xnu-201.42.3.tar.gz

[apple/xnu.git] / bsd / net / dlil_ethersubr.c

/*
 * 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, 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.
 *
 */



#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.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 <net/ndrv.h>

#if INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#endif
#if INET6
#include <netinet6/nd6.h>
#include <netinet6/in6_ifattach.h>
#endif


#include <sys/socketvar.h>
#include <net/if_blue.h>

#include <net/dlil.h>


#if LLC && CCITT
extern struct ifqueue pkintrq;
#endif

/* General stuff from if_ethersubr.c - may not need some of it */

#include <netat/at_pat.h>
#if NETAT
extern struct ifqueue atalkintrq;
#endif


#if BRIDGE
#include <net/bridge.h>
#endif

/* #include "vlan.h" */
#if NVLAN > 0
#include <net/if_vlan_var.h>
#endif /* NVLAN > 0 */


extern struct ifnet_blue *blue_if;
extern struct mbuf *splitter_input(struct mbuf *, struct ifnet *);

static u_long lo_dlt = 0;
static ivedonethis = 0;
static  int ether_resolvemulti __P((struct ifnet *, struct sockaddr **, 
                                    struct sockaddr *));
u_char  etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

#define IFP2AC(IFP) ((struct arpcom *)IFP)

/* This stuff is new */

#define DB_HEADER_SIZE 20
struct en_desc {
    short           total_len;
    u_short         ethertype;
    u_long          dl_tag;
    struct ifnet    *ifp;
    struct if_proto *proto;
    u_long          proto_id_length;
    u_long           proto_id_data[8]; /* probably less - proto-id and bitmasks */
};
    
#define LITMUS_SIZE 16
#define ETHER_DESC_BLK_SIZE 50
#define MAX_INTERFACES 50

/*
 * Statics for demux module
 */

struct ether_desc_blk_str {
    u_long   n_blocks;
    u_long   *block_ptr;
};

struct dl_es_at_entry 
{
     struct ifnet *ifp;
     u_long       dl_tag;
     int    ref_count;
};


static struct ether_desc_blk_str ether_desc_blk[MAX_INTERFACES];
static u_long  litmus_mask[LITMUS_SIZE];
static u_long  litmus_length = 0;


/*
 * Temp static for protocol registration XXX
 */

#define MAX_EN_COUNT 30

static struct dl_es_at_entry en_at_array[MAX_EN_COUNT];

/*
 * This could be done below in-line with heavy casting, but the pointer arithmetic is 
 * prone to error.
 */

static
int  desc_in_bounds(block, current_ptr, offset_length)
    u_int  block;
    char   *current_ptr;
    u_long offset_length;
{
    u_long end_of_block;
    u_long current_ptr_tmp;

    current_ptr_tmp = (u_long) current_ptr;
    end_of_block = (u_long) ether_desc_blk[block].block_ptr;
    end_of_block += (ETHER_DESC_BLK_SIZE * ether_desc_blk[block].n_blocks);
    if ((current_ptr_tmp + offset_length) < end_of_block)
        return 1;
    else
        return 0;
}


/*
 * Release all descriptor entries owned by this dl_tag (there may be several).
 * Setting the dl_tag to 0 releases the entry. Eventually we should compact-out
 * the unused entries.
 */
static
int  ether_del_proto(struct if_proto *proto, u_long dl_tag)
{
    char *current_ptr = (char *) ether_desc_blk[proto->ifp->family_cookie].block_ptr;
    struct en_desc         *ed;
    int i;
    int found = 0;

    ed = (struct en_desc *) current_ptr;

    while(ed->total_len) {
        if (ed->dl_tag == dl_tag) {
            found = 1;
            ed->dl_tag = 0;
        }

        current_ptr += ed->total_len;
        ed = (struct en_desc *) current_ptr;
    }
 }



static
int  ether_add_proto(struct ddesc_head_str *desc_head, struct if_proto *proto, u_long dl_tag)
{
   char *current_ptr;
   struct dlil_demux_desc  *desc;
   u_long                  id_length; /* IN LONGWORDS!!! */
   struct en_desc          *ed;
   u_long                  *bitmask;
   u_long                  *proto_id;
   int                     i;
   short                   total_length;
   u_long                  block_count;
   u_long                  *tmp;


   TAILQ_FOREACH(desc, desc_head, next) {
       switch (desc->type) 
       {
       case DLIL_DESC_RAW:
           id_length   = desc->variants.bitmask.proto_id_length;
           break;
           
       case DLIL_DESC_802_2:
           id_length = 1; 
           break;
           
       case DLIL_DESC_802_2_SNAP:
           id_length = 2;
           break;
           
       default:
           return EINVAL;
       }

restart:
       block_count = ether_desc_blk[proto->ifp->family_cookie].n_blocks;
       current_ptr =  (char *) ether_desc_blk[proto->ifp->family_cookie].block_ptr;
       ed = (struct en_desc *) current_ptr;
       total_length = ((id_length << 2) * 2) + DB_HEADER_SIZE;

       while ((ed->total_len) && (desc_in_bounds(proto->ifp->family_cookie, 
                              current_ptr, total_length))) {
           if ((ed->dl_tag == 0) && (total_length <= ed->total_len)) 
               break;
           else
               current_ptr += *(short *)current_ptr;
           
           ed = (struct en_desc *) current_ptr;
       }

       if (!desc_in_bounds(proto->ifp->family_cookie, current_ptr, total_length)) {

           tmp = _MALLOC((ETHER_DESC_BLK_SIZE * (block_count + 1)), 
                         M_IFADDR, M_WAITOK);
           if (tmp  == 0) {
               /*
                * Remove any previous descriptors set in the call.
                */
               ether_del_proto(proto, dl_tag);
               return ENOMEM;
           }

           bzero(tmp, ETHER_DESC_BLK_SIZE * (block_count + 1));
           bcopy(ether_desc_blk[proto->ifp->family_cookie].block_ptr, 
                 tmp, (ETHER_DESC_BLK_SIZE * block_count));
           FREE(ether_desc_blk[proto->ifp->family_cookie].block_ptr, M_IFADDR);
           ether_desc_blk[proto->ifp->family_cookie].n_blocks = block_count + 1;
           ether_desc_blk[proto->ifp->family_cookie].block_ptr = tmp;
           goto restart;
       }

       if (ed->total_len == 0)
           ed->total_len = total_length;
       ed->ethertype = *((u_short *) desc->native_type);

       ed->dl_tag    = dl_tag;
       ed->proto     = proto;
       ed->proto_id_length = id_length;
       ed->ifp       = proto->ifp;

       switch (desc->type)
       {
       case DLIL_DESC_RAW:
           bcopy(desc->variants.bitmask.proto_id, &ed->proto_id_data[0], (id_length << 2) );
           bcopy(desc->variants.bitmask.proto_id_mask, &ed->proto_id_data[id_length],
                 (id_length << 2));
           break;

       case DLIL_DESC_802_2:
           ed->proto_id_data[0] = 0;
           bcopy(&desc->variants.desc_802_2, &ed->proto_id_data[0], 3);
           ed->proto_id_data[1] = 0xffffff00;
           break;

       case DLIL_DESC_802_2_SNAP:
           /* XXX Add verification of fixed values here */

           ed->proto_id_data[0] = 0;
           ed->proto_id_data[1] = 0;
           bcopy(&desc->variants.desc_802_2_SNAP, &ed->proto_id_data[0], 8);
           ed->proto_id_data[2] = 0xffffffff;
           ed->proto_id_data[3] = 0xffffffff;;
           break;  
       }
       
       if (id_length) {
           proto_id = (u_long *) &ed->proto_id_data[0];
           bitmask  = (u_long *) &ed->proto_id_data[id_length];
           for (i=0; i < (id_length); i++) {
               litmus_mask[i] &= bitmask[i];
               litmus_mask[i] &= proto_id[i];
           }
           if (id_length > litmus_length)
               litmus_length = id_length;
       }
   }    

   return 0;
} 


static
int  ether_shutdown()
{
    return 0;
}




/*
 * Process a received Ethernet packet;
 * the packet is in the mbuf chain m without
 * the ether header, which is provided separately.
 */
int
new_ether_input(m, frame_header, ifp, dl_tag, sync_ok)
    struct mbuf  *m;
    char         *frame_header;
    struct ifnet *ifp;
    u_long           dl_tag;
    int          sync_ok;

{
    register struct ether_header *eh = (struct ether_header *) frame_header;
    register struct ifqueue *inq=0;
    u_short ether_type;
    int s;
    u_int16_t ptype = -1;
    unsigned char buf[18];

#if ISO || LLC || NETAT
    register struct llc *l;
#endif


#if DLIL_BLUEBOX

    /*
     * Y-adapter input processing:
     *  - Don't split if coming from a dummy if
     *  - If coming from a real if, if splitting enabled,
     *    then filter the incoming packet
     */
    if (ifp != (struct ifnet *)blue_if)
    {   /* Is splitter turned on? */
        if (ifp->if_flags&IFF_SPLITTER)
        {       m->m_data -= sizeof(struct ether_header);
        m->m_len += sizeof (struct ether_header);
        m->m_pkthdr.len += sizeof(struct ether_header);
        /*
         * Check to see if destined for BlueBox or Rhapsody
         * If NULL return, mbuf's been consumed by the BlueBox.
         * Otherwise, send on to Rhapsody
         */
        if ((m = splitter_input(m, ifp)) == NULL)
            return EJUSTRETURN;
        m->m_data += sizeof(struct ether_header);
        m->m_len -= sizeof (struct ether_header);
        m->m_pkthdr.len -= sizeof(struct ether_header);
        }
    } else
    {   /* Get the "real" IF */
        ifp = ((struct ndrv_cb *)(blue_if->ifb_so->so_pcb))->nd_if;
        m->m_pkthdr.rcvif = ifp;
        blue_if->pkts_looped_b2r++;
    }

#endif
    if ((ifp->if_flags & IFF_UP) == 0) {
        m_freem(m);
        return EJUSTRETURN;
    }

    ifp->if_lastchange = time;

    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++;

    ether_type = ntohs(eh->ether_type);

#if NVLAN > 0
        if (ether_type == vlan_proto) {
                if (vlan_input(eh, m) < 0)
                        ifp->if_data.ifi_noproto++;
                return EJUSTRETURN;
        }
#endif /* NVLAN > 0 */

    switch (ether_type) {
#if INET
    case ETHERTYPE_IP:
        if (ipflow_fastforward(m))
            return EJUSTRETURN;
        ptype = mtod(m, struct ip *)->ip_p;
        if ((sync_ok == 0) || 
            (ptype != IPPROTO_TCP && ptype != IPPROTO_UDP)) {
            schednetisr(NETISR_IP); 
        }

        inq = &ipintrq;
        break;

    case ETHERTYPE_ARP:
        schednetisr(NETISR_ARP);
        inq = &arpintrq;
        break;
#endif
#if INET6                       
    case ETHERTYPE_IPV6:
        schednetisr(NETISR_IPV6);
        inq = &ip6intrq;
        break;
#endif  


    default: {
#if NETAT
        if (ether_type > ETHERMTU)
            return ENOENT;
        l = mtod(m, struct llc *);
        switch (l->llc_dsap) {
        case LLC_SNAP_LSAP:

            /* Temporary hack: check for AppleTalk and AARP packets */
            /* WARNING we're checking only on the "ether_type" (the 2 bytes
             * of the SNAP header. This shouldn't be a big deal, 
             * AppleTalk pat_input is making sure we have the right packets
             * because it needs to discrimante AARP from EtherTalk packets.
             */

            if (l->llc_ssap == LLC_SNAP_LSAP &&
                l->llc_un.type_snap.control == 0x03) {

#ifdef APPLETALK_DEBUG
                printf("new_ether_input: SNAP Cntrol type=0x%x Src=%s\n",
                       l->llc_un.type_snap.ether_type,
                       ether_sprintf(buf, &eh->ether_shost));
                printf("                                     Dst=%s\n",
                       ether_sprintf(buf, &eh->ether_dhost));
#endif /* APPLETALK_DEBUG */

                if ((l->llc_un.type_snap.ether_type == 0x809B) ||
                    (l->llc_un.type_snap.ether_type == 0x80F3)) {


                                /*
                                 * note: for AppleTalk we need to pass the enet header of the
                                 * packet up stack. To do so, we made sure in that the FULL packet
                                 * is copied in the mbuf by the mace driver, and only the m_data and
                                 * length have been shifted to make IP and the other guys happy.
                                 */

                    m->m_data -= sizeof(*eh);
                    m->m_len += sizeof(*eh);
                    m->m_pkthdr.len += sizeof(*eh);     
#ifdef APPLETALK_DEBUG
                    l == (struct llc *)(eh+1);
                    if (l->llc_un.type_snap.ether_type == 0x80F3) {
                        kprintf("new_ether_input: RCV AppleTalk type=0x%x Src=%s\n",
                                l->llc_un.type_snap.ether_type,
                                ether_sprintf(buf, &eh->ether_shost));
                        kprintf("                                     Dst=%s\n",
                                ether_sprintf(buf, &eh->ether_dhost));
                    }
#endif /* APPLETALK_DEBUG */
                    schednetisr(NETISR_APPLETALK);
                    inq = &atalkintrq ;
                    
                    break;
                }
            }
            
            break;
            
            
        default:
            return ENOENT;
        }

#else /*NETAT*/
        return ENOENT;
#endif /* NETAT */

        }
    }

    if (inq == 0)
        return ENOENT;

        s = splimp();
        if (IF_QFULL(inq)) {
                IF_DROP(inq);
                m_freem(m);
                splx(s);
                return EJUSTRETURN;
        } else
                IF_ENQUEUE(inq, m);
        splx(s);

    if ((sync_ok) && 
        (ptype == IPPROTO_TCP || ptype == IPPROTO_UDP)) {
        extern void ipintr(void);

        s = splnet();
        ipintr();
        splx(s);
    }

    return 0;
}




int ether_demux(ifp, m, frame_header, proto)
    struct ifnet *ifp;
    struct mbuf  *m;
    char         *frame_header;
    struct if_proto **proto;

{
    register struct ether_header *eh = (struct ether_header *)frame_header;
    u_short ether_type;
    char *current_ptr = (char *) ether_desc_blk[ifp->family_cookie].block_ptr;
    struct dlil_demux_desc  *desc;
    register u_long          temp;
    u_long                  *data;
    register struct if_proto *ifproto;
    u_long                   i;
    struct en_desc           *ed;


    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;
    }

    ether_type = ntohs(eh->ether_type);

    /* 
     * Search through the connected protocols for a match. 
     */


    data = mtod(m, u_long *);
    ed = (struct en_desc *) current_ptr;
    while (desc_in_bounds(ifp->family_cookie, current_ptr, DB_HEADER_SIZE)) {
        if (ed->total_len == 0)
            break;

        if ((ed->dl_tag !=  0) && (ed->ifp == ifp) && 
            ((ed->ethertype == ntohs(eh->ether_type)) || (ed->ethertype == 0))) {
            if (ed->proto_id_length) {
                for (i=0; i < (ed->proto_id_length); i++) {
                    temp = ntohs(data[i]) & ed->proto_id_data[ed->proto_id_length + i];
                    if ((temp ^ ed->proto_id_data[i]))
                        break;
                }

                if (i >= (ed->proto_id_length)) {
                    *proto = ed->proto;
                    return 0;
                }
            }
            else {
                *proto = ed->proto;
                return 0;
            }
        }
        current_ptr += ed->total_len;
        ed = (struct en_desc *) current_ptr;
    }

/*
    kprintf("ether_demux - No match for <%x><%x><%x><%x><%x><%x><%x<%x>\n",
            eh->ether_type,data[0], data[1], data[2], data[3], data[4],data[5],data[6]);
*/

    return ENOENT;
}                       



/*
 * Ethernet output routine.
 * Encapsulate a packet of type family for the local net.
 * Use trailer local net encapsulation if enough data in first
 * packet leaves a multiple of 512 bytes of data in remainder.
 * Assumes that ifp is actually pointer to arpcom structure.
 */
int
ether_frameout(ifp, m, ndest, edst, ether_type)
        register struct ifnet   *ifp;
        struct mbuf             **m;
        struct sockaddr         *ndest;
        char                    *edst;
        char                    *ether_type;
{
        register struct ether_header *eh;
        int hlen;       /* link layer header lenght */
        struct arpcom *ac = IFP2AC(ifp);


        hlen = ETHER_HDR_LEN;

        /*
         * If a simplex interface, and the packet is being sent to our
         * Ethernet address or a broadcast address, loopback a copy.
         * XXX To make a simplex device behave exactly like a duplex
         * device, we should copy in the case of sending to our own
         * ethernet address (thus letting the original actually appear
         * on the wire). However, we don't do that here for security
         * reasons and compatibility with the original behavior.
         */
        if ((ifp->if_flags & IFF_SIMPLEX) &&
            ((*m)->m_flags & M_LOOP)) {
            if (lo_dlt == 0) 
                dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET, &lo_dlt);

            if (lo_dlt) {
                if ((*m)->m_flags & M_BCAST) {
                    struct mbuf *n = m_copy(*m, 0, (int)M_COPYALL);
                    dlil_output(lo_dlt, n, 0, ndest, 0);
                } 
                else 
                {
                    if (bcmp(edst,  ac->ac_enaddr, ETHER_ADDR_LEN) == 0) {
                        dlil_output(lo_dlt, *m, 0, ndest, 0);
                        return EJUSTRETURN;
                    }
                }
            }
        }


        /*
         * Add local net header.  If no space in first mbuf,
         * allocate another.
         */
        M_PREPEND(*m, sizeof (struct ether_header), M_DONTWAIT);
        if (*m == 0) {
            return (EJUSTRETURN);
        }


        eh = mtod(*m, struct ether_header *);
        (void)memcpy(&eh->ether_type, ether_type,
                sizeof(eh->ether_type));
        (void)memcpy(eh->ether_dhost, edst, 6);
        (void)memcpy(eh->ether_shost, ac->ac_enaddr,
            sizeof(eh->ether_shost));

#if DLIL_BLUEBOX
        /*
         * We're already to send.  Let's check for the blue box...
         */
        if (ifp->if_flags&IFF_SPLITTER)
        {       
            (*m)->m_flags |= 0x10;
            if ((*m = splitter_input(*m, ifp)) == NULL) 
                return EJUSTRETURN;
            else
                return (0);
        }
        else
#endif
            return 0;
}


static
int  ether_add_if(struct ifnet *ifp)
{
    u_long  i;

    ifp->if_framer = ether_frameout;
    ifp->if_demux  = ether_demux;

    for (i=0; i < MAX_INTERFACES; i++)
        if (ether_desc_blk[i].n_blocks == 0)
            break;

    if (i == MAX_INTERFACES)
        return EOVERFLOW;

    ether_desc_blk[i].block_ptr = _MALLOC(ETHER_DESC_BLK_SIZE, M_IFADDR, M_WAITOK);
    if (ether_desc_blk[i].block_ptr == 0)
        return ENOMEM;

    ether_desc_blk[i].n_blocks = 1;
    bzero(ether_desc_blk[i].block_ptr, ETHER_DESC_BLK_SIZE);

    ifp->family_cookie = i;
    
    return 0;
}

static
int  ether_del_if(struct ifnet *ifp)
{
    if ((ifp->family_cookie < MAX_INTERFACES) &&
        (ether_desc_blk[ifp->family_cookie].n_blocks)) {
        FREE(ether_desc_blk[ifp->family_cookie].block_ptr, M_IFADDR);
        ether_desc_blk[ifp->family_cookie].n_blocks = 0;
        return 0;
    }
    else
        return ENOENT;
}




int
ether_pre_output(ifp, m0, dst_netaddr, route, type, edst, dl_tag )
    struct ifnet    *ifp;
    struct mbuf     **m0;
    struct sockaddr *dst_netaddr;
    caddr_t         route;
    char            *type;
    char            *edst;
    u_long          dl_tag;
{
    struct rtentry  *rt0 = (struct rtentry *) route;
    int s;
    register struct mbuf *m = *m0;
    register struct rtentry *rt;
    register struct ether_header *eh;
    int off, len = m->m_pkthdr.len;
    int hlen;   /* link layer header lenght */
    struct arpcom *ac = IFP2AC(ifp);



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

    rt = rt0;
    if (rt) {
        if ((rt->rt_flags & RTF_UP) == 0) {
            rt0 = rt = rtalloc1(dst_netaddr, 1, 0UL);
            if (rt0)
                rt->rt_refcnt--;
            else
                return 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,
                                              0UL);
                if ((rt = rt->rt_gwroute) == 0)
                    return (EHOSTUNREACH);
            }
        }

        
        if (rt->rt_flags & RTF_REJECT)
            if (rt->rt_rmx.rmx_expire == 0 ||
                time_second < rt->rt_rmx.rmx_expire)
                return (rt == rt0 ? EHOSTDOWN : EHOSTUNREACH);
    }

    hlen = ETHER_HDR_LEN;

    /*
     * Tell ether_frameout it's ok to loop packet unless negated below.
     */
    m->m_flags |= M_LOOP;

    switch (dst_netaddr->sa_family) {

#if INET
    case AF_INET:
        if (!arpresolve(ac, rt, m, dst_netaddr, edst, rt0))
            return (EJUSTRETURN);       /* if not yet resolved */
        off = m->m_pkthdr.len - m->m_len;
        *(u_short *)type = htons(ETHERTYPE_IP);
        break;
#endif

#if INET6       
    case AF_INET6:
        if (!nd6_storelladdr(&ac->ac_if, rt, m, dst_netaddr, (u_char *)edst)) {
             /* this must be impossible, so we bark */
             kprintf("nd6_storelladdr failed\n");
             return(0);
                }
       off = m->m_pkthdr.len - m->m_len;
       *(u_short *)type = htons(ETHERTYPE_IPV6);
       break;
#endif  


    case AF_UNSPEC:
        m->m_flags &= ~M_LOOP;
        eh = (struct ether_header *)dst_netaddr->sa_data;
        (void)memcpy(edst, eh->ether_dhost, 6);
        *(u_short *)type = eh->ether_type;
        break;
        
#if NETAT
    case AF_APPLETALK:
    {
        eh = (struct ether_header *)dst_netaddr->sa_data;
        bcopy((caddr_t)eh->ether_dhost, (caddr_t)edst, 6);
                
        *(u_short *)type = m->m_pkthdr.len;
    }
    break;

#endif /* NETAT */

    default:
        kprintf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit,
               dst_netaddr->sa_family);

        return EAFNOSUPPORT;
    }

    return (0);
}





int
ether_ioctl(dl_tag, ifp, command, data)
    u_long       dl_tag;
    struct ifnet *ifp;
    int          command;
    caddr_t      data;
{
    struct ifaddr *ifa = (struct ifaddr *) data;
    struct ifreq *ifr = (struct ifreq *) data;
    int error = 0;
    boolean_t funnel_state;

    funnel_state = thread_funnel_set(TRUE);

    switch (command) {
    case SIOCSIFADDR:
        ifp->if_flags |= IFF_UP;

        switch (ifa->ifa_addr->sa_family) {

        case AF_INET:

            if (ifp->if_init)
                ifp->if_init(ifp->if_softc);    /* before arpwhohas */


            arp_ifinit(IFP2AC(ifp), ifa);

            break;

        default:
            break;
        }

        break;

    case SIOCGIFADDR:
    {
        struct sockaddr *sa;

        sa = (struct sockaddr *) & ifr->ifr_data;
        bcopy(IFP2AC(ifp)->ac_enaddr,
              (caddr_t) sa->sa_data, ETHER_ADDR_LEN);
    }
    break;

    case SIOCSIFMTU:
        /*
         * Set the interface MTU.
         */
        if (ifr->ifr_mtu > ETHERMTU) {
            error = EINVAL;
        } else {
            ifp->if_mtu = ifr->ifr_mtu;
        }
        break;
    }

    (void) thread_funnel_set(funnel_state);

    return (error);
}




/*
 * Y-adapter filter check
 * The rules here:
 *  For Rhap: return 1
 *  For Both: return 0
 *  Not for Rhap: return -1
 *  Multicast/Broadcast => For Both
 *  Atalk address registered
 *   filter matches => For Rhap else Not For Rhap
 *  IP address registered
 *   filter matches => For Rhap else Not For Rhap
 *  For Rhap
 * Note this is *not* a general filter mechanism in that we know
 *  what we *could* be looking for.
 * WARNING: this is a big-endian routine.
 * Note: ARP and AARP packets are implicitly accepted for "both"
 */
int
Filter_check(struct mbuf **m0)
{       register struct BlueFilter *bf;
        register unsigned char *p;
        register unsigned short *s;
        register unsigned long *l;
        int total, flags;
        struct mbuf *m;
        extern struct mbuf *m_pullup(struct mbuf *, int);
        extern void kprintf( const char *, ...);
#define FILTER_LEN 32

        m = *m0;
        flags = m->m_flags;
        if (FILTER_LEN > m->m_pkthdr.len)
                return(1);
        while ((FILTER_LEN > m->m_len) && m->m_next) {
                total = m->m_len + (m->m_next)->m_len;
                if ((m = m_pullup(m, min(FILTER_LEN, total))) == 0)
                        return(-1);
        }        
        *m0 = m;

        p = mtod(m, unsigned char *);   /* Point to destination media addr */
        if (p[0] & 0x01)        /* Multicast/broadcast */
                return(0);
        s = (unsigned short *)p;
        bf = &RhapFilter[BFS_ATALK];
#if 0
        kprintf("!PKT: %x, %x, %x\n", s[6], s[7],       s[8]);
#endif

        if (bf->BF_flags)       /* Filtering Appletalk */
        {
                l = (unsigned long *)&s[8];
#if 0
                kprintf("!AT: %x, %x, %x, %x, %x, %x\n", s[6], s[7],
                        *l, s[10], s[13], p[30]);
#endif
                if (s[6] <= ETHERMTU)
                {       if (s[7] == 0xaaaa) /* Could be Atalk */
                        {       /* Verify SNAP header */
                                if (*l == 0x03080007 && s[10] == 0x809b)
                                {       if (s[13] == bf->BF_address &&
                                             p[30] == bf->BF_node)
                                                return(1);
                                } else if (*l == 0x03000000 && s[10] == 0x80f3)
                                        /* AARP pkts aren't net-addressed */
                                        return(0);
                                return(0);
                        } else /* Not for us? */
                                return(0);
                } /* Fall through */
        } /* Fall through */
        bf++;                   /* Look for IP next */
        if (bf->BF_flags)       /* Filtering IP */
        {
                l = (unsigned long *)&s[15];
#if 0
                kprintf("!IP: %x, %x\n", s[6], *l);
#endif
                if (s[6] > ETHERMTU)
                {       if (s[6] == 0x800)      /* Is IP */
                        {       /* Verify IP address */
                                if (*l == bf->BF_address)
                                        return(1);
                                else    /* Not for us */
                                        return(0);
                        } else if (s[6] == 0x806)
                                /* ARP pkts aren't net-addressed */
                                return(0);
                }
        }
        return(0);              /* No filters => Accept */
}



int ether_family_init()
{

    int  i;

    if (ivedonethis)
        return 0;

    ivedonethis = 1;


    if (dlil_reg_if_modules(APPLE_IF_FAM_ETHERNET, ether_add_if, ether_del_if,
                        ether_add_proto, ether_del_proto,
                            ether_shutdown)) {
        printf("WARNING: ether_family_init -- Can't register if family modules\n");
        return EIO;
    }

    for (i=0; i < (LITMUS_SIZE/4); i++)
        litmus_mask[i] = 0xffffffff;

    for (i=0; i < MAX_INTERFACES; i++)
        ether_desc_blk[i].n_blocks = 0;

    for (i=0; i < MAX_EN_COUNT; i++)
         en_at_array[i].ifp = 0;

    return 0;
}



u_long  ether_attach_inet(struct ifnet *ifp)
{
    struct dlil_proto_reg_str   reg;
    struct dlil_demux_desc      desc;
    struct dlil_demux_desc      desc2;
#if INET6
    struct dlil_demux_desc      desc3;
#endif
    u_long                      ip_dl_tag=0;
    u_short en_native=ETHERTYPE_IP;
    u_short arp_native=ETHERTYPE_ARP;
#if INET6
    u_short en_6native=ETHERTYPE_IPV6;
#endif
    int   stat;
    int i;


    stat = dlil_find_dltag(ifp->if_family, ifp->if_unit, PF_INET, &ip_dl_tag);
    if (stat == 0)
         return ip_dl_tag;

    TAILQ_INIT(&reg.demux_desc_head);
    desc.type = DLIL_DESC_RAW;
    desc.variants.bitmask.proto_id_length = 0;
    desc.variants.bitmask.proto_id = 0;
    desc.variants.bitmask.proto_id_mask = 0;
    desc.native_type = (char *) &en_native;
    TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
    reg.interface_family = ifp->if_family;
    reg.unit_number      = ifp->if_unit;
    reg.input            = new_ether_input;
    reg.pre_output       = ether_pre_output;
    reg.event            = 0;
    reg.offer            = 0;
    reg.ioctl            = ether_ioctl;
    reg.default_proto    = 1;
    reg.protocol_family  = PF_INET;

    desc2 = desc;
    desc2.native_type = (char *) &arp_native;
    TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc2, next);

#if INET6
    desc3 = desc;
    desc3.native_type = (char *) &en_6native;
    TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc3, next);
#endif

    stat = dlil_attach_protocol(&reg, &ip_dl_tag);
    if (stat) {
        printf("WARNING: ether_attach_inet can't attach ip to interface\n");
        return stat;
    }

    return ip_dl_tag;
}

void ether_attach_at(struct ifnet *ifp, u_long *at_dl_tag, u_long *aarp_dl_tag)
{
    struct dlil_proto_reg_str   reg;
    struct dlil_demux_desc      desc;
    struct dlil_demux_desc      desc2;
    u_short native = 0;           /* 802.2 frames use a length here */
    int   stat;
    int   first_empty;
    int   i;


    first_empty = MAX_EN_COUNT;
    for (i=0; i < MAX_EN_COUNT; i++) {
         if (en_at_array[i].ifp == 0)
              first_empty = i;

         if (en_at_array[i].ifp == ifp) {
              en_at_array[i].ref_count++;
              *at_dl_tag = *aarp_dl_tag = en_at_array[i].dl_tag;
              return;
        }
    }
    
    if (first_empty == MAX_EN_COUNT)
         return;

    TAILQ_INIT(&reg.demux_desc_head);
    desc.type = DLIL_DESC_802_2_SNAP;
    desc.variants.desc_802_2_SNAP.dsap = LLC_SNAP_LSAP;
    desc.variants.desc_802_2_SNAP.ssap = LLC_SNAP_LSAP;
    desc.variants.desc_802_2_SNAP.control_code = 0x03;
    desc.variants.desc_802_2_SNAP.org[0] = 0x08;
    desc.variants.desc_802_2_SNAP.org[1] = 0x00;
    desc.variants.desc_802_2_SNAP.org[2] = 0x07;
    desc.variants.desc_802_2_SNAP.protocol_type = 0x809B;
    desc.native_type = (char *) &native;
    TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc, next);
    reg.interface_family = ifp->if_family;
    reg.unit_number      = ifp->if_unit;
    reg.input            = new_ether_input;
    reg.pre_output       = ether_pre_output;
    reg.event            = 0;
    reg.offer            = 0;
    reg.ioctl            = ether_ioctl;
    reg.default_proto    = 0;
    reg.protocol_family  = PF_APPLETALK;

    desc2 = desc;
    desc2.variants.desc_802_2_SNAP.protocol_type = 0x80F3;
    desc2.variants.desc_802_2_SNAP.org[0] = 0;
    desc2.variants.desc_802_2_SNAP.org[1] = 0;
    desc2.variants.desc_802_2_SNAP.org[2] = 0;

    TAILQ_INSERT_TAIL(&reg.demux_desc_head, &desc2, next); 

    stat = dlil_attach_protocol(&reg, at_dl_tag);
    if (stat) {
        printf("WARNING: ether_attach_at can't attach at to interface\n");
        return;
    }

    *aarp_dl_tag = *at_dl_tag;

    en_at_array[first_empty].ifp = ifp;
    en_at_array[first_empty].dl_tag = *at_dl_tag;
    en_at_array[first_empty].ref_count = 1;

} /* ether_attach_at */


void ether_detach_at(struct ifnet *ifp)
{
     int i;
     
     for (i=0; i < MAX_EN_COUNT; i++) {
          if (en_at_array[i].ifp == ifp)
               break;
     }

     if (i < MAX_EN_COUNT) {
          if (en_at_array[i].ref_count > 1) 
               en_at_array[i].ref_count--;
          else {
               if (en_at_array[i].ref_count == 1) {
                    dlil_detach_protocol(en_at_array[i].dl_tag);
                    en_at_array[i].ifp = 0;
               }
          }
     }
}