net/batman-adv/sysfs.c

   1 /* Copyright (C) 2010-2013 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, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17  * 02110-1301, USA
  18  */
  19
  20 #include "main.h"
  21 #include "sysfs.h"
  22 #include "translation-table.h"
  23 #include "distributed-arp-table.h"
  24 #include "originator.h"
  25 #include "hard-interface.h"
  26 #include "gateway_common.h"
  27 #include "gateway_client.h"
  28 #include "vis.h"
  29
  30 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  31 {
  32         struct device *dev = container_of(obj->parent, struct device, kobj);
  33         return to_net_dev(dev);
  34 }
  35
  36 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  37 {
  38         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  39         return netdev_priv(net_dev);
  40 }
  41
  42 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
  43 #define BATADV_UEV_ACTION_VAR   "BATACTION="
  44 #define BATADV_UEV_DATA_VAR     "BATDATA="
  45
  46 static char *batadv_uev_action_str[] = {
  47         "add",
  48         "del",
  49         "change"
  50 };
  51
  52 static char *batadv_uev_type_str[] = {
  53         "gw"
  54 };
  55
  56 /* Use this, if you have customized show and store functions */
  57 #define BATADV_ATTR(_name, _mode, _show, _store)        \
  58 struct batadv_attribute batadv_attr_##_name = {         \
  59         .attr = {.name = __stringify(_name),            \
  60                  .mode = _mode },                       \
  61         .show   = _show,                                \
  62         .store  = _store,                               \
  63 };
  64
  65 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
  66 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
  67                              struct attribute *attr, char *buff,        \
  68                              size_t count)                              \
  69 {                                                                       \
  70         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
  71         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
  72         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
  73                                         &bat_priv->_name, net_dev);     \
  74 }
  75
  76 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
  77 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
  78                             struct attribute *attr, char *buff)         \
  79 {                                                                       \
  80         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
  81         return sprintf(buff, "%s\n",                                    \
  82                        atomic_read(&bat_priv->_name) == 0 ?             \
  83                        "disabled" : "enabled");                         \
  84 }                                                                       \
  85
  86 /* Use this, if you are going to turn a [name] in the soft-interface
  87  * (bat_priv) on or off
  88  */
  89 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
  90         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
  91         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
  92         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
  93                            batadv_store_##_name)
  94
  95
  96 #define BATADV_ATTR_SIF_STORE_UINT(_name, _min, _max, _post_func)       \
  97 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
  98                              struct attribute *attr, char *buff,        \
  99                              size_t count)                              \
 100 {                                                                       \
 101         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 102         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 103         return __batadv_store_uint_attr(buff, count, _min, _max,        \
 104                                         _post_func, attr,               \
 105                                         &bat_priv->_name, net_dev);     \
 106 }
 107
 108 #define BATADV_ATTR_SIF_SHOW_UINT(_name)                                \
 109 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 110                             struct attribute *attr, char *buff)         \
 111 {                                                                       \
 112         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 113         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name));    \
 114 }                                                                       \
 115
 116 /* Use this, if you are going to set [name] in the soft-interface
 117  * (bat_priv) to an unsigned integer value
 118  */
 119 #define BATADV_ATTR_SIF_UINT(_name, _mode, _min, _max, _post_func)      \
 120         static BATADV_ATTR_SIF_STORE_UINT(_name, _min, _max, _post_func)\
 121         static BATADV_ATTR_SIF_SHOW_UINT(_name)                         \
 122         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 123                            batadv_store_##_name)
 124
 125
 126 static int batadv_store_bool_attr(char *buff, size_t count,
 127                                   struct net_device *net_dev,
 128                                   const char *attr_name, atomic_t *attr)
 129 {
 130         int enabled = -1;
 131
 132         if (buff[count - 1] == '\n')
 133                 buff[count - 1] = '\0';
 134
 135         if ((strncmp(buff, "1", 2) == 0) ||
 136             (strncmp(buff, "enable", 7) == 0) ||
 137             (strncmp(buff, "enabled", 8) == 0))
 138                 enabled = 1;
 139
 140         if ((strncmp(buff, "0", 2) == 0) ||
 141             (strncmp(buff, "disable", 8) == 0) ||
 142             (strncmp(buff, "disabled", 9) == 0))
 143                 enabled = 0;
 144
 145         if (enabled < 0) {
 146                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 147                             attr_name, buff);
 148                 return -EINVAL;
 149         }
 150
 151         if (atomic_read(attr) == enabled)
 152                 return count;
 153
 154         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 155                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 156                     enabled == 1 ? "enabled" : "disabled");
 157
 158         atomic_set(attr, (unsigned int)enabled);
 159         return count;
 160 }
 161
 162 static inline ssize_t
 163 __batadv_store_bool_attr(char *buff, size_t count,
 164                          void (*post_func)(struct net_device *),
 165                          struct attribute *attr,
 166                          atomic_t *attr_store, struct net_device *net_dev)
 167 {
 168         int ret;
 169
 170         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 171                                      attr_store);
 172         if (post_func && ret)
 173                 post_func(net_dev);
 174
 175         return ret;
 176 }
 177
 178 static int batadv_store_uint_attr(const char *buff, size_t count,
 179                                   struct net_device *net_dev,
 180                                   const char *attr_name,
 181                                   unsigned int min, unsigned int max,
 182                                   atomic_t *attr)
 183 {
 184         unsigned long uint_val;
 185         int ret;
 186
 187         ret = kstrtoul(buff, 10, &uint_val);
 188         if (ret) {
 189                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 190                             attr_name, buff);
 191                 return -EINVAL;
 192         }
 193
 194         if (uint_val < min) {
 195                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 196                             attr_name, uint_val, min);
 197                 return -EINVAL;
 198         }
 199
 200         if (uint_val > max) {
 201                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 202                             attr_name, uint_val, max);
 203                 return -EINVAL;
 204         }
 205
 206         if (atomic_read(attr) == uint_val)
 207                 return count;
 208
 209         batadv_info(net_dev, "%s: Changing from: %i to: %lu\n",
 210                     attr_name, atomic_read(attr), uint_val);
 211
 212         atomic_set(attr, uint_val);
 213         return count;
 214 }
 215
 216 static inline ssize_t
 217 __batadv_store_uint_attr(const char *buff, size_t count,
 218                          int min, int max,
 219                          void (*post_func)(struct net_device *),
 220                          const struct attribute *attr,
 221                          atomic_t *attr_store, struct net_device *net_dev)
 222 {
 223         int ret;
 224
 225         ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
 226                                      attr_store);
 227         if (post_func && ret)
 228                 post_func(net_dev);
 229
 230         return ret;
 231 }
 232
 233 static ssize_t batadv_show_vis_mode(struct kobject *kobj,
 234                                     struct attribute *attr, char *buff)
 235 {
 236         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 237         int vis_mode = atomic_read(&bat_priv->vis_mode);
 238         const char *mode;
 239
 240         if (vis_mode == BATADV_VIS_TYPE_CLIENT_UPDATE)
 241                 mode = "client";
 242         else
 243                 mode = "server";
 244
 245         return sprintf(buff, "%s\n", mode);
 246 }
 247
 248 static ssize_t batadv_store_vis_mode(struct kobject *kobj,
 249                                      struct attribute *attr, char *buff,
 250                                      size_t count)
 251 {
 252         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 253         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 254         unsigned long val;
 255         int ret, vis_mode_tmp = -1;
 256         const char *old_mode, *new_mode;
 257
 258         ret = kstrtoul(buff, 10, &val);
 259
 260         if (((count == 2) && (!ret) &&
 261              (val == BATADV_VIS_TYPE_CLIENT_UPDATE)) ||
 262             (strncmp(buff, "client", 6) == 0) ||
 263             (strncmp(buff, "off", 3) == 0))
 264                 vis_mode_tmp = BATADV_VIS_TYPE_CLIENT_UPDATE;
 265
 266         if (((count == 2) && (!ret) &&
 267              (val == BATADV_VIS_TYPE_SERVER_SYNC)) ||
 268             (strncmp(buff, "server", 6) == 0))
 269                 vis_mode_tmp = BATADV_VIS_TYPE_SERVER_SYNC;
 270
 271         if (vis_mode_tmp < 0) {
 272                 if (buff[count - 1] == '\n')
 273                         buff[count - 1] = '\0';
 274
 275                 batadv_info(net_dev,
 276                             "Invalid parameter for 'vis mode' setting received: %s\n",
 277                             buff);
 278                 return -EINVAL;
 279         }
 280
 281         if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp)
 282                 return count;
 283
 284         if (atomic_read(&bat_priv->vis_mode) == BATADV_VIS_TYPE_CLIENT_UPDATE)
 285                 old_mode =  "client";
 286         else
 287                 old_mode = "server";
 288
 289         if (vis_mode_tmp == BATADV_VIS_TYPE_CLIENT_UPDATE)
 290                 new_mode =  "client";
 291         else
 292                 new_mode = "server";
 293
 294         batadv_info(net_dev, "Changing vis mode from: %s to: %s\n", old_mode,
 295                     new_mode);
 296
 297         atomic_set(&bat_priv->vis_mode, (unsigned int)vis_mode_tmp);
 298         return count;
 299 }
 300
 301 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 302                                     struct attribute *attr, char *buff)
 303 {
 304         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 305         return sprintf(buff, "%s\n", bat_priv->bat_algo_ops->name);
 306 }
 307
 308 static void batadv_post_gw_deselect(struct net_device *net_dev)
 309 {
 310         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 311         batadv_gw_deselect(bat_priv);
 312 }
 313
 314 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 315                                    char *buff)
 316 {
 317         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 318         int bytes_written;
 319
 320         switch (atomic_read(&bat_priv->gw_mode)) {
 321         case BATADV_GW_MODE_CLIENT:
 322                 bytes_written = sprintf(buff, "%s\n",
 323                                         BATADV_GW_MODE_CLIENT_NAME);
 324                 break;
 325         case BATADV_GW_MODE_SERVER:
 326                 bytes_written = sprintf(buff, "%s\n",
 327                                         BATADV_GW_MODE_SERVER_NAME);
 328                 break;
 329         default:
 330                 bytes_written = sprintf(buff, "%s\n",
 331                                         BATADV_GW_MODE_OFF_NAME);
 332                 break;
 333         }
 334
 335         return bytes_written;
 336 }
 337
 338 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 339                                     struct attribute *attr, char *buff,
 340                                     size_t count)
 341 {
 342         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 343         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 344         char *curr_gw_mode_str;
 345         int gw_mode_tmp = -1;
 346
 347         if (buff[count - 1] == '\n')
 348                 buff[count - 1] = '\0';
 349
 350         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 351                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 352                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 353
 354         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 355                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 356                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 357
 358         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 359                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 360                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 361
 362         if (gw_mode_tmp < 0) {
 363                 batadv_info(net_dev,
 364                             "Invalid parameter for 'gw mode' setting received: %s\n",
 365                             buff);
 366                 return -EINVAL;
 367         }
 368
 369         if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
 370                 return count;
 371
 372         switch (atomic_read(&bat_priv->gw_mode)) {
 373         case BATADV_GW_MODE_CLIENT:
 374                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 375                 break;
 376         case BATADV_GW_MODE_SERVER:
 377                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 378                 break;
 379         default:
 380                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 381                 break;
 382         }
 383
 384         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 385                     curr_gw_mode_str, buff);
 386
 387         batadv_gw_deselect(bat_priv);
 388         atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp);
 389         return count;
 390 }
 391
 392 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 393                                      struct attribute *attr, char *buff)
 394 {
 395         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 396         int down, up;
 397         int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);
 398
 399         batadv_gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
 400         return sprintf(buff, "%i%s/%i%s\n",
 401                        (down > 2048 ? down / 1024 : down),
 402                        (down > 2048 ? "MBit" : "KBit"),
 403                        (up > 2048 ? up / 1024 : up),
 404                        (up > 2048 ? "MBit" : "KBit"));
 405 }
 406
 407 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 408                                       struct attribute *attr, char *buff,
 409                                       size_t count)
 410 {
 411         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 412
 413         if (buff[count - 1] == '\n')
 414                 buff[count - 1] = '\0';
 415
 416         return batadv_gw_bandwidth_set(net_dev, buff, count);
 417 }
 418
 419 BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 420 BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 421 #ifdef CONFIG_BATMAN_ADV_BLA
 422 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR, NULL);
 423 #endif
 424 #ifdef CONFIG_BATMAN_ADV_DAT
 425 BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR, NULL);
 426 #endif
 427 BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
 428 BATADV_ATTR_SIF_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
 429 static BATADV_ATTR(vis_mode, S_IRUGO | S_IWUSR, batadv_show_vis_mode,
 430                    batadv_store_vis_mode);
 431 static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
 432 static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
 433                    batadv_store_gw_mode);
 434 BATADV_ATTR_SIF_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * BATADV_JITTER,
 435                      INT_MAX, NULL);
 436 BATADV_ATTR_SIF_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, BATADV_TQ_MAX_VALUE,
 437                      NULL);
 438 BATADV_ATTR_SIF_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, BATADV_TQ_MAX_VALUE,
 439                      batadv_post_gw_deselect);
 440 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 441                    batadv_store_gw_bwidth);
 442 #ifdef CONFIG_BATMAN_ADV_DEBUG
 443 BATADV_ATTR_SIF_UINT(log_level, S_IRUGO | S_IWUSR, 0, BATADV_DBG_ALL, NULL);
 444 #endif
 445
 446 static struct batadv_attribute *batadv_mesh_attrs[] = {
 447         &batadv_attr_aggregated_ogms,
 448         &batadv_attr_bonding,
 449 #ifdef CONFIG_BATMAN_ADV_BLA
 450         &batadv_attr_bridge_loop_avoidance,
 451 #endif
 452 #ifdef CONFIG_BATMAN_ADV_DAT
 453         &batadv_attr_distributed_arp_table,
 454 #endif
 455         &batadv_attr_fragmentation,
 456         &batadv_attr_ap_isolation,
 457         &batadv_attr_vis_mode,
 458         &batadv_attr_routing_algo,
 459         &batadv_attr_gw_mode,
 460         &batadv_attr_orig_interval,
 461         &batadv_attr_hop_penalty,
 462         &batadv_attr_gw_sel_class,
 463         &batadv_attr_gw_bandwidth,
 464 #ifdef CONFIG_BATMAN_ADV_DEBUG
 465         &batadv_attr_log_level,
 466 #endif
 467         NULL,
 468 };
 469
 470 int batadv_sysfs_add_meshif(struct net_device *dev)
 471 {
 472         struct kobject *batif_kobject = &dev->dev.kobj;
 473         struct batadv_priv *bat_priv = netdev_priv(dev);
 474         struct batadv_attribute **bat_attr;
 475         int err;
 476
 477         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 478                                                     batif_kobject);
 479         if (!bat_priv->mesh_obj) {
 480                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 481                            BATADV_SYSFS_IF_MESH_SUBDIR);
 482                 goto out;
 483         }
 484
 485         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 486                 err = sysfs_create_file(bat_priv->mesh_obj,
 487                                         &((*bat_attr)->attr));
 488                 if (err) {
 489                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 490                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 491                                    ((*bat_attr)->attr).name);
 492                         goto rem_attr;
 493                 }
 494         }
 495
 496         return 0;
 497
 498 rem_attr:
 499         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 500                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 501
 502         kobject_put(bat_priv->mesh_obj);
 503         bat_priv->mesh_obj = NULL;
 504 out:
 505         return -ENOMEM;
 506 }
 507
 508 void batadv_sysfs_del_meshif(struct net_device *dev)
 509 {
 510         struct batadv_priv *bat_priv = netdev_priv(dev);
 511         struct batadv_attribute **bat_attr;
 512
 513         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 514                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 515
 516         kobject_put(bat_priv->mesh_obj);
 517         bat_priv->mesh_obj = NULL;
 518 }
 519
 520 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 521                                       struct attribute *attr, char *buff)
 522 {
 523         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 524         struct batadv_hard_iface *hard_iface;
 525         ssize_t length;
 526         const char *ifname;
 527
 528         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 529         if (!hard_iface)
 530                 return 0;
 531
 532         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 533                 ifname =  "none";
 534         else
 535                 ifname = hard_iface->soft_iface->name;
 536
 537         length = sprintf(buff, "%s\n", ifname);
 538
 539         batadv_hardif_free_ref(hard_iface);
 540
 541         return length;
 542 }
 543
 544 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 545                                        struct attribute *attr, char *buff,
 546                                        size_t count)
 547 {
 548         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 549         struct batadv_hard_iface *hard_iface;
 550         int status_tmp = -1;
 551         int ret = count;
 552
 553         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 554         if (!hard_iface)
 555                 return count;
 556
 557         if (buff[count - 1] == '\n')
 558                 buff[count - 1] = '\0';
 559
 560         if (strlen(buff) >= IFNAMSIZ) {
 561                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
 562                        buff);
 563                 batadv_hardif_free_ref(hard_iface);
 564                 return -EINVAL;
 565         }
 566
 567         if (strncmp(buff, "none", 4) == 0)
 568                 status_tmp = BATADV_IF_NOT_IN_USE;
 569         else
 570                 status_tmp = BATADV_IF_I_WANT_YOU;
 571
 572         if (hard_iface->if_status == status_tmp)
 573                 goto out;
 574
 575         if ((hard_iface->soft_iface) &&
 576             (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
 577                 goto out;
 578
 579         if (!rtnl_trylock()) {
 580                 ret = -ERESTARTSYS;
 581                 goto out;
 582         }
 583
 584         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 585                 batadv_hardif_disable_interface(hard_iface);
 586                 goto unlock;
 587         }
 588
 589         /* if the interface already is in use */
 590         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 591                 batadv_hardif_disable_interface(hard_iface);
 592
 593         ret = batadv_hardif_enable_interface(hard_iface, buff);
 594
 595 unlock:
 596         rtnl_unlock();
 597 out:
 598         batadv_hardif_free_ref(hard_iface);
 599         return ret;
 600 }
 601
 602 static ssize_t batadv_show_iface_status(struct kobject *kobj,
 603                                         struct attribute *attr, char *buff)
 604 {
 605         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 606         struct batadv_hard_iface *hard_iface;
 607         ssize_t length;
 608
 609         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 610         if (!hard_iface)
 611                 return 0;
 612
 613         switch (hard_iface->if_status) {
 614         case BATADV_IF_TO_BE_REMOVED:
 615                 length = sprintf(buff, "disabling\n");
 616                 break;
 617         case BATADV_IF_INACTIVE:
 618                 length = sprintf(buff, "inactive\n");
 619                 break;
 620         case BATADV_IF_ACTIVE:
 621                 length = sprintf(buff, "active\n");
 622                 break;
 623         case BATADV_IF_TO_BE_ACTIVATED:
 624                 length = sprintf(buff, "enabling\n");
 625                 break;
 626         case BATADV_IF_NOT_IN_USE:
 627         default:
 628                 length = sprintf(buff, "not in use\n");
 629                 break;
 630         }
 631
 632         batadv_hardif_free_ref(hard_iface);
 633
 634         return length;
 635 }
 636
 637 static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
 638                    batadv_store_mesh_iface);
 639 static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
 640
 641 static struct batadv_attribute *batadv_batman_attrs[] = {
 642         &batadv_attr_mesh_iface,
 643         &batadv_attr_iface_status,
 644         NULL,
 645 };
 646
 647 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
 648 {
 649         struct kobject *hardif_kobject = &dev->dev.kobj;
 650         struct batadv_attribute **bat_attr;
 651         int err;
 652
 653         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
 654                                              hardif_kobject);
 655
 656         if (!*hardif_obj) {
 657                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 658                            BATADV_SYSFS_IF_BAT_SUBDIR);
 659                 goto out;
 660         }
 661
 662         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
 663                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
 664                 if (err) {
 665                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 666                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
 667                                    ((*bat_attr)->attr).name);
 668                         goto rem_attr;
 669                 }
 670         }
 671
 672         return 0;
 673
 674 rem_attr:
 675         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
 676                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
 677 out:
 678         return -ENOMEM;
 679 }
 680
 681 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
 682 {
 683         kobject_put(*hardif_obj);
 684         *hardif_obj = NULL;
 685 }
 686
 687 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
 688                         enum batadv_uev_action action, const char *data)
 689 {
 690         int ret = -ENOMEM;
 691         struct batadv_hard_iface *primary_if;
 692         struct kobject *bat_kobj;
 693         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
 694
 695         primary_if = batadv_primary_if_get_selected(bat_priv);
 696         if (!primary_if)
 697                 goto out;
 698
 699         bat_kobj = &primary_if->soft_iface->dev.kobj;
 700
 701         uevent_env[0] = kmalloc(strlen(BATADV_UEV_TYPE_VAR) +
 702                                 strlen(batadv_uev_type_str[type]) + 1,
 703                                 GFP_ATOMIC);
 704         if (!uevent_env[0])
 705                 goto out;
 706
 707         sprintf(uevent_env[0], "%s%s", BATADV_UEV_TYPE_VAR,
 708                 batadv_uev_type_str[type]);
 709
 710         uevent_env[1] = kmalloc(strlen(BATADV_UEV_ACTION_VAR) +
 711                                 strlen(batadv_uev_action_str[action]) + 1,
 712                                 GFP_ATOMIC);
 713         if (!uevent_env[1])
 714                 goto out;
 715
 716         sprintf(uevent_env[1], "%s%s", BATADV_UEV_ACTION_VAR,
 717                 batadv_uev_action_str[action]);
 718
 719         /* If the event is DEL, ignore the data field */
 720         if (action != BATADV_UEV_DEL) {
 721                 uevent_env[2] = kmalloc(strlen(BATADV_UEV_DATA_VAR) +
 722                                         strlen(data) + 1, GFP_ATOMIC);
 723                 if (!uevent_env[2])
 724                         goto out;
 725
 726                 sprintf(uevent_env[2], "%s%s", BATADV_UEV_DATA_VAR, data);
 727         }
 728
 729         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
 730 out:
 731         kfree(uevent_env[0]);
 732         kfree(uevent_env[1]);
 733         kfree(uevent_env[2]);
 734
 735         if (primary_if)
 736                 batadv_hardif_free_ref(primary_if);
 737
 738         if (ret)
 739                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 740                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
 741                            batadv_uev_type_str[type],
 742                            batadv_uev_action_str[action],
 743                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
 744         return ret;
 745 }