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 <vma@iol.unh.edu>
* 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);
}
/**
* 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);