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TOMOYO Linux Cross Reference
Linux/net/batman-adv/sysfs.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /* Copyright (C) 2010-2018  B.A.T.M.A.N. contributors:
  3  *
  4  * Marek Lindner
  5  *
  6  * This program is free software; you can redistribute it and/or
  7  * modify it under the terms of version 2 of the GNU General Public
  8  * License as published by the Free Software Foundation.
  9  *
 10  * This program is distributed in the hope that it will be useful, but
 11  * WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 13  * General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
 17  */
 18 
 19 #include "sysfs.h"
 20 #include "main.h"
 21 
 22 #include <linux/atomic.h>
 23 #include <linux/compiler.h>
 24 #include <linux/device.h>
 25 #include <linux/errno.h>
 26 #include <linux/gfp.h>
 27 #include <linux/if.h>
 28 #include <linux/if_vlan.h>
 29 #include <linux/kernel.h>
 30 #include <linux/kobject.h>
 31 #include <linux/kref.h>
 32 #include <linux/netdevice.h>
 33 #include <linux/printk.h>
 34 #include <linux/rculist.h>
 35 #include <linux/rcupdate.h>
 36 #include <linux/rtnetlink.h>
 37 #include <linux/slab.h>
 38 #include <linux/stddef.h>
 39 #include <linux/string.h>
 40 #include <linux/stringify.h>
 41 #include <linux/workqueue.h>
 42 #include <uapi/linux/batadv_packet.h>
 43 
 44 #include "bridge_loop_avoidance.h"
 45 #include "distributed-arp-table.h"
 46 #include "gateway_client.h"
 47 #include "gateway_common.h"
 48 #include "hard-interface.h"
 49 #include "log.h"
 50 #include "network-coding.h"
 51 #include "soft-interface.h"
 52 
 53 static struct net_device *batadv_kobj_to_netdev(struct kobject *obj)
 54 {
 55         struct device *dev = container_of(obj->parent, struct device, kobj);
 56 
 57         return to_net_dev(dev);
 58 }
 59 
 60 static struct batadv_priv *batadv_kobj_to_batpriv(struct kobject *obj)
 61 {
 62         struct net_device *net_dev = batadv_kobj_to_netdev(obj);
 63 
 64         return netdev_priv(net_dev);
 65 }
 66 
 67 /**
 68  * batadv_vlan_kobj_to_batpriv() - convert a vlan kobj in the associated batpriv
 69  * @obj: kobject to covert
 70  *
 71  * Return: the associated batadv_priv struct.
 72  */
 73 static struct batadv_priv *batadv_vlan_kobj_to_batpriv(struct kobject *obj)
 74 {
 75         /* VLAN specific attributes are located in the root sysfs folder if they
 76          * refer to the untagged VLAN..
 77          */
 78         if (!strcmp(BATADV_SYSFS_IF_MESH_SUBDIR, obj->name))
 79                 return batadv_kobj_to_batpriv(obj);
 80 
 81         /* ..while the attributes for the tagged vlans are located in
 82          * the in the corresponding "vlan%VID" subfolder
 83          */
 84         return batadv_kobj_to_batpriv(obj->parent);
 85 }
 86 
 87 /**
 88  * batadv_kobj_to_vlan() - convert a kobj in the associated softif_vlan struct
 89  * @bat_priv: the bat priv with all the soft interface information
 90  * @obj: kobject to covert
 91  *
 92  * Return: the associated softif_vlan struct if found, NULL otherwise.
 93  */
 94 static struct batadv_softif_vlan *
 95 batadv_kobj_to_vlan(struct batadv_priv *bat_priv, struct kobject *obj)
 96 {
 97         struct batadv_softif_vlan *vlan_tmp, *vlan = NULL;
 98 
 99         rcu_read_lock();
100         hlist_for_each_entry_rcu(vlan_tmp, &bat_priv->softif_vlan_list, list) {
101                 if (vlan_tmp->kobj != obj)
102                         continue;
103 
104                 if (!kref_get_unless_zero(&vlan_tmp->refcount))
105                         continue;
106 
107                 vlan = vlan_tmp;
108                 break;
109         }
110         rcu_read_unlock();
111 
112         return vlan;
113 }
114 
115 #define BATADV_UEV_TYPE_VAR     "BATTYPE="
116 #define BATADV_UEV_ACTION_VAR   "BATACTION="
117 #define BATADV_UEV_DATA_VAR     "BATDATA="
118 
119 static char *batadv_uev_action_str[] = {
120         "add",
121         "del",
122         "change",
123         "loopdetect",
124 };
125 
126 static char *batadv_uev_type_str[] = {
127         "gw",
128         "bla",
129 };
130 
131 /* Use this, if you have customized show and store functions for vlan attrs */
132 #define BATADV_ATTR_VLAN(_name, _mode, _show, _store)   \
133 struct batadv_attribute batadv_attr_vlan_##_name = {    \
134         .attr = {.name = __stringify(_name),            \
135                  .mode = _mode },                       \
136         .show   = _show,                                \
137         .store  = _store,                               \
138 }
139 
140 /* Use this, if you have customized show and store functions */
141 #define BATADV_ATTR(_name, _mode, _show, _store)        \
142 struct batadv_attribute batadv_attr_##_name = {         \
143         .attr = {.name = __stringify(_name),            \
144                  .mode = _mode },                       \
145         .show   = _show,                                \
146         .store  = _store,                               \
147 }
148 
149 #define BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)                   \
150 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
151                              struct attribute *attr, char *buff,        \
152                              size_t count)                              \
153 {                                                                       \
154         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
155         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
156                                                                         \
157         return __batadv_store_bool_attr(buff, count, _post_func, attr,  \
158                                         &bat_priv->_name, net_dev);     \
159 }
160 
161 #define BATADV_ATTR_SIF_SHOW_BOOL(_name)                                \
162 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
163                             struct attribute *attr, char *buff)         \
164 {                                                                       \
165         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
166                                                                         \
167         return sprintf(buff, "%s\n",                                    \
168                        atomic_read(&bat_priv->_name) == 0 ?             \
169                        "disabled" : "enabled");                         \
170 }                                                                       \
171 
172 /* Use this, if you are going to turn a [name] in the soft-interface
173  * (bat_priv) on or off
174  */
175 #define BATADV_ATTR_SIF_BOOL(_name, _mode, _post_func)                  \
176         static BATADV_ATTR_SIF_STORE_BOOL(_name, _post_func)            \
177         static BATADV_ATTR_SIF_SHOW_BOOL(_name)                         \
178         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
179                            batadv_store_##_name)
180 
181 #define BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
182 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
183                              struct attribute *attr, char *buff,        \
184                              size_t count)                              \
185 {                                                                       \
186         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
187         struct batadv_priv *bat_priv = netdev_priv(net_dev);            \
188                                                                         \
189         return __batadv_store_uint_attr(buff, count, _min, _max,        \
190                                         _post_func, attr,               \
191                                         &bat_priv->_var, net_dev);      \
192 }
193 
194 #define BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                          \
195 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
196                             struct attribute *attr, char *buff)         \
197 {                                                                       \
198         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);    \
199                                                                         \
200         return sprintf(buff, "%i\n", atomic_read(&bat_priv->_var));     \
201 }                                                                       \
202 
203 /* Use this, if you are going to set [name] in the soft-interface
204  * (bat_priv) to an unsigned integer value
205  */
206 #define BATADV_ATTR_SIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
207         static BATADV_ATTR_SIF_STORE_UINT(_name, _var, _min, _max, _post_func)\
208         static BATADV_ATTR_SIF_SHOW_UINT(_name, _var)                   \
209         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
210                            batadv_store_##_name)
211 
212 #define BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)                  \
213 ssize_t batadv_store_vlan_##_name(struct kobject *kobj,                 \
214                                   struct attribute *attr, char *buff,   \
215                                   size_t count)                         \
216 {                                                                       \
217         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
218         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
219                                                               kobj);    \
220         size_t res = __batadv_store_bool_attr(buff, count, _post_func,  \
221                                               attr, &vlan->_name,       \
222                                               bat_priv->soft_iface);    \
223                                                                         \
224         batadv_softif_vlan_put(vlan);                                   \
225         return res;                                                     \
226 }
227 
228 #define BATADV_ATTR_VLAN_SHOW_BOOL(_name)                               \
229 ssize_t batadv_show_vlan_##_name(struct kobject *kobj,                  \
230                                  struct attribute *attr, char *buff)    \
231 {                                                                       \
232         struct batadv_priv *bat_priv = batadv_vlan_kobj_to_batpriv(kobj);\
233         struct batadv_softif_vlan *vlan = batadv_kobj_to_vlan(bat_priv, \
234                                                               kobj);    \
235         size_t res = sprintf(buff, "%s\n",                              \
236                              atomic_read(&vlan->_name) == 0 ?           \
237                              "disabled" : "enabled");                   \
238                                                                         \
239         batadv_softif_vlan_put(vlan);                                   \
240         return res;                                                     \
241 }
242 
243 /* Use this, if you are going to turn a [name] in the vlan struct on or off */
244 #define BATADV_ATTR_VLAN_BOOL(_name, _mode, _post_func)                 \
245         static BATADV_ATTR_VLAN_STORE_BOOL(_name, _post_func)           \
246         static BATADV_ATTR_VLAN_SHOW_BOOL(_name)                        \
247         static BATADV_ATTR_VLAN(_name, _mode, batadv_show_vlan_##_name, \
248                                 batadv_store_vlan_##_name)
249 
250 #define BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min, _max, _post_func) \
251 ssize_t batadv_store_##_name(struct kobject *kobj,                      \
252                              struct attribute *attr, char *buff,        \
253                              size_t count)                              \
254 {                                                                       \
255         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
256         struct batadv_hard_iface *hard_iface;                           \
257         ssize_t length;                                                 \
258                                                                         \
259         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
260         if (!hard_iface)                                                \
261                 return 0;                                               \
262                                                                         \
263         length = __batadv_store_uint_attr(buff, count, _min, _max,      \
264                                           _post_func, attr,             \
265                                           &hard_iface->_var, net_dev);  \
266                                                                         \
267         batadv_hardif_put(hard_iface);                          \
268         return length;                                                  \
269 }
270 
271 #define BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                          \
272 ssize_t batadv_show_##_name(struct kobject *kobj,                       \
273                             struct attribute *attr, char *buff)         \
274 {                                                                       \
275         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);       \
276         struct batadv_hard_iface *hard_iface;                           \
277         ssize_t length;                                                 \
278                                                                         \
279         hard_iface = batadv_hardif_get_by_netdev(net_dev);              \
280         if (!hard_iface)                                                \
281                 return 0;                                               \
282                                                                         \
283         length = sprintf(buff, "%i\n", atomic_read(&hard_iface->_var)); \
284                                                                         \
285         batadv_hardif_put(hard_iface);                          \
286         return length;                                                  \
287 }
288 
289 /* Use this, if you are going to set [name] in hard_iface to an
290  * unsigned integer value
291  */
292 #define BATADV_ATTR_HIF_UINT(_name, _var, _mode, _min, _max, _post_func)\
293         static BATADV_ATTR_HIF_STORE_UINT(_name, _var, _min,            \
294                                           _max, _post_func)             \
295         static BATADV_ATTR_HIF_SHOW_UINT(_name, _var)                   \
296         static BATADV_ATTR(_name, _mode, batadv_show_##_name,           \
297                            batadv_store_##_name)
298 
299 static int batadv_store_bool_attr(char *buff, size_t count,
300                                   struct net_device *net_dev,
301                                   const char *attr_name, atomic_t *attr,
302                                   bool *changed)
303 {
304         int enabled = -1;
305 
306         *changed = false;
307 
308         if (buff[count - 1] == '\n')
309                 buff[count - 1] = '\0';
310 
311         if ((strncmp(buff, "1", 2) == 0) ||
312             (strncmp(buff, "enable", 7) == 0) ||
313             (strncmp(buff, "enabled", 8) == 0))
314                 enabled = 1;
315 
316         if ((strncmp(buff, "", 2) == 0) ||
317             (strncmp(buff, "disable", 8) == 0) ||
318             (strncmp(buff, "disabled", 9) == 0))
319                 enabled = 0;
320 
321         if (enabled < 0) {
322                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
323                             attr_name, buff);
324                 return -EINVAL;
325         }
326 
327         if (atomic_read(attr) == enabled)
328                 return count;
329 
330         batadv_info(net_dev, "%s: Changing from: %s to: %s\n", attr_name,
331                     atomic_read(attr) == 1 ? "enabled" : "disabled",
332                     enabled == 1 ? "enabled" : "disabled");
333 
334         *changed = true;
335 
336         atomic_set(attr, (unsigned int)enabled);
337         return count;
338 }
339 
340 static inline ssize_t
341 __batadv_store_bool_attr(char *buff, size_t count,
342                          void (*post_func)(struct net_device *),
343                          struct attribute *attr,
344                          atomic_t *attr_store, struct net_device *net_dev)
345 {
346         bool changed;
347         int ret;
348 
349         ret = batadv_store_bool_attr(buff, count, net_dev, attr->name,
350                                      attr_store, &changed);
351         if (post_func && changed)
352                 post_func(net_dev);
353 
354         return ret;
355 }
356 
357 static int batadv_store_uint_attr(const char *buff, size_t count,
358                                   struct net_device *net_dev,
359                                   const char *attr_name,
360                                   unsigned int min, unsigned int max,
361                                   atomic_t *attr)
362 {
363         unsigned long uint_val;
364         int ret;
365 
366         ret = kstrtoul(buff, 10, &uint_val);
367         if (ret) {
368                 batadv_info(net_dev, "%s: Invalid parameter received: %s\n",
369                             attr_name, buff);
370                 return -EINVAL;
371         }
372 
373         if (uint_val < min) {
374                 batadv_info(net_dev, "%s: Value is too small: %lu min: %u\n",
375                             attr_name, uint_val, min);
376                 return -EINVAL;
377         }
378 
379         if (uint_val > max) {
380                 batadv_info(net_dev, "%s: Value is too big: %lu max: %u\n",
381                             attr_name, uint_val, max);
382                 return -EINVAL;
383         }
384 
385         if (atomic_read(attr) == uint_val)
386                 return count;
387 
388         batadv_info(net_dev, "%s: Changing from: %i to: %lu\n",
389                     attr_name, atomic_read(attr), uint_val);
390 
391         atomic_set(attr, uint_val);
392         return count;
393 }
394 
395 static ssize_t __batadv_store_uint_attr(const char *buff, size_t count,
396                                         int min, int max,
397                                         void (*post_func)(struct net_device *),
398                                         const struct attribute *attr,
399                                         atomic_t *attr_store,
400                                         struct net_device *net_dev)
401 {
402         int ret;
403 
404         ret = batadv_store_uint_attr(buff, count, net_dev, attr->name, min, max,
405                                      attr_store);
406         if (post_func && ret)
407                 post_func(net_dev);
408 
409         return ret;
410 }
411 
412 static ssize_t batadv_show_bat_algo(struct kobject *kobj,
413                                     struct attribute *attr, char *buff)
414 {
415         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
416 
417         return sprintf(buff, "%s\n", bat_priv->algo_ops->name);
418 }
419 
420 static void batadv_post_gw_reselect(struct net_device *net_dev)
421 {
422         struct batadv_priv *bat_priv = netdev_priv(net_dev);
423 
424         batadv_gw_reselect(bat_priv);
425 }
426 
427 static ssize_t batadv_show_gw_mode(struct kobject *kobj, struct attribute *attr,
428                                    char *buff)
429 {
430         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
431         int bytes_written;
432 
433         /* GW mode is not available if the routing algorithm in use does not
434          * implement the GW API
435          */
436         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
437             !bat_priv->algo_ops->gw.is_eligible)
438                 return -ENOENT;
439 
440         switch (atomic_read(&bat_priv->gw.mode)) {
441         case BATADV_GW_MODE_CLIENT:
442                 bytes_written = sprintf(buff, "%s\n",
443                                         BATADV_GW_MODE_CLIENT_NAME);
444                 break;
445         case BATADV_GW_MODE_SERVER:
446                 bytes_written = sprintf(buff, "%s\n",
447                                         BATADV_GW_MODE_SERVER_NAME);
448                 break;
449         default:
450                 bytes_written = sprintf(buff, "%s\n",
451                                         BATADV_GW_MODE_OFF_NAME);
452                 break;
453         }
454 
455         return bytes_written;
456 }
457 
458 static ssize_t batadv_store_gw_mode(struct kobject *kobj,
459                                     struct attribute *attr, char *buff,
460                                     size_t count)
461 {
462         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
463         struct batadv_priv *bat_priv = netdev_priv(net_dev);
464         char *curr_gw_mode_str;
465         int gw_mode_tmp = -1;
466 
467         /* toggling GW mode is allowed only if the routing algorithm in use
468          * provides the GW API
469          */
470         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
471             !bat_priv->algo_ops->gw.is_eligible)
472                 return -EINVAL;
473 
474         if (buff[count - 1] == '\n')
475                 buff[count - 1] = '\0';
476 
477         if (strncmp(buff, BATADV_GW_MODE_OFF_NAME,
478                     strlen(BATADV_GW_MODE_OFF_NAME)) == 0)
479                 gw_mode_tmp = BATADV_GW_MODE_OFF;
480 
481         if (strncmp(buff, BATADV_GW_MODE_CLIENT_NAME,
482                     strlen(BATADV_GW_MODE_CLIENT_NAME)) == 0)
483                 gw_mode_tmp = BATADV_GW_MODE_CLIENT;
484 
485         if (strncmp(buff, BATADV_GW_MODE_SERVER_NAME,
486                     strlen(BATADV_GW_MODE_SERVER_NAME)) == 0)
487                 gw_mode_tmp = BATADV_GW_MODE_SERVER;
488 
489         if (gw_mode_tmp < 0) {
490                 batadv_info(net_dev,
491                             "Invalid parameter for 'gw mode' setting received: %s\n",
492                             buff);
493                 return -EINVAL;
494         }
495 
496         if (atomic_read(&bat_priv->gw.mode) == gw_mode_tmp)
497                 return count;
498 
499         switch (atomic_read(&bat_priv->gw.mode)) {
500         case BATADV_GW_MODE_CLIENT:
501                 curr_gw_mode_str = BATADV_GW_MODE_CLIENT_NAME;
502                 break;
503         case BATADV_GW_MODE_SERVER:
504                 curr_gw_mode_str = BATADV_GW_MODE_SERVER_NAME;
505                 break;
506         default:
507                 curr_gw_mode_str = BATADV_GW_MODE_OFF_NAME;
508                 break;
509         }
510 
511         batadv_info(net_dev, "Changing gw mode from: %s to: %s\n",
512                     curr_gw_mode_str, buff);
513 
514         /* Invoking batadv_gw_reselect() is not enough to really de-select the
515          * current GW. It will only instruct the gateway client code to perform
516          * a re-election the next time that this is needed.
517          *
518          * When gw client mode is being switched off the current GW must be
519          * de-selected explicitly otherwise no GW_ADD uevent is thrown on
520          * client mode re-activation. This is operation is performed in
521          * batadv_gw_check_client_stop().
522          */
523         batadv_gw_reselect(bat_priv);
524         /* always call batadv_gw_check_client_stop() before changing the gateway
525          * state
526          */
527         batadv_gw_check_client_stop(bat_priv);
528         atomic_set(&bat_priv->gw.mode, (unsigned int)gw_mode_tmp);
529         batadv_gw_tvlv_container_update(bat_priv);
530         return count;
531 }
532 
533 static ssize_t batadv_show_gw_sel_class(struct kobject *kobj,
534                                         struct attribute *attr, char *buff)
535 {
536         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
537 
538         /* GW selection class is not available if the routing algorithm in use
539          * does not implement the GW API
540          */
541         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
542             !bat_priv->algo_ops->gw.is_eligible)
543                 return -ENOENT;
544 
545         if (bat_priv->algo_ops->gw.show_sel_class)
546                 return bat_priv->algo_ops->gw.show_sel_class(bat_priv, buff);
547 
548         return sprintf(buff, "%i\n", atomic_read(&bat_priv->gw.sel_class));
549 }
550 
551 static ssize_t batadv_store_gw_sel_class(struct kobject *kobj,
552                                          struct attribute *attr, char *buff,
553                                          size_t count)
554 {
555         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
556 
557         /* setting the GW selection class is allowed only if the routing
558          * algorithm in use implements the GW API
559          */
560         if (!bat_priv->algo_ops->gw.get_best_gw_node ||
561             !bat_priv->algo_ops->gw.is_eligible)
562                 return -EINVAL;
563 
564         if (buff[count - 1] == '\n')
565                 buff[count - 1] = '\0';
566 
567         if (bat_priv->algo_ops->gw.store_sel_class)
568                 return bat_priv->algo_ops->gw.store_sel_class(bat_priv, buff,
569                                                               count);
570 
571         return __batadv_store_uint_attr(buff, count, 1, BATADV_TQ_MAX_VALUE,
572                                         batadv_post_gw_reselect, attr,
573                                         &bat_priv->gw.sel_class,
574                                         bat_priv->soft_iface);
575 }
576 
577 static ssize_t batadv_show_gw_bwidth(struct kobject *kobj,
578                                      struct attribute *attr, char *buff)
579 {
580         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
581         u32 down, up;
582 
583         down = atomic_read(&bat_priv->gw.bandwidth_down);
584         up = atomic_read(&bat_priv->gw.bandwidth_up);
585 
586         return sprintf(buff, "%u.%u/%u.%u MBit\n", down / 10,
587                        down % 10, up / 10, up % 10);
588 }
589 
590 static ssize_t batadv_store_gw_bwidth(struct kobject *kobj,
591                                       struct attribute *attr, char *buff,
592                                       size_t count)
593 {
594         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
595 
596         if (buff[count - 1] == '\n')
597                 buff[count - 1] = '\0';
598 
599         return batadv_gw_bandwidth_set(net_dev, buff, count);
600 }
601 
602 /**
603  * batadv_show_isolation_mark() - print the current isolation mark/mask
604  * @kobj: kobject representing the private mesh sysfs directory
605  * @attr: the batman-adv attribute the user is interacting with
606  * @buff: the buffer that will contain the data to send back to the user
607  *
608  * Return: the number of bytes written into 'buff' on success or a negative
609  * error code in case of failure
610  */
611 static ssize_t batadv_show_isolation_mark(struct kobject *kobj,
612                                           struct attribute *attr, char *buff)
613 {
614         struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
615 
616         return sprintf(buff, "%#.8x/%#.8x\n", bat_priv->isolation_mark,
617                        bat_priv->isolation_mark_mask);
618 }
619 
620 /**
621  * batadv_store_isolation_mark() - parse and store the isolation mark/mask
622  *  entered by the user
623  * @kobj: kobject representing the private mesh sysfs directory
624  * @attr: the batman-adv attribute the user is interacting with
625  * @buff: the buffer containing the user data
626  * @count: number of bytes in the buffer
627  *
628  * Return: 'count' on success or a negative error code in case of failure
629  */
630 static ssize_t batadv_store_isolation_mark(struct kobject *kobj,
631                                            struct attribute *attr, char *buff,
632                                            size_t count)
633 {
634         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
635         struct batadv_priv *bat_priv = netdev_priv(net_dev);
636         u32 mark, mask;
637         char *mask_ptr;
638 
639         /* parse the mask if it has been specified, otherwise assume the mask is
640          * the biggest possible
641          */
642         mask = 0xFFFFFFFF;
643         mask_ptr = strchr(buff, '/');
644         if (mask_ptr) {
645                 *mask_ptr = '\0';
646                 mask_ptr++;
647 
648                 /* the mask must be entered in hex base as it is going to be a
649                  * bitmask and not a prefix length
650                  */
651                 if (kstrtou32(mask_ptr, 16, &mask) < 0)
652                         return -EINVAL;
653         }
654 
655         /* the mark can be entered in any base */
656         if (kstrtou32(buff, 0, &mark) < 0)
657                 return -EINVAL;
658 
659         bat_priv->isolation_mark_mask = mask;
660         /* erase bits not covered by the mask */
661         bat_priv->isolation_mark = mark & bat_priv->isolation_mark_mask;
662 
663         batadv_info(net_dev,
664                     "New skb mark for extended isolation: %#.8x/%#.8x\n",
665                     bat_priv->isolation_mark, bat_priv->isolation_mark_mask);
666 
667         return count;
668 }
669 
670 BATADV_ATTR_SIF_BOOL(aggregated_ogms, 0644, NULL);
671 BATADV_ATTR_SIF_BOOL(bonding, 0644, NULL);
672 #ifdef CONFIG_BATMAN_ADV_BLA
673 BATADV_ATTR_SIF_BOOL(bridge_loop_avoidance, 0644, batadv_bla_status_update);
674 #endif
675 #ifdef CONFIG_BATMAN_ADV_DAT
676 BATADV_ATTR_SIF_BOOL(distributed_arp_table, 0644, batadv_dat_status_update);
677 #endif
678 BATADV_ATTR_SIF_BOOL(fragmentation, 0644, batadv_update_min_mtu);
679 static BATADV_ATTR(routing_algo, 0444, batadv_show_bat_algo, NULL);
680 static BATADV_ATTR(gw_mode, 0644, batadv_show_gw_mode, batadv_store_gw_mode);
681 BATADV_ATTR_SIF_UINT(orig_interval, orig_interval, 0644, 2 * BATADV_JITTER,
682                      INT_MAX, NULL);
683 BATADV_ATTR_SIF_UINT(hop_penalty, hop_penalty, 0644, 0, BATADV_TQ_MAX_VALUE,
684                      NULL);
685 static BATADV_ATTR(gw_sel_class, 0644, batadv_show_gw_sel_class,
686                    batadv_store_gw_sel_class);
687 static BATADV_ATTR(gw_bandwidth, 0644, batadv_show_gw_bwidth,
688                    batadv_store_gw_bwidth);
689 #ifdef CONFIG_BATMAN_ADV_MCAST
690 BATADV_ATTR_SIF_BOOL(multicast_mode, 0644, NULL);
691 #endif
692 #ifdef CONFIG_BATMAN_ADV_DEBUG
693 BATADV_ATTR_SIF_UINT(log_level, log_level, 0644, 0, BATADV_DBG_ALL, NULL);
694 #endif
695 #ifdef CONFIG_BATMAN_ADV_NC
696 BATADV_ATTR_SIF_BOOL(network_coding, 0644, batadv_nc_status_update);
697 #endif
698 static BATADV_ATTR(isolation_mark, 0644, batadv_show_isolation_mark,
699                    batadv_store_isolation_mark);
700 
701 static struct batadv_attribute *batadv_mesh_attrs[] = {
702         &batadv_attr_aggregated_ogms,
703         &batadv_attr_bonding,
704 #ifdef CONFIG_BATMAN_ADV_BLA
705         &batadv_attr_bridge_loop_avoidance,
706 #endif
707 #ifdef CONFIG_BATMAN_ADV_DAT
708         &batadv_attr_distributed_arp_table,
709 #endif
710 #ifdef CONFIG_BATMAN_ADV_MCAST
711         &batadv_attr_multicast_mode,
712 #endif
713         &batadv_attr_fragmentation,
714         &batadv_attr_routing_algo,
715         &batadv_attr_gw_mode,
716         &batadv_attr_orig_interval,
717         &batadv_attr_hop_penalty,
718         &batadv_attr_gw_sel_class,
719         &batadv_attr_gw_bandwidth,
720 #ifdef CONFIG_BATMAN_ADV_DEBUG
721         &batadv_attr_log_level,
722 #endif
723 #ifdef CONFIG_BATMAN_ADV_NC
724         &batadv_attr_network_coding,
725 #endif
726         &batadv_attr_isolation_mark,
727         NULL,
728 };
729 
730 BATADV_ATTR_VLAN_BOOL(ap_isolation, 0644, NULL);
731 
732 /* array of vlan specific sysfs attributes */
733 static struct batadv_attribute *batadv_vlan_attrs[] = {
734         &batadv_attr_vlan_ap_isolation,
735         NULL,
736 };
737 
738 /**
739  * batadv_sysfs_add_meshif() - Add soft interface specific sysfs entries
740  * @dev: netdev struct of the soft interface
741  *
742  * Return: 0 on success or negative error number in case of failure
743  */
744 int batadv_sysfs_add_meshif(struct net_device *dev)
745 {
746         struct kobject *batif_kobject = &dev->dev.kobj;
747         struct batadv_priv *bat_priv = netdev_priv(dev);
748         struct batadv_attribute **bat_attr;
749         int err;
750 
751         bat_priv->mesh_obj = kobject_create_and_add(BATADV_SYSFS_IF_MESH_SUBDIR,
752                                                     batif_kobject);
753         if (!bat_priv->mesh_obj) {
754                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
755                            BATADV_SYSFS_IF_MESH_SUBDIR);
756                 goto out;
757         }
758 
759         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr) {
760                 err = sysfs_create_file(bat_priv->mesh_obj,
761                                         &((*bat_attr)->attr));
762                 if (err) {
763                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
764                                    dev->name, BATADV_SYSFS_IF_MESH_SUBDIR,
765                                    ((*bat_attr)->attr).name);
766                         goto rem_attr;
767                 }
768         }
769 
770         return 0;
771 
772 rem_attr:
773         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
774                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
775 
776         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
777         kobject_del(bat_priv->mesh_obj);
778         kobject_put(bat_priv->mesh_obj);
779         bat_priv->mesh_obj = NULL;
780 out:
781         return -ENOMEM;
782 }
783 
784 /**
785  * batadv_sysfs_del_meshif() - Remove soft interface specific sysfs entries
786  * @dev: netdev struct of the soft interface
787  */
788 void batadv_sysfs_del_meshif(struct net_device *dev)
789 {
790         struct batadv_priv *bat_priv = netdev_priv(dev);
791         struct batadv_attribute **bat_attr;
792 
793         for (bat_attr = batadv_mesh_attrs; *bat_attr; ++bat_attr)
794                 sysfs_remove_file(bat_priv->mesh_obj, &((*bat_attr)->attr));
795 
796         kobject_uevent(bat_priv->mesh_obj, KOBJ_REMOVE);
797         kobject_del(bat_priv->mesh_obj);
798         kobject_put(bat_priv->mesh_obj);
799         bat_priv->mesh_obj = NULL;
800 }
801 
802 /**
803  * batadv_sysfs_add_vlan() - add all the needed sysfs objects for the new vlan
804  * @dev: netdev of the mesh interface
805  * @vlan: private data of the newly added VLAN interface
806  *
807  * Return: 0 on success and -ENOMEM if any of the structure allocations fails.
808  */
809 int batadv_sysfs_add_vlan(struct net_device *dev,
810                           struct batadv_softif_vlan *vlan)
811 {
812         char vlan_subdir[sizeof(BATADV_SYSFS_VLAN_SUBDIR_PREFIX) + 5];
813         struct batadv_priv *bat_priv = netdev_priv(dev);
814         struct batadv_attribute **bat_attr;
815         int err;
816 
817         if (vlan->vid & BATADV_VLAN_HAS_TAG) {
818                 sprintf(vlan_subdir, BATADV_SYSFS_VLAN_SUBDIR_PREFIX "%hu",
819                         vlan->vid & VLAN_VID_MASK);
820 
821                 vlan->kobj = kobject_create_and_add(vlan_subdir,
822                                                     bat_priv->mesh_obj);
823                 if (!vlan->kobj) {
824                         batadv_err(dev, "Can't add sysfs directory: %s/%s\n",
825                                    dev->name, vlan_subdir);
826                         goto out;
827                 }
828         } else {
829                 /* the untagged LAN uses the root folder to store its "VLAN
830                  * specific attributes"
831                  */
832                 vlan->kobj = bat_priv->mesh_obj;
833                 kobject_get(bat_priv->mesh_obj);
834         }
835 
836         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr) {
837                 err = sysfs_create_file(vlan->kobj,
838                                         &((*bat_attr)->attr));
839                 if (err) {
840                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
841                                    dev->name, vlan_subdir,
842                                    ((*bat_attr)->attr).name);
843                         goto rem_attr;
844                 }
845         }
846 
847         return 0;
848 
849 rem_attr:
850         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
851                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
852 
853         if (vlan->kobj != bat_priv->mesh_obj) {
854                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
855                 kobject_del(vlan->kobj);
856         }
857         kobject_put(vlan->kobj);
858         vlan->kobj = NULL;
859 out:
860         return -ENOMEM;
861 }
862 
863 /**
864  * batadv_sysfs_del_vlan() - remove all the sysfs objects for a given VLAN
865  * @bat_priv: the bat priv with all the soft interface information
866  * @vlan: the private data of the VLAN to destroy
867  */
868 void batadv_sysfs_del_vlan(struct batadv_priv *bat_priv,
869                            struct batadv_softif_vlan *vlan)
870 {
871         struct batadv_attribute **bat_attr;
872 
873         for (bat_attr = batadv_vlan_attrs; *bat_attr; ++bat_attr)
874                 sysfs_remove_file(vlan->kobj, &((*bat_attr)->attr));
875 
876         if (vlan->kobj != bat_priv->mesh_obj) {
877                 kobject_uevent(vlan->kobj, KOBJ_REMOVE);
878                 kobject_del(vlan->kobj);
879         }
880         kobject_put(vlan->kobj);
881         vlan->kobj = NULL;
882 }
883 
884 static ssize_t batadv_show_mesh_iface(struct kobject *kobj,
885                                       struct attribute *attr, char *buff)
886 {
887         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
888         struct batadv_hard_iface *hard_iface;
889         ssize_t length;
890         const char *ifname;
891 
892         hard_iface = batadv_hardif_get_by_netdev(net_dev);
893         if (!hard_iface)
894                 return 0;
895 
896         if (hard_iface->if_status == BATADV_IF_NOT_IN_USE)
897                 ifname =  "none";
898         else
899                 ifname = hard_iface->soft_iface->name;
900 
901         length = sprintf(buff, "%s\n", ifname);
902 
903         batadv_hardif_put(hard_iface);
904 
905         return length;
906 }
907 
908 /**
909  * batadv_store_mesh_iface_finish() - store new hardif mesh_iface state
910  * @net_dev: netdevice to add/remove to/from batman-adv soft-interface
911  * @ifname: name of soft-interface to modify
912  *
913  * Changes the parts of the hard+soft interface which can not be modified under
914  * sysfs lock (to prevent deadlock situations).
915  *
916  * Return: 0 on success, 0 < on failure
917  */
918 static int batadv_store_mesh_iface_finish(struct net_device *net_dev,
919                                           char ifname[IFNAMSIZ])
920 {
921         struct net *net = dev_net(net_dev);
922         struct batadv_hard_iface *hard_iface;
923         int status_tmp;
924         int ret = 0;
925 
926         ASSERT_RTNL();
927 
928         hard_iface = batadv_hardif_get_by_netdev(net_dev);
929         if (!hard_iface)
930                 return 0;
931 
932         if (strncmp(ifname, "none", 4) == 0)
933                 status_tmp = BATADV_IF_NOT_IN_USE;
934         else
935                 status_tmp = BATADV_IF_I_WANT_YOU;
936 
937         if (hard_iface->if_status == status_tmp)
938                 goto out;
939 
940         if (hard_iface->soft_iface &&
941             strncmp(hard_iface->soft_iface->name, ifname, IFNAMSIZ) == 0)
942                 goto out;
943 
944         if (status_tmp == BATADV_IF_NOT_IN_USE) {
945                 batadv_hardif_disable_interface(hard_iface,
946                                                 BATADV_IF_CLEANUP_AUTO);
947                 goto out;
948         }
949 
950         /* if the interface already is in use */
951         if (hard_iface->if_status != BATADV_IF_NOT_IN_USE)
952                 batadv_hardif_disable_interface(hard_iface,
953                                                 BATADV_IF_CLEANUP_AUTO);
954 
955         ret = batadv_hardif_enable_interface(hard_iface, net, ifname);
956 out:
957         batadv_hardif_put(hard_iface);
958         return ret;
959 }
960 
961 /**
962  * batadv_store_mesh_iface_work() - store new hardif mesh_iface state
963  * @work: work queue item
964  *
965  * Changes the parts of the hard+soft interface which can not be modified under
966  * sysfs lock (to prevent deadlock situations).
967  */
968 static void batadv_store_mesh_iface_work(struct work_struct *work)
969 {
970         struct batadv_store_mesh_work *store_work;
971         int ret;
972 
973         store_work = container_of(work, struct batadv_store_mesh_work, work);
974 
975         rtnl_lock();
976         ret = batadv_store_mesh_iface_finish(store_work->net_dev,
977                                              store_work->soft_iface_name);
978         rtnl_unlock();
979 
980         if (ret < 0)
981                 pr_err("Failed to store new mesh_iface state %s for %s: %d\n",
982                        store_work->soft_iface_name, store_work->net_dev->name,
983                        ret);
984 
985         dev_put(store_work->net_dev);
986         kfree(store_work);
987 }
988 
989 static ssize_t batadv_store_mesh_iface(struct kobject *kobj,
990                                        struct attribute *attr, char *buff,
991                                        size_t count)
992 {
993         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
994         struct batadv_store_mesh_work *store_work;
995 
996         if (buff[count - 1] == '\n')
997                 buff[count - 1] = '\0';
998 
999         if (strlen(buff) >= IFNAMSIZ) {
1000                 pr_err("Invalid parameter for 'mesh_iface' setting received: interface name too long '%s'\n",
1001                        buff);
1002                 return -EINVAL;
1003         }
1004 
1005         store_work = kmalloc(sizeof(*store_work), GFP_KERNEL);
1006         if (!store_work)
1007                 return -ENOMEM;
1008 
1009         dev_hold(net_dev);
1010         INIT_WORK(&store_work->work, batadv_store_mesh_iface_work);
1011         store_work->net_dev = net_dev;
1012         strlcpy(store_work->soft_iface_name, buff,
1013                 sizeof(store_work->soft_iface_name));
1014 
1015         queue_work(batadv_event_workqueue, &store_work->work);
1016 
1017         return count;
1018 }
1019 
1020 static ssize_t batadv_show_iface_status(struct kobject *kobj,
1021                                         struct attribute *attr, char *buff)
1022 {
1023         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1024         struct batadv_hard_iface *hard_iface;
1025         ssize_t length;
1026 
1027         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1028         if (!hard_iface)
1029                 return 0;
1030 
1031         switch (hard_iface->if_status) {
1032         case BATADV_IF_TO_BE_REMOVED:
1033                 length = sprintf(buff, "disabling\n");
1034                 break;
1035         case BATADV_IF_INACTIVE:
1036                 length = sprintf(buff, "inactive\n");
1037                 break;
1038         case BATADV_IF_ACTIVE:
1039                 length = sprintf(buff, "active\n");
1040                 break;
1041         case BATADV_IF_TO_BE_ACTIVATED:
1042                 length = sprintf(buff, "enabling\n");
1043                 break;
1044         case BATADV_IF_NOT_IN_USE:
1045         default:
1046                 length = sprintf(buff, "not in use\n");
1047                 break;
1048         }
1049 
1050         batadv_hardif_put(hard_iface);
1051 
1052         return length;
1053 }
1054 
1055 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1056 
1057 /**
1058  * batadv_store_throughput_override() - parse and store throughput override
1059  *  entered by the user
1060  * @kobj: kobject representing the private mesh sysfs directory
1061  * @attr: the batman-adv attribute the user is interacting with
1062  * @buff: the buffer containing the user data
1063  * @count: number of bytes in the buffer
1064  *
1065  * Return: 'count' on success or a negative error code in case of failure
1066  */
1067 static ssize_t batadv_store_throughput_override(struct kobject *kobj,
1068                                                 struct attribute *attr,
1069                                                 char *buff, size_t count)
1070 {
1071         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1072         struct batadv_hard_iface *hard_iface;
1073         u32 tp_override;
1074         u32 old_tp_override;
1075         bool ret;
1076 
1077         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1078         if (!hard_iface)
1079                 return -EINVAL;
1080 
1081         if (buff[count - 1] == '\n')
1082                 buff[count - 1] = '\0';
1083 
1084         ret = batadv_parse_throughput(net_dev, buff, "throughput_override",
1085                                       &tp_override);
1086         if (!ret)
1087                 return count;
1088 
1089         old_tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1090         if (old_tp_override == tp_override)
1091                 goto out;
1092 
1093         batadv_info(net_dev, "%s: Changing from: %u.%u MBit to: %u.%u MBit\n",
1094                     "throughput_override",
1095                     old_tp_override / 10, old_tp_override % 10,
1096                     tp_override / 10, tp_override % 10);
1097 
1098         atomic_set(&hard_iface->bat_v.throughput_override, tp_override);
1099 
1100 out:
1101         batadv_hardif_put(hard_iface);
1102         return count;
1103 }
1104 
1105 static ssize_t batadv_show_throughput_override(struct kobject *kobj,
1106                                                struct attribute *attr,
1107                                                char *buff)
1108 {
1109         struct net_device *net_dev = batadv_kobj_to_netdev(kobj);
1110         struct batadv_hard_iface *hard_iface;
1111         u32 tp_override;
1112 
1113         hard_iface = batadv_hardif_get_by_netdev(net_dev);
1114         if (!hard_iface)
1115                 return -EINVAL;
1116 
1117         tp_override = atomic_read(&hard_iface->bat_v.throughput_override);
1118 
1119         return sprintf(buff, "%u.%u MBit\n", tp_override / 10,
1120                        tp_override % 10);
1121 }
1122 
1123 #endif
1124 
1125 static BATADV_ATTR(mesh_iface, 0644, batadv_show_mesh_iface,
1126                    batadv_store_mesh_iface);
1127 static BATADV_ATTR(iface_status, 0444, batadv_show_iface_status, NULL);
1128 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1129 BATADV_ATTR_HIF_UINT(elp_interval, bat_v.elp_interval, 0644,
1130                      2 * BATADV_JITTER, INT_MAX, NULL);
1131 static BATADV_ATTR(throughput_override, 0644, batadv_show_throughput_override,
1132                    batadv_store_throughput_override);
1133 #endif
1134 
1135 static struct batadv_attribute *batadv_batman_attrs[] = {
1136         &batadv_attr_mesh_iface,
1137         &batadv_attr_iface_status,
1138 #ifdef CONFIG_BATMAN_ADV_BATMAN_V
1139         &batadv_attr_elp_interval,
1140         &batadv_attr_throughput_override,
1141 #endif
1142         NULL,
1143 };
1144 
1145 /**
1146  * batadv_sysfs_add_hardif() - Add hard interface specific sysfs entries
1147  * @hardif_obj: address where to store the pointer to new sysfs folder
1148  * @dev: netdev struct of the hard interface
1149  *
1150  * Return: 0 on success or negative error number in case of failure
1151  */
1152 int batadv_sysfs_add_hardif(struct kobject **hardif_obj, struct net_device *dev)
1153 {
1154         struct kobject *hardif_kobject = &dev->dev.kobj;
1155         struct batadv_attribute **bat_attr;
1156         int err;
1157 
1158         *hardif_obj = kobject_create_and_add(BATADV_SYSFS_IF_BAT_SUBDIR,
1159                                              hardif_kobject);
1160 
1161         if (!*hardif_obj) {
1162                 batadv_err(dev, "Can't add sysfs directory: %s/%s\n", dev->name,
1163                            BATADV_SYSFS_IF_BAT_SUBDIR);
1164                 goto out;
1165         }
1166 
1167         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr) {
1168                 err = sysfs_create_file(*hardif_obj, &((*bat_attr)->attr));
1169                 if (err) {
1170                         batadv_err(dev, "Can't add sysfs file: %s/%s/%s\n",
1171                                    dev->name, BATADV_SYSFS_IF_BAT_SUBDIR,
1172                                    ((*bat_attr)->attr).name);
1173                         goto rem_attr;
1174                 }
1175         }
1176 
1177         return 0;
1178 
1179 rem_attr:
1180         for (bat_attr = batadv_batman_attrs; *bat_attr; ++bat_attr)
1181                 sysfs_remove_file(*hardif_obj, &((*bat_attr)->attr));
1182 out:
1183         return -ENOMEM;
1184 }
1185 
1186 /**
1187  * batadv_sysfs_del_hardif() - Remove hard interface specific sysfs entries
1188  * @hardif_obj: address to the pointer to which stores batman-adv sysfs folder
1189  *  of the hard interface
1190  */
1191 void batadv_sysfs_del_hardif(struct kobject **hardif_obj)
1192 {
1193         kobject_uevent(*hardif_obj, KOBJ_REMOVE);
1194         kobject_del(*hardif_obj);
1195         kobject_put(*hardif_obj);
1196         *hardif_obj = NULL;
1197 }
1198 
1199 /**
1200  * batadv_throw_uevent() - Send an uevent with batman-adv specific env data
1201  * @bat_priv: the bat priv with all the soft interface information
1202  * @type: subsystem type of event. Stored in uevent's BATTYPE
1203  * @action: action type of event. Stored in uevent's BATACTION
1204  * @data: string with additional information to the event (ignored for
1205  *  BATADV_UEV_DEL). Stored in uevent's BATDATA
1206  *
1207  * Return: 0 on success or negative error number in case of failure
1208  */
1209 int batadv_throw_uevent(struct batadv_priv *bat_priv, enum batadv_uev_type type,
1210                         enum batadv_uev_action action, const char *data)
1211 {
1212         int ret = -ENOMEM;
1213         struct kobject *bat_kobj;
1214         char *uevent_env[4] = { NULL, NULL, NULL, NULL };
1215 
1216         bat_kobj = &bat_priv->soft_iface->dev.kobj;
1217 
1218         uevent_env[0] = kasprintf(GFP_ATOMIC,
1219                                   "%s%s", BATADV_UEV_TYPE_VAR,
1220                                   batadv_uev_type_str[type]);
1221         if (!uevent_env[0])
1222                 goto out;
1223 
1224         uevent_env[1] = kasprintf(GFP_ATOMIC,
1225                                   "%s%s", BATADV_UEV_ACTION_VAR,
1226                                   batadv_uev_action_str[action]);
1227         if (!uevent_env[1])
1228                 goto out;
1229 
1230         /* If the event is DEL, ignore the data field */
1231         if (action != BATADV_UEV_DEL) {
1232                 uevent_env[2] = kasprintf(GFP_ATOMIC,
1233                                           "%s%s", BATADV_UEV_DATA_VAR, data);
1234                 if (!uevent_env[2])
1235                         goto out;
1236         }
1237 
1238         ret = kobject_uevent_env(bat_kobj, KOBJ_CHANGE, uevent_env);
1239 out:
1240         kfree(uevent_env[0]);
1241         kfree(uevent_env[1]);
1242         kfree(uevent_env[2]);
1243 
1244         if (ret)
1245                 batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
1246                            "Impossible to send uevent for (%s,%s,%s) event (err: %d)\n",
1247                            batadv_uev_type_str[type],
1248                            batadv_uev_action_str[action],
1249                            (action == BATADV_UEV_DEL ? "NULL" : data), ret);
1250         return ret;
1251 }
1252 

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