1 /* 2 * dvb_demux.c - DVB kernel demux API 3 * 4 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de> 5 * & Marcus Metzler <marcus@convergence.de> 6 * for convergence integrated media GmbH 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU Lesser General Public License 10 * as published by the Free Software Foundation; either version 2.1 11 * of the License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 */ 19 20 #define pr_fmt(fmt) "dvb_demux: " fmt 21 22 #include <linux/sched/signal.h> 23 #include <linux/spinlock.h> 24 #include <linux/slab.h> 25 #include <linux/vmalloc.h> 26 #include <linux/module.h> 27 #include <linux/poll.h> 28 #include <linux/string.h> 29 #include <linux/crc32.h> 30 #include <linux/uaccess.h> 31 #include <asm/div64.h> 32 33 #include <media/dvb_demux.h> 34 35 static int dvb_demux_tscheck; 36 module_param(dvb_demux_tscheck, int, 0644); 37 MODULE_PARM_DESC(dvb_demux_tscheck, 38 "enable transport stream continuity and TEI check"); 39 40 static int dvb_demux_speedcheck; 41 module_param(dvb_demux_speedcheck, int, 0644); 42 MODULE_PARM_DESC(dvb_demux_speedcheck, 43 "enable transport stream speed check"); 44 45 static int dvb_demux_feed_err_pkts = 1; 46 module_param(dvb_demux_feed_err_pkts, int, 0644); 47 MODULE_PARM_DESC(dvb_demux_feed_err_pkts, 48 "when set to 0, drop packets with the TEI bit set (1 by default)"); 49 50 #define dprintk(fmt, arg...) \ 51 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg) 52 53 #define dprintk_tscheck(x...) do { \ 54 if (dvb_demux_tscheck && printk_ratelimit()) \ 55 dprintk(x); \ 56 } while (0) 57 58 #ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG 59 # define dprintk_sect_loss(x...) dprintk(x) 60 #else 61 # define dprintk_sect_loss(x...) 62 #endif 63 64 #define set_buf_flags(__feed, __flag) \ 65 do { \ 66 (__feed)->buffer_flags |= (__flag); \ 67 } while (0) 68 69 /****************************************************************************** 70 * static inlined helper functions 71 ******************************************************************************/ 72 73 static inline u16 section_length(const u8 *buf) 74 { 75 return 3 + ((buf[1] & 0x0f) << 8) + buf[2]; 76 } 77 78 static inline u16 ts_pid(const u8 *buf) 79 { 80 return ((buf[1] & 0x1f) << 8) + buf[2]; 81 } 82 83 static inline u8 payload(const u8 *tsp) 84 { 85 if (!(tsp[3] & 0x10)) // no payload? 86 return 0; 87 88 if (tsp[3] & 0x20) { // adaptation field? 89 if (tsp[4] > 183) // corrupted data? 90 return 0; 91 else 92 return 184 - 1 - tsp[4]; 93 } 94 95 return 184; 96 } 97 98 static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len) 99 { 100 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len)); 101 } 102 103 static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s, 104 size_t len) 105 { 106 memcpy(d, s, len); 107 } 108 109 /****************************************************************************** 110 * Software filter functions 111 ******************************************************************************/ 112 113 static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed, 114 const u8 *buf) 115 { 116 int count = payload(buf); 117 int p; 118 int ccok; 119 u8 cc; 120 121 if (count == 0) 122 return -1; 123 124 p = 188 - count; 125 126 cc = buf[3] & 0x0f; 127 ccok = ((feed->cc + 1) & 0x0f) == cc; 128 feed->cc = cc; 129 if (!ccok) { 130 set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); 131 dprintk_sect_loss("missed packet: %d instead of %d!\n", 132 cc, (feed->cc + 1) & 0x0f); 133 } 134 135 if (buf[1] & 0x40) // PUSI ? 136 feed->peslen = 0xfffa; 137 138 feed->peslen += count; 139 140 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts, 141 &feed->buffer_flags); 142 } 143 144 static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed, 145 struct dvb_demux_filter *f) 146 { 147 u8 neq = 0; 148 int i; 149 150 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 151 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i]; 152 153 if (f->maskandmode[i] & xor) 154 return 0; 155 156 neq |= f->maskandnotmode[i] & xor; 157 } 158 159 if (f->doneq && !neq) 160 return 0; 161 162 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen, 163 NULL, 0, &f->filter, &feed->buffer_flags); 164 } 165 166 static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed) 167 { 168 struct dvb_demux *demux = feed->demux; 169 struct dvb_demux_filter *f = feed->filter; 170 struct dmx_section_feed *sec = &feed->feed.sec; 171 int section_syntax_indicator; 172 173 if (!sec->is_filtering) 174 return 0; 175 176 if (!f) 177 return 0; 178 179 if (sec->check_crc) { 180 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0); 181 if (section_syntax_indicator && 182 demux->check_crc32(feed, sec->secbuf, sec->seclen)) { 183 set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD); 184 return -1; 185 } 186 } 187 188 do { 189 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0) 190 return -1; 191 } while ((f = f->next) && sec->is_filtering); 192 193 sec->seclen = 0; 194 195 return 0; 196 } 197 198 static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed) 199 { 200 struct dmx_section_feed *sec = &feed->feed.sec; 201 202 if (sec->secbufp < sec->tsfeedp) { 203 int n = sec->tsfeedp - sec->secbufp; 204 205 /* 206 * Section padding is done with 0xff bytes entirely. 207 * Due to speed reasons, we won't check all of them 208 * but just first and last. 209 */ 210 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) { 211 set_buf_flags(feed, 212 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); 213 dprintk_sect_loss("section ts padding loss: %d/%d\n", 214 n, sec->tsfeedp); 215 dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf); 216 } 217 } 218 219 sec->tsfeedp = sec->secbufp = sec->seclen = 0; 220 sec->secbuf = sec->secbuf_base; 221 } 222 223 /* 224 * Losless Section Demux 1.4.1 by Emard 225 * Valsecchi Patrick: 226 * - middle of section A (no PUSI) 227 * - end of section A and start of section B 228 * (with PUSI pointing to the start of the second section) 229 * 230 * In this case, without feed->pusi_seen you'll receive a garbage section 231 * consisting of the end of section A. Basically because tsfeedp 232 * is incemented and the use=0 condition is not raised 233 * when the second packet arrives. 234 * 235 * Fix: 236 * when demux is started, let feed->pusi_seen = false to 237 * prevent initial feeding of garbage from the end of 238 * previous section. When you for the first time see PUSI=1 239 * then set feed->pusi_seen = true 240 */ 241 static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed, 242 const u8 *buf, u8 len) 243 { 244 struct dvb_demux *demux = feed->demux; 245 struct dmx_section_feed *sec = &feed->feed.sec; 246 u16 limit, seclen, n; 247 248 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE) 249 return 0; 250 251 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) { 252 set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); 253 dprintk_sect_loss("section buffer full loss: %d/%d\n", 254 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE, 255 DMX_MAX_SECFEED_SIZE); 256 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp; 257 } 258 259 if (len <= 0) 260 return 0; 261 262 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len); 263 sec->tsfeedp += len; 264 265 /* 266 * Dump all the sections we can find in the data (Emard) 267 */ 268 limit = sec->tsfeedp; 269 if (limit > DMX_MAX_SECFEED_SIZE) 270 return -1; /* internal error should never happen */ 271 272 /* to be sure always set secbuf */ 273 sec->secbuf = sec->secbuf_base + sec->secbufp; 274 275 for (n = 0; sec->secbufp + 2 < limit; n++) { 276 seclen = section_length(sec->secbuf); 277 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE 278 || seclen + sec->secbufp > limit) 279 return 0; 280 sec->seclen = seclen; 281 sec->crc_val = ~0; 282 /* dump [secbuf .. secbuf+seclen) */ 283 if (feed->pusi_seen) { 284 dvb_dmx_swfilter_section_feed(feed); 285 } else { 286 set_buf_flags(feed, 287 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); 288 dprintk_sect_loss("pusi not seen, discarding section data\n"); 289 } 290 sec->secbufp += seclen; /* secbufp and secbuf moving together is */ 291 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */ 292 } 293 294 return 0; 295 } 296 297 static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed, 298 const u8 *buf) 299 { 300 u8 p, count; 301 int ccok, dc_i = 0; 302 u8 cc; 303 304 count = payload(buf); 305 306 if (count == 0) /* count == 0 if no payload or out of range */ 307 return -1; 308 309 p = 188 - count; /* payload start */ 310 311 cc = buf[3] & 0x0f; 312 ccok = ((feed->cc + 1) & 0x0f) == cc; 313 feed->cc = cc; 314 315 if (buf[3] & 0x20) { 316 /* adaption field present, check for discontinuity_indicator */ 317 if ((buf[4] > 0) && (buf[5] & 0x80)) 318 dc_i = 1; 319 } 320 321 if (!ccok || dc_i) { 322 if (dc_i) { 323 set_buf_flags(feed, 324 DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR); 325 dprintk_sect_loss("%d frame with disconnect indicator\n", 326 cc); 327 } else { 328 set_buf_flags(feed, 329 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); 330 dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n", 331 cc, (feed->cc + 1) & 0x0f, count + 4); 332 } 333 /* 334 * those bytes under some circumstances will again be reported 335 * in the following dvb_dmx_swfilter_section_new 336 */ 337 338 /* 339 * Discontinuity detected. Reset pusi_seen to 340 * stop feeding of suspicious data until next PUSI=1 arrives 341 * 342 * FIXME: does it make sense if the MPEG-TS is the one 343 * reporting discontinuity? 344 */ 345 346 feed->pusi_seen = false; 347 dvb_dmx_swfilter_section_new(feed); 348 } 349 350 if (buf[1] & 0x40) { 351 /* PUSI=1 (is set), section boundary is here */ 352 if (count > 1 && buf[p] < count) { 353 const u8 *before = &buf[p + 1]; 354 u8 before_len = buf[p]; 355 const u8 *after = &before[before_len]; 356 u8 after_len = count - 1 - before_len; 357 358 dvb_dmx_swfilter_section_copy_dump(feed, before, 359 before_len); 360 /* before start of new section, set pusi_seen */ 361 feed->pusi_seen = true; 362 dvb_dmx_swfilter_section_new(feed); 363 dvb_dmx_swfilter_section_copy_dump(feed, after, 364 after_len); 365 } else if (count > 0) { 366 set_buf_flags(feed, 367 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED); 368 dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count); 369 } 370 } else { 371 /* PUSI=0 (is not set), no section boundary */ 372 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count); 373 } 374 375 return 0; 376 } 377 378 static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed, 379 const u8 *buf) 380 { 381 switch (feed->type) { 382 case DMX_TYPE_TS: 383 if (!feed->feed.ts.is_filtering) 384 break; 385 if (feed->ts_type & TS_PACKET) { 386 if (feed->ts_type & TS_PAYLOAD_ONLY) 387 dvb_dmx_swfilter_payload(feed, buf); 388 else 389 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, 390 &feed->buffer_flags); 391 } 392 /* Used only on full-featured devices */ 393 if (feed->ts_type & TS_DECODER) 394 if (feed->demux->write_to_decoder) 395 feed->demux->write_to_decoder(feed, buf, 188); 396 break; 397 398 case DMX_TYPE_SEC: 399 if (!feed->feed.sec.is_filtering) 400 break; 401 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0) 402 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0; 403 break; 404 405 default: 406 break; 407 } 408 } 409 410 #define DVR_FEED(f) \ 411 (((f)->type == DMX_TYPE_TS) && \ 412 ((f)->feed.ts.is_filtering) && \ 413 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET)) 414 415 static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf) 416 { 417 struct dvb_demux_feed *feed; 418 u16 pid = ts_pid(buf); 419 int dvr_done = 0; 420 421 if (dvb_demux_speedcheck) { 422 ktime_t cur_time; 423 u64 speed_bytes, speed_timedelta; 424 425 demux->speed_pkts_cnt++; 426 427 /* show speed every SPEED_PKTS_INTERVAL packets */ 428 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) { 429 cur_time = ktime_get(); 430 431 if (ktime_to_ns(demux->speed_last_time) != 0) { 432 speed_bytes = (u64)demux->speed_pkts_cnt 433 * 188 * 8; 434 /* convert to 1024 basis */ 435 speed_bytes = 1000 * div64_u64(speed_bytes, 436 1024); 437 speed_timedelta = ktime_ms_delta(cur_time, 438 demux->speed_last_time); 439 if (speed_timedelta) 440 dprintk("TS speed %llu Kbits/sec \n", 441 div64_u64(speed_bytes, 442 speed_timedelta)); 443 } 444 445 demux->speed_last_time = cur_time; 446 demux->speed_pkts_cnt = 0; 447 } 448 } 449 450 if (buf[1] & 0x80) { 451 list_for_each_entry(feed, &demux->feed_list, list_head) { 452 if ((feed->pid != pid) && (feed->pid != 0x2000)) 453 continue; 454 set_buf_flags(feed, DMX_BUFFER_FLAG_TEI); 455 } 456 dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n", 457 pid, buf[1]); 458 /* data in this packet can't be trusted - drop it unless 459 * module option dvb_demux_feed_err_pkts is set */ 460 if (!dvb_demux_feed_err_pkts) 461 return; 462 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */ 463 if (demux->cnt_storage && dvb_demux_tscheck) { 464 /* check pkt counter */ 465 if (pid < MAX_PID) { 466 if (buf[3] & 0x10) 467 demux->cnt_storage[pid] = 468 (demux->cnt_storage[pid] + 1) & 0xf; 469 470 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) { 471 list_for_each_entry(feed, &demux->feed_list, list_head) { 472 if ((feed->pid != pid) && (feed->pid != 0x2000)) 473 continue; 474 set_buf_flags(feed, 475 DMX_BUFFER_PKT_COUNTER_MISMATCH); 476 } 477 478 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n", 479 pid, demux->cnt_storage[pid], 480 buf[3] & 0xf); 481 demux->cnt_storage[pid] = buf[3] & 0xf; 482 } 483 } 484 /* end check */ 485 } 486 487 list_for_each_entry(feed, &demux->feed_list, list_head) { 488 if ((feed->pid != pid) && (feed->pid != 0x2000)) 489 continue; 490 491 /* copy each packet only once to the dvr device, even 492 * if a PID is in multiple filters (e.g. video + PCR) */ 493 if ((DVR_FEED(feed)) && (dvr_done++)) 494 continue; 495 496 if (feed->pid == pid) 497 dvb_dmx_swfilter_packet_type(feed, buf); 498 else if (feed->pid == 0x2000) 499 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts, 500 &feed->buffer_flags); 501 } 502 } 503 504 void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf, 505 size_t count) 506 { 507 unsigned long flags; 508 509 spin_lock_irqsave(&demux->lock, flags); 510 511 while (count--) { 512 if (buf[0] == 0x47) 513 dvb_dmx_swfilter_packet(demux, buf); 514 buf += 188; 515 } 516 517 spin_unlock_irqrestore(&demux->lock, flags); 518 } 519 520 EXPORT_SYMBOL(dvb_dmx_swfilter_packets); 521 522 static inline int find_next_packet(const u8 *buf, int pos, size_t count, 523 const int pktsize) 524 { 525 int start = pos, lost; 526 527 while (pos < count) { 528 if (buf[pos] == 0x47 || 529 (pktsize == 204 && buf[pos] == 0xB8)) 530 break; 531 pos++; 532 } 533 534 lost = pos - start; 535 if (lost) { 536 /* This garbage is part of a valid packet? */ 537 int backtrack = pos - pktsize; 538 if (backtrack >= 0 && (buf[backtrack] == 0x47 || 539 (pktsize == 204 && buf[backtrack] == 0xB8))) 540 return backtrack; 541 } 542 543 return pos; 544 } 545 546 /* Filter all pktsize= 188 or 204 sized packets and skip garbage. */ 547 static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, 548 size_t count, const int pktsize) 549 { 550 int p = 0, i, j; 551 const u8 *q; 552 unsigned long flags; 553 554 spin_lock_irqsave(&demux->lock, flags); 555 556 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */ 557 i = demux->tsbufp; 558 j = pktsize - i; 559 if (count < j) { 560 memcpy(&demux->tsbuf[i], buf, count); 561 demux->tsbufp += count; 562 goto bailout; 563 } 564 memcpy(&demux->tsbuf[i], buf, j); 565 if (demux->tsbuf[0] == 0x47) /* double check */ 566 dvb_dmx_swfilter_packet(demux, demux->tsbuf); 567 demux->tsbufp = 0; 568 p += j; 569 } 570 571 while (1) { 572 p = find_next_packet(buf, p, count, pktsize); 573 if (p >= count) 574 break; 575 if (count - p < pktsize) 576 break; 577 578 q = &buf[p]; 579 580 if (pktsize == 204 && (*q == 0xB8)) { 581 memcpy(demux->tsbuf, q, 188); 582 demux->tsbuf[0] = 0x47; 583 q = demux->tsbuf; 584 } 585 dvb_dmx_swfilter_packet(demux, q); 586 p += pktsize; 587 } 588 589 i = count - p; 590 if (i) { 591 memcpy(demux->tsbuf, &buf[p], i); 592 demux->tsbufp = i; 593 if (pktsize == 204 && demux->tsbuf[0] == 0xB8) 594 demux->tsbuf[0] = 0x47; 595 } 596 597 bailout: 598 spin_unlock_irqrestore(&demux->lock, flags); 599 } 600 601 void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count) 602 { 603 _dvb_dmx_swfilter(demux, buf, count, 188); 604 } 605 EXPORT_SYMBOL(dvb_dmx_swfilter); 606 607 void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count) 608 { 609 _dvb_dmx_swfilter(demux, buf, count, 204); 610 } 611 EXPORT_SYMBOL(dvb_dmx_swfilter_204); 612 613 void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count) 614 { 615 unsigned long flags; 616 617 spin_lock_irqsave(&demux->lock, flags); 618 619 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts, 620 &demux->feed->buffer_flags); 621 622 spin_unlock_irqrestore(&demux->lock, flags); 623 } 624 EXPORT_SYMBOL(dvb_dmx_swfilter_raw); 625 626 static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux) 627 { 628 int i; 629 630 for (i = 0; i < demux->filternum; i++) 631 if (demux->filter[i].state == DMX_STATE_FREE) 632 break; 633 634 if (i == demux->filternum) 635 return NULL; 636 637 demux->filter[i].state = DMX_STATE_ALLOCATED; 638 639 return &demux->filter[i]; 640 } 641 642 static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux) 643 { 644 int i; 645 646 for (i = 0; i < demux->feednum; i++) 647 if (demux->feed[i].state == DMX_STATE_FREE) 648 break; 649 650 if (i == demux->feednum) 651 return NULL; 652 653 demux->feed[i].state = DMX_STATE_ALLOCATED; 654 655 return &demux->feed[i]; 656 } 657 658 static int dvb_demux_feed_find(struct dvb_demux_feed *feed) 659 { 660 struct dvb_demux_feed *entry; 661 662 list_for_each_entry(entry, &feed->demux->feed_list, list_head) 663 if (entry == feed) 664 return 1; 665 666 return 0; 667 } 668 669 static void dvb_demux_feed_add(struct dvb_demux_feed *feed) 670 { 671 spin_lock_irq(&feed->demux->lock); 672 if (dvb_demux_feed_find(feed)) { 673 pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n", 674 __func__, feed->type, feed->state, feed->pid); 675 goto out; 676 } 677 678 list_add(&feed->list_head, &feed->demux->feed_list); 679 out: 680 spin_unlock_irq(&feed->demux->lock); 681 } 682 683 static void dvb_demux_feed_del(struct dvb_demux_feed *feed) 684 { 685 spin_lock_irq(&feed->demux->lock); 686 if (!(dvb_demux_feed_find(feed))) { 687 pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n", 688 __func__, feed->type, feed->state, feed->pid); 689 goto out; 690 } 691 692 list_del(&feed->list_head); 693 out: 694 spin_unlock_irq(&feed->demux->lock); 695 } 696 697 static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type, 698 enum dmx_ts_pes pes_type, ktime_t timeout) 699 { 700 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 701 struct dvb_demux *demux = feed->demux; 702 703 if (pid > DMX_MAX_PID) 704 return -EINVAL; 705 706 if (mutex_lock_interruptible(&demux->mutex)) 707 return -ERESTARTSYS; 708 709 if (ts_type & TS_DECODER) { 710 if (pes_type >= DMX_PES_OTHER) { 711 mutex_unlock(&demux->mutex); 712 return -EINVAL; 713 } 714 715 if (demux->pesfilter[pes_type] && 716 demux->pesfilter[pes_type] != feed) { 717 mutex_unlock(&demux->mutex); 718 return -EINVAL; 719 } 720 721 demux->pesfilter[pes_type] = feed; 722 demux->pids[pes_type] = pid; 723 } 724 725 dvb_demux_feed_add(feed); 726 727 feed->pid = pid; 728 feed->timeout = timeout; 729 feed->ts_type = ts_type; 730 feed->pes_type = pes_type; 731 732 feed->state = DMX_STATE_READY; 733 mutex_unlock(&demux->mutex); 734 735 return 0; 736 } 737 738 static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed) 739 { 740 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 741 struct dvb_demux *demux = feed->demux; 742 int ret; 743 744 if (mutex_lock_interruptible(&demux->mutex)) 745 return -ERESTARTSYS; 746 747 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) { 748 mutex_unlock(&demux->mutex); 749 return -EINVAL; 750 } 751 752 if (!demux->start_feed) { 753 mutex_unlock(&demux->mutex); 754 return -ENODEV; 755 } 756 757 if ((ret = demux->start_feed(feed)) < 0) { 758 mutex_unlock(&demux->mutex); 759 return ret; 760 } 761 762 spin_lock_irq(&demux->lock); 763 ts_feed->is_filtering = 1; 764 feed->state = DMX_STATE_GO; 765 spin_unlock_irq(&demux->lock); 766 mutex_unlock(&demux->mutex); 767 768 return 0; 769 } 770 771 static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed) 772 { 773 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 774 struct dvb_demux *demux = feed->demux; 775 int ret; 776 777 mutex_lock(&demux->mutex); 778 779 if (feed->state < DMX_STATE_GO) { 780 mutex_unlock(&demux->mutex); 781 return -EINVAL; 782 } 783 784 if (!demux->stop_feed) { 785 mutex_unlock(&demux->mutex); 786 return -ENODEV; 787 } 788 789 ret = demux->stop_feed(feed); 790 791 spin_lock_irq(&demux->lock); 792 ts_feed->is_filtering = 0; 793 feed->state = DMX_STATE_ALLOCATED; 794 spin_unlock_irq(&demux->lock); 795 mutex_unlock(&demux->mutex); 796 797 return ret; 798 } 799 800 static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx, 801 struct dmx_ts_feed **ts_feed, 802 dmx_ts_cb callback) 803 { 804 struct dvb_demux *demux = (struct dvb_demux *)dmx; 805 struct dvb_demux_feed *feed; 806 807 if (mutex_lock_interruptible(&demux->mutex)) 808 return -ERESTARTSYS; 809 810 if (!(feed = dvb_dmx_feed_alloc(demux))) { 811 mutex_unlock(&demux->mutex); 812 return -EBUSY; 813 } 814 815 feed->type = DMX_TYPE_TS; 816 feed->cb.ts = callback; 817 feed->demux = demux; 818 feed->pid = 0xffff; 819 feed->peslen = 0xfffa; 820 feed->buffer_flags = 0; 821 822 (*ts_feed) = &feed->feed.ts; 823 (*ts_feed)->parent = dmx; 824 (*ts_feed)->priv = NULL; 825 (*ts_feed)->is_filtering = 0; 826 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering; 827 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering; 828 (*ts_feed)->set = dmx_ts_feed_set; 829 830 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) { 831 feed->state = DMX_STATE_FREE; 832 mutex_unlock(&demux->mutex); 833 return -EBUSY; 834 } 835 836 feed->filter->type = DMX_TYPE_TS; 837 feed->filter->feed = feed; 838 feed->filter->state = DMX_STATE_READY; 839 840 mutex_unlock(&demux->mutex); 841 842 return 0; 843 } 844 845 static int dvbdmx_release_ts_feed(struct dmx_demux *dmx, 846 struct dmx_ts_feed *ts_feed) 847 { 848 struct dvb_demux *demux = (struct dvb_demux *)dmx; 849 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed; 850 851 mutex_lock(&demux->mutex); 852 853 if (feed->state == DMX_STATE_FREE) { 854 mutex_unlock(&demux->mutex); 855 return -EINVAL; 856 } 857 858 feed->state = DMX_STATE_FREE; 859 feed->filter->state = DMX_STATE_FREE; 860 861 dvb_demux_feed_del(feed); 862 863 feed->pid = 0xffff; 864 865 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER) 866 demux->pesfilter[feed->pes_type] = NULL; 867 868 mutex_unlock(&demux->mutex); 869 return 0; 870 } 871 872 /****************************************************************************** 873 * dmx_section_feed API calls 874 ******************************************************************************/ 875 876 static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed, 877 struct dmx_section_filter **filter) 878 { 879 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 880 struct dvb_demux *dvbdemux = dvbdmxfeed->demux; 881 struct dvb_demux_filter *dvbdmxfilter; 882 883 if (mutex_lock_interruptible(&dvbdemux->mutex)) 884 return -ERESTARTSYS; 885 886 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux); 887 if (!dvbdmxfilter) { 888 mutex_unlock(&dvbdemux->mutex); 889 return -EBUSY; 890 } 891 892 spin_lock_irq(&dvbdemux->lock); 893 *filter = &dvbdmxfilter->filter; 894 (*filter)->parent = feed; 895 (*filter)->priv = NULL; 896 dvbdmxfilter->feed = dvbdmxfeed; 897 dvbdmxfilter->type = DMX_TYPE_SEC; 898 dvbdmxfilter->state = DMX_STATE_READY; 899 dvbdmxfilter->next = dvbdmxfeed->filter; 900 dvbdmxfeed->filter = dvbdmxfilter; 901 spin_unlock_irq(&dvbdemux->lock); 902 903 mutex_unlock(&dvbdemux->mutex); 904 return 0; 905 } 906 907 static int dmx_section_feed_set(struct dmx_section_feed *feed, 908 u16 pid, int check_crc) 909 { 910 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 911 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 912 913 if (pid > 0x1fff) 914 return -EINVAL; 915 916 if (mutex_lock_interruptible(&dvbdmx->mutex)) 917 return -ERESTARTSYS; 918 919 dvb_demux_feed_add(dvbdmxfeed); 920 921 dvbdmxfeed->pid = pid; 922 dvbdmxfeed->feed.sec.check_crc = check_crc; 923 924 dvbdmxfeed->state = DMX_STATE_READY; 925 mutex_unlock(&dvbdmx->mutex); 926 return 0; 927 } 928 929 static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed) 930 { 931 int i; 932 struct dvb_demux_filter *f; 933 struct dmx_section_filter *sf; 934 u8 mask, mode, doneq; 935 936 if (!(f = dvbdmxfeed->filter)) 937 return; 938 do { 939 sf = &f->filter; 940 doneq = false; 941 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) { 942 mode = sf->filter_mode[i]; 943 mask = sf->filter_mask[i]; 944 f->maskandmode[i] = mask & mode; 945 doneq |= f->maskandnotmode[i] = mask & ~mode; 946 } 947 f->doneq = doneq ? true : false; 948 } while ((f = f->next)); 949 } 950 951 static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed) 952 { 953 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 954 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 955 int ret; 956 957 if (mutex_lock_interruptible(&dvbdmx->mutex)) 958 return -ERESTARTSYS; 959 960 if (feed->is_filtering) { 961 mutex_unlock(&dvbdmx->mutex); 962 return -EBUSY; 963 } 964 965 if (!dvbdmxfeed->filter) { 966 mutex_unlock(&dvbdmx->mutex); 967 return -EINVAL; 968 } 969 970 dvbdmxfeed->feed.sec.tsfeedp = 0; 971 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 972 dvbdmxfeed->feed.sec.secbufp = 0; 973 dvbdmxfeed->feed.sec.seclen = 0; 974 975 if (!dvbdmx->start_feed) { 976 mutex_unlock(&dvbdmx->mutex); 977 return -ENODEV; 978 } 979 980 prepare_secfilters(dvbdmxfeed); 981 982 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) { 983 mutex_unlock(&dvbdmx->mutex); 984 return ret; 985 } 986 987 spin_lock_irq(&dvbdmx->lock); 988 feed->is_filtering = 1; 989 dvbdmxfeed->state = DMX_STATE_GO; 990 spin_unlock_irq(&dvbdmx->lock); 991 992 mutex_unlock(&dvbdmx->mutex); 993 return 0; 994 } 995 996 static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed) 997 { 998 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 999 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1000 int ret; 1001 1002 mutex_lock(&dvbdmx->mutex); 1003 1004 if (!dvbdmx->stop_feed) { 1005 mutex_unlock(&dvbdmx->mutex); 1006 return -ENODEV; 1007 } 1008 1009 ret = dvbdmx->stop_feed(dvbdmxfeed); 1010 1011 spin_lock_irq(&dvbdmx->lock); 1012 dvbdmxfeed->state = DMX_STATE_READY; 1013 feed->is_filtering = 0; 1014 spin_unlock_irq(&dvbdmx->lock); 1015 1016 mutex_unlock(&dvbdmx->mutex); 1017 return ret; 1018 } 1019 1020 static int dmx_section_feed_release_filter(struct dmx_section_feed *feed, 1021 struct dmx_section_filter *filter) 1022 { 1023 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f; 1024 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1025 struct dvb_demux *dvbdmx = dvbdmxfeed->demux; 1026 1027 mutex_lock(&dvbdmx->mutex); 1028 1029 if (dvbdmxfilter->feed != dvbdmxfeed) { 1030 mutex_unlock(&dvbdmx->mutex); 1031 return -EINVAL; 1032 } 1033 1034 if (feed->is_filtering) { 1035 /* release dvbdmx->mutex as far as it is 1036 acquired by stop_filtering() itself */ 1037 mutex_unlock(&dvbdmx->mutex); 1038 feed->stop_filtering(feed); 1039 mutex_lock(&dvbdmx->mutex); 1040 } 1041 1042 spin_lock_irq(&dvbdmx->lock); 1043 f = dvbdmxfeed->filter; 1044 1045 if (f == dvbdmxfilter) { 1046 dvbdmxfeed->filter = dvbdmxfilter->next; 1047 } else { 1048 while (f->next != dvbdmxfilter) 1049 f = f->next; 1050 f->next = f->next->next; 1051 } 1052 1053 dvbdmxfilter->state = DMX_STATE_FREE; 1054 spin_unlock_irq(&dvbdmx->lock); 1055 mutex_unlock(&dvbdmx->mutex); 1056 return 0; 1057 } 1058 1059 static int dvbdmx_allocate_section_feed(struct dmx_demux *demux, 1060 struct dmx_section_feed **feed, 1061 dmx_section_cb callback) 1062 { 1063 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1064 struct dvb_demux_feed *dvbdmxfeed; 1065 1066 if (mutex_lock_interruptible(&dvbdmx->mutex)) 1067 return -ERESTARTSYS; 1068 1069 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) { 1070 mutex_unlock(&dvbdmx->mutex); 1071 return -EBUSY; 1072 } 1073 1074 dvbdmxfeed->type = DMX_TYPE_SEC; 1075 dvbdmxfeed->cb.sec = callback; 1076 dvbdmxfeed->demux = dvbdmx; 1077 dvbdmxfeed->pid = 0xffff; 1078 dvbdmxfeed->buffer_flags = 0; 1079 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base; 1080 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0; 1081 dvbdmxfeed->feed.sec.tsfeedp = 0; 1082 dvbdmxfeed->filter = NULL; 1083 1084 (*feed) = &dvbdmxfeed->feed.sec; 1085 (*feed)->is_filtering = 0; 1086 (*feed)->parent = demux; 1087 (*feed)->priv = NULL; 1088 1089 (*feed)->set = dmx_section_feed_set; 1090 (*feed)->allocate_filter = dmx_section_feed_allocate_filter; 1091 (*feed)->start_filtering = dmx_section_feed_start_filtering; 1092 (*feed)->stop_filtering = dmx_section_feed_stop_filtering; 1093 (*feed)->release_filter = dmx_section_feed_release_filter; 1094 1095 mutex_unlock(&dvbdmx->mutex); 1096 return 0; 1097 } 1098 1099 static int dvbdmx_release_section_feed(struct dmx_demux *demux, 1100 struct dmx_section_feed *feed) 1101 { 1102 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed; 1103 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux; 1104 1105 mutex_lock(&dvbdmx->mutex); 1106 1107 if (dvbdmxfeed->state == DMX_STATE_FREE) { 1108 mutex_unlock(&dvbdmx->mutex); 1109 return -EINVAL; 1110 } 1111 dvbdmxfeed->state = DMX_STATE_FREE; 1112 1113 dvb_demux_feed_del(dvbdmxfeed); 1114 1115 dvbdmxfeed->pid = 0xffff; 1116 1117 mutex_unlock(&dvbdmx->mutex); 1118 return 0; 1119 } 1120 1121 /****************************************************************************** 1122 * dvb_demux kernel data API calls 1123 ******************************************************************************/ 1124 1125 static int dvbdmx_open(struct dmx_demux *demux) 1126 { 1127 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1128 1129 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS) 1130 return -EUSERS; 1131 1132 dvbdemux->users++; 1133 return 0; 1134 } 1135 1136 static int dvbdmx_close(struct dmx_demux *demux) 1137 { 1138 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1139 1140 if (dvbdemux->users == 0) 1141 return -ENODEV; 1142 1143 dvbdemux->users--; 1144 //FIXME: release any unneeded resources if users==0 1145 return 0; 1146 } 1147 1148 static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count) 1149 { 1150 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1151 void *p; 1152 1153 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE)) 1154 return -EINVAL; 1155 1156 p = memdup_user(buf, count); 1157 if (IS_ERR(p)) 1158 return PTR_ERR(p); 1159 if (mutex_lock_interruptible(&dvbdemux->mutex)) { 1160 kfree(p); 1161 return -ERESTARTSYS; 1162 } 1163 dvb_dmx_swfilter(dvbdemux, p, count); 1164 kfree(p); 1165 mutex_unlock(&dvbdemux->mutex); 1166 1167 if (signal_pending(current)) 1168 return -EINTR; 1169 return count; 1170 } 1171 1172 static int dvbdmx_add_frontend(struct dmx_demux *demux, 1173 struct dmx_frontend *frontend) 1174 { 1175 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1176 struct list_head *head = &dvbdemux->frontend_list; 1177 1178 list_add(&(frontend->connectivity_list), head); 1179 1180 return 0; 1181 } 1182 1183 static int dvbdmx_remove_frontend(struct dmx_demux *demux, 1184 struct dmx_frontend *frontend) 1185 { 1186 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1187 struct list_head *pos, *n, *head = &dvbdemux->frontend_list; 1188 1189 list_for_each_safe(pos, n, head) { 1190 if (DMX_FE_ENTRY(pos) == frontend) { 1191 list_del(pos); 1192 return 0; 1193 } 1194 } 1195 1196 return -ENODEV; 1197 } 1198 1199 static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux) 1200 { 1201 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1202 1203 if (list_empty(&dvbdemux->frontend_list)) 1204 return NULL; 1205 1206 return &dvbdemux->frontend_list; 1207 } 1208 1209 static int dvbdmx_connect_frontend(struct dmx_demux *demux, 1210 struct dmx_frontend *frontend) 1211 { 1212 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1213 1214 if (demux->frontend) 1215 return -EINVAL; 1216 1217 mutex_lock(&dvbdemux->mutex); 1218 1219 demux->frontend = frontend; 1220 mutex_unlock(&dvbdemux->mutex); 1221 return 0; 1222 } 1223 1224 static int dvbdmx_disconnect_frontend(struct dmx_demux *demux) 1225 { 1226 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1227 1228 mutex_lock(&dvbdemux->mutex); 1229 1230 demux->frontend = NULL; 1231 mutex_unlock(&dvbdemux->mutex); 1232 return 0; 1233 } 1234 1235 static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids) 1236 { 1237 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux; 1238 1239 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16)); 1240 return 0; 1241 } 1242 1243 int dvb_dmx_init(struct dvb_demux *dvbdemux) 1244 { 1245 int i; 1246 struct dmx_demux *dmx = &dvbdemux->dmx; 1247 1248 dvbdemux->cnt_storage = NULL; 1249 dvbdemux->users = 0; 1250 dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter), 1251 dvbdemux->filternum)); 1252 1253 if (!dvbdemux->filter) 1254 return -ENOMEM; 1255 1256 dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed), 1257 dvbdemux->feednum)); 1258 if (!dvbdemux->feed) { 1259 vfree(dvbdemux->filter); 1260 dvbdemux->filter = NULL; 1261 return -ENOMEM; 1262 } 1263 for (i = 0; i < dvbdemux->filternum; i++) { 1264 dvbdemux->filter[i].state = DMX_STATE_FREE; 1265 dvbdemux->filter[i].index = i; 1266 } 1267 for (i = 0; i < dvbdemux->feednum; i++) { 1268 dvbdemux->feed[i].state = DMX_STATE_FREE; 1269 dvbdemux->feed[i].index = i; 1270 } 1271 1272 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1); 1273 if (!dvbdemux->cnt_storage) 1274 pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n"); 1275 1276 INIT_LIST_HEAD(&dvbdemux->frontend_list); 1277 1278 for (i = 0; i < DMX_PES_OTHER; i++) { 1279 dvbdemux->pesfilter[i] = NULL; 1280 dvbdemux->pids[i] = 0xffff; 1281 } 1282 1283 INIT_LIST_HEAD(&dvbdemux->feed_list); 1284 1285 dvbdemux->playing = 0; 1286 dvbdemux->recording = 0; 1287 dvbdemux->tsbufp = 0; 1288 1289 if (!dvbdemux->check_crc32) 1290 dvbdemux->check_crc32 = dvb_dmx_crc32; 1291 1292 if (!dvbdemux->memcopy) 1293 dvbdemux->memcopy = dvb_dmx_memcopy; 1294 1295 dmx->frontend = NULL; 1296 dmx->priv = dvbdemux; 1297 dmx->open = dvbdmx_open; 1298 dmx->close = dvbdmx_close; 1299 dmx->write = dvbdmx_write; 1300 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed; 1301 dmx->release_ts_feed = dvbdmx_release_ts_feed; 1302 dmx->allocate_section_feed = dvbdmx_allocate_section_feed; 1303 dmx->release_section_feed = dvbdmx_release_section_feed; 1304 1305 dmx->add_frontend = dvbdmx_add_frontend; 1306 dmx->remove_frontend = dvbdmx_remove_frontend; 1307 dmx->get_frontends = dvbdmx_get_frontends; 1308 dmx->connect_frontend = dvbdmx_connect_frontend; 1309 dmx->disconnect_frontend = dvbdmx_disconnect_frontend; 1310 dmx->get_pes_pids = dvbdmx_get_pes_pids; 1311 1312 mutex_init(&dvbdemux->mutex); 1313 spin_lock_init(&dvbdemux->lock); 1314 1315 return 0; 1316 } 1317 1318 EXPORT_SYMBOL(dvb_dmx_init); 1319 1320 void dvb_dmx_release(struct dvb_demux *dvbdemux) 1321 { 1322 vfree(dvbdemux->cnt_storage); 1323 vfree(dvbdemux->filter); 1324 vfree(dvbdemux->feed); 1325 } 1326 1327 EXPORT_SYMBOL(dvb_dmx_release); 1328