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/*

 * 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

 * $Id: if_ether.c,v 1.2 2001-09-27 12:01:55 chris 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/sysctl.h>

#include <sys/queue.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/route.h>

#include <net/netisr.h>

#include <netinet/in.h>

#include <netinet/in_var.h>

#include <netinet/if_ether.h>

#define SIN(s) ((struct sockaddr_in *)s)

#define SDL(s) ((struct sockaddr_dl *)s)

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 = {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;

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_rtrequest __P((int, struct rtentry *, struct sockaddr *));

static void     arprequest __P((struct arpcom *, u_long *, u_long *, u_char *));

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));

static void     in_arpinput __P((struct mbuf *));

/*

 * Timeout routine.  Age arp_tab entries periodically.

 */

/* ARGSUSED */

static void

arptimer(ignored_arg)

        void *ignored_arg;

{

        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 <= rtems_bsdnet_seconds_since_boot())

                        arptfree(ola); /* timer has expired, clear */

        }

        splx(s);

}

/*

 * Parallel to llc_rtrequest.

 */

static 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);

        }

        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 = rtems_bsdnet_seconds_since_boot();

                        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.s_addr,

                            &SIN(rt_key(rt))->sin_addr.s_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);

                /*

                 * 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 = 0;

                }

                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 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 u_long *sip, *tip;

        register u_char *enaddr;

{

        register struct mbuf *m;

        register struct ether_header *eh;

        register struct ether_arp *ea;

        struct sockaddr sa;

        if ((m = m_gethdr(M_DONTWAIT, MT_DATA)) == NULL)

                return;

        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));

        (void)memcpy(eh->ether_dhost, etherbroadcastaddr, sizeof(eh->ether_dhost));

        eh->ether_type = htons(ETHERTYPE_ARP);  /* if_output will not swap */

        ea->arp_hrd = htons(ARPHRD_ETHER);

        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);

        (*ac->ac_if.if_output)(&ac->ac_if, 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(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;

{

        register struct llinfo_arp *la;

        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;

        else {

                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\n",

                        inet_ntoa(SIN(dst)->sin_addr));

                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 > rtems_bsdnet_seconds_since_boot()) &&

            sdl->sdl_family == AF_LINK && sdl->sdl_alen != 0) {

                bcopy(LLADDR(sdl), desten, sdl->sdl_alen);

                return 1;

        }

        /*

         * 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 != rtems_bsdnet_seconds_since_boot()) {

                        rt->rt_expire = rtems_bsdnet_seconds_since_boot();

                        if (la->la_asked++ < arp_maxtries)

                            arprequest(ac,

                                &(SIN(rt->rt_ifa->ifa_addr)->sin_addr.s_addr),

                                &(SIN(dst)->sin_addr.s_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(void)

{

        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) &&

                    (ar = mtod(m, struct arphdr *)) &&

                    ntohs(ar->ar_hrd) == ARPHRD_ETHER &&

                    m->m_len >=

                      sizeof(struct arphdr) + 2 * ar->ar_hln + 2 * ar->ar_pln)

                            switch (ntohs(ar->ar_pro)) {

                            case ETHERTYPE_IP:

                                    in_arpinput(m);

                                    continue;

                            }

                m_freem(m);

        }

}

NETISR_SET(NETISR_ARP, arpintr);

/*

 * 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 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;

        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;

        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));

        for (ia = in_ifaddr; ia; ia = ia->ia_next)

                if (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) {

                log(LOG_ERR,

                   "arp: %6D is using my IP address %s!\n",

                   ea->arp_sha, ":", 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))) {

                if (sdl->sdl_alen &&

                    bcmp((caddr_t)ea->arp_sha, LLADDR(sdl), sdl->sdl_alen))

                        log(LOG_INFO, "arp: %s moved from %6D to %6D\n",

                            inet_ntoa(isaddr), (u_char *)LLADDR(sdl), ":",

                            ea->arp_sha, ":");

                (void)memcpy(LLADDR(sdl), ea->arp_sha, sizeof(ea->arp_sha));

                sdl->sdl_alen = sizeof(ea->arp_sha);

                if (rt->rt_expire)

                        rt->rt_expire = rtems_bsdnet_seconds_since_boot() + arpt_keep;

                rt->rt_flags &= ~RTF_REJECT;

                la->la_asked = 0;

                if (la->la_hold) {

                        (*ac->ac_if.if_output)(&ac->ac_if, 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(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);

#ifdef 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! */

        eh = (struct ether_header *)sa.sa_data;

        (void)memcpy(eh->ether_dhost, ea->arp_tha, sizeof(eh->ether_dhost));

        eh->ether_type = htons(ETHERTYPE_ARP);

        sa.sa_family = AF_UNSPEC;

        sa.sa_len = sizeof(sa);

        (*ac->ac_if.if_output)(&ac->ac_if, m, &sa, (struct rtentry *)0);

        return;

}

/*

 * 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",