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