+++ /dev/null
-/*
- * 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 <sys/param.h>
-#include <sys/kernel.h>
-#include <sys/queue.h>
-#include <sys/sysctl.h>
-#include <sys/systm.h>
-#include <sys/mbuf.h>
-#include <sys/malloc.h>
-#include <sys/socket.h>
-#include <sys/syslog.h>
-
-#include <net/if.h>
-#include <net/if_dl.h>
-#include <net/if_types.h>
-#include <net/route.h>
-#include <net/netisr.h>
-#include <net/if_llc.h>
-#if BRIDGE
-#include <net/ethernet.h>
-#include <net/bridge.h>
-#endif
-
-#include <netinet/in.h>
-#include <netinet/in_var.h>
-#include <netinet/if_ether.h>
-
-#include <net/iso88025.h>
-
-#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;
-}
projects / apple / xnu.git / blobdiff