dvb_net.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * dvb_net.c
   4 *
   5 * Copyright (C) 2001 Convergence integrated media GmbH
   6 *                    Ralph Metzler <ralph@convergence.de>
   7 * Copyright (C) 2002 Ralph Metzler <rjkm@metzlerbros.de>
   8 *
   9 * ULE Decapsulation code:
  10 * Copyright (C) 2003, 2004 gcs - Global Communication & Services GmbH.
  11 *                      and Department of Scientific Computing
  12 *                          Paris Lodron University of Salzburg.
  13 *                          Hilmar Linder <hlinder@cosy.sbg.ac.at>
  14 *                      and Wolfram Stering <wstering@cosy.sbg.ac.at>
  15 *
  16 * ULE Decaps according to RFC 4326.
  17 */
  18
  19/*
  20 * ULE ChangeLog:
  21 * Feb 2004: hl/ws v1: Implementing draft-fair-ipdvb-ule-01.txt
  22 *
  23 * Dec 2004: hl/ws v2: Implementing draft-ietf-ipdvb-ule-03.txt:
  24 *                       ULE Extension header handling.
  25 *                     Bugreports by Moritz Vieth and Hanno Tersteegen,
  26 *                       Fraunhofer Institute for Open Communication Systems
  27 *                       Competence Center for Advanced Satellite Communications.
  28 *                     Bugfixes and robustness improvements.
  29 *                     Filtering on dest MAC addresses, if present (D-Bit = 0)
  30 *                     DVB_ULE_DEBUG compile-time option.
  31 * Apr 2006: cp v3:    Bugfixes and compliency with RFC 4326 (ULE) by
  32 *                       Christian Praehauser <cpraehaus@cosy.sbg.ac.at>,
  33 *                       Paris Lodron University of Salzburg.
  34 */
  35
  36/*
  37 * FIXME / TODO (dvb_net.c):
  38 *
  39 * Unloading does not work for 2.6.9 kernels: a refcount doesn't go to zero.
  40 *
  41 */
  42
  43#define pr_fmt(fmt) "dvb_net: " fmt
  44
  45#include <linux/module.h>
  46#include <linux/kernel.h>
  47#include <linux/netdevice.h>
  48#include <linux/nospec.h>
  49#include <linux/etherdevice.h>
  50#include <linux/dvb/net.h>
  51#include <linux/uio.h>
  52#include <linux/uaccess.h>
  53#include <linux/crc32.h>
  54#include <linux/mutex.h>
  55#include <linux/sched.h>
  56
  57#include <media/dvb_demux.h>
  58#include <media/dvb_net.h>
  59
  60static inline __u32 iov_crc32( __u32 c, struct kvec *iov, unsigned int cnt )
  61{
  62	unsigned int j;
  63	for (j = 0; j < cnt; j++)
  64		c = crc32_be( c, iov[j].iov_base, iov[j].iov_len );
  65	return c;
  66}
  67
  68
  69#define DVB_NET_MULTICAST_MAX 10
  70
  71#ifdef DVB_ULE_DEBUG
  72/*
  73 * The code inside DVB_ULE_DEBUG keeps a history of the
  74 * last 100 TS cells processed.
  75 */
  76static unsigned char ule_hist[100*TS_SZ] = { 0 };
  77static unsigned char *ule_where = ule_hist, ule_dump;
  78
  79static void hexdump(const unsigned char *buf, unsigned short len)
  80{
  81	print_hex_dump_debug("", DUMP_PREFIX_OFFSET, 16, 1, buf, len, true);
  82}
  83#endif
  84
  85struct dvb_net_priv {
  86	int in_use;
  87	u16 pid;
  88	struct net_device *net;
  89	struct dvb_net *host;
  90	struct dmx_demux *demux;
  91	struct dmx_section_feed *secfeed;
  92	struct dmx_section_filter *secfilter;
  93	struct dmx_ts_feed *tsfeed;
  94	int multi_num;
  95	struct dmx_section_filter *multi_secfilter[DVB_NET_MULTICAST_MAX];
  96	unsigned char multi_macs[DVB_NET_MULTICAST_MAX][6];
  97	int rx_mode;
  98#define RX_MODE_UNI 0
  99#define RX_MODE_MULTI 1
 100#define RX_MODE_ALL_MULTI 2
 101#define RX_MODE_PROMISC 3
 102	struct work_struct set_multicast_list_wq;
 103	struct work_struct restart_net_feed_wq;
 104	unsigned char feedtype;			/* Either FEED_TYPE_ or FEED_TYPE_ULE */
 105	int need_pusi;				/* Set to 1, if synchronization on PUSI required. */
 106	unsigned char tscc;			/* TS continuity counter after sync on PUSI. */
 107	struct sk_buff *ule_skb;		/* ULE SNDU decodes into this buffer. */
 108	unsigned char *ule_next_hdr;		/* Pointer into skb to next ULE extension header. */
 109	unsigned short ule_sndu_len;		/* ULE SNDU length in bytes, w/o D-Bit. */
 110	unsigned short ule_sndu_type;		/* ULE SNDU type field, complete. */
 111	unsigned char ule_sndu_type_1;		/* ULE SNDU type field, if split across 2 TS cells. */
 112	unsigned char ule_dbit;			/* Whether the DestMAC address present
 113						 * or not (bit is set). */
 114	unsigned char ule_bridged;		/* Whether the ULE_BRIDGED extension header was found. */
 115	int ule_sndu_remain;			/* Nr. of bytes still required for current ULE SNDU. */
 116	unsigned long ts_count;			/* Current ts cell counter. */
 117	struct mutex mutex;
 118};
 119
 120
 121/*
 122 *	Determine the packet's protocol ID. The rule here is that we
 123 *	assume 802.3 if the type field is short enough to be a length.
 124 *	This is normal practice and works for any 'now in use' protocol.
 125 *
 126 *  stolen from eth.c out of the linux kernel, hacked for dvb-device
 127 *  by Michael Holzt <kju@debian.org>
 128 */
 129static __be16 dvb_net_eth_type_trans(struct sk_buff *skb,
 130				      struct net_device *dev)
 131{
 132	struct ethhdr *eth;
 133	unsigned char *rawp;
 134
 135	skb_reset_mac_header(skb);
 136	skb_pull(skb,dev->hard_header_len);
 137	eth = eth_hdr(skb);
 138
 139	if (*eth->h_dest & 1) {
 140		if(ether_addr_equal(eth->h_dest,dev->broadcast))
 141			skb->pkt_type=PACKET_BROADCAST;
 142		else
 143			skb->pkt_type=PACKET_MULTICAST;
 144	}
 145
 146	if (ntohs(eth->h_proto) >= ETH_P_802_3_MIN)
 147		return eth->h_proto;
 148
 149	rawp = skb->data;
 150
 151	/*
 152	 *	This is a magic hack to spot IPX packets. Older Novell breaks
 153	 *	the protocol design and runs IPX over 802.3 without an 802.2 LLC
 154	 *	layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
 155	 *	won't work for fault tolerant netware but does for the rest.
 156	 */
 157	if (*(unsigned short *)rawp == 0xFFFF)
 158		return htons(ETH_P_802_3);
 159
 160	/*
 161	 *	Real 802.2 LLC
 162	 */
 163	return htons(ETH_P_802_2);
 164}
 165
 166#define TS_SZ	188
 167#define TS_SYNC	0x47
 168#define TS_TEI	0x80
 169#define TS_SC	0xC0
 170#define TS_PUSI	0x40
 171#define TS_AF_A	0x20
 172#define TS_AF_D	0x10
 173
 174/* ULE Extension Header handlers. */
 175
 176#define ULE_TEST	0
 177#define ULE_BRIDGED	1
 178
 179#define ULE_OPTEXTHDR_PADDING 0
 180
 181static int ule_test_sndu( struct dvb_net_priv *p )
 182{
 183	return -1;
 184}
 185
 186static int ule_bridged_sndu( struct dvb_net_priv *p )
 187{
 188	struct ethhdr *hdr = (struct ethhdr*) p->ule_next_hdr;
 189	if(ntohs(hdr->h_proto) < ETH_P_802_3_MIN) {
 190		int framelen = p->ule_sndu_len - ((p->ule_next_hdr+sizeof(struct ethhdr)) - p->ule_skb->data);
 191		/* A frame Type < ETH_P_802_3_MIN for a bridged frame, introduces a LLC Length field. */
 192		if(framelen != ntohs(hdr->h_proto)) {
 193			return -1;
 194		}
 195	}
 196	/* Note:
 197	 * From RFC4326:
 198	 *  "A bridged SNDU is a Mandatory Extension Header of Type 1.
 199	 *   It must be the final (or only) extension header specified in the header chain of a SNDU."
 200	 * The 'ule_bridged' flag will cause the extension header processing loop to terminate.
 201	 */
 202	p->ule_bridged = 1;
 203	return 0;
 204}
 205
 206static int ule_exthdr_padding(struct dvb_net_priv *p)
 207{
 208	return 0;
 209}
 210
 211/*
 212 * Handle ULE extension headers.
 213 *  Function is called after a successful CRC32 verification of an ULE SNDU to complete its decoding.
 214 *  Returns: >= 0: nr. of bytes consumed by next extension header
 215 *	     -1:   Mandatory extension header that is not recognized or TEST SNDU; discard.
 216 */
 217static int handle_one_ule_extension( struct dvb_net_priv *p )
 218{
 219	/* Table of mandatory extension header handlers.  The header type is the index. */
 220	static int (*ule_mandatory_ext_handlers[255])( struct dvb_net_priv *p ) =
 221		{ [0] = ule_test_sndu, [1] = ule_bridged_sndu, [2] = NULL,  };
 222
 223	/* Table of optional extension header handlers.  The header type is the index. */
 224	static int (*ule_optional_ext_handlers[255])( struct dvb_net_priv *p ) =
 225		{ [0] = ule_exthdr_padding, [1] = NULL, };
 226
 227	int ext_len = 0;
 228	unsigned char hlen = (p->ule_sndu_type & 0x0700) >> 8;
 229	unsigned char htype = p->ule_sndu_type & 0x00FF;
 230
 231	if (htype >= ARRAY_SIZE(ule_mandatory_ext_handlers))
 232		return -1;
 233
 234	/* Discriminate mandatory and optional extension headers. */
 235	if (hlen == 0) {
 236		/* Mandatory extension header */
 237		if (ule_mandatory_ext_handlers[htype]) {
 238			ext_len = ule_mandatory_ext_handlers[htype]( p );
 239			if(ext_len >= 0) {
 240				p->ule_next_hdr += ext_len;
 241				if (!p->ule_bridged) {
 242					p->ule_sndu_type = ntohs(*(__be16 *)p->ule_next_hdr);
 243					p->ule_next_hdr += 2;
 244				} else {
 245					p->ule_sndu_type = ntohs(*(__be16 *)(p->ule_next_hdr + ((p->ule_dbit ? 2 : 3) * ETH_ALEN)));
 246					/* This assures the extension handling loop will terminate. */
 247				}
 248			}
 249			// else: extension handler failed or SNDU should be discarded
 250		} else
 251			ext_len = -1;	/* SNDU has to be discarded. */
 252	} else {
 253		/* Optional extension header.  Calculate the length. */
 254		ext_len = hlen << 1;
 255		/* Process the optional extension header according to its type. */
 256		if (ule_optional_ext_handlers[htype])
 257			(void)ule_optional_ext_handlers[htype]( p );
 258		p->ule_next_hdr += ext_len;
 259		p->ule_sndu_type = ntohs( *(__be16 *)(p->ule_next_hdr-2) );
 260		/*
 261		 * note: the length of the next header type is included in the
 262		 * length of THIS optional extension header
 263		 */
 264	}
 265
 266	return ext_len;
 267}
 268
 269static int handle_ule_extensions( struct dvb_net_priv *p )
 270{
 271	int total_ext_len = 0, l;
 272
 273	p->ule_next_hdr = p->ule_skb->data;
 274	do {
 275		l = handle_one_ule_extension( p );
 276		if (l < 0)
 277			return l;	/* Stop extension header processing and discard SNDU. */
 278		total_ext_len += l;
 279		pr_debug("ule_next_hdr=%p, ule_sndu_type=%i, l=%i, total_ext_len=%i\n",
 280			 p->ule_next_hdr, (int)p->ule_sndu_type,
 281			 l, total_ext_len);
 282
 283	} while (p->ule_sndu_type < ETH_P_802_3_MIN);
 284
 285	return total_ext_len;
 286}
 287
 288
 289/* Prepare for a new ULE SNDU: reset the decoder state. */
 290static inline void reset_ule( struct dvb_net_priv *p )
 291{
 292	p->ule_skb = NULL;
 293	p->ule_next_hdr = NULL;
 294	p->ule_sndu_len = 0;
 295	p->ule_sndu_type = 0;
 296	p->ule_sndu_type_1 = 0;
 297	p->ule_sndu_remain = 0;
 298	p->ule_dbit = 0xFF;
 299	p->ule_bridged = 0;
 300}
 301
 302/*
 303 * Decode ULE SNDUs according to draft-ietf-ipdvb-ule-03.txt from a sequence of
 304 * TS cells of a single PID.
 305 */
 306
 307struct dvb_net_ule_handle {
 308	struct net_device *dev;
 309	struct dvb_net_priv *priv;
 310	struct ethhdr *ethh;
 311	const u8 *buf;
 312	size_t buf_len;
 313	unsigned long skipped;
 314	const u8 *ts, *ts_end, *from_where;
 315	u8 ts_remain, how_much, new_ts;
 316	bool error;
 317};
 318
 319static int dvb_net_ule_new_ts_cell(struct dvb_net_ule_handle *h)
 320{
 321	/* We are about to process a new TS cell. */
 322
 323#ifdef DVB_ULE_DEBUG
 324	if (ule_where >= &ule_hist[100*TS_SZ])
 325		ule_where = ule_hist;
 326	memcpy(ule_where, h->ts, TS_SZ);
 327	if (ule_dump) {
 328		hexdump(ule_where, TS_SZ);
 329		ule_dump = 0;
 330	}
 331	ule_where += TS_SZ;
 332#endif
 333
 334	/*
 335	 * Check TS h->error conditions: sync_byte, transport_error_indicator,
 336	 * scrambling_control .
 337	 */
 338	if ((h->ts[0] != TS_SYNC) || (h->ts[1] & TS_TEI) ||
 339	    ((h->ts[3] & TS_SC) != 0)) {
 340		pr_warn("%lu: Invalid TS cell: SYNC %#x, TEI %u, SC %#x.\n",
 341			h->priv->ts_count, h->ts[0],
 342			(h->ts[1] & TS_TEI) >> 7,
 343			(h->ts[3] & TS_SC) >> 6);
 344
 345		/* Drop partly decoded SNDU, reset state, resync on PUSI. */
 346		if (h->priv->ule_skb) {
 347			dev_kfree_skb(h->priv->ule_skb);
 348			/* Prepare for next SNDU. */
 349			h->dev->stats.rx_errors++;
 350			h->dev->stats.rx_frame_errors++;
 351		}
 352		reset_ule(h->priv);
 353		h->priv->need_pusi = 1;
 354
 355		/* Continue with next TS cell. */
 356		h->ts += TS_SZ;
 357		h->priv->ts_count++;
 358		return 1;
 359	}
 360
 361	h->ts_remain = 184;
 362	h->from_where = h->ts + 4;
 363
 364	return 0;
 365}
 366
 367static int dvb_net_ule_ts_pusi(struct dvb_net_ule_handle *h)
 368{
 369	if (h->ts[1] & TS_PUSI) {
 370		/* Find beginning of first ULE SNDU in current TS cell. */
 371		/* Synchronize continuity counter. */
 372		h->priv->tscc = h->ts[3] & 0x0F;
 373		/* There is a pointer field here. */
 374		if (h->ts[4] > h->ts_remain) {
 375			pr_err("%lu: Invalid ULE packet (pointer field %d)\n",
 376				h->priv->ts_count, h->ts[4]);
 377			h->ts += TS_SZ;
 378			h->priv->ts_count++;
 379			return 1;
 380		}
 381		/* Skip to destination of pointer field. */
 382		h->from_where = &h->ts[5] + h->ts[4];
 383		h->ts_remain -= 1 + h->ts[4];
 384		h->skipped = 0;
 385	} else {
 386		h->skipped++;
 387		h->ts += TS_SZ;
 388		h->priv->ts_count++;
 389		return 1;
 390	}
 391
 392	return 0;
 393}
 394
 395static int dvb_net_ule_new_ts(struct dvb_net_ule_handle *h)
 396{
 397	/* Check continuity counter. */
 398	if ((h->ts[3] & 0x0F) == h->priv->tscc)
 399		h->priv->tscc = (h->priv->tscc + 1) & 0x0F;
 400	else {
 401		/* TS discontinuity handling: */
 402		pr_warn("%lu: TS discontinuity: got %#x, expected %#x.\n",
 403			h->priv->ts_count, h->ts[3] & 0x0F,
 404			h->priv->tscc);
 405		/* Drop partly decoded SNDU, reset state, resync on PUSI. */
 406		if (h->priv->ule_skb) {
 407			dev_kfree_skb(h->priv->ule_skb);
 408			/* Prepare for next SNDU. */
 409			// reset_ule(h->priv);  moved to below.
 410			h->dev->stats.rx_errors++;
 411			h->dev->stats.rx_frame_errors++;
 412		}
 413		reset_ule(h->priv);
 414		/* skip to next PUSI. */
 415		h->priv->need_pusi = 1;
 416		return 1;
 417	}
 418	/*
 419	 * If we still have an incomplete payload, but PUSI is
 420	 * set; some TS cells are missing.
 421	 * This is only possible here, if we missed exactly 16 TS
 422	 * cells (continuity counter wrap).
 423	 */
 424	if (h->ts[1] & TS_PUSI) {
 425		if (!h->priv->need_pusi) {
 426			if (!(*h->from_where < (h->ts_remain-1)) ||
 427			    *h->from_where != h->priv->ule_sndu_remain) {
 428				/*
 429				 * Pointer field is invalid.
 430				 * Drop this TS cell and any started ULE SNDU.
 431				 */
 432				pr_warn("%lu: Invalid pointer field: %u.\n",
 433					h->priv->ts_count,
 434					*h->from_where);
 435
 436				/*
 437				 * Drop partly decoded SNDU, reset state,
 438				 * resync on PUSI.
 439				 */
 440				if (h->priv->ule_skb) {
 441					h->error = true;
 442					dev_kfree_skb(h->priv->ule_skb);
 443				}
 444
 445				if (h->error || h->priv->ule_sndu_remain) {
 446					h->dev->stats.rx_errors++;
 447					h->dev->stats.rx_frame_errors++;
 448					h->error = false;
 449				}
 450
 451				reset_ule(h->priv);
 452				h->priv->need_pusi = 1;
 453				return 1;
 454			}
 455			/*
 456			 * Skip pointer field (we're processing a
 457			 * packed payload).
 458			 */
 459			h->from_where += 1;
 460			h->ts_remain -= 1;
 461		} else
 462			h->priv->need_pusi = 0;
 463
 464		if (h->priv->ule_sndu_remain > 183) {
 465			/*
 466			 * Current SNDU lacks more data than there
 467			 * could be available in the current TS cell.
 468			 */
 469			h->dev->stats.rx_errors++;
 470			h->dev->stats.rx_length_errors++;
 471			pr_warn("%lu: Expected %d more SNDU bytes, but got PUSI (pf %d, h->ts_remain %d).  Flushing incomplete payload.\n",
 472				h->priv->ts_count,
 473				h->priv->ule_sndu_remain,
 474				h->ts[4], h->ts_remain);
 475			dev_kfree_skb(h->priv->ule_skb);
 476			/* Prepare for next SNDU. */
 477			reset_ule(h->priv);
 478			/*
 479			 * Resync: go to where pointer field points to:
 480			 * start of next ULE SNDU.
 481			 */
 482			h->from_where += h->ts[4];
 483			h->ts_remain -= h->ts[4];
 484		}
 485	}
 486	return 0;
 487}
 488
 489
 490/*
 491 * Start a new payload with skb.
 492 * Find ULE header.  It is only guaranteed that the
 493 * length field (2 bytes) is contained in the current
 494 * TS.
 495 * Check h.ts_remain has to be >= 2 here.
 496 */
 497static int dvb_net_ule_new_payload(struct dvb_net_ule_handle *h)
 498{
 499	if (h->ts_remain < 2) {
 500		pr_warn("Invalid payload packing: only %d bytes left in TS.  Resyncing.\n",
 501			h->ts_remain);
 502		h->priv->ule_sndu_len = 0;
 503		h->priv->need_pusi = 1;
 504		h->ts += TS_SZ;
 505		return 1;
 506	}
 507
 508	if (!h->priv->ule_sndu_len) {
 509		/* Got at least two bytes, thus extrace the SNDU length. */
 510		h->priv->ule_sndu_len = h->from_where[0] << 8 |
 511					h->from_where[1];
 512		if (h->priv->ule_sndu_len & 0x8000) {
 513			/* D-Bit is set: no dest mac present. */
 514			h->priv->ule_sndu_len &= 0x7FFF;
 515			h->priv->ule_dbit = 1;
 516		} else
 517			h->priv->ule_dbit = 0;
 518
 519		if (h->priv->ule_sndu_len < 5) {
 520			pr_warn("%lu: Invalid ULE SNDU length %u. Resyncing.\n",
 521				h->priv->ts_count,
 522				h->priv->ule_sndu_len);
 523			h->dev->stats.rx_errors++;
 524			h->dev->stats.rx_length_errors++;
 525			h->priv->ule_sndu_len = 0;
 526			h->priv->need_pusi = 1;
 527			h->new_ts = 1;
 528			h->ts += TS_SZ;
 529			h->priv->ts_count++;
 530			return 1;
 531		}
 532		h->ts_remain -= 2;	/* consume the 2 bytes SNDU length. */
 533		h->from_where += 2;
 534	}
 535
 536	h->priv->ule_sndu_remain = h->priv->ule_sndu_len + 2;
 537	/*
 538	 * State of current TS:
 539	 *   h->ts_remain (remaining bytes in the current TS cell)
 540	 *   0	ule_type is not available now, we need the next TS cell
 541	 *   1	the first byte of the ule_type is present
 542	 * >=2	full ULE header present, maybe some payload data as well.
 543	 */
 544	switch (h->ts_remain) {
 545	case 1:
 546		h->priv->ule_sndu_remain--;
 547		h->priv->ule_sndu_type = h->from_where[0] << 8;
 548
 549		/* first byte of ule_type is set. */
 550		h->priv->ule_sndu_type_1 = 1;
 551		h->ts_remain -= 1;
 552		h->from_where += 1;
 553		fallthrough;
 554	case 0:
 555		h->new_ts = 1;
 556		h->ts += TS_SZ;
 557		h->priv->ts_count++;
 558		return 1;
 559
 560	default: /* complete ULE header is present in current TS. */
 561		/* Extract ULE type field. */
 562		if (h->priv->ule_sndu_type_1) {
 563			h->priv->ule_sndu_type_1 = 0;
 564			h->priv->ule_sndu_type |= h->from_where[0];
 565			h->from_where += 1; /* points to payload start. */
 566			h->ts_remain -= 1;
 567		} else {
 568			/* Complete type is present in new TS. */
 569			h->priv->ule_sndu_type = h->from_where[0] << 8 |
 570						 h->from_where[1];
 571			h->from_where += 2; /* points to payload start. */
 572			h->ts_remain -= 2;
 573		}
 574		break;
 575	}
 576
 577	/*
 578	 * Allocate the skb (decoder target buffer) with the correct size,
 579	 * as follows:
 580	 *
 581	 * prepare for the largest case: bridged SNDU with MAC address
 582	 * (dbit = 0).
 583	 */
 584	h->priv->ule_skb = dev_alloc_skb(h->priv->ule_sndu_len +
 585					 ETH_HLEN + ETH_ALEN);
 586	if (!h->priv->ule_skb) {
 587		pr_notice("%s: Memory squeeze, dropping packet.\n",
 588			  h->dev->name);
 589		h->dev->stats.rx_dropped++;
 590		return -1;
 591	}
 592
 593	/* This includes the CRC32 _and_ dest mac, if !dbit. */
 594	h->priv->ule_sndu_remain = h->priv->ule_sndu_len;
 595	h->priv->ule_skb->dev = h->dev;
 596	/*
 597	 * Leave space for Ethernet or bridged SNDU header
 598	 * (eth hdr plus one MAC addr).
 599	 */
 600	skb_reserve(h->priv->ule_skb, ETH_HLEN + ETH_ALEN);
 601
 602	return 0;
 603}
 604
 605
 606static int dvb_net_ule_should_drop(struct dvb_net_ule_handle *h)
 607{
 608	static const u8 bc_addr[ETH_ALEN] = { [0 ... ETH_ALEN - 1] = 0xff };
 609
 610	/*
 611	 * The destination MAC address is the next data in the skb.  It comes
 612	 * before any extension headers.
 613	 *
 614	 * Check if the payload of this SNDU should be passed up the stack.
 615	 */
 616	if (h->priv->rx_mode == RX_MODE_PROMISC)
 617		return 0;
 618
 619	if (h->priv->ule_skb->data[0] & 0x01) {
 620		/* multicast or broadcast */
 621		if (!ether_addr_equal(h->priv->ule_skb->data, bc_addr)) {
 622			/* multicast */
 623			if (h->priv->rx_mode == RX_MODE_MULTI) {
 624				int i;
 625
 626				for (i = 0; i < h->priv->multi_num &&
 627				     !ether_addr_equal(h->priv->ule_skb->data,
 628						       h->priv->multi_macs[i]);
 629				     i++)
 630					;
 631				if (i == h->priv->multi_num)
 632					return 1;
 633			} else if (h->priv->rx_mode != RX_MODE_ALL_MULTI)
 634				return 1; /* no broadcast; */
 635			/*
 636			 * else:
 637			 * all multicast mode: accept all multicast packets
 638			 */
 639		}
 640		/* else: broadcast */
 641	} else if (!ether_addr_equal(h->priv->ule_skb->data, h->dev->dev_addr))
 642		return 1;
 643
 644	return 0;
 645}
 646
 647
 648static void dvb_net_ule_check_crc(struct dvb_net_ule_handle *h,
 649				  struct kvec iov[3],
 650				  u32 ule_crc, u32 expected_crc)
 651{
 652	u8 dest_addr[ETH_ALEN];
 653
 654	if (ule_crc != expected_crc) {
 655		pr_warn("%lu: CRC32 check FAILED: %08x / %08x, SNDU len %d type %#x, ts_remain %d, next 2: %x.\n",
 656			h->priv->ts_count, ule_crc, expected_crc,
 657			h->priv->ule_sndu_len, h->priv->ule_sndu_type,
 658			h->ts_remain,
 659			h->ts_remain > 2 ?
 660				*(unsigned short *)h->from_where : 0);
 661
 662	#ifdef DVB_ULE_DEBUG
 663		hexdump(iov[0].iov_base, iov[0].iov_len);
 664		hexdump(iov[1].iov_base, iov[1].iov_len);
 665		hexdump(iov[2].iov_base, iov[2].iov_len);
 666
 667		if (ule_where == ule_hist) {
 668			hexdump(&ule_hist[98*TS_SZ], TS_SZ);
 669			hexdump(&ule_hist[99*TS_SZ], TS_SZ);
 670		} else if (ule_where == &ule_hist[TS_SZ]) {
 671			hexdump(&ule_hist[99*TS_SZ], TS_SZ);
 672			hexdump(ule_hist, TS_SZ);
 673		} else {
 674			hexdump(ule_where - TS_SZ - TS_SZ, TS_SZ);
 675			hexdump(ule_where - TS_SZ, TS_SZ);
 676		}
 677		ule_dump = 1;
 678	#endif
 679
 680		h->dev->stats.rx_errors++;
 681		h->dev->stats.rx_crc_errors++;
 682		dev_kfree_skb(h->priv->ule_skb);
 683
 684		return;
 685	}
 686
 687	/* CRC32 verified OK. */
 688
 689	/* CRC32 was OK, so remove it from skb. */
 690	h->priv->ule_skb->tail -= 4;
 691	h->priv->ule_skb->len -= 4;
 692
 693	if (!h->priv->ule_dbit) {
 694		if (dvb_net_ule_should_drop(h)) {
 695			netdev_dbg(h->dev,
 696				   "Dropping SNDU: MAC destination address does not match: dest addr: %pM, h->dev addr: %pM\n",
 697				   h->priv->ule_skb->data, h->dev->dev_addr);
 698			dev_kfree_skb(h->priv->ule_skb);
 699			return;
 700		}
 701
 702		skb_copy_from_linear_data(h->priv->ule_skb, dest_addr,
 703					  ETH_ALEN);
 704		skb_pull(h->priv->ule_skb, ETH_ALEN);
 705	} else {
 706		/* dest_addr buffer is only valid if h->priv->ule_dbit == 0 */
 707		eth_zero_addr(dest_addr);
 708	}
 709
 710	/* Handle ULE Extension Headers. */
 711	if (h->priv->ule_sndu_type < ETH_P_802_3_MIN) {
 712		/* There is an extension header.  Handle it accordingly. */
 713		int l = handle_ule_extensions(h->priv);
 714
 715		if (l < 0) {
 716			/*
 717			 * Mandatory extension header unknown or TEST SNDU.
 718			 * Drop it.
 719			 */
 720
 721			// pr_warn("Dropping SNDU, extension headers.\n" );
 722			dev_kfree_skb(h->priv->ule_skb);
 723			return;
 724		}
 725		skb_pull(h->priv->ule_skb, l);
 726	}
 727
 728	/*
 729	 * Construct/assure correct ethernet header.
 730	 * Note: in bridged mode (h->priv->ule_bridged != 0)
 731	 * we already have the (original) ethernet
 732	 * header at the start of the payload (after
 733	 * optional dest. address and any extension
 734	 * headers).
 735	 */
 736	if (!h->priv->ule_bridged) {
 737		skb_push(h->priv->ule_skb, ETH_HLEN);
 738		h->ethh = (struct ethhdr *)h->priv->ule_skb->data;
 739		memcpy(h->ethh->h_dest, dest_addr, ETH_ALEN);
 740		eth_zero_addr(h->ethh->h_source);
 741		h->ethh->h_proto = htons(h->priv->ule_sndu_type);
 742	}
 743	/* else:  skb is in correct state; nothing to do. */
 744	h->priv->ule_bridged = 0;
 745
 746	/* Stuff into kernel's protocol stack. */
 747	h->priv->ule_skb->protocol = dvb_net_eth_type_trans(h->priv->ule_skb,
 748							   h->dev);
 749	/*
 750	 * If D-bit is set (i.e. destination MAC address not present),
 751	 * receive the packet anyhow.
 752	 */
 753#if 0
 754	if (h->priv->ule_dbit && skb->pkt_type == PACKET_OTHERHOST)
 755		h->priv->ule_skb->pkt_type = PACKET_HOST;
 756#endif
 757	h->dev->stats.rx_packets++;
 758	h->dev->stats.rx_bytes += h->priv->ule_skb->len;
 759	netif_rx(h->priv->ule_skb);
 760}
 761
 762static void dvb_net_ule(struct net_device *dev, const u8 *buf, size_t buf_len)
 763{
 764	int ret;
 765	struct dvb_net_ule_handle h = {
 766		.dev = dev,
 767		.priv = netdev_priv(dev),
 768		.ethh = NULL,
 769		.buf = buf,
 770		.buf_len = buf_len,
 771		.skipped = 0L,
 772		.ts = NULL,
 773		.ts_end = NULL,
 774		.from_where = NULL,
 775		.ts_remain = 0,
 776		.how_much = 0,
 777		.new_ts = 1,
 778		.error = false,
 779	};
 780
 781	/*
 782	 * For all TS cells in current buffer.
 783	 * Appearently, we are called for every single TS cell.
 784	 */
 785	for (h.ts = h.buf, h.ts_end = h.buf + h.buf_len;
 786	     h.ts < h.ts_end; /* no incr. */) {
 787		if (h.new_ts) {
 788			/* We are about to process a new TS cell. */
 789			if (dvb_net_ule_new_ts_cell(&h))
 790				continue;
 791		}
 792
 793		/* Synchronize on PUSI, if required. */
 794		if (h.priv->need_pusi) {
 795			if (dvb_net_ule_ts_pusi(&h))
 796				continue;
 797		}
 798
 799		if (h.new_ts) {
 800			if (dvb_net_ule_new_ts(&h))
 801				continue;
 802		}
 803
 804		/* Check if new payload needs to be started. */
 805		if (h.priv->ule_skb == NULL) {
 806			ret = dvb_net_ule_new_payload(&h);
 807			if (ret < 0)
 808				return;
 809			if (ret)
 810				continue;
 811		}
 812
 813		/* Copy data into our current skb. */
 814		h.how_much = min(h.priv->ule_sndu_remain, (int)h.ts_remain);
 815		skb_put_data(h.priv->ule_skb, h.from_where, h.how_much);
 816		h.priv->ule_sndu_remain -= h.how_much;
 817		h.ts_remain -= h.how_much;
 818		h.from_where += h.how_much;
 819
 820		/* Check for complete payload. */
 821		if (h.priv->ule_sndu_remain <= 0) {
 822			/* Check CRC32, we've got it in our skb already. */
 823			__be16 ulen = htons(h.priv->ule_sndu_len);
 824			__be16 utype = htons(h.priv->ule_sndu_type);
 825			const u8 *tail;
 826			struct kvec iov[3] = {
 827				{ &ulen, sizeof ulen },
 828				{ &utype, sizeof utype },
 829				{ h.priv->ule_skb->data,
 830				  h.priv->ule_skb->len - 4 }
 831			};
 832			u32 ule_crc = ~0L, expected_crc;
 833			if (h.priv->ule_dbit) {
 834				/* Set D-bit for CRC32 verification,
 835				 * if it was set originally. */
 836				ulen |= htons(0x8000);
 837			}
 838
 839			ule_crc = iov_crc32(ule_crc, iov, 3);
 840			tail = skb_tail_pointer(h.priv->ule_skb);
 841			expected_crc = *(tail - 4) << 24 |
 842				       *(tail - 3) << 16 |
 843				       *(tail - 2) << 8 |
 844				       *(tail - 1);
 845
 846			dvb_net_ule_check_crc(&h, iov, ule_crc, expected_crc);
 847
 848			/* Prepare for next SNDU. */
 849			reset_ule(h.priv);
 850		}
 851
 852		/* More data in current TS (look at the bytes following the CRC32)? */
 853		if (h.ts_remain >= 2 && *((unsigned short *)h.from_where) != 0xFFFF) {
 854			/* Next ULE SNDU starts right there. */
 855			h.new_ts = 0;
 856			h.priv->ule_skb = NULL;
 857			h.priv->ule_sndu_type_1 = 0;
 858			h.priv->ule_sndu_len = 0;
 859			// pr_warn("More data in current TS: [%#x %#x %#x %#x]\n",
 860			//	*(h.from_where + 0), *(h.from_where + 1),
 861			//	*(h.from_where + 2), *(h.from_where + 3));
 862			// pr_warn("h.ts @ %p, stopped @ %p:\n", h.ts, h.from_where + 0);
 863			// hexdump(h.ts, 188);
 864		} else {
 865			h.new_ts = 1;
 866			h.ts += TS_SZ;
 867			h.priv->ts_count++;
 868			if (h.priv->ule_skb == NULL) {
 869				h.priv->need_pusi = 1;
 870				h.priv->ule_sndu_type_1 = 0;
 871				h.priv->ule_sndu_len = 0;
 872			}
 873		}
 874	}	/* for all available TS cells */
 875}
 876
 877static int dvb_net_ts_callback(const u8 *buffer1, size_t buffer1_len,
 878			       const u8 *buffer2, size_t buffer2_len,
 879			       struct dmx_ts_feed *feed,
 880			       u32 *buffer_flags)
 881{
 882	struct net_device *dev = feed->priv;
 883
 884	if (buffer2)
 885		pr_warn("buffer2 not NULL: %p.\n", buffer2);
 886	if (buffer1_len > 32768)
 887		pr_warn("length > 32k: %zu.\n", buffer1_len);
 888	/* pr_info("TS callback: %u bytes, %u TS cells @ %p.\n",
 889		  buffer1_len, buffer1_len / TS_SZ, buffer1); */
 890	dvb_net_ule(dev, buffer1, buffer1_len);
 891	return 0;
 892}
 893
 894
 895static void dvb_net_sec(struct net_device *dev,
 896			const u8 *pkt, int pkt_len)
 897{
 898	u8 *eth;
 899	struct sk_buff *skb;
 900	struct net_device_stats *stats = &dev->stats;
 901	int snap = 0;
 902
 903	/* note: pkt_len includes a 32bit checksum */
 904	if (pkt_len < 16) {
 905		pr_warn("%s: IP/MPE packet length = %d too small.\n",
 906			dev->name, pkt_len);
 907		stats->rx_errors++;
 908		stats->rx_length_errors++;
 909		return;
 910	}
 911/* it seems some ISPs manage to screw up here, so we have to
 912 * relax the error checks... */
 913#if 0
 914	if ((pkt[5] & 0xfd) != 0xc1) {
 915		/* drop scrambled or broken packets */
 916#else
 917	if ((pkt[5] & 0x3c) != 0x00) {
 918		/* drop scrambled */
 919#endif
 920		stats->rx_errors++;
 921		stats->rx_crc_errors++;
 922		return;
 923	}
 924	if (pkt[5] & 0x02) {
 925		/* handle LLC/SNAP, see rfc-1042 */
 926		if (pkt_len < 24 || memcmp(&pkt[12], "\xaa\xaa\x03\0\0\0", 6)) {
 927			stats->rx_dropped++;
 928			return;
 929		}
 930		snap = 8;
 931	}
 932	if (pkt[7]) {
 933		/* FIXME: assemble datagram from multiple sections */
 934		stats->rx_errors++;
 935		stats->rx_frame_errors++;
 936		return;
 937	}
 938
 939	/* we have 14 byte ethernet header (ip header follows);
 940	 * 12 byte MPE header; 4 byte checksum; + 2 byte alignment, 8 byte LLC/SNAP
 941	 */
 942	if (!(skb = dev_alloc_skb(pkt_len - 4 - 12 + 14 + 2 - snap))) {
 943		//pr_notice("%s: Memory squeeze, dropping packet.\n", dev->name);
 944		stats->rx_dropped++;
 945		return;
 946	}
 947	skb_reserve(skb, 2);    /* longword align L3 header */
 948	skb->dev = dev;
 949
 950	/* copy L3 payload */
 951	eth = skb_put(skb, pkt_len - 12 - 4 + 14 - snap);
 952	memcpy(eth + 14, pkt + 12 + snap, pkt_len - 12 - 4 - snap);
 953
 954	/* create ethernet header: */
 955	eth[0]=pkt[0x0b];
 956	eth[1]=pkt[0x0a];
 957	eth[2]=pkt[0x09];
 958	eth[3]=pkt[0x08];
 959	eth[4]=pkt[0x04];
 960	eth[5]=pkt[0x03];
 961
 962	eth[6]=eth[7]=eth[8]=eth[9]=eth[10]=eth[11]=0;
 963
 964	if (snap) {
 965		eth[12] = pkt[18];
 966		eth[13] = pkt[19];
 967	} else {
 968		/* protocol numbers are from rfc-1700 or
 969		 * http://www.iana.org/assignments/ethernet-numbers
 970		 */
 971		if (pkt[12] >> 4 == 6) { /* version field from IP header */
 972			eth[12] = 0x86;	/* IPv6 */
 973			eth[13] = 0xdd;
 974		} else {
 975			eth[12] = 0x08;	/* IPv4 */
 976			eth[13] = 0x00;
 977		}
 978	}
 979
 980	skb->protocol = dvb_net_eth_type_trans(skb, dev);
 981
 982	stats->rx_packets++;
 983	stats->rx_bytes+=skb->len;
 984	netif_rx(skb);
 985}
 986
 987static int dvb_net_sec_callback(const u8 *buffer1, size_t buffer1_len,
 988		 const u8 *buffer2, size_t buffer2_len,
 989		 struct dmx_section_filter *filter, u32 *buffer_flags)
 990{
 991	struct net_device *dev = filter->priv;
 992
 993	/*
 994	 * we rely on the DVB API definition where exactly one complete
 995	 * section is delivered in buffer1
 996	 */
 997	dvb_net_sec (dev, buffer1, buffer1_len);
 998	return 0;
 999}
1000
1001static netdev_tx_t dvb_net_tx(struct sk_buff *skb, struct net_device *dev)
1002{
1003	dev_kfree_skb(skb);
1004	return NETDEV_TX_OK;
1005}
1006
1007static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1008static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
1009static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
1010static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1011
1012static int dvb_net_filter_sec_set(struct net_device *dev,
1013		   struct dmx_section_filter **secfilter,
1014		   const u8 *mac, u8 *mac_mask)
1015{
1016	struct dvb_net_priv *priv = netdev_priv(dev);
1017	int ret;
1018
1019	*secfilter=NULL;
1020	ret = priv->secfeed->allocate_filter(priv->secfeed, secfilter);
1021	if (ret<0) {
1022		pr_err("%s: could not get filter\n", dev->name);
1023		return ret;
1024	}
1025
1026	(*secfilter)->priv=(void *) dev;
1027
1028	memset((*secfilter)->filter_value, 0x00, DMX_MAX_FILTER_SIZE);
1029	memset((*secfilter)->filter_mask,  0x00, DMX_MAX_FILTER_SIZE);
1030	memset((*secfilter)->filter_mode,  0xff, DMX_MAX_FILTER_SIZE);
1031
1032	(*secfilter)->filter_value[0]=0x3e;
1033	(*secfilter)->filter_value[3]=mac[5];
1034	(*secfilter)->filter_value[4]=mac[4];
1035	(*secfilter)->filter_value[8]=mac[3];
1036	(*secfilter)->filter_value[9]=mac[2];
1037	(*secfilter)->filter_value[10]=mac[1];
1038	(*secfilter)->filter_value[11]=mac[0];
1039
1040	(*secfilter)->filter_mask[0] = 0xff;
1041	(*secfilter)->filter_mask[3] = mac_mask[5];
1042	(*secfilter)->filter_mask[4] = mac_mask[4];
1043	(*secfilter)->filter_mask[8] = mac_mask[3];
1044	(*secfilter)->filter_mask[9] = mac_mask[2];
1045	(*secfilter)->filter_mask[10] = mac_mask[1];
1046	(*secfilter)->filter_mask[11]=mac_mask[0];
1047
1048	netdev_dbg(dev, "filter mac=%pM mask=%pM\n", mac, mac_mask);
1049
1050	return 0;
1051}
1052
1053static int dvb_net_feed_start(struct net_device *dev)
1054{
1055	int ret = 0, i;
1056	struct dvb_net_priv *priv = netdev_priv(dev);
1057	struct dmx_demux *demux = priv->demux;
1058	const unsigned char *mac = (const unsigned char *) dev->dev_addr;
1059
1060	netdev_dbg(dev, "rx_mode %i\n", priv->rx_mode);
1061	mutex_lock(&priv->mutex);
1062	if (priv->tsfeed || priv->secfeed || priv->secfilter || priv->multi_secfilter[0])
1063		pr_err("%s: BUG %d\n", __func__, __LINE__);
1064
1065	priv->secfeed=NULL;
1066	priv->secfilter=NULL;
1067	priv->tsfeed = NULL;
1068
1069	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1070		netdev_dbg(dev, "alloc secfeed\n");
1071		ret=demux->allocate_section_feed(demux, &priv->secfeed,
1072					 dvb_net_sec_callback);
1073		if (ret<0) {
1074			pr_err("%s: could not allocate section feed\n",
1075			       dev->name);
1076			goto error;
1077		}
1078
1079		ret = priv->secfeed->set(priv->secfeed, priv->pid, 1);
1080
1081		if (ret<0) {
1082			pr_err("%s: could not set section feed\n", dev->name);
1083			priv->demux->release_section_feed(priv->demux, priv->secfeed);
1084			priv->secfeed=NULL;
1085			goto error;
1086		}
1087
1088		if (priv->rx_mode != RX_MODE_PROMISC) {
1089			netdev_dbg(dev, "set secfilter\n");
1090			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_normal);
1091		}
1092
1093		switch (priv->rx_mode) {
1094		case RX_MODE_MULTI:
1095			for (i = 0; i < priv->multi_num; i++) {
1096				netdev_dbg(dev, "set multi_secfilter[%d]\n", i);
1097				dvb_net_filter_sec_set(dev, &priv->multi_secfilter[i],
1098						       priv->multi_macs[i], mask_normal);
1099			}
1100			break;
1101		case RX_MODE_ALL_MULTI:
1102			priv->multi_num=1;
1103			netdev_dbg(dev, "set multi_secfilter[0]\n");
1104			dvb_net_filter_sec_set(dev, &priv->multi_secfilter[0],
1105					       mac_allmulti, mask_allmulti);
1106			break;
1107		case RX_MODE_PROMISC:
1108			priv->multi_num=0;
1109			netdev_dbg(dev, "set secfilter\n");
1110			dvb_net_filter_sec_set(dev, &priv->secfilter, mac, mask_promisc);
1111			break;
1112		}
1113
1114		netdev_dbg(dev, "start filtering\n");
1115		priv->secfeed->start_filtering(priv->secfeed);
1116	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1117		ktime_t timeout = ns_to_ktime(10 * NSEC_PER_MSEC);
1118
1119		/* we have payloads encapsulated in TS */
1120		netdev_dbg(dev, "alloc tsfeed\n");
1121		ret = demux->allocate_ts_feed(demux, &priv->tsfeed, dvb_net_ts_callback);
1122		if (ret < 0) {
1123			pr_err("%s: could not allocate ts feed\n", dev->name);
1124			goto error;
1125		}
1126
1127		/* Set netdevice pointer for ts decaps callback. */
1128		priv->tsfeed->priv = (void *)dev;
1129		ret = priv->tsfeed->set(priv->tsfeed,
1130					priv->pid, /* pid */
1131					TS_PACKET, /* type */
1132					DMX_PES_OTHER, /* pes type */
1133					timeout    /* timeout */
1134					);
1135
1136		if (ret < 0) {
1137			pr_err("%s: could not set ts feed\n", dev->name);
1138			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1139			priv->tsfeed = NULL;
1140			goto error;
1141		}
1142
1143		netdev_dbg(dev, "start filtering\n");
1144		priv->tsfeed->start_filtering(priv->tsfeed);
1145	} else
1146		ret = -EINVAL;
1147
1148error:
1149	mutex_unlock(&priv->mutex);
1150	return ret;
1151}
1152
1153static int dvb_net_feed_stop(struct net_device *dev)
1154{
1155	struct dvb_net_priv *priv = netdev_priv(dev);
1156	int i, ret = 0;
1157
1158	mutex_lock(&priv->mutex);
1159	if (priv->feedtype == DVB_NET_FEEDTYPE_MPE) {
1160		if (priv->secfeed) {
1161			if (priv->secfeed->is_filtering) {
1162				netdev_dbg(dev, "stop secfeed\n");
1163				priv->secfeed->stop_filtering(priv->secfeed);
1164			}
1165
1166			if (priv->secfilter) {
1167				netdev_dbg(dev, "release secfilter\n");
1168				priv->secfeed->release_filter(priv->secfeed,
1169							      priv->secfilter);
1170				priv->secfilter=NULL;
1171			}
1172
1173			for (i=0; i<priv->multi_num; i++) {
1174				if (priv->multi_secfilter[i]) {
1175					netdev_dbg(dev, "release multi_filter[%d]\n",
1176						   i);
1177					priv->secfeed->release_filter(priv->secfeed,
1178								      priv->multi_secfilter[i]);
1179					priv->multi_secfilter[i] = NULL;
1180				}
1181			}
1182
1183			priv->demux->release_section_feed(priv->demux, priv->secfeed);
1184			priv->secfeed = NULL;
1185		} else
1186			pr_err("%s: no feed to stop\n", dev->name);
1187	} else if (priv->feedtype == DVB_NET_FEEDTYPE_ULE) {
1188		if (priv->tsfeed) {
1189			if (priv->tsfeed->is_filtering) {
1190				netdev_dbg(dev, "stop tsfeed\n");
1191				priv->tsfeed->stop_filtering(priv->tsfeed);
1192			}
1193			priv->demux->release_ts_feed(priv->demux, priv->tsfeed);
1194			priv->tsfeed = NULL;
1195		}
1196		else
1197			pr_err("%s: no ts feed to stop\n", dev->name);
1198	} else
1199		ret = -EINVAL;
1200	mutex_unlock(&priv->mutex);
1201	return ret;
1202}
1203
1204
1205static int dvb_set_mc_filter(struct net_device *dev, unsigned char *addr)
1206{
1207	struct dvb_net_priv *priv = netdev_priv(dev);
1208
1209	if (priv->multi_num == DVB_NET_MULTICAST_MAX)
1210		return -ENOMEM;
1211
1212	memcpy(priv->multi_macs[priv->multi_num], addr, ETH_ALEN);
1213
1214	priv->multi_num++;
1215	return 0;
1216}
1217
1218
1219static void wq_set_multicast_list (struct work_struct *work)
1220{
1221	struct dvb_net_priv *priv =
1222		container_of(work, struct dvb_net_priv, set_multicast_list_wq);
1223	struct net_device *dev = priv->net;
1224
1225	dvb_net_feed_stop(dev);
1226	priv->rx_mode = RX_MODE_UNI;
1227	netif_addr_lock_bh(dev);
1228
1229	if (dev->flags & IFF_PROMISC) {
1230		netdev_dbg(dev, "promiscuous mode\n");
1231		priv->rx_mode = RX_MODE_PROMISC;
1232	} else if ((dev->flags & IFF_ALLMULTI)) {
1233		netdev_dbg(dev, "allmulti mode\n");
1234		priv->rx_mode = RX_MODE_ALL_MULTI;
1235	} else if (!netdev_mc_empty(dev)) {
1236		struct netdev_hw_addr *ha;
1237
1238		netdev_dbg(dev, "set_mc_list, %d entries\n",
1239			   netdev_mc_count(dev));
1240
1241		priv->rx_mode = RX_MODE_MULTI;
1242		priv->multi_num = 0;
1243
1244		netdev_for_each_mc_addr(ha, dev)
1245			dvb_set_mc_filter(dev, ha->addr);
1246	}
1247
1248	netif_addr_unlock_bh(dev);
1249	dvb_net_feed_start(dev);
1250}
1251
1252
1253static void dvb_net_set_multicast_list (struct net_device *dev)
1254{
1255	struct dvb_net_priv *priv = netdev_priv(dev);
1256	schedule_work(&priv->set_multicast_list_wq);
1257}
1258
1259
1260static void wq_restart_net_feed (struct work_struct *work)
1261{
1262	struct dvb_net_priv *priv =
1263		container_of(work, struct dvb_net_priv, restart_net_feed_wq);
1264	struct net_device *dev = priv->net;
1265
1266	if (netif_running(dev)) {
1267		dvb_net_feed_stop(dev);
1268		dvb_net_feed_start(dev);
1269	}
1270}
1271
1272
1273static int dvb_net_set_mac (struct net_device *dev, void *p)
1274{
1275	struct dvb_net_priv *priv = netdev_priv(dev);
1276	struct sockaddr *addr=p;
1277
1278	eth_hw_addr_set(dev, addr->sa_data);
1279
1280	if (netif_running(dev))
1281		schedule_work(&priv->restart_net_feed_wq);
1282
1283	return 0;
1284}
1285
1286
1287static int dvb_net_open(struct net_device *dev)
1288{
1289	struct dvb_net_priv *priv = netdev_priv(dev);
1290
1291	priv->in_use++;
1292	dvb_net_feed_start(dev);
1293	return 0;
1294}
1295
1296
1297static int dvb_net_stop(struct net_device *dev)
1298{
1299	struct dvb_net_priv *priv = netdev_priv(dev);
1300
1301	priv->in_use--;
1302	return dvb_net_feed_stop(dev);
1303}
1304
1305static const struct header_ops dvb_header_ops = {
1306	.create		= eth_header,
1307	.parse		= eth_header_parse,
1308};
1309
1310
1311static const struct net_device_ops dvb_netdev_ops = {
1312	.ndo_open		= dvb_net_open,
1313	.ndo_stop		= dvb_net_stop,
1314	.ndo_start_xmit		= dvb_net_tx,
1315	.ndo_set_rx_mode	= dvb_net_set_multicast_list,
1316	.ndo_set_mac_address    = dvb_net_set_mac,
1317	.ndo_validate_addr	= eth_validate_addr,
1318};
1319
1320static void dvb_net_setup(struct net_device *dev)
1321{
1322	ether_setup(dev);
1323
1324	dev->header_ops		= &dvb_header_ops;
1325	dev->netdev_ops		= &dvb_netdev_ops;
1326	dev->mtu		= 4096;
1327	dev->max_mtu		= 4096;
1328
1329	dev->flags |= IFF_NOARP;
1330}
1331
1332static int get_if(struct dvb_net *dvbnet)
1333{
1334	int i;
1335
1336	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1337		if (!dvbnet->state[i])
1338			break;
1339
1340	if (i == DVB_NET_DEVICES_MAX)
1341		return -1;
1342
1343	dvbnet->state[i]=1;
1344	return i;
1345}
1346
1347static int dvb_net_add_if(struct dvb_net *dvbnet, u16 pid, u8 feedtype)
1348{
1349	struct net_device *net;
1350	struct dvb_net_priv *priv;
1351	int result;
1352	int if_num;
1353
1354	if (feedtype != DVB_NET_FEEDTYPE_MPE && feedtype != DVB_NET_FEEDTYPE_ULE)
1355		return -EINVAL;
1356	if ((if_num = get_if(dvbnet)) < 0)
1357		return -EINVAL;
1358
1359	net = alloc_netdev(sizeof(struct dvb_net_priv), "dvb",
1360			   NET_NAME_UNKNOWN, dvb_net_setup);
1361	if (!net)
1362		return -ENOMEM;
1363
1364	if (dvbnet->dvbdev->id)
1365		snprintf(net->name, IFNAMSIZ, "dvb%d%u%d",
1366			 dvbnet->dvbdev->adapter->num, dvbnet->dvbdev->id, if_num);
1367	else
1368		/* compatibility fix to keep dvb0_0 format */
1369		snprintf(net->name, IFNAMSIZ, "dvb%d_%d",
1370			 dvbnet->dvbdev->adapter->num, if_num);
1371
1372	net->addr_len = 6;
1373	eth_hw_addr_set(net, dvbnet->dvbdev->adapter->proposed_mac);
1374
1375	dvbnet->device[if_num] = net;
1376
1377	priv = netdev_priv(net);
1378	priv->net = net;
1379	priv->demux = dvbnet->demux;
1380	priv->pid = pid;
1381	priv->rx_mode = RX_MODE_UNI;
1382	priv->need_pusi = 1;
1383	priv->tscc = 0;
1384	priv->feedtype = feedtype;
1385	reset_ule(priv);
1386
1387	INIT_WORK(&priv->set_multicast_list_wq, wq_set_multicast_list);
1388	INIT_WORK(&priv->restart_net_feed_wq, wq_restart_net_feed);
1389	mutex_init(&priv->mutex);
1390
1391	net->base_addr = pid;
1392
1393	if ((result = register_netdev(net)) < 0) {
1394		dvbnet->device[if_num] = NULL;
1395		free_netdev(net);
1396		return result;
1397	}
1398	pr_info("created network interface %s\n", net->name);
1399
1400	return if_num;
1401}
1402
1403static int dvb_net_remove_if(struct dvb_net *dvbnet, unsigned long num)
1404{
1405	struct net_device *net = dvbnet->device[num];
1406	struct dvb_net_priv *priv;
1407
1408	if (!dvbnet->state[num])
1409		return -EINVAL;
1410	priv = netdev_priv(net);
1411	if (priv->in_use)
1412		return -EBUSY;
1413
1414	dvb_net_stop(net);
1415	flush_work(&priv->set_multicast_list_wq);
1416	flush_work(&priv->restart_net_feed_wq);
1417	pr_info("removed network interface %s\n", net->name);
1418	unregister_netdev(net);
1419	dvbnet->state[num]=0;
1420	dvbnet->device[num] = NULL;
1421	free_netdev(net);
1422
1423	return 0;
1424}
1425
1426static int dvb_net_do_ioctl(struct file *file,
1427		  unsigned int cmd, void *parg)
1428{
1429	struct dvb_device *dvbdev = file->private_data;
1430	struct dvb_net *dvbnet = dvbdev->priv;
1431	int ret = 0;
1432
1433	if (((file->f_flags&O_ACCMODE)==O_RDONLY))
1434		return -EPERM;
1435
1436	if (mutex_lock_interruptible(&dvbnet->ioctl_mutex))
1437		return -ERESTARTSYS;
1438
1439	switch (cmd) {
1440	case NET_ADD_IF:
1441	{
1442		struct dvb_net_if *dvbnetif = parg;
1443		int result;
1444
1445		if (!capable(CAP_SYS_ADMIN)) {
1446			ret = -EPERM;
1447			goto ioctl_error;
1448		}
1449
1450		if (!try_module_get(dvbdev->adapter->module)) {
1451			ret = -EPERM;
1452			goto ioctl_error;
1453		}
1454
1455		result=dvb_net_add_if(dvbnet, dvbnetif->pid, dvbnetif->feedtype);
1456		if (result<0) {
1457			module_put(dvbdev->adapter->module);
1458			ret = result;
1459			goto ioctl_error;
1460		}
1461		dvbnetif->if_num=result;
1462		break;
1463	}
1464	case NET_GET_IF:
1465	{
1466		struct net_device *netdev;
1467		struct dvb_net_priv *priv_data;
1468		struct dvb_net_if *dvbnetif = parg;
1469		int if_num = dvbnetif->if_num;
1470
1471		if (if_num >= DVB_NET_DEVICES_MAX) {
1472			ret = -EINVAL;
1473			goto ioctl_error;
1474		}
1475		if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1476
1477		if (!dvbnet->state[if_num]) {
1478			ret = -EINVAL;
1479			goto ioctl_error;
1480		}
1481
1482		netdev = dvbnet->device[if_num];
1483
1484		priv_data = netdev_priv(netdev);
1485		dvbnetif->pid=priv_data->pid;
1486		dvbnetif->feedtype=priv_data->feedtype;
1487		break;
1488	}
1489	case NET_REMOVE_IF:
1490	{
1491		if (!capable(CAP_SYS_ADMIN)) {
1492			ret = -EPERM;
1493			goto ioctl_error;
1494		}
1495		if ((unsigned long) parg >= DVB_NET_DEVICES_MAX) {
1496			ret = -EINVAL;
1497			goto ioctl_error;
1498		}
1499		ret = dvb_net_remove_if(dvbnet, (unsigned long) parg);
1500		if (!ret)
1501			module_put(dvbdev->adapter->module);
1502		break;
1503	}
1504
1505	/* binary compatibility cruft */
1506	case __NET_ADD_IF_OLD:
1507	{
1508		struct __dvb_net_if_old *dvbnetif = parg;
1509		int result;
1510
1511		if (!capable(CAP_SYS_ADMIN)) {
1512			ret = -EPERM;
1513			goto ioctl_error;
1514		}
1515
1516		if (!try_module_get(dvbdev->adapter->module)) {
1517			ret = -EPERM;
1518			goto ioctl_error;
1519		}
1520
1521		result=dvb_net_add_if(dvbnet, dvbnetif->pid, DVB_NET_FEEDTYPE_MPE);
1522		if (result<0) {
1523			module_put(dvbdev->adapter->module);
1524			ret = result;
1525			goto ioctl_error;
1526		}
1527		dvbnetif->if_num=result;
1528		break;
1529	}
1530	case __NET_GET_IF_OLD:
1531	{
1532		struct net_device *netdev;
1533		struct dvb_net_priv *priv_data;
1534		struct __dvb_net_if_old *dvbnetif = parg;
1535		int if_num = dvbnetif->if_num;
1536
1537		if (if_num >= DVB_NET_DEVICES_MAX) {
1538			ret = -EINVAL;
1539			goto ioctl_error;
1540		}
1541		if_num = array_index_nospec(if_num, DVB_NET_DEVICES_MAX);
1542
1543		if (!dvbnet->state[if_num]) {
1544			ret = -EINVAL;
1545			goto ioctl_error;
1546		}
1547
1548		netdev = dvbnet->device[if_num];
1549
1550		priv_data = netdev_priv(netdev);
1551		dvbnetif->pid=priv_data->pid;
1552		break;
1553	}
1554	default:
1555		ret = -ENOTTY;
1556		break;
1557	}
1558
1559ioctl_error:
1560	mutex_unlock(&dvbnet->ioctl_mutex);
1561	return ret;
1562}
1563
1564static long dvb_net_ioctl(struct file *file,
1565	      unsigned int cmd, unsigned long arg)
1566{
1567	return dvb_usercopy(file, cmd, arg, dvb_net_do_ioctl);
1568}
1569
1570static int locked_dvb_net_open(struct inode *inode, struct file *file)
1571{
1572	struct dvb_device *dvbdev = file->private_data;
1573	struct dvb_net *dvbnet = dvbdev->priv;
1574	int ret;
1575
1576	if (mutex_lock_interruptible(&dvbnet->remove_mutex))
1577		return -ERESTARTSYS;
1578
1579	if (dvbnet->exit) {
1580		mutex_unlock(&dvbnet->remove_mutex);
1581		return -ENODEV;
1582	}
1583
1584	ret = dvb_generic_open(inode, file);
1585
1586	mutex_unlock(&dvbnet->remove_mutex);
1587
1588	return ret;
1589}
1590
1591static int dvb_net_close(struct inode *inode, struct file *file)
1592{
1593	struct dvb_device *dvbdev = file->private_data;
1594	struct dvb_net *dvbnet = dvbdev->priv;
1595
1596	mutex_lock(&dvbnet->remove_mutex);
1597
1598	dvb_generic_release(inode, file);
1599
1600	if (dvbdev->users == 1 && dvbnet->exit == 1) {
1601		mutex_unlock(&dvbnet->remove_mutex);
1602		wake_up(&dvbdev->wait_queue);
1603	} else {
1604		mutex_unlock(&dvbnet->remove_mutex);
1605	}
1606
1607	return 0;
1608}
1609
1610
1611static const struct file_operations dvb_net_fops = {
1612	.owner = THIS_MODULE,
1613	.unlocked_ioctl = dvb_net_ioctl,
1614	.open =	locked_dvb_net_open,
1615	.release = dvb_net_close,
1616	.llseek = noop_llseek,
1617};
1618
1619static const struct dvb_device dvbdev_net = {
1620	.priv = NULL,
1621	.users = 1,
1622	.writers = 1,
1623#if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1624	.name = "dvb-net",
1625#endif
1626	.fops = &dvb_net_fops,
1627};
1628
1629void dvb_net_release (struct dvb_net *dvbnet)
1630{
1631	int i;
1632
1633	mutex_lock(&dvbnet->remove_mutex);
1634	dvbnet->exit = 1;
1635	mutex_unlock(&dvbnet->remove_mutex);
1636
1637	if (dvbnet->dvbdev->users < 1)
1638		wait_event(dvbnet->dvbdev->wait_queue,
1639				dvbnet->dvbdev->users == 1);
1640
1641	dvb_unregister_device(dvbnet->dvbdev);
1642
1643	for (i=0; i<DVB_NET_DEVICES_MAX; i++) {
1644		if (!dvbnet->state[i])
1645			continue;
1646		dvb_net_remove_if(dvbnet, i);
1647	}
1648}
1649EXPORT_SYMBOL(dvb_net_release);
1650
1651
1652int dvb_net_init (struct dvb_adapter *adap, struct dvb_net *dvbnet,
1653		  struct dmx_demux *dmx)
1654{
1655	int i;
1656
1657	mutex_init(&dvbnet->ioctl_mutex);
1658	mutex_init(&dvbnet->remove_mutex);
1659	dvbnet->demux = dmx;
1660
1661	for (i=0; i<DVB_NET_DEVICES_MAX; i++)
1662		dvbnet->state[i] = 0;
1663
1664	return dvb_register_device(adap, &dvbnet->dvbdev, &dvbdev_net,
1665			     dvbnet, DVB_DEVICE_NET, 0);
1666}
1667EXPORT_SYMBOL(dvb_net_init);