->if_broadcastaddr, 6); (void)memcpy(sa.sa_data + 6, enaddr, 6); sa.sa_data[6] |= TR_RII; sa.sa_data[12] = TR_AC; sa.sa_data[13] = TR_LLC_FRAME; ah = (struct arphdr *)(mtod(m, char *) + sizeof(llcx)); break; case IFT_FDDI: case IFT_ETHER: /* * This may not be correct for types not explicitly * listed, but this is our best guess */ default: ar_hrd = htons(ARPHRD_ETHER); m->m_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); m->m_pkthdr.len = m->m_len; MH_ALIGN(m, m->m_len); eh = (struct ether_header *)sa.sa_data; /* if_output will not swap */ eh->ether_type = htons(ETHERTYPE_ARP); (void)memcpy(eh->ether_dhost, ifp->if_broadcastaddr, sizeof(eh->ether_dhost)); ah = mtod(m, struct arphdr *); break; } ah->ar_hrd = ar_hrd; ah->ar_pro = htons(ETHERTYPE_IP); ah->ar_hln = ifp->if_addrlen; /* hardware address length */ ah->ar_pln = sizeof(struct in_addr); /* protocol address length */ ah->ar_op = htons(ARPOP_REQUEST); (void)memcpy(ar_sha(ah), enaddr, ah->ar_hln); (void)memcpy(ar_spa(ah), sip, ah->ar_pln); (void)memcpy(ar_tpa(ah), tip, ah->ar_pln); sa.sa_family = AF_UNSPEC; sa.sa_len = sizeof(sa); (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); } /* * Resolve an IP address into an ethernet address. If success, * desten is filled in. If there is no entry in arptab, * set one up and broadcast a request for the IP address. * Hold onto this mbuf and resend it once the address * is finally resolved. A return value of 1 indicates * that desten has been filled in and the packet should be sent * normally; a 0 return indicates that the packet has been * taken over here, either now or for later transmission. */ int arpresolve(ifp, rt, m, dst, desten, rt0) register struct ifnet *ifp; register struct rtentry *rt; struct mbuf *m; register struct sockaddr *dst; register u_char *desten; struct rtentry *rt0; { struct llinfo_arp *la = 0; struct sockaddr_dl *sdl; if (m->m_flags & M_BCAST) { /* broadcast */ (void)memcpy(desten, ifp->if_broadcastaddr, ifp->if_addrlen); return (1); } if (m->m_flags & M_MCAST && ifp->if_type != IFT_ARCNET) {/* multicast */ ETHER_MAP_IP_MULTICAST(&SIN(dst)->sin_addr, desten); return(1); } if (rt) la = (struct llinfo_arp *)rt->rt_llinfo; if (la == 0) { la = arplookup(SIN(dst)->sin_addr.s_addr, 1, 0); if (la) rt = la->la_rt; } if (la == 0 || rt == 0) { log(LOG_DEBUG, "arpresolve: can't allocate llinfo for %s%s%s\n", inet_ntoa(SIN(dst)->sin_addr), la ? "la" : "", rt ? "rt" : ""); m_freem(m); return (0); } sdl = SDL(rt->rt_gateway); /* * Check the address family and length is valid, the address * is resolved; otherwise, try to resolve. */ if ((rt->rt_expire == 0 || rt->rt_expire > time_second) && sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) { bcopy(LLADDR(sdl), desten, sdl->sdl_alen); return 1; } /* * If ARP is disabled on this interface, stop. * XXX * Probably should not allocate empty llinfo struct if we are * not going to be sending out an arp request. */ if (ifp->if_flags & IFF_NOARP) return (0); /* * There is an arptab entry, but no ethernet address * response yet. Replace the held mbuf with this * latest one. */ if (la->la_hold) m_freem(la->la_hold); la->la_hold = m; if (rt->rt_expire) { rt->rt_flags &= ~RTF_REJECT; if (la->la_asked == 0 || rt->rt_expire != time_second) { rt->rt_expire = time_second; if (la->la_asked++ < arp_maxtries) arprequest(ifp, &SIN(rt->rt_ifa->ifa_addr)->sin_addr, &SIN(dst)->sin_addr, IF_LLADDR(ifp)); else { rt->rt_flags |= RTF_REJECT; rt->rt_expire += arpt_down; la->la_asked = 0; } } } return (0); } /* * Common length and type checks are done here, * then the protocol-specific routine is called. */ static void arpintr() { register struct mbuf *m; register struct arphdr *ar; int s; while (arpintrq.ifq_head) { s = splimp(); IF_DEQUEUE(&arpintrq, m); splx(s); if (m == 0 || (m->m_flags & M_PKTHDR) == 0) panic("arpintr"); if (m->m_len < sizeof(struct arphdr) && ((m = m_pullup(m, sizeof(struct arphdr))) == NULL)) { log(LOG_ERR, "arp: runt packet -- m_pullup failed\n"); continue; } ar = mtod(m, struct arphdr *); if (ntohs(ar->ar_hrd) != ARPHRD_ETHER && ntohs(ar->ar_hrd) != ARPHRD_IEEE802 && ntohs(ar->ar_hrd) != ARPHRD_ARCNET) { log(LOG_ERR, "arp: unknown hardware address format (0x%2D)\n", (unsigned char *)&ar->ar_hrd, ""); m_freem(m); continue; } if (m->m_pkthdr.len < arphdr_len(ar) && (m = m_pullup(m, arphdr_len(ar))) == NULL) { log(LOG_ERR, "arp: runt packet\n"); m_freem(m); continue; } switch (ntohs(ar->ar_pro)) { #ifdef INET case ETHERTYPE_IP: in_arpinput(m); continue; #endif } m_freem(m); } } #ifdef INET /* * ARP for Internet protocols on 10 Mb/s Ethernet. * Algorithm is that given in RFC 826. * In addition, a sanity check is performed on the sender * protocol address, to catch impersonators. * We no longer handle negotiations for use of trailer protocol: * Formerly, ARP replied for protocol type ETHERTYPE_TRAIL sent * along with IP replies if we wanted trailers sent to us, * and also sent them in response to IP replies. * This allowed either end to announce the desire to receive * trailer packets. * We no longer reply to requests for ETHERTYPE_TRAIL protocol either, * but formerly didn't normally send requests. */ static int log_arp_wrong_iface = 1; static int log_arp_movements = 1; SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_wrong_iface, CTLFLAG_RW, &log_arp_wrong_iface, 0, "log arp packets arriving on the wrong interface"); SYSCTL_INT(_net_link_ether_inet, OID_AUTO, log_arp_movements, CTLFLAG_RW, &log_arp_movements, 0, "log arp replies from MACs different than the one in the cache"); static void in_arpinput(m) struct mbuf *m; { register struct arphdr *ah; register struct ifnet *ifp = m->m_pkthdr.rcvif; struct ether_header *eh; struct arc_header *arh; struct iso88025_header *th = (struct iso88025_header *)0; register struct llinfo_arp *la = 0; register struct rtentry *rt; struct ifaddr *ifa; struct in_ifaddr *ia; struct sockaddr_dl *sdl; struct sockaddr sa; struct in_addr isaddr, itaddr, myaddr; int op, rif_len; int req_len; req_len = arphdr_len2(ifp->if_addrlen, sizeof(struct in_addr)); if (m->m_len < req_len && (m = m_pullup(m, req_len)) == NULL) { log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); return; } ah = mtod(m, struct arphdr *); op = ntohs(ah->ar_op); (void)memcpy(&isaddr, ar_spa(ah), sizeof (isaddr)); (void)memcpy(&itaddr, ar_tpa(ah), sizeof (itaddr)); #ifdef BRIDGE #define BRIDGE_TEST (do_bridge) #else #define BRIDGE_TEST (0) /* cc will optimise the test away */ #endif /* * For a bridge, we want to check the address irrespective * of the receive interface. (This will change slightly * when we have clusters of interfaces). */ LIST_FOREACH(ia, INADDR_HASH(itaddr.s_addr), ia_hash) if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) && itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) goto match; LIST_FOREACH(ia, INADDR_HASH(isaddr.s_addr), ia_hash) if ((BRIDGE_TEST || (ia->ia_ifp == ifp)) && isaddr.s_addr == ia->ia_addr.sin_addr.s_addr) goto match; /* * No match, use the first inet address on the receive interface * as a dummy address for the rest of the function. */ TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) if (ifa->ifa_addr && ifa->ifa_addr->sa_family == AF_INET) { ia = ifatoia(ifa); goto match; } /* * If bridging, fall back to using any inet address. */ if (!BRIDGE_TEST || (ia = TAILQ_FIRST(&in_ifaddrhead)) == NULL) { m_freem(m); return; } match: myaddr = ia->ia_addr.sin_addr; if (!bcmp(ar_sha(ah), IF_LLADDR(ifp), ifp->if_addrlen)) { m_freem(m); /* it's from me, ignore it. */ return; } if (!bcmp(ar_sha(ah), ifp->if_broadcastaddr, ifp->if_addrlen)) { log(LOG_ERR, "arp: link address is broadcast for IP address %s!\n", inet_ntoa(isaddr)); m_freem(m); return; } if (isaddr.s_addr == myaddr.s_addr) { log(LOG_ERR, "arp: %*D is using my IP address %s!\n", ifp->if_addrlen, (u_char *)ar_sha(ah), ":", inet_ntoa(isaddr)); itaddr = myaddr; goto reply; } la = arplookup(isaddr.s_addr, itaddr.s_addr == myaddr.s_addr, 0); if (la && (rt = la->la_rt) && (sdl = SDL(rt->rt_gateway))) { /* the following is not an error when doing bridging */ if (!BRIDGE_TEST && rt->rt_ifp != ifp) { if (log_arp_wrong_iface) log(LOG_ERR, "arp: %s is on %s%d but got reply from %*D on %s%d\n", inet_ntoa(isaddr), rt->rt_ifp->if_name, rt->rt_ifp->if_unit, ifp->if_addrlen, (u_char *)ar_sha(ah), ":", ifp->if_name, ifp->if_unit); goto reply; } if (sdl->sdl_alen && bcmp(ar_sha(ah), LLADDR(sdl), sdl->sdl_alen)) { if (rt->rt_expire) { if (log_arp_movements) log(LOG_INFO, "arp: %s moved from %*D to %*D on %s%d\n", inet_ntoa(isaddr), ifp->if_addrlen, (u_char *)LLADDR(sdl), ":", ifp->if_addrlen, (u_char *)ar_sha(ah), ":", ifp->if_name, ifp->if_unit); } else { log(LOG_ERR, "arp: %*D attempts to modify permanent entry for %s on %s%d\n", ifp->if_addrlen, (u_char *)ar_sha(ah), ":", inet_ntoa(isaddr), ifp->if_name, ifp->if_unit); goto reply; } } /* * sanity check for the address length. * XXX this does not work for protocols with variable address * length. -is */ if (sdl->sdl_alen && sdl->sdl_alen != ah->ar_hln) { log(LOG_WARNING, "arp from %*D: new addr len %d, was %d", ifp->if_addrlen, (u_char *) ar_sha(ah), ":", ah->ar_hln, sdl->sdl_alen); } if (ifp->if_addrlen != ah->ar_hln) { log(LOG_WARNING, "arp from %*D: addr len: new %d, i/f %d (ignored)", ifp->if_addrlen, (u_char *) ar_sha(ah), ":", ah->ar_hln, ifp->if_addrlen); goto reply; } (void)memcpy(LLADDR(sdl), ar_sha(ah), sdl->sdl_alen = ah->ar_hln); sdl->sdl_rcf = (u_short)0; /* * If we receive an arp from a token-ring station over * a token-ring nic then try to save the source * routing info. */ if (ifp->if_type == IFT_ISO88025) { th = (struct iso88025_header *)m->m_pkthdr.header; rif_len = TR_RCF_RIFLEN(th->rcf); if ((th->iso88025_shost[0] & TR_RII) && (rif_len > 2)) { sdl->sdl_rcf = th->rcf; sdl->sdl_rcf ^= htons(TR_RCF_DIR); memcpy(sdl->sdl_route, th->rd, rif_len - 2); sdl->sdl_rcf &= ~htons(TR_RCF_BCST_MASK); /* * Set up source routing information for * reply packet (XXX) */ m->m_data -= rif_len; m->m_len += rif_len; m->m_pkthdr.len += rif_len; } else { th->iso88025_shost[0] &= ~TR_RII; } m->m_data -= 8; m->m_len += 8; m->m_pkthdr.len += 8; th->rcf = sdl->sdl_rcf; } else { sdl->sdl_rcf = (u_short)0; } if (rt->rt_expire) rt->rt_expire = time_second + arpt_keep; rt->rt_flags &= ~RTF_REJECT; la->la_asked = 0; if (la->la_hold) { (*ifp->if_output)(ifp, la->la_hold, rt_key(rt), rt); la->la_hold = 0; } } reply: if (op != ARPOP_REQUEST) { m_freem(m); return; } if (itaddr.s_addr == myaddr.s_addr) { /* I am the target */ (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); } else { la = arplookup(itaddr.s_addr, 0, SIN_PROXY); if (la == NULL) { struct sockaddr_in sin; if (!arp_proxyall) { m_freem(m); return; } bzero(&sin, sizeof sin); sin.sin_family = AF_INET; sin.sin_len = sizeof sin; sin.sin_addr = itaddr; rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); if (!rt) { m_freem(m); return; } /* * Don't send proxies for nodes on the same interface * as this one came out of, or we'll get into a fight * over who claims what Ether address. */ if (rt->rt_ifp == ifp) { rtfree(rt); m_freem(m); return; } (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); (void)memcpy(ar_sha(ah), IF_LLADDR(ifp), ah->ar_hln); rtfree(rt); /* * Also check that the node which sent the ARP packet * is on the the interface we expect it to be on. This * avoids ARP chaos if an interface is connected to the * wrong network. */ sin.sin_addr = isaddr; rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL); if (!rt) { m_freem(m); return; } if (rt->rt_ifp != ifp) { log(LOG_INFO, "arp_proxy: ignoring request" " from %s via %s%d, expecting %s%d\n", inet_ntoa(isaddr), ifp->if_name, ifp->if_unit, rt->rt_ifp->if_name, rt->rt_ifp->if_unit); rtfree(rt); m_freem(m); return; } rtfree(rt); #ifdef DEBUG_PROXY printf("arp: proxying for %s\n", inet_ntoa(itaddr)); #endif } else { rt = la->la_rt; (void)memcpy(ar_tha(ah), ar_sha(ah), ah->ar_hln); sdl = SDL(rt->rt_gateway); (void)memcpy(ar_sha(ah), LLADDR(sdl), ah->ar_hln); } } (void)memcpy(ar_tpa(ah), ar_spa(ah), ah->ar_pln); (void)memcpy(ar_spa(ah), &itaddr, ah->ar_pln); ah->ar_op = htons(ARPOP_REPLY); ah->ar_pro = htons(ETHERTYPE_IP); /* let's be sure! */ switch (ifp->if_type) { case IFT_ARCNET: arh = (struct arc_header *)sa.sa_data; arh->arc_dhost = *ar_tha(ah); arh->arc_type = ARCTYPE_ARP; break; case IFT_ISO88025: /* Re-arrange the source/dest address */ memcpy(th->iso88025_dhost, th->iso88025_shost, sizeof(th->iso88025_dhost)); memcpy(th->iso88025_shost, IF_LLADDR(ifp), sizeof(th->iso88025_shost)); /* Set the source routing bit if neccesary */ if (th->iso88025_dhost[0] & TR_RII) { th->iso88025_dhost[0] &= ~TR_RII; if (TR_RCF_RIFLEN(th->rcf) > 2) th->iso88025_shost[0] |= TR_RII; } /* Copy the addresses, ac and fc into sa_data */ memcpy(sa.sa_data, th->iso88025_dhost, sizeof(th->iso88025_dhost) * 2); sa.sa_data[(sizeof(th->iso88025_dhost) * 2)] = TR_AC; sa.sa_data[(sizeof(th->iso88025_dhost) * 2) + 1] = TR_LLC_FRAME; break; case IFT_ETHER: case IFT_FDDI: /* * May not be correct for types not explictly * listed, but it is our best guess. */ default: eh = (struct ether_header *)sa.sa_data; (void)memcpy(eh->ether_dhost, ar_tha(ah), sizeof(eh->ether_dhost)); eh->ether_type = htons(ETHERTYPE_ARP); break; } sa.sa_family = AF_UNSPEC; sa.sa_len = sizeof(sa); (*ifp->if_output)(ifp, m, &sa, (struct rtentry *)0); return; } #endif /* * Free an arp entry. */ static void arptfree(la) register struct llinfo_arp *la; { register struct rtentry *rt = la->la_rt; register struct sockaddr_dl *sdl; if (rt == 0) panic("arptfree"); if (rt->rt_refcnt > 0 && (sdl = SDL(rt->rt_gateway)) && sdl->sdl_family == AF_LINK) { sdl->sdl_alen = 0; la->la_asked = 0; rt->rt_flags &= ~RTF_REJECT; return; } rtrequest(RTM_DELETE, rt_key(rt), (struct sockaddr *)0, rt_mask(rt), 0, (struct rtentry **)0); } /* * Lookup or enter a new address in arptab. */ static struct llinfo_arp * arplookup(addr, create, proxy) u_long addr; int create, proxy; { register struct rtentry *rt; static struct sockaddr_inarp sin = {sizeof(sin), AF_INET }; const char *why = 0; sin.sin_addr.s_addr = addr; sin.sin_other = proxy ? SIN_PROXY : 0; rt = rtalloc1((struct sockaddr *)&sin, create, 0UL); if (rt == 0) return (0); rt->rt_refcnt--; if (rt->rt_flags & RTF_GATEWAY) why = "host is not on local network"; else if ((rt->rt_flags & RTF_LLINFO) == 0) why = "could not allocate llinfo"; else if (rt->rt_gateway->sa_family != AF_LINK) why = "gateway route is not ours"; if (why && create) { log(LOG_DEBUG, "arplookup %s failed: %s\n", inet_ntoa(sin.sin_addr), why); return 0; } else if (why) { return 0; } return ((struct llinfo_arp *)rt->rt_llinfo); } void arp_ifinit(ifp, ifa) struct ifnet *ifp; struct ifaddr *ifa; { if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) arprequest(ifp, &IA_SIN(ifa)->sin_addr, &IA_SIN(ifa)->sin_addr, IF_LLADDR(ifp)); ifa->ifa_rtrequest = arp_rtrequest; ifa->ifa_flags |= RTF_CLONING; } static void arp_init(void) { arpintrq.ifq_maxlen = 50; mtx_init(&arpintrq.ifq_mtx, "arp_inq", MTX_DEF); } SYSINIT(arp, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY, arp_init, 0);