/*
   * 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 <linux/sched.h>
  
  #include "dvb_demux.h"
  #include "dvb_net.h"
  
  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
  
  static void hexdump(const unsigned char *buf, unsigned short len)
  {
  	print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  }
  
  #endif
  
  struct dvb_net_priv {
  	int in_use;
  	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 __be16 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(ether_addr_equal(eth->h_dest,dev->broadcast))
  			skb->pkt_type=PACKET_BROADCAST;
  		else
  			skb->pkt_type=PACKET_MULTICAST;
  	}
  
  	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
  		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) < ETH_P_802_3_MIN) {
  		int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
  		/* A frame Type < ETH_P_802_3_MIN 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(*(__be16 *)p->ule_next_hdr);
  					p->ule_next_hdr += 2;
  				} else {
  					p->ule_sndu_type = ntohs(*(__be16 *)(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( *(__be16 *)(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
  		pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i
  ",
  			 p->ule_next_hdr, (int)p->ule_sndu_type,
  			 l, total_ext_len);
  #endif
  
  	} while (p->ule_sndu_type < ETH_P_802_3_MIN);
  
  	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 = netdev_priv(dev);
  	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;
  	bool error = false;
  
  #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;
  #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.
  ",
  				       priv->ts_count, ts[0],
  				       (ts[1] & TS_TEI) >> 7,
  				       (ts[3] & TS_SC) >> 6);
  
  				/* Drop partly decoded SNDU, reset state, resync on PUSI. */
  				if (priv->ule_skb) {
  					dev_kfree_skb( priv->ule_skb );
  					/* Prepare for next SNDU. */
  					dev->stats.rx_errors++;
  					dev->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)
  ", 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.
  ", 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.
  					dev->stats.rx_errors++;
  					dev->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.
  ", priv->ts_count, *from_where);
  
  						/* Drop partly decoded SNDU, reset state, resync on PUSI. */
  						if (priv->ule_skb) {
  							error = true;
  							dev_kfree_skb(priv->ule_skb);
  						}
  
  						if (error || priv->ule_sndu_remain) {
  							dev->stats.rx_errors++;
  							dev->stats.rx_frame_errors++;
  							error = false;
  						}
  
  						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. */
  					dev->stats.rx_errors++;
  					dev->stats.rx_length_errors++;
  					printk(KERN_WARNING "%lu: Expected %d more SNDU bytes, but "
  					       "got PUSI (pf %d, ts_remain %d).  Flushing incomplete payload.
  ",
  					       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.
  ", ts_remain);
  				priv->ule_sndu_len = 0;
  				priv->need_pusi = 1;
  				ts += TS_SZ;
  				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.
  ", priv->ts_count, priv->ule_sndu_len);
  					dev->stats.rx_errors++;
  					dev->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;
  			}
  
  			priv->ule_sndu_remain = priv->ule_sndu_len + 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_remain--;
  					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_1 = 0;
  						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.
  ",
  				       dev->name);
  				dev->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. */
  			__be16 ulen = htons(priv->ule_sndu_len);
  			__be16 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 |= htons(0x8000);
  			}
  
  			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.
  ",
  				       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
  
  				dev->stats.rx_errors++;
  				dev->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 (!ether_addr_equal(priv->ule_skb->data, bc_addr)) {
  								/* multicast */
  								if (priv->rx_mode == RX_MODE_MULTI) {
  									int i;
  									for(i = 0; i < priv->multi_num &&
  									    !ether_addr_equal(priv->ule_skb->data,
  											      priv->multi_macs[i]); 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 (!ether_addr_equal(priv->ule_skb->data, dev->dev_addr))
  							drop = 1;
  						/* else: destination address matches the MAC address of our receiver device */
  					}
  					/* else: promiscuous mode; pass everything up the stack */
  
  					if (drop) {
  #ifdef ULE_DEBUG
  						netdev_dbg(dev, "Dropping SNDU: MAC destination address does not match: dest addr: %pM, dev addr: %pM
  ",
  							   priv->ule_skb->data, 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 < ETH_P_802_3_MIN) {
  					/* 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.
  " );
  						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);
  						eth_zero_addr(ethh->h_source);
  					}
  					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; */
  				dev->stats.rx_packets++;
  				dev->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]
  ",
  			//	*(from_where + 0), *(from_where + 1),
  			//	*(from_where + 2), *(from_where + 3));
  			// printk(KERN_WARNING "ts @ %p, stopped @ %p:
  ", 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)
  {
  	struct net_device *dev = feed->priv;
  
  	if (buffer2)
  		printk(KERN_WARNING "buffer2 not NULL: %p.
  ", buffer2);
  	if (buffer1_len > 32768)
  		printk(KERN_WARNING "length > 32k: %zu.
  ", buffer1_len);
  	/* printk("TS callback: %u bytes, %u TS cells @ %p.
  ",
  		  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 = &dev->stats;
  	int snap = 0;
  
  	/* note: pkt_len includes a 32bit checksum */
  	if (pkt_len < 16) {
  		printk("%s: IP/MPE packet length = %d too small.
  ",
  			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.
  ", 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)
  {
  	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 NETDEV_TX_OK;
  }
  
  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 = netdev_priv(dev);
  	int ret;
  
  	*secfilter=NULL;
  	ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
  	if (ret<0) {
  		printk("%s: could not get filter
  ", 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];
  
  	netdev_dbg(dev, "filter mac=%pM mask=%pM
  ", mac, mac_mask);
  
  	return 0;
  }
  
  static int dvb_net_feed_start(struct net_device *dev)
  {
  	int ret = 0, i;
  	struct dvb_net_priv *priv = netdev_priv(dev);
  	struct dmx_demux *demux = priv->demux;
  	unsigned char *mac = (unsigned char *) dev->dev_addr;
  
  	netdev_dbg(dev, "rx_mode %i
  ", priv->rx_mode);
  	mutex_lock(&priv->mutex);
  	if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
  		printk("%s: BUG %d
  ", __func__, __LINE__);
  
  	priv->secfeed=NULL;
  	priv->secfilter=NULL;
  	priv->tsfeed = NULL;
  
  	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
  		netdev_dbg(dev, "alloc secfeed
  ");
  		ret=demux->allocate_section_feed(demux, &priv->secfeed,
  					 dvb_net_sec_callback);
  		if (ret<0) {
  			printk("%s: could not allocate section feed
  ", dev->name);
  			goto error;
  		}
  
  		ret = priv->secfeed->set(priv->secfeed, priv->pid, 32768, 1);
  
  		if (ret<0) {
  			printk("%s: could not set section feed
  ", dev->name);
  			priv->demux->release_section_feed(priv->demux, priv->secfeed);
  			priv->secfeed=NULL;
  			goto error;
  		}
  
  		if (priv->rx_mode != RX_MODE_PROMISC) {
  			netdev_dbg(dev, "set secfilter
  ");
  			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++) {
  				netdev_dbg(dev, "set multi_secfilter[%d]
  ", 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;
  			netdev_dbg(dev, "set multi_secfilter[0]
  ");
  			dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
  					       mac_allmulti, mask_allmulti);
  			break;
  		case RX_MODE_PROMISC:
  			priv->multi_num=0;
  			netdev_dbg(dev, "set secfilter
  ");
  			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
  			break;
  		}
  
  		netdev_dbg(dev, "start filtering
  ");
  		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 */
  		netdev_dbg(dev, "alloc tsfeed
  ");
  		ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
  		if (ret < 0) {
  			printk("%s: could not allocate ts feed
  ", 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_PES_OTHER, /* pes type */
  					32768,     /* circular buffer size */
  					timeout    /* timeout */
  					);
  
  		if (ret < 0) {
  			printk("%s: could not set ts feed
  ", dev->name);
  			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
  			priv->tsfeed = NULL;
  			goto error;
  		}
  
  		netdev_dbg(dev, "start filtering
  ");
  		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 = netdev_priv(dev);
  	int i, ret = 0;
  
  	mutex_lock(&priv->mutex);
  	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
  		if (priv->secfeed) {
  			if (priv->secfeed->is_filtering) {
  				netdev_dbg(dev, "stop secfeed
  ");
  				priv->secfeed->stop_filtering(priv->secfeed);
  			}
  
  			if (priv->secfilter) {
  				netdev_dbg(dev, "release secfilter
  ");
  				priv->secfeed->release_filter(priv->secfeed,
  							      priv->secfilter);
  				priv->secfilter=NULL;
  			}
  
  			for (i=0; i<priv->multi_num; i++) {
  				if (priv->multi_secfilter[i]) {
  					netdev_dbg(dev, "release multi_filter[%d]
  ",
  						   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
  ", dev->name);
  	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
  		if (priv->tsfeed) {
  			if (priv->tsfeed->is_filtering) {
  				netdev_dbg(dev, "stop tsfeed
  ");
  				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
  ", dev->name);
  	} else
  		ret = -EINVAL;
  	mutex_unlock(&priv->mutex);
  	return ret;
  }
  
  
  static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
  {
  	struct dvb_net_priv *priv = netdev_priv(dev);
  
  	if (priv->multi_num == DVB_NET_MULTICAST_MAX)
  		return -ENOMEM;
  
  	memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
  
  	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_addr_lock_bh(dev);
  
  	if (dev->flags & IFF_PROMISC) {
  		netdev_dbg(dev, "promiscuous mode
  ");
  		priv->rx_mode = RX_MODE_PROMISC;
  	} else if ((dev->flags & IFF_ALLMULTI)) {
  		netdev_dbg(dev, "allmulti mode
  ");
  		priv->rx_mode = RX_MODE_ALL_MULTI;
  	} else if (!netdev_mc_empty(dev)) {
  		struct netdev_hw_addr *ha;
  
  		netdev_dbg(dev, "set_mc_list, %d entries
  ",
  			   netdev_mc_count(dev));
  
  		priv->rx_mode = RX_MODE_MULTI;
  		priv->multi_num = 0;
  
  		netdev_for_each_mc_addr(ha, dev)
  			dvb_set_mc_filter(dev, ha->addr);
  	}
  
  	netif_addr_unlock_bh(dev);
  	dvb_net_feed_start(dev);
  }
  
  
  static void dvb_net_set_multicast_list (struct net_device *dev)
  {
  	struct dvb_net_priv *priv = netdev_priv(dev);
  	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 = netdev_priv(dev);
  	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 = netdev_priv(dev);
  
  	priv->in_use++;
  	dvb_net_feed_start(dev);
  	return 0;
  }
  
  
  static int dvb_net_stop(struct net_device *dev)
  {
  	struct dvb_net_priv *priv = netdev_priv(dev);
  
  	priv->in_use--;
  	return dvb_net_feed_stop(dev);
  }
  
  static const struct header_ops dvb_header_ops = {
  	.create		= eth_header,
  	.parse		= eth_header_parse,
  };
  
  
  static const struct net_device_ops dvb_netdev_ops = {
  	.ndo_open		= dvb_net_open,
  	.ndo_stop		= dvb_net_stop,
  	.ndo_start_xmit		= dvb_net_tx,
  	.ndo_set_rx_mode	= dvb_net_set_multicast_list,
  	.ndo_set_mac_address    = dvb_net_set_mac,
  	.ndo_change_mtu		= eth_change_mtu,
  	.ndo_validate_addr	= eth_validate_addr,
  };
  
  static void dvb_net_setup(struct net_device *dev)
  {
  	ether_setup(dev);
  
  	dev->header_ops		= &dvb_header_ops;
  	dev->netdev_ops		= &dvb_netdev_ops;
  	dev->mtu		= 4096;
  
  	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",
  			   NET_NAME_UNKNOWN, 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 = netdev_priv(net);
  	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
  ", 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 = netdev_priv(net);
  	if (priv->in_use)
  		return -EBUSY;
  
  	dvb_net_stop(net);
  	flush_work(&priv->set_multicast_list_wq);
  	flush_work(&priv->restart_net_feed_wq);
  	printk("dvb_net: removed network interface %s
  ", 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 file *file,
  		  unsigned int cmd, void *parg)
  {
  	struct dvb_device *dvbdev = file->private_data;
  	struct dvb_net *dvbnet = dvbdev->priv;
  	int ret = 0;
  
  	if (((file->f_flags&O_ACCMODE)==O_RDONLY))
  		return -EPERM;
  
  	if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
  		return -ERESTARTSYS;
  
  	switch (cmd) {
  	case NET_ADD_IF:
  	{
  		struct dvb_net_if *dvbnetif = parg;
  		int result;
  
  		if (!capable(CAP_SYS_ADMIN)) {
  			ret = -EPERM;
  			goto ioctl_error;
  		}
  
  		if (!try_module_get(dvbdev->adapter->module)) {
  			ret = -EPERM;
  			goto ioctl_error;
  		}
  
  		result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
  		if (result<0) {
  			module_put(dvbdev->adapter->module);
  			ret = result;
  			goto ioctl_error;
  		}
  		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]) {
  			ret = -EINVAL;
  			goto ioctl_error;
  		}
  
  		netdev = dvbnet->device[dvbnetif->if_num];
  
  		priv_data = netdev_priv(netdev);
  		dvbnetif->pid=priv_data->pid;
  		dvbnetif->feedtype=priv_data->feedtype;
  		break;
  	}
  	case NET_REMOVE_IF:
  	{
  		if (!capable(CAP_SYS_ADMIN)) {
  			ret = -EPERM;
  			goto ioctl_error;
  		}
  		if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
  			ret = -EINVAL;
  			goto ioctl_error;
  		}
  		ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
  		if (!ret)
  			module_put(dvbdev->adapter->module);
  		break;
  	}
  
  	/* binary compatibility cruft */
  	case __NET_ADD_IF_OLD:
  	{
  		struct __dvb_net_if_old *dvbnetif = parg;
  		int result;
  
  		if (!capable(CAP_SYS_ADMIN)) {
  			ret = -EPERM;
  			goto ioctl_error;
  		}
  
  		if (!try_module_get(dvbdev->adapter->module)) {
  			ret = -EPERM;
  			goto ioctl_error;
  		}
  
  		result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
  		if (result<0) {
  			module_put(dvbdev->adapter->module);
  			ret = result;
  			goto ioctl_error;
  		}
  		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]) {
  			ret = -EINVAL;
  			goto ioctl_error;
  		}
  
  		netdev = dvbnet->device[dvbnetif->if_num];
  
  		priv_data = netdev_priv(netdev);
  		dvbnetif->pid=priv_data->pid;
  		break;
  	}
  	default:
  		ret = -ENOTTY;
  		break;
  	}
  
  ioctl_error:
  	mutex_unlock(&dvbnet->ioctl_mutex);
  	return ret;
  }
  
  static long dvb_net_ioctl(struct file *file,
  	      unsigned int cmd, unsigned long arg)
  {
  	return dvb_usercopy(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)
  		wake_up(&dvbdev->wait_queue);
  	return 0;
  }
  
  
  static const struct file_operations dvb_net_fops = {
  	.owner = THIS_MODULE,
  	.unlocked_ioctl = dvb_net_ioctl,
  	.open =	dvb_generic_open,
  	.release = dvb_net_close,
  	.llseek = noop_llseek,
  };
  
  static const struct dvb_device dvbdev_net = {
  	.priv = NULL,
  	.users = 1,
  	.writers = 1,
  #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
  	.name = "dvb-net",
  #endif
  	.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;
  
  	mutex_init(&dvbnet->ioctl_mutex);
  	dvbnet->demux = dmx;
  
  	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
  		dvbnet->state[i] = 0;
  
  	return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
  			     dvbnet, DVB_DEVICE_NET);
  }
  EXPORT_SYMBOL(dvb_net_init);