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MIPS: Yosemite, Emma: Fix off-by-two in arcs_cmdline buffer size check
[linux-2.6/linux-mips.git] / net / batman-adv / translation-table.c
blobc7aafc7c5ed4854b2a46f6e37b5386ef937fee8e
1 /*
2 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
3 *
4 * Marek Lindner, Simon Wunderlich
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22 #include "main.h"
23 #include "translation-table.h"
24 #include "soft-interface.h"
25 #include "hard-interface.h"
26 #include "send.h"
27 #include "hash.h"
28 #include "originator.h"
29 #include "routing.h"
30
31 #include <linux/crc16.h>
32
33 static void _tt_global_del(struct bat_priv *bat_priv,
34 struct tt_global_entry *tt_global_entry,
35 const char *message);
36 static void tt_purge(struct work_struct *work);
37
38 /* returns 1 if they are the same mac addr */
39 static int compare_ltt(const struct hlist_node *node, const void *data2)
40 {
41 const void *data1 = container_of(node, struct tt_local_entry,
42 hash_entry);
43
44 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
45 }
46
47 /* returns 1 if they are the same mac addr */
48 static int compare_gtt(const struct hlist_node *node, const void *data2)
49 {
50 const void *data1 = container_of(node, struct tt_global_entry,
51 hash_entry);
52
53 return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
54 }
55
56 static void tt_start_timer(struct bat_priv *bat_priv)
57 {
58 INIT_DELAYED_WORK(&bat_priv->tt_work, tt_purge);
59 queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work,
60 msecs_to_jiffies(5000));
61 }
62
63 static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
64 const void *data)
65 {
66 struct hashtable_t *hash = bat_priv->tt_local_hash;
67 struct hlist_head *head;
68 struct hlist_node *node;
69 struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL;
70 int index;
71
72 if (!hash)
73 return NULL;
74
75 index = choose_orig(data, hash->size);
76 head = &hash->table[index];
77
78 rcu_read_lock();
79 hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) {
80 if (!compare_eth(tt_local_entry, data))
81 continue;
82
83 if (!atomic_inc_not_zero(&tt_local_entry->refcount))
84 continue;
85
86 tt_local_entry_tmp = tt_local_entry;
87 break;
88 }
89 rcu_read_unlock();
90
91 return tt_local_entry_tmp;
92 }
93
94 static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
95 const void *data)
96 {
97 struct hashtable_t *hash = bat_priv->tt_global_hash;
98 struct hlist_head *head;
99 struct hlist_node *node;
100 struct tt_global_entry *tt_global_entry;
101 struct tt_global_entry *tt_global_entry_tmp = NULL;
102 int index;
103
104 if (!hash)
105 return NULL;
106
107 index = choose_orig(data, hash->size);
108 head = &hash->table[index];
109
110 rcu_read_lock();
111 hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) {
112 if (!compare_eth(tt_global_entry, data))
113 continue;
114
115 if (!atomic_inc_not_zero(&tt_global_entry->refcount))
116 continue;
117
118 tt_global_entry_tmp = tt_global_entry;
119 break;
120 }
121 rcu_read_unlock();
122
123 return tt_global_entry_tmp;
124 }
125
126 static bool is_out_of_time(unsigned long starting_time, unsigned long timeout)
127 {
128 unsigned long deadline;
129 deadline = starting_time + msecs_to_jiffies(timeout);
130
131 return time_after(jiffies, deadline);
132 }
133
134 static void tt_local_entry_free_ref(struct tt_local_entry *tt_local_entry)
135 {
136 if (atomic_dec_and_test(&tt_local_entry->refcount))
137 kfree_rcu(tt_local_entry, rcu);
138 }
139
140 static void tt_global_entry_free_rcu(struct rcu_head *rcu)
141 {
142 struct tt_global_entry *tt_global_entry;
143
144 tt_global_entry = container_of(rcu, struct tt_global_entry, rcu);
145
146 if (tt_global_entry->orig_node)
147 orig_node_free_ref(tt_global_entry->orig_node);
148
149 kfree(tt_global_entry);
150 }
151
152 static void tt_global_entry_free_ref(struct tt_global_entry *tt_global_entry)
153 {
154 if (atomic_dec_and_test(&tt_global_entry->refcount))
155 call_rcu(&tt_global_entry->rcu, tt_global_entry_free_rcu);
156 }
157
158 static void tt_local_event(struct bat_priv *bat_priv, const uint8_t *addr,
159 uint8_t flags)
160 {
161 struct tt_change_node *tt_change_node;
162
163 tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
164
165 if (!tt_change_node)
166 return;
167
168 tt_change_node->change.flags = flags;
169 memcpy(tt_change_node->change.addr, addr, ETH_ALEN);
170
171 spin_lock_bh(&bat_priv->tt_changes_list_lock);
172 /* track the change in the OGMinterval list */
173 list_add_tail(&tt_change_node->list, &bat_priv->tt_changes_list);
174 atomic_inc(&bat_priv->tt_local_changes);
175 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
176
177 atomic_set(&bat_priv->tt_ogm_append_cnt, 0);
178 }
179
180 int tt_len(int changes_num)
181 {
182 return changes_num * sizeof(struct tt_change);
183 }
184
185 static int tt_local_init(struct bat_priv *bat_priv)
186 {
187 if (bat_priv->tt_local_hash)
188 return 1;
189
190 bat_priv->tt_local_hash = hash_new(1024);
191
192 if (!bat_priv->tt_local_hash)
193 return 0;
194
195 return 1;
196 }
197
198 void tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
199 int ifindex)
200 {
201 struct bat_priv *bat_priv = netdev_priv(soft_iface);
202 struct tt_local_entry *tt_local_entry = NULL;
203 struct tt_global_entry *tt_global_entry = NULL;
204
205 tt_local_entry = tt_local_hash_find(bat_priv, addr);
206
207 if (tt_local_entry) {
208 tt_local_entry->last_seen = jiffies;
209 goto out;
210 }
211
212 tt_local_entry = kmalloc(sizeof(*tt_local_entry), GFP_ATOMIC);
213 if (!tt_local_entry)
214 goto out;
215
216 bat_dbg(DBG_TT, bat_priv,
217 "Creating new local tt entry: %pM (ttvn: %d)\n", addr,
218 (uint8_t)atomic_read(&bat_priv->ttvn));
219
220 memcpy(tt_local_entry->addr, addr, ETH_ALEN);
221 tt_local_entry->last_seen = jiffies;
222 tt_local_entry->flags = NO_FLAGS;
223 if (is_wifi_iface(ifindex))
224 tt_local_entry->flags |= TT_CLIENT_WIFI;
225 atomic_set(&tt_local_entry->refcount, 2);
226
227 /* the batman interface mac address should never be purged */
228 if (compare_eth(addr, soft_iface->dev_addr))
229 tt_local_entry->flags |= TT_CLIENT_NOPURGE;
230
231 tt_local_event(bat_priv, addr, tt_local_entry->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->flags |= TT_CLIENT_NEW;
237
238 hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
239 tt_local_entry, &tt_local_entry->hash_entry);
240
241 /* remove address from global hash if present */
242 tt_global_entry = tt_global_hash_find(bat_priv, addr);
243
244 /* Check whether it is a roaming! */
245 if (tt_global_entry) {
246 /* This node is probably going to update its tt table */
247 tt_global_entry->orig_node->tt_poss_change = true;
248 /* The global entry has to be marked as PENDING and has to be
249 * kept for consistency purpose */
250 tt_global_entry->flags |= TT_CLIENT_PENDING;
251 send_roam_adv(bat_priv, tt_global_entry->addr,
252 tt_global_entry->orig_node);
253 }
254 out:
255 if (tt_local_entry)
256 tt_local_entry_free_ref(tt_local_entry);
257 if (tt_global_entry)
258 tt_global_entry_free_ref(tt_global_entry);
259 }
260
261 int tt_changes_fill_buffer(struct bat_priv *bat_priv,
262 unsigned char *buff, int buff_len)
263 {
264 int count = 0, tot_changes = 0;
265 struct tt_change_node *entry, *safe;
266
267 if (buff_len > 0)
268 tot_changes = buff_len / tt_len(1);
269
270 spin_lock_bh(&bat_priv->tt_changes_list_lock);
271 atomic_set(&bat_priv->tt_local_changes, 0);
272
273 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
274 list) {
275 if (count < tot_changes) {
276 memcpy(buff + tt_len(count),
277 &entry->change, sizeof(struct tt_change));
278 count++;
279 }
280 list_del(&entry->list);
281 kfree(entry);
282 }
283 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
284
285 /* Keep the buffer for possible tt_request */
286 spin_lock_bh(&bat_priv->tt_buff_lock);
287 kfree(bat_priv->tt_buff);
288 bat_priv->tt_buff_len = 0;
289 bat_priv->tt_buff = NULL;
290 /* We check whether this new OGM has no changes due to size
291 * problems */
292 if (buff_len > 0) {
293 /**
294 * if kmalloc() fails we will reply with the full table
295 * instead of providing the diff
296 */
297 bat_priv->tt_buff = kmalloc(buff_len, GFP_ATOMIC);
298 if (bat_priv->tt_buff) {
299 memcpy(bat_priv->tt_buff, buff, buff_len);
300 bat_priv->tt_buff_len = buff_len;
301 }
302 }
303 spin_unlock_bh(&bat_priv->tt_buff_lock);
304
305 return tot_changes;
306 }
307
308 int tt_local_seq_print_text(struct seq_file *seq, void *offset)
309 {
310 struct net_device *net_dev = (struct net_device *)seq->private;
311 struct bat_priv *bat_priv = netdev_priv(net_dev);
312 struct hashtable_t *hash = bat_priv->tt_local_hash;
313 struct tt_local_entry *tt_local_entry;
314 struct hard_iface *primary_if;
315 struct hlist_node *node;
316 struct hlist_head *head;
317 size_t buf_size, pos;
318 char *buff;
319 int i, ret = 0;
320
321 primary_if = primary_if_get_selected(bat_priv);
322 if (!primary_if) {
323 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
324 "please specify interfaces to enable it\n",
325 net_dev->name);
326 goto out;
327 }
328
329 if (primary_if->if_status != IF_ACTIVE) {
330 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
331 "primary interface not active\n",
332 net_dev->name);
333 goto out;
334 }
335
336 seq_printf(seq, "Locally retrieved addresses (from %s) "
337 "announced via TT (TTVN: %u):\n",
338 net_dev->name, (uint8_t)atomic_read(&bat_priv->ttvn));
339
340 buf_size = 1;
341 /* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
342 for (i = 0; i < hash->size; i++) {
343 head = &hash->table[i];
344
345 rcu_read_lock();
346 __hlist_for_each_rcu(node, head)
347 buf_size += 29;
348 rcu_read_unlock();
349 }
350
351 buff = kmalloc(buf_size, GFP_ATOMIC);
352 if (!buff) {
353 ret = -ENOMEM;
354 goto out;
355 }
356
357 buff[0] = '\0';
358 pos = 0;
359
360 for (i = 0; i < hash->size; i++) {
361 head = &hash->table[i];
362
363 rcu_read_lock();
364 hlist_for_each_entry_rcu(tt_local_entry, node,
365 head, hash_entry) {
366 pos += snprintf(buff + pos, 30, " * %pM "
367 "[%c%c%c%c%c]\n",
368 tt_local_entry->addr,
369 (tt_local_entry->flags &
370 TT_CLIENT_ROAM ? 'R' : '.'),
371 (tt_local_entry->flags &
372 TT_CLIENT_NOPURGE ? 'P' : '.'),
373 (tt_local_entry->flags &
374 TT_CLIENT_NEW ? 'N' : '.'),
375 (tt_local_entry->flags &
376 TT_CLIENT_PENDING ? 'X' : '.'),
377 (tt_local_entry->flags &
378 TT_CLIENT_WIFI ? 'W' : '.'));
379 }
380 rcu_read_unlock();
381 }
382
383 seq_printf(seq, "%s", buff);
384 kfree(buff);
385 out:
386 if (primary_if)
387 hardif_free_ref(primary_if);
388 return ret;
389 }
390
391 static void tt_local_set_pending(struct bat_priv *bat_priv,
392 struct tt_local_entry *tt_local_entry,
393 uint16_t flags)
394 {
395 tt_local_event(bat_priv, tt_local_entry->addr,
396 tt_local_entry->flags | flags);
397
398 /* The local client has to be marked as "pending to be removed" but has
399 * to be kept in the table in order to send it in a full table
400 * response issued before the net ttvn increment (consistency check) */
401 tt_local_entry->flags |= TT_CLIENT_PENDING;
402 }
403
404 void tt_local_remove(struct bat_priv *bat_priv, const uint8_t *addr,
405 const char *message, bool roaming)
406 {
407 struct tt_local_entry *tt_local_entry = NULL;
408
409 tt_local_entry = tt_local_hash_find(bat_priv, addr);
410 if (!tt_local_entry)
411 goto out;
412
413 tt_local_set_pending(bat_priv, tt_local_entry, TT_CLIENT_DEL |
414 (roaming ? TT_CLIENT_ROAM : NO_FLAGS));
415
416 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) pending to be removed: "
417 "%s\n", tt_local_entry->addr, message);
418 out:
419 if (tt_local_entry)
420 tt_local_entry_free_ref(tt_local_entry);
421 }
422
423 static void tt_local_purge(struct bat_priv *bat_priv)
424 {
425 struct hashtable_t *hash = bat_priv->tt_local_hash;
426 struct tt_local_entry *tt_local_entry;
427 struct hlist_node *node, *node_tmp;
428 struct hlist_head *head;
429 spinlock_t *list_lock; /* protects write access to the hash lists */
430 int i;
431
432 for (i = 0; i < hash->size; i++) {
433 head = &hash->table[i];
434 list_lock = &hash->list_locks[i];
435
436 spin_lock_bh(list_lock);
437 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
438 head, hash_entry) {
439 if (tt_local_entry->flags & TT_CLIENT_NOPURGE)
440 continue;
441
442 /* entry already marked for deletion */
443 if (tt_local_entry->flags & TT_CLIENT_PENDING)
444 continue;
445
446 if (!is_out_of_time(tt_local_entry->last_seen,
447 TT_LOCAL_TIMEOUT * 1000))
448 continue;
449
450 tt_local_set_pending(bat_priv, tt_local_entry,
451 TT_CLIENT_DEL);
452 bat_dbg(DBG_TT, bat_priv, "Local tt entry (%pM) "
453 "pending to be removed: timed out\n",
454 tt_local_entry->addr);
455 }
456 spin_unlock_bh(list_lock);
457 }
458
459 }
460
461 static void tt_local_table_free(struct bat_priv *bat_priv)
462 {
463 struct hashtable_t *hash;
464 spinlock_t *list_lock; /* protects write access to the hash lists */
465 struct tt_local_entry *tt_local_entry;
466 struct hlist_node *node, *node_tmp;
467 struct hlist_head *head;
468 int i;
469
470 if (!bat_priv->tt_local_hash)
471 return;
472
473 hash = bat_priv->tt_local_hash;
474
475 for (i = 0; i < hash->size; i++) {
476 head = &hash->table[i];
477 list_lock = &hash->list_locks[i];
478
479 spin_lock_bh(list_lock);
480 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
481 head, hash_entry) {
482 hlist_del_rcu(node);
483 tt_local_entry_free_ref(tt_local_entry);
484 }
485 spin_unlock_bh(list_lock);
486 }
487
488 hash_destroy(hash);
489
490 bat_priv->tt_local_hash = NULL;
491 }
492
493 static int tt_global_init(struct bat_priv *bat_priv)
494 {
495 if (bat_priv->tt_global_hash)
496 return 1;
497
498 bat_priv->tt_global_hash = hash_new(1024);
499
500 if (!bat_priv->tt_global_hash)
501 return 0;
502
503 return 1;
504 }
505
506 static void tt_changes_list_free(struct bat_priv *bat_priv)
507 {
508 struct tt_change_node *entry, *safe;
509
510 spin_lock_bh(&bat_priv->tt_changes_list_lock);
511
512 list_for_each_entry_safe(entry, safe, &bat_priv->tt_changes_list,
513 list) {
514 list_del(&entry->list);
515 kfree(entry);
516 }
517
518 atomic_set(&bat_priv->tt_local_changes, 0);
519 spin_unlock_bh(&bat_priv->tt_changes_list_lock);
520 }
521
522 /* caller must hold orig_node refcount */
523 int tt_global_add(struct bat_priv *bat_priv, struct orig_node *orig_node,
524 const unsigned char *tt_addr, uint8_t ttvn, bool roaming,
525 bool wifi)
526 {
527 struct tt_global_entry *tt_global_entry;
528 struct orig_node *orig_node_tmp;
529 int ret = 0;
530
531 tt_global_entry = tt_global_hash_find(bat_priv, tt_addr);
532
533 if (!tt_global_entry) {
534 tt_global_entry =
535 kmalloc(sizeof(*tt_global_entry),
536 GFP_ATOMIC);
537 if (!tt_global_entry)
538 goto out;
539
540 memcpy(tt_global_entry->addr, tt_addr, ETH_ALEN);
541 /* Assign the new orig_node */
542 atomic_inc(&orig_node->refcount);
543 tt_global_entry->orig_node = orig_node;
544 tt_global_entry->ttvn = ttvn;
545 tt_global_entry->flags = NO_FLAGS;
546 tt_global_entry->roam_at = 0;
547 atomic_set(&tt_global_entry->refcount, 2);
548
549 hash_add(bat_priv->tt_global_hash, compare_gtt,
550 choose_orig, tt_global_entry,
551 &tt_global_entry->hash_entry);
552 atomic_inc(&orig_node->tt_size);
553 } else {
554 if (tt_global_entry->orig_node != orig_node) {
555 atomic_dec(&tt_global_entry->orig_node->tt_size);
556 orig_node_tmp = tt_global_entry->orig_node;
557 atomic_inc(&orig_node->refcount);
558 tt_global_entry->orig_node = orig_node;
559 orig_node_free_ref(orig_node_tmp);
560 atomic_inc(&orig_node->tt_size);
561 }
562 tt_global_entry->ttvn = ttvn;
563 tt_global_entry->flags = NO_FLAGS;
564 tt_global_entry->roam_at = 0;
565 }
566
567 if (wifi)
568 tt_global_entry->flags |= TT_CLIENT_WIFI;
569
570 bat_dbg(DBG_TT, bat_priv,
571 "Creating new global tt entry: %pM (via %pM)\n",
572 tt_global_entry->addr, orig_node->orig);
573
574 /* remove address from local hash if present */
575 tt_local_remove(bat_priv, tt_global_entry->addr,
576 "global tt received", roaming);
577 ret = 1;
578 out:
579 if (tt_global_entry)
580 tt_global_entry_free_ref(tt_global_entry);
581 return ret;
582 }
583
584 int tt_global_seq_print_text(struct seq_file *seq, void *offset)
585 {
586 struct net_device *net_dev = (struct net_device *)seq->private;
587 struct bat_priv *bat_priv = netdev_priv(net_dev);
588 struct hashtable_t *hash = bat_priv->tt_global_hash;
589 struct tt_global_entry *tt_global_entry;
590 struct hard_iface *primary_if;
591 struct hlist_node *node;
592 struct hlist_head *head;
593 size_t buf_size, pos;
594 char *buff;
595 int i, ret = 0;
596
597 primary_if = primary_if_get_selected(bat_priv);
598 if (!primary_if) {
599 ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
600 "specify interfaces to enable it\n",
601 net_dev->name);
602 goto out;
603 }
604
605 if (primary_if->if_status != IF_ACTIVE) {
606 ret = seq_printf(seq, "BATMAN mesh %s disabled - "
607 "primary interface not active\n",
608 net_dev->name);
609 goto out;
610 }
611
612 seq_printf(seq,
613 "Globally announced TT entries received via the mesh %s\n",
614 net_dev->name);
615 seq_printf(seq, " %-13s %s %-15s %s %s\n",
616 "Client", "(TTVN)", "Originator", "(Curr TTVN)", "Flags");
617
618 buf_size = 1;
619 /* Estimate length for: " * xx:xx:xx:xx:xx:xx (ttvn) via
620 * xx:xx:xx:xx:xx:xx (cur_ttvn)\n"*/
621 for (i = 0; i < hash->size; i++) {
622 head = &hash->table[i];
623
624 rcu_read_lock();
625 __hlist_for_each_rcu(node, head)
626 buf_size += 67;
627 rcu_read_unlock();
628 }
629
630 buff = kmalloc(buf_size, GFP_ATOMIC);
631 if (!buff) {
632 ret = -ENOMEM;
633 goto out;
634 }
635
636 buff[0] = '\0';
637 pos = 0;
638
639 for (i = 0; i < hash->size; i++) {
640 head = &hash->table[i];
641
642 rcu_read_lock();
643 hlist_for_each_entry_rcu(tt_global_entry, node,
644 head, hash_entry) {
645 pos += snprintf(buff + pos, 69,
646 " * %pM (%3u) via %pM (%3u) "
647 "[%c%c%c]\n", tt_global_entry->addr,
648 tt_global_entry->ttvn,
649 tt_global_entry->orig_node->orig,
650 (uint8_t) atomic_read(
651 &tt_global_entry->orig_node->
652 last_ttvn),
653 (tt_global_entry->flags &
654 TT_CLIENT_ROAM ? 'R' : '.'),
655 (tt_global_entry->flags &
656 TT_CLIENT_PENDING ? 'X' : '.'),
657 (tt_global_entry->flags &
658 TT_CLIENT_WIFI ? 'W' : '.'));
659 }
660 rcu_read_unlock();
661 }
662
663 seq_printf(seq, "%s", buff);
664 kfree(buff);
665 out:
666 if (primary_if)
667 hardif_free_ref(primary_if);
668 return ret;
669 }
670
671 static void _tt_global_del(struct bat_priv *bat_priv,
672 struct tt_global_entry *tt_global_entry,
673 const char *message)
674 {
675 if (!tt_global_entry)
676 goto out;
677
678 bat_dbg(DBG_TT, bat_priv,
679 "Deleting global tt entry %pM (via %pM): %s\n",
680 tt_global_entry->addr, tt_global_entry->orig_node->orig,
681 message);
682
683 atomic_dec(&tt_global_entry->orig_node->tt_size);
684
685 hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
686 tt_global_entry->addr);
687 out:
688 if (tt_global_entry)
689 tt_global_entry_free_ref(tt_global_entry);
690 }
691
692 void tt_global_del(struct bat_priv *bat_priv,
693 struct orig_node *orig_node, const unsigned char *addr,
694 const char *message, bool roaming)
695 {
696 struct tt_global_entry *tt_global_entry = NULL;
697
698 tt_global_entry = tt_global_hash_find(bat_priv, addr);
699 if (!tt_global_entry)
700 goto out;
701
702 if (tt_global_entry->orig_node == orig_node) {
703 if (roaming) {
704 tt_global_entry->flags |= TT_CLIENT_ROAM;
705 tt_global_entry->roam_at = jiffies;
706 goto out;
707 }
708 _tt_global_del(bat_priv, tt_global_entry, message);
709 }
710 out:
711 if (tt_global_entry)
712 tt_global_entry_free_ref(tt_global_entry);
713 }
714
715 void tt_global_del_orig(struct bat_priv *bat_priv,
716 struct orig_node *orig_node, const char *message)
717 {
718 struct tt_global_entry *tt_global_entry;
719 int i;
720 struct hashtable_t *hash = bat_priv->tt_global_hash;
721 struct hlist_node *node, *safe;
722 struct hlist_head *head;
723 spinlock_t *list_lock; /* protects write access to the hash lists */
724
725 if (!hash)
726 return;
727
728 for (i = 0; i < hash->size; i++) {
729 head = &hash->table[i];
730 list_lock = &hash->list_locks[i];
731
732 spin_lock_bh(list_lock);
733 hlist_for_each_entry_safe(tt_global_entry, node, safe,
734 head, hash_entry) {
735 if (tt_global_entry->orig_node == orig_node) {
736 bat_dbg(DBG_TT, bat_priv,
737 "Deleting global tt entry %pM "
738 "(via %pM): originator time out\n",
739 tt_global_entry->addr,
740 tt_global_entry->orig_node->orig);
741 hlist_del_rcu(node);
742 tt_global_entry_free_ref(tt_global_entry);
743 }
744 }
745 spin_unlock_bh(list_lock);
746 }
747 atomic_set(&orig_node->tt_size, 0);
748 }
749
750 static void tt_global_roam_purge(struct bat_priv *bat_priv)
751 {
752 struct hashtable_t *hash = bat_priv->tt_global_hash;
753 struct tt_global_entry *tt_global_entry;
754 struct hlist_node *node, *node_tmp;
755 struct hlist_head *head;
756 spinlock_t *list_lock; /* protects write access to the hash lists */
757 int i;
758
759 for (i = 0; i < hash->size; i++) {
760 head = &hash->table[i];
761 list_lock = &hash->list_locks[i];
762
763 spin_lock_bh(list_lock);
764 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
765 head, hash_entry) {
766 if (!(tt_global_entry->flags & TT_CLIENT_ROAM))
767 continue;
768 if (!is_out_of_time(tt_global_entry->roam_at,
769 TT_CLIENT_ROAM_TIMEOUT * 1000))
770 continue;
771
772 bat_dbg(DBG_TT, bat_priv, "Deleting global "
773 "tt entry (%pM): Roaming timeout\n",
774 tt_global_entry->addr);
775 atomic_dec(&tt_global_entry->orig_node->tt_size);
776 hlist_del_rcu(node);
777 tt_global_entry_free_ref(tt_global_entry);
778 }
779 spin_unlock_bh(list_lock);
780 }
781
782 }
783
784 static void tt_global_table_free(struct bat_priv *bat_priv)
785 {
786 struct hashtable_t *hash;
787 spinlock_t *list_lock; /* protects write access to the hash lists */
788 struct tt_global_entry *tt_global_entry;
789 struct hlist_node *node, *node_tmp;
790 struct hlist_head *head;
791 int i;
792
793 if (!bat_priv->tt_global_hash)
794 return;
795
796 hash = bat_priv->tt_global_hash;
797
798 for (i = 0; i < hash->size; i++) {
799 head = &hash->table[i];
800 list_lock = &hash->list_locks[i];
801
802 spin_lock_bh(list_lock);
803 hlist_for_each_entry_safe(tt_global_entry, node, node_tmp,
804 head, hash_entry) {
805 hlist_del_rcu(node);
806 tt_global_entry_free_ref(tt_global_entry);
807 }
808 spin_unlock_bh(list_lock);
809 }
810
811 hash_destroy(hash);
812
813 bat_priv->tt_global_hash = NULL;
814 }
815
816 static bool _is_ap_isolated(struct tt_local_entry *tt_local_entry,
817 struct tt_global_entry *tt_global_entry)
818 {
819 bool ret = false;
820
821 if (tt_local_entry->flags & TT_CLIENT_WIFI &&
822 tt_global_entry->flags & TT_CLIENT_WIFI)
823 ret = true;
824
825 return ret;
826 }
827
828 struct orig_node *transtable_search(struct bat_priv *bat_priv,
829 const uint8_t *src, const uint8_t *addr)
830 {
831 struct tt_local_entry *tt_local_entry = NULL;
832 struct tt_global_entry *tt_global_entry = NULL;
833 struct orig_node *orig_node = NULL;
834
835 if (src && atomic_read(&bat_priv->ap_isolation)) {
836 tt_local_entry = tt_local_hash_find(bat_priv, src);
837 if (!tt_local_entry)
838 goto out;
839 }
840
841 tt_global_entry = tt_global_hash_find(bat_priv, addr);
842 if (!tt_global_entry)
843 goto out;
844
845 /* check whether the clients should not communicate due to AP
846 * isolation */
847 if (tt_local_entry && _is_ap_isolated(tt_local_entry, tt_global_entry))
848 goto out;
849
850 if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
851 goto out;
852
853 /* A global client marked as PENDING has already moved from that
854 * originator */
855 if (tt_global_entry->flags & TT_CLIENT_PENDING)
856 goto out;
857
858 orig_node = tt_global_entry->orig_node;
859
860 out:
861 if (tt_global_entry)
862 tt_global_entry_free_ref(tt_global_entry);
863 if (tt_local_entry)
864 tt_local_entry_free_ref(tt_local_entry);
865
866 return orig_node;
867 }
868
869 /* Calculates the checksum of the local table of a given orig_node */
870 uint16_t tt_global_crc(struct bat_priv *bat_priv, struct orig_node *orig_node)
871 {
872 uint16_t total = 0, total_one;
873 struct hashtable_t *hash = bat_priv->tt_global_hash;
874 struct tt_global_entry *tt_global_entry;
875 struct hlist_node *node;
876 struct hlist_head *head;
877 int i, j;
878
879 for (i = 0; i < hash->size; i++) {
880 head = &hash->table[i];
881
882 rcu_read_lock();
883 hlist_for_each_entry_rcu(tt_global_entry, node,
884 head, hash_entry) {
885 if (compare_eth(tt_global_entry->orig_node,
886 orig_node)) {
887 /* Roaming clients are in the global table for
888 * consistency only. They don't have to be
889 * taken into account while computing the
890 * global crc */
891 if (tt_global_entry->flags & TT_CLIENT_ROAM)
892 continue;
893 total_one = 0;
894 for (j = 0; j < ETH_ALEN; j++)
895 total_one = crc16_byte(total_one,
896 tt_global_entry->addr[j]);
897 total ^= total_one;
898 }
899 }
900 rcu_read_unlock();
901 }
902
903 return total;
904 }
905
906 /* Calculates the checksum of the local table */
907 uint16_t tt_local_crc(struct bat_priv *bat_priv)
908 {
909 uint16_t total = 0, total_one;
910 struct hashtable_t *hash = bat_priv->tt_local_hash;
911 struct tt_local_entry *tt_local_entry;
912 struct hlist_node *node;
913 struct hlist_head *head;
914 int i, j;
915
916 for (i = 0; i < hash->size; i++) {
917 head = &hash->table[i];
918
919 rcu_read_lock();
920 hlist_for_each_entry_rcu(tt_local_entry, node,
921 head, hash_entry) {
922 /* not yet committed clients have not to be taken into
923 * account while computing the CRC */
924 if (tt_local_entry->flags & TT_CLIENT_NEW)
925 continue;
926 total_one = 0;
927 for (j = 0; j < ETH_ALEN; j++)
928 total_one = crc16_byte(total_one,
929 tt_local_entry->addr[j]);
930 total ^= total_one;
931 }
932 rcu_read_unlock();
933 }
934
935 return total;
936 }
937
938 static void tt_req_list_free(struct bat_priv *bat_priv)
939 {
940 struct tt_req_node *node, *safe;
941
942 spin_lock_bh(&bat_priv->tt_req_list_lock);
943
944 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
945 list_del(&node->list);
946 kfree(node);
947 }
948
949 spin_unlock_bh(&bat_priv->tt_req_list_lock);
950 }
951
952 void tt_save_orig_buffer(struct bat_priv *bat_priv, struct orig_node *orig_node,
953 const unsigned char *tt_buff, uint8_t tt_num_changes)
954 {
955 uint16_t tt_buff_len = tt_len(tt_num_changes);
956
957 /* Replace the old buffer only if I received something in the
958 * last OGM (the OGM could carry no changes) */
959 spin_lock_bh(&orig_node->tt_buff_lock);
960 if (tt_buff_len > 0) {
961 kfree(orig_node->tt_buff);
962 orig_node->tt_buff_len = 0;
963 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
964 if (orig_node->tt_buff) {
965 memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
966 orig_node->tt_buff_len = tt_buff_len;
967 }
968 }
969 spin_unlock_bh(&orig_node->tt_buff_lock);
970 }
971
972 static void tt_req_purge(struct bat_priv *bat_priv)
973 {
974 struct tt_req_node *node, *safe;
975
976 spin_lock_bh(&bat_priv->tt_req_list_lock);
977 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
978 if (is_out_of_time(node->issued_at,
979 TT_REQUEST_TIMEOUT * 1000)) {
980 list_del(&node->list);
981 kfree(node);
982 }
983 }
984 spin_unlock_bh(&bat_priv->tt_req_list_lock);
985 }
986
987 /* returns the pointer to the new tt_req_node struct if no request
988 * has already been issued for this orig_node, NULL otherwise */
989 static struct tt_req_node *new_tt_req_node(struct bat_priv *bat_priv,
990 struct orig_node *orig_node)
991 {
992 struct tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
993
994 spin_lock_bh(&bat_priv->tt_req_list_lock);
995 list_for_each_entry(tt_req_node_tmp, &bat_priv->tt_req_list, list) {
996 if (compare_eth(tt_req_node_tmp, orig_node) &&
997 !is_out_of_time(tt_req_node_tmp->issued_at,
998 TT_REQUEST_TIMEOUT * 1000))
999 goto unlock;
1000 }
1001
1002 tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
1003 if (!tt_req_node)
1004 goto unlock;
1005
1006 memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
1007 tt_req_node->issued_at = jiffies;
1008
1009 list_add(&tt_req_node->list, &bat_priv->tt_req_list);
1010 unlock:
1011 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1012 return tt_req_node;
1013 }
1014
1015 /* data_ptr is useless here, but has to be kept to respect the prototype */
1016 static int tt_local_valid_entry(const void *entry_ptr, const void *data_ptr)
1017 {
1018 const struct tt_local_entry *tt_local_entry = entry_ptr;
1019
1020 if (tt_local_entry->flags & TT_CLIENT_NEW)
1021 return 0;
1022 return 1;
1023 }
1024
1025 static int tt_global_valid_entry(const void *entry_ptr, const void *data_ptr)
1026 {
1027 const struct tt_global_entry *tt_global_entry = entry_ptr;
1028 const struct orig_node *orig_node = data_ptr;
1029
1030 if (tt_global_entry->flags & TT_CLIENT_ROAM)
1031 return 0;
1032
1033 return (tt_global_entry->orig_node == orig_node);
1034 }
1035
1036 static struct sk_buff *tt_response_fill_table(uint16_t tt_len, uint8_t ttvn,
1037 struct hashtable_t *hash,
1038 struct hard_iface *primary_if,
1039 int (*valid_cb)(const void *,
1040 const void *),
1041 void *cb_data)
1042 {
1043 struct tt_local_entry *tt_local_entry;
1044 struct tt_query_packet *tt_response;
1045 struct tt_change *tt_change;
1046 struct hlist_node *node;
1047 struct hlist_head *head;
1048 struct sk_buff *skb = NULL;
1049 uint16_t tt_tot, tt_count;
1050 ssize_t tt_query_size = sizeof(struct tt_query_packet);
1051 int i;
1052
1053 if (tt_query_size + tt_len > primary_if->soft_iface->mtu) {
1054 tt_len = primary_if->soft_iface->mtu - tt_query_size;
1055 tt_len -= tt_len % sizeof(struct tt_change);
1056 }
1057 tt_tot = tt_len / sizeof(struct tt_change);
1058
1059 skb = dev_alloc_skb(tt_query_size + tt_len + ETH_HLEN);
1060 if (!skb)
1061 goto out;
1062
1063 skb_reserve(skb, ETH_HLEN);
1064 tt_response = (struct tt_query_packet *)skb_put(skb,
1065 tt_query_size + tt_len);
1066 tt_response->ttvn = ttvn;
1067
1068 tt_change = (struct tt_change *)(skb->data + tt_query_size);
1069 tt_count = 0;
1070
1071 rcu_read_lock();
1072 for (i = 0; i < hash->size; i++) {
1073 head = &hash->table[i];
1074
1075 hlist_for_each_entry_rcu(tt_local_entry, node,
1076 head, hash_entry) {
1077 if (tt_count == tt_tot)
1078 break;
1079
1080 if ((valid_cb) && (!valid_cb(tt_local_entry, cb_data)))
1081 continue;
1082
1083 memcpy(tt_change->addr, tt_local_entry->addr, ETH_ALEN);
1084 tt_change->flags = NO_FLAGS;
1085
1086 tt_count++;
1087 tt_change++;
1088 }
1089 }
1090 rcu_read_unlock();
1091
1092 /* store in the message the number of entries we have successfully
1093 * copied */
1094 tt_response->tt_data = htons(tt_count);
1095
1096 out:
1097 return skb;
1098 }
1099
1100 static int send_tt_request(struct bat_priv *bat_priv,
1101 struct orig_node *dst_orig_node,
1102 uint8_t ttvn, uint16_t tt_crc, bool full_table)
1103 {
1104 struct sk_buff *skb = NULL;
1105 struct tt_query_packet *tt_request;
1106 struct neigh_node *neigh_node = NULL;
1107 struct hard_iface *primary_if;
1108 struct tt_req_node *tt_req_node = NULL;
1109 int ret = 1;
1110
1111 primary_if = primary_if_get_selected(bat_priv);
1112 if (!primary_if)
1113 goto out;
1114
1115 /* The new tt_req will be issued only if I'm not waiting for a
1116 * reply from the same orig_node yet */
1117 tt_req_node = new_tt_req_node(bat_priv, dst_orig_node);
1118 if (!tt_req_node)
1119 goto out;
1120
1121 skb = dev_alloc_skb(sizeof(struct tt_query_packet) + ETH_HLEN);
1122 if (!skb)
1123 goto out;
1124
1125 skb_reserve(skb, ETH_HLEN);
1126
1127 tt_request = (struct tt_query_packet *)skb_put(skb,
1128 sizeof(struct tt_query_packet));
1129
1130 tt_request->packet_type = BAT_TT_QUERY;
1131 tt_request->version = COMPAT_VERSION;
1132 memcpy(tt_request->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1133 memcpy(tt_request->dst, dst_orig_node->orig, ETH_ALEN);
1134 tt_request->ttl = TTL;
1135 tt_request->ttvn = ttvn;
1136 tt_request->tt_data = tt_crc;
1137 tt_request->flags = TT_REQUEST;
1138
1139 if (full_table)
1140 tt_request->flags |= TT_FULL_TABLE;
1141
1142 neigh_node = orig_node_get_router(dst_orig_node);
1143 if (!neigh_node)
1144 goto out;
1145
1146 bat_dbg(DBG_TT, bat_priv, "Sending TT_REQUEST to %pM via %pM "
1147 "[%c]\n", dst_orig_node->orig, neigh_node->addr,
1148 (full_table ? 'F' : '.'));
1149
1150 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1151 ret = 0;
1152
1153 out:
1154 if (neigh_node)
1155 neigh_node_free_ref(neigh_node);
1156 if (primary_if)
1157 hardif_free_ref(primary_if);
1158 if (ret)
1159 kfree_skb(skb);
1160 if (ret && tt_req_node) {
1161 spin_lock_bh(&bat_priv->tt_req_list_lock);
1162 list_del(&tt_req_node->list);
1163 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1164 kfree(tt_req_node);
1165 }
1166 return ret;
1167 }
1168
1169 static bool send_other_tt_response(struct bat_priv *bat_priv,
1170 struct tt_query_packet *tt_request)
1171 {
1172 struct orig_node *req_dst_orig_node = NULL, *res_dst_orig_node = NULL;
1173 struct neigh_node *neigh_node = NULL;
1174 struct hard_iface *primary_if = NULL;
1175 uint8_t orig_ttvn, req_ttvn, ttvn;
1176 int ret = false;
1177 unsigned char *tt_buff;
1178 bool full_table;
1179 uint16_t tt_len, tt_tot;
1180 struct sk_buff *skb = NULL;
1181 struct tt_query_packet *tt_response;
1182
1183 bat_dbg(DBG_TT, bat_priv,
1184 "Received TT_REQUEST from %pM for "
1185 "ttvn: %u (%pM) [%c]\n", tt_request->src,
1186 tt_request->ttvn, tt_request->dst,
1187 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1188
1189 /* Let's get the orig node of the REAL destination */
1190 req_dst_orig_node = get_orig_node(bat_priv, tt_request->dst);
1191 if (!req_dst_orig_node)
1192 goto out;
1193
1194 res_dst_orig_node = get_orig_node(bat_priv, tt_request->src);
1195 if (!res_dst_orig_node)
1196 goto out;
1197
1198 neigh_node = orig_node_get_router(res_dst_orig_node);
1199 if (!neigh_node)
1200 goto out;
1201
1202 primary_if = primary_if_get_selected(bat_priv);
1203 if (!primary_if)
1204 goto out;
1205
1206 orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1207 req_ttvn = tt_request->ttvn;
1208
1209 /* I don't have the requested data */
1210 if (orig_ttvn != req_ttvn ||
1211 tt_request->tt_data != req_dst_orig_node->tt_crc)
1212 goto out;
1213
1214 /* If the full table has been explicitly requested */
1215 if (tt_request->flags & TT_FULL_TABLE ||
1216 !req_dst_orig_node->tt_buff)
1217 full_table = true;
1218 else
1219 full_table = false;
1220
1221 /* In this version, fragmentation is not implemented, then
1222 * I'll send only one packet with as much TT entries as I can */
1223 if (!full_table) {
1224 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
1225 tt_len = req_dst_orig_node->tt_buff_len;
1226 tt_tot = tt_len / sizeof(struct tt_change);
1227
1228 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1229 tt_len + ETH_HLEN);
1230 if (!skb)
1231 goto unlock;
1232
1233 skb_reserve(skb, ETH_HLEN);
1234 tt_response = (struct tt_query_packet *)skb_put(skb,
1235 sizeof(struct tt_query_packet) + tt_len);
1236 tt_response->ttvn = req_ttvn;
1237 tt_response->tt_data = htons(tt_tot);
1238
1239 tt_buff = skb->data + sizeof(struct tt_query_packet);
1240 /* Copy the last orig_node's OGM buffer */
1241 memcpy(tt_buff, req_dst_orig_node->tt_buff,
1242 req_dst_orig_node->tt_buff_len);
1243
1244 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1245 } else {
1246 tt_len = (uint16_t)atomic_read(&req_dst_orig_node->tt_size) *
1247 sizeof(struct tt_change);
1248 ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
1249
1250 skb = tt_response_fill_table(tt_len, ttvn,
1251 bat_priv->tt_global_hash,
1252 primary_if, tt_global_valid_entry,
1253 req_dst_orig_node);
1254 if (!skb)
1255 goto out;
1256
1257 tt_response = (struct tt_query_packet *)skb->data;
1258 }
1259
1260 tt_response->packet_type = BAT_TT_QUERY;
1261 tt_response->version = COMPAT_VERSION;
1262 tt_response->ttl = TTL;
1263 memcpy(tt_response->src, req_dst_orig_node->orig, ETH_ALEN);
1264 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1265 tt_response->flags = TT_RESPONSE;
1266
1267 if (full_table)
1268 tt_response->flags |= TT_FULL_TABLE;
1269
1270 bat_dbg(DBG_TT, bat_priv,
1271 "Sending TT_RESPONSE %pM via %pM for %pM (ttvn: %u)\n",
1272 res_dst_orig_node->orig, neigh_node->addr,
1273 req_dst_orig_node->orig, req_ttvn);
1274
1275 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1276 ret = true;
1277 goto out;
1278
1279 unlock:
1280 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
1281
1282 out:
1283 if (res_dst_orig_node)
1284 orig_node_free_ref(res_dst_orig_node);
1285 if (req_dst_orig_node)
1286 orig_node_free_ref(req_dst_orig_node);
1287 if (neigh_node)
1288 neigh_node_free_ref(neigh_node);
1289 if (primary_if)
1290 hardif_free_ref(primary_if);
1291 if (!ret)
1292 kfree_skb(skb);
1293 return ret;
1294
1295 }
1296 static bool send_my_tt_response(struct bat_priv *bat_priv,
1297 struct tt_query_packet *tt_request)
1298 {
1299 struct orig_node *orig_node = NULL;
1300 struct neigh_node *neigh_node = NULL;
1301 struct hard_iface *primary_if = NULL;
1302 uint8_t my_ttvn, req_ttvn, ttvn;
1303 int ret = false;
1304 unsigned char *tt_buff;
1305 bool full_table;
1306 uint16_t tt_len, tt_tot;
1307 struct sk_buff *skb = NULL;
1308 struct tt_query_packet *tt_response;
1309
1310 bat_dbg(DBG_TT, bat_priv,
1311 "Received TT_REQUEST from %pM for "
1312 "ttvn: %u (me) [%c]\n", tt_request->src,
1313 tt_request->ttvn,
1314 (tt_request->flags & TT_FULL_TABLE ? 'F' : '.'));
1315
1316
1317 my_ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1318 req_ttvn = tt_request->ttvn;
1319
1320 orig_node = get_orig_node(bat_priv, tt_request->src);
1321 if (!orig_node)
1322 goto out;
1323
1324 neigh_node = orig_node_get_router(orig_node);
1325 if (!neigh_node)
1326 goto out;
1327
1328 primary_if = primary_if_get_selected(bat_priv);
1329 if (!primary_if)
1330 goto out;
1331
1332 /* If the full table has been explicitly requested or the gap
1333 * is too big send the whole local translation table */
1334 if (tt_request->flags & TT_FULL_TABLE || my_ttvn != req_ttvn ||
1335 !bat_priv->tt_buff)
1336 full_table = true;
1337 else
1338 full_table = false;
1339
1340 /* In this version, fragmentation is not implemented, then
1341 * I'll send only one packet with as much TT entries as I can */
1342 if (!full_table) {
1343 spin_lock_bh(&bat_priv->tt_buff_lock);
1344 tt_len = bat_priv->tt_buff_len;
1345 tt_tot = tt_len / sizeof(struct tt_change);
1346
1347 skb = dev_alloc_skb(sizeof(struct tt_query_packet) +
1348 tt_len + ETH_HLEN);
1349 if (!skb)
1350 goto unlock;
1351
1352 skb_reserve(skb, ETH_HLEN);
1353 tt_response = (struct tt_query_packet *)skb_put(skb,
1354 sizeof(struct tt_query_packet) + tt_len);
1355 tt_response->ttvn = req_ttvn;
1356 tt_response->tt_data = htons(tt_tot);
1357
1358 tt_buff = skb->data + sizeof(struct tt_query_packet);
1359 memcpy(tt_buff, bat_priv->tt_buff,
1360 bat_priv->tt_buff_len);
1361 spin_unlock_bh(&bat_priv->tt_buff_lock);
1362 } else {
1363 tt_len = (uint16_t)atomic_read(&bat_priv->num_local_tt) *
1364 sizeof(struct tt_change);
1365 ttvn = (uint8_t)atomic_read(&bat_priv->ttvn);
1366
1367 skb = tt_response_fill_table(tt_len, ttvn,
1368 bat_priv->tt_local_hash,
1369 primary_if, tt_local_valid_entry,
1370 NULL);
1371 if (!skb)
1372 goto out;
1373
1374 tt_response = (struct tt_query_packet *)skb->data;
1375 }
1376
1377 tt_response->packet_type = BAT_TT_QUERY;
1378 tt_response->version = COMPAT_VERSION;
1379 tt_response->ttl = TTL;
1380 memcpy(tt_response->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1381 memcpy(tt_response->dst, tt_request->src, ETH_ALEN);
1382 tt_response->flags = TT_RESPONSE;
1383
1384 if (full_table)
1385 tt_response->flags |= TT_FULL_TABLE;
1386
1387 bat_dbg(DBG_TT, bat_priv,
1388 "Sending TT_RESPONSE to %pM via %pM [%c]\n",
1389 orig_node->orig, neigh_node->addr,
1390 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1391
1392 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1393 ret = true;
1394 goto out;
1395
1396 unlock:
1397 spin_unlock_bh(&bat_priv->tt_buff_lock);
1398 out:
1399 if (orig_node)
1400 orig_node_free_ref(orig_node);
1401 if (neigh_node)
1402 neigh_node_free_ref(neigh_node);
1403 if (primary_if)
1404 hardif_free_ref(primary_if);
1405 if (!ret)
1406 kfree_skb(skb);
1407 /* This packet was for me, so it doesn't need to be re-routed */
1408 return true;
1409 }
1410
1411 bool send_tt_response(struct bat_priv *bat_priv,
1412 struct tt_query_packet *tt_request)
1413 {
1414 if (is_my_mac(tt_request->dst))
1415 return send_my_tt_response(bat_priv, tt_request);
1416 else
1417 return send_other_tt_response(bat_priv, tt_request);
1418 }
1419
1420 static void _tt_update_changes(struct bat_priv *bat_priv,
1421 struct orig_node *orig_node,
1422 struct tt_change *tt_change,
1423 uint16_t tt_num_changes, uint8_t ttvn)
1424 {
1425 int i;
1426
1427 for (i = 0; i < tt_num_changes; i++) {
1428 if ((tt_change + i)->flags & TT_CLIENT_DEL)
1429 tt_global_del(bat_priv, orig_node,
1430 (tt_change + i)->addr,
1431 "tt removed by changes",
1432 (tt_change + i)->flags & TT_CLIENT_ROAM);
1433 else
1434 if (!tt_global_add(bat_priv, orig_node,
1435 (tt_change + i)->addr, ttvn, false,
1436 (tt_change + i)->flags &
1437 TT_CLIENT_WIFI))
1438 /* In case of problem while storing a
1439 * global_entry, we stop the updating
1440 * procedure without committing the
1441 * ttvn change. This will avoid to send
1442 * corrupted data on tt_request
1443 */
1444 return;
1445 }
1446 }
1447
1448 static void tt_fill_gtable(struct bat_priv *bat_priv,
1449 struct tt_query_packet *tt_response)
1450 {
1451 struct orig_node *orig_node = NULL;
1452
1453 orig_node = orig_hash_find(bat_priv, tt_response->src);
1454 if (!orig_node)
1455 goto out;
1456
1457 /* Purge the old table first.. */
1458 tt_global_del_orig(bat_priv, orig_node, "Received full table");
1459
1460 _tt_update_changes(bat_priv, orig_node,
1461 (struct tt_change *)(tt_response + 1),
1462 tt_response->tt_data, tt_response->ttvn);
1463
1464 spin_lock_bh(&orig_node->tt_buff_lock);
1465 kfree(orig_node->tt_buff);
1466 orig_node->tt_buff_len = 0;
1467 orig_node->tt_buff = NULL;
1468 spin_unlock_bh(&orig_node->tt_buff_lock);
1469
1470 atomic_set(&orig_node->last_ttvn, tt_response->ttvn);
1471
1472 out:
1473 if (orig_node)
1474 orig_node_free_ref(orig_node);
1475 }
1476
1477 static void tt_update_changes(struct bat_priv *bat_priv,
1478 struct orig_node *orig_node,
1479 uint16_t tt_num_changes, uint8_t ttvn,
1480 struct tt_change *tt_change)
1481 {
1482 _tt_update_changes(bat_priv, orig_node, tt_change, tt_num_changes,
1483 ttvn);
1484
1485 tt_save_orig_buffer(bat_priv, orig_node, (unsigned char *)tt_change,
1486 tt_num_changes);
1487 atomic_set(&orig_node->last_ttvn, ttvn);
1488 }
1489
1490 bool is_my_client(struct bat_priv *bat_priv, const uint8_t *addr)
1491 {
1492 struct tt_local_entry *tt_local_entry = NULL;
1493 bool ret = false;
1494
1495 tt_local_entry = tt_local_hash_find(bat_priv, addr);
1496 if (!tt_local_entry)
1497 goto out;
1498 /* Check if the client has been logically deleted (but is kept for
1499 * consistency purpose) */
1500 if (tt_local_entry->flags & TT_CLIENT_PENDING)
1501 goto out;
1502 ret = true;
1503 out:
1504 if (tt_local_entry)
1505 tt_local_entry_free_ref(tt_local_entry);
1506 return ret;
1507 }
1508
1509 void handle_tt_response(struct bat_priv *bat_priv,
1510 struct tt_query_packet *tt_response)
1511 {
1512 struct tt_req_node *node, *safe;
1513 struct orig_node *orig_node = NULL;
1514
1515 bat_dbg(DBG_TT, bat_priv, "Received TT_RESPONSE from %pM for "
1516 "ttvn %d t_size: %d [%c]\n",
1517 tt_response->src, tt_response->ttvn,
1518 tt_response->tt_data,
1519 (tt_response->flags & TT_FULL_TABLE ? 'F' : '.'));
1520
1521 orig_node = orig_hash_find(bat_priv, tt_response->src);
1522 if (!orig_node)
1523 goto out;
1524
1525 if (tt_response->flags & TT_FULL_TABLE)
1526 tt_fill_gtable(bat_priv, tt_response);
1527 else
1528 tt_update_changes(bat_priv, orig_node, tt_response->tt_data,
1529 tt_response->ttvn,
1530 (struct tt_change *)(tt_response + 1));
1531
1532 /* Delete the tt_req_node from pending tt_requests list */
1533 spin_lock_bh(&bat_priv->tt_req_list_lock);
1534 list_for_each_entry_safe(node, safe, &bat_priv->tt_req_list, list) {
1535 if (!compare_eth(node->addr, tt_response->src))
1536 continue;
1537 list_del(&node->list);
1538 kfree(node);
1539 }
1540 spin_unlock_bh(&bat_priv->tt_req_list_lock);
1541
1542 /* Recalculate the CRC for this orig_node and store it */
1543 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1544 /* Roaming phase is over: tables are in sync again. I can
1545 * unset the flag */
1546 orig_node->tt_poss_change = false;
1547 out:
1548 if (orig_node)
1549 orig_node_free_ref(orig_node);
1550 }
1551
1552 int tt_init(struct bat_priv *bat_priv)
1553 {
1554 if (!tt_local_init(bat_priv))
1555 return 0;
1556
1557 if (!tt_global_init(bat_priv))
1558 return 0;
1559
1560 tt_start_timer(bat_priv);
1561
1562 return 1;
1563 }
1564
1565 static void tt_roam_list_free(struct bat_priv *bat_priv)
1566 {
1567 struct tt_roam_node *node, *safe;
1568
1569 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1570
1571 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1572 list_del(&node->list);
1573 kfree(node);
1574 }
1575
1576 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1577 }
1578
1579 static void tt_roam_purge(struct bat_priv *bat_priv)
1580 {
1581 struct tt_roam_node *node, *safe;
1582
1583 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1584 list_for_each_entry_safe(node, safe, &bat_priv->tt_roam_list, list) {
1585 if (!is_out_of_time(node->first_time,
1586 ROAMING_MAX_TIME * 1000))
1587 continue;
1588
1589 list_del(&node->list);
1590 kfree(node);
1591 }
1592 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1593 }
1594
1595 /* This function checks whether the client already reached the
1596 * maximum number of possible roaming phases. In this case the ROAMING_ADV
1597 * will not be sent.
1598 *
1599 * returns true if the ROAMING_ADV can be sent, false otherwise */
1600 static bool tt_check_roam_count(struct bat_priv *bat_priv,
1601 uint8_t *client)
1602 {
1603 struct tt_roam_node *tt_roam_node;
1604 bool ret = false;
1605
1606 spin_lock_bh(&bat_priv->tt_roam_list_lock);
1607 /* The new tt_req will be issued only if I'm not waiting for a
1608 * reply from the same orig_node yet */
1609 list_for_each_entry(tt_roam_node, &bat_priv->tt_roam_list, list) {
1610 if (!compare_eth(tt_roam_node->addr, client))
1611 continue;
1612
1613 if (is_out_of_time(tt_roam_node->first_time,
1614 ROAMING_MAX_TIME * 1000))
1615 continue;
1616
1617 if (!atomic_dec_not_zero(&tt_roam_node->counter))
1618 /* Sorry, you roamed too many times! */
1619 goto unlock;
1620 ret = true;
1621 break;
1622 }
1623
1624 if (!ret) {
1625 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
1626 if (!tt_roam_node)
1627 goto unlock;
1628
1629 tt_roam_node->first_time = jiffies;
1630 atomic_set(&tt_roam_node->counter, ROAMING_MAX_COUNT - 1);
1631 memcpy(tt_roam_node->addr, client, ETH_ALEN);
1632
1633 list_add(&tt_roam_node->list, &bat_priv->tt_roam_list);
1634 ret = true;
1635 }
1636
1637 unlock:
1638 spin_unlock_bh(&bat_priv->tt_roam_list_lock);
1639 return ret;
1640 }
1641
1642 void send_roam_adv(struct bat_priv *bat_priv, uint8_t *client,
1643 struct orig_node *orig_node)
1644 {
1645 struct neigh_node *neigh_node = NULL;
1646 struct sk_buff *skb = NULL;
1647 struct roam_adv_packet *roam_adv_packet;
1648 int ret = 1;
1649 struct hard_iface *primary_if;
1650
1651 /* before going on we have to check whether the client has
1652 * already roamed to us too many times */
1653 if (!tt_check_roam_count(bat_priv, client))
1654 goto out;
1655
1656 skb = dev_alloc_skb(sizeof(struct roam_adv_packet) + ETH_HLEN);
1657 if (!skb)
1658 goto out;
1659
1660 skb_reserve(skb, ETH_HLEN);
1661
1662 roam_adv_packet = (struct roam_adv_packet *)skb_put(skb,
1663 sizeof(struct roam_adv_packet));
1664
1665 roam_adv_packet->packet_type = BAT_ROAM_ADV;
1666 roam_adv_packet->version = COMPAT_VERSION;
1667 roam_adv_packet->ttl = TTL;
1668 primary_if = primary_if_get_selected(bat_priv);
1669 if (!primary_if)
1670 goto out;
1671 memcpy(roam_adv_packet->src, primary_if->net_dev->dev_addr, ETH_ALEN);
1672 hardif_free_ref(primary_if);
1673 memcpy(roam_adv_packet->dst, orig_node->orig, ETH_ALEN);
1674 memcpy(roam_adv_packet->client, client, ETH_ALEN);
1675
1676 neigh_node = orig_node_get_router(orig_node);
1677 if (!neigh_node)
1678 goto out;
1679
1680 bat_dbg(DBG_TT, bat_priv,
1681 "Sending ROAMING_ADV to %pM (client %pM) via %pM\n",
1682 orig_node->orig, client, neigh_node->addr);
1683
1684 send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
1685 ret = 0;
1686
1687 out:
1688 if (neigh_node)
1689 neigh_node_free_ref(neigh_node);
1690 if (ret)
1691 kfree_skb(skb);
1692 return;
1693 }
1694
1695 static void tt_purge(struct work_struct *work)
1696 {
1697 struct delayed_work *delayed_work =
1698 container_of(work, struct delayed_work, work);
1699 struct bat_priv *bat_priv =
1700 container_of(delayed_work, struct bat_priv, tt_work);
1701
1702 tt_local_purge(bat_priv);
1703 tt_global_roam_purge(bat_priv);
1704 tt_req_purge(bat_priv);
1705 tt_roam_purge(bat_priv);
1706
1707 tt_start_timer(bat_priv);
1708 }
1709
1710 void tt_free(struct bat_priv *bat_priv)
1711 {
1712 cancel_delayed_work_sync(&bat_priv->tt_work);
1713
1714 tt_local_table_free(bat_priv);
1715 tt_global_table_free(bat_priv);
1716 tt_req_list_free(bat_priv);
1717 tt_changes_list_free(bat_priv);
1718 tt_roam_list_free(bat_priv);
1719
1720 kfree(bat_priv->tt_buff);
1721 }
1722
1723 /* This function will reset the specified flags from all the entries in
1724 * the given hash table and will increment num_local_tt for each involved
1725 * entry */
1726 static void tt_local_reset_flags(struct bat_priv *bat_priv, uint16_t flags)
1727 {
1728 int i;
1729 struct hashtable_t *hash = bat_priv->tt_local_hash;
1730 struct hlist_head *head;
1731 struct hlist_node *node;
1732 struct tt_local_entry *tt_local_entry;
1733
1734 if (!hash)
1735 return;
1736
1737 for (i = 0; i < hash->size; i++) {
1738 head = &hash->table[i];
1739
1740 rcu_read_lock();
1741 hlist_for_each_entry_rcu(tt_local_entry, node,
1742 head, hash_entry) {
1743 if (!(tt_local_entry->flags & flags))
1744 continue;
1745 tt_local_entry->flags &= ~flags;
1746 atomic_inc(&bat_priv->num_local_tt);
1747 }
1748 rcu_read_unlock();
1749 }
1750
1751 }
1752
1753 /* Purge out all the tt local entries marked with TT_CLIENT_PENDING */
1754 static void tt_local_purge_pending_clients(struct bat_priv *bat_priv)
1755 {
1756 struct hashtable_t *hash = bat_priv->tt_local_hash;
1757 struct tt_local_entry *tt_local_entry;
1758 struct hlist_node *node, *node_tmp;
1759 struct hlist_head *head;
1760 spinlock_t *list_lock; /* protects write access to the hash lists */
1761 int i;
1762
1763 if (!hash)
1764 return;
1765
1766 for (i = 0; i < hash->size; i++) {
1767 head = &hash->table[i];
1768 list_lock = &hash->list_locks[i];
1769
1770 spin_lock_bh(list_lock);
1771 hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
1772 head, hash_entry) {
1773 if (!(tt_local_entry->flags & TT_CLIENT_PENDING))
1774 continue;
1775
1776 bat_dbg(DBG_TT, bat_priv, "Deleting local tt entry "
1777 "(%pM): pending\n", tt_local_entry->addr);
1778
1779 atomic_dec(&bat_priv->num_local_tt);
1780 hlist_del_rcu(node);
1781 tt_local_entry_free_ref(tt_local_entry);
1782 }
1783 spin_unlock_bh(list_lock);
1784 }
1785
1786 }
1787
1788 void tt_commit_changes(struct bat_priv *bat_priv)
1789 {
1790 tt_local_reset_flags(bat_priv, TT_CLIENT_NEW);
1791 tt_local_purge_pending_clients(bat_priv);
1792
1793 /* Increment the TTVN only once per OGM interval */
1794 atomic_inc(&bat_priv->ttvn);
1795 bat_priv->tt_poss_change = false;
1796 }
1797
1798 bool is_ap_isolated(struct bat_priv *bat_priv, uint8_t *src, uint8_t *dst)
1799 {
1800 struct tt_local_entry *tt_local_entry = NULL;
1801 struct tt_global_entry *tt_global_entry = NULL;
1802 bool ret = true;
1803
1804 if (!atomic_read(&bat_priv->ap_isolation))
1805 return false;
1806
1807 tt_local_entry = tt_local_hash_find(bat_priv, dst);
1808 if (!tt_local_entry)
1809 goto out;
1810
1811 tt_global_entry = tt_global_hash_find(bat_priv, src);
1812 if (!tt_global_entry)
1813 goto out;
1814
1815 if (_is_ap_isolated(tt_local_entry, tt_global_entry))
1816 goto out;
1817
1818 ret = false;
1819
1820 out:
1821 if (tt_global_entry)
1822 tt_global_entry_free_ref(tt_global_entry);
1823 if (tt_local_entry)
1824 tt_local_entry_free_ref(tt_local_entry);
1825 return ret;
1826 }
1827
1828 void tt_update_orig(struct bat_priv *bat_priv, struct orig_node *orig_node,
1829 const unsigned char *tt_buff, uint8_t tt_num_changes,
1830 uint8_t ttvn, uint16_t tt_crc)
1831 {
1832 uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
1833 bool full_table = true;
1834
1835 /* the ttvn increased by one -> we can apply the attached changes */
1836 if (ttvn - orig_ttvn == 1) {
1837 /* the OGM could not contain the changes due to their size or
1838 * because they have already been sent TT_OGM_APPEND_MAX times.
1839 * In this case send a tt request */
1840 if (!tt_num_changes) {
1841 full_table = false;
1842 goto request_table;
1843 }
1844
1845 tt_update_changes(bat_priv, orig_node, tt_num_changes, ttvn,
1846 (struct tt_change *)tt_buff);
1847
1848 /* Even if we received the precomputed crc with the OGM, we
1849 * prefer to recompute it to spot any possible inconsistency
1850 * in the global table */
1851 orig_node->tt_crc = tt_global_crc(bat_priv, orig_node);
1852
1853 /* The ttvn alone is not enough to guarantee consistency
1854 * because a single value could represent different states
1855 * (due to the wrap around). Thus a node has to check whether
1856 * the resulting table (after applying the changes) is still
1857 * consistent or not. E.g. a node could disconnect while its
1858 * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
1859 * checking the CRC value is mandatory to detect the
1860 * inconsistency */
1861 if (orig_node->tt_crc != tt_crc)
1862 goto request_table;
1863
1864 /* Roaming phase is over: tables are in sync again. I can
1865 * unset the flag */
1866 orig_node->tt_poss_change = false;
1867 } else {
1868 /* if we missed more than one change or our tables are not
1869 * in sync anymore -> request fresh tt data */
1870 if (ttvn != orig_ttvn || orig_node->tt_crc != tt_crc) {
1871 request_table:
1872 bat_dbg(DBG_TT, bat_priv, "TT inconsistency for %pM. "
1873 "Need to retrieve the correct information "
1874 "(ttvn: %u last_ttvn: %u crc: %u last_crc: "
1875 "%u num_changes: %u)\n", orig_node->orig, ttvn,
1876 orig_ttvn, tt_crc, orig_node->tt_crc,
1877 tt_num_changes);
1878 send_tt_request(bat_priv, orig_node, ttvn, tt_crc,
1879 full_table);
1880 return;
1881 }
1882 }
1883 }
Mirror of the linux-mips.org kernel tree