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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 | * | |
62fe710f | 513 | * Return: 1 if the two entry are the same, 0 otherwise |
95332477 MH |
514 | */ |
515 | static int batadv_nc_hash_compare(const struct hlist_node *node, | |
516 | const void *data2) | |
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 */ | |
524 | if (memcmp(nc_path1->prev_hop, nc_path2->prev_hop, | |
525 | sizeof(nc_path1->prev_hop)) != 0) | |
526 | return 0; | |
527 | ||
528 | if (memcmp(nc_path1->next_hop, nc_path2->next_hop, | |
529 | sizeof(nc_path1->next_hop)) != 0) | |
530 | return 0; | |
531 | ||
532 | return 1; | |
533 | } | |
534 | ||
535 | /** | |
536 | * batadv_nc_hash_find - search for an existing nc path and return it | |
537 | * @hash: hash table containing the nc path | |
538 | * @data: search key | |
539 | * | |
62fe710f | 540 | * Return: the nc_path if found, NULL otherwise. |
95332477 MH |
541 | */ |
542 | static struct batadv_nc_path * | |
543 | batadv_nc_hash_find(struct batadv_hashtable *hash, | |
544 | void *data) | |
545 | { | |
546 | struct hlist_head *head; | |
547 | struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; | |
548 | int index; | |
549 | ||
550 | if (!hash) | |
551 | return NULL; | |
552 | ||
553 | index = batadv_nc_hash_choose(data, hash->size); | |
554 | head = &hash->table[index]; | |
555 | ||
556 | rcu_read_lock(); | |
557 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
558 | if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) | |
559 | continue; | |
560 | ||
727e0cd5 | 561 | if (!kref_get_unless_zero(&nc_path->refcount)) |
95332477 MH |
562 | continue; |
563 | ||
564 | nc_path_tmp = nc_path; | |
565 | break; | |
566 | } | |
567 | rcu_read_unlock(); | |
568 | ||
569 | return nc_path_tmp; | |
570 | } | |
571 | ||
572 | /** | |
573 | * batadv_nc_send_packet - send non-coded packet and free nc_packet struct | |
574 | * @nc_packet: the nc packet to send | |
575 | */ | |
576 | static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) | |
577 | { | |
95d39278 | 578 | batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node); |
95332477 MH |
579 | nc_packet->skb = NULL; |
580 | batadv_nc_packet_free(nc_packet); | |
581 | } | |
582 | ||
612d2b4f MH |
583 | /** |
584 | * batadv_nc_sniffed_purge - Checks timestamp of given sniffed nc_packet. | |
585 | * @bat_priv: the bat priv with all the soft interface information | |
586 | * @nc_path: the nc path the packet belongs to | |
587 | * @nc_packet: the nc packet to be checked | |
588 | * | |
589 | * Checks whether the given sniffed (overheard) nc_packet has hit its buffering | |
590 | * timeout. If so, the packet is no longer kept and the entry deleted from the | |
591 | * queue. Has to be called with the appropriate locks. | |
592 | * | |
62fe710f | 593 | * Return: false as soon as the entry in the fifo queue has not been timed out |
612d2b4f MH |
594 | * yet and true otherwise. |
595 | */ | |
596 | static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, | |
597 | struct batadv_nc_path *nc_path, | |
598 | struct batadv_nc_packet *nc_packet) | |
599 | { | |
600 | unsigned long timeout = bat_priv->nc.max_buffer_time; | |
601 | bool res = false; | |
602 | ||
2c72d655 SE |
603 | lockdep_assert_held(&nc_path->packet_list_lock); |
604 | ||
612d2b4f MH |
605 | /* Packets are added to tail, so the remaining packets did not time |
606 | * out and we can stop processing the current queue | |
607 | */ | |
608 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
609 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
610 | goto out; | |
611 | ||
612 | /* purge nc packet */ | |
613 | list_del(&nc_packet->list); | |
614 | batadv_nc_packet_free(nc_packet); | |
615 | ||
616 | res = true; | |
617 | ||
618 | out: | |
619 | return res; | |
620 | } | |
621 | ||
95332477 MH |
622 | /** |
623 | * batadv_nc_fwd_flush - Checks the timestamp of the given nc packet. | |
624 | * @bat_priv: the bat priv with all the soft interface information | |
625 | * @nc_path: the nc path the packet belongs to | |
626 | * @nc_packet: the nc packet to be checked | |
627 | * | |
628 | * Checks whether the given nc packet has hit its forward timeout. If so, the | |
629 | * packet is no longer delayed, immediately sent and the entry deleted from the | |
630 | * queue. Has to be called with the appropriate locks. | |
631 | * | |
62fe710f | 632 | * Return: false as soon as the entry in the fifo queue has not been timed out |
95332477 MH |
633 | * yet and true otherwise. |
634 | */ | |
635 | static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, | |
636 | struct batadv_nc_path *nc_path, | |
637 | struct batadv_nc_packet *nc_packet) | |
638 | { | |
639 | unsigned long timeout = bat_priv->nc.max_fwd_delay; | |
640 | ||
2c72d655 SE |
641 | lockdep_assert_held(&nc_path->packet_list_lock); |
642 | ||
95332477 MH |
643 | /* Packets are added to tail, so the remaining packets did not time |
644 | * out and we can stop processing the current queue | |
645 | */ | |
646 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
647 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
648 | return false; | |
649 | ||
650 | /* Send packet */ | |
651 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); | |
652 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
653 | nc_packet->skb->len + ETH_HLEN); | |
654 | list_del(&nc_packet->list); | |
655 | batadv_nc_send_packet(nc_packet); | |
656 | ||
657 | return true; | |
658 | } | |
659 | ||
660 | /** | |
661 | * batadv_nc_process_nc_paths - traverse given nc packet pool and free timed out | |
662 | * nc packets | |
663 | * @bat_priv: the bat priv with all the soft interface information | |
664 | * @hash: to be processed hash table | |
665 | * @process_fn: Function called to process given nc packet. Should return true | |
666 | * to encourage this function to proceed with the next packet. | |
667 | * Otherwise the rest of the current queue is skipped. | |
668 | */ | |
669 | static void | |
670 | batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, | |
671 | struct batadv_hashtable *hash, | |
672 | bool (*process_fn)(struct batadv_priv *, | |
673 | struct batadv_nc_path *, | |
674 | struct batadv_nc_packet *)) | |
675 | { | |
676 | struct hlist_head *head; | |
677 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
678 | struct batadv_nc_path *nc_path; | |
679 | bool ret; | |
680 | int i; | |
681 | ||
682 | if (!hash) | |
683 | return; | |
684 | ||
685 | /* Loop hash table bins */ | |
686 | for (i = 0; i < hash->size; i++) { | |
687 | head = &hash->table[i]; | |
688 | ||
689 | /* Loop coding paths */ | |
690 | rcu_read_lock(); | |
691 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
692 | /* Loop packets */ | |
693 | spin_lock_bh(&nc_path->packet_list_lock); | |
694 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
695 | &nc_path->packet_list, list) { | |
696 | ret = process_fn(bat_priv, nc_path, nc_packet); | |
697 | if (!ret) | |
698 | break; | |
699 | } | |
700 | spin_unlock_bh(&nc_path->packet_list_lock); | |
701 | } | |
702 | rcu_read_unlock(); | |
703 | } | |
704 | } | |
705 | ||
d353d8d4 MH |
706 | /** |
707 | * batadv_nc_worker - periodic task for house keeping related to network coding | |
708 | * @work: kernel work struct | |
709 | */ | |
710 | static void batadv_nc_worker(struct work_struct *work) | |
711 | { | |
712 | struct delayed_work *delayed_work; | |
713 | struct batadv_priv_nc *priv_nc; | |
714 | struct batadv_priv *bat_priv; | |
95332477 | 715 | unsigned long timeout; |
d353d8d4 | 716 | |
4ba4bc0f | 717 | delayed_work = to_delayed_work(work); |
d353d8d4 MH |
718 | priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); |
719 | bat_priv = container_of(priv_nc, struct batadv_priv, nc); | |
720 | ||
d56b1705 | 721 | batadv_nc_purge_orig_hash(bat_priv); |
95332477 MH |
722 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, |
723 | batadv_nc_to_purge_nc_path_coding); | |
612d2b4f MH |
724 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, |
725 | batadv_nc_to_purge_nc_path_decoding); | |
95332477 MH |
726 | |
727 | timeout = bat_priv->nc.max_fwd_delay; | |
728 | ||
729 | if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { | |
730 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, | |
731 | batadv_nc_fwd_flush); | |
732 | bat_priv->nc.timestamp_fwd_flush = jiffies; | |
733 | } | |
d56b1705 | 734 | |
612d2b4f MH |
735 | if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, |
736 | bat_priv->nc.max_buffer_time)) { | |
737 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, | |
738 | batadv_nc_sniffed_purge); | |
739 | bat_priv->nc.timestamp_sniffed_purge = jiffies; | |
740 | } | |
741 | ||
d353d8d4 MH |
742 | /* Schedule a new check */ |
743 | batadv_nc_start_timer(bat_priv); | |
744 | } | |
745 | ||
d56b1705 MH |
746 | /** |
747 | * batadv_can_nc_with_orig - checks whether the given orig node is suitable for | |
748 | * coding or not | |
749 | * @bat_priv: the bat priv with all the soft interface information | |
750 | * @orig_node: neighboring orig node which may be used as nc candidate | |
751 | * @ogm_packet: incoming ogm packet also used for the checks | |
752 | * | |
62fe710f | 753 | * Return: true if: |
d56b1705 MH |
754 | * 1) The OGM must have the most recent sequence number. |
755 | * 2) The TTL must be decremented by one and only one. | |
756 | * 3) The OGM must be received from the first hop from orig_node. | |
757 | * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. | |
758 | */ | |
759 | static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, | |
760 | struct batadv_orig_node *orig_node, | |
761 | struct batadv_ogm_packet *ogm_packet) | |
762 | { | |
7351a482 | 763 | struct batadv_orig_ifinfo *orig_ifinfo; |
6b5e971a SE |
764 | u32 last_real_seqno; |
765 | u8 last_ttl; | |
7351a482 SW |
766 | |
767 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, BATADV_IF_DEFAULT); | |
768 | if (!orig_ifinfo) | |
d56b1705 | 769 | return false; |
7351a482 SW |
770 | |
771 | last_ttl = orig_ifinfo->last_ttl; | |
772 | last_real_seqno = orig_ifinfo->last_real_seqno; | |
35f94779 | 773 | batadv_orig_ifinfo_put(orig_ifinfo); |
7351a482 SW |
774 | |
775 | if (last_real_seqno != ntohl(ogm_packet->seqno)) | |
776 | return false; | |
777 | if (last_ttl != ogm_packet->ttl + 1) | |
d56b1705 MH |
778 | return false; |
779 | if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) | |
780 | return false; | |
781 | if (ogm_packet->tq < bat_priv->nc.min_tq) | |
782 | return false; | |
783 | ||
784 | return true; | |
785 | } | |
786 | ||
787 | /** | |
788 | * batadv_nc_find_nc_node - search for an existing nc node and return it | |
789 | * @orig_node: orig node originating the ogm packet | |
790 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
791 | * (can be equal to orig_node) | |
792 | * @in_coding: traverse incoming or outgoing network coding list | |
793 | * | |
62fe710f | 794 | * Return: the nc_node if found, NULL otherwise. |
d56b1705 MH |
795 | */ |
796 | static struct batadv_nc_node | |
797 | *batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, | |
798 | struct batadv_orig_node *orig_neigh_node, | |
799 | bool in_coding) | |
800 | { | |
801 | struct batadv_nc_node *nc_node, *nc_node_out = NULL; | |
802 | struct list_head *list; | |
803 | ||
804 | if (in_coding) | |
805 | list = &orig_neigh_node->in_coding_list; | |
806 | else | |
807 | list = &orig_neigh_node->out_coding_list; | |
808 | ||
809 | /* Traverse list of nc_nodes to orig_node */ | |
810 | rcu_read_lock(); | |
811 | list_for_each_entry_rcu(nc_node, list, list) { | |
812 | if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) | |
813 | continue; | |
814 | ||
daf99b48 | 815 | if (!kref_get_unless_zero(&nc_node->refcount)) |
d56b1705 MH |
816 | continue; |
817 | ||
818 | /* Found a match */ | |
819 | nc_node_out = nc_node; | |
820 | break; | |
821 | } | |
822 | rcu_read_unlock(); | |
823 | ||
824 | return nc_node_out; | |
825 | } | |
826 | ||
827 | /** | |
828 | * batadv_nc_get_nc_node - retrieves an nc node or creates the entry if it was | |
829 | * not found | |
830 | * @bat_priv: the bat priv with all the soft interface information | |
831 | * @orig_node: orig node originating the ogm packet | |
832 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
833 | * (can be equal to orig_node) | |
834 | * @in_coding: traverse incoming or outgoing network coding list | |
835 | * | |
62fe710f | 836 | * Return: the nc_node if found or created, NULL in case of an error. |
d56b1705 MH |
837 | */ |
838 | static struct batadv_nc_node | |
839 | *batadv_nc_get_nc_node(struct batadv_priv *bat_priv, | |
840 | struct batadv_orig_node *orig_node, | |
841 | struct batadv_orig_node *orig_neigh_node, | |
842 | bool in_coding) | |
843 | { | |
844 | struct batadv_nc_node *nc_node; | |
845 | spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ | |
846 | struct list_head *list; | |
847 | ||
848 | /* Check if nc_node is already added */ | |
849 | nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); | |
850 | ||
851 | /* Node found */ | |
852 | if (nc_node) | |
853 | return nc_node; | |
854 | ||
855 | nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); | |
856 | if (!nc_node) | |
857 | return NULL; | |
858 | ||
7c124391 | 859 | if (!kref_get_unless_zero(&orig_neigh_node->refcount)) |
d56b1705 MH |
860 | goto free; |
861 | ||
862 | /* Initialize nc_node */ | |
863 | INIT_LIST_HEAD(&nc_node->list); | |
8fdd0153 | 864 | ether_addr_copy(nc_node->addr, orig_node->orig); |
d56b1705 | 865 | nc_node->orig_node = orig_neigh_node; |
daf99b48 SE |
866 | kref_init(&nc_node->refcount); |
867 | kref_get(&nc_node->refcount); | |
d56b1705 MH |
868 | |
869 | /* Select ingoing or outgoing coding node */ | |
870 | if (in_coding) { | |
871 | lock = &orig_neigh_node->in_coding_list_lock; | |
872 | list = &orig_neigh_node->in_coding_list; | |
873 | } else { | |
874 | lock = &orig_neigh_node->out_coding_list_lock; | |
875 | list = &orig_neigh_node->out_coding_list; | |
876 | } | |
877 | ||
878 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", | |
879 | nc_node->addr, nc_node->orig_node->orig); | |
880 | ||
881 | /* Add nc_node to orig_node */ | |
882 | spin_lock_bh(lock); | |
883 | list_add_tail_rcu(&nc_node->list, list); | |
884 | spin_unlock_bh(lock); | |
885 | ||
886 | return nc_node; | |
887 | ||
888 | free: | |
889 | kfree(nc_node); | |
890 | return NULL; | |
891 | } | |
892 | ||
893 | /** | |
34473822 SE |
894 | * batadv_nc_update_nc_node - updates stored incoming and outgoing nc node |
895 | * structs (best called on incoming OGMs) | |
d56b1705 MH |
896 | * @bat_priv: the bat priv with all the soft interface information |
897 | * @orig_node: orig node originating the ogm packet | |
898 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
899 | * (can be equal to orig_node) | |
900 | * @ogm_packet: incoming ogm packet | |
901 | * @is_single_hop_neigh: orig_node is a single hop neighbor | |
902 | */ | |
903 | void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, | |
904 | struct batadv_orig_node *orig_node, | |
905 | struct batadv_orig_node *orig_neigh_node, | |
906 | struct batadv_ogm_packet *ogm_packet, | |
907 | int is_single_hop_neigh) | |
908 | { | |
4f248cff SE |
909 | struct batadv_nc_node *in_nc_node = NULL; |
910 | struct batadv_nc_node *out_nc_node = NULL; | |
d56b1705 MH |
911 | |
912 | /* Check if network coding is enabled */ | |
913 | if (!atomic_read(&bat_priv->network_coding)) | |
914 | goto out; | |
915 | ||
3f4841ff | 916 | /* check if orig node is network coding enabled */ |
4635469f | 917 | if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities)) |
3f4841ff ML |
918 | goto out; |
919 | ||
d56b1705 MH |
920 | /* accept ogms from 'good' neighbors and single hop neighbors */ |
921 | if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && | |
922 | !is_single_hop_neigh) | |
923 | goto out; | |
924 | ||
925 | /* Add orig_node as in_nc_node on hop */ | |
926 | in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, | |
927 | orig_neigh_node, true); | |
928 | if (!in_nc_node) | |
929 | goto out; | |
930 | ||
931 | in_nc_node->last_seen = jiffies; | |
932 | ||
933 | /* Add hop as out_nc_node on orig_node */ | |
934 | out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, | |
935 | orig_node, false); | |
936 | if (!out_nc_node) | |
937 | goto out; | |
938 | ||
939 | out_nc_node->last_seen = jiffies; | |
940 | ||
941 | out: | |
942 | if (in_nc_node) | |
27ad7545 | 943 | batadv_nc_node_put(in_nc_node); |
d56b1705 | 944 | if (out_nc_node) |
27ad7545 | 945 | batadv_nc_node_put(out_nc_node); |
d56b1705 MH |
946 | } |
947 | ||
95332477 MH |
948 | /** |
949 | * batadv_nc_get_path - get existing nc_path or allocate a new one | |
950 | * @bat_priv: the bat priv with all the soft interface information | |
951 | * @hash: hash table containing the nc path | |
952 | * @src: ethernet source address - first half of the nc path search key | |
953 | * @dst: ethernet destination address - second half of the nc path search key | |
954 | * | |
62fe710f | 955 | * Return: pointer to nc_path if the path was found or created, returns NULL |
95332477 MH |
956 | * on error. |
957 | */ | |
958 | static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, | |
959 | struct batadv_hashtable *hash, | |
6b5e971a SE |
960 | u8 *src, |
961 | u8 *dst) | |
95332477 MH |
962 | { |
963 | int hash_added; | |
964 | struct batadv_nc_path *nc_path, nc_path_key; | |
965 | ||
966 | batadv_nc_hash_key_gen(&nc_path_key, src, dst); | |
967 | ||
968 | /* Search for existing nc_path */ | |
969 | nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); | |
970 | ||
971 | if (nc_path) { | |
972 | /* Set timestamp to delay removal of nc_path */ | |
973 | nc_path->last_valid = jiffies; | |
974 | return nc_path; | |
975 | } | |
976 | ||
977 | /* No existing nc_path was found; create a new */ | |
978 | nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); | |
979 | ||
980 | if (!nc_path) | |
981 | return NULL; | |
982 | ||
983 | /* Initialize nc_path */ | |
984 | INIT_LIST_HEAD(&nc_path->packet_list); | |
985 | spin_lock_init(&nc_path->packet_list_lock); | |
727e0cd5 SE |
986 | kref_init(&nc_path->refcount); |
987 | kref_get(&nc_path->refcount); | |
95332477 | 988 | nc_path->last_valid = jiffies; |
8fdd0153 AQ |
989 | ether_addr_copy(nc_path->next_hop, dst); |
990 | ether_addr_copy(nc_path->prev_hop, src); | |
95332477 MH |
991 | |
992 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", | |
993 | nc_path->prev_hop, | |
994 | nc_path->next_hop); | |
995 | ||
996 | /* Add nc_path to hash table */ | |
997 | hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, | |
998 | batadv_nc_hash_choose, &nc_path_key, | |
999 | &nc_path->hash_entry); | |
1000 | ||
1001 | if (hash_added < 0) { | |
1002 | kfree(nc_path); | |
1003 | return NULL; | |
1004 | } | |
1005 | ||
1006 | return nc_path; | |
1007 | } | |
1008 | ||
3c12de9a MH |
1009 | /** |
1010 | * batadv_nc_random_weight_tq - scale the receivers TQ-value to avoid unfair | |
1011 | * selection of a receiver with slightly lower TQ than the other | |
1012 | * @tq: to be weighted tq value | |
672e7978 SE |
1013 | * |
1014 | * Return: scaled tq value | |
3c12de9a | 1015 | */ |
6b5e971a | 1016 | static u8 batadv_nc_random_weight_tq(u8 tq) |
3c12de9a | 1017 | { |
6b5e971a | 1018 | u8 rand_val, rand_tq; |
3c12de9a MH |
1019 | |
1020 | get_random_bytes(&rand_val, sizeof(rand_val)); | |
1021 | ||
1022 | /* randomize the estimated packet loss (max TQ - estimated TQ) */ | |
1023 | rand_tq = rand_val * (BATADV_TQ_MAX_VALUE - tq); | |
1024 | ||
1025 | /* normalize the randomized packet loss */ | |
1026 | rand_tq /= BATADV_TQ_MAX_VALUE; | |
1027 | ||
1028 | /* convert to (randomized) estimated tq again */ | |
1029 | return BATADV_TQ_MAX_VALUE - rand_tq; | |
1030 | } | |
1031 | ||
1032 | /** | |
1033 | * batadv_nc_memxor - XOR destination with source | |
1034 | * @dst: byte array to XOR into | |
1035 | * @src: byte array to XOR from | |
1036 | * @len: length of destination array | |
1037 | */ | |
1038 | static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) | |
1039 | { | |
1040 | unsigned int i; | |
1041 | ||
1042 | for (i = 0; i < len; ++i) | |
1043 | dst[i] ^= src[i]; | |
1044 | } | |
1045 | ||
1046 | /** | |
1047 | * batadv_nc_code_packets - code a received unicast_packet with an nc packet | |
1048 | * into a coded_packet and send it | |
1049 | * @bat_priv: the bat priv with all the soft interface information | |
1050 | * @skb: data skb to forward | |
1051 | * @ethhdr: pointer to the ethernet header inside the skb | |
1052 | * @nc_packet: structure containing the packet to the skb can be coded with | |
1053 | * @neigh_node: next hop to forward packet to | |
1054 | * | |
62fe710f | 1055 | * Return: true if both packets are consumed, false otherwise. |
3c12de9a MH |
1056 | */ |
1057 | static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, | |
1058 | struct sk_buff *skb, | |
1059 | struct ethhdr *ethhdr, | |
1060 | struct batadv_nc_packet *nc_packet, | |
1061 | struct batadv_neigh_node *neigh_node) | |
1062 | { | |
6b5e971a | 1063 | u8 tq_weighted_neigh, tq_weighted_coding, tq_tmp; |
3c12de9a MH |
1064 | struct sk_buff *skb_dest, *skb_src; |
1065 | struct batadv_unicast_packet *packet1; | |
1066 | struct batadv_unicast_packet *packet2; | |
1067 | struct batadv_coded_packet *coded_packet; | |
95d39278 AQ |
1068 | struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest; |
1069 | struct batadv_neigh_node *router_coding = NULL, *second_dest; | |
89652331 SW |
1070 | struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL; |
1071 | struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL; | |
95d39278 | 1072 | u8 *first_source, *second_source; |
3c12de9a MH |
1073 | __be32 packet_id1, packet_id2; |
1074 | size_t count; | |
1075 | bool res = false; | |
1076 | int coding_len; | |
1077 | int unicast_size = sizeof(*packet1); | |
1078 | int coded_size = sizeof(*coded_packet); | |
1079 | int header_add = coded_size - unicast_size; | |
1080 | ||
7351a482 SW |
1081 | /* TODO: do we need to consider the outgoing interface for |
1082 | * coded packets? | |
1083 | */ | |
1084 | router_neigh = batadv_orig_router_get(neigh_node->orig_node, | |
1085 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1086 | if (!router_neigh) |
1087 | goto out; | |
1088 | ||
89652331 SW |
1089 | router_neigh_ifinfo = batadv_neigh_ifinfo_get(router_neigh, |
1090 | BATADV_IF_DEFAULT); | |
1091 | if (!router_neigh_ifinfo) | |
1092 | goto out; | |
1093 | ||
3c12de9a | 1094 | neigh_tmp = nc_packet->neigh_node; |
7351a482 SW |
1095 | router_coding = batadv_orig_router_get(neigh_tmp->orig_node, |
1096 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1097 | if (!router_coding) |
1098 | goto out; | |
1099 | ||
89652331 SW |
1100 | router_coding_ifinfo = batadv_neigh_ifinfo_get(router_coding, |
1101 | BATADV_IF_DEFAULT); | |
1102 | if (!router_coding_ifinfo) | |
1103 | goto out; | |
1104 | ||
1105 | tq_tmp = router_neigh_ifinfo->bat_iv.tq_avg; | |
1106 | tq_weighted_neigh = batadv_nc_random_weight_tq(tq_tmp); | |
1107 | tq_tmp = router_coding_ifinfo->bat_iv.tq_avg; | |
1108 | tq_weighted_coding = batadv_nc_random_weight_tq(tq_tmp); | |
3c12de9a MH |
1109 | |
1110 | /* Select one destination for the MAC-header dst-field based on | |
1111 | * weighted TQ-values. | |
1112 | */ | |
1113 | if (tq_weighted_neigh >= tq_weighted_coding) { | |
1114 | /* Destination from nc_packet is selected for MAC-header */ | |
95d39278 | 1115 | first_dest = nc_packet->neigh_node; |
3c12de9a | 1116 | first_source = nc_packet->nc_path->prev_hop; |
95d39278 | 1117 | second_dest = neigh_node; |
3c12de9a MH |
1118 | second_source = ethhdr->h_source; |
1119 | packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1120 | packet2 = (struct batadv_unicast_packet *)skb->data; | |
1121 | packet_id1 = nc_packet->packet_id; | |
1122 | packet_id2 = batadv_skb_crc32(skb, | |
1123 | skb->data + sizeof(*packet2)); | |
1124 | } else { | |
1125 | /* Destination for skb is selected for MAC-header */ | |
95d39278 | 1126 | first_dest = neigh_node; |
3c12de9a | 1127 | first_source = ethhdr->h_source; |
95d39278 | 1128 | second_dest = nc_packet->neigh_node; |
3c12de9a MH |
1129 | second_source = nc_packet->nc_path->prev_hop; |
1130 | packet1 = (struct batadv_unicast_packet *)skb->data; | |
1131 | packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1132 | packet_id1 = batadv_skb_crc32(skb, | |
1133 | skb->data + sizeof(*packet1)); | |
1134 | packet_id2 = nc_packet->packet_id; | |
1135 | } | |
1136 | ||
1137 | /* Instead of zero padding the smallest data buffer, we | |
1138 | * code into the largest. | |
1139 | */ | |
1140 | if (skb->len <= nc_packet->skb->len) { | |
1141 | skb_dest = nc_packet->skb; | |
1142 | skb_src = skb; | |
1143 | } else { | |
1144 | skb_dest = skb; | |
1145 | skb_src = nc_packet->skb; | |
1146 | } | |
1147 | ||
1148 | /* coding_len is used when decoding the packet shorter packet */ | |
1149 | coding_len = skb_src->len - unicast_size; | |
1150 | ||
1151 | if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) | |
1152 | goto out; | |
1153 | ||
1154 | skb_push(skb_dest, header_add); | |
1155 | ||
1156 | coded_packet = (struct batadv_coded_packet *)skb_dest->data; | |
1157 | skb_reset_mac_header(skb_dest); | |
1158 | ||
a40d9b07 SW |
1159 | coded_packet->packet_type = BATADV_CODED; |
1160 | coded_packet->version = BATADV_COMPAT_VERSION; | |
1161 | coded_packet->ttl = packet1->ttl; | |
3c12de9a MH |
1162 | |
1163 | /* Info about first unicast packet */ | |
8fdd0153 AQ |
1164 | ether_addr_copy(coded_packet->first_source, first_source); |
1165 | ether_addr_copy(coded_packet->first_orig_dest, packet1->dest); | |
3c12de9a MH |
1166 | coded_packet->first_crc = packet_id1; |
1167 | coded_packet->first_ttvn = packet1->ttvn; | |
1168 | ||
1169 | /* Info about second unicast packet */ | |
95d39278 | 1170 | ether_addr_copy(coded_packet->second_dest, second_dest->addr); |
8fdd0153 AQ |
1171 | ether_addr_copy(coded_packet->second_source, second_source); |
1172 | ether_addr_copy(coded_packet->second_orig_dest, packet2->dest); | |
3c12de9a | 1173 | coded_packet->second_crc = packet_id2; |
a40d9b07 | 1174 | coded_packet->second_ttl = packet2->ttl; |
3c12de9a MH |
1175 | coded_packet->second_ttvn = packet2->ttvn; |
1176 | coded_packet->coded_len = htons(coding_len); | |
1177 | ||
1178 | /* This is where the magic happens: Code skb_src into skb_dest */ | |
1179 | batadv_nc_memxor(skb_dest->data + coded_size, | |
1180 | skb_src->data + unicast_size, coding_len); | |
1181 | ||
1182 | /* Update counters accordingly */ | |
1183 | if (BATADV_SKB_CB(skb_src)->decoded && | |
1184 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1185 | /* Both packets are recoded */ | |
1186 | count = skb_src->len + ETH_HLEN; | |
1187 | count += skb_dest->len + ETH_HLEN; | |
1188 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); | |
1189 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); | |
1190 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1191 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1192 | /* Both packets are newly coded */ | |
1193 | count = skb_src->len + ETH_HLEN; | |
1194 | count += skb_dest->len + ETH_HLEN; | |
1195 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); | |
1196 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); | |
1197 | } else if (BATADV_SKB_CB(skb_src)->decoded && | |
1198 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1199 | /* skb_src recoded and skb_dest is newly coded */ | |
1200 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1201 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1202 | skb_src->len + ETH_HLEN); | |
1203 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1204 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1205 | skb_dest->len + ETH_HLEN); | |
1206 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1207 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1208 | /* skb_src is newly coded and skb_dest is recoded */ | |
1209 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1210 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1211 | skb_src->len + ETH_HLEN); | |
1212 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1213 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1214 | skb_dest->len + ETH_HLEN); | |
1215 | } | |
1216 | ||
1217 | /* skb_src is now coded into skb_dest, so free it */ | |
1218 | kfree_skb(skb_src); | |
1219 | ||
1220 | /* avoid duplicate free of skb from nc_packet */ | |
1221 | nc_packet->skb = NULL; | |
1222 | batadv_nc_packet_free(nc_packet); | |
1223 | ||
1224 | /* Send the coded packet and return true */ | |
95d39278 | 1225 | batadv_send_unicast_skb(skb_dest, first_dest); |
3c12de9a MH |
1226 | res = true; |
1227 | out: | |
1228 | if (router_neigh) | |
25bb2509 | 1229 | batadv_neigh_node_put(router_neigh); |
3c12de9a | 1230 | if (router_coding) |
25bb2509 | 1231 | batadv_neigh_node_put(router_coding); |
89652331 | 1232 | if (router_neigh_ifinfo) |
044fa3ae | 1233 | batadv_neigh_ifinfo_put(router_neigh_ifinfo); |
89652331 | 1234 | if (router_coding_ifinfo) |
044fa3ae | 1235 | batadv_neigh_ifinfo_put(router_coding_ifinfo); |
3c12de9a MH |
1236 | return res; |
1237 | } | |
1238 | ||
1239 | /** | |
1240 | * batadv_nc_skb_coding_possible - true if a decoded skb is available at dst. | |
1241 | * @skb: data skb to forward | |
1242 | * @dst: destination mac address of the other skb to code with | |
1243 | * @src: source mac address of skb | |
1244 | * | |
1245 | * Whenever we network code a packet we have to check whether we received it in | |
1246 | * a network coded form. If so, we may not be able to use it for coding because | |
1247 | * some neighbors may also have received (overheard) the packet in the network | |
1248 | * coded form without being able to decode it. It is hard to know which of the | |
1249 | * neighboring nodes was able to decode the packet, therefore we can only | |
1250 | * re-code the packet if the source of the previous encoded packet is involved. | |
1251 | * Since the source encoded the packet we can be certain it has all necessary | |
1252 | * decode information. | |
1253 | * | |
62fe710f | 1254 | * Return: true if coding of a decoded packet is allowed. |
3c12de9a | 1255 | */ |
6b5e971a | 1256 | static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) |
3c12de9a MH |
1257 | { |
1258 | if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) | |
1259 | return false; | |
24820df1 | 1260 | return true; |
3c12de9a MH |
1261 | } |
1262 | ||
1263 | /** | |
1264 | * batadv_nc_path_search - Find the coding path matching in_nc_node and | |
1265 | * out_nc_node to retrieve a buffered packet that can be used for coding. | |
1266 | * @bat_priv: the bat priv with all the soft interface information | |
1267 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1268 | * @out_nc_node: pointer to skb source's neighbor nc node | |
1269 | * @skb: data skb to forward | |
1270 | * @eth_dst: next hop mac address of skb | |
1271 | * | |
62fe710f | 1272 | * Return: true if coding of a decoded skb is allowed. |
3c12de9a MH |
1273 | */ |
1274 | static struct batadv_nc_packet * | |
1275 | batadv_nc_path_search(struct batadv_priv *bat_priv, | |
1276 | struct batadv_nc_node *in_nc_node, | |
1277 | struct batadv_nc_node *out_nc_node, | |
1278 | struct sk_buff *skb, | |
6b5e971a | 1279 | u8 *eth_dst) |
3c12de9a MH |
1280 | { |
1281 | struct batadv_nc_path *nc_path, nc_path_key; | |
1282 | struct batadv_nc_packet *nc_packet_out = NULL; | |
1283 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
1284 | struct batadv_hashtable *hash = bat_priv->nc.coding_hash; | |
1285 | int idx; | |
1286 | ||
1287 | if (!hash) | |
1288 | return NULL; | |
1289 | ||
1290 | /* Create almost path key */ | |
1291 | batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, | |
1292 | out_nc_node->addr); | |
1293 | idx = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1294 | ||
1295 | /* Check for coding opportunities in this nc_path */ | |
1296 | rcu_read_lock(); | |
1297 | hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { | |
1298 | if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) | |
1299 | continue; | |
1300 | ||
1301 | if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) | |
1302 | continue; | |
1303 | ||
1304 | spin_lock_bh(&nc_path->packet_list_lock); | |
1305 | if (list_empty(&nc_path->packet_list)) { | |
1306 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1307 | continue; | |
1308 | } | |
1309 | ||
1310 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
1311 | &nc_path->packet_list, list) { | |
1312 | if (!batadv_nc_skb_coding_possible(nc_packet->skb, | |
1313 | eth_dst, | |
1314 | in_nc_node->addr)) | |
1315 | continue; | |
1316 | ||
1317 | /* Coding opportunity is found! */ | |
1318 | list_del(&nc_packet->list); | |
1319 | nc_packet_out = nc_packet; | |
1320 | break; | |
1321 | } | |
1322 | ||
1323 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1324 | break; | |
1325 | } | |
1326 | rcu_read_unlock(); | |
1327 | ||
1328 | return nc_packet_out; | |
1329 | } | |
1330 | ||
1331 | /** | |
1332 | * batadv_nc_skb_src_search - Loops through the list of neighoring nodes of the | |
1333 | * skb's sender (may be equal to the originator). | |
1334 | * @bat_priv: the bat priv with all the soft interface information | |
1335 | * @skb: data skb to forward | |
1336 | * @eth_dst: next hop mac address of skb | |
1337 | * @eth_src: source mac address of skb | |
1338 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1339 | * | |
62fe710f | 1340 | * Return: an nc packet if a suitable coding packet was found, NULL otherwise. |
3c12de9a MH |
1341 | */ |
1342 | static struct batadv_nc_packet * | |
1343 | batadv_nc_skb_src_search(struct batadv_priv *bat_priv, | |
1344 | struct sk_buff *skb, | |
6b5e971a SE |
1345 | u8 *eth_dst, |
1346 | u8 *eth_src, | |
3c12de9a MH |
1347 | struct batadv_nc_node *in_nc_node) |
1348 | { | |
1349 | struct batadv_orig_node *orig_node; | |
1350 | struct batadv_nc_node *out_nc_node; | |
1351 | struct batadv_nc_packet *nc_packet = NULL; | |
1352 | ||
1353 | orig_node = batadv_orig_hash_find(bat_priv, eth_src); | |
1354 | if (!orig_node) | |
1355 | return NULL; | |
1356 | ||
1357 | rcu_read_lock(); | |
1358 | list_for_each_entry_rcu(out_nc_node, | |
1359 | &orig_node->out_coding_list, list) { | |
1360 | /* Check if the skb is decoded and if recoding is possible */ | |
1361 | if (!batadv_nc_skb_coding_possible(skb, | |
1362 | out_nc_node->addr, eth_src)) | |
1363 | continue; | |
1364 | ||
1365 | /* Search for an opportunity in this nc_path */ | |
1366 | nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, | |
1367 | out_nc_node, skb, eth_dst); | |
1368 | if (nc_packet) | |
1369 | break; | |
1370 | } | |
1371 | rcu_read_unlock(); | |
1372 | ||
5d967310 | 1373 | batadv_orig_node_put(orig_node); |
3c12de9a MH |
1374 | return nc_packet; |
1375 | } | |
1376 | ||
612d2b4f MH |
1377 | /** |
1378 | * batadv_nc_skb_store_before_coding - set the ethernet src and dst of the | |
1379 | * unicast skb before it is stored for use in later decoding | |
1380 | * @bat_priv: the bat priv with all the soft interface information | |
1381 | * @skb: data skb to store | |
1382 | * @eth_dst_new: new destination mac address of skb | |
1383 | */ | |
1384 | static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, | |
1385 | struct sk_buff *skb, | |
6b5e971a | 1386 | u8 *eth_dst_new) |
612d2b4f MH |
1387 | { |
1388 | struct ethhdr *ethhdr; | |
1389 | ||
1390 | /* Copy skb header to change the mac header */ | |
bad93e9d | 1391 | skb = pskb_copy_for_clone(skb, GFP_ATOMIC); |
612d2b4f MH |
1392 | if (!skb) |
1393 | return; | |
1394 | ||
1395 | /* Set the mac header as if we actually sent the packet uncoded */ | |
7ed4be95 | 1396 | ethhdr = eth_hdr(skb); |
8fdd0153 AQ |
1397 | ether_addr_copy(ethhdr->h_source, ethhdr->h_dest); |
1398 | ether_addr_copy(ethhdr->h_dest, eth_dst_new); | |
612d2b4f MH |
1399 | |
1400 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1401 | skb_push(skb, ETH_HLEN); | |
1402 | ||
1403 | /* Add the packet to the decoding packet pool */ | |
1404 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1405 | ||
1406 | /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free | |
1407 | * our ref | |
1408 | */ | |
1409 | kfree_skb(skb); | |
1410 | } | |
1411 | ||
3c12de9a MH |
1412 | /** |
1413 | * batadv_nc_skb_dst_search - Loops through list of neighboring nodes to dst. | |
1414 | * @skb: data skb to forward | |
1415 | * @neigh_node: next hop to forward packet to | |
1416 | * @ethhdr: pointer to the ethernet header inside the skb | |
1417 | * | |
1418 | * Loops through list of neighboring nodes the next hop has a good connection to | |
1419 | * (receives OGMs with a sufficient quality). We need to find a neighbor of our | |
1420 | * next hop that potentially sent a packet which our next hop also received | |
1421 | * (overheard) and has stored for later decoding. | |
1422 | * | |
62fe710f | 1423 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
3c12de9a MH |
1424 | */ |
1425 | static bool batadv_nc_skb_dst_search(struct sk_buff *skb, | |
1426 | struct batadv_neigh_node *neigh_node, | |
1427 | struct ethhdr *ethhdr) | |
1428 | { | |
1429 | struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1430 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1431 | struct batadv_orig_node *orig_node = neigh_node->orig_node; | |
1432 | struct batadv_nc_node *nc_node; | |
1433 | struct batadv_nc_packet *nc_packet = NULL; | |
1434 | ||
1435 | rcu_read_lock(); | |
1436 | list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { | |
1437 | /* Search for coding opportunity with this in_nc_node */ | |
1438 | nc_packet = batadv_nc_skb_src_search(bat_priv, skb, | |
1439 | neigh_node->addr, | |
1440 | ethhdr->h_source, nc_node); | |
1441 | ||
1442 | /* Opportunity was found, so stop searching */ | |
1443 | if (nc_packet) | |
1444 | break; | |
1445 | } | |
1446 | rcu_read_unlock(); | |
1447 | ||
1448 | if (!nc_packet) | |
1449 | return false; | |
1450 | ||
612d2b4f MH |
1451 | /* Save packets for later decoding */ |
1452 | batadv_nc_skb_store_before_coding(bat_priv, skb, | |
1453 | neigh_node->addr); | |
1454 | batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, | |
1455 | nc_packet->neigh_node->addr); | |
1456 | ||
3c12de9a MH |
1457 | /* Code and send packets */ |
1458 | if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, | |
1459 | neigh_node)) | |
1460 | return true; | |
1461 | ||
1462 | /* out of mem ? Coding failed - we have to free the buffered packet | |
1463 | * to avoid memleaks. The skb passed as argument will be dealt with | |
1464 | * by the calling function. | |
1465 | */ | |
1466 | batadv_nc_send_packet(nc_packet); | |
1467 | return false; | |
1468 | } | |
1469 | ||
95332477 MH |
1470 | /** |
1471 | * batadv_nc_skb_add_to_path - buffer skb for later encoding / decoding | |
1472 | * @skb: skb to add to path | |
1473 | * @nc_path: path to add skb to | |
1474 | * @neigh_node: next hop to forward packet to | |
1475 | * @packet_id: checksum to identify packet | |
1476 | * | |
62fe710f | 1477 | * Return: true if the packet was buffered or false in case of an error. |
95332477 MH |
1478 | */ |
1479 | static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, | |
1480 | struct batadv_nc_path *nc_path, | |
1481 | struct batadv_neigh_node *neigh_node, | |
1482 | __be32 packet_id) | |
1483 | { | |
1484 | struct batadv_nc_packet *nc_packet; | |
1485 | ||
1486 | nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); | |
1487 | if (!nc_packet) | |
1488 | return false; | |
1489 | ||
1490 | /* Initialize nc_packet */ | |
1491 | nc_packet->timestamp = jiffies; | |
1492 | nc_packet->packet_id = packet_id; | |
1493 | nc_packet->skb = skb; | |
1494 | nc_packet->neigh_node = neigh_node; | |
1495 | nc_packet->nc_path = nc_path; | |
1496 | ||
1497 | /* Add coding packet to list */ | |
1498 | spin_lock_bh(&nc_path->packet_list_lock); | |
1499 | list_add_tail(&nc_packet->list, &nc_path->packet_list); | |
1500 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1501 | ||
1502 | return true; | |
1503 | } | |
1504 | ||
1505 | /** | |
1506 | * batadv_nc_skb_forward - try to code a packet or add it to the coding packet | |
1507 | * buffer | |
1508 | * @skb: data skb to forward | |
1509 | * @neigh_node: next hop to forward packet to | |
95332477 | 1510 | * |
62fe710f | 1511 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
95332477 MH |
1512 | */ |
1513 | bool batadv_nc_skb_forward(struct sk_buff *skb, | |
e91ecfc6 | 1514 | struct batadv_neigh_node *neigh_node) |
95332477 MH |
1515 | { |
1516 | const struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1517 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1518 | struct batadv_unicast_packet *packet; | |
1519 | struct batadv_nc_path *nc_path; | |
e91ecfc6 | 1520 | struct ethhdr *ethhdr = eth_hdr(skb); |
95332477 MH |
1521 | __be32 packet_id; |
1522 | u8 *payload; | |
1523 | ||
1524 | /* Check if network coding is enabled */ | |
1525 | if (!atomic_read(&bat_priv->network_coding)) | |
1526 | goto out; | |
1527 | ||
1528 | /* We only handle unicast packets */ | |
1529 | payload = skb_network_header(skb); | |
1530 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1531 | if (packet->packet_type != BATADV_UNICAST) |
95332477 MH |
1532 | goto out; |
1533 | ||
3c12de9a MH |
1534 | /* Try to find a coding opportunity and send the skb if one is found */ |
1535 | if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) | |
1536 | return true; | |
1537 | ||
95332477 MH |
1538 | /* Find or create a nc_path for this src-dst pair */ |
1539 | nc_path = batadv_nc_get_path(bat_priv, | |
1540 | bat_priv->nc.coding_hash, | |
1541 | ethhdr->h_source, | |
1542 | neigh_node->addr); | |
1543 | ||
1544 | if (!nc_path) | |
1545 | goto out; | |
1546 | ||
1547 | /* Add skb to nc_path */ | |
1548 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1549 | if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) | |
1550 | goto free_nc_path; | |
1551 | ||
1552 | /* Packet is consumed */ | |
1553 | return true; | |
1554 | ||
1555 | free_nc_path: | |
5fff2825 | 1556 | batadv_nc_path_put(nc_path); |
95332477 MH |
1557 | out: |
1558 | /* Packet is not consumed */ | |
1559 | return false; | |
1560 | } | |
1561 | ||
612d2b4f MH |
1562 | /** |
1563 | * batadv_nc_skb_store_for_decoding - save a clone of the skb which can be used | |
1564 | * when decoding coded packets | |
1565 | * @bat_priv: the bat priv with all the soft interface information | |
1566 | * @skb: data skb to store | |
1567 | */ | |
1568 | void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, | |
1569 | struct sk_buff *skb) | |
1570 | { | |
1571 | struct batadv_unicast_packet *packet; | |
1572 | struct batadv_nc_path *nc_path; | |
7ed4be95 | 1573 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f MH |
1574 | __be32 packet_id; |
1575 | u8 *payload; | |
1576 | ||
1577 | /* Check if network coding is enabled */ | |
1578 | if (!atomic_read(&bat_priv->network_coding)) | |
1579 | goto out; | |
1580 | ||
1581 | /* Check for supported packet type */ | |
1582 | payload = skb_network_header(skb); | |
1583 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1584 | if (packet->packet_type != BATADV_UNICAST) |
612d2b4f MH |
1585 | goto out; |
1586 | ||
1587 | /* Find existing nc_path or create a new */ | |
1588 | nc_path = batadv_nc_get_path(bat_priv, | |
1589 | bat_priv->nc.decoding_hash, | |
1590 | ethhdr->h_source, | |
1591 | ethhdr->h_dest); | |
1592 | ||
1593 | if (!nc_path) | |
1594 | goto out; | |
1595 | ||
1596 | /* Clone skb and adjust skb->data to point at batman header */ | |
1597 | skb = skb_clone(skb, GFP_ATOMIC); | |
1598 | if (unlikely(!skb)) | |
1599 | goto free_nc_path; | |
1600 | ||
1601 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) | |
1602 | goto free_skb; | |
1603 | ||
1604 | if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) | |
1605 | goto free_skb; | |
1606 | ||
1607 | /* Add skb to nc_path */ | |
1608 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1609 | if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) | |
1610 | goto free_skb; | |
1611 | ||
1612 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); | |
1613 | return; | |
1614 | ||
1615 | free_skb: | |
1616 | kfree_skb(skb); | |
1617 | free_nc_path: | |
5fff2825 | 1618 | batadv_nc_path_put(nc_path); |
612d2b4f MH |
1619 | out: |
1620 | return; | |
1621 | } | |
1622 | ||
1623 | /** | |
1624 | * batadv_nc_skb_store_sniffed_unicast - check if a received unicast packet | |
1625 | * should be saved in the decoding buffer and, if so, store it there | |
1626 | * @bat_priv: the bat priv with all the soft interface information | |
1627 | * @skb: unicast skb to store | |
1628 | */ | |
1629 | void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, | |
1630 | struct sk_buff *skb) | |
1631 | { | |
7ed4be95 | 1632 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f | 1633 | |
6e0895c2 | 1634 | if (batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
612d2b4f MH |
1635 | return; |
1636 | ||
1637 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1638 | skb_push(skb, ETH_HLEN); | |
1639 | ||
1640 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1641 | } | |
1642 | ||
2df5278b MH |
1643 | /** |
1644 | * batadv_nc_skb_decode_packet - decode given skb using the decode data stored | |
1645 | * in nc_packet | |
6e0895c2 | 1646 | * @bat_priv: the bat priv with all the soft interface information |
2df5278b MH |
1647 | * @skb: unicast skb to decode |
1648 | * @nc_packet: decode data needed to decode the skb | |
1649 | * | |
62fe710f | 1650 | * Return: pointer to decoded unicast packet if the packet was decoded or NULL |
2df5278b MH |
1651 | * in case of an error. |
1652 | */ | |
1653 | static struct batadv_unicast_packet * | |
6e0895c2 | 1654 | batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, |
2df5278b MH |
1655 | struct batadv_nc_packet *nc_packet) |
1656 | { | |
1657 | const int h_size = sizeof(struct batadv_unicast_packet); | |
1658 | const int h_diff = sizeof(struct batadv_coded_packet) - h_size; | |
1659 | struct batadv_unicast_packet *unicast_packet; | |
1660 | struct batadv_coded_packet coded_packet_tmp; | |
1661 | struct ethhdr *ethhdr, ethhdr_tmp; | |
6b5e971a | 1662 | u8 *orig_dest, ttl, ttvn; |
2df5278b | 1663 | unsigned int coding_len; |
7da19971 | 1664 | int err; |
2df5278b MH |
1665 | |
1666 | /* Save headers temporarily */ | |
1667 | memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp)); | |
1668 | memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp)); | |
1669 | ||
1670 | if (skb_cow(skb, 0) < 0) | |
1671 | return NULL; | |
1672 | ||
1673 | if (unlikely(!skb_pull_rcsum(skb, h_diff))) | |
1674 | return NULL; | |
1675 | ||
1676 | /* Data points to batman header, so set mac header 14 bytes before | |
1677 | * and network to data | |
1678 | */ | |
1679 | skb_set_mac_header(skb, -ETH_HLEN); | |
1680 | skb_reset_network_header(skb); | |
1681 | ||
1682 | /* Reconstruct original mac header */ | |
7ed4be95 | 1683 | ethhdr = eth_hdr(skb); |
abae9479 | 1684 | *ethhdr = ethhdr_tmp; |
2df5278b MH |
1685 | |
1686 | /* Select the correct unicast header information based on the location | |
1687 | * of our mac address in the coded_packet header | |
1688 | */ | |
6e0895c2 | 1689 | if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) { |
2df5278b MH |
1690 | /* If we are the second destination the packet was overheard, |
1691 | * so the Ethernet address must be copied to h_dest and | |
1692 | * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST | |
1693 | */ | |
8fdd0153 | 1694 | ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest); |
2df5278b MH |
1695 | skb->pkt_type = PACKET_HOST; |
1696 | ||
1697 | orig_dest = coded_packet_tmp.second_orig_dest; | |
1698 | ttl = coded_packet_tmp.second_ttl; | |
1699 | ttvn = coded_packet_tmp.second_ttvn; | |
1700 | } else { | |
1701 | orig_dest = coded_packet_tmp.first_orig_dest; | |
a40d9b07 | 1702 | ttl = coded_packet_tmp.ttl; |
2df5278b MH |
1703 | ttvn = coded_packet_tmp.first_ttvn; |
1704 | } | |
1705 | ||
1706 | coding_len = ntohs(coded_packet_tmp.coded_len); | |
1707 | ||
1708 | if (coding_len > skb->len) | |
1709 | return NULL; | |
1710 | ||
1711 | /* Here the magic is reversed: | |
1712 | * extract the missing packet from the received coded packet | |
1713 | */ | |
1714 | batadv_nc_memxor(skb->data + h_size, | |
1715 | nc_packet->skb->data + h_size, | |
1716 | coding_len); | |
1717 | ||
1718 | /* Resize decoded skb if decoded with larger packet */ | |
7da19971 ML |
1719 | if (nc_packet->skb->len > coding_len + h_size) { |
1720 | err = pskb_trim_rcsum(skb, coding_len + h_size); | |
1721 | if (err) | |
1722 | return NULL; | |
1723 | } | |
2df5278b MH |
1724 | |
1725 | /* Create decoded unicast packet */ | |
1726 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
a40d9b07 SW |
1727 | unicast_packet->packet_type = BATADV_UNICAST; |
1728 | unicast_packet->version = BATADV_COMPAT_VERSION; | |
1729 | unicast_packet->ttl = ttl; | |
8fdd0153 | 1730 | ether_addr_copy(unicast_packet->dest, orig_dest); |
2df5278b MH |
1731 | unicast_packet->ttvn = ttvn; |
1732 | ||
1733 | batadv_nc_packet_free(nc_packet); | |
1734 | return unicast_packet; | |
1735 | } | |
1736 | ||
1737 | /** | |
1738 | * batadv_nc_find_decoding_packet - search through buffered decoding data to | |
1739 | * find the data needed to decode the coded packet | |
1740 | * @bat_priv: the bat priv with all the soft interface information | |
1741 | * @ethhdr: pointer to the ethernet header inside the coded packet | |
1742 | * @coded: coded packet we try to find decode data for | |
1743 | * | |
62fe710f | 1744 | * Return: pointer to nc packet if the needed data was found or NULL otherwise. |
2df5278b MH |
1745 | */ |
1746 | static struct batadv_nc_packet * | |
1747 | batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, | |
1748 | struct ethhdr *ethhdr, | |
1749 | struct batadv_coded_packet *coded) | |
1750 | { | |
1751 | struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; | |
1752 | struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; | |
1753 | struct batadv_nc_path *nc_path, nc_path_key; | |
6b5e971a | 1754 | u8 *dest, *source; |
2df5278b MH |
1755 | __be32 packet_id; |
1756 | int index; | |
1757 | ||
1758 | if (!hash) | |
1759 | return NULL; | |
1760 | ||
1761 | /* Select the correct packet id based on the location of our mac-addr */ | |
1762 | dest = ethhdr->h_source; | |
6e0895c2 | 1763 | if (!batadv_is_my_mac(bat_priv, coded->second_dest)) { |
2df5278b MH |
1764 | source = coded->second_source; |
1765 | packet_id = coded->second_crc; | |
1766 | } else { | |
1767 | source = coded->first_source; | |
1768 | packet_id = coded->first_crc; | |
1769 | } | |
1770 | ||
1771 | batadv_nc_hash_key_gen(&nc_path_key, source, dest); | |
1772 | index = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1773 | ||
1774 | /* Search for matching coding path */ | |
1775 | rcu_read_lock(); | |
1776 | hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { | |
1777 | /* Find matching nc_packet */ | |
1778 | spin_lock_bh(&nc_path->packet_list_lock); | |
1779 | list_for_each_entry(tmp_nc_packet, | |
1780 | &nc_path->packet_list, list) { | |
1781 | if (packet_id == tmp_nc_packet->packet_id) { | |
1782 | list_del(&tmp_nc_packet->list); | |
1783 | ||
1784 | nc_packet = tmp_nc_packet; | |
1785 | break; | |
1786 | } | |
1787 | } | |
1788 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1789 | ||
1790 | if (nc_packet) | |
1791 | break; | |
1792 | } | |
1793 | rcu_read_unlock(); | |
1794 | ||
1795 | if (!nc_packet) | |
1796 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
1797 | "No decoding packet found for %u\n", packet_id); | |
1798 | ||
1799 | return nc_packet; | |
1800 | } | |
1801 | ||
1802 | /** | |
1803 | * batadv_nc_recv_coded_packet - try to decode coded packet and enqueue the | |
1804 | * resulting unicast packet | |
1805 | * @skb: incoming coded packet | |
1806 | * @recv_if: pointer to interface this packet was received on | |
672e7978 SE |
1807 | * |
1808 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1809 | * otherwise. | |
2df5278b MH |
1810 | */ |
1811 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, | |
1812 | struct batadv_hard_iface *recv_if) | |
1813 | { | |
1814 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1815 | struct batadv_unicast_packet *unicast_packet; | |
1816 | struct batadv_coded_packet *coded_packet; | |
1817 | struct batadv_nc_packet *nc_packet; | |
1818 | struct ethhdr *ethhdr; | |
1819 | int hdr_size = sizeof(*coded_packet); | |
1820 | ||
1821 | /* Check if network coding is enabled */ | |
1822 | if (!atomic_read(&bat_priv->network_coding)) | |
1823 | return NET_RX_DROP; | |
1824 | ||
1825 | /* Make sure we can access (and remove) header */ | |
1826 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
1827 | return NET_RX_DROP; | |
1828 | ||
1829 | coded_packet = (struct batadv_coded_packet *)skb->data; | |
7ed4be95 | 1830 | ethhdr = eth_hdr(skb); |
2df5278b MH |
1831 | |
1832 | /* Verify frame is destined for us */ | |
6e0895c2 DM |
1833 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) && |
1834 | !batadv_is_my_mac(bat_priv, coded_packet->second_dest)) | |
2df5278b MH |
1835 | return NET_RX_DROP; |
1836 | ||
1837 | /* Update stat counter */ | |
6e0895c2 | 1838 | if (batadv_is_my_mac(bat_priv, coded_packet->second_dest)) |
2df5278b MH |
1839 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED); |
1840 | ||
1841 | nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr, | |
1842 | coded_packet); | |
1843 | if (!nc_packet) { | |
1844 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
1845 | return NET_RX_DROP; | |
1846 | } | |
1847 | ||
1848 | /* Make skb's linear, because decoding accesses the entire buffer */ | |
1849 | if (skb_linearize(skb) < 0) | |
1850 | goto free_nc_packet; | |
1851 | ||
1852 | if (skb_linearize(nc_packet->skb) < 0) | |
1853 | goto free_nc_packet; | |
1854 | ||
1855 | /* Decode the packet */ | |
6e0895c2 | 1856 | unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet); |
2df5278b MH |
1857 | if (!unicast_packet) { |
1858 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
1859 | goto free_nc_packet; | |
1860 | } | |
1861 | ||
1862 | /* Mark packet as decoded to do correct recoding when forwarding */ | |
1863 | BATADV_SKB_CB(skb)->decoded = true; | |
1864 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE); | |
1865 | batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES, | |
1866 | skb->len + ETH_HLEN); | |
1867 | return batadv_recv_unicast_packet(skb, recv_if); | |
1868 | ||
1869 | free_nc_packet: | |
1870 | batadv_nc_packet_free(nc_packet); | |
1871 | return NET_RX_DROP; | |
1872 | } | |
1873 | ||
d353d8d4 | 1874 | /** |
6c519bad | 1875 | * batadv_nc_mesh_free - clean up network coding memory |
d353d8d4 MH |
1876 | * @bat_priv: the bat priv with all the soft interface information |
1877 | */ | |
6c519bad | 1878 | void batadv_nc_mesh_free(struct batadv_priv *bat_priv) |
d353d8d4 | 1879 | { |
3f4841ff ML |
1880 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); |
1881 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
d353d8d4 | 1882 | cancel_delayed_work_sync(&bat_priv->nc.work); |
612d2b4f | 1883 | |
95332477 MH |
1884 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); |
1885 | batadv_hash_destroy(bat_priv->nc.coding_hash); | |
612d2b4f MH |
1886 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); |
1887 | batadv_hash_destroy(bat_priv->nc.decoding_hash); | |
d353d8d4 | 1888 | } |
d56b1705 MH |
1889 | |
1890 | /** | |
1891 | * batadv_nc_nodes_seq_print_text - print the nc node information | |
1892 | * @seq: seq file to print on | |
1893 | * @offset: not used | |
672e7978 SE |
1894 | * |
1895 | * Return: always 0 | |
d56b1705 MH |
1896 | */ |
1897 | int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) | |
1898 | { | |
1899 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1900 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1901 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1902 | struct batadv_hard_iface *primary_if; | |
1903 | struct hlist_head *head; | |
1904 | struct batadv_orig_node *orig_node; | |
1905 | struct batadv_nc_node *nc_node; | |
1906 | int i; | |
1907 | ||
1908 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1909 | if (!primary_if) | |
1910 | goto out; | |
1911 | ||
1912 | /* Traverse list of originators */ | |
1913 | for (i = 0; i < hash->size; i++) { | |
1914 | head = &hash->table[i]; | |
1915 | ||
1916 | /* For each orig_node in this bin */ | |
1917 | rcu_read_lock(); | |
1918 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
aa27c312 ML |
1919 | /* no need to print the orig node if it does not have |
1920 | * network coding neighbors | |
1921 | */ | |
1922 | if (list_empty(&orig_node->in_coding_list) && | |
1923 | list_empty(&orig_node->out_coding_list)) | |
1924 | continue; | |
1925 | ||
d56b1705 MH |
1926 | seq_printf(seq, "Node: %pM\n", orig_node->orig); |
1927 | ||
0c814653 | 1928 | seq_puts(seq, " Ingoing: "); |
d56b1705 MH |
1929 | /* For each in_nc_node to this orig_node */ |
1930 | list_for_each_entry_rcu(nc_node, | |
1931 | &orig_node->in_coding_list, | |
1932 | list) | |
1933 | seq_printf(seq, "%pM ", | |
1934 | nc_node->addr); | |
0c814653 | 1935 | seq_puts(seq, "\n"); |
d56b1705 | 1936 | |
0c814653 | 1937 | seq_puts(seq, " Outgoing: "); |
d56b1705 MH |
1938 | /* For out_nc_node to this orig_node */ |
1939 | list_for_each_entry_rcu(nc_node, | |
1940 | &orig_node->out_coding_list, | |
1941 | list) | |
1942 | seq_printf(seq, "%pM ", | |
1943 | nc_node->addr); | |
0c814653 | 1944 | seq_puts(seq, "\n\n"); |
d56b1705 MH |
1945 | } |
1946 | rcu_read_unlock(); | |
1947 | } | |
1948 | ||
1949 | out: | |
1950 | if (primary_if) | |
82047ad7 | 1951 | batadv_hardif_put(primary_if); |
d56b1705 MH |
1952 | return 0; |
1953 | } | |
1954 | ||
1955 | /** | |
1956 | * batadv_nc_init_debugfs - create nc folder and related files in debugfs | |
1957 | * @bat_priv: the bat priv with all the soft interface information | |
672e7978 SE |
1958 | * |
1959 | * Return: 0 on success or negative error number in case of failure | |
d56b1705 MH |
1960 | */ |
1961 | int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) | |
1962 | { | |
1963 | struct dentry *nc_dir, *file; | |
1964 | ||
1965 | nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir); | |
1966 | if (!nc_dir) | |
1967 | goto out; | |
1968 | ||
1969 | file = debugfs_create_u8("min_tq", S_IRUGO | S_IWUSR, nc_dir, | |
1970 | &bat_priv->nc.min_tq); | |
1971 | if (!file) | |
1972 | goto out; | |
1973 | ||
95332477 MH |
1974 | file = debugfs_create_u32("max_fwd_delay", S_IRUGO | S_IWUSR, nc_dir, |
1975 | &bat_priv->nc.max_fwd_delay); | |
1976 | if (!file) | |
1977 | goto out; | |
1978 | ||
612d2b4f MH |
1979 | file = debugfs_create_u32("max_buffer_time", S_IRUGO | S_IWUSR, nc_dir, |
1980 | &bat_priv->nc.max_buffer_time); | |
1981 | if (!file) | |
1982 | goto out; | |
1983 | ||
d56b1705 MH |
1984 | return 0; |
1985 | ||
1986 | out: | |
1987 | return -ENOMEM; | |
1988 | } |