/* Copyright (C) 2010-2014 B.A.T.M.A.N. contributors:
   *
   * Marek Lindner
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of version 2 of the GNU General Public
   * License as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, see <http://www.gnu.org/licenses/>.
   */
  
  #include "main.h"
  #include "sysfs.h"
  #include "translation-table.h"
  #include "distributed-arp-table.h"
  #include "network-coding.h"
  #include "originator.h"
  #include "hard-interface.h"
  #include "soft-interface.h"
  #include "gateway_common.h"
  #include "gateway_client.h"
  
  static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  {
  	struct device *dev = container_of(obj->parent, struct device, kobj);
  	return to_net_dev(dev);
  }
  
  static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  	return netdev_priv(net_dev);
  }
  
  /**
   * batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv
   * @obj: kobject to covert
   *
   * Returns the associated batadv_priv struct.
   */
  static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  {
  	/* VLAN specific attributes are located in the root sysfs folder if they
  	 * refer to the untagged VLAN..
  	 */
  	if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  		return batadv_kobj_to_batpriv(obj);
  
  	/* ..while the attributes for the tagged vlans are located in
  	 * the in the corresponding "vlan%VID" subfolder
  	 */
  	return batadv_kobj_to_batpriv(obj->parent);
  }
  
  /**
   * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct
   * @obj: kobject to covert
   *
   * Returns the associated softif_vlan struct if found, NULL otherwise.
   */
  static struct batadv_softif_vlan *
  batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  {
  	struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
  
  	rcu_read_lock();
  	hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
  		if (vlan_tmp->kobj != obj)
  			continue;
  
  		if (!atomic_inc_not_zero(&vlan_tmp->refcount))
  			continue;
  
  		vlan = vlan_tmp;
  		break;
  	}
  	rcu_read_unlock();
  
  	return vlan;
  }
  
  #define BATADV_UEV_TYPE_VAR	"BATTYPE="
  #define BATADV_UEV_ACTION_VAR	"BATACTION="
  #define BATADV_UEV_DATA_VAR	"BATDATA="
  
  static char *batadv_uev_action_str[] = {
  	"add",
  	"del",
  	"change"
  };
  
  static char *batadv_uev_type_str[] = {
  	"gw"
  };
  
  /* Use this, if you have customized show and store functions for vlan attrs */
  #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)	\
  struct batadv_attribute batadv_attr_vlan_##_name = {	\
  	.attr = {.name = __stringify(_name),		\
  		 .mode = _mode },			\
  	.show   = _show,				\
  	.store  = _store,				\
  };
  
  /* Use this, if you have customized show and store functions */
  #define BATADV_ATTR(_name, _mode, _show, _store)	\
  struct batadv_attribute batadv_attr_##_name = {		\
  	.attr = {.name = __stringify(_name),		\
  		 .mode = _mode },			\
  	.show   = _show,				\
  	.store  = _store,				\
  };
  
  #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)			\
  ssize_t batadv_store_##_name(struct kobject *kobj,			\
  			     struct attribute *attr, char *buff,	\
  			     size_t count)				\
  {									\
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);	\
  	struct batadv_priv *bat_priv = netdev_priv(net_dev);		\
  	return __batadv_store_bool_attr(buff, count, _post_func, attr,	\
  					&bat_priv->_name, net_dev);	\
  }
  
  #define BATADV_ATTR_SIF_SHOW_BOOL(_name)				\
  ssize_t batadv_show_##_name(struct kobject *kobj,			\
  			    struct attribute *attr, char *buff)		\
  {									\
  	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);	\
  	return sprintf(buff, "%s
  ",					\
  		       atomic_read(&bat_priv->_name) == 0 ?		\
  		       "disabled" : "enabled");				\
  }									\
  
  /* Use this, if you are going to turn a [name] in the soft-interface
   * (bat_priv) on or off
   */
  #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)			\
  	static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)		\
  	static BATADV_ATTR_SIF_SHOW_BOOL(_name)				\
  	static BATADV_ATTR(_name, _mode, batadv_show_##_name,		\
  			   batadv_store_##_name)
  
  
  #define BATADV_ATTR_SIF_STORE_UINT(_name, _min, _max, _post_func)	\
  ssize_t batadv_store_##_name(struct kobject *kobj,			\
  			     struct attribute *attr, char *buff,	\
  			     size_t count)				\
  {									\
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);	\
  	struct batadv_priv *bat_priv = netdev_priv(net_dev);		\
  	return __batadv_store_uint_attr(buff, count, _min, _max,	\
  					_post_func, attr,		\
  					&bat_priv->_name, net_dev);	\
  }
  
  #define BATADV_ATTR_SIF_SHOW_UINT(_name)				\
  ssize_t batadv_show_##_name(struct kobject *kobj,			\
  			    struct attribute *attr, char *buff)		\
  {									\
  	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);	\
  	return sprintf(buff, "%i
  ", atomic_read(&bat_priv->_name));	\
  }									\
  
  /* Use this, if you are going to set [name] in the soft-interface
   * (bat_priv) to an unsigned integer value
   */
  #define BATADV_ATTR_SIF_UINT(_name, _mode, _min, _max, _post_func)	\
  	static BATADV_ATTR_SIF_STORE_UINT(_name, _min, _max, _post_func)\
  	static BATADV_ATTR_SIF_SHOW_UINT(_name)				\
  	static BATADV_ATTR(_name, _mode, batadv_show_##_name,		\
  			   batadv_store_##_name)
  
  #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)			\
  ssize_t batadv_store_vlan_##_name(struct kobject *kobj,			\
  				  struct attribute *attr, char *buff,	\
  				  size_t count)				\
  {									\
  	struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
  	struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv,	\
  							      kobj);	\
  	size_t res = __batadv_store_bool_attr(buff, count, _post_func,	\
  					      attr, &vlan->_name,	\
  					      bat_priv->soft_iface);	\
  	batadv_softif_vlan_free_ref(vlan);				\
  	return res;							\
  }
  
  #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)				\
  ssize_t batadv_show_vlan_##_name(struct kobject *kobj,			\
  				 struct attribute *attr, char *buff)	\
  {									\
  	struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
  	struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv,	\
  							      kobj);	\
  	size_t res = sprintf(buff, "%s
  ",				\
  			     atomic_read(&vlan->_name) == 0 ?		\
  			     "disabled" : "enabled");			\
  	batadv_softif_vlan_free_ref(vlan);				\
  	return res;							\
  }
  
  /* Use this, if you are going to turn a [name] in the vlan struct on or off */
  #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)			\
  	static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)		\
  	static BATADV_ATTR_VLAN_SHOW_BOOL(_name)			\
  	static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name,	\
  				batadv_store_vlan_##_name)
  
  static int batadv_store_bool_attr(char *buff, size_t count,
  				  struct net_device *net_dev,
  				  const char *attr_name, atomic_t *attr)
  {
  	int enabled = -1;
  
  	if (buff[count - 1] == '
  ')
  		buff[count - 1] = '\0';
  
  	if ((strncmp(buff, "1", 2) == 0) ||
  	    (strncmp(buff, "enable", 7) == 0) ||
  	    (strncmp(buff, "enabled", 8) == 0))
  		enabled = 1;
  
  	if ((strncmp(buff, "0", 2) == 0) ||
  	    (strncmp(buff, "disable", 8) == 0) ||
  	    (strncmp(buff, "disabled", 9) == 0))
  		enabled = 0;
  
  	if (enabled < 0) {
  		batadv_info(net_dev, "%s: Invalid parameter received: %s
  ",
  			    attr_name, buff);
  		return -EINVAL;
  	}
  
  	if (atomic_read(attr) == enabled)
  		return count;
  
  	batadv_info(net_dev, "%s: Changing from: %s to: %s
  ", attr_name,
  		    atomic_read(attr) == 1 ? "enabled" : "disabled",
  		    enabled == 1 ? "enabled" : "disabled");
  
  	atomic_set(attr, (unsigned int)enabled);
  	return count;
  }
  
  static inline ssize_t
  __batadv_store_bool_attr(char *buff, size_t count,
  			 void (*post_func)(struct net_device *),
  			 struct attribute *attr,
  			 atomic_t *attr_store, struct net_device *net_dev)
  {
  	int ret;
  
  	ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
  				     attr_store);
  	if (post_func && ret)
  		post_func(net_dev);
  
  	return ret;
  }
  
  static int batadv_store_uint_attr(const char *buff, size_t count,
  				  struct net_device *net_dev,
  				  const char *attr_name,
  				  unsigned int min, unsigned int max,
  				  atomic_t *attr)
  {
  	unsigned long uint_val;
  	int ret;
  
  	ret = kstrtoul(buff, 10, &uint_val);
  	if (ret) {
  		batadv_info(net_dev, "%s: Invalid parameter received: %s
  ",
  			    attr_name, buff);
  		return -EINVAL;
  	}
  
  	if (uint_val < min) {
  		batadv_info(net_dev, "%s: Value is too small: %lu min: %u
  ",
  			    attr_name, uint_val, min);
  		return -EINVAL;
  	}
  
  	if (uint_val > max) {
  		batadv_info(net_dev, "%s: Value is too big: %lu max: %u
  ",
  			    attr_name, uint_val, max);
  		return -EINVAL;
  	}
  
  	if (atomic_read(attr) == uint_val)
  		return count;
  
  	batadv_info(net_dev, "%s: Changing from: %i to: %lu
  ",
  		    attr_name, atomic_read(attr), uint_val);
  
  	atomic_set(attr, uint_val);
  	return count;
  }
  
  static inline ssize_t
  __batadv_store_uint_attr(const char *buff, size_t count,
  			 int min, int max,
  			 void (*post_func)(struct net_device *),
  			 const struct attribute *attr,
  			 atomic_t *attr_store, struct net_device *net_dev)
  {
  	int ret;
  
  	ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
  				     attr_store);
  	if (post_func && ret)
  		post_func(net_dev);
  
  	return ret;
  }
  
  static ssize_t batadv_show_bat_algo(struct kobject *kobj,
  				    struct attribute *attr, char *buff)
  {
  	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
  	return sprintf(buff, "%s
  ", bat_priv->bat_algo_ops->name);
  }
  
  static void batadv_post_gw_reselect(struct net_device *net_dev)
  {
  	struct batadv_priv *bat_priv = netdev_priv(net_dev);
  	batadv_gw_reselect(bat_priv);
  }
  
  static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
  				   char *buff)
  {
  	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
  	int bytes_written;
  
  	switch (atomic_read(&bat_priv->gw_mode)) {
  	case BATADV_GW_MODE_CLIENT:
  		bytes_written = sprintf(buff, "%s
  ",
  					BATADV_GW_MODE_CLIENT_NAME);
  		break;
  	case BATADV_GW_MODE_SERVER:
  		bytes_written = sprintf(buff, "%s
  ",
  					BATADV_GW_MODE_SERVER_NAME);
  		break;
  	default:
  		bytes_written = sprintf(buff, "%s
  ",
  					BATADV_GW_MODE_OFF_NAME);
  		break;
  	}
  
  	return bytes_written;
  }
  
  static ssize_t batadv_store_gw_mode(struct kobject *kobj,
  				    struct attribute *attr, char *buff,
  				    size_t count)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
  	struct batadv_priv *bat_priv = netdev_priv(net_dev);
  	char *curr_gw_mode_str;
  	int gw_mode_tmp = -1;
  
  	if (buff[count - 1] == '
  ')
  		buff[count - 1] = '\0';
  
  	if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
  		    strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
  		gw_mode_tmp = BATADV_GW_MODE_OFF;
  
  	if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
  		    strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
  		gw_mode_tmp = BATADV_GW_MODE_CLIENT;
  
  	if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
  		    strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
  		gw_mode_tmp = BATADV_GW_MODE_SERVER;
  
  	if (gw_mode_tmp < 0) {
  		batadv_info(net_dev,
  			    "Invalid parameter for 'gw mode' setting received: %s
  ",
  			    buff);
  		return -EINVAL;
  	}
  
  	if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
  		return count;
  
  	switch (atomic_read(&bat_priv->gw_mode)) {
  	case BATADV_GW_MODE_CLIENT:
  		curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
  		break;
  	case BATADV_GW_MODE_SERVER:
  		curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
  		break;
  	default:
  		curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
  		break;
  	}
  
  	batadv_info(net_dev, "Changing gw mode from: %s to: %s
  ",
  		    curr_gw_mode_str, buff);
  
  	/* Invoking batadv_gw_reselect() is not enough to really de-select the
  	 * current GW. It will only instruct the gateway client code to perform
  	 * a re-election the next time that this is needed.
  	 *
  	 * When gw client mode is being switched off the current GW must be
  	 * de-selected explicitly otherwise no GW_ADD uevent is thrown on
  	 * client mode re-activation. This is operation is performed in
  	 * batadv_gw_check_client_stop().
  	 */
  	batadv_gw_reselect(bat_priv);
  	/* always call batadv_gw_check_client_stop() before changing the gateway
  	 * state
  	 */
  	batadv_gw_check_client_stop(bat_priv);
  	atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp);
  	batadv_gw_tvlv_container_update(bat_priv);
  	return count;
  }
  
  static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
  				     struct attribute *attr, char *buff)
  {
  	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
  	uint32_t down, up;
  
  	down = atomic_read(&bat_priv->gw.bandwidth_down);
  	up = atomic_read(&bat_priv->gw.bandwidth_up);
  
  	return sprintf(buff, "%u.%u/%u.%u MBit
  ", down / 10,
  		       down % 10, up / 10, up % 10);
  }
  
  static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
  				      struct attribute *attr, char *buff,
  				      size_t count)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
  
  	if (buff[count - 1] == '
  ')
  		buff[count - 1] = '\0';
  
  	return batadv_gw_bandwidth_set(net_dev, buff, count);
  }
  
  /**
   * batadv_show_isolation_mark - print the current isolation mark/mask
   * @kobj: kobject representing the private mesh sysfs directory
   * @attr: the batman-adv attribute the user is interacting with
   * @buff: the buffer that will contain the data to send back to the user
   *
   * Returns the number of bytes written into 'buff' on success or a negative
   * error code in case of failure
   */
  static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
  					  struct attribute *attr, char *buff)
  {
  	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
  
  	return sprintf(buff, "%#.8x/%#.8x
  ", bat_priv->isolation_mark,
  		       bat_priv->isolation_mark_mask);
  }
  
  /**
   * batadv_store_isolation_mark - parse and store the isolation mark/mask entered
   *  by the user
   * @kobj: kobject representing the private mesh sysfs directory
   * @attr: the batman-adv attribute the user is interacting with
   * @buff: the buffer containing the user data
   * @count: number of bytes in the buffer
   *
   * Returns 'count' on success or a negative error code in case of failure
   */
  static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
  					   struct attribute *attr, char *buff,
  					   size_t count)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
  	struct batadv_priv *bat_priv = netdev_priv(net_dev);
  	uint32_t mark, mask;
  	char *mask_ptr;
  
  	/* parse the mask if it has been specified, otherwise assume the mask is
  	 * the biggest possible
  	 */
  	mask = 0xFFFFFFFF;
  	mask_ptr = strchr(buff, '/');
  	if (mask_ptr) {
  		*mask_ptr = '\0';
  		mask_ptr++;
  
  		/* the mask must be entered in hex base as it is going to be a
  		 * bitmask and not a prefix length
  		 */
  		if (kstrtou32(mask_ptr, 16, &mask) < 0)
  			return -EINVAL;
  	}
  
  	/* the mark can be entered in any base */
  	if (kstrtou32(buff, 0, &mark) < 0)
  		return -EINVAL;
  
  	bat_priv->isolation_mark_mask = mask;
  	/* erase bits not covered by the mask */
  	bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
  
  	batadv_info(net_dev,
  		    "New skb mark for extended isolation: %#.8x/%#.8x
  ",
  		    bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
  
  	return count;
  }
  
  BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
  BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
  #ifdef CONFIG_BATMAN_ADV_BLA
  BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR, NULL);
  #endif
  #ifdef CONFIG_BATMAN_ADV_DAT
  BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR,
  		     batadv_dat_status_update);
  #endif
  BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
  static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
  static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
  		   batadv_store_gw_mode);
  BATADV_ATTR_SIF_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * BATADV_JITTER,
  		     INT_MAX, NULL);
  BATADV_ATTR_SIF_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, BATADV_TQ_MAX_VALUE,
  		     NULL);
  BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE,
  		     batadv_post_gw_reselect);
  static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
  		   batadv_store_gw_bwidth);
  #ifdef CONFIG_BATMAN_ADV_DEBUG
  BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL);
  #endif
  #ifdef CONFIG_BATMAN_ADV_NC
  BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR,
  		     batadv_nc_status_update);
  #endif
  static BATADV_ATTR(isolation_mark, S_IRUGO | S_IWUSR,
  		   batadv_show_isolation_mark, batadv_store_isolation_mark);
  
  static struct batadv_attribute *batadv_mesh_attrs[] = {
  	&batadv_attr_aggregated_ogms,
  	&batadv_attr_bonding,
  #ifdef CONFIG_BATMAN_ADV_BLA
  	&batadv_attr_bridge_loop_avoidance,
  #endif
  #ifdef CONFIG_BATMAN_ADV_DAT
  	&batadv_attr_distributed_arp_table,
  #endif
  	&batadv_attr_fragmentation,
  	&batadv_attr_routing_algo,
  	&batadv_attr_gw_mode,
  	&batadv_attr_orig_interval,
  	&batadv_attr_hop_penalty,
  	&batadv_attr_gw_sel_class,
  	&batadv_attr_gw_bandwidth,
  #ifdef CONFIG_BATMAN_ADV_DEBUG
  	&batadv_attr_log_level,
  #endif
  #ifdef CONFIG_BATMAN_ADV_NC
  	&batadv_attr_network_coding,
  #endif
  	&batadv_attr_isolation_mark,
  	NULL,
  };
  
  BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
  
  /**
   * batadv_vlan_attrs - array of vlan specific sysfs attributes
   */
  static struct batadv_attribute *batadv_vlan_attrs[] = {
  	&batadv_attr_vlan_ap_isolation,
  	NULL,
  };
  
  int batadv_sysfs_add_meshif(struct net_device *dev)
  {
  	struct kobject *batif_kobject = &dev->dev.kobj;
  	struct batadv_priv *bat_priv = netdev_priv(dev);
  	struct batadv_attribute **bat_attr;
  	int err;
  
  	bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
  						    batif_kobject);
  	if (!bat_priv->mesh_obj) {
  		batadv_err(dev, "Can't add sysfs directory: %s/%s
  ", dev->name,
  			   BATADV_SYSFS_IF_MESH_SUBDIR);
  		goto out;
  	}
  
  	for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
  		err = sysfs_create_file(bat_priv->mesh_obj,
  					&((*bat_attr)->attr));
  		if (err) {
  			batadv_err(dev, "Can't add sysfs file: %s/%s/%s
  ",
  				   dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
  				   ((*bat_attr)->attr).name);
  			goto rem_attr;
  		}
  	}
  
  	return 0;
  
  rem_attr:
  	for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
  		sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
  
  	kobject_put(bat_priv->mesh_obj);
  	bat_priv->mesh_obj = NULL;
  out:
  	return -ENOMEM;
  }
  
  void batadv_sysfs_del_meshif(struct net_device *dev)
  {
  	struct batadv_priv *bat_priv = netdev_priv(dev);
  	struct batadv_attribute **bat_attr;
  
  	for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
  		sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
  
  	kobject_put(bat_priv->mesh_obj);
  	bat_priv->mesh_obj = NULL;
  }
  
  /**
   * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan
   * @dev: netdev of the mesh interface
   * @vlan: private data of the newly added VLAN interface
   *
   * Returns 0 on success and -ENOMEM if any of the structure allocations fails.
   */
  int batadv_sysfs_add_vlan(struct net_device *dev,
  			  struct batadv_softif_vlan *vlan)
  {
  	char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
  	struct batadv_priv *bat_priv = netdev_priv(dev);
  	struct batadv_attribute **bat_attr;
  	int err;
  
  	if (vlan->vid & BATADV_VLAN_HAS_TAG) {
  		sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
  			vlan->vid & VLAN_VID_MASK);
  
  		vlan->kobj = kobject_create_and_add(vlan_subdir,
  						    bat_priv->mesh_obj);
  		if (!vlan->kobj) {
  			batadv_err(dev, "Can't add sysfs directory: %s/%s
  ",
  				   dev->name, vlan_subdir);
  			goto out;
  		}
  	} else {
  		/* the untagged LAN uses the root folder to store its "VLAN
  		 * specific attributes"
  		 */
  		vlan->kobj = bat_priv->mesh_obj;
  		kobject_get(bat_priv->mesh_obj);
  	}
  
  	for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
  		err = sysfs_create_file(vlan->kobj,
  					&((*bat_attr)->attr));
  		if (err) {
  			batadv_err(dev, "Can't add sysfs file: %s/%s/%s
  ",
  				   dev->name, vlan_subdir,
  				   ((*bat_attr)->attr).name);
  			goto rem_attr;
  		}
  	}
  
  	return 0;
  
  rem_attr:
  	for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
  		sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
  
  	kobject_put(vlan->kobj);
  	vlan->kobj = NULL;
  out:
  	return -ENOMEM;
  }
  
  /**
   * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN
   * @bat_priv: the bat priv with all the soft interface information
   * @vlan: the private data of the VLAN to destroy
   */
  void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
  			   struct batadv_softif_vlan *vlan)
  {
  	struct batadv_attribute **bat_attr;
  
  	for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
  		sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
  
  	kobject_put(vlan->kobj);
  	vlan->kobj = NULL;
  }
  
  static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
  				      struct attribute *attr, char *buff)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
  	struct batadv_hard_iface *hard_iface;
  	ssize_t length;
  	const char *ifname;
  
  	hard_iface = batadv_hardif_get_by_netdev(net_dev);
  	if (!hard_iface)
  		return 0;
  
  	if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
  		ifname =  "none";
  	else
  		ifname = hard_iface->soft_iface->name;
  
  	length = sprintf(buff, "%s
  ", ifname);
  
  	batadv_hardif_free_ref(hard_iface);
  
  	return length;
  }
  
  static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
  				       struct attribute *attr, char *buff,
  				       size_t count)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
  	struct batadv_hard_iface *hard_iface;
  	int status_tmp = -1;
  	int ret = count;
  
  	hard_iface = batadv_hardif_get_by_netdev(net_dev);
  	if (!hard_iface)
  		return count;
  
  	if (buff[count - 1] == '
  ')
  		buff[count - 1] = '\0';
  
  	if (strlen(buff) >= IFNAMSIZ) {
  		pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'
  ",
  		       buff);
  		batadv_hardif_free_ref(hard_iface);
  		return -EINVAL;
  	}
  
  	if (strncmp(buff, "none", 4) == 0)
  		status_tmp = BATADV_IF_NOT_IN_USE;
  	else
  		status_tmp = BATADV_IF_I_WANT_YOU;
  
  	if (hard_iface->if_status == status_tmp)
  		goto out;
  
  	if ((hard_iface->soft_iface) &&
  	    (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
  		goto out;
  
  	rtnl_lock();
  
  	if (status_tmp == BATADV_IF_NOT_IN_USE) {
  		batadv_hardif_disable_interface(hard_iface,
  						BATADV_IF_CLEANUP_AUTO);
  		goto unlock;
  	}
  
  	/* if the interface already is in use */
  	if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
  		batadv_hardif_disable_interface(hard_iface,
  						BATADV_IF_CLEANUP_AUTO);
  
  	ret = batadv_hardif_enable_interface(hard_iface, buff);
  
  unlock:
  	rtnl_unlock();
  out:
  	batadv_hardif_free_ref(hard_iface);
  	return ret;
  }
  
  static ssize_t batadv_show_iface_status(struct kobject *kobj,
  					struct attribute *attr, char *buff)
  {
  	struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
  	struct batadv_hard_iface *hard_iface;
  	ssize_t length;
  
  	hard_iface = batadv_hardif_get_by_netdev(net_dev);
  	if (!hard_iface)
  		return 0;
  
  	switch (hard_iface->if_status) {
  	case BATADV_IF_TO_BE_REMOVED:
  		length = sprintf(buff, "disabling
  ");
  		break;
  	case BATADV_IF_INACTIVE:
  		length = sprintf(buff, "inactive
  ");
  		break;
  	case BATADV_IF_ACTIVE:
  		length = sprintf(buff, "active
  ");
  		break;
  	case BATADV_IF_TO_BE_ACTIVATED:
  		length = sprintf(buff, "enabling
  ");
  		break;
  	case BATADV_IF_NOT_IN_USE:
  	default:
  		length = sprintf(buff, "not in use
  ");
  		break;
  	}
  
  	batadv_hardif_free_ref(hard_iface);
  
  	return length;
  }
  
  static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
  		   batadv_store_mesh_iface);
  static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
  
  static struct batadv_attribute *batadv_batman_attrs[] = {
  	&batadv_attr_mesh_iface,
  	&batadv_attr_iface_status,
  	NULL,
  };
  
  int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
  {
  	struct kobject *hardif_kobject = &dev->dev.kobj;
  	struct batadv_attribute **bat_attr;
  	int err;
  
  	*hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
  					     hardif_kobject);
  
  	if (!*hardif_obj) {
  		batadv_err(dev, "Can't add sysfs directory: %s/%s
  ", dev->name,
  			   BATADV_SYSFS_IF_BAT_SUBDIR);
  		goto out;
  	}
  
  	for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
  		err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
  		if (err) {
  			batadv_err(dev, "Can't add sysfs file: %s/%s/%s
  ",
  				   dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
  				   ((*bat_attr)->attr).name);
  			goto rem_attr;
  		}
  	}
  
  	return 0;
  
  rem_attr:
  	for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
  		sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
  out:
  	return -ENOMEM;
  }
  
  void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
  {
  	kobject_put(*hardif_obj);
  	*hardif_obj = NULL;
  }
  
  int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
  			enum batadv_uev_action action, const char *data)
  {
  	int ret = -ENOMEM;
  	struct kobject *bat_kobj;
  	char *uevent_env[4] = { NULL, NULL, NULL, NULL };
  
  	bat_kobj = &bat_priv->soft_iface->dev.kobj;
  
  	uevent_env[0] = kmalloc(strlen(BATADV_UEV_TYPE_VAR) +
  				strlen(batadv_uev_type_str[type]) + 1,
  				GFP_ATOMIC);
  	if (!uevent_env[0])
  		goto out;
  
  	sprintf(uevent_env[0], "%s%s", BATADV_UEV_TYPE_VAR,
  		batadv_uev_type_str[type]);
  
  	uevent_env[1] = kmalloc(strlen(BATADV_UEV_ACTION_VAR) +
  				strlen(batadv_uev_action_str[action]) + 1,
  				GFP_ATOMIC);
  	if (!uevent_env[1])
  		goto out;
  
  	sprintf(uevent_env[1], "%s%s", BATADV_UEV_ACTION_VAR,
  		batadv_uev_action_str[action]);
  
  	/* If the event is DEL, ignore the data field */
  	if (action != BATADV_UEV_DEL) {
  		uevent_env[2] = kmalloc(strlen(BATADV_UEV_DATA_VAR) +
  					strlen(data) + 1, GFP_ATOMIC);
  		if (!uevent_env[2])
  			goto out;
  
  		sprintf(uevent_env[2], "%s%s", BATADV_UEV_DATA_VAR, data);
  	}
  
  	ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
  out:
  	kfree(uevent_env[0]);
  	kfree(uevent_env[1]);
  	kfree(uevent_env[2]);
  
  	if (ret)
  		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
  			   "Impossible to send uevent for (%s,%s,%s) event (err: %d)
  ",
  			   batadv_uev_type_str[type],
  			   batadv_uev_action_str[action],
  			   (action == BATADV_UEV_DEL ? "NULL" : data), ret);
  	return ret;
  }