X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/a3d08fcd5120d2aa8303b6349ca8b14e3f284af3..91447636331957f3d9b5ca5b508f07c526b0074d:/bsd/netinet/if_ether.c diff --git a/bsd/netinet/if_ether.c b/bsd/netinet/if_ether.c deleted file mode 100644 index 499057940..000000000 --- a/bsd/netinet/if_ether.c +++ /dev/null @@ -1,923 +0,0 @@ -/* - * Copyright (c) 2000 Apple Computer, Inc. All rights reserved. - * - * @APPLE_LICENSE_HEADER_START@ - * - * The contents of this file constitute Original Code as defined in and - * are subject to the Apple Public Source License Version 1.1 (the - * "License"). You may not use this file except in compliance with the - * License. Please obtain a copy of the License at - * http://www.apple.com/publicsource and read it before using this file. - * - * This Original Code and all software distributed under the License are - * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER - * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, - * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, - * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the - * License for the specific language governing rights and limitations - * under the License. - * - * @APPLE_LICENSE_HEADER_END@ - */ -/* - * 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: src/sys/netinet/if_ether.c,v 1.64.2.11 2001/07/25 17:27:56 jlemon Exp $ - */ - -/* - * Ethernet address resolution protocol. - * TODO: - * add "inuse/lock" bit (or ref. count) along with valid bit - */ - -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include -#include -#if BRIDGE -#include -#include -#endif - -#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 */ - -/* Apple Hardware SUM16 checksuming */ -int apple_hwcksum_tx = 1; -int apple_hwcksum_rx = 1; - -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, ""); -SYSCTL_INT(_net_link_ether_inet, OID_AUTO, apple_hwcksum_tx, CTLFLAG_RW, - &apple_hwcksum_tx, 0, ""); -SYSCTL_INT(_net_link_ether_inet, OID_AUTO, apple_hwcksum_rx, CTLFLAG_RW, - &apple_hwcksum_rx, 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 = {0, 0, 0, 50}; -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; -static int arp_init_called = 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, ""); - -void arp_rtrequest __P((int, struct rtentry *, struct sockaddr *)); -static void arprequest __P((struct arpcom *, - struct in_addr *, struct in_addr *, u_char *)); -void arpintr __P((void)); -static void arptfree __P((struct llinfo_arp *)); -static void arptimer __P((void *)); -static u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; -static struct llinfo_arp - *arplookup __P((u_long, int, int)); -#if 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; -{ -#ifdef __APPLE__ - boolean_t funnel_state = thread_funnel_set(network_flock, TRUE); -#endif - int s = splnet(); - register struct llinfo_arp *la = llinfo_arp.lh_first; - struct llinfo_arp *ola; - - timeout(arptimer, (caddr_t)0, arpt_prune * hz); - while ((ola = la) != 0) { - register struct rtentry *rt = la->la_rt; - la = la->la_le.le_next; - if (rt->rt_expire && rt->rt_expire <= time_second) - arptfree(ola); /* timer has expired, clear */ - } - splx(s); -#ifdef __APPLE__ - (void) thread_funnel_set(network_flock, FALSE); -#endif -} - -/* - * Parallel to llc_rtrequest. - */ -void -arp_rtrequest(req, rt, sa) - int req; - register struct rtentry *rt; - struct sockaddr *sa; -{ - 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); -#ifndef __APPLE__ - register_netisr(NETISR_ARP, arpintr); -#endif - } - 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((struct arpcom *)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); - -#if 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))) { - 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)), etherbroadcastaddr, 6); - SDL(gate)->sdl_alen = 6; - rt->rt_expire = time_second; - } -#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(((struct arpcom *)rt->rt_ifp)->ac_enaddr, - LLADDR(SDL(gate)), SDL(gate)->sdl_alen = 6); - 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 packet, asking who has addr on interface ac. - */ -void -arpwhohas(ac, addr) - struct arpcom *ac; - struct in_addr *addr; -{ - struct ifnet *ifp = (struct ifnet *)ac; - struct ifaddr *ifa = TAILQ_FIRST(&ifp->if_addrhead); - - while (ifa) { - if (ifa->ifa_addr->sa_family == AF_INET) { - arprequest(ac, &SIN(ifa->ifa_addr)->sin_addr, addr, ac->ac_enaddr); - return; - } - ifa = TAILQ_NEXT(ifa, ifa_link); - } - return; /* XXX */ -} - -/* - * Broadcast an ARP request. Caller specifies: - * - arp header source ip address - * - arp header target ip address - * - arp header source ethernet address - */ -static void -arprequest(ac, sip, tip, enaddr) - register struct arpcom *ac; - register struct in_addr *sip, *tip; - register u_char *enaddr; -{ - register struct mbuf *m; - register struct ether_header *eh; - register struct ether_arp *ea; - struct sockaddr sa; - static u_char llcx[] = { 0x82, 0x40, LLC_SNAP_LSAP, LLC_SNAP_LSAP, - LLC_UI, 0x00, 0x00, 0x00, 0x08, 0x06 }; - - if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL) - return; - m->m_pkthdr.rcvif = (struct ifnet *)0; - switch (ac->ac_if.if_type) { - case IFT_ISO88025: - m->m_len = sizeof(*ea) + sizeof(llcx); - m->m_pkthdr.len = sizeof(*ea) + sizeof(llcx); - MH_ALIGN(m, sizeof(*ea) + sizeof(llcx)); - (void)memcpy(mtod(m, caddr_t), llcx, sizeof(llcx)); - (void)memcpy(sa.sa_data, etherbroadcastaddr, 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; - ea = (struct ether_arp *)(mtod(m, char *) + sizeof(llcx)); - bzero((caddr_t)ea, sizeof (*ea)); - ea->arp_hrd = htons(ARPHRD_IEEE802); - break; - case IFT_FDDI: - case IFT_ETHER: - /* - * This may not be correct for types not explicitly - * listed, but this is our best guess - */ - default: - m->m_len = sizeof(*ea); - m->m_pkthdr.len = sizeof(*ea); - MH_ALIGN(m, sizeof(*ea)); - ea = mtod(m, struct ether_arp *); - eh = (struct ether_header *)sa.sa_data; - bzero((caddr_t)ea, sizeof (*ea)); - /* if_output will not swap */ - eh->ether_type = htons(ETHERTYPE_ARP); - (void)memcpy(eh->ether_dhost, etherbroadcastaddr, - sizeof(eh->ether_dhost)); - ea->arp_hrd = htons(ARPHRD_ETHER); - break; - } - ea->arp_pro = htons(ETHERTYPE_IP); - ea->arp_hln = sizeof(ea->arp_sha); /* hardware address length */ - ea->arp_pln = sizeof(ea->arp_spa); /* protocol address length */ - ea->arp_op = htons(ARPOP_REQUEST); - (void)memcpy(ea->arp_sha, enaddr, sizeof(ea->arp_sha)); - (void)memcpy(ea->arp_spa, sip, sizeof(ea->arp_spa)); - (void)memcpy(ea->arp_tpa, tip, sizeof(ea->arp_tpa)); - sa.sa_family = AF_UNSPEC; - sa.sa_len = sizeof(sa); - dlil_output(ifptodlt(((struct ifnet *)ac), PF_INET), m, 0, &sa, 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(ac, rt, m, dst, desten, rt0) - register struct arpcom *ac; - 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, etherbroadcastaddr, sizeof(etherbroadcastaddr)); - return (1); - } - if (m->m_flags & M_MCAST) { /* 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 (ac->ac_if.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(ac, - &SIN(rt->rt_ifa->ifa_addr)->sin_addr, - &SIN(dst)->sin_addr, ac->ac_enaddr); - 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. - */ -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) { - 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 < sizeof(struct arphdr) + 2 * ar->ar_hln - + 2 * ar->ar_pln) { - 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); - } -} - -#if 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 = 0; - -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"); - -static void -in_arpinput(m) - struct mbuf *m; -{ - register struct ether_arp *ea; - register struct arpcom *ac = (struct arpcom *)m->m_pkthdr.rcvif; - struct ether_header *eh; - struct iso88025_header *th = (struct iso88025_header *)0; - register struct llinfo_arp *la = 0; - register struct rtentry *rt; - struct in_ifaddr *ia, *maybe_ia = 0; - struct sockaddr_dl *sdl; - struct sockaddr sa; - struct in_addr isaddr, itaddr, myaddr; - int op, rif_len; - unsigned char buf[18]; - unsigned char buf2[18]; - - if (m->m_len < sizeof(struct ether_arp) && - (m = m_pullup(m, sizeof(struct ether_arp))) == NULL) { - log(LOG_ERR, "in_arp: runt packet -- m_pullup failed\n"); - return; - } - - ea = mtod(m, struct ether_arp *); - op = ntohs(ea->arp_op); - (void)memcpy(&isaddr, ea->arp_spa, sizeof (isaddr)); - (void)memcpy(&itaddr, ea->arp_tpa, sizeof (itaddr)); - -#if __APPLE__ - /* Don't respond to requests for 0.0.0.0 */ - if (itaddr.s_addr == 0 && op == ARPOP_REQUEST) { - m_freem(m); - return; - } -#endif - - for (ia = in_ifaddrhead.tqh_first; ia; ia = ia->ia_link.tqe_next) { - /* - * For a bridge, we want to check the address irrespective - * of the receive interface. (This will change slightly - * when we have clusters of interfaces). - */ -#if BRIDGE -#define BRIDGE_TEST (do_bridge) -#else -#define BRIDGE_TEST (0) /* cc will optimise the test away */ -#endif - if ((BRIDGE_TEST) || (ia->ia_ifp == &ac->ac_if)) { - maybe_ia = ia; - if ((itaddr.s_addr == ia->ia_addr.sin_addr.s_addr) || - (isaddr.s_addr == ia->ia_addr.sin_addr.s_addr)) { - break; - } - } - } - if (maybe_ia == 0) { - m_freem(m); - return; - } - myaddr = ia ? ia->ia_addr.sin_addr : maybe_ia->ia_addr.sin_addr; - if (!bcmp((caddr_t)ea->arp_sha, (caddr_t)ac->ac_enaddr, - sizeof (ea->arp_sha))) { - m_freem(m); /* it's from me, ignore it. */ - return; - } - if (!bcmp((caddr_t)ea->arp_sha, (caddr_t)etherbroadcastaddr, - sizeof (ea->arp_sha))) { - log(LOG_ERR, - "arp: ether address is broadcast for IP address %s!\n", - inet_ntoa(isaddr)); - m_freem(m); - return; - } - if (isaddr.s_addr == myaddr.s_addr) { - struct kev_msg ev_msg; - struct kev_in_collision *in_collision; - u_char storage[sizeof(struct kev_in_collision) + 6]; - in_collision = (struct kev_in_collision*)storage; - - log(LOG_ERR, - "duplicate IP address %s sent from ethernet address %s\n", - inet_ntoa(isaddr), ether_sprintf(buf, ea->arp_sha)); - - /* Send a kernel event so anyone can learn of the conflict */ - in_collision->link_data.if_family = ac->ac_if.if_family; - in_collision->link_data.if_unit = ac->ac_if.if_unit; - strncpy(&in_collision->link_data.if_name[0], ac->ac_if.if_name, IFNAMSIZ); - in_collision->ia_ipaddr = isaddr; - in_collision->hw_len = ETHER_ADDR_LEN; - bcopy((caddr_t)ea->arp_sha, (caddr_t)in_collision->hw_addr, sizeof(ea->arp_sha)); - ev_msg.vendor_code = KEV_VENDOR_APPLE; - ev_msg.kev_class = KEV_NETWORK_CLASS; - ev_msg.kev_subclass = KEV_INET_SUBCLASS; - ev_msg.event_code = KEV_INET_ARPCOLLISION; - ev_msg.dv[0].data_ptr = in_collision; - ev_msg.dv[0].data_length = sizeof(struct kev_in_collision) + 6; - ev_msg.dv[1].data_length = 0; - kev_post_msg(&ev_msg); - - 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 != &ac->ac_if) { - if (log_arp_wrong_iface) - log(LOG_ERR, "arp: %s is on %s%d but got reply from %s on %s%d\n", - inet_ntoa(isaddr), - rt->rt_ifp->if_name, rt->rt_ifp->if_unit, - ether_sprintf(buf, ea->arp_sha), - ac->ac_if.if_name, ac->ac_if.if_unit); - goto reply; - } - if (sdl->sdl_alen && - bcmp((caddr_t)ea->arp_sha, LLADDR(sdl), sdl->sdl_alen)) { - if (rt->rt_expire) - log(LOG_INFO, "arp: %s moved from %s to %s on %s%d\n", - inet_ntoa(isaddr), - ether_sprintf(buf, (u_char *)LLADDR(sdl)), - ether_sprintf(buf2, ea->arp_sha), - ac->ac_if.if_name, ac->ac_if.if_unit); - else { - log(LOG_ERR, - "arp: %s attempts to modify permanent entry for %s on %s%d", - ether_sprintf(buf, ea->arp_sha), inet_ntoa(isaddr), - ac->ac_if.if_name, ac->ac_if.if_unit); - goto reply; - } - } - (void)memcpy(LLADDR(sdl), ea->arp_sha, sizeof(ea->arp_sha)); - sdl->sdl_alen = sizeof(ea->arp_sha); -#ifndef __APPLE__ - /* TokenRing */ - 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 (ac->ac_if.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; - } -#endif - if (rt->rt_expire) - rt->rt_expire = time_second + arpt_keep; - rt->rt_flags &= ~RTF_REJECT; - la->la_asked = 0; - if (la->la_hold) { - dlil_output(((struct ifnet *)ac)->if_data.default_proto, la->la_hold, rt, - rt_key(rt), 0); - 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(ea->arp_tha, ea->arp_sha, sizeof(ea->arp_sha)); - (void)memcpy(ea->arp_sha, ac->ac_enaddr, sizeof(ea->arp_sha)); - } 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 == &ac->ac_if) { - rtfree(rt); - m_freem(m); - return; - } - (void)memcpy(ea->arp_tha, ea->arp_sha, sizeof(ea->arp_sha)); - (void)memcpy(ea->arp_sha, ac->ac_enaddr, sizeof(ea->arp_sha)); - rtfree(rt); -#if DEBUG_PROXY - printf("arp: proxying for %s\n", - inet_ntoa(itaddr)); -#endif - } else { - rt = la->la_rt; - (void)memcpy(ea->arp_tha, ea->arp_sha, sizeof(ea->arp_sha)); - sdl = SDL(rt->rt_gateway); - (void)memcpy(ea->arp_sha, LLADDR(sdl), sizeof(ea->arp_sha)); - } - } - - (void)memcpy(ea->arp_tpa, ea->arp_spa, sizeof(ea->arp_spa)); - (void)memcpy(ea->arp_spa, &itaddr, sizeof(ea->arp_spa)); - ea->arp_op = htons(ARPOP_REPLY); - ea->arp_pro = htons(ETHERTYPE_IP); /* let's be sure! */ - switch (ac->ac_if.if_type) { - case IFT_ISO88025: - /* Re-arrange the source/dest address */ - memcpy(th->iso88025_dhost, th->iso88025_shost, - sizeof(th->iso88025_dhost)); - memcpy(th->iso88025_shost, ac->ac_enaddr, - 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; -#ifdef __APPLE__ - if (IN_LINKLOCAL(ntohl(*((u_int32_t*)ea->arp_spa)))) - (void)memcpy(eh->ether_dhost, etherbroadcastaddr, sizeof(eh->ether_dhost)); - else -#endif - (void)memcpy(eh->ether_dhost, ea->arp_tha, sizeof(eh->ether_dhost)); - eh->ether_type = htons(ETHERTYPE_ARP); - break; - } - sa.sa_family = AF_UNSPEC; - sa.sa_len = sizeof(sa); - dlil_output(((struct ifnet *)ac)->if_data.default_proto, m, 0, &sa, 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); - rtunref(rt); - - if (rt->rt_flags & RTF_GATEWAY) { - why = "host is not on local network"; - - /* If there are no references to this route, purge it */ - if (rt->rt_refcnt <= 0 && (rt->rt_flags & RTF_WASCLONED) != 0) { - rtrequest(RTM_DELETE, - (struct sockaddr *)rt_key(rt), - rt->rt_gateway, rt_mask(rt), - rt->rt_flags, 0); - } - } - 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(ac, ifa) - struct arpcom *ac; - struct ifaddr *ifa; -{ - if (ntohl(IA_SIN(ifa)->sin_addr.s_addr) != INADDR_ANY) - arprequest(ac, &IA_SIN(ifa)->sin_addr, - &IA_SIN(ifa)->sin_addr, ac->ac_enaddr); - ifa->ifa_rtrequest = arp_rtrequest; - ifa->ifa_flags |= RTF_CLONING; -}