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/*

 * NET3:        Fibre Channel device handling subroutines

 *

 *              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.

 *

 *              Vineet Abraham <vma@iol.unh.edu>

 *              v 1.0 03/22/99

 */

#include <asm/uaccess.h>

#include <asm/system.h>

#include <linux/types.h>

#include <linux/kernel.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/fcdevice.h>

#include <linux/skbuff.h>

#include <linux/errno.h>

#include <linux/timer.h>

#include <linux/net.h>

#include <linux/proc_fs.h>

#include <linux/init.h>

#include <net/arp.h>

/*

 *      Put the headers on a Fibre Channel packet.

 */

static int fc_header(struct sk_buff *skb, struct net_device *dev,

                     unsigned short type,

                     const void *daddr, const void *saddr, unsigned len)

{

        struct fch_hdr *fch;

        int hdr_len;

        /*

         * Add the 802.2 SNAP header if IP as the IPv4 code calls

         * dev->hard_header directly.

         */

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

        {

                struct fcllc *fcllc;

                hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);

                fch = (struct fch_hdr *)skb_push(skb, hdr_len);

                fcllc = (struct fcllc *)(fch+1);

                fcllc->dsap = fcllc->ssap = EXTENDED_SAP;

                fcllc->llc = UI_CMD;

                fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;

                fcllc->ethertype = htons(type);

        }

        else

        {

                hdr_len = sizeof(struct fch_hdr);

                fch = (struct fch_hdr *)skb_push(skb, hdr_len);

        }

        if(saddr)

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

        else

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

        if(daddr)

        {

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

                return(hdr_len);

        }

        return -hdr_len;

}

/*

 *      A neighbour discovery of some species (eg arp) has completed. We

 *      can now send the packet.

 */

static int fc_rebuild_header(struct sk_buff *skb)

{

        struct fch_hdr *fch=(struct fch_hdr *)skb->data;

        struct fcllc *fcllc=(struct fcllc *)(skb->data+sizeof(struct fch_hdr));

        if(fcllc->ethertype != htons(ETH_P_IP)) {

                printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));

                return 0;

        }

#ifdef CONFIG_INET

        return arp_find(fch->daddr, skb);

#else

        return 0;

#endif

}

static const struct header_ops fc_header_ops = {

        .create  = fc_header,

        .rebuild = fc_rebuild_header,

};

static void fc_setup(struct net_device *dev)

{

        dev->header_ops         = &fc_header_ops;

        dev->type               = ARPHRD_IEEE802;

        dev->hard_header_len    = FC_HLEN;

        dev->mtu                = 2024;

        dev->addr_len           = FC_ALEN;

        dev->tx_queue_len       = 100; /* Long queues on fc */

        dev->flags              = IFF_BROADCAST;

        memset(dev->broadcast, 0xFF, FC_ALEN);

}

/**

 * alloc_fcdev - Register fibre channel device

 * @sizeof_priv: Size of additional driver-private structure to be allocated

 *      for this fibre channel device

 *

 * Fill in the fields of the device structure with fibre channel-generic values.

 *

 * Constructs a new net device, complete with a private data area of

 * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for

 * this private data area.

 */

struct net_device *alloc_fcdev(int sizeof_priv)

{

        return alloc_netdev(sizeof_priv, "fc%d", fc_setup);

}

EXPORT_SYMBOL(alloc_fcdev);