linux/drivers/media/dvb-core/dvb_net.c
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   1/*
   2 * dvb_net.c
   3 *
   4 * Copyright (C) 2001 Convergence integrated media GmbH
   5 *                    Ralph Metzler <ralph@convergence.de>
   6 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
   7 *
   8 * ULE Decapsulation code:
   9 * Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
  10 *                      and Department of Scientific Computing
  11 *                          Paris Lodron University of Salzburg.
  12 *                          Hilmar Linder <hlinder@cosy.sbg.ac.at>
  13 *                      and Wolfram Stering <wstering@cosy.sbg.ac.at>
  14 *
  15 * ULE Decaps according to RFC 4326.
  16 *
  17 * This program is free software; you can redistribute it and/or
  18 * modify it under the terms of the GNU General Public License
  19 * as published by the Free Software Foundation; either version 2
  20 * of the License, or (at your option) any later version.
  21 *
  22 * This program is distributed in the hope that it will be useful,
  23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 * GNU General Public License for more details.
  26 *
  27 * You should have received a copy of the GNU General Public License
  28 * along with this program; if not, write to the Free Software
  29 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  30 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  31 */
  32
  33/*
  34 * ULE ChangeLog:
  35 * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
  36 *
  37 * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
  38 *                       ULE Extension header handling.
  39 *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
  40 *                       Fraunhofer Institute for Open Communication Systems
  41 *                       Competence Center for Advanced Satellite Communications.
  42 *                     Bugfixes and robustness improvements.
  43 *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
  44 *                     ULE_DEBUG compile-time option.
  45 * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
  46 *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
  47 *                       Paris Lodron University of Salzburg.
  48 */
  49
  50/*
  51 * FIXME / TODO (dvb_net.c):
  52 *
  53 * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
  54 *
  55 */
  56
  57#include <linux/module.h>
  58#include <linux/kernel.h>
  59#include <linux/netdevice.h>
  60#include <linux/etherdevice.h>
  61#include <linux/dvb/net.h>
  62#include <linux/uio.h>
  63#include <asm/uaccess.h>
  64#include <linux/crc32.h>
  65#include <linux/mutex.h>
  66#include <linux/sched.h>
  67
  68#include "dvb_demux.h"
  69#include "dvb_net.h"
  70
  71static 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#undef ULE_DEBUG
  83
  84#ifdef ULE_DEBUG
  85
  86static void hexdump(const unsigned char *buf, unsigned short len)
  87{
  88        print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  89}
  90
  91#endif
  92
  93struct dvb_net_priv {
  94        int in_use;
  95        u16 pid;
  96        struct net_device *net;
  97        struct dvb_net *host;
  98        struct dmx_demux *demux;
  99        struct dmx_section_feed *secfeed;
 100        struct dmx_section_filter *secfilter;
 101        struct dmx_ts_feed *tsfeed;
 102        int multi_num;
 103        struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
 104        unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
 105        int rx_mode;
 106#define RX_MODE_UNI 0
 107#define RX_MODE_MULTI 1
 108#define RX_MODE_ALL_MULTI 2
 109#define RX_MODE_PROMISC 3
 110        struct work_struct set_multicast_list_wq;
 111        struct work_struct restart_net_feed_wq;
 112        unsigned char feedtype;                 /* Either FEED_TYPE_ or FEED_TYPE_ULE */
 113        int need_pusi;                          /* Set to 1, if synchronization on PUSI required. */
 114        unsigned char tscc;                     /* TS continuity counter after sync on PUSI. */
 115        struct sk_buff *ule_skb;                /* ULE SNDU decodes into this buffer. */
 116        unsigned char *ule_next_hdr;            /* Pointer into skb to next ULE extension header. */
 117        unsigned short ule_sndu_len;            /* ULE SNDU length in bytes, w/o D-Bit. */
 118        unsigned short ule_sndu_type;           /* ULE SNDU type field, complete. */
 119        unsigned char ule_sndu_type_1;          /* ULE SNDU type field, if split across 2 TS cells. */
 120        unsigned char ule_dbit;                 /* Whether the DestMAC address present
 121                                                 * or not (bit is set). */
 122        unsigned char ule_bridged;              /* Whether the ULE_BRIDGED extension header was found. */
 123        int ule_sndu_remain;                    /* Nr. of bytes still required for current ULE SNDU. */
 124        unsigned long ts_count;                 /* Current ts cell counter. */
 125        struct mutex mutex;
 126};
 127
 128
 129/**
 130 *      Determine the packet's protocol ID. The rule here is that we
 131 *      assume 802.3 if the type field is short enough to be a length.
 132 *      This is normal practice and works for any 'now in use' protocol.
 133 *
 134 *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 135 *  by Michael Holzt <kju@debian.org>
 136 */
 137static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 138                                      struct net_device *dev)
 139{
 140        struct ethhdr *eth;
 141        unsigned char *rawp;
 142
 143        skb_reset_mac_header(skb);
 144        skb_pull(skb,dev->hard_header_len);
 145        eth = eth_hdr(skb);
 146
 147        if (*eth->h_dest & 1) {
 148                if(ether_addr_equal(eth->h_dest,dev->broadcast))
 149                        skb->pkt_type=PACKET_BROADCAST;
 150                else
 151                        skb->pkt_type=PACKET_MULTICAST;
 152        }
 153
 154        if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 155                return eth->h_proto;
 156
 157        rawp = skb->data;
 158
 159        /**
 160         *      This is a magic hack to spot IPX packets. Older Novell breaks
 161         *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
 162         *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 163         *      won't work for fault tolerant netware but does for the rest.
 164         */
 165        if (*(unsigned short *)rawp == 0xFFFF)
 166                return htons(ETH_P_802_3);
 167
 168        /**
 169         *      Real 802.2 LLC
 170         */
 171        return htons(ETH_P_802_2);
 172}
 173
 174#define TS_SZ   188
 175#define TS_SYNC 0x47
 176#define TS_TEI  0x80
 177#define TS_SC   0xC0
 178#define TS_PUSI 0x40
 179#define TS_AF_A 0x20
 180#define TS_AF_D 0x10
 181
 182/* ULE Extension Header handlers. */
 183
 184#define ULE_TEST        0
 185#define ULE_BRIDGED     1
 186
 187#define ULE_OPTEXTHDR_PADDING 0
 188
 189static int ule_test_sndu( struct dvb_net_priv *p )
 190{
 191        return -1;
 192}
 193
 194static int ule_bridged_sndu( struct dvb_net_priv *p )
 195{
 196        struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
 197        if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 198                int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
 199                /* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 200                if(framelen != ntohs(hdr->h_proto)) {
 201                        return -1;
 202                }
 203        }
 204        /* Note:
 205         * From RFC4326:
 206         *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
 207         *   It must be the final (or only) extension header specified in the header chain of a SNDU."
 208         * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
 209         */
 210        p->ule_bridged = 1;
 211        return 0;
 212}
 213
 214static int ule_exthdr_padding(struct dvb_net_priv *p)
 215{
 216        return 0;
 217}
 218
 219/** Handle ULE extension headers.
 220 *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 221 *  Returns: >= 0: nr. of bytes consumed by next extension header
 222 *           -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 223 */
 224static int handle_one_ule_extension( struct dvb_net_priv *p )
 225{
 226        /* Table of mandatory extension header handlers.  The header type is the index. */
 227        static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
 228                { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
 229
 230        /* Table of optional extension header handlers.  The header type is the index. */
 231        static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
 232                { [0] = ule_exthdr_padding, [1] = NULL, };
 233
 234        int ext_len = 0;
 235        unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
 236        unsigned char htype = p->ule_sndu_type & 0x00FF;
 237
 238        /* Discriminate mandatory and optional extension headers. */
 239        if (hlen == 0) {
 240                /* Mandatory extension header */
 241                if (ule_mandatory_ext_handlers[htype]) {
 242                        ext_len = ule_mandatory_ext_handlers[htype]( p );
 243                        if(ext_len >= 0) {
 244                                p->ule_next_hdr += ext_len;
 245                                if (!p->ule_bridged) {
 246                                        p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
 247                                        p->ule_next_hdr += 2;
 248                                } else {
 249                                        p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
 250                                        /* This assures the extension handling loop will terminate. */
 251                                }
 252                        }
 253                        // else: extension handler failed or SNDU should be discarded
 254                } else
 255                        ext_len = -1;   /* SNDU has to be discarded. */
 256        } else {
 257                /* Optional extension header.  Calculate the length. */
 258                ext_len = hlen << 1;
 259                /* Process the optional extension header according to its type. */
 260                if (ule_optional_ext_handlers[htype])
 261                        (void)ule_optional_ext_handlers[htype]( p );
 262                p->ule_next_hdr += ext_len;
 263                p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
 264                /*
 265                 * note: the length of the next header type is included in the
 266                 * length of THIS optional extension header
 267                 */
 268        }
 269
 270        return ext_len;
 271}
 272
 273static int handle_ule_extensions( struct dvb_net_priv *p )
 274{
 275        int total_ext_len = 0, l;
 276
 277        p->ule_next_hdr = p->ule_skb->data;
 278        do {
 279                l = handle_one_ule_extension( p );
 280                if (l < 0)
 281                        return l;       /* Stop extension header processing and discard SNDU. */
 282                total_ext_len += l;
 283#ifdef ULE_DEBUG
 284                pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
 285                         p->ule_next_hdr, (int)p->ule_sndu_type,
 286                         l, total_ext_len);
 287#endif
 288
 289        } while (p->ule_sndu_type < ETH_P_802_3_MIN);
 290
 291        return total_ext_len;
 292}
 293
 294
 295/** Prepare for a new ULE SNDU: reset the decoder state. */
 296static inline void reset_ule( struct dvb_net_priv *p )
 297{
 298        p->ule_skb = NULL;
 299        p->ule_next_hdr = NULL;
 300        p->ule_sndu_len = 0;
 301        p->ule_sndu_type = 0;
 302        p->ule_sndu_type_1 = 0;
 303        p->ule_sndu_remain = 0;
 304        p->ule_dbit = 0xFF;
 305        p->ule_bridged = 0;
 306}
 307
 308/**
 309 * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 310 * TS cells of a single PID.
 311 */
 312static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
 313{
 314        struct dvb_net_priv *priv = netdev_priv(dev);
 315        unsigned long skipped = 0L;
 316        const u8 *ts, *ts_end, *from_where = NULL;
 317        u8 ts_remain = 0, how_much = 0, new_ts = 1;
 318        struct ethhdr *ethh = NULL;
 319        bool error = false;
 320
 321#ifdef ULE_DEBUG
 322        /* The code inside ULE_DEBUG keeps a history of the last 100 TS cells processed. */
 323        static unsigned char ule_hist[100*TS_SZ];
 324        static unsigned char *ule_where = ule_hist, ule_dump;
 325#endif
 326
 327        /* For all TS cells in current buffer.
 328         * Appearently, we are called for every single TS cell.
 329         */
 330        for (ts = buf, ts_end = buf + buf_len; ts < ts_end; /* no default incr. */ ) {
 331
 332                if (new_ts) {
 333                        /* We are about to process a new TS cell. */
 334
 335#ifdef ULE_DEBUG
 336                        if (ule_where >= &ule_hist[100*TS_SZ]) ule_where = ule_hist;
 337                        memcpy( ule_where, ts, TS_SZ );
 338                        if (ule_dump) {
 339                                hexdump( ule_where, TS_SZ );
 340                                ule_dump = 0;
 341                        }
 342                        ule_where += TS_SZ;
 343#endif
 344
 345                        /* Check TS error conditions: sync_byte, transport_error_indicator, scrambling_control . */
 346                        if ((ts[0] != TS_SYNC) || (ts[1] & TS_TEI) || ((ts[3] & TS_SC) != 0)) {
 347                                printk(KERN_WARNING "%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
 348                                       priv->ts_count, ts[0],
 349                                       (ts[1] & TS_TEI) >> 7,
 350                                       (ts[3] & TS_SC) >> 6);
 351
 352                                /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 353                                if (priv->ule_skb) {
 354                                        dev_kfree_skb( priv->ule_skb );
 355                                        /* Prepare for next SNDU. */
 356                                        dev->stats.rx_errors++;
 357                                        dev->stats.rx_frame_errors++;
 358                                }
 359                                reset_ule(priv);
 360                                priv->need_pusi = 1;
 361
 362                                /* Continue with next TS cell. */
 363                                ts += TS_SZ;
 364                                priv->ts_count++;
 365                                continue;
 366                        }
 367
 368                        ts_remain = 184;
 369                        from_where = ts + 4;
 370                }
 371                /* Synchronize on PUSI, if required. */
 372                if (priv->need_pusi) {
 373                        if (ts[1] & TS_PUSI) {
 374                                /* Find beginning of first ULE SNDU in current TS cell. */
 375                                /* Synchronize continuity counter. */
 376                                priv->tscc = ts[3] & 0x0F;
 377                                /* There is a pointer field here. */
 378                                if (ts[4] > ts_remain) {
 379                                        printk(KERN_ERR "%lu: Invalid ULE packet "
 380                                               "(pointer field %d)\n", priv->ts_count, ts[4]);
 381                                        ts += TS_SZ;
 382                                        priv->ts_count++;
 383                                        continue;
 384                                }
 385                                /* Skip to destination of pointer field. */
 386                                from_where = &ts[5] + ts[4];
 387                                ts_remain -= 1 + ts[4];
 388                                skipped = 0;
 389                        } else {
 390                                skipped++;
 391                                ts += TS_SZ;
 392                                priv->ts_count++;
 393                                continue;
 394                        }
 395                }
 396
 397                if (new_ts) {
 398                        /* Check continuity counter. */
 399                        if ((ts[3] & 0x0F) == priv->tscc)
 400                                priv->tscc = (priv->tscc + 1) & 0x0F;
 401                        else {
 402                                /* TS discontinuity handling: */
 403                                printk(KERN_WARNING "%lu: TS discontinuity: got %#x, "
 404                                       "expected %#x.\n", priv->ts_count, ts[3] & 0x0F, priv->tscc);
 405                                /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 406                                if (priv->ule_skb) {
 407                                        dev_kfree_skb( priv->ule_skb );
 408                                        /* Prepare for next SNDU. */
 409                                        // reset_ule(priv);  moved to below.
 410                                        dev->stats.rx_errors++;
 411                                        dev->stats.rx_frame_errors++;
 412                                }
 413                                reset_ule(priv);
 414                                /* skip to next PUSI. */
 415                                priv->need_pusi = 1;
 416                                continue;
 417                        }
 418                        /* If we still have an incomplete payload, but PUSI is
 419                         * set; some TS cells are missing.
 420                         * This is only possible here, if we missed exactly 16 TS
 421                         * cells (continuity counter wrap). */
 422                        if (ts[1] & TS_PUSI) {
 423                                if (! priv->need_pusi) {
 424                                        if (!(*from_where < (ts_remain-1)) || *from_where != priv->ule_sndu_remain) {
 425                                                /* Pointer field is invalid.  Drop this TS cell and any started ULE SNDU. */
 426                                                printk(KERN_WARNING "%lu: Invalid pointer "
 427                                                       "field: %u.\n", priv->ts_count, *from_where);
 428
 429                                                /* Drop partly decoded SNDU, reset state, resync on PUSI. */
 430                                                if (priv->ule_skb) {
 431                                                        error = true;
 432                                                        dev_kfree_skb(priv->ule_skb);
 433                                                }
 434
 435                                                if (error || priv->ule_sndu_remain) {
 436                                                        dev->stats.rx_errors++;
 437                                                        dev->stats.rx_frame_errors++;
 438                                                        error = false;
 439                                                }
 440
 441                                                reset_ule(priv);
 442                                                priv->need_pusi = 1;
 443                                                continue;
 444                                        }
 445                                        /* Skip pointer field (we're processing a
 446                                         * packed payload). */
 447                                        from_where += 1;
 448                                        ts_remain -= 1;
 449                                } else
 450                                        priv->need_pusi = 0;
 451
 452                                if (priv->ule_sndu_remain > 183) {
 453                                        /* Current SNDU lacks more data than there could be available in the
 454                                         * current TS cell. */
 455                                        dev->stats.rx_errors++;
 456                                        dev->stats.rx_length_errors++;
 457                                        printk(KERN_WARNING "%lu: Expected %d more SNDU bytes, but "
 458                                               "got PUSI (pf %d, ts_remain %d).  Flushing incomplete payload.\n",
 459                                               priv->ts_count, priv->ule_sndu_remain, ts[4], ts_remain);
 460                                        dev_kfree_skb(priv->ule_skb);
 461                                        /* Prepare for next SNDU. */
 462                                        reset_ule(priv);
 463                                        /* Resync: go to where pointer field points to: start of next ULE SNDU. */
 464                                        from_where += ts[4];
 465                                        ts_remain -= ts[4];
 466                                }
 467                        }
 468                }
 469
 470                /* Check if new payload needs to be started. */
 471                if (priv->ule_skb == NULL) {
 472                        /* Start a new payload with skb.
 473                         * Find ULE header.  It is only guaranteed that the
 474                         * length field (2 bytes) is contained in the current
 475                         * TS.
 476                         * Check ts_remain has to be >= 2 here. */
 477                        if (ts_remain < 2) {
 478                                printk(KERN_WARNING "Invalid payload packing: only %d "
 479                                       "bytes left in TS.  Resyncing.\n", ts_remain);
 480                                priv->ule_sndu_len = 0;
 481                                priv->need_pusi = 1;
 482                                ts += TS_SZ;
 483                                continue;
 484                        }
 485
 486                        if (! priv->ule_sndu_len) {
 487                                /* Got at least two bytes, thus extrace the SNDU length. */
 488                                priv->ule_sndu_len = from_where[0] << 8 | from_where[1];
 489                                if (priv->ule_sndu_len & 0x8000) {
 490                                        /* D-Bit is set: no dest mac present. */
 491                                        priv->ule_sndu_len &= 0x7FFF;
 492                                        priv->ule_dbit = 1;
 493                                } else
 494                                        priv->ule_dbit = 0;
 495
 496                                if (priv->ule_sndu_len < 5) {
 497                                        printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
 498                                               "Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
 499                                        dev->stats.rx_errors++;
 500                                        dev->stats.rx_length_errors++;
 501                                        priv->ule_sndu_len = 0;
 502                                        priv->need_pusi = 1;
 503                                        new_ts = 1;
 504                                        ts += TS_SZ;
 505                                        priv->ts_count++;
 506                                        continue;
 507                                }
 508                                ts_remain -= 2; /* consume the 2 bytes SNDU length. */
 509                                from_where += 2;
 510                        }
 511
 512                        priv->ule_sndu_remain = priv->ule_sndu_len + 2;
 513                        /*
 514                         * State of current TS:
 515                         *   ts_remain (remaining bytes in the current TS cell)
 516                         *   0  ule_type is not available now, we need the next TS cell
 517                         *   1  the first byte of the ule_type is present
 518                         * >=2  full ULE header present, maybe some payload data as well.
 519                         */
 520                        switch (ts_remain) {
 521                                case 1:
 522                                        priv->ule_sndu_remain--;
 523                                        priv->ule_sndu_type = from_where[0] << 8;
 524                                        priv->ule_sndu_type_1 = 1; /* first byte of ule_type is set. */
 525                                        ts_remain -= 1; from_where += 1;
 526                                        /* Continue w/ next TS. */
 527                                case 0:
 528                                        new_ts = 1;
 529                                        ts += TS_SZ;
 530                                        priv->ts_count++;
 531                                        continue;
 532
 533                                default: /* complete ULE header is present in current TS. */
 534                                        /* Extract ULE type field. */
 535                                        if (priv->ule_sndu_type_1) {
 536                                                priv->ule_sndu_type_1 = 0;
 537                                                priv->ule_sndu_type |= from_where[0];
 538                                                from_where += 1; /* points to payload start. */
 539                                                ts_remain -= 1;
 540                                        } else {
 541                                                /* Complete type is present in new TS. */
 542                                                priv->ule_sndu_type = from_where[0] << 8 | from_where[1];
 543                                                from_where += 2; /* points to payload start. */
 544                                                ts_remain -= 2;
 545                                        }
 546                                        break;
 547                        }
 548
 549                        /* Allocate the skb (decoder target buffer) with the correct size, as follows:
 550                         * prepare for the largest case: bridged SNDU with MAC address (dbit = 0). */
 551                        priv->ule_skb = dev_alloc_skb( priv->ule_sndu_len + ETH_HLEN + ETH_ALEN );
 552                        if (priv->ule_skb == NULL) {
 553                                printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
 554                                       dev->name);
 555                                dev->stats.rx_dropped++;
 556                                return;
 557                        }
 558
 559                        /* This includes the CRC32 _and_ dest mac, if !dbit. */
 560                        priv->ule_sndu_remain = priv->ule_sndu_len;
 561                        priv->ule_skb->dev = dev;
 562                        /* Leave space for Ethernet or bridged SNDU header (eth hdr plus one MAC addr). */
 563                        skb_reserve( priv->ule_skb, ETH_HLEN + ETH_ALEN );
 564                }
 565
 566                /* Copy data into our current skb. */
 567                how_much = min(priv->ule_sndu_remain, (int)ts_remain);
 568                memcpy(skb_put(priv->ule_skb, how_much), from_where, how_much);
 569                priv->ule_sndu_remain -= how_much;
 570                ts_remain -= how_much;
 571                from_where += how_much;
 572
 573                /* Check for complete payload. */
 574                if (priv->ule_sndu_remain <= 0) {
 575                        /* Check CRC32, we've got it in our skb already. */
 576                        __be16 ulen = htons(priv->ule_sndu_len);
 577                        __be16 utype = htons(priv->ule_sndu_type);
 578                        const u8 *tail;
 579                        struct kvec iov[3] = {
 580                                { &ulen, sizeof ulen },
 581                                { &utype, sizeof utype },
 582                                { priv->ule_skb->data, priv->ule_skb->len - 4 }
 583                        };
 584                        u32 ule_crc = ~0L, expected_crc;
 585                        if (priv->ule_dbit) {
 586                                /* Set D-bit for CRC32 verification,
 587                                 * if it was set originally. */
 588                                ulen |= htons(0x8000);
 589                        }
 590
 591                        ule_crc = iov_crc32(ule_crc, iov, 3);
 592                        tail = skb_tail_pointer(priv->ule_skb);
 593                        expected_crc = *(tail - 4) << 24 |
 594                                       *(tail - 3) << 16 |
 595                                       *(tail - 2) << 8 |
 596                                       *(tail - 1);
 597                        if (ule_crc != expected_crc) {
 598                                printk(KERN_WARNING "%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
 599                                       priv->ts_count, ule_crc, expected_crc, priv->ule_sndu_len, priv->ule_sndu_type, ts_remain, ts_remain > 2 ? *(unsigned short *)from_where : 0);
 600
 601#ifdef ULE_DEBUG
 602                                hexdump( iov[0].iov_base, iov[0].iov_len );
 603                                hexdump( iov[1].iov_base, iov[1].iov_len );
 604                                hexdump( iov[2].iov_base, iov[2].iov_len );
 605
 606                                if (ule_where == ule_hist) {
 607                                        hexdump( &ule_hist[98*TS_SZ], TS_SZ );
 608                                        hexdump( &ule_hist[99*TS_SZ], TS_SZ );
 609                                } else if (ule_where == &ule_hist[TS_SZ]) {
 610                                        hexdump( &ule_hist[99*TS_SZ], TS_SZ );
 611                                        hexdump( ule_hist, TS_SZ );
 612                                } else {
 613                                        hexdump( ule_where - TS_SZ - TS_SZ, TS_SZ );
 614                                        hexdump( ule_where - TS_SZ, TS_SZ );
 615                                }
 616                                ule_dump = 1;
 617#endif
 618
 619                                dev->stats.rx_errors++;
 620                                dev->stats.rx_crc_errors++;
 621                                dev_kfree_skb(priv->ule_skb);
 622                        } else {
 623                                /* CRC32 verified OK. */
 624                                u8 dest_addr[ETH_ALEN];
 625                                static const u8 bc_addr[ETH_ALEN] =
 626                                        { [ 0 ... ETH_ALEN-1] = 0xff };
 627
 628                                /* CRC32 was OK. Remove it from skb. */
 629                                priv->ule_skb->tail -= 4;
 630                                priv->ule_skb->len -= 4;
 631
 632                                if (!priv->ule_dbit) {
 633                                        /*
 634                                         * The destination MAC address is the
 635                                         * next data in the skb.  It comes
 636                                         * before any extension headers.
 637                                         *
 638                                         * Check if the payload of this SNDU
 639                                         * should be passed up the stack.
 640                                         */
 641                                        register int drop = 0;
 642                                        if (priv->rx_mode != RX_MODE_PROMISC) {
 643                                                if (priv->ule_skb->data[0] & 0x01) {
 644                                                        /* multicast or broadcast */
 645                                                        if (!ether_addr_equal(priv->ule_skb->data, bc_addr)) {
 646                                                                /* multicast */
 647                                                                if (priv->rx_mode == RX_MODE_MULTI) {
 648                                                                        int i;
 649                                                                        for(i = 0; i < priv->multi_num &&
 650                                                                            !ether_addr_equal(priv->ule_skb->data,
 651                                                                                              priv->multi_macs[i]); i++)
 652                                                                                ;
 653                                                                        if (i == priv->multi_num)
 654                                                                                drop = 1;
 655                                                                } else if (priv->rx_mode != RX_MODE_ALL_MULTI)
 656                                                                        drop = 1; /* no broadcast; */
 657                                                                /* else: all multicast mode: accept all multicast packets */
 658                                                        }
 659                                                        /* else: broadcast */
 660                                                }
 661                                                else if (!ether_addr_equal(priv->ule_skb->data, dev->dev_addr))
 662                                                        drop = 1;
 663                                                /* else: destination address matches the MAC address of our receiver device */
 664                                        }
 665                                        /* else: promiscuous mode; pass everything up the stack */
 666
 667                                        if (drop) {
 668#ifdef ULE_DEBUG
 669                                                netdev_dbg(dev, "Dropping SNDU: MAC destination address does not match: dest addr: %pM, dev addr: %pM\n",
 670                                                           priv->ule_skb->data, dev->dev_addr);
 671#endif
 672                                                dev_kfree_skb(priv->ule_skb);
 673                                                goto sndu_done;
 674                                        }
 675                                        else
 676                                        {
 677                                                skb_copy_from_linear_data(priv->ule_skb,
 678                                                              dest_addr,
 679                                                              ETH_ALEN);
 680                                                skb_pull(priv->ule_skb, ETH_ALEN);
 681                                        }
 682                                }
 683
 684                                /* Handle ULE Extension Headers. */
 685                                if (priv->ule_sndu_type < ETH_P_802_3_MIN) {
 686                                        /* There is an extension header.  Handle it accordingly. */
 687                                        int l = handle_ule_extensions(priv);
 688                                        if (l < 0) {
 689                                                /* Mandatory extension header unknown or TEST SNDU.  Drop it. */
 690                                                // printk( KERN_WARNING "Dropping SNDU, extension headers.\n" );
 691                                                dev_kfree_skb(priv->ule_skb);
 692                                                goto sndu_done;
 693                                        }
 694                                        skb_pull(priv->ule_skb, l);
 695                                }
 696
 697                                /*
 698                                 * Construct/assure correct ethernet header.
 699                                 * Note: in bridged mode (priv->ule_bridged !=
 700                                 * 0) we already have the (original) ethernet
 701                                 * header at the start of the payload (after
 702                                 * optional dest. address and any extension
 703                                 * headers).
 704                                 */
 705
 706                                if (!priv->ule_bridged) {
 707                                        skb_push(priv->ule_skb, ETH_HLEN);
 708                                        ethh = (struct ethhdr *)priv->ule_skb->data;
 709                                        if (!priv->ule_dbit) {
 710                                                 /* dest_addr buffer is only valid if priv->ule_dbit == 0 */
 711                                                memcpy(ethh->h_dest, dest_addr, ETH_ALEN);
 712                                                eth_zero_addr(ethh->h_source);
 713                                        }
 714                                        else /* zeroize source and dest */
 715                                                memset( ethh, 0, ETH_ALEN*2 );
 716
 717                                        ethh->h_proto = htons(priv->ule_sndu_type);
 718                                }
 719                                /* else:  skb is in correct state; nothing to do. */
 720                                priv->ule_bridged = 0;
 721
 722                                /* Stuff into kernel's protocol stack. */
 723                                priv->ule_skb->protocol = dvb_net_eth_type_trans(priv->ule_skb, dev);
 724                                /* If D-bit is set (i.e. destination MAC address not present),
 725                                 * receive the packet anyhow. */
 726                                /* if (priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
 727                                        priv->ule_skb->pkt_type = PACKET_HOST; */
 728                                dev->stats.rx_packets++;
 729                                dev->stats.rx_bytes += priv->ule_skb->len;
 730                                netif_rx(priv->ule_skb);
 731                        }
 732                        sndu_done:
 733                        /* Prepare for next SNDU. */
 734                        reset_ule(priv);
 735                }
 736
 737                /* More data in current TS (look at the bytes following the CRC32)? */
 738                if (ts_remain >= 2 && *((unsigned short *)from_where) != 0xFFFF) {
 739                        /* Next ULE SNDU starts right there. */
 740                        new_ts = 0;
 741                        priv->ule_skb = NULL;
 742                        priv->ule_sndu_type_1 = 0;
 743                        priv->ule_sndu_len = 0;
 744                        // printk(KERN_WARNING "More data in current TS: [%#x %#x %#x %#x]\n",
 745                        //      *(from_where + 0), *(from_where + 1),
 746                        //      *(from_where + 2), *(from_where + 3));
 747                        // printk(KERN_WARNING "ts @ %p, stopped @ %p:\n", ts, from_where + 0);
 748                        // hexdump(ts, 188);
 749                } else {
 750                        new_ts = 1;
 751                        ts += TS_SZ;
 752                        priv->ts_count++;
 753                        if (priv->ule_skb == NULL) {
 754                                priv->need_pusi = 1;
 755                                priv->ule_sndu_type_1 = 0;
 756                                priv->ule_sndu_len = 0;
 757                        }
 758                }
 759        }       /* for all available TS cells */
 760}
 761
 762static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
 763                               const u8 *buffer2, size_t buffer2_len,
 764                               struct dmx_ts_feed *feed)
 765{
 766        struct net_device *dev = feed->priv;
 767
 768        if (buffer2)
 769                printk(KERN_WARNING "buffer2 not NULL: %p.\n", buffer2);
 770        if (buffer1_len > 32768)
 771                printk(KERN_WARNING "length > 32k: %zu.\n", buffer1_len);
 772        /* printk("TS callback: %u bytes, %u TS cells @ %p.\n",
 773                  buffer1_len, buffer1_len / TS_SZ, buffer1); */
 774        dvb_net_ule(dev, buffer1, buffer1_len);
 775        return 0;
 776}
 777
 778
 779static void dvb_net_sec(struct net_device *dev,
 780                        const u8 *pkt, int pkt_len)
 781{
 782        u8 *eth;
 783        struct sk_buff *skb;
 784        struct net_device_stats *stats = &dev->stats;
 785        int snap = 0;
 786
 787        /* note: pkt_len includes a 32bit checksum */
 788        if (pkt_len < 16) {
 789                printk("%s: IP/MPE packet length = %d too small.\n",
 790                        dev->name, pkt_len);
 791                stats->rx_errors++;
 792                stats->rx_length_errors++;
 793                return;
 794        }
 795/* it seems some ISPs manage to screw up here, so we have to
 796 * relax the error checks... */
 797#if 0
 798        if ((pkt[5] & 0xfd) != 0xc1) {
 799                /* drop scrambled or broken packets */
 800#else
 801        if ((pkt[5] & 0x3c) != 0x00) {
 802                /* drop scrambled */
 803#endif
 804                stats->rx_errors++;
 805                stats->rx_crc_errors++;
 806                return;
 807        }
 808        if (pkt[5] & 0x02) {
 809                /* handle LLC/SNAP, see rfc-1042 */
 810                if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
 811                        stats->rx_dropped++;
 812                        return;
 813                }
 814                snap = 8;
 815        }
 816        if (pkt[7]) {
 817                /* FIXME: assemble datagram from multiple sections */
 818                stats->rx_errors++;
 819                stats->rx_frame_errors++;
 820                return;
 821        }
 822
 823        /* we have 14 byte ethernet header (ip header follows);
 824         * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
 825         */
 826        if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
 827                //printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
 828                stats->rx_dropped++;
 829                return;
 830        }
 831        skb_reserve(skb, 2);    /* longword align L3 header */
 832        skb->dev = dev;
 833
 834        /* copy L3 payload */
 835        eth = (u8 *) skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
 836        memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
 837
 838        /* create ethernet header: */
 839        eth[0]=pkt[0x0b];
 840        eth[1]=pkt[0x0a];
 841        eth[2]=pkt[0x09];
 842        eth[3]=pkt[0x08];
 843        eth[4]=pkt[0x04];
 844        eth[5]=pkt[0x03];
 845
 846        eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
 847
 848        if (snap) {
 849                eth[12] = pkt[18];
 850                eth[13] = pkt[19];
 851        } else {
 852                /* protocol numbers are from rfc-1700 or
 853                 * http://www.iana.org/assignments/ethernet-numbers
 854                 */
 855                if (pkt[12] >> 4 == 6) { /* version field from IP header */
 856                        eth[12] = 0x86; /* IPv6 */
 857                        eth[13] = 0xdd;
 858                } else {
 859                        eth[12] = 0x08; /* IPv4 */
 860                        eth[13] = 0x00;
 861                }
 862        }
 863
 864        skb->protocol = dvb_net_eth_type_trans(skb, dev);
 865
 866        stats->rx_packets++;
 867        stats->rx_bytes+=skb->len;
 868        netif_rx(skb);
 869}
 870
 871static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
 872                 const u8 *buffer2, size_t buffer2_len,
 873                 struct dmx_section_filter *filter)
 874{
 875        struct net_device *dev = filter->priv;
 876
 877        /**
 878         * we rely on the DVB API definition where exactly one complete
 879         * section is delivered in buffer1
 880         */
 881        dvb_net_sec (dev, buffer1, buffer1_len);
 882        return 0;
 883}
 884
 885static int dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
 886{
 887        dev_kfree_skb(skb);
 888        return NETDEV_TX_OK;
 889}
 890
 891static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 892static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
 893static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
 894static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
 895
 896static int dvb_net_filter_sec_set(struct net_device *dev,
 897                   struct dmx_section_filter **secfilter,
 898                   u8 *mac, u8 *mac_mask)
 899{
 900        struct dvb_net_priv *priv = netdev_priv(dev);
 901        int ret;
 902
 903        *secfilter=NULL;
 904        ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
 905        if (ret<0) {
 906                printk("%s: could not get filter\n", dev->name);
 907                return ret;
 908        }
 909
 910        (*secfilter)->priv=(void *) dev;
 911
 912        memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
 913        memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
 914        memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
 915
 916        (*secfilter)->filter_value[0]=0x3e;
 917        (*secfilter)->filter_value[3]=mac[5];
 918        (*secfilter)->filter_value[4]=mac[4];
 919        (*secfilter)->filter_value[8]=mac[3];
 920        (*secfilter)->filter_value[9]=mac[2];
 921        (*secfilter)->filter_value[10]=mac[1];
 922        (*secfilter)->filter_value[11]=mac[0];
 923
 924        (*secfilter)->filter_mask[0] = 0xff;
 925        (*secfilter)->filter_mask[3] = mac_mask[5];
 926        (*secfilter)->filter_mask[4] = mac_mask[4];
 927        (*secfilter)->filter_mask[8] = mac_mask[3];
 928        (*secfilter)->filter_mask[9] = mac_mask[2];
 929        (*secfilter)->filter_mask[10] = mac_mask[1];
 930        (*secfilter)->filter_mask[11]=mac_mask[0];
 931
 932        netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
 933
 934        return 0;
 935}
 936
 937static int dvb_net_feed_start(struct net_device *dev)
 938{
 939        int ret = 0, i;
 940        struct dvb_net_priv *priv = netdev_priv(dev);
 941        struct dmx_demux *demux = priv->demux;
 942        unsigned char *mac = (unsigned char *) dev->dev_addr;
 943
 944        netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
 945        mutex_lock(&priv->mutex);
 946        if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
 947                printk("%s: BUG %d\n", __func__, __LINE__);
 948
 949        priv->secfeed=NULL;
 950        priv->secfilter=NULL;
 951        priv->tsfeed = NULL;
 952
 953        if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
 954                netdev_dbg(dev, "alloc secfeed\n");
 955                ret=demux->allocate_section_feed(demux, &priv->secfeed,
 956                                         dvb_net_sec_callback);
 957                if (ret<0) {
 958                        printk("%s: could not allocate section feed\n", dev->name);
 959                        goto error;
 960                }
 961
 962                ret = priv->secfeed->set(priv->secfeed, priv->pid, 32768, 1);
 963
 964                if (ret<0) {
 965                        printk("%s: could not set section feed\n", dev->name);
 966                        priv->demux->release_section_feed(priv->demux, priv->secfeed);
 967                        priv->secfeed=NULL;
 968                        goto error;
 969                }
 970
 971                if (priv->rx_mode != RX_MODE_PROMISC) {
 972                        netdev_dbg(dev, "set secfilter\n");
 973                        dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
 974                }
 975
 976                switch (priv->rx_mode) {
 977                case RX_MODE_MULTI:
 978                        for (i = 0; i < priv->multi_num; i++) {
 979                                netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
 980                                dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
 981                                                       priv->multi_macs[i], mask_normal);
 982                        }
 983                        break;
 984                case RX_MODE_ALL_MULTI:
 985                        priv->multi_num=1;
 986                        netdev_dbg(dev, "set multi_secfilter[0]\n");
 987                        dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
 988                                               mac_allmulti, mask_allmulti);
 989                        break;
 990                case RX_MODE_PROMISC:
 991                        priv->multi_num=0;
 992                        netdev_dbg(dev, "set secfilter\n");
 993                        dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
 994                        break;
 995                }
 996
 997                netdev_dbg(dev, "start filtering\n");
 998                priv->secfeed->start_filtering(priv->secfeed);
 999        } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1000                ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
1001
1002                /* we have payloads encapsulated in TS */
1003                netdev_dbg(dev, "alloc tsfeed\n");
1004                ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1005                if (ret < 0) {
1006                        printk("%s: could not allocate ts feed\n", dev->name);
1007                        goto error;
1008                }
1009
1010                /* Set netdevice pointer for ts decaps callback. */
1011                priv->tsfeed->priv = (void *)dev;
1012                ret = priv->tsfeed->set(priv->tsfeed,
1013                                        priv->pid, /* pid */
1014                                        TS_PACKET, /* type */
1015                                        DMX_PES_OTHER, /* pes type */
1016                                        32768,     /* circular buffer size */
1017                                        timeout    /* timeout */
1018                                        );
1019
1020                if (ret < 0) {
1021                        printk("%s: could not set ts feed\n", dev->name);
1022                        priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1023                        priv->tsfeed = NULL;
1024                        goto error;
1025                }
1026
1027                netdev_dbg(dev, "start filtering\n");
1028                priv->tsfeed->start_filtering(priv->tsfeed);
1029        } else
1030                ret = -EINVAL;
1031
1032error:
1033        mutex_unlock(&priv->mutex);
1034        return ret;
1035}
1036
1037static int dvb_net_feed_stop(struct net_device *dev)
1038{
1039        struct dvb_net_priv *priv = netdev_priv(dev);
1040        int i, ret = 0;
1041
1042        mutex_lock(&priv->mutex);
1043        if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1044                if (priv->secfeed) {
1045                        if (priv->secfeed->is_filtering) {
1046                                netdev_dbg(dev, "stop secfeed\n");
1047                                priv->secfeed->stop_filtering(priv->secfeed);
1048                        }
1049
1050                        if (priv->secfilter) {
1051                                netdev_dbg(dev, "release secfilter\n");
1052                                priv->secfeed->release_filter(priv->secfeed,
1053                                                              priv->secfilter);
1054                                priv->secfilter=NULL;
1055                        }
1056
1057                        for (i=0; i<priv->multi_num; i++) {
1058                                if (priv->multi_secfilter[i]) {
1059                                        netdev_dbg(dev, "release multi_filter[%d]\n",
1060                                                   i);
1061                                        priv->secfeed->release_filter(priv->secfeed,
1062                                                                      priv->multi_secfilter[i]);
1063                                        priv->multi_secfilter[i] = NULL;
1064                                }
1065                        }
1066
1067                        priv->demux->release_section_feed(priv->demux, priv->secfeed);
1068                        priv->secfeed = NULL;
1069                } else
1070                        printk("%s: no feed to stop\n", dev->name);
1071        } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1072                if (priv->tsfeed) {
1073                        if (priv->tsfeed->is_filtering) {
1074                                netdev_dbg(dev, "stop tsfeed\n");
1075                                priv->tsfeed->stop_filtering(priv->tsfeed);
1076                        }
1077                        priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1078                        priv->tsfeed = NULL;
1079                }
1080                else
1081                        printk("%s: no ts feed to stop\n", dev->name);
1082        } else
1083                ret = -EINVAL;
1084        mutex_unlock(&priv->mutex);
1085        return ret;
1086}
1087
1088
1089static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1090{
1091        struct dvb_net_priv *priv = netdev_priv(dev);
1092
1093        if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1094                return -ENOMEM;
1095
1096        memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1097
1098        priv->multi_num++;
1099        return 0;
1100}
1101
1102
1103static void wq_set_multicast_list (struct work_struct *work)
1104{
1105        struct dvb_net_priv *priv =
1106                container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1107        struct net_device *dev = priv->net;
1108
1109        dvb_net_feed_stop(dev);
1110        priv->rx_mode = RX_MODE_UNI;
1111        netif_addr_lock_bh(dev);
1112
1113        if (dev->flags & IFF_PROMISC) {
1114                netdev_dbg(dev, "promiscuous mode\n");
1115                priv->rx_mode = RX_MODE_PROMISC;
1116        } else if ((dev->flags & IFF_ALLMULTI)) {
1117                netdev_dbg(dev, "allmulti mode\n");
1118                priv->rx_mode = RX_MODE_ALL_MULTI;
1119        } else if (!netdev_mc_empty(dev)) {
1120                struct netdev_hw_addr *ha;
1121
1122                netdev_dbg(dev, "set_mc_list, %d entries\n",
1123                           netdev_mc_count(dev));
1124
1125                priv->rx_mode = RX_MODE_MULTI;
1126                priv->multi_num = 0;
1127
1128                netdev_for_each_mc_addr(ha, dev)
1129                        dvb_set_mc_filter(dev, ha->addr);
1130        }
1131
1132        netif_addr_unlock_bh(dev);
1133        dvb_net_feed_start(dev);
1134}
1135
1136
1137static void dvb_net_set_multicast_list (struct net_device *dev)
1138{
1139        struct dvb_net_priv *priv = netdev_priv(dev);
1140        schedule_work(&priv->set_multicast_list_wq);
1141}
1142
1143
1144static void wq_restart_net_feed (struct work_struct *work)
1145{
1146        struct dvb_net_priv *priv =
1147                container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1148        struct net_device *dev = priv->net;
1149
1150        if (netif_running(dev)) {
1151                dvb_net_feed_stop(dev);
1152                dvb_net_feed_start(dev);
1153        }
1154}
1155
1156
1157static int dvb_net_set_mac (struct net_device *dev, void *p)
1158{
1159        struct dvb_net_priv *priv = netdev_priv(dev);
1160        struct sockaddr *addr=p;
1161
1162        memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
1163
1164        if (netif_running(dev))
1165                schedule_work(&priv->restart_net_feed_wq);
1166
1167        return 0;
1168}
1169
1170
1171static int dvb_net_open(struct net_device *dev)
1172{
1173        struct dvb_net_priv *priv = netdev_priv(dev);
1174
1175        priv->in_use++;
1176        dvb_net_feed_start(dev);
1177        return 0;
1178}
1179
1180
1181static int dvb_net_stop(struct net_device *dev)
1182{
1183        struct dvb_net_priv *priv = netdev_priv(dev);
1184
1185        priv->in_use--;
1186        return dvb_net_feed_stop(dev);
1187}
1188
1189static const struct header_ops dvb_header_ops = {
1190        .create         = eth_header,
1191        .parse          = eth_header_parse,
1192};
1193
1194
1195static const struct net_device_ops dvb_netdev_ops = {
1196        .ndo_open               = dvb_net_open,
1197        .ndo_stop               = dvb_net_stop,
1198        .ndo_start_xmit         = dvb_net_tx,
1199        .ndo_set_rx_mode        = dvb_net_set_multicast_list,
1200        .ndo_set_mac_address    = dvb_net_set_mac,
1201        .ndo_change_mtu         = eth_change_mtu,
1202        .ndo_validate_addr      = eth_validate_addr,
1203};
1204
1205static void dvb_net_setup(struct net_device *dev)
1206{
1207        ether_setup(dev);
1208
1209        dev->header_ops         = &dvb_header_ops;
1210        dev->netdev_ops         = &dvb_netdev_ops;
1211        dev->mtu                = 4096;
1212
1213        dev->flags |= IFF_NOARP;
1214}
1215
1216static int get_if(struct dvb_net *dvbnet)
1217{
1218        int i;
1219
1220        for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1221                if (!dvbnet->state[i])
1222                        break;
1223
1224        if (i == DVB_NET_DEVICES_MAX)
1225                return -1;
1226
1227        dvbnet->state[i]=1;
1228        return i;
1229}
1230
1231static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1232{
1233        struct net_device *net;
1234        struct dvb_net_priv *priv;
1235        int result;
1236        int if_num;
1237
1238        if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1239                return -EINVAL;
1240        if ((if_num = get_if(dvbnet)) < 0)
1241                return -EINVAL;
1242
1243        net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1244                           NET_NAME_UNKNOWN, dvb_net_setup);
1245        if (!net)
1246                return -ENOMEM;
1247
1248        if (dvbnet->dvbdev->id)
1249                snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1250                         dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1251        else
1252                /* compatibility fix to keep dvb0_0 format */
1253                snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1254                         dvbnet->dvbdev->adapter->num, if_num);
1255
1256        net->addr_len = 6;
1257        memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);
1258
1259        dvbnet->device[if_num] = net;
1260
1261        priv = netdev_priv(net);
1262        priv->net = net;
1263        priv->demux = dvbnet->demux;
1264        priv->pid = pid;
1265        priv->rx_mode = RX_MODE_UNI;
1266        priv->need_pusi = 1;
1267        priv->tscc = 0;
1268        priv->feedtype = feedtype;
1269        reset_ule(priv);
1270
1271        INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1272        INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1273        mutex_init(&priv->mutex);
1274
1275        net->base_addr = pid;
1276
1277        if ((result = register_netdev(net)) < 0) {
1278                dvbnet->device[if_num] = NULL;
1279                free_netdev(net);
1280                return result;
1281        }
1282        printk("dvb_net: created network interface %s\n", net->name);
1283
1284        return if_num;
1285}
1286
1287static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1288{
1289        struct net_device *net = dvbnet->device[num];
1290        struct dvb_net_priv *priv;
1291
1292        if (!dvbnet->state[num])
1293                return -EINVAL;
1294        priv = netdev_priv(net);
1295        if (priv->in_use)
1296                return -EBUSY;
1297
1298        dvb_net_stop(net);
1299        flush_work(&priv->set_multicast_list_wq);
1300        flush_work(&priv->restart_net_feed_wq);
1301        printk("dvb_net: removed network interface %s\n", net->name);
1302        unregister_netdev(net);
1303        dvbnet->state[num]=0;
1304        dvbnet->device[num] = NULL;
1305        free_netdev(net);
1306
1307        return 0;
1308}
1309
1310static int dvb_net_do_ioctl(struct file *file,
1311                  unsigned int cmd, void *parg)
1312{
1313        struct dvb_device *dvbdev = file->private_data;
1314        struct dvb_net *dvbnet = dvbdev->priv;
1315        int ret = 0;
1316
1317        if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1318                return -EPERM;
1319
1320        if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1321                return -ERESTARTSYS;
1322
1323        switch (cmd) {
1324        case NET_ADD_IF:
1325        {
1326                struct dvb_net_if *dvbnetif = parg;
1327                int result;
1328
1329                if (!capable(CAP_SYS_ADMIN)) {
1330                        ret = -EPERM;
1331                        goto ioctl_error;
1332                }
1333
1334                if (!try_module_get(dvbdev->adapter->module)) {
1335                        ret = -EPERM;
1336                        goto ioctl_error;
1337                }
1338
1339                result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1340                if (result<0) {
1341                        module_put(dvbdev->adapter->module);
1342                        ret = result;
1343                        goto ioctl_error;
1344                }
1345                dvbnetif->if_num=result;
1346                break;
1347        }
1348        case NET_GET_IF:
1349        {
1350                struct net_device *netdev;
1351                struct dvb_net_priv *priv_data;
1352                struct dvb_net_if *dvbnetif = parg;
1353
1354                if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
1355                    !dvbnet->state[dvbnetif->if_num]) {
1356                        ret = -EINVAL;
1357                        goto ioctl_error;
1358                }
1359
1360                netdev = dvbnet->device[dvbnetif->if_num];
1361
1362                priv_data = netdev_priv(netdev);
1363                dvbnetif->pid=priv_data->pid;
1364                dvbnetif->feedtype=priv_data->feedtype;
1365                break;
1366        }
1367        case NET_REMOVE_IF:
1368        {
1369                if (!capable(CAP_SYS_ADMIN)) {
1370                        ret = -EPERM;
1371                        goto ioctl_error;
1372                }
1373                if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1374                        ret = -EINVAL;
1375                        goto ioctl_error;
1376                }
1377                ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1378                if (!ret)
1379                        module_put(dvbdev->adapter->module);
1380                break;
1381        }
1382
1383        /* binary compatibility cruft */
1384        case __NET_ADD_IF_OLD:
1385        {
1386                struct __dvb_net_if_old *dvbnetif = parg;
1387                int result;
1388
1389                if (!capable(CAP_SYS_ADMIN)) {
1390                        ret = -EPERM;
1391                        goto ioctl_error;
1392                }
1393
1394                if (!try_module_get(dvbdev->adapter->module)) {
1395                        ret = -EPERM;
1396                        goto ioctl_error;
1397                }
1398
1399                result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1400                if (result<0) {
1401                        module_put(dvbdev->adapter->module);
1402                        ret = result;
1403                        goto ioctl_error;
1404                }
1405                dvbnetif->if_num=result;
1406                break;
1407        }
1408        case __NET_GET_IF_OLD:
1409        {
1410                struct net_device *netdev;
1411                struct dvb_net_priv *priv_data;
1412                struct __dvb_net_if_old *dvbnetif = parg;
1413
1414                if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
1415                    !dvbnet->state[dvbnetif->if_num]) {
1416                        ret = -EINVAL;
1417                        goto ioctl_error;
1418                }
1419
1420                netdev = dvbnet->device[dvbnetif->if_num];
1421
1422                priv_data = netdev_priv(netdev);
1423                dvbnetif->pid=priv_data->pid;
1424                break;
1425        }
1426        default:
1427                ret = -ENOTTY;
1428                break;
1429        }
1430
1431ioctl_error:
1432        mutex_unlock(&dvbnet->ioctl_mutex);
1433        return ret;
1434}
1435
1436static long dvb_net_ioctl(struct file *file,
1437              unsigned int cmd, unsigned long arg)
1438{
1439        return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1440}
1441
1442static int dvb_net_close(struct inode *inode, struct file *file)
1443{
1444        struct dvb_device *dvbdev = file->private_data;
1445        struct dvb_net *dvbnet = dvbdev->priv;
1446
1447        dvb_generic_release(inode, file);
1448
1449        if(dvbdev->users == 1 && dvbnet->exit == 1)
1450                wake_up(&dvbdev->wait_queue);
1451        return 0;
1452}
1453
1454
1455static const struct file_operations dvb_net_fops = {
1456        .owner = THIS_MODULE,
1457        .unlocked_ioctl = dvb_net_ioctl,
1458        .open = dvb_generic_open,
1459        .release = dvb_net_close,
1460        .llseek = noop_llseek,
1461};
1462
1463static const struct dvb_device dvbdev_net = {
1464        .priv = NULL,
1465        .users = 1,
1466        .writers = 1,
1467#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1468        .name = "dvb-net",
1469#endif
1470        .fops = &dvb_net_fops,
1471};
1472
1473void dvb_net_release (struct dvb_net *dvbnet)
1474{
1475        int i;
1476
1477        dvbnet->exit = 1;
1478        if (dvbnet->dvbdev->users < 1)
1479                wait_event(dvbnet->dvbdev->wait_queue,
1480                                dvbnet->dvbdev->users==1);
1481
1482        dvb_unregister_device(dvbnet->dvbdev);
1483
1484        for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1485                if (!dvbnet->state[i])
1486                        continue;
1487                dvb_net_remove_if(dvbnet, i);
1488        }
1489}
1490EXPORT_SYMBOL(dvb_net_release);
1491
1492
1493int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1494                  struct dmx_demux *dmx)
1495{
1496        int i;
1497
1498        mutex_init(&dvbnet->ioctl_mutex);
1499        dvbnet->demux = dmx;
1500
1501        for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1502                dvbnet->state[i] = 0;
1503
1504        return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1505                             dvbnet, DVB_DEVICE_NET, 0);
1506}
1507EXPORT_SYMBOL(dvb_net_init);
1508