1 /* $NetBSD: pcap-common.c,v 1.4 2015/08/28 11:20:55 joerg Exp $ */ 2 3 /* 4 * Copyright (c) 1993, 1994, 1995, 1996, 1997 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that: (1) source code distributions 9 * retain the above copyright notice and this paragraph in its entirety, (2) 10 * distributions including binary code include the above copyright notice and 11 * this paragraph in its entirety in the documentation or other materials 12 * provided with the distribution, and (3) all advertising materials mentioning 13 * features or use of this software display the following acknowledgement: 14 * ``This product includes software developed by the University of California, 15 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 16 * the University nor the names of its contributors may be used to endorse 17 * or promote products derived from this software without specific prior 18 * written permission. 19 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 20 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 22 * 23 * pcap-common.c - common code for pcap and pcap-ng files 24 */ 25 26 #include <sys/cdefs.h> 27 __RCSID("$NetBSD: pcap-common.c,v 1.4 2015/08/28 11:20:55 joerg Exp $"); 28 29 #ifdef HAVE_CONFIG_H 30 #include "config.h" 31 #endif 32 33 #ifdef WIN32 34 #include <pcap-stdinc.h> 35 #else /* WIN32 */ 36 #if HAVE_INTTYPES_H 37 #include <inttypes.h> 38 #elif HAVE_STDINT_H 39 #include <stdint.h> 40 #endif 41 #ifdef HAVE_SYS_BITYPES_H 42 #include <sys/bitypes.h> 43 #endif 44 #include <sys/types.h> 45 #endif /* WIN32 */ 46 47 #include "pcap-int.h" 48 #include "pcap/usb.h" 49 #include "pcap/nflog.h" 50 51 #include "pcap-common.h" 52 53 /* 54 * We don't write DLT_* values to capture files, because they're not the 55 * same on all platforms. 56 * 57 * Unfortunately, the various flavors of BSD have not always used the same 58 * numerical values for the same data types, and various patches to 59 * libpcap for non-BSD OSes have added their own DLT_* codes for link 60 * layer encapsulation types seen on those OSes, and those codes have had, 61 * in some cases, values that were also used, on other platforms, for other 62 * link layer encapsulation types. 63 * 64 * This means that capture files of a type whose numerical DLT_* code 65 * means different things on different BSDs, or with different versions 66 * of libpcap, can't always be read on systems other than those like 67 * the one running on the machine on which the capture was made. 68 * 69 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 70 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 71 * codes to DLT_* codes when reading a savefile header. 72 * 73 * For those DLT_* codes that have, as far as we know, the same values on 74 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 75 * DLT_xxx; that way, captures of those types can still be read by 76 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 77 * captures of those types written by versions of libpcap that map DLT_ 78 * values to LINKTYPE_ values can still be read by older versions 79 * of libpcap. 80 * 81 * The other LINKTYPE_* codes are given values starting at 100, in the 82 * hopes that no DLT_* code will be given one of those values. 83 * 84 * In order to ensure that a given LINKTYPE_* code's value will refer to 85 * the same encapsulation type on all platforms, you should not allocate 86 * a new LINKTYPE_* value without consulting 87 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will 88 * allocate a value for you, and will not subsequently allocate it to 89 * anybody else; that value will be added to the "pcap.h" in the 90 * tcpdump.org Git repository, so that a future libpcap release will 91 * include it. 92 * 93 * You should, if possible, also contribute patches to libpcap and tcpdump 94 * to handle the new encapsulation type, so that they can also be checked 95 * into the tcpdump.org Git repository and so that they will appear in 96 * future libpcap and tcpdump releases. 97 * 98 * Do *NOT* assume that any values after the largest value in this file 99 * are available; you might not have the most up-to-date version of this 100 * file, and new values after that one might have been assigned. Also, 101 * do *NOT* use any values below 100 - those might already have been 102 * taken by one (or more!) organizations. 103 * 104 * Any platform that defines additional DLT_* codes should: 105 * 106 * request a LINKTYPE_* code and value from tcpdump.org, 107 * as per the above; 108 * 109 * add, in their version of libpcap, an entry to map 110 * those DLT_* codes to the corresponding LINKTYPE_* 111 * code; 112 * 113 * redefine, in their "net/bpf.h", any DLT_* values 114 * that collide with the values used by their additional 115 * DLT_* codes, to remove those collisions (but without 116 * making them collide with any of the LINKTYPE_* 117 * values equal to 50 or above; they should also avoid 118 * defining DLT_* values that collide with those 119 * LINKTYPE_* values, either). 120 */ 121 #define LINKTYPE_NULL DLT_NULL 122 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 123 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 124 #define LINKTYPE_AX25 DLT_AX25 125 #define LINKTYPE_PRONET DLT_PRONET 126 #define LINKTYPE_CHAOS DLT_CHAOS 127 #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */ 128 #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */ 129 #define LINKTYPE_SLIP DLT_SLIP 130 #define LINKTYPE_PPP DLT_PPP 131 #define LINKTYPE_FDDI DLT_FDDI 132 133 /* 134 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 135 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 136 * field) at the beginning of the packet. 137 * 138 * This is for use when there is always such a header; the address field 139 * might be 0xff, for regular PPP, or it might be an address field for Cisco 140 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 141 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 142 * 143 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 144 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 145 * captures will be written out with a link type that NetBSD's tcpdump 146 * can read. 147 */ 148 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 149 150 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 151 152 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 153 154 /* 155 * These correspond to DLT_s that have different values on different 156 * platforms; we map between these values in capture files and 157 * the DLT_ values as returned by pcap_datalink() and passed to 158 * pcap_open_dead(). 159 */ 160 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 161 #define LINKTYPE_RAW 101 /* raw IP */ 162 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 163 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 164 165 /* 166 * Values starting with 104 are used for newly-assigned link-layer 167 * header type values; for those link-layer header types, the DLT_ 168 * value returned by pcap_datalink() and passed to pcap_open_dead(), 169 * and the LINKTYPE_ value that appears in capture files, are the 170 * same. 171 * 172 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX 173 * is the highest such value. 174 */ 175 #define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */ 176 177 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 178 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 179 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 180 #define LINKTYPE_FRELAY 107 /* Frame Relay */ 181 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 182 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 183 184 /* 185 * These three types are reserved for future use. 186 */ 187 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 188 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 189 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 190 191 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 192 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 193 #define LINKTYPE_ECONET 115 /* Acorn Econet */ 194 195 /* 196 * Reserved for use with OpenBSD ipfilter. 197 */ 198 #define LINKTYPE_IPFILTER 116 199 200 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 201 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 202 #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */ 203 #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */ 204 205 /* 206 * Reserved for Siemens HiPath HDLC. 207 */ 208 #define LINKTYPE_HHDLC 121 209 210 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 211 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 212 213 /* 214 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 215 * for private use. 216 */ 217 #define LINKTYPE_RIO 124 /* RapidIO */ 218 #define LINKTYPE_PCI_EXP 125 /* PCI Express */ 219 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 220 221 #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */ 222 223 /* 224 * Reserved for the TZSP encapsulation, as per request from 225 * Chris Waters <chris.waters@networkchemistry.com> 226 * TZSP is a generic encapsulation for any other link type, 227 * which includes a means to include meta-information 228 * with the packet, e.g. signal strength and channel 229 * for 802.11 packets. 230 */ 231 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 232 233 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 234 235 /* 236 * Juniper-private data link types, as per request from 237 * Hannes Gredler <hannes@juniper.net>. The corresponding 238 * DLT_s are used for passing on chassis-internal 239 * metainformation such as QOS profiles, etc.. 240 */ 241 #define LINKTYPE_JUNIPER_MLPPP 130 242 #define LINKTYPE_JUNIPER_MLFR 131 243 #define LINKTYPE_JUNIPER_ES 132 244 #define LINKTYPE_JUNIPER_GGSN 133 245 #define LINKTYPE_JUNIPER_MFR 134 246 #define LINKTYPE_JUNIPER_ATM2 135 247 #define LINKTYPE_JUNIPER_SERVICES 136 248 #define LINKTYPE_JUNIPER_ATM1 137 249 250 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 251 252 #define LINKTYPE_MTP2_WITH_PHDR 139 253 #define LINKTYPE_MTP2 140 254 #define LINKTYPE_MTP3 141 255 #define LINKTYPE_SCCP 142 256 257 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 258 259 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 260 261 /* 262 * Reserved for IBM SP switch and IBM Next Federation switch. 263 */ 264 #define LINKTYPE_IBM_SP 145 265 #define LINKTYPE_IBM_SN 146 266 267 /* 268 * Reserved for private use. If you have some link-layer header type 269 * that you want to use within your organization, with the capture files 270 * using that link-layer header type not ever be sent outside your 271 * organization, you can use these values. 272 * 273 * No libpcap release will use these for any purpose, nor will any 274 * tcpdump release use them, either. 275 * 276 * Do *NOT* use these in capture files that you expect anybody not using 277 * your private versions of capture-file-reading tools to read; in 278 * particular, do *NOT* use them in products, otherwise you may find that 279 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 280 * read capture files from your firewall/intrusion detection/traffic 281 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 282 * and you may also find that the developers of those applications will 283 * not accept patches to let them read those files. 284 * 285 * Also, do not use them if somebody might send you a capture using them 286 * for *their* private type and tools using them for *your* private type 287 * would have to read them. 288 * 289 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a 290 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use 291 * the type you're given. 292 */ 293 #define LINKTYPE_USER0 147 294 #define LINKTYPE_USER1 148 295 #define LINKTYPE_USER2 149 296 #define LINKTYPE_USER3 150 297 #define LINKTYPE_USER4 151 298 #define LINKTYPE_USER5 152 299 #define LINKTYPE_USER6 153 300 #define LINKTYPE_USER7 154 301 #define LINKTYPE_USER8 155 302 #define LINKTYPE_USER9 156 303 #define LINKTYPE_USER10 157 304 #define LINKTYPE_USER11 158 305 #define LINKTYPE_USER12 159 306 #define LINKTYPE_USER13 160 307 #define LINKTYPE_USER14 161 308 #define LINKTYPE_USER15 162 309 310 /* 311 * For future use with 802.11 captures - defined by AbsoluteValue 312 * Systems to store a number of bits of link-layer information 313 * including radio information: 314 * 315 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 316 */ 317 #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */ 318 319 /* 320 * Juniper-private data link type, as per request from 321 * Hannes Gredler <hannes@juniper.net>. The corresponding 322 * DLT_s are used for passing on chassis-internal 323 * metainformation such as QOS profiles, etc.. 324 */ 325 #define LINKTYPE_JUNIPER_MONITOR 164 326 327 /* 328 * BACnet MS/TP frames. 329 */ 330 #define LINKTYPE_BACNET_MS_TP 165 331 332 /* 333 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 334 * 335 * This is used in some OSes to allow a kernel socket filter to distinguish 336 * between incoming and outgoing packets, on a socket intended to 337 * supply pppd with outgoing packets so it can do dial-on-demand and 338 * hangup-on-lack-of-demand; incoming packets are filtered out so they 339 * don't cause pppd to hold the connection up (you don't want random 340 * input packets such as port scans, packets from old lost connections, 341 * etc. to force the connection to stay up). 342 * 343 * The first byte of the PPP header (0xff03) is modified to accomodate 344 * the direction - 0x00 = IN, 0x01 = OUT. 345 */ 346 #define LINKTYPE_PPP_PPPD 166 347 348 /* 349 * Juniper-private data link type, as per request from 350 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 351 * for passing on chassis-internal metainformation such as 352 * QOS profiles, cookies, etc.. 353 */ 354 #define LINKTYPE_JUNIPER_PPPOE 167 355 #define LINKTYPE_JUNIPER_PPPOE_ATM 168 356 357 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 358 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 359 #define LINKTYPE_GPF_F 171 /* GPF-T (ITU-T G.7041/Y.1303) */ 360 361 /* 362 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 363 * monitoring equipment. 364 */ 365 #define LINKTYPE_GCOM_T1E1 172 366 #define LINKTYPE_GCOM_SERIAL 173 367 368 /* 369 * Juniper-private data link type, as per request from 370 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 371 * for internal communication to Physical Interface Cards (PIC) 372 */ 373 #define LINKTYPE_JUNIPER_PIC_PEER 174 374 375 /* 376 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 377 * Measurement Systems. They add an ERF header (see 378 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 379 * the link-layer header. 380 */ 381 #define LINKTYPE_ERF_ETH 175 /* Ethernet */ 382 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 383 384 /* 385 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 386 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 387 * includes additional information before the LAPD header, so it's 388 * not necessarily a generic LAPD header. 389 */ 390 #define LINKTYPE_LINUX_LAPD 177 391 392 /* 393 * Juniper-private data link type, as per request from 394 * Hannes Gredler <hannes@juniper.net>. 395 * The Link Types are used for prepending meta-information 396 * like interface index, interface name 397 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 398 */ 399 #define LINKTYPE_JUNIPER_ETHER 178 400 #define LINKTYPE_JUNIPER_PPP 179 401 #define LINKTYPE_JUNIPER_FRELAY 180 402 #define LINKTYPE_JUNIPER_CHDLC 181 403 404 /* 405 * Multi Link Frame Relay (FRF.16) 406 */ 407 #define LINKTYPE_MFR 182 408 409 /* 410 * Juniper-private data link type, as per request from 411 * Hannes Gredler <hannes@juniper.net>. 412 * The DLT_ is used for internal communication with a 413 * voice Adapter Card (PIC) 414 */ 415 #define LINKTYPE_JUNIPER_VP 183 416 417 /* 418 * Arinc 429 frames. 419 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 420 * Every frame contains a 32bit A429 label. 421 * More documentation on Arinc 429 can be found at 422 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 423 */ 424 #define LINKTYPE_A429 184 425 426 /* 427 * Arinc 653 Interpartition Communication messages. 428 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 429 * Please refer to the A653-1 standard for more information. 430 */ 431 #define LINKTYPE_A653_ICM 185 432 433 /* 434 * USB packets, beginning with a USB setup header; requested by 435 * Paolo Abeni <paolo.abeni@email.it>. 436 */ 437 #define LINKTYPE_USB 186 438 439 /* 440 * Bluetooth HCI UART transport layer (part H:4); requested by 441 * Paolo Abeni. 442 */ 443 #define LINKTYPE_BLUETOOTH_HCI_H4 187 444 445 /* 446 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz 447 * <cruz_petagay@bah.com>. 448 */ 449 #define LINKTYPE_IEEE802_16_MAC_CPS 188 450 451 /* 452 * USB packets, beginning with a Linux USB header; requested by 453 * Paolo Abeni <paolo.abeni@email.it>. 454 */ 455 #define LINKTYPE_USB_LINUX 189 456 457 /* 458 * Controller Area Network (CAN) v. 2.0B packets. 459 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 460 * Used to dump CAN packets coming from a CAN Vector board. 461 * More documentation on the CAN v2.0B frames can be found at 462 * http://www.can-cia.org/downloads/?269 463 */ 464 #define LINKTYPE_CAN20B 190 465 466 /* 467 * IEEE 802.15.4, with address fields padded, as is done by Linux 468 * drivers; requested by Juergen Schimmer. 469 */ 470 #define LINKTYPE_IEEE802_15_4_LINUX 191 471 472 /* 473 * Per Packet Information encapsulated packets. 474 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 475 */ 476 #define LINKTYPE_PPI 192 477 478 /* 479 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; 480 * requested by Charles Clancy. 481 */ 482 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 483 484 /* 485 * Juniper-private data link type, as per request from 486 * Hannes Gredler <hannes@juniper.net>. 487 * The DLT_ is used for internal communication with a 488 * integrated service module (ISM). 489 */ 490 #define LINKTYPE_JUNIPER_ISM 194 491 492 /* 493 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 494 * nothing); requested by Mikko Saarnivala <mikko.saarnivala@sensinode.com>. 495 */ 496 #define LINKTYPE_IEEE802_15_4 195 497 498 /* 499 * Various link-layer types, with a pseudo-header, for SITA 500 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). 501 */ 502 #define LINKTYPE_SITA 196 503 504 /* 505 * Various link-layer types, with a pseudo-header, for Endace DAG cards; 506 * encapsulates Endace ERF records. Requested by Stephen Donnelly 507 * <stephen@endace.com>. 508 */ 509 #define LINKTYPE_ERF 197 510 511 /* 512 * Special header prepended to Ethernet packets when capturing from a 513 * u10 Networks board. Requested by Phil Mulholland 514 * <phil@u10networks.com>. 515 */ 516 #define LINKTYPE_RAIF1 198 517 518 /* 519 * IPMB packet for IPMI, beginning with the I2C slave address, followed 520 * by the netFn and LUN, etc.. Requested by Chanthy Toeung 521 * <chanthy.toeung@ca.kontron.com>. 522 */ 523 #define LINKTYPE_IPMB 199 524 525 /* 526 * Juniper-private data link type, as per request from 527 * Hannes Gredler <hannes@juniper.net>. 528 * The DLT_ is used for capturing data on a secure tunnel interface. 529 */ 530 #define LINKTYPE_JUNIPER_ST 200 531 532 /* 533 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header 534 * that includes direction information; requested by Paolo Abeni. 535 */ 536 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 537 538 /* 539 * AX.25 packet with a 1-byte KISS header; see 540 * 541 * http://www.ax25.net/kiss.htm 542 * 543 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>. 544 */ 545 #define LINKTYPE_AX25_KISS 202 546 547 /* 548 * LAPD packets from an ISDN channel, starting with the address field, 549 * with no pseudo-header. 550 * Requested by Varuna De Silva <varunax@gmail.com>. 551 */ 552 #define LINKTYPE_LAPD 203 553 554 /* 555 * Variants of various link-layer headers, with a one-byte direction 556 * pseudo-header prepended - zero means "received by this host", 557 * non-zero (any non-zero value) means "sent by this host" - as per 558 * Will Barker <w.barker@zen.co.uk>. 559 */ 560 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */ 561 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ 562 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ 563 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ 564 565 /* 566 * 208 is reserved for an as-yet-unspecified proprietary link-layer 567 * type, as requested by Will Barker. 568 */ 569 570 /* 571 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman 572 * <avn@pigeonpoint.com>. 573 */ 574 #define LINKTYPE_IPMB_LINUX 209 575 576 /* 577 * FlexRay automotive bus - http://www.flexray.com/ - as requested 578 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 579 */ 580 #define LINKTYPE_FLEXRAY 210 581 582 /* 583 * Media Oriented Systems Transport (MOST) bus for multimedia 584 * transport - http://www.mostcooperation.com/ - as requested 585 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 586 */ 587 #define LINKTYPE_MOST 211 588 589 /* 590 * Local Interconnect Network (LIN) bus for vehicle networks - 591 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber 592 * <hannes.kaelber@x2e.de>. 593 */ 594 #define LINKTYPE_LIN 212 595 596 /* 597 * X2E-private data link type used for serial line capture, 598 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 599 */ 600 #define LINKTYPE_X2E_SERIAL 213 601 602 /* 603 * X2E-private data link type used for the Xoraya data logger 604 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 605 */ 606 #define LINKTYPE_X2E_XORAYA 214 607 608 /* 609 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 610 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets 611 * of 0 as preamble, one octet of SFD, one octet of frame length+ 612 * reserved bit, and then the MAC-layer data, starting with the 613 * frame control field). 614 * 615 * Requested by Max Filippov <jcmvbkbc@gmail.com>. 616 */ 617 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 618 619 /* 620 * David Gibson <david@gibson.dropbear.id.au> requested this for 621 * captures from the Linux kernel /dev/input/eventN devices. This 622 * is used to communicate keystrokes and mouse movements from the 623 * Linux kernel to display systems, such as Xorg. 624 */ 625 #define LINKTYPE_LINUX_EVDEV 216 626 627 /* 628 * GSM Um and Abis interfaces, preceded by a "gsmtap" header. 629 * 630 * Requested by Harald Welte <laforge@gnumonks.org>. 631 */ 632 #define LINKTYPE_GSMTAP_UM 217 633 #define LINKTYPE_GSMTAP_ABIS 218 634 635 /* 636 * MPLS, with an MPLS label as the link-layer header. 637 * Requested by Michele Marchetto <michele@openbsd.org> on behalf 638 * of OpenBSD. 639 */ 640 #define LINKTYPE_MPLS 219 641 642 /* 643 * USB packets, beginning with a Linux USB header, with the USB header 644 * padded to 64 bytes; required for memory-mapped access. 645 */ 646 #define LINKTYPE_USB_LINUX_MMAPPED 220 647 648 /* 649 * DECT packets, with a pseudo-header; requested by 650 * Matthias Wenzel <tcpdump@mazzoo.de>. 651 */ 652 #define LINKTYPE_DECT 221 653 654 /* 655 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov> 656 * Date: Mon, 11 May 2009 11:18:30 -0500 657 * 658 * DLT_AOS. We need it for AOS Space Data Link Protocol. 659 * I have already written dissectors for but need an OK from 660 * legal before I can submit a patch. 661 * 662 */ 663 #define LINKTYPE_AOS 222 664 665 /* 666 * Wireless HART (Highway Addressable Remote Transducer) 667 * From the HART Communication Foundation 668 * IES/PAS 62591 669 * 670 * Requested by Sam Roberts <vieuxtech@gmail.com>. 671 */ 672 #define LINKTYPE_WIHART 223 673 674 /* 675 * Fibre Channel FC-2 frames, beginning with a Frame_Header. 676 * Requested by Kahou Lei <kahou82@gmail.com>. 677 */ 678 #define LINKTYPE_FC_2 224 679 680 /* 681 * Fibre Channel FC-2 frames, beginning with an encoding of the 682 * SOF, and ending with an encoding of the EOF. 683 * 684 * The encodings represent the frame delimiters as 4-byte sequences 685 * representing the corresponding ordered sets, with K28.5 686 * represented as 0xBC, and the D symbols as the corresponding 687 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, 688 * is represented as 0xBC 0xB5 0x55 0x55. 689 * 690 * Requested by Kahou Lei <kahou82@gmail.com>. 691 */ 692 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 693 694 /* 695 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>. 696 * 697 * The pseudo-header starts with a one-byte version number; for version 2, 698 * the pseudo-header is: 699 * 700 * struct dl_ipnetinfo { 701 * u_int8_t dli_version; 702 * u_int8_t dli_family; 703 * u_int16_t dli_htype; 704 * u_int32_t dli_pktlen; 705 * u_int32_t dli_ifindex; 706 * u_int32_t dli_grifindex; 707 * u_int32_t dli_zsrc; 708 * u_int32_t dli_zdst; 709 * }; 710 * 711 * dli_version is 2 for the current version of the pseudo-header. 712 * 713 * dli_family is a Solaris address family value, so it's 2 for IPv4 714 * and 26 for IPv6. 715 * 716 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing 717 * packets, and 2 for packets arriving from another zone on the same 718 * machine. 719 * 720 * dli_pktlen is the length of the packet data following the pseudo-header 721 * (so the captured length minus dli_pktlen is the length of the 722 * pseudo-header, assuming the entire pseudo-header was captured). 723 * 724 * dli_ifindex is the interface index of the interface on which the 725 * packet arrived. 726 * 727 * dli_grifindex is the group interface index number (for IPMP interfaces). 728 * 729 * dli_zsrc is the zone identifier for the source of the packet. 730 * 731 * dli_zdst is the zone identifier for the destination of the packet. 732 * 733 * A zone number of 0 is the global zone; a zone number of 0xffffffff 734 * means that the packet arrived from another host on the network, not 735 * from another zone on the same machine. 736 * 737 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates 738 * which of those it is. 739 */ 740 #define LINKTYPE_IPNET 226 741 742 /* 743 * CAN (Controller Area Network) frames, with a pseudo-header as supplied 744 * by Linux SocketCAN. See Documentation/networking/can.txt in the Linux 745 * source. 746 * 747 * Requested by Felix Obenhuber <felix@obenhuber.de>. 748 */ 749 #define LINKTYPE_CAN_SOCKETCAN 227 750 751 /* 752 * Raw IPv4/IPv6; different from DLT_RAW in that the DLT_ value specifies 753 * whether it's v4 or v6. Requested by Darren Reed <Darren.Reed@Sun.COM>. 754 */ 755 #define LINKTYPE_IPV4 228 756 #define LINKTYPE_IPV6 229 757 758 /* 759 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 760 * nothing), and with no FCS at the end of the frame; requested by 761 * Jon Smirl <jonsmirl@gmail.com>. 762 */ 763 #define LINKTYPE_IEEE802_15_4_NOFCS 230 764 765 /* 766 * Raw D-Bus: 767 * 768 * http://www.freedesktop.org/wiki/Software/dbus 769 * 770 * messages: 771 * 772 * http://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages 773 * 774 * starting with the endianness flag, followed by the message type, etc., 775 * but without the authentication handshake before the message sequence: 776 * 777 * http://dbus.freedesktop.org/doc/dbus-specification.html#auth-protocol 778 * 779 * Requested by Martin Vidner <martin@vidner.net>. 780 */ 781 #define LINKTYPE_DBUS 231 782 783 /* 784 * Juniper-private data link type, as per request from 785 * Hannes Gredler <hannes@juniper.net>. 786 */ 787 #define LINKTYPE_JUNIPER_VS 232 788 #define LINKTYPE_JUNIPER_SRX_E2E 233 789 #define LINKTYPE_JUNIPER_FIBRECHANNEL 234 790 791 /* 792 * DVB-CI (DVB Common Interface for communication between a PC Card 793 * module and a DVB receiver). See 794 * 795 * http://www.kaiser.cx/pcap-dvbci.html 796 * 797 * for the specification. 798 * 799 * Requested by Martin Kaiser <martin@kaiser.cx>. 800 */ 801 #define LINKTYPE_DVB_CI 235 802 803 /* 804 * Variant of 3GPP TS 27.010 multiplexing protocol. Requested 805 * by Hans-Christoph Schemmel <hans-christoph.schemmel@cinterion.com>. 806 */ 807 #define LINKTYPE_MUX27010 236 808 809 /* 810 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray 811 * <barisdemiray@gmail.com>. 812 */ 813 #define LINKTYPE_STANAG_5066_D_PDU 237 814 815 /* 816 * Juniper-private data link type, as per request from 817 * Hannes Gredler <hannes@juniper.net>. 818 */ 819 #define LINKTYPE_JUNIPER_ATM_CEMIC 238 820 821 /* 822 * NetFilter LOG messages 823 * (payload of netlink NFNL_SUBSYS_ULOG/NFULNL_MSG_PACKET packets) 824 * 825 * Requested by Jakub Zawadzki <darkjames-ws@darkjames.pl> 826 */ 827 #define LINKTYPE_NFLOG 239 828 829 /* 830 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 831 * for Ethernet packets with a 4-byte pseudo-header and always 832 * with the payload including the FCS, as supplied by their 833 * netANALYZER hardware and software. 834 * 835 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 836 */ 837 #define LINKTYPE_NETANALYZER 240 838 839 /* 840 * Hilscher Gesellschaft fuer Systemautomation mbH link-layer type 841 * for Ethernet packets with a 4-byte pseudo-header and FCS and 842 * 1 byte of SFD, as supplied by their netANALYZER hardware and 843 * software. 844 * 845 * Requested by Holger P. Frommer <HPfrommer@hilscher.com> 846 */ 847 #define LINKTYPE_NETANALYZER_TRANSPARENT 241 848 849 /* 850 * IP-over-InfiniBand, as specified by RFC 4391. 851 * 852 * Requested by Petr Sumbera <petr.sumbera@oracle.com>. 853 */ 854 #define LINKTYPE_IPOIB 242 855 856 /* 857 * MPEG-2 transport stream (ISO 13818-1/ITU-T H.222.0). 858 * 859 * Requested by Guy Martin <gmsoft@tuxicoman.be>. 860 */ 861 #define LINKTYPE_MPEG_2_TS 243 862 863 /* 864 * ng4T GmbH's UMTS Iub/Iur-over-ATM and Iub/Iur-over-IP format as 865 * used by their ng40 protocol tester. 866 * 867 * Requested by Jens Grimmer <jens.grimmer@ng4t.com>. 868 */ 869 #define LINKTYPE_NG40 244 870 871 /* 872 * Pseudo-header giving adapter number and flags, followed by an NFC 873 * (Near-Field Communications) Logical Link Control Protocol (LLCP) PDU, 874 * as specified by NFC Forum Logical Link Control Protocol Technical 875 * Specification LLCP 1.1. 876 * 877 * Requested by Mike Wakerly <mikey@google.com>. 878 */ 879 #define LINKTYPE_NFC_LLCP 245 880 881 /* 882 * pfsync output; DLT_PFSYNC is 18, which collides with DLT_CIP in 883 * SuSE 6.3, on OpenBSD, NetBSD, DragonFly BSD, and Mac OS X, and 884 * is 121, which collides with DLT_HHDLC, in FreeBSD. We pick a 885 * shiny new link-layer header type value that doesn't collide with 886 * anything, in the hopes that future pfsync savefiles, if any, 887 * won't require special hacks to distinguish from other savefiles. 888 * 889 */ 890 #define LINKTYPE_PFSYNC 246 891 892 /* 893 * Raw InfiniBand packets, starting with the Local Routing Header. 894 * 895 * Requested by Oren Kladnitsky <orenk@mellanox.com>. 896 */ 897 #define LINKTYPE_INFINIBAND 247 898 899 /* 900 * SCTP, with no lower-level protocols (i.e., no IPv4 or IPv6). 901 * 902 * Requested by Michael Tuexen <Michael.Tuexen@lurchi.franken.de>. 903 */ 904 #define LINKTYPE_SCTP 248 905 906 /* 907 * USB packets, beginning with a USBPcap header. 908 * 909 * Requested by Tomasz Mon <desowin@gmail.com> 910 */ 911 #define LINKTYPE_USBPCAP 249 912 913 /* 914 * Schweitzer Engineering Laboratories "RTAC" product serial-line 915 * packets. 916 * 917 * Requested by Chris Bontje <chris_bontje@selinc.com>. 918 */ 919 #define DLT_RTAC_SERIAL 250 920 921 /* 922 * Bluetooth Low Energy air interface link-layer packets. 923 * 924 * Requested by Mike Kershaw <dragorn@kismetwireless.net>. 925 */ 926 #define LINKTYPE_BLUETOOTH_LE_LL 251 927 928 /* 929 * Link-layer header type for upper-protocol layer PDU saves from wireshark. 930 * 931 * the actual contents are determined by two TAGs stored with each 932 * packet: 933 * EXP_PDU_TAG_LINKTYPE the link type (LINKTYPE_ value) of the 934 * original packet. 935 * 936 * EXP_PDU_TAG_PROTO_NAME the name of the wireshark dissector 937 * that can make sense of the data stored. 938 */ 939 #define LINKTYPE_WIRESHARK_UPPER_PDU 252 940 941 /* 942 * Link-layer header type for the netlink protocol (nlmon devices). 943 */ 944 #define LINKTYPE_NETLINK 253 945 946 /* 947 * Bluetooth Linux Monitor headers for the BlueZ stack. 948 */ 949 #define LINKTYPE_BLUETOOTH_LINUX_MONITOR 254 950 951 /* 952 * Bluetooth Basic Rate/Enhanced Data Rate baseband packets, as 953 * captured by Ubertooth. 954 */ 955 #define LINKTYPE_BLUETOOTH_BREDR_BB 255 956 957 /* 958 * Bluetooth Low Energy link layer packets, as captured by Ubertooth. 959 */ 960 #define LINKTYPE_BLUETOOTH_LE_LL_WITH_PHDR 256 961 962 /* 963 * PROFIBUS data link layer. 964 */ 965 #define LINKTYPE_PROFIBUS_DL 257 966 967 968 /* 969 * Apple's DLT_PKTAP headers. 970 * 971 * Sadly, the folks at Apple either had no clue that the DLT_USERn values 972 * are for internal use within an organization and partners only, and 973 * didn't know that the right way to get a link-layer header type is to 974 * ask tcpdump.org for one, or knew and didn't care, so they just 975 * used DLT_USER2, which causes problems for everything except for 976 * their version of tcpdump. 977 * 978 * So I'll just give them one; hopefully this will show up in a 979 * libpcap release in time for them to get this into 10.10 Big Sur 980 * or whatever Mavericks' successor is called. LINKTYPE_PKTAP 981 * will be 258 *even on OS X*; that is *intentional*, so that 982 * PKTAP files look the same on *all* OSes (different OSes can have 983 * different numerical values for a given DLT_, but *MUST NOT* have 984 * different values for what goes in a file, as files can be moved 985 * between OSes!). 986 */ 987 #define LINKTYPE_PKTAP 258 988 989 /* 990 * Ethernet packets preceded by a header giving the last 6 octets 991 * of the preamble specified by 802.3-2012 Clause 65, section 992 * 65.1.3.2 "Transmit". 993 */ 994 #define LINKTYPE_EPON 259 995 996 /* 997 * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format" 998 * in the PICMG HPM.2 specification. 999 */ 1000 #define LINKTYPE_IPMI_HPM_2 260 1001 1002 /* 1003 * per Joshua Wright <jwright@hasborg.com>, formats for Zwave captures. 1004 */ 1005 #define LINKTYPE_ZWAVE_R1_R2 261 1006 #define LINKTYPE_ZWAVE_R3 262 1007 1008 #define LINKTYPE_MATCHING_MAX 262 /* highest value in the "matching" range */ 1009 1010 static struct linktype_map { 1011 int dlt; 1012 int linktype; 1013 } map[] = { 1014 /* 1015 * These DLT_* codes have LINKTYPE_* codes with values identical 1016 * to the values of the corresponding DLT_* code. 1017 */ 1018 { DLT_NULL, LINKTYPE_NULL }, 1019 { DLT_EN10MB, LINKTYPE_ETHERNET }, 1020 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 1021 { DLT_AX25, LINKTYPE_AX25 }, 1022 { DLT_PRONET, LINKTYPE_PRONET }, 1023 { DLT_CHAOS, LINKTYPE_CHAOS }, 1024 { DLT_IEEE802, LINKTYPE_IEEE802_5 }, 1025 { DLT_ARCNET, LINKTYPE_ARCNET_BSD }, 1026 { DLT_SLIP, LINKTYPE_SLIP }, 1027 { DLT_PPP, LINKTYPE_PPP }, 1028 { DLT_FDDI, LINKTYPE_FDDI }, 1029 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 1030 1031 /* 1032 * These DLT_* codes have different values on different 1033 * platforms; we map them to LINKTYPE_* codes that 1034 * have values that should never be equal to any DLT_* 1035 * code. 1036 */ 1037 #ifdef DLT_FR 1038 /* BSD/OS Frame Relay */ 1039 { DLT_FR, LINKTYPE_FRELAY }, 1040 #endif 1041 1042 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 1043 { DLT_RAW, LINKTYPE_RAW }, 1044 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 1045 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 1046 1047 /* BSD/OS Cisco HDLC */ 1048 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 1049 1050 /* 1051 * These DLT_* codes are not on all platforms, but, so far, 1052 * there don't appear to be any platforms that define 1053 * other codes with those values; we map them to 1054 * different LINKTYPE_* values anyway, just in case. 1055 */ 1056 1057 /* Linux ATM Classical IP */ 1058 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 1059 1060 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 1061 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 1062 1063 /* NetBSD PPP over Ethernet */ 1064 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 1065 1066 /* 1067 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN 1068 * and LINKTYPE_MATCHING_MAX are mapped to identical 1069 * DLT_ values. 1070 */ 1071 1072 { -1, -1 } 1073 }; 1074 1075 int 1076 dlt_to_linktype(int dlt) 1077 { 1078 int i; 1079 1080 /* 1081 * DLTs that, on some platforms, have values in the matching range 1082 * but that *don't* have the same value as the corresponding 1083 * LINKTYPE because, for some reason, not all OSes have the 1084 * same value for that DLT (note that the DLT's value might be 1085 * outside the matching range on some of those OSes). 1086 */ 1087 if (dlt == DLT_PFSYNC) 1088 return (LINKTYPE_PFSYNC); 1089 if (dlt == DLT_PKTAP) 1090 return (LINKTYPE_PKTAP); 1091 1092 /* 1093 * For all other values in the matching range, the DLT 1094 * value is the same as the LINKTYPE value. 1095 */ 1096 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX) 1097 return (dlt); 1098 1099 /* 1100 * Map the values outside that range. 1101 */ 1102 for (i = 0; map[i].dlt != -1; i++) { 1103 if (map[i].dlt == dlt) 1104 return (map[i].linktype); 1105 } 1106 1107 /* 1108 * If we don't have a mapping for this DLT, return an 1109 * error; that means that this is a value with no corresponding 1110 * LINKTYPE, and we need to assign one. 1111 */ 1112 return (-1); 1113 } 1114 1115 int 1116 linktype_to_dlt(int linktype) 1117 { 1118 int i; 1119 1120 /* 1121 * LINKTYPEs in the matching range that *don't* 1122 * have the same value as the corresponding DLTs 1123 * because, for some reason, not all OSes have the 1124 * same value for that DLT. 1125 */ 1126 if (linktype == LINKTYPE_PFSYNC) 1127 return (DLT_PFSYNC); 1128 if (linktype == LINKTYPE_PKTAP) 1129 return (DLT_PKTAP); 1130 1131 /* 1132 * For all other values in the matching range, the LINKTYPE 1133 * value is the same as the DLT value. 1134 */ 1135 if (linktype >= LINKTYPE_MATCHING_MIN && 1136 linktype <= LINKTYPE_MATCHING_MAX) 1137 return (linktype); 1138 1139 /* 1140 * Map the values outside that range. 1141 */ 1142 for (i = 0; map[i].linktype != -1; i++) { 1143 if (map[i].linktype == linktype) 1144 return (map[i].dlt); 1145 } 1146 1147 /* 1148 * If we don't have an entry for this LINKTYPE, return 1149 * the link type value; it may be a DLT from an older 1150 * version of libpcap. 1151 */ 1152 return linktype; 1153 } 1154 1155 /* 1156 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1157 * byte order when capturing (it's supplied directly from a 1158 * memory-mapped buffer shared by the kernel). 1159 * 1160 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1161 * we need to convert it from the byte order of the host that wrote 1162 * the file to this host's byte order. 1163 */ 1164 static void 1165 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1166 int header_len_64_bytes) 1167 { 1168 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1169 bpf_u_int32 offset = 0; 1170 1171 /* 1172 * "offset" is the offset *past* the field we're swapping; 1173 * we skip the field *before* checking to make sure 1174 * the captured data length includes the entire field. 1175 */ 1176 1177 /* 1178 * The URB id is a totally opaque value; do we really need to 1179 * convert it to the reading host's byte order??? 1180 */ 1181 offset += 8; /* skip past id */ 1182 if (hdr->caplen < offset) 1183 return; 1184 uhdr->id = SWAPLL(uhdr->id); 1185 1186 offset += 4; /* skip past various 1-byte fields */ 1187 1188 offset += 2; /* skip past bus_id */ 1189 if (hdr->caplen < offset) 1190 return; 1191 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1192 1193 offset += 2; /* skip past various 1-byte fields */ 1194 1195 offset += 8; /* skip past ts_sec */ 1196 if (hdr->caplen < offset) 1197 return; 1198 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1199 1200 offset += 4; /* skip past ts_usec */ 1201 if (hdr->caplen < offset) 1202 return; 1203 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1204 1205 offset += 4; /* skip past status */ 1206 if (hdr->caplen < offset) 1207 return; 1208 uhdr->status = SWAPLONG(uhdr->status); 1209 1210 offset += 4; /* skip past urb_len */ 1211 if (hdr->caplen < offset) 1212 return; 1213 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1214 1215 offset += 4; /* skip past data_len */ 1216 if (hdr->caplen < offset) 1217 return; 1218 uhdr->data_len = SWAPLONG(uhdr->data_len); 1219 1220 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1221 offset += 4; /* skip past s.iso.error_count */ 1222 if (hdr->caplen < offset) 1223 return; 1224 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count); 1225 1226 offset += 4; /* skip past s.iso.numdesc */ 1227 if (hdr->caplen < offset) 1228 return; 1229 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc); 1230 } else 1231 offset += 8; /* skip USB setup header */ 1232 1233 /* 1234 * With the old header, there are no isochronous descriptors 1235 * after the header. 1236 * 1237 * With the new header, the actual number of descriptors in 1238 * the header is not s.iso.numdesc, it's ndesc - only the 1239 * first N descriptors, for some value of N, are put into 1240 * the header, and ndesc is set to the actual number copied. 1241 * In addition, if s.iso.numdesc is negative, no descriptors 1242 * are captured, and ndesc is set to 0. 1243 */ 1244 if (header_len_64_bytes) { 1245 /* 1246 * This is either the "version 1" header, with 1247 * 16 bytes of additional fields at the end, or 1248 * a "version 0" header from a memory-mapped 1249 * capture, with 16 bytes of zeroed-out padding 1250 * at the end. Byte swap them as if this were 1251 * a "version 1" header. 1252 */ 1253 offset += 4; /* skip past interval */ 1254 if (hdr->caplen < offset) 1255 return; 1256 uhdr->interval = SWAPLONG(uhdr->interval); 1257 1258 offset += 4; /* skip past start_frame */ 1259 if (hdr->caplen < offset) 1260 return; 1261 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1262 1263 offset += 4; /* skip past xfer_flags */ 1264 if (hdr->caplen < offset) 1265 return; 1266 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1267 1268 offset += 4; /* skip past ndesc */ 1269 if (hdr->caplen < offset) 1270 return; 1271 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1272 1273 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1274 /* swap the values in struct linux_usb_isodesc */ 1275 usb_isodesc *pisodesc; 1276 u_int32_t i; 1277 1278 pisodesc = (usb_isodesc *)(void *)(buf+offset); 1279 for (i = 0; i < uhdr->ndesc; i++) { 1280 offset += 4; /* skip past status */ 1281 if (hdr->caplen < offset) 1282 return; 1283 pisodesc->status = SWAPLONG(pisodesc->status); 1284 1285 offset += 4; /* skip past offset */ 1286 if (hdr->caplen < offset) 1287 return; 1288 pisodesc->offset = SWAPLONG(pisodesc->offset); 1289 1290 offset += 4; /* skip past len */ 1291 if (hdr->caplen < offset) 1292 return; 1293 pisodesc->len = SWAPLONG(pisodesc->len); 1294 1295 offset += 4; /* skip past padding */ 1296 1297 pisodesc++; 1298 } 1299 } 1300 } 1301 } 1302 1303 /* 1304 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order 1305 * data. They begin with a fixed-length header with big-endian fields, 1306 * followed by a set of TLVs, where the type and length are in host 1307 * byte order but the values are either big-endian or are a raw byte 1308 * sequence that's the same regardless of the host's byte order. 1309 * 1310 * When reading a DLT_NFLOG capture file, we need to convert the type 1311 * and length values from the byte order of the host that wrote the 1312 * file to the byte order of this host. 1313 */ 1314 static void 1315 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf) 1316 { 1317 u_char *p = buf; 1318 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf; 1319 nflog_tlv_t *tlv; 1320 u_int caplen = hdr->caplen; 1321 u_int length = hdr->len; 1322 u_int16_t size; 1323 1324 if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) { 1325 /* Not enough data to have any TLVs. */ 1326 return; 1327 } 1328 1329 if (nfhdr->nflog_version != 0) { 1330 /* Unknown NFLOG version */ 1331 return; 1332 } 1333 1334 length -= sizeof(nflog_hdr_t); 1335 caplen -= sizeof(nflog_hdr_t); 1336 p += sizeof(nflog_hdr_t); 1337 1338 while (caplen >= sizeof(nflog_tlv_t)) { 1339 tlv = (nflog_tlv_t *) p; 1340 1341 /* Swap the type and length. */ 1342 tlv->tlv_type = SWAPSHORT(tlv->tlv_type); 1343 tlv->tlv_length = SWAPSHORT(tlv->tlv_length); 1344 1345 /* Get the length of the TLV. */ 1346 size = tlv->tlv_length; 1347 if (size % 4 != 0) 1348 size += 4 - size % 4; 1349 1350 /* Is the TLV's length less than the minimum? */ 1351 if (size < sizeof(nflog_tlv_t)) { 1352 /* Yes. Give up now. */ 1353 return; 1354 } 1355 1356 /* Do we have enough data for the full TLV? */ 1357 if (caplen < size || length < size) { 1358 /* No. */ 1359 return; 1360 } 1361 1362 /* Skip over the TLV. */ 1363 length -= size; 1364 caplen -= size; 1365 p += size; 1366 } 1367 } 1368 1369 void 1370 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data) 1371 { 1372 /* 1373 * Convert pseudo-headers from the byte order of 1374 * the host on which the file was saved to our 1375 * byte order, as necessary. 1376 */ 1377 switch (linktype) { 1378 1379 case DLT_USB_LINUX: 1380 swap_linux_usb_header(hdr, data, 0); 1381 break; 1382 1383 case DLT_USB_LINUX_MMAPPED: 1384 swap_linux_usb_header(hdr, data, 1); 1385 break; 1386 1387 case DLT_NFLOG: 1388 swap_nflog_header(hdr, data); 1389 break; 1390 } 1391 } 1392