text: /*
   * Copyright(c) 2004-2005 Intel Corporation. All rights reserved.
   *
   * 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.
   *
   * 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/>.
   *
   * The full GNU General Public License is included in this distribution in the
   * file called LICENSE.
   *
   */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/device.h>
  #include <linux/sched/signal.h>
  #include <linux/fs.h>
  #include <linux/types.h>
  #include <linux/string.h>
  #include <linux/netdevice.h>
  #include <linux/inetdevice.h>
  #include <linux/in.h>
  #include <linux/sysfs.h>
  #include <linux/ctype.h>
  #include <linux/inet.h>
  #include <linux/rtnetlink.h>
  #include <linux/etherdevice.h>
  #include <net/net_namespace.h>
  #include <net/netns/generic.h>
  #include <linux/nsproxy.h>
  
  #include <net/bonding.h>
  
  #define to_bond(cd)	((struct bonding *)(netdev_priv(to_net_dev(cd))))
  
  /* "show" function for the bond_masters attribute.
   * The class parameter is ignored.
   */
  static ssize_t bonding_show_bonds(struct class *cls,
  				  struct class_attribute *attr,
  				  char *buf)
  {
  	struct bond_net *bn =
  		container_of(attr, struct bond_net, class_attr_bonding_masters);
  	int res = 0;
  	struct bonding *bond;
  
  	rtnl_lock();
  
  	list_for_each_entry(bond, &bn->dev_list, bond_list) {
  		if (res > (PAGE_SIZE - IFNAMSIZ)) {
  			/* not enough space for another interface name */
  			if ((PAGE_SIZE - res) > 10)
  				res = PAGE_SIZE - 10;
  			res += sprintf(buf + res, "++more++ ");
  			break;
  		}
  		res += sprintf(buf + res, "%s ", bond->dev->name);
  	}
  	if (res)
  		buf[res-1] = '\n'; /* eat the leftover space */
  
  	rtnl_unlock();
  	return res;
  }
  
  static struct net_device *bond_get_by_name(struct bond_net *bn, const char *ifname)
  {
  	struct bonding *bond;
  
  	list_for_each_entry(bond, &bn->dev_list, bond_list) {
  		if (strncmp(bond->dev->name, ifname, IFNAMSIZ) == 0)
  			return bond->dev;
  	}
  	return NULL;
  }
  
  /* "store" function for the bond_masters attribute.  This is what
   * creates and deletes entire bonds.
   *
   * The class parameter is ignored.
   */
  static ssize_t bonding_store_bonds(struct class *cls,
  				   struct class_attribute *attr,
  				   const char *buffer, size_t count)
  {
  	struct bond_net *bn =
  		container_of(attr, struct bond_net, class_attr_bonding_masters);
  	char command[IFNAMSIZ + 1] = {0, };
  	char *ifname;
  	int rv, res = count;
  
  	sscanf(buffer, "%16s", command); /* IFNAMSIZ*/
  	ifname = command + 1;
  	if ((strlen(command) <= 1) ||
  	    !dev_valid_name(ifname))
  		goto err_no_cmd;
  
  	if (command[0] == '+') {
  		pr_info("%s is being created...\n", ifname);
  		rv = bond_create(bn->net, ifname);
  		if (rv) {
  			if (rv == -EEXIST)
  				pr_info("%s already exists\n", ifname);
  			else
  				pr_info("%s creation failed\n", ifname);
  			res = rv;
  		}
  	} else if (command[0] == '-') {
  		struct net_device *bond_dev;
  
  		rtnl_lock();
  		bond_dev = bond_get_by_name(bn, ifname);
  		if (bond_dev) {
  			pr_info("%s is being deleted...\n", ifname);
  			unregister_netdevice(bond_dev);
  		} else {
  			pr_err("unable to delete non-existent %s\n", ifname);
  			res = -ENODEV;
  		}
  		rtnl_unlock();
  	} else
  		goto err_no_cmd;
  
  	/* Always return either count or an error.  If you return 0, you'll
  	 * get called forever, which is bad.
  	 */
  	return res;
  
  err_no_cmd:
  	pr_err("no command found in bonding_masters - use +ifname or -ifname\n");
  	return -EPERM;
  }
  
  /* class attribute for bond_masters file.  This ends up in /sys/class/net */
  static const struct class_attribute class_attr_bonding_masters = {
  	.attr = {
  		.name = "bonding_masters",
  		.mode = 0644,
  	},
  	.show = bonding_show_bonds,
  	.store = bonding_store_bonds,
  };
  
  /* Generic "store" method for bonding sysfs option setting */
  static ssize_t bonding_sysfs_store_option(struct device *d,
  					  struct device_attribute *attr,
  					  const char *buffer, size_t count)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_option *opt;
  	char *buffer_clone;
  	int ret;
  
  	opt = bond_opt_get_by_name(attr->attr.name);
  	if (WARN_ON(!opt))
  		return -ENOENT;
  	buffer_clone = kstrndup(buffer, count, GFP_KERNEL);
  	if (!buffer_clone)
  		return -ENOMEM;
  	ret = bond_opt_tryset_rtnl(bond, opt->id, buffer_clone);
  	if (!ret)
  		ret = count;
  	kfree(buffer_clone);
  
  	return ret;
  }
  
  /* Show the slaves in the current bond. */
  static ssize_t bonding_show_slaves(struct device *d,
  				   struct device_attribute *attr, char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	struct list_head *iter;
  	struct slave *slave;
  	int res = 0;
  
  	if (!rtnl_trylock())
  		return restart_syscall();
  
  	bond_for_each_slave(bond, slave, iter) {
  		if (res > (PAGE_SIZE - IFNAMSIZ)) {
  			/* not enough space for another interface name */
  			if ((PAGE_SIZE - res) > 10)
  				res = PAGE_SIZE - 10;
  			res += sprintf(buf + res, "++more++ ");
  			break;
  		}
  		res += sprintf(buf + res, "%s ", slave->dev->name);
  	}
  
  	rtnl_unlock();
  
  	if (res)
  		buf[res-1] = '\n'; /* eat the leftover space */
  
  	return res;
  }
  static DEVICE_ATTR(slaves, 0644, bonding_show_slaves,
  		   bonding_sysfs_store_option);
  
  /* Show the bonding mode. */
  static ssize_t bonding_show_mode(struct device *d,
  				 struct device_attribute *attr, char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_MODE, BOND_MODE(bond));
  
  	return sprintf(buf, "%s %d\n", val->string, BOND_MODE(bond));
  }
  static DEVICE_ATTR(mode, 0644, bonding_show_mode, bonding_sysfs_store_option);
  
  /* Show the bonding transmit hash method. */
  static ssize_t bonding_show_xmit_hash(struct device *d,
  				      struct device_attribute *attr,
  				      char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_XMIT_HASH, bond->params.xmit_policy);
  
  	return sprintf(buf, "%s %d\n", val->string, bond->params.xmit_policy);
  }
  static DEVICE_ATTR(xmit_hash_policy, 0644,
  		   bonding_show_xmit_hash, bonding_sysfs_store_option);
  
  /* Show arp_validate. */
  static ssize_t bonding_show_arp_validate(struct device *d,
  					 struct device_attribute *attr,
  					 char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_ARP_VALIDATE,
  			       bond->params.arp_validate);
  
  	return sprintf(buf, "%s %d\n", val->string, bond->params.arp_validate);
  }
  static DEVICE_ATTR(arp_validate, 0644, bonding_show_arp_validate,
  		   bonding_sysfs_store_option);
  
  /* Show arp_all_targets. */
  static ssize_t bonding_show_arp_all_targets(struct device *d,
  					 struct device_attribute *attr,
  					 char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_ARP_ALL_TARGETS,
  			       bond->params.arp_all_targets);
  	return sprintf(buf, "%s %d\n",
  		       val->string, bond->params.arp_all_targets);
  }
  static DEVICE_ATTR(arp_all_targets, 0644,
  		   bonding_show_arp_all_targets, bonding_sysfs_store_option);
  
  /* Show fail_over_mac. */
  static ssize_t bonding_show_fail_over_mac(struct device *d,
  					  struct device_attribute *attr,
  					  char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_FAIL_OVER_MAC,
  			       bond->params.fail_over_mac);
  
  	return sprintf(buf, "%s %d\n", val->string, bond->params.fail_over_mac);
  }
  static DEVICE_ATTR(fail_over_mac, 0644,
  		   bonding_show_fail_over_mac, bonding_sysfs_store_option);
  
  /* Show the arp timer interval. */
  static ssize_t bonding_show_arp_interval(struct device *d,
  					 struct device_attribute *attr,
  					 char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.arp_interval);
  }
  static DEVICE_ATTR(arp_interval, 0644,
  		   bonding_show_arp_interval, bonding_sysfs_store_option);
  
  /* Show the arp targets. */
  static ssize_t bonding_show_arp_targets(struct device *d,
  					struct device_attribute *attr,
  					char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	int i, res = 0;
  
  	for (i = 0; i < BOND_MAX_ARP_TARGETS; i++) {
  		if (bond->params.arp_targets[i])
  			res += sprintf(buf + res, "%pI4 ",
  				       &bond->params.arp_targets[i]);
  	}
  	if (res)
  		buf[res-1] = '\n'; /* eat the leftover space */
  
  	return res;
  }
  static DEVICE_ATTR(arp_ip_target, 0644,
  		   bonding_show_arp_targets, bonding_sysfs_store_option);
  
  /* Show the up and down delays. */
  static ssize_t bonding_show_downdelay(struct device *d,
  				      struct device_attribute *attr,
  				      char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.downdelay * bond->params.miimon);
  }
  static DEVICE_ATTR(downdelay, 0644,
  		   bonding_show_downdelay, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_updelay(struct device *d,
  				    struct device_attribute *attr,
  				    char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.updelay * bond->params.miimon);
  
  }
  static DEVICE_ATTR(updelay, 0644,
  		   bonding_show_updelay, bonding_sysfs_store_option);
  
  /* Show the LACP interval. */
  static ssize_t bonding_show_lacp(struct device *d,
  				 struct device_attribute *attr,
  				 char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_LACP_RATE, bond->params.lacp_fast);
  
  	return sprintf(buf, "%s %d\n", val->string, bond->params.lacp_fast);
  }
  static DEVICE_ATTR(lacp_rate, 0644,
  		   bonding_show_lacp, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_min_links(struct device *d,
  				      struct device_attribute *attr,
  				      char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%u\n", bond->params.min_links);
  }
  static DEVICE_ATTR(min_links, 0644,
  		   bonding_show_min_links, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_ad_select(struct device *d,
  				      struct device_attribute *attr,
  				      char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_AD_SELECT, bond->params.ad_select);
  
  	return sprintf(buf, "%s %d\n", val->string, bond->params.ad_select);
  }
  static DEVICE_ATTR(ad_select, 0644,
  		   bonding_show_ad_select, bonding_sysfs_store_option);
  
  /* Show the number of peer notifications to send after a failover event. */
  static ssize_t bonding_show_num_peer_notif(struct device *d,
  					   struct device_attribute *attr,
  					   char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	return sprintf(buf, "%d\n", bond->params.num_peer_notif);
  }
  static DEVICE_ATTR(num_grat_arp, 0644,
  		   bonding_show_num_peer_notif, bonding_sysfs_store_option);
  static DEVICE_ATTR(num_unsol_na, 0644,
  		   bonding_show_num_peer_notif, bonding_sysfs_store_option);
  
  /* Show the MII monitor interval. */
  static ssize_t bonding_show_miimon(struct device *d,
  				   struct device_attribute *attr,
  				   char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.miimon);
  }
  static DEVICE_ATTR(miimon, 0644,
  		   bonding_show_miimon, bonding_sysfs_store_option);
  
  /* Show the primary slave. */
  static ssize_t bonding_show_primary(struct device *d,
  				    struct device_attribute *attr,
  				    char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	struct slave *primary;
  	int count = 0;
  
  	rcu_read_lock();
  	primary = rcu_dereference(bond->primary_slave);
  	if (primary)
  		count = sprintf(buf, "%s\n", primary->dev->name);
  	rcu_read_unlock();
  
  	return count;
  }
  static DEVICE_ATTR(primary, 0644,
  		   bonding_show_primary, bonding_sysfs_store_option);
  
  /* Show the primary_reselect flag. */
  static ssize_t bonding_show_primary_reselect(struct device *d,
  					     struct device_attribute *attr,
  					     char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	const struct bond_opt_value *val;
  
  	val = bond_opt_get_val(BOND_OPT_PRIMARY_RESELECT,
  			       bond->params.primary_reselect);
  
  	return sprintf(buf, "%s %d\n",
  		       val->string, bond->params.primary_reselect);
  }
  static DEVICE_ATTR(primary_reselect, 0644,
  		   bonding_show_primary_reselect, bonding_sysfs_store_option);
  
  /* Show the use_carrier flag. */
  static ssize_t bonding_show_carrier(struct device *d,
  				    struct device_attribute *attr,
  				    char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.use_carrier);
  }
  static DEVICE_ATTR(use_carrier, 0644,
  		   bonding_show_carrier, bonding_sysfs_store_option);
  
  
  /* Show currently active_slave. */
  static ssize_t bonding_show_active_slave(struct device *d,
  					 struct device_attribute *attr,
  					 char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	struct net_device *slave_dev;
  	int count = 0;
  
  	rcu_read_lock();
  	slave_dev = bond_option_active_slave_get_rcu(bond);
  	if (slave_dev)
  		count = sprintf(buf, "%s\n", slave_dev->name);
  	rcu_read_unlock();
  
  	return count;
  }
  static DEVICE_ATTR(active_slave, 0644,
  		   bonding_show_active_slave, bonding_sysfs_store_option);
  
  /* Show link status of the bond interface. */
  static ssize_t bonding_show_mii_status(struct device *d,
  				       struct device_attribute *attr,
  				       char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	bool active = netif_carrier_ok(bond->dev);
  
  	return sprintf(buf, "%s\n", active ? "up" : "down");
  }
  static DEVICE_ATTR(mii_status, 0444, bonding_show_mii_status, NULL);
  
  /* Show current 802.3ad aggregator ID. */
  static ssize_t bonding_show_ad_aggregator(struct device *d,
  					  struct device_attribute *attr,
  					  char *buf)
  {
  	int count = 0;
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
  		struct ad_info ad_info;
  		count = sprintf(buf, "%d\n",
  				bond_3ad_get_active_agg_info(bond, &ad_info)
  				?  0 : ad_info.aggregator_id);
  	}
  
  	return count;
  }
  static DEVICE_ATTR(ad_aggregator, 0444, bonding_show_ad_aggregator, NULL);
  
  
  /* Show number of active 802.3ad ports. */
  static ssize_t bonding_show_ad_num_ports(struct device *d,
  					 struct device_attribute *attr,
  					 char *buf)
  {
  	int count = 0;
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD) {
  		struct ad_info ad_info;
  		count = sprintf(buf, "%d\n",
  				bond_3ad_get_active_agg_info(bond, &ad_info)
  				?  0 : ad_info.ports);
  	}
  
  	return count;
  }
  static DEVICE_ATTR(ad_num_ports, 0444, bonding_show_ad_num_ports, NULL);
  
  
  /* Show current 802.3ad actor key. */
  static ssize_t bonding_show_ad_actor_key(struct device *d,
  					 struct device_attribute *attr,
  					 char *buf)
  {
  	int count = 0;
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
  		struct ad_info ad_info;
  		count = sprintf(buf, "%d\n",
  				bond_3ad_get_active_agg_info(bond, &ad_info)
  				?  0 : ad_info.actor_key);
  	}
  
  	return count;
  }
  static DEVICE_ATTR(ad_actor_key, 0444, bonding_show_ad_actor_key, NULL);
  
  
  /* Show current 802.3ad partner key. */
  static ssize_t bonding_show_ad_partner_key(struct device *d,
  					   struct device_attribute *attr,
  					   char *buf)
  {
  	int count = 0;
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
  		struct ad_info ad_info;
  		count = sprintf(buf, "%d\n",
  				bond_3ad_get_active_agg_info(bond, &ad_info)
  				?  0 : ad_info.partner_key);
  	}
  
  	return count;
  }
  static DEVICE_ATTR(ad_partner_key, 0444, bonding_show_ad_partner_key, NULL);
  
  
  /* Show current 802.3ad partner mac. */
  static ssize_t bonding_show_ad_partner_mac(struct device *d,
  					   struct device_attribute *attr,
  					   char *buf)
  {
  	int count = 0;
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN)) {
  		struct ad_info ad_info;
  		if (!bond_3ad_get_active_agg_info(bond, &ad_info))
  			count = sprintf(buf, "%pM\n", ad_info.partner_system);
  	}
  
  	return count;
  }
  static DEVICE_ATTR(ad_partner_mac, 0444, bonding_show_ad_partner_mac, NULL);
  
  /* Show the queue_ids of the slaves in the current bond. */
  static ssize_t bonding_show_queue_id(struct device *d,
  				     struct device_attribute *attr,
  				     char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	struct list_head *iter;
  	struct slave *slave;
  	int res = 0;
  
  	if (!rtnl_trylock())
  		return restart_syscall();
  
  	bond_for_each_slave(bond, slave, iter) {
  		if (res > (PAGE_SIZE - IFNAMSIZ - 6)) {
  			/* not enough space for another interface_name:queue_id pair */
  			if ((PAGE_SIZE - res) > 10)
  				res = PAGE_SIZE - 10;
  			res += sprintf(buf + res, "++more++ ");
  			break;
  		}
  		res += sprintf(buf + res, "%s:%d ",
  			       slave->dev->name, slave->queue_id);
  	}
  	if (res)
  		buf[res-1] = '\n'; /* eat the leftover space */
  
  	rtnl_unlock();
  
  	return res;
  }
  static DEVICE_ATTR(queue_id, 0644, bonding_show_queue_id,
  		   bonding_sysfs_store_option);
  
  
  /* Show the all_slaves_active flag. */
  static ssize_t bonding_show_slaves_active(struct device *d,
  					  struct device_attribute *attr,
  					  char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.all_slaves_active);
  }
  static DEVICE_ATTR(all_slaves_active, 0644,
  		   bonding_show_slaves_active, bonding_sysfs_store_option);
  
  /* Show the number of IGMP membership reports to send on link failure */
  static ssize_t bonding_show_resend_igmp(struct device *d,
  					struct device_attribute *attr,
  					char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.resend_igmp);
  }
  static DEVICE_ATTR(resend_igmp, 0644,
  		   bonding_show_resend_igmp, bonding_sysfs_store_option);
  
  
  static ssize_t bonding_show_lp_interval(struct device *d,
  					struct device_attribute *attr,
  					char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	return sprintf(buf, "%d\n", bond->params.lp_interval);
  }
  static DEVICE_ATTR(lp_interval, 0644,
  		   bonding_show_lp_interval, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_tlb_dynamic_lb(struct device *d,
  					   struct device_attribute *attr,
  					   char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	return sprintf(buf, "%d\n", bond->params.tlb_dynamic_lb);
  }
  static DEVICE_ATTR(tlb_dynamic_lb, 0644,
  		   bonding_show_tlb_dynamic_lb, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_packets_per_slave(struct device *d,
  					      struct device_attribute *attr,
  					      char *buf)
  {
  	struct bonding *bond = to_bond(d);
  	unsigned int packets_per_slave = bond->params.packets_per_slave;
  
  	return sprintf(buf, "%u\n", packets_per_slave);
  }
  static DEVICE_ATTR(packets_per_slave, 0644,
  		   bonding_show_packets_per_slave, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_ad_actor_sys_prio(struct device *d,
  					      struct device_attribute *attr,
  					      char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
  		return sprintf(buf, "%hu\n", bond->params.ad_actor_sys_prio);
  
  	return 0;
  }
  static DEVICE_ATTR(ad_actor_sys_prio, 0644,
  		   bonding_show_ad_actor_sys_prio, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_ad_actor_system(struct device *d,
  					    struct device_attribute *attr,
  					    char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
  		return sprintf(buf, "%pM\n", bond->params.ad_actor_system);
  
  	return 0;
  }
  
  static DEVICE_ATTR(ad_actor_system, 0644,
  		   bonding_show_ad_actor_system, bonding_sysfs_store_option);
  
  static ssize_t bonding_show_ad_user_port_key(struct device *d,
  					     struct device_attribute *attr,
  					     char *buf)
  {
  	struct bonding *bond = to_bond(d);
  
  	if (BOND_MODE(bond) == BOND_MODE_8023AD && capable(CAP_NET_ADMIN))
  		return sprintf(buf, "%hu\n", bond->params.ad_user_port_key);
  
  	return 0;
  }
  static DEVICE_ATTR(ad_user_port_key, 0644,
  		   bonding_show_ad_user_port_key, bonding_sysfs_store_option);
  
  static struct attribute *per_bond_attrs[] = {
  	&dev_attr_slaves.attr,
  	&dev_attr_mode.attr,
  	&dev_attr_fail_over_mac.attr,
  	&dev_attr_arp_validate.attr,
  	&dev_attr_arp_all_targets.attr,
  	&dev_attr_arp_interval.attr,
  	&dev_attr_arp_ip_target.attr,
  	&dev_attr_downdelay.attr,
  	&dev_attr_updelay.attr,
  	&dev_attr_lacp_rate.attr,
  	&dev_attr_ad_select.attr,
  	&dev_attr_xmit_hash_policy.attr,
  	&dev_attr_num_grat_arp.attr,
  	&dev_attr_num_unsol_na.attr,
  	&dev_attr_miimon.attr,
  	&dev_attr_primary.attr,
  	&dev_attr_primary_reselect.attr,
  	&dev_attr_use_carrier.attr,
  	&dev_attr_active_slave.attr,
  	&dev_attr_mii_status.attr,
  	&dev_attr_ad_aggregator.attr,
  	&dev_attr_ad_num_ports.attr,
  	&dev_attr_ad_actor_key.attr,
  	&dev_attr_ad_partner_key.attr,
  	&dev_attr_ad_partner_mac.attr,
  	&dev_attr_queue_id.attr,
  	&dev_attr_all_slaves_active.attr,
  	&dev_attr_resend_igmp.attr,
  	&dev_attr_min_links.attr,
  	&dev_attr_lp_interval.attr,
  	&dev_attr_packets_per_slave.attr,
  	&dev_attr_tlb_dynamic_lb.attr,
  	&dev_attr_ad_actor_sys_prio.attr,
  	&dev_attr_ad_actor_system.attr,
  	&dev_attr_ad_user_port_key.attr,
  	NULL,
  };
  
  static const struct attribute_group bonding_group = {
  	.name = "bonding",
  	.attrs = per_bond_attrs,
  };
  
  /* Initialize sysfs.  This sets up the bonding_masters file in
   * /sys/class/net.
   */
  int bond_create_sysfs(struct bond_net *bn)
  {
  	int ret;
  
  	bn->class_attr_bonding_masters = class_attr_bonding_masters;
  	sysfs_attr_init(&bn->class_attr_bonding_masters.attr);
  
  	ret = netdev_class_create_file_ns(&bn->class_attr_bonding_masters,
  					  bn->net);
  	/* Permit multiple loads of the module by ignoring failures to
  	 * create the bonding_masters sysfs file.  Bonding devices
  	 * created by second or subsequent loads of the module will
  	 * not be listed in, or controllable by, bonding_masters, but
  	 * will have the usual "bonding" sysfs directory.
  	 *
  	 * This is done to preserve backwards compatibility for
  	 * initscripts/sysconfig, which load bonding multiple times to
  	 * configure multiple bonding devices.
  	 */
  	if (ret == -EEXIST) {
  		/* Is someone being kinky and naming a device bonding_master? */
  		if (__dev_get_by_name(bn->net,
  				      class_attr_bonding_masters.attr.name))
  			pr_err("network device named %s already exists in sysfs\n",
  			       class_attr_bonding_masters.attr.name);
  		ret = 0;
  	}
  
  	return ret;
  
  }
  
  /* Remove /sys/class/net/bonding_masters. */
  void bond_destroy_sysfs(struct bond_net *bn)
  {
  	netdev_class_remove_file_ns(&bn->class_attr_bonding_masters, bn->net);
  }
  
  /* Initialize sysfs for each bond.  This sets up and registers
   * the 'bondctl' directory for each individual bond under /sys/class/net.
   */
  void bond_prepare_sysfs_group(struct bonding *bond)
  {
  	bond->dev->sysfs_groups[0] = &bonding_group;
  }
  
  