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hfs: fix hfs_find_init() sb->ext_tree NULL ptr oops
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / batman-adv / translation-table.c
blobd58fd8b9c818008b57d65a15cf65fa1841f1bba2
1 /*
2 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
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
31 #include <linux/crc16.h>
32
33 static void _tt_global_del(struct bat_priv *bat_priv,
34 struct tt_global_entry *tt_global_entry,
35 const char *message);
36 static void tt_purge(struct work_struct *work);
37
38 /* returns 1 if they are the same mac addr */
39 static int compare_ltt(const struct hlist_node *node, const void *data2)
40 {
41 const void *data1 = container_of(node, struct tt_local_entry,
42 hash_entry);
43
44 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
45 }
46
47 /* returns 1 if they are the same mac addr */
48 static int compare_gtt(const struct hlist_node *node, const void *data2)
49 {
50 const void *data1 = container_of(node, struct tt_global_entry,
51 hash_entry);
52
53 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
54 }
55
56 static void tt_start_timer(struct bat_priv *bat_priv)
57 {
58 INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
59 queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
60 msecs_to_jiffies(5000));
61 }
62
63 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
64 const void *data)
65 {
66 struct hashtable_t *hash = bat_priv->tt_local_hash;
67 struct hlist_head *head;
68 struct hlist_node *node;
69 struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL;
70 int index;
71
72 if (!hash)
73 return NULL;
74
75 index = choose_orig(data, hash->size);
76 head = &hash->table[index];
77
78 rcu_read_lock();
79 hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) {
80 if (!compare_eth(tt_local_entry, data))
81 continue;
82
83 if (!atomic_inc_not_zero(&tt_local_entry->refcount))
84 continue;
85
86 tt_local_entry_tmp = tt_local_entry;
87 break;
88 }
89 rcu_read_unlock();
90
91 return tt_local_entry_tmp;
92 }
93
94 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
95 const void *data)
96 {
97 struct hashtable_t *hash = bat_priv->tt_global_hash;
98 struct hlist_head *head;
99 struct hlist_node *node;
100 struct tt_global_entry *tt_global_entry;
101 struct tt_global_entry *tt_global_entry_tmp = NULL;
102 int index;
103
104 if (!hash)
105 return NULL;
106
107 index = choose_orig(data, hash->size);
108 head = &hash->table[index];
109
110 rcu_read_lock();
111 hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) {
112 if (!compare_eth(tt_global_entry, data))
113 continue;
114
115 if (!atomic_inc_not_zero(&tt_global_entry->refcount))
116 continue;
117
118 tt_global_entry_tmp = tt_global_entry;
119 break;
120 }
121 rcu_read_unlock();
122
123 return tt_global_entry_tmp;
124 }
125
126 static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
127 {
128 unsigned long deadline;
129 deadline = starting_time + msecs_to_jiffies(timeout);
130
131 return time_after(jiffies, deadline);
132 }
133
134 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
135 {
136 if (atomic_dec_and_test(&tt_local_entry->refcount))
137 kfree_rcu(tt_local_entry, rcu);
138 }
139
140 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
141 {
142 struct tt_global_entry *tt_global_entry;
143
144 tt_global_entry = container_of(rcu, struct tt_global_entry, rcu);
145
146 if (tt_global_entry->orig_node)
147 orig_node_free_ref(tt_global_entry->orig_node);
148
149 kfree(tt_global_entry);
150 }
151
152 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
153 {
154 if (atomic_dec_and_test(&tt_global_entry->refcount))
155 call_rcu(&tt_global_entry->rcu, tt_global_entry_free_rcu);
156 }
157
158 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
159 uint8_t flags)
160 {
161 struct tt_change_node *tt_change_node;
162
163 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
164
165 if (!tt_change_node)
166 return;
167
168 tt_change_node->change.flags = flags;
169 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
170
171 spin_lock_bh(&bat_priv->tt_changes_list_lock);
172 /* track the change in the OGMinterval list */
173 list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
174 atomic_inc(&bat_priv->tt_local_changes);
175 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
176
177 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
178 }
179
180 int tt_len(int changes_num)
181 {
182 return changes_num * sizeof(struct tt_change);
183 }
184
185 static int tt_local_init(struct bat_priv *bat_priv)
186 {
187 if (bat_priv->tt_local_hash)
188 return 1;
189
190 bat_priv->tt_local_hash = hash_new(1024);
191
192 if (!bat_priv->tt_local_hash)
193 return 0;
194
195 return 1;
196 }
197
198 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
199 {
200 struct bat_priv *bat_priv = netdev_priv(soft_iface);
201 struct tt_local_entry *tt_local_entry = NULL;
202 struct tt_global_entry *tt_global_entry = NULL;
203
204 tt_local_entry = tt_local_hash_find(bat_priv, addr);
205
206 if (tt_local_entry) {
207 tt_local_entry->last_seen = jiffies;
208 goto out;
209 }
210
211 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
212 if (!tt_local_entry)
213 goto out;
214
215 bat_dbg(DBG_TT, bat_priv,
216 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
217 (uint8_t)atomic_read(&bat_priv->ttvn));
218
219 memcpy(tt_local_entry->addr, addr, ETH_ALEN);
220 tt_local_entry->last_seen = jiffies;
221 tt_local_entry->flags = NO_FLAGS;
222 atomic_set(&tt_local_entry->refcount, 2);
223
224 /* the batman interface mac address should never be purged */
225 if (compare_eth(addr, soft_iface->dev_addr))
226 tt_local_entry->flags |= TT_CLIENT_NOPURGE;
227
228 tt_local_event(bat_priv, addr, tt_local_entry->flags);
229
230 /* The local entry has to be marked as NEW to avoid to send it in
231 * a full table response going out before the next ttvn increment
232 * (consistency check) */
233 tt_local_entry->flags |= TT_CLIENT_NEW;
234
235 hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
236 tt_local_entry, &tt_local_entry->hash_entry);
237
238 /* remove address from global hash if present */
239 tt_global_entry = tt_global_hash_find(bat_priv, addr);
240
241 /* Check whether it is a roaming! */
242 if (tt_global_entry) {
243 /* This node is probably going to update its tt table */
244 tt_global_entry->orig_node->tt_poss_change = true;
245 /* The global entry has to be marked as PENDING and has to be
246 * kept for consistency purpose */
247 tt_global_entry->flags |= TT_CLIENT_PENDING;
248 send_roam_adv(bat_priv, tt_global_entry->addr,
249 tt_global_entry->orig_node);
250 }
251 out:
252 if (tt_local_entry)
253 tt_local_entry_free_ref(tt_local_entry);
254 if (tt_global_entry)
255 tt_global_entry_free_ref(tt_global_entry);
256 }
257
258 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
259 unsigned char *buff, int buff_len)
260 {
261 int count = 0, tot_changes = 0;
262 struct tt_change_node *entry, *safe;
263
264 if (buff_len > 0)
265 tot_changes = buff_len / tt_len(1);
266
267 spin_lock_bh(&bat_priv->tt_changes_list_lock);
268 atomic_set(&bat_priv->tt_local_changes, 0);
269
270 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
271 list) {
272 if (count < tot_changes) {
273 memcpy(buff + tt_len(count),
274 &entry->change, sizeof(struct tt_change));
275 count++;
276 }
277 list_del(&entry->list);
278 kfree(entry);
279 }
280 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
281
282 /* Keep the buffer for possible tt_request */
283 spin_lock_bh(&bat_priv->tt_buff_lock);
284 kfree(bat_priv->tt_buff);
285 bat_priv->tt_buff_len = 0;
286 bat_priv->tt_buff = NULL;
287 /* We check whether this new OGM has no changes due to size
288 * problems */
289 if (buff_len > 0) {
290 /**
291 * if kmalloc() fails we will reply with the full table
292 * instead of providing the diff
293 */
294 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
295 if (bat_priv->tt_buff) {
296 memcpy(bat_priv->tt_buff, buff, buff_len);
297 bat_priv->tt_buff_len = buff_len;
298 }
299 }
300 spin_unlock_bh(&bat_priv->tt_buff_lock);
301
302 return tot_changes;
303 }
304
305 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
306 {
307 struct net_device *net_dev = (struct net_device *)seq->private;
308 struct bat_priv *bat_priv = netdev_priv(net_dev);
309 struct hashtable_t *hash = bat_priv->tt_local_hash;
310 struct tt_local_entry *tt_local_entry;
311 struct hard_iface *primary_if;
312 struct hlist_node *node;
313 struct hlist_head *head;
314 size_t buf_size, pos;
315 char *buff;
316 int i, ret = 0;
317
318 primary_if = primary_if_get_selected(bat_priv);
319 if (!primary_if) {
320 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
321 "please specify interfaces to enable it\n",
322 net_dev->name);
323 goto out;
324 }
325
326 if (primary_if->if_status != IF_ACTIVE) {
327 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
328 "primary interface not active\n",
329 net_dev->name);
330 goto out;
331 }
332
333 seq_printf(seq, "Locally retrieved addresses (from %s) "
334 "announced via TT (TTVN: %u):\n",
335 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
336
337 buf_size = 1;
338 /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
339 for (i = 0; i < hash->size; i++) {
340 head = &hash->table[i];
341
342 rcu_read_lock();
343 __hlist_for_each_rcu(node, head)
344 buf_size += 21;
345 rcu_read_unlock();
346 }
347
348 buff = kmalloc(buf_size, GFP_ATOMIC);
349 if (!buff) {
350 ret = -ENOMEM;
351 goto out;
352 }
353
354 buff[0] = '\0';
355 pos = 0;
356
357 for (i = 0; i < hash->size; i++) {
358 head = &hash->table[i];
359
360 rcu_read_lock();
361 hlist_for_each_entry_rcu(tt_local_entry, node,
362 head, hash_entry) {
363 pos += snprintf(buff + pos, 22, " * %pM\n",
364 tt_local_entry->addr);
365 }
366 rcu_read_unlock();
367 }
368
369 seq_printf(seq, "%s", buff);
370 kfree(buff);
371 out:
372 if (primary_if)
373 hardif_free_ref(primary_if);
374 return ret;
375 }
376
377 static void tt_local_set_pending(struct bat_priv *bat_priv,
378 struct tt_local_entry *tt_local_entry,
379 uint16_t flags)
380 {
381 tt_local_event(bat_priv, tt_local_entry->addr,
382 tt_local_entry->flags | flags);
383
384 /* The local client has to be merked as "pending to be removed" but has
385 * to be kept in the table in order to send it in an full tables
386 * response issued before the net ttvn increment (consistency check) */
387 tt_local_entry->flags |= TT_CLIENT_PENDING;
388 }
389
390 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
391 const char *message, bool roaming)
392 {
393 struct tt_local_entry *tt_local_entry = NULL;
394
395 tt_local_entry = tt_local_hash_find(bat_priv, addr);
396 if (!tt_local_entry)
397 goto out;
398
399 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
400 (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
401
402 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
403 "%s\n", tt_local_entry->addr, message);
404 out:
405 if (tt_local_entry)
406 tt_local_entry_free_ref(tt_local_entry);
407 }
408
409 static void tt_local_purge(struct bat_priv *bat_priv)
410 {
411 struct hashtable_t *hash = bat_priv->tt_local_hash;
412 struct tt_local_entry *tt_local_entry;
413 struct hlist_node *node, *node_tmp;
414 struct hlist_head *head;
415 spinlock_t *list_lock; /* protects write access to the hash lists */
416 int i;
417
418 for (i = 0; i < hash->size; i++) {
419 head = &hash->table[i];
420 list_lock = &hash->list_locks[i];
421
422 spin_lock_bh(list_lock);
423 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
424 head, hash_entry) {
425 if (tt_local_entry->flags & TT_CLIENT_NOPURGE)
426 continue;
427
428 /* entry already marked for deletion */
429 if (tt_local_entry->flags & TT_CLIENT_PENDING)
430 continue;
431
432 if (!is_out_of_time(tt_local_entry->last_seen,
433 TT_LOCAL_TIMEOUT * 1000))
434 continue;
435
436 tt_local_set_pending(bat_priv, tt_local_entry,
437 TT_CLIENT_DEL);
438 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
439 "pending to be removed: timed out\n",
440 tt_local_entry->addr);
441 }
442 spin_unlock_bh(list_lock);
443 }
444
445 }
446
447 static void tt_local_table_free(struct bat_priv *bat_priv)
448 {
449 struct hashtable_t *hash;
450 spinlock_t *list_lock; /* protects write access to the hash lists */
451 struct tt_local_entry *tt_local_entry;
452 struct hlist_node *node, *node_tmp;
453 struct hlist_head *head;
454 int i;
455
456 if (!bat_priv->tt_local_hash)
457 return;
458
459 hash = bat_priv->tt_local_hash;
460
461 for (i = 0; i < hash->size; i++) {
462 head = &hash->table[i];
463 list_lock = &hash->list_locks[i];
464
465 spin_lock_bh(list_lock);
466 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
467 head, hash_entry) {
468 hlist_del_rcu(node);
469 tt_local_entry_free_ref(tt_local_entry);
470 }
471 spin_unlock_bh(list_lock);
472 }
473
474 hash_destroy(hash);
475
476 bat_priv->tt_local_hash = NULL;
477 }
478
479 static int tt_global_init(struct bat_priv *bat_priv)
480 {
481 if (bat_priv->tt_global_hash)
482 return 1;
483
484 bat_priv->tt_global_hash = hash_new(1024);
485
486 if (!bat_priv->tt_global_hash)
487 return 0;
488
489 return 1;
490 }
491
492 static void tt_changes_list_free(struct bat_priv *bat_priv)
493 {
494 struct tt_change_node *entry, *safe;
495
496 spin_lock_bh(&bat_priv->tt_changes_list_lock);
497
498 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
499 list) {
500 list_del(&entry->list);
501 kfree(entry);
502 }
503
504 atomic_set(&bat_priv->tt_local_changes, 0);
505 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
506 }
507
508 /* caller must hold orig_node refcount */
509 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
510 const unsigned char *tt_addr, uint8_t ttvn, bool roaming)
511 {
512 struct tt_global_entry *tt_global_entry;
513 struct orig_node *orig_node_tmp;
514 int ret = 0;
515
516 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
517
518 if (!tt_global_entry) {
519 tt_global_entry =
520 kmalloc(sizeof(*tt_global_entry),
521 GFP_ATOMIC);
522 if (!tt_global_entry)
523 goto out;
524
525 memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
526 /* Assign the new orig_node */
527 atomic_inc(&orig_node->refcount);
528 tt_global_entry->orig_node = orig_node;
529 tt_global_entry->ttvn = ttvn;
530 tt_global_entry->flags = NO_FLAGS;
531 tt_global_entry->roam_at = 0;
532 atomic_set(&tt_global_entry->refcount, 2);
533
534 hash_add(bat_priv->tt_global_hash, compare_gtt,
535 choose_orig, tt_global_entry,
536 &tt_global_entry->hash_entry);
537 atomic_inc(&orig_node->tt_size);
538 } else {
539 if (tt_global_entry->orig_node != orig_node) {
540 atomic_dec(&tt_global_entry->orig_node->tt_size);
541 orig_node_tmp = tt_global_entry->orig_node;
542 atomic_inc(&orig_node->refcount);
543 tt_global_entry->orig_node = orig_node;
544 orig_node_free_ref(orig_node_tmp);
545 atomic_inc(&orig_node->tt_size);
546 }
547 tt_global_entry->ttvn = ttvn;
548 tt_global_entry->flags = NO_FLAGS;
549 tt_global_entry->roam_at = 0;
550 }
551
552 bat_dbg(DBG_TT, bat_priv,
553 "Creating new global tt entry: %pM (via %pM)\n",
554 tt_global_entry->addr, orig_node->orig);
555
556 /* remove address from local hash if present */
557 tt_local_remove(bat_priv, tt_global_entry->addr,
558 "global tt received", roaming);
559 ret = 1;
560 out:
561 if (tt_global_entry)
562 tt_global_entry_free_ref(tt_global_entry);
563 return ret;
564 }
565
566 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
567 {
568 struct net_device *net_dev = (struct net_device *)seq->private;
569 struct bat_priv *bat_priv = netdev_priv(net_dev);
570 struct hashtable_t *hash = bat_priv->tt_global_hash;
571 struct tt_global_entry *tt_global_entry;
572 struct hard_iface *primary_if;
573 struct hlist_node *node;
574 struct hlist_head *head;
575 size_t buf_size, pos;
576 char *buff;
577 int i, ret = 0;
578
579 primary_if = primary_if_get_selected(bat_priv);
580 if (!primary_if) {
581 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
582 "specify interfaces to enable it\n",
583 net_dev->name);
584 goto out;
585 }
586
587 if (primary_if->if_status != IF_ACTIVE) {
588 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
589 "primary interface not active\n",
590 net_dev->name);
591 goto out;
592 }
593
594 seq_printf(seq,
595 "Globally announced TT entries received via the mesh %s\n",
596 net_dev->name);
597 seq_printf(seq, " %-13s %s %-15s %s\n",
598 "Client", "(TTVN)", "Originator", "(Curr TTVN)");
599
600 buf_size = 1;
601 /* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
602 * xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
603 for (i = 0; i < hash->size; i++) {
604 head = &hash->table[i];
605
606 rcu_read_lock();
607 __hlist_for_each_rcu(node, head)
608 buf_size += 59;
609 rcu_read_unlock();
610 }
611
612 buff = kmalloc(buf_size, GFP_ATOMIC);
613 if (!buff) {
614 ret = -ENOMEM;
615 goto out;
616 }
617
618 buff[0] = '\0';
619 pos = 0;
620
621 for (i = 0; i < hash->size; i++) {
622 head = &hash->table[i];
623
624 rcu_read_lock();
625 hlist_for_each_entry_rcu(tt_global_entry, node,
626 head, hash_entry) {
627 pos += snprintf(buff + pos, 61,
628 " * %pM (%3u) via %pM (%3u)\n",
629 tt_global_entry->addr,
630 tt_global_entry->ttvn,
631 tt_global_entry->orig_node->orig,
632 (uint8_t) atomic_read(
633 &tt_global_entry->orig_node->
634 last_ttvn));
635 }
636 rcu_read_unlock();
637 }
638
639 seq_printf(seq, "%s", buff);
640 kfree(buff);
641 out:
642 if (primary_if)
643 hardif_free_ref(primary_if);
644 return ret;
645 }
646
647 static void _tt_global_del(struct bat_priv *bat_priv,
648 struct tt_global_entry *tt_global_entry,
649 const char *message)
650 {
651 if (!tt_global_entry)
652 goto out;
653
654 bat_dbg(DBG_TT, bat_priv,
655 "Deleting global tt entry %pM (via %pM): %s\n",
656 tt_global_entry->addr, tt_global_entry->orig_node->orig,
657 message);
658
659 atomic_dec(&tt_global_entry->orig_node->tt_size);
660
661 hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
662 tt_global_entry->addr);
663 out:
664 if (tt_global_entry)
665 tt_global_entry_free_ref(tt_global_entry);
666 }
667
668 void tt_global_del(struct bat_priv *bat_priv,
669 struct orig_node *orig_node, const unsigned char *addr,
670 const char *message, bool roaming)
671 {
672 struct tt_global_entry *tt_global_entry = NULL;
673
674 tt_global_entry = tt_global_hash_find(bat_priv, addr);
675 if (!tt_global_entry)
676 goto out;
677
678 if (tt_global_entry->orig_node == orig_node) {
679 if (roaming) {
680 tt_global_entry->flags |= TT_CLIENT_ROAM;
681 tt_global_entry->roam_at = jiffies;
682 goto out;
683 }
684 _tt_global_del(bat_priv, tt_global_entry, message);
685 }
686 out:
687 if (tt_global_entry)
688 tt_global_entry_free_ref(tt_global_entry);
689 }
690
691 void tt_global_del_orig(struct bat_priv *bat_priv,
692 struct orig_node *orig_node, const char *message)
693 {
694 struct tt_global_entry *tt_global_entry;
695 int i;
696 struct hashtable_t *hash = bat_priv->tt_global_hash;
697 struct hlist_node *node, *safe;
698 struct hlist_head *head;
699 spinlock_t *list_lock; /* protects write access to the hash lists */
700
701 if (!hash)
702 return;
703
704 for (i = 0; i < hash->size; i++) {
705 head = &hash->table[i];
706 list_lock = &hash->list_locks[i];
707
708 spin_lock_bh(list_lock);
709 hlist_for_each_entry_safe(tt_global_entry, node, safe,
710 head, hash_entry) {
711 if (tt_global_entry->orig_node == orig_node) {
712 bat_dbg(DBG_TT, bat_priv,
713 "Deleting global tt entry %pM "
714 "(via %pM): originator time out\n",
715 tt_global_entry->addr,
716 tt_global_entry->orig_node->orig);
717 hlist_del_rcu(node);
718 tt_global_entry_free_ref(tt_global_entry);
719 }
720 }
721 spin_unlock_bh(list_lock);
722 }
723 atomic_set(&orig_node->tt_size, 0);
724 }
725
726 static void tt_global_roam_purge(struct bat_priv *bat_priv)
727 {
728 struct hashtable_t *hash = bat_priv->tt_global_hash;
729 struct tt_global_entry *tt_global_entry;
730 struct hlist_node *node, *node_tmp;
731 struct hlist_head *head;
732 spinlock_t *list_lock; /* protects write access to the hash lists */
733 int i;
734
735 for (i = 0; i < hash->size; i++) {
736 head = &hash->table[i];
737 list_lock = &hash->list_locks[i];
738
739 spin_lock_bh(list_lock);
740 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
741 head, hash_entry) {
742 if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
743 continue;
744 if (!is_out_of_time(tt_global_entry->roam_at,
745 TT_CLIENT_ROAM_TIMEOUT * 1000))
746 continue;
747
748 bat_dbg(DBG_TT, bat_priv, "Deleting global "
749 "tt entry (%pM): Roaming timeout\n",
750 tt_global_entry->addr);
751 atomic_dec(&tt_global_entry->orig_node->tt_size);
752 hlist_del_rcu(node);
753 tt_global_entry_free_ref(tt_global_entry);
754 }
755 spin_unlock_bh(list_lock);
756 }
757
758 }
759
760 static void tt_global_table_free(struct bat_priv *bat_priv)
761 {
762 struct hashtable_t *hash;
763 spinlock_t *list_lock; /* protects write access to the hash lists */
764 struct tt_global_entry *tt_global_entry;
765 struct hlist_node *node, *node_tmp;
766 struct hlist_head *head;
767 int i;
768
769 if (!bat_priv->tt_global_hash)
770 return;
771
772 hash = bat_priv->tt_global_hash;
773
774 for (i = 0; i < hash->size; i++) {
775 head = &hash->table[i];
776 list_lock = &hash->list_locks[i];
777
778 spin_lock_bh(list_lock);
779 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
780 head, hash_entry) {
781 hlist_del_rcu(node);
782 tt_global_entry_free_ref(tt_global_entry);
783 }
784 spin_unlock_bh(list_lock);
785 }
786
787 hash_destroy(hash);
788
789 bat_priv->tt_global_hash = NULL;
790 }
791
792 struct orig_node *transtable_search(struct bat_priv *bat_priv,
793 const uint8_t *addr)
794 {
795 struct tt_global_entry *tt_global_entry;
796 struct orig_node *orig_node = NULL;
797
798 tt_global_entry = tt_global_hash_find(bat_priv, addr);
799
800 if (!tt_global_entry)
801 goto out;
802
803 if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
804 goto free_tt;
805
806 /* A global client marked as PENDING has already moved from that
807 * originator */
808 if (tt_global_entry->flags & TT_CLIENT_PENDING)
809 goto free_tt;
810
811 orig_node = tt_global_entry->orig_node;
812
813 free_tt:
814 tt_global_entry_free_ref(tt_global_entry);
815 out:
816 return orig_node;
817 }
818
819 /* Calculates the checksum of the local table of a given orig_node */
820 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
821 {
822 uint16_t total = 0, total_one;
823 struct hashtable_t *hash = bat_priv->tt_global_hash;
824 struct tt_global_entry *tt_global_entry;
825 struct hlist_node *node;
826 struct hlist_head *head;
827 int i, j;
828
829 for (i = 0; i < hash->size; i++) {
830 head = &hash->table[i];
831
832 rcu_read_lock();
833 hlist_for_each_entry_rcu(tt_global_entry, node,
834 head, hash_entry) {
835 if (compare_eth(tt_global_entry->orig_node,
836 orig_node)) {
837 /* Roaming clients are in the global table for
838 * consistency only. They don't have to be
839 * taken into account while computing the
840 * global crc */
841 if (tt_global_entry->flags & TT_CLIENT_ROAM)
842 continue;
843 total_one = 0;
844 for (j = 0; j < ETH_ALEN; j++)
845 total_one = crc16_byte(total_one,
846 tt_global_entry->addr[j]);
847 total ^= total_one;
848 }
849 }
850 rcu_read_unlock();
851 }
852
853 return total;
854 }
855
856 /* Calculates the checksum of the local table */
857 uint16_t tt_local_crc(struct bat_priv *bat_priv)
858 {
859 uint16_t total = 0, total_one;
860 struct hashtable_t *hash = bat_priv->tt_local_hash;
861 struct tt_local_entry *tt_local_entry;
862 struct hlist_node *node;
863 struct hlist_head *head;
864 int i, j;
865
866 for (i = 0; i < hash->size; i++) {
867 head = &hash->table[i];
868
869 rcu_read_lock();
870 hlist_for_each_entry_rcu(tt_local_entry, node,
871 head, hash_entry) {
872 /* not yet committed clients have not to be taken into
873 * account while computing the CRC */
874 if (tt_local_entry->flags & TT_CLIENT_NEW)
875 continue;
876 total_one = 0;
877 for (j = 0; j < ETH_ALEN; j++)
878 total_one = crc16_byte(total_one,
879 tt_local_entry->addr[j]);
880 total ^= total_one;
881 }
882 rcu_read_unlock();
883 }
884
885 return total;
886 }
887
888 static void tt_req_list_free(struct bat_priv *bat_priv)
889 {
890 struct tt_req_node *node, *safe;
891
892 spin_lock_bh(&bat_priv->tt_req_list_lock);
893
894 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
895 list_del(&node->list);
896 kfree(node);
897 }
898
899 spin_unlock_bh(&bat_priv->tt_req_list_lock);
900 }
901
902 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
903 const unsigned char *tt_buff, uint8_t tt_num_changes)
904 {
905 uint16_t tt_buff_len = tt_len(tt_num_changes);
906
907 /* Replace the old buffer only if I received something in the
908 * last OGM (the OGM could carry no changes) */
909 spin_lock_bh(&orig_node->tt_buff_lock);
910 if (tt_buff_len > 0) {
911 kfree(orig_node->tt_buff);
912 orig_node->tt_buff_len = 0;
913 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
914 if (orig_node->tt_buff) {
915 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
916 orig_node->tt_buff_len = tt_buff_len;
917 }
918 }
919 spin_unlock_bh(&orig_node->tt_buff_lock);
920 }
921
922 static void tt_req_purge(struct bat_priv *bat_priv)
923 {
924 struct tt_req_node *node, *safe;
925
926 spin_lock_bh(&bat_priv->tt_req_list_lock);
927 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
928 if (is_out_of_time(node->issued_at,
929 TT_REQUEST_TIMEOUT * 1000)) {
930 list_del(&node->list);
931 kfree(node);
932 }
933 }
934 spin_unlock_bh(&bat_priv->tt_req_list_lock);
935 }
936
937 /* returns the pointer to the new tt_req_node struct if no request
938 * has already been issued for this orig_node, NULL otherwise */
939 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
940 struct orig_node *orig_node)
941 {
942 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
943
944 spin_lock_bh(&bat_priv->tt_req_list_lock);
945 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
946 if (compare_eth(tt_req_node_tmp, orig_node) &&
947 !is_out_of_time(tt_req_node_tmp->issued_at,
948 TT_REQUEST_TIMEOUT * 1000))
949 goto unlock;
950 }
951
952 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
953 if (!tt_req_node)
954 goto unlock;
955
956 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
957 tt_req_node->issued_at = jiffies;
958
959 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
960 unlock:
961 spin_unlock_bh(&bat_priv->tt_req_list_lock);
962 return tt_req_node;
963 }
964
965 /* data_ptr is useless here, but has to be kept to respect the prototype */
966 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
967 {
968 const struct tt_local_entry *tt_local_entry = entry_ptr;
969
970 if (tt_local_entry->flags & TT_CLIENT_NEW)
971 return 0;
972 return 1;
973 }
974
975 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
976 {
977 const struct tt_global_entry *tt_global_entry = entry_ptr;
978 const struct orig_node *orig_node = data_ptr;
979
980 if (tt_global_entry->flags & TT_CLIENT_ROAM)
981 return 0;
982
983 return (tt_global_entry->orig_node == orig_node);
984 }
985
986 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
987 struct hashtable_t *hash,
988 struct hard_iface *primary_if,
989 int (*valid_cb)(const void *,
990 const void *),
991 void *cb_data)
992 {
993 struct tt_local_entry *tt_local_entry;
994 struct tt_query_packet *tt_response;
995 struct tt_change *tt_change;
996 struct hlist_node *node;
997 struct hlist_head *head;
998 struct sk_buff *skb = NULL;
999 uint16_t tt_tot, tt_count;
1000 ssize_t tt_query_size = sizeof(struct tt_query_packet);
1001 int i;
1002
1003 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1004 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1005 tt_len -= tt_len % sizeof(struct tt_change);
1006 }
1007 tt_tot = tt_len / sizeof(struct tt_change);
1008
1009 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1010 if (!skb)
1011 goto out;
1012
1013 skb_reserve(skb, ETH_HLEN);
1014 tt_response = (struct tt_query_packet *)skb_put(skb,
1015 tt_query_size + tt_len);
1016 tt_response->ttvn = ttvn;
1017
1018 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1019 tt_count = 0;
1020
1021 rcu_read_lock();
1022 for (i = 0; i < hash->size; i++) {
1023 head = &hash->table[i];
1024
1025 hlist_for_each_entry_rcu(tt_local_entry, node,
1026 head, hash_entry) {
1027 if (tt_count == tt_tot)
1028 break;
1029
1030 if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
1031 continue;
1032
1033 memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
1034 tt_change->flags = NO_FLAGS;
1035
1036 tt_count++;
1037 tt_change++;
1038 }
1039 }
1040 rcu_read_unlock();
1041
1042 /* store in the message the number of entries we have successfully
1043 * copied */
1044 tt_response->tt_data = htons(tt_count);
1045
1046 out:
1047 return skb;
1048 }
1049
1050 int send_tt_request(struct bat_priv *bat_priv, struct orig_node *dst_orig_node,
1051 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1052 {
1053 struct sk_buff *skb = NULL;
1054 struct tt_query_packet *tt_request;
1055 struct neigh_node *neigh_node = NULL;
1056 struct hard_iface *primary_if;
1057 struct tt_req_node *tt_req_node = NULL;
1058 int ret = 1;
1059
1060 primary_if = primary_if_get_selected(bat_priv);
1061 if (!primary_if)
1062 goto out;
1063
1064 /* The new tt_req will be issued only if I'm not waiting for a
1065 * reply from the same orig_node yet */
1066 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1067 if (!tt_req_node)
1068 goto out;
1069
1070 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1071 if (!skb)
1072 goto out;
1073
1074 skb_reserve(skb, ETH_HLEN);
1075
1076 tt_request = (struct tt_query_packet *)skb_put(skb,
1077 sizeof(struct tt_query_packet));
1078
1079 tt_request->packet_type = BAT_TT_QUERY;
1080 tt_request->version = COMPAT_VERSION;
1081 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1082 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1083 tt_request->ttl = TTL;
1084 tt_request->ttvn = ttvn;
1085 tt_request->tt_data = tt_crc;
1086 tt_request->flags = TT_REQUEST;
1087
1088 if (full_table)
1089 tt_request->flags |= TT_FULL_TABLE;
1090
1091 neigh_node = orig_node_get_router(dst_orig_node);
1092 if (!neigh_node)
1093 goto out;
1094
1095 bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1096 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1097 (full_table ? 'F' : '.'));
1098
1099 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1100 ret = 0;
1101
1102 out:
1103 if (neigh_node)
1104 neigh_node_free_ref(neigh_node);
1105 if (primary_if)
1106 hardif_free_ref(primary_if);
1107 if (ret)
1108 kfree_skb(skb);
1109 if (ret && tt_req_node) {
1110 spin_lock_bh(&bat_priv->tt_req_list_lock);
1111 list_del(&tt_req_node->list);
1112 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1113 kfree(tt_req_node);
1114 }
1115 return ret;
1116 }
1117
1118 static bool send_other_tt_response(struct bat_priv *bat_priv,
1119 struct tt_query_packet *tt_request)
1120 {
1121 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1122 struct neigh_node *neigh_node = NULL;
1123 struct hard_iface *primary_if = NULL;
1124 uint8_t orig_ttvn, req_ttvn, ttvn;
1125 int ret = false;
1126 unsigned char *tt_buff;
1127 bool full_table;
1128 uint16_t tt_len, tt_tot;
1129 struct sk_buff *skb = NULL;
1130 struct tt_query_packet *tt_response;
1131
1132 bat_dbg(DBG_TT, bat_priv,
1133 "Received TT_REQUEST from %pM for "
1134 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1135 tt_request->ttvn, tt_request->dst,
1136 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1137
1138 /* Let's get the orig node of the REAL destination */
1139 req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
1140 if (!req_dst_orig_node)
1141 goto out;
1142
1143 res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
1144 if (!res_dst_orig_node)
1145 goto out;
1146
1147 neigh_node = orig_node_get_router(res_dst_orig_node);
1148 if (!neigh_node)
1149 goto out;
1150
1151 primary_if = primary_if_get_selected(bat_priv);
1152 if (!primary_if)
1153 goto out;
1154
1155 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1156 req_ttvn = tt_request->ttvn;
1157
1158 /* I have not the requested data */
1159 if (orig_ttvn != req_ttvn ||
1160 tt_request->tt_data != req_dst_orig_node->tt_crc)
1161 goto out;
1162
1163 /* If it has explicitly been requested the full table */
1164 if (tt_request->flags & TT_FULL_TABLE ||
1165 !req_dst_orig_node->tt_buff)
1166 full_table = true;
1167 else
1168 full_table = false;
1169
1170 /* In this version, fragmentation is not implemented, then
1171 * I'll send only one packet with as much TT entries as I can */
1172 if (!full_table) {
1173 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1174 tt_len = req_dst_orig_node->tt_buff_len;
1175 tt_tot = tt_len / sizeof(struct tt_change);
1176
1177 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1178 tt_len + ETH_HLEN);
1179 if (!skb)
1180 goto unlock;
1181
1182 skb_reserve(skb, ETH_HLEN);
1183 tt_response = (struct tt_query_packet *)skb_put(skb,
1184 sizeof(struct tt_query_packet) + tt_len);
1185 tt_response->ttvn = req_ttvn;
1186 tt_response->tt_data = htons(tt_tot);
1187
1188 tt_buff = skb->data + sizeof(struct tt_query_packet);
1189 /* Copy the last orig_node's OGM buffer */
1190 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1191 req_dst_orig_node->tt_buff_len);
1192
1193 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1194 } else {
1195 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1196 sizeof(struct tt_change);
1197 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1198
1199 skb = tt_response_fill_table(tt_len, ttvn,
1200 bat_priv->tt_global_hash,
1201 primary_if, tt_global_valid_entry,
1202 req_dst_orig_node);
1203 if (!skb)
1204 goto out;
1205
1206 tt_response = (struct tt_query_packet *)skb->data;
1207 }
1208
1209 tt_response->packet_type = BAT_TT_QUERY;
1210 tt_response->version = COMPAT_VERSION;
1211 tt_response->ttl = TTL;
1212 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1213 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1214 tt_response->flags = TT_RESPONSE;
1215
1216 if (full_table)
1217 tt_response->flags |= TT_FULL_TABLE;
1218
1219 bat_dbg(DBG_TT, bat_priv,
1220 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1221 res_dst_orig_node->orig, neigh_node->addr,
1222 req_dst_orig_node->orig, req_ttvn);
1223
1224 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1225 ret = true;
1226 goto out;
1227
1228 unlock:
1229 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1230
1231 out:
1232 if (res_dst_orig_node)
1233 orig_node_free_ref(res_dst_orig_node);
1234 if (req_dst_orig_node)
1235 orig_node_free_ref(req_dst_orig_node);
1236 if (neigh_node)
1237 neigh_node_free_ref(neigh_node);
1238 if (primary_if)
1239 hardif_free_ref(primary_if);
1240 if (!ret)
1241 kfree_skb(skb);
1242 return ret;
1243
1244 }
1245 static bool send_my_tt_response(struct bat_priv *bat_priv,
1246 struct tt_query_packet *tt_request)
1247 {
1248 struct orig_node *orig_node = NULL;
1249 struct neigh_node *neigh_node = NULL;
1250 struct hard_iface *primary_if = NULL;
1251 uint8_t my_ttvn, req_ttvn, ttvn;
1252 int ret = false;
1253 unsigned char *tt_buff;
1254 bool full_table;
1255 uint16_t tt_len, tt_tot;
1256 struct sk_buff *skb = NULL;
1257 struct tt_query_packet *tt_response;
1258
1259 bat_dbg(DBG_TT, bat_priv,
1260 "Received TT_REQUEST from %pM for "
1261 "ttvn: %u (me) [%c]\n", tt_request->src,
1262 tt_request->ttvn,
1263 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1264
1265
1266 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1267 req_ttvn = tt_request->ttvn;
1268
1269 orig_node = get_orig_node(bat_priv, tt_request->src);
1270 if (!orig_node)
1271 goto out;
1272
1273 neigh_node = orig_node_get_router(orig_node);
1274 if (!neigh_node)
1275 goto out;
1276
1277 primary_if = primary_if_get_selected(bat_priv);
1278 if (!primary_if)
1279 goto out;
1280
1281 /* If the full table has been explicitly requested or the gap
1282 * is too big send the whole local translation table */
1283 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1284 !bat_priv->tt_buff)
1285 full_table = true;
1286 else
1287 full_table = false;
1288
1289 /* In this version, fragmentation is not implemented, then
1290 * I'll send only one packet with as much TT entries as I can */
1291 if (!full_table) {
1292 spin_lock_bh(&bat_priv->tt_buff_lock);
1293 tt_len = bat_priv->tt_buff_len;
1294 tt_tot = tt_len / sizeof(struct tt_change);
1295
1296 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1297 tt_len + ETH_HLEN);
1298 if (!skb)
1299 goto unlock;
1300
1301 skb_reserve(skb, ETH_HLEN);
1302 tt_response = (struct tt_query_packet *)skb_put(skb,
1303 sizeof(struct tt_query_packet) + tt_len);
1304 tt_response->ttvn = req_ttvn;
1305 tt_response->tt_data = htons(tt_tot);
1306
1307 tt_buff = skb->data + sizeof(struct tt_query_packet);
1308 memcpy(tt_buff, bat_priv->tt_buff,
1309 bat_priv->tt_buff_len);
1310 spin_unlock_bh(&bat_priv->tt_buff_lock);
1311 } else {
1312 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1313 sizeof(struct tt_change);
1314 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1315
1316 skb = tt_response_fill_table(tt_len, ttvn,
1317 bat_priv->tt_local_hash,
1318 primary_if, tt_local_valid_entry,
1319 NULL);
1320 if (!skb)
1321 goto out;
1322
1323 tt_response = (struct tt_query_packet *)skb->data;
1324 }
1325
1326 tt_response->packet_type = BAT_TT_QUERY;
1327 tt_response->version = COMPAT_VERSION;
1328 tt_response->ttl = TTL;
1329 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1330 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1331 tt_response->flags = TT_RESPONSE;
1332
1333 if (full_table)
1334 tt_response->flags |= TT_FULL_TABLE;
1335
1336 bat_dbg(DBG_TT, bat_priv,
1337 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1338 orig_node->orig, neigh_node->addr,
1339 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1340
1341 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1342 ret = true;
1343 goto out;
1344
1345 unlock:
1346 spin_unlock_bh(&bat_priv->tt_buff_lock);
1347 out:
1348 if (orig_node)
1349 orig_node_free_ref(orig_node);
1350 if (neigh_node)
1351 neigh_node_free_ref(neigh_node);
1352 if (primary_if)
1353 hardif_free_ref(primary_if);
1354 if (!ret)
1355 kfree_skb(skb);
1356 /* This packet was for me, so it doesn't need to be re-routed */
1357 return true;
1358 }
1359
1360 bool send_tt_response(struct bat_priv *bat_priv,
1361 struct tt_query_packet *tt_request)
1362 {
1363 if (is_my_mac(tt_request->dst))
1364 return send_my_tt_response(bat_priv, tt_request);
1365 else
1366 return send_other_tt_response(bat_priv, tt_request);
1367 }
1368
1369 static void _tt_update_changes(struct bat_priv *bat_priv,
1370 struct orig_node *orig_node,
1371 struct tt_change *tt_change,
1372 uint16_t tt_num_changes, uint8_t ttvn)
1373 {
1374 int i;
1375
1376 for (i = 0; i < tt_num_changes; i++) {
1377 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1378 tt_global_del(bat_priv, orig_node,
1379 (tt_change + i)->addr,
1380 "tt removed by changes",
1381 (tt_change + i)->flags & TT_CLIENT_ROAM);
1382 else
1383 if (!tt_global_add(bat_priv, orig_node,
1384 (tt_change + i)->addr, ttvn, false))
1385 /* In case of problem while storing a
1386 * global_entry, we stop the updating
1387 * procedure without committing the
1388 * ttvn change. This will avoid to send
1389 * corrupted data on tt_request
1390 */
1391 return;
1392 }
1393 }
1394
1395 static void tt_fill_gtable(struct bat_priv *bat_priv,
1396 struct tt_query_packet *tt_response)
1397 {
1398 struct orig_node *orig_node = NULL;
1399
1400 orig_node = orig_hash_find(bat_priv, tt_response->src);
1401 if (!orig_node)
1402 goto out;
1403
1404 /* Purge the old table first.. */
1405 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1406
1407 _tt_update_changes(bat_priv, orig_node,
1408 (struct tt_change *)(tt_response + 1),
1409 tt_response->tt_data, tt_response->ttvn);
1410
1411 spin_lock_bh(&orig_node->tt_buff_lock);
1412 kfree(orig_node->tt_buff);
1413 orig_node->tt_buff_len = 0;
1414 orig_node->tt_buff = NULL;
1415 spin_unlock_bh(&orig_node->tt_buff_lock);
1416
1417 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1418
1419 out:
1420 if (orig_node)
1421 orig_node_free_ref(orig_node);
1422 }
1423
1424 void tt_update_changes(struct bat_priv *bat_priv, struct orig_node *orig_node,
1425 uint16_t tt_num_changes, uint8_t ttvn,
1426 struct tt_change *tt_change)
1427 {
1428 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1429 ttvn);
1430
1431 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1432 tt_num_changes);
1433 atomic_set(&orig_node->last_ttvn, ttvn);
1434 }
1435
1436 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1437 {
1438 struct tt_local_entry *tt_local_entry = NULL;
1439 bool ret = false;
1440
1441 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1442 if (!tt_local_entry)
1443 goto out;
1444 /* Check if the client has been logically deleted (but is kept for
1445 * consistency purpose) */
1446 if (tt_local_entry->flags & TT_CLIENT_PENDING)
1447 goto out;
1448 ret = true;
1449 out:
1450 if (tt_local_entry)
1451 tt_local_entry_free_ref(tt_local_entry);
1452 return ret;
1453 }
1454
1455 void handle_tt_response(struct bat_priv *bat_priv,
1456 struct tt_query_packet *tt_response)
1457 {
1458 struct tt_req_node *node, *safe;
1459 struct orig_node *orig_node = NULL;
1460
1461 bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1462 "ttvn %d t_size: %d [%c]\n",
1463 tt_response->src, tt_response->ttvn,
1464 tt_response->tt_data,
1465 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1466
1467 orig_node = orig_hash_find(bat_priv, tt_response->src);
1468 if (!orig_node)
1469 goto out;
1470
1471 if (tt_response->flags & TT_FULL_TABLE)
1472 tt_fill_gtable(bat_priv, tt_response);
1473 else
1474 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1475 tt_response->ttvn,
1476 (struct tt_change *)(tt_response + 1));
1477
1478 /* Delete the tt_req_node from pending tt_requests list */
1479 spin_lock_bh(&bat_priv->tt_req_list_lock);
1480 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1481 if (!compare_eth(node->addr, tt_response->src))
1482 continue;
1483 list_del(&node->list);
1484 kfree(node);
1485 }
1486 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1487
1488 /* Recalculate the CRC for this orig_node and store it */
1489 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1490 /* Roaming phase is over: tables are in sync again. I can
1491 * unset the flag */
1492 orig_node->tt_poss_change = false;
1493 out:
1494 if (orig_node)
1495 orig_node_free_ref(orig_node);
1496 }
1497
1498 int tt_init(struct bat_priv *bat_priv)
1499 {
1500 if (!tt_local_init(bat_priv))
1501 return 0;
1502
1503 if (!tt_global_init(bat_priv))
1504 return 0;
1505
1506 tt_start_timer(bat_priv);
1507
1508 return 1;
1509 }
1510
1511 static void tt_roam_list_free(struct bat_priv *bat_priv)
1512 {
1513 struct tt_roam_node *node, *safe;
1514
1515 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1516
1517 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1518 list_del(&node->list);
1519 kfree(node);
1520 }
1521
1522 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1523 }
1524
1525 static void tt_roam_purge(struct bat_priv *bat_priv)
1526 {
1527 struct tt_roam_node *node, *safe;
1528
1529 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1530 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1531 if (!is_out_of_time(node->first_time,
1532 ROAMING_MAX_TIME * 1000))
1533 continue;
1534
1535 list_del(&node->list);
1536 kfree(node);
1537 }
1538 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1539 }
1540
1541 /* This function checks whether the client already reached the
1542 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1543 * will not be sent.
1544 *
1545 * returns true if the ROAMING_ADV can be sent, false otherwise */
1546 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1547 uint8_t *client)
1548 {
1549 struct tt_roam_node *tt_roam_node;
1550 bool ret = false;
1551
1552 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1553 /* The new tt_req will be issued only if I'm not waiting for a
1554 * reply from the same orig_node yet */
1555 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1556 if (!compare_eth(tt_roam_node->addr, client))
1557 continue;
1558
1559 if (is_out_of_time(tt_roam_node->first_time,
1560 ROAMING_MAX_TIME * 1000))
1561 continue;
1562
1563 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1564 /* Sorry, you roamed too many times! */
1565 goto unlock;
1566 ret = true;
1567 break;
1568 }
1569
1570 if (!ret) {
1571 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1572 if (!tt_roam_node)
1573 goto unlock;
1574
1575 tt_roam_node->first_time = jiffies;
1576 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1577 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1578
1579 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1580 ret = true;
1581 }
1582
1583 unlock:
1584 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1585 return ret;
1586 }
1587
1588 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1589 struct orig_node *orig_node)
1590 {
1591 struct neigh_node *neigh_node = NULL;
1592 struct sk_buff *skb = NULL;
1593 struct roam_adv_packet *roam_adv_packet;
1594 int ret = 1;
1595 struct hard_iface *primary_if;
1596
1597 /* before going on we have to check whether the client has
1598 * already roamed to us too many times */
1599 if (!tt_check_roam_count(bat_priv, client))
1600 goto out;
1601
1602 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1603 if (!skb)
1604 goto out;
1605
1606 skb_reserve(skb, ETH_HLEN);
1607
1608 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1609 sizeof(struct roam_adv_packet));
1610
1611 roam_adv_packet->packet_type = BAT_ROAM_ADV;
1612 roam_adv_packet->version = COMPAT_VERSION;
1613 roam_adv_packet->ttl = TTL;
1614 primary_if = primary_if_get_selected(bat_priv);
1615 if (!primary_if)
1616 goto out;
1617 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1618 hardif_free_ref(primary_if);
1619 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1620 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1621
1622 neigh_node = orig_node_get_router(orig_node);
1623 if (!neigh_node)
1624 goto out;
1625
1626 bat_dbg(DBG_TT, bat_priv,
1627 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1628 orig_node->orig, client, neigh_node->addr);
1629
1630 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1631 ret = 0;
1632
1633 out:
1634 if (neigh_node)
1635 neigh_node_free_ref(neigh_node);
1636 if (ret)
1637 kfree_skb(skb);
1638 return;
1639 }
1640
1641 static void tt_purge(struct work_struct *work)
1642 {
1643 struct delayed_work *delayed_work =
1644 container_of(work, struct delayed_work, work);
1645 struct bat_priv *bat_priv =
1646 container_of(delayed_work, struct bat_priv, tt_work);
1647
1648 tt_local_purge(bat_priv);
1649 tt_global_roam_purge(bat_priv);
1650 tt_req_purge(bat_priv);
1651 tt_roam_purge(bat_priv);
1652
1653 tt_start_timer(bat_priv);
1654 }
1655
1656 void tt_free(struct bat_priv *bat_priv)
1657 {
1658 cancel_delayed_work_sync(&bat_priv->tt_work);
1659
1660 tt_local_table_free(bat_priv);
1661 tt_global_table_free(bat_priv);
1662 tt_req_list_free(bat_priv);
1663 tt_changes_list_free(bat_priv);
1664 tt_roam_list_free(bat_priv);
1665
1666 kfree(bat_priv->tt_buff);
1667 }
1668
1669 /* This function will reset the specified flags from all the entries in
1670 * the given hash table and will increment num_local_tt for each involved
1671 * entry */
1672 static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
1673 {
1674 int i;
1675 struct hashtable_t *hash = bat_priv->tt_local_hash;
1676 struct hlist_head *head;
1677 struct hlist_node *node;
1678 struct tt_local_entry *tt_local_entry;
1679
1680 if (!hash)
1681 return;
1682
1683 for (i = 0; i < hash->size; i++) {
1684 head = &hash->table[i];
1685
1686 rcu_read_lock();
1687 hlist_for_each_entry_rcu(tt_local_entry, node,
1688 head, hash_entry) {
1689 if (!(tt_local_entry->flags & flags))
1690 continue;
1691 tt_local_entry->flags &= ~flags;
1692 atomic_inc(&bat_priv->num_local_tt);
1693 }
1694 rcu_read_unlock();
1695 }
1696
1697 }
1698
1699 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1700 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1701 {
1702 struct hashtable_t *hash = bat_priv->tt_local_hash;
1703 struct tt_local_entry *tt_local_entry;
1704 struct hlist_node *node, *node_tmp;
1705 struct hlist_head *head;
1706 spinlock_t *list_lock; /* protects write access to the hash lists */
1707 int i;
1708
1709 if (!hash)
1710 return;
1711
1712 for (i = 0; i < hash->size; i++) {
1713 head = &hash->table[i];
1714 list_lock = &hash->list_locks[i];
1715
1716 spin_lock_bh(list_lock);
1717 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
1718 head, hash_entry) {
1719 if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
1720 continue;
1721
1722 bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1723 "(%pM): pending\n", tt_local_entry->addr);
1724
1725 atomic_dec(&bat_priv->num_local_tt);
1726 hlist_del_rcu(node);
1727 tt_local_entry_free_ref(tt_local_entry);
1728 }
1729 spin_unlock_bh(list_lock);
1730 }
1731
1732 }
1733
1734 void tt_commit_changes(struct bat_priv *bat_priv)
1735 {
1736 tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
1737 tt_local_purge_pending_clients(bat_priv);
1738
1739 /* Increment the TTVN only once per OGM interval */
1740 atomic_inc(&bat_priv->ttvn);
1741 bat_priv->tt_poss_change = false;
1742 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree