Commit | Line | Data |
---|---|---|
7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6b1aea8c | 2 | /* Copyright (C) 2012-2018 B.A.T.M.A.N. contributors: |
d353d8d4 MH |
3 | * |
4 | * Martin Hundebøll, Jeppe Ledet-Pedersen | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of version 2 of the GNU General Public | |
8 | * License as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
ebf38fb7 | 16 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
d353d8d4 MH |
17 | */ |
18 | ||
1e2c2a4f SE |
19 | #include "network-coding.h" |
20 | #include "main.h" | |
21 | ||
22 | #include <linux/atomic.h> | |
4635469f | 23 | #include <linux/bitops.h> |
1e2c2a4f SE |
24 | #include <linux/byteorder/generic.h> |
25 | #include <linux/compiler.h> | |
d56b1705 | 26 | #include <linux/debugfs.h> |
1e2c2a4f SE |
27 | #include <linux/errno.h> |
28 | #include <linux/etherdevice.h> | |
b92b94ac | 29 | #include <linux/gfp.h> |
1e2c2a4f SE |
30 | #include <linux/if_ether.h> |
31 | #include <linux/if_packet.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/jhash.h> | |
34 | #include <linux/jiffies.h> | |
35 | #include <linux/kernel.h> | |
daf99b48 | 36 | #include <linux/kref.h> |
1e2c2a4f SE |
37 | #include <linux/list.h> |
38 | #include <linux/lockdep.h> | |
3a64469e | 39 | #include <linux/net.h> |
1e2c2a4f SE |
40 | #include <linux/netdevice.h> |
41 | #include <linux/printk.h> | |
42 | #include <linux/random.h> | |
43 | #include <linux/rculist.h> | |
44 | #include <linux/rcupdate.h> | |
45 | #include <linux/seq_file.h> | |
46 | #include <linux/skbuff.h> | |
47 | #include <linux/slab.h> | |
48 | #include <linux/spinlock.h> | |
1e2c2a4f SE |
49 | #include <linux/stddef.h> |
50 | #include <linux/string.h> | |
51 | #include <linux/workqueue.h> | |
fec149f5 | 52 | #include <uapi/linux/batadv_packet.h> |
d56b1705 | 53 | |
1e2c2a4f | 54 | #include "hard-interface.h" |
95332477 | 55 | #include "hash.h" |
ba412080 | 56 | #include "log.h" |
d56b1705 | 57 | #include "originator.h" |
2df5278b | 58 | #include "routing.h" |
1e2c2a4f | 59 | #include "send.h" |
1f8dce49 | 60 | #include "tvlv.h" |
d353d8d4 | 61 | |
95332477 | 62 | static struct lock_class_key batadv_nc_coding_hash_lock_class_key; |
612d2b4f | 63 | static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; |
95332477 | 64 | |
d353d8d4 | 65 | static void batadv_nc_worker(struct work_struct *work); |
2df5278b MH |
66 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, |
67 | struct batadv_hard_iface *recv_if); | |
d353d8d4 | 68 | |
6c519bad | 69 | /** |
7e9a8c2c | 70 | * batadv_nc_init() - one-time initialization for network coding |
672e7978 SE |
71 | * |
72 | * Return: 0 on success or negative error number in case of failure | |
6c519bad MS |
73 | */ |
74 | int __init batadv_nc_init(void) | |
75 | { | |
76 | int ret; | |
77 | ||
78 | /* Register our packet type */ | |
79 | ret = batadv_recv_handler_register(BATADV_CODED, | |
80 | batadv_nc_recv_coded_packet); | |
81 | ||
82 | return ret; | |
83 | } | |
84 | ||
d353d8d4 | 85 | /** |
7e9a8c2c | 86 | * batadv_nc_start_timer() - initialise the nc periodic worker |
d353d8d4 MH |
87 | * @bat_priv: the bat priv with all the soft interface information |
88 | */ | |
89 | static void batadv_nc_start_timer(struct batadv_priv *bat_priv) | |
90 | { | |
91 | queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work, | |
92 | msecs_to_jiffies(10)); | |
93 | } | |
94 | ||
3f4841ff | 95 | /** |
7e9a8c2c | 96 | * batadv_nc_tvlv_container_update() - update the network coding tvlv container |
3f4841ff ML |
97 | * after network coding setting change |
98 | * @bat_priv: the bat priv with all the soft interface information | |
99 | */ | |
100 | static void batadv_nc_tvlv_container_update(struct batadv_priv *bat_priv) | |
101 | { | |
102 | char nc_mode; | |
103 | ||
104 | nc_mode = atomic_read(&bat_priv->network_coding); | |
105 | ||
106 | switch (nc_mode) { | |
107 | case 0: | |
108 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
109 | break; | |
110 | case 1: | |
111 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_NC, 1, | |
112 | NULL, 0); | |
113 | break; | |
114 | } | |
115 | } | |
116 | ||
117 | /** | |
7e9a8c2c | 118 | * batadv_nc_status_update() - update the network coding tvlv container after |
3f4841ff ML |
119 | * network coding setting change |
120 | * @net_dev: the soft interface net device | |
121 | */ | |
122 | void batadv_nc_status_update(struct net_device *net_dev) | |
123 | { | |
124 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
f138694b | 125 | |
3f4841ff ML |
126 | batadv_nc_tvlv_container_update(bat_priv); |
127 | } | |
128 | ||
129 | /** | |
7e9a8c2c | 130 | * batadv_nc_tvlv_ogm_handler_v1() - process incoming nc tvlv container |
3f4841ff ML |
131 | * @bat_priv: the bat priv with all the soft interface information |
132 | * @orig: the orig_node of the ogm | |
133 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
134 | * @tvlv_value: tvlv buffer containing the gateway data | |
135 | * @tvlv_value_len: tvlv buffer length | |
136 | */ | |
137 | static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
138 | struct batadv_orig_node *orig, | |
6b5e971a SE |
139 | u8 flags, |
140 | void *tvlv_value, u16 tvlv_value_len) | |
3f4841ff ML |
141 | { |
142 | if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) | |
4635469f | 143 | clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); |
3f4841ff | 144 | else |
4635469f | 145 | set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); |
3f4841ff ML |
146 | } |
147 | ||
d353d8d4 | 148 | /** |
7e9a8c2c | 149 | * batadv_nc_mesh_init() - initialise coding hash table and start house keeping |
d353d8d4 | 150 | * @bat_priv: the bat priv with all the soft interface information |
672e7978 SE |
151 | * |
152 | * Return: 0 on success or negative error number in case of failure | |
d353d8d4 | 153 | */ |
6c519bad | 154 | int batadv_nc_mesh_init(struct batadv_priv *bat_priv) |
d353d8d4 | 155 | { |
95332477 | 156 | bat_priv->nc.timestamp_fwd_flush = jiffies; |
612d2b4f | 157 | bat_priv->nc.timestamp_sniffed_purge = jiffies; |
95332477 | 158 | |
612d2b4f | 159 | if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) |
95332477 MH |
160 | return 0; |
161 | ||
162 | bat_priv->nc.coding_hash = batadv_hash_new(128); | |
163 | if (!bat_priv->nc.coding_hash) | |
164 | goto err; | |
165 | ||
166 | batadv_hash_set_lock_class(bat_priv->nc.coding_hash, | |
167 | &batadv_nc_coding_hash_lock_class_key); | |
168 | ||
612d2b4f MH |
169 | bat_priv->nc.decoding_hash = batadv_hash_new(128); |
170 | if (!bat_priv->nc.decoding_hash) | |
171 | goto err; | |
172 | ||
f44d5407 | 173 | batadv_hash_set_lock_class(bat_priv->nc.decoding_hash, |
612d2b4f MH |
174 | &batadv_nc_decoding_hash_lock_class_key); |
175 | ||
d353d8d4 MH |
176 | INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); |
177 | batadv_nc_start_timer(bat_priv); | |
178 | ||
3f4841ff ML |
179 | batadv_tvlv_handler_register(bat_priv, batadv_nc_tvlv_ogm_handler_v1, |
180 | NULL, BATADV_TVLV_NC, 1, | |
181 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
182 | batadv_nc_tvlv_container_update(bat_priv); | |
d353d8d4 | 183 | return 0; |
95332477 MH |
184 | |
185 | err: | |
186 | return -ENOMEM; | |
d353d8d4 MH |
187 | } |
188 | ||
189 | /** | |
7e9a8c2c | 190 | * batadv_nc_init_bat_priv() - initialise the nc specific bat_priv variables |
d353d8d4 MH |
191 | * @bat_priv: the bat priv with all the soft interface information |
192 | */ | |
193 | void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) | |
194 | { | |
dab7b621 | 195 | atomic_set(&bat_priv->network_coding, 0); |
d56b1705 | 196 | bat_priv->nc.min_tq = 200; |
95332477 | 197 | bat_priv->nc.max_fwd_delay = 10; |
612d2b4f | 198 | bat_priv->nc.max_buffer_time = 200; |
d56b1705 MH |
199 | } |
200 | ||
201 | /** | |
7e9a8c2c | 202 | * batadv_nc_init_orig() - initialise the nc fields of an orig_node |
d56b1705 MH |
203 | * @orig_node: the orig_node which is going to be initialised |
204 | */ | |
205 | void batadv_nc_init_orig(struct batadv_orig_node *orig_node) | |
206 | { | |
207 | INIT_LIST_HEAD(&orig_node->in_coding_list); | |
208 | INIT_LIST_HEAD(&orig_node->out_coding_list); | |
209 | spin_lock_init(&orig_node->in_coding_list_lock); | |
210 | spin_lock_init(&orig_node->out_coding_list_lock); | |
211 | } | |
212 | ||
213 | /** | |
7e9a8c2c SE |
214 | * batadv_nc_node_release() - release nc_node from lists and queue for free |
215 | * after rcu grace period | |
daf99b48 | 216 | * @ref: kref pointer of the nc_node |
d56b1705 | 217 | */ |
daf99b48 | 218 | static void batadv_nc_node_release(struct kref *ref) |
d56b1705 | 219 | { |
daf99b48 SE |
220 | struct batadv_nc_node *nc_node; |
221 | ||
222 | nc_node = container_of(ref, struct batadv_nc_node, refcount); | |
223 | ||
5d967310 | 224 | batadv_orig_node_put(nc_node->orig_node); |
44e8e7e9 | 225 | kfree_rcu(nc_node, rcu); |
d56b1705 MH |
226 | } |
227 | ||
228 | /** | |
7e9a8c2c | 229 | * batadv_nc_node_put() - decrement the nc_node refcounter and possibly |
44e8e7e9 | 230 | * release it |
daf99b48 | 231 | * @nc_node: nc_node to be free'd |
d56b1705 | 232 | */ |
27ad7545 | 233 | static void batadv_nc_node_put(struct batadv_nc_node *nc_node) |
d56b1705 | 234 | { |
daf99b48 | 235 | kref_put(&nc_node->refcount, batadv_nc_node_release); |
d56b1705 MH |
236 | } |
237 | ||
95332477 | 238 | /** |
7e9a8c2c SE |
239 | * batadv_nc_path_release() - release nc_path from lists and queue for free |
240 | * after rcu grace period | |
727e0cd5 SE |
241 | * @ref: kref pointer of the nc_path |
242 | */ | |
243 | static void batadv_nc_path_release(struct kref *ref) | |
244 | { | |
245 | struct batadv_nc_path *nc_path; | |
246 | ||
247 | nc_path = container_of(ref, struct batadv_nc_path, refcount); | |
248 | ||
249 | kfree_rcu(nc_path, rcu); | |
250 | } | |
251 | ||
252 | /** | |
7e9a8c2c | 253 | * batadv_nc_path_put() - decrement the nc_path refcounter and possibly |
727e0cd5 SE |
254 | * release it |
255 | * @nc_path: nc_path to be free'd | |
95332477 | 256 | */ |
5fff2825 | 257 | static void batadv_nc_path_put(struct batadv_nc_path *nc_path) |
95332477 | 258 | { |
727e0cd5 | 259 | kref_put(&nc_path->refcount, batadv_nc_path_release); |
95332477 MH |
260 | } |
261 | ||
262 | /** | |
7e9a8c2c | 263 | * batadv_nc_packet_free() - frees nc packet |
95332477 | 264 | * @nc_packet: the nc packet to free |
bd687fe4 | 265 | * @dropped: whether the packet is freed because is is dropped |
95332477 | 266 | */ |
bd687fe4 SE |
267 | static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet, |
268 | bool dropped) | |
95332477 | 269 | { |
bd687fe4 SE |
270 | if (dropped) |
271 | kfree_skb(nc_packet->skb); | |
272 | else | |
273 | consume_skb(nc_packet->skb); | |
274 | ||
5fff2825 | 275 | batadv_nc_path_put(nc_packet->nc_path); |
95332477 MH |
276 | kfree(nc_packet); |
277 | } | |
278 | ||
d56b1705 | 279 | /** |
7e9a8c2c | 280 | * batadv_nc_to_purge_nc_node() - checks whether an nc node has to be purged |
d56b1705 MH |
281 | * @bat_priv: the bat priv with all the soft interface information |
282 | * @nc_node: the nc node to check | |
283 | * | |
62fe710f | 284 | * Return: true if the entry has to be purged now, false otherwise |
d56b1705 MH |
285 | */ |
286 | static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, | |
287 | struct batadv_nc_node *nc_node) | |
288 | { | |
289 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
290 | return true; | |
291 | ||
292 | return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT); | |
293 | } | |
294 | ||
95332477 | 295 | /** |
7e9a8c2c | 296 | * batadv_nc_to_purge_nc_path_coding() - checks whether an nc path has timed out |
95332477 MH |
297 | * @bat_priv: the bat priv with all the soft interface information |
298 | * @nc_path: the nc path to check | |
299 | * | |
62fe710f | 300 | * Return: true if the entry has to be purged now, false otherwise |
95332477 MH |
301 | */ |
302 | static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, | |
303 | struct batadv_nc_path *nc_path) | |
304 | { | |
305 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
306 | return true; | |
307 | ||
308 | /* purge the path when no packets has been added for 10 times the | |
309 | * max_fwd_delay time | |
310 | */ | |
311 | return batadv_has_timed_out(nc_path->last_valid, | |
312 | bat_priv->nc.max_fwd_delay * 10); | |
313 | } | |
314 | ||
612d2b4f | 315 | /** |
7e9a8c2c SE |
316 | * batadv_nc_to_purge_nc_path_decoding() - checks whether an nc path has timed |
317 | * out | |
612d2b4f MH |
318 | * @bat_priv: the bat priv with all the soft interface information |
319 | * @nc_path: the nc path to check | |
320 | * | |
62fe710f | 321 | * Return: true if the entry has to be purged now, false otherwise |
612d2b4f MH |
322 | */ |
323 | static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, | |
324 | struct batadv_nc_path *nc_path) | |
325 | { | |
326 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
327 | return true; | |
328 | ||
329 | /* purge the path when no packets has been added for 10 times the | |
330 | * max_buffer time | |
331 | */ | |
332 | return batadv_has_timed_out(nc_path->last_valid, | |
fc1f8693 | 333 | bat_priv->nc.max_buffer_time * 10); |
612d2b4f MH |
334 | } |
335 | ||
d56b1705 | 336 | /** |
7e9a8c2c | 337 | * batadv_nc_purge_orig_nc_nodes() - go through list of nc nodes and purge stale |
d56b1705 MH |
338 | * entries |
339 | * @bat_priv: the bat priv with all the soft interface information | |
340 | * @list: list of nc nodes | |
341 | * @lock: nc node list lock | |
342 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
343 | * not. This function takes the nc node as argument and has to return | |
344 | * a boolean value: true if the entry has to be deleted, false | |
345 | * otherwise | |
346 | */ | |
347 | static void | |
348 | batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, | |
349 | struct list_head *list, | |
350 | spinlock_t *lock, | |
351 | bool (*to_purge)(struct batadv_priv *, | |
352 | struct batadv_nc_node *)) | |
353 | { | |
354 | struct batadv_nc_node *nc_node, *nc_node_tmp; | |
355 | ||
356 | /* For each nc_node in list */ | |
357 | spin_lock_bh(lock); | |
358 | list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) { | |
359 | /* if an helper function has been passed as parameter, | |
360 | * ask it if the entry has to be purged or not | |
361 | */ | |
362 | if (to_purge && !to_purge(bat_priv, nc_node)) | |
363 | continue; | |
364 | ||
365 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
366 | "Removing nc_node %pM -> %pM\n", | |
367 | nc_node->addr, nc_node->orig_node->orig); | |
368 | list_del_rcu(&nc_node->list); | |
27ad7545 | 369 | batadv_nc_node_put(nc_node); |
d56b1705 MH |
370 | } |
371 | spin_unlock_bh(lock); | |
372 | } | |
373 | ||
374 | /** | |
7e9a8c2c | 375 | * batadv_nc_purge_orig() - purges all nc node data attached of the given |
d56b1705 MH |
376 | * originator |
377 | * @bat_priv: the bat priv with all the soft interface information | |
378 | * @orig_node: orig_node with the nc node entries to be purged | |
379 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
380 | * not. This function takes the nc node as argument and has to return | |
381 | * a boolean value: true is the entry has to be deleted, false | |
382 | * otherwise | |
383 | */ | |
384 | void batadv_nc_purge_orig(struct batadv_priv *bat_priv, | |
385 | struct batadv_orig_node *orig_node, | |
386 | bool (*to_purge)(struct batadv_priv *, | |
387 | struct batadv_nc_node *)) | |
388 | { | |
389 | /* Check ingoing nc_node's of this orig_node */ | |
390 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list, | |
391 | &orig_node->in_coding_list_lock, | |
392 | to_purge); | |
393 | ||
394 | /* Check outgoing nc_node's of this orig_node */ | |
395 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list, | |
396 | &orig_node->out_coding_list_lock, | |
397 | to_purge); | |
398 | } | |
399 | ||
400 | /** | |
7e9a8c2c SE |
401 | * batadv_nc_purge_orig_hash() - traverse entire originator hash to check if |
402 | * they have timed out nc nodes | |
d56b1705 MH |
403 | * @bat_priv: the bat priv with all the soft interface information |
404 | */ | |
405 | static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) | |
406 | { | |
407 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
408 | struct hlist_head *head; | |
409 | struct batadv_orig_node *orig_node; | |
6b5e971a | 410 | u32 i; |
d56b1705 MH |
411 | |
412 | if (!hash) | |
413 | return; | |
414 | ||
415 | /* For each orig_node */ | |
416 | for (i = 0; i < hash->size; i++) { | |
417 | head = &hash->table[i]; | |
418 | ||
419 | rcu_read_lock(); | |
420 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) | |
421 | batadv_nc_purge_orig(bat_priv, orig_node, | |
422 | batadv_nc_to_purge_nc_node); | |
423 | rcu_read_unlock(); | |
424 | } | |
d353d8d4 MH |
425 | } |
426 | ||
95332477 | 427 | /** |
7e9a8c2c | 428 | * batadv_nc_purge_paths() - traverse all nc paths part of the hash and remove |
95332477 MH |
429 | * unused ones |
430 | * @bat_priv: the bat priv with all the soft interface information | |
431 | * @hash: hash table containing the nc paths to check | |
432 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
433 | * not. This function takes the nc node as argument and has to return | |
434 | * a boolean value: true is the entry has to be deleted, false | |
435 | * otherwise | |
436 | */ | |
437 | static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, | |
438 | struct batadv_hashtable *hash, | |
439 | bool (*to_purge)(struct batadv_priv *, | |
440 | struct batadv_nc_path *)) | |
441 | { | |
442 | struct hlist_head *head; | |
443 | struct hlist_node *node_tmp; | |
444 | struct batadv_nc_path *nc_path; | |
445 | spinlock_t *lock; /* Protects lists in hash */ | |
6b5e971a | 446 | u32 i; |
95332477 MH |
447 | |
448 | for (i = 0; i < hash->size; i++) { | |
449 | head = &hash->table[i]; | |
450 | lock = &hash->list_locks[i]; | |
451 | ||
452 | /* For each nc_path in this bin */ | |
453 | spin_lock_bh(lock); | |
454 | hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) { | |
455 | /* if an helper function has been passed as parameter, | |
456 | * ask it if the entry has to be purged or not | |
457 | */ | |
458 | if (to_purge && !to_purge(bat_priv, nc_path)) | |
459 | continue; | |
460 | ||
461 | /* purging an non-empty nc_path should never happen, but | |
462 | * is observed under high CPU load. Delay the purging | |
463 | * until next iteration to allow the packet_list to be | |
464 | * emptied first. | |
465 | */ | |
466 | if (!unlikely(list_empty(&nc_path->packet_list))) { | |
467 | net_ratelimited_function(printk, | |
468 | KERN_WARNING | |
469 | "Skipping free of non-empty nc_path (%pM -> %pM)!\n", | |
470 | nc_path->prev_hop, | |
471 | nc_path->next_hop); | |
472 | continue; | |
473 | } | |
474 | ||
475 | /* nc_path is unused, so remove it */ | |
476 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
477 | "Remove nc_path %pM -> %pM\n", | |
478 | nc_path->prev_hop, nc_path->next_hop); | |
479 | hlist_del_rcu(&nc_path->hash_entry); | |
5fff2825 | 480 | batadv_nc_path_put(nc_path); |
95332477 MH |
481 | } |
482 | spin_unlock_bh(lock); | |
483 | } | |
484 | } | |
485 | ||
486 | /** | |
7e9a8c2c | 487 | * batadv_nc_hash_key_gen() - computes the nc_path hash key |
95332477 MH |
488 | * @key: buffer to hold the final hash key |
489 | * @src: source ethernet mac address going into the hash key | |
490 | * @dst: destination ethernet mac address going into the hash key | |
491 | */ | |
492 | static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, | |
493 | const char *dst) | |
494 | { | |
495 | memcpy(key->prev_hop, src, sizeof(key->prev_hop)); | |
496 | memcpy(key->next_hop, dst, sizeof(key->next_hop)); | |
497 | } | |
498 | ||
499 | /** | |
7e9a8c2c | 500 | * batadv_nc_hash_choose() - compute the hash value for an nc path |
95332477 MH |
501 | * @data: data to hash |
502 | * @size: size of the hash table | |
503 | * | |
62fe710f | 504 | * Return: the selected index in the hash table for the given data. |
95332477 | 505 | */ |
6b5e971a | 506 | static u32 batadv_nc_hash_choose(const void *data, u32 size) |
95332477 MH |
507 | { |
508 | const struct batadv_nc_path *nc_path = data; | |
6b5e971a | 509 | u32 hash = 0; |
95332477 | 510 | |
36fd61cb SE |
511 | hash = jhash(&nc_path->prev_hop, sizeof(nc_path->prev_hop), hash); |
512 | hash = jhash(&nc_path->next_hop, sizeof(nc_path->next_hop), hash); | |
95332477 MH |
513 | |
514 | return hash % size; | |
515 | } | |
516 | ||
517 | /** | |
7e9a8c2c | 518 | * batadv_nc_hash_compare() - comparing function used in the network coding hash |
95332477 MH |
519 | * tables |
520 | * @node: node in the local table | |
521 | * @data2: second object to compare the node to | |
522 | * | |
4b426b10 | 523 | * Return: true if the two entry are the same, false otherwise |
95332477 | 524 | */ |
4b426b10 SE |
525 | static bool batadv_nc_hash_compare(const struct hlist_node *node, |
526 | const void *data2) | |
95332477 MH |
527 | { |
528 | const struct batadv_nc_path *nc_path1, *nc_path2; | |
529 | ||
530 | nc_path1 = container_of(node, struct batadv_nc_path, hash_entry); | |
531 | nc_path2 = data2; | |
532 | ||
533 | /* Return 1 if the two keys are identical */ | |
676970e5 | 534 | if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop)) |
4b426b10 | 535 | return false; |
95332477 | 536 | |
676970e5 | 537 | if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop)) |
4b426b10 | 538 | return false; |
95332477 | 539 | |
4b426b10 | 540 | return true; |
95332477 MH |
541 | } |
542 | ||
543 | /** | |
7e9a8c2c | 544 | * batadv_nc_hash_find() - search for an existing nc path and return it |
95332477 MH |
545 | * @hash: hash table containing the nc path |
546 | * @data: search key | |
547 | * | |
62fe710f | 548 | * Return: the nc_path if found, NULL otherwise. |
95332477 MH |
549 | */ |
550 | static struct batadv_nc_path * | |
551 | batadv_nc_hash_find(struct batadv_hashtable *hash, | |
552 | void *data) | |
553 | { | |
554 | struct hlist_head *head; | |
555 | struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; | |
556 | int index; | |
557 | ||
558 | if (!hash) | |
559 | return NULL; | |
560 | ||
561 | index = batadv_nc_hash_choose(data, hash->size); | |
562 | head = &hash->table[index]; | |
563 | ||
564 | rcu_read_lock(); | |
565 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
566 | if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) | |
567 | continue; | |
568 | ||
727e0cd5 | 569 | if (!kref_get_unless_zero(&nc_path->refcount)) |
95332477 MH |
570 | continue; |
571 | ||
572 | nc_path_tmp = nc_path; | |
573 | break; | |
574 | } | |
575 | rcu_read_unlock(); | |
576 | ||
577 | return nc_path_tmp; | |
578 | } | |
579 | ||
580 | /** | |
7e9a8c2c | 581 | * batadv_nc_send_packet() - send non-coded packet and free nc_packet struct |
95332477 MH |
582 | * @nc_packet: the nc packet to send |
583 | */ | |
584 | static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) | |
585 | { | |
95d39278 | 586 | batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node); |
95332477 | 587 | nc_packet->skb = NULL; |
bd687fe4 | 588 | batadv_nc_packet_free(nc_packet, false); |
95332477 MH |
589 | } |
590 | ||
612d2b4f | 591 | /** |
7e9a8c2c | 592 | * batadv_nc_sniffed_purge() - Checks timestamp of given sniffed nc_packet. |
612d2b4f MH |
593 | * @bat_priv: the bat priv with all the soft interface information |
594 | * @nc_path: the nc path the packet belongs to | |
595 | * @nc_packet: the nc packet to be checked | |
596 | * | |
597 | * Checks whether the given sniffed (overheard) nc_packet has hit its buffering | |
598 | * timeout. If so, the packet is no longer kept and the entry deleted from the | |
599 | * queue. Has to be called with the appropriate locks. | |
600 | * | |
62fe710f | 601 | * Return: false as soon as the entry in the fifo queue has not been timed out |
612d2b4f MH |
602 | * yet and true otherwise. |
603 | */ | |
604 | static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, | |
605 | struct batadv_nc_path *nc_path, | |
606 | struct batadv_nc_packet *nc_packet) | |
607 | { | |
608 | unsigned long timeout = bat_priv->nc.max_buffer_time; | |
609 | bool res = false; | |
610 | ||
2c72d655 SE |
611 | lockdep_assert_held(&nc_path->packet_list_lock); |
612 | ||
612d2b4f MH |
613 | /* Packets are added to tail, so the remaining packets did not time |
614 | * out and we can stop processing the current queue | |
615 | */ | |
616 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
617 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
618 | goto out; | |
619 | ||
620 | /* purge nc packet */ | |
621 | list_del(&nc_packet->list); | |
bd687fe4 | 622 | batadv_nc_packet_free(nc_packet, true); |
612d2b4f MH |
623 | |
624 | res = true; | |
625 | ||
626 | out: | |
627 | return res; | |
628 | } | |
629 | ||
95332477 | 630 | /** |
7e9a8c2c | 631 | * batadv_nc_fwd_flush() - Checks the timestamp of the given nc packet. |
95332477 MH |
632 | * @bat_priv: the bat priv with all the soft interface information |
633 | * @nc_path: the nc path the packet belongs to | |
634 | * @nc_packet: the nc packet to be checked | |
635 | * | |
636 | * Checks whether the given nc packet has hit its forward timeout. If so, the | |
637 | * packet is no longer delayed, immediately sent and the entry deleted from the | |
638 | * queue. Has to be called with the appropriate locks. | |
639 | * | |
62fe710f | 640 | * Return: false as soon as the entry in the fifo queue has not been timed out |
95332477 MH |
641 | * yet and true otherwise. |
642 | */ | |
643 | static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, | |
644 | struct batadv_nc_path *nc_path, | |
645 | struct batadv_nc_packet *nc_packet) | |
646 | { | |
647 | unsigned long timeout = bat_priv->nc.max_fwd_delay; | |
648 | ||
2c72d655 SE |
649 | lockdep_assert_held(&nc_path->packet_list_lock); |
650 | ||
95332477 MH |
651 | /* Packets are added to tail, so the remaining packets did not time |
652 | * out and we can stop processing the current queue | |
653 | */ | |
654 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
655 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
656 | return false; | |
657 | ||
658 | /* Send packet */ | |
659 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); | |
660 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
661 | nc_packet->skb->len + ETH_HLEN); | |
662 | list_del(&nc_packet->list); | |
663 | batadv_nc_send_packet(nc_packet); | |
664 | ||
665 | return true; | |
666 | } | |
667 | ||
668 | /** | |
7e9a8c2c SE |
669 | * batadv_nc_process_nc_paths() - traverse given nc packet pool and free timed |
670 | * out nc packets | |
95332477 MH |
671 | * @bat_priv: the bat priv with all the soft interface information |
672 | * @hash: to be processed hash table | |
673 | * @process_fn: Function called to process given nc packet. Should return true | |
674 | * to encourage this function to proceed with the next packet. | |
675 | * Otherwise the rest of the current queue is skipped. | |
676 | */ | |
677 | static void | |
678 | batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, | |
679 | struct batadv_hashtable *hash, | |
680 | bool (*process_fn)(struct batadv_priv *, | |
681 | struct batadv_nc_path *, | |
682 | struct batadv_nc_packet *)) | |
683 | { | |
684 | struct hlist_head *head; | |
685 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
686 | struct batadv_nc_path *nc_path; | |
687 | bool ret; | |
688 | int i; | |
689 | ||
690 | if (!hash) | |
691 | return; | |
692 | ||
693 | /* Loop hash table bins */ | |
694 | for (i = 0; i < hash->size; i++) { | |
695 | head = &hash->table[i]; | |
696 | ||
697 | /* Loop coding paths */ | |
698 | rcu_read_lock(); | |
699 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
700 | /* Loop packets */ | |
701 | spin_lock_bh(&nc_path->packet_list_lock); | |
702 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
703 | &nc_path->packet_list, list) { | |
704 | ret = process_fn(bat_priv, nc_path, nc_packet); | |
705 | if (!ret) | |
706 | break; | |
707 | } | |
708 | spin_unlock_bh(&nc_path->packet_list_lock); | |
709 | } | |
710 | rcu_read_unlock(); | |
711 | } | |
712 | } | |
713 | ||
d353d8d4 | 714 | /** |
7e9a8c2c SE |
715 | * batadv_nc_worker() - periodic task for house keeping related to network |
716 | * coding | |
d353d8d4 MH |
717 | * @work: kernel work struct |
718 | */ | |
719 | static void batadv_nc_worker(struct work_struct *work) | |
720 | { | |
721 | struct delayed_work *delayed_work; | |
722 | struct batadv_priv_nc *priv_nc; | |
723 | struct batadv_priv *bat_priv; | |
95332477 | 724 | unsigned long timeout; |
d353d8d4 | 725 | |
4ba4bc0f | 726 | delayed_work = to_delayed_work(work); |
d353d8d4 MH |
727 | priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); |
728 | bat_priv = container_of(priv_nc, struct batadv_priv, nc); | |
729 | ||
d56b1705 | 730 | batadv_nc_purge_orig_hash(bat_priv); |
95332477 MH |
731 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, |
732 | batadv_nc_to_purge_nc_path_coding); | |
612d2b4f MH |
733 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, |
734 | batadv_nc_to_purge_nc_path_decoding); | |
95332477 MH |
735 | |
736 | timeout = bat_priv->nc.max_fwd_delay; | |
737 | ||
738 | if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { | |
739 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, | |
740 | batadv_nc_fwd_flush); | |
741 | bat_priv->nc.timestamp_fwd_flush = jiffies; | |
742 | } | |
d56b1705 | 743 | |
612d2b4f MH |
744 | if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, |
745 | bat_priv->nc.max_buffer_time)) { | |
746 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, | |
747 | batadv_nc_sniffed_purge); | |
748 | bat_priv->nc.timestamp_sniffed_purge = jiffies; | |
749 | } | |
750 | ||
d353d8d4 MH |
751 | /* Schedule a new check */ |
752 | batadv_nc_start_timer(bat_priv); | |
753 | } | |
754 | ||
d56b1705 | 755 | /** |
7e9a8c2c SE |
756 | * batadv_can_nc_with_orig() - checks whether the given orig node is suitable |
757 | * for coding or not | |
d56b1705 MH |
758 | * @bat_priv: the bat priv with all the soft interface information |
759 | * @orig_node: neighboring orig node which may be used as nc candidate | |
760 | * @ogm_packet: incoming ogm packet also used for the checks | |
761 | * | |
62fe710f | 762 | * Return: true if: |
d56b1705 MH |
763 | * 1) The OGM must have the most recent sequence number. |
764 | * 2) The TTL must be decremented by one and only one. | |
765 | * 3) The OGM must be received from the first hop from orig_node. | |
766 | * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. | |
767 | */ | |
768 | static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, | |
769 | struct batadv_orig_node *orig_node, | |
770 | struct batadv_ogm_packet *ogm_packet) | |
771 | { | |
7351a482 | 772 | struct batadv_orig_ifinfo *orig_ifinfo; |
6b5e971a SE |
773 | u32 last_real_seqno; |
774 | u8 last_ttl; | |
7351a482 SW |
775 | |
776 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, BATADV_IF_DEFAULT); | |
777 | if (!orig_ifinfo) | |
d56b1705 | 778 | return false; |
7351a482 SW |
779 | |
780 | last_ttl = orig_ifinfo->last_ttl; | |
781 | last_real_seqno = orig_ifinfo->last_real_seqno; | |
35f94779 | 782 | batadv_orig_ifinfo_put(orig_ifinfo); |
7351a482 SW |
783 | |
784 | if (last_real_seqno != ntohl(ogm_packet->seqno)) | |
785 | return false; | |
786 | if (last_ttl != ogm_packet->ttl + 1) | |
d56b1705 MH |
787 | return false; |
788 | if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) | |
789 | return false; | |
790 | if (ogm_packet->tq < bat_priv->nc.min_tq) | |
791 | return false; | |
792 | ||
793 | return true; | |
794 | } | |
795 | ||
796 | /** | |
7e9a8c2c | 797 | * batadv_nc_find_nc_node() - search for an existing nc node and return it |
d56b1705 MH |
798 | * @orig_node: orig node originating the ogm packet |
799 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
800 | * (can be equal to orig_node) | |
801 | * @in_coding: traverse incoming or outgoing network coding list | |
802 | * | |
62fe710f | 803 | * Return: the nc_node if found, NULL otherwise. |
d56b1705 | 804 | */ |
6fc77a54 SE |
805 | static struct batadv_nc_node * |
806 | batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, | |
807 | struct batadv_orig_node *orig_neigh_node, | |
808 | bool in_coding) | |
d56b1705 MH |
809 | { |
810 | struct batadv_nc_node *nc_node, *nc_node_out = NULL; | |
811 | struct list_head *list; | |
812 | ||
813 | if (in_coding) | |
814 | list = &orig_neigh_node->in_coding_list; | |
815 | else | |
816 | list = &orig_neigh_node->out_coding_list; | |
817 | ||
818 | /* Traverse list of nc_nodes to orig_node */ | |
819 | rcu_read_lock(); | |
820 | list_for_each_entry_rcu(nc_node, list, list) { | |
821 | if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) | |
822 | continue; | |
823 | ||
daf99b48 | 824 | if (!kref_get_unless_zero(&nc_node->refcount)) |
d56b1705 MH |
825 | continue; |
826 | ||
827 | /* Found a match */ | |
828 | nc_node_out = nc_node; | |
829 | break; | |
830 | } | |
831 | rcu_read_unlock(); | |
832 | ||
833 | return nc_node_out; | |
834 | } | |
835 | ||
836 | /** | |
7e9a8c2c | 837 | * batadv_nc_get_nc_node() - retrieves an nc node or creates the entry if it was |
d56b1705 MH |
838 | * not found |
839 | * @bat_priv: the bat priv with all the soft interface information | |
840 | * @orig_node: orig node originating the ogm packet | |
841 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
842 | * (can be equal to orig_node) | |
843 | * @in_coding: traverse incoming or outgoing network coding list | |
844 | * | |
62fe710f | 845 | * Return: the nc_node if found or created, NULL in case of an error. |
d56b1705 | 846 | */ |
6fc77a54 SE |
847 | static struct batadv_nc_node * |
848 | batadv_nc_get_nc_node(struct batadv_priv *bat_priv, | |
849 | struct batadv_orig_node *orig_node, | |
850 | struct batadv_orig_node *orig_neigh_node, | |
851 | bool in_coding) | |
d56b1705 MH |
852 | { |
853 | struct batadv_nc_node *nc_node; | |
854 | spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ | |
855 | struct list_head *list; | |
856 | ||
fa122fec SE |
857 | /* Select ingoing or outgoing coding node */ |
858 | if (in_coding) { | |
859 | lock = &orig_neigh_node->in_coding_list_lock; | |
860 | list = &orig_neigh_node->in_coding_list; | |
861 | } else { | |
862 | lock = &orig_neigh_node->out_coding_list_lock; | |
863 | list = &orig_neigh_node->out_coding_list; | |
864 | } | |
865 | ||
866 | spin_lock_bh(lock); | |
867 | ||
d56b1705 MH |
868 | /* Check if nc_node is already added */ |
869 | nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); | |
870 | ||
871 | /* Node found */ | |
872 | if (nc_node) | |
fa122fec | 873 | goto unlock; |
d56b1705 MH |
874 | |
875 | nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); | |
876 | if (!nc_node) | |
fa122fec | 877 | goto unlock; |
d56b1705 | 878 | |
d56b1705 MH |
879 | /* Initialize nc_node */ |
880 | INIT_LIST_HEAD(&nc_node->list); | |
daf99b48 | 881 | kref_init(&nc_node->refcount); |
55db2d59 SE |
882 | ether_addr_copy(nc_node->addr, orig_node->orig); |
883 | kref_get(&orig_neigh_node->refcount); | |
884 | nc_node->orig_node = orig_neigh_node; | |
d56b1705 | 885 | |
d56b1705 MH |
886 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", |
887 | nc_node->addr, nc_node->orig_node->orig); | |
888 | ||
889 | /* Add nc_node to orig_node */ | |
da7a26af | 890 | kref_get(&nc_node->refcount); |
d56b1705 | 891 | list_add_tail_rcu(&nc_node->list, list); |
fa122fec SE |
892 | |
893 | unlock: | |
d56b1705 MH |
894 | spin_unlock_bh(lock); |
895 | ||
896 | return nc_node; | |
d56b1705 MH |
897 | } |
898 | ||
899 | /** | |
7e9a8c2c | 900 | * batadv_nc_update_nc_node() - updates stored incoming and outgoing nc node |
34473822 | 901 | * structs (best called on incoming OGMs) |
d56b1705 MH |
902 | * @bat_priv: the bat priv with all the soft interface information |
903 | * @orig_node: orig node originating the ogm packet | |
904 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
905 | * (can be equal to orig_node) | |
906 | * @ogm_packet: incoming ogm packet | |
907 | * @is_single_hop_neigh: orig_node is a single hop neighbor | |
908 | */ | |
909 | void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, | |
910 | struct batadv_orig_node *orig_node, | |
911 | struct batadv_orig_node *orig_neigh_node, | |
912 | struct batadv_ogm_packet *ogm_packet, | |
913 | int is_single_hop_neigh) | |
914 | { | |
4f248cff SE |
915 | struct batadv_nc_node *in_nc_node = NULL; |
916 | struct batadv_nc_node *out_nc_node = NULL; | |
d56b1705 MH |
917 | |
918 | /* Check if network coding is enabled */ | |
919 | if (!atomic_read(&bat_priv->network_coding)) | |
920 | goto out; | |
921 | ||
3f4841ff | 922 | /* check if orig node is network coding enabled */ |
4635469f | 923 | if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities)) |
3f4841ff ML |
924 | goto out; |
925 | ||
d56b1705 MH |
926 | /* accept ogms from 'good' neighbors and single hop neighbors */ |
927 | if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && | |
928 | !is_single_hop_neigh) | |
929 | goto out; | |
930 | ||
931 | /* Add orig_node as in_nc_node on hop */ | |
932 | in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, | |
933 | orig_neigh_node, true); | |
934 | if (!in_nc_node) | |
935 | goto out; | |
936 | ||
937 | in_nc_node->last_seen = jiffies; | |
938 | ||
939 | /* Add hop as out_nc_node on orig_node */ | |
940 | out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, | |
941 | orig_node, false); | |
942 | if (!out_nc_node) | |
943 | goto out; | |
944 | ||
945 | out_nc_node->last_seen = jiffies; | |
946 | ||
947 | out: | |
948 | if (in_nc_node) | |
27ad7545 | 949 | batadv_nc_node_put(in_nc_node); |
d56b1705 | 950 | if (out_nc_node) |
27ad7545 | 951 | batadv_nc_node_put(out_nc_node); |
d56b1705 MH |
952 | } |
953 | ||
95332477 | 954 | /** |
7e9a8c2c | 955 | * batadv_nc_get_path() - get existing nc_path or allocate a new one |
95332477 MH |
956 | * @bat_priv: the bat priv with all the soft interface information |
957 | * @hash: hash table containing the nc path | |
958 | * @src: ethernet source address - first half of the nc path search key | |
959 | * @dst: ethernet destination address - second half of the nc path search key | |
960 | * | |
62fe710f | 961 | * Return: pointer to nc_path if the path was found or created, returns NULL |
95332477 MH |
962 | * on error. |
963 | */ | |
964 | static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, | |
965 | struct batadv_hashtable *hash, | |
6b5e971a SE |
966 | u8 *src, |
967 | u8 *dst) | |
95332477 MH |
968 | { |
969 | int hash_added; | |
970 | struct batadv_nc_path *nc_path, nc_path_key; | |
971 | ||
972 | batadv_nc_hash_key_gen(&nc_path_key, src, dst); | |
973 | ||
974 | /* Search for existing nc_path */ | |
975 | nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); | |
976 | ||
977 | if (nc_path) { | |
978 | /* Set timestamp to delay removal of nc_path */ | |
979 | nc_path->last_valid = jiffies; | |
980 | return nc_path; | |
981 | } | |
982 | ||
983 | /* No existing nc_path was found; create a new */ | |
984 | nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); | |
985 | ||
986 | if (!nc_path) | |
987 | return NULL; | |
988 | ||
989 | /* Initialize nc_path */ | |
990 | INIT_LIST_HEAD(&nc_path->packet_list); | |
991 | spin_lock_init(&nc_path->packet_list_lock); | |
727e0cd5 | 992 | kref_init(&nc_path->refcount); |
95332477 | 993 | nc_path->last_valid = jiffies; |
8fdd0153 AQ |
994 | ether_addr_copy(nc_path->next_hop, dst); |
995 | ether_addr_copy(nc_path->prev_hop, src); | |
95332477 MH |
996 | |
997 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", | |
998 | nc_path->prev_hop, | |
999 | nc_path->next_hop); | |
1000 | ||
1001 | /* Add nc_path to hash table */ | |
f489eab5 | 1002 | kref_get(&nc_path->refcount); |
95332477 MH |
1003 | hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, |
1004 | batadv_nc_hash_choose, &nc_path_key, | |
1005 | &nc_path->hash_entry); | |
1006 | ||
1007 | if (hash_added < 0) { | |
1008 | kfree(nc_path); | |
1009 | return NULL; | |
1010 | } | |
1011 | ||
1012 | return nc_path; | |
1013 | } | |
1014 | ||
3c12de9a | 1015 | /** |
7e9a8c2c | 1016 | * batadv_nc_random_weight_tq() - scale the receivers TQ-value to avoid unfair |
3c12de9a MH |
1017 | * selection of a receiver with slightly lower TQ than the other |
1018 | * @tq: to be weighted tq value | |
672e7978 SE |
1019 | * |
1020 | * Return: scaled tq value | |
3c12de9a | 1021 | */ |
6b5e971a | 1022 | static u8 batadv_nc_random_weight_tq(u8 tq) |
3c12de9a | 1023 | { |
6b5e971a | 1024 | u8 rand_val, rand_tq; |
3c12de9a MH |
1025 | |
1026 | get_random_bytes(&rand_val, sizeof(rand_val)); | |
1027 | ||
1028 | /* randomize the estimated packet loss (max TQ - estimated TQ) */ | |
1029 | rand_tq = rand_val * (BATADV_TQ_MAX_VALUE - tq); | |
1030 | ||
1031 | /* normalize the randomized packet loss */ | |
1032 | rand_tq /= BATADV_TQ_MAX_VALUE; | |
1033 | ||
1034 | /* convert to (randomized) estimated tq again */ | |
1035 | return BATADV_TQ_MAX_VALUE - rand_tq; | |
1036 | } | |
1037 | ||
1038 | /** | |
7e9a8c2c | 1039 | * batadv_nc_memxor() - XOR destination with source |
3c12de9a MH |
1040 | * @dst: byte array to XOR into |
1041 | * @src: byte array to XOR from | |
1042 | * @len: length of destination array | |
1043 | */ | |
1044 | static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) | |
1045 | { | |
1046 | unsigned int i; | |
1047 | ||
1048 | for (i = 0; i < len; ++i) | |
1049 | dst[i] ^= src[i]; | |
1050 | } | |
1051 | ||
1052 | /** | |
7e9a8c2c | 1053 | * batadv_nc_code_packets() - code a received unicast_packet with an nc packet |
3c12de9a MH |
1054 | * into a coded_packet and send it |
1055 | * @bat_priv: the bat priv with all the soft interface information | |
1056 | * @skb: data skb to forward | |
1057 | * @ethhdr: pointer to the ethernet header inside the skb | |
1058 | * @nc_packet: structure containing the packet to the skb can be coded with | |
1059 | * @neigh_node: next hop to forward packet to | |
1060 | * | |
62fe710f | 1061 | * Return: true if both packets are consumed, false otherwise. |
3c12de9a MH |
1062 | */ |
1063 | static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, | |
1064 | struct sk_buff *skb, | |
1065 | struct ethhdr *ethhdr, | |
1066 | struct batadv_nc_packet *nc_packet, | |
1067 | struct batadv_neigh_node *neigh_node) | |
1068 | { | |
6b5e971a | 1069 | u8 tq_weighted_neigh, tq_weighted_coding, tq_tmp; |
3c12de9a MH |
1070 | struct sk_buff *skb_dest, *skb_src; |
1071 | struct batadv_unicast_packet *packet1; | |
1072 | struct batadv_unicast_packet *packet2; | |
1073 | struct batadv_coded_packet *coded_packet; | |
95d39278 AQ |
1074 | struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest; |
1075 | struct batadv_neigh_node *router_coding = NULL, *second_dest; | |
89652331 SW |
1076 | struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL; |
1077 | struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL; | |
95d39278 | 1078 | u8 *first_source, *second_source; |
3c12de9a MH |
1079 | __be32 packet_id1, packet_id2; |
1080 | size_t count; | |
1081 | bool res = false; | |
1082 | int coding_len; | |
1083 | int unicast_size = sizeof(*packet1); | |
1084 | int coded_size = sizeof(*coded_packet); | |
1085 | int header_add = coded_size - unicast_size; | |
1086 | ||
7351a482 SW |
1087 | /* TODO: do we need to consider the outgoing interface for |
1088 | * coded packets? | |
1089 | */ | |
1090 | router_neigh = batadv_orig_router_get(neigh_node->orig_node, | |
1091 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1092 | if (!router_neigh) |
1093 | goto out; | |
1094 | ||
89652331 SW |
1095 | router_neigh_ifinfo = batadv_neigh_ifinfo_get(router_neigh, |
1096 | BATADV_IF_DEFAULT); | |
1097 | if (!router_neigh_ifinfo) | |
1098 | goto out; | |
1099 | ||
3c12de9a | 1100 | neigh_tmp = nc_packet->neigh_node; |
7351a482 SW |
1101 | router_coding = batadv_orig_router_get(neigh_tmp->orig_node, |
1102 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1103 | if (!router_coding) |
1104 | goto out; | |
1105 | ||
89652331 SW |
1106 | router_coding_ifinfo = batadv_neigh_ifinfo_get(router_coding, |
1107 | BATADV_IF_DEFAULT); | |
1108 | if (!router_coding_ifinfo) | |
1109 | goto out; | |
1110 | ||
1111 | tq_tmp = router_neigh_ifinfo->bat_iv.tq_avg; | |
1112 | tq_weighted_neigh = batadv_nc_random_weight_tq(tq_tmp); | |
1113 | tq_tmp = router_coding_ifinfo->bat_iv.tq_avg; | |
1114 | tq_weighted_coding = batadv_nc_random_weight_tq(tq_tmp); | |
3c12de9a MH |
1115 | |
1116 | /* Select one destination for the MAC-header dst-field based on | |
1117 | * weighted TQ-values. | |
1118 | */ | |
1119 | if (tq_weighted_neigh >= tq_weighted_coding) { | |
1120 | /* Destination from nc_packet is selected for MAC-header */ | |
95d39278 | 1121 | first_dest = nc_packet->neigh_node; |
3c12de9a | 1122 | first_source = nc_packet->nc_path->prev_hop; |
95d39278 | 1123 | second_dest = neigh_node; |
3c12de9a MH |
1124 | second_source = ethhdr->h_source; |
1125 | packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1126 | packet2 = (struct batadv_unicast_packet *)skb->data; | |
1127 | packet_id1 = nc_packet->packet_id; | |
1128 | packet_id2 = batadv_skb_crc32(skb, | |
1129 | skb->data + sizeof(*packet2)); | |
1130 | } else { | |
1131 | /* Destination for skb is selected for MAC-header */ | |
95d39278 | 1132 | first_dest = neigh_node; |
3c12de9a | 1133 | first_source = ethhdr->h_source; |
95d39278 | 1134 | second_dest = nc_packet->neigh_node; |
3c12de9a MH |
1135 | second_source = nc_packet->nc_path->prev_hop; |
1136 | packet1 = (struct batadv_unicast_packet *)skb->data; | |
1137 | packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1138 | packet_id1 = batadv_skb_crc32(skb, | |
1139 | skb->data + sizeof(*packet1)); | |
1140 | packet_id2 = nc_packet->packet_id; | |
1141 | } | |
1142 | ||
1143 | /* Instead of zero padding the smallest data buffer, we | |
1144 | * code into the largest. | |
1145 | */ | |
1146 | if (skb->len <= nc_packet->skb->len) { | |
1147 | skb_dest = nc_packet->skb; | |
1148 | skb_src = skb; | |
1149 | } else { | |
1150 | skb_dest = skb; | |
1151 | skb_src = nc_packet->skb; | |
1152 | } | |
1153 | ||
1154 | /* coding_len is used when decoding the packet shorter packet */ | |
1155 | coding_len = skb_src->len - unicast_size; | |
1156 | ||
1157 | if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) | |
1158 | goto out; | |
1159 | ||
1160 | skb_push(skb_dest, header_add); | |
1161 | ||
1162 | coded_packet = (struct batadv_coded_packet *)skb_dest->data; | |
1163 | skb_reset_mac_header(skb_dest); | |
1164 | ||
a40d9b07 SW |
1165 | coded_packet->packet_type = BATADV_CODED; |
1166 | coded_packet->version = BATADV_COMPAT_VERSION; | |
1167 | coded_packet->ttl = packet1->ttl; | |
3c12de9a MH |
1168 | |
1169 | /* Info about first unicast packet */ | |
8fdd0153 AQ |
1170 | ether_addr_copy(coded_packet->first_source, first_source); |
1171 | ether_addr_copy(coded_packet->first_orig_dest, packet1->dest); | |
3c12de9a MH |
1172 | coded_packet->first_crc = packet_id1; |
1173 | coded_packet->first_ttvn = packet1->ttvn; | |
1174 | ||
1175 | /* Info about second unicast packet */ | |
95d39278 | 1176 | ether_addr_copy(coded_packet->second_dest, second_dest->addr); |
8fdd0153 AQ |
1177 | ether_addr_copy(coded_packet->second_source, second_source); |
1178 | ether_addr_copy(coded_packet->second_orig_dest, packet2->dest); | |
3c12de9a | 1179 | coded_packet->second_crc = packet_id2; |
a40d9b07 | 1180 | coded_packet->second_ttl = packet2->ttl; |
3c12de9a MH |
1181 | coded_packet->second_ttvn = packet2->ttvn; |
1182 | coded_packet->coded_len = htons(coding_len); | |
1183 | ||
1184 | /* This is where the magic happens: Code skb_src into skb_dest */ | |
1185 | batadv_nc_memxor(skb_dest->data + coded_size, | |
1186 | skb_src->data + unicast_size, coding_len); | |
1187 | ||
1188 | /* Update counters accordingly */ | |
1189 | if (BATADV_SKB_CB(skb_src)->decoded && | |
1190 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1191 | /* Both packets are recoded */ | |
1192 | count = skb_src->len + ETH_HLEN; | |
1193 | count += skb_dest->len + ETH_HLEN; | |
1194 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); | |
1195 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); | |
1196 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1197 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1198 | /* Both packets are newly coded */ | |
1199 | count = skb_src->len + ETH_HLEN; | |
1200 | count += skb_dest->len + ETH_HLEN; | |
1201 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); | |
1202 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); | |
1203 | } else if (BATADV_SKB_CB(skb_src)->decoded && | |
1204 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1205 | /* skb_src recoded and skb_dest is newly coded */ | |
1206 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1207 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1208 | skb_src->len + ETH_HLEN); | |
1209 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1210 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1211 | skb_dest->len + ETH_HLEN); | |
1212 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1213 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1214 | /* skb_src is newly coded and skb_dest is recoded */ | |
1215 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1216 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1217 | skb_src->len + ETH_HLEN); | |
1218 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1219 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1220 | skb_dest->len + ETH_HLEN); | |
1221 | } | |
1222 | ||
1223 | /* skb_src is now coded into skb_dest, so free it */ | |
bd687fe4 | 1224 | consume_skb(skb_src); |
3c12de9a MH |
1225 | |
1226 | /* avoid duplicate free of skb from nc_packet */ | |
1227 | nc_packet->skb = NULL; | |
bd687fe4 | 1228 | batadv_nc_packet_free(nc_packet, false); |
3c12de9a MH |
1229 | |
1230 | /* Send the coded packet and return true */ | |
95d39278 | 1231 | batadv_send_unicast_skb(skb_dest, first_dest); |
3c12de9a MH |
1232 | res = true; |
1233 | out: | |
1234 | if (router_neigh) | |
25bb2509 | 1235 | batadv_neigh_node_put(router_neigh); |
3c12de9a | 1236 | if (router_coding) |
25bb2509 | 1237 | batadv_neigh_node_put(router_coding); |
89652331 | 1238 | if (router_neigh_ifinfo) |
044fa3ae | 1239 | batadv_neigh_ifinfo_put(router_neigh_ifinfo); |
89652331 | 1240 | if (router_coding_ifinfo) |
044fa3ae | 1241 | batadv_neigh_ifinfo_put(router_coding_ifinfo); |
3c12de9a MH |
1242 | return res; |
1243 | } | |
1244 | ||
1245 | /** | |
7e9a8c2c | 1246 | * batadv_nc_skb_coding_possible() - true if a decoded skb is available at dst. |
3c12de9a MH |
1247 | * @skb: data skb to forward |
1248 | * @dst: destination mac address of the other skb to code with | |
1249 | * @src: source mac address of skb | |
1250 | * | |
1251 | * Whenever we network code a packet we have to check whether we received it in | |
1252 | * a network coded form. If so, we may not be able to use it for coding because | |
1253 | * some neighbors may also have received (overheard) the packet in the network | |
1254 | * coded form without being able to decode it. It is hard to know which of the | |
1255 | * neighboring nodes was able to decode the packet, therefore we can only | |
1256 | * re-code the packet if the source of the previous encoded packet is involved. | |
1257 | * Since the source encoded the packet we can be certain it has all necessary | |
1258 | * decode information. | |
1259 | * | |
62fe710f | 1260 | * Return: true if coding of a decoded packet is allowed. |
3c12de9a | 1261 | */ |
6b5e971a | 1262 | static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) |
3c12de9a MH |
1263 | { |
1264 | if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) | |
1265 | return false; | |
24820df1 | 1266 | return true; |
3c12de9a MH |
1267 | } |
1268 | ||
1269 | /** | |
7e9a8c2c | 1270 | * batadv_nc_path_search() - Find the coding path matching in_nc_node and |
3c12de9a MH |
1271 | * out_nc_node to retrieve a buffered packet that can be used for coding. |
1272 | * @bat_priv: the bat priv with all the soft interface information | |
1273 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1274 | * @out_nc_node: pointer to skb source's neighbor nc node | |
1275 | * @skb: data skb to forward | |
1276 | * @eth_dst: next hop mac address of skb | |
1277 | * | |
62fe710f | 1278 | * Return: true if coding of a decoded skb is allowed. |
3c12de9a MH |
1279 | */ |
1280 | static struct batadv_nc_packet * | |
1281 | batadv_nc_path_search(struct batadv_priv *bat_priv, | |
1282 | struct batadv_nc_node *in_nc_node, | |
1283 | struct batadv_nc_node *out_nc_node, | |
1284 | struct sk_buff *skb, | |
6b5e971a | 1285 | u8 *eth_dst) |
3c12de9a MH |
1286 | { |
1287 | struct batadv_nc_path *nc_path, nc_path_key; | |
1288 | struct batadv_nc_packet *nc_packet_out = NULL; | |
1289 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
1290 | struct batadv_hashtable *hash = bat_priv->nc.coding_hash; | |
1291 | int idx; | |
1292 | ||
1293 | if (!hash) | |
1294 | return NULL; | |
1295 | ||
1296 | /* Create almost path key */ | |
1297 | batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, | |
1298 | out_nc_node->addr); | |
1299 | idx = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1300 | ||
1301 | /* Check for coding opportunities in this nc_path */ | |
1302 | rcu_read_lock(); | |
1303 | hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { | |
1304 | if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) | |
1305 | continue; | |
1306 | ||
1307 | if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) | |
1308 | continue; | |
1309 | ||
1310 | spin_lock_bh(&nc_path->packet_list_lock); | |
1311 | if (list_empty(&nc_path->packet_list)) { | |
1312 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1313 | continue; | |
1314 | } | |
1315 | ||
1316 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
1317 | &nc_path->packet_list, list) { | |
1318 | if (!batadv_nc_skb_coding_possible(nc_packet->skb, | |
1319 | eth_dst, | |
1320 | in_nc_node->addr)) | |
1321 | continue; | |
1322 | ||
1323 | /* Coding opportunity is found! */ | |
1324 | list_del(&nc_packet->list); | |
1325 | nc_packet_out = nc_packet; | |
1326 | break; | |
1327 | } | |
1328 | ||
1329 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1330 | break; | |
1331 | } | |
1332 | rcu_read_unlock(); | |
1333 | ||
1334 | return nc_packet_out; | |
1335 | } | |
1336 | ||
1337 | /** | |
7e9a8c2c SE |
1338 | * batadv_nc_skb_src_search() - Loops through the list of neighoring nodes of |
1339 | * the skb's sender (may be equal to the originator). | |
3c12de9a MH |
1340 | * @bat_priv: the bat priv with all the soft interface information |
1341 | * @skb: data skb to forward | |
1342 | * @eth_dst: next hop mac address of skb | |
1343 | * @eth_src: source mac address of skb | |
1344 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1345 | * | |
62fe710f | 1346 | * Return: an nc packet if a suitable coding packet was found, NULL otherwise. |
3c12de9a MH |
1347 | */ |
1348 | static struct batadv_nc_packet * | |
1349 | batadv_nc_skb_src_search(struct batadv_priv *bat_priv, | |
1350 | struct sk_buff *skb, | |
6b5e971a SE |
1351 | u8 *eth_dst, |
1352 | u8 *eth_src, | |
3c12de9a MH |
1353 | struct batadv_nc_node *in_nc_node) |
1354 | { | |
1355 | struct batadv_orig_node *orig_node; | |
1356 | struct batadv_nc_node *out_nc_node; | |
1357 | struct batadv_nc_packet *nc_packet = NULL; | |
1358 | ||
1359 | orig_node = batadv_orig_hash_find(bat_priv, eth_src); | |
1360 | if (!orig_node) | |
1361 | return NULL; | |
1362 | ||
1363 | rcu_read_lock(); | |
1364 | list_for_each_entry_rcu(out_nc_node, | |
1365 | &orig_node->out_coding_list, list) { | |
1366 | /* Check if the skb is decoded and if recoding is possible */ | |
1367 | if (!batadv_nc_skb_coding_possible(skb, | |
1368 | out_nc_node->addr, eth_src)) | |
1369 | continue; | |
1370 | ||
1371 | /* Search for an opportunity in this nc_path */ | |
1372 | nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, | |
1373 | out_nc_node, skb, eth_dst); | |
1374 | if (nc_packet) | |
1375 | break; | |
1376 | } | |
1377 | rcu_read_unlock(); | |
1378 | ||
5d967310 | 1379 | batadv_orig_node_put(orig_node); |
3c12de9a MH |
1380 | return nc_packet; |
1381 | } | |
1382 | ||
612d2b4f | 1383 | /** |
7e9a8c2c | 1384 | * batadv_nc_skb_store_before_coding() - set the ethernet src and dst of the |
612d2b4f MH |
1385 | * unicast skb before it is stored for use in later decoding |
1386 | * @bat_priv: the bat priv with all the soft interface information | |
1387 | * @skb: data skb to store | |
1388 | * @eth_dst_new: new destination mac address of skb | |
1389 | */ | |
1390 | static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, | |
1391 | struct sk_buff *skb, | |
6b5e971a | 1392 | u8 *eth_dst_new) |
612d2b4f MH |
1393 | { |
1394 | struct ethhdr *ethhdr; | |
1395 | ||
1396 | /* Copy skb header to change the mac header */ | |
bad93e9d | 1397 | skb = pskb_copy_for_clone(skb, GFP_ATOMIC); |
612d2b4f MH |
1398 | if (!skb) |
1399 | return; | |
1400 | ||
1401 | /* Set the mac header as if we actually sent the packet uncoded */ | |
7ed4be95 | 1402 | ethhdr = eth_hdr(skb); |
8fdd0153 AQ |
1403 | ether_addr_copy(ethhdr->h_source, ethhdr->h_dest); |
1404 | ether_addr_copy(ethhdr->h_dest, eth_dst_new); | |
612d2b4f MH |
1405 | |
1406 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1407 | skb_push(skb, ETH_HLEN); | |
1408 | ||
1409 | /* Add the packet to the decoding packet pool */ | |
1410 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1411 | ||
1412 | /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free | |
1413 | * our ref | |
1414 | */ | |
bd687fe4 | 1415 | consume_skb(skb); |
612d2b4f MH |
1416 | } |
1417 | ||
3c12de9a | 1418 | /** |
7e9a8c2c | 1419 | * batadv_nc_skb_dst_search() - Loops through list of neighboring nodes to dst. |
3c12de9a MH |
1420 | * @skb: data skb to forward |
1421 | * @neigh_node: next hop to forward packet to | |
1422 | * @ethhdr: pointer to the ethernet header inside the skb | |
1423 | * | |
1424 | * Loops through list of neighboring nodes the next hop has a good connection to | |
1425 | * (receives OGMs with a sufficient quality). We need to find a neighbor of our | |
1426 | * next hop that potentially sent a packet which our next hop also received | |
1427 | * (overheard) and has stored for later decoding. | |
1428 | * | |
62fe710f | 1429 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
3c12de9a MH |
1430 | */ |
1431 | static bool batadv_nc_skb_dst_search(struct sk_buff *skb, | |
1432 | struct batadv_neigh_node *neigh_node, | |
1433 | struct ethhdr *ethhdr) | |
1434 | { | |
1435 | struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1436 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1437 | struct batadv_orig_node *orig_node = neigh_node->orig_node; | |
1438 | struct batadv_nc_node *nc_node; | |
1439 | struct batadv_nc_packet *nc_packet = NULL; | |
1440 | ||
1441 | rcu_read_lock(); | |
1442 | list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { | |
1443 | /* Search for coding opportunity with this in_nc_node */ | |
1444 | nc_packet = batadv_nc_skb_src_search(bat_priv, skb, | |
1445 | neigh_node->addr, | |
1446 | ethhdr->h_source, nc_node); | |
1447 | ||
1448 | /* Opportunity was found, so stop searching */ | |
1449 | if (nc_packet) | |
1450 | break; | |
1451 | } | |
1452 | rcu_read_unlock(); | |
1453 | ||
1454 | if (!nc_packet) | |
1455 | return false; | |
1456 | ||
612d2b4f MH |
1457 | /* Save packets for later decoding */ |
1458 | batadv_nc_skb_store_before_coding(bat_priv, skb, | |
1459 | neigh_node->addr); | |
1460 | batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, | |
1461 | nc_packet->neigh_node->addr); | |
1462 | ||
3c12de9a MH |
1463 | /* Code and send packets */ |
1464 | if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, | |
1465 | neigh_node)) | |
1466 | return true; | |
1467 | ||
1468 | /* out of mem ? Coding failed - we have to free the buffered packet | |
1469 | * to avoid memleaks. The skb passed as argument will be dealt with | |
1470 | * by the calling function. | |
1471 | */ | |
1472 | batadv_nc_send_packet(nc_packet); | |
1473 | return false; | |
1474 | } | |
1475 | ||
95332477 | 1476 | /** |
7e9a8c2c | 1477 | * batadv_nc_skb_add_to_path() - buffer skb for later encoding / decoding |
95332477 MH |
1478 | * @skb: skb to add to path |
1479 | * @nc_path: path to add skb to | |
1480 | * @neigh_node: next hop to forward packet to | |
1481 | * @packet_id: checksum to identify packet | |
1482 | * | |
62fe710f | 1483 | * Return: true if the packet was buffered or false in case of an error. |
95332477 MH |
1484 | */ |
1485 | static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, | |
1486 | struct batadv_nc_path *nc_path, | |
1487 | struct batadv_neigh_node *neigh_node, | |
1488 | __be32 packet_id) | |
1489 | { | |
1490 | struct batadv_nc_packet *nc_packet; | |
1491 | ||
1492 | nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); | |
1493 | if (!nc_packet) | |
1494 | return false; | |
1495 | ||
1496 | /* Initialize nc_packet */ | |
1497 | nc_packet->timestamp = jiffies; | |
1498 | nc_packet->packet_id = packet_id; | |
1499 | nc_packet->skb = skb; | |
1500 | nc_packet->neigh_node = neigh_node; | |
1501 | nc_packet->nc_path = nc_path; | |
1502 | ||
1503 | /* Add coding packet to list */ | |
1504 | spin_lock_bh(&nc_path->packet_list_lock); | |
1505 | list_add_tail(&nc_packet->list, &nc_path->packet_list); | |
1506 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1507 | ||
1508 | return true; | |
1509 | } | |
1510 | ||
1511 | /** | |
7e9a8c2c | 1512 | * batadv_nc_skb_forward() - try to code a packet or add it to the coding packet |
95332477 MH |
1513 | * buffer |
1514 | * @skb: data skb to forward | |
1515 | * @neigh_node: next hop to forward packet to | |
95332477 | 1516 | * |
62fe710f | 1517 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
95332477 MH |
1518 | */ |
1519 | bool batadv_nc_skb_forward(struct sk_buff *skb, | |
e91ecfc6 | 1520 | struct batadv_neigh_node *neigh_node) |
95332477 MH |
1521 | { |
1522 | const struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1523 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1524 | struct batadv_unicast_packet *packet; | |
1525 | struct batadv_nc_path *nc_path; | |
e91ecfc6 | 1526 | struct ethhdr *ethhdr = eth_hdr(skb); |
95332477 MH |
1527 | __be32 packet_id; |
1528 | u8 *payload; | |
1529 | ||
1530 | /* Check if network coding is enabled */ | |
1531 | if (!atomic_read(&bat_priv->network_coding)) | |
1532 | goto out; | |
1533 | ||
1534 | /* We only handle unicast packets */ | |
1535 | payload = skb_network_header(skb); | |
1536 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1537 | if (packet->packet_type != BATADV_UNICAST) |
95332477 MH |
1538 | goto out; |
1539 | ||
3c12de9a MH |
1540 | /* Try to find a coding opportunity and send the skb if one is found */ |
1541 | if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) | |
1542 | return true; | |
1543 | ||
95332477 MH |
1544 | /* Find or create a nc_path for this src-dst pair */ |
1545 | nc_path = batadv_nc_get_path(bat_priv, | |
1546 | bat_priv->nc.coding_hash, | |
1547 | ethhdr->h_source, | |
1548 | neigh_node->addr); | |
1549 | ||
1550 | if (!nc_path) | |
1551 | goto out; | |
1552 | ||
1553 | /* Add skb to nc_path */ | |
1554 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1555 | if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) | |
1556 | goto free_nc_path; | |
1557 | ||
1558 | /* Packet is consumed */ | |
1559 | return true; | |
1560 | ||
1561 | free_nc_path: | |
5fff2825 | 1562 | batadv_nc_path_put(nc_path); |
95332477 MH |
1563 | out: |
1564 | /* Packet is not consumed */ | |
1565 | return false; | |
1566 | } | |
1567 | ||
612d2b4f | 1568 | /** |
7e9a8c2c SE |
1569 | * batadv_nc_skb_store_for_decoding() - save a clone of the skb which can be |
1570 | * used when decoding coded packets | |
612d2b4f MH |
1571 | * @bat_priv: the bat priv with all the soft interface information |
1572 | * @skb: data skb to store | |
1573 | */ | |
1574 | void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, | |
1575 | struct sk_buff *skb) | |
1576 | { | |
1577 | struct batadv_unicast_packet *packet; | |
1578 | struct batadv_nc_path *nc_path; | |
7ed4be95 | 1579 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f MH |
1580 | __be32 packet_id; |
1581 | u8 *payload; | |
1582 | ||
1583 | /* Check if network coding is enabled */ | |
1584 | if (!atomic_read(&bat_priv->network_coding)) | |
1585 | goto out; | |
1586 | ||
1587 | /* Check for supported packet type */ | |
1588 | payload = skb_network_header(skb); | |
1589 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1590 | if (packet->packet_type != BATADV_UNICAST) |
612d2b4f MH |
1591 | goto out; |
1592 | ||
1593 | /* Find existing nc_path or create a new */ | |
1594 | nc_path = batadv_nc_get_path(bat_priv, | |
1595 | bat_priv->nc.decoding_hash, | |
1596 | ethhdr->h_source, | |
1597 | ethhdr->h_dest); | |
1598 | ||
1599 | if (!nc_path) | |
1600 | goto out; | |
1601 | ||
1602 | /* Clone skb and adjust skb->data to point at batman header */ | |
1603 | skb = skb_clone(skb, GFP_ATOMIC); | |
1604 | if (unlikely(!skb)) | |
1605 | goto free_nc_path; | |
1606 | ||
1607 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) | |
1608 | goto free_skb; | |
1609 | ||
1610 | if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) | |
1611 | goto free_skb; | |
1612 | ||
1613 | /* Add skb to nc_path */ | |
1614 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1615 | if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) | |
1616 | goto free_skb; | |
1617 | ||
1618 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); | |
1619 | return; | |
1620 | ||
1621 | free_skb: | |
1622 | kfree_skb(skb); | |
1623 | free_nc_path: | |
5fff2825 | 1624 | batadv_nc_path_put(nc_path); |
612d2b4f MH |
1625 | out: |
1626 | return; | |
1627 | } | |
1628 | ||
1629 | /** | |
7e9a8c2c | 1630 | * batadv_nc_skb_store_sniffed_unicast() - check if a received unicast packet |
612d2b4f MH |
1631 | * should be saved in the decoding buffer and, if so, store it there |
1632 | * @bat_priv: the bat priv with all the soft interface information | |
1633 | * @skb: unicast skb to store | |
1634 | */ | |
1635 | void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, | |
1636 | struct sk_buff *skb) | |
1637 | { | |
7ed4be95 | 1638 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f | 1639 | |
6e0895c2 | 1640 | if (batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
612d2b4f MH |
1641 | return; |
1642 | ||
1643 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1644 | skb_push(skb, ETH_HLEN); | |
1645 | ||
1646 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1647 | } | |
1648 | ||
2df5278b | 1649 | /** |
7e9a8c2c | 1650 | * batadv_nc_skb_decode_packet() - decode given skb using the decode data stored |
2df5278b | 1651 | * in nc_packet |
6e0895c2 | 1652 | * @bat_priv: the bat priv with all the soft interface information |
2df5278b MH |
1653 | * @skb: unicast skb to decode |
1654 | * @nc_packet: decode data needed to decode the skb | |
1655 | * | |
62fe710f | 1656 | * Return: pointer to decoded unicast packet if the packet was decoded or NULL |
2df5278b MH |
1657 | * in case of an error. |
1658 | */ | |
1659 | static struct batadv_unicast_packet * | |
6e0895c2 | 1660 | batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, |
2df5278b MH |
1661 | struct batadv_nc_packet *nc_packet) |
1662 | { | |
1663 | const int h_size = sizeof(struct batadv_unicast_packet); | |
1664 | const int h_diff = sizeof(struct batadv_coded_packet) - h_size; | |
1665 | struct batadv_unicast_packet *unicast_packet; | |
1666 | struct batadv_coded_packet coded_packet_tmp; | |
1667 | struct ethhdr *ethhdr, ethhdr_tmp; | |
6b5e971a | 1668 | u8 *orig_dest, ttl, ttvn; |
2df5278b | 1669 | unsigned int coding_len; |
7da19971 | 1670 | int err; |
2df5278b MH |
1671 | |
1672 | /* Save headers temporarily */ | |
1673 | memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp)); | |
1674 | memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp)); | |
1675 | ||
1676 | if (skb_cow(skb, 0) < 0) | |
1677 | return NULL; | |
1678 | ||
1679 | if (unlikely(!skb_pull_rcsum(skb, h_diff))) | |
1680 | return NULL; | |
1681 | ||
1682 | /* Data points to batman header, so set mac header 14 bytes before | |
1683 | * and network to data | |
1684 | */ | |
1685 | skb_set_mac_header(skb, -ETH_HLEN); | |
1686 | skb_reset_network_header(skb); | |
1687 | ||
1688 | /* Reconstruct original mac header */ | |
7ed4be95 | 1689 | ethhdr = eth_hdr(skb); |
abae9479 | 1690 | *ethhdr = ethhdr_tmp; |
2df5278b MH |
1691 | |
1692 | /* Select the correct unicast header information based on the location | |
1693 | * of our mac address in the coded_packet header | |
1694 | */ | |
6e0895c2 | 1695 | if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) { |
2df5278b MH |
1696 | /* If we are the second destination the packet was overheard, |
1697 | * so the Ethernet address must be copied to h_dest and | |
1698 | * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST | |
1699 | */ | |
8fdd0153 | 1700 | ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest); |
2df5278b MH |
1701 | skb->pkt_type = PACKET_HOST; |
1702 | ||
1703 | orig_dest = coded_packet_tmp.second_orig_dest; | |
1704 | ttl = coded_packet_tmp.second_ttl; | |
1705 | ttvn = coded_packet_tmp.second_ttvn; | |
1706 | } else { | |
1707 | orig_dest = coded_packet_tmp.first_orig_dest; | |
a40d9b07 | 1708 | ttl = coded_packet_tmp.ttl; |
2df5278b MH |
1709 | ttvn = coded_packet_tmp.first_ttvn; |
1710 | } | |
1711 | ||
1712 | coding_len = ntohs(coded_packet_tmp.coded_len); | |
1713 | ||
1714 | if (coding_len > skb->len) | |
1715 | return NULL; | |
1716 | ||
1717 | /* Here the magic is reversed: | |
1718 | * extract the missing packet from the received coded packet | |
1719 | */ | |
1720 | batadv_nc_memxor(skb->data + h_size, | |
1721 | nc_packet->skb->data + h_size, | |
1722 | coding_len); | |
1723 | ||
1724 | /* Resize decoded skb if decoded with larger packet */ | |
7da19971 ML |
1725 | if (nc_packet->skb->len > coding_len + h_size) { |
1726 | err = pskb_trim_rcsum(skb, coding_len + h_size); | |
1727 | if (err) | |
1728 | return NULL; | |
1729 | } | |
2df5278b MH |
1730 | |
1731 | /* Create decoded unicast packet */ | |
1732 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
a40d9b07 SW |
1733 | unicast_packet->packet_type = BATADV_UNICAST; |
1734 | unicast_packet->version = BATADV_COMPAT_VERSION; | |
1735 | unicast_packet->ttl = ttl; | |
8fdd0153 | 1736 | ether_addr_copy(unicast_packet->dest, orig_dest); |
2df5278b MH |
1737 | unicast_packet->ttvn = ttvn; |
1738 | ||
bd687fe4 | 1739 | batadv_nc_packet_free(nc_packet, false); |
2df5278b MH |
1740 | return unicast_packet; |
1741 | } | |
1742 | ||
1743 | /** | |
7e9a8c2c | 1744 | * batadv_nc_find_decoding_packet() - search through buffered decoding data to |
2df5278b MH |
1745 | * find the data needed to decode the coded packet |
1746 | * @bat_priv: the bat priv with all the soft interface information | |
1747 | * @ethhdr: pointer to the ethernet header inside the coded packet | |
1748 | * @coded: coded packet we try to find decode data for | |
1749 | * | |
62fe710f | 1750 | * Return: pointer to nc packet if the needed data was found or NULL otherwise. |
2df5278b MH |
1751 | */ |
1752 | static struct batadv_nc_packet * | |
1753 | batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, | |
1754 | struct ethhdr *ethhdr, | |
1755 | struct batadv_coded_packet *coded) | |
1756 | { | |
1757 | struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; | |
1758 | struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; | |
1759 | struct batadv_nc_path *nc_path, nc_path_key; | |
6b5e971a | 1760 | u8 *dest, *source; |
2df5278b MH |
1761 | __be32 packet_id; |
1762 | int index; | |
1763 | ||
1764 | if (!hash) | |
1765 | return NULL; | |
1766 | ||
1767 | /* Select the correct packet id based on the location of our mac-addr */ | |
1768 | dest = ethhdr->h_source; | |
6e0895c2 | 1769 | if (!batadv_is_my_mac(bat_priv, coded->second_dest)) { |
2df5278b MH |
1770 | source = coded->second_source; |
1771 | packet_id = coded->second_crc; | |
1772 | } else { | |
1773 | source = coded->first_source; | |
1774 | packet_id = coded->first_crc; | |
1775 | } | |
1776 | ||
1777 | batadv_nc_hash_key_gen(&nc_path_key, source, dest); | |
1778 | index = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1779 | ||
1780 | /* Search for matching coding path */ | |
1781 | rcu_read_lock(); | |
1782 | hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { | |
1783 | /* Find matching nc_packet */ | |
1784 | spin_lock_bh(&nc_path->packet_list_lock); | |
1785 | list_for_each_entry(tmp_nc_packet, | |
1786 | &nc_path->packet_list, list) { | |
1787 | if (packet_id == tmp_nc_packet->packet_id) { | |
1788 | list_del(&tmp_nc_packet->list); | |
1789 | ||
1790 | nc_packet = tmp_nc_packet; | |
1791 | break; | |
1792 | } | |
1793 | } | |
1794 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1795 | ||
1796 | if (nc_packet) | |
1797 | break; | |
1798 | } | |
1799 | rcu_read_unlock(); | |
1800 | ||
1801 | if (!nc_packet) | |
1802 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
1803 | "No decoding packet found for %u\n", packet_id); | |
1804 | ||
1805 | return nc_packet; | |
1806 | } | |
1807 | ||
1808 | /** | |
7e9a8c2c | 1809 | * batadv_nc_recv_coded_packet() - try to decode coded packet and enqueue the |
2df5278b MH |
1810 | * resulting unicast packet |
1811 | * @skb: incoming coded packet | |
1812 | * @recv_if: pointer to interface this packet was received on | |
672e7978 SE |
1813 | * |
1814 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1815 | * otherwise. | |
2df5278b MH |
1816 | */ |
1817 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, | |
1818 | struct batadv_hard_iface *recv_if) | |
1819 | { | |
1820 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1821 | struct batadv_unicast_packet *unicast_packet; | |
1822 | struct batadv_coded_packet *coded_packet; | |
1823 | struct batadv_nc_packet *nc_packet; | |
1824 | struct ethhdr *ethhdr; | |
1825 | int hdr_size = sizeof(*coded_packet); | |
1826 | ||
1827 | /* Check if network coding is enabled */ | |
1828 | if (!atomic_read(&bat_priv->network_coding)) | |
b91a2543 | 1829 | goto free_skb; |
2df5278b MH |
1830 | |
1831 | /* Make sure we can access (and remove) header */ | |
1832 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
b91a2543 | 1833 | goto free_skb; |
2df5278b MH |
1834 | |
1835 | coded_packet = (struct batadv_coded_packet *)skb->data; | |
7ed4be95 | 1836 | ethhdr = eth_hdr(skb); |
2df5278b MH |
1837 | |
1838 | /* Verify frame is destined for us */ | |
6e0895c2 DM |
1839 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) && |
1840 | !batadv_is_my_mac(bat_priv, coded_packet->second_dest)) | |
b91a2543 | 1841 | goto free_skb; |
2df5278b MH |
1842 | |
1843 | /* Update stat counter */ | |
6e0895c2 | 1844 | if (batadv_is_my_mac(bat_priv, coded_packet->second_dest)) |
2df5278b MH |
1845 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED); |
1846 | ||
1847 | nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr, | |
1848 | coded_packet); | |
1849 | if (!nc_packet) { | |
1850 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
b91a2543 | 1851 | goto free_skb; |
2df5278b MH |
1852 | } |
1853 | ||
1854 | /* Make skb's linear, because decoding accesses the entire buffer */ | |
1855 | if (skb_linearize(skb) < 0) | |
1856 | goto free_nc_packet; | |
1857 | ||
1858 | if (skb_linearize(nc_packet->skb) < 0) | |
1859 | goto free_nc_packet; | |
1860 | ||
1861 | /* Decode the packet */ | |
6e0895c2 | 1862 | unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet); |
2df5278b MH |
1863 | if (!unicast_packet) { |
1864 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
1865 | goto free_nc_packet; | |
1866 | } | |
1867 | ||
1868 | /* Mark packet as decoded to do correct recoding when forwarding */ | |
1869 | BATADV_SKB_CB(skb)->decoded = true; | |
1870 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE); | |
1871 | batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES, | |
1872 | skb->len + ETH_HLEN); | |
1873 | return batadv_recv_unicast_packet(skb, recv_if); | |
1874 | ||
1875 | free_nc_packet: | |
bd687fe4 | 1876 | batadv_nc_packet_free(nc_packet, true); |
b91a2543 SE |
1877 | free_skb: |
1878 | kfree_skb(skb); | |
1879 | ||
2df5278b MH |
1880 | return NET_RX_DROP; |
1881 | } | |
1882 | ||
d353d8d4 | 1883 | /** |
7e9a8c2c | 1884 | * batadv_nc_mesh_free() - clean up network coding memory |
d353d8d4 MH |
1885 | * @bat_priv: the bat priv with all the soft interface information |
1886 | */ | |
6c519bad | 1887 | void batadv_nc_mesh_free(struct batadv_priv *bat_priv) |
d353d8d4 | 1888 | { |
3f4841ff ML |
1889 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); |
1890 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
d353d8d4 | 1891 | cancel_delayed_work_sync(&bat_priv->nc.work); |
612d2b4f | 1892 | |
95332477 MH |
1893 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); |
1894 | batadv_hash_destroy(bat_priv->nc.coding_hash); | |
612d2b4f MH |
1895 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); |
1896 | batadv_hash_destroy(bat_priv->nc.decoding_hash); | |
d353d8d4 | 1897 | } |
d56b1705 | 1898 | |
dc1cbd14 | 1899 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
d56b1705 | 1900 | /** |
7e9a8c2c | 1901 | * batadv_nc_nodes_seq_print_text() - print the nc node information |
d56b1705 MH |
1902 | * @seq: seq file to print on |
1903 | * @offset: not used | |
672e7978 SE |
1904 | * |
1905 | * Return: always 0 | |
d56b1705 MH |
1906 | */ |
1907 | int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) | |
1908 | { | |
1909 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1910 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1911 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1912 | struct batadv_hard_iface *primary_if; | |
1913 | struct hlist_head *head; | |
1914 | struct batadv_orig_node *orig_node; | |
1915 | struct batadv_nc_node *nc_node; | |
1916 | int i; | |
1917 | ||
1918 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1919 | if (!primary_if) | |
1920 | goto out; | |
1921 | ||
1922 | /* Traverse list of originators */ | |
1923 | for (i = 0; i < hash->size; i++) { | |
1924 | head = &hash->table[i]; | |
1925 | ||
1926 | /* For each orig_node in this bin */ | |
1927 | rcu_read_lock(); | |
1928 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
aa27c312 ML |
1929 | /* no need to print the orig node if it does not have |
1930 | * network coding neighbors | |
1931 | */ | |
1932 | if (list_empty(&orig_node->in_coding_list) && | |
1933 | list_empty(&orig_node->out_coding_list)) | |
1934 | continue; | |
1935 | ||
d56b1705 MH |
1936 | seq_printf(seq, "Node: %pM\n", orig_node->orig); |
1937 | ||
0c814653 | 1938 | seq_puts(seq, " Ingoing: "); |
d56b1705 MH |
1939 | /* For each in_nc_node to this orig_node */ |
1940 | list_for_each_entry_rcu(nc_node, | |
1941 | &orig_node->in_coding_list, | |
1942 | list) | |
1943 | seq_printf(seq, "%pM ", | |
1944 | nc_node->addr); | |
912eeed9 | 1945 | seq_puts(seq, "\n Outgoing: "); |
d56b1705 MH |
1946 | /* For out_nc_node to this orig_node */ |
1947 | list_for_each_entry_rcu(nc_node, | |
1948 | &orig_node->out_coding_list, | |
1949 | list) | |
1950 | seq_printf(seq, "%pM ", | |
1951 | nc_node->addr); | |
0c814653 | 1952 | seq_puts(seq, "\n\n"); |
d56b1705 MH |
1953 | } |
1954 | rcu_read_unlock(); | |
1955 | } | |
1956 | ||
1957 | out: | |
1958 | if (primary_if) | |
82047ad7 | 1959 | batadv_hardif_put(primary_if); |
d56b1705 MH |
1960 | return 0; |
1961 | } | |
1962 | ||
1963 | /** | |
7e9a8c2c | 1964 | * batadv_nc_init_debugfs() - create nc folder and related files in debugfs |
d56b1705 | 1965 | * @bat_priv: the bat priv with all the soft interface information |
672e7978 SE |
1966 | * |
1967 | * Return: 0 on success or negative error number in case of failure | |
d56b1705 MH |
1968 | */ |
1969 | int batadv_nc_init_debugfs(struct batadv_priv *bat_priv) | |
1970 | { | |
1971 | struct dentry *nc_dir, *file; | |
1972 | ||
1973 | nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir); | |
1974 | if (!nc_dir) | |
1975 | goto out; | |
1976 | ||
507b37cf | 1977 | file = debugfs_create_u8("min_tq", 0644, nc_dir, &bat_priv->nc.min_tq); |
d56b1705 MH |
1978 | if (!file) |
1979 | goto out; | |
1980 | ||
507b37cf | 1981 | file = debugfs_create_u32("max_fwd_delay", 0644, nc_dir, |
95332477 MH |
1982 | &bat_priv->nc.max_fwd_delay); |
1983 | if (!file) | |
1984 | goto out; | |
1985 | ||
507b37cf | 1986 | file = debugfs_create_u32("max_buffer_time", 0644, nc_dir, |
612d2b4f MH |
1987 | &bat_priv->nc.max_buffer_time); |
1988 | if (!file) | |
1989 | goto out; | |
1990 | ||
d56b1705 MH |
1991 | return 0; |
1992 | ||
1993 | out: | |
1994 | return -ENOMEM; | |
1995 | } | |
dc1cbd14 | 1996 | #endif |