summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/translation-table.c
blob: 802eacef05b85bd42ffd1738dad7095d6d532067 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
/*
 * Copyright (C) 2007-2011 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner, Simon Wunderlich
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 *
 */

#include "main.h"
#include "translation-table.h"
#include "soft-interface.h"
#include "hard-interface.h"
#include "hash.h"
#include "originator.h"

static void tt_local_purge(struct work_struct *work);
static void _tt_global_del_orig(struct bat_priv *bat_priv,
				 struct tt_global_entry *tt_global_entry,
				 const char *message);

/* returns 1 if they are the same mac addr */
static int compare_ltt(const struct hlist_node *node, const void *data2)
{
	const void *data1 = container_of(node, struct tt_local_entry,
					 hash_entry);

	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}

/* returns 1 if they are the same mac addr */
static int compare_gtt(const struct hlist_node *node, const void *data2)
{
	const void *data1 = container_of(node, struct tt_global_entry,
					 hash_entry);

	return (memcmp(data1, data2, ETH_ALEN) == 0 ? 1 : 0);
}

static void tt_local_start_timer(struct bat_priv *bat_priv)
{
	INIT_DELAYED_WORK(&bat_priv->tt_work, tt_local_purge);
	queue_delayed_work(bat_event_workqueue, &bat_priv->tt_work, 10 * HZ);
}

static struct tt_local_entry *tt_local_hash_find(struct bat_priv *bat_priv,
						 const void *data)
{
	struct hashtable_t *hash = bat_priv->tt_local_hash;
	struct hlist_head *head;
	struct hlist_node *node;
	struct tt_local_entry *tt_local_entry, *tt_local_entry_tmp = NULL;
	int index;

	if (!hash)
		return NULL;

	index = choose_orig(data, hash->size);
	head = &hash->table[index];

	rcu_read_lock();
	hlist_for_each_entry_rcu(tt_local_entry, node, head, hash_entry) {
		if (!compare_eth(tt_local_entry, data))
			continue;

		tt_local_entry_tmp = tt_local_entry;
		break;
	}
	rcu_read_unlock();

	return tt_local_entry_tmp;
}

static struct tt_global_entry *tt_global_hash_find(struct bat_priv *bat_priv,
						   const void *data)
{
	struct hashtable_t *hash = bat_priv->tt_global_hash;
	struct hlist_head *head;
	struct hlist_node *node;
	struct tt_global_entry *tt_global_entry;
	struct tt_global_entry *tt_global_entry_tmp = NULL;
	int index;

	if (!hash)
		return NULL;

	index = choose_orig(data, hash->size);
	head = &hash->table[index];

	rcu_read_lock();
	hlist_for_each_entry_rcu(tt_global_entry, node, head, hash_entry) {
		if (!compare_eth(tt_global_entry, data))
			continue;

		tt_global_entry_tmp = tt_global_entry;
		break;
	}
	rcu_read_unlock();

	return tt_global_entry_tmp;
}

int tt_local_init(struct bat_priv *bat_priv)
{
	if (bat_priv->tt_local_hash)
		return 1;

	bat_priv->tt_local_hash = hash_new(1024);

	if (!bat_priv->tt_local_hash)
		return 0;

	atomic_set(&bat_priv->tt_local_changed, 0);
	tt_local_start_timer(bat_priv);

	return 1;
}

void tt_local_add(struct net_device *soft_iface, const uint8_t *addr)
{
	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	struct tt_local_entry *tt_local_entry;
	struct tt_global_entry *tt_global_entry;
	int required_bytes;

	spin_lock_bh(&bat_priv->tt_lhash_lock);
	tt_local_entry = tt_local_hash_find(bat_priv, addr);
	spin_unlock_bh(&bat_priv->tt_lhash_lock);

	if (tt_local_entry) {
		tt_local_entry->last_seen = jiffies;
		return;
	}

	/* only announce as many hosts as possible in the batman-packet and
	   space in batman_packet->num_tt That also should give a limit to
	   MAC-flooding. */
	required_bytes = (bat_priv->num_local_tt + 1) * ETH_ALEN;
	required_bytes += BAT_PACKET_LEN;

	if ((required_bytes > ETH_DATA_LEN) ||
	    (atomic_read(&bat_priv->aggregated_ogms) &&
	     required_bytes > MAX_AGGREGATION_BYTES) ||
	    (bat_priv->num_local_tt + 1 > 255)) {
		bat_dbg(DBG_ROUTES, bat_priv,
			"Can't add new local tt entry (%pM): "
			"number of local tt entries exceeds packet size\n",
			addr);
		return;
	}

	bat_dbg(DBG_ROUTES, bat_priv,
		"Creating new local tt entry: %pM\n", addr);

	tt_local_entry = kmalloc(sizeof(struct tt_local_entry), GFP_ATOMIC);
	if (!tt_local_entry)
		return;

	memcpy(tt_local_entry->addr, addr, ETH_ALEN);
	tt_local_entry->last_seen = jiffies;

	/* the batman interface mac address should never be purged */
	if (compare_eth(addr, soft_iface->dev_addr))
		tt_local_entry->never_purge = 1;
	else
		tt_local_entry->never_purge = 0;

	spin_lock_bh(&bat_priv->tt_lhash_lock);

	hash_add(bat_priv->tt_local_hash, compare_ltt, choose_orig,
		 tt_local_entry, &tt_local_entry->hash_entry);
	bat_priv->num_local_tt++;
	atomic_set(&bat_priv->tt_local_changed, 1);

	spin_unlock_bh(&bat_priv->tt_lhash_lock);

	/* remove address from global hash if present */
	spin_lock_bh(&bat_priv->tt_ghash_lock);

	tt_global_entry = tt_global_hash_find(bat_priv, addr);

	if (tt_global_entry)
		_tt_global_del_orig(bat_priv, tt_global_entry,
				     "local tt received");

	spin_unlock_bh(&bat_priv->tt_ghash_lock);
}

int tt_local_fill_buffer(struct bat_priv *bat_priv,
			  unsigned char *buff, int buff_len)
{
	struct hashtable_t *hash = bat_priv->tt_local_hash;
	struct tt_local_entry *tt_local_entry;
	struct hlist_node *node;
	struct hlist_head *head;
	int i, count = 0;

	spin_lock_bh(&bat_priv->tt_lhash_lock);

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_local_entry, node,
					 head, hash_entry) {
			if (buff_len < (count + 1) * ETH_ALEN)
				break;

			memcpy(buff + (count * ETH_ALEN), tt_local_entry->addr,
			       ETH_ALEN);

			count++;
		}
		rcu_read_unlock();
	}

	/* if we did not get all new local tts see you next time  ;-) */
	if (count == bat_priv->num_local_tt)
		atomic_set(&bat_priv->tt_local_changed, 0);

	spin_unlock_bh(&bat_priv->tt_lhash_lock);
	return count;
}

int tt_local_seq_print_text(struct seq_file *seq, void *offset)
{
	struct net_device *net_dev = (struct net_device *)seq->private;
	struct bat_priv *bat_priv = netdev_priv(net_dev);
	struct hashtable_t *hash = bat_priv->tt_local_hash;
	struct tt_local_entry *tt_local_entry;
	struct hard_iface *primary_if;
	struct hlist_node *node;
	struct hlist_head *head;
	size_t buf_size, pos;
	char *buff;
	int i, ret = 0;

	primary_if = primary_if_get_selected(bat_priv);
	if (!primary_if) {
		ret = seq_printf(seq, "BATMAN mesh %s disabled - "
				 "please specify interfaces to enable it\n",
				 net_dev->name);
		goto out;
	}

	if (primary_if->if_status != IF_ACTIVE) {
		ret = seq_printf(seq, "BATMAN mesh %s disabled - "
				 "primary interface not active\n",
				 net_dev->name);
		goto out;
	}

	seq_printf(seq, "Locally retrieved addresses (from %s) "
		   "announced via TT:\n",
		   net_dev->name);

	spin_lock_bh(&bat_priv->tt_lhash_lock);

	buf_size = 1;
	/* Estimate length for: " * xx:xx:xx:xx:xx:xx\n" */
	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		__hlist_for_each_rcu(node, head)
			buf_size += 21;
		rcu_read_unlock();
	}

	buff = kmalloc(buf_size, GFP_ATOMIC);
	if (!buff) {
		spin_unlock_bh(&bat_priv->tt_lhash_lock);
		ret = -ENOMEM;
		goto out;
	}

	buff[0] = '\0';
	pos = 0;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_local_entry, node,
					 head, hash_entry) {
			pos += snprintf(buff + pos, 22, " * %pM\n",
					tt_local_entry->addr);
		}
		rcu_read_unlock();
	}

	spin_unlock_bh(&bat_priv->tt_lhash_lock);

	seq_printf(seq, "%s", buff);
	kfree(buff);
out:
	if (primary_if)
		hardif_free_ref(primary_if);
	return ret;
}

static void _tt_local_del(struct hlist_node *node, void *arg)
{
	struct bat_priv *bat_priv = arg;
	void *data = container_of(node, struct tt_local_entry, hash_entry);

	kfree(data);
	bat_priv->num_local_tt--;
	atomic_set(&bat_priv->tt_local_changed, 1);
}

static void tt_local_del(struct bat_priv *bat_priv,
			 struct tt_local_entry *tt_local_entry,
			 const char *message)
{
	bat_dbg(DBG_ROUTES, bat_priv, "Deleting local tt entry (%pM): %s\n",
		tt_local_entry->addr, message);

	hash_remove(bat_priv->tt_local_hash, compare_ltt, choose_orig,
		    tt_local_entry->addr);
	_tt_local_del(&tt_local_entry->hash_entry, bat_priv);
}

void tt_local_remove(struct bat_priv *bat_priv,
		     const uint8_t *addr, const char *message)
{
	struct tt_local_entry *tt_local_entry;

	spin_lock_bh(&bat_priv->tt_lhash_lock);

	tt_local_entry = tt_local_hash_find(bat_priv, addr);

	if (tt_local_entry)
		tt_local_del(bat_priv, tt_local_entry, message);

	spin_unlock_bh(&bat_priv->tt_lhash_lock);
}

static void tt_local_purge(struct work_struct *work)
{
	struct delayed_work *delayed_work =
		container_of(work, struct delayed_work, work);
	struct bat_priv *bat_priv =
		container_of(delayed_work, struct bat_priv, tt_work);
	struct hashtable_t *hash = bat_priv->tt_local_hash;
	struct tt_local_entry *tt_local_entry;
	struct hlist_node *node, *node_tmp;
	struct hlist_head *head;
	unsigned long timeout;
	int i;

	spin_lock_bh(&bat_priv->tt_lhash_lock);

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		hlist_for_each_entry_safe(tt_local_entry, node, node_tmp,
					  head, hash_entry) {
			if (tt_local_entry->never_purge)
				continue;

			timeout = tt_local_entry->last_seen;
			timeout += TT_LOCAL_TIMEOUT * HZ;

			if (time_before(jiffies, timeout))
				continue;

			tt_local_del(bat_priv, tt_local_entry,
				      "address timed out");
		}
	}

	spin_unlock_bh(&bat_priv->tt_lhash_lock);
	tt_local_start_timer(bat_priv);
}

void tt_local_free(struct bat_priv *bat_priv)
{
	if (!bat_priv->tt_local_hash)
		return;

	cancel_delayed_work_sync(&bat_priv->tt_work);
	hash_delete(bat_priv->tt_local_hash, _tt_local_del, bat_priv);
	bat_priv->tt_local_hash = NULL;
}

int tt_global_init(struct bat_priv *bat_priv)
{
	if (bat_priv->tt_global_hash)
		return 1;

	bat_priv->tt_global_hash = hash_new(1024);

	if (!bat_priv->tt_global_hash)
		return 0;

	return 1;
}

void tt_global_add_orig(struct bat_priv *bat_priv,
			 struct orig_node *orig_node,
			 const unsigned char *tt_buff, int tt_buff_len)
{
	struct tt_global_entry *tt_global_entry;
	struct tt_local_entry *tt_local_entry;
	int tt_buff_count = 0;
	const unsigned char *tt_ptr;

	while ((tt_buff_count + 1) * ETH_ALEN <= tt_buff_len) {
		spin_lock_bh(&bat_priv->tt_ghash_lock);

		tt_ptr = tt_buff + (tt_buff_count * ETH_ALEN);
		tt_global_entry = tt_global_hash_find(bat_priv, tt_ptr);

		if (!tt_global_entry) {
			spin_unlock_bh(&bat_priv->tt_ghash_lock);

			tt_global_entry =
				kmalloc(sizeof(struct tt_global_entry),
					GFP_ATOMIC);

			if (!tt_global_entry)
				break;

			memcpy(tt_global_entry->addr, tt_ptr, ETH_ALEN);

			bat_dbg(DBG_ROUTES, bat_priv,
				"Creating new global tt entry: "
				"%pM (via %pM)\n",
				tt_global_entry->addr, orig_node->orig);

			spin_lock_bh(&bat_priv->tt_ghash_lock);
			hash_add(bat_priv->tt_global_hash, compare_gtt,
				 choose_orig, tt_global_entry,
				 &tt_global_entry->hash_entry);

		}

		tt_global_entry->orig_node = orig_node;
		spin_unlock_bh(&bat_priv->tt_ghash_lock);

		/* remove address from local hash if present */
		spin_lock_bh(&bat_priv->tt_lhash_lock);

		tt_ptr = tt_buff + (tt_buff_count * ETH_ALEN);
		tt_local_entry = tt_local_hash_find(bat_priv, tt_ptr);

		if (tt_local_entry)
			tt_local_del(bat_priv, tt_local_entry,
				      "global tt received");

		spin_unlock_bh(&bat_priv->tt_lhash_lock);

		tt_buff_count++;
	}

	/* initialize, and overwrite if malloc succeeds */
	orig_node->tt_buff = NULL;
	orig_node->tt_buff_len = 0;

	if (tt_buff_len > 0) {
		orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
		if (orig_node->tt_buff) {
			memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
			orig_node->tt_buff_len = tt_buff_len;
		}
	}
}

int tt_global_seq_print_text(struct seq_file *seq, void *offset)
{
	struct net_device *net_dev = (struct net_device *)seq->private;
	struct bat_priv *bat_priv = netdev_priv(net_dev);
	struct hashtable_t *hash = bat_priv->tt_global_hash;
	struct tt_global_entry *tt_global_entry;
	struct hard_iface *primary_if;
	struct hlist_node *node;
	struct hlist_head *head;
	size_t buf_size, pos;
	char *buff;
	int i, ret = 0;

	primary_if = primary_if_get_selected(bat_priv);
	if (!primary_if) {
		ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
				 "specify interfaces to enable it\n",
				 net_dev->name);
		goto out;
	}

	if (primary_if->if_status != IF_ACTIVE) {
		ret = seq_printf(seq, "BATMAN mesh %s disabled - "
				 "primary interface not active\n",
				 net_dev->name);
		goto out;
	}

	seq_printf(seq,
		   "Globally announced TT entries received via the mesh %s\n",
		   net_dev->name);

	spin_lock_bh(&bat_priv->tt_ghash_lock);

	buf_size = 1;
	/* Estimate length for: " * xx:xx:xx:xx:xx:xx via xx:xx:xx:xx:xx:xx\n"*/
	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		__hlist_for_each_rcu(node, head)
			buf_size += 43;
		rcu_read_unlock();
	}

	buff = kmalloc(buf_size, GFP_ATOMIC);
	if (!buff) {
		spin_unlock_bh(&bat_priv->tt_ghash_lock);
		ret = -ENOMEM;
		goto out;
	}
	buff[0] = '\0';
	pos = 0;

	for (i = 0; i < hash->size; i++) {
		head = &hash->table[i];

		rcu_read_lock();
		hlist_for_each_entry_rcu(tt_global_entry, node,
					 head, hash_entry) {
			pos += snprintf(buff + pos, 44,
					" * %pM via %pM\n",
					tt_global_entry->addr,
					tt_global_entry->orig_node->orig);
		}
		rcu_read_unlock();
	}

	spin_unlock_bh(&bat_priv->tt_ghash_lock);

	seq_printf(seq, "%s", buff);
	kfree(buff);
out:
	if (primary_if)
		hardif_free_ref(primary_if);
	return ret;
}

static void _tt_global_del_orig(struct bat_priv *bat_priv,
				 struct tt_global_entry *tt_global_entry,
				 const char *message)
{
	bat_dbg(DBG_ROUTES, bat_priv,
		"Deleting global tt entry %pM (via %pM): %s\n",
		tt_global_entry->addr, tt_global_entry->orig_node->orig,
		message);

	hash_remove(bat_priv->tt_global_hash, compare_gtt, choose_orig,
		    tt_global_entry->addr);
	kfree(tt_global_entry);
}

void tt_global_del_orig(struct bat_priv *bat_priv,
			 struct orig_node *orig_node, const char *message)
{
	struct tt_global_entry *tt_global_entry;
	int tt_buff_count = 0;
	unsigned char *tt_ptr;

	if (orig_node->tt_buff_len == 0)
		return;

	spin_lock_bh(&bat_priv->tt_ghash_lock);

	while ((tt_buff_count + 1) * ETH_ALEN <= orig_node->tt_buff_len) {
		tt_ptr = orig_node->tt_buff + (tt_buff_count * ETH_ALEN);
		tt_global_entry = tt_global_hash_find(bat_priv, tt_ptr);

		if ((tt_global_entry) &&
		    (tt_global_entry->orig_node == orig_node))
			_tt_global_del_orig(bat_priv, tt_global_entry,
					     message);

		tt_buff_count++;
	}

	spin_unlock_bh(&bat_priv->tt_ghash_lock);

	orig_node->tt_buff_len = 0;
	kfree(orig_node->tt_buff);
	orig_node->tt_buff = NULL;
}

static void tt_global_del(struct hlist_node *node, void *arg)
{
	void *data = container_of(node, struct tt_global_entry, hash_entry);

	kfree(data);
}

void tt_global_free(struct bat_priv *bat_priv)
{
	if (!bat_priv->tt_global_hash)
		return;

	hash_delete(bat_priv->tt_global_hash, tt_global_del, NULL);
	bat_priv->tt_global_hash = NULL;
}

struct orig_node *transtable_search(struct bat_priv *bat_priv,
				    const uint8_t *addr)
{
	struct tt_global_entry *tt_global_entry;
	struct orig_node *orig_node = NULL;

	spin_lock_bh(&bat_priv->tt_ghash_lock);
	tt_global_entry = tt_global_hash_find(bat_priv, addr);

	if (!tt_global_entry)
		goto out;

	if (!atomic_inc_not_zero(&tt_global_entry->orig_node->refcount))
		goto out;

	orig_node = tt_global_entry->orig_node;

out:
	spin_unlock_bh(&bat_priv->tt_ghash_lock);
	return orig_node;
}