summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/send.c
blob: 3ce06e0a91b1c125cdf5ff594db57529a2deaacf (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
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
/* Copyright (C) 2007-2016  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, see <http://www.gnu.org/licenses/>.
 */

#include "send.h"
#include "main.h"

#include <linux/atomic.h>
#include <linux/byteorder/generic.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/if.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/printk.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/workqueue.h>

#include "distributed-arp-table.h"
#include "fragmentation.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "network-coding.h"
#include "originator.h"
#include "routing.h"
#include "soft-interface.h"
#include "translation-table.h"

static void batadv_send_outstanding_bcast_packet(struct work_struct *work);

/**
 * batadv_send_skb_packet - send an already prepared packet
 * @skb: the packet to send
 * @hard_iface: the interface to use to send the broadcast packet
 * @dst_addr: the payload destination
 *
 * Send out an already prepared packet to the given neighbor or broadcast it
 * using the specified interface. Either hard_iface or neigh_node must be not
 * NULL.
 * If neigh_node is NULL, then the packet is broadcasted using hard_iface,
 * otherwise it is sent as unicast to the given neighbor.
 *
 * Return: NET_TX_DROP in case of error or the result of dev_queue_xmit(skb)
 * otherwise
 */
int batadv_send_skb_packet(struct sk_buff *skb,
			   struct batadv_hard_iface *hard_iface,
			   const u8 *dst_addr)
{
	struct batadv_priv *bat_priv;
	struct ethhdr *ethhdr;

	bat_priv = netdev_priv(hard_iface->soft_iface);

	if (hard_iface->if_status != BATADV_IF_ACTIVE)
		goto send_skb_err;

	if (unlikely(!hard_iface->net_dev))
		goto send_skb_err;

	if (!(hard_iface->net_dev->flags & IFF_UP)) {
		pr_warn("Interface %s is not up - can't send packet via that interface!\n",
			hard_iface->net_dev->name);
		goto send_skb_err;
	}

	/* push to the ethernet header. */
	if (batadv_skb_head_push(skb, ETH_HLEN) < 0)
		goto send_skb_err;

	skb_reset_mac_header(skb);

	ethhdr = eth_hdr(skb);
	ether_addr_copy(ethhdr->h_source, hard_iface->net_dev->dev_addr);
	ether_addr_copy(ethhdr->h_dest, dst_addr);
	ethhdr->h_proto = htons(ETH_P_BATMAN);

	skb_set_network_header(skb, ETH_HLEN);
	skb->protocol = htons(ETH_P_BATMAN);

	skb->dev = hard_iface->net_dev;

	/* Save a clone of the skb to use when decoding coded packets */
	batadv_nc_skb_store_for_decoding(bat_priv, skb);

	/* dev_queue_xmit() returns a negative result on error.	 However on
	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
	 * (which is > 0). This will not be treated as an error.
	 */
	return dev_queue_xmit(skb);
send_skb_err:
	kfree_skb(skb);
	return NET_XMIT_DROP;
}

int batadv_send_broadcast_skb(struct sk_buff *skb,
			      struct batadv_hard_iface *hard_iface)
{
	return batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
}

int batadv_send_unicast_skb(struct sk_buff *skb,
			    struct batadv_neigh_node *neigh)
{
#ifdef CONFIG_BATMAN_ADV_BATMAN_V
	struct batadv_hardif_neigh_node *hardif_neigh;
#endif
	int ret;

	ret = batadv_send_skb_packet(skb, neigh->if_incoming, neigh->addr);

#ifdef CONFIG_BATMAN_ADV_BATMAN_V
	hardif_neigh = batadv_hardif_neigh_get(neigh->if_incoming, neigh->addr);

	if ((hardif_neigh) && (ret != NET_XMIT_DROP))
		hardif_neigh->bat_v.last_unicast_tx = jiffies;

	if (hardif_neigh)
		batadv_hardif_neigh_put(hardif_neigh);
#endif

	return ret;
}

/**
 * batadv_send_skb_to_orig - Lookup next-hop and transmit skb.
 * @skb: Packet to be transmitted.
 * @orig_node: Final destination of the packet.
 * @recv_if: Interface used when receiving the packet (can be NULL).
 *
 * Looks up the best next-hop towards the passed originator and passes the
 * skb on for preparation of MAC header. If the packet originated from this
 * host, NULL can be passed as recv_if and no interface alternating is
 * attempted.
 *
 * Return: NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
 * NET_XMIT_POLICED if the skb is buffered for later transmit.
 */
int batadv_send_skb_to_orig(struct sk_buff *skb,
			    struct batadv_orig_node *orig_node,
			    struct batadv_hard_iface *recv_if)
{
	struct batadv_priv *bat_priv = orig_node->bat_priv;
	struct batadv_neigh_node *neigh_node;
	int ret = NET_XMIT_DROP;

	/* batadv_find_router() increases neigh_nodes refcount if found. */
	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
	if (!neigh_node)
		goto out;

	/* Check if the skb is too large to send in one piece and fragment
	 * it if needed.
	 */
	if (atomic_read(&bat_priv->fragmentation) &&
	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
		/* Fragment and send packet. */
		if (batadv_frag_send_packet(skb, orig_node, neigh_node))
			ret = NET_XMIT_SUCCESS;

		goto out;
	}

	/* try to network code the packet, if it is received on an interface
	 * (i.e. being forwarded). If the packet originates from this node or if
	 * network coding fails, then send the packet as usual.
	 */
	if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
		ret = NET_XMIT_POLICED;
	} else {
		batadv_send_unicast_skb(skb, neigh_node);
		ret = NET_XMIT_SUCCESS;
	}

out:
	if (neigh_node)
		batadv_neigh_node_put(neigh_node);

	return ret;
}

/**
 * batadv_send_skb_push_fill_unicast - extend the buffer and initialize the
 *  common fields for unicast packets
 * @skb: the skb carrying the unicast header to initialize
 * @hdr_size: amount of bytes to push at the beginning of the skb
 * @orig_node: the destination node
 *
 * Return: false if the buffer extension was not possible or true otherwise.
 */
static bool
batadv_send_skb_push_fill_unicast(struct sk_buff *skb, int hdr_size,
				  struct batadv_orig_node *orig_node)
{
	struct batadv_unicast_packet *unicast_packet;
	u8 ttvn = (u8)atomic_read(&orig_node->last_ttvn);

	if (batadv_skb_head_push(skb, hdr_size) < 0)
		return false;

	unicast_packet = (struct batadv_unicast_packet *)skb->data;
	unicast_packet->version = BATADV_COMPAT_VERSION;
	/* batman packet type: unicast */
	unicast_packet->packet_type = BATADV_UNICAST;
	/* set unicast ttl */
	unicast_packet->ttl = BATADV_TTL;
	/* copy the destination for faster routing */
	ether_addr_copy(unicast_packet->dest, orig_node->orig);
	/* set the destination tt version number */
	unicast_packet->ttvn = ttvn;

	return true;
}

/**
 * batadv_send_skb_prepare_unicast - encapsulate an skb with a unicast header
 * @skb: the skb containing the payload to encapsulate
 * @orig_node: the destination node
 *
 * Return: false if the payload could not be encapsulated or true otherwise.
 */
static bool batadv_send_skb_prepare_unicast(struct sk_buff *skb,
					    struct batadv_orig_node *orig_node)
{
	size_t uni_size = sizeof(struct batadv_unicast_packet);

	return batadv_send_skb_push_fill_unicast(skb, uni_size, orig_node);
}

/**
 * batadv_send_skb_prepare_unicast_4addr - encapsulate an skb with a
 *  unicast 4addr header
 * @bat_priv: the bat priv with all the soft interface information
 * @skb: the skb containing the payload to encapsulate
 * @orig: the destination node
 * @packet_subtype: the unicast 4addr packet subtype to use
 *
 * Return: false if the payload could not be encapsulated or true otherwise.
 */
bool batadv_send_skb_prepare_unicast_4addr(struct batadv_priv *bat_priv,
					   struct sk_buff *skb,
					   struct batadv_orig_node *orig,
					   int packet_subtype)
{
	struct batadv_hard_iface *primary_if;
	struct batadv_unicast_4addr_packet *uc_4addr_packet;
	bool ret = false;

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if)
		goto out;

	/* Pull the header space and fill the unicast_packet substructure.
	 * We can do that because the first member of the uc_4addr_packet
	 * is of type struct unicast_packet
	 */
	if (!batadv_send_skb_push_fill_unicast(skb, sizeof(*uc_4addr_packet),
					       orig))
		goto out;

	uc_4addr_packet = (struct batadv_unicast_4addr_packet *)skb->data;
	uc_4addr_packet->u.packet_type = BATADV_UNICAST_4ADDR;
	ether_addr_copy(uc_4addr_packet->src, primary_if->net_dev->dev_addr);
	uc_4addr_packet->subtype = packet_subtype;
	uc_4addr_packet->reserved = 0;

	ret = true;
out:
	if (primary_if)
		batadv_hardif_put(primary_if);
	return ret;
}

/**
 * batadv_send_skb_unicast - encapsulate and send an skb via unicast
 * @bat_priv: the bat priv with all the soft interface information
 * @skb: payload to send
 * @packet_type: the batman unicast packet type to use
 * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
 *  4addr packets)
 * @orig_node: the originator to send the packet to
 * @vid: the vid to be used to search the translation table
 *
 * Wrap the given skb into a batman-adv unicast or unicast-4addr header
 * depending on whether BATADV_UNICAST or BATADV_UNICAST_4ADDR was supplied
 * as packet_type. Then send this frame to the given orig_node and release a
 * reference to this orig_node.
 *
 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 */
int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
			    struct sk_buff *skb, int packet_type,
			    int packet_subtype,
			    struct batadv_orig_node *orig_node,
			    unsigned short vid)
{
	struct batadv_unicast_packet *unicast_packet;
	struct ethhdr *ethhdr;
	int ret = NET_XMIT_DROP;

	if (!orig_node)
		goto out;

	switch (packet_type) {
	case BATADV_UNICAST:
		if (!batadv_send_skb_prepare_unicast(skb, orig_node))
			goto out;
		break;
	case BATADV_UNICAST_4ADDR:
		if (!batadv_send_skb_prepare_unicast_4addr(bat_priv, skb,
							   orig_node,
							   packet_subtype))
			goto out;
		break;
	default:
		/* this function supports UNICAST and UNICAST_4ADDR only. It
		 * should never be invoked with any other packet type
		 */
		goto out;
	}

	/* skb->data might have been reallocated by
	 * batadv_send_skb_prepare_unicast{,_4addr}()
	 */
	ethhdr = eth_hdr(skb);
	unicast_packet = (struct batadv_unicast_packet *)skb->data;

	/* inform the destination node that we are still missing a correct route
	 * for this client. The destination will receive this packet and will
	 * try to reroute it because the ttvn contained in the header is less
	 * than the current one
	 */
	if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
		unicast_packet->ttvn = unicast_packet->ttvn - 1;

	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
		ret = NET_XMIT_SUCCESS;

out:
	if (orig_node)
		batadv_orig_node_put(orig_node);
	if (ret == NET_XMIT_DROP)
		kfree_skb(skb);
	return ret;
}

/**
 * batadv_send_skb_via_tt_generic - send an skb via TT lookup
 * @bat_priv: the bat priv with all the soft interface information
 * @skb: payload to send
 * @packet_type: the batman unicast packet type to use
 * @packet_subtype: the unicast 4addr packet subtype (only relevant for unicast
 *  4addr packets)
 * @dst_hint: can be used to override the destination contained in the skb
 * @vid: the vid to be used to search the translation table
 *
 * Look up the recipient node for the destination address in the ethernet
 * header via the translation table. Wrap the given skb into a batman-adv
 * unicast or unicast-4addr header depending on whether BATADV_UNICAST or
 * BATADV_UNICAST_4ADDR was supplied as packet_type. Then send this frame
 * to the according destination node.
 *
 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 */
int batadv_send_skb_via_tt_generic(struct batadv_priv *bat_priv,
				   struct sk_buff *skb, int packet_type,
				   int packet_subtype, u8 *dst_hint,
				   unsigned short vid)
{
	struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
	struct batadv_orig_node *orig_node;
	u8 *src, *dst;

	src = ethhdr->h_source;
	dst = ethhdr->h_dest;

	/* if we got an hint! let's send the packet to this client (if any) */
	if (dst_hint) {
		src = NULL;
		dst = dst_hint;
	}
	orig_node = batadv_transtable_search(bat_priv, src, dst, vid);

	return batadv_send_skb_unicast(bat_priv, skb, packet_type,
				       packet_subtype, orig_node, vid);
}

/**
 * batadv_send_skb_via_gw - send an skb via gateway lookup
 * @bat_priv: the bat priv with all the soft interface information
 * @skb: payload to send
 * @vid: the vid to be used to search the translation table
 *
 * Look up the currently selected gateway. Wrap the given skb into a batman-adv
 * unicast header and send this frame to this gateway node.
 *
 * Return: NET_XMIT_DROP in case of error or NET_XMIT_SUCCESS otherwise.
 */
int batadv_send_skb_via_gw(struct batadv_priv *bat_priv, struct sk_buff *skb,
			   unsigned short vid)
{
	struct batadv_orig_node *orig_node;

	orig_node = batadv_gw_get_selected_orig(bat_priv);
	return batadv_send_skb_unicast(bat_priv, skb, BATADV_UNICAST, 0,
				       orig_node, vid);
}

void batadv_schedule_bat_ogm(struct batadv_hard_iface *hard_iface)
{
	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);

	if ((hard_iface->if_status == BATADV_IF_NOT_IN_USE) ||
	    (hard_iface->if_status == BATADV_IF_TO_BE_REMOVED))
		return;

	/* the interface gets activated here to avoid race conditions between
	 * the moment of activating the interface in
	 * hardif_activate_interface() where the originator mac is set and
	 * outdated packets (especially uninitialized mac addresses) in the
	 * packet queue
	 */
	if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
		hard_iface->if_status = BATADV_IF_ACTIVE;

	bat_priv->bat_algo_ops->bat_ogm_schedule(hard_iface);
}

static void batadv_forw_packet_free(struct batadv_forw_packet *forw_packet)
{
	kfree_skb(forw_packet->skb);
	if (forw_packet->if_incoming)
		batadv_hardif_put(forw_packet->if_incoming);
	if (forw_packet->if_outgoing)
		batadv_hardif_put(forw_packet->if_outgoing);
	kfree(forw_packet);
}

static void
_batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
				 struct batadv_forw_packet *forw_packet,
				 unsigned long send_time)
{
	/* add new packet to packet list */
	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
	hlist_add_head(&forw_packet->list, &bat_priv->forw_bcast_list);
	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	/* start timer for this packet */
	queue_delayed_work(batadv_event_workqueue, &forw_packet->delayed_work,
			   send_time);
}

/**
 * batadv_add_bcast_packet_to_list - queue broadcast packet for multiple sends
 * @bat_priv: the bat priv with all the soft interface information
 * @skb: broadcast packet to add
 * @delay: number of jiffies to wait before sending
 *
 * add a broadcast packet to the queue and setup timers. broadcast packets
 * are sent multiple times to increase probability for being received.
 *
 * The skb is not consumed, so the caller should make sure that the
 * skb is freed.
 *
 * Return: NETDEV_TX_OK on success and NETDEV_TX_BUSY on errors.
 */
int batadv_add_bcast_packet_to_list(struct batadv_priv *bat_priv,
				    const struct sk_buff *skb,
				    unsigned long delay)
{
	struct batadv_hard_iface *primary_if = NULL;
	struct batadv_forw_packet *forw_packet;
	struct batadv_bcast_packet *bcast_packet;
	struct sk_buff *newskb;

	if (!batadv_atomic_dec_not_zero(&bat_priv->bcast_queue_left)) {
		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
			   "bcast packet queue full\n");
		goto out;
	}

	primary_if = batadv_primary_if_get_selected(bat_priv);
	if (!primary_if)
		goto out_and_inc;

	forw_packet = kmalloc(sizeof(*forw_packet), GFP_ATOMIC);

	if (!forw_packet)
		goto out_and_inc;

	newskb = skb_copy(skb, GFP_ATOMIC);
	if (!newskb)
		goto packet_free;

	/* as we have a copy now, it is safe to decrease the TTL */
	bcast_packet = (struct batadv_bcast_packet *)newskb->data;
	bcast_packet->ttl--;

	skb_reset_mac_header(newskb);

	forw_packet->skb = newskb;
	forw_packet->if_incoming = primary_if;
	forw_packet->if_outgoing = NULL;

	/* how often did we send the bcast packet ? */
	forw_packet->num_packets = 0;

	INIT_DELAYED_WORK(&forw_packet->delayed_work,
			  batadv_send_outstanding_bcast_packet);

	_batadv_add_bcast_packet_to_list(bat_priv, forw_packet, delay);
	return NETDEV_TX_OK;

packet_free:
	kfree(forw_packet);
out_and_inc:
	atomic_inc(&bat_priv->bcast_queue_left);
out:
	if (primary_if)
		batadv_hardif_put(primary_if);
	return NETDEV_TX_BUSY;
}

static void batadv_send_outstanding_bcast_packet(struct work_struct *work)
{
	struct batadv_hard_iface *hard_iface;
	struct delayed_work *delayed_work;
	struct batadv_forw_packet *forw_packet;
	struct sk_buff *skb1;
	struct net_device *soft_iface;
	struct batadv_priv *bat_priv;

	delayed_work = container_of(work, struct delayed_work, work);
	forw_packet = container_of(delayed_work, struct batadv_forw_packet,
				   delayed_work);
	soft_iface = forw_packet->if_incoming->soft_iface;
	bat_priv = netdev_priv(soft_iface);

	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
	hlist_del(&forw_packet->list);
	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
		goto out;

	if (batadv_dat_drop_broadcast_packet(bat_priv, forw_packet))
		goto out;

	/* rebroadcast packet */
	rcu_read_lock();
	list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
		if (hard_iface->soft_iface != soft_iface)
			continue;

		if (forw_packet->num_packets >= hard_iface->num_bcasts)
			continue;

		/* send a copy of the saved skb */
		skb1 = skb_clone(forw_packet->skb, GFP_ATOMIC);
		if (skb1)
			batadv_send_broadcast_skb(skb1, hard_iface);
	}
	rcu_read_unlock();

	forw_packet->num_packets++;

	/* if we still have some more bcasts to send */
	if (forw_packet->num_packets < BATADV_NUM_BCASTS_MAX) {
		_batadv_add_bcast_packet_to_list(bat_priv, forw_packet,
						 msecs_to_jiffies(5));
		return;
	}

out:
	batadv_forw_packet_free(forw_packet);
	atomic_inc(&bat_priv->bcast_queue_left);
}

void batadv_send_outstanding_bat_ogm_packet(struct work_struct *work)
{
	struct delayed_work *delayed_work;
	struct batadv_forw_packet *forw_packet;
	struct batadv_priv *bat_priv;

	delayed_work = container_of(work, struct delayed_work, work);
	forw_packet = container_of(delayed_work, struct batadv_forw_packet,
				   delayed_work);
	bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
	spin_lock_bh(&bat_priv->forw_bat_list_lock);
	hlist_del(&forw_packet->list);
	spin_unlock_bh(&bat_priv->forw_bat_list_lock);

	if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING)
		goto out;

	bat_priv->bat_algo_ops->bat_ogm_emit(forw_packet);

	/* we have to have at least one packet in the queue to determine the
	 * queues wake up time unless we are shutting down.
	 *
	 * only re-schedule if this is the "original" copy, e.g. the OGM of the
	 * primary interface should only be rescheduled once per period, but
	 * this function will be called for the forw_packet instances of the
	 * other secondary interfaces as well.
	 */
	if (forw_packet->own &&
	    forw_packet->if_incoming == forw_packet->if_outgoing)
		batadv_schedule_bat_ogm(forw_packet->if_incoming);

out:
	/* don't count own packet */
	if (!forw_packet->own)
		atomic_inc(&bat_priv->batman_queue_left);

	batadv_forw_packet_free(forw_packet);
}

void
batadv_purge_outstanding_packets(struct batadv_priv *bat_priv,
				 const struct batadv_hard_iface *hard_iface)
{
	struct batadv_forw_packet *forw_packet;
	struct hlist_node *safe_tmp_node;
	bool pending;

	if (hard_iface)
		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
			   "purge_outstanding_packets(): %s\n",
			   hard_iface->net_dev->name);
	else
		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
			   "purge_outstanding_packets()\n");

	/* free bcast list */
	spin_lock_bh(&bat_priv->forw_bcast_list_lock);
	hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
				  &bat_priv->forw_bcast_list, list) {
		/* if purge_outstanding_packets() was called with an argument
		 * we delete only packets belonging to the given interface
		 */
		if ((hard_iface) &&
		    (forw_packet->if_incoming != hard_iface) &&
		    (forw_packet->if_outgoing != hard_iface))
			continue;

		spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

		/* batadv_send_outstanding_bcast_packet() will lock the list to
		 * delete the item from the list
		 */
		pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
		spin_lock_bh(&bat_priv->forw_bcast_list_lock);

		if (pending) {
			hlist_del(&forw_packet->list);
			batadv_forw_packet_free(forw_packet);
		}
	}
	spin_unlock_bh(&bat_priv->forw_bcast_list_lock);

	/* free batman packet list */
	spin_lock_bh(&bat_priv->forw_bat_list_lock);
	hlist_for_each_entry_safe(forw_packet, safe_tmp_node,
				  &bat_priv->forw_bat_list, list) {
		/* if purge_outstanding_packets() was called with an argument
		 * we delete only packets belonging to the given interface
		 */
		if ((hard_iface) &&
		    (forw_packet->if_incoming != hard_iface) &&
		    (forw_packet->if_outgoing != hard_iface))
			continue;

		spin_unlock_bh(&bat_priv->forw_bat_list_lock);

		/* send_outstanding_bat_packet() will lock the list to
		 * delete the item from the list
		 */
		pending = cancel_delayed_work_sync(&forw_packet->delayed_work);
		spin_lock_bh(&bat_priv->forw_bat_list_lock);

		if (pending) {
			hlist_del(&forw_packet->list);
			batadv_forw_packet_free(forw_packet);
		}
	}
	spin_unlock_bh(&bat_priv->forw_bat_list_lock);
}