[net-next-2.6.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/config.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>

#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
#define to_net_dev(class) container_of(class, struct net_device, class_dev)

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 class_device *cd, char *buf,
			   ssize_t (*format)(const struct net_device *, char *))
{
	struct net_device *net = to_net_dev(cd);
	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 class_device *cd, char *buf)		\
{									\
	return netdev_show(cd, buf, format_##field);			\
}


/* use same locking and permission rules as SIF* ioctl's */
static ssize_t netdev_store(struct class_device *dev,
			    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;
}

/* generate a read-only network device class attribute */
#define NETDEVICE_ATTR(field, format_string)				\
NETDEVICE_SHOW(field, format_string)					\
static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL)		\

NETDEVICE_ATTR(addr_len, fmt_dec);
NETDEVICE_ATTR(iflink, fmt_dec);
NETDEVICE_ATTR(ifindex, fmt_dec);
NETDEVICE_ATTR(features, fmt_long_hex);
NETDEVICE_ATTR(type, fmt_dec);

/* use same locking rules as GIFHWADDR ioctl's */
static ssize_t format_addr(char *buf, const unsigned char *addr, int len)
{
	int i;
	char *cp = buf;

	for (i = 0; i < len; i++)
		cp += sprintf(cp, "%02x%c", addr[i],
			      i == (len - 1) ? '\n' : ':');
	return cp - buf;
}

static ssize_t show_address(struct class_device *dev, char *buf)
{
	struct net_device *net = to_net_dev(dev);
	ssize_t ret = -EINVAL;

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

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

static ssize_t show_carrier(struct class_device *dev, 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 CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
static CLASS_DEVICE_ATTR(broadcast, S_IRUGO, show_broadcast, NULL);
static CLASS_DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL);

/* 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 class_device *dev, const char *buf, size_t len)
{
	return netdev_store(dev, buf, len, change_mtu);
}

static CLASS_DEVICE_ATTR(mtu, S_IRUGO | S_IWUSR, show_mtu, store_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 class_device *dev, const char *buf, size_t len)
{
	return netdev_store(dev, buf, len, change_flags);
}

static CLASS_DEVICE_ATTR(flags, S_IRUGO | S_IWUSR, show_flags, store_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 class_device *dev, const char *buf, size_t len)
{
	return netdev_store(dev, buf, len, change_tx_queue_len);
}

static CLASS_DEVICE_ATTR(tx_queue_len, S_IRUGO | S_IWUSR, show_tx_queue_len, 
			 store_tx_queue_len);

NETDEVICE_SHOW(weight, fmt_dec);

static int change_weight(struct net_device *net, unsigned long new_weight)
{
	net->weight = new_weight;
	return 0;
}

static ssize_t store_weight(struct class_device *dev, const char *buf, size_t len)
{
	return netdev_store(dev, buf, len, change_weight);
}

static CLASS_DEVICE_ATTR(weight, S_IRUGO | S_IWUSR, show_weight, 
			 store_weight);


static struct class_device_attribute *net_class_attributes[] = {
	&class_device_attr_ifindex,
	&class_device_attr_iflink,
	&class_device_attr_addr_len,
	&class_device_attr_tx_queue_len,
	&class_device_attr_features,
	&class_device_attr_mtu,
	&class_device_attr_flags,
	&class_device_attr_weight,
	&class_device_attr_type,
	&class_device_attr_address,
	&class_device_attr_broadcast,
	&class_device_attr_carrier,
	NULL
};

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

	if (offset > sizeof(struct net_device_stats) ||
	    offset % sizeof(unsigned long) != 0)
		WARN_ON(1);

	read_lock(&dev_base_lock);
	if (dev_isalive(dev) && dev->get_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 class_device *cd, char *buf) 		\
{									\
	return netstat_show(cd, buf, 					\
			    offsetof(struct net_device_stats, name));	\
}									\
static CLASS_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[] = {
	&class_device_attr_rx_packets.attr,
	&class_device_attr_tx_packets.attr,
	&class_device_attr_rx_bytes.attr,
	&class_device_attr_tx_bytes.attr,
	&class_device_attr_rx_errors.attr,
	&class_device_attr_tx_errors.attr,
	&class_device_attr_rx_dropped.attr,
	&class_device_attr_tx_dropped.attr,
	&class_device_attr_multicast.attr,
	&class_device_attr_collisions.attr,
	&class_device_attr_rx_length_errors.attr,
	&class_device_attr_rx_over_errors.attr,
	&class_device_attr_rx_crc_errors.attr,
	&class_device_attr_rx_frame_errors.attr,
	&class_device_attr_rx_fifo_errors.attr,
	&class_device_attr_rx_missed_errors.attr,
	&class_device_attr_tx_aborted_errors.attr,
	&class_device_attr_tx_carrier_errors.attr,
	&class_device_attr_tx_fifo_errors.attr,
	&class_device_attr_tx_heartbeat_errors.attr,
	&class_device_attr_tx_window_errors.attr,
	&class_device_attr_rx_compressed.attr,
	&class_device_attr_tx_compressed.attr,
	NULL
};


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

#ifdef WIRELESS_EXT
/* helper function that does all the locking etc for wireless stats */
static ssize_t wireless_show(struct class_device *cd, char *buf,
			     ssize_t (*format)(const struct iw_statistics *,
					       char *))
{
	struct net_device *dev = to_net_dev(cd);
	const struct iw_statistics *iw;
	ssize_t ret = -EINVAL;
	
	read_lock(&dev_base_lock);
	if (dev_isalive(dev) && dev->get_wireless_stats 
	    && (iw = dev->get_wireless_stats(dev)) != 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 class_device *cd, char *buf)	\
{									\
	return wireless_show(cd, buf, format_iw_##name);		\
}									\
static CLASS_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[] = {
	&class_device_attr_status.attr,
	&class_device_attr_link.attr,
	&class_device_attr_level.attr,
	&class_device_attr_noise.attr,
	&class_device_attr_nwid.attr,
	&class_device_attr_crypt.attr,
	&class_device_attr_fragment.attr,
	&class_device_attr_retries.attr,
	&class_device_attr_misc.attr,
	&class_device_attr_beacon.attr,
	NULL
};

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

#ifdef CONFIG_HOTPLUG
static int netdev_hotplug(struct class_device *cd, char **envp,
			  int num_envp, char *buf, int size)
{
	struct net_device *dev = to_net_dev(cd);
	int i = 0;
	int n;

	/* pass interface in env to hotplug. */
	envp[i++] = buf;
	n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
	buf += n;
	size -= n;

	if ((size <= 0) || (i >= num_envp))
		return -ENOMEM;

	envp[i] = NULL;
	return 0;
}
#endif

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

	BUG_ON(dev->reg_state != NETREG_RELEASED);

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

static struct class net_class = {
	.name = "net",
	.release = netdev_release,
#ifdef CONFIG_HOTPLUG
	.hotplug = netdev_hotplug,
#endif
};

void netdev_unregister_sysfs(struct net_device * net)
{
	struct class_device * class_dev = &(net->class_dev);

	if (net->get_stats)
		sysfs_remove_group(&class_dev->kobj, &netstat_group);

#ifdef WIRELESS_EXT
	if (net->get_wireless_stats)
		sysfs_remove_group(&class_dev->kobj, &wireless_group);
#endif
	class_device_del(class_dev);

}

/* Create sysfs entries for network device. */
int netdev_register_sysfs(struct net_device *net)
{
	struct class_device *class_dev = &(net->class_dev);
	int i;
	struct class_device_attribute *attr;
	int ret;

	class_dev->class = &net_class;
	class_dev->class_data = net;

	strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
	if ((ret = class_device_register(class_dev)))
		goto out;

	for (i = 0; (attr = net_class_attributes[i]) != NULL; i++) {
		if ((ret = class_device_create_file(class_dev, attr)))
		    goto out_unreg;
	}


	if (net->get_stats &&
	    (ret = sysfs_create_group(&class_dev->kobj, &netstat_group)))
		goto out_unreg; 

#ifdef WIRELESS_EXT
	if (net->get_wireless_stats &&
	    (ret = sysfs_create_group(&class_dev->kobj, &wireless_group)))
		goto out_cleanup; 

	return 0;
out_cleanup:
	if (net->get_stats)
		sysfs_remove_group(&class_dev->kobj, &netstat_group);
#else
	return 0;
#endif

out_unreg:
	printk(KERN_WARNING "%s: sysfs attribute registration failed %d\n",
	       net->name, ret);
	class_device_unregister(class_dev);
out:
	return ret;
}

int netdev_sysfs_init(void)
{
	return class_register(&net_class);
}
Commit	Line	Data
1da177e4 LT	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/config.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
	20	#define to_class_dev(obj) container_of(obj,struct class_device,kobj)
	21	#define to_net_dev(class) container_of(class, struct net_device, class_dev)
	22
	23	static const char fmt_hex[] = "%#x\n";
d1102b59	24	static const char fmt_long_hex[] = "%#lx\n";
1da177e4 LT	25	static const char fmt_dec[] = "%d\n";
	26	static const char fmt_ulong[] = "%lu\n";
	27
	28	static inline int dev_isalive(const struct net_device *dev)
	29	{
	30	return dev->reg_state == NETREG_REGISTERED;
	31	}
	32
	33	/* use same locking rules as GIF* ioctl's */
	34	static ssize_t netdev_show(const struct class_device cd, char buf,
	35	ssize_t (format)(const struct net_device , char *))
	36	{
	37	struct net_device *net = to_net_dev(cd);
	38	ssize_t ret = -EINVAL;
	39
	40	read_lock(&dev_base_lock);
	41	if (dev_isalive(net))
	42	ret = (*format)(net, buf);
	43	read_unlock(&dev_base_lock);
	44
	45	return ret;
	46	}
	47
	48	/* generate a show function for simple field */
	49	#define NETDEVICE_SHOW(field, format_string) \
	50	static ssize_t format_##field(const struct net_device net, char buf) \
	51	{ \
	52	return sprintf(buf, format_string, net->field); \
	53	} \
	54	static ssize_t show_##field(struct class_device cd, char buf) \
	55	{ \
	56	return netdev_show(cd, buf, format_##field); \
	57	}
	58
	59
	60	/* use same locking and permission rules as SIF* ioctl's */
	61	static ssize_t netdev_store(struct class_device *dev,
	62	const char *buf, size_t len,
	63	int (set)(struct net_device , unsigned long))
	64	{
	65	struct net_device *net = to_net_dev(dev);
	66	char *endp;
	67	unsigned long new;
	68	int ret = -EINVAL;
	69
	70	if (!capable(CAP_NET_ADMIN))
	71	return -EPERM;
	72
	73	new = simple_strtoul(buf, &endp, 0);
	74	if (endp == buf)
	75	goto err;
	76
	77	rtnl_lock();
	78	if (dev_isalive(net)) {
	79	if ((ret = (*set)(net, new)) == 0)
	80	ret = len;
	81	}
	82	rtnl_unlock();
	83	err:
	84	return ret;
	85	}
	86
	87	/* generate a read-only network device class attribute */
	88	#define NETDEVICE_ATTR(field, format_string) \
89	NETDEVICE_SHOW(field, format_string) \
90	static CLASS_DEVICE_ATTR(field, S_IRUGO, show_##field, NULL) \
91
92	NETDEVICE_ATTR(addr_len, fmt_dec);
93	NETDEVICE_ATTR(iflink, fmt_dec);
94	NETDEVICE_ATTR(ifindex, fmt_dec);
d1102b59	95	NETDEVICE_ATTR(features, fmt_long_hex);
1da177e4 LT	96	NETDEVICE_ATTR(type, fmt_dec);
	97
	98	/* use same locking rules as GIFHWADDR ioctl's */
	99	static ssize_t format_addr(char buf, const unsigned char addr, int len)
	100	{
	101	int i;
	102	char *cp = buf;
	103
	104	for (i = 0; i < len; i++)
	105	cp += sprintf(cp, "%02x%c", addr[i],
	106	i == (len - 1) ? '\n' : ':');
	107	return cp - buf;
	108	}
	109
	110	static ssize_t show_address(struct class_device dev, char buf)
	111	{
	112	struct net_device *net = to_net_dev(dev);
	113	ssize_t ret = -EINVAL;
	114
	115	read_lock(&dev_base_lock);
	116	if (dev_isalive(net))
	117	ret = format_addr(buf, net->dev_addr, net->addr_len);
	118	read_unlock(&dev_base_lock);
	119	return ret;
	120	}
	121
	122	static ssize_t show_broadcast(struct class_device dev, char buf)
	123	{
	124	struct net_device *net = to_net_dev(dev);
	125	if (dev_isalive(net))
	126	return format_addr(buf, net->broadcast, net->addr_len);
	127	return -EINVAL;
	128	}
	129
	130	static ssize_t show_carrier(struct class_device dev, char buf)
	131	{
	132	struct net_device *netdev = to_net_dev(dev);
	133	if (netif_running(netdev)) {
	134	return sprintf(buf, fmt_dec, !!netif_carrier_ok(netdev));
	135	}
	136	return -EINVAL;
	137	}
	138
	139	static CLASS_DEVICE_ATTR(address, S_IRUGO, show_address, NULL);
	140	static CLASS_DEVICE_ATTR(broadcast, S_IRUGO, show_broadcast, NULL);
	141	static CLASS_DEVICE_ATTR(carrier, S_IRUGO, show_carrier, NULL);
	142
	143	/* read-write attributes */
	144	NETDEVICE_SHOW(mtu, fmt_dec);
	145
	146	static int change_mtu(struct net_device *net, unsigned long new_mtu)
	147	{
	148	return dev_set_mtu(net, (int) new_mtu);
	149	}
	150
	151	static ssize_t store_mtu(struct class_device dev, const char buf, size_t len)
	152	{
	153	return netdev_store(dev, buf, len, change_mtu);
	154	}
	155
	156	static CLASS_DEVICE_ATTR(mtu, S_IRUGO \| S_IWUSR, show_mtu, store_mtu);
	157
	158	NETDEVICE_SHOW(flags, fmt_hex);
	159
160	static int change_flags(struct net_device *net, unsigned long new_flags)
161	{
162	return dev_change_flags(net, (unsigned) new_flags);
163	}
164
165	static ssize_t store_flags(struct class_device dev, const char buf, size_t len)
166	{
167	return netdev_store(dev, buf, len, change_flags);
168	}
169
170	static CLASS_DEVICE_ATTR(flags, S_IRUGO \| S_IWUSR, show_flags, store_flags);
171
172	NETDEVICE_SHOW(tx_queue_len, fmt_ulong);
173
174	static int change_tx_queue_len(struct net_device *net, unsigned long new_len)
175	{
176	net->tx_queue_len = new_len;
177	return 0;
178	}
179
180	static ssize_t store_tx_queue_len(struct class_device dev, const char buf, size_t len)
181	{
182	return netdev_store(dev, buf, len, change_tx_queue_len);
183	}
184
185	static CLASS_DEVICE_ATTR(tx_queue_len, S_IRUGO \| S_IWUSR, show_tx_queue_len,
186	store_tx_queue_len);
187
699a4114 SH	188	NETDEVICE_SHOW(weight, fmt_dec);
	189
	190	static int change_weight(struct net_device *net, unsigned long new_weight)
	191	{
	192	net->weight = new_weight;
	193	return 0;
	194	}
	195
	196	static ssize_t store_weight(struct class_device dev, const char buf, size_t len)
	197	{
	198	return netdev_store(dev, buf, len, change_weight);
	199	}
	200
	201	static CLASS_DEVICE_ATTR(weight, S_IRUGO \| S_IWUSR, show_weight,
	202	store_weight);
	203
1da177e4 LT	204
	205	static struct class_device_attribute *net_class_attributes[] = {
	206	&class_device_attr_ifindex,
	207	&class_device_attr_iflink,
	208	&class_device_attr_addr_len,
	209	&class_device_attr_tx_queue_len,
	210	&class_device_attr_features,
	211	&class_device_attr_mtu,
	212	&class_device_attr_flags,
699a4114	213	&class_device_attr_weight,
1da177e4 LT	214	&class_device_attr_type,
	215	&class_device_attr_address,
	216	&class_device_attr_broadcast,
	217	&class_device_attr_carrier,
	218	NULL
	219	};
	220
	221	/* Show a given an attribute in the statistics group */
	222	static ssize_t netstat_show(const struct class_device cd, char buf,
	223	unsigned long offset)
	224	{
	225	struct net_device *dev = to_net_dev(cd);
	226	struct net_device_stats *stats;
	227	ssize_t ret = -EINVAL;
	228
	229	if (offset > sizeof(struct net_device_stats) \|\|
	230	offset % sizeof(unsigned long) != 0)
	231	WARN_ON(1);
	232
	233	read_lock(&dev_base_lock);
	234	if (dev_isalive(dev) && dev->get_stats &&
	235	(stats = (*dev->get_stats)(dev)))
	236	ret = sprintf(buf, fmt_ulong,
	237	(unsigned long )(((u8 *) stats) + offset));
	238
	239	read_unlock(&dev_base_lock);
	240	return ret;
	241	}
	242
	243	/* generate a read-only statistics attribute */
	244	#define NETSTAT_ENTRY(name) \
	245	static ssize_t show_##name(struct class_device cd, char buf) \
	246	{ \
	247	return netstat_show(cd, buf, \
	248	offsetof(struct net_device_stats, name)); \
	249	} \
	250	static CLASS_DEVICE_ATTR(name, S_IRUGO, show_##name, NULL)
	251
	252	NETSTAT_ENTRY(rx_packets);
	253	NETSTAT_ENTRY(tx_packets);
	254	NETSTAT_ENTRY(rx_bytes);
	255	NETSTAT_ENTRY(tx_bytes);
	256	NETSTAT_ENTRY(rx_errors);
	257	NETSTAT_ENTRY(tx_errors);
	258	NETSTAT_ENTRY(rx_dropped);
	259	NETSTAT_ENTRY(tx_dropped);
	260	NETSTAT_ENTRY(multicast);
	261	NETSTAT_ENTRY(collisions);
	262	NETSTAT_ENTRY(rx_length_errors);
	263	NETSTAT_ENTRY(rx_over_errors);
	264	NETSTAT_ENTRY(rx_crc_errors);
	265	NETSTAT_ENTRY(rx_frame_errors);
	266	NETSTAT_ENTRY(rx_fifo_errors);
	267	NETSTAT_ENTRY(rx_missed_errors);
	268	NETSTAT_ENTRY(tx_aborted_errors);
	269	NETSTAT_ENTRY(tx_carrier_errors);
	270	NETSTAT_ENTRY(tx_fifo_errors);
	271	NETSTAT_ENTRY(tx_heartbeat_errors);
	272	NETSTAT_ENTRY(tx_window_errors);
	273	NETSTAT_ENTRY(rx_compressed);
	274	NETSTAT_ENTRY(tx_compressed);
	275
	276	static struct attribute *netstat_attrs[] = {
	277	&class_device_attr_rx_packets.attr,
278	&class_device_attr_tx_packets.attr,
279	&class_device_attr_rx_bytes.attr,
280	&class_device_attr_tx_bytes.attr,
281	&class_device_attr_rx_errors.attr,
282	&class_device_attr_tx_errors.attr,
283	&class_device_attr_rx_dropped.attr,
284	&class_device_attr_tx_dropped.attr,
285	&class_device_attr_multicast.attr,
286	&class_device_attr_collisions.attr,
287	&class_device_attr_rx_length_errors.attr,
288	&class_device_attr_rx_over_errors.attr,
289	&class_device_attr_rx_crc_errors.attr,
290	&class_device_attr_rx_frame_errors.attr,
291	&class_device_attr_rx_fifo_errors.attr,
292	&class_device_attr_rx_missed_errors.attr,
293	&class_device_attr_tx_aborted_errors.attr,
294	&class_device_attr_tx_carrier_errors.attr,
295	&class_device_attr_tx_fifo_errors.attr,
296	&class_device_attr_tx_heartbeat_errors.attr,
297	&class_device_attr_tx_window_errors.attr,
298	&class_device_attr_rx_compressed.attr,
299	&class_device_attr_tx_compressed.attr,
300	NULL
301	};
302
303
304	static struct attribute_group netstat_group = {
305	.name = "statistics",
306	.attrs = netstat_attrs,
307	};
308
309	#ifdef WIRELESS_EXT
310	/* helper function that does all the locking etc for wireless stats */
311	static ssize_t wireless_show(struct class_device cd, char buf,
312	ssize_t (format)(const struct iw_statistics ,
313	char *))
314	{
315	struct net_device *dev = to_net_dev(cd);
316	const struct iw_statistics *iw;
317	ssize_t ret = -EINVAL;
318
319	read_lock(&dev_base_lock);
320	if (dev_isalive(dev) && dev->get_wireless_stats
321	&& (iw = dev->get_wireless_stats(dev)) != NULL)
322	ret = (*format)(iw, buf);
323	read_unlock(&dev_base_lock);
324
325	return ret;
326	}
327
328	/* show function template for wireless fields */
329	#define WIRELESS_SHOW(name, field, format_string) \
330	static ssize_t format_iw_##name(const struct iw_statistics iw, char buf) \
331	{ \
332	return sprintf(buf, format_string, iw->field); \
333	} \
334	static ssize_t show_iw_##name(struct class_device cd, char buf) \
335	{ \
336	return wireless_show(cd, buf, format_iw_##name); \
337	} \
338	static CLASS_DEVICE_ATTR(name, S_IRUGO, show_iw_##name, NULL)
339
340	WIRELESS_SHOW(status, status, fmt_hex);
341	WIRELESS_SHOW(link, qual.qual, fmt_dec);
342	WIRELESS_SHOW(level, qual.level, fmt_dec);
343	WIRELESS_SHOW(noise, qual.noise, fmt_dec);
344	WIRELESS_SHOW(nwid, discard.nwid, fmt_dec);
345	WIRELESS_SHOW(crypt, discard.code, fmt_dec);
346	WIRELESS_SHOW(fragment, discard.fragment, fmt_dec);
347	WIRELESS_SHOW(misc, discard.misc, fmt_dec);
348	WIRELESS_SHOW(retries, discard.retries, fmt_dec);
349	WIRELESS_SHOW(beacon, miss.beacon, fmt_dec);
350
351	static struct attribute *wireless_attrs[] = {
352	&class_device_attr_status.attr,
353	&class_device_attr_link.attr,
354	&class_device_attr_level.attr,
355	&class_device_attr_noise.attr,
356	&class_device_attr_nwid.attr,
357	&class_device_attr_crypt.attr,
358	&class_device_attr_fragment.attr,
359	&class_device_attr_retries.attr,
360	&class_device_attr_misc.attr,
361	&class_device_attr_beacon.attr,
362	NULL
363	};
364
365	static struct attribute_group wireless_group = {
366	.name = "wireless",
367	.attrs = wireless_attrs,
368	};
369	#endif
370
371	#ifdef CONFIG_HOTPLUG
372	static int netdev_hotplug(struct class_device cd, char *envp,
373	int num_envp, char *buf, int size)
374	{
375	struct net_device *dev = to_net_dev(cd);
376	int i = 0;
377	int n;
378
379	/* pass interface in env to hotplug. */
380	envp[i++] = buf;
381	n = snprintf(buf, size, "INTERFACE=%s", dev->name) + 1;
382	buf += n;
383	size -= n;
384
385	if ((size <= 0) \|\| (i >= num_envp))
386	return -ENOMEM;
387
388	envp[i] = NULL;
389	return 0;
390	}
391	#endif
392
393	/*
394	* netdev_release -- destroy and free a dead device.
395	* Called when last reference to class_device kobject is gone.
396	*/
397	static void netdev_release(struct class_device *cd)
398	{
399	struct net_device *dev
400	= container_of(cd, struct net_device, class_dev);
401
402	BUG_ON(dev->reg_state != NETREG_RELEASED);
403
404	kfree((char *)dev - dev->padded);
405	}
406
407	static struct class net_class = {
408	.name = "net",
409	.release = netdev_release,
410	#ifdef CONFIG_HOTPLUG
411	.hotplug = netdev_hotplug,
412	#endif
413	};
414
415	void netdev_unregister_sysfs(struct net_device * net)
416	{
417	struct class_device * class_dev = &(net->class_dev);
418
419	if (net->get_stats)
420	sysfs_remove_group(&class_dev->kobj, &netstat_group);
421
422	#ifdef WIRELESS_EXT
423	if (net->get_wireless_stats)
424	sysfs_remove_group(&class_dev->kobj, &wireless_group);
425	#endif
426	class_device_del(class_dev);
427
428	}
429
430	/* Create sysfs entries for network device. */
431	int netdev_register_sysfs(struct net_device *net)
432	{
433	struct class_device *class_dev = &(net->class_dev);
434	int i;
435	struct class_device_attribute *attr;
436	int ret;
437
438	class_dev->class = &net_class;
439	class_dev->class_data = net;
440
441	strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE);
442	if ((ret = class_device_register(class_dev)))
443	goto out;
444
445	for (i = 0; (attr = net_class_attributes[i]) != NULL; i++) {
446	if ((ret = class_device_create_file(class_dev, attr)))
447	goto out_unreg;
448	}
449
450
451	if (net->get_stats &&
452	(ret = sysfs_create_group(&class_dev->kobj, &netstat_group)))
453	goto out_unreg;
454
455	#ifdef WIRELESS_EXT
456	if (net->get_wireless_stats &&
457	(ret = sysfs_create_group(&class_dev->kobj, &wireless_group)))
458	goto out_cleanup;
459
460	return 0;
461	out_cleanup:
462	if (net->get_stats)
463	sysfs_remove_group(&class_dev->kobj, &netstat_group);
464	#else
465	return 0;
466	#endif
467
468	out_unreg:
469	printk(KERN_WARNING "%s: sysfs attribute registration failed %d\n",
470	net->name, ret);
471	class_device_unregister(class_dev);
472	out:
473	return ret;
474	}
475
476	int netdev_sysfs_init(void)
477	{
478	return class_register(&net_class);
479	}