[deliverable/linux.git] / drivers / net / wan / hdlc.c

/*
 * Generic HDLC support routines for Linux
 *
 * Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License
 * as published by the Free Software Foundation.
 *
 * Currently supported:
 *	* raw IP-in-HDLC
 *	* Cisco HDLC
 *	* Frame Relay with ANSI or CCITT LMI (both user and network side)
 *	* PPP
 *	* X.25
 *
 * Use sethdlc utility to set line parameters, protocol and PVCs
 *
 * How does it work:
 * - proto->open(), close(), start(), stop() calls are serialized.
 *   The order is: open, [ start, stop ... ] close ...
 * - proto->start() and stop() are called with spin_lock_irq held.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/pkt_sched.h>
#include <linux/inetdevice.h>
#include <linux/lapb.h>
#include <linux/rtnetlink.h>
#include <linux/notifier.h>
#include <linux/hdlc.h>
#include <net/net_namespace.h>


static const char* version = "HDLC support module revision 1.21";

#undef DEBUG_LINK

static struct hdlc_proto *first_proto = NULL;


static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
{
	if ((new_mtu < 68) || (new_mtu > HDLC_MAX_MTU))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}


static struct net_device_stats *hdlc_get_stats(struct net_device *dev)
{
	return hdlc_stats(dev);
}


static int hdlc_rcv(struct sk_buff *skb, struct net_device *dev,
		    struct packet_type *p, struct net_device *orig_dev)
{
	struct hdlc_device_desc *desc = dev_to_desc(dev);

	if (dev->nd_net != &init_net) {
		kfree_skb(skb);
		return 0;
	}

	if (desc->netif_rx)
		return desc->netif_rx(skb);

	desc->stats.rx_dropped++; /* Shouldn't happen */
	dev_kfree_skb(skb);
	return NET_RX_DROP;
}


static inline void hdlc_proto_start(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	if (hdlc->proto->start)
		return hdlc->proto->start(dev);
}


static inline void hdlc_proto_stop(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	if (hdlc->proto->stop)
		return hdlc->proto->stop(dev);
}


static int hdlc_device_event(struct notifier_block *this, unsigned long event,
			     void *ptr)
{
	struct net_device *dev = ptr;
	hdlc_device *hdlc;
	unsigned long flags;
	int on;
 
	if (dev->get_stats != hdlc_get_stats)
		return NOTIFY_DONE; /* not an HDLC device */
 
	if (event != NETDEV_CHANGE)
		return NOTIFY_DONE; /* Only interrested in carrier changes */

	on = netif_carrier_ok(dev);

#ifdef DEBUG_LINK
	printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n",
	       dev->name, on);
#endif

	hdlc = dev_to_hdlc(dev);
	spin_lock_irqsave(&hdlc->state_lock, flags);

	if (hdlc->carrier == on)
		goto carrier_exit; /* no change in DCD line level */

	hdlc->carrier = on;

	if (!hdlc->open)
		goto carrier_exit;

	if (hdlc->carrier) {
		printk(KERN_INFO "%s: Carrier detected\n", dev->name);
		hdlc_proto_start(dev);
	} else {
		printk(KERN_INFO "%s: Carrier lost\n", dev->name);
		hdlc_proto_stop(dev);
	}

carrier_exit:
	spin_unlock_irqrestore(&hdlc->state_lock, flags);
	return NOTIFY_DONE;
}


/* Must be called by hardware driver when HDLC device is being opened */
int hdlc_open(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
#ifdef DEBUG_LINK
	printk(KERN_DEBUG "%s: hdlc_open() carrier %i open %i\n", dev->name,
	       hdlc->carrier, hdlc->open);
#endif

	if (hdlc->proto == NULL)
		return -ENOSYS;	/* no protocol attached */

	if (hdlc->proto->open) {
		int result = hdlc->proto->open(dev);
		if (result)
			return result;
	}

	spin_lock_irq(&hdlc->state_lock);

	if (hdlc->carrier) {
		printk(KERN_INFO "%s: Carrier detected\n", dev->name);
		hdlc_proto_start(dev);
	} else
		printk(KERN_INFO "%s: No carrier\n", dev->name);

	hdlc->open = 1;

	spin_unlock_irq(&hdlc->state_lock);
	return 0;
}


/* Must be called by hardware driver when HDLC device is being closed */
void hdlc_close(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
#ifdef DEBUG_LINK
	printk(KERN_DEBUG "%s: hdlc_close() carrier %i open %i\n", dev->name,
	       hdlc->carrier, hdlc->open);
#endif

	spin_lock_irq(&hdlc->state_lock);

	hdlc->open = 0;
	if (hdlc->carrier)
		hdlc_proto_stop(dev);

	spin_unlock_irq(&hdlc->state_lock);

	if (hdlc->proto->close)
		hdlc->proto->close(dev);
}


int hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct hdlc_proto *proto = first_proto;
	int result;

	if (cmd != SIOCWANDEV)
		return -EINVAL;

	if (dev_to_hdlc(dev)->proto) {
		result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr);
		if (result != -EINVAL)
			return result;
	}

	/* Not handled by currently attached protocol (if any) */

	while (proto) {
		if ((result = proto->ioctl(dev, ifr)) != -EINVAL)
			return result;
		proto = proto->next;
	}
	return -EINVAL;
}

static void hdlc_setup_dev(struct net_device *dev)
{
	/* Re-init all variables changed by HDLC protocol drivers,
	 * including ether_setup() called from hdlc_raw_eth.c.
	 */
	dev->get_stats		 = hdlc_get_stats;
	dev->flags		 = IFF_POINTOPOINT | IFF_NOARP;
	dev->mtu		 = HDLC_MAX_MTU;
	dev->type		 = ARPHRD_RAWHDLC;
	dev->hard_header_len	 = 16;
	dev->addr_len		 = 0;
	dev->hard_header	 = NULL;
	dev->rebuild_header	 = NULL;
	dev->set_mac_address	 = NULL;
	dev->hard_header_cache	 = NULL;
	dev->header_cache_update = NULL;
	dev->change_mtu		 = hdlc_change_mtu;
	dev->hard_header_parse	 = NULL;
}

static void hdlc_setup(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);

	hdlc_setup_dev(dev);
	hdlc->carrier = 1;
	hdlc->open = 0;
	spin_lock_init(&hdlc->state_lock);
}

struct net_device *alloc_hdlcdev(void *priv)
{
	struct net_device *dev;
	dev = alloc_netdev(sizeof(struct hdlc_device_desc) +
			   sizeof(hdlc_device), "hdlc%d", hdlc_setup);
	if (dev)
		dev_to_hdlc(dev)->priv = priv;
	return dev;
}

void unregister_hdlc_device(struct net_device *dev)
{
	rtnl_lock();
	unregister_netdevice(dev);
	detach_hdlc_protocol(dev);
	rtnl_unlock();
}


int attach_hdlc_protocol(struct net_device *dev, struct hdlc_proto *proto,
			 int (*rx)(struct sk_buff *skb), size_t size)
{
	detach_hdlc_protocol(dev);

	if (!try_module_get(proto->module))
		return -ENOSYS;

	if (size)
		if ((dev_to_hdlc(dev)->state = kmalloc(size,
						       GFP_KERNEL)) == NULL) {
			printk(KERN_WARNING "Memory squeeze on"
			       " hdlc_proto_attach()\n");
			module_put(proto->module);
			return -ENOBUFS;
		}
	dev_to_hdlc(dev)->proto = proto;
	dev_to_desc(dev)->netif_rx = rx;
	return 0;
}


void detach_hdlc_protocol(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);

	if (hdlc->proto) {
		if (hdlc->proto->detach)
			hdlc->proto->detach(dev);
		module_put(hdlc->proto->module);
		hdlc->proto = NULL;
	}
	kfree(hdlc->state);
	hdlc->state = NULL;
	hdlc_setup_dev(dev);
}


void register_hdlc_protocol(struct hdlc_proto *proto)
{
	proto->next = first_proto;
	first_proto = proto;
}


void unregister_hdlc_protocol(struct hdlc_proto *proto)
{
	struct hdlc_proto **p = &first_proto;
	while (*p) {
		if (*p == proto) {
			*p = proto->next;
			return;
		}
		p = &((*p)->next);
	}
}


MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("HDLC support module");
MODULE_LICENSE("GPL v2");

EXPORT_SYMBOL(hdlc_open);
EXPORT_SYMBOL(hdlc_close);
EXPORT_SYMBOL(hdlc_ioctl);
EXPORT_SYMBOL(alloc_hdlcdev);
EXPORT_SYMBOL(unregister_hdlc_device);
EXPORT_SYMBOL(register_hdlc_protocol);
EXPORT_SYMBOL(unregister_hdlc_protocol);
EXPORT_SYMBOL(attach_hdlc_protocol);
EXPORT_SYMBOL(detach_hdlc_protocol);

static struct packet_type hdlc_packet_type = {
	.type = __constant_htons(ETH_P_HDLC),
	.func = hdlc_rcv,
};


static struct notifier_block hdlc_notifier = {
        .notifier_call = hdlc_device_event,
};


static int __init hdlc_module_init(void)
{
	int result;

	printk(KERN_INFO "%s\n", version);
	if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0)
                return result;
        dev_add_pack(&hdlc_packet_type);
	return 0;
}


static void __exit hdlc_module_exit(void)
{
	dev_remove_pack(&hdlc_packet_type);
	unregister_netdevice_notifier(&hdlc_notifier);
}


module_init(hdlc_module_init);
module_exit(hdlc_module_exit);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic HDLC support routines for Linux
	3	*
eb2a2fd9	4	* Copyright (C) 1999 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
1da177e4 LT	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of version 2 of the GNU General Public License
	8	* as published by the Free Software Foundation.
	9	*
	10	* Currently supported:
	11	* * raw IP-in-HDLC
	12	* * Cisco HDLC
	13	* * Frame Relay with ANSI or CCITT LMI (both user and network side)
	14	* * PPP
	15	* * X.25
	16	*
	17	* Use sethdlc utility to set line parameters, protocol and PVCs
	18	*
	19	* How does it work:
eb2a2fd9	20	* - proto->open(), close(), start(), stop() calls are serialized.
1da177e4	21	* The order is: open, [ start, stop ... ] close ...
eb2a2fd9	22	* - proto->start() and stop() are called with spin_lock_irq held.
1da177e4 LT	23	*/
1da177e4 LT	24
1da177e4 LT	25	#include <linux/module.h>
	26	#include <linux/kernel.h>
	27	#include <linux/slab.h>
	28	#include <linux/poll.h>
	29	#include <linux/errno.h>
	30	#include <linux/if_arp.h>
	31	#include <linux/init.h>
	32	#include <linux/skbuff.h>
	33	#include <linux/pkt_sched.h>
	34	#include <linux/inetdevice.h>
	35	#include <linux/lapb.h>
	36	#include <linux/rtnetlink.h>
c2ce9204	37	#include <linux/notifier.h>
1da177e4	38	#include <linux/hdlc.h>
e730c155	39	#include <net/net_namespace.h>
1da177e4 LT	40
1da177e4 LT	41
b5284e5a	42	static const char* version = "HDLC support module revision 1.21";
1da177e4 LT	43
	44	#undef DEBUG_LINK
	45
eb2a2fd9 KH	46	static struct hdlc_proto *first_proto = NULL;
eb2a2fd9 KH	47
1da177e4 LT	48
	49	static int hdlc_change_mtu(struct net_device *dev, int new_mtu)
	50	{
	51	if ((new_mtu < 68) \|\| (new_mtu > HDLC_MAX_MTU))
	52	return -EINVAL;
	53	dev->mtu = new_mtu;
	54	return 0;
	55	}
	56
	57
	58
	59	static struct net_device_stats hdlc_get_stats(struct net_device dev)
	60	{
	61	return hdlc_stats(dev);
	62	}
	63
	64
	65
	66	static int hdlc_rcv(struct sk_buff skb, struct net_device dev,
f2ccd8fa	67	struct packet_type p, struct net_device orig_dev)
1da177e4	68	{
eb2a2fd9	69	struct hdlc_device_desc *desc = dev_to_desc(dev);
e730c155 EB	70
	71	if (dev->nd_net != &init_net) {
	72	kfree_skb(skb);
	73	return 0;
	74	}
	75
eb2a2fd9 KH	76	if (desc->netif_rx)
eb2a2fd9 KH	77	return desc->netif_rx(skb);
1da177e4	78
eb2a2fd9	79	desc->stats.rx_dropped++; /* Shouldn't happen */
1da177e4 LT	80	dev_kfree_skb(skb);
	81	return NET_RX_DROP;
	82	}
	83
	84
	85
c2ce9204	86	static inline void hdlc_proto_start(struct net_device *dev)
1da177e4 LT	87	{
1da177e4 LT	88	hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9 KH	89	if (hdlc->proto->start)
eb2a2fd9 KH	90	return hdlc->proto->start(dev);
1da177e4 LT	91	}
	92
	93
	94
c2ce9204	95	static inline void hdlc_proto_stop(struct net_device *dev)
1da177e4 LT	96	{
1da177e4 LT	97	hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9 KH	98	if (hdlc->proto->stop)
eb2a2fd9 KH	99	return hdlc->proto->stop(dev);
1da177e4 LT	100	}
	101
	102
	103
c2ce9204 KH	104	static int hdlc_device_event(struct notifier_block *this, unsigned long event,
c2ce9204 KH	105	void *ptr)
1da177e4	106	{
c2ce9204 KH	107	struct net_device *dev = ptr;
c2ce9204 KH	108	hdlc_device *hdlc;
1da177e4	109	unsigned long flags;
c2ce9204 KH	110	int on;
	111
	112	if (dev->get_stats != hdlc_get_stats)
	113	return NOTIFY_DONE; /* not an HDLC device */
	114
	115	if (event != NETDEV_CHANGE)
	116	return NOTIFY_DONE; /* Only interrested in carrier changes */
	117
	118	on = netif_carrier_ok(dev);
1da177e4 LT	119
1da177e4 LT	120	#ifdef DEBUG_LINK
c2ce9204 KH	121	printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n",
c2ce9204 KH	122	dev->name, on);
1da177e4 LT	123	#endif
1da177e4 LT	124
c2ce9204	125	hdlc = dev_to_hdlc(dev);
1da177e4 LT	126	spin_lock_irqsave(&hdlc->state_lock, flags);
	127
	128	if (hdlc->carrier == on)
	129	goto carrier_exit; /* no change in DCD line level */
	130
1da177e4 LT	131	hdlc->carrier = on;
	132
	133	if (!hdlc->open)
	134	goto carrier_exit;
	135
b3dd65f9 KH	136	if (hdlc->carrier) {
b3dd65f9 KH	137	printk(KERN_INFO "%s: Carrier detected\n", dev->name);
c2ce9204	138	hdlc_proto_start(dev);
b3dd65f9 KH	139	} else {
b3dd65f9 KH	140	printk(KERN_INFO "%s: Carrier lost\n", dev->name);
c2ce9204	141	hdlc_proto_stop(dev);
b3dd65f9	142	}
1da177e4 LT	143
	144	carrier_exit:
	145	spin_unlock_irqrestore(&hdlc->state_lock, flags);
c2ce9204	146	return NOTIFY_DONE;
1da177e4 LT	147	}
	148
	149
	150
	151	/* Must be called by hardware driver when HDLC device is being opened */
	152	int hdlc_open(struct net_device *dev)
	153	{
	154	hdlc_device *hdlc = dev_to_hdlc(dev);
	155	#ifdef DEBUG_LINK
eb2a2fd9	156	printk(KERN_DEBUG "%s: hdlc_open() carrier %i open %i\n", dev->name,
1da177e4 LT	157	hdlc->carrier, hdlc->open);
	158	#endif
	159
eb2a2fd9	160	if (hdlc->proto == NULL)
1da177e4 LT	161	return -ENOSYS; /* no protocol attached */
1da177e4 LT	162
eb2a2fd9 KH	163	if (hdlc->proto->open) {
eb2a2fd9 KH	164	int result = hdlc->proto->open(dev);
1da177e4 LT	165	if (result)
	166	return result;
	167	}
	168
	169	spin_lock_irq(&hdlc->state_lock);
	170
b3dd65f9 KH	171	if (hdlc->carrier) {
b3dd65f9 KH	172	printk(KERN_INFO "%s: Carrier detected\n", dev->name);
c2ce9204	173	hdlc_proto_start(dev);
b3dd65f9 KH	174	} else
b3dd65f9 KH	175	printk(KERN_INFO "%s: No carrier\n", dev->name);
1da177e4 LT	176
	177	hdlc->open = 1;
	178
	179	spin_unlock_irq(&hdlc->state_lock);
	180	return 0;
	181	}
	182
	183
	184
	185	/* Must be called by hardware driver when HDLC device is being closed */
	186	void hdlc_close(struct net_device *dev)
	187	{
	188	hdlc_device *hdlc = dev_to_hdlc(dev);
	189	#ifdef DEBUG_LINK
eb2a2fd9	190	printk(KERN_DEBUG "%s: hdlc_close() carrier %i open %i\n", dev->name,
1da177e4 LT	191	hdlc->carrier, hdlc->open);
	192	#endif
	193
	194	spin_lock_irq(&hdlc->state_lock);
	195
	196	hdlc->open = 0;
	197	if (hdlc->carrier)
c2ce9204	198	hdlc_proto_stop(dev);
1da177e4 LT	199
	200	spin_unlock_irq(&hdlc->state_lock);
	201
eb2a2fd9 KH	202	if (hdlc->proto->close)
eb2a2fd9 KH	203	hdlc->proto->close(dev);
1da177e4 LT	204	}
	205
	206
	207
1da177e4 LT	208	int hdlc_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
1da177e4 LT	209	{
eb2a2fd9 KH	210	struct hdlc_proto *proto = first_proto;
eb2a2fd9 KH	211	int result;
1da177e4 LT	212
	213	if (cmd != SIOCWANDEV)
	214	return -EINVAL;
	215
eb2a2fd9 KH	216	if (dev_to_hdlc(dev)->proto) {
	217	result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr);
	218	if (result != -EINVAL)
	219	return result;
1da177e4 LT	220	}
1da177e4 LT	221
eb2a2fd9 KH	222	/* Not handled by currently attached protocol (if any) */
	223
	224	while (proto) {
	225	if ((result = proto->ioctl(dev, ifr)) != -EINVAL)
	226	return result;
	227	proto = proto->next;
1da177e4	228	}
eb2a2fd9	229	return -EINVAL;
1da177e4 LT	230	}
1da177e4 LT	231
b5284e5a KH	232	static void hdlc_setup_dev(struct net_device *dev)
	233	{
	234	/* Re-init all variables changed by HDLC protocol drivers,
	235	* including ether_setup() called from hdlc_raw_eth.c.
	236	*/
	237	dev->get_stats = hdlc_get_stats;
	238	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
	239	dev->mtu = HDLC_MAX_MTU;
	240	dev->type = ARPHRD_RAWHDLC;
	241	dev->hard_header_len = 16;
	242	dev->addr_len = 0;
	243	dev->hard_header = NULL;
	244	dev->rebuild_header = NULL;
	245	dev->set_mac_address = NULL;
	246	dev->hard_header_cache = NULL;
	247	dev->header_cache_update = NULL;
	248	dev->change_mtu = hdlc_change_mtu;
	249	dev->hard_header_parse = NULL;
	250	}
	251
0bf94faf	252	static void hdlc_setup(struct net_device *dev)
1da177e4 LT	253	{
	254	hdlc_device *hdlc = dev_to_hdlc(dev);
	255
b5284e5a	256	hdlc_setup_dev(dev);
1da177e4 LT	257	hdlc->carrier = 1;
	258	hdlc->open = 0;
	259	spin_lock_init(&hdlc->state_lock);
	260	}
	261
	262	struct net_device alloc_hdlcdev(void priv)
	263	{
	264	struct net_device *dev;
eb2a2fd9 KH	265	dev = alloc_netdev(sizeof(struct hdlc_device_desc) +
eb2a2fd9 KH	266	sizeof(hdlc_device), "hdlc%d", hdlc_setup);
1da177e4 LT	267	if (dev)
	268	dev_to_hdlc(dev)->priv = priv;
	269	return dev;
	270	}
	271
1da177e4 LT	272	void unregister_hdlc_device(struct net_device *dev)
	273	{
	274	rtnl_lock();
1da177e4	275	unregister_netdevice(dev);
eb2a2fd9	276	detach_hdlc_protocol(dev);
1da177e4 LT	277	rtnl_unlock();
	278	}
	279
	280
	281
eb2a2fd9 KH	282	int attach_hdlc_protocol(struct net_device dev, struct hdlc_proto proto,
	283	int (rx)(struct sk_buff skb), size_t size)
	284	{
	285	detach_hdlc_protocol(dev);
	286
	287	if (!try_module_get(proto->module))
	288	return -ENOSYS;
	289
	290	if (size)
	291	if ((dev_to_hdlc(dev)->state = kmalloc(size,
	292	GFP_KERNEL)) == NULL) {
	293	printk(KERN_WARNING "Memory squeeze on"
	294	" hdlc_proto_attach()\n");
	295	module_put(proto->module);
	296	return -ENOBUFS;
	297	}
	298	dev_to_hdlc(dev)->proto = proto;
	299	dev_to_desc(dev)->netif_rx = rx;
	300	return 0;
	301	}
	302
	303
	304	void detach_hdlc_protocol(struct net_device *dev)
	305	{
	306	hdlc_device *hdlc = dev_to_hdlc(dev);
	307
	308	if (hdlc->proto) {
	309	if (hdlc->proto->detach)
	310	hdlc->proto->detach(dev);
	311	module_put(hdlc->proto->module);
	312	hdlc->proto = NULL;
	313	}
	314	kfree(hdlc->state);
	315	hdlc->state = NULL;
b5284e5a	316	hdlc_setup_dev(dev);
eb2a2fd9 KH	317	}
	318
	319
	320	void register_hdlc_protocol(struct hdlc_proto *proto)
	321	{
	322	proto->next = first_proto;
	323	first_proto = proto;
	324	}
	325
	326
	327	void unregister_hdlc_protocol(struct hdlc_proto *proto)
	328	{
	329	struct hdlc_proto **p = &first_proto;
	330	while (*p) {
	331	if (*p == proto) {
	332	*p = proto->next;
	333	return;
	334	}
	335	p = &((*p)->next);
	336	}
	337	}
	338
	339
	340
1da177e4 LT	341	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	342	MODULE_DESCRIPTION("HDLC support module");
	343	MODULE_LICENSE("GPL v2");
	344
	345	EXPORT_SYMBOL(hdlc_open);
	346	EXPORT_SYMBOL(hdlc_close);
1da177e4 LT	347	EXPORT_SYMBOL(hdlc_ioctl);
1da177e4 LT	348	EXPORT_SYMBOL(alloc_hdlcdev);
1da177e4	349	EXPORT_SYMBOL(unregister_hdlc_device);
eb2a2fd9 KH	350	EXPORT_SYMBOL(register_hdlc_protocol);
	351	EXPORT_SYMBOL(unregister_hdlc_protocol);
	352	EXPORT_SYMBOL(attach_hdlc_protocol);
	353	EXPORT_SYMBOL(detach_hdlc_protocol);
1da177e4 LT	354
	355	static struct packet_type hdlc_packet_type = {
	356	.type = __constant_htons(ETH_P_HDLC),
	357	.func = hdlc_rcv,
	358	};
	359
	360
c2ce9204 KH	361	static struct notifier_block hdlc_notifier = {
	362	.notifier_call = hdlc_device_event,
	363	};
	364
	365
1da177e4 LT	366	static int __init hdlc_module_init(void)
1da177e4 LT	367	{
c2ce9204 KH	368	int result;
c2ce9204 KH	369
1da177e4	370	printk(KERN_INFO "%s\n", version);
c2ce9204 KH	371	if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0)
c2ce9204 KH	372	return result;
1da177e4 LT	373	dev_add_pack(&hdlc_packet_type);
	374	return 0;
	375	}
	376
	377
	378
	379	static void __exit hdlc_module_exit(void)
	380	{
	381	dev_remove_pack(&hdlc_packet_type);
c2ce9204	382	unregister_netdevice_notifier(&hdlc_notifier);
1da177e4 LT	383	}
	384
	385
	386	module_init(hdlc_module_init);
	387	module_exit(hdlc_module_exit);