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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