[linux-2.6-block.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;
}__packed;


struct cisco_packet {
	__be32 type;		/* code */
	__be32 par1;
	__be32 par2;
	__be16 rel;		/* reliability */
	__be32 time;
}__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) {
		netdev_warn(dev, "Memory squeeze on cisco_keepalive_send()\n");
		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)) {
			netdev_info(dev, "Invalid length of Cisco control packet (%d bytes)\n",
				    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 :-) */
			rcu_read_lock();
			in_dev = __in_dev_get_rcu(dev);
			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);
			}
			rcu_read_unlock();
			dev_kfree_skb_any(skb);
			return NET_RX_SUCCESS;

		case CISCO_ADDR_REPLY:
			netdev_info(dev, "Unexpected Cisco IP address reply\n");
			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;
					netdev_info(dev, "Link up (peer uptime %ud%uh%um%us)\n",
						    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) */

	netdev_info(dev, "Unsupported protocol %x\n", 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;
		netdev_info(dev, "Link down\n");
		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;
ba2d3587	39	}__packed;
eb2a2fd9 KH	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;
ba2d3587	48	}__packed;
eb2a2fd9 KH	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	105	if (!skb) {
12a3bfef	106	netdev_warn(dev, "Memory squeeze on cisco_keepalive_send()\n");
1da177e4 LT	107	return;
	108	}
	109	skb_reserve(skb, 4);
	110	cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
eb2a2fd9	111	data = (struct cisco_packet*)(skb->data + 4);
1da177e4 LT	112
1da177e4 LT	113	data->type = htonl(type);
abf17ffd KH	114	data->par1 = par1;
abf17ffd KH	115	data->par2 = par2;
09640e63	116	data->rel = cpu_to_be16(0xFFFF);
1da177e4 LT	117	/* we will need do_div here if 1000 % HZ != 0 */
	118	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
	119
eb2a2fd9	120	skb_put(skb, sizeof(struct cisco_packet));
1da177e4 LT	121	skb->priority = TC_PRIO_CONTROL;
1da177e4 LT	122	skb->dev = dev;
c1d2bbe1	123	skb_reset_network_header(skb);
1da177e4 LT	124
	125	dev_queue_xmit(skb);
	126	}
	127
	128
	129
ab611487	130	static __be16 cisco_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	131	{
eb2a2fd9	132	struct hdlc_header data = (struct hdlc_header)skb->data;
1da177e4	133
eb2a2fd9	134	if (skb->len < sizeof(struct hdlc_header))
09640e63	135	return cpu_to_be16(ETH_P_HDLC);
1da177e4 LT	136
	137	if (data->address != CISCO_MULTICAST &&
	138	data->address != CISCO_UNICAST)
09640e63	139	return cpu_to_be16(ETH_P_HDLC);
1da177e4	140
640462cb	141	switch (data->protocol) {
09640e63 HH	142	case cpu_to_be16(ETH_P_IP):
	143	case cpu_to_be16(ETH_P_IPX):
	144	case cpu_to_be16(ETH_P_IPV6):
eb2a2fd9	145	skb_pull(skb, sizeof(struct hdlc_header));
1da177e4 LT	146	return data->protocol;
1da177e4 LT	147	default:
09640e63	148	return cpu_to_be16(ETH_P_HDLC);
1da177e4 LT	149	}
	150	}
	151
	152
	153	static int cisco_rx(struct sk_buff *skb)
	154	{
	155	struct net_device *dev = skb->dev;
	156	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f	157	struct cisco_state *st = state(hdlc);
eb2a2fd9 KH	158	struct hdlc_header data = (struct hdlc_header)skb->data;
eb2a2fd9 KH	159	struct cisco_packet *cisco_data;
1da177e4	160	struct in_device *in_dev;
a144ea4b	161	__be32 addr, mask;
9652041d	162	u32 ack;
1da177e4	163
eb2a2fd9	164	if (skb->len < sizeof(struct hdlc_header))
1da177e4 LT	165	goto rx_error;
	166
	167	if (data->address != CISCO_MULTICAST &&
	168	data->address != CISCO_UNICAST)
	169	goto rx_error;
	170
4dfce407	171	switch (ntohs(data->protocol)) {
1da177e4 LT	172	case CISCO_SYS_INFO:
	173	/* Packet is not needed, drop it. */
	174	dev_kfree_skb_any(skb);
	175	return NET_RX_SUCCESS;
	176
	177	case CISCO_KEEPALIVE:
eb2a2fd9 KH	178	if ((skb->len != sizeof(struct hdlc_header) +
	179	CISCO_PACKET_LEN) &&
	180	(skb->len != sizeof(struct hdlc_header) +
	181	CISCO_BIG_PACKET_LEN)) {
12a3bfef JP	182	netdev_info(dev, "Invalid length of Cisco control packet (%d bytes)\n",
12a3bfef JP	183	skb->len);
1da177e4 LT	184	goto rx_error;
	185	}
	186
eb2a2fd9 KH	187	cisco_data = (struct cisco_packet*)(skb->data + sizeof
eb2a2fd9 KH	188	(struct hdlc_header));
1da177e4	189
640462cb	190	switch (ntohl (cisco_data->type)) {
1da177e4	191	case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
95ae6b22 ED	192	rcu_read_lock();
95ae6b22 ED	193	in_dev = __in_dev_get_rcu(dev);
1da177e4	194	addr = 0;
09640e63	195	mask = ~cpu_to_be32(0); /* is the mask correct? */
1da177e4 LT	196
	197	if (in_dev != NULL) {
	198	struct in_ifaddr **ifap = &in_dev->ifa_list;
	199
	200	while (*ifap != NULL) {
	201	if (strcmp(dev->name,
	202	(*ifap)->ifa_label) == 0) {
	203	addr = (*ifap)->ifa_local;
	204	mask = (*ifap)->ifa_mask;
	205	break;
	206	}
	207	ifap = &(*ifap)->ifa_next;
	208	}
	209
	210	cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
	211	addr, mask);
	212	}
95ae6b22	213	rcu_read_unlock();
1da177e4 LT	214	dev_kfree_skb_any(skb);
	215	return NET_RX_SUCCESS;
	216
	217	case CISCO_ADDR_REPLY:
12a3bfef	218	netdev_info(dev, "Unexpected Cisco IP address reply\n");
1da177e4 LT	219	goto rx_error;
	220
	221	case CISCO_KEEPALIVE_REQ:
aff26e2f KH	222	spin_lock(&st->lock);
aff26e2f KH	223	st->rxseq = ntohl(cisco_data->par1);
9652041d KH	224	ack = ntohl(cisco_data->par2);
	225	if (ack && (ack == st->txseq \|\|
	226	/* our current REQ may be in transit */
	227	ack == st->txseq - 1)) {
aff26e2f KH	228	st->last_poll = jiffies;
aff26e2f KH	229	if (!st->up) {
1da177e4 LT	230	u32 sec, min, hrs, days;
	231	sec = ntohl(cisco_data->time) / 1000;
	232	min = sec / 60; sec -= min * 60;
	233	hrs = min / 60; min -= hrs * 60;
	234	days = hrs / 24; hrs -= days * 24;
12a3bfef JP	235	netdev_info(dev, "Link up (peer uptime %ud%uh%um%us)\n",
12a3bfef JP	236	days, hrs, min, sec);
c2ce9204	237	netif_dormant_off(dev);
aff26e2f	238	st->up = 1;
1da177e4 LT	239	}
1da177e4 LT	240	}
aff26e2f	241	spin_unlock(&st->lock);
1da177e4 LT	242
	243	dev_kfree_skb_any(skb);
	244	return NET_RX_SUCCESS;
640462cb RM	245	} /* switch (keepalive type) */
640462cb RM	246	} /* switch (protocol) */
1da177e4	247
12a3bfef	248	netdev_info(dev, "Unsupported protocol %x\n", ntohs(data->protocol));
1da177e4 LT	249	dev_kfree_skb_any(skb);
	250	return NET_RX_DROP;
	251
198191c4 KH	252	rx_error:
198191c4 KH	253	dev->stats.rx_errors++; /* Mark error */
1da177e4 LT	254	dev_kfree_skb_any(skb);
	255	return NET_RX_DROP;
	256	}
	257
	258
	259
	260	static void cisco_timer(unsigned long arg)
	261	{
	262	struct net_device dev = (struct net_device )arg;
	263	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f	264	struct cisco_state *st = state(hdlc);
1da177e4	265
aff26e2f KH	266	spin_lock(&st->lock);
	267	if (st->up &&
	268	time_after(jiffies, st->last_poll + st->settings.timeout * HZ)) {
	269	st->up = 0;
12a3bfef	270	netdev_info(dev, "Link down\n");
c2ce9204	271	netif_dormant_on(dev);
1da177e4 LT	272	}
1da177e4 LT	273
aff26e2f KH	274	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, htonl(++st->txseq),
aff26e2f KH	275	htonl(st->rxseq));
aff26e2f KH	276	spin_unlock(&st->lock);
	277
	278	st->timer.expires = jiffies + st->settings.interval * HZ;
	279	st->timer.function = cisco_timer;
	280	st->timer.data = arg;
	281	add_timer(&st->timer);
1da177e4 LT	282	}
	283
	284
	285
	286	static void cisco_start(struct net_device *dev)
	287	{
	288	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f KH	289	struct cisco_state *st = state(hdlc);
	290	unsigned long flags;
	291
	292	spin_lock_irqsave(&st->lock, flags);
9652041d	293	st->up = st->txseq = st->rxseq = 0;
aff26e2f KH	294	spin_unlock_irqrestore(&st->lock, flags);
	295
	296	init_timer(&st->timer);
	297	st->timer.expires = jiffies + HZ; /* First poll after 1 s */
	298	st->timer.function = cisco_timer;
	299	st->timer.data = (unsigned long)dev;
	300	add_timer(&st->timer);
1da177e4 LT	301	}
	302
	303
	304
	305	static void cisco_stop(struct net_device *dev)
	306	{
	307	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f KH	308	struct cisco_state *st = state(hdlc);
	309	unsigned long flags;
	310
	311	del_timer_sync(&st->timer);
	312
	313	spin_lock_irqsave(&st->lock, flags);
c2ce9204	314	netif_dormant_on(dev);
9652041d	315	st->up = st->txseq = 0;
aff26e2f	316	spin_unlock_irqrestore(&st->lock, flags);
1da177e4 LT	317	}
	318
	319
eb2a2fd9 KH	320	static struct hdlc_proto proto = {
	321	.start = cisco_start,
	322	.stop = cisco_stop,
	323	.type_trans = cisco_type_trans,
	324	.ioctl = cisco_ioctl,
40d25142	325	.netif_rx = cisco_rx,
eb2a2fd9 KH	326	.module = THIS_MODULE,
eb2a2fd9 KH	327	};
3b04ddde SH	328
	329	static const struct header_ops cisco_header_ops = {
	330	.create = cisco_hard_header,
	331	};
4dfce407	332
eb2a2fd9	333	static int cisco_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	334	{
	335	cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
	336	const size_t size = sizeof(cisco_proto);
	337	cisco_proto new_settings;
	338	hdlc_device *hdlc = dev_to_hdlc(dev);
	339	int result;
	340
	341	switch (ifr->ifr_settings.type) {
	342	case IF_GET_PROTO:
eb2a2fd9 KH	343	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	344	return -EINVAL;
1da177e4 LT	345	ifr->ifr_settings.type = IF_PROTO_CISCO;
	346	if (ifr->ifr_settings.size < size) {
	347	ifr->ifr_settings.size = size; /* data size wanted */
	348	return -ENOBUFS;
	349	}
eb2a2fd9	350	if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
1da177e4 LT	351	return -EFAULT;
	352	return 0;
	353
	354	case IF_PROTO_CISCO:
4dfce407	355	if (!capable(CAP_NET_ADMIN))
1da177e4 LT	356	return -EPERM;
1da177e4 LT	357
4dfce407	358	if (dev->flags & IFF_UP)
1da177e4 LT	359	return -EBUSY;
	360
	361	if (copy_from_user(&new_settings, cisco_s, size))
	362	return -EFAULT;
	363
	364	if (new_settings.interval < 1 \|\|
	365	new_settings.timeout < 2)
	366	return -EINVAL;
	367
4dfce407	368	result = hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1da177e4 LT	369	if (result)
	370	return result;
	371
40d25142	372	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	373	sizeof(struct cisco_state));
	374	if (result)
	375	return result;
1da177e4	376
eb2a2fd9	377	memcpy(&state(hdlc)->settings, &new_settings, size);
aff26e2f	378	spin_lock_init(&state(hdlc)->lock);
3b04ddde	379	dev->header_ops = &cisco_header_ops;
1da177e4	380	dev->type = ARPHRD_CISCO;
c2ce9204	381	netif_dormant_on(dev);
1da177e4 LT	382	return 0;
	383	}
	384
	385	return -EINVAL;
	386	}
eb2a2fd9 KH	387
	388
	389	static int __init mod_init(void)
	390	{
	391	register_hdlc_protocol(&proto);
	392	return 0;
	393	}
	394
	395
	396
	397	static void __exit mod_exit(void)
	398	{
	399	unregister_hdlc_protocol(&proto);
	400	}
	401
	402
	403	module_init(mod_init);
	404	module_exit(mod_exit);
	405
	406	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	407	MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
	408	MODULE_LICENSE("GPL v2");