[deliverable/linux.git] / net / 802 / fc.c

/*
 * 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 <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 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);
Commit	Line	Data
1da177e4 LT	1	/*
1da177e4 LT	2	* NET3: Fibre Channel device handling subroutines
9afa0949	3	*
1da177e4 LT	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; either version
	7	* 2 of the License, or (at your option) any later version.
	8	*
	9	* Vineet Abraham <vma@iol.unh.edu>
	10	* v 1.0 03/22/99
	11	*/
	12
1da177e4 LT	13	#include <asm/uaccess.h>
	14	#include <asm/system.h>
	15	#include <linux/types.h>
	16	#include <linux/kernel.h>
1da177e4 LT	17	#include <linux/string.h>
	18	#include <linux/mm.h>
	19	#include <linux/socket.h>
	20	#include <linux/in.h>
	21	#include <linux/inet.h>
	22	#include <linux/netdevice.h>
	23	#include <linux/fcdevice.h>
	24	#include <linux/skbuff.h>
	25	#include <linux/errno.h>
	26	#include <linux/timer.h>
	27	#include <linux/net.h>
	28	#include <linux/proc_fs.h>
	29	#include <linux/init.h>
bc3b2d7f	30	#include <linux/export.h>
1da177e4 LT	31	#include <net/arp.h>
	32
	33	/*
9afa0949	34	* Put the headers on a Fibre Channel packet.
1da177e4	35	*/
9afa0949	36
1da177e4 LT	37	static int fc_header(struct sk_buff skb, struct net_device dev,
1da177e4 LT	38	unsigned short type,
3b04ddde	39	const void daddr, const void saddr, unsigned len)
1da177e4 LT	40	{
	41	struct fch_hdr *fch;
	42	int hdr_len;
	43
9afa0949 YH	44	/*
9afa0949 YH	45	* Add the 802.2 SNAP header if IP as the IPv4 code calls
1da177e4 LT	46	* dev->hard_header directly.
	47	*/
	48	if (type == ETH_P_IP \|\| type == ETH_P_ARP)
	49	{
	50	struct fcllc *fcllc;
	51
	52	hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
	53	fch = (struct fch_hdr *)skb_push(skb, hdr_len);
	54	fcllc = (struct fcllc *)(fch+1);
	55	fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
	56	fcllc->llc = UI_CMD;
	57	fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
	58	fcllc->ethertype = htons(type);
	59	}
	60	else
	61	{
	62	hdr_len = sizeof(struct fch_hdr);
9afa0949	63	fch = (struct fch_hdr *)skb_push(skb, hdr_len);
1da177e4 LT	64	}
	65
	66	if(saddr)
	67	memcpy(fch->saddr,saddr,dev->addr_len);
	68	else
	69	memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
	70
9afa0949	71	if(daddr)
1da177e4 LT	72	{
1da177e4 LT	73	memcpy(fch->daddr,daddr,dev->addr_len);
a02cec21	74	return hdr_len;
1da177e4 LT	75	}
	76	return -hdr_len;
	77	}
9afa0949	78
1da177e4 LT	79	/*
	80	* A neighbour discovery of some species (eg arp) has completed. We
	81	* can now send the packet.
	82	*/
9afa0949 YH	83
9afa0949 YH	84	static int fc_rebuild_header(struct sk_buff *skb)
1da177e4	85	{
deb28d9b	86	#ifdef CONFIG_INET
1da177e4 LT	87	struct fch_hdr fch=(struct fch_hdr )skb->data;
	88	struct fcllc fcllc=(struct fcllc )(skb->data+sizeof(struct fch_hdr));
	89	if(fcllc->ethertype != htons(ETH_P_IP)) {
57bf1451	90	printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));
1da177e4 LT	91	return 0;
1da177e4 LT	92	}
1da177e4 LT	93	return arp_find(fch->daddr, skb);
	94	#else
	95	return 0;
	96	#endif
	97	}
	98
3b04ddde SH	99	static const struct header_ops fc_header_ops = {
	100	.create = fc_header,
	101	.rebuild = fc_rebuild_header,
	102	};
	103
1da177e4 LT	104	static void fc_setup(struct net_device *dev)
1da177e4 LT	105	{
3b04ddde	106	dev->header_ops = &fc_header_ops;
1da177e4 LT	107	dev->type = ARPHRD_IEEE802;
	108	dev->hard_header_len = FC_HLEN;
	109	dev->mtu = 2024;
	110	dev->addr_len = FC_ALEN;
	111	dev->tx_queue_len = 100; /* Long queues on fc */
	112	dev->flags = IFF_BROADCAST;
	113
	114	memset(dev->broadcast, 0xFF, FC_ALEN);
	115	}
	116
	117	/**
	118	* alloc_fcdev - Register fibre channel device
	119	* @sizeof_priv: Size of additional driver-private structure to be allocated
	120	* for this fibre channel device
	121	*
	122	* Fill in the fields of the device structure with fibre channel-generic values.
	123	*
	124	* Constructs a new net device, complete with a private data area of
	125	* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
	126	* this private data area.
	127	*/
	128	struct net_device *alloc_fcdev(int sizeof_priv)
	129	{
	130	return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
	131	}
	132	EXPORT_SYMBOL(alloc_fcdev);