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