?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge branch 'for-linus' of git://github.com/dtor/input
[linux-btrfs-devel.git] / net / batman-adv / translation-table.c
blobfb6931d00cd7f3ae73f46a354f62ce7e82613360
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_ref(struct tt_global_entry *tt_global_entry)
141 {
142 if (atomic_dec_and_test(&tt_global_entry->refcount))
143 kfree_rcu(tt_global_entry, rcu);
144 }
145
146 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
147 uint8_t flags)
148 {
149 struct tt_change_node *tt_change_node;
150
151 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
152
153 if (!tt_change_node)
154 return;
155
156 tt_change_node->change.flags = flags;
157 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
158
159 spin_lock_bh(&bat_priv->tt_changes_list_lock);
160 /* track the change in the OGMinterval list */
161 list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
162 atomic_inc(&bat_priv->tt_local_changes);
163 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
164
165 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
166 }
167
168 int tt_len(int changes_num)
169 {
170 return changes_num * sizeof(struct tt_change);
171 }
172
173 static int tt_local_init(struct bat_priv *bat_priv)
174 {
175 if (bat_priv->tt_local_hash)
176 return 1;
177
178 bat_priv->tt_local_hash = hash_new(1024);
179
180 if (!bat_priv->tt_local_hash)
181 return 0;
182
183 return 1;
184 }
185
186 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
187 {
188 struct bat_priv *bat_priv = netdev_priv(soft_iface);
189 struct tt_local_entry *tt_local_entry = NULL;
190 struct tt_global_entry *tt_global_entry = NULL;
191
192 tt_local_entry = tt_local_hash_find(bat_priv, addr);
193
194 if (tt_local_entry) {
195 tt_local_entry->last_seen = jiffies;
196 goto out;
197 }
198
199 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
200 if (!tt_local_entry)
201 goto out;
202
203 bat_dbg(DBG_TT, bat_priv,
204 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
205 (uint8_t)atomic_read(&bat_priv->ttvn));
206
207 memcpy(tt_local_entry->addr, addr, ETH_ALEN);
208 tt_local_entry->last_seen = jiffies;
209 tt_local_entry->flags = NO_FLAGS;
210 atomic_set(&tt_local_entry->refcount, 2);
211
212 /* the batman interface mac address should never be purged */
213 if (compare_eth(addr, soft_iface->dev_addr))
214 tt_local_entry->flags |= TT_CLIENT_NOPURGE;
215
216 tt_local_event(bat_priv, addr, tt_local_entry->flags);
217
218 /* The local entry has to be marked as NEW to avoid to send it in
219 * a full table response going out before the next ttvn increment
220 * (consistency check) */
221 tt_local_entry->flags |= TT_CLIENT_NEW;
222
223 hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
224 tt_local_entry, &tt_local_entry->hash_entry);
225
226 /* remove address from global hash if present */
227 tt_global_entry = tt_global_hash_find(bat_priv, addr);
228
229 /* Check whether it is a roaming! */
230 if (tt_global_entry) {
231 /* This node is probably going to update its tt table */
232 tt_global_entry->orig_node->tt_poss_change = true;
233 /* The global entry has to be marked as PENDING and has to be
234 * kept for consistency purpose */
235 tt_global_entry->flags |= TT_CLIENT_PENDING;
236 send_roam_adv(bat_priv, tt_global_entry->addr,
237 tt_global_entry->orig_node);
238 }
239 out:
240 if (tt_local_entry)
241 tt_local_entry_free_ref(tt_local_entry);
242 if (tt_global_entry)
243 tt_global_entry_free_ref(tt_global_entry);
244 }
245
246 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
247 unsigned char *buff, int buff_len)
248 {
249 int count = 0, tot_changes = 0;
250 struct tt_change_node *entry, *safe;
251
252 if (buff_len > 0)
253 tot_changes = buff_len / tt_len(1);
254
255 spin_lock_bh(&bat_priv->tt_changes_list_lock);
256 atomic_set(&bat_priv->tt_local_changes, 0);
257
258 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
259 list) {
260 if (count < tot_changes) {
261 memcpy(buff + tt_len(count),
262 &entry->change, sizeof(struct tt_change));
263 count++;
264 }
265 list_del(&entry->list);
266 kfree(entry);
267 }
268 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
269
270 /* Keep the buffer for possible tt_request */
271 spin_lock_bh(&bat_priv->tt_buff_lock);
272 kfree(bat_priv->tt_buff);
273 bat_priv->tt_buff_len = 0;
274 bat_priv->tt_buff = NULL;
275 /* We check whether this new OGM has no changes due to size
276 * problems */
277 if (buff_len > 0) {
278 /**
279 * if kmalloc() fails we will reply with the full table
280 * instead of providing the diff
281 */
282 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
283 if (bat_priv->tt_buff) {
284 memcpy(bat_priv->tt_buff, buff, buff_len);
285 bat_priv->tt_buff_len = buff_len;
286 }
287 }
288 spin_unlock_bh(&bat_priv->tt_buff_lock);
289
290 return tot_changes;
291 }
292
293 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
294 {
295 struct net_device *net_dev = (struct net_device *)seq->private;
296 struct bat_priv *bat_priv = netdev_priv(net_dev);
297 struct hashtable_t *hash = bat_priv->tt_local_hash;
298 struct tt_local_entry *tt_local_entry;
299 struct hard_iface *primary_if;
300 struct hlist_node *node;
301 struct hlist_head *head;
302 size_t buf_size, pos;
303 char *buff;
304 int i, ret = 0;
305
306 primary_if = primary_if_get_selected(bat_priv);
307 if (!primary_if) {
308 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
309 "please specify interfaces to enable it\n",
310 net_dev->name);
311 goto out;
312 }
313
314 if (primary_if->if_status != IF_ACTIVE) {
315 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
316 "primary interface not active\n",
317 net_dev->name);
318 goto out;
319 }
320
321 seq_printf(seq, "Locally retrieved addresses (from %s) "
322 "announced via TT (TTVN: %u):\n",
323 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
324
325 buf_size = 1;
326 /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
327 for (i = 0; i < hash->size; i++) {
328 head = &hash->table[i];
329
330 rcu_read_lock();
331 __hlist_for_each_rcu(node, head)
332 buf_size += 21;
333 rcu_read_unlock();
334 }
335
336 buff = kmalloc(buf_size, GFP_ATOMIC);
337 if (!buff) {
338 ret = -ENOMEM;
339 goto out;
340 }
341
342 buff[0] = '\0';
343 pos = 0;
344
345 for (i = 0; i < hash->size; i++) {
346 head = &hash->table[i];
347
348 rcu_read_lock();
349 hlist_for_each_entry_rcu(tt_local_entry, node,
350 head, hash_entry) {
351 pos += snprintf(buff + pos, 22, " * %pM\n",
352 tt_local_entry->addr);
353 }
354 rcu_read_unlock();
355 }
356
357 seq_printf(seq, "%s", buff);
358 kfree(buff);
359 out:
360 if (primary_if)
361 hardif_free_ref(primary_if);
362 return ret;
363 }
364
365 static void tt_local_set_pending(struct bat_priv *bat_priv,
366 struct tt_local_entry *tt_local_entry,
367 uint16_t flags)
368 {
369 tt_local_event(bat_priv, tt_local_entry->addr,
370 tt_local_entry->flags | flags);
371
372 /* The local client has to be merked as "pending to be removed" but has
373 * to be kept in the table in order to send it in an full tables
374 * response issued before the net ttvn increment (consistency check) */
375 tt_local_entry->flags |= TT_CLIENT_PENDING;
376 }
377
378 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
379 const char *message, bool roaming)
380 {
381 struct tt_local_entry *tt_local_entry = NULL;
382
383 tt_local_entry = tt_local_hash_find(bat_priv, addr);
384 if (!tt_local_entry)
385 goto out;
386
387 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
388 (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
389
390 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
391 "%s\n", tt_local_entry->addr, message);
392 out:
393 if (tt_local_entry)
394 tt_local_entry_free_ref(tt_local_entry);
395 }
396
397 static void tt_local_purge(struct bat_priv *bat_priv)
398 {
399 struct hashtable_t *hash = bat_priv->tt_local_hash;
400 struct tt_local_entry *tt_local_entry;
401 struct hlist_node *node, *node_tmp;
402 struct hlist_head *head;
403 spinlock_t *list_lock; /* protects write access to the hash lists */
404 int i;
405
406 for (i = 0; i < hash->size; i++) {
407 head = &hash->table[i];
408 list_lock = &hash->list_locks[i];
409
410 spin_lock_bh(list_lock);
411 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
412 head, hash_entry) {
413 if (tt_local_entry->flags & TT_CLIENT_NOPURGE)
414 continue;
415
416 /* entry already marked for deletion */
417 if (tt_local_entry->flags & TT_CLIENT_PENDING)
418 continue;
419
420 if (!is_out_of_time(tt_local_entry->last_seen,
421 TT_LOCAL_TIMEOUT * 1000))
422 continue;
423
424 tt_local_set_pending(bat_priv, tt_local_entry,
425 TT_CLIENT_DEL);
426 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
427 "pending to be removed: timed out\n",
428 tt_local_entry->addr);
429 }
430 spin_unlock_bh(list_lock);
431 }
432
433 }
434
435 static void tt_local_table_free(struct bat_priv *bat_priv)
436 {
437 struct hashtable_t *hash;
438 spinlock_t *list_lock; /* protects write access to the hash lists */
439 struct tt_local_entry *tt_local_entry;
440 struct hlist_node *node, *node_tmp;
441 struct hlist_head *head;
442 int i;
443
444 if (!bat_priv->tt_local_hash)
445 return;
446
447 hash = bat_priv->tt_local_hash;
448
449 for (i = 0; i < hash->size; i++) {
450 head = &hash->table[i];
451 list_lock = &hash->list_locks[i];
452
453 spin_lock_bh(list_lock);
454 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
455 head, hash_entry) {
456 hlist_del_rcu(node);
457 tt_local_entry_free_ref(tt_local_entry);
458 }
459 spin_unlock_bh(list_lock);
460 }
461
462 hash_destroy(hash);
463
464 bat_priv->tt_local_hash = NULL;
465 }
466
467 static int tt_global_init(struct bat_priv *bat_priv)
468 {
469 if (bat_priv->tt_global_hash)
470 return 1;
471
472 bat_priv->tt_global_hash = hash_new(1024);
473
474 if (!bat_priv->tt_global_hash)
475 return 0;
476
477 return 1;
478 }
479
480 static void tt_changes_list_free(struct bat_priv *bat_priv)
481 {
482 struct tt_change_node *entry, *safe;
483
484 spin_lock_bh(&bat_priv->tt_changes_list_lock);
485
486 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
487 list) {
488 list_del(&entry->list);
489 kfree(entry);
490 }
491
492 atomic_set(&bat_priv->tt_local_changes, 0);
493 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
494 }
495
496 /* caller must hold orig_node refcount */
497 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
498 const unsigned char *tt_addr, uint8_t ttvn, bool roaming)
499 {
500 struct tt_global_entry *tt_global_entry;
501 struct orig_node *orig_node_tmp;
502 int ret = 0;
503
504 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
505
506 if (!tt_global_entry) {
507 tt_global_entry =
508 kmalloc(sizeof(*tt_global_entry),
509 GFP_ATOMIC);
510 if (!tt_global_entry)
511 goto out;
512
513 memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
514 /* Assign the new orig_node */
515 atomic_inc(&orig_node->refcount);
516 tt_global_entry->orig_node = orig_node;
517 tt_global_entry->ttvn = ttvn;
518 tt_global_entry->flags = NO_FLAGS;
519 tt_global_entry->roam_at = 0;
520 atomic_set(&tt_global_entry->refcount, 2);
521
522 hash_add(bat_priv->tt_global_hash, compare_gtt,
523 choose_orig, tt_global_entry,
524 &tt_global_entry->hash_entry);
525 atomic_inc(&orig_node->tt_size);
526 } else {
527 if (tt_global_entry->orig_node != orig_node) {
528 atomic_dec(&tt_global_entry->orig_node->tt_size);
529 orig_node_tmp = tt_global_entry->orig_node;
530 atomic_inc(&orig_node->refcount);
531 tt_global_entry->orig_node = orig_node;
532 orig_node_free_ref(orig_node_tmp);
533 atomic_inc(&orig_node->tt_size);
534 }
535 tt_global_entry->ttvn = ttvn;
536 tt_global_entry->flags = NO_FLAGS;
537 tt_global_entry->roam_at = 0;
538 }
539
540 bat_dbg(DBG_TT, bat_priv,
541 "Creating new global tt entry: %pM (via %pM)\n",
542 tt_global_entry->addr, orig_node->orig);
543
544 /* remove address from local hash if present */
545 tt_local_remove(bat_priv, tt_global_entry->addr,
546 "global tt received", roaming);
547 ret = 1;
548 out:
549 if (tt_global_entry)
550 tt_global_entry_free_ref(tt_global_entry);
551 return ret;
552 }
553
554 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
555 {
556 struct net_device *net_dev = (struct net_device *)seq->private;
557 struct bat_priv *bat_priv = netdev_priv(net_dev);
558 struct hashtable_t *hash = bat_priv->tt_global_hash;
559 struct tt_global_entry *tt_global_entry;
560 struct hard_iface *primary_if;
561 struct hlist_node *node;
562 struct hlist_head *head;
563 size_t buf_size, pos;
564 char *buff;
565 int i, ret = 0;
566
567 primary_if = primary_if_get_selected(bat_priv);
568 if (!primary_if) {
569 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
570 "specify interfaces to enable it\n",
571 net_dev->name);
572 goto out;
573 }
574
575 if (primary_if->if_status != IF_ACTIVE) {
576 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
577 "primary interface not active\n",
578 net_dev->name);
579 goto out;
580 }
581
582 seq_printf(seq,
583 "Globally announced TT entries received via the mesh %s\n",
584 net_dev->name);
585 seq_printf(seq, " %-13s %s %-15s %s\n",
586 "Client", "(TTVN)", "Originator", "(Curr TTVN)");
587
588 buf_size = 1;
589 /* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
590 * xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
591 for (i = 0; i < hash->size; i++) {
592 head = &hash->table[i];
593
594 rcu_read_lock();
595 __hlist_for_each_rcu(node, head)
596 buf_size += 59;
597 rcu_read_unlock();
598 }
599
600 buff = kmalloc(buf_size, GFP_ATOMIC);
601 if (!buff) {
602 ret = -ENOMEM;
603 goto out;
604 }
605
606 buff[0] = '\0';
607 pos = 0;
608
609 for (i = 0; i < hash->size; i++) {
610 head = &hash->table[i];
611
612 rcu_read_lock();
613 hlist_for_each_entry_rcu(tt_global_entry, node,
614 head, hash_entry) {
615 pos += snprintf(buff + pos, 61,
616 " * %pM (%3u) via %pM (%3u)\n",
617 tt_global_entry->addr,
618 tt_global_entry->ttvn,
619 tt_global_entry->orig_node->orig,
620 (uint8_t) atomic_read(
621 &tt_global_entry->orig_node->
622 last_ttvn));
623 }
624 rcu_read_unlock();
625 }
626
627 seq_printf(seq, "%s", buff);
628 kfree(buff);
629 out:
630 if (primary_if)
631 hardif_free_ref(primary_if);
632 return ret;
633 }
634
635 static void _tt_global_del(struct bat_priv *bat_priv,
636 struct tt_global_entry *tt_global_entry,
637 const char *message)
638 {
639 if (!tt_global_entry)
640 goto out;
641
642 bat_dbg(DBG_TT, bat_priv,
643 "Deleting global tt entry %pM (via %pM): %s\n",
644 tt_global_entry->addr, tt_global_entry->orig_node->orig,
645 message);
646
647 atomic_dec(&tt_global_entry->orig_node->tt_size);
648
649 hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
650 tt_global_entry->addr);
651 out:
652 if (tt_global_entry)
653 tt_global_entry_free_ref(tt_global_entry);
654 }
655
656 void tt_global_del(struct bat_priv *bat_priv,
657 struct orig_node *orig_node, const unsigned char *addr,
658 const char *message, bool roaming)
659 {
660 struct tt_global_entry *tt_global_entry = NULL;
661
662 tt_global_entry = tt_global_hash_find(bat_priv, addr);
663 if (!tt_global_entry)
664 goto out;
665
666 if (tt_global_entry->orig_node == orig_node) {
667 if (roaming) {
668 tt_global_entry->flags |= TT_CLIENT_ROAM;
669 tt_global_entry->roam_at = jiffies;
670 goto out;
671 }
672 _tt_global_del(bat_priv, tt_global_entry, message);
673 }
674 out:
675 if (tt_global_entry)
676 tt_global_entry_free_ref(tt_global_entry);
677 }
678
679 void tt_global_del_orig(struct bat_priv *bat_priv,
680 struct orig_node *orig_node, const char *message)
681 {
682 struct tt_global_entry *tt_global_entry;
683 int i;
684 struct hashtable_t *hash = bat_priv->tt_global_hash;
685 struct hlist_node *node, *safe;
686 struct hlist_head *head;
687 spinlock_t *list_lock; /* protects write access to the hash lists */
688
689 for (i = 0; i < hash->size; i++) {
690 head = &hash->table[i];
691 list_lock = &hash->list_locks[i];
692
693 spin_lock_bh(list_lock);
694 hlist_for_each_entry_safe(tt_global_entry, node, safe,
695 head, hash_entry) {
696 if (tt_global_entry->orig_node == orig_node) {
697 bat_dbg(DBG_TT, bat_priv,
698 "Deleting global tt entry %pM "
699 "(via %pM): originator time out\n",
700 tt_global_entry->addr,
701 tt_global_entry->orig_node->orig);
702 hlist_del_rcu(node);
703 tt_global_entry_free_ref(tt_global_entry);
704 }
705 }
706 spin_unlock_bh(list_lock);
707 }
708 atomic_set(&orig_node->tt_size, 0);
709 }
710
711 static void tt_global_roam_purge(struct bat_priv *bat_priv)
712 {
713 struct hashtable_t *hash = bat_priv->tt_global_hash;
714 struct tt_global_entry *tt_global_entry;
715 struct hlist_node *node, *node_tmp;
716 struct hlist_head *head;
717 spinlock_t *list_lock; /* protects write access to the hash lists */
718 int i;
719
720 for (i = 0; i < hash->size; i++) {
721 head = &hash->table[i];
722 list_lock = &hash->list_locks[i];
723
724 spin_lock_bh(list_lock);
725 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
726 head, hash_entry) {
727 if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
728 continue;
729 if (!is_out_of_time(tt_global_entry->roam_at,
730 TT_CLIENT_ROAM_TIMEOUT * 1000))
731 continue;
732
733 bat_dbg(DBG_TT, bat_priv, "Deleting global "
734 "tt entry (%pM): Roaming timeout\n",
735 tt_global_entry->addr);
736 atomic_dec(&tt_global_entry->orig_node->tt_size);
737 hlist_del_rcu(node);
738 tt_global_entry_free_ref(tt_global_entry);
739 }
740 spin_unlock_bh(list_lock);
741 }
742
743 }
744
745 static void tt_global_table_free(struct bat_priv *bat_priv)
746 {
747 struct hashtable_t *hash;
748 spinlock_t *list_lock; /* protects write access to the hash lists */
749 struct tt_global_entry *tt_global_entry;
750 struct hlist_node *node, *node_tmp;
751 struct hlist_head *head;
752 int i;
753
754 if (!bat_priv->tt_global_hash)
755 return;
756
757 hash = bat_priv->tt_global_hash;
758
759 for (i = 0; i < hash->size; i++) {
760 head = &hash->table[i];
761 list_lock = &hash->list_locks[i];
762
763 spin_lock_bh(list_lock);
764 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
765 head, hash_entry) {
766 hlist_del_rcu(node);
767 tt_global_entry_free_ref(tt_global_entry);
768 }
769 spin_unlock_bh(list_lock);
770 }
771
772 hash_destroy(hash);
773
774 bat_priv->tt_global_hash = NULL;
775 }
776
777 struct orig_node *transtable_search(struct bat_priv *bat_priv,
778 const uint8_t *addr)
779 {
780 struct tt_global_entry *tt_global_entry;
781 struct orig_node *orig_node = NULL;
782
783 tt_global_entry = tt_global_hash_find(bat_priv, addr);
784
785 if (!tt_global_entry)
786 goto out;
787
788 if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
789 goto free_tt;
790
791 /* A global client marked as PENDING has already moved from that
792 * originator */
793 if (tt_global_entry->flags & TT_CLIENT_PENDING)
794 goto free_tt;
795
796 orig_node = tt_global_entry->orig_node;
797
798 free_tt:
799 tt_global_entry_free_ref(tt_global_entry);
800 out:
801 return orig_node;
802 }
803
804 /* Calculates the checksum of the local table of a given orig_node */
805 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
806 {
807 uint16_t total = 0, total_one;
808 struct hashtable_t *hash = bat_priv->tt_global_hash;
809 struct tt_global_entry *tt_global_entry;
810 struct hlist_node *node;
811 struct hlist_head *head;
812 int i, j;
813
814 for (i = 0; i < hash->size; i++) {
815 head = &hash->table[i];
816
817 rcu_read_lock();
818 hlist_for_each_entry_rcu(tt_global_entry, node,
819 head, hash_entry) {
820 if (compare_eth(tt_global_entry->orig_node,
821 orig_node)) {
822 /* Roaming clients are in the global table for
823 * consistency only. They don't have to be
824 * taken into account while computing the
825 * global crc */
826 if (tt_global_entry->flags & TT_CLIENT_ROAM)
827 continue;
828 total_one = 0;
829 for (j = 0; j < ETH_ALEN; j++)
830 total_one = crc16_byte(total_one,
831 tt_global_entry->addr[j]);
832 total ^= total_one;
833 }
834 }
835 rcu_read_unlock();
836 }
837
838 return total;
839 }
840
841 /* Calculates the checksum of the local table */
842 uint16_t tt_local_crc(struct bat_priv *bat_priv)
843 {
844 uint16_t total = 0, total_one;
845 struct hashtable_t *hash = bat_priv->tt_local_hash;
846 struct tt_local_entry *tt_local_entry;
847 struct hlist_node *node;
848 struct hlist_head *head;
849 int i, j;
850
851 for (i = 0; i < hash->size; i++) {
852 head = &hash->table[i];
853
854 rcu_read_lock();
855 hlist_for_each_entry_rcu(tt_local_entry, node,
856 head, hash_entry) {
857 /* not yet committed clients have not to be taken into
858 * account while computing the CRC */
859 if (tt_local_entry->flags & TT_CLIENT_NEW)
860 continue;
861 total_one = 0;
862 for (j = 0; j < ETH_ALEN; j++)
863 total_one = crc16_byte(total_one,
864 tt_local_entry->addr[j]);
865 total ^= total_one;
866 }
867 rcu_read_unlock();
868 }
869
870 return total;
871 }
872
873 static void tt_req_list_free(struct bat_priv *bat_priv)
874 {
875 struct tt_req_node *node, *safe;
876
877 spin_lock_bh(&bat_priv->tt_req_list_lock);
878
879 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
880 list_del(&node->list);
881 kfree(node);
882 }
883
884 spin_unlock_bh(&bat_priv->tt_req_list_lock);
885 }
886
887 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
888 const unsigned char *tt_buff, uint8_t tt_num_changes)
889 {
890 uint16_t tt_buff_len = tt_len(tt_num_changes);
891
892 /* Replace the old buffer only if I received something in the
893 * last OGM (the OGM could carry no changes) */
894 spin_lock_bh(&orig_node->tt_buff_lock);
895 if (tt_buff_len > 0) {
896 kfree(orig_node->tt_buff);
897 orig_node->tt_buff_len = 0;
898 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
899 if (orig_node->tt_buff) {
900 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
901 orig_node->tt_buff_len = tt_buff_len;
902 }
903 }
904 spin_unlock_bh(&orig_node->tt_buff_lock);
905 }
906
907 static void tt_req_purge(struct bat_priv *bat_priv)
908 {
909 struct tt_req_node *node, *safe;
910
911 spin_lock_bh(&bat_priv->tt_req_list_lock);
912 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
913 if (is_out_of_time(node->issued_at,
914 TT_REQUEST_TIMEOUT * 1000)) {
915 list_del(&node->list);
916 kfree(node);
917 }
918 }
919 spin_unlock_bh(&bat_priv->tt_req_list_lock);
920 }
921
922 /* returns the pointer to the new tt_req_node struct if no request
923 * has already been issued for this orig_node, NULL otherwise */
924 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
925 struct orig_node *orig_node)
926 {
927 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
928
929 spin_lock_bh(&bat_priv->tt_req_list_lock);
930 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
931 if (compare_eth(tt_req_node_tmp, orig_node) &&
932 !is_out_of_time(tt_req_node_tmp->issued_at,
933 TT_REQUEST_TIMEOUT * 1000))
934 goto unlock;
935 }
936
937 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
938 if (!tt_req_node)
939 goto unlock;
940
941 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
942 tt_req_node->issued_at = jiffies;
943
944 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
945 unlock:
946 spin_unlock_bh(&bat_priv->tt_req_list_lock);
947 return tt_req_node;
948 }
949
950 /* data_ptr is useless here, but has to be kept to respect the prototype */
951 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
952 {
953 const struct tt_local_entry *tt_local_entry = entry_ptr;
954
955 if (tt_local_entry->flags & TT_CLIENT_NEW)
956 return 0;
957 return 1;
958 }
959
960 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
961 {
962 const struct tt_global_entry *tt_global_entry = entry_ptr;
963 const struct orig_node *orig_node = data_ptr;
964
965 if (tt_global_entry->flags & TT_CLIENT_ROAM)
966 return 0;
967
968 return (tt_global_entry->orig_node == orig_node);
969 }
970
971 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
972 struct hashtable_t *hash,
973 struct hard_iface *primary_if,
974 int (*valid_cb)(const void *,
975 const void *),
976 void *cb_data)
977 {
978 struct tt_local_entry *tt_local_entry;
979 struct tt_query_packet *tt_response;
980 struct tt_change *tt_change;
981 struct hlist_node *node;
982 struct hlist_head *head;
983 struct sk_buff *skb = NULL;
984 uint16_t tt_tot, tt_count;
985 ssize_t tt_query_size = sizeof(struct tt_query_packet);
986 int i;
987
988 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
989 tt_len = primary_if->soft_iface->mtu - tt_query_size;
990 tt_len -= tt_len % sizeof(struct tt_change);
991 }
992 tt_tot = tt_len / sizeof(struct tt_change);
993
994 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
995 if (!skb)
996 goto out;
997
998 skb_reserve(skb, ETH_HLEN);
999 tt_response = (struct tt_query_packet *)skb_put(skb,
1000 tt_query_size + tt_len);
1001 tt_response->ttvn = ttvn;
1002 tt_response->tt_data = htons(tt_tot);
1003
1004 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1005 tt_count = 0;
1006
1007 rcu_read_lock();
1008 for (i = 0; i < hash->size; i++) {
1009 head = &hash->table[i];
1010
1011 hlist_for_each_entry_rcu(tt_local_entry, node,
1012 head, hash_entry) {
1013 if (tt_count == tt_tot)
1014 break;
1015
1016 if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
1017 continue;
1018
1019 memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
1020 tt_change->flags = NO_FLAGS;
1021
1022 tt_count++;
1023 tt_change++;
1024 }
1025 }
1026 rcu_read_unlock();
1027
1028 out:
1029 return skb;
1030 }
1031
1032 int send_tt_request(struct bat_priv *bat_priv, struct orig_node *dst_orig_node,
1033 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1034 {
1035 struct sk_buff *skb = NULL;
1036 struct tt_query_packet *tt_request;
1037 struct neigh_node *neigh_node = NULL;
1038 struct hard_iface *primary_if;
1039 struct tt_req_node *tt_req_node = NULL;
1040 int ret = 1;
1041
1042 primary_if = primary_if_get_selected(bat_priv);
1043 if (!primary_if)
1044 goto out;
1045
1046 /* The new tt_req will be issued only if I'm not waiting for a
1047 * reply from the same orig_node yet */
1048 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1049 if (!tt_req_node)
1050 goto out;
1051
1052 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1053 if (!skb)
1054 goto out;
1055
1056 skb_reserve(skb, ETH_HLEN);
1057
1058 tt_request = (struct tt_query_packet *)skb_put(skb,
1059 sizeof(struct tt_query_packet));
1060
1061 tt_request->packet_type = BAT_TT_QUERY;
1062 tt_request->version = COMPAT_VERSION;
1063 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1064 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1065 tt_request->ttl = TTL;
1066 tt_request->ttvn = ttvn;
1067 tt_request->tt_data = tt_crc;
1068 tt_request->flags = TT_REQUEST;
1069
1070 if (full_table)
1071 tt_request->flags |= TT_FULL_TABLE;
1072
1073 neigh_node = orig_node_get_router(dst_orig_node);
1074 if (!neigh_node)
1075 goto out;
1076
1077 bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1078 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1079 (full_table ? 'F' : '.'));
1080
1081 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1082 ret = 0;
1083
1084 out:
1085 if (neigh_node)
1086 neigh_node_free_ref(neigh_node);
1087 if (primary_if)
1088 hardif_free_ref(primary_if);
1089 if (ret)
1090 kfree_skb(skb);
1091 if (ret && tt_req_node) {
1092 spin_lock_bh(&bat_priv->tt_req_list_lock);
1093 list_del(&tt_req_node->list);
1094 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1095 kfree(tt_req_node);
1096 }
1097 return ret;
1098 }
1099
1100 static bool send_other_tt_response(struct bat_priv *bat_priv,
1101 struct tt_query_packet *tt_request)
1102 {
1103 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1104 struct neigh_node *neigh_node = NULL;
1105 struct hard_iface *primary_if = NULL;
1106 uint8_t orig_ttvn, req_ttvn, ttvn;
1107 int ret = false;
1108 unsigned char *tt_buff;
1109 bool full_table;
1110 uint16_t tt_len, tt_tot;
1111 struct sk_buff *skb = NULL;
1112 struct tt_query_packet *tt_response;
1113
1114 bat_dbg(DBG_TT, bat_priv,
1115 "Received TT_REQUEST from %pM for "
1116 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1117 tt_request->ttvn, tt_request->dst,
1118 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1119
1120 /* Let's get the orig node of the REAL destination */
1121 req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
1122 if (!req_dst_orig_node)
1123 goto out;
1124
1125 res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
1126 if (!res_dst_orig_node)
1127 goto out;
1128
1129 neigh_node = orig_node_get_router(res_dst_orig_node);
1130 if (!neigh_node)
1131 goto out;
1132
1133 primary_if = primary_if_get_selected(bat_priv);
1134 if (!primary_if)
1135 goto out;
1136
1137 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1138 req_ttvn = tt_request->ttvn;
1139
1140 /* I have not the requested data */
1141 if (orig_ttvn != req_ttvn ||
1142 tt_request->tt_data != req_dst_orig_node->tt_crc)
1143 goto out;
1144
1145 /* If it has explicitly been requested the full table */
1146 if (tt_request->flags & TT_FULL_TABLE ||
1147 !req_dst_orig_node->tt_buff)
1148 full_table = true;
1149 else
1150 full_table = false;
1151
1152 /* In this version, fragmentation is not implemented, then
1153 * I'll send only one packet with as much TT entries as I can */
1154 if (!full_table) {
1155 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1156 tt_len = req_dst_orig_node->tt_buff_len;
1157 tt_tot = tt_len / sizeof(struct tt_change);
1158
1159 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1160 tt_len + ETH_HLEN);
1161 if (!skb)
1162 goto unlock;
1163
1164 skb_reserve(skb, ETH_HLEN);
1165 tt_response = (struct tt_query_packet *)skb_put(skb,
1166 sizeof(struct tt_query_packet) + tt_len);
1167 tt_response->ttvn = req_ttvn;
1168 tt_response->tt_data = htons(tt_tot);
1169
1170 tt_buff = skb->data + sizeof(struct tt_query_packet);
1171 /* Copy the last orig_node's OGM buffer */
1172 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1173 req_dst_orig_node->tt_buff_len);
1174
1175 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1176 } else {
1177 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1178 sizeof(struct tt_change);
1179 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1180
1181 skb = tt_response_fill_table(tt_len, ttvn,
1182 bat_priv->tt_global_hash,
1183 primary_if, tt_global_valid_entry,
1184 req_dst_orig_node);
1185 if (!skb)
1186 goto out;
1187
1188 tt_response = (struct tt_query_packet *)skb->data;
1189 }
1190
1191 tt_response->packet_type = BAT_TT_QUERY;
1192 tt_response->version = COMPAT_VERSION;
1193 tt_response->ttl = TTL;
1194 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1195 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1196 tt_response->flags = TT_RESPONSE;
1197
1198 if (full_table)
1199 tt_response->flags |= TT_FULL_TABLE;
1200
1201 bat_dbg(DBG_TT, bat_priv,
1202 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1203 res_dst_orig_node->orig, neigh_node->addr,
1204 req_dst_orig_node->orig, req_ttvn);
1205
1206 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1207 ret = true;
1208 goto out;
1209
1210 unlock:
1211 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1212
1213 out:
1214 if (res_dst_orig_node)
1215 orig_node_free_ref(res_dst_orig_node);
1216 if (req_dst_orig_node)
1217 orig_node_free_ref(req_dst_orig_node);
1218 if (neigh_node)
1219 neigh_node_free_ref(neigh_node);
1220 if (primary_if)
1221 hardif_free_ref(primary_if);
1222 if (!ret)
1223 kfree_skb(skb);
1224 return ret;
1225
1226 }
1227 static bool send_my_tt_response(struct bat_priv *bat_priv,
1228 struct tt_query_packet *tt_request)
1229 {
1230 struct orig_node *orig_node = NULL;
1231 struct neigh_node *neigh_node = NULL;
1232 struct hard_iface *primary_if = NULL;
1233 uint8_t my_ttvn, req_ttvn, ttvn;
1234 int ret = false;
1235 unsigned char *tt_buff;
1236 bool full_table;
1237 uint16_t tt_len, tt_tot;
1238 struct sk_buff *skb = NULL;
1239 struct tt_query_packet *tt_response;
1240
1241 bat_dbg(DBG_TT, bat_priv,
1242 "Received TT_REQUEST from %pM for "
1243 "ttvn: %u (me) [%c]\n", tt_request->src,
1244 tt_request->ttvn,
1245 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1246
1247
1248 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1249 req_ttvn = tt_request->ttvn;
1250
1251 orig_node = get_orig_node(bat_priv, tt_request->src);
1252 if (!orig_node)
1253 goto out;
1254
1255 neigh_node = orig_node_get_router(orig_node);
1256 if (!neigh_node)
1257 goto out;
1258
1259 primary_if = primary_if_get_selected(bat_priv);
1260 if (!primary_if)
1261 goto out;
1262
1263 /* If the full table has been explicitly requested or the gap
1264 * is too big send the whole local translation table */
1265 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1266 !bat_priv->tt_buff)
1267 full_table = true;
1268 else
1269 full_table = false;
1270
1271 /* In this version, fragmentation is not implemented, then
1272 * I'll send only one packet with as much TT entries as I can */
1273 if (!full_table) {
1274 spin_lock_bh(&bat_priv->tt_buff_lock);
1275 tt_len = bat_priv->tt_buff_len;
1276 tt_tot = tt_len / sizeof(struct tt_change);
1277
1278 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1279 tt_len + ETH_HLEN);
1280 if (!skb)
1281 goto unlock;
1282
1283 skb_reserve(skb, ETH_HLEN);
1284 tt_response = (struct tt_query_packet *)skb_put(skb,
1285 sizeof(struct tt_query_packet) + tt_len);
1286 tt_response->ttvn = req_ttvn;
1287 tt_response->tt_data = htons(tt_tot);
1288
1289 tt_buff = skb->data + sizeof(struct tt_query_packet);
1290 memcpy(tt_buff, bat_priv->tt_buff,
1291 bat_priv->tt_buff_len);
1292 spin_unlock_bh(&bat_priv->tt_buff_lock);
1293 } else {
1294 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1295 sizeof(struct tt_change);
1296 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1297
1298 skb = tt_response_fill_table(tt_len, ttvn,
1299 bat_priv->tt_local_hash,
1300 primary_if, tt_local_valid_entry,
1301 NULL);
1302 if (!skb)
1303 goto out;
1304
1305 tt_response = (struct tt_query_packet *)skb->data;
1306 }
1307
1308 tt_response->packet_type = BAT_TT_QUERY;
1309 tt_response->version = COMPAT_VERSION;
1310 tt_response->ttl = TTL;
1311 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1312 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1313 tt_response->flags = TT_RESPONSE;
1314
1315 if (full_table)
1316 tt_response->flags |= TT_FULL_TABLE;
1317
1318 bat_dbg(DBG_TT, bat_priv,
1319 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1320 orig_node->orig, neigh_node->addr,
1321 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1322
1323 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1324 ret = true;
1325 goto out;
1326
1327 unlock:
1328 spin_unlock_bh(&bat_priv->tt_buff_lock);
1329 out:
1330 if (orig_node)
1331 orig_node_free_ref(orig_node);
1332 if (neigh_node)
1333 neigh_node_free_ref(neigh_node);
1334 if (primary_if)
1335 hardif_free_ref(primary_if);
1336 if (!ret)
1337 kfree_skb(skb);
1338 /* This packet was for me, so it doesn't need to be re-routed */
1339 return true;
1340 }
1341
1342 bool send_tt_response(struct bat_priv *bat_priv,
1343 struct tt_query_packet *tt_request)
1344 {
1345 if (is_my_mac(tt_request->dst))
1346 return send_my_tt_response(bat_priv, tt_request);
1347 else
1348 return send_other_tt_response(bat_priv, tt_request);
1349 }
1350
1351 static void _tt_update_changes(struct bat_priv *bat_priv,
1352 struct orig_node *orig_node,
1353 struct tt_change *tt_change,
1354 uint16_t tt_num_changes, uint8_t ttvn)
1355 {
1356 int i;
1357
1358 for (i = 0; i < tt_num_changes; i++) {
1359 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1360 tt_global_del(bat_priv, orig_node,
1361 (tt_change + i)->addr,
1362 "tt removed by changes",
1363 (tt_change + i)->flags & TT_CLIENT_ROAM);
1364 else
1365 if (!tt_global_add(bat_priv, orig_node,
1366 (tt_change + i)->addr, ttvn, false))
1367 /* In case of problem while storing a
1368 * global_entry, we stop the updating
1369 * procedure without committing the
1370 * ttvn change. This will avoid to send
1371 * corrupted data on tt_request
1372 */
1373 return;
1374 }
1375 }
1376
1377 static void tt_fill_gtable(struct bat_priv *bat_priv,
1378 struct tt_query_packet *tt_response)
1379 {
1380 struct orig_node *orig_node = NULL;
1381
1382 orig_node = orig_hash_find(bat_priv, tt_response->src);
1383 if (!orig_node)
1384 goto out;
1385
1386 /* Purge the old table first.. */
1387 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1388
1389 _tt_update_changes(bat_priv, orig_node,
1390 (struct tt_change *)(tt_response + 1),
1391 tt_response->tt_data, tt_response->ttvn);
1392
1393 spin_lock_bh(&orig_node->tt_buff_lock);
1394 kfree(orig_node->tt_buff);
1395 orig_node->tt_buff_len = 0;
1396 orig_node->tt_buff = NULL;
1397 spin_unlock_bh(&orig_node->tt_buff_lock);
1398
1399 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1400
1401 out:
1402 if (orig_node)
1403 orig_node_free_ref(orig_node);
1404 }
1405
1406 void tt_update_changes(struct bat_priv *bat_priv, struct orig_node *orig_node,
1407 uint16_t tt_num_changes, uint8_t ttvn,
1408 struct tt_change *tt_change)
1409 {
1410 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1411 ttvn);
1412
1413 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1414 tt_num_changes);
1415 atomic_set(&orig_node->last_ttvn, ttvn);
1416 }
1417
1418 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1419 {
1420 struct tt_local_entry *tt_local_entry = NULL;
1421 bool ret = false;
1422
1423 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1424 if (!tt_local_entry)
1425 goto out;
1426 /* Check if the client has been logically deleted (but is kept for
1427 * consistency purpose) */
1428 if (tt_local_entry->flags & TT_CLIENT_PENDING)
1429 goto out;
1430 ret = true;
1431 out:
1432 if (tt_local_entry)
1433 tt_local_entry_free_ref(tt_local_entry);
1434 return ret;
1435 }
1436
1437 void handle_tt_response(struct bat_priv *bat_priv,
1438 struct tt_query_packet *tt_response)
1439 {
1440 struct tt_req_node *node, *safe;
1441 struct orig_node *orig_node = NULL;
1442
1443 bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1444 "ttvn %d t_size: %d [%c]\n",
1445 tt_response->src, tt_response->ttvn,
1446 tt_response->tt_data,
1447 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1448
1449 orig_node = orig_hash_find(bat_priv, tt_response->src);
1450 if (!orig_node)
1451 goto out;
1452
1453 if (tt_response->flags & TT_FULL_TABLE)
1454 tt_fill_gtable(bat_priv, tt_response);
1455 else
1456 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1457 tt_response->ttvn,
1458 (struct tt_change *)(tt_response + 1));
1459
1460 /* Delete the tt_req_node from pending tt_requests list */
1461 spin_lock_bh(&bat_priv->tt_req_list_lock);
1462 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1463 if (!compare_eth(node->addr, tt_response->src))
1464 continue;
1465 list_del(&node->list);
1466 kfree(node);
1467 }
1468 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1469
1470 /* Recalculate the CRC for this orig_node and store it */
1471 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1472 /* Roaming phase is over: tables are in sync again. I can
1473 * unset the flag */
1474 orig_node->tt_poss_change = false;
1475 out:
1476 if (orig_node)
1477 orig_node_free_ref(orig_node);
1478 }
1479
1480 int tt_init(struct bat_priv *bat_priv)
1481 {
1482 if (!tt_local_init(bat_priv))
1483 return 0;
1484
1485 if (!tt_global_init(bat_priv))
1486 return 0;
1487
1488 tt_start_timer(bat_priv);
1489
1490 return 1;
1491 }
1492
1493 static void tt_roam_list_free(struct bat_priv *bat_priv)
1494 {
1495 struct tt_roam_node *node, *safe;
1496
1497 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1498
1499 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1500 list_del(&node->list);
1501 kfree(node);
1502 }
1503
1504 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1505 }
1506
1507 static void tt_roam_purge(struct bat_priv *bat_priv)
1508 {
1509 struct tt_roam_node *node, *safe;
1510
1511 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1512 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1513 if (!is_out_of_time(node->first_time,
1514 ROAMING_MAX_TIME * 1000))
1515 continue;
1516
1517 list_del(&node->list);
1518 kfree(node);
1519 }
1520 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1521 }
1522
1523 /* This function checks whether the client already reached the
1524 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1525 * will not be sent.
1526 *
1527 * returns true if the ROAMING_ADV can be sent, false otherwise */
1528 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1529 uint8_t *client)
1530 {
1531 struct tt_roam_node *tt_roam_node;
1532 bool ret = false;
1533
1534 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1535 /* The new tt_req will be issued only if I'm not waiting for a
1536 * reply from the same orig_node yet */
1537 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1538 if (!compare_eth(tt_roam_node->addr, client))
1539 continue;
1540
1541 if (is_out_of_time(tt_roam_node->first_time,
1542 ROAMING_MAX_TIME * 1000))
1543 continue;
1544
1545 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1546 /* Sorry, you roamed too many times! */
1547 goto unlock;
1548 ret = true;
1549 break;
1550 }
1551
1552 if (!ret) {
1553 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1554 if (!tt_roam_node)
1555 goto unlock;
1556
1557 tt_roam_node->first_time = jiffies;
1558 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1559 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1560
1561 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1562 ret = true;
1563 }
1564
1565 unlock:
1566 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1567 return ret;
1568 }
1569
1570 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1571 struct orig_node *orig_node)
1572 {
1573 struct neigh_node *neigh_node = NULL;
1574 struct sk_buff *skb = NULL;
1575 struct roam_adv_packet *roam_adv_packet;
1576 int ret = 1;
1577 struct hard_iface *primary_if;
1578
1579 /* before going on we have to check whether the client has
1580 * already roamed to us too many times */
1581 if (!tt_check_roam_count(bat_priv, client))
1582 goto out;
1583
1584 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1585 if (!skb)
1586 goto out;
1587
1588 skb_reserve(skb, ETH_HLEN);
1589
1590 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1591 sizeof(struct roam_adv_packet));
1592
1593 roam_adv_packet->packet_type = BAT_ROAM_ADV;
1594 roam_adv_packet->version = COMPAT_VERSION;
1595 roam_adv_packet->ttl = TTL;
1596 primary_if = primary_if_get_selected(bat_priv);
1597 if (!primary_if)
1598 goto out;
1599 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1600 hardif_free_ref(primary_if);
1601 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1602 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1603
1604 neigh_node = orig_node_get_router(orig_node);
1605 if (!neigh_node)
1606 goto out;
1607
1608 bat_dbg(DBG_TT, bat_priv,
1609 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1610 orig_node->orig, client, neigh_node->addr);
1611
1612 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1613 ret = 0;
1614
1615 out:
1616 if (neigh_node)
1617 neigh_node_free_ref(neigh_node);
1618 if (ret)
1619 kfree_skb(skb);
1620 return;
1621 }
1622
1623 static void tt_purge(struct work_struct *work)
1624 {
1625 struct delayed_work *delayed_work =
1626 container_of(work, struct delayed_work, work);
1627 struct bat_priv *bat_priv =
1628 container_of(delayed_work, struct bat_priv, tt_work);
1629
1630 tt_local_purge(bat_priv);
1631 tt_global_roam_purge(bat_priv);
1632 tt_req_purge(bat_priv);
1633 tt_roam_purge(bat_priv);
1634
1635 tt_start_timer(bat_priv);
1636 }
1637
1638 void tt_free(struct bat_priv *bat_priv)
1639 {
1640 cancel_delayed_work_sync(&bat_priv->tt_work);
1641
1642 tt_local_table_free(bat_priv);
1643 tt_global_table_free(bat_priv);
1644 tt_req_list_free(bat_priv);
1645 tt_changes_list_free(bat_priv);
1646 tt_roam_list_free(bat_priv);
1647
1648 kfree(bat_priv->tt_buff);
1649 }
1650
1651 /* This function will reset the specified flags from all the entries in
1652 * the given hash table and will increment num_local_tt for each involved
1653 * entry */
1654 static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
1655 {
1656 int i;
1657 struct hashtable_t *hash = bat_priv->tt_local_hash;
1658 struct hlist_head *head;
1659 struct hlist_node *node;
1660 struct tt_local_entry *tt_local_entry;
1661
1662 if (!hash)
1663 return;
1664
1665 for (i = 0; i < hash->size; i++) {
1666 head = &hash->table[i];
1667
1668 rcu_read_lock();
1669 hlist_for_each_entry_rcu(tt_local_entry, node,
1670 head, hash_entry) {
1671 tt_local_entry->flags &= ~flags;
1672 atomic_inc(&bat_priv->num_local_tt);
1673 }
1674 rcu_read_unlock();
1675 }
1676
1677 }
1678
1679 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1680 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1681 {
1682 struct hashtable_t *hash = bat_priv->tt_local_hash;
1683 struct tt_local_entry *tt_local_entry;
1684 struct hlist_node *node, *node_tmp;
1685 struct hlist_head *head;
1686 spinlock_t *list_lock; /* protects write access to the hash lists */
1687 int i;
1688
1689 if (!hash)
1690 return;
1691
1692 for (i = 0; i < hash->size; i++) {
1693 head = &hash->table[i];
1694 list_lock = &hash->list_locks[i];
1695
1696 spin_lock_bh(list_lock);
1697 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
1698 head, hash_entry) {
1699 if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
1700 continue;
1701
1702 bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1703 "(%pM): pending\n", tt_local_entry->addr);
1704
1705 atomic_dec(&bat_priv->num_local_tt);
1706 hlist_del_rcu(node);
1707 tt_local_entry_free_ref(tt_local_entry);
1708 }
1709 spin_unlock_bh(list_lock);
1710 }
1711
1712 }
1713
1714 void tt_commit_changes(struct bat_priv *bat_priv)
1715 {
1716 tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
1717 tt_local_purge_pending_clients(bat_priv);
1718
1719 /* Increment the TTVN only once per OGM interval */
1720 atomic_inc(&bat_priv->ttvn);
1721 bat_priv->tt_poss_change = false;
1722 }
Linux Btrfs Development