[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/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/hdlc.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;
	int request_sent;
	u32 txseq; /* TX sequence number */
	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 = __constant_htons(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 __constant_htons(ETH_P_HDLC);

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

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

	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 = __constant_htonl(~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);
			if (st->request_sent &&
			    ntohl(cisco_data->par2) == st->txseq) {
				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_to_hdlc(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));
	st->request_sent = 1;
	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 = 0;
	st->request_sent = 0;
	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 = 0;
	st->request_sent = 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->hard_start_xmit = hdlc->xmit;
		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
	12	#include <linux/module.h>
	13	#include <linux/kernel.h>
	14	#include <linux/slab.h>
	15	#include <linux/poll.h>
	16	#include <linux/errno.h>
	17	#include <linux/if_arp.h>
	18	#include <linux/init.h>
	19	#include <linux/skbuff.h>
	20	#include <linux/pkt_sched.h>
	21	#include <linux/inetdevice.h>
	22	#include <linux/lapb.h>
	23	#include <linux/rtnetlink.h>
	24	#include <linux/hdlc.h>
	25
	26	#undef DEBUG_HARD_HEADER
	27
	28	#define CISCO_MULTICAST 0x8F /* Cisco multicast address */
	29	#define CISCO_UNICAST 0x0F /* Cisco unicast address */
	30	#define CISCO_KEEPALIVE 0x8035 /* Cisco keepalive protocol */
	31	#define CISCO_SYS_INFO 0x2000 /* Cisco interface/system info */
	32	#define CISCO_ADDR_REQ 0 /* Cisco address request */
	33	#define CISCO_ADDR_REPLY 1 /* Cisco address reply */
	34	#define CISCO_KEEPALIVE_REQ 2 /* Cisco keepalive request */
	35
	36
eb2a2fd9 KH	37	struct hdlc_header {
	38	u8 address;
	39	u8 control;
abf17ffd	40	__be16 protocol;
eb2a2fd9 KH	41	}__attribute__ ((packed));
	42
	43
	44	struct cisco_packet {
abf17ffd KH	45	__be32 type; /* code */
	46	__be32 par1;
	47	__be32 par2;
	48	__be16 rel; /* reliability */
	49	__be32 time;
eb2a2fd9 KH	50	}__attribute__ ((packed));
	51	#define CISCO_PACKET_LEN 18
	52	#define CISCO_BIG_PACKET_LEN 20
	53
	54
	55	struct cisco_state {
	56	cisco_proto settings;
	57
	58	struct timer_list timer;
aff26e2f	59	spinlock_t lock;
eb2a2fd9 KH	60	unsigned long last_poll;
	61	int up;
	62	int request_sent;
	63	u32 txseq; /* TX sequence number */
	64	u32 rxseq; /* RX sequence number */
	65	};
	66
	67
	68	static int cisco_ioctl(struct net_device dev, struct ifreq ifr);
	69
	70
	71	static inline struct cisco_state * state(hdlc_device *hdlc)
	72	{
	73	return(struct cisco_state *)(hdlc->state);
	74	}
	75
	76
1da177e4	77	static int cisco_hard_header(struct sk_buff skb, struct net_device dev,
3b04ddde	78	u16 type, const void daddr, const void saddr,
1da177e4 LT	79	unsigned int len)
1da177e4 LT	80	{
eb2a2fd9	81	struct hdlc_header *data;
1da177e4 LT	82	#ifdef DEBUG_HARD_HEADER
	83	printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
	84	#endif
	85
eb2a2fd9 KH	86	skb_push(skb, sizeof(struct hdlc_header));
eb2a2fd9 KH	87	data = (struct hdlc_header*)skb->data;
1da177e4 LT	88	if (type == CISCO_KEEPALIVE)
	89	data->address = CISCO_MULTICAST;
	90	else
	91	data->address = CISCO_UNICAST;
	92	data->control = 0;
	93	data->protocol = htons(type);
	94
eb2a2fd9	95	return sizeof(struct hdlc_header);
1da177e4 LT	96	}
	97
	98
	99
	100	static void cisco_keepalive_send(struct net_device *dev, u32 type,
abf17ffd	101	__be32 par1, __be32 par2)
1da177e4 LT	102	{
1da177e4 LT	103	struct sk_buff *skb;
eb2a2fd9	104	struct cisco_packet *data;
1da177e4	105
eb2a2fd9 KH	106	skb = dev_alloc_skb(sizeof(struct hdlc_header) +
eb2a2fd9 KH	107	sizeof(struct cisco_packet));
1da177e4 LT	108	if (!skb) {
	109	printk(KERN_WARNING
	110	"%s: Memory squeeze on cisco_keepalive_send()\n",
	111	dev->name);
	112	return;
	113	}
	114	skb_reserve(skb, 4);
	115	cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
eb2a2fd9	116	data = (struct cisco_packet*)(skb->data + 4);
1da177e4 LT	117
1da177e4 LT	118	data->type = htonl(type);
abf17ffd KH	119	data->par1 = par1;
	120	data->par2 = par2;
	121	data->rel = __constant_htons(0xFFFF);
1da177e4 LT	122	/* we will need do_div here if 1000 % HZ != 0 */
	123	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
	124
eb2a2fd9	125	skb_put(skb, sizeof(struct cisco_packet));
1da177e4 LT	126	skb->priority = TC_PRIO_CONTROL;
1da177e4 LT	127	skb->dev = dev;
c1d2bbe1	128	skb_reset_network_header(skb);
1da177e4 LT	129
	130	dev_queue_xmit(skb);
	131	}
	132
	133
	134
ab611487	135	static __be16 cisco_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	136	{
eb2a2fd9	137	struct hdlc_header data = (struct hdlc_header)skb->data;
1da177e4	138
eb2a2fd9	139	if (skb->len < sizeof(struct hdlc_header))
1da177e4 LT	140	return __constant_htons(ETH_P_HDLC);
	141
	142	if (data->address != CISCO_MULTICAST &&
	143	data->address != CISCO_UNICAST)
	144	return __constant_htons(ETH_P_HDLC);
	145
	146	switch(data->protocol) {
	147	case __constant_htons(ETH_P_IP):
	148	case __constant_htons(ETH_P_IPX):
	149	case __constant_htons(ETH_P_IPV6):
eb2a2fd9	150	skb_pull(skb, sizeof(struct hdlc_header));
1da177e4 LT	151	return data->protocol;
	152	default:
	153	return __constant_htons(ETH_P_HDLC);
	154	}
	155	}
	156
	157
	158	static int cisco_rx(struct sk_buff *skb)
	159	{
	160	struct net_device *dev = skb->dev;
	161	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f	162	struct cisco_state *st = state(hdlc);
eb2a2fd9 KH	163	struct hdlc_header data = (struct hdlc_header)skb->data;
eb2a2fd9 KH	164	struct cisco_packet *cisco_data;
1da177e4	165	struct in_device *in_dev;
a144ea4b	166	__be32 addr, mask;
1da177e4	167
eb2a2fd9	168	if (skb->len < sizeof(struct hdlc_header))
1da177e4 LT	169	goto rx_error;
	170
	171	if (data->address != CISCO_MULTICAST &&
	172	data->address != CISCO_UNICAST)
	173	goto rx_error;
	174
	175	switch(ntohs(data->protocol)) {
	176	case CISCO_SYS_INFO:
	177	/* Packet is not needed, drop it. */
	178	dev_kfree_skb_any(skb);
	179	return NET_RX_SUCCESS;
	180
	181	case CISCO_KEEPALIVE:
eb2a2fd9 KH	182	if ((skb->len != sizeof(struct hdlc_header) +
	183	CISCO_PACKET_LEN) &&
	184	(skb->len != sizeof(struct hdlc_header) +
	185	CISCO_BIG_PACKET_LEN)) {
	186	printk(KERN_INFO "%s: Invalid length of Cisco control"
	187	" packet (%d bytes)\n", dev->name, skb->len);
1da177e4 LT	188	goto rx_error;
	189	}
	190
eb2a2fd9 KH	191	cisco_data = (struct cisco_packet*)(skb->data + sizeof
eb2a2fd9 KH	192	(struct hdlc_header));
1da177e4 LT	193
	194	switch(ntohl (cisco_data->type)) {
	195	case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
	196	in_dev = dev->ip_ptr;
	197	addr = 0;
abf17ffd	198	mask = __constant_htonl(~0); /* is the mask correct? */
1da177e4 LT	199
	200	if (in_dev != NULL) {
	201	struct in_ifaddr **ifap = &in_dev->ifa_list;
	202
	203	while (*ifap != NULL) {
	204	if (strcmp(dev->name,
	205	(*ifap)->ifa_label) == 0) {
	206	addr = (*ifap)->ifa_local;
	207	mask = (*ifap)->ifa_mask;
	208	break;
	209	}
	210	ifap = &(*ifap)->ifa_next;
	211	}
	212
	213	cisco_keepalive_send(dev, CISCO_ADDR_REPLY,
	214	addr, mask);
	215	}
	216	dev_kfree_skb_any(skb);
	217	return NET_RX_SUCCESS;
	218
	219	case CISCO_ADDR_REPLY:
	220	printk(KERN_INFO "%s: Unexpected Cisco IP address "
	221	"reply\n", dev->name);
	222	goto rx_error;
	223
	224	case CISCO_KEEPALIVE_REQ:
aff26e2f KH	225	spin_lock(&st->lock);
	226	st->rxseq = ntohl(cisco_data->par1);
	227	if (st->request_sent &&
	228	ntohl(cisco_data->par2) == st->txseq) {
	229	st->last_poll = jiffies;
	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;
	247	} /* switch(keepalive type) */
	248	} /* switch(protocol) */
	249
	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
	255	rx_error:
40d25142	256	dev_to_hdlc(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),
	278	htonl(st->rxseq));
	279	st->request_sent = 1;
	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);
	297	st->up = 0;
	298	st->request_sent = 0;
	299	st->txseq = st->rxseq = 0;
	300	spin_unlock_irqrestore(&st->lock, flags);
	301
	302	init_timer(&st->timer);
	303	st->timer.expires = jiffies + HZ; /* First poll after 1 s */
	304	st->timer.function = cisco_timer;
	305	st->timer.data = (unsigned long)dev;
	306	add_timer(&st->timer);
1da177e4 LT	307	}
	308
	309
	310
	311	static void cisco_stop(struct net_device *dev)
	312	{
	313	hdlc_device *hdlc = dev_to_hdlc(dev);
aff26e2f KH	314	struct cisco_state *st = state(hdlc);
	315	unsigned long flags;
	316
	317	del_timer_sync(&st->timer);
	318
	319	spin_lock_irqsave(&st->lock, flags);
c2ce9204	320	netif_dormant_on(dev);
aff26e2f KH	321	st->up = 0;
	322	st->request_sent = 0;
	323	spin_unlock_irqrestore(&st->lock, flags);
1da177e4 LT	324	}
	325
	326
eb2a2fd9 KH	327	static struct hdlc_proto proto = {
	328	.start = cisco_start,
	329	.stop = cisco_stop,
	330	.type_trans = cisco_type_trans,
	331	.ioctl = cisco_ioctl,
40d25142	332	.netif_rx = cisco_rx,
eb2a2fd9 KH	333	.module = THIS_MODULE,
eb2a2fd9 KH	334	};
3b04ddde SH	335
	336	static const struct header_ops cisco_header_ops = {
	337	.create = cisco_hard_header,
	338	};
eb2a2fd9 KH	339
eb2a2fd9 KH	340	static int cisco_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	341	{
	342	cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
	343	const size_t size = sizeof(cisco_proto);
	344	cisco_proto new_settings;
	345	hdlc_device *hdlc = dev_to_hdlc(dev);
	346	int result;
	347
	348	switch (ifr->ifr_settings.type) {
	349	case IF_GET_PROTO:
eb2a2fd9 KH	350	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	351	return -EINVAL;
1da177e4 LT	352	ifr->ifr_settings.type = IF_PROTO_CISCO;
	353	if (ifr->ifr_settings.size < size) {
	354	ifr->ifr_settings.size = size; /* data size wanted */
	355	return -ENOBUFS;
	356	}
eb2a2fd9	357	if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
1da177e4 LT	358	return -EFAULT;
	359	return 0;
	360
	361	case IF_PROTO_CISCO:
	362	if(!capable(CAP_NET_ADMIN))
	363	return -EPERM;
	364
	365	if(dev->flags & IFF_UP)
	366	return -EBUSY;
	367
	368	if (copy_from_user(&new_settings, cisco_s, size))
	369	return -EFAULT;
	370
	371	if (new_settings.interval < 1 \|\|
	372	new_settings.timeout < 2)
	373	return -EINVAL;
	374
	375	result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1da177e4 LT	376	if (result)
	377	return result;
	378
40d25142	379	result = attach_hdlc_protocol(dev, &proto,
eb2a2fd9 KH	380	sizeof(struct cisco_state));
	381	if (result)
	382	return result;
1da177e4	383
eb2a2fd9	384	memcpy(&state(hdlc)->settings, &new_settings, size);
aff26e2f	385	spin_lock_init(&state(hdlc)->lock);
1da177e4	386	dev->hard_start_xmit = hdlc->xmit;
3b04ddde	387	dev->header_ops = &cisco_header_ops;
1da177e4	388	dev->type = ARPHRD_CISCO;
c2ce9204	389	netif_dormant_on(dev);
1da177e4 LT	390	return 0;
	391	}
	392
	393	return -EINVAL;
	394	}
eb2a2fd9 KH	395
	396
	397	static int __init mod_init(void)
	398	{
	399	register_hdlc_protocol(&proto);
	400	return 0;
	401	}
	402
	403
	404
	405	static void __exit mod_exit(void)
	406	{
	407	unregister_hdlc_protocol(&proto);
	408	}
	409
	410
	411	module_init(mod_init);
	412	module_exit(mod_exit);
	413
	414	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	415	MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
	416	MODULE_LICENSE("GPL v2");