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