1319 lines · c
1// SPDX-License-Identifier: LGPL-2.1-or-later2/*3 * dvb_demux.c - DVB kernel demux API4 *5 * Copyright (C) 2000-2001 Ralph Metzler <ralph@convergence.de>6 * & Marcus Metzler <marcus@convergence.de>7 * for convergence integrated media GmbH8 */9 10#define pr_fmt(fmt) "dvb_demux: " fmt11 12#include <linux/sched/signal.h>13#include <linux/spinlock.h>14#include <linux/slab.h>15#include <linux/vmalloc.h>16#include <linux/module.h>17#include <linux/poll.h>18#include <linux/string.h>19#include <linux/crc32.h>20#include <linux/uaccess.h>21#include <asm/div64.h>22 23#include <media/dvb_demux.h>24 25static int dvb_demux_tscheck;26module_param(dvb_demux_tscheck, int, 0644);27MODULE_PARM_DESC(dvb_demux_tscheck,28 "enable transport stream continuity and TEI check");29 30static int dvb_demux_speedcheck;31module_param(dvb_demux_speedcheck, int, 0644);32MODULE_PARM_DESC(dvb_demux_speedcheck,33 "enable transport stream speed check");34 35static int dvb_demux_feed_err_pkts = 1;36module_param(dvb_demux_feed_err_pkts, int, 0644);37MODULE_PARM_DESC(dvb_demux_feed_err_pkts,38 "when set to 0, drop packets with the TEI bit set (1 by default)");39 40#define dprintk(fmt, arg...) \41 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg)42 43#define dprintk_tscheck(x...) do { \44 if (dvb_demux_tscheck && printk_ratelimit()) \45 dprintk(x); \46} while (0)47 48#ifdef CONFIG_DVB_DEMUX_SECTION_LOSS_LOG49# define dprintk_sect_loss(x...) dprintk(x)50#else51# define dprintk_sect_loss(x...)52#endif53 54#define set_buf_flags(__feed, __flag) \55 do { \56 (__feed)->buffer_flags |= (__flag); \57 } while (0)58 59/******************************************************************************60 * static inlined helper functions61 ******************************************************************************/62 63static inline u16 section_length(const u8 *buf)64{65 return 3 + ((buf[1] & 0x0f) << 8) + buf[2];66}67 68static inline u16 ts_pid(const u8 *buf)69{70 return ((buf[1] & 0x1f) << 8) + buf[2];71}72 73static inline u8 payload(const u8 *tsp)74{75 if (!(tsp[3] & 0x10)) // no payload?76 return 0;77 78 if (tsp[3] & 0x20) { // adaptation field?79 if (tsp[4] > 183) // corrupted data?80 return 0;81 else82 return 184 - 1 - tsp[4];83 }84 85 return 184;86}87 88static u32 dvb_dmx_crc32(struct dvb_demux_feed *f, const u8 *src, size_t len)89{90 return (f->feed.sec.crc_val = crc32_be(f->feed.sec.crc_val, src, len));91}92 93static void dvb_dmx_memcopy(struct dvb_demux_feed *f, u8 *d, const u8 *s,94 size_t len)95{96 memcpy(d, s, len);97}98 99/******************************************************************************100 * Software filter functions101 ******************************************************************************/102 103static inline int dvb_dmx_swfilter_payload(struct dvb_demux_feed *feed,104 const u8 *buf)105{106 int count = payload(buf);107 int p;108 int ccok;109 u8 cc;110 111 if (count == 0)112 return -1;113 114 p = 188 - count;115 116 cc = buf[3] & 0x0f;117 ccok = ((feed->cc + 1) & 0x0f) == cc;118 if (!ccok) {119 set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);120 dprintk_sect_loss("missed packet: %d instead of %d!\n",121 cc, (feed->cc + 1) & 0x0f);122 }123 feed->cc = cc;124 125 if (buf[1] & 0x40) // PUSI ?126 feed->peslen = 0xfffa;127 128 feed->peslen += count;129 130 return feed->cb.ts(&buf[p], count, NULL, 0, &feed->feed.ts,131 &feed->buffer_flags);132}133 134static int dvb_dmx_swfilter_sectionfilter(struct dvb_demux_feed *feed,135 struct dvb_demux_filter *f)136{137 u8 neq = 0;138 int i;139 140 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {141 u8 xor = f->filter.filter_value[i] ^ feed->feed.sec.secbuf[i];142 143 if (f->maskandmode[i] & xor)144 return 0;145 146 neq |= f->maskandnotmode[i] & xor;147 }148 149 if (f->doneq && !neq)150 return 0;151 152 return feed->cb.sec(feed->feed.sec.secbuf, feed->feed.sec.seclen,153 NULL, 0, &f->filter, &feed->buffer_flags);154}155 156static inline int dvb_dmx_swfilter_section_feed(struct dvb_demux_feed *feed)157{158 struct dvb_demux *demux = feed->demux;159 struct dvb_demux_filter *f = feed->filter;160 struct dmx_section_feed *sec = &feed->feed.sec;161 int section_syntax_indicator;162 163 if (!sec->is_filtering)164 return 0;165 166 if (!f)167 return 0;168 169 if (sec->check_crc) {170 section_syntax_indicator = ((sec->secbuf[1] & 0x80) != 0);171 if (section_syntax_indicator &&172 demux->check_crc32(feed, sec->secbuf, sec->seclen)) {173 set_buf_flags(feed, DMX_BUFFER_FLAG_HAD_CRC32_DISCARD);174 return -1;175 }176 }177 178 do {179 if (dvb_dmx_swfilter_sectionfilter(feed, f) < 0)180 return -1;181 } while ((f = f->next) && sec->is_filtering);182 183 sec->seclen = 0;184 185 return 0;186}187 188static void dvb_dmx_swfilter_section_new(struct dvb_demux_feed *feed)189{190 struct dmx_section_feed *sec = &feed->feed.sec;191 192 if (sec->secbufp < sec->tsfeedp) {193 int n = sec->tsfeedp - sec->secbufp;194 195 /*196 * Section padding is done with 0xff bytes entirely.197 * Due to speed reasons, we won't check all of them198 * but just first and last.199 */200 if (sec->secbuf[0] != 0xff || sec->secbuf[n - 1] != 0xff) {201 set_buf_flags(feed,202 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);203 dprintk_sect_loss("section ts padding loss: %d/%d\n",204 n, sec->tsfeedp);205 dprintk_sect_loss("pad data: %*ph\n", n, sec->secbuf);206 }207 }208 209 sec->tsfeedp = sec->secbufp = sec->seclen = 0;210 sec->secbuf = sec->secbuf_base;211}212 213/*214 * Losless Section Demux 1.4.1 by Emard215 * Valsecchi Patrick:216 * - middle of section A (no PUSI)217 * - end of section A and start of section B218 * (with PUSI pointing to the start of the second section)219 *220 * In this case, without feed->pusi_seen you'll receive a garbage section221 * consisting of the end of section A. Basically because tsfeedp222 * is incemented and the use=0 condition is not raised223 * when the second packet arrives.224 *225 * Fix:226 * when demux is started, let feed->pusi_seen = false to227 * prevent initial feeding of garbage from the end of228 * previous section. When you for the first time see PUSI=1229 * then set feed->pusi_seen = true230 */231static int dvb_dmx_swfilter_section_copy_dump(struct dvb_demux_feed *feed,232 const u8 *buf, u8 len)233{234 struct dvb_demux *demux = feed->demux;235 struct dmx_section_feed *sec = &feed->feed.sec;236 u16 limit, seclen;237 238 if (sec->tsfeedp >= DMX_MAX_SECFEED_SIZE)239 return 0;240 241 if (sec->tsfeedp + len > DMX_MAX_SECFEED_SIZE) {242 set_buf_flags(feed, DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);243 dprintk_sect_loss("section buffer full loss: %d/%d\n",244 sec->tsfeedp + len - DMX_MAX_SECFEED_SIZE,245 DMX_MAX_SECFEED_SIZE);246 len = DMX_MAX_SECFEED_SIZE - sec->tsfeedp;247 }248 249 if (len <= 0)250 return 0;251 252 demux->memcopy(feed, sec->secbuf_base + sec->tsfeedp, buf, len);253 sec->tsfeedp += len;254 255 /*256 * Dump all the sections we can find in the data (Emard)257 */258 limit = sec->tsfeedp;259 if (limit > DMX_MAX_SECFEED_SIZE)260 return -1; /* internal error should never happen */261 262 /* to be sure always set secbuf */263 sec->secbuf = sec->secbuf_base + sec->secbufp;264 265 while (sec->secbufp + 2 < limit) {266 seclen = section_length(sec->secbuf);267 if (seclen <= 0 || seclen > DMX_MAX_SECTION_SIZE268 || seclen + sec->secbufp > limit)269 return 0;270 sec->seclen = seclen;271 sec->crc_val = ~0;272 /* dump [secbuf .. secbuf+seclen) */273 if (feed->pusi_seen) {274 dvb_dmx_swfilter_section_feed(feed);275 } else {276 set_buf_flags(feed,277 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);278 dprintk_sect_loss("pusi not seen, discarding section data\n");279 }280 sec->secbufp += seclen; /* secbufp and secbuf moving together is */281 sec->secbuf += seclen; /* redundant but saves pointer arithmetic */282 }283 284 return 0;285}286 287static int dvb_dmx_swfilter_section_packet(struct dvb_demux_feed *feed,288 const u8 *buf)289{290 u8 p, count;291 int ccok, dc_i = 0;292 u8 cc;293 294 count = payload(buf);295 296 if (count == 0) /* count == 0 if no payload or out of range */297 return -1;298 299 p = 188 - count; /* payload start */300 301 cc = buf[3] & 0x0f;302 ccok = ((feed->cc + 1) & 0x0f) == cc;303 304 if (buf[3] & 0x20) {305 /* adaption field present, check for discontinuity_indicator */306 if ((buf[4] > 0) && (buf[5] & 0x80))307 dc_i = 1;308 }309 310 if (!ccok || dc_i) {311 if (dc_i) {312 set_buf_flags(feed,313 DMX_BUFFER_FLAG_DISCONTINUITY_INDICATOR);314 dprintk_sect_loss("%d frame with disconnect indicator\n",315 cc);316 } else {317 set_buf_flags(feed,318 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);319 dprintk_sect_loss("discontinuity: %d instead of %d. %d bytes lost\n",320 cc, (feed->cc + 1) & 0x0f, count + 4);321 }322 /*323 * those bytes under some circumstances will again be reported324 * in the following dvb_dmx_swfilter_section_new325 */326 327 /*328 * Discontinuity detected. Reset pusi_seen to329 * stop feeding of suspicious data until next PUSI=1 arrives330 *331 * FIXME: does it make sense if the MPEG-TS is the one332 * reporting discontinuity?333 */334 335 feed->pusi_seen = false;336 dvb_dmx_swfilter_section_new(feed);337 }338 feed->cc = cc;339 340 if (buf[1] & 0x40) {341 /* PUSI=1 (is set), section boundary is here */342 if (count > 1 && buf[p] < count) {343 const u8 *before = &buf[p + 1];344 u8 before_len = buf[p];345 const u8 *after = &before[before_len];346 u8 after_len = count - 1 - before_len;347 348 dvb_dmx_swfilter_section_copy_dump(feed, before,349 before_len);350 /* before start of new section, set pusi_seen */351 feed->pusi_seen = true;352 dvb_dmx_swfilter_section_new(feed);353 dvb_dmx_swfilter_section_copy_dump(feed, after,354 after_len);355 } else if (count > 0) {356 set_buf_flags(feed,357 DMX_BUFFER_FLAG_DISCONTINUITY_DETECTED);358 dprintk_sect_loss("PUSI=1 but %d bytes lost\n", count);359 }360 } else {361 /* PUSI=0 (is not set), no section boundary */362 dvb_dmx_swfilter_section_copy_dump(feed, &buf[p], count);363 }364 365 return 0;366}367 368static inline void dvb_dmx_swfilter_packet_type(struct dvb_demux_feed *feed,369 const u8 *buf)370{371 switch (feed->type) {372 case DMX_TYPE_TS:373 if (!feed->feed.ts.is_filtering)374 break;375 if (feed->ts_type & TS_PACKET) {376 if (feed->ts_type & TS_PAYLOAD_ONLY)377 dvb_dmx_swfilter_payload(feed, buf);378 else379 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,380 &feed->buffer_flags);381 }382 /* Used only on full-featured devices */383 if (feed->ts_type & TS_DECODER)384 if (feed->demux->write_to_decoder)385 feed->demux->write_to_decoder(feed, buf, 188);386 break;387 388 case DMX_TYPE_SEC:389 if (!feed->feed.sec.is_filtering)390 break;391 if (dvb_dmx_swfilter_section_packet(feed, buf) < 0)392 feed->feed.sec.seclen = feed->feed.sec.secbufp = 0;393 break;394 395 default:396 break;397 }398}399 400#define DVR_FEED(f) \401 (((f)->type == DMX_TYPE_TS) && \402 ((f)->feed.ts.is_filtering) && \403 (((f)->ts_type & (TS_PACKET | TS_DEMUX)) == TS_PACKET))404 405static void dvb_dmx_swfilter_packet(struct dvb_demux *demux, const u8 *buf)406{407 struct dvb_demux_feed *feed;408 u16 pid = ts_pid(buf);409 int dvr_done = 0;410 411 if (dvb_demux_speedcheck) {412 ktime_t cur_time;413 u64 speed_bytes, speed_timedelta;414 415 demux->speed_pkts_cnt++;416 417 /* show speed every SPEED_PKTS_INTERVAL packets */418 if (!(demux->speed_pkts_cnt % SPEED_PKTS_INTERVAL)) {419 cur_time = ktime_get();420 421 if (ktime_to_ns(demux->speed_last_time) != 0) {422 speed_bytes = (u64)demux->speed_pkts_cnt423 * 188 * 8;424 /* convert to 1024 basis */425 speed_bytes = 1000 * div64_u64(speed_bytes,426 1024);427 speed_timedelta = ktime_ms_delta(cur_time,428 demux->speed_last_time);429 if (speed_timedelta)430 dprintk("TS speed %llu Kbits/sec \n",431 div64_u64(speed_bytes,432 speed_timedelta));433 }434 435 demux->speed_last_time = cur_time;436 demux->speed_pkts_cnt = 0;437 }438 }439 440 if (buf[1] & 0x80) {441 list_for_each_entry(feed, &demux->feed_list, list_head) {442 if ((feed->pid != pid) && (feed->pid != 0x2000))443 continue;444 set_buf_flags(feed, DMX_BUFFER_FLAG_TEI);445 }446 dprintk_tscheck("TEI detected. PID=0x%x data1=0x%x\n",447 pid, buf[1]);448 /* data in this packet can't be trusted - drop it unless449 * module option dvb_demux_feed_err_pkts is set */450 if (!dvb_demux_feed_err_pkts)451 return;452 } else /* if TEI bit is set, pid may be wrong- skip pkt counter */453 if (demux->cnt_storage && dvb_demux_tscheck) {454 /* check pkt counter */455 if (pid < MAX_PID) {456 if (buf[3] & 0x10)457 demux->cnt_storage[pid] =458 (demux->cnt_storage[pid] + 1) & 0xf;459 460 if ((buf[3] & 0xf) != demux->cnt_storage[pid]) {461 list_for_each_entry(feed, &demux->feed_list, list_head) {462 if ((feed->pid != pid) && (feed->pid != 0x2000))463 continue;464 set_buf_flags(feed,465 DMX_BUFFER_PKT_COUNTER_MISMATCH);466 }467 468 dprintk_tscheck("TS packet counter mismatch. PID=0x%x expected 0x%x got 0x%x\n",469 pid, demux->cnt_storage[pid],470 buf[3] & 0xf);471 demux->cnt_storage[pid] = buf[3] & 0xf;472 }473 }474 /* end check */475 }476 477 list_for_each_entry(feed, &demux->feed_list, list_head) {478 if ((feed->pid != pid) && (feed->pid != 0x2000))479 continue;480 481 /* copy each packet only once to the dvr device, even482 * if a PID is in multiple filters (e.g. video + PCR) */483 if ((DVR_FEED(feed)) && (dvr_done++))484 continue;485 486 if (feed->pid == pid)487 dvb_dmx_swfilter_packet_type(feed, buf);488 else if (feed->pid == 0x2000)489 feed->cb.ts(buf, 188, NULL, 0, &feed->feed.ts,490 &feed->buffer_flags);491 }492}493 494void dvb_dmx_swfilter_packets(struct dvb_demux *demux, const u8 *buf,495 size_t count)496{497 unsigned long flags;498 499 spin_lock_irqsave(&demux->lock, flags);500 501 while (count--) {502 if (buf[0] == 0x47)503 dvb_dmx_swfilter_packet(demux, buf);504 buf += 188;505 }506 507 spin_unlock_irqrestore(&demux->lock, flags);508}509 510EXPORT_SYMBOL(dvb_dmx_swfilter_packets);511 512static inline int find_next_packet(const u8 *buf, int pos, size_t count,513 const int pktsize)514{515 int start = pos, lost;516 517 while (pos < count) {518 if (buf[pos] == 0x47 ||519 (pktsize == 204 && buf[pos] == 0xB8))520 break;521 pos++;522 }523 524 lost = pos - start;525 if (lost) {526 /* This garbage is part of a valid packet? */527 int backtrack = pos - pktsize;528 if (backtrack >= 0 && (buf[backtrack] == 0x47 ||529 (pktsize == 204 && buf[backtrack] == 0xB8)))530 return backtrack;531 }532 533 return pos;534}535 536/* Filter all pktsize= 188 or 204 sized packets and skip garbage. */537static inline void _dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf,538 size_t count, const int pktsize)539{540 int p = 0, i, j;541 const u8 *q;542 unsigned long flags;543 544 spin_lock_irqsave(&demux->lock, flags);545 546 if (demux->tsbufp) { /* tsbuf[0] is now 0x47. */547 i = demux->tsbufp;548 j = pktsize - i;549 if (count < j) {550 memcpy(&demux->tsbuf[i], buf, count);551 demux->tsbufp += count;552 goto bailout;553 }554 memcpy(&demux->tsbuf[i], buf, j);555 if (demux->tsbuf[0] == 0x47) /* double check */556 dvb_dmx_swfilter_packet(demux, demux->tsbuf);557 demux->tsbufp = 0;558 p += j;559 }560 561 while (1) {562 p = find_next_packet(buf, p, count, pktsize);563 if (p >= count)564 break;565 if (count - p < pktsize)566 break;567 568 q = &buf[p];569 570 if (pktsize == 204 && (*q == 0xB8)) {571 memcpy(demux->tsbuf, q, 188);572 demux->tsbuf[0] = 0x47;573 q = demux->tsbuf;574 }575 dvb_dmx_swfilter_packet(demux, q);576 p += pktsize;577 }578 579 i = count - p;580 if (i) {581 memcpy(demux->tsbuf, &buf[p], i);582 demux->tsbufp = i;583 if (pktsize == 204 && demux->tsbuf[0] == 0xB8)584 demux->tsbuf[0] = 0x47;585 }586 587bailout:588 spin_unlock_irqrestore(&demux->lock, flags);589}590 591void dvb_dmx_swfilter(struct dvb_demux *demux, const u8 *buf, size_t count)592{593 _dvb_dmx_swfilter(demux, buf, count, 188);594}595EXPORT_SYMBOL(dvb_dmx_swfilter);596 597void dvb_dmx_swfilter_204(struct dvb_demux *demux, const u8 *buf, size_t count)598{599 _dvb_dmx_swfilter(demux, buf, count, 204);600}601EXPORT_SYMBOL(dvb_dmx_swfilter_204);602 603void dvb_dmx_swfilter_raw(struct dvb_demux *demux, const u8 *buf, size_t count)604{605 unsigned long flags;606 607 spin_lock_irqsave(&demux->lock, flags);608 609 demux->feed->cb.ts(buf, count, NULL, 0, &demux->feed->feed.ts,610 &demux->feed->buffer_flags);611 612 spin_unlock_irqrestore(&demux->lock, flags);613}614EXPORT_SYMBOL(dvb_dmx_swfilter_raw);615 616static struct dvb_demux_filter *dvb_dmx_filter_alloc(struct dvb_demux *demux)617{618 int i;619 620 for (i = 0; i < demux->filternum; i++)621 if (demux->filter[i].state == DMX_STATE_FREE)622 break;623 624 if (i == demux->filternum)625 return NULL;626 627 demux->filter[i].state = DMX_STATE_ALLOCATED;628 629 return &demux->filter[i];630}631 632static struct dvb_demux_feed *dvb_dmx_feed_alloc(struct dvb_demux *demux)633{634 int i;635 636 for (i = 0; i < demux->feednum; i++)637 if (demux->feed[i].state == DMX_STATE_FREE)638 break;639 640 if (i == demux->feednum)641 return NULL;642 643 demux->feed[i].state = DMX_STATE_ALLOCATED;644 645 return &demux->feed[i];646}647 648static int dvb_demux_feed_find(struct dvb_demux_feed *feed)649{650 struct dvb_demux_feed *entry;651 652 list_for_each_entry(entry, &feed->demux->feed_list, list_head)653 if (entry == feed)654 return 1;655 656 return 0;657}658 659static void dvb_demux_feed_add(struct dvb_demux_feed *feed)660{661 spin_lock_irq(&feed->demux->lock);662 if (dvb_demux_feed_find(feed)) {663 pr_err("%s: feed already in list (type=%x state=%x pid=%x)\n",664 __func__, feed->type, feed->state, feed->pid);665 goto out;666 }667 668 list_add(&feed->list_head, &feed->demux->feed_list);669out:670 spin_unlock_irq(&feed->demux->lock);671}672 673static void dvb_demux_feed_del(struct dvb_demux_feed *feed)674{675 spin_lock_irq(&feed->demux->lock);676 if (!(dvb_demux_feed_find(feed))) {677 pr_err("%s: feed not in list (type=%x state=%x pid=%x)\n",678 __func__, feed->type, feed->state, feed->pid);679 goto out;680 }681 682 list_del(&feed->list_head);683out:684 spin_unlock_irq(&feed->demux->lock);685}686 687static int dmx_ts_feed_set(struct dmx_ts_feed *ts_feed, u16 pid, int ts_type,688 enum dmx_ts_pes pes_type, ktime_t timeout)689{690 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;691 struct dvb_demux *demux = feed->demux;692 693 if (pid > DMX_MAX_PID)694 return -EINVAL;695 696 if (mutex_lock_interruptible(&demux->mutex))697 return -ERESTARTSYS;698 699 if (ts_type & TS_DECODER) {700 if (pes_type >= DMX_PES_OTHER) {701 mutex_unlock(&demux->mutex);702 return -EINVAL;703 }704 705 if (demux->pesfilter[pes_type] &&706 demux->pesfilter[pes_type] != feed) {707 mutex_unlock(&demux->mutex);708 return -EINVAL;709 }710 711 demux->pesfilter[pes_type] = feed;712 demux->pids[pes_type] = pid;713 }714 715 dvb_demux_feed_add(feed);716 717 feed->pid = pid;718 feed->timeout = timeout;719 feed->ts_type = ts_type;720 feed->pes_type = pes_type;721 722 feed->state = DMX_STATE_READY;723 mutex_unlock(&demux->mutex);724 725 return 0;726}727 728static int dmx_ts_feed_start_filtering(struct dmx_ts_feed *ts_feed)729{730 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;731 struct dvb_demux *demux = feed->demux;732 int ret;733 734 if (mutex_lock_interruptible(&demux->mutex))735 return -ERESTARTSYS;736 737 if (feed->state != DMX_STATE_READY || feed->type != DMX_TYPE_TS) {738 mutex_unlock(&demux->mutex);739 return -EINVAL;740 }741 742 if (!demux->start_feed) {743 mutex_unlock(&demux->mutex);744 return -ENODEV;745 }746 747 if ((ret = demux->start_feed(feed)) < 0) {748 mutex_unlock(&demux->mutex);749 return ret;750 }751 752 spin_lock_irq(&demux->lock);753 ts_feed->is_filtering = 1;754 feed->state = DMX_STATE_GO;755 spin_unlock_irq(&demux->lock);756 mutex_unlock(&demux->mutex);757 758 return 0;759}760 761static int dmx_ts_feed_stop_filtering(struct dmx_ts_feed *ts_feed)762{763 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;764 struct dvb_demux *demux = feed->demux;765 int ret;766 767 mutex_lock(&demux->mutex);768 769 if (feed->state < DMX_STATE_GO) {770 mutex_unlock(&demux->mutex);771 return -EINVAL;772 }773 774 if (!demux->stop_feed) {775 mutex_unlock(&demux->mutex);776 return -ENODEV;777 }778 779 ret = demux->stop_feed(feed);780 781 spin_lock_irq(&demux->lock);782 ts_feed->is_filtering = 0;783 feed->state = DMX_STATE_ALLOCATED;784 spin_unlock_irq(&demux->lock);785 mutex_unlock(&demux->mutex);786 787 return ret;788}789 790static int dvbdmx_allocate_ts_feed(struct dmx_demux *dmx,791 struct dmx_ts_feed **ts_feed,792 dmx_ts_cb callback)793{794 struct dvb_demux *demux = (struct dvb_demux *)dmx;795 struct dvb_demux_feed *feed;796 797 if (mutex_lock_interruptible(&demux->mutex))798 return -ERESTARTSYS;799 800 if (!(feed = dvb_dmx_feed_alloc(demux))) {801 mutex_unlock(&demux->mutex);802 return -EBUSY;803 }804 805 feed->type = DMX_TYPE_TS;806 feed->cb.ts = callback;807 feed->demux = demux;808 feed->pid = 0xffff;809 feed->peslen = 0xfffa;810 feed->buffer_flags = 0;811 812 (*ts_feed) = &feed->feed.ts;813 (*ts_feed)->parent = dmx;814 (*ts_feed)->priv = NULL;815 (*ts_feed)->is_filtering = 0;816 (*ts_feed)->start_filtering = dmx_ts_feed_start_filtering;817 (*ts_feed)->stop_filtering = dmx_ts_feed_stop_filtering;818 (*ts_feed)->set = dmx_ts_feed_set;819 820 if (!(feed->filter = dvb_dmx_filter_alloc(demux))) {821 feed->state = DMX_STATE_FREE;822 mutex_unlock(&demux->mutex);823 return -EBUSY;824 }825 826 feed->filter->type = DMX_TYPE_TS;827 feed->filter->feed = feed;828 feed->filter->state = DMX_STATE_READY;829 830 mutex_unlock(&demux->mutex);831 832 return 0;833}834 835static int dvbdmx_release_ts_feed(struct dmx_demux *dmx,836 struct dmx_ts_feed *ts_feed)837{838 struct dvb_demux *demux = (struct dvb_demux *)dmx;839 struct dvb_demux_feed *feed = (struct dvb_demux_feed *)ts_feed;840 841 mutex_lock(&demux->mutex);842 843 if (feed->state == DMX_STATE_FREE) {844 mutex_unlock(&demux->mutex);845 return -EINVAL;846 }847 848 feed->state = DMX_STATE_FREE;849 feed->filter->state = DMX_STATE_FREE;850 851 dvb_demux_feed_del(feed);852 853 feed->pid = 0xffff;854 855 if (feed->ts_type & TS_DECODER && feed->pes_type < DMX_PES_OTHER)856 demux->pesfilter[feed->pes_type] = NULL;857 858 mutex_unlock(&demux->mutex);859 return 0;860}861 862/******************************************************************************863 * dmx_section_feed API calls864 ******************************************************************************/865 866static int dmx_section_feed_allocate_filter(struct dmx_section_feed *feed,867 struct dmx_section_filter **filter)868{869 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;870 struct dvb_demux *dvbdemux = dvbdmxfeed->demux;871 struct dvb_demux_filter *dvbdmxfilter;872 873 if (mutex_lock_interruptible(&dvbdemux->mutex))874 return -ERESTARTSYS;875 876 dvbdmxfilter = dvb_dmx_filter_alloc(dvbdemux);877 if (!dvbdmxfilter) {878 mutex_unlock(&dvbdemux->mutex);879 return -EBUSY;880 }881 882 spin_lock_irq(&dvbdemux->lock);883 *filter = &dvbdmxfilter->filter;884 (*filter)->parent = feed;885 (*filter)->priv = NULL;886 dvbdmxfilter->feed = dvbdmxfeed;887 dvbdmxfilter->type = DMX_TYPE_SEC;888 dvbdmxfilter->state = DMX_STATE_READY;889 dvbdmxfilter->next = dvbdmxfeed->filter;890 dvbdmxfeed->filter = dvbdmxfilter;891 spin_unlock_irq(&dvbdemux->lock);892 893 mutex_unlock(&dvbdemux->mutex);894 return 0;895}896 897static int dmx_section_feed_set(struct dmx_section_feed *feed,898 u16 pid, int check_crc)899{900 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;901 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;902 903 if (pid > 0x1fff)904 return -EINVAL;905 906 if (mutex_lock_interruptible(&dvbdmx->mutex))907 return -ERESTARTSYS;908 909 dvb_demux_feed_add(dvbdmxfeed);910 911 dvbdmxfeed->pid = pid;912 dvbdmxfeed->feed.sec.check_crc = check_crc;913 914 dvbdmxfeed->state = DMX_STATE_READY;915 mutex_unlock(&dvbdmx->mutex);916 return 0;917}918 919static void prepare_secfilters(struct dvb_demux_feed *dvbdmxfeed)920{921 int i;922 struct dvb_demux_filter *f;923 struct dmx_section_filter *sf;924 u8 mask, mode, doneq;925 926 if (!(f = dvbdmxfeed->filter))927 return;928 do {929 sf = &f->filter;930 doneq = false;931 for (i = 0; i < DVB_DEMUX_MASK_MAX; i++) {932 mode = sf->filter_mode[i];933 mask = sf->filter_mask[i];934 f->maskandmode[i] = mask & mode;935 doneq |= f->maskandnotmode[i] = mask & ~mode;936 }937 f->doneq = doneq ? true : false;938 } while ((f = f->next));939}940 941static int dmx_section_feed_start_filtering(struct dmx_section_feed *feed)942{943 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;944 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;945 int ret;946 947 if (mutex_lock_interruptible(&dvbdmx->mutex))948 return -ERESTARTSYS;949 950 if (feed->is_filtering) {951 mutex_unlock(&dvbdmx->mutex);952 return -EBUSY;953 }954 955 if (!dvbdmxfeed->filter) {956 mutex_unlock(&dvbdmx->mutex);957 return -EINVAL;958 }959 960 dvbdmxfeed->feed.sec.tsfeedp = 0;961 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;962 dvbdmxfeed->feed.sec.secbufp = 0;963 dvbdmxfeed->feed.sec.seclen = 0;964 dvbdmxfeed->pusi_seen = false;965 966 if (!dvbdmx->start_feed) {967 mutex_unlock(&dvbdmx->mutex);968 return -ENODEV;969 }970 971 prepare_secfilters(dvbdmxfeed);972 973 if ((ret = dvbdmx->start_feed(dvbdmxfeed)) < 0) {974 mutex_unlock(&dvbdmx->mutex);975 return ret;976 }977 978 spin_lock_irq(&dvbdmx->lock);979 feed->is_filtering = 1;980 dvbdmxfeed->state = DMX_STATE_GO;981 spin_unlock_irq(&dvbdmx->lock);982 983 mutex_unlock(&dvbdmx->mutex);984 return 0;985}986 987static int dmx_section_feed_stop_filtering(struct dmx_section_feed *feed)988{989 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;990 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;991 int ret;992 993 mutex_lock(&dvbdmx->mutex);994 995 if (!dvbdmx->stop_feed) {996 mutex_unlock(&dvbdmx->mutex);997 return -ENODEV;998 }999 1000 ret = dvbdmx->stop_feed(dvbdmxfeed);1001 1002 spin_lock_irq(&dvbdmx->lock);1003 dvbdmxfeed->state = DMX_STATE_READY;1004 feed->is_filtering = 0;1005 spin_unlock_irq(&dvbdmx->lock);1006 1007 mutex_unlock(&dvbdmx->mutex);1008 return ret;1009}1010 1011static int dmx_section_feed_release_filter(struct dmx_section_feed *feed,1012 struct dmx_section_filter *filter)1013{1014 struct dvb_demux_filter *dvbdmxfilter = (struct dvb_demux_filter *)filter, *f;1015 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;1016 struct dvb_demux *dvbdmx = dvbdmxfeed->demux;1017 1018 mutex_lock(&dvbdmx->mutex);1019 1020 if (dvbdmxfilter->feed != dvbdmxfeed) {1021 mutex_unlock(&dvbdmx->mutex);1022 return -EINVAL;1023 }1024 1025 if (feed->is_filtering) {1026 /* release dvbdmx->mutex as far as it is1027 acquired by stop_filtering() itself */1028 mutex_unlock(&dvbdmx->mutex);1029 feed->stop_filtering(feed);1030 mutex_lock(&dvbdmx->mutex);1031 }1032 1033 spin_lock_irq(&dvbdmx->lock);1034 f = dvbdmxfeed->filter;1035 1036 if (f == dvbdmxfilter) {1037 dvbdmxfeed->filter = dvbdmxfilter->next;1038 } else {1039 while (f->next != dvbdmxfilter)1040 f = f->next;1041 f->next = f->next->next;1042 }1043 1044 dvbdmxfilter->state = DMX_STATE_FREE;1045 spin_unlock_irq(&dvbdmx->lock);1046 mutex_unlock(&dvbdmx->mutex);1047 return 0;1048}1049 1050static int dvbdmx_allocate_section_feed(struct dmx_demux *demux,1051 struct dmx_section_feed **feed,1052 dmx_section_cb callback)1053{1054 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;1055 struct dvb_demux_feed *dvbdmxfeed;1056 1057 if (mutex_lock_interruptible(&dvbdmx->mutex))1058 return -ERESTARTSYS;1059 1060 if (!(dvbdmxfeed = dvb_dmx_feed_alloc(dvbdmx))) {1061 mutex_unlock(&dvbdmx->mutex);1062 return -EBUSY;1063 }1064 1065 dvbdmxfeed->type = DMX_TYPE_SEC;1066 dvbdmxfeed->cb.sec = callback;1067 dvbdmxfeed->demux = dvbdmx;1068 dvbdmxfeed->pid = 0xffff;1069 dvbdmxfeed->buffer_flags = 0;1070 dvbdmxfeed->feed.sec.secbuf = dvbdmxfeed->feed.sec.secbuf_base;1071 dvbdmxfeed->feed.sec.secbufp = dvbdmxfeed->feed.sec.seclen = 0;1072 dvbdmxfeed->feed.sec.tsfeedp = 0;1073 dvbdmxfeed->filter = NULL;1074 1075 (*feed) = &dvbdmxfeed->feed.sec;1076 (*feed)->is_filtering = 0;1077 (*feed)->parent = demux;1078 (*feed)->priv = NULL;1079 1080 (*feed)->set = dmx_section_feed_set;1081 (*feed)->allocate_filter = dmx_section_feed_allocate_filter;1082 (*feed)->start_filtering = dmx_section_feed_start_filtering;1083 (*feed)->stop_filtering = dmx_section_feed_stop_filtering;1084 (*feed)->release_filter = dmx_section_feed_release_filter;1085 1086 mutex_unlock(&dvbdmx->mutex);1087 return 0;1088}1089 1090static int dvbdmx_release_section_feed(struct dmx_demux *demux,1091 struct dmx_section_feed *feed)1092{1093 struct dvb_demux_feed *dvbdmxfeed = (struct dvb_demux_feed *)feed;1094 struct dvb_demux *dvbdmx = (struct dvb_demux *)demux;1095 1096 mutex_lock(&dvbdmx->mutex);1097 1098 if (dvbdmxfeed->state == DMX_STATE_FREE) {1099 mutex_unlock(&dvbdmx->mutex);1100 return -EINVAL;1101 }1102 dvbdmxfeed->state = DMX_STATE_FREE;1103 1104 dvb_demux_feed_del(dvbdmxfeed);1105 1106 dvbdmxfeed->pid = 0xffff;1107 1108 mutex_unlock(&dvbdmx->mutex);1109 return 0;1110}1111 1112/******************************************************************************1113 * dvb_demux kernel data API calls1114 ******************************************************************************/1115 1116static int dvbdmx_open(struct dmx_demux *demux)1117{1118 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1119 1120 if (dvbdemux->users >= MAX_DVB_DEMUX_USERS)1121 return -EUSERS;1122 1123 dvbdemux->users++;1124 return 0;1125}1126 1127static int dvbdmx_close(struct dmx_demux *demux)1128{1129 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1130 1131 if (dvbdemux->users == 0)1132 return -ENODEV;1133 1134 dvbdemux->users--;1135 //FIXME: release any unneeded resources if users==01136 return 0;1137}1138 1139static int dvbdmx_write(struct dmx_demux *demux, const char __user *buf, size_t count)1140{1141 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1142 void *p;1143 1144 if ((!demux->frontend) || (demux->frontend->source != DMX_MEMORY_FE))1145 return -EINVAL;1146 1147 p = memdup_user(buf, count);1148 if (IS_ERR(p))1149 return PTR_ERR(p);1150 if (mutex_lock_interruptible(&dvbdemux->mutex)) {1151 kfree(p);1152 return -ERESTARTSYS;1153 }1154 dvb_dmx_swfilter(dvbdemux, p, count);1155 kfree(p);1156 mutex_unlock(&dvbdemux->mutex);1157 1158 if (signal_pending(current))1159 return -EINTR;1160 return count;1161}1162 1163static int dvbdmx_add_frontend(struct dmx_demux *demux,1164 struct dmx_frontend *frontend)1165{1166 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1167 struct list_head *head = &dvbdemux->frontend_list;1168 1169 list_add(&(frontend->connectivity_list), head);1170 1171 return 0;1172}1173 1174static int dvbdmx_remove_frontend(struct dmx_demux *demux,1175 struct dmx_frontend *frontend)1176{1177 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1178 struct list_head *pos, *n, *head = &dvbdemux->frontend_list;1179 1180 list_for_each_safe(pos, n, head) {1181 if (DMX_FE_ENTRY(pos) == frontend) {1182 list_del(pos);1183 return 0;1184 }1185 }1186 1187 return -ENODEV;1188}1189 1190static struct list_head *dvbdmx_get_frontends(struct dmx_demux *demux)1191{1192 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1193 1194 if (list_empty(&dvbdemux->frontend_list))1195 return NULL;1196 1197 return &dvbdemux->frontend_list;1198}1199 1200static int dvbdmx_connect_frontend(struct dmx_demux *demux,1201 struct dmx_frontend *frontend)1202{1203 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1204 1205 if (demux->frontend)1206 return -EINVAL;1207 1208 mutex_lock(&dvbdemux->mutex);1209 1210 demux->frontend = frontend;1211 mutex_unlock(&dvbdemux->mutex);1212 return 0;1213}1214 1215static int dvbdmx_disconnect_frontend(struct dmx_demux *demux)1216{1217 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1218 1219 mutex_lock(&dvbdemux->mutex);1220 1221 demux->frontend = NULL;1222 mutex_unlock(&dvbdemux->mutex);1223 return 0;1224}1225 1226static int dvbdmx_get_pes_pids(struct dmx_demux *demux, u16 * pids)1227{1228 struct dvb_demux *dvbdemux = (struct dvb_demux *)demux;1229 1230 memcpy(pids, dvbdemux->pids, 5 * sizeof(u16));1231 return 0;1232}1233 1234int dvb_dmx_init(struct dvb_demux *dvbdemux)1235{1236 int i;1237 struct dmx_demux *dmx = &dvbdemux->dmx;1238 1239 dvbdemux->cnt_storage = NULL;1240 dvbdemux->users = 0;1241 dvbdemux->filter = vmalloc(array_size(sizeof(struct dvb_demux_filter),1242 dvbdemux->filternum));1243 1244 if (!dvbdemux->filter)1245 return -ENOMEM;1246 1247 dvbdemux->feed = vmalloc(array_size(sizeof(struct dvb_demux_feed),1248 dvbdemux->feednum));1249 if (!dvbdemux->feed) {1250 vfree(dvbdemux->filter);1251 dvbdemux->filter = NULL;1252 return -ENOMEM;1253 }1254 for (i = 0; i < dvbdemux->filternum; i++) {1255 dvbdemux->filter[i].state = DMX_STATE_FREE;1256 dvbdemux->filter[i].index = i;1257 }1258 for (i = 0; i < dvbdemux->feednum; i++) {1259 dvbdemux->feed[i].state = DMX_STATE_FREE;1260 dvbdemux->feed[i].index = i;1261 }1262 1263 dvbdemux->cnt_storage = vmalloc(MAX_PID + 1);1264 if (!dvbdemux->cnt_storage)1265 pr_warn("Couldn't allocate memory for TS/TEI check. Disabling it\n");1266 1267 INIT_LIST_HEAD(&dvbdemux->frontend_list);1268 1269 for (i = 0; i < DMX_PES_OTHER; i++) {1270 dvbdemux->pesfilter[i] = NULL;1271 dvbdemux->pids[i] = 0xffff;1272 }1273 1274 INIT_LIST_HEAD(&dvbdemux->feed_list);1275 1276 dvbdemux->playing = 0;1277 dvbdemux->recording = 0;1278 dvbdemux->tsbufp = 0;1279 1280 if (!dvbdemux->check_crc32)1281 dvbdemux->check_crc32 = dvb_dmx_crc32;1282 1283 if (!dvbdemux->memcopy)1284 dvbdemux->memcopy = dvb_dmx_memcopy;1285 1286 dmx->frontend = NULL;1287 dmx->priv = dvbdemux;1288 dmx->open = dvbdmx_open;1289 dmx->close = dvbdmx_close;1290 dmx->write = dvbdmx_write;1291 dmx->allocate_ts_feed = dvbdmx_allocate_ts_feed;1292 dmx->release_ts_feed = dvbdmx_release_ts_feed;1293 dmx->allocate_section_feed = dvbdmx_allocate_section_feed;1294 dmx->release_section_feed = dvbdmx_release_section_feed;1295 1296 dmx->add_frontend = dvbdmx_add_frontend;1297 dmx->remove_frontend = dvbdmx_remove_frontend;1298 dmx->get_frontends = dvbdmx_get_frontends;1299 dmx->connect_frontend = dvbdmx_connect_frontend;1300 dmx->disconnect_frontend = dvbdmx_disconnect_frontend;1301 dmx->get_pes_pids = dvbdmx_get_pes_pids;1302 1303 mutex_init(&dvbdemux->mutex);1304 spin_lock_init(&dvbdemux->lock);1305 1306 return 0;1307}1308 1309EXPORT_SYMBOL(dvb_dmx_init);1310 1311void dvb_dmx_release(struct dvb_demux *dvbdemux)1312{1313 vfree(dvbdemux->cnt_storage);1314 vfree(dvbdemux->filter);1315 vfree(dvbdemux->feed);1316}1317 1318EXPORT_SYMBOL(dvb_dmx_release);1319