net/batman-adv/sysfs.c

   1 /* Copyright (C) 2010-2016  B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "sysfs.h"
  19 #include "main.h"
  20
  21 #include <linux/atomic.h>
  22 #include <linux/compiler.h>
  23 #include <linux/device.h>
  24 #include <linux/errno.h>
  25 #include <linux/fs.h>
  26 #include <linux/if.h>
  27 #include <linux/if_vlan.h>
  28 #include <linux/kernel.h>
  29 #include <linux/kref.h>
  30 #include <linux/netdevice.h>
  31 #include <linux/printk.h>
  32 #include <linux/rculist.h>
  33 #include <linux/rcupdate.h>
  34 #include <linux/rtnetlink.h>
  35 #include <linux/slab.h>
  36 #include <linux/stat.h>
  37 #include <linux/stddef.h>
  38 #include <linux/string.h>
  39 #include <linux/stringify.h>
  40
  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         switch (atomic_read(&bat_priv->gw.mode)) {
 432         case BATADV_GW_MODE_CLIENT:
 433                 bytes_written = sprintf(buff, "%s\n",
 434                                         BATADV_GW_MODE_CLIENT_NAME);
 435                 break;
 436         case BATADV_GW_MODE_SERVER:
 437                 bytes_written = sprintf(buff, "%s\n",
 438                                         BATADV_GW_MODE_SERVER_NAME);
 439                 break;
 440         default:
 441                 bytes_written = sprintf(buff, "%s\n",
 442                                         BATADV_GW_MODE_OFF_NAME);
 443                 break;
 444         }
 445
 446         return bytes_written;
 447 }
 448
 449 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 450                                     struct attribute *attr, char *buff,
 451                                     size_t count)
 452 {
 453         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 454         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 455         char *curr_gw_mode_str;
 456         int gw_mode_tmp = -1;
 457
 458         if (buff[count - 1] == '\n')
 459                 buff[count - 1] = '\0';
 460
 461         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 462                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 463                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 464
 465         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 466                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 467                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 468
 469         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 470                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 471                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 472
 473         if (gw_mode_tmp < 0) {
 474                 batadv_info(net_dev,
 475                             "Invalid parameter for 'gw mode' setting received: %s\n",
 476                             buff);
 477                 return -EINVAL;
 478         }
 479
 480         if (atomic_read(&bat_priv->gw.mode) == gw_mode_tmp)
 481                 return count;
 482
 483         switch (atomic_read(&bat_priv->gw.mode)) {
 484         case BATADV_GW_MODE_CLIENT:
 485                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 486                 break;
 487         case BATADV_GW_MODE_SERVER:
 488                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 489                 break;
 490         default:
 491                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 492                 break;
 493         }
 494
 495         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 496                     curr_gw_mode_str, buff);
 497
 498         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 499          * current GW. It will only instruct the gateway client code to perform
 500          * a re-election the next time that this is needed.
 501          *
 502          * When gw client mode is being switched off the current GW must be
 503          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 504          * client mode re-activation. This is operation is performed in
 505          * batadv_gw_check_client_stop().
 506          */
 507         batadv_gw_reselect(bat_priv);
 508         /* always call batadv_gw_check_client_stop() before changing the gateway
 509          * state
 510          */
 511         batadv_gw_check_client_stop(bat_priv);
 512         atomic_set(&bat_priv->gw.mode, (unsigned int)gw_mode_tmp);
 513         batadv_gw_tvlv_container_update(bat_priv);
 514         return count;
 515 }
 516
 517 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 518                                      struct attribute *attr, char *buff)
 519 {
 520         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 521         u32 down, up;
 522
 523         down = atomic_read(&bat_priv->gw.bandwidth_down);
 524         up = atomic_read(&bat_priv->gw.bandwidth_up);
 525
 526         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 527                        down % 10, up / 10, up % 10);
 528 }
 529
 530 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 531                                       struct attribute *attr, char *buff,
 532                                       size_t count)
 533 {
 534         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 535
 536         if (buff[count - 1] == '\n')
 537                 buff[count - 1] = '\0';
 538
 539         return batadv_gw_bandwidth_set(net_dev, buff, count);
 540 }
 541
 542 /**
 543  * batadv_show_isolation_mark - print the current isolation mark/mask
 544  * @kobj: kobject representing the private mesh sysfs directory
 545  * @attr: the batman-adv attribute the user is interacting with
 546  * @buff: the buffer that will contain the data to send back to the user
 547  *
 548  * Return: the number of bytes written into 'buff' on success or a negative
 549  * error code in case of failure
 550  */
 551 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 552                                           struct attribute *attr, char *buff)
 553 {
 554         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 555
 556         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 557                        bat_priv->isolation_mark_mask);
 558 }
 559
 560 /**
 561  * batadv_store_isolation_mark - parse and store the isolation mark/mask entered
 562  *  by the user
 563  * @kobj: kobject representing the private mesh sysfs directory
 564  * @attr: the batman-adv attribute the user is interacting with
 565  * @buff: the buffer containing the user data
 566  * @count: number of bytes in the buffer
 567  *
 568  * Return: 'count' on success or a negative error code in case of failure
 569  */
 570 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 571                                            struct attribute *attr, char *buff,
 572                                            size_t count)
 573 {
 574         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 575         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 576         u32 mark, mask;
 577         char *mask_ptr;
 578
 579         /* parse the mask if it has been specified, otherwise assume the mask is
 580          * the biggest possible
 581          */
 582         mask = 0xFFFFFFFF;
 583         mask_ptr = strchr(buff, '/');
 584         if (mask_ptr) {
 585                 *mask_ptr = '\0';
 586                 mask_ptr++;
 587
 588                 /* the mask must be entered in hex base as it is going to be a
 589                  * bitmask and not a prefix length
 590                  */
 591                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 592                         return -EINVAL;
 593         }
 594
 595         /* the mark can be entered in any base */
 596         if (kstrtou32(buff, 0, &mark) < 0)
 597                 return -EINVAL;
 598
 599         bat_priv->isolation_mark_mask = mask;
 600         /* erase bits not covered by the mask */
 601         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 602
 603         batadv_info(net_dev,
 604                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 605                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 606
 607         return count;
 608 }
 609
 610 BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 611 BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 612 #ifdef CONFIG_BATMAN_ADV_BLA
 613 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR,
 614                      batadv_bla_status_update);
 615 #endif
 616 #ifdef CONFIG_BATMAN_ADV_DAT
 617 BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR,
 618                      batadv_dat_status_update);
 619 #endif
 620 BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
 621 static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
 622 static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
 623                    batadv_store_gw_mode);
 624 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR,
 625                      2 * BATADV_JITTER, INT_MAX, NULL);
 626 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0,
 627                      BATADV_TQ_MAX_VALUE, NULL);
 628 BATADV_ATTR_SIF_UINT(gw_sel_class, gw.sel_class, S_IRUGO | S_IWUSR, 1,
 629                      BATADV_TQ_MAX_VALUE, batadv_post_gw_reselect);
 630 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 631                    batadv_store_gw_bwidth);
 632 #ifdef CONFIG_BATMAN_ADV_MCAST
 633 BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
 634 #endif
 635 #ifdef CONFIG_BATMAN_ADV_DEBUG
 636 BATADV_ATTR_SIF_UINT(log_level, log_level, S_IRUGO | S_IWUSR, 0,
 637                      BATADV_DBG_ALL, NULL);
 638 #endif
 639 #ifdef CONFIG_BATMAN_ADV_NC
 640 BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR,
 641                      batadv_nc_status_update);
 642 #endif
 643 static BATADV_ATTR(isolation_mark, S_IRUGO | S_IWUSR,
 644                    batadv_show_isolation_mark, batadv_store_isolation_mark);
 645
 646 static struct batadv_attribute *batadv_mesh_attrs[] = {
 647         &batadv_attr_aggregated_ogms,
 648         &batadv_attr_bonding,
 649 #ifdef CONFIG_BATMAN_ADV_BLA
 650         &batadv_attr_bridge_loop_avoidance,
 651 #endif
 652 #ifdef CONFIG_BATMAN_ADV_DAT
 653         &batadv_attr_distributed_arp_table,
 654 #endif
 655 #ifdef CONFIG_BATMAN_ADV_MCAST
 656         &batadv_attr_multicast_mode,
 657 #endif
 658         &batadv_attr_fragmentation,
 659         &batadv_attr_routing_algo,
 660         &batadv_attr_gw_mode,
 661         &batadv_attr_orig_interval,
 662         &batadv_attr_hop_penalty,
 663         &batadv_attr_gw_sel_class,
 664         &batadv_attr_gw_bandwidth,
 665 #ifdef CONFIG_BATMAN_ADV_DEBUG
 666         &batadv_attr_log_level,
 667 #endif
 668 #ifdef CONFIG_BATMAN_ADV_NC
 669         &batadv_attr_network_coding,
 670 #endif
 671         &batadv_attr_isolation_mark,
 672         NULL,
 673 };
 674
 675 BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
 676
 677 /* array of vlan specific sysfs attributes */
 678 static struct batadv_attribute *batadv_vlan_attrs[] = {
 679         &batadv_attr_vlan_ap_isolation,
 680         NULL,
 681 };
 682
 683 int batadv_sysfs_add_meshif(struct net_device *dev)
 684 {
 685         struct kobject *batif_kobject = &dev->dev.kobj;
 686         struct batadv_priv *bat_priv = netdev_priv(dev);
 687         struct batadv_attribute **bat_attr;
 688         int err;
 689
 690         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 691                                                     batif_kobject);
 692         if (!bat_priv->mesh_obj) {
 693                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 694                            BATADV_SYSFS_IF_MESH_SUBDIR);
 695                 goto out;
 696         }
 697
 698         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 699                 err = sysfs_create_file(bat_priv->mesh_obj,
 700                                         &((*bat_attr)->attr));
 701                 if (err) {
 702                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 703                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 704                                    ((*bat_attr)->attr).name);
 705                         goto rem_attr;
 706                 }
 707         }
 708
 709         return 0;
 710
 711 rem_attr:
 712         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 713                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 714
 715         kobject_put(bat_priv->mesh_obj);
 716         bat_priv->mesh_obj = NULL;
 717 out:
 718         return -ENOMEM;
 719 }
 720
 721 void batadv_sysfs_del_meshif(struct net_device *dev)
 722 {
 723         struct batadv_priv *bat_priv = netdev_priv(dev);
 724         struct batadv_attribute **bat_attr;
 725
 726         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 727                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 728
 729         kobject_put(bat_priv->mesh_obj);
 730         bat_priv->mesh_obj = NULL;
 731 }
 732
 733 /**
 734  * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan
 735  * @dev: netdev of the mesh interface
 736  * @vlan: private data of the newly added VLAN interface
 737  *
 738  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
 739  */
 740 int batadv_sysfs_add_vlan(struct net_device *dev,
 741                           struct batadv_softif_vlan *vlan)
 742 {
 743         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 744         struct batadv_priv *bat_priv = netdev_priv(dev);
 745         struct batadv_attribute **bat_attr;
 746         int err;
 747
 748         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 749                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 750                         vlan->vid & VLAN_VID_MASK);
 751
 752                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 753                                                     bat_priv->mesh_obj);
 754                 if (!vlan->kobj) {
 755                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 756                                    dev->name, vlan_subdir);
 757                         goto out;
 758                 }
 759         } else {
 760                 /* the untagged LAN uses the root folder to store its "VLAN
 761                  * specific attributes"
 762                  */
 763                 vlan->kobj = bat_priv->mesh_obj;
 764                 kobject_get(bat_priv->mesh_obj);
 765         }
 766
 767         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 768                 err = sysfs_create_file(vlan->kobj,
 769                                         &((*bat_attr)->attr));
 770                 if (err) {
 771                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 772                                    dev->name, vlan_subdir,
 773                                    ((*bat_attr)->attr).name);
 774                         goto rem_attr;
 775                 }
 776         }
 777
 778         return 0;
 779
 780 rem_attr:
 781         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 782                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 783
 784         kobject_put(vlan->kobj);
 785         vlan->kobj = NULL;
 786 out:
 787         return -ENOMEM;
 788 }
 789
 790 /**
 791  * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN
 792  * @bat_priv: the bat priv with all the soft interface information
 793  * @vlan: the private data of the VLAN to destroy
 794  */
 795 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 796                            struct batadv_softif_vlan *vlan)
 797 {
 798         struct batadv_attribute **bat_attr;
 799
 800         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 801                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 802
 803         kobject_put(vlan->kobj);
 804         vlan->kobj = NULL;
 805 }
 806
 807 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 808                                       struct attribute *attr, char *buff)
 809 {
 810         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 811         struct batadv_hard_iface *hard_iface;
 812         ssize_t length;
 813         const char *ifname;
 814
 815         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 816         if (!hard_iface)
 817                 return 0;
 818
 819         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 820                 ifname =  "none";
 821         else
 822                 ifname = hard_iface->soft_iface->name;
 823
 824         length = sprintf(buff, "%s\n", ifname);
 825
 826         batadv_hardif_put(hard_iface);
 827
 828         return length;
 829 }
 830
 831 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 832                                        struct attribute *attr, char *buff,
 833                                        size_t count)
 834 {
 835         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 836         struct net *net = dev_net(net_dev);
 837         struct batadv_hard_iface *hard_iface;
 838         int status_tmp = -1;
 839         int ret = count;
 840
 841         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 842         if (!hard_iface)
 843                 return count;
 844
 845         if (buff[count - 1] == '\n')
 846                 buff[count - 1] = '\0';
 847
 848         if (strlen(buff) >= IFNAMSIZ) {
 849                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
 850                        buff);
 851                 batadv_hardif_put(hard_iface);
 852                 return -EINVAL;
 853         }
 854
 855         if (strncmp(buff, "none", 4) == 0)
 856                 status_tmp = BATADV_IF_NOT_IN_USE;
 857         else
 858                 status_tmp = BATADV_IF_I_WANT_YOU;
 859
 860         if (hard_iface->if_status == status_tmp)
 861                 goto out;
 862
 863         if ((hard_iface->soft_iface) &&
 864             (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
 865                 goto out;
 866
 867         rtnl_lock();
 868
 869         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 870                 batadv_hardif_disable_interface(hard_iface,
 871                                                 BATADV_IF_CLEANUP_AUTO);
 872                 goto unlock;
 873         }
 874
 875         /* if the interface already is in use */
 876         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 877                 batadv_hardif_disable_interface(hard_iface,
 878                                                 BATADV_IF_CLEANUP_AUTO);
 879
 880         ret = batadv_hardif_enable_interface(hard_iface, net, buff);
 881
 882 unlock:
 883         rtnl_unlock();
 884 out:
 885         batadv_hardif_put(hard_iface);
 886         return ret;
 887 }
 888
 889 static ssize_t batadv_show_iface_status(struct kobject *kobj,
 890                                         struct attribute *attr, char *buff)
 891 {
 892         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 893         struct batadv_hard_iface *hard_iface;
 894         ssize_t length;
 895
 896         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 897         if (!hard_iface)
 898                 return 0;
 899
 900         switch (hard_iface->if_status) {
 901         case BATADV_IF_TO_BE_REMOVED:
 902                 length = sprintf(buff, "disabling\n");
 903                 break;
 904         case BATADV_IF_INACTIVE:
 905                 length = sprintf(buff, "inactive\n");
 906                 break;
 907         case BATADV_IF_ACTIVE:
 908                 length = sprintf(buff, "active\n");
 909                 break;
 910         case BATADV_IF_TO_BE_ACTIVATED:
 911                 length = sprintf(buff, "enabling\n");
 912                 break;
 913         case BATADV_IF_NOT_IN_USE:
 914         default:
 915                 length = sprintf(buff, "not in use\n");
 916                 break;
 917         }
 918
 919         batadv_hardif_put(hard_iface);
 920
 921         return length;
 922 }
 923
 924 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 925
 926 /**
 927  * batadv_store_throughput_override - parse and store throughput override
 928  *  entered by the user
 929  * @kobj: kobject representing the private mesh sysfs directory
 930  * @attr: the batman-adv attribute the user is interacting with
 931  * @buff: the buffer containing the user data
 932  * @count: number of bytes in the buffer
 933  *
 934  * Return: 'count' on success or a negative error code in case of failure
 935  */
 936 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
 937                                                 struct attribute *attr,
 938                                                 char *buff, size_t count)
 939 {
 940         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 941         struct batadv_hard_iface *hard_iface;
 942         u32 tp_override;
 943         u32 old_tp_override;
 944         bool ret;
 945
 946         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 947         if (!hard_iface)
 948                 return -EINVAL;
 949
 950         if (buff[count - 1] == '\n')
 951                 buff[count - 1] = '\0';
 952
 953         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
 954                                       &tp_override);
 955         if (!ret)
 956                 return count;
 957
 958         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
 959         if (old_tp_override == tp_override)
 960                 goto out;
 961
 962         batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n",
 963                     "throughput_override",
 964                     old_tp_override / 10, old_tp_override % 10,
 965                     tp_override / 10, tp_override % 10);
 966
 967         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
 968
 969 out:
 970         batadv_hardif_put(hard_iface);
 971         return count;
 972 }
 973
 974 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
 975                                                struct attribute *attr,
 976                                                char *buff)
 977 {
 978         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 979         struct batadv_hard_iface *hard_iface;
 980         u32 tp_override;
 981
 982         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 983         if (!hard_iface)
 984                 return -EINVAL;
 985
 986         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
 987
 988         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
 989                        tp_override % 10);
 990 }
 991
 992 #endif
 993
 994 static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
 995                    batadv_store_mesh_iface);
 996 static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
 997 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 998 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, S_IRUGO | S_IWUSR,
 999                      2 * BATADV_JITTER, INT_MAX, NULL);
1000 static BATADV_ATTR(throughput_override, S_IRUGO | S_IWUSR,
1001                    batadv_show_throughput_override,
1002                    batadv_store_throughput_override);
1003 #endif
1004
1005 static struct batadv_attribute *batadv_batman_attrs[] = {
1006         &batadv_attr_mesh_iface,
1007         &batadv_attr_iface_status,
1008 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1009         &batadv_attr_elp_interval,
1010         &batadv_attr_throughput_override,
1011 #endif
1012         NULL,
1013 };
1014
1015 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1016 {
1017         struct kobject *hardif_kobject = &dev->dev.kobj;
1018         struct batadv_attribute **bat_attr;
1019         int err;
1020
1021         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1022                                              hardif_kobject);
1023
1024         if (!*hardif_obj) {
1025                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1026                            BATADV_SYSFS_IF_BAT_SUBDIR);
1027                 goto out;
1028         }
1029
1030         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1031                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1032                 if (err) {
1033                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1034                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1035                                    ((*bat_attr)->attr).name);
1036                         goto rem_attr;
1037                 }
1038         }
1039
1040         return 0;
1041
1042 rem_attr:
1043         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1044                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1045 out:
1046         return -ENOMEM;
1047 }
1048
1049 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1050 {
1051         kobject_put(*hardif_obj);
1052         *hardif_obj = NULL;
1053 }
1054
1055 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
1056                         enum batadv_uev_action action, const char *data)
1057 {
1058         int ret = -ENOMEM;
1059         struct kobject *bat_kobj;
1060         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
1061
1062         bat_kobj = &bat_priv->soft_iface->dev.kobj;
1063
1064         uevent_env[0] = kasprintf(GFP_ATOMIC,
1065                                   "%s%s", BATADV_UEV_TYPE_VAR,
1066                                   batadv_uev_type_str[type]);
1067         if (!uevent_env[0])
1068                 goto out;
1069
1070         uevent_env[1] = kasprintf(GFP_ATOMIC,
1071                                   "%s%s", BATADV_UEV_ACTION_VAR,
1072                                   batadv_uev_action_str[action]);
1073         if (!uevent_env[1])
1074                 goto out;
1075
1076         /* If the event is DEL, ignore the data field */
1077         if (action != BATADV_UEV_DEL) {
1078                 uevent_env[2] = kasprintf(GFP_ATOMIC,
1079                                           "%s%s", BATADV_UEV_DATA_VAR, data);
1080                 if (!uevent_env[2])
1081                         goto out;
1082         }
1083
1084         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
1085 out:
1086         kfree(uevent_env[0]);
1087         kfree(uevent_env[1]);
1088         kfree(uevent_env[2]);
1089
1090         if (ret)
1091                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1092                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
1093                            batadv_uev_type_str[type],
1094                            batadv_uev_action_str[action],
1095                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
1096         return ret;
1097 }