1/* 2 * Copyright (c) 1993, 1994, 1995, 1996, 1997 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code distributions 7 * retain the above copyright notice and this paragraph in its entirety, (2) 8 * distributions including binary code include the above copyright notice and 9 * this paragraph in its entirety in the documentation or other materials 10 * provided with the distribution, and (3) all advertising materials mentioning 11 * features or use of this software display the following acknowledgement: 12 * ``This product includes software developed by the University of California, 13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 14 * the University nor the names of its contributors may be used to endorse 15 * or promote products derived from this software without specific prior 16 * written permission. 17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 20 * 21 * pcap-common.c - common code for pcap and pcap-ng files 22 */ 23 24#ifdef HAVE_CONFIG_H 25#include "config.h" 26#endif 27 28#ifdef WIN32 29#include <pcap-stdinc.h> 30#else /* WIN32 */ 31#if HAVE_INTTYPES_H 32#include <inttypes.h> 33#elif HAVE_STDINT_H 34#include <stdint.h> 35#endif 36#ifdef HAVE_SYS_BITYPES_H 37#include <sys/bitypes.h> 38#endif 39#include <sys/types.h> 40#endif /* WIN32 */ 41 42#include "pcap-int.h" 43#include "pcap/usb.h" 44#include "pcap/nflog.h" 45 46#include "pcap-common.h" 47 48/* 49 * We don't write DLT_* values to capture files, because they're not the 50 * same on all platforms. 51 * 52 * Unfortunately, the various flavors of BSD have not always used the same 53 * numerical values for the same data types, and various patches to 54 * libpcap for non-BSD OSes have added their own DLT_* codes for link 55 * layer encapsulation types seen on those OSes, and those codes have had, 56 * in some cases, values that were also used, on other platforms, for other 57 * link layer encapsulation types. 58 * 59 * This means that capture files of a type whose numerical DLT_* code 60 * means different things on different BSDs, or with different versions 61 * of libpcap, can't always be read on systems other than those like 62 * the one running on the machine on which the capture was made. 63 * 64 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 65 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 66 * codes to DLT_* codes when reading a savefile header. 67 * 68 * For those DLT_* codes that have, as far as we know, the same values on 69 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 70 * DLT_xxx; that way, captures of those types can still be read by 71 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 72 * captures of those types written by versions of libpcap that map DLT_ 73 * values to LINKTYPE_ values can still be read by older versions 74 * of libpcap. 75 * 76 * The other LINKTYPE_* codes are given values starting at 100, in the 77 * hopes that no DLT_* code will be given one of those values. 78 * 79 * In order to ensure that a given LINKTYPE_* code's value will refer to 80 * the same encapsulation type on all platforms, you should not allocate 81 * a new LINKTYPE_* value without consulting 82 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will 83 * allocate a value for you, and will not subsequently allocate it to 84 * anybody else; that value will be added to the "pcap.h" in the 85 * tcpdump.org Git repository, so that a future libpcap release will 86 * include it. 87 * 88 * You should, if possible, also contribute patches to libpcap and tcpdump 89 * to handle the new encapsulation type, so that they can also be checked 90 * into the tcpdump.org Git repository and so that they will appear in 91 * future libpcap and tcpdump releases. 92 * 93 * Do *NOT* assume that any values after the largest value in this file 94 * are available; you might not have the most up-to-date version of this 95 * file, and new values after that one might have been assigned. Also, 96 * do *NOT* use any values below 100 - those might already have been 97 * taken by one (or more!) organizations. 98 * 99 * Any platform that defines additional DLT_* codes should: 100 * 101 * request a LINKTYPE_* code and value from tcpdump.org, 102 * as per the above; 103 * 104 * add, in their version of libpcap, an entry to map 105 * those DLT_* codes to the corresponding LINKTYPE_* 106 * code; 107 * 108 * redefine, in their "net/bpf.h", any DLT_* values 109 * that collide with the values used by their additional 110 * DLT_* codes, to remove those collisions (but without 111 * making them collide with any of the LINKTYPE_* 112 * values equal to 50 or above; they should also avoid 113 * defining DLT_* values that collide with those 114 * LINKTYPE_* values, either). 115 */ 116#define LINKTYPE_NULL DLT_NULL 117#define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 118#define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 119#define LINKTYPE_AX25 DLT_AX25 120#define LINKTYPE_PRONET DLT_PRONET 121#define LINKTYPE_CHAOS DLT_CHAOS 122#define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */ 123#define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */ 124#define LINKTYPE_SLIP DLT_SLIP 125#define LINKTYPE_PPP DLT_PPP 126#define LINKTYPE_FDDI DLT_FDDI 127 128/* 129 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 130 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 131 * field) at the beginning of the packet. 132 * 133 * This is for use when there is always such a header; the address field 134 * might be 0xff, for regular PPP, or it might be an address field for Cisco 135 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 136 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 137 * 138 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 139 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 140 * captures will be written out with a link type that NetBSD's tcpdump 141 * can read. 142 */ 143#define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 144 145#define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 146 147#define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 148 149/* 150 * These correspond to DLT_s that have different values on different 151 * platforms; we map between these values in capture files and 152 * the DLT_ values as returned by pcap_datalink() and passed to 153 * pcap_open_dead(). 154 */ 155#define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 156#define LINKTYPE_RAW 101 /* raw IP */ 157#define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 158#define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 159 160/* 161 * Values starting with 104 are used for newly-assigned link-layer 162 * header type values; for those link-layer header types, the DLT_ 163 * value returned by pcap_datalink() and passed to pcap_open_dead(), 164 * and the LINKTYPE_ value that appears in capture files, are the 165 * same. 166 * 167 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX 168 * is the highest such value. 169 */ 170#define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */ 171 172#define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 173#define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 174#define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 175#define LINKTYPE_FRELAY 107 /* Frame Relay */ 176#define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 177#define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 178 179/* 180 * These three types are reserved for future use. 181 */ 182#define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 183#define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 184#define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 185 186#define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 187#define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 188#define LINKTYPE_ECONET 115 /* Acorn Econet */ 189 190/* 191 * Reserved for use with OpenBSD ipfilter. 192 */ 193#define LINKTYPE_IPFILTER 116 194 195#define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 196#define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 197#define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */ 198#define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */ 199 200/* 201 * Reserved for Siemens HiPath HDLC. 202 */ 203#define LINKTYPE_HHDLC 121 204 205#define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 206#define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 207 208/* 209 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 210 * for private use. 211 */ 212#define LINKTYPE_RIO 124 /* RapidIO */ 213#define LINKTYPE_PCI_EXP 125 /* PCI Express */ 214#define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 215 216#define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */ 217 218/* 219 * Reserved for the TZSP encapsulation, as per request from 220 * Chris Waters <chris.waters@networkchemistry.com> 221 * TZSP is a generic encapsulation for any other link type, 222 * which includes a means to include meta-information 223 * with the packet, e.g. signal strength and channel 224 * for 802.11 packets. 225 */ 226#define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 227 228#define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 229 230/* 231 * Juniper-private data link types, as per request from 232 * Hannes Gredler <hannes@juniper.net>. The corresponding 233 * DLT_s are used for passing on chassis-internal 234 * metainformation such as QOS profiles, etc.. 235 */ 236#define LINKTYPE_JUNIPER_MLPPP 130 237#define LINKTYPE_JUNIPER_MLFR 131 238#define LINKTYPE_JUNIPER_ES 132 239#define LINKTYPE_JUNIPER_GGSN 133 240#define LINKTYPE_JUNIPER_MFR 134 241#define LINKTYPE_JUNIPER_ATM2 135 242#define LINKTYPE_JUNIPER_SERVICES 136 243#define LINKTYPE_JUNIPER_ATM1 137 244 245#define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 246 247#define LINKTYPE_MTP2_WITH_PHDR 139 248#define LINKTYPE_MTP2 140 249#define LINKTYPE_MTP3 141 250#define LINKTYPE_SCCP 142 251 252#define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 253 254#define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 255 256/* 257 * Reserved for IBM SP switch and IBM Next Federation switch. 258 */ 259#define LINKTYPE_IBM_SP 145 260#define LINKTYPE_IBM_SN 146 261 262/* 263 * Reserved for private use. If you have some link-layer header type 264 * that you want to use within your organization, with the capture files 265 * using that link-layer header type not ever be sent outside your 266 * organization, you can use these values. 267 * 268 * No libpcap release will use these for any purpose, nor will any 269 * tcpdump release use them, either. 270 * 271 * Do *NOT* use these in capture files that you expect anybody not using 272 * your private versions of capture-file-reading tools to read; in 273 * particular, do *NOT* use them in products, otherwise you may find that 274 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 275 * read capture files from your firewall/intrusion detection/traffic 276 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 277 * and you may also find that the developers of those applications will 278 * not accept patches to let them read those files. 279 * 280 * Also, do not use them if somebody might send you a capture using them 281 * for *their* private type and tools using them for *your* private type 282 * would have to read them. 283 * 284 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a 285 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use 286 * the type you're given. 287 */ 288#define LINKTYPE_USER0 147 289#define LINKTYPE_USER1 148 290#define LINKTYPE_USER2 149 291#define LINKTYPE_USER3 150 292#define LINKTYPE_USER4 151 293#define LINKTYPE_USER5 152 294#define LINKTYPE_USER6 153 295#define LINKTYPE_USER7 154 296#define LINKTYPE_USER8 155 297#define LINKTYPE_USER9 156 298#define LINKTYPE_USER10 157 299#define LINKTYPE_USER11 158 300#define LINKTYPE_USER12 159 301#define LINKTYPE_USER13 160 302#define LINKTYPE_USER14 161 303#define LINKTYPE_USER15 162 304 305/* 306 * For future use with 802.11 captures - defined by AbsoluteValue 307 * Systems to store a number of bits of link-layer information 308 * including radio information: 309 * 310 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 311 */ 312#define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */ 313 314/* 315 * Juniper-private data link type, as per request from 316 * Hannes Gredler <hannes@juniper.net>. The corresponding 317 * DLT_s are used for passing on chassis-internal 318 * metainformation such as QOS profiles, etc.. 319 */ 320#define LINKTYPE_JUNIPER_MONITOR 164 321 322/* 323 * BACnet MS/TP frames. 324 */ 325#define LINKTYPE_BACNET_MS_TP 165 326 327/* 328 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 329 * 330 * This is used in some OSes to allow a kernel socket filter to distinguish 331 * between incoming and outgoing packets, on a socket intended to 332 * supply pppd with outgoing packets so it can do dial-on-demand and 333 * hangup-on-lack-of-demand; incoming packets are filtered out so they 334 * don't cause pppd to hold the connection up (you don't want random 335 * input packets such as port scans, packets from old lost connections, 336 * etc. to force the connection to stay up). 337 * 338 * The first byte of the PPP header (0xff03) is modified to accomodate 339 * the direction - 0x00 = IN, 0x01 = OUT. 340 */ 341#define LINKTYPE_PPP_PPPD 166 342 343/* 344 * Juniper-private data link type, as per request from 345 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 346 * for passing on chassis-internal metainformation such as 347 * QOS profiles, cookies, etc.. 348 */ 349#define LINKTYPE_JUNIPER_PPPOE 167 350#define LINKTYPE_JUNIPER_PPPOE_ATM 168 351 352#define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 353#define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 354#define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */ 355 356/* 357 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 358 * monitoring equipment. 359 */ 360#define LINKTYPE_GCOM_T1E1 172 361#define LINKTYPE_GCOM_SERIAL 173 362 363/* 364 * Juniper-private data link type, as per request from 365 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 366 * for internal communication to Physical Interface Cards (PIC) 367 */ 368#define LINKTYPE_JUNIPER_PIC_PEER 174 369 370/* 371 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 372 * Measurement Systems. They add an ERF header (see 373 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 374 * the link-layer header. 375 */ 376#define LINKTYPE_ERF_ETH 175 /* Ethernet */ 377#define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 378 379/* 380 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 381 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 382 * includes additional information before the LAPD header, so it's 383 * not necessarily a generic LAPD header. 384 */ 385#define LINKTYPE_LINUX_LAPD 177 386 387/* 388 * Juniper-private data link type, as per request from 389 * Hannes Gredler <hannes@juniper.net>. 390 * The Link Types are used for prepending meta-information 391 * like interface index, interface name 392 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 393 */ 394#define LINKTYPE_JUNIPER_ETHER 178 395#define LINKTYPE_JUNIPER_PPP 179 396#define LINKTYPE_JUNIPER_FRELAY 180 397#define LINKTYPE_JUNIPER_CHDLC 181 398 399/* 400 * Multi Link Frame Relay (FRF.16) 401 */ 402#define LINKTYPE_MFR 182 403 404/* 405 * Juniper-private data link type, as per request from 406 * Hannes Gredler <hannes@juniper.net>. 407 * The DLT_ is used for internal communication with a 408 * voice Adapter Card (PIC) 409 */ 410#define LINKTYPE_JUNIPER_VP 183 411 412/* 413 * Arinc 429 frames. 414 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 415 * Every frame contains a 32bit A429 label. 416 * More documentation on Arinc 429 can be found at 417 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 418 */ 419#define LINKTYPE_A429 184 420 421/* 422 * Arinc 653 Interpartition Communication messages. 423 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 424 * Please refer to the A653-1 standard for more information. 425 */ 426#define LINKTYPE_A653_ICM 185 427 428/* 429 * USB packets, beginning with a USB setup header; requested by 430 * Paolo Abeni <paolo.abeni@email.it>. 431 */ 432#define LINKTYPE_USB 186 433 434/* 435 * Bluetooth HCI UART transport layer (part H:4); requested by 436 * Paolo Abeni. 437 */ 438#define LINKTYPE_BLUETOOTH_HCI_H4 187 439 440/* 441 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz 442 * <cruz_petagay@bah.com>. 443 */ 444#define LINKTYPE_IEEE802_16_MAC_CPS 188 445 446/* 447 * USB packets, beginning with a Linux USB header; requested by 448 * Paolo Abeni <paolo.abeni@email.it>. 449 */ 450#define LINKTYPE_USB_LINUX 189 451 452/* 453 * Controller Area Network (CAN) v. 2.0B packets. 454 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 455 * Used to dump CAN packets coming from a CAN Vector board. 456 * More documentation on the CAN v2.0B frames can be found at 457 * http://www.can-cia.org/downloads/?269 458 */ 459#define LINKTYPE_CAN20B 190 460 461/* 462 * IEEE 802.15.4, with address fields padded, as is done by Linux 463 * drivers; requested by Juergen Schimmer. 464 */ 465#define LINKTYPE_IEEE802_15_4_LINUX 191 466 467/* 468 * Per Packet Information encapsulated packets. 469 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 470 */ 471#define LINKTYPE_PPI 192 472 473/* 474 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; 475 * requested by Charles Clancy. 476 */ 477#define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 478 479/* 480 * Juniper-private data link type, as per request from 481 * Hannes Gredler <hannes@juniper.net>. 482 * The DLT_ is used for internal communication with a 483 * integrated service module (ISM). 484 */ 485#define LINKTYPE_JUNIPER_ISM 194 486 487/* 488 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 489 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>. 490 */ 491#define LINKTYPE_IEEE802_15_4 195 492 493/* 494 * Various link-layer types, with a pseudo-header, for SITA 495 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). 496 */ 497#define LINKTYPE_SITA 196 498 499/* 500 * Various link-layer types, with a pseudo-header, for Endace DAG cards; 501 * encapsulates Endace ERF records. Requested by Stephen Donnelly 502 * <stephen@endace.com>. 503 */ 504#define LINKTYPE_ERF 197 505 506/* 507 * Special header prepended to Ethernet packets when capturing from a 508 * u10 Networks board. Requested by Phil Mulholland 509 * <phil@u10networks.com>. 510 */ 511#define LINKTYPE_RAIF1 198 512 513/* 514 * IPMB packet for IPMI, beginning with the I2C slave address, followed 515 * by the netFn and LUN, etc.. Requested by Chanthy Toeung 516 * <chanthy.toeung@ca.kontron.com>. 517 */ 518#define LINKTYPE_IPMB 199 519 520/* 521 * Juniper-private data link type, as per request from 522 * Hannes Gredler <hannes@juniper.net>. 523 * The DLT_ is used for capturing data on a secure tunnel interface. 524 */ 525#define LINKTYPE_JUNIPER_ST 200 526 527/* 528 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header 529 * that includes direction information; requested by Paolo Abeni. 530 */ 531#define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 532 533/* 534 * AX.25 packet with a 1-byte KISS header; see 535 * 536 * http://www.ax25.net/kiss.htm 537 * 538 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>. 539 */ 540#define LINKTYPE_AX25_KISS 202 541 542/* 543 * LAPD packets from an ISDN channel, starting with the address field, 544 * with no pseudo-header. 545 * Requested by Varuna De Silva <varunax@gmail.com>. 546 */ 547#define LINKTYPE_LAPD 203 548 549/* 550 * Variants of various link-layer headers, with a one-byte direction 551 * pseudo-header prepended - zero means "received by this host", 552 * non-zero (any non-zero value) means "sent by this host" - as per 553 * Will Barker <w.barker@zen.co.uk>. 554 */ 555#define LINKTYPE_PPP_WITH_DIR 204 /* PPP */ 556#define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ 557#define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ 558#define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ 559 560/* 561 * 208 is reserved for an as-yet-unspecified proprietary link-layer 562 * type, as requested by Will Barker. 563 */ 564 565/* 566 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman 567 * <avn@pigeonpoint.com>. 568 */ 569#define LINKTYPE_IPMB_LINUX 209 570 571/* 572 * FlexRay automotive bus - http://www.flexray.com/ - as requested 573 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 574 */ 575#define LINKTYPE_FLEXRAY 210 576 577/* 578 * Media Oriented Systems Transport (MOST) bus for multimedia 579 * transport - http://www.mostcooperation.com/ - as requested 580 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 581 */ 582#define LINKTYPE_MOST 211 583 584/* 585 * Local Interconnect Network (LIN) bus for vehicle networks - 586 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber 587 * <hannes.kaelber@x2e.de>. 588 */ 589#define LINKTYPE_LIN 212 590 591/* 592 * X2E-private data link type used for serial line capture, 593 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 594 */ 595#define LINKTYPE_X2E_SERIAL 213 596 597/* 598 * X2E-private data link type used for the Xoraya data logger 599 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 600 */ 601#define LINKTYPE_X2E_XORAYA 214 602 603/* 604 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 605 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets 606 * of 0 as preamble, one octet of SFD, one octet of frame length+ 607 * reserved bit, and then the MAC-layer data, starting with the 608 * frame control field). 609 * 610 * Requested by Max Filippov <jcmvbkbc@gmail.com>. 611 */ 612#define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 613 614/* 615 * David Gibson <david@gibson.dropbear.id.au> requested this for 616 * captures from the Linux kernel /dev/input/eventN devices. This 617 * is used to communicate keystrokes and mouse movements from the 618 * Linux kernel to display systems, such as Xorg. 619 */ 620#define LINKTYPE_LINUX_EVDEV 216 621 622/* 623 * GSM Um and Abis interfaces, preceded by a "gsmtap" header. 624 * 625 * Requested by Harald Welte <laforge@gnumonks.org>. 626 */ 627#define LINKTYPE_GSMTAP_UM 217 628#define LINKTYPE_GSMTAP_ABIS 218 629 630/* 631 * MPLS, with an MPLS label as the link-layer header. 632 * Requested by Michele Marchetto <michele@openbsd.org> on behalf 633 * of OpenBSD. 634 */ 635#define LINKTYPE_MPLS 219 636 637/* 638 * USB packets, beginning with a Linux USB header, with the USB header 639 * padded to 64 bytes; required for memory-mapped access. 640 */ 641#define LINKTYPE_USB_LINUX_MMAPPED 220 642 643/* 644 * DECT packets, with a pseudo-header; requested by 645 * Matthias Wenzel <tcpdump@mazzoo.de>. 646 */ 647#define LINKTYPE_DECT 221 648 649/* 650 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov> 651 * Date: Mon, 11 May 2009 11:18:30 -0500 652 * 653 * DLT_AOS. We need it for AOS Space Data Link Protocol. 654 * I have already written dissectors for but need an OK from 655 * legal before I can submit a patch. 656 * 657 */ 658#define LINKTYPE_AOS 222 659 660/* 661 * Wireless HART (Highway Addressable Remote Transducer) 662 * From the HART Communication Foundation 663 * IES/PAS 62591 664 * 665 * Requested by Sam Roberts <vieuxtech@gmail.com>. 666 */ 667#define LINKTYPE_WIHART 223 668 669/* 670 * Fibre Channel FC-2 frames, beginning with a Frame_Header. 671 * Requested by Kahou Lei <kahou82@gmail.com>. 672 */ 673#define LINKTYPE_FC_2 224 674 675/* 676 * Fibre Channel FC-2 frames, beginning with an encoding of the 677 * SOF, and ending with an encoding of the EOF. 678 * 679 * The encodings represent the frame delimiters as 4-byte sequences 680 * representing the corresponding ordered sets, with K28.5 681 * represented as 0xBC, and the D symbols as the corresponding 682 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, 683 * is represented as 0xBC 0xB5 0x55 0x55. 684 * 685 * Requested by Kahou Lei <kahou82@gmail.com>. 686 */ 687#define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 688 689/* 690 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>. 691 * 692 * The pseudo-header starts with a one-byte version number; for version 2, 693 * the pseudo-header is: 694 * 695 * struct dl_ipnetinfo { 696 * u_int8_t dli_version; 697 * u_int8_t dli_family; 698 * u_int16_t dli_htype; 699 * u_int32_t dli_pktlen; 700 * u_int32_t dli_ifindex; 701 * u_int32_t dli_grifindex; 702 * u_int32_t dli_zsrc; 703 * u_int32_t dli_zdst; 704 * }; 705 * 706 * dli_version is 2 for the current version of the pseudo-header. 707 * 708 * dli_family is a Solaris address family value, so it's 2 for IPv4 709 * and 26 for IPv6. 710 * 711 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing 712 * packets, and 2 for packets arriving from another zone on the same 713 * machine. 714 * 715 * dli_pktlen is the length of the packet data following the pseudo-header 716 * (so the captured length minus dli_pktlen is the length of the 717 * pseudo-header, assuming the entire pseudo-header was captured). 718 * 719 * dli_ifindex is the interface index of the interface on which the 720 * packet arrived. 721 * 722 * dli_grifindex is the group interface index number (for IPMP interfaces). 723 * 724 * dli_zsrc is the zone identifier for the source of the packet. 725 * 726 * dli_zdst is the zone identifier for the destination of the packet. 727 * 728 * A zone number of 0 is the global zone; a zone number of 0xffffffff 729 * means that the packet arrived from another host on the network, not 730 * from another zone on the same machine. 731 * 732 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates 733 * which of those it is. 734 */ 735#define LINKTYPE_IPNET 226 736 737/* 738 * CAN (Controller Area Network) frames, with a pseudo-header as supplied 739 * by Linux SocketCAN. See Documentation/networking/can.txt in the Linux 740 * source. 741 * 742 * Requested by Felix Obenhuber <felix@obenhuber.de>. 743 */ 744#define LINKTYPE_CAN_SOCKETCAN 227 745 746/* 747 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies 748 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>. 749 */ 750#define LINKTYPE_IPV4 228 751#define LINKTYPE_IPV6 229 752 753/* 754 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 755 * nothing), and with no FCS at the end of the frame; requested by 756 * Jon Smirl <jonsmirl@gmail.com>. 757 */ 758#define LINKTYPE_IEEE802_15_4_NOFCS 230 759 760/* 761 * Raw D-Bus: 762 * 763 * http://www.freedesktop.org/wiki/Software/dbus 764 * 765 * messages: 766 * 767 * http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages 768 * 769 * starting with the endianness flag, followed by the message type, etc., 770 * but without the authentication handshake before the message sequence: 771 * 772 * http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol 773 * 774 * Requested by Martin Vidner <martin@vidner.net>. 775 */ 776#define LINKTYPE_DBUS 231 777 778/* 779 * Juniper-private data link type, as per request from 780 * Hannes Gredler <hannes@juniper.net>. 781 */ 782#define LINKTYPE_JUNIPER_VS 232 783#define LINKTYPE_JUNIPER_SRX_E2E 233 784#define LINKTYPE_JUNIPER_FIBRECHANNEL 234 785 786/* 787 * DVB-CI (DVB Common Interface for communication between a PC Card 788 * module and a DVB receiver). See 789 * 790 * http://www.kaiser.cx/pcap-dvbci.html 791 * 792 * for the specification. 793 * 794 * Requested by Martin Kaiser <martin@kaiser.cx>. 795 */ 796#define LINKTYPE_DVB_CI 235 797 798/* 799 * Variant of 3GPP TS 27.010 multiplexing protocol. Requested 800 * by Hans-Christoph Schemmel <hans-christoph.schemmel@cinterion.com>. 801 */ 802#define LINKTYPE_MUX27010 236 803 804/* 805 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray 806 * <barisdemiray@gmail.com>. 807 */ 808#define LINKTYPE_STANAG_5066_D_PDU 237 809 810/* 811 * Juniper-private data link type, as per request from 812 * Hannes Gredler <hannes@juniper.net>. 813 */ 814#define LINKTYPE_JUNIPER_ATM_CEMIC 238 815 816/* 817 * NetFilter LOG messages 818 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets) 819 * 820 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl> 821 */ 822#define LINKTYPE_NFLOG 239 823 824/* 825 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 826 * for Ethernet packets with a 4-byte pseudo-header and always 827 * with the payload including the FCS, as supplied by their 828 * netANALYZER hardware and software. 829 * 830 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 831 */ 832#define LINKTYPE_NETANALYZER 240 833 834/* 835 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 836 * for Ethernet packets with a 4-byte pseudo-header and FCS and 837 * 1 byte of SFD, as supplied by their netANALYZER hardware and 838 * software. 839 * 840 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 841 */ 842#define LINKTYPE_NETANALYZER_TRANSPARENT 241 843 844/* 845 * IP-over-InfiniBand, as specified by RFC 4391. 846 * 847 * Requested by Petr Sumbera <petr.sumbera@oracle.com>. 848 */ 849#define LINKTYPE_IPOIB 242 850 851/* 852 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0). 853 * 854 * Requested by Guy Martin <gmsoft@tuxicoman.be>. 855 */ 856#define LINKTYPE_MPEG_2_TS 243 857 858/* 859 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as 860 * used by their ng40 protocol tester. 861 * 862 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>. 863 */ 864#define LINKTYPE_NG40 244 865 866/* 867 * Pseudo-header giving adapter number and flags, followed by an NFC 868 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU, 869 * as specified by NFC Forum Logical Link Control Protocol Technical 870 * Specification LLCP 1.1. 871 * 872 * Requested by Mike Wakerly <mikey@google.com>. 873 */ 874#define LINKTYPE_NFC_LLCP 245 875 876/* 877 * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in 878 * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and Mac OS X, and 879 * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a 880 * shiny new link-layer header type value that doesn't collide with 881 * anything, in the hopes that future pfsync savefiles, if any, 882 * won't require special hacks to distinguish from other savefiles. 883 * 884 */ 885#define LINKTYPE_PFSYNC 246 886 887/* 888 * Raw InfiniBand packets, starting with the Local Routing Header. 889 * 890 * Requested by Oren Kladnitsky <orenk@mellanox.com>. 891 */ 892#define LINKTYPE_INFINIBAND 247 893 894/* 895 * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6). 896 * 897 * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>. 898 */ 899#define LINKTYPE_SCTP 248 900 901/* 902 * USB packets, beginning with a USBPcap header. 903 * 904 * Requested by Tomasz Mon <desowin@gmail.com> 905 */ 906#define LINKTYPE_USBPCAP 249 907 908/* 909 * Schweitzer Engineering Laboratories "RTAC" product serial-line 910 * packets. 911 * 912 * Requested by Chris Bontje <chris_bontje@selinc.com>. 913 */ 914#define DLT_RTAC_SERIAL 250 915 916/* 917 * Bluetooth Low Energy air interface link-layer packets. 918 * 919 * Requested by Mike Kershaw <dragorn@kismetwireless.net>. 920 */ 921#define LINKTYPE_BLUETOOTH_LE_LL 251 922 923/* 924 * Link-layer header type for upper-protocol layer PDU saves from wireshark. 925 * 926 * the actual contents are determined by two TAGs stored with each 927 * packet: 928 * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the 929 * original packet. 930 * 931 * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector 932 * that can make sense of the data stored. 933 */ 934#define LINKTYPE_WIRESHARK_UPPER_PDU 252 935 936/* 937 * Link-layer header type for the netlink protocol (nlmon devices). 938 */ 939#define LINKTYPE_NETLINK 253 940 941/* 942 * Bluetooth Linux Monitor headers for the BlueZ stack. 943 */ 944#define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254 945 946/* 947 * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as 948 * captured by Ubertooth. 949 */ 950#define LINKTYPE_BLUETOOTH_BREDR_BB 255 951 952/* 953 * Bluetooth Low Energy link layer packets, as captured by Ubertooth. 954 */ 955#define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256 956 957/* 958 * PROFIBUS data link layer. 959 */ 960#define LINKTYPE_PROFIBUS_DL 257 961 962 963/* 964 * Apple's DLT_PKTAP headers. 965 * 966 * Sadly, the folks at Apple either had no clue that the DLT_USERn values 967 * are for internal use within an organization and partners only, and 968 * didn't know that the right way to get a link-layer header type is to 969 * ask tcpdump.org for one, or knew and didn't care, so they just 970 * used DLT_USER2, which causes problems for everything except for 971 * their version of tcpdump. 972 * 973 * So I'll just give them one; hopefully this will show up in a 974 * libpcap release in time for them to get this into 10.10 Big Sur 975 * or whatever Mavericks' successor is called. LINKTYPE_PKTAP 976 * will be 258 *even on OS X*; that is *intentional*, so that 977 * PKTAP files look the same on *all* OSes (different OSes can have 978 * different numerical values for a given DLT_, but *MUST NOT* have 979 * different values for what goes in a file, as files can be moved 980 * between OSes!). 981 */ 982#define LINKTYPE_PKTAP 258 983 984/* 985 * Ethernet packets preceded by a header giving the last 6 octets 986 * of the preamble specified by 802.3-2012 Clause 65, section 987 * 65.1.3.2 "Transmit". 988 */ 989#define LINKTYPE_EPON 259 990 991/* 992 * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format" 993 * in the PICMG HPM.2 specification. 994 */ 995#define LINKTYPE_IPMI_HPM_2 260 996 997#define LINKTYPE_MATCHING_MAX 260 /* highest value in the "matching" range */ 998 999static struct linktype_map { 1000 int dlt; 1001 int linktype; 1002} map[] = { 1003 /* 1004 * These DLT_* codes have LINKTYPE_* codes with values identical 1005 * to the values of the corresponding DLT_* code. 1006 */ 1007 { DLT_NULL, LINKTYPE_NULL }, 1008 { DLT_EN10MB, LINKTYPE_ETHERNET }, 1009 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 1010 { DLT_AX25, LINKTYPE_AX25 }, 1011 { DLT_PRONET, LINKTYPE_PRONET }, 1012 { DLT_CHAOS, LINKTYPE_CHAOS }, 1013 { DLT_IEEE802, LINKTYPE_IEEE802_5 }, 1014 { DLT_ARCNET, LINKTYPE_ARCNET_BSD }, 1015 { DLT_SLIP, LINKTYPE_SLIP }, 1016 { DLT_PPP, LINKTYPE_PPP }, 1017 { DLT_FDDI, LINKTYPE_FDDI }, 1018 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 1019 1020 /* 1021 * These DLT_* codes have different values on different 1022 * platforms; we map them to LINKTYPE_* codes that 1023 * have values that should never be equal to any DLT_* 1024 * code. 1025 */ 1026#ifdef DLT_FR 1027 /* BSD/OS Frame Relay */ 1028 { DLT_FR, LINKTYPE_FRELAY }, 1029#endif 1030 1031 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 1032 { DLT_RAW, LINKTYPE_RAW }, 1033 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 1034 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 1035 1036 /* BSD/OS Cisco HDLC */ 1037 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 1038 1039 /* 1040 * These DLT_* codes are not on all platforms, but, so far, 1041 * there don't appear to be any platforms that define 1042 * other codes with those values; we map them to 1043 * different LINKTYPE_* values anyway, just in case. 1044 */ 1045 1046 /* Linux ATM Classical IP */ 1047 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 1048 1049 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 1050 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 1051 1052 /* NetBSD PPP over Ethernet */ 1053 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 1054 1055 /* 1056 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN 1057 * and LINKTYPE_MATCHING_MAX are mapped to identical 1058 * DLT_ values. 1059 */ 1060 1061 { -1, -1 } 1062}; 1063 1064int 1065dlt_to_linktype(int dlt) 1066{ 1067 int i; 1068 1069 /* 1070 * DLTs that, on some platforms, have values in the matching range 1071 * but that *don't* have the same value as the corresponding 1072 * LINKTYPE because, for some reason, not all OSes have the 1073 * same value for that DLT (note that the DLT's value might be 1074 * outside the matching range on some of those OSes). 1075 */ 1076 if (dlt == DLT_PFSYNC) 1077 return (LINKTYPE_PFSYNC); 1078 if (dlt == DLT_PKTAP) 1079 return (LINKTYPE_PKTAP); 1080 1081 /* 1082 * For all other values in the matching range, the DLT 1083 * value is the same as the LINKTYPE value. 1084 */ 1085 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX) 1086 return (dlt); 1087 1088 /* 1089 * Map the values outside that range. 1090 */ 1091 for (i = 0; map[i].dlt != -1; i++) { 1092 if (map[i].dlt == dlt) 1093 return (map[i].linktype); 1094 } 1095 1096 /* 1097 * If we don't have a mapping for this DLT, return an 1098 * error; that means that this is a value with no corresponding 1099 * LINKTYPE, and we need to assign one. 1100 */ 1101 return (-1); 1102} 1103 1104int 1105linktype_to_dlt(int linktype) 1106{ 1107 int i; 1108 1109 /* 1110 * LINKTYPEs in the matching range that *don't* 1111 * have the same value as the corresponding DLTs 1112 * because, for some reason, not all OSes have the 1113 * same value for that DLT. 1114 */ 1115 if (linktype == LINKTYPE_PFSYNC) 1116 return (DLT_PFSYNC); 1117 if (linktype == LINKTYPE_PKTAP) 1118 return (DLT_PKTAP); 1119 1120 /* 1121 * For all other values in the matching range, the LINKTYPE 1122 * value is the same as the DLT value. 1123 */ 1124 if (linktype >= LINKTYPE_MATCHING_MIN && 1125 linktype <= LINKTYPE_MATCHING_MAX) 1126 return (linktype); 1127 1128 /* 1129 * Map the values outside that range. 1130 */ 1131 for (i = 0; map[i].linktype != -1; i++) { 1132 if (map[i].linktype == linktype) 1133 return (map[i].dlt); 1134 } 1135 1136 /* 1137 * If we don't have an entry for this LINKTYPE, return 1138 * the link type value; it may be a DLT from an older 1139 * version of libpcap. 1140 */ 1141 return linktype; 1142} 1143 1144/* 1145 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1146 * byte order when capturing (it's supplied directly from a 1147 * memory-mapped buffer shared by the kernel). 1148 * 1149 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1150 * we need to convert it from the byte order of the host that wrote 1151 * the file to this host's byte order. 1152 */ 1153static void 1154swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1155 int header_len_64_bytes) 1156{ 1157 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1158 bpf_u_int32 offset = 0; 1159 usb_isodesc *pisodesc; 1160 int32_t numdesc, i; 1161 1162 /* 1163 * "offset" is the offset *past* the field we're swapping; 1164 * we skip the field *before* checking to make sure 1165 * the captured data length includes the entire field. 1166 */ 1167 1168 /* 1169 * The URB id is a totally opaque value; do we really need to 1170 * convert it to the reading host's byte order??? 1171 */ 1172 offset += 8; /* skip past id */ 1173 if (hdr->caplen < offset) 1174 return; 1175 uhdr->id = SWAPLL(uhdr->id); 1176 1177 offset += 4; /* skip past various 1-byte fields */ 1178 1179 offset += 2; /* skip past bus_id */ 1180 if (hdr->caplen < offset) 1181 return; 1182 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1183 1184 offset += 2; /* skip past various 1-byte fields */ 1185 1186 offset += 8; /* skip past ts_sec */ 1187 if (hdr->caplen < offset) 1188 return; 1189 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1190 1191 offset += 4; /* skip past ts_usec */ 1192 if (hdr->caplen < offset) 1193 return; 1194 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1195 1196 offset += 4; /* skip past status */ 1197 if (hdr->caplen < offset) 1198 return; 1199 uhdr->status = SWAPLONG(uhdr->status); 1200 1201 offset += 4; /* skip past urb_len */ 1202 if (hdr->caplen < offset) 1203 return; 1204 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1205 1206 offset += 4; /* skip past data_len */ 1207 if (hdr->caplen < offset) 1208 return; 1209 uhdr->data_len = SWAPLONG(uhdr->data_len); 1210 1211 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1212 offset += 4; /* skip past s.iso.error_count */ 1213 if (hdr->caplen < offset) 1214 return; 1215 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count); 1216 1217 offset += 4; /* skip past s.iso.numdesc */ 1218 if (hdr->caplen < offset) 1219 return; 1220 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc); 1221 } else 1222 offset += 8; /* skip USB setup header */ 1223 1224 if (header_len_64_bytes) { 1225 /* 1226 * This is either the "version 1" header, with 1227 * 16 bytes of additional fields at the end, or 1228 * a "version 0" header from a memory-mapped 1229 * capture, with 16 bytes of zeroed-out padding 1230 * at the end. Byte swap them as if this were 1231 * a "version 1" header. 1232 */ 1233 offset += 4; /* skip past interval */ 1234 if (hdr->caplen < offset) 1235 return; 1236 uhdr->interval = SWAPLONG(uhdr->interval); 1237 1238 offset += 4; /* skip past start_frame */ 1239 if (hdr->caplen < offset) 1240 return; 1241 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1242 1243 offset += 4; /* skip past xfer_flags */ 1244 if (hdr->caplen < offset) 1245 return; 1246 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1247 1248 offset += 4; /* skip past ndesc */ 1249 if (hdr->caplen < offset) 1250 return; 1251 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1252 } 1253 1254 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1255 /* swap the values in struct linux_usb_isodesc */ 1256 pisodesc = (usb_isodesc *)(void *)(buf+offset); 1257 numdesc = uhdr->s.iso.numdesc; 1258 for (i = 0; i < numdesc; i++) { 1259 offset += 4; /* skip past status */ 1260 if (hdr->caplen < offset) 1261 return; 1262 pisodesc->status = SWAPLONG(pisodesc->status); 1263 1264 offset += 4; /* skip past offset */ 1265 if (hdr->caplen < offset) 1266 return; 1267 pisodesc->offset = SWAPLONG(pisodesc->offset); 1268 1269 offset += 4; /* skip past len */ 1270 if (hdr->caplen < offset) 1271 return; 1272 pisodesc->len = SWAPLONG(pisodesc->len); 1273 1274 offset += 4; /* skip past padding */ 1275 1276 pisodesc++; 1277 } 1278 } 1279} 1280 1281/* 1282 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order 1283 * data. They begin with a fixed-length header with big-endian fields, 1284 * followed by a set of TLVs, where the type and length are in host 1285 * byte order but the values are either big-endian or are a raw byte 1286 * sequence that's the same regardless of the host's byte order. 1287 * 1288 * When reading a DLT_NFLOG capture file, we need to convert the type 1289 * and length values from the byte order of the host that wrote the 1290 * file to the byte order of this host. 1291 */ 1292static void 1293swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf) 1294{ 1295 u_char *p = buf; 1296 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf; 1297 nflog_tlv_t *tlv; 1298 u_int caplen = hdr->caplen; 1299 u_int length = hdr->len; 1300 u_int16_t size; 1301 1302 if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) { 1303 /* Not enough data to have any TLVs. */ 1304 return; 1305 } 1306 1307 if (!(nfhdr->nflog_version) == 0) { 1308 /* Unknown NFLOG version */ 1309 return; 1310 } 1311 1312 length -= sizeof(nflog_hdr_t); 1313 caplen -= sizeof(nflog_hdr_t); 1314 p += sizeof(nflog_hdr_t); 1315 1316 while (caplen >= sizeof(nflog_tlv_t)) { 1317 tlv = (nflog_tlv_t *) p; 1318 1319 /* Swap the type and length. */ 1320 tlv->tlv_type = SWAPSHORT(tlv->tlv_type); 1321 tlv->tlv_length = SWAPSHORT(tlv->tlv_length); 1322 1323 /* Get the length of the TLV. */ 1324 size = tlv->tlv_length; 1325 if (size % 4 != 0) 1326 size += 4 - size % 4; 1327 1328 /* Is the TLV's length less than the minimum? */ 1329 if (size < sizeof(nflog_tlv_t)) { 1330 /* Yes. Give up now. */ 1331 return; 1332 } 1333 1334 /* Do we have enough data for the full TLV? */ 1335 if (caplen < size || length < size) { 1336 /* No. */ 1337 return; 1338 } 1339 1340 /* Skip over the TLV. */ 1341 length -= size; 1342 caplen -= size; 1343 p += size; 1344 } 1345} 1346 1347void 1348swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data) 1349{ 1350 /* 1351 * Convert pseudo-headers from the byte order of 1352 * the host on which the file was saved to our 1353 * byte order, as necessary. 1354 */ 1355 switch (linktype) { 1356 1357 case DLT_USB_LINUX: 1358 swap_linux_usb_header(hdr, data, 0); 1359 break; 1360 1361 case DLT_USB_LINUX_MMAPPED: 1362 swap_linux_usb_header(hdr, data, 1); 1363 break; 1364 1365 case DLT_NFLOG: 1366 swap_nflog_header(hdr, data); 1367 break; 1368 } 1369} 1370