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0046b040 | 1 | /* Copyright (C) 2012-2016 B.A.T.M.A.N. contributors: |
d353d8d4 MH |
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 | |
ebf38fb7 | 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
d353d8d4 MH |
16 | */ |
17 | ||
1e2c2a4f SE |
18 | #include "network-coding.h" |
19 | #include "main.h" | |
20 | ||
21 | #include <linux/atomic.h> | |
4635469f | 22 | #include <linux/bitops.h> |
1e2c2a4f SE |
23 | #include <linux/byteorder/generic.h> |
24 | #include <linux/compiler.h> | |
d56b1705 | 25 | #include <linux/debugfs.h> |
1e2c2a4f SE |
26 | #include <linux/errno.h> |
27 | #include <linux/etherdevice.h> | |
28 | #include <linux/fs.h> | |
29 | #include <linux/if_ether.h> | |
30 | #include <linux/if_packet.h> | |
31 | #include <linux/init.h> | |
32 | #include <linux/jhash.h> | |
33 | #include <linux/jiffies.h> | |
34 | #include <linux/kernel.h> | |
daf99b48 | 35 | #include <linux/kref.h> |
1e2c2a4f SE |
36 | #include <linux/list.h> |
37 | #include <linux/lockdep.h> | |
38 | #include <linux/netdevice.h> | |
39 | #include <linux/printk.h> | |
40 | #include <linux/random.h> | |
41 | #include <linux/rculist.h> | |
42 | #include <linux/rcupdate.h> | |
43 | #include <linux/seq_file.h> | |
44 | #include <linux/skbuff.h> | |
45 | #include <linux/slab.h> | |
46 | #include <linux/spinlock.h> | |
47 | #include <linux/stat.h> | |
48 | #include <linux/stddef.h> | |
49 | #include <linux/string.h> | |
50 | #include <linux/workqueue.h> | |
d56b1705 | 51 | |
1e2c2a4f | 52 | #include "hard-interface.h" |
95332477 | 53 | #include "hash.h" |
d56b1705 | 54 | #include "originator.h" |
1e2c2a4f | 55 | #include "packet.h" |
2df5278b | 56 | #include "routing.h" |
1e2c2a4f | 57 | #include "send.h" |
d353d8d4 | 58 | |
95332477 | 59 | static struct lock_class_key batadv_nc_coding_hash_lock_class_key; |
612d2b4f | 60 | static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; |
95332477 | 61 | |
d353d8d4 | 62 | static void batadv_nc_worker(struct work_struct *work); |
2df5278b MH |
63 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, |
64 | struct batadv_hard_iface *recv_if); | |
d353d8d4 | 65 | |
6c519bad MS |
66 | /** |
67 | * batadv_nc_init - one-time initialization for network coding | |
672e7978 SE |
68 | * |
69 | * Return: 0 on success or negative error number in case of failure | |
6c519bad MS |
70 | */ |
71 | int __init batadv_nc_init(void) | |
72 | { | |
73 | int ret; | |
74 | ||
75 | /* Register our packet type */ | |
76 | ret = batadv_recv_handler_register(BATADV_CODED, | |
77 | batadv_nc_recv_coded_packet); | |
78 | ||
79 | return ret; | |
80 | } | |
81 | ||
d353d8d4 MH |
82 | /** |
83 | * batadv_nc_start_timer - initialise the nc periodic worker | |
84 | * @bat_priv: the bat priv with all the soft interface information | |
85 | */ | |
86 | static void batadv_nc_start_timer(struct batadv_priv *bat_priv) | |
87 | { | |
88 | queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work, | |
89 | msecs_to_jiffies(10)); | |
90 | } | |
91 | ||
3f4841ff ML |
92 | /** |
93 | * batadv_nc_tvlv_container_update - update the network coding tvlv container | |
94 | * after network coding setting change | |
95 | * @bat_priv: the bat priv with all the soft interface information | |
96 | */ | |
97 | static void batadv_nc_tvlv_container_update(struct batadv_priv *bat_priv) | |
98 | { | |
99 | char nc_mode; | |
100 | ||
101 | nc_mode = atomic_read(&bat_priv->network_coding); | |
102 | ||
103 | switch (nc_mode) { | |
104 | case 0: | |
105 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
106 | break; | |
107 | case 1: | |
108 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_NC, 1, | |
109 | NULL, 0); | |
110 | break; | |
111 | } | |
112 | } | |
113 | ||
114 | /** | |
115 | * batadv_nc_status_update - update the network coding tvlv container after | |
116 | * network coding setting change | |
117 | * @net_dev: the soft interface net device | |
118 | */ | |
119 | void batadv_nc_status_update(struct net_device *net_dev) | |
120 | { | |
121 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
f138694b | 122 | |
3f4841ff ML |
123 | batadv_nc_tvlv_container_update(bat_priv); |
124 | } | |
125 | ||
126 | /** | |
127 | * batadv_nc_tvlv_ogm_handler_v1 - process incoming nc tvlv container | |
128 | * @bat_priv: the bat priv with all the soft interface information | |
129 | * @orig: the orig_node of the ogm | |
130 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
131 | * @tvlv_value: tvlv buffer containing the gateway data | |
132 | * @tvlv_value_len: tvlv buffer length | |
133 | */ | |
134 | static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
135 | struct batadv_orig_node *orig, | |
6b5e971a SE |
136 | u8 flags, |
137 | void *tvlv_value, u16 tvlv_value_len) | |
3f4841ff ML |
138 | { |
139 | if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) | |
4635469f | 140 | clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); |
3f4841ff | 141 | else |
4635469f | 142 | set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); |
3f4841ff ML |
143 | } |
144 | ||
d353d8d4 | 145 | /** |
6c519bad | 146 | * batadv_nc_mesh_init - initialise coding hash table and start house keeping |
d353d8d4 | 147 | * @bat_priv: the bat priv with all the soft interface information |
672e7978 SE |
148 | * |
149 | * Return: 0 on success or negative error number in case of failure | |
d353d8d4 | 150 | */ |
6c519bad | 151 | int batadv_nc_mesh_init(struct batadv_priv *bat_priv) |
d353d8d4 | 152 | { |
95332477 | 153 | bat_priv->nc.timestamp_fwd_flush = jiffies; |
612d2b4f | 154 | bat_priv->nc.timestamp_sniffed_purge = jiffies; |
95332477 | 155 | |
612d2b4f | 156 | if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) |
95332477 MH |
157 | return 0; |
158 | ||
159 | bat_priv->nc.coding_hash = batadv_hash_new(128); | |
160 | if (!bat_priv->nc.coding_hash) | |
161 | goto err; | |
162 | ||
163 | batadv_hash_set_lock_class(bat_priv->nc.coding_hash, | |
164 | &batadv_nc_coding_hash_lock_class_key); | |
165 | ||
612d2b4f MH |
166 | bat_priv->nc.decoding_hash = batadv_hash_new(128); |
167 | if (!bat_priv->nc.decoding_hash) | |
168 | goto err; | |
169 | ||
f44d5407 | 170 | batadv_hash_set_lock_class(bat_priv->nc.decoding_hash, |
612d2b4f MH |
171 | &batadv_nc_decoding_hash_lock_class_key); |
172 | ||
d353d8d4 MH |
173 | INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); |
174 | batadv_nc_start_timer(bat_priv); | |
175 | ||
3f4841ff ML |
176 | batadv_tvlv_handler_register(bat_priv, batadv_nc_tvlv_ogm_handler_v1, |
177 | NULL, BATADV_TVLV_NC, 1, | |
178 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
179 | batadv_nc_tvlv_container_update(bat_priv); | |
d353d8d4 | 180 | return 0; |
95332477 MH |
181 | |
182 | err: | |
183 | return -ENOMEM; | |
d353d8d4 MH |
184 | } |
185 | ||
186 | /** | |
187 | * batadv_nc_init_bat_priv - initialise the nc specific bat_priv variables | |
188 | * @bat_priv: the bat priv with all the soft interface information | |
189 | */ | |
190 | void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) | |
191 | { | |
dab7b621 | 192 | atomic_set(&bat_priv->network_coding, 0); |
d56b1705 | 193 | bat_priv->nc.min_tq = 200; |
95332477 | 194 | bat_priv->nc.max_fwd_delay = 10; |
612d2b4f | 195 | bat_priv->nc.max_buffer_time = 200; |
d56b1705 MH |
196 | } |
197 | ||
198 | /** | |
199 | * batadv_nc_init_orig - initialise the nc fields of an orig_node | |
200 | * @orig_node: the orig_node which is going to be initialised | |
201 | */ | |
202 | void batadv_nc_init_orig(struct batadv_orig_node *orig_node) | |
203 | { | |
204 | INIT_LIST_HEAD(&orig_node->in_coding_list); | |
205 | INIT_LIST_HEAD(&orig_node->out_coding_list); | |
206 | spin_lock_init(&orig_node->in_coding_list_lock); | |
207 | spin_lock_init(&orig_node->out_coding_list_lock); | |
208 | } | |
209 | ||
210 | /** | |
44e8e7e9 SE |
211 | * batadv_nc_node_release - release nc_node from lists and queue for free after |
212 | * rcu grace period | |
daf99b48 | 213 | * @ref: kref pointer of the nc_node |
d56b1705 | 214 | */ |
daf99b48 | 215 | static void batadv_nc_node_release(struct kref *ref) |
d56b1705 | 216 | { |
daf99b48 SE |
217 | struct batadv_nc_node *nc_node; |
218 | ||
219 | nc_node = container_of(ref, struct batadv_nc_node, refcount); | |
220 | ||
5d967310 | 221 | batadv_orig_node_put(nc_node->orig_node); |
44e8e7e9 | 222 | kfree_rcu(nc_node, rcu); |
d56b1705 MH |
223 | } |
224 | ||
225 | /** | |
27ad7545 | 226 | * batadv_nc_node_put - decrement the nc_node refcounter and possibly |
44e8e7e9 | 227 | * release it |
daf99b48 | 228 | * @nc_node: nc_node to be free'd |
d56b1705 | 229 | */ |
27ad7545 | 230 | static void batadv_nc_node_put(struct batadv_nc_node *nc_node) |
d56b1705 | 231 | { |
daf99b48 | 232 | kref_put(&nc_node->refcount, batadv_nc_node_release); |
d56b1705 MH |
233 | } |
234 | ||
95332477 | 235 | /** |
727e0cd5 SE |
236 | * batadv_nc_path_release - release nc_path from lists and queue for free after |
237 | * rcu grace period | |
238 | * @ref: kref pointer of the nc_path | |
239 | */ | |
240 | static void batadv_nc_path_release(struct kref *ref) | |
241 | { | |
242 | struct batadv_nc_path *nc_path; | |
243 | ||
244 | nc_path = container_of(ref, struct batadv_nc_path, refcount); | |
245 | ||
246 | kfree_rcu(nc_path, rcu); | |
247 | } | |
248 | ||
249 | /** | |
5fff2825 | 250 | * batadv_nc_path_put - decrement the nc_path refcounter and possibly |
727e0cd5 SE |
251 | * release it |
252 | * @nc_path: nc_path to be free'd | |
95332477 | 253 | */ |
5fff2825 | 254 | static void batadv_nc_path_put(struct batadv_nc_path *nc_path) |
95332477 | 255 | { |
727e0cd5 | 256 | kref_put(&nc_path->refcount, batadv_nc_path_release); |
95332477 MH |
257 | } |
258 | ||
259 | /** | |
260 | * batadv_nc_packet_free - frees nc packet | |
261 | * @nc_packet: the nc packet to free | |
262 | */ | |
263 | static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet) | |
264 | { | |
c799443e | 265 | kfree_skb(nc_packet->skb); |
5fff2825 | 266 | batadv_nc_path_put(nc_packet->nc_path); |
95332477 MH |
267 | kfree(nc_packet); |
268 | } | |
269 | ||
d56b1705 MH |
270 | /** |
271 | * batadv_nc_to_purge_nc_node - checks whether an nc node has to be purged | |
272 | * @bat_priv: the bat priv with all the soft interface information | |
273 | * @nc_node: the nc node to check | |
274 | * | |
62fe710f | 275 | * Return: true if the entry has to be purged now, false otherwise |
d56b1705 MH |
276 | */ |
277 | static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, | |
278 | struct batadv_nc_node *nc_node) | |
279 | { | |
280 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
281 | return true; | |
282 | ||
283 | return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT); | |
284 | } | |
285 | ||
95332477 MH |
286 | /** |
287 | * batadv_nc_to_purge_nc_path_coding - checks whether an nc path has timed out | |
288 | * @bat_priv: the bat priv with all the soft interface information | |
289 | * @nc_path: the nc path to check | |
290 | * | |
62fe710f | 291 | * Return: true if the entry has to be purged now, false otherwise |
95332477 MH |
292 | */ |
293 | static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, | |
294 | struct batadv_nc_path *nc_path) | |
295 | { | |
296 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
297 | return true; | |
298 | ||
299 | /* purge the path when no packets has been added for 10 times the | |
300 | * max_fwd_delay time | |
301 | */ | |
302 | return batadv_has_timed_out(nc_path->last_valid, | |
303 | bat_priv->nc.max_fwd_delay * 10); | |
304 | } | |
305 | ||
612d2b4f MH |
306 | /** |
307 | * batadv_nc_to_purge_nc_path_decoding - checks whether an nc path has timed out | |
308 | * @bat_priv: the bat priv with all the soft interface information | |
309 | * @nc_path: the nc path to check | |
310 | * | |
62fe710f | 311 | * Return: true if the entry has to be purged now, false otherwise |
612d2b4f MH |
312 | */ |
313 | static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, | |
314 | struct batadv_nc_path *nc_path) | |
315 | { | |
316 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
317 | return true; | |
318 | ||
319 | /* purge the path when no packets has been added for 10 times the | |
320 | * max_buffer time | |
321 | */ | |
322 | return batadv_has_timed_out(nc_path->last_valid, | |
fc1f8693 | 323 | bat_priv->nc.max_buffer_time * 10); |
612d2b4f MH |
324 | } |
325 | ||
d56b1705 MH |
326 | /** |
327 | * batadv_nc_purge_orig_nc_nodes - go through list of nc nodes and purge stale | |
328 | * entries | |
329 | * @bat_priv: the bat priv with all the soft interface information | |
330 | * @list: list of nc nodes | |
331 | * @lock: nc node list lock | |
332 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
333 | * not. This function takes the nc node as argument and has to return | |
334 | * a boolean value: true if the entry has to be deleted, false | |
335 | * otherwise | |
336 | */ | |
337 | static void | |
338 | batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, | |
339 | struct list_head *list, | |
340 | spinlock_t *lock, | |
341 | bool (*to_purge)(struct batadv_priv *, | |
342 | struct batadv_nc_node *)) | |
343 | { | |
344 | struct batadv_nc_node *nc_node, *nc_node_tmp; | |
345 | ||
346 | /* For each nc_node in list */ | |
347 | spin_lock_bh(lock); | |
348 | list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) { | |
349 | /* if an helper function has been passed as parameter, | |
350 | * ask it if the entry has to be purged or not | |
351 | */ | |
352 | if (to_purge && !to_purge(bat_priv, nc_node)) | |
353 | continue; | |
354 | ||
355 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
356 | "Removing nc_node %pM -> %pM\n", | |
357 | nc_node->addr, nc_node->orig_node->orig); | |
358 | list_del_rcu(&nc_node->list); | |
27ad7545 | 359 | batadv_nc_node_put(nc_node); |
d56b1705 MH |
360 | } |
361 | spin_unlock_bh(lock); | |
362 | } | |
363 | ||
364 | /** | |
365 | * batadv_nc_purge_orig - purges all nc node data attached of the given | |
366 | * originator | |
367 | * @bat_priv: the bat priv with all the soft interface information | |
368 | * @orig_node: orig_node with the nc node entries to be purged | |
369 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
370 | * not. This function takes the nc node as argument and has to return | |
371 | * a boolean value: true is the entry has to be deleted, false | |
372 | * otherwise | |
373 | */ | |
374 | void batadv_nc_purge_orig(struct batadv_priv *bat_priv, | |
375 | struct batadv_orig_node *orig_node, | |
376 | bool (*to_purge)(struct batadv_priv *, | |
377 | struct batadv_nc_node *)) | |
378 | { | |
379 | /* Check ingoing nc_node's of this orig_node */ | |
380 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list, | |
381 | &orig_node->in_coding_list_lock, | |
382 | to_purge); | |
383 | ||
384 | /* Check outgoing nc_node's of this orig_node */ | |
385 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list, | |
386 | &orig_node->out_coding_list_lock, | |
387 | to_purge); | |
388 | } | |
389 | ||
390 | /** | |
391 | * batadv_nc_purge_orig_hash - traverse entire originator hash to check if they | |
392 | * have timed out nc nodes | |
393 | * @bat_priv: the bat priv with all the soft interface information | |
394 | */ | |
395 | static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) | |
396 | { | |
397 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
398 | struct hlist_head *head; | |
399 | struct batadv_orig_node *orig_node; | |
6b5e971a | 400 | u32 i; |
d56b1705 MH |
401 | |
402 | if (!hash) | |
403 | return; | |
404 | ||
405 | /* For each orig_node */ | |
406 | for (i = 0; i < hash->size; i++) { | |
407 | head = &hash->table[i]; | |
408 | ||
409 | rcu_read_lock(); | |
410 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) | |
411 | batadv_nc_purge_orig(bat_priv, orig_node, | |
412 | batadv_nc_to_purge_nc_node); | |
413 | rcu_read_unlock(); | |
414 | } | |
d353d8d4 MH |
415 | } |
416 | ||
95332477 MH |
417 | /** |
418 | * batadv_nc_purge_paths - traverse all nc paths part of the hash and remove | |
419 | * unused ones | |
420 | * @bat_priv: the bat priv with all the soft interface information | |
421 | * @hash: hash table containing the nc paths to check | |
422 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
423 | * not. This function takes the nc node as argument and has to return | |
424 | * a boolean value: true is the entry has to be deleted, false | |
425 | * otherwise | |
426 | */ | |
427 | static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, | |
428 | struct batadv_hashtable *hash, | |
429 | bool (*to_purge)(struct batadv_priv *, | |
430 | struct batadv_nc_path *)) | |
431 | { | |
432 | struct hlist_head *head; | |
433 | struct hlist_node *node_tmp; | |
434 | struct batadv_nc_path *nc_path; | |
435 | spinlock_t *lock; /* Protects lists in hash */ | |
6b5e971a | 436 | u32 i; |
95332477 MH |
437 | |
438 | for (i = 0; i < hash->size; i++) { | |
439 | head = &hash->table[i]; | |
440 | lock = &hash->list_locks[i]; | |
441 | ||
442 | /* For each nc_path in this bin */ | |
443 | spin_lock_bh(lock); | |
444 | hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) { | |
445 | /* if an helper function has been passed as parameter, | |
446 | * ask it if the entry has to be purged or not | |
447 | */ | |
448 | if (to_purge && !to_purge(bat_priv, nc_path)) | |
449 | continue; | |
450 | ||
451 | /* purging an non-empty nc_path should never happen, but | |
452 | * is observed under high CPU load. Delay the purging | |
453 | * until next iteration to allow the packet_list to be | |
454 | * emptied first. | |
455 | */ | |
456 | if (!unlikely(list_empty(&nc_path->packet_list))) { | |
457 | net_ratelimited_function(printk, | |
458 | KERN_WARNING | |
459 | "Skipping free of non-empty nc_path (%pM -> %pM)!\n", | |
460 | nc_path->prev_hop, | |
461 | nc_path->next_hop); | |
462 | continue; | |
463 | } | |
464 | ||
465 | /* nc_path is unused, so remove it */ | |
466 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
467 | "Remove nc_path %pM -> %pM\n", | |
468 | nc_path->prev_hop, nc_path->next_hop); | |
469 | hlist_del_rcu(&nc_path->hash_entry); | |
5fff2825 | 470 | batadv_nc_path_put(nc_path); |
95332477 MH |
471 | } |
472 | spin_unlock_bh(lock); | |
473 | } | |
474 | } | |
475 | ||
476 | /** | |
477 | * batadv_nc_hash_key_gen - computes the nc_path hash key | |
478 | * @key: buffer to hold the final hash key | |
479 | * @src: source ethernet mac address going into the hash key | |
480 | * @dst: destination ethernet mac address going into the hash key | |
481 | */ | |
482 | static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, | |
483 | const char *dst) | |
484 | { | |
485 | memcpy(key->prev_hop, src, sizeof(key->prev_hop)); | |
486 | memcpy(key->next_hop, dst, sizeof(key->next_hop)); | |
487 | } | |
488 | ||
489 | /** | |
490 | * batadv_nc_hash_choose - compute the hash value for an nc path | |
491 | * @data: data to hash | |
492 | * @size: size of the hash table | |
493 | * | |
62fe710f | 494 | * Return: the selected index in the hash table for the given data. |
95332477 | 495 | */ |
6b5e971a | 496 | static u32 batadv_nc_hash_choose(const void *data, u32 size) |
95332477 MH |
497 | { |
498 | const struct batadv_nc_path *nc_path = data; | |
6b5e971a | 499 | u32 hash = 0; |
95332477 | 500 | |
36fd61cb SE |
501 | hash = jhash(&nc_path->prev_hop, sizeof(nc_path->prev_hop), hash); |
502 | hash = jhash(&nc_path->next_hop, sizeof(nc_path->next_hop), hash); | |
95332477 MH |
503 | |
504 | return hash % size; | |
505 | } | |
506 | ||
507 | /** | |
508 | * batadv_nc_hash_compare - comparing function used in the network coding hash | |
509 | * tables | |
510 | * @node: node in the local table | |
511 | * @data2: second object to compare the node to | |
512 | * | |
4b426b10 | 513 | * Return: true if the two entry are the same, false otherwise |
95332477 | 514 | */ |
4b426b10 SE |
515 | static bool batadv_nc_hash_compare(const struct hlist_node *node, |
516 | const void *data2) | |
95332477 MH |
517 | { |
518 | const struct batadv_nc_path *nc_path1, *nc_path2; | |
519 | ||
520 | nc_path1 = container_of(node, struct batadv_nc_path, hash_entry); | |
521 | nc_path2 = data2; | |
522 | ||
523 | /* Return 1 if the two keys are identical */ | |
676970e5 | 524 | if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop)) |
4b426b10 | 525 | return false; |
95332477 | 526 | |
676970e5 | 527 | if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop)) |
4b426b10 | 528 | return false; |
95332477 | 529 | |
4b426b10 | 530 | return true; |
95332477 MH |
531 | } |
532 | ||
533 | /** | |
534 | * batadv_nc_hash_find - search for an existing nc path and return it | |
535 | * @hash: hash table containing the nc path | |
536 | * @data: search key | |
537 | * | |
62fe710f | 538 | * Return: the nc_path if found, NULL otherwise. |
95332477 MH |
539 | */ |
540 | static struct batadv_nc_path * | |
541 | batadv_nc_hash_find(struct batadv_hashtable *hash, | |
542 | void *data) | |
543 | { | |
544 | struct hlist_head *head; | |
545 | struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; | |
546 | int index; | |
547 | ||
548 | if (!hash) | |
549 | return NULL; | |
550 | ||
551 | index = batadv_nc_hash_choose(data, hash->size); | |
552 | head = &hash->table[index]; | |
553 | ||
554 | rcu_read_lock(); | |
555 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
556 | if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) | |
557 | continue; | |
558 | ||
727e0cd5 | 559 | if (!kref_get_unless_zero(&nc_path->refcount)) |
95332477 MH |
560 | continue; |
561 | ||
562 | nc_path_tmp = nc_path; | |
563 | break; | |
564 | } | |
565 | rcu_read_unlock(); | |
566 | ||
567 | return nc_path_tmp; | |
568 | } | |
569 | ||
570 | /** | |
571 | * batadv_nc_send_packet - send non-coded packet and free nc_packet struct | |
572 | * @nc_packet: the nc packet to send | |
573 | */ | |
574 | static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) | |
575 | { | |
95d39278 | 576 | batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node); |
95332477 MH |
577 | nc_packet->skb = NULL; |
578 | batadv_nc_packet_free(nc_packet); | |
579 | } | |
580 | ||
612d2b4f MH |
581 | /** |
582 | * batadv_nc_sniffed_purge - Checks timestamp of given sniffed nc_packet. | |
583 | * @bat_priv: the bat priv with all the soft interface information | |
584 | * @nc_path: the nc path the packet belongs to | |
585 | * @nc_packet: the nc packet to be checked | |
586 | * | |
587 | * Checks whether the given sniffed (overheard) nc_packet has hit its buffering | |
588 | * timeout. If so, the packet is no longer kept and the entry deleted from the | |
589 | * queue. Has to be called with the appropriate locks. | |
590 | * | |
62fe710f | 591 | * Return: false as soon as the entry in the fifo queue has not been timed out |
612d2b4f MH |
592 | * yet and true otherwise. |
593 | */ | |
594 | static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, | |
595 | struct batadv_nc_path *nc_path, | |
596 | struct batadv_nc_packet *nc_packet) | |
597 | { | |
598 | unsigned long timeout = bat_priv->nc.max_buffer_time; | |
599 | bool res = false; | |
600 | ||
2c72d655 SE |
601 | lockdep_assert_held(&nc_path->packet_list_lock); |
602 | ||
612d2b4f MH |
603 | /* Packets are added to tail, so the remaining packets did not time |
604 | * out and we can stop processing the current queue | |
605 | */ | |
606 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
607 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
608 | goto out; | |
609 | ||
610 | /* purge nc packet */ | |
611 | list_del(&nc_packet->list); | |
612 | batadv_nc_packet_free(nc_packet); | |
613 | ||
614 | res = true; | |
615 | ||
616 | out: | |
617 | return res; | |
618 | } | |
619 | ||
95332477 MH |
620 | /** |
621 | * batadv_nc_fwd_flush - Checks the timestamp of the given nc packet. | |
622 | * @bat_priv: the bat priv with all the soft interface information | |
623 | * @nc_path: the nc path the packet belongs to | |
624 | * @nc_packet: the nc packet to be checked | |
625 | * | |
626 | * Checks whether the given nc packet has hit its forward timeout. If so, the | |
627 | * packet is no longer delayed, immediately sent and the entry deleted from the | |
628 | * queue. Has to be called with the appropriate locks. | |
629 | * | |
62fe710f | 630 | * Return: false as soon as the entry in the fifo queue has not been timed out |
95332477 MH |
631 | * yet and true otherwise. |
632 | */ | |
633 | static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, | |
634 | struct batadv_nc_path *nc_path, | |
635 | struct batadv_nc_packet *nc_packet) | |
636 | { | |
637 | unsigned long timeout = bat_priv->nc.max_fwd_delay; | |
638 | ||
2c72d655 SE |
639 | lockdep_assert_held(&nc_path->packet_list_lock); |
640 | ||
95332477 MH |
641 | /* Packets are added to tail, so the remaining packets did not time |
642 | * out and we can stop processing the current queue | |
643 | */ | |
644 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
645 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
646 | return false; | |
647 | ||
648 | /* Send packet */ | |
649 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); | |
650 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
651 | nc_packet->skb->len + ETH_HLEN); | |
652 | list_del(&nc_packet->list); | |
653 | batadv_nc_send_packet(nc_packet); | |
654 | ||
655 | return true; | |
656 | } | |
657 | ||
658 | /** | |
659 | * batadv_nc_process_nc_paths - traverse given nc packet pool and free timed out | |
660 | * nc packets | |
661 | * @bat_priv: the bat priv with all the soft interface information | |
662 | * @hash: to be processed hash table | |
663 | * @process_fn: Function called to process given nc packet. Should return true | |
664 | * to encourage this function to proceed with the next packet. | |
665 | * Otherwise the rest of the current queue is skipped. | |
666 | */ | |
667 | static void | |
668 | batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, | |
669 | struct batadv_hashtable *hash, | |
670 | bool (*process_fn)(struct batadv_priv *, | |
671 | struct batadv_nc_path *, | |
672 | struct batadv_nc_packet *)) | |
673 | { | |
674 | struct hlist_head *head; | |
675 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
676 | struct batadv_nc_path *nc_path; | |
677 | bool ret; | |
678 | int i; | |
679 | ||
680 | if (!hash) | |
681 | return; | |
682 | ||
683 | /* Loop hash table bins */ | |
684 | for (i = 0; i < hash->size; i++) { | |
685 | head = &hash->table[i]; | |
686 | ||
687 | /* Loop coding paths */ | |
688 | rcu_read_lock(); | |
689 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
690 | /* Loop packets */ | |
691 | spin_lock_bh(&nc_path->packet_list_lock); | |
692 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
693 | &nc_path->packet_list, list) { | |
694 | ret = process_fn(bat_priv, nc_path, nc_packet); | |
695 | if (!ret) | |
696 | break; | |
697 | } | |
698 | spin_unlock_bh(&nc_path->packet_list_lock); | |
699 | } | |
700 | rcu_read_unlock(); | |
701 | } | |
702 | } | |
703 | ||
d353d8d4 MH |
704 | /** |
705 | * batadv_nc_worker - periodic task for house keeping related to network coding | |
706 | * @work: kernel work struct | |
707 | */ | |
708 | static void batadv_nc_worker(struct work_struct *work) | |
709 | { | |
710 | struct delayed_work *delayed_work; | |
711 | struct batadv_priv_nc *priv_nc; | |
712 | struct batadv_priv *bat_priv; | |
95332477 | 713 | unsigned long timeout; |
d353d8d4 | 714 | |
4ba4bc0f | 715 | delayed_work = to_delayed_work(work); |
d353d8d4 MH |
716 | priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); |
717 | bat_priv = container_of(priv_nc, struct batadv_priv, nc); | |
718 | ||
d56b1705 | 719 | batadv_nc_purge_orig_hash(bat_priv); |
95332477 MH |
720 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, |
721 | batadv_nc_to_purge_nc_path_coding); | |
612d2b4f MH |
722 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, |
723 | batadv_nc_to_purge_nc_path_decoding); | |
95332477 MH |
724 | |
725 | timeout = bat_priv->nc.max_fwd_delay; | |
726 | ||
727 | if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { | |
728 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, | |
729 | batadv_nc_fwd_flush); | |
730 | bat_priv->nc.timestamp_fwd_flush = jiffies; | |
731 | } | |
d56b1705 | 732 | |
612d2b4f MH |
733 | if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, |
734 | bat_priv->nc.max_buffer_time)) { | |
735 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, | |
736 | batadv_nc_sniffed_purge); | |
737 | bat_priv->nc.timestamp_sniffed_purge = jiffies; | |
738 | } | |
739 | ||
d353d8d4 MH |
740 | /* Schedule a new check */ |
741 | batadv_nc_start_timer(bat_priv); | |
742 | } | |
743 | ||
d56b1705 MH |
744 | /** |
745 | * batadv_can_nc_with_orig - checks whether the given orig node is suitable for | |
746 | * coding or not | |
747 | * @bat_priv: the bat priv with all the soft interface information | |
748 | * @orig_node: neighboring orig node which may be used as nc candidate | |
749 | * @ogm_packet: incoming ogm packet also used for the checks | |
750 | * | |
62fe710f | 751 | * Return: true if: |
d56b1705 MH |
752 | * 1) The OGM must have the most recent sequence number. |
753 | * 2) The TTL must be decremented by one and only one. | |
754 | * 3) The OGM must be received from the first hop from orig_node. | |
755 | * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. | |
756 | */ | |
757 | static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, | |
758 | struct batadv_orig_node *orig_node, | |
759 | struct batadv_ogm_packet *ogm_packet) | |
760 | { | |
7351a482 | 761 | struct batadv_orig_ifinfo *orig_ifinfo; |
6b5e971a SE |
762 | u32 last_real_seqno; |
763 | u8 last_ttl; | |
7351a482 SW |
764 | |
765 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, BATADV_IF_DEFAULT); | |
766 | if (!orig_ifinfo) | |
d56b1705 | 767 | return false; |
7351a482 SW |
768 | |
769 | last_ttl = orig_ifinfo->last_ttl; | |
770 | last_real_seqno = orig_ifinfo->last_real_seqno; | |
35f94779 | 771 | batadv_orig_ifinfo_put(orig_ifinfo); |
7351a482 SW |
772 | |
773 | if (last_real_seqno != ntohl(ogm_packet->seqno)) | |
774 | return false; | |
775 | if (last_ttl != ogm_packet->ttl + 1) | |
d56b1705 MH |
776 | return false; |
777 | if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) | |
778 | return false; | |
779 | if (ogm_packet->tq < bat_priv->nc.min_tq) | |
780 | return false; | |
781 | ||
782 | return true; | |
783 | } | |
784 | ||
785 | /** | |
786 | * batadv_nc_find_nc_node - search for an existing nc node and return it | |
787 | * @orig_node: orig node originating the ogm packet | |
788 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
789 | * (can be equal to orig_node) | |
790 | * @in_coding: traverse incoming or outgoing network coding list | |
791 | * | |
62fe710f | 792 | * Return: the nc_node if found, NULL otherwise. |
d56b1705 | 793 | */ |
6fc77a54 SE |
794 | static struct batadv_nc_node * |
795 | batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, | |
796 | struct batadv_orig_node *orig_neigh_node, | |
797 | bool in_coding) | |
d56b1705 MH |
798 | { |
799 | struct batadv_nc_node *nc_node, *nc_node_out = NULL; | |
800 | struct list_head *list; | |
801 | ||
802 | if (in_coding) | |
803 | list = &orig_neigh_node->in_coding_list; | |
804 | else | |
805 | list = &orig_neigh_node->out_coding_list; | |
806 | ||
807 | /* Traverse list of nc_nodes to orig_node */ | |
808 | rcu_read_lock(); | |
809 | list_for_each_entry_rcu(nc_node, list, list) { | |
810 | if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) | |
811 | continue; | |
812 | ||
daf99b48 | 813 | if (!kref_get_unless_zero(&nc_node->refcount)) |
d56b1705 MH |
814 | continue; |
815 | ||
816 | /* Found a match */ | |
817 | nc_node_out = nc_node; | |
818 | break; | |
819 | } | |
820 | rcu_read_unlock(); | |
821 | ||
822 | return nc_node_out; | |
823 | } | |
824 | ||
825 | /** | |
826 | * batadv_nc_get_nc_node - retrieves an nc node or creates the entry if it was | |
827 | * not found | |
828 | * @bat_priv: the bat priv with all the soft interface information | |
829 | * @orig_node: orig node originating the ogm packet | |
830 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
831 | * (can be equal to orig_node) | |
832 | * @in_coding: traverse incoming or outgoing network coding list | |
833 | * | |
62fe710f | 834 | * Return: the nc_node if found or created, NULL in case of an error. |
d56b1705 | 835 | */ |
6fc77a54 SE |
836 | static struct batadv_nc_node * |
837 | batadv_nc_get_nc_node(struct batadv_priv *bat_priv, | |
838 | struct batadv_orig_node *orig_node, | |
839 | struct batadv_orig_node *orig_neigh_node, | |
840 | bool in_coding) | |
d56b1705 MH |
841 | { |
842 | struct batadv_nc_node *nc_node; | |
843 | spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ | |
844 | struct list_head *list; | |
845 | ||
846 | /* Check if nc_node is already added */ | |
847 | nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); | |
848 | ||
849 | /* Node found */ | |
850 | if (nc_node) | |
851 | return nc_node; | |
852 | ||
853 | nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); | |
854 | if (!nc_node) | |
855 | return NULL; | |
856 | ||
0de32cee | 857 | kref_get(&orig_neigh_node->refcount); |
d56b1705 MH |
858 | |
859 | /* Initialize nc_node */ | |
860 | INIT_LIST_HEAD(&nc_node->list); | |
8fdd0153 | 861 | ether_addr_copy(nc_node->addr, orig_node->orig); |
d56b1705 | 862 | nc_node->orig_node = orig_neigh_node; |
daf99b48 SE |
863 | kref_init(&nc_node->refcount); |
864 | kref_get(&nc_node->refcount); | |
d56b1705 MH |
865 | |
866 | /* Select ingoing or outgoing coding node */ | |
867 | if (in_coding) { | |
868 | lock = &orig_neigh_node->in_coding_list_lock; | |
869 | list = &orig_neigh_node->in_coding_list; | |
870 | } else { | |
871 | lock = &orig_neigh_node->out_coding_list_lock; | |
872 | list = &orig_neigh_node->out_coding_list; | |
873 | } | |
874 | ||
875 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", | |
876 | nc_node->addr, nc_node->orig_node->orig); | |
877 | ||
878 | /* Add nc_node to orig_node */ | |
879 | spin_lock_bh(lock); | |
880 | list_add_tail_rcu(&nc_node->list, list); | |
881 | spin_unlock_bh(lock); | |
882 | ||
883 | return nc_node; | |
d56b1705 MH |
884 | } |
885 | ||
886 | /** | |
34473822 SE |
887 | * batadv_nc_update_nc_node - updates stored incoming and outgoing nc node |
888 | * structs (best called on incoming OGMs) | |
d56b1705 MH |
889 | * @bat_priv: the bat priv with all the soft interface information |
890 | * @orig_node: orig node originating the ogm packet | |
891 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
892 | * (can be equal to orig_node) | |
893 | * @ogm_packet: incoming ogm packet | |
894 | * @is_single_hop_neigh: orig_node is a single hop neighbor | |
895 | */ | |
896 | void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, | |
897 | struct batadv_orig_node *orig_node, | |
898 | struct batadv_orig_node *orig_neigh_node, | |
899 | struct batadv_ogm_packet *ogm_packet, | |
900 | int is_single_hop_neigh) | |
901 | { | |
4f248cff SE |
902 | struct batadv_nc_node *in_nc_node = NULL; |
903 | struct batadv_nc_node *out_nc_node = NULL; | |
d56b1705 MH |
904 | |
905 | /* Check if network coding is enabled */ | |
906 | if (!atomic_read(&bat_priv->network_coding)) | |
907 | goto out; | |
908 | ||
3f4841ff | 909 | /* check if orig node is network coding enabled */ |
4635469f | 910 | if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities)) |
3f4841ff ML |
911 | goto out; |
912 | ||
d56b1705 MH |
913 | /* accept ogms from 'good' neighbors and single hop neighbors */ |
914 | if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && | |
915 | !is_single_hop_neigh) | |
916 | goto out; | |
917 | ||
918 | /* Add orig_node as in_nc_node on hop */ | |
919 | in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, | |
920 | orig_neigh_node, true); | |
921 | if (!in_nc_node) | |
922 | goto out; | |
923 | ||
924 | in_nc_node->last_seen = jiffies; | |
925 | ||
926 | /* Add hop as out_nc_node on orig_node */ | |
927 | out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, | |
928 | orig_node, false); | |
929 | if (!out_nc_node) | |
930 | goto out; | |
931 | ||
932 | out_nc_node->last_seen = jiffies; | |
933 | ||
934 | out: | |
935 | if (in_nc_node) | |
27ad7545 | 936 | batadv_nc_node_put(in_nc_node); |
d56b1705 | 937 | if (out_nc_node) |
27ad7545 | 938 | batadv_nc_node_put(out_nc_node); |
d56b1705 MH |
939 | } |
940 | ||
95332477 MH |
941 | /** |
942 | * batadv_nc_get_path - get existing nc_path or allocate a new one | |
943 | * @bat_priv: the bat priv with all the soft interface information | |
944 | * @hash: hash table containing the nc path | |
945 | * @src: ethernet source address - first half of the nc path search key | |
946 | * @dst: ethernet destination address - second half of the nc path search key | |
947 | * | |
62fe710f | 948 | * Return: pointer to nc_path if the path was found or created, returns NULL |
95332477 MH |
949 | * on error. |
950 | */ | |
951 | static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, | |
952 | struct batadv_hashtable *hash, | |
6b5e971a SE |
953 | u8 *src, |
954 | u8 *dst) | |
95332477 MH |
955 | { |
956 | int hash_added; | |
957 | struct batadv_nc_path *nc_path, nc_path_key; | |
958 | ||
959 | batadv_nc_hash_key_gen(&nc_path_key, src, dst); | |
960 | ||
961 | /* Search for existing nc_path */ | |
962 | nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); | |
963 | ||
964 | if (nc_path) { | |
965 | /* Set timestamp to delay removal of nc_path */ | |
966 | nc_path->last_valid = jiffies; | |
967 | return nc_path; | |
968 | } | |
969 | ||
970 | /* No existing nc_path was found; create a new */ | |
971 | nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); | |
972 | ||
973 | if (!nc_path) | |
974 | return NULL; | |
975 | ||
976 | /* Initialize nc_path */ | |
977 | INIT_LIST_HEAD(&nc_path->packet_list); | |
978 | spin_lock_init(&nc_path->packet_list_lock); | |
727e0cd5 SE |
979 | kref_init(&nc_path->refcount); |
980 | kref_get(&nc_path->refcount); | |
95332477 | 981 | nc_path->last_valid = jiffies; |
8fdd0153 AQ |
982 | ether_addr_copy(nc_path->next_hop, dst); |
983 | ether_addr_copy(nc_path->prev_hop, src); | |
95332477 MH |
984 | |
985 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", | |
986 | nc_path->prev_hop, | |
987 | nc_path->next_hop); | |
988 | ||
989 | /* Add nc_path to hash table */ | |
990 | hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, | |
991 | batadv_nc_hash_choose, &nc_path_key, | |
992 | &nc_path->hash_entry); | |
993 | ||
994 | if (hash_added < 0) { | |
995 | kfree(nc_path); | |
996 | return NULL; | |
997 | } | |
998 | ||
999 | return nc_path; | |
1000 | } | |
1001 | ||
3c12de9a MH |
1002 | /** |
1003 | * batadv_nc_random_weight_tq - scale the receivers TQ-value to avoid unfair | |
1004 | * selection of a receiver with slightly lower TQ than the other | |
1005 | * @tq: to be weighted tq value | |
672e7978 SE |
1006 | * |
1007 | * Return: scaled tq value | |
3c12de9a | 1008 | */ |
6b5e971a | 1009 | static u8 batadv_nc_random_weight_tq(u8 tq) |
3c12de9a | 1010 | { |
6b5e971a | 1011 | u8 rand_val, rand_tq; |
3c12de9a MH |
1012 | |
1013 | get_random_bytes(&rand_val, sizeof(rand_val)); | |
1014 | ||
1015 | /* randomize the estimated packet loss (max TQ - estimated TQ) */ | |
1016 | rand_tq = rand_val * (BATADV_TQ_MAX_VALUE - tq); | |
1017 | ||
1018 | /* normalize the randomized packet loss */ | |
1019 | rand_tq /= BATADV_TQ_MAX_VALUE; | |
1020 | ||
1021 | /* convert to (randomized) estimated tq again */ | |
1022 | return BATADV_TQ_MAX_VALUE - rand_tq; | |
1023 | } | |
1024 | ||
1025 | /** | |
1026 | * batadv_nc_memxor - XOR destination with source | |
1027 | * @dst: byte array to XOR into | |
1028 | * @src: byte array to XOR from | |
1029 | * @len: length of destination array | |
1030 | */ | |
1031 | static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) | |
1032 | { | |
1033 | unsigned int i; | |
1034 | ||
1035 | for (i = 0; i < len; ++i) | |
1036 | dst[i] ^= src[i]; | |
1037 | } | |
1038 | ||
1039 | /** | |
1040 | * batadv_nc_code_packets - code a received unicast_packet with an nc packet | |
1041 | * into a coded_packet and send it | |
1042 | * @bat_priv: the bat priv with all the soft interface information | |
1043 | * @skb: data skb to forward | |
1044 | * @ethhdr: pointer to the ethernet header inside the skb | |
1045 | * @nc_packet: structure containing the packet to the skb can be coded with | |
1046 | * @neigh_node: next hop to forward packet to | |
1047 | * | |
62fe710f | 1048 | * Return: true if both packets are consumed, false otherwise. |
3c12de9a MH |
1049 | */ |
1050 | static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, | |
1051 | struct sk_buff *skb, | |
1052 | struct ethhdr *ethhdr, | |
1053 | struct batadv_nc_packet *nc_packet, | |
1054 | struct batadv_neigh_node *neigh_node) | |
1055 | { | |
6b5e971a | 1056 | u8 tq_weighted_neigh, tq_weighted_coding, tq_tmp; |
3c12de9a MH |
1057 | struct sk_buff *skb_dest, *skb_src; |
1058 | struct batadv_unicast_packet *packet1; | |
1059 | struct batadv_unicast_packet *packet2; | |
1060 | struct batadv_coded_packet *coded_packet; | |
95d39278 AQ |
1061 | struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest; |
1062 | struct batadv_neigh_node *router_coding = NULL, *second_dest; | |
89652331 SW |
1063 | struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL; |
1064 | struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL; | |
95d39278 | 1065 | u8 *first_source, *second_source; |
3c12de9a MH |
1066 | __be32 packet_id1, packet_id2; |
1067 | size_t count; | |
1068 | bool res = false; | |
1069 | int coding_len; | |
1070 | int unicast_size = sizeof(*packet1); | |
1071 | int coded_size = sizeof(*coded_packet); | |
1072 | int header_add = coded_size - unicast_size; | |
1073 | ||
7351a482 SW |
1074 | /* TODO: do we need to consider the outgoing interface for |
1075 | * coded packets? | |
1076 | */ | |
1077 | router_neigh = batadv_orig_router_get(neigh_node->orig_node, | |
1078 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1079 | if (!router_neigh) |
1080 | goto out; | |
1081 | ||
89652331 SW |
1082 | router_neigh_ifinfo = batadv_neigh_ifinfo_get(router_neigh, |
1083 | BATADV_IF_DEFAULT); | |
1084 | if (!router_neigh_ifinfo) | |
1085 | goto out; | |
1086 | ||
3c12de9a | 1087 | neigh_tmp = nc_packet->neigh_node; |
7351a482 SW |
1088 | router_coding = batadv_orig_router_get(neigh_tmp->orig_node, |
1089 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1090 | if (!router_coding) |
1091 | goto out; | |
1092 | ||
89652331 SW |
1093 | router_coding_ifinfo = batadv_neigh_ifinfo_get(router_coding, |
1094 | BATADV_IF_DEFAULT); | |
1095 | if (!router_coding_ifinfo) | |
1096 | goto out; | |
1097 | ||
1098 | tq_tmp = router_neigh_ifinfo->bat_iv.tq_avg; | |
1099 | tq_weighted_neigh = batadv_nc_random_weight_tq(tq_tmp); | |
1100 | tq_tmp = router_coding_ifinfo->bat_iv.tq_avg; | |
1101 | tq_weighted_coding = batadv_nc_random_weight_tq(tq_tmp); | |
3c12de9a MH |
1102 | |
1103 | /* Select one destination for the MAC-header dst-field based on | |
1104 | * weighted TQ-values. | |
1105 | */ | |
1106 | if (tq_weighted_neigh >= tq_weighted_coding) { | |
1107 | /* Destination from nc_packet is selected for MAC-header */ | |
95d39278 | 1108 | first_dest = nc_packet->neigh_node; |
3c12de9a | 1109 | first_source = nc_packet->nc_path->prev_hop; |
95d39278 | 1110 | second_dest = neigh_node; |
3c12de9a MH |
1111 | second_source = ethhdr->h_source; |
1112 | packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1113 | packet2 = (struct batadv_unicast_packet *)skb->data; | |
1114 | packet_id1 = nc_packet->packet_id; | |
1115 | packet_id2 = batadv_skb_crc32(skb, | |
1116 | skb->data + sizeof(*packet2)); | |
1117 | } else { | |
1118 | /* Destination for skb is selected for MAC-header */ | |
95d39278 | 1119 | first_dest = neigh_node; |
3c12de9a | 1120 | first_source = ethhdr->h_source; |
95d39278 | 1121 | second_dest = nc_packet->neigh_node; |
3c12de9a MH |
1122 | second_source = nc_packet->nc_path->prev_hop; |
1123 | packet1 = (struct batadv_unicast_packet *)skb->data; | |
1124 | packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1125 | packet_id1 = batadv_skb_crc32(skb, | |
1126 | skb->data + sizeof(*packet1)); | |
1127 | packet_id2 = nc_packet->packet_id; | |
1128 | } | |
1129 | ||
1130 | /* Instead of zero padding the smallest data buffer, we | |
1131 | * code into the largest. | |
1132 | */ | |
1133 | if (skb->len <= nc_packet->skb->len) { | |
1134 | skb_dest = nc_packet->skb; | |
1135 | skb_src = skb; | |
1136 | } else { | |
1137 | skb_dest = skb; | |
1138 | skb_src = nc_packet->skb; | |
1139 | } | |
1140 | ||
1141 | /* coding_len is used when decoding the packet shorter packet */ | |
1142 | coding_len = skb_src->len - unicast_size; | |
1143 | ||
1144 | if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) | |
1145 | goto out; | |
1146 | ||
1147 | skb_push(skb_dest, header_add); | |
1148 | ||
1149 | coded_packet = (struct batadv_coded_packet *)skb_dest->data; | |
1150 | skb_reset_mac_header(skb_dest); | |
1151 | ||
a40d9b07 SW |
1152 | coded_packet->packet_type = BATADV_CODED; |
1153 | coded_packet->version = BATADV_COMPAT_VERSION; | |
1154 | coded_packet->ttl = packet1->ttl; | |
3c12de9a MH |
1155 | |
1156 | /* Info about first unicast packet */ | |
8fdd0153 AQ |
1157 | ether_addr_copy(coded_packet->first_source, first_source); |
1158 | ether_addr_copy(coded_packet->first_orig_dest, packet1->dest); | |
3c12de9a MH |
1159 | coded_packet->first_crc = packet_id1; |
1160 | coded_packet->first_ttvn = packet1->ttvn; | |
1161 | ||
1162 | /* Info about second unicast packet */ | |
95d39278 | 1163 | ether_addr_copy(coded_packet->second_dest, second_dest->addr); |
8fdd0153 AQ |
1164 | ether_addr_copy(coded_packet->second_source, second_source); |
1165 | ether_addr_copy(coded_packet->second_orig_dest, packet2->dest); | |
3c12de9a | 1166 | coded_packet->second_crc = packet_id2; |
a40d9b07 | 1167 | coded_packet->second_ttl = packet2->ttl; |
3c12de9a MH |
1168 | coded_packet->second_ttvn = packet2->ttvn; |
1169 | coded_packet->coded_len = htons(coding_len); | |
1170 | ||
1171 | /* This is where the magic happens: Code skb_src into skb_dest */ | |
1172 | batadv_nc_memxor(skb_dest->data + coded_size, | |
1173 | skb_src->data + unicast_size, coding_len); | |
1174 | ||
1175 | /* Update counters accordingly */ | |
1176 | if (BATADV_SKB_CB(skb_src)->decoded && | |
1177 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1178 | /* Both packets are recoded */ | |
1179 | count = skb_src->len + ETH_HLEN; | |
1180 | count += skb_dest->len + ETH_HLEN; | |
1181 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); | |
1182 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); | |
1183 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1184 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1185 | /* Both packets are newly coded */ | |
1186 | count = skb_src->len + ETH_HLEN; | |
1187 | count += skb_dest->len + ETH_HLEN; | |
1188 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); | |
1189 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); | |
1190 | } else if (BATADV_SKB_CB(skb_src)->decoded && | |
1191 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1192 | /* skb_src recoded and skb_dest is newly coded */ | |
1193 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1194 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1195 | skb_src->len + ETH_HLEN); | |
1196 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1197 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1198 | skb_dest->len + ETH_HLEN); | |
1199 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1200 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1201 | /* skb_src is newly coded and skb_dest is recoded */ | |
1202 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1203 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1204 | skb_src->len + ETH_HLEN); | |
1205 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1206 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1207 | skb_dest->len + ETH_HLEN); | |
1208 | } | |
1209 | ||
1210 | /* skb_src is now coded into skb_dest, so free it */ | |
1211 | kfree_skb(skb_src); | |
1212 | ||
1213 | /* avoid duplicate free of skb from nc_packet */ | |
1214 | nc_packet->skb = NULL; | |
1215 | batadv_nc_packet_free(nc_packet); | |
1216 | ||
1217 | /* Send the coded packet and return true */ | |
95d39278 | 1218 | batadv_send_unicast_skb(skb_dest, first_dest); |
3c12de9a MH |
1219 | res = true; |
1220 | out: | |
1221 | if (router_neigh) | |
25bb2509 | 1222 | batadv_neigh_node_put(router_neigh); |
3c12de9a | 1223 | if (router_coding) |
25bb2509 | 1224 | batadv_neigh_node_put(router_coding); |
89652331 | 1225 | if (router_neigh_ifinfo) |
044fa3ae | 1226 | batadv_neigh_ifinfo_put(router_neigh_ifinfo); |
89652331 | 1227 | if (router_coding_ifinfo) |
044fa3ae | 1228 | batadv_neigh_ifinfo_put(router_coding_ifinfo); |
3c12de9a MH |
1229 | return res; |
1230 | } | |
1231 | ||
1232 | /** | |
1233 | * batadv_nc_skb_coding_possible - true if a decoded skb is available at dst. | |
1234 | * @skb: data skb to forward | |
1235 | * @dst: destination mac address of the other skb to code with | |
1236 | * @src: source mac address of skb | |
1237 | * | |
1238 | * Whenever we network code a packet we have to check whether we received it in | |
1239 | * a network coded form. If so, we may not be able to use it for coding because | |
1240 | * some neighbors may also have received (overheard) the packet in the network | |
1241 | * coded form without being able to decode it. It is hard to know which of the | |
1242 | * neighboring nodes was able to decode the packet, therefore we can only | |
1243 | * re-code the packet if the source of the previous encoded packet is involved. | |
1244 | * Since the source encoded the packet we can be certain it has all necessary | |
1245 | * decode information. | |
1246 | * | |
62fe710f | 1247 | * Return: true if coding of a decoded packet is allowed. |
3c12de9a | 1248 | */ |
6b5e971a | 1249 | static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) |
3c12de9a MH |
1250 | { |
1251 | if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) | |
1252 | return false; | |
24820df1 | 1253 | return true; |
3c12de9a MH |
1254 | } |
1255 | ||
1256 | /** | |
1257 | * batadv_nc_path_search - Find the coding path matching in_nc_node and | |
1258 | * out_nc_node to retrieve a buffered packet that can be used for coding. | |
1259 | * @bat_priv: the bat priv with all the soft interface information | |
1260 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1261 | * @out_nc_node: pointer to skb source's neighbor nc node | |
1262 | * @skb: data skb to forward | |
1263 | * @eth_dst: next hop mac address of skb | |
1264 | * | |
62fe710f | 1265 | * Return: true if coding of a decoded skb is allowed. |
3c12de9a MH |
1266 | */ |
1267 | static struct batadv_nc_packet * | |
1268 | batadv_nc_path_search(struct batadv_priv *bat_priv, | |
1269 | struct batadv_nc_node *in_nc_node, | |
1270 | struct batadv_nc_node *out_nc_node, | |
1271 | struct sk_buff *skb, | |
6b5e971a | 1272 | u8 *eth_dst) |
3c12de9a MH |
1273 | { |
1274 | struct batadv_nc_path *nc_path, nc_path_key; | |
1275 | struct batadv_nc_packet *nc_packet_out = NULL; | |
1276 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
1277 | struct batadv_hashtable *hash = bat_priv->nc.coding_hash; | |
1278 | int idx; | |
1279 | ||
1280 | if (!hash) | |
1281 | return NULL; | |
1282 | ||
1283 | /* Create almost path key */ | |
1284 | batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, | |
1285 | out_nc_node->addr); | |
1286 | idx = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1287 | ||
1288 | /* Check for coding opportunities in this nc_path */ | |
1289 | rcu_read_lock(); | |
1290 | hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { | |
1291 | if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) | |
1292 | continue; | |
1293 | ||
1294 | if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) | |
1295 | continue; | |
1296 | ||
1297 | spin_lock_bh(&nc_path->packet_list_lock); | |
1298 | if (list_empty(&nc_path->packet_list)) { | |
1299 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1300 | continue; | |
1301 | } | |
1302 | ||
1303 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
1304 | &nc_path->packet_list, list) { | |
1305 | if (!batadv_nc_skb_coding_possible(nc_packet->skb, | |
1306 | eth_dst, | |
1307 | in_nc_node->addr)) | |
1308 | continue; | |
1309 | ||
1310 | /* Coding opportunity is found! */ | |
1311 | list_del(&nc_packet->list); | |
1312 | nc_packet_out = nc_packet; | |
1313 | break; | |
1314 | } | |
1315 | ||
1316 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1317 | break; | |
1318 | } | |
1319 | rcu_read_unlock(); | |
1320 | ||
1321 | return nc_packet_out; | |
1322 | } | |
1323 | ||
1324 | /** | |
1325 | * batadv_nc_skb_src_search - Loops through the list of neighoring nodes of the | |
1326 | * skb's sender (may be equal to the originator). | |
1327 | * @bat_priv: the bat priv with all the soft interface information | |
1328 | * @skb: data skb to forward | |
1329 | * @eth_dst: next hop mac address of skb | |
1330 | * @eth_src: source mac address of skb | |
1331 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1332 | * | |
62fe710f | 1333 | * Return: an nc packet if a suitable coding packet was found, NULL otherwise. |
3c12de9a MH |
1334 | */ |
1335 | static struct batadv_nc_packet * | |
1336 | batadv_nc_skb_src_search(struct batadv_priv *bat_priv, | |
1337 | struct sk_buff *skb, | |
6b5e971a SE |
1338 | u8 *eth_dst, |
1339 | u8 *eth_src, | |
3c12de9a MH |
1340 | struct batadv_nc_node *in_nc_node) |
1341 | { | |
1342 | struct batadv_orig_node *orig_node; | |
1343 | struct batadv_nc_node *out_nc_node; | |
1344 | struct batadv_nc_packet *nc_packet = NULL; | |
1345 | ||
1346 | orig_node = batadv_orig_hash_find(bat_priv, eth_src); | |
1347 | if (!orig_node) | |
1348 | return NULL; | |
1349 | ||
1350 | rcu_read_lock(); | |
1351 | list_for_each_entry_rcu(out_nc_node, | |
1352 | &orig_node->out_coding_list, list) { | |
1353 | /* Check if the skb is decoded and if recoding is possible */ | |
1354 | if (!batadv_nc_skb_coding_possible(skb, | |
1355 | out_nc_node->addr, eth_src)) | |
1356 | continue; | |
1357 | ||
1358 | /* Search for an opportunity in this nc_path */ | |
1359 | nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, | |
1360 | out_nc_node, skb, eth_dst); | |
1361 | if (nc_packet) | |
1362 | break; | |
1363 | } | |
1364 | rcu_read_unlock(); | |
1365 | ||
5d967310 | 1366 | batadv_orig_node_put(orig_node); |
3c12de9a MH |
1367 | return nc_packet; |
1368 | } | |
1369 | ||
612d2b4f MH |
1370 | /** |
1371 | * batadv_nc_skb_store_before_coding - set the ethernet src and dst of the | |
1372 | * unicast skb before it is stored for use in later decoding | |
1373 | * @bat_priv: the bat priv with all the soft interface information | |
1374 | * @skb: data skb to store | |
1375 | * @eth_dst_new: new destination mac address of skb | |
1376 | */ | |
1377 | static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, | |
1378 | struct sk_buff *skb, | |
6b5e971a | 1379 | u8 *eth_dst_new) |
612d2b4f MH |
1380 | { |
1381 | struct ethhdr *ethhdr; | |
1382 | ||
1383 | /* Copy skb header to change the mac header */ | |
bad93e9d | 1384 | skb = pskb_copy_for_clone(skb, GFP_ATOMIC); |
612d2b4f MH |
1385 | if (!skb) |
1386 | return; | |
1387 | ||
1388 | /* Set the mac header as if we actually sent the packet uncoded */ | |
7ed4be95 | 1389 | ethhdr = eth_hdr(skb); |
8fdd0153 AQ |
1390 | ether_addr_copy(ethhdr->h_source, ethhdr->h_dest); |
1391 | ether_addr_copy(ethhdr->h_dest, eth_dst_new); | |
612d2b4f MH |
1392 | |
1393 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1394 | skb_push(skb, ETH_HLEN); | |
1395 | ||
1396 | /* Add the packet to the decoding packet pool */ | |
1397 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1398 | ||
1399 | /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free | |
1400 | * our ref | |
1401 | */ | |
1402 | kfree_skb(skb); | |
1403 | } | |
1404 | ||
3c12de9a MH |
1405 | /** |
1406 | * batadv_nc_skb_dst_search - Loops through list of neighboring nodes to dst. | |
1407 | * @skb: data skb to forward | |
1408 | * @neigh_node: next hop to forward packet to | |
1409 | * @ethhdr: pointer to the ethernet header inside the skb | |
1410 | * | |
1411 | * Loops through list of neighboring nodes the next hop has a good connection to | |
1412 | * (receives OGMs with a sufficient quality). We need to find a neighbor of our | |
1413 | * next hop that potentially sent a packet which our next hop also received | |
1414 | * (overheard) and has stored for later decoding. | |
1415 | * | |
62fe710f | 1416 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
3c12de9a MH |
1417 | */ |
1418 | static bool batadv_nc_skb_dst_search(struct sk_buff *skb, | |
1419 | struct batadv_neigh_node *neigh_node, | |
1420 | struct ethhdr *ethhdr) | |
1421 | { | |
1422 | struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1423 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1424 | struct batadv_orig_node *orig_node = neigh_node->orig_node; | |
1425 | struct batadv_nc_node *nc_node; | |
1426 | struct batadv_nc_packet *nc_packet = NULL; | |
1427 | ||
1428 | rcu_read_lock(); | |
1429 | list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { | |
1430 | /* Search for coding opportunity with this in_nc_node */ | |
1431 | nc_packet = batadv_nc_skb_src_search(bat_priv, skb, | |
1432 | neigh_node->addr, | |
1433 | ethhdr->h_source, nc_node); | |
1434 | ||
1435 | /* Opportunity was found, so stop searching */ | |
1436 | if (nc_packet) | |
1437 | break; | |
1438 | } | |
1439 | rcu_read_unlock(); | |
1440 | ||
1441 | if (!nc_packet) | |
1442 | return false; | |
1443 | ||
612d2b4f MH |
1444 | /* Save packets for later decoding */ |
1445 | batadv_nc_skb_store_before_coding(bat_priv, skb, | |
1446 | neigh_node->addr); | |
1447 | batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, | |
1448 | nc_packet->neigh_node->addr); | |
1449 | ||
3c12de9a MH |
1450 | /* Code and send packets */ |
1451 | if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, | |
1452 | neigh_node)) | |
1453 | return true; | |
1454 | ||
1455 | /* out of mem ? Coding failed - we have to free the buffered packet | |
1456 | * to avoid memleaks. The skb passed as argument will be dealt with | |
1457 | * by the calling function. | |
1458 | */ | |
1459 | batadv_nc_send_packet(nc_packet); | |
1460 | return false; | |
1461 | } | |
1462 | ||
95332477 MH |
1463 | /** |
1464 | * batadv_nc_skb_add_to_path - buffer skb for later encoding / decoding | |
1465 | * @skb: skb to add to path | |
1466 | * @nc_path: path to add skb to | |
1467 | * @neigh_node: next hop to forward packet to | |
1468 | * @packet_id: checksum to identify packet | |
1469 | * | |
62fe710f | 1470 | * Return: true if the packet was buffered or false in case of an error. |
95332477 MH |
1471 | */ |
1472 | static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, | |
1473 | struct batadv_nc_path *nc_path, | |
1474 | struct batadv_neigh_node *neigh_node, | |
1475 | __be32 packet_id) | |
1476 | { | |
1477 | struct batadv_nc_packet *nc_packet; | |
1478 | ||
1479 | nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); | |
1480 | if (!nc_packet) | |
1481 | return false; | |
1482 | ||
1483 | /* Initialize nc_packet */ | |
1484 | nc_packet->timestamp = jiffies; | |
1485 | nc_packet->packet_id = packet_id; | |
1486 | nc_packet->skb = skb; | |
1487 | nc_packet->neigh_node = neigh_node; | |
1488 | nc_packet->nc_path = nc_path; | |
1489 | ||
1490 | /* Add coding packet to list */ | |
1491 | spin_lock_bh(&nc_path->packet_list_lock); | |
1492 | list_add_tail(&nc_packet->list, &nc_path->packet_list); | |
1493 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1494 | ||
1495 | return true; | |
1496 | } | |
1497 | ||
1498 | /** | |
1499 | * batadv_nc_skb_forward - try to code a packet or add it to the coding packet | |
1500 | * buffer | |
1501 | * @skb: data skb to forward | |
1502 | * @neigh_node: next hop to forward packet to | |
95332477 | 1503 | * |
62fe710f | 1504 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
95332477 MH |
1505 | */ |
1506 | bool batadv_nc_skb_forward(struct sk_buff *skb, | |
e91ecfc6 | 1507 | struct batadv_neigh_node *neigh_node) |
95332477 MH |
1508 | { |
1509 | const struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1510 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1511 | struct batadv_unicast_packet *packet; | |
1512 | struct batadv_nc_path *nc_path; | |
e91ecfc6 | 1513 | struct ethhdr *ethhdr = eth_hdr(skb); |
95332477 MH |
1514 | __be32 packet_id; |
1515 | u8 *payload; | |
1516 | ||
1517 | /* Check if network coding is enabled */ | |
1518 | if (!atomic_read(&bat_priv->network_coding)) | |
1519 | goto out; | |
1520 | ||
1521 | /* We only handle unicast packets */ | |
1522 | payload = skb_network_header(skb); | |
1523 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1524 | if (packet->packet_type != BATADV_UNICAST) |
95332477 MH |
1525 | goto out; |
1526 | ||
3c12de9a MH |
1527 | /* Try to find a coding opportunity and send the skb if one is found */ |
1528 | if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) | |
1529 | return true; | |
1530 | ||
95332477 MH |
1531 | /* Find or create a nc_path for this src-dst pair */ |
1532 | nc_path = batadv_nc_get_path(bat_priv, | |
1533 | bat_priv->nc.coding_hash, | |
1534 | ethhdr->h_source, | |
1535 | neigh_node->addr); | |
1536 | ||
1537 | if (!nc_path) | |
1538 | goto out; | |
1539 | ||
1540 | /* Add skb to nc_path */ | |
1541 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1542 | if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) | |
1543 | goto free_nc_path; | |
1544 | ||
1545 | /* Packet is consumed */ | |
1546 | return true; | |
1547 | ||
1548 | free_nc_path: | |
5fff2825 | 1549 | batadv_nc_path_put(nc_path); |
95332477 MH |
1550 | out: |
1551 | /* Packet is not consumed */ | |
1552 | return false; | |
1553 | } | |
1554 | ||
612d2b4f MH |
1555 | /** |
1556 | * batadv_nc_skb_store_for_decoding - save a clone of the skb which can be used | |
1557 | * when decoding coded packets | |
1558 | * @bat_priv: the bat priv with all the soft interface information | |
1559 | * @skb: data skb to store | |
1560 | */ | |
1561 | void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, | |
1562 | struct sk_buff *skb) | |
1563 | { | |
1564 | struct batadv_unicast_packet *packet; | |
1565 | struct batadv_nc_path *nc_path; | |
7ed4be95 | 1566 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f MH |
1567 | __be32 packet_id; |
1568 | u8 *payload; | |
1569 | ||
1570 | /* Check if network coding is enabled */ | |
1571 | if (!atomic_read(&bat_priv->network_coding)) | |
1572 | goto out; | |
1573 | ||
1574 | /* Check for supported packet type */ | |
1575 | payload = skb_network_header(skb); | |
1576 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1577 | if (packet->packet_type != BATADV_UNICAST) |
612d2b4f MH |
1578 | goto out; |
1579 | ||
1580 | /* Find existing nc_path or create a new */ | |
1581 | nc_path = batadv_nc_get_path(bat_priv, | |
1582 | bat_priv->nc.decoding_hash, | |
1583 | ethhdr->h_source, | |
1584 | ethhdr->h_dest); | |
1585 | ||
1586 | if (!nc_path) | |
1587 | goto out; | |
1588 | ||
1589 | /* Clone skb and adjust skb->data to point at batman header */ | |
1590 | skb = skb_clone(skb, GFP_ATOMIC); | |
1591 | if (unlikely(!skb)) | |
1592 | goto free_nc_path; | |
1593 | ||
1594 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) | |
1595 | goto free_skb; | |
1596 | ||
1597 | if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) | |
1598 | goto free_skb; | |
1599 | ||
1600 | /* Add skb to nc_path */ | |
1601 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1602 | if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) | |
1603 | goto free_skb; | |
1604 | ||
1605 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); | |
1606 | return; | |
1607 | ||
1608 | free_skb: | |
1609 | kfree_skb(skb); | |
1610 | free_nc_path: | |
5fff2825 | 1611 | batadv_nc_path_put(nc_path); |
612d2b4f MH |
1612 | out: |
1613 | return; | |
1614 | } | |
1615 | ||
1616 | /** | |
1617 | * batadv_nc_skb_store_sniffed_unicast - check if a received unicast packet | |
1618 | * should be saved in the decoding buffer and, if so, store it there | |
1619 | * @bat_priv: the bat priv with all the soft interface information | |
1620 | * @skb: unicast skb to store | |
1621 | */ | |
1622 | void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, | |
1623 | struct sk_buff *skb) | |
1624 | { | |
7ed4be95 | 1625 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f | 1626 | |
6e0895c2 | 1627 | if (batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
612d2b4f MH |
1628 | return; |
1629 | ||
1630 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1631 | skb_push(skb, ETH_HLEN); | |
1632 | ||
1633 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1634 | } | |
1635 | ||
2df5278b MH |
1636 | /** |
1637 | * batadv_nc_skb_decode_packet - decode given skb using the decode data stored | |
1638 | * in nc_packet | |
6e0895c2 | 1639 | * @bat_priv: the bat priv with all the soft interface information |
2df5278b MH |
1640 | * @skb: unicast skb to decode |
1641 | * @nc_packet: decode data needed to decode the skb | |
1642 | * | |
62fe710f | 1643 | * Return: pointer to decoded unicast packet if the packet was decoded or NULL |
2df5278b MH |
1644 | * in case of an error. |
1645 | */ | |
1646 | static struct batadv_unicast_packet * | |
6e0895c2 | 1647 | batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, |
2df5278b MH |
1648 | struct batadv_nc_packet *nc_packet) |
1649 | { | |
1650 | const int h_size = sizeof(struct batadv_unicast_packet); | |
1651 | const int h_diff = sizeof(struct batadv_coded_packet) - h_size; | |
1652 | struct batadv_unicast_packet *unicast_packet; | |
1653 | struct batadv_coded_packet coded_packet_tmp; | |
1654 | struct ethhdr *ethhdr, ethhdr_tmp; | |
6b5e971a | 1655 | u8 *orig_dest, ttl, ttvn; |
2df5278b | 1656 | unsigned int coding_len; |
7da19971 | 1657 | int err; |
2df5278b MH |
1658 | |
1659 | /* Save headers temporarily */ | |
1660 | memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp)); | |
1661 | memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp)); | |
1662 | ||
1663 | if (skb_cow(skb, 0) < 0) | |
1664 | return NULL; | |
1665 | ||
1666 | if (unlikely(!skb_pull_rcsum(skb, h_diff))) | |
1667 | return NULL; | |
1668 | ||
1669 | /* Data points to batman header, so set mac header 14 bytes before | |
1670 | * and network to data | |
1671 | */ | |
1672 | skb_set_mac_header(skb, -ETH_HLEN); | |
1673 | skb_reset_network_header(skb); | |
1674 | ||
1675 | /* Reconstruct original mac header */ | |
7ed4be95 | 1676 | ethhdr = eth_hdr(skb); |
abae9479 | 1677 | *ethhdr = ethhdr_tmp; |
2df5278b MH |
1678 | |
1679 | /* Select the correct unicast header information based on the location | |
1680 | * of our mac address in the coded_packet header | |
1681 | */ | |
6e0895c2 | 1682 | if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) { |
2df5278b MH |
1683 | /* If we are the second destination the packet was overheard, |
1684 | * so the Ethernet address must be copied to h_dest and | |
1685 | * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST | |
1686 | */ | |
8fdd0153 | 1687 | ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest); |
2df5278b MH |
1688 | skb->pkt_type = PACKET_HOST; |
1689 | ||
1690 | orig_dest = coded_packet_tmp.second_orig_dest; | |
1691 | ttl = coded_packet_tmp.second_ttl; | |
1692 | ttvn = coded_packet_tmp.second_ttvn; | |
1693 | } else { | |
1694 | orig_dest = coded_packet_tmp.first_orig_dest; | |
a40d9b07 | 1695 | ttl = coded_packet_tmp.ttl; |
2df5278b MH |
1696 | ttvn = coded_packet_tmp.first_ttvn; |
1697 | } | |
1698 | ||
1699 | coding_len = ntohs(coded_packet_tmp.coded_len); | |
1700 | ||
1701 | if (coding_len > skb->len) | |
1702 | return NULL; | |
1703 | ||
1704 | /* Here the magic is reversed: | |
1705 | * extract the missing packet from the received coded packet | |
1706 | */ | |
1707 | batadv_nc_memxor(skb->data + h_size, | |
1708 | nc_packet->skb->data + h_size, | |
1709 | coding_len); | |
1710 | ||
1711 | /* Resize decoded skb if decoded with larger packet */ | |
7da19971 ML |
1712 | if (nc_packet->skb->len > coding_len + h_size) { |
1713 | err = pskb_trim_rcsum(skb, coding_len + h_size); | |
1714 | if (err) | |
1715 | return NULL; | |
1716 | } | |
2df5278b MH |
1717 | |
1718 | /* Create decoded unicast packet */ | |
1719 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
a40d9b07 SW |
1720 | unicast_packet->packet_type = BATADV_UNICAST; |
1721 | unicast_packet->version = BATADV_COMPAT_VERSION; | |
1722 | unicast_packet->ttl = ttl; | |
8fdd0153 | 1723 | ether_addr_copy(unicast_packet->dest, orig_dest); |
2df5278b MH |
1724 | unicast_packet->ttvn = ttvn; |
1725 | ||
1726 | batadv_nc_packet_free(nc_packet); | |
1727 | return unicast_packet; | |
1728 | } | |
1729 | ||
1730 | /** | |
1731 | * batadv_nc_find_decoding_packet - search through buffered decoding data to | |
1732 | * find the data needed to decode the coded packet | |
1733 | * @bat_priv: the bat priv with all the soft interface information | |
1734 | * @ethhdr: pointer to the ethernet header inside the coded packet | |
1735 | * @coded: coded packet we try to find decode data for | |
1736 | * | |
62fe710f | 1737 | * Return: pointer to nc packet if the needed data was found or NULL otherwise. |
2df5278b MH |
1738 | */ |
1739 | static struct batadv_nc_packet * | |
1740 | batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, | |
1741 | struct ethhdr *ethhdr, | |
1742 | struct batadv_coded_packet *coded) | |
1743 | { | |
1744 | struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; | |
1745 | struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; | |
1746 | struct batadv_nc_path *nc_path, nc_path_key; | |
6b5e971a | 1747 | u8 *dest, *source; |
2df5278b MH |
1748 | __be32 packet_id; |
1749 | int index; | |
1750 | ||
1751 | if (!hash) | |
1752 | return NULL; | |
1753 | ||
1754 | /* Select the correct packet id based on the location of our mac-addr */ | |
1755 | dest = ethhdr->h_source; | |
6e0895c2 | 1756 | if (!batadv_is_my_mac(bat_priv, coded->second_dest)) { |
2df5278b MH |
1757 | source = coded->second_source; |
1758 | packet_id = coded->second_crc; | |
1759 | } else { | |
1760 | source = coded->first_source; | |
1761 | packet_id = coded->first_crc; | |
1762 | } | |
1763 | ||
1764 | batadv_nc_hash_key_gen(&nc_path_key, source, dest); | |
1765 | index = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1766 | ||
1767 | /* Search for matching coding path */ | |
1768 | rcu_read_lock(); | |
1769 | hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { | |
1770 | /* Find matching nc_packet */ | |
1771 | spin_lock_bh(&nc_path->packet_list_lock); | |
1772 | list_for_each_entry(tmp_nc_packet, | |
1773 | &nc_path->packet_list, list) { | |
1774 | if (packet_id == tmp_nc_packet->packet_id) { | |
1775 | list_del(&tmp_nc_packet->list); | |
1776 | ||
1777 | nc_packet = tmp_nc_packet; | |
1778 | break; | |
1779 | } | |
1780 | } | |
1781 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1782 | ||
1783 | if (nc_packet) | |
1784 | break; | |
1785 | } | |
1786 | rcu_read_unlock(); | |
1787 | ||
1788 | if (!nc_packet) | |
1789 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
1790 | "No decoding packet found for %u\n", packet_id); | |
1791 | ||
1792 | return nc_packet; | |
1793 | } | |
1794 | ||
1795 | /** | |
1796 | * batadv_nc_recv_coded_packet - try to decode coded packet and enqueue the | |
1797 | * resulting unicast packet | |
1798 | * @skb: incoming coded packet | |
1799 | * @recv_if: pointer to interface this packet was received on | |
672e7978 SE |
1800 | * |
1801 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1802 | * otherwise. | |
2df5278b MH |
1803 | */ |
1804 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, | |
1805 | struct batadv_hard_iface *recv_if) | |
1806 | { | |
1807 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1808 | struct batadv_unicast_packet *unicast_packet; | |
1809 | struct batadv_coded_packet *coded_packet; | |
1810 | struct batadv_nc_packet *nc_packet; | |
1811 | struct ethhdr *ethhdr; | |
1812 | int hdr_size = sizeof(*coded_packet); | |
1813 | ||
1814 | /* Check if network coding is enabled */ | |
1815 | if (!atomic_read(&bat_priv->network_coding)) | |
1816 | return NET_RX_DROP; | |
1817 | ||
1818 | /* Make sure we can access (and remove) header */ | |
1819 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1820 | return NET_RX_DROP; | |
1821 | ||
1822 | coded_packet = (struct batadv_coded_packet *)skb->data; | |
7ed4be95 | 1823 | ethhdr = eth_hdr(skb); |
2df5278b MH |
1824 | |
1825 | /* Verify frame is destined for us */ | |
6e0895c2 DM |
1826 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) && |
1827 | !batadv_is_my_mac(bat_priv, coded_packet->second_dest)) | |
2df5278b MH |
1828 | return NET_RX_DROP; |
1829 | ||
1830 | /* Update stat counter */ | |
6e0895c2 | 1831 | if (batadv_is_my_mac(bat_priv, coded_packet->second_dest)) |
2df5278b MH |
1832 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED); |
1833 | ||
1834 | nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr, | |
1835 | coded_packet); | |
1836 | if (!nc_packet) { | |
1837 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
1838 | return NET_RX_DROP; | |
1839 | } | |
1840 | ||
1841 | /* Make skb's linear, because decoding accesses the entire buffer */ | |
1842 | if (skb_linearize(skb) < 0) | |
1843 | goto free_nc_packet; | |
1844 | ||
1845 | if (skb_linearize(nc_packet->skb) < 0) | |
1846 | goto free_nc_packet; | |
1847 | ||
1848 | /* Decode the packet */ | |
6e0895c2 | 1849 | unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet); |
2df5278b MH |
1850 | if (!unicast_packet) { |
1851 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
1852 | goto free_nc_packet; | |
1853 | } | |
1854 | ||
1855 | /* Mark packet as decoded to do correct recoding when forwarding */ | |
1856 | BATADV_SKB_CB(skb)->decoded = true; | |
1857 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE); | |
1858 | batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES, | |
1859 | skb->len + ETH_HLEN); | |
1860 | return batadv_recv_unicast_packet(skb, recv_if); | |
1861 | ||
1862 | free_nc_packet: | |
1863 | batadv_nc_packet_free(nc_packet); | |
1864 | return NET_RX_DROP; | |
1865 | } | |
1866 | ||
d353d8d4 | 1867 | /** |
6c519bad | 1868 | * batadv_nc_mesh_free - clean up network coding memory |
d353d8d4 MH |
1869 | * @bat_priv: the bat priv with all the soft interface information |
1870 | */ | |
6c519bad | 1871 | void batadv_nc_mesh_free(struct batadv_priv *bat_priv) |
d353d8d4 | 1872 | { |
3f4841ff ML |
1873 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); |
1874 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
d353d8d4 | 1875 | cancel_delayed_work_sync(&bat_priv->nc.work); |
612d2b4f | 1876 | |
95332477 MH |
1877 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); |
1878 | batadv_hash_destroy(bat_priv->nc.coding_hash); | |
612d2b4f MH |
1879 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); |
1880 | batadv_hash_destroy(bat_priv->nc.decoding_hash); | |
d353d8d4 | 1881 | } |
d56b1705 MH |
1882 | |
1883 | /** | |
1884 | * batadv_nc_nodes_seq_print_text - print the nc node information | |
1885 | * @seq: seq file to print on | |
1886 | * @offset: not used | |
672e7978 SE |
1887 | * |
1888 | * Return: always 0 | |
d56b1705 MH |
1889 | */ |
1890 | int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) | |
1891 | { | |
1892 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1893 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1894 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1895 | struct batadv_hard_iface *primary_if; | |
1896 | struct hlist_head *head; | |
1897 | struct batadv_orig_node *orig_node; | |
1898 | struct batadv_nc_node *nc_node; | |
1899 | int i; | |
1900 | ||
1901 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1902 | if (!primary_if) | |
1903 | goto out; | |
1904 | ||
1905 | /* Traverse list of originators */ | |
1906 | for (i = 0; i < hash->size; i++) { | |
1907 | head = &hash->table[i]; | |
1908 | ||
1909 | /* For each orig_node in this bin */ | |
1910 | rcu_read_lock(); | |
1911 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
aa27c312 ML |
1912 | /* no need to print the orig node if it does not have |
1913 | * network coding neighbors | |
1914 | */ | |
1915 | if (list_empty(&orig_node->in_coding_list) && | |
1916 | list_empty(&orig_node->out_coding_list)) | |
1917 | continue; | |
1918 | ||
d56b1705 MH |
1919 | seq_printf(seq, "Node: %pM\n", orig_node->orig); |
1920 | ||
0c814653 | 1921 | seq_puts(seq, " Ingoing: "); |
d56b1705 MH |
1922 | /* For each in_nc_node to this orig_node */ |
1923 | list_for_each_entry_rcu(nc_node, | |
1924 | &orig_node->in_coding_list, | |
1925 | list) | |
1926 | seq_printf(seq, "%pM ", | |
1927 | nc_node->addr); | |
0c814653 | 1928 | seq_puts(seq, "\n"); |
d56b1705 | 1929 | |
0c814653 | 1930 | seq_puts(seq, " Outgoing: "); |
d56b1705 MH |
1931 | /* For out_nc_node to this orig_node */ |
1932 | list_for_each_entry_rcu(nc_node, | |
1933 | &orig_node->out_coding_list, | |
1934 | list) | |
1935 | seq_printf(seq, "%pM ", | |
1936 | nc_node->addr); | |
0c814653 | 1937 | seq_puts(seq, "\n\n"); |
d56b1705 MH |
1938 | } |
1939 | rcu_read_unlock(); | |
1940 | } | |
1941 | ||
1942 | out: | |
1943 | if (primary_if) | |
82047ad7 | 1944 | batadv_hardif_put(primary_if); |
d56b1705 MH |
1945 | return 0; |
1946 | } | |
1947 | ||
1948 | /** | |
1949 | * batadv_nc_init_debugfs - create nc folder and related files in debugfs | |
1950 | * @bat_priv: the bat priv with all the soft interface information | |
672e7978 SE |
1951 | * |
1952 | * Return: 0 on success or negative error number in case of failure | |
d56b1705 MH |
1953 | */ |
1954 | int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) | |
1955 | { | |
1956 | struct dentry *nc_dir, *file; | |
1957 | ||
1958 | nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir); | |
1959 | if (!nc_dir) | |
1960 | goto out; | |
1961 | ||
1962 | file = debugfs_create_u8("min_tq", S_IRUGO | S_IWUSR, nc_dir, | |
1963 | &bat_priv->nc.min_tq); | |
1964 | if (!file) | |
1965 | goto out; | |
1966 | ||
95332477 MH |
1967 | file = debugfs_create_u32("max_fwd_delay", S_IRUGO | S_IWUSR, nc_dir, |
1968 | &bat_priv->nc.max_fwd_delay); | |
1969 | if (!file) | |
1970 | goto out; | |
1971 | ||
612d2b4f MH |
1972 | file = debugfs_create_u32("max_buffer_time", S_IRUGO | S_IWUSR, nc_dir, |
1973 | &bat_priv->nc.max_buffer_time); | |
1974 | if (!file) | |
1975 | goto out; | |
1976 | ||
d56b1705 MH |
1977 | return 0; |
1978 | ||
1979 | out: | |
1980 | return -ENOMEM; | |
1981 | } |