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/nospec.h>
  60 #include <linux/etherdevice.h>
  61 #include <linux/dvb/net.h>
  62 #include <linux/uio.h>
  63 #include <linux/uaccess.h>
  64 #include <linux/crc32.h>
  65 #include <linux/mutex.h>
  66 #include <linux/sched.h>
  67
  68 #include <media/dvb_demux.h>
  69 #include <media/dvb_net.h>
  70
  71 static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
  72 {
  73         unsigned int j;
  74         for (j = 0; j < cnt; j++)
  75                 c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
  76         return c;
  77 }
  78
  79
  80 #define DVB_NET_MULTICAST_MAX 10
  81
  82 #ifdef DVB_ULE_DEBUG
  83 /*
  84  * The code inside DVB_ULE_DEBUG keeps a history of the
  85  * last 100 TS cells processed.
  86  */
  87 static unsigned char ule_hist[100*TS_SZ] = { 0 };
  88 static unsigned char *ule_where = ule_hist, ule_dump;
  89
  90 static void hexdump(const unsigned char *buf, unsigned short len)
  91 {
  92         print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  93 }
  94 #endif
  95
  96 struct dvb_net_priv {
  97         int in_use;
  98         u16 pid;
  99         struct net_device *net;
 100         struct dvb_net *host;
 101         struct dmx_demux *demux;
 102         struct dmx_section_feed *secfeed;
 103         struct dmx_section_filter *secfilter;
 104         struct dmx_ts_feed *tsfeed;
 105         int multi_num;
 106         struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
 107         unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
 108         int rx_mode;
 109 #define RX_MODE_UNI 0
 110 #define RX_MODE_MULTI 1
 111 #define RX_MODE_ALL_MULTI 2
 112 #define RX_MODE_PROMISC 3
 113         struct work_struct set_multicast_list_wq;
 114         struct work_struct restart_net_feed_wq;
 115         unsigned char feedtype;                 /* Either FEED_TYPE_ or FEED_TYPE_ULE */
 116         int need_pusi;                          /* Set to 1, if synchronization on PUSI required. */
 117         unsigned char tscc;                     /* TS continuity counter after sync on PUSI. */
 118         struct sk_buff *ule_skb;                /* ULE SNDU decodes into this buffer. */
 119         unsigned char *ule_next_hdr;            /* Pointer into skb to next ULE extension header. */
 120         unsigned short ule_sndu_len;            /* ULE SNDU length in bytes, w/o D-Bit. */
 121         unsigned short ule_sndu_type;           /* ULE SNDU type field, complete. */
 122         unsigned char ule_sndu_type_1;          /* ULE SNDU type field, if split across 2 TS cells. */
 123         unsigned char ule_dbit;                 /* Whether the DestMAC address present
 124                                                  * or not (bit is set). */
 125         unsigned char ule_bridged;              /* Whether the ULE_BRIDGED extension header was found. */
 126         int ule_sndu_remain;                    /* Nr. of bytes still required for current ULE SNDU. */
 127         unsigned long ts_count;                 /* Current ts cell counter. */
 128         struct mutex mutex;
 129 };
 130
 131
 132 /*
 133  *      Determine the packet's protocol ID. The rule here is that we
 134  *      assume 802.3 if the type field is short enough to be a length.
 135  *      This is normal practice and works for any 'now in use' protocol.
 136  *
 137  *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 138  *  by Michael Holzt <kju@debian.org>
 139  */
 140 static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 141                                       struct net_device *dev)
 142 {
 143         struct ethhdr *eth;
 144         unsigned char *rawp;
 145
 146         skb_reset_mac_header(skb);
 147         skb_pull(skb,dev->hard_header_len);
 148         eth = eth_hdr(skb);
 149
 150         if (*eth->h_dest & 1) {
 151                 if(ether_addr_equal(eth->h_dest,dev->broadcast))
 152                         skb->pkt_type=PACKET_BROADCAST;
 153                 else
 154                         skb->pkt_type=PACKET_MULTICAST;
 155         }
 156
 157         if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 158                 return eth->h_proto;
 159
 160         rawp = skb->data;
 161
 162         /*
 163          *      This is a magic hack to spot IPX packets. Older Novell breaks
 164          *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
 165          *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 166          *      won't work for fault tolerant netware but does for the rest.
 167          */
 168         if (*(unsigned short *)rawp == 0xFFFF)
 169                 return htons(ETH_P_802_3);
 170
 171         /*
 172          *      Real 802.2 LLC
 173          */
 174         return htons(ETH_P_802_2);
 175 }
 176
 177 #define TS_SZ   188
 178 #define TS_SYNC 0x47
 179 #define TS_TEI  0x80
 180 #define TS_SC   0xC0
 181 #define TS_PUSI 0x40
 182 #define TS_AF_A 0x20
 183 #define TS_AF_D 0x10
 184
 185 /* ULE Extension Header handlers. */
 186
 187 #define ULE_TEST        0
 188 #define ULE_BRIDGED     1
 189
 190 #define ULE_OPTEXTHDR_PADDING 0
 191
 192 static int ule_test_sndu( struct dvb_net_priv *p )
 193 {
 194         return -1;
 195 }
 196
 197 static int ule_bridged_sndu( struct dvb_net_priv *p )
 198 {
 199         struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
 200         if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 201                 int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
 202                 /* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 203                 if(framelen != ntohs(hdr->h_proto)) {
 204                         return -1;
 205                 }
 206         }
 207         /* Note:
 208          * From RFC4326:
 209          *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
 210          *   It must be the final (or only) extension header specified in the header chain of a SNDU."
 211          * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
 212          */
 213         p->ule_bridged = 1;
 214         return 0;
 215 }
 216
 217 static int ule_exthdr_padding(struct dvb_net_priv *p)
 218 {
 219         return 0;
 220 }
 221
 222 /*
 223  * Handle ULE extension headers.
 224  *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 225  *  Returns: >= 0: nr. of bytes consumed by next extension header
 226  *           -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 227  */
 228 static int handle_one_ule_extension( struct dvb_net_priv *p )
 229 {
 230         /* Table of mandatory extension header handlers.  The header type is the index. */
 231         static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
 232                 { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
 233
 234         /* Table of optional extension header handlers.  The header type is the index. */
 235         static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
 236                 { [0] = ule_exthdr_padding, [1] = NULL, };
 237
 238         int ext_len = 0;
 239         unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
 240         unsigned char htype = p->ule_sndu_type & 0x00FF;
 241
 242         /* Discriminate mandatory and optional extension headers. */
 243         if (hlen == 0) {
 244                 /* Mandatory extension header */
 245                 if (ule_mandatory_ext_handlers[htype]) {
 246                         ext_len = ule_mandatory_ext_handlers[htype]( p );
 247                         if(ext_len >= 0) {
 248                                 p->ule_next_hdr += ext_len;
 249                                 if (!p->ule_bridged) {
 250                                         p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
 251                                         p->ule_next_hdr += 2;
 252                                 } else {
 253                                         p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
 254                                         /* This assures the extension handling loop will terminate. */
 255                                 }
 256                         }
 257                         // else: extension handler failed or SNDU should be discarded
 258                 } else
 259                         ext_len = -1;   /* SNDU has to be discarded. */
 260         } else {
 261                 /* Optional extension header.  Calculate the length. */
 262                 ext_len = hlen << 1;
 263                 /* Process the optional extension header according to its type. */
 264                 if (ule_optional_ext_handlers[htype])
 265                         (void)ule_optional_ext_handlers[htype]( p );
 266                 p->ule_next_hdr += ext_len;
 267                 p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
 268                 /*
 269                  * note: the length of the next header type is included in the
 270                  * length of THIS optional extension header
 271                  */
 272         }
 273
 274         return ext_len;
 275 }
 276
 277 static int handle_ule_extensions( struct dvb_net_priv *p )
 278 {
 279         int total_ext_len = 0, l;
 280
 281         p->ule_next_hdr = p->ule_skb->data;
 282         do {
 283                 l = handle_one_ule_extension( p );
 284                 if (l < 0)
 285                         return l;       /* Stop extension header processing and discard SNDU. */
 286                 total_ext_len += l;
 287                 pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
 288                          p->ule_next_hdr, (int)p->ule_sndu_type,
 289                          l, total_ext_len);
 290
 291         } while (p->ule_sndu_type < ETH_P_802_3_MIN);
 292
 293         return total_ext_len;
 294 }
 295
 296
 297 /* Prepare for a new ULE SNDU: reset the decoder state. */
 298 static inline void reset_ule( struct dvb_net_priv *p )
 299 {
 300         p->ule_skb = NULL;
 301         p->ule_next_hdr = NULL;
 302         p->ule_sndu_len = 0;
 303         p->ule_sndu_type = 0;
 304         p->ule_sndu_type_1 = 0;
 305         p->ule_sndu_remain = 0;
 306         p->ule_dbit = 0xFF;
 307         p->ule_bridged = 0;
 308 }
 309
 310 /*
 311  * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 312  * TS cells of a single PID.
 313  */
 314
 315 struct dvb_net_ule_handle {
 316         struct net_device *dev;
 317         struct dvb_net_priv *priv;
 318         struct ethhdr *ethh;
 319         const u8 *buf;
 320         size_t buf_len;
 321         unsigned long skipped;
 322         const u8 *ts, *ts_end, *from_where;
 323         u8 ts_remain, how_much, new_ts;
 324         bool error;
 325 };
 326
 327 static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
 328 {
 329         /* We are about to process a new TS cell. */
 330
 331 #ifdef DVB_ULE_DEBUG
 332         if (ule_where >= &ule_hist[100*TS_SZ])
 333                 ule_where = ule_hist;
 334         memcpy(ule_where, h->ts, TS_SZ);
 335         if (ule_dump) {
 336                 hexdump(ule_where, TS_SZ);
 337                 ule_dump = 0;
 338         }
 339         ule_where += TS_SZ;
 340 #endif
 341
 342         /*
 343          * Check TS h->error conditions: sync_byte, transport_error_indicator,
 344          * scrambling_control .
 345          */
 346         if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
 347             ((h->ts[3] & TS_SC) != 0)) {
 348                 pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
 349                         h->priv->ts_count, h->ts[0],
 350                         (h->ts[1] & TS_TEI) >> 7,
 351                         (h->ts[3] & TS_SC) >> 6);
 352
 353                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 354                 if (h->priv->ule_skb) {
 355                         dev_kfree_skb(h->priv->ule_skb);
 356                         /* Prepare for next SNDU. */
 357                         h->dev->stats.rx_errors++;
 358                         h->dev->stats.rx_frame_errors++;
 359                 }
 360                 reset_ule(h->priv);
 361                 h->priv->need_pusi = 1;
 362
 363                 /* Continue with next TS cell. */
 364                 h->ts += TS_SZ;
 365                 h->priv->ts_count++;
 366                 return 1;
 367         }
 368
 369         h->ts_remain = 184;
 370         h->from_where = h->ts + 4;
 371
 372         return 0;
 373 }
 374
 375 static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
 376 {
 377         if (h->ts[1] & TS_PUSI) {
 378                 /* Find beginning of first ULE SNDU in current TS cell. */
 379                 /* Synchronize continuity counter. */
 380                 h->priv->tscc = h->ts[3] & 0x0F;
 381                 /* There is a pointer field here. */
 382                 if (h->ts[4] > h->ts_remain) {
 383                         pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
 384                                 h->priv->ts_count, h->ts[4]);
 385                         h->ts += TS_SZ;
 386                         h->priv->ts_count++;
 387                         return 1;
 388                 }
 389                 /* Skip to destination of pointer field. */
 390                 h->from_where = &h->ts[5] + h->ts[4];
 391                 h->ts_remain -= 1 + h->ts[4];
 392                 h->skipped = 0;
 393         } else {
 394                 h->skipped++;
 395                 h->ts += TS_SZ;
 396                 h->priv->ts_count++;
 397                 return 1;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
 404 {
 405         /* Check continuity counter. */
 406         if ((h->ts[3] & 0x0F) == h->priv->tscc)
 407                 h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
 408         else {
 409                 /* TS discontinuity handling: */
 410                 pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
 411                         h->priv->ts_count, h->ts[3] & 0x0F,
 412                         h->priv->tscc);
 413                 /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 414                 if (h->priv->ule_skb) {
 415                         dev_kfree_skb(h->priv->ule_skb);
 416                         /* Prepare for next SNDU. */
 417                         // reset_ule(h->priv);  moved to below.
 418                         h->dev->stats.rx_errors++;
 419                         h->dev->stats.rx_frame_errors++;
 420                 }
 421                 reset_ule(h->priv);
 422                 /* skip to next PUSI. */
 423                 h->priv->need_pusi = 1;
 424                 return 1;
 425         }
 426         /*
 427          * If we still have an incomplete payload, but PUSI is
 428          * set; some TS cells are missing.
 429          * This is only possible here, if we missed exactly 16 TS
 430          * cells (continuity counter wrap).
 431          */
 432         if (h->ts[1] & TS_PUSI) {
 433                 if (!h->priv->need_pusi) {
 434                         if (!(*h->from_where < (h->ts_remain-1)) ||
 435                             *h->from_where != h->priv->ule_sndu_remain) {
 436                                 /*
 437                                  * Pointer field is invalid.
 438                                  * Drop this TS cell and any started ULE SNDU.
 439                                  */
 440                                 pr_warn("%lu: Invalid pointer field: %u.\n",
 441                                         h->priv->ts_count,
 442                                         *h->from_where);
 443
 444                                 /*
 445                                  * Drop partly decoded SNDU, reset state,
 446                                  * resync on PUSI.
 447                                  */
 448                                 if (h->priv->ule_skb) {
 449                                         h->error = true;
 450                                         dev_kfree_skb(h->priv->ule_skb);
 451                                 }
 452
 453                                 if (h->error || h->priv->ule_sndu_remain) {
 454                                         h->dev->stats.rx_errors++;
 455                                         h->dev->stats.rx_frame_errors++;
 456                                         h->error = false;
 457                                 }
 458
 459                                 reset_ule(h->priv);
 460                                 h->priv->need_pusi = 1;
 461                                 return 1;
 462                         }
 463                         /*
 464                          * Skip pointer field (we're processing a
 465                          * packed payload).
 466                          */
 467                         h->from_where += 1;
 468                         h->ts_remain -= 1;
 469                 } else
 470                         h->priv->need_pusi = 0;
 471
 472                 if (h->priv->ule_sndu_remain > 183) {
 473                         /*
 474                          * Current SNDU lacks more data than there
 475                          * could be available in the current TS cell.
 476                          */
 477                         h->dev->stats.rx_errors++;
 478                         h->dev->stats.rx_length_errors++;
 479                         pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d).  Flushing incomplete payload.\n",
 480                                 h->priv->ts_count,
 481                                 h->priv->ule_sndu_remain,
 482                                 h->ts[4], h->ts_remain);
 483                         dev_kfree_skb(h->priv->ule_skb);
 484                         /* Prepare for next SNDU. */
 485                         reset_ule(h->priv);
 486                         /*
 487                          * Resync: go to where pointer field points to:
 488                          * start of next ULE SNDU.
 489                          */
 490                         h->from_where += h->ts[4];
 491                         h->ts_remain -= h->ts[4];
 492                 }
 493         }
 494         return 0;
 495 }
 496
 497
 498 /*
 499  * Start a new payload with skb.
 500  * Find ULE header.  It is only guaranteed that the
 501  * length field (2 bytes) is contained in the current
 502  * TS.
 503  * Check h.ts_remain has to be >= 2 here.
 504  */
 505 static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
 506 {
 507         if (h->ts_remain < 2) {
 508                 pr_warn("Invalid payload packing: only %d bytes left in TS.  Resyncing.\n",
 509                         h->ts_remain);
 510                 h->priv->ule_sndu_len = 0;
 511                 h->priv->need_pusi = 1;
 512                 h->ts += TS_SZ;
 513                 return 1;
 514         }
 515
 516         if (!h->priv->ule_sndu_len) {
 517                 /* Got at least two bytes, thus extrace the SNDU length. */
 518                 h->priv->ule_sndu_len = h->from_where[0] << 8 |
 519                                         h->from_where[1];
 520                 if (h->priv->ule_sndu_len & 0x8000) {
 521                         /* D-Bit is set: no dest mac present. */
 522                         h->priv->ule_sndu_len &= 0x7FFF;
 523                         h->priv->ule_dbit = 1;
 524                 } else
 525                         h->priv->ule_dbit = 0;
 526
 527                 if (h->priv->ule_sndu_len < 5) {
 528                         pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
 529                                 h->priv->ts_count,
 530                                 h->priv->ule_sndu_len);
 531                         h->dev->stats.rx_errors++;
 532                         h->dev->stats.rx_length_errors++;
 533                         h->priv->ule_sndu_len = 0;
 534                         h->priv->need_pusi = 1;
 535                         h->new_ts = 1;
 536                         h->ts += TS_SZ;
 537                         h->priv->ts_count++;
 538                         return 1;
 539                 }
 540                 h->ts_remain -= 2;      /* consume the 2 bytes SNDU length. */
 541                 h->from_where += 2;
 542         }
 543
 544         h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
 545         /*
 546          * State of current TS:
 547          *   h->ts_remain (remaining bytes in the current TS cell)
 548          *   0  ule_type is not available now, we need the next TS cell
 549          *   1  the first byte of the ule_type is present
 550          * >=2  full ULE header present, maybe some payload data as well.
 551          */
 552         switch (h->ts_remain) {
 553         case 1:
 554                 h->priv->ule_sndu_remain--;
 555                 h->priv->ule_sndu_type = h->from_where[0] << 8;
 556
 557                 /* first byte of ule_type is set. */
 558                 h->priv->ule_sndu_type_1 = 1;
 559                 h->ts_remain -= 1;
 560                 h->from_where += 1;
 561                 /* fallthrough */
 562         case 0:
 563                 h->new_ts = 1;
 564                 h->ts += TS_SZ;
 565                 h->priv->ts_count++;
 566                 return 1;
 567
 568         default: /* complete ULE header is present in current TS. */
 569                 /* Extract ULE type field. */
 570                 if (h->priv->ule_sndu_type_1) {
 571                         h->priv->ule_sndu_type_1 = 0;
 572                         h->priv->ule_sndu_type |= h->from_where[0];
 573                         h->from_where += 1; /* points to payload start. */
 574                         h->ts_remain -= 1;
 575                 } else {
 576                         /* Complete type is present in new TS. */
 577                         h->priv->ule_sndu_type = h->from_where[0] << 8 |
 578                                                  h->from_where[1];
 579                         h->from_where += 2; /* points to payload start. */
 580                         h->ts_remain -= 2;
 581                 }
 582                 break;
 583         }
 584
 585         /*
 586          * Allocate the skb (decoder target buffer) with the correct size,
 587          * as follows:
 588          *
 589          * prepare for the largest case: bridged SNDU with MAC address
 590          * (dbit = 0).
 591          */
 592         h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
 593                                          ETH_HLEN + ETH_ALEN);
 594         if (!h->priv->ule_skb) {
 595                 pr_notice("%s: Memory squeeze, dropping packet.\n",
 596                           h->dev->name);
 597                 h->dev->stats.rx_dropped++;
 598                 return -1;
 599         }
 600
 601         /* This includes the CRC32 _and_ dest mac, if !dbit. */
 602         h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
 603         h->priv->ule_skb->dev = h->dev;
 604         /*
 605          * Leave space for Ethernet or bridged SNDU header
 606          * (eth hdr plus one MAC addr).
 607          */
 608         skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
 609
 610         return 0;
 611 }
 612
 613
 614 static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
 615 {
 616         static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
 617
 618         /*
 619          * The destination MAC address is the next data in the skb.  It comes
 620          * before any extension headers.
 621          *
 622          * Check if the payload of this SNDU should be passed up the stack.
 623          */
 624         if (h->priv->rx_mode == RX_MODE_PROMISC)
 625                 return 0;
 626
 627         if (h->priv->ule_skb->data[0] & 0x01) {
 628                 /* multicast or broadcast */
 629                 if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
 630                         /* multicast */
 631                         if (h->priv->rx_mode == RX_MODE_MULTI) {
 632                                 int i;
 633
 634                                 for (i = 0; i < h->priv->multi_num &&
 635                                      !ether_addr_equal(h->priv->ule_skb->data,
 636                                                        h->priv->multi_macs[i]);
 637                                      i++)
 638                                         ;
 639                                 if (i == h->priv->multi_num)
 640                                         return 1;
 641                         } else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
 642                                 return 1; /* no broadcast; */
 643                         /*
 644                          * else:
 645                          * all multicast mode: accept all multicast packets
 646                          */
 647                 }
 648                 /* else: broadcast */
 649         } else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
 650                 return 1;
 651
 652         return 0;
 653 }
 654
 655
 656 static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
 657                                   struct kvec iov[3],
 658                                   u32 ule_crc, u32 expected_crc)
 659 {
 660         u8 dest_addr[ETH_ALEN];
 661
 662         if (ule_crc != expected_crc) {
 663                 pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
 664                         h->priv->ts_count, ule_crc, expected_crc,
 665                         h->priv->ule_sndu_len, h->priv->ule_sndu_type,
 666                         h->ts_remain,
 667                         h->ts_remain > 2 ?
 668                                 *(unsigned short *)h->from_where : 0);
 669
 670         #ifdef DVB_ULE_DEBUG
 671                 hexdump(iov[0].iov_base, iov[0].iov_len);
 672                 hexdump(iov[1].iov_base, iov[1].iov_len);
 673                 hexdump(iov[2].iov_base, iov[2].iov_len);
 674
 675                 if (ule_where == ule_hist) {
 676                         hexdump(&ule_hist[98*TS_SZ], TS_SZ);
 677                         hexdump(&ule_hist[99*TS_SZ], TS_SZ);
 678                 } else if (ule_where == &ule_hist[TS_SZ]) {
 679                         hexdump(&ule_hist[99*TS_SZ], TS_SZ);
 680                         hexdump(ule_hist, TS_SZ);
 681                 } else {
 682                         hexdump(ule_where - TS_SZ - TS_SZ, TS_SZ);
 683                         hexdump(ule_where - TS_SZ, TS_SZ);
 684                 }
 685                 ule_dump = 1;
 686         #endif
 687
 688                 h->dev->stats.rx_errors++;
 689                 h->dev->stats.rx_crc_errors++;
 690                 dev_kfree_skb(h->priv->ule_skb);
 691
 692                 return;
 693         }
 694
 695         /* CRC32 verified OK. */
 696
 697         /* CRC32 was OK, so remove it from skb. */
 698         h->priv->ule_skb->tail -= 4;
 699         h->priv->ule_skb->len -= 4;
 700
 701         if (!h->priv->ule_dbit) {
 702                 if (dvb_net_ule_should_drop(h)) {
 703                         netdev_dbg(h->dev,
 704                                    "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
 705                                    h->priv->ule_skb->data, h->dev->dev_addr);
 706                         dev_kfree_skb(h->priv->ule_skb);
 707                         return;
 708                 }
 709
 710                 skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
 711                                           ETH_ALEN);
 712                 skb_pull(h->priv->ule_skb, ETH_ALEN);
 713         } else {
 714                 /* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
 715                 eth_zero_addr(dest_addr);
 716         }
 717
 718         /* Handle ULE Extension Headers. */
 719         if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
 720                 /* There is an extension header.  Handle it accordingly. */
 721                 int l = handle_ule_extensions(h->priv);
 722
 723                 if (l < 0) {
 724                         /*
 725                          * Mandatory extension header unknown or TEST SNDU.
 726                          * Drop it.
 727                          */
 728
 729                         // pr_warn("Dropping SNDU, extension headers.\n" );
 730                         dev_kfree_skb(h->priv->ule_skb);
 731                         return;
 732                 }
 733                 skb_pull(h->priv->ule_skb, l);
 734         }
 735
 736         /*
 737          * Construct/assure correct ethernet header.
 738          * Note: in bridged mode (h->priv->ule_bridged != 0)
 739          * we already have the (original) ethernet
 740          * header at the start of the payload (after
 741          * optional dest. address and any extension
 742          * headers).
 743          */
 744         if (!h->priv->ule_bridged) {
 745                 skb_push(h->priv->ule_skb, ETH_HLEN);
 746                 h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
 747                 memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
 748                 eth_zero_addr(h->ethh->h_source);
 749                 h->ethh->h_proto = htons(h->priv->ule_sndu_type);
 750         }
 751         /* else:  skb is in correct state; nothing to do. */
 752         h->priv->ule_bridged = 0;
 753
 754         /* Stuff into kernel's protocol stack. */
 755         h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
 756                                                            h->dev);
 757         /*
 758          * If D-bit is set (i.e. destination MAC address not present),
 759          * receive the packet anyhow.
 760          */
 761 #if 0
 762         if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
 763                 h->priv->ule_skb->pkt_type = PACKET_HOST;
 764 #endif
 765         h->dev->stats.rx_packets++;
 766         h->dev->stats.rx_bytes += h->priv->ule_skb->len;
 767         netif_rx(h->priv->ule_skb);
 768 }
 769
 770 static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
 771 {
 772         int ret;
 773         struct dvb_net_ule_handle h = {
 774                 .dev = dev,
 775                 .priv = netdev_priv(dev),
 776                 .ethh = NULL,
 777                 .buf = buf,
 778                 .buf_len = buf_len,
 779                 .skipped = 0L,
 780                 .ts = NULL,
 781                 .ts_end = NULL,
 782                 .from_where = NULL,
 783                 .ts_remain = 0,
 784                 .how_much = 0,
 785                 .new_ts = 1,
 786                 .error = false,
 787         };
 788
 789         /*
 790          * For all TS cells in current buffer.
 791          * Appearently, we are called for every single TS cell.
 792          */
 793         for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
 794              h.ts < h.ts_end; /* no incr. */) {
 795                 if (h.new_ts) {
 796                         /* We are about to process a new TS cell. */
 797                         if (dvb_net_ule_new_ts_cell(&h))
 798                                 continue;
 799                 }
 800
 801                 /* Synchronize on PUSI, if required. */
 802                 if (h.priv->need_pusi) {
 803                         if (dvb_net_ule_ts_pusi(&h))
 804                                 continue;
 805                 }
 806
 807                 if (h.new_ts) {
 808                         if (dvb_net_ule_new_ts(&h))
 809                                 continue;
 810                 }
 811
 812                 /* Check if new payload needs to be started. */
 813                 if (h.priv->ule_skb == NULL) {
 814                         ret = dvb_net_ule_new_payload(&h);
 815                         if (ret < 0)
 816                                 return;
 817                         if (ret)
 818                                 continue;
 819                 }
 820
 821                 /* Copy data into our current skb. */
 822                 h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
 823                 skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
 824                 h.priv->ule_sndu_remain -= h.how_much;
 825                 h.ts_remain -= h.how_much;
 826                 h.from_where += h.how_much;
 827
 828                 /* Check for complete payload. */
 829                 if (h.priv->ule_sndu_remain <= 0) {
 830                         /* Check CRC32, we've got it in our skb already. */
 831                         __be16 ulen = htons(h.priv->ule_sndu_len);
 832                         __be16 utype = htons(h.priv->ule_sndu_type);
 833                         const u8 *tail;
 834                         struct kvec iov[3] = {
 835                                 { &ulen, sizeof ulen },
 836                                 { &utype, sizeof utype },
 837                                 { h.priv->ule_skb->data,
 838                                   h.priv->ule_skb->len - 4 }
 839                         };
 840                         u32 ule_crc = ~0L, expected_crc;
 841                         if (h.priv->ule_dbit) {
 842                                 /* Set D-bit for CRC32 verification,
 843                                  * if it was set originally. */
 844                                 ulen |= htons(0x8000);
 845                         }
 846
 847                         ule_crc = iov_crc32(ule_crc, iov, 3);
 848                         tail = skb_tail_pointer(h.priv->ule_skb);
 849                         expected_crc = *(tail - 4) << 24 |
 850                                        *(tail - 3) << 16 |
 851                                        *(tail - 2) << 8 |
 852                                        *(tail - 1);
 853
 854                         dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
 855
 856                         /* Prepare for next SNDU. */
 857                         reset_ule(h.priv);
 858                 }
 859
 860                 /* More data in current TS (look at the bytes following the CRC32)? */
 861                 if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
 862                         /* Next ULE SNDU starts right there. */
 863                         h.new_ts = 0;
 864                         h.priv->ule_skb = NULL;
 865                         h.priv->ule_sndu_type_1 = 0;
 866                         h.priv->ule_sndu_len = 0;
 867                         // pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
 868                         //      *(h.from_where + 0), *(h.from_where + 1),
 869                         //      *(h.from_where + 2), *(h.from_where + 3));
 870                         // pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
 871                         // hexdump(h.ts, 188);
 872                 } else {
 873                         h.new_ts = 1;
 874                         h.ts += TS_SZ;
 875                         h.priv->ts_count++;
 876                         if (h.priv->ule_skb == NULL) {
 877                                 h.priv->need_pusi = 1;
 878                                 h.priv->ule_sndu_type_1 = 0;
 879                                 h.priv->ule_sndu_len = 0;
 880                         }
 881                 }
 882         }       /* for all available TS cells */
 883 }
 884
 885 static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
 886                                const u8 *buffer2, size_t buffer2_len,
 887                                struct dmx_ts_feed *feed,
 888                                u32 *buffer_flags)
 889 {
 890         struct net_device *dev = feed->priv;
 891
 892         if (buffer2)
 893                 pr_warn("buffer2 not NULL: %p.\n", buffer2);
 894         if (buffer1_len > 32768)
 895                 pr_warn("length > 32k: %zu.\n", buffer1_len);
 896         /* pr_info("TS callback: %u bytes, %u TS cells @ %p.\n",
 897                   buffer1_len, buffer1_len / TS_SZ, buffer1); */
 898         dvb_net_ule(dev, buffer1, buffer1_len);
 899         return 0;
 900 }
 901
 902
 903 static void dvb_net_sec(struct net_device *dev,
 904                         const u8 *pkt, int pkt_len)
 905 {
 906         u8 *eth;
 907         struct sk_buff *skb;
 908         struct net_device_stats *stats = &dev->stats;
 909         int snap = 0;
 910
 911         /* note: pkt_len includes a 32bit checksum */
 912         if (pkt_len < 16) {
 913                 pr_warn("%s: IP/MPE packet length = %d too small.\n",
 914                         dev->name, pkt_len);
 915                 stats->rx_errors++;
 916                 stats->rx_length_errors++;
 917                 return;
 918         }
 919 /* it seems some ISPs manage to screw up here, so we have to
 920  * relax the error checks... */
 921 #if 0
 922         if ((pkt[5] & 0xfd) != 0xc1) {
 923                 /* drop scrambled or broken packets */
 924 #else
 925         if ((pkt[5] & 0x3c) != 0x00) {
 926                 /* drop scrambled */
 927 #endif
 928                 stats->rx_errors++;
 929                 stats->rx_crc_errors++;
 930                 return;
 931         }
 932         if (pkt[5] & 0x02) {
 933                 /* handle LLC/SNAP, see rfc-1042 */
 934                 if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
 935                         stats->rx_dropped++;
 936                         return;
 937                 }
 938                 snap = 8;
 939         }
 940         if (pkt[7]) {
 941                 /* FIXME: assemble datagram from multiple sections */
 942                 stats->rx_errors++;
 943                 stats->rx_frame_errors++;
 944                 return;
 945         }
 946
 947         /* we have 14 byte ethernet header (ip header follows);
 948          * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
 949          */
 950         if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
 951                 //pr_notice("%s: Memory squeeze, dropping packet.\n", dev->name);
 952                 stats->rx_dropped++;
 953                 return;
 954         }
 955         skb_reserve(skb, 2);    /* longword align L3 header */
 956         skb->dev = dev;
 957
 958         /* copy L3 payload */
 959         eth = skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
 960         memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
 961
 962         /* create ethernet header: */
 963         eth[0]=pkt[0x0b];
 964         eth[1]=pkt[0x0a];
 965         eth[2]=pkt[0x09];
 966         eth[3]=pkt[0x08];
 967         eth[4]=pkt[0x04];
 968         eth[5]=pkt[0x03];
 969
 970         eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
 971
 972         if (snap) {
 973                 eth[12] = pkt[18];
 974                 eth[13] = pkt[19];
 975         } else {
 976                 /* protocol numbers are from rfc-1700 or
 977                  * http://www.iana.org/assignments/ethernet-numbers
 978                  */
 979                 if (pkt[12] >> 4 == 6) { /* version field from IP header */
 980                         eth[12] = 0x86; /* IPv6 */
 981                         eth[13] = 0xdd;
 982                 } else {
 983                         eth[12] = 0x08; /* IPv4 */
 984                         eth[13] = 0x00;
 985                 }
 986         }
 987
 988         skb->protocol = dvb_net_eth_type_trans(skb, dev);
 989
 990         stats->rx_packets++;
 991         stats->rx_bytes+=skb->len;
 992         netif_rx(skb);
 993 }
 994
 995 static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
 996                  const u8 *buffer2, size_t buffer2_len,
 997                  struct dmx_section_filter *filter, u32 *buffer_flags)
 998 {
 999         struct net_device *dev = filter->priv;
1000
1001         /*
1002          * we rely on the DVB API definition where exactly one complete
1003          * section is delivered in buffer1
1004          */
1005         dvb_net_sec (dev, buffer1, buffer1_len);
1006         return 0;
1007 }
1008
1009 static netdev_tx_t dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
1010 {
1011         dev_kfree_skb(skb);
1012         return NETDEV_TX_OK;
1013 }
1014
1015 static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1016 static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
1017 static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
1018 static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1019
1020 static int dvb_net_filter_sec_set(struct net_device *dev,
1021                    struct dmx_section_filter **secfilter,
1022                    u8 *mac, u8 *mac_mask)
1023 {
1024         struct dvb_net_priv *priv = netdev_priv(dev);
1025         int ret;
1026
1027         *secfilter=NULL;
1028         ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
1029         if (ret<0) {
1030                 pr_err("%s: could not get filter\n", dev->name);
1031                 return ret;
1032         }
1033
1034         (*secfilter)->priv=(void *) dev;
1035
1036         memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
1037         memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
1038         memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
1039
1040         (*secfilter)->filter_value[0]=0x3e;
1041         (*secfilter)->filter_value[3]=mac[5];
1042         (*secfilter)->filter_value[4]=mac[4];
1043         (*secfilter)->filter_value[8]=mac[3];
1044         (*secfilter)->filter_value[9]=mac[2];
1045         (*secfilter)->filter_value[10]=mac[1];
1046         (*secfilter)->filter_value[11]=mac[0];
1047
1048         (*secfilter)->filter_mask[0] = 0xff;
1049         (*secfilter)->filter_mask[3] = mac_mask[5];
1050         (*secfilter)->filter_mask[4] = mac_mask[4];
1051         (*secfilter)->filter_mask[8] = mac_mask[3];
1052         (*secfilter)->filter_mask[9] = mac_mask[2];
1053         (*secfilter)->filter_mask[10] = mac_mask[1];
1054         (*secfilter)->filter_mask[11]=mac_mask[0];
1055
1056         netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
1057
1058         return 0;
1059 }
1060
1061 static int dvb_net_feed_start(struct net_device *dev)
1062 {
1063         int ret = 0, i;
1064         struct dvb_net_priv *priv = netdev_priv(dev);
1065         struct dmx_demux *demux = priv->demux;
1066         unsigned char *mac = (unsigned char *) dev->dev_addr;
1067
1068         netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
1069         mutex_lock(&priv->mutex);
1070         if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
1071                 pr_err("%s: BUG %d\n", __func__, __LINE__);
1072
1073         priv->secfeed=NULL;
1074         priv->secfilter=NULL;
1075         priv->tsfeed = NULL;
1076
1077         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1078                 netdev_dbg(dev, "alloc secfeed\n");
1079                 ret=demux->allocate_section_feed(demux, &priv->secfeed,
1080                                          dvb_net_sec_callback);
1081                 if (ret<0) {
1082                         pr_err("%s: could not allocate section feed\n",
1083                                dev->name);
1084                         goto error;
1085                 }
1086
1087                 ret = priv->secfeed->set(priv->secfeed, priv->pid, 1);
1088
1089                 if (ret<0) {
1090                         pr_err("%s: could not set section feed\n", dev->name);
1091                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1092                         priv->secfeed=NULL;
1093                         goto error;
1094                 }
1095
1096                 if (priv->rx_mode != RX_MODE_PROMISC) {
1097                         netdev_dbg(dev, "set secfilter\n");
1098                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
1099                 }
1100
1101                 switch (priv->rx_mode) {
1102                 case RX_MODE_MULTI:
1103                         for (i = 0; i < priv->multi_num; i++) {
1104                                 netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
1105                                 dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
1106                                                        priv->multi_macs[i], mask_normal);
1107                         }
1108                         break;
1109                 case RX_MODE_ALL_MULTI:
1110                         priv->multi_num=1;
1111                         netdev_dbg(dev, "set multi_secfilter[0]\n");
1112                         dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
1113                                                mac_allmulti, mask_allmulti);
1114                         break;
1115                 case RX_MODE_PROMISC:
1116                         priv->multi_num=0;
1117                         netdev_dbg(dev, "set secfilter\n");
1118                         dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
1119                         break;
1120                 }
1121
1122                 netdev_dbg(dev, "start filtering\n");
1123                 priv->secfeed->start_filtering(priv->secfeed);
1124         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1125                 ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
1126
1127                 /* we have payloads encapsulated in TS */
1128                 netdev_dbg(dev, "alloc tsfeed\n");
1129                 ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1130                 if (ret < 0) {
1131                         pr_err("%s: could not allocate ts feed\n", dev->name);
1132                         goto error;
1133                 }
1134
1135                 /* Set netdevice pointer for ts decaps callback. */
1136                 priv->tsfeed->priv = (void *)dev;
1137                 ret = priv->tsfeed->set(priv->tsfeed,
1138                                         priv->pid, /* pid */
1139                                         TS_PACKET, /* type */
1140                                         DMX_PES_OTHER, /* pes type */
1141                                         timeout    /* timeout */
1142                                         );
1143
1144                 if (ret < 0) {
1145                         pr_err("%s: could not set ts feed\n", dev->name);
1146                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1147                         priv->tsfeed = NULL;
1148                         goto error;
1149                 }
1150
1151                 netdev_dbg(dev, "start filtering\n");
1152                 priv->tsfeed->start_filtering(priv->tsfeed);
1153         } else
1154                 ret = -EINVAL;
1155
1156 error:
1157         mutex_unlock(&priv->mutex);
1158         return ret;
1159 }
1160
1161 static int dvb_net_feed_stop(struct net_device *dev)
1162 {
1163         struct dvb_net_priv *priv = netdev_priv(dev);
1164         int i, ret = 0;
1165
1166         mutex_lock(&priv->mutex);
1167         if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1168                 if (priv->secfeed) {
1169                         if (priv->secfeed->is_filtering) {
1170                                 netdev_dbg(dev, "stop secfeed\n");
1171                                 priv->secfeed->stop_filtering(priv->secfeed);
1172                         }
1173
1174                         if (priv->secfilter) {
1175                                 netdev_dbg(dev, "release secfilter\n");
1176                                 priv->secfeed->release_filter(priv->secfeed,
1177                                                               priv->secfilter);
1178                                 priv->secfilter=NULL;
1179                         }
1180
1181                         for (i=0; i<priv->multi_num; i++) {
1182                                 if (priv->multi_secfilter[i]) {
1183                                         netdev_dbg(dev, "release multi_filter[%d]\n",
1184                                                    i);
1185                                         priv->secfeed->release_filter(priv->secfeed,
1186                                                                       priv->multi_secfilter[i]);
1187                                         priv->multi_secfilter[i] = NULL;
1188                                 }
1189                         }
1190
1191                         priv->demux->release_section_feed(priv->demux, priv->secfeed);
1192                         priv->secfeed = NULL;
1193                 } else
1194                         pr_err("%s: no feed to stop\n", dev->name);
1195         } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1196                 if (priv->tsfeed) {
1197                         if (priv->tsfeed->is_filtering) {
1198                                 netdev_dbg(dev, "stop tsfeed\n");
1199                                 priv->tsfeed->stop_filtering(priv->tsfeed);
1200                         }
1201                         priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1202                         priv->tsfeed = NULL;
1203                 }
1204                 else
1205                         pr_err("%s: no ts feed to stop\n", dev->name);
1206         } else
1207                 ret = -EINVAL;
1208         mutex_unlock(&priv->mutex);
1209         return ret;
1210 }
1211
1212
1213 static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1214 {
1215         struct dvb_net_priv *priv = netdev_priv(dev);
1216
1217         if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1218                 return -ENOMEM;
1219
1220         memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1221
1222         priv->multi_num++;
1223         return 0;
1224 }
1225
1226
1227 static void wq_set_multicast_list (struct work_struct *work)
1228 {
1229         struct dvb_net_priv *priv =
1230                 container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1231         struct net_device *dev = priv->net;
1232
1233         dvb_net_feed_stop(dev);
1234         priv->rx_mode = RX_MODE_UNI;
1235         netif_addr_lock_bh(dev);
1236
1237         if (dev->flags & IFF_PROMISC) {
1238                 netdev_dbg(dev, "promiscuous mode\n");
1239                 priv->rx_mode = RX_MODE_PROMISC;
1240         } else if ((dev->flags & IFF_ALLMULTI)) {
1241                 netdev_dbg(dev, "allmulti mode\n");
1242                 priv->rx_mode = RX_MODE_ALL_MULTI;
1243         } else if (!netdev_mc_empty(dev)) {
1244                 struct netdev_hw_addr *ha;
1245
1246                 netdev_dbg(dev, "set_mc_list, %d entries\n",
1247                            netdev_mc_count(dev));
1248
1249                 priv->rx_mode = RX_MODE_MULTI;
1250                 priv->multi_num = 0;
1251
1252                 netdev_for_each_mc_addr(ha, dev)
1253                         dvb_set_mc_filter(dev, ha->addr);
1254         }
1255
1256         netif_addr_unlock_bh(dev);
1257         dvb_net_feed_start(dev);
1258 }
1259
1260
1261 static void dvb_net_set_multicast_list (struct net_device *dev)
1262 {
1263         struct dvb_net_priv *priv = netdev_priv(dev);
1264         schedule_work(&priv->set_multicast_list_wq);
1265 }
1266
1267
1268 static void wq_restart_net_feed (struct work_struct *work)
1269 {
1270         struct dvb_net_priv *priv =
1271                 container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1272         struct net_device *dev = priv->net;
1273
1274         if (netif_running(dev)) {
1275                 dvb_net_feed_stop(dev);
1276                 dvb_net_feed_start(dev);
1277         }
1278 }
1279
1280
1281 static int dvb_net_set_mac (struct net_device *dev, void *p)
1282 {
1283         struct dvb_net_priv *priv = netdev_priv(dev);
1284         struct sockaddr *addr=p;
1285
1286         memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1287
1288         if (netif_running(dev))
1289                 schedule_work(&priv->restart_net_feed_wq);
1290
1291         return 0;
1292 }
1293
1294
1295 static int dvb_net_open(struct net_device *dev)
1296 {
1297         struct dvb_net_priv *priv = netdev_priv(dev);
1298
1299         priv->in_use++;
1300         dvb_net_feed_start(dev);
1301         return 0;
1302 }
1303
1304
1305 static int dvb_net_stop(struct net_device *dev)
1306 {
1307         struct dvb_net_priv *priv = netdev_priv(dev);
1308
1309         priv->in_use--;
1310         return dvb_net_feed_stop(dev);
1311 }
1312
1313 static const struct header_ops dvb_header_ops = {
1314         .create         = eth_header,
1315         .parse          = eth_header_parse,
1316 };
1317
1318
1319 static const struct net_device_ops dvb_netdev_ops = {
1320         .ndo_open               = dvb_net_open,
1321         .ndo_stop               = dvb_net_stop,
1322         .ndo_start_xmit         = dvb_net_tx,
1323         .ndo_set_rx_mode        = dvb_net_set_multicast_list,
1324         .ndo_set_mac_address    = dvb_net_set_mac,
1325         .ndo_validate_addr      = eth_validate_addr,
1326 };
1327
1328 static void dvb_net_setup(struct net_device *dev)
1329 {
1330         ether_setup(dev);
1331
1332         dev->header_ops         = &dvb_header_ops;
1333         dev->netdev_ops         = &dvb_netdev_ops;
1334         dev->mtu                = 4096;
1335         dev->max_mtu            = 4096;
1336
1337         dev->flags |= IFF_NOARP;
1338 }
1339
1340 static int get_if(struct dvb_net *dvbnet)
1341 {
1342         int i;
1343
1344         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1345                 if (!dvbnet->state[i])
1346                         break;
1347
1348         if (i == DVB_NET_DEVICES_MAX)
1349                 return -1;
1350
1351         dvbnet->state[i]=1;
1352         return i;
1353 }
1354
1355 static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1356 {
1357         struct net_device *net;
1358         struct dvb_net_priv *priv;
1359         int result;
1360         int if_num;
1361
1362         if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1363                 return -EINVAL;
1364         if ((if_num = get_if(dvbnet)) < 0)
1365                 return -EINVAL;
1366
1367         net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1368                            NET_NAME_UNKNOWN, dvb_net_setup);
1369         if (!net)
1370                 return -ENOMEM;
1371
1372         if (dvbnet->dvbdev->id)
1373                 snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1374                          dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1375         else
1376                 /* compatibility fix to keep dvb0_0 format */
1377                 snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1378                          dvbnet->dvbdev->adapter->num, if_num);
1379
1380         net->addr_len = 6;
1381         memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
1382
1383         dvbnet->device[if_num] = net;
1384
1385         priv = netdev_priv(net);
1386         priv->net = net;
1387         priv->demux = dvbnet->demux;
1388         priv->pid = pid;
1389         priv->rx_mode = RX_MODE_UNI;
1390         priv->need_pusi = 1;
1391         priv->tscc = 0;
1392         priv->feedtype = feedtype;
1393         reset_ule(priv);
1394
1395         INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1396         INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1397         mutex_init(&priv->mutex);
1398
1399         net->base_addr = pid;
1400
1401         if ((result = register_netdev(net)) < 0) {
1402                 dvbnet->device[if_num] = NULL;
1403                 free_netdev(net);
1404                 return result;
1405         }
1406         pr_info("created network interface %s\n", net->name);
1407
1408         return if_num;
1409 }
1410
1411 static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1412 {
1413         struct net_device *net = dvbnet->device[num];
1414         struct dvb_net_priv *priv;
1415
1416         if (!dvbnet->state[num])
1417                 return -EINVAL;
1418         priv = netdev_priv(net);
1419         if (priv->in_use)
1420                 return -EBUSY;
1421
1422         dvb_net_stop(net);
1423         flush_work(&priv->set_multicast_list_wq);
1424         flush_work(&priv->restart_net_feed_wq);
1425         pr_info("removed network interface %s\n", net->name);
1426         unregister_netdev(net);
1427         dvbnet->state[num]=0;
1428         dvbnet->device[num] = NULL;
1429         free_netdev(net);
1430
1431         return 0;
1432 }
1433
1434 static int dvb_net_do_ioctl(struct file *file,
1435                   unsigned int cmd, void *parg)
1436 {
1437         struct dvb_device *dvbdev = file->private_data;
1438         struct dvb_net *dvbnet = dvbdev->priv;
1439         int ret = 0;
1440
1441         if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1442                 return -EPERM;
1443
1444         if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1445                 return -ERESTARTSYS;
1446
1447         switch (cmd) {
1448         case NET_ADD_IF:
1449         {
1450                 struct dvb_net_if *dvbnetif = parg;
1451                 int result;
1452
1453                 if (!capable(CAP_SYS_ADMIN)) {
1454                         ret = -EPERM;
1455                         goto ioctl_error;
1456                 }
1457
1458                 if (!try_module_get(dvbdev->adapter->module)) {
1459                         ret = -EPERM;
1460                         goto ioctl_error;
1461                 }
1462
1463                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1464                 if (result<0) {
1465                         module_put(dvbdev->adapter->module);
1466                         ret = result;
1467                         goto ioctl_error;
1468                 }
1469                 dvbnetif->if_num=result;
1470                 break;
1471         }
1472         case NET_GET_IF:
1473         {
1474                 struct net_device *netdev;
1475                 struct dvb_net_priv *priv_data;
1476                 struct dvb_net_if *dvbnetif = parg;
1477                 int if_num = dvbnetif->if_num;
1478
1479                 if (if_num >= DVB_NET_DEVICES_MAX) {
1480                         ret = -EINVAL;
1481                         goto ioctl_error;
1482                 }
1483                 if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1484
1485                 if (!dvbnet->state[if_num]) {
1486                         ret = -EINVAL;
1487                         goto ioctl_error;
1488                 }
1489
1490                 netdev = dvbnet->device[if_num];
1491
1492                 priv_data = netdev_priv(netdev);
1493                 dvbnetif->pid=priv_data->pid;
1494                 dvbnetif->feedtype=priv_data->feedtype;
1495                 break;
1496         }
1497         case NET_REMOVE_IF:
1498         {
1499                 if (!capable(CAP_SYS_ADMIN)) {
1500                         ret = -EPERM;
1501                         goto ioctl_error;
1502                 }
1503                 if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1504                         ret = -EINVAL;
1505                         goto ioctl_error;
1506                 }
1507                 ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1508                 if (!ret)
1509                         module_put(dvbdev->adapter->module);
1510                 break;
1511         }
1512
1513         /* binary compatibility cruft */
1514         case __NET_ADD_IF_OLD:
1515         {
1516                 struct __dvb_net_if_old *dvbnetif = parg;
1517                 int result;
1518
1519                 if (!capable(CAP_SYS_ADMIN)) {
1520                         ret = -EPERM;
1521                         goto ioctl_error;
1522                 }
1523
1524                 if (!try_module_get(dvbdev->adapter->module)) {
1525                         ret = -EPERM;
1526                         goto ioctl_error;
1527                 }
1528
1529                 result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1530                 if (result<0) {
1531                         module_put(dvbdev->adapter->module);
1532                         ret = result;
1533                         goto ioctl_error;
1534                 }
1535                 dvbnetif->if_num=result;
1536                 break;
1537         }
1538         case __NET_GET_IF_OLD:
1539         {
1540                 struct net_device *netdev;
1541                 struct dvb_net_priv *priv_data;
1542                 struct __dvb_net_if_old *dvbnetif = parg;
1543                 int if_num = dvbnetif->if_num;
1544
1545                 if (if_num >= DVB_NET_DEVICES_MAX) {
1546                         ret = -EINVAL;
1547                         goto ioctl_error;
1548                 }
1549                 if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1550
1551                 if (!dvbnet->state[if_num]) {
1552                         ret = -EINVAL;
1553                         goto ioctl_error;
1554                 }
1555
1556                 netdev = dvbnet->device[if_num];
1557
1558                 priv_data = netdev_priv(netdev);
1559                 dvbnetif->pid=priv_data->pid;
1560                 break;
1561         }
1562         default:
1563                 ret = -ENOTTY;
1564                 break;
1565         }
1566
1567 ioctl_error:
1568         mutex_unlock(&dvbnet->ioctl_mutex);
1569         return ret;
1570 }
1571
1572 static long dvb_net_ioctl(struct file *file,
1573               unsigned int cmd, unsigned long arg)
1574 {
1575         return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1576 }
1577
1578 static int locked_dvb_net_open(struct inode *inode, struct file *file)
1579 {
1580         struct dvb_device *dvbdev = file->private_data;
1581         struct dvb_net *dvbnet = dvbdev->priv;
1582         int ret;
1583
1584         if (mutex_lock_interruptible(&dvbnet->remove_mutex))
1585                 return -ERESTARTSYS;
1586
1587         if (dvbnet->exit) {
1588                 mutex_unlock(&dvbnet->remove_mutex);
1589                 return -ENODEV;
1590         }
1591
1592         ret = dvb_generic_open(inode, file);
1593
1594         mutex_unlock(&dvbnet->remove_mutex);
1595
1596         return ret;
1597 }
1598
1599 static int dvb_net_close(struct inode *inode, struct file *file)
1600 {
1601         struct dvb_device *dvbdev = file->private_data;
1602         struct dvb_net *dvbnet = dvbdev->priv;
1603
1604         mutex_lock(&dvbnet->remove_mutex);
1605
1606         dvb_generic_release(inode, file);
1607
1608         if (dvbdev->users == 1 && dvbnet->exit == 1) {
1609                 mutex_unlock(&dvbnet->remove_mutex);
1610                 wake_up(&dvbdev->wait_queue);
1611         } else {
1612                 mutex_unlock(&dvbnet->remove_mutex);
1613         }
1614
1615         return 0;
1616 }
1617
1618
1619 static const struct file_operations dvb_net_fops = {
1620         .owner = THIS_MODULE,
1621         .unlocked_ioctl = dvb_net_ioctl,
1622         .open = locked_dvb_net_open,
1623         .release = dvb_net_close,
1624         .llseek = noop_llseek,
1625 };
1626
1627 static const struct dvb_device dvbdev_net = {
1628         .priv = NULL,
1629         .users = 1,
1630         .writers = 1,
1631 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1632         .name = "dvb-net",
1633 #endif
1634         .fops = &dvb_net_fops,
1635 };
1636
1637 void dvb_net_release (struct dvb_net *dvbnet)
1638 {
1639         int i;
1640
1641         mutex_lock(&dvbnet->remove_mutex);
1642         dvbnet->exit = 1;
1643         mutex_unlock(&dvbnet->remove_mutex);
1644
1645         if (dvbnet->dvbdev->users < 1)
1646                 wait_event(dvbnet->dvbdev->wait_queue,
1647                                 dvbnet->dvbdev->users == 1);
1648
1649         dvb_unregister_device(dvbnet->dvbdev);
1650
1651         for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1652                 if (!dvbnet->state[i])
1653                         continue;
1654                 dvb_net_remove_if(dvbnet, i);
1655         }
1656 }
1657 EXPORT_SYMBOL(dvb_net_release);
1658
1659
1660 int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1661                   struct dmx_demux *dmx)
1662 {
1663         int i;
1664
1665         mutex_init(&dvbnet->ioctl_mutex);
1666         mutex_init(&dvbnet->remove_mutex);
1667         dvbnet->demux = dmx;
1668
1669         for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1670                 dvbnet->state[i] = 0;
1671
1672         return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1673                              dvbnet, DVB_DEVICE_NET, 0);
1674 }
1675 EXPORT_SYMBOL(dvb_net_init);