net/batman-adv/sysfs.c

   1 /* Copyright (C) 2010-2015 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/netdevice.h>
  30 #include <linux/printk.h>
  31 #include <linux/rculist.h>
  32 #include <linux/rcupdate.h>
  33 #include <linux/rtnetlink.h>
  34 #include <linux/slab.h>
  35 #include <linux/stat.h>
  36 #include <linux/stddef.h>
  37 #include <linux/string.h>
  38 #include <linux/stringify.h>
  39
  40 #include "distributed-arp-table.h"
  41 #include "gateway_client.h"
  42 #include "gateway_common.h"
  43 #include "bridge_loop_avoidance.h"
  44 #include "hard-interface.h"
  45 #include "network-coding.h"
  46 #include "packet.h"
  47 #include "soft-interface.h"
  48
  49 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  50 {
  51         struct device *dev = container_of(obj->parent, struct device, kobj);
  52
  53         return to_net_dev(dev);
  54 }
  55
  56 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  57 {
  58         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  59
  60         return netdev_priv(net_dev);
  61 }
  62
  63 /**
  64  * batadv_vlan_kobj_to_batpriv - convert a vlan kobj in the associated batpriv
  65  * @obj: kobject to covert
  66  *
  67  * Returns the associated batadv_priv struct.
  68  */
  69 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  70 {
  71         /* VLAN specific attributes are located in the root sysfs folder if they
  72          * refer to the untagged VLAN..
  73          */
  74         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  75                 return batadv_kobj_to_batpriv(obj);
  76
  77         /* ..while the attributes for the tagged vlans are located in
  78          * the in the corresponding "vlan%VID" subfolder
  79          */
  80         return batadv_kobj_to_batpriv(obj->parent);
  81 }
  82
  83 /**
  84  * batadv_kobj_to_vlan - convert a kobj in the associated softif_vlan struct
  85  * @obj: kobject to covert
  86  *
  87  * Returns the associated softif_vlan struct if found, NULL otherwise.
  88  */
  89 static struct batadv_softif_vlan *
  90 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  91 {
  92         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
  93
  94         rcu_read_lock();
  95         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
  96                 if (vlan_tmp->kobj != obj)
  97                         continue;
  98
  99                 if (!atomic_inc_not_zero(&vlan_tmp->refcount))
 100                         continue;
 101
 102                 vlan = vlan_tmp;
 103                 break;
 104         }
 105         rcu_read_unlock();
 106
 107         return vlan;
 108 }
 109
 110 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
 111 #define BATADV_UEV_ACTION_VAR   "BATACTION="
 112 #define BATADV_UEV_DATA_VAR     "BATDATA="
 113
 114 static char *batadv_uev_action_str[] = {
 115         "add",
 116         "del",
 117         "change"
 118 };
 119
 120 static char *batadv_uev_type_str[] = {
 121         "gw"
 122 };
 123
 124 /* Use this, if you have customized show and store functions for vlan attrs */
 125 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
 126 struct batadv_attribute batadv_attr_vlan_##_name = {    \
 127         .attr = {.name = __stringify(_name),            \
 128                  .mode = _mode },                       \
 129         .show   = _show,                                \
 130         .store  = _store,                               \
 131 }
 132
 133 /* Use this, if you have customized show and store functions */
 134 #define BATADV_ATTR(_name, _mode, _show, _store)        \
 135 struct batadv_attribute batadv_attr_##_name = {         \
 136         .attr = {.name = __stringify(_name),            \
 137                  .mode = _mode },                       \
 138         .show   = _show,                                \
 139         .store  = _store,                               \
 140 }
 141
 142 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
 143 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 144                              struct attribute *attr, char *buff,        \
 145                              size_t count)                              \
 146 {                                                                       \
 147         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 148         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 149                                                                         \
 150         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
 151                                         &bat_priv->_name, net_dev);     \
 152 }
 153
 154 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
 155 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 156                             struct attribute *attr, char *buff)         \
 157 {                                                                       \
 158         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 159                                                                         \
 160         return sprintf(buff, "%s\n",                                    \
 161                        atomic_read(&bat_priv->_name) == 0 ?             \
 162                        "disabled" : "enabled");                         \
 163 }                                                                       \
 164
 165 /* Use this, if you are going to turn a [name] in the soft-interface
 166  * (bat_priv) on or off
 167  */
 168 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
 169         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
 170         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
 171         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 172                            batadv_store_##_name)
 173
 174 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 175 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 176                              struct attribute *attr, char *buff,        \
 177                              size_t count)                              \
 178 {                                                                       \
 179         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 180         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 181                                                                         \
 182         return __batadv_store_uint_attr(buff, count, _min, _max,        \
 183                                         _post_func, attr,               \
 184                                         &bat_priv->_var, net_dev);      \
 185 }
 186
 187 #define BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                          \
 188 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 189                             struct attribute *attr, char *buff)         \
 190 {                                                                       \
 191         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 192                                                                         \
 193         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var));     \
 194 }                                                                       \
 195
 196 /* Use this, if you are going to set [name] in the soft-interface
 197  * (bat_priv) to an unsigned integer value
 198  */
 199 #define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 200         static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
 201         static BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                   \
 202         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 203                            batadv_store_##_name)
 204
 205 #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)                  \
 206 ssize_t batadv_store_vlan_##_name(struct kobject *kobj,                 \
 207                                   struct attribute *attr, char *buff,   \
 208                                   size_t count)                         \
 209 {                                                                       \
 210         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 211         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 212                                                               kobj);    \
 213         size_t res = __batadv_store_bool_attr(buff, count, _post_func,  \
 214                                               attr, &vlan->_name,       \
 215                                               bat_priv->soft_iface);    \
 216                                                                         \
 217         batadv_softif_vlan_free_ref(vlan);                              \
 218         return res;                                                     \
 219 }
 220
 221 #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)                               \
 222 ssize_t batadv_show_vlan_##_name(struct kobject *kobj,                  \
 223                                  struct attribute *attr, char *buff)    \
 224 {                                                                       \
 225         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 226         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 227                                                               kobj);    \
 228         size_t res = sprintf(buff, "%s\n",                              \
 229                              atomic_read(&vlan->_name) == 0 ?           \
 230                              "disabled" : "enabled");                   \
 231                                                                         \
 232         batadv_softif_vlan_free_ref(vlan);                              \
 233         return res;                                                     \
 234 }
 235
 236 /* Use this, if you are going to turn a [name] in the vlan struct on or off */
 237 #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)                 \
 238         static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)           \
 239         static BATADV_ATTR_VLAN_SHOW_BOOL(_name)                        \
 240         static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
 241                                 batadv_store_vlan_##_name)
 242
 243 static int batadv_store_bool_attr(char *buff, size_t count,
 244                                   struct net_device *net_dev,
 245                                   const char *attr_name, atomic_t *attr,
 246                                   bool *changed)
 247 {
 248         int enabled = -1;
 249
 250         *changed = false;
 251
 252         if (buff[count - 1] == '\n')
 253                 buff[count - 1] = '\0';
 254
 255         if ((strncmp(buff, "1", 2) == 0) ||
 256             (strncmp(buff, "enable", 7) == 0) ||
 257             (strncmp(buff, "enabled", 8) == 0))
 258                 enabled = 1;
 259
 260         if ((strncmp(buff, "0", 2) == 0) ||
 261             (strncmp(buff, "disable", 8) == 0) ||
 262             (strncmp(buff, "disabled", 9) == 0))
 263                 enabled = 0;
 264
 265         if (enabled < 0) {
 266                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 267                             attr_name, buff);
 268                 return -EINVAL;
 269         }
 270
 271         if (atomic_read(attr) == enabled)
 272                 return count;
 273
 274         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 275                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 276                     enabled == 1 ? "enabled" : "disabled");
 277
 278         *changed = true;
 279
 280         atomic_set(attr, (unsigned int)enabled);
 281         return count;
 282 }
 283
 284 static inline ssize_t
 285 __batadv_store_bool_attr(char *buff, size_t count,
 286                          void (*post_func)(struct net_device *),
 287                          struct attribute *attr,
 288                          atomic_t *attr_store, struct net_device *net_dev)
 289 {
 290         bool changed;
 291         int ret;
 292
 293         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 294                                      attr_store, &changed);
 295         if (post_func && changed)
 296                 post_func(net_dev);
 297
 298         return ret;
 299 }
 300
 301 static int batadv_store_uint_attr(const char *buff, size_t count,
 302                                   struct net_device *net_dev,
 303                                   const char *attr_name,
 304                                   unsigned int min, unsigned int max,
 305                                   atomic_t *attr)
 306 {
 307         unsigned long uint_val;
 308         int ret;
 309
 310         ret = kstrtoul(buff, 10, &uint_val);
 311         if (ret) {
 312                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 313                             attr_name, buff);
 314                 return -EINVAL;
 315         }
 316
 317         if (uint_val < min) {
 318                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 319                             attr_name, uint_val, min);
 320                 return -EINVAL;
 321         }
 322
 323         if (uint_val > max) {
 324                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 325                             attr_name, uint_val, max);
 326                 return -EINVAL;
 327         }
 328
 329         if (atomic_read(attr) == uint_val)
 330                 return count;
 331
 332         batadv_info(net_dev, "%s: Changing from: %i to: %lu\n",
 333                     attr_name, atomic_read(attr), uint_val);
 334
 335         atomic_set(attr, uint_val);
 336         return count;
 337 }
 338
 339 static inline ssize_t
 340 __batadv_store_uint_attr(const char *buff, size_t count,
 341                          int min, int max,
 342                          void (*post_func)(struct net_device *),
 343                          const struct attribute *attr,
 344                          atomic_t *attr_store, struct net_device *net_dev)
 345 {
 346         int ret;
 347
 348         ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
 349                                      attr_store);
 350         if (post_func && ret)
 351                 post_func(net_dev);
 352
 353         return ret;
 354 }
 355
 356 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 357                                     struct attribute *attr, char *buff)
 358 {
 359         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 360
 361         return sprintf(buff, "%s\n", bat_priv->bat_algo_ops->name);
 362 }
 363
 364 static void batadv_post_gw_reselect(struct net_device *net_dev)
 365 {
 366         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 367
 368         batadv_gw_reselect(bat_priv);
 369 }
 370
 371 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 372                                    char *buff)
 373 {
 374         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 375         int bytes_written;
 376
 377         switch (atomic_read(&bat_priv->gw_mode)) {
 378         case BATADV_GW_MODE_CLIENT:
 379                 bytes_written = sprintf(buff, "%s\n",
 380                                         BATADV_GW_MODE_CLIENT_NAME);
 381                 break;
 382         case BATADV_GW_MODE_SERVER:
 383                 bytes_written = sprintf(buff, "%s\n",
 384                                         BATADV_GW_MODE_SERVER_NAME);
 385                 break;
 386         default:
 387                 bytes_written = sprintf(buff, "%s\n",
 388                                         BATADV_GW_MODE_OFF_NAME);
 389                 break;
 390         }
 391
 392         return bytes_written;
 393 }
 394
 395 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 396                                     struct attribute *attr, char *buff,
 397                                     size_t count)
 398 {
 399         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 400         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 401         char *curr_gw_mode_str;
 402         int gw_mode_tmp = -1;
 403
 404         if (buff[count - 1] == '\n')
 405                 buff[count - 1] = '\0';
 406
 407         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 408                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 409                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 410
 411         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 412                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 413                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 414
 415         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 416                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 417                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 418
 419         if (gw_mode_tmp < 0) {
 420                 batadv_info(net_dev,
 421                             "Invalid parameter for 'gw mode' setting received: %s\n",
 422                             buff);
 423                 return -EINVAL;
 424         }
 425
 426         if (atomic_read(&bat_priv->gw_mode) == gw_mode_tmp)
 427                 return count;
 428
 429         switch (atomic_read(&bat_priv->gw_mode)) {
 430         case BATADV_GW_MODE_CLIENT:
 431                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 432                 break;
 433         case BATADV_GW_MODE_SERVER:
 434                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 435                 break;
 436         default:
 437                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 438                 break;
 439         }
 440
 441         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 442                     curr_gw_mode_str, buff);
 443
 444         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 445          * current GW. It will only instruct the gateway client code to perform
 446          * a re-election the next time that this is needed.
 447          *
 448          * When gw client mode is being switched off the current GW must be
 449          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 450          * client mode re-activation. This is operation is performed in
 451          * batadv_gw_check_client_stop().
 452          */
 453         batadv_gw_reselect(bat_priv);
 454         /* always call batadv_gw_check_client_stop() before changing the gateway
 455          * state
 456          */
 457         batadv_gw_check_client_stop(bat_priv);
 458         atomic_set(&bat_priv->gw_mode, (unsigned int)gw_mode_tmp);
 459         batadv_gw_tvlv_container_update(bat_priv);
 460         return count;
 461 }
 462
 463 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 464                                      struct attribute *attr, char *buff)
 465 {
 466         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 467         u32 down, up;
 468
 469         down = atomic_read(&bat_priv->gw.bandwidth_down);
 470         up = atomic_read(&bat_priv->gw.bandwidth_up);
 471
 472         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 473                        down % 10, up / 10, up % 10);
 474 }
 475
 476 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 477                                       struct attribute *attr, char *buff,
 478                                       size_t count)
 479 {
 480         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 481
 482         if (buff[count - 1] == '\n')
 483                 buff[count - 1] = '\0';
 484
 485         return batadv_gw_bandwidth_set(net_dev, buff, count);
 486 }
 487
 488 /**
 489  * batadv_show_isolation_mark - print the current isolation mark/mask
 490  * @kobj: kobject representing the private mesh sysfs directory
 491  * @attr: the batman-adv attribute the user is interacting with
 492  * @buff: the buffer that will contain the data to send back to the user
 493  *
 494  * Returns the number of bytes written into 'buff' on success or a negative
 495  * error code in case of failure
 496  */
 497 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 498                                           struct attribute *attr, char *buff)
 499 {
 500         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 501
 502         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 503                        bat_priv->isolation_mark_mask);
 504 }
 505
 506 /**
 507  * batadv_store_isolation_mark - parse and store the isolation mark/mask entered
 508  *  by the user
 509  * @kobj: kobject representing the private mesh sysfs directory
 510  * @attr: the batman-adv attribute the user is interacting with
 511  * @buff: the buffer containing the user data
 512  * @count: number of bytes in the buffer
 513  *
 514  * Returns 'count' on success or a negative error code in case of failure
 515  */
 516 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 517                                            struct attribute *attr, char *buff,
 518                                            size_t count)
 519 {
 520         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 521         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 522         u32 mark, mask;
 523         char *mask_ptr;
 524
 525         /* parse the mask if it has been specified, otherwise assume the mask is
 526          * the biggest possible
 527          */
 528         mask = 0xFFFFFFFF;
 529         mask_ptr = strchr(buff, '/');
 530         if (mask_ptr) {
 531                 *mask_ptr = '\0';
 532                 mask_ptr++;
 533
 534                 /* the mask must be entered in hex base as it is going to be a
 535                  * bitmask and not a prefix length
 536                  */
 537                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 538                         return -EINVAL;
 539         }
 540
 541         /* the mark can be entered in any base */
 542         if (kstrtou32(buff, 0, &mark) < 0)
 543                 return -EINVAL;
 544
 545         bat_priv->isolation_mark_mask = mask;
 546         /* erase bits not covered by the mask */
 547         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 548
 549         batadv_info(net_dev,
 550                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 551                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 552
 553         return count;
 554 }
 555
 556 BATADV_ATTR_SIF_BOOL(aggregated_ogms, S_IRUGO | S_IWUSR, NULL);
 557 BATADV_ATTR_SIF_BOOL(bonding, S_IRUGO | S_IWUSR, NULL);
 558 #ifdef CONFIG_BATMAN_ADV_BLA
 559 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, S_IRUGO | S_IWUSR,
 560                      batadv_bla_status_update);
 561 #endif
 562 #ifdef CONFIG_BATMAN_ADV_DAT
 563 BATADV_ATTR_SIF_BOOL(distributed_arp_table, S_IRUGO | S_IWUSR,
 564                      batadv_dat_status_update);
 565 #endif
 566 BATADV_ATTR_SIF_BOOL(fragmentation, S_IRUGO | S_IWUSR, batadv_update_min_mtu);
 567 static BATADV_ATTR(routing_algo, S_IRUGO, batadv_show_bat_algo, NULL);
 568 static BATADV_ATTR(gw_mode, S_IRUGO | S_IWUSR, batadv_show_gw_mode,
 569                    batadv_store_gw_mode);
 570 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, S_IRUGO | S_IWUSR,
 571                      2 * BATADV_JITTER, INT_MAX, NULL);
 572 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, S_IRUGO | S_IWUSR, 0,
 573                      BATADV_TQ_MAX_VALUE, NULL);
 574 BATADV_ATTR_SIF_UINT(gw_sel_class, gw_sel_class, S_IRUGO | S_IWUSR, 1,
 575                      BATADV_TQ_MAX_VALUE, batadv_post_gw_reselect);
 576 static BATADV_ATTR(gw_bandwidth, S_IRUGO | S_IWUSR, batadv_show_gw_bwidth,
 577                    batadv_store_gw_bwidth);
 578 #ifdef CONFIG_BATMAN_ADV_MCAST
 579 BATADV_ATTR_SIF_BOOL(multicast_mode, S_IRUGO | S_IWUSR, NULL);
 580 #endif
 581 #ifdef CONFIG_BATMAN_ADV_DEBUG
 582 BATADV_ATTR_SIF_UINT(log_level, log_level, S_IRUGO | S_IWUSR, 0,
 583                      BATADV_DBG_ALL, NULL);
 584 #endif
 585 #ifdef CONFIG_BATMAN_ADV_NC
 586 BATADV_ATTR_SIF_BOOL(network_coding, S_IRUGO | S_IWUSR,
 587                      batadv_nc_status_update);
 588 #endif
 589 static BATADV_ATTR(isolation_mark, S_IRUGO | S_IWUSR,
 590                    batadv_show_isolation_mark, batadv_store_isolation_mark);
 591
 592 static struct batadv_attribute *batadv_mesh_attrs[] = {
 593         &batadv_attr_aggregated_ogms,
 594         &batadv_attr_bonding,
 595 #ifdef CONFIG_BATMAN_ADV_BLA
 596         &batadv_attr_bridge_loop_avoidance,
 597 #endif
 598 #ifdef CONFIG_BATMAN_ADV_DAT
 599         &batadv_attr_distributed_arp_table,
 600 #endif
 601 #ifdef CONFIG_BATMAN_ADV_MCAST
 602         &batadv_attr_multicast_mode,
 603 #endif
 604         &batadv_attr_fragmentation,
 605         &batadv_attr_routing_algo,
 606         &batadv_attr_gw_mode,
 607         &batadv_attr_orig_interval,
 608         &batadv_attr_hop_penalty,
 609         &batadv_attr_gw_sel_class,
 610         &batadv_attr_gw_bandwidth,
 611 #ifdef CONFIG_BATMAN_ADV_DEBUG
 612         &batadv_attr_log_level,
 613 #endif
 614 #ifdef CONFIG_BATMAN_ADV_NC
 615         &batadv_attr_network_coding,
 616 #endif
 617         &batadv_attr_isolation_mark,
 618         NULL,
 619 };
 620
 621 BATADV_ATTR_VLAN_BOOL(ap_isolation, S_IRUGO | S_IWUSR, NULL);
 622
 623 /**
 624  * batadv_vlan_attrs - array of vlan specific sysfs attributes
 625  */
 626 static struct batadv_attribute *batadv_vlan_attrs[] = {
 627         &batadv_attr_vlan_ap_isolation,
 628         NULL,
 629 };
 630
 631 int batadv_sysfs_add_meshif(struct net_device *dev)
 632 {
 633         struct kobject *batif_kobject = &dev->dev.kobj;
 634         struct batadv_priv *bat_priv = netdev_priv(dev);
 635         struct batadv_attribute **bat_attr;
 636         int err;
 637
 638         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 639                                                     batif_kobject);
 640         if (!bat_priv->mesh_obj) {
 641                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 642                            BATADV_SYSFS_IF_MESH_SUBDIR);
 643                 goto out;
 644         }
 645
 646         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 647                 err = sysfs_create_file(bat_priv->mesh_obj,
 648                                         &((*bat_attr)->attr));
 649                 if (err) {
 650                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 651                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 652                                    ((*bat_attr)->attr).name);
 653                         goto rem_attr;
 654                 }
 655         }
 656
 657         return 0;
 658
 659 rem_attr:
 660         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 661                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 662
 663         kobject_put(bat_priv->mesh_obj);
 664         bat_priv->mesh_obj = NULL;
 665 out:
 666         return -ENOMEM;
 667 }
 668
 669 void batadv_sysfs_del_meshif(struct net_device *dev)
 670 {
 671         struct batadv_priv *bat_priv = netdev_priv(dev);
 672         struct batadv_attribute **bat_attr;
 673
 674         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 675                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 676
 677         kobject_put(bat_priv->mesh_obj);
 678         bat_priv->mesh_obj = NULL;
 679 }
 680
 681 /**
 682  * batadv_sysfs_add_vlan - add all the needed sysfs objects for the new vlan
 683  * @dev: netdev of the mesh interface
 684  * @vlan: private data of the newly added VLAN interface
 685  *
 686  * Returns 0 on success and -ENOMEM if any of the structure allocations fails.
 687  */
 688 int batadv_sysfs_add_vlan(struct net_device *dev,
 689                           struct batadv_softif_vlan *vlan)
 690 {
 691         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 692         struct batadv_priv *bat_priv = netdev_priv(dev);
 693         struct batadv_attribute **bat_attr;
 694         int err;
 695
 696         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 697                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 698                         vlan->vid & VLAN_VID_MASK);
 699
 700                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 701                                                     bat_priv->mesh_obj);
 702                 if (!vlan->kobj) {
 703                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 704                                    dev->name, vlan_subdir);
 705                         goto out;
 706                 }
 707         } else {
 708                 /* the untagged LAN uses the root folder to store its "VLAN
 709                  * specific attributes"
 710                  */
 711                 vlan->kobj = bat_priv->mesh_obj;
 712                 kobject_get(bat_priv->mesh_obj);
 713         }
 714
 715         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 716                 err = sysfs_create_file(vlan->kobj,
 717                                         &((*bat_attr)->attr));
 718                 if (err) {
 719                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 720                                    dev->name, vlan_subdir,
 721                                    ((*bat_attr)->attr).name);
 722                         goto rem_attr;
 723                 }
 724         }
 725
 726         return 0;
 727
 728 rem_attr:
 729         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 730                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 731
 732         kobject_put(vlan->kobj);
 733         vlan->kobj = NULL;
 734 out:
 735         return -ENOMEM;
 736 }
 737
 738 /**
 739  * batadv_sysfs_del_vlan - remove all the sysfs objects for a given VLAN
 740  * @bat_priv: the bat priv with all the soft interface information
 741  * @vlan: the private data of the VLAN to destroy
 742  */
 743 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 744                            struct batadv_softif_vlan *vlan)
 745 {
 746         struct batadv_attribute **bat_attr;
 747
 748         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 749                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 750
 751         kobject_put(vlan->kobj);
 752         vlan->kobj = NULL;
 753 }
 754
 755 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 756                                       struct attribute *attr, char *buff)
 757 {
 758         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 759         struct batadv_hard_iface *hard_iface;
 760         ssize_t length;
 761         const char *ifname;
 762
 763         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 764         if (!hard_iface)
 765                 return 0;
 766
 767         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 768                 ifname =  "none";
 769         else
 770                 ifname = hard_iface->soft_iface->name;
 771
 772         length = sprintf(buff, "%s\n", ifname);
 773
 774         batadv_hardif_free_ref(hard_iface);
 775
 776         return length;
 777 }
 778
 779 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
 780                                        struct attribute *attr, char *buff,
 781                                        size_t count)
 782 {
 783         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 784         struct batadv_hard_iface *hard_iface;
 785         int status_tmp = -1;
 786         int ret = count;
 787
 788         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 789         if (!hard_iface)
 790                 return count;
 791
 792         if (buff[count - 1] == '\n')
 793                 buff[count - 1] = '\0';
 794
 795         if (strlen(buff) >= IFNAMSIZ) {
 796                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
 797                        buff);
 798                 batadv_hardif_free_ref(hard_iface);
 799                 return -EINVAL;
 800         }
 801
 802         if (strncmp(buff, "none", 4) == 0)
 803                 status_tmp = BATADV_IF_NOT_IN_USE;
 804         else
 805                 status_tmp = BATADV_IF_I_WANT_YOU;
 806
 807         if (hard_iface->if_status == status_tmp)
 808                 goto out;
 809
 810         if ((hard_iface->soft_iface) &&
 811             (strncmp(hard_iface->soft_iface->name, buff, IFNAMSIZ) == 0))
 812                 goto out;
 813
 814         rtnl_lock();
 815
 816         if (status_tmp == BATADV_IF_NOT_IN_USE) {
 817                 batadv_hardif_disable_interface(hard_iface,
 818                                                 BATADV_IF_CLEANUP_AUTO);
 819                 goto unlock;
 820         }
 821
 822         /* if the interface already is in use */
 823         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
 824                 batadv_hardif_disable_interface(hard_iface,
 825                                                 BATADV_IF_CLEANUP_AUTO);
 826
 827         ret = batadv_hardif_enable_interface(hard_iface, buff);
 828
 829 unlock:
 830         rtnl_unlock();
 831 out:
 832         batadv_hardif_free_ref(hard_iface);
 833         return ret;
 834 }
 835
 836 static ssize_t batadv_show_iface_status(struct kobject *kobj,
 837                                         struct attribute *attr, char *buff)
 838 {
 839         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 840         struct batadv_hard_iface *hard_iface;
 841         ssize_t length;
 842
 843         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 844         if (!hard_iface)
 845                 return 0;
 846
 847         switch (hard_iface->if_status) {
 848         case BATADV_IF_TO_BE_REMOVED:
 849                 length = sprintf(buff, "disabling\n");
 850                 break;
 851         case BATADV_IF_INACTIVE:
 852                 length = sprintf(buff, "inactive\n");
 853                 break;
 854         case BATADV_IF_ACTIVE:
 855                 length = sprintf(buff, "active\n");
 856                 break;
 857         case BATADV_IF_TO_BE_ACTIVATED:
 858                 length = sprintf(buff, "enabling\n");
 859                 break;
 860         case BATADV_IF_NOT_IN_USE:
 861         default:
 862                 length = sprintf(buff, "not in use\n");
 863                 break;
 864         }
 865
 866         batadv_hardif_free_ref(hard_iface);
 867
 868         return length;
 869 }
 870
 871 static BATADV_ATTR(mesh_iface, S_IRUGO | S_IWUSR, batadv_show_mesh_iface,
 872                    batadv_store_mesh_iface);
 873 static BATADV_ATTR(iface_status, S_IRUGO, batadv_show_iface_status, NULL);
 874
 875 static struct batadv_attribute *batadv_batman_attrs[] = {
 876         &batadv_attr_mesh_iface,
 877         &batadv_attr_iface_status,
 878         NULL,
 879 };
 880
 881 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
 882 {
 883         struct kobject *hardif_kobject = &dev->dev.kobj;
 884         struct batadv_attribute **bat_attr;
 885         int err;
 886
 887         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
 888                                              hardif_kobject);
 889
 890         if (!*hardif_obj) {
 891                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 892                            BATADV_SYSFS_IF_BAT_SUBDIR);
 893                 goto out;
 894         }
 895
 896         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
 897                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
 898                 if (err) {
 899                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 900                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
 901                                    ((*bat_attr)->attr).name);
 902                         goto rem_attr;
 903                 }
 904         }
 905
 906         return 0;
 907
 908 rem_attr:
 909         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
 910                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
 911 out:
 912         return -ENOMEM;
 913 }
 914
 915 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
 916 {
 917         kobject_put(*hardif_obj);
 918         *hardif_obj = NULL;
 919 }
 920
 921 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
 922                         enum batadv_uev_action action, const char *data)
 923 {
 924         int ret = -ENOMEM;
 925         struct kobject *bat_kobj;
 926         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
 927
 928         bat_kobj = &bat_priv->soft_iface->dev.kobj;
 929
 930         uevent_env[0] = kasprintf(GFP_ATOMIC,
 931                                   "%s%s", BATADV_UEV_TYPE_VAR,
 932                                   batadv_uev_type_str[type]);
 933         if (!uevent_env[0])
 934                 goto out;
 935
 936         uevent_env[1] = kasprintf(GFP_ATOMIC,
 937                                   "%s%s", BATADV_UEV_ACTION_VAR,
 938                                   batadv_uev_action_str[action]);
 939         if (!uevent_env[1])
 940                 goto out;
 941
 942         /* If the event is DEL, ignore the data field */
 943         if (action != BATADV_UEV_DEL) {
 944                 uevent_env[2] = kasprintf(GFP_ATOMIC,
 945                                           "%s%s", BATADV_UEV_DATA_VAR, data);
 946                 if (!uevent_env[2])
 947                         goto out;
 948         }
 949
 950         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
 951 out:
 952         kfree(uevent_env[0]);
 953         kfree(uevent_env[1]);
 954         kfree(uevent_env[2]);
 955
 956         if (ret)
 957                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
 958                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
 959                            batadv_uev_type_str[type],
 960                            batadv_uev_action_str[action],
 961                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
 962         return ret;
 963 }