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d353d8d4 MH |
1 | /* Copyright (C) 2012-2013 B.A.T.M.A.N. contributors: |
2 | * | |
3 | * Martin Hundebøll, Jeppe Ledet-Pedersen | |
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 | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA | |
17 | * 02110-1301, USA | |
18 | */ | |
19 | ||
d56b1705 MH |
20 | #include <linux/debugfs.h> |
21 | ||
d353d8d4 | 22 | #include "main.h" |
95332477 | 23 | #include "hash.h" |
d353d8d4 | 24 | #include "network-coding.h" |
95332477 | 25 | #include "send.h" |
d56b1705 MH |
26 | #include "originator.h" |
27 | #include "hard-interface.h" | |
d353d8d4 | 28 | |
95332477 | 29 | static struct lock_class_key batadv_nc_coding_hash_lock_class_key; |
612d2b4f | 30 | static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; |
95332477 | 31 | |
d353d8d4 MH |
32 | static void batadv_nc_worker(struct work_struct *work); |
33 | ||
34 | /** | |
35 | * batadv_nc_start_timer - initialise the nc periodic worker | |
36 | * @bat_priv: the bat priv with all the soft interface information | |
37 | */ | |
38 | static void batadv_nc_start_timer(struct batadv_priv *bat_priv) | |
39 | { | |
40 | queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work, | |
41 | msecs_to_jiffies(10)); | |
42 | } | |
43 | ||
44 | /** | |
45 | * batadv_nc_init - initialise coding hash table and start house keeping | |
46 | * @bat_priv: the bat priv with all the soft interface information | |
47 | */ | |
48 | int batadv_nc_init(struct batadv_priv *bat_priv) | |
49 | { | |
95332477 | 50 | bat_priv->nc.timestamp_fwd_flush = jiffies; |
612d2b4f | 51 | bat_priv->nc.timestamp_sniffed_purge = jiffies; |
95332477 | 52 | |
612d2b4f | 53 | if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) |
95332477 MH |
54 | return 0; |
55 | ||
56 | bat_priv->nc.coding_hash = batadv_hash_new(128); | |
57 | if (!bat_priv->nc.coding_hash) | |
58 | goto err; | |
59 | ||
60 | batadv_hash_set_lock_class(bat_priv->nc.coding_hash, | |
61 | &batadv_nc_coding_hash_lock_class_key); | |
62 | ||
612d2b4f MH |
63 | bat_priv->nc.decoding_hash = batadv_hash_new(128); |
64 | if (!bat_priv->nc.decoding_hash) | |
65 | goto err; | |
66 | ||
67 | batadv_hash_set_lock_class(bat_priv->nc.coding_hash, | |
68 | &batadv_nc_decoding_hash_lock_class_key); | |
69 | ||
d353d8d4 MH |
70 | INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); |
71 | batadv_nc_start_timer(bat_priv); | |
72 | ||
73 | return 0; | |
95332477 MH |
74 | |
75 | err: | |
76 | return -ENOMEM; | |
d353d8d4 MH |
77 | } |
78 | ||
79 | /** | |
80 | * batadv_nc_init_bat_priv - initialise the nc specific bat_priv variables | |
81 | * @bat_priv: the bat priv with all the soft interface information | |
82 | */ | |
83 | void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) | |
84 | { | |
85 | atomic_set(&bat_priv->network_coding, 1); | |
d56b1705 | 86 | bat_priv->nc.min_tq = 200; |
95332477 | 87 | bat_priv->nc.max_fwd_delay = 10; |
612d2b4f | 88 | bat_priv->nc.max_buffer_time = 200; |
d56b1705 MH |
89 | } |
90 | ||
91 | /** | |
92 | * batadv_nc_init_orig - initialise the nc fields of an orig_node | |
93 | * @orig_node: the orig_node which is going to be initialised | |
94 | */ | |
95 | void batadv_nc_init_orig(struct batadv_orig_node *orig_node) | |
96 | { | |
97 | INIT_LIST_HEAD(&orig_node->in_coding_list); | |
98 | INIT_LIST_HEAD(&orig_node->out_coding_list); | |
99 | spin_lock_init(&orig_node->in_coding_list_lock); | |
100 | spin_lock_init(&orig_node->out_coding_list_lock); | |
101 | } | |
102 | ||
103 | /** | |
104 | * batadv_nc_node_free_rcu - rcu callback to free an nc node and remove | |
105 | * its refcount on the orig_node | |
106 | * @rcu: rcu pointer of the nc node | |
107 | */ | |
108 | static void batadv_nc_node_free_rcu(struct rcu_head *rcu) | |
109 | { | |
110 | struct batadv_nc_node *nc_node; | |
111 | ||
112 | nc_node = container_of(rcu, struct batadv_nc_node, rcu); | |
113 | batadv_orig_node_free_ref(nc_node->orig_node); | |
114 | kfree(nc_node); | |
115 | } | |
116 | ||
117 | /** | |
118 | * batadv_nc_node_free_ref - decrements the nc node refcounter and possibly | |
119 | * frees it | |
120 | * @nc_node: the nc node to free | |
121 | */ | |
122 | static void batadv_nc_node_free_ref(struct batadv_nc_node *nc_node) | |
123 | { | |
124 | if (atomic_dec_and_test(&nc_node->refcount)) | |
125 | call_rcu(&nc_node->rcu, batadv_nc_node_free_rcu); | |
126 | } | |
127 | ||
95332477 MH |
128 | /** |
129 | * batadv_nc_path_free_ref - decrements the nc path refcounter and possibly | |
130 | * frees it | |
131 | * @nc_path: the nc node to free | |
132 | */ | |
133 | static void batadv_nc_path_free_ref(struct batadv_nc_path *nc_path) | |
134 | { | |
135 | if (atomic_dec_and_test(&nc_path->refcount)) | |
136 | kfree_rcu(nc_path, rcu); | |
137 | } | |
138 | ||
139 | /** | |
140 | * batadv_nc_packet_free - frees nc packet | |
141 | * @nc_packet: the nc packet to free | |
142 | */ | |
143 | static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet) | |
144 | { | |
145 | if (nc_packet->skb) | |
146 | kfree_skb(nc_packet->skb); | |
147 | ||
148 | batadv_nc_path_free_ref(nc_packet->nc_path); | |
149 | kfree(nc_packet); | |
150 | } | |
151 | ||
d56b1705 MH |
152 | /** |
153 | * batadv_nc_to_purge_nc_node - checks whether an nc node has to be purged | |
154 | * @bat_priv: the bat priv with all the soft interface information | |
155 | * @nc_node: the nc node to check | |
156 | * | |
157 | * Returns true if the entry has to be purged now, false otherwise | |
158 | */ | |
159 | static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, | |
160 | struct batadv_nc_node *nc_node) | |
161 | { | |
162 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
163 | return true; | |
164 | ||
165 | return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT); | |
166 | } | |
167 | ||
95332477 MH |
168 | /** |
169 | * batadv_nc_to_purge_nc_path_coding - checks whether an nc path has timed out | |
170 | * @bat_priv: the bat priv with all the soft interface information | |
171 | * @nc_path: the nc path to check | |
172 | * | |
173 | * Returns true if the entry has to be purged now, false otherwise | |
174 | */ | |
175 | static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, | |
176 | struct batadv_nc_path *nc_path) | |
177 | { | |
178 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
179 | return true; | |
180 | ||
181 | /* purge the path when no packets has been added for 10 times the | |
182 | * max_fwd_delay time | |
183 | */ | |
184 | return batadv_has_timed_out(nc_path->last_valid, | |
185 | bat_priv->nc.max_fwd_delay * 10); | |
186 | } | |
187 | ||
612d2b4f MH |
188 | /** |
189 | * batadv_nc_to_purge_nc_path_decoding - checks whether an nc path has timed out | |
190 | * @bat_priv: the bat priv with all the soft interface information | |
191 | * @nc_path: the nc path to check | |
192 | * | |
193 | * Returns true if the entry has to be purged now, false otherwise | |
194 | */ | |
195 | static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, | |
196 | struct batadv_nc_path *nc_path) | |
197 | { | |
198 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
199 | return true; | |
200 | ||
201 | /* purge the path when no packets has been added for 10 times the | |
202 | * max_buffer time | |
203 | */ | |
204 | return batadv_has_timed_out(nc_path->last_valid, | |
205 | bat_priv->nc.max_buffer_time*10); | |
206 | } | |
207 | ||
d56b1705 MH |
208 | /** |
209 | * batadv_nc_purge_orig_nc_nodes - go through list of nc nodes and purge stale | |
210 | * entries | |
211 | * @bat_priv: the bat priv with all the soft interface information | |
212 | * @list: list of nc nodes | |
213 | * @lock: nc node list lock | |
214 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
215 | * not. This function takes the nc node as argument and has to return | |
216 | * a boolean value: true if the entry has to be deleted, false | |
217 | * otherwise | |
218 | */ | |
219 | static void | |
220 | batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, | |
221 | struct list_head *list, | |
222 | spinlock_t *lock, | |
223 | bool (*to_purge)(struct batadv_priv *, | |
224 | struct batadv_nc_node *)) | |
225 | { | |
226 | struct batadv_nc_node *nc_node, *nc_node_tmp; | |
227 | ||
228 | /* For each nc_node in list */ | |
229 | spin_lock_bh(lock); | |
230 | list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) { | |
231 | /* if an helper function has been passed as parameter, | |
232 | * ask it if the entry has to be purged or not | |
233 | */ | |
234 | if (to_purge && !to_purge(bat_priv, nc_node)) | |
235 | continue; | |
236 | ||
237 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
238 | "Removing nc_node %pM -> %pM\n", | |
239 | nc_node->addr, nc_node->orig_node->orig); | |
240 | list_del_rcu(&nc_node->list); | |
241 | batadv_nc_node_free_ref(nc_node); | |
242 | } | |
243 | spin_unlock_bh(lock); | |
244 | } | |
245 | ||
246 | /** | |
247 | * batadv_nc_purge_orig - purges all nc node data attached of the given | |
248 | * originator | |
249 | * @bat_priv: the bat priv with all the soft interface information | |
250 | * @orig_node: orig_node with the nc node entries to be purged | |
251 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
252 | * not. This function takes the nc node as argument and has to return | |
253 | * a boolean value: true is the entry has to be deleted, false | |
254 | * otherwise | |
255 | */ | |
256 | void batadv_nc_purge_orig(struct batadv_priv *bat_priv, | |
257 | struct batadv_orig_node *orig_node, | |
258 | bool (*to_purge)(struct batadv_priv *, | |
259 | struct batadv_nc_node *)) | |
260 | { | |
261 | /* Check ingoing nc_node's of this orig_node */ | |
262 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list, | |
263 | &orig_node->in_coding_list_lock, | |
264 | to_purge); | |
265 | ||
266 | /* Check outgoing nc_node's of this orig_node */ | |
267 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list, | |
268 | &orig_node->out_coding_list_lock, | |
269 | to_purge); | |
270 | } | |
271 | ||
272 | /** | |
273 | * batadv_nc_purge_orig_hash - traverse entire originator hash to check if they | |
274 | * have timed out nc nodes | |
275 | * @bat_priv: the bat priv with all the soft interface information | |
276 | */ | |
277 | static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) | |
278 | { | |
279 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
280 | struct hlist_head *head; | |
281 | struct batadv_orig_node *orig_node; | |
282 | uint32_t i; | |
283 | ||
284 | if (!hash) | |
285 | return; | |
286 | ||
287 | /* For each orig_node */ | |
288 | for (i = 0; i < hash->size; i++) { | |
289 | head = &hash->table[i]; | |
290 | ||
291 | rcu_read_lock(); | |
292 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) | |
293 | batadv_nc_purge_orig(bat_priv, orig_node, | |
294 | batadv_nc_to_purge_nc_node); | |
295 | rcu_read_unlock(); | |
296 | } | |
d353d8d4 MH |
297 | } |
298 | ||
95332477 MH |
299 | /** |
300 | * batadv_nc_purge_paths - traverse all nc paths part of the hash and remove | |
301 | * unused ones | |
302 | * @bat_priv: the bat priv with all the soft interface information | |
303 | * @hash: hash table containing the nc paths to check | |
304 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
305 | * not. This function takes the nc node as argument and has to return | |
306 | * a boolean value: true is the entry has to be deleted, false | |
307 | * otherwise | |
308 | */ | |
309 | static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, | |
310 | struct batadv_hashtable *hash, | |
311 | bool (*to_purge)(struct batadv_priv *, | |
312 | struct batadv_nc_path *)) | |
313 | { | |
314 | struct hlist_head *head; | |
315 | struct hlist_node *node_tmp; | |
316 | struct batadv_nc_path *nc_path; | |
317 | spinlock_t *lock; /* Protects lists in hash */ | |
318 | uint32_t i; | |
319 | ||
320 | for (i = 0; i < hash->size; i++) { | |
321 | head = &hash->table[i]; | |
322 | lock = &hash->list_locks[i]; | |
323 | ||
324 | /* For each nc_path in this bin */ | |
325 | spin_lock_bh(lock); | |
326 | hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) { | |
327 | /* if an helper function has been passed as parameter, | |
328 | * ask it if the entry has to be purged or not | |
329 | */ | |
330 | if (to_purge && !to_purge(bat_priv, nc_path)) | |
331 | continue; | |
332 | ||
333 | /* purging an non-empty nc_path should never happen, but | |
334 | * is observed under high CPU load. Delay the purging | |
335 | * until next iteration to allow the packet_list to be | |
336 | * emptied first. | |
337 | */ | |
338 | if (!unlikely(list_empty(&nc_path->packet_list))) { | |
339 | net_ratelimited_function(printk, | |
340 | KERN_WARNING | |
341 | "Skipping free of non-empty nc_path (%pM -> %pM)!\n", | |
342 | nc_path->prev_hop, | |
343 | nc_path->next_hop); | |
344 | continue; | |
345 | } | |
346 | ||
347 | /* nc_path is unused, so remove it */ | |
348 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
349 | "Remove nc_path %pM -> %pM\n", | |
350 | nc_path->prev_hop, nc_path->next_hop); | |
351 | hlist_del_rcu(&nc_path->hash_entry); | |
352 | batadv_nc_path_free_ref(nc_path); | |
353 | } | |
354 | spin_unlock_bh(lock); | |
355 | } | |
356 | } | |
357 | ||
358 | /** | |
359 | * batadv_nc_hash_key_gen - computes the nc_path hash key | |
360 | * @key: buffer to hold the final hash key | |
361 | * @src: source ethernet mac address going into the hash key | |
362 | * @dst: destination ethernet mac address going into the hash key | |
363 | */ | |
364 | static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, | |
365 | const char *dst) | |
366 | { | |
367 | memcpy(key->prev_hop, src, sizeof(key->prev_hop)); | |
368 | memcpy(key->next_hop, dst, sizeof(key->next_hop)); | |
369 | } | |
370 | ||
371 | /** | |
372 | * batadv_nc_hash_choose - compute the hash value for an nc path | |
373 | * @data: data to hash | |
374 | * @size: size of the hash table | |
375 | * | |
376 | * Returns the selected index in the hash table for the given data. | |
377 | */ | |
378 | static uint32_t batadv_nc_hash_choose(const void *data, uint32_t size) | |
379 | { | |
380 | const struct batadv_nc_path *nc_path = data; | |
381 | uint32_t hash = 0; | |
382 | ||
383 | hash = batadv_hash_bytes(hash, &nc_path->prev_hop, | |
384 | sizeof(nc_path->prev_hop)); | |
385 | hash = batadv_hash_bytes(hash, &nc_path->next_hop, | |
386 | sizeof(nc_path->next_hop)); | |
387 | ||
388 | hash += (hash << 3); | |
389 | hash ^= (hash >> 11); | |
390 | hash += (hash << 15); | |
391 | ||
392 | return hash % size; | |
393 | } | |
394 | ||
395 | /** | |
396 | * batadv_nc_hash_compare - comparing function used in the network coding hash | |
397 | * tables | |
398 | * @node: node in the local table | |
399 | * @data2: second object to compare the node to | |
400 | * | |
401 | * Returns 1 if the two entry are the same, 0 otherwise | |
402 | */ | |
403 | static int batadv_nc_hash_compare(const struct hlist_node *node, | |
404 | const void *data2) | |
405 | { | |
406 | const struct batadv_nc_path *nc_path1, *nc_path2; | |
407 | ||
408 | nc_path1 = container_of(node, struct batadv_nc_path, hash_entry); | |
409 | nc_path2 = data2; | |
410 | ||
411 | /* Return 1 if the two keys are identical */ | |
412 | if (memcmp(nc_path1->prev_hop, nc_path2->prev_hop, | |
413 | sizeof(nc_path1->prev_hop)) != 0) | |
414 | return 0; | |
415 | ||
416 | if (memcmp(nc_path1->next_hop, nc_path2->next_hop, | |
417 | sizeof(nc_path1->next_hop)) != 0) | |
418 | return 0; | |
419 | ||
420 | return 1; | |
421 | } | |
422 | ||
423 | /** | |
424 | * batadv_nc_hash_find - search for an existing nc path and return it | |
425 | * @hash: hash table containing the nc path | |
426 | * @data: search key | |
427 | * | |
428 | * Returns the nc_path if found, NULL otherwise. | |
429 | */ | |
430 | static struct batadv_nc_path * | |
431 | batadv_nc_hash_find(struct batadv_hashtable *hash, | |
432 | void *data) | |
433 | { | |
434 | struct hlist_head *head; | |
435 | struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; | |
436 | int index; | |
437 | ||
438 | if (!hash) | |
439 | return NULL; | |
440 | ||
441 | index = batadv_nc_hash_choose(data, hash->size); | |
442 | head = &hash->table[index]; | |
443 | ||
444 | rcu_read_lock(); | |
445 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
446 | if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) | |
447 | continue; | |
448 | ||
449 | if (!atomic_inc_not_zero(&nc_path->refcount)) | |
450 | continue; | |
451 | ||
452 | nc_path_tmp = nc_path; | |
453 | break; | |
454 | } | |
455 | rcu_read_unlock(); | |
456 | ||
457 | return nc_path_tmp; | |
458 | } | |
459 | ||
460 | /** | |
461 | * batadv_nc_send_packet - send non-coded packet and free nc_packet struct | |
462 | * @nc_packet: the nc packet to send | |
463 | */ | |
464 | static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) | |
465 | { | |
466 | batadv_send_skb_packet(nc_packet->skb, | |
467 | nc_packet->neigh_node->if_incoming, | |
468 | nc_packet->nc_path->next_hop); | |
469 | nc_packet->skb = NULL; | |
470 | batadv_nc_packet_free(nc_packet); | |
471 | } | |
472 | ||
612d2b4f MH |
473 | /** |
474 | * batadv_nc_sniffed_purge - Checks timestamp of given sniffed nc_packet. | |
475 | * @bat_priv: the bat priv with all the soft interface information | |
476 | * @nc_path: the nc path the packet belongs to | |
477 | * @nc_packet: the nc packet to be checked | |
478 | * | |
479 | * Checks whether the given sniffed (overheard) nc_packet has hit its buffering | |
480 | * timeout. If so, the packet is no longer kept and the entry deleted from the | |
481 | * queue. Has to be called with the appropriate locks. | |
482 | * | |
483 | * Returns false as soon as the entry in the fifo queue has not been timed out | |
484 | * yet and true otherwise. | |
485 | */ | |
486 | static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, | |
487 | struct batadv_nc_path *nc_path, | |
488 | struct batadv_nc_packet *nc_packet) | |
489 | { | |
490 | unsigned long timeout = bat_priv->nc.max_buffer_time; | |
491 | bool res = false; | |
492 | ||
493 | /* Packets are added to tail, so the remaining packets did not time | |
494 | * out and we can stop processing the current queue | |
495 | */ | |
496 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
497 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
498 | goto out; | |
499 | ||
500 | /* purge nc packet */ | |
501 | list_del(&nc_packet->list); | |
502 | batadv_nc_packet_free(nc_packet); | |
503 | ||
504 | res = true; | |
505 | ||
506 | out: | |
507 | return res; | |
508 | } | |
509 | ||
95332477 MH |
510 | /** |
511 | * batadv_nc_fwd_flush - Checks the timestamp of the given nc packet. | |
512 | * @bat_priv: the bat priv with all the soft interface information | |
513 | * @nc_path: the nc path the packet belongs to | |
514 | * @nc_packet: the nc packet to be checked | |
515 | * | |
516 | * Checks whether the given nc packet has hit its forward timeout. If so, the | |
517 | * packet is no longer delayed, immediately sent and the entry deleted from the | |
518 | * queue. Has to be called with the appropriate locks. | |
519 | * | |
520 | * Returns false as soon as the entry in the fifo queue has not been timed out | |
521 | * yet and true otherwise. | |
522 | */ | |
523 | static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, | |
524 | struct batadv_nc_path *nc_path, | |
525 | struct batadv_nc_packet *nc_packet) | |
526 | { | |
527 | unsigned long timeout = bat_priv->nc.max_fwd_delay; | |
528 | ||
529 | /* Packets are added to tail, so the remaining packets did not time | |
530 | * out and we can stop processing the current queue | |
531 | */ | |
532 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
533 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
534 | return false; | |
535 | ||
536 | /* Send packet */ | |
537 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); | |
538 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
539 | nc_packet->skb->len + ETH_HLEN); | |
540 | list_del(&nc_packet->list); | |
541 | batadv_nc_send_packet(nc_packet); | |
542 | ||
543 | return true; | |
544 | } | |
545 | ||
546 | /** | |
547 | * batadv_nc_process_nc_paths - traverse given nc packet pool and free timed out | |
548 | * nc packets | |
549 | * @bat_priv: the bat priv with all the soft interface information | |
550 | * @hash: to be processed hash table | |
551 | * @process_fn: Function called to process given nc packet. Should return true | |
552 | * to encourage this function to proceed with the next packet. | |
553 | * Otherwise the rest of the current queue is skipped. | |
554 | */ | |
555 | static void | |
556 | batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, | |
557 | struct batadv_hashtable *hash, | |
558 | bool (*process_fn)(struct batadv_priv *, | |
559 | struct batadv_nc_path *, | |
560 | struct batadv_nc_packet *)) | |
561 | { | |
562 | struct hlist_head *head; | |
563 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
564 | struct batadv_nc_path *nc_path; | |
565 | bool ret; | |
566 | int i; | |
567 | ||
568 | if (!hash) | |
569 | return; | |
570 | ||
571 | /* Loop hash table bins */ | |
572 | for (i = 0; i < hash->size; i++) { | |
573 | head = &hash->table[i]; | |
574 | ||
575 | /* Loop coding paths */ | |
576 | rcu_read_lock(); | |
577 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
578 | /* Loop packets */ | |
579 | spin_lock_bh(&nc_path->packet_list_lock); | |
580 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
581 | &nc_path->packet_list, list) { | |
582 | ret = process_fn(bat_priv, nc_path, nc_packet); | |
583 | if (!ret) | |
584 | break; | |
585 | } | |
586 | spin_unlock_bh(&nc_path->packet_list_lock); | |
587 | } | |
588 | rcu_read_unlock(); | |
589 | } | |
590 | } | |
591 | ||
d353d8d4 MH |
592 | /** |
593 | * batadv_nc_worker - periodic task for house keeping related to network coding | |
594 | * @work: kernel work struct | |
595 | */ | |
596 | static void batadv_nc_worker(struct work_struct *work) | |
597 | { | |
598 | struct delayed_work *delayed_work; | |
599 | struct batadv_priv_nc *priv_nc; | |
600 | struct batadv_priv *bat_priv; | |
95332477 | 601 | unsigned long timeout; |
d353d8d4 MH |
602 | |
603 | delayed_work = container_of(work, struct delayed_work, work); | |
604 | priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); | |
605 | bat_priv = container_of(priv_nc, struct batadv_priv, nc); | |
606 | ||
d56b1705 | 607 | batadv_nc_purge_orig_hash(bat_priv); |
95332477 MH |
608 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, |
609 | batadv_nc_to_purge_nc_path_coding); | |
612d2b4f MH |
610 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, |
611 | batadv_nc_to_purge_nc_path_decoding); | |
95332477 MH |
612 | |
613 | timeout = bat_priv->nc.max_fwd_delay; | |
614 | ||
615 | if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { | |
616 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, | |
617 | batadv_nc_fwd_flush); | |
618 | bat_priv->nc.timestamp_fwd_flush = jiffies; | |
619 | } | |
d56b1705 | 620 | |
612d2b4f MH |
621 | if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, |
622 | bat_priv->nc.max_buffer_time)) { | |
623 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, | |
624 | batadv_nc_sniffed_purge); | |
625 | bat_priv->nc.timestamp_sniffed_purge = jiffies; | |
626 | } | |
627 | ||
d353d8d4 MH |
628 | /* Schedule a new check */ |
629 | batadv_nc_start_timer(bat_priv); | |
630 | } | |
631 | ||
d56b1705 MH |
632 | /** |
633 | * batadv_can_nc_with_orig - checks whether the given orig node is suitable for | |
634 | * coding or not | |
635 | * @bat_priv: the bat priv with all the soft interface information | |
636 | * @orig_node: neighboring orig node which may be used as nc candidate | |
637 | * @ogm_packet: incoming ogm packet also used for the checks | |
638 | * | |
639 | * Returns true if: | |
640 | * 1) The OGM must have the most recent sequence number. | |
641 | * 2) The TTL must be decremented by one and only one. | |
642 | * 3) The OGM must be received from the first hop from orig_node. | |
643 | * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. | |
644 | */ | |
645 | static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, | |
646 | struct batadv_orig_node *orig_node, | |
647 | struct batadv_ogm_packet *ogm_packet) | |
648 | { | |
649 | if (orig_node->last_real_seqno != ogm_packet->seqno) | |
650 | return false; | |
651 | if (orig_node->last_ttl != ogm_packet->header.ttl + 1) | |
652 | return false; | |
653 | if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) | |
654 | return false; | |
655 | if (ogm_packet->tq < bat_priv->nc.min_tq) | |
656 | return false; | |
657 | ||
658 | return true; | |
659 | } | |
660 | ||
661 | /** | |
662 | * batadv_nc_find_nc_node - search for an existing nc node and return it | |
663 | * @orig_node: orig node originating the ogm packet | |
664 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
665 | * (can be equal to orig_node) | |
666 | * @in_coding: traverse incoming or outgoing network coding list | |
667 | * | |
668 | * Returns the nc_node if found, NULL otherwise. | |
669 | */ | |
670 | static struct batadv_nc_node | |
671 | *batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, | |
672 | struct batadv_orig_node *orig_neigh_node, | |
673 | bool in_coding) | |
674 | { | |
675 | struct batadv_nc_node *nc_node, *nc_node_out = NULL; | |
676 | struct list_head *list; | |
677 | ||
678 | if (in_coding) | |
679 | list = &orig_neigh_node->in_coding_list; | |
680 | else | |
681 | list = &orig_neigh_node->out_coding_list; | |
682 | ||
683 | /* Traverse list of nc_nodes to orig_node */ | |
684 | rcu_read_lock(); | |
685 | list_for_each_entry_rcu(nc_node, list, list) { | |
686 | if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) | |
687 | continue; | |
688 | ||
689 | if (!atomic_inc_not_zero(&nc_node->refcount)) | |
690 | continue; | |
691 | ||
692 | /* Found a match */ | |
693 | nc_node_out = nc_node; | |
694 | break; | |
695 | } | |
696 | rcu_read_unlock(); | |
697 | ||
698 | return nc_node_out; | |
699 | } | |
700 | ||
701 | /** | |
702 | * batadv_nc_get_nc_node - retrieves an nc node or creates the entry if it was | |
703 | * not found | |
704 | * @bat_priv: the bat priv with all the soft interface information | |
705 | * @orig_node: orig node originating the ogm packet | |
706 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
707 | * (can be equal to orig_node) | |
708 | * @in_coding: traverse incoming or outgoing network coding list | |
709 | * | |
710 | * Returns the nc_node if found or created, NULL in case of an error. | |
711 | */ | |
712 | static struct batadv_nc_node | |
713 | *batadv_nc_get_nc_node(struct batadv_priv *bat_priv, | |
714 | struct batadv_orig_node *orig_node, | |
715 | struct batadv_orig_node *orig_neigh_node, | |
716 | bool in_coding) | |
717 | { | |
718 | struct batadv_nc_node *nc_node; | |
719 | spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ | |
720 | struct list_head *list; | |
721 | ||
722 | /* Check if nc_node is already added */ | |
723 | nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); | |
724 | ||
725 | /* Node found */ | |
726 | if (nc_node) | |
727 | return nc_node; | |
728 | ||
729 | nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); | |
730 | if (!nc_node) | |
731 | return NULL; | |
732 | ||
733 | if (!atomic_inc_not_zero(&orig_neigh_node->refcount)) | |
734 | goto free; | |
735 | ||
736 | /* Initialize nc_node */ | |
737 | INIT_LIST_HEAD(&nc_node->list); | |
738 | memcpy(nc_node->addr, orig_node->orig, ETH_ALEN); | |
739 | nc_node->orig_node = orig_neigh_node; | |
740 | atomic_set(&nc_node->refcount, 2); | |
741 | ||
742 | /* Select ingoing or outgoing coding node */ | |
743 | if (in_coding) { | |
744 | lock = &orig_neigh_node->in_coding_list_lock; | |
745 | list = &orig_neigh_node->in_coding_list; | |
746 | } else { | |
747 | lock = &orig_neigh_node->out_coding_list_lock; | |
748 | list = &orig_neigh_node->out_coding_list; | |
749 | } | |
750 | ||
751 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", | |
752 | nc_node->addr, nc_node->orig_node->orig); | |
753 | ||
754 | /* Add nc_node to orig_node */ | |
755 | spin_lock_bh(lock); | |
756 | list_add_tail_rcu(&nc_node->list, list); | |
757 | spin_unlock_bh(lock); | |
758 | ||
759 | return nc_node; | |
760 | ||
761 | free: | |
762 | kfree(nc_node); | |
763 | return NULL; | |
764 | } | |
765 | ||
766 | /** | |
767 | * batadv_nc_update_nc_node - updates stored incoming and outgoing nc node structs | |
768 | * (best called on incoming OGMs) | |
769 | * @bat_priv: the bat priv with all the soft interface information | |
770 | * @orig_node: orig node originating the ogm packet | |
771 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
772 | * (can be equal to orig_node) | |
773 | * @ogm_packet: incoming ogm packet | |
774 | * @is_single_hop_neigh: orig_node is a single hop neighbor | |
775 | */ | |
776 | void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, | |
777 | struct batadv_orig_node *orig_node, | |
778 | struct batadv_orig_node *orig_neigh_node, | |
779 | struct batadv_ogm_packet *ogm_packet, | |
780 | int is_single_hop_neigh) | |
781 | { | |
782 | struct batadv_nc_node *in_nc_node = NULL, *out_nc_node = NULL; | |
783 | ||
784 | /* Check if network coding is enabled */ | |
785 | if (!atomic_read(&bat_priv->network_coding)) | |
786 | goto out; | |
787 | ||
788 | /* accept ogms from 'good' neighbors and single hop neighbors */ | |
789 | if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && | |
790 | !is_single_hop_neigh) | |
791 | goto out; | |
792 | ||
793 | /* Add orig_node as in_nc_node on hop */ | |
794 | in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, | |
795 | orig_neigh_node, true); | |
796 | if (!in_nc_node) | |
797 | goto out; | |
798 | ||
799 | in_nc_node->last_seen = jiffies; | |
800 | ||
801 | /* Add hop as out_nc_node on orig_node */ | |
802 | out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, | |
803 | orig_node, false); | |
804 | if (!out_nc_node) | |
805 | goto out; | |
806 | ||
807 | out_nc_node->last_seen = jiffies; | |
808 | ||
809 | out: | |
810 | if (in_nc_node) | |
811 | batadv_nc_node_free_ref(in_nc_node); | |
812 | if (out_nc_node) | |
813 | batadv_nc_node_free_ref(out_nc_node); | |
814 | } | |
815 | ||
95332477 MH |
816 | /** |
817 | * batadv_nc_get_path - get existing nc_path or allocate a new one | |
818 | * @bat_priv: the bat priv with all the soft interface information | |
819 | * @hash: hash table containing the nc path | |
820 | * @src: ethernet source address - first half of the nc path search key | |
821 | * @dst: ethernet destination address - second half of the nc path search key | |
822 | * | |
823 | * Returns pointer to nc_path if the path was found or created, returns NULL | |
824 | * on error. | |
825 | */ | |
826 | static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, | |
827 | struct batadv_hashtable *hash, | |
828 | uint8_t *src, | |
829 | uint8_t *dst) | |
830 | { | |
831 | int hash_added; | |
832 | struct batadv_nc_path *nc_path, nc_path_key; | |
833 | ||
834 | batadv_nc_hash_key_gen(&nc_path_key, src, dst); | |
835 | ||
836 | /* Search for existing nc_path */ | |
837 | nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); | |
838 | ||
839 | if (nc_path) { | |
840 | /* Set timestamp to delay removal of nc_path */ | |
841 | nc_path->last_valid = jiffies; | |
842 | return nc_path; | |
843 | } | |
844 | ||
845 | /* No existing nc_path was found; create a new */ | |
846 | nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); | |
847 | ||
848 | if (!nc_path) | |
849 | return NULL; | |
850 | ||
851 | /* Initialize nc_path */ | |
852 | INIT_LIST_HEAD(&nc_path->packet_list); | |
853 | spin_lock_init(&nc_path->packet_list_lock); | |
854 | atomic_set(&nc_path->refcount, 2); | |
855 | nc_path->last_valid = jiffies; | |
856 | memcpy(nc_path->next_hop, dst, ETH_ALEN); | |
857 | memcpy(nc_path->prev_hop, src, ETH_ALEN); | |
858 | ||
859 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", | |
860 | nc_path->prev_hop, | |
861 | nc_path->next_hop); | |
862 | ||
863 | /* Add nc_path to hash table */ | |
864 | hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, | |
865 | batadv_nc_hash_choose, &nc_path_key, | |
866 | &nc_path->hash_entry); | |
867 | ||
868 | if (hash_added < 0) { | |
869 | kfree(nc_path); | |
870 | return NULL; | |
871 | } | |
872 | ||
873 | return nc_path; | |
874 | } | |
875 | ||
3c12de9a MH |
876 | /** |
877 | * batadv_nc_random_weight_tq - scale the receivers TQ-value to avoid unfair | |
878 | * selection of a receiver with slightly lower TQ than the other | |
879 | * @tq: to be weighted tq value | |
880 | */ | |
881 | static uint8_t batadv_nc_random_weight_tq(uint8_t tq) | |
882 | { | |
883 | uint8_t rand_val, rand_tq; | |
884 | ||
885 | get_random_bytes(&rand_val, sizeof(rand_val)); | |
886 | ||
887 | /* randomize the estimated packet loss (max TQ - estimated TQ) */ | |
888 | rand_tq = rand_val * (BATADV_TQ_MAX_VALUE - tq); | |
889 | ||
890 | /* normalize the randomized packet loss */ | |
891 | rand_tq /= BATADV_TQ_MAX_VALUE; | |
892 | ||
893 | /* convert to (randomized) estimated tq again */ | |
894 | return BATADV_TQ_MAX_VALUE - rand_tq; | |
895 | } | |
896 | ||
897 | /** | |
898 | * batadv_nc_memxor - XOR destination with source | |
899 | * @dst: byte array to XOR into | |
900 | * @src: byte array to XOR from | |
901 | * @len: length of destination array | |
902 | */ | |
903 | static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) | |
904 | { | |
905 | unsigned int i; | |
906 | ||
907 | for (i = 0; i < len; ++i) | |
908 | dst[i] ^= src[i]; | |
909 | } | |
910 | ||
911 | /** | |
912 | * batadv_nc_code_packets - code a received unicast_packet with an nc packet | |
913 | * into a coded_packet and send it | |
914 | * @bat_priv: the bat priv with all the soft interface information | |
915 | * @skb: data skb to forward | |
916 | * @ethhdr: pointer to the ethernet header inside the skb | |
917 | * @nc_packet: structure containing the packet to the skb can be coded with | |
918 | * @neigh_node: next hop to forward packet to | |
919 | * | |
920 | * Returns true if both packets are consumed, false otherwise. | |
921 | */ | |
922 | static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, | |
923 | struct sk_buff *skb, | |
924 | struct ethhdr *ethhdr, | |
925 | struct batadv_nc_packet *nc_packet, | |
926 | struct batadv_neigh_node *neigh_node) | |
927 | { | |
928 | uint8_t tq_weighted_neigh, tq_weighted_coding; | |
929 | struct sk_buff *skb_dest, *skb_src; | |
930 | struct batadv_unicast_packet *packet1; | |
931 | struct batadv_unicast_packet *packet2; | |
932 | struct batadv_coded_packet *coded_packet; | |
933 | struct batadv_neigh_node *neigh_tmp, *router_neigh; | |
934 | struct batadv_neigh_node *router_coding = NULL; | |
935 | uint8_t *first_source, *first_dest, *second_source, *second_dest; | |
936 | __be32 packet_id1, packet_id2; | |
937 | size_t count; | |
938 | bool res = false; | |
939 | int coding_len; | |
940 | int unicast_size = sizeof(*packet1); | |
941 | int coded_size = sizeof(*coded_packet); | |
942 | int header_add = coded_size - unicast_size; | |
943 | ||
944 | router_neigh = batadv_orig_node_get_router(neigh_node->orig_node); | |
945 | if (!router_neigh) | |
946 | goto out; | |
947 | ||
948 | neigh_tmp = nc_packet->neigh_node; | |
949 | router_coding = batadv_orig_node_get_router(neigh_tmp->orig_node); | |
950 | if (!router_coding) | |
951 | goto out; | |
952 | ||
953 | tq_weighted_neigh = batadv_nc_random_weight_tq(router_neigh->tq_avg); | |
954 | tq_weighted_coding = batadv_nc_random_weight_tq(router_coding->tq_avg); | |
955 | ||
956 | /* Select one destination for the MAC-header dst-field based on | |
957 | * weighted TQ-values. | |
958 | */ | |
959 | if (tq_weighted_neigh >= tq_weighted_coding) { | |
960 | /* Destination from nc_packet is selected for MAC-header */ | |
961 | first_dest = nc_packet->nc_path->next_hop; | |
962 | first_source = nc_packet->nc_path->prev_hop; | |
963 | second_dest = neigh_node->addr; | |
964 | second_source = ethhdr->h_source; | |
965 | packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
966 | packet2 = (struct batadv_unicast_packet *)skb->data; | |
967 | packet_id1 = nc_packet->packet_id; | |
968 | packet_id2 = batadv_skb_crc32(skb, | |
969 | skb->data + sizeof(*packet2)); | |
970 | } else { | |
971 | /* Destination for skb is selected for MAC-header */ | |
972 | first_dest = neigh_node->addr; | |
973 | first_source = ethhdr->h_source; | |
974 | second_dest = nc_packet->nc_path->next_hop; | |
975 | second_source = nc_packet->nc_path->prev_hop; | |
976 | packet1 = (struct batadv_unicast_packet *)skb->data; | |
977 | packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
978 | packet_id1 = batadv_skb_crc32(skb, | |
979 | skb->data + sizeof(*packet1)); | |
980 | packet_id2 = nc_packet->packet_id; | |
981 | } | |
982 | ||
983 | /* Instead of zero padding the smallest data buffer, we | |
984 | * code into the largest. | |
985 | */ | |
986 | if (skb->len <= nc_packet->skb->len) { | |
987 | skb_dest = nc_packet->skb; | |
988 | skb_src = skb; | |
989 | } else { | |
990 | skb_dest = skb; | |
991 | skb_src = nc_packet->skb; | |
992 | } | |
993 | ||
994 | /* coding_len is used when decoding the packet shorter packet */ | |
995 | coding_len = skb_src->len - unicast_size; | |
996 | ||
997 | if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) | |
998 | goto out; | |
999 | ||
1000 | skb_push(skb_dest, header_add); | |
1001 | ||
1002 | coded_packet = (struct batadv_coded_packet *)skb_dest->data; | |
1003 | skb_reset_mac_header(skb_dest); | |
1004 | ||
1005 | coded_packet->header.packet_type = BATADV_CODED; | |
1006 | coded_packet->header.version = BATADV_COMPAT_VERSION; | |
1007 | coded_packet->header.ttl = packet1->header.ttl; | |
1008 | ||
1009 | /* Info about first unicast packet */ | |
1010 | memcpy(coded_packet->first_source, first_source, ETH_ALEN); | |
1011 | memcpy(coded_packet->first_orig_dest, packet1->dest, ETH_ALEN); | |
1012 | coded_packet->first_crc = packet_id1; | |
1013 | coded_packet->first_ttvn = packet1->ttvn; | |
1014 | ||
1015 | /* Info about second unicast packet */ | |
1016 | memcpy(coded_packet->second_dest, second_dest, ETH_ALEN); | |
1017 | memcpy(coded_packet->second_source, second_source, ETH_ALEN); | |
1018 | memcpy(coded_packet->second_orig_dest, packet2->dest, ETH_ALEN); | |
1019 | coded_packet->second_crc = packet_id2; | |
1020 | coded_packet->second_ttl = packet2->header.ttl; | |
1021 | coded_packet->second_ttvn = packet2->ttvn; | |
1022 | coded_packet->coded_len = htons(coding_len); | |
1023 | ||
1024 | /* This is where the magic happens: Code skb_src into skb_dest */ | |
1025 | batadv_nc_memxor(skb_dest->data + coded_size, | |
1026 | skb_src->data + unicast_size, coding_len); | |
1027 | ||
1028 | /* Update counters accordingly */ | |
1029 | if (BATADV_SKB_CB(skb_src)->decoded && | |
1030 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1031 | /* Both packets are recoded */ | |
1032 | count = skb_src->len + ETH_HLEN; | |
1033 | count += skb_dest->len + ETH_HLEN; | |
1034 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); | |
1035 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); | |
1036 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1037 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1038 | /* Both packets are newly coded */ | |
1039 | count = skb_src->len + ETH_HLEN; | |
1040 | count += skb_dest->len + ETH_HLEN; | |
1041 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); | |
1042 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); | |
1043 | } else if (BATADV_SKB_CB(skb_src)->decoded && | |
1044 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1045 | /* skb_src recoded and skb_dest is newly coded */ | |
1046 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1047 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1048 | skb_src->len + ETH_HLEN); | |
1049 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1050 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1051 | skb_dest->len + ETH_HLEN); | |
1052 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1053 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1054 | /* skb_src is newly coded and skb_dest is recoded */ | |
1055 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1056 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1057 | skb_src->len + ETH_HLEN); | |
1058 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1059 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1060 | skb_dest->len + ETH_HLEN); | |
1061 | } | |
1062 | ||
1063 | /* skb_src is now coded into skb_dest, so free it */ | |
1064 | kfree_skb(skb_src); | |
1065 | ||
1066 | /* avoid duplicate free of skb from nc_packet */ | |
1067 | nc_packet->skb = NULL; | |
1068 | batadv_nc_packet_free(nc_packet); | |
1069 | ||
1070 | /* Send the coded packet and return true */ | |
1071 | batadv_send_skb_packet(skb_dest, neigh_node->if_incoming, first_dest); | |
1072 | res = true; | |
1073 | out: | |
1074 | if (router_neigh) | |
1075 | batadv_neigh_node_free_ref(router_neigh); | |
1076 | if (router_coding) | |
1077 | batadv_neigh_node_free_ref(router_coding); | |
1078 | return res; | |
1079 | } | |
1080 | ||
1081 | /** | |
1082 | * batadv_nc_skb_coding_possible - true if a decoded skb is available at dst. | |
1083 | * @skb: data skb to forward | |
1084 | * @dst: destination mac address of the other skb to code with | |
1085 | * @src: source mac address of skb | |
1086 | * | |
1087 | * Whenever we network code a packet we have to check whether we received it in | |
1088 | * a network coded form. If so, we may not be able to use it for coding because | |
1089 | * some neighbors may also have received (overheard) the packet in the network | |
1090 | * coded form without being able to decode it. It is hard to know which of the | |
1091 | * neighboring nodes was able to decode the packet, therefore we can only | |
1092 | * re-code the packet if the source of the previous encoded packet is involved. | |
1093 | * Since the source encoded the packet we can be certain it has all necessary | |
1094 | * decode information. | |
1095 | * | |
1096 | * Returns true if coding of a decoded packet is allowed. | |
1097 | */ | |
1098 | static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, | |
1099 | uint8_t *dst, uint8_t *src) | |
1100 | { | |
1101 | if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) | |
1102 | return false; | |
1103 | else | |
1104 | return true; | |
1105 | } | |
1106 | ||
1107 | /** | |
1108 | * batadv_nc_path_search - Find the coding path matching in_nc_node and | |
1109 | * out_nc_node to retrieve a buffered packet that can be used for coding. | |
1110 | * @bat_priv: the bat priv with all the soft interface information | |
1111 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1112 | * @out_nc_node: pointer to skb source's neighbor nc node | |
1113 | * @skb: data skb to forward | |
1114 | * @eth_dst: next hop mac address of skb | |
1115 | * | |
1116 | * Returns true if coding of a decoded skb is allowed. | |
1117 | */ | |
1118 | static struct batadv_nc_packet * | |
1119 | batadv_nc_path_search(struct batadv_priv *bat_priv, | |
1120 | struct batadv_nc_node *in_nc_node, | |
1121 | struct batadv_nc_node *out_nc_node, | |
1122 | struct sk_buff *skb, | |
1123 | uint8_t *eth_dst) | |
1124 | { | |
1125 | struct batadv_nc_path *nc_path, nc_path_key; | |
1126 | struct batadv_nc_packet *nc_packet_out = NULL; | |
1127 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
1128 | struct batadv_hashtable *hash = bat_priv->nc.coding_hash; | |
1129 | int idx; | |
1130 | ||
1131 | if (!hash) | |
1132 | return NULL; | |
1133 | ||
1134 | /* Create almost path key */ | |
1135 | batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, | |
1136 | out_nc_node->addr); | |
1137 | idx = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1138 | ||
1139 | /* Check for coding opportunities in this nc_path */ | |
1140 | rcu_read_lock(); | |
1141 | hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { | |
1142 | if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) | |
1143 | continue; | |
1144 | ||
1145 | if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) | |
1146 | continue; | |
1147 | ||
1148 | spin_lock_bh(&nc_path->packet_list_lock); | |
1149 | if (list_empty(&nc_path->packet_list)) { | |
1150 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1151 | continue; | |
1152 | } | |
1153 | ||
1154 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
1155 | &nc_path->packet_list, list) { | |
1156 | if (!batadv_nc_skb_coding_possible(nc_packet->skb, | |
1157 | eth_dst, | |
1158 | in_nc_node->addr)) | |
1159 | continue; | |
1160 | ||
1161 | /* Coding opportunity is found! */ | |
1162 | list_del(&nc_packet->list); | |
1163 | nc_packet_out = nc_packet; | |
1164 | break; | |
1165 | } | |
1166 | ||
1167 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1168 | break; | |
1169 | } | |
1170 | rcu_read_unlock(); | |
1171 | ||
1172 | return nc_packet_out; | |
1173 | } | |
1174 | ||
1175 | /** | |
1176 | * batadv_nc_skb_src_search - Loops through the list of neighoring nodes of the | |
1177 | * skb's sender (may be equal to the originator). | |
1178 | * @bat_priv: the bat priv with all the soft interface information | |
1179 | * @skb: data skb to forward | |
1180 | * @eth_dst: next hop mac address of skb | |
1181 | * @eth_src: source mac address of skb | |
1182 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1183 | * | |
1184 | * Returns an nc packet if a suitable coding packet was found, NULL otherwise. | |
1185 | */ | |
1186 | static struct batadv_nc_packet * | |
1187 | batadv_nc_skb_src_search(struct batadv_priv *bat_priv, | |
1188 | struct sk_buff *skb, | |
1189 | uint8_t *eth_dst, | |
1190 | uint8_t *eth_src, | |
1191 | struct batadv_nc_node *in_nc_node) | |
1192 | { | |
1193 | struct batadv_orig_node *orig_node; | |
1194 | struct batadv_nc_node *out_nc_node; | |
1195 | struct batadv_nc_packet *nc_packet = NULL; | |
1196 | ||
1197 | orig_node = batadv_orig_hash_find(bat_priv, eth_src); | |
1198 | if (!orig_node) | |
1199 | return NULL; | |
1200 | ||
1201 | rcu_read_lock(); | |
1202 | list_for_each_entry_rcu(out_nc_node, | |
1203 | &orig_node->out_coding_list, list) { | |
1204 | /* Check if the skb is decoded and if recoding is possible */ | |
1205 | if (!batadv_nc_skb_coding_possible(skb, | |
1206 | out_nc_node->addr, eth_src)) | |
1207 | continue; | |
1208 | ||
1209 | /* Search for an opportunity in this nc_path */ | |
1210 | nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, | |
1211 | out_nc_node, skb, eth_dst); | |
1212 | if (nc_packet) | |
1213 | break; | |
1214 | } | |
1215 | rcu_read_unlock(); | |
1216 | ||
1217 | batadv_orig_node_free_ref(orig_node); | |
1218 | return nc_packet; | |
1219 | } | |
1220 | ||
612d2b4f MH |
1221 | /** |
1222 | * batadv_nc_skb_store_before_coding - set the ethernet src and dst of the | |
1223 | * unicast skb before it is stored for use in later decoding | |
1224 | * @bat_priv: the bat priv with all the soft interface information | |
1225 | * @skb: data skb to store | |
1226 | * @eth_dst_new: new destination mac address of skb | |
1227 | */ | |
1228 | static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, | |
1229 | struct sk_buff *skb, | |
1230 | uint8_t *eth_dst_new) | |
1231 | { | |
1232 | struct ethhdr *ethhdr; | |
1233 | ||
1234 | /* Copy skb header to change the mac header */ | |
1235 | skb = pskb_copy(skb, GFP_ATOMIC); | |
1236 | if (!skb) | |
1237 | return; | |
1238 | ||
1239 | /* Set the mac header as if we actually sent the packet uncoded */ | |
1240 | ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1241 | memcpy(ethhdr->h_source, ethhdr->h_dest, ETH_ALEN); | |
1242 | memcpy(ethhdr->h_dest, eth_dst_new, ETH_ALEN); | |
1243 | ||
1244 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1245 | skb_push(skb, ETH_HLEN); | |
1246 | ||
1247 | /* Add the packet to the decoding packet pool */ | |
1248 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1249 | ||
1250 | /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free | |
1251 | * our ref | |
1252 | */ | |
1253 | kfree_skb(skb); | |
1254 | } | |
1255 | ||
3c12de9a MH |
1256 | /** |
1257 | * batadv_nc_skb_dst_search - Loops through list of neighboring nodes to dst. | |
1258 | * @skb: data skb to forward | |
1259 | * @neigh_node: next hop to forward packet to | |
1260 | * @ethhdr: pointer to the ethernet header inside the skb | |
1261 | * | |
1262 | * Loops through list of neighboring nodes the next hop has a good connection to | |
1263 | * (receives OGMs with a sufficient quality). We need to find a neighbor of our | |
1264 | * next hop that potentially sent a packet which our next hop also received | |
1265 | * (overheard) and has stored for later decoding. | |
1266 | * | |
1267 | * Returns true if the skb was consumed (encoded packet sent) or false otherwise | |
1268 | */ | |
1269 | static bool batadv_nc_skb_dst_search(struct sk_buff *skb, | |
1270 | struct batadv_neigh_node *neigh_node, | |
1271 | struct ethhdr *ethhdr) | |
1272 | { | |
1273 | struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1274 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1275 | struct batadv_orig_node *orig_node = neigh_node->orig_node; | |
1276 | struct batadv_nc_node *nc_node; | |
1277 | struct batadv_nc_packet *nc_packet = NULL; | |
1278 | ||
1279 | rcu_read_lock(); | |
1280 | list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { | |
1281 | /* Search for coding opportunity with this in_nc_node */ | |
1282 | nc_packet = batadv_nc_skb_src_search(bat_priv, skb, | |
1283 | neigh_node->addr, | |
1284 | ethhdr->h_source, nc_node); | |
1285 | ||
1286 | /* Opportunity was found, so stop searching */ | |
1287 | if (nc_packet) | |
1288 | break; | |
1289 | } | |
1290 | rcu_read_unlock(); | |
1291 | ||
1292 | if (!nc_packet) | |
1293 | return false; | |
1294 | ||
612d2b4f MH |
1295 | /* Save packets for later decoding */ |
1296 | batadv_nc_skb_store_before_coding(bat_priv, skb, | |
1297 | neigh_node->addr); | |
1298 | batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, | |
1299 | nc_packet->neigh_node->addr); | |
1300 | ||
3c12de9a MH |
1301 | /* Code and send packets */ |
1302 | if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, | |
1303 | neigh_node)) | |
1304 | return true; | |
1305 | ||
1306 | /* out of mem ? Coding failed - we have to free the buffered packet | |
1307 | * to avoid memleaks. The skb passed as argument will be dealt with | |
1308 | * by the calling function. | |
1309 | */ | |
1310 | batadv_nc_send_packet(nc_packet); | |
1311 | return false; | |
1312 | } | |
1313 | ||
95332477 MH |
1314 | /** |
1315 | * batadv_nc_skb_add_to_path - buffer skb for later encoding / decoding | |
1316 | * @skb: skb to add to path | |
1317 | * @nc_path: path to add skb to | |
1318 | * @neigh_node: next hop to forward packet to | |
1319 | * @packet_id: checksum to identify packet | |
1320 | * | |
1321 | * Returns true if the packet was buffered or false in case of an error. | |
1322 | */ | |
1323 | static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, | |
1324 | struct batadv_nc_path *nc_path, | |
1325 | struct batadv_neigh_node *neigh_node, | |
1326 | __be32 packet_id) | |
1327 | { | |
1328 | struct batadv_nc_packet *nc_packet; | |
1329 | ||
1330 | nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); | |
1331 | if (!nc_packet) | |
1332 | return false; | |
1333 | ||
1334 | /* Initialize nc_packet */ | |
1335 | nc_packet->timestamp = jiffies; | |
1336 | nc_packet->packet_id = packet_id; | |
1337 | nc_packet->skb = skb; | |
1338 | nc_packet->neigh_node = neigh_node; | |
1339 | nc_packet->nc_path = nc_path; | |
1340 | ||
1341 | /* Add coding packet to list */ | |
1342 | spin_lock_bh(&nc_path->packet_list_lock); | |
1343 | list_add_tail(&nc_packet->list, &nc_path->packet_list); | |
1344 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1345 | ||
1346 | return true; | |
1347 | } | |
1348 | ||
1349 | /** | |
1350 | * batadv_nc_skb_forward - try to code a packet or add it to the coding packet | |
1351 | * buffer | |
1352 | * @skb: data skb to forward | |
1353 | * @neigh_node: next hop to forward packet to | |
1354 | * @ethhdr: pointer to the ethernet header inside the skb | |
1355 | * | |
1356 | * Returns true if the skb was consumed (encoded packet sent) or false otherwise | |
1357 | */ | |
1358 | bool batadv_nc_skb_forward(struct sk_buff *skb, | |
1359 | struct batadv_neigh_node *neigh_node, | |
1360 | struct ethhdr *ethhdr) | |
1361 | { | |
1362 | const struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1363 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1364 | struct batadv_unicast_packet *packet; | |
1365 | struct batadv_nc_path *nc_path; | |
1366 | __be32 packet_id; | |
1367 | u8 *payload; | |
1368 | ||
1369 | /* Check if network coding is enabled */ | |
1370 | if (!atomic_read(&bat_priv->network_coding)) | |
1371 | goto out; | |
1372 | ||
1373 | /* We only handle unicast packets */ | |
1374 | payload = skb_network_header(skb); | |
1375 | packet = (struct batadv_unicast_packet *)payload; | |
1376 | if (packet->header.packet_type != BATADV_UNICAST) | |
1377 | goto out; | |
1378 | ||
3c12de9a MH |
1379 | /* Try to find a coding opportunity and send the skb if one is found */ |
1380 | if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) | |
1381 | return true; | |
1382 | ||
95332477 MH |
1383 | /* Find or create a nc_path for this src-dst pair */ |
1384 | nc_path = batadv_nc_get_path(bat_priv, | |
1385 | bat_priv->nc.coding_hash, | |
1386 | ethhdr->h_source, | |
1387 | neigh_node->addr); | |
1388 | ||
1389 | if (!nc_path) | |
1390 | goto out; | |
1391 | ||
1392 | /* Add skb to nc_path */ | |
1393 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1394 | if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) | |
1395 | goto free_nc_path; | |
1396 | ||
1397 | /* Packet is consumed */ | |
1398 | return true; | |
1399 | ||
1400 | free_nc_path: | |
1401 | batadv_nc_path_free_ref(nc_path); | |
1402 | out: | |
1403 | /* Packet is not consumed */ | |
1404 | return false; | |
1405 | } | |
1406 | ||
612d2b4f MH |
1407 | /** |
1408 | * batadv_nc_skb_store_for_decoding - save a clone of the skb which can be used | |
1409 | * when decoding coded packets | |
1410 | * @bat_priv: the bat priv with all the soft interface information | |
1411 | * @skb: data skb to store | |
1412 | */ | |
1413 | void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, | |
1414 | struct sk_buff *skb) | |
1415 | { | |
1416 | struct batadv_unicast_packet *packet; | |
1417 | struct batadv_nc_path *nc_path; | |
1418 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1419 | __be32 packet_id; | |
1420 | u8 *payload; | |
1421 | ||
1422 | /* Check if network coding is enabled */ | |
1423 | if (!atomic_read(&bat_priv->network_coding)) | |
1424 | goto out; | |
1425 | ||
1426 | /* Check for supported packet type */ | |
1427 | payload = skb_network_header(skb); | |
1428 | packet = (struct batadv_unicast_packet *)payload; | |
1429 | if (packet->header.packet_type != BATADV_UNICAST) | |
1430 | goto out; | |
1431 | ||
1432 | /* Find existing nc_path or create a new */ | |
1433 | nc_path = batadv_nc_get_path(bat_priv, | |
1434 | bat_priv->nc.decoding_hash, | |
1435 | ethhdr->h_source, | |
1436 | ethhdr->h_dest); | |
1437 | ||
1438 | if (!nc_path) | |
1439 | goto out; | |
1440 | ||
1441 | /* Clone skb and adjust skb->data to point at batman header */ | |
1442 | skb = skb_clone(skb, GFP_ATOMIC); | |
1443 | if (unlikely(!skb)) | |
1444 | goto free_nc_path; | |
1445 | ||
1446 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) | |
1447 | goto free_skb; | |
1448 | ||
1449 | if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) | |
1450 | goto free_skb; | |
1451 | ||
1452 | /* Add skb to nc_path */ | |
1453 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1454 | if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) | |
1455 | goto free_skb; | |
1456 | ||
1457 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); | |
1458 | return; | |
1459 | ||
1460 | free_skb: | |
1461 | kfree_skb(skb); | |
1462 | free_nc_path: | |
1463 | batadv_nc_path_free_ref(nc_path); | |
1464 | out: | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | /** | |
1469 | * batadv_nc_skb_store_sniffed_unicast - check if a received unicast packet | |
1470 | * should be saved in the decoding buffer and, if so, store it there | |
1471 | * @bat_priv: the bat priv with all the soft interface information | |
1472 | * @skb: unicast skb to store | |
1473 | */ | |
1474 | void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, | |
1475 | struct sk_buff *skb) | |
1476 | { | |
1477 | struct ethhdr *ethhdr = (struct ethhdr *)skb_mac_header(skb); | |
1478 | ||
1479 | if (batadv_is_my_mac(ethhdr->h_dest)) | |
1480 | return; | |
1481 | ||
1482 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1483 | skb_push(skb, ETH_HLEN); | |
1484 | ||
1485 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1486 | } | |
1487 | ||
d353d8d4 MH |
1488 | /** |
1489 | * batadv_nc_free - clean up network coding memory | |
1490 | * @bat_priv: the bat priv with all the soft interface information | |
1491 | */ | |
1492 | void batadv_nc_free(struct batadv_priv *bat_priv) | |
1493 | { | |
1494 | cancel_delayed_work_sync(&bat_priv->nc.work); | |
612d2b4f | 1495 | |
95332477 MH |
1496 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); |
1497 | batadv_hash_destroy(bat_priv->nc.coding_hash); | |
612d2b4f MH |
1498 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); |
1499 | batadv_hash_destroy(bat_priv->nc.decoding_hash); | |
d353d8d4 | 1500 | } |
d56b1705 MH |
1501 | |
1502 | /** | |
1503 | * batadv_nc_nodes_seq_print_text - print the nc node information | |
1504 | * @seq: seq file to print on | |
1505 | * @offset: not used | |
1506 | */ | |
1507 | int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) | |
1508 | { | |
1509 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1510 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1511 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1512 | struct batadv_hard_iface *primary_if; | |
1513 | struct hlist_head *head; | |
1514 | struct batadv_orig_node *orig_node; | |
1515 | struct batadv_nc_node *nc_node; | |
1516 | int i; | |
1517 | ||
1518 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1519 | if (!primary_if) | |
1520 | goto out; | |
1521 | ||
1522 | /* Traverse list of originators */ | |
1523 | for (i = 0; i < hash->size; i++) { | |
1524 | head = &hash->table[i]; | |
1525 | ||
1526 | /* For each orig_node in this bin */ | |
1527 | rcu_read_lock(); | |
1528 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
1529 | seq_printf(seq, "Node: %pM\n", orig_node->orig); | |
1530 | ||
1531 | seq_printf(seq, " Ingoing: "); | |
1532 | /* For each in_nc_node to this orig_node */ | |
1533 | list_for_each_entry_rcu(nc_node, | |
1534 | &orig_node->in_coding_list, | |
1535 | list) | |
1536 | seq_printf(seq, "%pM ", | |
1537 | nc_node->addr); | |
1538 | seq_printf(seq, "\n"); | |
1539 | ||
1540 | seq_printf(seq, " Outgoing: "); | |
1541 | /* For out_nc_node to this orig_node */ | |
1542 | list_for_each_entry_rcu(nc_node, | |
1543 | &orig_node->out_coding_list, | |
1544 | list) | |
1545 | seq_printf(seq, "%pM ", | |
1546 | nc_node->addr); | |
1547 | seq_printf(seq, "\n\n"); | |
1548 | } | |
1549 | rcu_read_unlock(); | |
1550 | } | |
1551 | ||
1552 | out: | |
1553 | if (primary_if) | |
1554 | batadv_hardif_free_ref(primary_if); | |
1555 | return 0; | |
1556 | } | |
1557 | ||
1558 | /** | |
1559 | * batadv_nc_init_debugfs - create nc folder and related files in debugfs | |
1560 | * @bat_priv: the bat priv with all the soft interface information | |
1561 | */ | |
1562 | int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) | |
1563 | { | |
1564 | struct dentry *nc_dir, *file; | |
1565 | ||
1566 | nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir); | |
1567 | if (!nc_dir) | |
1568 | goto out; | |
1569 | ||
1570 | file = debugfs_create_u8("min_tq", S_IRUGO | S_IWUSR, nc_dir, | |
1571 | &bat_priv->nc.min_tq); | |
1572 | if (!file) | |
1573 | goto out; | |
1574 | ||
95332477 MH |
1575 | file = debugfs_create_u32("max_fwd_delay", S_IRUGO | S_IWUSR, nc_dir, |
1576 | &bat_priv->nc.max_fwd_delay); | |
1577 | if (!file) | |
1578 | goto out; | |
1579 | ||
612d2b4f MH |
1580 | file = debugfs_create_u32("max_buffer_time", S_IRUGO | S_IWUSR, nc_dir, |
1581 | &bat_priv->nc.max_buffer_time); | |
1582 | if (!file) | |
1583 | goto out; | |
1584 | ||
d56b1705 MH |
1585 | return 0; |
1586 | ||
1587 | out: | |
1588 | return -ENOMEM; | |
1589 | } |