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/kref.h>
  29 #include <linux/kernel.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 "distributed-arp-table.h"
  42 #include "gateway_client.h"
  43 #include "gateway_common.h"
  44 #include "bridge_loop_avoidance.h"
  45 #include "hard-interface.h"
  46 #include "network-coding.h"
  47 #include "packet.h"
  48 #include "soft-interface.h"
  49
  50 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  51 {
  52         struct device *dev = container_of(obj->parent, struct device, kobj);
  53
  54         return to_net_dev(dev);
  55 }
  56
  57 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  58 {
  59         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  60
  61         return netdev_priv(net_dev);
  62 }
  63
  64 /**
  65  * batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv
  66  * @obj: kobject to covert
  67  *
  68  * Return: the associated batadv_priv struct.
  69  */
  70 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  71 {
  72         /* VLAN specific attributes are located in the root sysfs folder if they
  73          * refer to the untagged VLAN..
  74          */
  75         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  76                 return batadv_kobj_to_batpriv(obj);
  77
  78         /* ..while the attributes for the tagged vlans are located in
  79          * the in the corresponding "vlan%VID" subfolder
  80          */
  81         return batadv_kobj_to_batpriv(obj->parent);
  82 }
  83
  84 /**
  85  * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct
  86  * @bat_priv: the bat priv with all the soft interface information
  87  * @obj: kobject to covert
  88  *
  89  * Return: the associated softif_vlan struct if found, NULL otherwise.
  90  */
  91 static struct batadv_softif_vlan *
  92 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  93 {
  94         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
  95
  96         rcu_read_lock();
  97         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
  98                 if (vlan_tmp->kobj != obj)
  99                         continue;
 100
 101                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
 102                         continue;
 103
 104                 vlan = vlan_tmp;
 105                 break;
 106         }
 107         rcu_read_unlock();
 108
 109         return vlan;
 110 }
 111
 112 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
 113 #define BATADV_UEV_ACTION_VAR   "BATACTION="
 114 #define BATADV_UEV_DATA_VAR     "BATDATA="
 115
 116 static char *batadv_uev_action_str[] = {
 117         "add",
 118         "del",
 119         "change",
 120         "loopdetect",
 121 };
 122
 123 static char *batadv_uev_type_str[] = {
 124         "gw",
 125         "bla",
 126 };
 127
 128 /* Use this, if you have customized show and store functions for vlan attrs */
 129 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
 130 struct batadv_attribute batadv_attr_vlan_##_name = {    \
 131         .attr = {.name = __stringify(_name),            \
 132                  .mode = _mode },                       \
 133         .show   = _show,                                \
 134         .store  = _store,                               \
 135 }
 136
 137 /* Use this, if you have customized show and store functions */
 138 #define BATADV_ATTR(_name, _mode, _show, _store)        \
 139 struct batadv_attribute batadv_attr_##_name = {         \
 140         .attr = {.name = __stringify(_name),            \
 141                  .mode = _mode },                       \
 142         .show   = _show,                                \
 143         .store  = _store,                               \
 144 }
 145
 146 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
 147 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 148                              struct attribute *attr, char *buff,        \
 149                              size_t count)                              \
 150 {                                                                       \
 151         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 152         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 153                                                                         \
 154         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
 155                                         &bat_priv->_name, net_dev);     \
 156 }
 157
 158 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
 159 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 160                             struct attribute *attr, char *buff)         \
 161 {                                                                       \
 162         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 163                                                                         \
 164         return sprintf(buff, "%s\n",                                    \
 165                        atomic_read(&bat_priv->_name) == 0 ?             \
 166                        "disabled" : "enabled");                         \
 167 }                                                                       \
 168
 169 /* Use this, if you are going to turn a [name] in the soft-interface
 170  * (bat_priv) on or off
 171  */
 172 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
 173         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
 174         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
 175         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 176                            batadv_store_##_name)
 177
 178 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 179 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 180                              struct attribute *attr, char *buff,        \
 181                              size_t count)                              \
 182 {                                                                       \
 183         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 184         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 185                                                                         \
 186         return __batadv_store_uint_attr(buff, count, _min, _max,        \
 187                                         _post_func, attr,               \
 188                                         &bat_priv->_var, net_dev);      \
 189 }
 190
 191 #define BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                          \
 192 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 193                             struct attribute *attr, char *buff)         \
 194 {                                                                       \
 195         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 196                                                                         \
 197         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var));     \
 198 }                                                                       \
 199
 200 /* Use this, if you are going to set [name] in the soft-interface
 201  * (bat_priv) to an unsigned integer value
 202  */
 203 #define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 204         static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
 205         static BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                   \
 206         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 207                            batadv_store_##_name)
 208
 209 #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)                  \
 210 ssize_t batadv_store_vlan_##_name(struct kobject *kobj,                 \
 211                                   struct attribute *attr, char *buff,   \
 212                                   size_t count)                         \
 213 {                                                                       \
 214         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 215         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 216                                                               kobj);    \
 217         size_t res = __batadv_store_bool_attr(buff, count, _post_func,  \
 218                                               attr, &vlan->_name,       \
 219                                               bat_priv->soft_iface);    \
 220                                                                         \
 221         batadv_softif_vlan_put(vlan);                                   \
 222         return res;                                                     \
 223 }
 224
 225 #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)                               \
 226 ssize_t batadv_show_vlan_##_name(struct kobject *kobj,                  \
 227                                  struct attribute *attr, char *buff)    \
 228 {                                                                       \
 229         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 230         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 231                                                               kobj);    \
 232         size_t res = sprintf(buff, "%s\n",                              \
 233                              atomic_read(&vlan->_name) == 0 ?           \
 234                              "disabled" : "enabled");                   \
 235                                                                         \
 236         batadv_softif_vlan_put(vlan);                                   \
 237         return res;                                                     \
 238 }
 239
 240 /* Use this, if you are going to turn a [name] in the vlan struct on or off */
 241 #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)                 \
 242         static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)           \
 243         static BATADV_ATTR_VLAN_SHOW_BOOL(_name)                        \
 244         static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
 245                                 batadv_store_vlan_##_name)
 246
 247 #define BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 248 ssize_t batadv_store_##_name(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_hard_iface *hard_iface;                           \
 254         ssize_t length;                                                 \
 255                                                                         \
 256         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 257         if (!hard_iface)                                                \
 258                 return 0;                                               \
 259                                                                         \
 260         length = __batadv_store_uint_attr(buff, count, _min, _max,      \
 261                                           _post_func, attr,             \
 262                                           &hard_iface->_var, net_dev);  \
 263                                                                         \
 264         batadv_hardif_put(hard_iface);                          \
 265         return length;                                                  \
 266 }
 267
 268 #define BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                          \
 269 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 270                             struct attribute *attr, char *buff)         \
 271 {                                                                       \
 272         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 273         struct batadv_hard_iface *hard_iface;                           \
 274         ssize_t length;                                                 \
 275                                                                         \
 276         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 277         if (!hard_iface)                                                \
 278                 return 0;                                               \
 279                                                                         \
 280         length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \
 281                                                                         \
 282         batadv_hardif_put(hard_iface);                          \
 283         return length;                                                  \
 284 }
 285
 286 /* Use this, if you are going to set [name] in hard_iface to an
 287  * unsigned integer value
 288  */
 289 #define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 290         static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min,            \
 291                                           _max, _post_func)             \
 292         static BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                   \
 293         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 294                            batadv_store_##_name)
 295
 296 static int batadv_store_bool_attr(char *buff, size_t count,
 297                                   struct net_device *net_dev,
 298                                   const char *attr_name, atomic_t *attr,
 299                                   bool *changed)
 300 {
 301         int enabled = -1;
 302
 303         *changed = false;
 304
 305         if (buff[count - 1] == '\n')
 306                 buff[count - 1] = '\0';
 307
 308         if ((strncmp(buff, "1", 2) == 0) ||
 309             (strncmp(buff, "enable", 7) == 0) ||
 310             (strncmp(buff, "enabled", 8) == 0))
 311                 enabled = 1;
 312
 313         if ((strncmp(buff, "0", 2) == 0) ||
 314             (strncmp(buff, "disable", 8) == 0) ||
 315             (strncmp(buff, "disabled", 9) == 0))
 316                 enabled = 0;
 317
 318         if (enabled < 0) {
 319                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 320                             attr_name, buff);
 321                 return -EINVAL;
 322         }
 323
 324         if (atomic_read(attr) == enabled)
 325                 return count;
 326
 327         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 328                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 329                     enabled == 1 ? "enabled" : "disabled");
 330
 331         *changed = true;
 332
 333         atomic_set(attr, (unsigned int)enabled);
 334         return count;
 335 }
 336
 337 static inline ssize_t
 338 __batadv_store_bool_attr(char *buff, size_t count,
 339                          void (*post_func)(struct net_device *),
 340                          struct attribute *attr,
 341                          atomic_t *attr_store, struct net_device *net_dev)
 342 {
 343         bool changed;
 344         int ret;
 345
 346         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 347                                      attr_store, &changed);
 348         if (post_func && changed)
 349                 post_func(net_dev);
 350
 351         return ret;
 352 }
 353
 354 static int batadv_store_uint_attr(const char *buff, size_t count,
 355                                   struct net_device *net_dev,
 356                                   const char *attr_name,
 357                                   unsigned int min, unsigned int max,
 358                                   atomic_t *attr)
 359 {
 360         unsigned long uint_val;
 361         int ret;
 362
 363         ret = kstrtoul(buff, 10, &uint_val);
 364         if (ret) {
 365                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 366                             attr_name, buff);
 367                 return -EINVAL;
 368         }
 369
 370         if (uint_val < min) {
 371                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 372                             attr_name, uint_val, min);
 373                 return -EINVAL;
 374         }
 375
 376         if (uint_val > max) {
 377                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 378                             attr_name, uint_val, max);
 379                 return -EINVAL;
 380         }
 381
 382         if (atomic_read(attr) == uint_val)
 383                 return count;
 384
 385         batadv_info(net_dev, "%s: Changing from: %i to: %lu\n",
 386                     attr_name, atomic_read(attr), uint_val);
 387
 388         atomic_set(attr, uint_val);
 389         return count;
 390 }
 391
 392 static inline ssize_t
 393 __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, struct net_device *net_dev)
 398 {
 399         int ret;
 400
 401         ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
 402                                      attr_store);
 403         if (post_func && ret)
 404                 post_func(net_dev);
 405
 406         return ret;
 407 }
 408
 409 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 410                                     struct attribute *attr, char *buff)
 411 {
 412         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 413
 414         return sprintf(buff, "%s\n", bat_priv->bat_algo_ops->name);
 415 }
 416
 417 static void batadv_post_gw_reselect(struct net_device *net_dev)
 418 {
 419         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 420
 421         batadv_gw_reselect(bat_priv);
 422 }
 423
 424 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 425                                    char *buff)
 426 {
 427         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 428         int bytes_written;
 429
 430         switch (atomic_read(&bat_priv->gw_mode)) {
 431         case BATADV_GW_MODE_CLIENT:
 432                 bytes_written = sprintf(buff, "%s\n",
 433                                         BATADV_GW_MODE_CLIENT_NAME);
 434                 break;
 435         case BATADV_GW_MODE_SERVER:
 436                 bytes_written = sprintf(buff, "%s\n",
 437                                         BATADV_GW_MODE_SERVER_NAME);
 438                 break;
 439         default:
 440                 bytes_written = sprintf(buff, "%s\n",
 441                                         BATADV_GW_MODE_OFF_NAME);
 442                 break;
 443         }
 444
 445         return bytes_written;
 446 }
 447
 448 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 449                                     struct attribute *attr, char *buff,
 450                                     size_t count)
 451 {
 452         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 453         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 454         char *curr_gw_mode_str;
 455         int gw_mode_tmp = -1;
 456
 457         if (buff[count - 1] == '\n')
 458                 buff[count - 1] = '\0';
 459
 460         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 461                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 462                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 463
 464         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 465                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 466                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 467
 468         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 469                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 470                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 471
 472         if (gw_mode_tmp < 0) {
 473                 batadv_info(net_dev,
 474                             "Invalid parameter for 'gw mode' setting received: %s\n",
 475                             buff);
 476                 return -EINVAL;
 477         }
 478
 479         if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
 480                 return count;
 481
 482         switch (atomic_read(&bat_priv->gw_mode)) {
 483         case BATADV_GW_MODE_CLIENT:
 484                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 485                 break;
 486         case BATADV_GW_MODE_SERVER:
 487                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 488                 break;
 489         default:
 490                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 491                 break;
 492         }
 493
 494         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 495                     curr_gw_mode_str, buff);
 496
 497         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 498          * current GW. It will only instruct the gateway client code to perform
 499          * a re-election the next time that this is needed.
 500          *
 501          * When gw client mode is being switched off the current GW must be
 502          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 503          * client mode re-activation. This is operation is performed in
 504          * batadv_gw_check_client_stop().
 505          */
 506         batadv_gw_reselect(bat_priv);
 507         /* always call batadv_gw_check_client_stop() before changing the gateway
 508          * state
 509          */
 510         batadv_gw_check_client_stop(bat_priv);
 511         atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp);
 512         batadv_gw_tvlv_container_update(bat_priv);
 513         return count;
 514 }
 515
 516 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 517                                      struct attribute *attr, char *buff)
 518 {
 519         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 520         u32 down, up;
 521
 522         down = atomic_read(&bat_priv->gw.bandwidth_down);
 523         up = atomic_read(&bat_priv->gw.bandwidth_up);
 524
 525         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 526                        down % 10, up / 10, up % 10);
 527 }
 528
 529 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 530                                       struct attribute *attr, char *buff,
 531                                       size_t count)
 532 {
 533         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 534
 535         if (buff[count - 1] == '\n')
 536                 buff[count - 1] = '\0';
 537
 538         return batadv_gw_bandwidth_set(net_dev, buff, count);
 539 }
 540
 541 /**
 542  * batadv_show_isolation_mark - print the current isolation mark/mask
 543  * @kobj: kobject representing the private mesh sysfs directory
 544  * @attr: the batman-adv attribute the user is interacting with
 545  * @buff: the buffer that will contain the data to send back to the user
 546  *
 547  * Return: the number of bytes written into 'buff' on success or a negative
 548  * error code in case of failure
 549  */
 550 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 551                                           struct attribute *attr, char *buff)
 552 {
 553         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 554
 555         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 556                        bat_priv->isolation_mark_mask);
 557 }
 558
 559 /**
 560  * batadv_store_isolation_mark - parse and store the isolation mark/mask entered
 561  *  by the user
 562  * @kobj: kobject representing the private mesh sysfs directory
 563  * @attr: the batman-adv attribute the user is interacting with
 564  * @buff: the buffer containing the user data
 565  * @count: number of bytes in the buffer
 566  *
 567  * Return: 'count' on success or a negative error code in case of failure
 568  */
 569 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 570                                            struct attribute *attr, char *buff,
 571                                            size_t count)
 572 {
 573         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 574         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 575         u32 mark, mask;
 576         char *mask_ptr;
 577
 578         /* parse the mask if it has been specified, otherwise assume the mask is
 579          * the biggest possible
 580          */
 581         mask = 0xFFFFFFFF;
 582         mask_ptr = strchr(buff, '/');
 583         if (mask_ptr) {
 584                 *mask_ptr = '\0';
 585                 mask_ptr++;
 586
 587                 /* the mask must be entered in hex base as it is going to be a
 588                  * bitmask and not a prefix length
 589                  */
 590                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 591                         return -EINVAL;
 592         }
 593
 594         /* the mark can be entered in any base */
 595         if (kstrtou32(buff, 0, &mark) < 0)
 596                 return -EINVAL;
 597
 598         bat_priv->isolation_mark_mask = mask;
 599         /* erase bits not covered by the mask */
 600         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 601
 602         batadv_info(net_dev,
 603                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 604                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 605
 606         return count;
 607 }
 608
 609 BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 610 BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 611 #ifdef CONFIG_BATMAN_ADV_BLA
 612 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR,
 613                      batadv_bla_status_update);
 614 #endif
 615 #ifdef CONFIG_BATMAN_ADV_DAT
 616 BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR,
 617                      batadv_dat_status_update);
 618 #endif
 619 BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
 620 static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
 621 static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
 622                    batadv_store_gw_mode);
 623 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR,
 624                      2 * BATADV_JITTER, INT_MAX, NULL);
 625 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0,
 626                      BATADV_TQ_MAX_VALUE, NULL);
 627 BATADV_ATTR_SIF_UINT(gw_sel_class, gw_sel_class, S_IRUGO | S_IWUSR, 1,
 628                      BATADV_TQ_MAX_VALUE, batadv_post_gw_reselect);
 629 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 630                    batadv_store_gw_bwidth);
 631 #ifdef CONFIG_BATMAN_ADV_MCAST
 632 BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
 633 #endif
 634 #ifdef CONFIG_BATMAN_ADV_DEBUG
 635 BATADV_ATTR_SIF_UINT(log_level, log_level, S_IRUGO | S_IWUSR, 0,
 636                      BATADV_DBG_ALL, NULL);
 637 #endif
 638 #ifdef CONFIG_BATMAN_ADV_NC
 639 BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR,
 640                      batadv_nc_status_update);
 641 #endif
 642 static BATADV_ATTR(isolation_mark, S_IRUGO | S_IWUSR,
 643                    batadv_show_isolation_mark, batadv_store_isolation_mark);
 644
 645 static struct batadv_attribute *batadv_mesh_attrs[] = {
 646         &batadv_attr_aggregated_ogms,
 647         &batadv_attr_bonding,
 648 #ifdef CONFIG_BATMAN_ADV_BLA
 649         &batadv_attr_bridge_loop_avoidance,
 650 #endif
 651 #ifdef CONFIG_BATMAN_ADV_DAT
 652         &batadv_attr_distributed_arp_table,
 653 #endif
 654 #ifdef CONFIG_BATMAN_ADV_MCAST
 655         &batadv_attr_multicast_mode,
 656 #endif
 657         &batadv_attr_fragmentation,
 658         &batadv_attr_routing_algo,
 659         &batadv_attr_gw_mode,
 660         &batadv_attr_orig_interval,
 661         &batadv_attr_hop_penalty,
 662         &batadv_attr_gw_sel_class,
 663         &batadv_attr_gw_bandwidth,
 664 #ifdef CONFIG_BATMAN_ADV_DEBUG
 665         &batadv_attr_log_level,
 666 #endif
 667 #ifdef CONFIG_BATMAN_ADV_NC
 668         &batadv_attr_network_coding,
 669 #endif
 670         &batadv_attr_isolation_mark,
 671         NULL,
 672 };
 673
 674 BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
 675
 676 /* array of vlan specific sysfs attributes */
 677 static struct batadv_attribute *batadv_vlan_attrs[] = {
 678         &batadv_attr_vlan_ap_isolation,
 679         NULL,
 680 };
 681
 682 int batadv_sysfs_add_meshif(struct net_device *dev)
 683 {
 684         struct kobject *batif_kobject = &dev->dev.kobj;
 685         struct batadv_priv *bat_priv = netdev_priv(dev);
 686         struct batadv_attribute **bat_attr;
 687         int err;
 688
 689         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 690                                                     batif_kobject);
 691         if (!bat_priv->mesh_obj) {
 692                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 693                            BATADV_SYSFS_IF_MESH_SUBDIR);
 694                 goto out;
 695         }
 696
 697         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 698                 err = sysfs_create_file(bat_priv->mesh_obj,
 699                                         &((*bat_attr)->attr));
 700                 if (err) {
 701                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 702                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 703                                    ((*bat_attr)->attr).name);
 704                         goto rem_attr;
 705                 }
 706         }
 707
 708         return 0;
 709
 710 rem_attr:
 711         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 712                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 713
 714         kobject_put(bat_priv->mesh_obj);
 715         bat_priv->mesh_obj = NULL;
 716 out:
 717         return -ENOMEM;
 718 }
 719
 720 void batadv_sysfs_del_meshif(struct net_device *dev)
 721 {
 722         struct batadv_priv *bat_priv = netdev_priv(dev);
 723         struct batadv_attribute **bat_attr;
 724
 725         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 726                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 727
 728         kobject_put(bat_priv->mesh_obj);
 729         bat_priv->mesh_obj = NULL;
 730 }
 731
 732 /**
 733  * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan
 734  * @dev: netdev of the mesh interface
 735  * @vlan: private data of the newly added VLAN interface
 736  *
 737  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
 738  */
 739 int batadv_sysfs_add_vlan(struct net_device *dev,
 740                           struct batadv_softif_vlan *vlan)
 741 {
 742         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 743         struct batadv_priv *bat_priv = netdev_priv(dev);
 744         struct batadv_attribute **bat_attr;
 745         int err;
 746
 747         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 748                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 749                         vlan->vid & VLAN_VID_MASK);
 750
 751                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 752                                                     bat_priv->mesh_obj);
 753                 if (!vlan->kobj) {
 754                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 755                                    dev->name, vlan_subdir);
 756                         goto out;
 757                 }
 758         } else {
 759                 /* the untagged LAN uses the root folder to store its "VLAN
 760                  * specific attributes"
 761                  */
 762                 vlan->kobj = bat_priv->mesh_obj;
 763                 kobject_get(bat_priv->mesh_obj);
 764         }
 765
 766         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 767                 err = sysfs_create_file(vlan->kobj,
 768                                         &((*bat_attr)->attr));
 769                 if (err) {
 770                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 771                                    dev->name, vlan_subdir,
 772                                    ((*bat_attr)->attr).name);
 773                         goto rem_attr;
 774                 }
 775         }
 776
 777         return 0;
 778
 779 rem_attr:
 780         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 781                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 782
 783         kobject_put(vlan->kobj);
 784         vlan->kobj = NULL;
 785 out:
 786         return -ENOMEM;
 787 }
 788
 789 /**
 790  * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN
 791  * @bat_priv: the bat priv with all the soft interface information
 792  * @vlan: the private data of the VLAN to destroy
 793  */
 794 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 795                            struct batadv_softif_vlan *vlan)
 796 {
 797         struct batadv_attribute **bat_attr;
 798
 799         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 800                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 801
 802         kobject_put(vlan->kobj);
 803         vlan->kobj = NULL;
 804 }
 805
 806 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 807                                       struct attribute *attr, char *buff)
 808 {
 809         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 810         struct batadv_hard_iface *hard_iface;
 811         ssize_t length;
 812         const char *ifname;
 813
 814         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 815         if (!hard_iface)
 816                 return 0;
 817
 818         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 819                 ifname =  "none";
 820         else
 821                 ifname = hard_iface->soft_iface->name;
 822
 823         length = sprintf(buff, "%s\n", ifname);
 824
 825         batadv_hardif_put(hard_iface);
 826
 827         return length;
 828 }
 829
 830 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 831                                        struct attribute *attr, char *buff,
 832                                        size_t count)
 833 {
 834         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 835         struct net *net = dev_net(net_dev);
 836         struct batadv_hard_iface *hard_iface;
 837         int status_tmp = -1;
 838         int ret = count;
 839
 840         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 841         if (!hard_iface)
 842                 return count;
 843
 844         if (buff[count - 1] == '\n')
 845                 buff[count - 1] = '\0';
 846
 847         if (strlen(buff) >= IFNAMSIZ) {
 848                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
 849                        buff);
 850                 batadv_hardif_put(hard_iface);
 851                 return -EINVAL;
 852         }
 853
 854         if (strncmp(buff, "none", 4) == 0)
 855                 status_tmp = BATADV_IF_NOT_IN_USE;
 856         else
 857                 status_tmp = BATADV_IF_I_WANT_YOU;
 858
 859         if (hard_iface->if_status == status_tmp)
 860                 goto out;
 861
 862         if ((hard_iface->soft_iface) &&
 863             (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
 864                 goto out;
 865
 866         rtnl_lock();
 867
 868         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 869                 batadv_hardif_disable_interface(hard_iface,
 870                                                 BATADV_IF_CLEANUP_AUTO);
 871                 goto unlock;
 872         }
 873
 874         /* if the interface already is in use */
 875         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 876                 batadv_hardif_disable_interface(hard_iface,
 877                                                 BATADV_IF_CLEANUP_AUTO);
 878
 879         ret = batadv_hardif_enable_interface(hard_iface, net, buff);
 880
 881 unlock:
 882         rtnl_unlock();
 883 out:
 884         batadv_hardif_put(hard_iface);
 885         return ret;
 886 }
 887
 888 static ssize_t batadv_show_iface_status(struct kobject *kobj,
 889                                         struct attribute *attr, char *buff)
 890 {
 891         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 892         struct batadv_hard_iface *hard_iface;
 893         ssize_t length;
 894
 895         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 896         if (!hard_iface)
 897                 return 0;
 898
 899         switch (hard_iface->if_status) {
 900         case BATADV_IF_TO_BE_REMOVED:
 901                 length = sprintf(buff, "disabling\n");
 902                 break;
 903         case BATADV_IF_INACTIVE:
 904                 length = sprintf(buff, "inactive\n");
 905                 break;
 906         case BATADV_IF_ACTIVE:
 907                 length = sprintf(buff, "active\n");
 908                 break;
 909         case BATADV_IF_TO_BE_ACTIVATED:
 910                 length = sprintf(buff, "enabling\n");
 911                 break;
 912         case BATADV_IF_NOT_IN_USE:
 913         default:
 914                 length = sprintf(buff, "not in use\n");
 915                 break;
 916         }
 917
 918         batadv_hardif_put(hard_iface);
 919
 920         return length;
 921 }
 922
 923 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 924
 925 /**
 926  * batadv_store_throughput_override - parse and store throughput override
 927  *  entered by the user
 928  * @kobj: kobject representing the private mesh sysfs directory
 929  * @attr: the batman-adv attribute the user is interacting with
 930  * @buff: the buffer containing the user data
 931  * @count: number of bytes in the buffer
 932  *
 933  * Return: 'count' on success or a negative error code in case of failure
 934  */
 935 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
 936                                                 struct attribute *attr,
 937                                                 char *buff, size_t count)
 938 {
 939         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 940         struct batadv_hard_iface *hard_iface;
 941         u32 tp_override;
 942         u32 old_tp_override;
 943         bool ret;
 944
 945         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 946         if (!hard_iface)
 947                 return -EINVAL;
 948
 949         if (buff[count - 1] == '\n')
 950                 buff[count - 1] = '\0';
 951
 952         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
 953                                       &tp_override);
 954         if (!ret)
 955                 return count;
 956
 957         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
 958         if (old_tp_override == tp_override)
 959                 goto out;
 960
 961         batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n",
 962                     "throughput_override",
 963                     old_tp_override / 10, old_tp_override % 10,
 964                     tp_override / 10, tp_override % 10);
 965
 966         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
 967
 968 out:
 969         batadv_hardif_put(hard_iface);
 970         return count;
 971 }
 972
 973 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
 974                                                struct attribute *attr,
 975                                                char *buff)
 976 {
 977         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 978         struct batadv_hard_iface *hard_iface;
 979         u32 tp_override;
 980
 981         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 982         if (!hard_iface)
 983                 return -EINVAL;
 984
 985         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
 986
 987         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
 988                        tp_override % 10);
 989 }
 990
 991 #endif
 992
 993 static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
 994                    batadv_store_mesh_iface);
 995 static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
 996 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
 997 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, S_IRUGO | S_IWUSR,
 998                      2 * BATADV_JITTER, INT_MAX, NULL);
 999 static BATADV_ATTR(throughput_override, S_IRUGO | S_IWUSR,
1000                    batadv_show_throughput_override,
1001                    batadv_store_throughput_override);
1002 #endif
1003
1004 static struct batadv_attribute *batadv_batman_attrs[] = {
1005         &batadv_attr_mesh_iface,
1006         &batadv_attr_iface_status,
1007 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1008         &batadv_attr_elp_interval,
1009         &batadv_attr_throughput_override,
1010 #endif
1011         NULL,
1012 };
1013
1014 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1015 {
1016         struct kobject *hardif_kobject = &dev->dev.kobj;
1017         struct batadv_attribute **bat_attr;
1018         int err;
1019
1020         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1021                                              hardif_kobject);
1022
1023         if (!*hardif_obj) {
1024                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1025                            BATADV_SYSFS_IF_BAT_SUBDIR);
1026                 goto out;
1027         }
1028
1029         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1030                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1031                 if (err) {
1032                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1033                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1034                                    ((*bat_attr)->attr).name);
1035                         goto rem_attr;
1036                 }
1037         }
1038
1039         return 0;
1040
1041 rem_attr:
1042         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1043                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1044 out:
1045         return -ENOMEM;
1046 }
1047
1048 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1049 {
1050         kobject_put(*hardif_obj);
1051         *hardif_obj = NULL;
1052 }
1053
1054 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
1055                         enum batadv_uev_action action, const char *data)
1056 {
1057         int ret = -ENOMEM;
1058         struct kobject *bat_kobj;
1059         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
1060
1061         bat_kobj = &bat_priv->soft_iface->dev.kobj;
1062
1063         uevent_env[0] = kasprintf(GFP_ATOMIC,
1064                                   "%s%s", BATADV_UEV_TYPE_VAR,
1065                                   batadv_uev_type_str[type]);
1066         if (!uevent_env[0])
1067                 goto out;
1068
1069         uevent_env[1] = kasprintf(GFP_ATOMIC,
1070                                   "%s%s", BATADV_UEV_ACTION_VAR,
1071                                   batadv_uev_action_str[action]);
1072         if (!uevent_env[1])
1073                 goto out;
1074
1075         /* If the event is DEL, ignore the data field */
1076         if (action != BATADV_UEV_DEL) {
1077                 uevent_env[2] = kasprintf(GFP_ATOMIC,
1078                                           "%s%s", BATADV_UEV_DATA_VAR, data);
1079                 if (!uevent_env[2])
1080                         goto out;
1081         }
1082
1083         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
1084 out:
1085         kfree(uevent_env[0]);
1086         kfree(uevent_env[1]);
1087         kfree(uevent_env[2]);
1088
1089         if (ret)
1090                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1091                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
1092                            batadv_uev_type_str[type],
1093                            batadv_uev_action_str[action],
1094                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
1095         return ret;
1096 }