net/bridge/br_sysfs_br.c - kernel/msm-4.9 - Gitiles

 /*
  *	Sysfs attributes of bridge ports
  *	Linux ethernet bridge
  *
  *	Authors:
  *	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_bridge.h>
 #include <linux/rtnetlink.h>
 #include <linux/spinlock.h>
 #include <linux/times.h>

 #include "br_private.h"

 #define to_dev(obj)	container_of(obj, struct device, kobj)
 #define to_bridge(cd)	((struct net_bridge *)netdev_priv(to_net_dev(cd)))

 /*
  * Common code for storing bridge parameters.
  */
 static ssize_t store_bridge_parm(struct device *d,
 				 const char *buf, size_t len,
 				 int (*set)(struct net_bridge *, unsigned long))
 {
 	struct net_bridge *br = to_bridge(d);
 	char *endp;
 	unsigned long val;
 	int err;

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

 	val = simple_strtoul(buf, &endp, 0);
 	if (endp == buf)
 		return -EINVAL;

 	spin_lock_bh(&br->lock);
 	err = (*set)(br, val);
 	spin_unlock_bh(&br->lock);
 	return err ? err : len;
 }


 static ssize_t show_forward_delay(struct device *d,
 				  struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
 }

 static int set_forward_delay(struct net_bridge *br, unsigned long val)
 {
 	unsigned long delay = clock_t_to_jiffies(val);
 	br->forward_delay = delay;
 	if (br_is_root_bridge(br))
 		br->bridge_forward_delay = delay;
 	return 0;
 }

 static ssize_t store_forward_delay(struct device *d,
 				   struct device_attribute *attr,
 				   const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_forward_delay);
 }
 static DEVICE_ATTR(forward_delay, S_IRUGO | S_IWUSR,
 		   show_forward_delay, store_forward_delay);

 static ssize_t show_hello_time(struct device *d, struct device_attribute *attr,
 			       char *buf)
 {
 	return sprintf(buf, "%lu\n",
 		       jiffies_to_clock_t(to_bridge(d)->hello_time));
 }

 static int set_hello_time(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);

 	if (t < HZ)
 		return -EINVAL;

 	br->hello_time = t;
 	if (br_is_root_bridge(br))
 		br->bridge_hello_time = t;
 	return 0;
 }

 static ssize_t store_hello_time(struct device *d,
 				struct device_attribute *attr, const char *buf,
 				size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_hello_time);
 }
 static DEVICE_ATTR(hello_time, S_IRUGO | S_IWUSR, show_hello_time,
 		   store_hello_time);

 static ssize_t show_max_age(struct device *d, struct device_attribute *attr,
 			    char *buf)
 {
 	return sprintf(buf, "%lu\n",
 		       jiffies_to_clock_t(to_bridge(d)->max_age));
 }

 static int set_max_age(struct net_bridge *br, unsigned long val)
 {
 	unsigned long t = clock_t_to_jiffies(val);
 	br->max_age = t;
 	if (br_is_root_bridge(br))
 		br->bridge_max_age = t;
 	return 0;
 }

 static ssize_t store_max_age(struct device *d, struct device_attribute *attr,
 			     const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_max_age);
 }
 static DEVICE_ATTR(max_age, S_IRUGO | S_IWUSR, show_max_age, store_max_age);

 static ssize_t show_ageing_time(struct device *d,
 				struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
 }

 static int set_ageing_time(struct net_bridge *br, unsigned long val)
 {
 	br->ageing_time = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_ageing_time(struct device *d,
 				 struct device_attribute *attr,
 				 const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_ageing_time);
 }
 static DEVICE_ATTR(ageing_time, S_IRUGO | S_IWUSR, show_ageing_time,
 		   store_ageing_time);

 static ssize_t show_stp_state(struct device *d,
 			      struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%d\n", br->stp_enabled);
 }


 static ssize_t store_stp_state(struct device *d,
 			       struct device_attribute *attr, const char *buf,
 			       size_t len)
 {
 	struct net_bridge *br = to_bridge(d);
 	char *endp;
 	unsigned long val;

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

 	val = simple_strtoul(buf, &endp, 0);
 	if (endp == buf)
 		return -EINVAL;

 	if (!rtnl_trylock())
 		return restart_syscall();
 	br_stp_set_enabled(br, val);
 	rtnl_unlock();

 	return len;
 }
 static DEVICE_ATTR(stp_state, S_IRUGO | S_IWUSR, show_stp_state,
 		   store_stp_state);

 static ssize_t show_priority(struct device *d, struct device_attribute *attr,
 			     char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%d\n",
 		       (br->bridge_id.prio[0] << 8) | br->bridge_id.prio[1]);
 }

 static int set_priority(struct net_bridge *br, unsigned long val)
 {
 	br_stp_set_bridge_priority(br, (u16) val);
 	return 0;
 }

 static ssize_t store_priority(struct device *d, struct device_attribute *attr,
 			       const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_priority);
 }
 static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, show_priority, store_priority);

 static ssize_t show_root_id(struct device *d, struct device_attribute *attr,
 			    char *buf)
 {
 	return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
 }
 static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);

 static ssize_t show_bridge_id(struct device *d, struct device_attribute *attr,
 			      char *buf)
 {
 	return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
 }
 static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);

 static ssize_t show_root_port(struct device *d, struct device_attribute *attr,
 			      char *buf)
 {
 	return sprintf(buf, "%d\n", to_bridge(d)->root_port);
 }
 static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);

 static ssize_t show_root_path_cost(struct device *d,
 				   struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
 }
 static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);

 static ssize_t show_topology_change(struct device *d,
 				    struct device_attribute *attr, char *buf)
 {
 	return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
 }
 static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);

 static ssize_t show_topology_change_detected(struct device *d,
 					     struct device_attribute *attr,
 					     char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%d\n", br->topology_change_detected);
 }
 static DEVICE_ATTR(topology_change_detected, S_IRUGO,
 		   show_topology_change_detected, NULL);

 static ssize_t show_hello_timer(struct device *d,
 				struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
 }
 static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);

 static ssize_t show_tcn_timer(struct device *d, struct device_attribute *attr,
 			      char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
 }
 static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);

 static ssize_t show_topology_change_timer(struct device *d,
 					  struct device_attribute *attr,
 					  char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
 }
 static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
 		   NULL);

 static ssize_t show_gc_timer(struct device *d, struct device_attribute *attr,
 			     char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
 }
 static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);

 static ssize_t show_group_addr(struct device *d,
 			       struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
 		       br->group_addr[0], br->group_addr[1],
 		       br->group_addr[2], br->group_addr[3],
 		       br->group_addr[4], br->group_addr[5]);
 }

 static ssize_t store_group_addr(struct device *d,
 				struct device_attribute *attr,
 				const char *buf, size_t len)
 {
 	struct net_bridge *br = to_bridge(d);
 	unsigned new_addr[6];
 	int i;

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

 	if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
 		   &new_addr[0], &new_addr[1], &new_addr[2],
 		   &new_addr[3], &new_addr[4], &new_addr[5]) != 6)
 		return -EINVAL;

 	/* Must be 01:80:c2:00:00:0X */
 	for (i = 0; i < 5; i++)
 		if (new_addr[i] != br_group_address[i])
 			return -EINVAL;

 	if (new_addr[5] & ~0xf)
 		return -EINVAL;

 	if (new_addr[5] == 1 ||		/* 802.3x Pause address */
 	    new_addr[5] == 2 ||		/* 802.3ad Slow protocols */
 	    new_addr[5] == 3)		/* 802.1X PAE address */
 		return -EINVAL;

 	spin_lock_bh(&br->lock);
 	for (i = 0; i < 6; i++)
 		br->group_addr[i] = new_addr[i];
 	spin_unlock_bh(&br->lock);
 	return len;
 }

 static DEVICE_ATTR(group_addr, S_IRUGO | S_IWUSR,
 		   show_group_addr, store_group_addr);

 static ssize_t store_flush(struct device *d,
 			   struct device_attribute *attr,
 			   const char *buf, size_t len)
 {
 	struct net_bridge *br = to_bridge(d);

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

 	br_fdb_flush(br);
 	return len;
 }
 static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);

 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 static ssize_t show_multicast_router(struct device *d,
 				     struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%d\n", br->multicast_router);
 }

 static ssize_t store_multicast_router(struct device *d,
 				      struct device_attribute *attr,
 				      const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, br_multicast_set_router);
 }
 static DEVICE_ATTR(multicast_router, S_IRUGO | S_IWUSR, show_multicast_router,
 		   store_multicast_router);

 static ssize_t show_multicast_snooping(struct device *d,
 				       struct device_attribute *attr,
 				       char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%d\n", !br->multicast_disabled);
 }

 static ssize_t store_multicast_snooping(struct device *d,
 					struct device_attribute *attr,
 					const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, br_multicast_toggle);
 }
 static DEVICE_ATTR(multicast_snooping, S_IRUGO | S_IWUSR,
 		   show_multicast_snooping, store_multicast_snooping);

 static ssize_t show_hash_elasticity(struct device *d,
 				    struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%u\n", br->hash_elasticity);
 }

 static int set_elasticity(struct net_bridge *br, unsigned long val)
 {
 	br->hash_elasticity = val;
 	return 0;
 }

 static ssize_t store_hash_elasticity(struct device *d,
 				     struct device_attribute *attr,
 				     const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_elasticity);
 }
 static DEVICE_ATTR(hash_elasticity, S_IRUGO | S_IWUSR, show_hash_elasticity,
 		   store_hash_elasticity);

 static ssize_t show_hash_max(struct device *d, struct device_attribute *attr,
 			     char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%u\n", br->hash_max);
 }

 static ssize_t store_hash_max(struct device *d, struct device_attribute *attr,
 			      const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, br_multicast_set_hash_max);
 }
 static DEVICE_ATTR(hash_max, S_IRUGO | S_IWUSR, show_hash_max,
 		   store_hash_max);

 static ssize_t show_multicast_last_member_count(struct device *d,
 						struct device_attribute *attr,
 						char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%u\n", br->multicast_last_member_count);
 }

 static int set_last_member_count(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_last_member_count = val;
 	return 0;
 }

 static ssize_t store_multicast_last_member_count(struct device *d,
 						 struct device_attribute *attr,
 						 const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_last_member_count);
 }
 static DEVICE_ATTR(multicast_last_member_count, S_IRUGO | S_IWUSR,
 		   show_multicast_last_member_count,
 		   store_multicast_last_member_count);

 static ssize_t show_multicast_startup_query_count(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%u\n", br->multicast_startup_query_count);
 }

 static int set_startup_query_count(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_startup_query_count = val;
 	return 0;
 }

 static ssize_t store_multicast_startup_query_count(
 	struct device *d, struct device_attribute *attr, const char *buf,
 	size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_startup_query_count);
 }
 static DEVICE_ATTR(multicast_startup_query_count, S_IRUGO | S_IWUSR,
 		   show_multicast_startup_query_count,
 		   store_multicast_startup_query_count);

 static ssize_t show_multicast_last_member_interval(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%lu\n",
 		       jiffies_to_clock_t(br->multicast_last_member_interval));
 }

 static int set_last_member_interval(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_last_member_interval = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_multicast_last_member_interval(
 	struct device *d, struct device_attribute *attr, const char *buf,
 	size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_last_member_interval);
 }
 static DEVICE_ATTR(multicast_last_member_interval, S_IRUGO | S_IWUSR,
 		   show_multicast_last_member_interval,
 		   store_multicast_last_member_interval);

 static ssize_t show_multicast_membership_interval(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%lu\n",
 		       jiffies_to_clock_t(br->multicast_membership_interval));
 }

 static int set_membership_interval(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_membership_interval = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_multicast_membership_interval(
 	struct device *d, struct device_attribute *attr, const char *buf,
 	size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_membership_interval);
 }
 static DEVICE_ATTR(multicast_membership_interval, S_IRUGO | S_IWUSR,
 		   show_multicast_membership_interval,
 		   store_multicast_membership_interval);

 static ssize_t show_multicast_querier_interval(struct device *d,
 					       struct device_attribute *attr,
 					       char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%lu\n",
 		       jiffies_to_clock_t(br->multicast_querier_interval));
 }

 static int set_querier_interval(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_querier_interval = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_multicast_querier_interval(struct device *d,
 						struct device_attribute *attr,
 						const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_querier_interval);
 }
 static DEVICE_ATTR(multicast_querier_interval, S_IRUGO | S_IWUSR,
 		   show_multicast_querier_interval,
 		   store_multicast_querier_interval);

 static ssize_t show_multicast_query_interval(struct device *d,
 					     struct device_attribute *attr,
 					     char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(buf, "%lu\n",
 		       jiffies_to_clock_t(br->multicast_query_interval));
 }

 static int set_query_interval(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_query_interval = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_multicast_query_interval(struct device *d,
 					      struct device_attribute *attr,
 					      const char *buf, size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_query_interval);
 }
 static DEVICE_ATTR(multicast_query_interval, S_IRUGO | S_IWUSR,
 		   show_multicast_query_interval,
 		   store_multicast_query_interval);

 static ssize_t show_multicast_query_response_interval(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(
 		buf, "%lu\n",
 		jiffies_to_clock_t(br->multicast_query_response_interval));
 }

 static int set_query_response_interval(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_query_response_interval = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_multicast_query_response_interval(
 	struct device *d, struct device_attribute *attr, const char *buf,
 	size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_query_response_interval);
 }
 static DEVICE_ATTR(multicast_query_response_interval, S_IRUGO | S_IWUSR,
 		   show_multicast_query_response_interval,
 		   store_multicast_query_response_interval);

 static ssize_t show_multicast_startup_query_interval(
 	struct device *d, struct device_attribute *attr, char *buf)
 {
 	struct net_bridge *br = to_bridge(d);
 	return sprintf(
 		buf, "%lu\n",
 		jiffies_to_clock_t(br->multicast_startup_query_interval));
 }

 static int set_startup_query_interval(struct net_bridge *br, unsigned long val)
 {
 	br->multicast_startup_query_interval = clock_t_to_jiffies(val);
 	return 0;
 }

 static ssize_t store_multicast_startup_query_interval(
 	struct device *d, struct device_attribute *attr, const char *buf,
 	size_t len)
 {
 	return store_bridge_parm(d, buf, len, set_startup_query_interval);
 }
 static DEVICE_ATTR(multicast_startup_query_interval, S_IRUGO | S_IWUSR,
 		   show_multicast_startup_query_interval,
 		   store_multicast_startup_query_interval);
 #endif

 static struct attribute *bridge_attrs[] = {
 	&dev_attr_forward_delay.attr,
 	&dev_attr_hello_time.attr,
 	&dev_attr_max_age.attr,
 	&dev_attr_ageing_time.attr,
 	&dev_attr_stp_state.attr,
 	&dev_attr_priority.attr,
 	&dev_attr_bridge_id.attr,
 	&dev_attr_root_id.attr,
 	&dev_attr_root_path_cost.attr,
 	&dev_attr_root_port.attr,
 	&dev_attr_topology_change.attr,
 	&dev_attr_topology_change_detected.attr,
 	&dev_attr_hello_timer.attr,
 	&dev_attr_tcn_timer.attr,
 	&dev_attr_topology_change_timer.attr,
 	&dev_attr_gc_timer.attr,
 	&dev_attr_group_addr.attr,
 	&dev_attr_flush.attr,
 #ifdef CONFIG_BRIDGE_IGMP_SNOOPING
 	&dev_attr_multicast_router.attr,
 	&dev_attr_multicast_snooping.attr,
 	&dev_attr_hash_elasticity.attr,
 	&dev_attr_hash_max.attr,
 	&dev_attr_multicast_last_member_count.attr,
 	&dev_attr_multicast_startup_query_count.attr,
 	&dev_attr_multicast_last_member_interval.attr,
 	&dev_attr_multicast_membership_interval.attr,
 	&dev_attr_multicast_querier_interval.attr,
 	&dev_attr_multicast_query_interval.attr,
 	&dev_attr_multicast_query_response_interval.attr,
 	&dev_attr_multicast_startup_query_interval.attr,
 #endif
 	NULL
 };

 static struct attribute_group bridge_group = {
 	.name = SYSFS_BRIDGE_ATTR,
 	.attrs = bridge_attrs,
 };

 /*
  * Export the forwarding information table as a binary file
  * The records are struct __fdb_entry.
  *
  * Returns the number of bytes read.
  */
 static ssize_t brforward_read(struct file *filp, struct kobject *kobj,
 			      struct bin_attribute *bin_attr,
 			      char *buf, loff_t off, size_t count)
 {
 	struct device *dev = to_dev(kobj);
 	struct net_bridge *br = to_bridge(dev);
 	int n;

 	/* must read whole records */
 	if (off % sizeof(struct __fdb_entry) != 0)
 		return -EINVAL;

 	n =  br_fdb_fillbuf(br, buf,
 			    count / sizeof(struct __fdb_entry),
 			    off / sizeof(struct __fdb_entry));

 	if (n > 0)
 		n *= sizeof(struct __fdb_entry);

 	return n;
 }

 static struct bin_attribute bridge_forward = {
 	.attr = { .name = SYSFS_BRIDGE_FDB,
 		  .mode = S_IRUGO, },
 	.read = brforward_read,
 };

 /*
  * Add entries in sysfs onto the existing network class device
  * for the bridge.
  *   Adds a attribute group "bridge" containing tuning parameters.
  *   Binary attribute containing the forward table
  *   Sub directory to hold links to interfaces.
  *
  * Note: the ifobj exists only to be a subdirectory
  *   to hold links.  The ifobj exists in same data structure
  *   as it's parent the bridge so reference counting works.
  */
 int br_sysfs_addbr(struct net_device *dev)
 {
 	struct kobject *brobj = &dev->dev.kobj;
 	struct net_bridge *br = netdev_priv(dev);
 	int err;

 	err = sysfs_create_group(brobj, &bridge_group);
 	if (err) {
 		pr_info("%s: can't create group %s/%s\n",
 			__func__, dev->name, bridge_group.name);
 		goto out1;
 	}

 	err = sysfs_create_bin_file(brobj, &bridge_forward);
 	if (err) {
 		pr_info("%s: can't create attribute file %s/%s\n",
 			__func__, dev->name, bridge_forward.attr.name);
 		goto out2;
 	}

 	br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
 	if (!br->ifobj) {
 		pr_info("%s: can't add kobject (directory) %s/%s\n",
 			__func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
 		goto out3;
 	}
 	return 0;
  out3:
 	sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
  out2:
 	sysfs_remove_group(&dev->dev.kobj, &bridge_group);
  out1:
 	return err;

 }

 void br_sysfs_delbr(struct net_device *dev)
 {
 	struct kobject *kobj = &dev->dev.kobj;
 	struct net_bridge *br = netdev_priv(dev);

 	kobject_put(br->ifobj);
 	sysfs_remove_bin_file(kobj, &bridge_forward);
 	sysfs_remove_group(kobj, &bridge_group);
 }
	/*
	* Sysfs attributes of bridge ports
	* Linux ethernet bridge
	*
	* Authors:
	* 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_bridge.h>
	#include <linux/rtnetlink.h>
	#include <linux/spinlock.h>
	#include <linux/times.h>

	#include "br_private.h"

	#define to_dev(obj) container_of(obj, struct device, kobj)
	#define to_bridge(cd) ((struct net_bridge *)netdev_priv(to_net_dev(cd)))

	/*
	* Common code for storing bridge parameters.
	*/
	static ssize_t store_bridge_parm(struct device *d,
	const char *buf, size_t len,
	int (set)(struct net_bridge , unsigned long))
	{
	struct net_bridge *br = to_bridge(d);
	char *endp;
	unsigned long val;
	int err;

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

	val = simple_strtoul(buf, &endp, 0);
	if (endp == buf)
	return -EINVAL;

	spin_lock_bh(&br->lock);
	err = (*set)(br, val);
	spin_unlock_bh(&br->lock);
	return err ? err : len;
	}


	static ssize_t show_forward_delay(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->forward_delay));
	}

	static int set_forward_delay(struct net_bridge *br, unsigned long val)
	{
	unsigned long delay = clock_t_to_jiffies(val);
	br->forward_delay = delay;
	if (br_is_root_bridge(br))
	br->bridge_forward_delay = delay;
	return 0;
	}

	static ssize_t store_forward_delay(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_forward_delay);
	}
	static DEVICE_ATTR(forward_delay, S_IRUGO \| S_IWUSR,
	show_forward_delay, store_forward_delay);

	static ssize_t show_hello_time(struct device d, struct device_attribute attr,
	char *buf)
	{
	return sprintf(buf, "%lu\n",
	jiffies_to_clock_t(to_bridge(d)->hello_time));
	}

	static int set_hello_time(struct net_bridge *br, unsigned long val)
	{
	unsigned long t = clock_t_to_jiffies(val);

	if (t < HZ)
	return -EINVAL;

	br->hello_time = t;
	if (br_is_root_bridge(br))
	br->bridge_hello_time = t;
	return 0;
	}

	static ssize_t store_hello_time(struct device *d,
	struct device_attribute attr, const char buf,
	size_t len)
	{
	return store_bridge_parm(d, buf, len, set_hello_time);
	}
	static DEVICE_ATTR(hello_time, S_IRUGO \| S_IWUSR, show_hello_time,
	store_hello_time);

	static ssize_t show_max_age(struct device d, struct device_attribute attr,
	char *buf)
	{
	return sprintf(buf, "%lu\n",
	jiffies_to_clock_t(to_bridge(d)->max_age));
	}

	static int set_max_age(struct net_bridge *br, unsigned long val)
	{
	unsigned long t = clock_t_to_jiffies(val);
	br->max_age = t;
	if (br_is_root_bridge(br))
	br->bridge_max_age = t;
	return 0;
	}

	static ssize_t store_max_age(struct device d, struct device_attribute attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_max_age);
	}
	static DEVICE_ATTR(max_age, S_IRUGO \| S_IWUSR, show_max_age, store_max_age);

	static ssize_t show_ageing_time(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%lu\n", jiffies_to_clock_t(br->ageing_time));
	}

	static int set_ageing_time(struct net_bridge *br, unsigned long val)
	{
	br->ageing_time = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_ageing_time(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_ageing_time);
	}
	static DEVICE_ATTR(ageing_time, S_IRUGO \| S_IWUSR, show_ageing_time,
	store_ageing_time);

	static ssize_t show_stp_state(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%d\n", br->stp_enabled);
	}


	static ssize_t store_stp_state(struct device *d,
	struct device_attribute attr, const char buf,
	size_t len)
	{
	struct net_bridge *br = to_bridge(d);
	char *endp;
	unsigned long val;

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

	val = simple_strtoul(buf, &endp, 0);
	if (endp == buf)
	return -EINVAL;

	if (!rtnl_trylock())
	return restart_syscall();
	br_stp_set_enabled(br, val);
	rtnl_unlock();

	return len;
	}
	static DEVICE_ATTR(stp_state, S_IRUGO \| S_IWUSR, show_stp_state,
	store_stp_state);

	static ssize_t show_priority(struct device d, struct device_attribute attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%d\n",
	(br->bridge_id.prio[0] << 8) \| br->bridge_id.prio[1]);
	}

	static int set_priority(struct net_bridge *br, unsigned long val)
	{
	br_stp_set_bridge_priority(br, (u16) val);
	return 0;
	}

	static ssize_t store_priority(struct device d, struct device_attribute attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_priority);
	}
	static DEVICE_ATTR(priority, S_IRUGO \| S_IWUSR, show_priority, store_priority);

	static ssize_t show_root_id(struct device d, struct device_attribute attr,
	char *buf)
	{
	return br_show_bridge_id(buf, &to_bridge(d)->designated_root);
	}
	static DEVICE_ATTR(root_id, S_IRUGO, show_root_id, NULL);

	static ssize_t show_bridge_id(struct device d, struct device_attribute attr,
	char *buf)
	{
	return br_show_bridge_id(buf, &to_bridge(d)->bridge_id);
	}
	static DEVICE_ATTR(bridge_id, S_IRUGO, show_bridge_id, NULL);

	static ssize_t show_root_port(struct device d, struct device_attribute attr,
	char *buf)
	{
	return sprintf(buf, "%d\n", to_bridge(d)->root_port);
	}
	static DEVICE_ATTR(root_port, S_IRUGO, show_root_port, NULL);

	static ssize_t show_root_path_cost(struct device *d,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "%d\n", to_bridge(d)->root_path_cost);
	}
	static DEVICE_ATTR(root_path_cost, S_IRUGO, show_root_path_cost, NULL);

	static ssize_t show_topology_change(struct device *d,
	struct device_attribute attr, char buf)
	{
	return sprintf(buf, "%d\n", to_bridge(d)->topology_change);
	}
	static DEVICE_ATTR(topology_change, S_IRUGO, show_topology_change, NULL);

	static ssize_t show_topology_change_detected(struct device *d,
	struct device_attribute *attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%d\n", br->topology_change_detected);
	}
	static DEVICE_ATTR(topology_change_detected, S_IRUGO,
	show_topology_change_detected, NULL);

	static ssize_t show_hello_timer(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%ld\n", br_timer_value(&br->hello_timer));
	}
	static DEVICE_ATTR(hello_timer, S_IRUGO, show_hello_timer, NULL);

	static ssize_t show_tcn_timer(struct device d, struct device_attribute attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%ld\n", br_timer_value(&br->tcn_timer));
	}
	static DEVICE_ATTR(tcn_timer, S_IRUGO, show_tcn_timer, NULL);

	static ssize_t show_topology_change_timer(struct device *d,
	struct device_attribute *attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%ld\n", br_timer_value(&br->topology_change_timer));
	}
	static DEVICE_ATTR(topology_change_timer, S_IRUGO, show_topology_change_timer,
	NULL);

	static ssize_t show_gc_timer(struct device d, struct device_attribute attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%ld\n", br_timer_value(&br->gc_timer));
	}
	static DEVICE_ATTR(gc_timer, S_IRUGO, show_gc_timer, NULL);

	static ssize_t show_group_addr(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%x:%x:%x:%x:%x:%x\n",
	br->group_addr[0], br->group_addr[1],
	br->group_addr[2], br->group_addr[3],
	br->group_addr[4], br->group_addr[5]);
	}

	static ssize_t store_group_addr(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct net_bridge *br = to_bridge(d);
	unsigned new_addr[6];
	int i;

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

	if (sscanf(buf, "%x:%x:%x:%x:%x:%x",
	&new_addr[0], &new_addr[1], &new_addr[2],
	&new_addr[3], &new_addr[4], &new_addr[5]) != 6)
	return -EINVAL;

	/* Must be 01:80:c2:00:00:0X */
	for (i = 0; i < 5; i++)
	if (new_addr[i] != br_group_address[i])
	return -EINVAL;

	if (new_addr[5] & ~0xf)
	return -EINVAL;

	if (new_addr[5] == 1 \|\| /* 802.3x Pause address */
	new_addr[5] == 2 \|\| /* 802.3ad Slow protocols */
	new_addr[5] == 3) /* 802.1X PAE address */
	return -EINVAL;

	spin_lock_bh(&br->lock);
	for (i = 0; i < 6; i++)
	br->group_addr[i] = new_addr[i];
	spin_unlock_bh(&br->lock);
	return len;
	}

	static DEVICE_ATTR(group_addr, S_IRUGO \| S_IWUSR,
	show_group_addr, store_group_addr);

	static ssize_t store_flush(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	struct net_bridge *br = to_bridge(d);

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

	br_fdb_flush(br);
	return len;
	}
	static DEVICE_ATTR(flush, S_IWUSR, NULL, store_flush);

	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	static ssize_t show_multicast_router(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%d\n", br->multicast_router);
	}

	static ssize_t store_multicast_router(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, br_multicast_set_router);
	}
	static DEVICE_ATTR(multicast_router, S_IRUGO \| S_IWUSR, show_multicast_router,
	store_multicast_router);

	static ssize_t show_multicast_snooping(struct device *d,
	struct device_attribute *attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%d\n", !br->multicast_disabled);
	}

	static ssize_t store_multicast_snooping(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, br_multicast_toggle);
	}
	static DEVICE_ATTR(multicast_snooping, S_IRUGO \| S_IWUSR,
	show_multicast_snooping, store_multicast_snooping);

	static ssize_t show_hash_elasticity(struct device *d,
	struct device_attribute attr, char buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%u\n", br->hash_elasticity);
	}

	static int set_elasticity(struct net_bridge *br, unsigned long val)
	{
	br->hash_elasticity = val;
	return 0;
	}

	static ssize_t store_hash_elasticity(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_elasticity);
	}
	static DEVICE_ATTR(hash_elasticity, S_IRUGO \| S_IWUSR, show_hash_elasticity,
	store_hash_elasticity);

	static ssize_t show_hash_max(struct device d, struct device_attribute attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%u\n", br->hash_max);
	}

	static ssize_t store_hash_max(struct device d, struct device_attribute attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, br_multicast_set_hash_max);
	}
	static DEVICE_ATTR(hash_max, S_IRUGO \| S_IWUSR, show_hash_max,
	store_hash_max);

	static ssize_t show_multicast_last_member_count(struct device *d,
	struct device_attribute *attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%u\n", br->multicast_last_member_count);
	}

	static int set_last_member_count(struct net_bridge *br, unsigned long val)
	{
	br->multicast_last_member_count = val;
	return 0;
	}

	static ssize_t store_multicast_last_member_count(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_last_member_count);
	}
	static DEVICE_ATTR(multicast_last_member_count, S_IRUGO \| S_IWUSR,
	show_multicast_last_member_count,
	store_multicast_last_member_count);

	static ssize_t show_multicast_startup_query_count(
	struct device d, struct device_attribute attr, char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%u\n", br->multicast_startup_query_count);
	}

	static int set_startup_query_count(struct net_bridge *br, unsigned long val)
	{
	br->multicast_startup_query_count = val;
	return 0;
	}

	static ssize_t store_multicast_startup_query_count(
	struct device d, struct device_attribute attr, const char *buf,
	size_t len)
	{
	return store_bridge_parm(d, buf, len, set_startup_query_count);
	}
	static DEVICE_ATTR(multicast_startup_query_count, S_IRUGO \| S_IWUSR,
	show_multicast_startup_query_count,
	store_multicast_startup_query_count);

	static ssize_t show_multicast_last_member_interval(
	struct device d, struct device_attribute attr, char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%lu\n",
	jiffies_to_clock_t(br->multicast_last_member_interval));
	}

	static int set_last_member_interval(struct net_bridge *br, unsigned long val)
	{
	br->multicast_last_member_interval = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_multicast_last_member_interval(
	struct device d, struct device_attribute attr, const char *buf,
	size_t len)
	{
	return store_bridge_parm(d, buf, len, set_last_member_interval);
	}
	static DEVICE_ATTR(multicast_last_member_interval, S_IRUGO \| S_IWUSR,
	show_multicast_last_member_interval,
	store_multicast_last_member_interval);

	static ssize_t show_multicast_membership_interval(
	struct device d, struct device_attribute attr, char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%lu\n",
	jiffies_to_clock_t(br->multicast_membership_interval));
	}

	static int set_membership_interval(struct net_bridge *br, unsigned long val)
	{
	br->multicast_membership_interval = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_multicast_membership_interval(
	struct device d, struct device_attribute attr, const char *buf,
	size_t len)
	{
	return store_bridge_parm(d, buf, len, set_membership_interval);
	}
	static DEVICE_ATTR(multicast_membership_interval, S_IRUGO \| S_IWUSR,
	show_multicast_membership_interval,
	store_multicast_membership_interval);

	static ssize_t show_multicast_querier_interval(struct device *d,
	struct device_attribute *attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%lu\n",
	jiffies_to_clock_t(br->multicast_querier_interval));
	}

	static int set_querier_interval(struct net_bridge *br, unsigned long val)
	{
	br->multicast_querier_interval = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_multicast_querier_interval(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_querier_interval);
	}
	static DEVICE_ATTR(multicast_querier_interval, S_IRUGO \| S_IWUSR,
	show_multicast_querier_interval,
	store_multicast_querier_interval);

	static ssize_t show_multicast_query_interval(struct device *d,
	struct device_attribute *attr,
	char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(buf, "%lu\n",
	jiffies_to_clock_t(br->multicast_query_interval));
	}

	static int set_query_interval(struct net_bridge *br, unsigned long val)
	{
	br->multicast_query_interval = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_multicast_query_interval(struct device *d,
	struct device_attribute *attr,
	const char *buf, size_t len)
	{
	return store_bridge_parm(d, buf, len, set_query_interval);
	}
	static DEVICE_ATTR(multicast_query_interval, S_IRUGO \| S_IWUSR,
	show_multicast_query_interval,
	store_multicast_query_interval);

	static ssize_t show_multicast_query_response_interval(
	struct device d, struct device_attribute attr, char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(
	buf, "%lu\n",
	jiffies_to_clock_t(br->multicast_query_response_interval));
	}

	static int set_query_response_interval(struct net_bridge *br, unsigned long val)
	{
	br->multicast_query_response_interval = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_multicast_query_response_interval(
	struct device d, struct device_attribute attr, const char *buf,
	size_t len)
	{
	return store_bridge_parm(d, buf, len, set_query_response_interval);
	}
	static DEVICE_ATTR(multicast_query_response_interval, S_IRUGO \| S_IWUSR,
	show_multicast_query_response_interval,
	store_multicast_query_response_interval);

	static ssize_t show_multicast_startup_query_interval(
	struct device d, struct device_attribute attr, char *buf)
	{
	struct net_bridge *br = to_bridge(d);
	return sprintf(
	buf, "%lu\n",
	jiffies_to_clock_t(br->multicast_startup_query_interval));
	}

	static int set_startup_query_interval(struct net_bridge *br, unsigned long val)
	{
	br->multicast_startup_query_interval = clock_t_to_jiffies(val);
	return 0;
	}

	static ssize_t store_multicast_startup_query_interval(
	struct device d, struct device_attribute attr, const char *buf,
	size_t len)
	{
	return store_bridge_parm(d, buf, len, set_startup_query_interval);
	}
	static DEVICE_ATTR(multicast_startup_query_interval, S_IRUGO \| S_IWUSR,
	show_multicast_startup_query_interval,
	store_multicast_startup_query_interval);
	#endif

	static struct attribute *bridge_attrs[] = {
	&dev_attr_forward_delay.attr,
	&dev_attr_hello_time.attr,
	&dev_attr_max_age.attr,
	&dev_attr_ageing_time.attr,
	&dev_attr_stp_state.attr,
	&dev_attr_priority.attr,
	&dev_attr_bridge_id.attr,
	&dev_attr_root_id.attr,
	&dev_attr_root_path_cost.attr,
	&dev_attr_root_port.attr,
	&dev_attr_topology_change.attr,
	&dev_attr_topology_change_detected.attr,
	&dev_attr_hello_timer.attr,
	&dev_attr_tcn_timer.attr,
	&dev_attr_topology_change_timer.attr,
	&dev_attr_gc_timer.attr,
	&dev_attr_group_addr.attr,
	&dev_attr_flush.attr,
	#ifdef CONFIG_BRIDGE_IGMP_SNOOPING
	&dev_attr_multicast_router.attr,
	&dev_attr_multicast_snooping.attr,
	&dev_attr_hash_elasticity.attr,
	&dev_attr_hash_max.attr,
	&dev_attr_multicast_last_member_count.attr,
	&dev_attr_multicast_startup_query_count.attr,
	&dev_attr_multicast_last_member_interval.attr,
	&dev_attr_multicast_membership_interval.attr,
	&dev_attr_multicast_querier_interval.attr,
	&dev_attr_multicast_query_interval.attr,
	&dev_attr_multicast_query_response_interval.attr,
	&dev_attr_multicast_startup_query_interval.attr,
	#endif
	NULL
	};

	static struct attribute_group bridge_group = {
	.name = SYSFS_BRIDGE_ATTR,
	.attrs = bridge_attrs,
	};

	/*
	* Export the forwarding information table as a binary file
	* The records are struct __fdb_entry.
	*
	* Returns the number of bytes read.
	*/
	static ssize_t brforward_read(struct file filp, struct kobject kobj,
	struct bin_attribute *bin_attr,
	char *buf, loff_t off, size_t count)
	{
	struct device *dev = to_dev(kobj);
	struct net_bridge *br = to_bridge(dev);
	int n;

	/* must read whole records */
	if (off % sizeof(struct __fdb_entry) != 0)
	return -EINVAL;

	n = br_fdb_fillbuf(br, buf,
	count / sizeof(struct __fdb_entry),
	off / sizeof(struct __fdb_entry));

	if (n > 0)
	n *= sizeof(struct __fdb_entry);

	return n;
	}

	static struct bin_attribute bridge_forward = {
	.attr = { .name = SYSFS_BRIDGE_FDB,
	.mode = S_IRUGO, },
	.read = brforward_read,
	};

	/*
	* Add entries in sysfs onto the existing network class device
	* for the bridge.
	* Adds a attribute group "bridge" containing tuning parameters.
	* Binary attribute containing the forward table
	* Sub directory to hold links to interfaces.
	*
	* Note: the ifobj exists only to be a subdirectory
	* to hold links. The ifobj exists in same data structure
	* as it's parent the bridge so reference counting works.
	*/
	int br_sysfs_addbr(struct net_device *dev)
	{
	struct kobject *brobj = &dev->dev.kobj;
	struct net_bridge *br = netdev_priv(dev);
	int err;

	err = sysfs_create_group(brobj, &bridge_group);
	if (err) {
	pr_info("%s: can't create group %s/%s\n",
	__func__, dev->name, bridge_group.name);
	goto out1;
	}

	err = sysfs_create_bin_file(brobj, &bridge_forward);
	if (err) {
	pr_info("%s: can't create attribute file %s/%s\n",
	__func__, dev->name, bridge_forward.attr.name);
	goto out2;
	}

	br->ifobj = kobject_create_and_add(SYSFS_BRIDGE_PORT_SUBDIR, brobj);
	if (!br->ifobj) {
	pr_info("%s: can't add kobject (directory) %s/%s\n",
	__func__, dev->name, SYSFS_BRIDGE_PORT_SUBDIR);
	goto out3;
	}
	return 0;
	out3:
	sysfs_remove_bin_file(&dev->dev.kobj, &bridge_forward);
	out2:
	sysfs_remove_group(&dev->dev.kobj, &bridge_group);
	out1:
	return err;

	}

	void br_sysfs_delbr(struct net_device *dev)
	{
	struct kobject *kobj = &dev->dev.kobj;
	struct net_bridge *br = netdev_priv(dev);

	kobject_put(br->ifobj);
	sysfs_remove_bin_file(kobj, &bridge_forward);
	sysfs_remove_group(kobj, &bridge_group);
	}