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batman-adv: remove references for global tt entries
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / batman-adv / translation-table.c
blobca537ed2dd0a650b580df5470324c84ea5bc430b
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 for (i = 0; i < hash->size; i++) {
702 head = &hash->table[i];
703 list_lock = &hash->list_locks[i];
704
705 spin_lock_bh(list_lock);
706 hlist_for_each_entry_safe(tt_global_entry, node, safe,
707 head, hash_entry) {
708 if (tt_global_entry->orig_node == orig_node) {
709 bat_dbg(DBG_TT, bat_priv,
710 "Deleting global tt entry %pM "
711 "(via %pM): originator time out\n",
712 tt_global_entry->addr,
713 tt_global_entry->orig_node->orig);
714 hlist_del_rcu(node);
715 tt_global_entry_free_ref(tt_global_entry);
716 }
717 }
718 spin_unlock_bh(list_lock);
719 }
720 atomic_set(&orig_node->tt_size, 0);
721 }
722
723 static void tt_global_roam_purge(struct bat_priv *bat_priv)
724 {
725 struct hashtable_t *hash = bat_priv->tt_global_hash;
726 struct tt_global_entry *tt_global_entry;
727 struct hlist_node *node, *node_tmp;
728 struct hlist_head *head;
729 spinlock_t *list_lock; /* protects write access to the hash lists */
730 int i;
731
732 for (i = 0; i < hash->size; i++) {
733 head = &hash->table[i];
734 list_lock = &hash->list_locks[i];
735
736 spin_lock_bh(list_lock);
737 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
738 head, hash_entry) {
739 if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
740 continue;
741 if (!is_out_of_time(tt_global_entry->roam_at,
742 TT_CLIENT_ROAM_TIMEOUT * 1000))
743 continue;
744
745 bat_dbg(DBG_TT, bat_priv, "Deleting global "
746 "tt entry (%pM): Roaming timeout\n",
747 tt_global_entry->addr);
748 atomic_dec(&tt_global_entry->orig_node->tt_size);
749 hlist_del_rcu(node);
750 tt_global_entry_free_ref(tt_global_entry);
751 }
752 spin_unlock_bh(list_lock);
753 }
754
755 }
756
757 static void tt_global_table_free(struct bat_priv *bat_priv)
758 {
759 struct hashtable_t *hash;
760 spinlock_t *list_lock; /* protects write access to the hash lists */
761 struct tt_global_entry *tt_global_entry;
762 struct hlist_node *node, *node_tmp;
763 struct hlist_head *head;
764 int i;
765
766 if (!bat_priv->tt_global_hash)
767 return;
768
769 hash = bat_priv->tt_global_hash;
770
771 for (i = 0; i < hash->size; i++) {
772 head = &hash->table[i];
773 list_lock = &hash->list_locks[i];
774
775 spin_lock_bh(list_lock);
776 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
777 head, hash_entry) {
778 hlist_del_rcu(node);
779 tt_global_entry_free_ref(tt_global_entry);
780 }
781 spin_unlock_bh(list_lock);
782 }
783
784 hash_destroy(hash);
785
786 bat_priv->tt_global_hash = NULL;
787 }
788
789 struct orig_node *transtable_search(struct bat_priv *bat_priv,
790 const uint8_t *addr)
791 {
792 struct tt_global_entry *tt_global_entry;
793 struct orig_node *orig_node = NULL;
794
795 tt_global_entry = tt_global_hash_find(bat_priv, addr);
796
797 if (!tt_global_entry)
798 goto out;
799
800 if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
801 goto free_tt;
802
803 /* A global client marked as PENDING has already moved from that
804 * originator */
805 if (tt_global_entry->flags & TT_CLIENT_PENDING)
806 goto free_tt;
807
808 orig_node = tt_global_entry->orig_node;
809
810 free_tt:
811 tt_global_entry_free_ref(tt_global_entry);
812 out:
813 return orig_node;
814 }
815
816 /* Calculates the checksum of the local table of a given orig_node */
817 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
818 {
819 uint16_t total = 0, total_one;
820 struct hashtable_t *hash = bat_priv->tt_global_hash;
821 struct tt_global_entry *tt_global_entry;
822 struct hlist_node *node;
823 struct hlist_head *head;
824 int i, j;
825
826 for (i = 0; i < hash->size; i++) {
827 head = &hash->table[i];
828
829 rcu_read_lock();
830 hlist_for_each_entry_rcu(tt_global_entry, node,
831 head, hash_entry) {
832 if (compare_eth(tt_global_entry->orig_node,
833 orig_node)) {
834 /* Roaming clients are in the global table for
835 * consistency only. They don't have to be
836 * taken into account while computing the
837 * global crc */
838 if (tt_global_entry->flags & TT_CLIENT_ROAM)
839 continue;
840 total_one = 0;
841 for (j = 0; j < ETH_ALEN; j++)
842 total_one = crc16_byte(total_one,
843 tt_global_entry->addr[j]);
844 total ^= total_one;
845 }
846 }
847 rcu_read_unlock();
848 }
849
850 return total;
851 }
852
853 /* Calculates the checksum of the local table */
854 uint16_t tt_local_crc(struct bat_priv *bat_priv)
855 {
856 uint16_t total = 0, total_one;
857 struct hashtable_t *hash = bat_priv->tt_local_hash;
858 struct tt_local_entry *tt_local_entry;
859 struct hlist_node *node;
860 struct hlist_head *head;
861 int i, j;
862
863 for (i = 0; i < hash->size; i++) {
864 head = &hash->table[i];
865
866 rcu_read_lock();
867 hlist_for_each_entry_rcu(tt_local_entry, node,
868 head, hash_entry) {
869 /* not yet committed clients have not to be taken into
870 * account while computing the CRC */
871 if (tt_local_entry->flags & TT_CLIENT_NEW)
872 continue;
873 total_one = 0;
874 for (j = 0; j < ETH_ALEN; j++)
875 total_one = crc16_byte(total_one,
876 tt_local_entry->addr[j]);
877 total ^= total_one;
878 }
879 rcu_read_unlock();
880 }
881
882 return total;
883 }
884
885 static void tt_req_list_free(struct bat_priv *bat_priv)
886 {
887 struct tt_req_node *node, *safe;
888
889 spin_lock_bh(&bat_priv->tt_req_list_lock);
890
891 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
892 list_del(&node->list);
893 kfree(node);
894 }
895
896 spin_unlock_bh(&bat_priv->tt_req_list_lock);
897 }
898
899 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
900 const unsigned char *tt_buff, uint8_t tt_num_changes)
901 {
902 uint16_t tt_buff_len = tt_len(tt_num_changes);
903
904 /* Replace the old buffer only if I received something in the
905 * last OGM (the OGM could carry no changes) */
906 spin_lock_bh(&orig_node->tt_buff_lock);
907 if (tt_buff_len > 0) {
908 kfree(orig_node->tt_buff);
909 orig_node->tt_buff_len = 0;
910 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
911 if (orig_node->tt_buff) {
912 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
913 orig_node->tt_buff_len = tt_buff_len;
914 }
915 }
916 spin_unlock_bh(&orig_node->tt_buff_lock);
917 }
918
919 static void tt_req_purge(struct bat_priv *bat_priv)
920 {
921 struct tt_req_node *node, *safe;
922
923 spin_lock_bh(&bat_priv->tt_req_list_lock);
924 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
925 if (is_out_of_time(node->issued_at,
926 TT_REQUEST_TIMEOUT * 1000)) {
927 list_del(&node->list);
928 kfree(node);
929 }
930 }
931 spin_unlock_bh(&bat_priv->tt_req_list_lock);
932 }
933
934 /* returns the pointer to the new tt_req_node struct if no request
935 * has already been issued for this orig_node, NULL otherwise */
936 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
937 struct orig_node *orig_node)
938 {
939 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
940
941 spin_lock_bh(&bat_priv->tt_req_list_lock);
942 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
943 if (compare_eth(tt_req_node_tmp, orig_node) &&
944 !is_out_of_time(tt_req_node_tmp->issued_at,
945 TT_REQUEST_TIMEOUT * 1000))
946 goto unlock;
947 }
948
949 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
950 if (!tt_req_node)
951 goto unlock;
952
953 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
954 tt_req_node->issued_at = jiffies;
955
956 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
957 unlock:
958 spin_unlock_bh(&bat_priv->tt_req_list_lock);
959 return tt_req_node;
960 }
961
962 /* data_ptr is useless here, but has to be kept to respect the prototype */
963 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
964 {
965 const struct tt_local_entry *tt_local_entry = entry_ptr;
966
967 if (tt_local_entry->flags & TT_CLIENT_NEW)
968 return 0;
969 return 1;
970 }
971
972 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
973 {
974 const struct tt_global_entry *tt_global_entry = entry_ptr;
975 const struct orig_node *orig_node = data_ptr;
976
977 if (tt_global_entry->flags & TT_CLIENT_ROAM)
978 return 0;
979
980 return (tt_global_entry->orig_node == orig_node);
981 }
982
983 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
984 struct hashtable_t *hash,
985 struct hard_iface *primary_if,
986 int (*valid_cb)(const void *,
987 const void *),
988 void *cb_data)
989 {
990 struct tt_local_entry *tt_local_entry;
991 struct tt_query_packet *tt_response;
992 struct tt_change *tt_change;
993 struct hlist_node *node;
994 struct hlist_head *head;
995 struct sk_buff *skb = NULL;
996 uint16_t tt_tot, tt_count;
997 ssize_t tt_query_size = sizeof(struct tt_query_packet);
998 int i;
999
1000 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1001 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1002 tt_len -= tt_len % sizeof(struct tt_change);
1003 }
1004 tt_tot = tt_len / sizeof(struct tt_change);
1005
1006 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1007 if (!skb)
1008 goto out;
1009
1010 skb_reserve(skb, ETH_HLEN);
1011 tt_response = (struct tt_query_packet *)skb_put(skb,
1012 tt_query_size + tt_len);
1013 tt_response->ttvn = ttvn;
1014
1015 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1016 tt_count = 0;
1017
1018 rcu_read_lock();
1019 for (i = 0; i < hash->size; i++) {
1020 head = &hash->table[i];
1021
1022 hlist_for_each_entry_rcu(tt_local_entry, node,
1023 head, hash_entry) {
1024 if (tt_count == tt_tot)
1025 break;
1026
1027 if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
1028 continue;
1029
1030 memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
1031 tt_change->flags = NO_FLAGS;
1032
1033 tt_count++;
1034 tt_change++;
1035 }
1036 }
1037 rcu_read_unlock();
1038
1039 /* store in the message the number of entries we have successfully
1040 * copied */
1041 tt_response->tt_data = htons(tt_count);
1042
1043 out:
1044 return skb;
1045 }
1046
1047 int send_tt_request(struct bat_priv *bat_priv, struct orig_node *dst_orig_node,
1048 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1049 {
1050 struct sk_buff *skb = NULL;
1051 struct tt_query_packet *tt_request;
1052 struct neigh_node *neigh_node = NULL;
1053 struct hard_iface *primary_if;
1054 struct tt_req_node *tt_req_node = NULL;
1055 int ret = 1;
1056
1057 primary_if = primary_if_get_selected(bat_priv);
1058 if (!primary_if)
1059 goto out;
1060
1061 /* The new tt_req will be issued only if I'm not waiting for a
1062 * reply from the same orig_node yet */
1063 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1064 if (!tt_req_node)
1065 goto out;
1066
1067 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1068 if (!skb)
1069 goto out;
1070
1071 skb_reserve(skb, ETH_HLEN);
1072
1073 tt_request = (struct tt_query_packet *)skb_put(skb,
1074 sizeof(struct tt_query_packet));
1075
1076 tt_request->packet_type = BAT_TT_QUERY;
1077 tt_request->version = COMPAT_VERSION;
1078 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1079 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1080 tt_request->ttl = TTL;
1081 tt_request->ttvn = ttvn;
1082 tt_request->tt_data = tt_crc;
1083 tt_request->flags = TT_REQUEST;
1084
1085 if (full_table)
1086 tt_request->flags |= TT_FULL_TABLE;
1087
1088 neigh_node = orig_node_get_router(dst_orig_node);
1089 if (!neigh_node)
1090 goto out;
1091
1092 bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1093 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1094 (full_table ? 'F' : '.'));
1095
1096 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1097 ret = 0;
1098
1099 out:
1100 if (neigh_node)
1101 neigh_node_free_ref(neigh_node);
1102 if (primary_if)
1103 hardif_free_ref(primary_if);
1104 if (ret)
1105 kfree_skb(skb);
1106 if (ret && tt_req_node) {
1107 spin_lock_bh(&bat_priv->tt_req_list_lock);
1108 list_del(&tt_req_node->list);
1109 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1110 kfree(tt_req_node);
1111 }
1112 return ret;
1113 }
1114
1115 static bool send_other_tt_response(struct bat_priv *bat_priv,
1116 struct tt_query_packet *tt_request)
1117 {
1118 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1119 struct neigh_node *neigh_node = NULL;
1120 struct hard_iface *primary_if = NULL;
1121 uint8_t orig_ttvn, req_ttvn, ttvn;
1122 int ret = false;
1123 unsigned char *tt_buff;
1124 bool full_table;
1125 uint16_t tt_len, tt_tot;
1126 struct sk_buff *skb = NULL;
1127 struct tt_query_packet *tt_response;
1128
1129 bat_dbg(DBG_TT, bat_priv,
1130 "Received TT_REQUEST from %pM for "
1131 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1132 tt_request->ttvn, tt_request->dst,
1133 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1134
1135 /* Let's get the orig node of the REAL destination */
1136 req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
1137 if (!req_dst_orig_node)
1138 goto out;
1139
1140 res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
1141 if (!res_dst_orig_node)
1142 goto out;
1143
1144 neigh_node = orig_node_get_router(res_dst_orig_node);
1145 if (!neigh_node)
1146 goto out;
1147
1148 primary_if = primary_if_get_selected(bat_priv);
1149 if (!primary_if)
1150 goto out;
1151
1152 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1153 req_ttvn = tt_request->ttvn;
1154
1155 /* I have not the requested data */
1156 if (orig_ttvn != req_ttvn ||
1157 tt_request->tt_data != req_dst_orig_node->tt_crc)
1158 goto out;
1159
1160 /* If it has explicitly been requested the full table */
1161 if (tt_request->flags & TT_FULL_TABLE ||
1162 !req_dst_orig_node->tt_buff)
1163 full_table = true;
1164 else
1165 full_table = false;
1166
1167 /* In this version, fragmentation is not implemented, then
1168 * I'll send only one packet with as much TT entries as I can */
1169 if (!full_table) {
1170 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1171 tt_len = req_dst_orig_node->tt_buff_len;
1172 tt_tot = tt_len / sizeof(struct tt_change);
1173
1174 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1175 tt_len + ETH_HLEN);
1176 if (!skb)
1177 goto unlock;
1178
1179 skb_reserve(skb, ETH_HLEN);
1180 tt_response = (struct tt_query_packet *)skb_put(skb,
1181 sizeof(struct tt_query_packet) + tt_len);
1182 tt_response->ttvn = req_ttvn;
1183 tt_response->tt_data = htons(tt_tot);
1184
1185 tt_buff = skb->data + sizeof(struct tt_query_packet);
1186 /* Copy the last orig_node's OGM buffer */
1187 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1188 req_dst_orig_node->tt_buff_len);
1189
1190 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1191 } else {
1192 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1193 sizeof(struct tt_change);
1194 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1195
1196 skb = tt_response_fill_table(tt_len, ttvn,
1197 bat_priv->tt_global_hash,
1198 primary_if, tt_global_valid_entry,
1199 req_dst_orig_node);
1200 if (!skb)
1201 goto out;
1202
1203 tt_response = (struct tt_query_packet *)skb->data;
1204 }
1205
1206 tt_response->packet_type = BAT_TT_QUERY;
1207 tt_response->version = COMPAT_VERSION;
1208 tt_response->ttl = TTL;
1209 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1210 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1211 tt_response->flags = TT_RESPONSE;
1212
1213 if (full_table)
1214 tt_response->flags |= TT_FULL_TABLE;
1215
1216 bat_dbg(DBG_TT, bat_priv,
1217 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1218 res_dst_orig_node->orig, neigh_node->addr,
1219 req_dst_orig_node->orig, req_ttvn);
1220
1221 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1222 ret = true;
1223 goto out;
1224
1225 unlock:
1226 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1227
1228 out:
1229 if (res_dst_orig_node)
1230 orig_node_free_ref(res_dst_orig_node);
1231 if (req_dst_orig_node)
1232 orig_node_free_ref(req_dst_orig_node);
1233 if (neigh_node)
1234 neigh_node_free_ref(neigh_node);
1235 if (primary_if)
1236 hardif_free_ref(primary_if);
1237 if (!ret)
1238 kfree_skb(skb);
1239 return ret;
1240
1241 }
1242 static bool send_my_tt_response(struct bat_priv *bat_priv,
1243 struct tt_query_packet *tt_request)
1244 {
1245 struct orig_node *orig_node = NULL;
1246 struct neigh_node *neigh_node = NULL;
1247 struct hard_iface *primary_if = NULL;
1248 uint8_t my_ttvn, req_ttvn, ttvn;
1249 int ret = false;
1250 unsigned char *tt_buff;
1251 bool full_table;
1252 uint16_t tt_len, tt_tot;
1253 struct sk_buff *skb = NULL;
1254 struct tt_query_packet *tt_response;
1255
1256 bat_dbg(DBG_TT, bat_priv,
1257 "Received TT_REQUEST from %pM for "
1258 "ttvn: %u (me) [%c]\n", tt_request->src,
1259 tt_request->ttvn,
1260 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1261
1262
1263 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1264 req_ttvn = tt_request->ttvn;
1265
1266 orig_node = get_orig_node(bat_priv, tt_request->src);
1267 if (!orig_node)
1268 goto out;
1269
1270 neigh_node = orig_node_get_router(orig_node);
1271 if (!neigh_node)
1272 goto out;
1273
1274 primary_if = primary_if_get_selected(bat_priv);
1275 if (!primary_if)
1276 goto out;
1277
1278 /* If the full table has been explicitly requested or the gap
1279 * is too big send the whole local translation table */
1280 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1281 !bat_priv->tt_buff)
1282 full_table = true;
1283 else
1284 full_table = false;
1285
1286 /* In this version, fragmentation is not implemented, then
1287 * I'll send only one packet with as much TT entries as I can */
1288 if (!full_table) {
1289 spin_lock_bh(&bat_priv->tt_buff_lock);
1290 tt_len = bat_priv->tt_buff_len;
1291 tt_tot = tt_len / sizeof(struct tt_change);
1292
1293 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1294 tt_len + ETH_HLEN);
1295 if (!skb)
1296 goto unlock;
1297
1298 skb_reserve(skb, ETH_HLEN);
1299 tt_response = (struct tt_query_packet *)skb_put(skb,
1300 sizeof(struct tt_query_packet) + tt_len);
1301 tt_response->ttvn = req_ttvn;
1302 tt_response->tt_data = htons(tt_tot);
1303
1304 tt_buff = skb->data + sizeof(struct tt_query_packet);
1305 memcpy(tt_buff, bat_priv->tt_buff,
1306 bat_priv->tt_buff_len);
1307 spin_unlock_bh(&bat_priv->tt_buff_lock);
1308 } else {
1309 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1310 sizeof(struct tt_change);
1311 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1312
1313 skb = tt_response_fill_table(tt_len, ttvn,
1314 bat_priv->tt_local_hash,
1315 primary_if, tt_local_valid_entry,
1316 NULL);
1317 if (!skb)
1318 goto out;
1319
1320 tt_response = (struct tt_query_packet *)skb->data;
1321 }
1322
1323 tt_response->packet_type = BAT_TT_QUERY;
1324 tt_response->version = COMPAT_VERSION;
1325 tt_response->ttl = TTL;
1326 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1327 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1328 tt_response->flags = TT_RESPONSE;
1329
1330 if (full_table)
1331 tt_response->flags |= TT_FULL_TABLE;
1332
1333 bat_dbg(DBG_TT, bat_priv,
1334 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1335 orig_node->orig, neigh_node->addr,
1336 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1337
1338 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1339 ret = true;
1340 goto out;
1341
1342 unlock:
1343 spin_unlock_bh(&bat_priv->tt_buff_lock);
1344 out:
1345 if (orig_node)
1346 orig_node_free_ref(orig_node);
1347 if (neigh_node)
1348 neigh_node_free_ref(neigh_node);
1349 if (primary_if)
1350 hardif_free_ref(primary_if);
1351 if (!ret)
1352 kfree_skb(skb);
1353 /* This packet was for me, so it doesn't need to be re-routed */
1354 return true;
1355 }
1356
1357 bool send_tt_response(struct bat_priv *bat_priv,
1358 struct tt_query_packet *tt_request)
1359 {
1360 if (is_my_mac(tt_request->dst))
1361 return send_my_tt_response(bat_priv, tt_request);
1362 else
1363 return send_other_tt_response(bat_priv, tt_request);
1364 }
1365
1366 static void _tt_update_changes(struct bat_priv *bat_priv,
1367 struct orig_node *orig_node,
1368 struct tt_change *tt_change,
1369 uint16_t tt_num_changes, uint8_t ttvn)
1370 {
1371 int i;
1372
1373 for (i = 0; i < tt_num_changes; i++) {
1374 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1375 tt_global_del(bat_priv, orig_node,
1376 (tt_change + i)->addr,
1377 "tt removed by changes",
1378 (tt_change + i)->flags & TT_CLIENT_ROAM);
1379 else
1380 if (!tt_global_add(bat_priv, orig_node,
1381 (tt_change + i)->addr, ttvn, false))
1382 /* In case of problem while storing a
1383 * global_entry, we stop the updating
1384 * procedure without committing the
1385 * ttvn change. This will avoid to send
1386 * corrupted data on tt_request
1387 */
1388 return;
1389 }
1390 }
1391
1392 static void tt_fill_gtable(struct bat_priv *bat_priv,
1393 struct tt_query_packet *tt_response)
1394 {
1395 struct orig_node *orig_node = NULL;
1396
1397 orig_node = orig_hash_find(bat_priv, tt_response->src);
1398 if (!orig_node)
1399 goto out;
1400
1401 /* Purge the old table first.. */
1402 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1403
1404 _tt_update_changes(bat_priv, orig_node,
1405 (struct tt_change *)(tt_response + 1),
1406 tt_response->tt_data, tt_response->ttvn);
1407
1408 spin_lock_bh(&orig_node->tt_buff_lock);
1409 kfree(orig_node->tt_buff);
1410 orig_node->tt_buff_len = 0;
1411 orig_node->tt_buff = NULL;
1412 spin_unlock_bh(&orig_node->tt_buff_lock);
1413
1414 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1415
1416 out:
1417 if (orig_node)
1418 orig_node_free_ref(orig_node);
1419 }
1420
1421 void tt_update_changes(struct bat_priv *bat_priv, struct orig_node *orig_node,
1422 uint16_t tt_num_changes, uint8_t ttvn,
1423 struct tt_change *tt_change)
1424 {
1425 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1426 ttvn);
1427
1428 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1429 tt_num_changes);
1430 atomic_set(&orig_node->last_ttvn, ttvn);
1431 }
1432
1433 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1434 {
1435 struct tt_local_entry *tt_local_entry = NULL;
1436 bool ret = false;
1437
1438 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1439 if (!tt_local_entry)
1440 goto out;
1441 /* Check if the client has been logically deleted (but is kept for
1442 * consistency purpose) */
1443 if (tt_local_entry->flags & TT_CLIENT_PENDING)
1444 goto out;
1445 ret = true;
1446 out:
1447 if (tt_local_entry)
1448 tt_local_entry_free_ref(tt_local_entry);
1449 return ret;
1450 }
1451
1452 void handle_tt_response(struct bat_priv *bat_priv,
1453 struct tt_query_packet *tt_response)
1454 {
1455 struct tt_req_node *node, *safe;
1456 struct orig_node *orig_node = NULL;
1457
1458 bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1459 "ttvn %d t_size: %d [%c]\n",
1460 tt_response->src, tt_response->ttvn,
1461 tt_response->tt_data,
1462 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1463
1464 orig_node = orig_hash_find(bat_priv, tt_response->src);
1465 if (!orig_node)
1466 goto out;
1467
1468 if (tt_response->flags & TT_FULL_TABLE)
1469 tt_fill_gtable(bat_priv, tt_response);
1470 else
1471 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1472 tt_response->ttvn,
1473 (struct tt_change *)(tt_response + 1));
1474
1475 /* Delete the tt_req_node from pending tt_requests list */
1476 spin_lock_bh(&bat_priv->tt_req_list_lock);
1477 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1478 if (!compare_eth(node->addr, tt_response->src))
1479 continue;
1480 list_del(&node->list);
1481 kfree(node);
1482 }
1483 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1484
1485 /* Recalculate the CRC for this orig_node and store it */
1486 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1487 /* Roaming phase is over: tables are in sync again. I can
1488 * unset the flag */
1489 orig_node->tt_poss_change = false;
1490 out:
1491 if (orig_node)
1492 orig_node_free_ref(orig_node);
1493 }
1494
1495 int tt_init(struct bat_priv *bat_priv)
1496 {
1497 if (!tt_local_init(bat_priv))
1498 return 0;
1499
1500 if (!tt_global_init(bat_priv))
1501 return 0;
1502
1503 tt_start_timer(bat_priv);
1504
1505 return 1;
1506 }
1507
1508 static void tt_roam_list_free(struct bat_priv *bat_priv)
1509 {
1510 struct tt_roam_node *node, *safe;
1511
1512 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1513
1514 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1515 list_del(&node->list);
1516 kfree(node);
1517 }
1518
1519 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1520 }
1521
1522 static void tt_roam_purge(struct bat_priv *bat_priv)
1523 {
1524 struct tt_roam_node *node, *safe;
1525
1526 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1527 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1528 if (!is_out_of_time(node->first_time,
1529 ROAMING_MAX_TIME * 1000))
1530 continue;
1531
1532 list_del(&node->list);
1533 kfree(node);
1534 }
1535 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1536 }
1537
1538 /* This function checks whether the client already reached the
1539 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1540 * will not be sent.
1541 *
1542 * returns true if the ROAMING_ADV can be sent, false otherwise */
1543 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1544 uint8_t *client)
1545 {
1546 struct tt_roam_node *tt_roam_node;
1547 bool ret = false;
1548
1549 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1550 /* The new tt_req will be issued only if I'm not waiting for a
1551 * reply from the same orig_node yet */
1552 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1553 if (!compare_eth(tt_roam_node->addr, client))
1554 continue;
1555
1556 if (is_out_of_time(tt_roam_node->first_time,
1557 ROAMING_MAX_TIME * 1000))
1558 continue;
1559
1560 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1561 /* Sorry, you roamed too many times! */
1562 goto unlock;
1563 ret = true;
1564 break;
1565 }
1566
1567 if (!ret) {
1568 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1569 if (!tt_roam_node)
1570 goto unlock;
1571
1572 tt_roam_node->first_time = jiffies;
1573 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1574 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1575
1576 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1577 ret = true;
1578 }
1579
1580 unlock:
1581 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1582 return ret;
1583 }
1584
1585 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1586 struct orig_node *orig_node)
1587 {
1588 struct neigh_node *neigh_node = NULL;
1589 struct sk_buff *skb = NULL;
1590 struct roam_adv_packet *roam_adv_packet;
1591 int ret = 1;
1592 struct hard_iface *primary_if;
1593
1594 /* before going on we have to check whether the client has
1595 * already roamed to us too many times */
1596 if (!tt_check_roam_count(bat_priv, client))
1597 goto out;
1598
1599 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1600 if (!skb)
1601 goto out;
1602
1603 skb_reserve(skb, ETH_HLEN);
1604
1605 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1606 sizeof(struct roam_adv_packet));
1607
1608 roam_adv_packet->packet_type = BAT_ROAM_ADV;
1609 roam_adv_packet->version = COMPAT_VERSION;
1610 roam_adv_packet->ttl = TTL;
1611 primary_if = primary_if_get_selected(bat_priv);
1612 if (!primary_if)
1613 goto out;
1614 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1615 hardif_free_ref(primary_if);
1616 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1617 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1618
1619 neigh_node = orig_node_get_router(orig_node);
1620 if (!neigh_node)
1621 goto out;
1622
1623 bat_dbg(DBG_TT, bat_priv,
1624 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1625 orig_node->orig, client, neigh_node->addr);
1626
1627 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1628 ret = 0;
1629
1630 out:
1631 if (neigh_node)
1632 neigh_node_free_ref(neigh_node);
1633 if (ret)
1634 kfree_skb(skb);
1635 return;
1636 }
1637
1638 static void tt_purge(struct work_struct *work)
1639 {
1640 struct delayed_work *delayed_work =
1641 container_of(work, struct delayed_work, work);
1642 struct bat_priv *bat_priv =
1643 container_of(delayed_work, struct bat_priv, tt_work);
1644
1645 tt_local_purge(bat_priv);
1646 tt_global_roam_purge(bat_priv);
1647 tt_req_purge(bat_priv);
1648 tt_roam_purge(bat_priv);
1649
1650 tt_start_timer(bat_priv);
1651 }
1652
1653 void tt_free(struct bat_priv *bat_priv)
1654 {
1655 cancel_delayed_work_sync(&bat_priv->tt_work);
1656
1657 tt_local_table_free(bat_priv);
1658 tt_global_table_free(bat_priv);
1659 tt_req_list_free(bat_priv);
1660 tt_changes_list_free(bat_priv);
1661 tt_roam_list_free(bat_priv);
1662
1663 kfree(bat_priv->tt_buff);
1664 }
1665
1666 /* This function will reset the specified flags from all the entries in
1667 * the given hash table and will increment num_local_tt for each involved
1668 * entry */
1669 static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
1670 {
1671 int i;
1672 struct hashtable_t *hash = bat_priv->tt_local_hash;
1673 struct hlist_head *head;
1674 struct hlist_node *node;
1675 struct tt_local_entry *tt_local_entry;
1676
1677 if (!hash)
1678 return;
1679
1680 for (i = 0; i < hash->size; i++) {
1681 head = &hash->table[i];
1682
1683 rcu_read_lock();
1684 hlist_for_each_entry_rcu(tt_local_entry, node,
1685 head, hash_entry) {
1686 if (!(tt_local_entry->flags & flags))
1687 continue;
1688 tt_local_entry->flags &= ~flags;
1689 atomic_inc(&bat_priv->num_local_tt);
1690 }
1691 rcu_read_unlock();
1692 }
1693
1694 }
1695
1696 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1697 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1698 {
1699 struct hashtable_t *hash = bat_priv->tt_local_hash;
1700 struct tt_local_entry *tt_local_entry;
1701 struct hlist_node *node, *node_tmp;
1702 struct hlist_head *head;
1703 spinlock_t *list_lock; /* protects write access to the hash lists */
1704 int i;
1705
1706 if (!hash)
1707 return;
1708
1709 for (i = 0; i < hash->size; i++) {
1710 head = &hash->table[i];
1711 list_lock = &hash->list_locks[i];
1712
1713 spin_lock_bh(list_lock);
1714 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
1715 head, hash_entry) {
1716 if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
1717 continue;
1718
1719 bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1720 "(%pM): pending\n", tt_local_entry->addr);
1721
1722 atomic_dec(&bat_priv->num_local_tt);
1723 hlist_del_rcu(node);
1724 tt_local_entry_free_ref(tt_local_entry);
1725 }
1726 spin_unlock_bh(list_lock);
1727 }
1728
1729 }
1730
1731 void tt_commit_changes(struct bat_priv *bat_priv)
1732 {
1733 tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
1734 tt_local_purge_pending_clients(bat_priv);
1735
1736 /* Increment the TTVN only once per OGM interval */
1737 atomic_inc(&bat_priv->ttvn);
1738 bat_priv->tt_poss_change = false;
1739 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree