[net-next-2.6.git] / drivers / net / wan / dlci.c

/*
 * DLCI		Implementation of Frame Relay protocol for Linux, according to
 *		RFC 1490.  This generic device provides en/decapsulation for an
 *		underlying hardware driver.  Routes & IPs are assigned to these
 *		interfaces.  Requires 'dlcicfg' program to create usable 
 *		interfaces, the initial one, 'dlci' is for IOCTL use only.
 *
 * Version:	@(#)dlci.c	0.35	4 Jan 1997
 *
 * Author:	Mike McLagan <mike.mclagan@linux.org>
 *
 * Changes:
 *
 *		0.15	Mike Mclagan	Packet freeing, bug in kmalloc call
 *					DLCI_RET handling
 *		0.20	Mike McLagan	More conservative on which packets
 *					are returned for retry and which are
 *					are dropped.  If DLCI_RET_DROP is
 *					returned from the FRAD, the packet is
 *				 	sent back to Linux for re-transmission
 *		0.25	Mike McLagan	Converted to use SIOC IOCTL calls
 *		0.30	Jim Freeman	Fixed to allow IPX traffic
 *		0.35	Michael Elizabeth	Fixed incorrect memcpy_fromfs
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/interrupt.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/in.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/if_frad.h>
#include <linux/bitops.h>

#include <net/sock.h>

#include <asm/system.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/uaccess.h>

static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";

static LIST_HEAD(dlci_devs);

static void dlci_setup(struct net_device *);

/* 
 * these encapsulate the RFC 1490 requirements as well as 
 * deal with packet transmission and reception, working with
 * the upper network layers 
 */

static int dlci_header(struct sk_buff *skb, struct net_device *dev, 
                           unsigned short type, void *daddr, void *saddr, 
                           unsigned len)
{
	struct frhdr		hdr;
	struct dlci_local	*dlp;
	unsigned int		hlen;
	char			*dest;

	dlp = dev->priv;

	hdr.control = FRAD_I_UI;
	switch(type)
	{
		case ETH_P_IP:
			hdr.IP_NLPID = FRAD_P_IP;
			hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
			break;

		/* feel free to add other types, if necessary */

		default:
			hdr.pad = FRAD_P_PADDING;
			hdr.NLPID = FRAD_P_SNAP;
			memset(hdr.OUI, 0, sizeof(hdr.OUI));
			hdr.PID = htons(type);
			hlen = sizeof(hdr);
			break;
	}

	dest = skb_push(skb, hlen);
	if (!dest)
		return(0);

	memcpy(dest, &hdr, hlen);

	return(hlen);
}

static void dlci_receive(struct sk_buff *skb, struct net_device *dev)
{
	struct dlci_local *dlp;
	struct frhdr		*hdr;
	int					process, header;

	dlp = dev->priv;
	if (!pskb_may_pull(skb, sizeof(*hdr))) {
		printk(KERN_NOTICE "%s: invalid data no header\n",
		       dev->name);
		dlp->stats.rx_errors++;
		kfree_skb(skb);
		return;
	}

	hdr = (struct frhdr *) skb->data;
	process = 0;
	header = 0;
	skb->dev = dev;

	if (hdr->control != FRAD_I_UI)
	{
		printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control);
		dlp->stats.rx_errors++;
	}
	else
		switch(hdr->IP_NLPID)
		{
			case FRAD_P_PADDING:
				if (hdr->NLPID != FRAD_P_SNAP)
				{
					printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID);
					dlp->stats.rx_errors++;
					break;
				}
	 
				if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
				{
					printk(KERN_NOTICE "%s: Unsupported organizationally unique identifier 0x%02X-%02X-%02X.\n", dev->name, hdr->OUI[0], hdr->OUI[1], hdr->OUI[2]);
					dlp->stats.rx_errors++;
					break;
				}

				/* at this point, it's an EtherType frame */
				header = sizeof(struct frhdr);
				/* Already in network order ! */
				skb->protocol = hdr->PID;
				process = 1;
				break;

			case FRAD_P_IP:
				header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
				skb->protocol = htons(ETH_P_IP);
				process = 1;
				break;

			case FRAD_P_SNAP:
			case FRAD_P_Q933:
			case FRAD_P_CLNP:
				printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->pad);
				dlp->stats.rx_errors++;
				break;

			default:
				printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
				dlp->stats.rx_errors++;
				break;				
		}

	if (process)
	{
		/* we've set up the protocol, so discard the header */
		skb_reset_mac_header(skb);
		skb_pull(skb, header);
		dlp->stats.rx_bytes += skb->len;
		netif_rx(skb);
		dlp->stats.rx_packets++;
		dev->last_rx = jiffies;
	}
	else
		dev_kfree_skb(skb);
}

static int dlci_transmit(struct sk_buff *skb, struct net_device *dev)
{
	struct dlci_local *dlp;
	int					ret;

	ret = 0;

	if (!skb || !dev)
		return(0);

	dlp = dev->priv;

	netif_stop_queue(dev);
	
	ret = dlp->slave->hard_start_xmit(skb, dlp->slave);
	switch (ret)
	{
		case DLCI_RET_OK:
			dlp->stats.tx_packets++;
			ret = 0;
			break;
			case DLCI_RET_ERR:
			dlp->stats.tx_errors++;
			ret = 0;
			break;
			case DLCI_RET_DROP:
			dlp->stats.tx_dropped++;
			ret = 1;
			break;
	}
	/* Alan Cox recommends always returning 0, and always freeing the packet */
	/* experience suggest a slightly more conservative approach */

	if (!ret)
	{
		dev_kfree_skb(skb);
		netif_wake_queue(dev);
	}
	return(ret);
}

static int dlci_config(struct net_device *dev, struct dlci_conf __user *conf, int get)
{
	struct dlci_conf	config;
	struct dlci_local	*dlp;
	struct frad_local	*flp;
	int			err;

	dlp = dev->priv;

	flp = dlp->slave->priv;

	if (!get)
	{
		if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
			return -EFAULT;
		if (config.flags & ~DLCI_VALID_FLAGS)
			return(-EINVAL);
		memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
		dlp->configured = 1;
	}

	err = (*flp->dlci_conf)(dlp->slave, dev, get);
	if (err)
		return(err);

	if (get)
	{
		if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
			return -EFAULT;
	}

	return(0);
}

static int dlci_dev_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	struct dlci_local *dlp;

	if (!capable(CAP_NET_ADMIN))
		return(-EPERM);

	dlp = dev->priv;

	switch(cmd)
	{
		case DLCI_GET_SLAVE:
			if (!*(short *)(dev->dev_addr))
				return(-EINVAL);

			strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
			break;

		case DLCI_GET_CONF:
		case DLCI_SET_CONF:
			if (!*(short *)(dev->dev_addr))
				return(-EINVAL);

			return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
			break;

		default: 
			return(-EOPNOTSUPP);
	}
	return(0);
}

static int dlci_change_mtu(struct net_device *dev, int new_mtu)
{
	struct dlci_local *dlp;

	dlp = dev->priv;

	return((*dlp->slave->change_mtu)(dlp->slave, new_mtu));
}

static int dlci_open(struct net_device *dev)
{
	struct dlci_local	*dlp;
	struct frad_local	*flp;
	int			err;

	dlp = dev->priv;

	if (!*(short *)(dev->dev_addr))
		return(-EINVAL);

	if (!netif_running(dlp->slave))
		return(-ENOTCONN);

	flp = dlp->slave->priv;
	err = (*flp->activate)(dlp->slave, dev);
	if (err)
		return(err);

	netif_start_queue(dev);

	return 0;
}

static int dlci_close(struct net_device *dev)
{
	struct dlci_local	*dlp;
	struct frad_local	*flp;
	int			err;

	netif_stop_queue(dev);

	dlp = dev->priv;

	flp = dlp->slave->priv;
	err = (*flp->deactivate)(dlp->slave, dev);

	return 0;
}

static struct net_device_stats *dlci_get_stats(struct net_device *dev)
{
	struct dlci_local *dlp;

	dlp = dev->priv;

	return(&dlp->stats);
}

static int dlci_add(struct dlci_add *dlci)
{
	struct net_device	*master, *slave;
	struct dlci_local	*dlp;
	struct frad_local	*flp;
	int			err = -EINVAL;


	/* validate slave device */
	slave = dev_get_by_name(&init_net, dlci->devname);
	if (!slave)
		return -ENODEV;

	if (slave->type != ARPHRD_FRAD || slave->priv == NULL)
		goto err1;

	/* create device name */
	master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
			      dlci_setup);
	if (!master) {
		err = -ENOMEM;
		goto err1;
	}

	/* make sure same slave not already registered */
	rtnl_lock();
	list_for_each_entry(dlp, &dlci_devs, list) {
		if (dlp->slave == slave) {
			err = -EBUSY;
			goto err2;
		}
	}

	err = dev_alloc_name(master, master->name);
	if (err < 0)
		goto err2;

	*(short *)(master->dev_addr) = dlci->dlci;

	dlp = (struct dlci_local *) master->priv;
	dlp->slave = slave;
	dlp->master = master;

	flp = slave->priv;
	err = (*flp->assoc)(slave, master);
	if (err < 0)
		goto err2;

	err = register_netdevice(master);
	if (err < 0) 
		goto err2;

	strcpy(dlci->devname, master->name);

	list_add(&dlp->list, &dlci_devs);
	rtnl_unlock();

	return(0);

 err2:
	rtnl_unlock();
	free_netdev(master);
 err1:
	dev_put(slave);
	return(err);
}

static int dlci_del(struct dlci_add *dlci)
{
	struct dlci_local	*dlp;
	struct frad_local	*flp;
	struct net_device	*master, *slave;
	int			err;

	/* validate slave device */
	master = __dev_get_by_name(&init_net, dlci->devname);
	if (!master)
		return(-ENODEV);

	if (netif_running(master)) {
		return(-EBUSY);
	}

	dlp = master->priv;
	slave = dlp->slave;
	flp = slave->priv;

	rtnl_lock();
	err = (*flp->deassoc)(slave, master);
	if (!err) {
		list_del(&dlp->list);

		unregister_netdevice(master);

		dev_put(slave);
	}
	rtnl_unlock();

	return(err);
}

static int dlci_ioctl(unsigned int cmd, void __user *arg)
{
	struct dlci_add add;
	int err;
	
	if (!capable(CAP_NET_ADMIN))
		return(-EPERM);

	if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
		return -EFAULT;

	switch (cmd)
	{
		case SIOCADDDLCI:
			err = dlci_add(&add);

			if (!err)
				if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
					return -EFAULT;
			break;

		case SIOCDELDLCI:
			err = dlci_del(&add);
			break;

		default:
			err = -EINVAL;
	}

	return(err);
}

static void dlci_setup(struct net_device *dev)
{
	struct dlci_local *dlp = dev->priv;

	dev->flags		= 0;
	dev->open		= dlci_open;
	dev->stop		= dlci_close;
	dev->do_ioctl		= dlci_dev_ioctl;
	dev->hard_start_xmit	= dlci_transmit;
	dev->hard_header	= dlci_header;
	dev->get_stats		= dlci_get_stats;
	dev->change_mtu		= dlci_change_mtu;
	dev->destructor		= free_netdev;

	dlp->receive		= dlci_receive;

	dev->type		= ARPHRD_DLCI;
	dev->hard_header_len	= sizeof(struct frhdr);
	dev->addr_len		= sizeof(short);

}

/* if slave is unregistering, then cleanup master */
static int dlci_dev_event(struct notifier_block *unused,
			  unsigned long event, void *ptr)
{
	struct net_device *dev = (struct net_device *) ptr;

	if (dev->nd_net != &init_net)
		return NOTIFY_DONE;

	if (event == NETDEV_UNREGISTER) {
		struct dlci_local *dlp;

		list_for_each_entry(dlp, &dlci_devs, list) {
			if (dlp->slave == dev) {
				list_del(&dlp->list);
				unregister_netdevice(dlp->master);
				dev_put(dlp->slave);
				break;
			}
		}
	}
	return NOTIFY_DONE;
}

static struct notifier_block dlci_notifier = {
	.notifier_call = dlci_dev_event,
};

static int __init init_dlci(void)
{
	dlci_ioctl_set(dlci_ioctl);
	register_netdevice_notifier(&dlci_notifier);

	printk("%s.\n", version);

	return 0;
}

static void __exit dlci_exit(void)
{
	struct dlci_local	*dlp, *nxt;
	
	dlci_ioctl_set(NULL);
	unregister_netdevice_notifier(&dlci_notifier);

	rtnl_lock();
	list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
		unregister_netdevice(dlp->master);
		dev_put(dlp->slave);
	}
	rtnl_unlock();
}

module_init(init_dlci);
module_exit(dlci_exit);

MODULE_AUTHOR("Mike McLagan");
MODULE_DESCRIPTION("Frame Relay DLCI layer");
MODULE_LICENSE("GPL");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* DLCI Implementation of Frame Relay protocol for Linux, according to
	3	* RFC 1490. This generic device provides en/decapsulation for an
	4	* underlying hardware driver. Routes & IPs are assigned to these
	5	* interfaces. Requires 'dlcicfg' program to create usable
	6	* interfaces, the initial one, 'dlci' is for IOCTL use only.
	7	*
	8	* Version: @(#)dlci.c 0.35 4 Jan 1997
	9	*
	10	* Author: Mike McLagan <mike.mclagan@linux.org>
	11	*
	12	* Changes:
	13	*
	14	* 0.15 Mike Mclagan Packet freeing, bug in kmalloc call
	15	* DLCI_RET handling
	16	* 0.20 Mike McLagan More conservative on which packets
	17	* are returned for retry and which are
	18	* are dropped. If DLCI_RET_DROP is
	19	* returned from the FRAD, the packet is
	20	* sent back to Linux for re-transmission
	21	* 0.25 Mike McLagan Converted to use SIOC IOCTL calls
	22	* 0.30 Jim Freeman Fixed to allow IPX traffic
	23	* 0.35 Michael Elizabeth Fixed incorrect memcpy_fromfs
	24	*
	25	* This program is free software; you can redistribute it and/or
	26	* modify it under the terms of the GNU General Public License
	27	* as published by the Free Software Foundation; either version
	28	* 2 of the License, or (at your option) any later version.
	29	*/
	30
1da177e4 LT	31	#include <linux/module.h>
	32	#include <linux/kernel.h>
	33	#include <linux/types.h>
	34	#include <linux/fcntl.h>
	35	#include <linux/interrupt.h>
	36	#include <linux/ptrace.h>
	37	#include <linux/ioport.h>
	38	#include <linux/in.h>
	39	#include <linux/init.h>
	40	#include <linux/slab.h>
	41	#include <linux/string.h>
	42	#include <linux/errno.h>
	43	#include <linux/netdevice.h>
	44	#include <linux/skbuff.h>
	45	#include <linux/if_arp.h>
	46	#include <linux/if_frad.h>
	47	#include <linux/bitops.h>
	48
	49	#include <net/sock.h>
	50
	51	#include <asm/system.h>
	52	#include <asm/io.h>
	53	#include <asm/dma.h>
	54	#include <asm/uaccess.h>
	55
	56	static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
	57
	58	static LIST_HEAD(dlci_devs);
	59
	60	static void dlci_setup(struct net_device *);
	61
	62	/*
	63	* these encapsulate the RFC 1490 requirements as well as
	64	* deal with packet transmission and reception, working with
	65	* the upper network layers
	66	*/
	67
	68	static int dlci_header(struct sk_buff skb, struct net_device dev,
	69	unsigned short type, void daddr, void saddr,
	70	unsigned len)
	71	{
	72	struct frhdr hdr;
	73	struct dlci_local *dlp;
	74	unsigned int hlen;
	75	char *dest;
	76
	77	dlp = dev->priv;
	78
	79	hdr.control = FRAD_I_UI;
	80	switch(type)
	81	{
	82	case ETH_P_IP:
	83	hdr.IP_NLPID = FRAD_P_IP;
	84	hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
	85	break;
	86
	87	/* feel free to add other types, if necessary */
	88
	89	default:
	90	hdr.pad = FRAD_P_PADDING;
	91	hdr.NLPID = FRAD_P_SNAP;
	92	memset(hdr.OUI, 0, sizeof(hdr.OUI));
	93	hdr.PID = htons(type);
	94	hlen = sizeof(hdr);
95	break;
96	}
97
98	dest = skb_push(skb, hlen);
99	if (!dest)
100	return(0);
101
102	memcpy(dest, &hdr, hlen);
103
104	return(hlen);
105	}
106
107	static void dlci_receive(struct sk_buff skb, struct net_device dev)
108	{
109	struct dlci_local *dlp;
110	struct frhdr *hdr;
111	int process, header;
112
113	dlp = dev->priv;
114	if (!pskb_may_pull(skb, sizeof(*hdr))) {
115	printk(KERN_NOTICE "%s: invalid data no header\n",
116	dev->name);
117	dlp->stats.rx_errors++;
118	kfree_skb(skb);
119	return;
120	}
121
122	hdr = (struct frhdr *) skb->data;
123	process = 0;
124	header = 0;
125	skb->dev = dev;
126
127	if (hdr->control != FRAD_I_UI)
128	{
129	printk(KERN_NOTICE "%s: Invalid header flag 0x%02X.\n", dev->name, hdr->control);
130	dlp->stats.rx_errors++;
131	}
132	else
133	switch(hdr->IP_NLPID)
134	{
135	case FRAD_P_PADDING:
136	if (hdr->NLPID != FRAD_P_SNAP)
137	{
138	printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->NLPID);
139	dlp->stats.rx_errors++;
140	break;
141	}
142
143	if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
144	{
145	printk(KERN_NOTICE "%s: Unsupported organizationally unique identifier 0x%02X-%02X-%02X.\n", dev->name, hdr->OUI[0], hdr->OUI[1], hdr->OUI[2]);
146	dlp->stats.rx_errors++;
147	break;
148	}
149
150	/* at this point, it's an EtherType frame */
151	header = sizeof(struct frhdr);
152	/* Already in network order ! */
153	skb->protocol = hdr->PID;
154	process = 1;
155	break;
156
157	case FRAD_P_IP:
158	header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
159	skb->protocol = htons(ETH_P_IP);
160	process = 1;
161	break;
162
163	case FRAD_P_SNAP:
164	case FRAD_P_Q933:
165	case FRAD_P_CLNP:
166	printk(KERN_NOTICE "%s: Unsupported NLPID 0x%02X.\n", dev->name, hdr->pad);
167	dlp->stats.rx_errors++;
168	break;
169
170	default:
171	printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
172	dlp->stats.rx_errors++;
173	break;
174	}
175
176	if (process)
177	{
178	/* we've set up the protocol, so discard the header */
459a98ed	179	skb_reset_mac_header(skb);
1da177e4 LT	180	skb_pull(skb, header);
	181	dlp->stats.rx_bytes += skb->len;
	182	netif_rx(skb);
	183	dlp->stats.rx_packets++;
	184	dev->last_rx = jiffies;
	185	}
	186	else
	187	dev_kfree_skb(skb);
	188	}
	189
	190	static int dlci_transmit(struct sk_buff skb, struct net_device dev)
	191	{
	192	struct dlci_local *dlp;
	193	int ret;
	194
	195	ret = 0;
	196
	197	if (!skb \|\| !dev)
	198	return(0);
	199
	200	dlp = dev->priv;
	201
	202	netif_stop_queue(dev);
	203
	204	ret = dlp->slave->hard_start_xmit(skb, dlp->slave);
	205	switch (ret)
	206	{
	207	case DLCI_RET_OK:
	208	dlp->stats.tx_packets++;
	209	ret = 0;
	210	break;
	211	case DLCI_RET_ERR:
	212	dlp->stats.tx_errors++;
	213	ret = 0;
	214	break;
	215	case DLCI_RET_DROP:
	216	dlp->stats.tx_dropped++;
	217	ret = 1;
	218	break;
	219	}
	220	/* Alan Cox recommends always returning 0, and always freeing the packet */
	221	/* experience suggest a slightly more conservative approach */
	222
	223	if (!ret)
	224	{
	225	dev_kfree_skb(skb);
	226	netif_wake_queue(dev);
	227	}
	228	return(ret);
	229	}
	230
	231	static int dlci_config(struct net_device dev, struct dlci_conf __user conf, int get)
	232	{
	233	struct dlci_conf config;
	234	struct dlci_local *dlp;
	235	struct frad_local *flp;
	236	int err;
	237
	238	dlp = dev->priv;
	239
	240	flp = dlp->slave->priv;
	241
	242	if (!get)
	243	{
244	if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
245	return -EFAULT;
246	if (config.flags & ~DLCI_VALID_FLAGS)
247	return(-EINVAL);
248	memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
249	dlp->configured = 1;
250	}
251
252	err = (*flp->dlci_conf)(dlp->slave, dev, get);
253	if (err)
254	return(err);
255
256	if (get)
257	{
258	if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
259	return -EFAULT;
260	}
261
262	return(0);
263	}
264
265	static int dlci_dev_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
266	{
267	struct dlci_local *dlp;
268
269	if (!capable(CAP_NET_ADMIN))
270	return(-EPERM);
271
272	dlp = dev->priv;
273
274	switch(cmd)
275	{
276	case DLCI_GET_SLAVE:
277	if (!(short )(dev->dev_addr))
278	return(-EINVAL);
279
280	strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
281	break;
282
283	case DLCI_GET_CONF:
284	case DLCI_SET_CONF:
285	if (!(short )(dev->dev_addr))
286	return(-EINVAL);
287
288	return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
289	break;
290
291	default:
292	return(-EOPNOTSUPP);
293	}
294	return(0);
295	}
296
297	static int dlci_change_mtu(struct net_device *dev, int new_mtu)
298	{
299	struct dlci_local *dlp;
300
301	dlp = dev->priv;
302
303	return((*dlp->slave->change_mtu)(dlp->slave, new_mtu));
304	}
305
306	static int dlci_open(struct net_device *dev)
307	{
308	struct dlci_local *dlp;
309	struct frad_local *flp;
310	int err;
311
312	dlp = dev->priv;
313
314	if (!(short )(dev->dev_addr))
315	return(-EINVAL);
316
317	if (!netif_running(dlp->slave))
318	return(-ENOTCONN);
319
320	flp = dlp->slave->priv;
321	err = (*flp->activate)(dlp->slave, dev);
322	if (err)
323	return(err);
324
325	netif_start_queue(dev);
326
327	return 0;
328	}
329
330	static int dlci_close(struct net_device *dev)
331	{
332	struct dlci_local *dlp;
333	struct frad_local *flp;
334	int err;
335
336	netif_stop_queue(dev);
337
338	dlp = dev->priv;
339
340	flp = dlp->slave->priv;
341	err = (*flp->deactivate)(dlp->slave, dev);
342
343	return 0;
344	}
345
346	static struct net_device_stats dlci_get_stats(struct net_device dev)
347	{
348	struct dlci_local *dlp;
349
350	dlp = dev->priv;
351
352	return(&dlp->stats);
353	}
354
355	static int dlci_add(struct dlci_add *dlci)
356	{
357	struct net_device master, slave;
358	struct dlci_local *dlp;
359	struct frad_local *flp;
360	int err = -EINVAL;
361
362
363	/* validate slave device */
881d966b	364	slave = dev_get_by_name(&init_net, dlci->devname);
1da177e4 LT	365	if (!slave)
	366	return -ENODEV;
	367
	368	if (slave->type != ARPHRD_FRAD \|\| slave->priv == NULL)
	369	goto err1;
	370
	371	/* create device name */
	372	master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
	373	dlci_setup);
	374	if (!master) {
	375	err = -ENOMEM;
	376	goto err1;
	377	}
	378
	379	/* make sure same slave not already registered */
	380	rtnl_lock();
	381	list_for_each_entry(dlp, &dlci_devs, list) {
	382	if (dlp->slave == slave) {
	383	err = -EBUSY;
	384	goto err2;
	385	}
	386	}
	387
	388	err = dev_alloc_name(master, master->name);
	389	if (err < 0)
	390	goto err2;
	391
	392	(short )(master->dev_addr) = dlci->dlci;
	393
	394	dlp = (struct dlci_local *) master->priv;
	395	dlp->slave = slave;
	396	dlp->master = master;
	397
	398	flp = slave->priv;
	399	err = (*flp->assoc)(slave, master);
	400	if (err < 0)
	401	goto err2;
	402
	403	err = register_netdevice(master);
	404	if (err < 0)
	405	goto err2;
	406
	407	strcpy(dlci->devname, master->name);
	408
	409	list_add(&dlp->list, &dlci_devs);
	410	rtnl_unlock();
	411
	412	return(0);
	413
	414	err2:
	415	rtnl_unlock();
	416	free_netdev(master);
	417	err1:
	418	dev_put(slave);
	419	return(err);
	420	}
	421
	422	static int dlci_del(struct dlci_add *dlci)
	423	{
	424	struct dlci_local *dlp;
	425	struct frad_local *flp;
	426	struct net_device master, slave;
	427	int err;
	428
429	/* validate slave device */
881d966b	430	master = __dev_get_by_name(&init_net, dlci->devname);
1da177e4 LT	431	if (!master)
	432	return(-ENODEV);
	433
	434	if (netif_running(master)) {
	435	return(-EBUSY);
	436	}
	437
	438	dlp = master->priv;
	439	slave = dlp->slave;
	440	flp = slave->priv;
	441
	442	rtnl_lock();
	443	err = (*flp->deassoc)(slave, master);
	444	if (!err) {
	445	list_del(&dlp->list);
	446
	447	unregister_netdevice(master);
	448
	449	dev_put(slave);
	450	}
	451	rtnl_unlock();
	452
	453	return(err);
	454	}
	455
	456	static int dlci_ioctl(unsigned int cmd, void __user *arg)
	457	{
	458	struct dlci_add add;
	459	int err;
	460
	461	if (!capable(CAP_NET_ADMIN))
	462	return(-EPERM);
	463
	464	if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
	465	return -EFAULT;
	466
	467	switch (cmd)
	468	{
	469	case SIOCADDDLCI:
	470	err = dlci_add(&add);
	471
	472	if (!err)
	473	if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
	474	return -EFAULT;
	475	break;
	476
	477	case SIOCDELDLCI:
	478	err = dlci_del(&add);
	479	break;
	480
	481	default:
	482	err = -EINVAL;
	483	}
	484
	485	return(err);
	486	}
	487
	488	static void dlci_setup(struct net_device *dev)
	489	{
	490	struct dlci_local *dlp = dev->priv;
	491
	492	dev->flags = 0;
	493	dev->open = dlci_open;
	494	dev->stop = dlci_close;
495	dev->do_ioctl = dlci_dev_ioctl;
496	dev->hard_start_xmit = dlci_transmit;
497	dev->hard_header = dlci_header;
498	dev->get_stats = dlci_get_stats;
499	dev->change_mtu = dlci_change_mtu;
500	dev->destructor = free_netdev;
501
502	dlp->receive = dlci_receive;
503
504	dev->type = ARPHRD_DLCI;
505	dev->hard_header_len = sizeof(struct frhdr);
506	dev->addr_len = sizeof(short);
507
508	}
509
510	/* if slave is unregistering, then cleanup master */
511	static int dlci_dev_event(struct notifier_block *unused,
512	unsigned long event, void *ptr)
513	{
514	struct net_device dev = (struct net_device ) ptr;
515
e9dc8653 EB	516	if (dev->nd_net != &init_net)
	517	return NOTIFY_DONE;
	518
1da177e4 LT	519	if (event == NETDEV_UNREGISTER) {
	520	struct dlci_local *dlp;
	521
	522	list_for_each_entry(dlp, &dlci_devs, list) {
	523	if (dlp->slave == dev) {
	524	list_del(&dlp->list);
	525	unregister_netdevice(dlp->master);
	526	dev_put(dlp->slave);
	527	break;
	528	}
	529	}
	530	}
	531	return NOTIFY_DONE;
	532	}
	533
	534	static struct notifier_block dlci_notifier = {
	535	.notifier_call = dlci_dev_event,
	536	};
	537
	538	static int __init init_dlci(void)
	539	{
	540	dlci_ioctl_set(dlci_ioctl);
	541	register_netdevice_notifier(&dlci_notifier);
	542
	543	printk("%s.\n", version);
	544
	545	return 0;
	546	}
	547
	548	static void __exit dlci_exit(void)
	549	{
	550	struct dlci_local dlp, nxt;
	551
	552	dlci_ioctl_set(NULL);
	553	unregister_netdevice_notifier(&dlci_notifier);
	554
	555	rtnl_lock();
	556	list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
	557	unregister_netdevice(dlp->master);
	558	dev_put(dlp->slave);
	559	}
	560	rtnl_unlock();
	561	}
	562
	563	module_init(init_dlci);
	564	module_exit(dlci_exit);
	565
	566	MODULE_AUTHOR("Mike McLagan");
	567	MODULE_DESCRIPTION("Frame Relay DLCI layer");
	568	MODULE_LICENSE("GPL");