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The discovered bit in PGCCSR register indicates if the device has been
[linux-2.6/next.git] / net / batman-adv / translation-table.c
blobcc53f78e448ce41de460d09e0782d8250db8ef13
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 int ifindex)
188 {
189 struct bat_priv *bat_priv = netdev_priv(soft_iface);
190 struct tt_local_entry *tt_local_entry = NULL;
191 struct tt_global_entry *tt_global_entry = NULL;
192
193 tt_local_entry = tt_local_hash_find(bat_priv, addr);
194
195 if (tt_local_entry) {
196 tt_local_entry->last_seen = jiffies;
197 goto out;
198 }
199
200 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
201 if (!tt_local_entry)
202 goto out;
203
204 bat_dbg(DBG_TT, bat_priv,
205 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
206 (uint8_t)atomic_read(&bat_priv->ttvn));
207
208 memcpy(tt_local_entry->addr, addr, ETH_ALEN);
209 tt_local_entry->last_seen = jiffies;
210 tt_local_entry->flags = NO_FLAGS;
211 if (is_wifi_iface(ifindex))
212 tt_local_entry->flags |= TT_CLIENT_WIFI;
213 atomic_set(&tt_local_entry->refcount, 2);
214
215 /* the batman interface mac address should never be purged */
216 if (compare_eth(addr, soft_iface->dev_addr))
217 tt_local_entry->flags |= TT_CLIENT_NOPURGE;
218
219 tt_local_event(bat_priv, addr, tt_local_entry->flags);
220
221 /* The local entry has to be marked as NEW to avoid to send it in
222 * a full table response going out before the next ttvn increment
223 * (consistency check) */
224 tt_local_entry->flags |= TT_CLIENT_NEW;
225
226 hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
227 tt_local_entry, &tt_local_entry->hash_entry);
228
229 /* remove address from global hash if present */
230 tt_global_entry = tt_global_hash_find(bat_priv, addr);
231
232 /* Check whether it is a roaming! */
233 if (tt_global_entry) {
234 /* This node is probably going to update its tt table */
235 tt_global_entry->orig_node->tt_poss_change = true;
236 /* The global entry has to be marked as PENDING and has to be
237 * kept for consistency purpose */
238 tt_global_entry->flags |= TT_CLIENT_PENDING;
239 send_roam_adv(bat_priv, tt_global_entry->addr,
240 tt_global_entry->orig_node);
241 }
242 out:
243 if (tt_local_entry)
244 tt_local_entry_free_ref(tt_local_entry);
245 if (tt_global_entry)
246 tt_global_entry_free_ref(tt_global_entry);
247 }
248
249 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
250 unsigned char *buff, int buff_len)
251 {
252 int count = 0, tot_changes = 0;
253 struct tt_change_node *entry, *safe;
254
255 if (buff_len > 0)
256 tot_changes = buff_len / tt_len(1);
257
258 spin_lock_bh(&bat_priv->tt_changes_list_lock);
259 atomic_set(&bat_priv->tt_local_changes, 0);
260
261 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
262 list) {
263 if (count < tot_changes) {
264 memcpy(buff + tt_len(count),
265 &entry->change, sizeof(struct tt_change));
266 count++;
267 }
268 list_del(&entry->list);
269 kfree(entry);
270 }
271 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
272
273 /* Keep the buffer for possible tt_request */
274 spin_lock_bh(&bat_priv->tt_buff_lock);
275 kfree(bat_priv->tt_buff);
276 bat_priv->tt_buff_len = 0;
277 bat_priv->tt_buff = NULL;
278 /* We check whether this new OGM has no changes due to size
279 * problems */
280 if (buff_len > 0) {
281 /**
282 * if kmalloc() fails we will reply with the full table
283 * instead of providing the diff
284 */
285 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
286 if (bat_priv->tt_buff) {
287 memcpy(bat_priv->tt_buff, buff, buff_len);
288 bat_priv->tt_buff_len = buff_len;
289 }
290 }
291 spin_unlock_bh(&bat_priv->tt_buff_lock);
292
293 return tot_changes;
294 }
295
296 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
297 {
298 struct net_device *net_dev = (struct net_device *)seq->private;
299 struct bat_priv *bat_priv = netdev_priv(net_dev);
300 struct hashtable_t *hash = bat_priv->tt_local_hash;
301 struct tt_local_entry *tt_local_entry;
302 struct hard_iface *primary_if;
303 struct hlist_node *node;
304 struct hlist_head *head;
305 size_t buf_size, pos;
306 char *buff;
307 int i, ret = 0;
308
309 primary_if = primary_if_get_selected(bat_priv);
310 if (!primary_if) {
311 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
312 "please specify interfaces to enable it\n",
313 net_dev->name);
314 goto out;
315 }
316
317 if (primary_if->if_status != IF_ACTIVE) {
318 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
319 "primary interface not active\n",
320 net_dev->name);
321 goto out;
322 }
323
324 seq_printf(seq, "Locally retrieved addresses (from %s) "
325 "announced via TT (TTVN: %u):\n",
326 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
327
328 buf_size = 1;
329 /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
330 for (i = 0; i < hash->size; i++) {
331 head = &hash->table[i];
332
333 rcu_read_lock();
334 __hlist_for_each_rcu(node, head)
335 buf_size += 29;
336 rcu_read_unlock();
337 }
338
339 buff = kmalloc(buf_size, GFP_ATOMIC);
340 if (!buff) {
341 ret = -ENOMEM;
342 goto out;
343 }
344
345 buff[0] = '\0';
346 pos = 0;
347
348 for (i = 0; i < hash->size; i++) {
349 head = &hash->table[i];
350
351 rcu_read_lock();
352 hlist_for_each_entry_rcu(tt_local_entry, node,
353 head, hash_entry) {
354 pos += snprintf(buff + pos, 30, " * %pM "
355 "[%c%c%c%c%c]\n",
356 tt_local_entry->addr,
357 (tt_local_entry->flags &
358 TT_CLIENT_ROAM ? 'R' : '.'),
359 (tt_local_entry->flags &
360 TT_CLIENT_NOPURGE ? 'P' : '.'),
361 (tt_local_entry->flags &
362 TT_CLIENT_NEW ? 'N' : '.'),
363 (tt_local_entry->flags &
364 TT_CLIENT_PENDING ? 'X' : '.'),
365 (tt_local_entry->flags &
366 TT_CLIENT_WIFI ? 'W' : '.'));
367 }
368 rcu_read_unlock();
369 }
370
371 seq_printf(seq, "%s", buff);
372 kfree(buff);
373 out:
374 if (primary_if)
375 hardif_free_ref(primary_if);
376 return ret;
377 }
378
379 static void tt_local_set_pending(struct bat_priv *bat_priv,
380 struct tt_local_entry *tt_local_entry,
381 uint16_t flags)
382 {
383 tt_local_event(bat_priv, tt_local_entry->addr,
384 tt_local_entry->flags | flags);
385
386 /* The local client has to be marked as "pending to be removed" but has
387 * to be kept in the table in order to send it in a full table
388 * response issued before the net ttvn increment (consistency check) */
389 tt_local_entry->flags |= TT_CLIENT_PENDING;
390 }
391
392 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
393 const char *message, bool roaming)
394 {
395 struct tt_local_entry *tt_local_entry = NULL;
396
397 tt_local_entry = tt_local_hash_find(bat_priv, addr);
398 if (!tt_local_entry)
399 goto out;
400
401 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
402 (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
403
404 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
405 "%s\n", tt_local_entry->addr, message);
406 out:
407 if (tt_local_entry)
408 tt_local_entry_free_ref(tt_local_entry);
409 }
410
411 static void tt_local_purge(struct bat_priv *bat_priv)
412 {
413 struct hashtable_t *hash = bat_priv->tt_local_hash;
414 struct tt_local_entry *tt_local_entry;
415 struct hlist_node *node, *node_tmp;
416 struct hlist_head *head;
417 spinlock_t *list_lock; /* protects write access to the hash lists */
418 int i;
419
420 for (i = 0; i < hash->size; i++) {
421 head = &hash->table[i];
422 list_lock = &hash->list_locks[i];
423
424 spin_lock_bh(list_lock);
425 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
426 head, hash_entry) {
427 if (tt_local_entry->flags & TT_CLIENT_NOPURGE)
428 continue;
429
430 /* entry already marked for deletion */
431 if (tt_local_entry->flags & TT_CLIENT_PENDING)
432 continue;
433
434 if (!is_out_of_time(tt_local_entry->last_seen,
435 TT_LOCAL_TIMEOUT * 1000))
436 continue;
437
438 tt_local_set_pending(bat_priv, tt_local_entry,
439 TT_CLIENT_DEL);
440 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
441 "pending to be removed: timed out\n",
442 tt_local_entry->addr);
443 }
444 spin_unlock_bh(list_lock);
445 }
446
447 }
448
449 static void tt_local_table_free(struct bat_priv *bat_priv)
450 {
451 struct hashtable_t *hash;
452 spinlock_t *list_lock; /* protects write access to the hash lists */
453 struct tt_local_entry *tt_local_entry;
454 struct hlist_node *node, *node_tmp;
455 struct hlist_head *head;
456 int i;
457
458 if (!bat_priv->tt_local_hash)
459 return;
460
461 hash = bat_priv->tt_local_hash;
462
463 for (i = 0; i < hash->size; i++) {
464 head = &hash->table[i];
465 list_lock = &hash->list_locks[i];
466
467 spin_lock_bh(list_lock);
468 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
469 head, hash_entry) {
470 hlist_del_rcu(node);
471 tt_local_entry_free_ref(tt_local_entry);
472 }
473 spin_unlock_bh(list_lock);
474 }
475
476 hash_destroy(hash);
477
478 bat_priv->tt_local_hash = NULL;
479 }
480
481 static int tt_global_init(struct bat_priv *bat_priv)
482 {
483 if (bat_priv->tt_global_hash)
484 return 1;
485
486 bat_priv->tt_global_hash = hash_new(1024);
487
488 if (!bat_priv->tt_global_hash)
489 return 0;
490
491 return 1;
492 }
493
494 static void tt_changes_list_free(struct bat_priv *bat_priv)
495 {
496 struct tt_change_node *entry, *safe;
497
498 spin_lock_bh(&bat_priv->tt_changes_list_lock);
499
500 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
501 list) {
502 list_del(&entry->list);
503 kfree(entry);
504 }
505
506 atomic_set(&bat_priv->tt_local_changes, 0);
507 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
508 }
509
510 /* caller must hold orig_node refcount */
511 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
512 const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
513 bool wifi)
514 {
515 struct tt_global_entry *tt_global_entry;
516 struct orig_node *orig_node_tmp;
517 int ret = 0;
518
519 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
520
521 if (!tt_global_entry) {
522 tt_global_entry =
523 kmalloc(sizeof(*tt_global_entry),
524 GFP_ATOMIC);
525 if (!tt_global_entry)
526 goto out;
527
528 memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
529 /* Assign the new orig_node */
530 atomic_inc(&orig_node->refcount);
531 tt_global_entry->orig_node = orig_node;
532 tt_global_entry->ttvn = ttvn;
533 tt_global_entry->flags = NO_FLAGS;
534 tt_global_entry->roam_at = 0;
535 atomic_set(&tt_global_entry->refcount, 2);
536
537 hash_add(bat_priv->tt_global_hash, compare_gtt,
538 choose_orig, tt_global_entry,
539 &tt_global_entry->hash_entry);
540 atomic_inc(&orig_node->tt_size);
541 } else {
542 if (tt_global_entry->orig_node != orig_node) {
543 atomic_dec(&tt_global_entry->orig_node->tt_size);
544 orig_node_tmp = tt_global_entry->orig_node;
545 atomic_inc(&orig_node->refcount);
546 tt_global_entry->orig_node = orig_node;
547 orig_node_free_ref(orig_node_tmp);
548 atomic_inc(&orig_node->tt_size);
549 }
550 tt_global_entry->ttvn = ttvn;
551 tt_global_entry->flags = NO_FLAGS;
552 tt_global_entry->roam_at = 0;
553 }
554
555 if (wifi)
556 tt_global_entry->flags |= TT_CLIENT_WIFI;
557
558 bat_dbg(DBG_TT, bat_priv,
559 "Creating new global tt entry: %pM (via %pM)\n",
560 tt_global_entry->addr, orig_node->orig);
561
562 /* remove address from local hash if present */
563 tt_local_remove(bat_priv, tt_global_entry->addr,
564 "global tt received", roaming);
565 ret = 1;
566 out:
567 if (tt_global_entry)
568 tt_global_entry_free_ref(tt_global_entry);
569 return ret;
570 }
571
572 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
573 {
574 struct net_device *net_dev = (struct net_device *)seq->private;
575 struct bat_priv *bat_priv = netdev_priv(net_dev);
576 struct hashtable_t *hash = bat_priv->tt_global_hash;
577 struct tt_global_entry *tt_global_entry;
578 struct hard_iface *primary_if;
579 struct hlist_node *node;
580 struct hlist_head *head;
581 size_t buf_size, pos;
582 char *buff;
583 int i, ret = 0;
584
585 primary_if = primary_if_get_selected(bat_priv);
586 if (!primary_if) {
587 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
588 "specify interfaces to enable it\n",
589 net_dev->name);
590 goto out;
591 }
592
593 if (primary_if->if_status != IF_ACTIVE) {
594 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
595 "primary interface not active\n",
596 net_dev->name);
597 goto out;
598 }
599
600 seq_printf(seq,
601 "Globally announced TT entries received via the mesh %s\n",
602 net_dev->name);
603 seq_printf(seq, " %-13s %s %-15s %s %s\n",
604 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
605
606 buf_size = 1;
607 /* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
608 * xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
609 for (i = 0; i < hash->size; i++) {
610 head = &hash->table[i];
611
612 rcu_read_lock();
613 __hlist_for_each_rcu(node, head)
614 buf_size += 67;
615 rcu_read_unlock();
616 }
617
618 buff = kmalloc(buf_size, GFP_ATOMIC);
619 if (!buff) {
620 ret = -ENOMEM;
621 goto out;
622 }
623
624 buff[0] = '\0';
625 pos = 0;
626
627 for (i = 0; i < hash->size; i++) {
628 head = &hash->table[i];
629
630 rcu_read_lock();
631 hlist_for_each_entry_rcu(tt_global_entry, node,
632 head, hash_entry) {
633 pos += snprintf(buff + pos, 69,
634 " * %pM (%3u) via %pM (%3u) "
635 "[%c%c%c]\n", tt_global_entry->addr,
636 tt_global_entry->ttvn,
637 tt_global_entry->orig_node->orig,
638 (uint8_t) atomic_read(
639 &tt_global_entry->orig_node->
640 last_ttvn),
641 (tt_global_entry->flags &
642 TT_CLIENT_ROAM ? 'R' : '.'),
643 (tt_global_entry->flags &
644 TT_CLIENT_PENDING ? 'X' : '.'),
645 (tt_global_entry->flags &
646 TT_CLIENT_WIFI ? 'W' : '.'));
647 }
648 rcu_read_unlock();
649 }
650
651 seq_printf(seq, "%s", buff);
652 kfree(buff);
653 out:
654 if (primary_if)
655 hardif_free_ref(primary_if);
656 return ret;
657 }
658
659 static void _tt_global_del(struct bat_priv *bat_priv,
660 struct tt_global_entry *tt_global_entry,
661 const char *message)
662 {
663 if (!tt_global_entry)
664 goto out;
665
666 bat_dbg(DBG_TT, bat_priv,
667 "Deleting global tt entry %pM (via %pM): %s\n",
668 tt_global_entry->addr, tt_global_entry->orig_node->orig,
669 message);
670
671 atomic_dec(&tt_global_entry->orig_node->tt_size);
672
673 hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
674 tt_global_entry->addr);
675 out:
676 if (tt_global_entry)
677 tt_global_entry_free_ref(tt_global_entry);
678 }
679
680 void tt_global_del(struct bat_priv *bat_priv,
681 struct orig_node *orig_node, const unsigned char *addr,
682 const char *message, bool roaming)
683 {
684 struct tt_global_entry *tt_global_entry = NULL;
685
686 tt_global_entry = tt_global_hash_find(bat_priv, addr);
687 if (!tt_global_entry)
688 goto out;
689
690 if (tt_global_entry->orig_node == orig_node) {
691 if (roaming) {
692 tt_global_entry->flags |= TT_CLIENT_ROAM;
693 tt_global_entry->roam_at = jiffies;
694 goto out;
695 }
696 _tt_global_del(bat_priv, tt_global_entry, message);
697 }
698 out:
699 if (tt_global_entry)
700 tt_global_entry_free_ref(tt_global_entry);
701 }
702
703 void tt_global_del_orig(struct bat_priv *bat_priv,
704 struct orig_node *orig_node, const char *message)
705 {
706 struct tt_global_entry *tt_global_entry;
707 int i;
708 struct hashtable_t *hash = bat_priv->tt_global_hash;
709 struct hlist_node *node, *safe;
710 struct hlist_head *head;
711 spinlock_t *list_lock; /* protects write access to the hash lists */
712
713 for (i = 0; i < hash->size; i++) {
714 head = &hash->table[i];
715 list_lock = &hash->list_locks[i];
716
717 spin_lock_bh(list_lock);
718 hlist_for_each_entry_safe(tt_global_entry, node, safe,
719 head, hash_entry) {
720 if (tt_global_entry->orig_node == orig_node) {
721 bat_dbg(DBG_TT, bat_priv,
722 "Deleting global tt entry %pM "
723 "(via %pM): originator time out\n",
724 tt_global_entry->addr,
725 tt_global_entry->orig_node->orig);
726 hlist_del_rcu(node);
727 tt_global_entry_free_ref(tt_global_entry);
728 }
729 }
730 spin_unlock_bh(list_lock);
731 }
732 atomic_set(&orig_node->tt_size, 0);
733 }
734
735 static void tt_global_roam_purge(struct bat_priv *bat_priv)
736 {
737 struct hashtable_t *hash = bat_priv->tt_global_hash;
738 struct tt_global_entry *tt_global_entry;
739 struct hlist_node *node, *node_tmp;
740 struct hlist_head *head;
741 spinlock_t *list_lock; /* protects write access to the hash lists */
742 int i;
743
744 for (i = 0; i < hash->size; i++) {
745 head = &hash->table[i];
746 list_lock = &hash->list_locks[i];
747
748 spin_lock_bh(list_lock);
749 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
750 head, hash_entry) {
751 if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
752 continue;
753 if (!is_out_of_time(tt_global_entry->roam_at,
754 TT_CLIENT_ROAM_TIMEOUT * 1000))
755 continue;
756
757 bat_dbg(DBG_TT, bat_priv, "Deleting global "
758 "tt entry (%pM): Roaming timeout\n",
759 tt_global_entry->addr);
760 atomic_dec(&tt_global_entry->orig_node->tt_size);
761 hlist_del_rcu(node);
762 tt_global_entry_free_ref(tt_global_entry);
763 }
764 spin_unlock_bh(list_lock);
765 }
766
767 }
768
769 static void tt_global_table_free(struct bat_priv *bat_priv)
770 {
771 struct hashtable_t *hash;
772 spinlock_t *list_lock; /* protects write access to the hash lists */
773 struct tt_global_entry *tt_global_entry;
774 struct hlist_node *node, *node_tmp;
775 struct hlist_head *head;
776 int i;
777
778 if (!bat_priv->tt_global_hash)
779 return;
780
781 hash = bat_priv->tt_global_hash;
782
783 for (i = 0; i < hash->size; i++) {
784 head = &hash->table[i];
785 list_lock = &hash->list_locks[i];
786
787 spin_lock_bh(list_lock);
788 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
789 head, hash_entry) {
790 hlist_del_rcu(node);
791 tt_global_entry_free_ref(tt_global_entry);
792 }
793 spin_unlock_bh(list_lock);
794 }
795
796 hash_destroy(hash);
797
798 bat_priv->tt_global_hash = NULL;
799 }
800
801 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
802 struct tt_global_entry *tt_global_entry)
803 {
804 bool ret = false;
805
806 if (tt_local_entry->flags & TT_CLIENT_WIFI &&
807 tt_global_entry->flags & TT_CLIENT_WIFI)
808 ret = true;
809
810 return ret;
811 }
812
813 struct orig_node *transtable_search(struct bat_priv *bat_priv,
814 const uint8_t *src, const uint8_t *addr)
815 {
816 struct tt_local_entry *tt_local_entry = NULL;
817 struct tt_global_entry *tt_global_entry = NULL;
818 struct orig_node *orig_node = NULL;
819
820 if (src && atomic_read(&bat_priv->ap_isolation)) {
821 tt_local_entry = tt_local_hash_find(bat_priv, src);
822 if (!tt_local_entry)
823 goto out;
824 }
825
826 tt_global_entry = tt_global_hash_find(bat_priv, addr);
827 if (!tt_global_entry)
828 goto out;
829
830 /* check whether the clients should not communicate due to AP
831 * isolation */
832 if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
833 goto out;
834
835 if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
836 goto out;
837
838 /* A global client marked as PENDING has already moved from that
839 * originator */
840 if (tt_global_entry->flags & TT_CLIENT_PENDING)
841 goto out;
842
843 orig_node = tt_global_entry->orig_node;
844
845 out:
846 if (tt_global_entry)
847 tt_global_entry_free_ref(tt_global_entry);
848 if (tt_local_entry)
849 tt_local_entry_free_ref(tt_local_entry);
850
851 return orig_node;
852 }
853
854 /* Calculates the checksum of the local table of a given orig_node */
855 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
856 {
857 uint16_t total = 0, total_one;
858 struct hashtable_t *hash = bat_priv->tt_global_hash;
859 struct tt_global_entry *tt_global_entry;
860 struct hlist_node *node;
861 struct hlist_head *head;
862 int i, j;
863
864 for (i = 0; i < hash->size; i++) {
865 head = &hash->table[i];
866
867 rcu_read_lock();
868 hlist_for_each_entry_rcu(tt_global_entry, node,
869 head, hash_entry) {
870 if (compare_eth(tt_global_entry->orig_node,
871 orig_node)) {
872 /* Roaming clients are in the global table for
873 * consistency only. They don't have to be
874 * taken into account while computing the
875 * global crc */
876 if (tt_global_entry->flags & TT_CLIENT_ROAM)
877 continue;
878 total_one = 0;
879 for (j = 0; j < ETH_ALEN; j++)
880 total_one = crc16_byte(total_one,
881 tt_global_entry->addr[j]);
882 total ^= total_one;
883 }
884 }
885 rcu_read_unlock();
886 }
887
888 return total;
889 }
890
891 /* Calculates the checksum of the local table */
892 uint16_t tt_local_crc(struct bat_priv *bat_priv)
893 {
894 uint16_t total = 0, total_one;
895 struct hashtable_t *hash = bat_priv->tt_local_hash;
896 struct tt_local_entry *tt_local_entry;
897 struct hlist_node *node;
898 struct hlist_head *head;
899 int i, j;
900
901 for (i = 0; i < hash->size; i++) {
902 head = &hash->table[i];
903
904 rcu_read_lock();
905 hlist_for_each_entry_rcu(tt_local_entry, node,
906 head, hash_entry) {
907 /* not yet committed clients have not to be taken into
908 * account while computing the CRC */
909 if (tt_local_entry->flags & TT_CLIENT_NEW)
910 continue;
911 total_one = 0;
912 for (j = 0; j < ETH_ALEN; j++)
913 total_one = crc16_byte(total_one,
914 tt_local_entry->addr[j]);
915 total ^= total_one;
916 }
917 rcu_read_unlock();
918 }
919
920 return total;
921 }
922
923 static void tt_req_list_free(struct bat_priv *bat_priv)
924 {
925 struct tt_req_node *node, *safe;
926
927 spin_lock_bh(&bat_priv->tt_req_list_lock);
928
929 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
930 list_del(&node->list);
931 kfree(node);
932 }
933
934 spin_unlock_bh(&bat_priv->tt_req_list_lock);
935 }
936
937 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
938 const unsigned char *tt_buff, uint8_t tt_num_changes)
939 {
940 uint16_t tt_buff_len = tt_len(tt_num_changes);
941
942 /* Replace the old buffer only if I received something in the
943 * last OGM (the OGM could carry no changes) */
944 spin_lock_bh(&orig_node->tt_buff_lock);
945 if (tt_buff_len > 0) {
946 kfree(orig_node->tt_buff);
947 orig_node->tt_buff_len = 0;
948 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
949 if (orig_node->tt_buff) {
950 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
951 orig_node->tt_buff_len = tt_buff_len;
952 }
953 }
954 spin_unlock_bh(&orig_node->tt_buff_lock);
955 }
956
957 static void tt_req_purge(struct bat_priv *bat_priv)
958 {
959 struct tt_req_node *node, *safe;
960
961 spin_lock_bh(&bat_priv->tt_req_list_lock);
962 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
963 if (is_out_of_time(node->issued_at,
964 TT_REQUEST_TIMEOUT * 1000)) {
965 list_del(&node->list);
966 kfree(node);
967 }
968 }
969 spin_unlock_bh(&bat_priv->tt_req_list_lock);
970 }
971
972 /* returns the pointer to the new tt_req_node struct if no request
973 * has already been issued for this orig_node, NULL otherwise */
974 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
975 struct orig_node *orig_node)
976 {
977 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
978
979 spin_lock_bh(&bat_priv->tt_req_list_lock);
980 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
981 if (compare_eth(tt_req_node_tmp, orig_node) &&
982 !is_out_of_time(tt_req_node_tmp->issued_at,
983 TT_REQUEST_TIMEOUT * 1000))
984 goto unlock;
985 }
986
987 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
988 if (!tt_req_node)
989 goto unlock;
990
991 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
992 tt_req_node->issued_at = jiffies;
993
994 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
995 unlock:
996 spin_unlock_bh(&bat_priv->tt_req_list_lock);
997 return tt_req_node;
998 }
999
1000 /* data_ptr is useless here, but has to be kept to respect the prototype */
1001 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1002 {
1003 const struct tt_local_entry *tt_local_entry = entry_ptr;
1004
1005 if (tt_local_entry->flags & TT_CLIENT_NEW)
1006 return 0;
1007 return 1;
1008 }
1009
1010 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1011 {
1012 const struct tt_global_entry *tt_global_entry = entry_ptr;
1013 const struct orig_node *orig_node = data_ptr;
1014
1015 if (tt_global_entry->flags & TT_CLIENT_ROAM)
1016 return 0;
1017
1018 return (tt_global_entry->orig_node == orig_node);
1019 }
1020
1021 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1022 struct hashtable_t *hash,
1023 struct hard_iface *primary_if,
1024 int (*valid_cb)(const void *,
1025 const void *),
1026 void *cb_data)
1027 {
1028 struct tt_local_entry *tt_local_entry;
1029 struct tt_query_packet *tt_response;
1030 struct tt_change *tt_change;
1031 struct hlist_node *node;
1032 struct hlist_head *head;
1033 struct sk_buff *skb = NULL;
1034 uint16_t tt_tot, tt_count;
1035 ssize_t tt_query_size = sizeof(struct tt_query_packet);
1036 int i;
1037
1038 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1039 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1040 tt_len -= tt_len % sizeof(struct tt_change);
1041 }
1042 tt_tot = tt_len / sizeof(struct tt_change);
1043
1044 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1045 if (!skb)
1046 goto out;
1047
1048 skb_reserve(skb, ETH_HLEN);
1049 tt_response = (struct tt_query_packet *)skb_put(skb,
1050 tt_query_size + tt_len);
1051 tt_response->ttvn = ttvn;
1052 tt_response->tt_data = htons(tt_tot);
1053
1054 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1055 tt_count = 0;
1056
1057 rcu_read_lock();
1058 for (i = 0; i < hash->size; i++) {
1059 head = &hash->table[i];
1060
1061 hlist_for_each_entry_rcu(tt_local_entry, node,
1062 head, hash_entry) {
1063 if (tt_count == tt_tot)
1064 break;
1065
1066 if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
1067 continue;
1068
1069 memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
1070 tt_change->flags = NO_FLAGS;
1071
1072 tt_count++;
1073 tt_change++;
1074 }
1075 }
1076 rcu_read_unlock();
1077
1078 out:
1079 return skb;
1080 }
1081
1082 static int send_tt_request(struct bat_priv *bat_priv,
1083 struct orig_node *dst_orig_node,
1084 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1085 {
1086 struct sk_buff *skb = NULL;
1087 struct tt_query_packet *tt_request;
1088 struct neigh_node *neigh_node = NULL;
1089 struct hard_iface *primary_if;
1090 struct tt_req_node *tt_req_node = NULL;
1091 int ret = 1;
1092
1093 primary_if = primary_if_get_selected(bat_priv);
1094 if (!primary_if)
1095 goto out;
1096
1097 /* The new tt_req will be issued only if I'm not waiting for a
1098 * reply from the same orig_node yet */
1099 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1100 if (!tt_req_node)
1101 goto out;
1102
1103 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1104 if (!skb)
1105 goto out;
1106
1107 skb_reserve(skb, ETH_HLEN);
1108
1109 tt_request = (struct tt_query_packet *)skb_put(skb,
1110 sizeof(struct tt_query_packet));
1111
1112 tt_request->packet_type = BAT_TT_QUERY;
1113 tt_request->version = COMPAT_VERSION;
1114 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1115 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1116 tt_request->ttl = TTL;
1117 tt_request->ttvn = ttvn;
1118 tt_request->tt_data = tt_crc;
1119 tt_request->flags = TT_REQUEST;
1120
1121 if (full_table)
1122 tt_request->flags |= TT_FULL_TABLE;
1123
1124 neigh_node = orig_node_get_router(dst_orig_node);
1125 if (!neigh_node)
1126 goto out;
1127
1128 bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1129 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1130 (full_table ? 'F' : '.'));
1131
1132 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1133 ret = 0;
1134
1135 out:
1136 if (neigh_node)
1137 neigh_node_free_ref(neigh_node);
1138 if (primary_if)
1139 hardif_free_ref(primary_if);
1140 if (ret)
1141 kfree_skb(skb);
1142 if (ret && tt_req_node) {
1143 spin_lock_bh(&bat_priv->tt_req_list_lock);
1144 list_del(&tt_req_node->list);
1145 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1146 kfree(tt_req_node);
1147 }
1148 return ret;
1149 }
1150
1151 static bool send_other_tt_response(struct bat_priv *bat_priv,
1152 struct tt_query_packet *tt_request)
1153 {
1154 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1155 struct neigh_node *neigh_node = NULL;
1156 struct hard_iface *primary_if = NULL;
1157 uint8_t orig_ttvn, req_ttvn, ttvn;
1158 int ret = false;
1159 unsigned char *tt_buff;
1160 bool full_table;
1161 uint16_t tt_len, tt_tot;
1162 struct sk_buff *skb = NULL;
1163 struct tt_query_packet *tt_response;
1164
1165 bat_dbg(DBG_TT, bat_priv,
1166 "Received TT_REQUEST from %pM for "
1167 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1168 tt_request->ttvn, tt_request->dst,
1169 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1170
1171 /* Let's get the orig node of the REAL destination */
1172 req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
1173 if (!req_dst_orig_node)
1174 goto out;
1175
1176 res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
1177 if (!res_dst_orig_node)
1178 goto out;
1179
1180 neigh_node = orig_node_get_router(res_dst_orig_node);
1181 if (!neigh_node)
1182 goto out;
1183
1184 primary_if = primary_if_get_selected(bat_priv);
1185 if (!primary_if)
1186 goto out;
1187
1188 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1189 req_ttvn = tt_request->ttvn;
1190
1191 /* I don't have the requested data */
1192 if (orig_ttvn != req_ttvn ||
1193 tt_request->tt_data != req_dst_orig_node->tt_crc)
1194 goto out;
1195
1196 /* If the full table has been explicitly requested */
1197 if (tt_request->flags & TT_FULL_TABLE ||
1198 !req_dst_orig_node->tt_buff)
1199 full_table = true;
1200 else
1201 full_table = false;
1202
1203 /* In this version, fragmentation is not implemented, then
1204 * I'll send only one packet with as much TT entries as I can */
1205 if (!full_table) {
1206 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1207 tt_len = req_dst_orig_node->tt_buff_len;
1208 tt_tot = tt_len / sizeof(struct tt_change);
1209
1210 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1211 tt_len + ETH_HLEN);
1212 if (!skb)
1213 goto unlock;
1214
1215 skb_reserve(skb, ETH_HLEN);
1216 tt_response = (struct tt_query_packet *)skb_put(skb,
1217 sizeof(struct tt_query_packet) + tt_len);
1218 tt_response->ttvn = req_ttvn;
1219 tt_response->tt_data = htons(tt_tot);
1220
1221 tt_buff = skb->data + sizeof(struct tt_query_packet);
1222 /* Copy the last orig_node's OGM buffer */
1223 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1224 req_dst_orig_node->tt_buff_len);
1225
1226 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1227 } else {
1228 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1229 sizeof(struct tt_change);
1230 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1231
1232 skb = tt_response_fill_table(tt_len, ttvn,
1233 bat_priv->tt_global_hash,
1234 primary_if, tt_global_valid_entry,
1235 req_dst_orig_node);
1236 if (!skb)
1237 goto out;
1238
1239 tt_response = (struct tt_query_packet *)skb->data;
1240 }
1241
1242 tt_response->packet_type = BAT_TT_QUERY;
1243 tt_response->version = COMPAT_VERSION;
1244 tt_response->ttl = TTL;
1245 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1246 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1247 tt_response->flags = TT_RESPONSE;
1248
1249 if (full_table)
1250 tt_response->flags |= TT_FULL_TABLE;
1251
1252 bat_dbg(DBG_TT, bat_priv,
1253 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1254 res_dst_orig_node->orig, neigh_node->addr,
1255 req_dst_orig_node->orig, req_ttvn);
1256
1257 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1258 ret = true;
1259 goto out;
1260
1261 unlock:
1262 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1263
1264 out:
1265 if (res_dst_orig_node)
1266 orig_node_free_ref(res_dst_orig_node);
1267 if (req_dst_orig_node)
1268 orig_node_free_ref(req_dst_orig_node);
1269 if (neigh_node)
1270 neigh_node_free_ref(neigh_node);
1271 if (primary_if)
1272 hardif_free_ref(primary_if);
1273 if (!ret)
1274 kfree_skb(skb);
1275 return ret;
1276
1277 }
1278 static bool send_my_tt_response(struct bat_priv *bat_priv,
1279 struct tt_query_packet *tt_request)
1280 {
1281 struct orig_node *orig_node = NULL;
1282 struct neigh_node *neigh_node = NULL;
1283 struct hard_iface *primary_if = NULL;
1284 uint8_t my_ttvn, req_ttvn, ttvn;
1285 int ret = false;
1286 unsigned char *tt_buff;
1287 bool full_table;
1288 uint16_t tt_len, tt_tot;
1289 struct sk_buff *skb = NULL;
1290 struct tt_query_packet *tt_response;
1291
1292 bat_dbg(DBG_TT, bat_priv,
1293 "Received TT_REQUEST from %pM for "
1294 "ttvn: %u (me) [%c]\n", tt_request->src,
1295 tt_request->ttvn,
1296 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1297
1298
1299 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1300 req_ttvn = tt_request->ttvn;
1301
1302 orig_node = get_orig_node(bat_priv, tt_request->src);
1303 if (!orig_node)
1304 goto out;
1305
1306 neigh_node = orig_node_get_router(orig_node);
1307 if (!neigh_node)
1308 goto out;
1309
1310 primary_if = primary_if_get_selected(bat_priv);
1311 if (!primary_if)
1312 goto out;
1313
1314 /* If the full table has been explicitly requested or the gap
1315 * is too big send the whole local translation table */
1316 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1317 !bat_priv->tt_buff)
1318 full_table = true;
1319 else
1320 full_table = false;
1321
1322 /* In this version, fragmentation is not implemented, then
1323 * I'll send only one packet with as much TT entries as I can */
1324 if (!full_table) {
1325 spin_lock_bh(&bat_priv->tt_buff_lock);
1326 tt_len = bat_priv->tt_buff_len;
1327 tt_tot = tt_len / sizeof(struct tt_change);
1328
1329 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1330 tt_len + ETH_HLEN);
1331 if (!skb)
1332 goto unlock;
1333
1334 skb_reserve(skb, ETH_HLEN);
1335 tt_response = (struct tt_query_packet *)skb_put(skb,
1336 sizeof(struct tt_query_packet) + tt_len);
1337 tt_response->ttvn = req_ttvn;
1338 tt_response->tt_data = htons(tt_tot);
1339
1340 tt_buff = skb->data + sizeof(struct tt_query_packet);
1341 memcpy(tt_buff, bat_priv->tt_buff,
1342 bat_priv->tt_buff_len);
1343 spin_unlock_bh(&bat_priv->tt_buff_lock);
1344 } else {
1345 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1346 sizeof(struct tt_change);
1347 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1348
1349 skb = tt_response_fill_table(tt_len, ttvn,
1350 bat_priv->tt_local_hash,
1351 primary_if, tt_local_valid_entry,
1352 NULL);
1353 if (!skb)
1354 goto out;
1355
1356 tt_response = (struct tt_query_packet *)skb->data;
1357 }
1358
1359 tt_response->packet_type = BAT_TT_QUERY;
1360 tt_response->version = COMPAT_VERSION;
1361 tt_response->ttl = TTL;
1362 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1363 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1364 tt_response->flags = TT_RESPONSE;
1365
1366 if (full_table)
1367 tt_response->flags |= TT_FULL_TABLE;
1368
1369 bat_dbg(DBG_TT, bat_priv,
1370 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1371 orig_node->orig, neigh_node->addr,
1372 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1373
1374 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1375 ret = true;
1376 goto out;
1377
1378 unlock:
1379 spin_unlock_bh(&bat_priv->tt_buff_lock);
1380 out:
1381 if (orig_node)
1382 orig_node_free_ref(orig_node);
1383 if (neigh_node)
1384 neigh_node_free_ref(neigh_node);
1385 if (primary_if)
1386 hardif_free_ref(primary_if);
1387 if (!ret)
1388 kfree_skb(skb);
1389 /* This packet was for me, so it doesn't need to be re-routed */
1390 return true;
1391 }
1392
1393 bool send_tt_response(struct bat_priv *bat_priv,
1394 struct tt_query_packet *tt_request)
1395 {
1396 if (is_my_mac(tt_request->dst))
1397 return send_my_tt_response(bat_priv, tt_request);
1398 else
1399 return send_other_tt_response(bat_priv, tt_request);
1400 }
1401
1402 static void _tt_update_changes(struct bat_priv *bat_priv,
1403 struct orig_node *orig_node,
1404 struct tt_change *tt_change,
1405 uint16_t tt_num_changes, uint8_t ttvn)
1406 {
1407 int i;
1408
1409 for (i = 0; i < tt_num_changes; i++) {
1410 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1411 tt_global_del(bat_priv, orig_node,
1412 (tt_change + i)->addr,
1413 "tt removed by changes",
1414 (tt_change + i)->flags & TT_CLIENT_ROAM);
1415 else
1416 if (!tt_global_add(bat_priv, orig_node,
1417 (tt_change + i)->addr, ttvn, false,
1418 (tt_change + i)->flags &
1419 TT_CLIENT_WIFI))
1420 /* In case of problem while storing a
1421 * global_entry, we stop the updating
1422 * procedure without committing the
1423 * ttvn change. This will avoid to send
1424 * corrupted data on tt_request
1425 */
1426 return;
1427 }
1428 }
1429
1430 static void tt_fill_gtable(struct bat_priv *bat_priv,
1431 struct tt_query_packet *tt_response)
1432 {
1433 struct orig_node *orig_node = NULL;
1434
1435 orig_node = orig_hash_find(bat_priv, tt_response->src);
1436 if (!orig_node)
1437 goto out;
1438
1439 /* Purge the old table first.. */
1440 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1441
1442 _tt_update_changes(bat_priv, orig_node,
1443 (struct tt_change *)(tt_response + 1),
1444 tt_response->tt_data, tt_response->ttvn);
1445
1446 spin_lock_bh(&orig_node->tt_buff_lock);
1447 kfree(orig_node->tt_buff);
1448 orig_node->tt_buff_len = 0;
1449 orig_node->tt_buff = NULL;
1450 spin_unlock_bh(&orig_node->tt_buff_lock);
1451
1452 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1453
1454 out:
1455 if (orig_node)
1456 orig_node_free_ref(orig_node);
1457 }
1458
1459 static void tt_update_changes(struct bat_priv *bat_priv,
1460 struct orig_node *orig_node,
1461 uint16_t tt_num_changes, uint8_t ttvn,
1462 struct tt_change *tt_change)
1463 {
1464 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1465 ttvn);
1466
1467 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1468 tt_num_changes);
1469 atomic_set(&orig_node->last_ttvn, ttvn);
1470 }
1471
1472 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1473 {
1474 struct tt_local_entry *tt_local_entry = NULL;
1475 bool ret = false;
1476
1477 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1478 if (!tt_local_entry)
1479 goto out;
1480 /* Check if the client has been logically deleted (but is kept for
1481 * consistency purpose) */
1482 if (tt_local_entry->flags & TT_CLIENT_PENDING)
1483 goto out;
1484 ret = true;
1485 out:
1486 if (tt_local_entry)
1487 tt_local_entry_free_ref(tt_local_entry);
1488 return ret;
1489 }
1490
1491 void handle_tt_response(struct bat_priv *bat_priv,
1492 struct tt_query_packet *tt_response)
1493 {
1494 struct tt_req_node *node, *safe;
1495 struct orig_node *orig_node = NULL;
1496
1497 bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1498 "ttvn %d t_size: %d [%c]\n",
1499 tt_response->src, tt_response->ttvn,
1500 tt_response->tt_data,
1501 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1502
1503 orig_node = orig_hash_find(bat_priv, tt_response->src);
1504 if (!orig_node)
1505 goto out;
1506
1507 if (tt_response->flags & TT_FULL_TABLE)
1508 tt_fill_gtable(bat_priv, tt_response);
1509 else
1510 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1511 tt_response->ttvn,
1512 (struct tt_change *)(tt_response + 1));
1513
1514 /* Delete the tt_req_node from pending tt_requests list */
1515 spin_lock_bh(&bat_priv->tt_req_list_lock);
1516 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1517 if (!compare_eth(node->addr, tt_response->src))
1518 continue;
1519 list_del(&node->list);
1520 kfree(node);
1521 }
1522 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1523
1524 /* Recalculate the CRC for this orig_node and store it */
1525 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1526 /* Roaming phase is over: tables are in sync again. I can
1527 * unset the flag */
1528 orig_node->tt_poss_change = false;
1529 out:
1530 if (orig_node)
1531 orig_node_free_ref(orig_node);
1532 }
1533
1534 int tt_init(struct bat_priv *bat_priv)
1535 {
1536 if (!tt_local_init(bat_priv))
1537 return 0;
1538
1539 if (!tt_global_init(bat_priv))
1540 return 0;
1541
1542 tt_start_timer(bat_priv);
1543
1544 return 1;
1545 }
1546
1547 static void tt_roam_list_free(struct bat_priv *bat_priv)
1548 {
1549 struct tt_roam_node *node, *safe;
1550
1551 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1552
1553 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1554 list_del(&node->list);
1555 kfree(node);
1556 }
1557
1558 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1559 }
1560
1561 static void tt_roam_purge(struct bat_priv *bat_priv)
1562 {
1563 struct tt_roam_node *node, *safe;
1564
1565 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1566 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1567 if (!is_out_of_time(node->first_time,
1568 ROAMING_MAX_TIME * 1000))
1569 continue;
1570
1571 list_del(&node->list);
1572 kfree(node);
1573 }
1574 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1575 }
1576
1577 /* This function checks whether the client already reached the
1578 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1579 * will not be sent.
1580 *
1581 * returns true if the ROAMING_ADV can be sent, false otherwise */
1582 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1583 uint8_t *client)
1584 {
1585 struct tt_roam_node *tt_roam_node;
1586 bool ret = false;
1587
1588 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1589 /* The new tt_req will be issued only if I'm not waiting for a
1590 * reply from the same orig_node yet */
1591 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1592 if (!compare_eth(tt_roam_node->addr, client))
1593 continue;
1594
1595 if (is_out_of_time(tt_roam_node->first_time,
1596 ROAMING_MAX_TIME * 1000))
1597 continue;
1598
1599 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1600 /* Sorry, you roamed too many times! */
1601 goto unlock;
1602 ret = true;
1603 break;
1604 }
1605
1606 if (!ret) {
1607 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1608 if (!tt_roam_node)
1609 goto unlock;
1610
1611 tt_roam_node->first_time = jiffies;
1612 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1613 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1614
1615 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1616 ret = true;
1617 }
1618
1619 unlock:
1620 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1621 return ret;
1622 }
1623
1624 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1625 struct orig_node *orig_node)
1626 {
1627 struct neigh_node *neigh_node = NULL;
1628 struct sk_buff *skb = NULL;
1629 struct roam_adv_packet *roam_adv_packet;
1630 int ret = 1;
1631 struct hard_iface *primary_if;
1632
1633 /* before going on we have to check whether the client has
1634 * already roamed to us too many times */
1635 if (!tt_check_roam_count(bat_priv, client))
1636 goto out;
1637
1638 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1639 if (!skb)
1640 goto out;
1641
1642 skb_reserve(skb, ETH_HLEN);
1643
1644 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1645 sizeof(struct roam_adv_packet));
1646
1647 roam_adv_packet->packet_type = BAT_ROAM_ADV;
1648 roam_adv_packet->version = COMPAT_VERSION;
1649 roam_adv_packet->ttl = TTL;
1650 primary_if = primary_if_get_selected(bat_priv);
1651 if (!primary_if)
1652 goto out;
1653 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1654 hardif_free_ref(primary_if);
1655 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1656 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1657
1658 neigh_node = orig_node_get_router(orig_node);
1659 if (!neigh_node)
1660 goto out;
1661
1662 bat_dbg(DBG_TT, bat_priv,
1663 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1664 orig_node->orig, client, neigh_node->addr);
1665
1666 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1667 ret = 0;
1668
1669 out:
1670 if (neigh_node)
1671 neigh_node_free_ref(neigh_node);
1672 if (ret)
1673 kfree_skb(skb);
1674 return;
1675 }
1676
1677 static void tt_purge(struct work_struct *work)
1678 {
1679 struct delayed_work *delayed_work =
1680 container_of(work, struct delayed_work, work);
1681 struct bat_priv *bat_priv =
1682 container_of(delayed_work, struct bat_priv, tt_work);
1683
1684 tt_local_purge(bat_priv);
1685 tt_global_roam_purge(bat_priv);
1686 tt_req_purge(bat_priv);
1687 tt_roam_purge(bat_priv);
1688
1689 tt_start_timer(bat_priv);
1690 }
1691
1692 void tt_free(struct bat_priv *bat_priv)
1693 {
1694 cancel_delayed_work_sync(&bat_priv->tt_work);
1695
1696 tt_local_table_free(bat_priv);
1697 tt_global_table_free(bat_priv);
1698 tt_req_list_free(bat_priv);
1699 tt_changes_list_free(bat_priv);
1700 tt_roam_list_free(bat_priv);
1701
1702 kfree(bat_priv->tt_buff);
1703 }
1704
1705 /* This function will reset the specified flags from all the entries in
1706 * the given hash table and will increment num_local_tt for each involved
1707 * entry */
1708 static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
1709 {
1710 int i;
1711 struct hashtable_t *hash = bat_priv->tt_local_hash;
1712 struct hlist_head *head;
1713 struct hlist_node *node;
1714 struct tt_local_entry *tt_local_entry;
1715
1716 if (!hash)
1717 return;
1718
1719 for (i = 0; i < hash->size; i++) {
1720 head = &hash->table[i];
1721
1722 rcu_read_lock();
1723 hlist_for_each_entry_rcu(tt_local_entry, node,
1724 head, hash_entry) {
1725 tt_local_entry->flags &= ~flags;
1726 atomic_inc(&bat_priv->num_local_tt);
1727 }
1728 rcu_read_unlock();
1729 }
1730
1731 }
1732
1733 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1734 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1735 {
1736 struct hashtable_t *hash = bat_priv->tt_local_hash;
1737 struct tt_local_entry *tt_local_entry;
1738 struct hlist_node *node, *node_tmp;
1739 struct hlist_head *head;
1740 spinlock_t *list_lock; /* protects write access to the hash lists */
1741 int i;
1742
1743 if (!hash)
1744 return;
1745
1746 for (i = 0; i < hash->size; i++) {
1747 head = &hash->table[i];
1748 list_lock = &hash->list_locks[i];
1749
1750 spin_lock_bh(list_lock);
1751 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
1752 head, hash_entry) {
1753 if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
1754 continue;
1755
1756 bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1757 "(%pM): pending\n", tt_local_entry->addr);
1758
1759 atomic_dec(&bat_priv->num_local_tt);
1760 hlist_del_rcu(node);
1761 tt_local_entry_free_ref(tt_local_entry);
1762 }
1763 spin_unlock_bh(list_lock);
1764 }
1765
1766 }
1767
1768 void tt_commit_changes(struct bat_priv *bat_priv)
1769 {
1770 tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
1771 tt_local_purge_pending_clients(bat_priv);
1772
1773 /* Increment the TTVN only once per OGM interval */
1774 atomic_inc(&bat_priv->ttvn);
1775 bat_priv->tt_poss_change = false;
1776 }
1777
1778 bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
1779 {
1780 struct tt_local_entry *tt_local_entry = NULL;
1781 struct tt_global_entry *tt_global_entry = NULL;
1782 bool ret = true;
1783
1784 if (!atomic_read(&bat_priv->ap_isolation))
1785 return false;
1786
1787 tt_local_entry = tt_local_hash_find(bat_priv, dst);
1788 if (!tt_local_entry)
1789 goto out;
1790
1791 tt_global_entry = tt_global_hash_find(bat_priv, src);
1792 if (!tt_global_entry)
1793 goto out;
1794
1795 if (_is_ap_isolated(tt_local_entry, tt_global_entry))
1796 goto out;
1797
1798 ret = false;
1799
1800 out:
1801 if (tt_global_entry)
1802 tt_global_entry_free_ref(tt_global_entry);
1803 if (tt_local_entry)
1804 tt_local_entry_free_ref(tt_local_entry);
1805 return ret;
1806 }
1807
1808 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
1809 const unsigned char *tt_buff, uint8_t tt_num_changes,
1810 uint8_t ttvn, uint16_t tt_crc)
1811 {
1812 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
1813 bool full_table = true;
1814
1815 /* the ttvn increased by one -> we can apply the attached changes */
1816 if (ttvn - orig_ttvn == 1) {
1817 /* the OGM could not contain the changes due to their size or
1818 * because they have already been sent TT_OGM_APPEND_MAX times.
1819 * In this case send a tt request */
1820 if (!tt_num_changes) {
1821 full_table = false;
1822 goto request_table;
1823 }
1824
1825 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
1826 (struct tt_change *)tt_buff);
1827
1828 /* Even if we received the precomputed crc with the OGM, we
1829 * prefer to recompute it to spot any possible inconsistency
1830 * in the global table */
1831 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1832
1833 /* The ttvn alone is not enough to guarantee consistency
1834 * because a single value could represent different states
1835 * (due to the wrap around). Thus a node has to check whether
1836 * the resulting table (after applying the changes) is still
1837 * consistent or not. E.g. a node could disconnect while its
1838 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
1839 * checking the CRC value is mandatory to detect the
1840 * inconsistency */
1841 if (orig_node->tt_crc != tt_crc)
1842 goto request_table;
1843
1844 /* Roaming phase is over: tables are in sync again. I can
1845 * unset the flag */
1846 orig_node->tt_poss_change = false;
1847 } else {
1848 /* if we missed more than one change or our tables are not
1849 * in sync anymore -> request fresh tt data */
1850 if (ttvn != orig_ttvn || orig_node->tt_crc != tt_crc) {
1851 request_table:
1852 bat_dbg(DBG_TT, bat_priv, "TT inconsistency for %pM. "
1853 "Need to retrieve the correct information "
1854 "(ttvn: %u last_ttvn: %u crc: %u last_crc: "
1855 "%u num_changes: %u)\n", orig_node->orig, ttvn,
1856 orig_ttvn, tt_crc, orig_node->tt_crc,
1857 tt_num_changes);
1858 send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
1859 full_table);
1860 return;
1861 }
1862 }
1863 }
linux-next