aboutsummaryrefslogtreecommitdiffstats
path: root/net/batman-adv/soft-interface.c
blob: eeabbb89172ca15f7271897bf08228e1739ae08f (plain) (blame)
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
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
/*
 * 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 "soft-interface.h"
#include "hard-interface.h"
#include "routing.h"
#include "send.h"
#include "bat_debugfs.h"
#include "translation-table.h"
#include "hash.h"
#include "gateway_common.h"
#include "gateway_client.h"
#include "bat_sysfs.h"
#include <linux/slab.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/if_vlan.h>
#include "unicast.h"


static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd);
static void bat_get_drvinfo(struct net_device *dev,
			    struct ethtool_drvinfo *info);
static u32 bat_get_msglevel(struct net_device *dev);
static void bat_set_msglevel(struct net_device *dev, u32 value);
static u32 bat_get_link(struct net_device *dev);

static const struct ethtool_ops bat_ethtool_ops = {
	.get_settings = bat_get_settings,
	.get_drvinfo = bat_get_drvinfo,
	.get_msglevel = bat_get_msglevel,
	.set_msglevel = bat_set_msglevel,
	.get_link = bat_get_link,
};

int my_skb_head_push(struct sk_buff *skb, unsigned int len)
{
	int result;

	/**
	 * TODO: We must check if we can release all references to non-payload
	 * data using skb_header_release in our skbs to allow skb_cow_header to
	 * work optimally. This means that those skbs are not allowed to read
	 * or write any data which is before the current position of skb->data
	 * after that call and thus allow other skbs with the same data buffer
	 * to write freely in that area.
	 */
	result = skb_cow_head(skb, len);
	if (result < 0)
		return result;

	skb_push(skb, len);
	return 0;
}

static void softif_neigh_free_rcu(struct rcu_head *rcu)
{
	struct softif_neigh *softif_neigh;

	softif_neigh = container_of(rcu, struct softif_neigh, rcu);
	kfree(softif_neigh);
}

static void softif_neigh_free_ref(struct softif_neigh *softif_neigh)
{
	if (atomic_dec_and_test(&softif_neigh->refcount))
		call_rcu(&softif_neigh->rcu, softif_neigh_free_rcu);
}

static struct softif_neigh *softif_neigh_get_selected(struct bat_priv *bat_priv)
{
	struct softif_neigh *neigh;

	rcu_read_lock();
	neigh = rcu_dereference(bat_priv->softif_neigh);

	if (neigh && !atomic_inc_not_zero(&neigh->refcount))
		neigh = NULL;

	rcu_read_unlock();
	return neigh;
}

static void softif_neigh_select(struct bat_priv *bat_priv,
				struct softif_neigh *new_neigh)
{
	struct softif_neigh *curr_neigh;

	spin_lock_bh(&bat_priv->softif_neigh_lock);

	if (new_neigh && !atomic_inc_not_zero(&new_neigh->refcount))
		new_neigh = NULL;

	curr_neigh = bat_priv->softif_neigh;
	rcu_assign_pointer(bat_priv->softif_neigh, new_neigh);

	if (curr_neigh)
		softif_neigh_free_ref(curr_neigh);

	spin_unlock_bh(&bat_priv->softif_neigh_lock);
}

static void softif_neigh_deselect(struct bat_priv *bat_priv)
{
	softif_neigh_select(bat_priv, NULL);
}

void softif_neigh_purge(struct bat_priv *bat_priv)
{
	struct softif_neigh *softif_neigh, *curr_softif_neigh;
	struct hlist_node *node, *node_tmp;
	char do_deselect = 0;

	curr_softif_neigh = softif_neigh_get_selected(bat_priv);

	spin_lock_bh(&bat_priv->softif_neigh_lock);

	hlist_for_each_entry_safe(softif_neigh, node, node_tmp,
				  &bat_priv->softif_neigh_list, list) {

		if ((!time_after(jiffies, softif_neigh->last_seen +
				msecs_to_jiffies(SOFTIF_NEIGH_TIMEOUT))) &&
		    (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE))
			continue;

		if (curr_softif_neigh == softif_neigh) {
			bat_dbg(DBG_ROUTES, bat_priv,
				 "Current mesh exit point '%pM' vanished "
				 "(vid: %d).\n",
				 softif_neigh->addr, softif_neigh->vid);
			do_deselect = 1;
		}

		hlist_del_rcu(&softif_neigh->list);
		softif_neigh_free_ref(softif_neigh);
	}

	spin_unlock_bh(&bat_priv->softif_neigh_lock);

	/* soft_neigh_deselect() needs to acquire the softif_neigh_lock */
	if (do_deselect)
		softif_neigh_deselect(bat_priv);

	if (curr_softif_neigh)
		softif_neigh_free_ref(curr_softif_neigh);
}

static struct softif_neigh *softif_neigh_get(struct bat_priv *bat_priv,
					     uint8_t *addr, short vid)
{
	struct softif_neigh *softif_neigh;
	struct hlist_node *node;

	rcu_read_lock();
	hlist_for_each_entry_rcu(softif_neigh, node,
				 &bat_priv->softif_neigh_list, list) {
		if (!compare_eth(softif_neigh->addr, addr))
			continue;

		if (softif_neigh->vid != vid)
			continue;

		if (!atomic_inc_not_zero(&softif_neigh->refcount))
			continue;

		softif_neigh->last_seen = jiffies;
		goto out;
	}

	softif_neigh = kzalloc(sizeof(struct softif_neigh), GFP_ATOMIC);
	if (!softif_neigh)
		goto out;

	memcpy(softif_neigh->addr, addr, ETH_ALEN);
	softif_neigh->vid = vid;
	softif_neigh->last_seen = jiffies;
	/* initialize with 2 - caller decrements counter by one */
	atomic_set(&softif_neigh->refcount, 2);

	INIT_HLIST_NODE(&softif_neigh->list);
	spin_lock_bh(&bat_priv->softif_neigh_lock);
	hlist_add_head_rcu(&softif_neigh->list, &bat_priv->softif_neigh_list);
	spin_unlock_bh(&bat_priv->softif_neigh_lock);

out:
	rcu_read_unlock();
	return softif_neigh;
}

int softif_neigh_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 softif_neigh *softif_neigh;
	struct hlist_node *node;
	struct softif_neigh *curr_softif_neigh;

	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, "Softif neighbor list (%s)\n", net_dev->name);

	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
	rcu_read_lock();
	hlist_for_each_entry_rcu(softif_neigh, node,
				 &bat_priv->softif_neigh_list, list)
		seq_printf(seq, "%s %pM (vid: %d)\n",
				curr_softif_neigh == softif_neigh
				? "=>" : "  ", softif_neigh->addr,
				softif_neigh->vid);
	rcu_read_unlock();
	if (curr_softif_neigh)
		softif_neigh_free_ref(curr_softif_neigh);

	return 0;
}

static void softif_batman_recv(struct sk_buff *skb, struct net_device *dev,
			       short vid)
{
	struct bat_priv *bat_priv = netdev_priv(dev);
	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
	struct batman_packet *batman_packet;
	struct softif_neigh *softif_neigh;
	struct softif_neigh *curr_softif_neigh = NULL;

	if (ntohs(ethhdr->h_proto) == ETH_P_8021Q)
		batman_packet = (struct batman_packet *)
					(skb->data + ETH_HLEN + VLAN_HLEN);
	else
		batman_packet = (struct batman_packet *)(skb->data + ETH_HLEN);

	if (batman_packet->version != COMPAT_VERSION)
		goto err;

	if (batman_packet->packet_type != BAT_PACKET)
		goto err;

	if (!(batman_packet->flags & PRIMARIES_FIRST_HOP))
		goto err;

	if (is_my_mac(batman_packet->orig))
		goto err;

	softif_neigh = softif_neigh_get(bat_priv, batman_packet->orig, vid);

	if (!softif_neigh)
		goto err;

	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
	if (curr_softif_neigh == softif_neigh)
		goto out;

	/* we got a neighbor but its mac is 'bigger' than ours  */
	if (memcmp(bat_priv->primary_if->net_dev->dev_addr,
		   softif_neigh->addr, ETH_ALEN) < 0)
		goto out;

	/* switch to new 'smallest neighbor' */
	if ((curr_softif_neigh) &&
	    (memcmp(softif_neigh->addr, curr_softif_neigh->addr,
							ETH_ALEN) < 0)) {
		bat_dbg(DBG_ROUTES, bat_priv,
			"Changing mesh exit point from %pM (vid: %d) "
			"to %pM (vid: %d).\n",
			 curr_softif_neigh->addr,
			 curr_softif_neigh->vid,
			 softif_neigh->addr, softif_neigh->vid);

		softif_neigh_select(bat_priv, softif_neigh);
		goto out;
	}

	/* close own batX device and use softif_neigh as exit node */
	if ((!curr_softif_neigh) &&
	    (memcmp(softif_neigh->addr,
		    bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN) < 0)) {
		bat_dbg(DBG_ROUTES, bat_priv,
			"Setting mesh exit point to %pM (vid: %d).\n",
			softif_neigh->addr, softif_neigh->vid);

		softif_neigh_select(bat_priv, softif_neigh);
		goto out;
	}

out:
	softif_neigh_free_ref(softif_neigh);
err:
	kfree_skb(skb);
	if (curr_softif_neigh)
		softif_neigh_free_ref(curr_softif_neigh);

	return;
}

static int interface_open(struct net_device *dev)
{
	netif_start_queue(dev);
	return 0;
}

static int interface_release(struct net_device *dev)
{
	netif_stop_queue(dev);
	return 0;
}

static struct net_device_stats *interface_stats(struct net_device *dev)
{
	struct bat_priv *bat_priv = netdev_priv(dev);
	return &bat_priv->stats;
}

static int interface_set_mac_addr(struct net_device *dev, void *p)
{
	struct bat_priv *bat_priv = netdev_priv(dev);
	struct sockaddr *addr = p;

	if (!is_valid_ether_addr(addr->sa_data))
		return -EADDRNOTAVAIL;

	/* only modify hna-table if it has been initialised before */
	if (atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE) {
		hna_local_remove(bat_priv, dev->dev_addr,
				 "mac address changed");
		hna_local_add(dev, addr->sa_data);
	}

	memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
	return 0;
}

static int interface_change_mtu(struct net_device *dev, int new_mtu)
{
	/* check ranges */
	if ((new_mtu < 68) || (new_mtu > hardif_min_mtu(dev)))
		return -EINVAL;

	dev->mtu = new_mtu;

	return 0;
}

int interface_tx(struct sk_buff *skb, struct net_device *soft_iface)
{
	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	struct bcast_packet *bcast_packet;
	struct vlan_ethhdr *vhdr;
	struct softif_neigh *curr_softif_neigh = NULL;
	int data_len = skb->len, ret;
	short vid = -1;
	bool do_bcast = false;

	if (atomic_read(&bat_priv->mesh_state) != MESH_ACTIVE)
		goto dropped;

	soft_iface->trans_start = jiffies;

	switch (ntohs(ethhdr->h_proto)) {
	case ETH_P_8021Q:
		vhdr = (struct vlan_ethhdr *)skb->data;
		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;

		if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
			break;

		/* fall through */
	case ETH_P_BATMAN:
		softif_batman_recv(skb, soft_iface, vid);
		goto end;
	}

	/**
	 * if we have a another chosen mesh exit node in range
	 * it will transport the packets to the mesh
	 */
	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
	if ((curr_softif_neigh) && (curr_softif_neigh->vid == vid))
		goto dropped;

	/* TODO: check this for locks */
	hna_local_add(soft_iface, ethhdr->h_source);

	if (is_multicast_ether_addr(ethhdr->h_dest)) {
		ret = gw_is_target(bat_priv, skb);

		if (ret < 0)
			goto dropped;

		if (ret == 0)
			do_bcast = true;
	}

	/* ethernet packet should be broadcasted */
	if (do_bcast) {
		if (!bat_priv->primary_if)
			goto dropped;

		if (my_skb_head_push(skb, sizeof(struct bcast_packet)) < 0)
			goto dropped;

		bcast_packet = (struct bcast_packet *)skb->data;
		bcast_packet->version = COMPAT_VERSION;
		bcast_packet->ttl = TTL;

		/* batman packet type: broadcast */
		bcast_packet->packet_type = BAT_BCAST;

		/* hw address of first interface is the orig mac because only
		 * this mac is known throughout the mesh */
		memcpy(bcast_packet->orig,
		       bat_priv->primary_if->net_dev->dev_addr, ETH_ALEN);

		/* set broadcast sequence number */
		bcast_packet->seqno =
			htonl(atomic_inc_return(&bat_priv->bcast_seqno));

		add_bcast_packet_to_list(bat_priv, skb);

		/* a copy is stored in the bcast list, therefore removing
		 * the original skb. */
		kfree_skb(skb);

	/* unicast packet */
	} else {
		ret = unicast_send_skb(skb, bat_priv);
		if (ret != 0)
			goto dropped_freed;
	}

	bat_priv->stats.tx_packets++;
	bat_priv->stats.tx_bytes += data_len;
	goto end;

dropped:
	kfree_skb(skb);
dropped_freed:
	bat_priv->stats.tx_dropped++;
end:
	if (curr_softif_neigh)
		softif_neigh_free_ref(curr_softif_neigh);
	return NETDEV_TX_OK;
}

void interface_rx(struct net_device *soft_iface,
		  struct sk_buff *skb, struct hard_iface *recv_if,
		  int hdr_size)
{
	struct bat_priv *bat_priv = netdev_priv(soft_iface);
	struct unicast_packet *unicast_packet;
	struct ethhdr *ethhdr;
	struct vlan_ethhdr *vhdr;
	struct softif_neigh *curr_softif_neigh = NULL;
	short vid = -1;
	int ret;

	/* check if enough space is available for pulling, and pull */
	if (!pskb_may_pull(skb, hdr_size))
		goto dropped;

	skb_pull_rcsum(skb, hdr_size);
	skb_reset_mac_header(skb);

	ethhdr = (struct ethhdr *)skb_mac_header(skb);

	switch (ntohs(ethhdr->h_proto)) {
	case ETH_P_8021Q:
		vhdr = (struct vlan_ethhdr *)skb->data;
		vid = ntohs(vhdr->h_vlan_TCI) & VLAN_VID_MASK;

		if (ntohs(vhdr->h_vlan_encapsulated_proto) != ETH_P_BATMAN)
			break;

		/* fall through */
	case ETH_P_BATMAN:
		goto dropped;
	}

	/**
	 * if we have a another chosen mesh exit node in range
	 * it will transport the packets to the non-mesh network
	 */
	curr_softif_neigh = softif_neigh_get_selected(bat_priv);
	if (curr_softif_neigh && (curr_softif_neigh->vid == vid)) {
		skb_push(skb, hdr_size);
		unicast_packet = (struct unicast_packet *)skb->data;

		if ((unicast_packet->packet_type != BAT_UNICAST) &&
		    (unicast_packet->packet_type != BAT_UNICAST_FRAG))
			goto dropped;

		skb_reset_mac_header(skb);

		memcpy(unicast_packet->dest,
		       curr_softif_neigh->addr, ETH_ALEN);
		ret = route_unicast_packet(skb, recv_if);
		if (ret == NET_RX_DROP)
			goto dropped;

		goto out;
	}

	/* skb->dev & skb->pkt_type are set here */
	if (unlikely(!pskb_may_pull(skb, ETH_HLEN)))
		goto dropped;
	skb->protocol = eth_type_trans(skb, soft_iface);

	/* should not be necessary anymore as we use skb_pull_rcsum()
	 * TODO: please verify this and remove this TODO
	 * -- Dec 21st 2009, Simon Wunderlich */

/*	skb->ip_summed = CHECKSUM_UNNECESSARY;*/

	bat_priv->stats.rx_packets++;
	bat_priv->stats.rx_bytes += skb->len + sizeof(struct ethhdr);

	soft_iface->last_rx = jiffies;

	netif_rx(skb);
	goto out;

dropped:
	kfree_skb(skb);
out:
	if (curr_softif_neigh)
		softif_neigh_free_ref(curr_softif_neigh);
	return;
}

#ifdef HAVE_NET_DEVICE_OPS
static const struct net_device_ops bat_netdev_ops = {
	.ndo_open = interface_open,
	.ndo_stop = interface_release,
	.ndo_get_stats = interface_stats,
	.ndo_set_mac_address = interface_set_mac_addr,
	.ndo_change_mtu = interface_change_mtu,
	.ndo_start_xmit = interface_tx,
	.ndo_validate_addr = eth_validate_addr
};
#endif

static void interface_setup(struct net_device *dev)
{
	struct bat_priv *priv = netdev_priv(dev);
	char dev_addr[ETH_ALEN];

	ether_setup(dev);

#ifdef HAVE_NET_DEVICE_OPS
	dev->netdev_ops = &bat_netdev_ops;
#else
	dev->open = interface_open;
	dev->stop = interface_release;
	dev->get_stats = interface_stats;
	dev->set_mac_address = interface_set_mac_addr;
	dev->change_mtu = interface_change_mtu;
	dev->hard_start_xmit = interface_tx;
#endif
	dev->destructor = free_netdev;
	dev->tx_queue_len = 0;

	/**
	 * can't call min_mtu, because the needed variables
	 * have not been initialized yet
	 */
	dev->mtu = ETH_DATA_LEN;
	dev->hard_header_len = BAT_HEADER_LEN; /* reserve more space in the
						* skbuff for our header */

	/* generate random address */
	random_ether_addr(dev_addr);
	memcpy(dev->dev_addr, dev_addr, ETH_ALEN);

	SET_ETHTOOL_OPS(dev, &bat_ethtool_ops);

	memset(priv, 0, sizeof(struct bat_priv));
}

struct net_device *softif_create(char *name)
{
	struct net_device *soft_iface;
	struct bat_priv *bat_priv;
	int ret;

	soft_iface = alloc_netdev(sizeof(struct bat_priv) , name,
				   interface_setup);

	if (!soft_iface) {
		pr_err("Unable to allocate the batman interface: %s\n", name);
		goto out;
	}

	ret = register_netdev(soft_iface);
	if (ret < 0) {
		pr_err("Unable to register the batman interface '%s': %i\n",
		       name, ret);
		goto free_soft_iface;
	}

	bat_priv = netdev_priv(soft_iface);

	atomic_set(&bat_priv->aggregated_ogms, 1);
	atomic_set(&bat_priv->bonding, 0);
	atomic_set(&bat_priv->vis_mode, VIS_TYPE_CLIENT_UPDATE);
	atomic_set(&bat_priv->gw_mode, GW_MODE_OFF);
	atomic_set(&bat_priv->gw_sel_class, 20);
	atomic_set(&bat_priv->gw_bandwidth, 41);
	atomic_set(&bat_priv->orig_interval, 1000);
	atomic_set(&bat_priv->hop_penalty, 10);
	atomic_set(&bat_priv->log_level, 0);
	atomic_set(&bat_priv->fragmentation, 1);
	atomic_set(&bat_priv->bcast_queue_left, BCAST_QUEUE_LEN);
	atomic_set(&bat_priv->batman_queue_left, BATMAN_QUEUE_LEN);

	atomic_set(&bat_priv->mesh_state, MESH_INACTIVE);
	atomic_set(&bat_priv->bcast_seqno, 1);
	atomic_set(&bat_priv->hna_local_changed, 0);

	bat_priv->primary_if = NULL;
	bat_priv->num_ifaces = 0;
	bat_priv->softif_neigh = NULL;

	ret = sysfs_add_meshif(soft_iface);
	if (ret < 0)
		goto unreg_soft_iface;

	ret = debugfs_add_meshif(soft_iface);
	if (ret < 0)
		goto unreg_sysfs;

	ret = mesh_init(soft_iface);
	if (ret < 0)
		goto unreg_debugfs;

	return soft_iface;

unreg_debugfs:
	debugfs_del_meshif(soft_iface);
unreg_sysfs:
	sysfs_del_meshif(soft_iface);
unreg_soft_iface:
	unregister_netdev(soft_iface);
	return NULL;

free_soft_iface:
	free_netdev(soft_iface);
out:
	return NULL;
}

void softif_destroy(struct net_device *soft_iface)
{
	debugfs_del_meshif(soft_iface);
	sysfs_del_meshif(soft_iface);
	mesh_free(soft_iface);
	unregister_netdevice(soft_iface);
}

int softif_is_valid(struct net_device *net_dev)
{
#ifdef HAVE_NET_DEVICE_OPS
	if (net_dev->netdev_ops->ndo_start_xmit == interface_tx)
		return 1;
#else
	if (net_dev->hard_start_xmit == interface_tx)
		return 1;
#endif

	return 0;
}

/* ethtool */
static int bat_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	cmd->supported = 0;
	cmd->advertising = 0;
	ethtool_cmd_speed_set(cmd, SPEED_10);
	cmd->duplex = DUPLEX_FULL;
	cmd->port = PORT_TP;
	cmd->phy_address = 0;
	cmd->transceiver = XCVR_INTERNAL;
	cmd->autoneg = AUTONEG_DISABLE;
	cmd->maxtxpkt = 0;
	cmd->maxrxpkt = 0;

	return 0;
}

static void bat_get_drvinfo(struct net_device *dev,
			    struct ethtool_drvinfo *info)
{
	strcpy(info->driver, "B.A.T.M.A.N. advanced");
	strcpy(info->version, SOURCE_VERSION);
	strcpy(info->fw_version, "N/A");
	strcpy(info->bus_info, "batman");
}

static u32 bat_get_msglevel(struct net_device *dev)
{
	return -EOPNOTSUPP;
}

static void bat_set_msglevel(struct net_device *dev, u32 value)
{
}

static u32 bat_get_link(struct net_device *dev)
{
	return 1;
}