[mirror_ubuntu-jammy-kernel.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, const void *daddr,
		       const void *saddr, unsigned len)
{
	struct frhdr		hdr;
	struct dlci_local	*dlp;
	unsigned int		hlen;
	char			*dest;

	dlp = netdev_priv(dev);

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

			default:
				printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
				dev->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);
		dev->stats.rx_bytes += skb->len;
		netif_rx(skb);
		dev->stats.rx_packets++;
	}
	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 = netdev_priv(dev);

	netif_stop_queue(dev);
	
	ret = dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
	switch (ret)
	{
		case DLCI_RET_OK:
			dev->stats.tx_packets++;
			ret = NETDEV_TX_OK;
			break;
			case DLCI_RET_ERR:
			dev->stats.tx_errors++;
			ret = NETDEV_TX_OK;
			break;
			case DLCI_RET_DROP:
			dev->stats.tx_dropped++;
			ret = NETDEV_TX_BUSY;
			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 = netdev_priv(dev);

	flp = netdev_priv(dlp->slave);

	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 = netdev_priv(dev);

	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 = netdev_priv(dev);

	return dev_set_mtu(dlp->slave, new_mtu);
}

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

	dlp = netdev_priv(dev);

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

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

	flp = netdev_priv(dlp->slave);
	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 = netdev_priv(dev);

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

	return 0;
}

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 || netdev_priv(slave) == 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 = netdev_priv(master);
	dlp->slave = slave;
	dlp->master = master;

	flp = netdev_priv(slave);
	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 = netdev_priv(master);
	slave = dlp->slave;
	flp = netdev_priv(slave);

	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 const struct header_ops dlci_header_ops = {
	.create	= dlci_header,
};

static const struct net_device_ops dlci_netdev_ops = {
	.ndo_open	= dlci_open,
	.ndo_stop	= dlci_close,
	.ndo_do_ioctl	= dlci_dev_ioctl,
	.ndo_start_xmit	= dlci_transmit,
	.ndo_change_mtu	= dlci_change_mtu,
};

static void dlci_setup(struct net_device *dev)
{
	struct dlci_local *dlp = netdev_priv(dev);

	dev->flags		= 0;
	dev->header_ops		= &dlci_header_ops;
	dev->netdev_ops		= &dlci_netdev_ops;
	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_net(dev) != &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,
3b04ddde SH	69	unsigned short type, const void *daddr,
3b04ddde SH	70	const void *saddr, unsigned len)
1da177e4 LT	71	{
	72	struct frhdr hdr;
	73	struct dlci_local *dlp;
	74	unsigned int hlen;
	75	char *dest;
	76
8f15ea42	77	dlp = netdev_priv(dev);
1da177e4 LT	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
8f15ea42	113	dlp = netdev_priv(dev);
1da177e4 LT	114	if (!pskb_may_pull(skb, sizeof(*hdr))) {
	115	printk(KERN_NOTICE "%s: invalid data no header\n",
	116	dev->name);
07d117cf	117	dev->stats.rx_errors++;
1da177e4 LT	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);
07d117cf	130	dev->stats.rx_errors++;
1da177e4 LT	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);
07d117cf	139	dev->stats.rx_errors++;
1da177e4 LT	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]);
07d117cf	146	dev->stats.rx_errors++;
1da177e4 LT	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);
07d117cf	167	dev->stats.rx_errors++;
1da177e4 LT	168	break;
	169
	170	default:
	171	printk(KERN_NOTICE "%s: Invalid pad byte 0x%02X.\n", dev->name, hdr->pad);
07d117cf	172	dev->stats.rx_errors++;
1da177e4 LT	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	180	skb_pull(skb, header);
07d117cf	181	dev->stats.rx_bytes += skb->len;
1da177e4	182	netif_rx(skb);
07d117cf	183	dev->stats.rx_packets++;
1da177e4 LT	184	}
	185	else
	186	dev_kfree_skb(skb);
	187	}
	188
	189	static int dlci_transmit(struct sk_buff skb, struct net_device dev)
	190	{
	191	struct dlci_local *dlp;
	192	int ret;
	193
	194	ret = 0;
	195
	196	if (!skb \|\| !dev)
	197	return(0);
	198
8f15ea42	199	dlp = netdev_priv(dev);
1da177e4 LT	200
	201	netif_stop_queue(dev);
	202
49e8abaf	203	ret = dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
1da177e4 LT	204	switch (ret)
	205	{
	206	case DLCI_RET_OK:
07d117cf	207	dev->stats.tx_packets++;
5b548140	208	ret = NETDEV_TX_OK;
1da177e4 LT	209	break;
1da177e4 LT	210	case DLCI_RET_ERR:
07d117cf	211	dev->stats.tx_errors++;
5b548140	212	ret = NETDEV_TX_OK;
1da177e4 LT	213	break;
1da177e4 LT	214	case DLCI_RET_DROP:
07d117cf	215	dev->stats.tx_dropped++;
5b548140	216	ret = NETDEV_TX_BUSY;
1da177e4 LT	217	break;
	218	}
	219	/* Alan Cox recommends always returning 0, and always freeing the packet */
	220	/* experience suggest a slightly more conservative approach */
	221
	222	if (!ret)
	223	{
	224	dev_kfree_skb(skb);
	225	netif_wake_queue(dev);
	226	}
	227	return(ret);
	228	}
	229
	230	static int dlci_config(struct net_device dev, struct dlci_conf __user conf, int get)
	231	{
	232	struct dlci_conf config;
	233	struct dlci_local *dlp;
	234	struct frad_local *flp;
	235	int err;
	236
8f15ea42	237	dlp = netdev_priv(dev);
1da177e4	238
8f15ea42	239	flp = netdev_priv(dlp->slave);
1da177e4 LT	240
	241	if (!get)
	242	{
	243	if(copy_from_user(&config, conf, sizeof(struct dlci_conf)))
	244	return -EFAULT;
	245	if (config.flags & ~DLCI_VALID_FLAGS)
	246	return(-EINVAL);
	247	memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
	248	dlp->configured = 1;
	249	}
	250
	251	err = (*flp->dlci_conf)(dlp->slave, dev, get);
	252	if (err)
	253	return(err);
	254
	255	if (get)
	256	{
	257	if(copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
	258	return -EFAULT;
	259	}
	260
	261	return(0);
	262	}
	263
	264	static int dlci_dev_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	265	{
	266	struct dlci_local *dlp;
	267
	268	if (!capable(CAP_NET_ADMIN))
	269	return(-EPERM);
	270
8f15ea42	271	dlp = netdev_priv(dev);
1da177e4 LT	272
	273	switch(cmd)
	274	{
	275	case DLCI_GET_SLAVE:
	276	if (!(short )(dev->dev_addr))
	277	return(-EINVAL);
	278
	279	strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
	280	break;
	281
	282	case DLCI_GET_CONF:
	283	case DLCI_SET_CONF:
	284	if (!(short )(dev->dev_addr))
	285	return(-EINVAL);
	286
	287	return(dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF));
	288	break;
	289
	290	default:
	291	return(-EOPNOTSUPP);
	292	}
	293	return(0);
	294	}
	295
	296	static int dlci_change_mtu(struct net_device *dev, int new_mtu)
	297	{
49e8abaf	298	struct dlci_local *dlp = netdev_priv(dev);
1da177e4	299
49e8abaf	300	return dev_set_mtu(dlp->slave, new_mtu);
1da177e4 LT	301	}
	302
	303	static int dlci_open(struct net_device *dev)
	304	{
	305	struct dlci_local *dlp;
	306	struct frad_local *flp;
	307	int err;
	308
8f15ea42	309	dlp = netdev_priv(dev);
1da177e4 LT	310
	311	if (!(short )(dev->dev_addr))
	312	return(-EINVAL);
	313
	314	if (!netif_running(dlp->slave))
	315	return(-ENOTCONN);
	316
8f15ea42	317	flp = netdev_priv(dlp->slave);
1da177e4 LT	318	err = (*flp->activate)(dlp->slave, dev);
	319	if (err)
	320	return(err);
	321
	322	netif_start_queue(dev);
	323
	324	return 0;
	325	}
	326
	327	static int dlci_close(struct net_device *dev)
	328	{
	329	struct dlci_local *dlp;
	330	struct frad_local *flp;
	331	int err;
	332
	333	netif_stop_queue(dev);
	334
8f15ea42	335	dlp = netdev_priv(dev);
1da177e4	336
8f15ea42	337	flp = netdev_priv(dlp->slave);
1da177e4 LT	338	err = (*flp->deactivate)(dlp->slave, dev);
	339
	340	return 0;
	341	}
	342
1da177e4 LT	343	static int dlci_add(struct dlci_add *dlci)
	344	{
	345	struct net_device master, slave;
	346	struct dlci_local *dlp;
	347	struct frad_local *flp;
	348	int err = -EINVAL;
	349
	350
	351	/* validate slave device */
881d966b	352	slave = dev_get_by_name(&init_net, dlci->devname);
1da177e4 LT	353	if (!slave)
	354	return -ENODEV;
	355
8f15ea42	356	if (slave->type != ARPHRD_FRAD \|\| netdev_priv(slave) == NULL)
1da177e4 LT	357	goto err1;
	358
	359	/* create device name */
	360	master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
	361	dlci_setup);
	362	if (!master) {
	363	err = -ENOMEM;
	364	goto err1;
	365	}
	366
	367	/* make sure same slave not already registered */
	368	rtnl_lock();
	369	list_for_each_entry(dlp, &dlci_devs, list) {
	370	if (dlp->slave == slave) {
	371	err = -EBUSY;
	372	goto err2;
	373	}
	374	}
	375
	376	err = dev_alloc_name(master, master->name);
	377	if (err < 0)
	378	goto err2;
	379
	380	(short )(master->dev_addr) = dlci->dlci;
	381
8f15ea42	382	dlp = netdev_priv(master);
1da177e4 LT	383	dlp->slave = slave;
	384	dlp->master = master;
	385
8f15ea42	386	flp = netdev_priv(slave);
1da177e4 LT	387	err = (*flp->assoc)(slave, master);
	388	if (err < 0)
	389	goto err2;
	390
	391	err = register_netdevice(master);
	392	if (err < 0)
	393	goto err2;
	394
	395	strcpy(dlci->devname, master->name);
	396
	397	list_add(&dlp->list, &dlci_devs);
	398	rtnl_unlock();
	399
	400	return(0);
	401
	402	err2:
	403	rtnl_unlock();
	404	free_netdev(master);
	405	err1:
	406	dev_put(slave);
	407	return(err);
	408	}
	409
	410	static int dlci_del(struct dlci_add *dlci)
	411	{
	412	struct dlci_local *dlp;
	413	struct frad_local *flp;
	414	struct net_device master, slave;
	415	int err;
	416
	417	/* validate slave device */
881d966b	418	master = __dev_get_by_name(&init_net, dlci->devname);
1da177e4 LT	419	if (!master)
	420	return(-ENODEV);
	421
	422	if (netif_running(master)) {
	423	return(-EBUSY);
	424	}
	425
8f15ea42	426	dlp = netdev_priv(master);
1da177e4	427	slave = dlp->slave;
8f15ea42	428	flp = netdev_priv(slave);
1da177e4 LT	429
	430	rtnl_lock();
	431	err = (*flp->deassoc)(slave, master);
	432	if (!err) {
	433	list_del(&dlp->list);
	434
	435	unregister_netdevice(master);
	436
	437	dev_put(slave);
	438	}
	439	rtnl_unlock();
	440
	441	return(err);
	442	}
	443
	444	static int dlci_ioctl(unsigned int cmd, void __user *arg)
	445	{
	446	struct dlci_add add;
	447	int err;
	448
	449	if (!capable(CAP_NET_ADMIN))
	450	return(-EPERM);
	451
	452	if(copy_from_user(&add, arg, sizeof(struct dlci_add)))
	453	return -EFAULT;
	454
	455	switch (cmd)
	456	{
	457	case SIOCADDDLCI:
	458	err = dlci_add(&add);
	459
	460	if (!err)
	461	if(copy_to_user(arg, &add, sizeof(struct dlci_add)))
	462	return -EFAULT;
	463	break;
	464
	465	case SIOCDELDLCI:
	466	err = dlci_del(&add);
	467	break;
	468
	469	default:
	470	err = -EINVAL;
	471	}
	472
	473	return(err);
	474	}
	475
3b04ddde SH	476	static const struct header_ops dlci_header_ops = {
	477	.create = dlci_header,
	478	};
	479
49e8abaf SH	480	static const struct net_device_ops dlci_netdev_ops = {
	481	.ndo_open = dlci_open,
	482	.ndo_stop = dlci_close,
	483	.ndo_do_ioctl = dlci_dev_ioctl,
	484	.ndo_start_xmit = dlci_transmit,
	485	.ndo_change_mtu = dlci_change_mtu,
	486	};
	487
1da177e4 LT	488	static void dlci_setup(struct net_device *dev)
1da177e4 LT	489	{
8f15ea42	490	struct dlci_local *dlp = netdev_priv(dev);
1da177e4 LT	491
1da177e4 LT	492	dev->flags = 0;
3b04ddde	493	dev->header_ops = &dlci_header_ops;
49e8abaf	494	dev->netdev_ops = &dlci_netdev_ops;
1da177e4 LT	495	dev->destructor = free_netdev;
	496
	497	dlp->receive = dlci_receive;
	498
	499	dev->type = ARPHRD_DLCI;
	500	dev->hard_header_len = sizeof(struct frhdr);
	501	dev->addr_len = sizeof(short);
	502
	503	}
	504
	505	/* if slave is unregistering, then cleanup master */
	506	static int dlci_dev_event(struct notifier_block *unused,
	507	unsigned long event, void *ptr)
	508	{
	509	struct net_device dev = (struct net_device ) ptr;
	510
c346dca1	511	if (dev_net(dev) != &init_net)
e9dc8653 EB	512	return NOTIFY_DONE;
e9dc8653 EB	513
1da177e4 LT	514	if (event == NETDEV_UNREGISTER) {
	515	struct dlci_local *dlp;
	516
	517	list_for_each_entry(dlp, &dlci_devs, list) {
	518	if (dlp->slave == dev) {
	519	list_del(&dlp->list);
	520	unregister_netdevice(dlp->master);
	521	dev_put(dlp->slave);
	522	break;
	523	}
	524	}
	525	}
	526	return NOTIFY_DONE;
	527	}
	528
	529	static struct notifier_block dlci_notifier = {
	530	.notifier_call = dlci_dev_event,
	531	};
	532
	533	static int __init init_dlci(void)
	534	{
	535	dlci_ioctl_set(dlci_ioctl);
	536	register_netdevice_notifier(&dlci_notifier);
	537
	538	printk("%s.\n", version);
	539
	540	return 0;
	541	}
	542
	543	static void __exit dlci_exit(void)
	544	{
	545	struct dlci_local dlp, nxt;
	546
	547	dlci_ioctl_set(NULL);
	548	unregister_netdevice_notifier(&dlci_notifier);
	549
	550	rtnl_lock();
	551	list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
	552	unregister_netdevice(dlp->master);
	553	dev_put(dlp->slave);
	554	}
	555	rtnl_unlock();
	556	}
	557
	558	module_init(init_dlci);
	559	module_exit(dlci_exit);
	560
	561	MODULE_AUTHOR("Mike McLagan");
	562	MODULE_DESCRIPTION("Frame Relay DLCI layer");
	563	MODULE_LICENSE("GPL");