drivers/media/dvb-core/dvb_net.c

   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  *
  27  * You should have received a copy of the GNU General Public License
  28  * along with this program; if not, write to the Free Software
  29  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  31  */
  32
  33 /*
  34  * ULE ChangeLog:
  35  * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
  36  *
  37  * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
  38  *                       ULE Extension header handling.
  39  *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
  40  *                       Fraunhofer Institute for Open Communication Systems
  41  *                       Competence Center for Advanced Satellite Communications.
  42  *                     Bugfixes and robustness improvements.
  43  *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
  44  *                     ULE_DEBUG compile-time option.
  45  * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
  46  *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
  47  *                       Paris Lodron University of Salzburg.
  48  */
  49
  50 /*
  51  * FIXME / TODO (dvb_net.c):
  52  *
  53  * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
  54  *
  55  */
  56
  57 #define pr_fmt(fmt) "dvb_net: " fmt
  58
  59 #include <linux/module.h>
  60 #include <linux/kernel.h>
  61 #include <linux/netdevice.h>
  62 #include <linux/etherdevice.h>
  63 #include <linux/dvb/net.h>
  64 #include <linux/uio.h>
  65 #include <linux/uaccess.h>
  66 #include <linux/crc32.h>
  67 #include <linux/mutex.h>
  68 #include <linux/sched.h>
  69
  70 #include "dvb_demux.h"
  71 #include "dvb_net.h"
  72
  73 static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
  74 {
  75         unsigned int j;
  76         for (j = 0; j < cnt; j++)
  77                 c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
  78         return c;
  79 }
  80
  81
  82 #define DVB_NET_MULTICAST_MAX 10
  83
  84 #undef ULE_DEBUG
  85
  86 #ifdef ULE_DEBUG
  87
  88 static void hexdump(const unsigned char *buf, unsigned short len)
  89 {
  90         print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  91 }
  92
  93 #endif
  94
  95 struct dvb_net_priv {
  96         int in_use;
  97         u16 pid;
  98         struct net_device *net;
  99         struct dvb_net *host;
 100         struct dmx_demux *demux;
 101         struct dmx_section_feed *secfeed;
 102         struct dmx_section_filter *secfilter;
 103         struct dmx_ts_feed *tsfeed;
 104         int multi_num;
 105         struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
 106         unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
 107         int rx_mode;
 108 #define RX_MODE_UNI 0
 109 #define RX_MODE_MULTI 1
 110 #define RX_MODE_ALL_MULTI 2
 111 #define RX_MODE_PROMISC 3
 112         struct work_struct set_multicast_list_wq;
 113         struct work_struct restart_net_feed_wq;
 114         unsigned char feedtype;                 /* Either FEED_TYPE_ or FEED_TYPE_ULE */
 115         int need_pusi;                          /* Set to 1, if synchronization on PUSI required. */
 116         unsigned char tscc;                     /* TS continuity counter after sync on PUSI. */
 117         struct sk_buff *ule_skb;                /* ULE SNDU decodes into this buffer. */
 118         unsigned char *ule_next_hdr;            /* Pointer into skb to next ULE extension header. */
 119         unsigned short ule_sndu_len;            /* ULE SNDU length in bytes, w/o D-Bit. */
 120         unsigned short ule_sndu_type;           /* ULE SNDU type field, complete. */
 121         unsigned char ule_sndu_type_1;          /* ULE SNDU type field, if split across 2 TS cells. */
 122         unsigned char ule_dbit;                 /* Whether the DestMAC address present
 123                                                  * or not (bit is set). */
 124         unsigned char ule_bridged;              /* Whether the ULE_BRIDGED extension header was found. */
 125         int ule_sndu_remain;                    /* Nr. of bytes still required for current ULE SNDU. */
 126         unsigned long ts_count;                 /* Current ts cell counter. */
 127         struct mutex mutex;
 128 };
 129
 130
 131 /**
 132  *      Determine the packet's protocol ID. The rule here is that we
 133  *      assume 802.3 if the type field is short enough to be a length.
 134  *      This is normal practice and works for any 'now in use' protocol.
 135  *
 136  *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 137  *  by Michael Holzt <kju@debian.org>
 138  */
 139 static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 140                                       struct net_device *dev)
 141 {
 142         struct ethhdr *eth;
 143         unsigned char *rawp;
 144
 145         skb_reset_mac_header(skb);
 146         skb_pull(skb,dev->hard_header_len);
 147         eth = eth_hdr(skb);
 148
 149         if (*eth->h_dest & 1) {
 150                 if(ether_addr_equal(eth->h_dest,dev->broadcast))
 151                         skb->pkt_type=PACKET_BROADCAST;
 152                 else
 153                         skb->pkt_type=PACKET_MULTICAST;
 154         }
 155
 156         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 157                 return eth->h_proto;
 158
 159         rawp = skb->data;
 160
 161         /**
 162          *      This is a magic hack to spot IPX packets. Older Novell breaks
 163          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
 164          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 165          *      won't work for fault tolerant netware but does for the rest.
 166          */
 167         if (*(unsigned short *)rawp == 0xFFFF)
 168                 return htons(ETH_P_802_3);
 169
 170         /**
 171          *      Real 802.2 LLC
 172          */
 173         return htons(ETH_P_802_2);
 174 }
 175
 176 #define TS_SZ   188
 177 #define TS_SYNC 0x47
 178 #define TS_TEI  0x80
 179 #define TS_SC   0xC0
 180 #define TS_PUSI 0x40
 181 #define TS_AF_A 0x20
 182 #define TS_AF_D 0x10
 183
 184 /* ULE Extension Header handlers. */
 185
 186 #define ULE_TEST        0
 187 #define ULE_BRIDGED     1
 188
 189 #define ULE_OPTEXTHDR_PADDING 0
 190
 191 static int ule_test_sndu( struct dvb_net_priv *p )
 192 {
 193         return -1;
 194 }
 195
 196 static int ule_bridged_sndu( struct dvb_net_priv *p )
 197 {
 198         struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
 199         if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 200                 int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
 201                 /* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 202                 if(framelen != ntohs(hdr->h_proto)) {
 203                         return -1;
 204                 }
 205         }
 206         /* Note:
 207          * From RFC4326:
 208          *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
 209          *   It must be the final (or only) extension header specified in the header chain of a SNDU."
 210          * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
 211          */
 212         p->ule_bridged = 1;
 213         return 0;
 214 }
 215
 216 static int ule_exthdr_padding(struct dvb_net_priv *p)
 217 {
 218         return 0;
 219 }
 220
 221 /** Handle ULE extension headers.
 222  *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 223  *  Returns: >= 0: nr. of bytes consumed by next extension header
 224  *           -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 225  */
 226 static int handle_one_ule_extension( struct dvb_net_priv *p )
 227 {
 228         /* Table of mandatory extension header handlers.  The header type is the index. */
 229         static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
 230                 { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
 231
 232         /* Table of optional extension header handlers.  The header type is the index. */
 233         static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
 234                 { [0] = ule_exthdr_padding, [1] = NULL, };
 235
 236         int ext_len = 0;
 237         unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
 238         unsigned char htype = p->ule_sndu_type & 0x00FF;
 239
 240         /* Discriminate mandatory and optional extension headers. */
 241         if (hlen == 0) {
 242                 /* Mandatory extension header */
 243                 if (ule_mandatory_ext_handlers[htype]) {
 244                         ext_len = ule_mandatory_ext_handlers[htype]( p );
 245                         if(ext_len >= 0) {
 246                                 p->ule_next_hdr += ext_len;
 247                                 if (!p->ule_bridged) {
 248                                         p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
 249                                         p->ule_next_hdr += 2;
 250                                 } else {
 251                                         p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
 252                                         /* This assures the extension handling loop will terminate. */
 253                                 }
 254                         }
 255                         // else: extension handler failed or SNDU should be discarded
 256                 } else
 257                         ext_len = -1;   /* SNDU has to be discarded. */
 258         } else {
 259                 /* Optional extension header.  Calculate the length. */
 260                 ext_len = hlen << 1;
 261                 /* Process the optional extension header according to its type. */
 262                 if (ule_optional_ext_handlers[htype])
 263                         (void)ule_optional_ext_handlers[htype]( p );
 264                 p->ule_next_hdr += ext_len;
 265                 p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
 266                 /*
 267                  * note: the length of the next header type is included in the
 268                  * length of THIS optional extension header
 269                  */
 270         }
 271
 272         return ext_len;
 273 }
 274
 275 static int handle_ule_extensions( struct dvb_net_priv *p )
 276 {
 277         int total_ext_len = 0, l;
 278
 279         p->ule_next_hdr = p->ule_skb->data;
 280         do {
 281                 l = handle_one_ule_extension( p );
 282                 if (l < 0)
 283                         return l;       /* Stop extension header processing and discard SNDU. */
 284                 total_ext_len += l;
 285 #ifdef ULE_DEBUG
 286                 pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
 287                          p->ule_next_hdr, (int)p->ule_sndu_type,
 288                          l, total_ext_len);
 289 #endif
 290
 291         } while (p->ule_sndu_type < ETH_P_802_3_MIN);
 292
 293         return total_ext_len;
 294 }
 295
 296
 297 /** Prepare for a new ULE SNDU: reset the decoder state. */
 298 static inline void reset_ule( struct dvb_net_priv *p )
 299 {
 300         p->ule_skb = NULL;
 301         p->ule_next_hdr = NULL;
 302         p->ule_sndu_len = 0;
 303         p->ule_sndu_type = 0;
 304         p->ule_sndu_type_1 = 0;
 305         p->ule_sndu_remain = 0;
 306         p->ule_dbit = 0xFF;
 307         p->ule_bridged = 0;
 308 }
 309
 310 /**
 311  * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 312  * TS cells of a single PID.
 313  */
 314
 315 struct dvb_net_ule_handle {
 316         struct net_device *dev;
 317         struct dvb_net_priv *priv;
 318         struct ethhdr *ethh;
 319         const u8 *buf;
 320         size_t buf_len;
 321         unsigned long skipped;
 322         const u8 *ts, *ts_end, *from_where;
 323         u8 ts_remain, how_much, new_ts;
 324         bool error;
 325 #ifdef ULE_DEBUG
 326         /*
 327          * The code inside ULE_DEBUG keeps a history of the
 328          * last 100 TS cells processed.
 329          */
 330         static unsigned char ule_hist[100*TS_SZ];
 331         static unsigned char *ule_where = ule_hist, ule_dump;
 332 #endif
 333 };
 334
 335 static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
 336 {
 337         /* We are about to process a new TS cell. */
 338
 339 #ifdef ULE_DEBUG
 340         if (h->ule_where >= &h->ule_hist[100*TS_SZ])
 341                 h->ule_where = h->ule_hist;
 342         memcpy(h->ule_where, h->ts, TS_SZ);
 343         if (h->ule_dump) {
 344                 hexdump(h->ule_where, TS_SZ);
 345                 h->ule_dump = 0;
 346         }
 347         h->ule_where += TS_SZ;
 348 #endif
 349
 350         /*
 351          * Check TS h->error conditions: sync_byte, transport_error_indicator,
 352          * scrambling_control .
 353          */
 354         if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
 355             ((h->ts[3] & TS_SC) != 0)) {
 356                 pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
 357                         h->priv->ts_count, h->ts[0],
 358                         (h->ts[1] & TS_TEI) >> 7,
 359                         (h->ts[3] & TS_SC) >> 6);
 360
 361                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 362                 if (h->priv->ule_skb) {
 363                         dev_kfree_skb(h->priv->ule_skb);
 364                         /* Prepare for next SNDU. */
 365                         h->dev->stats.rx_errors++;
 366                         h->dev->stats.rx_frame_errors++;
 367                 }
 368                 reset_ule(h->priv);
 369                 h->priv->need_pusi = 1;
 370
 371                 /* Continue with next TS cell. */
 372                 h->ts += TS_SZ;
 373                 h->priv->ts_count++;
 374                 return 1;
 375         }
 376
 377         h->ts_remain = 184;
 378         h->from_where = h->ts + 4;
 379
 380         return 0;
 381 }
 382
 383 static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
 384 {
 385         if (h->ts[1] & TS_PUSI) {
 386                 /* Find beginning of first ULE SNDU in current TS cell. */
 387                 /* Synchronize continuity counter. */
 388                 h->priv->tscc = h->ts[3] & 0x0F;
 389                 /* There is a pointer field here. */
 390                 if (h->ts[4] > h->ts_remain) {
 391                         pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
 392                                 h->priv->ts_count, h->ts[4]);
 393                         h->ts += TS_SZ;
 394                         h->priv->ts_count++;
 395                         return 1;
 396                 }
 397                 /* Skip to destination of pointer field. */
 398                 h->from_where = &h->ts[5] + h->ts[4];
 399                 h->ts_remain -= 1 + h->ts[4];
 400                 h->skipped = 0;
 401         } else {
 402                 h->skipped++;
 403                 h->ts += TS_SZ;
 404                 h->priv->ts_count++;
 405                 return 1;
 406         }
 407
 408         return 0;
 409 }
 410
 411 static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
 412 {
 413         /* Check continuity counter. */
 414         if ((h->ts[3] & 0x0F) == h->priv->tscc)
 415                 h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
 416         else {
 417                 /* TS discontinuity handling: */
 418                 pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
 419                         h->priv->ts_count, h->ts[3] & 0x0F,
 420                         h->priv->tscc);
 421                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 422                 if (h->priv->ule_skb) {
 423                         dev_kfree_skb(h->priv->ule_skb);
 424                         /* Prepare for next SNDU. */
 425                         // reset_ule(h->priv);  moved to below.
 426                         h->dev->stats.rx_errors++;
 427                         h->dev->stats.rx_frame_errors++;
 428                 }
 429                 reset_ule(h->priv);
 430                 /* skip to next PUSI. */
 431                 h->priv->need_pusi = 1;
 432                 return 1;
 433         }
 434         /*
 435          * If we still have an incomplete payload, but PUSI is
 436          * set; some TS cells are missing.
 437          * This is only possible here, if we missed exactly 16 TS
 438          * cells (continuity counter wrap).
 439          */
 440         if (h->ts[1] & TS_PUSI) {
 441                 if (!h->priv->need_pusi) {
 442                         if (!(*h->from_where < (h->ts_remain-1)) ||
 443                             *h->from_where != h->priv->ule_sndu_remain) {
 444                                 /*
 445                                  * Pointer field is invalid.
 446                                  * Drop this TS cell and any started ULE SNDU.
 447                                  */
 448                                 pr_warn("%lu: Invalid pointer field: %u.\n",
 449                                         h->priv->ts_count,
 450                                         *h->from_where);
 451
 452                                 /*
 453                                  * Drop partly decoded SNDU, reset state,
 454                                  * resync on PUSI.
 455                                  */
 456                                 if (h->priv->ule_skb) {
 457                                         h->error = true;
 458                                         dev_kfree_skb(h->priv->ule_skb);
 459                                 }
 460
 461                                 if (h->error || h->priv->ule_sndu_remain) {
 462                                         h->dev->stats.rx_errors++;
 463                                         h->dev->stats.rx_frame_errors++;
 464                                         h->error = false;
 465                                 }
 466
 467                                 reset_ule(h->priv);
 468                                 h->priv->need_pusi = 1;
 469                                 return 1;
 470                         }
 471                         /*
 472                          * Skip pointer field (we're processing a
 473                          * packed payload).
 474                          */
 475                         h->from_where += 1;
 476                         h->ts_remain -= 1;
 477                 } else
 478                         h->priv->need_pusi = 0;
 479
 480                 if (h->priv->ule_sndu_remain > 183) {
 481                         /*
 482                          * Current SNDU lacks more data than there
 483                          * could be available in the current TS cell.
 484                          */
 485                         h->dev->stats.rx_errors++;
 486                         h->dev->stats.rx_length_errors++;
 487                         pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d).  Flushing incomplete payload.\n",
 488                                 h->priv->ts_count,
 489                                 h->priv->ule_sndu_remain,
 490                                 h->ts[4], h->ts_remain);
 491                         dev_kfree_skb(h->priv->ule_skb);
 492                         /* Prepare for next SNDU. */
 493                         reset_ule(h->priv);
 494                         /*
 495                          * Resync: go to where pointer field points to:
 496                          * start of next ULE SNDU.
 497                          */
 498                         h->from_where += h->ts[4];
 499                         h->ts_remain -= h->ts[4];
 500                 }
 501         }
 502         return 0;
 503 }
 504
 505
 506 /*
 507  * Start a new payload with skb.
 508  * Find ULE header.  It is only guaranteed that the
 509  * length field (2 bytes) is contained in the current
 510  * TS.
 511  * Check h.ts_remain has to be >= 2 here.
 512  */
 513 static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
 514 {
 515         if (h->ts_remain < 2) {
 516                 pr_warn("Invalid payload packing: only %d bytes left in TS.  Resyncing.\n",
 517                         h->ts_remain);
 518                 h->priv->ule_sndu_len = 0;
 519                 h->priv->need_pusi = 1;
 520                 h->ts += TS_SZ;
 521                 return 1;
 522         }
 523
 524         if (!h->priv->ule_sndu_len) {
 525                 /* Got at least two bytes, thus extrace the SNDU length. */
 526                 h->priv->ule_sndu_len = h->from_where[0] << 8 |
 527                                         h->from_where[1];
 528                 if (h->priv->ule_sndu_len & 0x8000) {
 529                         /* D-Bit is set: no dest mac present. */
 530                         h->priv->ule_sndu_len &= 0x7FFF;
 531                         h->priv->ule_dbit = 1;
 532                 } else
 533                         h->priv->ule_dbit = 0;
 534
 535                 if (h->priv->ule_sndu_len < 5) {
 536                         pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
 537                                 h->priv->ts_count,
 538                                 h->priv->ule_sndu_len);
 539                         h->dev->stats.rx_errors++;
 540                         h->dev->stats.rx_length_errors++;
 541                         h->priv->ule_sndu_len = 0;
 542                         h->priv->need_pusi = 1;
 543                         h->new_ts = 1;
 544                         h->ts += TS_SZ;
 545                         h->priv->ts_count++;
 546                         return 1;
 547                 }
 548                 h->ts_remain -= 2;      /* consume the 2 bytes SNDU length. */
 549                 h->from_where += 2;
 550         }
 551
 552         h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
 553         /*
 554          * State of current TS:
 555          *   h->ts_remain (remaining bytes in the current TS cell)
 556          *   0  ule_type is not available now, we need the next TS cell
 557          *   1  the first byte of the ule_type is present
 558          * >=2  full ULE header present, maybe some payload data as well.
 559          */
 560         switch (h->ts_remain) {
 561         case 1:
 562                 h->priv->ule_sndu_remain--;
 563                 h->priv->ule_sndu_type = h->from_where[0] << 8;
 564
 565                 /* first byte of ule_type is set. */
 566                 h->priv->ule_sndu_type_1 = 1;
 567                 h->ts_remain -= 1;
 568                 h->from_where += 1;
 569                 /* fallthrough */
 570         case 0:
 571                 h->new_ts = 1;
 572                 h->ts += TS_SZ;
 573                 h->priv->ts_count++;
 574                 return 1;
 575
 576         default: /* complete ULE header is present in current TS. */
 577                 /* Extract ULE type field. */
 578                 if (h->priv->ule_sndu_type_1) {
 579                         h->priv->ule_sndu_type_1 = 0;
 580                         h->priv->ule_sndu_type |= h->from_where[0];
 581                         h->from_where += 1; /* points to payload start. */
 582                         h->ts_remain -= 1;
 583                 } else {
 584                         /* Complete type is present in new TS. */
 585                         h->priv->ule_sndu_type = h->from_where[0] << 8 |
 586                                                  h->from_where[1];
 587                         h->from_where += 2; /* points to payload start. */
 588                         h->ts_remain -= 2;
 589                 }
 590                 break;
 591         }
 592
 593         /*
 594          * Allocate the skb (decoder target buffer) with the correct size,
 595          * as follows:
 596          *
 597          * prepare for the largest case: bridged SNDU with MAC address
 598          * (dbit = 0).
 599          */
 600         h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
 601                                          ETH_HLEN + ETH_ALEN);
 602         if (!h->priv->ule_skb) {
 603                 pr_notice("%s: Memory squeeze, dropping packet.\n",
 604                           h->dev->name);
 605                 h->dev->stats.rx_dropped++;
 606                 return -1;
 607         }
 608
 609         /* This includes the CRC32 _and_ dest mac, if !dbit. */
 610         h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
 611         h->priv->ule_skb->dev = h->dev;
 612         /*
 613          * Leave space for Ethernet or bridged SNDU header
 614          * (eth hdr plus one MAC addr).
 615          */
 616         skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
 617
 618         return 0;
 619 }
 620
 621
 622 static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
 623 {
 624         static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
 625
 626         /*
 627          * The destination MAC address is the next data in the skb.  It comes
 628          * before any extension headers.
 629          *
 630          * Check if the payload of this SNDU should be passed up the stack.
 631          */
 632         if (h->priv->rx_mode == RX_MODE_PROMISC)
 633                 return 0;
 634
 635         if (h->priv->ule_skb->data[0] & 0x01) {
 636                 /* multicast or broadcast */
 637                 if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
 638                         /* multicast */
 639                         if (h->priv->rx_mode == RX_MODE_MULTI) {
 640                                 int i;
 641
 642                                 for (i = 0; i < h->priv->multi_num &&
 643                                      !ether_addr_equal(h->priv->ule_skb->data,
 644                                                        h->priv->multi_macs[i]);
 645                                      i++)
 646                                         ;
 647                                 if (i == h->priv->multi_num)
 648                                         return 1;
 649                         } else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
 650                                 return 1; /* no broadcast; */
 651                         /*
 652                          * else:
 653                          * all multicast mode: accept all multicast packets
 654                          */
 655                 }
 656                 /* else: broadcast */
 657         } else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
 658                 return 1;
 659
 660         return 0;
 661 }
 662
 663
 664 static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
 665                                   u32 ule_crc, u32 expected_crc)
 666 {
 667         u8 dest_addr[ETH_ALEN];
 668
 669         if (ule_crc != expected_crc) {
 670                 pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
 671                         h->priv->ts_count, ule_crc, expected_crc,
 672                         h->priv->ule_sndu_len, h->priv->ule_sndu_type,
 673                         h->ts_remain,
 674                         h->ts_remain > 2 ?
 675                                 *(unsigned short *)h->from_where : 0);
 676
 677         #ifdef ULE_DEBUG
 678                 hexdump(iov[0].iov_base, iov[0].iov_len);
 679                 hexdump(iov[1].iov_base, iov[1].iov_len);
 680                 hexdump(iov[2].iov_base, iov[2].iov_len);
 681
 682                 if (h->ule_where == h->ule_hist) {
 683                         hexdump(&h->ule_hist[98*TS_SZ], TS_SZ);
 684                         hexdump(&h->ule_hist[99*TS_SZ], TS_SZ);
 685                 } else if (h->ule_where == &h->ule_hist[TS_SZ]) {
 686                         hexdump(&h->ule_hist[99*TS_SZ], TS_SZ);
 687                         hexdump(h->ule_hist, TS_SZ);
 688                 } else {
 689                         hexdump(h->ule_where - TS_SZ - TS_SZ, TS_SZ);
 690                         hexdump(h->ule_where - TS_SZ, TS_SZ);
 691                 }
 692                 h->ule_dump = 1;
 693         #endif
 694
 695                 h->dev->stats.rx_errors++;
 696                 h->dev->stats.rx_crc_errors++;
 697                 dev_kfree_skb(h->priv->ule_skb);
 698
 699                 return;
 700         }
 701
 702         /* CRC32 verified OK. */
 703
 704         /* CRC32 was OK, so remove it from skb. */
 705         h->priv->ule_skb->tail -= 4;
 706         h->priv->ule_skb->len -= 4;
 707
 708         if (!h->priv->ule_dbit) {
 709                 if (dvb_net_ule_should_drop(h)) {
 710 #ifdef ULE_DEBUG
 711                         netdev_dbg(h->dev,
 712                                    "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
 713                                    h->priv->ule_skb->data, h->dev->dev_addr);
 714 #endif
 715                         dev_kfree_skb(h->priv->ule_skb);
 716                         return;
 717                 }
 718
 719                 skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
 720                                           ETH_ALEN);
 721                 skb_pull(h->priv->ule_skb, ETH_ALEN);
 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                 if (!h->priv->ule_dbit) {
 754                         /*
 755                          * dest_addr buffer is only valid if
 756                          * h->priv->ule_dbit == 0
 757                          */
 758                         memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
 759                         eth_zero_addr(h->ethh->h_source);
 760                 } else /* zeroize source and dest */
 761                         memset(h->ethh, 0, ETH_ALEN * 2);
 762
 763                 h->ethh->h_proto = htons(h->priv->ule_sndu_type);
 764         }
 765         /* else:  skb is in correct state; nothing to do. */
 766         h->priv->ule_bridged = 0;
 767
 768         /* Stuff into kernel's protocol stack. */
 769         h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
 770                                                            h->dev);
 771         /*
 772          * If D-bit is set (i.e. destination MAC address not present),
 773          * receive the packet anyhow.
 774          */
 775 #if 0
 776         if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
 777                 h->priv->ule_skb->pkt_type = PACKET_HOST;
 778 #endif
 779         h->dev->stats.rx_packets++;
 780         h->dev->stats.rx_bytes += h->priv->ule_skb->len;
 781         netif_rx(h->priv->ule_skb);
 782 }
 783
 784 static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
 785 {
 786         int ret;
 787         struct dvb_net_ule_handle h = {
 788                 .dev = dev,
 789                 .buf = buf,
 790                 .buf_len = buf_len,
 791                 .skipped = 0L,
 792                 .ts = NULL,
 793                 .ts_end = NULL,
 794                 .from_where = NULL,
 795                 .ts_remain = 0,
 796                 .how_much = 0,
 797                 .new_ts = 1,
 798                 .ethh = NULL,
 799                 .error = false,
 800 #ifdef ULE_DEBUG
 801                 .ule_where = ule_hist,
 802 #endif
 803         };
 804
 805         /*
 806          * For all TS cells in current buffer.
 807          * Appearently, we are called for every single TS cell.
 808          */
 809         for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
 810              h.ts < h.ts_end; /* no incr. */) {
 811                 if (h.new_ts) {
 812                         /* We are about to process a new TS cell. */
 813                         if (dvb_net_ule_new_ts_cell(&h))
 814                                 continue;
 815                 }
 816
 817                 /* Synchronize on PUSI, if required. */
 818                 if (h.priv->need_pusi) {
 819                         if (dvb_net_ule_ts_pusi(&h))
 820                                 continue;
 821                 }
 822
 823                 if (h.new_ts) {
 824                         if (dvb_net_ule_new_ts(&h))
 825                                 continue;
 826                 }
 827
 828                 /* Check if new payload needs to be started. */
 829                 if (h.priv->ule_skb == NULL) {
 830                         ret = dvb_net_ule_new_payload(&h);
 831                         if (ret < 0)
 832                                 return;
 833                         if (ret)
 834                                 continue;
 835                 }
 836
 837                 /* Copy data into our current skb. */
 838                 h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
 839                 memcpy(skb_put(h.priv->ule_skb, h.how_much),
 840                        h.from_where, h.how_much);
 841                 h.priv->ule_sndu_remain -= h.how_much;
 842                 h.ts_remain -= h.how_much;
 843                 h.from_where += h.how_much;
 844
 845                 /* Check for complete payload. */
 846                 if (h.priv->ule_sndu_remain <= 0) {
 847                         /* Check CRC32, we've got it in our skb already. */
 848                         __be16 ulen = htons(h.priv->ule_sndu_len);
 849                         __be16 utype = htons(h.priv->ule_sndu_type);
 850                         const u8 *tail;
 851                         struct kvec iov[3] = {
 852                                 { &ulen, sizeof ulen },
 853                                 { &utype, sizeof utype },
 854                                 { h.priv->ule_skb->data,
 855                                   h.priv->ule_skb->len - 4 }
 856                         };
 857                         u32 ule_crc = ~0L, expected_crc;
 858                         if (h.priv->ule_dbit) {
 859                                 /* Set D-bit for CRC32 verification,
 860                                  * if it was set originally. */
 861                                 ulen |= htons(0x8000);
 862                         }
 863
 864                         ule_crc = iov_crc32(ule_crc, iov, 3);
 865                         tail = skb_tail_pointer(h.priv->ule_skb);
 866                         expected_crc = *(tail - 4) << 24 |
 867                                        *(tail - 3) << 16 |
 868                                        *(tail - 2) << 8 |
 869                                        *(tail - 1);
 870
 871                         dvb_net_ule_check_crc(&h, ule_crc, expected_crc);
 872
 873                         /* Prepare for next SNDU. */
 874                         reset_ule(h.priv);
 875                 }
 876
 877                 /* More data in current TS (look at the bytes following the CRC32)? */
 878                 if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
 879                         /* Next ULE SNDU starts right there. */
 880                         h.new_ts = 0;
 881                         h.priv->ule_skb = NULL;
 882                         h.priv->ule_sndu_type_1 = 0;
 883                         h.priv->ule_sndu_len = 0;
 884                         // pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
 885                         //      *(h.from_where + 0), *(h.from_where + 1),
 886                         //      *(h.from_where + 2), *(h.from_where + 3));
 887                         // pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
 888                         // hexdump(h.ts, 188);
 889                 } else {
 890                         h.new_ts = 1;
 891                         h.ts += TS_SZ;
 892                         h.priv->ts_count++;
 893                         if (h.priv->ule_skb == NULL) {
 894                                 h.priv->need_pusi = 1;
 895                                 h.priv->ule_sndu_type_1 = 0;
 896                                 h.priv->ule_sndu_len = 0;
 897                         }
 898                 }
 899         }       /* for all available TS cells */
 900 }
 901
 902 static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
 903                                const u8 *buffer2, size_t buffer2_len,
 904                                struct dmx_ts_feed *feed)
 905 {
 906         struct net_device *dev = feed->priv;
 907
 908         if (buffer2)
 909                 pr_warn("buffer2 not NULL: %p.\n", buffer2);
 910         if (buffer1_len > 32768)
 911                 pr_warn("length > 32k: %zu.\n", buffer1_len);
 912         /* pr_info("TS callback: %u bytes, %u TS cells @ %p.\n",
 913                   buffer1_len, buffer1_len / TS_SZ, buffer1); */
 914         dvb_net_ule(dev, buffer1, buffer1_len);
 915         return 0;
 916 }
 917
 918
 919 static void dvb_net_sec(struct net_device *dev,
 920                         const u8 *pkt, int pkt_len)
 921 {
 922         u8 *eth;
 923         struct sk_buff *skb;
 924         struct net_device_stats *stats = &dev->stats;
 925         int snap = 0;
 926
 927         /* note: pkt_len includes a 32bit checksum */
 928         if (pkt_len < 16) {
 929                 pr_warn("%s: IP/MPE packet length = %d too small.\n",
 930                         dev->name, pkt_len);
 931                 stats->rx_errors++;
 932                 stats->rx_length_errors++;
 933                 return;
 934         }
 935 /* it seems some ISPs manage to screw up here, so we have to
 936  * relax the error checks... */
 937 #if 0
 938         if ((pkt[5] & 0xfd) != 0xc1) {
 939                 /* drop scrambled or broken packets */
 940 #else
 941         if ((pkt[5] & 0x3c) != 0x00) {
 942                 /* drop scrambled */
 943 #endif
 944                 stats->rx_errors++;
 945                 stats->rx_crc_errors++;
 946                 return;
 947         }
 948         if (pkt[5] & 0x02) {
 949                 /* handle LLC/SNAP, see rfc-1042 */
 950                 if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
 951                         stats->rx_dropped++;
 952                         return;
 953                 }
 954                 snap = 8;
 955         }
 956         if (pkt[7]) {
 957                 /* FIXME: assemble datagram from multiple sections */
 958                 stats->rx_errors++;
 959                 stats->rx_frame_errors++;
 960                 return;
 961         }
 962
 963         /* we have 14 byte ethernet header (ip header follows);
 964          * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
 965          */
 966         if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
 967                 //pr_notice("%s: Memory squeeze, dropping packet.\n", dev->name);
 968                 stats->rx_dropped++;
 969                 return;
 970         }
 971         skb_reserve(skb, 2);    /* longword align L3 header */
 972         skb->dev = dev;
 973
 974         /* copy L3 payload */
 975         eth = (u8 *) skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
 976         memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
 977
 978         /* create ethernet header: */
 979         eth[0]=pkt[0x0b];
 980         eth[1]=pkt[0x0a];
 981         eth[2]=pkt[0x09];
 982         eth[3]=pkt[0x08];
 983         eth[4]=pkt[0x04];
 984         eth[5]=pkt[0x03];
 985
 986         eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
 987
 988         if (snap) {
 989                 eth[12] = pkt[18];
 990                 eth[13] = pkt[19];
 991         } else {
 992                 /* protocol numbers are from rfc-1700 or
 993                  * http://www.iana.org/assignments/ethernet-numbers
 994                  */
 995                 if (pkt[12] >> 4 == 6) { /* version field from IP header */
 996                         eth[12] = 0x86; /* IPv6 */
 997                         eth[13] = 0xdd;
 998                 } else {
 999                         eth[12] = 0x08; /* IPv4 */
1000                         eth[13] = 0x00;
1001                 }
1002         }
1003
1004         skb->protocol = dvb_net_eth_type_trans(skb, dev);
1005
1006         stats->rx_packets++;
1007         stats->rx_bytes+=skb->len;
1008         netif_rx(skb);
1009 }
1010
1011 static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
1012                  const u8 *buffer2, size_t buffer2_len,
1013                  struct dmx_section_filter *filter)
1014 {
1015         struct net_device *dev = filter->priv;
1016
1017         /**
1018          * we rely on the DVB API definition where exactly one complete
1019          * section is delivered in buffer1
1020          */
1021         dvb_net_sec (dev, buffer1, buffer1_len);
1022         return 0;
1023 }
1024
1025 static int dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
1026 {
1027         dev_kfree_skb(skb);
1028         return NETDEV_TX_OK;
1029 }
1030
1031 static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1032 static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
1033 static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
1034 static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1035
1036 static int dvb_net_filter_sec_set(struct net_device *dev,
1037                    struct dmx_section_filter **secfilter,
1038                    u8 *mac, u8 *mac_mask)
1039 {
1040         struct dvb_net_priv *priv = netdev_priv(dev);
1041         int ret;
1042
1043         *secfilter=NULL;
1044         ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
1045         if (ret<0) {
1046                 pr_err("%s: could not get filter\n", dev->name);
1047                 return ret;
1048         }
1049
1050         (*secfilter)->priv=(void *) dev;
1051
1052         memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
1053         memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
1054         memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
1055
1056         (*secfilter)->filter_value[0]=0x3e;
1057         (*secfilter)->filter_value[3]=mac[5];
1058         (*secfilter)->filter_value[4]=mac[4];
1059         (*secfilter)->filter_value[8]=mac[3];
1060         (*secfilter)->filter_value[9]=mac[2];
1061         (*secfilter)->filter_value[10]=mac[1];
1062         (*secfilter)->filter_value[11]=mac[0];
1063
1064         (*secfilter)->filter_mask[0] = 0xff;
1065         (*secfilter)->filter_mask[3] = mac_mask[5];
1066         (*secfilter)->filter_mask[4] = mac_mask[4];
1067         (*secfilter)->filter_mask[8] = mac_mask[3];
1068         (*secfilter)->filter_mask[9] = mac_mask[2];
1069         (*secfilter)->filter_mask[10] = mac_mask[1];
1070         (*secfilter)->filter_mask[11]=mac_mask[0];
1071
1072         netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
1073
1074         return 0;
1075 }
1076
1077 static int dvb_net_feed_start(struct net_device *dev)
1078 {
1079         int ret = 0, i;
1080         struct dvb_net_priv *priv = netdev_priv(dev);
1081         struct dmx_demux *demux = priv->demux;
1082         unsigned char *mac = (unsigned char *) dev->dev_addr;
1083
1084         netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
1085         mutex_lock(&priv->mutex);
1086         if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
1087                 pr_err("%s: BUG %d\n", __func__, __LINE__);
1088
1089         priv->secfeed=NULL;
1090         priv->secfilter=NULL;
1091         priv->tsfeed = NULL;
1092
1093         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1094                 netdev_dbg(dev, "alloc secfeed\n");
1095                 ret=demux->allocate_section_feed(demux, &priv->secfeed,
1096                                          dvb_net_sec_callback);
1097                 if (ret<0) {
1098                         pr_err("%s: could not allocate section feed\n",
1099                                dev->name);
1100                         goto error;
1101                 }
1102
1103                 ret = priv->secfeed->set(priv->secfeed, priv->pid, 1);
1104
1105                 if (ret<0) {
1106                         pr_err("%s: could not set section feed\n", dev->name);
1107                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1108                         priv->secfeed=NULL;
1109                         goto error;
1110                 }
1111
1112                 if (priv->rx_mode != RX_MODE_PROMISC) {
1113                         netdev_dbg(dev, "set secfilter\n");
1114                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
1115                 }
1116
1117                 switch (priv->rx_mode) {
1118                 case RX_MODE_MULTI:
1119                         for (i = 0; i < priv->multi_num; i++) {
1120                                 netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
1121                                 dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
1122                                                        priv->multi_macs[i], mask_normal);
1123                         }
1124                         break;
1125                 case RX_MODE_ALL_MULTI:
1126                         priv->multi_num=1;
1127                         netdev_dbg(dev, "set multi_secfilter[0]\n");
1128                         dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
1129                                                mac_allmulti, mask_allmulti);
1130                         break;
1131                 case RX_MODE_PROMISC:
1132                         priv->multi_num=0;
1133                         netdev_dbg(dev, "set secfilter\n");
1134                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
1135                         break;
1136                 }
1137
1138                 netdev_dbg(dev, "start filtering\n");
1139                 priv->secfeed->start_filtering(priv->secfeed);
1140         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1141                 ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
1142
1143                 /* we have payloads encapsulated in TS */
1144                 netdev_dbg(dev, "alloc tsfeed\n");
1145                 ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1146                 if (ret < 0) {
1147                         pr_err("%s: could not allocate ts feed\n", dev->name);
1148                         goto error;
1149                 }
1150
1151                 /* Set netdevice pointer for ts decaps callback. */
1152                 priv->tsfeed->priv = (void *)dev;
1153                 ret = priv->tsfeed->set(priv->tsfeed,
1154                                         priv->pid, /* pid */
1155                                         TS_PACKET, /* type */
1156                                         DMX_PES_OTHER, /* pes type */
1157                                         timeout    /* timeout */
1158                                         );
1159
1160                 if (ret < 0) {
1161                         pr_err("%s: could not set ts feed\n", dev->name);
1162                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1163                         priv->tsfeed = NULL;
1164                         goto error;
1165                 }
1166
1167                 netdev_dbg(dev, "start filtering\n");
1168                 priv->tsfeed->start_filtering(priv->tsfeed);
1169         } else
1170                 ret = -EINVAL;
1171
1172 error:
1173         mutex_unlock(&priv->mutex);
1174         return ret;
1175 }
1176
1177 static int dvb_net_feed_stop(struct net_device *dev)
1178 {
1179         struct dvb_net_priv *priv = netdev_priv(dev);
1180         int i, ret = 0;
1181
1182         mutex_lock(&priv->mutex);
1183         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1184                 if (priv->secfeed) {
1185                         if (priv->secfeed->is_filtering) {
1186                                 netdev_dbg(dev, "stop secfeed\n");
1187                                 priv->secfeed->stop_filtering(priv->secfeed);
1188                         }
1189
1190                         if (priv->secfilter) {
1191                                 netdev_dbg(dev, "release secfilter\n");
1192                                 priv->secfeed->release_filter(priv->secfeed,
1193                                                               priv->secfilter);
1194                                 priv->secfilter=NULL;
1195                         }
1196
1197                         for (i=0; i<priv->multi_num; i++) {
1198                                 if (priv->multi_secfilter[i]) {
1199                                         netdev_dbg(dev, "release multi_filter[%d]\n",
1200                                                    i);
1201                                         priv->secfeed->release_filter(priv->secfeed,
1202                                                                       priv->multi_secfilter[i]);
1203                                         priv->multi_secfilter[i] = NULL;
1204                                 }
1205                         }
1206
1207                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1208                         priv->secfeed = NULL;
1209                 } else
1210                         pr_err("%s: no feed to stop\n", dev->name);
1211         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1212                 if (priv->tsfeed) {
1213                         if (priv->tsfeed->is_filtering) {
1214                                 netdev_dbg(dev, "stop tsfeed\n");
1215                                 priv->tsfeed->stop_filtering(priv->tsfeed);
1216                         }
1217                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1218                         priv->tsfeed = NULL;
1219                 }
1220                 else
1221                         pr_err("%s: no ts feed to stop\n", dev->name);
1222         } else
1223                 ret = -EINVAL;
1224         mutex_unlock(&priv->mutex);
1225         return ret;
1226 }
1227
1228
1229 static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1230 {
1231         struct dvb_net_priv *priv = netdev_priv(dev);
1232
1233         if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1234                 return -ENOMEM;
1235
1236         memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1237
1238         priv->multi_num++;
1239         return 0;
1240 }
1241
1242
1243 static void wq_set_multicast_list (struct work_struct *work)
1244 {
1245         struct dvb_net_priv *priv =
1246                 container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1247         struct net_device *dev = priv->net;
1248
1249         dvb_net_feed_stop(dev);
1250         priv->rx_mode = RX_MODE_UNI;
1251         netif_addr_lock_bh(dev);
1252
1253         if (dev->flags & IFF_PROMISC) {
1254                 netdev_dbg(dev, "promiscuous mode\n");
1255                 priv->rx_mode = RX_MODE_PROMISC;
1256         } else if ((dev->flags & IFF_ALLMULTI)) {
1257                 netdev_dbg(dev, "allmulti mode\n");
1258                 priv->rx_mode = RX_MODE_ALL_MULTI;
1259         } else if (!netdev_mc_empty(dev)) {
1260                 struct netdev_hw_addr *ha;
1261
1262                 netdev_dbg(dev, "set_mc_list, %d entries\n",
1263                            netdev_mc_count(dev));
1264
1265                 priv->rx_mode = RX_MODE_MULTI;
1266                 priv->multi_num = 0;
1267
1268                 netdev_for_each_mc_addr(ha, dev)
1269                         dvb_set_mc_filter(dev, ha->addr);
1270         }
1271
1272         netif_addr_unlock_bh(dev);
1273         dvb_net_feed_start(dev);
1274 }
1275
1276
1277 static void dvb_net_set_multicast_list (struct net_device *dev)
1278 {
1279         struct dvb_net_priv *priv = netdev_priv(dev);
1280         schedule_work(&priv->set_multicast_list_wq);
1281 }
1282
1283
1284 static void wq_restart_net_feed (struct work_struct *work)
1285 {
1286         struct dvb_net_priv *priv =
1287                 container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1288         struct net_device *dev = priv->net;
1289
1290         if (netif_running(dev)) {
1291                 dvb_net_feed_stop(dev);
1292                 dvb_net_feed_start(dev);
1293         }
1294 }
1295
1296
1297 static int dvb_net_set_mac (struct net_device *dev, void *p)
1298 {
1299         struct dvb_net_priv *priv = netdev_priv(dev);
1300         struct sockaddr *addr=p;
1301
1302         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1303
1304         if (netif_running(dev))
1305                 schedule_work(&priv->restart_net_feed_wq);
1306
1307         return 0;
1308 }
1309
1310
1311 static int dvb_net_open(struct net_device *dev)
1312 {
1313         struct dvb_net_priv *priv = netdev_priv(dev);
1314
1315         priv->in_use++;
1316         dvb_net_feed_start(dev);
1317         return 0;
1318 }
1319
1320
1321 static int dvb_net_stop(struct net_device *dev)
1322 {
1323         struct dvb_net_priv *priv = netdev_priv(dev);
1324
1325         priv->in_use--;
1326         return dvb_net_feed_stop(dev);
1327 }
1328
1329 static const struct header_ops dvb_header_ops = {
1330         .create         = eth_header,
1331         .parse          = eth_header_parse,
1332 };
1333
1334
1335 static const struct net_device_ops dvb_netdev_ops = {
1336         .ndo_open               = dvb_net_open,
1337         .ndo_stop               = dvb_net_stop,
1338         .ndo_start_xmit         = dvb_net_tx,
1339         .ndo_set_rx_mode        = dvb_net_set_multicast_list,
1340         .ndo_set_mac_address    = dvb_net_set_mac,
1341         .ndo_validate_addr      = eth_validate_addr,
1342 };
1343
1344 static void dvb_net_setup(struct net_device *dev)
1345 {
1346         ether_setup(dev);
1347
1348         dev->header_ops         = &dvb_header_ops;
1349         dev->netdev_ops         = &dvb_netdev_ops;
1350         dev->mtu                = 4096;
1351         dev->max_mtu            = 4096;
1352
1353         dev->flags |= IFF_NOARP;
1354 }
1355
1356 static int get_if(struct dvb_net *dvbnet)
1357 {
1358         int i;
1359
1360         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1361                 if (!dvbnet->state[i])
1362                         break;
1363
1364         if (i == DVB_NET_DEVICES_MAX)
1365                 return -1;
1366
1367         dvbnet->state[i]=1;
1368         return i;
1369 }
1370
1371 static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1372 {
1373         struct net_device *net;
1374         struct dvb_net_priv *priv;
1375         int result;
1376         int if_num;
1377
1378         if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1379                 return -EINVAL;
1380         if ((if_num = get_if(dvbnet)) < 0)
1381                 return -EINVAL;
1382
1383         net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1384                            NET_NAME_UNKNOWN, dvb_net_setup);
1385         if (!net)
1386                 return -ENOMEM;
1387
1388         if (dvbnet->dvbdev->id)
1389                 snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1390                          dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1391         else
1392                 /* compatibility fix to keep dvb0_0 format */
1393                 snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1394                          dvbnet->dvbdev->adapter->num, if_num);
1395
1396         net->addr_len = 6;
1397         memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
1398
1399         dvbnet->device[if_num] = net;
1400
1401         priv = netdev_priv(net);
1402         priv->net = net;
1403         priv->demux = dvbnet->demux;
1404         priv->pid = pid;
1405         priv->rx_mode = RX_MODE_UNI;
1406         priv->need_pusi = 1;
1407         priv->tscc = 0;
1408         priv->feedtype = feedtype;
1409         reset_ule(priv);
1410
1411         INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1412         INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1413         mutex_init(&priv->mutex);
1414
1415         net->base_addr = pid;
1416
1417         if ((result = register_netdev(net)) < 0) {
1418                 dvbnet->device[if_num] = NULL;
1419                 free_netdev(net);
1420                 return result;
1421         }
1422         pr_info("created network interface %s\n", net->name);
1423
1424         return if_num;
1425 }
1426
1427 static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1428 {
1429         struct net_device *net = dvbnet->device[num];
1430         struct dvb_net_priv *priv;
1431
1432         if (!dvbnet->state[num])
1433                 return -EINVAL;
1434         priv = netdev_priv(net);
1435         if (priv->in_use)
1436                 return -EBUSY;
1437
1438         dvb_net_stop(net);
1439         flush_work(&priv->set_multicast_list_wq);
1440         flush_work(&priv->restart_net_feed_wq);
1441         pr_info("removed network interface %s\n", net->name);
1442         unregister_netdev(net);
1443         dvbnet->state[num]=0;
1444         dvbnet->device[num] = NULL;
1445         free_netdev(net);
1446
1447         return 0;
1448 }
1449
1450 static int dvb_net_do_ioctl(struct file *file,
1451                   unsigned int cmd, void *parg)
1452 {
1453         struct dvb_device *dvbdev = file->private_data;
1454         struct dvb_net *dvbnet = dvbdev->priv;
1455         int ret = 0;
1456
1457         if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1458                 return -EPERM;
1459
1460         if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1461                 return -ERESTARTSYS;
1462
1463         switch (cmd) {
1464         case NET_ADD_IF:
1465         {
1466                 struct dvb_net_if *dvbnetif = parg;
1467                 int result;
1468
1469                 if (!capable(CAP_SYS_ADMIN)) {
1470                         ret = -EPERM;
1471                         goto ioctl_error;
1472                 }
1473
1474                 if (!try_module_get(dvbdev->adapter->module)) {
1475                         ret = -EPERM;
1476                         goto ioctl_error;
1477                 }
1478
1479                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1480                 if (result<0) {
1481                         module_put(dvbdev->adapter->module);
1482                         ret = result;
1483                         goto ioctl_error;
1484                 }
1485                 dvbnetif->if_num=result;
1486                 break;
1487         }
1488         case NET_GET_IF:
1489         {
1490                 struct net_device *netdev;
1491                 struct dvb_net_priv *priv_data;
1492                 struct dvb_net_if *dvbnetif = parg;
1493
1494                 if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
1495                     !dvbnet->state[dvbnetif->if_num]) {
1496                         ret = -EINVAL;
1497                         goto ioctl_error;
1498                 }
1499
1500                 netdev = dvbnet->device[dvbnetif->if_num];
1501
1502                 priv_data = netdev_priv(netdev);
1503                 dvbnetif->pid=priv_data->pid;
1504                 dvbnetif->feedtype=priv_data->feedtype;
1505                 break;
1506         }
1507         case NET_REMOVE_IF:
1508         {
1509                 if (!capable(CAP_SYS_ADMIN)) {
1510                         ret = -EPERM;
1511                         goto ioctl_error;
1512                 }
1513                 if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1514                         ret = -EINVAL;
1515                         goto ioctl_error;
1516                 }
1517                 ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1518                 if (!ret)
1519                         module_put(dvbdev->adapter->module);
1520                 break;
1521         }
1522
1523         /* binary compatibility cruft */
1524         case __NET_ADD_IF_OLD:
1525         {
1526                 struct __dvb_net_if_old *dvbnetif = parg;
1527                 int result;
1528
1529                 if (!capable(CAP_SYS_ADMIN)) {
1530                         ret = -EPERM;
1531                         goto ioctl_error;
1532                 }
1533
1534                 if (!try_module_get(dvbdev->adapter->module)) {
1535                         ret = -EPERM;
1536                         goto ioctl_error;
1537                 }
1538
1539                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1540                 if (result<0) {
1541                         module_put(dvbdev->adapter->module);
1542                         ret = result;
1543                         goto ioctl_error;
1544                 }
1545                 dvbnetif->if_num=result;
1546                 break;
1547         }
1548         case __NET_GET_IF_OLD:
1549         {
1550                 struct net_device *netdev;
1551                 struct dvb_net_priv *priv_data;
1552                 struct __dvb_net_if_old *dvbnetif = parg;
1553
1554                 if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
1555                     !dvbnet->state[dvbnetif->if_num]) {
1556                         ret = -EINVAL;
1557                         goto ioctl_error;
1558                 }
1559
1560                 netdev = dvbnet->device[dvbnetif->if_num];
1561
1562                 priv_data = netdev_priv(netdev);
1563                 dvbnetif->pid=priv_data->pid;
1564                 break;
1565         }
1566         default:
1567                 ret = -ENOTTY;
1568                 break;
1569         }
1570
1571 ioctl_error:
1572         mutex_unlock(&dvbnet->ioctl_mutex);
1573         return ret;
1574 }
1575
1576 static long dvb_net_ioctl(struct file *file,
1577               unsigned int cmd, unsigned long arg)
1578 {
1579         return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1580 }
1581
1582 static int dvb_net_close(struct inode *inode, struct file *file)
1583 {
1584         struct dvb_device *dvbdev = file->private_data;
1585         struct dvb_net *dvbnet = dvbdev->priv;
1586
1587         dvb_generic_release(inode, file);
1588
1589         if(dvbdev->users == 1 && dvbnet->exit == 1)
1590                 wake_up(&dvbdev->wait_queue);
1591         return 0;
1592 }
1593
1594
1595 static const struct file_operations dvb_net_fops = {
1596         .owner = THIS_MODULE,
1597         .unlocked_ioctl = dvb_net_ioctl,
1598         .open = dvb_generic_open,
1599         .release = dvb_net_close,
1600         .llseek = noop_llseek,
1601 };
1602
1603 static const struct dvb_device dvbdev_net = {
1604         .priv = NULL,
1605         .users = 1,
1606         .writers = 1,
1607 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1608         .name = "dvb-net",
1609 #endif
1610         .fops = &dvb_net_fops,
1611 };
1612
1613 void dvb_net_release (struct dvb_net *dvbnet)
1614 {
1615         int i;
1616
1617         dvbnet->exit = 1;
1618         if (dvbnet->dvbdev->users < 1)
1619                 wait_event(dvbnet->dvbdev->wait_queue,
1620                                 dvbnet->dvbdev->users==1);
1621
1622         dvb_unregister_device(dvbnet->dvbdev);
1623
1624         for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1625                 if (!dvbnet->state[i])
1626                         continue;
1627                 dvb_net_remove_if(dvbnet, i);
1628         }
1629 }
1630 EXPORT_SYMBOL(dvb_net_release);
1631
1632
1633 int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1634                   struct dmx_demux *dmx)
1635 {
1636         int i;
1637
1638         mutex_init(&dvbnet->ioctl_mutex);
1639         dvbnet->demux = dmx;
1640
1641         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1642                 dvbnet->state[i] = 0;
1643
1644         return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1645                              dvbnet, DVB_DEVICE_NET, 0);
1646 }
1647 EXPORT_SYMBOL(dvb_net_init);