[net-next-2.6.git] / net / 802 / hippi.c

/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		HIPPI-type device handling.
 *
 * Version:	@(#)hippi.c	1.0.0	05/29/97
 *
 * Authors:	Ross Biro
 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Mark Evans, <evansmp@uhura.aston.ac.uk>
 *		Florian  La Roche, <rzsfl@rz.uni-sb.de>
 *		Alan Cox, <gw4pts@gw4pts.ampr.org>
 *		Jes Sorensen, <Jes.Sorensen@cern.ch>
 *
 *		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.
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.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/hippidevice.h>
#include <linux/skbuff.h>
#include <linux/errno.h>
#include <net/arp.h>
#include <net/sock.h>
#include <asm/uaccess.h>
#include <asm/system.h>

/*
 * Create the HIPPI MAC header for an arbitrary protocol layer 
 *
 * saddr=NULL	means use device source address
 * daddr=NULL	means leave destination address (eg unresolved arp)
 */

static int hippi_header(struct sk_buff *skb, struct net_device *dev,
			unsigned short type, void *daddr, void *saddr,
			unsigned len)
{
	struct hippi_hdr *hip = (struct hippi_hdr *)skb_push(skb, HIPPI_HLEN);
	struct hippi_cb *hcb = (struct hippi_cb *) skb->cb;

	if (!len){
		len = skb->len - HIPPI_HLEN;
		printk("hippi_header(): length not supplied\n");
	}

	/*
	 * Due to the stupidity of the little endian byte-order we
	 * have to set the fp field this way.
	 */
	hip->fp.fixed		= __constant_htonl(0x04800018);
	hip->fp.d2_size		= htonl(len + 8);
	hip->le.fc		= 0;
	hip->le.double_wide	= 0;	/* only HIPPI 800 for the time being */
	hip->le.message_type	= 0;	/* Data PDU */

	hip->le.dest_addr_type	= 2;	/* 12 bit SC address */
	hip->le.src_addr_type	= 2;	/* 12 bit SC address */

	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
	memset(&hip->le.reserved, 0, 16);

	hip->snap.dsap		= HIPPI_EXTENDED_SAP;
	hip->snap.ssap		= HIPPI_EXTENDED_SAP;
	hip->snap.ctrl		= HIPPI_UI_CMD;
	hip->snap.oui[0]	= 0x00;
	hip->snap.oui[1]	= 0x00;
	hip->snap.oui[2]	= 0x00;
	hip->snap.ethertype	= htons(type);

	if (daddr)
	{
		memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
		memcpy(&hcb->ifield, daddr + 2, 4);
		return HIPPI_HLEN;
	}
	hcb->ifield = 0;
	return -((int)HIPPI_HLEN);
}


/*
 * Rebuild the HIPPI MAC header. This is called after an ARP has
 * completed on this sk_buff. We now let ARP fill in the other fields.
 */

static int hippi_rebuild_header(struct sk_buff *skb)
{
	struct hippi_hdr *hip = (struct hippi_hdr *)skb->data;

	/*
	 * Only IP is currently supported
	 */
	 
	if(hip->snap.ethertype != __constant_htons(ETH_P_IP)) 
	{
		printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
		return 0;
	}

	/*
	 * We don't support dynamic ARP on HIPPI, but we use the ARP
	 * static ARP tables to hold the I-FIELDs.
	 */
	return arp_find(hip->le.daddr, skb);
}


/*
 *	Determine the packet's protocol ID.
 */
 
__be16 hippi_type_trans(struct sk_buff *skb, struct net_device *dev)
{
	struct hippi_hdr *hip;
	
	hip = (struct hippi_hdr *) skb->data;

	/*
	 * This is actually wrong ... question is if we really should
	 * set the raw address here.
	 */
	 skb->mac.raw = skb->data;
	 skb_pull(skb, HIPPI_HLEN);

	/*
	 * No fancy promisc stuff here now.
	 */

	return hip->snap.ethertype;
}

EXPORT_SYMBOL(hippi_type_trans);

static int hippi_change_mtu(struct net_device *dev, int new_mtu)
{
	/*
	 * HIPPI's got these nice large MTUs.
	 */
	if ((new_mtu < 68) || (new_mtu > 65280))
		return -EINVAL;
	dev->mtu = new_mtu;
	return(0);
}

/*
 * For HIPPI we will actually use the lower 4 bytes of the hardware
 * address as the I-FIELD rather than the actual hardware address.
 */
static int hippi_mac_addr(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;
	if (netif_running(dev))
		return -EBUSY;
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	return 0;
}

static int hippi_neigh_setup_dev(struct net_device *dev, struct neigh_parms *p)
{
	/* Never send broadcast/multicast ARP messages */
	p->mcast_probes = 0;
 
	/* In IPv6 unicast probes are valid even on NBMA,
	* because they are encapsulated in normal IPv6 protocol.
	* Should be a generic flag. 
	*/
	if (p->tbl->family != AF_INET6)
		p->ucast_probes = 0;
	return 0;
}

static void hippi_setup(struct net_device *dev)
{
	dev->set_multicast_list		= NULL;
	dev->change_mtu			= hippi_change_mtu;
	dev->hard_header		= hippi_header;
	dev->rebuild_header 		= hippi_rebuild_header;
	dev->set_mac_address 		= hippi_mac_addr;
	dev->hard_header_parse		= NULL;
	dev->hard_header_cache		= NULL;
	dev->header_cache_update	= NULL;
	dev->neigh_setup 		= hippi_neigh_setup_dev; 

	/*
	 * We don't support HIPPI `ARP' for the time being, and probably
	 * never will unless someone else implements it. However we
	 * still need a fake ARPHRD to make ifconfig and friends play ball.
	 */
	dev->type		= ARPHRD_HIPPI;
	dev->hard_header_len 	= HIPPI_HLEN;
	dev->mtu		= 65280;
	dev->addr_len		= HIPPI_ALEN;
	dev->tx_queue_len	= 25 /* 5 */;
	memset(dev->broadcast, 0xFF, HIPPI_ALEN);


	/*
	 * HIPPI doesn't support broadcast+multicast and we only use
	 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. 
	 */
	dev->flags = 0; 
}

/**
 * alloc_hippi_dev - Register HIPPI device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this HIPPI device
 *
 * Fill in the fields of the device structure with HIPPI-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_hippi_dev(int sizeof_priv)
{
	return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
}

EXPORT_SYMBOL(alloc_hippi_dev);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* HIPPI-type device handling.
	7	*
	8	* Version: @(#)hippi.c 1.0.0 05/29/97
	9	*
02c30a84	10	* Authors: Ross Biro
1da177e4 LT	11	* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
	12	* Mark Evans, <evansmp@uhura.aston.ac.uk>
	13	* Florian La Roche, <rzsfl@rz.uni-sb.de>
	14	* Alan Cox, <gw4pts@gw4pts.ampr.org>
	15	* Jes Sorensen, <Jes.Sorensen@cern.ch>
	16	*
	17	* This program is free software; you can redistribute it and/or
	18	* modify it under the terms of the GNU General Public License
	19	* as published by the Free Software Foundation; either version
	20	* 2 of the License, or (at your option) any later version.
	21	*/
	22
	23	#include <linux/module.h>
	24	#include <linux/types.h>
	25	#include <linux/kernel.h>
	26	#include <linux/sched.h>
	27	#include <linux/string.h>
	28	#include <linux/mm.h>
	29	#include <linux/socket.h>
	30	#include <linux/in.h>
	31	#include <linux/inet.h>
	32	#include <linux/netdevice.h>
	33	#include <linux/hippidevice.h>
	34	#include <linux/skbuff.h>
	35	#include <linux/errno.h>
	36	#include <net/arp.h>
	37	#include <net/sock.h>
	38	#include <asm/uaccess.h>
1da177e4 LT	39	#include <asm/system.h>
	40
	41	/*
	42	* Create the HIPPI MAC header for an arbitrary protocol layer
	43	*
	44	* saddr=NULL means use device source address
	45	* daddr=NULL means leave destination address (eg unresolved arp)
	46	*/
	47
	48	static int hippi_header(struct sk_buff skb, struct net_device dev,
	49	unsigned short type, void daddr, void saddr,
	50	unsigned len)
	51	{
	52	struct hippi_hdr hip = (struct hippi_hdr )skb_push(skb, HIPPI_HLEN);
6f1cf165	53	struct hippi_cb hcb = (struct hippi_cb ) skb->cb;
1da177e4 LT	54
	55	if (!len){
	56	len = skb->len - HIPPI_HLEN;
	57	printk("hippi_header(): length not supplied\n");
	58	}
	59
	60	/*
	61	* Due to the stupidity of the little endian byte-order we
	62	* have to set the fp field this way.
	63	*/
	64	hip->fp.fixed = __constant_htonl(0x04800018);
	65	hip->fp.d2_size = htonl(len + 8);
	66	hip->le.fc = 0;
	67	hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
	68	hip->le.message_type = 0; /* Data PDU */
	69
	70	hip->le.dest_addr_type = 2; /* 12 bit SC address */
	71	hip->le.src_addr_type = 2; /* 12 bit SC address */
	72
	73	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
	74	memset(&hip->le.reserved, 0, 16);
	75
	76	hip->snap.dsap = HIPPI_EXTENDED_SAP;
	77	hip->snap.ssap = HIPPI_EXTENDED_SAP;
	78	hip->snap.ctrl = HIPPI_UI_CMD;
	79	hip->snap.oui[0] = 0x00;
	80	hip->snap.oui[1] = 0x00;
	81	hip->snap.oui[2] = 0x00;
	82	hip->snap.ethertype = htons(type);
	83
	84	if (daddr)
	85	{
	86	memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
6f1cf165	87	memcpy(&hcb->ifield, daddr + 2, 4);
1da177e4 LT	88	return HIPPI_HLEN;
1da177e4 LT	89	}
6f1cf165	90	hcb->ifield = 0;
1da177e4 LT	91	return -((int)HIPPI_HLEN);
	92	}
	93
	94
	95	/*
	96	* Rebuild the HIPPI MAC header. This is called after an ARP has
	97	* completed on this sk_buff. We now let ARP fill in the other fields.
	98	*/
	99
	100	static int hippi_rebuild_header(struct sk_buff *skb)
	101	{
	102	struct hippi_hdr hip = (struct hippi_hdr )skb->data;
	103
	104	/*
	105	* Only IP is currently supported
	106	*/
	107
	108	if(hip->snap.ethertype != __constant_htons(ETH_P_IP))
	109	{
	110	printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
	111	return 0;
	112	}
	113
	114	/*
	115	* We don't support dynamic ARP on HIPPI, but we use the ARP
	116	* static ARP tables to hold the I-FIELDs.
	117	*/
	118	return arp_find(hip->le.daddr, skb);
	119	}
	120
	121
	122	/*
	123	* Determine the packet's protocol ID.
	124	*/
	125
57bf1451	126	__be16 hippi_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	127	{
	128	struct hippi_hdr *hip;
	129
	130	hip = (struct hippi_hdr *) skb->data;
	131
	132	/*
	133	* This is actually wrong ... question is if we really should
	134	* set the raw address here.
	135	*/
	136	skb->mac.raw = skb->data;
	137	skb_pull(skb, HIPPI_HLEN);
	138
	139	/*
	140	* No fancy promisc stuff here now.
	141	*/
	142
	143	return hip->snap.ethertype;
	144	}
	145
	146	EXPORT_SYMBOL(hippi_type_trans);
	147
	148	static int hippi_change_mtu(struct net_device *dev, int new_mtu)
	149	{
	150	/*
	151	* HIPPI's got these nice large MTUs.
	152	*/
	153	if ((new_mtu < 68) \|\| (new_mtu > 65280))
	154	return -EINVAL;
	155	dev->mtu = new_mtu;
	156	return(0);
	157	}
	158
	159	/*
	160	* For HIPPI we will actually use the lower 4 bytes of the hardware
	161	* address as the I-FIELD rather than the actual hardware address.
	162	*/
	163	static int hippi_mac_addr(struct net_device dev, void p)
	164	{
	165	struct sockaddr *addr = p;
	166	if (netif_running(dev))
	167	return -EBUSY;
	168	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	169	return 0;
	170	}
	171
	172	static int hippi_neigh_setup_dev(struct net_device dev, struct neigh_parms p)
	173	{
	174	/* Never send broadcast/multicast ARP messages */
	175	p->mcast_probes = 0;
	176
	177	/* In IPv6 unicast probes are valid even on NBMA,
	178	* because they are encapsulated in normal IPv6 protocol.
	179	* Should be a generic flag.
	180	*/
	181	if (p->tbl->family != AF_INET6)
	182	p->ucast_probes = 0;
	183	return 0;
	184	}
	185
	186	static void hippi_setup(struct net_device *dev)
	187	{
	188	dev->set_multicast_list = NULL;
	189	dev->change_mtu = hippi_change_mtu;
	190	dev->hard_header = hippi_header;
191	dev->rebuild_header = hippi_rebuild_header;
192	dev->set_mac_address = hippi_mac_addr;
193	dev->hard_header_parse = NULL;
194	dev->hard_header_cache = NULL;
195	dev->header_cache_update = NULL;
196	dev->neigh_setup = hippi_neigh_setup_dev;
197
198	/*
199	* We don't support HIPPI `ARP' for the time being, and probably
200	* never will unless someone else implements it. However we
201	* still need a fake ARPHRD to make ifconfig and friends play ball.
202	*/
203	dev->type = ARPHRD_HIPPI;
204	dev->hard_header_len = HIPPI_HLEN;
205	dev->mtu = 65280;
206	dev->addr_len = HIPPI_ALEN;
207	dev->tx_queue_len = 25 /* 5 */;
208	memset(dev->broadcast, 0xFF, HIPPI_ALEN);
209
210
211	/*
212	* HIPPI doesn't support broadcast+multicast and we only use
213	* static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
214	*/
215	dev->flags = 0;
216	}
217
218	/**
219	* alloc_hippi_dev - Register HIPPI device
220	* @sizeof_priv: Size of additional driver-private structure to be allocated
221	* for this HIPPI device
222	*
223	* Fill in the fields of the device structure with HIPPI-generic values.
224	*
225	* Constructs a new net device, complete with a private data area of
226	* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
227	* this private data area.
228	*/
229
230	struct net_device *alloc_hippi_dev(int sizeof_priv)
231	{
232	return alloc_netdev(sizeof_priv, "hip%d", hippi_setup);
233	}
234
235	EXPORT_SYMBOL(alloc_hippi_dev);