[linux-dvb] [Patch] Error in dvb_net.c on 64bit platforms

Michael Krufky mkrufky at m1k.net
Tue Nov 1 13:43:29 CET 2005


Ralph Metzler wrote:

>Holger Kiehl writes:
> > On Mon, 31 Oct 2005, Holger Kiehl wrote:
> > 
> > > Hello
> > > 
> > > Removing several dvb net interfaces as follows:
> > > 
> > >       /sbin/ifconfig dvb0_4 down
> > >       /sbin/ifconfig dvb0_3 down
> > >       /sbin/ifconfig dvb0_2 down
> > >       /sbin/ifconfig dvb0_1 down
> > >       /sbin/ifconfig dvb0_0 down
> > > 
> > > Always produces an oops on a 64 bit system. On a 32 bit system this is no
> > > problem. Applying the attached patch makes it work on 64 bit systems.
> > > 
> > After booting the system I still get the oops:
> > 
> > Oct 31 14:51:43 sojus kernel: dvb_demux_feed_del: feed not in list (type=1 
> > state=0 pid=ffff)
> > Oct 31 14:51:43 sojus kernel: Unable to handle kernel paging request at 
> > 00000000000010f8 RIP:
> > Oct 31 14:51:43 sojus kernel: <ffffffff8028dde0>{dvb_net_filter_sec_set+48}
> > Oct 31 14:51:43 sojus kernel: PGD cce6a067 PUD 0
> > Oct 31 14:51:43 sojus kernel: Oops: 0000 [1] SMP
> > Oct 31 14:51:43 sojus kernel: CPU 1
>
>
>There are some race conditions in the networking code which only 
>show up on SMP. 
>Please try the file below. It adds a mutex around the filter handling
>code. I did not test this myself (lacking an SMP system for testing).
>I did this blindly based on another bug report but did not hear back
>from that person if this suffices to remove the race. So, if you or
>anybody else with SMP can test it that would be great. 
>
>The could of course be something else showing up onl on 64 bit.
>Does this ooops also happen on 32 bit SMP?
>
>Ralph
>  
>
Ralph-

Did you intend on having this committed?  If so, please generate a 
patch, containing a sign-off and short description.  We only have until 
next week if we want to get patches into kernel 2.6.15.

Thanks,

Michael Krufky

>
>/*
> * dvb_net.c
> *
> * Copyright (C) 2001 Convergence integrated media GmbH
> *                    Ralph Metzler <ralph at convergence.de>
> * Copyright (C) 2002 Ralph Metzler <rjkm at 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 at cosy.sbg.ac.at>
> *                      and Wolfram Stering <wstering at cosy.sbg.ac.at>
> *
> * ULE Decaps according to draft-ietf-ipdvb-ule-03.txt.
> *
> * 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.
> */
>
>/*
> * FIXME / TODO (dvb_net.c):
> *
> * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
> *
> * TS_FEED callback is called once for every single TS cell although it is
> * registered (in dvb_net_feed_start()) for 100 TS cells (used for dvb_net_ule()).
> *
> */
>
>#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/version.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 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 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 semaphore mutex;
>	spinlock_t lock;
>};
>
>
>/**
> *	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 at 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->mac.raw=skb->data;
>	skb_pull(skb,dev->hard_header_len);
>#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,8)
>	eth = skb->mac.ethernet;
>#else
>	eth = eth_hdr(skb);
>#endif
>
>	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
>
>static int ule_test_sndu( struct dvb_net_priv *p )
>{
>	return -1;
>}
>
>static int ule_bridged_sndu( struct dvb_net_priv *p )
>{
>	/* BRIDGE SNDU handling sucks in draft-ietf-ipdvb-ule-03.txt.
>	 * This has to be the last extension header, otherwise it won't work.
>	 * Blame the authors!
>	 */
>	p->ule_bridged = 1;
>	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 ) = { 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 );
>			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
>			ext_len = -1;	/* SNDU has to be discarded. */
>	} else {
>		/* Optional extension header.  Calculate the length. */
>		ext_len = hlen << 2;
>		/* 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 );
>		p->ule_next_hdr += 2;
>	}
>
>	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 == -1) return -1;	/* Stop extension header processing and discard SNDU. */
>		total_ext_len += l;
>
>	} 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;
>	u8 *ts, *ts_end, *from_where = NULL, 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
>
>	if (dev == NULL) {
>		printk( KERN_ERR "NO netdev struct!\n" );
>		return;
>	}
>
>	/* For all TS cells in current buffer.
>	 * Appearently, we are called for every single TS cell.
>	 */
>	for (ts = (char *)buf, ts_end = (char *)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. */
>					((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 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;
>			}
>		}
>
>		/* Check continuity counter. */
>		if (new_ts) {
>			if ((ts[3] & 0x0F) == priv->tscc)
>				priv->tscc = (priv->tscc + 1) & 0x0F;
>			else {
>				/* TS discontinuity handling: */
>				printk(KERN_WARNING "%lu: TS discontinuity: got %#x, "
>				       "exptected %#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.
>					((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
>					((struct dvb_net_priv *) dev->priv)->stats.rx_frame_errors++;
>				}
>				reset_ule(priv);
>				/* skip to next PUSI. */
>				priv->need_pusi = 1;
>				ts += TS_SZ;
>				priv->ts_count++;
>				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 > 181) {
>						/* 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;
>						ts += TS_SZ;
>						priv->ts_count++;
>						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. */
>					((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
>					((struct dvb_net_priv *) dev->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 > 32763) {
>					printk(KERN_WARNING "%lu: Invalid ULE SNDU length %u. "
>					       "Resyncing.\n", priv->ts_count, priv->ule_sndu_len);
>					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);
>			struct kvec iov[3] = {
>				{ &ulen, sizeof ulen },
>				{ &utype, sizeof utype },
>				{ priv->ule_skb->data, priv->ule_skb->len - 4 }
>			};
>			unsigned long 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);
>			expected_crc = *((u8 *)priv->ule_skb->tail - 4) << 24 |
>				       *((u8 *)priv->ule_skb->tail - 3) << 16 |
>				       *((u8 *)priv->ule_skb->tail - 2) << 8 |
>				       *((u8 *)priv->ule_skb->tail - 1);
>			if (ule_crc != expected_crc) {
>				printk(KERN_WARNING "%lu: CRC32 check FAILED: %#lx / %#lx, 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
>
>				((struct dvb_net_priv *) dev->priv)->stats.rx_errors++;
>				((struct dvb_net_priv *) dev->priv)->stats.rx_crc_errors++;
>				dev_kfree_skb(priv->ule_skb);
>			} else {
>				/* CRC32 verified OK. */
>				/* 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 );
>				}
>
>				/* CRC32 was OK. Remove it from skb. */
>				priv->ule_skb->tail -= 4;
>				priv->ule_skb->len -= 4;
>
>				/* Filter on receiver's destination MAC address, if present. */
>				if (!priv->ule_dbit) {
>					/* The destination MAC address is the next data in the skb. */
>					if (memcmp( priv->ule_skb->data, dev->dev_addr, ETH_ALEN )) {
>						/* MAC addresses don't match.  Drop SNDU. */
>						// printk( KERN_WARNING "Dropping SNDU, MAC address.\n" );
>						dev_kfree_skb( priv->ule_skb );
>						goto sndu_done;
>					}
>					if (! priv->ule_bridged) {
>						skb_push( priv->ule_skb, ETH_ALEN + 2 );
>						ethh = (struct ethhdr *)priv->ule_skb->data;
>						memcpy( ethh->h_dest, ethh->h_source, ETH_ALEN );
>						memset( ethh->h_source, 0, ETH_ALEN );
>						ethh->h_proto = htons( priv->ule_sndu_type );
>					} else {
>						/* Skip the Receiver destination MAC address. */
>						skb_pull( priv->ule_skb, ETH_ALEN );
>					}
>				} else {
>					if (! priv->ule_bridged) {
>						skb_push( priv->ule_skb, ETH_HLEN );
>						ethh = (struct ethhdr *)priv->ule_skb->data;
>						memcpy( ethh->h_dest, dev->dev_addr, ETH_ALEN );
>						memset( ethh->h_source, 0, ETH_ALEN );
>						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; */
>				((struct dvb_net_priv *) dev->priv)->stats.rx_packets++;
>				((struct dvb_net_priv *) dev->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, 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, (u8*) 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);
>        down(&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, 30000000 }; // 30 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,
>					TS_PACKET, DMX_TS_PES_OTHER,
>					32768,     /* circular buffer size */
>					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:
>        up(&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__);
>        down(&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;
>        up(&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 (void *data)
>{
>	struct net_device *dev = data;
>	struct dvb_net_priv *priv = dev->priv;
>
>
>	dvb_net_feed_stop(dev);
>
>	priv->rx_mode = RX_MODE_UNI;
>
>	spin_lock_bh(&dev->xmit_lock);
>	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);
>		}
>	}
>	spin_unlock_bh(&dev->xmit_lock);
>	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 (void *data)
>{
>	struct net_device *dev = data;
>
>	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 void dvb_net_setup(struct net_device *dev)
>{
>	ether_setup(dev);
>
>	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->hard_header_cache  = NULL;
>	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->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, net);
>	INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed, net);
>        sema_init(&priv->mutex, 1);
>	spin_lock_init(&priv->lock);
>
>	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 int 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 int) parg >= DVB_NET_DEVICES_MAX)
>			return -EINVAL;
>		ret = dvb_net_remove_if(dvbnet, (unsigned int) 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 struct file_operations dvb_net_fops = {
>	.owner = THIS_MODULE,
>	.ioctl = dvb_net_ioctl,
>	.open =	dvb_generic_open,
>	.release = dvb_generic_release,
>};
>
>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;
>
>	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);
>
>
>_______________________________________________
>linux-dvb mailing list
>linux-dvb at linuxtv.org
>http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
>  
>




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