net/batman-adv/sysfs.c

   1 /* Copyright (C) 2010-2017  B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "sysfs.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/compiler.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/fs.h>
  26 #include <linux/if.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/kernel.h>
  29 #include <linux/kref.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/printk.h>
  32 #include <linux/rculist.h>
  33 #include <linux/rcupdate.h>
  34 #include <linux/rtnetlink.h>
  35 #include <linux/slab.h>
  36 #include <linux/stddef.h>
  37 #include <linux/string.h>
  38 #include <linux/stringify.h>
  39 #include <linux/workqueue.h>
  40
  41 #include "bridge_loop_avoidance.h"
  42 #include "distributed-arp-table.h"
  43 #include "gateway_client.h"
  44 #include "gateway_common.h"
  45 #include "hard-interface.h"
  46 #include "log.h"
  47 #include "network-coding.h"
  48 #include "packet.h"
  49 #include "soft-interface.h"
  50
  51 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  52 {
  53         struct device *dev = container_of(obj->parent, struct device, kobj);
  54
  55         return to_net_dev(dev);
  56 }
  57
  58 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  59 {
  60         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  61
  62         return netdev_priv(net_dev);
  63 }
  64
  65 /**
  66  * batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv
  67  * @obj: kobject to covert
  68  *
  69  * Return: the associated batadv_priv struct.
  70  */
  71 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  72 {
  73         /* VLAN specific attributes are located in the root sysfs folder if they
  74          * refer to the untagged VLAN..
  75          */
  76         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  77                 return batadv_kobj_to_batpriv(obj);
  78
  79         /* ..while the attributes for the tagged vlans are located in
  80          * the in the corresponding "vlan%VID" subfolder
  81          */
  82         return batadv_kobj_to_batpriv(obj->parent);
  83 }
  84
  85 /**
  86  * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct
  87  * @bat_priv: the bat priv with all the soft interface information
  88  * @obj: kobject to covert
  89  *
  90  * Return: the associated softif_vlan struct if found, NULL otherwise.
  91  */
  92 static struct batadv_softif_vlan *
  93 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  94 {
  95         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
  96
  97         rcu_read_lock();
  98         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
  99                 if (vlan_tmp->kobj != obj)
 100                         continue;
 101
 102                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
 103                         continue;
 104
 105                 vlan = vlan_tmp;
 106                 break;
 107         }
 108         rcu_read_unlock();
 109
 110         return vlan;
 111 }
 112
 113 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
 114 #define BATADV_UEV_ACTION_VAR   "BATACTION="
 115 #define BATADV_UEV_DATA_VAR     "BATDATA="
 116
 117 static char *batadv_uev_action_str[] = {
 118         "add",
 119         "del",
 120         "change",
 121         "loopdetect",
 122 };
 123
 124 static char *batadv_uev_type_str[] = {
 125         "gw",
 126         "bla",
 127 };
 128
 129 /* Use this, if you have customized show and store functions for vlan attrs */
 130 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
 131 struct batadv_attribute batadv_attr_vlan_##_name = {    \
 132         .attr = {.name = __stringify(_name),            \
 133                  .mode = _mode },                       \
 134         .show   = _show,                                \
 135         .store  = _store,                               \
 136 }
 137
 138 /* Use this, if you have customized show and store functions */
 139 #define BATADV_ATTR(_name, _mode, _show, _store)        \
 140 struct batadv_attribute batadv_attr_##_name = {         \
 141         .attr = {.name = __stringify(_name),            \
 142                  .mode = _mode },                       \
 143         .show   = _show,                                \
 144         .store  = _store,                               \
 145 }
 146
 147 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
 148 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 149                              struct attribute *attr, char *buff,        \
 150                              size_t count)                              \
 151 {                                                                       \
 152         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 153         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 154                                                                         \
 155         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
 156                                         &bat_priv->_name, net_dev);     \
 157 }
 158
 159 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
 160 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 161                             struct attribute *attr, char *buff)         \
 162 {                                                                       \
 163         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 164                                                                         \
 165         return sprintf(buff, "%s\n",                                    \
 166                        atomic_read(&bat_priv->_name) == 0 ?             \
 167                        "disabled" : "enabled");                         \
 168 }                                                                       \
 169
 170 /* Use this, if you are going to turn a [name] in the soft-interface
 171  * (bat_priv) on or off
 172  */
 173 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
 174         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
 175         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
 176         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 177                            batadv_store_##_name)
 178
 179 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 180 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 181                              struct attribute *attr, char *buff,        \
 182                              size_t count)                              \
 183 {                                                                       \
 184         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 185         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 186                                                                         \
 187         return __batadv_store_uint_attr(buff, count, _min, _max,        \
 188                                         _post_func, attr,               \
 189                                         &bat_priv->_var, net_dev,       \
 190                                         NULL);  \
 191 }
 192
 193 #define BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                          \
 194 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 195                             struct attribute *attr, char *buff)         \
 196 {                                                                       \
 197         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 198                                                                         \
 199         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var));     \
 200 }                                                                       \
 201
 202 /* Use this, if you are going to set [name] in the soft-interface
 203  * (bat_priv) to an unsigned integer value
 204  */
 205 #define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 206         static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
 207         static BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                   \
 208         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 209                            batadv_store_##_name)
 210
 211 #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)                  \
 212 ssize_t batadv_store_vlan_##_name(struct kobject *kobj,                 \
 213                                   struct attribute *attr, char *buff,   \
 214                                   size_t count)                         \
 215 {                                                                       \
 216         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 217         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 218                                                               kobj);    \
 219         size_t res = __batadv_store_bool_attr(buff, count, _post_func,  \
 220                                               attr, &vlan->_name,       \
 221                                               bat_priv->soft_iface);    \
 222                                                                         \
 223         batadv_softif_vlan_put(vlan);                                   \
 224         return res;                                                     \
 225 }
 226
 227 #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)                               \
 228 ssize_t batadv_show_vlan_##_name(struct kobject *kobj,                  \
 229                                  struct attribute *attr, char *buff)    \
 230 {                                                                       \
 231         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 232         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 233                                                               kobj);    \
 234         size_t res = sprintf(buff, "%s\n",                              \
 235                              atomic_read(&vlan->_name) == 0 ?           \
 236                              "disabled" : "enabled");                   \
 237                                                                         \
 238         batadv_softif_vlan_put(vlan);                                   \
 239         return res;                                                     \
 240 }
 241
 242 /* Use this, if you are going to turn a [name] in the vlan struct on or off */
 243 #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)                 \
 244         static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)           \
 245         static BATADV_ATTR_VLAN_SHOW_BOOL(_name)                        \
 246         static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
 247                                 batadv_store_vlan_##_name)
 248
 249 #define BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 250 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 251                              struct attribute *attr, char *buff,        \
 252                              size_t count)                              \
 253 {                                                                       \
 254         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 255         struct batadv_hard_iface *hard_iface;                           \
 256         ssize_t length;                                                 \
 257                                                                         \
 258         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 259         if (!hard_iface)                                                \
 260                 return 0;                                               \
 261                                                                         \
 262         length = __batadv_store_uint_attr(buff, count, _min, _max,      \
 263                                           _post_func, attr,             \
 264                                           &hard_iface->_var,            \
 265                                           hard_iface->soft_iface,       \
 266                                           net_dev);                     \
 267                                                                         \
 268         batadv_hardif_put(hard_iface);                          \
 269         return length;                                                  \
 270 }
 271
 272 #define BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                          \
 273 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 274                             struct attribute *attr, char *buff)         \
 275 {                                                                       \
 276         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 277         struct batadv_hard_iface *hard_iface;                           \
 278         ssize_t length;                                                 \
 279                                                                         \
 280         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 281         if (!hard_iface)                                                \
 282                 return 0;                                               \
 283                                                                         \
 284         length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \
 285                                                                         \
 286         batadv_hardif_put(hard_iface);                          \
 287         return length;                                                  \
 288 }
 289
 290 /* Use this, if you are going to set [name] in hard_iface to an
 291  * unsigned integer value
 292  */
 293 #define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 294         static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min,            \
 295                                           _max, _post_func)             \
 296         static BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                   \
 297         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 298                            batadv_store_##_name)
 299
 300 static int batadv_store_bool_attr(char *buff, size_t count,
 301                                   struct net_device *net_dev,
 302                                   const char *attr_name, atomic_t *attr,
 303                                   bool *changed)
 304 {
 305         int enabled = -1;
 306
 307         *changed = false;
 308
 309         if (buff[count - 1] == '\n')
 310                 buff[count - 1] = '\0';
 311
 312         if ((strncmp(buff, "1", 2) == 0) ||
 313             (strncmp(buff, "enable", 7) == 0) ||
 314             (strncmp(buff, "enabled", 8) == 0))
 315                 enabled = 1;
 316
 317         if ((strncmp(buff, "0", 2) == 0) ||
 318             (strncmp(buff, "disable", 8) == 0) ||
 319             (strncmp(buff, "disabled", 9) == 0))
 320                 enabled = 0;
 321
 322         if (enabled < 0) {
 323                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 324                             attr_name, buff);
 325                 return -EINVAL;
 326         }
 327
 328         if (atomic_read(attr) == enabled)
 329                 return count;
 330
 331         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 332                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 333                     enabled == 1 ? "enabled" : "disabled");
 334
 335         *changed = true;
 336
 337         atomic_set(attr, (unsigned int)enabled);
 338         return count;
 339 }
 340
 341 static inline ssize_t
 342 __batadv_store_bool_attr(char *buff, size_t count,
 343                          void (*post_func)(struct net_device *),
 344                          struct attribute *attr,
 345                          atomic_t *attr_store, struct net_device *net_dev)
 346 {
 347         bool changed;
 348         int ret;
 349
 350         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 351                                      attr_store, &changed);
 352         if (post_func && changed)
 353                 post_func(net_dev);
 354
 355         return ret;
 356 }
 357
 358 static int batadv_store_uint_attr(const char *buff, size_t count,
 359                                   struct net_device *net_dev,
 360                                   struct net_device *slave_dev,
 361                                   const char *attr_name,
 362                                   unsigned int min, unsigned int max,
 363                                   atomic_t *attr)
 364 {
 365         char ifname[IFNAMSIZ + 3] = "";
 366         unsigned long uint_val;
 367         int ret;
 368
 369         ret = kstrtoul(buff, 10, &uint_val);
 370         if (ret) {
 371                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 372                             attr_name, buff);
 373                 return -EINVAL;
 374         }
 375
 376         if (uint_val < min) {
 377                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 378                             attr_name, uint_val, min);
 379                 return -EINVAL;
 380         }
 381
 382         if (uint_val > max) {
 383                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 384                             attr_name, uint_val, max);
 385                 return -EINVAL;
 386         }
 387
 388         if (atomic_read(attr) == uint_val)
 389                 return count;
 390
 391         if (slave_dev)
 392                 snprintf(ifname, sizeof(ifname), "%s: ", slave_dev->name);
 393
 394         batadv_info(net_dev, "%s: %sChanging from: %i to: %lu\n",
 395                     attr_name, ifname, atomic_read(attr), uint_val);
 396
 397         atomic_set(attr, uint_val);
 398         return count;
 399 }
 400
 401 static ssize_t __batadv_store_uint_attr(const char *buff, size_t count,
 402                                         int min, int max,
 403                                         void (*post_func)(struct net_device *),
 404                                         const struct attribute *attr,
 405                                         atomic_t *attr_store,
 406                                         struct net_device *net_dev,
 407                                         struct net_device *slave_dev)
 408 {
 409         int ret;
 410
 411         ret = batadv_store_uint_attr(buff, count, net_dev, slave_dev,
 412                                      attr->name, min, max, attr_store);
 413         if (post_func && ret)
 414                 post_func(net_dev);
 415
 416         return ret;
 417 }
 418
 419 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 420                                     struct attribute *attr, char *buff)
 421 {
 422         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 423
 424         return sprintf(buff, "%s\n", bat_priv->algo_ops->name);
 425 }
 426
 427 static void batadv_post_gw_reselect(struct net_device *net_dev)
 428 {
 429         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 430
 431         batadv_gw_reselect(bat_priv);
 432 }
 433
 434 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 435                                    char *buff)
 436 {
 437         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 438         int bytes_written;
 439
 440         /* GW mode is not available if the routing algorithm in use does not
 441          * implement the GW API
 442          */
 443         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 444             !bat_priv->algo_ops->gw.is_eligible)
 445                 return -ENOENT;
 446
 447         switch (atomic_read(&bat_priv->gw.mode)) {
 448         case BATADV_GW_MODE_CLIENT:
 449                 bytes_written = sprintf(buff, "%s\n",
 450                                         BATADV_GW_MODE_CLIENT_NAME);
 451                 break;
 452         case BATADV_GW_MODE_SERVER:
 453                 bytes_written = sprintf(buff, "%s\n",
 454                                         BATADV_GW_MODE_SERVER_NAME);
 455                 break;
 456         default:
 457                 bytes_written = sprintf(buff, "%s\n",
 458                                         BATADV_GW_MODE_OFF_NAME);
 459                 break;
 460         }
 461
 462         return bytes_written;
 463 }
 464
 465 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 466                                     struct attribute *attr, char *buff,
 467                                     size_t count)
 468 {
 469         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 470         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 471         char *curr_gw_mode_str;
 472         int gw_mode_tmp = -1;
 473
 474         /* toggling GW mode is allowed only if the routing algorithm in use
 475          * provides the GW API
 476          */
 477         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 478             !bat_priv->algo_ops->gw.is_eligible)
 479                 return -EINVAL;
 480
 481         if (buff[count - 1] == '\n')
 482                 buff[count - 1] = '\0';
 483
 484         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 485                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 486                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 487
 488         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 489                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 490                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 491
 492         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 493                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 494                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 495
 496         if (gw_mode_tmp < 0) {
 497                 batadv_info(net_dev,
 498                             "Invalid parameter for 'gw mode' setting received: %s\n",
 499                             buff);
 500                 return -EINVAL;
 501         }
 502
 503         if (atomic_read(&bat_priv->gw.mode) == gw_mode_tmp)
 504                 return count;
 505
 506         switch (atomic_read(&bat_priv->gw.mode)) {
 507         case BATADV_GW_MODE_CLIENT:
 508                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 509                 break;
 510         case BATADV_GW_MODE_SERVER:
 511                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 512                 break;
 513         default:
 514                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 515                 break;
 516         }
 517
 518         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 519                     curr_gw_mode_str, buff);
 520
 521         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 522          * current GW. It will only instruct the gateway client code to perform
 523          * a re-election the next time that this is needed.
 524          *
 525          * When gw client mode is being switched off the current GW must be
 526          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 527          * client mode re-activation. This is operation is performed in
 528          * batadv_gw_check_client_stop().
 529          */
 530         batadv_gw_reselect(bat_priv);
 531         /* always call batadv_gw_check_client_stop() before changing the gateway
 532          * state
 533          */
 534         batadv_gw_check_client_stop(bat_priv);
 535         atomic_set(&bat_priv->gw.mode, (unsigned int)gw_mode_tmp);
 536         batadv_gw_tvlv_container_update(bat_priv);
 537         return count;
 538 }
 539
 540 static ssize_t batadv_show_gw_sel_class(struct kobject *kobj,
 541                                         struct attribute *attr, char *buff)
 542 {
 543         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 544
 545         /* GW selection class is not available if the routing algorithm in use
 546          * does not implement the GW API
 547          */
 548         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 549             !bat_priv->algo_ops->gw.is_eligible)
 550                 return -ENOENT;
 551
 552         if (bat_priv->algo_ops->gw.show_sel_class)
 553                 return bat_priv->algo_ops->gw.show_sel_class(bat_priv, buff);
 554
 555         return sprintf(buff, "%i\n", atomic_read(&bat_priv->gw.sel_class));
 556 }
 557
 558 static ssize_t batadv_store_gw_sel_class(struct kobject *kobj,
 559                                          struct attribute *attr, char *buff,
 560                                          size_t count)
 561 {
 562         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 563
 564         /* setting the GW selection class is allowed only if the routing
 565          * algorithm in use implements the GW API
 566          */
 567         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 568             !bat_priv->algo_ops->gw.is_eligible)
 569                 return -EINVAL;
 570
 571         if (buff[count - 1] == '\n')
 572                 buff[count - 1] = '\0';
 573
 574         if (bat_priv->algo_ops->gw.store_sel_class)
 575                 return bat_priv->algo_ops->gw.store_sel_class(bat_priv, buff,
 576                                                               count);
 577
 578         return __batadv_store_uint_attr(buff, count, 1, BATADV_TQ_MAX_VALUE,
 579                                         batadv_post_gw_reselect, attr,
 580                                         &bat_priv->gw.sel_class,
 581                                         bat_priv->soft_iface, NULL);
 582 }
 583
 584 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 585                                      struct attribute *attr, char *buff)
 586 {
 587         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 588         u32 down, up;
 589
 590         down = atomic_read(&bat_priv->gw.bandwidth_down);
 591         up = atomic_read(&bat_priv->gw.bandwidth_up);
 592
 593         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 594                        down % 10, up / 10, up % 10);
 595 }
 596
 597 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 598                                       struct attribute *attr, char *buff,
 599                                       size_t count)
 600 {
 601         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 602
 603         if (buff[count - 1] == '\n')
 604                 buff[count - 1] = '\0';
 605
 606         return batadv_gw_bandwidth_set(net_dev, buff, count);
 607 }
 608
 609 /**
 610  * batadv_show_isolation_mark - print the current isolation mark/mask
 611  * @kobj: kobject representing the private mesh sysfs directory
 612  * @attr: the batman-adv attribute the user is interacting with
 613  * @buff: the buffer that will contain the data to send back to the user
 614  *
 615  * Return: the number of bytes written into 'buff' on success or a negative
 616  * error code in case of failure
 617  */
 618 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 619                                           struct attribute *attr, char *buff)
 620 {
 621         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 622
 623         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 624                        bat_priv->isolation_mark_mask);
 625 }
 626
 627 /**
 628  * batadv_store_isolation_mark - parse and store the isolation mark/mask entered
 629  *  by the user
 630  * @kobj: kobject representing the private mesh sysfs directory
 631  * @attr: the batman-adv attribute the user is interacting with
 632  * @buff: the buffer containing the user data
 633  * @count: number of bytes in the buffer
 634  *
 635  * Return: 'count' on success or a negative error code in case of failure
 636  */
 637 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 638                                            struct attribute *attr, char *buff,
 639                                            size_t count)
 640 {
 641         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 642         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 643         u32 mark, mask;
 644         char *mask_ptr;
 645
 646         /* parse the mask if it has been specified, otherwise assume the mask is
 647          * the biggest possible
 648          */
 649         mask = 0xFFFFFFFF;
 650         mask_ptr = strchr(buff, '/');
 651         if (mask_ptr) {
 652                 *mask_ptr = '\0';
 653                 mask_ptr++;
 654
 655                 /* the mask must be entered in hex base as it is going to be a
 656                  * bitmask and not a prefix length
 657                  */
 658                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 659                         return -EINVAL;
 660         }
 661
 662         /* the mark can be entered in any base */
 663         if (kstrtou32(buff, 0, &mark) < 0)
 664                 return -EINVAL;
 665
 666         bat_priv->isolation_mark_mask = mask;
 667         /* erase bits not covered by the mask */
 668         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 669
 670         batadv_info(net_dev,
 671                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 672                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 673
 674         return count;
 675 }
 676
 677 BATADV_ATTR_SIF_BOOL(aggregated_ogms, 0644, NULL);
 678 BATADV_ATTR_SIF_BOOL(bonding, 0644, NULL);
 679 #ifdef CONFIG_BATMAN_ADV_BLA
 680 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, 0644, batadv_bla_status_update);
 681 #endif
 682 #ifdef CONFIG_BATMAN_ADV_DAT
 683 BATADV_ATTR_SIF_BOOL(distributed_arp_table, 0644, batadv_dat_status_update);
 684 #endif
 685 BATADV_ATTR_SIF_BOOL(fragmentation, 0644, batadv_update_min_mtu);
 686 static BATADV_ATTR(routing_algo, 0444, batadv_show_bat_algo, NULL);
 687 static BATADV_ATTR(gw_mode, 0644, batadv_show_gw_mode, batadv_store_gw_mode);
 688 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, 0644, 2 * BATADV_JITTER,
 689                      INT_MAX, NULL);
 690 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, 0644, 0, BATADV_TQ_MAX_VALUE,
 691                      NULL);
 692 static BATADV_ATTR(gw_sel_class, 0644, batadv_show_gw_sel_class,
 693                    batadv_store_gw_sel_class);
 694 static BATADV_ATTR(gw_bandwidth, 0644, batadv_show_gw_bwidth,
 695                    batadv_store_gw_bwidth);
 696 #ifdef CONFIG_BATMAN_ADV_MCAST
 697 BATADV_ATTR_SIF_BOOL(multicast_mode, 0644, NULL);
 698 #endif
 699 #ifdef CONFIG_BATMAN_ADV_DEBUG
 700 BATADV_ATTR_SIF_UINT(log_level, log_level, 0644, 0, BATADV_DBG_ALL, NULL);
 701 #endif
 702 #ifdef CONFIG_BATMAN_ADV_NC
 703 BATADV_ATTR_SIF_BOOL(network_coding, 0644, batadv_nc_status_update);
 704 #endif
 705 static BATADV_ATTR(isolation_mark, 0644, batadv_show_isolation_mark,
 706                    batadv_store_isolation_mark);
 707
 708 static struct batadv_attribute *batadv_mesh_attrs[] = {
 709         &batadv_attr_aggregated_ogms,
 710         &batadv_attr_bonding,
 711 #ifdef CONFIG_BATMAN_ADV_BLA
 712         &batadv_attr_bridge_loop_avoidance,
 713 #endif
 714 #ifdef CONFIG_BATMAN_ADV_DAT
 715         &batadv_attr_distributed_arp_table,
 716 #endif
 717 #ifdef CONFIG_BATMAN_ADV_MCAST
 718         &batadv_attr_multicast_mode,
 719 #endif
 720         &batadv_attr_fragmentation,
 721         &batadv_attr_routing_algo,
 722         &batadv_attr_gw_mode,
 723         &batadv_attr_orig_interval,
 724         &batadv_attr_hop_penalty,
 725         &batadv_attr_gw_sel_class,
 726         &batadv_attr_gw_bandwidth,
 727 #ifdef CONFIG_BATMAN_ADV_DEBUG
 728         &batadv_attr_log_level,
 729 #endif
 730 #ifdef CONFIG_BATMAN_ADV_NC
 731         &batadv_attr_network_coding,
 732 #endif
 733         &batadv_attr_isolation_mark,
 734         NULL,
 735 };
 736
 737 BATADV_ATTR_VLAN_BOOL(ap_isolation, 0644, NULL);
 738
 739 /* array of vlan specific sysfs attributes */
 740 static struct batadv_attribute *batadv_vlan_attrs[] = {
 741         &batadv_attr_vlan_ap_isolation,
 742         NULL,
 743 };
 744
 745 int batadv_sysfs_add_meshif(struct net_device *dev)
 746 {
 747         struct kobject *batif_kobject = &dev->dev.kobj;
 748         struct batadv_priv *bat_priv = netdev_priv(dev);
 749         struct batadv_attribute **bat_attr;
 750         int err;
 751
 752         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 753                                                     batif_kobject);
 754         if (!bat_priv->mesh_obj) {
 755                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 756                            BATADV_SYSFS_IF_MESH_SUBDIR);
 757                 goto out;
 758         }
 759
 760         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 761                 err = sysfs_create_file(bat_priv->mesh_obj,
 762                                         &((*bat_attr)->attr));
 763                 if (err) {
 764                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 765                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 766                                    ((*bat_attr)->attr).name);
 767                         goto rem_attr;
 768                 }
 769         }
 770
 771         return 0;
 772
 773 rem_attr:
 774         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 775                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 776
 777         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 778         kobject_del(bat_priv->mesh_obj);
 779         kobject_put(bat_priv->mesh_obj);
 780         bat_priv->mesh_obj = NULL;
 781 out:
 782         return -ENOMEM;
 783 }
 784
 785 void batadv_sysfs_del_meshif(struct net_device *dev)
 786 {
 787         struct batadv_priv *bat_priv = netdev_priv(dev);
 788         struct batadv_attribute **bat_attr;
 789
 790         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 791                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 792
 793         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 794         kobject_del(bat_priv->mesh_obj);
 795         kobject_put(bat_priv->mesh_obj);
 796         bat_priv->mesh_obj = NULL;
 797 }
 798
 799 /**
 800  * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan
 801  * @dev: netdev of the mesh interface
 802  * @vlan: private data of the newly added VLAN interface
 803  *
 804  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
 805  */
 806 int batadv_sysfs_add_vlan(struct net_device *dev,
 807                           struct batadv_softif_vlan *vlan)
 808 {
 809         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 810         struct batadv_priv *bat_priv = netdev_priv(dev);
 811         struct batadv_attribute **bat_attr;
 812         int err;
 813
 814         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 815                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 816                         vlan->vid & VLAN_VID_MASK);
 817
 818                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 819                                                     bat_priv->mesh_obj);
 820                 if (!vlan->kobj) {
 821                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 822                                    dev->name, vlan_subdir);
 823                         goto out;
 824                 }
 825         } else {
 826                 /* the untagged LAN uses the root folder to store its "VLAN
 827                  * specific attributes"
 828                  */
 829                 vlan->kobj = bat_priv->mesh_obj;
 830                 kobject_get(bat_priv->mesh_obj);
 831         }
 832
 833         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 834                 err = sysfs_create_file(vlan->kobj,
 835                                         &((*bat_attr)->attr));
 836                 if (err) {
 837                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 838                                    dev->name, vlan_subdir,
 839                                    ((*bat_attr)->attr).name);
 840                         goto rem_attr;
 841                 }
 842         }
 843
 844         return 0;
 845
 846 rem_attr:
 847         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 848                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 849
 850         if (vlan->kobj != bat_priv->mesh_obj) {
 851                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 852                 kobject_del(vlan->kobj);
 853         }
 854         kobject_put(vlan->kobj);
 855         vlan->kobj = NULL;
 856 out:
 857         return -ENOMEM;
 858 }
 859
 860 /**
 861  * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN
 862  * @bat_priv: the bat priv with all the soft interface information
 863  * @vlan: the private data of the VLAN to destroy
 864  */
 865 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 866                            struct batadv_softif_vlan *vlan)
 867 {
 868         struct batadv_attribute **bat_attr;
 869
 870         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 871                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 872
 873         if (vlan->kobj != bat_priv->mesh_obj) {
 874                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 875                 kobject_del(vlan->kobj);
 876         }
 877         kobject_put(vlan->kobj);
 878         vlan->kobj = NULL;
 879 }
 880
 881 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 882                                       struct attribute *attr, char *buff)
 883 {
 884         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 885         struct batadv_hard_iface *hard_iface;
 886         ssize_t length;
 887         const char *ifname;
 888
 889         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 890         if (!hard_iface)
 891                 return 0;
 892
 893         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 894                 ifname =  "none";
 895         else
 896                 ifname = hard_iface->soft_iface->name;
 897
 898         length = sprintf(buff, "%s\n", ifname);
 899
 900         batadv_hardif_put(hard_iface);
 901
 902         return length;
 903 }
 904
 905 /**
 906  * batadv_store_mesh_iface_finish - store new hardif mesh_iface state
 907  * @net_dev: netdevice to add/remove to/from batman-adv soft-interface
 908  * @ifname: name of soft-interface to modify
 909  *
 910  * Changes the parts of the hard+soft interface which can not be modified under
 911  * sysfs lock (to prevent deadlock situations).
 912  *
 913  * Return: 0 on success, 0 < on failure
 914  */
 915 static int batadv_store_mesh_iface_finish(struct net_device *net_dev,
 916                                           char ifname[IFNAMSIZ])
 917 {
 918         struct net *net = dev_net(net_dev);
 919         struct batadv_hard_iface *hard_iface;
 920         int status_tmp;
 921         int ret = 0;
 922
 923         ASSERT_RTNL();
 924
 925         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 926         if (!hard_iface)
 927                 return 0;
 928
 929         if (strncmp(ifname, "none", 4) == 0)
 930                 status_tmp = BATADV_IF_NOT_IN_USE;
 931         else
 932                 status_tmp = BATADV_IF_I_WANT_YOU;
 933
 934         if (hard_iface->if_status == status_tmp)
 935                 goto out;
 936
 937         if ((hard_iface->soft_iface) &&
 938             (strncmp(hard_iface->soft_iface->name, ifname, IFNAMSIZ) == 0))
 939                 goto out;
 940
 941         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 942                 batadv_hardif_disable_interface(hard_iface,
 943                                                 BATADV_IF_CLEANUP_AUTO);
 944                 goto out;
 945         }
 946
 947         /* if the interface already is in use */
 948         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 949                 batadv_hardif_disable_interface(hard_iface,
 950                                                 BATADV_IF_CLEANUP_AUTO);
 951
 952         ret = batadv_hardif_enable_interface(hard_iface, net, ifname);
 953 out:
 954         batadv_hardif_put(hard_iface);
 955         return ret;
 956 }
 957
 958 /**
 959  * batadv_store_mesh_iface_work - store new hardif mesh_iface state
 960  * @work: work queue item
 961  *
 962  * Changes the parts of the hard+soft interface which can not be modified under
 963  * sysfs lock (to prevent deadlock situations).
 964  */
 965 static void batadv_store_mesh_iface_work(struct work_struct *work)
 966 {
 967         struct batadv_store_mesh_work *store_work;
 968         int ret;
 969
 970         store_work = container_of(work, struct batadv_store_mesh_work, work);
 971
 972         rtnl_lock();
 973         ret = batadv_store_mesh_iface_finish(store_work->net_dev,
 974                                              store_work->soft_iface_name);
 975         rtnl_unlock();
 976
 977         if (ret < 0)
 978                 pr_err("Failed to store new mesh_iface state %s for %s: %d\n",
 979                        store_work->soft_iface_name, store_work->net_dev->name,
 980                        ret);
 981
 982         dev_put(store_work->net_dev);
 983         kfree(store_work);
 984 }
 985
 986 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 987                                        struct attribute *attr, char *buff,
 988                                        size_t count)
 989 {
 990         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 991         struct batadv_store_mesh_work *store_work;
 992
 993         if (buff[count - 1] == '\n')
 994                 buff[count - 1] = '\0';
 995
 996         if (strlen(buff) >= IFNAMSIZ) {
 997                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
 998                        buff);
 999                 return -EINVAL;
1000         }
1001
1002         store_work = kmalloc(sizeof(*store_work), GFP_KERNEL);
1003         if (!store_work)
1004                 return -ENOMEM;
1005
1006         dev_hold(net_dev);
1007         INIT_WORK(&store_work->work, batadv_store_mesh_iface_work);
1008         store_work->net_dev = net_dev;
1009         strlcpy(store_work->soft_iface_name, buff,
1010                 sizeof(store_work->soft_iface_name));
1011
1012         queue_work(batadv_event_workqueue, &store_work->work);
1013
1014         return count;
1015 }
1016
1017 static ssize_t batadv_show_iface_status(struct kobject *kobj,
1018                                         struct attribute *attr, char *buff)
1019 {
1020         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1021         struct batadv_hard_iface *hard_iface;
1022         ssize_t length;
1023
1024         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1025         if (!hard_iface)
1026                 return 0;
1027
1028         switch (hard_iface->if_status) {
1029         case BATADV_IF_TO_BE_REMOVED:
1030                 length = sprintf(buff, "disabling\n");
1031                 break;
1032         case BATADV_IF_INACTIVE:
1033                 length = sprintf(buff, "inactive\n");
1034                 break;
1035         case BATADV_IF_ACTIVE:
1036                 length = sprintf(buff, "active\n");
1037                 break;
1038         case BATADV_IF_TO_BE_ACTIVATED:
1039                 length = sprintf(buff, "enabling\n");
1040                 break;
1041         case BATADV_IF_NOT_IN_USE:
1042         default:
1043                 length = sprintf(buff, "not in use\n");
1044                 break;
1045         }
1046
1047         batadv_hardif_put(hard_iface);
1048
1049         return length;
1050 }
1051
1052 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1053
1054 /**
1055  * batadv_store_throughput_override - parse and store throughput override
1056  *  entered by the user
1057  * @kobj: kobject representing the private mesh sysfs directory
1058  * @attr: the batman-adv attribute the user is interacting with
1059  * @buff: the buffer containing the user data
1060  * @count: number of bytes in the buffer
1061  *
1062  * Return: 'count' on success or a negative error code in case of failure
1063  */
1064 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
1065                                                 struct attribute *attr,
1066                                                 char *buff, size_t count)
1067 {
1068         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1069         struct batadv_hard_iface *hard_iface;
1070         u32 tp_override;
1071         u32 old_tp_override;
1072         bool ret;
1073
1074         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1075         if (!hard_iface)
1076                 return -EINVAL;
1077
1078         if (buff[count - 1] == '\n')
1079                 buff[count - 1] = '\0';
1080
1081         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
1082                                       &tp_override);
1083         if (!ret)
1084                 goto out;
1085
1086         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1087         if (old_tp_override == tp_override)
1088                 goto out;
1089
1090         batadv_info(hard_iface->soft_iface,
1091                     "%s: %s: Changing from: %u.%u MBit to: %u.%u MBit\n",
1092                     "throughput_override", net_dev->name,
1093                     old_tp_override / 10, old_tp_override % 10,
1094                     tp_override / 10, tp_override % 10);
1095
1096         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
1097
1098 out:
1099         batadv_hardif_put(hard_iface);
1100         return count;
1101 }
1102
1103 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
1104                                                struct attribute *attr,
1105                                                char *buff)
1106 {
1107         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1108         struct batadv_hard_iface *hard_iface;
1109         u32 tp_override;
1110
1111         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1112         if (!hard_iface)
1113                 return -EINVAL;
1114
1115         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1116
1117         batadv_hardif_put(hard_iface);
1118         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
1119                        tp_override % 10);
1120 }
1121
1122 #endif
1123
1124 static BATADV_ATTR(mesh_iface, 0644, batadv_show_mesh_iface,
1125                    batadv_store_mesh_iface);
1126 static BATADV_ATTR(iface_status, 0444, batadv_show_iface_status, NULL);
1127 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1128 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, 0644,
1129                      2 * BATADV_JITTER, INT_MAX, NULL);
1130 static BATADV_ATTR(throughput_override, 0644, batadv_show_throughput_override,
1131                    batadv_store_throughput_override);
1132 #endif
1133
1134 static struct batadv_attribute *batadv_batman_attrs[] = {
1135         &batadv_attr_mesh_iface,
1136         &batadv_attr_iface_status,
1137 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1138         &batadv_attr_elp_interval,
1139         &batadv_attr_throughput_override,
1140 #endif
1141         NULL,
1142 };
1143
1144 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1145 {
1146         struct kobject *hardif_kobject = &dev->dev.kobj;
1147         struct batadv_attribute **bat_attr;
1148         int err;
1149
1150         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1151                                              hardif_kobject);
1152
1153         if (!*hardif_obj) {
1154                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1155                            BATADV_SYSFS_IF_BAT_SUBDIR);
1156                 goto out;
1157         }
1158
1159         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1160                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1161                 if (err) {
1162                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1163                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1164                                    ((*bat_attr)->attr).name);
1165                         goto rem_attr;
1166                 }
1167         }
1168
1169         return 0;
1170
1171 rem_attr:
1172         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1173                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1174 out:
1175         return -ENOMEM;
1176 }
1177
1178 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1179 {
1180         kobject_uevent(*hardif_obj, KOBJ_REMOVE);
1181         kobject_del(*hardif_obj);
1182         kobject_put(*hardif_obj);
1183         *hardif_obj = NULL;
1184 }
1185
1186 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
1187                         enum batadv_uev_action action, const char *data)
1188 {
1189         int ret = -ENOMEM;
1190         struct kobject *bat_kobj;
1191         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
1192
1193         bat_kobj = &bat_priv->soft_iface->dev.kobj;
1194
1195         uevent_env[0] = kasprintf(GFP_ATOMIC,
1196                                   "%s%s", BATADV_UEV_TYPE_VAR,
1197                                   batadv_uev_type_str[type]);
1198         if (!uevent_env[0])
1199                 goto out;
1200
1201         uevent_env[1] = kasprintf(GFP_ATOMIC,
1202                                   "%s%s", BATADV_UEV_ACTION_VAR,
1203                                   batadv_uev_action_str[action]);
1204         if (!uevent_env[1])
1205                 goto out;
1206
1207         /* If the event is DEL, ignore the data field */
1208         if (action != BATADV_UEV_DEL) {
1209                 uevent_env[2] = kasprintf(GFP_ATOMIC,
1210                                           "%s%s", BATADV_UEV_DATA_VAR, data);
1211                 if (!uevent_env[2])
1212                         goto out;
1213         }
1214
1215         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
1216 out:
1217         kfree(uevent_env[0]);
1218         kfree(uevent_env[1]);
1219         kfree(uevent_env[2]);
1220
1221         if (ret)
1222                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1223                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
1224                            batadv_uev_type_str[type],
1225                            batadv_uev_action_str[action],
1226                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
1227         return ret;
1228 }