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 * savefile.c - supports offline use of tcpdump 22 * Extraction/creation by Jeffrey Mogul, DECWRL 23 * Modified by Steve McCanne, LBL. 24 * 25 * Used to save the received packet headers, after filtering, to 26 * a file, and then read them later. 27 * The first record in the file contains saved values for the machine 28 * dependent values so we can print the dump file on any architecture. 29 */ 30 31 #ifndef lint 32 static const char rcsid[] _U_ = 33 "@(#) $Header: /tcpdump/master/libpcap/savefile.c,v 1.183 2008-12-23 20:13:29 guy Exp $ (LBL)"; 34 #endif 35 36 #ifdef HAVE_CONFIG_H 37 #include "config.h" 38 #endif 39 40 #ifdef WIN32 41 #include <pcap-stdinc.h> 42 #else /* WIN32 */ 43 #if HAVE_INTTYPES_H 44 #include <inttypes.h> 45 #elif HAVE_STDINT_H 46 #include <stdint.h> 47 #endif 48 #ifdef HAVE_SYS_BITYPES_H 49 #include <sys/bitypes.h> 50 #endif 51 #include <sys/types.h> 52 #endif /* WIN32 */ 53 54 #include "pcap-int.h" 55 #include "pcap/usb.h" 56 57 #include "pcap-common.h" 58 59 /* 60 * We don't write DLT_* values to capture files, because they're not the 61 * same on all platforms. 62 * 63 * Unfortunately, the various flavors of BSD have not always used the same 64 * numerical values for the same data types, and various patches to 65 * libpcap for non-BSD OSes have added their own DLT_* codes for link 66 * layer encapsulation types seen on those OSes, and those codes have had, 67 * in some cases, values that were also used, on other platforms, for other 68 * link layer encapsulation types. 69 * 70 * This means that capture files of a type whose numerical DLT_* code 71 * means different things on different BSDs, or with different versions 72 * of libpcap, can't always be read on systems other than those like 73 * the one running on the machine on which the capture was made. 74 * 75 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 76 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 77 * codes to DLT_* codes when reading a savefile header. 78 * 79 * For those DLT_* codes that have, as far as we know, the same values on 80 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 81 * DLT_xxx; that way, captures of those types can still be read by 82 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 83 * captures of those types written by versions of libpcap that map DLT_ 84 * values to LINKTYPE_ values can still be read by older versions 85 * of libpcap. 86 * 87 * The other LINKTYPE_* codes are given values starting at 100, in the 88 * hopes that no DLT_* code will be given one of those values. 89 * 90 * In order to ensure that a given LINKTYPE_* code's value will refer to 91 * the same encapsulation type on all platforms, you should not allocate 92 * a new LINKTYPE_* value without consulting 93 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will 94 * allocate a value for you, and will not subsequently allocate it to 95 * anybody else; that value will be added to the "pcap.h" in the 96 * tcpdump.org Git repository, so that a future libpcap release will 97 * include it. 98 * 99 * You should, if possible, also contribute patches to libpcap and tcpdump 100 * to handle the new encapsulation type, so that they can also be checked 101 * into the tcpdump.org Git repository and so that they will appear in 102 * future libpcap and tcpdump releases. 103 * 104 * Do *NOT* assume that any values after the largest value in this file 105 * are available; you might not have the most up-to-date version of this 106 * file, and new values after that one might have been assigned. Also, 107 * do *NOT* use any values below 100 - those might already have been 108 * taken by one (or more!) organizations. 109 */ 110 #define LINKTYPE_NULL DLT_NULL 111 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 112 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 113 #define LINKTYPE_AX25 DLT_AX25 114 #define LINKTYPE_PRONET DLT_PRONET 115 #define LINKTYPE_CHAOS DLT_CHAOS 116 #define LINKTYPE_TOKEN_RING DLT_IEEE802 /* DLT_IEEE802 is used for Token Ring */ 117 #define LINKTYPE_ARCNET DLT_ARCNET /* BSD-style headers */ 118 #define LINKTYPE_SLIP DLT_SLIP 119 #define LINKTYPE_PPP DLT_PPP 120 #define LINKTYPE_FDDI DLT_FDDI 121 122 /* 123 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 124 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 125 * field) at the beginning of the packet. 126 * 127 * This is for use when there is always such a header; the address field 128 * might be 0xff, for regular PPP, or it might be an address field for Cisco 129 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 130 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 131 * 132 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 133 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 134 * captures will be written out with a link type that NetBSD's tcpdump 135 * can read. 136 */ 137 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 138 139 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 140 141 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 142 143 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 144 #define LINKTYPE_RAW 101 /* raw IP */ 145 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 146 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 147 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 148 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 149 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 150 #define LINKTYPE_FRELAY 107 /* Frame Relay */ 151 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 152 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 153 154 /* 155 * These three types are reserved for future use. 156 */ 157 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 158 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 159 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 160 161 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 162 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 163 #define LINKTYPE_ECONET 115 /* Acorn Econet */ 164 165 /* 166 * Reserved for use with OpenBSD ipfilter. 167 */ 168 #define LINKTYPE_IPFILTER 116 169 170 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 171 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 172 #define LINKTYPE_PRISM_HEADER 119 /* 802.11+Prism II monitor mode */ 173 #define LINKTYPE_AIRONET_HEADER 120 /* FreeBSD Aironet driver stuff */ 174 175 /* 176 * Reserved for Siemens HiPath HDLC. 177 */ 178 #define LINKTYPE_HHDLC 121 179 180 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 181 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 182 183 /* 184 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 185 * for private use. 186 */ 187 #define LINKTYPE_RIO 124 /* RapidIO */ 188 #define LINKTYPE_PCI_EXP 125 /* PCI Express */ 189 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 190 191 #define LINKTYPE_IEEE802_11_RADIO 127 /* 802.11 plus BSD radio header */ 192 193 /* 194 * Reserved for the TZSP encapsulation, as per request from 195 * Chris Waters <chris.waters@networkchemistry.com> 196 * TZSP is a generic encapsulation for any other link type, 197 * which includes a means to include meta-information 198 * with the packet, e.g. signal strength and channel 199 * for 802.11 packets. 200 */ 201 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 202 203 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 204 205 /* 206 * Juniper-private data link types, as per request from 207 * Hannes Gredler <hannes@juniper.net>. The corresponding 208 * DLT_s are used for passing on chassis-internal 209 * metainformation such as QOS profiles, etc.. 210 */ 211 #define LINKTYPE_JUNIPER_MLPPP 130 212 #define LINKTYPE_JUNIPER_MLFR 131 213 #define LINKTYPE_JUNIPER_ES 132 214 #define LINKTYPE_JUNIPER_GGSN 133 215 #define LINKTYPE_JUNIPER_MFR 134 216 #define LINKTYPE_JUNIPER_ATM2 135 217 #define LINKTYPE_JUNIPER_SERVICES 136 218 #define LINKTYPE_JUNIPER_ATM1 137 219 220 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 221 222 #define LINKTYPE_MTP2_WITH_PHDR 139 223 #define LINKTYPE_MTP2 140 224 #define LINKTYPE_MTP3 141 225 #define LINKTYPE_SCCP 142 226 227 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 228 229 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 230 231 /* 232 * Reserved for IBM SP switch and IBM Next Federation switch. 233 */ 234 #define LINKTYPE_IBM_SP 145 235 #define LINKTYPE_IBM_SN 146 236 237 /* 238 * Reserved for private use. If you have some link-layer header type 239 * that you want to use within your organization, with the capture files 240 * using that link-layer header type not ever be sent outside your 241 * organization, you can use these values. 242 * 243 * No libpcap release will use these for any purpose, nor will any 244 * tcpdump release use them, either. 245 * 246 * Do *NOT* use these in capture files that you expect anybody not using 247 * your private versions of capture-file-reading tools to read; in 248 * particular, do *NOT* use them in products, otherwise you may find that 249 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 250 * read capture files from your firewall/intrusion detection/traffic 251 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 252 * and you may also find that the developers of those applications will 253 * not accept patches to let them read those files. 254 * 255 * Also, do not use them if somebody might send you a capture using them 256 * for *their* private type and tools using them for *your* private type 257 * would have to read them. 258 * 259 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a 260 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use 261 * the type you're given. 262 */ 263 #define LINKTYPE_USER0 147 264 #define LINKTYPE_USER1 148 265 #define LINKTYPE_USER2 149 266 #define LINKTYPE_USER3 150 267 #define LINKTYPE_USER4 151 268 #define LINKTYPE_USER5 152 269 #define LINKTYPE_USER6 153 270 #define LINKTYPE_USER7 154 271 #define LINKTYPE_USER8 155 272 #define LINKTYPE_USER9 156 273 #define LINKTYPE_USER10 157 274 #define LINKTYPE_USER11 158 275 #define LINKTYPE_USER12 159 276 #define LINKTYPE_USER13 160 277 #define LINKTYPE_USER14 161 278 #define LINKTYPE_USER15 162 279 280 /* 281 * For future use with 802.11 captures - defined by AbsoluteValue 282 * Systems to store a number of bits of link-layer information 283 * including radio information: 284 * 285 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 286 * 287 * but could and arguably should also be used by non-AVS Linux 288 * 802.11 drivers; that may happen in the future. 289 */ 290 #define LINKTYPE_IEEE802_11_RADIO_AVS 163 /* 802.11 plus AVS radio header */ 291 292 /* 293 * Juniper-private data link type, as per request from 294 * Hannes Gredler <hannes@juniper.net>. The corresponding 295 * DLT_s are used for passing on chassis-internal 296 * metainformation such as QOS profiles, etc.. 297 */ 298 #define LINKTYPE_JUNIPER_MONITOR 164 299 300 /* 301 * Reserved for BACnet MS/TP. 302 */ 303 #define LINKTYPE_BACNET_MS_TP 165 304 305 /* 306 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 307 * 308 * This is used in some OSes to allow a kernel socket filter to distinguish 309 * between incoming and outgoing packets, on a socket intended to 310 * supply pppd with outgoing packets so it can do dial-on-demand and 311 * hangup-on-lack-of-demand; incoming packets are filtered out so they 312 * don't cause pppd to hold the connection up (you don't want random 313 * input packets such as port scans, packets from old lost connections, 314 * etc. to force the connection to stay up). 315 * 316 * The first byte of the PPP header (0xff03) is modified to accomodate 317 * the direction - 0x00 = IN, 0x01 = OUT. 318 */ 319 #define LINKTYPE_PPP_PPPD 166 320 321 /* 322 * Juniper-private data link type, as per request from 323 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 324 * for passing on chassis-internal metainformation such as 325 * QOS profiles, cookies, etc.. 326 */ 327 #define LINKTYPE_JUNIPER_PPPOE 167 328 #define LINKTYPE_JUNIPER_PPPOE_ATM 168 329 330 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 331 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 332 #define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */ 333 334 /* 335 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 336 * monitoring equipment. 337 */ 338 #define LINKTYPE_GCOM_T1E1 172 339 #define LINKTYPE_GCOM_SERIAL 173 340 341 /* 342 * Juniper-private data link type, as per request from 343 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 344 * for internal communication to Physical Interface Cards (PIC) 345 */ 346 #define LINKTYPE_JUNIPER_PIC_PEER 174 347 348 /* 349 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 350 * Measurement Systems. They add an ERF header (see 351 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 352 * the link-layer header. 353 */ 354 #define LINKTYPE_ERF_ETH 175 /* Ethernet */ 355 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 356 357 /* 358 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 359 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 360 * includes additional information before the LAPD header, so it's 361 * not necessarily a generic LAPD header. 362 */ 363 #define LINKTYPE_LINUX_LAPD 177 364 365 /* 366 * Juniper-private data link type, as per request from 367 * Hannes Gredler <hannes@juniper.net>. 368 * The Link Types are used for prepending meta-information 369 * like interface index, interface name 370 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 371 */ 372 #define LINKTYPE_JUNIPER_ETHER 178 373 #define LINKTYPE_JUNIPER_PPP 179 374 #define LINKTYPE_JUNIPER_FRELAY 180 375 #define LINKTYPE_JUNIPER_CHDLC 181 376 377 /* 378 * Multi Link Frame Relay (FRF.16) 379 */ 380 #define LINKTYPE_MFR 182 381 382 /* 383 * Juniper-private data link type, as per request from 384 * Hannes Gredler <hannes@juniper.net>. 385 * The DLT_ is used for internal communication with a 386 * voice Adapter Card (PIC) 387 */ 388 #define LINKTYPE_JUNIPER_VP 183 389 390 /* 391 * Arinc 429 frames. 392 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 393 * Every frame contains a 32bit A429 label. 394 * More documentation on Arinc 429 can be found at 395 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 396 */ 397 #define LINKTYPE_A429 184 398 399 /* 400 * Arinc 653 Interpartition Communication messages. 401 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 402 * Please refer to the A653-1 standard for more information. 403 */ 404 #define LINKTYPE_A653_ICM 185 405 406 /* 407 * USB packets, beginning with a USB setup header; requested by 408 * Paolo Abeni <paolo.abeni@email.it>. 409 */ 410 #define LINKTYPE_USB 186 411 412 /* 413 * Bluetooth HCI UART transport layer (part H:4); requested by 414 * Paolo Abeni. 415 */ 416 #define LINKTYPE_BLUETOOTH_HCI_H4 187 417 418 /* 419 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz 420 * <cruz_petagay@bah.com>. 421 */ 422 #define LINKTYPE_IEEE802_16_MAC_CPS 188 423 424 /* 425 * USB packets, beginning with a Linux USB header; requested by 426 * Paolo Abeni <paolo.abeni@email.it>. 427 */ 428 #define LINKTYPE_USB_LINUX 189 429 430 /* 431 * Controller Area Network (CAN) v. 2.0B packets. 432 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 433 * Used to dump CAN packets coming from a CAN Vector board. 434 * More documentation on the CAN v2.0B frames can be found at 435 * http://www.can-cia.org/downloads/?269 436 */ 437 #define LINKTYPE_CAN20B 190 438 439 /* 440 * IEEE 802.15.4, with address fields padded, as is done by Linux 441 * drivers; requested by Juergen Schimmer. 442 */ 443 #define LINKTYPE_IEEE802_15_4_LINUX 191 444 445 /* 446 * Per Packet Information encapsulated packets. 447 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 448 */ 449 #define LINKTYPE_PPI 192 450 451 /* 452 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; 453 * requested by Charles Clancy. 454 */ 455 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 456 457 /* 458 * Juniper-private data link type, as per request from 459 * Hannes Gredler <hannes@juniper.net>. 460 * The DLT_ is used for internal communication with a 461 * integrated service module (ISM). 462 */ 463 #define LINKTYPE_JUNIPER_ISM 194 464 465 /* 466 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 467 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>. 468 */ 469 #define LINKTYPE_IEEE802_15_4 195 470 471 /* 472 * Various link-layer types, with a pseudo-header, for SITA 473 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). 474 */ 475 #define LINKTYPE_SITA 196 476 477 /* 478 * Various link-layer types, with a pseudo-header, for Endace DAG cards; 479 * encapsulates Endace ERF records. Requested by Stephen Donnelly 480 * <stephen@endace.com>. 481 */ 482 #define LINKTYPE_ERF 197 483 484 /* 485 * Special header prepended to Ethernet packets when capturing from a 486 * u10 Networks board. Requested by Phil Mulholland 487 * <phil@u10networks.com>. 488 */ 489 #define LINKTYPE_RAIF1 198 490 491 /* 492 * IPMB packet for IPMI, beginning with the I2C slave address, followed 493 * by the netFn and LUN, etc.. Requested by Chanthy Toeung 494 * <chanthy.toeung@ca.kontron.com>. 495 */ 496 #define LINKTYPE_IPMB 199 497 498 /* 499 * Juniper-private data link type, as per request from 500 * Hannes Gredler <hannes@juniper.net>. 501 * The DLT_ is used for capturing data on a secure tunnel interface. 502 */ 503 #define LINKTYPE_JUNIPER_ST 200 504 505 /* 506 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header 507 * that includes direction information; requested by Paolo Abeni. 508 */ 509 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 510 511 /* 512 * AX.25 packet with a 1-byte KISS header; see 513 * 514 * http://www.ax25.net/kiss.htm 515 * 516 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>. 517 */ 518 #define LINKTYPE_AX25_KISS 202 519 520 /* 521 * LAPD packets from an ISDN channel, starting with the address field, 522 * with no pseudo-header. 523 * Requested by Varuna De Silva <varunax@gmail.com>. 524 */ 525 #define LINKTYPE_LAPD 203 526 527 /* 528 * Variants of various link-layer headers, with a one-byte direction 529 * pseudo-header prepended - zero means "received by this host", 530 * non-zero (any non-zero value) means "sent by this host" - as per 531 * Will Barker <w.barker@zen.co.uk>. 532 */ 533 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */ 534 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ 535 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ 536 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ 537 538 /* 539 * 208 is reserved for an as-yet-unspecified proprietary link-layer 540 * type, as requested by Will Barker. 541 */ 542 543 /* 544 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman 545 * <avn@pigeonpoint.com>. 546 */ 547 #define LINKTYPE_IPMB_LINUX 209 548 549 /* 550 * FlexRay automotive bus - http://www.flexray.com/ - as requested 551 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 552 */ 553 #define LINKTYPE_FLEXRAY 210 554 555 /* 556 * Media Oriented Systems Transport (MOST) bus for multimedia 557 * transport - http://www.mostcooperation.com/ - as requested 558 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 559 */ 560 #define LINKTYPE_MOST 211 561 562 /* 563 * Local Interconnect Network (LIN) bus for vehicle networks - 564 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber 565 * <hannes.kaelber@x2e.de>. 566 */ 567 #define LINKTYPE_LIN 212 568 569 /* 570 * X2E-private data link type used for serial line capture, 571 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 572 */ 573 #define LINKTYPE_X2E_SERIAL 213 574 575 /* 576 * X2E-private data link type used for the Xoraya data logger 577 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 578 */ 579 #define LINKTYPE_X2E_XORAYA 214 580 581 /* 582 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 583 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets 584 * of 0 as preamble, one octet of SFD, one octet of frame length+ 585 * reserved bit, and then the MAC-layer data, starting with the 586 * frame control field). 587 * 588 * Requested by Max Filippov <jcmvbkbc@gmail.com>. 589 */ 590 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 591 592 /* 593 * David Gibson <david@gibson.dropbear.id.au> requested this for 594 * captures from the Linux kernel /dev/input/eventN devices. This 595 * is used to communicate keystrokes and mouse movements from the 596 * Linux kernel to display systems, such as Xorg. 597 */ 598 #define LINKTYPE_LINUX_EVDEV 216 599 600 /* 601 * GSM Um and Abis interfaces, preceded by a "gsmtap" header. 602 * 603 * Requested by Harald Welte <laforge@gnumonks.org>. 604 */ 605 #define LINKTYPE_GSMTAP_UM 217 606 #define LINKTYPE_GSMTAP_ABIS 218 607 608 /* 609 * MPLS, with an MPLS label as the link-layer header. 610 * Requested by Michele Marchetto <michele@openbsd.org> on behalf 611 * of OpenBSD. 612 */ 613 #define LINKTYPE_MPLS 219 614 615 /* 616 * USB packets, beginning with a Linux USB header, with the USB header 617 * padded to 64 bytes; required for memory-mapped access. 618 */ 619 #define LINKTYPE_USB_LINUX_MMAPPED 220 620 621 /* 622 * DECT packets, with a pseudo-header; requested by 623 * Matthias Wenzel <tcpdump@mazzoo.de>. 624 */ 625 #define LINKTYPE_DECT 221 626 627 /* 628 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov> 629 * Date: Mon, 11 May 2009 11:18:30 -0500 630 * 631 * DLT_AOS. We need it for AOS Space Data Link Protocol. 632 * I have already written dissectors for but need an OK from 633 * legal before I can submit a patch. 634 * 635 */ 636 #define LINKTYPE_AOS 222 637 638 /* 639 * Wireless HART (Highway Addressable Remote Transducer) 640 * From the HART Communication Foundation 641 * IES/PAS 62591 642 * 643 * Requested by Sam Roberts <vieuxtech@gmail.com>. 644 */ 645 #define LINKTYPE_WIHART 223 646 647 /* 648 * Fibre Channel FC-2 frames, beginning with a Frame_Header. 649 * Requested by Kahou Lei <kahou82@gmail.com>. 650 */ 651 #define LINKTYPE_FC_2 224 652 653 /* 654 * Fibre Channel FC-2 frames, beginning with an encoding of the 655 * SOF, and ending with an encoding of the EOF. 656 * 657 * The encodings represent the frame delimiters as 4-byte sequences 658 * representing the corresponding ordered sets, with K28.5 659 * represented as 0xBC, and the D symbols as the corresponding 660 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, 661 * is represented as 0xBC 0xB5 0x55 0x55. 662 * 663 * Requested by Kahou Lei <kahou82@gmail.com>. 664 */ 665 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 666 667 /* 668 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>. 669 * 670 * The pseudo-header starts with a one-byte version number; for version 2, 671 * the pseudo-header is: 672 * 673 * struct dl_ipnetinfo { 674 * u_int8_t dli_version; 675 * u_int8_t dli_family; 676 * u_int16_t dli_htype; 677 * u_int32_t dli_pktlen; 678 * u_int32_t dli_ifindex; 679 * u_int32_t dli_grifindex; 680 * u_int32_t dli_zsrc; 681 * u_int32_t dli_zdst; 682 * }; 683 * 684 * dli_version is 2 for the current version of the pseudo-header. 685 * 686 * dli_family is a Solaris address family value, so it's 2 for IPv4 687 * and 26 for IPv6. 688 * 689 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing 690 * packets, and 2 for packets arriving from another zone on the same 691 * machine. 692 * 693 * dli_pktlen is the length of the packet data following the pseudo-header 694 * (so the captured length minus dli_pktlen is the length of the 695 * pseudo-header, assuming the entire pseudo-header was captured). 696 * 697 * dli_ifindex is the interface index of the interface on which the 698 * packet arrived. 699 * 700 * dli_grifindex is the group interface index number (for IPMP interfaces). 701 * 702 * dli_zsrc is the zone identifier for the source of the packet. 703 * 704 * dli_zdst is the zone identifier for the destination of the packet. 705 * 706 * A zone number of 0 is the global zone; a zone number of 0xffffffff 707 * means that the packet arrived from another host on the network, not 708 * from another zone on the same machine. 709 * 710 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates 711 * which of those it is. 712 */ 713 #define LINKTYPE_IPNET 226 714 715 /* 716 * CAN (Controller Area Network) frames, with a pseudo-header as supplied 717 * by Linux SocketCAN. See Documentation/networking/can.txt in the Linux 718 * source. 719 * 720 * Requested by Felix Obenhuber <felix@obenhuber.de>. 721 */ 722 #define LINKTYPE_CAN_SOCKETCAN 227 723 724 /* 725 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies 726 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>. 727 */ 728 #define LINKTYPE_IPV4 228 729 #define LINKTYPE_IPV6 229 730 731 732 static struct linktype_map { 733 int dlt; 734 int linktype; 735 } map[] = { 736 /* 737 * These DLT_* codes have LINKTYPE_* codes with values identical 738 * to the values of the corresponding DLT_* code. 739 */ 740 { DLT_NULL, LINKTYPE_NULL }, 741 { DLT_EN10MB, LINKTYPE_ETHERNET }, 742 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 743 { DLT_AX25, LINKTYPE_AX25 }, 744 { DLT_PRONET, LINKTYPE_PRONET }, 745 { DLT_CHAOS, LINKTYPE_CHAOS }, 746 { DLT_IEEE802, LINKTYPE_TOKEN_RING }, 747 { DLT_ARCNET, LINKTYPE_ARCNET }, 748 { DLT_SLIP, LINKTYPE_SLIP }, 749 { DLT_PPP, LINKTYPE_PPP }, 750 { DLT_FDDI, LINKTYPE_FDDI }, 751 752 /* 753 * These DLT_* codes have different values on different 754 * platforms; we map them to LINKTYPE_* codes that 755 * have values that should never be equal to any DLT_* 756 * code. 757 */ 758 #ifdef DLT_FR 759 /* BSD/OS Frame Relay */ 760 { DLT_FR, LINKTYPE_FRELAY }, 761 #endif 762 763 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 764 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 765 { DLT_RAW, LINKTYPE_RAW }, 766 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 767 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 768 769 /* BSD/OS Cisco HDLC */ 770 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 771 772 /* 773 * These DLT_* codes are not on all platforms, but, so far, 774 * there don't appear to be any platforms that define 775 * other codes with those values; we map them to 776 * different LINKTYPE_* values anyway, just in case. 777 */ 778 779 /* Linux ATM Classical IP */ 780 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 781 782 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 783 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 784 785 /* NetBSD PPP over Ethernet */ 786 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 787 788 /* IEEE 802.11 wireless */ 789 { DLT_IEEE802_11, LINKTYPE_IEEE802_11 }, 790 791 /* Frame Relay */ 792 { DLT_FRELAY, LINKTYPE_FRELAY }, 793 794 /* OpenBSD loopback */ 795 { DLT_LOOP, LINKTYPE_LOOP }, 796 797 /* OpenBSD IPSEC enc */ 798 { DLT_ENC, LINKTYPE_ENC }, 799 800 /* Linux cooked socket capture */ 801 { DLT_LINUX_SLL, LINKTYPE_LINUX_SLL }, 802 803 /* Apple LocalTalk hardware */ 804 { DLT_LTALK, LINKTYPE_LTALK }, 805 806 /* Acorn Econet */ 807 { DLT_ECONET, LINKTYPE_ECONET }, 808 809 /* OpenBSD DLT_PFLOG */ 810 { DLT_PFLOG, LINKTYPE_PFLOG }, 811 812 /* For Cisco-internal use */ 813 { DLT_CISCO_IOS, LINKTYPE_CISCO_IOS }, 814 815 /* Prism II monitor-mode header plus 802.11 header */ 816 { DLT_PRISM_HEADER, LINKTYPE_PRISM_HEADER }, 817 818 /* FreeBSD Aironet driver stuff */ 819 { DLT_AIRONET_HEADER, LINKTYPE_AIRONET_HEADER }, 820 821 /* Siemens HiPath HDLC */ 822 { DLT_HHDLC, LINKTYPE_HHDLC }, 823 824 /* RFC 2625 IP-over-Fibre Channel */ 825 { DLT_IP_OVER_FC, LINKTYPE_IP_OVER_FC }, 826 827 /* Solaris+SunATM */ 828 { DLT_SUNATM, LINKTYPE_SUNATM }, 829 830 /* RapidIO */ 831 { DLT_RIO, LINKTYPE_RIO }, 832 833 /* PCI Express */ 834 { DLT_PCI_EXP, LINKTYPE_PCI_EXP }, 835 836 /* Xilinx Aurora link layer */ 837 { DLT_AURORA, LINKTYPE_AURORA }, 838 839 /* 802.11 plus BSD radio header */ 840 { DLT_IEEE802_11_RADIO, LINKTYPE_IEEE802_11_RADIO }, 841 842 /* Tazmen Sniffer Protocol */ 843 { DLT_TZSP, LINKTYPE_TZSP }, 844 845 /* Arcnet with Linux-style link-layer headers */ 846 { DLT_ARCNET_LINUX, LINKTYPE_ARCNET_LINUX }, 847 848 /* Juniper-internal chassis encapsulation */ 849 { DLT_JUNIPER_MLPPP, LINKTYPE_JUNIPER_MLPPP }, 850 { DLT_JUNIPER_MLFR, LINKTYPE_JUNIPER_MLFR }, 851 { DLT_JUNIPER_ES, LINKTYPE_JUNIPER_ES }, 852 { DLT_JUNIPER_GGSN, LINKTYPE_JUNIPER_GGSN }, 853 { DLT_JUNIPER_MFR, LINKTYPE_JUNIPER_MFR }, 854 { DLT_JUNIPER_ATM2, LINKTYPE_JUNIPER_ATM2 }, 855 { DLT_JUNIPER_SERVICES, LINKTYPE_JUNIPER_SERVICES }, 856 { DLT_JUNIPER_ATM1, LINKTYPE_JUNIPER_ATM1 }, 857 858 /* Apple IP-over-IEEE 1394 cooked header */ 859 { DLT_APPLE_IP_OVER_IEEE1394, LINKTYPE_APPLE_IP_OVER_IEEE1394 }, 860 861 /* SS7 */ 862 { DLT_MTP2_WITH_PHDR, LINKTYPE_MTP2_WITH_PHDR }, 863 { DLT_MTP2, LINKTYPE_MTP2 }, 864 { DLT_MTP3, LINKTYPE_MTP3 }, 865 { DLT_SCCP, LINKTYPE_SCCP }, 866 867 /* DOCSIS MAC frames */ 868 { DLT_DOCSIS, LINKTYPE_DOCSIS }, 869 870 /* IrDA IrLAP packets + Linux-cooked header */ 871 { DLT_LINUX_IRDA, LINKTYPE_LINUX_IRDA }, 872 873 /* IBM SP and Next Federation switches */ 874 { DLT_IBM_SP, LINKTYPE_IBM_SP }, 875 { DLT_IBM_SN, LINKTYPE_IBM_SN }, 876 877 /* 802.11 plus AVS radio header */ 878 { DLT_IEEE802_11_RADIO_AVS, LINKTYPE_IEEE802_11_RADIO_AVS }, 879 880 /* 881 * Any platform that defines additional DLT_* codes should: 882 * 883 * request a LINKTYPE_* code and value from tcpdump.org, 884 * as per the above; 885 * 886 * add, in their version of libpcap, an entry to map 887 * those DLT_* codes to the corresponding LINKTYPE_* 888 * code; 889 * 890 * redefine, in their "net/bpf.h", any DLT_* values 891 * that collide with the values used by their additional 892 * DLT_* codes, to remove those collisions (but without 893 * making them collide with any of the LINKTYPE_* 894 * values equal to 50 or above; they should also avoid 895 * defining DLT_* values that collide with those 896 * LINKTYPE_* values, either). 897 */ 898 899 /* Juniper-internal chassis encapsulation */ 900 { DLT_JUNIPER_MONITOR, LINKTYPE_JUNIPER_MONITOR }, 901 902 /* BACnet MS/TP */ 903 { DLT_BACNET_MS_TP, LINKTYPE_BACNET_MS_TP }, 904 905 /* PPP for pppd, with direction flag in the PPP header */ 906 { DLT_PPP_PPPD, LINKTYPE_PPP_PPPD}, 907 908 /* Juniper-internal chassis encapsulation */ 909 { DLT_JUNIPER_PPPOE, LINKTYPE_JUNIPER_PPPOE }, 910 { DLT_JUNIPER_PPPOE_ATM,LINKTYPE_JUNIPER_PPPOE_ATM }, 911 912 /* GPRS LLC */ 913 { DLT_GPRS_LLC, LINKTYPE_GPRS_LLC }, 914 915 /* Transparent Generic Framing Procedure (ITU-T G.7041/Y.1303) */ 916 { DLT_GPF_T, LINKTYPE_GPF_T }, 917 918 /* Framed Generic Framing Procedure (ITU-T G.7041/Y.1303) */ 919 { DLT_GPF_F, LINKTYPE_GPF_F }, 920 921 { DLT_GCOM_T1E1, LINKTYPE_GCOM_T1E1 }, 922 { DLT_GCOM_SERIAL, LINKTYPE_GCOM_SERIAL }, 923 924 /* Juniper-internal chassis encapsulation */ 925 { DLT_JUNIPER_PIC_PEER, LINKTYPE_JUNIPER_PIC_PEER }, 926 927 /* Endace types */ 928 { DLT_ERF_ETH, LINKTYPE_ERF_ETH }, 929 { DLT_ERF_POS, LINKTYPE_ERF_POS }, 930 931 /* viSDN LAPD */ 932 { DLT_LINUX_LAPD, LINKTYPE_LINUX_LAPD }, 933 934 /* Juniper meta-information before Ether, PPP, Frame Relay, C-HDLC Frames */ 935 { DLT_JUNIPER_ETHER, LINKTYPE_JUNIPER_ETHER }, 936 { DLT_JUNIPER_PPP, LINKTYPE_JUNIPER_PPP }, 937 { DLT_JUNIPER_FRELAY, LINKTYPE_JUNIPER_FRELAY }, 938 { DLT_JUNIPER_CHDLC, LINKTYPE_JUNIPER_CHDLC }, 939 940 /* Multi Link Frame Relay (FRF.16) */ 941 { DLT_MFR, LINKTYPE_MFR }, 942 943 /* Juniper Voice PIC */ 944 { DLT_JUNIPER_VP, LINKTYPE_JUNIPER_VP }, 945 946 /* Controller Area Network (CAN) v2.0B */ 947 { DLT_A429, LINKTYPE_A429 }, 948 949 /* Arinc 653 Interpartition Communication messages */ 950 { DLT_A653_ICM, LINKTYPE_A653_ICM }, 951 952 /* USB */ 953 { DLT_USB, LINKTYPE_USB }, 954 955 /* Bluetooth HCI UART transport layer */ 956 { DLT_BLUETOOTH_HCI_H4, LINKTYPE_BLUETOOTH_HCI_H4 }, 957 958 /* IEEE 802.16 MAC Common Part Sublayer */ 959 { DLT_IEEE802_16_MAC_CPS, LINKTYPE_IEEE802_16_MAC_CPS }, 960 961 /* USB with Linux header */ 962 { DLT_USB_LINUX, LINKTYPE_USB_LINUX }, 963 964 /* Controller Area Network (CAN) v2.0B */ 965 { DLT_CAN20B, LINKTYPE_CAN20B }, 966 967 /* IEEE 802.15.4 with address fields padded */ 968 { DLT_IEEE802_15_4_LINUX, LINKTYPE_IEEE802_15_4_LINUX }, 969 970 /* Per Packet Information encapsulated packets */ 971 { DLT_PPI, LINKTYPE_PPI }, 972 973 /* IEEE 802.16 MAC Common Part Sublayer plus radiotap header */ 974 { DLT_IEEE802_16_MAC_CPS_RADIO, LINKTYPE_IEEE802_16_MAC_CPS_RADIO }, 975 976 /* Juniper Voice ISM */ 977 { DLT_JUNIPER_ISM, LINKTYPE_JUNIPER_ISM }, 978 979 /* IEEE 802.15.4 exactly as it appears in the spec */ 980 { DLT_IEEE802_15_4, LINKTYPE_IEEE802_15_4 }, 981 982 /* Various link-layer types for SITA */ 983 { DLT_SITA, LINKTYPE_SITA }, 984 985 /* Various link-layer types for Endace */ 986 { DLT_ERF, LINKTYPE_ERF }, 987 988 /* Special header for u10 Networks boards */ 989 { DLT_RAIF1, LINKTYPE_RAIF1 }, 990 991 /* IPMB */ 992 { DLT_IPMB, LINKTYPE_IPMB }, 993 994 /* Juniper Secure Tunnel */ 995 { DLT_JUNIPER_ST, LINKTYPE_JUNIPER_ST }, 996 997 /* Bluetooth HCI UART transport layer, with pseudo-header */ 998 { DLT_BLUETOOTH_HCI_H4_WITH_PHDR, LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR }, 999 1000 /* AX.25 with KISS header */ 1001 { DLT_AX25_KISS, LINKTYPE_AX25_KISS }, 1002 1003 /* Raw LAPD, with no pseudo-header */ 1004 { DLT_LAPD, LINKTYPE_LAPD }, 1005 1006 /* PPP with one-byte pseudo-header giving direction */ 1007 { DLT_PPP_WITH_DIR, LINKTYPE_PPP_WITH_DIR }, 1008 1009 /* Cisco HDLC with one-byte pseudo-header giving direction */ 1010 { DLT_C_HDLC_WITH_DIR, LINKTYPE_C_HDLC_WITH_DIR }, 1011 1012 /* Frame Relay with one-byte pseudo-header giving direction */ 1013 { DLT_FRELAY_WITH_DIR, LINKTYPE_FRELAY_WITH_DIR }, 1014 1015 /* LAPB with one-byte pseudo-header giving direction */ 1016 { DLT_LAPB_WITH_DIR, LINKTYPE_LAPB_WITH_DIR }, 1017 1018 /* IPMB with Linux pseudo-header */ 1019 { DLT_IPMB_LINUX, LINKTYPE_IPMB_LINUX }, 1020 1021 /* FlexRay */ 1022 { DLT_FLEXRAY, LINKTYPE_FLEXRAY }, 1023 1024 /* MOST */ 1025 { DLT_MOST, LINKTYPE_MOST }, 1026 1027 /* LIN */ 1028 { DLT_LIN, LINKTYPE_LIN }, 1029 1030 /* X2E-private serial line capture */ 1031 { DLT_X2E_SERIAL, LINKTYPE_X2E_SERIAL }, 1032 1033 /* X2E-private for Xoraya data logger family */ 1034 { DLT_X2E_XORAYA, LINKTYPE_X2E_XORAYA }, 1035 1036 /* IEEE 802.15.4 with PHY data for non-ASK PHYs */ 1037 { DLT_IEEE802_15_4_NONASK_PHY, LINKTYPE_IEEE802_15_4_NONASK_PHY }, 1038 1039 /* Input device events from Linux /dev/input/eventN devices */ 1040 { DLT_LINUX_EVDEV, LINKTYPE_LINUX_EVDEV }, 1041 1042 /* GSM types */ 1043 { DLT_GSMTAP_UM, LINKTYPE_GSMTAP_UM }, 1044 { DLT_GSMTAP_ABIS, LINKTYPE_GSMTAP_ABIS }, 1045 1046 /* MPLS, with an MPLS label as the link-layer header */ 1047 { DLT_MPLS, LINKTYPE_MPLS }, 1048 1049 /* USB with padded Linux header */ 1050 { DLT_USB_LINUX_MMAPPED, LINKTYPE_USB_LINUX_MMAPPED }, 1051 1052 /* DECT packets with a pseudo-header */ 1053 { DLT_DECT, LINKTYPE_DECT }, 1054 1055 /* AOS Space Data Link Protocol */ 1056 { DLT_AOS, LINKTYPE_AOS }, 1057 1058 /* Wireless HART */ 1059 { DLT_WIHART, LINKTYPE_WIHART }, 1060 1061 /* Fibre Channel FC-2 frames without SOF or EOF */ 1062 { DLT_FC_2, LINKTYPE_FC_2 }, 1063 1064 /* Fibre Channel FC-2 frames with SOF and EOF */ 1065 { DLT_FC_2_WITH_FRAME_DELIMS, LINKTYPE_FC_2_WITH_FRAME_DELIMS }, 1066 1067 /* Solaris IPNET */ 1068 { DLT_IPNET, LINKTYPE_IPNET }, 1069 1070 /* CAN frames with SocketCAN headers */ 1071 { DLT_CAN_SOCKETCAN, LINKTYPE_CAN_SOCKETCAN }, 1072 1073 /* Raw IPv4/IPv6 */ 1074 { DLT_IPV4, LINKTYPE_IPV4 }, 1075 { DLT_IPV6, LINKTYPE_IPV6 }, 1076 1077 { -1, -1 } 1078 }; 1079 1080 int 1081 dlt_to_linktype(int dlt) 1082 { 1083 int i; 1084 1085 for (i = 0; map[i].dlt != -1; i++) { 1086 if (map[i].dlt == dlt) 1087 return (map[i].linktype); 1088 } 1089 1090 /* 1091 * If we don't have a mapping for this DLT_ code, return an 1092 * error; that means that the table above needs to have an 1093 * entry added. 1094 */ 1095 return (-1); 1096 } 1097 1098 int 1099 linktype_to_dlt(int linktype) 1100 { 1101 int i; 1102 1103 for (i = 0; map[i].linktype != -1; i++) { 1104 if (map[i].linktype == linktype) 1105 return (map[i].dlt); 1106 } 1107 1108 /* 1109 * If we don't have an entry for this link type, return 1110 * the link type value; it may be a DLT_ value from an 1111 * older version of libpcap. 1112 */ 1113 return linktype; 1114 } 1115 1116 /* 1117 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1118 * byte order when capturing (it's supplied directly from a 1119 * memory-mapped buffer shared by the kernel). 1120 * 1121 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1122 * we need to convert it from the capturing host's byte order to 1123 * the reading host's byte order. 1124 */ 1125 void 1126 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1127 int header_len_64_bytes) 1128 { 1129 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1130 1131 /* 1132 * The URB id is a totally opaque value; do we really need to 1133 * convert it to the reading host's byte order??? 1134 */ 1135 if (hdr->caplen < 8) 1136 return; 1137 uhdr->id = SWAPLL(uhdr->id); 1138 if (hdr->caplen < 14) 1139 return; 1140 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1141 if (hdr->caplen < 24) 1142 return; 1143 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1144 if (hdr->caplen < 28) 1145 return; 1146 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1147 if (hdr->caplen < 32) 1148 return; 1149 uhdr->status = SWAPLONG(uhdr->status); 1150 if (hdr->caplen < 36) 1151 return; 1152 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1153 if (hdr->caplen < 40) 1154 return; 1155 uhdr->data_len = SWAPLONG(uhdr->data_len); 1156 1157 if (header_len_64_bytes) { 1158 /* 1159 * This is either the "version 1" header, with 1160 * 16 bytes of additional fields at the end, or 1161 * a "version 0" header from a memory-mapped 1162 * capture, with 16 bytes of zeroed-out padding 1163 * at the end. Byte swap them as if this were 1164 * a "version 1" header. 1165 */ 1166 if (hdr->caplen < 52) 1167 return; 1168 uhdr->interval = SWAPLONG(uhdr->interval); 1169 if (hdr->caplen < 56) 1170 return; 1171 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1172 if (hdr->caplen < 60) 1173 return; 1174 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1175 if (hdr->caplen < 64) 1176 return; 1177 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1178 } 1179 } 1180