[linux.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, <[email protected]>
 *		Mark Evans, <[email protected]>
 *		Florian  La Roche, <[email protected]>
 *		Alan Cox, <[email protected]>
 *		Jes Sorensen, <[email protected]>
 *
 *		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/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,
			const void *daddr, const 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		= 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 != 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;

	/*
	 * This is actually wrong ... question is if we really should
	 * set the raw address here.
	 */
	skb->dev = dev;
	skb_reset_mac_header(skb);
	hip = (struct hippi_hdr *)skb_mac_header(skb);
	skb_pull(skb, HIPPI_HLEN);

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

	return hip->snap.ethertype;
}

EXPORT_SYMBOL(hippi_type_trans);

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;
}
EXPORT_SYMBOL(hippi_change_mtu);

/*
 * For HIPPI we will actually use the lower 4 bytes of the hardware
 * address as the I-FIELD rather than the actual hardware address.
 */
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;
}
EXPORT_SYMBOL(hippi_mac_addr);

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;
}
EXPORT_SYMBOL(hippi_neigh_setup_dev);

static const struct header_ops hippi_header_ops = {
	.create		= hippi_header,
	.rebuild	= hippi_rebuild_header,
};


static void hippi_setup(struct net_device *dev)
{
	dev->header_ops			= &hippi_header_ops;

	/*
	 * 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, <[email protected]>
	12	* Mark Evans, <[email protected]>
	13	* Florian La Roche, <[email protected]>
	14	* Alan Cox, <[email protected]>
	15	* Jes Sorensen, <[email protected]>
	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>
1da177e4 LT	26	#include <linux/string.h>
	27	#include <linux/mm.h>
	28	#include <linux/socket.h>
	29	#include <linux/in.h>
	30	#include <linux/inet.h>
	31	#include <linux/netdevice.h>
	32	#include <linux/hippidevice.h>
	33	#include <linux/skbuff.h>
	34	#include <linux/errno.h>
	35	#include <net/arp.h>
	36	#include <net/sock.h>
	37	#include <asm/uaccess.h>
1da177e4 LT	38	#include <asm/system.h>
	39
	40	/*
9afa0949	41	* Create the HIPPI MAC header for an arbitrary protocol layer
1da177e4 LT	42	*
	43	* saddr=NULL means use device source address
	44	* daddr=NULL means leave destination address (eg unresolved arp)
	45	*/
	46
	47	static int hippi_header(struct sk_buff skb, struct net_device dev,
3b04ddde SH	48	unsigned short type,
3b04ddde SH	49	const void daddr, const void saddr, unsigned len)
1da177e4 LT	50	{
1da177e4 LT	51	struct hippi_hdr hip = (struct hippi_hdr )skb_push(skb, HIPPI_HLEN);
6f1cf165	52	struct hippi_cb hcb = (struct hippi_cb ) skb->cb;
1da177e4 LT	53
	54	if (!len){
	55	len = skb->len - HIPPI_HLEN;
	56	printk("hippi_header(): length not supplied\n");
	57	}
	58
	59	/*
	60	* Due to the stupidity of the little endian byte-order we
	61	* have to set the fp field this way.
	62	*/
2953fd24	63	hip->fp.fixed = htonl(0x04800018);
1da177e4 LT	64	hip->fp.d2_size = htonl(len + 8);
	65	hip->le.fc = 0;
	66	hip->le.double_wide = 0; /* only HIPPI 800 for the time being */
	67	hip->le.message_type = 0; /* Data PDU */
	68
	69	hip->le.dest_addr_type = 2; /* 12 bit SC address */
	70	hip->le.src_addr_type = 2; /* 12 bit SC address */
	71
	72	memcpy(hip->le.src_switch_addr, dev->dev_addr + 3, 3);
	73	memset(&hip->le.reserved, 0, 16);
	74
	75	hip->snap.dsap = HIPPI_EXTENDED_SAP;
	76	hip->snap.ssap = HIPPI_EXTENDED_SAP;
	77	hip->snap.ctrl = HIPPI_UI_CMD;
	78	hip->snap.oui[0] = 0x00;
	79	hip->snap.oui[1] = 0x00;
	80	hip->snap.oui[2] = 0x00;
	81	hip->snap.ethertype = htons(type);
	82
	83	if (daddr)
	84	{
	85	memcpy(hip->le.dest_switch_addr, daddr + 3, 3);
6f1cf165	86	memcpy(&hcb->ifield, daddr + 2, 4);
1da177e4 LT	87	return HIPPI_HLEN;
1da177e4 LT	88	}
6f1cf165	89	hcb->ifield = 0;
1da177e4 LT	90	return -((int)HIPPI_HLEN);
	91	}
	92
	93
	94	/*
	95	* Rebuild the HIPPI MAC header. This is called after an ARP has
	96	* completed on this sk_buff. We now let ARP fill in the other fields.
	97	*/
	98
	99	static int hippi_rebuild_header(struct sk_buff *skb)
	100	{
	101	struct hippi_hdr hip = (struct hippi_hdr )skb->data;
	102
	103	/*
	104	* Only IP is currently supported
	105	*/
9afa0949	106
2953fd24	107	if(hip->snap.ethertype != htons(ETH_P_IP))
1da177e4 LT	108	{
	109	printk(KERN_DEBUG "%s: unable to resolve type %X addresses.\n",skb->dev->name,ntohs(hip->snap.ethertype));
	110	return 0;
	111	}
	112
	113	/*
	114	* We don't support dynamic ARP on HIPPI, but we use the ARP
	115	* static ARP tables to hold the I-FIELDs.
	116	*/
	117	return arp_find(hip->le.daddr, skb);
	118	}
	119
	120
	121	/*
	122	* Determine the packet's protocol ID.
	123	*/
9afa0949	124
57bf1451	125	__be16 hippi_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4 LT	126	{
1da177e4 LT	127	struct hippi_hdr *hip;
9afa0949	128
1da177e4 LT	129	/*
	130	* This is actually wrong ... question is if we really should
	131	* set the raw address here.
	132	*/
0a4f23fb	133	skb->dev = dev;
459a98ed	134	skb_reset_mac_header(skb);
98e399f8	135	hip = (struct hippi_hdr *)skb_mac_header(skb);
0a4f23fb	136	skb_pull(skb, HIPPI_HLEN);
1da177e4 LT	137
	138	/*
	139	* No fancy promisc stuff here now.
	140	*/
	141
	142	return hip->snap.ethertype;
	143	}
	144
	145	EXPORT_SYMBOL(hippi_type_trans);
	146
748ff68f	147	int hippi_change_mtu(struct net_device *dev, int new_mtu)
1da177e4 LT	148	{
	149	/*
	150	* HIPPI's got these nice large MTUs.
	151	*/
	152	if ((new_mtu < 68) \|\| (new_mtu > 65280))
	153	return -EINVAL;
	154	dev->mtu = new_mtu;
a02cec21	155	return 0;
1da177e4	156	}
748ff68f	157	EXPORT_SYMBOL(hippi_change_mtu);
1da177e4 LT	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	*/
748ff68f	163	int hippi_mac_addr(struct net_device dev, void p)
1da177e4 LT	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	}
748ff68f	171	EXPORT_SYMBOL(hippi_mac_addr);
1da177e4	172
748ff68f	173	int hippi_neigh_setup_dev(struct net_device dev, struct neigh_parms p)
1da177e4 LT	174	{
	175	/* Never send broadcast/multicast ARP messages */
	176	p->mcast_probes = 0;
9afa0949	177
1da177e4 LT	178	/* In IPv6 unicast probes are valid even on NBMA,
1da177e4 LT	179	* because they are encapsulated in normal IPv6 protocol.
9afa0949	180	* Should be a generic flag.
1da177e4 LT	181	*/
	182	if (p->tbl->family != AF_INET6)
	183	p->ucast_probes = 0;
	184	return 0;
	185	}
748ff68f	186	EXPORT_SYMBOL(hippi_neigh_setup_dev);
1da177e4	187
3b04ddde SH	188	static const struct header_ops hippi_header_ops = {
	189	.create = hippi_header,
	190	.rebuild = hippi_rebuild_header,
	191	};
	192
	193
1da177e4 LT	194	static void hippi_setup(struct net_device *dev)
1da177e4 LT	195	{
748ff68f	196	dev->header_ops = &hippi_header_ops;
1da177e4 LT	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
9afa0949	213	* static ARP tables. ARP is disabled by hippi_neigh_setup_dev.
1da177e4	214	*/
9afa0949	215	dev->flags = 0;
1da177e4 LT	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);