1/* 2 * pcap-dag.c: Packet capture interface for Endace DAG cards. 3 * 4 * Authors: Richard Littin, Sean Irvine ({richard,sean}@reeltwo.com) 5 * Modifications: Jesper Peterson 6 * Koryn Grant 7 * Stephen Donnelly <stephen.donnelly@endace.com> 8 */ 9 10#ifdef HAVE_CONFIG_H 11#include <config.h> 12#endif 13 14#include <sys/param.h> /* optionally get BSD define */ 15 16#include <stdlib.h> 17#include <string.h> 18#include <errno.h> 19 20#include "pcap-int.h" 21 22#include <ctype.h> 23#include <netinet/in.h> 24#include <sys/mman.h> 25#include <sys/socket.h> 26#include <sys/types.h> 27#include <unistd.h> 28 29struct mbuf; /* Squelch compiler warnings on some platforms for */ 30struct rtentry; /* declarations in <net/if.h> */ 31#include <net/if.h> 32 33#include "dagnew.h" 34#include "dagapi.h" 35#include "dagpci.h" 36#include "dag_config_api.h" 37 38#include "pcap-dag.h" 39 40/* 41 * DAG devices have names beginning with "dag", followed by a number 42 * from 0 to DAG_MAX_BOARDS, then optionally a colon and a stream number 43 * from 0 to DAG_STREAM_MAX. 44 */ 45#ifndef DAG_MAX_BOARDS 46#define DAG_MAX_BOARDS 32 47#endif 48 49 50#ifndef ERF_TYPE_AAL5 51#define ERF_TYPE_AAL5 4 52#endif 53 54#ifndef ERF_TYPE_MC_HDLC 55#define ERF_TYPE_MC_HDLC 5 56#endif 57 58#ifndef ERF_TYPE_MC_RAW 59#define ERF_TYPE_MC_RAW 6 60#endif 61 62#ifndef ERF_TYPE_MC_ATM 63#define ERF_TYPE_MC_ATM 7 64#endif 65 66#ifndef ERF_TYPE_MC_RAW_CHANNEL 67#define ERF_TYPE_MC_RAW_CHANNEL 8 68#endif 69 70#ifndef ERF_TYPE_MC_AAL5 71#define ERF_TYPE_MC_AAL5 9 72#endif 73 74#ifndef ERF_TYPE_COLOR_HDLC_POS 75#define ERF_TYPE_COLOR_HDLC_POS 10 76#endif 77 78#ifndef ERF_TYPE_COLOR_ETH 79#define ERF_TYPE_COLOR_ETH 11 80#endif 81 82#ifndef ERF_TYPE_MC_AAL2 83#define ERF_TYPE_MC_AAL2 12 84#endif 85 86#ifndef ERF_TYPE_IP_COUNTER 87#define ERF_TYPE_IP_COUNTER 13 88#endif 89 90#ifndef ERF_TYPE_TCP_FLOW_COUNTER 91#define ERF_TYPE_TCP_FLOW_COUNTER 14 92#endif 93 94#ifndef ERF_TYPE_DSM_COLOR_HDLC_POS 95#define ERF_TYPE_DSM_COLOR_HDLC_POS 15 96#endif 97 98#ifndef ERF_TYPE_DSM_COLOR_ETH 99#define ERF_TYPE_DSM_COLOR_ETH 16 100#endif 101 102#ifndef ERF_TYPE_COLOR_MC_HDLC_POS 103#define ERF_TYPE_COLOR_MC_HDLC_POS 17 104#endif 105 106#ifndef ERF_TYPE_AAL2 107#define ERF_TYPE_AAL2 18 108#endif 109 110#ifndef ERF_TYPE_COLOR_HASH_POS 111#define ERF_TYPE_COLOR_HASH_POS 19 112#endif 113 114#ifndef ERF_TYPE_COLOR_HASH_ETH 115#define ERF_TYPE_COLOR_HASH_ETH 20 116#endif 117 118#ifndef ERF_TYPE_INFINIBAND 119#define ERF_TYPE_INFINIBAND 21 120#endif 121 122#ifndef ERF_TYPE_IPV4 123#define ERF_TYPE_IPV4 22 124#endif 125 126#ifndef ERF_TYPE_IPV6 127#define ERF_TYPE_IPV6 23 128#endif 129 130#ifndef ERF_TYPE_RAW_LINK 131#define ERF_TYPE_RAW_LINK 24 132#endif 133 134#ifndef ERF_TYPE_INFINIBAND_LINK 135#define ERF_TYPE_INFINIBAND_LINK 25 136#endif 137 138#ifndef ERF_TYPE_META 139#define ERF_TYPE_META 27 140#endif 141 142#ifndef ERF_TYPE_PAD 143#define ERF_TYPE_PAD 48 144#endif 145 146#define ATM_CELL_SIZE 52 147#define ATM_HDR_SIZE 4 148 149/* 150 * A header containing additional MTP information. 151 */ 152#define MTP2_SENT_OFFSET 0 /* 1 byte */ 153#define MTP2_ANNEX_A_USED_OFFSET 1 /* 1 byte */ 154#define MTP2_LINK_NUMBER_OFFSET 2 /* 2 bytes */ 155#define MTP2_HDR_LEN 4 /* length of the header */ 156 157#define MTP2_ANNEX_A_NOT_USED 0 158#define MTP2_ANNEX_A_USED 1 159#define MTP2_ANNEX_A_USED_UNKNOWN 2 160 161/* SunATM pseudo header */ 162struct sunatm_hdr { 163 unsigned char flags; /* destination and traffic type */ 164 unsigned char vpi; /* VPI */ 165 unsigned short vci; /* VCI */ 166}; 167 168/* 169 * Private data for capturing on DAG devices. 170 */ 171struct pcap_dag { 172 struct pcap_stat stat; 173 u_char *dag_mem_bottom; /* DAG card current memory bottom pointer */ 174 u_char *dag_mem_top; /* DAG card current memory top pointer */ 175 int dag_fcs_bits; /* Number of checksum bits from link layer */ 176 int dag_flags; /* Flags */ 177 int dag_stream; /* DAG stream number */ 178 int dag_timeout; /* timeout specified to pcap_open_live. 179 * Same as in linux above, introduce 180 * generally? */ 181 dag_card_ref_t dag_ref; /* DAG Configuration/Status API card reference */ 182 dag_component_t dag_root; /* DAG CSAPI Root component */ 183 attr_uuid_t drop_attr; /* DAG Stream Drop Attribute handle, if available */ 184 struct timeval required_select_timeout; 185 /* Timeout caller must use in event loops */ 186}; 187 188typedef struct pcap_dag_node { 189 struct pcap_dag_node *next; 190 pcap_t *p; 191 pid_t pid; 192} pcap_dag_node_t; 193 194static pcap_dag_node_t *pcap_dags = NULL; 195static int atexit_handler_installed = 0; 196static const unsigned short endian_test_word = 0x0100; 197 198#define IS_BIGENDIAN() (*((unsigned char *)&endian_test_word)) 199 200#define MAX_DAG_PACKET 65536 201 202static unsigned char TempPkt[MAX_DAG_PACKET]; 203 204#ifndef HAVE_DAG_LARGE_STREAMS_API 205#define dag_attach_stream64(a, b, c, d) dag_attach_stream(a, b, c, d) 206#define dag_get_stream_poll64(a, b, c, d, e) dag_get_stream_poll(a, b, c, d, e) 207#define dag_set_stream_poll64(a, b, c, d, e) dag_set_stream_poll(a, b, c, d, e) 208#define dag_size_t uint32_t 209#endif 210 211static int dag_setfilter(pcap_t *p, struct bpf_program *fp); 212static int dag_stats(pcap_t *p, struct pcap_stat *ps); 213static int dag_set_datalink(pcap_t *p, int dlt); 214static int dag_get_datalink(pcap_t *p); 215static int dag_setnonblock(pcap_t *p, int nonblock); 216 217static void 218delete_pcap_dag(pcap_t *p) 219{ 220 pcap_dag_node_t *curr = NULL, *prev = NULL; 221 222 for (prev = NULL, curr = pcap_dags; curr != NULL && curr->p != p; prev = curr, curr = curr->next) { 223 /* empty */ 224 } 225 226 if (curr != NULL && curr->p == p) { 227 if (prev != NULL) { 228 prev->next = curr->next; 229 } else { 230 pcap_dags = curr->next; 231 } 232 } 233} 234 235/* 236 * Performs a graceful shutdown of the DAG card, frees dynamic memory held 237 * in the pcap_t structure, and closes the file descriptor for the DAG card. 238 */ 239 240static void 241dag_platform_cleanup(pcap_t *p) 242{ 243 struct pcap_dag *pd = p->priv; 244 245 if(dag_stop_stream(p->fd, pd->dag_stream) < 0) 246 fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno)); 247 248 if(dag_detach_stream(p->fd, pd->dag_stream) < 0) 249 fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno)); 250 251 if(pd->dag_ref != NULL) { 252 dag_config_dispose(pd->dag_ref); 253 /* 254 * Note: we don't need to call close(p->fd) or 255 * dag_close(p->fd), as dag_config_dispose(pd->dag_ref) 256 * does this. 257 * 258 * Set p->fd to -1 to make sure that's not done. 259 */ 260 p->fd = -1; 261 pd->dag_ref = NULL; 262 } 263 delete_pcap_dag(p); 264 pcap_cleanup_live_common(p); 265} 266 267static void 268atexit_handler(void) 269{ 270 while (pcap_dags != NULL) { 271 if (pcap_dags->pid == getpid()) { 272 if (pcap_dags->p != NULL) 273 dag_platform_cleanup(pcap_dags->p); 274 } else { 275 delete_pcap_dag(pcap_dags->p); 276 } 277 } 278} 279 280static int 281new_pcap_dag(pcap_t *p) 282{ 283 pcap_dag_node_t *node = NULL; 284 285 if ((node = malloc(sizeof(pcap_dag_node_t))) == NULL) { 286 return -1; 287 } 288 289 if (!atexit_handler_installed) { 290 atexit(atexit_handler); 291 atexit_handler_installed = 1; 292 } 293 294 node->next = pcap_dags; 295 node->p = p; 296 node->pid = getpid(); 297 298 pcap_dags = node; 299 300 return 0; 301} 302 303static unsigned int 304dag_erf_ext_header_count(uint8_t * erf, size_t len) 305{ 306 uint32_t hdr_num = 0; 307 uint8_t hdr_type; 308 309 /* basic sanity checks */ 310 if ( erf == NULL ) 311 return 0; 312 if ( len < 16 ) 313 return 0; 314 315 /* check if we have any extension headers */ 316 if ( (erf[8] & 0x80) == 0x00 ) 317 return 0; 318 319 /* loop over the extension headers */ 320 do { 321 322 /* sanity check we have enough bytes */ 323 if ( len < (24 + (hdr_num * 8)) ) 324 return hdr_num; 325 326 /* get the header type */ 327 hdr_type = erf[(16 + (hdr_num * 8))]; 328 hdr_num++; 329 330 } while ( hdr_type & 0x80 ); 331 332 return hdr_num; 333} 334 335/* 336 * Read at most max_packets from the capture stream and call the callback 337 * for each of them. Returns the number of packets handled, -1 if an 338 * error occured, or -2 if we were told to break out of the loop. 339 */ 340static int 341dag_read(pcap_t *p, int cnt, pcap_handler callback, u_char *user) 342{ 343 struct pcap_dag *pd = p->priv; 344 unsigned int processed = 0; 345 unsigned int nonblocking = pd->dag_flags & DAGF_NONBLOCK; 346 unsigned int num_ext_hdr = 0; 347 unsigned int ticks_per_second; 348 349 /* Get the next bufferful of packets (if necessary). */ 350 while (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size) { 351 352 /* 353 * Has "pcap_breakloop()" been called? 354 */ 355 if (p->break_loop) { 356 /* 357 * Yes - clear the flag that indicates that 358 * it has, and return -2 to indicate that 359 * we were told to break out of the loop. 360 */ 361 p->break_loop = 0; 362 return -2; 363 } 364 365 /* dag_advance_stream() will block (unless nonblock is called) 366 * until 64kB of data has accumulated. 367 * If to_ms is set, it will timeout before 64kB has accumulated. 368 * We wait for 64kB because processing a few packets at a time 369 * can cause problems at high packet rates (>200kpps) due 370 * to inefficiencies. 371 * This does mean if to_ms is not specified the capture may 'hang' 372 * for long periods if the data rate is extremely slow (<64kB/sec) 373 * If non-block is specified it will return immediately. The user 374 * is then responsible for efficiency. 375 */ 376 if ( NULL == (pd->dag_mem_top = dag_advance_stream(p->fd, pd->dag_stream, &(pd->dag_mem_bottom))) ) { 377 return -1; 378 } 379 380 if (nonblocking && (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size)) 381 { 382 /* Pcap is configured to process only available packets, and there aren't any, return immediately. */ 383 return 0; 384 } 385 386 if(!nonblocking && 387 pd->dag_timeout && 388 (pd->dag_mem_top - pd->dag_mem_bottom < dag_record_size)) 389 { 390 /* Blocking mode, but timeout set and no data has arrived, return anyway.*/ 391 return 0; 392 } 393 394 } 395 396 /* Process the packets. */ 397 while (pd->dag_mem_top - pd->dag_mem_bottom >= dag_record_size) { 398 399 unsigned short packet_len = 0; 400 int caplen = 0; 401 struct pcap_pkthdr pcap_header; 402 403 dag_record_t *header = (dag_record_t *)(pd->dag_mem_bottom); 404 405 u_char *dp = ((u_char *)header); /* + dag_record_size; */ 406 unsigned short rlen; 407 408 /* 409 * Has "pcap_breakloop()" been called? 410 */ 411 if (p->break_loop) { 412 /* 413 * Yes - clear the flag that indicates that 414 * it has, and return -2 to indicate that 415 * we were told to break out of the loop. 416 */ 417 p->break_loop = 0; 418 return -2; 419 } 420 421 rlen = ntohs(header->rlen); 422 if (rlen < dag_record_size) 423 { 424 strncpy(p->errbuf, "dag_read: record too small", PCAP_ERRBUF_SIZE); 425 return -1; 426 } 427 pd->dag_mem_bottom += rlen; 428 429 /* Count lost packets. */ 430 switch((header->type & 0x7f)) { 431 /* in these types the color value overwrites the lctr */ 432 case ERF_TYPE_COLOR_HDLC_POS: 433 case ERF_TYPE_COLOR_ETH: 434 case ERF_TYPE_DSM_COLOR_HDLC_POS: 435 case ERF_TYPE_DSM_COLOR_ETH: 436 case ERF_TYPE_COLOR_MC_HDLC_POS: 437 case ERF_TYPE_COLOR_HASH_ETH: 438 case ERF_TYPE_COLOR_HASH_POS: 439 break; 440 441 default: 442 if ( (pd->drop_attr == kNullAttributeUuid) && (header->lctr) ) { 443 pd->stat.ps_drop += ntohs(header->lctr); 444 } 445 } 446 447 if ((header->type & 0x7f) == ERF_TYPE_PAD) { 448 continue; 449 } 450 451 num_ext_hdr = dag_erf_ext_header_count(dp, rlen); 452 453 /* ERF encapsulation */ 454 /* The Extensible Record Format is not dropped for this kind of encapsulation, 455 * and will be handled as a pseudo header by the decoding application. 456 * The information carried in the ERF header and in the optional subheader (if present) 457 * could be merged with the libpcap information, to offer a better decoding. 458 * The packet length is 459 * o the length of the packet on the link (header->wlen), 460 * o plus the length of the ERF header (dag_record_size), as the length of the 461 * pseudo header will be adjusted during the decoding, 462 * o plus the length of the optional subheader (if present). 463 * 464 * The capture length is header.rlen and the byte stuffing for alignment will be dropped 465 * if the capture length is greater than the packet length. 466 */ 467 if (p->linktype == DLT_ERF) { 468 packet_len = ntohs(header->wlen) + dag_record_size; 469 caplen = rlen; 470 switch ((header->type & 0x7f)) { 471 case ERF_TYPE_MC_AAL5: 472 case ERF_TYPE_MC_ATM: 473 case ERF_TYPE_MC_HDLC: 474 case ERF_TYPE_MC_RAW_CHANNEL: 475 case ERF_TYPE_MC_RAW: 476 case ERF_TYPE_MC_AAL2: 477 case ERF_TYPE_COLOR_MC_HDLC_POS: 478 packet_len += 4; /* MC header */ 479 break; 480 481 case ERF_TYPE_COLOR_HASH_ETH: 482 case ERF_TYPE_DSM_COLOR_ETH: 483 case ERF_TYPE_COLOR_ETH: 484 case ERF_TYPE_ETH: 485 packet_len += 2; /* ETH header */ 486 break; 487 } /* switch type */ 488 489 /* Include ERF extension headers */ 490 packet_len += (8 * num_ext_hdr); 491 492 if (caplen > packet_len) { 493 caplen = packet_len; 494 } 495 } else { 496 /* Other kind of encapsulation according to the header Type */ 497 498 /* Skip over generic ERF header */ 499 dp += dag_record_size; 500 /* Skip over extension headers */ 501 dp += 8 * num_ext_hdr; 502 503 switch((header->type & 0x7f)) { 504 case ERF_TYPE_ATM: 505 case ERF_TYPE_AAL5: 506 if ((header->type & 0x7f) == ERF_TYPE_AAL5) { 507 packet_len = ntohs(header->wlen); 508 caplen = rlen - dag_record_size; 509 } 510 case ERF_TYPE_MC_ATM: 511 if ((header->type & 0x7f) == ERF_TYPE_MC_ATM) { 512 caplen = packet_len = ATM_CELL_SIZE; 513 dp+=4; 514 } 515 case ERF_TYPE_MC_AAL5: 516 if ((header->type & 0x7f) == ERF_TYPE_MC_AAL5) { 517 packet_len = ntohs(header->wlen); 518 caplen = rlen - dag_record_size - 4; 519 dp+=4; 520 } 521 /* Skip over extension headers */ 522 caplen -= (8 * num_ext_hdr); 523 524 if ((header->type & 0x7f) == ERF_TYPE_ATM) { 525 caplen = packet_len = ATM_CELL_SIZE; 526 } 527 if (p->linktype == DLT_SUNATM) { 528 struct sunatm_hdr *sunatm = (struct sunatm_hdr *)dp; 529 unsigned long rawatm; 530 531 rawatm = ntohl(*((unsigned long *)dp)); 532 sunatm->vci = htons((rawatm >> 4) & 0xffff); 533 sunatm->vpi = (rawatm >> 20) & 0x00ff; 534 sunatm->flags = ((header->flags.iface & 1) ? 0x80 : 0x00) | 535 ((sunatm->vpi == 0 && sunatm->vci == htons(5)) ? 6 : 536 ((sunatm->vpi == 0 && sunatm->vci == htons(16)) ? 5 : 537 ((dp[ATM_HDR_SIZE] == 0xaa && 538 dp[ATM_HDR_SIZE+1] == 0xaa && 539 dp[ATM_HDR_SIZE+2] == 0x03) ? 2 : 1))); 540 541 } else if (p->linktype == DLT_ATM_RFC1483) { 542 packet_len -= ATM_HDR_SIZE; 543 caplen -= ATM_HDR_SIZE; 544 dp += ATM_HDR_SIZE; 545 } else 546 continue; 547 break; 548 549 case ERF_TYPE_COLOR_HASH_ETH: 550 case ERF_TYPE_DSM_COLOR_ETH: 551 case ERF_TYPE_COLOR_ETH: 552 case ERF_TYPE_ETH: 553 if ((p->linktype != DLT_EN10MB) && 554 (p->linktype != DLT_DOCSIS)) 555 continue; 556 packet_len = ntohs(header->wlen); 557 packet_len -= (pd->dag_fcs_bits >> 3); 558 caplen = rlen - dag_record_size - 2; 559 /* Skip over extension headers */ 560 caplen -= (8 * num_ext_hdr); 561 if (caplen > packet_len) { 562 caplen = packet_len; 563 } 564 dp += 2; 565 break; 566 567 case ERF_TYPE_COLOR_HASH_POS: 568 case ERF_TYPE_DSM_COLOR_HDLC_POS: 569 case ERF_TYPE_COLOR_HDLC_POS: 570 case ERF_TYPE_HDLC_POS: 571 if ((p->linktype != DLT_CHDLC) && 572 (p->linktype != DLT_PPP_SERIAL) && 573 (p->linktype != DLT_FRELAY)) 574 continue; 575 packet_len = ntohs(header->wlen); 576 packet_len -= (pd->dag_fcs_bits >> 3); 577 caplen = rlen - dag_record_size; 578 /* Skip over extension headers */ 579 caplen -= (8 * num_ext_hdr); 580 if (caplen > packet_len) { 581 caplen = packet_len; 582 } 583 break; 584 585 case ERF_TYPE_COLOR_MC_HDLC_POS: 586 case ERF_TYPE_MC_HDLC: 587 if ((p->linktype != DLT_CHDLC) && 588 (p->linktype != DLT_PPP_SERIAL) && 589 (p->linktype != DLT_FRELAY) && 590 (p->linktype != DLT_MTP2) && 591 (p->linktype != DLT_MTP2_WITH_PHDR) && 592 (p->linktype != DLT_LAPD)) 593 continue; 594 packet_len = ntohs(header->wlen); 595 packet_len -= (pd->dag_fcs_bits >> 3); 596 caplen = rlen - dag_record_size - 4; 597 /* Skip over extension headers */ 598 caplen -= (8 * num_ext_hdr); 599 if (caplen > packet_len) { 600 caplen = packet_len; 601 } 602 /* jump the MC_HDLC_HEADER */ 603 dp += 4; 604#ifdef DLT_MTP2_WITH_PHDR 605 if (p->linktype == DLT_MTP2_WITH_PHDR) { 606 /* Add the MTP2 Pseudo Header */ 607 caplen += MTP2_HDR_LEN; 608 packet_len += MTP2_HDR_LEN; 609 610 TempPkt[MTP2_SENT_OFFSET] = 0; 611 TempPkt[MTP2_ANNEX_A_USED_OFFSET] = MTP2_ANNEX_A_USED_UNKNOWN; 612 *(TempPkt+MTP2_LINK_NUMBER_OFFSET) = ((header->rec.mc_hdlc.mc_header>>16)&0x01); 613 *(TempPkt+MTP2_LINK_NUMBER_OFFSET+1) = ((header->rec.mc_hdlc.mc_header>>24)&0xff); 614 memcpy(TempPkt+MTP2_HDR_LEN, dp, caplen); 615 dp = TempPkt; 616 } 617#endif 618 break; 619 620 case ERF_TYPE_IPV4: 621 if ((p->linktype != DLT_RAW) && 622 (p->linktype != DLT_IPV4)) 623 continue; 624 packet_len = ntohs(header->wlen); 625 caplen = rlen - dag_record_size; 626 /* Skip over extension headers */ 627 caplen -= (8 * num_ext_hdr); 628 if (caplen > packet_len) { 629 caplen = packet_len; 630 } 631 break; 632 633 case ERF_TYPE_IPV6: 634 if ((p->linktype != DLT_RAW) && 635 (p->linktype != DLT_IPV6)) 636 continue; 637 packet_len = ntohs(header->wlen); 638 caplen = rlen - dag_record_size; 639 /* Skip over extension headers */ 640 caplen -= (8 * num_ext_hdr); 641 if (caplen > packet_len) { 642 caplen = packet_len; 643 } 644 break; 645 646 /* These types have no matching 'native' DLT, but can be used with DLT_ERF above */ 647 case ERF_TYPE_MC_RAW: 648 case ERF_TYPE_MC_RAW_CHANNEL: 649 case ERF_TYPE_IP_COUNTER: 650 case ERF_TYPE_TCP_FLOW_COUNTER: 651 case ERF_TYPE_INFINIBAND: 652 case ERF_TYPE_RAW_LINK: 653 case ERF_TYPE_INFINIBAND_LINK: 654 default: 655 /* Unhandled ERF type. 656 * Ignore rather than generating error 657 */ 658 continue; 659 } /* switch type */ 660 661 } /* ERF encapsulation */ 662 663 if (caplen > p->snapshot) 664 caplen = p->snapshot; 665 666 /* Run the packet filter if there is one. */ 667 if ((p->fcode.bf_insns == NULL) || bpf_filter(p->fcode.bf_insns, dp, packet_len, caplen)) { 668 669 /* convert between timestamp formats */ 670 register unsigned long long ts; 671 672 if (IS_BIGENDIAN()) { 673 ts = SWAPLL(header->ts); 674 } else { 675 ts = header->ts; 676 } 677 678 switch (p->opt.tstamp_precision) { 679 case PCAP_TSTAMP_PRECISION_NANO: 680 ticks_per_second = 1000000000; 681 break; 682 case PCAP_TSTAMP_PRECISION_MICRO: 683 default: 684 ticks_per_second = 1000000; 685 break; 686 687 } 688 pcap_header.ts.tv_sec = ts >> 32; 689 ts = (ts & 0xffffffffULL) * ticks_per_second; 690 ts += 0x80000000; /* rounding */ 691 pcap_header.ts.tv_usec = ts >> 32; 692 if (pcap_header.ts.tv_usec >= ticks_per_second) { 693 pcap_header.ts.tv_usec -= ticks_per_second; 694 pcap_header.ts.tv_sec++; 695 } 696 697 /* Fill in our own header data */ 698 pcap_header.caplen = caplen; 699 pcap_header.len = packet_len; 700 701 /* Count the packet. */ 702 pd->stat.ps_recv++; 703 704 /* Call the user supplied callback function */ 705 callback(user, &pcap_header, dp); 706 707 /* Only count packets that pass the filter, for consistency with standard Linux behaviour. */ 708 processed++; 709 if (processed == cnt && !PACKET_COUNT_IS_UNLIMITED(cnt)) 710 { 711 /* Reached the user-specified limit. */ 712 return cnt; 713 } 714 } 715 } 716 717 return processed; 718} 719 720static int 721dag_inject(pcap_t *p, const void *buf _U_, size_t size _U_) 722{ 723 pcap_strlcpy(p->errbuf, "Sending packets isn't supported on DAG cards", 724 PCAP_ERRBUF_SIZE); 725 return (-1); 726} 727 728/* 729 * Get a handle for a live capture from the given DAG device. Passing a NULL 730 * device will result in a failure. The promisc flag is ignored because DAG 731 * cards are always promiscuous. The to_ms parameter is used in setting the 732 * API polling parameters. 733 * 734 * snaplen is now also ignored, until we get per-stream slen support. Set 735 * slen with approprite DAG tool BEFORE pcap_activate(). 736 * 737 * See also pcap(3). 738 */ 739static int dag_activate(pcap_t* p) 740{ 741 struct pcap_dag *pd = p->priv; 742 char *s; 743 int n; 744 daginf_t* daginf; 745 char * newDev = NULL; 746 char * device = p->opt.device; 747 int ret; 748 dag_size_t mindata; 749 struct timeval maxwait; 750 struct timeval poll; 751 752 if (device == NULL) { 753 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "device is NULL"); 754 return PCAP_ERROR; 755 } 756 757 /* Initialize some components of the pcap structure. */ 758 newDev = (char *)malloc(strlen(device) + 16); 759 if (newDev == NULL) { 760 ret = PCAP_ERROR; 761 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 762 errno, "Can't allocate string for device name"); 763 goto fail; 764 } 765 766 /* Parse input name to get dag device and stream number if provided */ 767 if (dag_parse_name(device, newDev, strlen(device) + 16, &pd->dag_stream) < 0) { 768 /* 769 * XXX - it'd be nice if this indicated what was wrong 770 * with the name. Does this reliably set errno? 771 * Should this return PCAP_ERROR_NO_SUCH_DEVICE in some 772 * cases? 773 */ 774 ret = PCAP_ERROR; 775 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 776 errno, "dag_parse_name"); 777 goto fail; 778 } 779 device = newDev; 780 781 if (pd->dag_stream%2) { 782 ret = PCAP_ERROR; 783 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "dag_parse_name: tx (even numbered) streams not supported for capture"); 784 goto fail; 785 } 786 787 /* setup device parameters */ 788 if((pd->dag_ref = dag_config_init((char *)device)) == NULL) { 789 /* 790 * XXX - does this reliably set errno? 791 */ 792 if (errno == ENOENT) 793 ret = PCAP_ERROR_NO_SUCH_DEVICE; 794 else if (errno == EPERM || errno == EACCES) 795 ret = PCAP_ERROR_PERM_DENIED; 796 else 797 ret = PCAP_ERROR; 798 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 799 errno, "dag_config_init %s", device); 800 goto fail; 801 } 802 803 if((p->fd = dag_config_get_card_fd(pd->dag_ref)) < 0) { 804 /* 805 * XXX - does this reliably set errno? 806 */ 807 ret = PCAP_ERROR; 808 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 809 errno, "dag_config_get_card_fd %s", device); 810 goto failclose; 811 } 812 813 /* Open requested stream. Can fail if already locked or on error */ 814 if (dag_attach_stream64(p->fd, pd->dag_stream, 0, 0) < 0) { 815 ret = PCAP_ERROR; 816 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 817 errno, "dag_attach_stream"); 818 goto failclose; 819 } 820 821 /* Try to find Stream Drop attribute */ 822 pd->drop_attr = kNullAttributeUuid; 823 pd->dag_root = dag_config_get_root_component(pd->dag_ref); 824 if ( dag_component_get_subcomponent(pd->dag_root, kComponentStreamFeatures, 0) ) 825 { 826 pd->drop_attr = dag_config_get_indexed_attribute_uuid(pd->dag_ref, kUint32AttributeStreamDropCount, pd->dag_stream/2); 827 } 828 829 /* Set up default poll parameters for stream 830 * Can be overridden by pcap_set_nonblock() 831 */ 832 if (dag_get_stream_poll64(p->fd, pd->dag_stream, 833 &mindata, &maxwait, &poll) < 0) { 834 ret = PCAP_ERROR; 835 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 836 errno, "dag_get_stream_poll"); 837 goto faildetach; 838 } 839 840 /* Use the poll time as the required select timeout for callers 841 * who are using select()/etc. in an event loop waiting for 842 * packets to arrive. 843 */ 844 pd->required_select_timeout = poll; 845 p->required_select_timeout = &pd->required_select_timeout; 846 847 /* 848 * Turn a negative snapshot value (invalid), a snapshot value of 849 * 0 (unspecified), or a value bigger than the normal maximum 850 * value, into the maximum allowed value. 851 * 852 * If some application really *needs* a bigger snapshot 853 * length, we should just increase MAXIMUM_SNAPLEN. 854 */ 855 if (p->snapshot <= 0 || p->snapshot > MAXIMUM_SNAPLEN) 856 p->snapshot = MAXIMUM_SNAPLEN; 857 858 if (p->opt.immediate) { 859 /* Call callback immediately. 860 * XXX - is this the right way to p this? 861 */ 862 mindata = 0; 863 } else { 864 /* Amount of data to collect in Bytes before calling callbacks. 865 * Important for efficiency, but can introduce latency 866 * at low packet rates if to_ms not set! 867 */ 868 mindata = 65536; 869 } 870 871 /* Obey opt.timeout (was to_ms) if supplied. This is a good idea! 872 * Recommend 10-100ms. Calls will time out even if no data arrived. 873 */ 874 maxwait.tv_sec = p->opt.timeout/1000; 875 maxwait.tv_usec = (p->opt.timeout%1000) * 1000; 876 877 if (dag_set_stream_poll64(p->fd, pd->dag_stream, 878 mindata, &maxwait, &poll) < 0) { 879 ret = PCAP_ERROR; 880 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 881 errno, "dag_set_stream_poll"); 882 goto faildetach; 883 } 884 885 /* XXX Not calling dag_configure() to set slen; this is unsafe in 886 * multi-stream environments as the gpp config is global. 887 * Once the firmware provides 'per-stream slen' this can be supported 888 * again via the Config API without side-effects */ 889#if 0 890 /* set the card snap length to the specified snaplen parameter */ 891 /* This is a really bad idea, as different cards have different 892 * valid slen ranges. Should fix in Config API. */ 893 if (p->snapshot == 0 || p->snapshot > MAX_DAG_SNAPLEN) { 894 p->snapshot = MAX_DAG_SNAPLEN; 895 } else if (snaplen < MIN_DAG_SNAPLEN) { 896 p->snapshot = MIN_DAG_SNAPLEN; 897 } 898 /* snap len has to be a multiple of 4 */ 899#endif 900 901 if(dag_start_stream(p->fd, pd->dag_stream) < 0) { 902 ret = PCAP_ERROR; 903 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 904 errno, "dag_start_stream %s", device); 905 goto faildetach; 906 } 907 908 /* 909 * Important! You have to ensure bottom is properly 910 * initialized to zero on startup, it won't give you 911 * a compiler warning if you make this mistake! 912 */ 913 pd->dag_mem_bottom = 0; 914 pd->dag_mem_top = 0; 915 916 /* 917 * Find out how many FCS bits we should strip. 918 * First, query the card to see if it strips the FCS. 919 */ 920 daginf = dag_info(p->fd); 921 if ((0x4200 == daginf->device_code) || (0x4230 == daginf->device_code)) { 922 /* DAG 4.2S and 4.23S already strip the FCS. Stripping the final word again truncates the packet. */ 923 pd->dag_fcs_bits = 0; 924 925 /* Note that no FCS will be supplied. */ 926 p->linktype_ext = LT_FCS_DATALINK_EXT(0); 927 } else { 928 /* 929 * Start out assuming it's 32 bits. 930 */ 931 pd->dag_fcs_bits = 32; 932 933 /* Allow an environment variable to override. */ 934 if ((s = getenv("ERF_FCS_BITS")) != NULL) { 935 if ((n = atoi(s)) == 0 || n == 16 || n == 32) { 936 pd->dag_fcs_bits = n; 937 } else { 938 ret = PCAP_ERROR; 939 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, 940 "pcap_activate %s: bad ERF_FCS_BITS value (%d) in environment", device, n); 941 goto failstop; 942 } 943 } 944 945 /* 946 * Did the user request that they not be stripped? 947 */ 948 if ((s = getenv("ERF_DONT_STRIP_FCS")) != NULL) { 949 /* Yes. Note the number of bytes that will be 950 supplied. */ 951 p->linktype_ext = LT_FCS_DATALINK_EXT(pd->dag_fcs_bits/16); 952 953 /* And don't strip them. */ 954 pd->dag_fcs_bits = 0; 955 } 956 } 957 958 pd->dag_timeout = p->opt.timeout; 959 960 p->linktype = -1; 961 if (dag_get_datalink(p) < 0) { 962 ret = PCAP_ERROR; 963 goto failstop; 964 } 965 966 p->bufsize = 0; 967 968 if (new_pcap_dag(p) < 0) { 969 ret = PCAP_ERROR; 970 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 971 errno, "new_pcap_dag %s", device); 972 goto failstop; 973 } 974 975 /* 976 * "select()" and "poll()" don't work on DAG device descriptors. 977 */ 978 p->selectable_fd = -1; 979 980 if (newDev != NULL) { 981 free((char *)newDev); 982 } 983 984 p->read_op = dag_read; 985 p->inject_op = dag_inject; 986 p->setfilter_op = dag_setfilter; 987 p->setdirection_op = NULL; /* Not implemented.*/ 988 p->set_datalink_op = dag_set_datalink; 989 p->getnonblock_op = pcap_getnonblock_fd; 990 p->setnonblock_op = dag_setnonblock; 991 p->stats_op = dag_stats; 992 p->cleanup_op = dag_platform_cleanup; 993 pd->stat.ps_drop = 0; 994 pd->stat.ps_recv = 0; 995 pd->stat.ps_ifdrop = 0; 996 return 0; 997 998failstop: 999 if (dag_stop_stream(p->fd, pd->dag_stream) < 0) { 1000 fprintf(stderr,"dag_stop_stream: %s\n", strerror(errno)); 1001 } 1002 1003faildetach: 1004 if (dag_detach_stream(p->fd, pd->dag_stream) < 0) 1005 fprintf(stderr,"dag_detach_stream: %s\n", strerror(errno)); 1006 1007failclose: 1008 dag_config_dispose(pd->dag_ref); 1009 /* 1010 * Note: we don't need to call close(p->fd) or dag_close(p->fd), 1011 * as dag_config_dispose(pd->dag_ref) does this. 1012 * 1013 * Set p->fd to -1 to make sure that's not done. 1014 */ 1015 p->fd = -1; 1016 pd->dag_ref = NULL; 1017 delete_pcap_dag(p); 1018 1019fail: 1020 pcap_cleanup_live_common(p); 1021 if (newDev != NULL) { 1022 free((char *)newDev); 1023 } 1024 1025 return ret; 1026} 1027 1028pcap_t *dag_create(const char *device, char *ebuf, int *is_ours) 1029{ 1030 const char *cp; 1031 char *cpend; 1032 long devnum; 1033 pcap_t *p; 1034 long stream = 0; 1035 1036 /* Does this look like a DAG device? */ 1037 cp = strrchr(device, '/'); 1038 if (cp == NULL) 1039 cp = device; 1040 /* Does it begin with "dag"? */ 1041 if (strncmp(cp, "dag", 3) != 0) { 1042 /* Nope, doesn't begin with "dag" */ 1043 *is_ours = 0; 1044 return NULL; 1045 } 1046 /* Yes - is "dag" followed by a number from 0 to DAG_MAX_BOARDS-1 */ 1047 cp += 3; 1048 devnum = strtol(cp, &cpend, 10); 1049 if (*cpend == ':') { 1050 /* Followed by a stream number. */ 1051 stream = strtol(++cpend, &cpend, 10); 1052 } 1053 1054 if (cpend == cp || *cpend != '\0') { 1055 /* Not followed by a number. */ 1056 *is_ours = 0; 1057 return NULL; 1058 } 1059 1060 if (devnum < 0 || devnum >= DAG_MAX_BOARDS) { 1061 /* Followed by a non-valid number. */ 1062 *is_ours = 0; 1063 return NULL; 1064 } 1065 1066 if (stream <0 || stream >= DAG_STREAM_MAX) { 1067 /* Followed by a non-valid stream number. */ 1068 *is_ours = 0; 1069 return NULL; 1070 } 1071 1072 /* OK, it's probably ours. */ 1073 *is_ours = 1; 1074 1075 p = pcap_create_common(ebuf, sizeof (struct pcap_dag)); 1076 if (p == NULL) 1077 return NULL; 1078 1079 p->activate_op = dag_activate; 1080 1081 /* 1082 * We claim that we support microsecond and nanosecond time 1083 * stamps. 1084 * 1085 * XXX Our native precision is 2^-32s, but libpcap doesn't support 1086 * power of two precisions yet. We can convert to either MICRO or NANO. 1087 */ 1088 p->tstamp_precision_count = 2; 1089 p->tstamp_precision_list = malloc(2 * sizeof(u_int)); 1090 if (p->tstamp_precision_list == NULL) { 1091 pcap_fmt_errmsg_for_errno(ebuf, PCAP_ERRBUF_SIZE, 1092 errno, "malloc"); 1093 pcap_close(p); 1094 return NULL; 1095 } 1096 p->tstamp_precision_list[0] = PCAP_TSTAMP_PRECISION_MICRO; 1097 p->tstamp_precision_list[1] = PCAP_TSTAMP_PRECISION_NANO; 1098 return p; 1099} 1100 1101static int 1102dag_stats(pcap_t *p, struct pcap_stat *ps) { 1103 struct pcap_dag *pd = p->priv; 1104 uint32_t stream_drop; 1105 dag_err_t dag_error; 1106 1107 /* 1108 * Packet records received (ps_recv) are counted in dag_read(). 1109 * Packet records dropped (ps_drop) are read from Stream Drop attribute if present, 1110 * otherwise integrate the ERF Header lctr counts (if available) in dag_read(). 1111 * We are reporting that no records are dropped by the card/driver (ps_ifdrop). 1112 */ 1113 1114 if(pd->drop_attr != kNullAttributeUuid) { 1115 /* Note this counter is cleared at start of capture and will wrap at UINT_MAX. 1116 * The application is responsible for polling ps_drop frequently enough 1117 * to detect each wrap and integrate total drop with a wider counter */ 1118 if ((dag_error = dag_config_get_uint32_attribute_ex(pd->dag_ref, pd->drop_attr, &stream_drop) == kDagErrNone)) { 1119 pd->stat.ps_drop = stream_drop; 1120 } else { 1121 pcap_snprintf(p->errbuf, PCAP_ERRBUF_SIZE, "reading stream drop attribute: %s", 1122 dag_config_strerror(dag_error)); 1123 return -1; 1124 } 1125 } 1126 1127 *ps = pd->stat; 1128 1129 return 0; 1130} 1131 1132/* 1133 * Add all DAG devices. 1134 */ 1135int 1136dag_findalldevs(pcap_if_list_t *devlistp, char *errbuf) 1137{ 1138 char name[12]; /* XXX - pick a size */ 1139 int c; 1140 char dagname[DAGNAME_BUFSIZE]; 1141 int dagstream; 1142 int dagfd; 1143 dag_card_inf_t *inf; 1144 char *description; 1145 int stream, rxstreams; 1146 1147 /* Try all the DAGs 0-DAG_MAX_BOARDS */ 1148 for (c = 0; c < DAG_MAX_BOARDS; c++) { 1149 pcap_snprintf(name, 12, "dag%d", c); 1150 if (-1 == dag_parse_name(name, dagname, DAGNAME_BUFSIZE, &dagstream)) 1151 { 1152 (void) pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1153 "dag: device name %s can't be parsed", name); 1154 return (-1); 1155 } 1156 if ( (dagfd = dag_open(dagname)) >= 0 ) { 1157 description = NULL; 1158 if ((inf = dag_pciinfo(dagfd))) 1159 description = dag_device_name(inf->device_code, 1); 1160 /* 1161 * XXX - is there a way to determine whether 1162 * the card is plugged into a network or not? 1163 * If so, we should check that and set 1164 * PCAP_IF_CONNECTION_STATUS_CONNECTED or 1165 * PCAP_IF_CONNECTION_STATUS_DISCONNECTED. 1166 * 1167 * Also, are there notions of "up" and "running"? 1168 */ 1169 if (add_dev(devlistp, name, 0, description, errbuf) == NULL) { 1170 /* 1171 * Failure. 1172 */ 1173 return (-1); 1174 } 1175 rxstreams = dag_rx_get_stream_count(dagfd); 1176 for(stream=0;stream<DAG_STREAM_MAX;stream+=2) { 1177 if (0 == dag_attach_stream64(dagfd, stream, 0, 0)) { 1178 dag_detach_stream(dagfd, stream); 1179 1180 pcap_snprintf(name, 10, "dag%d:%d", c, stream); 1181 if (add_dev(devlistp, name, 0, description, errbuf) == NULL) { 1182 /* 1183 * Failure. 1184 */ 1185 return (-1); 1186 } 1187 1188 rxstreams--; 1189 if(rxstreams <= 0) { 1190 break; 1191 } 1192 } 1193 } 1194 dag_close(dagfd); 1195 } 1196 1197 } 1198 return (0); 1199} 1200 1201/* 1202 * Installs the given bpf filter program in the given pcap structure. There is 1203 * no attempt to store the filter in kernel memory as that is not supported 1204 * with DAG cards. 1205 */ 1206static int 1207dag_setfilter(pcap_t *p, struct bpf_program *fp) 1208{ 1209 if (!p) 1210 return -1; 1211 if (!fp) { 1212 strncpy(p->errbuf, "setfilter: No filter specified", 1213 sizeof(p->errbuf)); 1214 return -1; 1215 } 1216 1217 /* Make our private copy of the filter */ 1218 1219 if (install_bpf_program(p, fp) < 0) 1220 return -1; 1221 1222 return (0); 1223} 1224 1225static int 1226dag_set_datalink(pcap_t *p, int dlt) 1227{ 1228 p->linktype = dlt; 1229 1230 return (0); 1231} 1232 1233static int 1234dag_setnonblock(pcap_t *p, int nonblock) 1235{ 1236 struct pcap_dag *pd = p->priv; 1237 dag_size_t mindata; 1238 struct timeval maxwait; 1239 struct timeval poll; 1240 1241 /* 1242 * Set non-blocking mode on the FD. 1243 * XXX - is that necessary? If not, don't bother calling it, 1244 * and have a "dag_getnonblock()" function that looks at 1245 * "pd->dag_flags". 1246 */ 1247 if (pcap_setnonblock_fd(p, nonblock) < 0) 1248 return (-1); 1249 1250 if (dag_get_stream_poll64(p->fd, pd->dag_stream, 1251 &mindata, &maxwait, &poll) < 0) { 1252 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 1253 errno, "dag_get_stream_poll"); 1254 return -1; 1255 } 1256 1257 /* Amount of data to collect in Bytes before calling callbacks. 1258 * Important for efficiency, but can introduce latency 1259 * at low packet rates if to_ms not set! 1260 */ 1261 if(nonblock) 1262 mindata = 0; 1263 else 1264 mindata = 65536; 1265 1266 if (dag_set_stream_poll64(p->fd, pd->dag_stream, 1267 mindata, &maxwait, &poll) < 0) { 1268 pcap_fmt_errmsg_for_errno(p->errbuf, PCAP_ERRBUF_SIZE, 1269 errno, "dag_set_stream_poll"); 1270 return -1; 1271 } 1272 1273 if (nonblock) { 1274 pd->dag_flags |= DAGF_NONBLOCK; 1275 } else { 1276 pd->dag_flags &= ~DAGF_NONBLOCK; 1277 } 1278 return (0); 1279} 1280 1281static int 1282dag_get_datalink(pcap_t *p) 1283{ 1284 struct pcap_dag *pd = p->priv; 1285 int index=0, dlt_index=0; 1286 uint8_t types[255]; 1287 1288 memset(types, 0, 255); 1289 1290 if (p->dlt_list == NULL && (p->dlt_list = malloc(255*sizeof(*(p->dlt_list)))) == NULL) { 1291 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 1292 errno, "malloc"); 1293 return (-1); 1294 } 1295 1296 p->linktype = 0; 1297 1298#ifdef HAVE_DAG_GET_STREAM_ERF_TYPES 1299 /* Get list of possible ERF types for this card */ 1300 if (dag_get_stream_erf_types(p->fd, pd->dag_stream, types, 255) < 0) { 1301 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 1302 errno, "dag_get_stream_erf_types"); 1303 return (-1); 1304 } 1305 1306 while (types[index]) { 1307 1308#elif defined HAVE_DAG_GET_ERF_TYPES 1309 /* Get list of possible ERF types for this card */ 1310 if (dag_get_erf_types(p->fd, types, 255) < 0) { 1311 pcap_fmt_errmsg_for_errno(p->errbuf, sizeof(p->errbuf), 1312 errno, "dag_get_erf_types"); 1313 return (-1); 1314 } 1315 1316 while (types[index]) { 1317#else 1318 /* Check the type through a dagapi call. */ 1319 types[index] = dag_linktype(p->fd); 1320 1321 { 1322#endif 1323 switch((types[index] & 0x7f)) { 1324 1325 case ERF_TYPE_HDLC_POS: 1326 case ERF_TYPE_COLOR_HDLC_POS: 1327 case ERF_TYPE_DSM_COLOR_HDLC_POS: 1328 case ERF_TYPE_COLOR_HASH_POS: 1329 1330 if (p->dlt_list != NULL) { 1331 p->dlt_list[dlt_index++] = DLT_CHDLC; 1332 p->dlt_list[dlt_index++] = DLT_PPP_SERIAL; 1333 p->dlt_list[dlt_index++] = DLT_FRELAY; 1334 } 1335 if(!p->linktype) 1336 p->linktype = DLT_CHDLC; 1337 break; 1338 1339 case ERF_TYPE_ETH: 1340 case ERF_TYPE_COLOR_ETH: 1341 case ERF_TYPE_DSM_COLOR_ETH: 1342 case ERF_TYPE_COLOR_HASH_ETH: 1343 /* 1344 * This is (presumably) a real Ethernet capture; give it a 1345 * link-layer-type list with DLT_EN10MB and DLT_DOCSIS, so 1346 * that an application can let you choose it, in case you're 1347 * capturing DOCSIS traffic that a Cisco Cable Modem 1348 * Termination System is putting out onto an Ethernet (it 1349 * doesn't put an Ethernet header onto the wire, it puts raw 1350 * DOCSIS frames out on the wire inside the low-level 1351 * Ethernet framing). 1352 */ 1353 if (p->dlt_list != NULL) { 1354 p->dlt_list[dlt_index++] = DLT_EN10MB; 1355 p->dlt_list[dlt_index++] = DLT_DOCSIS; 1356 } 1357 if(!p->linktype) 1358 p->linktype = DLT_EN10MB; 1359 break; 1360 1361 case ERF_TYPE_ATM: 1362 case ERF_TYPE_AAL5: 1363 case ERF_TYPE_MC_ATM: 1364 case ERF_TYPE_MC_AAL5: 1365 if (p->dlt_list != NULL) { 1366 p->dlt_list[dlt_index++] = DLT_ATM_RFC1483; 1367 p->dlt_list[dlt_index++] = DLT_SUNATM; 1368 } 1369 if(!p->linktype) 1370 p->linktype = DLT_ATM_RFC1483; 1371 break; 1372 1373 case ERF_TYPE_COLOR_MC_HDLC_POS: 1374 case ERF_TYPE_MC_HDLC: 1375 if (p->dlt_list != NULL) { 1376 p->dlt_list[dlt_index++] = DLT_CHDLC; 1377 p->dlt_list[dlt_index++] = DLT_PPP_SERIAL; 1378 p->dlt_list[dlt_index++] = DLT_FRELAY; 1379 p->dlt_list[dlt_index++] = DLT_MTP2; 1380 p->dlt_list[dlt_index++] = DLT_MTP2_WITH_PHDR; 1381 p->dlt_list[dlt_index++] = DLT_LAPD; 1382 } 1383 if(!p->linktype) 1384 p->linktype = DLT_CHDLC; 1385 break; 1386 1387 case ERF_TYPE_IPV4: 1388 if (p->dlt_list != NULL) { 1389 p->dlt_list[dlt_index++] = DLT_RAW; 1390 p->dlt_list[dlt_index++] = DLT_IPV4; 1391 } 1392 if(!p->linktype) 1393 p->linktype = DLT_RAW; 1394 break; 1395 1396 case ERF_TYPE_IPV6: 1397 if (p->dlt_list != NULL) { 1398 p->dlt_list[dlt_index++] = DLT_RAW; 1399 p->dlt_list[dlt_index++] = DLT_IPV6; 1400 } 1401 if(!p->linktype) 1402 p->linktype = DLT_RAW; 1403 break; 1404 1405 case ERF_TYPE_LEGACY: 1406 case ERF_TYPE_MC_RAW: 1407 case ERF_TYPE_MC_RAW_CHANNEL: 1408 case ERF_TYPE_IP_COUNTER: 1409 case ERF_TYPE_TCP_FLOW_COUNTER: 1410 case ERF_TYPE_INFINIBAND: 1411 case ERF_TYPE_RAW_LINK: 1412 case ERF_TYPE_INFINIBAND_LINK: 1413 case ERF_TYPE_META: 1414 default: 1415 /* Libpcap cannot deal with these types yet */ 1416 /* Add no 'native' DLTs, but still covered by DLT_ERF */ 1417 break; 1418 1419 } /* switch */ 1420 index++; 1421 } 1422 1423 p->dlt_list[dlt_index++] = DLT_ERF; 1424 1425 p->dlt_count = dlt_index; 1426 1427 if(!p->linktype) 1428 p->linktype = DLT_ERF; 1429 1430 return p->linktype; 1431} 1432 1433#ifdef DAG_ONLY 1434/* 1435 * This libpcap build supports only DAG cards, not regular network 1436 * interfaces. 1437 */ 1438 1439/* 1440 * There are no regular interfaces, just DAG interfaces. 1441 */ 1442int 1443pcap_platform_finddevs(pcap_if_list_t *devlistp _U_, char *errbuf) 1444{ 1445 return (0); 1446} 1447 1448/* 1449 * Attempts to open a regular interface fail. 1450 */ 1451pcap_t * 1452pcap_create_interface(const char *device, char *errbuf) 1453{ 1454 pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, 1455 "This version of libpcap only supports DAG cards"); 1456 return NULL; 1457} 1458 1459/* 1460 * Libpcap version string. 1461 */ 1462const char * 1463pcap_lib_version(void) 1464{ 1465 return (PCAP_VERSION_STRING " (DAG-only)"); 1466} 1467#endif 1468