summaryrefslogtreecommitdiffstats
path: root/net/batman-adv/bat_iv_ogm.c
blob: cd8f473c1bd0299e50f04a398626a4a43353b6fb (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
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
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
/*
 * Copyright (C) 2007-2012 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 "ring_buffer.h"
#include "originator.h"
#include "routing.h"
#include "gateway_common.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "send.h"
#include "bat_algo.h"

static int bat_iv_ogm_iface_enable(struct hard_iface *hard_iface)
{
	struct batman_ogm_packet *batman_ogm_packet;
	uint32_t random_seqno;
	int res = -1;

	/* randomize initial seqno to avoid collision */
	get_random_bytes(&random_seqno, sizeof(random_seqno));
	atomic_set(&hard_iface->seqno, random_seqno);

	hard_iface->packet_len = BATMAN_OGM_HLEN;
	hard_iface->packet_buff = kmalloc(hard_iface->packet_len, GFP_ATOMIC);

	if (!hard_iface->packet_buff)
		goto out;

	batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
	batman_ogm_packet->header.packet_type = BAT_IV_OGM;
	batman_ogm_packet->header.version = COMPAT_VERSION;
	batman_ogm_packet->header.ttl = 2;
	batman_ogm_packet->flags = NO_FLAGS;
	batman_ogm_packet->tq = TQ_MAX_VALUE;
	batman_ogm_packet->tt_num_changes = 0;
	batman_ogm_packet->ttvn = 0;

	res = 0;

out:
	return res;
}

static void bat_iv_ogm_iface_disable(struct hard_iface *hard_iface)
{
	kfree(hard_iface->packet_buff);
	hard_iface->packet_buff = NULL;
}

static void bat_iv_ogm_primary_iface_set(struct hard_iface *hard_iface)
{
	struct batman_ogm_packet *batman_ogm_packet;

	batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
	batman_ogm_packet->flags = PRIMARIES_FIRST_HOP;
	batman_ogm_packet->header.ttl = TTL;
}

static void bat_iv_ogm_update_mac(struct hard_iface *hard_iface)
{
	struct batman_ogm_packet *batman_ogm_packet;

	batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;
	memcpy(batman_ogm_packet->orig,
	       hard_iface->net_dev->dev_addr, ETH_ALEN);
	memcpy(batman_ogm_packet->prev_sender,
	       hard_iface->net_dev->dev_addr, ETH_ALEN);
}

/* when do we schedule our own ogm to be sent */
static unsigned long bat_iv_ogm_emit_send_time(const struct bat_priv *bat_priv)
{
	return jiffies + msecs_to_jiffies(
		   atomic_read(&bat_priv->orig_interval) -
		   JITTER + (random32() % 2*JITTER));
}

/* when do we schedule a ogm packet to be sent */
static unsigned long bat_iv_ogm_fwd_send_time(void)
{
	return jiffies + msecs_to_jiffies(random32() % (JITTER/2));
}

/* apply hop penalty for a normal link */
static uint8_t hop_penalty(uint8_t tq, const struct bat_priv *bat_priv)
{
	int hop_penalty = atomic_read(&bat_priv->hop_penalty);
	return (tq * (TQ_MAX_VALUE - hop_penalty)) / (TQ_MAX_VALUE);
}

/* is there another aggregated packet here? */
static int bat_iv_ogm_aggr_packet(int buff_pos, int packet_len,
				  int tt_num_changes)
{
	int next_buff_pos = buff_pos + BATMAN_OGM_HLEN + tt_len(tt_num_changes);

	return (next_buff_pos <= packet_len) &&
		(next_buff_pos <= MAX_AGGREGATION_BYTES);
}

/* send a batman ogm to a given interface */
static void bat_iv_ogm_send_to_if(struct forw_packet *forw_packet,
				  struct hard_iface *hard_iface)
{
	struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
	char *fwd_str;
	uint8_t packet_num;
	int16_t buff_pos;
	struct batman_ogm_packet *batman_ogm_packet;
	struct sk_buff *skb;

	if (hard_iface->if_status != IF_ACTIVE)
		return;

	packet_num = 0;
	buff_pos = 0;
	batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;

	/* adjust all flags and log packets */
	while (bat_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
				      batman_ogm_packet->tt_num_changes)) {

		/* we might have aggregated direct link packets with an
		 * ordinary base packet */
		if ((forw_packet->direct_link_flags & (1 << packet_num)) &&
		    (forw_packet->if_incoming == hard_iface))
			batman_ogm_packet->flags |= DIRECTLINK;
		else
			batman_ogm_packet->flags &= ~DIRECTLINK;

		fwd_str = (packet_num > 0 ? "Forwarding" : (forw_packet->own ?
							    "Sending own" :
							    "Forwarding"));
		bat_dbg(DBG_BATMAN, bat_priv,
			"%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s, ttvn %d) on interface %s [%pM]\n",
			fwd_str, (packet_num > 0 ? "aggregated " : ""),
			batman_ogm_packet->orig,
			ntohl(batman_ogm_packet->seqno),
			batman_ogm_packet->tq, batman_ogm_packet->header.ttl,
			(batman_ogm_packet->flags & DIRECTLINK ?
			 "on" : "off"),
			batman_ogm_packet->ttvn, hard_iface->net_dev->name,
			hard_iface->net_dev->dev_addr);

		buff_pos += BATMAN_OGM_HLEN +
				tt_len(batman_ogm_packet->tt_num_changes);
		packet_num++;
		batman_ogm_packet = (struct batman_ogm_packet *)
					(forw_packet->skb->data + buff_pos);
	}

	/* create clone because function is called more than once */
	skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
	if (skb)
		send_skb_packet(skb, hard_iface, broadcast_addr);
}

/* send a batman ogm packet */
static void bat_iv_ogm_emit(struct forw_packet *forw_packet)
{
	struct hard_iface *hard_iface;
	struct net_device *soft_iface;
	struct bat_priv *bat_priv;
	struct hard_iface *primary_if = NULL;
	struct batman_ogm_packet *batman_ogm_packet;
	unsigned char directlink;

	batman_ogm_packet = (struct batman_ogm_packet *)
						(forw_packet->skb->data);
	directlink = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);

	if (!forw_packet->if_incoming) {
		pr_err("Error - can't forward packet: incoming iface not specified\n");
		goto out;
	}

	soft_iface = forw_packet->if_incoming->soft_iface;
	bat_priv = netdev_priv(soft_iface);

	if (forw_packet->if_incoming->if_status != IF_ACTIVE)
		goto out;

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

	/* multihomed peer assumed */
	/* non-primary OGMs are only broadcasted on their interface */
	if ((directlink && (batman_ogm_packet->header.ttl == 1)) ||
	    (forw_packet->own && (forw_packet->if_incoming != primary_if))) {

		/* FIXME: what about aggregated packets ? */
		bat_dbg(DBG_BATMAN, bat_priv,
			"%s packet (originator %pM, seqno %u, TTL %d) on interface %s [%pM]\n",
			(forw_packet->own ? "Sending own" : "Forwarding"),
			batman_ogm_packet->orig,
			ntohl(batman_ogm_packet->seqno),
			batman_ogm_packet->header.ttl,
			forw_packet->if_incoming->net_dev->name,
			forw_packet->if_incoming->net_dev->dev_addr);

		/* skb is only used once and than forw_packet is free'd */
		send_skb_packet(forw_packet->skb, forw_packet->if_incoming,
				broadcast_addr);
		forw_packet->skb = NULL;

		goto out;
	}

	/* broadcast on every interface */
	rcu_read_lock();
	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
		if (hard_iface->soft_iface != soft_iface)
			continue;

		bat_iv_ogm_send_to_if(forw_packet, hard_iface);
	}
	rcu_read_unlock();

out:
	if (primary_if)
		hardif_free_ref(primary_if);
}

/* return true if new_packet can be aggregated with forw_packet */
static bool bat_iv_ogm_can_aggregate(const struct batman_ogm_packet
							*new_batman_ogm_packet,
				     struct bat_priv *bat_priv,
				     int packet_len, unsigned long send_time,
				     bool directlink,
				     const struct hard_iface *if_incoming,
				     const struct forw_packet *forw_packet)
{
	struct batman_ogm_packet *batman_ogm_packet;
	int aggregated_bytes = forw_packet->packet_len + packet_len;
	struct hard_iface *primary_if = NULL;
	bool res = false;

	batman_ogm_packet = (struct batman_ogm_packet *)forw_packet->skb->data;

	/**
	 * we can aggregate the current packet to this aggregated packet
	 * if:
	 *
	 * - the send time is within our MAX_AGGREGATION_MS time
	 * - the resulting packet wont be bigger than
	 *   MAX_AGGREGATION_BYTES
	 */

	if (time_before(send_time, forw_packet->send_time) &&
	    time_after_eq(send_time + msecs_to_jiffies(MAX_AGGREGATION_MS),
					forw_packet->send_time) &&
	    (aggregated_bytes <= MAX_AGGREGATION_BYTES)) {

		/**
		 * check aggregation compatibility
		 * -> direct link packets are broadcasted on
		 *    their interface only
		 * -> aggregate packet if the current packet is
		 *    a "global" packet as well as the base
		 *    packet
		 */

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

		/* packets without direct link flag and high TTL
		 * are flooded through the net  */
		if ((!directlink) &&
		    (!(batman_ogm_packet->flags & DIRECTLINK)) &&
		    (batman_ogm_packet->header.ttl != 1) &&

		    /* own packets originating non-primary
		     * interfaces leave only that interface */
		    ((!forw_packet->own) ||
		     (forw_packet->if_incoming == primary_if))) {
			res = true;
			goto out;
		}

		/* if the incoming packet is sent via this one
		 * interface only - we still can aggregate */
		if ((directlink) &&
		    (new_batman_ogm_packet->header.ttl == 1) &&
		    (forw_packet->if_incoming == if_incoming) &&

		    /* packets from direct neighbors or
		     * own secondary interface packets
		     * (= secondary interface packets in general) */
		    (batman_ogm_packet->flags & DIRECTLINK ||
		     (forw_packet->own &&
		      forw_packet->if_incoming != primary_if))) {
			res = true;
			goto out;
		}
	}

out:
	if (primary_if)
		hardif_free_ref(primary_if);
	return res;
}

/* create a new aggregated packet and add this packet to it */
static void bat_iv_ogm_aggregate_new(const unsigned char *packet_buff,
				     int packet_len, unsigned long send_time,
				     bool direct_link,
				     struct hard_iface *if_incoming,
				     int own_packet)
{
	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
	struct forw_packet *forw_packet_aggr;
	unsigned char *skb_buff;

	if (!atomic_inc_not_zero(&if_incoming->refcount))
		return;

	/* own packet should always be scheduled */
	if (!own_packet) {
		if (!atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
			bat_dbg(DBG_BATMAN, bat_priv,
				"batman packet queue full\n");
			goto out;
		}
	}

	forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
	if (!forw_packet_aggr) {
		if (!own_packet)
			atomic_inc(&bat_priv->batman_queue_left);
		goto out;
	}

	if ((atomic_read(&bat_priv->aggregated_ogms)) &&
	    (packet_len < MAX_AGGREGATION_BYTES))
		forw_packet_aggr->skb = dev_alloc_skb(MAX_AGGREGATION_BYTES +
						      ETH_HLEN);
	else
		forw_packet_aggr->skb = dev_alloc_skb(packet_len + ETH_HLEN);

	if (!forw_packet_aggr->skb) {
		if (!own_packet)
			atomic_inc(&bat_priv->batman_queue_left);
		kfree(forw_packet_aggr);
		goto out;
	}
	skb_reserve(forw_packet_aggr->skb, ETH_HLEN);

	INIT_HLIST_NODE(&forw_packet_aggr->list);

	skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
	forw_packet_aggr->packet_len = packet_len;
	memcpy(skb_buff, packet_buff, packet_len);

	forw_packet_aggr->own = own_packet;
	forw_packet_aggr->if_incoming = if_incoming;
	forw_packet_aggr->num_packets = 0;
	forw_packet_aggr->direct_link_flags = NO_FLAGS;
	forw_packet_aggr->send_time = send_time;

	/* save packet direct link flag status */
	if (direct_link)
		forw_packet_aggr->direct_link_flags |= 1;

	/* add new packet to packet list */
	spin_lock_bh(&bat_priv->forw_bat_list_lock);
	hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
	spin_unlock_bh(&bat_priv->forw_bat_list_lock);

	/* start timer for this packet */
	INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
			  send_outstanding_bat_ogm_packet);
	queue_delayed_work(bat_event_workqueue,
			   &forw_packet_aggr->delayed_work,
			   send_time - jiffies);

	return;
out:
	hardif_free_ref(if_incoming);
}

/* aggregate a new packet into the existing ogm packet */
static void bat_iv_ogm_aggregate(struct forw_packet *forw_packet_aggr,
				 const unsigned char *packet_buff,
				 int packet_len, bool direct_link)
{
	unsigned char *skb_buff;

	skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
	memcpy(skb_buff, packet_buff, packet_len);
	forw_packet_aggr->packet_len += packet_len;
	forw_packet_aggr->num_packets++;

	/* save packet direct link flag status */
	if (direct_link)
		forw_packet_aggr->direct_link_flags |=
			(1 << forw_packet_aggr->num_packets);
}

static void bat_iv_ogm_queue_add(struct bat_priv *bat_priv,
				 unsigned char *packet_buff,
				 int packet_len, struct hard_iface *if_incoming,
				 int own_packet, unsigned long send_time)
{
	/**
	 * _aggr -> pointer to the packet we want to aggregate with
	 * _pos -> pointer to the position in the queue
	 */
	struct forw_packet *forw_packet_aggr = NULL, *forw_packet_pos = NULL;
	struct hlist_node *tmp_node;
	struct batman_ogm_packet *batman_ogm_packet;
	bool direct_link;

	batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;
	direct_link = batman_ogm_packet->flags & DIRECTLINK ? 1 : 0;

	/* find position for the packet in the forward queue */
	spin_lock_bh(&bat_priv->forw_bat_list_lock);
	/* own packets are not to be aggregated */
	if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
		hlist_for_each_entry(forw_packet_pos, tmp_node,
				     &bat_priv->forw_bat_list, list) {
			if (bat_iv_ogm_can_aggregate(batman_ogm_packet,
						     bat_priv, packet_len,
						     send_time, direct_link,
						     if_incoming,
						     forw_packet_pos)) {
				forw_packet_aggr = forw_packet_pos;
				break;
			}
		}
	}

	/* nothing to aggregate with - either aggregation disabled or no
	 * suitable aggregation packet found */
	if (!forw_packet_aggr) {
		/* the following section can run without the lock */
		spin_unlock_bh(&bat_priv->forw_bat_list_lock);

		/**
		 * if we could not aggregate this packet with one of the others
		 * we hold it back for a while, so that it might be aggregated
		 * later on
		 */
		if ((!own_packet) &&
		    (atomic_read(&bat_priv->aggregated_ogms)))
			send_time += msecs_to_jiffies(MAX_AGGREGATION_MS);

		bat_iv_ogm_aggregate_new(packet_buff, packet_len,
					 send_time, direct_link,
					 if_incoming, own_packet);
	} else {
		bat_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
				     packet_len, direct_link);
		spin_unlock_bh(&bat_priv->forw_bat_list_lock);
	}
}

static void bat_iv_ogm_forward(struct orig_node *orig_node,
			       const struct ethhdr *ethhdr,
			       struct batman_ogm_packet *batman_ogm_packet,
			       bool is_single_hop_neigh,
			       struct hard_iface *if_incoming)
{
	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
	struct neigh_node *router;
	uint8_t in_tq, in_ttl, tq_avg = 0;
	uint8_t tt_num_changes;

	if (batman_ogm_packet->header.ttl <= 1) {
		bat_dbg(DBG_BATMAN, bat_priv, "ttl exceeded\n");
		return;
	}

	router = orig_node_get_router(orig_node);

	in_tq = batman_ogm_packet->tq;
	in_ttl = batman_ogm_packet->header.ttl;
	tt_num_changes = batman_ogm_packet->tt_num_changes;

	batman_ogm_packet->header.ttl--;
	memcpy(batman_ogm_packet->prev_sender, ethhdr->h_source, ETH_ALEN);

	/* rebroadcast tq of our best ranking neighbor to ensure the rebroadcast
	 * of our best tq value */
	if (router && router->tq_avg != 0) {

		/* rebroadcast ogm of best ranking neighbor as is */
		if (!compare_eth(router->addr, ethhdr->h_source)) {
			batman_ogm_packet->tq = router->tq_avg;

			if (router->last_ttl)
				batman_ogm_packet->header.ttl =
					router->last_ttl - 1;
		}

		tq_avg = router->tq_avg;
	}

	if (router)
		neigh_node_free_ref(router);

	/* apply hop penalty */
	batman_ogm_packet->tq = hop_penalty(batman_ogm_packet->tq, bat_priv);

	bat_dbg(DBG_BATMAN, bat_priv,
		"Forwarding packet: tq_orig: %i, tq_avg: %i, tq_forw: %i, ttl_orig: %i, ttl_forw: %i\n",
		in_tq, tq_avg, batman_ogm_packet->tq, in_ttl - 1,
		batman_ogm_packet->header.ttl);

	batman_ogm_packet->seqno = htonl(batman_ogm_packet->seqno);
	batman_ogm_packet->tt_crc = htons(batman_ogm_packet->tt_crc);

	/* switch of primaries first hop flag when forwarding */
	batman_ogm_packet->flags &= ~PRIMARIES_FIRST_HOP;
	if (is_single_hop_neigh)
		batman_ogm_packet->flags |= DIRECTLINK;
	else
		batman_ogm_packet->flags &= ~DIRECTLINK;

	bat_iv_ogm_queue_add(bat_priv, (unsigned char *)batman_ogm_packet,
			     BATMAN_OGM_HLEN + tt_len(tt_num_changes),
			     if_incoming, 0, bat_iv_ogm_fwd_send_time());
}

static void bat_iv_ogm_schedule(struct hard_iface *hard_iface,
				int tt_num_changes)
{
	struct bat_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
	struct batman_ogm_packet *batman_ogm_packet;
	struct hard_iface *primary_if;
	int vis_server;

	vis_server = atomic_read(&bat_priv->vis_mode);
	primary_if = primary_if_get_selected(bat_priv);

	batman_ogm_packet = (struct batman_ogm_packet *)hard_iface->packet_buff;

	/* change sequence number to network order */
	batman_ogm_packet->seqno =
			htonl((uint32_t)atomic_read(&hard_iface->seqno));

	batman_ogm_packet->ttvn = atomic_read(&bat_priv->ttvn);
	batman_ogm_packet->tt_crc = htons((uint16_t)
						atomic_read(&bat_priv->tt_crc));
	if (tt_num_changes >= 0)
		batman_ogm_packet->tt_num_changes = tt_num_changes;

	if (vis_server == VIS_TYPE_SERVER_SYNC)
		batman_ogm_packet->flags |= VIS_SERVER;
	else
		batman_ogm_packet->flags &= ~VIS_SERVER;

	if ((hard_iface == primary_if) &&
	    (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER))
		batman_ogm_packet->gw_flags =
				(uint8_t)atomic_read(&bat_priv->gw_bandwidth);
	else
		batman_ogm_packet->gw_flags = NO_FLAGS;

	atomic_inc(&hard_iface->seqno);

	slide_own_bcast_window(hard_iface);
	bat_iv_ogm_queue_add(bat_priv, hard_iface->packet_buff,
			     hard_iface->packet_len, hard_iface, 1,
			     bat_iv_ogm_emit_send_time(bat_priv));

	if (primary_if)
		hardif_free_ref(primary_if);
}

static void bat_iv_ogm_orig_update(struct bat_priv *bat_priv,
				   struct orig_node *orig_node,
				   const struct ethhdr *ethhdr,
				   const struct batman_ogm_packet
							*batman_ogm_packet,
				   struct hard_iface *if_incoming,
				   const unsigned char *tt_buff,
				   int is_duplicate)
{
	struct neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
	struct neigh_node *router = NULL;
	struct orig_node *orig_node_tmp;
	struct hlist_node *node;
	uint8_t bcast_own_sum_orig, bcast_own_sum_neigh;

	bat_dbg(DBG_BATMAN, bat_priv,
		"update_originator(): Searching and updating originator entry of received packet\n");

	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_node->neigh_list, list) {
		if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
		    (tmp_neigh_node->if_incoming == if_incoming) &&
		     atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
			if (neigh_node)
				neigh_node_free_ref(neigh_node);
			neigh_node = tmp_neigh_node;
			continue;
		}

		if (is_duplicate)
			continue;

		spin_lock_bh(&tmp_neigh_node->tq_lock);
		ring_buffer_set(tmp_neigh_node->tq_recv,
				&tmp_neigh_node->tq_index, 0);
		tmp_neigh_node->tq_avg =
			ring_buffer_avg(tmp_neigh_node->tq_recv);
		spin_unlock_bh(&tmp_neigh_node->tq_lock);
	}

	if (!neigh_node) {
		struct orig_node *orig_tmp;

		orig_tmp = get_orig_node(bat_priv, ethhdr->h_source);
		if (!orig_tmp)
			goto unlock;

		neigh_node = create_neighbor(orig_node, orig_tmp,
					     ethhdr->h_source, if_incoming);

		orig_node_free_ref(orig_tmp);
		if (!neigh_node)
			goto unlock;
	} else
		bat_dbg(DBG_BATMAN, bat_priv,
			"Updating existing last-hop neighbor of originator\n");

	rcu_read_unlock();

	orig_node->flags = batman_ogm_packet->flags;
	neigh_node->last_valid = jiffies;

	spin_lock_bh(&neigh_node->tq_lock);
	ring_buffer_set(neigh_node->tq_recv,
			&neigh_node->tq_index,
			batman_ogm_packet->tq);
	neigh_node->tq_avg = ring_buffer_avg(neigh_node->tq_recv);
	spin_unlock_bh(&neigh_node->tq_lock);

	if (!is_duplicate) {
		orig_node->last_ttl = batman_ogm_packet->header.ttl;
		neigh_node->last_ttl = batman_ogm_packet->header.ttl;
	}

	bonding_candidate_add(orig_node, neigh_node);

	/* if this neighbor already is our next hop there is nothing
	 * to change */
	router = orig_node_get_router(orig_node);
	if (router == neigh_node)
		goto update_tt;

	/* if this neighbor does not offer a better TQ we won't consider it */
	if (router && (router->tq_avg > neigh_node->tq_avg))
		goto update_tt;

	/* if the TQ is the same and the link not more symmetric we
	 * won't consider it either */
	if (router && (neigh_node->tq_avg == router->tq_avg)) {
		orig_node_tmp = router->orig_node;
		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
		bcast_own_sum_orig =
			orig_node_tmp->bcast_own_sum[if_incoming->if_num];
		spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);

		orig_node_tmp = neigh_node->orig_node;
		spin_lock_bh(&orig_node_tmp->ogm_cnt_lock);
		bcast_own_sum_neigh =
			orig_node_tmp->bcast_own_sum[if_incoming->if_num];
		spin_unlock_bh(&orig_node_tmp->ogm_cnt_lock);

		if (bcast_own_sum_orig >= bcast_own_sum_neigh)
			goto update_tt;
	}

	update_route(bat_priv, orig_node, neigh_node);

update_tt:
	/* I have to check for transtable changes only if the OGM has been
	 * sent through a primary interface */
	if (((batman_ogm_packet->orig != ethhdr->h_source) &&
	     (batman_ogm_packet->header.ttl > 2)) ||
	    (batman_ogm_packet->flags & PRIMARIES_FIRST_HOP))
		tt_update_orig(bat_priv, orig_node, tt_buff,
			       batman_ogm_packet->tt_num_changes,
			       batman_ogm_packet->ttvn,
			       batman_ogm_packet->tt_crc);

	if (orig_node->gw_flags != batman_ogm_packet->gw_flags)
		gw_node_update(bat_priv, orig_node,
			       batman_ogm_packet->gw_flags);

	orig_node->gw_flags = batman_ogm_packet->gw_flags;

	/* restart gateway selection if fast or late switching was enabled */
	if ((orig_node->gw_flags) &&
	    (atomic_read(&bat_priv->gw_mode) == GW_MODE_CLIENT) &&
	    (atomic_read(&bat_priv->gw_sel_class) > 2))
		gw_check_election(bat_priv, orig_node);

	goto out;

unlock:
	rcu_read_unlock();
out:
	if (neigh_node)
		neigh_node_free_ref(neigh_node);
	if (router)
		neigh_node_free_ref(router);
}

static int bat_iv_ogm_calc_tq(struct orig_node *orig_node,
			      struct orig_node *orig_neigh_node,
			      struct batman_ogm_packet *batman_ogm_packet,
			      struct hard_iface *if_incoming)
{
	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
	struct neigh_node *neigh_node = NULL, *tmp_neigh_node;
	struct hlist_node *node;
	uint8_t total_count;
	uint8_t orig_eq_count, neigh_rq_count, tq_own;
	int tq_asym_penalty, ret = 0;

	/* find corresponding one hop neighbor */
	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_neigh_node->neigh_list, list) {

		if (!compare_eth(tmp_neigh_node->addr, orig_neigh_node->orig))
			continue;

		if (tmp_neigh_node->if_incoming != if_incoming)
			continue;

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

		neigh_node = tmp_neigh_node;
		break;
	}
	rcu_read_unlock();

	if (!neigh_node)
		neigh_node = create_neighbor(orig_neigh_node,
					     orig_neigh_node,
					     orig_neigh_node->orig,
					     if_incoming);

	if (!neigh_node)
		goto out;

	/* if orig_node is direct neighbor update neigh_node last_valid */
	if (orig_node == orig_neigh_node)
		neigh_node->last_valid = jiffies;

	orig_node->last_valid = jiffies;

	/* find packet count of corresponding one hop neighbor */
	spin_lock_bh(&orig_node->ogm_cnt_lock);
	orig_eq_count = orig_neigh_node->bcast_own_sum[if_incoming->if_num];
	neigh_rq_count = neigh_node->real_packet_count;
	spin_unlock_bh(&orig_node->ogm_cnt_lock);

	/* pay attention to not get a value bigger than 100 % */
	total_count = (orig_eq_count > neigh_rq_count ?
		       neigh_rq_count : orig_eq_count);

	/* if we have too few packets (too less data) we set tq_own to zero */
	/* if we receive too few packets it is not considered bidirectional */
	if ((total_count < TQ_LOCAL_BIDRECT_SEND_MINIMUM) ||
	    (neigh_rq_count < TQ_LOCAL_BIDRECT_RECV_MINIMUM))
		tq_own = 0;
	else
		/* neigh_node->real_packet_count is never zero as we
		 * only purge old information when getting new
		 * information */
		tq_own = (TQ_MAX_VALUE * total_count) /	neigh_rq_count;

	/* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
	 * affect the nearly-symmetric links only a little, but
	 * punishes asymmetric links more.  This will give a value
	 * between 0 and TQ_MAX_VALUE
	 */
	tq_asym_penalty = TQ_MAX_VALUE - (TQ_MAX_VALUE *
				(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
				(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count) *
				(TQ_LOCAL_WINDOW_SIZE - neigh_rq_count)) /
					(TQ_LOCAL_WINDOW_SIZE *
					 TQ_LOCAL_WINDOW_SIZE *
					 TQ_LOCAL_WINDOW_SIZE);

	batman_ogm_packet->tq = ((batman_ogm_packet->tq * tq_own
							* tq_asym_penalty) /
						(TQ_MAX_VALUE * TQ_MAX_VALUE));

	bat_dbg(DBG_BATMAN, bat_priv,
		"bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, total tq: %3i\n",
		orig_node->orig, orig_neigh_node->orig, total_count,
		neigh_rq_count, tq_own,	tq_asym_penalty, batman_ogm_packet->tq);

	/* if link has the minimum required transmission quality
	 * consider it bidirectional */
	if (batman_ogm_packet->tq >= TQ_TOTAL_BIDRECT_LIMIT)
		ret = 1;

out:
	if (neigh_node)
		neigh_node_free_ref(neigh_node);
	return ret;
}

/* processes a batman packet for all interfaces, adjusts the sequence number and
 * finds out whether it is a duplicate.
 * returns:
 *   1 the packet is a duplicate
 *   0 the packet has not yet been received
 *  -1 the packet is old and has been received while the seqno window
 *     was protected. Caller should drop it.
 */
static int bat_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
				    const struct batman_ogm_packet
							*batman_ogm_packet,
				    const struct hard_iface *if_incoming)
{
	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
	struct orig_node *orig_node;
	struct neigh_node *tmp_neigh_node;
	struct hlist_node *node;
	int is_duplicate = 0;
	int32_t seq_diff;
	int need_update = 0;
	int set_mark, ret = -1;

	orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
	if (!orig_node)
		return 0;

	spin_lock_bh(&orig_node->ogm_cnt_lock);
	seq_diff = batman_ogm_packet->seqno - orig_node->last_real_seqno;

	/* signalize caller that the packet is to be dropped. */
	if (!hlist_empty(&orig_node->neigh_list) &&
	    window_protected(bat_priv, seq_diff,
			     &orig_node->batman_seqno_reset))
		goto out;

	rcu_read_lock();
	hlist_for_each_entry_rcu(tmp_neigh_node, node,
				 &orig_node->neigh_list, list) {

		is_duplicate |= bat_test_bit(tmp_neigh_node->real_bits,
					     orig_node->last_real_seqno,
					     batman_ogm_packet->seqno);

		if (compare_eth(tmp_neigh_node->addr, ethhdr->h_source) &&
		    (tmp_neigh_node->if_incoming == if_incoming))
			set_mark = 1;
		else
			set_mark = 0;

		/* if the window moved, set the update flag. */
		need_update |= bit_get_packet(bat_priv,
					      tmp_neigh_node->real_bits,
					      seq_diff, set_mark);

		tmp_neigh_node->real_packet_count =
			bitmap_weight(tmp_neigh_node->real_bits,
				      TQ_LOCAL_WINDOW_SIZE);
	}
	rcu_read_unlock();

	if (need_update) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"updating last_seqno: old %u, new %u\n",
			orig_node->last_real_seqno, batman_ogm_packet->seqno);
		orig_node->last_real_seqno = batman_ogm_packet->seqno;
	}

	ret = is_duplicate;

out:
	spin_unlock_bh(&orig_node->ogm_cnt_lock);
	orig_node_free_ref(orig_node);
	return ret;
}

static void bat_iv_ogm_process(const struct ethhdr *ethhdr,
			       struct batman_ogm_packet *batman_ogm_packet,
			       const unsigned char *tt_buff,
			       struct hard_iface *if_incoming)
{
	struct bat_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
	struct hard_iface *hard_iface;
	struct orig_node *orig_neigh_node, *orig_node;
	struct neigh_node *router = NULL, *router_router = NULL;
	struct neigh_node *orig_neigh_router = NULL;
	int has_directlink_flag;
	int is_my_addr = 0, is_my_orig = 0, is_my_oldorig = 0;
	int is_broadcast = 0, is_bidirectional;
	bool is_single_hop_neigh = false;
	int is_duplicate;
	uint32_t if_incoming_seqno;

	/* Silently drop when the batman packet is actually not a
	 * correct packet.
	 *
	 * This might happen if a packet is padded (e.g. Ethernet has a
	 * minimum frame length of 64 byte) and the aggregation interprets
	 * it as an additional length.
	 *
	 * TODO: A more sane solution would be to have a bit in the
	 * batman_ogm_packet to detect whether the packet is the last
	 * packet in an aggregation.  Here we expect that the padding
	 * is always zero (or not 0x01)
	 */
	if (batman_ogm_packet->header.packet_type != BAT_IV_OGM)
		return;

	/* could be changed by schedule_own_packet() */
	if_incoming_seqno = atomic_read(&if_incoming->seqno);

	has_directlink_flag = (batman_ogm_packet->flags & DIRECTLINK ? 1 : 0);

	if (compare_eth(ethhdr->h_source, batman_ogm_packet->orig))
		is_single_hop_neigh = true;

	bat_dbg(DBG_BATMAN, bat_priv,
		"Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, ttvn %u, crc %u, changes %u, td %d, TTL %d, V %d, IDF %d)\n",
		ethhdr->h_source, if_incoming->net_dev->name,
		if_incoming->net_dev->dev_addr, batman_ogm_packet->orig,
		batman_ogm_packet->prev_sender, batman_ogm_packet->seqno,
		batman_ogm_packet->ttvn, batman_ogm_packet->tt_crc,
		batman_ogm_packet->tt_num_changes, batman_ogm_packet->tq,
		batman_ogm_packet->header.ttl,
		batman_ogm_packet->header.version, has_directlink_flag);

	rcu_read_lock();
	list_for_each_entry_rcu(hard_iface, &hardif_list, list) {
		if (hard_iface->if_status != IF_ACTIVE)
			continue;

		if (hard_iface->soft_iface != if_incoming->soft_iface)
			continue;

		if (compare_eth(ethhdr->h_source,
				hard_iface->net_dev->dev_addr))
			is_my_addr = 1;

		if (compare_eth(batman_ogm_packet->orig,
				hard_iface->net_dev->dev_addr))
			is_my_orig = 1;

		if (compare_eth(batman_ogm_packet->prev_sender,
				hard_iface->net_dev->dev_addr))
			is_my_oldorig = 1;

		if (is_broadcast_ether_addr(ethhdr->h_source))
			is_broadcast = 1;
	}
	rcu_read_unlock();

	if (batman_ogm_packet->header.version != COMPAT_VERSION) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: incompatible batman version (%i)\n",
			batman_ogm_packet->header.version);
		return;
	}

	if (is_my_addr) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: received my own broadcast (sender: %pM)\n",
			ethhdr->h_source);
		return;
	}

	if (is_broadcast) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: ignoring all packets with broadcast source addr (sender: %pM)\n",
			ethhdr->h_source);
		return;
	}

	if (is_my_orig) {
		unsigned long *word;
		int offset;

		orig_neigh_node = get_orig_node(bat_priv, ethhdr->h_source);
		if (!orig_neigh_node)
			return;

		/* neighbor has to indicate direct link and it has to
		 * come via the corresponding interface */
		/* save packet seqno for bidirectional check */
		if (has_directlink_flag &&
		    compare_eth(if_incoming->net_dev->dev_addr,
				batman_ogm_packet->orig)) {
			offset = if_incoming->if_num * NUM_WORDS;

			spin_lock_bh(&orig_neigh_node->ogm_cnt_lock);
			word = &(orig_neigh_node->bcast_own[offset]);
			bat_set_bit(word,
				    if_incoming_seqno -
						batman_ogm_packet->seqno - 2);
			orig_neigh_node->bcast_own_sum[if_incoming->if_num] =
				bitmap_weight(word, TQ_LOCAL_WINDOW_SIZE);
			spin_unlock_bh(&orig_neigh_node->ogm_cnt_lock);
		}

		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: originator packet from myself (via neighbor)\n");
		orig_node_free_ref(orig_neigh_node);
		return;
	}

	if (is_my_oldorig) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
			ethhdr->h_source);
		return;
	}

	orig_node = get_orig_node(bat_priv, batman_ogm_packet->orig);
	if (!orig_node)
		return;

	is_duplicate = bat_iv_ogm_update_seqnos(ethhdr, batman_ogm_packet,
						if_incoming);

	if (is_duplicate == -1) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: packet within seqno protection time (sender: %pM)\n",
			ethhdr->h_source);
		goto out;
	}

	if (batman_ogm_packet->tq == 0) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: originator packet with tq equal 0\n");
		goto out;
	}

	router = orig_node_get_router(orig_node);
	if (router)
		router_router = orig_node_get_router(router->orig_node);

	/* avoid temporary routing loops */
	if (router && router_router &&
	    (compare_eth(router->addr, batman_ogm_packet->prev_sender)) &&
	    !(compare_eth(batman_ogm_packet->orig,
			  batman_ogm_packet->prev_sender)) &&
	    (compare_eth(router->addr, router_router->addr))) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
			ethhdr->h_source);
		goto out;
	}

	/* if sender is a direct neighbor the sender mac equals
	 * originator mac */
	orig_neigh_node = (is_single_hop_neigh ?
			   orig_node :
			   get_orig_node(bat_priv, ethhdr->h_source));
	if (!orig_neigh_node)
		goto out;

	orig_neigh_router = orig_node_get_router(orig_neigh_node);

	/* drop packet if sender is not a direct neighbor and if we
	 * don't route towards it */
	if (!is_single_hop_neigh && (!orig_neigh_router)) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: OGM via unknown neighbor!\n");
		goto out_neigh;
	}

	is_bidirectional = bat_iv_ogm_calc_tq(orig_node, orig_neigh_node,
					      batman_ogm_packet, if_incoming);

	bonding_save_primary(orig_node, orig_neigh_node, batman_ogm_packet);

	/* update ranking if it is not a duplicate or has the same
	 * seqno and similar ttl as the non-duplicate */
	if (is_bidirectional &&
	    (!is_duplicate ||
	     ((orig_node->last_real_seqno == batman_ogm_packet->seqno) &&
	      (orig_node->last_ttl - 3 <= batman_ogm_packet->header.ttl))))
		bat_iv_ogm_orig_update(bat_priv, orig_node, ethhdr,
				       batman_ogm_packet, if_incoming,
				       tt_buff, is_duplicate);

	/* is single hop (direct) neighbor */
	if (is_single_hop_neigh) {

		/* mark direct link on incoming interface */
		bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
				   is_single_hop_neigh, if_incoming);

		bat_dbg(DBG_BATMAN, bat_priv,
			"Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
		goto out_neigh;
	}

	/* multihop originator */
	if (!is_bidirectional) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: not received via bidirectional link\n");
		goto out_neigh;
	}

	if (is_duplicate) {
		bat_dbg(DBG_BATMAN, bat_priv,
			"Drop packet: duplicate packet received\n");
		goto out_neigh;
	}

	bat_dbg(DBG_BATMAN, bat_priv,
		"Forwarding packet: rebroadcast originator packet\n");
	bat_iv_ogm_forward(orig_node, ethhdr, batman_ogm_packet,
			   is_single_hop_neigh, if_incoming);

out_neigh:
	if ((orig_neigh_node) && (!is_single_hop_neigh))
		orig_node_free_ref(orig_neigh_node);
out:
	if (router)
		neigh_node_free_ref(router);
	if (router_router)
		neigh_node_free_ref(router_router);
	if (orig_neigh_router)
		neigh_node_free_ref(orig_neigh_router);

	orig_node_free_ref(orig_node);
}

static void bat_iv_ogm_receive(struct hard_iface *if_incoming,
			       struct sk_buff *skb)
{
	struct batman_ogm_packet *batman_ogm_packet;
	struct ethhdr *ethhdr;
	int buff_pos = 0, packet_len;
	unsigned char *tt_buff, *packet_buff;

	packet_len = skb_headlen(skb);
	ethhdr = (struct ethhdr *)skb_mac_header(skb);
	packet_buff = skb->data;
	batman_ogm_packet = (struct batman_ogm_packet *)packet_buff;

	/* unpack the aggregated packets and process them one by one */
	do {
		/* network to host order for our 32bit seqno and the
		   orig_interval */
		batman_ogm_packet->seqno = ntohl(batman_ogm_packet->seqno);
		batman_ogm_packet->tt_crc = ntohs(batman_ogm_packet->tt_crc);

		tt_buff = packet_buff + buff_pos + BATMAN_OGM_HLEN;

		bat_iv_ogm_process(ethhdr, batman_ogm_packet,
				   tt_buff, if_incoming);

		buff_pos += BATMAN_OGM_HLEN +
				tt_len(batman_ogm_packet->tt_num_changes);

		batman_ogm_packet = (struct batman_ogm_packet *)
						(packet_buff + buff_pos);
	} while (bat_iv_ogm_aggr_packet(buff_pos, packet_len,
					batman_ogm_packet->tt_num_changes));
}

static struct bat_algo_ops batman_iv __read_mostly = {
	.name = "BATMAN IV",
	.bat_iface_enable = bat_iv_ogm_iface_enable,
	.bat_iface_disable = bat_iv_ogm_iface_disable,
	.bat_primary_iface_set = bat_iv_ogm_primary_iface_set,
	.bat_ogm_update_mac = bat_iv_ogm_update_mac,
	.bat_ogm_schedule = bat_iv_ogm_schedule,
	.bat_ogm_emit = bat_iv_ogm_emit,
	.bat_ogm_receive = bat_iv_ogm_receive,
};

int __init bat_iv_init(void)
{
	return bat_algo_register(&batman_iv);
}
OpenPOWER on IntegriCloud