/*
 * 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.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 "bonding.h"

#define to_dev(obj)     container_of(obj, struct device, kobj)
#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 = S_IWUSR | S_IRUGO,
        },
        .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;
        int ret;

        opt = bond_opt_get_by_name(attr->attr.name);
        if (WARN_ON(!opt))
                return -ENOENT;
        ret = bond_opt_tryset_rtnl(bond, opt->id, (char *)buffer);
        if (!ret)
                ret = count;

        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, S_IRUGO | S_IWUSR, 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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR, 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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   bonding_show_ad_select, bonding_sysfs_store_option);

/* Show and set 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 ssize_t bonding_store_num_peer_notif(struct device *d,
                                            struct device_attribute *attr,
                                            const char *buf, size_t count)
{
        struct bonding *bond = to_bond(d);
        int ret;

        ret = bond_opt_tryset_rtnl(bond, BOND_OPT_NUM_PEER_NOTIF, (char *)buf);
        if (!ret)
                ret = count;

        return ret;
}
static DEVICE_ATTR(num_grat_arp, S_IRUGO | S_IWUSR,
                   bonding_show_num_peer_notif, bonding_store_num_peer_notif);
static DEVICE_ATTR(num_unsol_na, S_IRUGO | S_IWUSR,
                   bonding_show_num_peer_notif, bonding_store_num_peer_notif);

/* 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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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 = !!rcu_access_pointer(bond->curr_active_slave);

        return sprintf(buf, "%s\n", active ? "up" : "down");
}
static DEVICE_ATTR(mii_status, S_IRUGO, 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, S_IRUGO, 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, S_IRUGO, 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) {
                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, S_IRUGO, 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) {
                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, S_IRUGO, 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) {
                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, S_IRUGO, 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, S_IRUGO | S_IWUSR, 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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   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, S_IRUGO | S_IWUSR,
                   bonding_show_packets_per_slave, 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,
        NULL,
};

static 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;
}