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