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batman-adv: don't bother flipping ->tt_data
[mirror_ubuntu-artful-kernel.git] / net / batman-adv / translation-table.c
1 /*
2 * Copyright (C) 2007-2012 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich, Antonio Quartulli
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22 #include "main.h"
23 #include "translation-table.h"
24 #include "soft-interface.h"
25 #include "hard-interface.h"
26 #include "send.h"
27 #include "hash.h"
28 #include "originator.h"
29 #include "routing.h"
30 #include "bridge_loop_avoidance.h"
31
32 #include <linux/crc16.h>
33
34 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
35 struct orig_node *orig_node);
36 static void tt_purge(struct work_struct *work);
37 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry);
38
39 /* returns 1 if they are the same mac addr */
40 static int compare_tt(const struct hlist_node *node, const void *data2)
41 {
42 const void *data1 = container_of(node, struct tt_common_entry,
43 hash_entry);
44
45 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
46 }
47
48 static void tt_start_timer(struct bat_priv *bat_priv)
49 {
50 INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
51 queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
52 msecs_to_jiffies(5000));
53 }
54
55 static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash,
56 const void *data)
57 {
58 struct hlist_head *head;
59 struct hlist_node *node;
60 struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
61 uint32_t index;
62
63 if (!hash)
64 return NULL;
65
66 index = choose_orig(data, hash->size);
67 head = &hash->table[index];
68
69 rcu_read_lock();
70 hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
71 if (!compare_eth(tt_common_entry, data))
72 continue;
73
74 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
75 continue;
76
77 tt_common_entry_tmp = tt_common_entry;
78 break;
79 }
80 rcu_read_unlock();
81
82 return tt_common_entry_tmp;
83 }
84
85 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
86 const void *data)
87 {
88 struct tt_common_entry *tt_common_entry;
89 struct tt_local_entry *tt_local_entry = NULL;
90
91 tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data);
92 if (tt_common_entry)
93 tt_local_entry = container_of(tt_common_entry,
94 struct tt_local_entry, common);
95 return tt_local_entry;
96 }
97
98 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
99 const void *data)
100 {
101 struct tt_common_entry *tt_common_entry;
102 struct tt_global_entry *tt_global_entry = NULL;
103
104 tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data);
105 if (tt_common_entry)
106 tt_global_entry = container_of(tt_common_entry,
107 struct tt_global_entry, common);
108 return tt_global_entry;
109
110 }
111
112 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
113 {
114 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
115 kfree_rcu(tt_local_entry, common.rcu);
116 }
117
118 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
119 {
120 struct tt_common_entry *tt_common_entry;
121 struct tt_global_entry *tt_global_entry;
122
123 tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
124 tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
125 common);
126
127 kfree(tt_global_entry);
128 }
129
130 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
131 {
132 if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
133 tt_global_del_orig_list(tt_global_entry);
134 call_rcu(&tt_global_entry->common.rcu,
135 tt_global_entry_free_rcu);
136 }
137 }
138
139 static void tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
140 {
141 struct tt_orig_list_entry *orig_entry;
142
143 orig_entry = container_of(rcu, struct tt_orig_list_entry, rcu);
144 atomic_dec(&orig_entry->orig_node->tt_size);
145 orig_node_free_ref(orig_entry->orig_node);
146 kfree(orig_entry);
147 }
148
149 static void tt_orig_list_entry_free_ref(struct tt_orig_list_entry *orig_entry)
150 {
151 call_rcu(&orig_entry->rcu, tt_orig_list_entry_free_rcu);
152 }
153
154 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
155 uint8_t flags)
156 {
157 struct tt_change_node *tt_change_node;
158
159 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
160
161 if (!tt_change_node)
162 return;
163
164 tt_change_node->change.flags = flags;
165 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
166
167 spin_lock_bh(&bat_priv->tt_changes_list_lock);
168 /* track the change in the OGMinterval list */
169 list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
170 atomic_inc(&bat_priv->tt_local_changes);
171 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
172
173 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
174 }
175
176 int tt_len(int changes_num)
177 {
178 return changes_num * sizeof(struct tt_change);
179 }
180
181 static int tt_local_init(struct bat_priv *bat_priv)
182 {
183 if (bat_priv->tt_local_hash)
184 return 0;
185
186 bat_priv->tt_local_hash = hash_new(1024);
187
188 if (!bat_priv->tt_local_hash)
189 return -ENOMEM;
190
191 return 0;
192 }
193
194 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
195 int ifindex)
196 {
197 struct bat_priv *bat_priv = netdev_priv(soft_iface);
198 struct tt_local_entry *tt_local_entry = NULL;
199 struct tt_global_entry *tt_global_entry = NULL;
200 struct hlist_head *head;
201 struct hlist_node *node;
202 struct tt_orig_list_entry *orig_entry;
203 int hash_added;
204
205 tt_local_entry = tt_local_hash_find(bat_priv, addr);
206
207 if (tt_local_entry) {
208 tt_local_entry->last_seen = jiffies;
209 /* possibly unset the TT_CLIENT_PENDING flag */
210 tt_local_entry->common.flags &= ~TT_CLIENT_PENDING;
211 goto out;
212 }
213
214 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
215 if (!tt_local_entry)
216 goto out;
217
218 bat_dbg(DBG_TT, bat_priv,
219 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
220 (uint8_t)atomic_read(&bat_priv->ttvn));
221
222 memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
223 tt_local_entry->common.flags = NO_FLAGS;
224 if (is_wifi_iface(ifindex))
225 tt_local_entry->common.flags |= TT_CLIENT_WIFI;
226 atomic_set(&tt_local_entry->common.refcount, 2);
227 tt_local_entry->last_seen = jiffies;
228
229 /* the batman interface mac address should never be purged */
230 if (compare_eth(addr, soft_iface->dev_addr))
231 tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
232
233 /* The local entry has to be marked as NEW to avoid to send it in
234 * a full table response going out before the next ttvn increment
235 * (consistency check) */
236 tt_local_entry->common.flags |= TT_CLIENT_NEW;
237
238 hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig,
239 &tt_local_entry->common,
240 &tt_local_entry->common.hash_entry);
241
242 if (unlikely(hash_added != 0)) {
243 /* remove the reference for the hash */
244 tt_local_entry_free_ref(tt_local_entry);
245 goto out;
246 }
247
248 tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
249
250 /* remove address from global hash if present */
251 tt_global_entry = tt_global_hash_find(bat_priv, addr);
252
253 /* Check whether it is a roaming! */
254 if (tt_global_entry) {
255 /* These node are probably going to update their tt table */
256 head = &tt_global_entry->orig_list;
257 rcu_read_lock();
258 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
259 orig_entry->orig_node->tt_poss_change = true;
260
261 send_roam_adv(bat_priv, tt_global_entry->common.addr,
262 orig_entry->orig_node);
263 }
264 rcu_read_unlock();
265 /* The global entry has to be marked as ROAMING and
266 * has to be kept for consistency purpose
267 */
268 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
269 tt_global_entry->roam_at = jiffies;
270 }
271 out:
272 if (tt_local_entry)
273 tt_local_entry_free_ref(tt_local_entry);
274 if (tt_global_entry)
275 tt_global_entry_free_ref(tt_global_entry);
276 }
277
278 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
279 unsigned char *buff, int buff_len)
280 {
281 int count = 0, tot_changes = 0;
282 struct tt_change_node *entry, *safe;
283
284 if (buff_len > 0)
285 tot_changes = buff_len / tt_len(1);
286
287 spin_lock_bh(&bat_priv->tt_changes_list_lock);
288 atomic_set(&bat_priv->tt_local_changes, 0);
289
290 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
291 list) {
292 if (count < tot_changes) {
293 memcpy(buff + tt_len(count),
294 &entry->change, sizeof(struct tt_change));
295 count++;
296 }
297 list_del(&entry->list);
298 kfree(entry);
299 }
300 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
301
302 /* Keep the buffer for possible tt_request */
303 spin_lock_bh(&bat_priv->tt_buff_lock);
304 kfree(bat_priv->tt_buff);
305 bat_priv->tt_buff_len = 0;
306 bat_priv->tt_buff = NULL;
307 /* We check whether this new OGM has no changes due to size
308 * problems */
309 if (buff_len > 0) {
310 /**
311 * if kmalloc() fails we will reply with the full table
312 * instead of providing the diff
313 */
314 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
315 if (bat_priv->tt_buff) {
316 memcpy(bat_priv->tt_buff, buff, buff_len);
317 bat_priv->tt_buff_len = buff_len;
318 }
319 }
320 spin_unlock_bh(&bat_priv->tt_buff_lock);
321
322 return count;
323 }
324
325 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
326 {
327 struct net_device *net_dev = (struct net_device *)seq->private;
328 struct bat_priv *bat_priv = netdev_priv(net_dev);
329 struct hashtable_t *hash = bat_priv->tt_local_hash;
330 struct tt_common_entry *tt_common_entry;
331 struct hard_iface *primary_if;
332 struct hlist_node *node;
333 struct hlist_head *head;
334 uint32_t i;
335 int ret = 0;
336
337 primary_if = primary_if_get_selected(bat_priv);
338 if (!primary_if) {
339 ret = seq_printf(seq,
340 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
341 net_dev->name);
342 goto out;
343 }
344
345 if (primary_if->if_status != IF_ACTIVE) {
346 ret = seq_printf(seq,
347 "BATMAN mesh %s disabled - primary interface not active\n",
348 net_dev->name);
349 goto out;
350 }
351
352 seq_printf(seq,
353 "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
354 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
355
356 for (i = 0; i < hash->size; i++) {
357 head = &hash->table[i];
358
359 rcu_read_lock();
360 hlist_for_each_entry_rcu(tt_common_entry, node,
361 head, hash_entry) {
362 seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
363 tt_common_entry->addr,
364 (tt_common_entry->flags &
365 TT_CLIENT_ROAM ? 'R' : '.'),
366 (tt_common_entry->flags &
367 TT_CLIENT_NOPURGE ? 'P' : '.'),
368 (tt_common_entry->flags &
369 TT_CLIENT_NEW ? 'N' : '.'),
370 (tt_common_entry->flags &
371 TT_CLIENT_PENDING ? 'X' : '.'),
372 (tt_common_entry->flags &
373 TT_CLIENT_WIFI ? 'W' : '.'));
374 }
375 rcu_read_unlock();
376 }
377 out:
378 if (primary_if)
379 hardif_free_ref(primary_if);
380 return ret;
381 }
382
383 static void tt_local_set_pending(struct bat_priv *bat_priv,
384 struct tt_local_entry *tt_local_entry,
385 uint16_t flags, const char *message)
386 {
387 tt_local_event(bat_priv, tt_local_entry->common.addr,
388 tt_local_entry->common.flags | flags);
389
390 /* The local client has to be marked as "pending to be removed" but has
391 * to be kept in the table in order to send it in a full table
392 * response issued before the net ttvn increment (consistency check) */
393 tt_local_entry->common.flags |= TT_CLIENT_PENDING;
394
395 bat_dbg(DBG_TT, bat_priv,
396 "Local tt entry (%pM) pending to be removed: %s\n",
397 tt_local_entry->common.addr, message);
398 }
399
400 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
401 const char *message, bool roaming)
402 {
403 struct tt_local_entry *tt_local_entry = NULL;
404
405 tt_local_entry = tt_local_hash_find(bat_priv, addr);
406 if (!tt_local_entry)
407 goto out;
408
409 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
410 (roaming ? TT_CLIENT_ROAM : NO_FLAGS), message);
411 out:
412 if (tt_local_entry)
413 tt_local_entry_free_ref(tt_local_entry);
414 }
415
416 static void tt_local_purge(struct bat_priv *bat_priv)
417 {
418 struct hashtable_t *hash = bat_priv->tt_local_hash;
419 struct tt_local_entry *tt_local_entry;
420 struct tt_common_entry *tt_common_entry;
421 struct hlist_node *node, *node_tmp;
422 struct hlist_head *head;
423 spinlock_t *list_lock; /* protects write access to the hash lists */
424 uint32_t i;
425
426 for (i = 0; i < hash->size; i++) {
427 head = &hash->table[i];
428 list_lock = &hash->list_locks[i];
429
430 spin_lock_bh(list_lock);
431 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
432 head, hash_entry) {
433 tt_local_entry = container_of(tt_common_entry,
434 struct tt_local_entry,
435 common);
436 if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
437 continue;
438
439 /* entry already marked for deletion */
440 if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
441 continue;
442
443 if (!has_timed_out(tt_local_entry->last_seen,
444 TT_LOCAL_TIMEOUT))
445 continue;
446
447 tt_local_set_pending(bat_priv, tt_local_entry,
448 TT_CLIENT_DEL, "timed out");
449 }
450 spin_unlock_bh(list_lock);
451 }
452
453 }
454
455 static void tt_local_table_free(struct bat_priv *bat_priv)
456 {
457 struct hashtable_t *hash;
458 spinlock_t *list_lock; /* protects write access to the hash lists */
459 struct tt_common_entry *tt_common_entry;
460 struct tt_local_entry *tt_local_entry;
461 struct hlist_node *node, *node_tmp;
462 struct hlist_head *head;
463 uint32_t i;
464
465 if (!bat_priv->tt_local_hash)
466 return;
467
468 hash = bat_priv->tt_local_hash;
469
470 for (i = 0; i < hash->size; i++) {
471 head = &hash->table[i];
472 list_lock = &hash->list_locks[i];
473
474 spin_lock_bh(list_lock);
475 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
476 head, hash_entry) {
477 hlist_del_rcu(node);
478 tt_local_entry = container_of(tt_common_entry,
479 struct tt_local_entry,
480 common);
481 tt_local_entry_free_ref(tt_local_entry);
482 }
483 spin_unlock_bh(list_lock);
484 }
485
486 hash_destroy(hash);
487
488 bat_priv->tt_local_hash = NULL;
489 }
490
491 static int tt_global_init(struct bat_priv *bat_priv)
492 {
493 if (bat_priv->tt_global_hash)
494 return 0;
495
496 bat_priv->tt_global_hash = hash_new(1024);
497
498 if (!bat_priv->tt_global_hash)
499 return -ENOMEM;
500
501 return 0;
502 }
503
504 static void tt_changes_list_free(struct bat_priv *bat_priv)
505 {
506 struct tt_change_node *entry, *safe;
507
508 spin_lock_bh(&bat_priv->tt_changes_list_lock);
509
510 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
511 list) {
512 list_del(&entry->list);
513 kfree(entry);
514 }
515
516 atomic_set(&bat_priv->tt_local_changes, 0);
517 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
518 }
519
520 /* find out if an orig_node is already in the list of a tt_global_entry.
521 * returns 1 if found, 0 otherwise
522 */
523 static bool tt_global_entry_has_orig(const struct tt_global_entry *entry,
524 const struct orig_node *orig_node)
525 {
526 struct tt_orig_list_entry *tmp_orig_entry;
527 const struct hlist_head *head;
528 struct hlist_node *node;
529 bool found = false;
530
531 rcu_read_lock();
532 head = &entry->orig_list;
533 hlist_for_each_entry_rcu(tmp_orig_entry, node, head, list) {
534 if (tmp_orig_entry->orig_node == orig_node) {
535 found = true;
536 break;
537 }
538 }
539 rcu_read_unlock();
540 return found;
541 }
542
543 static void tt_global_add_orig_entry(struct tt_global_entry *tt_global_entry,
544 struct orig_node *orig_node,
545 int ttvn)
546 {
547 struct tt_orig_list_entry *orig_entry;
548
549 orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
550 if (!orig_entry)
551 return;
552
553 INIT_HLIST_NODE(&orig_entry->list);
554 atomic_inc(&orig_node->refcount);
555 atomic_inc(&orig_node->tt_size);
556 orig_entry->orig_node = orig_node;
557 orig_entry->ttvn = ttvn;
558
559 spin_lock_bh(&tt_global_entry->list_lock);
560 hlist_add_head_rcu(&orig_entry->list,
561 &tt_global_entry->orig_list);
562 spin_unlock_bh(&tt_global_entry->list_lock);
563 }
564
565 /* caller must hold orig_node refcount */
566 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
567 const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
568 bool wifi)
569 {
570 struct tt_global_entry *tt_global_entry = NULL;
571 int ret = 0;
572 int hash_added;
573
574 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
575
576 if (!tt_global_entry) {
577 tt_global_entry = kzalloc(sizeof(*tt_global_entry),
578 GFP_ATOMIC);
579 if (!tt_global_entry)
580 goto out;
581
582 memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);
583
584 tt_global_entry->common.flags = NO_FLAGS;
585 tt_global_entry->roam_at = 0;
586 atomic_set(&tt_global_entry->common.refcount, 2);
587
588 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
589 spin_lock_init(&tt_global_entry->list_lock);
590
591 hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,
592 choose_orig, &tt_global_entry->common,
593 &tt_global_entry->common.hash_entry);
594
595 if (unlikely(hash_added != 0)) {
596 /* remove the reference for the hash */
597 tt_global_entry_free_ref(tt_global_entry);
598 goto out_remove;
599 }
600
601 tt_global_add_orig_entry(tt_global_entry, orig_node, ttvn);
602 } else {
603 /* there is already a global entry, use this one. */
604
605 /* If there is the TT_CLIENT_ROAM flag set, there is only one
606 * originator left in the list and we previously received a
607 * delete + roaming change for this originator.
608 *
609 * We should first delete the old originator before adding the
610 * new one.
611 */
612 if (tt_global_entry->common.flags & TT_CLIENT_ROAM) {
613 tt_global_del_orig_list(tt_global_entry);
614 tt_global_entry->common.flags &= ~TT_CLIENT_ROAM;
615 tt_global_entry->roam_at = 0;
616 }
617
618 if (!tt_global_entry_has_orig(tt_global_entry, orig_node))
619 tt_global_add_orig_entry(tt_global_entry, orig_node,
620 ttvn);
621 }
622
623 if (wifi)
624 tt_global_entry->common.flags |= TT_CLIENT_WIFI;
625
626 bat_dbg(DBG_TT, bat_priv,
627 "Creating new global tt entry: %pM (via %pM)\n",
628 tt_global_entry->common.addr, orig_node->orig);
629
630 out_remove:
631 /* remove address from local hash if present */
632 tt_local_remove(bat_priv, tt_global_entry->common.addr,
633 "global tt received", roaming);
634 ret = 1;
635 out:
636 if (tt_global_entry)
637 tt_global_entry_free_ref(tt_global_entry);
638 return ret;
639 }
640
641 /* print all orig nodes who announce the address for this global entry.
642 * it is assumed that the caller holds rcu_read_lock();
643 */
644 static void tt_global_print_entry(struct tt_global_entry *tt_global_entry,
645 struct seq_file *seq)
646 {
647 struct hlist_head *head;
648 struct hlist_node *node;
649 struct tt_orig_list_entry *orig_entry;
650 struct tt_common_entry *tt_common_entry;
651 uint16_t flags;
652 uint8_t last_ttvn;
653
654 tt_common_entry = &tt_global_entry->common;
655
656 head = &tt_global_entry->orig_list;
657
658 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
659 flags = tt_common_entry->flags;
660 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
661 seq_printf(seq, " * %pM (%3u) via %pM (%3u) [%c%c]\n",
662 tt_global_entry->common.addr, orig_entry->ttvn,
663 orig_entry->orig_node->orig, last_ttvn,
664 (flags & TT_CLIENT_ROAM ? 'R' : '.'),
665 (flags & TT_CLIENT_WIFI ? 'W' : '.'));
666 }
667 }
668
669 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
670 {
671 struct net_device *net_dev = (struct net_device *)seq->private;
672 struct bat_priv *bat_priv = netdev_priv(net_dev);
673 struct hashtable_t *hash = bat_priv->tt_global_hash;
674 struct tt_common_entry *tt_common_entry;
675 struct tt_global_entry *tt_global_entry;
676 struct hard_iface *primary_if;
677 struct hlist_node *node;
678 struct hlist_head *head;
679 uint32_t i;
680 int ret = 0;
681
682 primary_if = primary_if_get_selected(bat_priv);
683 if (!primary_if) {
684 ret = seq_printf(seq,
685 "BATMAN mesh %s disabled - please specify interfaces to enable it\n",
686 net_dev->name);
687 goto out;
688 }
689
690 if (primary_if->if_status != IF_ACTIVE) {
691 ret = seq_printf(seq,
692 "BATMAN mesh %s disabled - primary interface not active\n",
693 net_dev->name);
694 goto out;
695 }
696
697 seq_printf(seq,
698 "Globally announced TT entries received via the mesh %s\n",
699 net_dev->name);
700 seq_printf(seq, " %-13s %s %-15s %s %s\n",
701 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
702
703 for (i = 0; i < hash->size; i++) {
704 head = &hash->table[i];
705
706 rcu_read_lock();
707 hlist_for_each_entry_rcu(tt_common_entry, node,
708 head, hash_entry) {
709 tt_global_entry = container_of(tt_common_entry,
710 struct tt_global_entry,
711 common);
712 tt_global_print_entry(tt_global_entry, seq);
713 }
714 rcu_read_unlock();
715 }
716 out:
717 if (primary_if)
718 hardif_free_ref(primary_if);
719 return ret;
720 }
721
722 /* deletes the orig list of a tt_global_entry */
723 static void tt_global_del_orig_list(struct tt_global_entry *tt_global_entry)
724 {
725 struct hlist_head *head;
726 struct hlist_node *node, *safe;
727 struct tt_orig_list_entry *orig_entry;
728
729 spin_lock_bh(&tt_global_entry->list_lock);
730 head = &tt_global_entry->orig_list;
731 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
732 hlist_del_rcu(node);
733 tt_orig_list_entry_free_ref(orig_entry);
734 }
735 spin_unlock_bh(&tt_global_entry->list_lock);
736
737 }
738
739 static void tt_global_del_orig_entry(struct bat_priv *bat_priv,
740 struct tt_global_entry *tt_global_entry,
741 struct orig_node *orig_node,
742 const char *message)
743 {
744 struct hlist_head *head;
745 struct hlist_node *node, *safe;
746 struct tt_orig_list_entry *orig_entry;
747
748 spin_lock_bh(&tt_global_entry->list_lock);
749 head = &tt_global_entry->orig_list;
750 hlist_for_each_entry_safe(orig_entry, node, safe, head, list) {
751 if (orig_entry->orig_node == orig_node) {
752 bat_dbg(DBG_TT, bat_priv,
753 "Deleting %pM from global tt entry %pM: %s\n",
754 orig_node->orig, tt_global_entry->common.addr,
755 message);
756 hlist_del_rcu(node);
757 tt_orig_list_entry_free_ref(orig_entry);
758 }
759 }
760 spin_unlock_bh(&tt_global_entry->list_lock);
761 }
762
763 static void tt_global_del_struct(struct bat_priv *bat_priv,
764 struct tt_global_entry *tt_global_entry,
765 const char *message)
766 {
767 bat_dbg(DBG_TT, bat_priv,
768 "Deleting global tt entry %pM: %s\n",
769 tt_global_entry->common.addr, message);
770
771 hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
772 tt_global_entry->common.addr);
773 tt_global_entry_free_ref(tt_global_entry);
774
775 }
776
777 /* If the client is to be deleted, we check if it is the last origantor entry
778 * within tt_global entry. If yes, we set the TT_CLIENT_ROAM flag and the timer,
779 * otherwise we simply remove the originator scheduled for deletion.
780 */
781 static void tt_global_del_roaming(struct bat_priv *bat_priv,
782 struct tt_global_entry *tt_global_entry,
783 struct orig_node *orig_node,
784 const char *message)
785 {
786 bool last_entry = true;
787 struct hlist_head *head;
788 struct hlist_node *node;
789 struct tt_orig_list_entry *orig_entry;
790
791 /* no local entry exists, case 1:
792 * Check if this is the last one or if other entries exist.
793 */
794
795 rcu_read_lock();
796 head = &tt_global_entry->orig_list;
797 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
798 if (orig_entry->orig_node != orig_node) {
799 last_entry = false;
800 break;
801 }
802 }
803 rcu_read_unlock();
804
805 if (last_entry) {
806 /* its the last one, mark for roaming. */
807 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
808 tt_global_entry->roam_at = jiffies;
809 } else
810 /* there is another entry, we can simply delete this
811 * one and can still use the other one.
812 */
813 tt_global_del_orig_entry(bat_priv, tt_global_entry,
814 orig_node, message);
815 }
816
817
818
819 static void tt_global_del(struct bat_priv *bat_priv,
820 struct orig_node *orig_node,
821 const unsigned char *addr,
822 const char *message, bool roaming)
823 {
824 struct tt_global_entry *tt_global_entry = NULL;
825 struct tt_local_entry *tt_local_entry = NULL;
826
827 tt_global_entry = tt_global_hash_find(bat_priv, addr);
828 if (!tt_global_entry)
829 goto out;
830
831 if (!roaming) {
832 tt_global_del_orig_entry(bat_priv, tt_global_entry, orig_node,
833 message);
834
835 if (hlist_empty(&tt_global_entry->orig_list))
836 tt_global_del_struct(bat_priv, tt_global_entry,
837 message);
838
839 goto out;
840 }
841
842 /* if we are deleting a global entry due to a roam
843 * event, there are two possibilities:
844 * 1) the client roamed from node A to node B => if there
845 * is only one originator left for this client, we mark
846 * it with TT_CLIENT_ROAM, we start a timer and we
847 * wait for node B to claim it. In case of timeout
848 * the entry is purged.
849 *
850 * If there are other originators left, we directly delete
851 * the originator.
852 * 2) the client roamed to us => we can directly delete
853 * the global entry, since it is useless now. */
854
855 tt_local_entry = tt_local_hash_find(bat_priv,
856 tt_global_entry->common.addr);
857 if (tt_local_entry) {
858 /* local entry exists, case 2: client roamed to us. */
859 tt_global_del_orig_list(tt_global_entry);
860 tt_global_del_struct(bat_priv, tt_global_entry, message);
861 } else
862 /* no local entry exists, case 1: check for roaming */
863 tt_global_del_roaming(bat_priv, tt_global_entry, orig_node,
864 message);
865
866
867 out:
868 if (tt_global_entry)
869 tt_global_entry_free_ref(tt_global_entry);
870 if (tt_local_entry)
871 tt_local_entry_free_ref(tt_local_entry);
872 }
873
874 void tt_global_del_orig(struct bat_priv *bat_priv,
875 struct orig_node *orig_node, const char *message)
876 {
877 struct tt_global_entry *tt_global_entry;
878 struct tt_common_entry *tt_common_entry;
879 uint32_t i;
880 struct hashtable_t *hash = bat_priv->tt_global_hash;
881 struct hlist_node *node, *safe;
882 struct hlist_head *head;
883 spinlock_t *list_lock; /* protects write access to the hash lists */
884
885 if (!hash)
886 return;
887
888 for (i = 0; i < hash->size; i++) {
889 head = &hash->table[i];
890 list_lock = &hash->list_locks[i];
891
892 spin_lock_bh(list_lock);
893 hlist_for_each_entry_safe(tt_common_entry, node, safe,
894 head, hash_entry) {
895 tt_global_entry = container_of(tt_common_entry,
896 struct tt_global_entry,
897 common);
898
899 tt_global_del_orig_entry(bat_priv, tt_global_entry,
900 orig_node, message);
901
902 if (hlist_empty(&tt_global_entry->orig_list)) {
903 bat_dbg(DBG_TT, bat_priv,
904 "Deleting global tt entry %pM: %s\n",
905 tt_global_entry->common.addr,
906 message);
907 hlist_del_rcu(node);
908 tt_global_entry_free_ref(tt_global_entry);
909 }
910 }
911 spin_unlock_bh(list_lock);
912 }
913 atomic_set(&orig_node->tt_size, 0);
914 orig_node->tt_initialised = false;
915 }
916
917 static void tt_global_roam_purge(struct bat_priv *bat_priv)
918 {
919 struct hashtable_t *hash = bat_priv->tt_global_hash;
920 struct tt_common_entry *tt_common_entry;
921 struct tt_global_entry *tt_global_entry;
922 struct hlist_node *node, *node_tmp;
923 struct hlist_head *head;
924 spinlock_t *list_lock; /* protects write access to the hash lists */
925 uint32_t i;
926
927 for (i = 0; i < hash->size; i++) {
928 head = &hash->table[i];
929 list_lock = &hash->list_locks[i];
930
931 spin_lock_bh(list_lock);
932 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
933 head, hash_entry) {
934 tt_global_entry = container_of(tt_common_entry,
935 struct tt_global_entry,
936 common);
937 if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
938 continue;
939 if (!has_timed_out(tt_global_entry->roam_at,
940 TT_CLIENT_ROAM_TIMEOUT))
941 continue;
942
943 bat_dbg(DBG_TT, bat_priv,
944 "Deleting global tt entry (%pM): Roaming timeout\n",
945 tt_global_entry->common.addr);
946
947 hlist_del_rcu(node);
948 tt_global_entry_free_ref(tt_global_entry);
949 }
950 spin_unlock_bh(list_lock);
951 }
952
953 }
954
955 static void tt_global_table_free(struct bat_priv *bat_priv)
956 {
957 struct hashtable_t *hash;
958 spinlock_t *list_lock; /* protects write access to the hash lists */
959 struct tt_common_entry *tt_common_entry;
960 struct tt_global_entry *tt_global_entry;
961 struct hlist_node *node, *node_tmp;
962 struct hlist_head *head;
963 uint32_t i;
964
965 if (!bat_priv->tt_global_hash)
966 return;
967
968 hash = bat_priv->tt_global_hash;
969
970 for (i = 0; i < hash->size; i++) {
971 head = &hash->table[i];
972 list_lock = &hash->list_locks[i];
973
974 spin_lock_bh(list_lock);
975 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
976 head, hash_entry) {
977 hlist_del_rcu(node);
978 tt_global_entry = container_of(tt_common_entry,
979 struct tt_global_entry,
980 common);
981 tt_global_entry_free_ref(tt_global_entry);
982 }
983 spin_unlock_bh(list_lock);
984 }
985
986 hash_destroy(hash);
987
988 bat_priv->tt_global_hash = NULL;
989 }
990
991 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
992 struct tt_global_entry *tt_global_entry)
993 {
994 bool ret = false;
995
996 if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
997 tt_global_entry->common.flags & TT_CLIENT_WIFI)
998 ret = true;
999
1000 return ret;
1001 }
1002
1003 struct orig_node *transtable_search(struct bat_priv *bat_priv,
1004 const uint8_t *src, const uint8_t *addr)
1005 {
1006 struct tt_local_entry *tt_local_entry = NULL;
1007 struct tt_global_entry *tt_global_entry = NULL;
1008 struct orig_node *orig_node = NULL;
1009 struct neigh_node *router = NULL;
1010 struct hlist_head *head;
1011 struct hlist_node *node;
1012 struct tt_orig_list_entry *orig_entry;
1013 int best_tq;
1014
1015 if (src && atomic_read(&bat_priv->ap_isolation)) {
1016 tt_local_entry = tt_local_hash_find(bat_priv, src);
1017 if (!tt_local_entry)
1018 goto out;
1019 }
1020
1021 tt_global_entry = tt_global_hash_find(bat_priv, addr);
1022 if (!tt_global_entry)
1023 goto out;
1024
1025 /* check whether the clients should not communicate due to AP
1026 * isolation */
1027 if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
1028 goto out;
1029
1030 best_tq = 0;
1031
1032 rcu_read_lock();
1033 head = &tt_global_entry->orig_list;
1034 hlist_for_each_entry_rcu(orig_entry, node, head, list) {
1035 router = orig_node_get_router(orig_entry->orig_node);
1036 if (!router)
1037 continue;
1038
1039 if (router->tq_avg > best_tq) {
1040 orig_node = orig_entry->orig_node;
1041 best_tq = router->tq_avg;
1042 }
1043 neigh_node_free_ref(router);
1044 }
1045 /* found anything? */
1046 if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1047 orig_node = NULL;
1048 rcu_read_unlock();
1049 out:
1050 if (tt_global_entry)
1051 tt_global_entry_free_ref(tt_global_entry);
1052 if (tt_local_entry)
1053 tt_local_entry_free_ref(tt_local_entry);
1054
1055 return orig_node;
1056 }
1057
1058 /* Calculates the checksum of the local table of a given orig_node */
1059 static uint16_t tt_global_crc(struct bat_priv *bat_priv,
1060 struct orig_node *orig_node)
1061 {
1062 uint16_t total = 0, total_one;
1063 struct hashtable_t *hash = bat_priv->tt_global_hash;
1064 struct tt_common_entry *tt_common_entry;
1065 struct tt_global_entry *tt_global_entry;
1066 struct hlist_node *node;
1067 struct hlist_head *head;
1068 uint32_t i;
1069 int j;
1070
1071 for (i = 0; i < hash->size; i++) {
1072 head = &hash->table[i];
1073
1074 rcu_read_lock();
1075 hlist_for_each_entry_rcu(tt_common_entry, node,
1076 head, hash_entry) {
1077 tt_global_entry = container_of(tt_common_entry,
1078 struct tt_global_entry,
1079 common);
1080 /* Roaming clients are in the global table for
1081 * consistency only. They don't have to be
1082 * taken into account while computing the
1083 * global crc
1084 */
1085 if (tt_global_entry->common.flags & TT_CLIENT_ROAM)
1086 continue;
1087
1088 /* find out if this global entry is announced by this
1089 * originator
1090 */
1091 if (!tt_global_entry_has_orig(tt_global_entry,
1092 orig_node))
1093 continue;
1094
1095 total_one = 0;
1096 for (j = 0; j < ETH_ALEN; j++)
1097 total_one = crc16_byte(total_one,
1098 tt_global_entry->common.addr[j]);
1099 total ^= total_one;
1100 }
1101 rcu_read_unlock();
1102 }
1103
1104 return total;
1105 }
1106
1107 /* Calculates the checksum of the local table */
1108 uint16_t tt_local_crc(struct bat_priv *bat_priv)
1109 {
1110 uint16_t total = 0, total_one;
1111 struct hashtable_t *hash = bat_priv->tt_local_hash;
1112 struct tt_common_entry *tt_common_entry;
1113 struct hlist_node *node;
1114 struct hlist_head *head;
1115 uint32_t i;
1116 int j;
1117
1118 for (i = 0; i < hash->size; i++) {
1119 head = &hash->table[i];
1120
1121 rcu_read_lock();
1122 hlist_for_each_entry_rcu(tt_common_entry, node,
1123 head, hash_entry) {
1124 /* not yet committed clients have not to be taken into
1125 * account while computing the CRC */
1126 if (tt_common_entry->flags & TT_CLIENT_NEW)
1127 continue;
1128 total_one = 0;
1129 for (j = 0; j < ETH_ALEN; j++)
1130 total_one = crc16_byte(total_one,
1131 tt_common_entry->addr[j]);
1132 total ^= total_one;
1133 }
1134 rcu_read_unlock();
1135 }
1136
1137 return total;
1138 }
1139
1140 static void tt_req_list_free(struct bat_priv *bat_priv)
1141 {
1142 struct tt_req_node *node, *safe;
1143
1144 spin_lock_bh(&bat_priv->tt_req_list_lock);
1145
1146 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1147 list_del(&node->list);
1148 kfree(node);
1149 }
1150
1151 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1152 }
1153
1154 static void tt_save_orig_buffer(struct bat_priv *bat_priv,
1155 struct orig_node *orig_node,
1156 const unsigned char *tt_buff,
1157 uint8_t tt_num_changes)
1158 {
1159 uint16_t tt_buff_len = tt_len(tt_num_changes);
1160
1161 /* Replace the old buffer only if I received something in the
1162 * last OGM (the OGM could carry no changes) */
1163 spin_lock_bh(&orig_node->tt_buff_lock);
1164 if (tt_buff_len > 0) {
1165 kfree(orig_node->tt_buff);
1166 orig_node->tt_buff_len = 0;
1167 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
1168 if (orig_node->tt_buff) {
1169 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
1170 orig_node->tt_buff_len = tt_buff_len;
1171 }
1172 }
1173 spin_unlock_bh(&orig_node->tt_buff_lock);
1174 }
1175
1176 static void tt_req_purge(struct bat_priv *bat_priv)
1177 {
1178 struct tt_req_node *node, *safe;
1179
1180 spin_lock_bh(&bat_priv->tt_req_list_lock);
1181 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1182 if (has_timed_out(node->issued_at, TT_REQUEST_TIMEOUT)) {
1183 list_del(&node->list);
1184 kfree(node);
1185 }
1186 }
1187 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1188 }
1189
1190 /* returns the pointer to the new tt_req_node struct if no request
1191 * has already been issued for this orig_node, NULL otherwise */
1192 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
1193 struct orig_node *orig_node)
1194 {
1195 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
1196
1197 spin_lock_bh(&bat_priv->tt_req_list_lock);
1198 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
1199 if (compare_eth(tt_req_node_tmp, orig_node) &&
1200 !has_timed_out(tt_req_node_tmp->issued_at,
1201 TT_REQUEST_TIMEOUT))
1202 goto unlock;
1203 }
1204
1205 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1206 if (!tt_req_node)
1207 goto unlock;
1208
1209 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1210 tt_req_node->issued_at = jiffies;
1211
1212 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
1213 unlock:
1214 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1215 return tt_req_node;
1216 }
1217
1218 /* data_ptr is useless here, but has to be kept to respect the prototype */
1219 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1220 {
1221 const struct tt_common_entry *tt_common_entry = entry_ptr;
1222
1223 if (tt_common_entry->flags & TT_CLIENT_NEW)
1224 return 0;
1225 return 1;
1226 }
1227
1228 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1229 {
1230 const struct tt_common_entry *tt_common_entry = entry_ptr;
1231 const struct tt_global_entry *tt_global_entry;
1232 const struct orig_node *orig_node = data_ptr;
1233
1234 if (tt_common_entry->flags & TT_CLIENT_ROAM)
1235 return 0;
1236
1237 tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
1238 common);
1239
1240 return tt_global_entry_has_orig(tt_global_entry, orig_node);
1241 }
1242
1243 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1244 struct hashtable_t *hash,
1245 struct hard_iface *primary_if,
1246 int (*valid_cb)(const void *,
1247 const void *),
1248 void *cb_data)
1249 {
1250 struct tt_common_entry *tt_common_entry;
1251 struct tt_query_packet *tt_response;
1252 struct tt_change *tt_change;
1253 struct hlist_node *node;
1254 struct hlist_head *head;
1255 struct sk_buff *skb = NULL;
1256 uint16_t tt_tot, tt_count;
1257 ssize_t tt_query_size = sizeof(struct tt_query_packet);
1258 uint32_t i;
1259
1260 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1261 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1262 tt_len -= tt_len % sizeof(struct tt_change);
1263 }
1264 tt_tot = tt_len / sizeof(struct tt_change);
1265
1266 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1267 if (!skb)
1268 goto out;
1269
1270 skb_reserve(skb, ETH_HLEN);
1271 tt_response = (struct tt_query_packet *)skb_put(skb,
1272 tt_query_size + tt_len);
1273 tt_response->ttvn = ttvn;
1274
1275 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1276 tt_count = 0;
1277
1278 rcu_read_lock();
1279 for (i = 0; i < hash->size; i++) {
1280 head = &hash->table[i];
1281
1282 hlist_for_each_entry_rcu(tt_common_entry, node,
1283 head, hash_entry) {
1284 if (tt_count == tt_tot)
1285 break;
1286
1287 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1288 continue;
1289
1290 memcpy(tt_change->addr, tt_common_entry->addr,
1291 ETH_ALEN);
1292 tt_change->flags = NO_FLAGS;
1293
1294 tt_count++;
1295 tt_change++;
1296 }
1297 }
1298 rcu_read_unlock();
1299
1300 /* store in the message the number of entries we have successfully
1301 * copied */
1302 tt_response->tt_data = htons(tt_count);
1303
1304 out:
1305 return skb;
1306 }
1307
1308 static int send_tt_request(struct bat_priv *bat_priv,
1309 struct orig_node *dst_orig_node,
1310 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1311 {
1312 struct sk_buff *skb = NULL;
1313 struct tt_query_packet *tt_request;
1314 struct neigh_node *neigh_node = NULL;
1315 struct hard_iface *primary_if;
1316 struct tt_req_node *tt_req_node = NULL;
1317 int ret = 1;
1318
1319 primary_if = primary_if_get_selected(bat_priv);
1320 if (!primary_if)
1321 goto out;
1322
1323 /* The new tt_req will be issued only if I'm not waiting for a
1324 * reply from the same orig_node yet */
1325 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1326 if (!tt_req_node)
1327 goto out;
1328
1329 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1330 if (!skb)
1331 goto out;
1332
1333 skb_reserve(skb, ETH_HLEN);
1334
1335 tt_request = (struct tt_query_packet *)skb_put(skb,
1336 sizeof(struct tt_query_packet));
1337
1338 tt_request->header.packet_type = BAT_TT_QUERY;
1339 tt_request->header.version = COMPAT_VERSION;
1340 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1341 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1342 tt_request->header.ttl = TTL;
1343 tt_request->ttvn = ttvn;
1344 tt_request->tt_data = htons(tt_crc);
1345 tt_request->flags = TT_REQUEST;
1346
1347 if (full_table)
1348 tt_request->flags |= TT_FULL_TABLE;
1349
1350 neigh_node = orig_node_get_router(dst_orig_node);
1351 if (!neigh_node)
1352 goto out;
1353
1354 bat_dbg(DBG_TT, bat_priv,
1355 "Sending TT_REQUEST to %pM via %pM [%c]\n",
1356 dst_orig_node->orig, neigh_node->addr,
1357 (full_table ? 'F' : '.'));
1358
1359 batadv_inc_counter(bat_priv, BAT_CNT_TT_REQUEST_TX);
1360
1361 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1362 ret = 0;
1363
1364 out:
1365 if (neigh_node)
1366 neigh_node_free_ref(neigh_node);
1367 if (primary_if)
1368 hardif_free_ref(primary_if);
1369 if (ret)
1370 kfree_skb(skb);
1371 if (ret && tt_req_node) {
1372 spin_lock_bh(&bat_priv->tt_req_list_lock);
1373 list_del(&tt_req_node->list);
1374 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1375 kfree(tt_req_node);
1376 }
1377 return ret;
1378 }
1379
1380 static bool send_other_tt_response(struct bat_priv *bat_priv,
1381 struct tt_query_packet *tt_request)
1382 {
1383 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1384 struct neigh_node *neigh_node = NULL;
1385 struct hard_iface *primary_if = NULL;
1386 uint8_t orig_ttvn, req_ttvn, ttvn;
1387 int ret = false;
1388 unsigned char *tt_buff;
1389 bool full_table;
1390 uint16_t tt_len, tt_tot;
1391 struct sk_buff *skb = NULL;
1392 struct tt_query_packet *tt_response;
1393
1394 bat_dbg(DBG_TT, bat_priv,
1395 "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
1396 tt_request->src, tt_request->ttvn, tt_request->dst,
1397 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1398
1399 /* Let's get the orig node of the REAL destination */
1400 req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst);
1401 if (!req_dst_orig_node)
1402 goto out;
1403
1404 res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src);
1405 if (!res_dst_orig_node)
1406 goto out;
1407
1408 neigh_node = orig_node_get_router(res_dst_orig_node);
1409 if (!neigh_node)
1410 goto out;
1411
1412 primary_if = primary_if_get_selected(bat_priv);
1413 if (!primary_if)
1414 goto out;
1415
1416 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1417 req_ttvn = tt_request->ttvn;
1418
1419 /* I don't have the requested data */
1420 if (orig_ttvn != req_ttvn ||
1421 tt_request->tt_data != htons(req_dst_orig_node->tt_crc))
1422 goto out;
1423
1424 /* If the full table has been explicitly requested */
1425 if (tt_request->flags & TT_FULL_TABLE ||
1426 !req_dst_orig_node->tt_buff)
1427 full_table = true;
1428 else
1429 full_table = false;
1430
1431 /* In this version, fragmentation is not implemented, then
1432 * I'll send only one packet with as much TT entries as I can */
1433 if (!full_table) {
1434 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1435 tt_len = req_dst_orig_node->tt_buff_len;
1436 tt_tot = tt_len / sizeof(struct tt_change);
1437
1438 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1439 tt_len + ETH_HLEN);
1440 if (!skb)
1441 goto unlock;
1442
1443 skb_reserve(skb, ETH_HLEN);
1444 tt_response = (struct tt_query_packet *)skb_put(skb,
1445 sizeof(struct tt_query_packet) + tt_len);
1446 tt_response->ttvn = req_ttvn;
1447 tt_response->tt_data = htons(tt_tot);
1448
1449 tt_buff = skb->data + sizeof(struct tt_query_packet);
1450 /* Copy the last orig_node's OGM buffer */
1451 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1452 req_dst_orig_node->tt_buff_len);
1453
1454 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1455 } else {
1456 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1457 sizeof(struct tt_change);
1458 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1459
1460 skb = tt_response_fill_table(tt_len, ttvn,
1461 bat_priv->tt_global_hash,
1462 primary_if, tt_global_valid_entry,
1463 req_dst_orig_node);
1464 if (!skb)
1465 goto out;
1466
1467 tt_response = (struct tt_query_packet *)skb->data;
1468 }
1469
1470 tt_response->header.packet_type = BAT_TT_QUERY;
1471 tt_response->header.version = COMPAT_VERSION;
1472 tt_response->header.ttl = TTL;
1473 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1474 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1475 tt_response->flags = TT_RESPONSE;
1476
1477 if (full_table)
1478 tt_response->flags |= TT_FULL_TABLE;
1479
1480 bat_dbg(DBG_TT, bat_priv,
1481 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1482 res_dst_orig_node->orig, neigh_node->addr,
1483 req_dst_orig_node->orig, req_ttvn);
1484
1485 batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
1486
1487 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1488 ret = true;
1489 goto out;
1490
1491 unlock:
1492 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1493
1494 out:
1495 if (res_dst_orig_node)
1496 orig_node_free_ref(res_dst_orig_node);
1497 if (req_dst_orig_node)
1498 orig_node_free_ref(req_dst_orig_node);
1499 if (neigh_node)
1500 neigh_node_free_ref(neigh_node);
1501 if (primary_if)
1502 hardif_free_ref(primary_if);
1503 if (!ret)
1504 kfree_skb(skb);
1505 return ret;
1506
1507 }
1508 static bool send_my_tt_response(struct bat_priv *bat_priv,
1509 struct tt_query_packet *tt_request)
1510 {
1511 struct orig_node *orig_node = NULL;
1512 struct neigh_node *neigh_node = NULL;
1513 struct hard_iface *primary_if = NULL;
1514 uint8_t my_ttvn, req_ttvn, ttvn;
1515 int ret = false;
1516 unsigned char *tt_buff;
1517 bool full_table;
1518 uint16_t tt_len, tt_tot;
1519 struct sk_buff *skb = NULL;
1520 struct tt_query_packet *tt_response;
1521
1522 bat_dbg(DBG_TT, bat_priv,
1523 "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
1524 tt_request->src, tt_request->ttvn,
1525 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1526
1527
1528 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1529 req_ttvn = tt_request->ttvn;
1530
1531 orig_node = orig_hash_find(bat_priv, tt_request->src);
1532 if (!orig_node)
1533 goto out;
1534
1535 neigh_node = orig_node_get_router(orig_node);
1536 if (!neigh_node)
1537 goto out;
1538
1539 primary_if = primary_if_get_selected(bat_priv);
1540 if (!primary_if)
1541 goto out;
1542
1543 /* If the full table has been explicitly requested or the gap
1544 * is too big send the whole local translation table */
1545 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1546 !bat_priv->tt_buff)
1547 full_table = true;
1548 else
1549 full_table = false;
1550
1551 /* In this version, fragmentation is not implemented, then
1552 * I'll send only one packet with as much TT entries as I can */
1553 if (!full_table) {
1554 spin_lock_bh(&bat_priv->tt_buff_lock);
1555 tt_len = bat_priv->tt_buff_len;
1556 tt_tot = tt_len / sizeof(struct tt_change);
1557
1558 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1559 tt_len + ETH_HLEN);
1560 if (!skb)
1561 goto unlock;
1562
1563 skb_reserve(skb, ETH_HLEN);
1564 tt_response = (struct tt_query_packet *)skb_put(skb,
1565 sizeof(struct tt_query_packet) + tt_len);
1566 tt_response->ttvn = req_ttvn;
1567 tt_response->tt_data = htons(tt_tot);
1568
1569 tt_buff = skb->data + sizeof(struct tt_query_packet);
1570 memcpy(tt_buff, bat_priv->tt_buff,
1571 bat_priv->tt_buff_len);
1572 spin_unlock_bh(&bat_priv->tt_buff_lock);
1573 } else {
1574 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1575 sizeof(struct tt_change);
1576 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1577
1578 skb = tt_response_fill_table(tt_len, ttvn,
1579 bat_priv->tt_local_hash,
1580 primary_if, tt_local_valid_entry,
1581 NULL);
1582 if (!skb)
1583 goto out;
1584
1585 tt_response = (struct tt_query_packet *)skb->data;
1586 }
1587
1588 tt_response->header.packet_type = BAT_TT_QUERY;
1589 tt_response->header.version = COMPAT_VERSION;
1590 tt_response->header.ttl = TTL;
1591 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1592 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1593 tt_response->flags = TT_RESPONSE;
1594
1595 if (full_table)
1596 tt_response->flags |= TT_FULL_TABLE;
1597
1598 bat_dbg(DBG_TT, bat_priv,
1599 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1600 orig_node->orig, neigh_node->addr,
1601 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1602
1603 batadv_inc_counter(bat_priv, BAT_CNT_TT_RESPONSE_TX);
1604
1605 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1606 ret = true;
1607 goto out;
1608
1609 unlock:
1610 spin_unlock_bh(&bat_priv->tt_buff_lock);
1611 out:
1612 if (orig_node)
1613 orig_node_free_ref(orig_node);
1614 if (neigh_node)
1615 neigh_node_free_ref(neigh_node);
1616 if (primary_if)
1617 hardif_free_ref(primary_if);
1618 if (!ret)
1619 kfree_skb(skb);
1620 /* This packet was for me, so it doesn't need to be re-routed */
1621 return true;
1622 }
1623
1624 bool send_tt_response(struct bat_priv *bat_priv,
1625 struct tt_query_packet *tt_request)
1626 {
1627 if (is_my_mac(tt_request->dst)) {
1628 /* don't answer backbone gws! */
1629 if (bla_is_backbone_gw_orig(bat_priv, tt_request->src))
1630 return true;
1631
1632 return send_my_tt_response(bat_priv, tt_request);
1633 } else {
1634 return send_other_tt_response(bat_priv, tt_request);
1635 }
1636 }
1637
1638 static void _tt_update_changes(struct bat_priv *bat_priv,
1639 struct orig_node *orig_node,
1640 struct tt_change *tt_change,
1641 uint16_t tt_num_changes, uint8_t ttvn)
1642 {
1643 int i;
1644
1645 for (i = 0; i < tt_num_changes; i++) {
1646 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1647 tt_global_del(bat_priv, orig_node,
1648 (tt_change + i)->addr,
1649 "tt removed by changes",
1650 (tt_change + i)->flags & TT_CLIENT_ROAM);
1651 else
1652 if (!tt_global_add(bat_priv, orig_node,
1653 (tt_change + i)->addr, ttvn, false,
1654 (tt_change + i)->flags &
1655 TT_CLIENT_WIFI))
1656 /* In case of problem while storing a
1657 * global_entry, we stop the updating
1658 * procedure without committing the
1659 * ttvn change. This will avoid to send
1660 * corrupted data on tt_request
1661 */
1662 return;
1663 }
1664 orig_node->tt_initialised = true;
1665 }
1666
1667 static void tt_fill_gtable(struct bat_priv *bat_priv,
1668 struct tt_query_packet *tt_response)
1669 {
1670 struct orig_node *orig_node = NULL;
1671
1672 orig_node = orig_hash_find(bat_priv, tt_response->src);
1673 if (!orig_node)
1674 goto out;
1675
1676 /* Purge the old table first.. */
1677 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1678
1679 _tt_update_changes(bat_priv, orig_node,
1680 (struct tt_change *)(tt_response + 1),
1681 ntohs(tt_response->tt_data), tt_response->ttvn);
1682
1683 spin_lock_bh(&orig_node->tt_buff_lock);
1684 kfree(orig_node->tt_buff);
1685 orig_node->tt_buff_len = 0;
1686 orig_node->tt_buff = NULL;
1687 spin_unlock_bh(&orig_node->tt_buff_lock);
1688
1689 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1690
1691 out:
1692 if (orig_node)
1693 orig_node_free_ref(orig_node);
1694 }
1695
1696 static void tt_update_changes(struct bat_priv *bat_priv,
1697 struct orig_node *orig_node,
1698 uint16_t tt_num_changes, uint8_t ttvn,
1699 struct tt_change *tt_change)
1700 {
1701 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1702 ttvn);
1703
1704 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1705 tt_num_changes);
1706 atomic_set(&orig_node->last_ttvn, ttvn);
1707 }
1708
1709 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1710 {
1711 struct tt_local_entry *tt_local_entry = NULL;
1712 bool ret = false;
1713
1714 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1715 if (!tt_local_entry)
1716 goto out;
1717 /* Check if the client has been logically deleted (but is kept for
1718 * consistency purpose) */
1719 if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
1720 goto out;
1721 ret = true;
1722 out:
1723 if (tt_local_entry)
1724 tt_local_entry_free_ref(tt_local_entry);
1725 return ret;
1726 }
1727
1728 void handle_tt_response(struct bat_priv *bat_priv,
1729 struct tt_query_packet *tt_response)
1730 {
1731 struct tt_req_node *node, *safe;
1732 struct orig_node *orig_node = NULL;
1733
1734 bat_dbg(DBG_TT, bat_priv,
1735 "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
1736 tt_response->src, tt_response->ttvn,
1737 ntohs(tt_response->tt_data),
1738 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1739
1740 /* we should have never asked a backbone gw */
1741 if (bla_is_backbone_gw_orig(bat_priv, tt_response->src))
1742 goto out;
1743
1744 orig_node = orig_hash_find(bat_priv, tt_response->src);
1745 if (!orig_node)
1746 goto out;
1747
1748 if (tt_response->flags & TT_FULL_TABLE)
1749 tt_fill_gtable(bat_priv, tt_response);
1750 else
1751 tt_update_changes(bat_priv, orig_node,
1752 ntohs(tt_response->tt_data),
1753 tt_response->ttvn,
1754 (struct tt_change *)(tt_response + 1));
1755
1756 /* Delete the tt_req_node from pending tt_requests list */
1757 spin_lock_bh(&bat_priv->tt_req_list_lock);
1758 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1759 if (!compare_eth(node->addr, tt_response->src))
1760 continue;
1761 list_del(&node->list);
1762 kfree(node);
1763 }
1764 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1765
1766 /* Recalculate the CRC for this orig_node and store it */
1767 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1768 /* Roaming phase is over: tables are in sync again. I can
1769 * unset the flag */
1770 orig_node->tt_poss_change = false;
1771 out:
1772 if (orig_node)
1773 orig_node_free_ref(orig_node);
1774 }
1775
1776 int tt_init(struct bat_priv *bat_priv)
1777 {
1778 int ret;
1779
1780 ret = tt_local_init(bat_priv);
1781 if (ret < 0)
1782 return ret;
1783
1784 ret = tt_global_init(bat_priv);
1785 if (ret < 0)
1786 return ret;
1787
1788 tt_start_timer(bat_priv);
1789
1790 return 1;
1791 }
1792
1793 static void tt_roam_list_free(struct bat_priv *bat_priv)
1794 {
1795 struct tt_roam_node *node, *safe;
1796
1797 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1798
1799 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1800 list_del(&node->list);
1801 kfree(node);
1802 }
1803
1804 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1805 }
1806
1807 static void tt_roam_purge(struct bat_priv *bat_priv)
1808 {
1809 struct tt_roam_node *node, *safe;
1810
1811 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1812 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1813 if (!has_timed_out(node->first_time, ROAMING_MAX_TIME))
1814 continue;
1815
1816 list_del(&node->list);
1817 kfree(node);
1818 }
1819 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1820 }
1821
1822 /* This function checks whether the client already reached the
1823 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1824 * will not be sent.
1825 *
1826 * returns true if the ROAMING_ADV can be sent, false otherwise */
1827 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1828 uint8_t *client)
1829 {
1830 struct tt_roam_node *tt_roam_node;
1831 bool ret = false;
1832
1833 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1834 /* The new tt_req will be issued only if I'm not waiting for a
1835 * reply from the same orig_node yet */
1836 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1837 if (!compare_eth(tt_roam_node->addr, client))
1838 continue;
1839
1840 if (has_timed_out(tt_roam_node->first_time, ROAMING_MAX_TIME))
1841 continue;
1842
1843 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1844 /* Sorry, you roamed too many times! */
1845 goto unlock;
1846 ret = true;
1847 break;
1848 }
1849
1850 if (!ret) {
1851 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1852 if (!tt_roam_node)
1853 goto unlock;
1854
1855 tt_roam_node->first_time = jiffies;
1856 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1857 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1858
1859 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1860 ret = true;
1861 }
1862
1863 unlock:
1864 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1865 return ret;
1866 }
1867
1868 static void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1869 struct orig_node *orig_node)
1870 {
1871 struct neigh_node *neigh_node = NULL;
1872 struct sk_buff *skb = NULL;
1873 struct roam_adv_packet *roam_adv_packet;
1874 int ret = 1;
1875 struct hard_iface *primary_if;
1876
1877 /* before going on we have to check whether the client has
1878 * already roamed to us too many times */
1879 if (!tt_check_roam_count(bat_priv, client))
1880 goto out;
1881
1882 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1883 if (!skb)
1884 goto out;
1885
1886 skb_reserve(skb, ETH_HLEN);
1887
1888 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1889 sizeof(struct roam_adv_packet));
1890
1891 roam_adv_packet->header.packet_type = BAT_ROAM_ADV;
1892 roam_adv_packet->header.version = COMPAT_VERSION;
1893 roam_adv_packet->header.ttl = TTL;
1894 primary_if = primary_if_get_selected(bat_priv);
1895 if (!primary_if)
1896 goto out;
1897 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1898 hardif_free_ref(primary_if);
1899 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1900 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1901
1902 neigh_node = orig_node_get_router(orig_node);
1903 if (!neigh_node)
1904 goto out;
1905
1906 bat_dbg(DBG_TT, bat_priv,
1907 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1908 orig_node->orig, client, neigh_node->addr);
1909
1910 batadv_inc_counter(bat_priv, BAT_CNT_TT_ROAM_ADV_TX);
1911
1912 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1913 ret = 0;
1914
1915 out:
1916 if (neigh_node)
1917 neigh_node_free_ref(neigh_node);
1918 if (ret)
1919 kfree_skb(skb);
1920 return;
1921 }
1922
1923 static void tt_purge(struct work_struct *work)
1924 {
1925 struct delayed_work *delayed_work =
1926 container_of(work, struct delayed_work, work);
1927 struct bat_priv *bat_priv =
1928 container_of(delayed_work, struct bat_priv, tt_work);
1929
1930 tt_local_purge(bat_priv);
1931 tt_global_roam_purge(bat_priv);
1932 tt_req_purge(bat_priv);
1933 tt_roam_purge(bat_priv);
1934
1935 tt_start_timer(bat_priv);
1936 }
1937
1938 void tt_free(struct bat_priv *bat_priv)
1939 {
1940 cancel_delayed_work_sync(&bat_priv->tt_work);
1941
1942 tt_local_table_free(bat_priv);
1943 tt_global_table_free(bat_priv);
1944 tt_req_list_free(bat_priv);
1945 tt_changes_list_free(bat_priv);
1946 tt_roam_list_free(bat_priv);
1947
1948 kfree(bat_priv->tt_buff);
1949 }
1950
1951 /* This function will enable or disable the specified flags for all the entries
1952 * in the given hash table and returns the number of modified entries */
1953 static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags,
1954 bool enable)
1955 {
1956 uint32_t i;
1957 uint16_t changed_num = 0;
1958 struct hlist_head *head;
1959 struct hlist_node *node;
1960 struct tt_common_entry *tt_common_entry;
1961
1962 if (!hash)
1963 goto out;
1964
1965 for (i = 0; i < hash->size; i++) {
1966 head = &hash->table[i];
1967
1968 rcu_read_lock();
1969 hlist_for_each_entry_rcu(tt_common_entry, node,
1970 head, hash_entry) {
1971 if (enable) {
1972 if ((tt_common_entry->flags & flags) == flags)
1973 continue;
1974 tt_common_entry->flags |= flags;
1975 } else {
1976 if (!(tt_common_entry->flags & flags))
1977 continue;
1978 tt_common_entry->flags &= ~flags;
1979 }
1980 changed_num++;
1981 }
1982 rcu_read_unlock();
1983 }
1984 out:
1985 return changed_num;
1986 }
1987
1988 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1989 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1990 {
1991 struct hashtable_t *hash = bat_priv->tt_local_hash;
1992 struct tt_common_entry *tt_common_entry;
1993 struct tt_local_entry *tt_local_entry;
1994 struct hlist_node *node, *node_tmp;
1995 struct hlist_head *head;
1996 spinlock_t *list_lock; /* protects write access to the hash lists */
1997 uint32_t i;
1998
1999 if (!hash)
2000 return;
2001
2002 for (i = 0; i < hash->size; i++) {
2003 head = &hash->table[i];
2004 list_lock = &hash->list_locks[i];
2005
2006 spin_lock_bh(list_lock);
2007 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
2008 head, hash_entry) {
2009 if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
2010 continue;
2011
2012 bat_dbg(DBG_TT, bat_priv,
2013 "Deleting local tt entry (%pM): pending\n",
2014 tt_common_entry->addr);
2015
2016 atomic_dec(&bat_priv->num_local_tt);
2017 hlist_del_rcu(node);
2018 tt_local_entry = container_of(tt_common_entry,
2019 struct tt_local_entry,
2020 common);
2021 tt_local_entry_free_ref(tt_local_entry);
2022 }
2023 spin_unlock_bh(list_lock);
2024 }
2025
2026 }
2027
2028 void tt_commit_changes(struct bat_priv *bat_priv)
2029 {
2030 uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash,
2031 TT_CLIENT_NEW, false);
2032 /* all the reset entries have now to be effectively counted as local
2033 * entries */
2034 atomic_add(changed_num, &bat_priv->num_local_tt);
2035 tt_local_purge_pending_clients(bat_priv);
2036
2037 /* Increment the TTVN only once per OGM interval */
2038 atomic_inc(&bat_priv->ttvn);
2039 bat_dbg(DBG_TT, bat_priv, "Local changes committed, updating to ttvn %u\n",
2040 (uint8_t)atomic_read(&bat_priv->ttvn));
2041 bat_priv->tt_poss_change = false;
2042 }
2043
2044 bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
2045 {
2046 struct tt_local_entry *tt_local_entry = NULL;
2047 struct tt_global_entry *tt_global_entry = NULL;
2048 bool ret = true;
2049
2050 if (!atomic_read(&bat_priv->ap_isolation))
2051 return false;
2052
2053 tt_local_entry = tt_local_hash_find(bat_priv, dst);
2054 if (!tt_local_entry)
2055 goto out;
2056
2057 tt_global_entry = tt_global_hash_find(bat_priv, src);
2058 if (!tt_global_entry)
2059 goto out;
2060
2061 if (_is_ap_isolated(tt_local_entry, tt_global_entry))
2062 goto out;
2063
2064 ret = false;
2065
2066 out:
2067 if (tt_global_entry)
2068 tt_global_entry_free_ref(tt_global_entry);
2069 if (tt_local_entry)
2070 tt_local_entry_free_ref(tt_local_entry);
2071 return ret;
2072 }
2073
2074 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
2075 const unsigned char *tt_buff, uint8_t tt_num_changes,
2076 uint8_t ttvn, uint16_t tt_crc)
2077 {
2078 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
2079 bool full_table = true;
2080
2081 /* don't care about a backbone gateways updates. */
2082 if (bla_is_backbone_gw_orig(bat_priv, orig_node->orig))
2083 return;
2084
2085 /* orig table not initialised AND first diff is in the OGM OR the ttvn
2086 * increased by one -> we can apply the attached changes */
2087 if ((!orig_node->tt_initialised && ttvn == 1) ||
2088 ttvn - orig_ttvn == 1) {
2089 /* the OGM could not contain the changes due to their size or
2090 * because they have already been sent TT_OGM_APPEND_MAX times.
2091 * In this case send a tt request */
2092 if (!tt_num_changes) {
2093 full_table = false;
2094 goto request_table;
2095 }
2096
2097 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
2098 (struct tt_change *)tt_buff);
2099
2100 /* Even if we received the precomputed crc with the OGM, we
2101 * prefer to recompute it to spot any possible inconsistency
2102 * in the global table */
2103 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
2104
2105 /* The ttvn alone is not enough to guarantee consistency
2106 * because a single value could represent different states
2107 * (due to the wrap around). Thus a node has to check whether
2108 * the resulting table (after applying the changes) is still
2109 * consistent or not. E.g. a node could disconnect while its
2110 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
2111 * checking the CRC value is mandatory to detect the
2112 * inconsistency */
2113 if (orig_node->tt_crc != tt_crc)
2114 goto request_table;
2115
2116 /* Roaming phase is over: tables are in sync again. I can
2117 * unset the flag */
2118 orig_node->tt_poss_change = false;
2119 } else {
2120 /* if we missed more than one change or our tables are not
2121 * in sync anymore -> request fresh tt data */
2122
2123 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
2124 orig_node->tt_crc != tt_crc) {
2125 request_table:
2126 bat_dbg(DBG_TT, bat_priv,
2127 "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u crc: %u last_crc: %u num_changes: %u)\n",
2128 orig_node->orig, ttvn, orig_ttvn, tt_crc,
2129 orig_node->tt_crc, tt_num_changes);
2130 send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
2131 full_table);
2132 return;
2133 }
2134 }
2135 }
2136
2137 /* returns true whether we know that the client has moved from its old
2138 * originator to another one. This entry is kept is still kept for consistency
2139 * purposes
2140 */
2141 bool tt_global_client_is_roaming(struct bat_priv *bat_priv, uint8_t *addr)
2142 {
2143 struct tt_global_entry *tt_global_entry;
2144 bool ret = false;
2145
2146 tt_global_entry = tt_global_hash_find(bat_priv, addr);
2147 if (!tt_global_entry)
2148 goto out;
2149
2150 ret = tt_global_entry->common.flags & TT_CLIENT_ROAM;
2151 tt_global_entry_free_ref(tt_global_entry);
2152 out:
2153 return ret;
2154 }
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