root/net/802/fc.c

DEFINITIONS

1. fc_header
2. fc_rebuild_header
3. fc_setup
4. alloc_fcdev

/*
 * 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);