drivers/media/dvb-core/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 <[email protected]>
   7  * Copyright (C) 2002 Ralph Metzler <[email protected]>
   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 <[email protected]>
  14  *                      and Wolfram Stering <[email protected]>
  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 <[email protected]>,
  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
  60 static 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  */
  76 static unsigned char ule_hist[100*TS_SZ] = { 0 };
  77 static unsigned char *ule_where = ule_hist, ule_dump;
  78
  79 static 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
  85 struct 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 <[email protected]>
 128  */
 129 static __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
 181 static int ule_test_sndu( struct dvb_net_priv *p )
 182 {
 183         return -1;
 184 }
 185
 186 static 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
 206 static 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  */
 217 static 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
 266 static 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. */
 287 static 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
 304 struct 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
 316 static 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
 364 static 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
 392 static 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  */
 494 static 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
 603 static 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
 645 static 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
 759 static 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
 874 static 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
 892 static 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
 984 static 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
 998 static 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
1004 static u8 mask_normal[6]={0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
1005 static u8 mask_allmulti[6]={0xff, 0xff, 0xff, 0x00, 0x00, 0x00};
1006 static u8 mac_allmulti[6]={0x01, 0x00, 0x5e, 0x00, 0x00, 0x00};
1007 static u8 mask_promisc[6]={0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
1008
1009 static 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
1050 static 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
1145 error:
1146         mutex_unlock(&priv->mutex);
1147         return ret;
1148 }
1149
1150 static 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
1202 static 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
1216 static 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
1250 static 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
1257 static 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
1270 static 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
1284 static 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
1294 static 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
1302 static const struct header_ops dvb_header_ops = {
1303         .create         = eth_header,
1304         .parse          = eth_header_parse,
1305 };
1306
1307
1308 static 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
1317 static 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
1329 static 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
1344 static 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
1400 static 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
1423 static 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
1556 ioctl_error:
1557         mutex_unlock(&dvbnet->ioctl_mutex);
1558         return ret;
1559 }
1560
1561 static 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
1567 static 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
1588 static 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
1608 static 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
1616 static 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
1626 void 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 }
1646 EXPORT_SYMBOL(dvb_net_release);
1647
1648
1649 int 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 }
1664 EXPORT_SYMBOL(dvb_net_init);