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0046b040 | 1 | /* Copyright (C) 2009-2016 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> | |
90f564df | 26 | #include <linux/kref.h> |
1e2c2a4f SE |
27 | #include <linux/list.h> |
28 | #include <linux/lockdep.h> | |
29 | #include <linux/netdevice.h> | |
d0fa4f3f | 30 | #include <linux/rculist.h> |
1e2c2a4f SE |
31 | #include <linux/seq_file.h> |
32 | #include <linux/slab.h> | |
33 | #include <linux/spinlock.h> | |
34 | #include <linux/workqueue.h> | |
35 | ||
785ea114 | 36 | #include "distributed-arp-table.h" |
1e2c2a4f | 37 | #include "fragmentation.h" |
c6c8fea2 SE |
38 | #include "gateway_client.h" |
39 | #include "hard-interface.h" | |
1e2c2a4f | 40 | #include "hash.h" |
60432d75 | 41 | #include "multicast.h" |
1e2c2a4f SE |
42 | #include "network-coding.h" |
43 | #include "routing.h" | |
44 | #include "translation-table.h" | |
c6c8fea2 | 45 | |
dec05074 AQ |
46 | /* hash class keys */ |
47 | static struct lock_class_key batadv_orig_hash_lock_class_key; | |
48 | ||
03fc7f86 | 49 | static void batadv_purge_orig(struct work_struct *work); |
c6c8fea2 | 50 | |
62fe710f | 51 | /** |
7afcbbef SE |
52 | * batadv_compare_orig - comparing function used in the originator hash table |
53 | * @node: node in the local table | |
54 | * @data2: second object to compare the node to | |
62fe710f SE |
55 | * |
56 | * Return: 1 if they are the same originator | |
57 | */ | |
bbad0a5e | 58 | int batadv_compare_orig(const struct hlist_node *node, const void *data2) |
b8e2dd13 | 59 | { |
56303d34 SE |
60 | const void *data1 = container_of(node, struct batadv_orig_node, |
61 | hash_entry); | |
b8e2dd13 | 62 | |
323813ed | 63 | return batadv_compare_eth(data1, data2); |
b8e2dd13 SE |
64 | } |
65 | ||
7ea7b4a1 AQ |
66 | /** |
67 | * batadv_orig_node_vlan_get - get an orig_node_vlan object | |
68 | * @orig_node: the originator serving the VLAN | |
69 | * @vid: the VLAN identifier | |
70 | * | |
62fe710f | 71 | * Return: the vlan object identified by vid and belonging to orig_node or NULL |
7ea7b4a1 AQ |
72 | * if it does not exist. |
73 | */ | |
74 | struct batadv_orig_node_vlan * | |
75 | batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, | |
76 | unsigned short vid) | |
77 | { | |
78 | struct batadv_orig_node_vlan *vlan = NULL, *tmp; | |
79 | ||
80 | rcu_read_lock(); | |
d0fa4f3f | 81 | hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) { |
7ea7b4a1 AQ |
82 | if (tmp->vid != vid) |
83 | continue; | |
84 | ||
161a3be9 | 85 | if (!kref_get_unless_zero(&tmp->refcount)) |
7ea7b4a1 AQ |
86 | continue; |
87 | ||
88 | vlan = tmp; | |
89 | ||
90 | break; | |
91 | } | |
92 | rcu_read_unlock(); | |
93 | ||
94 | return vlan; | |
95 | } | |
96 | ||
97 | /** | |
98 | * batadv_orig_node_vlan_new - search and possibly create an orig_node_vlan | |
99 | * object | |
100 | * @orig_node: the originator serving the VLAN | |
101 | * @vid: the VLAN identifier | |
102 | * | |
62fe710f | 103 | * Return: NULL in case of failure or the vlan object identified by vid and |
7ea7b4a1 AQ |
104 | * belonging to orig_node otherwise. The object is created and added to the list |
105 | * if it does not exist. | |
106 | * | |
107 | * The object is returned with refcounter increased by 1. | |
108 | */ | |
109 | struct batadv_orig_node_vlan * | |
110 | batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, | |
111 | unsigned short vid) | |
112 | { | |
113 | struct batadv_orig_node_vlan *vlan; | |
114 | ||
115 | spin_lock_bh(&orig_node->vlan_list_lock); | |
116 | ||
117 | /* first look if an object for this vid already exists */ | |
118 | vlan = batadv_orig_node_vlan_get(orig_node, vid); | |
119 | if (vlan) | |
120 | goto out; | |
121 | ||
122 | vlan = kzalloc(sizeof(*vlan), GFP_ATOMIC); | |
123 | if (!vlan) | |
124 | goto out; | |
125 | ||
161a3be9 SE |
126 | kref_init(&vlan->refcount); |
127 | kref_get(&vlan->refcount); | |
7ea7b4a1 AQ |
128 | vlan->vid = vid; |
129 | ||
d0fa4f3f | 130 | hlist_add_head_rcu(&vlan->list, &orig_node->vlan_list); |
7ea7b4a1 AQ |
131 | |
132 | out: | |
133 | spin_unlock_bh(&orig_node->vlan_list_lock); | |
134 | ||
135 | return vlan; | |
136 | } | |
137 | ||
138 | /** | |
161a3be9 SE |
139 | * batadv_orig_node_vlan_release - release originator-vlan object from lists |
140 | * and queue for free after rcu grace period | |
141 | * @ref: kref pointer of the originator-vlan object | |
142 | */ | |
143 | static void batadv_orig_node_vlan_release(struct kref *ref) | |
144 | { | |
145 | struct batadv_orig_node_vlan *orig_vlan; | |
146 | ||
147 | orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount); | |
148 | ||
149 | kfree_rcu(orig_vlan, rcu); | |
150 | } | |
151 | ||
152 | /** | |
153 | * batadv_orig_node_vlan_free_ref - decrement the refcounter and possibly | |
154 | * release the originator-vlan object | |
7ea7b4a1 AQ |
155 | * @orig_vlan: the originator-vlan object to release |
156 | */ | |
157 | void batadv_orig_node_vlan_free_ref(struct batadv_orig_node_vlan *orig_vlan) | |
158 | { | |
161a3be9 | 159 | kref_put(&orig_vlan->refcount, batadv_orig_node_vlan_release); |
7ea7b4a1 AQ |
160 | } |
161 | ||
56303d34 | 162 | int batadv_originator_init(struct batadv_priv *bat_priv) |
c6c8fea2 SE |
163 | { |
164 | if (bat_priv->orig_hash) | |
5346c35e | 165 | return 0; |
c6c8fea2 | 166 | |
1a8eaf07 | 167 | bat_priv->orig_hash = batadv_hash_new(1024); |
c6c8fea2 SE |
168 | |
169 | if (!bat_priv->orig_hash) | |
170 | goto err; | |
171 | ||
dec05074 AQ |
172 | batadv_hash_set_lock_class(bat_priv->orig_hash, |
173 | &batadv_orig_hash_lock_class_key); | |
174 | ||
72414442 AQ |
175 | INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); |
176 | queue_delayed_work(batadv_event_workqueue, | |
177 | &bat_priv->orig_work, | |
178 | msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); | |
179 | ||
5346c35e | 180 | return 0; |
c6c8fea2 SE |
181 | |
182 | err: | |
5346c35e | 183 | return -ENOMEM; |
c6c8fea2 SE |
184 | } |
185 | ||
89652331 | 186 | /** |
ae3e1e36 SE |
187 | * batadv_neigh_ifinfo_release - release neigh_ifinfo from lists and queue for |
188 | * free after rcu grace period | |
962c6832 | 189 | * @ref: kref pointer of the neigh_ifinfo |
89652331 | 190 | */ |
962c6832 | 191 | static void batadv_neigh_ifinfo_release(struct kref *ref) |
89652331 | 192 | { |
962c6832 SE |
193 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
194 | ||
195 | neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount); | |
196 | ||
ae3e1e36 SE |
197 | if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT) |
198 | batadv_hardif_free_ref(neigh_ifinfo->if_outgoing); | |
199 | ||
200 | kfree_rcu(neigh_ifinfo, rcu); | |
89652331 SW |
201 | } |
202 | ||
203 | /** | |
ae3e1e36 | 204 | * batadv_neigh_ifinfo_free_ref - decrement the refcounter and possibly release |
89652331 SW |
205 | * the neigh_ifinfo |
206 | * @neigh_ifinfo: the neigh_ifinfo object to release | |
207 | */ | |
208 | void batadv_neigh_ifinfo_free_ref(struct batadv_neigh_ifinfo *neigh_ifinfo) | |
209 | { | |
962c6832 | 210 | kref_put(&neigh_ifinfo->refcount, batadv_neigh_ifinfo_release); |
89652331 SW |
211 | } |
212 | ||
cef63419 | 213 | /** |
f6389692 SE |
214 | * batadv_hardif_neigh_release - release hardif neigh node from lists and |
215 | * queue for free after rcu grace period | |
90f564df | 216 | * @ref: kref pointer of the neigh_node |
cef63419 | 217 | */ |
90f564df | 218 | static void batadv_hardif_neigh_release(struct kref *ref) |
cef63419 | 219 | { |
90f564df SE |
220 | struct batadv_hardif_neigh_node *hardif_neigh; |
221 | ||
222 | hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node, | |
223 | refcount); | |
224 | ||
f6389692 SE |
225 | spin_lock_bh(&hardif_neigh->if_incoming->neigh_list_lock); |
226 | hlist_del_init_rcu(&hardif_neigh->list); | |
227 | spin_unlock_bh(&hardif_neigh->if_incoming->neigh_list_lock); | |
bab7c6c3 | 228 | |
f6389692 SE |
229 | batadv_hardif_free_ref(hardif_neigh->if_incoming); |
230 | kfree_rcu(hardif_neigh, rcu); | |
cef63419 ML |
231 | } |
232 | ||
233 | /** | |
234 | * batadv_hardif_neigh_free_ref - decrement the hardif neighbors refcounter | |
f6389692 | 235 | * and possibly release it |
cef63419 ML |
236 | * @hardif_neigh: hardif neigh neighbor to free |
237 | */ | |
238 | void batadv_hardif_neigh_free_ref(struct batadv_hardif_neigh_node *hardif_neigh) | |
239 | { | |
90f564df | 240 | kref_put(&hardif_neigh->refcount, batadv_hardif_neigh_release); |
cef63419 ML |
241 | } |
242 | ||
89652331 | 243 | /** |
b4d922cf SE |
244 | * batadv_neigh_node_release - release neigh_node from lists and queue for |
245 | * free after rcu grace period | |
77ae32e8 | 246 | * @ref: kref pointer of the neigh_node |
89652331 | 247 | */ |
77ae32e8 | 248 | static void batadv_neigh_node_release(struct kref *ref) |
89652331 SW |
249 | { |
250 | struct hlist_node *node_tmp; | |
77ae32e8 | 251 | struct batadv_neigh_node *neigh_node; |
cef63419 | 252 | struct batadv_hardif_neigh_node *hardif_neigh; |
89652331 | 253 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
bcef1f3c | 254 | struct batadv_algo_ops *bao; |
89652331 | 255 | |
77ae32e8 | 256 | neigh_node = container_of(ref, struct batadv_neigh_node, refcount); |
bcef1f3c | 257 | bao = neigh_node->orig_node->bat_priv->bat_algo_ops; |
89652331 SW |
258 | |
259 | hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, | |
260 | &neigh_node->ifinfo_list, list) { | |
ae3e1e36 | 261 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); |
89652331 | 262 | } |
bcef1f3c | 263 | |
cef63419 ML |
264 | hardif_neigh = batadv_hardif_neigh_get(neigh_node->if_incoming, |
265 | neigh_node->addr); | |
266 | if (hardif_neigh) { | |
267 | /* batadv_hardif_neigh_get() increases refcount too */ | |
f6389692 SE |
268 | batadv_hardif_neigh_free_ref(hardif_neigh); |
269 | batadv_hardif_neigh_free_ref(hardif_neigh); | |
cef63419 ML |
270 | } |
271 | ||
bcef1f3c AQ |
272 | if (bao->bat_neigh_free) |
273 | bao->bat_neigh_free(neigh_node); | |
274 | ||
b4d922cf | 275 | batadv_hardif_free_ref(neigh_node->if_incoming); |
89652331 | 276 | |
b4d922cf | 277 | kfree_rcu(neigh_node, rcu); |
89652331 SW |
278 | } |
279 | ||
89652331 | 280 | /** |
77ae32e8 SE |
281 | * batadv_neigh_node_free_ref - decrement the neighbors refcounter and possibly |
282 | * release it | |
89652331 SW |
283 | * @neigh_node: neigh neighbor to free |
284 | */ | |
56303d34 | 285 | void batadv_neigh_node_free_ref(struct batadv_neigh_node *neigh_node) |
a4c135c5 | 286 | { |
77ae32e8 | 287 | kref_put(&neigh_node->refcount, batadv_neigh_node_release); |
a4c135c5 SW |
288 | } |
289 | ||
7351a482 SW |
290 | /** |
291 | * batadv_orig_node_get_router - router to the originator depending on iface | |
292 | * @orig_node: the orig node for the router | |
293 | * @if_outgoing: the interface where the payload packet has been received or | |
294 | * the OGM should be sent to | |
295 | * | |
62fe710f | 296 | * Return: the neighbor which should be router for this orig_node/iface. |
7351a482 SW |
297 | * |
298 | * The object is returned with refcounter increased by 1. | |
299 | */ | |
56303d34 | 300 | struct batadv_neigh_node * |
7351a482 SW |
301 | batadv_orig_router_get(struct batadv_orig_node *orig_node, |
302 | const struct batadv_hard_iface *if_outgoing) | |
e1a5382f | 303 | { |
7351a482 SW |
304 | struct batadv_orig_ifinfo *orig_ifinfo; |
305 | struct batadv_neigh_node *router = NULL; | |
e1a5382f LL |
306 | |
307 | rcu_read_lock(); | |
7351a482 SW |
308 | hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) { |
309 | if (orig_ifinfo->if_outgoing != if_outgoing) | |
310 | continue; | |
311 | ||
312 | router = rcu_dereference(orig_ifinfo->router); | |
313 | break; | |
314 | } | |
e1a5382f | 315 | |
77ae32e8 | 316 | if (router && !kref_get_unless_zero(&router->refcount)) |
e1a5382f LL |
317 | router = NULL; |
318 | ||
319 | rcu_read_unlock(); | |
320 | return router; | |
321 | } | |
322 | ||
7351a482 SW |
323 | /** |
324 | * batadv_orig_ifinfo_get - find the ifinfo from an orig_node | |
325 | * @orig_node: the orig node to be queried | |
326 | * @if_outgoing: the interface for which the ifinfo should be acquired | |
327 | * | |
62fe710f | 328 | * Return: the requested orig_ifinfo or NULL if not found. |
7351a482 SW |
329 | * |
330 | * The object is returned with refcounter increased by 1. | |
331 | */ | |
332 | struct batadv_orig_ifinfo * | |
333 | batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, | |
334 | struct batadv_hard_iface *if_outgoing) | |
335 | { | |
336 | struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL; | |
337 | ||
338 | rcu_read_lock(); | |
339 | hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list, | |
340 | list) { | |
341 | if (tmp->if_outgoing != if_outgoing) | |
342 | continue; | |
343 | ||
a6ba0d34 | 344 | if (!kref_get_unless_zero(&tmp->refcount)) |
7351a482 SW |
345 | continue; |
346 | ||
347 | orig_ifinfo = tmp; | |
348 | break; | |
349 | } | |
350 | rcu_read_unlock(); | |
351 | ||
352 | return orig_ifinfo; | |
353 | } | |
354 | ||
355 | /** | |
356 | * batadv_orig_ifinfo_new - search and possibly create an orig_ifinfo object | |
357 | * @orig_node: the orig node to be queried | |
358 | * @if_outgoing: the interface for which the ifinfo should be acquired | |
359 | * | |
62fe710f | 360 | * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing |
7351a482 SW |
361 | * interface otherwise. The object is created and added to the list |
362 | * if it does not exist. | |
363 | * | |
364 | * The object is returned with refcounter increased by 1. | |
365 | */ | |
366 | struct batadv_orig_ifinfo * | |
367 | batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, | |
368 | struct batadv_hard_iface *if_outgoing) | |
369 | { | |
370 | struct batadv_orig_ifinfo *orig_ifinfo = NULL; | |
371 | unsigned long reset_time; | |
372 | ||
373 | spin_lock_bh(&orig_node->neigh_list_lock); | |
374 | ||
375 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing); | |
376 | if (orig_ifinfo) | |
377 | goto out; | |
378 | ||
379 | orig_ifinfo = kzalloc(sizeof(*orig_ifinfo), GFP_ATOMIC); | |
380 | if (!orig_ifinfo) | |
381 | goto out; | |
382 | ||
383 | if (if_outgoing != BATADV_IF_DEFAULT && | |
7a659d56 | 384 | !kref_get_unless_zero(&if_outgoing->refcount)) { |
7351a482 SW |
385 | kfree(orig_ifinfo); |
386 | orig_ifinfo = NULL; | |
387 | goto out; | |
388 | } | |
389 | ||
390 | reset_time = jiffies - 1; | |
391 | reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); | |
392 | orig_ifinfo->batman_seqno_reset = reset_time; | |
393 | orig_ifinfo->if_outgoing = if_outgoing; | |
394 | INIT_HLIST_NODE(&orig_ifinfo->list); | |
a6ba0d34 SE |
395 | kref_init(&orig_ifinfo->refcount); |
396 | kref_get(&orig_ifinfo->refcount); | |
7351a482 SW |
397 | hlist_add_head_rcu(&orig_ifinfo->list, |
398 | &orig_node->ifinfo_list); | |
399 | out: | |
400 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
401 | return orig_ifinfo; | |
402 | } | |
403 | ||
89652331 SW |
404 | /** |
405 | * batadv_neigh_ifinfo_get - find the ifinfo from an neigh_node | |
e51f0397 | 406 | * @neigh: the neigh node to be queried |
89652331 SW |
407 | * @if_outgoing: the interface for which the ifinfo should be acquired |
408 | * | |
409 | * The object is returned with refcounter increased by 1. | |
410 | * | |
62fe710f | 411 | * Return: the requested neigh_ifinfo or NULL if not found |
89652331 SW |
412 | */ |
413 | struct batadv_neigh_ifinfo * | |
414 | batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, | |
415 | struct batadv_hard_iface *if_outgoing) | |
416 | { | |
417 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL, | |
418 | *tmp_neigh_ifinfo; | |
419 | ||
420 | rcu_read_lock(); | |
421 | hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list, | |
422 | list) { | |
423 | if (tmp_neigh_ifinfo->if_outgoing != if_outgoing) | |
424 | continue; | |
425 | ||
962c6832 | 426 | if (!kref_get_unless_zero(&tmp_neigh_ifinfo->refcount)) |
89652331 SW |
427 | continue; |
428 | ||
429 | neigh_ifinfo = tmp_neigh_ifinfo; | |
430 | break; | |
431 | } | |
432 | rcu_read_unlock(); | |
433 | ||
434 | return neigh_ifinfo; | |
435 | } | |
436 | ||
437 | /** | |
438 | * batadv_neigh_ifinfo_new - search and possibly create an neigh_ifinfo object | |
e51f0397 | 439 | * @neigh: the neigh node to be queried |
89652331 SW |
440 | * @if_outgoing: the interface for which the ifinfo should be acquired |
441 | * | |
62fe710f | 442 | * Return: NULL in case of failure or the neigh_ifinfo object for the |
89652331 SW |
443 | * if_outgoing interface otherwise. The object is created and added to the list |
444 | * if it does not exist. | |
445 | * | |
446 | * The object is returned with refcounter increased by 1. | |
447 | */ | |
448 | struct batadv_neigh_ifinfo * | |
449 | batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, | |
450 | struct batadv_hard_iface *if_outgoing) | |
451 | { | |
452 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
453 | ||
454 | spin_lock_bh(&neigh->ifinfo_lock); | |
455 | ||
456 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing); | |
457 | if (neigh_ifinfo) | |
458 | goto out; | |
459 | ||
460 | neigh_ifinfo = kzalloc(sizeof(*neigh_ifinfo), GFP_ATOMIC); | |
461 | if (!neigh_ifinfo) | |
462 | goto out; | |
463 | ||
7a659d56 | 464 | if (if_outgoing && !kref_get_unless_zero(&if_outgoing->refcount)) { |
89652331 SW |
465 | kfree(neigh_ifinfo); |
466 | neigh_ifinfo = NULL; | |
467 | goto out; | |
468 | } | |
469 | ||
470 | INIT_HLIST_NODE(&neigh_ifinfo->list); | |
962c6832 SE |
471 | kref_init(&neigh_ifinfo->refcount); |
472 | kref_get(&neigh_ifinfo->refcount); | |
89652331 SW |
473 | neigh_ifinfo->if_outgoing = if_outgoing; |
474 | ||
475 | hlist_add_head_rcu(&neigh_ifinfo->list, &neigh->ifinfo_list); | |
476 | ||
477 | out: | |
478 | spin_unlock_bh(&neigh->ifinfo_lock); | |
479 | ||
480 | return neigh_ifinfo; | |
481 | } | |
482 | ||
ed292663 ML |
483 | /** |
484 | * batadv_neigh_node_get - retrieve a neighbour from the list | |
485 | * @orig_node: originator which the neighbour belongs to | |
486 | * @hard_iface: the interface where this neighbour is connected to | |
487 | * @addr: the address of the neighbour | |
488 | * | |
489 | * Looks for and possibly returns a neighbour belonging to this originator list | |
490 | * which is connected through the provided hard interface. | |
62fe710f SE |
491 | * |
492 | * Return: neighbor when found. Othwerwise NULL | |
ed292663 ML |
493 | */ |
494 | static struct batadv_neigh_node * | |
495 | batadv_neigh_node_get(const struct batadv_orig_node *orig_node, | |
496 | const struct batadv_hard_iface *hard_iface, | |
497 | const u8 *addr) | |
498 | { | |
499 | struct batadv_neigh_node *tmp_neigh_node, *res = NULL; | |
500 | ||
501 | rcu_read_lock(); | |
502 | hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) { | |
503 | if (!batadv_compare_eth(tmp_neigh_node->addr, addr)) | |
504 | continue; | |
505 | ||
506 | if (tmp_neigh_node->if_incoming != hard_iface) | |
507 | continue; | |
508 | ||
77ae32e8 | 509 | if (!kref_get_unless_zero(&tmp_neigh_node->refcount)) |
ed292663 ML |
510 | continue; |
511 | ||
512 | res = tmp_neigh_node; | |
513 | break; | |
514 | } | |
515 | rcu_read_unlock(); | |
516 | ||
517 | return res; | |
518 | } | |
519 | ||
cef63419 ML |
520 | /** |
521 | * batadv_hardif_neigh_create - create a hardif neighbour node | |
522 | * @hard_iface: the interface this neighbour is connected to | |
523 | * @neigh_addr: the interface address of the neighbour to retrieve | |
524 | * | |
62fe710f | 525 | * Return: the hardif neighbour node if found or created or NULL otherwise. |
cef63419 ML |
526 | */ |
527 | static struct batadv_hardif_neigh_node * | |
528 | batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, | |
529 | const u8 *neigh_addr) | |
530 | { | |
8248a4c7 | 531 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
cef63419 ML |
532 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
533 | ||
534 | spin_lock_bh(&hard_iface->neigh_list_lock); | |
535 | ||
536 | /* check if neighbor hasn't been added in the meantime */ | |
537 | hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); | |
538 | if (hardif_neigh) | |
539 | goto out; | |
540 | ||
7a659d56 | 541 | if (!kref_get_unless_zero(&hard_iface->refcount)) |
cef63419 ML |
542 | goto out; |
543 | ||
544 | hardif_neigh = kzalloc(sizeof(*hardif_neigh), GFP_ATOMIC); | |
545 | if (!hardif_neigh) { | |
546 | batadv_hardif_free_ref(hard_iface); | |
547 | goto out; | |
548 | } | |
549 | ||
550 | INIT_HLIST_NODE(&hardif_neigh->list); | |
551 | ether_addr_copy(hardif_neigh->addr, neigh_addr); | |
552 | hardif_neigh->if_incoming = hard_iface; | |
553 | hardif_neigh->last_seen = jiffies; | |
554 | ||
90f564df | 555 | kref_init(&hardif_neigh->refcount); |
cef63419 | 556 | |
8248a4c7 ML |
557 | if (bat_priv->bat_algo_ops->bat_hardif_neigh_init) |
558 | bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh); | |
559 | ||
cef63419 ML |
560 | hlist_add_head(&hardif_neigh->list, &hard_iface->neigh_list); |
561 | ||
562 | out: | |
563 | spin_unlock_bh(&hard_iface->neigh_list_lock); | |
564 | return hardif_neigh; | |
565 | } | |
566 | ||
567 | /** | |
568 | * batadv_hardif_neigh_get_or_create - retrieve or create a hardif neighbour | |
569 | * node | |
570 | * @hard_iface: the interface this neighbour is connected to | |
571 | * @neigh_addr: the interface address of the neighbour to retrieve | |
572 | * | |
62fe710f | 573 | * Return: the hardif neighbour node if found or created or NULL otherwise. |
cef63419 ML |
574 | */ |
575 | static struct batadv_hardif_neigh_node * | |
576 | batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, | |
577 | const u8 *neigh_addr) | |
578 | { | |
579 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; | |
580 | ||
581 | /* first check without locking to avoid the overhead */ | |
582 | hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); | |
583 | if (hardif_neigh) | |
584 | return hardif_neigh; | |
585 | ||
586 | return batadv_hardif_neigh_create(hard_iface, neigh_addr); | |
587 | } | |
588 | ||
589 | /** | |
590 | * batadv_hardif_neigh_get - retrieve a hardif neighbour from the list | |
591 | * @hard_iface: the interface where this neighbour is connected to | |
592 | * @neigh_addr: the address of the neighbour | |
593 | * | |
594 | * Looks for and possibly returns a neighbour belonging to this hard interface. | |
62fe710f SE |
595 | * |
596 | * Return: neighbor when found. Othwerwise NULL | |
cef63419 ML |
597 | */ |
598 | struct batadv_hardif_neigh_node * | |
599 | batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, | |
600 | const u8 *neigh_addr) | |
601 | { | |
602 | struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL; | |
603 | ||
604 | rcu_read_lock(); | |
605 | hlist_for_each_entry_rcu(tmp_hardif_neigh, | |
606 | &hard_iface->neigh_list, list) { | |
607 | if (!batadv_compare_eth(tmp_hardif_neigh->addr, neigh_addr)) | |
608 | continue; | |
609 | ||
90f564df | 610 | if (!kref_get_unless_zero(&tmp_hardif_neigh->refcount)) |
cef63419 ML |
611 | continue; |
612 | ||
613 | hardif_neigh = tmp_hardif_neigh; | |
614 | break; | |
615 | } | |
616 | rcu_read_unlock(); | |
617 | ||
618 | return hardif_neigh; | |
619 | } | |
620 | ||
0538f759 AQ |
621 | /** |
622 | * batadv_neigh_node_new - create and init a new neigh_node object | |
3f32f8a6 | 623 | * @orig_node: originator object representing the neighbour |
0538f759 AQ |
624 | * @hard_iface: the interface where the neighbour is connected to |
625 | * @neigh_addr: the mac address of the neighbour interface | |
0538f759 AQ |
626 | * |
627 | * Allocates a new neigh_node object and initialises all the generic fields. | |
62fe710f SE |
628 | * |
629 | * Return: neighbor when found. Othwerwise NULL | |
0538f759 | 630 | */ |
56303d34 | 631 | struct batadv_neigh_node * |
3f32f8a6 ML |
632 | batadv_neigh_node_new(struct batadv_orig_node *orig_node, |
633 | struct batadv_hard_iface *hard_iface, | |
634 | const u8 *neigh_addr) | |
c6c8fea2 | 635 | { |
56303d34 | 636 | struct batadv_neigh_node *neigh_node; |
cef63419 | 637 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
c6c8fea2 | 638 | |
741aa06b ML |
639 | neigh_node = batadv_neigh_node_get(orig_node, hard_iface, neigh_addr); |
640 | if (neigh_node) | |
641 | goto out; | |
642 | ||
cef63419 ML |
643 | hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface, |
644 | neigh_addr); | |
645 | if (!hardif_neigh) | |
646 | goto out; | |
647 | ||
704509b8 | 648 | neigh_node = kzalloc(sizeof(*neigh_node), GFP_ATOMIC); |
c6c8fea2 | 649 | if (!neigh_node) |
7ae8b285 | 650 | goto out; |
c6c8fea2 | 651 | |
7a659d56 | 652 | if (!kref_get_unless_zero(&hard_iface->refcount)) { |
f729dc70 ML |
653 | kfree(neigh_node); |
654 | neigh_node = NULL; | |
655 | goto out; | |
656 | } | |
657 | ||
9591a79f | 658 | INIT_HLIST_NODE(&neigh_node->list); |
89652331 SW |
659 | INIT_HLIST_HEAD(&neigh_node->ifinfo_list); |
660 | spin_lock_init(&neigh_node->ifinfo_lock); | |
c6c8fea2 | 661 | |
8fdd0153 | 662 | ether_addr_copy(neigh_node->addr, neigh_addr); |
0538f759 AQ |
663 | neigh_node->if_incoming = hard_iface; |
664 | neigh_node->orig_node = orig_node; | |
665 | ||
1605d0d6 | 666 | /* extra reference for return */ |
77ae32e8 SE |
667 | kref_init(&neigh_node->refcount); |
668 | kref_get(&neigh_node->refcount); | |
c6c8fea2 | 669 | |
741aa06b ML |
670 | spin_lock_bh(&orig_node->neigh_list_lock); |
671 | hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list); | |
672 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
673 | ||
cef63419 | 674 | /* increment unique neighbor refcount */ |
90f564df | 675 | kref_get(&hardif_neigh->refcount); |
cef63419 | 676 | |
741aa06b ML |
677 | batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv, |
678 | "Creating new neighbor %pM for orig_node %pM on interface %s\n", | |
679 | neigh_addr, orig_node->orig, hard_iface->net_dev->name); | |
680 | ||
7ae8b285 | 681 | out: |
cef63419 ML |
682 | if (hardif_neigh) |
683 | batadv_hardif_neigh_free_ref(hardif_neigh); | |
c6c8fea2 SE |
684 | return neigh_node; |
685 | } | |
686 | ||
7587405a ML |
687 | /** |
688 | * batadv_hardif_neigh_seq_print_text - print the single hop neighbour list | |
689 | * @seq: neighbour table seq_file struct | |
690 | * @offset: not used | |
691 | * | |
62fe710f | 692 | * Return: always 0 |
7587405a ML |
693 | */ |
694 | int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset) | |
695 | { | |
696 | struct net_device *net_dev = (struct net_device *)seq->private; | |
697 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
698 | struct batadv_hard_iface *primary_if; | |
699 | ||
700 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
701 | if (!primary_if) | |
702 | return 0; | |
703 | ||
704 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n", | |
705 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, | |
706 | primary_if->net_dev->dev_addr, net_dev->name, | |
707 | bat_priv->bat_algo_ops->name); | |
708 | ||
709 | batadv_hardif_free_ref(primary_if); | |
710 | ||
711 | if (!bat_priv->bat_algo_ops->bat_neigh_print) { | |
712 | seq_puts(seq, | |
713 | "No printing function for this routing protocol\n"); | |
714 | return 0; | |
715 | } | |
716 | ||
717 | bat_priv->bat_algo_ops->bat_neigh_print(bat_priv, seq); | |
718 | return 0; | |
719 | } | |
720 | ||
7351a482 | 721 | /** |
2baa753c SE |
722 | * batadv_orig_ifinfo_release - release orig_ifinfo from lists and queue for |
723 | * free after rcu grace period | |
a6ba0d34 | 724 | * @ref: kref pointer of the orig_ifinfo |
7351a482 | 725 | */ |
a6ba0d34 | 726 | static void batadv_orig_ifinfo_release(struct kref *ref) |
7351a482 | 727 | { |
a6ba0d34 | 728 | struct batadv_orig_ifinfo *orig_ifinfo; |
000c8dff | 729 | struct batadv_neigh_node *router; |
7351a482 | 730 | |
a6ba0d34 SE |
731 | orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount); |
732 | ||
7351a482 | 733 | if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT) |
2baa753c | 734 | batadv_hardif_free_ref(orig_ifinfo->if_outgoing); |
7351a482 | 735 | |
000c8dff SW |
736 | /* this is the last reference to this object */ |
737 | router = rcu_dereference_protected(orig_ifinfo->router, true); | |
738 | if (router) | |
2baa753c SE |
739 | batadv_neigh_node_free_ref(router); |
740 | ||
741 | kfree_rcu(orig_ifinfo, rcu); | |
7351a482 SW |
742 | } |
743 | ||
744 | /** | |
deed9660 SE |
745 | * batadv_orig_ifinfo_free_ref - decrement the refcounter and possibly release |
746 | * the orig_ifinfo | |
7351a482 SW |
747 | * @orig_ifinfo: the orig_ifinfo object to release |
748 | */ | |
deed9660 | 749 | void batadv_orig_ifinfo_free_ref(struct batadv_orig_ifinfo *orig_ifinfo) |
7351a482 | 750 | { |
a6ba0d34 | 751 | kref_put(&orig_ifinfo->refcount, batadv_orig_ifinfo_release); |
7351a482 SW |
752 | } |
753 | ||
754 | /** | |
deed9660 SE |
755 | * batadv_orig_node_free_rcu - free the orig_node |
756 | * @rcu: rcu pointer of the orig_node | |
7351a482 | 757 | */ |
deed9660 | 758 | static void batadv_orig_node_free_rcu(struct rcu_head *rcu) |
7351a482 | 759 | { |
deed9660 SE |
760 | struct batadv_orig_node *orig_node; |
761 | ||
762 | orig_node = container_of(rcu, struct batadv_orig_node, rcu); | |
763 | ||
764 | batadv_mcast_purge_orig(orig_node); | |
765 | ||
766 | batadv_frag_purge_orig(orig_node, NULL); | |
767 | ||
768 | if (orig_node->bat_priv->bat_algo_ops->bat_orig_free) | |
769 | orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node); | |
770 | ||
771 | kfree(orig_node->tt_buff); | |
772 | kfree(orig_node); | |
7351a482 SW |
773 | } |
774 | ||
deed9660 SE |
775 | /** |
776 | * batadv_orig_node_release - release orig_node from lists and queue for | |
777 | * free after rcu grace period | |
778 | * @orig_node: the orig node to free | |
779 | */ | |
780 | static void batadv_orig_node_release(struct batadv_orig_node *orig_node) | |
c6c8fea2 | 781 | { |
b67bfe0d | 782 | struct hlist_node *node_tmp; |
f6c8b711 | 783 | struct batadv_neigh_node *neigh_node; |
7351a482 | 784 | struct batadv_orig_ifinfo *orig_ifinfo; |
16b1aba8 | 785 | |
f987ed6e ML |
786 | spin_lock_bh(&orig_node->neigh_list_lock); |
787 | ||
c6c8fea2 | 788 | /* for all neighbors towards this originator ... */ |
b67bfe0d | 789 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
9591a79f | 790 | &orig_node->neigh_list, list) { |
f987ed6e | 791 | hlist_del_rcu(&neigh_node->list); |
deed9660 | 792 | batadv_neigh_node_free_ref(neigh_node); |
c6c8fea2 SE |
793 | } |
794 | ||
7351a482 SW |
795 | hlist_for_each_entry_safe(orig_ifinfo, node_tmp, |
796 | &orig_node->ifinfo_list, list) { | |
797 | hlist_del_rcu(&orig_ifinfo->list); | |
deed9660 | 798 | batadv_orig_ifinfo_free_ref(orig_ifinfo); |
7351a482 | 799 | } |
f987ed6e ML |
800 | spin_unlock_bh(&orig_node->neigh_list_lock); |
801 | ||
d56b1705 MH |
802 | /* Free nc_nodes */ |
803 | batadv_nc_purge_orig(orig_node->bat_priv, orig_node, NULL); | |
804 | ||
deed9660 | 805 | call_rcu(&orig_node->rcu, batadv_orig_node_free_rcu); |
c6c8fea2 SE |
806 | } |
807 | ||
72822225 LL |
808 | /** |
809 | * batadv_orig_node_free_ref - decrement the orig node refcounter and possibly | |
deed9660 | 810 | * release it |
72822225 LL |
811 | * @orig_node: the orig node to free |
812 | */ | |
56303d34 | 813 | void batadv_orig_node_free_ref(struct batadv_orig_node *orig_node) |
7b36e8ee ML |
814 | { |
815 | if (atomic_dec_and_test(&orig_node->refcount)) | |
deed9660 | 816 | batadv_orig_node_release(orig_node); |
7b36e8ee ML |
817 | } |
818 | ||
56303d34 | 819 | void batadv_originator_free(struct batadv_priv *bat_priv) |
c6c8fea2 | 820 | { |
5bf74e9c | 821 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
b67bfe0d | 822 | struct hlist_node *node_tmp; |
16b1aba8 | 823 | struct hlist_head *head; |
16b1aba8 | 824 | spinlock_t *list_lock; /* spinlock to protect write access */ |
56303d34 | 825 | struct batadv_orig_node *orig_node; |
6b5e971a | 826 | u32 i; |
16b1aba8 ML |
827 | |
828 | if (!hash) | |
c6c8fea2 SE |
829 | return; |
830 | ||
831 | cancel_delayed_work_sync(&bat_priv->orig_work); | |
832 | ||
c6c8fea2 | 833 | bat_priv->orig_hash = NULL; |
16b1aba8 ML |
834 | |
835 | for (i = 0; i < hash->size; i++) { | |
836 | head = &hash->table[i]; | |
837 | list_lock = &hash->list_locks[i]; | |
838 | ||
839 | spin_lock_bh(list_lock); | |
b67bfe0d | 840 | hlist_for_each_entry_safe(orig_node, node_tmp, |
7aadf889 | 841 | head, hash_entry) { |
b67bfe0d | 842 | hlist_del_rcu(&orig_node->hash_entry); |
7d211efc | 843 | batadv_orig_node_free_ref(orig_node); |
16b1aba8 ML |
844 | } |
845 | spin_unlock_bh(list_lock); | |
846 | } | |
847 | ||
1a8eaf07 | 848 | batadv_hash_destroy(hash); |
c6c8fea2 SE |
849 | } |
850 | ||
bbad0a5e AQ |
851 | /** |
852 | * batadv_orig_node_new - creates a new orig_node | |
853 | * @bat_priv: the bat priv with all the soft interface information | |
854 | * @addr: the mac address of the originator | |
855 | * | |
856 | * Creates a new originator object and initialise all the generic fields. | |
857 | * The new object is not added to the originator list. | |
62fe710f SE |
858 | * |
859 | * Return: the newly created object or NULL on failure. | |
9cfc7bd6 | 860 | */ |
bbad0a5e | 861 | struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, |
6b5e971a | 862 | const u8 *addr) |
c6c8fea2 | 863 | { |
56303d34 | 864 | struct batadv_orig_node *orig_node; |
7ea7b4a1 | 865 | struct batadv_orig_node_vlan *vlan; |
42d0b044 | 866 | unsigned long reset_time; |
bbad0a5e | 867 | int i; |
c6c8fea2 | 868 | |
39c75a51 SE |
869 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
870 | "Creating new originator: %pM\n", addr); | |
c6c8fea2 | 871 | |
704509b8 | 872 | orig_node = kzalloc(sizeof(*orig_node), GFP_ATOMIC); |
c6c8fea2 SE |
873 | if (!orig_node) |
874 | return NULL; | |
875 | ||
9591a79f | 876 | INIT_HLIST_HEAD(&orig_node->neigh_list); |
d0fa4f3f | 877 | INIT_HLIST_HEAD(&orig_node->vlan_list); |
7351a482 | 878 | INIT_HLIST_HEAD(&orig_node->ifinfo_list); |
f3e0008f | 879 | spin_lock_init(&orig_node->bcast_seqno_lock); |
f987ed6e | 880 | spin_lock_init(&orig_node->neigh_list_lock); |
a73105b8 | 881 | spin_lock_init(&orig_node->tt_buff_lock); |
a70a9aa9 | 882 | spin_lock_init(&orig_node->tt_lock); |
7ea7b4a1 | 883 | spin_lock_init(&orig_node->vlan_list_lock); |
7b36e8ee | 884 | |
d56b1705 MH |
885 | batadv_nc_init_orig(orig_node); |
886 | ||
7b36e8ee ML |
887 | /* extra reference for return */ |
888 | atomic_set(&orig_node->refcount, 2); | |
c6c8fea2 | 889 | |
16b1aba8 | 890 | orig_node->bat_priv = bat_priv; |
8fdd0153 | 891 | ether_addr_copy(orig_node->orig, addr); |
785ea114 | 892 | batadv_dat_init_orig_node_addr(orig_node); |
c8c991bf | 893 | atomic_set(&orig_node->last_ttvn, 0); |
2dafb49d | 894 | orig_node->tt_buff = NULL; |
a73105b8 | 895 | orig_node->tt_buff_len = 0; |
2c667a33 | 896 | orig_node->last_seen = jiffies; |
42d0b044 SE |
897 | reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); |
898 | orig_node->bcast_seqno_reset = reset_time; | |
8a4023c5 | 899 | |
60432d75 LL |
900 | #ifdef CONFIG_BATMAN_ADV_MCAST |
901 | orig_node->mcast_flags = BATADV_NO_FLAGS; | |
8a4023c5 LL |
902 | INIT_HLIST_NODE(&orig_node->mcast_want_all_unsnoopables_node); |
903 | INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv4_node); | |
904 | INIT_HLIST_NODE(&orig_node->mcast_want_all_ipv6_node); | |
905 | spin_lock_init(&orig_node->mcast_handler_lock); | |
60432d75 | 906 | #endif |
c6c8fea2 | 907 | |
7ea7b4a1 AQ |
908 | /* create a vlan object for the "untagged" LAN */ |
909 | vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS); | |
910 | if (!vlan) | |
911 | goto free_orig_node; | |
912 | /* batadv_orig_node_vlan_new() increases the refcounter. | |
913 | * Immediately release vlan since it is not needed anymore in this | |
914 | * context | |
915 | */ | |
916 | batadv_orig_node_vlan_free_ref(vlan); | |
917 | ||
610bfc6b MH |
918 | for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { |
919 | INIT_HLIST_HEAD(&orig_node->fragments[i].head); | |
920 | spin_lock_init(&orig_node->fragments[i].lock); | |
921 | orig_node->fragments[i].size = 0; | |
922 | } | |
923 | ||
c6c8fea2 | 924 | return orig_node; |
c6c8fea2 SE |
925 | free_orig_node: |
926 | kfree(orig_node); | |
927 | return NULL; | |
928 | } | |
929 | ||
709de13f SW |
930 | /** |
931 | * batadv_purge_neigh_ifinfo - purge obsolete ifinfo entries from neighbor | |
932 | * @bat_priv: the bat priv with all the soft interface information | |
933 | * @neigh: orig node which is to be checked | |
934 | */ | |
935 | static void | |
936 | batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, | |
937 | struct batadv_neigh_node *neigh) | |
938 | { | |
939 | struct batadv_neigh_ifinfo *neigh_ifinfo; | |
940 | struct batadv_hard_iface *if_outgoing; | |
941 | struct hlist_node *node_tmp; | |
942 | ||
943 | spin_lock_bh(&neigh->ifinfo_lock); | |
944 | ||
945 | /* for all ifinfo objects for this neighinator */ | |
946 | hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, | |
947 | &neigh->ifinfo_list, list) { | |
948 | if_outgoing = neigh_ifinfo->if_outgoing; | |
949 | ||
950 | /* always keep the default interface */ | |
951 | if (if_outgoing == BATADV_IF_DEFAULT) | |
952 | continue; | |
953 | ||
954 | /* don't purge if the interface is not (going) down */ | |
955 | if ((if_outgoing->if_status != BATADV_IF_INACTIVE) && | |
956 | (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) && | |
957 | (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)) | |
958 | continue; | |
959 | ||
960 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
961 | "neighbor/ifinfo purge: neighbor %pM, iface: %s\n", | |
962 | neigh->addr, if_outgoing->net_dev->name); | |
963 | ||
964 | hlist_del_rcu(&neigh_ifinfo->list); | |
965 | batadv_neigh_ifinfo_free_ref(neigh_ifinfo); | |
966 | } | |
967 | ||
968 | spin_unlock_bh(&neigh->ifinfo_lock); | |
969 | } | |
970 | ||
7351a482 SW |
971 | /** |
972 | * batadv_purge_orig_ifinfo - purge obsolete ifinfo entries from originator | |
973 | * @bat_priv: the bat priv with all the soft interface information | |
974 | * @orig_node: orig node which is to be checked | |
975 | * | |
62fe710f | 976 | * Return: true if any ifinfo entry was purged, false otherwise. |
7351a482 SW |
977 | */ |
978 | static bool | |
979 | batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, | |
980 | struct batadv_orig_node *orig_node) | |
981 | { | |
982 | struct batadv_orig_ifinfo *orig_ifinfo; | |
983 | struct batadv_hard_iface *if_outgoing; | |
984 | struct hlist_node *node_tmp; | |
985 | bool ifinfo_purged = false; | |
986 | ||
987 | spin_lock_bh(&orig_node->neigh_list_lock); | |
988 | ||
989 | /* for all ifinfo objects for this originator */ | |
990 | hlist_for_each_entry_safe(orig_ifinfo, node_tmp, | |
991 | &orig_node->ifinfo_list, list) { | |
992 | if_outgoing = orig_ifinfo->if_outgoing; | |
993 | ||
994 | /* always keep the default interface */ | |
995 | if (if_outgoing == BATADV_IF_DEFAULT) | |
996 | continue; | |
997 | ||
998 | /* don't purge if the interface is not (going) down */ | |
999 | if ((if_outgoing->if_status != BATADV_IF_INACTIVE) && | |
1000 | (if_outgoing->if_status != BATADV_IF_NOT_IN_USE) && | |
1001 | (if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED)) | |
1002 | continue; | |
1003 | ||
1004 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, | |
1005 | "router/ifinfo purge: originator %pM, iface: %s\n", | |
1006 | orig_node->orig, if_outgoing->net_dev->name); | |
1007 | ||
1008 | ifinfo_purged = true; | |
1009 | ||
1010 | hlist_del_rcu(&orig_ifinfo->list); | |
1011 | batadv_orig_ifinfo_free_ref(orig_ifinfo); | |
f3b3d901 SW |
1012 | if (orig_node->last_bonding_candidate == orig_ifinfo) { |
1013 | orig_node->last_bonding_candidate = NULL; | |
1014 | batadv_orig_ifinfo_free_ref(orig_ifinfo); | |
1015 | } | |
7351a482 SW |
1016 | } |
1017 | ||
1018 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
1019 | ||
1020 | return ifinfo_purged; | |
1021 | } | |
1022 | ||
89652331 SW |
1023 | /** |
1024 | * batadv_purge_orig_neighbors - purges neighbors from originator | |
1025 | * @bat_priv: the bat priv with all the soft interface information | |
1026 | * @orig_node: orig node which is to be checked | |
1027 | * | |
62fe710f | 1028 | * Return: true if any neighbor was purged, false otherwise |
89652331 | 1029 | */ |
56303d34 SE |
1030 | static bool |
1031 | batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, | |
89652331 | 1032 | struct batadv_orig_node *orig_node) |
c6c8fea2 | 1033 | { |
b67bfe0d | 1034 | struct hlist_node *node_tmp; |
56303d34 | 1035 | struct batadv_neigh_node *neigh_node; |
c6c8fea2 | 1036 | bool neigh_purged = false; |
0b0094e0 | 1037 | unsigned long last_seen; |
56303d34 | 1038 | struct batadv_hard_iface *if_incoming; |
c6c8fea2 | 1039 | |
f987ed6e ML |
1040 | spin_lock_bh(&orig_node->neigh_list_lock); |
1041 | ||
c6c8fea2 | 1042 | /* for all neighbors towards this originator ... */ |
b67bfe0d | 1043 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
9591a79f | 1044 | &orig_node->neigh_list, list) { |
1eda58bf SE |
1045 | last_seen = neigh_node->last_seen; |
1046 | if_incoming = neigh_node->if_incoming; | |
1047 | ||
42d0b044 | 1048 | if ((batadv_has_timed_out(last_seen, BATADV_PURGE_TIMEOUT)) || |
e9a4f295 SE |
1049 | (if_incoming->if_status == BATADV_IF_INACTIVE) || |
1050 | (if_incoming->if_status == BATADV_IF_NOT_IN_USE) || | |
1051 | (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) { | |
e9a4f295 SE |
1052 | if ((if_incoming->if_status == BATADV_IF_INACTIVE) || |
1053 | (if_incoming->if_status == BATADV_IF_NOT_IN_USE) || | |
1054 | (if_incoming->if_status == BATADV_IF_TO_BE_REMOVED)) | |
39c75a51 | 1055 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1056 | "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n", |
1057 | orig_node->orig, neigh_node->addr, | |
1058 | if_incoming->net_dev->name); | |
c6c8fea2 | 1059 | else |
39c75a51 | 1060 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1061 | "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n", |
1062 | orig_node->orig, neigh_node->addr, | |
1063 | jiffies_to_msecs(last_seen)); | |
c6c8fea2 SE |
1064 | |
1065 | neigh_purged = true; | |
9591a79f | 1066 | |
f987ed6e | 1067 | hlist_del_rcu(&neigh_node->list); |
7d211efc | 1068 | batadv_neigh_node_free_ref(neigh_node); |
709de13f SW |
1069 | } else { |
1070 | /* only necessary if not the whole neighbor is to be | |
1071 | * deleted, but some interface has been removed. | |
1072 | */ | |
1073 | batadv_purge_neigh_ifinfo(bat_priv, neigh_node); | |
c6c8fea2 SE |
1074 | } |
1075 | } | |
f987ed6e ML |
1076 | |
1077 | spin_unlock_bh(&orig_node->neigh_list_lock); | |
c6c8fea2 SE |
1078 | return neigh_purged; |
1079 | } | |
1080 | ||
89652331 SW |
1081 | /** |
1082 | * batadv_find_best_neighbor - finds the best neighbor after purging | |
1083 | * @bat_priv: the bat priv with all the soft interface information | |
1084 | * @orig_node: orig node which is to be checked | |
1085 | * @if_outgoing: the interface for which the metric should be compared | |
1086 | * | |
62fe710f | 1087 | * Return: the current best neighbor, with refcount increased. |
89652331 SW |
1088 | */ |
1089 | static struct batadv_neigh_node * | |
1090 | batadv_find_best_neighbor(struct batadv_priv *bat_priv, | |
1091 | struct batadv_orig_node *orig_node, | |
1092 | struct batadv_hard_iface *if_outgoing) | |
1093 | { | |
1094 | struct batadv_neigh_node *best = NULL, *neigh; | |
1095 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; | |
1096 | ||
1097 | rcu_read_lock(); | |
1098 | hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) { | |
1099 | if (best && (bao->bat_neigh_cmp(neigh, if_outgoing, | |
1100 | best, if_outgoing) <= 0)) | |
1101 | continue; | |
1102 | ||
77ae32e8 | 1103 | if (!kref_get_unless_zero(&neigh->refcount)) |
89652331 SW |
1104 | continue; |
1105 | ||
1106 | if (best) | |
1107 | batadv_neigh_node_free_ref(best); | |
1108 | ||
1109 | best = neigh; | |
1110 | } | |
1111 | rcu_read_unlock(); | |
1112 | ||
1113 | return best; | |
1114 | } | |
1115 | ||
7351a482 SW |
1116 | /** |
1117 | * batadv_purge_orig_node - purges obsolete information from an orig_node | |
1118 | * @bat_priv: the bat priv with all the soft interface information | |
1119 | * @orig_node: orig node which is to be checked | |
1120 | * | |
1121 | * This function checks if the orig_node or substructures of it have become | |
1122 | * obsolete, and purges this information if that's the case. | |
1123 | * | |
62fe710f | 1124 | * Return: true if the orig_node is to be removed, false otherwise. |
7351a482 | 1125 | */ |
56303d34 SE |
1126 | static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, |
1127 | struct batadv_orig_node *orig_node) | |
c6c8fea2 | 1128 | { |
56303d34 | 1129 | struct batadv_neigh_node *best_neigh_node; |
7351a482 | 1130 | struct batadv_hard_iface *hard_iface; |
7b955a9f | 1131 | bool changed_ifinfo, changed_neigh; |
c6c8fea2 | 1132 | |
42d0b044 SE |
1133 | if (batadv_has_timed_out(orig_node->last_seen, |
1134 | 2 * BATADV_PURGE_TIMEOUT)) { | |
39c75a51 | 1135 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1eda58bf SE |
1136 | "Originator timeout: originator %pM, last_seen %u\n", |
1137 | orig_node->orig, | |
1138 | jiffies_to_msecs(orig_node->last_seen)); | |
c6c8fea2 | 1139 | return true; |
c6c8fea2 | 1140 | } |
7b955a9f SW |
1141 | changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node); |
1142 | changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node); | |
7351a482 | 1143 | |
7b955a9f | 1144 | if (!changed_ifinfo && !changed_neigh) |
89652331 SW |
1145 | return false; |
1146 | ||
7351a482 | 1147 | /* first for NULL ... */ |
89652331 SW |
1148 | best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node, |
1149 | BATADV_IF_DEFAULT); | |
7351a482 SW |
1150 | batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT, |
1151 | best_neigh_node); | |
89652331 SW |
1152 | if (best_neigh_node) |
1153 | batadv_neigh_node_free_ref(best_neigh_node); | |
c6c8fea2 | 1154 | |
7351a482 SW |
1155 | /* ... then for all other interfaces. */ |
1156 | rcu_read_lock(); | |
1157 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { | |
1158 | if (hard_iface->if_status != BATADV_IF_ACTIVE) | |
1159 | continue; | |
1160 | ||
1161 | if (hard_iface->soft_iface != bat_priv->soft_iface) | |
1162 | continue; | |
1163 | ||
1164 | best_neigh_node = batadv_find_best_neighbor(bat_priv, | |
1165 | orig_node, | |
1166 | hard_iface); | |
1167 | batadv_update_route(bat_priv, orig_node, hard_iface, | |
1168 | best_neigh_node); | |
1169 | if (best_neigh_node) | |
1170 | batadv_neigh_node_free_ref(best_neigh_node); | |
1171 | } | |
1172 | rcu_read_unlock(); | |
1173 | ||
c6c8fea2 SE |
1174 | return false; |
1175 | } | |
1176 | ||
56303d34 | 1177 | static void _batadv_purge_orig(struct batadv_priv *bat_priv) |
c6c8fea2 | 1178 | { |
5bf74e9c | 1179 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
b67bfe0d | 1180 | struct hlist_node *node_tmp; |
c6c8fea2 | 1181 | struct hlist_head *head; |
fb778ea1 | 1182 | spinlock_t *list_lock; /* spinlock to protect write access */ |
56303d34 | 1183 | struct batadv_orig_node *orig_node; |
6b5e971a | 1184 | u32 i; |
c6c8fea2 SE |
1185 | |
1186 | if (!hash) | |
1187 | return; | |
1188 | ||
c6c8fea2 SE |
1189 | /* for all origins... */ |
1190 | for (i = 0; i < hash->size; i++) { | |
1191 | head = &hash->table[i]; | |
fb778ea1 | 1192 | list_lock = &hash->list_locks[i]; |
c6c8fea2 | 1193 | |
fb778ea1 | 1194 | spin_lock_bh(list_lock); |
b67bfe0d | 1195 | hlist_for_each_entry_safe(orig_node, node_tmp, |
7aadf889 | 1196 | head, hash_entry) { |
03fc7f86 | 1197 | if (batadv_purge_orig_node(bat_priv, orig_node)) { |
414254e3 | 1198 | batadv_gw_node_delete(bat_priv, orig_node); |
b67bfe0d | 1199 | hlist_del_rcu(&orig_node->hash_entry); |
9d31b3ce LL |
1200 | batadv_tt_global_del_orig(orig_node->bat_priv, |
1201 | orig_node, -1, | |
1202 | "originator timed out"); | |
7d211efc | 1203 | batadv_orig_node_free_ref(orig_node); |
fb778ea1 | 1204 | continue; |
c6c8fea2 | 1205 | } |
610bfc6b MH |
1206 | |
1207 | batadv_frag_purge_orig(orig_node, | |
1208 | batadv_frag_check_entry); | |
c6c8fea2 | 1209 | } |
fb778ea1 | 1210 | spin_unlock_bh(list_lock); |
c6c8fea2 SE |
1211 | } |
1212 | ||
7cf06bc6 | 1213 | batadv_gw_election(bat_priv); |
c6c8fea2 SE |
1214 | } |
1215 | ||
03fc7f86 | 1216 | static void batadv_purge_orig(struct work_struct *work) |
c6c8fea2 | 1217 | { |
56303d34 SE |
1218 | struct delayed_work *delayed_work; |
1219 | struct batadv_priv *bat_priv; | |
c6c8fea2 | 1220 | |
56303d34 SE |
1221 | delayed_work = container_of(work, struct delayed_work, work); |
1222 | bat_priv = container_of(delayed_work, struct batadv_priv, orig_work); | |
03fc7f86 | 1223 | _batadv_purge_orig(bat_priv); |
72414442 AQ |
1224 | queue_delayed_work(batadv_event_workqueue, |
1225 | &bat_priv->orig_work, | |
1226 | msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); | |
c6c8fea2 SE |
1227 | } |
1228 | ||
56303d34 | 1229 | void batadv_purge_orig_ref(struct batadv_priv *bat_priv) |
c6c8fea2 | 1230 | { |
03fc7f86 | 1231 | _batadv_purge_orig(bat_priv); |
c6c8fea2 SE |
1232 | } |
1233 | ||
7d211efc | 1234 | int batadv_orig_seq_print_text(struct seq_file *seq, void *offset) |
c6c8fea2 SE |
1235 | { |
1236 | struct net_device *net_dev = (struct net_device *)seq->private; | |
56303d34 | 1237 | struct batadv_priv *bat_priv = netdev_priv(net_dev); |
56303d34 | 1238 | struct batadv_hard_iface *primary_if; |
32ae9b22 | 1239 | |
30da63a6 ML |
1240 | primary_if = batadv_seq_print_text_primary_if_get(seq); |
1241 | if (!primary_if) | |
737a2a22 | 1242 | return 0; |
c6c8fea2 | 1243 | |
737a2a22 | 1244 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n", |
42d0b044 | 1245 | BATADV_SOURCE_VERSION, primary_if->net_dev->name, |
737a2a22 AQ |
1246 | primary_if->net_dev->dev_addr, net_dev->name, |
1247 | bat_priv->bat_algo_ops->name); | |
c6c8fea2 | 1248 | |
737a2a22 | 1249 | batadv_hardif_free_ref(primary_if); |
c6c8fea2 | 1250 | |
737a2a22 AQ |
1251 | if (!bat_priv->bat_algo_ops->bat_orig_print) { |
1252 | seq_puts(seq, | |
1253 | "No printing function for this routing protocol\n"); | |
1254 | return 0; | |
c6c8fea2 SE |
1255 | } |
1256 | ||
cb1c92ec SW |
1257 | bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, |
1258 | BATADV_IF_DEFAULT); | |
c6c8fea2 | 1259 | |
30da63a6 | 1260 | return 0; |
c6c8fea2 SE |
1261 | } |
1262 | ||
cb1c92ec SW |
1263 | /** |
1264 | * batadv_orig_hardif_seq_print_text - writes originator infos for a specific | |
1265 | * outgoing interface | |
1266 | * @seq: debugfs table seq_file struct | |
1267 | * @offset: not used | |
1268 | * | |
62fe710f | 1269 | * Return: 0 |
cb1c92ec SW |
1270 | */ |
1271 | int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset) | |
1272 | { | |
1273 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1274 | struct batadv_hard_iface *hard_iface; | |
1275 | struct batadv_priv *bat_priv; | |
1276 | ||
1277 | hard_iface = batadv_hardif_get_by_netdev(net_dev); | |
1278 | ||
1279 | if (!hard_iface || !hard_iface->soft_iface) { | |
1280 | seq_puts(seq, "Interface not known to B.A.T.M.A.N.\n"); | |
1281 | goto out; | |
1282 | } | |
1283 | ||
1284 | bat_priv = netdev_priv(hard_iface->soft_iface); | |
1285 | if (!bat_priv->bat_algo_ops->bat_orig_print) { | |
1286 | seq_puts(seq, | |
1287 | "No printing function for this routing protocol\n"); | |
1288 | goto out; | |
1289 | } | |
1290 | ||
1291 | if (hard_iface->if_status != BATADV_IF_ACTIVE) { | |
1292 | seq_puts(seq, "Interface not active\n"); | |
1293 | goto out; | |
1294 | } | |
1295 | ||
1296 | seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n", | |
1297 | BATADV_SOURCE_VERSION, hard_iface->net_dev->name, | |
1298 | hard_iface->net_dev->dev_addr, | |
1299 | hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name); | |
1300 | ||
1301 | bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface); | |
1302 | ||
1303 | out: | |
16a41423 ML |
1304 | if (hard_iface) |
1305 | batadv_hardif_free_ref(hard_iface); | |
cb1c92ec SW |
1306 | return 0; |
1307 | } | |
1308 | ||
56303d34 SE |
1309 | int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface, |
1310 | int max_if_num) | |
c6c8fea2 | 1311 | { |
56303d34 | 1312 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
d0015fdd | 1313 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
5bf74e9c | 1314 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
c6c8fea2 | 1315 | struct hlist_head *head; |
56303d34 | 1316 | struct batadv_orig_node *orig_node; |
6b5e971a | 1317 | u32 i; |
c90681b8 | 1318 | int ret; |
c6c8fea2 SE |
1319 | |
1320 | /* resize all orig nodes because orig_node->bcast_own(_sum) depend on | |
9cfc7bd6 SE |
1321 | * if_num |
1322 | */ | |
c6c8fea2 SE |
1323 | for (i = 0; i < hash->size; i++) { |
1324 | head = &hash->table[i]; | |
1325 | ||
fb778ea1 | 1326 | rcu_read_lock(); |
b67bfe0d | 1327 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
d0015fdd AQ |
1328 | ret = 0; |
1329 | if (bao->bat_orig_add_if) | |
1330 | ret = bao->bat_orig_add_if(orig_node, | |
1331 | max_if_num); | |
5346c35e | 1332 | if (ret == -ENOMEM) |
c6c8fea2 SE |
1333 | goto err; |
1334 | } | |
fb778ea1 | 1335 | rcu_read_unlock(); |
c6c8fea2 SE |
1336 | } |
1337 | ||
c6c8fea2 SE |
1338 | return 0; |
1339 | ||
1340 | err: | |
fb778ea1 | 1341 | rcu_read_unlock(); |
c6c8fea2 SE |
1342 | return -ENOMEM; |
1343 | } | |
1344 | ||
56303d34 SE |
1345 | int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface, |
1346 | int max_if_num) | |
c6c8fea2 | 1347 | { |
56303d34 | 1348 | struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface); |
5bf74e9c | 1349 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
c6c8fea2 | 1350 | struct hlist_head *head; |
56303d34 SE |
1351 | struct batadv_hard_iface *hard_iface_tmp; |
1352 | struct batadv_orig_node *orig_node; | |
d0015fdd | 1353 | struct batadv_algo_ops *bao = bat_priv->bat_algo_ops; |
6b5e971a | 1354 | u32 i; |
c90681b8 | 1355 | int ret; |
c6c8fea2 SE |
1356 | |
1357 | /* resize all orig nodes because orig_node->bcast_own(_sum) depend on | |
9cfc7bd6 SE |
1358 | * if_num |
1359 | */ | |
c6c8fea2 SE |
1360 | for (i = 0; i < hash->size; i++) { |
1361 | head = &hash->table[i]; | |
1362 | ||
fb778ea1 | 1363 | rcu_read_lock(); |
b67bfe0d | 1364 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
d0015fdd AQ |
1365 | ret = 0; |
1366 | if (bao->bat_orig_del_if) | |
1367 | ret = bao->bat_orig_del_if(orig_node, | |
1368 | max_if_num, | |
1369 | hard_iface->if_num); | |
5346c35e | 1370 | if (ret == -ENOMEM) |
c6c8fea2 SE |
1371 | goto err; |
1372 | } | |
fb778ea1 | 1373 | rcu_read_unlock(); |
c6c8fea2 SE |
1374 | } |
1375 | ||
1376 | /* renumber remaining batman interfaces _inside_ of orig_hash_lock */ | |
1377 | rcu_read_lock(); | |
3193e8fd | 1378 | list_for_each_entry_rcu(hard_iface_tmp, &batadv_hardif_list, list) { |
e9a4f295 | 1379 | if (hard_iface_tmp->if_status == BATADV_IF_NOT_IN_USE) |
c6c8fea2 SE |
1380 | continue; |
1381 | ||
e6c10f43 | 1382 | if (hard_iface == hard_iface_tmp) |
c6c8fea2 SE |
1383 | continue; |
1384 | ||
e6c10f43 | 1385 | if (hard_iface->soft_iface != hard_iface_tmp->soft_iface) |
c6c8fea2 SE |
1386 | continue; |
1387 | ||
e6c10f43 ML |
1388 | if (hard_iface_tmp->if_num > hard_iface->if_num) |
1389 | hard_iface_tmp->if_num--; | |
c6c8fea2 SE |
1390 | } |
1391 | rcu_read_unlock(); | |
1392 | ||
e6c10f43 | 1393 | hard_iface->if_num = -1; |
c6c8fea2 SE |
1394 | return 0; |
1395 | ||
1396 | err: | |
fb778ea1 | 1397 | rcu_read_unlock(); |
c6c8fea2 SE |
1398 | return -ENOMEM; |
1399 | } |