summaryrefslogtreecommitdiffstats
path: root/drivers/media/dvb-core/dvb_net.c
blob: 44225b186f6df4a42945a8f9998361558d470451 (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
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
/*
 * dvb_net.c
 *
 * Copyright (C) 2001 Convergence integrated media GmbH
 *                    Ralph Metzler <ralph@convergence.de>
 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
 *
 * ULE Decapsulation code:
 * Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
 *                      and Department of Scientific Computing
 *                          Paris Lodron University of Salzburg.
 *                          Hilmar Linder <hlinder@cosy.sbg.ac.at>
 *                      and Wolfram Stering <wstering@cosy.sbg.ac.at>
 *
 * ULE Decaps according to RFC 4326.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 */

/*
 * ULE ChangeLog:
 * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
 *
 * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
 *                       ULE Extension header handling.
 *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
 *                       Fraunhofer Institute for Open Communication Systems
 *                       Competence Center for Advanced Satellite Communications.
 *                     Bugfixes and robustness improvements.
 *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
 *                     ULE_DEBUG compile-time option.
 * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
 *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
 *                       Paris Lodron University of Salzburg.
 */

/*
 * FIXME / TODO (dvb_net.c):
 *
 * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/dvb/net.h>
#include <linux/uio.h>
#include <asm/uaccess.h>
#include <linux/crc32.h>
#include <linux/mutex.h>
#include <linux/sched.h>

#include "dvb_demux.h"
#include "dvb_net.h"

static int dvb_net_debug;
module_param(dvb_net_debug, int, 0444);
MODULE_PARM_DESC(dvb_net_debug, "enable debug messages");

#define dprintk(x...) do { if (dvb_net_debug) printk(x); } while (0)


static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
{
	unsigned int j;
	for (j = 0; j < cnt; j++)
		c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
	return c;
}


#define DVB_NET_MULTICAST_MAX 10

#undef ULE_DEBUG

#ifdef ULE_DEBUG

#define MAC_ADDR_PRINTFMT "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x"
#define MAX_ADDR_PRINTFMT_ARGS(macap) (macap)[0],(macap)[1],(macap)[2],(macap)[3],(macap)[4],(macap)[5]

#define isprint(c)	((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'))

static void hexdump( const unsigned char *buf, unsigned short len )
{
	char str[80], octet[10];
	int ofs, i, l;

	for (ofs = 0; ofs < len; ofs += 16) {
		sprintf( str, "%03d: ", ofs );

		for (i = 0; i < 16; i++) {
			if ((i + ofs) < len)
				sprintf( octet, "%02x ", buf[ofs + i] );
			else
				strcpy( octet, "   " );

			strcat( str, octet );
		}
		strcat( str, "  " );
		l = strlen( str );

		for (i = 0; (i < 16) && ((i + ofs) < len); i++)
			str[l++] = isprint( buf[ofs + i] ) ? buf[ofs + i] : '.';

		str[l] = '\0';
		printk( KERN_WARNING "%s\n", str );
	}
}

#endif

struct dvb_net_priv {
	int in_use;
	u16 pid;
	struct net_device *net;
	struct dvb_net *host;
	struct dmx_demux *demux;
	struct dmx_section_feed *secfeed;
	struct dmx_section_filter *secfilter;
	struct dmx_ts_feed *tsfeed;
	int multi_num;
	struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
	unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
	int rx_mode;
#define RX_MODE_UNI 0
#define RX_MODE_MULTI 1
#define RX_MODE_ALL_MULTI 2
#define RX_MODE_PROMISC 3
	struct work_struct set_multicast_list_wq;
	struct work_struct restart_net_feed_wq;
	unsigned char feedtype;			/* Either FEED_TYPE_ or FEED_TYPE_ULE */
	int need_pusi;				/* Set to 1, if synchronization on PUSI required. */
	unsigned char tscc;			/* TS continuity counter after sync on PUSI. */
	struct sk_buff *ule_skb;		/* ULE SNDU decodes into this buffer. */
	unsigned char *ule_next_hdr;		/* Pointer into skb to next ULE extension header. */
	unsigned short ule_sndu_len;		/* ULE SNDU length in bytes, w/o D-Bit. */
	unsigned short ule_sndu_type;		/* ULE SNDU type field, complete. */
	unsigned char ule_sndu_type_1;		/* ULE SNDU type field, if split across 2 TS cells. */
	unsigned char ule_dbit;			/* Whether the DestMAC address present
						 * or not (bit is set). */
	unsigned char ule_bridged;		/* Whether the ULE_BRIDGED extension header was found. */
	int ule_sndu_remain;			/* Nr. of bytes still required for current ULE SNDU. */
	unsigned long ts_count;			/* Current ts cell counter. */
	struct mutex mutex;
};


/**
 *	Determine the packet's protocol ID. The rule here is that we
 *	assume 802.3 if the type field is short enough to be a length.
 *	This is normal practice and works for any 'now in use' protocol.
 *
 *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 *  by Michael Holzt <kju@debian.org>
 */
static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
				      struct net_device *dev)
{
	struct ethhdr *eth;
	unsigned char *rawp;

	skb_reset_mac_header(skb);
	skb_pull(skb,dev->hard_header_len);
	eth = eth_hdr(skb);

	if (*eth->h_dest & 1) {
		if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
			skb->pkt_type=PACKET_BROADCAST;
		else
			skb->pkt_type=PACKET_MULTICAST;
	}

	if (ntohs(eth->h_proto) >= 1536)
		return eth->h_proto;

	rawp = skb->data;

	/**
	 *	This is a magic hack to spot IPX packets. Older Novell breaks
	 *	the protocol design and runs IPX over 802.3 without an 802.2 LLC
	 *	layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
	 *	won't work for fault tolerant netware but does for the rest.
	 */
	if (*(unsigned short *)rawp == 0xFFFF)
		return htons(ETH_P_802_3);

	/**
	 *	Real 802.2 LLC
	 */
	return htons(ETH_P_802_2);
}

#define TS_SZ	188
#define TS_SYNC	0x47
#define TS_TEI	0x80
#define TS_SC	0xC0
#define TS_PUSI	0x40
#define TS_AF_A	0x20
#define TS_AF_D	0x10

/* ULE Extension Header handlers. */

#define ULE_TEST	0
#define ULE_BRIDGED	1

#define ULE_OPTEXTHDR_PADDING 0

static int ule_test_sndu( struct dvb_net_priv *p )
{
	return -1;
}

static int ule_bridged_sndu( struct dvb_net_priv *p )
{
	struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
	if(ntohs(hdr->h_proto) < 1536) {
		int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
		/* A frame Type < 1536 for a bridged frame, introduces a LLC Length field. */
		if(framelen != ntohs(hdr->h_proto)) {
			return -1;
		}
	}
	/* Note:
	 * From RFC4326:
	 *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
	 *   It must be the final (or only) extension header specified in the header chain of a SNDU."
	 * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
	 */
	p->ule_bridged = 1;
	return 0;
}

static int ule_exthdr_padding(struct dvb_net_priv *p)
{
	return 0;
}

/** Handle ULE extension headers.
 *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 *  Returns: >= 0: nr. of bytes consumed by next extension header
 *	     -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 */
static int handle_one_ule_extension( struct dvb_net_priv *p )
{
	/* Table of mandatory extension header handlers.  The header type is the index. */
	static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
		{ [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };

	/* Table of optional extension header handlers.  The header type is the index. */
	static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
		{ [0] = ule_exthdr_padding, [1] = NULL, };

	int ext_len = 0;
	unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
	unsigned char htype = p->ule_sndu_type & 0x00FF;

	/* Discriminate mandatory and optional extension headers. */
	if (hlen == 0) {
		/* Mandatory extension header */
		if (ule_mandatory_ext_handlers[htype]) {
			ext_len = ule_mandatory_ext_handlers[htype]( p );
			if(ext_len >= 0) {
				p->ule_next_hdr += ext_len;
				if (!p->ule_bridged) {
					p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
					p->ule_next_hdr += 2;
				} else {
					p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
					/* This assures the extension handling loop will terminate. */
				}
			}
			// else: extension handler failed or SNDU should be discarded
		} else
			ext_len = -1;	/* SNDU has to be discarded. */
	} else {
		/* Optional extension header.  Calculate the length. */
		ext_len = hlen << 1;
		/* Process the optional extension header according to its type. */
		if (ule_optional_ext_handlers[htype])
			(void)ule_optional_ext_handlers[htype]( p );
		p->ule_next_hdr += ext_len;
		p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
		/*
		 * note: the length of the next header type is included in the
		 * length of THIS optional extension header
		 */
	}

	return ext_len;
}

static int handle_ule_extensions( struct dvb_net_priv *p )
{
	int total_ext_len = 0, l;

	p->ule_next_hdr = p->ule_skb->data;
	do {
		l = handle_one_ule_extension( p );
		if (l < 0)
			return l;	/* Stop extension header processing and discard SNDU. */
		total_ext_len += l;
#ifdef ULE_DEBUG
		dprintk("handle_ule_extensions: ule_next_hdr=%p, ule_sndu_type=%i, "
			"l=%i, total_ext_len=%i\n", p->ule_next_hdr,
			(int) p->ule_sndu_type, l, total_ext_len);
#endif

	} while (p->ule_sndu_type < 1536);

	return total_ext_len;
}


/** Prepare for a new ULE SNDU: reset the decoder state. */
static inline void reset_ule( struct dvb_net_priv *p )
{
	p->ule_skb = NULL;
	p->ule_next_hdr = NULL;
	p->ule_sndu_len = 0;
	p->ule_sndu_type = 0;
	p->ule_sndu_type_1 = 0;
	p->ule_sndu_remain = 0;
	p->ule_dbit = 0xFF;
	p->ule_bridged = 0;
}

/**
 * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 * TS cells of a single PID.
 */
static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
{
	struct dvb_net_priv *priv = netdev_priv(dev);
	unsigned long skipped = 0L;
	const u8 *ts, *ts_end, *from_where = NULL;
	u8 ts_remain = 0, how_much = 0, new_ts = 1;
	struct ethhdr *ethh = NULL;
	bool error = false;

#ifdef ULE_DEBUG
	/* The code inside ULE_DEBUG keeps a history of the last 100 TS cells processed. */
	static unsigned char ule_hist[100*TS_SZ];
	static unsigned char *ule_where = ule_hist, ule_dump;
#endif

	/* For all TS cells in current buffer.
	 * Appearently, we are called for every single TS cell.
	 */
	for (ts = buf, ts_end = buf + buf_len; ts < ts_end; /* no default incr. */ ) {

		if (new_ts) {
			/* We are about to process a new TS cell. */

#ifdef ULE_DEBUG
			if (ule_where >= &ule_hist[100*TS_SZ]) ule_where = ule_hist;
			memcpy( ule_where, ts, TS_SZ );
			if (ule_dump) {
				hexdump( ule_where, TS_SZ );
				ule_dump = 0;
			}
			ule_where += TS_SZ;
#endif

			/* Check TS error conditions: sync_byte, transport_error_indicator, scrambling_control . */
			if ((ts[0] != TS_SYNC) || (ts[1] & TS_TEI) || ((ts[3] & TS_SC) != 0)) {
				printk(KERN_WARNING "%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
				       priv->ts_count, ts[0], ts[1] & TS_TEI >> 7, ts[3] & 0xC0 >> 6);

				/* Drop partly decoded SNDU, reset state, resync on PUSI. */
				if (priv->ule_skb) {
					dev_kfree_skb( priv->ule_skb );
					/* Prepare for next SNDU. */
					dev->stats.rx_errors++;
					dev->stats.rx_frame_errors++;
				}
				reset_ule(priv);
				priv->need_pusi = 1;

				/* Continue with next TS cell. */
				ts += TS_SZ;
				priv->ts_count++;
				continue;
			}

			ts_remain = 184;
			from_where = ts + 4;
		}
		/* Synchronize on PUSI, if required. */
		if (priv->need_pusi) {
			if (ts[1] & TS_PUSI) {
				/* Find beginning of first ULE SNDU in current TS cell. */
				/* Synchronize continuity counter. */
				priv->tscc = ts[3] & 0x0F;
				/* There is a pointer field here. */
				if (ts[4] > ts_remain) {
					printk(KERN_ERR "%lu: Invalid ULE packet "
					       "(pointer field %d)\n", priv->ts_count, ts[4]);
					ts += TS_SZ;
					priv->ts_count++;
					continue;
				}
				/* Skip to destination of pointer field. */
				from_where = &ts[5] + ts[4];
				ts_remain -= 1 + ts[4];
				skipped = 0;
			} else {
				skipped++;
				ts += TS_SZ;
				priv->ts_count++;
				continue;
			}
		}

		if (new_ts) {
			/* Check continuity counter. */
			if ((ts[3] & 0x0F) == priv->tscc)
				priv->tscc = (priv->tscc + 1) & 0x0F;
			else {
				/* TS discontinuity handling: */
				printk(KERN_WARNING "%lu: TS discontinuity: got %#x, "
				       "expected %#x.\n", priv->ts_count, ts[3] & 0x0F, priv->tscc);
				/* Drop partly decoded SNDU, reset state, resync on PUSI. */
				if (priv->ule_skb) {
					dev_kfree_skb( priv->ule_skb );
					/* Prepare for next SNDU. */
					// reset_ule(priv);  moved to below.
					dev->stats.rx_errors++;
					dev->stats.rx_frame_errors++;
				}
				reset_ule(priv);
				/* skip to next PUSI. */
				priv->need_pusi = 1;
				continue;
			}
			/* If we still have an incomplete payload, but PUSI is
			 * set; some TS cells are missing.
			 * This is only possible here, if we missed exactly 16 TS
			 * cells (continuity counter wrap). */
			if (ts[1] & TS_PUSI) {
				if (! priv->need_pusi) {
					if (!(*from_where < (ts_remain-1)) || *from_where != priv->ule_sndu_remain) {
						/* Pointer field is invalid.  Drop this TS cell and any started ULE SNDU. */
						printk(KERN_WARNING "%lu: Invalid pointer "
						       "field: %u.\n", priv->ts_count, *from_where);

						/* Drop partly decoded SNDU, reset state, resync on PUSI. */
						if (priv->ule_skb) {
							error = true;
							dev_kfree_skb(priv->ule_skb);
						}

						if (error || priv->ule_sndu_remain) {
							dev->stats.rx_errors++;
							dev->stats.rx_frame_errors++;
							error = false;
						}

						reset_ule(priv);
						priv->need_pusi = 1;
						continue;
					}
					/* Skip pointer field (we're processing a
					 * packed payload). */
					from_where += 1;
					ts_remain -= 1;
				} else
					priv->need_pusi = 0;

				if (priv->ule_sndu_remain > 183) {
					/* Current SNDU lacks more data than there could be available in the
					 * current TS cell. */
					dev->stats.rx_errors++;
					dev->stats.rx_length_errors++;
					printk(KERN_WARNING "%lu: Expected %d more SNDU bytes, but "
					       "got PUSI (pf %d, ts_remain %d).  Flushing incomplete payload.\n",
					       priv->ts_count, priv->ule_sndu_remain, ts[4], ts_remain);
					dev_kfree_skb(priv->ule_skb);
					/* Prepare for next SNDU. */
					reset_ule(priv);
					/* Resync: go to where pointer field points to: start of next ULE SNDU. */
					from_where += ts[4];
					ts_remain -= ts[4];
				}
			}
		}

		/* Check if new payload needs to be started. */
		if (priv->ule_skb == NULL) {
			/* Start a new payload with skb.
			 * Find ULE header.  It is only guaranteed that the
			 * length field (2 bytes) is contained in the current
			 * TS.
			 * Check ts_remain has to be >= 2 here. */
			if (ts_remain < 2) {
				printk(KERN_WARNING "Invalid payload packing: only %d "
				       "bytes left in TS.  Resyncing.\n", ts_remain);
				priv->ule_sndu_len = 0;
				priv->need_pusi = 1;
				ts += TS_SZ;
				continue;
			}

			if (! priv->ule_sndu_len) {
				/* Got at least two bytes, thus extrace the SNDU length. */
				priv->ule_sndu_len = from_where[0] << 8 | from_where[1];
				if (priv->ule_sndu_len & 0x8000) {
					/* D-Bit is set: no dest mac present. */
					priv->ule_sndu_len &= 0x7FFF;
					priv->ule_dbit = 1;
				} else
					priv->ule_dbit = 0;

				if (priv->ule_sndu_len < 5) {
					printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
					       "Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
					dev->stats.rx_errors++;
					dev->stats.rx_length_errors++;
					priv->ule_sndu_len = 0;
					priv->need_pusi = 1;
					new_ts = 1;
					ts += TS_SZ;
					priv->ts_count++;
					continue;
				}
				ts_remain -= 2;	/* consume the 2 bytes SNDU length. */
				from_where += 2;
			}

			priv->ule_sndu_remain = priv->ule_sndu_len + 2;
			/*
			 * State of current TS:
			 *   ts_remain (remaining bytes in the current TS cell)
			 *   0	ule_type is not available now, we need the next TS cell
			 *   1	the first byte of the ule_type is present
			 * >=2	full ULE header present, maybe some payload data as well.
			 */
			switch (ts_remain) {
				case 1:
					priv->ule_sndu_remain--;
					priv->ule_sndu_type = from_where[0] << 8;
					priv->ule_sndu_type_1 = 1; /* first byte of ule_type is set. */
					ts_remain -= 1; from_where += 1;
					/* Continue w/ next TS. */
				case 0:
					new_ts = 1;
					ts += TS_SZ;
					priv->ts_count++;
					continue;

				default: /* complete ULE header is present in current TS. */
					/* Extract ULE type field. */
					if (priv->ule_sndu_type_1) {
						priv->ule_sndu_type_1 = 0;
						priv->ule_sndu_type |= from_where[0];
						from_where += 1; /* points to payload start. */
						ts_remain -= 1;
					} else {
						/* Complete type is present in new TS. */
						priv->ule_sndu_type = from_where[0] << 8 | from_where[1];
						from_where += 2; /* points to payload start. */
						ts_remain -= 2;
					}
					break;
			}

			/* Allocate the skb (decoder target buffer) with the correct size, as follows:
			 * prepare for the largest case: bridged SNDU with MAC address (dbit = 0). */
			priv->ule_skb = dev_alloc_skb( priv->ule_sndu_len + ETH_HLEN + ETH_ALEN );
			if (priv->ule_skb == NULL) {
				printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
				       dev->name);
				dev->stats.rx_dropped++;
				return;
			}

			/* This includes the CRC32 _and_ dest mac, if !dbit. */
			priv->ule_sndu_remain = priv->ule_sndu_len;
			priv->ule_skb->dev = dev;
			/* Leave space for Ethernet or bridged SNDU header (eth hdr plus one MAC addr). */
			skb_reserve( priv->ule_skb, ETH_HLEN + ETH_ALEN );
		}

		/* Copy data into our current skb. */
		how_much = min(priv->ule_sndu_remain, (int)ts_remain);
		memcpy(skb_put(priv->ule_skb, how_much), from_where, how_much);
		priv->ule_sndu_remain -= how_much;
		ts_remain -= how_much;
		from_where += how_much;

		/* Check for complete payload. */
		if (priv->ule_sndu_remain <= 0) {
			/* Check CRC32, we've got it in our skb already. */
			__be16 ulen = htons(priv->ule_sndu_len);
			__be16 utype = htons(priv->ule_sndu_type);
			const u8 *tail;
			struct kvec iov[3] = {
				{ &ulen, sizeof ulen },
				{ &utype, sizeof utype },
				{ priv->ule_skb->data, priv->ule_skb->len - 4 }
			};
			u32 ule_crc = ~0L, expected_crc;
			if (priv->ule_dbit) {
				/* Set D-bit for CRC32 verification,
				 * if it was set originally. */
				ulen |= htons(0x8000);
			}

			ule_crc = iov_crc32(ule_crc, iov, 3);
			tail = skb_tail_pointer(priv->ule_skb);
			expected_crc = *(tail - 4) << 24 |
				       *(tail - 3) << 16 |
				       *(tail - 2) << 8 |
				       *(tail - 1);
			if (ule_crc != expected_crc) {
				printk(KERN_WARNING "%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
				       priv->ts_count, ule_crc, expected_crc, priv->ule_sndu_len, priv->ule_sndu_type, ts_remain, ts_remain > 2 ? *(unsigned short *)from_where : 0);

#ifdef ULE_DEBUG
				hexdump( iov[0].iov_base, iov[0].iov_len );
				hexdump( iov[1].iov_base, iov[1].iov_len );
				hexdump( iov[2].iov_base, iov[2].iov_len );

				if (ule_where == ule_hist) {
					hexdump( &ule_hist[98*TS_SZ], TS_SZ );
					hexdump( &ule_hist[99*TS_SZ], TS_SZ );
				} else if (ule_where == &ule_hist[TS_SZ]) {
					hexdump( &ule_hist[99*TS_SZ], TS_SZ );
					hexdump( ule_hist, TS_SZ );
				} else {
					hexdump( ule_where - TS_SZ - TS_SZ, TS_SZ );
					hexdump( ule_where - TS_SZ, TS_SZ );
				}
				ule_dump = 1;
#endif

				dev->stats.rx_errors++;
				dev->stats.rx_crc_errors++;
				dev_kfree_skb(priv->ule_skb);
			} else {
				/* CRC32 verified OK. */
				u8 dest_addr[ETH_ALEN];
				static const u8 bc_addr[ETH_ALEN] =
					{ [ 0 ... ETH_ALEN-1] = 0xff };

				/* CRC32 was OK. Remove it from skb. */
				priv->ule_skb->tail -= 4;
				priv->ule_skb->len -= 4;

				if (!priv->ule_dbit) {
					/*
					 * The destination MAC address is the
					 * next data in the skb.  It comes
					 * before any extension headers.
					 *
					 * Check if the payload of this SNDU
					 * should be passed up the stack.
					 */
					register int drop = 0;
					if (priv->rx_mode != RX_MODE_PROMISC) {
						if (priv->ule_skb->data[0] & 0x01) {
							/* multicast or broadcast */
							if (memcmp(priv->ule_skb->data, bc_addr, ETH_ALEN)) {
								/* multicast */
								if (priv->rx_mode == RX_MODE_MULTI) {
									int i;
									for(i = 0; i < priv->multi_num && memcmp(priv->ule_skb->data, priv->multi_macs[i], ETH_ALEN); i++)
										;
									if (i == priv->multi_num)
										drop = 1;
								} else if (priv->rx_mode != RX_MODE_ALL_MULTI)
									drop = 1; /* no broadcast; */
								/* else: all multicast mode: accept all multicast packets */
							}
							/* else: broadcast */
						}
						else if (memcmp(priv->ule_skb->data, dev->dev_addr, ETH_ALEN))
							drop = 1;
						/* else: destination address matches the MAC address of our receiver device */
					}
					/* else: promiscuous mode; pass everything up the stack */

					if (drop) {
#ifdef ULE_DEBUG
						dprintk("Dropping SNDU: MAC destination address does not match: dest addr: "MAC_ADDR_PRINTFMT", dev addr: "MAC_ADDR_PRINTFMT"\n",
							MAX_ADDR_PRINTFMT_ARGS(priv->ule_skb->data), MAX_ADDR_PRINTFMT_ARGS(dev->dev_addr));
#endif
						dev_kfree_skb(priv->ule_skb);
						goto sndu_done;
					}
					else
					{
						skb_copy_from_linear_data(priv->ule_skb,
							      dest_addr,
							      ETH_ALEN);
						skb_pull(priv->ule_skb, ETH_ALEN);
					}
				}

				/* Handle ULE Extension Headers. */
				if (priv->ule_sndu_type < 1536) {
					/* There is an extension header.  Handle it accordingly. */
					int l = handle_ule_extensions(priv);
					if (l < 0) {
						/* Mandatory extension header unknown or TEST SNDU.  Drop it. */
						// printk( KERN_WARNING "Dropping SNDU, extension headers.\n" );
						dev_kfree_skb(priv->ule_skb);
						goto sndu_done;
					}
					skb_pull(priv->ule_skb, l);
				}

				/*
				 * Construct/assure correct ethernet header.
				 * Note: in bridged mode (priv->ule_bridged !=
				 * 0) we already have the (original) ethernet
				 * header at the start of the payload (after
				 * optional dest. address and any extension
				 * headers).
				 */

				if (!priv->ule_bridged) {
					skb_push(priv->ule_skb, ETH_HLEN);
					ethh = (struct ethhdr *)priv->ule_skb->data;
					if (!priv->ule_dbit) {
						 /* dest_addr buffer is only valid if priv->ule_dbit == 0 */
						memcpy(ethh->h_dest, dest_addr, ETH_ALEN);
						memset(ethh->h_source, 0, ETH_ALEN);
					}
					else /* zeroize source and dest */
						memset( ethh, 0, ETH_ALEN*2 );

					ethh->h_proto = htons(priv->ule_sndu_type);
				}
				/* else:  skb is in correct state; nothing to do. */
				priv->ule_bridged = 0;

				/* Stuff into kernel's protocol stack. */
				priv->ule_skb->protocol = dvb_net_eth_type_trans(priv->ule_skb, dev);
				/* If D-bit is set (i.e. destination MAC address not present),
				 * receive the packet anyhow. */
				/* if (priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
					priv->ule_skb->pkt_type = PACKET_HOST; */
				dev->stats.rx_packets++;
				dev->stats.rx_bytes += priv->ule_skb->len;
				netif_rx(priv->ule_skb);
			}
			sndu_done:
			/* Prepare for next SNDU. */
			reset_ule(priv);
		}

		/* More data in current TS (look at the bytes following the CRC32)? */
		if (ts_remain >= 2 && *((unsigned short *)from_where) != 0xFFFF) {
			/* Next ULE SNDU starts right there. */
			new_ts = 0;
			priv->ule_skb = NULL;
			priv->ule_sndu_type_1 = 0;
			priv->ule_sndu_len = 0;
			// printk(KERN_WARNING "More data in current TS: [%#x %#x %#x %#x]\n",
			//	*(from_where + 0), *(from_where + 1),
			//	*(from_where + 2), *(from_where + 3));
			// printk(KERN_WARNING "ts @ %p, stopped @ %p:\n", ts, from_where + 0);
			// hexdump(ts, 188);
		} else {
			new_ts = 1;
			ts += TS_SZ;
			priv->ts_count++;
			if (priv->ule_skb == NULL) {
				priv->need_pusi = 1;
				priv->ule_sndu_type_1 = 0;
				priv->ule_sndu_len = 0;
			}
		}
	}	/* for all available TS cells */
}

static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
			       const u8 *buffer2, size_t buffer2_len,
			       struct dmx_ts_feed *feed, enum dmx_success success)
{
	struct net_device *dev = feed->priv;

	if (buffer2)
		printk(KERN_WARNING "buffer2 not NULL: %p.\n", buffer2);
	if (buffer1_len > 32768)
		printk(KERN_WARNING "length > 32k: %zu.\n", buffer1_len);
	/* printk("TS callback: %u bytes, %u TS cells @ %p.\n",
		  buffer1_len, buffer1_len / TS_SZ, buffer1); */
	dvb_net_ule(dev, buffer1, buffer1_len);
	return 0;
}


static void dvb_net_sec(struct net_device *dev,
			const u8 *pkt, int pkt_len)
{
	u8 *eth;
	struct sk_buff *skb;
	struct net_device_stats *stats = &dev->stats;
	int snap = 0;

	/* note: pkt_len includes a 32bit checksum */
	if (pkt_len < 16) {
		printk("%s: IP/MPE packet length = %d too small.\n",
			dev->name, pkt_len);
		stats->rx_errors++;
		stats->rx_length_errors++;
		return;
	}
/* it seems some ISPs manage to screw up here, so we have to
 * relax the error checks... */
#if 0
	if ((pkt[5] & 0xfd) != 0xc1) {
		/* drop scrambled or broken packets */
#else
	if ((pkt[5] & 0x3c) != 0x00) {
		/* drop scrambled */
#endif
		stats->rx_errors++;
		stats->rx_crc_errors++;
		return;
	}
	if (pkt[5] & 0x02) {
		/* handle LLC/SNAP, see rfc-1042 */
		if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
			stats->rx_dropped++;
			return;
		}
		snap = 8;
	}
	if (pkt[7]) {
		/* FIXME: assemble datagram from multiple sections */
		stats->rx_errors++;
		stats->rx_frame_errors++;
		return;
	}

	/* we have 14 byte ethernet header (ip header follows);
	 * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
	 */
	if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
		//printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
		stats->rx_dropped++;
		return;
	}
	skb_reserve(skb, 2);    /* longword align L3 header */
	skb->dev = dev;

	/* copy L3 payload */
	eth = (u8 *) skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
	memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);

	/* create ethernet header: */
	eth[0]=pkt[0x0b];
	eth[1]=pkt[0x0a];
	eth[2]=pkt[0x09];
	eth[3]=pkt[0x08];
	eth[4]=pkt[0x04];
	eth[5]=pkt[0x03];

	eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;

	if (snap) {
		eth[12] = pkt[18];
		eth[13] = pkt[19];
	} else {
		/* protocol numbers are from rfc-1700 or
		 * http://www.iana.org/assignments/ethernet-numbers
		 */
		if (pkt[12] >> 4 == 6) { /* version field from IP header */
			eth[12] = 0x86;	/* IPv6 */
			eth[13] = 0xdd;
		} else {
			eth[12] = 0x08;	/* IPv4 */
			eth[13] = 0x00;
		}
	}

	skb->protocol = dvb_net_eth_type_trans(skb, dev);

	stats->rx_packets++;
	stats->rx_bytes+=skb->len;
	netif_rx(skb);
}

static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
		 const u8 *buffer2, size_t buffer2_len,
		 struct dmx_section_filter *filter,
		 enum dmx_success success)
{
	struct net_device *dev = filter->priv;

	/**
	 * we rely on the DVB API definition where exactly one complete
	 * section is delivered in buffer1
	 */
	dvb_net_sec (dev, buffer1, buffer1_len);
	return 0;
}

static int dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
{
	dev_kfree_skb(skb);
	return NETDEV_TX_OK;
}

static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

static int dvb_net_filter_sec_set(struct net_device *dev,
		   struct dmx_section_filter **secfilter,
		   u8 *mac, u8 *mac_mask)
{
	struct dvb_net_priv *priv = netdev_priv(dev);
	int ret;

	*secfilter=NULL;
	ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
	if (ret<0) {
		printk("%s: could not get filter\n", dev->name);
		return ret;
	}

	(*secfilter)->priv=(void *) dev;

	memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
	memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
	memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);

	(*secfilter)->filter_value[0]=0x3e;
	(*secfilter)->filter_value[3]=mac[5];
	(*secfilter)->filter_value[4]=mac[4];
	(*secfilter)->filter_value[8]=mac[3];
	(*secfilter)->filter_value[9]=mac[2];
	(*secfilter)->filter_value[10]=mac[1];
	(*secfilter)->filter_value[11]=mac[0];

	(*secfilter)->filter_mask[0] = 0xff;
	(*secfilter)->filter_mask[3] = mac_mask[5];
	(*secfilter)->filter_mask[4] = mac_mask[4];
	(*secfilter)->filter_mask[8] = mac_mask[3];
	(*secfilter)->filter_mask[9] = mac_mask[2];
	(*secfilter)->filter_mask[10] = mac_mask[1];
	(*secfilter)->filter_mask[11]=mac_mask[0];

	dprintk("%s: filter mac=%pM\n", dev->name, mac);
	dprintk("%s: filter mask=%pM\n", dev->name, mac_mask);

	return 0;
}

static int dvb_net_feed_start(struct net_device *dev)
{
	int ret = 0, i;
	struct dvb_net_priv *priv = netdev_priv(dev);
	struct dmx_demux *demux = priv->demux;
	unsigned char *mac = (unsigned char *) dev->dev_addr;

	dprintk("%s: rx_mode %i\n", __func__, priv->rx_mode);
	mutex_lock(&priv->mutex);
	if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
		printk("%s: BUG %d\n", __func__, __LINE__);

	priv->secfeed=NULL;
	priv->secfilter=NULL;
	priv->tsfeed = NULL;

	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
		dprintk("%s: alloc secfeed\n", __func__);
		ret=demux->allocate_section_feed(demux, &priv->secfeed,
					 dvb_net_sec_callback);
		if (ret<0) {
			printk("%s: could not allocate section feed\n", dev->name);
			goto error;
		}

		ret = priv->secfeed->set(priv->secfeed, priv->pid, 32768, 1);

		if (ret<0) {
			printk("%s: could not set section feed\n", dev->name);
			priv->demux->release_section_feed(priv->demux, priv->secfeed);
			priv->secfeed=NULL;
			goto error;
		}

		if (priv->rx_mode != RX_MODE_PROMISC) {
			dprintk("%s: set secfilter\n", __func__);
			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
		}

		switch (priv->rx_mode) {
		case RX_MODE_MULTI:
			for (i = 0; i < priv->multi_num; i++) {
				dprintk("%s: set multi_secfilter[%d]\n", __func__, i);
				dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
						       priv->multi_macs[i], mask_normal);
			}
			break;
		case RX_MODE_ALL_MULTI:
			priv->multi_num=1;
			dprintk("%s: set multi_secfilter[0]\n", __func__);
			dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
					       mac_allmulti, mask_allmulti);
			break;
		case RX_MODE_PROMISC:
			priv->multi_num=0;
			dprintk("%s: set secfilter\n", __func__);
			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
			break;
		}

		dprintk("%s: start filtering\n", __func__);
		priv->secfeed->start_filtering(priv->secfeed);
	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
		struct timespec timeout = { 0, 10000000 }; // 10 msec

		/* we have payloads encapsulated in TS */
		dprintk("%s: alloc tsfeed\n", __func__);
		ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
		if (ret < 0) {
			printk("%s: could not allocate ts feed\n", dev->name);
			goto error;
		}

		/* Set netdevice pointer for ts decaps callback. */
		priv->tsfeed->priv = (void *)dev;
		ret = priv->tsfeed->set(priv->tsfeed,
					priv->pid, /* pid */
					TS_PACKET, /* type */
					DMX_TS_PES_OTHER, /* pes type */
					32768,     /* circular buffer size */
					timeout    /* timeout */
					);

		if (ret < 0) {
			printk("%s: could not set ts feed\n", dev->name);
			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
			priv->tsfeed = NULL;
			goto error;
		}

		dprintk("%s: start filtering\n", __func__);
		priv->tsfeed->start_filtering(priv->tsfeed);
	} else
		ret = -EINVAL;

error:
	mutex_unlock(&priv->mutex);
	return ret;
}

static int dvb_net_feed_stop(struct net_device *dev)
{
	struct dvb_net_priv *priv = netdev_priv(dev);
	int i, ret = 0;

	dprintk("%s\n", __func__);
	mutex_lock(&priv->mutex);
	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
		if (priv->secfeed) {
			if (priv->secfeed->is_filtering) {
				dprintk("%s: stop secfeed\n", __func__);
				priv->secfeed->stop_filtering(priv->secfeed);
			}

			if (priv->secfilter) {
				dprintk("%s: release secfilter\n", __func__);
				priv->secfeed->release_filter(priv->secfeed,
							      priv->secfilter);
				priv->secfilter=NULL;
			}

			for (i=0; i<priv->multi_num; i++) {
				if (priv->multi_secfilter[i]) {
					dprintk("%s: release multi_filter[%d]\n",
						__func__, i);
					priv->secfeed->release_filter(priv->secfeed,
								      priv->multi_secfilter[i]);
					priv->multi_secfilter[i] = NULL;
				}
			}

			priv->demux->release_section_feed(priv->demux, priv->secfeed);
			priv->secfeed = NULL;
		} else
			printk("%s: no feed to stop\n", dev->name);
	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
		if (priv->tsfeed) {
			if (priv->tsfeed->is_filtering) {
				dprintk("%s: stop tsfeed\n", __func__);
				priv->tsfeed->stop_filtering(priv->tsfeed);
			}
			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
			priv->tsfeed = NULL;
		}
		else
			printk("%s: no ts feed to stop\n", dev->name);
	} else
		ret = -EINVAL;
	mutex_unlock(&priv->mutex);
	return ret;
}


static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
{
	struct dvb_net_priv *priv = netdev_priv(dev);

	if (priv->multi_num == DVB_NET_MULTICAST_MAX)
		return -ENOMEM;

	memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);

	priv->multi_num++;
	return 0;
}


static void wq_set_multicast_list (struct work_struct *work)
{
	struct dvb_net_priv *priv =
		container_of(work, struct dvb_net_priv, set_multicast_list_wq);
	struct net_device *dev = priv->net;

	dvb_net_feed_stop(dev);
	priv->rx_mode = RX_MODE_UNI;
	netif_addr_lock_bh(dev);

	if (dev->flags & IFF_PROMISC) {
		dprintk("%s: promiscuous mode\n", dev->name);
		priv->rx_mode = RX_MODE_PROMISC;
	} else if ((dev->flags & IFF_ALLMULTI)) {
		dprintk("%s: allmulti mode\n", dev->name);
		priv->rx_mode = RX_MODE_ALL_MULTI;
	} else if (!netdev_mc_empty(dev)) {
		struct netdev_hw_addr *ha;

		dprintk("%s: set_mc_list, %d entries\n",
			dev->name, netdev_mc_count(dev));

		priv->rx_mode = RX_MODE_MULTI;
		priv->multi_num = 0;

		netdev_for_each_mc_addr(ha, dev)
			dvb_set_mc_filter(dev, ha->addr);
	}

	netif_addr_unlock_bh(dev);
	dvb_net_feed_start(dev);
}


static void dvb_net_set_multicast_list (struct net_device *dev)
{
	struct dvb_net_priv *priv = netdev_priv(dev);
	schedule_work(&priv->set_multicast_list_wq);
}


static void wq_restart_net_feed (struct work_struct *work)
{
	struct dvb_net_priv *priv =
		container_of(work, struct dvb_net_priv, restart_net_feed_wq);
	struct net_device *dev = priv->net;

	if (netif_running(dev)) {
		dvb_net_feed_stop(dev);
		dvb_net_feed_start(dev);
	}
}


static int dvb_net_set_mac (struct net_device *dev, void *p)
{
	struct dvb_net_priv *priv = netdev_priv(dev);
	struct sockaddr *addr=p;

	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

	if (netif_running(dev))
		schedule_work(&priv->restart_net_feed_wq);

	return 0;
}


static int dvb_net_open(struct net_device *dev)
{
	struct dvb_net_priv *priv = netdev_priv(dev);

	priv->in_use++;
	dvb_net_feed_start(dev);
	return 0;
}


static int dvb_net_stop(struct net_device *dev)
{
	struct dvb_net_priv *priv = netdev_priv(dev);

	priv->in_use--;
	return dvb_net_feed_stop(dev);
}

static const struct header_ops dvb_header_ops = {
	.create		= eth_header,
	.parse		= eth_header_parse,
	.rebuild	= eth_rebuild_header,
};


static const struct net_device_ops dvb_netdev_ops = {
	.ndo_open		= dvb_net_open,
	.ndo_stop		= dvb_net_stop,
	.ndo_start_xmit		= dvb_net_tx,
	.ndo_set_rx_mode	= dvb_net_set_multicast_list,
	.ndo_set_mac_address    = dvb_net_set_mac,
	.ndo_change_mtu		= eth_change_mtu,
	.ndo_validate_addr	= eth_validate_addr,
};

static void dvb_net_setup(struct net_device *dev)
{
	ether_setup(dev);

	dev->header_ops		= &dvb_header_ops;
	dev->netdev_ops		= &dvb_netdev_ops;
	dev->mtu		= 4096;

	dev->flags |= IFF_NOARP;
}

static int get_if(struct dvb_net *dvbnet)
{
	int i;

	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
		if (!dvbnet->state[i])
			break;

	if (i == DVB_NET_DEVICES_MAX)
		return -1;

	dvbnet->state[i]=1;
	return i;
}

static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
{
	struct net_device *net;
	struct dvb_net_priv *priv;
	int result;
	int if_num;

	if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
		return -EINVAL;
	if ((if_num = get_if(dvbnet)) < 0)
		return -EINVAL;

	net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb", dvb_net_setup);
	if (!net)
		return -ENOMEM;

	if (dvbnet->dvbdev->id)
		snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
			 dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
	else
		/* compatibility fix to keep dvb0_0 format */
		snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
			 dvbnet->dvbdev->adapter->num, if_num);

	net->addr_len = 6;
	memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);

	dvbnet->device[if_num] = net;

	priv = netdev_priv(net);
	priv->net = net;
	priv->demux = dvbnet->demux;
	priv->pid = pid;
	priv->rx_mode = RX_MODE_UNI;
	priv->need_pusi = 1;
	priv->tscc = 0;
	priv->feedtype = feedtype;
	reset_ule(priv);

	INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
	INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
	mutex_init(&priv->mutex);

	net->base_addr = pid;

	if ((result = register_netdev(net)) < 0) {
		dvbnet->device[if_num] = NULL;
		free_netdev(net);
		return result;
	}
	printk("dvb_net: created network interface %s\n", net->name);

	return if_num;
}

static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
{
	struct net_device *net = dvbnet->device[num];
	struct dvb_net_priv *priv;

	if (!dvbnet->state[num])
		return -EINVAL;
	priv = netdev_priv(net);
	if (priv->in_use)
		return -EBUSY;

	dvb_net_stop(net);
	flush_work(&priv->set_multicast_list_wq);
	flush_work(&priv->restart_net_feed_wq);
	printk("dvb_net: removed network interface %s\n", net->name);
	unregister_netdev(net);
	dvbnet->state[num]=0;
	dvbnet->device[num] = NULL;
	free_netdev(net);

	return 0;
}

static int dvb_net_do_ioctl(struct file *file,
		  unsigned int cmd, void *parg)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_net *dvbnet = dvbdev->priv;
	int ret = 0;

	if (((file->f_flags&O_ACCMODE)==O_RDONLY))
		return -EPERM;

	if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
		return -ERESTARTSYS;

	switch (cmd) {
	case NET_ADD_IF:
	{
		struct dvb_net_if *dvbnetif = parg;
		int result;

		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto ioctl_error;
		}

		if (!try_module_get(dvbdev->adapter->module)) {
			ret = -EPERM;
			goto ioctl_error;
		}

		result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
		if (result<0) {
			module_put(dvbdev->adapter->module);
			ret = result;
			goto ioctl_error;
		}
		dvbnetif->if_num=result;
		break;
	}
	case NET_GET_IF:
	{
		struct net_device *netdev;
		struct dvb_net_priv *priv_data;
		struct dvb_net_if *dvbnetif = parg;

		if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
		    !dvbnet->state[dvbnetif->if_num]) {
			ret = -EINVAL;
			goto ioctl_error;
		}

		netdev = dvbnet->device[dvbnetif->if_num];

		priv_data = netdev_priv(netdev);
		dvbnetif->pid=priv_data->pid;
		dvbnetif->feedtype=priv_data->feedtype;
		break;
	}
	case NET_REMOVE_IF:
	{
		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto ioctl_error;
		}
		if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
			ret = -EINVAL;
			goto ioctl_error;
		}
		ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
		if (!ret)
			module_put(dvbdev->adapter->module);
		break;
	}

	/* binary compatibility cruft */
	case __NET_ADD_IF_OLD:
	{
		struct __dvb_net_if_old *dvbnetif = parg;
		int result;

		if (!capable(CAP_SYS_ADMIN)) {
			ret = -EPERM;
			goto ioctl_error;
		}

		if (!try_module_get(dvbdev->adapter->module)) {
			ret = -EPERM;
			goto ioctl_error;
		}

		result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
		if (result<0) {
			module_put(dvbdev->adapter->module);
			ret = result;
			goto ioctl_error;
		}
		dvbnetif->if_num=result;
		break;
	}
	case __NET_GET_IF_OLD:
	{
		struct net_device *netdev;
		struct dvb_net_priv *priv_data;
		struct __dvb_net_if_old *dvbnetif = parg;

		if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
		    !dvbnet->state[dvbnetif->if_num]) {
			ret = -EINVAL;
			goto ioctl_error;
		}

		netdev = dvbnet->device[dvbnetif->if_num];

		priv_data = netdev_priv(netdev);
		dvbnetif->pid=priv_data->pid;
		break;
	}
	default:
		ret = -ENOTTY;
		break;
	}

ioctl_error:
	mutex_unlock(&dvbnet->ioctl_mutex);
	return ret;
}

static long dvb_net_ioctl(struct file *file,
	      unsigned int cmd, unsigned long arg)
{
	return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
}

static int dvb_net_close(struct inode *inode, struct file *file)
{
	struct dvb_device *dvbdev = file->private_data;
	struct dvb_net *dvbnet = dvbdev->priv;

	dvb_generic_release(inode, file);

	if(dvbdev->users == 1 && dvbnet->exit == 1) {
		fops_put(file->f_op);
		file->f_op = NULL;
		wake_up(&dvbdev->wait_queue);
	}
	return 0;
}


static const struct file_operations dvb_net_fops = {
	.owner = THIS_MODULE,
	.unlocked_ioctl = dvb_net_ioctl,
	.open =	dvb_generic_open,
	.release = dvb_net_close,
	.llseek = noop_llseek,
};

static struct dvb_device dvbdev_net = {
	.priv = NULL,
	.users = 1,
	.writers = 1,
	.fops = &dvb_net_fops,
};


void dvb_net_release (struct dvb_net *dvbnet)
{
	int i;

	dvbnet->exit = 1;
	if (dvbnet->dvbdev->users < 1)
		wait_event(dvbnet->dvbdev->wait_queue,
				dvbnet->dvbdev->users==1);

	dvb_unregister_device(dvbnet->dvbdev);

	for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
		if (!dvbnet->state[i])
			continue;
		dvb_net_remove_if(dvbnet, i);
	}
}
EXPORT_SYMBOL(dvb_net_release);


int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
		  struct dmx_demux *dmx)
{
	int i;

	mutex_init(&dvbnet->ioctl_mutex);
	dvbnet->demux = dmx;

	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
		dvbnet->state[i] = 0;

	return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
			     dvbnet, DVB_DEVICE_NET);
}
EXPORT_SYMBOL(dvb_net_init);
OpenPOWER on IntegriCloud