net/batman-adv/sysfs.c

   1 /* Copyright (C) 2010-2016  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/stat.h>
  37 #include <linux/stddef.h>
  38 #include <linux/string.h>
  39 #include <linux/stringify.h>
  40 #include <linux/workqueue.h>
  41
  42 #include "bridge_loop_avoidance.h"
  43 #include "distributed-arp-table.h"
  44 #include "gateway_client.h"
  45 #include "gateway_common.h"
  46 #include "hard-interface.h"
  47 #include "log.h"
  48 #include "network-coding.h"
  49 #include "packet.h"
  50 #include "soft-interface.h"
  51
  52 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  53 {
  54         struct device *dev = container_of(obj->parent, struct device, kobj);
  55
  56         return to_net_dev(dev);
  57 }
  58
  59 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  60 {
  61         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  62
  63         return netdev_priv(net_dev);
  64 }
  65
  66 /**
  67  * batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv
  68  * @obj: kobject to covert
  69  *
  70  * Return: the associated batadv_priv struct.
  71  */
  72 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  73 {
  74         /* VLAN specific attributes are located in the root sysfs folder if they
  75          * refer to the untagged VLAN..
  76          */
  77         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  78                 return batadv_kobj_to_batpriv(obj);
  79
  80         /* ..while the attributes for the tagged vlans are located in
  81          * the in the corresponding "vlan%VID" subfolder
  82          */
  83         return batadv_kobj_to_batpriv(obj->parent);
  84 }
  85
  86 /**
  87  * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct
  88  * @bat_priv: the bat priv with all the soft interface information
  89  * @obj: kobject to covert
  90  *
  91  * Return: the associated softif_vlan struct if found, NULL otherwise.
  92  */
  93 static struct batadv_softif_vlan *
  94 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  95 {
  96         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
  97
  98         rcu_read_lock();
  99         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 100                 if (vlan_tmp->kobj != obj)
 101                         continue;
 102
 103                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
 104                         continue;
 105
 106                 vlan = vlan_tmp;
 107                 break;
 108         }
 109         rcu_read_unlock();
 110
 111         return vlan;
 112 }
 113
 114 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
 115 #define BATADV_UEV_ACTION_VAR   "BATACTION="
 116 #define BATADV_UEV_DATA_VAR     "BATDATA="
 117
 118 static char *batadv_uev_action_str[] = {
 119         "add",
 120         "del",
 121         "change",
 122         "loopdetect",
 123 };
 124
 125 static char *batadv_uev_type_str[] = {
 126         "gw",
 127         "bla",
 128 };
 129
 130 /* Use this, if you have customized show and store functions for vlan attrs */
 131 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
 132 struct batadv_attribute batadv_attr_vlan_##_name = {    \
 133         .attr = {.name = __stringify(_name),            \
 134                  .mode = _mode },                       \
 135         .show   = _show,                                \
 136         .store  = _store,                               \
 137 }
 138
 139 /* Use this, if you have customized show and store functions */
 140 #define BATADV_ATTR(_name, _mode, _show, _store)        \
 141 struct batadv_attribute batadv_attr_##_name = {         \
 142         .attr = {.name = __stringify(_name),            \
 143                  .mode = _mode },                       \
 144         .show   = _show,                                \
 145         .store  = _store,                               \
 146 }
 147
 148 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
 149 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 150                              struct attribute *attr, char *buff,        \
 151                              size_t count)                              \
 152 {                                                                       \
 153         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 154         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 155                                                                         \
 156         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
 157                                         &bat_priv->_name, net_dev);     \
 158 }
 159
 160 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
 161 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 162                             struct attribute *attr, char *buff)         \
 163 {                                                                       \
 164         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 165                                                                         \
 166         return sprintf(buff, "%s\n",                                    \
 167                        atomic_read(&bat_priv->_name) == 0 ?             \
 168                        "disabled" : "enabled");                         \
 169 }                                                                       \
 170
 171 /* Use this, if you are going to turn a [name] in the soft-interface
 172  * (bat_priv) on or off
 173  */
 174 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
 175         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
 176         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
 177         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 178                            batadv_store_##_name)
 179
 180 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 181 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 182                              struct attribute *attr, char *buff,        \
 183                              size_t count)                              \
 184 {                                                                       \
 185         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 186         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 187                                                                         \
 188         return __batadv_store_uint_attr(buff, count, _min, _max,        \
 189                                         _post_func, attr,               \
 190                                         &bat_priv->_var, net_dev);      \
 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, net_dev);  \
 265                                                                         \
 266         batadv_hardif_put(hard_iface);                          \
 267         return length;                                                  \
 268 }
 269
 270 #define BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                          \
 271 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 272                             struct attribute *attr, char *buff)         \
 273 {                                                                       \
 274         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 275         struct batadv_hard_iface *hard_iface;                           \
 276         ssize_t length;                                                 \
 277                                                                         \
 278         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 279         if (!hard_iface)                                                \
 280                 return 0;                                               \
 281                                                                         \
 282         length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \
 283                                                                         \
 284         batadv_hardif_put(hard_iface);                          \
 285         return length;                                                  \
 286 }
 287
 288 /* Use this, if you are going to set [name] in hard_iface to an
 289  * unsigned integer value
 290  */
 291 #define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 292         static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min,            \
 293                                           _max, _post_func)             \
 294         static BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                   \
 295         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 296                            batadv_store_##_name)
 297
 298 static int batadv_store_bool_attr(char *buff, size_t count,
 299                                   struct net_device *net_dev,
 300                                   const char *attr_name, atomic_t *attr,
 301                                   bool *changed)
 302 {
 303         int enabled = -1;
 304
 305         *changed = false;
 306
 307         if (buff[count - 1] == '\n')
 308                 buff[count - 1] = '\0';
 309
 310         if ((strncmp(buff, "1", 2) == 0) ||
 311             (strncmp(buff, "enable", 7) == 0) ||
 312             (strncmp(buff, "enabled", 8) == 0))
 313                 enabled = 1;
 314
 315         if ((strncmp(buff, "0", 2) == 0) ||
 316             (strncmp(buff, "disable", 8) == 0) ||
 317             (strncmp(buff, "disabled", 9) == 0))
 318                 enabled = 0;
 319
 320         if (enabled < 0) {
 321                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 322                             attr_name, buff);
 323                 return -EINVAL;
 324         }
 325
 326         if (atomic_read(attr) == enabled)
 327                 return count;
 328
 329         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 330                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 331                     enabled == 1 ? "enabled" : "disabled");
 332
 333         *changed = true;
 334
 335         atomic_set(attr, (unsigned int)enabled);
 336         return count;
 337 }
 338
 339 static inline ssize_t
 340 __batadv_store_bool_attr(char *buff, size_t count,
 341                          void (*post_func)(struct net_device *),
 342                          struct attribute *attr,
 343                          atomic_t *attr_store, struct net_device *net_dev)
 344 {
 345         bool changed;
 346         int ret;
 347
 348         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 349                                      attr_store, &changed);
 350         if (post_func && changed)
 351                 post_func(net_dev);
 352
 353         return ret;
 354 }
 355
 356 static int batadv_store_uint_attr(const char *buff, size_t count,
 357                                   struct net_device *net_dev,
 358                                   const char *attr_name,
 359                                   unsigned int min, unsigned int max,
 360                                   atomic_t *attr)
 361 {
 362         unsigned long uint_val;
 363         int ret;
 364
 365         ret = kstrtoul(buff, 10, &uint_val);
 366         if (ret) {
 367                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 368                             attr_name, buff);
 369                 return -EINVAL;
 370         }
 371
 372         if (uint_val < min) {
 373                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 374                             attr_name, uint_val, min);
 375                 return -EINVAL;
 376         }
 377
 378         if (uint_val > max) {
 379                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 380                             attr_name, uint_val, max);
 381                 return -EINVAL;
 382         }
 383
 384         if (atomic_read(attr) == uint_val)
 385                 return count;
 386
 387         batadv_info(net_dev, "%s: Changing from: %i to: %lu\n",
 388                     attr_name, atomic_read(attr), uint_val);
 389
 390         atomic_set(attr, uint_val);
 391         return count;
 392 }
 393
 394 static ssize_t __batadv_store_uint_attr(const char *buff, size_t count,
 395                                         int min, int max,
 396                                         void (*post_func)(struct net_device *),
 397                                         const struct attribute *attr,
 398                                         atomic_t *attr_store,
 399                                         struct net_device *net_dev)
 400 {
 401         int ret;
 402
 403         ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
 404                                      attr_store);
 405         if (post_func && ret)
 406                 post_func(net_dev);
 407
 408         return ret;
 409 }
 410
 411 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 412                                     struct attribute *attr, char *buff)
 413 {
 414         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 415
 416         return sprintf(buff, "%s\n", bat_priv->algo_ops->name);
 417 }
 418
 419 static void batadv_post_gw_reselect(struct net_device *net_dev)
 420 {
 421         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 422
 423         batadv_gw_reselect(bat_priv);
 424 }
 425
 426 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 427                                    char *buff)
 428 {
 429         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 430         int bytes_written;
 431
 432         /* GW mode is not available if the routing algorithm in use does not
 433          * implement the GW API
 434          */
 435         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 436             !bat_priv->algo_ops->gw.is_eligible)
 437                 return -ENOENT;
 438
 439         switch (atomic_read(&bat_priv->gw.mode)) {
 440         case BATADV_GW_MODE_CLIENT:
 441                 bytes_written = sprintf(buff, "%s\n",
 442                                         BATADV_GW_MODE_CLIENT_NAME);
 443                 break;
 444         case BATADV_GW_MODE_SERVER:
 445                 bytes_written = sprintf(buff, "%s\n",
 446                                         BATADV_GW_MODE_SERVER_NAME);
 447                 break;
 448         default:
 449                 bytes_written = sprintf(buff, "%s\n",
 450                                         BATADV_GW_MODE_OFF_NAME);
 451                 break;
 452         }
 453
 454         return bytes_written;
 455 }
 456
 457 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 458                                     struct attribute *attr, char *buff,
 459                                     size_t count)
 460 {
 461         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 462         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 463         char *curr_gw_mode_str;
 464         int gw_mode_tmp = -1;
 465
 466         /* toggling GW mode is allowed only if the routing algorithm in use
 467          * provides the GW API
 468          */
 469         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 470             !bat_priv->algo_ops->gw.is_eligible)
 471                 return -EINVAL;
 472
 473         if (buff[count - 1] == '\n')
 474                 buff[count - 1] = '\0';
 475
 476         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 477                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 478                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 479
 480         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 481                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 482                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 483
 484         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 485                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 486                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 487
 488         if (gw_mode_tmp < 0) {
 489                 batadv_info(net_dev,
 490                             "Invalid parameter for 'gw mode' setting received: %s\n",
 491                             buff);
 492                 return -EINVAL;
 493         }
 494
 495         if (atomic_read(&bat_priv->gw.mode) == gw_mode_tmp)
 496                 return count;
 497
 498         switch (atomic_read(&bat_priv->gw.mode)) {
 499         case BATADV_GW_MODE_CLIENT:
 500                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 501                 break;
 502         case BATADV_GW_MODE_SERVER:
 503                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 504                 break;
 505         default:
 506                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 507                 break;
 508         }
 509
 510         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 511                     curr_gw_mode_str, buff);
 512
 513         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 514          * current GW. It will only instruct the gateway client code to perform
 515          * a re-election the next time that this is needed.
 516          *
 517          * When gw client mode is being switched off the current GW must be
 518          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 519          * client mode re-activation. This is operation is performed in
 520          * batadv_gw_check_client_stop().
 521          */
 522         batadv_gw_reselect(bat_priv);
 523         /* always call batadv_gw_check_client_stop() before changing the gateway
 524          * state
 525          */
 526         batadv_gw_check_client_stop(bat_priv);
 527         atomic_set(&bat_priv->gw.mode, (unsigned int)gw_mode_tmp);
 528         batadv_gw_tvlv_container_update(bat_priv);
 529         return count;
 530 }
 531
 532 static ssize_t batadv_show_gw_sel_class(struct kobject *kobj,
 533                                         struct attribute *attr, char *buff)
 534 {
 535         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 536
 537         /* GW selection class is not available if the routing algorithm in use
 538          * does not implement the GW API
 539          */
 540         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 541             !bat_priv->algo_ops->gw.is_eligible)
 542                 return -ENOENT;
 543
 544         if (bat_priv->algo_ops->gw.show_sel_class)
 545                 return bat_priv->algo_ops->gw.show_sel_class(bat_priv, buff);
 546
 547         return sprintf(buff, "%i\n", atomic_read(&bat_priv->gw.sel_class));
 548 }
 549
 550 static ssize_t batadv_store_gw_sel_class(struct kobject *kobj,
 551                                          struct attribute *attr, char *buff,
 552                                          size_t count)
 553 {
 554         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 555
 556         /* setting the GW selection class is allowed only if the routing
 557          * algorithm in use implements the GW API
 558          */
 559         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 560             !bat_priv->algo_ops->gw.is_eligible)
 561                 return -EINVAL;
 562
 563         if (buff[count - 1] == '\n')
 564                 buff[count - 1] = '\0';
 565
 566         if (bat_priv->algo_ops->gw.store_sel_class)
 567                 return bat_priv->algo_ops->gw.store_sel_class(bat_priv, buff,
 568                                                               count);
 569
 570         return __batadv_store_uint_attr(buff, count, 1, BATADV_TQ_MAX_VALUE,
 571                                         batadv_post_gw_reselect, attr,
 572                                         &bat_priv->gw.sel_class,
 573                                         bat_priv->soft_iface);
 574 }
 575
 576 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 577                                      struct attribute *attr, char *buff)
 578 {
 579         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 580         u32 down, up;
 581
 582         down = atomic_read(&bat_priv->gw.bandwidth_down);
 583         up = atomic_read(&bat_priv->gw.bandwidth_up);
 584
 585         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 586                        down % 10, up / 10, up % 10);
 587 }
 588
 589 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 590                                       struct attribute *attr, char *buff,
 591                                       size_t count)
 592 {
 593         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 594
 595         if (buff[count - 1] == '\n')
 596                 buff[count - 1] = '\0';
 597
 598         return batadv_gw_bandwidth_set(net_dev, buff, count);
 599 }
 600
 601 /**
 602  * batadv_show_isolation_mark - print the current isolation mark/mask
 603  * @kobj: kobject representing the private mesh sysfs directory
 604  * @attr: the batman-adv attribute the user is interacting with
 605  * @buff: the buffer that will contain the data to send back to the user
 606  *
 607  * Return: the number of bytes written into 'buff' on success or a negative
 608  * error code in case of failure
 609  */
 610 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 611                                           struct attribute *attr, char *buff)
 612 {
 613         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 614
 615         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 616                        bat_priv->isolation_mark_mask);
 617 }
 618
 619 /**
 620  * batadv_store_isolation_mark - parse and store the isolation mark/mask entered
 621  *  by the user
 622  * @kobj: kobject representing the private mesh sysfs directory
 623  * @attr: the batman-adv attribute the user is interacting with
 624  * @buff: the buffer containing the user data
 625  * @count: number of bytes in the buffer
 626  *
 627  * Return: 'count' on success or a negative error code in case of failure
 628  */
 629 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 630                                            struct attribute *attr, char *buff,
 631                                            size_t count)
 632 {
 633         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 634         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 635         u32 mark, mask;
 636         char *mask_ptr;
 637
 638         /* parse the mask if it has been specified, otherwise assume the mask is
 639          * the biggest possible
 640          */
 641         mask = 0xFFFFFFFF;
 642         mask_ptr = strchr(buff, '/');
 643         if (mask_ptr) {
 644                 *mask_ptr = '\0';
 645                 mask_ptr++;
 646
 647                 /* the mask must be entered in hex base as it is going to be a
 648                  * bitmask and not a prefix length
 649                  */
 650                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 651                         return -EINVAL;
 652         }
 653
 654         /* the mark can be entered in any base */
 655         if (kstrtou32(buff, 0, &mark) < 0)
 656                 return -EINVAL;
 657
 658         bat_priv->isolation_mark_mask = mask;
 659         /* erase bits not covered by the mask */
 660         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 661
 662         batadv_info(net_dev,
 663                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 664                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 665
 666         return count;
 667 }
 668
 669 BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 670 BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 671 #ifdef CONFIG_BATMAN_ADV_BLA
 672 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR,
 673                      batadv_bla_status_update);
 674 #endif
 675 #ifdef CONFIG_BATMAN_ADV_DAT
 676 BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR,
 677                      batadv_dat_status_update);
 678 #endif
 679 BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
 680 static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
 681 static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
 682                    batadv_store_gw_mode);
 683 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR,
 684                      2 * BATADV_JITTER, INT_MAX, NULL);
 685 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0,
 686                      BATADV_TQ_MAX_VALUE, NULL);
 687 static BATADV_ATTR(gw_sel_class, S_IRUGO | S_IWUSR, batadv_show_gw_sel_class,
 688                    batadv_store_gw_sel_class);
 689 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 690                    batadv_store_gw_bwidth);
 691 #ifdef CONFIG_BATMAN_ADV_MCAST
 692 BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
 693 #endif
 694 #ifdef CONFIG_BATMAN_ADV_DEBUG
 695 BATADV_ATTR_SIF_UINT(log_level, log_level, S_IRUGO | S_IWUSR, 0,
 696                      BATADV_DBG_ALL, NULL);
 697 #endif
 698 #ifdef CONFIG_BATMAN_ADV_NC
 699 BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR,
 700                      batadv_nc_status_update);
 701 #endif
 702 static BATADV_ATTR(isolation_mark, S_IRUGO | S_IWUSR,
 703                    batadv_show_isolation_mark, batadv_store_isolation_mark);
 704
 705 static struct batadv_attribute *batadv_mesh_attrs[] = {
 706         &batadv_attr_aggregated_ogms,
 707         &batadv_attr_bonding,
 708 #ifdef CONFIG_BATMAN_ADV_BLA
 709         &batadv_attr_bridge_loop_avoidance,
 710 #endif
 711 #ifdef CONFIG_BATMAN_ADV_DAT
 712         &batadv_attr_distributed_arp_table,
 713 #endif
 714 #ifdef CONFIG_BATMAN_ADV_MCAST
 715         &batadv_attr_multicast_mode,
 716 #endif
 717         &batadv_attr_fragmentation,
 718         &batadv_attr_routing_algo,
 719         &batadv_attr_gw_mode,
 720         &batadv_attr_orig_interval,
 721         &batadv_attr_hop_penalty,
 722         &batadv_attr_gw_sel_class,
 723         &batadv_attr_gw_bandwidth,
 724 #ifdef CONFIG_BATMAN_ADV_DEBUG
 725         &batadv_attr_log_level,
 726 #endif
 727 #ifdef CONFIG_BATMAN_ADV_NC
 728         &batadv_attr_network_coding,
 729 #endif
 730         &batadv_attr_isolation_mark,
 731         NULL,
 732 };
 733
 734 BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
 735
 736 /* array of vlan specific sysfs attributes */
 737 static struct batadv_attribute *batadv_vlan_attrs[] = {
 738         &batadv_attr_vlan_ap_isolation,
 739         NULL,
 740 };
 741
 742 int batadv_sysfs_add_meshif(struct net_device *dev)
 743 {
 744         struct kobject *batif_kobject = &dev->dev.kobj;
 745         struct batadv_priv *bat_priv = netdev_priv(dev);
 746         struct batadv_attribute **bat_attr;
 747         int err;
 748
 749         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 750                                                     batif_kobject);
 751         if (!bat_priv->mesh_obj) {
 752                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 753                            BATADV_SYSFS_IF_MESH_SUBDIR);
 754                 goto out;
 755         }
 756
 757         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 758                 err = sysfs_create_file(bat_priv->mesh_obj,
 759                                         &((*bat_attr)->attr));
 760                 if (err) {
 761                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 762                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 763                                    ((*bat_attr)->attr).name);
 764                         goto rem_attr;
 765                 }
 766         }
 767
 768         return 0;
 769
 770 rem_attr:
 771         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 772                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 773
 774         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 775         kobject_del(bat_priv->mesh_obj);
 776         kobject_put(bat_priv->mesh_obj);
 777         bat_priv->mesh_obj = NULL;
 778 out:
 779         return -ENOMEM;
 780 }
 781
 782 void batadv_sysfs_del_meshif(struct net_device *dev)
 783 {
 784         struct batadv_priv *bat_priv = netdev_priv(dev);
 785         struct batadv_attribute **bat_attr;
 786
 787         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 788                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 789
 790         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 791         kobject_del(bat_priv->mesh_obj);
 792         kobject_put(bat_priv->mesh_obj);
 793         bat_priv->mesh_obj = NULL;
 794 }
 795
 796 /**
 797  * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan
 798  * @dev: netdev of the mesh interface
 799  * @vlan: private data of the newly added VLAN interface
 800  *
 801  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
 802  */
 803 int batadv_sysfs_add_vlan(struct net_device *dev,
 804                           struct batadv_softif_vlan *vlan)
 805 {
 806         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 807         struct batadv_priv *bat_priv = netdev_priv(dev);
 808         struct batadv_attribute **bat_attr;
 809         int err;
 810
 811         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 812                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 813                         vlan->vid & VLAN_VID_MASK);
 814
 815                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 816                                                     bat_priv->mesh_obj);
 817                 if (!vlan->kobj) {
 818                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 819                                    dev->name, vlan_subdir);
 820                         goto out;
 821                 }
 822         } else {
 823                 /* the untagged LAN uses the root folder to store its "VLAN
 824                  * specific attributes"
 825                  */
 826                 vlan->kobj = bat_priv->mesh_obj;
 827                 kobject_get(bat_priv->mesh_obj);
 828         }
 829
 830         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 831                 err = sysfs_create_file(vlan->kobj,
 832                                         &((*bat_attr)->attr));
 833                 if (err) {
 834                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 835                                    dev->name, vlan_subdir,
 836                                    ((*bat_attr)->attr).name);
 837                         goto rem_attr;
 838                 }
 839         }
 840
 841         return 0;
 842
 843 rem_attr:
 844         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 845                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 846
 847         if (vlan->kobj != bat_priv->mesh_obj) {
 848                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 849                 kobject_del(vlan->kobj);
 850         }
 851         kobject_put(vlan->kobj);
 852         vlan->kobj = NULL;
 853 out:
 854         return -ENOMEM;
 855 }
 856
 857 /**
 858  * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN
 859  * @bat_priv: the bat priv with all the soft interface information
 860  * @vlan: the private data of the VLAN to destroy
 861  */
 862 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 863                            struct batadv_softif_vlan *vlan)
 864 {
 865         struct batadv_attribute **bat_attr;
 866
 867         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 868                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 869
 870         if (vlan->kobj != bat_priv->mesh_obj) {
 871                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 872                 kobject_del(vlan->kobj);
 873         }
 874         kobject_put(vlan->kobj);
 875         vlan->kobj = NULL;
 876 }
 877
 878 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 879                                       struct attribute *attr, char *buff)
 880 {
 881         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 882         struct batadv_hard_iface *hard_iface;
 883         ssize_t length;
 884         const char *ifname;
 885
 886         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 887         if (!hard_iface)
 888                 return 0;
 889
 890         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 891                 ifname =  "none";
 892         else
 893                 ifname = hard_iface->soft_iface->name;
 894
 895         length = sprintf(buff, "%s\n", ifname);
 896
 897         batadv_hardif_put(hard_iface);
 898
 899         return length;
 900 }
 901
 902 /**
 903  * batadv_store_mesh_iface_finish - store new hardif mesh_iface state
 904  * @net_dev: netdevice to add/remove to/from batman-adv soft-interface
 905  * @ifname: name of soft-interface to modify
 906  *
 907  * Changes the parts of the hard+soft interface which can not be modified under
 908  * sysfs lock (to prevent deadlock situations).
 909  *
 910  * Return: 0 on success, 0 < on failure
 911  */
 912 static int batadv_store_mesh_iface_finish(struct net_device *net_dev,
 913                                           char ifname[IFNAMSIZ])
 914 {
 915         struct net *net = dev_net(net_dev);
 916         struct batadv_hard_iface *hard_iface;
 917         int status_tmp;
 918         int ret = 0;
 919
 920         ASSERT_RTNL();
 921
 922         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 923         if (!hard_iface)
 924                 return 0;
 925
 926         if (strncmp(ifname, "none", 4) == 0)
 927                 status_tmp = BATADV_IF_NOT_IN_USE;
 928         else
 929                 status_tmp = BATADV_IF_I_WANT_YOU;
 930
 931         if (hard_iface->if_status == status_tmp)
 932                 goto out;
 933
 934         if ((hard_iface->soft_iface) &&
 935             (strncmp(hard_iface->soft_iface->name, ifname, IFNAMSIZ) == 0))
 936                 goto out;
 937
 938         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 939                 batadv_hardif_disable_interface(hard_iface,
 940                                                 BATADV_IF_CLEANUP_AUTO);
 941                 goto out;
 942         }
 943
 944         /* if the interface already is in use */
 945         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 946                 batadv_hardif_disable_interface(hard_iface,
 947                                                 BATADV_IF_CLEANUP_AUTO);
 948
 949         ret = batadv_hardif_enable_interface(hard_iface, net, ifname);
 950 out:
 951         batadv_hardif_put(hard_iface);
 952         return ret;
 953 }
 954
 955 /**
 956  * batadv_store_mesh_iface_work - store new hardif mesh_iface state
 957  * @work: work queue item
 958  *
 959  * Changes the parts of the hard+soft interface which can not be modified under
 960  * sysfs lock (to prevent deadlock situations).
 961  */
 962 static void batadv_store_mesh_iface_work(struct work_struct *work)
 963 {
 964         struct batadv_store_mesh_work *store_work;
 965         int ret;
 966
 967         store_work = container_of(work, struct batadv_store_mesh_work, work);
 968
 969         rtnl_lock();
 970         ret = batadv_store_mesh_iface_finish(store_work->net_dev,
 971                                              store_work->soft_iface_name);
 972         rtnl_unlock();
 973
 974         if (ret < 0)
 975                 pr_err("Failed to store new mesh_iface state %s for %s: %d\n",
 976                        store_work->soft_iface_name, store_work->net_dev->name,
 977                        ret);
 978
 979         dev_put(store_work->net_dev);
 980         kfree(store_work);
 981 }
 982
 983 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 984                                        struct attribute *attr, char *buff,
 985                                        size_t count)
 986 {
 987         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 988         struct batadv_store_mesh_work *store_work;
 989
 990         if (buff[count - 1] == '\n')
 991                 buff[count - 1] = '\0';
 992
 993         if (strlen(buff) >= IFNAMSIZ) {
 994                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
 995                        buff);
 996                 return -EINVAL;
 997         }
 998
 999         store_work = kmalloc(sizeof(*store_work), GFP_KERNEL);
1000         if (!store_work)
1001                 return -ENOMEM;
1002
1003         dev_hold(net_dev);
1004         INIT_WORK(&store_work->work, batadv_store_mesh_iface_work);
1005         store_work->net_dev = net_dev;
1006         strlcpy(store_work->soft_iface_name, buff,
1007                 sizeof(store_work->soft_iface_name));
1008
1009         queue_work(batadv_event_workqueue, &store_work->work);
1010
1011         return count;
1012 }
1013
1014 static ssize_t batadv_show_iface_status(struct kobject *kobj,
1015                                         struct attribute *attr, char *buff)
1016 {
1017         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1018         struct batadv_hard_iface *hard_iface;
1019         ssize_t length;
1020
1021         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1022         if (!hard_iface)
1023                 return 0;
1024
1025         switch (hard_iface->if_status) {
1026         case BATADV_IF_TO_BE_REMOVED:
1027                 length = sprintf(buff, "disabling\n");
1028                 break;
1029         case BATADV_IF_INACTIVE:
1030                 length = sprintf(buff, "inactive\n");
1031                 break;
1032         case BATADV_IF_ACTIVE:
1033                 length = sprintf(buff, "active\n");
1034                 break;
1035         case BATADV_IF_TO_BE_ACTIVATED:
1036                 length = sprintf(buff, "enabling\n");
1037                 break;
1038         case BATADV_IF_NOT_IN_USE:
1039         default:
1040                 length = sprintf(buff, "not in use\n");
1041                 break;
1042         }
1043
1044         batadv_hardif_put(hard_iface);
1045
1046         return length;
1047 }
1048
1049 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1050
1051 /**
1052  * batadv_store_throughput_override - parse and store throughput override
1053  *  entered by the user
1054  * @kobj: kobject representing the private mesh sysfs directory
1055  * @attr: the batman-adv attribute the user is interacting with
1056  * @buff: the buffer containing the user data
1057  * @count: number of bytes in the buffer
1058  *
1059  * Return: 'count' on success or a negative error code in case of failure
1060  */
1061 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
1062                                                 struct attribute *attr,
1063                                                 char *buff, size_t count)
1064 {
1065         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1066         struct batadv_hard_iface *hard_iface;
1067         u32 tp_override;
1068         u32 old_tp_override;
1069         bool ret;
1070
1071         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1072         if (!hard_iface)
1073                 return -EINVAL;
1074
1075         if (buff[count - 1] == '\n')
1076                 buff[count - 1] = '\0';
1077
1078         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
1079                                       &tp_override);
1080         if (!ret)
1081                 return count;
1082
1083         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1084         if (old_tp_override == tp_override)
1085                 goto out;
1086
1087         batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n",
1088                     "throughput_override",
1089                     old_tp_override / 10, old_tp_override % 10,
1090                     tp_override / 10, tp_override % 10);
1091
1092         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
1093
1094 out:
1095         batadv_hardif_put(hard_iface);
1096         return count;
1097 }
1098
1099 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
1100                                                struct attribute *attr,
1101                                                char *buff)
1102 {
1103         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1104         struct batadv_hard_iface *hard_iface;
1105         u32 tp_override;
1106
1107         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1108         if (!hard_iface)
1109                 return -EINVAL;
1110
1111         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1112
1113         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
1114                        tp_override % 10);
1115 }
1116
1117 #endif
1118
1119 static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
1120                    batadv_store_mesh_iface);
1121 static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
1122 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1123 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, S_IRUGO | S_IWUSR,
1124                      2 * BATADV_JITTER, INT_MAX, NULL);
1125 static BATADV_ATTR(throughput_override, S_IRUGO | S_IWUSR,
1126                    batadv_show_throughput_override,
1127                    batadv_store_throughput_override);
1128 #endif
1129
1130 static struct batadv_attribute *batadv_batman_attrs[] = {
1131         &batadv_attr_mesh_iface,
1132         &batadv_attr_iface_status,
1133 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1134         &batadv_attr_elp_interval,
1135         &batadv_attr_throughput_override,
1136 #endif
1137         NULL,
1138 };
1139
1140 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1141 {
1142         struct kobject *hardif_kobject = &dev->dev.kobj;
1143         struct batadv_attribute **bat_attr;
1144         int err;
1145
1146         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1147                                              hardif_kobject);
1148
1149         if (!*hardif_obj) {
1150                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1151                            BATADV_SYSFS_IF_BAT_SUBDIR);
1152                 goto out;
1153         }
1154
1155         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1156                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1157                 if (err) {
1158                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1159                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1160                                    ((*bat_attr)->attr).name);
1161                         goto rem_attr;
1162                 }
1163         }
1164
1165         return 0;
1166
1167 rem_attr:
1168         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1169                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1170 out:
1171         return -ENOMEM;
1172 }
1173
1174 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1175 {
1176         kobject_uevent(*hardif_obj, KOBJ_REMOVE);
1177         kobject_del(*hardif_obj);
1178         kobject_put(*hardif_obj);
1179         *hardif_obj = NULL;
1180 }
1181
1182 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
1183                         enum batadv_uev_action action, const char *data)
1184 {
1185         int ret = -ENOMEM;
1186         struct kobject *bat_kobj;
1187         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
1188
1189         bat_kobj = &bat_priv->soft_iface->dev.kobj;
1190
1191         uevent_env[0] = kasprintf(GFP_ATOMIC,
1192                                   "%s%s", BATADV_UEV_TYPE_VAR,
1193                                   batadv_uev_type_str[type]);
1194         if (!uevent_env[0])
1195                 goto out;
1196
1197         uevent_env[1] = kasprintf(GFP_ATOMIC,
1198                                   "%s%s", BATADV_UEV_ACTION_VAR,
1199                                   batadv_uev_action_str[action]);
1200         if (!uevent_env[1])
1201                 goto out;
1202
1203         /* If the event is DEL, ignore the data field */
1204         if (action != BATADV_UEV_DEL) {
1205                 uevent_env[2] = kasprintf(GFP_ATOMIC,
1206                                           "%s%s", BATADV_UEV_DATA_VAR, data);
1207                 if (!uevent_env[2])
1208                         goto out;
1209         }
1210
1211         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
1212 out:
1213         kfree(uevent_env[0]);
1214         kfree(uevent_env[1]);
1215         kfree(uevent_env[2]);
1216
1217         if (ret)
1218                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1219                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
1220                            batadv_uev_type_str[type],
1221                            batadv_uev_action_str[action],
1222                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
1223         return ret;
1224 }