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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) gmail.com>. 611 */ 612 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 613 614 /* 615 * David Gibson <david (at) 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 (at) 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 (at) 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 (at) mazzoo.de>. 646 */ 647 #define LINKTYPE_DECT 221 648 649 /* 650 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) vidner.net>. 775 */ 776 #define LINKTYPE_DBUS 231 777 778 /* 779 * Juniper-private data link type, as per request from 780 * Hannes Gredler <hannes (at) 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 (at) 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 (at) cinterion.com>. 801 */ 802 #define LINKTYPE_MUX27010 236 803 804 /* 805 * STANAG 5066 D_PDUs. Requested by M. Baris Demiray 806 * <barisdemiray (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 (at) 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 #define LINKTYPE_MATCHING_MAX 252 /* highest value in the "matching" range */ 937 938 static struct linktype_map { 939 int dlt; 940 int linktype; 941 } map[] = { 942 /* 943 * These DLT_* codes have LINKTYPE_* codes with values identical 944 * to the values of the corresponding DLT_* code. 945 */ 946 { DLT_NULL, LINKTYPE_NULL }, 947 { DLT_EN10MB, LINKTYPE_ETHERNET }, 948 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 949 { DLT_AX25, LINKTYPE_AX25 }, 950 { DLT_PRONET, LINKTYPE_PRONET }, 951 { DLT_CHAOS, LINKTYPE_CHAOS }, 952 { DLT_IEEE802, LINKTYPE_IEEE802_5 }, 953 { DLT_ARCNET, LINKTYPE_ARCNET_BSD }, 954 { DLT_SLIP, LINKTYPE_SLIP }, 955 { DLT_PPP, LINKTYPE_PPP }, 956 { DLT_FDDI, LINKTYPE_FDDI }, 957 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 958 959 /* 960 * These DLT_* codes have different values on different 961 * platforms; we map them to LINKTYPE_* codes that 962 * have values that should never be equal to any DLT_* 963 * code. 964 */ 965 #ifdef DLT_FR 966 /* BSD/OS Frame Relay */ 967 { DLT_FR, LINKTYPE_FRELAY }, 968 #endif 969 970 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 971 { DLT_RAW, LINKTYPE_RAW }, 972 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 973 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 974 975 /* BSD/OS Cisco HDLC */ 976 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 977 978 /* 979 * These DLT_* codes are not on all platforms, but, so far, 980 * there don't appear to be any platforms that define 981 * other codes with those values; we map them to 982 * different LINKTYPE_* values anyway, just in case. 983 */ 984 985 /* Linux ATM Classical IP */ 986 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 987 988 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 989 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 990 991 /* NetBSD PPP over Ethernet */ 992 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 993 994 /* 995 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN 996 * and LINKTYPE_MATCHING_MAX are mapped to identical 997 * DLT_ values. 998 */ 999 1000 { -1, -1 } 1001 }; 1002 1003 int 1004 dlt_to_linktype(int dlt) 1005 { 1006 int i; 1007 1008 /* 1009 * Map DLT_PFSYNC, whatever it might be, to LINKTYPE_PFSYNC. 1010 */ 1011 if (dlt == DLT_PFSYNC) 1012 return (LINKTYPE_PFSYNC); 1013 1014 /* 1015 * Map the values in the matching range. 1016 */ 1017 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX) 1018 return (dlt); 1019 1020 /* 1021 * Map the values outside that range. 1022 */ 1023 for (i = 0; map[i].dlt != -1; i++) { 1024 if (map[i].dlt == dlt) 1025 return (map[i].linktype); 1026 } 1027 1028 /* 1029 * If we don't have a mapping for this DLT_ code, return an 1030 * error; that means that this is a value with no corresponding 1031 * LINKTYPE_ code, and we need to assign one. 1032 */ 1033 return (-1); 1034 } 1035 1036 int 1037 linktype_to_dlt(int linktype) 1038 { 1039 int i; 1040 1041 /* 1042 * Map LINKTYPE_PFSYNC to DLT_PFSYNC, whatever it might be. 1043 * LINKTYPE_PFSYNC is in the matching range, to make sure 1044 * it's as safe from reuse as we can arrange, so we do 1045 * this test first. 1046 */ 1047 if (linktype == LINKTYPE_PFSYNC) 1048 return (DLT_PFSYNC); 1049 1050 /* 1051 * Map the values in the matching range. 1052 */ 1053 if (linktype >= LINKTYPE_MATCHING_MIN && 1054 linktype <= LINKTYPE_MATCHING_MAX) 1055 return (linktype); 1056 1057 /* 1058 * Map the values outside that range. 1059 */ 1060 for (i = 0; map[i].linktype != -1; i++) { 1061 if (map[i].linktype == linktype) 1062 return (map[i].dlt); 1063 } 1064 1065 /* 1066 * If we don't have an entry for this link type, return 1067 * the link type value; it may be a DLT_ value from an 1068 * older version of libpcap. 1069 */ 1070 return linktype; 1071 } 1072 1073 /* 1074 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1075 * byte order when capturing (it's supplied directly from a 1076 * memory-mapped buffer shared by the kernel). 1077 * 1078 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1079 * we need to convert it from the byte order of the host that wrote 1080 * the file to this host's byte order. 1081 */ 1082 static void 1083 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1084 int header_len_64_bytes) 1085 { 1086 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1087 bpf_u_int32 offset = 0; 1088 usb_isodesc *pisodesc; 1089 int32_t numdesc, i; 1090 1091 /* 1092 * "offset" is the offset *past* the field we're swapping; 1093 * we skip the field *before* checking to make sure 1094 * the captured data length includes the entire field. 1095 */ 1096 1097 /* 1098 * The URB id is a totally opaque value; do we really need to 1099 * convert it to the reading host's byte order??? 1100 */ 1101 offset += 8; /* skip past id */ 1102 if (hdr->caplen < offset) 1103 return; 1104 uhdr->id = SWAPLL(uhdr->id); 1105 1106 offset += 4; /* skip past various 1-byte fields */ 1107 1108 offset += 2; /* skip past bus_id */ 1109 if (hdr->caplen < offset) 1110 return; 1111 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1112 1113 offset += 2; /* skip past various 1-byte fields */ 1114 1115 offset += 8; /* skip past ts_sec */ 1116 if (hdr->caplen < offset) 1117 return; 1118 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1119 1120 offset += 4; /* skip past ts_usec */ 1121 if (hdr->caplen < offset) 1122 return; 1123 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1124 1125 offset += 4; /* skip past status */ 1126 if (hdr->caplen < offset) 1127 return; 1128 uhdr->status = SWAPLONG(uhdr->status); 1129 1130 offset += 4; /* skip past urb_len */ 1131 if (hdr->caplen < offset) 1132 return; 1133 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1134 1135 offset += 4; /* skip past data_len */ 1136 if (hdr->caplen < offset) 1137 return; 1138 uhdr->data_len = SWAPLONG(uhdr->data_len); 1139 1140 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1141 offset += 4; /* skip past s.iso.error_count */ 1142 if (hdr->caplen < offset) 1143 return; 1144 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count); 1145 1146 offset += 4; /* skip past s.iso.numdesc */ 1147 if (hdr->caplen < offset) 1148 return; 1149 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc); 1150 } else 1151 offset += 8; /* skip USB setup header */ 1152 1153 if (header_len_64_bytes) { 1154 /* 1155 * This is either the "version 1" header, with 1156 * 16 bytes of additional fields at the end, or 1157 * a "version 0" header from a memory-mapped 1158 * capture, with 16 bytes of zeroed-out padding 1159 * at the end. Byte swap them as if this were 1160 * a "version 1" header. 1161 */ 1162 offset += 4; /* skip past interval */ 1163 if (hdr->caplen < offset) 1164 return; 1165 uhdr->interval = SWAPLONG(uhdr->interval); 1166 1167 offset += 4; /* skip past start_frame */ 1168 if (hdr->caplen < offset) 1169 return; 1170 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1171 1172 offset += 4; /* skip past xfer_flags */ 1173 if (hdr->caplen < offset) 1174 return; 1175 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1176 1177 offset += 4; /* skip past ndesc */ 1178 if (hdr->caplen < offset) 1179 return; 1180 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1181 } 1182 1183 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1184 /* swap the values in struct linux_usb_isodesc */ 1185 pisodesc = (usb_isodesc *)(void *)(buf+offset); 1186 numdesc = uhdr->s.iso.numdesc; 1187 for (i = 0; i < numdesc; i++) { 1188 offset += 4; /* skip past status */ 1189 if (hdr->caplen < offset) 1190 return; 1191 pisodesc->status = SWAPLONG(pisodesc->status); 1192 1193 offset += 4; /* skip past offset */ 1194 if (hdr->caplen < offset) 1195 return; 1196 pisodesc->offset = SWAPLONG(pisodesc->offset); 1197 1198 offset += 4; /* skip past len */ 1199 if (hdr->caplen < offset) 1200 return; 1201 pisodesc->len = SWAPLONG(pisodesc->len); 1202 1203 offset += 4; /* skip past padding */ 1204 1205 pisodesc++; 1206 } 1207 } 1208 } 1209 1210 /* 1211 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order 1212 * data. They begin with a fixed-length header with big-endian fields, 1213 * followed by a set of TLVs, where the type and length are in host 1214 * byte order but the values are either big-endian or are a raw byte 1215 * sequence that's the same regardless of the host's byte order. 1216 * 1217 * When reading a DLT_NFLOG capture file, we need to convert the type 1218 * and length values from the byte order of the host that wrote the 1219 * file to the byte order of this host. 1220 */ 1221 static void 1222 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf) 1223 { 1224 u_char *p = buf; 1225 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf; 1226 nflog_tlv_t *tlv; 1227 u_int caplen = hdr->caplen; 1228 u_int length = hdr->len; 1229 u_int16_t size; 1230 1231 if (caplen < (int) sizeof(nflog_hdr_t) || length < (int) sizeof(nflog_hdr_t)) { 1232 /* Not enough data to have any TLVs. */ 1233 return; 1234 } 1235 1236 if (!(nfhdr->nflog_version) == 0) { 1237 /* Unknown NFLOG version */ 1238 return; 1239 } 1240 1241 length -= sizeof(nflog_hdr_t); 1242 caplen -= sizeof(nflog_hdr_t); 1243 p += sizeof(nflog_hdr_t); 1244 1245 while (caplen >= sizeof(nflog_tlv_t)) { 1246 tlv = (nflog_tlv_t *) p; 1247 1248 /* Swap the type and length. */ 1249 tlv->tlv_type = SWAPSHORT(tlv->tlv_type); 1250 tlv->tlv_length = SWAPSHORT(tlv->tlv_length); 1251 1252 /* Get the length of the TLV. */ 1253 size = tlv->tlv_length; 1254 if (size % 4 != 0) 1255 size += 4 - size % 4; 1256 1257 /* Is the TLV's length less than the minimum? */ 1258 if (size < sizeof(nflog_tlv_t)) { 1259 /* Yes. Give up now. */ 1260 return; 1261 } 1262 1263 /* Do we have enough data for the full TLV? */ 1264 if (caplen < size || length < size) { 1265 /* No. */ 1266 return; 1267 } 1268 1269 /* Skip over the TLV. */ 1270 length -= size; 1271 caplen -= size; 1272 p += size; 1273 } 1274 } 1275 1276 void 1277 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data) 1278 { 1279 /* 1280 * Convert pseudo-headers from the byte order of 1281 * the host on which the file was saved to our 1282 * byte order, as necessary. 1283 */ 1284 switch (linktype) { 1285 1286 case DLT_USB_LINUX: 1287 swap_linux_usb_header(hdr, data, 0); 1288 break; 1289 1290 case DLT_USB_LINUX_MMAPPED: 1291 swap_linux_usb_header(hdr, data, 1); 1292 break; 1293 1294 case DLT_NFLOG: 1295 swap_nflog_header(hdr, data); 1296 break; 1297 } 1298 } 1299
