[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 <[email protected]>
 *		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)
{
#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 <[email protected]>
	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>
	30	#include <net/arp.h>
	31
	32	/*
9afa0949	33	* Put the headers on a Fibre Channel packet.
1da177e4	34	*/
9afa0949	35
1da177e4 LT	36	static int fc_header(struct sk_buff skb, struct net_device dev,
1da177e4 LT	37	unsigned short type,
3b04ddde	38	const void daddr, const void saddr, unsigned len)
1da177e4 LT	39	{
	40	struct fch_hdr *fch;
	41	int hdr_len;
	42
9afa0949 YH	43	/*
9afa0949 YH	44	* Add the 802.2 SNAP header if IP as the IPv4 code calls
1da177e4 LT	45	* dev->hard_header directly.
	46	*/
	47	if (type == ETH_P_IP \|\| type == ETH_P_ARP)
	48	{
	49	struct fcllc *fcllc;
	50
	51	hdr_len = sizeof(struct fch_hdr) + sizeof(struct fcllc);
	52	fch = (struct fch_hdr *)skb_push(skb, hdr_len);
	53	fcllc = (struct fcllc *)(fch+1);
	54	fcllc->dsap = fcllc->ssap = EXTENDED_SAP;
	55	fcllc->llc = UI_CMD;
	56	fcllc->protid[0] = fcllc->protid[1] = fcllc->protid[2] = 0x00;
	57	fcllc->ethertype = htons(type);
	58	}
	59	else
	60	{
	61	hdr_len = sizeof(struct fch_hdr);
9afa0949	62	fch = (struct fch_hdr *)skb_push(skb, hdr_len);
1da177e4 LT	63	}
	64
	65	if(saddr)
	66	memcpy(fch->saddr,saddr,dev->addr_len);
	67	else
	68	memcpy(fch->saddr,dev->dev_addr,dev->addr_len);
	69
9afa0949	70	if(daddr)
1da177e4 LT	71	{
1da177e4 LT	72	memcpy(fch->daddr,daddr,dev->addr_len);
a02cec21	73	return hdr_len;
1da177e4 LT	74	}
	75	return -hdr_len;
	76	}
9afa0949	77
1da177e4 LT	78	/*
	79	* A neighbour discovery of some species (eg arp) has completed. We
	80	* can now send the packet.
	81	*/
9afa0949 YH	82
9afa0949 YH	83	static int fc_rebuild_header(struct sk_buff *skb)
1da177e4	84	{
deb28d9b	85	#ifdef CONFIG_INET
1da177e4 LT	86	struct fch_hdr fch=(struct fch_hdr )skb->data;
	87	struct fcllc fcllc=(struct fcllc )(skb->data+sizeof(struct fch_hdr));
	88	if(fcllc->ethertype != htons(ETH_P_IP)) {
57bf1451	89	printk("fc_rebuild_header: Don't know how to resolve type %04X addresses ?\n", ntohs(fcllc->ethertype));
1da177e4 LT	90	return 0;
1da177e4 LT	91	}
1da177e4 LT	92	return arp_find(fch->daddr, skb);
	93	#else
	94	return 0;
	95	#endif
	96	}
	97
3b04ddde SH	98	static const struct header_ops fc_header_ops = {
	99	.create = fc_header,
	100	.rebuild = fc_rebuild_header,
	101	};
	102
1da177e4 LT	103	static void fc_setup(struct net_device *dev)
1da177e4 LT	104	{
3b04ddde	105	dev->header_ops = &fc_header_ops;
1da177e4 LT	106	dev->type = ARPHRD_IEEE802;
	107	dev->hard_header_len = FC_HLEN;
	108	dev->mtu = 2024;
	109	dev->addr_len = FC_ALEN;
	110	dev->tx_queue_len = 100; /* Long queues on fc */
	111	dev->flags = IFF_BROADCAST;
	112
	113	memset(dev->broadcast, 0xFF, FC_ALEN);
	114	}
	115
	116	/**
	117	* alloc_fcdev - Register fibre channel device
	118	* @sizeof_priv: Size of additional driver-private structure to be allocated
	119	* for this fibre channel device
	120	*
	121	* Fill in the fields of the device structure with fibre channel-generic values.
	122	*
	123	* Constructs a new net device, complete with a private data area of
	124	* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
	125	* this private data area.
	126	*/
	127	struct net_device *alloc_fcdev(int sizeof_priv)
	128	{
	129	return alloc_netdev(sizeof_priv, "fc%d", fc_setup);
	130	}
	131	EXPORT_SYMBOL(alloc_fcdev);