forked from torvalds/linux
-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathdvb_net.c
1619 lines (1392 loc) · 41.3 KB
/
dvb_net.c
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
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* dvb_net.c
*
* Copyright (C) 2001 Convergence integrated media GmbH
* Ralph Metzler <[email protected]>
* Copyright (C) 2002 Ralph Metzler <[email protected]>
*
* ULE Decapsulation code:
* Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
* and Department of Scientific Computing
* Paris Lodron University of Salzburg.
* Hilmar Linder <[email protected]>
* and Wolfram Stering <[email protected]>
*
* ULE Decaps according to RFC 4326.
*/
/*
* 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)
* DVB_ULE_DEBUG compile-time option.
* Apr 2006: cp v3: Bugfixes and compliency with RFC 4326 (ULE) by
* Christian Praehauser <[email protected]>,
* 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.
*
*/
#define pr_fmt(fmt) "dvb_net: " fmt
#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 <linux/uaccess.h>
#include <linux/crc32.h>
#include <linux/mutex.h>
#include <linux/sched.h>
#include <media/dvb_demux.h>
#include <media/dvb_net.h>
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
#ifdef DVB_ULE_DEBUG
/*
* The code inside DVB_ULE_DEBUG keeps a history of the
* last 100 TS cells processed.
*/
static unsigned char ule_hist[100*TS_SZ] = { 0 };
static unsigned char *ule_where = ule_hist, ule_dump;
static void hexdump(const unsigned char *buf, unsigned short len)
{
print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
}
#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 <[email protected]>
*/
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(ether_addr_equal(eth->h_dest,dev->broadcast))
skb->pkt_type=PACKET_BROADCAST;
else
skb->pkt_type=PACKET_MULTICAST;
}
if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
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) < ETH_P_802_3_MIN) {
int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
/* A frame Type < ETH_P_802_3_MIN 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;
pr_debug("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);
} while (p->ule_sndu_type < ETH_P_802_3_MIN);
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.
*/
struct dvb_net_ule_handle {
struct net_device *dev;
struct dvb_net_priv *priv;
struct ethhdr *ethh;
const u8 *buf;
size_t buf_len;
unsigned long skipped;
const u8 *ts, *ts_end, *from_where;
u8 ts_remain, how_much, new_ts;
bool error;
};
static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
{
/* We are about to process a new TS cell. */
#ifdef DVB_ULE_DEBUG
if (ule_where >= &ule_hist[100*TS_SZ])
ule_where = ule_hist;
memcpy(ule_where, h->ts, TS_SZ);
if (ule_dump) {
hexdump(ule_where, TS_SZ);
ule_dump = 0;
}
ule_where += TS_SZ;
#endif
/*
* Check TS h->error conditions: sync_byte, transport_error_indicator,
* scrambling_control .
*/
if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
((h->ts[3] & TS_SC) != 0)) {
pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
h->priv->ts_count, h->ts[0],
(h->ts[1] & TS_TEI) >> 7,
(h->ts[3] & TS_SC) >> 6);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (h->priv->ule_skb) {
dev_kfree_skb(h->priv->ule_skb);
/* Prepare for next SNDU. */
h->dev->stats.rx_errors++;
h->dev->stats.rx_frame_errors++;
}
reset_ule(h->priv);
h->priv->need_pusi = 1;
/* Continue with next TS cell. */
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
h->ts_remain = 184;
h->from_where = h->ts + 4;
return 0;
}
static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
{
if (h->ts[1] & TS_PUSI) {
/* Find beginning of first ULE SNDU in current TS cell. */
/* Synchronize continuity counter. */
h->priv->tscc = h->ts[3] & 0x0F;
/* There is a pointer field here. */
if (h->ts[4] > h->ts_remain) {
pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
h->priv->ts_count, h->ts[4]);
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
/* Skip to destination of pointer field. */
h->from_where = &h->ts[5] + h->ts[4];
h->ts_remain -= 1 + h->ts[4];
h->skipped = 0;
} else {
h->skipped++;
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
return 0;
}
static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
{
/* Check continuity counter. */
if ((h->ts[3] & 0x0F) == h->priv->tscc)
h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
else {
/* TS discontinuity handling: */
pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
h->priv->ts_count, h->ts[3] & 0x0F,
h->priv->tscc);
/* Drop partly decoded SNDU, reset state, resync on PUSI. */
if (h->priv->ule_skb) {
dev_kfree_skb(h->priv->ule_skb);
/* Prepare for next SNDU. */
// reset_ule(h->priv); moved to below.
h->dev->stats.rx_errors++;
h->dev->stats.rx_frame_errors++;
}
reset_ule(h->priv);
/* skip to next PUSI. */
h->priv->need_pusi = 1;
return 1;
}
/*
* 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 (h->ts[1] & TS_PUSI) {
if (!h->priv->need_pusi) {
if (!(*h->from_where < (h->ts_remain-1)) ||
*h->from_where != h->priv->ule_sndu_remain) {
/*
* Pointer field is invalid.
* Drop this TS cell and any started ULE SNDU.
*/
pr_warn("%lu: Invalid pointer field: %u.\n",
h->priv->ts_count,
*h->from_where);
/*
* Drop partly decoded SNDU, reset state,
* resync on PUSI.
*/
if (h->priv->ule_skb) {
h->error = true;
dev_kfree_skb(h->priv->ule_skb);
}
if (h->error || h->priv->ule_sndu_remain) {
h->dev->stats.rx_errors++;
h->dev->stats.rx_frame_errors++;
h->error = false;
}
reset_ule(h->priv);
h->priv->need_pusi = 1;
return 1;
}
/*
* Skip pointer field (we're processing a
* packed payload).
*/
h->from_where += 1;
h->ts_remain -= 1;
} else
h->priv->need_pusi = 0;
if (h->priv->ule_sndu_remain > 183) {
/*
* Current SNDU lacks more data than there
* could be available in the current TS cell.
*/
h->dev->stats.rx_errors++;
h->dev->stats.rx_length_errors++;
pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d). Flushing incomplete payload.\n",
h->priv->ts_count,
h->priv->ule_sndu_remain,
h->ts[4], h->ts_remain);
dev_kfree_skb(h->priv->ule_skb);
/* Prepare for next SNDU. */
reset_ule(h->priv);
/*
* Resync: go to where pointer field points to:
* start of next ULE SNDU.
*/
h->from_where += h->ts[4];
h->ts_remain -= h->ts[4];
}
}
return 0;
}
/*
* 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 h.ts_remain has to be >= 2 here.
*/
static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
{
if (h->ts_remain < 2) {
pr_warn("Invalid payload packing: only %d bytes left in TS. Resyncing.\n",
h->ts_remain);
h->priv->ule_sndu_len = 0;
h->priv->need_pusi = 1;
h->ts += TS_SZ;
return 1;
}
if (!h->priv->ule_sndu_len) {
/* Got at least two bytes, thus extrace the SNDU length. */
h->priv->ule_sndu_len = h->from_where[0] << 8 |
h->from_where[1];
if (h->priv->ule_sndu_len & 0x8000) {
/* D-Bit is set: no dest mac present. */
h->priv->ule_sndu_len &= 0x7FFF;
h->priv->ule_dbit = 1;
} else
h->priv->ule_dbit = 0;
if (h->priv->ule_sndu_len < 5) {
pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
h->priv->ts_count,
h->priv->ule_sndu_len);
h->dev->stats.rx_errors++;
h->dev->stats.rx_length_errors++;
h->priv->ule_sndu_len = 0;
h->priv->need_pusi = 1;
h->new_ts = 1;
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
}
h->ts_remain -= 2; /* consume the 2 bytes SNDU length. */
h->from_where += 2;
}
h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
/*
* State of current TS:
* h->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 (h->ts_remain) {
case 1:
h->priv->ule_sndu_remain--;
h->priv->ule_sndu_type = h->from_where[0] << 8;
/* first byte of ule_type is set. */
h->priv->ule_sndu_type_1 = 1;
h->ts_remain -= 1;
h->from_where += 1;
/* fallthrough */
case 0:
h->new_ts = 1;
h->ts += TS_SZ;
h->priv->ts_count++;
return 1;
default: /* complete ULE header is present in current TS. */
/* Extract ULE type field. */
if (h->priv->ule_sndu_type_1) {
h->priv->ule_sndu_type_1 = 0;
h->priv->ule_sndu_type |= h->from_where[0];
h->from_where += 1; /* points to payload start. */
h->ts_remain -= 1;
} else {
/* Complete type is present in new TS. */
h->priv->ule_sndu_type = h->from_where[0] << 8 |
h->from_where[1];
h->from_where += 2; /* points to payload start. */
h->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).
*/
h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
ETH_HLEN + ETH_ALEN);
if (!h->priv->ule_skb) {
pr_notice("%s: Memory squeeze, dropping packet.\n",
h->dev->name);
h->dev->stats.rx_dropped++;
return -1;
}
/* This includes the CRC32 _and_ dest mac, if !dbit. */
h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
h->priv->ule_skb->dev = h->dev;
/*
* Leave space for Ethernet or bridged SNDU header
* (eth hdr plus one MAC addr).
*/
skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
return 0;
}
static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
{
static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
/*
* 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.
*/
if (h->priv->rx_mode == RX_MODE_PROMISC)
return 0;
if (h->priv->ule_skb->data[0] & 0x01) {
/* multicast or broadcast */
if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
/* multicast */
if (h->priv->rx_mode == RX_MODE_MULTI) {
int i;
for (i = 0; i < h->priv->multi_num &&
!ether_addr_equal(h->priv->ule_skb->data,
h->priv->multi_macs[i]);
i++)
;
if (i == h->priv->multi_num)
return 1;
} else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
return 1; /* no broadcast; */
/*
* else:
* all multicast mode: accept all multicast packets
*/
}
/* else: broadcast */
} else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
return 1;
return 0;
}
static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
struct kvec iov[3],
u32 ule_crc, u32 expected_crc)
{
u8 dest_addr[ETH_ALEN];
if (ule_crc != expected_crc) {
pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
h->priv->ts_count, ule_crc, expected_crc,
h->priv->ule_sndu_len, h->priv->ule_sndu_type,
h->ts_remain,
h->ts_remain > 2 ?
*(unsigned short *)h->from_where : 0);
#ifdef DVB_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
h->dev->stats.rx_errors++;
h->dev->stats.rx_crc_errors++;
dev_kfree_skb(h->priv->ule_skb);
return;
}
/* CRC32 verified OK. */
/* CRC32 was OK, so remove it from skb. */
h->priv->ule_skb->tail -= 4;
h->priv->ule_skb->len -= 4;
if (!h->priv->ule_dbit) {
if (dvb_net_ule_should_drop(h)) {
netdev_dbg(h->dev,
"Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
h->priv->ule_skb->data, h->dev->dev_addr);
dev_kfree_skb(h->priv->ule_skb);
return;
}
skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
ETH_ALEN);
skb_pull(h->priv->ule_skb, ETH_ALEN);
} else {
/* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
eth_zero_addr(dest_addr);
}
/* Handle ULE Extension Headers. */
if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
/* There is an extension header. Handle it accordingly. */
int l = handle_ule_extensions(h->priv);
if (l < 0) {
/*
* Mandatory extension header unknown or TEST SNDU.
* Drop it.
*/
// pr_warn("Dropping SNDU, extension headers.\n" );
dev_kfree_skb(h->priv->ule_skb);
return;
}
skb_pull(h->priv->ule_skb, l);
}
/*
* Construct/assure correct ethernet header.
* Note: in bridged mode (h->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 (!h->priv->ule_bridged) {
skb_push(h->priv->ule_skb, ETH_HLEN);
h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
eth_zero_addr(h->ethh->h_source);
h->ethh->h_proto = htons(h->priv->ule_sndu_type);
}
/* else: skb is in correct state; nothing to do. */
h->priv->ule_bridged = 0;
/* Stuff into kernel's protocol stack. */
h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
h->dev);
/*
* If D-bit is set (i.e. destination MAC address not present),
* receive the packet anyhow.
*/
#if 0
if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
h->priv->ule_skb->pkt_type = PACKET_HOST;
#endif
h->dev->stats.rx_packets++;
h->dev->stats.rx_bytes += h->priv->ule_skb->len;
netif_rx(h->priv->ule_skb);
}
static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
{
int ret;
struct dvb_net_ule_handle h = {
.dev = dev,
.priv = netdev_priv(dev),
.ethh = NULL,
.buf = buf,
.buf_len = buf_len,
.skipped = 0L,
.ts = NULL,
.ts_end = NULL,
.from_where = NULL,
.ts_remain = 0,
.how_much = 0,
.new_ts = 1,
.error = false,
};
/*
* For all TS cells in current buffer.
* Appearently, we are called for every single TS cell.
*/
for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
h.ts < h.ts_end; /* no incr. */) {
if (h.new_ts) {
/* We are about to process a new TS cell. */
if (dvb_net_ule_new_ts_cell(&h))
continue;
}
/* Synchronize on PUSI, if required. */
if (h.priv->need_pusi) {
if (dvb_net_ule_ts_pusi(&h))
continue;
}
if (h.new_ts) {
if (dvb_net_ule_new_ts(&h))
continue;
}
/* Check if new payload needs to be started. */
if (h.priv->ule_skb == NULL) {
ret = dvb_net_ule_new_payload(&h);
if (ret < 0)
return;
if (ret)
continue;
}
/* Copy data into our current skb. */
h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
h.priv->ule_sndu_remain -= h.how_much;
h.ts_remain -= h.how_much;
h.from_where += h.how_much;
/* Check for complete payload. */
if (h.priv->ule_sndu_remain <= 0) {
/* Check CRC32, we've got it in our skb already. */
__be16 ulen = htons(h.priv->ule_sndu_len);
__be16 utype = htons(h.priv->ule_sndu_type);
const u8 *tail;
struct kvec iov[3] = {
{ &ulen, sizeof ulen },
{ &utype, sizeof utype },
{ h.priv->ule_skb->data,
h.priv->ule_skb->len - 4 }
};
u32 ule_crc = ~0L, expected_crc;
if (h.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(h.priv->ule_skb);
expected_crc = *(tail - 4) << 24 |
*(tail - 3) << 16 |
*(tail - 2) << 8 |
*(tail - 1);
dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
/* Prepare for next SNDU. */
reset_ule(h.priv);
}
/* More data in current TS (look at the bytes following the CRC32)? */
if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
/* Next ULE SNDU starts right there. */
h.new_ts = 0;
h.priv->ule_skb = NULL;
h.priv->ule_sndu_type_1 = 0;
h.priv->ule_sndu_len = 0;
// pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
// *(h.from_where + 0), *(h.from_where + 1),
// *(h.from_where + 2), *(h.from_where + 3));
// pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
// hexdump(h.ts, 188);
} else {
h.new_ts = 1;
h.ts += TS_SZ;
h.priv->ts_count++;
if (h.priv->ule_skb == NULL) {
h.priv->need_pusi = 1;
h.priv->ule_sndu_type_1 = 0;
h.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,
u32 *buffer_flags)
{
struct net_device *dev = feed->priv;
if (buffer2)
pr_warn("buffer2 not NULL: %p.\n", buffer2);
if (buffer1_len > 32768)
pr_warn("length > 32k: %zu.\n", buffer1_len);
/* pr_info("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) {
pr_warn("%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))) {
//pr_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 = 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, u32 *buffer_flags)
{
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 netdev_tx_t dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
{
dev_kfree_skb(skb);
return NETDEV_TX_OK;