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