[mirror_ubuntu-zesty-kernel.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;
	u16 protocol;
}__attribute__ ((packed));


struct cisco_packet {
	u32 type;		/* code */
	u32 par1;
	u32 par2;
	u16 rel;		/* reliability */
	u32 time;
}__attribute__ ((packed));
#define	CISCO_PACKET_LEN	18
#define	CISCO_BIG_PACKET_LEN	20


struct cisco_state {
	cisco_proto settings;

	struct timer_list timer;
	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, void *daddr, 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,
				 u32 par1, u32 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 = htonl(par1);
	data->par2 = htonl(par2);
	data->rel = 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 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 = ~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:
			state(hdlc)->rxseq = ntohl(cisco_data->par1);
			if (state(hdlc)->request_sent &&
			    ntohl(cisco_data->par2) == state(hdlc)->txseq) {
				state(hdlc)->last_poll = jiffies;
				if (!state(hdlc)->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);
					state(hdlc)->up = 1;
				}
			}

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

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

 rx_error:
	dev_to_desc(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);

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

	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, ++state(hdlc)->txseq,
			     state(hdlc)->rxseq);
	state(hdlc)->request_sent = 1;
	state(hdlc)->timer.expires = jiffies +
		state(hdlc)->settings.interval * HZ;
	state(hdlc)->timer.function = cisco_timer;
	state(hdlc)->timer.data = arg;
	add_timer(&state(hdlc)->timer);
}


static void cisco_start(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	state(hdlc)->up = 0;
	state(hdlc)->request_sent = 0;
	state(hdlc)->txseq = state(hdlc)->rxseq = 0;

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


static void cisco_stop(struct net_device *dev)
{
	hdlc_device *hdlc = dev_to_hdlc(dev);
	del_timer_sync(&state(hdlc)->timer);
	netif_dormant_on(dev);
	state(hdlc)->up = 0;
	state(hdlc)->request_sent = 0;
}


static struct hdlc_proto proto = {
	.start		= cisco_start,
	.stop		= cisco_stop,
	.type_trans	= cisco_type_trans,
	.ioctl		= cisco_ioctl,
	.module		= THIS_MODULE,
};
 
 
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, cisco_rx,
					      sizeof(struct cisco_state));
		if (result)
			return result;

		memcpy(&state(hdlc)->settings, &new_settings, size);
		dev->hard_start_xmit = hdlc->xmit;
		dev->hard_header = cisco_hard_header;
		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;
	40	u16 protocol;
	41	}__attribute__ ((packed));
	42
	43
	44	struct cisco_packet {
	45	u32 type; /* code */
	46	u32 par1;
	47	u32 par2;
	48	u16 rel; /* reliability */
	49	u32 time;
	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;
	59	unsigned long last_poll;
	60	int up;
	61	int request_sent;
	62	u32 txseq; /* TX sequence number */
	63	u32 rxseq; /* RX sequence number */
	64	};
	65
	66
	67	static int cisco_ioctl(struct net_device dev, struct ifreq ifr);
	68
	69
	70	static inline struct cisco_state * state(hdlc_device *hdlc)
	71	{
	72	return(struct cisco_state *)(hdlc->state);
	73	}
	74
	75
1da177e4 LT	76	static int cisco_hard_header(struct sk_buff skb, struct net_device dev,
	77	u16 type, void daddr, void saddr,
	78	unsigned int len)
	79	{
eb2a2fd9	80	struct hdlc_header *data;
1da177e4 LT	81	#ifdef DEBUG_HARD_HEADER
	82	printk(KERN_DEBUG "%s: cisco_hard_header called\n", dev->name);
	83	#endif
	84
eb2a2fd9 KH	85	skb_push(skb, sizeof(struct hdlc_header));
eb2a2fd9 KH	86	data = (struct hdlc_header*)skb->data;
1da177e4 LT	87	if (type == CISCO_KEEPALIVE)
	88	data->address = CISCO_MULTICAST;
	89	else
	90	data->address = CISCO_UNICAST;
	91	data->control = 0;
	92	data->protocol = htons(type);
	93
eb2a2fd9	94	return sizeof(struct hdlc_header);
1da177e4 LT	95	}
	96
	97
	98
	99	static void cisco_keepalive_send(struct net_device *dev, u32 type,
	100	u32 par1, u32 par2)
	101	{
	102	struct sk_buff *skb;
eb2a2fd9	103	struct cisco_packet *data;
1da177e4	104
eb2a2fd9 KH	105	skb = dev_alloc_skb(sizeof(struct hdlc_header) +
eb2a2fd9 KH	106	sizeof(struct cisco_packet));
1da177e4 LT	107	if (!skb) {
	108	printk(KERN_WARNING
	109	"%s: Memory squeeze on cisco_keepalive_send()\n",
	110	dev->name);
	111	return;
	112	}
	113	skb_reserve(skb, 4);
	114	cisco_hard_header(skb, dev, CISCO_KEEPALIVE, NULL, NULL, 0);
eb2a2fd9	115	data = (struct cisco_packet*)(skb->data + 4);
1da177e4 LT	116
	117	data->type = htonl(type);
	118	data->par1 = htonl(par1);
	119	data->par2 = htonl(par2);
	120	data->rel = 0xFFFF;
	121	/* we will need do_div here if 1000 % HZ != 0 */
	122	data->time = htonl((jiffies - INITIAL_JIFFIES) * (1000 / HZ));
	123
eb2a2fd9	124	skb_put(skb, sizeof(struct cisco_packet));
1da177e4 LT	125	skb->priority = TC_PRIO_CONTROL;
1da177e4 LT	126	skb->dev = dev;
c1d2bbe1	127	skb_reset_network_header(skb);
1da177e4 LT	128
	129	dev_queue_xmit(skb);
	130	}
	131
	132
	133
ab611487	134	static __be16 cisco_type_trans(struct sk_buff skb, struct net_device dev)
1da177e4	135	{
eb2a2fd9	136	struct hdlc_header data = (struct hdlc_header)skb->data;
1da177e4	137
eb2a2fd9	138	if (skb->len < sizeof(struct hdlc_header))
1da177e4 LT	139	return __constant_htons(ETH_P_HDLC);
	140
	141	if (data->address != CISCO_MULTICAST &&
	142	data->address != CISCO_UNICAST)
	143	return __constant_htons(ETH_P_HDLC);
	144
	145	switch(data->protocol) {
	146	case __constant_htons(ETH_P_IP):
	147	case __constant_htons(ETH_P_IPX):
	148	case __constant_htons(ETH_P_IPV6):
eb2a2fd9	149	skb_pull(skb, sizeof(struct hdlc_header));
1da177e4 LT	150	return data->protocol;
	151	default:
	152	return __constant_htons(ETH_P_HDLC);
	153	}
	154	}
	155
	156
	157	static int cisco_rx(struct sk_buff *skb)
	158	{
	159	struct net_device *dev = skb->dev;
	160	hdlc_device *hdlc = dev_to_hdlc(dev);
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;
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
	173	switch(ntohs(data->protocol)) {
	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 LT	191
	192	switch(ntohl (cisco_data->type)) {
	193	case CISCO_ADDR_REQ: /* Stolen from syncppp.c :-) */
	194	in_dev = dev->ip_ptr;
	195	addr = 0;
	196	mask = ~0; /* is the mask correct? */
	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:
eb2a2fd9 KH	223	state(hdlc)->rxseq = ntohl(cisco_data->par1);
	224	if (state(hdlc)->request_sent &&
	225	ntohl(cisco_data->par2) == state(hdlc)->txseq) {
	226	state(hdlc)->last_poll = jiffies;
	227	if (!state(hdlc)->up) {
1da177e4 LT	228	u32 sec, min, hrs, days;
	229	sec = ntohl(cisco_data->time) / 1000;
	230	min = sec / 60; sec -= min * 60;
	231	hrs = min / 60; min -= hrs * 60;
	232	days = hrs / 24; hrs -= days * 24;
	233	printk(KERN_INFO "%s: Link up (peer "
	234	"uptime %ud%uh%um%us)\n",
	235	dev->name, days, hrs,
	236	min, sec);
c2ce9204	237	netif_dormant_off(dev);
eb2a2fd9	238	state(hdlc)->up = 1;
1da177e4 LT	239	}
	240	}
	241
	242	dev_kfree_skb_any(skb);
	243	return NET_RX_SUCCESS;
	244	} /* switch(keepalive type) */
	245	} /* switch(protocol) */
	246
	247	printk(KERN_INFO "%s: Unsupported protocol %x\n", dev->name,
	248	data->protocol);
	249	dev_kfree_skb_any(skb);
	250	return NET_RX_DROP;
	251
	252	rx_error:
eb2a2fd9	253	dev_to_desc(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);
	264
eb2a2fd9 KH	265	if (state(hdlc)->up &&
	266	time_after(jiffies, state(hdlc)->last_poll +
	267	state(hdlc)->settings.timeout * HZ)) {
	268	state(hdlc)->up = 0;
1da177e4	269	printk(KERN_INFO "%s: Link down\n", dev->name);
c2ce9204	270	netif_dormant_on(dev);
1da177e4 LT	271	}
1da177e4 LT	272
eb2a2fd9 KH	273	cisco_keepalive_send(dev, CISCO_KEEPALIVE_REQ, ++state(hdlc)->txseq,
	274	state(hdlc)->rxseq);
	275	state(hdlc)->request_sent = 1;
	276	state(hdlc)->timer.expires = jiffies +
	277	state(hdlc)->settings.interval * HZ;
	278	state(hdlc)->timer.function = cisco_timer;
	279	state(hdlc)->timer.data = arg;
	280	add_timer(&state(hdlc)->timer);
1da177e4 LT	281	}
	282
	283
	284
	285	static void cisco_start(struct net_device *dev)
	286	{
	287	hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9 KH	288	state(hdlc)->up = 0;
	289	state(hdlc)->request_sent = 0;
	290	state(hdlc)->txseq = state(hdlc)->rxseq = 0;
	291
	292	init_timer(&state(hdlc)->timer);
	293	state(hdlc)->timer.expires = jiffies + HZ; /First poll after 1s/
	294	state(hdlc)->timer.function = cisco_timer;
	295	state(hdlc)->timer.data = (unsigned long)dev;
	296	add_timer(&state(hdlc)->timer);
1da177e4 LT	297	}
	298
	299
	300
	301	static void cisco_stop(struct net_device *dev)
	302	{
	303	hdlc_device *hdlc = dev_to_hdlc(dev);
eb2a2fd9	304	del_timer_sync(&state(hdlc)->timer);
c2ce9204	305	netif_dormant_on(dev);
eb2a2fd9 KH	306	state(hdlc)->up = 0;
eb2a2fd9 KH	307	state(hdlc)->request_sent = 0;
1da177e4 LT	308	}
	309
	310
	311
eb2a2fd9 KH	312	static struct hdlc_proto proto = {
	313	.start = cisco_start,
	314	.stop = cisco_stop,
	315	.type_trans = cisco_type_trans,
	316	.ioctl = cisco_ioctl,
	317	.module = THIS_MODULE,
	318	};
	319
	320
	321	static int cisco_ioctl(struct net_device dev, struct ifreq ifr)
1da177e4 LT	322	{
	323	cisco_proto __user *cisco_s = ifr->ifr_settings.ifs_ifsu.cisco;
	324	const size_t size = sizeof(cisco_proto);
	325	cisco_proto new_settings;
	326	hdlc_device *hdlc = dev_to_hdlc(dev);
	327	int result;
	328
	329	switch (ifr->ifr_settings.type) {
	330	case IF_GET_PROTO:
eb2a2fd9 KH	331	if (dev_to_hdlc(dev)->proto != &proto)
eb2a2fd9 KH	332	return -EINVAL;
1da177e4 LT	333	ifr->ifr_settings.type = IF_PROTO_CISCO;
	334	if (ifr->ifr_settings.size < size) {
	335	ifr->ifr_settings.size = size; /* data size wanted */
	336	return -ENOBUFS;
	337	}
eb2a2fd9	338	if (copy_to_user(cisco_s, &state(hdlc)->settings, size))
1da177e4 LT	339	return -EFAULT;
	340	return 0;
	341
	342	case IF_PROTO_CISCO:
	343	if(!capable(CAP_NET_ADMIN))
	344	return -EPERM;
	345
	346	if(dev->flags & IFF_UP)
	347	return -EBUSY;
	348
	349	if (copy_from_user(&new_settings, cisco_s, size))
	350	return -EFAULT;
	351
	352	if (new_settings.interval < 1 \|\|
	353	new_settings.timeout < 2)
	354	return -EINVAL;
	355
	356	result=hdlc->attach(dev, ENCODING_NRZ,PARITY_CRC16_PR1_CCITT);
1da177e4 LT	357	if (result)
	358	return result;
	359
eb2a2fd9 KH	360	result = attach_hdlc_protocol(dev, &proto, cisco_rx,
	361	sizeof(struct cisco_state));
	362	if (result)
	363	return result;
1da177e4	364
eb2a2fd9	365	memcpy(&state(hdlc)->settings, &new_settings, size);
1da177e4 LT	366	dev->hard_start_xmit = hdlc->xmit;
1da177e4 LT	367	dev->hard_header = cisco_hard_header;
1da177e4	368	dev->type = ARPHRD_CISCO;
c2ce9204	369	netif_dormant_on(dev);
1da177e4 LT	370	return 0;
	371	}
	372
	373	return -EINVAL;
	374	}
eb2a2fd9 KH	375
	376
	377	static int __init mod_init(void)
	378	{
	379	register_hdlc_protocol(&proto);
	380	return 0;
	381	}
	382
	383
	384
	385	static void __exit mod_exit(void)
	386	{
	387	unregister_hdlc_protocol(&proto);
	388	}
	389
	390
	391	module_init(mod_init);
	392	module_exit(mod_exit);
	393
	394	MODULE_AUTHOR("Krzysztof Halasa <khc@pm.waw.pl>");
	395	MODULE_DESCRIPTION("Cisco HDLC protocol support for generic HDLC");
	396	MODULE_LICENSE("GPL v2");