sysfs.c

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/* Copyright (C) 2010-2012 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#include "main.h"
#include "sysfs.h"
#include "translation-table.h"
#include "originator.h"
#include "hard-interface.h"
#include "gateway_common.h"
#include "gateway_client.h"
#include "vis.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);
}

#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 */
#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\n",                    \
               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\n", 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_HIF_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_hard_iface *hard_iface;               \
    ssize_t length;                         \
                                    \
    hard_iface = batadv_hardif_get_by_netdev(net_dev);      \
    if (!hard_iface)                        \
        return 0;                       \
                                    \
    length = __batadv_store_uint_attr(buff, count, _min, _max,  \
                      _post_func, attr,     \
                      &hard_iface->_name, net_dev); \
                                    \
    batadv_hardif_free_ref(hard_iface);             \
    return length;                          \
}

#define BATADV_ATTR_HIF_SHOW_UINT(_name)                \
ssize_t batadv_show_##_name(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;                       \
                                    \
    length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_name));\
                                    \
    batadv_hardif_free_ref(hard_iface);             \
    return length;                          \
}

/* Use this, if you are going to set [name] in hard_iface to an
 * unsigned integer value
 */
#define BATADV_ATTR_HIF_UINT(_name, _mode, _min, _max, _post_func)  \
    static BATADV_ATTR_HIF_STORE_UINT(_name, _min, _max, _post_func)\
    static BATADV_ATTR_HIF_SHOW_UINT(_name)             \
    static BATADV_ATTR(_name, _mode, batadv_show_##_name,       \
               batadv_store_##_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] == '\n')
        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\n",
                attr_name, buff);
        return -EINVAL;
    }

    if (atomic_read(attr) == enabled)
        return count;

    batadv_info(net_dev, "%s: Changing from: %s to: %s\n", 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\n",
                attr_name, buff);
        return -EINVAL;
    }

    if (uint_val < min) {
        batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
                attr_name, uint_val, min);
        return -EINVAL;
    }

    if (uint_val > max) {
        batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
                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\n",
            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_vis_mode(struct kobject *kobj,
                    struct attribute *attr, char *buff)
{
    struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
    int vis_mode = atomic_read(&bat_priv->vis_mode);
    const char *mode;

    if (vis_mode == BATADV_VIS_TYPE_CLIENT_UPDATE)
        mode = "client";
    else
        mode = "server";

    return sprintf(buff, "%s\n", mode);
}

static ssize_t batadv_store_vis_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);
    unsigned long val;
    int ret, vis_mode_tmp = -1;
    const char *old_mode, *new_mode;

    ret = kstrtoul(buff, 10, &val);

    if (((count == 2) && (!ret) &&
         (val == BATADV_VIS_TYPE_CLIENT_UPDATE)) ||
        (strncmp(buff, "client", 6) == 0) ||
        (strncmp(buff, "off", 3) == 0))
        vis_mode_tmp = BATADV_VIS_TYPE_CLIENT_UPDATE;

    if (((count == 2) && (!ret) &&
         (val == BATADV_VIS_TYPE_SERVER_SYNC)) ||
        (strncmp(buff, "server", 6) == 0))
        vis_mode_tmp = BATADV_VIS_TYPE_SERVER_SYNC;

    if (vis_mode_tmp < 0) {
        if (buff[count - 1] == '\n')
            buff[count - 1] = '\0';

        batadv_info(net_dev,
                "Invalid parameter for 'vis mode' setting received: %s\n",
                buff);
        return -EINVAL;
    }

    if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp)
        return count;

    if (atomic_read(&bat_priv->vis_mode) == BATADV_VIS_TYPE_CLIENT_UPDATE)
        old_mode =  "client";
    else
        old_mode = "server";

    if (vis_mode_tmp == BATADV_VIS_TYPE_CLIENT_UPDATE)
        new_mode =  "client";
    else
        new_mode = "server";

    batadv_info(net_dev, "Changing vis mode from: %s to: %s\n", old_mode,
            new_mode);

    atomic_set(&bat_priv->vis_mode, (unsigned int)vis_mode_tmp);
    return count;
}

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\n", bat_priv->bat_algo_ops->name);
}

static void batadv_post_gw_deselect(struct net_device *net_dev)
{
    struct batadv_priv *bat_priv = netdev_priv(net_dev);
    batadv_gw_deselect(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\n",
                    BATADV_GW_MODE_CLIENT_NAME);
        break;
    case BATADV_GW_MODE_SERVER:
        bytes_written = sprintf(buff, "%s\n",
                    BATADV_GW_MODE_SERVER_NAME);
        break;
    default:
        bytes_written = sprintf(buff, "%s\n",
                    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] == '\n')
        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\n",
                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\n",
            curr_gw_mode_str, buff);

    batadv_gw_deselect(bat_priv);
    atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp);
    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);
    int down, up;
    int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);

    batadv_gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
    return sprintf(buff, "%i%s/%i%s\n",
               (down > 2048 ? down / 1024 : down),
               (down > 2048 ? "MBit" : "KBit"),
               (up > 2048 ? up / 1024 : up),
               (up > 2048 ? "MBit" : "KBit"));
}

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] == '\n')
        buff[count - 1] = '\0';

    return batadv_gw_bandwidth_set(net_dev, buff, 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
BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
BATADV_ATTR_SIF_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
static BATADV_ATTR(vis_mode, S_IRUGO | S_IWUSR, batadv_show_vis_mode,
           batadv_store_vis_mode);
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_deselect);
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

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
    &batadv_attr_fragmentation,
    &batadv_attr_ap_isolation,
    &batadv_attr_vis_mode,
    &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
    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\n", 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\n",
                   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;
}

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\n", 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] == '\n')
        buff[count - 1] = '\0';

    if (strlen(buff) >= IFNAMSIZ) {
        pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
               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;

    if (!rtnl_trylock()) {
        ret = -ERESTARTSYS;
        goto out;
    }

    if (status_tmp == BATADV_IF_NOT_IN_USE) {
        batadv_hardif_disable_interface(hard_iface);
        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);

    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\n");
        break;
    case BATADV_IF_INACTIVE:
        length = sprintf(buff, "inactive\n");
        break;
    case BATADV_IF_ACTIVE:
        length = sprintf(buff, "active\n");
        break;
    case BATADV_IF_TO_BE_ACTIVATED:
        length = sprintf(buff, "enabling\n");
        break;
    case BATADV_IF_NOT_IN_USE:
    default:
        length = sprintf(buff, "not in use\n");
        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\n", 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\n",
                   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 batadv_hard_iface *primary_if = NULL;
    struct kobject *bat_kobj;
    char *uevent_env[4] = { NULL, NULL, NULL, NULL };

    primary_if = batadv_primary_if_get_selected(bat_priv);
    if (!primary_if)
        goto out;

    bat_kobj = &primary_if->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 (primary_if)
        batadv_hardif_free_ref(primary_if);

    if (ret)
        batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
               "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
               batadv_uev_type_str[type],
               batadv_uev_action_str[action],
               (action == BATADV_UEV_DEL ? "NULL" : data), ret);
    return ret;
}