[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->nd_net != &init_net)
		return NOTIFY_DONE;

	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;
c2ce9204 KH	111
e9dc8653 EB	112	if (dev->nd_net != &init_net)
	113	return NOTIFY_DONE;
	114
c2ce9204 KH	115	if (dev->get_stats != hdlc_get_stats)
	116	return NOTIFY_DONE; /* not an HDLC device */
	117
	118	if (event != NETDEV_CHANGE)
	119	return NOTIFY_DONE; /* Only interrested in carrier changes */
	120
	121	on = netif_carrier_ok(dev);
1da177e4 LT	122
1da177e4 LT	123	#ifdef DEBUG_LINK
c2ce9204 KH	124	printk(KERN_DEBUG "%s: hdlc_device_event NETDEV_CHANGE, carrier %i\n",
c2ce9204 KH	125	dev->name, on);
1da177e4 LT	126	#endif
1da177e4 LT	127
c2ce9204	128	hdlc = dev_to_hdlc(dev);
1da177e4 LT	129	spin_lock_irqsave(&hdlc->state_lock, flags);
	130
	131	if (hdlc->carrier == on)
	132	goto carrier_exit; /* no change in DCD line level */
	133
1da177e4 LT	134	hdlc->carrier = on;
	135
	136	if (!hdlc->open)
	137	goto carrier_exit;
	138
b3dd65f9 KH	139	if (hdlc->carrier) {
b3dd65f9 KH	140	printk(KERN_INFO "%s: Carrier detected\n", dev->name);
c2ce9204	141	hdlc_proto_start(dev);
b3dd65f9 KH	142	} else {
b3dd65f9 KH	143	printk(KERN_INFO "%s: Carrier lost\n", dev->name);
c2ce9204	144	hdlc_proto_stop(dev);
b3dd65f9	145	}
1da177e4 LT	146
	147	carrier_exit:
	148	spin_unlock_irqrestore(&hdlc->state_lock, flags);
c2ce9204	149	return NOTIFY_DONE;
1da177e4 LT	150	}
	151
	152
	153
	154	/* Must be called by hardware driver when HDLC device is being opened */
	155	int hdlc_open(struct net_device *dev)
	156	{
	157	hdlc_device *hdlc = dev_to_hdlc(dev);
	158	#ifdef DEBUG_LINK
eb2a2fd9	159	printk(KERN_DEBUG "%s: hdlc_open() carrier %i open %i\n", dev->name,
1da177e4 LT	160	hdlc->carrier, hdlc->open);
	161	#endif
	162
eb2a2fd9	163	if (hdlc->proto == NULL)
1da177e4 LT	164	return -ENOSYS; /* no protocol attached */
1da177e4 LT	165
eb2a2fd9 KH	166	if (hdlc->proto->open) {
eb2a2fd9 KH	167	int result = hdlc->proto->open(dev);
1da177e4 LT	168	if (result)
	169	return result;
	170	}
	171
	172	spin_lock_irq(&hdlc->state_lock);
	173
b3dd65f9 KH	174	if (hdlc->carrier) {
b3dd65f9 KH	175	printk(KERN_INFO "%s: Carrier detected\n", dev->name);
c2ce9204	176	hdlc_proto_start(dev);
b3dd65f9 KH	177	} else
b3dd65f9 KH	178	printk(KERN_INFO "%s: No carrier\n", dev->name);
1da177e4 LT	179
	180	hdlc->open = 1;
	181
	182	spin_unlock_irq(&hdlc->state_lock);
	183	return 0;
	184	}
	185
	186
	187
	188	/* Must be called by hardware driver when HDLC device is being closed */
	189	void hdlc_close(struct net_device *dev)
	190	{
	191	hdlc_device *hdlc = dev_to_hdlc(dev);
	192	#ifdef DEBUG_LINK
eb2a2fd9	193	printk(KERN_DEBUG "%s: hdlc_close() carrier %i open %i\n", dev->name,
1da177e4 LT	194	hdlc->carrier, hdlc->open);
	195	#endif
	196
	197	spin_lock_irq(&hdlc->state_lock);
	198
	199	hdlc->open = 0;
	200	if (hdlc->carrier)
c2ce9204	201	hdlc_proto_stop(dev);
1da177e4 LT	202
	203	spin_unlock_irq(&hdlc->state_lock);
	204
eb2a2fd9 KH	205	if (hdlc->proto->close)
eb2a2fd9 KH	206	hdlc->proto->close(dev);
1da177e4 LT	207	}
	208
	209
	210
1da177e4 LT	211	int hdlc_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
1da177e4 LT	212	{
eb2a2fd9 KH	213	struct hdlc_proto *proto = first_proto;
eb2a2fd9 KH	214	int result;
1da177e4 LT	215
	216	if (cmd != SIOCWANDEV)
	217	return -EINVAL;
	218
eb2a2fd9 KH	219	if (dev_to_hdlc(dev)->proto) {
	220	result = dev_to_hdlc(dev)->proto->ioctl(dev, ifr);
	221	if (result != -EINVAL)
	222	return result;
1da177e4 LT	223	}
1da177e4 LT	224
eb2a2fd9 KH	225	/* Not handled by currently attached protocol (if any) */
	226
	227	while (proto) {
	228	if ((result = proto->ioctl(dev, ifr)) != -EINVAL)
	229	return result;
	230	proto = proto->next;
1da177e4	231	}
eb2a2fd9	232	return -EINVAL;
1da177e4 LT	233	}
1da177e4 LT	234
b5284e5a KH	235	static void hdlc_setup_dev(struct net_device *dev)
	236	{
	237	/* Re-init all variables changed by HDLC protocol drivers,
	238	* including ether_setup() called from hdlc_raw_eth.c.
	239	*/
	240	dev->get_stats = hdlc_get_stats;
	241	dev->flags = IFF_POINTOPOINT \| IFF_NOARP;
	242	dev->mtu = HDLC_MAX_MTU;
	243	dev->type = ARPHRD_RAWHDLC;
	244	dev->hard_header_len = 16;
	245	dev->addr_len = 0;
	246	dev->hard_header = NULL;
	247	dev->rebuild_header = NULL;
	248	dev->set_mac_address = NULL;
	249	dev->hard_header_cache = NULL;
	250	dev->header_cache_update = NULL;
	251	dev->change_mtu = hdlc_change_mtu;
	252	dev->hard_header_parse = NULL;
	253	}
	254
0bf94faf	255	static void hdlc_setup(struct net_device *dev)
1da177e4 LT	256	{
	257	hdlc_device *hdlc = dev_to_hdlc(dev);
	258
b5284e5a	259	hdlc_setup_dev(dev);
1da177e4 LT	260	hdlc->carrier = 1;
	261	hdlc->open = 0;
	262	spin_lock_init(&hdlc->state_lock);
	263	}
	264
	265	struct net_device alloc_hdlcdev(void priv)
	266	{
	267	struct net_device *dev;
eb2a2fd9 KH	268	dev = alloc_netdev(sizeof(struct hdlc_device_desc) +
eb2a2fd9 KH	269	sizeof(hdlc_device), "hdlc%d", hdlc_setup);
1da177e4 LT	270	if (dev)
	271	dev_to_hdlc(dev)->priv = priv;
	272	return dev;
	273	}
	274
1da177e4 LT	275	void unregister_hdlc_device(struct net_device *dev)
	276	{
	277	rtnl_lock();
1da177e4	278	unregister_netdevice(dev);
eb2a2fd9	279	detach_hdlc_protocol(dev);
1da177e4 LT	280	rtnl_unlock();
	281	}
	282
	283
	284
eb2a2fd9 KH	285	int attach_hdlc_protocol(struct net_device dev, struct hdlc_proto proto,
	286	int (rx)(struct sk_buff skb), size_t size)
	287	{
	288	detach_hdlc_protocol(dev);
	289
	290	if (!try_module_get(proto->module))
	291	return -ENOSYS;
	292
	293	if (size)
	294	if ((dev_to_hdlc(dev)->state = kmalloc(size,
	295	GFP_KERNEL)) == NULL) {
	296	printk(KERN_WARNING "Memory squeeze on"
	297	" hdlc_proto_attach()\n");
	298	module_put(proto->module);
	299	return -ENOBUFS;
	300	}
	301	dev_to_hdlc(dev)->proto = proto;
	302	dev_to_desc(dev)->netif_rx = rx;
	303	return 0;
	304	}
	305
	306
	307	void detach_hdlc_protocol(struct net_device *dev)
	308	{
	309	hdlc_device *hdlc = dev_to_hdlc(dev);
	310
	311	if (hdlc->proto) {
	312	if (hdlc->proto->detach)
	313	hdlc->proto->detach(dev);
	314	module_put(hdlc->proto->module);
	315	hdlc->proto = NULL;
	316	}
	317	kfree(hdlc->state);
	318	hdlc->state = NULL;
b5284e5a	319	hdlc_setup_dev(dev);
eb2a2fd9 KH	320	}
	321
	322
	323	void register_hdlc_protocol(struct hdlc_proto *proto)
	324	{
	325	proto->next = first_proto;
	326	first_proto = proto;
	327	}
	328
	329
	330	void unregister_hdlc_protocol(struct hdlc_proto *proto)
	331	{
	332	struct hdlc_proto **p = &first_proto;
	333	while (*p) {
	334	if (*p == proto) {
	335	*p = proto->next;
	336	return;
	337	}
	338	p = &((*p)->next);
	339	}
	340	}
	341
	342
	343
1da177e4 LT	344	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	345	MODULE_DESCRIPTION("HDLC support module");
	346	MODULE_LICENSE("GPL v2");
	347
	348	EXPORT_SYMBOL(hdlc_open);
	349	EXPORT_SYMBOL(hdlc_close);
1da177e4 LT	350	EXPORT_SYMBOL(hdlc_ioctl);
1da177e4 LT	351	EXPORT_SYMBOL(alloc_hdlcdev);
1da177e4	352	EXPORT_SYMBOL(unregister_hdlc_device);
eb2a2fd9 KH	353	EXPORT_SYMBOL(register_hdlc_protocol);
	354	EXPORT_SYMBOL(unregister_hdlc_protocol);
	355	EXPORT_SYMBOL(attach_hdlc_protocol);
	356	EXPORT_SYMBOL(detach_hdlc_protocol);
1da177e4 LT	357
	358	static struct packet_type hdlc_packet_type = {
	359	.type = __constant_htons(ETH_P_HDLC),
	360	.func = hdlc_rcv,
	361	};
	362
	363
c2ce9204 KH	364	static struct notifier_block hdlc_notifier = {
	365	.notifier_call = hdlc_device_event,
	366	};
	367
	368
1da177e4 LT	369	static int __init hdlc_module_init(void)
1da177e4 LT	370	{
c2ce9204 KH	371	int result;
c2ce9204 KH	372
1da177e4	373	printk(KERN_INFO "%s\n", version);
c2ce9204 KH	374	if ((result = register_netdevice_notifier(&hdlc_notifier)) != 0)
c2ce9204 KH	375	return result;
1da177e4 LT	376	dev_add_pack(&hdlc_packet_type);
	377	return 0;
	378	}
	379
	380
	381
	382	static void __exit hdlc_module_exit(void)
	383	{
	384	dev_remove_pack(&hdlc_packet_type);
c2ce9204	385	unregister_netdevice_notifier(&hdlc_notifier);
1da177e4 LT	386	}
	387
	388
	389	module_init(hdlc_module_init);
	390	module_exit(hdlc_module_exit);