[net-next-2.6.git] / drivers / net / wan / lapbether.c

/*
 *	"LAPB via ethernet" driver release 001
 *
 *	This code REQUIRES 2.1.15 or higher/ NET3.038
 *
 *	This module:
 *		This module 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.
 *
 *	This is a "pseudo" network driver to allow LAPB over Ethernet.
 *
 *	This driver can use any ethernet destination address, and can be 
 *	limited to accept frames from one dedicated ethernet card only.
 *
 *	History
 *	LAPBETH 001	Jonathan Naylor		Cloned from bpqether.c
 *	2000-10-29	Henner Eisen	lapb_data_indication() return status.
 *	2000-11-14	Henner Eisen	dev_hold/put, NETDEV_GOING_DOWN support
 */

#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/net.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <asm/system.h>
#include <asm/uaccess.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <linux/stat.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/lapb.h>
#include <linux/init.h>

#include <net/x25device.h>

static char bcast_addr[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };

/* If this number is made larger, check that the temporary string buffer
 * in lapbeth_new_device is large enough to store the probe device name.*/
#define MAXLAPBDEV 100

struct lapbethdev {
	struct list_head	node;
	struct net_device	*ethdev;	/* link to ethernet device */
	struct net_device	*axdev;		/* lapbeth device (lapb#) */
	struct net_device_stats stats;		/* some statistics */
};

static struct list_head lapbeth_devices = LIST_HEAD_INIT(lapbeth_devices);

/* ------------------------------------------------------------------------ */

/*
 *	Get the LAPB device for the ethernet device
 */
static struct lapbethdev *lapbeth_get_x25_dev(struct net_device *dev)
{
	struct lapbethdev *lapbeth;

	list_for_each_entry_rcu(lapbeth, &lapbeth_devices, node) {
		if (lapbeth->ethdev == dev) 
			return lapbeth;
	}
	return NULL;
}

static __inline__ int dev_is_ethdev(struct net_device *dev)
{
	return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
}

/* ------------------------------------------------------------------------ */

/*
 *	Receive a LAPB frame via an ethernet interface.
 */
static int lapbeth_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *ptype, struct net_device *orig_dev)
{
	int len, err;
	struct lapbethdev *lapbeth;

	if (dev_net(dev) != &init_net)
		goto drop;

	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
		return NET_RX_DROP;

	if (!pskb_may_pull(skb, 2))
		goto drop;

	rcu_read_lock();
	lapbeth = lapbeth_get_x25_dev(dev);
	if (!lapbeth)
		goto drop_unlock;
	if (!netif_running(lapbeth->axdev))
		goto drop_unlock;

	lapbeth->stats.rx_packets++;

	len = skb->data[0] + skb->data[1] * 256;
	lapbeth->stats.rx_bytes += len;

	skb_pull(skb, 2);	/* Remove the length bytes */
	skb_trim(skb, len);	/* Set the length of the data */

	if ((err = lapb_data_received(lapbeth->axdev, skb)) != LAPB_OK) {
		printk(KERN_DEBUG "lapbether: lapb_data_received err - %d\n", err);
		goto drop_unlock;
	}
out:
	rcu_read_unlock();
	return 0;
drop_unlock:
	kfree_skb(skb);
	goto out;
drop:
	kfree_skb(skb);
	return 0;
}

static int lapbeth_data_indication(struct net_device *dev, struct sk_buff *skb)
{
	unsigned char *ptr;

	skb_push(skb, 1);

	if (skb_cow(skb, 1))
		return NET_RX_DROP;

	ptr  = skb->data;
	*ptr = 0x00;

	skb->protocol = x25_type_trans(skb, dev);
	skb->dev->last_rx = jiffies;
	return netif_rx(skb);
}

/*
 *	Send a LAPB frame via an ethernet interface
 */
static int lapbeth_xmit(struct sk_buff *skb, struct net_device *dev)
{
	int err = -ENODEV;

	/*
	 * Just to be *really* sure not to send anything if the interface
	 * is down, the ethernet device may have gone.
	 */
	if (!netif_running(dev)) {
		goto drop;
	}

	switch (skb->data[0]) {
	case 0x00:
		err = 0;
		break;
	case 0x01:
		if ((err = lapb_connect_request(dev)) != LAPB_OK)
			printk(KERN_ERR "lapbeth: lapb_connect_request "
			       "error: %d\n", err);
		goto drop_ok;
	case 0x02:
		if ((err = lapb_disconnect_request(dev)) != LAPB_OK)
			printk(KERN_ERR "lapbeth: lapb_disconnect_request "
			       "err: %d\n", err);
		/* Fall thru */
	default:
		goto drop_ok;
	}

	skb_pull(skb, 1);

	if ((err = lapb_data_request(dev, skb)) != LAPB_OK) {
		printk(KERN_ERR "lapbeth: lapb_data_request error - %d\n", err);
		err = -ENOMEM;
		goto drop;
	}
	err = 0;
out:
	return err;
drop_ok:
	err = 0;
drop:
	kfree_skb(skb);
	goto out;
}

static void lapbeth_data_transmit(struct net_device *ndev, struct sk_buff *skb)
{
	struct lapbethdev *lapbeth = netdev_priv(ndev);
	unsigned char *ptr;
	struct net_device *dev;
	int size = skb->len;

	skb->protocol = htons(ETH_P_X25);

	ptr = skb_push(skb, 2);

	*ptr++ = size % 256;
	*ptr++ = size / 256;

	lapbeth->stats.tx_packets++;
	lapbeth->stats.tx_bytes += size;

	skb->dev = dev = lapbeth->ethdev;

	dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);

	dev_queue_xmit(skb);
}

static void lapbeth_connected(struct net_device *dev, int reason)
{
	unsigned char *ptr;
	struct sk_buff *skb = dev_alloc_skb(1);

	if (!skb) {
		printk(KERN_ERR "lapbeth: out of memory\n");
		return;
	}

	ptr  = skb_put(skb, 1);
	*ptr = 0x01;

	skb->protocol = x25_type_trans(skb, dev);
	skb->dev->last_rx = jiffies;
	netif_rx(skb);
}

static void lapbeth_disconnected(struct net_device *dev, int reason)
{
	unsigned char *ptr;
	struct sk_buff *skb = dev_alloc_skb(1);

	if (!skb) {
		printk(KERN_ERR "lapbeth: out of memory\n");
		return;
	}

	ptr  = skb_put(skb, 1);
	*ptr = 0x02;

	skb->protocol = x25_type_trans(skb, dev);
	skb->dev->last_rx = jiffies;
	netif_rx(skb);
}

/*
 *	Statistics
 */
static struct net_device_stats *lapbeth_get_stats(struct net_device *dev)
{
	struct lapbethdev *lapbeth = netdev_priv(dev);
	return &lapbeth->stats;
}

/*
 *	Set AX.25 callsign
 */
static int lapbeth_set_mac_address(struct net_device *dev, void *addr)
{
	struct sockaddr *sa = addr;
	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	return 0;
}


static struct lapb_register_struct lapbeth_callbacks = {
	.connect_confirmation    = lapbeth_connected,
	.connect_indication      = lapbeth_connected,
	.disconnect_confirmation = lapbeth_disconnected,
	.disconnect_indication   = lapbeth_disconnected,
	.data_indication         = lapbeth_data_indication,
	.data_transmit           = lapbeth_data_transmit,

};

/*
 * open/close a device
 */
static int lapbeth_open(struct net_device *dev)
{
	int err;

	if ((err = lapb_register(dev, &lapbeth_callbacks)) != LAPB_OK) {
		printk(KERN_ERR "lapbeth: lapb_register error - %d\n", err);
		return -ENODEV;
	}

	netif_start_queue(dev);
	return 0;
}

static int lapbeth_close(struct net_device *dev)
{
	int err;

	netif_stop_queue(dev);

	if ((err = lapb_unregister(dev)) != LAPB_OK)
		printk(KERN_ERR "lapbeth: lapb_unregister error - %d\n", err);

	return 0;
}

/* ------------------------------------------------------------------------ */

static void lapbeth_setup(struct net_device *dev)
{
	dev->hard_start_xmit = lapbeth_xmit;
	dev->open	     = lapbeth_open;
	dev->stop	     = lapbeth_close;
	dev->destructor	     = free_netdev;
	dev->set_mac_address = lapbeth_set_mac_address;
	dev->get_stats	     = lapbeth_get_stats;
	dev->type            = ARPHRD_X25;
	dev->hard_header_len = 3;
	dev->mtu             = 1000;
	dev->addr_len        = 0;
}

/*
 *	Setup a new device.
 */
static int lapbeth_new_device(struct net_device *dev)
{
	struct net_device *ndev;
	struct lapbethdev *lapbeth;
	int rc = -ENOMEM;

	ASSERT_RTNL();

	ndev = alloc_netdev(sizeof(*lapbeth), "lapb%d", 
			   lapbeth_setup);
	if (!ndev)
		goto out;

	lapbeth = netdev_priv(ndev);
	lapbeth->axdev = ndev;

	dev_hold(dev);
	lapbeth->ethdev = dev;

	rc = dev_alloc_name(ndev, ndev->name);
	if (rc < 0) 
		goto fail;

	rc = -EIO;
	if (register_netdevice(ndev))
		goto fail;

	list_add_rcu(&lapbeth->node, &lapbeth_devices);
	rc = 0;
out:
	return rc;
fail:
	dev_put(dev);
	free_netdev(ndev);
	kfree(lapbeth);
	goto out;
}

/*
 *	Free a lapb network device.
 */
static void lapbeth_free_device(struct lapbethdev *lapbeth)
{
	dev_put(lapbeth->ethdev);
	list_del_rcu(&lapbeth->node);
	unregister_netdevice(lapbeth->axdev);
}

/*
 *	Handle device status changes.
 *
 * Called from notifier with RTNL held.
 */
static int lapbeth_device_event(struct notifier_block *this,
				unsigned long event, void *ptr)
{
	struct lapbethdev *lapbeth;
	struct net_device *dev = ptr;

	if (dev_net(dev) != &init_net)
		return NOTIFY_DONE;

	if (!dev_is_ethdev(dev))
		return NOTIFY_DONE;

	switch (event) {
	case NETDEV_UP:
		/* New ethernet device -> new LAPB interface	 */
		if (lapbeth_get_x25_dev(dev) == NULL)
			lapbeth_new_device(dev);
		break;
	case NETDEV_DOWN:	
		/* ethernet device closed -> close LAPB interface */
		lapbeth = lapbeth_get_x25_dev(dev);
		if (lapbeth) 
			dev_close(lapbeth->axdev);
		break;
	case NETDEV_UNREGISTER:
		/* ethernet device disappears -> remove LAPB interface */
		lapbeth = lapbeth_get_x25_dev(dev);
		if (lapbeth)
			lapbeth_free_device(lapbeth);
		break;
	}

	return NOTIFY_DONE;
}

/* ------------------------------------------------------------------------ */

static struct packet_type lapbeth_packet_type = {
	.type = __constant_htons(ETH_P_DEC),
	.func = lapbeth_rcv,
};

static struct notifier_block lapbeth_dev_notifier = {
	.notifier_call = lapbeth_device_event,
};

static char banner[] __initdata = KERN_INFO "LAPB Ethernet driver version 0.02\n";

static int __init lapbeth_init_driver(void)
{
	dev_add_pack(&lapbeth_packet_type);

	register_netdevice_notifier(&lapbeth_dev_notifier);

	printk(banner);

	return 0;
}
module_init(lapbeth_init_driver);

static void __exit lapbeth_cleanup_driver(void)
{
	struct lapbethdev *lapbeth;
	struct list_head *entry, *tmp;

	dev_remove_pack(&lapbeth_packet_type);
	unregister_netdevice_notifier(&lapbeth_dev_notifier);

	rtnl_lock();
	list_for_each_safe(entry, tmp, &lapbeth_devices) {
		lapbeth = list_entry(entry, struct lapbethdev, node);

		unregister_netdevice(lapbeth->axdev);
	}
	rtnl_unlock();
}
module_exit(lapbeth_cleanup_driver);

MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
MODULE_DESCRIPTION("The unofficial LAPB over Ethernet driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* "LAPB via ethernet" driver release 001
	3	*
	4	* This code REQUIRES 2.1.15 or higher/ NET3.038
	5	*
	6	* This module:
	7	* This module is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*
	12	* This is a "pseudo" network driver to allow LAPB over Ethernet.
	13	*
	14	* This driver can use any ethernet destination address, and can be
	15	* limited to accept frames from one dedicated ethernet card only.
	16	*
	17	* History
	18	* LAPBETH 001 Jonathan Naylor Cloned from bpqether.c
	19	* 2000-10-29 Henner Eisen lapb_data_indication() return status.
	20	* 2000-11-14 Henner Eisen dev_hold/put, NETDEV_GOING_DOWN support
	21	*/
	22
	23	#include <linux/errno.h>
	24	#include <linux/types.h>
	25	#include <linux/socket.h>
	26	#include <linux/in.h>
	27	#include <linux/kernel.h>
	28	#include <linux/string.h>
	29	#include <linux/net.h>
	30	#include <linux/inet.h>
	31	#include <linux/netdevice.h>
	32	#include <linux/if_arp.h>
	33	#include <linux/skbuff.h>
	34	#include <net/sock.h>
	35	#include <asm/system.h>
	36	#include <asm/uaccess.h>
	37	#include <linux/mm.h>
	38	#include <linux/interrupt.h>
	39	#include <linux/notifier.h>
	40	#include <linux/stat.h>
	41	#include <linux/netfilter.h>
	42	#include <linux/module.h>
	43	#include <linux/lapb.h>
	44	#include <linux/init.h>
	45
	46	#include <net/x25device.h>
	47
	48	static char bcast_addr[6] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
	49
	50	/* If this number is made larger, check that the temporary string buffer
	51	* in lapbeth_new_device is large enough to store the probe device name.*/
	52	#define MAXLAPBDEV 100
	53
	54	struct lapbethdev {
	55	struct list_head node;
	56	struct net_device ethdev; / link to ethernet device */
	57	struct net_device axdev; / lapbeth device (lapb#) */
	58	struct net_device_stats stats; /* some statistics */
	59	};
	60
	61	static struct list_head lapbeth_devices = LIST_HEAD_INIT(lapbeth_devices);
	62
	63	/* ------------------------------------------------------------------------ */
	64
65	/*
66	* Get the LAPB device for the ethernet device
67	*/
68	static struct lapbethdev lapbeth_get_x25_dev(struct net_device dev)
69	{
70	struct lapbethdev *lapbeth;
71
72	list_for_each_entry_rcu(lapbeth, &lapbeth_devices, node) {
73	if (lapbeth->ethdev == dev)
74	return lapbeth;
75	}
76	return NULL;
77	}
78
79	static __inline__ int dev_is_ethdev(struct net_device *dev)
80	{
81	return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);
82	}
83
84	/* ------------------------------------------------------------------------ */
85
86	/*
87	* Receive a LAPB frame via an ethernet interface.
88	*/
f2ccd8fa	89	static int lapbeth_rcv(struct sk_buff skb, struct net_device dev, struct packet_type ptype, struct net_device orig_dev)
1da177e4 LT	90	{
	91	int len, err;
	92	struct lapbethdev *lapbeth;
	93
c346dca1	94	if (dev_net(dev) != &init_net)
e730c155 EB	95	goto drop;
e730c155 EB	96
1da177e4 LT	97	if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL)
	98	return NET_RX_DROP;
	99
	100	if (!pskb_may_pull(skb, 2))
	101	goto drop;
	102
	103	rcu_read_lock();
	104	lapbeth = lapbeth_get_x25_dev(dev);
	105	if (!lapbeth)
	106	goto drop_unlock;
	107	if (!netif_running(lapbeth->axdev))
	108	goto drop_unlock;
	109
	110	lapbeth->stats.rx_packets++;
	111
	112	len = skb->data[0] + skb->data[1] * 256;
	113	lapbeth->stats.rx_bytes += len;
	114
	115	skb_pull(skb, 2); /* Remove the length bytes */
	116	skb_trim(skb, len); /* Set the length of the data */
	117
	118	if ((err = lapb_data_received(lapbeth->axdev, skb)) != LAPB_OK) {
	119	printk(KERN_DEBUG "lapbether: lapb_data_received err - %d\n", err);
	120	goto drop_unlock;
	121	}
	122	out:
	123	rcu_read_unlock();
	124	return 0;
	125	drop_unlock:
	126	kfree_skb(skb);
	127	goto out;
	128	drop:
	129	kfree_skb(skb);
	130	return 0;
	131	}
	132
	133	static int lapbeth_data_indication(struct net_device dev, struct sk_buff skb)
	134	{
	135	unsigned char *ptr;
	136
	137	skb_push(skb, 1);
	138
	139	if (skb_cow(skb, 1))
	140	return NET_RX_DROP;
	141
	142	ptr = skb->data;
	143	*ptr = 0x00;
	144
	145	skb->protocol = x25_type_trans(skb, dev);
	146	skb->dev->last_rx = jiffies;
	147	return netif_rx(skb);
	148	}
	149
	150	/*
	151	* Send a LAPB frame via an ethernet interface
	152	*/
	153	static int lapbeth_xmit(struct sk_buff skb, struct net_device dev)
	154	{
	155	int err = -ENODEV;
	156
	157	/*
	158	* Just to be really sure not to send anything if the interface
	159	* is down, the ethernet device may have gone.
	160	*/
161	if (!netif_running(dev)) {
162	goto drop;
163	}
164
165	switch (skb->data[0]) {
166	case 0x00:
167	err = 0;
168	break;
169	case 0x01:
170	if ((err = lapb_connect_request(dev)) != LAPB_OK)
171	printk(KERN_ERR "lapbeth: lapb_connect_request "
172	"error: %d\n", err);
173	goto drop_ok;
174	case 0x02:
175	if ((err = lapb_disconnect_request(dev)) != LAPB_OK)
176	printk(KERN_ERR "lapbeth: lapb_disconnect_request "
177	"err: %d\n", err);
178	/* Fall thru */
179	default:
180	goto drop_ok;
181	}
182
183	skb_pull(skb, 1);
184
185	if ((err = lapb_data_request(dev, skb)) != LAPB_OK) {
186	printk(KERN_ERR "lapbeth: lapb_data_request error - %d\n", err);
187	err = -ENOMEM;
188	goto drop;
189	}
190	err = 0;
191	out:
192	return err;
193	drop_ok:
194	err = 0;
195	drop:
196	kfree_skb(skb);
197	goto out;
198	}
199
200	static void lapbeth_data_transmit(struct net_device ndev, struct sk_buff skb)
201	{
202	struct lapbethdev *lapbeth = netdev_priv(ndev);
203	unsigned char *ptr;
204	struct net_device *dev;
205	int size = skb->len;
206
207	skb->protocol = htons(ETH_P_X25);
208
209	ptr = skb_push(skb, 2);
210
211	*ptr++ = size % 256;
212	*ptr++ = size / 256;
213
214	lapbeth->stats.tx_packets++;
215	lapbeth->stats.tx_bytes += size;
216
217	skb->dev = dev = lapbeth->ethdev;
218
0c4e8581	219	dev_hard_header(skb, dev, ETH_P_DEC, bcast_addr, NULL, 0);
1da177e4 LT	220
	221	dev_queue_xmit(skb);
	222	}
	223
	224	static void lapbeth_connected(struct net_device *dev, int reason)
	225	{
	226	unsigned char *ptr;
	227	struct sk_buff *skb = dev_alloc_skb(1);
	228
	229	if (!skb) {
	230	printk(KERN_ERR "lapbeth: out of memory\n");
	231	return;
	232	}
	233
	234	ptr = skb_put(skb, 1);
	235	*ptr = 0x01;
	236
	237	skb->protocol = x25_type_trans(skb, dev);
	238	skb->dev->last_rx = jiffies;
	239	netif_rx(skb);
	240	}
	241
	242	static void lapbeth_disconnected(struct net_device *dev, int reason)
	243	{
	244	unsigned char *ptr;
	245	struct sk_buff *skb = dev_alloc_skb(1);
	246
	247	if (!skb) {
	248	printk(KERN_ERR "lapbeth: out of memory\n");
	249	return;
	250	}
	251
	252	ptr = skb_put(skb, 1);
	253	*ptr = 0x02;
	254
	255	skb->protocol = x25_type_trans(skb, dev);
	256	skb->dev->last_rx = jiffies;
	257	netif_rx(skb);
	258	}
	259
	260	/*
	261	* Statistics
	262	*/
	263	static struct net_device_stats lapbeth_get_stats(struct net_device dev)
	264	{
	265	struct lapbethdev *lapbeth = netdev_priv(dev);
	266	return &lapbeth->stats;
	267	}
	268
	269	/*
	270	* Set AX.25 callsign
	271	*/
	272	static int lapbeth_set_mac_address(struct net_device dev, void addr)
	273	{
	274	struct sockaddr *sa = addr;
	275	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
	276	return 0;
	277	}
	278
	279
	280	static struct lapb_register_struct lapbeth_callbacks = {
	281	.connect_confirmation = lapbeth_connected,
	282	.connect_indication = lapbeth_connected,
	283	.disconnect_confirmation = lapbeth_disconnected,
284	.disconnect_indication = lapbeth_disconnected,
285	.data_indication = lapbeth_data_indication,
286	.data_transmit = lapbeth_data_transmit,
287
288	};
289
290	/*
291	* open/close a device
292	*/
293	static int lapbeth_open(struct net_device *dev)
294	{
295	int err;
296
297	if ((err = lapb_register(dev, &lapbeth_callbacks)) != LAPB_OK) {
298	printk(KERN_ERR "lapbeth: lapb_register error - %d\n", err);
299	return -ENODEV;
300	}
301
302	netif_start_queue(dev);
303	return 0;
304	}
305
306	static int lapbeth_close(struct net_device *dev)
307	{
308	int err;
309
310	netif_stop_queue(dev);
311
312	if ((err = lapb_unregister(dev)) != LAPB_OK)
313	printk(KERN_ERR "lapbeth: lapb_unregister error - %d\n", err);
314
315	return 0;
316	}
317
318	/* ------------------------------------------------------------------------ */
319
320	static void lapbeth_setup(struct net_device *dev)
321	{
322	dev->hard_start_xmit = lapbeth_xmit;
323	dev->open = lapbeth_open;
324	dev->stop = lapbeth_close;
325	dev->destructor = free_netdev;
326	dev->set_mac_address = lapbeth_set_mac_address;
327	dev->get_stats = lapbeth_get_stats;
328	dev->type = ARPHRD_X25;
329	dev->hard_header_len = 3;
330	dev->mtu = 1000;
331	dev->addr_len = 0;
1da177e4 LT	332	}
	333
	334	/*
	335	* Setup a new device.
	336	*/
	337	static int lapbeth_new_device(struct net_device *dev)
	338	{
	339	struct net_device *ndev;
	340	struct lapbethdev *lapbeth;
	341	int rc = -ENOMEM;
	342
	343	ASSERT_RTNL();
	344
	345	ndev = alloc_netdev(sizeof(*lapbeth), "lapb%d",
	346	lapbeth_setup);
	347	if (!ndev)
	348	goto out;
	349
	350	lapbeth = netdev_priv(ndev);
	351	lapbeth->axdev = ndev;
	352
	353	dev_hold(dev);
	354	lapbeth->ethdev = dev;
	355
	356	rc = dev_alloc_name(ndev, ndev->name);
	357	if (rc < 0)
	358	goto fail;
	359
	360	rc = -EIO;
	361	if (register_netdevice(ndev))
	362	goto fail;
	363
	364	list_add_rcu(&lapbeth->node, &lapbeth_devices);
	365	rc = 0;
	366	out:
	367	return rc;
	368	fail:
	369	dev_put(dev);
	370	free_netdev(ndev);
	371	kfree(lapbeth);
	372	goto out;
	373	}
	374
	375	/*
	376	* Free a lapb network device.
	377	*/
	378	static void lapbeth_free_device(struct lapbethdev *lapbeth)
	379	{
	380	dev_put(lapbeth->ethdev);
	381	list_del_rcu(&lapbeth->node);
	382	unregister_netdevice(lapbeth->axdev);
	383	}
	384
	385	/*
	386	* Handle device status changes.
	387	*
	388	* Called from notifier with RTNL held.
	389	*/
	390	static int lapbeth_device_event(struct notifier_block *this,
	391	unsigned long event, void *ptr)
	392	{
	393	struct lapbethdev *lapbeth;
	394	struct net_device *dev = ptr;
	395
c346dca1	396	if (dev_net(dev) != &init_net)
e9dc8653 EB	397	return NOTIFY_DONE;
e9dc8653 EB	398
1da177e4 LT	399	if (!dev_is_ethdev(dev))
	400	return NOTIFY_DONE;
	401
	402	switch (event) {
	403	case NETDEV_UP:
	404	/* New ethernet device -> new LAPB interface */
	405	if (lapbeth_get_x25_dev(dev) == NULL)
	406	lapbeth_new_device(dev);
	407	break;
	408	case NETDEV_DOWN:
	409	/* ethernet device closed -> close LAPB interface */
	410	lapbeth = lapbeth_get_x25_dev(dev);
	411	if (lapbeth)
	412	dev_close(lapbeth->axdev);
	413	break;
	414	case NETDEV_UNREGISTER:
	415	/* ethernet device disappears -> remove LAPB interface */
	416	lapbeth = lapbeth_get_x25_dev(dev);
	417	if (lapbeth)
	418	lapbeth_free_device(lapbeth);
	419	break;
	420	}
	421
	422	return NOTIFY_DONE;
	423	}
	424
	425	/* ------------------------------------------------------------------------ */
	426
	427	static struct packet_type lapbeth_packet_type = {
	428	.type = __constant_htons(ETH_P_DEC),
	429	.func = lapbeth_rcv,
	430	};
	431
	432	static struct notifier_block lapbeth_dev_notifier = {
	433	.notifier_call = lapbeth_device_event,
	434	};
	435
	436	static char banner[] __initdata = KERN_INFO "LAPB Ethernet driver version 0.02\n";
	437
	438	static int __init lapbeth_init_driver(void)
	439	{
	440	dev_add_pack(&lapbeth_packet_type);
	441
	442	register_netdevice_notifier(&lapbeth_dev_notifier);
	443
	444	printk(banner);
	445
	446	return 0;
	447	}
	448	module_init(lapbeth_init_driver);
	449
	450	static void __exit lapbeth_cleanup_driver(void)
	451	{
	452	struct lapbethdev *lapbeth;
	453	struct list_head entry, tmp;
	454
	455	dev_remove_pack(&lapbeth_packet_type);
	456	unregister_netdevice_notifier(&lapbeth_dev_notifier);
	457
	458	rtnl_lock();
	459	list_for_each_safe(entry, tmp, &lapbeth_devices) {
	460	lapbeth = list_entry(entry, struct lapbethdev, node);
	461
	462	unregister_netdevice(lapbeth->axdev);
463	}
464	rtnl_unlock();
465	}
466	module_exit(lapbeth_cleanup_driver);
467
468	MODULE_AUTHOR("Jonathan Naylor <g4klx@g4klx.demon.co.uk>");
469	MODULE_DESCRIPTION("The unofficial LAPB over Ethernet driver");
470	MODULE_LICENSE("GPL");