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