fc.c

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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 <[email protected]>
 *      v 1.0 03/22/99
 */

#include <asm/uaccess.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 <linux/export.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 int 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)
{
#ifdef CONFIG_INET
    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;
    }
    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);
}

struct net_device *alloc_fcdev(int sizeof_priv)
{
    return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
}
EXPORT_SYMBOL(alloc_fcdev);