1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * dvb_net.c
4 *
5 * Copyright (C) 2001 Convergence integrated media GmbH
6 * Ralph Metzler <ralph@convergence.de>
7 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
8 *
9 * ULE Decapsulation code:
10 * Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
11 * and Department of Scientific Computing
12 * Paris Lodron University of Salzburg.
13 * Hilmar Linder <hlinder@cosy.sbg.ac.at>
14 * and Wolfram Stering <wstering@cosy.sbg.ac.at>
15 *
16 * ULE Decaps according to RFC 4326.
17 */
18
19 /*
20 * ULE ChangeLog:
21 * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
22 *
23 * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
24 * ULE Extension header handling.
25 * Bugreports by Moritz Vieth and Hanno Tersteegen,
26 * Fraunhofer Institute for Open Communication Systems
27 * Competence Center for Advanced Satellite Communications.
28 * Bugfixes and robustness improvements.
29 * Filtering on dest MAC addresses, if present (D-Bit = 0)
30 * DVB_ULE_DEBUG compile-time option.
31 * Apr 2006: cp v3: Bugfixes and compliency with RFC 4326 (ULE) by
32 * Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
33 * Paris Lodron University of Salzburg.
34 */
35
36 /*
37 * FIXME / TODO (dvb_net.c):
38 *
39 * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
40 *
41 */
42
43 #define pr_fmt(fmt) "dvb_net: " fmt
44
45 #include <linux/module.h>
46 #include <linux/kernel.h>
47 #include <linux/netdevice.h>
48 #include <linux/nospec.h>
49 #include <linux/etherdevice.h>
50 #include <linux/dvb/net.h>
51 #include <linux/uio.h>
52 #include <linux/uaccess.h>
53 #include <linux/crc32.h>
54 #include <linux/mutex.h>
55 #include <linux/sched.h>
56
57 #include <media/dvb_demux.h>
58 #include <media/dvb_net.h>
59
iov_crc32(__u32 c,struct kvec * iov,unsigned int cnt)60 static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
61 {
62 unsigned int j;
63 for (j = 0; j < cnt; j++)
64 c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
65 return c;
66 }
67
68
69 #define DVB_NET_MULTICAST_MAX 10
70
71 #ifdef DVB_ULE_DEBUG
72 /*
73 * The code inside DVB_ULE_DEBUG keeps a history of the
74 * last 100 TS cells processed.
75 */
76 static unsigned char ule_hist[100*TS_SZ] = { 0 };
77 static unsigned char *ule_where = ule_hist, ule_dump;
78
hexdump(const unsigned char * buf,unsigned short len)79 static void hexdump(const unsigned char *buf, unsigned short len)
80 {
81 print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
82 }
83 #endif
84
85 struct dvb_net_priv {
86 int in_use;
87 u16 pid;
88 struct net_device *net;
89 struct dvb_net *host;
90 struct dmx_demux *demux;
91 struct dmx_section_feed *secfeed;
92 struct dmx_section_filter *secfilter;
93 struct dmx_ts_feed *tsfeed;
94 int multi_num;
95 struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
96 unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
97 int rx_mode;
98 #define RX_MODE_UNI 0
99 #define RX_MODE_MULTI 1
100 #define RX_MODE_ALL_MULTI 2
101 #define RX_MODE_PROMISC 3
102 struct work_struct set_multicast_list_wq;
103 struct work_struct restart_net_feed_wq;
104 unsigned char feedtype; /* Either FEED_TYPE_ or FEED_TYPE_ULE */
105 int need_pusi; /* Set to 1, if synchronization on PUSI required. */
106 unsigned char tscc; /* TS continuity counter after sync on PUSI. */
107 struct sk_buff *ule_skb; /* ULE SNDU decodes into this buffer. */
108 unsigned char *ule_next_hdr; /* Pointer into skb to next ULE extension header. */
109 unsigned short ule_sndu_len; /* ULE SNDU length in bytes, w/o D-Bit. */
110 unsigned short ule_sndu_type; /* ULE SNDU type field, complete. */
111 unsigned char ule_sndu_type_1; /* ULE SNDU type field, if split across 2 TS cells. */
112 unsigned char ule_dbit; /* Whether the DestMAC address present
113 * or not (bit is set). */
114 unsigned char ule_bridged; /* Whether the ULE_BRIDGED extension header was found. */
115 int ule_sndu_remain; /* Nr. of bytes still required for current ULE SNDU. */
116 unsigned long ts_count; /* Current ts cell counter. */
117 struct mutex mutex;
118 };
119
120
121 /*
122 * Determine the packet's protocol ID. The rule here is that we
123 * assume 802.3 if the type field is short enough to be a length.
124 * This is normal practice and works for any 'now in use' protocol.
125 *
126 * stolen from eth.c out of the linux kernel, hacked for dvb-device
127 * by Michael Holzt <kju@debian.org>
128 */
dvb_net_eth_type_trans(struct sk_buff * skb,struct net_device * dev)129 static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
130 struct net_device *dev)
131 {
132 struct ethhdr *eth;
133 unsigned char *rawp;
134
135 skb_reset_mac_header(skb);
136 skb_pull(skb,dev->hard_header_len);
137 eth = eth_hdr(skb);
138
139 if (*eth->h_dest & 1) {
140 if(ether_addr_equal(eth->h_dest,dev->broadcast))
141 skb->pkt_type=PACKET_BROADCAST;
142 else
143 skb->pkt_type=PACKET_MULTICAST;
144 }
145
146 if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
147 return eth->h_proto;
148
149 rawp = skb->data;
150
151 /*
152 * This is a magic hack to spot IPX packets. Older Novell breaks
153 * the protocol design and runs IPX over 802.3 without an 802.2 LLC
154 * layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
155 * won't work for fault tolerant netware but does for the rest.
156 */
157 if (*(unsigned short *)rawp == 0xFFFF)
158 return htons(ETH_P_802_3);
159
160 /*
161 * Real 802.2 LLC
162 */
163 return htons(ETH_P_802_2);
164 }
165
166 #define TS_SZ 188
167 #define TS_SYNC 0x47
168 #define TS_TEI 0x80
169 #define TS_SC 0xC0
170 #define TS_PUSI 0x40
171 #define TS_AF_A 0x20
172 #define TS_AF_D 0x10
173
174 /* ULE Extension Header handlers. */
175
176 #define ULE_TEST 0
177 #define ULE_BRIDGED 1
178
179 #define ULE_OPTEXTHDR_PADDING 0
180
ule_test_sndu(struct dvb_net_priv * p)181 static int ule_test_sndu( struct dvb_net_priv *p )
182 {
183 return -1;
184 }
185
ule_bridged_sndu(struct dvb_net_priv * p)186 static int ule_bridged_sndu( struct dvb_net_priv *p )
187 {
188 struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
189 if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
190 int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
191 /* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
192 if(framelen != ntohs(hdr->h_proto)) {
193 return -1;
194 }
195 }
196 /* Note:
197 * From RFC4326:
198 * "A bridged SNDU is a Mandatory Extension Header of Type 1.
199 * It must be the final (or only) extension header specified in the header chain of a SNDU."
200 * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
201 */
202 p->ule_bridged = 1;
203 return 0;
204 }
205
ule_exthdr_padding(struct dvb_net_priv * p)206 static int ule_exthdr_padding(struct dvb_net_priv *p)
207 {
208 return 0;
209 }
210
211 /*
212 * Handle ULE extension headers.
213 * Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
214 * Returns: >= 0: nr. of bytes consumed by next extension header
215 * -1: Mandatory extension header that is not recognized or TEST SNDU; discard.
216 */
handle_one_ule_extension(struct dvb_net_priv * p)217 static int handle_one_ule_extension( struct dvb_net_priv *p )
218 {
219 /* Table of mandatory extension header handlers. The header type is the index. */
220 static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
221 { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL, };
222
223 /* Table of optional extension header handlers. The header type is the index. */
224 static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
225 { [0] = ule_exthdr_padding, [1] = NULL, };
226
227 int ext_len = 0;
228 unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
229 unsigned char htype = p->ule_sndu_type & 0x00FF;
230
231 if (htype >= ARRAY_SIZE(ule_mandatory_ext_handlers))
232 return -1;
233
234 /* Discriminate mandatory and optional extension headers. */
235 if (hlen == 0) {
236 /* Mandatory extension header */
237 if (ule_mandatory_ext_handlers[htype]) {
238 ext_len = ule_mandatory_ext_handlers[htype]( p );
239 if(ext_len >= 0) {
240 p->ule_next_hdr += ext_len;
241 if (!p->ule_bridged) {
242 p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
243 p->ule_next_hdr += 2;
244 } else {
245 p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
246 /* This assures the extension handling loop will terminate. */
247 }
248 }
249 // else: extension handler failed or SNDU should be discarded
250 } else
251 ext_len = -1; /* SNDU has to be discarded. */
252 } else {
253 /* Optional extension header. Calculate the length. */
254 ext_len = hlen << 1;
255 /* Process the optional extension header according to its type. */
256 if (ule_optional_ext_handlers[htype])
257 (void)ule_optional_ext_handlers[htype]( p );
258 p->ule_next_hdr += ext_len;
259 p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
260 /*
261 * note: the length of the next header type is included in the
262 * length of THIS optional extension header
263 */
264 }
265
266 return ext_len;
267 }
268
handle_ule_extensions(struct dvb_net_priv * p)269 static int handle_ule_extensions( struct dvb_net_priv *p )
270 {
271 int total_ext_len = 0, l;
272
273 p->ule_next_hdr = p->ule_skb->data;
274 do {
275 l = handle_one_ule_extension( p );
276 if (l < 0)
277 return l; /* Stop extension header processing and discard SNDU. */
278 total_ext_len += l;
279 pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
280 p->ule_next_hdr, (int)p->ule_sndu_type,
281 l, total_ext_len);
282
283 } while (p->ule_sndu_type < ETH_P_802_3_MIN);
284
285 return total_ext_len;
286 }
287
288
289 /* Prepare for a new ULE SNDU: reset the decoder state. */
reset_ule(struct dvb_net_priv * p)290 static inline void reset_ule( struct dvb_net_priv *p )
291 {
292 p->ule_skb = NULL;
293 p->ule_next_hdr = NULL;
294 p->ule_sndu_len = 0;
295 p->ule_sndu_type = 0;
296 p->ule_sndu_type_1 = 0;
297 p->ule_sndu_remain = 0;
298 p->ule_dbit = 0xFF;
299 p->ule_bridged = 0;
300 }
301
302 /*
303 * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
304 * TS cells of a single PID.
305 */
306
307 struct dvb_net_ule_handle {
308 struct net_device *dev;
309 struct dvb_net_priv *priv;
310 struct ethhdr *ethh;
311 const u8 *buf;
312 size_t buf_len;
313 unsigned long skipped;
314 const u8 *ts, *ts_end, *from_where;
315 u8 ts_remain, how_much, new_ts;
316 bool error;
317 };
318
dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle * h)319 static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
320 {
321 /* We are about to process a new TS cell. */
322
323 #ifdef DVB_ULE_DEBUG
324 if (ule_where >= &ule_hist[100*TS_SZ])
325 ule_where = ule_hist;
326 memcpy(ule_where, h->ts, TS_SZ);
327 if (ule_dump) {
328 hexdump(ule_where, TS_SZ);
329 ule_dump = 0;
330 }
331 ule_where += TS_SZ;
332 #endif
333
334 /*
335 * Check TS h->error conditions: sync_byte, transport_error_indicator,
336 * scrambling_control .
337 */
338 if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
339 ((h->ts[3] & TS_SC) != 0)) {
340 pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
341 h->priv->ts_count, h->ts[0],
342 (h->ts[1] & TS_TEI) >> 7,
343 (h->ts[3] & TS_SC) >> 6);
344
345 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
346 if (h->priv->ule_skb) {
347 dev_kfree_skb(h->priv->ule_skb);
348 /* Prepare for next SNDU. */
349 h->dev->stats.rx_errors++;
350 h->dev->stats.rx_frame_errors++;
351 }
352 reset_ule(h->priv);
353 h->priv->need_pusi = 1;
354
355 /* Continue with next TS cell. */
356 h->ts += TS_SZ;
357 h->priv->ts_count++;
358 return 1;
359 }
360
361 h->ts_remain = 184;
362 h->from_where = h->ts + 4;
363
364 return 0;
365 }
366
dvb_net_ule_ts_pusi(struct dvb_net_ule_handle * h)367 static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
368 {
369 if (h->ts[1] & TS_PUSI) {
370 /* Find beginning of first ULE SNDU in current TS cell. */
371 /* Synchronize continuity counter. */
372 h->priv->tscc = h->ts[3] & 0x0F;
373 /* There is a pointer field here. */
374 if (h->ts[4] > h->ts_remain) {
375 pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
376 h->priv->ts_count, h->ts[4]);
377 h->ts += TS_SZ;
378 h->priv->ts_count++;
379 return 1;
380 }
381 /* Skip to destination of pointer field. */
382 h->from_where = &h->ts[5] + h->ts[4];
383 h->ts_remain -= 1 + h->ts[4];
384 h->skipped = 0;
385 } else {
386 h->skipped++;
387 h->ts += TS_SZ;
388 h->priv->ts_count++;
389 return 1;
390 }
391
392 return 0;
393 }
394
dvb_net_ule_new_ts(struct dvb_net_ule_handle * h)395 static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
396 {
397 /* Check continuity counter. */
398 if ((h->ts[3] & 0x0F) == h->priv->tscc)
399 h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
400 else {
401 /* TS discontinuity handling: */
402 pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
403 h->priv->ts_count, h->ts[3] & 0x0F,
404 h->priv->tscc);
405 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
406 if (h->priv->ule_skb) {
407 dev_kfree_skb(h->priv->ule_skb);
408 /* Prepare for next SNDU. */
409 // reset_ule(h->priv); moved to below.
410 h->dev->stats.rx_errors++;
411 h->dev->stats.rx_frame_errors++;
412 }
413 reset_ule(h->priv);
414 /* skip to next PUSI. */
415 h->priv->need_pusi = 1;
416 return 1;
417 }
418 /*
419 * If we still have an incomplete payload, but PUSI is
420 * set; some TS cells are missing.
421 * This is only possible here, if we missed exactly 16 TS
422 * cells (continuity counter wrap).
423 */
424 if (h->ts[1] & TS_PUSI) {
425 if (!h->priv->need_pusi) {
426 if (!(*h->from_where < (h->ts_remain-1)) ||
427 *h->from_where != h->priv->ule_sndu_remain) {
428 /*
429 * Pointer field is invalid.
430 * Drop this TS cell and any started ULE SNDU.
431 */
432 pr_warn("%lu: Invalid pointer field: %u.\n",
433 h->priv->ts_count,
434 *h->from_where);
435
436 /*
437 * Drop partly decoded SNDU, reset state,
438 * resync on PUSI.
439 */
440 if (h->priv->ule_skb) {
441 h->error = true;
442 dev_kfree_skb(h->priv->ule_skb);
443 }
444
445 if (h->error || h->priv->ule_sndu_remain) {
446 h->dev->stats.rx_errors++;
447 h->dev->stats.rx_frame_errors++;
448 h->error = false;
449 }
450
451 reset_ule(h->priv);
452 h->priv->need_pusi = 1;
453 return 1;
454 }
455 /*
456 * Skip pointer field (we're processing a
457 * packed payload).
458 */
459 h->from_where += 1;
460 h->ts_remain -= 1;
461 } else
462 h->priv->need_pusi = 0;
463
464 if (h->priv->ule_sndu_remain > 183) {
465 /*
466 * Current SNDU lacks more data than there
467 * could be available in the current TS cell.
468 */
469 h->dev->stats.rx_errors++;
470 h->dev->stats.rx_length_errors++;
471 pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d). Flushing incomplete payload.\n",
472 h->priv->ts_count,
473 h->priv->ule_sndu_remain,
474 h->ts[4], h->ts_remain);
475 dev_kfree_skb(h->priv->ule_skb);
476 /* Prepare for next SNDU. */
477 reset_ule(h->priv);
478 /*
479 * Resync: go to where pointer field points to:
480 * start of next ULE SNDU.
481 */
482 h->from_where += h->ts[4];
483 h->ts_remain -= h->ts[4];
484 }
485 }
486 return 0;
487 }
488
489
490 /*
491 * Start a new payload with skb.
492 * Find ULE header. It is only guaranteed that the
493 * length field (2 bytes) is contained in the current
494 * TS.
495 * Check h.ts_remain has to be >= 2 here.
496 */
dvb_net_ule_new_payload(struct dvb_net_ule_handle * h)497 static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
498 {
499 if (h->ts_remain < 2) {
500 pr_warn("Invalid payload packing: only %d bytes left in TS. Resyncing.\n",
501 h->ts_remain);
502 h->priv->ule_sndu_len = 0;
503 h->priv->need_pusi = 1;
504 h->ts += TS_SZ;
505 return 1;
506 }
507
508 if (!h->priv->ule_sndu_len) {
509 /* Got at least two bytes, thus extrace the SNDU length. */
510 h->priv->ule_sndu_len = h->from_where[0] << 8 |
511 h->from_where[1];
512 if (h->priv->ule_sndu_len & 0x8000) {
513 /* D-Bit is set: no dest mac present. */
514 h->priv->ule_sndu_len &= 0x7FFF;
515 h->priv->ule_dbit = 1;
516 } else
517 h->priv->ule_dbit = 0;
518
519 if (h->priv->ule_sndu_len < 5) {
520 pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
521 h->priv->ts_count,
522 h->priv->ule_sndu_len);
523 h->dev->stats.rx_errors++;
524 h->dev->stats.rx_length_errors++;
525 h->priv->ule_sndu_len = 0;
526 h->priv->need_pusi = 1;
527 h->new_ts = 1;
528 h->ts += TS_SZ;
529 h->priv->ts_count++;
530 return 1;
531 }
532 h->ts_remain -= 2; /* consume the 2 bytes SNDU length. */
533 h->from_where += 2;
534 }
535
536 h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
537 /*
538 * State of current TS:
539 * h->ts_remain (remaining bytes in the current TS cell)
540 * 0 ule_type is not available now, we need the next TS cell
541 * 1 the first byte of the ule_type is present
542 * >=2 full ULE header present, maybe some payload data as well.
543 */
544 switch (h->ts_remain) {
545 case 1:
546 h->priv->ule_sndu_remain--;
547 h->priv->ule_sndu_type = h->from_where[0] << 8;
548
549 /* first byte of ule_type is set. */
550 h->priv->ule_sndu_type_1 = 1;
551 h->ts_remain -= 1;
552 h->from_where += 1;
553 fallthrough;
554 case 0:
555 h->new_ts = 1;
556 h->ts += TS_SZ;
557 h->priv->ts_count++;
558 return 1;
559
560 default: /* complete ULE header is present in current TS. */
561 /* Extract ULE type field. */
562 if (h->priv->ule_sndu_type_1) {
563 h->priv->ule_sndu_type_1 = 0;
564 h->priv->ule_sndu_type |= h->from_where[0];
565 h->from_where += 1; /* points to payload start. */
566 h->ts_remain -= 1;
567 } else {
568 /* Complete type is present in new TS. */
569 h->priv->ule_sndu_type = h->from_where[0] << 8 |
570 h->from_where[1];
571 h->from_where += 2; /* points to payload start. */
572 h->ts_remain -= 2;
573 }
574 break;
575 }
576
577 /*
578 * Allocate the skb (decoder target buffer) with the correct size,
579 * as follows:
580 *
581 * prepare for the largest case: bridged SNDU with MAC address
582 * (dbit = 0).
583 */
584 h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
585 ETH_HLEN + ETH_ALEN);
586 if (!h->priv->ule_skb) {
587 pr_notice("%s: Memory squeeze, dropping packet.\n",
588 h->dev->name);
589 h->dev->stats.rx_dropped++;
590 return -1;
591 }
592
593 /* This includes the CRC32 _and_ dest mac, if !dbit. */
594 h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
595 h->priv->ule_skb->dev = h->dev;
596 /*
597 * Leave space for Ethernet or bridged SNDU header
598 * (eth hdr plus one MAC addr).
599 */
600 skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
601
602 return 0;
603 }
604
605
dvb_net_ule_should_drop(struct dvb_net_ule_handle * h)606 static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
607 {
608 static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
609
610 /*
611 * The destination MAC address is the next data in the skb. It comes
612 * before any extension headers.
613 *
614 * Check if the payload of this SNDU should be passed up the stack.
615 */
616 if (h->priv->rx_mode == RX_MODE_PROMISC)
617 return 0;
618
619 if (h->priv->ule_skb->data[0] & 0x01) {
620 /* multicast or broadcast */
621 if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
622 /* multicast */
623 if (h->priv->rx_mode == RX_MODE_MULTI) {
624 int i;
625
626 for (i = 0; i < h->priv->multi_num &&
627 !ether_addr_equal(h->priv->ule_skb->data,
628 h->priv->multi_macs[i]);
629 i++)
630 ;
631 if (i == h->priv->multi_num)
632 return 1;
633 } else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
634 return 1; /* no broadcast; */
635 /*
636 * else:
637 * all multicast mode: accept all multicast packets
638 */
639 }
640 /* else: broadcast */
641 } else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
642 return 1;
643
644 return 0;
645 }
646
647
dvb_net_ule_check_crc(struct dvb_net_ule_handle * h,struct kvec iov[3],u32 ule_crc,u32 expected_crc)648 static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
649 struct kvec iov[3],
650 u32 ule_crc, u32 expected_crc)
651 {
652 u8 dest_addr[ETH_ALEN];
653
654 if (ule_crc != expected_crc) {
655 pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
656 h->priv->ts_count, ule_crc, expected_crc,
657 h->priv->ule_sndu_len, h->priv->ule_sndu_type,
658 h->ts_remain,
659 h->ts_remain > 2 ?
660 *(unsigned short *)h->from_where : 0);
661
662 #ifdef DVB_ULE_DEBUG
663 hexdump(iov[0].iov_base, iov[0].iov_len);
664 hexdump(iov[1].iov_base, iov[1].iov_len);
665 hexdump(iov[2].iov_base, iov[2].iov_len);
666
667 if (ule_where == ule_hist) {
668 hexdump(&ule_hist[98*TS_SZ], TS_SZ);
669 hexdump(&ule_hist[99*TS_SZ], TS_SZ);
670 } else if (ule_where == &ule_hist[TS_SZ]) {
671 hexdump(&ule_hist[99*TS_SZ], TS_SZ);
672 hexdump(ule_hist, TS_SZ);
673 } else {
674 hexdump(ule_where - TS_SZ - TS_SZ, TS_SZ);
675 hexdump(ule_where - TS_SZ, TS_SZ);
676 }
677 ule_dump = 1;
678 #endif
679
680 h->dev->stats.rx_errors++;
681 h->dev->stats.rx_crc_errors++;
682 dev_kfree_skb(h->priv->ule_skb);
683
684 return;
685 }
686
687 /* CRC32 verified OK. */
688
689 /* CRC32 was OK, so remove it from skb. */
690 h->priv->ule_skb->tail -= 4;
691 h->priv->ule_skb->len -= 4;
692
693 if (!h->priv->ule_dbit) {
694 if (dvb_net_ule_should_drop(h)) {
695 netdev_dbg(h->dev,
696 "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
697 h->priv->ule_skb->data, h->dev->dev_addr);
698 dev_kfree_skb(h->priv->ule_skb);
699 return;
700 }
701
702 skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
703 ETH_ALEN);
704 skb_pull(h->priv->ule_skb, ETH_ALEN);
705 } else {
706 /* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
707 eth_zero_addr(dest_addr);
708 }
709
710 /* Handle ULE Extension Headers. */
711 if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
712 /* There is an extension header. Handle it accordingly. */
713 int l = handle_ule_extensions(h->priv);
714
715 if (l < 0) {
716 /*
717 * Mandatory extension header unknown or TEST SNDU.
718 * Drop it.
719 */
720
721 // pr_warn("Dropping SNDU, extension headers.\n" );
722 dev_kfree_skb(h->priv->ule_skb);
723 return;
724 }
725 skb_pull(h->priv->ule_skb, l);
726 }
727
728 /*
729 * Construct/assure correct ethernet header.
730 * Note: in bridged mode (h->priv->ule_bridged != 0)
731 * we already have the (original) ethernet
732 * header at the start of the payload (after
733 * optional dest. address and any extension
734 * headers).
735 */
736 if (!h->priv->ule_bridged) {
737 skb_push(h->priv->ule_skb, ETH_HLEN);
738 h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
739 memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
740 eth_zero_addr(h->ethh->h_source);
741 h->ethh->h_proto = htons(h->priv->ule_sndu_type);
742 }
743 /* else: skb is in correct state; nothing to do. */
744 h->priv->ule_bridged = 0;
745
746 /* Stuff into kernel's protocol stack. */
747 h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
748 h->dev);
749 /*
750 * If D-bit is set (i.e. destination MAC address not present),
751 * receive the packet anyhow.
752 */
753 #if 0
754 if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
755 h->priv->ule_skb->pkt_type = PACKET_HOST;
756 #endif
757 h->dev->stats.rx_packets++;
758 h->dev->stats.rx_bytes += h->priv->ule_skb->len;
759 netif_rx(h->priv->ule_skb);
760 }
761
dvb_net_ule(struct net_device * dev,const u8 * buf,size_t buf_len)762 static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
763 {
764 int ret;
765 struct dvb_net_ule_handle h = {
766 .dev = dev,
767 .priv = netdev_priv(dev),
768 .ethh = NULL,
769 .buf = buf,
770 .buf_len = buf_len,
771 .skipped = 0L,
772 .ts = NULL,
773 .ts_end = NULL,
774 .from_where = NULL,
775 .ts_remain = 0,
776 .how_much = 0,
777 .new_ts = 1,
778 .error = false,
779 };
780
781 /*
782 * For all TS cells in current buffer.
783 * Appearently, we are called for every single TS cell.
784 */
785 for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
786 h.ts < h.ts_end; /* no incr. */) {
787 if (h.new_ts) {
788 /* We are about to process a new TS cell. */
789 if (dvb_net_ule_new_ts_cell(&h))
790 continue;
791 }
792
793 /* Synchronize on PUSI, if required. */
794 if (h.priv->need_pusi) {
795 if (dvb_net_ule_ts_pusi(&h))
796 continue;
797 }
798
799 if (h.new_ts) {
800 if (dvb_net_ule_new_ts(&h))
801 continue;
802 }
803
804 /* Check if new payload needs to be started. */
805 if (h.priv->ule_skb == NULL) {
806 ret = dvb_net_ule_new_payload(&h);
807 if (ret < 0)
808 return;
809 if (ret)
810 continue;
811 }
812
813 /* Copy data into our current skb. */
814 h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
815 skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
816 h.priv->ule_sndu_remain -= h.how_much;
817 h.ts_remain -= h.how_much;
818 h.from_where += h.how_much;
819
820 /* Check for complete payload. */
821 if (h.priv->ule_sndu_remain <= 0) {
822 /* Check CRC32, we've got it in our skb already. */
823 __be16 ulen = htons(h.priv->ule_sndu_len);
824 __be16 utype = htons(h.priv->ule_sndu_type);
825 const u8 *tail;
826 struct kvec iov[3] = {
827 { &ulen, sizeof ulen },
828 { &utype, sizeof utype },
829 { h.priv->ule_skb->data,
830 h.priv->ule_skb->len - 4 }
831 };
832 u32 ule_crc = ~0L, expected_crc;
833 if (h.priv->ule_dbit) {
834 /* Set D-bit for CRC32 verification,
835 * if it was set originally. */
836 ulen |= htons(0x8000);
837 }
838
839 ule_crc = iov_crc32(ule_crc, iov, 3);
840 tail = skb_tail_pointer(h.priv->ule_skb);
841 expected_crc = *(tail - 4) << 24 |
842 *(tail - 3) << 16 |
843 *(tail - 2) << 8 |
844 *(tail - 1);
845
846 dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
847
848 /* Prepare for next SNDU. */
849 reset_ule(h.priv);
850 }
851
852 /* More data in current TS (look at the bytes following the CRC32)? */
853 if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
854 /* Next ULE SNDU starts right there. */
855 h.new_ts = 0;
856 h.priv->ule_skb = NULL;
857 h.priv->ule_sndu_type_1 = 0;
858 h.priv->ule_sndu_len = 0;
859 // pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
860 // *(h.from_where + 0), *(h.from_where + 1),
861 // *(h.from_where + 2), *(h.from_where + 3));
862 // pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
863 // hexdump(h.ts, 188);
864 } else {
865 h.new_ts = 1;
866 h.ts += TS_SZ;
867 h.priv->ts_count++;
868 if (h.priv->ule_skb == NULL) {
869 h.priv->need_pusi = 1;
870 h.priv->ule_sndu_type_1 = 0;
871 h.priv->ule_sndu_len = 0;
872 }
873 }
874 } /* for all available TS cells */
875 }
876
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)877 static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
878 const u8 *buffer2, size_t buffer2_len,
879 struct dmx_ts_feed *feed,
880 u32 *buffer_flags)
881 {
882 struct net_device *dev = feed->priv;
883
884 if (buffer2)
885 pr_warn("buffer2 not NULL: %p.\n", buffer2);
886 if (buffer1_len > 32768)
887 pr_warn("length > 32k: %zu.\n", buffer1_len);
888 /* pr_info("TS callback: %u bytes, %u TS cells @ %p.\n",
889 buffer1_len, buffer1_len / TS_SZ, buffer1); */
890 dvb_net_ule(dev, buffer1, buffer1_len);
891 return 0;
892 }
893
894
dvb_net_sec(struct net_device * dev,const u8 * pkt,int pkt_len)895 static void dvb_net_sec(struct net_device *dev,
896 const u8 *pkt, int pkt_len)
897 {
898 u8 *eth;
899 struct sk_buff *skb;
900 struct net_device_stats *stats = &dev->stats;
901 int snap = 0;
902
903 /* note: pkt_len includes a 32bit checksum */
904 if (pkt_len < 16) {
905 pr_warn("%s: IP/MPE packet length = %d too small.\n",
906 dev->name, pkt_len);
907 stats->rx_errors++;
908 stats->rx_length_errors++;
909 return;
910 }
911 /* it seems some ISPs manage to screw up here, so we have to
912 * relax the error checks... */
913 #if 0
914 if ((pkt[5] & 0xfd) != 0xc1) {
915 /* drop scrambled or broken packets */
916 #else
917 if ((pkt[5] & 0x3c) != 0x00) {
918 /* drop scrambled */
919 #endif
920 stats->rx_errors++;
921 stats->rx_crc_errors++;
922 return;
923 }
924 if (pkt[5] & 0x02) {
925 /* handle LLC/SNAP, see rfc-1042 */
926 if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
927 stats->rx_dropped++;
928 return;
929 }
930 snap = 8;
931 }
932 if (pkt[7]) {
933 /* FIXME: assemble datagram from multiple sections */
934 stats->rx_errors++;
935 stats->rx_frame_errors++;
936 return;
937 }
938
939 /* we have 14 byte ethernet header (ip header follows);
940 * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
941 */
942 if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
943 //pr_notice("%s: Memory squeeze, dropping packet.\n", dev->name);
944 stats->rx_dropped++;
945 return;
946 }
947 skb_reserve(skb, 2); /* longword align L3 header */
948 skb->dev = dev;
949
950 /* copy L3 payload */
951 eth = skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
952 memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
953
954 /* create ethernet header: */
955 eth[0]=pkt[0x0b];
956 eth[1]=pkt[0x0a];
957 eth[2]=pkt[0x09];
958 eth[3]=pkt[0x08];
959 eth[4]=pkt[0x04];
960 eth[5]=pkt[0x03];
961
962 eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
963
964 if (snap) {
965 eth[12] = pkt[18];
966 eth[13] = pkt[19];
967 } else {
968 /* protocol numbers are from rfc-1700 or
969 * http://www.iana.org/assignments/ethernet-numbers
970 */
971 if (pkt[12] >> 4 == 6) { /* version field from IP header */
972 eth[12] = 0x86; /* IPv6 */
973 eth[13] = 0xdd;
974 } else {
975 eth[12] = 0x08; /* IPv4 */
976 eth[13] = 0x00;
977 }
978 }
979
980 skb->protocol = dvb_net_eth_type_trans(skb, dev);
981
982 stats->rx_packets++;
983 stats->rx_bytes+=skb->len;
984 netif_rx(skb);
985 }
986
987 static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
988 const u8 *buffer2, size_t buffer2_len,
989 struct dmx_section_filter *filter, u32 *buffer_flags)
990 {
991 struct net_device *dev = filter->priv;
992
993 /*
994 * we rely on the DVB API definition where exactly one complete
995 * section is delivered in buffer1
996 */
997 dvb_net_sec (dev, buffer1, buffer1_len);
998 return 0;
999 }
1000
1001 static netdev_tx_t dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
1002 {
1003 dev_kfree_skb(skb);
1004 return NETDEV_TX_OK;
1005 }
1006
1007 static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1008 static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
1009 static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
1010 static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1011
1012 static int dvb_net_filter_sec_set(struct net_device *dev,
1013 struct dmx_section_filter **secfilter,
1014 const u8 *mac, u8 *mac_mask)
1015 {
1016 struct dvb_net_priv *priv = netdev_priv(dev);
1017 int ret;
1018
1019 *secfilter=NULL;
1020 ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
1021 if (ret<0) {
1022 pr_err("%s: could not get filter\n", dev->name);
1023 return ret;
1024 }
1025
1026 (*secfilter)->priv=(void *) dev;
1027
1028 memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
1029 memset((*secfilter)->filter_mask, 0x00, DMX_MAX_FILTER_SIZE);
1030 memset((*secfilter)->filter_mode, 0xff, DMX_MAX_FILTER_SIZE);
1031
1032 (*secfilter)->filter_value[0]=0x3e;
1033 (*secfilter)->filter_value[3]=mac[5];
1034 (*secfilter)->filter_value[4]=mac[4];
1035 (*secfilter)->filter_value[8]=mac[3];
1036 (*secfilter)->filter_value[9]=mac[2];
1037 (*secfilter)->filter_value[10]=mac[1];
1038 (*secfilter)->filter_value[11]=mac[0];
1039
1040 (*secfilter)->filter_mask[0] = 0xff;
1041 (*secfilter)->filter_mask[3] = mac_mask[5];
1042 (*secfilter)->filter_mask[4] = mac_mask[4];
1043 (*secfilter)->filter_mask[8] = mac_mask[3];
1044 (*secfilter)->filter_mask[9] = mac_mask[2];
1045 (*secfilter)->filter_mask[10] = mac_mask[1];
1046 (*secfilter)->filter_mask[11]=mac_mask[0];
1047
1048 netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
1049
1050 return 0;
1051 }
1052
1053 static int dvb_net_feed_start(struct net_device *dev)
1054 {
1055 int ret = 0, i;
1056 struct dvb_net_priv *priv = netdev_priv(dev);
1057 struct dmx_demux *demux = priv->demux;
1058 const unsigned char *mac = (const unsigned char *) dev->dev_addr;
1059
1060 netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
1061 mutex_lock(&priv->mutex);
1062 if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
1063 pr_err("%s: BUG %d\n", __func__, __LINE__);
1064
1065 priv->secfeed=NULL;
1066 priv->secfilter=NULL;
1067 priv->tsfeed = NULL;
1068
1069 if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1070 netdev_dbg(dev, "alloc secfeed\n");
1071 ret=demux->allocate_section_feed(demux, &priv->secfeed,
1072 dvb_net_sec_callback);
1073 if (ret<0) {
1074 pr_err("%s: could not allocate section feed\n",
1075 dev->name);
1076 goto error;
1077 }
1078
1079 ret = priv->secfeed->set(priv->secfeed, priv->pid, 1);
1080
1081 if (ret<0) {
1082 pr_err("%s: could not set section feed\n", dev->name);
1083 priv->demux->release_section_feed(priv->demux, priv->secfeed);
1084 priv->secfeed=NULL;
1085 goto error;
1086 }
1087
1088 if (priv->rx_mode != RX_MODE_PROMISC) {
1089 netdev_dbg(dev, "set secfilter\n");
1090 dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
1091 }
1092
1093 switch (priv->rx_mode) {
1094 case RX_MODE_MULTI:
1095 for (i = 0; i < priv->multi_num; i++) {
1096 netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
1097 dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
1098 priv->multi_macs[i], mask_normal);
1099 }
1100 break;
1101 case RX_MODE_ALL_MULTI:
1102 priv->multi_num=1;
1103 netdev_dbg(dev, "set multi_secfilter[0]\n");
1104 dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
1105 mac_allmulti, mask_allmulti);
1106 break;
1107 case RX_MODE_PROMISC:
1108 priv->multi_num=0;
1109 netdev_dbg(dev, "set secfilter\n");
1110 dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
1111 break;
1112 }
1113
1114 netdev_dbg(dev, "start filtering\n");
1115 priv->secfeed->start_filtering(priv->secfeed);
1116 } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1117 ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
1118
1119 /* we have payloads encapsulated in TS */
1120 netdev_dbg(dev, "alloc tsfeed\n");
1121 ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1122 if (ret < 0) {
1123 pr_err("%s: could not allocate ts feed\n", dev->name);
1124 goto error;
1125 }
1126
1127 /* Set netdevice pointer for ts decaps callback. */
1128 priv->tsfeed->priv = (void *)dev;
1129 ret = priv->tsfeed->set(priv->tsfeed,
1130 priv->pid, /* pid */
1131 TS_PACKET, /* type */
1132 DMX_PES_OTHER, /* pes type */
1133 timeout /* timeout */
1134 );
1135
1136 if (ret < 0) {
1137 pr_err("%s: could not set ts feed\n", dev->name);
1138 priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1139 priv->tsfeed = NULL;
1140 goto error;
1141 }
1142
1143 netdev_dbg(dev, "start filtering\n");
1144 priv->tsfeed->start_filtering(priv->tsfeed);
1145 } else
1146 ret = -EINVAL;
1147
1148 error:
1149 mutex_unlock(&priv->mutex);
1150 return ret;
1151 }
1152
1153 static int dvb_net_feed_stop(struct net_device *dev)
1154 {
1155 struct dvb_net_priv *priv = netdev_priv(dev);
1156 int i, ret = 0;
1157
1158 mutex_lock(&priv->mutex);
1159 if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1160 if (priv->secfeed) {
1161 if (priv->secfeed->is_filtering) {
1162 netdev_dbg(dev, "stop secfeed\n");
1163 priv->secfeed->stop_filtering(priv->secfeed);
1164 }
1165
1166 if (priv->secfilter) {
1167 netdev_dbg(dev, "release secfilter\n");
1168 priv->secfeed->release_filter(priv->secfeed,
1169 priv->secfilter);
1170 priv->secfilter=NULL;
1171 }
1172
1173 for (i=0; i<priv->multi_num; i++) {
1174 if (priv->multi_secfilter[i]) {
1175 netdev_dbg(dev, "release multi_filter[%d]\n",
1176 i);
1177 priv->secfeed->release_filter(priv->secfeed,
1178 priv->multi_secfilter[i]);
1179 priv->multi_secfilter[i] = NULL;
1180 }
1181 }
1182
1183 priv->demux->release_section_feed(priv->demux, priv->secfeed);
1184 priv->secfeed = NULL;
1185 } else
1186 pr_err("%s: no feed to stop\n", dev->name);
1187 } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1188 if (priv->tsfeed) {
1189 if (priv->tsfeed->is_filtering) {
1190 netdev_dbg(dev, "stop tsfeed\n");
1191 priv->tsfeed->stop_filtering(priv->tsfeed);
1192 }
1193 priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1194 priv->tsfeed = NULL;
1195 }
1196 else
1197 pr_err("%s: no ts feed to stop\n", dev->name);
1198 } else
1199 ret = -EINVAL;
1200 mutex_unlock(&priv->mutex);
1201 return ret;
1202 }
1203
1204
1205 static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1206 {
1207 struct dvb_net_priv *priv = netdev_priv(dev);
1208
1209 if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1210 return -ENOMEM;
1211
1212 memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1213
1214 priv->multi_num++;
1215 return 0;
1216 }
1217
1218
1219 static void wq_set_multicast_list (struct work_struct *work)
1220 {
1221 struct dvb_net_priv *priv =
1222 container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1223 struct net_device *dev = priv->net;
1224
1225 dvb_net_feed_stop(dev);
1226 priv->rx_mode = RX_MODE_UNI;
1227 netif_addr_lock_bh(dev);
1228
1229 if (dev->flags & IFF_PROMISC) {
1230 netdev_dbg(dev, "promiscuous mode\n");
1231 priv->rx_mode = RX_MODE_PROMISC;
1232 } else if ((dev->flags & IFF_ALLMULTI)) {
1233 netdev_dbg(dev, "allmulti mode\n");
1234 priv->rx_mode = RX_MODE_ALL_MULTI;
1235 } else if (!netdev_mc_empty(dev)) {
1236 struct netdev_hw_addr *ha;
1237
1238 netdev_dbg(dev, "set_mc_list, %d entries\n",
1239 netdev_mc_count(dev));
1240
1241 priv->rx_mode = RX_MODE_MULTI;
1242 priv->multi_num = 0;
1243
1244 netdev_for_each_mc_addr(ha, dev)
1245 dvb_set_mc_filter(dev, ha->addr);
1246 }
1247
1248 netif_addr_unlock_bh(dev);
1249 dvb_net_feed_start(dev);
1250 }
1251
1252
1253 static void dvb_net_set_multicast_list (struct net_device *dev)
1254 {
1255 struct dvb_net_priv *priv = netdev_priv(dev);
1256 schedule_work(&priv->set_multicast_list_wq);
1257 }
1258
1259
1260 static void wq_restart_net_feed (struct work_struct *work)
1261 {
1262 struct dvb_net_priv *priv =
1263 container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1264 struct net_device *dev = priv->net;
1265
1266 if (netif_running(dev)) {
1267 dvb_net_feed_stop(dev);
1268 dvb_net_feed_start(dev);
1269 }
1270 }
1271
1272
1273 static int dvb_net_set_mac (struct net_device *dev, void *p)
1274 {
1275 struct dvb_net_priv *priv = netdev_priv(dev);
1276 struct sockaddr *addr=p;
1277
1278 eth_hw_addr_set(dev, addr->sa_data);
1279
1280 if (netif_running(dev))
1281 schedule_work(&priv->restart_net_feed_wq);
1282
1283 return 0;
1284 }
1285
1286
1287 static int dvb_net_open(struct net_device *dev)
1288 {
1289 struct dvb_net_priv *priv = netdev_priv(dev);
1290
1291 priv->in_use++;
1292 dvb_net_feed_start(dev);
1293 return 0;
1294 }
1295
1296
1297 static int dvb_net_stop(struct net_device *dev)
1298 {
1299 struct dvb_net_priv *priv = netdev_priv(dev);
1300
1301 priv->in_use--;
1302 return dvb_net_feed_stop(dev);
1303 }
1304
1305 static const struct header_ops dvb_header_ops = {
1306 .create = eth_header,
1307 .parse = eth_header_parse,
1308 };
1309
1310
1311 static const struct net_device_ops dvb_netdev_ops = {
1312 .ndo_open = dvb_net_open,
1313 .ndo_stop = dvb_net_stop,
1314 .ndo_start_xmit = dvb_net_tx,
1315 .ndo_set_rx_mode = dvb_net_set_multicast_list,
1316 .ndo_set_mac_address = dvb_net_set_mac,
1317 .ndo_validate_addr = eth_validate_addr,
1318 };
1319
1320 static void dvb_net_setup(struct net_device *dev)
1321 {
1322 ether_setup(dev);
1323
1324 dev->header_ops = &dvb_header_ops;
1325 dev->netdev_ops = &dvb_netdev_ops;
1326 dev->mtu = 4096;
1327 dev->max_mtu = 4096;
1328
1329 dev->flags |= IFF_NOARP;
1330 }
1331
1332 static int get_if(struct dvb_net *dvbnet)
1333 {
1334 int i;
1335
1336 for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1337 if (!dvbnet->state[i])
1338 break;
1339
1340 if (i == DVB_NET_DEVICES_MAX)
1341 return -1;
1342
1343 dvbnet->state[i]=1;
1344 return i;
1345 }
1346
1347 static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1348 {
1349 struct net_device *net;
1350 struct dvb_net_priv *priv;
1351 int result;
1352 int if_num;
1353
1354 if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1355 return -EINVAL;
1356 if ((if_num = get_if(dvbnet)) < 0)
1357 return -EINVAL;
1358
1359 net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1360 NET_NAME_UNKNOWN, dvb_net_setup);
1361 if (!net)
1362 return -ENOMEM;
1363
1364 if (dvbnet->dvbdev->id)
1365 snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1366 dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1367 else
1368 /* compatibility fix to keep dvb0_0 format */
1369 snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1370 dvbnet->dvbdev->adapter->num, if_num);
1371
1372 net->addr_len = 6;
1373 eth_hw_addr_set(net, dvbnet->dvbdev->adapter->proposed_mac);
1374
1375 dvbnet->device[if_num] = net;
1376
1377 priv = netdev_priv(net);
1378 priv->net = net;
1379 priv->demux = dvbnet->demux;
1380 priv->pid = pid;
1381 priv->rx_mode = RX_MODE_UNI;
1382 priv->need_pusi = 1;
1383 priv->tscc = 0;
1384 priv->feedtype = feedtype;
1385 reset_ule(priv);
1386
1387 INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1388 INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1389 mutex_init(&priv->mutex);
1390
1391 net->base_addr = pid;
1392
1393 if ((result = register_netdev(net)) < 0) {
1394 dvbnet->device[if_num] = NULL;
1395 free_netdev(net);
1396 return result;
1397 }
1398 pr_info("created network interface %s\n", net->name);
1399
1400 return if_num;
1401 }
1402
1403 static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1404 {
1405 struct net_device *net = dvbnet->device[num];
1406 struct dvb_net_priv *priv;
1407
1408 if (!dvbnet->state[num])
1409 return -EINVAL;
1410 priv = netdev_priv(net);
1411 if (priv->in_use)
1412 return -EBUSY;
1413
1414 dvb_net_stop(net);
1415 flush_work(&priv->set_multicast_list_wq);
1416 flush_work(&priv->restart_net_feed_wq);
1417 pr_info("removed network interface %s\n", net->name);
1418 unregister_netdev(net);
1419 dvbnet->state[num]=0;
1420 dvbnet->device[num] = NULL;
1421 free_netdev(net);
1422
1423 return 0;
1424 }
1425
1426 static int dvb_net_do_ioctl(struct file *file,
1427 unsigned int cmd, void *parg)
1428 {
1429 struct dvb_device *dvbdev = file->private_data;
1430 struct dvb_net *dvbnet = dvbdev->priv;
1431 int ret = 0;
1432
1433 if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1434 return -EPERM;
1435
1436 if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1437 return -ERESTARTSYS;
1438
1439 switch (cmd) {
1440 case NET_ADD_IF:
1441 {
1442 struct dvb_net_if *dvbnetif = parg;
1443 int result;
1444
1445 if (!capable(CAP_SYS_ADMIN)) {
1446 ret = -EPERM;
1447 goto ioctl_error;
1448 }
1449
1450 if (!try_module_get(dvbdev->adapter->module)) {
1451 ret = -EPERM;
1452 goto ioctl_error;
1453 }
1454
1455 result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1456 if (result<0) {
1457 module_put(dvbdev->adapter->module);
1458 ret = result;
1459 goto ioctl_error;
1460 }
1461 dvbnetif->if_num=result;
1462 break;
1463 }
1464 case NET_GET_IF:
1465 {
1466 struct net_device *netdev;
1467 struct dvb_net_priv *priv_data;
1468 struct dvb_net_if *dvbnetif = parg;
1469 int if_num = dvbnetif->if_num;
1470
1471 if (if_num >= DVB_NET_DEVICES_MAX) {
1472 ret = -EINVAL;
1473 goto ioctl_error;
1474 }
1475 if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1476
1477 if (!dvbnet->state[if_num]) {
1478 ret = -EINVAL;
1479 goto ioctl_error;
1480 }
1481
1482 netdev = dvbnet->device[if_num];
1483
1484 priv_data = netdev_priv(netdev);
1485 dvbnetif->pid=priv_data->pid;
1486 dvbnetif->feedtype=priv_data->feedtype;
1487 break;
1488 }
1489 case NET_REMOVE_IF:
1490 {
1491 if (!capable(CAP_SYS_ADMIN)) {
1492 ret = -EPERM;
1493 goto ioctl_error;
1494 }
1495 if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1496 ret = -EINVAL;
1497 goto ioctl_error;
1498 }
1499 ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1500 if (!ret)
1501 module_put(dvbdev->adapter->module);
1502 break;
1503 }
1504
1505 /* binary compatibility cruft */
1506 case __NET_ADD_IF_OLD:
1507 {
1508 struct __dvb_net_if_old *dvbnetif = parg;
1509 int result;
1510
1511 if (!capable(CAP_SYS_ADMIN)) {
1512 ret = -EPERM;
1513 goto ioctl_error;
1514 }
1515
1516 if (!try_module_get(dvbdev->adapter->module)) {
1517 ret = -EPERM;
1518 goto ioctl_error;
1519 }
1520
1521 result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1522 if (result<0) {
1523 module_put(dvbdev->adapter->module);
1524 ret = result;
1525 goto ioctl_error;
1526 }
1527 dvbnetif->if_num=result;
1528 break;
1529 }
1530 case __NET_GET_IF_OLD:
1531 {
1532 struct net_device *netdev;
1533 struct dvb_net_priv *priv_data;
1534 struct __dvb_net_if_old *dvbnetif = parg;
1535 int if_num = dvbnetif->if_num;
1536
1537 if (if_num >= DVB_NET_DEVICES_MAX) {
1538 ret = -EINVAL;
1539 goto ioctl_error;
1540 }
1541 if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1542
1543 if (!dvbnet->state[if_num]) {
1544 ret = -EINVAL;
1545 goto ioctl_error;
1546 }
1547
1548 netdev = dvbnet->device[if_num];
1549
1550 priv_data = netdev_priv(netdev);
1551 dvbnetif->pid=priv_data->pid;
1552 break;
1553 }
1554 default:
1555 ret = -ENOTTY;
1556 break;
1557 }
1558
1559 ioctl_error:
1560 mutex_unlock(&dvbnet->ioctl_mutex);
1561 return ret;
1562 }
1563
1564 static long dvb_net_ioctl(struct file *file,
1565 unsigned int cmd, unsigned long arg)
1566 {
1567 return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1568 }
1569
1570 static int locked_dvb_net_open(struct inode *inode, struct file *file)
1571 {
1572 struct dvb_device *dvbdev = file->private_data;
1573 struct dvb_net *dvbnet = dvbdev->priv;
1574 int ret;
1575
1576 if (mutex_lock_interruptible(&dvbnet->remove_mutex))
1577 return -ERESTARTSYS;
1578
1579 if (dvbnet->exit) {
1580 mutex_unlock(&dvbnet->remove_mutex);
1581 return -ENODEV;
1582 }
1583
1584 ret = dvb_generic_open(inode, file);
1585
1586 mutex_unlock(&dvbnet->remove_mutex);
1587
1588 return ret;
1589 }
1590
1591 static int dvb_net_close(struct inode *inode, struct file *file)
1592 {
1593 struct dvb_device *dvbdev = file->private_data;
1594 struct dvb_net *dvbnet = dvbdev->priv;
1595
1596 mutex_lock(&dvbnet->remove_mutex);
1597
1598 dvb_generic_release(inode, file);
1599
1600 if (dvbdev->users == 1 && dvbnet->exit == 1) {
1601 mutex_unlock(&dvbnet->remove_mutex);
1602 wake_up(&dvbdev->wait_queue);
1603 } else {
1604 mutex_unlock(&dvbnet->remove_mutex);
1605 }
1606
1607 return 0;
1608 }
1609
1610
1611 static const struct file_operations dvb_net_fops = {
1612 .owner = THIS_MODULE,
1613 .unlocked_ioctl = dvb_net_ioctl,
1614 .open = locked_dvb_net_open,
1615 .release = dvb_net_close,
1616 .llseek = noop_llseek,
1617 };
1618
1619 static const struct dvb_device dvbdev_net = {
1620 .priv = NULL,
1621 .users = 1,
1622 .writers = 1,
1623 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1624 .name = "dvb-net",
1625 #endif
1626 .fops = &dvb_net_fops,
1627 };
1628
1629 void dvb_net_release (struct dvb_net *dvbnet)
1630 {
1631 int i;
1632
1633 mutex_lock(&dvbnet->remove_mutex);
1634 dvbnet->exit = 1;
1635 mutex_unlock(&dvbnet->remove_mutex);
1636
1637 if (dvbnet->dvbdev->users < 1)
1638 wait_event(dvbnet->dvbdev->wait_queue,
1639 dvbnet->dvbdev->users == 1);
1640
1641 dvb_unregister_device(dvbnet->dvbdev);
1642
1643 for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1644 if (!dvbnet->state[i])
1645 continue;
1646 dvb_net_remove_if(dvbnet, i);
1647 }
1648 }
1649 EXPORT_SYMBOL(dvb_net_release);
1650
1651
1652 int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1653 struct dmx_demux *dmx)
1654 {
1655 int i;
1656
1657 mutex_init(&dvbnet->ioctl_mutex);
1658 mutex_init(&dvbnet->remove_mutex);
1659 dvbnet->demux = dmx;
1660
1661 for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1662 dvbnet->state[i] = 0;
1663
1664 return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1665 dvbnet, DVB_DEVICE_NET, 0);
1666 }
1667 EXPORT_SYMBOL(dvb_net_init);
1668