[linux-block.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;

	if (!rtnl_trylock())
		return restart_syscall();

	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 *const 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;

	if (!rtnl_trylock())
		return restart_syscall();
	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;

	if (!rtnl_trylock())
		return restart_syscall();
	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);
	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)) {
		const struct net_device_stats *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;

	if (!net_eq(dev_net(dev), &init_net))
		return 0;

	/* 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);

	if (dev_net(net) != &init_net)
		return;

	device_del(dev);
}

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

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

	dev_set_name(dev, "%s", net->name);

#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 */

	if (dev_net(net) != &init_net)
		return 0;

	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	if (!rtnl_trylock())
	81	return restart_syscall();
	82
	83	if (dev_isalive(net)) {
	84	if ((ret = (*set)(net, new)) == 0)
	85	ret = len;
	86	}
	87	rtnl_unlock();
	88	err:
	89	return ret;
	90	}
	91
	92	NETDEVICE_SHOW(dev_id, fmt_hex);
	93	NETDEVICE_SHOW(addr_len, fmt_dec);
	94	NETDEVICE_SHOW(iflink, fmt_dec);
	95	NETDEVICE_SHOW(ifindex, fmt_dec);
	96	NETDEVICE_SHOW(features, fmt_long_hex);
	97	NETDEVICE_SHOW(type, fmt_dec);
	98	NETDEVICE_SHOW(link_mode, fmt_dec);
	99
	100	/* use same locking rules as GIFHWADDR ioctl's */
	101	static ssize_t show_address(struct device dev, struct device_attribute attr,
	102	char *buf)
	103	{
	104	struct net_device *net = to_net_dev(dev);
	105	ssize_t ret = -EINVAL;
	106
	107	read_lock(&dev_base_lock);
	108	if (dev_isalive(net))
	109	ret = sysfs_format_mac(buf, net->dev_addr, net->addr_len);
	110	read_unlock(&dev_base_lock);
	111	return ret;
	112	}
	113
	114	static ssize_t show_broadcast(struct device *dev,
	115	struct device_attribute attr, char buf)
	116	{
	117	struct net_device *net = to_net_dev(dev);
	118	if (dev_isalive(net))
	119	return sysfs_format_mac(buf, net->broadcast, net->addr_len);
	120	return -EINVAL;
	121	}
	122
	123	static ssize_t show_carrier(struct device *dev,
	124	struct device_attribute attr, char buf)
	125	{
	126	struct net_device *netdev = to_net_dev(dev);
	127	if (netif_running(netdev)) {
	128	return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
	129	}
	130	return -EINVAL;
	131	}
	132
	133	static ssize_t show_dormant(struct device *dev,
	134	struct device_attribute attr, char buf)
	135	{
	136	struct net_device *netdev = to_net_dev(dev);
	137
	138	if (netif_running(netdev))
	139	return sprintf(buf, fmt_dec, !!netif_dormant(netdev));
	140
	141	return -EINVAL;
	142	}
	143
	144	static const char *const operstates[] = {
	145	"unknown",
	146	"notpresent", /* currently unused */
	147	"down",
	148	"lowerlayerdown",
	149	"testing", /* currently unused */
	150	"dormant",
	151	"up"
	152	};
	153
	154	static ssize_t show_operstate(struct device *dev,
	155	struct device_attribute attr, char buf)
	156	{
	157	const struct net_device *netdev = to_net_dev(dev);
	158	unsigned char operstate;
	159
	160	read_lock(&dev_base_lock);
	161	operstate = netdev->operstate;
	162	if (!netif_running(netdev))
	163	operstate = IF_OPER_DOWN;
	164	read_unlock(&dev_base_lock);
	165
	166	if (operstate >= ARRAY_SIZE(operstates))
	167	return -EINVAL; /* should not happen */
	168
	169	return sprintf(buf, "%s\n", operstates[operstate]);
	170	}
	171
	172	/* read-write attributes */
	173	NETDEVICE_SHOW(mtu, fmt_dec);
	174
	175	static int change_mtu(struct net_device *net, unsigned long new_mtu)
	176	{
	177	return dev_set_mtu(net, (int) new_mtu);
	178	}
	179
	180	static ssize_t store_mtu(struct device dev, struct device_attribute attr,
	181	const char *buf, size_t len)
	182	{
	183	return netdev_store(dev, attr, buf, len, change_mtu);
	184	}
	185
	186	NETDEVICE_SHOW(flags, fmt_hex);
	187
	188	static int change_flags(struct net_device *net, unsigned long new_flags)
	189	{
	190	return dev_change_flags(net, (unsigned) new_flags);
	191	}
	192
	193	static ssize_t store_flags(struct device dev, struct device_attribute attr,
	194	const char *buf, size_t len)
	195	{
	196	return netdev_store(dev, attr, buf, len, change_flags);
	197	}
	198
	199	NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
	200
	201	static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
	202	{
	203	net->tx_queue_len = new_len;
	204	return 0;
	205	}
	206
	207	static ssize_t store_tx_queue_len(struct device *dev,
	208	struct device_attribute *attr,
	209	const char *buf, size_t len)
	210	{
	211	return netdev_store(dev, attr, buf, len, change_tx_queue_len);
	212	}
	213
	214	static ssize_t store_ifalias(struct device dev, struct device_attribute attr,
	215	const char *buf, size_t len)
	216	{
	217	struct net_device *netdev = to_net_dev(dev);
	218	size_t count = len;
	219	ssize_t ret;
	220
	221	if (!capable(CAP_NET_ADMIN))
	222	return -EPERM;
	223
	224	/* ignore trailing newline */
	225	if (len > 0 && buf[len - 1] == '\n')
	226	--count;
	227
	228	if (!rtnl_trylock())
	229	return restart_syscall();
	230	ret = dev_set_alias(netdev, buf, count);
	231	rtnl_unlock();
	232
	233	return ret < 0 ? ret : len;
	234	}
	235
	236	static ssize_t show_ifalias(struct device *dev,
	237	struct device_attribute attr, char buf)
	238	{
	239	const struct net_device *netdev = to_net_dev(dev);
	240	ssize_t ret = 0;
	241
	242	if (!rtnl_trylock())
	243	return restart_syscall();
	244	if (netdev->ifalias)
	245	ret = sprintf(buf, "%s\n", netdev->ifalias);
	246	rtnl_unlock();
	247	return ret;
	248	}
	249
	250	static struct device_attribute net_class_attributes[] = {
	251	__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),
	252	__ATTR(dev_id, S_IRUGO, show_dev_id, NULL),
	253	__ATTR(ifalias, S_IRUGO \| S_IWUSR, show_ifalias, store_ifalias),
	254	__ATTR(iflink, S_IRUGO, show_iflink, NULL),
	255	__ATTR(ifindex, S_IRUGO, show_ifindex, NULL),
	256	__ATTR(features, S_IRUGO, show_features, NULL),
	257	__ATTR(type, S_IRUGO, show_type, NULL),
	258	__ATTR(link_mode, S_IRUGO, show_link_mode, NULL),
	259	__ATTR(address, S_IRUGO, show_address, NULL),
	260	__ATTR(broadcast, S_IRUGO, show_broadcast, NULL),
	261	__ATTR(carrier, S_IRUGO, show_carrier, NULL),
	262	__ATTR(dormant, S_IRUGO, show_dormant, NULL),
	263	__ATTR(operstate, S_IRUGO, show_operstate, NULL),
	264	__ATTR(mtu, S_IRUGO \| S_IWUSR, show_mtu, store_mtu),
	265	__ATTR(flags, S_IRUGO \| S_IWUSR, show_flags, store_flags),
	266	__ATTR(tx_queue_len, S_IRUGO \| S_IWUSR, show_tx_queue_len,
	267	store_tx_queue_len),
	268	{}
	269	};
	270
	271	/* Show a given an attribute in the statistics group */
	272	static ssize_t netstat_show(const struct device *d,
	273	struct device_attribute attr, char buf,
	274	unsigned long offset)
	275	{
	276	struct net_device *dev = to_net_dev(d);
	277	ssize_t ret = -EINVAL;
	278
	279	WARN_ON(offset > sizeof(struct net_device_stats) \|\|
	280	offset % sizeof(unsigned long) != 0);
	281
	282	read_lock(&dev_base_lock);
	283	if (dev_isalive(dev)) {
	284	const struct net_device_stats *stats = dev_get_stats(dev);
	285	ret = sprintf(buf, fmt_ulong,
	286	(unsigned long )(((u8 *) stats) + offset));
	287	}
	288	read_unlock(&dev_base_lock);
	289	return ret;
	290	}
	291
	292	/* generate a read-only statistics attribute */
	293	#define NETSTAT_ENTRY(name) \
	294	static ssize_t show_##name(struct device *d, \
	295	struct device_attribute attr, char buf) \
	296	{ \
	297	return netstat_show(d, attr, buf, \
	298	offsetof(struct net_device_stats, name)); \
	299	} \
	300	static DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
	301
	302	NETSTAT_ENTRY(rx_packets);
	303	NETSTAT_ENTRY(tx_packets);
	304	NETSTAT_ENTRY(rx_bytes);
	305	NETSTAT_ENTRY(tx_bytes);
	306	NETSTAT_ENTRY(rx_errors);
	307	NETSTAT_ENTRY(tx_errors);
	308	NETSTAT_ENTRY(rx_dropped);
	309	NETSTAT_ENTRY(tx_dropped);
	310	NETSTAT_ENTRY(multicast);
	311	NETSTAT_ENTRY(collisions);
	312	NETSTAT_ENTRY(rx_length_errors);
	313	NETSTAT_ENTRY(rx_over_errors);
	314	NETSTAT_ENTRY(rx_crc_errors);
	315	NETSTAT_ENTRY(rx_frame_errors);
	316	NETSTAT_ENTRY(rx_fifo_errors);
	317	NETSTAT_ENTRY(rx_missed_errors);
	318	NETSTAT_ENTRY(tx_aborted_errors);
	319	NETSTAT_ENTRY(tx_carrier_errors);
	320	NETSTAT_ENTRY(tx_fifo_errors);
	321	NETSTAT_ENTRY(tx_heartbeat_errors);
	322	NETSTAT_ENTRY(tx_window_errors);
	323	NETSTAT_ENTRY(rx_compressed);
	324	NETSTAT_ENTRY(tx_compressed);
	325
	326	static struct attribute *netstat_attrs[] = {
	327	&dev_attr_rx_packets.attr,
	328	&dev_attr_tx_packets.attr,
	329	&dev_attr_rx_bytes.attr,
	330	&dev_attr_tx_bytes.attr,
	331	&dev_attr_rx_errors.attr,
	332	&dev_attr_tx_errors.attr,
	333	&dev_attr_rx_dropped.attr,
	334	&dev_attr_tx_dropped.attr,
	335	&dev_attr_multicast.attr,
	336	&dev_attr_collisions.attr,
	337	&dev_attr_rx_length_errors.attr,
	338	&dev_attr_rx_over_errors.attr,
	339	&dev_attr_rx_crc_errors.attr,
	340	&dev_attr_rx_frame_errors.attr,
	341	&dev_attr_rx_fifo_errors.attr,
	342	&dev_attr_rx_missed_errors.attr,
	343	&dev_attr_tx_aborted_errors.attr,
	344	&dev_attr_tx_carrier_errors.attr,
	345	&dev_attr_tx_fifo_errors.attr,
	346	&dev_attr_tx_heartbeat_errors.attr,
	347	&dev_attr_tx_window_errors.attr,
	348	&dev_attr_rx_compressed.attr,
	349	&dev_attr_tx_compressed.attr,
	350	NULL
	351	};
	352
	353
	354	static struct attribute_group netstat_group = {
	355	.name = "statistics",
	356	.attrs = netstat_attrs,
	357	};
	358
	359	#ifdef CONFIG_WIRELESS_EXT_SYSFS
	360	/* helper function that does all the locking etc for wireless stats */
	361	static ssize_t wireless_show(struct device d, char buf,
	362	ssize_t (format)(const struct iw_statistics ,
	363	char *))
	364	{
	365	struct net_device *dev = to_net_dev(d);
	366	const struct iw_statistics *iw = NULL;
	367	ssize_t ret = -EINVAL;
	368
	369	read_lock(&dev_base_lock);
	370	if (dev_isalive(dev)) {
	371	if (dev->wireless_handlers &&
	372	dev->wireless_handlers->get_wireless_stats)
	373	iw = dev->wireless_handlers->get_wireless_stats(dev);
	374	if (iw != NULL)
	375	ret = (*format)(iw, buf);
	376	}
	377	read_unlock(&dev_base_lock);
	378
	379	return ret;
	380	}
	381
	382	/* show function template for wireless fields */
	383	#define WIRELESS_SHOW(name, field, format_string) \
	384	static ssize_t format_iw_##name(const struct iw_statistics iw, char buf) \
	385	{ \
	386	return sprintf(buf, format_string, iw->field); \
	387	} \
	388	static ssize_t show_iw_##name(struct device *d, \
	389	struct device_attribute attr, char buf) \
	390	{ \
	391	return wireless_show(d, buf, format_iw_##name); \
	392	} \
	393	static DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
	394
	395	WIRELESS_SHOW(status, status, fmt_hex);
	396	WIRELESS_SHOW(link, qual.qual, fmt_dec);
	397	WIRELESS_SHOW(level, qual.level, fmt_dec);
	398	WIRELESS_SHOW(noise, qual.noise, fmt_dec);
	399	WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
	400	WIRELESS_SHOW(crypt, discard.code, fmt_dec);
	401	WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
	402	WIRELESS_SHOW(misc, discard.misc, fmt_dec);
	403	WIRELESS_SHOW(retries, discard.retries, fmt_dec);
	404	WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
	405
	406	static struct attribute *wireless_attrs[] = {
	407	&dev_attr_status.attr,
	408	&dev_attr_link.attr,
	409	&dev_attr_level.attr,
	410	&dev_attr_noise.attr,
	411	&dev_attr_nwid.attr,
	412	&dev_attr_crypt.attr,
	413	&dev_attr_fragment.attr,
	414	&dev_attr_retries.attr,
	415	&dev_attr_misc.attr,
	416	&dev_attr_beacon.attr,
	417	NULL
	418	};
	419
	420	static struct attribute_group wireless_group = {
	421	.name = "wireless",
	422	.attrs = wireless_attrs,
	423	};
	424	#endif
	425
	426	#endif /* CONFIG_SYSFS */
	427
	428	#ifdef CONFIG_HOTPLUG
	429	static int netdev_uevent(struct device d, struct kobj_uevent_env env)
	430	{
	431	struct net_device *dev = to_net_dev(d);
	432	int retval;
	433
	434	if (!net_eq(dev_net(dev), &init_net))
	435	return 0;
	436
	437	/* pass interface to uevent. */
	438	retval = add_uevent_var(env, "INTERFACE=%s", dev->name);
	439	if (retval)
	440	goto exit;
	441
	442	/* pass ifindex to uevent.
	443	* ifindex is useful as it won't change (interface name may change)
	444	* and is what RtNetlink uses natively. */
	445	retval = add_uevent_var(env, "IFINDEX=%d", dev->ifindex);
	446
	447	exit:
	448	return retval;
	449	}
	450	#endif
	451
	452	/*
	453	* netdev_release -- destroy and free a dead device.
	454	* Called when last reference to device kobject is gone.
	455	*/
	456	static void netdev_release(struct device *d)
	457	{
	458	struct net_device *dev = to_net_dev(d);
	459
	460	BUG_ON(dev->reg_state != NETREG_RELEASED);
	461
	462	kfree(dev->ifalias);
	463	kfree((char *)dev - dev->padded);
	464	}
	465
	466	static struct class net_class = {
	467	.name = "net",
	468	.dev_release = netdev_release,
	469	#ifdef CONFIG_SYSFS
	470	.dev_attrs = net_class_attributes,
	471	#endif /* CONFIG_SYSFS */
	472	#ifdef CONFIG_HOTPLUG
	473	.dev_uevent = netdev_uevent,
	474	#endif
	475	};
	476
	477	/* Delete sysfs entries but hold kobject reference until after all
	478	* netdev references are gone.
	479	*/
	480	void netdev_unregister_kobject(struct net_device * net)
	481	{
	482	struct device *dev = &(net->dev);
	483
	484	kobject_get(&dev->kobj);
	485
	486	if (dev_net(net) != &init_net)
	487	return;
	488
	489	device_del(dev);
	490	}
	491
	492	/* Create sysfs entries for network device. */
	493	int netdev_register_kobject(struct net_device *net)
	494	{
	495	struct device *dev = &(net->dev);
	496	const struct attribute_group **groups = net->sysfs_groups;
	497
	498	dev->class = &net_class;
	499	dev->platform_data = net;
	500	dev->groups = groups;
	501
	502	dev_set_name(dev, "%s", net->name);
	503
	504	#ifdef CONFIG_SYSFS
	505	*groups++ = &netstat_group;
	506
	507	#ifdef CONFIG_WIRELESS_EXT_SYSFS
	508	if (net->wireless_handlers && net->wireless_handlers->get_wireless_stats)
	509	*groups++ = &wireless_group;
	510	#endif
	511	#endif /* CONFIG_SYSFS */
	512
	513	if (dev_net(net) != &init_net)
	514	return 0;
	515
	516	return device_add(dev);
	517	}
	518
	519	int netdev_class_create_file(struct class_attribute *class_attr)
	520	{
	521	return class_create_file(&net_class, class_attr);
	522	}
	523
	524	void netdev_class_remove_file(struct class_attribute *class_attr)
	525	{
	526	class_remove_file(&net_class, class_attr);
	527	}
	528
	529	EXPORT_SYMBOL(netdev_class_create_file);
	530	EXPORT_SYMBOL(netdev_class_remove_file);
	531
	532	void netdev_initialize_kobject(struct net_device *net)
	533	{
	534	struct device *device = &(net->dev);
	535	device_initialize(device);
	536	}
	537
	538	int netdev_kobject_init(void)
	539	{
	540	return class_register(&net_class);
	541	}