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 pcapng files 22 */ 23 24 #ifdef HAVE_CONFIG_H 25 #include <config.h> 26 #endif 27 28 #include <pcap-types.h> 29 30 #include "pcap-int.h" 31 #include "extract.h" 32 #include "pcap/sll.h" 33 #include "pcap/usb.h" 34 #include "pcap/nflog.h" 35 #include "pcap/can_socketcan.h" 36 37 #include "pcap-common.h" 38 39 /* 40 * We don't write DLT_* values to capture files, because they're not the 41 * same on all platforms. 42 * 43 * Unfortunately, the various flavors of BSD have not always used the same 44 * numerical values for the same data types, and various patches to 45 * libpcap for non-BSD OSes have added their own DLT_* codes for link 46 * layer encapsulation types seen on those OSes, and those codes have had, 47 * in some cases, values that were also used, on other platforms, for other 48 * link layer encapsulation types. 49 * 50 * This means that capture files of a type whose numerical DLT_* code 51 * means different things on different BSDs, or with different versions 52 * of libpcap, can't always be read on systems other than those like 53 * the one running on the machine on which the capture was made. 54 * 55 * Instead, we define here a set of LINKTYPE_* codes, and map DLT_* codes 56 * to LINKTYPE_* codes when writing a savefile header, and map LINKTYPE_* 57 * codes to DLT_* codes when reading a savefile header. 58 * 59 * For those DLT_* codes that have, as far as we know, the same values on 60 * all platforms (DLT_NULL through DLT_FDDI), we define LINKTYPE_xxx as 61 * DLT_xxx; that way, captures of those types can still be read by 62 * versions of libpcap that map LINKTYPE_* values to DLT_* values, and 63 * captures of those types written by versions of libpcap that map DLT_ 64 * values to LINKTYPE_ values can still be read by older versions 65 * of libpcap. 66 * 67 * The other LINKTYPE_* codes are given values starting at 100, in the 68 * hopes that no DLT_* code will be given one of those values. 69 * 70 * In order to ensure that a given LINKTYPE_* code's value will refer to 71 * the same encapsulation type on all platforms, you should not allocate 72 * a new LINKTYPE_* value without consulting 73 * "tcpdump-workers@lists.tcpdump.org". The tcpdump developers will 74 * allocate a value for you, and will not subsequently allocate it to 75 * anybody else; that value will be added to the "pcap.h" in the 76 * tcpdump.org Git repository, so that a future libpcap release will 77 * include it. 78 * 79 * You should, if possible, also contribute patches to libpcap and tcpdump 80 * to handle the new encapsulation type, so that they can also be checked 81 * into the tcpdump.org Git repository and so that they will appear in 82 * future libpcap and tcpdump releases. 83 * 84 * Do *NOT* assume that any values after the largest value in this file 85 * are available; you might not have the most up-to-date version of this 86 * file, and new values after that one might have been assigned. Also, 87 * do *NOT* use any values below 100 - those might already have been 88 * taken by one (or more!) organizations. 89 * 90 * Any platform that defines additional DLT_* codes should: 91 * 92 * request a LINKTYPE_* code and value from tcpdump.org, 93 * as per the above; 94 * 95 * add, in their version of libpcap, an entry to map 96 * those DLT_* codes to the corresponding LINKTYPE_* 97 * code; 98 * 99 * redefine, in their "net/bpf.h", any DLT_* values 100 * that collide with the values used by their additional 101 * DLT_* codes, to remove those collisions (but without 102 * making them collide with any of the LINKTYPE_* 103 * values equal to 50 or above; they should also avoid 104 * defining DLT_* values that collide with those 105 * LINKTYPE_* values, either). 106 */ 107 #define LINKTYPE_NULL DLT_NULL 108 #define LINKTYPE_ETHERNET DLT_EN10MB /* also for 100Mb and up */ 109 #define LINKTYPE_EXP_ETHERNET DLT_EN3MB /* 3Mb experimental Ethernet */ 110 #define LINKTYPE_AX25 DLT_AX25 111 #define LINKTYPE_PRONET DLT_PRONET 112 #define LINKTYPE_CHAOS DLT_CHAOS 113 #define LINKTYPE_IEEE802_5 DLT_IEEE802 /* DLT_IEEE802 is used for 802.5 Token Ring */ 114 #define LINKTYPE_ARCNET_BSD DLT_ARCNET /* BSD-style headers */ 115 #define LINKTYPE_SLIP DLT_SLIP 116 #define LINKTYPE_PPP DLT_PPP 117 #define LINKTYPE_FDDI DLT_FDDI 118 119 /* 120 * LINKTYPE_PPP is for use when there might, or might not, be an RFC 1662 121 * PPP in HDLC-like framing header (with 0xff 0x03 before the PPP protocol 122 * field) at the beginning of the packet. 123 * 124 * This is for use when there is always such a header; the address field 125 * might be 0xff, for regular PPP, or it might be an address field for Cisco 126 * point-to-point with HDLC framing as per section 4.3.1 of RFC 1547 ("Cisco 127 * HDLC"). This is, for example, what you get with NetBSD's DLT_PPP_SERIAL. 128 * 129 * We give it the same value as NetBSD's DLT_PPP_SERIAL, in the hopes that 130 * nobody else will choose a DLT_ value of 50, and so that DLT_PPP_SERIAL 131 * captures will be written out with a link type that NetBSD's tcpdump 132 * can read. 133 */ 134 #define LINKTYPE_PPP_HDLC 50 /* PPP in HDLC-like framing */ 135 136 #define LINKTYPE_PPP_ETHER 51 /* NetBSD PPP-over-Ethernet */ 137 138 #define LINKTYPE_SYMANTEC_FIREWALL 99 /* Symantec Enterprise Firewall */ 139 140 /* 141 * These correspond to DLT_s that have different values on different 142 * platforms; we map between these values in capture files and 143 * the DLT_ values as returned by pcap_datalink() and passed to 144 * pcap_open_dead(). 145 */ 146 #define LINKTYPE_ATM_RFC1483 100 /* LLC/SNAP-encapsulated ATM */ 147 #define LINKTYPE_RAW 101 /* raw IP */ 148 #define LINKTYPE_SLIP_BSDOS 102 /* BSD/OS SLIP BPF header */ 149 #define LINKTYPE_PPP_BSDOS 103 /* BSD/OS PPP BPF header */ 150 151 /* 152 * Values starting with 104 are used for newly-assigned link-layer 153 * header type values; for those link-layer header types, the DLT_ 154 * value returned by pcap_datalink() and passed to pcap_open_dead(), 155 * and the LINKTYPE_ value that appears in capture files, are the 156 * same. 157 * 158 * LINKTYPE_MATCHING_MIN is the lowest such value; LINKTYPE_MATCHING_MAX 159 * is the highest such value. 160 */ 161 #define LINKTYPE_MATCHING_MIN 104 /* lowest value in the "matching" range */ 162 163 #define LINKTYPE_C_HDLC 104 /* Cisco HDLC */ 164 #define LINKTYPE_IEEE802_11 105 /* IEEE 802.11 (wireless) */ 165 #define LINKTYPE_ATM_CLIP 106 /* Linux Classical IP over ATM */ 166 #define LINKTYPE_FRELAY 107 /* Frame Relay */ 167 #define LINKTYPE_LOOP 108 /* OpenBSD loopback */ 168 #define LINKTYPE_ENC 109 /* OpenBSD IPSEC enc */ 169 170 /* 171 * These three types are reserved for future use. 172 */ 173 #define LINKTYPE_LANE8023 110 /* ATM LANE + 802.3 */ 174 #define LINKTYPE_HIPPI 111 /* NetBSD HIPPI */ 175 #define LINKTYPE_HDLC 112 /* NetBSD HDLC framing */ 176 177 #define LINKTYPE_LINUX_SLL 113 /* Linux cooked socket capture */ 178 #define LINKTYPE_LTALK 114 /* Apple LocalTalk hardware */ 179 #define LINKTYPE_ECONET 115 /* Acorn Econet */ 180 181 /* 182 * Reserved for use with OpenBSD ipfilter. 183 */ 184 #define LINKTYPE_IPFILTER 116 185 186 #define LINKTYPE_PFLOG 117 /* OpenBSD DLT_PFLOG */ 187 #define LINKTYPE_CISCO_IOS 118 /* For Cisco-internal use */ 188 #define LINKTYPE_IEEE802_11_PRISM 119 /* 802.11 plus Prism II monitor mode radio metadata header */ 189 #define LINKTYPE_IEEE802_11_AIRONET 120 /* 802.11 plus FreeBSD Aironet driver radio metadata header */ 190 191 /* 192 * Reserved for Siemens HiPath HDLC. 193 */ 194 #define LINKTYPE_HHDLC 121 195 196 #define LINKTYPE_IP_OVER_FC 122 /* RFC 2625 IP-over-Fibre Channel */ 197 #define LINKTYPE_SUNATM 123 /* Solaris+SunATM */ 198 199 /* 200 * Reserved as per request from Kent Dahlgren <kent@praesum.com> 201 * for private use. 202 */ 203 #define LINKTYPE_RIO 124 /* RapidIO */ 204 #define LINKTYPE_PCI_EXP 125 /* PCI Express */ 205 #define LINKTYPE_AURORA 126 /* Xilinx Aurora link layer */ 206 207 #define LINKTYPE_IEEE802_11_RADIOTAP 127 /* 802.11 plus radiotap radio metadata header */ 208 209 /* 210 * Reserved for the TZSP encapsulation, as per request from 211 * Chris Waters <chris.waters@networkchemistry.com> 212 * TZSP is a generic encapsulation for any other link type, 213 * which includes a means to include meta-information 214 * with the packet, e.g. signal strength and channel 215 * for 802.11 packets. 216 */ 217 #define LINKTYPE_TZSP 128 /* Tazmen Sniffer Protocol */ 218 219 #define LINKTYPE_ARCNET_LINUX 129 /* Linux-style headers */ 220 221 /* 222 * Juniper-private data link types, as per request from 223 * Hannes Gredler <hannes@juniper.net>. The corresponding 224 * DLT_s are used for passing on chassis-internal 225 * metainformation such as QOS profiles, etc.. 226 */ 227 #define LINKTYPE_JUNIPER_MLPPP 130 228 #define LINKTYPE_JUNIPER_MLFR 131 229 #define LINKTYPE_JUNIPER_ES 132 230 #define LINKTYPE_JUNIPER_GGSN 133 231 #define LINKTYPE_JUNIPER_MFR 134 232 #define LINKTYPE_JUNIPER_ATM2 135 233 #define LINKTYPE_JUNIPER_SERVICES 136 234 #define LINKTYPE_JUNIPER_ATM1 137 235 236 #define LINKTYPE_APPLE_IP_OVER_IEEE1394 138 /* Apple IP-over-IEEE 1394 cooked header */ 237 238 #define LINKTYPE_MTP2_WITH_PHDR 139 239 #define LINKTYPE_MTP2 140 240 #define LINKTYPE_MTP3 141 241 #define LINKTYPE_SCCP 142 242 243 #define LINKTYPE_DOCSIS 143 /* DOCSIS MAC frames */ 244 245 #define LINKTYPE_LINUX_IRDA 144 /* Linux-IrDA */ 246 247 /* 248 * Reserved for IBM SP switch and IBM Next Federation switch. 249 */ 250 #define LINKTYPE_IBM_SP 145 251 #define LINKTYPE_IBM_SN 146 252 253 /* 254 * Reserved for private use. If you have some link-layer header type 255 * that you want to use within your organization, with the capture files 256 * using that link-layer header type not ever be sent outside your 257 * organization, you can use these values. 258 * 259 * No libpcap release will use these for any purpose, nor will any 260 * tcpdump release use them, either. 261 * 262 * Do *NOT* use these in capture files that you expect anybody not using 263 * your private versions of capture-file-reading tools to read; in 264 * particular, do *NOT* use them in products, otherwise you may find that 265 * people won't be able to use tcpdump, or snort, or Ethereal, or... to 266 * read capture files from your firewall/intrusion detection/traffic 267 * monitoring/etc. appliance, or whatever product uses that LINKTYPE_ value, 268 * and you may also find that the developers of those applications will 269 * not accept patches to let them read those files. 270 * 271 * Also, do not use them if somebody might send you a capture using them 272 * for *their* private type and tools using them for *your* private type 273 * would have to read them. 274 * 275 * Instead, in those cases, ask "tcpdump-workers@lists.tcpdump.org" for a 276 * new DLT_ and LINKTYPE_ value, as per the comment in pcap/bpf.h, and use 277 * the type you're given. 278 */ 279 #define LINKTYPE_USER0 147 280 #define LINKTYPE_USER1 148 281 #define LINKTYPE_USER2 149 282 #define LINKTYPE_USER3 150 283 #define LINKTYPE_USER4 151 284 #define LINKTYPE_USER5 152 285 #define LINKTYPE_USER6 153 286 #define LINKTYPE_USER7 154 287 #define LINKTYPE_USER8 155 288 #define LINKTYPE_USER9 156 289 #define LINKTYPE_USER10 157 290 #define LINKTYPE_USER11 158 291 #define LINKTYPE_USER12 159 292 #define LINKTYPE_USER13 160 293 #define LINKTYPE_USER14 161 294 #define LINKTYPE_USER15 162 295 296 /* 297 * For future use with 802.11 captures - defined by AbsoluteValue 298 * Systems to store a number of bits of link-layer information 299 * including radio information: 300 * 301 * http://www.shaftnet.org/~pizza/software/capturefrm.txt 302 */ 303 #define LINKTYPE_IEEE802_11_AVS 163 /* 802.11 plus AVS radio metadata header */ 304 305 /* 306 * Juniper-private data link type, as per request from 307 * Hannes Gredler <hannes@juniper.net>. The corresponding 308 * DLT_s are used for passing on chassis-internal 309 * metainformation such as QOS profiles, etc.. 310 */ 311 #define LINKTYPE_JUNIPER_MONITOR 164 312 313 /* 314 * BACnet MS/TP frames. 315 */ 316 #define LINKTYPE_BACNET_MS_TP 165 317 318 /* 319 * Another PPP variant as per request from Karsten Keil <kkeil@suse.de>. 320 * 321 * This is used in some OSes to allow a kernel socket filter to distinguish 322 * between incoming and outgoing packets, on a socket intended to 323 * supply pppd with outgoing packets so it can do dial-on-demand and 324 * hangup-on-lack-of-demand; incoming packets are filtered out so they 325 * don't cause pppd to hold the connection up (you don't want random 326 * input packets such as port scans, packets from old lost connections, 327 * etc. to force the connection to stay up). 328 * 329 * The first byte of the PPP header (0xff03) is modified to accomodate 330 * the direction - 0x00 = IN, 0x01 = OUT. 331 */ 332 #define LINKTYPE_PPP_PPPD 166 333 334 /* 335 * Juniper-private data link type, as per request from 336 * Hannes Gredler <hannes@juniper.net>. The DLT_s are used 337 * for passing on chassis-internal metainformation such as 338 * QOS profiles, cookies, etc.. 339 */ 340 #define LINKTYPE_JUNIPER_PPPOE 167 341 #define LINKTYPE_JUNIPER_PPPOE_ATM 168 342 343 #define LINKTYPE_GPRS_LLC 169 /* GPRS LLC */ 344 #define LINKTYPE_GPF_T 170 /* GPF-T (ITU-T G.7041/Y.1303) */ 345 #define LINKTYPE_GPF_F 171 /* GPF-F (ITU-T G.7041/Y.1303) */ 346 347 /* 348 * Requested by Oolan Zimmer <oz@gcom.com> for use in Gcom's T1/E1 line 349 * monitoring equipment. 350 */ 351 #define LINKTYPE_GCOM_T1E1 172 352 #define LINKTYPE_GCOM_SERIAL 173 353 354 /* 355 * Juniper-private data link type, as per request from 356 * Hannes Gredler <hannes@juniper.net>. The DLT_ is used 357 * for internal communication to Physical Interface Cards (PIC) 358 */ 359 #define LINKTYPE_JUNIPER_PIC_PEER 174 360 361 /* 362 * Link types requested by Gregor Maier <gregor@endace.com> of Endace 363 * Measurement Systems. They add an ERF header (see 364 * http://www.endace.com/support/EndaceRecordFormat.pdf) in front of 365 * the link-layer header. 366 */ 367 #define LINKTYPE_ERF_ETH 175 /* Ethernet */ 368 #define LINKTYPE_ERF_POS 176 /* Packet-over-SONET */ 369 370 /* 371 * Requested by Daniele Orlandi <daniele@orlandi.com> for raw LAPD 372 * for vISDN (http://www.orlandi.com/visdn/). Its link-layer header 373 * includes additional information before the LAPD header, so it's 374 * not necessarily a generic LAPD header. 375 */ 376 #define LINKTYPE_LINUX_LAPD 177 377 378 /* 379 * Juniper-private data link type, as per request from 380 * Hannes Gredler <hannes@juniper.net>. 381 * The Link Types are used for prepending meta-information 382 * like interface index, interface name 383 * before standard Ethernet, PPP, Frelay & C-HDLC Frames 384 */ 385 #define LINKTYPE_JUNIPER_ETHER 178 386 #define LINKTYPE_JUNIPER_PPP 179 387 #define LINKTYPE_JUNIPER_FRELAY 180 388 #define LINKTYPE_JUNIPER_CHDLC 181 389 390 /* 391 * Multi Link Frame Relay (FRF.16) 392 */ 393 #define LINKTYPE_MFR 182 394 395 /* 396 * Juniper-private data link type, as per request from 397 * Hannes Gredler <hannes@juniper.net>. 398 * The DLT_ is used for internal communication with a 399 * voice Adapter Card (PIC) 400 */ 401 #define LINKTYPE_JUNIPER_VP 183 402 403 /* 404 * Arinc 429 frames. 405 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 406 * Every frame contains a 32bit A429 label. 407 * More documentation on Arinc 429 can be found at 408 * http://www.condoreng.com/support/downloads/tutorials/ARINCTutorial.pdf 409 */ 410 #define LINKTYPE_A429 184 411 412 /* 413 * Arinc 653 Interpartition Communication messages. 414 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 415 * Please refer to the A653-1 standard for more information. 416 */ 417 #define LINKTYPE_A653_ICM 185 418 419 /* 420 * This used to be "USB packets, beginning with a USB setup header; 421 * requested by Paolo Abeni <paolo.abeni@email.it>." 422 * 423 * However, that header didn't work all that well - it left out some 424 * useful information - and was abandoned in favor of the DLT_USB_LINUX 425 * header. 426 * 427 * This is now used by FreeBSD for its BPF taps for USB; that has its 428 * own headers. So it is written, so it is done. 429 */ 430 #define LINKTYPE_USB_FREEBSD 186 431 432 /* 433 * Bluetooth HCI UART transport layer (part H:4); requested by 434 * Paolo Abeni. 435 */ 436 #define LINKTYPE_BLUETOOTH_HCI_H4 187 437 438 /* 439 * IEEE 802.16 MAC Common Part Sublayer; requested by Maria Cruz 440 * <cruz_petagay@bah.com>. 441 */ 442 #define LINKTYPE_IEEE802_16_MAC_CPS 188 443 444 /* 445 * USB packets, beginning with a Linux USB header; requested by 446 * Paolo Abeni <paolo.abeni@email.it>. 447 */ 448 #define LINKTYPE_USB_LINUX 189 449 450 /* 451 * Controller Area Network (CAN) v. 2.0B packets. 452 * DLT_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 453 * Used to dump CAN packets coming from a CAN Vector board. 454 * More documentation on the CAN v2.0B frames can be found at 455 * http://www.can-cia.org/downloads/?269 456 */ 457 #define LINKTYPE_CAN20B 190 458 459 /* 460 * IEEE 802.15.4, with address fields padded, as is done by Linux 461 * drivers; requested by Juergen Schimmer. 462 */ 463 #define LINKTYPE_IEEE802_15_4_LINUX 191 464 465 /* 466 * Per Packet Information encapsulated packets. 467 * LINKTYPE_ requested by Gianluca Varenni <gianluca.varenni@cacetech.com>. 468 */ 469 #define LINKTYPE_PPI 192 470 471 /* 472 * Header for 802.16 MAC Common Part Sublayer plus a radiotap radio header; 473 * requested by Charles Clancy. 474 */ 475 #define LINKTYPE_IEEE802_16_MAC_CPS_RADIO 193 476 477 /* 478 * Juniper-private data link type, as per request from 479 * Hannes Gredler <hannes@juniper.net>. 480 * The DLT_ is used for internal communication with a 481 * integrated service module (ISM). 482 */ 483 #define LINKTYPE_JUNIPER_ISM 194 484 485 /* 486 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 487 * nothing), and with the FCS at the end of the frame; requested by 488 * Mikko Saarnivala <mikko.saarnivala@sensinode.com>. 489 * 490 * This should only be used if the FCS is present at the end of the 491 * frame; if the frame has no FCS, DLT_IEEE802_15_4_NOFCS should be 492 * used. 493 */ 494 #define LINKTYPE_IEEE802_15_4_WITHFCS 195 495 496 /* 497 * Various link-layer types, with a pseudo-header, for SITA 498 * (http://www.sita.aero/); requested by Fulko Hew (fulko.hew@gmail.com). 499 */ 500 #define LINKTYPE_SITA 196 501 502 /* 503 * Various link-layer types, with a pseudo-header, for Endace DAG cards; 504 * encapsulates Endace ERF records. Requested by Stephen Donnelly 505 * <stephen@endace.com>. 506 */ 507 #define LINKTYPE_ERF 197 508 509 /* 510 * Special header prepended to Ethernet packets when capturing from a 511 * u10 Networks board. Requested by Phil Mulholland 512 * <phil@u10networks.com>. 513 */ 514 #define LINKTYPE_RAIF1 198 515 516 /* 517 * IPMB packet for IPMI, beginning with the I2C slave address, followed 518 * by the netFn and LUN, etc.. Requested by Chanthy Toeung 519 * <chanthy.toeung@ca.kontron.com>. 520 */ 521 #define LINKTYPE_IPMB 199 522 523 /* 524 * Juniper-private data link type, as per request from 525 * Hannes Gredler <hannes@juniper.net>. 526 * The DLT_ is used for capturing data on a secure tunnel interface. 527 */ 528 #define LINKTYPE_JUNIPER_ST 200 529 530 /* 531 * Bluetooth HCI UART transport layer (part H:4), with pseudo-header 532 * that includes direction information; requested by Paolo Abeni. 533 */ 534 #define LINKTYPE_BLUETOOTH_HCI_H4_WITH_PHDR 201 535 536 /* 537 * AX.25 packet with a 1-byte KISS header; see 538 * 539 * http://www.ax25.net/kiss.htm 540 * 541 * as per Richard Stearn <richard@rns-stearn.demon.co.uk>. 542 */ 543 #define LINKTYPE_AX25_KISS 202 544 545 /* 546 * LAPD packets from an ISDN channel, starting with the address field, 547 * with no pseudo-header. 548 * Requested by Varuna De Silva <varunax@gmail.com>. 549 */ 550 #define LINKTYPE_LAPD 203 551 552 /* 553 * Variants of various link-layer headers, with a one-byte direction 554 * pseudo-header prepended - zero means "received by this host", 555 * non-zero (any non-zero value) means "sent by this host" - as per 556 * Will Barker <w.barker@zen.co.uk>. 557 */ 558 #define LINKTYPE_PPP_WITH_DIR 204 /* PPP */ 559 #define LINKTYPE_C_HDLC_WITH_DIR 205 /* Cisco HDLC */ 560 #define LINKTYPE_FRELAY_WITH_DIR 206 /* Frame Relay */ 561 #define LINKTYPE_LAPB_WITH_DIR 207 /* LAPB */ 562 563 /* 564 * 208 is reserved for an as-yet-unspecified proprietary link-layer 565 * type, as requested by Will Barker. 566 */ 567 568 /* 569 * IPMB with a Linux-specific pseudo-header; as requested by Alexey Neyman 570 * <avn@pigeonpoint.com>. 571 */ 572 #define LINKTYPE_IPMB_LINUX 209 573 574 /* 575 * FlexRay automotive bus - http://www.flexray.com/ - as requested 576 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 577 */ 578 #define LINKTYPE_FLEXRAY 210 579 580 /* 581 * Media Oriented Systems Transport (MOST) bus for multimedia 582 * transport - http://www.mostcooperation.com/ - as requested 583 * by Hannes Kaelber <hannes.kaelber@x2e.de>. 584 */ 585 #define LINKTYPE_MOST 211 586 587 /* 588 * Local Interconnect Network (LIN) bus for vehicle networks - 589 * http://www.lin-subbus.org/ - as requested by Hannes Kaelber 590 * <hannes.kaelber@x2e.de>. 591 */ 592 #define LINKTYPE_LIN 212 593 594 /* 595 * X2E-private data link type used for serial line capture, 596 * as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 597 */ 598 #define LINKTYPE_X2E_SERIAL 213 599 600 /* 601 * X2E-private data link type used for the Xoraya data logger 602 * family, as requested by Hannes Kaelber <hannes.kaelber@x2e.de>. 603 */ 604 #define LINKTYPE_X2E_XORAYA 214 605 606 /* 607 * IEEE 802.15.4, exactly as it appears in the spec (no padding, no 608 * nothing), but with the PHY-level data for non-ASK PHYs (4 octets 609 * of 0 as preamble, one octet of SFD, one octet of frame length+ 610 * reserved bit, and then the MAC-layer data, starting with the 611 * frame control field). 612 * 613 * Requested by Max Filippov <jcmvbkbc@gmail.com>. 614 */ 615 #define LINKTYPE_IEEE802_15_4_NONASK_PHY 215 616 617 /* 618 * David Gibson <david@gibson.dropbear.id.au> requested this for 619 * captures from the Linux kernel /dev/input/eventN devices. This 620 * is used to communicate keystrokes and mouse movements from the 621 * Linux kernel to display systems, such as Xorg. 622 */ 623 #define LINKTYPE_LINUX_EVDEV 216 624 625 /* 626 * GSM Um and Abis interfaces, preceded by a "gsmtap" header. 627 * 628 * Requested by Harald Welte <laforge@gnumonks.org>. 629 */ 630 #define LINKTYPE_GSMTAP_UM 217 631 #define LINKTYPE_GSMTAP_ABIS 218 632 633 /* 634 * MPLS, with an MPLS label as the link-layer header. 635 * Requested by Michele Marchetto <michele@openbsd.org> on behalf 636 * of OpenBSD. 637 */ 638 #define LINKTYPE_MPLS 219 639 640 /* 641 * USB packets, beginning with a Linux USB header, with the USB header 642 * padded to 64 bytes; required for memory-mapped access. 643 */ 644 #define LINKTYPE_USB_LINUX_MMAPPED 220 645 646 /* 647 * DECT packets, with a pseudo-header; requested by 648 * Matthias Wenzel <tcpdump@mazzoo.de>. 649 */ 650 #define LINKTYPE_DECT 221 651 652 /* 653 * From: "Lidwa, Eric (GSFC-582.0)[SGT INC]" <eric.lidwa-1@nasa.gov> 654 * Date: Mon, 11 May 2009 11:18:30 -0500 655 * 656 * DLT_AOS. We need it for AOS Space Data Link Protocol. 657 * I have already written dissectors for but need an OK from 658 * legal before I can submit a patch. 659 * 660 */ 661 #define LINKTYPE_AOS 222 662 663 /* 664 * Wireless HART (Highway Addressable Remote Transducer) 665 * From the HART Communication Foundation 666 * IES/PAS 62591 667 * 668 * Requested by Sam Roberts <vieuxtech@gmail.com>. 669 */ 670 #define LINKTYPE_WIHART 223 671 672 /* 673 * Fibre Channel FC-2 frames, beginning with a Frame_Header. 674 * Requested by Kahou Lei <kahou82@gmail.com>. 675 */ 676 #define LINKTYPE_FC_2 224 677 678 /* 679 * Fibre Channel FC-2 frames, beginning with an encoding of the 680 * SOF, and ending with an encoding of the EOF. 681 * 682 * The encodings represent the frame delimiters as 4-byte sequences 683 * representing the corresponding ordered sets, with K28.5 684 * represented as 0xBC, and the D symbols as the corresponding 685 * byte values; for example, SOFi2, which is K28.5 - D21.5 - D1.2 - D21.2, 686 * is represented as 0xBC 0xB5 0x55 0x55. 687 * 688 * Requested by Kahou Lei <kahou82@gmail.com>. 689 */ 690 #define LINKTYPE_FC_2_WITH_FRAME_DELIMS 225 691 692 /* 693 * Solaris ipnet pseudo-header; requested by Darren Reed <Darren.Reed@Sun.COM>. 694 * 695 * The pseudo-header starts with a one-byte version number; for version 2, 696 * the pseudo-header is: 697 * 698 * struct dl_ipnetinfo { 699 * uint8_t dli_version; 700 * uint8_t dli_family; 701 * uint16_t dli_htype; 702 * uint32_t dli_pktlen; 703 * uint32_t dli_ifindex; 704 * uint32_t dli_grifindex; 705 * uint32_t dli_zsrc; 706 * uint32_t dli_zdst; 707 * }; 708 * 709 * dli_version is 2 for the current version of the pseudo-header. 710 * 711 * dli_family is a Solaris address family value, so it's 2 for IPv4 712 * and 26 for IPv6. 713 * 714 * dli_htype is a "hook type" - 0 for incoming packets, 1 for outgoing 715 * packets, and 2 for packets arriving from another zone on the same 716 * machine. 717 * 718 * dli_pktlen is the length of the packet data following the pseudo-header 719 * (so the captured length minus dli_pktlen is the length of the 720 * pseudo-header, assuming the entire pseudo-header was captured). 721 * 722 * dli_ifindex is the interface index of the interface on which the 723 * packet arrived. 724 * 725 * dli_grifindex is the group interface index number (for IPMP interfaces). 726 * 727 * dli_zsrc is the zone identifier for the source of the packet. 728 * 729 * dli_zdst is the zone identifier for the destination of the packet. 730 * 731 * A zone number of 0 is the global zone; a zone number of 0xffffffff 732 * means that the packet arrived from another host on the network, not 733 * from another zone on the same machine. 734 * 735 * An IPv4 or IPv6 datagram follows the pseudo-header; dli_family indicates 736 * which of those it is. 737 */ 738 #define LINKTYPE_IPNET 226 739 740 /* 741 * CAN (Controller Area Network) frames, with a pseudo-header as supplied 742 * by Linux SocketCAN, and with multi-byte numerical fields in that header 743 * in big-endian byte order. 744 * 745 * See Documentation/networking/can.txt in the Linux 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 macOS, 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 * Apple's DLT_PKTAP headers. 969 * 970 * Sadly, the folks at Apple either had no clue that the DLT_USERn values 971 * are for internal use within an organization and partners only, and 972 * didn't know that the right way to get a link-layer header type is to 973 * ask tcpdump.org for one, or knew and didn't care, so they just 974 * used DLT_USER2, which causes problems for everything except for 975 * their version of tcpdump. 976 * 977 * So I'll just give them one; hopefully this will show up in a 978 * libpcap release in time for them to get this into 10.10 Big Sur 979 * or whatever Mavericks' successor is called. LINKTYPE_PKTAP 980 * will be 258 *even on macOS*; that is *intentional*, so that 981 * PKTAP files look the same on *all* OSes (different OSes can have 982 * different numerical values for a given DLT_, but *MUST NOT* have 983 * different values for what goes in a file, as files can be moved 984 * between OSes!). 985 */ 986 #define LINKTYPE_PKTAP 258 987 988 /* 989 * Ethernet packets preceded by a header giving the last 6 octets 990 * of the preamble specified by 802.3-2012 Clause 65, section 991 * 65.1.3.2 "Transmit". 992 */ 993 #define LINKTYPE_EPON 259 994 995 /* 996 * IPMI trace packets, as specified by Table 3-20 "Trace Data Block Format" 997 * in the PICMG HPM.2 specification. 998 */ 999 #define LINKTYPE_IPMI_HPM_2 260 1000 1001 /* 1002 * per Joshua Wright <jwright@hasborg.com>, formats for Zwave captures. 1003 */ 1004 #define LINKTYPE_ZWAVE_R1_R2 261 1005 #define LINKTYPE_ZWAVE_R3 262 1006 1007 /* 1008 * per Steve Karg <skarg@users.sourceforge.net>, formats for Wattstopper 1009 * Digital Lighting Management room bus serial protocol captures. 1010 */ 1011 #define LINKTYPE_WATTSTOPPER_DLM 263 1012 1013 /* 1014 * ISO 14443 contactless smart card messages. 1015 */ 1016 #define LINKTYPE_ISO_14443 264 1017 1018 /* 1019 * Radio data system (RDS) groups. IEC 62106. 1020 * Per Jonathan Brucker <jonathan.brucke@gmail.com>. 1021 */ 1022 #define LINKTYPE_RDS 265 1023 1024 /* 1025 * USB packets, beginning with a Darwin (macOS, etc.) header. 1026 */ 1027 #define LINKTYPE_USB_DARWIN 266 1028 1029 /* 1030 * OpenBSD DLT_OPENFLOW. 1031 */ 1032 #define LINKTYPE_OPENFLOW 267 1033 1034 /* 1035 * SDLC frames containing SNA PDUs. 1036 */ 1037 #define LINKTYPE_SDLC 268 1038 1039 /* 1040 * per "Selvig, Bjorn" <b.selvig@ti.com> used for 1041 * TI protocol sniffer. 1042 */ 1043 #define LINKTYPE_TI_LLN_SNIFFER 269 1044 1045 /* 1046 * per: Erik de Jong <erikdejong at gmail.com> for 1047 * https://github.com/eriknl/LoRaTap/releases/tag/v0.1 1048 */ 1049 #define LINKTYPE_LORATAP 270 1050 1051 /* 1052 * per: Stefanha at gmail.com for 1053 * http://lists.sandelman.ca/pipermail/tcpdump-workers/2017-May/000772.html 1054 * and: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/vsockmon.h 1055 * for: http://qemu-project.org/Features/VirtioVsock 1056 */ 1057 #define LINKTYPE_VSOCK 271 1058 1059 /* 1060 * Nordic Semiconductor Bluetooth LE sniffer. 1061 */ 1062 #define LINKTYPE_NORDIC_BLE 272 1063 1064 /* 1065 * Excentis DOCSIS 3.1 RF sniffer (XRA-31) 1066 * per: bruno.verstuyft at excentis.com 1067 * http://www.xra31.com/xra-header 1068 */ 1069 #define LINKTYPE_DOCSIS31_XRA31 273 1070 1071 /* 1072 * mPackets, as specified by IEEE 802.3br Figure 99-4, starting 1073 * with the preamble and always ending with a CRC field. 1074 */ 1075 #define LINKTYPE_ETHERNET_MPACKET 274 1076 1077 /* 1078 * DisplayPort AUX channel monitoring data as specified by VESA 1079 * DisplayPort(DP) Standard preceeded by a pseudo-header. 1080 * per dirk.eibach at gdsys.cc 1081 */ 1082 #define LINKTYPE_DISPLAYPORT_AUX 275 1083 1084 #define LINKTYPE_MATCHING_MAX 275 /* highest value in the "matching" range */ 1085 1086 static struct linktype_map { 1087 int dlt; 1088 int linktype; 1089 } map[] = { 1090 /* 1091 * These DLT_* codes have LINKTYPE_* codes with values identical 1092 * to the values of the corresponding DLT_* code. 1093 */ 1094 { DLT_NULL, LINKTYPE_NULL }, 1095 { DLT_EN10MB, LINKTYPE_ETHERNET }, 1096 { DLT_EN3MB, LINKTYPE_EXP_ETHERNET }, 1097 { DLT_AX25, LINKTYPE_AX25 }, 1098 { DLT_PRONET, LINKTYPE_PRONET }, 1099 { DLT_CHAOS, LINKTYPE_CHAOS }, 1100 { DLT_IEEE802, LINKTYPE_IEEE802_5 }, 1101 { DLT_ARCNET, LINKTYPE_ARCNET_BSD }, 1102 { DLT_SLIP, LINKTYPE_SLIP }, 1103 { DLT_PPP, LINKTYPE_PPP }, 1104 { DLT_FDDI, LINKTYPE_FDDI }, 1105 { DLT_SYMANTEC_FIREWALL, LINKTYPE_SYMANTEC_FIREWALL }, 1106 1107 /* 1108 * These DLT_* codes have different values on different 1109 * platforms; we map them to LINKTYPE_* codes that 1110 * have values that should never be equal to any DLT_* 1111 * code. 1112 */ 1113 #ifdef DLT_FR 1114 /* BSD/OS Frame Relay */ 1115 { DLT_FR, LINKTYPE_FRELAY }, 1116 #endif 1117 1118 { DLT_ATM_RFC1483, LINKTYPE_ATM_RFC1483 }, 1119 { DLT_RAW, LINKTYPE_RAW }, 1120 { DLT_SLIP_BSDOS, LINKTYPE_SLIP_BSDOS }, 1121 { DLT_PPP_BSDOS, LINKTYPE_PPP_BSDOS }, 1122 1123 /* BSD/OS Cisco HDLC */ 1124 { DLT_C_HDLC, LINKTYPE_C_HDLC }, 1125 1126 /* 1127 * These DLT_* codes are not on all platforms, but, so far, 1128 * there don't appear to be any platforms that define 1129 * other codes with those values; we map them to 1130 * different LINKTYPE_* values anyway, just in case. 1131 */ 1132 1133 /* Linux ATM Classical IP */ 1134 { DLT_ATM_CLIP, LINKTYPE_ATM_CLIP }, 1135 1136 /* NetBSD sync/async serial PPP (or Cisco HDLC) */ 1137 { DLT_PPP_SERIAL, LINKTYPE_PPP_HDLC }, 1138 1139 /* NetBSD PPP over Ethernet */ 1140 { DLT_PPP_ETHER, LINKTYPE_PPP_ETHER }, 1141 1142 /* 1143 * All LINKTYPE_ values between LINKTYPE_MATCHING_MIN 1144 * and LINKTYPE_MATCHING_MAX are mapped to identical 1145 * DLT_ values. 1146 */ 1147 1148 { -1, -1 } 1149 }; 1150 1151 int 1152 dlt_to_linktype(int dlt) 1153 { 1154 int i; 1155 1156 /* 1157 * DLTs that, on some platforms, have values in the matching range 1158 * but that *don't* have the same value as the corresponding 1159 * LINKTYPE because, for some reason, not all OSes have the 1160 * same value for that DLT (note that the DLT's value might be 1161 * outside the matching range on some of those OSes). 1162 */ 1163 if (dlt == DLT_PFSYNC) 1164 return (LINKTYPE_PFSYNC); 1165 if (dlt == DLT_PKTAP) 1166 return (LINKTYPE_PKTAP); 1167 1168 /* 1169 * For all other values in the matching range, the DLT 1170 * value is the same as the LINKTYPE value. 1171 */ 1172 if (dlt >= DLT_MATCHING_MIN && dlt <= DLT_MATCHING_MAX) 1173 return (dlt); 1174 1175 /* 1176 * Map the values outside that range. 1177 */ 1178 for (i = 0; map[i].dlt != -1; i++) { 1179 if (map[i].dlt == dlt) 1180 return (map[i].linktype); 1181 } 1182 1183 /* 1184 * If we don't have a mapping for this DLT, return an 1185 * error; that means that this is a value with no corresponding 1186 * LINKTYPE, and we need to assign one. 1187 */ 1188 return (-1); 1189 } 1190 1191 int 1192 linktype_to_dlt(int linktype) 1193 { 1194 int i; 1195 1196 /* 1197 * LINKTYPEs in the matching range that *don't* 1198 * have the same value as the corresponding DLTs 1199 * because, for some reason, not all OSes have the 1200 * same value for that DLT. 1201 */ 1202 if (linktype == LINKTYPE_PFSYNC) 1203 return (DLT_PFSYNC); 1204 if (linktype == LINKTYPE_PKTAP) 1205 return (DLT_PKTAP); 1206 1207 /* 1208 * For all other values in the matching range, the LINKTYPE 1209 * value is the same as the DLT value. 1210 */ 1211 if (linktype >= LINKTYPE_MATCHING_MIN && 1212 linktype <= LINKTYPE_MATCHING_MAX) 1213 return (linktype); 1214 1215 /* 1216 * Map the values outside that range. 1217 */ 1218 for (i = 0; map[i].linktype != -1; i++) { 1219 if (map[i].linktype == linktype) 1220 return (map[i].dlt); 1221 } 1222 1223 /* 1224 * If we don't have an entry for this LINKTYPE, return 1225 * the link type value; it may be a DLT from an older 1226 * version of libpcap. 1227 */ 1228 return linktype; 1229 } 1230 1231 /* 1232 * Return the maximum snapshot length for a given DLT_ value. 1233 * 1234 * For most link-layer types, we use MAXIMUM_SNAPLEN, but for DLT_DBUS, 1235 * the maximum is 134217728, as per 1236 * 1237 * https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-messages 1238 */ 1239 u_int 1240 max_snaplen_for_dlt(int dlt) 1241 { 1242 if (dlt == DLT_DBUS) 1243 return 134217728; 1244 else 1245 return MAXIMUM_SNAPLEN; 1246 } 1247 1248 /* 1249 * DLT_LINUX_SLL packets with a protocol type of LINUX_SLL_P_CAN or 1250 * LINUX_SLL_P_CANFD have SocketCAN headers in front of the payload, 1251 * with the CAN ID being in host byte order. 1252 * 1253 * When reading a DLT_LINUX_SLL capture file, we need to check for those 1254 * packets and convert the CAN ID from the byte order of the host that 1255 * wrote the file to this host's byte order. 1256 */ 1257 static void 1258 swap_linux_sll_header(const struct pcap_pkthdr *hdr, u_char *buf) 1259 { 1260 u_int caplen = hdr->caplen; 1261 u_int length = hdr->len; 1262 struct sll_header *shdr = (struct sll_header *)buf; 1263 uint16_t protocol; 1264 pcap_can_socketcan_hdr *chdr; 1265 1266 if (caplen < (u_int) sizeof(struct sll_header) || 1267 length < (u_int) sizeof(struct sll_header)) { 1268 /* Not enough data to have the protocol field */ 1269 return; 1270 } 1271 1272 protocol = EXTRACT_16BITS(&shdr->sll_protocol); 1273 if (protocol != LINUX_SLL_P_CAN && protocol != LINUX_SLL_P_CANFD) 1274 return; 1275 1276 /* 1277 * SocketCAN packet; fix up the packet's header. 1278 */ 1279 chdr = (pcap_can_socketcan_hdr *)(buf + sizeof(struct sll_header)); 1280 if (caplen < (u_int) sizeof(struct sll_header) + sizeof(chdr->can_id) || 1281 length < (u_int) sizeof(struct sll_header) + sizeof(chdr->can_id)) { 1282 /* Not enough data to have the CAN ID */ 1283 return; 1284 } 1285 chdr->can_id = SWAPLONG(chdr->can_id); 1286 } 1287 1288 /* 1289 * The DLT_USB_LINUX and DLT_USB_LINUX_MMAPPED headers are in host 1290 * byte order when capturing (it's supplied directly from a 1291 * memory-mapped buffer shared by the kernel). 1292 * 1293 * When reading a DLT_USB_LINUX or DLT_USB_LINUX_MMAPPED capture file, 1294 * we need to convert it from the byte order of the host that wrote 1295 * the file to this host's byte order. 1296 */ 1297 static void 1298 swap_linux_usb_header(const struct pcap_pkthdr *hdr, u_char *buf, 1299 int header_len_64_bytes) 1300 { 1301 pcap_usb_header_mmapped *uhdr = (pcap_usb_header_mmapped *)buf; 1302 bpf_u_int32 offset = 0; 1303 1304 /* 1305 * "offset" is the offset *past* the field we're swapping; 1306 * we skip the field *before* checking to make sure 1307 * the captured data length includes the entire field. 1308 */ 1309 1310 /* 1311 * The URB id is a totally opaque value; do we really need to 1312 * convert it to the reading host's byte order??? 1313 */ 1314 offset += 8; /* skip past id */ 1315 if (hdr->caplen < offset) 1316 return; 1317 uhdr->id = SWAPLL(uhdr->id); 1318 1319 offset += 4; /* skip past various 1-byte fields */ 1320 1321 offset += 2; /* skip past bus_id */ 1322 if (hdr->caplen < offset) 1323 return; 1324 uhdr->bus_id = SWAPSHORT(uhdr->bus_id); 1325 1326 offset += 2; /* skip past various 1-byte fields */ 1327 1328 offset += 8; /* skip past ts_sec */ 1329 if (hdr->caplen < offset) 1330 return; 1331 uhdr->ts_sec = SWAPLL(uhdr->ts_sec); 1332 1333 offset += 4; /* skip past ts_usec */ 1334 if (hdr->caplen < offset) 1335 return; 1336 uhdr->ts_usec = SWAPLONG(uhdr->ts_usec); 1337 1338 offset += 4; /* skip past status */ 1339 if (hdr->caplen < offset) 1340 return; 1341 uhdr->status = SWAPLONG(uhdr->status); 1342 1343 offset += 4; /* skip past urb_len */ 1344 if (hdr->caplen < offset) 1345 return; 1346 uhdr->urb_len = SWAPLONG(uhdr->urb_len); 1347 1348 offset += 4; /* skip past data_len */ 1349 if (hdr->caplen < offset) 1350 return; 1351 uhdr->data_len = SWAPLONG(uhdr->data_len); 1352 1353 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1354 offset += 4; /* skip past s.iso.error_count */ 1355 if (hdr->caplen < offset) 1356 return; 1357 uhdr->s.iso.error_count = SWAPLONG(uhdr->s.iso.error_count); 1358 1359 offset += 4; /* skip past s.iso.numdesc */ 1360 if (hdr->caplen < offset) 1361 return; 1362 uhdr->s.iso.numdesc = SWAPLONG(uhdr->s.iso.numdesc); 1363 } else 1364 offset += 8; /* skip USB setup header */ 1365 1366 /* 1367 * With the old header, there are no isochronous descriptors 1368 * after the header. 1369 * 1370 * With the new header, the actual number of descriptors in 1371 * the header is not s.iso.numdesc, it's ndesc - only the 1372 * first N descriptors, for some value of N, are put into 1373 * the header, and ndesc is set to the actual number copied. 1374 * In addition, if s.iso.numdesc is negative, no descriptors 1375 * are captured, and ndesc is set to 0. 1376 */ 1377 if (header_len_64_bytes) { 1378 /* 1379 * This is either the "version 1" header, with 1380 * 16 bytes of additional fields at the end, or 1381 * a "version 0" header from a memory-mapped 1382 * capture, with 16 bytes of zeroed-out padding 1383 * at the end. Byte swap them as if this were 1384 * a "version 1" header. 1385 */ 1386 offset += 4; /* skip past interval */ 1387 if (hdr->caplen < offset) 1388 return; 1389 uhdr->interval = SWAPLONG(uhdr->interval); 1390 1391 offset += 4; /* skip past start_frame */ 1392 if (hdr->caplen < offset) 1393 return; 1394 uhdr->start_frame = SWAPLONG(uhdr->start_frame); 1395 1396 offset += 4; /* skip past xfer_flags */ 1397 if (hdr->caplen < offset) 1398 return; 1399 uhdr->xfer_flags = SWAPLONG(uhdr->xfer_flags); 1400 1401 offset += 4; /* skip past ndesc */ 1402 if (hdr->caplen < offset) 1403 return; 1404 uhdr->ndesc = SWAPLONG(uhdr->ndesc); 1405 1406 if (uhdr->transfer_type == URB_ISOCHRONOUS) { 1407 /* swap the values in struct linux_usb_isodesc */ 1408 usb_isodesc *pisodesc; 1409 uint32_t i; 1410 1411 pisodesc = (usb_isodesc *)(void *)(buf+offset); 1412 for (i = 0; i < uhdr->ndesc; i++) { 1413 offset += 4; /* skip past status */ 1414 if (hdr->caplen < offset) 1415 return; 1416 pisodesc->status = SWAPLONG(pisodesc->status); 1417 1418 offset += 4; /* skip past offset */ 1419 if (hdr->caplen < offset) 1420 return; 1421 pisodesc->offset = SWAPLONG(pisodesc->offset); 1422 1423 offset += 4; /* skip past len */ 1424 if (hdr->caplen < offset) 1425 return; 1426 pisodesc->len = SWAPLONG(pisodesc->len); 1427 1428 offset += 4; /* skip past padding */ 1429 1430 pisodesc++; 1431 } 1432 } 1433 } 1434 } 1435 1436 /* 1437 * The DLT_NFLOG "packets" have a mixture of big-endian and host-byte-order 1438 * data. They begin with a fixed-length header with big-endian fields, 1439 * followed by a set of TLVs, where the type and length are in host 1440 * byte order but the values are either big-endian or are a raw byte 1441 * sequence that's the same regardless of the host's byte order. 1442 * 1443 * When reading a DLT_NFLOG capture file, we need to convert the type 1444 * and length values from the byte order of the host that wrote the 1445 * file to the byte order of this host. 1446 */ 1447 static void 1448 swap_nflog_header(const struct pcap_pkthdr *hdr, u_char *buf) 1449 { 1450 u_char *p = buf; 1451 nflog_hdr_t *nfhdr = (nflog_hdr_t *)buf; 1452 nflog_tlv_t *tlv; 1453 u_int caplen = hdr->caplen; 1454 u_int length = hdr->len; 1455 uint16_t size; 1456 1457 if (caplen < (u_int) sizeof(nflog_hdr_t) || 1458 length < (u_int) sizeof(nflog_hdr_t)) { 1459 /* Not enough data to have any TLVs. */ 1460 return; 1461 } 1462 1463 if (nfhdr->nflog_version != 0) { 1464 /* Unknown NFLOG version */ 1465 return; 1466 } 1467 1468 length -= sizeof(nflog_hdr_t); 1469 caplen -= sizeof(nflog_hdr_t); 1470 p += sizeof(nflog_hdr_t); 1471 1472 while (caplen >= sizeof(nflog_tlv_t)) { 1473 tlv = (nflog_tlv_t *) p; 1474 1475 /* Swap the type and length. */ 1476 tlv->tlv_type = SWAPSHORT(tlv->tlv_type); 1477 tlv->tlv_length = SWAPSHORT(tlv->tlv_length); 1478 1479 /* Get the length of the TLV. */ 1480 size = tlv->tlv_length; 1481 if (size % 4 != 0) 1482 size += 4 - size % 4; 1483 1484 /* Is the TLV's length less than the minimum? */ 1485 if (size < sizeof(nflog_tlv_t)) { 1486 /* Yes. Give up now. */ 1487 return; 1488 } 1489 1490 /* Do we have enough data for the full TLV? */ 1491 if (caplen < size || length < size) { 1492 /* No. */ 1493 return; 1494 } 1495 1496 /* Skip over the TLV. */ 1497 length -= size; 1498 caplen -= size; 1499 p += size; 1500 } 1501 } 1502 1503 void 1504 swap_pseudo_headers(int linktype, struct pcap_pkthdr *hdr, u_char *data) 1505 { 1506 /* 1507 * Convert pseudo-headers from the byte order of 1508 * the host on which the file was saved to our 1509 * byte order, as necessary. 1510 */ 1511 switch (linktype) { 1512 1513 case DLT_LINUX_SLL: 1514 swap_linux_sll_header(hdr, data); 1515 break; 1516 1517 case DLT_USB_LINUX: 1518 swap_linux_usb_header(hdr, data, 0); 1519 break; 1520 1521 case DLT_USB_LINUX_MMAPPED: 1522 swap_linux_usb_header(hdr, data, 1); 1523 break; 1524 1525 case DLT_NFLOG: 1526 swap_nflog_header(hdr, data); 1527 break; 1528 } 1529 } 1530