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7db7d9f3 | 1 | // SPDX-License-Identifier: GPL-2.0 |
68e039f9 | 2 | /* Copyright (C) 2012-2020 B.A.T.M.A.N. contributors: |
d353d8d4 MH |
3 | * |
4 | * Martin Hundebøll, Jeppe Ledet-Pedersen | |
d353d8d4 MH |
5 | */ |
6 | ||
1e2c2a4f SE |
7 | #include "network-coding.h" |
8 | #include "main.h" | |
9 | ||
10 | #include <linux/atomic.h> | |
4635469f | 11 | #include <linux/bitops.h> |
1e2c2a4f SE |
12 | #include <linux/byteorder/generic.h> |
13 | #include <linux/compiler.h> | |
d56b1705 | 14 | #include <linux/debugfs.h> |
1e2c2a4f SE |
15 | #include <linux/errno.h> |
16 | #include <linux/etherdevice.h> | |
b92b94ac | 17 | #include <linux/gfp.h> |
1e2c2a4f SE |
18 | #include <linux/if_ether.h> |
19 | #include <linux/if_packet.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/jhash.h> | |
22 | #include <linux/jiffies.h> | |
23 | #include <linux/kernel.h> | |
daf99b48 | 24 | #include <linux/kref.h> |
1e2c2a4f SE |
25 | #include <linux/list.h> |
26 | #include <linux/lockdep.h> | |
3a64469e | 27 | #include <linux/net.h> |
1e2c2a4f SE |
28 | #include <linux/netdevice.h> |
29 | #include <linux/printk.h> | |
30 | #include <linux/random.h> | |
31 | #include <linux/rculist.h> | |
32 | #include <linux/rcupdate.h> | |
33 | #include <linux/seq_file.h> | |
34 | #include <linux/skbuff.h> | |
35 | #include <linux/slab.h> | |
36 | #include <linux/spinlock.h> | |
1e2c2a4f SE |
37 | #include <linux/stddef.h> |
38 | #include <linux/string.h> | |
39 | #include <linux/workqueue.h> | |
fec149f5 | 40 | #include <uapi/linux/batadv_packet.h> |
d56b1705 | 41 | |
1e2c2a4f | 42 | #include "hard-interface.h" |
95332477 | 43 | #include "hash.h" |
ba412080 | 44 | #include "log.h" |
d56b1705 | 45 | #include "originator.h" |
2df5278b | 46 | #include "routing.h" |
1e2c2a4f | 47 | #include "send.h" |
1f8dce49 | 48 | #include "tvlv.h" |
d353d8d4 | 49 | |
95332477 | 50 | static struct lock_class_key batadv_nc_coding_hash_lock_class_key; |
612d2b4f | 51 | static struct lock_class_key batadv_nc_decoding_hash_lock_class_key; |
95332477 | 52 | |
d353d8d4 | 53 | static void batadv_nc_worker(struct work_struct *work); |
2df5278b MH |
54 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, |
55 | struct batadv_hard_iface *recv_if); | |
d353d8d4 | 56 | |
6c519bad | 57 | /** |
7e9a8c2c | 58 | * batadv_nc_init() - one-time initialization for network coding |
672e7978 SE |
59 | * |
60 | * Return: 0 on success or negative error number in case of failure | |
6c519bad MS |
61 | */ |
62 | int __init batadv_nc_init(void) | |
63 | { | |
64 | int ret; | |
65 | ||
66 | /* Register our packet type */ | |
67 | ret = batadv_recv_handler_register(BATADV_CODED, | |
68 | batadv_nc_recv_coded_packet); | |
69 | ||
70 | return ret; | |
71 | } | |
72 | ||
d353d8d4 | 73 | /** |
7e9a8c2c | 74 | * batadv_nc_start_timer() - initialise the nc periodic worker |
d353d8d4 MH |
75 | * @bat_priv: the bat priv with all the soft interface information |
76 | */ | |
77 | static void batadv_nc_start_timer(struct batadv_priv *bat_priv) | |
78 | { | |
79 | queue_delayed_work(batadv_event_workqueue, &bat_priv->nc.work, | |
80 | msecs_to_jiffies(10)); | |
81 | } | |
82 | ||
3f4841ff | 83 | /** |
7e9a8c2c | 84 | * batadv_nc_tvlv_container_update() - update the network coding tvlv container |
3f4841ff ML |
85 | * after network coding setting change |
86 | * @bat_priv: the bat priv with all the soft interface information | |
87 | */ | |
88 | static void batadv_nc_tvlv_container_update(struct batadv_priv *bat_priv) | |
89 | { | |
90 | char nc_mode; | |
91 | ||
92 | nc_mode = atomic_read(&bat_priv->network_coding); | |
93 | ||
94 | switch (nc_mode) { | |
95 | case 0: | |
96 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
97 | break; | |
98 | case 1: | |
99 | batadv_tvlv_container_register(bat_priv, BATADV_TVLV_NC, 1, | |
100 | NULL, 0); | |
101 | break; | |
102 | } | |
103 | } | |
104 | ||
105 | /** | |
7e9a8c2c | 106 | * batadv_nc_status_update() - update the network coding tvlv container after |
3f4841ff ML |
107 | * network coding setting change |
108 | * @net_dev: the soft interface net device | |
109 | */ | |
110 | void batadv_nc_status_update(struct net_device *net_dev) | |
111 | { | |
112 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
f138694b | 113 | |
3f4841ff ML |
114 | batadv_nc_tvlv_container_update(bat_priv); |
115 | } | |
116 | ||
117 | /** | |
7e9a8c2c | 118 | * batadv_nc_tvlv_ogm_handler_v1() - process incoming nc tvlv container |
3f4841ff ML |
119 | * @bat_priv: the bat priv with all the soft interface information |
120 | * @orig: the orig_node of the ogm | |
121 | * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags) | |
122 | * @tvlv_value: tvlv buffer containing the gateway data | |
123 | * @tvlv_value_len: tvlv buffer length | |
124 | */ | |
125 | static void batadv_nc_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv, | |
126 | struct batadv_orig_node *orig, | |
6b5e971a SE |
127 | u8 flags, |
128 | void *tvlv_value, u16 tvlv_value_len) | |
3f4841ff ML |
129 | { |
130 | if (flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) | |
4635469f | 131 | clear_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); |
3f4841ff | 132 | else |
4635469f | 133 | set_bit(BATADV_ORIG_CAPA_HAS_NC, &orig->capabilities); |
3f4841ff ML |
134 | } |
135 | ||
d353d8d4 | 136 | /** |
7e9a8c2c | 137 | * batadv_nc_mesh_init() - initialise coding hash table and start house keeping |
d353d8d4 | 138 | * @bat_priv: the bat priv with all the soft interface information |
672e7978 SE |
139 | * |
140 | * Return: 0 on success or negative error number in case of failure | |
d353d8d4 | 141 | */ |
6c519bad | 142 | int batadv_nc_mesh_init(struct batadv_priv *bat_priv) |
d353d8d4 | 143 | { |
95332477 | 144 | bat_priv->nc.timestamp_fwd_flush = jiffies; |
612d2b4f | 145 | bat_priv->nc.timestamp_sniffed_purge = jiffies; |
95332477 | 146 | |
612d2b4f | 147 | if (bat_priv->nc.coding_hash || bat_priv->nc.decoding_hash) |
95332477 MH |
148 | return 0; |
149 | ||
150 | bat_priv->nc.coding_hash = batadv_hash_new(128); | |
151 | if (!bat_priv->nc.coding_hash) | |
152 | goto err; | |
153 | ||
154 | batadv_hash_set_lock_class(bat_priv->nc.coding_hash, | |
155 | &batadv_nc_coding_hash_lock_class_key); | |
156 | ||
612d2b4f MH |
157 | bat_priv->nc.decoding_hash = batadv_hash_new(128); |
158 | if (!bat_priv->nc.decoding_hash) | |
159 | goto err; | |
160 | ||
f44d5407 | 161 | batadv_hash_set_lock_class(bat_priv->nc.decoding_hash, |
612d2b4f MH |
162 | &batadv_nc_decoding_hash_lock_class_key); |
163 | ||
d353d8d4 MH |
164 | INIT_DELAYED_WORK(&bat_priv->nc.work, batadv_nc_worker); |
165 | batadv_nc_start_timer(bat_priv); | |
166 | ||
3f4841ff ML |
167 | batadv_tvlv_handler_register(bat_priv, batadv_nc_tvlv_ogm_handler_v1, |
168 | NULL, BATADV_TVLV_NC, 1, | |
169 | BATADV_TVLV_HANDLER_OGM_CIFNOTFND); | |
170 | batadv_nc_tvlv_container_update(bat_priv); | |
d353d8d4 | 171 | return 0; |
95332477 MH |
172 | |
173 | err: | |
174 | return -ENOMEM; | |
d353d8d4 MH |
175 | } |
176 | ||
177 | /** | |
7e9a8c2c | 178 | * batadv_nc_init_bat_priv() - initialise the nc specific bat_priv variables |
d353d8d4 MH |
179 | * @bat_priv: the bat priv with all the soft interface information |
180 | */ | |
181 | void batadv_nc_init_bat_priv(struct batadv_priv *bat_priv) | |
182 | { | |
dab7b621 | 183 | atomic_set(&bat_priv->network_coding, 0); |
d56b1705 | 184 | bat_priv->nc.min_tq = 200; |
95332477 | 185 | bat_priv->nc.max_fwd_delay = 10; |
612d2b4f | 186 | bat_priv->nc.max_buffer_time = 200; |
d56b1705 MH |
187 | } |
188 | ||
189 | /** | |
7e9a8c2c | 190 | * batadv_nc_init_orig() - initialise the nc fields of an orig_node |
d56b1705 MH |
191 | * @orig_node: the orig_node which is going to be initialised |
192 | */ | |
193 | void batadv_nc_init_orig(struct batadv_orig_node *orig_node) | |
194 | { | |
195 | INIT_LIST_HEAD(&orig_node->in_coding_list); | |
196 | INIT_LIST_HEAD(&orig_node->out_coding_list); | |
197 | spin_lock_init(&orig_node->in_coding_list_lock); | |
198 | spin_lock_init(&orig_node->out_coding_list_lock); | |
199 | } | |
200 | ||
201 | /** | |
7e9a8c2c SE |
202 | * batadv_nc_node_release() - release nc_node from lists and queue for free |
203 | * after rcu grace period | |
daf99b48 | 204 | * @ref: kref pointer of the nc_node |
d56b1705 | 205 | */ |
daf99b48 | 206 | static void batadv_nc_node_release(struct kref *ref) |
d56b1705 | 207 | { |
daf99b48 SE |
208 | struct batadv_nc_node *nc_node; |
209 | ||
210 | nc_node = container_of(ref, struct batadv_nc_node, refcount); | |
211 | ||
5d967310 | 212 | batadv_orig_node_put(nc_node->orig_node); |
44e8e7e9 | 213 | kfree_rcu(nc_node, rcu); |
d56b1705 MH |
214 | } |
215 | ||
216 | /** | |
7e9a8c2c | 217 | * batadv_nc_node_put() - decrement the nc_node refcounter and possibly |
44e8e7e9 | 218 | * release it |
daf99b48 | 219 | * @nc_node: nc_node to be free'd |
d56b1705 | 220 | */ |
27ad7545 | 221 | static void batadv_nc_node_put(struct batadv_nc_node *nc_node) |
d56b1705 | 222 | { |
daf99b48 | 223 | kref_put(&nc_node->refcount, batadv_nc_node_release); |
d56b1705 MH |
224 | } |
225 | ||
95332477 | 226 | /** |
7e9a8c2c SE |
227 | * batadv_nc_path_release() - release nc_path from lists and queue for free |
228 | * after rcu grace period | |
727e0cd5 SE |
229 | * @ref: kref pointer of the nc_path |
230 | */ | |
231 | static void batadv_nc_path_release(struct kref *ref) | |
232 | { | |
233 | struct batadv_nc_path *nc_path; | |
234 | ||
235 | nc_path = container_of(ref, struct batadv_nc_path, refcount); | |
236 | ||
237 | kfree_rcu(nc_path, rcu); | |
238 | } | |
239 | ||
240 | /** | |
7e9a8c2c | 241 | * batadv_nc_path_put() - decrement the nc_path refcounter and possibly |
727e0cd5 SE |
242 | * release it |
243 | * @nc_path: nc_path to be free'd | |
95332477 | 244 | */ |
5fff2825 | 245 | static void batadv_nc_path_put(struct batadv_nc_path *nc_path) |
95332477 | 246 | { |
727e0cd5 | 247 | kref_put(&nc_path->refcount, batadv_nc_path_release); |
95332477 MH |
248 | } |
249 | ||
250 | /** | |
7e9a8c2c | 251 | * batadv_nc_packet_free() - frees nc packet |
95332477 | 252 | * @nc_packet: the nc packet to free |
bd687fe4 | 253 | * @dropped: whether the packet is freed because is is dropped |
95332477 | 254 | */ |
bd687fe4 SE |
255 | static void batadv_nc_packet_free(struct batadv_nc_packet *nc_packet, |
256 | bool dropped) | |
95332477 | 257 | { |
bd687fe4 SE |
258 | if (dropped) |
259 | kfree_skb(nc_packet->skb); | |
260 | else | |
261 | consume_skb(nc_packet->skb); | |
262 | ||
5fff2825 | 263 | batadv_nc_path_put(nc_packet->nc_path); |
95332477 MH |
264 | kfree(nc_packet); |
265 | } | |
266 | ||
d56b1705 | 267 | /** |
7e9a8c2c | 268 | * batadv_nc_to_purge_nc_node() - checks whether an nc node has to be purged |
d56b1705 MH |
269 | * @bat_priv: the bat priv with all the soft interface information |
270 | * @nc_node: the nc node to check | |
271 | * | |
62fe710f | 272 | * Return: true if the entry has to be purged now, false otherwise |
d56b1705 MH |
273 | */ |
274 | static bool batadv_nc_to_purge_nc_node(struct batadv_priv *bat_priv, | |
275 | struct batadv_nc_node *nc_node) | |
276 | { | |
277 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
278 | return true; | |
279 | ||
280 | return batadv_has_timed_out(nc_node->last_seen, BATADV_NC_NODE_TIMEOUT); | |
281 | } | |
282 | ||
95332477 | 283 | /** |
7e9a8c2c | 284 | * batadv_nc_to_purge_nc_path_coding() - checks whether an nc path has timed out |
95332477 MH |
285 | * @bat_priv: the bat priv with all the soft interface information |
286 | * @nc_path: the nc path to check | |
287 | * | |
62fe710f | 288 | * Return: true if the entry has to be purged now, false otherwise |
95332477 MH |
289 | */ |
290 | static bool batadv_nc_to_purge_nc_path_coding(struct batadv_priv *bat_priv, | |
291 | struct batadv_nc_path *nc_path) | |
292 | { | |
293 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
294 | return true; | |
295 | ||
296 | /* purge the path when no packets has been added for 10 times the | |
297 | * max_fwd_delay time | |
298 | */ | |
299 | return batadv_has_timed_out(nc_path->last_valid, | |
300 | bat_priv->nc.max_fwd_delay * 10); | |
301 | } | |
302 | ||
612d2b4f | 303 | /** |
7e9a8c2c SE |
304 | * batadv_nc_to_purge_nc_path_decoding() - checks whether an nc path has timed |
305 | * out | |
612d2b4f MH |
306 | * @bat_priv: the bat priv with all the soft interface information |
307 | * @nc_path: the nc path to check | |
308 | * | |
62fe710f | 309 | * Return: true if the entry has to be purged now, false otherwise |
612d2b4f MH |
310 | */ |
311 | static bool batadv_nc_to_purge_nc_path_decoding(struct batadv_priv *bat_priv, | |
312 | struct batadv_nc_path *nc_path) | |
313 | { | |
314 | if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE) | |
315 | return true; | |
316 | ||
317 | /* purge the path when no packets has been added for 10 times the | |
318 | * max_buffer time | |
319 | */ | |
320 | return batadv_has_timed_out(nc_path->last_valid, | |
fc1f8693 | 321 | bat_priv->nc.max_buffer_time * 10); |
612d2b4f MH |
322 | } |
323 | ||
d56b1705 | 324 | /** |
7e9a8c2c | 325 | * batadv_nc_purge_orig_nc_nodes() - go through list of nc nodes and purge stale |
d56b1705 MH |
326 | * entries |
327 | * @bat_priv: the bat priv with all the soft interface information | |
328 | * @list: list of nc nodes | |
329 | * @lock: nc node list lock | |
330 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
331 | * not. This function takes the nc node as argument and has to return | |
332 | * a boolean value: true if the entry has to be deleted, false | |
333 | * otherwise | |
334 | */ | |
335 | static void | |
336 | batadv_nc_purge_orig_nc_nodes(struct batadv_priv *bat_priv, | |
337 | struct list_head *list, | |
338 | spinlock_t *lock, | |
339 | bool (*to_purge)(struct batadv_priv *, | |
340 | struct batadv_nc_node *)) | |
341 | { | |
342 | struct batadv_nc_node *nc_node, *nc_node_tmp; | |
343 | ||
344 | /* For each nc_node in list */ | |
345 | spin_lock_bh(lock); | |
346 | list_for_each_entry_safe(nc_node, nc_node_tmp, list, list) { | |
347 | /* if an helper function has been passed as parameter, | |
348 | * ask it if the entry has to be purged or not | |
349 | */ | |
350 | if (to_purge && !to_purge(bat_priv, nc_node)) | |
351 | continue; | |
352 | ||
353 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
354 | "Removing nc_node %pM -> %pM\n", | |
355 | nc_node->addr, nc_node->orig_node->orig); | |
356 | list_del_rcu(&nc_node->list); | |
27ad7545 | 357 | batadv_nc_node_put(nc_node); |
d56b1705 MH |
358 | } |
359 | spin_unlock_bh(lock); | |
360 | } | |
361 | ||
362 | /** | |
7e9a8c2c | 363 | * batadv_nc_purge_orig() - purges all nc node data attached of the given |
d56b1705 MH |
364 | * originator |
365 | * @bat_priv: the bat priv with all the soft interface information | |
366 | * @orig_node: orig_node with the nc node entries to be purged | |
367 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
368 | * not. This function takes the nc node as argument and has to return | |
369 | * a boolean value: true is the entry has to be deleted, false | |
370 | * otherwise | |
371 | */ | |
372 | void batadv_nc_purge_orig(struct batadv_priv *bat_priv, | |
373 | struct batadv_orig_node *orig_node, | |
374 | bool (*to_purge)(struct batadv_priv *, | |
375 | struct batadv_nc_node *)) | |
376 | { | |
377 | /* Check ingoing nc_node's of this orig_node */ | |
378 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->in_coding_list, | |
379 | &orig_node->in_coding_list_lock, | |
380 | to_purge); | |
381 | ||
382 | /* Check outgoing nc_node's of this orig_node */ | |
383 | batadv_nc_purge_orig_nc_nodes(bat_priv, &orig_node->out_coding_list, | |
384 | &orig_node->out_coding_list_lock, | |
385 | to_purge); | |
386 | } | |
387 | ||
388 | /** | |
7e9a8c2c SE |
389 | * batadv_nc_purge_orig_hash() - traverse entire originator hash to check if |
390 | * they have timed out nc nodes | |
d56b1705 MH |
391 | * @bat_priv: the bat priv with all the soft interface information |
392 | */ | |
393 | static void batadv_nc_purge_orig_hash(struct batadv_priv *bat_priv) | |
394 | { | |
395 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
396 | struct hlist_head *head; | |
397 | struct batadv_orig_node *orig_node; | |
6b5e971a | 398 | u32 i; |
d56b1705 MH |
399 | |
400 | if (!hash) | |
401 | return; | |
402 | ||
403 | /* For each orig_node */ | |
404 | for (i = 0; i < hash->size; i++) { | |
405 | head = &hash->table[i]; | |
406 | ||
407 | rcu_read_lock(); | |
408 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) | |
409 | batadv_nc_purge_orig(bat_priv, orig_node, | |
410 | batadv_nc_to_purge_nc_node); | |
411 | rcu_read_unlock(); | |
412 | } | |
d353d8d4 MH |
413 | } |
414 | ||
95332477 | 415 | /** |
7e9a8c2c | 416 | * batadv_nc_purge_paths() - traverse all nc paths part of the hash and remove |
95332477 MH |
417 | * unused ones |
418 | * @bat_priv: the bat priv with all the soft interface information | |
419 | * @hash: hash table containing the nc paths to check | |
420 | * @to_purge: function in charge to decide whether an entry has to be purged or | |
421 | * not. This function takes the nc node as argument and has to return | |
422 | * a boolean value: true is the entry has to be deleted, false | |
423 | * otherwise | |
424 | */ | |
425 | static void batadv_nc_purge_paths(struct batadv_priv *bat_priv, | |
426 | struct batadv_hashtable *hash, | |
427 | bool (*to_purge)(struct batadv_priv *, | |
428 | struct batadv_nc_path *)) | |
429 | { | |
430 | struct hlist_head *head; | |
431 | struct hlist_node *node_tmp; | |
432 | struct batadv_nc_path *nc_path; | |
433 | spinlock_t *lock; /* Protects lists in hash */ | |
6b5e971a | 434 | u32 i; |
95332477 MH |
435 | |
436 | for (i = 0; i < hash->size; i++) { | |
437 | head = &hash->table[i]; | |
438 | lock = &hash->list_locks[i]; | |
439 | ||
440 | /* For each nc_path in this bin */ | |
441 | spin_lock_bh(lock); | |
442 | hlist_for_each_entry_safe(nc_path, node_tmp, head, hash_entry) { | |
443 | /* if an helper function has been passed as parameter, | |
444 | * ask it if the entry has to be purged or not | |
445 | */ | |
446 | if (to_purge && !to_purge(bat_priv, nc_path)) | |
447 | continue; | |
448 | ||
449 | /* purging an non-empty nc_path should never happen, but | |
450 | * is observed under high CPU load. Delay the purging | |
451 | * until next iteration to allow the packet_list to be | |
452 | * emptied first. | |
453 | */ | |
454 | if (!unlikely(list_empty(&nc_path->packet_list))) { | |
455 | net_ratelimited_function(printk, | |
456 | KERN_WARNING | |
457 | "Skipping free of non-empty nc_path (%pM -> %pM)!\n", | |
458 | nc_path->prev_hop, | |
459 | nc_path->next_hop); | |
460 | continue; | |
461 | } | |
462 | ||
463 | /* nc_path is unused, so remove it */ | |
464 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
465 | "Remove nc_path %pM -> %pM\n", | |
466 | nc_path->prev_hop, nc_path->next_hop); | |
467 | hlist_del_rcu(&nc_path->hash_entry); | |
5fff2825 | 468 | batadv_nc_path_put(nc_path); |
95332477 MH |
469 | } |
470 | spin_unlock_bh(lock); | |
471 | } | |
472 | } | |
473 | ||
474 | /** | |
7e9a8c2c | 475 | * batadv_nc_hash_key_gen() - computes the nc_path hash key |
95332477 MH |
476 | * @key: buffer to hold the final hash key |
477 | * @src: source ethernet mac address going into the hash key | |
478 | * @dst: destination ethernet mac address going into the hash key | |
479 | */ | |
480 | static void batadv_nc_hash_key_gen(struct batadv_nc_path *key, const char *src, | |
481 | const char *dst) | |
482 | { | |
483 | memcpy(key->prev_hop, src, sizeof(key->prev_hop)); | |
484 | memcpy(key->next_hop, dst, sizeof(key->next_hop)); | |
485 | } | |
486 | ||
487 | /** | |
7e9a8c2c | 488 | * batadv_nc_hash_choose() - compute the hash value for an nc path |
95332477 MH |
489 | * @data: data to hash |
490 | * @size: size of the hash table | |
491 | * | |
62fe710f | 492 | * Return: the selected index in the hash table for the given data. |
95332477 | 493 | */ |
6b5e971a | 494 | static u32 batadv_nc_hash_choose(const void *data, u32 size) |
95332477 MH |
495 | { |
496 | const struct batadv_nc_path *nc_path = data; | |
6b5e971a | 497 | u32 hash = 0; |
95332477 | 498 | |
36fd61cb SE |
499 | hash = jhash(&nc_path->prev_hop, sizeof(nc_path->prev_hop), hash); |
500 | hash = jhash(&nc_path->next_hop, sizeof(nc_path->next_hop), hash); | |
95332477 MH |
501 | |
502 | return hash % size; | |
503 | } | |
504 | ||
505 | /** | |
7e9a8c2c | 506 | * batadv_nc_hash_compare() - comparing function used in the network coding hash |
95332477 MH |
507 | * tables |
508 | * @node: node in the local table | |
509 | * @data2: second object to compare the node to | |
510 | * | |
4b426b10 | 511 | * Return: true if the two entry are the same, false otherwise |
95332477 | 512 | */ |
4b426b10 SE |
513 | static bool batadv_nc_hash_compare(const struct hlist_node *node, |
514 | const void *data2) | |
95332477 MH |
515 | { |
516 | const struct batadv_nc_path *nc_path1, *nc_path2; | |
517 | ||
518 | nc_path1 = container_of(node, struct batadv_nc_path, hash_entry); | |
519 | nc_path2 = data2; | |
520 | ||
521 | /* Return 1 if the two keys are identical */ | |
676970e5 | 522 | if (!batadv_compare_eth(nc_path1->prev_hop, nc_path2->prev_hop)) |
4b426b10 | 523 | return false; |
95332477 | 524 | |
676970e5 | 525 | if (!batadv_compare_eth(nc_path1->next_hop, nc_path2->next_hop)) |
4b426b10 | 526 | return false; |
95332477 | 527 | |
4b426b10 | 528 | return true; |
95332477 MH |
529 | } |
530 | ||
531 | /** | |
7e9a8c2c | 532 | * batadv_nc_hash_find() - search for an existing nc path and return it |
95332477 MH |
533 | * @hash: hash table containing the nc path |
534 | * @data: search key | |
535 | * | |
62fe710f | 536 | * Return: the nc_path if found, NULL otherwise. |
95332477 MH |
537 | */ |
538 | static struct batadv_nc_path * | |
539 | batadv_nc_hash_find(struct batadv_hashtable *hash, | |
540 | void *data) | |
541 | { | |
542 | struct hlist_head *head; | |
543 | struct batadv_nc_path *nc_path, *nc_path_tmp = NULL; | |
544 | int index; | |
545 | ||
546 | if (!hash) | |
547 | return NULL; | |
548 | ||
549 | index = batadv_nc_hash_choose(data, hash->size); | |
550 | head = &hash->table[index]; | |
551 | ||
552 | rcu_read_lock(); | |
553 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
554 | if (!batadv_nc_hash_compare(&nc_path->hash_entry, data)) | |
555 | continue; | |
556 | ||
727e0cd5 | 557 | if (!kref_get_unless_zero(&nc_path->refcount)) |
95332477 MH |
558 | continue; |
559 | ||
560 | nc_path_tmp = nc_path; | |
561 | break; | |
562 | } | |
563 | rcu_read_unlock(); | |
564 | ||
565 | return nc_path_tmp; | |
566 | } | |
567 | ||
568 | /** | |
7e9a8c2c | 569 | * batadv_nc_send_packet() - send non-coded packet and free nc_packet struct |
95332477 MH |
570 | * @nc_packet: the nc packet to send |
571 | */ | |
572 | static void batadv_nc_send_packet(struct batadv_nc_packet *nc_packet) | |
573 | { | |
95d39278 | 574 | batadv_send_unicast_skb(nc_packet->skb, nc_packet->neigh_node); |
95332477 | 575 | nc_packet->skb = NULL; |
bd687fe4 | 576 | batadv_nc_packet_free(nc_packet, false); |
95332477 MH |
577 | } |
578 | ||
612d2b4f | 579 | /** |
7e9a8c2c | 580 | * batadv_nc_sniffed_purge() - Checks timestamp of given sniffed nc_packet. |
612d2b4f MH |
581 | * @bat_priv: the bat priv with all the soft interface information |
582 | * @nc_path: the nc path the packet belongs to | |
583 | * @nc_packet: the nc packet to be checked | |
584 | * | |
585 | * Checks whether the given sniffed (overheard) nc_packet has hit its buffering | |
586 | * timeout. If so, the packet is no longer kept and the entry deleted from the | |
587 | * queue. Has to be called with the appropriate locks. | |
588 | * | |
62fe710f | 589 | * Return: false as soon as the entry in the fifo queue has not been timed out |
612d2b4f MH |
590 | * yet and true otherwise. |
591 | */ | |
592 | static bool batadv_nc_sniffed_purge(struct batadv_priv *bat_priv, | |
593 | struct batadv_nc_path *nc_path, | |
594 | struct batadv_nc_packet *nc_packet) | |
595 | { | |
596 | unsigned long timeout = bat_priv->nc.max_buffer_time; | |
597 | bool res = false; | |
598 | ||
2c72d655 SE |
599 | lockdep_assert_held(&nc_path->packet_list_lock); |
600 | ||
612d2b4f MH |
601 | /* Packets are added to tail, so the remaining packets did not time |
602 | * out and we can stop processing the current queue | |
603 | */ | |
604 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
605 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
606 | goto out; | |
607 | ||
608 | /* purge nc packet */ | |
609 | list_del(&nc_packet->list); | |
bd687fe4 | 610 | batadv_nc_packet_free(nc_packet, true); |
612d2b4f MH |
611 | |
612 | res = true; | |
613 | ||
614 | out: | |
615 | return res; | |
616 | } | |
617 | ||
95332477 | 618 | /** |
7e9a8c2c | 619 | * batadv_nc_fwd_flush() - Checks the timestamp of the given nc packet. |
95332477 MH |
620 | * @bat_priv: the bat priv with all the soft interface information |
621 | * @nc_path: the nc path the packet belongs to | |
622 | * @nc_packet: the nc packet to be checked | |
623 | * | |
624 | * Checks whether the given nc packet has hit its forward timeout. If so, the | |
625 | * packet is no longer delayed, immediately sent and the entry deleted from the | |
626 | * queue. Has to be called with the appropriate locks. | |
627 | * | |
62fe710f | 628 | * Return: false as soon as the entry in the fifo queue has not been timed out |
95332477 MH |
629 | * yet and true otherwise. |
630 | */ | |
631 | static bool batadv_nc_fwd_flush(struct batadv_priv *bat_priv, | |
632 | struct batadv_nc_path *nc_path, | |
633 | struct batadv_nc_packet *nc_packet) | |
634 | { | |
635 | unsigned long timeout = bat_priv->nc.max_fwd_delay; | |
636 | ||
2c72d655 SE |
637 | lockdep_assert_held(&nc_path->packet_list_lock); |
638 | ||
95332477 MH |
639 | /* Packets are added to tail, so the remaining packets did not time |
640 | * out and we can stop processing the current queue | |
641 | */ | |
642 | if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_ACTIVE && | |
643 | !batadv_has_timed_out(nc_packet->timestamp, timeout)) | |
644 | return false; | |
645 | ||
646 | /* Send packet */ | |
647 | batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD); | |
648 | batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES, | |
649 | nc_packet->skb->len + ETH_HLEN); | |
650 | list_del(&nc_packet->list); | |
651 | batadv_nc_send_packet(nc_packet); | |
652 | ||
653 | return true; | |
654 | } | |
655 | ||
656 | /** | |
7e9a8c2c SE |
657 | * batadv_nc_process_nc_paths() - traverse given nc packet pool and free timed |
658 | * out nc packets | |
95332477 MH |
659 | * @bat_priv: the bat priv with all the soft interface information |
660 | * @hash: to be processed hash table | |
661 | * @process_fn: Function called to process given nc packet. Should return true | |
662 | * to encourage this function to proceed with the next packet. | |
663 | * Otherwise the rest of the current queue is skipped. | |
664 | */ | |
665 | static void | |
666 | batadv_nc_process_nc_paths(struct batadv_priv *bat_priv, | |
667 | struct batadv_hashtable *hash, | |
668 | bool (*process_fn)(struct batadv_priv *, | |
669 | struct batadv_nc_path *, | |
670 | struct batadv_nc_packet *)) | |
671 | { | |
672 | struct hlist_head *head; | |
673 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
674 | struct batadv_nc_path *nc_path; | |
675 | bool ret; | |
676 | int i; | |
677 | ||
678 | if (!hash) | |
679 | return; | |
680 | ||
681 | /* Loop hash table bins */ | |
682 | for (i = 0; i < hash->size; i++) { | |
683 | head = &hash->table[i]; | |
684 | ||
685 | /* Loop coding paths */ | |
686 | rcu_read_lock(); | |
687 | hlist_for_each_entry_rcu(nc_path, head, hash_entry) { | |
688 | /* Loop packets */ | |
689 | spin_lock_bh(&nc_path->packet_list_lock); | |
690 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
691 | &nc_path->packet_list, list) { | |
692 | ret = process_fn(bat_priv, nc_path, nc_packet); | |
693 | if (!ret) | |
694 | break; | |
695 | } | |
696 | spin_unlock_bh(&nc_path->packet_list_lock); | |
697 | } | |
698 | rcu_read_unlock(); | |
699 | } | |
700 | } | |
701 | ||
d353d8d4 | 702 | /** |
7e9a8c2c SE |
703 | * batadv_nc_worker() - periodic task for house keeping related to network |
704 | * coding | |
d353d8d4 MH |
705 | * @work: kernel work struct |
706 | */ | |
707 | static void batadv_nc_worker(struct work_struct *work) | |
708 | { | |
709 | struct delayed_work *delayed_work; | |
710 | struct batadv_priv_nc *priv_nc; | |
711 | struct batadv_priv *bat_priv; | |
95332477 | 712 | unsigned long timeout; |
d353d8d4 | 713 | |
4ba4bc0f | 714 | delayed_work = to_delayed_work(work); |
d353d8d4 MH |
715 | priv_nc = container_of(delayed_work, struct batadv_priv_nc, work); |
716 | bat_priv = container_of(priv_nc, struct batadv_priv, nc); | |
717 | ||
d56b1705 | 718 | batadv_nc_purge_orig_hash(bat_priv); |
95332477 MH |
719 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, |
720 | batadv_nc_to_purge_nc_path_coding); | |
612d2b4f MH |
721 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, |
722 | batadv_nc_to_purge_nc_path_decoding); | |
95332477 MH |
723 | |
724 | timeout = bat_priv->nc.max_fwd_delay; | |
725 | ||
726 | if (batadv_has_timed_out(bat_priv->nc.timestamp_fwd_flush, timeout)) { | |
727 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.coding_hash, | |
728 | batadv_nc_fwd_flush); | |
729 | bat_priv->nc.timestamp_fwd_flush = jiffies; | |
730 | } | |
d56b1705 | 731 | |
612d2b4f MH |
732 | if (batadv_has_timed_out(bat_priv->nc.timestamp_sniffed_purge, |
733 | bat_priv->nc.max_buffer_time)) { | |
734 | batadv_nc_process_nc_paths(bat_priv, bat_priv->nc.decoding_hash, | |
735 | batadv_nc_sniffed_purge); | |
736 | bat_priv->nc.timestamp_sniffed_purge = jiffies; | |
737 | } | |
738 | ||
d353d8d4 MH |
739 | /* Schedule a new check */ |
740 | batadv_nc_start_timer(bat_priv); | |
741 | } | |
742 | ||
d56b1705 | 743 | /** |
7e9a8c2c SE |
744 | * batadv_can_nc_with_orig() - checks whether the given orig node is suitable |
745 | * for coding or not | |
d56b1705 MH |
746 | * @bat_priv: the bat priv with all the soft interface information |
747 | * @orig_node: neighboring orig node which may be used as nc candidate | |
748 | * @ogm_packet: incoming ogm packet also used for the checks | |
749 | * | |
62fe710f | 750 | * Return: true if: |
d56b1705 MH |
751 | * 1) The OGM must have the most recent sequence number. |
752 | * 2) The TTL must be decremented by one and only one. | |
753 | * 3) The OGM must be received from the first hop from orig_node. | |
754 | * 4) The TQ value of the OGM must be above bat_priv->nc.min_tq. | |
755 | */ | |
756 | static bool batadv_can_nc_with_orig(struct batadv_priv *bat_priv, | |
757 | struct batadv_orig_node *orig_node, | |
758 | struct batadv_ogm_packet *ogm_packet) | |
759 | { | |
7351a482 | 760 | struct batadv_orig_ifinfo *orig_ifinfo; |
6b5e971a SE |
761 | u32 last_real_seqno; |
762 | u8 last_ttl; | |
7351a482 SW |
763 | |
764 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, BATADV_IF_DEFAULT); | |
765 | if (!orig_ifinfo) | |
d56b1705 | 766 | return false; |
7351a482 SW |
767 | |
768 | last_ttl = orig_ifinfo->last_ttl; | |
769 | last_real_seqno = orig_ifinfo->last_real_seqno; | |
35f94779 | 770 | batadv_orig_ifinfo_put(orig_ifinfo); |
7351a482 SW |
771 | |
772 | if (last_real_seqno != ntohl(ogm_packet->seqno)) | |
773 | return false; | |
774 | if (last_ttl != ogm_packet->ttl + 1) | |
d56b1705 MH |
775 | return false; |
776 | if (!batadv_compare_eth(ogm_packet->orig, ogm_packet->prev_sender)) | |
777 | return false; | |
778 | if (ogm_packet->tq < bat_priv->nc.min_tq) | |
779 | return false; | |
780 | ||
781 | return true; | |
782 | } | |
783 | ||
784 | /** | |
7e9a8c2c | 785 | * batadv_nc_find_nc_node() - search for an existing nc node and return it |
d56b1705 MH |
786 | * @orig_node: orig node originating the ogm packet |
787 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
788 | * (can be equal to orig_node) | |
789 | * @in_coding: traverse incoming or outgoing network coding list | |
790 | * | |
62fe710f | 791 | * Return: the nc_node if found, NULL otherwise. |
d56b1705 | 792 | */ |
6fc77a54 SE |
793 | static struct batadv_nc_node * |
794 | batadv_nc_find_nc_node(struct batadv_orig_node *orig_node, | |
795 | struct batadv_orig_node *orig_neigh_node, | |
796 | bool in_coding) | |
d56b1705 MH |
797 | { |
798 | struct batadv_nc_node *nc_node, *nc_node_out = NULL; | |
799 | struct list_head *list; | |
800 | ||
801 | if (in_coding) | |
802 | list = &orig_neigh_node->in_coding_list; | |
803 | else | |
804 | list = &orig_neigh_node->out_coding_list; | |
805 | ||
806 | /* Traverse list of nc_nodes to orig_node */ | |
807 | rcu_read_lock(); | |
808 | list_for_each_entry_rcu(nc_node, list, list) { | |
809 | if (!batadv_compare_eth(nc_node->addr, orig_node->orig)) | |
810 | continue; | |
811 | ||
daf99b48 | 812 | if (!kref_get_unless_zero(&nc_node->refcount)) |
d56b1705 MH |
813 | continue; |
814 | ||
815 | /* Found a match */ | |
816 | nc_node_out = nc_node; | |
817 | break; | |
818 | } | |
819 | rcu_read_unlock(); | |
820 | ||
821 | return nc_node_out; | |
822 | } | |
823 | ||
824 | /** | |
7e9a8c2c | 825 | * batadv_nc_get_nc_node() - retrieves an nc node or creates the entry if it was |
d56b1705 MH |
826 | * not found |
827 | * @bat_priv: the bat priv with all the soft interface information | |
828 | * @orig_node: orig node originating the ogm packet | |
829 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
830 | * (can be equal to orig_node) | |
831 | * @in_coding: traverse incoming or outgoing network coding list | |
832 | * | |
62fe710f | 833 | * Return: the nc_node if found or created, NULL in case of an error. |
d56b1705 | 834 | */ |
6fc77a54 SE |
835 | static struct batadv_nc_node * |
836 | batadv_nc_get_nc_node(struct batadv_priv *bat_priv, | |
837 | struct batadv_orig_node *orig_node, | |
838 | struct batadv_orig_node *orig_neigh_node, | |
839 | bool in_coding) | |
d56b1705 MH |
840 | { |
841 | struct batadv_nc_node *nc_node; | |
842 | spinlock_t *lock; /* Used to lock list selected by "int in_coding" */ | |
843 | struct list_head *list; | |
844 | ||
fa122fec SE |
845 | /* Select ingoing or outgoing coding node */ |
846 | if (in_coding) { | |
847 | lock = &orig_neigh_node->in_coding_list_lock; | |
848 | list = &orig_neigh_node->in_coding_list; | |
849 | } else { | |
850 | lock = &orig_neigh_node->out_coding_list_lock; | |
851 | list = &orig_neigh_node->out_coding_list; | |
852 | } | |
853 | ||
854 | spin_lock_bh(lock); | |
855 | ||
d56b1705 MH |
856 | /* Check if nc_node is already added */ |
857 | nc_node = batadv_nc_find_nc_node(orig_node, orig_neigh_node, in_coding); | |
858 | ||
859 | /* Node found */ | |
860 | if (nc_node) | |
fa122fec | 861 | goto unlock; |
d56b1705 MH |
862 | |
863 | nc_node = kzalloc(sizeof(*nc_node), GFP_ATOMIC); | |
864 | if (!nc_node) | |
fa122fec | 865 | goto unlock; |
d56b1705 | 866 | |
d56b1705 MH |
867 | /* Initialize nc_node */ |
868 | INIT_LIST_HEAD(&nc_node->list); | |
daf99b48 | 869 | kref_init(&nc_node->refcount); |
55db2d59 SE |
870 | ether_addr_copy(nc_node->addr, orig_node->orig); |
871 | kref_get(&orig_neigh_node->refcount); | |
872 | nc_node->orig_node = orig_neigh_node; | |
d56b1705 | 873 | |
d56b1705 MH |
874 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_node %pM -> %pM\n", |
875 | nc_node->addr, nc_node->orig_node->orig); | |
876 | ||
877 | /* Add nc_node to orig_node */ | |
da7a26af | 878 | kref_get(&nc_node->refcount); |
d56b1705 | 879 | list_add_tail_rcu(&nc_node->list, list); |
fa122fec SE |
880 | |
881 | unlock: | |
d56b1705 MH |
882 | spin_unlock_bh(lock); |
883 | ||
884 | return nc_node; | |
d56b1705 MH |
885 | } |
886 | ||
887 | /** | |
7e9a8c2c | 888 | * batadv_nc_update_nc_node() - updates stored incoming and outgoing nc node |
34473822 | 889 | * structs (best called on incoming OGMs) |
d56b1705 MH |
890 | * @bat_priv: the bat priv with all the soft interface information |
891 | * @orig_node: orig node originating the ogm packet | |
892 | * @orig_neigh_node: neighboring orig node from which we received the ogm packet | |
893 | * (can be equal to orig_node) | |
894 | * @ogm_packet: incoming ogm packet | |
895 | * @is_single_hop_neigh: orig_node is a single hop neighbor | |
896 | */ | |
897 | void batadv_nc_update_nc_node(struct batadv_priv *bat_priv, | |
898 | struct batadv_orig_node *orig_node, | |
899 | struct batadv_orig_node *orig_neigh_node, | |
900 | struct batadv_ogm_packet *ogm_packet, | |
901 | int is_single_hop_neigh) | |
902 | { | |
4f248cff SE |
903 | struct batadv_nc_node *in_nc_node = NULL; |
904 | struct batadv_nc_node *out_nc_node = NULL; | |
d56b1705 MH |
905 | |
906 | /* Check if network coding is enabled */ | |
907 | if (!atomic_read(&bat_priv->network_coding)) | |
908 | goto out; | |
909 | ||
3f4841ff | 910 | /* check if orig node is network coding enabled */ |
4635469f | 911 | if (!test_bit(BATADV_ORIG_CAPA_HAS_NC, &orig_node->capabilities)) |
3f4841ff ML |
912 | goto out; |
913 | ||
d56b1705 MH |
914 | /* accept ogms from 'good' neighbors and single hop neighbors */ |
915 | if (!batadv_can_nc_with_orig(bat_priv, orig_node, ogm_packet) && | |
916 | !is_single_hop_neigh) | |
917 | goto out; | |
918 | ||
919 | /* Add orig_node as in_nc_node on hop */ | |
920 | in_nc_node = batadv_nc_get_nc_node(bat_priv, orig_node, | |
921 | orig_neigh_node, true); | |
922 | if (!in_nc_node) | |
923 | goto out; | |
924 | ||
925 | in_nc_node->last_seen = jiffies; | |
926 | ||
927 | /* Add hop as out_nc_node on orig_node */ | |
928 | out_nc_node = batadv_nc_get_nc_node(bat_priv, orig_neigh_node, | |
929 | orig_node, false); | |
930 | if (!out_nc_node) | |
931 | goto out; | |
932 | ||
933 | out_nc_node->last_seen = jiffies; | |
934 | ||
935 | out: | |
936 | if (in_nc_node) | |
27ad7545 | 937 | batadv_nc_node_put(in_nc_node); |
d56b1705 | 938 | if (out_nc_node) |
27ad7545 | 939 | batadv_nc_node_put(out_nc_node); |
d56b1705 MH |
940 | } |
941 | ||
95332477 | 942 | /** |
7e9a8c2c | 943 | * batadv_nc_get_path() - get existing nc_path or allocate a new one |
95332477 MH |
944 | * @bat_priv: the bat priv with all the soft interface information |
945 | * @hash: hash table containing the nc path | |
946 | * @src: ethernet source address - first half of the nc path search key | |
947 | * @dst: ethernet destination address - second half of the nc path search key | |
948 | * | |
62fe710f | 949 | * Return: pointer to nc_path if the path was found or created, returns NULL |
95332477 MH |
950 | * on error. |
951 | */ | |
952 | static struct batadv_nc_path *batadv_nc_get_path(struct batadv_priv *bat_priv, | |
953 | struct batadv_hashtable *hash, | |
6b5e971a SE |
954 | u8 *src, |
955 | u8 *dst) | |
95332477 MH |
956 | { |
957 | int hash_added; | |
958 | struct batadv_nc_path *nc_path, nc_path_key; | |
959 | ||
960 | batadv_nc_hash_key_gen(&nc_path_key, src, dst); | |
961 | ||
962 | /* Search for existing nc_path */ | |
963 | nc_path = batadv_nc_hash_find(hash, (void *)&nc_path_key); | |
964 | ||
965 | if (nc_path) { | |
966 | /* Set timestamp to delay removal of nc_path */ | |
967 | nc_path->last_valid = jiffies; | |
968 | return nc_path; | |
969 | } | |
970 | ||
971 | /* No existing nc_path was found; create a new */ | |
972 | nc_path = kzalloc(sizeof(*nc_path), GFP_ATOMIC); | |
973 | ||
974 | if (!nc_path) | |
975 | return NULL; | |
976 | ||
977 | /* Initialize nc_path */ | |
978 | INIT_LIST_HEAD(&nc_path->packet_list); | |
979 | spin_lock_init(&nc_path->packet_list_lock); | |
727e0cd5 | 980 | kref_init(&nc_path->refcount); |
95332477 | 981 | nc_path->last_valid = jiffies; |
8fdd0153 AQ |
982 | ether_addr_copy(nc_path->next_hop, dst); |
983 | ether_addr_copy(nc_path->prev_hop, src); | |
95332477 MH |
984 | |
985 | batadv_dbg(BATADV_DBG_NC, bat_priv, "Adding nc_path %pM -> %pM\n", | |
986 | nc_path->prev_hop, | |
987 | nc_path->next_hop); | |
988 | ||
989 | /* Add nc_path to hash table */ | |
f489eab5 | 990 | kref_get(&nc_path->refcount); |
95332477 MH |
991 | hash_added = batadv_hash_add(hash, batadv_nc_hash_compare, |
992 | batadv_nc_hash_choose, &nc_path_key, | |
993 | &nc_path->hash_entry); | |
994 | ||
995 | if (hash_added < 0) { | |
996 | kfree(nc_path); | |
997 | return NULL; | |
998 | } | |
999 | ||
1000 | return nc_path; | |
1001 | } | |
1002 | ||
3c12de9a | 1003 | /** |
7e9a8c2c | 1004 | * batadv_nc_random_weight_tq() - scale the receivers TQ-value to avoid unfair |
3c12de9a MH |
1005 | * selection of a receiver with slightly lower TQ than the other |
1006 | * @tq: to be weighted tq value | |
672e7978 SE |
1007 | * |
1008 | * Return: scaled tq value | |
3c12de9a | 1009 | */ |
6b5e971a | 1010 | static u8 batadv_nc_random_weight_tq(u8 tq) |
3c12de9a | 1011 | { |
3c12de9a | 1012 | /* randomize the estimated packet loss (max TQ - estimated TQ) */ |
fd0c42c4 | 1013 | u8 rand_tq = prandom_u32_max(BATADV_TQ_MAX_VALUE + 1 - tq); |
3c12de9a MH |
1014 | |
1015 | /* convert to (randomized) estimated tq again */ | |
1016 | return BATADV_TQ_MAX_VALUE - rand_tq; | |
1017 | } | |
1018 | ||
1019 | /** | |
7e9a8c2c | 1020 | * batadv_nc_memxor() - XOR destination with source |
3c12de9a MH |
1021 | * @dst: byte array to XOR into |
1022 | * @src: byte array to XOR from | |
1023 | * @len: length of destination array | |
1024 | */ | |
1025 | static void batadv_nc_memxor(char *dst, const char *src, unsigned int len) | |
1026 | { | |
1027 | unsigned int i; | |
1028 | ||
1029 | for (i = 0; i < len; ++i) | |
1030 | dst[i] ^= src[i]; | |
1031 | } | |
1032 | ||
1033 | /** | |
7e9a8c2c | 1034 | * batadv_nc_code_packets() - code a received unicast_packet with an nc packet |
3c12de9a MH |
1035 | * into a coded_packet and send it |
1036 | * @bat_priv: the bat priv with all the soft interface information | |
1037 | * @skb: data skb to forward | |
1038 | * @ethhdr: pointer to the ethernet header inside the skb | |
1039 | * @nc_packet: structure containing the packet to the skb can be coded with | |
1040 | * @neigh_node: next hop to forward packet to | |
1041 | * | |
62fe710f | 1042 | * Return: true if both packets are consumed, false otherwise. |
3c12de9a MH |
1043 | */ |
1044 | static bool batadv_nc_code_packets(struct batadv_priv *bat_priv, | |
1045 | struct sk_buff *skb, | |
1046 | struct ethhdr *ethhdr, | |
1047 | struct batadv_nc_packet *nc_packet, | |
1048 | struct batadv_neigh_node *neigh_node) | |
1049 | { | |
6b5e971a | 1050 | u8 tq_weighted_neigh, tq_weighted_coding, tq_tmp; |
3c12de9a MH |
1051 | struct sk_buff *skb_dest, *skb_src; |
1052 | struct batadv_unicast_packet *packet1; | |
1053 | struct batadv_unicast_packet *packet2; | |
1054 | struct batadv_coded_packet *coded_packet; | |
95d39278 AQ |
1055 | struct batadv_neigh_node *neigh_tmp, *router_neigh, *first_dest; |
1056 | struct batadv_neigh_node *router_coding = NULL, *second_dest; | |
89652331 SW |
1057 | struct batadv_neigh_ifinfo *router_neigh_ifinfo = NULL; |
1058 | struct batadv_neigh_ifinfo *router_coding_ifinfo = NULL; | |
95d39278 | 1059 | u8 *first_source, *second_source; |
3c12de9a MH |
1060 | __be32 packet_id1, packet_id2; |
1061 | size_t count; | |
1062 | bool res = false; | |
1063 | int coding_len; | |
1064 | int unicast_size = sizeof(*packet1); | |
1065 | int coded_size = sizeof(*coded_packet); | |
1066 | int header_add = coded_size - unicast_size; | |
1067 | ||
7351a482 SW |
1068 | /* TODO: do we need to consider the outgoing interface for |
1069 | * coded packets? | |
1070 | */ | |
1071 | router_neigh = batadv_orig_router_get(neigh_node->orig_node, | |
1072 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1073 | if (!router_neigh) |
1074 | goto out; | |
1075 | ||
89652331 SW |
1076 | router_neigh_ifinfo = batadv_neigh_ifinfo_get(router_neigh, |
1077 | BATADV_IF_DEFAULT); | |
1078 | if (!router_neigh_ifinfo) | |
1079 | goto out; | |
1080 | ||
3c12de9a | 1081 | neigh_tmp = nc_packet->neigh_node; |
7351a482 SW |
1082 | router_coding = batadv_orig_router_get(neigh_tmp->orig_node, |
1083 | BATADV_IF_DEFAULT); | |
3c12de9a MH |
1084 | if (!router_coding) |
1085 | goto out; | |
1086 | ||
89652331 SW |
1087 | router_coding_ifinfo = batadv_neigh_ifinfo_get(router_coding, |
1088 | BATADV_IF_DEFAULT); | |
1089 | if (!router_coding_ifinfo) | |
1090 | goto out; | |
1091 | ||
1092 | tq_tmp = router_neigh_ifinfo->bat_iv.tq_avg; | |
1093 | tq_weighted_neigh = batadv_nc_random_weight_tq(tq_tmp); | |
1094 | tq_tmp = router_coding_ifinfo->bat_iv.tq_avg; | |
1095 | tq_weighted_coding = batadv_nc_random_weight_tq(tq_tmp); | |
3c12de9a MH |
1096 | |
1097 | /* Select one destination for the MAC-header dst-field based on | |
1098 | * weighted TQ-values. | |
1099 | */ | |
1100 | if (tq_weighted_neigh >= tq_weighted_coding) { | |
1101 | /* Destination from nc_packet is selected for MAC-header */ | |
95d39278 | 1102 | first_dest = nc_packet->neigh_node; |
3c12de9a | 1103 | first_source = nc_packet->nc_path->prev_hop; |
95d39278 | 1104 | second_dest = neigh_node; |
3c12de9a MH |
1105 | second_source = ethhdr->h_source; |
1106 | packet1 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1107 | packet2 = (struct batadv_unicast_packet *)skb->data; | |
1108 | packet_id1 = nc_packet->packet_id; | |
1109 | packet_id2 = batadv_skb_crc32(skb, | |
1110 | skb->data + sizeof(*packet2)); | |
1111 | } else { | |
1112 | /* Destination for skb is selected for MAC-header */ | |
95d39278 | 1113 | first_dest = neigh_node; |
3c12de9a | 1114 | first_source = ethhdr->h_source; |
95d39278 | 1115 | second_dest = nc_packet->neigh_node; |
3c12de9a MH |
1116 | second_source = nc_packet->nc_path->prev_hop; |
1117 | packet1 = (struct batadv_unicast_packet *)skb->data; | |
1118 | packet2 = (struct batadv_unicast_packet *)nc_packet->skb->data; | |
1119 | packet_id1 = batadv_skb_crc32(skb, | |
1120 | skb->data + sizeof(*packet1)); | |
1121 | packet_id2 = nc_packet->packet_id; | |
1122 | } | |
1123 | ||
1124 | /* Instead of zero padding the smallest data buffer, we | |
1125 | * code into the largest. | |
1126 | */ | |
1127 | if (skb->len <= nc_packet->skb->len) { | |
1128 | skb_dest = nc_packet->skb; | |
1129 | skb_src = skb; | |
1130 | } else { | |
1131 | skb_dest = skb; | |
1132 | skb_src = nc_packet->skb; | |
1133 | } | |
1134 | ||
1135 | /* coding_len is used when decoding the packet shorter packet */ | |
1136 | coding_len = skb_src->len - unicast_size; | |
1137 | ||
1138 | if (skb_linearize(skb_dest) < 0 || skb_linearize(skb_src) < 0) | |
1139 | goto out; | |
1140 | ||
1141 | skb_push(skb_dest, header_add); | |
1142 | ||
1143 | coded_packet = (struct batadv_coded_packet *)skb_dest->data; | |
1144 | skb_reset_mac_header(skb_dest); | |
1145 | ||
a40d9b07 SW |
1146 | coded_packet->packet_type = BATADV_CODED; |
1147 | coded_packet->version = BATADV_COMPAT_VERSION; | |
1148 | coded_packet->ttl = packet1->ttl; | |
3c12de9a MH |
1149 | |
1150 | /* Info about first unicast packet */ | |
8fdd0153 AQ |
1151 | ether_addr_copy(coded_packet->first_source, first_source); |
1152 | ether_addr_copy(coded_packet->first_orig_dest, packet1->dest); | |
3c12de9a MH |
1153 | coded_packet->first_crc = packet_id1; |
1154 | coded_packet->first_ttvn = packet1->ttvn; | |
1155 | ||
1156 | /* Info about second unicast packet */ | |
95d39278 | 1157 | ether_addr_copy(coded_packet->second_dest, second_dest->addr); |
8fdd0153 AQ |
1158 | ether_addr_copy(coded_packet->second_source, second_source); |
1159 | ether_addr_copy(coded_packet->second_orig_dest, packet2->dest); | |
3c12de9a | 1160 | coded_packet->second_crc = packet_id2; |
a40d9b07 | 1161 | coded_packet->second_ttl = packet2->ttl; |
3c12de9a MH |
1162 | coded_packet->second_ttvn = packet2->ttvn; |
1163 | coded_packet->coded_len = htons(coding_len); | |
1164 | ||
1165 | /* This is where the magic happens: Code skb_src into skb_dest */ | |
1166 | batadv_nc_memxor(skb_dest->data + coded_size, | |
1167 | skb_src->data + unicast_size, coding_len); | |
1168 | ||
1169 | /* Update counters accordingly */ | |
1170 | if (BATADV_SKB_CB(skb_src)->decoded && | |
1171 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1172 | /* Both packets are recoded */ | |
1173 | count = skb_src->len + ETH_HLEN; | |
1174 | count += skb_dest->len + ETH_HLEN; | |
1175 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE, 2); | |
1176 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, count); | |
1177 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1178 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1179 | /* Both packets are newly coded */ | |
1180 | count = skb_src->len + ETH_HLEN; | |
1181 | count += skb_dest->len + ETH_HLEN; | |
1182 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE, 2); | |
1183 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, count); | |
1184 | } else if (BATADV_SKB_CB(skb_src)->decoded && | |
1185 | !BATADV_SKB_CB(skb_dest)->decoded) { | |
1186 | /* skb_src recoded and skb_dest is newly coded */ | |
1187 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1188 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1189 | skb_src->len + ETH_HLEN); | |
1190 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1191 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1192 | skb_dest->len + ETH_HLEN); | |
1193 | } else if (!BATADV_SKB_CB(skb_src)->decoded && | |
1194 | BATADV_SKB_CB(skb_dest)->decoded) { | |
1195 | /* skb_src is newly coded and skb_dest is recoded */ | |
1196 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_CODE); | |
1197 | batadv_add_counter(bat_priv, BATADV_CNT_NC_CODE_BYTES, | |
1198 | skb_src->len + ETH_HLEN); | |
1199 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_RECODE); | |
1200 | batadv_add_counter(bat_priv, BATADV_CNT_NC_RECODE_BYTES, | |
1201 | skb_dest->len + ETH_HLEN); | |
1202 | } | |
1203 | ||
1204 | /* skb_src is now coded into skb_dest, so free it */ | |
bd687fe4 | 1205 | consume_skb(skb_src); |
3c12de9a MH |
1206 | |
1207 | /* avoid duplicate free of skb from nc_packet */ | |
1208 | nc_packet->skb = NULL; | |
bd687fe4 | 1209 | batadv_nc_packet_free(nc_packet, false); |
3c12de9a MH |
1210 | |
1211 | /* Send the coded packet and return true */ | |
95d39278 | 1212 | batadv_send_unicast_skb(skb_dest, first_dest); |
3c12de9a MH |
1213 | res = true; |
1214 | out: | |
1215 | if (router_neigh) | |
25bb2509 | 1216 | batadv_neigh_node_put(router_neigh); |
3c12de9a | 1217 | if (router_coding) |
25bb2509 | 1218 | batadv_neigh_node_put(router_coding); |
89652331 | 1219 | if (router_neigh_ifinfo) |
044fa3ae | 1220 | batadv_neigh_ifinfo_put(router_neigh_ifinfo); |
89652331 | 1221 | if (router_coding_ifinfo) |
044fa3ae | 1222 | batadv_neigh_ifinfo_put(router_coding_ifinfo); |
3c12de9a MH |
1223 | return res; |
1224 | } | |
1225 | ||
1226 | /** | |
7e9a8c2c | 1227 | * batadv_nc_skb_coding_possible() - true if a decoded skb is available at dst. |
3c12de9a MH |
1228 | * @skb: data skb to forward |
1229 | * @dst: destination mac address of the other skb to code with | |
1230 | * @src: source mac address of skb | |
1231 | * | |
1232 | * Whenever we network code a packet we have to check whether we received it in | |
1233 | * a network coded form. If so, we may not be able to use it for coding because | |
1234 | * some neighbors may also have received (overheard) the packet in the network | |
1235 | * coded form without being able to decode it. It is hard to know which of the | |
1236 | * neighboring nodes was able to decode the packet, therefore we can only | |
1237 | * re-code the packet if the source of the previous encoded packet is involved. | |
1238 | * Since the source encoded the packet we can be certain it has all necessary | |
1239 | * decode information. | |
1240 | * | |
62fe710f | 1241 | * Return: true if coding of a decoded packet is allowed. |
3c12de9a | 1242 | */ |
6b5e971a | 1243 | static bool batadv_nc_skb_coding_possible(struct sk_buff *skb, u8 *dst, u8 *src) |
3c12de9a MH |
1244 | { |
1245 | if (BATADV_SKB_CB(skb)->decoded && !batadv_compare_eth(dst, src)) | |
1246 | return false; | |
24820df1 | 1247 | return true; |
3c12de9a MH |
1248 | } |
1249 | ||
1250 | /** | |
7e9a8c2c | 1251 | * batadv_nc_path_search() - Find the coding path matching in_nc_node and |
3c12de9a MH |
1252 | * out_nc_node to retrieve a buffered packet that can be used for coding. |
1253 | * @bat_priv: the bat priv with all the soft interface information | |
1254 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1255 | * @out_nc_node: pointer to skb source's neighbor nc node | |
1256 | * @skb: data skb to forward | |
1257 | * @eth_dst: next hop mac address of skb | |
1258 | * | |
62fe710f | 1259 | * Return: true if coding of a decoded skb is allowed. |
3c12de9a MH |
1260 | */ |
1261 | static struct batadv_nc_packet * | |
1262 | batadv_nc_path_search(struct batadv_priv *bat_priv, | |
1263 | struct batadv_nc_node *in_nc_node, | |
1264 | struct batadv_nc_node *out_nc_node, | |
1265 | struct sk_buff *skb, | |
6b5e971a | 1266 | u8 *eth_dst) |
3c12de9a MH |
1267 | { |
1268 | struct batadv_nc_path *nc_path, nc_path_key; | |
1269 | struct batadv_nc_packet *nc_packet_out = NULL; | |
1270 | struct batadv_nc_packet *nc_packet, *nc_packet_tmp; | |
1271 | struct batadv_hashtable *hash = bat_priv->nc.coding_hash; | |
1272 | int idx; | |
1273 | ||
1274 | if (!hash) | |
1275 | return NULL; | |
1276 | ||
1277 | /* Create almost path key */ | |
1278 | batadv_nc_hash_key_gen(&nc_path_key, in_nc_node->addr, | |
1279 | out_nc_node->addr); | |
1280 | idx = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1281 | ||
1282 | /* Check for coding opportunities in this nc_path */ | |
1283 | rcu_read_lock(); | |
1284 | hlist_for_each_entry_rcu(nc_path, &hash->table[idx], hash_entry) { | |
1285 | if (!batadv_compare_eth(nc_path->prev_hop, in_nc_node->addr)) | |
1286 | continue; | |
1287 | ||
1288 | if (!batadv_compare_eth(nc_path->next_hop, out_nc_node->addr)) | |
1289 | continue; | |
1290 | ||
1291 | spin_lock_bh(&nc_path->packet_list_lock); | |
1292 | if (list_empty(&nc_path->packet_list)) { | |
1293 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1294 | continue; | |
1295 | } | |
1296 | ||
1297 | list_for_each_entry_safe(nc_packet, nc_packet_tmp, | |
1298 | &nc_path->packet_list, list) { | |
1299 | if (!batadv_nc_skb_coding_possible(nc_packet->skb, | |
1300 | eth_dst, | |
1301 | in_nc_node->addr)) | |
1302 | continue; | |
1303 | ||
1304 | /* Coding opportunity is found! */ | |
1305 | list_del(&nc_packet->list); | |
1306 | nc_packet_out = nc_packet; | |
1307 | break; | |
1308 | } | |
1309 | ||
1310 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1311 | break; | |
1312 | } | |
1313 | rcu_read_unlock(); | |
1314 | ||
1315 | return nc_packet_out; | |
1316 | } | |
1317 | ||
1318 | /** | |
7e9a8c2c SE |
1319 | * batadv_nc_skb_src_search() - Loops through the list of neighoring nodes of |
1320 | * the skb's sender (may be equal to the originator). | |
3c12de9a MH |
1321 | * @bat_priv: the bat priv with all the soft interface information |
1322 | * @skb: data skb to forward | |
1323 | * @eth_dst: next hop mac address of skb | |
1324 | * @eth_src: source mac address of skb | |
1325 | * @in_nc_node: pointer to skb next hop's neighbor nc node | |
1326 | * | |
62fe710f | 1327 | * Return: an nc packet if a suitable coding packet was found, NULL otherwise. |
3c12de9a MH |
1328 | */ |
1329 | static struct batadv_nc_packet * | |
1330 | batadv_nc_skb_src_search(struct batadv_priv *bat_priv, | |
1331 | struct sk_buff *skb, | |
6b5e971a SE |
1332 | u8 *eth_dst, |
1333 | u8 *eth_src, | |
3c12de9a MH |
1334 | struct batadv_nc_node *in_nc_node) |
1335 | { | |
1336 | struct batadv_orig_node *orig_node; | |
1337 | struct batadv_nc_node *out_nc_node; | |
1338 | struct batadv_nc_packet *nc_packet = NULL; | |
1339 | ||
1340 | orig_node = batadv_orig_hash_find(bat_priv, eth_src); | |
1341 | if (!orig_node) | |
1342 | return NULL; | |
1343 | ||
1344 | rcu_read_lock(); | |
1345 | list_for_each_entry_rcu(out_nc_node, | |
1346 | &orig_node->out_coding_list, list) { | |
1347 | /* Check if the skb is decoded and if recoding is possible */ | |
1348 | if (!batadv_nc_skb_coding_possible(skb, | |
1349 | out_nc_node->addr, eth_src)) | |
1350 | continue; | |
1351 | ||
1352 | /* Search for an opportunity in this nc_path */ | |
1353 | nc_packet = batadv_nc_path_search(bat_priv, in_nc_node, | |
1354 | out_nc_node, skb, eth_dst); | |
1355 | if (nc_packet) | |
1356 | break; | |
1357 | } | |
1358 | rcu_read_unlock(); | |
1359 | ||
5d967310 | 1360 | batadv_orig_node_put(orig_node); |
3c12de9a MH |
1361 | return nc_packet; |
1362 | } | |
1363 | ||
612d2b4f | 1364 | /** |
7e9a8c2c | 1365 | * batadv_nc_skb_store_before_coding() - set the ethernet src and dst of the |
612d2b4f MH |
1366 | * unicast skb before it is stored for use in later decoding |
1367 | * @bat_priv: the bat priv with all the soft interface information | |
1368 | * @skb: data skb to store | |
1369 | * @eth_dst_new: new destination mac address of skb | |
1370 | */ | |
1371 | static void batadv_nc_skb_store_before_coding(struct batadv_priv *bat_priv, | |
1372 | struct sk_buff *skb, | |
6b5e971a | 1373 | u8 *eth_dst_new) |
612d2b4f MH |
1374 | { |
1375 | struct ethhdr *ethhdr; | |
1376 | ||
1377 | /* Copy skb header to change the mac header */ | |
bad93e9d | 1378 | skb = pskb_copy_for_clone(skb, GFP_ATOMIC); |
612d2b4f MH |
1379 | if (!skb) |
1380 | return; | |
1381 | ||
1382 | /* Set the mac header as if we actually sent the packet uncoded */ | |
7ed4be95 | 1383 | ethhdr = eth_hdr(skb); |
8fdd0153 AQ |
1384 | ether_addr_copy(ethhdr->h_source, ethhdr->h_dest); |
1385 | ether_addr_copy(ethhdr->h_dest, eth_dst_new); | |
612d2b4f MH |
1386 | |
1387 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1388 | skb_push(skb, ETH_HLEN); | |
1389 | ||
1390 | /* Add the packet to the decoding packet pool */ | |
1391 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1392 | ||
1393 | /* batadv_nc_skb_store_for_decoding() clones the skb, so we must free | |
1394 | * our ref | |
1395 | */ | |
bd687fe4 | 1396 | consume_skb(skb); |
612d2b4f MH |
1397 | } |
1398 | ||
3c12de9a | 1399 | /** |
7e9a8c2c | 1400 | * batadv_nc_skb_dst_search() - Loops through list of neighboring nodes to dst. |
3c12de9a MH |
1401 | * @skb: data skb to forward |
1402 | * @neigh_node: next hop to forward packet to | |
1403 | * @ethhdr: pointer to the ethernet header inside the skb | |
1404 | * | |
1405 | * Loops through list of neighboring nodes the next hop has a good connection to | |
1406 | * (receives OGMs with a sufficient quality). We need to find a neighbor of our | |
1407 | * next hop that potentially sent a packet which our next hop also received | |
1408 | * (overheard) and has stored for later decoding. | |
1409 | * | |
62fe710f | 1410 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
3c12de9a MH |
1411 | */ |
1412 | static bool batadv_nc_skb_dst_search(struct sk_buff *skb, | |
1413 | struct batadv_neigh_node *neigh_node, | |
1414 | struct ethhdr *ethhdr) | |
1415 | { | |
1416 | struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1417 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1418 | struct batadv_orig_node *orig_node = neigh_node->orig_node; | |
1419 | struct batadv_nc_node *nc_node; | |
1420 | struct batadv_nc_packet *nc_packet = NULL; | |
1421 | ||
1422 | rcu_read_lock(); | |
1423 | list_for_each_entry_rcu(nc_node, &orig_node->in_coding_list, list) { | |
1424 | /* Search for coding opportunity with this in_nc_node */ | |
1425 | nc_packet = batadv_nc_skb_src_search(bat_priv, skb, | |
1426 | neigh_node->addr, | |
1427 | ethhdr->h_source, nc_node); | |
1428 | ||
1429 | /* Opportunity was found, so stop searching */ | |
1430 | if (nc_packet) | |
1431 | break; | |
1432 | } | |
1433 | rcu_read_unlock(); | |
1434 | ||
1435 | if (!nc_packet) | |
1436 | return false; | |
1437 | ||
612d2b4f MH |
1438 | /* Save packets for later decoding */ |
1439 | batadv_nc_skb_store_before_coding(bat_priv, skb, | |
1440 | neigh_node->addr); | |
1441 | batadv_nc_skb_store_before_coding(bat_priv, nc_packet->skb, | |
1442 | nc_packet->neigh_node->addr); | |
1443 | ||
3c12de9a MH |
1444 | /* Code and send packets */ |
1445 | if (batadv_nc_code_packets(bat_priv, skb, ethhdr, nc_packet, | |
1446 | neigh_node)) | |
1447 | return true; | |
1448 | ||
1449 | /* out of mem ? Coding failed - we have to free the buffered packet | |
1450 | * to avoid memleaks. The skb passed as argument will be dealt with | |
1451 | * by the calling function. | |
1452 | */ | |
1453 | batadv_nc_send_packet(nc_packet); | |
1454 | return false; | |
1455 | } | |
1456 | ||
95332477 | 1457 | /** |
7e9a8c2c | 1458 | * batadv_nc_skb_add_to_path() - buffer skb for later encoding / decoding |
95332477 MH |
1459 | * @skb: skb to add to path |
1460 | * @nc_path: path to add skb to | |
1461 | * @neigh_node: next hop to forward packet to | |
1462 | * @packet_id: checksum to identify packet | |
1463 | * | |
62fe710f | 1464 | * Return: true if the packet was buffered or false in case of an error. |
95332477 MH |
1465 | */ |
1466 | static bool batadv_nc_skb_add_to_path(struct sk_buff *skb, | |
1467 | struct batadv_nc_path *nc_path, | |
1468 | struct batadv_neigh_node *neigh_node, | |
1469 | __be32 packet_id) | |
1470 | { | |
1471 | struct batadv_nc_packet *nc_packet; | |
1472 | ||
1473 | nc_packet = kzalloc(sizeof(*nc_packet), GFP_ATOMIC); | |
1474 | if (!nc_packet) | |
1475 | return false; | |
1476 | ||
1477 | /* Initialize nc_packet */ | |
1478 | nc_packet->timestamp = jiffies; | |
1479 | nc_packet->packet_id = packet_id; | |
1480 | nc_packet->skb = skb; | |
1481 | nc_packet->neigh_node = neigh_node; | |
1482 | nc_packet->nc_path = nc_path; | |
1483 | ||
1484 | /* Add coding packet to list */ | |
1485 | spin_lock_bh(&nc_path->packet_list_lock); | |
1486 | list_add_tail(&nc_packet->list, &nc_path->packet_list); | |
1487 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1488 | ||
1489 | return true; | |
1490 | } | |
1491 | ||
1492 | /** | |
7e9a8c2c | 1493 | * batadv_nc_skb_forward() - try to code a packet or add it to the coding packet |
95332477 MH |
1494 | * buffer |
1495 | * @skb: data skb to forward | |
1496 | * @neigh_node: next hop to forward packet to | |
95332477 | 1497 | * |
62fe710f | 1498 | * Return: true if the skb was consumed (encoded packet sent) or false otherwise |
95332477 MH |
1499 | */ |
1500 | bool batadv_nc_skb_forward(struct sk_buff *skb, | |
e91ecfc6 | 1501 | struct batadv_neigh_node *neigh_node) |
95332477 MH |
1502 | { |
1503 | const struct net_device *netdev = neigh_node->if_incoming->soft_iface; | |
1504 | struct batadv_priv *bat_priv = netdev_priv(netdev); | |
1505 | struct batadv_unicast_packet *packet; | |
1506 | struct batadv_nc_path *nc_path; | |
e91ecfc6 | 1507 | struct ethhdr *ethhdr = eth_hdr(skb); |
95332477 MH |
1508 | __be32 packet_id; |
1509 | u8 *payload; | |
1510 | ||
1511 | /* Check if network coding is enabled */ | |
1512 | if (!atomic_read(&bat_priv->network_coding)) | |
1513 | goto out; | |
1514 | ||
1515 | /* We only handle unicast packets */ | |
1516 | payload = skb_network_header(skb); | |
1517 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1518 | if (packet->packet_type != BATADV_UNICAST) |
95332477 MH |
1519 | goto out; |
1520 | ||
3c12de9a MH |
1521 | /* Try to find a coding opportunity and send the skb if one is found */ |
1522 | if (batadv_nc_skb_dst_search(skb, neigh_node, ethhdr)) | |
1523 | return true; | |
1524 | ||
95332477 MH |
1525 | /* Find or create a nc_path for this src-dst pair */ |
1526 | nc_path = batadv_nc_get_path(bat_priv, | |
1527 | bat_priv->nc.coding_hash, | |
1528 | ethhdr->h_source, | |
1529 | neigh_node->addr); | |
1530 | ||
1531 | if (!nc_path) | |
1532 | goto out; | |
1533 | ||
1534 | /* Add skb to nc_path */ | |
1535 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1536 | if (!batadv_nc_skb_add_to_path(skb, nc_path, neigh_node, packet_id)) | |
1537 | goto free_nc_path; | |
1538 | ||
1539 | /* Packet is consumed */ | |
1540 | return true; | |
1541 | ||
1542 | free_nc_path: | |
5fff2825 | 1543 | batadv_nc_path_put(nc_path); |
95332477 MH |
1544 | out: |
1545 | /* Packet is not consumed */ | |
1546 | return false; | |
1547 | } | |
1548 | ||
612d2b4f | 1549 | /** |
7e9a8c2c SE |
1550 | * batadv_nc_skb_store_for_decoding() - save a clone of the skb which can be |
1551 | * used when decoding coded packets | |
612d2b4f MH |
1552 | * @bat_priv: the bat priv with all the soft interface information |
1553 | * @skb: data skb to store | |
1554 | */ | |
1555 | void batadv_nc_skb_store_for_decoding(struct batadv_priv *bat_priv, | |
1556 | struct sk_buff *skb) | |
1557 | { | |
1558 | struct batadv_unicast_packet *packet; | |
1559 | struct batadv_nc_path *nc_path; | |
7ed4be95 | 1560 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f MH |
1561 | __be32 packet_id; |
1562 | u8 *payload; | |
1563 | ||
1564 | /* Check if network coding is enabled */ | |
1565 | if (!atomic_read(&bat_priv->network_coding)) | |
1566 | goto out; | |
1567 | ||
1568 | /* Check for supported packet type */ | |
1569 | payload = skb_network_header(skb); | |
1570 | packet = (struct batadv_unicast_packet *)payload; | |
a40d9b07 | 1571 | if (packet->packet_type != BATADV_UNICAST) |
612d2b4f MH |
1572 | goto out; |
1573 | ||
1574 | /* Find existing nc_path or create a new */ | |
1575 | nc_path = batadv_nc_get_path(bat_priv, | |
1576 | bat_priv->nc.decoding_hash, | |
1577 | ethhdr->h_source, | |
1578 | ethhdr->h_dest); | |
1579 | ||
1580 | if (!nc_path) | |
1581 | goto out; | |
1582 | ||
1583 | /* Clone skb and adjust skb->data to point at batman header */ | |
1584 | skb = skb_clone(skb, GFP_ATOMIC); | |
1585 | if (unlikely(!skb)) | |
1586 | goto free_nc_path; | |
1587 | ||
1588 | if (unlikely(!pskb_may_pull(skb, ETH_HLEN))) | |
1589 | goto free_skb; | |
1590 | ||
1591 | if (unlikely(!skb_pull_rcsum(skb, ETH_HLEN))) | |
1592 | goto free_skb; | |
1593 | ||
1594 | /* Add skb to nc_path */ | |
1595 | packet_id = batadv_skb_crc32(skb, payload + sizeof(*packet)); | |
1596 | if (!batadv_nc_skb_add_to_path(skb, nc_path, NULL, packet_id)) | |
1597 | goto free_skb; | |
1598 | ||
1599 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_BUFFER); | |
1600 | return; | |
1601 | ||
1602 | free_skb: | |
1603 | kfree_skb(skb); | |
1604 | free_nc_path: | |
5fff2825 | 1605 | batadv_nc_path_put(nc_path); |
612d2b4f MH |
1606 | out: |
1607 | return; | |
1608 | } | |
1609 | ||
1610 | /** | |
7e9a8c2c | 1611 | * batadv_nc_skb_store_sniffed_unicast() - check if a received unicast packet |
612d2b4f MH |
1612 | * should be saved in the decoding buffer and, if so, store it there |
1613 | * @bat_priv: the bat priv with all the soft interface information | |
1614 | * @skb: unicast skb to store | |
1615 | */ | |
1616 | void batadv_nc_skb_store_sniffed_unicast(struct batadv_priv *bat_priv, | |
1617 | struct sk_buff *skb) | |
1618 | { | |
7ed4be95 | 1619 | struct ethhdr *ethhdr = eth_hdr(skb); |
612d2b4f | 1620 | |
6e0895c2 | 1621 | if (batadv_is_my_mac(bat_priv, ethhdr->h_dest)) |
612d2b4f MH |
1622 | return; |
1623 | ||
1624 | /* Set data pointer to MAC header to mimic packets from our tx path */ | |
1625 | skb_push(skb, ETH_HLEN); | |
1626 | ||
1627 | batadv_nc_skb_store_for_decoding(bat_priv, skb); | |
1628 | } | |
1629 | ||
2df5278b | 1630 | /** |
7e9a8c2c | 1631 | * batadv_nc_skb_decode_packet() - decode given skb using the decode data stored |
2df5278b | 1632 | * in nc_packet |
6e0895c2 | 1633 | * @bat_priv: the bat priv with all the soft interface information |
2df5278b MH |
1634 | * @skb: unicast skb to decode |
1635 | * @nc_packet: decode data needed to decode the skb | |
1636 | * | |
62fe710f | 1637 | * Return: pointer to decoded unicast packet if the packet was decoded or NULL |
2df5278b MH |
1638 | * in case of an error. |
1639 | */ | |
1640 | static struct batadv_unicast_packet * | |
6e0895c2 | 1641 | batadv_nc_skb_decode_packet(struct batadv_priv *bat_priv, struct sk_buff *skb, |
2df5278b MH |
1642 | struct batadv_nc_packet *nc_packet) |
1643 | { | |
1644 | const int h_size = sizeof(struct batadv_unicast_packet); | |
1645 | const int h_diff = sizeof(struct batadv_coded_packet) - h_size; | |
1646 | struct batadv_unicast_packet *unicast_packet; | |
1647 | struct batadv_coded_packet coded_packet_tmp; | |
1648 | struct ethhdr *ethhdr, ethhdr_tmp; | |
6b5e971a | 1649 | u8 *orig_dest, ttl, ttvn; |
2df5278b | 1650 | unsigned int coding_len; |
7da19971 | 1651 | int err; |
2df5278b MH |
1652 | |
1653 | /* Save headers temporarily */ | |
1654 | memcpy(&coded_packet_tmp, skb->data, sizeof(coded_packet_tmp)); | |
1655 | memcpy(ðhdr_tmp, skb_mac_header(skb), sizeof(ethhdr_tmp)); | |
1656 | ||
1657 | if (skb_cow(skb, 0) < 0) | |
1658 | return NULL; | |
1659 | ||
1660 | if (unlikely(!skb_pull_rcsum(skb, h_diff))) | |
1661 | return NULL; | |
1662 | ||
1663 | /* Data points to batman header, so set mac header 14 bytes before | |
1664 | * and network to data | |
1665 | */ | |
1666 | skb_set_mac_header(skb, -ETH_HLEN); | |
1667 | skb_reset_network_header(skb); | |
1668 | ||
1669 | /* Reconstruct original mac header */ | |
7ed4be95 | 1670 | ethhdr = eth_hdr(skb); |
abae9479 | 1671 | *ethhdr = ethhdr_tmp; |
2df5278b MH |
1672 | |
1673 | /* Select the correct unicast header information based on the location | |
1674 | * of our mac address in the coded_packet header | |
1675 | */ | |
6e0895c2 | 1676 | if (batadv_is_my_mac(bat_priv, coded_packet_tmp.second_dest)) { |
2df5278b MH |
1677 | /* If we are the second destination the packet was overheard, |
1678 | * so the Ethernet address must be copied to h_dest and | |
1679 | * pkt_type changed from PACKET_OTHERHOST to PACKET_HOST | |
1680 | */ | |
8fdd0153 | 1681 | ether_addr_copy(ethhdr->h_dest, coded_packet_tmp.second_dest); |
2df5278b MH |
1682 | skb->pkt_type = PACKET_HOST; |
1683 | ||
1684 | orig_dest = coded_packet_tmp.second_orig_dest; | |
1685 | ttl = coded_packet_tmp.second_ttl; | |
1686 | ttvn = coded_packet_tmp.second_ttvn; | |
1687 | } else { | |
1688 | orig_dest = coded_packet_tmp.first_orig_dest; | |
a40d9b07 | 1689 | ttl = coded_packet_tmp.ttl; |
2df5278b MH |
1690 | ttvn = coded_packet_tmp.first_ttvn; |
1691 | } | |
1692 | ||
1693 | coding_len = ntohs(coded_packet_tmp.coded_len); | |
1694 | ||
1695 | if (coding_len > skb->len) | |
1696 | return NULL; | |
1697 | ||
1698 | /* Here the magic is reversed: | |
1699 | * extract the missing packet from the received coded packet | |
1700 | */ | |
1701 | batadv_nc_memxor(skb->data + h_size, | |
1702 | nc_packet->skb->data + h_size, | |
1703 | coding_len); | |
1704 | ||
1705 | /* Resize decoded skb if decoded with larger packet */ | |
7da19971 ML |
1706 | if (nc_packet->skb->len > coding_len + h_size) { |
1707 | err = pskb_trim_rcsum(skb, coding_len + h_size); | |
1708 | if (err) | |
1709 | return NULL; | |
1710 | } | |
2df5278b MH |
1711 | |
1712 | /* Create decoded unicast packet */ | |
1713 | unicast_packet = (struct batadv_unicast_packet *)skb->data; | |
a40d9b07 SW |
1714 | unicast_packet->packet_type = BATADV_UNICAST; |
1715 | unicast_packet->version = BATADV_COMPAT_VERSION; | |
1716 | unicast_packet->ttl = ttl; | |
8fdd0153 | 1717 | ether_addr_copy(unicast_packet->dest, orig_dest); |
2df5278b MH |
1718 | unicast_packet->ttvn = ttvn; |
1719 | ||
bd687fe4 | 1720 | batadv_nc_packet_free(nc_packet, false); |
2df5278b MH |
1721 | return unicast_packet; |
1722 | } | |
1723 | ||
1724 | /** | |
7e9a8c2c | 1725 | * batadv_nc_find_decoding_packet() - search through buffered decoding data to |
2df5278b MH |
1726 | * find the data needed to decode the coded packet |
1727 | * @bat_priv: the bat priv with all the soft interface information | |
1728 | * @ethhdr: pointer to the ethernet header inside the coded packet | |
1729 | * @coded: coded packet we try to find decode data for | |
1730 | * | |
62fe710f | 1731 | * Return: pointer to nc packet if the needed data was found or NULL otherwise. |
2df5278b MH |
1732 | */ |
1733 | static struct batadv_nc_packet * | |
1734 | batadv_nc_find_decoding_packet(struct batadv_priv *bat_priv, | |
1735 | struct ethhdr *ethhdr, | |
1736 | struct batadv_coded_packet *coded) | |
1737 | { | |
1738 | struct batadv_hashtable *hash = bat_priv->nc.decoding_hash; | |
1739 | struct batadv_nc_packet *tmp_nc_packet, *nc_packet = NULL; | |
1740 | struct batadv_nc_path *nc_path, nc_path_key; | |
6b5e971a | 1741 | u8 *dest, *source; |
2df5278b MH |
1742 | __be32 packet_id; |
1743 | int index; | |
1744 | ||
1745 | if (!hash) | |
1746 | return NULL; | |
1747 | ||
1748 | /* Select the correct packet id based on the location of our mac-addr */ | |
1749 | dest = ethhdr->h_source; | |
6e0895c2 | 1750 | if (!batadv_is_my_mac(bat_priv, coded->second_dest)) { |
2df5278b MH |
1751 | source = coded->second_source; |
1752 | packet_id = coded->second_crc; | |
1753 | } else { | |
1754 | source = coded->first_source; | |
1755 | packet_id = coded->first_crc; | |
1756 | } | |
1757 | ||
1758 | batadv_nc_hash_key_gen(&nc_path_key, source, dest); | |
1759 | index = batadv_nc_hash_choose(&nc_path_key, hash->size); | |
1760 | ||
1761 | /* Search for matching coding path */ | |
1762 | rcu_read_lock(); | |
1763 | hlist_for_each_entry_rcu(nc_path, &hash->table[index], hash_entry) { | |
1764 | /* Find matching nc_packet */ | |
1765 | spin_lock_bh(&nc_path->packet_list_lock); | |
1766 | list_for_each_entry(tmp_nc_packet, | |
1767 | &nc_path->packet_list, list) { | |
1768 | if (packet_id == tmp_nc_packet->packet_id) { | |
1769 | list_del(&tmp_nc_packet->list); | |
1770 | ||
1771 | nc_packet = tmp_nc_packet; | |
1772 | break; | |
1773 | } | |
1774 | } | |
1775 | spin_unlock_bh(&nc_path->packet_list_lock); | |
1776 | ||
1777 | if (nc_packet) | |
1778 | break; | |
1779 | } | |
1780 | rcu_read_unlock(); | |
1781 | ||
1782 | if (!nc_packet) | |
1783 | batadv_dbg(BATADV_DBG_NC, bat_priv, | |
1784 | "No decoding packet found for %u\n", packet_id); | |
1785 | ||
1786 | return nc_packet; | |
1787 | } | |
1788 | ||
1789 | /** | |
7e9a8c2c | 1790 | * batadv_nc_recv_coded_packet() - try to decode coded packet and enqueue the |
2df5278b MH |
1791 | * resulting unicast packet |
1792 | * @skb: incoming coded packet | |
1793 | * @recv_if: pointer to interface this packet was received on | |
672e7978 SE |
1794 | * |
1795 | * Return: NET_RX_SUCCESS if the packet has been consumed or NET_RX_DROP | |
1796 | * otherwise. | |
2df5278b MH |
1797 | */ |
1798 | static int batadv_nc_recv_coded_packet(struct sk_buff *skb, | |
1799 | struct batadv_hard_iface *recv_if) | |
1800 | { | |
1801 | struct batadv_priv *bat_priv = netdev_priv(recv_if->soft_iface); | |
1802 | struct batadv_unicast_packet *unicast_packet; | |
1803 | struct batadv_coded_packet *coded_packet; | |
1804 | struct batadv_nc_packet *nc_packet; | |
1805 | struct ethhdr *ethhdr; | |
1806 | int hdr_size = sizeof(*coded_packet); | |
1807 | ||
1808 | /* Check if network coding is enabled */ | |
1809 | if (!atomic_read(&bat_priv->network_coding)) | |
b91a2543 | 1810 | goto free_skb; |
2df5278b MH |
1811 | |
1812 | /* Make sure we can access (and remove) header */ | |
1813 | if (unlikely(!pskb_may_pull(skb, hdr_size))) | |
b91a2543 | 1814 | goto free_skb; |
2df5278b MH |
1815 | |
1816 | coded_packet = (struct batadv_coded_packet *)skb->data; | |
7ed4be95 | 1817 | ethhdr = eth_hdr(skb); |
2df5278b MH |
1818 | |
1819 | /* Verify frame is destined for us */ | |
6e0895c2 DM |
1820 | if (!batadv_is_my_mac(bat_priv, ethhdr->h_dest) && |
1821 | !batadv_is_my_mac(bat_priv, coded_packet->second_dest)) | |
b91a2543 | 1822 | goto free_skb; |
2df5278b MH |
1823 | |
1824 | /* Update stat counter */ | |
6e0895c2 | 1825 | if (batadv_is_my_mac(bat_priv, coded_packet->second_dest)) |
2df5278b MH |
1826 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_SNIFFED); |
1827 | ||
1828 | nc_packet = batadv_nc_find_decoding_packet(bat_priv, ethhdr, | |
1829 | coded_packet); | |
1830 | if (!nc_packet) { | |
1831 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
b91a2543 | 1832 | goto free_skb; |
2df5278b MH |
1833 | } |
1834 | ||
1835 | /* Make skb's linear, because decoding accesses the entire buffer */ | |
1836 | if (skb_linearize(skb) < 0) | |
1837 | goto free_nc_packet; | |
1838 | ||
1839 | if (skb_linearize(nc_packet->skb) < 0) | |
1840 | goto free_nc_packet; | |
1841 | ||
1842 | /* Decode the packet */ | |
6e0895c2 | 1843 | unicast_packet = batadv_nc_skb_decode_packet(bat_priv, skb, nc_packet); |
2df5278b MH |
1844 | if (!unicast_packet) { |
1845 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE_FAILED); | |
1846 | goto free_nc_packet; | |
1847 | } | |
1848 | ||
1849 | /* Mark packet as decoded to do correct recoding when forwarding */ | |
1850 | BATADV_SKB_CB(skb)->decoded = true; | |
1851 | batadv_inc_counter(bat_priv, BATADV_CNT_NC_DECODE); | |
1852 | batadv_add_counter(bat_priv, BATADV_CNT_NC_DECODE_BYTES, | |
1853 | skb->len + ETH_HLEN); | |
1854 | return batadv_recv_unicast_packet(skb, recv_if); | |
1855 | ||
1856 | free_nc_packet: | |
bd687fe4 | 1857 | batadv_nc_packet_free(nc_packet, true); |
b91a2543 SE |
1858 | free_skb: |
1859 | kfree_skb(skb); | |
1860 | ||
2df5278b MH |
1861 | return NET_RX_DROP; |
1862 | } | |
1863 | ||
d353d8d4 | 1864 | /** |
7e9a8c2c | 1865 | * batadv_nc_mesh_free() - clean up network coding memory |
d353d8d4 MH |
1866 | * @bat_priv: the bat priv with all the soft interface information |
1867 | */ | |
6c519bad | 1868 | void batadv_nc_mesh_free(struct batadv_priv *bat_priv) |
d353d8d4 | 1869 | { |
3f4841ff ML |
1870 | batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_NC, 1); |
1871 | batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_NC, 1); | |
d353d8d4 | 1872 | cancel_delayed_work_sync(&bat_priv->nc.work); |
612d2b4f | 1873 | |
95332477 MH |
1874 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.coding_hash, NULL); |
1875 | batadv_hash_destroy(bat_priv->nc.coding_hash); | |
612d2b4f MH |
1876 | batadv_nc_purge_paths(bat_priv, bat_priv->nc.decoding_hash, NULL); |
1877 | batadv_hash_destroy(bat_priv->nc.decoding_hash); | |
d353d8d4 | 1878 | } |
d56b1705 | 1879 | |
dc1cbd14 | 1880 | #ifdef CONFIG_BATMAN_ADV_DEBUGFS |
d56b1705 | 1881 | /** |
7e9a8c2c | 1882 | * batadv_nc_nodes_seq_print_text() - print the nc node information |
d56b1705 MH |
1883 | * @seq: seq file to print on |
1884 | * @offset: not used | |
672e7978 SE |
1885 | * |
1886 | * Return: always 0 | |
d56b1705 MH |
1887 | */ |
1888 | int batadv_nc_nodes_seq_print_text(struct seq_file *seq, void *offset) | |
1889 | { | |
1890 | struct net_device *net_dev = (struct net_device *)seq->private; | |
1891 | struct batadv_priv *bat_priv = netdev_priv(net_dev); | |
1892 | struct batadv_hashtable *hash = bat_priv->orig_hash; | |
1893 | struct batadv_hard_iface *primary_if; | |
1894 | struct hlist_head *head; | |
1895 | struct batadv_orig_node *orig_node; | |
1896 | struct batadv_nc_node *nc_node; | |
1897 | int i; | |
1898 | ||
1899 | primary_if = batadv_seq_print_text_primary_if_get(seq); | |
1900 | if (!primary_if) | |
1901 | goto out; | |
1902 | ||
1903 | /* Traverse list of originators */ | |
1904 | for (i = 0; i < hash->size; i++) { | |
1905 | head = &hash->table[i]; | |
1906 | ||
1907 | /* For each orig_node in this bin */ | |
1908 | rcu_read_lock(); | |
1909 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { | |
aa27c312 ML |
1910 | /* no need to print the orig node if it does not have |
1911 | * network coding neighbors | |
1912 | */ | |
1913 | if (list_empty(&orig_node->in_coding_list) && | |
1914 | list_empty(&orig_node->out_coding_list)) | |
1915 | continue; | |
1916 | ||
d56b1705 MH |
1917 | seq_printf(seq, "Node: %pM\n", orig_node->orig); |
1918 | ||
0c814653 | 1919 | seq_puts(seq, " Ingoing: "); |
d56b1705 MH |
1920 | /* For each in_nc_node to this orig_node */ |
1921 | list_for_each_entry_rcu(nc_node, | |
1922 | &orig_node->in_coding_list, | |
1923 | list) | |
1924 | seq_printf(seq, "%pM ", | |
1925 | nc_node->addr); | |
912eeed9 | 1926 | seq_puts(seq, "\n Outgoing: "); |
d56b1705 MH |
1927 | /* For out_nc_node to this orig_node */ |
1928 | list_for_each_entry_rcu(nc_node, | |
1929 | &orig_node->out_coding_list, | |
1930 | list) | |
1931 | seq_printf(seq, "%pM ", | |
1932 | nc_node->addr); | |
0c814653 | 1933 | seq_puts(seq, "\n\n"); |
d56b1705 MH |
1934 | } |
1935 | rcu_read_unlock(); | |
1936 | } | |
1937 | ||
1938 | out: | |
1939 | if (primary_if) | |
82047ad7 | 1940 | batadv_hardif_put(primary_if); |
d56b1705 MH |
1941 | return 0; |
1942 | } | |
1943 | ||
1944 | /** | |
7e9a8c2c | 1945 | * batadv_nc_init_debugfs() - create nc folder and related files in debugfs |
d56b1705 MH |
1946 | * @bat_priv: the bat priv with all the soft interface information |
1947 | */ | |
3bcacd1e | 1948 | void batadv_nc_init_debugfs(struct batadv_priv *bat_priv) |
d56b1705 | 1949 | { |
3bcacd1e | 1950 | struct dentry *nc_dir; |
d56b1705 MH |
1951 | |
1952 | nc_dir = debugfs_create_dir("nc", bat_priv->debug_dir); | |
d56b1705 | 1953 | |
3bcacd1e | 1954 | debugfs_create_u8("min_tq", 0644, nc_dir, &bat_priv->nc.min_tq); |
d56b1705 | 1955 | |
3bcacd1e GKH |
1956 | debugfs_create_u32("max_fwd_delay", 0644, nc_dir, |
1957 | &bat_priv->nc.max_fwd_delay); | |
95332477 | 1958 | |
3bcacd1e GKH |
1959 | debugfs_create_u32("max_buffer_time", 0644, nc_dir, |
1960 | &bat_priv->nc.max_buffer_time); | |
d56b1705 | 1961 | } |
dc1cbd14 | 1962 | #endif |