[GitHub/mt8127/android_kernel_alcatel_ttab.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.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#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/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))) {
		netdev_notice(dev, "invalid data no header\n");
		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)
	{
		netdev_notice(dev, "Invalid header flag 0x%02X\n",
			      hdr->control);
		dev->stats.rx_errors++;
	}
	else
		switch (hdr->IP_NLPID)
		{
			case FRAD_P_PADDING:
				if (hdr->NLPID != FRAD_P_SNAP)
				{
					netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
						      hdr->NLPID);
					dev->stats.rx_errors++;
					break;
				}
	 
				if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
				{
					netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n",
						      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:
				netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
					      hdr->pad);
				dev->stats.rx_errors++;
				break;

			default:
				netdev_notice(dev, "Invalid pad byte 0x%02X\n",
					      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 netdev_tx_t dlci_transmit(struct sk_buff *skb, struct net_device *dev)
{
	struct dlci_local *dlp = netdev_priv(dev);

	if (skb)
		dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
	return NETDEV_TX_OK;
}

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;
		}
	}

	*(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;
	bool			found = false;

	rtnl_lock();

	/* validate slave device */
	master = __dev_get_by_name(&init_net, dlci->devname);
	if (!master) {
		err = -ENODEV;
		goto out;
	}

	list_for_each_entry(dlp, &dlci_devs, list) {
		if (dlp->master == master) {
			found = true;
			break;
		}
	}
	if (!found) {
		err = -ENODEV;
		goto out;
	}

	if (netif_running(master)) {
		err = -EBUSY;
		goto out;
	}

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

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

		unregister_netdevice(master);

		dev_put(slave);
	}
out:
	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
	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
	31	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
	32
	33	#include <linux/module.h>
	34	#include <linux/kernel.h>
	35	#include <linux/types.h>
	36	#include <linux/fcntl.h>
	37	#include <linux/interrupt.h>
	38	#include <linux/ptrace.h>
	39	#include <linux/ioport.h>
	40	#include <linux/in.h>
	41	#include <linux/init.h>
	42	#include <linux/slab.h>
	43	#include <linux/string.h>
	44	#include <linux/errno.h>
	45	#include <linux/netdevice.h>
	46	#include <linux/skbuff.h>
	47	#include <linux/if_arp.h>
	48	#include <linux/if_frad.h>
	49	#include <linux/bitops.h>
	50
	51	#include <net/sock.h>
	52
	53	#include <asm/io.h>
	54	#include <asm/dma.h>
	55	#include <asm/uaccess.h>
	56
	57	static const char version[] = "DLCI driver v0.35, 4 Jan 1997, mike.mclagan@linux.org";
	58
	59	static LIST_HEAD(dlci_devs);
	60
	61	static void dlci_setup(struct net_device *);
	62
	63	/*
	64	* these encapsulate the RFC 1490 requirements as well as
	65	* deal with packet transmission and reception, working with
	66	* the upper network layers
	67	*/
	68
	69	static int dlci_header(struct sk_buff skb, struct net_device dev,
	70	unsigned short type, const void *daddr,
	71	const void *saddr, unsigned len)
	72	{
	73	struct frhdr hdr;
	74	struct dlci_local *dlp;
	75	unsigned int hlen;
	76	char *dest;
	77
	78	dlp = netdev_priv(dev);
	79
	80	hdr.control = FRAD_I_UI;
	81	switch (type)
	82	{
	83	case ETH_P_IP:
	84	hdr.IP_NLPID = FRAD_P_IP;
	85	hlen = sizeof(hdr.control) + sizeof(hdr.IP_NLPID);
	86	break;
	87
	88	/* feel free to add other types, if necessary */
	89
	90	default:
	91	hdr.pad = FRAD_P_PADDING;
	92	hdr.NLPID = FRAD_P_SNAP;
	93	memset(hdr.OUI, 0, sizeof(hdr.OUI));
	94	hdr.PID = htons(type);
	95	hlen = sizeof(hdr);
	96	break;
	97	}
	98
	99	dest = skb_push(skb, hlen);
	100	if (!dest)
	101	return 0;
	102
	103	memcpy(dest, &hdr, hlen);
	104
	105	return hlen;
	106	}
	107
	108	static void dlci_receive(struct sk_buff skb, struct net_device dev)
	109	{
	110	struct dlci_local *dlp;
	111	struct frhdr *hdr;
	112	int process, header;
	113
	114	dlp = netdev_priv(dev);
	115	if (!pskb_may_pull(skb, sizeof(*hdr))) {
	116	netdev_notice(dev, "invalid data no header\n");
	117	dev->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	netdev_notice(dev, "Invalid header flag 0x%02X\n",
	130	hdr->control);
	131	dev->stats.rx_errors++;
	132	}
	133	else
	134	switch (hdr->IP_NLPID)
	135	{
	136	case FRAD_P_PADDING:
	137	if (hdr->NLPID != FRAD_P_SNAP)
	138	{
	139	netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
	140	hdr->NLPID);
	141	dev->stats.rx_errors++;
	142	break;
	143	}
	144
	145	if (hdr->OUI[0] + hdr->OUI[1] + hdr->OUI[2] != 0)
	146	{
	147	netdev_notice(dev, "Unsupported organizationally unique identifier 0x%02X-%02X-%02X\n",
	148	hdr->OUI[0],
	149	hdr->OUI[1],
	150	hdr->OUI[2]);
	151	dev->stats.rx_errors++;
	152	break;
	153	}
	154
	155	/* at this point, it's an EtherType frame */
	156	header = sizeof(struct frhdr);
	157	/* Already in network order ! */
	158	skb->protocol = hdr->PID;
	159	process = 1;
	160	break;
	161
	162	case FRAD_P_IP:
	163	header = sizeof(hdr->control) + sizeof(hdr->IP_NLPID);
	164	skb->protocol = htons(ETH_P_IP);
	165	process = 1;
	166	break;
	167
	168	case FRAD_P_SNAP:
	169	case FRAD_P_Q933:
	170	case FRAD_P_CLNP:
	171	netdev_notice(dev, "Unsupported NLPID 0x%02X\n",
	172	hdr->pad);
	173	dev->stats.rx_errors++;
	174	break;
	175
	176	default:
	177	netdev_notice(dev, "Invalid pad byte 0x%02X\n",
	178	hdr->pad);
	179	dev->stats.rx_errors++;
	180	break;
	181	}
	182
	183	if (process)
	184	{
	185	/* we've set up the protocol, so discard the header */
	186	skb_reset_mac_header(skb);
	187	skb_pull(skb, header);
	188	dev->stats.rx_bytes += skb->len;
	189	netif_rx(skb);
	190	dev->stats.rx_packets++;
	191	}
	192	else
	193	dev_kfree_skb(skb);
	194	}
	195
	196	static netdev_tx_t dlci_transmit(struct sk_buff skb, struct net_device dev)
	197	{
	198	struct dlci_local *dlp = netdev_priv(dev);
	199
	200	if (skb)
	201	dlp->slave->netdev_ops->ndo_start_xmit(skb, dlp->slave);
	202	return NETDEV_TX_OK;
	203	}
	204
	205	static int dlci_config(struct net_device dev, struct dlci_conf __user conf, int get)
	206	{
	207	struct dlci_conf config;
	208	struct dlci_local *dlp;
	209	struct frad_local *flp;
	210	int err;
	211
	212	dlp = netdev_priv(dev);
	213
	214	flp = netdev_priv(dlp->slave);
	215
	216	if (!get)
	217	{
	218	if (copy_from_user(&config, conf, sizeof(struct dlci_conf)))
	219	return -EFAULT;
	220	if (config.flags & ~DLCI_VALID_FLAGS)
	221	return -EINVAL;
	222	memcpy(&dlp->config, &config, sizeof(struct dlci_conf));
	223	dlp->configured = 1;
	224	}
	225
	226	err = (*flp->dlci_conf)(dlp->slave, dev, get);
	227	if (err)
	228	return err;
	229
	230	if (get)
	231	{
	232	if (copy_to_user(conf, &dlp->config, sizeof(struct dlci_conf)))
	233	return -EFAULT;
	234	}
	235
	236	return 0;
	237	}
	238
	239	static int dlci_dev_ioctl(struct net_device dev, struct ifreq ifr, int cmd)
	240	{
	241	struct dlci_local *dlp;
	242
	243	if (!capable(CAP_NET_ADMIN))
	244	return -EPERM;
	245
	246	dlp = netdev_priv(dev);
	247
	248	switch (cmd)
	249	{
	250	case DLCI_GET_SLAVE:
	251	if (!(short )(dev->dev_addr))
	252	return -EINVAL;
	253
	254	strncpy(ifr->ifr_slave, dlp->slave->name, sizeof(ifr->ifr_slave));
	255	break;
	256
	257	case DLCI_GET_CONF:
	258	case DLCI_SET_CONF:
	259	if (!(short )(dev->dev_addr))
	260	return -EINVAL;
	261
	262	return dlci_config(dev, ifr->ifr_data, cmd == DLCI_GET_CONF);
	263	break;
	264
	265	default:
	266	return -EOPNOTSUPP;
	267	}
	268	return 0;
	269	}
	270
	271	static int dlci_change_mtu(struct net_device *dev, int new_mtu)
	272	{
	273	struct dlci_local *dlp = netdev_priv(dev);
	274
	275	return dev_set_mtu(dlp->slave, new_mtu);
	276	}
	277
	278	static int dlci_open(struct net_device *dev)
	279	{
	280	struct dlci_local *dlp;
	281	struct frad_local *flp;
	282	int err;
	283
	284	dlp = netdev_priv(dev);
	285
	286	if (!(short )(dev->dev_addr))
	287	return -EINVAL;
	288
	289	if (!netif_running(dlp->slave))
	290	return -ENOTCONN;
	291
	292	flp = netdev_priv(dlp->slave);
	293	err = (*flp->activate)(dlp->slave, dev);
	294	if (err)
	295	return err;
	296
	297	netif_start_queue(dev);
	298
	299	return 0;
	300	}
	301
	302	static int dlci_close(struct net_device *dev)
	303	{
	304	struct dlci_local *dlp;
	305	struct frad_local *flp;
	306	int err;
	307
	308	netif_stop_queue(dev);
	309
	310	dlp = netdev_priv(dev);
	311
	312	flp = netdev_priv(dlp->slave);
	313	err = (*flp->deactivate)(dlp->slave, dev);
	314
	315	return 0;
	316	}
	317
	318	static int dlci_add(struct dlci_add *dlci)
	319	{
	320	struct net_device master, slave;
	321	struct dlci_local *dlp;
	322	struct frad_local *flp;
	323	int err = -EINVAL;
	324
	325
	326	/* validate slave device */
	327	slave = dev_get_by_name(&init_net, dlci->devname);
	328	if (!slave)
	329	return -ENODEV;
	330
	331	if (slave->type != ARPHRD_FRAD \|\| netdev_priv(slave) == NULL)
	332	goto err1;
	333
	334	/* create device name */
	335	master = alloc_netdev( sizeof(struct dlci_local), "dlci%d",
	336	dlci_setup);
	337	if (!master) {
	338	err = -ENOMEM;
	339	goto err1;
	340	}
	341
	342	/* make sure same slave not already registered */
	343	rtnl_lock();
	344	list_for_each_entry(dlp, &dlci_devs, list) {
	345	if (dlp->slave == slave) {
	346	err = -EBUSY;
	347	goto err2;
	348	}
	349	}
	350
	351	(short )(master->dev_addr) = dlci->dlci;
	352
	353	dlp = netdev_priv(master);
	354	dlp->slave = slave;
	355	dlp->master = master;
	356
	357	flp = netdev_priv(slave);
	358	err = (*flp->assoc)(slave, master);
	359	if (err < 0)
	360	goto err2;
	361
	362	err = register_netdevice(master);
	363	if (err < 0)
	364	goto err2;
	365
	366	strcpy(dlci->devname, master->name);
	367
	368	list_add(&dlp->list, &dlci_devs);
	369	rtnl_unlock();
	370
	371	return 0;
	372
	373	err2:
	374	rtnl_unlock();
	375	free_netdev(master);
	376	err1:
	377	dev_put(slave);
	378	return err;
	379	}
	380
	381	static int dlci_del(struct dlci_add *dlci)
	382	{
	383	struct dlci_local *dlp;
	384	struct frad_local *flp;
	385	struct net_device master, slave;
	386	int err;
	387	bool found = false;
	388
	389	rtnl_lock();
	390
	391	/* validate slave device */
	392	master = __dev_get_by_name(&init_net, dlci->devname);
	393	if (!master) {
	394	err = -ENODEV;
	395	goto out;
	396	}
	397
	398	list_for_each_entry(dlp, &dlci_devs, list) {
	399	if (dlp->master == master) {
	400	found = true;
	401	break;
	402	}
	403	}
	404	if (!found) {
	405	err = -ENODEV;
	406	goto out;
	407	}
	408
	409	if (netif_running(master)) {
	410	err = -EBUSY;
	411	goto out;
	412	}
	413
	414	dlp = netdev_priv(master);
	415	slave = dlp->slave;
	416	flp = netdev_priv(slave);
	417
	418	err = (*flp->deassoc)(slave, master);
	419	if (!err) {
	420	list_del(&dlp->list);
	421
	422	unregister_netdevice(master);
	423
	424	dev_put(slave);
	425	}
	426	out:
	427	rtnl_unlock();
	428	return err;
	429	}
	430
	431	static int dlci_ioctl(unsigned int cmd, void __user *arg)
	432	{
	433	struct dlci_add add;
	434	int err;
	435
	436	if (!capable(CAP_NET_ADMIN))
	437	return -EPERM;
	438
	439	if (copy_from_user(&add, arg, sizeof(struct dlci_add)))
	440	return -EFAULT;
	441
	442	switch (cmd)
	443	{
	444	case SIOCADDDLCI:
	445	err = dlci_add(&add);
	446
	447	if (!err)
	448	if (copy_to_user(arg, &add, sizeof(struct dlci_add)))
	449	return -EFAULT;
	450	break;
	451
	452	case SIOCDELDLCI:
	453	err = dlci_del(&add);
	454	break;
	455
	456	default:
	457	err = -EINVAL;
	458	}
	459
	460	return err;
	461	}
	462
	463	static const struct header_ops dlci_header_ops = {
	464	.create = dlci_header,
	465	};
	466
	467	static const struct net_device_ops dlci_netdev_ops = {
	468	.ndo_open = dlci_open,
	469	.ndo_stop = dlci_close,
	470	.ndo_do_ioctl = dlci_dev_ioctl,
	471	.ndo_start_xmit = dlci_transmit,
	472	.ndo_change_mtu = dlci_change_mtu,
	473	};
	474
	475	static void dlci_setup(struct net_device *dev)
	476	{
	477	struct dlci_local *dlp = netdev_priv(dev);
	478
	479	dev->flags = 0;
	480	dev->header_ops = &dlci_header_ops;
	481	dev->netdev_ops = &dlci_netdev_ops;
	482	dev->destructor = free_netdev;
	483
	484	dlp->receive = dlci_receive;
	485
	486	dev->type = ARPHRD_DLCI;
	487	dev->hard_header_len = sizeof(struct frhdr);
	488	dev->addr_len = sizeof(short);
	489
	490	}
	491
	492	/* if slave is unregistering, then cleanup master */
	493	static int dlci_dev_event(struct notifier_block *unused,
	494	unsigned long event, void *ptr)
	495	{
	496	struct net_device dev = (struct net_device ) ptr;
	497
	498	if (dev_net(dev) != &init_net)
	499	return NOTIFY_DONE;
	500
	501	if (event == NETDEV_UNREGISTER) {
	502	struct dlci_local *dlp;
	503
	504	list_for_each_entry(dlp, &dlci_devs, list) {
	505	if (dlp->slave == dev) {
	506	list_del(&dlp->list);
	507	unregister_netdevice(dlp->master);
	508	dev_put(dlp->slave);
	509	break;
	510	}
	511	}
	512	}
	513	return NOTIFY_DONE;
	514	}
	515
	516	static struct notifier_block dlci_notifier = {
	517	.notifier_call = dlci_dev_event,
	518	};
	519
	520	static int __init init_dlci(void)
	521	{
	522	dlci_ioctl_set(dlci_ioctl);
	523	register_netdevice_notifier(&dlci_notifier);
	524
	525	printk("%s.\n", version);
	526
	527	return 0;
	528	}
	529
	530	static void __exit dlci_exit(void)
	531	{
	532	struct dlci_local dlp, nxt;
	533
	534	dlci_ioctl_set(NULL);
	535	unregister_netdevice_notifier(&dlci_notifier);
	536
	537	rtnl_lock();
	538	list_for_each_entry_safe(dlp, nxt, &dlci_devs, list) {
	539	unregister_netdevice(dlp->master);
	540	dev_put(dlp->slave);
	541	}
	542	rtnl_unlock();
	543	}
	544
	545	module_init(init_dlci);
	546	module_exit(dlci_exit);
	547
	548	MODULE_AUTHOR("Mike McLagan");
	549	MODULE_DESCRIPTION("Frame Relay DLCI layer");
	550	MODULE_LICENSE("GPL");