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 #include <linux/module.h>
  58 #include <linux/kernel.h>
  59 #include <linux/netdevice.h>
  60 #include <linux/nospec.h>
  61 #include <linux/etherdevice.h>
  62 #include <linux/dvb/net.h>
  63 #include <linux/uio.h>
  64 #include <asm/uaccess.h>
  65 #include <linux/crc32.h>
  66 #include <linux/mutex.h>
  67 #include <linux/sched.h>
  68
  69 #include "dvb_demux.h"
  70 #include "dvb_net.h"
  71
  72 static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
  73 {
  74         unsigned int j;
  75         for (j = 0; j < cnt; j++)
  76                 c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
  77         return c;
  78 }
  79
  80
  81 #define DVB_NET_MULTICAST_MAX 10
  82
  83 #undef ULE_DEBUG
  84
  85 #ifdef ULE_DEBUG
  86
  87 static void hexdump(const unsigned char *buf, unsigned short len)
  88 {
  89         print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  90 }
  91
  92 #endif
  93
  94 struct dvb_net_priv {
  95         int in_use;
  96         u16 pid;
  97         struct net_device *net;
  98         struct dvb_net *host;
  99         struct dmx_demux *demux;
 100         struct dmx_section_feed *secfeed;
 101         struct dmx_section_filter *secfilter;
 102         struct dmx_ts_feed *tsfeed;
 103         int multi_num;
 104         struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
 105         unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
 106         int rx_mode;
 107 #define RX_MODE_UNI 0
 108 #define RX_MODE_MULTI 1
 109 #define RX_MODE_ALL_MULTI 2
 110 #define RX_MODE_PROMISC 3
 111         struct work_struct set_multicast_list_wq;
 112         struct work_struct restart_net_feed_wq;
 113         unsigned char feedtype;                 /* Either FEED_TYPE_ or FEED_TYPE_ULE */
 114         int need_pusi;                          /* Set to 1, if synchronization on PUSI required. */
 115         unsigned char tscc;                     /* TS continuity counter after sync on PUSI. */
 116         struct sk_buff *ule_skb;                /* ULE SNDU decodes into this buffer. */
 117         unsigned char *ule_next_hdr;            /* Pointer into skb to next ULE extension header. */
 118         unsigned short ule_sndu_len;            /* ULE SNDU length in bytes, w/o D-Bit. */
 119         unsigned short ule_sndu_type;           /* ULE SNDU type field, complete. */
 120         unsigned char ule_sndu_type_1;          /* ULE SNDU type field, if split across 2 TS cells. */
 121         unsigned char ule_dbit;                 /* Whether the DestMAC address present
 122                                                  * or not (bit is set). */
 123         unsigned char ule_bridged;              /* Whether the ULE_BRIDGED extension header was found. */
 124         int ule_sndu_remain;                    /* Nr. of bytes still required for current ULE SNDU. */
 125         unsigned long ts_count;                 /* Current ts cell counter. */
 126         struct mutex mutex;
 127 };
 128
 129
 130 /**
 131  *      Determine the packet's protocol ID. The rule here is that we
 132  *      assume 802.3 if the type field is short enough to be a length.
 133  *      This is normal practice and works for any 'now in use' protocol.
 134  *
 135  *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 136  *  by Michael Holzt <kju@debian.org>
 137  */
 138 static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 139                                       struct net_device *dev)
 140 {
 141         struct ethhdr *eth;
 142         unsigned char *rawp;
 143
 144         skb_reset_mac_header(skb);
 145         skb_pull(skb,dev->hard_header_len);
 146         eth = eth_hdr(skb);
 147
 148         if (*eth->h_dest & 1) {
 149                 if(ether_addr_equal(eth->h_dest,dev->broadcast))
 150                         skb->pkt_type=PACKET_BROADCAST;
 151                 else
 152                         skb->pkt_type=PACKET_MULTICAST;
 153         }
 154
 155         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 156                 return eth->h_proto;
 157
 158         rawp = skb->data;
 159
 160         /**
 161          *      This is a magic hack to spot IPX packets. Older Novell breaks
 162          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
 163          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 164          *      won't work for fault tolerant netware but does for the rest.
 165          */
 166         if (*(unsigned short *)rawp == 0xFFFF)
 167                 return htons(ETH_P_802_3);
 168
 169         /**
 170          *      Real 802.2 LLC
 171          */
 172         return htons(ETH_P_802_2);
 173 }
 174
 175 #define TS_SZ   188
 176 #define TS_SYNC 0x47
 177 #define TS_TEI  0x80
 178 #define TS_SC   0xC0
 179 #define TS_PUSI 0x40
 180 #define TS_AF_A 0x20
 181 #define TS_AF_D 0x10
 182
 183 /* ULE Extension Header handlers. */
 184
 185 #define ULE_TEST        0
 186 #define ULE_BRIDGED     1
 187
 188 #define ULE_OPTEXTHDR_PADDING 0
 189
 190 static int ule_test_sndu( struct dvb_net_priv *p )
 191 {
 192         return -1;
 193 }
 194
 195 static int ule_bridged_sndu( struct dvb_net_priv *p )
 196 {
 197         struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
 198         if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 199                 int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
 200                 /* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 201                 if(framelen != ntohs(hdr->h_proto)) {
 202                         return -1;
 203                 }
 204         }
 205         /* Note:
 206          * From RFC4326:
 207          *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
 208          *   It must be the final (or only) extension header specified in the header chain of a SNDU."
 209          * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
 210          */
 211         p->ule_bridged = 1;
 212         return 0;
 213 }
 214
 215 static int ule_exthdr_padding(struct dvb_net_priv *p)
 216 {
 217         return 0;
 218 }
 219
 220 /** Handle ULE extension headers.
 221  *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 222  *  Returns: >= 0: nr. of bytes consumed by next extension header
 223  *           -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 224  */
 225 static int handle_one_ule_extension( struct dvb_net_priv *p )
 226 {
 227         /* Table of mandatory extension header handlers.  The header type is the index. */
 228         static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
 229                 { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
 230
 231         /* Table of optional extension header handlers.  The header type is the index. */
 232         static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
 233                 { [0] = ule_exthdr_padding, [1] = NULL, };
 234
 235         int ext_len = 0;
 236         unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
 237         unsigned char htype = p->ule_sndu_type & 0x00FF;
 238
 239         /* Discriminate mandatory and optional extension headers. */
 240         if (hlen == 0) {
 241                 /* Mandatory extension header */
 242                 if (ule_mandatory_ext_handlers[htype]) {
 243                         ext_len = ule_mandatory_ext_handlers[htype]( p );
 244                         if(ext_len >= 0) {
 245                                 p->ule_next_hdr += ext_len;
 246                                 if (!p->ule_bridged) {
 247                                         p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
 248                                         p->ule_next_hdr += 2;
 249                                 } else {
 250                                         p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
 251                                         /* This assures the extension handling loop will terminate. */
 252                                 }
 253                         }
 254                         // else: extension handler failed or SNDU should be discarded
 255                 } else
 256                         ext_len = -1;   /* SNDU has to be discarded. */
 257         } else {
 258                 /* Optional extension header.  Calculate the length. */
 259                 ext_len = hlen << 1;
 260                 /* Process the optional extension header according to its type. */
 261                 if (ule_optional_ext_handlers[htype])
 262                         (void)ule_optional_ext_handlers[htype]( p );
 263                 p->ule_next_hdr += ext_len;
 264                 p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
 265                 /*
 266                  * note: the length of the next header type is included in the
 267                  * length of THIS optional extension header
 268                  */
 269         }
 270
 271         return ext_len;
 272 }
 273
 274 static int handle_ule_extensions( struct dvb_net_priv *p )
 275 {
 276         int total_ext_len = 0, l;
 277
 278         p->ule_next_hdr = p->ule_skb->data;
 279         do {
 280                 l = handle_one_ule_extension( p );
 281                 if (l < 0)
 282                         return l;       /* Stop extension header processing and discard SNDU. */
 283                 total_ext_len += l;
 284 #ifdef ULE_DEBUG
 285                 pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
 286                          p->ule_next_hdr, (int)p->ule_sndu_type,
 287                          l, total_ext_len);
 288 #endif
 289
 290         } while (p->ule_sndu_type < ETH_P_802_3_MIN);
 291
 292         return total_ext_len;
 293 }
 294
 295
 296 /** Prepare for a new ULE SNDU: reset the decoder state. */
 297 static inline void reset_ule( struct dvb_net_priv *p )
 298 {
 299         p->ule_skb = NULL;
 300         p->ule_next_hdr = NULL;
 301         p->ule_sndu_len = 0;
 302         p->ule_sndu_type = 0;
 303         p->ule_sndu_type_1 = 0;
 304         p->ule_sndu_remain = 0;
 305         p->ule_dbit = 0xFF;
 306         p->ule_bridged = 0;
 307 }
 308
 309 /**
 310  * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 311  * TS cells of a single PID.
 312  */
 313 static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
 314 {
 315         struct dvb_net_priv *priv = netdev_priv(dev);
 316         unsigned long skipped = 0L;
 317         const u8 *ts, *ts_end, *from_where = NULL;
 318         u8 ts_remain = 0, how_much = 0, new_ts = 1;
 319         struct ethhdr *ethh = NULL;
 320         bool error = false;
 321
 322 #ifdef ULE_DEBUG
 323         /* The code inside ULE_DEBUG keeps a history of the last 100 TS cells processed. */
 324         static unsigned char ule_hist[100*TS_SZ];
 325         static unsigned char *ule_where = ule_hist, ule_dump;
 326 #endif
 327
 328         /* For all TS cells in current buffer.
 329          * Appearently, we are called for every single TS cell.
 330          */
 331         for (ts = buf, ts_end = buf + buf_len; ts < ts_end; /* no default incr. */ ) {
 332
 333                 if (new_ts) {
 334                         /* We are about to process a new TS cell. */
 335
 336 #ifdef ULE_DEBUG
 337                         if (ule_where >= &ule_hist[100*TS_SZ]) ule_where = ule_hist;
 338                         memcpy( ule_where, ts, TS_SZ );
 339                         if (ule_dump) {
 340                                 hexdump( ule_where, TS_SZ );
 341                                 ule_dump = 0;
 342                         }
 343                         ule_where += TS_SZ;
 344 #endif
 345
 346                         /* Check TS error conditions: sync_byte, transport_error_indicator, scrambling_control . */
 347                         if ((ts[0] != TS_SYNC) || (ts[1] & TS_TEI) || ((ts[3] & TS_SC) != 0)) {
 348                                 printk(KERN_WARNING "%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
 349                                        priv->ts_count, ts[0],
 350                                        (ts[1] & TS_TEI) >> 7,
 351                                        (ts[3] & TS_SC) >> 6);
 352
 353                                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 354                                 if (priv->ule_skb) {
 355                                         dev_kfree_skb( priv->ule_skb );
 356                                         /* Prepare for next SNDU. */
 357                                         dev->stats.rx_errors++;
 358                                         dev->stats.rx_frame_errors++;
 359                                 }
 360                                 reset_ule(priv);
 361                                 priv->need_pusi = 1;
 362
 363                                 /* Continue with next TS cell. */
 364                                 ts += TS_SZ;
 365                                 priv->ts_count++;
 366                                 continue;
 367                         }
 368
 369                         ts_remain = 184;
 370                         from_where = ts + 4;
 371                 }
 372                 /* Synchronize on PUSI, if required. */
 373                 if (priv->need_pusi) {
 374                         if (ts[1] & TS_PUSI) {
 375                                 /* Find beginning of first ULE SNDU in current TS cell. */
 376                                 /* Synchronize continuity counter. */
 377                                 priv->tscc = ts[3] & 0x0F;
 378                                 /* There is a pointer field here. */
 379                                 if (ts[4] > ts_remain) {
 380                                         printk(KERN_ERR "%lu: Invalid ULE packet "
 381                                                "(pointer field %d)\n", priv->ts_count, ts[4]);
 382                                         ts += TS_SZ;
 383                                         priv->ts_count++;
 384                                         continue;
 385                                 }
 386                                 /* Skip to destination of pointer field. */
 387                                 from_where = &ts[5] + ts[4];
 388                                 ts_remain -= 1 + ts[4];
 389                                 skipped = 0;
 390                         } else {
 391                                 skipped++;
 392                                 ts += TS_SZ;
 393                                 priv->ts_count++;
 394                                 continue;
 395                         }
 396                 }
 397
 398                 if (new_ts) {
 399                         /* Check continuity counter. */
 400                         if ((ts[3] & 0x0F) == priv->tscc)
 401                                 priv->tscc = (priv->tscc + 1) & 0x0F;
 402                         else {
 403                                 /* TS discontinuity handling: */
 404                                 printk(KERN_WARNING "%lu: TS discontinuity: got %#x, "
 405                                        "expected %#x.\n", priv->ts_count, ts[3] & 0x0F, priv->tscc);
 406                                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 407                                 if (priv->ule_skb) {
 408                                         dev_kfree_skb( priv->ule_skb );
 409                                         /* Prepare for next SNDU. */
 410                                         // reset_ule(priv);  moved to below.
 411                                         dev->stats.rx_errors++;
 412                                         dev->stats.rx_frame_errors++;
 413                                 }
 414                                 reset_ule(priv);
 415                                 /* skip to next PUSI. */
 416                                 priv->need_pusi = 1;
 417                                 continue;
 418                         }
 419                         /* If we still have an incomplete payload, but PUSI is
 420                          * set; some TS cells are missing.
 421                          * This is only possible here, if we missed exactly 16 TS
 422                          * cells (continuity counter wrap). */
 423                         if (ts[1] & TS_PUSI) {
 424                                 if (! priv->need_pusi) {
 425                                         if (!(*from_where < (ts_remain-1)) || *from_where != priv->ule_sndu_remain) {
 426                                                 /* Pointer field is invalid.  Drop this TS cell and any started ULE SNDU. */
 427                                                 printk(KERN_WARNING "%lu: Invalid pointer "
 428                                                        "field: %u.\n", priv->ts_count, *from_where);
 429
 430                                                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 431                                                 if (priv->ule_skb) {
 432                                                         error = true;
 433                                                         dev_kfree_skb(priv->ule_skb);
 434                                                 }
 435
 436                                                 if (error || priv->ule_sndu_remain) {
 437                                                         dev->stats.rx_errors++;
 438                                                         dev->stats.rx_frame_errors++;
 439                                                         error = false;
 440                                                 }
 441
 442                                                 reset_ule(priv);
 443                                                 priv->need_pusi = 1;
 444                                                 continue;
 445                                         }
 446                                         /* Skip pointer field (we're processing a
 447                                          * packed payload). */
 448                                         from_where += 1;
 449                                         ts_remain -= 1;
 450                                 } else
 451                                         priv->need_pusi = 0;
 452
 453                                 if (priv->ule_sndu_remain > 183) {
 454                                         /* Current SNDU lacks more data than there could be available in the
 455                                          * current TS cell. */
 456                                         dev->stats.rx_errors++;
 457                                         dev->stats.rx_length_errors++;
 458                                         printk(KERN_WARNING "%lu: Expected %d more SNDU bytes, but "
 459                                                "got PUSI (pf %d, ts_remain %d).  Flushing incomplete payload.\n",
 460                                                priv->ts_count, priv->ule_sndu_remain, ts[4], ts_remain);
 461                                         dev_kfree_skb(priv->ule_skb);
 462                                         /* Prepare for next SNDU. */
 463                                         reset_ule(priv);
 464                                         /* Resync: go to where pointer field points to: start of next ULE SNDU. */
 465                                         from_where += ts[4];
 466                                         ts_remain -= ts[4];
 467                                 }
 468                         }
 469                 }
 470
 471                 /* Check if new payload needs to be started. */
 472                 if (priv->ule_skb == NULL) {
 473                         /* Start a new payload with skb.
 474                          * Find ULE header.  It is only guaranteed that the
 475                          * length field (2 bytes) is contained in the current
 476                          * TS.
 477                          * Check ts_remain has to be >= 2 here. */
 478                         if (ts_remain < 2) {
 479                                 printk(KERN_WARNING "Invalid payload packing: only %d "
 480                                        "bytes left in TS.  Resyncing.\n", ts_remain);
 481                                 priv->ule_sndu_len = 0;
 482                                 priv->need_pusi = 1;
 483                                 ts += TS_SZ;
 484                                 continue;
 485                         }
 486
 487                         if (! priv->ule_sndu_len) {
 488                                 /* Got at least two bytes, thus extrace the SNDU length. */
 489                                 priv->ule_sndu_len = from_where[0] << 8 | from_where[1];
 490                                 if (priv->ule_sndu_len & 0x8000) {
 491                                         /* D-Bit is set: no dest mac present. */
 492                                         priv->ule_sndu_len &= 0x7FFF;
 493                                         priv->ule_dbit = 1;
 494                                 } else
 495                                         priv->ule_dbit = 0;
 496
 497                                 if (priv->ule_sndu_len < 5) {
 498                                         printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
 499                                                "Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
 500                                         dev->stats.rx_errors++;
 501                                         dev->stats.rx_length_errors++;
 502                                         priv->ule_sndu_len = 0;
 503                                         priv->need_pusi = 1;
 504                                         new_ts = 1;
 505                                         ts += TS_SZ;
 506                                         priv->ts_count++;
 507                                         continue;
 508                                 }
 509                                 ts_remain -= 2; /* consume the 2 bytes SNDU length. */
 510                                 from_where += 2;
 511                         }
 512
 513                         priv->ule_sndu_remain = priv->ule_sndu_len + 2;
 514                         /*
 515                          * State of current TS:
 516                          *   ts_remain (remaining bytes in the current TS cell)
 517                          *   0  ule_type is not available now, we need the next TS cell
 518                          *   1  the first byte of the ule_type is present
 519                          * >=2  full ULE header present, maybe some payload data as well.
 520                          */
 521                         switch (ts_remain) {
 522                                 case 1:
 523                                         priv->ule_sndu_remain--;
 524                                         priv->ule_sndu_type = from_where[0] << 8;
 525                                         priv->ule_sndu_type_1 = 1; /* first byte of ule_type is set. */
 526                                         ts_remain -= 1; from_where += 1;
 527                                         /* Continue w/ next TS. */
 528                                 case 0:
 529                                         new_ts = 1;
 530                                         ts += TS_SZ;
 531                                         priv->ts_count++;
 532                                         continue;
 533
 534                                 default: /* complete ULE header is present in current TS. */
 535                                         /* Extract ULE type field. */
 536                                         if (priv->ule_sndu_type_1) {
 537                                                 priv->ule_sndu_type_1 = 0;
 538                                                 priv->ule_sndu_type |= from_where[0];
 539                                                 from_where += 1; /* points to payload start. */
 540                                                 ts_remain -= 1;
 541                                         } else {
 542                                                 /* Complete type is present in new TS. */
 543                                                 priv->ule_sndu_type = from_where[0] << 8 | from_where[1];
 544                                                 from_where += 2; /* points to payload start. */
 545                                                 ts_remain -= 2;
 546                                         }
 547                                         break;
 548                         }
 549
 550                         /* Allocate the skb (decoder target buffer) with the correct size, as follows:
 551                          * prepare for the largest case: bridged SNDU with MAC address (dbit = 0). */
 552                         priv->ule_skb = dev_alloc_skb( priv->ule_sndu_len + ETH_HLEN + ETH_ALEN );
 553                         if (priv->ule_skb == NULL) {
 554                                 printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
 555                                        dev->name);
 556                                 dev->stats.rx_dropped++;
 557                                 return;
 558                         }
 559
 560                         /* This includes the CRC32 _and_ dest mac, if !dbit. */
 561                         priv->ule_sndu_remain = priv->ule_sndu_len;
 562                         priv->ule_skb->dev = dev;
 563                         /* Leave space for Ethernet or bridged SNDU header (eth hdr plus one MAC addr). */
 564                         skb_reserve( priv->ule_skb, ETH_HLEN + ETH_ALEN );
 565                 }
 566
 567                 /* Copy data into our current skb. */
 568                 how_much = min(priv->ule_sndu_remain, (int)ts_remain);
 569                 memcpy(skb_put(priv->ule_skb, how_much), from_where, how_much);
 570                 priv->ule_sndu_remain -= how_much;
 571                 ts_remain -= how_much;
 572                 from_where += how_much;
 573
 574                 /* Check for complete payload. */
 575                 if (priv->ule_sndu_remain <= 0) {
 576                         /* Check CRC32, we've got it in our skb already. */
 577                         __be16 ulen = htons(priv->ule_sndu_len);
 578                         __be16 utype = htons(priv->ule_sndu_type);
 579                         const u8 *tail;
 580                         struct kvec iov[3] = {
 581                                 { &ulen, sizeof ulen },
 582                                 { &utype, sizeof utype },
 583                                 { priv->ule_skb->data, priv->ule_skb->len - 4 }
 584                         };
 585                         u32 ule_crc = ~0L, expected_crc;
 586                         if (priv->ule_dbit) {
 587                                 /* Set D-bit for CRC32 verification,
 588                                  * if it was set originally. */
 589                                 ulen |= htons(0x8000);
 590                         }
 591
 592                         ule_crc = iov_crc32(ule_crc, iov, 3);
 593                         tail = skb_tail_pointer(priv->ule_skb);
 594                         expected_crc = *(tail - 4) << 24 |
 595                                        *(tail - 3) << 16 |
 596                                        *(tail - 2) << 8 |
 597                                        *(tail - 1);
 598                         if (ule_crc != expected_crc) {
 599                                 printk(KERN_WARNING "%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
 600                                        priv->ts_count, ule_crc, expected_crc, priv->ule_sndu_len, priv->ule_sndu_type, ts_remain, ts_remain > 2 ? *(unsigned short *)from_where : 0);
 601
 602 #ifdef ULE_DEBUG
 603                                 hexdump( iov[0].iov_base, iov[0].iov_len );
 604                                 hexdump( iov[1].iov_base, iov[1].iov_len );
 605                                 hexdump( iov[2].iov_base, iov[2].iov_len );
 606
 607                                 if (ule_where == ule_hist) {
 608                                         hexdump( &ule_hist[98*TS_SZ], TS_SZ );
 609                                         hexdump( &ule_hist[99*TS_SZ], TS_SZ );
 610                                 } else if (ule_where == &ule_hist[TS_SZ]) {
 611                                         hexdump( &ule_hist[99*TS_SZ], TS_SZ );
 612                                         hexdump( ule_hist, TS_SZ );
 613                                 } else {
 614                                         hexdump( ule_where - TS_SZ - TS_SZ, TS_SZ );
 615                                         hexdump( ule_where - TS_SZ, TS_SZ );
 616                                 }
 617                                 ule_dump = 1;
 618 #endif
 619
 620                                 dev->stats.rx_errors++;
 621                                 dev->stats.rx_crc_errors++;
 622                                 dev_kfree_skb(priv->ule_skb);
 623                         } else {
 624                                 /* CRC32 verified OK. */
 625                                 u8 dest_addr[ETH_ALEN];
 626                                 static const u8 bc_addr[ETH_ALEN] =
 627                                         { [ 0 ... ETH_ALEN-1] = 0xff };
 628
 629                                 /* CRC32 was OK. Remove it from skb. */
 630                                 priv->ule_skb->tail -= 4;
 631                                 priv->ule_skb->len -= 4;
 632
 633                                 if (!priv->ule_dbit) {
 634                                         /*
 635                                          * The destination MAC address is the
 636                                          * next data in the skb.  It comes
 637                                          * before any extension headers.
 638                                          *
 639                                          * Check if the payload of this SNDU
 640                                          * should be passed up the stack.
 641                                          */
 642                                         register int drop = 0;
 643                                         if (priv->rx_mode != RX_MODE_PROMISC) {
 644                                                 if (priv->ule_skb->data[0] & 0x01) {
 645                                                         /* multicast or broadcast */
 646                                                         if (!ether_addr_equal(priv->ule_skb->data, bc_addr)) {
 647                                                                 /* multicast */
 648                                                                 if (priv->rx_mode == RX_MODE_MULTI) {
 649                                                                         int i;
 650                                                                         for(i = 0; i < priv->multi_num &&
 651                                                                             !ether_addr_equal(priv->ule_skb->data,
 652                                                                                               priv->multi_macs[i]); i++)
 653                                                                                 ;
 654                                                                         if (i == priv->multi_num)
 655                                                                                 drop = 1;
 656                                                                 } else if (priv->rx_mode != RX_MODE_ALL_MULTI)
 657                                                                         drop = 1; /* no broadcast; */
 658                                                                 /* else: all multicast mode: accept all multicast packets */
 659                                                         }
 660                                                         /* else: broadcast */
 661                                                 }
 662                                                 else if (!ether_addr_equal(priv->ule_skb->data, dev->dev_addr))
 663                                                         drop = 1;
 664                                                 /* else: destination address matches the MAC address of our receiver device */
 665                                         }
 666                                         /* else: promiscuous mode; pass everything up the stack */
 667
 668                                         if (drop) {
 669 #ifdef ULE_DEBUG
 670                                                 netdev_dbg(dev, "Dropping SNDU: MAC destination address does not match: dest addr: %pM, dev addr: %pM\n",
 671                                                            priv->ule_skb->data, dev->dev_addr);
 672 #endif
 673                                                 dev_kfree_skb(priv->ule_skb);
 674                                                 goto sndu_done;
 675                                         }
 676                                         else
 677                                         {
 678                                                 skb_copy_from_linear_data(priv->ule_skb,
 679                                                               dest_addr,
 680                                                               ETH_ALEN);
 681                                                 skb_pull(priv->ule_skb, ETH_ALEN);
 682                                         }
 683                                 }
 684
 685                                 /* Handle ULE Extension Headers. */
 686                                 if (priv->ule_sndu_type < ETH_P_802_3_MIN) {
 687                                         /* There is an extension header.  Handle it accordingly. */
 688                                         int l = handle_ule_extensions(priv);
 689                                         if (l < 0) {
 690                                                 /* Mandatory extension header unknown or TEST SNDU.  Drop it. */
 691                                                 // printk( KERN_WARNING "Dropping SNDU, extension headers.\n" );
 692                                                 dev_kfree_skb(priv->ule_skb);
 693                                                 goto sndu_done;
 694                                         }
 695                                         skb_pull(priv->ule_skb, l);
 696                                 }
 697
 698                                 /*
 699                                  * Construct/assure correct ethernet header.
 700                                  * Note: in bridged mode (priv->ule_bridged !=
 701                                  * 0) we already have the (original) ethernet
 702                                  * header at the start of the payload (after
 703                                  * optional dest. address and any extension
 704                                  * headers).
 705                                  */
 706
 707                                 if (!priv->ule_bridged) {
 708                                         skb_push(priv->ule_skb, ETH_HLEN);
 709                                         ethh = (struct ethhdr *)priv->ule_skb->data;
 710                                         if (!priv->ule_dbit) {
 711                                                  /* dest_addr buffer is only valid if priv->ule_dbit == 0 */
 712                                                 memcpy(ethh->h_dest, dest_addr, ETH_ALEN);
 713                                                 eth_zero_addr(ethh->h_source);
 714                                         }
 715                                         else /* zeroize source and dest */
 716                                                 memset( ethh, 0, ETH_ALEN*2 );
 717
 718                                         ethh->h_proto = htons(priv->ule_sndu_type);
 719                                 }
 720                                 /* else:  skb is in correct state; nothing to do. */
 721                                 priv->ule_bridged = 0;
 722
 723                                 /* Stuff into kernel's protocol stack. */
 724                                 priv->ule_skb->protocol = dvb_net_eth_type_trans(priv->ule_skb, dev);
 725                                 /* If D-bit is set (i.e. destination MAC address not present),
 726                                  * receive the packet anyhow. */
 727                                 /* if (priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
 728                                         priv->ule_skb->pkt_type = PACKET_HOST; */
 729                                 dev->stats.rx_packets++;
 730                                 dev->stats.rx_bytes += priv->ule_skb->len;
 731                                 netif_rx(priv->ule_skb);
 732                         }
 733                         sndu_done:
 734                         /* Prepare for next SNDU. */
 735                         reset_ule(priv);
 736                 }
 737
 738                 /* More data in current TS (look at the bytes following the CRC32)? */
 739                 if (ts_remain >= 2 && *((unsigned short *)from_where) != 0xFFFF) {
 740                         /* Next ULE SNDU starts right there. */
 741                         new_ts = 0;
 742                         priv->ule_skb = NULL;
 743                         priv->ule_sndu_type_1 = 0;
 744                         priv->ule_sndu_len = 0;
 745                         // printk(KERN_WARNING "More data in current TS: [%#x %#x %#x %#x]\n",
 746                         //      *(from_where + 0), *(from_where + 1),
 747                         //      *(from_where + 2), *(from_where + 3));
 748                         // printk(KERN_WARNING "ts @ %p, stopped @ %p:\n", ts, from_where + 0);
 749                         // hexdump(ts, 188);
 750                 } else {
 751                         new_ts = 1;
 752                         ts += TS_SZ;
 753                         priv->ts_count++;
 754                         if (priv->ule_skb == NULL) {
 755                                 priv->need_pusi = 1;
 756                                 priv->ule_sndu_type_1 = 0;
 757                                 priv->ule_sndu_len = 0;
 758                         }
 759                 }
 760         }       /* for all available TS cells */
 761 }
 762
 763 static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
 764                                const u8 *buffer2, size_t buffer2_len,
 765                                struct dmx_ts_feed *feed)
 766 {
 767         struct net_device *dev = feed->priv;
 768
 769         if (buffer2)
 770                 printk(KERN_WARNING "buffer2 not NULL: %p.\n", buffer2);
 771         if (buffer1_len > 32768)
 772                 printk(KERN_WARNING "length > 32k: %zu.\n", buffer1_len);
 773         /* printk("TS callback: %u bytes, %u TS cells @ %p.\n",
 774                   buffer1_len, buffer1_len / TS_SZ, buffer1); */
 775         dvb_net_ule(dev, buffer1, buffer1_len);
 776         return 0;
 777 }
 778
 779
 780 static void dvb_net_sec(struct net_device *dev,
 781                         const u8 *pkt, int pkt_len)
 782 {
 783         u8 *eth;
 784         struct sk_buff *skb;
 785         struct net_device_stats *stats = &dev->stats;
 786         int snap = 0;
 787
 788         /* note: pkt_len includes a 32bit checksum */
 789         if (pkt_len < 16) {
 790                 printk("%s: IP/MPE packet length = %d too small.\n",
 791                         dev->name, pkt_len);
 792                 stats->rx_errors++;
 793                 stats->rx_length_errors++;
 794                 return;
 795         }
 796 /* it seems some ISPs manage to screw up here, so we have to
 797  * relax the error checks... */
 798 #if 0
 799         if ((pkt[5] & 0xfd) != 0xc1) {
 800                 /* drop scrambled or broken packets */
 801 #else
 802         if ((pkt[5] & 0x3c) != 0x00) {
 803                 /* drop scrambled */
 804 #endif
 805                 stats->rx_errors++;
 806                 stats->rx_crc_errors++;
 807                 return;
 808         }
 809         if (pkt[5] & 0x02) {
 810                 /* handle LLC/SNAP, see rfc-1042 */
 811                 if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
 812                         stats->rx_dropped++;
 813                         return;
 814                 }
 815                 snap = 8;
 816         }
 817         if (pkt[7]) {
 818                 /* FIXME: assemble datagram from multiple sections */
 819                 stats->rx_errors++;
 820                 stats->rx_frame_errors++;
 821                 return;
 822         }
 823
 824         /* we have 14 byte ethernet header (ip header follows);
 825          * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
 826          */
 827         if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
 828                 //printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
 829                 stats->rx_dropped++;
 830                 return;
 831         }
 832         skb_reserve(skb, 2);    /* longword align L3 header */
 833         skb->dev = dev;
 834
 835         /* copy L3 payload */
 836         eth = (u8 *) skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
 837         memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
 838
 839         /* create ethernet header: */
 840         eth[0]=pkt[0x0b];
 841         eth[1]=pkt[0x0a];
 842         eth[2]=pkt[0x09];
 843         eth[3]=pkt[0x08];
 844         eth[4]=pkt[0x04];
 845         eth[5]=pkt[0x03];
 846
 847         eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
 848
 849         if (snap) {
 850                 eth[12] = pkt[18];
 851                 eth[13] = pkt[19];
 852         } else {
 853                 /* protocol numbers are from rfc-1700 or
 854                  * http://www.iana.org/assignments/ethernet-numbers
 855                  */
 856                 if (pkt[12] >> 4 == 6) { /* version field from IP header */
 857                         eth[12] = 0x86; /* IPv6 */
 858                         eth[13] = 0xdd;
 859                 } else {
 860                         eth[12] = 0x08; /* IPv4 */
 861                         eth[13] = 0x00;
 862                 }
 863         }
 864
 865         skb->protocol = dvb_net_eth_type_trans(skb, dev);
 866
 867         stats->rx_packets++;
 868         stats->rx_bytes+=skb->len;
 869         netif_rx(skb);
 870 }
 871
 872 static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
 873                  const u8 *buffer2, size_t buffer2_len,
 874                  struct dmx_section_filter *filter)
 875 {
 876         struct net_device *dev = filter->priv;
 877
 878         /**
 879          * we rely on the DVB API definition where exactly one complete
 880          * section is delivered in buffer1
 881          */
 882         dvb_net_sec (dev, buffer1, buffer1_len);
 883         return 0;
 884 }
 885
 886 static int dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
 887 {
 888         dev_kfree_skb(skb);
 889         return NETDEV_TX_OK;
 890 }
 891
 892 static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 893 static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
 894 static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
 895 static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 896
 897 static int dvb_net_filter_sec_set(struct net_device *dev,
 898                    struct dmx_section_filter **secfilter,
 899                    u8 *mac, u8 *mac_mask)
 900 {
 901         struct dvb_net_priv *priv = netdev_priv(dev);
 902         int ret;
 903
 904         *secfilter=NULL;
 905         ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
 906         if (ret<0) {
 907                 printk("%s: could not get filter\n", dev->name);
 908                 return ret;
 909         }
 910
 911         (*secfilter)->priv=(void *) dev;
 912
 913         memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
 914         memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
 915         memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
 916
 917         (*secfilter)->filter_value[0]=0x3e;
 918         (*secfilter)->filter_value[3]=mac[5];
 919         (*secfilter)->filter_value[4]=mac[4];
 920         (*secfilter)->filter_value[8]=mac[3];
 921         (*secfilter)->filter_value[9]=mac[2];
 922         (*secfilter)->filter_value[10]=mac[1];
 923         (*secfilter)->filter_value[11]=mac[0];
 924
 925         (*secfilter)->filter_mask[0] = 0xff;
 926         (*secfilter)->filter_mask[3] = mac_mask[5];
 927         (*secfilter)->filter_mask[4] = mac_mask[4];
 928         (*secfilter)->filter_mask[8] = mac_mask[3];
 929         (*secfilter)->filter_mask[9] = mac_mask[2];
 930         (*secfilter)->filter_mask[10] = mac_mask[1];
 931         (*secfilter)->filter_mask[11]=mac_mask[0];
 932
 933         netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
 934
 935         return 0;
 936 }
 937
 938 static int dvb_net_feed_start(struct net_device *dev)
 939 {
 940         int ret = 0, i;
 941         struct dvb_net_priv *priv = netdev_priv(dev);
 942         struct dmx_demux *demux = priv->demux;
 943         unsigned char *mac = (unsigned char *) dev->dev_addr;
 944
 945         netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
 946         mutex_lock(&priv->mutex);
 947         if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
 948                 printk("%s: BUG %d\n", __func__, __LINE__);
 949
 950         priv->secfeed=NULL;
 951         priv->secfilter=NULL;
 952         priv->tsfeed = NULL;
 953
 954         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
 955                 netdev_dbg(dev, "alloc secfeed\n");
 956                 ret=demux->allocate_section_feed(demux, &priv->secfeed,
 957                                          dvb_net_sec_callback);
 958                 if (ret<0) {
 959                         printk("%s: could not allocate section feed\n", dev->name);
 960                         goto error;
 961                 }
 962
 963                 ret = priv->secfeed->set(priv->secfeed, priv->pid, 32768, 1);
 964
 965                 if (ret<0) {
 966                         printk("%s: could not set section feed\n", dev->name);
 967                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
 968                         priv->secfeed=NULL;
 969                         goto error;
 970                 }
 971
 972                 if (priv->rx_mode != RX_MODE_PROMISC) {
 973                         netdev_dbg(dev, "set secfilter\n");
 974                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
 975                 }
 976
 977                 switch (priv->rx_mode) {
 978                 case RX_MODE_MULTI:
 979                         for (i = 0; i < priv->multi_num; i++) {
 980                                 netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
 981                                 dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
 982                                                        priv->multi_macs[i], mask_normal);
 983                         }
 984                         break;
 985                 case RX_MODE_ALL_MULTI:
 986                         priv->multi_num=1;
 987                         netdev_dbg(dev, "set multi_secfilter[0]\n");
 988                         dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
 989                                                mac_allmulti, mask_allmulti);
 990                         break;
 991                 case RX_MODE_PROMISC:
 992                         priv->multi_num=0;
 993                         netdev_dbg(dev, "set secfilter\n");
 994                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
 995                         break;
 996                 }
 997
 998                 netdev_dbg(dev, "start filtering\n");
 999                 priv->secfeed->start_filtering(priv->secfeed);
1000         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1001                 struct timespec timeout = { 0, 10000000 }; // 10 msec
1002
1003                 /* we have payloads encapsulated in TS */
1004                 netdev_dbg(dev, "alloc tsfeed\n");
1005                 ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1006                 if (ret < 0) {
1007                         printk("%s: could not allocate ts feed\n", dev->name);
1008                         goto error;
1009                 }
1010
1011                 /* Set netdevice pointer for ts decaps callback. */
1012                 priv->tsfeed->priv = (void *)dev;
1013                 ret = priv->tsfeed->set(priv->tsfeed,
1014                                         priv->pid, /* pid */
1015                                         TS_PACKET, /* type */
1016                                         DMX_PES_OTHER, /* pes type */
1017                                         32768,     /* circular buffer size */
1018                                         timeout    /* timeout */
1019                                         );
1020
1021                 if (ret < 0) {
1022                         printk("%s: could not set ts feed\n", dev->name);
1023                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1024                         priv->tsfeed = NULL;
1025                         goto error;
1026                 }
1027
1028                 netdev_dbg(dev, "start filtering\n");
1029                 priv->tsfeed->start_filtering(priv->tsfeed);
1030         } else
1031                 ret = -EINVAL;
1032
1033 error:
1034         mutex_unlock(&priv->mutex);
1035         return ret;
1036 }
1037
1038 static int dvb_net_feed_stop(struct net_device *dev)
1039 {
1040         struct dvb_net_priv *priv = netdev_priv(dev);
1041         int i, ret = 0;
1042
1043         mutex_lock(&priv->mutex);
1044         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1045                 if (priv->secfeed) {
1046                         if (priv->secfeed->is_filtering) {
1047                                 netdev_dbg(dev, "stop secfeed\n");
1048                                 priv->secfeed->stop_filtering(priv->secfeed);
1049                         }
1050
1051                         if (priv->secfilter) {
1052                                 netdev_dbg(dev, "release secfilter\n");
1053                                 priv->secfeed->release_filter(priv->secfeed,
1054                                                               priv->secfilter);
1055                                 priv->secfilter=NULL;
1056                         }
1057
1058                         for (i=0; i<priv->multi_num; i++) {
1059                                 if (priv->multi_secfilter[i]) {
1060                                         netdev_dbg(dev, "release multi_filter[%d]\n",
1061                                                    i);
1062                                         priv->secfeed->release_filter(priv->secfeed,
1063                                                                       priv->multi_secfilter[i]);
1064                                         priv->multi_secfilter[i] = NULL;
1065                                 }
1066                         }
1067
1068                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1069                         priv->secfeed = NULL;
1070                 } else
1071                         printk("%s: no feed to stop\n", dev->name);
1072         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1073                 if (priv->tsfeed) {
1074                         if (priv->tsfeed->is_filtering) {
1075                                 netdev_dbg(dev, "stop tsfeed\n");
1076                                 priv->tsfeed->stop_filtering(priv->tsfeed);
1077                         }
1078                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1079                         priv->tsfeed = NULL;
1080                 }
1081                 else
1082                         printk("%s: no ts feed to stop\n", dev->name);
1083         } else
1084                 ret = -EINVAL;
1085         mutex_unlock(&priv->mutex);
1086         return ret;
1087 }
1088
1089
1090 static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1091 {
1092         struct dvb_net_priv *priv = netdev_priv(dev);
1093
1094         if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1095                 return -ENOMEM;
1096
1097         memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1098
1099         priv->multi_num++;
1100         return 0;
1101 }
1102
1103
1104 static void wq_set_multicast_list (struct work_struct *work)
1105 {
1106         struct dvb_net_priv *priv =
1107                 container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1108         struct net_device *dev = priv->net;
1109
1110         dvb_net_feed_stop(dev);
1111         priv->rx_mode = RX_MODE_UNI;
1112         netif_addr_lock_bh(dev);
1113
1114         if (dev->flags & IFF_PROMISC) {
1115                 netdev_dbg(dev, "promiscuous mode\n");
1116                 priv->rx_mode = RX_MODE_PROMISC;
1117         } else if ((dev->flags & IFF_ALLMULTI)) {
1118                 netdev_dbg(dev, "allmulti mode\n");
1119                 priv->rx_mode = RX_MODE_ALL_MULTI;
1120         } else if (!netdev_mc_empty(dev)) {
1121                 struct netdev_hw_addr *ha;
1122
1123                 netdev_dbg(dev, "set_mc_list, %d entries\n",
1124                            netdev_mc_count(dev));
1125
1126                 priv->rx_mode = RX_MODE_MULTI;
1127                 priv->multi_num = 0;
1128
1129                 netdev_for_each_mc_addr(ha, dev)
1130                         dvb_set_mc_filter(dev, ha->addr);
1131         }
1132
1133         netif_addr_unlock_bh(dev);
1134         dvb_net_feed_start(dev);
1135 }
1136
1137
1138 static void dvb_net_set_multicast_list (struct net_device *dev)
1139 {
1140         struct dvb_net_priv *priv = netdev_priv(dev);
1141         schedule_work(&priv->set_multicast_list_wq);
1142 }
1143
1144
1145 static void wq_restart_net_feed (struct work_struct *work)
1146 {
1147         struct dvb_net_priv *priv =
1148                 container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1149         struct net_device *dev = priv->net;
1150
1151         if (netif_running(dev)) {
1152                 dvb_net_feed_stop(dev);
1153                 dvb_net_feed_start(dev);
1154         }
1155 }
1156
1157
1158 static int dvb_net_set_mac (struct net_device *dev, void *p)
1159 {
1160         struct dvb_net_priv *priv = netdev_priv(dev);
1161         struct sockaddr *addr=p;
1162
1163         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1164
1165         if (netif_running(dev))
1166                 schedule_work(&priv->restart_net_feed_wq);
1167
1168         return 0;
1169 }
1170
1171
1172 static int dvb_net_open(struct net_device *dev)
1173 {
1174         struct dvb_net_priv *priv = netdev_priv(dev);
1175
1176         priv->in_use++;
1177         dvb_net_feed_start(dev);
1178         return 0;
1179 }
1180
1181
1182 static int dvb_net_stop(struct net_device *dev)
1183 {
1184         struct dvb_net_priv *priv = netdev_priv(dev);
1185
1186         priv->in_use--;
1187         return dvb_net_feed_stop(dev);
1188 }
1189
1190 static const struct header_ops dvb_header_ops = {
1191         .create         = eth_header,
1192         .parse          = eth_header_parse,
1193 };
1194
1195
1196 static const struct net_device_ops dvb_netdev_ops = {
1197         .ndo_open               = dvb_net_open,
1198         .ndo_stop               = dvb_net_stop,
1199         .ndo_start_xmit         = dvb_net_tx,
1200         .ndo_set_rx_mode        = dvb_net_set_multicast_list,
1201         .ndo_set_mac_address    = dvb_net_set_mac,
1202         .ndo_change_mtu         = eth_change_mtu,
1203         .ndo_validate_addr      = eth_validate_addr,
1204 };
1205
1206 static void dvb_net_setup(struct net_device *dev)
1207 {
1208         ether_setup(dev);
1209
1210         dev->header_ops         = &dvb_header_ops;
1211         dev->netdev_ops         = &dvb_netdev_ops;
1212         dev->mtu                = 4096;
1213
1214         dev->flags |= IFF_NOARP;
1215 }
1216
1217 static int get_if(struct dvb_net *dvbnet)
1218 {
1219         int i;
1220
1221         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1222                 if (!dvbnet->state[i])
1223                         break;
1224
1225         if (i == DVB_NET_DEVICES_MAX)
1226                 return -1;
1227
1228         dvbnet->state[i]=1;
1229         return i;
1230 }
1231
1232 static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1233 {
1234         struct net_device *net;
1235         struct dvb_net_priv *priv;
1236         int result;
1237         int if_num;
1238
1239         if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1240                 return -EINVAL;
1241         if ((if_num = get_if(dvbnet)) < 0)
1242                 return -EINVAL;
1243
1244         net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1245                            NET_NAME_UNKNOWN, dvb_net_setup);
1246         if (!net)
1247                 return -ENOMEM;
1248
1249         if (dvbnet->dvbdev->id)
1250                 snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1251                          dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1252         else
1253                 /* compatibility fix to keep dvb0_0 format */
1254                 snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1255                          dvbnet->dvbdev->adapter->num, if_num);
1256
1257         net->addr_len = 6;
1258         memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
1259
1260         dvbnet->device[if_num] = net;
1261
1262         priv = netdev_priv(net);
1263         priv->net = net;
1264         priv->demux = dvbnet->demux;
1265         priv->pid = pid;
1266         priv->rx_mode = RX_MODE_UNI;
1267         priv->need_pusi = 1;
1268         priv->tscc = 0;
1269         priv->feedtype = feedtype;
1270         reset_ule(priv);
1271
1272         INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1273         INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1274         mutex_init(&priv->mutex);
1275
1276         net->base_addr = pid;
1277
1278         if ((result = register_netdev(net)) < 0) {
1279                 dvbnet->device[if_num] = NULL;
1280                 free_netdev(net);
1281                 return result;
1282         }
1283         printk("dvb_net: created network interface %s\n", net->name);
1284
1285         return if_num;
1286 }
1287
1288 static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1289 {
1290         struct net_device *net = dvbnet->device[num];
1291         struct dvb_net_priv *priv;
1292
1293         if (!dvbnet->state[num])
1294                 return -EINVAL;
1295         priv = netdev_priv(net);
1296         if (priv->in_use)
1297                 return -EBUSY;
1298
1299         dvb_net_stop(net);
1300         flush_work(&priv->set_multicast_list_wq);
1301         flush_work(&priv->restart_net_feed_wq);
1302         printk("dvb_net: removed network interface %s\n", net->name);
1303         unregister_netdev(net);
1304         dvbnet->state[num]=0;
1305         dvbnet->device[num] = NULL;
1306         free_netdev(net);
1307
1308         return 0;
1309 }
1310
1311 static int dvb_net_do_ioctl(struct file *file,
1312                   unsigned int cmd, void *parg)
1313 {
1314         struct dvb_device *dvbdev = file->private_data;
1315         struct dvb_net *dvbnet = dvbdev->priv;
1316         int ret = 0;
1317
1318         if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1319                 return -EPERM;
1320
1321         if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1322                 return -ERESTARTSYS;
1323
1324         switch (cmd) {
1325         case NET_ADD_IF:
1326         {
1327                 struct dvb_net_if *dvbnetif = parg;
1328                 int result;
1329
1330                 if (!capable(CAP_SYS_ADMIN)) {
1331                         ret = -EPERM;
1332                         goto ioctl_error;
1333                 }
1334
1335                 if (!try_module_get(dvbdev->adapter->module)) {
1336                         ret = -EPERM;
1337                         goto ioctl_error;
1338                 }
1339
1340                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1341                 if (result<0) {
1342                         module_put(dvbdev->adapter->module);
1343                         ret = result;
1344                         goto ioctl_error;
1345                 }
1346                 dvbnetif->if_num=result;
1347                 break;
1348         }
1349         case NET_GET_IF:
1350         {
1351                 struct net_device *netdev;
1352                 struct dvb_net_priv *priv_data;
1353                 struct dvb_net_if *dvbnetif = parg;
1354                 int if_num = dvbnetif->if_num;
1355
1356                 if (if_num >= DVB_NET_DEVICES_MAX) {
1357                         ret = -EINVAL;
1358                         goto ioctl_error;
1359                 }
1360                 if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1361
1362                 if (!dvbnet->state[if_num]) {
1363                         ret = -EINVAL;
1364                         goto ioctl_error;
1365                 }
1366
1367                 netdev = dvbnet->device[if_num];
1368
1369                 priv_data = netdev_priv(netdev);
1370                 dvbnetif->pid=priv_data->pid;
1371                 dvbnetif->feedtype=priv_data->feedtype;
1372                 break;
1373         }
1374         case NET_REMOVE_IF:
1375         {
1376                 if (!capable(CAP_SYS_ADMIN)) {
1377                         ret = -EPERM;
1378                         goto ioctl_error;
1379                 }
1380                 if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1381                         ret = -EINVAL;
1382                         goto ioctl_error;
1383                 }
1384                 ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1385                 if (!ret)
1386                         module_put(dvbdev->adapter->module);
1387                 break;
1388         }
1389
1390         /* binary compatibility cruft */
1391         case __NET_ADD_IF_OLD:
1392         {
1393                 struct __dvb_net_if_old *dvbnetif = parg;
1394                 int result;
1395
1396                 if (!capable(CAP_SYS_ADMIN)) {
1397                         ret = -EPERM;
1398                         goto ioctl_error;
1399                 }
1400
1401                 if (!try_module_get(dvbdev->adapter->module)) {
1402                         ret = -EPERM;
1403                         goto ioctl_error;
1404                 }
1405
1406                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1407                 if (result<0) {
1408                         module_put(dvbdev->adapter->module);
1409                         ret = result;
1410                         goto ioctl_error;
1411                 }
1412                 dvbnetif->if_num=result;
1413                 break;
1414         }
1415         case __NET_GET_IF_OLD:
1416         {
1417                 struct net_device *netdev;
1418                 struct dvb_net_priv *priv_data;
1419                 struct __dvb_net_if_old *dvbnetif = parg;
1420                 int if_num = dvbnetif->if_num;
1421
1422                 if (if_num >= DVB_NET_DEVICES_MAX) {
1423                         ret = -EINVAL;
1424                         goto ioctl_error;
1425                 }
1426                 if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1427
1428                 if (!dvbnet->state[if_num]) {
1429                         ret = -EINVAL;
1430                         goto ioctl_error;
1431                 }
1432
1433                 netdev = dvbnet->device[if_num];
1434
1435                 priv_data = netdev_priv(netdev);
1436                 dvbnetif->pid=priv_data->pid;
1437                 break;
1438         }
1439         default:
1440                 ret = -ENOTTY;
1441                 break;
1442         }
1443
1444 ioctl_error:
1445         mutex_unlock(&dvbnet->ioctl_mutex);
1446         return ret;
1447 }
1448
1449 static long dvb_net_ioctl(struct file *file,
1450               unsigned int cmd, unsigned long arg)
1451 {
1452         return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1453 }
1454
1455 static int dvb_net_close(struct inode *inode, struct file *file)
1456 {
1457         struct dvb_device *dvbdev = file->private_data;
1458         struct dvb_net *dvbnet = dvbdev->priv;
1459
1460         dvb_generic_release(inode, file);
1461
1462         if(dvbdev->users == 1 && dvbnet->exit == 1)
1463                 wake_up(&dvbdev->wait_queue);
1464         return 0;
1465 }
1466
1467
1468 static const struct file_operations dvb_net_fops = {
1469         .owner = THIS_MODULE,
1470         .unlocked_ioctl = dvb_net_ioctl,
1471         .open = dvb_generic_open,
1472         .release = dvb_net_close,
1473         .llseek = noop_llseek,
1474 };
1475
1476 static const struct dvb_device dvbdev_net = {
1477         .priv = NULL,
1478         .users = 1,
1479         .writers = 1,
1480 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1481         .name = "dvb-net",
1482 #endif
1483         .fops = &dvb_net_fops,
1484 };
1485
1486 void dvb_net_release (struct dvb_net *dvbnet)
1487 {
1488         int i;
1489
1490         dvbnet->exit = 1;
1491         if (dvbnet->dvbdev->users < 1)
1492                 wait_event(dvbnet->dvbdev->wait_queue,
1493                                 dvbnet->dvbdev->users==1);
1494
1495         dvb_unregister_device(dvbnet->dvbdev);
1496
1497         for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1498                 if (!dvbnet->state[i])
1499                         continue;
1500                 dvb_net_remove_if(dvbnet, i);
1501         }
1502 }
1503 EXPORT_SYMBOL(dvb_net_release);
1504
1505
1506 int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1507                   struct dmx_demux *dmx)
1508 {
1509         int i;
1510
1511         mutex_init(&dvbnet->ioctl_mutex);
1512         dvbnet->demux = dmx;
1513
1514         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1515                 dvbnet->state[i] = 0;
1516
1517         return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1518                              dvbnet, DVB_DEVICE_NET);
1519 }
1520 EXPORT_SYMBOL(dvb_net_init);