/* * 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/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>#include <net/iw_handler.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;} 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 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 ssize_t show_dormant(struct class_device *dev, 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 class_device *dev, 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 class_device *dev, const char *buf, size_t len){	return netdev_store(dev, 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 class_device *dev, const char *buf, size_t len){	return netdev_store(dev, 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 class_device *dev, const char *buf, size_t len){	return netdev_store(dev, buf, len, change_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 struct class_device_attribute net_class_attributes[] = {	__ATTR(addr_len, S_IRUGO, show_addr_len, NULL),	__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),	__ATTR(weight, S_IRUGO | S_IWUSR, show_weight, store_weight),	{}}; /* 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 = 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);		else if (dev->get_wireless_stats)			iw = dev->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 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_HOTPLUGstatic int netdev_uevent(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 to uevent. */	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,	.class_dev_attrs = net_class_attributes,#ifdef CONFIG_HOTPLUG	.uevent = netdev_uevent,#endif}; void netdev_unregister_sysfs(struct net_device * net){	class_device_del(&(net->class_dev));} /* Create sysfs entries for network device. */int netdev_register_sysfs(struct net_device *net){	struct class_device *class_dev = &(net->class_dev);	struct attribute_group **groups = net->sysfs_groups; 	class_device_initialize(class_dev);	class_dev->class = &net_class;	class_dev->class_data = net;	class_dev->groups = groups; 	BUILD_BUG_ON(BUS_ID_SIZE < IFNAMSIZ);	strlcpy(class_dev->class_id, net->name, BUS_ID_SIZE); 	if (net->get_stats)		*groups++ = &netstat_group; #ifdef WIRELESS_EXT	if (net->get_wireless_stats	    || (net->wireless_handlers && net->wireless_handlers->get_wireless_stats))		*groups++ = &wireless_group;#endif 	return class_device_add(class_dev);} int netdev_sysfs_init(void){	return class_register(&net_class);}