summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/translation-table.c
blob: b25e4b328dcb75ce932327c5bf140fae842c6a9d (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
/*
 * 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 "hash.h"
#include "originator.h"

static void hna_local_purge(struct work_struct *work);
static void _hna_global_del_orig(struct bat_priv *bat_priv,
				 struct hna_global_entry *hna_global_entry,
				 char *message);

static void hna_local_start_timer(struct bat_priv *bat_priv)
{
	INIT_DELAYED_WORK(&bat_priv->hna_work, hna_local_purge);
	queue_delayed_work(bat_event_workqueue, &bat_priv->hna_work, 10 * HZ);
}

int hna_local_init(struct bat_priv *bat_priv)
{
	if (bat_priv->hna_local_hash)
		return 1;

	bat_priv->hna_local_hash = hash_new(1024);

	if (!bat_priv->hna_local_hash)
		return 0;

	atomic_set(&bat_priv->hna_local_changed, 0);
	hna_local_start_timer(bat_priv);

	return 1;
}

void hna_local_add(struct net_device *soft_iface, uint8_t *addr)
{
	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	struct hna_local_entry *hna_local_entry;
	struct hna_global_entry *hna_global_entry;
	int required_bytes;

	spin_lock_bh(&bat_priv->hna_lhash_lock);
	rcu_read_lock();
	hna_local_entry =
		((struct hna_local_entry *)hash_find(bat_priv->hna_local_hash,
						     compare_orig, choose_orig,
						     addr));
	rcu_read_unlock();
	spin_unlock_bh(&bat_priv->hna_lhash_lock);

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

	/* only announce as many hosts as possible in the batman-packet and
	   space in batman_packet->num_hna That also should give a limit to
	   MAC-flooding. */
	required_bytes = (bat_priv->num_local_hna + 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_hna + 1 > 255)) {
		bat_dbg(DBG_ROUTES, bat_priv,
			"Can't add new local hna entry (%pM): "
			"number of local hna entries exceeds packet size\n",
			addr);
		return;
	}

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

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

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

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

	spin_lock_bh(&bat_priv->hna_lhash_lock);

	hash_add(bat_priv->hna_local_hash, compare_orig, choose_orig,
		 hna_local_entry);
	bat_priv->num_local_hna++;
	atomic_set(&bat_priv->hna_local_changed, 1);

	spin_unlock_bh(&bat_priv->hna_lhash_lock);

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

	rcu_read_lock();
	hna_global_entry = ((struct hna_global_entry *)
				hash_find(bat_priv->hna_global_hash,
					  compare_orig, choose_orig, addr));
	rcu_read_unlock();

	if (hna_global_entry)
		_hna_global_del_orig(bat_priv, hna_global_entry,
				     "local hna received");

	spin_unlock_bh(&bat_priv->hna_ghash_lock);
}

int hna_local_fill_buffer(struct bat_priv *bat_priv,
			  unsigned char *buff, int buff_len)
{
	struct hashtable_t *hash = bat_priv->hna_local_hash;
	struct hna_local_entry *hna_local_entry;
	struct element_t *bucket;
	int i;
	struct hlist_node *walk;
	struct hlist_head *head;
	int count = 0;

	spin_lock_bh(&bat_priv->hna_lhash_lock);

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

		hlist_for_each_entry(bucket, walk, head, hlist) {

			if (buff_len < (count + 1) * ETH_ALEN)
				break;

			hna_local_entry = bucket->data;
			memcpy(buff + (count * ETH_ALEN), hna_local_entry->addr,
			       ETH_ALEN);

			count++;
		}
	}

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

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

int hna_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->hna_local_hash;
	struct hna_local_entry *hna_local_entry;
	int i;
	struct hlist_node *walk;
	struct hlist_head *head;
	struct element_t *bucket;
	size_t buf_size, pos;
	char *buff;

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

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

	spin_lock_bh(&bat_priv->hna_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];

		hlist_for_each(walk, head)
			buf_size += 21;
	}

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

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

		hlist_for_each_entry(bucket, walk, head, hlist) {
			hna_local_entry = bucket->data;

			pos += snprintf(buff + pos, 22, " * %pM\n",
					hna_local_entry->addr);
		}
	}

	spin_unlock_bh(&bat_priv->hna_lhash_lock);

	seq_printf(seq, "%s", buff);
	kfree(buff);
	return 0;
}

static void _hna_local_del(void *data, void *arg)
{
	struct bat_priv *bat_priv = (struct bat_priv *)arg;

	kfree(data);
	bat_priv->num_local_hna--;
	atomic_set(&bat_priv->hna_local_changed, 1);
}

static void hna_local_del(struct bat_priv *bat_priv,
			  struct hna_local_entry *hna_local_entry,
			  char *message)
{
	bat_dbg(DBG_ROUTES, bat_priv, "Deleting local hna entry (%pM): %s\n",
		hna_local_entry->addr, message);

	hash_remove(bat_priv->hna_local_hash, compare_orig, choose_orig,
		    hna_local_entry->addr);
	_hna_local_del(hna_local_entry, bat_priv);
}

void hna_local_remove(struct bat_priv *bat_priv,
		      uint8_t *addr, char *message)
{
	struct hna_local_entry *hna_local_entry;

	spin_lock_bh(&bat_priv->hna_lhash_lock);

	rcu_read_lock();
	hna_local_entry = (struct hna_local_entry *)
		hash_find(bat_priv->hna_local_hash, compare_orig, choose_orig,
			  addr);
	rcu_read_unlock();

	if (hna_local_entry)
		hna_local_del(bat_priv, hna_local_entry, message);

	spin_unlock_bh(&bat_priv->hna_lhash_lock);
}

static void hna_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, hna_work);
	struct hashtable_t *hash = bat_priv->hna_local_hash;
	struct hna_local_entry *hna_local_entry;
	int i;
	struct hlist_node *walk, *safe;
	struct hlist_head *head;
	struct element_t *bucket;
	unsigned long timeout;

	spin_lock_bh(&bat_priv->hna_lhash_lock);

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

		hlist_for_each_entry_safe(bucket, walk, safe, head, hlist) {
			hna_local_entry = bucket->data;

			timeout = hna_local_entry->last_seen;
			timeout += LOCAL_HNA_TIMEOUT * HZ;

			if ((!hna_local_entry->never_purge) &&
			    time_after(jiffies, timeout))
				hna_local_del(bat_priv, hna_local_entry,
					"address timed out");
		}
	}

	spin_unlock_bh(&bat_priv->hna_lhash_lock);
	hna_local_start_timer(bat_priv);
}

void hna_local_free(struct bat_priv *bat_priv)
{
	if (!bat_priv->hna_local_hash)
		return;

	cancel_delayed_work_sync(&bat_priv->hna_work);
	hash_delete(bat_priv->hna_local_hash, _hna_local_del, bat_priv);
	bat_priv->hna_local_hash = NULL;
}

int hna_global_init(struct bat_priv *bat_priv)
{
	if (bat_priv->hna_global_hash)
		return 1;

	bat_priv->hna_global_hash = hash_new(1024);

	if (!bat_priv->hna_global_hash)
		return 0;

	return 1;
}

void hna_global_add_orig(struct bat_priv *bat_priv,
			 struct orig_node *orig_node,
			 unsigned char *hna_buff, int hna_buff_len)
{
	struct hna_global_entry *hna_global_entry;
	struct hna_local_entry *hna_local_entry;
	int hna_buff_count = 0;
	unsigned char *hna_ptr;

	while ((hna_buff_count + 1) * ETH_ALEN <= hna_buff_len) {
		spin_lock_bh(&bat_priv->hna_ghash_lock);

		hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
		rcu_read_lock();
		hna_global_entry = (struct hna_global_entry *)
			hash_find(bat_priv->hna_global_hash, compare_orig,
				  choose_orig, hna_ptr);
		rcu_read_unlock();

		if (!hna_global_entry) {
			spin_unlock_bh(&bat_priv->hna_ghash_lock);

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

			if (!hna_global_entry)
				break;

			memcpy(hna_global_entry->addr, hna_ptr, ETH_ALEN);

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

			spin_lock_bh(&bat_priv->hna_ghash_lock);
			hash_add(bat_priv->hna_global_hash, compare_orig,
				 choose_orig, hna_global_entry);

		}

		hna_global_entry->orig_node = orig_node;
		spin_unlock_bh(&bat_priv->hna_ghash_lock);

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

		hna_ptr = hna_buff + (hna_buff_count * ETH_ALEN);
		rcu_read_lock();
		hna_local_entry = (struct hna_local_entry *)
			hash_find(bat_priv->hna_local_hash, compare_orig,
				  choose_orig, hna_ptr);
		rcu_read_unlock();

		if (hna_local_entry)
			hna_local_del(bat_priv, hna_local_entry,
				      "global hna received");

		spin_unlock_bh(&bat_priv->hna_lhash_lock);

		hna_buff_count++;
	}

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

	if (hna_buff_len > 0) {
		orig_node->hna_buff = kmalloc(hna_buff_len, GFP_ATOMIC);
		if (orig_node->hna_buff) {
			memcpy(orig_node->hna_buff, hna_buff, hna_buff_len);
			orig_node->hna_buff_len = hna_buff_len;
		}
	}
}

int hna_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->hna_global_hash;
	struct hna_global_entry *hna_global_entry;
	int i;
	struct hlist_node *walk;
	struct hlist_head *head;
	struct element_t *bucket;
	size_t buf_size, pos;
	char *buff;

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

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

	spin_lock_bh(&bat_priv->hna_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];

		hlist_for_each(walk, head)
			buf_size += 43;
	}

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

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

		hlist_for_each_entry(bucket, walk, head, hlist) {
			hna_global_entry = bucket->data;

			pos += snprintf(buff + pos, 44,
					" * %pM via %pM\n",
					hna_global_entry->addr,
					hna_global_entry->orig_node->orig);
		}
	}

	spin_unlock_bh(&bat_priv->hna_ghash_lock);

	seq_printf(seq, "%s", buff);
	kfree(buff);
	return 0;
}

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

	hash_remove(bat_priv->hna_global_hash, compare_orig, choose_orig,
		    hna_global_entry->addr);
	kfree(hna_global_entry);
}

void hna_global_del_orig(struct bat_priv *bat_priv,
			 struct orig_node *orig_node, char *message)
{
	struct hna_global_entry *hna_global_entry;
	int hna_buff_count = 0;
	unsigned char *hna_ptr;

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

	spin_lock_bh(&bat_priv->hna_ghash_lock);

	while ((hna_buff_count + 1) * ETH_ALEN <= orig_node->hna_buff_len) {
		hna_ptr = orig_node->hna_buff + (hna_buff_count * ETH_ALEN);
		rcu_read_lock();
		hna_global_entry = (struct hna_global_entry *)
			hash_find(bat_priv->hna_global_hash, compare_orig,
				  choose_orig, hna_ptr);
		rcu_read_unlock();

		if ((hna_global_entry) &&
		    (hna_global_entry->orig_node == orig_node))
			_hna_global_del_orig(bat_priv, hna_global_entry,
					     message);

		hna_buff_count++;
	}

	spin_unlock_bh(&bat_priv->hna_ghash_lock);

	orig_node->hna_buff_len = 0;
	kfree(orig_node->hna_buff);
	orig_node->hna_buff = NULL;
}

static void hna_global_del(void *data, void *arg)
{
	kfree(data);
}

void hna_global_free(struct bat_priv *bat_priv)
{
	if (!bat_priv->hna_global_hash)
		return;

	hash_delete(bat_priv->hna_global_hash, hna_global_del, NULL);
	bat_priv->hna_global_hash = NULL;
}

struct orig_node *transtable_search(struct bat_priv *bat_priv, uint8_t *addr)
{
	struct hna_global_entry *hna_global_entry;

	spin_lock_bh(&bat_priv->hna_ghash_lock);
	rcu_read_lock();
	hna_global_entry = (struct hna_global_entry *)
				hash_find(bat_priv->hna_global_hash,
					  compare_orig, choose_orig, addr);
	rcu_read_unlock();
	spin_unlock_bh(&bat_priv->hna_ghash_lock);

	if (!hna_global_entry)
		return NULL;

	return hna_global_entry->orig_node;
}