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9f6446c7 | 1 | /* Copyright (C) 2009-2015 B.A.T.M.A.N. contributors: |
c6c8fea2 SE |
2 | * |
3 | * Marek Lindner, Simon Wunderlich | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or | |
6 | * modify it under the terms of version 2 of the GNU General Public | |
7 | * License as published by the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but | |
10 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | * General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
c6c8fea2 SE |
16 | */ |
17 | ||
1e2c2a4f | 18 | #include "originator.h" |
c6c8fea2 | 19 | #include "main.h" |
1e2c2a4f SE |
20 | |
21 | #include <linux/errno.h> | |
22 | #include <linux/etherdevice.h> | |
23 | #include <linux/fs.h> | |
24 | #include <linux/jiffies.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/list.h> | |
27 | #include <linux/lockdep.h> | |
28 | #include <linux/netdevice.h> | |
d0fa4f3f | 29 | #include <linux/rculist.h> |
1e2c2a4f SE |
30 | #include <linux/seq_file.h> |
31 | #include <linux/slab.h> | |
32 | #include <linux/spinlock.h> | |
33 | #include <linux/workqueue.h> | |
34 | ||
785ea114 | 35 | #include "distributed-arp-table.h" |
1e2c2a4f | 36 | #include "fragmentation.h" |
c6c8fea2 SE |
37 | #include "gateway_client.h" |
38 | #include "hard-interface.h" | |
1e2c2a4f | 39 | #include "hash.h" |
60432d75 | 40 | #include "multicast.h" |
1e2c2a4f SE |
41 | #include "network-coding.h" |
42 | #include "routing.h" | |
43 | #include "translation-table.h" | |
c6c8fea2 | 44 | |
dec05074 AQ |
45 | /* hash class keys */ |
46 | static struct lock_class_key batadv_orig_hash_lock_class_key; | |
47 | ||
03fc7f86 | 48 | static void batadv_purge_orig(struct work_struct *work); |
c6c8fea2 | 49 | |
b8e2dd13 | 50 | /* returns 1 if they are the same originator */ |
bbad0a5e | 51 | int batadv_compare_orig(const struct hlist_node *node, const void *data2) |
b8e2dd13 | 52 | { |
56303d34 SE |
53 | const void *data1 = container_of(node, struct batadv_orig_node, |
54 | hash_entry); | |
b8e2dd13 | 55 | |
323813ed | 56 | return batadv_compare_eth(data1, data2); |
b8e2dd13 SE |
57 | } |
58 | ||
7ea7b4a1 AQ |
59 | /** |
60 | * batadv_orig_node_vlan_get - get an orig_node_vlan object | |
61 | * @orig_node: the originator serving the VLAN | |
62 | * @vid: the VLAN identifier | |
63 | * | |
64 | * Returns the vlan object identified by vid and belonging to orig_node or NULL | |
65 | * if it does not exist. | |
66 | */ | |
67 | struct batadv_orig_node_vlan * | |
68 | batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, | |
69 | unsigned short vid) | |
70 | { | |
71 | struct batadv_orig_node_vlan *vlan = NULL, *tmp; | |
72 | ||
73 | rcu_read_lock(); | |
d0fa4f3f | 74 | hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) { |
7ea7b4a1 AQ |
75 | if (tmp->vid != vid) |
76 | continue; | |
77 | ||
78 | if (!atomic_inc_not_zero(&tmp->refcount)) | |
79 | continue; | |
80 | ||
81 | vlan = tmp; | |
82 | ||
83 | break; | |
84 | } | |
85 | rcu_read_unlock(); | |
86 | ||
87 | return vlan; | |
88 | } | |
89 | ||
90 | /** | |
91 | * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan | |
92 | * object | |
93 | * @orig_node: the originator serving the VLAN | |
94 | * @vid: the VLAN identifier | |
95 | * | |
96 | * Returns NULL in case of failure or the vlan object identified by vid and | |
97 | * belonging to orig_node otherwise. The object is created and added to the list | |
98 | * if it does not exist. | |
99 | * | |
100 | * The object is returned with refcounter increased by 1. | |
101 | */ | |
102 | struct batadv_orig_node_vlan * | |
103 | batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, | |
104 | unsigned short vid) | |
105 | { | |
106 | struct batadv_orig_node_vlan *vlan; | |
107 | ||
108 | spin_lock_bh(&orig_node->vlan_list_lock); | |
109 | ||
110 | /* first look if an object for this vid already exists */ | |
111 | vlan = batadv_orig_node_vlan_get(orig_node, vid); | |
112 | if (vlan) | |
113 | goto out; | |
114 | ||
115 | vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); | |
116 | if (!vlan) | |
117 | goto out; | |
118 | ||
119 | atomic_set(&vlan->refcount, 2); | |
120 | vlan->vid = vid; | |
121 | ||
d0fa4f3f | 122 | hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list); |
7ea7b4a1 AQ |
123 | |
124 | out: | |
125 | spin_unlock_bh(&orig_node->vlan_list_lock); | |
126 | ||
127 | return vlan; | |
128 | } | |
129 | ||
130 | /** | |
131 | * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly free | |
132 | * the originator-vlan object | |
133 | * @orig_vlan: the originator-vlan object to release | |
134 | */ | |
135 | void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan) | |
136 | { | |
137 | if (atomic_dec_and_test(&orig_vlan->refcount)) | |
138 | kfree_rcu(orig_vlan, rcu); | |
139 | } | |
140 | ||
56303d34 | 141 | int batadv_originator_init(struct batadv_priv *bat_priv) |
c6c8fea2 SE |
142 | { |
143 | if (bat_priv->orig_hash) | |
5346c35e | 144 | return 0; |
c6c8fea2 | 145 | |
1a8eaf07 | 146 | bat_priv->orig_hash = batadv_hash_new(1024); |
c6c8fea2 SE |
147 | |
148 | if (!bat_priv->orig_hash) | |
149 | goto err; | |
150 | ||
dec05074 AQ |
151 | batadv_hash_set_lock_class(bat_priv->orig_hash, |
152 | &batadv_orig_hash_lock_class_key); | |
153 | ||
72414442 AQ |
154 | INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); |
155 | queue_delayed_work(batadv_event_workqueue, | |
156 | &bat_priv->orig_work, | |
157 | msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); | |
158 | ||
5346c35e | 159 | return 0; |
c6c8fea2 SE |
160 | |
161 | err: | |
5346c35e | 162 | return -ENOMEM; |
c6c8fea2 SE |
163 | } |
164 | ||
89652331 SW |
165 | /** |
166 | * batadv_neigh_ifinfo_free_rcu - free the neigh_ifinfo object | |
167 | * @rcu: rcu pointer of the neigh_ifinfo object | |
168 | */ | |
169 | static void batadv_neigh_ifinfo_free_rcu(struct rcu_head *rcu) | |
170 | { | |
171 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
172 | ||
173 | neigh_ifinfo = container_of(rcu, struct batadv_neigh_ifinfo, rcu); | |
174 | ||
175 | if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT) | |
176 | batadv_hardif_free_ref_now(neigh_ifinfo->if_outgoing); | |
177 | ||
178 | kfree(neigh_ifinfo); | |
179 | } | |
180 | ||
181 | /** | |
182 | * batadv_neigh_ifinfo_free_now - decrement the refcounter and possibly free | |
183 | * the neigh_ifinfo (without rcu callback) | |
184 | * @neigh_ifinfo: the neigh_ifinfo object to release | |
185 | */ | |
186 | static void | |
187 | batadv_neigh_ifinfo_free_ref_now(struct batadv_neigh_ifinfo *neigh_ifinfo) | |
188 | { | |
189 | if (atomic_dec_and_test(&neigh_ifinfo->refcount)) | |
190 | batadv_neigh_ifinfo_free_rcu(&neigh_ifinfo->rcu); | |
191 | } | |
192 | ||
193 | /** | |
194 | * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly free | |
195 | * the neigh_ifinfo | |
196 | * @neigh_ifinfo: the neigh_ifinfo object to release | |
197 | */ | |
198 | void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo) | |
199 | { | |
200 | if (atomic_dec_and_test(&neigh_ifinfo->refcount)) | |
201 | call_rcu(&neigh_ifinfo->rcu, batadv_neigh_ifinfo_free_rcu); | |
202 | } | |
203 | ||
cef63419 ML |
204 | /** |
205 | * batadv_hardif_neigh_free_rcu - free the hardif neigh_node | |
206 | * @rcu: rcu pointer of the neigh_node | |
207 | */ | |
208 | static void batadv_hardif_neigh_free_rcu(struct rcu_head *rcu) | |
209 | { | |
210 | struct batadv_hardif_neigh_node *hardif_neigh; | |
211 | ||
212 | hardif_neigh = container_of(rcu, struct batadv_hardif_neigh_node, rcu); | |
213 | ||
cef63419 ML |
214 | batadv_hardif_free_ref_now(hardif_neigh->if_incoming); |
215 | kfree(hardif_neigh); | |
216 | } | |
217 | ||
218 | /** | |
219 | * batadv_hardif_neigh_free_now - decrement the hardif neighbors refcounter | |
220 | * and possibly free it (without rcu callback) | |
221 | * @hardif_neigh: hardif neigh neighbor to free | |
222 | */ | |
223 | static void | |
224 | batadv_hardif_neigh_free_now(struct batadv_hardif_neigh_node *hardif_neigh) | |
225 | { | |
bab7c6c3 SE |
226 | if (atomic_dec_and_test(&hardif_neigh->refcount)) { |
227 | spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock); | |
228 | hlist_del_init_rcu(&hardif_neigh->list); | |
229 | spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock); | |
230 | ||
cef63419 | 231 | batadv_hardif_neigh_free_rcu(&hardif_neigh->rcu); |
bab7c6c3 | 232 | } |
cef63419 ML |
233 | } |
234 | ||
235 | /** | |
236 | * batadv_hardif_neigh_free_ref - decrement the hardif neighbors refcounter | |
237 | * and possibly free it | |
238 | * @hardif_neigh: hardif neigh neighbor to free | |
239 | */ | |
240 | void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh) | |
241 | { | |
bab7c6c3 SE |
242 | if (atomic_dec_and_test(&hardif_neigh->refcount)) { |
243 | spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock); | |
244 | hlist_del_init_rcu(&hardif_neigh->list); | |
245 | spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock); | |
246 | ||
cef63419 | 247 | call_rcu(&hardif_neigh->rcu, batadv_hardif_neigh_free_rcu); |
bab7c6c3 | 248 | } |
cef63419 ML |
249 | } |
250 | ||
89652331 SW |
251 | /** |
252 | * batadv_neigh_node_free_rcu - free the neigh_node | |
253 | * @rcu: rcu pointer of the neigh_node | |
254 | */ | |
255 | static void batadv_neigh_node_free_rcu(struct rcu_head *rcu) | |
256 | { | |
257 | struct hlist_node *node_tmp; | |
258 | struct batadv_neigh_node *neigh_node; | |
cef63419 | 259 | struct batadv_hardif_neigh_node *hardif_neigh; |
89652331 | 260 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
bcef1f3c | 261 | struct batadv_algo_ops *bao; |
89652331 SW |
262 | |
263 | neigh_node = container_of(rcu, struct batadv_neigh_node, rcu); | |
bcef1f3c | 264 | bao = neigh_node->orig_node->bat_priv->bat_algo_ops; |
89652331 SW |
265 | |
266 | hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, | |
267 | &neigh_node->ifinfo_list, list) { | |
268 | batadv_neigh_ifinfo_free_ref_now(neigh_ifinfo); | |
269 | } | |
bcef1f3c | 270 | |
cef63419 ML |
271 | hardif_neigh = batadv_hardif_neigh_get(neigh_node->if_incoming, |
272 | neigh_node->addr); | |
273 | if (hardif_neigh) { | |
274 | /* batadv_hardif_neigh_get() increases refcount too */ | |
275 | batadv_hardif_neigh_free_now(hardif_neigh); | |
276 | batadv_hardif_neigh_free_now(hardif_neigh); | |
277 | } | |
278 | ||
bcef1f3c AQ |
279 | if (bao->bat_neigh_free) |
280 | bao->bat_neigh_free(neigh_node); | |
281 | ||
89652331 SW |
282 | batadv_hardif_free_ref_now(neigh_node->if_incoming); |
283 | ||
284 | kfree(neigh_node); | |
285 | } | |
286 | ||
287 | /** | |
288 | * batadv_neigh_node_free_ref_now - decrement the neighbors refcounter | |
289 | * and possibly free it (without rcu callback) | |
290 | * @neigh_node: neigh neighbor to free | |
291 | */ | |
292 | static void | |
293 | batadv_neigh_node_free_ref_now(struct batadv_neigh_node *neigh_node) | |
294 | { | |
295 | if (atomic_dec_and_test(&neigh_node->refcount)) | |
296 | batadv_neigh_node_free_rcu(&neigh_node->rcu); | |
297 | } | |
298 | ||
299 | /** | |
300 | * batadv_neigh_node_free_ref - decrement the neighbors refcounter | |
301 | * and possibly free it | |
302 | * @neigh_node: neigh neighbor to free | |
303 | */ | |
56303d34 | 304 | void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node) |
a4c135c5 | 305 | { |
44524fcd | 306 | if (atomic_dec_and_test(&neigh_node->refcount)) |
89652331 | 307 | call_rcu(&neigh_node->rcu, batadv_neigh_node_free_rcu); |
a4c135c5 SW |
308 | } |
309 | ||
7351a482 SW |
310 | /** |
311 | * batadv_orig_node_get_router - router to the originator depending on iface | |
312 | * @orig_node: the orig node for the router | |
313 | * @if_outgoing: the interface where the payload packet has been received or | |
314 | * the OGM should be sent to | |
315 | * | |
316 | * Returns the neighbor which should be router for this orig_node/iface. | |
317 | * | |
318 | * The object is returned with refcounter increased by 1. | |
319 | */ | |
56303d34 | 320 | struct batadv_neigh_node * |
7351a482 SW |
321 | batadv_orig_router_get(struct batadv_orig_node *orig_node, |
322 | const struct batadv_hard_iface *if_outgoing) | |
e1a5382f | 323 | { |
7351a482 SW |
324 | struct batadv_orig_ifinfo *orig_ifinfo; |
325 | struct batadv_neigh_node *router = NULL; | |
e1a5382f LL |
326 | |
327 | rcu_read_lock(); | |
7351a482 SW |
328 | hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) { |
329 | if (orig_ifinfo->if_outgoing != if_outgoing) | |
330 | continue; | |
331 | ||
332 | router = rcu_dereference(orig_ifinfo->router); | |
333 | break; | |
334 | } | |
e1a5382f LL |
335 | |
336 | if (router && !atomic_inc_not_zero(&router->refcount)) | |
337 | router = NULL; | |
338 | ||
339 | rcu_read_unlock(); | |
340 | return router; | |
341 | } | |
342 | ||
7351a482 SW |
343 | /** |
344 | * batadv_orig_ifinfo_get - find the ifinfo from an orig_node | |
345 | * @orig_node: the orig node to be queried | |
346 | * @if_outgoing: the interface for which the ifinfo should be acquired | |
347 | * | |
348 | * Returns the requested orig_ifinfo or NULL if not found. | |
349 | * | |
350 | * The object is returned with refcounter increased by 1. | |
351 | */ | |
352 | struct batadv_orig_ifinfo * | |
353 | batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, | |
354 | struct batadv_hard_iface *if_outgoing) | |
355 | { | |
356 | struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL; | |
357 | ||
358 | rcu_read_lock(); | |
359 | hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list, | |
360 | list) { | |
361 | if (tmp->if_outgoing != if_outgoing) | |
362 | continue; | |
363 | ||
364 | if (!atomic_inc_not_zero(&tmp->refcount)) | |
365 | continue; | |
366 | ||
367 | orig_ifinfo = tmp; | |
368 | break; | |
369 | } | |
370 | rcu_read_unlock(); | |
371 | ||
372 | return orig_ifinfo; | |
373 | } | |
374 | ||
375 | /** | |
376 | * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object | |
377 | * @orig_node: the orig node to be queried | |
378 | * @if_outgoing: the interface for which the ifinfo should be acquired | |
379 | * | |
380 | * Returns NULL in case of failure or the orig_ifinfo object for the if_outgoing | |
381 | * interface otherwise. The object is created and added to the list | |
382 | * if it does not exist. | |
383 | * | |
384 | * The object is returned with refcounter increased by 1. | |
385 | */ | |
386 | struct batadv_orig_ifinfo * | |
387 | batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, | |
388 | struct batadv_hard_iface *if_outgoing) | |
389 | { | |
390 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
391 | unsigned long reset_time; | |
392 | ||
393 | spin_lock_bh(&orig_node->neigh_list_lock); | |
394 | ||
395 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing); | |
396 | if (orig_ifinfo) | |
397 | goto out; | |
398 | ||
399 | orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC); | |
400 | if (!orig_ifinfo) | |
401 | goto out; | |
402 | ||
403 | if (if_outgoing != BATADV_IF_DEFAULT && | |
404 | !atomic_inc_not_zero(&if_outgoing->refcount)) { | |
405 | kfree(orig_ifinfo); | |
406 | orig_ifinfo = NULL; | |
407 | goto out; | |
408 | } | |
409 | ||
410 | reset_time = jiffies - 1; | |
411 | reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); | |
412 | orig_ifinfo->batman_seqno_reset = reset_time; | |
413 | orig_ifinfo->if_outgoing = if_outgoing; | |
414 | INIT_HLIST_NODE(&orig_ifinfo->list); | |
415 | atomic_set(&orig_ifinfo->refcount, 2); | |
416 | hlist_add_head_rcu(&orig_ifinfo->list, | |
417 | &orig_node->ifinfo_list); | |
418 | out: | |
419 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
420 | return orig_ifinfo; | |
421 | } | |
422 | ||
89652331 SW |
423 | /** |
424 | * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node | |
425 | * @neigh_node: the neigh node to be queried | |
426 | * @if_outgoing: the interface for which the ifinfo should be acquired | |
427 | * | |
428 | * The object is returned with refcounter increased by 1. | |
429 | * | |
430 | * Returns the requested neigh_ifinfo or NULL if not found | |
431 | */ | |
432 | struct batadv_neigh_ifinfo * | |
433 | batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, | |
434 | struct batadv_hard_iface *if_outgoing) | |
435 | { | |
436 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL, | |
437 | *tmp_neigh_ifinfo; | |
438 | ||
439 | rcu_read_lock(); | |
440 | hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list, | |
441 | list) { | |
442 | if (tmp_neigh_ifinfo->if_outgoing != if_outgoing) | |
443 | continue; | |
444 | ||
445 | if (!atomic_inc_not_zero(&tmp_neigh_ifinfo->refcount)) | |
446 | continue; | |
447 | ||
448 | neigh_ifinfo = tmp_neigh_ifinfo; | |
449 | break; | |
450 | } | |
451 | rcu_read_unlock(); | |
452 | ||
453 | return neigh_ifinfo; | |
454 | } | |
455 | ||
456 | /** | |
457 | * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object | |
458 | * @neigh_node: the neigh node to be queried | |
459 | * @if_outgoing: the interface for which the ifinfo should be acquired | |
460 | * | |
461 | * Returns NULL in case of failure or the neigh_ifinfo object for the | |
462 | * if_outgoing interface otherwise. The object is created and added to the list | |
463 | * if it does not exist. | |
464 | * | |
465 | * The object is returned with refcounter increased by 1. | |
466 | */ | |
467 | struct batadv_neigh_ifinfo * | |
468 | batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, | |
469 | struct batadv_hard_iface *if_outgoing) | |
470 | { | |
471 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
472 | ||
473 | spin_lock_bh(&neigh->ifinfo_lock); | |
474 | ||
475 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing); | |
476 | if (neigh_ifinfo) | |
477 | goto out; | |
478 | ||
479 | neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC); | |
480 | if (!neigh_ifinfo) | |
481 | goto out; | |
482 | ||
483 | if (if_outgoing && !atomic_inc_not_zero(&if_outgoing->refcount)) { | |
484 | kfree(neigh_ifinfo); | |
485 | neigh_ifinfo = NULL; | |
486 | goto out; | |
487 | } | |
488 | ||
489 | INIT_HLIST_NODE(&neigh_ifinfo->list); | |
490 | atomic_set(&neigh_ifinfo->refcount, 2); | |
491 | neigh_ifinfo->if_outgoing = if_outgoing; | |
492 | ||
493 | hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list); | |
494 | ||
495 | out: | |
496 | spin_unlock_bh(&neigh->ifinfo_lock); | |
497 | ||
498 | return neigh_ifinfo; | |
499 | } | |
500 | ||
ed292663 ML |
501 | /** |
502 | * batadv_neigh_node_get - retrieve a neighbour from the list | |
503 | * @orig_node: originator which the neighbour belongs to | |
504 | * @hard_iface: the interface where this neighbour is connected to | |
505 | * @addr: the address of the neighbour | |
506 | * | |
507 | * Looks for and possibly returns a neighbour belonging to this originator list | |
508 | * which is connected through the provided hard interface. | |
509 | * Returns NULL if the neighbour is not found. | |
510 | */ | |
511 | static struct batadv_neigh_node * | |
512 | batadv_neigh_node_get(const struct batadv_orig_node *orig_node, | |
513 | const struct batadv_hard_iface *hard_iface, | |
514 | const u8 *addr) | |
515 | { | |
516 | struct batadv_neigh_node *tmp_neigh_node, *res = NULL; | |
517 | ||
518 | rcu_read_lock(); | |
519 | hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) { | |
520 | if (!batadv_compare_eth(tmp_neigh_node->addr, addr)) | |
521 | continue; | |
522 | ||
523 | if (tmp_neigh_node->if_incoming != hard_iface) | |
524 | continue; | |
525 | ||
526 | if (!atomic_inc_not_zero(&tmp_neigh_node->refcount)) | |
527 | continue; | |
528 | ||
529 | res = tmp_neigh_node; | |
530 | break; | |
531 | } | |
532 | rcu_read_unlock(); | |
533 | ||
534 | return res; | |
535 | } | |
536 | ||
cef63419 ML |
537 | /** |
538 | * batadv_hardif_neigh_create - create a hardif neighbour node | |
539 | * @hard_iface: the interface this neighbour is connected to | |
540 | * @neigh_addr: the interface address of the neighbour to retrieve | |
541 | * | |
542 | * Returns the hardif neighbour node if found or created or NULL otherwise. | |
543 | */ | |
544 | static struct batadv_hardif_neigh_node * | |
545 | batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, | |
546 | const u8 *neigh_addr) | |
547 | { | |
8248a4c7 | 548 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
cef63419 ML |
549 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
550 | ||
551 | spin_lock_bh(&hard_iface->neigh_list_lock); | |
552 | ||
553 | /* check if neighbor hasn't been added in the meantime */ | |
554 | hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); | |
555 | if (hardif_neigh) | |
556 | goto out; | |
557 | ||
558 | if (!atomic_inc_not_zero(&hard_iface->refcount)) | |
559 | goto out; | |
560 | ||
561 | hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC); | |
562 | if (!hardif_neigh) { | |
563 | batadv_hardif_free_ref(hard_iface); | |
564 | goto out; | |
565 | } | |
566 | ||
567 | INIT_HLIST_NODE(&hardif_neigh->list); | |
568 | ether_addr_copy(hardif_neigh->addr, neigh_addr); | |
569 | hardif_neigh->if_incoming = hard_iface; | |
570 | hardif_neigh->last_seen = jiffies; | |
571 | ||
572 | atomic_set(&hardif_neigh->refcount, 1); | |
573 | ||
8248a4c7 ML |
574 | if (bat_priv->bat_algo_ops->bat_hardif_neigh_init) |
575 | bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh); | |
576 | ||
cef63419 ML |
577 | hlist_add_head(&hardif_neigh->list, &hard_iface->neigh_list); |
578 | ||
579 | out: | |
580 | spin_unlock_bh(&hard_iface->neigh_list_lock); | |
581 | return hardif_neigh; | |
582 | } | |
583 | ||
584 | /** | |
585 | * batadv_hardif_neigh_get_or_create - retrieve or create a hardif neighbour | |
586 | * node | |
587 | * @hard_iface: the interface this neighbour is connected to | |
588 | * @neigh_addr: the interface address of the neighbour to retrieve | |
589 | * | |
590 | * Returns the hardif neighbour node if found or created or NULL otherwise. | |
591 | */ | |
592 | static struct batadv_hardif_neigh_node * | |
593 | batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, | |
594 | const u8 *neigh_addr) | |
595 | { | |
596 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
597 | ||
598 | /* first check without locking to avoid the overhead */ | |
599 | hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); | |
600 | if (hardif_neigh) | |
601 | return hardif_neigh; | |
602 | ||
603 | return batadv_hardif_neigh_create(hard_iface, neigh_addr); | |
604 | } | |
605 | ||
606 | /** | |
607 | * batadv_hardif_neigh_get - retrieve a hardif neighbour from the list | |
608 | * @hard_iface: the interface where this neighbour is connected to | |
609 | * @neigh_addr: the address of the neighbour | |
610 | * | |
611 | * Looks for and possibly returns a neighbour belonging to this hard interface. | |
612 | * Returns NULL if the neighbour is not found. | |
613 | */ | |
614 | struct batadv_hardif_neigh_node * | |
615 | batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, | |
616 | const u8 *neigh_addr) | |
617 | { | |
618 | struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL; | |
619 | ||
620 | rcu_read_lock(); | |
621 | hlist_for_each_entry_rcu(tmp_hardif_neigh, | |
622 | &hard_iface->neigh_list, list) { | |
623 | if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr)) | |
624 | continue; | |
625 | ||
626 | if (!atomic_inc_not_zero(&tmp_hardif_neigh->refcount)) | |
627 | continue; | |
628 | ||
629 | hardif_neigh = tmp_hardif_neigh; | |
630 | break; | |
631 | } | |
632 | rcu_read_unlock(); | |
633 | ||
634 | return hardif_neigh; | |
635 | } | |
636 | ||
0538f759 AQ |
637 | /** |
638 | * batadv_neigh_node_new - create and init a new neigh_node object | |
3f32f8a6 | 639 | * @orig_node: originator object representing the neighbour |
0538f759 AQ |
640 | * @hard_iface: the interface where the neighbour is connected to |
641 | * @neigh_addr: the mac address of the neighbour interface | |
0538f759 AQ |
642 | * |
643 | * Allocates a new neigh_node object and initialises all the generic fields. | |
644 | * Returns the new object or NULL on failure. | |
645 | */ | |
56303d34 | 646 | struct batadv_neigh_node * |
3f32f8a6 ML |
647 | batadv_neigh_node_new(struct batadv_orig_node *orig_node, |
648 | struct batadv_hard_iface *hard_iface, | |
649 | const u8 *neigh_addr) | |
c6c8fea2 | 650 | { |
56303d34 | 651 | struct batadv_neigh_node *neigh_node; |
cef63419 | 652 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
c6c8fea2 | 653 | |
741aa06b ML |
654 | neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr); |
655 | if (neigh_node) | |
656 | goto out; | |
657 | ||
cef63419 ML |
658 | hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface, |
659 | neigh_addr); | |
660 | if (!hardif_neigh) | |
661 | goto out; | |
662 | ||
704509b8 | 663 | neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC); |
c6c8fea2 | 664 | if (!neigh_node) |
7ae8b285 | 665 | goto out; |
c6c8fea2 | 666 | |
f729dc70 ML |
667 | if (!atomic_inc_not_zero(&hard_iface->refcount)) { |
668 | kfree(neigh_node); | |
669 | neigh_node = NULL; | |
670 | goto out; | |
671 | } | |
672 | ||
9591a79f | 673 | INIT_HLIST_NODE(&neigh_node->list); |
89652331 SW |
674 | INIT_HLIST_HEAD(&neigh_node->ifinfo_list); |
675 | spin_lock_init(&neigh_node->ifinfo_lock); | |
c6c8fea2 | 676 | |
8fdd0153 | 677 | ether_addr_copy(neigh_node->addr, neigh_addr); |
0538f759 AQ |
678 | neigh_node->if_incoming = hard_iface; |
679 | neigh_node->orig_node = orig_node; | |
680 | ||
1605d0d6 ML |
681 | /* extra reference for return */ |
682 | atomic_set(&neigh_node->refcount, 2); | |
c6c8fea2 | 683 | |
741aa06b ML |
684 | spin_lock_bh(&orig_node->neigh_list_lock); |
685 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
686 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
687 | ||
cef63419 ML |
688 | /* increment unique neighbor refcount */ |
689 | atomic_inc(&hardif_neigh->refcount); | |
690 | ||
741aa06b ML |
691 | batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv, |
692 | "Creating new neighbor %pM for orig_node %pM on interface %s\n", | |
693 | neigh_addr, orig_node->orig, hard_iface->net_dev->name); | |
694 | ||
7ae8b285 | 695 | out: |
cef63419 ML |
696 | if (hardif_neigh) |
697 | batadv_hardif_neigh_free_ref(hardif_neigh); | |
c6c8fea2 SE |
698 | return neigh_node; |
699 | } | |
700 | ||
7587405a ML |
701 | /** |
702 | * batadv_hardif_neigh_seq_print_text - print the single hop neighbour list | |
703 | * @seq: neighbour table seq_file struct | |
704 | * @offset: not used | |
705 | * | |
706 | * Always returns 0. | |
707 | */ | |
708 | int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset) | |
709 | { | |
710 | struct net_device *net_dev = (struct net_device *)seq->private; | |
711 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
712 | struct batadv_hard_iface *primary_if; | |
713 | ||
714 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
715 | if (!primary_if) | |
716 | return 0; | |
717 | ||
718 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n", | |
719 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
720 | primary_if->net_dev->dev_addr, net_dev->name, | |
721 | bat_priv->bat_algo_ops->name); | |
722 | ||
723 | batadv_hardif_free_ref(primary_if); | |
724 | ||
725 | if (!bat_priv->bat_algo_ops->bat_neigh_print) { | |
726 | seq_puts(seq, | |
727 | "No printing function for this routing protocol\n"); | |
728 | return 0; | |
729 | } | |
730 | ||
731 | bat_priv->bat_algo_ops->bat_neigh_print(bat_priv, seq); | |
732 | return 0; | |
733 | } | |
734 | ||
7351a482 SW |
735 | /** |
736 | * batadv_orig_ifinfo_free_rcu - free the orig_ifinfo object | |
737 | * @rcu: rcu pointer of the orig_ifinfo object | |
738 | */ | |
739 | static void batadv_orig_ifinfo_free_rcu(struct rcu_head *rcu) | |
740 | { | |
741 | struct batadv_orig_ifinfo *orig_ifinfo; | |
000c8dff | 742 | struct batadv_neigh_node *router; |
7351a482 SW |
743 | |
744 | orig_ifinfo = container_of(rcu, struct batadv_orig_ifinfo, rcu); | |
745 | ||
746 | if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT) | |
747 | batadv_hardif_free_ref_now(orig_ifinfo->if_outgoing); | |
748 | ||
000c8dff SW |
749 | /* this is the last reference to this object */ |
750 | router = rcu_dereference_protected(orig_ifinfo->router, true); | |
751 | if (router) | |
752 | batadv_neigh_node_free_ref_now(router); | |
7351a482 SW |
753 | kfree(orig_ifinfo); |
754 | } | |
755 | ||
756 | /** | |
757 | * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free | |
758 | * the orig_ifinfo (without rcu callback) | |
759 | * @orig_ifinfo: the orig_ifinfo object to release | |
760 | */ | |
761 | static void | |
762 | batadv_orig_ifinfo_free_ref_now(struct batadv_orig_ifinfo *orig_ifinfo) | |
763 | { | |
764 | if (atomic_dec_and_test(&orig_ifinfo->refcount)) | |
765 | batadv_orig_ifinfo_free_rcu(&orig_ifinfo->rcu); | |
766 | } | |
767 | ||
768 | /** | |
769 | * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly free | |
770 | * the orig_ifinfo | |
771 | * @orig_ifinfo: the orig_ifinfo object to release | |
772 | */ | |
773 | void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo) | |
774 | { | |
775 | if (atomic_dec_and_test(&orig_ifinfo->refcount)) | |
776 | call_rcu(&orig_ifinfo->rcu, batadv_orig_ifinfo_free_rcu); | |
777 | } | |
778 | ||
03fc7f86 | 779 | static void batadv_orig_node_free_rcu(struct rcu_head *rcu) |
c6c8fea2 | 780 | { |
b67bfe0d | 781 | struct hlist_node *node_tmp; |
f6c8b711 | 782 | struct batadv_neigh_node *neigh_node; |
56303d34 | 783 | struct batadv_orig_node *orig_node; |
7351a482 | 784 | struct batadv_orig_ifinfo *orig_ifinfo; |
16b1aba8 | 785 | |
56303d34 | 786 | orig_node = container_of(rcu, struct batadv_orig_node, rcu); |
c6c8fea2 | 787 | |
f987ed6e ML |
788 | spin_lock_bh(&orig_node->neigh_list_lock); |
789 | ||
c6c8fea2 | 790 | /* for all neighbors towards this originator ... */ |
b67bfe0d | 791 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
9591a79f | 792 | &orig_node->neigh_list, list) { |
f987ed6e | 793 | hlist_del_rcu(&neigh_node->list); |
89652331 | 794 | batadv_neigh_node_free_ref_now(neigh_node); |
c6c8fea2 SE |
795 | } |
796 | ||
7351a482 SW |
797 | hlist_for_each_entry_safe(orig_ifinfo, node_tmp, |
798 | &orig_node->ifinfo_list, list) { | |
799 | hlist_del_rcu(&orig_ifinfo->list); | |
800 | batadv_orig_ifinfo_free_ref_now(orig_ifinfo); | |
801 | } | |
f987ed6e ML |
802 | spin_unlock_bh(&orig_node->neigh_list_lock); |
803 | ||
60432d75 LL |
804 | batadv_mcast_purge_orig(orig_node); |
805 | ||
d56b1705 MH |
806 | /* Free nc_nodes */ |
807 | batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL); | |
808 | ||
610bfc6b MH |
809 | batadv_frag_purge_orig(orig_node, NULL); |
810 | ||
d0015fdd AQ |
811 | if (orig_node->bat_priv->bat_algo_ops->bat_orig_free) |
812 | orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node); | |
813 | ||
a73105b8 | 814 | kfree(orig_node->tt_buff); |
c6c8fea2 SE |
815 | kfree(orig_node); |
816 | } | |
817 | ||
72822225 LL |
818 | /** |
819 | * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly | |
820 | * schedule an rcu callback for freeing it | |
821 | * @orig_node: the orig node to free | |
822 | */ | |
56303d34 | 823 | void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node) |
7b36e8ee ML |
824 | { |
825 | if (atomic_dec_and_test(&orig_node->refcount)) | |
03fc7f86 | 826 | call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu); |
7b36e8ee ML |
827 | } |
828 | ||
72822225 LL |
829 | /** |
830 | * batadv_orig_node_free_ref_now - decrement the orig node refcounter and | |
831 | * possibly free it (without rcu callback) | |
832 | * @orig_node: the orig node to free | |
833 | */ | |
834 | void batadv_orig_node_free_ref_now(struct batadv_orig_node *orig_node) | |
835 | { | |
836 | if (atomic_dec_and_test(&orig_node->refcount)) | |
837 | batadv_orig_node_free_rcu(&orig_node->rcu); | |
838 | } | |
839 | ||
56303d34 | 840 | void batadv_originator_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 841 | { |
5bf74e9c | 842 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
b67bfe0d | 843 | struct hlist_node *node_tmp; |
16b1aba8 | 844 | struct hlist_head *head; |
16b1aba8 | 845 | spinlock_t *list_lock; /* spinlock to protect write access */ |
56303d34 | 846 | struct batadv_orig_node *orig_node; |
6b5e971a | 847 | u32 i; |
16b1aba8 ML |
848 | |
849 | if (!hash) | |
c6c8fea2 SE |
850 | return; |
851 | ||
852 | cancel_delayed_work_sync(&bat_priv->orig_work); | |
853 | ||
c6c8fea2 | 854 | bat_priv->orig_hash = NULL; |
16b1aba8 ML |
855 | |
856 | for (i = 0; i < hash->size; i++) { | |
857 | head = &hash->table[i]; | |
858 | list_lock = &hash->list_locks[i]; | |
859 | ||
860 | spin_lock_bh(list_lock); | |
b67bfe0d | 861 | hlist_for_each_entry_safe(orig_node, node_tmp, |
7aadf889 | 862 | head, hash_entry) { |
b67bfe0d | 863 | hlist_del_rcu(&orig_node->hash_entry); |
7d211efc | 864 | batadv_orig_node_free_ref(orig_node); |
16b1aba8 ML |
865 | } |
866 | spin_unlock_bh(list_lock); | |
867 | } | |
868 | ||
1a8eaf07 | 869 | batadv_hash_destroy(hash); |
c6c8fea2 SE |
870 | } |
871 | ||
bbad0a5e AQ |
872 | /** |
873 | * batadv_orig_node_new - creates a new orig_node | |
874 | * @bat_priv: the bat priv with all the soft interface information | |
875 | * @addr: the mac address of the originator | |
876 | * | |
877 | * Creates a new originator object and initialise all the generic fields. | |
878 | * The new object is not added to the originator list. | |
879 | * Returns the newly created object or NULL on failure. | |
9cfc7bd6 | 880 | */ |
bbad0a5e | 881 | struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, |
6b5e971a | 882 | const u8 *addr) |
c6c8fea2 | 883 | { |
56303d34 | 884 | struct batadv_orig_node *orig_node; |
7ea7b4a1 | 885 | struct batadv_orig_node_vlan *vlan; |
42d0b044 | 886 | unsigned long reset_time; |
bbad0a5e | 887 | int i; |
c6c8fea2 | 888 | |
39c75a51 SE |
889 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
890 | "Creating new originator: %pM\n", addr); | |
c6c8fea2 | 891 | |
704509b8 | 892 | orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC); |
c6c8fea2 SE |
893 | if (!orig_node) |
894 | return NULL; | |
895 | ||
9591a79f | 896 | INIT_HLIST_HEAD(&orig_node->neigh_list); |
d0fa4f3f | 897 | INIT_HLIST_HEAD(&orig_node->vlan_list); |
7351a482 | 898 | INIT_HLIST_HEAD(&orig_node->ifinfo_list); |
f3e0008f | 899 | spin_lock_init(&orig_node->bcast_seqno_lock); |
f987ed6e | 900 | spin_lock_init(&orig_node->neigh_list_lock); |
a73105b8 | 901 | spin_lock_init(&orig_node->tt_buff_lock); |
a70a9aa9 | 902 | spin_lock_init(&orig_node->tt_lock); |
7ea7b4a1 | 903 | spin_lock_init(&orig_node->vlan_list_lock); |
7b36e8ee | 904 | |
d56b1705 MH |
905 | batadv_nc_init_orig(orig_node); |
906 | ||
7b36e8ee ML |
907 | /* extra reference for return */ |
908 | atomic_set(&orig_node->refcount, 2); | |
c6c8fea2 | 909 | |
16b1aba8 | 910 | orig_node->bat_priv = bat_priv; |
8fdd0153 | 911 | ether_addr_copy(orig_node->orig, addr); |
785ea114 | 912 | batadv_dat_init_orig_node_addr(orig_node); |
c8c991bf | 913 | atomic_set(&orig_node->last_ttvn, 0); |
2dafb49d | 914 | orig_node->tt_buff = NULL; |
a73105b8 | 915 | orig_node->tt_buff_len = 0; |
2c667a33 | 916 | orig_node->last_seen = jiffies; |
42d0b044 SE |
917 | reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); |
918 | orig_node->bcast_seqno_reset = reset_time; | |
8a4023c5 | 919 | |
60432d75 LL |
920 | #ifdef CONFIG_BATMAN_ADV_MCAST |
921 | orig_node->mcast_flags = BATADV_NO_FLAGS; | |
8a4023c5 LL |
922 | INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node); |
923 | INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node); | |
924 | INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node); | |
925 | spin_lock_init(&orig_node->mcast_handler_lock); | |
60432d75 | 926 | #endif |
c6c8fea2 | 927 | |
7ea7b4a1 AQ |
928 | /* create a vlan object for the "untagged" LAN */ |
929 | vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS); | |
930 | if (!vlan) | |
931 | goto free_orig_node; | |
932 | /* batadv_orig_node_vlan_new() increases the refcounter. | |
933 | * Immediately release vlan since it is not needed anymore in this | |
934 | * context | |
935 | */ | |
936 | batadv_orig_node_vlan_free_ref(vlan); | |
937 | ||
610bfc6b MH |
938 | for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { |
939 | INIT_HLIST_HEAD(&orig_node->fragments[i].head); | |
940 | spin_lock_init(&orig_node->fragments[i].lock); | |
941 | orig_node->fragments[i].size = 0; | |
942 | } | |
943 | ||
c6c8fea2 | 944 | return orig_node; |
c6c8fea2 SE |
945 | free_orig_node: |
946 | kfree(orig_node); | |
947 | return NULL; | |
948 | } | |
949 | ||
709de13f SW |
950 | /** |
951 | * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor | |
952 | * @bat_priv: the bat priv with all the soft interface information | |
953 | * @neigh: orig node which is to be checked | |
954 | */ | |
955 | static void | |
956 | batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, | |
957 | struct batadv_neigh_node *neigh) | |
958 | { | |
959 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
960 | struct batadv_hard_iface *if_outgoing; | |
961 | struct hlist_node *node_tmp; | |
962 | ||
963 | spin_lock_bh(&neigh->ifinfo_lock); | |
964 | ||
965 | /* for all ifinfo objects for this neighinator */ | |
966 | hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, | |
967 | &neigh->ifinfo_list, list) { | |
968 | if_outgoing = neigh_ifinfo->if_outgoing; | |
969 | ||
970 | /* always keep the default interface */ | |
971 | if (if_outgoing == BATADV_IF_DEFAULT) | |
972 | continue; | |
973 | ||
974 | /* don't purge if the interface is not (going) down */ | |
975 | if ((if_outgoing->if_status != BATADV_IF_INACTIVE) && | |
976 | (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) && | |
977 | (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)) | |
978 | continue; | |
979 | ||
980 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
981 | "neighbor/ifinfo purge: neighbor %pM, iface: %s\n", | |
982 | neigh->addr, if_outgoing->net_dev->name); | |
983 | ||
984 | hlist_del_rcu(&neigh_ifinfo->list); | |
985 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
986 | } | |
987 | ||
988 | spin_unlock_bh(&neigh->ifinfo_lock); | |
989 | } | |
990 | ||
7351a482 SW |
991 | /** |
992 | * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator | |
993 | * @bat_priv: the bat priv with all the soft interface information | |
994 | * @orig_node: orig node which is to be checked | |
995 | * | |
996 | * Returns true if any ifinfo entry was purged, false otherwise. | |
997 | */ | |
998 | static bool | |
999 | batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, | |
1000 | struct batadv_orig_node *orig_node) | |
1001 | { | |
1002 | struct batadv_orig_ifinfo *orig_ifinfo; | |
1003 | struct batadv_hard_iface *if_outgoing; | |
1004 | struct hlist_node *node_tmp; | |
1005 | bool ifinfo_purged = false; | |
1006 | ||
1007 | spin_lock_bh(&orig_node->neigh_list_lock); | |
1008 | ||
1009 | /* for all ifinfo objects for this originator */ | |
1010 | hlist_for_each_entry_safe(orig_ifinfo, node_tmp, | |
1011 | &orig_node->ifinfo_list, list) { | |
1012 | if_outgoing = orig_ifinfo->if_outgoing; | |
1013 | ||
1014 | /* always keep the default interface */ | |
1015 | if (if_outgoing == BATADV_IF_DEFAULT) | |
1016 | continue; | |
1017 | ||
1018 | /* don't purge if the interface is not (going) down */ | |
1019 | if ((if_outgoing->if_status != BATADV_IF_INACTIVE) && | |
1020 | (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) && | |
1021 | (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)) | |
1022 | continue; | |
1023 | ||
1024 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1025 | "router/ifinfo purge: originator %pM, iface: %s\n", | |
1026 | orig_node->orig, if_outgoing->net_dev->name); | |
1027 | ||
1028 | ifinfo_purged = true; | |
1029 | ||
1030 | hlist_del_rcu(&orig_ifinfo->list); | |
1031 | batadv_orig_ifinfo_free_ref(orig_ifinfo); | |
f3b3d901 SW |
1032 | if (orig_node->last_bonding_candidate == orig_ifinfo) { |
1033 | orig_node->last_bonding_candidate = NULL; | |
1034 | batadv_orig_ifinfo_free_ref(orig_ifinfo); | |
1035 | } | |
7351a482 SW |
1036 | } |
1037 | ||
1038 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
1039 | ||
1040 | return ifinfo_purged; | |
1041 | } | |
1042 | ||
89652331 SW |
1043 | /** |
1044 | * batadv_purge_orig_neighbors - purges neighbors from originator | |
1045 | * @bat_priv: the bat priv with all the soft interface information | |
1046 | * @orig_node: orig node which is to be checked | |
1047 | * | |
1048 | * Returns true if any neighbor was purged, false otherwise | |
1049 | */ | |
56303d34 SE |
1050 | static bool |
1051 | batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, | |
89652331 | 1052 | struct batadv_orig_node *orig_node) |
c6c8fea2 | 1053 | { |
b67bfe0d | 1054 | struct hlist_node *node_tmp; |
56303d34 | 1055 | struct batadv_neigh_node *neigh_node; |
c6c8fea2 | 1056 | bool neigh_purged = false; |
0b0094e0 | 1057 | unsigned long last_seen; |
56303d34 | 1058 | struct batadv_hard_iface *if_incoming; |
c6c8fea2 | 1059 | |
f987ed6e ML |
1060 | spin_lock_bh(&orig_node->neigh_list_lock); |
1061 | ||
c6c8fea2 | 1062 | /* for all neighbors towards this originator ... */ |
b67bfe0d | 1063 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
9591a79f | 1064 | &orig_node->neigh_list, list) { |
1eda58bf SE |
1065 | last_seen = neigh_node->last_seen; |
1066 | if_incoming = neigh_node->if_incoming; | |
1067 | ||
42d0b044 | 1068 | if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) || |
e9a4f295 SE |
1069 | (if_incoming->if_status == BATADV_IF_INACTIVE) || |
1070 | (if_incoming->if_status == BATADV_IF_NOT_IN_USE) || | |
1071 | (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) { | |
e9a4f295 SE |
1072 | if ((if_incoming->if_status == BATADV_IF_INACTIVE) || |
1073 | (if_incoming->if_status == BATADV_IF_NOT_IN_USE) || | |
1074 | (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) | |
39c75a51 | 1075 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1076 | "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n", |
1077 | orig_node->orig, neigh_node->addr, | |
1078 | if_incoming->net_dev->name); | |
c6c8fea2 | 1079 | else |
39c75a51 | 1080 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1081 | "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n", |
1082 | orig_node->orig, neigh_node->addr, | |
1083 | jiffies_to_msecs(last_seen)); | |
c6c8fea2 SE |
1084 | |
1085 | neigh_purged = true; | |
9591a79f | 1086 | |
f987ed6e | 1087 | hlist_del_rcu(&neigh_node->list); |
7d211efc | 1088 | batadv_neigh_node_free_ref(neigh_node); |
709de13f SW |
1089 | } else { |
1090 | /* only necessary if not the whole neighbor is to be | |
1091 | * deleted, but some interface has been removed. | |
1092 | */ | |
1093 | batadv_purge_neigh_ifinfo(bat_priv, neigh_node); | |
c6c8fea2 SE |
1094 | } |
1095 | } | |
f987ed6e ML |
1096 | |
1097 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
c6c8fea2 SE |
1098 | return neigh_purged; |
1099 | } | |
1100 | ||
89652331 SW |
1101 | /** |
1102 | * batadv_find_best_neighbor - finds the best neighbor after purging | |
1103 | * @bat_priv: the bat priv with all the soft interface information | |
1104 | * @orig_node: orig node which is to be checked | |
1105 | * @if_outgoing: the interface for which the metric should be compared | |
1106 | * | |
1107 | * Returns the current best neighbor, with refcount increased. | |
1108 | */ | |
1109 | static struct batadv_neigh_node * | |
1110 | batadv_find_best_neighbor(struct batadv_priv *bat_priv, | |
1111 | struct batadv_orig_node *orig_node, | |
1112 | struct batadv_hard_iface *if_outgoing) | |
1113 | { | |
1114 | struct batadv_neigh_node *best = NULL, *neigh; | |
1115 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; | |
1116 | ||
1117 | rcu_read_lock(); | |
1118 | hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) { | |
1119 | if (best && (bao->bat_neigh_cmp(neigh, if_outgoing, | |
1120 | best, if_outgoing) <= 0)) | |
1121 | continue; | |
1122 | ||
1123 | if (!atomic_inc_not_zero(&neigh->refcount)) | |
1124 | continue; | |
1125 | ||
1126 | if (best) | |
1127 | batadv_neigh_node_free_ref(best); | |
1128 | ||
1129 | best = neigh; | |
1130 | } | |
1131 | rcu_read_unlock(); | |
1132 | ||
1133 | return best; | |
1134 | } | |
1135 | ||
7351a482 SW |
1136 | /** |
1137 | * batadv_purge_orig_node - purges obsolete information from an orig_node | |
1138 | * @bat_priv: the bat priv with all the soft interface information | |
1139 | * @orig_node: orig node which is to be checked | |
1140 | * | |
1141 | * This function checks if the orig_node or substructures of it have become | |
1142 | * obsolete, and purges this information if that's the case. | |
1143 | * | |
1144 | * Returns true if the orig_node is to be removed, false otherwise. | |
1145 | */ | |
56303d34 SE |
1146 | static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, |
1147 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 1148 | { |
56303d34 | 1149 | struct batadv_neigh_node *best_neigh_node; |
7351a482 | 1150 | struct batadv_hard_iface *hard_iface; |
7b955a9f | 1151 | bool changed_ifinfo, changed_neigh; |
c6c8fea2 | 1152 | |
42d0b044 SE |
1153 | if (batadv_has_timed_out(orig_node->last_seen, |
1154 | 2 * BATADV_PURGE_TIMEOUT)) { | |
39c75a51 | 1155 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1156 | "Originator timeout: originator %pM, last_seen %u\n", |
1157 | orig_node->orig, | |
1158 | jiffies_to_msecs(orig_node->last_seen)); | |
c6c8fea2 | 1159 | return true; |
c6c8fea2 | 1160 | } |
7b955a9f SW |
1161 | changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node); |
1162 | changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node); | |
7351a482 | 1163 | |
7b955a9f | 1164 | if (!changed_ifinfo && !changed_neigh) |
89652331 SW |
1165 | return false; |
1166 | ||
7351a482 | 1167 | /* first for NULL ... */ |
89652331 SW |
1168 | best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node, |
1169 | BATADV_IF_DEFAULT); | |
7351a482 SW |
1170 | batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT, |
1171 | best_neigh_node); | |
89652331 SW |
1172 | if (best_neigh_node) |
1173 | batadv_neigh_node_free_ref(best_neigh_node); | |
c6c8fea2 | 1174 | |
7351a482 SW |
1175 | /* ... then for all other interfaces. */ |
1176 | rcu_read_lock(); | |
1177 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1178 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1179 | continue; | |
1180 | ||
1181 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
1182 | continue; | |
1183 | ||
1184 | best_neigh_node = batadv_find_best_neighbor(bat_priv, | |
1185 | orig_node, | |
1186 | hard_iface); | |
1187 | batadv_update_route(bat_priv, orig_node, hard_iface, | |
1188 | best_neigh_node); | |
1189 | if (best_neigh_node) | |
1190 | batadv_neigh_node_free_ref(best_neigh_node); | |
1191 | } | |
1192 | rcu_read_unlock(); | |
1193 | ||
c6c8fea2 SE |
1194 | return false; |
1195 | } | |
1196 | ||
56303d34 | 1197 | static void _batadv_purge_orig(struct batadv_priv *bat_priv) |
c6c8fea2 | 1198 | { |
5bf74e9c | 1199 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
b67bfe0d | 1200 | struct hlist_node *node_tmp; |
c6c8fea2 | 1201 | struct hlist_head *head; |
fb778ea1 | 1202 | spinlock_t *list_lock; /* spinlock to protect write access */ |
56303d34 | 1203 | struct batadv_orig_node *orig_node; |
6b5e971a | 1204 | u32 i; |
c6c8fea2 SE |
1205 | |
1206 | if (!hash) | |
1207 | return; | |
1208 | ||
c6c8fea2 SE |
1209 | /* for all origins... */ |
1210 | for (i = 0; i < hash->size; i++) { | |
1211 | head = &hash->table[i]; | |
fb778ea1 | 1212 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1213 | |
fb778ea1 | 1214 | spin_lock_bh(list_lock); |
b67bfe0d | 1215 | hlist_for_each_entry_safe(orig_node, node_tmp, |
7aadf889 | 1216 | head, hash_entry) { |
03fc7f86 | 1217 | if (batadv_purge_orig_node(bat_priv, orig_node)) { |
414254e3 | 1218 | batadv_gw_node_delete(bat_priv, orig_node); |
b67bfe0d | 1219 | hlist_del_rcu(&orig_node->hash_entry); |
9d31b3ce LL |
1220 | batadv_tt_global_del_orig(orig_node->bat_priv, |
1221 | orig_node, -1, | |
1222 | "originator timed out"); | |
7d211efc | 1223 | batadv_orig_node_free_ref(orig_node); |
fb778ea1 | 1224 | continue; |
c6c8fea2 | 1225 | } |
610bfc6b MH |
1226 | |
1227 | batadv_frag_purge_orig(orig_node, | |
1228 | batadv_frag_check_entry); | |
c6c8fea2 | 1229 | } |
fb778ea1 | 1230 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
1231 | } |
1232 | ||
7cf06bc6 | 1233 | batadv_gw_election(bat_priv); |
c6c8fea2 SE |
1234 | } |
1235 | ||
03fc7f86 | 1236 | static void batadv_purge_orig(struct work_struct *work) |
c6c8fea2 | 1237 | { |
56303d34 SE |
1238 | struct delayed_work *delayed_work; |
1239 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 1240 | |
56303d34 SE |
1241 | delayed_work = container_of(work, struct delayed_work, work); |
1242 | bat_priv = container_of(delayed_work, struct batadv_priv, orig_work); | |
03fc7f86 | 1243 | _batadv_purge_orig(bat_priv); |
72414442 AQ |
1244 | queue_delayed_work(batadv_event_workqueue, |
1245 | &bat_priv->orig_work, | |
1246 | msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); | |
c6c8fea2 SE |
1247 | } |
1248 | ||
56303d34 | 1249 | void batadv_purge_orig_ref(struct batadv_priv *bat_priv) |
c6c8fea2 | 1250 | { |
03fc7f86 | 1251 | _batadv_purge_orig(bat_priv); |
c6c8fea2 SE |
1252 | } |
1253 | ||
7d211efc | 1254 | int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
1255 | { |
1256 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1257 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
56303d34 | 1258 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 1259 | |
30da63a6 ML |
1260 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1261 | if (!primary_if) | |
737a2a22 | 1262 | return 0; |
c6c8fea2 | 1263 | |
737a2a22 | 1264 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n", |
42d0b044 | 1265 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
737a2a22 AQ |
1266 | primary_if->net_dev->dev_addr, net_dev->name, |
1267 | bat_priv->bat_algo_ops->name); | |
c6c8fea2 | 1268 | |
737a2a22 | 1269 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 | 1270 | |
737a2a22 AQ |
1271 | if (!bat_priv->bat_algo_ops->bat_orig_print) { |
1272 | seq_puts(seq, | |
1273 | "No printing function for this routing protocol\n"); | |
1274 | return 0; | |
c6c8fea2 SE |
1275 | } |
1276 | ||
cb1c92ec SW |
1277 | bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, |
1278 | BATADV_IF_DEFAULT); | |
c6c8fea2 | 1279 | |
30da63a6 | 1280 | return 0; |
c6c8fea2 SE |
1281 | } |
1282 | ||
cb1c92ec SW |
1283 | /** |
1284 | * batadv_orig_hardif_seq_print_text - writes originator infos for a specific | |
1285 | * outgoing interface | |
1286 | * @seq: debugfs table seq_file struct | |
1287 | * @offset: not used | |
1288 | * | |
1289 | * Returns 0 | |
1290 | */ | |
1291 | int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset) | |
1292 | { | |
1293 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1294 | struct batadv_hard_iface *hard_iface; | |
1295 | struct batadv_priv *bat_priv; | |
1296 | ||
1297 | hard_iface = batadv_hardif_get_by_netdev(net_dev); | |
1298 | ||
1299 | if (!hard_iface || !hard_iface->soft_iface) { | |
1300 | seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n"); | |
1301 | goto out; | |
1302 | } | |
1303 | ||
1304 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
1305 | if (!bat_priv->bat_algo_ops->bat_orig_print) { | |
1306 | seq_puts(seq, | |
1307 | "No printing function for this routing protocol\n"); | |
1308 | goto out; | |
1309 | } | |
1310 | ||
1311 | if (hard_iface->if_status != BATADV_IF_ACTIVE) { | |
1312 | seq_puts(seq, "Interface not active\n"); | |
1313 | goto out; | |
1314 | } | |
1315 | ||
1316 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n", | |
1317 | BATADV_SOURCE_VERSION, hard_iface->net_dev->name, | |
1318 | hard_iface->net_dev->dev_addr, | |
1319 | hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name); | |
1320 | ||
1321 | bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface); | |
1322 | ||
1323 | out: | |
16a41423 ML |
1324 | if (hard_iface) |
1325 | batadv_hardif_free_ref(hard_iface); | |
cb1c92ec SW |
1326 | return 0; |
1327 | } | |
1328 | ||
56303d34 SE |
1329 | int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, |
1330 | int max_if_num) | |
c6c8fea2 | 1331 | { |
56303d34 | 1332 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
d0015fdd | 1333 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
5bf74e9c | 1334 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
c6c8fea2 | 1335 | struct hlist_head *head; |
56303d34 | 1336 | struct batadv_orig_node *orig_node; |
6b5e971a | 1337 | u32 i; |
c90681b8 | 1338 | int ret; |
c6c8fea2 SE |
1339 | |
1340 | /* resize all orig nodes because orig_node->bcast_own(_sum) depend on | |
9cfc7bd6 SE |
1341 | * if_num |
1342 | */ | |
c6c8fea2 SE |
1343 | for (i = 0; i < hash->size; i++) { |
1344 | head = &hash->table[i]; | |
1345 | ||
fb778ea1 | 1346 | rcu_read_lock(); |
b67bfe0d | 1347 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
d0015fdd AQ |
1348 | ret = 0; |
1349 | if (bao->bat_orig_add_if) | |
1350 | ret = bao->bat_orig_add_if(orig_node, | |
1351 | max_if_num); | |
5346c35e | 1352 | if (ret == -ENOMEM) |
c6c8fea2 SE |
1353 | goto err; |
1354 | } | |
fb778ea1 | 1355 | rcu_read_unlock(); |
c6c8fea2 SE |
1356 | } |
1357 | ||
c6c8fea2 SE |
1358 | return 0; |
1359 | ||
1360 | err: | |
fb778ea1 | 1361 | rcu_read_unlock(); |
c6c8fea2 SE |
1362 | return -ENOMEM; |
1363 | } | |
1364 | ||
56303d34 SE |
1365 | int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, |
1366 | int max_if_num) | |
c6c8fea2 | 1367 | { |
56303d34 | 1368 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
5bf74e9c | 1369 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
c6c8fea2 | 1370 | struct hlist_head *head; |
56303d34 SE |
1371 | struct batadv_hard_iface *hard_iface_tmp; |
1372 | struct batadv_orig_node *orig_node; | |
d0015fdd | 1373 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
6b5e971a | 1374 | u32 i; |
c90681b8 | 1375 | int ret; |
c6c8fea2 SE |
1376 | |
1377 | /* resize all orig nodes because orig_node->bcast_own(_sum) depend on | |
9cfc7bd6 SE |
1378 | * if_num |
1379 | */ | |
c6c8fea2 SE |
1380 | for (i = 0; i < hash->size; i++) { |
1381 | head = &hash->table[i]; | |
1382 | ||
fb778ea1 | 1383 | rcu_read_lock(); |
b67bfe0d | 1384 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
d0015fdd AQ |
1385 | ret = 0; |
1386 | if (bao->bat_orig_del_if) | |
1387 | ret = bao->bat_orig_del_if(orig_node, | |
1388 | max_if_num, | |
1389 | hard_iface->if_num); | |
5346c35e | 1390 | if (ret == -ENOMEM) |
c6c8fea2 SE |
1391 | goto err; |
1392 | } | |
fb778ea1 | 1393 | rcu_read_unlock(); |
c6c8fea2 SE |
1394 | } |
1395 | ||
1396 | /* renumber remaining batman interfaces _inside_ of orig_hash_lock */ | |
1397 | rcu_read_lock(); | |
3193e8fd | 1398 | list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) { |
e9a4f295 | 1399 | if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
1400 | continue; |
1401 | ||
e6c10f43 | 1402 | if (hard_iface == hard_iface_tmp) |
c6c8fea2 SE |
1403 | continue; |
1404 | ||
e6c10f43 | 1405 | if (hard_iface->soft_iface != hard_iface_tmp->soft_iface) |
c6c8fea2 SE |
1406 | continue; |
1407 | ||
e6c10f43 ML |
1408 | if (hard_iface_tmp->if_num > hard_iface->if_num) |
1409 | hard_iface_tmp->if_num--; | |
c6c8fea2 SE |
1410 | } |
1411 | rcu_read_unlock(); | |
1412 | ||
e6c10f43 | 1413 | hard_iface->if_num = -1; |
c6c8fea2 SE |
1414 | return 0; |
1415 | ||
1416 | err: | |
fb778ea1 | 1417 | rcu_read_unlock(); |
c6c8fea2 SE |
1418 | return -ENOMEM; |
1419 | } |