drivers/media/dvb-core/dvb_net.c

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