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  * To obtain the license, point your browser to
  27  * http://www.gnu.org/copyleft/gpl.html
  28  */
  29
  30 /*
  31  * ULE ChangeLog:
  32  * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
  33  *
  34  * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
  35  *                       ULE Extension header handling.
  36  *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
  37  *                       Fraunhofer Institute for Open Communication Systems
  38  *                       Competence Center for Advanced Satellite Communications.
  39  *                     Bugfixes and robustness improvements.
  40  *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
  41  *                     DVB_ULE_DEBUG compile-time option.
  42  * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
  43  *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
  44  *                       Paris Lodron University of Salzburg.
  45  */
  46
  47 /*
  48  * FIXME / TODO (dvb_net.c):
  49  *
  50  * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
  51  *
  52  */
  53
  54 #define pr_fmt(fmt) "dvb_net: " fmt
  55
  56 #include <linux/module.h>
  57 #include <linux/kernel.h>
  58 #include <linux/netdevice.h>
  59 #include <linux/etherdevice.h>
  60 #include <linux/dvb/net.h>
  61 #include <linux/uio.h>
  62 #include <linux/uaccess.h>
  63 #include <linux/crc32.h>
  64 #include <linux/mutex.h>
  65 #include <linux/sched.h>
  66
  67 #include <media/dvb_demux.h>
  68 #include <media/dvb_net.h>
  69
  70 static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
  71 {
  72         unsigned int j;
  73         for (j = 0; j < cnt; j++)
  74                 c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
  75         return c;
  76 }
  77
  78
  79 #define DVB_NET_MULTICAST_MAX 10
  80
  81 #ifdef DVB_ULE_DEBUG
  82 /*
  83  * The code inside DVB_ULE_DEBUG keeps a history of the
  84  * last 100 TS cells processed.
  85  */
  86 static unsigned char ule_hist[100*TS_SZ] = { 0 };
  87 static unsigned char *ule_where = ule_hist, ule_dump;
  88
  89 static void hexdump(const unsigned char *buf, unsigned short len)
  90 {
  91         print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  92 }
  93 #endif
  94
  95 struct dvb_net_priv {
  96         int in_use;
  97         u16 pid;
  98         struct net_device *net;
  99         struct dvb_net *host;
 100         struct dmx_demux *demux;
 101         struct dmx_section_feed *secfeed;
 102         struct dmx_section_filter *secfilter;
 103         struct dmx_ts_feed *tsfeed;
 104         int multi_num;
 105         struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
 106         unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
 107         int rx_mode;
 108 #define RX_MODE_UNI 0
 109 #define RX_MODE_MULTI 1
 110 #define RX_MODE_ALL_MULTI 2
 111 #define RX_MODE_PROMISC 3
 112         struct work_struct set_multicast_list_wq;
 113         struct work_struct restart_net_feed_wq;
 114         unsigned char feedtype;                 /* Either FEED_TYPE_ or FEED_TYPE_ULE */
 115         int need_pusi;                          /* Set to 1, if synchronization on PUSI required. */
 116         unsigned char tscc;                     /* TS continuity counter after sync on PUSI. */
 117         struct sk_buff *ule_skb;                /* ULE SNDU decodes into this buffer. */
 118         unsigned char *ule_next_hdr;            /* Pointer into skb to next ULE extension header. */
 119         unsigned short ule_sndu_len;            /* ULE SNDU length in bytes, w/o D-Bit. */
 120         unsigned short ule_sndu_type;           /* ULE SNDU type field, complete. */
 121         unsigned char ule_sndu_type_1;          /* ULE SNDU type field, if split across 2 TS cells. */
 122         unsigned char ule_dbit;                 /* Whether the DestMAC address present
 123                                                  * or not (bit is set). */
 124         unsigned char ule_bridged;              /* Whether the ULE_BRIDGED extension header was found. */
 125         int ule_sndu_remain;                    /* Nr. of bytes still required for current ULE SNDU. */
 126         unsigned long ts_count;                 /* Current ts cell counter. */
 127         struct mutex mutex;
 128 };
 129
 130
 131 /*
 132  *      Determine the packet's protocol ID. The rule here is that we
 133  *      assume 802.3 if the type field is short enough to be a length.
 134  *      This is normal practice and works for any 'now in use' protocol.
 135  *
 136  *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 137  *  by Michael Holzt <kju@debian.org>
 138  */
 139 static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 140                                       struct net_device *dev)
 141 {
 142         struct ethhdr *eth;
 143         unsigned char *rawp;
 144
 145         skb_reset_mac_header(skb);
 146         skb_pull(skb,dev->hard_header_len);
 147         eth = eth_hdr(skb);
 148
 149         if (*eth->h_dest & 1) {
 150                 if(ether_addr_equal(eth->h_dest,dev->broadcast))
 151                         skb->pkt_type=PACKET_BROADCAST;
 152                 else
 153                         skb->pkt_type=PACKET_MULTICAST;
 154         }
 155
 156         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 157                 return eth->h_proto;
 158
 159         rawp = skb->data;
 160
 161         /*
 162          *      This is a magic hack to spot IPX packets. Older Novell breaks
 163          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
 164          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 165          *      won't work for fault tolerant netware but does for the rest.
 166          */
 167         if (*(unsigned short *)rawp == 0xFFFF)
 168                 return htons(ETH_P_802_3);
 169
 170         /*
 171          *      Real 802.2 LLC
 172          */
 173         return htons(ETH_P_802_2);
 174 }
 175
 176 #define TS_SZ   188
 177 #define TS_SYNC 0x47
 178 #define TS_TEI  0x80
 179 #define TS_SC   0xC0
 180 #define TS_PUSI 0x40
 181 #define TS_AF_A 0x20
 182 #define TS_AF_D 0x10
 183
 184 /* ULE Extension Header handlers. */
 185
 186 #define ULE_TEST        0
 187 #define ULE_BRIDGED     1
 188
 189 #define ULE_OPTEXTHDR_PADDING 0
 190
 191 static int ule_test_sndu( struct dvb_net_priv *p )
 192 {
 193         return -1;
 194 }
 195
 196 static int ule_bridged_sndu( struct dvb_net_priv *p )
 197 {
 198         struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
 199         if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 200                 int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
 201                 /* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 202                 if(framelen != ntohs(hdr->h_proto)) {
 203                         return -1;
 204                 }
 205         }
 206         /* Note:
 207          * From RFC4326:
 208          *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
 209          *   It must be the final (or only) extension header specified in the header chain of a SNDU."
 210          * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
 211          */
 212         p->ule_bridged = 1;
 213         return 0;
 214 }
 215
 216 static int ule_exthdr_padding(struct dvb_net_priv *p)
 217 {
 218         return 0;
 219 }
 220
 221 /*
 222  * Handle ULE extension headers.
 223  *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 224  *  Returns: >= 0: nr. of bytes consumed by next extension header
 225  *           -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 226  */
 227 static int handle_one_ule_extension( struct dvb_net_priv *p )
 228 {
 229         /* Table of mandatory extension header handlers.  The header type is the index. */
 230         static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
 231                 { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
 232
 233         /* Table of optional extension header handlers.  The header type is the index. */
 234         static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
 235                 { [0] = ule_exthdr_padding, [1] = NULL, };
 236
 237         int ext_len = 0;
 238         unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
 239         unsigned char htype = p->ule_sndu_type & 0x00FF;
 240
 241         /* Discriminate mandatory and optional extension headers. */
 242         if (hlen == 0) {
 243                 /* Mandatory extension header */
 244                 if (ule_mandatory_ext_handlers[htype]) {
 245                         ext_len = ule_mandatory_ext_handlers[htype]( p );
 246                         if(ext_len >= 0) {
 247                                 p->ule_next_hdr += ext_len;
 248                                 if (!p->ule_bridged) {
 249                                         p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
 250                                         p->ule_next_hdr += 2;
 251                                 } else {
 252                                         p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
 253                                         /* This assures the extension handling loop will terminate. */
 254                                 }
 255                         }
 256                         // else: extension handler failed or SNDU should be discarded
 257                 } else
 258                         ext_len = -1;   /* SNDU has to be discarded. */
 259         } else {
 260                 /* Optional extension header.  Calculate the length. */
 261                 ext_len = hlen << 1;
 262                 /* Process the optional extension header according to its type. */
 263                 if (ule_optional_ext_handlers[htype])
 264                         (void)ule_optional_ext_handlers[htype]( p );
 265                 p->ule_next_hdr += ext_len;
 266                 p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
 267                 /*
 268                  * note: the length of the next header type is included in the
 269                  * length of THIS optional extension header
 270                  */
 271         }
 272
 273         return ext_len;
 274 }
 275
 276 static int handle_ule_extensions( struct dvb_net_priv *p )
 277 {
 278         int total_ext_len = 0, l;
 279
 280         p->ule_next_hdr = p->ule_skb->data;
 281         do {
 282                 l = handle_one_ule_extension( p );
 283                 if (l < 0)
 284                         return l;       /* Stop extension header processing and discard SNDU. */
 285                 total_ext_len += l;
 286                 pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
 287                          p->ule_next_hdr, (int)p->ule_sndu_type,
 288                          l, total_ext_len);
 289
 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
 314 struct dvb_net_ule_handle {
 315         struct net_device *dev;
 316         struct dvb_net_priv *priv;
 317         struct ethhdr *ethh;
 318         const u8 *buf;
 319         size_t buf_len;
 320         unsigned long skipped;
 321         const u8 *ts, *ts_end, *from_where;
 322         u8 ts_remain, how_much, new_ts;
 323         bool error;
 324 };
 325
 326 static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
 327 {
 328         /* We are about to process a new TS cell. */
 329
 330 #ifdef DVB_ULE_DEBUG
 331         if (ule_where >= &ule_hist[100*TS_SZ])
 332                 ule_where = ule_hist;
 333         memcpy(ule_where, h->ts, TS_SZ);
 334         if (ule_dump) {
 335                 hexdump(ule_where, TS_SZ);
 336                 ule_dump = 0;
 337         }
 338         ule_where += TS_SZ;
 339 #endif
 340
 341         /*
 342          * Check TS h->error conditions: sync_byte, transport_error_indicator,
 343          * scrambling_control .
 344          */
 345         if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
 346             ((h->ts[3] & TS_SC) != 0)) {
 347                 pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
 348                         h->priv->ts_count, h->ts[0],
 349                         (h->ts[1] & TS_TEI) >> 7,
 350                         (h->ts[3] & TS_SC) >> 6);
 351
 352                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 353                 if (h->priv->ule_skb) {
 354                         dev_kfree_skb(h->priv->ule_skb);
 355                         /* Prepare for next SNDU. */
 356                         h->dev->stats.rx_errors++;
 357                         h->dev->stats.rx_frame_errors++;
 358                 }
 359                 reset_ule(h->priv);
 360                 h->priv->need_pusi = 1;
 361
 362                 /* Continue with next TS cell. */
 363                 h->ts += TS_SZ;
 364                 h->priv->ts_count++;
 365                 return 1;
 366         }
 367
 368         h->ts_remain = 184;
 369         h->from_where = h->ts + 4;
 370
 371         return 0;
 372 }
 373
 374 static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
 375 {
 376         if (h->ts[1] & TS_PUSI) {
 377                 /* Find beginning of first ULE SNDU in current TS cell. */
 378                 /* Synchronize continuity counter. */
 379                 h->priv->tscc = h->ts[3] & 0x0F;
 380                 /* There is a pointer field here. */
 381                 if (h->ts[4] > h->ts_remain) {
 382                         pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
 383                                 h->priv->ts_count, h->ts[4]);
 384                         h->ts += TS_SZ;
 385                         h->priv->ts_count++;
 386                         return 1;
 387                 }
 388                 /* Skip to destination of pointer field. */
 389                 h->from_where = &h->ts[5] + h->ts[4];
 390                 h->ts_remain -= 1 + h->ts[4];
 391                 h->skipped = 0;
 392         } else {
 393                 h->skipped++;
 394                 h->ts += TS_SZ;
 395                 h->priv->ts_count++;
 396                 return 1;
 397         }
 398
 399         return 0;
 400 }
 401
 402 static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
 403 {
 404         /* Check continuity counter. */
 405         if ((h->ts[3] & 0x0F) == h->priv->tscc)
 406                 h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
 407         else {
 408                 /* TS discontinuity handling: */
 409                 pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
 410                         h->priv->ts_count, h->ts[3] & 0x0F,
 411                         h->priv->tscc);
 412                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 413                 if (h->priv->ule_skb) {
 414                         dev_kfree_skb(h->priv->ule_skb);
 415                         /* Prepare for next SNDU. */
 416                         // reset_ule(h->priv);  moved to below.
 417                         h->dev->stats.rx_errors++;
 418                         h->dev->stats.rx_frame_errors++;
 419                 }
 420                 reset_ule(h->priv);
 421                 /* skip to next PUSI. */
 422                 h->priv->need_pusi = 1;
 423                 return 1;
 424         }
 425         /*
 426          * If we still have an incomplete payload, but PUSI is
 427          * set; some TS cells are missing.
 428          * This is only possible here, if we missed exactly 16 TS
 429          * cells (continuity counter wrap).
 430          */
 431         if (h->ts[1] & TS_PUSI) {
 432                 if (!h->priv->need_pusi) {
 433                         if (!(*h->from_where < (h->ts_remain-1)) ||
 434                             *h->from_where != h->priv->ule_sndu_remain) {
 435                                 /*
 436                                  * Pointer field is invalid.
 437                                  * Drop this TS cell and any started ULE SNDU.
 438                                  */
 439                                 pr_warn("%lu: Invalid pointer field: %u.\n",
 440                                         h->priv->ts_count,
 441                                         *h->from_where);
 442
 443                                 /*
 444                                  * Drop partly decoded SNDU, reset state,
 445                                  * resync on PUSI.
 446                                  */
 447                                 if (h->priv->ule_skb) {
 448                                         h->error = true;
 449                                         dev_kfree_skb(h->priv->ule_skb);
 450                                 }
 451
 452                                 if (h->error || h->priv->ule_sndu_remain) {
 453                                         h->dev->stats.rx_errors++;
 454                                         h->dev->stats.rx_frame_errors++;
 455                                         h->error = false;
 456                                 }
 457
 458                                 reset_ule(h->priv);
 459                                 h->priv->need_pusi = 1;
 460                                 return 1;
 461                         }
 462                         /*
 463                          * Skip pointer field (we're processing a
 464                          * packed payload).
 465                          */
 466                         h->from_where += 1;
 467                         h->ts_remain -= 1;
 468                 } else
 469                         h->priv->need_pusi = 0;
 470
 471                 if (h->priv->ule_sndu_remain > 183) {
 472                         /*
 473                          * Current SNDU lacks more data than there
 474                          * could be available in the current TS cell.
 475                          */
 476                         h->dev->stats.rx_errors++;
 477                         h->dev->stats.rx_length_errors++;
 478                         pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d).  Flushing incomplete payload.\n",
 479                                 h->priv->ts_count,
 480                                 h->priv->ule_sndu_remain,
 481                                 h->ts[4], h->ts_remain);
 482                         dev_kfree_skb(h->priv->ule_skb);
 483                         /* Prepare for next SNDU. */
 484                         reset_ule(h->priv);
 485                         /*
 486                          * Resync: go to where pointer field points to:
 487                          * start of next ULE SNDU.
 488                          */
 489                         h->from_where += h->ts[4];
 490                         h->ts_remain -= h->ts[4];
 491                 }
 492         }
 493         return 0;
 494 }
 495
 496
 497 /*
 498  * Start a new payload with skb.
 499  * Find ULE header.  It is only guaranteed that the
 500  * length field (2 bytes) is contained in the current
 501  * TS.
 502  * Check h.ts_remain has to be >= 2 here.
 503  */
 504 static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
 505 {
 506         if (h->ts_remain < 2) {
 507                 pr_warn("Invalid payload packing: only %d bytes left in TS.  Resyncing.\n",
 508                         h->ts_remain);
 509                 h->priv->ule_sndu_len = 0;
 510                 h->priv->need_pusi = 1;
 511                 h->ts += TS_SZ;
 512                 return 1;
 513         }
 514
 515         if (!h->priv->ule_sndu_len) {
 516                 /* Got at least two bytes, thus extrace the SNDU length. */
 517                 h->priv->ule_sndu_len = h->from_where[0] << 8 |
 518                                         h->from_where[1];
 519                 if (h->priv->ule_sndu_len & 0x8000) {
 520                         /* D-Bit is set: no dest mac present. */
 521                         h->priv->ule_sndu_len &= 0x7FFF;
 522                         h->priv->ule_dbit = 1;
 523                 } else
 524                         h->priv->ule_dbit = 0;
 525
 526                 if (h->priv->ule_sndu_len < 5) {
 527                         pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
 528                                 h->priv->ts_count,
 529                                 h->priv->ule_sndu_len);
 530                         h->dev->stats.rx_errors++;
 531                         h->dev->stats.rx_length_errors++;
 532                         h->priv->ule_sndu_len = 0;
 533                         h->priv->need_pusi = 1;
 534                         h->new_ts = 1;
 535                         h->ts += TS_SZ;
 536                         h->priv->ts_count++;
 537                         return 1;
 538                 }
 539                 h->ts_remain -= 2;      /* consume the 2 bytes SNDU length. */
 540                 h->from_where += 2;
 541         }
 542
 543         h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
 544         /*
 545          * State of current TS:
 546          *   h->ts_remain (remaining bytes in the current TS cell)
 547          *   0  ule_type is not available now, we need the next TS cell
 548          *   1  the first byte of the ule_type is present
 549          * >=2  full ULE header present, maybe some payload data as well.
 550          */
 551         switch (h->ts_remain) {
 552         case 1:
 553                 h->priv->ule_sndu_remain--;
 554                 h->priv->ule_sndu_type = h->from_where[0] << 8;
 555
 556                 /* first byte of ule_type is set. */
 557                 h->priv->ule_sndu_type_1 = 1;
 558                 h->ts_remain -= 1;
 559                 h->from_where += 1;
 560                 /* fallthrough */
 561         case 0:
 562                 h->new_ts = 1;
 563                 h->ts += TS_SZ;
 564                 h->priv->ts_count++;
 565                 return 1;
 566
 567         default: /* complete ULE header is present in current TS. */
 568                 /* Extract ULE type field. */
 569                 if (h->priv->ule_sndu_type_1) {
 570                         h->priv->ule_sndu_type_1 = 0;
 571                         h->priv->ule_sndu_type |= h->from_where[0];
 572                         h->from_where += 1; /* points to payload start. */
 573                         h->ts_remain -= 1;
 574                 } else {
 575                         /* Complete type is present in new TS. */
 576                         h->priv->ule_sndu_type = h->from_where[0] << 8 |
 577                                                  h->from_where[1];
 578                         h->from_where += 2; /* points to payload start. */
 579                         h->ts_remain -= 2;
 580                 }
 581                 break;
 582         }
 583
 584         /*
 585          * Allocate the skb (decoder target buffer) with the correct size,
 586          * as follows:
 587          *
 588          * prepare for the largest case: bridged SNDU with MAC address
 589          * (dbit = 0).
 590          */
 591         h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
 592                                          ETH_HLEN + ETH_ALEN);
 593         if (!h->priv->ule_skb) {
 594                 pr_notice("%s: Memory squeeze, dropping packet.\n",
 595                           h->dev->name);
 596                 h->dev->stats.rx_dropped++;
 597                 return -1;
 598         }
 599
 600         /* This includes the CRC32 _and_ dest mac, if !dbit. */
 601         h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
 602         h->priv->ule_skb->dev = h->dev;
 603         /*
 604          * Leave space for Ethernet or bridged SNDU header
 605          * (eth hdr plus one MAC addr).
 606          */
 607         skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
 608
 609         return 0;
 610 }
 611
 612
 613 static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
 614 {
 615         static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
 616
 617         /*
 618          * The destination MAC address is the next data in the skb.  It comes
 619          * before any extension headers.
 620          *
 621          * Check if the payload of this SNDU should be passed up the stack.
 622          */
 623         if (h->priv->rx_mode == RX_MODE_PROMISC)
 624                 return 0;
 625
 626         if (h->priv->ule_skb->data[0] & 0x01) {
 627                 /* multicast or broadcast */
 628                 if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
 629                         /* multicast */
 630                         if (h->priv->rx_mode == RX_MODE_MULTI) {
 631                                 int i;
 632
 633                                 for (i = 0; i < h->priv->multi_num &&
 634                                      !ether_addr_equal(h->priv->ule_skb->data,
 635                                                        h->priv->multi_macs[i]);
 636                                      i++)
 637                                         ;
 638                                 if (i == h->priv->multi_num)
 639                                         return 1;
 640                         } else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
 641                                 return 1; /* no broadcast; */
 642                         /*
 643                          * else:
 644                          * all multicast mode: accept all multicast packets
 645                          */
 646                 }
 647                 /* else: broadcast */
 648         } else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
 649                 return 1;
 650
 651         return 0;
 652 }
 653
 654
 655 static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
 656                                   struct kvec iov[3],
 657                                   u32 ule_crc, u32 expected_crc)
 658 {
 659         u8 dest_addr[ETH_ALEN];
 660
 661         if (ule_crc != expected_crc) {
 662                 pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
 663                         h->priv->ts_count, ule_crc, expected_crc,
 664                         h->priv->ule_sndu_len, h->priv->ule_sndu_type,
 665                         h->ts_remain,
 666                         h->ts_remain > 2 ?
 667                                 *(unsigned short *)h->from_where : 0);
 668
 669         #ifdef DVB_ULE_DEBUG
 670                 hexdump(iov[0].iov_base, iov[0].iov_len);
 671                 hexdump(iov[1].iov_base, iov[1].iov_len);
 672                 hexdump(iov[2].iov_base, iov[2].iov_len);
 673
 674                 if (ule_where == ule_hist) {
 675                         hexdump(&ule_hist[98*TS_SZ], TS_SZ);
 676                         hexdump(&ule_hist[99*TS_SZ], TS_SZ);
 677                 } else if (ule_where == &ule_hist[TS_SZ]) {
 678                         hexdump(&ule_hist[99*TS_SZ], TS_SZ);
 679                         hexdump(ule_hist, TS_SZ);
 680                 } else {
 681                         hexdump(ule_where - TS_SZ - TS_SZ, TS_SZ);
 682                         hexdump(ule_where - TS_SZ, TS_SZ);
 683                 }
 684                 ule_dump = 1;
 685         #endif
 686
 687                 h->dev->stats.rx_errors++;
 688                 h->dev->stats.rx_crc_errors++;
 689                 dev_kfree_skb(h->priv->ule_skb);
 690
 691                 return;
 692         }
 693
 694         /* CRC32 verified OK. */
 695
 696         /* CRC32 was OK, so remove it from skb. */
 697         h->priv->ule_skb->tail -= 4;
 698         h->priv->ule_skb->len -= 4;
 699
 700         if (!h->priv->ule_dbit) {
 701                 if (dvb_net_ule_should_drop(h)) {
 702                         netdev_dbg(h->dev,
 703                                    "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
 704                                    h->priv->ule_skb->data, h->dev->dev_addr);
 705                         dev_kfree_skb(h->priv->ule_skb);
 706                         return;
 707                 }
 708
 709                 skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
 710                                           ETH_ALEN);
 711                 skb_pull(h->priv->ule_skb, ETH_ALEN);
 712         } else {
 713                 /* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
 714                 eth_zero_addr(dest_addr);
 715         }
 716
 717         /* Handle ULE Extension Headers. */
 718         if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
 719                 /* There is an extension header.  Handle it accordingly. */
 720                 int l = handle_ule_extensions(h->priv);
 721
 722                 if (l < 0) {
 723                         /*
 724                          * Mandatory extension header unknown or TEST SNDU.
 725                          * Drop it.
 726                          */
 727
 728                         // pr_warn("Dropping SNDU, extension headers.\n" );
 729                         dev_kfree_skb(h->priv->ule_skb);
 730                         return;
 731                 }
 732                 skb_pull(h->priv->ule_skb, l);
 733         }
 734
 735         /*
 736          * Construct/assure correct ethernet header.
 737          * Note: in bridged mode (h->priv->ule_bridged != 0)
 738          * we already have the (original) ethernet
 739          * header at the start of the payload (after
 740          * optional dest. address and any extension
 741          * headers).
 742          */
 743         if (!h->priv->ule_bridged) {
 744                 skb_push(h->priv->ule_skb, ETH_HLEN);
 745                 h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
 746                 memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
 747                 eth_zero_addr(h->ethh->h_source);
 748                 h->ethh->h_proto = htons(h->priv->ule_sndu_type);
 749         }
 750         /* else:  skb is in correct state; nothing to do. */
 751         h->priv->ule_bridged = 0;
 752
 753         /* Stuff into kernel's protocol stack. */
 754         h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
 755                                                            h->dev);
 756         /*
 757          * If D-bit is set (i.e. destination MAC address not present),
 758          * receive the packet anyhow.
 759          */
 760 #if 0
 761         if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
 762                 h->priv->ule_skb->pkt_type = PACKET_HOST;
 763 #endif
 764         h->dev->stats.rx_packets++;
 765         h->dev->stats.rx_bytes += h->priv->ule_skb->len;
 766         netif_rx(h->priv->ule_skb);
 767 }
 768
 769 static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
 770 {
 771         int ret;
 772         struct dvb_net_ule_handle h = {
 773                 .dev = dev,
 774                 .priv = netdev_priv(dev),
 775                 .ethh = NULL,
 776                 .buf = buf,
 777                 .buf_len = buf_len,
 778                 .skipped = 0L,
 779                 .ts = NULL,
 780                 .ts_end = NULL,
 781                 .from_where = NULL,
 782                 .ts_remain = 0,
 783                 .how_much = 0,
 784                 .new_ts = 1,
 785                 .error = false,
 786         };
 787
 788         /*
 789          * For all TS cells in current buffer.
 790          * Appearently, we are called for every single TS cell.
 791          */
 792         for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
 793              h.ts < h.ts_end; /* no incr. */) {
 794                 if (h.new_ts) {
 795                         /* We are about to process a new TS cell. */
 796                         if (dvb_net_ule_new_ts_cell(&h))
 797                                 continue;
 798                 }
 799
 800                 /* Synchronize on PUSI, if required. */
 801                 if (h.priv->need_pusi) {
 802                         if (dvb_net_ule_ts_pusi(&h))
 803                                 continue;
 804                 }
 805
 806                 if (h.new_ts) {
 807                         if (dvb_net_ule_new_ts(&h))
 808                                 continue;
 809                 }
 810
 811                 /* Check if new payload needs to be started. */
 812                 if (h.priv->ule_skb == NULL) {
 813                         ret = dvb_net_ule_new_payload(&h);
 814                         if (ret < 0)
 815                                 return;
 816                         if (ret)
 817                                 continue;
 818                 }
 819
 820                 /* Copy data into our current skb. */
 821                 h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
 822                 skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
 823                 h.priv->ule_sndu_remain -= h.how_much;
 824                 h.ts_remain -= h.how_much;
 825                 h.from_where += h.how_much;
 826
 827                 /* Check for complete payload. */
 828                 if (h.priv->ule_sndu_remain <= 0) {
 829                         /* Check CRC32, we've got it in our skb already. */
 830                         __be16 ulen = htons(h.priv->ule_sndu_len);
 831                         __be16 utype = htons(h.priv->ule_sndu_type);
 832                         const u8 *tail;
 833                         struct kvec iov[3] = {
 834                                 { &ulen, sizeof ulen },
 835                                 { &utype, sizeof utype },
 836                                 { h.priv->ule_skb->data,
 837                                   h.priv->ule_skb->len - 4 }
 838                         };
 839                         u32 ule_crc = ~0L, expected_crc;
 840                         if (h.priv->ule_dbit) {
 841                                 /* Set D-bit for CRC32 verification,
 842                                  * if it was set originally. */
 843                                 ulen |= htons(0x8000);
 844                         }
 845
 846                         ule_crc = iov_crc32(ule_crc, iov, 3);
 847                         tail = skb_tail_pointer(h.priv->ule_skb);
 848                         expected_crc = *(tail - 4) << 24 |
 849                                        *(tail - 3) << 16 |
 850                                        *(tail - 2) << 8 |
 851                                        *(tail - 1);
 852
 853                         dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
 854
 855                         /* Prepare for next SNDU. */
 856                         reset_ule(h.priv);
 857                 }
 858
 859                 /* More data in current TS (look at the bytes following the CRC32)? */
 860                 if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
 861                         /* Next ULE SNDU starts right there. */
 862                         h.new_ts = 0;
 863                         h.priv->ule_skb = NULL;
 864                         h.priv->ule_sndu_type_1 = 0;
 865                         h.priv->ule_sndu_len = 0;
 866                         // pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
 867                         //      *(h.from_where + 0), *(h.from_where + 1),
 868                         //      *(h.from_where + 2), *(h.from_where + 3));
 869                         // pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
 870                         // hexdump(h.ts, 188);
 871                 } else {
 872                         h.new_ts = 1;
 873                         h.ts += TS_SZ;
 874                         h.priv->ts_count++;
 875                         if (h.priv->ule_skb == NULL) {
 876                                 h.priv->need_pusi = 1;
 877                                 h.priv->ule_sndu_type_1 = 0;
 878                                 h.priv->ule_sndu_len = 0;
 879                         }
 880                 }
 881         }       /* for all available TS cells */
 882 }
 883
 884 static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
 885                                const u8 *buffer2, size_t buffer2_len,
 886                                struct dmx_ts_feed *feed)
 887 {
 888         struct net_device *dev = feed->priv;
 889
 890         if (buffer2)
 891                 pr_warn("buffer2 not NULL: %p.\n", buffer2);
 892         if (buffer1_len > 32768)
 893                 pr_warn("length > 32k: %zu.\n", buffer1_len);
 894         /* pr_info("TS callback: %u bytes, %u TS cells @ %p.\n",
 895                   buffer1_len, buffer1_len / TS_SZ, buffer1); */
 896         dvb_net_ule(dev, buffer1, buffer1_len);
 897         return 0;
 898 }
 899
 900
 901 static void dvb_net_sec(struct net_device *dev,
 902                         const u8 *pkt, int pkt_len)
 903 {
 904         u8 *eth;
 905         struct sk_buff *skb;
 906         struct net_device_stats *stats = &dev->stats;
 907         int snap = 0;
 908
 909         /* note: pkt_len includes a 32bit checksum */
 910         if (pkt_len < 16) {
 911                 pr_warn("%s: IP/MPE packet length = %d too small.\n",
 912                         dev->name, pkt_len);
 913                 stats->rx_errors++;
 914                 stats->rx_length_errors++;
 915                 return;
 916         }
 917 /* it seems some ISPs manage to screw up here, so we have to
 918  * relax the error checks... */
 919 #if 0
 920         if ((pkt[5] & 0xfd) != 0xc1) {
 921                 /* drop scrambled or broken packets */
 922 #else
 923         if ((pkt[5] & 0x3c) != 0x00) {
 924                 /* drop scrambled */
 925 #endif
 926                 stats->rx_errors++;
 927                 stats->rx_crc_errors++;
 928                 return;
 929         }
 930         if (pkt[5] & 0x02) {
 931                 /* handle LLC/SNAP, see rfc-1042 */
 932                 if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
 933                         stats->rx_dropped++;
 934                         return;
 935                 }
 936                 snap = 8;
 937         }
 938         if (pkt[7]) {
 939                 /* FIXME: assemble datagram from multiple sections */
 940                 stats->rx_errors++;
 941                 stats->rx_frame_errors++;
 942                 return;
 943         }
 944
 945         /* we have 14 byte ethernet header (ip header follows);
 946          * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
 947          */
 948         if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
 949                 //pr_notice("%s: Memory squeeze, dropping packet.\n", dev->name);
 950                 stats->rx_dropped++;
 951                 return;
 952         }
 953         skb_reserve(skb, 2);    /* longword align L3 header */
 954         skb->dev = dev;
 955
 956         /* copy L3 payload */
 957         eth = skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
 958         memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
 959
 960         /* create ethernet header: */
 961         eth[0]=pkt[0x0b];
 962         eth[1]=pkt[0x0a];
 963         eth[2]=pkt[0x09];
 964         eth[3]=pkt[0x08];
 965         eth[4]=pkt[0x04];
 966         eth[5]=pkt[0x03];
 967
 968         eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
 969
 970         if (snap) {
 971                 eth[12] = pkt[18];
 972                 eth[13] = pkt[19];
 973         } else {
 974                 /* protocol numbers are from rfc-1700 or
 975                  * http://www.iana.org/assignments/ethernet-numbers
 976                  */
 977                 if (pkt[12] >> 4 == 6) { /* version field from IP header */
 978                         eth[12] = 0x86; /* IPv6 */
 979                         eth[13] = 0xdd;
 980                 } else {
 981                         eth[12] = 0x08; /* IPv4 */
 982                         eth[13] = 0x00;
 983                 }
 984         }
 985
 986         skb->protocol = dvb_net_eth_type_trans(skb, dev);
 987
 988         stats->rx_packets++;
 989         stats->rx_bytes+=skb->len;
 990         netif_rx(skb);
 991 }
 992
 993 static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
 994                  const u8 *buffer2, size_t buffer2_len,
 995                  struct dmx_section_filter *filter)
 996 {
 997         struct net_device *dev = filter->priv;
 998
 999         /*
1000          * we rely on the DVB API definition where exactly one complete
1001          * section is delivered in buffer1
1002          */
1003         dvb_net_sec (dev, buffer1, buffer1_len);
1004         return 0;
1005 }
1006
1007 static int dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
1008 {
1009         dev_kfree_skb(skb);
1010         return NETDEV_TX_OK;
1011 }
1012
1013 static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1014 static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
1015 static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
1016 static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1017
1018 static int dvb_net_filter_sec_set(struct net_device *dev,
1019                    struct dmx_section_filter **secfilter,
1020                    u8 *mac, u8 *mac_mask)
1021 {
1022         struct dvb_net_priv *priv = netdev_priv(dev);
1023         int ret;
1024
1025         *secfilter=NULL;
1026         ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
1027         if (ret<0) {
1028                 pr_err("%s: could not get filter\n", dev->name);
1029                 return ret;
1030         }
1031
1032         (*secfilter)->priv=(void *) dev;
1033
1034         memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
1035         memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
1036         memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
1037
1038         (*secfilter)->filter_value[0]=0x3e;
1039         (*secfilter)->filter_value[3]=mac[5];
1040         (*secfilter)->filter_value[4]=mac[4];
1041         (*secfilter)->filter_value[8]=mac[3];
1042         (*secfilter)->filter_value[9]=mac[2];
1043         (*secfilter)->filter_value[10]=mac[1];
1044         (*secfilter)->filter_value[11]=mac[0];
1045
1046         (*secfilter)->filter_mask[0] = 0xff;
1047         (*secfilter)->filter_mask[3] = mac_mask[5];
1048         (*secfilter)->filter_mask[4] = mac_mask[4];
1049         (*secfilter)->filter_mask[8] = mac_mask[3];
1050         (*secfilter)->filter_mask[9] = mac_mask[2];
1051         (*secfilter)->filter_mask[10] = mac_mask[1];
1052         (*secfilter)->filter_mask[11]=mac_mask[0];
1053
1054         netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
1055
1056         return 0;
1057 }
1058
1059 static int dvb_net_feed_start(struct net_device *dev)
1060 {
1061         int ret = 0, i;
1062         struct dvb_net_priv *priv = netdev_priv(dev);
1063         struct dmx_demux *demux = priv->demux;
1064         unsigned char *mac = (unsigned char *) dev->dev_addr;
1065
1066         netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
1067         mutex_lock(&priv->mutex);
1068         if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
1069                 pr_err("%s: BUG %d\n", __func__, __LINE__);
1070
1071         priv->secfeed=NULL;
1072         priv->secfilter=NULL;
1073         priv->tsfeed = NULL;
1074
1075         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1076                 netdev_dbg(dev, "alloc secfeed\n");
1077                 ret=demux->allocate_section_feed(demux, &priv->secfeed,
1078                                          dvb_net_sec_callback);
1079                 if (ret<0) {
1080                         pr_err("%s: could not allocate section feed\n",
1081                                dev->name);
1082                         goto error;
1083                 }
1084
1085                 ret = priv->secfeed->set(priv->secfeed, priv->pid, 1);
1086
1087                 if (ret<0) {
1088                         pr_err("%s: could not set section feed\n", dev->name);
1089                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1090                         priv->secfeed=NULL;
1091                         goto error;
1092                 }
1093
1094                 if (priv->rx_mode != RX_MODE_PROMISC) {
1095                         netdev_dbg(dev, "set secfilter\n");
1096                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
1097                 }
1098
1099                 switch (priv->rx_mode) {
1100                 case RX_MODE_MULTI:
1101                         for (i = 0; i < priv->multi_num; i++) {
1102                                 netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
1103                                 dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
1104                                                        priv->multi_macs[i], mask_normal);
1105                         }
1106                         break;
1107                 case RX_MODE_ALL_MULTI:
1108                         priv->multi_num=1;
1109                         netdev_dbg(dev, "set multi_secfilter[0]\n");
1110                         dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
1111                                                mac_allmulti, mask_allmulti);
1112                         break;
1113                 case RX_MODE_PROMISC:
1114                         priv->multi_num=0;
1115                         netdev_dbg(dev, "set secfilter\n");
1116                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
1117                         break;
1118                 }
1119
1120                 netdev_dbg(dev, "start filtering\n");
1121                 priv->secfeed->start_filtering(priv->secfeed);
1122         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1123                 ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
1124
1125                 /* we have payloads encapsulated in TS */
1126                 netdev_dbg(dev, "alloc tsfeed\n");
1127                 ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1128                 if (ret < 0) {
1129                         pr_err("%s: could not allocate ts feed\n", dev->name);
1130                         goto error;
1131                 }
1132
1133                 /* Set netdevice pointer for ts decaps callback. */
1134                 priv->tsfeed->priv = (void *)dev;
1135                 ret = priv->tsfeed->set(priv->tsfeed,
1136                                         priv->pid, /* pid */
1137                                         TS_PACKET, /* type */
1138                                         DMX_PES_OTHER, /* pes type */
1139                                         timeout    /* timeout */
1140                                         );
1141
1142                 if (ret < 0) {
1143                         pr_err("%s: could not set ts feed\n", dev->name);
1144                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1145                         priv->tsfeed = NULL;
1146                         goto error;
1147                 }
1148
1149                 netdev_dbg(dev, "start filtering\n");
1150                 priv->tsfeed->start_filtering(priv->tsfeed);
1151         } else
1152                 ret = -EINVAL;
1153
1154 error:
1155         mutex_unlock(&priv->mutex);
1156         return ret;
1157 }
1158
1159 static int dvb_net_feed_stop(struct net_device *dev)
1160 {
1161         struct dvb_net_priv *priv = netdev_priv(dev);
1162         int i, ret = 0;
1163
1164         mutex_lock(&priv->mutex);
1165         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1166                 if (priv->secfeed) {
1167                         if (priv->secfeed->is_filtering) {
1168                                 netdev_dbg(dev, "stop secfeed\n");
1169                                 priv->secfeed->stop_filtering(priv->secfeed);
1170                         }
1171
1172                         if (priv->secfilter) {
1173                                 netdev_dbg(dev, "release secfilter\n");
1174                                 priv->secfeed->release_filter(priv->secfeed,
1175                                                               priv->secfilter);
1176                                 priv->secfilter=NULL;
1177                         }
1178
1179                         for (i=0; i<priv->multi_num; i++) {
1180                                 if (priv->multi_secfilter[i]) {
1181                                         netdev_dbg(dev, "release multi_filter[%d]\n",
1182                                                    i);
1183                                         priv->secfeed->release_filter(priv->secfeed,
1184                                                                       priv->multi_secfilter[i]);
1185                                         priv->multi_secfilter[i] = NULL;
1186                                 }
1187                         }
1188
1189                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1190                         priv->secfeed = NULL;
1191                 } else
1192                         pr_err("%s: no feed to stop\n", dev->name);
1193         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1194                 if (priv->tsfeed) {
1195                         if (priv->tsfeed->is_filtering) {
1196                                 netdev_dbg(dev, "stop tsfeed\n");
1197                                 priv->tsfeed->stop_filtering(priv->tsfeed);
1198                         }
1199                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1200                         priv->tsfeed = NULL;
1201                 }
1202                 else
1203                         pr_err("%s: no ts feed to stop\n", dev->name);
1204         } else
1205                 ret = -EINVAL;
1206         mutex_unlock(&priv->mutex);
1207         return ret;
1208 }
1209
1210
1211 static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1212 {
1213         struct dvb_net_priv *priv = netdev_priv(dev);
1214
1215         if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1216                 return -ENOMEM;
1217
1218         memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1219
1220         priv->multi_num++;
1221         return 0;
1222 }
1223
1224
1225 static void wq_set_multicast_list (struct work_struct *work)
1226 {
1227         struct dvb_net_priv *priv =
1228                 container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1229         struct net_device *dev = priv->net;
1230
1231         dvb_net_feed_stop(dev);
1232         priv->rx_mode = RX_MODE_UNI;
1233         netif_addr_lock_bh(dev);
1234
1235         if (dev->flags & IFF_PROMISC) {
1236                 netdev_dbg(dev, "promiscuous mode\n");
1237                 priv->rx_mode = RX_MODE_PROMISC;
1238         } else if ((dev->flags & IFF_ALLMULTI)) {
1239                 netdev_dbg(dev, "allmulti mode\n");
1240                 priv->rx_mode = RX_MODE_ALL_MULTI;
1241         } else if (!netdev_mc_empty(dev)) {
1242                 struct netdev_hw_addr *ha;
1243
1244                 netdev_dbg(dev, "set_mc_list, %d entries\n",
1245                            netdev_mc_count(dev));
1246
1247                 priv->rx_mode = RX_MODE_MULTI;
1248                 priv->multi_num = 0;
1249
1250                 netdev_for_each_mc_addr(ha, dev)
1251                         dvb_set_mc_filter(dev, ha->addr);
1252         }
1253
1254         netif_addr_unlock_bh(dev);
1255         dvb_net_feed_start(dev);
1256 }
1257
1258
1259 static void dvb_net_set_multicast_list (struct net_device *dev)
1260 {
1261         struct dvb_net_priv *priv = netdev_priv(dev);
1262         schedule_work(&priv->set_multicast_list_wq);
1263 }
1264
1265
1266 static void wq_restart_net_feed (struct work_struct *work)
1267 {
1268         struct dvb_net_priv *priv =
1269                 container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1270         struct net_device *dev = priv->net;
1271
1272         if (netif_running(dev)) {
1273                 dvb_net_feed_stop(dev);
1274                 dvb_net_feed_start(dev);
1275         }
1276 }
1277
1278
1279 static int dvb_net_set_mac (struct net_device *dev, void *p)
1280 {
1281         struct dvb_net_priv *priv = netdev_priv(dev);
1282         struct sockaddr *addr=p;
1283
1284         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1285
1286         if (netif_running(dev))
1287                 schedule_work(&priv->restart_net_feed_wq);
1288
1289         return 0;
1290 }
1291
1292
1293 static int dvb_net_open(struct net_device *dev)
1294 {
1295         struct dvb_net_priv *priv = netdev_priv(dev);
1296
1297         priv->in_use++;
1298         dvb_net_feed_start(dev);
1299         return 0;
1300 }
1301
1302
1303 static int dvb_net_stop(struct net_device *dev)
1304 {
1305         struct dvb_net_priv *priv = netdev_priv(dev);
1306
1307         priv->in_use--;
1308         return dvb_net_feed_stop(dev);
1309 }
1310
1311 static const struct header_ops dvb_header_ops = {
1312         .create         = eth_header,
1313         .parse          = eth_header_parse,
1314 };
1315
1316
1317 static const struct net_device_ops dvb_netdev_ops = {
1318         .ndo_open               = dvb_net_open,
1319         .ndo_stop               = dvb_net_stop,
1320         .ndo_start_xmit         = dvb_net_tx,
1321         .ndo_set_rx_mode        = dvb_net_set_multicast_list,
1322         .ndo_set_mac_address    = dvb_net_set_mac,
1323         .ndo_validate_addr      = eth_validate_addr,
1324 };
1325
1326 static void dvb_net_setup(struct net_device *dev)
1327 {
1328         ether_setup(dev);
1329
1330         dev->header_ops         = &dvb_header_ops;
1331         dev->netdev_ops         = &dvb_netdev_ops;
1332         dev->mtu                = 4096;
1333         dev->max_mtu            = 4096;
1334
1335         dev->flags |= IFF_NOARP;
1336 }
1337
1338 static int get_if(struct dvb_net *dvbnet)
1339 {
1340         int i;
1341
1342         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1343                 if (!dvbnet->state[i])
1344                         break;
1345
1346         if (i == DVB_NET_DEVICES_MAX)
1347                 return -1;
1348
1349         dvbnet->state[i]=1;
1350         return i;
1351 }
1352
1353 static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1354 {
1355         struct net_device *net;
1356         struct dvb_net_priv *priv;
1357         int result;
1358         int if_num;
1359
1360         if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1361                 return -EINVAL;
1362         if ((if_num = get_if(dvbnet)) < 0)
1363                 return -EINVAL;
1364
1365         net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1366                            NET_NAME_UNKNOWN, dvb_net_setup);
1367         if (!net)
1368                 return -ENOMEM;
1369
1370         if (dvbnet->dvbdev->id)
1371                 snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1372                          dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1373         else
1374                 /* compatibility fix to keep dvb0_0 format */
1375                 snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1376                          dvbnet->dvbdev->adapter->num, if_num);
1377
1378         net->addr_len = 6;
1379         memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
1380
1381         dvbnet->device[if_num] = net;
1382
1383         priv = netdev_priv(net);
1384         priv->net = net;
1385         priv->demux = dvbnet->demux;
1386         priv->pid = pid;
1387         priv->rx_mode = RX_MODE_UNI;
1388         priv->need_pusi = 1;
1389         priv->tscc = 0;
1390         priv->feedtype = feedtype;
1391         reset_ule(priv);
1392
1393         INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1394         INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1395         mutex_init(&priv->mutex);
1396
1397         net->base_addr = pid;
1398
1399         if ((result = register_netdev(net)) < 0) {
1400                 dvbnet->device[if_num] = NULL;
1401                 free_netdev(net);
1402                 return result;
1403         }
1404         pr_info("created network interface %s\n", net->name);
1405
1406         return if_num;
1407 }
1408
1409 static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1410 {
1411         struct net_device *net = dvbnet->device[num];
1412         struct dvb_net_priv *priv;
1413
1414         if (!dvbnet->state[num])
1415                 return -EINVAL;
1416         priv = netdev_priv(net);
1417         if (priv->in_use)
1418                 return -EBUSY;
1419
1420         dvb_net_stop(net);
1421         flush_work(&priv->set_multicast_list_wq);
1422         flush_work(&priv->restart_net_feed_wq);
1423         pr_info("removed network interface %s\n", net->name);
1424         unregister_netdev(net);
1425         dvbnet->state[num]=0;
1426         dvbnet->device[num] = NULL;
1427         free_netdev(net);
1428
1429         return 0;
1430 }
1431
1432 static int dvb_net_do_ioctl(struct file *file,
1433                   unsigned int cmd, void *parg)
1434 {
1435         struct dvb_device *dvbdev = file->private_data;
1436         struct dvb_net *dvbnet = dvbdev->priv;
1437         int ret = 0;
1438
1439         if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1440                 return -EPERM;
1441
1442         if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1443                 return -ERESTARTSYS;
1444
1445         switch (cmd) {
1446         case NET_ADD_IF:
1447         {
1448                 struct dvb_net_if *dvbnetif = parg;
1449                 int result;
1450
1451                 if (!capable(CAP_SYS_ADMIN)) {
1452                         ret = -EPERM;
1453                         goto ioctl_error;
1454                 }
1455
1456                 if (!try_module_get(dvbdev->adapter->module)) {
1457                         ret = -EPERM;
1458                         goto ioctl_error;
1459                 }
1460
1461                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1462                 if (result<0) {
1463                         module_put(dvbdev->adapter->module);
1464                         ret = result;
1465                         goto ioctl_error;
1466                 }
1467                 dvbnetif->if_num=result;
1468                 break;
1469         }
1470         case NET_GET_IF:
1471         {
1472                 struct net_device *netdev;
1473                 struct dvb_net_priv *priv_data;
1474                 struct dvb_net_if *dvbnetif = parg;
1475
1476                 if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
1477                     !dvbnet->state[dvbnetif->if_num]) {
1478                         ret = -EINVAL;
1479                         goto ioctl_error;
1480                 }
1481
1482                 netdev = dvbnet->device[dvbnetif->if_num];
1483
1484                 priv_data = netdev_priv(netdev);
1485                 dvbnetif->pid=priv_data->pid;
1486                 dvbnetif->feedtype=priv_data->feedtype;
1487                 break;
1488         }
1489         case NET_REMOVE_IF:
1490         {
1491                 if (!capable(CAP_SYS_ADMIN)) {
1492                         ret = -EPERM;
1493                         goto ioctl_error;
1494                 }
1495                 if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1496                         ret = -EINVAL;
1497                         goto ioctl_error;
1498                 }
1499                 ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1500                 if (!ret)
1501                         module_put(dvbdev->adapter->module);
1502                 break;
1503         }
1504
1505         /* binary compatibility cruft */
1506         case __NET_ADD_IF_OLD:
1507         {
1508                 struct __dvb_net_if_old *dvbnetif = parg;
1509                 int result;
1510
1511                 if (!capable(CAP_SYS_ADMIN)) {
1512                         ret = -EPERM;
1513                         goto ioctl_error;
1514                 }
1515
1516                 if (!try_module_get(dvbdev->adapter->module)) {
1517                         ret = -EPERM;
1518                         goto ioctl_error;
1519                 }
1520
1521                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1522                 if (result<0) {
1523                         module_put(dvbdev->adapter->module);
1524                         ret = result;
1525                         goto ioctl_error;
1526                 }
1527                 dvbnetif->if_num=result;
1528                 break;
1529         }
1530         case __NET_GET_IF_OLD:
1531         {
1532                 struct net_device *netdev;
1533                 struct dvb_net_priv *priv_data;
1534                 struct __dvb_net_if_old *dvbnetif = parg;
1535
1536                 if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
1537                     !dvbnet->state[dvbnetif->if_num]) {
1538                         ret = -EINVAL;
1539                         goto ioctl_error;
1540                 }
1541
1542                 netdev = dvbnet->device[dvbnetif->if_num];
1543
1544                 priv_data = netdev_priv(netdev);
1545                 dvbnetif->pid=priv_data->pid;
1546                 break;
1547         }
1548         default:
1549                 ret = -ENOTTY;
1550                 break;
1551         }
1552
1553 ioctl_error:
1554         mutex_unlock(&dvbnet->ioctl_mutex);
1555         return ret;
1556 }
1557
1558 static long dvb_net_ioctl(struct file *file,
1559               unsigned int cmd, unsigned long arg)
1560 {
1561         return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1562 }
1563
1564 static int dvb_net_close(struct inode *inode, struct file *file)
1565 {
1566         struct dvb_device *dvbdev = file->private_data;
1567         struct dvb_net *dvbnet = dvbdev->priv;
1568
1569         dvb_generic_release(inode, file);
1570
1571         if(dvbdev->users == 1 && dvbnet->exit == 1)
1572                 wake_up(&dvbdev->wait_queue);
1573         return 0;
1574 }
1575
1576
1577 static const struct file_operations dvb_net_fops = {
1578         .owner = THIS_MODULE,
1579         .unlocked_ioctl = dvb_net_ioctl,
1580         .open = dvb_generic_open,
1581         .release = dvb_net_close,
1582         .llseek = noop_llseek,
1583 };
1584
1585 static const struct dvb_device dvbdev_net = {
1586         .priv = NULL,
1587         .users = 1,
1588         .writers = 1,
1589 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1590         .name = "dvb-net",
1591 #endif
1592         .fops = &dvb_net_fops,
1593 };
1594
1595 void dvb_net_release (struct dvb_net *dvbnet)
1596 {
1597         int i;
1598
1599         dvbnet->exit = 1;
1600         if (dvbnet->dvbdev->users < 1)
1601                 wait_event(dvbnet->dvbdev->wait_queue,
1602                                 dvbnet->dvbdev->users==1);
1603
1604         dvb_unregister_device(dvbnet->dvbdev);
1605
1606         for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1607                 if (!dvbnet->state[i])
1608                         continue;
1609                 dvb_net_remove_if(dvbnet, i);
1610         }
1611 }
1612 EXPORT_SYMBOL(dvb_net_release);
1613
1614
1615 int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1616                   struct dmx_demux *dmx)
1617 {
1618         int i;
1619
1620         mutex_init(&dvbnet->ioctl_mutex);
1621         dvbnet->demux = dmx;
1622
1623         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1624                 dvbnet->state[i] = 0;
1625
1626         return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1627                              dvbnet, DVB_DEVICE_NET, 0);
1628 }
1629 EXPORT_SYMBOL(dvb_net_init);