net/batman-adv/sysfs.c

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This source file includes following definitions.
batadv_sysfs_deprecated
batadv_kobj_to_netdev
batadv_kobj_to_batpriv
batadv_vlan_kobj_to_batpriv
batadv_kobj_to_vlan
batadv_store_bool_attr
__batadv_store_bool_attr
batadv_store_uint_attr
__batadv_store_uint_attr
batadv_show_bat_algo
batadv_post_gw_reselect
batadv_show_gw_mode
batadv_store_gw_mode
batadv_show_gw_sel_class
batadv_store_gw_sel_class
batadv_show_gw_bwidth
batadv_store_gw_bwidth
batadv_show_isolation_mark
batadv_store_isolation_mark
batadv_sysfs_add_meshif
batadv_sysfs_del_meshif
batadv_sysfs_add_vlan
batadv_sysfs_del_vlan
batadv_show_mesh_iface
batadv_store_mesh_iface_finish
batadv_store_mesh_iface_work
batadv_store_mesh_iface
batadv_show_iface_status
batadv_store_throughput_override
batadv_show_throughput_override
batadv_sysfs_add_hardif
batadv_sysfs_del_hardif
   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (C) 2010-2019  B.A.T.M.A.N. contributors:
   3  *
   4  * Marek Lindner
   5  */
   6 
   7 #include "sysfs.h"
   8 #include "main.h"
   9 
  10 #include <asm/current.h>
  11 #include <linux/atomic.h>
  12 #include <linux/compiler.h>
  13 #include <linux/device.h>
  14 #include <linux/errno.h>
  15 #include <linux/gfp.h>
  16 #include <linux/if.h>
  17 #include <linux/if_vlan.h>
  18 #include <linux/kernel.h>
  19 #include <linux/kobject.h>
  20 #include <linux/kref.h>
  21 #include <linux/limits.h>
  22 #include <linux/netdevice.h>
  23 #include <linux/printk.h>
  24 #include <linux/rculist.h>
  25 #include <linux/rcupdate.h>
  26 #include <linux/rtnetlink.h>
  27 #include <linux/sched.h>
  28 #include <linux/slab.h>
  29 #include <linux/stddef.h>
  30 #include <linux/string.h>
  31 #include <linux/stringify.h>
  32 #include <linux/workqueue.h>
  33 #include <uapi/linux/batadv_packet.h>
  34 #include <uapi/linux/batman_adv.h>
  35 
  36 #include "bridge_loop_avoidance.h"
  37 #include "distributed-arp-table.h"
  38 #include "gateway_client.h"
  39 #include "gateway_common.h"
  40 #include "hard-interface.h"
  41 #include "log.h"
  42 #include "netlink.h"
  43 #include "network-coding.h"
  44 #include "soft-interface.h"
  45 
  46 /**
  47  * batadv_sysfs_deprecated() - Log use of deprecated batadv sysfs access
  48  * @attr: attribute which was accessed
  49  */
  50 static void batadv_sysfs_deprecated(struct attribute *attr)
  51 {
  52         pr_warn_ratelimited(DEPRECATED "%s (pid %d) Use of sysfs file \"%s\".\nUse batadv genl family instead",
  53                             current->comm, task_pid_nr(current), attr->name);
  54 }
  55 
  56 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
  57 {
  58         struct device *dev = container_of(obj->parent, struct device, kobj);
  59 
  60         return to_net_dev(dev);
  61 }
  62 
  63 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
  64 {
  65         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
  66 
  67         return netdev_priv(net_dev);
  68 }
  69 
  70 /**
  71  * batadv_vlan_kobj_to_batpriv() - convert a vlan kobj in the associated batpriv
  72  * @obj: kobject to covert
  73  *
  74  * Return: the associated batadv_priv struct.
  75  */
  76 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
  77 {
  78         /* VLAN specific attributes are located in the root sysfs folder if they
  79          * refer to the untagged VLAN..
  80          */
  81         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
  82                 return batadv_kobj_to_batpriv(obj);
  83 
  84         /* ..while the attributes for the tagged vlans are located in
  85          * the in the corresponding "vlan%VID" subfolder
  86          */
  87         return batadv_kobj_to_batpriv(obj->parent);
  88 }
  89 
  90 /**
  91  * batadv_kobj_to_vlan() - convert a kobj in the associated softif_vlan struct
  92  * @bat_priv: the bat priv with all the soft interface information
  93  * @obj: kobject to covert
  94  *
  95  * Return: the associated softif_vlan struct if found, NULL otherwise.
  96  */
  97 static struct batadv_softif_vlan *
  98 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
  99 {
 100         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 101 
 102         rcu_read_lock();
 103         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
 104                 if (vlan_tmp->kobj != obj)
 105                         continue;
 106 
 107                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
 108                         continue;
 109 
 110                 vlan = vlan_tmp;
 111                 break;
 112         }
 113         rcu_read_unlock();
 114 
 115         return vlan;
 116 }
 117 
 118 /* Use this, if you have customized show and store functions for vlan attrs */
 119 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
 120 struct batadv_attribute batadv_attr_vlan_##_name = {    \
 121         .attr = {.name = __stringify(_name),            \
 122                  .mode = _mode },                       \
 123         .show   = _show,                                \
 124         .store  = _store,                               \
 125 }
 126 
 127 /* Use this, if you have customized show and store functions */
 128 #define BATADV_ATTR(_name, _mode, _show, _store)        \
 129 struct batadv_attribute batadv_attr_##_name = {         \
 130         .attr = {.name = __stringify(_name),            \
 131                  .mode = _mode },                       \
 132         .show   = _show,                                \
 133         .store  = _store,                               \
 134 }
 135 
 136 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
 137 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 138                              struct attribute *attr, char *buff,        \
 139                              size_t count)                              \
 140 {                                                                       \
 141         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 142         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 143         ssize_t length;                                                 \
 144                                                                         \
 145         batadv_sysfs_deprecated(attr);                                  \
 146         length = __batadv_store_bool_attr(buff, count, _post_func, attr,\
 147                                           &bat_priv->_name, net_dev);   \
 148                                                                         \
 149         batadv_netlink_notify_mesh(bat_priv);                           \
 150                                                                         \
 151         return length;                                                  \
 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         batadv_sysfs_deprecated(attr);                                  \
 161         return sprintf(buff, "%s\n",                                    \
 162                        atomic_read(&bat_priv->_name) == 0 ?             \
 163                        "disabled" : "enabled");                         \
 164 }                                                                       \
 165 
 166 /* Use this, if you are going to turn a [name] in the soft-interface
 167  * (bat_priv) on or off
 168  */
 169 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
 170         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
 171         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
 172         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 173                            batadv_store_##_name)
 174 
 175 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 176 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 177                              struct attribute *attr, char *buff,        \
 178                              size_t count)                              \
 179 {                                                                       \
 180         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 181         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
 182         ssize_t length;                                                 \
 183                                                                         \
 184         batadv_sysfs_deprecated(attr);                                  \
 185         length = __batadv_store_uint_attr(buff, count, _min, _max,      \
 186                                           _post_func, attr,             \
 187                                           &bat_priv->_var, net_dev,     \
 188                                           NULL);                        \
 189                                                                         \
 190         batadv_netlink_notify_mesh(bat_priv);                           \
 191                                                                         \
 192         return length;                                                  \
 193 }
 194 
 195 #define BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                          \
 196 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 197                             struct attribute *attr, char *buff)         \
 198 {                                                                       \
 199         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
 200                                                                         \
 201         batadv_sysfs_deprecated(attr);                                  \
 202         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var));     \
 203 }                                                                       \
 204 
 205 /* Use this, if you are going to set [name] in the soft-interface
 206  * (bat_priv) to an unsigned integer value
 207  */
 208 #define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 209         static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
 210         static BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                   \
 211         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 212                            batadv_store_##_name)
 213 
 214 #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)                  \
 215 ssize_t batadv_store_vlan_##_name(struct kobject *kobj,                 \
 216                                   struct attribute *attr, char *buff,   \
 217                                   size_t count)                         \
 218 {                                                                       \
 219         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 220         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 221                                                               kobj);    \
 222         size_t res = __batadv_store_bool_attr(buff, count, _post_func,  \
 223                                               attr, &vlan->_name,       \
 224                                               bat_priv->soft_iface);    \
 225                                                                         \
 226         batadv_sysfs_deprecated(attr);                                  \
 227         if (vlan->vid)                                                  \
 228                 batadv_netlink_notify_vlan(bat_priv, vlan);             \
 229         else                                                            \
 230                 batadv_netlink_notify_mesh(bat_priv);                   \
 231                                                                         \
 232         batadv_softif_vlan_put(vlan);                                   \
 233         return res;                                                     \
 234 }
 235 
 236 #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)                               \
 237 ssize_t batadv_show_vlan_##_name(struct kobject *kobj,                  \
 238                                  struct attribute *attr, char *buff)    \
 239 {                                                                       \
 240         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
 241         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
 242                                                               kobj);    \
 243         size_t res = sprintf(buff, "%s\n",                              \
 244                              atomic_read(&vlan->_name) == 0 ?           \
 245                              "disabled" : "enabled");                   \
 246                                                                         \
 247         batadv_sysfs_deprecated(attr);                                  \
 248         batadv_softif_vlan_put(vlan);                                   \
 249         return res;                                                     \
 250 }
 251 
 252 /* Use this, if you are going to turn a [name] in the vlan struct on or off */
 253 #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)                 \
 254         static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)           \
 255         static BATADV_ATTR_VLAN_SHOW_BOOL(_name)                        \
 256         static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
 257                                 batadv_store_vlan_##_name)
 258 
 259 #define BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
 260 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
 261                              struct attribute *attr, char *buff,        \
 262                              size_t count)                              \
 263 {                                                                       \
 264         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 265         struct batadv_hard_iface *hard_iface;                           \
 266         struct batadv_priv *bat_priv;                                   \
 267         ssize_t length;                                                 \
 268                                                                         \
 269         batadv_sysfs_deprecated(attr);                                  \
 270         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 271         if (!hard_iface)                                                \
 272                 return 0;                                               \
 273                                                                         \
 274         length = __batadv_store_uint_attr(buff, count, _min, _max,      \
 275                                           _post_func, attr,             \
 276                                           &hard_iface->_var,            \
 277                                           hard_iface->soft_iface,       \
 278                                           net_dev);                     \
 279                                                                         \
 280         if (hard_iface->soft_iface) {                                   \
 281                 bat_priv = netdev_priv(hard_iface->soft_iface);         \
 282                 batadv_netlink_notify_hardif(bat_priv, hard_iface);     \
 283         }                                                               \
 284                                                                         \
 285         batadv_hardif_put(hard_iface);                          \
 286         return length;                                                  \
 287 }
 288 
 289 #define BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                          \
 290 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
 291                             struct attribute *attr, char *buff)         \
 292 {                                                                       \
 293         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
 294         struct batadv_hard_iface *hard_iface;                           \
 295         ssize_t length;                                                 \
 296                                                                         \
 297         batadv_sysfs_deprecated(attr);                                  \
 298         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
 299         if (!hard_iface)                                                \
 300                 return 0;                                               \
 301                                                                         \
 302         length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \
 303                                                                         \
 304         batadv_hardif_put(hard_iface);                          \
 305         return length;                                                  \
 306 }
 307 
 308 /* Use this, if you are going to set [name] in hard_iface to an
 309  * unsigned integer value
 310  */
 311 #define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
 312         static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min,            \
 313                                           _max, _post_func)             \
 314         static BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                   \
 315         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
 316                            batadv_store_##_name)
 317 
 318 static int batadv_store_bool_attr(char *buff, size_t count,
 319                                   struct net_device *net_dev,
 320                                   const char *attr_name, atomic_t *attr,
 321                                   bool *changed)
 322 {
 323         int enabled = -1;
 324 
 325         *changed = false;
 326 
 327         if (buff[count - 1] == '\n')
 328                 buff[count - 1] = '\0';
 329 
 330         if ((strncmp(buff, "1", 2) == 0) ||
 331             (strncmp(buff, "enable", 7) == 0) ||
 332             (strncmp(buff, "enabled", 8) == 0))
 333                 enabled = 1;
 334 
 335         if ((strncmp(buff, "0", 2) == 0) ||
 336             (strncmp(buff, "disable", 8) == 0) ||
 337             (strncmp(buff, "disabled", 9) == 0))
 338                 enabled = 0;
 339 
 340         if (enabled < 0) {
 341                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 342                             attr_name, buff);
 343                 return -EINVAL;
 344         }
 345 
 346         if (atomic_read(attr) == enabled)
 347                 return count;
 348 
 349         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
 350                     atomic_read(attr) == 1 ? "enabled" : "disabled",
 351                     enabled == 1 ? "enabled" : "disabled");
 352 
 353         *changed = true;
 354 
 355         atomic_set(attr, (unsigned int)enabled);
 356         return count;
 357 }
 358 
 359 static inline ssize_t
 360 __batadv_store_bool_attr(char *buff, size_t count,
 361                          void (*post_func)(struct net_device *),
 362                          struct attribute *attr,
 363                          atomic_t *attr_store, struct net_device *net_dev)
 364 {
 365         bool changed;
 366         int ret;
 367 
 368         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
 369                                      attr_store, &changed);
 370         if (post_func && changed)
 371                 post_func(net_dev);
 372 
 373         return ret;
 374 }
 375 
 376 static int batadv_store_uint_attr(const char *buff, size_t count,
 377                                   struct net_device *net_dev,
 378                                   struct net_device *slave_dev,
 379                                   const char *attr_name,
 380                                   unsigned int min, unsigned int max,
 381                                   atomic_t *attr)
 382 {
 383         char ifname[IFNAMSIZ + 3] = "";
 384         unsigned long uint_val;
 385         int ret;
 386 
 387         ret = kstrtoul(buff, 10, &uint_val);
 388         if (ret) {
 389                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
 390                             attr_name, buff);
 391                 return -EINVAL;
 392         }
 393 
 394         if (uint_val < min) {
 395                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
 396                             attr_name, uint_val, min);
 397                 return -EINVAL;
 398         }
 399 
 400         if (uint_val > max) {
 401                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
 402                             attr_name, uint_val, max);
 403                 return -EINVAL;
 404         }
 405 
 406         if (atomic_read(attr) == uint_val)
 407                 return count;
 408 
 409         if (slave_dev)
 410                 snprintf(ifname, sizeof(ifname), "%s: ", slave_dev->name);
 411 
 412         batadv_info(net_dev, "%s: %sChanging from: %i to: %lu\n",
 413                     attr_name, ifname, atomic_read(attr), uint_val);
 414 
 415         atomic_set(attr, uint_val);
 416         return count;
 417 }
 418 
 419 static ssize_t __batadv_store_uint_attr(const char *buff, size_t count,
 420                                         int min, int max,
 421                                         void (*post_func)(struct net_device *),
 422                                         const struct attribute *attr,
 423                                         atomic_t *attr_store,
 424                                         struct net_device *net_dev,
 425                                         struct net_device *slave_dev)
 426 {
 427         int ret;
 428 
 429         ret = batadv_store_uint_attr(buff, count, net_dev, slave_dev,
 430                                      attr->name, min, max, attr_store);
 431         if (post_func && ret)
 432                 post_func(net_dev);
 433 
 434         return ret;
 435 }
 436 
 437 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 438                                     struct attribute *attr, char *buff)
 439 {
 440         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 441 
 442         batadv_sysfs_deprecated(attr);
 443         return sprintf(buff, "%s\n", bat_priv->algo_ops->name);
 444 }
 445 
 446 static void batadv_post_gw_reselect(struct net_device *net_dev)
 447 {
 448         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 449 
 450         batadv_gw_reselect(bat_priv);
 451 }
 452 
 453 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
 454                                    char *buff)
 455 {
 456         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 457         int bytes_written;
 458 
 459         batadv_sysfs_deprecated(attr);
 460 
 461         /* GW mode is not available if the routing algorithm in use does not
 462          * implement the GW API
 463          */
 464         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 465             !bat_priv->algo_ops->gw.is_eligible)
 466                 return -ENOENT;
 467 
 468         switch (atomic_read(&bat_priv->gw.mode)) {
 469         case BATADV_GW_MODE_CLIENT:
 470                 bytes_written = sprintf(buff, "%s\n",
 471                                         BATADV_GW_MODE_CLIENT_NAME);
 472                 break;
 473         case BATADV_GW_MODE_SERVER:
 474                 bytes_written = sprintf(buff, "%s\n",
 475                                         BATADV_GW_MODE_SERVER_NAME);
 476                 break;
 477         default:
 478                 bytes_written = sprintf(buff, "%s\n",
 479                                         BATADV_GW_MODE_OFF_NAME);
 480                 break;
 481         }
 482 
 483         return bytes_written;
 484 }
 485 
 486 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
 487                                     struct attribute *attr, char *buff,
 488                                     size_t count)
 489 {
 490         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 491         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 492         char *curr_gw_mode_str;
 493         int gw_mode_tmp = -1;
 494 
 495         batadv_sysfs_deprecated(attr);
 496 
 497         /* toggling GW mode is allowed only if the routing algorithm in use
 498          * provides the GW API
 499          */
 500         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 501             !bat_priv->algo_ops->gw.is_eligible)
 502                 return -EINVAL;
 503 
 504         if (buff[count - 1] == '\n')
 505                 buff[count - 1] = '\0';
 506 
 507         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
 508                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
 509                 gw_mode_tmp = BATADV_GW_MODE_OFF;
 510 
 511         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
 512                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
 513                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
 514 
 515         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
 516                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
 517                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
 518 
 519         if (gw_mode_tmp < 0) {
 520                 batadv_info(net_dev,
 521                             "Invalid parameter for 'gw mode' setting received: %s\n",
 522                             buff);
 523                 return -EINVAL;
 524         }
 525 
 526         if (atomic_read(&bat_priv->gw.mode) == gw_mode_tmp)
 527                 return count;
 528 
 529         switch (atomic_read(&bat_priv->gw.mode)) {
 530         case BATADV_GW_MODE_CLIENT:
 531                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
 532                 break;
 533         case BATADV_GW_MODE_SERVER:
 534                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
 535                 break;
 536         default:
 537                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
 538                 break;
 539         }
 540 
 541         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
 542                     curr_gw_mode_str, buff);
 543 
 544         /* Invoking batadv_gw_reselect() is not enough to really de-select the
 545          * current GW. It will only instruct the gateway client code to perform
 546          * a re-election the next time that this is needed.
 547          *
 548          * When gw client mode is being switched off the current GW must be
 549          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
 550          * client mode re-activation. This is operation is performed in
 551          * batadv_gw_check_client_stop().
 552          */
 553         batadv_gw_reselect(bat_priv);
 554         /* always call batadv_gw_check_client_stop() before changing the gateway
 555          * state
 556          */
 557         batadv_gw_check_client_stop(bat_priv);
 558         atomic_set(&bat_priv->gw.mode, (unsigned int)gw_mode_tmp);
 559         batadv_gw_tvlv_container_update(bat_priv);
 560 
 561         batadv_netlink_notify_mesh(bat_priv);
 562 
 563         return count;
 564 }
 565 
 566 static ssize_t batadv_show_gw_sel_class(struct kobject *kobj,
 567                                         struct attribute *attr, char *buff)
 568 {
 569         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 570 
 571         batadv_sysfs_deprecated(attr);
 572 
 573         /* GW selection class is not available if the routing algorithm in use
 574          * does not implement the GW API
 575          */
 576         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 577             !bat_priv->algo_ops->gw.is_eligible)
 578                 return -ENOENT;
 579 
 580         if (bat_priv->algo_ops->gw.show_sel_class)
 581                 return bat_priv->algo_ops->gw.show_sel_class(bat_priv, buff);
 582 
 583         return sprintf(buff, "%i\n", atomic_read(&bat_priv->gw.sel_class));
 584 }
 585 
 586 static ssize_t batadv_store_gw_sel_class(struct kobject *kobj,
 587                                          struct attribute *attr, char *buff,
 588                                          size_t count)
 589 {
 590         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 591         ssize_t length;
 592 
 593         batadv_sysfs_deprecated(attr);
 594 
 595         /* setting the GW selection class is allowed only if the routing
 596          * algorithm in use implements the GW API
 597          */
 598         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
 599             !bat_priv->algo_ops->gw.is_eligible)
 600                 return -EINVAL;
 601 
 602         if (buff[count - 1] == '\n')
 603                 buff[count - 1] = '\0';
 604 
 605         if (bat_priv->algo_ops->gw.store_sel_class)
 606                 return bat_priv->algo_ops->gw.store_sel_class(bat_priv, buff,
 607                                                               count);
 608 
 609         length = __batadv_store_uint_attr(buff, count, 1, BATADV_TQ_MAX_VALUE,
 610                                           batadv_post_gw_reselect, attr,
 611                                           &bat_priv->gw.sel_class,
 612                                           bat_priv->soft_iface, NULL);
 613 
 614         batadv_netlink_notify_mesh(bat_priv);
 615 
 616         return length;
 617 }
 618 
 619 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
 620                                      struct attribute *attr, char *buff)
 621 {
 622         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 623         u32 down, up;
 624 
 625         batadv_sysfs_deprecated(attr);
 626 
 627         down = atomic_read(&bat_priv->gw.bandwidth_down);
 628         up = atomic_read(&bat_priv->gw.bandwidth_up);
 629 
 630         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
 631                        down % 10, up / 10, up % 10);
 632 }
 633 
 634 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
 635                                       struct attribute *attr, char *buff,
 636                                       size_t count)
 637 {
 638         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 639         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 640         ssize_t length;
 641 
 642         batadv_sysfs_deprecated(attr);
 643 
 644         if (buff[count - 1] == '\n')
 645                 buff[count - 1] = '\0';
 646 
 647         length = batadv_gw_bandwidth_set(net_dev, buff, count);
 648 
 649         batadv_netlink_notify_mesh(bat_priv);
 650 
 651         return length;
 652 }
 653 
 654 /**
 655  * batadv_show_isolation_mark() - print the current isolation mark/mask
 656  * @kobj: kobject representing the private mesh sysfs directory
 657  * @attr: the batman-adv attribute the user is interacting with
 658  * @buff: the buffer that will contain the data to send back to the user
 659  *
 660  * Return: the number of bytes written into 'buff' on success or a negative
 661  * error code in case of failure
 662  */
 663 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
 664                                           struct attribute *attr, char *buff)
 665 {
 666         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 667 
 668         batadv_sysfs_deprecated(attr);
 669         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
 670                        bat_priv->isolation_mark_mask);
 671 }
 672 
 673 /**
 674  * batadv_store_isolation_mark() - parse and store the isolation mark/mask
 675  *  entered by the user
 676  * @kobj: kobject representing the private mesh sysfs directory
 677  * @attr: the batman-adv attribute the user is interacting with
 678  * @buff: the buffer containing the user data
 679  * @count: number of bytes in the buffer
 680  *
 681  * Return: 'count' on success or a negative error code in case of failure
 682  */
 683 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
 684                                            struct attribute *attr, char *buff,
 685                                            size_t count)
 686 {
 687         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 688         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 689         u32 mark, mask;
 690         char *mask_ptr;
 691 
 692         batadv_sysfs_deprecated(attr);
 693 
 694         /* parse the mask if it has been specified, otherwise assume the mask is
 695          * the biggest possible
 696          */
 697         mask = 0xFFFFFFFF;
 698         mask_ptr = strchr(buff, '/');
 699         if (mask_ptr) {
 700                 *mask_ptr = '\0';
 701                 mask_ptr++;
 702 
 703                 /* the mask must be entered in hex base as it is going to be a
 704                  * bitmask and not a prefix length
 705                  */
 706                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
 707                         return -EINVAL;
 708         }
 709 
 710         /* the mark can be entered in any base */
 711         if (kstrtou32(buff, 0, &mark) < 0)
 712                 return -EINVAL;
 713 
 714         bat_priv->isolation_mark_mask = mask;
 715         /* erase bits not covered by the mask */
 716         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
 717 
 718         batadv_info(net_dev,
 719                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
 720                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
 721 
 722         batadv_netlink_notify_mesh(bat_priv);
 723 
 724         return count;
 725 }
 726 
 727 BATADV_ATTR_SIF_BOOL(aggregated_ogms, 0644, NULL);
 728 BATADV_ATTR_SIF_BOOL(bonding, 0644, NULL);
 729 #ifdef CONFIG_BATMAN_ADV_BLA
 730 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, 0644, batadv_bla_status_update);
 731 #endif
 732 #ifdef CONFIG_BATMAN_ADV_DAT
 733 BATADV_ATTR_SIF_BOOL(distributed_arp_table, 0644, batadv_dat_status_update);
 734 #endif
 735 BATADV_ATTR_SIF_BOOL(fragmentation, 0644, batadv_update_min_mtu);
 736 static BATADV_ATTR(routing_algo, 0444, batadv_show_bat_algo, NULL);
 737 static BATADV_ATTR(gw_mode, 0644, batadv_show_gw_mode, batadv_store_gw_mode);
 738 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, 0644, 2 * BATADV_JITTER,
 739                      INT_MAX, NULL);
 740 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, 0644, 0, BATADV_TQ_MAX_VALUE,
 741                      NULL);
 742 static BATADV_ATTR(gw_sel_class, 0644, batadv_show_gw_sel_class,
 743                    batadv_store_gw_sel_class);
 744 static BATADV_ATTR(gw_bandwidth, 0644, batadv_show_gw_bwidth,
 745                    batadv_store_gw_bwidth);
 746 #ifdef CONFIG_BATMAN_ADV_MCAST
 747 BATADV_ATTR_SIF_BOOL(multicast_mode, 0644, NULL);
 748 #endif
 749 #ifdef CONFIG_BATMAN_ADV_DEBUG
 750 BATADV_ATTR_SIF_UINT(log_level, log_level, 0644, 0, BATADV_DBG_ALL, NULL);
 751 #endif
 752 #ifdef CONFIG_BATMAN_ADV_NC
 753 BATADV_ATTR_SIF_BOOL(network_coding, 0644, batadv_nc_status_update);
 754 #endif
 755 static BATADV_ATTR(isolation_mark, 0644, batadv_show_isolation_mark,
 756                    batadv_store_isolation_mark);
 757 
 758 static struct batadv_attribute *batadv_mesh_attrs[] = {
 759         &batadv_attr_aggregated_ogms,
 760         &batadv_attr_bonding,
 761 #ifdef CONFIG_BATMAN_ADV_BLA
 762         &batadv_attr_bridge_loop_avoidance,
 763 #endif
 764 #ifdef CONFIG_BATMAN_ADV_DAT
 765         &batadv_attr_distributed_arp_table,
 766 #endif
 767 #ifdef CONFIG_BATMAN_ADV_MCAST
 768         &batadv_attr_multicast_mode,
 769 #endif
 770         &batadv_attr_fragmentation,
 771         &batadv_attr_routing_algo,
 772         &batadv_attr_gw_mode,
 773         &batadv_attr_orig_interval,
 774         &batadv_attr_hop_penalty,
 775         &batadv_attr_gw_sel_class,
 776         &batadv_attr_gw_bandwidth,
 777 #ifdef CONFIG_BATMAN_ADV_DEBUG
 778         &batadv_attr_log_level,
 779 #endif
 780 #ifdef CONFIG_BATMAN_ADV_NC
 781         &batadv_attr_network_coding,
 782 #endif
 783         &batadv_attr_isolation_mark,
 784         NULL,
 785 };
 786 
 787 BATADV_ATTR_VLAN_BOOL(ap_isolation, 0644, NULL);
 788 
 789 /* array of vlan specific sysfs attributes */
 790 static struct batadv_attribute *batadv_vlan_attrs[] = {
 791         &batadv_attr_vlan_ap_isolation,
 792         NULL,
 793 };
 794 
 795 /**
 796  * batadv_sysfs_add_meshif() - Add soft interface specific sysfs entries
 797  * @dev: netdev struct of the soft interface
 798  *
 799  * Return: 0 on success or negative error number in case of failure
 800  */
 801 int batadv_sysfs_add_meshif(struct net_device *dev)
 802 {
 803         struct kobject *batif_kobject = &dev->dev.kobj;
 804         struct batadv_priv *bat_priv = netdev_priv(dev);
 805         struct batadv_attribute **bat_attr;
 806         int err;
 807 
 808         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
 809                                                     batif_kobject);
 810         if (!bat_priv->mesh_obj) {
 811                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
 812                            BATADV_SYSFS_IF_MESH_SUBDIR);
 813                 goto out;
 814         }
 815 
 816         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
 817                 err = sysfs_create_file(bat_priv->mesh_obj,
 818                                         &((*bat_attr)->attr));
 819                 if (err) {
 820                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 821                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
 822                                    ((*bat_attr)->attr).name);
 823                         goto rem_attr;
 824                 }
 825         }
 826 
 827         return 0;
 828 
 829 rem_attr:
 830         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 831                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 832 
 833         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 834         kobject_del(bat_priv->mesh_obj);
 835         kobject_put(bat_priv->mesh_obj);
 836         bat_priv->mesh_obj = NULL;
 837 out:
 838         return -ENOMEM;
 839 }
 840 
 841 /**
 842  * batadv_sysfs_del_meshif() - Remove soft interface specific sysfs entries
 843  * @dev: netdev struct of the soft interface
 844  */
 845 void batadv_sysfs_del_meshif(struct net_device *dev)
 846 {
 847         struct batadv_priv *bat_priv = netdev_priv(dev);
 848         struct batadv_attribute **bat_attr;
 849 
 850         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
 851                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
 852 
 853         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
 854         kobject_del(bat_priv->mesh_obj);
 855         kobject_put(bat_priv->mesh_obj);
 856         bat_priv->mesh_obj = NULL;
 857 }
 858 
 859 /**
 860  * batadv_sysfs_add_vlan() - add all the needed sysfs objects for the new vlan
 861  * @dev: netdev of the mesh interface
 862  * @vlan: private data of the newly added VLAN interface
 863  *
 864  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
 865  */
 866 int batadv_sysfs_add_vlan(struct net_device *dev,
 867                           struct batadv_softif_vlan *vlan)
 868 {
 869         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
 870         struct batadv_priv *bat_priv = netdev_priv(dev);
 871         struct batadv_attribute **bat_attr;
 872         int err;
 873 
 874         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
 875                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
 876                         vlan->vid & VLAN_VID_MASK);
 877 
 878                 vlan->kobj = kobject_create_and_add(vlan_subdir,
 879                                                     bat_priv->mesh_obj);
 880                 if (!vlan->kobj) {
 881                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
 882                                    dev->name, vlan_subdir);
 883                         goto out;
 884                 }
 885         } else {
 886                 /* the untagged LAN uses the root folder to store its "VLAN
 887                  * specific attributes"
 888                  */
 889                 vlan->kobj = bat_priv->mesh_obj;
 890                 kobject_get(bat_priv->mesh_obj);
 891         }
 892 
 893         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
 894                 err = sysfs_create_file(vlan->kobj,
 895                                         &((*bat_attr)->attr));
 896                 if (err) {
 897                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
 898                                    dev->name, vlan_subdir,
 899                                    ((*bat_attr)->attr).name);
 900                         goto rem_attr;
 901                 }
 902         }
 903 
 904         return 0;
 905 
 906 rem_attr:
 907         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 908                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 909 
 910         if (vlan->kobj != bat_priv->mesh_obj) {
 911                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 912                 kobject_del(vlan->kobj);
 913         }
 914         kobject_put(vlan->kobj);
 915         vlan->kobj = NULL;
 916 out:
 917         return -ENOMEM;
 918 }
 919 
 920 /**
 921  * batadv_sysfs_del_vlan() - remove all the sysfs objects for a given VLAN
 922  * @bat_priv: the bat priv with all the soft interface information
 923  * @vlan: the private data of the VLAN to destroy
 924  */
 925 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
 926                            struct batadv_softif_vlan *vlan)
 927 {
 928         struct batadv_attribute **bat_attr;
 929 
 930         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
 931                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
 932 
 933         if (vlan->kobj != bat_priv->mesh_obj) {
 934                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
 935                 kobject_del(vlan->kobj);
 936         }
 937         kobject_put(vlan->kobj);
 938         vlan->kobj = NULL;
 939 }
 940 
 941 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
 942                                       struct attribute *attr, char *buff)
 943 {
 944         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
 945         struct batadv_hard_iface *hard_iface;
 946         ssize_t length;
 947         const char *ifname;
 948 
 949         batadv_sysfs_deprecated(attr);
 950 
 951         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 952         if (!hard_iface)
 953                 return 0;
 954 
 955         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
 956                 ifname =  "none";
 957         else
 958                 ifname = hard_iface->soft_iface->name;
 959 
 960         length = sprintf(buff, "%s\n", ifname);
 961 
 962         batadv_hardif_put(hard_iface);
 963 
 964         return length;
 965 }
 966 
 967 /**
 968  * batadv_store_mesh_iface_finish() - store new hardif mesh_iface state
 969  * @net_dev: netdevice to add/remove to/from batman-adv soft-interface
 970  * @ifname: name of soft-interface to modify
 971  *
 972  * Changes the parts of the hard+soft interface which can not be modified under
 973  * sysfs lock (to prevent deadlock situations).
 974  *
 975  * Return: 0 on success, 0 < on failure
 976  */
 977 static int batadv_store_mesh_iface_finish(struct net_device *net_dev,
 978                                           char ifname[IFNAMSIZ])
 979 {
 980         struct net *net = dev_net(net_dev);
 981         struct batadv_hard_iface *hard_iface;
 982         int status_tmp;
 983         int ret = 0;
 984 
 985         ASSERT_RTNL();
 986 
 987         hard_iface = batadv_hardif_get_by_netdev(net_dev);
 988         if (!hard_iface)
 989                 return 0;
 990 
 991         if (strncmp(ifname, "none", 4) == 0)
 992                 status_tmp = BATADV_IF_NOT_IN_USE;
 993         else
 994                 status_tmp = BATADV_IF_I_WANT_YOU;
 995 
 996         if (hard_iface->if_status == status_tmp)
 997                 goto out;
 998 
 999         if (hard_iface->soft_iface &&
1000             strncmp(hard_iface->soft_iface->name, ifname, IFNAMSIZ) == 0)
1001                 goto out;
1002 
1003         if (status_tmp == BATADV_IF_NOT_IN_USE) {
1004                 batadv_hardif_disable_interface(hard_iface,
1005                                                 BATADV_IF_CLEANUP_AUTO);
1006                 goto out;
1007         }
1008 
1009         /* if the interface already is in use */
1010         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
1011                 batadv_hardif_disable_interface(hard_iface,
1012                                                 BATADV_IF_CLEANUP_AUTO);
1013 
1014         ret = batadv_hardif_enable_interface(hard_iface, net, ifname);
1015 out:
1016         batadv_hardif_put(hard_iface);
1017         return ret;
1018 }
1019 
1020 /**
1021  * batadv_store_mesh_iface_work() - store new hardif mesh_iface state
1022  * @work: work queue item
1023  *
1024  * Changes the parts of the hard+soft interface which can not be modified under
1025  * sysfs lock (to prevent deadlock situations).
1026  */
1027 static void batadv_store_mesh_iface_work(struct work_struct *work)
1028 {
1029         struct batadv_store_mesh_work *store_work;
1030         int ret;
1031 
1032         store_work = container_of(work, struct batadv_store_mesh_work, work);
1033 
1034         rtnl_lock();
1035         ret = batadv_store_mesh_iface_finish(store_work->net_dev,
1036                                              store_work->soft_iface_name);
1037         rtnl_unlock();
1038 
1039         if (ret < 0)
1040                 pr_err("Failed to store new mesh_iface state %s for %s: %d\n",
1041                        store_work->soft_iface_name, store_work->net_dev->name,
1042                        ret);
1043 
1044         dev_put(store_work->net_dev);
1045         kfree(store_work);
1046 }
1047 
1048 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
1049                                        struct attribute *attr, char *buff,
1050                                        size_t count)
1051 {
1052         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1053         struct batadv_store_mesh_work *store_work;
1054 
1055         batadv_sysfs_deprecated(attr);
1056 
1057         if (buff[count - 1] == '\n')
1058                 buff[count - 1] = '\0';
1059 
1060         if (strlen(buff) >= IFNAMSIZ) {
1061                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
1062                        buff);
1063                 return -EINVAL;
1064         }
1065 
1066         store_work = kmalloc(sizeof(*store_work), GFP_KERNEL);
1067         if (!store_work)
1068                 return -ENOMEM;
1069 
1070         dev_hold(net_dev);
1071         INIT_WORK(&store_work->work, batadv_store_mesh_iface_work);
1072         store_work->net_dev = net_dev;
1073         strscpy(store_work->soft_iface_name, buff,
1074                 sizeof(store_work->soft_iface_name));
1075 
1076         queue_work(batadv_event_workqueue, &store_work->work);
1077 
1078         return count;
1079 }
1080 
1081 static ssize_t batadv_show_iface_status(struct kobject *kobj,
1082                                         struct attribute *attr, char *buff)
1083 {
1084         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1085         struct batadv_hard_iface *hard_iface;
1086         ssize_t length;
1087 
1088         batadv_sysfs_deprecated(attr);
1089 
1090         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1091         if (!hard_iface)
1092                 return 0;
1093 
1094         switch (hard_iface->if_status) {
1095         case BATADV_IF_TO_BE_REMOVED:
1096                 length = sprintf(buff, "disabling\n");
1097                 break;
1098         case BATADV_IF_INACTIVE:
1099                 length = sprintf(buff, "inactive\n");
1100                 break;
1101         case BATADV_IF_ACTIVE:
1102                 length = sprintf(buff, "active\n");
1103                 break;
1104         case BATADV_IF_TO_BE_ACTIVATED:
1105                 length = sprintf(buff, "enabling\n");
1106                 break;
1107         case BATADV_IF_NOT_IN_USE:
1108         default:
1109                 length = sprintf(buff, "not in use\n");
1110                 break;
1111         }
1112 
1113         batadv_hardif_put(hard_iface);
1114 
1115         return length;
1116 }
1117 
1118 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1119 
1120 /**
1121  * batadv_store_throughput_override() - parse and store throughput override
1122  *  entered by the user
1123  * @kobj: kobject representing the private mesh sysfs directory
1124  * @attr: the batman-adv attribute the user is interacting with
1125  * @buff: the buffer containing the user data
1126  * @count: number of bytes in the buffer
1127  *
1128  * Return: 'count' on success or a negative error code in case of failure
1129  */
1130 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
1131                                                 struct attribute *attr,
1132                                                 char *buff, size_t count)
1133 {
1134         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1135         struct batadv_hard_iface *hard_iface;
1136         struct batadv_priv *bat_priv;
1137         u32 tp_override;
1138         u32 old_tp_override;
1139         bool ret;
1140 
1141         batadv_sysfs_deprecated(attr);
1142 
1143         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1144         if (!hard_iface)
1145                 return -EINVAL;
1146 
1147         if (buff[count - 1] == '\n')
1148                 buff[count - 1] = '\0';
1149 
1150         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
1151                                       &tp_override);
1152         if (!ret)
1153                 goto out;
1154 
1155         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1156         if (old_tp_override == tp_override)
1157                 goto out;
1158 
1159         batadv_info(hard_iface->soft_iface,
1160                     "%s: %s: Changing from: %u.%u MBit to: %u.%u MBit\n",
1161                     "throughput_override", net_dev->name,
1162                     old_tp_override / 10, old_tp_override % 10,
1163                     tp_override / 10, tp_override % 10);
1164 
1165         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
1166 
1167         if (hard_iface->soft_iface) {
1168                 bat_priv = netdev_priv(hard_iface->soft_iface);
1169                 batadv_netlink_notify_hardif(bat_priv, hard_iface);
1170         }
1171 
1172 out:
1173         batadv_hardif_put(hard_iface);
1174         return count;
1175 }
1176 
1177 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
1178                                                struct attribute *attr,
1179                                                char *buff)
1180 {
1181         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1182         struct batadv_hard_iface *hard_iface;
1183         u32 tp_override;
1184 
1185         batadv_sysfs_deprecated(attr);
1186 
1187         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1188         if (!hard_iface)
1189                 return -EINVAL;
1190 
1191         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1192 
1193         batadv_hardif_put(hard_iface);
1194         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
1195                        tp_override % 10);
1196 }
1197 
1198 #endif
1199 
1200 static BATADV_ATTR(mesh_iface, 0644, batadv_show_mesh_iface,
1201                    batadv_store_mesh_iface);
1202 static BATADV_ATTR(iface_status, 0444, batadv_show_iface_status, NULL);
1203 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1204 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, 0644,
1205                      2 * BATADV_JITTER, INT_MAX, NULL);
1206 static BATADV_ATTR(throughput_override, 0644, batadv_show_throughput_override,
1207                    batadv_store_throughput_override);
1208 #endif
1209 
1210 static struct batadv_attribute *batadv_batman_attrs[] = {
1211         &batadv_attr_mesh_iface,
1212         &batadv_attr_iface_status,
1213 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1214         &batadv_attr_elp_interval,
1215         &batadv_attr_throughput_override,
1216 #endif
1217         NULL,
1218 };
1219 
1220 /**
1221  * batadv_sysfs_add_hardif() - Add hard interface specific sysfs entries
1222  * @hardif_obj: address where to store the pointer to new sysfs folder
1223  * @dev: netdev struct of the hard interface
1224  *
1225  * Return: 0 on success or negative error number in case of failure
1226  */
1227 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1228 {
1229         struct kobject *hardif_kobject = &dev->dev.kobj;
1230         struct batadv_attribute **bat_attr;
1231         int err;
1232 
1233         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1234                                              hardif_kobject);
1235 
1236         if (!*hardif_obj) {
1237                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1238                            BATADV_SYSFS_IF_BAT_SUBDIR);
1239                 goto out;
1240         }
1241 
1242         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1243                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1244                 if (err) {
1245                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1246                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1247                                    ((*bat_attr)->attr).name);
1248                         goto rem_attr;
1249                 }
1250         }
1251 
1252         return 0;
1253 
1254 rem_attr:
1255         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1256                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1257 out:
1258         return -ENOMEM;
1259 }
1260 
1261 /**
1262  * batadv_sysfs_del_hardif() - Remove hard interface specific sysfs entries
1263  * @hardif_obj: address to the pointer to which stores batman-adv sysfs folder
1264  *  of the hard interface
1265  */
1266 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1267 {
1268         kobject_uevent(*hardif_obj, KOBJ_REMOVE);
1269         kobject_del(*hardif_obj);
1270         kobject_put(*hardif_obj);
1271         *hardif_obj = NULL;
1272 }
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root/net/batman-adv/sysfs.c

DEFINITIONS
