1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* Copyright (C) B.A.T.M.A.N. contributors: |
3 | * |
4 | * Marek Lindner, Simon Wunderlich |
5 | */ |
6 | |
7 | #include "originator.h" |
8 | #include "main.h" |
9 | |
10 | #include <linux/atomic.h> |
11 | #include <linux/container_of.h> |
12 | #include <linux/errno.h> |
13 | #include <linux/etherdevice.h> |
14 | #include <linux/gfp.h> |
15 | #include <linux/jiffies.h> |
16 | #include <linux/kref.h> |
17 | #include <linux/list.h> |
18 | #include <linux/lockdep.h> |
19 | #include <linux/netdevice.h> |
20 | #include <linux/netlink.h> |
21 | #include <linux/rculist.h> |
22 | #include <linux/rcupdate.h> |
23 | #include <linux/skbuff.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/spinlock.h> |
26 | #include <linux/stddef.h> |
27 | #include <linux/workqueue.h> |
28 | #include <net/sock.h> |
29 | #include <uapi/linux/batadv_packet.h> |
30 | #include <uapi/linux/batman_adv.h> |
31 | |
32 | #include "bat_algo.h" |
33 | #include "distributed-arp-table.h" |
34 | #include "fragmentation.h" |
35 | #include "gateway_client.h" |
36 | #include "hard-interface.h" |
37 | #include "hash.h" |
38 | #include "log.h" |
39 | #include "multicast.h" |
40 | #include "netlink.h" |
41 | #include "network-coding.h" |
42 | #include "routing.h" |
43 | #include "soft-interface.h" |
44 | #include "translation-table.h" |
45 | |
46 | /* hash class keys */ |
47 | static struct lock_class_key batadv_orig_hash_lock_class_key; |
48 | |
49 | /** |
50 | * batadv_orig_hash_find() - Find and return originator from orig_hash |
51 | * @bat_priv: the bat priv with all the soft interface information |
52 | * @data: mac address of the originator |
53 | * |
54 | * Return: orig_node (with increased refcnt), NULL on errors |
55 | */ |
56 | struct batadv_orig_node * |
57 | batadv_orig_hash_find(struct batadv_priv *bat_priv, const void *data) |
58 | { |
59 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
60 | struct hlist_head *head; |
61 | struct batadv_orig_node *orig_node, *orig_node_tmp = NULL; |
62 | int index; |
63 | |
64 | if (!hash) |
65 | return NULL; |
66 | |
67 | index = batadv_choose_orig(data, size: hash->size); |
68 | head = &hash->table[index]; |
69 | |
70 | rcu_read_lock(); |
71 | hlist_for_each_entry_rcu(orig_node, head, hash_entry) { |
72 | if (!batadv_compare_eth(data1: orig_node, data2: data)) |
73 | continue; |
74 | |
75 | if (!kref_get_unless_zero(kref: &orig_node->refcount)) |
76 | continue; |
77 | |
78 | orig_node_tmp = orig_node; |
79 | break; |
80 | } |
81 | rcu_read_unlock(); |
82 | |
83 | return orig_node_tmp; |
84 | } |
85 | |
86 | static void batadv_purge_orig(struct work_struct *work); |
87 | |
88 | /** |
89 | * batadv_compare_orig() - comparing function used in the originator hash table |
90 | * @node: node in the local table |
91 | * @data2: second object to compare the node to |
92 | * |
93 | * Return: true if they are the same originator |
94 | */ |
95 | bool batadv_compare_orig(const struct hlist_node *node, const void *data2) |
96 | { |
97 | const void *data1 = container_of(node, struct batadv_orig_node, |
98 | hash_entry); |
99 | |
100 | return batadv_compare_eth(data1, data2); |
101 | } |
102 | |
103 | /** |
104 | * batadv_orig_node_vlan_get() - get an orig_node_vlan object |
105 | * @orig_node: the originator serving the VLAN |
106 | * @vid: the VLAN identifier |
107 | * |
108 | * Return: the vlan object identified by vid and belonging to orig_node or NULL |
109 | * if it does not exist. |
110 | */ |
111 | struct batadv_orig_node_vlan * |
112 | batadv_orig_node_vlan_get(struct batadv_orig_node *orig_node, |
113 | unsigned short vid) |
114 | { |
115 | struct batadv_orig_node_vlan *vlan = NULL, *tmp; |
116 | |
117 | rcu_read_lock(); |
118 | hlist_for_each_entry_rcu(tmp, &orig_node->vlan_list, list) { |
119 | if (tmp->vid != vid) |
120 | continue; |
121 | |
122 | if (!kref_get_unless_zero(kref: &tmp->refcount)) |
123 | continue; |
124 | |
125 | vlan = tmp; |
126 | |
127 | break; |
128 | } |
129 | rcu_read_unlock(); |
130 | |
131 | return vlan; |
132 | } |
133 | |
134 | /** |
135 | * batadv_orig_node_vlan_new() - search and possibly create an orig_node_vlan |
136 | * object |
137 | * @orig_node: the originator serving the VLAN |
138 | * @vid: the VLAN identifier |
139 | * |
140 | * Return: NULL in case of failure or the vlan object identified by vid and |
141 | * belonging to orig_node otherwise. The object is created and added to the list |
142 | * if it does not exist. |
143 | * |
144 | * The object is returned with refcounter increased by 1. |
145 | */ |
146 | struct batadv_orig_node_vlan * |
147 | batadv_orig_node_vlan_new(struct batadv_orig_node *orig_node, |
148 | unsigned short vid) |
149 | { |
150 | struct batadv_orig_node_vlan *vlan; |
151 | |
152 | spin_lock_bh(lock: &orig_node->vlan_list_lock); |
153 | |
154 | /* first look if an object for this vid already exists */ |
155 | vlan = batadv_orig_node_vlan_get(orig_node, vid); |
156 | if (vlan) |
157 | goto out; |
158 | |
159 | vlan = kzalloc(size: sizeof(*vlan), GFP_ATOMIC); |
160 | if (!vlan) |
161 | goto out; |
162 | |
163 | kref_init(kref: &vlan->refcount); |
164 | vlan->vid = vid; |
165 | |
166 | kref_get(kref: &vlan->refcount); |
167 | hlist_add_head_rcu(n: &vlan->list, h: &orig_node->vlan_list); |
168 | |
169 | out: |
170 | spin_unlock_bh(lock: &orig_node->vlan_list_lock); |
171 | |
172 | return vlan; |
173 | } |
174 | |
175 | /** |
176 | * batadv_orig_node_vlan_release() - release originator-vlan object from lists |
177 | * and queue for free after rcu grace period |
178 | * @ref: kref pointer of the originator-vlan object |
179 | */ |
180 | void batadv_orig_node_vlan_release(struct kref *ref) |
181 | { |
182 | struct batadv_orig_node_vlan *orig_vlan; |
183 | |
184 | orig_vlan = container_of(ref, struct batadv_orig_node_vlan, refcount); |
185 | |
186 | kfree_rcu(orig_vlan, rcu); |
187 | } |
188 | |
189 | /** |
190 | * batadv_originator_init() - Initialize all originator structures |
191 | * @bat_priv: the bat priv with all the soft interface information |
192 | * |
193 | * Return: 0 on success or negative error number in case of failure |
194 | */ |
195 | int batadv_originator_init(struct batadv_priv *bat_priv) |
196 | { |
197 | if (bat_priv->orig_hash) |
198 | return 0; |
199 | |
200 | bat_priv->orig_hash = batadv_hash_new(size: 1024); |
201 | |
202 | if (!bat_priv->orig_hash) |
203 | goto err; |
204 | |
205 | batadv_hash_set_lock_class(hash: bat_priv->orig_hash, |
206 | key: &batadv_orig_hash_lock_class_key); |
207 | |
208 | INIT_DELAYED_WORK(&bat_priv->orig_work, batadv_purge_orig); |
209 | queue_delayed_work(wq: batadv_event_workqueue, |
210 | dwork: &bat_priv->orig_work, |
211 | delay: msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); |
212 | |
213 | return 0; |
214 | |
215 | err: |
216 | return -ENOMEM; |
217 | } |
218 | |
219 | /** |
220 | * batadv_neigh_ifinfo_release() - release neigh_ifinfo from lists and queue for |
221 | * free after rcu grace period |
222 | * @ref: kref pointer of the neigh_ifinfo |
223 | */ |
224 | void batadv_neigh_ifinfo_release(struct kref *ref) |
225 | { |
226 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
227 | |
228 | neigh_ifinfo = container_of(ref, struct batadv_neigh_ifinfo, refcount); |
229 | |
230 | if (neigh_ifinfo->if_outgoing != BATADV_IF_DEFAULT) |
231 | batadv_hardif_put(hard_iface: neigh_ifinfo->if_outgoing); |
232 | |
233 | kfree_rcu(neigh_ifinfo, rcu); |
234 | } |
235 | |
236 | /** |
237 | * batadv_hardif_neigh_release() - release hardif neigh node from lists and |
238 | * queue for free after rcu grace period |
239 | * @ref: kref pointer of the neigh_node |
240 | */ |
241 | void batadv_hardif_neigh_release(struct kref *ref) |
242 | { |
243 | struct batadv_hardif_neigh_node *hardif_neigh; |
244 | |
245 | hardif_neigh = container_of(ref, struct batadv_hardif_neigh_node, |
246 | refcount); |
247 | |
248 | spin_lock_bh(lock: &hardif_neigh->if_incoming->neigh_list_lock); |
249 | hlist_del_init_rcu(n: &hardif_neigh->list); |
250 | spin_unlock_bh(lock: &hardif_neigh->if_incoming->neigh_list_lock); |
251 | |
252 | batadv_hardif_put(hard_iface: hardif_neigh->if_incoming); |
253 | kfree_rcu(hardif_neigh, rcu); |
254 | } |
255 | |
256 | /** |
257 | * batadv_neigh_node_release() - release neigh_node from lists and queue for |
258 | * free after rcu grace period |
259 | * @ref: kref pointer of the neigh_node |
260 | */ |
261 | void batadv_neigh_node_release(struct kref *ref) |
262 | { |
263 | struct hlist_node *node_tmp; |
264 | struct batadv_neigh_node *neigh_node; |
265 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
266 | |
267 | neigh_node = container_of(ref, struct batadv_neigh_node, refcount); |
268 | |
269 | hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, |
270 | &neigh_node->ifinfo_list, list) { |
271 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
272 | } |
273 | |
274 | batadv_hardif_neigh_put(hardif_neigh: neigh_node->hardif_neigh); |
275 | |
276 | batadv_hardif_put(hard_iface: neigh_node->if_incoming); |
277 | |
278 | kfree_rcu(neigh_node, rcu); |
279 | } |
280 | |
281 | /** |
282 | * batadv_orig_router_get() - router to the originator depending on iface |
283 | * @orig_node: the orig node for the router |
284 | * @if_outgoing: the interface where the payload packet has been received or |
285 | * the OGM should be sent to |
286 | * |
287 | * Return: the neighbor which should be the router for this orig_node/iface. |
288 | * |
289 | * The object is returned with refcounter increased by 1. |
290 | */ |
291 | struct batadv_neigh_node * |
292 | batadv_orig_router_get(struct batadv_orig_node *orig_node, |
293 | const struct batadv_hard_iface *if_outgoing) |
294 | { |
295 | struct batadv_orig_ifinfo *orig_ifinfo; |
296 | struct batadv_neigh_node *router = NULL; |
297 | |
298 | rcu_read_lock(); |
299 | hlist_for_each_entry_rcu(orig_ifinfo, &orig_node->ifinfo_list, list) { |
300 | if (orig_ifinfo->if_outgoing != if_outgoing) |
301 | continue; |
302 | |
303 | router = rcu_dereference(orig_ifinfo->router); |
304 | break; |
305 | } |
306 | |
307 | if (router && !kref_get_unless_zero(kref: &router->refcount)) |
308 | router = NULL; |
309 | |
310 | rcu_read_unlock(); |
311 | return router; |
312 | } |
313 | |
314 | /** |
315 | * batadv_orig_ifinfo_get() - find the ifinfo from an orig_node |
316 | * @orig_node: the orig node to be queried |
317 | * @if_outgoing: the interface for which the ifinfo should be acquired |
318 | * |
319 | * Return: the requested orig_ifinfo or NULL if not found. |
320 | * |
321 | * The object is returned with refcounter increased by 1. |
322 | */ |
323 | struct batadv_orig_ifinfo * |
324 | batadv_orig_ifinfo_get(struct batadv_orig_node *orig_node, |
325 | struct batadv_hard_iface *if_outgoing) |
326 | { |
327 | struct batadv_orig_ifinfo *tmp, *orig_ifinfo = NULL; |
328 | |
329 | rcu_read_lock(); |
330 | hlist_for_each_entry_rcu(tmp, &orig_node->ifinfo_list, |
331 | list) { |
332 | if (tmp->if_outgoing != if_outgoing) |
333 | continue; |
334 | |
335 | if (!kref_get_unless_zero(kref: &tmp->refcount)) |
336 | continue; |
337 | |
338 | orig_ifinfo = tmp; |
339 | break; |
340 | } |
341 | rcu_read_unlock(); |
342 | |
343 | return orig_ifinfo; |
344 | } |
345 | |
346 | /** |
347 | * batadv_orig_ifinfo_new() - search and possibly create an orig_ifinfo object |
348 | * @orig_node: the orig node to be queried |
349 | * @if_outgoing: the interface for which the ifinfo should be acquired |
350 | * |
351 | * Return: NULL in case of failure or the orig_ifinfo object for the if_outgoing |
352 | * interface otherwise. The object is created and added to the list |
353 | * if it does not exist. |
354 | * |
355 | * The object is returned with refcounter increased by 1. |
356 | */ |
357 | struct batadv_orig_ifinfo * |
358 | batadv_orig_ifinfo_new(struct batadv_orig_node *orig_node, |
359 | struct batadv_hard_iface *if_outgoing) |
360 | { |
361 | struct batadv_orig_ifinfo *orig_ifinfo; |
362 | unsigned long reset_time; |
363 | |
364 | spin_lock_bh(lock: &orig_node->neigh_list_lock); |
365 | |
366 | orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing); |
367 | if (orig_ifinfo) |
368 | goto out; |
369 | |
370 | orig_ifinfo = kzalloc(size: sizeof(*orig_ifinfo), GFP_ATOMIC); |
371 | if (!orig_ifinfo) |
372 | goto out; |
373 | |
374 | if (if_outgoing != BATADV_IF_DEFAULT) |
375 | kref_get(kref: &if_outgoing->refcount); |
376 | |
377 | reset_time = jiffies - 1; |
378 | reset_time -= msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); |
379 | orig_ifinfo->batman_seqno_reset = reset_time; |
380 | orig_ifinfo->if_outgoing = if_outgoing; |
381 | INIT_HLIST_NODE(h: &orig_ifinfo->list); |
382 | kref_init(kref: &orig_ifinfo->refcount); |
383 | |
384 | kref_get(kref: &orig_ifinfo->refcount); |
385 | hlist_add_head_rcu(n: &orig_ifinfo->list, |
386 | h: &orig_node->ifinfo_list); |
387 | out: |
388 | spin_unlock_bh(lock: &orig_node->neigh_list_lock); |
389 | return orig_ifinfo; |
390 | } |
391 | |
392 | /** |
393 | * batadv_neigh_ifinfo_get() - find the ifinfo from an neigh_node |
394 | * @neigh: the neigh node to be queried |
395 | * @if_outgoing: the interface for which the ifinfo should be acquired |
396 | * |
397 | * The object is returned with refcounter increased by 1. |
398 | * |
399 | * Return: the requested neigh_ifinfo or NULL if not found |
400 | */ |
401 | struct batadv_neigh_ifinfo * |
402 | batadv_neigh_ifinfo_get(struct batadv_neigh_node *neigh, |
403 | struct batadv_hard_iface *if_outgoing) |
404 | { |
405 | struct batadv_neigh_ifinfo *neigh_ifinfo = NULL, |
406 | *tmp_neigh_ifinfo; |
407 | |
408 | rcu_read_lock(); |
409 | hlist_for_each_entry_rcu(tmp_neigh_ifinfo, &neigh->ifinfo_list, |
410 | list) { |
411 | if (tmp_neigh_ifinfo->if_outgoing != if_outgoing) |
412 | continue; |
413 | |
414 | if (!kref_get_unless_zero(kref: &tmp_neigh_ifinfo->refcount)) |
415 | continue; |
416 | |
417 | neigh_ifinfo = tmp_neigh_ifinfo; |
418 | break; |
419 | } |
420 | rcu_read_unlock(); |
421 | |
422 | return neigh_ifinfo; |
423 | } |
424 | |
425 | /** |
426 | * batadv_neigh_ifinfo_new() - search and possibly create an neigh_ifinfo object |
427 | * @neigh: the neigh node to be queried |
428 | * @if_outgoing: the interface for which the ifinfo should be acquired |
429 | * |
430 | * Return: NULL in case of failure or the neigh_ifinfo object for the |
431 | * if_outgoing interface otherwise. The object is created and added to the list |
432 | * if it does not exist. |
433 | * |
434 | * The object is returned with refcounter increased by 1. |
435 | */ |
436 | struct batadv_neigh_ifinfo * |
437 | batadv_neigh_ifinfo_new(struct batadv_neigh_node *neigh, |
438 | struct batadv_hard_iface *if_outgoing) |
439 | { |
440 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
441 | |
442 | spin_lock_bh(lock: &neigh->ifinfo_lock); |
443 | |
444 | neigh_ifinfo = batadv_neigh_ifinfo_get(neigh, if_outgoing); |
445 | if (neigh_ifinfo) |
446 | goto out; |
447 | |
448 | neigh_ifinfo = kzalloc(size: sizeof(*neigh_ifinfo), GFP_ATOMIC); |
449 | if (!neigh_ifinfo) |
450 | goto out; |
451 | |
452 | if (if_outgoing) |
453 | kref_get(kref: &if_outgoing->refcount); |
454 | |
455 | INIT_HLIST_NODE(h: &neigh_ifinfo->list); |
456 | kref_init(kref: &neigh_ifinfo->refcount); |
457 | neigh_ifinfo->if_outgoing = if_outgoing; |
458 | |
459 | kref_get(kref: &neigh_ifinfo->refcount); |
460 | hlist_add_head_rcu(n: &neigh_ifinfo->list, h: &neigh->ifinfo_list); |
461 | |
462 | out: |
463 | spin_unlock_bh(lock: &neigh->ifinfo_lock); |
464 | |
465 | return neigh_ifinfo; |
466 | } |
467 | |
468 | /** |
469 | * batadv_neigh_node_get() - retrieve a neighbour from the list |
470 | * @orig_node: originator which the neighbour belongs to |
471 | * @hard_iface: the interface where this neighbour is connected to |
472 | * @addr: the address of the neighbour |
473 | * |
474 | * Looks for and possibly returns a neighbour belonging to this originator list |
475 | * which is connected through the provided hard interface. |
476 | * |
477 | * Return: neighbor when found. Otherwise NULL |
478 | */ |
479 | static struct batadv_neigh_node * |
480 | batadv_neigh_node_get(const struct batadv_orig_node *orig_node, |
481 | const struct batadv_hard_iface *hard_iface, |
482 | const u8 *addr) |
483 | { |
484 | struct batadv_neigh_node *tmp_neigh_node, *res = NULL; |
485 | |
486 | rcu_read_lock(); |
487 | hlist_for_each_entry_rcu(tmp_neigh_node, &orig_node->neigh_list, list) { |
488 | if (!batadv_compare_eth(data1: tmp_neigh_node->addr, data2: addr)) |
489 | continue; |
490 | |
491 | if (tmp_neigh_node->if_incoming != hard_iface) |
492 | continue; |
493 | |
494 | if (!kref_get_unless_zero(kref: &tmp_neigh_node->refcount)) |
495 | continue; |
496 | |
497 | res = tmp_neigh_node; |
498 | break; |
499 | } |
500 | rcu_read_unlock(); |
501 | |
502 | return res; |
503 | } |
504 | |
505 | /** |
506 | * batadv_hardif_neigh_create() - create a hardif neighbour node |
507 | * @hard_iface: the interface this neighbour is connected to |
508 | * @neigh_addr: the interface address of the neighbour to retrieve |
509 | * @orig_node: originator object representing the neighbour |
510 | * |
511 | * Return: the hardif neighbour node if found or created or NULL otherwise. |
512 | */ |
513 | static struct batadv_hardif_neigh_node * |
514 | batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface, |
515 | const u8 *neigh_addr, |
516 | struct batadv_orig_node *orig_node) |
517 | { |
518 | struct batadv_priv *bat_priv = netdev_priv(dev: hard_iface->soft_iface); |
519 | struct batadv_hardif_neigh_node *hardif_neigh; |
520 | |
521 | spin_lock_bh(lock: &hard_iface->neigh_list_lock); |
522 | |
523 | /* check if neighbor hasn't been added in the meantime */ |
524 | hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); |
525 | if (hardif_neigh) |
526 | goto out; |
527 | |
528 | hardif_neigh = kzalloc(size: sizeof(*hardif_neigh), GFP_ATOMIC); |
529 | if (!hardif_neigh) |
530 | goto out; |
531 | |
532 | kref_get(kref: &hard_iface->refcount); |
533 | INIT_HLIST_NODE(h: &hardif_neigh->list); |
534 | ether_addr_copy(dst: hardif_neigh->addr, src: neigh_addr); |
535 | ether_addr_copy(dst: hardif_neigh->orig, src: orig_node->orig); |
536 | hardif_neigh->if_incoming = hard_iface; |
537 | hardif_neigh->last_seen = jiffies; |
538 | |
539 | kref_init(kref: &hardif_neigh->refcount); |
540 | |
541 | if (bat_priv->algo_ops->neigh.hardif_init) |
542 | bat_priv->algo_ops->neigh.hardif_init(hardif_neigh); |
543 | |
544 | hlist_add_head_rcu(n: &hardif_neigh->list, h: &hard_iface->neigh_list); |
545 | |
546 | out: |
547 | spin_unlock_bh(lock: &hard_iface->neigh_list_lock); |
548 | return hardif_neigh; |
549 | } |
550 | |
551 | /** |
552 | * batadv_hardif_neigh_get_or_create() - retrieve or create a hardif neighbour |
553 | * node |
554 | * @hard_iface: the interface this neighbour is connected to |
555 | * @neigh_addr: the interface address of the neighbour to retrieve |
556 | * @orig_node: originator object representing the neighbour |
557 | * |
558 | * Return: the hardif neighbour node if found or created or NULL otherwise. |
559 | */ |
560 | static struct batadv_hardif_neigh_node * |
561 | batadv_hardif_neigh_get_or_create(struct batadv_hard_iface *hard_iface, |
562 | const u8 *neigh_addr, |
563 | struct batadv_orig_node *orig_node) |
564 | { |
565 | struct batadv_hardif_neigh_node *hardif_neigh; |
566 | |
567 | /* first check without locking to avoid the overhead */ |
568 | hardif_neigh = batadv_hardif_neigh_get(hard_iface, neigh_addr); |
569 | if (hardif_neigh) |
570 | return hardif_neigh; |
571 | |
572 | return batadv_hardif_neigh_create(hard_iface, neigh_addr, orig_node); |
573 | } |
574 | |
575 | /** |
576 | * batadv_hardif_neigh_get() - retrieve a hardif neighbour from the list |
577 | * @hard_iface: the interface where this neighbour is connected to |
578 | * @neigh_addr: the address of the neighbour |
579 | * |
580 | * Looks for and possibly returns a neighbour belonging to this hard interface. |
581 | * |
582 | * Return: neighbor when found. Otherwise NULL |
583 | */ |
584 | struct batadv_hardif_neigh_node * |
585 | batadv_hardif_neigh_get(const struct batadv_hard_iface *hard_iface, |
586 | const u8 *neigh_addr) |
587 | { |
588 | struct batadv_hardif_neigh_node *tmp_hardif_neigh, *hardif_neigh = NULL; |
589 | |
590 | rcu_read_lock(); |
591 | hlist_for_each_entry_rcu(tmp_hardif_neigh, |
592 | &hard_iface->neigh_list, list) { |
593 | if (!batadv_compare_eth(data1: tmp_hardif_neigh->addr, data2: neigh_addr)) |
594 | continue; |
595 | |
596 | if (!kref_get_unless_zero(kref: &tmp_hardif_neigh->refcount)) |
597 | continue; |
598 | |
599 | hardif_neigh = tmp_hardif_neigh; |
600 | break; |
601 | } |
602 | rcu_read_unlock(); |
603 | |
604 | return hardif_neigh; |
605 | } |
606 | |
607 | /** |
608 | * batadv_neigh_node_create() - create a neigh node object |
609 | * @orig_node: originator object representing the neighbour |
610 | * @hard_iface: the interface where the neighbour is connected to |
611 | * @neigh_addr: the mac address of the neighbour interface |
612 | * |
613 | * Allocates a new neigh_node object and initialises all the generic fields. |
614 | * |
615 | * Return: the neighbour node if found or created or NULL otherwise. |
616 | */ |
617 | static struct batadv_neigh_node * |
618 | batadv_neigh_node_create(struct batadv_orig_node *orig_node, |
619 | struct batadv_hard_iface *hard_iface, |
620 | const u8 *neigh_addr) |
621 | { |
622 | struct batadv_neigh_node *neigh_node; |
623 | struct batadv_hardif_neigh_node *hardif_neigh = NULL; |
624 | |
625 | spin_lock_bh(lock: &orig_node->neigh_list_lock); |
626 | |
627 | neigh_node = batadv_neigh_node_get(orig_node, hard_iface, addr: neigh_addr); |
628 | if (neigh_node) |
629 | goto out; |
630 | |
631 | hardif_neigh = batadv_hardif_neigh_get_or_create(hard_iface, |
632 | neigh_addr, orig_node); |
633 | if (!hardif_neigh) |
634 | goto out; |
635 | |
636 | neigh_node = kzalloc(size: sizeof(*neigh_node), GFP_ATOMIC); |
637 | if (!neigh_node) |
638 | goto out; |
639 | |
640 | INIT_HLIST_NODE(h: &neigh_node->list); |
641 | INIT_HLIST_HEAD(&neigh_node->ifinfo_list); |
642 | spin_lock_init(&neigh_node->ifinfo_lock); |
643 | |
644 | kref_get(kref: &hard_iface->refcount); |
645 | ether_addr_copy(dst: neigh_node->addr, src: neigh_addr); |
646 | neigh_node->if_incoming = hard_iface; |
647 | neigh_node->orig_node = orig_node; |
648 | neigh_node->last_seen = jiffies; |
649 | |
650 | /* increment unique neighbor refcount */ |
651 | kref_get(kref: &hardif_neigh->refcount); |
652 | neigh_node->hardif_neigh = hardif_neigh; |
653 | |
654 | /* extra reference for return */ |
655 | kref_init(kref: &neigh_node->refcount); |
656 | |
657 | kref_get(kref: &neigh_node->refcount); |
658 | hlist_add_head_rcu(n: &neigh_node->list, h: &orig_node->neigh_list); |
659 | |
660 | batadv_dbg(BATADV_DBG_BATMAN, orig_node->bat_priv, |
661 | "Creating new neighbor %pM for orig_node %pM on interface %s\n" , |
662 | neigh_addr, orig_node->orig, hard_iface->net_dev->name); |
663 | |
664 | out: |
665 | spin_unlock_bh(lock: &orig_node->neigh_list_lock); |
666 | |
667 | batadv_hardif_neigh_put(hardif_neigh); |
668 | return neigh_node; |
669 | } |
670 | |
671 | /** |
672 | * batadv_neigh_node_get_or_create() - retrieve or create a neigh node object |
673 | * @orig_node: originator object representing the neighbour |
674 | * @hard_iface: the interface where the neighbour is connected to |
675 | * @neigh_addr: the mac address of the neighbour interface |
676 | * |
677 | * Return: the neighbour node if found or created or NULL otherwise. |
678 | */ |
679 | struct batadv_neigh_node * |
680 | batadv_neigh_node_get_or_create(struct batadv_orig_node *orig_node, |
681 | struct batadv_hard_iface *hard_iface, |
682 | const u8 *neigh_addr) |
683 | { |
684 | struct batadv_neigh_node *neigh_node; |
685 | |
686 | /* first check without locking to avoid the overhead */ |
687 | neigh_node = batadv_neigh_node_get(orig_node, hard_iface, addr: neigh_addr); |
688 | if (neigh_node) |
689 | return neigh_node; |
690 | |
691 | return batadv_neigh_node_create(orig_node, hard_iface, neigh_addr); |
692 | } |
693 | |
694 | /** |
695 | * batadv_hardif_neigh_dump() - Dump to netlink the neighbor infos for a |
696 | * specific outgoing interface |
697 | * @msg: message to dump into |
698 | * @cb: parameters for the dump |
699 | * |
700 | * Return: 0 or error value |
701 | */ |
702 | int batadv_hardif_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb) |
703 | { |
704 | struct net *net = sock_net(sk: cb->skb->sk); |
705 | struct net_device *soft_iface; |
706 | struct net_device *hard_iface = NULL; |
707 | struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT; |
708 | struct batadv_priv *bat_priv; |
709 | struct batadv_hard_iface *primary_if = NULL; |
710 | int ret; |
711 | int ifindex, hard_ifindex; |
712 | |
713 | ifindex = batadv_netlink_get_ifindex(nlh: cb->nlh, attrtype: BATADV_ATTR_MESH_IFINDEX); |
714 | if (!ifindex) |
715 | return -EINVAL; |
716 | |
717 | soft_iface = dev_get_by_index(net, ifindex); |
718 | if (!soft_iface || !batadv_softif_is_valid(net_dev: soft_iface)) { |
719 | ret = -ENODEV; |
720 | goto out; |
721 | } |
722 | |
723 | bat_priv = netdev_priv(dev: soft_iface); |
724 | |
725 | primary_if = batadv_primary_if_get_selected(bat_priv); |
726 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
727 | ret = -ENOENT; |
728 | goto out; |
729 | } |
730 | |
731 | hard_ifindex = batadv_netlink_get_ifindex(nlh: cb->nlh, |
732 | attrtype: BATADV_ATTR_HARD_IFINDEX); |
733 | if (hard_ifindex) { |
734 | hard_iface = dev_get_by_index(net, ifindex: hard_ifindex); |
735 | if (hard_iface) |
736 | hardif = batadv_hardif_get_by_netdev(net_dev: hard_iface); |
737 | |
738 | if (!hardif) { |
739 | ret = -ENODEV; |
740 | goto out; |
741 | } |
742 | |
743 | if (hardif->soft_iface != soft_iface) { |
744 | ret = -ENOENT; |
745 | goto out; |
746 | } |
747 | } |
748 | |
749 | if (!bat_priv->algo_ops->neigh.dump) { |
750 | ret = -EOPNOTSUPP; |
751 | goto out; |
752 | } |
753 | |
754 | bat_priv->algo_ops->neigh.dump(msg, cb, bat_priv, hardif); |
755 | |
756 | ret = msg->len; |
757 | |
758 | out: |
759 | batadv_hardif_put(hard_iface: hardif); |
760 | dev_put(dev: hard_iface); |
761 | batadv_hardif_put(hard_iface: primary_if); |
762 | dev_put(dev: soft_iface); |
763 | |
764 | return ret; |
765 | } |
766 | |
767 | /** |
768 | * batadv_orig_ifinfo_release() - release orig_ifinfo from lists and queue for |
769 | * free after rcu grace period |
770 | * @ref: kref pointer of the orig_ifinfo |
771 | */ |
772 | void batadv_orig_ifinfo_release(struct kref *ref) |
773 | { |
774 | struct batadv_orig_ifinfo *orig_ifinfo; |
775 | struct batadv_neigh_node *router; |
776 | |
777 | orig_ifinfo = container_of(ref, struct batadv_orig_ifinfo, refcount); |
778 | |
779 | if (orig_ifinfo->if_outgoing != BATADV_IF_DEFAULT) |
780 | batadv_hardif_put(hard_iface: orig_ifinfo->if_outgoing); |
781 | |
782 | /* this is the last reference to this object */ |
783 | router = rcu_dereference_protected(orig_ifinfo->router, true); |
784 | batadv_neigh_node_put(neigh_node: router); |
785 | |
786 | kfree_rcu(orig_ifinfo, rcu); |
787 | } |
788 | |
789 | /** |
790 | * batadv_orig_node_free_rcu() - free the orig_node |
791 | * @rcu: rcu pointer of the orig_node |
792 | */ |
793 | static void batadv_orig_node_free_rcu(struct rcu_head *rcu) |
794 | { |
795 | struct batadv_orig_node *orig_node; |
796 | |
797 | orig_node = container_of(rcu, struct batadv_orig_node, rcu); |
798 | |
799 | batadv_mcast_purge_orig(orig_node); |
800 | |
801 | batadv_frag_purge_orig(orig: orig_node, NULL); |
802 | |
803 | kfree(objp: orig_node->tt_buff); |
804 | kfree(objp: orig_node); |
805 | } |
806 | |
807 | /** |
808 | * batadv_orig_node_release() - release orig_node from lists and queue for |
809 | * free after rcu grace period |
810 | * @ref: kref pointer of the orig_node |
811 | */ |
812 | void batadv_orig_node_release(struct kref *ref) |
813 | { |
814 | struct hlist_node *node_tmp; |
815 | struct batadv_neigh_node *neigh_node; |
816 | struct batadv_orig_node *orig_node; |
817 | struct batadv_orig_ifinfo *orig_ifinfo; |
818 | struct batadv_orig_node_vlan *vlan; |
819 | struct batadv_orig_ifinfo *last_candidate; |
820 | |
821 | orig_node = container_of(ref, struct batadv_orig_node, refcount); |
822 | |
823 | spin_lock_bh(lock: &orig_node->neigh_list_lock); |
824 | |
825 | /* for all neighbors towards this originator ... */ |
826 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
827 | &orig_node->neigh_list, list) { |
828 | hlist_del_rcu(n: &neigh_node->list); |
829 | batadv_neigh_node_put(neigh_node); |
830 | } |
831 | |
832 | hlist_for_each_entry_safe(orig_ifinfo, node_tmp, |
833 | &orig_node->ifinfo_list, list) { |
834 | hlist_del_rcu(n: &orig_ifinfo->list); |
835 | batadv_orig_ifinfo_put(orig_ifinfo); |
836 | } |
837 | |
838 | last_candidate = orig_node->last_bonding_candidate; |
839 | orig_node->last_bonding_candidate = NULL; |
840 | spin_unlock_bh(lock: &orig_node->neigh_list_lock); |
841 | |
842 | batadv_orig_ifinfo_put(orig_ifinfo: last_candidate); |
843 | |
844 | spin_lock_bh(lock: &orig_node->vlan_list_lock); |
845 | hlist_for_each_entry_safe(vlan, node_tmp, &orig_node->vlan_list, list) { |
846 | hlist_del_rcu(n: &vlan->list); |
847 | batadv_orig_node_vlan_put(orig_vlan: vlan); |
848 | } |
849 | spin_unlock_bh(lock: &orig_node->vlan_list_lock); |
850 | |
851 | /* Free nc_nodes */ |
852 | batadv_nc_purge_orig(bat_priv: orig_node->bat_priv, orig_node, NULL); |
853 | |
854 | call_rcu(head: &orig_node->rcu, func: batadv_orig_node_free_rcu); |
855 | } |
856 | |
857 | /** |
858 | * batadv_originator_free() - Free all originator structures |
859 | * @bat_priv: the bat priv with all the soft interface information |
860 | */ |
861 | void batadv_originator_free(struct batadv_priv *bat_priv) |
862 | { |
863 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
864 | struct hlist_node *node_tmp; |
865 | struct hlist_head *head; |
866 | spinlock_t *list_lock; /* spinlock to protect write access */ |
867 | struct batadv_orig_node *orig_node; |
868 | u32 i; |
869 | |
870 | if (!hash) |
871 | return; |
872 | |
873 | cancel_delayed_work_sync(dwork: &bat_priv->orig_work); |
874 | |
875 | bat_priv->orig_hash = NULL; |
876 | |
877 | for (i = 0; i < hash->size; i++) { |
878 | head = &hash->table[i]; |
879 | list_lock = &hash->list_locks[i]; |
880 | |
881 | spin_lock_bh(lock: list_lock); |
882 | hlist_for_each_entry_safe(orig_node, node_tmp, |
883 | head, hash_entry) { |
884 | hlist_del_rcu(n: &orig_node->hash_entry); |
885 | batadv_orig_node_put(orig_node); |
886 | } |
887 | spin_unlock_bh(lock: list_lock); |
888 | } |
889 | |
890 | batadv_hash_destroy(hash); |
891 | } |
892 | |
893 | /** |
894 | * batadv_orig_node_new() - creates a new orig_node |
895 | * @bat_priv: the bat priv with all the soft interface information |
896 | * @addr: the mac address of the originator |
897 | * |
898 | * Creates a new originator object and initialises all the generic fields. |
899 | * The new object is not added to the originator list. |
900 | * |
901 | * Return: the newly created object or NULL on failure. |
902 | */ |
903 | struct batadv_orig_node *batadv_orig_node_new(struct batadv_priv *bat_priv, |
904 | const u8 *addr) |
905 | { |
906 | struct batadv_orig_node *orig_node; |
907 | struct batadv_orig_node_vlan *vlan; |
908 | unsigned long reset_time; |
909 | int i; |
910 | |
911 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
912 | "Creating new originator: %pM\n" , addr); |
913 | |
914 | orig_node = kzalloc(size: sizeof(*orig_node), GFP_ATOMIC); |
915 | if (!orig_node) |
916 | return NULL; |
917 | |
918 | INIT_HLIST_HEAD(&orig_node->neigh_list); |
919 | INIT_HLIST_HEAD(&orig_node->vlan_list); |
920 | INIT_HLIST_HEAD(&orig_node->ifinfo_list); |
921 | spin_lock_init(&orig_node->bcast_seqno_lock); |
922 | spin_lock_init(&orig_node->neigh_list_lock); |
923 | spin_lock_init(&orig_node->tt_buff_lock); |
924 | spin_lock_init(&orig_node->tt_lock); |
925 | spin_lock_init(&orig_node->vlan_list_lock); |
926 | |
927 | batadv_nc_init_orig(orig_node); |
928 | |
929 | /* extra reference for return */ |
930 | kref_init(kref: &orig_node->refcount); |
931 | |
932 | orig_node->bat_priv = bat_priv; |
933 | ether_addr_copy(dst: orig_node->orig, src: addr); |
934 | batadv_dat_init_orig_node_addr(orig_node); |
935 | atomic_set(v: &orig_node->last_ttvn, i: 0); |
936 | orig_node->tt_buff = NULL; |
937 | orig_node->tt_buff_len = 0; |
938 | orig_node->last_seen = jiffies; |
939 | reset_time = jiffies - 1 - msecs_to_jiffies(BATADV_RESET_PROTECTION_MS); |
940 | orig_node->bcast_seqno_reset = reset_time; |
941 | |
942 | #ifdef CONFIG_BATMAN_ADV_MCAST |
943 | orig_node->mcast_flags = BATADV_MCAST_WANT_NO_RTR4; |
944 | orig_node->mcast_flags |= BATADV_MCAST_WANT_NO_RTR6; |
945 | INIT_HLIST_NODE(h: &orig_node->mcast_want_all_unsnoopables_node); |
946 | INIT_HLIST_NODE(h: &orig_node->mcast_want_all_ipv4_node); |
947 | INIT_HLIST_NODE(h: &orig_node->mcast_want_all_ipv6_node); |
948 | spin_lock_init(&orig_node->mcast_handler_lock); |
949 | #endif |
950 | |
951 | /* create a vlan object for the "untagged" LAN */ |
952 | vlan = batadv_orig_node_vlan_new(orig_node, BATADV_NO_FLAGS); |
953 | if (!vlan) |
954 | goto free_orig_node; |
955 | /* batadv_orig_node_vlan_new() increases the refcounter. |
956 | * Immediately release vlan since it is not needed anymore in this |
957 | * context |
958 | */ |
959 | batadv_orig_node_vlan_put(orig_vlan: vlan); |
960 | |
961 | for (i = 0; i < BATADV_FRAG_BUFFER_COUNT; i++) { |
962 | INIT_HLIST_HEAD(&orig_node->fragments[i].fragment_list); |
963 | spin_lock_init(&orig_node->fragments[i].lock); |
964 | orig_node->fragments[i].size = 0; |
965 | } |
966 | |
967 | return orig_node; |
968 | free_orig_node: |
969 | kfree(objp: orig_node); |
970 | return NULL; |
971 | } |
972 | |
973 | /** |
974 | * batadv_purge_neigh_ifinfo() - purge obsolete ifinfo entries from neighbor |
975 | * @bat_priv: the bat priv with all the soft interface information |
976 | * @neigh: orig node which is to be checked |
977 | */ |
978 | static void |
979 | batadv_purge_neigh_ifinfo(struct batadv_priv *bat_priv, |
980 | struct batadv_neigh_node *neigh) |
981 | { |
982 | struct batadv_neigh_ifinfo *neigh_ifinfo; |
983 | struct batadv_hard_iface *if_outgoing; |
984 | struct hlist_node *node_tmp; |
985 | |
986 | spin_lock_bh(lock: &neigh->ifinfo_lock); |
987 | |
988 | /* for all ifinfo objects for this neighinator */ |
989 | hlist_for_each_entry_safe(neigh_ifinfo, node_tmp, |
990 | &neigh->ifinfo_list, list) { |
991 | if_outgoing = neigh_ifinfo->if_outgoing; |
992 | |
993 | /* always keep the default interface */ |
994 | if (if_outgoing == BATADV_IF_DEFAULT) |
995 | continue; |
996 | |
997 | /* don't purge if the interface is not (going) down */ |
998 | if (if_outgoing->if_status != BATADV_IF_INACTIVE && |
999 | if_outgoing->if_status != BATADV_IF_NOT_IN_USE && |
1000 | if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED) |
1001 | continue; |
1002 | |
1003 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1004 | "neighbor/ifinfo purge: neighbor %pM, iface: %s\n" , |
1005 | neigh->addr, if_outgoing->net_dev->name); |
1006 | |
1007 | hlist_del_rcu(n: &neigh_ifinfo->list); |
1008 | batadv_neigh_ifinfo_put(neigh_ifinfo); |
1009 | } |
1010 | |
1011 | spin_unlock_bh(lock: &neigh->ifinfo_lock); |
1012 | } |
1013 | |
1014 | /** |
1015 | * batadv_purge_orig_ifinfo() - purge obsolete ifinfo entries from originator |
1016 | * @bat_priv: the bat priv with all the soft interface information |
1017 | * @orig_node: orig node which is to be checked |
1018 | * |
1019 | * Return: true if any ifinfo entry was purged, false otherwise. |
1020 | */ |
1021 | static bool |
1022 | batadv_purge_orig_ifinfo(struct batadv_priv *bat_priv, |
1023 | struct batadv_orig_node *orig_node) |
1024 | { |
1025 | struct batadv_orig_ifinfo *orig_ifinfo; |
1026 | struct batadv_hard_iface *if_outgoing; |
1027 | struct hlist_node *node_tmp; |
1028 | bool ifinfo_purged = false; |
1029 | |
1030 | spin_lock_bh(lock: &orig_node->neigh_list_lock); |
1031 | |
1032 | /* for all ifinfo objects for this originator */ |
1033 | hlist_for_each_entry_safe(orig_ifinfo, node_tmp, |
1034 | &orig_node->ifinfo_list, list) { |
1035 | if_outgoing = orig_ifinfo->if_outgoing; |
1036 | |
1037 | /* always keep the default interface */ |
1038 | if (if_outgoing == BATADV_IF_DEFAULT) |
1039 | continue; |
1040 | |
1041 | /* don't purge if the interface is not (going) down */ |
1042 | if (if_outgoing->if_status != BATADV_IF_INACTIVE && |
1043 | if_outgoing->if_status != BATADV_IF_NOT_IN_USE && |
1044 | if_outgoing->if_status != BATADV_IF_TO_BE_REMOVED) |
1045 | continue; |
1046 | |
1047 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1048 | "router/ifinfo purge: originator %pM, iface: %s\n" , |
1049 | orig_node->orig, if_outgoing->net_dev->name); |
1050 | |
1051 | ifinfo_purged = true; |
1052 | |
1053 | hlist_del_rcu(n: &orig_ifinfo->list); |
1054 | batadv_orig_ifinfo_put(orig_ifinfo); |
1055 | if (orig_node->last_bonding_candidate == orig_ifinfo) { |
1056 | orig_node->last_bonding_candidate = NULL; |
1057 | batadv_orig_ifinfo_put(orig_ifinfo); |
1058 | } |
1059 | } |
1060 | |
1061 | spin_unlock_bh(lock: &orig_node->neigh_list_lock); |
1062 | |
1063 | return ifinfo_purged; |
1064 | } |
1065 | |
1066 | /** |
1067 | * batadv_purge_orig_neighbors() - purges neighbors from originator |
1068 | * @bat_priv: the bat priv with all the soft interface information |
1069 | * @orig_node: orig node which is to be checked |
1070 | * |
1071 | * Return: true if any neighbor was purged, false otherwise |
1072 | */ |
1073 | static bool |
1074 | batadv_purge_orig_neighbors(struct batadv_priv *bat_priv, |
1075 | struct batadv_orig_node *orig_node) |
1076 | { |
1077 | struct hlist_node *node_tmp; |
1078 | struct batadv_neigh_node *neigh_node; |
1079 | bool neigh_purged = false; |
1080 | unsigned long last_seen; |
1081 | struct batadv_hard_iface *if_incoming; |
1082 | |
1083 | spin_lock_bh(lock: &orig_node->neigh_list_lock); |
1084 | |
1085 | /* for all neighbors towards this originator ... */ |
1086 | hlist_for_each_entry_safe(neigh_node, node_tmp, |
1087 | &orig_node->neigh_list, list) { |
1088 | last_seen = neigh_node->last_seen; |
1089 | if_incoming = neigh_node->if_incoming; |
1090 | |
1091 | if (batadv_has_timed_out(timestamp: last_seen, BATADV_PURGE_TIMEOUT) || |
1092 | if_incoming->if_status == BATADV_IF_INACTIVE || |
1093 | if_incoming->if_status == BATADV_IF_NOT_IN_USE || |
1094 | if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) { |
1095 | if (if_incoming->if_status == BATADV_IF_INACTIVE || |
1096 | if_incoming->if_status == BATADV_IF_NOT_IN_USE || |
1097 | if_incoming->if_status == BATADV_IF_TO_BE_REMOVED) |
1098 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1099 | "neighbor purge: originator %pM, neighbor: %pM, iface: %s\n" , |
1100 | orig_node->orig, neigh_node->addr, |
1101 | if_incoming->net_dev->name); |
1102 | else |
1103 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1104 | "neighbor timeout: originator %pM, neighbor: %pM, last_seen: %u\n" , |
1105 | orig_node->orig, neigh_node->addr, |
1106 | jiffies_to_msecs(last_seen)); |
1107 | |
1108 | neigh_purged = true; |
1109 | |
1110 | hlist_del_rcu(n: &neigh_node->list); |
1111 | batadv_neigh_node_put(neigh_node); |
1112 | } else { |
1113 | /* only necessary if not the whole neighbor is to be |
1114 | * deleted, but some interface has been removed. |
1115 | */ |
1116 | batadv_purge_neigh_ifinfo(bat_priv, neigh: neigh_node); |
1117 | } |
1118 | } |
1119 | |
1120 | spin_unlock_bh(lock: &orig_node->neigh_list_lock); |
1121 | return neigh_purged; |
1122 | } |
1123 | |
1124 | /** |
1125 | * batadv_find_best_neighbor() - finds the best neighbor after purging |
1126 | * @bat_priv: the bat priv with all the soft interface information |
1127 | * @orig_node: orig node which is to be checked |
1128 | * @if_outgoing: the interface for which the metric should be compared |
1129 | * |
1130 | * Return: the current best neighbor, with refcount increased. |
1131 | */ |
1132 | static struct batadv_neigh_node * |
1133 | batadv_find_best_neighbor(struct batadv_priv *bat_priv, |
1134 | struct batadv_orig_node *orig_node, |
1135 | struct batadv_hard_iface *if_outgoing) |
1136 | { |
1137 | struct batadv_neigh_node *best = NULL, *neigh; |
1138 | struct batadv_algo_ops *bao = bat_priv->algo_ops; |
1139 | |
1140 | rcu_read_lock(); |
1141 | hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) { |
1142 | if (best && (bao->neigh.cmp(neigh, if_outgoing, best, |
1143 | if_outgoing) <= 0)) |
1144 | continue; |
1145 | |
1146 | if (!kref_get_unless_zero(kref: &neigh->refcount)) |
1147 | continue; |
1148 | |
1149 | batadv_neigh_node_put(neigh_node: best); |
1150 | |
1151 | best = neigh; |
1152 | } |
1153 | rcu_read_unlock(); |
1154 | |
1155 | return best; |
1156 | } |
1157 | |
1158 | /** |
1159 | * batadv_purge_orig_node() - purges obsolete information from an orig_node |
1160 | * @bat_priv: the bat priv with all the soft interface information |
1161 | * @orig_node: orig node which is to be checked |
1162 | * |
1163 | * This function checks if the orig_node or substructures of it have become |
1164 | * obsolete, and purges this information if that's the case. |
1165 | * |
1166 | * Return: true if the orig_node is to be removed, false otherwise. |
1167 | */ |
1168 | static bool batadv_purge_orig_node(struct batadv_priv *bat_priv, |
1169 | struct batadv_orig_node *orig_node) |
1170 | { |
1171 | struct batadv_neigh_node *best_neigh_node; |
1172 | struct batadv_hard_iface *hard_iface; |
1173 | bool changed_ifinfo, changed_neigh; |
1174 | |
1175 | if (batadv_has_timed_out(timestamp: orig_node->last_seen, |
1176 | timeout: 2 * BATADV_PURGE_TIMEOUT)) { |
1177 | batadv_dbg(BATADV_DBG_BATMAN, bat_priv, |
1178 | "Originator timeout: originator %pM, last_seen %u\n" , |
1179 | orig_node->orig, |
1180 | jiffies_to_msecs(orig_node->last_seen)); |
1181 | return true; |
1182 | } |
1183 | changed_ifinfo = batadv_purge_orig_ifinfo(bat_priv, orig_node); |
1184 | changed_neigh = batadv_purge_orig_neighbors(bat_priv, orig_node); |
1185 | |
1186 | if (!changed_ifinfo && !changed_neigh) |
1187 | return false; |
1188 | |
1189 | /* first for NULL ... */ |
1190 | best_neigh_node = batadv_find_best_neighbor(bat_priv, orig_node, |
1191 | BATADV_IF_DEFAULT); |
1192 | batadv_update_route(bat_priv, orig_node, BATADV_IF_DEFAULT, |
1193 | neigh_node: best_neigh_node); |
1194 | batadv_neigh_node_put(neigh_node: best_neigh_node); |
1195 | |
1196 | /* ... then for all other interfaces. */ |
1197 | rcu_read_lock(); |
1198 | list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) { |
1199 | if (hard_iface->if_status != BATADV_IF_ACTIVE) |
1200 | continue; |
1201 | |
1202 | if (hard_iface->soft_iface != bat_priv->soft_iface) |
1203 | continue; |
1204 | |
1205 | if (!kref_get_unless_zero(kref: &hard_iface->refcount)) |
1206 | continue; |
1207 | |
1208 | best_neigh_node = batadv_find_best_neighbor(bat_priv, |
1209 | orig_node, |
1210 | if_outgoing: hard_iface); |
1211 | batadv_update_route(bat_priv, orig_node, recv_if: hard_iface, |
1212 | neigh_node: best_neigh_node); |
1213 | batadv_neigh_node_put(neigh_node: best_neigh_node); |
1214 | |
1215 | batadv_hardif_put(hard_iface); |
1216 | } |
1217 | rcu_read_unlock(); |
1218 | |
1219 | return false; |
1220 | } |
1221 | |
1222 | /** |
1223 | * batadv_purge_orig_ref() - Purge all outdated originators |
1224 | * @bat_priv: the bat priv with all the soft interface information |
1225 | */ |
1226 | void batadv_purge_orig_ref(struct batadv_priv *bat_priv) |
1227 | { |
1228 | struct batadv_hashtable *hash = bat_priv->orig_hash; |
1229 | struct hlist_node *node_tmp; |
1230 | struct hlist_head *head; |
1231 | spinlock_t *list_lock; /* spinlock to protect write access */ |
1232 | struct batadv_orig_node *orig_node; |
1233 | u32 i; |
1234 | |
1235 | if (!hash) |
1236 | return; |
1237 | |
1238 | /* for all origins... */ |
1239 | for (i = 0; i < hash->size; i++) { |
1240 | head = &hash->table[i]; |
1241 | list_lock = &hash->list_locks[i]; |
1242 | |
1243 | spin_lock_bh(lock: list_lock); |
1244 | hlist_for_each_entry_safe(orig_node, node_tmp, |
1245 | head, hash_entry) { |
1246 | if (batadv_purge_orig_node(bat_priv, orig_node)) { |
1247 | batadv_gw_node_delete(bat_priv, orig_node); |
1248 | hlist_del_rcu(n: &orig_node->hash_entry); |
1249 | batadv_tt_global_del_orig(bat_priv: orig_node->bat_priv, |
1250 | orig_node, match_vid: -1, |
1251 | message: "originator timed out" ); |
1252 | batadv_orig_node_put(orig_node); |
1253 | continue; |
1254 | } |
1255 | |
1256 | batadv_frag_purge_orig(orig: orig_node, |
1257 | check_cb: batadv_frag_check_entry); |
1258 | } |
1259 | spin_unlock_bh(lock: list_lock); |
1260 | } |
1261 | |
1262 | batadv_gw_election(bat_priv); |
1263 | } |
1264 | |
1265 | static void batadv_purge_orig(struct work_struct *work) |
1266 | { |
1267 | struct delayed_work *delayed_work; |
1268 | struct batadv_priv *bat_priv; |
1269 | |
1270 | delayed_work = to_delayed_work(work); |
1271 | bat_priv = container_of(delayed_work, struct batadv_priv, orig_work); |
1272 | batadv_purge_orig_ref(bat_priv); |
1273 | queue_delayed_work(wq: batadv_event_workqueue, |
1274 | dwork: &bat_priv->orig_work, |
1275 | delay: msecs_to_jiffies(BATADV_ORIG_WORK_PERIOD)); |
1276 | } |
1277 | |
1278 | /** |
1279 | * batadv_orig_dump() - Dump to netlink the originator infos for a specific |
1280 | * outgoing interface |
1281 | * @msg: message to dump into |
1282 | * @cb: parameters for the dump |
1283 | * |
1284 | * Return: 0 or error value |
1285 | */ |
1286 | int batadv_orig_dump(struct sk_buff *msg, struct netlink_callback *cb) |
1287 | { |
1288 | struct net *net = sock_net(sk: cb->skb->sk); |
1289 | struct net_device *soft_iface; |
1290 | struct net_device *hard_iface = NULL; |
1291 | struct batadv_hard_iface *hardif = BATADV_IF_DEFAULT; |
1292 | struct batadv_priv *bat_priv; |
1293 | struct batadv_hard_iface *primary_if = NULL; |
1294 | int ret; |
1295 | int ifindex, hard_ifindex; |
1296 | |
1297 | ifindex = batadv_netlink_get_ifindex(nlh: cb->nlh, attrtype: BATADV_ATTR_MESH_IFINDEX); |
1298 | if (!ifindex) |
1299 | return -EINVAL; |
1300 | |
1301 | soft_iface = dev_get_by_index(net, ifindex); |
1302 | if (!soft_iface || !batadv_softif_is_valid(net_dev: soft_iface)) { |
1303 | ret = -ENODEV; |
1304 | goto out; |
1305 | } |
1306 | |
1307 | bat_priv = netdev_priv(dev: soft_iface); |
1308 | |
1309 | primary_if = batadv_primary_if_get_selected(bat_priv); |
1310 | if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) { |
1311 | ret = -ENOENT; |
1312 | goto out; |
1313 | } |
1314 | |
1315 | hard_ifindex = batadv_netlink_get_ifindex(nlh: cb->nlh, |
1316 | attrtype: BATADV_ATTR_HARD_IFINDEX); |
1317 | if (hard_ifindex) { |
1318 | hard_iface = dev_get_by_index(net, ifindex: hard_ifindex); |
1319 | if (hard_iface) |
1320 | hardif = batadv_hardif_get_by_netdev(net_dev: hard_iface); |
1321 | |
1322 | if (!hardif) { |
1323 | ret = -ENODEV; |
1324 | goto out; |
1325 | } |
1326 | |
1327 | if (hardif->soft_iface != soft_iface) { |
1328 | ret = -ENOENT; |
1329 | goto out; |
1330 | } |
1331 | } |
1332 | |
1333 | if (!bat_priv->algo_ops->orig.dump) { |
1334 | ret = -EOPNOTSUPP; |
1335 | goto out; |
1336 | } |
1337 | |
1338 | bat_priv->algo_ops->orig.dump(msg, cb, bat_priv, hardif); |
1339 | |
1340 | ret = msg->len; |
1341 | |
1342 | out: |
1343 | batadv_hardif_put(hard_iface: hardif); |
1344 | dev_put(dev: hard_iface); |
1345 | batadv_hardif_put(hard_iface: primary_if); |
1346 | dev_put(dev: soft_iface); |
1347 | |
1348 | return ret; |
1349 | } |
1350 | |