net/batman-adv/sysfs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2010-2018  B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "sysfs.h"
  20 #include "main.h"
  21
  22 #include <linux/atomic.h>
  23 #include <linux/compiler.h>
  24 #include <linux/device.h>
  25 #include <linux/errno.h>
  26 #include <linux/gfp.h>
  27 #include <linux/if.h>
  28 #include <linux/if_vlan.h>
  29 #include <linux/kernel.h>
  30 #include <linux/kobject.h>
  31 #include <linux/kref.h>
  32 #include <linux/netdevice.h>
  33 #include <linux/printk.h>
  34 #include <linux/rculist.h>
  35 #include <linux/rcupdate.h>
  36 #include <linux/rtnetlink.h>
  37 #include <linux/slab.h>
  38 #include <linux/stddef.h>
  39 #include <linux/string.h>
  40 #include <linux/stringify.h>
  41 #include <linux/workqueue.h>
  42 #include <uapi/linux/batadv_packet.h>
  43
  44 #include "bridge_loop_avoidance.h"
  45 #include "distributed-arp-table.h"
  46 #include "gateway_client.h"
  47 #include "gateway_common.h"
  48 #include "hard-interface.h"
  49 #include "log.h"
  50 #include "network-coding.h"
  51 #include "soft-interface.h"
  52
  53 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  54 {
  55         struct device *dev = container_of(obj->parent, struct device, kobj);
  56
  57         return to_net_dev(dev);
  58 }
  59
  60 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  61 {
  62         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  63
  64         return netdev_priv(net_dev);
  65 }
  66
  67 /**
  68  * batadv_vlan_kobj_to_batpriv() - convert a vlan kobj in the associated batpriv
  69  * @obj: kobject to covert
  70  *
  71  * Return: the associated batadv_priv struct.
  72  */
  73 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  74 {
  75         /* VLAN specific attributes are located in the root sysfs folder if they
  76          * refer to the untagged VLAN..
  77          */
  78         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  79                 return batadv_kobj_to_batpriv(obj);
  80
  81         /* ..while the attributes for the tagged vlans are located in
  82          * the in the corresponding "vlan%VID" subfolder
  83          */
  84         return batadv_kobj_to_batpriv(obj->parent);
  85 }
  86
  87 /**
  88  * batadv_kobj_to_vlan() - convert a kobj in the associated softif_vlan struct
  89  * @bat_priv: the bat priv with all the soft interface information
  90  * @obj: kobject to covert
  91  *
  92  * Return: the associated softif_vlan struct if found, NULL otherwise.
  93  */
  94 static struct batadv_softif_vlan *
  95 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  96 {
  97         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
  98
  99         rcu_read_lock();
 100         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 101                 if (vlan_tmp->kobj != obj)
 102                         continue;
 103
 104                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
 105                         continue;
 106
 107                 vlan = vlan_tmp;
 108                 break;
 109         }
 110         rcu_read_unlock();
 111
 112         return vlan;
 113 }
 114
 115 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
 116 #define BATADV_UEV_ACTION_VAR   "BATACTION="
 117 #define BATADV_UEV_DATA_VAR     "BATDATA="
 118
 119 static char *batadv_uev_action_str[] = {
 120         "add",
 121         "del",
 122         "change",
 123         "loopdetect",
 124 };
 125
 126 static char *batadv_uev_type_str[] = {
 127         "gw",
 128         "bla",
 129 };
 130
 131 /* Use this, if you have customized show and store functions for vlan attrs */
 132 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
 133 struct batadv_attribute batadv_attr_vlan_##_name = {    \
 134         .attr = {.name = __stringify(_name),            \
 135                  .mode = _mode },                       \
 136         .show   = _show,                                \
 137         .store  = _store,                               \
 138 }
 139
 140 /* Use this, if you have customized show and store functions */
 141 #define BATADV_ATTR(_name, _mode, _show, _store)        \
 142 struct batadv_attribute batadv_attr_##_name = {         \
 143         .attr = {.name = __stringify(_name),            \
 144                  .mode = _mode },                       \
 145         .show   = _show,                                \
 146         .store  = _store,                               \
 147 }
 148
 149 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
 150 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 151                              struct attribute *attr, char *buff,        \
 152                              size_t count)                              \
 153 {                                                                       \
 154         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 155         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 156                                                                         \
 157         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
 158                                         &bat_priv->_name, net_dev);     \
 159 }
 160
 161 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
 162 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 163                             struct attribute *attr, char *buff)         \
 164 {                                                                       \
 165         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 166                                                                         \
 167         return sprintf(buff, "%s\n",                                    \
 168                        atomic_read(&bat_priv->_name) == 0 ?             \
 169                        "disabled" : "enabled");                         \
 170 }                                                                       \
 171
 172 /* Use this, if you are going to turn a [name] in the soft-interface
 173  * (bat_priv) on or off
 174  */
 175 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
 176         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
 177         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
 178         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 179                            batadv_store_##_name)
 180
 181 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 182 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 183                              struct attribute *attr, char *buff,        \
 184                              size_t count)                              \
 185 {                                                                       \
 186         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 187         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 188                                                                         \
 189         return __batadv_store_uint_attr(buff, count, _min, _max,        \
 190                                         _post_func, attr,               \
 191                                         &bat_priv->_var, net_dev);      \
 192 }
 193
 194 #define BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                          \
 195 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 196                             struct attribute *attr, char *buff)         \
 197 {                                                                       \
 198         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 199                                                                         \
 200         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var));     \
 201 }                                                                       \
 202
 203 /* Use this, if you are going to set [name] in the soft-interface
 204  * (bat_priv) to an unsigned integer value
 205  */
 206 #define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 207         static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
 208         static BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                   \
 209         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 210                            batadv_store_##_name)
 211
 212 #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)                  \
 213 ssize_t batadv_store_vlan_##_name(struct kobject *kobj,                 \
 214                                   struct attribute *attr, char *buff,   \
 215                                   size_t count)                         \
 216 {                                                                       \
 217         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 218         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 219                                                               kobj);    \
 220         size_t res = __batadv_store_bool_attr(buff, count, _post_func,  \
 221                                               attr, &vlan->_name,       \
 222                                               bat_priv->soft_iface);    \
 223                                                                         \
 224         batadv_softif_vlan_put(vlan);                                   \
 225         return res;                                                     \
 226 }
 227
 228 #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)                               \
 229 ssize_t batadv_show_vlan_##_name(struct kobject *kobj,                  \
 230                                  struct attribute *attr, char *buff)    \
 231 {                                                                       \
 232         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 233         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 234                                                               kobj);    \
 235         size_t res = sprintf(buff, "%s\n",                              \
 236                              atomic_read(&vlan->_name) == 0 ?           \
 237                              "disabled" : "enabled");                   \
 238                                                                         \
 239         batadv_softif_vlan_put(vlan);                                   \
 240         return res;                                                     \
 241 }
 242
 243 /* Use this, if you are going to turn a [name] in the vlan struct on or off */
 244 #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)                 \
 245         static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)           \
 246         static BATADV_ATTR_VLAN_SHOW_BOOL(_name)                        \
 247         static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
 248                                 batadv_store_vlan_##_name)
 249
 250 #define BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 251 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 252                              struct attribute *attr, char *buff,        \
 253                              size_t count)                              \
 254 {                                                                       \
 255         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 256         struct batadv_hard_iface *hard_iface;                           \
 257         ssize_t length;                                                 \
 258                                                                         \
 259         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 260         if (!hard_iface)                                                \
 261                 return 0;                                               \
 262                                                                         \
 263         length = __batadv_store_uint_attr(buff, count, _min, _max,      \
 264                                           _post_func, attr,             \
 265                                           &hard_iface->_var, net_dev);  \
 266                                                                         \
 267         batadv_hardif_put(hard_iface);                          \
 268         return length;                                                  \
 269 }
 270
 271 #define BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                          \
 272 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 273                             struct attribute *attr, char *buff)         \
 274 {                                                                       \
 275         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 276         struct batadv_hard_iface *hard_iface;                           \
 277         ssize_t length;                                                 \
 278                                                                         \
 279         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 280         if (!hard_iface)                                                \
 281                 return 0;                                               \
 282                                                                         \
 283         length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \
 284                                                                         \
 285         batadv_hardif_put(hard_iface);                          \
 286         return length;                                                  \
 287 }
 288
 289 /* Use this, if you are going to set [name] in hard_iface to an
 290  * unsigned integer value
 291  */
 292 #define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 293         static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min,            \
 294                                           _max, _post_func)             \
 295         static BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                   \
 296         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 297                            batadv_store_##_name)
 298
 299 static int batadv_store_bool_attr(char *buff, size_t count,
 300                                   struct net_device *net_dev,
 301                                   const char *attr_name, atomic_t *attr,
 302                                   bool *changed)
 303 {
 304         int enabled = -1;
 305
 306         *changed = false;
 307
 308         if (buff[count - 1] == '\n')
 309                 buff[count - 1] = '\0';
 310
 311         if ((strncmp(buff, "1", 2) == 0) ||
 312             (strncmp(buff, "enable", 7) == 0) ||
 313             (strncmp(buff, "enabled", 8) == 0))
 314                 enabled = 1;
 315
 316         if ((strncmp(buff, "0", 2) == 0) ||
 317             (strncmp(buff, "disable", 8) == 0) ||
 318             (strncmp(buff, "disabled", 9) == 0))
 319                 enabled = 0;
 320
 321         if (enabled < 0) {
 322                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 323                             attr_name, buff);
 324                 return -EINVAL;
 325         }
 326
 327         if (atomic_read(attr) == enabled)
 328                 return count;
 329
 330         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 331                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 332                     enabled == 1 ? "enabled" : "disabled");
 333
 334         *changed = true;
 335
 336         atomic_set(attr, (unsigned int)enabled);
 337         return count;
 338 }
 339
 340 static inline ssize_t
 341 __batadv_store_bool_attr(char *buff, size_t count,
 342                          void (*post_func)(struct net_device *),
 343                          struct attribute *attr,
 344                          atomic_t *attr_store, struct net_device *net_dev)
 345 {
 346         bool changed;
 347         int ret;
 348
 349         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 350                                      attr_store, &changed);
 351         if (post_func && changed)
 352                 post_func(net_dev);
 353
 354         return ret;
 355 }
 356
 357 static int batadv_store_uint_attr(const char *buff, size_t count,
 358                                   struct net_device *net_dev,
 359                                   const char *attr_name,
 360                                   unsigned int min, unsigned int max,
 361                                   atomic_t *attr)
 362 {
 363         unsigned long uint_val;
 364         int ret;
 365
 366         ret = kstrtoul(buff, 10, &uint_val);
 367         if (ret) {
 368                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 369                             attr_name, buff);
 370                 return -EINVAL;
 371         }
 372
 373         if (uint_val < min) {
 374                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 375                             attr_name, uint_val, min);
 376                 return -EINVAL;
 377         }
 378
 379         if (uint_val > max) {
 380                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 381                             attr_name, uint_val, max);
 382                 return -EINVAL;
 383         }
 384
 385         if (atomic_read(attr) == uint_val)
 386                 return count;
 387
 388         batadv_info(net_dev, "%s: Changing from: %i to: %lu\n",
 389                     attr_name, atomic_read(attr), uint_val);
 390
 391         atomic_set(attr, uint_val);
 392         return count;
 393 }
 394
 395 static ssize_t __batadv_store_uint_attr(const char *buff, size_t count,
 396                                         int min, int max,
 397                                         void (*post_func)(struct net_device *),
 398                                         const struct attribute *attr,
 399                                         atomic_t *attr_store,
 400                                         struct net_device *net_dev)
 401 {
 402         int ret;
 403
 404         ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
 405                                      attr_store);
 406         if (post_func && ret)
 407                 post_func(net_dev);
 408
 409         return ret;
 410 }
 411
 412 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 413                                     struct attribute *attr, char *buff)
 414 {
 415         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 416
 417         return sprintf(buff, "%s\n", bat_priv->algo_ops->name);
 418 }
 419
 420 static void batadv_post_gw_reselect(struct net_device *net_dev)
 421 {
 422         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 423
 424         batadv_gw_reselect(bat_priv);
 425 }
 426
 427 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 428                                    char *buff)
 429 {
 430         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 431         int bytes_written;
 432
 433         /* GW mode is not available if the routing algorithm in use does not
 434          * implement the GW API
 435          */
 436         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 437             !bat_priv->algo_ops->gw.is_eligible)
 438                 return -ENOENT;
 439
 440         switch (atomic_read(&bat_priv->gw.mode)) {
 441         case BATADV_GW_MODE_CLIENT:
 442                 bytes_written = sprintf(buff, "%s\n",
 443                                         BATADV_GW_MODE_CLIENT_NAME);
 444                 break;
 445         case BATADV_GW_MODE_SERVER:
 446                 bytes_written = sprintf(buff, "%s\n",
 447                                         BATADV_GW_MODE_SERVER_NAME);
 448                 break;
 449         default:
 450                 bytes_written = sprintf(buff, "%s\n",
 451                                         BATADV_GW_MODE_OFF_NAME);
 452                 break;
 453         }
 454
 455         return bytes_written;
 456 }
 457
 458 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 459                                     struct attribute *attr, char *buff,
 460                                     size_t count)
 461 {
 462         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 463         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 464         char *curr_gw_mode_str;
 465         int gw_mode_tmp = -1;
 466
 467         /* toggling GW mode is allowed only if the routing algorithm in use
 468          * provides the GW API
 469          */
 470         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 471             !bat_priv->algo_ops->gw.is_eligible)
 472                 return -EINVAL;
 473
 474         if (buff[count - 1] == '\n')
 475                 buff[count - 1] = '\0';
 476
 477         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 478                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 479                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 480
 481         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 482                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 483                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 484
 485         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 486                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 487                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 488
 489         if (gw_mode_tmp < 0) {
 490                 batadv_info(net_dev,
 491                             "Invalid parameter for 'gw mode' setting received: %s\n",
 492                             buff);
 493                 return -EINVAL;
 494         }
 495
 496         if (atomic_read(&bat_priv->gw.mode) == gw_mode_tmp)
 497                 return count;
 498
 499         switch (atomic_read(&bat_priv->gw.mode)) {
 500         case BATADV_GW_MODE_CLIENT:
 501                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 502                 break;
 503         case BATADV_GW_MODE_SERVER:
 504                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 505                 break;
 506         default:
 507                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 508                 break;
 509         }
 510
 511         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 512                     curr_gw_mode_str, buff);
 513
 514         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 515          * current GW. It will only instruct the gateway client code to perform
 516          * a re-election the next time that this is needed.
 517          *
 518          * When gw client mode is being switched off the current GW must be
 519          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 520          * client mode re-activation. This is operation is performed in
 521          * batadv_gw_check_client_stop().
 522          */
 523         batadv_gw_reselect(bat_priv);
 524         /* always call batadv_gw_check_client_stop() before changing the gateway
 525          * state
 526          */
 527         batadv_gw_check_client_stop(bat_priv);
 528         atomic_set(&bat_priv->gw.mode, (unsigned int)gw_mode_tmp);
 529         batadv_gw_tvlv_container_update(bat_priv);
 530         return count;
 531 }
 532
 533 static ssize_t batadv_show_gw_sel_class(struct kobject *kobj,
 534                                         struct attribute *attr, char *buff)
 535 {
 536         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 537
 538         /* GW selection class is not available if the routing algorithm in use
 539          * does not implement the GW API
 540          */
 541         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 542             !bat_priv->algo_ops->gw.is_eligible)
 543                 return -ENOENT;
 544
 545         if (bat_priv->algo_ops->gw.show_sel_class)
 546                 return bat_priv->algo_ops->gw.show_sel_class(bat_priv, buff);
 547
 548         return sprintf(buff, "%i\n", atomic_read(&bat_priv->gw.sel_class));
 549 }
 550
 551 static ssize_t batadv_store_gw_sel_class(struct kobject *kobj,
 552                                          struct attribute *attr, char *buff,
 553                                          size_t count)
 554 {
 555         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 556
 557         /* setting the GW selection class is allowed only if the routing
 558          * algorithm in use implements the GW API
 559          */
 560         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 561             !bat_priv->algo_ops->gw.is_eligible)
 562                 return -EINVAL;
 563
 564         if (buff[count - 1] == '\n')
 565                 buff[count - 1] = '\0';
 566
 567         if (bat_priv->algo_ops->gw.store_sel_class)
 568                 return bat_priv->algo_ops->gw.store_sel_class(bat_priv, buff,
 569                                                               count);
 570
 571         return __batadv_store_uint_attr(buff, count, 1, BATADV_TQ_MAX_VALUE,
 572                                         batadv_post_gw_reselect, attr,
 573                                         &bat_priv->gw.sel_class,
 574                                         bat_priv->soft_iface);
 575 }
 576
 577 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 578                                      struct attribute *attr, char *buff)
 579 {
 580         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 581         u32 down, up;
 582
 583         down = atomic_read(&bat_priv->gw.bandwidth_down);
 584         up = atomic_read(&bat_priv->gw.bandwidth_up);
 585
 586         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 587                        down % 10, up / 10, up % 10);
 588 }
 589
 590 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 591                                       struct attribute *attr, char *buff,
 592                                       size_t count)
 593 {
 594         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 595
 596         if (buff[count - 1] == '\n')
 597                 buff[count - 1] = '\0';
 598
 599         return batadv_gw_bandwidth_set(net_dev, buff, count);
 600 }
 601
 602 /**
 603  * batadv_show_isolation_mark() - print the current isolation mark/mask
 604  * @kobj: kobject representing the private mesh sysfs directory
 605  * @attr: the batman-adv attribute the user is interacting with
 606  * @buff: the buffer that will contain the data to send back to the user
 607  *
 608  * Return: the number of bytes written into 'buff' on success or a negative
 609  * error code in case of failure
 610  */
 611 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 612                                           struct attribute *attr, char *buff)
 613 {
 614         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 615
 616         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 617                        bat_priv->isolation_mark_mask);
 618 }
 619
 620 /**
 621  * batadv_store_isolation_mark() - parse and store the isolation mark/mask
 622  *  entered by the user
 623  * @kobj: kobject representing the private mesh sysfs directory
 624  * @attr: the batman-adv attribute the user is interacting with
 625  * @buff: the buffer containing the user data
 626  * @count: number of bytes in the buffer
 627  *
 628  * Return: 'count' on success or a negative error code in case of failure
 629  */
 630 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 631                                            struct attribute *attr, char *buff,
 632                                            size_t count)
 633 {
 634         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 635         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 636         u32 mark, mask;
 637         char *mask_ptr;
 638
 639         /* parse the mask if it has been specified, otherwise assume the mask is
 640          * the biggest possible
 641          */
 642         mask = 0xFFFFFFFF;
 643         mask_ptr = strchr(buff, '/');
 644         if (mask_ptr) {
 645                 *mask_ptr = '\0';
 646                 mask_ptr++;
 647
 648                 /* the mask must be entered in hex base as it is going to be a
 649                  * bitmask and not a prefix length
 650                  */
 651                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 652                         return -EINVAL;
 653         }
 654
 655         /* the mark can be entered in any base */
 656         if (kstrtou32(buff, 0, &mark) < 0)
 657                 return -EINVAL;
 658
 659         bat_priv->isolation_mark_mask = mask;
 660         /* erase bits not covered by the mask */
 661         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 662
 663         batadv_info(net_dev,
 664                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 665                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 666
 667         return count;
 668 }
 669
 670 BATADV_ATTR_SIF_BOOL(aggregated_ogms, 0644, NULL);
 671 BATADV_ATTR_SIF_BOOL(bonding, 0644, NULL);
 672 #ifdef CONFIG_BATMAN_ADV_BLA
 673 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, 0644, batadv_bla_status_update);
 674 #endif
 675 #ifdef CONFIG_BATMAN_ADV_DAT
 676 BATADV_ATTR_SIF_BOOL(distributed_arp_table, 0644, batadv_dat_status_update);
 677 #endif
 678 BATADV_ATTR_SIF_BOOL(fragmentation, 0644, batadv_update_min_mtu);
 679 static BATADV_ATTR(routing_algo, 0444, batadv_show_bat_algo, NULL);
 680 static BATADV_ATTR(gw_mode, 0644, batadv_show_gw_mode, batadv_store_gw_mode);
 681 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, 0644, 2 * BATADV_JITTER,
 682                      INT_MAX, NULL);
 683 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, 0644, 0, BATADV_TQ_MAX_VALUE,
 684                      NULL);
 685 static BATADV_ATTR(gw_sel_class, 0644, batadv_show_gw_sel_class,
 686                    batadv_store_gw_sel_class);
 687 static BATADV_ATTR(gw_bandwidth, 0644, batadv_show_gw_bwidth,
 688                    batadv_store_gw_bwidth);
 689 #ifdef CONFIG_BATMAN_ADV_MCAST
 690 BATADV_ATTR_SIF_BOOL(multicast_mode, 0644, NULL);
 691 #endif
 692 #ifdef CONFIG_BATMAN_ADV_DEBUG
 693 BATADV_ATTR_SIF_UINT(log_level, log_level, 0644, 0, BATADV_DBG_ALL, NULL);
 694 #endif
 695 #ifdef CONFIG_BATMAN_ADV_NC
 696 BATADV_ATTR_SIF_BOOL(network_coding, 0644, batadv_nc_status_update);
 697 #endif
 698 static BATADV_ATTR(isolation_mark, 0644, batadv_show_isolation_mark,
 699                    batadv_store_isolation_mark);
 700
 701 static struct batadv_attribute *batadv_mesh_attrs[] = {
 702         &batadv_attr_aggregated_ogms,
 703         &batadv_attr_bonding,
 704 #ifdef CONFIG_BATMAN_ADV_BLA
 705         &batadv_attr_bridge_loop_avoidance,
 706 #endif
 707 #ifdef CONFIG_BATMAN_ADV_DAT
 708         &batadv_attr_distributed_arp_table,
 709 #endif
 710 #ifdef CONFIG_BATMAN_ADV_MCAST
 711         &batadv_attr_multicast_mode,
 712 #endif
 713         &batadv_attr_fragmentation,
 714         &batadv_attr_routing_algo,
 715         &batadv_attr_gw_mode,
 716         &batadv_attr_orig_interval,
 717         &batadv_attr_hop_penalty,
 718         &batadv_attr_gw_sel_class,
 719         &batadv_attr_gw_bandwidth,
 720 #ifdef CONFIG_BATMAN_ADV_DEBUG
 721         &batadv_attr_log_level,
 722 #endif
 723 #ifdef CONFIG_BATMAN_ADV_NC
 724         &batadv_attr_network_coding,
 725 #endif
 726         &batadv_attr_isolation_mark,
 727         NULL,
 728 };
 729
 730 BATADV_ATTR_VLAN_BOOL(ap_isolation, 0644, NULL);
 731
 732 /* array of vlan specific sysfs attributes */
 733 static struct batadv_attribute *batadv_vlan_attrs[] = {
 734         &batadv_attr_vlan_ap_isolation,
 735         NULL,
 736 };
 737
 738 /**
 739  * batadv_sysfs_add_meshif() - Add soft interface specific sysfs entries
 740  * @dev: netdev struct of the soft interface
 741  *
 742  * Return: 0 on success or negative error number in case of failure
 743  */
 744 int batadv_sysfs_add_meshif(struct net_device *dev)
 745 {
 746         struct kobject *batif_kobject = &dev->dev.kobj;
 747         struct batadv_priv *bat_priv = netdev_priv(dev);
 748         struct batadv_attribute **bat_attr;
 749         int err;
 750
 751         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 752                                                     batif_kobject);
 753         if (!bat_priv->mesh_obj) {
 754                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 755                            BATADV_SYSFS_IF_MESH_SUBDIR);
 756                 goto out;
 757         }
 758
 759         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 760                 err = sysfs_create_file(bat_priv->mesh_obj,
 761                                         &((*bat_attr)->attr));
 762                 if (err) {
 763                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 764                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 765                                    ((*bat_attr)->attr).name);
 766                         goto rem_attr;
 767                 }
 768         }
 769
 770         return 0;
 771
 772 rem_attr:
 773         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 774                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 775
 776         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 777         kobject_del(bat_priv->mesh_obj);
 778         kobject_put(bat_priv->mesh_obj);
 779         bat_priv->mesh_obj = NULL;
 780 out:
 781         return -ENOMEM;
 782 }
 783
 784 /**
 785  * batadv_sysfs_del_meshif() - Remove soft interface specific sysfs entries
 786  * @dev: netdev struct of the soft interface
 787  */
 788 void batadv_sysfs_del_meshif(struct net_device *dev)
 789 {
 790         struct batadv_priv *bat_priv = netdev_priv(dev);
 791         struct batadv_attribute **bat_attr;
 792
 793         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 794                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 795
 796         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 797         kobject_del(bat_priv->mesh_obj);
 798         kobject_put(bat_priv->mesh_obj);
 799         bat_priv->mesh_obj = NULL;
 800 }
 801
 802 /**
 803  * batadv_sysfs_add_vlan() - add all the needed sysfs objects for the new vlan
 804  * @dev: netdev of the mesh interface
 805  * @vlan: private data of the newly added VLAN interface
 806  *
 807  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
 808  */
 809 int batadv_sysfs_add_vlan(struct net_device *dev,
 810                           struct batadv_softif_vlan *vlan)
 811 {
 812         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 813         struct batadv_priv *bat_priv = netdev_priv(dev);
 814         struct batadv_attribute **bat_attr;
 815         int err;
 816
 817         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 818                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 819                         vlan->vid & VLAN_VID_MASK);
 820
 821                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 822                                                     bat_priv->mesh_obj);
 823                 if (!vlan->kobj) {
 824                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 825                                    dev->name, vlan_subdir);
 826                         goto out;
 827                 }
 828         } else {
 829                 /* the untagged LAN uses the root folder to store its "VLAN
 830                  * specific attributes"
 831                  */
 832                 vlan->kobj = bat_priv->mesh_obj;
 833                 kobject_get(bat_priv->mesh_obj);
 834         }
 835
 836         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 837                 err = sysfs_create_file(vlan->kobj,
 838                                         &((*bat_attr)->attr));
 839                 if (err) {
 840                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 841                                    dev->name, vlan_subdir,
 842                                    ((*bat_attr)->attr).name);
 843                         goto rem_attr;
 844                 }
 845         }
 846
 847         return 0;
 848
 849 rem_attr:
 850         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 851                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 852
 853         if (vlan->kobj != bat_priv->mesh_obj) {
 854                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 855                 kobject_del(vlan->kobj);
 856         }
 857         kobject_put(vlan->kobj);
 858         vlan->kobj = NULL;
 859 out:
 860         return -ENOMEM;
 861 }
 862
 863 /**
 864  * batadv_sysfs_del_vlan() - remove all the sysfs objects for a given VLAN
 865  * @bat_priv: the bat priv with all the soft interface information
 866  * @vlan: the private data of the VLAN to destroy
 867  */
 868 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 869                            struct batadv_softif_vlan *vlan)
 870 {
 871         struct batadv_attribute **bat_attr;
 872
 873         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 874                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 875
 876         if (vlan->kobj != bat_priv->mesh_obj) {
 877                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 878                 kobject_del(vlan->kobj);
 879         }
 880         kobject_put(vlan->kobj);
 881         vlan->kobj = NULL;
 882 }
 883
 884 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 885                                       struct attribute *attr, char *buff)
 886 {
 887         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 888         struct batadv_hard_iface *hard_iface;
 889         ssize_t length;
 890         const char *ifname;
 891
 892         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 893         if (!hard_iface)
 894                 return 0;
 895
 896         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 897                 ifname =  "none";
 898         else
 899                 ifname = hard_iface->soft_iface->name;
 900
 901         length = sprintf(buff, "%s\n", ifname);
 902
 903         batadv_hardif_put(hard_iface);
 904
 905         return length;
 906 }
 907
 908 /**
 909  * batadv_store_mesh_iface_finish() - store new hardif mesh_iface state
 910  * @net_dev: netdevice to add/remove to/from batman-adv soft-interface
 911  * @ifname: name of soft-interface to modify
 912  *
 913  * Changes the parts of the hard+soft interface which can not be modified under
 914  * sysfs lock (to prevent deadlock situations).
 915  *
 916  * Return: 0 on success, 0 < on failure
 917  */
 918 static int batadv_store_mesh_iface_finish(struct net_device *net_dev,
 919                                           char ifname[IFNAMSIZ])
 920 {
 921         struct net *net = dev_net(net_dev);
 922         struct batadv_hard_iface *hard_iface;
 923         int status_tmp;
 924         int ret = 0;
 925
 926         ASSERT_RTNL();
 927
 928         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 929         if (!hard_iface)
 930                 return 0;
 931
 932         if (strncmp(ifname, "none", 4) == 0)
 933                 status_tmp = BATADV_IF_NOT_IN_USE;
 934         else
 935                 status_tmp = BATADV_IF_I_WANT_YOU;
 936
 937         if (hard_iface->if_status == status_tmp)
 938                 goto out;
 939
 940         if (hard_iface->soft_iface &&
 941             strncmp(hard_iface->soft_iface->name, ifname, IFNAMSIZ) == 0)
 942                 goto out;
 943
 944         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 945                 batadv_hardif_disable_interface(hard_iface,
 946                                                 BATADV_IF_CLEANUP_AUTO);
 947                 goto out;
 948         }
 949
 950         /* if the interface already is in use */
 951         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 952                 batadv_hardif_disable_interface(hard_iface,
 953                                                 BATADV_IF_CLEANUP_AUTO);
 954
 955         ret = batadv_hardif_enable_interface(hard_iface, net, ifname);
 956 out:
 957         batadv_hardif_put(hard_iface);
 958         return ret;
 959 }
 960
 961 /**
 962  * batadv_store_mesh_iface_work() - store new hardif mesh_iface state
 963  * @work: work queue item
 964  *
 965  * Changes the parts of the hard+soft interface which can not be modified under
 966  * sysfs lock (to prevent deadlock situations).
 967  */
 968 static void batadv_store_mesh_iface_work(struct work_struct *work)
 969 {
 970         struct batadv_store_mesh_work *store_work;
 971         int ret;
 972
 973         store_work = container_of(work, struct batadv_store_mesh_work, work);
 974
 975         rtnl_lock();
 976         ret = batadv_store_mesh_iface_finish(store_work->net_dev,
 977                                              store_work->soft_iface_name);
 978         rtnl_unlock();
 979
 980         if (ret < 0)
 981                 pr_err("Failed to store new mesh_iface state %s for %s: %d\n",
 982                        store_work->soft_iface_name, store_work->net_dev->name,
 983                        ret);
 984
 985         dev_put(store_work->net_dev);
 986         kfree(store_work);
 987 }
 988
 989 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 990                                        struct attribute *attr, char *buff,
 991                                        size_t count)
 992 {
 993         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 994         struct batadv_store_mesh_work *store_work;
 995
 996         if (buff[count - 1] == '\n')
 997                 buff[count - 1] = '\0';
 998
 999         if (strlen(buff) >= IFNAMSIZ) {
1000                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
1001                        buff);
1002                 return -EINVAL;
1003         }
1004
1005         store_work = kmalloc(sizeof(*store_work), GFP_KERNEL);
1006         if (!store_work)
1007                 return -ENOMEM;
1008
1009         dev_hold(net_dev);
1010         INIT_WORK(&store_work->work, batadv_store_mesh_iface_work);
1011         store_work->net_dev = net_dev;
1012         strlcpy(store_work->soft_iface_name, buff,
1013                 sizeof(store_work->soft_iface_name));
1014
1015         queue_work(batadv_event_workqueue, &store_work->work);
1016
1017         return count;
1018 }
1019
1020 static ssize_t batadv_show_iface_status(struct kobject *kobj,
1021                                         struct attribute *attr, char *buff)
1022 {
1023         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1024         struct batadv_hard_iface *hard_iface;
1025         ssize_t length;
1026
1027         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1028         if (!hard_iface)
1029                 return 0;
1030
1031         switch (hard_iface->if_status) {
1032         case BATADV_IF_TO_BE_REMOVED:
1033                 length = sprintf(buff, "disabling\n");
1034                 break;
1035         case BATADV_IF_INACTIVE:
1036                 length = sprintf(buff, "inactive\n");
1037                 break;
1038         case BATADV_IF_ACTIVE:
1039                 length = sprintf(buff, "active\n");
1040                 break;
1041         case BATADV_IF_TO_BE_ACTIVATED:
1042                 length = sprintf(buff, "enabling\n");
1043                 break;
1044         case BATADV_IF_NOT_IN_USE:
1045         default:
1046                 length = sprintf(buff, "not in use\n");
1047                 break;
1048         }
1049
1050         batadv_hardif_put(hard_iface);
1051
1052         return length;
1053 }
1054
1055 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1056
1057 /**
1058  * batadv_store_throughput_override() - parse and store throughput override
1059  *  entered by the user
1060  * @kobj: kobject representing the private mesh sysfs directory
1061  * @attr: the batman-adv attribute the user is interacting with
1062  * @buff: the buffer containing the user data
1063  * @count: number of bytes in the buffer
1064  *
1065  * Return: 'count' on success or a negative error code in case of failure
1066  */
1067 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
1068                                                 struct attribute *attr,
1069                                                 char *buff, size_t count)
1070 {
1071         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1072         struct batadv_hard_iface *hard_iface;
1073         u32 tp_override;
1074         u32 old_tp_override;
1075         bool ret;
1076
1077         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1078         if (!hard_iface)
1079                 return -EINVAL;
1080
1081         if (buff[count - 1] == '\n')
1082                 buff[count - 1] = '\0';
1083
1084         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
1085                                       &tp_override);
1086         if (!ret)
1087                 return count;
1088
1089         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1090         if (old_tp_override == tp_override)
1091                 goto out;
1092
1093         batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n",
1094                     "throughput_override",
1095                     old_tp_override / 10, old_tp_override % 10,
1096                     tp_override / 10, tp_override % 10);
1097
1098         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
1099
1100 out:
1101         batadv_hardif_put(hard_iface);
1102         return count;
1103 }
1104
1105 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
1106                                                struct attribute *attr,
1107                                                char *buff)
1108 {
1109         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1110         struct batadv_hard_iface *hard_iface;
1111         u32 tp_override;
1112
1113         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1114         if (!hard_iface)
1115                 return -EINVAL;
1116
1117         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1118
1119         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
1120                        tp_override % 10);
1121 }
1122
1123 #endif
1124
1125 static BATADV_ATTR(mesh_iface, 0644, batadv_show_mesh_iface,
1126                    batadv_store_mesh_iface);
1127 static BATADV_ATTR(iface_status, 0444, batadv_show_iface_status, NULL);
1128 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1129 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, 0644,
1130                      2 * BATADV_JITTER, INT_MAX, NULL);
1131 static BATADV_ATTR(throughput_override, 0644, batadv_show_throughput_override,
1132                    batadv_store_throughput_override);
1133 #endif
1134
1135 static struct batadv_attribute *batadv_batman_attrs[] = {
1136         &batadv_attr_mesh_iface,
1137         &batadv_attr_iface_status,
1138 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1139         &batadv_attr_elp_interval,
1140         &batadv_attr_throughput_override,
1141 #endif
1142         NULL,
1143 };
1144
1145 /**
1146  * batadv_sysfs_add_hardif() - Add hard interface specific sysfs entries
1147  * @hardif_obj: address where to store the pointer to new sysfs folder
1148  * @dev: netdev struct of the hard interface
1149  *
1150  * Return: 0 on success or negative error number in case of failure
1151  */
1152 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1153 {
1154         struct kobject *hardif_kobject = &dev->dev.kobj;
1155         struct batadv_attribute **bat_attr;
1156         int err;
1157
1158         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1159                                              hardif_kobject);
1160
1161         if (!*hardif_obj) {
1162                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1163                            BATADV_SYSFS_IF_BAT_SUBDIR);
1164                 goto out;
1165         }
1166
1167         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1168                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1169                 if (err) {
1170                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1171                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1172                                    ((*bat_attr)->attr).name);
1173                         goto rem_attr;
1174                 }
1175         }
1176
1177         return 0;
1178
1179 rem_attr:
1180         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1181                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1182 out:
1183         return -ENOMEM;
1184 }
1185
1186 /**
1187  * batadv_sysfs_del_hardif() - Remove hard interface specific sysfs entries
1188  * @hardif_obj: address to the pointer to which stores batman-adv sysfs folder
1189  *  of the hard interface
1190  */
1191 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1192 {
1193         kobject_uevent(*hardif_obj, KOBJ_REMOVE);
1194         kobject_del(*hardif_obj);
1195         kobject_put(*hardif_obj);
1196         *hardif_obj = NULL;
1197 }
1198
1199 /**
1200  * batadv_throw_uevent() - Send an uevent with batman-adv specific env data
1201  * @bat_priv: the bat priv with all the soft interface information
1202  * @type: subsystem type of event. Stored in uevent's BATTYPE
1203  * @action: action type of event. Stored in uevent's BATACTION
1204  * @data: string with additional information to the event (ignored for
1205  *  BATADV_UEV_DEL). Stored in uevent's BATDATA
1206  *
1207  * Return: 0 on success or negative error number in case of failure
1208  */
1209 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
1210                         enum batadv_uev_action action, const char *data)
1211 {
1212         int ret = -ENOMEM;
1213         struct kobject *bat_kobj;
1214         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
1215
1216         bat_kobj = &bat_priv->soft_iface->dev.kobj;
1217
1218         uevent_env[0] = kasprintf(GFP_ATOMIC,
1219                                   "%s%s", BATADV_UEV_TYPE_VAR,
1220                                   batadv_uev_type_str[type]);
1221         if (!uevent_env[0])
1222                 goto out;
1223
1224         uevent_env[1] = kasprintf(GFP_ATOMIC,
1225                                   "%s%s", BATADV_UEV_ACTION_VAR,
1226                                   batadv_uev_action_str[action]);
1227         if (!uevent_env[1])
1228                 goto out;
1229
1230         /* If the event is DEL, ignore the data field */
1231         if (action != BATADV_UEV_DEL) {
1232                 uevent_env[2] = kasprintf(GFP_ATOMIC,
1233                                           "%s%s", BATADV_UEV_DATA_VAR, data);
1234                 if (!uevent_env[2])
1235                         goto out;
1236         }
1237
1238         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
1239 out:
1240         kfree(uevent_env[0]);
1241         kfree(uevent_env[1]);
1242         kfree(uevent_env[2]);
1243
1244         if (ret)
1245                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
1247                            batadv_uev_type_str[type],
1248                            batadv_uev_action_str[action],
1249                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
1250         return ret;
1251 }