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//==========================================================================

//

//      sys/net/if_ethersubr.c

//

//     

//

//==========================================================================

//####BSDCOPYRIGHTBEGIN####

//

// -------------------------------------------

//

// Portions of this software may have been derived from OpenBSD or other sources,

// and are covered by the appropriate copyright disclaimers included herein.

//

// -------------------------------------------

//

//####BSDCOPYRIGHTEND####

//==========================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):    gthomas

// Contributors: gthomas

// Date:         2000-01-10

// Purpose:      

// Description:  

//              

//

//####DESCRIPTIONEND####

//

//==========================================================================

/*      $OpenBSD: if_ethersubr.c,v 1.32 1999/12/08 06:50:17 itojun Exp $        */

/*      $NetBSD: if_ethersubr.c,v 1.19 1996/05/07 02:40:30 thorpej Exp $        */

/*

 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.

 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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.

 */

/*

 * Copyright (c) 1982, 1989, 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_ethersubr.c      8.1 (Berkeley) 6/10/93

 */

/*

%%% portions-copyright-nrl-95

Portions of this software are Copyright 1995-1998 by Randall Atkinson,

Ronald Lee, Daniel McDonald, Bao Phan, and Chris Winters. All Rights

Reserved. All rights under this copyright have been assigned to the US

Naval Research Laboratory (NRL). The NRL Copyright Notice and License

Agreement Version 1.1 (January 17, 1995) applies to these portions of the

software.

You should have received a copy of the license with this software. If you

didn't get a copy, you may request one from <license@ipv6.nrl.navy.mil>.

*/

#include <sys/param.h>

#ifndef __ECOS

#include <sys/systm.h>

#endif

#include <sys/kernel.h>

#include <sys/malloc.h>

#include <sys/mbuf.h>

#include <sys/protosw.h>

#include <sys/socket.h>

#include <sys/ioctl.h>

#include <sys/errno.h>

#ifndef __ECOS

#include <sys/syslog.h>

#endif

#include <machine/cpu.h>

#include <net/if.h>

#include <net/netisr.h>

#include <net/route.h>

#include <net/if_llc.h>

#include <net/if_dl.h>

#include <net/if_types.h>

#include <netinet/in.h>

#ifdef INET

#include <netinet/in_var.h>

#endif

#include <netinet/if_ether.h>

#ifndef __ECOS

#include "bridge.h"

#endif

#if NBRIDGE > 0

#include <net/if_bridge.h>

#endif

#ifdef INET6

#ifndef INET

#include <netinet/in.h>

#endif

#include <netinet6/in6_var.h>

#include <netinet6/nd6.h>

#endif

#ifdef NS

#include <netns/ns.h>

#include <netns/ns_if.h>

#endif

#ifdef IPX

#include <netipx/ipx.h>

#include <netipx/ipx_if.h>

#endif

#ifdef ISO

#include <netiso/argo_debug.h>

#include <netiso/iso.h>

#include <netiso/iso_var.h>

#include <netiso/iso_snpac.h>

#endif

#ifdef CCITT

#include <netccitt/x25.h>

#include <netccitt/pk.h>

#include <netccitt/pk_extern.h>

#include <netccitt/dll.h>

#include <netccitt/llc_var.h>

#endif

#ifdef NETATALK

#include <netatalk/at.h>

#include <netatalk/at_var.h>

#include <netatalk/at_extern.h>

#define llc_snap_org_code llc_un.type_snap.org_code

#define llc_snap_ether_type llc_un.type_snap.ether_type

extern u_char   at_org_code[ 3 ];

extern u_char   aarp_org_code[ 3 ];

#endif /* NETATALK */

#if defined(CCITT)

#include <sys/socketvar.h>

#endif

#if 0   /*NRL INET6*/

#include <netinet6/in6.h>

#include <netinet6/in6_var.h>

#endif /* INET6 */

u_char  etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

#define senderr(e) { error = (e); goto bad;}

int

ether_ioctl(ifp, arp, cmd, data)

        register struct ifnet *ifp;

        struct arpcom *arp;

        u_long cmd;

        caddr_t data;

{

        struct ifaddr *ifa = (struct ifaddr *)data;

        int     error = 0;

        switch (cmd) {

#if defined(CCITT)

        case SIOCSIFCONF_X25:

                ifp->if_flags |= IFF_UP;

                ifa->ifa_rtrequest = cons_rtrequest;

                error = x25_llcglue(PRC_IFUP, ifa->ifa_addr);

                break;

#endif /* CCITT */

        case SIOCSIFADDR:

                switch (ifa->ifa_addr->sa_family) {

#ifdef IPX

                case AF_IPX:

                    {

                        struct ipx_addr *ina = &IA_SIPX(ifa)->sipx_addr;

                        if (ipx_nullhost(*ina))

                                ina->ipx_host =

                                    *(union ipx_host *)(arp->ac_enaddr);

                        else

                                bcopy(ina->ipx_host.c_host,

                                    arp->ac_enaddr, sizeof(arp->ac_enaddr));

                        break;

                    }

#endif /* IPX */

#ifdef NETATALK

                case AF_APPLETALK:

                        /* Nothing to do. */

                        break;

#endif /* NETATALK */

#ifdef NS

                /* XXX - This code is probably wrong. */

                case AF_NS:

                    {

                        struct ns_addr *ina = &IA_SNS(ifa)->sns_addr;

                        if (ns_nullhost(*ina))

                                ina->x_host =

                                    *(union ns_host *)(arp->ac_enaddr);

                        else

                                bcopy(ina->x_host.c_host,

                                    arp->ac_enaddr, sizeof(arp->ac_enaddr));

                        break;

                    }

#endif /* NS */

                }

                break;

        default:

                break;

        }

        return error;

}

/*

 * Ethernet output routine.

 * Encapsulate a packet of type family for the local net.

 * Assumes that ifp is actually pointer to arpcom structure.

 */

int

ether_output(ifp, m0, dst, rt0)

        register struct ifnet *ifp;

        struct mbuf *m0;

        struct sockaddr *dst;

        struct rtentry *rt0;

{

        u_int16_t etype;

        int s, error = 0;

        u_char edst[6];

        register struct mbuf *m = m0;

        register struct rtentry *rt;

        struct mbuf *mcopy = (struct mbuf *)0;

        register struct ether_header *eh;

        struct arpcom *ac = (struct arpcom *)ifp;

        if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING))

                senderr(ENETDOWN);

        ifp->if_lastchange = time;

        if ((rt = rt0) != NULL) {

                if ((rt->rt_flags & RTF_UP) == 0) {

                        if ((rt0 = rt = rtalloc1(dst, 1)) != NULL)

                                rt->rt_refcnt--;

                        else

                                senderr(EHOSTUNREACH);

                }

                if (rt->rt_flags & RTF_GATEWAY) {

                        if (rt->rt_gwroute == 0)

                                goto lookup;

                        if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) {

                                rtfree(rt); rt = rt0;

                        lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1);

                                if ((rt = rt->rt_gwroute) == 0)

                                        senderr(EHOSTUNREACH);

                        }

                }

                if (rt->rt_flags & RTF_REJECT)

                        if (rt->rt_rmx.rmx_expire == 0 ||

                            time.tv_sec < rt->rt_rmx.rmx_expire)

                                senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);

        }

        switch (dst->sa_family) {

#ifdef INET

        case AF_INET:

                if (!arpresolve(ac, rt, m, dst, edst))

                        return (0);      /* if not yet resolved */

                /* If broadcasting on a simplex interface, loopback a copy */

                if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))

                        mcopy = m_copy(m, 0, (int)M_COPYALL);

                etype = htons(ETHERTYPE_IP);

                break;

#endif

#ifdef INET6

        case AF_INET6:

#ifndef OLDIP6OUTPUT

                if (!nd6_storelladdr(ifp, rt, m, dst, (u_char *)edst))

                        return(0); /* it must be impossible, but... */

#else

                if (!nd6_resolve(ifp, rt, m, dst, (u_char *)edst))

                        return(0);       /* if not yet resolves */

#endif

                etype = htons(ETHERTYPE_IPV6);

                break;

#endif

#ifdef NS

        case AF_NS:

                etype = htons(ETHERTYPE_NS);

                bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host),

                    (caddr_t)edst, sizeof (edst));

                if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst)))

                        return (looutput(ifp, m, dst, rt));

                /* If broadcasting on a simplex interface, loopback a copy */

                if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))

                        mcopy = m_copy(m, 0, (int)M_COPYALL);

                break;

#endif

#ifdef IPX

        case AF_IPX:

                etype = htons(ETHERTYPE_IPX);

                bcopy((caddr_t)&satosipx(dst)->sipx_addr.ipx_host,

                    (caddr_t)edst, sizeof (edst));

                if (!bcmp((caddr_t)edst, (caddr_t)&ipx_thishost, sizeof(edst)))

                        return (looutput(ifp, m, dst, rt));

                /* If broadcasting on a simplex interface, loopback a copy */

                if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX))

                        mcopy = m_copy(m, 0, (int)M_COPYALL);

                break;

#endif

#if 0   /*NRL INET6*/

        case AF_INET6:

                /*

                 * The bottom line here is to either queue the outgoing packet

                 * in the discovery engine, or fill in edst with something

                 * that'll work.

                 */

                if (m->m_flags & M_MCAST) {

                        /*

                         * If multicast dest., then use IPv6 -> Ethernet

                         * mcast mapping.  Really simple.

                         */

                        ETHER_MAP_IPV6_MULTICAST(&((struct sockaddr_in6 *)dst)->sin6_addr,

                            edst);

                } else {

                        /* Do unicast neighbor discovery stuff. */

                        if (!ipv6_discov_resolve(ifp, rt, m, dst, edst))

                                return 0;

                }

                etype = htons(ETHERTYPE_IPV6);

                break;

#endif /* INET6 */

#ifdef NETATALK

        case AF_APPLETALK: {

                struct at_ifaddr *aa;

                if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) {

#ifdef NETATALKDEBUG

                        extern char *prsockaddr(struct sockaddr *);

                        printf("aarpresolv: failed for %s\n", prsockaddr(dst));

#endif /* NETATALKDEBUG */

                        return (0);

                }

                /*

                 * ifaddr is the first thing in at_ifaddr

                 */

                aa = (struct at_ifaddr *)at_ifawithnet(

                        (struct sockaddr_at *)dst,

                        ifp->if_addrlist.tqh_first);

                if (aa == 0)

                        goto bad;

                /*

                 * In the phase 2 case, we need to prepend an mbuf for the llc

                 * header. Since we must preserve the value of m, which is

                 * passed to us by value, we m_copy() the first mbuf,

                 * and use it for our llc header.

                 */

                if ( aa->aa_flags & AFA_PHASE2 ) {

                        struct llc llc;

                        /* XXX Really this should use netisr too */

                        M_PREPEND(m, AT_LLC_SIZE, M_WAIT);

                        /*

                         * FreeBSD doesn't count the LLC len in

                         * ifp->obytes, so they increment a length

                         * field here. We don't do this.

                         */

                        llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP;

                        llc.llc_control = LLC_UI;

                        bcopy(at_org_code, llc.llc_snap_org_code,

                                sizeof(at_org_code));

                        llc.llc_snap_ether_type = htons( ETHERTYPE_AT );

                        bcopy(&llc, mtod(m, caddr_t), AT_LLC_SIZE);

                        etype = htons(m->m_pkthdr.len);

                } else {

                        etype = htons(ETHERTYPE_AT);

                }

                } break;

#endif /* NETATALK */

#ifdef  ISO

        case AF_ISO: {

                int     snpalen;

                struct  llc *l;

                register struct sockaddr_dl *sdl;

                if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) &&

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

                        bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst));

                } else {

                        error = iso_snparesolve(ifp, (struct sockaddr_iso *)dst,

                                                (char *)edst, &snpalen);

                        if (error)

                                goto bad; /* Not Resolved */

                }

                /* If broadcasting on a simplex interface, loopback a copy */

                if (*edst & 1)

                        m->m_flags |= (M_BCAST|M_MCAST);

                if ((m->m_flags & M_BCAST) && (ifp->if_flags & IFF_SIMPLEX) &&

                    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {

                        M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);

                        if (mcopy) {

                                eh = mtod(mcopy, struct ether_header *);

                                bcopy(edst, eh->ether_dhost, sizeof (edst));

                                bcopy(ac->ac_enaddr, eh->ether_shost,

                                    sizeof (edst));

                        }

                }

                M_PREPEND(m, 3, M_DONTWAIT);

                if (m == NULL)

                        return (0);

                etype = htons(m->m_pkthdr.len);

                l = mtod(m, struct llc *);

                l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP;

                l->llc_control = LLC_UI;

#ifdef ARGO_DEBUG

                if (argo_debug[D_ETHER]) {

                        int i;

                        printf("unoutput: sending pkt to: ");

                        for (i=0; i<6; i++)

                                printf("%x ", edst[i] & 0xff);

                        printf("\n");

                }

#endif

                } break;

#endif /* ISO */

/*      case AF_NSAP: */

        case AF_CCITT: {

                register struct sockaddr_dl *sdl =

                        (struct sockaddr_dl *) rt -> rt_gateway;

                if (sdl && sdl->sdl_family == AF_LINK

                    && sdl->sdl_alen > 0) {

                        bcopy(LLADDR(sdl), (char *)edst,

                                sizeof(edst));

                } else goto bad; /* Not a link interface ? Funny ... */

                if ((ifp->if_flags & IFF_SIMPLEX) && (*edst & 1) &&

                    (mcopy = m_copy(m, 0, (int)M_COPYALL))) {

                        M_PREPEND(mcopy, sizeof (*eh), M_DONTWAIT);

                        if (mcopy) {

                                eh = mtod(mcopy, struct ether_header *);

                                bcopy(edst, eh->ether_dhost, sizeof (edst));

                                bcopy(ac->ac_enaddr, eh->ether_shost,

                                    sizeof (edst));

                        }

                }

                etype = htons(m->m_pkthdr.len);

#ifdef LLC_DEBUG

                {

                        int i;

                        register struct llc *l = mtod(m, struct llc *);

                        printf("ether_output: sending LLC2 pkt to: ");

                        for (i=0; i<6; i++)

                                printf("%x ", edst[i] & 0xff);

                        printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n",

                            m->m_pkthdr.len, l->llc_dsap & 0xff, l->llc_ssap &0xff,

                            l->llc_control & 0xff);

                }

#endif /* LLC_DEBUG */

                } break;

        case AF_UNSPEC:

                eh = (struct ether_header *)dst->sa_data;

                bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, sizeof (edst));

                /* AF_UNSPEC doesn't swap the byte order of the ether_type. */

                etype = eh->ether_type;

                break;

        default:

#ifdef __ECOS

//              diag_printf("%s: can't handle af%d\n", ifp->if_xname,

//                            dst->sa_family);

#else

                printf("%s: can't handle af%d\n", ifp->if_xname,

                        dst->sa_family);

#endif

                senderr(EAFNOSUPPORT);

        }

        if (mcopy)

                (void) looutput(ifp, mcopy, dst, rt);

        /*

         * Add local net header.  If no space in first mbuf,

         * allocate another.

         */

        M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT);

        if (m == 0)

                senderr(ENOBUFS);

        eh = mtod(m, struct ether_header *);

        bcopy((caddr_t)&etype,(caddr_t)&eh->ether_type,

                sizeof(eh->ether_type));

        bcopy((caddr_t)edst, (caddr_t)eh->ether_dhost, sizeof (edst));

        bcopy((caddr_t)ac->ac_enaddr, (caddr_t)eh->ether_shost,

            sizeof(eh->ether_shost));

#if NBRIDGE > 0

        /*

         * Interfaces that are bridge members need special handling

         * for output.

         */

        if (ifp->if_bridge) {

                bridge_output(ifp, m, NULL, NULL);

                return (error);

        }

#endif

        s = splimp();

        /*

         * Queue message on interface, and start output if interface

         * not yet active.

         */

        if (IF_QFULL(&ifp->if_snd)) {

                // Let the interface try a dequeue anyway, in case the

                // interface has "got better" from whatever made the queue

                // fill up - being unplugged for example.

                if ((ifp->if_flags & IFF_OACTIVE) == 0)

                    (*ifp->if_start)(ifp);

                IF_DROP(&ifp->if_snd);

                splx(s);

                senderr(ENOBUFS);

        }

        ifp->if_obytes += m->m_pkthdr.len;

        IF_ENQUEUE(&ifp->if_snd, m);

        if (m->m_flags & M_MCAST)

                ifp->if_omcasts++;

        if ((ifp->if_flags & IFF_OACTIVE) == 0)

                (*ifp->if_start)(ifp);

        splx(s);

        return (error);

bad:

        if (m)

                m_freem(m);

        return (error);

}

/*

 * Process a received Ethernet packet;

 * the packet is in the mbuf chain m without

 * the ether header, which is provided separately.

 */

void

ether_input(ifp, eh, m)

        struct ifnet *ifp;

        register struct ether_header *eh;

        struct mbuf *m;

{

        register struct ifqueue *inq;

        u_int16_t etype;

        int s, llcfound = 0;

        register struct llc *l;

        struct arpcom *ac = (struct arpcom *)ifp;

#ifdef __ECOS

        unsigned int sched_what;

#endif

        if ((ifp->if_flags & IFF_UP) == 0) {

                m_freem(m);

                return;

        }

        ifp->if_lastchange = time;

        ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);

        if (eh->ether_dhost[0] & 1) {

                if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost,

                    sizeof(etherbroadcastaddr)) == 0)

                        m->m_flags |= M_BCAST;

                else

                        m->m_flags |= M_MCAST;

        }

        if (m->m_flags & (M_BCAST|M_MCAST))

                ifp->if_imcasts++;

#if NBRIDGE > 0

        /*

         * Tap the packet off here for a bridge, if configured and

         * active for this interface.  bridge_input returns

         * NULL if it has consumed the packet, otherwise, it

         * gets processed as normal.

         */

        if (ifp->if_bridge) {

                m = bridge_input(ifp, eh, m);

                if (m == NULL)

                        return;

                /* The bridge has determined it's for us. */

                goto decapsulate;

        }

#endif

        /*

         * If packet is unicast and we're in promiscuous mode, make sure it

         * is for us.  Drop otherwise.

         */

        if ((m->m_flags & (M_BCAST|M_MCAST)) == 0 &&

            (ifp->if_flags & IFF_PROMISC)) {

                if (bcmp(ac->ac_enaddr, (caddr_t)eh->ether_dhost,

                    ETHER_ADDR_LEN)) {

                        m_freem(m);

                        return;

                }

        }

decapsulate:

        etype = ntohs(eh->ether_type);

        switch (etype) {

#ifdef INET

        case ETHERTYPE_IP:

#ifdef __ECOS

                sched_what = NETISR_IP;

#else

                schednetisr(NETISR_IP);

#endif

                inq = &ipintrq;

                break;

        case ETHERTYPE_ARP:

                if (ifp->if_flags & IFF_NOARP)

                        goto dropanyway;

#ifdef __ECOS