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dvb_net.c

/*
 * dvb_net.c
 *
 * Copyright (C) 2001 Convergence integrated media GmbH
 *                    Ralph Metzler <ralph@convergence.de>
 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
 *
 * ULE Decapsulation code:
 * Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
 *                      and Department of Scientific Computing
 *                          Paris Lodron University of Salzburg.
 *                          Hilmar Linder <hlinder@cosy.sbg.ac.at>
 *                      and Wolfram Stering <wstering@cosy.sbg.ac.at>
 *
 * ULE Decaps according to RFC 4326.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
 */

/*
 * ULE ChangeLog:
 * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
 *
 * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
 *                       ULE Extension header handling.
 *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
 *                       Fraunhofer Institute for Open Communication Systems
 *                       Competence Center for Advanced Satellite Communications.
 *                     Bugfixes and robustness improvements.
 *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
 *                     ULE_DEBUG compile-time option.
 * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
 *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
 *                       Paris Lodron University of Salzburg.
 */

/*
 * FIXME / TODO (dvb_net.c):
 *
 * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/dvb/net.h>
#include <linux/uio.h>
#include <asm/uaccess.h>
#include <linux/crc32.h>
#include <linux/mutex.h>

#include "dvb_demux.h"
#include "dvb_net.h"

static int dvb_net_debug;
module_param(dvb_net_debug, int, 0444);
MODULE_PARM_DESC(dvb_net_debug, "enable debug messages");

#define dprintk(x...) do { if (dvb_net_debug) printk(x); } while (0)


static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
{
      unsigned int j;
      for (j = 0; j < cnt; j++)
            c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
      return c;
}


#define DVB_NET_MULTICAST_MAX 10

#undef ULE_DEBUG

#ifdef ULE_DEBUG

#define MAC_ADDR_PRINTFMT "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x"
#define MAX_ADDR_PRINTFMT_ARGS(macap) (macap)[0],(macap)[1],(macap)[2],(macap)[3],(macap)[4],(macap)[5]

#define isprint(c)      ((c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || (c >= '0' && c <= '9'))

static void hexdump( const unsigned char *buf, unsigned short len )
{
      char str[80], octet[10];
      int ofs, i, l;

      for (ofs = 0; ofs < len; ofs += 16) {
            sprintf( str, "%03d: ", ofs );

            for (i = 0; i < 16; i++) {
                  if ((i + ofs) < len)
                        sprintf( octet, "%02x ", buf[ofs + i] );
                  else
                        strcpy( octet, "   " );

                  strcat( str, octet );
            }
            strcat( str, "  " );
            l = strlen( str );

            for (i = 0; (i < 16) && ((i + ofs) < len); i++)
                  str[l++] = isprint( buf[ofs + i] ) ? buf[ofs + i] : '.';

            str[l] = '\0';
            printk( KERN_WARNING "%s\n", str );
      }
}

#endif

struct dvb_net_priv {
      int in_use;
      struct net_device_stats stats;
      u16 pid;
      struct net_device *net;
      struct dvb_net *host;
      struct dmx_demux *demux;
      struct dmx_section_feed *secfeed;
      struct dmx_section_filter *secfilter;
      struct dmx_ts_feed *tsfeed;
      int multi_num;
      struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
      unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
      int rx_mode;
#define RX_MODE_UNI 0
#define RX_MODE_MULTI 1
#define RX_MODE_ALL_MULTI 2
#define RX_MODE_PROMISC 3
      struct work_struct set_multicast_list_wq;
      struct work_struct restart_net_feed_wq;
      unsigned char feedtype;             /* Either FEED_TYPE_ or FEED_TYPE_ULE */
      int need_pusi;                      /* Set to 1, if synchronization on PUSI required. */
      unsigned char tscc;                 /* TS continuity counter after sync on PUSI. */
      struct sk_buff *ule_skb;            /* ULE SNDU decodes into this buffer. */
      unsigned char *ule_next_hdr;        /* Pointer into skb to next ULE extension header. */
      unsigned short ule_sndu_len;        /* ULE SNDU length in bytes, w/o D-Bit. */
      unsigned short ule_sndu_type;       /* ULE SNDU type field, complete. */
      unsigned char ule_sndu_type_1;            /* ULE SNDU type field, if split across 2 TS cells. */
      unsigned char ule_dbit;             /* Whether the DestMAC address present
                                     * or not (bit is set). */
      unsigned char ule_bridged;          /* Whether the ULE_BRIDGED extension header was found. */
      int ule_sndu_remain;                /* Nr. of bytes still required for current ULE SNDU. */
      unsigned long ts_count;             /* Current ts cell counter. */
      struct mutex mutex;
};


/**
 *    Determine the packet's protocol ID. The rule here is that we
 *    assume 802.3 if the type field is short enough to be a length.
 *    This is normal practice and works for any 'now in use' protocol.
 *
 *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 *  by Michael Holzt <kju@debian.org>
 */
static unsigned short dvb_net_eth_type_trans(struct sk_buff *skb,
                              struct net_device *dev)
{
      struct ethhdr *eth;
      unsigned char *rawp;

      skb_reset_mac_header(skb);
      skb_pull(skb,dev->hard_header_len);
      eth = eth_hdr(skb);

      if (*eth->h_dest & 1) {
            if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
                  skb->pkt_type=PACKET_BROADCAST;
            else
                  skb->pkt_type=PACKET_MULTICAST;
      }

      if (ntohs(eth->h_proto) >= 1536)
            return eth->h_proto;

      rawp = skb->data;

      /**
       *    This is a magic hack to spot IPX packets. Older Novell breaks
       *    the protocol design and runs IPX over 802.3 without an 802.2 LLC
       *    layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
       *    won't work for fault tolerant netware but does for the rest.
       */
      if (*(unsigned short *)rawp == 0xFFFF)
            return htons(ETH_P_802_3);

      /**
       *    Real 802.2 LLC
       */
      return htons(ETH_P_802_2);
}

#define TS_SZ     188
#define TS_SYNC   0x47
#define TS_TEI    0x80
#define TS_SC     0xC0
#define TS_PUSI   0x40
#define TS_AF_A   0x20
#define TS_AF_D   0x10

/* ULE Extension Header handlers. */

#define ULE_TEST  0
#define ULE_BRIDGED     1

#define ULE_OPTEXTHDR_PADDING 0

static int ule_test_sndu( struct dvb_net_priv *p )
{
      return -1;
}

static int ule_bridged_sndu( struct dvb_net_priv *p )
{
      struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
      if(ntohs(hdr->h_proto) < 1536) {
            int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
            /* A frame Type < 1536 for a bridged frame, introduces a LLC Length field. */
            if(framelen != ntohs(hdr->h_proto)) {
                  return -1;
            }
      }
      /* Note:
       * From RFC4326:
       *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
       *   It must be the final (or only) extension header specified in the header chain of a SNDU."
       * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
       */
      p->ule_bridged = 1;
      return 0;
}

static int ule_exthdr_padding(struct dvb_net_priv *p)
{
      return 0;
}

/** Handle ULE extension headers.
 *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 *  Returns: >= 0: nr. of bytes consumed by next extension header
 *         -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 */
static int handle_one_ule_extension( struct dvb_net_priv *p )
{
      /* Table of mandatory extension header handlers.  The header type is the index. */
      static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
            { [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };

      /* Table of optional extension header handlers.  The header type is the index. */
      static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
            { [0] = ule_exthdr_padding, [1] = NULL, };

      int ext_len = 0;
      unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
      unsigned char htype = p->ule_sndu_type & 0x00FF;

      /* Discriminate mandatory and optional extension headers. */
      if (hlen == 0) {
            /* Mandatory extension header */
            if (ule_mandatory_ext_handlers[htype]) {
                  ext_len = ule_mandatory_ext_handlers[htype]( p );
                  if(ext_len >= 0) {
                        p->ule_next_hdr += ext_len;
                        if (!p->ule_bridged) {
                              p->ule_sndu_type = ntohs(*(unsigned short *)p->ule_next_hdr);
                              p->ule_next_hdr += 2;
                        } else {
                              p->ule_sndu_type = ntohs(*(unsigned short *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
                              /* This assures the extension handling loop will terminate. */
                        }
                  }
                  // else: extension handler failed or SNDU should be discarded
            } else
                  ext_len = -1;     /* SNDU has to be discarded. */
      } else {
            /* Optional extension header.  Calculate the length. */
            ext_len = hlen << 1;
            /* Process the optional extension header according to its type. */
            if (ule_optional_ext_handlers[htype])
                  (void)ule_optional_ext_handlers[htype]( p );
            p->ule_next_hdr += ext_len;
            p->ule_sndu_type = ntohs( *(unsigned short *)(p->ule_next_hdr-2) );
            /*
             * note: the length of the next header type is included in the
             * length of THIS optional extension header
             */
      }

      return ext_len;
}

static int handle_ule_extensions( struct dvb_net_priv *p )
{
      int total_ext_len = 0, l;

      p->ule_next_hdr = p->ule_skb->data;
      do {
            l = handle_one_ule_extension( p );
            if (l < 0)
                  return l;   /* Stop extension header processing and discard SNDU. */
            total_ext_len += l;
#ifdef ULE_DEBUG
            dprintk("handle_ule_extensions: ule_next_hdr=%p, ule_sndu_type=%i, "
                  "l=%i, total_ext_len=%i\n", p->ule_next_hdr,
                  (int) p->ule_sndu_type, l, total_ext_len);
#endif

      } while (p->ule_sndu_type < 1536);

      return total_ext_len;
}


/** Prepare for a new ULE SNDU: reset the decoder state. */
static inline void reset_ule( struct dvb_net_priv *p )
{
      p->ule_skb = NULL;
      p->ule_next_hdr = NULL;
      p->ule_sndu_len = 0;
      p->ule_sndu_type = 0;
      p->ule_sndu_type_1 = 0;
      p->ule_sndu_remain = 0;
      p->ule_dbit = 0xFF;
      p->ule_bridged = 0;
}

/**
 * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 * TS cells of a single PID.
 */
static void dvb_net_ule( struct net_device *dev, const u8 *buf, size_t buf_len )
{
      struct dvb_net_priv *priv = dev->priv;
      unsigned long skipped = 0L;
      const u8 *ts, *ts_end, *from_where = NULL;
      u8 ts_remain = 0, how_much = 0, new_ts = 1;
      struct ethhdr *ethh = NULL;

#ifdef ULE_DEBUG
      /* The code inside ULE_DEBUG keeps a history of the last 100 TS cells processed. */
      static unsigned char ule_hist[100*TS_SZ];
      static unsigned char *ule_where = ule_hist, ule_dump = 0;
#endif

      /* For all TS cells in current buffer.
       * Appearently, we are called for every single TS cell.
       */
      for (ts = buf, ts_end = buf + buf_len; ts < ts_end; /* no default incr. */ ) {

            if (new_ts) {
                  /* We are about to process a new TS cell. */

#ifdef ULE_DEBUG
                  if (ule_where >= &ule_hist[100*TS_SZ]) ule_where = ule_hist;
                  memcpy( ule_where, ts, TS_SZ );
                  if (ule_dump) {
                        hexdump( ule_where, TS_SZ );
                        ule_dump = 0;
                  }
                  ule_where += TS_SZ;
#endif

                  /* Check TS error conditions: sync_byte, transport_error_indicator, scrambling_control . */
                  if ((ts[0] != TS_SYNC) || (ts[1] & TS_TEI) || ((ts[3] & TS_SC) != 0)) {
                        printk(KERN_WARNING "%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
                               priv->ts_count, ts[0], ts[1] & TS_TEI >> 7, ts[3] & 0xC0 >> 6);

                        /* Drop partly decoded SNDU, reset state, resync on PUSI. */
                        if (priv->ule_skb) {
                              dev_kfree_skb( priv->ule_skb );
                              /* Prepare for next SNDU. */
                              priv->stats.rx_errors++;
                              priv->stats.rx_frame_errors++;
                        }
                        reset_ule(priv);
                        priv->need_pusi = 1;

                        /* Continue with next TS cell. */
                        ts += TS_SZ;
                        priv->ts_count++;
                        continue;
                  }

                  ts_remain = 184;
                  from_where = ts + 4;
            }
            /* Synchronize on PUSI, if required. */
            if (priv->need_pusi) {
                  if (ts[1] & TS_PUSI) {
                        /* Find beginning of first ULE SNDU in current TS cell. */
                        /* Synchronize continuity counter. */
                        priv->tscc = ts[3] & 0x0F;
                        /* There is a pointer field here. */
                        if (ts[4] > ts_remain) {
                              printk(KERN_ERR "%lu: Invalid ULE packet "
                                     "(pointer field %d)\n", priv->ts_count, ts[4]);
                              ts += TS_SZ;
                              priv->ts_count++;
                              continue;
                        }
                        /* Skip to destination of pointer field. */
                        from_where = &ts[5] + ts[4];
                        ts_remain -= 1 + ts[4];
                        skipped = 0;
                  } else {
                        skipped++;
                        ts += TS_SZ;
                        priv->ts_count++;
                        continue;
                  }
            }

            if (new_ts) {
                  /* Check continuity counter. */
                  if ((ts[3] & 0x0F) == priv->tscc)
                        priv->tscc = (priv->tscc + 1) & 0x0F;
                  else {
                        /* TS discontinuity handling: */
                        printk(KERN_WARNING "%lu: TS discontinuity: got %#x, "
                               "expected %#x.\n", priv->ts_count, ts[3] & 0x0F, priv->tscc);
                        /* Drop partly decoded SNDU, reset state, resync on PUSI. */
                        if (priv->ule_skb) {
                              dev_kfree_skb( priv->ule_skb );
                              /* Prepare for next SNDU. */
                              // reset_ule(priv);  moved to below.
                              priv->stats.rx_errors++;
                              priv->stats.rx_frame_errors++;
                        }
                        reset_ule(priv);
                        /* skip to next PUSI. */
                        priv->need_pusi = 1;
                        continue;
                  }
                  /* If we still have an incomplete payload, but PUSI is
                   * set; some TS cells are missing.
                   * This is only possible here, if we missed exactly 16 TS
                   * cells (continuity counter wrap). */
                  if (ts[1] & TS_PUSI) {
                        if (! priv->need_pusi) {
                              if (!(*from_where < (ts_remain-1)) || *from_where != priv->ule_sndu_remain) {
                                    /* Pointer field is invalid.  Drop this TS cell and any started ULE SNDU. */
                                    printk(KERN_WARNING "%lu: Invalid pointer "
                                           "field: %u.\n", priv->ts_count, *from_where);

                                    /* Drop partly decoded SNDU, reset state, resync on PUSI. */
                                    if (priv->ule_skb) {
                                          dev_kfree_skb( priv->ule_skb );
                                          ((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
                                          ((struct dvb_net_priv *) dev->priv)->stats.rx_frame_errors++;
                                    }
                                    reset_ule(priv);
                                    priv->need_pusi = 1;
                                    continue;
                              }
                              /* Skip pointer field (we're processing a
                               * packed payload). */
                              from_where += 1;
                              ts_remain -= 1;
                        } else
                              priv->need_pusi = 0;

                        if (priv->ule_sndu_remain > 183) {
                              /* Current SNDU lacks more data than there could be available in the
                               * current TS cell. */
                              priv->stats.rx_errors++;
                              priv->stats.rx_length_errors++;
                              printk(KERN_WARNING "%lu: Expected %d more SNDU bytes, but "
                                     "got PUSI (pf %d, ts_remain %d).  Flushing incomplete payload.\n",
                                     priv->ts_count, priv->ule_sndu_remain, ts[4], ts_remain);
                              dev_kfree_skb(priv->ule_skb);
                              /* Prepare for next SNDU. */
                              reset_ule(priv);
                              /* Resync: go to where pointer field points to: start of next ULE SNDU. */
                              from_where += ts[4];
                              ts_remain -= ts[4];
                        }
                  }
            }

            /* Check if new payload needs to be started. */
            if (priv->ule_skb == NULL) {
                  /* Start a new payload with skb.
                   * Find ULE header.  It is only guaranteed that the
                   * length field (2 bytes) is contained in the current
                   * TS.
                   * Check ts_remain has to be >= 2 here. */
                  if (ts_remain < 2) {
                        printk(KERN_WARNING "Invalid payload packing: only %d "
                               "bytes left in TS.  Resyncing.\n", ts_remain);
                        priv->ule_sndu_len = 0;
                        priv->need_pusi = 1;
                        continue;
                  }

                  if (! priv->ule_sndu_len) {
                        /* Got at least two bytes, thus extrace the SNDU length. */
                        priv->ule_sndu_len = from_where[0] << 8 | from_where[1];
                        if (priv->ule_sndu_len & 0x8000) {
                              /* D-Bit is set: no dest mac present. */
                              priv->ule_sndu_len &= 0x7FFF;
                              priv->ule_dbit = 1;
                        } else
                              priv->ule_dbit = 0;

                        if (priv->ule_sndu_len < 5) {
                              printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
                                     "Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
                              priv->stats.rx_errors++;
                              priv->stats.rx_length_errors++;
                              priv->ule_sndu_len = 0;
                              priv->need_pusi = 1;
                              new_ts = 1;
                              ts += TS_SZ;
                              priv->ts_count++;
                              continue;
                        }
                        ts_remain -= 2;   /* consume the 2 bytes SNDU length. */
                        from_where += 2;
                  }

                  /*
                   * State of current TS:
                   *   ts_remain (remaining bytes in the current TS cell)
                   *   0      ule_type is not available now, we need the next TS cell
                   *   1      the first byte of the ule_type is present
                   * >=2      full ULE header present, maybe some payload data as well.
                   */
                  switch (ts_remain) {
                        case 1:
                              priv->ule_sndu_type = from_where[0] << 8;
                              priv->ule_sndu_type_1 = 1; /* first byte of ule_type is set. */
                              ts_remain -= 1; from_where += 1;
                              /* Continue w/ next TS. */
                        case 0:
                              new_ts = 1;
                              ts += TS_SZ;
                              priv->ts_count++;
                              continue;

                        default: /* complete ULE header is present in current TS. */
                              /* Extract ULE type field. */
                              if (priv->ule_sndu_type_1) {
                                    priv->ule_sndu_type |= from_where[0];
                                    from_where += 1; /* points to payload start. */
                                    ts_remain -= 1;
                              } else {
                                    /* Complete type is present in new TS. */
                                    priv->ule_sndu_type = from_where[0] << 8 | from_where[1];
                                    from_where += 2; /* points to payload start. */
                                    ts_remain -= 2;
                              }
                              break;
                  }

                  /* Allocate the skb (decoder target buffer) with the correct size, as follows:
                   * prepare for the largest case: bridged SNDU with MAC address (dbit = 0). */
                  priv->ule_skb = dev_alloc_skb( priv->ule_sndu_len + ETH_HLEN + ETH_ALEN );
                  if (priv->ule_skb == NULL) {
                        printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
                               dev->name);
                        ((struct dvb_net_priv *)dev->priv)->stats.rx_dropped++;
                        return;
                  }

                  /* This includes the CRC32 _and_ dest mac, if !dbit. */
                  priv->ule_sndu_remain = priv->ule_sndu_len;
                  priv->ule_skb->dev = dev;
                  /* Leave space for Ethernet or bridged SNDU header (eth hdr plus one MAC addr). */
                  skb_reserve( priv->ule_skb, ETH_HLEN + ETH_ALEN );
            }

            /* Copy data into our current skb. */
            how_much = min(priv->ule_sndu_remain, (int)ts_remain);
            memcpy(skb_put(priv->ule_skb, how_much), from_where, how_much);
            priv->ule_sndu_remain -= how_much;
            ts_remain -= how_much;
            from_where += how_much;

            /* Check for complete payload. */
            if (priv->ule_sndu_remain <= 0) {
                  /* Check CRC32, we've got it in our skb already. */
                  unsigned short ulen = htons(priv->ule_sndu_len);
                  unsigned short utype = htons(priv->ule_sndu_type);
                  const u8 *tail;
                  struct kvec iov[3] = {
                        { &ulen, sizeof ulen },
                        { &utype, sizeof utype },
                        { priv->ule_skb->data, priv->ule_skb->len - 4 }
                  };
                  u32 ule_crc = ~0L, expected_crc;
                  if (priv->ule_dbit) {
                        /* Set D-bit for CRC32 verification,
                         * if it was set originally. */
                        ulen |= 0x0080;
                  }

                  ule_crc = iov_crc32(ule_crc, iov, 3);
                  tail = skb_tail_pointer(priv->ule_skb);
                  expected_crc = *(tail - 4) << 24 |
                               *(tail - 3) << 16 |
                               *(tail - 2) << 8 |
                               *(tail - 1);
                  if (ule_crc != expected_crc) {
                        printk(KERN_WARNING "%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
                               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);

#ifdef ULE_DEBUG
                        hexdump( iov[0].iov_base, iov[0].iov_len );
                        hexdump( iov[1].iov_base, iov[1].iov_len );
                        hexdump( iov[2].iov_base, iov[2].iov_len );

                        if (ule_where == ule_hist) {
                              hexdump( &ule_hist[98*TS_SZ], TS_SZ );
                              hexdump( &ule_hist[99*TS_SZ], TS_SZ );
                        } else if (ule_where == &ule_hist[TS_SZ]) {
                              hexdump( &ule_hist[99*TS_SZ], TS_SZ );
                              hexdump( ule_hist, TS_SZ );
                        } else {
                              hexdump( ule_where - TS_SZ - TS_SZ, TS_SZ );
                              hexdump( ule_where - TS_SZ, TS_SZ );
                        }
                        ule_dump = 1;
#endif

                        priv->stats.rx_errors++;
                        priv->stats.rx_crc_errors++;
                        dev_kfree_skb(priv->ule_skb);
                  } else {
                        /* CRC32 verified OK. */
                        u8 dest_addr[ETH_ALEN];
                        static const u8 bc_addr[ETH_ALEN] =
                              { [ 0 ... ETH_ALEN-1] = 0xff };

                        /* CRC32 was OK. Remove it from skb. */
                        priv->ule_skb->tail -= 4;
                        priv->ule_skb->len -= 4;

                        if (!priv->ule_dbit) {
                              /*
                               * The destination MAC address is the
                               * next data in the skb.  It comes
                               * before any extension headers.
                               *
                               * Check if the payload of this SNDU
                               * should be passed up the stack.
                               */
                              register int drop = 0;
                              if (priv->rx_mode != RX_MODE_PROMISC) {
                                    if (priv->ule_skb->data[0] & 0x01) {
                                          /* multicast or broadcast */
                                          if (memcmp(priv->ule_skb->data, bc_addr, ETH_ALEN)) {
                                                /* multicast */
                                                if (priv->rx_mode == RX_MODE_MULTI) {
                                                      int i;
                                                      for(i = 0; i < priv->multi_num && memcmp(priv->ule_skb->data, priv->multi_macs[i], ETH_ALEN); i++)
                                                            ;
                                                      if (i == priv->multi_num)
                                                            drop = 1;
                                                } else if (priv->rx_mode != RX_MODE_ALL_MULTI)
                                                      drop = 1; /* no broadcast; */
                                                /* else: all multicast mode: accept all multicast packets */
                                          }
                                          /* else: broadcast */
                                    }
                                    else if (memcmp(priv->ule_skb->data, dev->dev_addr, ETH_ALEN))
                                          drop = 1;
                                    /* else: destination address matches the MAC address of our receiver device */
                              }
                              /* else: promiscious mode; pass everything up the stack */

                              if (drop) {
#ifdef ULE_DEBUG
                                    dprintk("Dropping SNDU: MAC destination address does not match: dest addr: "MAC_ADDR_PRINTFMT", dev addr: "MAC_ADDR_PRINTFMT"\n",
                                          MAX_ADDR_PRINTFMT_ARGS(priv->ule_skb->data), MAX_ADDR_PRINTFMT_ARGS(dev->dev_addr));
#endif
                                    dev_kfree_skb(priv->ule_skb);
                                    goto sndu_done;
                              }
                              else
                              {
                                    skb_copy_from_linear_data(priv->ule_skb,
                                                dest_addr,
                                                ETH_ALEN);
                                    skb_pull(priv->ule_skb, ETH_ALEN);
                              }
                        }

                        /* Handle ULE Extension Headers. */
                        if (priv->ule_sndu_type < 1536) {
                              /* There is an extension header.  Handle it accordingly. */
                              int l = handle_ule_extensions(priv);
                              if (l < 0) {
                                    /* Mandatory extension header unknown or TEST SNDU.  Drop it. */
                                    // printk( KERN_WARNING "Dropping SNDU, extension headers.\n" );
                                    dev_kfree_skb(priv->ule_skb);
                                    goto sndu_done;
                              }
                              skb_pull(priv->ule_skb, l);
                        }

                        /*
                         * Construct/assure correct ethernet header.
                         * Note: in bridged mode (priv->ule_bridged !=
                         * 0) we already have the (original) ethernet
                         * header at the start of the payload (after
                         * optional dest. address and any extension
                         * headers).
                         */

                        if (!priv->ule_bridged) {
                              skb_push(priv->ule_skb, ETH_HLEN);
                              ethh = (struct ethhdr *)priv->ule_skb->data;
                              if (!priv->ule_dbit) {
                                     /* dest_addr buffer is only valid if priv->ule_dbit == 0 */
                                    memcpy(ethh->h_dest, dest_addr, ETH_ALEN);
                                    memset(ethh->h_source, 0, ETH_ALEN);
                              }
                              else /* zeroize source and dest */
                                    memset( ethh, 0, ETH_ALEN*2 );

                              ethh->h_proto = htons(priv->ule_sndu_type);
                        }
                        /* else:  skb is in correct state; nothing to do. */
                        priv->ule_bridged = 0;

                        /* Stuff into kernel's protocol stack. */
                        priv->ule_skb->protocol = dvb_net_eth_type_trans(priv->ule_skb, dev);
                        /* If D-bit is set (i.e. destination MAC address not present),
                         * receive the packet anyhow. */
                        /* if (priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
                              priv->ule_skb->pkt_type = PACKET_HOST; */
                        priv->stats.rx_packets++;
                        priv->stats.rx_bytes += priv->ule_skb->len;
                        netif_rx(priv->ule_skb);
                  }
                  sndu_done:
                  /* Prepare for next SNDU. */
                  reset_ule(priv);
            }

            /* More data in current TS (look at the bytes following the CRC32)? */
            if (ts_remain >= 2 && *((unsigned short *)from_where) != 0xFFFF) {
                  /* Next ULE SNDU starts right there. */
                  new_ts = 0;
                  priv->ule_skb = NULL;
                  priv->ule_sndu_type_1 = 0;
                  priv->ule_sndu_len = 0;
                  // printk(KERN_WARNING "More data in current TS: [%#x %#x %#x %#x]\n",
                  //    *(from_where + 0), *(from_where + 1),
                  //    *(from_where + 2), *(from_where + 3));
                  // printk(KERN_WARNING "ts @ %p, stopped @ %p:\n", ts, from_where + 0);
                  // hexdump(ts, 188);
            } else {
                  new_ts = 1;
                  ts += TS_SZ;
                  priv->ts_count++;
                  if (priv->ule_skb == NULL) {
                        priv->need_pusi = 1;
                        priv->ule_sndu_type_1 = 0;
                        priv->ule_sndu_len = 0;
                  }
            }
      }     /* for all available TS cells */
}

static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
                         const u8 *buffer2, size_t buffer2_len,
                         struct dmx_ts_feed *feed, enum dmx_success success)
{
      struct net_device *dev = feed->priv;

      if (buffer2 != 0)
            printk(KERN_WARNING "buffer2 not 0: %p.\n", buffer2);
      if (buffer1_len > 32768)
            printk(KERN_WARNING "length > 32k: %zu.\n", buffer1_len);
      /* printk("TS callback: %u bytes, %u TS cells @ %p.\n",
              buffer1_len, buffer1_len / TS_SZ, buffer1); */
      dvb_net_ule(dev, buffer1, buffer1_len);
      return 0;
}


static void dvb_net_sec(struct net_device *dev,
                  const u8 *pkt, int pkt_len)
{
      u8 *eth;
      struct sk_buff *skb;
      struct net_device_stats *stats = &(((struct dvb_net_priv *) dev->priv)->stats);
      int snap = 0;

      /* note: pkt_len includes a 32bit checksum */
      if (pkt_len < 16) {
            printk("%s: IP/MPE packet length = %d too small.\n",
                  dev->name, pkt_len);
            stats->rx_errors++;
            stats->rx_length_errors++;
            return;
      }
/* it seems some ISPs manage to screw up here, so we have to
 * relax the error checks... */
#if 0
      if ((pkt[5] & 0xfd) != 0xc1) {
            /* drop scrambled or broken packets */
#else
      if ((pkt[5] & 0x3c) != 0x00) {
            /* drop scrambled */
#endif
            stats->rx_errors++;
            stats->rx_crc_errors++;
            return;
      }
      if (pkt[5] & 0x02) {
            /* handle LLC/SNAP, see rfc-1042 */
            if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
                  stats->rx_dropped++;
                  return;
            }
            snap = 8;
      }
      if (pkt[7]) {
            /* FIXME: assemble datagram from multiple sections */
            stats->rx_errors++;
            stats->rx_frame_errors++;
            return;
      }

      /* we have 14 byte ethernet header (ip header follows);
       * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
       */
      if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
            //printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n", dev->name);
            stats->rx_dropped++;
            return;
      }
      skb_reserve(skb, 2);    /* longword align L3 header */
      skb->dev = dev;

      /* copy L3 payload */
      eth = (u8 *) skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
      memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);

      /* create ethernet header: */
      eth[0]=pkt[0x0b];
      eth[1]=pkt[0x0a];
      eth[2]=pkt[0x09];
      eth[3]=pkt[0x08];
      eth[4]=pkt[0x04];
      eth[5]=pkt[0x03];

      eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;

      if (snap) {
            eth[12] = pkt[18];
            eth[13] = pkt[19];
      } else {
            /* protocol numbers are from rfc-1700 or
             * http://www.iana.org/assignments/ethernet-numbers
             */
            if (pkt[12] >> 4 == 6) { /* version field from IP header */
                  eth[12] = 0x86;   /* IPv6 */
                  eth[13] = 0xdd;
            } else {
                  eth[12] = 0x08;   /* IPv4 */
                  eth[13] = 0x00;
            }
      }

      skb->protocol = dvb_net_eth_type_trans(skb, dev);

      stats->rx_packets++;
      stats->rx_bytes+=skb->len;
      netif_rx(skb);
}

static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
             const u8 *buffer2, size_t buffer2_len,
             struct dmx_section_filter *filter,
             enum dmx_success success)
{
      struct net_device *dev = filter->priv;

      /**
       * we rely on the DVB API definition where exactly one complete
       * section is delivered in buffer1
       */
      dvb_net_sec (dev, buffer1, buffer1_len);
      return 0;
}

static int dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
{
      dev_kfree_skb(skb);
      return 0;
}

static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};

static int dvb_net_filter_sec_set(struct net_device *dev,
               struct dmx_section_filter **secfilter,
               u8 *mac, u8 *mac_mask)
{
      struct dvb_net_priv *priv = dev->priv;
      int ret;

      *secfilter=NULL;
      ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
      if (ret<0) {
            printk("%s: could not get filter\n", dev->name);
            return ret;
      }

      (*secfilter)->priv=(void *) dev;

      memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
      memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
      memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);

      (*secfilter)->filter_value[0]=0x3e;
      (*secfilter)->filter_value[3]=mac[5];
      (*secfilter)->filter_value[4]=mac[4];
      (*secfilter)->filter_value[8]=mac[3];
      (*secfilter)->filter_value[9]=mac[2];
      (*secfilter)->filter_value[10]=mac[1];
      (*secfilter)->filter_value[11]=mac[0];

      (*secfilter)->filter_mask[0] = 0xff;
      (*secfilter)->filter_mask[3] = mac_mask[5];
      (*secfilter)->filter_mask[4] = mac_mask[4];
      (*secfilter)->filter_mask[8] = mac_mask[3];
      (*secfilter)->filter_mask[9] = mac_mask[2];
      (*secfilter)->filter_mask[10] = mac_mask[1];
      (*secfilter)->filter_mask[11]=mac_mask[0];

      dprintk("%s: filter mac=%02x %02x %02x %02x %02x %02x\n",
             dev->name, mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
      dprintk("%s: filter mask=%02x %02x %02x %02x %02x %02x\n",
             dev->name, mac_mask[0], mac_mask[1], mac_mask[2],
             mac_mask[3], mac_mask[4], mac_mask[5]);

      return 0;
}

static int dvb_net_feed_start(struct net_device *dev)
{
      int ret = 0, i;
      struct dvb_net_priv *priv = dev->priv;
      struct dmx_demux *demux = priv->demux;
      unsigned char *mac = (unsigned char *) dev->dev_addr;

      dprintk("%s: rx_mode %i\n", __FUNCTION__, priv->rx_mode);
      mutex_lock(&priv->mutex);
      if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
            printk("%s: BUG %d\n", __FUNCTION__, __LINE__);

      priv->secfeed=NULL;
      priv->secfilter=NULL;
      priv->tsfeed = NULL;

      if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
            dprintk("%s: alloc secfeed\n", __FUNCTION__);
            ret=demux->allocate_section_feed(demux, &priv->secfeed,
                               dvb_net_sec_callback);
            if (ret<0) {
                  printk("%s: could not allocate section feed\n", dev->name);
                  goto error;
            }

            ret = priv->secfeed->set(priv->secfeed, priv->pid, 32768, 1);

            if (ret<0) {
                  printk("%s: could not set section feed\n", dev->name);
                  priv->demux->release_section_feed(priv->demux, priv->secfeed);
                  priv->secfeed=NULL;
                  goto error;
            }

            if (priv->rx_mode != RX_MODE_PROMISC) {
                  dprintk("%s: set secfilter\n", __FUNCTION__);
                  dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
            }

            switch (priv->rx_mode) {
            case RX_MODE_MULTI:
                  for (i = 0; i < priv->multi_num; i++) {
                        dprintk("%s: set multi_secfilter[%d]\n", __FUNCTION__, i);
                        dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
                                           priv->multi_macs[i], mask_normal);
                  }
                  break;
            case RX_MODE_ALL_MULTI:
                  priv->multi_num=1;
                  dprintk("%s: set multi_secfilter[0]\n", __FUNCTION__);
                  dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
                                     mac_allmulti, mask_allmulti);
                  break;
            case RX_MODE_PROMISC:
                  priv->multi_num=0;
                  dprintk("%s: set secfilter\n", __FUNCTION__);
                  dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
                  break;
            }

            dprintk("%s: start filtering\n", __FUNCTION__);
            priv->secfeed->start_filtering(priv->secfeed);
      } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
            struct timespec timeout = { 0, 10000000 }; // 10 msec

            /* we have payloads encapsulated in TS */
            dprintk("%s: alloc tsfeed\n", __FUNCTION__);
            ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
            if (ret < 0) {
                  printk("%s: could not allocate ts feed\n", dev->name);
                  goto error;
            }

            /* Set netdevice pointer for ts decaps callback. */
            priv->tsfeed->priv = (void *)dev;
            ret = priv->tsfeed->set(priv->tsfeed,
                              priv->pid, /* pid */
                              TS_PACKET, /* type */
                              DMX_TS_PES_OTHER, /* pes type */
                              32768,     /* circular buffer size */
                              timeout    /* timeout */
                              );

            if (ret < 0) {
                  printk("%s: could not set ts feed\n", dev->name);
                  priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
                  priv->tsfeed = NULL;
                  goto error;
            }

            dprintk("%s: start filtering\n", __FUNCTION__);
            priv->tsfeed->start_filtering(priv->tsfeed);
      } else
            ret = -EINVAL;

error:
      mutex_unlock(&priv->mutex);
      return ret;
}

static int dvb_net_feed_stop(struct net_device *dev)
{
      struct dvb_net_priv *priv = dev->priv;
      int i, ret = 0;

      dprintk("%s\n", __FUNCTION__);
      mutex_lock(&priv->mutex);
      if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
            if (priv->secfeed) {
                  if (priv->secfeed->is_filtering) {
                        dprintk("%s: stop secfeed\n", __FUNCTION__);
                        priv->secfeed->stop_filtering(priv->secfeed);
                  }

                  if (priv->secfilter) {
                        dprintk("%s: release secfilter\n", __FUNCTION__);
                        priv->secfeed->release_filter(priv->secfeed,
                                                priv->secfilter);
                        priv->secfilter=NULL;
                  }

                  for (i=0; i<priv->multi_num; i++) {
                        if (priv->multi_secfilter[i]) {
                              dprintk("%s: release multi_filter[%d]\n",
                                    __FUNCTION__, i);
                              priv->secfeed->release_filter(priv->secfeed,
                                                      priv->multi_secfilter[i]);
                              priv->multi_secfilter[i] = NULL;
                        }
                  }

                  priv->demux->release_section_feed(priv->demux, priv->secfeed);
                  priv->secfeed = NULL;
            } else
                  printk("%s: no feed to stop\n", dev->name);
      } else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
            if (priv->tsfeed) {
                  if (priv->tsfeed->is_filtering) {
                        dprintk("%s: stop tsfeed\n", __FUNCTION__);
                        priv->tsfeed->stop_filtering(priv->tsfeed);
                  }
                  priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
                  priv->tsfeed = NULL;
            }
            else
                  printk("%s: no ts feed to stop\n", dev->name);
      } else
            ret = -EINVAL;
      mutex_unlock(&priv->mutex);
      return ret;
}


static int dvb_set_mc_filter (struct net_device *dev, struct dev_mc_list *mc)
{
      struct dvb_net_priv *priv = dev->priv;

      if (priv->multi_num == DVB_NET_MULTICAST_MAX)
            return -ENOMEM;

      memcpy(priv->multi_macs[priv->multi_num], mc->dmi_addr, 6);

      priv->multi_num++;
      return 0;
}


static void wq_set_multicast_list (struct work_struct *work)
{
      struct dvb_net_priv *priv =
            container_of(work, struct dvb_net_priv, set_multicast_list_wq);
      struct net_device *dev = priv->net;

      dvb_net_feed_stop(dev);
      priv->rx_mode = RX_MODE_UNI;
      netif_tx_lock_bh(dev);

      if (dev->flags & IFF_PROMISC) {
            dprintk("%s: promiscuous mode\n", dev->name);
            priv->rx_mode = RX_MODE_PROMISC;
      } else if ((dev->flags & IFF_ALLMULTI)) {
            dprintk("%s: allmulti mode\n", dev->name);
            priv->rx_mode = RX_MODE_ALL_MULTI;
      } else if (dev->mc_count) {
            int mci;
            struct dev_mc_list *mc;

            dprintk("%s: set_mc_list, %d entries\n",
                  dev->name, dev->mc_count);

            priv->rx_mode = RX_MODE_MULTI;
            priv->multi_num = 0;

            for (mci = 0, mc=dev->mc_list;
                 mci < dev->mc_count;
                 mc = mc->next, mci++) {
                  dvb_set_mc_filter(dev, mc);
            }
      }

      netif_tx_unlock_bh(dev);
      dvb_net_feed_start(dev);
}


static void dvb_net_set_multicast_list (struct net_device *dev)
{
      struct dvb_net_priv *priv = dev->priv;
      schedule_work(&priv->set_multicast_list_wq);
}


static void wq_restart_net_feed (struct work_struct *work)
{
      struct dvb_net_priv *priv =
            container_of(work, struct dvb_net_priv, restart_net_feed_wq);
      struct net_device *dev = priv->net;

      if (netif_running(dev)) {
            dvb_net_feed_stop(dev);
            dvb_net_feed_start(dev);
      }
}


static int dvb_net_set_mac (struct net_device *dev, void *p)
{
      struct dvb_net_priv *priv = dev->priv;
      struct sockaddr *addr=p;

      memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);

      if (netif_running(dev))
            schedule_work(&priv->restart_net_feed_wq);

      return 0;
}


static int dvb_net_open(struct net_device *dev)
{
      struct dvb_net_priv *priv = dev->priv;

      priv->in_use++;
      dvb_net_feed_start(dev);
      return 0;
}


static int dvb_net_stop(struct net_device *dev)
{
      struct dvb_net_priv *priv = dev->priv;

      priv->in_use--;
      return dvb_net_feed_stop(dev);
}

static struct net_device_stats * dvb_net_get_stats(struct net_device *dev)
{
      return &((struct dvb_net_priv*) dev->priv)->stats;
}

static const struct header_ops dvb_header_ops = {
      .create           = eth_header,
      .parse            = eth_header_parse,
      .rebuild    = eth_rebuild_header,
};

static void dvb_net_setup(struct net_device *dev)
{
      ether_setup(dev);

      dev->header_ops         = &dvb_header_ops;
      dev->open         = dvb_net_open;
      dev->stop         = dvb_net_stop;
      dev->hard_start_xmit    = dvb_net_tx;
      dev->get_stats          = dvb_net_get_stats;
      dev->set_multicast_list = dvb_net_set_multicast_list;
      dev->set_mac_address    = dvb_net_set_mac;
      dev->mtu          = 4096;
      dev->mc_count           = 0;

      dev->flags |= IFF_NOARP;
}

static int get_if(struct dvb_net *dvbnet)
{
      int i;

      for (i=0; i<DVB_NET_DEVICES_MAX; i++)
            if (!dvbnet->state[i])
                  break;

      if (i == DVB_NET_DEVICES_MAX)
            return -1;

      dvbnet->state[i]=1;
      return i;
}

static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
{
      struct net_device *net;
      struct dvb_net_priv *priv;
      int result;
      int if_num;

      if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
            return -EINVAL;
      if ((if_num = get_if(dvbnet)) < 0)
            return -EINVAL;

      net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb", dvb_net_setup);
      if (!net)
            return -ENOMEM;

      if (dvbnet->dvbdev->id)
            snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
                   dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
      else
            /* compatibility fix to keep dvb0_0 format */
            snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
                   dvbnet->dvbdev->adapter->num, if_num);

      net->addr_len = 6;
      memcpy(net->dev_addr, dvbnet->dvbdev->adapter->proposed_mac, 6);

      dvbnet->device[if_num] = net;

      priv = net->priv;
      priv->net = net;
      priv->demux = dvbnet->demux;
      priv->pid = pid;
      priv->rx_mode = RX_MODE_UNI;
      priv->need_pusi = 1;
      priv->tscc = 0;
      priv->feedtype = feedtype;
      reset_ule(priv);

      INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
      INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
      mutex_init(&priv->mutex);

      net->base_addr = pid;

      if ((result = register_netdev(net)) < 0) {
            dvbnet->device[if_num] = NULL;
            free_netdev(net);
            return result;
      }
      printk("dvb_net: created network interface %s\n", net->name);

      return if_num;
}

static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
{
      struct net_device *net = dvbnet->device[num];
      struct dvb_net_priv *priv;

      if (!dvbnet->state[num])
            return -EINVAL;
      priv = net->priv;
      if (priv->in_use)
            return -EBUSY;

      dvb_net_stop(net);
      flush_scheduled_work();
      printk("dvb_net: removed network interface %s\n", net->name);
      unregister_netdev(net);
      dvbnet->state[num]=0;
      dvbnet->device[num] = NULL;
      free_netdev(net);

      return 0;
}

static int dvb_net_do_ioctl(struct inode *inode, struct file *file,
              unsigned int cmd, void *parg)
{
      struct dvb_device *dvbdev = file->private_data;
      struct dvb_net *dvbnet = dvbdev->priv;

      if (((file->f_flags&O_ACCMODE)==O_RDONLY))
            return -EPERM;

      switch (cmd) {
      case NET_ADD_IF:
      {
            struct dvb_net_if *dvbnetif = parg;
            int result;

            if (!capable(CAP_SYS_ADMIN))
                  return -EPERM;

            if (!try_module_get(dvbdev->adapter->module))
                  return -EPERM;

            result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
            if (result<0) {
                  module_put(dvbdev->adapter->module);
                  return result;
            }
            dvbnetif->if_num=result;
            break;
      }
      case NET_GET_IF:
      {
            struct net_device *netdev;
            struct dvb_net_priv *priv_data;
            struct dvb_net_if *dvbnetif = parg;

            if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
                !dvbnet->state[dvbnetif->if_num])
                  return -EINVAL;

            netdev = dvbnet->device[dvbnetif->if_num];

            priv_data = netdev->priv;
            dvbnetif->pid=priv_data->pid;
            dvbnetif->feedtype=priv_data->feedtype;
            break;
      }
      case NET_REMOVE_IF:
      {
            int ret;

            if (!capable(CAP_SYS_ADMIN))
                  return -EPERM;
            if ((unsigned long) parg >= DVB_NET_DEVICES_MAX)
                  return -EINVAL;
            ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
            if (!ret)
                  module_put(dvbdev->adapter->module);
            return ret;
      }

      /* binary compatiblity cruft */
      case __NET_ADD_IF_OLD:
      {
            struct __dvb_net_if_old *dvbnetif = parg;
            int result;

            if (!capable(CAP_SYS_ADMIN))
                  return -EPERM;

            if (!try_module_get(dvbdev->adapter->module))
                  return -EPERM;

            result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
            if (result<0) {
                  module_put(dvbdev->adapter->module);
                  return result;
            }
            dvbnetif->if_num=result;
            break;
      }
      case __NET_GET_IF_OLD:
      {
            struct net_device *netdev;
            struct dvb_net_priv *priv_data;
            struct __dvb_net_if_old *dvbnetif = parg;

            if (dvbnetif->if_num >= DVB_NET_DEVICES_MAX ||
                !dvbnet->state[dvbnetif->if_num])
                  return -EINVAL;

            netdev = dvbnet->device[dvbnetif->if_num];

            priv_data = netdev->priv;
            dvbnetif->pid=priv_data->pid;
            break;
      }
      default:
            return -ENOTTY;
      }
      return 0;
}

static int dvb_net_ioctl(struct inode *inode, struct file *file,
            unsigned int cmd, unsigned long arg)
{
      return dvb_usercopy(inode, file, cmd, arg, dvb_net_do_ioctl);
}

static int dvb_net_close(struct inode *inode, struct file *file)
{
      struct dvb_device *dvbdev = file->private_data;
      struct dvb_net *dvbnet = dvbdev->priv;

      dvb_generic_release(inode, file);

      if(dvbdev->users == 1 && dvbnet->exit == 1) {
            fops_put(file->f_op);
            file->f_op = NULL;
            wake_up(&dvbdev->wait_queue);
      }
      return 0;
}


static struct file_operations dvb_net_fops = {
      .owner = THIS_MODULE,
      .ioctl = dvb_net_ioctl,
      .open =     dvb_generic_open,
      .release = dvb_net_close,
};

static struct dvb_device dvbdev_net = {
      .priv = NULL,
      .users = 1,
      .writers = 1,
      .fops = &dvb_net_fops,
};


void dvb_net_release (struct dvb_net *dvbnet)
{
      int i;

      dvbnet->exit = 1;
      if (dvbnet->dvbdev->users < 1)
            wait_event(dvbnet->dvbdev->wait_queue,
                        dvbnet->dvbdev->users==1);

      dvb_unregister_device(dvbnet->dvbdev);

      for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
            if (!dvbnet->state[i])
                  continue;
            dvb_net_remove_if(dvbnet, i);
      }
}
EXPORT_SYMBOL(dvb_net_release);


int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
              struct dmx_demux *dmx)
{
      int i;

      dvbnet->demux = dmx;

      for (i=0; i<DVB_NET_DEVICES_MAX; i++)
            dvbnet->state[i] = 0;

      dvb_register_device (adap, &dvbnet->dvbdev, &dvbdev_net,
                       dvbnet, DVB_DEVICE_NET);

      return 0;
}
EXPORT_SYMBOL(dvb_net_init);

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