net/batman-adv/bat_sysfs.c

   1 /*
   2  * Copyright (C) 2010-2011 B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of version 2 of the GNU General Public
   8  * License as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  18  * 02110-1301, USA
  19  *
  20  */
  21
  22 #include "main.h"
  23 #include "bat_sysfs.h"
  24 #include "translation-table.h"
  25 #include "originator.h"
  26 #include "hard-interface.h"
  27 #include "gateway_common.h"
  28 #include "gateway_client.h"
  29 #include "vis.h"
  30
  31 static struct net_device *kobj_to_netdev(struct kobject *obj)
  32 {
  33         struct device *dev = container_of(obj->parent, struct device, kobj);
  34         return to_net_dev(dev);
  35 }
  36
  37 static struct bat_priv *kobj_to_batpriv(struct kobject *obj)
  38 {
  39         struct net_device *net_dev = kobj_to_netdev(obj);
  40         return netdev_priv(net_dev);
  41 }
  42
  43 #define UEV_TYPE_VAR    "BATTYPE="
  44 #define UEV_ACTION_VAR  "BATACTION="
  45 #define UEV_DATA_VAR    "BATDATA="
  46
  47 static char *uev_action_str[] = {
  48         "add",
  49         "del",
  50         "change"
  51 };
  52
  53 static char *uev_type_str[] = {
  54         "gw"
  55 };
  56
  57 /* Use this, if you have customized show and store functions */
  58 #define BAT_ATTR(_name, _mode, _show, _store)   \
  59 struct bat_attribute bat_attr_##_name = {       \
  60         .attr = {.name = __stringify(_name),    \
  61                  .mode = _mode },               \
  62         .show   = _show,                        \
  63         .store  = _store,                       \
  64 };
  65
  66 #define BAT_ATTR_STORE_BOOL(_name, _post_func)                          \
  67 ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,     \
  68                       char *buff, size_t count)                         \
  69 {                                                                       \
  70         struct net_device *net_dev = kobj_to_netdev(kobj);              \
  71         struct bat_priv *bat_priv = netdev_priv(net_dev);               \
  72         return __store_bool_attr(buff, count, _post_func, attr,         \
  73                                  &bat_priv->_name, net_dev);            \
  74 }
  75
  76 #define BAT_ATTR_SHOW_BOOL(_name)                                       \
  77 ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,      \
  78                             char *buff)                                 \
  79 {                                                                       \
  80         struct bat_priv *bat_priv = 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 bat_priv on or off */
  87 #define BAT_ATTR_BOOL(_name, _mode, _post_func)                         \
  88         static BAT_ATTR_STORE_BOOL(_name, _post_func)                   \
  89         static BAT_ATTR_SHOW_BOOL(_name)                                \
  90         static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
  91
  92
  93 #define BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)              \
  94 ssize_t store_##_name(struct kobject *kobj, struct attribute *attr,     \
  95                              char *buff, size_t count)                  \
  96 {                                                                       \
  97         struct net_device *net_dev = kobj_to_netdev(kobj);              \
  98         struct bat_priv *bat_priv = netdev_priv(net_dev);               \
  99         return __store_uint_attr(buff, count, _min, _max, _post_func,   \
 100                                  attr, &bat_priv->_name, net_dev);      \
 101 }
 102
 103 #define BAT_ATTR_SHOW_UINT(_name)                                       \
 104 ssize_t show_##_name(struct kobject *kobj, struct attribute *attr,      \
 105                             char *buff)                                 \
 106 {                                                                       \
 107         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);              \
 108         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_name));    \
 109 }                                                                       \
 110
 111 /* Use this, if you are going to set [name] in bat_priv to unsigned integer
 112  * values only */
 113 #define BAT_ATTR_UINT(_name, _mode, _min, _max, _post_func)             \
 114         static BAT_ATTR_STORE_UINT(_name, _min, _max, _post_func)       \
 115         static BAT_ATTR_SHOW_UINT(_name)                                \
 116         static BAT_ATTR(_name, _mode, show_##_name, store_##_name)
 117
 118
 119 static int store_bool_attr(char *buff, size_t count,
 120                            struct net_device *net_dev,
 121                            const char *attr_name, atomic_t *attr)
 122 {
 123         int enabled = -1;
 124
 125         if (buff[count - 1] == '\n')
 126                 buff[count - 1] = '\0';
 127
 128         if ((strncmp(buff, "1", 2) == 0) ||
 129             (strncmp(buff, "enable", 7) == 0) ||
 130             (strncmp(buff, "enabled", 8) == 0))
 131                 enabled = 1;
 132
 133         if ((strncmp(buff, "0", 2) == 0) ||
 134             (strncmp(buff, "disable", 8) == 0) ||
 135             (strncmp(buff, "disabled", 9) == 0))
 136                 enabled = 0;
 137
 138         if (enabled < 0) {
 139                 bat_info(net_dev,
 140                          "%s: Invalid parameter received: %s\n",
 141                          attr_name, buff);
 142                 return -EINVAL;
 143         }
 144
 145         if (atomic_read(attr) == enabled)
 146                 return count;
 147
 148         bat_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 149                  atomic_read(attr) == 1 ? "enabled" : "disabled",
 150                  enabled == 1 ? "enabled" : "disabled");
 151
 152         atomic_set(attr, (unsigned)enabled);
 153         return count;
 154 }
 155
 156 static inline ssize_t __store_bool_attr(char *buff, size_t count,
 157                         void (*post_func)(struct net_device *),
 158                         struct attribute *attr,
 159                         atomic_t *attr_store, struct net_device *net_dev)
 160 {
 161         int ret;
 162
 163         ret = store_bool_attr(buff, count, net_dev, attr->name, attr_store);
 164         if (post_func && ret)
 165                 post_func(net_dev);
 166
 167         return ret;
 168 }
 169
 170 static int store_uint_attr(const char *buff, size_t count,
 171                            struct net_device *net_dev, const char *attr_name,
 172                            unsigned int min, unsigned int max, atomic_t *attr)
 173 {
 174         unsigned long uint_val;
 175         int ret;
 176
 177         ret = kstrtoul(buff, 10, &uint_val);
 178         if (ret) {
 179                 bat_info(net_dev,
 180                          "%s: Invalid parameter received: %s\n",
 181                          attr_name, buff);
 182                 return -EINVAL;
 183         }
 184
 185         if (uint_val < min) {
 186                 bat_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 187                          attr_name, uint_val, min);
 188                 return -EINVAL;
 189         }
 190
 191         if (uint_val > max) {
 192                 bat_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 193                          attr_name, uint_val, max);
 194                 return -EINVAL;
 195         }
 196
 197         if (atomic_read(attr) == uint_val)
 198                 return count;
 199
 200         bat_info(net_dev, "%s: Changing from: %i to: %lu\n",
 201                  attr_name, atomic_read(attr), uint_val);
 202
 203         atomic_set(attr, uint_val);
 204         return count;
 205 }
 206
 207 static inline ssize_t __store_uint_attr(const char *buff, size_t count,
 208                         int min, int max,
 209                         void (*post_func)(struct net_device *),
 210                         const struct attribute *attr,
 211                         atomic_t *attr_store, struct net_device *net_dev)
 212 {
 213         int ret;
 214
 215         ret = store_uint_attr(buff, count, net_dev, attr->name,
 216                               min, max, attr_store);
 217         if (post_func && ret)
 218                 post_func(net_dev);
 219
 220         return ret;
 221 }
 222
 223 static ssize_t show_vis_mode(struct kobject *kobj, struct attribute *attr,
 224                              char *buff)
 225 {
 226         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
 227         int vis_mode = atomic_read(&bat_priv->vis_mode);
 228
 229         return sprintf(buff, "%s\n",
 230                        vis_mode == VIS_TYPE_CLIENT_UPDATE ?
 231                                                         "client" : "server");
 232 }
 233
 234 static ssize_t store_vis_mode(struct kobject *kobj, struct attribute *attr,
 235                               char *buff, size_t count)
 236 {
 237         struct net_device *net_dev = kobj_to_netdev(kobj);
 238         struct bat_priv *bat_priv = netdev_priv(net_dev);
 239         unsigned long val;
 240         int ret, vis_mode_tmp = -1;
 241
 242         ret = kstrtoul(buff, 10, &val);
 243
 244         if (((count == 2) && (!ret) && (val == VIS_TYPE_CLIENT_UPDATE)) ||
 245             (strncmp(buff, "client", 6) == 0) ||
 246             (strncmp(buff, "off", 3) == 0))
 247                 vis_mode_tmp = VIS_TYPE_CLIENT_UPDATE;
 248
 249         if (((count == 2) && (!ret) && (val == VIS_TYPE_SERVER_SYNC)) ||
 250             (strncmp(buff, "server", 6) == 0))
 251                 vis_mode_tmp = VIS_TYPE_SERVER_SYNC;
 252
 253         if (vis_mode_tmp < 0) {
 254                 if (buff[count - 1] == '\n')
 255                         buff[count - 1] = '\0';
 256
 257                 bat_info(net_dev,
 258                          "Invalid parameter for 'vis mode' setting received: "
 259                          "%s\n", buff);
 260                 return -EINVAL;
 261         }
 262
 263         if (atomic_read(&bat_priv->vis_mode) == vis_mode_tmp)
 264                 return count;
 265
 266         bat_info(net_dev, "Changing vis mode from: %s to: %s\n",
 267                  atomic_read(&bat_priv->vis_mode) == VIS_TYPE_CLIENT_UPDATE ?
 268                  "client" : "server", vis_mode_tmp == VIS_TYPE_CLIENT_UPDATE ?
 269                  "client" : "server");
 270
 271         atomic_set(&bat_priv->vis_mode, (unsigned)vis_mode_tmp);
 272         return count;
 273 }
 274
 275 static void post_gw_deselect(struct net_device *net_dev)
 276 {
 277         struct bat_priv *bat_priv = netdev_priv(net_dev);
 278         gw_deselect(bat_priv);
 279 }
 280
 281 static ssize_t show_gw_mode(struct kobject *kobj, struct attribute *attr,
 282                             char *buff)
 283 {
 284         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
 285         int bytes_written;
 286
 287         switch (atomic_read(&bat_priv->gw_mode)) {
 288         case GW_MODE_CLIENT:
 289                 bytes_written = sprintf(buff, "%s\n", GW_MODE_CLIENT_NAME);
 290                 break;
 291         case GW_MODE_SERVER:
 292                 bytes_written = sprintf(buff, "%s\n", GW_MODE_SERVER_NAME);
 293                 break;
 294         default:
 295                 bytes_written = sprintf(buff, "%s\n", GW_MODE_OFF_NAME);
 296                 break;
 297         }
 298
 299         return bytes_written;
 300 }
 301
 302 static ssize_t store_gw_mode(struct kobject *kobj, struct attribute *attr,
 303                              char *buff, size_t count)
 304 {
 305         struct net_device *net_dev = kobj_to_netdev(kobj);
 306         struct bat_priv *bat_priv = netdev_priv(net_dev);
 307         char *curr_gw_mode_str;
 308         int gw_mode_tmp = -1;
 309
 310         if (buff[count - 1] == '\n')
 311                 buff[count - 1] = '\0';
 312
 313         if (strncmp(buff, GW_MODE_OFF_NAME, strlen(GW_MODE_OFF_NAME)) == 0)
 314                 gw_mode_tmp = GW_MODE_OFF;
 315
 316         if (strncmp(buff, GW_MODE_CLIENT_NAME,
 317                    strlen(GW_MODE_CLIENT_NAME)) == 0)
 318                 gw_mode_tmp = GW_MODE_CLIENT;
 319
 320         if (strncmp(buff, GW_MODE_SERVER_NAME,
 321                    strlen(GW_MODE_SERVER_NAME)) == 0)
 322                 gw_mode_tmp = GW_MODE_SERVER;
 323
 324         if (gw_mode_tmp < 0) {
 325                 bat_info(net_dev,
 326                          "Invalid parameter for 'gw mode' setting received: "
 327                          "%s\n", buff);
 328                 return -EINVAL;
 329         }
 330
 331         if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
 332                 return count;
 333
 334         switch (atomic_read(&bat_priv->gw_mode)) {
 335         case GW_MODE_CLIENT:
 336                 curr_gw_mode_str = GW_MODE_CLIENT_NAME;
 337                 break;
 338         case GW_MODE_SERVER:
 339                 curr_gw_mode_str = GW_MODE_SERVER_NAME;
 340                 break;
 341         default:
 342                 curr_gw_mode_str = GW_MODE_OFF_NAME;
 343                 break;
 344         }
 345
 346         bat_info(net_dev, "Changing gw mode from: %s to: %s\n",
 347                  curr_gw_mode_str, buff);
 348
 349         gw_deselect(bat_priv);
 350         atomic_set(&bat_priv->gw_mode, (unsigned)gw_mode_tmp);
 351         return count;
 352 }
 353
 354 static ssize_t show_gw_bwidth(struct kobject *kobj, struct attribute *attr,
 355                               char *buff)
 356 {
 357         struct bat_priv *bat_priv = kobj_to_batpriv(kobj);
 358         int down, up;
 359         int gw_bandwidth = atomic_read(&bat_priv->gw_bandwidth);
 360
 361         gw_bandwidth_to_kbit(gw_bandwidth, &down, &up);
 362         return sprintf(buff, "%i%s/%i%s\n",
 363                        (down > 2048 ? down / 1024 : down),
 364                        (down > 2048 ? "MBit" : "KBit"),
 365                        (up > 2048 ? up / 1024 : up),
 366                        (up > 2048 ? "MBit" : "KBit"));
 367 }
 368
 369 static ssize_t store_gw_bwidth(struct kobject *kobj, struct attribute *attr,
 370                                char *buff, size_t count)
 371 {
 372         struct net_device *net_dev = kobj_to_netdev(kobj);
 373
 374         if (buff[count - 1] == '\n')
 375                 buff[count - 1] = '\0';
 376
 377         return gw_bandwidth_set(net_dev, buff, count);
 378 }
 379
 380 BAT_ATTR_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 381 BAT_ATTR_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 382 BAT_ATTR_BOOL(fragmentation, S_IRUGO | S_IWUSR, update_min_mtu);
 383 BAT_ATTR_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
 384 static BAT_ATTR(vis_mode, S_IRUGO | S_IWUSR, show_vis_mode, store_vis_mode);
 385 static BAT_ATTR(gw_mode, S_IRUGO | S_IWUSR, show_gw_mode, store_gw_mode);
 386 BAT_ATTR_UINT(orig_interval, S_IRUGO | S_IWUSR, 2 * JITTER, INT_MAX, NULL);
 387 BAT_ATTR_UINT(hop_penalty, S_IRUGO | S_IWUSR, 0, TQ_MAX_VALUE, NULL);
 388 BAT_ATTR_UINT(gw_sel_class, S_IRUGO | S_IWUSR, 1, TQ_MAX_VALUE,
 389               post_gw_deselect);
 390 static BAT_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, show_gw_bwidth,
 391                 store_gw_bwidth);
 392 #ifdef CONFIG_BATMAN_ADV_DEBUG
 393 BAT_ATTR_UINT(log_level, S_IRUGO | S_IWUSR, 0, 7, NULL);
 394 #endif
 395
 396 static struct bat_attribute *mesh_attrs[] = {
 397         &bat_attr_aggregated_ogms,
 398         &bat_attr_bonding,
 399         &bat_attr_fragmentation,
 400         &bat_attr_ap_isolation,
 401         &bat_attr_vis_mode,
 402         &bat_attr_gw_mode,
 403         &bat_attr_orig_interval,
 404         &bat_attr_hop_penalty,
 405         &bat_attr_gw_sel_class,
 406         &bat_attr_gw_bandwidth,
 407 #ifdef CONFIG_BATMAN_ADV_DEBUG
 408         &bat_attr_log_level,
 409 #endif
 410         NULL,
 411 };
 412
 413 int sysfs_add_meshif(struct net_device *dev)
 414 {
 415         struct kobject *batif_kobject = &dev->dev.kobj;
 416         struct bat_priv *bat_priv = netdev_priv(dev);
 417         struct bat_attribute **bat_attr;
 418         int err;
 419
 420         bat_priv->mesh_obj = kobject_create_and_add(SYSFS_IF_MESH_SUBDIR,
 421                                                     batif_kobject);
 422         if (!bat_priv->mesh_obj) {
 423                 bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 424                         SYSFS_IF_MESH_SUBDIR);
 425                 goto out;
 426         }
 427
 428         for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr) {
 429                 err = sysfs_create_file(bat_priv->mesh_obj,
 430                                         &((*bat_attr)->attr));
 431                 if (err) {
 432                         bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 433                                 dev->name, SYSFS_IF_MESH_SUBDIR,
 434                                 ((*bat_attr)->attr).name);
 435                         goto rem_attr;
 436                 }
 437         }
 438
 439         return 0;
 440
 441 rem_attr:
 442         for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
 443                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 444
 445         kobject_put(bat_priv->mesh_obj);
 446         bat_priv->mesh_obj = NULL;
 447 out:
 448         return -ENOMEM;
 449 }
 450
 451 void sysfs_del_meshif(struct net_device *dev)
 452 {
 453         struct bat_priv *bat_priv = netdev_priv(dev);
 454         struct bat_attribute **bat_attr;
 455
 456         for (bat_attr = mesh_attrs; *bat_attr; ++bat_attr)
 457                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 458
 459         kobject_put(bat_priv->mesh_obj);
 460         bat_priv->mesh_obj = NULL;
 461 }
 462
 463 static ssize_t show_mesh_iface(struct kobject *kobj, struct attribute *attr,
 464                                char *buff)
 465 {
 466         struct net_device *net_dev = kobj_to_netdev(kobj);
 467         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 468         ssize_t length;
 469
 470         if (!hard_iface)
 471                 return 0;
 472
 473         length = sprintf(buff, "%s\n", hard_iface->if_status == IF_NOT_IN_USE ?
 474                          "none" : hard_iface->soft_iface->name);
 475
 476         hardif_free_ref(hard_iface);
 477
 478         return length;
 479 }
 480
 481 static ssize_t store_mesh_iface(struct kobject *kobj, struct attribute *attr,
 482                                 char *buff, size_t count)
 483 {
 484         struct net_device *net_dev = kobj_to_netdev(kobj);
 485         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 486         int status_tmp = -1;
 487         int ret = count;
 488
 489         if (!hard_iface)
 490                 return count;
 491
 492         if (buff[count - 1] == '\n')
 493                 buff[count - 1] = '\0';
 494
 495         if (strlen(buff) >= IFNAMSIZ) {
 496                 pr_err("Invalid parameter for 'mesh_iface' setting received: "
 497                        "interface name too long '%s'\n", buff);
 498                 hardif_free_ref(hard_iface);
 499                 return -EINVAL;
 500         }
 501
 502         if (strncmp(buff, "none", 4) == 0)
 503                 status_tmp = IF_NOT_IN_USE;
 504         else
 505                 status_tmp = IF_I_WANT_YOU;
 506
 507         if (hard_iface->if_status == status_tmp)
 508                 goto out;
 509
 510         if ((hard_iface->soft_iface) &&
 511             (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
 512                 goto out;
 513
 514         if (!rtnl_trylock()) {
 515                 ret = -ERESTARTSYS;
 516                 goto out;
 517         }
 518
 519         if (status_tmp == IF_NOT_IN_USE) {
 520                 hardif_disable_interface(hard_iface);
 521                 goto unlock;
 522         }
 523
 524         /* if the interface already is in use */
 525         if (hard_iface->if_status != IF_NOT_IN_USE)
 526                 hardif_disable_interface(hard_iface);
 527
 528         ret = hardif_enable_interface(hard_iface, buff);
 529
 530 unlock:
 531         rtnl_unlock();
 532 out:
 533         hardif_free_ref(hard_iface);
 534         return ret;
 535 }
 536
 537 static ssize_t show_iface_status(struct kobject *kobj, struct attribute *attr,
 538                                  char *buff)
 539 {
 540         struct net_device *net_dev = kobj_to_netdev(kobj);
 541         struct hard_iface *hard_iface = hardif_get_by_netdev(net_dev);
 542         ssize_t length;
 543
 544         if (!hard_iface)
 545                 return 0;
 546
 547         switch (hard_iface->if_status) {
 548         case IF_TO_BE_REMOVED:
 549                 length = sprintf(buff, "disabling\n");
 550                 break;
 551         case IF_INACTIVE:
 552                 length = sprintf(buff, "inactive\n");
 553                 break;
 554         case IF_ACTIVE:
 555                 length = sprintf(buff, "active\n");
 556                 break;
 557         case IF_TO_BE_ACTIVATED:
 558                 length = sprintf(buff, "enabling\n");
 559                 break;
 560         case IF_NOT_IN_USE:
 561         default:
 562                 length = sprintf(buff, "not in use\n");
 563                 break;
 564         }
 565
 566         hardif_free_ref(hard_iface);
 567
 568         return length;
 569 }
 570
 571 static BAT_ATTR(mesh_iface, S_IRUGO | S_IWUSR,
 572                 show_mesh_iface, store_mesh_iface);
 573 static BAT_ATTR(iface_status, S_IRUGO, show_iface_status, NULL);
 574
 575 static struct bat_attribute *batman_attrs[] = {
 576         &bat_attr_mesh_iface,
 577         &bat_attr_iface_status,
 578         NULL,
 579 };
 580
 581 int sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
 582 {
 583         struct kobject *hardif_kobject = &dev->dev.kobj;
 584         struct bat_attribute **bat_attr;
 585         int err;
 586
 587         *hardif_obj = kobject_create_and_add(SYSFS_IF_BAT_SUBDIR,
 588                                                     hardif_kobject);
 589
 590         if (!*hardif_obj) {
 591                 bat_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 592                         SYSFS_IF_BAT_SUBDIR);
 593                 goto out;
 594         }
 595
 596         for (bat_attr = batman_attrs; *bat_attr; ++bat_attr) {
 597                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
 598                 if (err) {
 599                         bat_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 600                                 dev->name, SYSFS_IF_BAT_SUBDIR,
 601                                 ((*bat_attr)->attr).name);
 602                         goto rem_attr;
 603                 }
 604         }
 605
 606         return 0;
 607
 608 rem_attr:
 609         for (bat_attr = batman_attrs; *bat_attr; ++bat_attr)
 610                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
 611 out:
 612         return -ENOMEM;
 613 }
 614
 615 void sysfs_del_hardif(struct kobject **hardif_obj)
 616 {
 617         kobject_put(*hardif_obj);
 618         *hardif_obj = NULL;
 619 }
 620
 621 int throw_uevent(struct bat_priv *bat_priv, enum uev_type type,
 622                  enum uev_action action, const char *data)
 623 {
 624         int ret = -1;
 625         struct hard_iface *primary_if = NULL;
 626         struct kobject *bat_kobj;
 627         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
 628
 629         primary_if = primary_if_get_selected(bat_priv);
 630         if (!primary_if)
 631                 goto out;
 632
 633         bat_kobj = &primary_if->soft_iface->dev.kobj;
 634
 635         uevent_env[0] = kmalloc(strlen(UEV_TYPE_VAR) +
 636                                 strlen(uev_type_str[type]) + 1,
 637                                 GFP_ATOMIC);
 638         if (!uevent_env[0])
 639                 goto out;
 640
 641         sprintf(uevent_env[0], "%s%s", UEV_TYPE_VAR, uev_type_str[type]);
 642
 643         uevent_env[1] = kmalloc(strlen(UEV_ACTION_VAR) +
 644                                 strlen(uev_action_str[action]) + 1,
 645                                 GFP_ATOMIC);
 646         if (!uevent_env[1])
 647                 goto out;
 648
 649         sprintf(uevent_env[1], "%s%s", UEV_ACTION_VAR, uev_action_str[action]);
 650
 651         /* If the event is DEL, ignore the data field */
 652         if (action != UEV_DEL) {
 653                 uevent_env[2] = kmalloc(strlen(UEV_DATA_VAR) +
 654                                         strlen(data) + 1, GFP_ATOMIC);
 655                 if (!uevent_env[2])
 656                         goto out;
 657
 658                 sprintf(uevent_env[2], "%s%s", UEV_DATA_VAR, data);
 659         }
 660
 661         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
 662 out:
 663         kfree(uevent_env[0]);
 664         kfree(uevent_env[1]);
 665         kfree(uevent_env[2]);
 666
 667         if (primary_if)
 668                 hardif_free_ref(primary_if);
 669
 670         if (ret)
 671                 bat_dbg(DBG_BATMAN, bat_priv, "Impossible to send "
 672                         "uevent for (%s,%s,%s) event (err: %d)\n",
 673                         uev_type_str[type], uev_action_str[action],
 674                         (action == UEV_DEL ? "NULL" : data), ret);
 675         return ret;
 676 }