Linux Audio

Check our new training course

Embedded Linux Audio

Check our new training course
with Creative Commons CC-BY-SA
lecture materials

Bootlin logo

Elixir Cross Referencer

Loading...
   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
/*
 * 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_sync(&priv->set_multicast_list_wq);
	flush_work_sync(&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;

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

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

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (!try_module_get(dvbdev->adapter->module))
			return -EPERM;

		result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
		if (result<0) {
			module_put(dvbdev->adapter->module);
			return result;
		}
		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])
			return -EINVAL;

		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:
	{
		int ret;

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;
		if ((unsigned long) parg >= DVB_NET_DEVICES_MAX)
			return -EINVAL;
		ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
		if (!ret)
			module_put(dvbdev->adapter->module);
		return ret;
	}

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

		if (!capable(CAP_SYS_ADMIN))
			return -EPERM;

		if (!try_module_get(dvbdev->adapter->module))
			return -EPERM;

		result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
		if (result<0) {
			module_put(dvbdev->adapter->module);
			return result;
		}
		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])
			return -EINVAL;

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

		priv_data = netdev_priv(netdev);
		dvbnetif->pid=priv_data->pid;
		break;
	}
	default:
		return -ENOTTY;
	}
	return 0;
}

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;

	dvbnet->demux = dmx;

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

	dvb_register_device (adap, &dvbnet->dvbdev, &dvbdev_net,
			     dvbnet, DVB_DEVICE_NET);

	return 0;
}
EXPORT_SYMBOL(dvb_net_init);