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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / net / batman-adv / translation-table.c
blobab8dea8b0b2e6ae0bcf5f29e2253f0e6aa37b207
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_tt(const struct hlist_node *node, const void *data2)
40 {
41 const void *data1 = container_of(node, struct tt_common_entry,
42 hash_entry);
43
44 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
45 }
46
47 static void tt_start_timer(struct bat_priv *bat_priv)
48 {
49 INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
50 queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
51 msecs_to_jiffies(5000));
52 }
53
54 static struct tt_common_entry *tt_hash_find(struct hashtable_t *hash,
55 const void *data)
56 {
57 struct hlist_head *head;
58 struct hlist_node *node;
59 struct tt_common_entry *tt_common_entry, *tt_common_entry_tmp = NULL;
60 uint32_t index;
61
62 if (!hash)
63 return NULL;
64
65 index = choose_orig(data, hash->size);
66 head = &hash->table[index];
67
68 rcu_read_lock();
69 hlist_for_each_entry_rcu(tt_common_entry, node, head, hash_entry) {
70 if (!compare_eth(tt_common_entry, data))
71 continue;
72
73 if (!atomic_inc_not_zero(&tt_common_entry->refcount))
74 continue;
75
76 tt_common_entry_tmp = tt_common_entry;
77 break;
78 }
79 rcu_read_unlock();
80
81 return tt_common_entry_tmp;
82 }
83
84 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
85 const void *data)
86 {
87 struct tt_common_entry *tt_common_entry;
88 struct tt_local_entry *tt_local_entry = NULL;
89
90 tt_common_entry = tt_hash_find(bat_priv->tt_local_hash, data);
91 if (tt_common_entry)
92 tt_local_entry = container_of(tt_common_entry,
93 struct tt_local_entry, common);
94 return tt_local_entry;
95 }
96
97 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
98 const void *data)
99 {
100 struct tt_common_entry *tt_common_entry;
101 struct tt_global_entry *tt_global_entry = NULL;
102
103 tt_common_entry = tt_hash_find(bat_priv->tt_global_hash, data);
104 if (tt_common_entry)
105 tt_global_entry = container_of(tt_common_entry,
106 struct tt_global_entry, common);
107 return tt_global_entry;
108
109 }
110
111 static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
112 {
113 unsigned long deadline;
114 deadline = starting_time + msecs_to_jiffies(timeout);
115
116 return time_after(jiffies, deadline);
117 }
118
119 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
120 {
121 if (atomic_dec_and_test(&tt_local_entry->common.refcount))
122 kfree_rcu(tt_local_entry, common.rcu);
123 }
124
125 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
126 {
127 struct tt_common_entry *tt_common_entry;
128 struct tt_global_entry *tt_global_entry;
129
130 tt_common_entry = container_of(rcu, struct tt_common_entry, rcu);
131 tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
132 common);
133
134 if (tt_global_entry->orig_node)
135 orig_node_free_ref(tt_global_entry->orig_node);
136
137 kfree(tt_global_entry);
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->common.refcount))
143 call_rcu(&tt_global_entry->common.rcu,
144 tt_global_entry_free_rcu);
145 }
146
147 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
148 uint8_t flags)
149 {
150 struct tt_change_node *tt_change_node;
151
152 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
153
154 if (!tt_change_node)
155 return;
156
157 tt_change_node->change.flags = flags;
158 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
159
160 spin_lock_bh(&bat_priv->tt_changes_list_lock);
161 /* track the change in the OGMinterval list */
162 list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
163 atomic_inc(&bat_priv->tt_local_changes);
164 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
165
166 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
167 }
168
169 int tt_len(int changes_num)
170 {
171 return changes_num * sizeof(struct tt_change);
172 }
173
174 static int tt_local_init(struct bat_priv *bat_priv)
175 {
176 if (bat_priv->tt_local_hash)
177 return 1;
178
179 bat_priv->tt_local_hash = hash_new(1024);
180
181 if (!bat_priv->tt_local_hash)
182 return 0;
183
184 return 1;
185 }
186
187 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
188 int ifindex)
189 {
190 struct bat_priv *bat_priv = netdev_priv(soft_iface);
191 struct tt_local_entry *tt_local_entry = NULL;
192 struct tt_global_entry *tt_global_entry = NULL;
193 int hash_added;
194
195 tt_local_entry = tt_local_hash_find(bat_priv, addr);
196
197 if (tt_local_entry) {
198 tt_local_entry->last_seen = jiffies;
199 goto out;
200 }
201
202 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
203 if (!tt_local_entry)
204 goto out;
205
206 bat_dbg(DBG_TT, bat_priv,
207 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
208 (uint8_t)atomic_read(&bat_priv->ttvn));
209
210 memcpy(tt_local_entry->common.addr, addr, ETH_ALEN);
211 tt_local_entry->common.flags = NO_FLAGS;
212 if (is_wifi_iface(ifindex))
213 tt_local_entry->common.flags |= TT_CLIENT_WIFI;
214 atomic_set(&tt_local_entry->common.refcount, 2);
215 tt_local_entry->last_seen = jiffies;
216
217 /* the batman interface mac address should never be purged */
218 if (compare_eth(addr, soft_iface->dev_addr))
219 tt_local_entry->common.flags |= TT_CLIENT_NOPURGE;
220
221 hash_added = hash_add(bat_priv->tt_local_hash, compare_tt, choose_orig,
222 &tt_local_entry->common,
223 &tt_local_entry->common.hash_entry);
224
225 if (unlikely(hash_added != 0)) {
226 /* remove the reference for the hash */
227 tt_local_entry_free_ref(tt_local_entry);
228 goto out;
229 }
230
231 tt_local_event(bat_priv, addr, tt_local_entry->common.flags);
232
233 /* The local entry has to be marked as NEW to avoid to send it in
234 * a full table response going out before the next ttvn increment
235 * (consistency check) */
236 tt_local_entry->common.flags |= TT_CLIENT_NEW;
237
238 /* remove address from global hash if present */
239 tt_global_entry = tt_global_hash_find(bat_priv, addr);
240
241 /* Check whether it is a roaming! */
242 if (tt_global_entry) {
243 /* This node is probably going to update its tt table */
244 tt_global_entry->orig_node->tt_poss_change = true;
245 /* The global entry has to be marked as ROAMING and has to be
246 * kept for consistency purpose */
247 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
248 tt_global_entry->roam_at = jiffies;
249 send_roam_adv(bat_priv, tt_global_entry->common.addr,
250 tt_global_entry->orig_node);
251 }
252 out:
253 if (tt_local_entry)
254 tt_local_entry_free_ref(tt_local_entry);
255 if (tt_global_entry)
256 tt_global_entry_free_ref(tt_global_entry);
257 }
258
259 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
260 unsigned char *buff, int buff_len)
261 {
262 int count = 0, tot_changes = 0;
263 struct tt_change_node *entry, *safe;
264
265 if (buff_len > 0)
266 tot_changes = buff_len / tt_len(1);
267
268 spin_lock_bh(&bat_priv->tt_changes_list_lock);
269 atomic_set(&bat_priv->tt_local_changes, 0);
270
271 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
272 list) {
273 if (count < tot_changes) {
274 memcpy(buff + tt_len(count),
275 &entry->change, sizeof(struct tt_change));
276 count++;
277 }
278 list_del(&entry->list);
279 kfree(entry);
280 }
281 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
282
283 /* Keep the buffer for possible tt_request */
284 spin_lock_bh(&bat_priv->tt_buff_lock);
285 kfree(bat_priv->tt_buff);
286 bat_priv->tt_buff_len = 0;
287 bat_priv->tt_buff = NULL;
288 /* We check whether this new OGM has no changes due to size
289 * problems */
290 if (buff_len > 0) {
291 /**
292 * if kmalloc() fails we will reply with the full table
293 * instead of providing the diff
294 */
295 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
296 if (bat_priv->tt_buff) {
297 memcpy(bat_priv->tt_buff, buff, buff_len);
298 bat_priv->tt_buff_len = buff_len;
299 }
300 }
301 spin_unlock_bh(&bat_priv->tt_buff_lock);
302
303 return tot_changes;
304 }
305
306 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
307 {
308 struct net_device *net_dev = (struct net_device *)seq->private;
309 struct bat_priv *bat_priv = netdev_priv(net_dev);
310 struct hashtable_t *hash = bat_priv->tt_local_hash;
311 struct tt_common_entry *tt_common_entry;
312 struct hard_iface *primary_if;
313 struct hlist_node *node;
314 struct hlist_head *head;
315 uint32_t i;
316 int ret = 0;
317
318 primary_if = primary_if_get_selected(bat_priv);
319 if (!primary_if) {
320 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
321 "please specify interfaces to enable it\n",
322 net_dev->name);
323 goto out;
324 }
325
326 if (primary_if->if_status != IF_ACTIVE) {
327 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
328 "primary interface not active\n",
329 net_dev->name);
330 goto out;
331 }
332
333 seq_printf(seq, "Locally retrieved addresses (from %s) "
334 "announced via TT (TTVN: %u):\n",
335 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
336
337 for (i = 0; i < hash->size; i++) {
338 head = &hash->table[i];
339
340 rcu_read_lock();
341 hlist_for_each_entry_rcu(tt_common_entry, node,
342 head, hash_entry) {
343 seq_printf(seq, " * %pM [%c%c%c%c%c]\n",
344 tt_common_entry->addr,
345 (tt_common_entry->flags &
346 TT_CLIENT_ROAM ? 'R' : '.'),
347 (tt_common_entry->flags &
348 TT_CLIENT_NOPURGE ? 'P' : '.'),
349 (tt_common_entry->flags &
350 TT_CLIENT_NEW ? 'N' : '.'),
351 (tt_common_entry->flags &
352 TT_CLIENT_PENDING ? 'X' : '.'),
353 (tt_common_entry->flags &
354 TT_CLIENT_WIFI ? 'W' : '.'));
355 }
356 rcu_read_unlock();
357 }
358 out:
359 if (primary_if)
360 hardif_free_ref(primary_if);
361 return ret;
362 }
363
364 static void tt_local_set_pending(struct bat_priv *bat_priv,
365 struct tt_local_entry *tt_local_entry,
366 uint16_t flags)
367 {
368 tt_local_event(bat_priv, tt_local_entry->common.addr,
369 tt_local_entry->common.flags | flags);
370
371 /* The local client has to be marked as "pending to be removed" but has
372 * to be kept in the table in order to send it in a full table
373 * response issued before the net ttvn increment (consistency check) */
374 tt_local_entry->common.flags |= TT_CLIENT_PENDING;
375 }
376
377 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
378 const char *message, bool roaming)
379 {
380 struct tt_local_entry *tt_local_entry = NULL;
381
382 tt_local_entry = tt_local_hash_find(bat_priv, addr);
383 if (!tt_local_entry)
384 goto out;
385
386 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
387 (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
388
389 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
390 "%s\n", tt_local_entry->common.addr, message);
391 out:
392 if (tt_local_entry)
393 tt_local_entry_free_ref(tt_local_entry);
394 }
395
396 static void tt_local_purge(struct bat_priv *bat_priv)
397 {
398 struct hashtable_t *hash = bat_priv->tt_local_hash;
399 struct tt_local_entry *tt_local_entry;
400 struct tt_common_entry *tt_common_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 uint32_t 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_common_entry, node, node_tmp,
412 head, hash_entry) {
413 tt_local_entry = container_of(tt_common_entry,
414 struct tt_local_entry,
415 common);
416 if (tt_local_entry->common.flags & TT_CLIENT_NOPURGE)
417 continue;
418
419 /* entry already marked for deletion */
420 if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
421 continue;
422
423 if (!is_out_of_time(tt_local_entry->last_seen,
424 TT_LOCAL_TIMEOUT * 1000))
425 continue;
426
427 tt_local_set_pending(bat_priv, tt_local_entry,
428 TT_CLIENT_DEL);
429 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
430 "pending to be removed: timed out\n",
431 tt_local_entry->common.addr);
432 }
433 spin_unlock_bh(list_lock);
434 }
435
436 }
437
438 static void tt_local_table_free(struct bat_priv *bat_priv)
439 {
440 struct hashtable_t *hash;
441 spinlock_t *list_lock; /* protects write access to the hash lists */
442 struct tt_common_entry *tt_common_entry;
443 struct tt_local_entry *tt_local_entry;
444 struct hlist_node *node, *node_tmp;
445 struct hlist_head *head;
446 uint32_t i;
447
448 if (!bat_priv->tt_local_hash)
449 return;
450
451 hash = bat_priv->tt_local_hash;
452
453 for (i = 0; i < hash->size; i++) {
454 head = &hash->table[i];
455 list_lock = &hash->list_locks[i];
456
457 spin_lock_bh(list_lock);
458 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
459 head, hash_entry) {
460 hlist_del_rcu(node);
461 tt_local_entry = container_of(tt_common_entry,
462 struct tt_local_entry,
463 common);
464 tt_local_entry_free_ref(tt_local_entry);
465 }
466 spin_unlock_bh(list_lock);
467 }
468
469 hash_destroy(hash);
470
471 bat_priv->tt_local_hash = NULL;
472 }
473
474 static int tt_global_init(struct bat_priv *bat_priv)
475 {
476 if (bat_priv->tt_global_hash)
477 return 1;
478
479 bat_priv->tt_global_hash = hash_new(1024);
480
481 if (!bat_priv->tt_global_hash)
482 return 0;
483
484 return 1;
485 }
486
487 static void tt_changes_list_free(struct bat_priv *bat_priv)
488 {
489 struct tt_change_node *entry, *safe;
490
491 spin_lock_bh(&bat_priv->tt_changes_list_lock);
492
493 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
494 list) {
495 list_del(&entry->list);
496 kfree(entry);
497 }
498
499 atomic_set(&bat_priv->tt_local_changes, 0);
500 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
501 }
502
503 /* caller must hold orig_node refcount */
504 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
505 const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
506 bool wifi)
507 {
508 struct tt_global_entry *tt_global_entry;
509 struct orig_node *orig_node_tmp;
510 int ret = 0;
511 int hash_added;
512
513 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
514
515 if (!tt_global_entry) {
516 tt_global_entry =
517 kmalloc(sizeof(*tt_global_entry),
518 GFP_ATOMIC);
519 if (!tt_global_entry)
520 goto out;
521
522 memcpy(tt_global_entry->common.addr, tt_addr, ETH_ALEN);
523 tt_global_entry->common.flags = NO_FLAGS;
524 atomic_set(&tt_global_entry->common.refcount, 2);
525 /* Assign the new orig_node */
526 atomic_inc(&orig_node->refcount);
527 tt_global_entry->orig_node = orig_node;
528 tt_global_entry->ttvn = ttvn;
529 tt_global_entry->roam_at = 0;
530
531 hash_added = hash_add(bat_priv->tt_global_hash, compare_tt,
532 choose_orig, &tt_global_entry->common,
533 &tt_global_entry->common.hash_entry);
534
535 if (unlikely(hash_added != 0)) {
536 /* remove the reference for the hash */
537 tt_global_entry_free_ref(tt_global_entry);
538 goto out_remove;
539 }
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->common.flags = NO_FLAGS;
551 tt_global_entry->ttvn = ttvn;
552 tt_global_entry->roam_at = 0;
553 }
554
555 if (wifi)
556 tt_global_entry->common.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->common.addr, orig_node->orig);
561
562 out_remove:
563 /* remove address from local hash if present */
564 tt_local_remove(bat_priv, tt_global_entry->common.addr,
565 "global tt received", roaming);
566 ret = 1;
567 out:
568 if (tt_global_entry)
569 tt_global_entry_free_ref(tt_global_entry);
570 return ret;
571 }
572
573 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
574 {
575 struct net_device *net_dev = (struct net_device *)seq->private;
576 struct bat_priv *bat_priv = netdev_priv(net_dev);
577 struct hashtable_t *hash = bat_priv->tt_global_hash;
578 struct tt_common_entry *tt_common_entry;
579 struct tt_global_entry *tt_global_entry;
580 struct hard_iface *primary_if;
581 struct hlist_node *node;
582 struct hlist_head *head;
583 uint32_t i;
584 int ret = 0;
585
586 primary_if = primary_if_get_selected(bat_priv);
587 if (!primary_if) {
588 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
589 "specify interfaces to enable it\n",
590 net_dev->name);
591 goto out;
592 }
593
594 if (primary_if->if_status != IF_ACTIVE) {
595 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
596 "primary interface not active\n",
597 net_dev->name);
598 goto out;
599 }
600
601 seq_printf(seq,
602 "Globally announced TT entries received via the mesh %s\n",
603 net_dev->name);
604 seq_printf(seq, " %-13s %s %-15s %s %s\n",
605 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
606
607 for (i = 0; i < hash->size; i++) {
608 head = &hash->table[i];
609
610 rcu_read_lock();
611 hlist_for_each_entry_rcu(tt_common_entry, node,
612 head, hash_entry) {
613 tt_global_entry = container_of(tt_common_entry,
614 struct tt_global_entry,
615 common);
616 seq_printf(seq, " * %pM (%3u) via %pM (%3u) "
617 "[%c%c%c]\n",
618 tt_global_entry->common.addr,
619 tt_global_entry->ttvn,
620 tt_global_entry->orig_node->orig,
621 (uint8_t) atomic_read(
622 &tt_global_entry->orig_node->
623 last_ttvn),
624 (tt_global_entry->common.flags &
625 TT_CLIENT_ROAM ? 'R' : '.'),
626 (tt_global_entry->common.flags &
627 TT_CLIENT_PENDING ? 'X' : '.'),
628 (tt_global_entry->common.flags &
629 TT_CLIENT_WIFI ? 'W' : '.'));
630 }
631 rcu_read_unlock();
632 }
633 out:
634 if (primary_if)
635 hardif_free_ref(primary_if);
636 return ret;
637 }
638
639 static void _tt_global_del(struct bat_priv *bat_priv,
640 struct tt_global_entry *tt_global_entry,
641 const char *message)
642 {
643 if (!tt_global_entry)
644 goto out;
645
646 bat_dbg(DBG_TT, bat_priv,
647 "Deleting global tt entry %pM (via %pM): %s\n",
648 tt_global_entry->common.addr, tt_global_entry->orig_node->orig,
649 message);
650
651 atomic_dec(&tt_global_entry->orig_node->tt_size);
652
653 hash_remove(bat_priv->tt_global_hash, compare_tt, choose_orig,
654 tt_global_entry->common.addr);
655 out:
656 if (tt_global_entry)
657 tt_global_entry_free_ref(tt_global_entry);
658 }
659
660 void tt_global_del(struct bat_priv *bat_priv,
661 struct orig_node *orig_node, const unsigned char *addr,
662 const char *message, bool roaming)
663 {
664 struct tt_global_entry *tt_global_entry = NULL;
665 struct tt_local_entry *tt_local_entry = NULL;
666
667 tt_global_entry = tt_global_hash_find(bat_priv, addr);
668 if (!tt_global_entry)
669 goto out;
670
671 if (tt_global_entry->orig_node == orig_node) {
672 if (roaming) {
673 /* if we are deleting a global entry due to a roam
674 * event, there are two possibilities:
675 * 1) the client roamed from node A to node B => we mark
676 * it with TT_CLIENT_ROAM, we start a timer and we
677 * wait for node B to claim it. In case of timeout
678 * the entry is purged.
679 * 2) the client roamed to us => we can directly delete
680 * the global entry, since it is useless now. */
681 tt_local_entry = tt_local_hash_find(bat_priv,
682 tt_global_entry->common.addr);
683 if (!tt_local_entry) {
684 tt_global_entry->common.flags |= TT_CLIENT_ROAM;
685 tt_global_entry->roam_at = jiffies;
686 goto out;
687 }
688 }
689 _tt_global_del(bat_priv, tt_global_entry, message);
690 }
691 out:
692 if (tt_global_entry)
693 tt_global_entry_free_ref(tt_global_entry);
694 if (tt_local_entry)
695 tt_local_entry_free_ref(tt_local_entry);
696 }
697
698 void tt_global_del_orig(struct bat_priv *bat_priv,
699 struct orig_node *orig_node, const char *message)
700 {
701 struct tt_global_entry *tt_global_entry;
702 struct tt_common_entry *tt_common_entry;
703 uint32_t i;
704 struct hashtable_t *hash = bat_priv->tt_global_hash;
705 struct hlist_node *node, *safe;
706 struct hlist_head *head;
707 spinlock_t *list_lock; /* protects write access to the hash lists */
708
709 if (!hash)
710 return;
711
712 for (i = 0; i < hash->size; i++) {
713 head = &hash->table[i];
714 list_lock = &hash->list_locks[i];
715
716 spin_lock_bh(list_lock);
717 hlist_for_each_entry_safe(tt_common_entry, node, safe,
718 head, hash_entry) {
719 tt_global_entry = container_of(tt_common_entry,
720 struct tt_global_entry,
721 common);
722 if (tt_global_entry->orig_node == orig_node) {
723 bat_dbg(DBG_TT, bat_priv,
724 "Deleting global tt entry %pM "
725 "(via %pM): %s\n",
726 tt_global_entry->common.addr,
727 tt_global_entry->orig_node->orig,
728 message);
729 hlist_del_rcu(node);
730 tt_global_entry_free_ref(tt_global_entry);
731 }
732 }
733 spin_unlock_bh(list_lock);
734 }
735 atomic_set(&orig_node->tt_size, 0);
736 }
737
738 static void tt_global_roam_purge(struct bat_priv *bat_priv)
739 {
740 struct hashtable_t *hash = bat_priv->tt_global_hash;
741 struct tt_common_entry *tt_common_entry;
742 struct tt_global_entry *tt_global_entry;
743 struct hlist_node *node, *node_tmp;
744 struct hlist_head *head;
745 spinlock_t *list_lock; /* protects write access to the hash lists */
746 uint32_t i;
747
748 for (i = 0; i < hash->size; i++) {
749 head = &hash->table[i];
750 list_lock = &hash->list_locks[i];
751
752 spin_lock_bh(list_lock);
753 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
754 head, hash_entry) {
755 tt_global_entry = container_of(tt_common_entry,
756 struct tt_global_entry,
757 common);
758 if (!(tt_global_entry->common.flags & TT_CLIENT_ROAM))
759 continue;
760 if (!is_out_of_time(tt_global_entry->roam_at,
761 TT_CLIENT_ROAM_TIMEOUT * 1000))
762 continue;
763
764 bat_dbg(DBG_TT, bat_priv, "Deleting global "
765 "tt entry (%pM): Roaming timeout\n",
766 tt_global_entry->common.addr);
767 atomic_dec(&tt_global_entry->orig_node->tt_size);
768 hlist_del_rcu(node);
769 tt_global_entry_free_ref(tt_global_entry);
770 }
771 spin_unlock_bh(list_lock);
772 }
773
774 }
775
776 static void tt_global_table_free(struct bat_priv *bat_priv)
777 {
778 struct hashtable_t *hash;
779 spinlock_t *list_lock; /* protects write access to the hash lists */
780 struct tt_common_entry *tt_common_entry;
781 struct tt_global_entry *tt_global_entry;
782 struct hlist_node *node, *node_tmp;
783 struct hlist_head *head;
784 uint32_t i;
785
786 if (!bat_priv->tt_global_hash)
787 return;
788
789 hash = bat_priv->tt_global_hash;
790
791 for (i = 0; i < hash->size; i++) {
792 head = &hash->table[i];
793 list_lock = &hash->list_locks[i];
794
795 spin_lock_bh(list_lock);
796 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
797 head, hash_entry) {
798 hlist_del_rcu(node);
799 tt_global_entry = container_of(tt_common_entry,
800 struct tt_global_entry,
801 common);
802 tt_global_entry_free_ref(tt_global_entry);
803 }
804 spin_unlock_bh(list_lock);
805 }
806
807 hash_destroy(hash);
808
809 bat_priv->tt_global_hash = NULL;
810 }
811
812 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
813 struct tt_global_entry *tt_global_entry)
814 {
815 bool ret = false;
816
817 if (tt_local_entry->common.flags & TT_CLIENT_WIFI &&
818 tt_global_entry->common.flags & TT_CLIENT_WIFI)
819 ret = true;
820
821 return ret;
822 }
823
824 struct orig_node *transtable_search(struct bat_priv *bat_priv,
825 const uint8_t *src, const uint8_t *addr)
826 {
827 struct tt_local_entry *tt_local_entry = NULL;
828 struct tt_global_entry *tt_global_entry = NULL;
829 struct orig_node *orig_node = NULL;
830
831 if (src && atomic_read(&bat_priv->ap_isolation)) {
832 tt_local_entry = tt_local_hash_find(bat_priv, src);
833 if (!tt_local_entry)
834 goto out;
835 }
836
837 tt_global_entry = tt_global_hash_find(bat_priv, addr);
838 if (!tt_global_entry)
839 goto out;
840
841 /* check whether the clients should not communicate due to AP
842 * isolation */
843 if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
844 goto out;
845
846 if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
847 goto out;
848
849 /* A global client marked as PENDING has already moved from that
850 * originator */
851 if (tt_global_entry->common.flags & TT_CLIENT_PENDING)
852 goto out;
853
854 orig_node = tt_global_entry->orig_node;
855
856 out:
857 if (tt_global_entry)
858 tt_global_entry_free_ref(tt_global_entry);
859 if (tt_local_entry)
860 tt_local_entry_free_ref(tt_local_entry);
861
862 return orig_node;
863 }
864
865 /* Calculates the checksum of the local table of a given orig_node */
866 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
867 {
868 uint16_t total = 0, total_one;
869 struct hashtable_t *hash = bat_priv->tt_global_hash;
870 struct tt_common_entry *tt_common_entry;
871 struct tt_global_entry *tt_global_entry;
872 struct hlist_node *node;
873 struct hlist_head *head;
874 uint32_t i;
875 int j;
876
877 for (i = 0; i < hash->size; i++) {
878 head = &hash->table[i];
879
880 rcu_read_lock();
881 hlist_for_each_entry_rcu(tt_common_entry, node,
882 head, hash_entry) {
883 tt_global_entry = container_of(tt_common_entry,
884 struct tt_global_entry,
885 common);
886 if (compare_eth(tt_global_entry->orig_node,
887 orig_node)) {
888 /* Roaming clients are in the global table for
889 * consistency only. They don't have to be
890 * taken into account while computing the
891 * global crc */
892 if (tt_common_entry->flags & TT_CLIENT_ROAM)
893 continue;
894 total_one = 0;
895 for (j = 0; j < ETH_ALEN; j++)
896 total_one = crc16_byte(total_one,
897 tt_common_entry->addr[j]);
898 total ^= total_one;
899 }
900 }
901 rcu_read_unlock();
902 }
903
904 return total;
905 }
906
907 /* Calculates the checksum of the local table */
908 uint16_t tt_local_crc(struct bat_priv *bat_priv)
909 {
910 uint16_t total = 0, total_one;
911 struct hashtable_t *hash = bat_priv->tt_local_hash;
912 struct tt_common_entry *tt_common_entry;
913 struct hlist_node *node;
914 struct hlist_head *head;
915 uint32_t i;
916 int j;
917
918 for (i = 0; i < hash->size; i++) {
919 head = &hash->table[i];
920
921 rcu_read_lock();
922 hlist_for_each_entry_rcu(tt_common_entry, node,
923 head, hash_entry) {
924 /* not yet committed clients have not to be taken into
925 * account while computing the CRC */
926 if (tt_common_entry->flags & TT_CLIENT_NEW)
927 continue;
928 total_one = 0;
929 for (j = 0; j < ETH_ALEN; j++)
930 total_one = crc16_byte(total_one,
931 tt_common_entry->addr[j]);
932 total ^= total_one;
933 }
934 rcu_read_unlock();
935 }
936
937 return total;
938 }
939
940 static void tt_req_list_free(struct bat_priv *bat_priv)
941 {
942 struct tt_req_node *node, *safe;
943
944 spin_lock_bh(&bat_priv->tt_req_list_lock);
945
946 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
947 list_del(&node->list);
948 kfree(node);
949 }
950
951 spin_unlock_bh(&bat_priv->tt_req_list_lock);
952 }
953
954 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
955 const unsigned char *tt_buff, uint8_t tt_num_changes)
956 {
957 uint16_t tt_buff_len = tt_len(tt_num_changes);
958
959 /* Replace the old buffer only if I received something in the
960 * last OGM (the OGM could carry no changes) */
961 spin_lock_bh(&orig_node->tt_buff_lock);
962 if (tt_buff_len > 0) {
963 kfree(orig_node->tt_buff);
964 orig_node->tt_buff_len = 0;
965 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
966 if (orig_node->tt_buff) {
967 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
968 orig_node->tt_buff_len = tt_buff_len;
969 }
970 }
971 spin_unlock_bh(&orig_node->tt_buff_lock);
972 }
973
974 static void tt_req_purge(struct bat_priv *bat_priv)
975 {
976 struct tt_req_node *node, *safe;
977
978 spin_lock_bh(&bat_priv->tt_req_list_lock);
979 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
980 if (is_out_of_time(node->issued_at,
981 TT_REQUEST_TIMEOUT * 1000)) {
982 list_del(&node->list);
983 kfree(node);
984 }
985 }
986 spin_unlock_bh(&bat_priv->tt_req_list_lock);
987 }
988
989 /* returns the pointer to the new tt_req_node struct if no request
990 * has already been issued for this orig_node, NULL otherwise */
991 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
992 struct orig_node *orig_node)
993 {
994 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
995
996 spin_lock_bh(&bat_priv->tt_req_list_lock);
997 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
998 if (compare_eth(tt_req_node_tmp, orig_node) &&
999 !is_out_of_time(tt_req_node_tmp->issued_at,
1000 TT_REQUEST_TIMEOUT * 1000))
1001 goto unlock;
1002 }
1003
1004 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1005 if (!tt_req_node)
1006 goto unlock;
1007
1008 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1009 tt_req_node->issued_at = jiffies;
1010
1011 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
1012 unlock:
1013 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1014 return tt_req_node;
1015 }
1016
1017 /* data_ptr is useless here, but has to be kept to respect the prototype */
1018 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1019 {
1020 const struct tt_common_entry *tt_common_entry = entry_ptr;
1021
1022 if (tt_common_entry->flags & TT_CLIENT_NEW)
1023 return 0;
1024 return 1;
1025 }
1026
1027 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1028 {
1029 const struct tt_common_entry *tt_common_entry = entry_ptr;
1030 const struct tt_global_entry *tt_global_entry;
1031 const struct orig_node *orig_node = data_ptr;
1032
1033 if (tt_common_entry->flags & TT_CLIENT_ROAM)
1034 return 0;
1035
1036 tt_global_entry = container_of(tt_common_entry, struct tt_global_entry,
1037 common);
1038
1039 return (tt_global_entry->orig_node == orig_node);
1040 }
1041
1042 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1043 struct hashtable_t *hash,
1044 struct hard_iface *primary_if,
1045 int (*valid_cb)(const void *,
1046 const void *),
1047 void *cb_data)
1048 {
1049 struct tt_common_entry *tt_common_entry;
1050 struct tt_query_packet *tt_response;
1051 struct tt_change *tt_change;
1052 struct hlist_node *node;
1053 struct hlist_head *head;
1054 struct sk_buff *skb = NULL;
1055 uint16_t tt_tot, tt_count;
1056 ssize_t tt_query_size = sizeof(struct tt_query_packet);
1057 uint32_t i;
1058
1059 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1060 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1061 tt_len -= tt_len % sizeof(struct tt_change);
1062 }
1063 tt_tot = tt_len / sizeof(struct tt_change);
1064
1065 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1066 if (!skb)
1067 goto out;
1068
1069 skb_reserve(skb, ETH_HLEN);
1070 tt_response = (struct tt_query_packet *)skb_put(skb,
1071 tt_query_size + tt_len);
1072 tt_response->ttvn = ttvn;
1073
1074 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1075 tt_count = 0;
1076
1077 rcu_read_lock();
1078 for (i = 0; i < hash->size; i++) {
1079 head = &hash->table[i];
1080
1081 hlist_for_each_entry_rcu(tt_common_entry, node,
1082 head, hash_entry) {
1083 if (tt_count == tt_tot)
1084 break;
1085
1086 if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
1087 continue;
1088
1089 memcpy(tt_change->addr, tt_common_entry->addr,
1090 ETH_ALEN);
1091 tt_change->flags = NO_FLAGS;
1092
1093 tt_count++;
1094 tt_change++;
1095 }
1096 }
1097 rcu_read_unlock();
1098
1099 /* store in the message the number of entries we have successfully
1100 * copied */
1101 tt_response->tt_data = htons(tt_count);
1102
1103 out:
1104 return skb;
1105 }
1106
1107 static int send_tt_request(struct bat_priv *bat_priv,
1108 struct orig_node *dst_orig_node,
1109 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1110 {
1111 struct sk_buff *skb = NULL;
1112 struct tt_query_packet *tt_request;
1113 struct neigh_node *neigh_node = NULL;
1114 struct hard_iface *primary_if;
1115 struct tt_req_node *tt_req_node = NULL;
1116 int ret = 1;
1117
1118 primary_if = primary_if_get_selected(bat_priv);
1119 if (!primary_if)
1120 goto out;
1121
1122 /* The new tt_req will be issued only if I'm not waiting for a
1123 * reply from the same orig_node yet */
1124 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1125 if (!tt_req_node)
1126 goto out;
1127
1128 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1129 if (!skb)
1130 goto out;
1131
1132 skb_reserve(skb, ETH_HLEN);
1133
1134 tt_request = (struct tt_query_packet *)skb_put(skb,
1135 sizeof(struct tt_query_packet));
1136
1137 tt_request->packet_type = BAT_TT_QUERY;
1138 tt_request->version = COMPAT_VERSION;
1139 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1140 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1141 tt_request->ttl = TTL;
1142 tt_request->ttvn = ttvn;
1143 tt_request->tt_data = tt_crc;
1144 tt_request->flags = TT_REQUEST;
1145
1146 if (full_table)
1147 tt_request->flags |= TT_FULL_TABLE;
1148
1149 neigh_node = orig_node_get_router(dst_orig_node);
1150 if (!neigh_node)
1151 goto out;
1152
1153 bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1154 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1155 (full_table ? 'F' : '.'));
1156
1157 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1158 ret = 0;
1159
1160 out:
1161 if (neigh_node)
1162 neigh_node_free_ref(neigh_node);
1163 if (primary_if)
1164 hardif_free_ref(primary_if);
1165 if (ret)
1166 kfree_skb(skb);
1167 if (ret && tt_req_node) {
1168 spin_lock_bh(&bat_priv->tt_req_list_lock);
1169 list_del(&tt_req_node->list);
1170 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1171 kfree(tt_req_node);
1172 }
1173 return ret;
1174 }
1175
1176 static bool send_other_tt_response(struct bat_priv *bat_priv,
1177 struct tt_query_packet *tt_request)
1178 {
1179 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1180 struct neigh_node *neigh_node = NULL;
1181 struct hard_iface *primary_if = NULL;
1182 uint8_t orig_ttvn, req_ttvn, ttvn;
1183 int ret = false;
1184 unsigned char *tt_buff;
1185 bool full_table;
1186 uint16_t tt_len, tt_tot;
1187 struct sk_buff *skb = NULL;
1188 struct tt_query_packet *tt_response;
1189
1190 bat_dbg(DBG_TT, bat_priv,
1191 "Received TT_REQUEST from %pM for "
1192 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1193 tt_request->ttvn, tt_request->dst,
1194 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1195
1196 /* Let's get the orig node of the REAL destination */
1197 req_dst_orig_node = orig_hash_find(bat_priv, tt_request->dst);
1198 if (!req_dst_orig_node)
1199 goto out;
1200
1201 res_dst_orig_node = orig_hash_find(bat_priv, tt_request->src);
1202 if (!res_dst_orig_node)
1203 goto out;
1204
1205 neigh_node = orig_node_get_router(res_dst_orig_node);
1206 if (!neigh_node)
1207 goto out;
1208
1209 primary_if = primary_if_get_selected(bat_priv);
1210 if (!primary_if)
1211 goto out;
1212
1213 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1214 req_ttvn = tt_request->ttvn;
1215
1216 /* I don't have the requested data */
1217 if (orig_ttvn != req_ttvn ||
1218 tt_request->tt_data != req_dst_orig_node->tt_crc)
1219 goto out;
1220
1221 /* If the full table has been explicitly requested */
1222 if (tt_request->flags & TT_FULL_TABLE ||
1223 !req_dst_orig_node->tt_buff)
1224 full_table = true;
1225 else
1226 full_table = false;
1227
1228 /* In this version, fragmentation is not implemented, then
1229 * I'll send only one packet with as much TT entries as I can */
1230 if (!full_table) {
1231 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1232 tt_len = req_dst_orig_node->tt_buff_len;
1233 tt_tot = tt_len / sizeof(struct tt_change);
1234
1235 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1236 tt_len + ETH_HLEN);
1237 if (!skb)
1238 goto unlock;
1239
1240 skb_reserve(skb, ETH_HLEN);
1241 tt_response = (struct tt_query_packet *)skb_put(skb,
1242 sizeof(struct tt_query_packet) + tt_len);
1243 tt_response->ttvn = req_ttvn;
1244 tt_response->tt_data = htons(tt_tot);
1245
1246 tt_buff = skb->data + sizeof(struct tt_query_packet);
1247 /* Copy the last orig_node's OGM buffer */
1248 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1249 req_dst_orig_node->tt_buff_len);
1250
1251 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1252 } else {
1253 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1254 sizeof(struct tt_change);
1255 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1256
1257 skb = tt_response_fill_table(tt_len, ttvn,
1258 bat_priv->tt_global_hash,
1259 primary_if, tt_global_valid_entry,
1260 req_dst_orig_node);
1261 if (!skb)
1262 goto out;
1263
1264 tt_response = (struct tt_query_packet *)skb->data;
1265 }
1266
1267 tt_response->packet_type = BAT_TT_QUERY;
1268 tt_response->version = COMPAT_VERSION;
1269 tt_response->ttl = TTL;
1270 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1271 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1272 tt_response->flags = TT_RESPONSE;
1273
1274 if (full_table)
1275 tt_response->flags |= TT_FULL_TABLE;
1276
1277 bat_dbg(DBG_TT, bat_priv,
1278 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1279 res_dst_orig_node->orig, neigh_node->addr,
1280 req_dst_orig_node->orig, req_ttvn);
1281
1282 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1283 ret = true;
1284 goto out;
1285
1286 unlock:
1287 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1288
1289 out:
1290 if (res_dst_orig_node)
1291 orig_node_free_ref(res_dst_orig_node);
1292 if (req_dst_orig_node)
1293 orig_node_free_ref(req_dst_orig_node);
1294 if (neigh_node)
1295 neigh_node_free_ref(neigh_node);
1296 if (primary_if)
1297 hardif_free_ref(primary_if);
1298 if (!ret)
1299 kfree_skb(skb);
1300 return ret;
1301
1302 }
1303 static bool send_my_tt_response(struct bat_priv *bat_priv,
1304 struct tt_query_packet *tt_request)
1305 {
1306 struct orig_node *orig_node = NULL;
1307 struct neigh_node *neigh_node = NULL;
1308 struct hard_iface *primary_if = NULL;
1309 uint8_t my_ttvn, req_ttvn, ttvn;
1310 int ret = false;
1311 unsigned char *tt_buff;
1312 bool full_table;
1313 uint16_t tt_len, tt_tot;
1314 struct sk_buff *skb = NULL;
1315 struct tt_query_packet *tt_response;
1316
1317 bat_dbg(DBG_TT, bat_priv,
1318 "Received TT_REQUEST from %pM for "
1319 "ttvn: %u (me) [%c]\n", tt_request->src,
1320 tt_request->ttvn,
1321 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1322
1323
1324 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1325 req_ttvn = tt_request->ttvn;
1326
1327 orig_node = orig_hash_find(bat_priv, tt_request->src);
1328 if (!orig_node)
1329 goto out;
1330
1331 neigh_node = orig_node_get_router(orig_node);
1332 if (!neigh_node)
1333 goto out;
1334
1335 primary_if = primary_if_get_selected(bat_priv);
1336 if (!primary_if)
1337 goto out;
1338
1339 /* If the full table has been explicitly requested or the gap
1340 * is too big send the whole local translation table */
1341 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1342 !bat_priv->tt_buff)
1343 full_table = true;
1344 else
1345 full_table = false;
1346
1347 /* In this version, fragmentation is not implemented, then
1348 * I'll send only one packet with as much TT entries as I can */
1349 if (!full_table) {
1350 spin_lock_bh(&bat_priv->tt_buff_lock);
1351 tt_len = bat_priv->tt_buff_len;
1352 tt_tot = tt_len / sizeof(struct tt_change);
1353
1354 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1355 tt_len + ETH_HLEN);
1356 if (!skb)
1357 goto unlock;
1358
1359 skb_reserve(skb, ETH_HLEN);
1360 tt_response = (struct tt_query_packet *)skb_put(skb,
1361 sizeof(struct tt_query_packet) + tt_len);
1362 tt_response->ttvn = req_ttvn;
1363 tt_response->tt_data = htons(tt_tot);
1364
1365 tt_buff = skb->data + sizeof(struct tt_query_packet);
1366 memcpy(tt_buff, bat_priv->tt_buff,
1367 bat_priv->tt_buff_len);
1368 spin_unlock_bh(&bat_priv->tt_buff_lock);
1369 } else {
1370 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1371 sizeof(struct tt_change);
1372 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1373
1374 skb = tt_response_fill_table(tt_len, ttvn,
1375 bat_priv->tt_local_hash,
1376 primary_if, tt_local_valid_entry,
1377 NULL);
1378 if (!skb)
1379 goto out;
1380
1381 tt_response = (struct tt_query_packet *)skb->data;
1382 }
1383
1384 tt_response->packet_type = BAT_TT_QUERY;
1385 tt_response->version = COMPAT_VERSION;
1386 tt_response->ttl = TTL;
1387 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1388 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1389 tt_response->flags = TT_RESPONSE;
1390
1391 if (full_table)
1392 tt_response->flags |= TT_FULL_TABLE;
1393
1394 bat_dbg(DBG_TT, bat_priv,
1395 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1396 orig_node->orig, neigh_node->addr,
1397 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1398
1399 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1400 ret = true;
1401 goto out;
1402
1403 unlock:
1404 spin_unlock_bh(&bat_priv->tt_buff_lock);
1405 out:
1406 if (orig_node)
1407 orig_node_free_ref(orig_node);
1408 if (neigh_node)
1409 neigh_node_free_ref(neigh_node);
1410 if (primary_if)
1411 hardif_free_ref(primary_if);
1412 if (!ret)
1413 kfree_skb(skb);
1414 /* This packet was for me, so it doesn't need to be re-routed */
1415 return true;
1416 }
1417
1418 bool send_tt_response(struct bat_priv *bat_priv,
1419 struct tt_query_packet *tt_request)
1420 {
1421 if (is_my_mac(tt_request->dst))
1422 return send_my_tt_response(bat_priv, tt_request);
1423 else
1424 return send_other_tt_response(bat_priv, tt_request);
1425 }
1426
1427 static void _tt_update_changes(struct bat_priv *bat_priv,
1428 struct orig_node *orig_node,
1429 struct tt_change *tt_change,
1430 uint16_t tt_num_changes, uint8_t ttvn)
1431 {
1432 int i;
1433
1434 for (i = 0; i < tt_num_changes; i++) {
1435 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1436 tt_global_del(bat_priv, orig_node,
1437 (tt_change + i)->addr,
1438 "tt removed by changes",
1439 (tt_change + i)->flags & TT_CLIENT_ROAM);
1440 else
1441 if (!tt_global_add(bat_priv, orig_node,
1442 (tt_change + i)->addr, ttvn, false,
1443 (tt_change + i)->flags &
1444 TT_CLIENT_WIFI))
1445 /* In case of problem while storing a
1446 * global_entry, we stop the updating
1447 * procedure without committing the
1448 * ttvn change. This will avoid to send
1449 * corrupted data on tt_request
1450 */
1451 return;
1452 }
1453 }
1454
1455 static void tt_fill_gtable(struct bat_priv *bat_priv,
1456 struct tt_query_packet *tt_response)
1457 {
1458 struct orig_node *orig_node = NULL;
1459
1460 orig_node = orig_hash_find(bat_priv, tt_response->src);
1461 if (!orig_node)
1462 goto out;
1463
1464 /* Purge the old table first.. */
1465 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1466
1467 _tt_update_changes(bat_priv, orig_node,
1468 (struct tt_change *)(tt_response + 1),
1469 tt_response->tt_data, tt_response->ttvn);
1470
1471 spin_lock_bh(&orig_node->tt_buff_lock);
1472 kfree(orig_node->tt_buff);
1473 orig_node->tt_buff_len = 0;
1474 orig_node->tt_buff = NULL;
1475 spin_unlock_bh(&orig_node->tt_buff_lock);
1476
1477 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1478
1479 out:
1480 if (orig_node)
1481 orig_node_free_ref(orig_node);
1482 }
1483
1484 static void tt_update_changes(struct bat_priv *bat_priv,
1485 struct orig_node *orig_node,
1486 uint16_t tt_num_changes, uint8_t ttvn,
1487 struct tt_change *tt_change)
1488 {
1489 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1490 ttvn);
1491
1492 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1493 tt_num_changes);
1494 atomic_set(&orig_node->last_ttvn, ttvn);
1495 }
1496
1497 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1498 {
1499 struct tt_local_entry *tt_local_entry = NULL;
1500 bool ret = false;
1501
1502 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1503 if (!tt_local_entry)
1504 goto out;
1505 /* Check if the client has been logically deleted (but is kept for
1506 * consistency purpose) */
1507 if (tt_local_entry->common.flags & TT_CLIENT_PENDING)
1508 goto out;
1509 ret = true;
1510 out:
1511 if (tt_local_entry)
1512 tt_local_entry_free_ref(tt_local_entry);
1513 return ret;
1514 }
1515
1516 void handle_tt_response(struct bat_priv *bat_priv,
1517 struct tt_query_packet *tt_response)
1518 {
1519 struct tt_req_node *node, *safe;
1520 struct orig_node *orig_node = NULL;
1521
1522 bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1523 "ttvn %d t_size: %d [%c]\n",
1524 tt_response->src, tt_response->ttvn,
1525 tt_response->tt_data,
1526 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1527
1528 orig_node = orig_hash_find(bat_priv, tt_response->src);
1529 if (!orig_node)
1530 goto out;
1531
1532 if (tt_response->flags & TT_FULL_TABLE)
1533 tt_fill_gtable(bat_priv, tt_response);
1534 else
1535 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1536 tt_response->ttvn,
1537 (struct tt_change *)(tt_response + 1));
1538
1539 /* Delete the tt_req_node from pending tt_requests list */
1540 spin_lock_bh(&bat_priv->tt_req_list_lock);
1541 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1542 if (!compare_eth(node->addr, tt_response->src))
1543 continue;
1544 list_del(&node->list);
1545 kfree(node);
1546 }
1547 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1548
1549 /* Recalculate the CRC for this orig_node and store it */
1550 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1551 /* Roaming phase is over: tables are in sync again. I can
1552 * unset the flag */
1553 orig_node->tt_poss_change = false;
1554 out:
1555 if (orig_node)
1556 orig_node_free_ref(orig_node);
1557 }
1558
1559 int tt_init(struct bat_priv *bat_priv)
1560 {
1561 if (!tt_local_init(bat_priv))
1562 return 0;
1563
1564 if (!tt_global_init(bat_priv))
1565 return 0;
1566
1567 tt_start_timer(bat_priv);
1568
1569 return 1;
1570 }
1571
1572 static void tt_roam_list_free(struct bat_priv *bat_priv)
1573 {
1574 struct tt_roam_node *node, *safe;
1575
1576 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1577
1578 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1579 list_del(&node->list);
1580 kfree(node);
1581 }
1582
1583 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1584 }
1585
1586 static void tt_roam_purge(struct bat_priv *bat_priv)
1587 {
1588 struct tt_roam_node *node, *safe;
1589
1590 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1591 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1592 if (!is_out_of_time(node->first_time,
1593 ROAMING_MAX_TIME * 1000))
1594 continue;
1595
1596 list_del(&node->list);
1597 kfree(node);
1598 }
1599 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1600 }
1601
1602 /* This function checks whether the client already reached the
1603 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1604 * will not be sent.
1605 *
1606 * returns true if the ROAMING_ADV can be sent, false otherwise */
1607 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1608 uint8_t *client)
1609 {
1610 struct tt_roam_node *tt_roam_node;
1611 bool ret = false;
1612
1613 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1614 /* The new tt_req will be issued only if I'm not waiting for a
1615 * reply from the same orig_node yet */
1616 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1617 if (!compare_eth(tt_roam_node->addr, client))
1618 continue;
1619
1620 if (is_out_of_time(tt_roam_node->first_time,
1621 ROAMING_MAX_TIME * 1000))
1622 continue;
1623
1624 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1625 /* Sorry, you roamed too many times! */
1626 goto unlock;
1627 ret = true;
1628 break;
1629 }
1630
1631 if (!ret) {
1632 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1633 if (!tt_roam_node)
1634 goto unlock;
1635
1636 tt_roam_node->first_time = jiffies;
1637 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1638 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1639
1640 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1641 ret = true;
1642 }
1643
1644 unlock:
1645 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1646 return ret;
1647 }
1648
1649 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1650 struct orig_node *orig_node)
1651 {
1652 struct neigh_node *neigh_node = NULL;
1653 struct sk_buff *skb = NULL;
1654 struct roam_adv_packet *roam_adv_packet;
1655 int ret = 1;
1656 struct hard_iface *primary_if;
1657
1658 /* before going on we have to check whether the client has
1659 * already roamed to us too many times */
1660 if (!tt_check_roam_count(bat_priv, client))
1661 goto out;
1662
1663 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1664 if (!skb)
1665 goto out;
1666
1667 skb_reserve(skb, ETH_HLEN);
1668
1669 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1670 sizeof(struct roam_adv_packet));
1671
1672 roam_adv_packet->packet_type = BAT_ROAM_ADV;
1673 roam_adv_packet->version = COMPAT_VERSION;
1674 roam_adv_packet->ttl = TTL;
1675 primary_if = primary_if_get_selected(bat_priv);
1676 if (!primary_if)
1677 goto out;
1678 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1679 hardif_free_ref(primary_if);
1680 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1681 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1682
1683 neigh_node = orig_node_get_router(orig_node);
1684 if (!neigh_node)
1685 goto out;
1686
1687 bat_dbg(DBG_TT, bat_priv,
1688 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1689 orig_node->orig, client, neigh_node->addr);
1690
1691 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1692 ret = 0;
1693
1694 out:
1695 if (neigh_node)
1696 neigh_node_free_ref(neigh_node);
1697 if (ret)
1698 kfree_skb(skb);
1699 return;
1700 }
1701
1702 static void tt_purge(struct work_struct *work)
1703 {
1704 struct delayed_work *delayed_work =
1705 container_of(work, struct delayed_work, work);
1706 struct bat_priv *bat_priv =
1707 container_of(delayed_work, struct bat_priv, tt_work);
1708
1709 tt_local_purge(bat_priv);
1710 tt_global_roam_purge(bat_priv);
1711 tt_req_purge(bat_priv);
1712 tt_roam_purge(bat_priv);
1713
1714 tt_start_timer(bat_priv);
1715 }
1716
1717 void tt_free(struct bat_priv *bat_priv)
1718 {
1719 cancel_delayed_work_sync(&bat_priv->tt_work);
1720
1721 tt_local_table_free(bat_priv);
1722 tt_global_table_free(bat_priv);
1723 tt_req_list_free(bat_priv);
1724 tt_changes_list_free(bat_priv);
1725 tt_roam_list_free(bat_priv);
1726
1727 kfree(bat_priv->tt_buff);
1728 }
1729
1730 /* This function will enable or disable the specified flags for all the entries
1731 * in the given hash table and returns the number of modified entries */
1732 static uint16_t tt_set_flags(struct hashtable_t *hash, uint16_t flags,
1733 bool enable)
1734 {
1735 uint32_t i;
1736 uint16_t changed_num = 0;
1737 struct hlist_head *head;
1738 struct hlist_node *node;
1739 struct tt_common_entry *tt_common_entry;
1740
1741 if (!hash)
1742 goto out;
1743
1744 for (i = 0; i < hash->size; i++) {
1745 head = &hash->table[i];
1746
1747 rcu_read_lock();
1748 hlist_for_each_entry_rcu(tt_common_entry, node,
1749 head, hash_entry) {
1750 if (enable) {
1751 if ((tt_common_entry->flags & flags) == flags)
1752 continue;
1753 tt_common_entry->flags |= flags;
1754 } else {
1755 if (!(tt_common_entry->flags & flags))
1756 continue;
1757 tt_common_entry->flags &= ~flags;
1758 }
1759 changed_num++;
1760 }
1761 rcu_read_unlock();
1762 }
1763 out:
1764 return changed_num;
1765 }
1766
1767 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1768 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1769 {
1770 struct hashtable_t *hash = bat_priv->tt_local_hash;
1771 struct tt_common_entry *tt_common_entry;
1772 struct tt_local_entry *tt_local_entry;
1773 struct hlist_node *node, *node_tmp;
1774 struct hlist_head *head;
1775 spinlock_t *list_lock; /* protects write access to the hash lists */
1776 uint32_t i;
1777
1778 if (!hash)
1779 return;
1780
1781 for (i = 0; i < hash->size; i++) {
1782 head = &hash->table[i];
1783 list_lock = &hash->list_locks[i];
1784
1785 spin_lock_bh(list_lock);
1786 hlist_for_each_entry_safe(tt_common_entry, node, node_tmp,
1787 head, hash_entry) {
1788 if (!(tt_common_entry->flags & TT_CLIENT_PENDING))
1789 continue;
1790
1791 bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1792 "(%pM): pending\n", tt_common_entry->addr);
1793
1794 atomic_dec(&bat_priv->num_local_tt);
1795 hlist_del_rcu(node);
1796 tt_local_entry = container_of(tt_common_entry,
1797 struct tt_local_entry,
1798 common);
1799 tt_local_entry_free_ref(tt_local_entry);
1800 }
1801 spin_unlock_bh(list_lock);
1802 }
1803
1804 }
1805
1806 void tt_commit_changes(struct bat_priv *bat_priv)
1807 {
1808 uint16_t changed_num = tt_set_flags(bat_priv->tt_local_hash,
1809 TT_CLIENT_NEW, false);
1810 /* all the reset entries have now to be effectively counted as local
1811 * entries */
1812 atomic_add(changed_num, &bat_priv->num_local_tt);
1813 tt_local_purge_pending_clients(bat_priv);
1814
1815 /* Increment the TTVN only once per OGM interval */
1816 atomic_inc(&bat_priv->ttvn);
1817 bat_priv->tt_poss_change = false;
1818 }
1819
1820 bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
1821 {
1822 struct tt_local_entry *tt_local_entry = NULL;
1823 struct tt_global_entry *tt_global_entry = NULL;
1824 bool ret = true;
1825
1826 if (!atomic_read(&bat_priv->ap_isolation))
1827 return false;
1828
1829 tt_local_entry = tt_local_hash_find(bat_priv, dst);
1830 if (!tt_local_entry)
1831 goto out;
1832
1833 tt_global_entry = tt_global_hash_find(bat_priv, src);
1834 if (!tt_global_entry)
1835 goto out;
1836
1837 if (_is_ap_isolated(tt_local_entry, tt_global_entry))
1838 goto out;
1839
1840 ret = false;
1841
1842 out:
1843 if (tt_global_entry)
1844 tt_global_entry_free_ref(tt_global_entry);
1845 if (tt_local_entry)
1846 tt_local_entry_free_ref(tt_local_entry);
1847 return ret;
1848 }
1849
1850 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
1851 const unsigned char *tt_buff, uint8_t tt_num_changes,
1852 uint8_t ttvn, uint16_t tt_crc)
1853 {
1854 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
1855 bool full_table = true;
1856
1857 /* the ttvn increased by one -> we can apply the attached changes */
1858 if (ttvn - orig_ttvn == 1) {
1859 /* the OGM could not contain the changes due to their size or
1860 * because they have already been sent TT_OGM_APPEND_MAX times.
1861 * In this case send a tt request */
1862 if (!tt_num_changes) {
1863 full_table = false;
1864 goto request_table;
1865 }
1866
1867 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
1868 (struct tt_change *)tt_buff);
1869
1870 /* Even if we received the precomputed crc with the OGM, we
1871 * prefer to recompute it to spot any possible inconsistency
1872 * in the global table */
1873 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1874
1875 /* The ttvn alone is not enough to guarantee consistency
1876 * because a single value could represent different states
1877 * (due to the wrap around). Thus a node has to check whether
1878 * the resulting table (after applying the changes) is still
1879 * consistent or not. E.g. a node could disconnect while its
1880 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
1881 * checking the CRC value is mandatory to detect the
1882 * inconsistency */
1883 if (orig_node->tt_crc != tt_crc)
1884 goto request_table;
1885
1886 /* Roaming phase is over: tables are in sync again. I can
1887 * unset the flag */
1888 orig_node->tt_poss_change = false;
1889 } else {
1890 /* if we missed more than one change or our tables are not
1891 * in sync anymore -> request fresh tt data */
1892 if (ttvn != orig_ttvn || orig_node->tt_crc != tt_crc) {
1893 request_table:
1894 bat_dbg(DBG_TT, bat_priv, "TT inconsistency for %pM. "
1895 "Need to retrieve the correct information "
1896 "(ttvn: %u last_ttvn: %u crc: %u last_crc: "
1897 "%u num_changes: %u)\n", orig_node->orig, ttvn,
1898 orig_ttvn, tt_crc, orig_node->tt_crc,
1899 tt_num_changes);
1900 send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
1901 full_table);
1902 return;
1903 }
1904 }
1905 }