[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wan / hdlc_cisco.c

/*
 * Generic HDLC support routines for Linux
 * Cisco HDLC support
 *
 * Copyright (C) 2000 - 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.
 */

#include <linux/errno.h>
#include <linux/hdlc.h>
#include <linux/if_arp.h>
#include <linux/inetdevice.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <linux/poll.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>

#undef DEBUG_HARD_HEADER

#define CISCO_MULTICAST		0x8F	/* Cisco multicast address */
#define CISCO_UNICAST		0x0F	/* Cisco unicast address */
#define CISCO_KEEPALIVE		0x8035	/* Cisco keepalive protocol */
#define CISCO_SYS_INFO		0x2000	/* Cisco interface/system info */
#define CISCO_ADDR_REQ		0	/* Cisco address request */
#define CISCO_ADDR_REPLY	1	/* Cisco address reply */
#define CISCO_KEEPALIVE_REQ	2	/* Cisco keepalive request */


struct hdlc_header {
	u8 address;
	u8 control;
	__be16 protocol;
}__attribute__ ((packed));


struct cisco_packet {
	__be32 type;		/* code */
	__be32 par1;
	__be32 par2;
	__be16 rel;		/* reliability */
	__be32 time;
}__attribute__ ((packed));
#define	CISCO_PACKET_LEN	18
#define	CISCO_BIG_PACKET_LEN	20


struct cisco_state {
	cisco_proto settings;

	struct timer_list timer;
	spinlock_t lock;
	unsigned long last_poll;
	int up;
	u32 txseq; /* TX sequence number, 0 = none */
	u32 rxseq; /* RX sequence number */
};


static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr);


static inline struct cisco_state* state(hdlc_device *hdlc)
{
	return (struct cisco_state *)hdlc->state;
}


static int cisco_hard_header(struct sk_buff *skb, struct net_device *dev,
			     u16 type, const void *daddr, const void *saddr,
			     unsigned int len)
{
	struct hdlc_header *data;
#ifdef DEBUG_HARD_HEADER
	printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
#endif

	skb_push(skb, sizeof(struct hdlc_header));
	data = (struct hdlc_header*)skb->data;
	if (type == CISCO_KEEPALIVE)
		data->address = CISCO_MULTICAST;
	else
		data->address = CISCO_UNICAST;
	data->control = 0;
	data->protocol = htons(type);

	return sizeof(struct hdlc_header);
}


static void cisco_keepalive_send(struct net_device *dev, u32 type,
				 __be32 par1, __be32 par2)
{
	struct sk_buff *skb;
	struct cisco_packet *data;

	skb = dev_alloc_skb(sizeof(struct hdlc_header) +
			    sizeof(struct cisco_packet));
	if (!skb) {
		printk(KERN_WARNING
		       "%s: Memory squeeze on cisco_keepalive_send()\n",
		       dev->name);
		return;
	}
	skb_reserve(skb, 4);
	cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
	data = (struct cisco_packet*)(skb->data + 4);

	data->type = htonl(type);
	data->par1 = par1;
	data->par2 = par2;
	data->rel = cpu_to_be16(0xFFFF);
	/* we will need do_div here if 1000 % HZ != 0 */
	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));

	skb_put(skb, sizeof(struct cisco_packet));
	skb->priority = TC_PRIO_CONTROL;
	skb->dev = dev;
	skb_reset_network_header(skb);

	dev_queue_xmit(skb);
}


static __be16 cisco_type_trans(struct sk_buff *skb, struct net_device *dev)
{
	struct hdlc_header *data = (struct hdlc_header*)skb->data;

	if (skb->len < sizeof(struct hdlc_header))
		return cpu_to_be16(ETH_P_HDLC);

	if (data->address != CISCO_MULTICAST &&
	    data->address != CISCO_UNICAST)
		return cpu_to_be16(ETH_P_HDLC);

	switch (data->protocol) {
	case cpu_to_be16(ETH_P_IP):
	case cpu_to_be16(ETH_P_IPX):
	case cpu_to_be16(ETH_P_IPV6):
		skb_pull(skb, sizeof(struct hdlc_header));
		return data->protocol;
	default:
		return cpu_to_be16(ETH_P_HDLC);
	}
}


static int cisco_rx(struct sk_buff *skb)
{
	struct net_device *dev = skb->dev;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct cisco_state *st = state(hdlc);
	struct hdlc_header *data = (struct hdlc_header*)skb->data;
	struct cisco_packet *cisco_data;
	struct in_device *in_dev;
	__be32 addr, mask;
	u32 ack;

	if (skb->len < sizeof(struct hdlc_header))
		goto rx_error;

	if (data->address != CISCO_MULTICAST &&
	    data->address != CISCO_UNICAST)
		goto rx_error;

	switch (ntohs(data->protocol)) {
	case CISCO_SYS_INFO:
		/* Packet is not needed, drop it. */
		dev_kfree_skb_any(skb);
		return NET_RX_SUCCESS;

	case CISCO_KEEPALIVE:
		if ((skb->len != sizeof(struct hdlc_header) +
		     CISCO_PACKET_LEN) &&
		    (skb->len != sizeof(struct hdlc_header) +
		     CISCO_BIG_PACKET_LEN)) {
			printk(KERN_INFO "%s: Invalid length of Cisco control"
			       " packet (%d bytes)\n", dev->name, skb->len);
			goto rx_error;
		}

		cisco_data = (struct cisco_packet*)(skb->data + sizeof
						    (struct hdlc_header));

		switch (ntohl (cisco_data->type)) {
		case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
			in_dev = dev->ip_ptr;
			addr = 0;
			mask = ~cpu_to_be32(0); /* is the mask correct? */

			if (in_dev != NULL) {
				struct in_ifaddr **ifap = &in_dev->ifa_list;

				while (*ifap != NULL) {
					if (strcmp(dev->name,
						   (*ifap)->ifa_label) == 0) {
						addr = (*ifap)->ifa_local;
						mask = (*ifap)->ifa_mask;
						break;
					}
					ifap = &(*ifap)->ifa_next;
				}

				cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
						     addr, mask);
			}
			dev_kfree_skb_any(skb);
			return NET_RX_SUCCESS;

		case CISCO_ADDR_REPLY:
			printk(KERN_INFO "%s: Unexpected Cisco IP address "
			       "reply\n", dev->name);
			goto rx_error;

		case CISCO_KEEPALIVE_REQ:
			spin_lock(&st->lock);
			st->rxseq = ntohl(cisco_data->par1);
			ack = ntohl(cisco_data->par2);
			if (ack && (ack == st->txseq ||
				    /* our current REQ may be in transit */
				    ack == st->txseq - 1)) {
				st->last_poll = jiffies;
				if (!st->up) {
					u32 sec, min, hrs, days;
					sec = ntohl(cisco_data->time) / 1000;
					min = sec / 60; sec -= min * 60;
					hrs = min / 60; min -= hrs * 60;
					days = hrs / 24; hrs -= days * 24;
					printk(KERN_INFO "%s: Link up (peer "
					       "uptime %ud%uh%um%us)\n",
					       dev->name, days, hrs, min, sec);
					netif_dormant_off(dev);
					st->up = 1;
				}
			}
			spin_unlock(&st->lock);

			dev_kfree_skb_any(skb);
			return NET_RX_SUCCESS;
		} /* switch (keepalive type) */
	} /* switch (protocol) */

	printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
	       ntohs(data->protocol));
	dev_kfree_skb_any(skb);
	return NET_RX_DROP;

rx_error:
	dev->stats.rx_errors++; /* Mark error */
	dev_kfree_skb_any(skb);
	return NET_RX_DROP;
}


static void cisco_timer(unsigned long arg)
{
	struct net_device *dev = (struct net_device *)arg;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct cisco_state *st = state(hdlc);

	spin_lock(&st->lock);
	if (st->up &&
	    time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) {
		st->up = 0;
		printk(KERN_INFO "%s: Link down\n", dev->name);
		netif_dormant_on(dev);
	}

	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
			     htonl(st->rxseq));
	spin_unlock(&st->lock);

	st->timer.expires = jiffies + st->settings.interval * HZ;
	st->timer.function = cisco_timer;
	st->timer.data = arg;
	add_timer(&st->timer);
}


static void cisco_start(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct cisco_state *st = state(hdlc);
	unsigned long flags;

	spin_lock_irqsave(&st->lock, flags);
	st->up = st->txseq = st->rxseq = 0;
	spin_unlock_irqrestore(&st->lock, flags);

	init_timer(&st->timer);
	st->timer.expires = jiffies + HZ; /* First poll after 1 s */
	st->timer.function = cisco_timer;
	st->timer.data = (unsigned long)dev;
	add_timer(&st->timer);
}


static void cisco_stop(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	struct cisco_state *st = state(hdlc);
	unsigned long flags;

	del_timer_sync(&st->timer);

	spin_lock_irqsave(&st->lock, flags);
	netif_dormant_on(dev);
	st->up = st->txseq = 0;
	spin_unlock_irqrestore(&st->lock, flags);
}


static struct hdlc_proto proto = {
	.start		= cisco_start,
	.stop		= cisco_stop,
	.type_trans	= cisco_type_trans,
	.ioctl		= cisco_ioctl,
	.netif_rx	= cisco_rx,
	.module		= THIS_MODULE,
};

static const struct header_ops cisco_header_ops = {
	.create = cisco_hard_header,
};

static int cisco_ioctl(struct net_device *dev, struct ifreq *ifr)
{
	cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
	const size_t size = sizeof(cisco_proto);
	cisco_proto new_settings;
	hdlc_device *hdlc = dev_to_hdlc(dev);
	int result;

	switch (ifr->ifr_settings.type) {
	case IF_GET_PROTO:
		if (dev_to_hdlc(dev)->proto != &proto)
			return -EINVAL;
		ifr->ifr_settings.type = IF_PROTO_CISCO;
		if (ifr->ifr_settings.size < size) {
			ifr->ifr_settings.size = size; /* data size wanted */
			return -ENOBUFS;
		}
		if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
			return -EFAULT;
		return 0;

	case IF_PROTO_CISCO:
		if (!capable(CAP_NET_ADMIN))
			return -EPERM;

		if (dev->flags & IFF_UP)
			return -EBUSY;

		if (copy_from_user(&new_settings, cisco_s, size))
			return -EFAULT;

		if (new_settings.interval < 1 ||
		    new_settings.timeout < 2)
			return -EINVAL;

		result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
		if (result)
			return result;

		result = attach_hdlc_protocol(dev, &proto,
					      sizeof(struct cisco_state));
		if (result)
			return result;

		memcpy(&state(hdlc)->settings, &new_settings, size);
		spin_lock_init(&state(hdlc)->lock);
		dev->header_ops = &cisco_header_ops;
		dev->type = ARPHRD_CISCO;
		netif_dormant_on(dev);
		return 0;
	}

	return -EINVAL;
}


static int __init mod_init(void)
{
	register_hdlc_protocol(&proto);
	return 0;
}


static void __exit mod_exit(void)
{
	unregister_hdlc_protocol(&proto);
}


module_init(mod_init);
module_exit(mod_exit);

MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Generic HDLC support routines for Linux
	3	* Cisco HDLC support
	4	*
eb2a2fd9	5	* Copyright (C) 2000 - 2006 Krzysztof Halasa <khc@pm.waw.pl>
1da177e4 LT	6	*
	7	* This program is free software; you can redistribute it and/or modify it
	8	* under the terms of version 2 of the GNU General Public License
	9	* as published by the Free Software Foundation.
	10	*/
	11
1da177e4	12	#include <linux/errno.h>
4dfce407	13	#include <linux/hdlc.h>
1da177e4	14	#include <linux/if_arp.h>
4dfce407	15	#include <linux/inetdevice.h>
1da177e4	16	#include <linux/init.h>
4dfce407 KH	17	#include <linux/kernel.h>
4dfce407 KH	18	#include <linux/module.h>
1da177e4	19	#include <linux/pkt_sched.h>
4dfce407	20	#include <linux/poll.h>
1da177e4	21	#include <linux/rtnetlink.h>
4dfce407	22	#include <linux/skbuff.h>
1da177e4 LT	23
	24	#undef DEBUG_HARD_HEADER
	25
	26	#define CISCO_MULTICAST 0x8F /* Cisco multicast address */
	27	#define CISCO_UNICAST 0x0F /* Cisco unicast address */
	28	#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
	29	#define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
	30	#define CISCO_ADDR_REQ 0 /* Cisco address request */
	31	#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
	32	#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
	33
	34
eb2a2fd9 KH	35	struct hdlc_header {
	36	u8 address;
	37	u8 control;
abf17ffd	38	__be16 protocol;
eb2a2fd9 KH	39	}__attribute__ ((packed));
	40
	41
	42	struct cisco_packet {
abf17ffd KH	43	__be32 type; /* code */
	44	__be32 par1;
	45	__be32 par2;
	46	__be16 rel; /* reliability */
	47	__be32 time;
eb2a2fd9 KH	48	}__attribute__ ((packed));
	49	#define CISCO_PACKET_LEN 18
	50	#define CISCO_BIG_PACKET_LEN 20
	51
	52
	53	struct cisco_state {
	54	cisco_proto settings;
	55
	56	struct timer_list timer;
aff26e2f	57	spinlock_t lock;
eb2a2fd9 KH	58	unsigned long last_poll;
eb2a2fd9 KH	59	int up;
9652041d	60	u32 txseq; /* TX sequence number, 0 = none */
eb2a2fd9 KH	61	u32 rxseq; /* RX sequence number */
	62	};
	63
	64
	65	static int cisco_ioctl(struct net_device dev, struct ifreq ifr);
	66
	67
4dfce407	68	static inline struct cisco_state* state(hdlc_device *hdlc)
eb2a2fd9	69	{
4dfce407	70	return (struct cisco_state *)hdlc->state;
eb2a2fd9 KH	71	}
	72
	73
1da177e4	74	static int cisco_hard_header(struct sk_buff skb, struct net_device dev,
3b04ddde	75	u16 type, const void daddr, const void saddr,
1da177e4 LT	76	unsigned int len)
1da177e4 LT	77	{
eb2a2fd9	78	struct hdlc_header *data;
1da177e4 LT	79	#ifdef DEBUG_HARD_HEADER
	80	printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
	81	#endif
	82
eb2a2fd9 KH	83	skb_push(skb, sizeof(struct hdlc_header));
eb2a2fd9 KH	84	data = (struct hdlc_header*)skb->data;
1da177e4 LT	85	if (type == CISCO_KEEPALIVE)
	86	data->address = CISCO_MULTICAST;
	87	else
	88	data->address = CISCO_UNICAST;
	89	data->control = 0;
	90	data->protocol = htons(type);
	91
eb2a2fd9	92	return sizeof(struct hdlc_header);
1da177e4 LT	93	}
	94
	95
	96
	97	static void cisco_keepalive_send(struct net_device *dev, u32 type,
abf17ffd	98	__be32 par1, __be32 par2)
1da177e4 LT	99	{
1da177e4 LT	100	struct sk_buff *skb;
eb2a2fd9	101	struct cisco_packet *data;
1da177e4	102
eb2a2fd9 KH	103	skb = dev_alloc_skb(sizeof(struct hdlc_header) +
eb2a2fd9 KH	104	sizeof(struct cisco_packet));
1da177e4 LT	105	if (!skb) {
	106	printk(KERN_WARNING
	107	"%s: Memory squeeze on cisco_keepalive_send()\n",
	108	dev->name);
	109	return;
	110	}
	111	skb_reserve(skb, 4);
	112	cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
eb2a2fd9	113	data = (struct cisco_packet*)(skb->data + 4);
1da177e4 LT	114
1da177e4 LT	115	data->type = htonl(type);
abf17ffd KH	116	data->par1 = par1;
abf17ffd KH	117	data->par2 = par2;
09640e63	118	data->rel = cpu_to_be16(0xFFFF);
1da177e4 LT	119	/* we will need do_div here if 1000 % HZ != 0 */
	120	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
	121
eb2a2fd9	122	skb_put(skb, sizeof(struct cisco_packet));
1da177e4 LT	123	skb->priority = TC_PRIO_CONTROL;
1da177e4 LT	124	skb->dev = dev;
c1d2bbe1	125	skb_reset_network_header(skb);
1da177e4 LT	126
	127	dev_queue_xmit(skb);
	128	}
	129
	130
	131
ab611487	132	static __be16 cisco_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	133	{
eb2a2fd9	134	struct hdlc_header data = (struct hdlc_header)skb->data;
1da177e4	135
eb2a2fd9	136	if (skb->len < sizeof(struct hdlc_header))
09640e63	137	return cpu_to_be16(ETH_P_HDLC);
1da177e4 LT	138
	139	if (data->address != CISCO_MULTICAST &&
	140	data->address != CISCO_UNICAST)
09640e63	141	return cpu_to_be16(ETH_P_HDLC);
1da177e4	142
640462cb	143	switch (data->protocol) {
09640e63 HH	144	case cpu_to_be16(ETH_P_IP):
	145	case cpu_to_be16(ETH_P_IPX):
	146	case cpu_to_be16(ETH_P_IPV6):
eb2a2fd9	147	skb_pull(skb, sizeof(struct hdlc_header));
1da177e4 LT	148	return data->protocol;
1da177e4 LT	149	default:
09640e63	150	return cpu_to_be16(ETH_P_HDLC);
1da177e4 LT	151	}
	152	}
	153
	154
	155	static int cisco_rx(struct sk_buff *skb)
	156	{
	157	struct net_device *dev = skb->dev;
	158	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f	159	struct cisco_state *st = state(hdlc);
eb2a2fd9 KH	160	struct hdlc_header data = (struct hdlc_header)skb->data;
eb2a2fd9 KH	161	struct cisco_packet *cisco_data;
1da177e4	162	struct in_device *in_dev;
a144ea4b	163	__be32 addr, mask;
9652041d	164	u32 ack;
1da177e4	165
eb2a2fd9	166	if (skb->len < sizeof(struct hdlc_header))
1da177e4 LT	167	goto rx_error;
	168
	169	if (data->address != CISCO_MULTICAST &&
	170	data->address != CISCO_UNICAST)
	171	goto rx_error;
	172
4dfce407	173	switch (ntohs(data->protocol)) {
1da177e4 LT	174	case CISCO_SYS_INFO:
	175	/* Packet is not needed, drop it. */
	176	dev_kfree_skb_any(skb);
	177	return NET_RX_SUCCESS;
	178
	179	case CISCO_KEEPALIVE:
eb2a2fd9 KH	180	if ((skb->len != sizeof(struct hdlc_header) +
	181	CISCO_PACKET_LEN) &&
	182	(skb->len != sizeof(struct hdlc_header) +
	183	CISCO_BIG_PACKET_LEN)) {
	184	printk(KERN_INFO "%s: Invalid length of Cisco control"
	185	" packet (%d bytes)\n", dev->name, skb->len);
1da177e4 LT	186	goto rx_error;
	187	}
	188
eb2a2fd9 KH	189	cisco_data = (struct cisco_packet*)(skb->data + sizeof
eb2a2fd9 KH	190	(struct hdlc_header));
1da177e4	191
640462cb	192	switch (ntohl (cisco_data->type)) {
1da177e4 LT	193	case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
	194	in_dev = dev->ip_ptr;
	195	addr = 0;
09640e63	196	mask = ~cpu_to_be32(0); /* is the mask correct? */
1da177e4 LT	197
	198	if (in_dev != NULL) {
	199	struct in_ifaddr **ifap = &in_dev->ifa_list;
	200
	201	while (*ifap != NULL) {
	202	if (strcmp(dev->name,
	203	(*ifap)->ifa_label) == 0) {
	204	addr = (*ifap)->ifa_local;
	205	mask = (*ifap)->ifa_mask;
	206	break;
	207	}
	208	ifap = &(*ifap)->ifa_next;
	209	}
	210
	211	cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
	212	addr, mask);
	213	}
	214	dev_kfree_skb_any(skb);
	215	return NET_RX_SUCCESS;
	216
	217	case CISCO_ADDR_REPLY:
	218	printk(KERN_INFO "%s: Unexpected Cisco IP address "
	219	"reply\n", dev->name);
	220	goto rx_error;
	221
	222	case CISCO_KEEPALIVE_REQ:
aff26e2f KH	223	spin_lock(&st->lock);
aff26e2f KH	224	st->rxseq = ntohl(cisco_data->par1);
9652041d KH	225	ack = ntohl(cisco_data->par2);
	226	if (ack && (ack == st->txseq \|\|
	227	/* our current REQ may be in transit */
	228	ack == st->txseq - 1)) {
aff26e2f KH	229	st->last_poll = jiffies;
aff26e2f KH	230	if (!st->up) {
1da177e4 LT	231	u32 sec, min, hrs, days;
	232	sec = ntohl(cisco_data->time) / 1000;
	233	min = sec / 60; sec -= min * 60;
	234	hrs = min / 60; min -= hrs * 60;
	235	days = hrs / 24; hrs -= days * 24;
	236	printk(KERN_INFO "%s: Link up (peer "
	237	"uptime %ud%uh%um%us)\n",
aff26e2f	238	dev->name, days, hrs, min, sec);
c2ce9204	239	netif_dormant_off(dev);
aff26e2f	240	st->up = 1;
1da177e4 LT	241	}
1da177e4 LT	242	}
aff26e2f	243	spin_unlock(&st->lock);
1da177e4 LT	244
	245	dev_kfree_skb_any(skb);
	246	return NET_RX_SUCCESS;
640462cb RM	247	} /* switch (keepalive type) */
640462cb RM	248	} /* switch (protocol) */
1da177e4 LT	249
1da177e4 LT	250	printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
abf17ffd	251	ntohs(data->protocol));
1da177e4 LT	252	dev_kfree_skb_any(skb);
	253	return NET_RX_DROP;
	254
198191c4 KH	255	rx_error:
198191c4 KH	256	dev->stats.rx_errors++; /* Mark error */
1da177e4 LT	257	dev_kfree_skb_any(skb);
	258	return NET_RX_DROP;
	259	}
	260
	261
	262
	263	static void cisco_timer(unsigned long arg)
	264	{
	265	struct net_device dev = (struct net_device )arg;
	266	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f	267	struct cisco_state *st = state(hdlc);
1da177e4	268
aff26e2f KH	269	spin_lock(&st->lock);
	270	if (st->up &&
	271	time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) {
	272	st->up = 0;
1da177e4	273	printk(KERN_INFO "%s: Link down\n", dev->name);
c2ce9204	274	netif_dormant_on(dev);
1da177e4 LT	275	}
1da177e4 LT	276
aff26e2f KH	277	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
aff26e2f KH	278	htonl(st->rxseq));
aff26e2f KH	279	spin_unlock(&st->lock);
	280
	281	st->timer.expires = jiffies + st->settings.interval * HZ;
	282	st->timer.function = cisco_timer;
	283	st->timer.data = arg;
	284	add_timer(&st->timer);
1da177e4 LT	285	}
	286
	287
	288
	289	static void cisco_start(struct net_device *dev)
	290	{
	291	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f KH	292	struct cisco_state *st = state(hdlc);
	293	unsigned long flags;
	294
	295	spin_lock_irqsave(&st->lock, flags);
9652041d	296	st->up = st->txseq = st->rxseq = 0;
aff26e2f KH	297	spin_unlock_irqrestore(&st->lock, flags);
	298
	299	init_timer(&st->timer);
	300	st->timer.expires = jiffies + HZ; /* First poll after 1 s */
	301	st->timer.function = cisco_timer;
	302	st->timer.data = (unsigned long)dev;
	303	add_timer(&st->timer);
1da177e4 LT	304	}
	305
	306
	307
	308	static void cisco_stop(struct net_device *dev)
	309	{
	310	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f KH	311	struct cisco_state *st = state(hdlc);
	312	unsigned long flags;
	313
	314	del_timer_sync(&st->timer);
	315
	316	spin_lock_irqsave(&st->lock, flags);
c2ce9204	317	netif_dormant_on(dev);
9652041d	318	st->up = st->txseq = 0;
aff26e2f	319	spin_unlock_irqrestore(&st->lock, flags);
1da177e4 LT	320	}
	321
	322
eb2a2fd9 KH	323	static struct hdlc_proto proto = {
	324	.start = cisco_start,
	325	.stop = cisco_stop,
	326	.type_trans = cisco_type_trans,
	327	.ioctl = cisco_ioctl,
40d25142	328	.netif_rx = cisco_rx,
eb2a2fd9 KH	329	.module = THIS_MODULE,
eb2a2fd9 KH	330	};
3b04ddde SH	331
	332	static const struct header_ops cisco_header_ops = {
	333	.create = cisco_hard_header,
	334	};
4dfce407	335
eb2a2fd9	336	static int cisco_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	337	{
	338	cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
	339	const size_t size = sizeof(cisco_proto);
	340	cisco_proto new_settings;
	341	hdlc_device *hdlc = dev_to_hdlc(dev);
	342	int result;
	343
	344	switch (ifr->ifr_settings.type) {
	345	case IF_GET_PROTO:
eb2a2fd9 KH	346	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	347	return -EINVAL;
1da177e4 LT	348	ifr->ifr_settings.type = IF_PROTO_CISCO;
	349	if (ifr->ifr_settings.size < size) {
	350	ifr->ifr_settings.size = size; /* data size wanted */
	351	return -ENOBUFS;
	352	}
eb2a2fd9	353	if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
1da177e4 LT	354	return -EFAULT;
	355	return 0;
	356
	357	case IF_PROTO_CISCO:
4dfce407	358	if (!capable(CAP_NET_ADMIN))
1da177e4 LT	359	return -EPERM;
1da177e4 LT	360
4dfce407	361	if (dev->flags & IFF_UP)
1da177e4 LT	362	return -EBUSY;
	363
	364	if (copy_from_user(&new_settings, cisco_s, size))
	365	return -EFAULT;
	366
	367	if (new_settings.interval < 1 \|\|
	368	new_settings.timeout < 2)
	369	return -EINVAL;
	370
4dfce407	371	result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1da177e4 LT	372	if (result)
	373	return result;
	374
40d25142	375	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	376	sizeof(struct cisco_state));
	377	if (result)
	378	return result;
1da177e4	379
eb2a2fd9	380	memcpy(&state(hdlc)->settings, &new_settings, size);
aff26e2f	381	spin_lock_init(&state(hdlc)->lock);
3b04ddde	382	dev->header_ops = &cisco_header_ops;
1da177e4	383	dev->type = ARPHRD_CISCO;
c2ce9204	384	netif_dormant_on(dev);
1da177e4 LT	385	return 0;
	386	}
	387
	388	return -EINVAL;
	389	}
eb2a2fd9 KH	390
	391
	392	static int __init mod_init(void)
	393	{
	394	register_hdlc_protocol(&proto);
	395	return 0;
	396	}
	397
	398
	399
	400	static void __exit mod_exit(void)
	401	{
	402	unregister_hdlc_protocol(&proto);
	403	}
	404
	405
	406	module_init(mod_init);
	407	module_exit(mod_exit);
	408
	409	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	410	MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
	411	MODULE_LICENSE("GPL v2");