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/*

 * INET         An implementation of the TCP/IP protocol suite for the LINUX

 *              operating system.  INET is implemented using the BSD Socket

 *              interface as the means of communication with the user level.

 *

 *              FDDI-type device handling.

 *

 * Version:     @(#)fddi.c      1.0.0   08/12/96

 *

 * Authors:     Lawrence V. Stefani, <stefani@lkg.dec.com>

 *

 *              fddi.c is based on previous eth.c and tr.c work by

 *                      Ross Biro, <bir7@leland.Stanford.Edu>

 *                      Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>

 *                      Mark Evans, <evansmp@uhura.aston.ac.uk>

 *                      Florian La Roche, <rzsfl@rz.uni-sb.de>

 *                      Alan Cox, <gw4pts@gw4pts.ampr.org>

 *

 *              This program is free software; you can redistribute it and/or

 *              modify it under the terms of the GNU General Public License

 *              as published by the Free Software Foundation; either version

 *              2 of the License, or (at your option) any later version.

 *

 *      Changes

 *              Alan Cox                :       New arp/rebuild header

 *              Maciej W. Rozycki       :       IPv6 support

 */

#include <linux/config.h>

#include <asm/segment.h>

#include <asm/system.h>

#include <linux/types.h>

#include <linux/kernel.h>

#include <linux/sched.h>

#include <linux/string.h>

#include <linux/mm.h>

#include <linux/socket.h>

#include <linux/in.h>

#include <linux/inet.h>

#include <linux/netdevice.h>

#include <linux/fddidevice.h>

#include <linux/if_ether.h>

#include <linux/skbuff.h>

#include <linux/errno.h>

#include <net/arp.h>

#include <net/sock.h>

/*

 * Create the FDDI MAC header for an arbitrary protocol layer

 *

 * saddr=NULL   means use device source address

 * daddr=NULL   means leave destination address (eg unresolved arp)

 */

int fddi_header(struct sk_buff  *skb, struct net_device *dev, unsigned short type,

                void *daddr, void *saddr, unsigned len)

{

        int hl = FDDI_K_SNAP_HLEN;

        struct fddihdr *fddi;

        if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)

                hl=FDDI_K_8022_HLEN-3;

        fddi = (struct fddihdr *)skb_push(skb, hl);

        fddi->fc                         = FDDI_FC_K_ASYNC_LLC_DEF;

        if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)

        {

                fddi->hdr.llc_snap.dsap          = FDDI_EXTENDED_SAP;

                fddi->hdr.llc_snap.ssap          = FDDI_EXTENDED_SAP;

                fddi->hdr.llc_snap.ctrl          = FDDI_UI_CMD;

                fddi->hdr.llc_snap.oui[0]         = 0x00;

                fddi->hdr.llc_snap.oui[1]        = 0x00;

                fddi->hdr.llc_snap.oui[2]        = 0x00;

                fddi->hdr.llc_snap.ethertype     = htons(type);

        }

        /* Set the source and destination hardware addresses */

        if (saddr != NULL)

                memcpy(fddi->saddr, saddr, dev->addr_len);

        else

                memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);

        if (daddr != NULL)

        {

                memcpy(fddi->daddr, daddr, dev->addr_len);

                return(hl);

        }

        return(-hl);

}

/*

 * Rebuild the FDDI MAC header. This is called after an ARP

 * (or in future other address resolution) has completed on

 * this sk_buff.  We now let ARP fill in the other fields.

 */

int fddi_rebuild_header(struct sk_buff  *skb)

{

        struct fddihdr *fddi = (struct fddihdr *)skb->data;

#ifdef CONFIG_INET

        if (fddi->hdr.llc_snap.ethertype == __constant_htons(ETH_P_IP))

                /* Try to get ARP to resolve the header and fill destination address */

                return arp_find(fddi->daddr, skb);

        else

#endif  

        {

                printk("%s: Don't know how to resolve type %02X addresses.\n",

                       skb->dev->name, htons(fddi->hdr.llc_snap.ethertype));

                return(0);

        }

}

/*

 * Determine the packet's protocol ID and fill in skb fields.

 * This routine is called before an incoming packet is passed

 * up.  It's used to fill in specific skb fields and to set

 * the proper pointer to the start of packet data (skb->data).

 */

unsigned short fddi_type_trans(struct sk_buff *skb, struct net_device *dev)

{

        struct fddihdr *fddi = (struct fddihdr *)skb->data;

        unsigned short type;

        /*

         * Set mac.raw field to point to FC byte, set data field to point

         * to start of packet data.  Assume 802.2 SNAP frames for now.

         */

        skb->mac.raw = skb->data;       /* point to frame control (FC) */

        if(fddi->hdr.llc_8022_1.dsap==0xe0)

        {

                skb_pull(skb, FDDI_K_8022_HLEN-3);

                type = __constant_htons(ETH_P_802_2);

        }

        else

        {

                skb_pull(skb, FDDI_K_SNAP_HLEN);                /* adjust for 21 byte header */

                type=fddi->hdr.llc_snap.ethertype;

        }

        /* Set packet type based on destination address and flag settings */

        if (*fddi->daddr & 0x01)

        {

                if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)

                        skb->pkt_type = PACKET_BROADCAST;

                else

                        skb->pkt_type = PACKET_MULTICAST;

        }

        else if (dev->flags & IFF_PROMISC)

        {

                if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))

                        skb->pkt_type = PACKET_OTHERHOST;

        }

        /* Assume 802.2 SNAP frames, for now */

        return(type);

}