[deliverable/linux.git] / net / core / net-sysfs.c

/*
 * net-sysfs.c - network device class and attributes
 *
 * Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
 *
 *	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/capability.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/if_arp.h>
#include <net/sock.h>
#include <linux/rtnetlink.h>
#include <linux/wireless.h>
#include <net/iw_handler.h>

#include "net-sysfs.h"

#ifdef CONFIG_SYSFS
static const char fmt_hex[] = "%#x\n";
static const char fmt_long_hex[] = "%#lx\n";
static const char fmt_dec[] = "%d\n";
static const char fmt_ulong[] = "%lu\n";

static inline int dev_isalive(const struct net_device *dev)
{
	return dev->reg_state <= NETREG_REGISTERED;
}

/* use same locking rules as GIF* ioctl's */
static ssize_t netdev_show(const struct device *dev,
			   struct device_attribute *attr, char *buf,
			   ssize_t (*format)(const struct net_device *, char *))
{
	struct net_device *net = to_net_dev(dev);
	ssize_t ret = -EINVAL;

	read_lock(&dev_base_lock);
	if (dev_isalive(net))
		ret = (*format)(net, buf);
	read_unlock(&dev_base_lock);

	return ret;
}

/* generate a show function for simple field */
#define NETDEVICE_SHOW(field, format_string)				\
static ssize_t format_##field(const struct net_device *net, char *buf)	\
{									\
	return sprintf(buf, format_string, net->field);			\
}									\
static ssize_t show_##field(struct device *dev,				\
			    struct device_attribute *attr, char *buf)	\
{									\
	return netdev_show(dev, attr, buf, format_##field);		\
}


/* use same locking and permission rules as SIF* ioctl's */
static ssize_t netdev_store(struct device *dev, struct device_attribute *attr,
			    const char *buf, size_t len,
			    int (*set)(struct net_device *, unsigned long))
{
	struct net_device *net = to_net_dev(dev);
	char *endp;
	unsigned long new;
	int ret = -EINVAL;

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

	new = simple_strtoul(buf, &endp, 0);
	if (endp == buf)
		goto err;

	rtnl_lock();
	if (dev_isalive(net)) {
		if ((ret = (*set)(net, new)) == 0)
			ret = len;
	}
	rtnl_unlock();
 err:
	return ret;
}

NETDEVICE_SHOW(dev_id, fmt_hex);
NETDEVICE_SHOW(addr_len, fmt_dec);
NETDEVICE_SHOW(iflink, fmt_dec);
NETDEVICE_SHOW(ifindex, fmt_dec);
NETDEVICE_SHOW(features, fmt_long_hex);
NETDEVICE_SHOW(type, fmt_dec);
NETDEVICE_SHOW(link_mode, fmt_dec);

/* use same locking rules as GIFHWADDR ioctl's */
static ssize_t show_address(struct device *dev, struct device_attribute *attr,
			    char *buf)
{
	struct net_device *net = to_net_dev(dev);
	ssize_t ret = -EINVAL;

	read_lock(&dev_base_lock);
	if (dev_isalive(net))
		ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
	read_unlock(&dev_base_lock);
	return ret;
}

static ssize_t show_broadcast(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct net_device *net = to_net_dev(dev);
	if (dev_isalive(net))
		return sysfs_format_mac(buf, net->broadcast, net->addr_len);
	return -EINVAL;
}

static ssize_t show_carrier(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct net_device *netdev = to_net_dev(dev);
	if (netif_running(netdev)) {
		return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
	}
	return -EINVAL;
}

static ssize_t show_dormant(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	struct net_device *netdev = to_net_dev(dev);

	if (netif_running(netdev))
		return sprintf(buf, fmt_dec, !!netif_dormant(netdev));

	return -EINVAL;
}

static const char *operstates[] = {
	"unknown",
	"notpresent", /* currently unused */
	"down",
	"lowerlayerdown",
	"testing", /* currently unused */
	"dormant",
	"up"
};

static ssize_t show_operstate(struct device *dev,
			      struct device_attribute *attr, char *buf)
{
	const struct net_device *netdev = to_net_dev(dev);
	unsigned char operstate;

	read_lock(&dev_base_lock);
	operstate = netdev->operstate;
	if (!netif_running(netdev))
		operstate = IF_OPER_DOWN;
	read_unlock(&dev_base_lock);

	if (operstate >= ARRAY_SIZE(operstates))
		return -EINVAL; /* should not happen */

	return sprintf(buf, "%s\n", operstates[operstate]);
}

/* read-write attributes */
NETDEVICE_SHOW(mtu, fmt_dec);

static int change_mtu(struct net_device *net, unsigned long new_mtu)
{
	return dev_set_mtu(net, (int) new_mtu);
}

static ssize_t store_mtu(struct device *dev, struct device_attribute *attr,
			 const char *buf, size_t len)
{
	return netdev_store(dev, attr, buf, len, change_mtu);
}

NETDEVICE_SHOW(flags, fmt_hex);

static int change_flags(struct net_device *net, unsigned long new_flags)
{
	return dev_change_flags(net, (unsigned) new_flags);
}

static ssize_t store_flags(struct device *dev, struct device_attribute *attr,
			   const char *buf, size_t len)
{
	return netdev_store(dev, attr, buf, len, change_flags);
}

NETDEVICE_SHOW(tx_queue_len, fmt_ulong);

static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
{
	net->tx_queue_len = new_len;
	return 0;
}

static ssize_t store_tx_queue_len(struct device *dev,
				  struct device_attribute *attr,
				  const char *buf, size_t len)
{
	return netdev_store(dev, attr, buf, len, change_tx_queue_len);
}

static ssize_t store_ifalias(struct device *dev, struct device_attribute *attr,
			     const char *buf, size_t len)
{
	struct net_device *netdev = to_net_dev(dev);
	size_t count = len;
	ssize_t ret;

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

	/* ignore trailing newline */
	if (len >  0 && buf[len - 1] == '\n')
		--count;

	rtnl_lock();
	ret = dev_set_alias(netdev, buf, count);
	rtnl_unlock();

	return ret < 0 ? ret : len;
}

static ssize_t show_ifalias(struct device *dev,
			    struct device_attribute *attr, char *buf)
{
	const struct net_device *netdev = to_net_dev(dev);
	ssize_t ret = 0;

	rtnl_lock();
	if (netdev->ifalias)
		ret = sprintf(buf, "%s\n", netdev->ifalias);
	rtnl_unlock();
	return ret;
}

static struct device_attribute net_class_attributes[] = {
	__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
	__ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
	__ATTR(ifalias, S_IRUGO | S_IWUSR, show_ifalias, store_ifalias),
	__ATTR(iflink, S_IRUGO, show_iflink, NULL),
	__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
	__ATTR(features, S_IRUGO, show_features, NULL),
	__ATTR(type, S_IRUGO, show_type, NULL),
	__ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
	__ATTR(address, S_IRUGO, show_address, NULL),
	__ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
	__ATTR(carrier, S_IRUGO, show_carrier, NULL),
	__ATTR(dormant, S_IRUGO, show_dormant, NULL),
	__ATTR(operstate, S_IRUGO, show_operstate, NULL),
	__ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_mtu),
	__ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_flags),
	__ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len,
	       store_tx_queue_len),
	{}
};

/* Show a given an attribute in the statistics group */
static ssize_t netstat_show(const struct device *d,
			    struct device_attribute *attr, char *buf,
			    unsigned long offset)
{
	struct net_device *dev = to_net_dev(d);
	struct net_device_stats *stats;
	ssize_t ret = -EINVAL;

	WARN_ON(offset > sizeof(struct net_device_stats) ||
			offset % sizeof(unsigned long) != 0);

	read_lock(&dev_base_lock);
	if (dev_isalive(dev)) {
		stats = dev->get_stats(dev);
		ret = sprintf(buf, fmt_ulong,
			      *(unsigned long *)(((u8 *) stats) + offset));
	}
	read_unlock(&dev_base_lock);
	return ret;
}

/* generate a read-only statistics attribute */
#define NETSTAT_ENTRY(name)						\
static ssize_t show_##name(struct device *d,				\
			   struct device_attribute *attr, char *buf) 	\
{									\
	return netstat_show(d, attr, buf,				\
			    offsetof(struct net_device_stats, name));	\
}									\
static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)

NETSTAT_ENTRY(rx_packets);
NETSTAT_ENTRY(tx_packets);
NETSTAT_ENTRY(rx_bytes);
NETSTAT_ENTRY(tx_bytes);
NETSTAT_ENTRY(rx_errors);
NETSTAT_ENTRY(tx_errors);
NETSTAT_ENTRY(rx_dropped);
NETSTAT_ENTRY(tx_dropped);
NETSTAT_ENTRY(multicast);
NETSTAT_ENTRY(collisions);
NETSTAT_ENTRY(rx_length_errors);
NETSTAT_ENTRY(rx_over_errors);
NETSTAT_ENTRY(rx_crc_errors);
NETSTAT_ENTRY(rx_frame_errors);
NETSTAT_ENTRY(rx_fifo_errors);
NETSTAT_ENTRY(rx_missed_errors);
NETSTAT_ENTRY(tx_aborted_errors);
NETSTAT_ENTRY(tx_carrier_errors);
NETSTAT_ENTRY(tx_fifo_errors);
NETSTAT_ENTRY(tx_heartbeat_errors);
NETSTAT_ENTRY(tx_window_errors);
NETSTAT_ENTRY(rx_compressed);
NETSTAT_ENTRY(tx_compressed);

static struct attribute *netstat_attrs[] = {
	&dev_attr_rx_packets.attr,
	&dev_attr_tx_packets.attr,
	&dev_attr_rx_bytes.attr,
	&dev_attr_tx_bytes.attr,
	&dev_attr_rx_errors.attr,
	&dev_attr_tx_errors.attr,
	&dev_attr_rx_dropped.attr,
	&dev_attr_tx_dropped.attr,
	&dev_attr_multicast.attr,
	&dev_attr_collisions.attr,
	&dev_attr_rx_length_errors.attr,
	&dev_attr_rx_over_errors.attr,
	&dev_attr_rx_crc_errors.attr,
	&dev_attr_rx_frame_errors.attr,
	&dev_attr_rx_fifo_errors.attr,
	&dev_attr_rx_missed_errors.attr,
	&dev_attr_tx_aborted_errors.attr,
	&dev_attr_tx_carrier_errors.attr,
	&dev_attr_tx_fifo_errors.attr,
	&dev_attr_tx_heartbeat_errors.attr,
	&dev_attr_tx_window_errors.attr,
	&dev_attr_rx_compressed.attr,
	&dev_attr_tx_compressed.attr,
	NULL
};


static struct attribute_group netstat_group = {
	.name  = "statistics",
	.attrs  = netstat_attrs,
};

#ifdef CONFIG_WIRELESS_EXT_SYSFS
/* helper function that does all the locking etc for wireless stats */
static ssize_t wireless_show(struct device *d, char *buf,
			     ssize_t (*format)(const struct iw_statistics *,
					       char *))
{
	struct net_device *dev = to_net_dev(d);
	const struct iw_statistics *iw = NULL;
	ssize_t ret = -EINVAL;

	read_lock(&dev_base_lock);
	if (dev_isalive(dev)) {
		if (dev->wireless_handlers &&
		    dev->wireless_handlers->get_wireless_stats)
			iw = dev->wireless_handlers->get_wireless_stats(dev);
		if (iw != NULL)
			ret = (*format)(iw, buf);
	}
	read_unlock(&dev_base_lock);

	return ret;
}

/* show function template for wireless fields */
#define WIRELESS_SHOW(name, field, format_string)			\
static ssize_t format_iw_##name(const struct iw_statistics *iw, char *buf) \
{									\
	return sprintf(buf, format_string, iw->field);			\
}									\
static ssize_t show_iw_##name(struct device *d,				\
			      struct device_attribute *attr, char *buf)	\
{									\
	return wireless_show(d, buf, format_iw_##name);			\
}									\
static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)

WIRELESS_SHOW(status, status, fmt_hex);
WIRELESS_SHOW(link, qual.qual, fmt_dec);
WIRELESS_SHOW(level, qual.level, fmt_dec);
WIRELESS_SHOW(noise, qual.noise, fmt_dec);
WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
WIRELESS_SHOW(crypt, discard.code, fmt_dec);
WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
WIRELESS_SHOW(misc, discard.misc, fmt_dec);
WIRELESS_SHOW(retries, discard.retries, fmt_dec);
WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);

static struct attribute *wireless_attrs[] = {
	&dev_attr_status.attr,
	&dev_attr_link.attr,
	&dev_attr_level.attr,
	&dev_attr_noise.attr,
	&dev_attr_nwid.attr,
	&dev_attr_crypt.attr,
	&dev_attr_fragment.attr,
	&dev_attr_retries.attr,
	&dev_attr_misc.attr,
	&dev_attr_beacon.attr,
	NULL
};

static struct attribute_group wireless_group = {
	.name = "wireless",
	.attrs = wireless_attrs,
};
#endif

#endif /* CONFIG_SYSFS */

#ifdef CONFIG_HOTPLUG
static int netdev_uevent(struct device *d, struct kobj_uevent_env *env)
{
	struct net_device *dev = to_net_dev(d);
	int retval;

	/* pass interface to uevent. */
	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
	if (retval)
		goto exit;

	/* pass ifindex to uevent.
	 * ifindex is useful as it won't change (interface name may change)
	 * and is what RtNetlink uses natively. */
	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);

exit:
	return retval;
}
#endif

/*
 *	netdev_release -- destroy and free a dead device.
 *	Called when last reference to device kobject is gone.
 */
static void netdev_release(struct device *d)
{
	struct net_device *dev = to_net_dev(d);

	BUG_ON(dev->reg_state != NETREG_RELEASED);

	kfree(dev->ifalias);
	kfree((char *)dev - dev->padded);
}

static struct class net_class = {
	.name = "net",
	.dev_release = netdev_release,
#ifdef CONFIG_SYSFS
	.dev_attrs = net_class_attributes,
#endif /* CONFIG_SYSFS */
#ifdef CONFIG_HOTPLUG
	.dev_uevent = netdev_uevent,
#endif
};

/* Delete sysfs entries but hold kobject reference until after all
 * netdev references are gone.
 */
void netdev_unregister_kobject(struct net_device * net)
{
	struct device *dev = &(net->dev);

	kobject_get(&dev->kobj);
	device_del(dev);
}

/* Create sysfs entries for network device. */
int netdev_register_kobject(struct net_device *net)
{
	struct device *dev = &(net->dev);
	struct attribute_group **groups = net->sysfs_groups;

	dev->class = &net_class;
	dev->platform_data = net;
	dev->groups = groups;

	BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
	strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);

#ifdef CONFIG_SYSFS
	*groups++ = &netstat_group;

#ifdef CONFIG_WIRELESS_EXT_SYSFS
	if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)
		*groups++ = &wireless_group;
#endif
#endif /* CONFIG_SYSFS */

	return device_add(dev);
}

int netdev_class_create_file(struct class_attribute *class_attr)
{
	return class_create_file(&net_class, class_attr);
}

void netdev_class_remove_file(struct class_attribute *class_attr)
{
	class_remove_file(&net_class, class_attr);
}

EXPORT_SYMBOL(netdev_class_create_file);
EXPORT_SYMBOL(netdev_class_remove_file);

void netdev_initialize_kobject(struct net_device *net)
{
	struct device *device = &(net->dev);
	device_initialize(device);
}

int netdev_kobject_init(void)
{
	return class_register(&net_class);
}
Commit	Line	Data
	1	/*
	2	* net-sysfs.c - network device class and attributes
	3	*
	4	* Copyright (c) 2003 Stephen Hemminger <shemminger@osdl.org>
	5	*
	6	* This program is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU General Public License
	8	* as published by the Free Software Foundation; either version
	9	* 2 of the License, or (at your option) any later version.
	10	*/
	11
	12	#include <linux/capability.h>
	13	#include <linux/kernel.h>
	14	#include <linux/netdevice.h>
	15	#include <linux/if_arp.h>
	16	#include <net/sock.h>
	17	#include <linux/rtnetlink.h>
	18	#include <linux/wireless.h>
	19	#include <net/iw_handler.h>
	20
	21	#include "net-sysfs.h"
	22
	23	#ifdef CONFIG_SYSFS
	24	static const char fmt_hex[] = "%#x\n";
	25	static const char fmt_long_hex[] = "%#lx\n";
	26	static const char fmt_dec[] = "%d\n";
	27	static const char fmt_ulong[] = "%lu\n";
	28
	29	static inline int dev_isalive(const struct net_device *dev)
	30	{
	31	return dev->reg_state <= NETREG_REGISTERED;
	32	}
	33
	34	/* use same locking rules as GIF* ioctl's */
	35	static ssize_t netdev_show(const struct device *dev,
	36	struct device_attribute attr, char buf,
	37	ssize_t (format)(const struct net_device , char *))
	38	{
	39	struct net_device *net = to_net_dev(dev);
	40	ssize_t ret = -EINVAL;
	41
	42	read_lock(&dev_base_lock);
	43	if (dev_isalive(net))
	44	ret = (*format)(net, buf);
	45	read_unlock(&dev_base_lock);
	46
	47	return ret;
	48	}
	49
	50	/* generate a show function for simple field */
	51	#define NETDEVICE_SHOW(field, format_string) \
	52	static ssize_t format_##field(const struct net_device net, char buf) \
	53	{ \
	54	return sprintf(buf, format_string, net->field); \
	55	} \
	56	static ssize_t show_##field(struct device *dev, \
	57	struct device_attribute attr, char buf) \
	58	{ \
	59	return netdev_show(dev, attr, buf, format_##field); \
	60	}
	61
	62
	63	/* use same locking and permission rules as SIF* ioctl's */
	64	static ssize_t netdev_store(struct device dev, struct device_attribute attr,
	65	const char *buf, size_t len,
	66	int (set)(struct net_device , unsigned long))
	67	{
	68	struct net_device *net = to_net_dev(dev);
	69	char *endp;
	70	unsigned long new;
	71	int ret = -EINVAL;
	72
	73	if (!capable(CAP_NET_ADMIN))
	74	return -EPERM;
	75
	76	new = simple_strtoul(buf, &endp, 0);
	77	if (endp == buf)
	78	goto err;
	79
	80	rtnl_lock();
	81	if (dev_isalive(net)) {
	82	if ((ret = (*set)(net, new)) == 0)
	83	ret = len;
	84	}
	85	rtnl_unlock();
	86	err:
	87	return ret;
	88	}
	89
	90	NETDEVICE_SHOW(dev_id, fmt_hex);
	91	NETDEVICE_SHOW(addr_len, fmt_dec);
	92	NETDEVICE_SHOW(iflink, fmt_dec);
	93	NETDEVICE_SHOW(ifindex, fmt_dec);
	94	NETDEVICE_SHOW(features, fmt_long_hex);
	95	NETDEVICE_SHOW(type, fmt_dec);
	96	NETDEVICE_SHOW(link_mode, fmt_dec);
	97
	98	/* use same locking rules as GIFHWADDR ioctl's */
	99	static ssize_t show_address(struct device dev, struct device_attribute attr,
	100	char *buf)
	101	{
	102	struct net_device *net = to_net_dev(dev);
	103	ssize_t ret = -EINVAL;
	104
	105	read_lock(&dev_base_lock);
	106	if (dev_isalive(net))
	107	ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
	108	read_unlock(&dev_base_lock);
	109	return ret;
	110	}
	111
	112	static ssize_t show_broadcast(struct device *dev,
	113	struct device_attribute attr, char buf)
	114	{
	115	struct net_device *net = to_net_dev(dev);
	116	if (dev_isalive(net))
	117	return sysfs_format_mac(buf, net->broadcast, net->addr_len);
	118	return -EINVAL;
	119	}
	120
	121	static ssize_t show_carrier(struct device *dev,
	122	struct device_attribute attr, char buf)
	123	{
	124	struct net_device *netdev = to_net_dev(dev);
	125	if (netif_running(netdev)) {
	126	return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
	127	}
	128	return -EINVAL;
	129	}
	130
	131	static ssize_t show_dormant(struct device *dev,
	132	struct device_attribute attr, char buf)
	133	{
	134	struct net_device *netdev = to_net_dev(dev);
	135
	136	if (netif_running(netdev))
	137	return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
	138
	139	return -EINVAL;
	140	}
	141
	142	static const char *operstates[] = {
	143	"unknown",
	144	"notpresent", /* currently unused */
	145	"down",
	146	"lowerlayerdown",
	147	"testing", /* currently unused */
	148	"dormant",
	149	"up"
	150	};
	151
	152	static ssize_t show_operstate(struct device *dev,
	153	struct device_attribute attr, char buf)
	154	{
	155	const struct net_device *netdev = to_net_dev(dev);
	156	unsigned char operstate;
	157
	158	read_lock(&dev_base_lock);
	159	operstate = netdev->operstate;
	160	if (!netif_running(netdev))
	161	operstate = IF_OPER_DOWN;
	162	read_unlock(&dev_base_lock);
	163
	164	if (operstate >= ARRAY_SIZE(operstates))
	165	return -EINVAL; /* should not happen */
	166
	167	return sprintf(buf, "%s\n", operstates[operstate]);
	168	}
	169
	170	/* read-write attributes */
	171	NETDEVICE_SHOW(mtu, fmt_dec);
	172
	173	static int change_mtu(struct net_device *net, unsigned long new_mtu)
	174	{
	175	return dev_set_mtu(net, (int) new_mtu);
	176	}
	177
	178	static ssize_t store_mtu(struct device dev, struct device_attribute attr,
	179	const char *buf, size_t len)
	180	{
	181	return netdev_store(dev, attr, buf, len, change_mtu);
	182	}
	183
	184	NETDEVICE_SHOW(flags, fmt_hex);
	185
	186	static int change_flags(struct net_device *net, unsigned long new_flags)
	187	{
	188	return dev_change_flags(net, (unsigned) new_flags);
	189	}
	190
	191	static ssize_t store_flags(struct device dev, struct device_attribute attr,
	192	const char *buf, size_t len)
	193	{
	194	return netdev_store(dev, attr, buf, len, change_flags);
	195	}
	196
	197	NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
	198
	199	static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
	200	{
	201	net->tx_queue_len = new_len;
	202	return 0;
	203	}
	204
	205	static ssize_t store_tx_queue_len(struct device *dev,
	206	struct device_attribute *attr,
	207	const char *buf, size_t len)
	208	{
	209	return netdev_store(dev, attr, buf, len, change_tx_queue_len);
	210	}
	211
	212	static ssize_t store_ifalias(struct device dev, struct device_attribute attr,
	213	const char *buf, size_t len)
	214	{
	215	struct net_device *netdev = to_net_dev(dev);
	216	size_t count = len;
	217	ssize_t ret;
	218
	219	if (!capable(CAP_NET_ADMIN))
	220	return -EPERM;
	221
	222	/* ignore trailing newline */
	223	if (len > 0 && buf[len - 1] == '\n')
	224	--count;
	225
	226	rtnl_lock();
	227	ret = dev_set_alias(netdev, buf, count);
	228	rtnl_unlock();
	229
	230	return ret < 0 ? ret : len;
	231	}
	232
	233	static ssize_t show_ifalias(struct device *dev,
	234	struct device_attribute attr, char buf)
	235	{
	236	const struct net_device *netdev = to_net_dev(dev);
	237	ssize_t ret = 0;
	238
	239	rtnl_lock();
	240	if (netdev->ifalias)
	241	ret = sprintf(buf, "%s\n", netdev->ifalias);
	242	rtnl_unlock();
	243	return ret;
	244	}
	245
	246	static struct device_attribute net_class_attributes[] = {
	247	__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
	248	__ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
	249	__ATTR(ifalias, S_IRUGO \| S_IWUSR, show_ifalias, store_ifalias),
	250	__ATTR(iflink, S_IRUGO, show_iflink, NULL),
	251	__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
	252	__ATTR(features, S_IRUGO, show_features, NULL),
	253	__ATTR(type, S_IRUGO, show_type, NULL),
	254	__ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
	255	__ATTR(address, S_IRUGO, show_address, NULL),
	256	__ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
	257	__ATTR(carrier, S_IRUGO, show_carrier, NULL),
	258	__ATTR(dormant, S_IRUGO, show_dormant, NULL),
	259	__ATTR(operstate, S_IRUGO, show_operstate, NULL),
	260	__ATTR(mtu, S_IRUGO \| S_IWUSR, show_mtu, store_mtu),
	261	__ATTR(flags, S_IRUGO \| S_IWUSR, show_flags, store_flags),
	262	__ATTR(tx_queue_len, S_IRUGO \| S_IWUSR, show_tx_queue_len,
	263	store_tx_queue_len),
	264	{}
	265	};
	266
	267	/* Show a given an attribute in the statistics group */
	268	static ssize_t netstat_show(const struct device *d,
	269	struct device_attribute attr, char buf,
	270	unsigned long offset)
	271	{
	272	struct net_device *dev = to_net_dev(d);
	273	struct net_device_stats *stats;
	274	ssize_t ret = -EINVAL;
	275
	276	WARN_ON(offset > sizeof(struct net_device_stats) \|\|
	277	offset % sizeof(unsigned long) != 0);
	278
	279	read_lock(&dev_base_lock);
	280	if (dev_isalive(dev)) {
	281	stats = dev->get_stats(dev);
	282	ret = sprintf(buf, fmt_ulong,
	283	(unsigned long )(((u8 *) stats) + offset));
	284	}
	285	read_unlock(&dev_base_lock);
	286	return ret;
	287	}
	288
	289	/* generate a read-only statistics attribute */
	290	#define NETSTAT_ENTRY(name) \
	291	static ssize_t show_##name(struct device *d, \
	292	struct device_attribute attr, char buf) \
	293	{ \
	294	return netstat_show(d, attr, buf, \
	295	offsetof(struct net_device_stats, name)); \
	296	} \
	297	static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
	298
	299	NETSTAT_ENTRY(rx_packets);
	300	NETSTAT_ENTRY(tx_packets);
	301	NETSTAT_ENTRY(rx_bytes);
	302	NETSTAT_ENTRY(tx_bytes);
	303	NETSTAT_ENTRY(rx_errors);
	304	NETSTAT_ENTRY(tx_errors);
	305	NETSTAT_ENTRY(rx_dropped);
	306	NETSTAT_ENTRY(tx_dropped);
	307	NETSTAT_ENTRY(multicast);
	308	NETSTAT_ENTRY(collisions);
	309	NETSTAT_ENTRY(rx_length_errors);
	310	NETSTAT_ENTRY(rx_over_errors);
	311	NETSTAT_ENTRY(rx_crc_errors);
	312	NETSTAT_ENTRY(rx_frame_errors);
	313	NETSTAT_ENTRY(rx_fifo_errors);
	314	NETSTAT_ENTRY(rx_missed_errors);
	315	NETSTAT_ENTRY(tx_aborted_errors);
	316	NETSTAT_ENTRY(tx_carrier_errors);
	317	NETSTAT_ENTRY(tx_fifo_errors);
	318	NETSTAT_ENTRY(tx_heartbeat_errors);
	319	NETSTAT_ENTRY(tx_window_errors);
	320	NETSTAT_ENTRY(rx_compressed);
	321	NETSTAT_ENTRY(tx_compressed);
	322
	323	static struct attribute *netstat_attrs[] = {
	324	&dev_attr_rx_packets.attr,
	325	&dev_attr_tx_packets.attr,
	326	&dev_attr_rx_bytes.attr,
	327	&dev_attr_tx_bytes.attr,
	328	&dev_attr_rx_errors.attr,
	329	&dev_attr_tx_errors.attr,
	330	&dev_attr_rx_dropped.attr,
	331	&dev_attr_tx_dropped.attr,
	332	&dev_attr_multicast.attr,
	333	&dev_attr_collisions.attr,
	334	&dev_attr_rx_length_errors.attr,
	335	&dev_attr_rx_over_errors.attr,
	336	&dev_attr_rx_crc_errors.attr,
	337	&dev_attr_rx_frame_errors.attr,
	338	&dev_attr_rx_fifo_errors.attr,
	339	&dev_attr_rx_missed_errors.attr,
	340	&dev_attr_tx_aborted_errors.attr,
	341	&dev_attr_tx_carrier_errors.attr,
	342	&dev_attr_tx_fifo_errors.attr,
	343	&dev_attr_tx_heartbeat_errors.attr,
	344	&dev_attr_tx_window_errors.attr,
	345	&dev_attr_rx_compressed.attr,
	346	&dev_attr_tx_compressed.attr,
	347	NULL
	348	};
	349
	350
	351	static struct attribute_group netstat_group = {
	352	.name = "statistics",
	353	.attrs = netstat_attrs,
	354	};
	355
	356	#ifdef CONFIG_WIRELESS_EXT_SYSFS
	357	/* helper function that does all the locking etc for wireless stats */
	358	static ssize_t wireless_show(struct device d, char buf,
	359	ssize_t (format)(const struct iw_statistics ,
	360	char *))
	361	{
	362	struct net_device *dev = to_net_dev(d);
	363	const struct iw_statistics *iw = NULL;
	364	ssize_t ret = -EINVAL;
	365
	366	read_lock(&dev_base_lock);
	367	if (dev_isalive(dev)) {
	368	if (dev->wireless_handlers &&
	369	dev->wireless_handlers->get_wireless_stats)
	370	iw = dev->wireless_handlers->get_wireless_stats(dev);
	371	if (iw != NULL)
	372	ret = (*format)(iw, buf);
	373	}
	374	read_unlock(&dev_base_lock);
	375
	376	return ret;
	377	}
	378
	379	/* show function template for wireless fields */
	380	#define WIRELESS_SHOW(name, field, format_string) \
	381	static ssize_t format_iw_##name(const struct iw_statistics iw, char buf) \
	382	{ \
	383	return sprintf(buf, format_string, iw->field); \
	384	} \
	385	static ssize_t show_iw_##name(struct device *d, \
	386	struct device_attribute attr, char buf) \
	387	{ \
	388	return wireless_show(d, buf, format_iw_##name); \
	389	} \
	390	static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
	391
	392	WIRELESS_SHOW(status, status, fmt_hex);
	393	WIRELESS_SHOW(link, qual.qual, fmt_dec);
	394	WIRELESS_SHOW(level, qual.level, fmt_dec);
	395	WIRELESS_SHOW(noise, qual.noise, fmt_dec);
	396	WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
	397	WIRELESS_SHOW(crypt, discard.code, fmt_dec);
	398	WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
	399	WIRELESS_SHOW(misc, discard.misc, fmt_dec);
	400	WIRELESS_SHOW(retries, discard.retries, fmt_dec);
	401	WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
	402
	403	static struct attribute *wireless_attrs[] = {
	404	&dev_attr_status.attr,
	405	&dev_attr_link.attr,
	406	&dev_attr_level.attr,
	407	&dev_attr_noise.attr,
	408	&dev_attr_nwid.attr,
	409	&dev_attr_crypt.attr,
	410	&dev_attr_fragment.attr,
	411	&dev_attr_retries.attr,
	412	&dev_attr_misc.attr,
	413	&dev_attr_beacon.attr,
	414	NULL
	415	};
	416
	417	static struct attribute_group wireless_group = {
	418	.name = "wireless",
	419	.attrs = wireless_attrs,
	420	};
	421	#endif
	422
	423	#endif /* CONFIG_SYSFS */
	424
	425	#ifdef CONFIG_HOTPLUG
	426	static int netdev_uevent(struct device d, struct kobj_uevent_env env)
	427	{
	428	struct net_device *dev = to_net_dev(d);
	429	int retval;
	430
	431	/* pass interface to uevent. */
	432	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
	433	if (retval)
	434	goto exit;
	435
	436	/* pass ifindex to uevent.
	437	* ifindex is useful as it won't change (interface name may change)
	438	* and is what RtNetlink uses natively. */
	439	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
	440
	441	exit:
	442	return retval;
	443	}
	444	#endif
	445
	446	/*
	447	* netdev_release -- destroy and free a dead device.
	448	* Called when last reference to device kobject is gone.
	449	*/
	450	static void netdev_release(struct device *d)
	451	{
	452	struct net_device *dev = to_net_dev(d);
	453
	454	BUG_ON(dev->reg_state != NETREG_RELEASED);
	455
	456	kfree(dev->ifalias);
	457	kfree((char *)dev - dev->padded);
	458	}
	459
	460	static struct class net_class = {
	461	.name = "net",
	462	.dev_release = netdev_release,
	463	#ifdef CONFIG_SYSFS
	464	.dev_attrs = net_class_attributes,
	465	#endif /* CONFIG_SYSFS */
	466	#ifdef CONFIG_HOTPLUG
	467	.dev_uevent = netdev_uevent,
	468	#endif
	469	};
	470
	471	/* Delete sysfs entries but hold kobject reference until after all
	472	* netdev references are gone.
	473	*/
	474	void netdev_unregister_kobject(struct net_device * net)
	475	{
	476	struct device *dev = &(net->dev);
	477
	478	kobject_get(&dev->kobj);
	479	device_del(dev);
	480	}
	481
	482	/* Create sysfs entries for network device. */
	483	int netdev_register_kobject(struct net_device *net)
	484	{
	485	struct device *dev = &(net->dev);
	486	struct attribute_group **groups = net->sysfs_groups;
	487
	488	dev->class = &net_class;
	489	dev->platform_data = net;
	490	dev->groups = groups;
	491
	492	BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);
	493	strlcpy(dev->bus_id, net->name, BUS_ID_SIZE);
	494
	495	#ifdef CONFIG_SYSFS
	496	*groups++ = &netstat_group;
	497
	498	#ifdef CONFIG_WIRELESS_EXT_SYSFS
	499	if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)
	500	*groups++ = &wireless_group;
	501	#endif
	502	#endif /* CONFIG_SYSFS */
	503
	504	return device_add(dev);
	505	}
	506
	507	int netdev_class_create_file(struct class_attribute *class_attr)
	508	{
	509	return class_create_file(&net_class, class_attr);
	510	}
	511
	512	void netdev_class_remove_file(struct class_attribute *class_attr)
	513	{
	514	class_remove_file(&net_class, class_attr);
	515	}
	516
	517	EXPORT_SYMBOL(netdev_class_create_file);
	518	EXPORT_SYMBOL(netdev_class_remove_file);
	519
	520	void netdev_initialize_kobject(struct net_device *net)
	521	{
	522	struct device *device = &(net->dev);
	523	device_initialize(device);
	524	}
	525
	526	int netdev_kobject_init(void)
	527	{
	528	return class_register(&net_class);
	529	}